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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux Socket Filter - Kernel level socket filtering | |
3 | * | |
bd4cf0ed AS |
4 | * Based on the design of the Berkeley Packet Filter. The new |
5 | * internal format has been designed by PLUMgrid: | |
1da177e4 | 6 | * |
bd4cf0ed AS |
7 | * Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com |
8 | * | |
9 | * Authors: | |
10 | * | |
11 | * Jay Schulist <jschlst@samba.org> | |
12 | * Alexei Starovoitov <ast@plumgrid.com> | |
13 | * Daniel Borkmann <dborkman@redhat.com> | |
1da177e4 LT |
14 | * |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License | |
17 | * as published by the Free Software Foundation; either version | |
18 | * 2 of the License, or (at your option) any later version. | |
19 | * | |
20 | * Andi Kleen - Fix a few bad bugs and races. | |
4df95ff4 | 21 | * Kris Katterjohn - Added many additional checks in bpf_check_classic() |
1da177e4 LT |
22 | */ |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/types.h> | |
1da177e4 LT |
26 | #include <linux/mm.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/socket.h> | |
91b8270f | 29 | #include <linux/sock_diag.h> |
1da177e4 LT |
30 | #include <linux/in.h> |
31 | #include <linux/inet.h> | |
32 | #include <linux/netdevice.h> | |
33 | #include <linux/if_packet.h> | |
c491680f | 34 | #include <linux/if_arp.h> |
5a0e3ad6 | 35 | #include <linux/gfp.h> |
d74bad4e | 36 | #include <net/inet_common.h> |
1da177e4 LT |
37 | #include <net/ip.h> |
38 | #include <net/protocol.h> | |
4738c1db | 39 | #include <net/netlink.h> |
1da177e4 | 40 | #include <linux/skbuff.h> |
604326b4 | 41 | #include <linux/skmsg.h> |
1da177e4 | 42 | #include <net/sock.h> |
10b89ee4 | 43 | #include <net/flow_dissector.h> |
1da177e4 LT |
44 | #include <linux/errno.h> |
45 | #include <linux/timer.h> | |
7c0f6ba6 | 46 | #include <linux/uaccess.h> |
40daafc8 | 47 | #include <asm/unaligned.h> |
d66f2b91 | 48 | #include <asm/cmpxchg.h> |
1da177e4 | 49 | #include <linux/filter.h> |
86e4ca66 | 50 | #include <linux/ratelimit.h> |
46b325c7 | 51 | #include <linux/seccomp.h> |
f3335031 | 52 | #include <linux/if_vlan.h> |
89aa0758 | 53 | #include <linux/bpf.h> |
d691f9e8 | 54 | #include <net/sch_generic.h> |
8d20aabe | 55 | #include <net/cls_cgroup.h> |
d3aa45ce | 56 | #include <net/dst_metadata.h> |
c46646d0 | 57 | #include <net/dst.h> |
538950a1 | 58 | #include <net/sock_reuseport.h> |
b1d9fc41 | 59 | #include <net/busy_poll.h> |
8c4b4c7e | 60 | #include <net/tcp.h> |
12bed760 | 61 | #include <net/xfrm.h> |
6acc9b43 | 62 | #include <net/udp.h> |
5acaee0a | 63 | #include <linux/bpf_trace.h> |
02671e23 | 64 | #include <net/xdp_sock.h> |
87f5fc7e | 65 | #include <linux/inetdevice.h> |
6acc9b43 JS |
66 | #include <net/inet_hashtables.h> |
67 | #include <net/inet6_hashtables.h> | |
87f5fc7e DA |
68 | #include <net/ip_fib.h> |
69 | #include <net/flow.h> | |
70 | #include <net/arp.h> | |
fe94cc29 | 71 | #include <net/ipv6.h> |
6acc9b43 | 72 | #include <net/net_namespace.h> |
fe94cc29 MX |
73 | #include <linux/seg6_local.h> |
74 | #include <net/seg6.h> | |
75 | #include <net/seg6_local.h> | |
1da177e4 | 76 | |
43db6d65 | 77 | /** |
f4979fce | 78 | * sk_filter_trim_cap - run a packet through a socket filter |
43db6d65 SH |
79 | * @sk: sock associated with &sk_buff |
80 | * @skb: buffer to filter | |
f4979fce | 81 | * @cap: limit on how short the eBPF program may trim the packet |
43db6d65 | 82 | * |
ff936a04 AS |
83 | * Run the eBPF program and then cut skb->data to correct size returned by |
84 | * the program. If pkt_len is 0 we toss packet. If skb->len is smaller | |
43db6d65 | 85 | * than pkt_len we keep whole skb->data. This is the socket level |
ff936a04 | 86 | * wrapper to BPF_PROG_RUN. It returns 0 if the packet should |
43db6d65 SH |
87 | * be accepted or -EPERM if the packet should be tossed. |
88 | * | |
89 | */ | |
f4979fce | 90 | int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) |
43db6d65 SH |
91 | { |
92 | int err; | |
93 | struct sk_filter *filter; | |
94 | ||
c93bdd0e MG |
95 | /* |
96 | * If the skb was allocated from pfmemalloc reserves, only | |
97 | * allow SOCK_MEMALLOC sockets to use it as this socket is | |
98 | * helping free memory | |
99 | */ | |
8fe809a9 ED |
100 | if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) { |
101 | NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP); | |
c93bdd0e | 102 | return -ENOMEM; |
8fe809a9 | 103 | } |
c11cd3a6 DM |
104 | err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); |
105 | if (err) | |
106 | return err; | |
107 | ||
43db6d65 SH |
108 | err = security_sock_rcv_skb(sk, skb); |
109 | if (err) | |
110 | return err; | |
111 | ||
80f8f102 ED |
112 | rcu_read_lock(); |
113 | filter = rcu_dereference(sk->sk_filter); | |
43db6d65 | 114 | if (filter) { |
8f917bba WB |
115 | struct sock *save_sk = skb->sk; |
116 | unsigned int pkt_len; | |
117 | ||
118 | skb->sk = sk; | |
119 | pkt_len = bpf_prog_run_save_cb(filter->prog, skb); | |
8f917bba | 120 | skb->sk = save_sk; |
d1f496fd | 121 | err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM; |
43db6d65 | 122 | } |
80f8f102 | 123 | rcu_read_unlock(); |
43db6d65 SH |
124 | |
125 | return err; | |
126 | } | |
f4979fce | 127 | EXPORT_SYMBOL(sk_filter_trim_cap); |
43db6d65 | 128 | |
b390134c | 129 | BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb) |
bd4cf0ed | 130 | { |
f3694e00 | 131 | return skb_get_poff(skb); |
bd4cf0ed AS |
132 | } |
133 | ||
b390134c | 134 | BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x) |
bd4cf0ed | 135 | { |
bd4cf0ed AS |
136 | struct nlattr *nla; |
137 | ||
138 | if (skb_is_nonlinear(skb)) | |
139 | return 0; | |
140 | ||
05ab8f26 MK |
141 | if (skb->len < sizeof(struct nlattr)) |
142 | return 0; | |
143 | ||
30743837 | 144 | if (a > skb->len - sizeof(struct nlattr)) |
bd4cf0ed AS |
145 | return 0; |
146 | ||
30743837 | 147 | nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x); |
bd4cf0ed AS |
148 | if (nla) |
149 | return (void *) nla - (void *) skb->data; | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
b390134c | 154 | BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x) |
bd4cf0ed | 155 | { |
bd4cf0ed AS |
156 | struct nlattr *nla; |
157 | ||
158 | if (skb_is_nonlinear(skb)) | |
159 | return 0; | |
160 | ||
05ab8f26 MK |
161 | if (skb->len < sizeof(struct nlattr)) |
162 | return 0; | |
163 | ||
30743837 | 164 | if (a > skb->len - sizeof(struct nlattr)) |
bd4cf0ed AS |
165 | return 0; |
166 | ||
30743837 DB |
167 | nla = (struct nlattr *) &skb->data[a]; |
168 | if (nla->nla_len > skb->len - a) | |
bd4cf0ed AS |
169 | return 0; |
170 | ||
30743837 | 171 | nla = nla_find_nested(nla, x); |
bd4cf0ed AS |
172 | if (nla) |
173 | return (void *) nla - (void *) skb->data; | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
e0cea7ce DB |
178 | BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *, |
179 | data, int, headlen, int, offset) | |
180 | { | |
181 | u8 tmp, *ptr; | |
182 | const int len = sizeof(tmp); | |
183 | ||
184 | if (offset >= 0) { | |
185 | if (headlen - offset >= len) | |
186 | return *(u8 *)(data + offset); | |
187 | if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) | |
188 | return tmp; | |
189 | } else { | |
190 | ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); | |
191 | if (likely(ptr)) | |
192 | return *(u8 *)ptr; | |
193 | } | |
194 | ||
195 | return -EFAULT; | |
196 | } | |
197 | ||
198 | BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb, | |
199 | int, offset) | |
200 | { | |
201 | return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len, | |
202 | offset); | |
203 | } | |
204 | ||
205 | BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *, | |
206 | data, int, headlen, int, offset) | |
207 | { | |
208 | u16 tmp, *ptr; | |
209 | const int len = sizeof(tmp); | |
210 | ||
211 | if (offset >= 0) { | |
212 | if (headlen - offset >= len) | |
213 | return get_unaligned_be16(data + offset); | |
214 | if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) | |
215 | return be16_to_cpu(tmp); | |
216 | } else { | |
217 | ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); | |
218 | if (likely(ptr)) | |
219 | return get_unaligned_be16(ptr); | |
220 | } | |
221 | ||
222 | return -EFAULT; | |
223 | } | |
224 | ||
225 | BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb, | |
226 | int, offset) | |
227 | { | |
228 | return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len, | |
229 | offset); | |
230 | } | |
231 | ||
232 | BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *, | |
233 | data, int, headlen, int, offset) | |
234 | { | |
235 | u32 tmp, *ptr; | |
236 | const int len = sizeof(tmp); | |
237 | ||
238 | if (likely(offset >= 0)) { | |
239 | if (headlen - offset >= len) | |
240 | return get_unaligned_be32(data + offset); | |
241 | if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) | |
242 | return be32_to_cpu(tmp); | |
243 | } else { | |
244 | ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); | |
245 | if (likely(ptr)) | |
246 | return get_unaligned_be32(ptr); | |
247 | } | |
248 | ||
249 | return -EFAULT; | |
250 | } | |
251 | ||
252 | BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb, | |
253 | int, offset) | |
254 | { | |
255 | return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len, | |
256 | offset); | |
257 | } | |
258 | ||
b390134c | 259 | BPF_CALL_0(bpf_get_raw_cpu_id) |
bd4cf0ed AS |
260 | { |
261 | return raw_smp_processor_id(); | |
262 | } | |
263 | ||
80b48c44 | 264 | static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = { |
b390134c | 265 | .func = bpf_get_raw_cpu_id, |
80b48c44 DB |
266 | .gpl_only = false, |
267 | .ret_type = RET_INTEGER, | |
268 | }; | |
269 | ||
9bac3d6d AS |
270 | static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg, |
271 | struct bpf_insn *insn_buf) | |
272 | { | |
273 | struct bpf_insn *insn = insn_buf; | |
274 | ||
275 | switch (skb_field) { | |
276 | case SKF_AD_MARK: | |
277 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, mark) != 4); | |
278 | ||
279 | *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, | |
280 | offsetof(struct sk_buff, mark)); | |
281 | break; | |
282 | ||
283 | case SKF_AD_PKTTYPE: | |
284 | *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET()); | |
285 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX); | |
286 | #ifdef __BIG_ENDIAN_BITFIELD | |
287 | *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5); | |
288 | #endif | |
289 | break; | |
290 | ||
291 | case SKF_AD_QUEUE: | |
292 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, queue_mapping) != 2); | |
293 | ||
294 | *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, | |
295 | offsetof(struct sk_buff, queue_mapping)); | |
296 | break; | |
c2497395 | 297 | |
c2497395 | 298 | case SKF_AD_VLAN_TAG: |
c2497395 | 299 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2); |
c2497395 AS |
300 | |
301 | /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */ | |
302 | *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, | |
303 | offsetof(struct sk_buff, vlan_tci)); | |
9c212255 MM |
304 | break; |
305 | case SKF_AD_VLAN_TAG_PRESENT: | |
306 | *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_VLAN_PRESENT_OFFSET()); | |
307 | if (PKT_VLAN_PRESENT_BIT) | |
308 | *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, PKT_VLAN_PRESENT_BIT); | |
309 | if (PKT_VLAN_PRESENT_BIT < 7) | |
c2497395 | 310 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1); |
c2497395 | 311 | break; |
9bac3d6d AS |
312 | } |
313 | ||
314 | return insn - insn_buf; | |
315 | } | |
316 | ||
bd4cf0ed | 317 | static bool convert_bpf_extensions(struct sock_filter *fp, |
2695fb55 | 318 | struct bpf_insn **insnp) |
bd4cf0ed | 319 | { |
2695fb55 | 320 | struct bpf_insn *insn = *insnp; |
9bac3d6d | 321 | u32 cnt; |
bd4cf0ed AS |
322 | |
323 | switch (fp->k) { | |
324 | case SKF_AD_OFF + SKF_AD_PROTOCOL: | |
0b8c707d DB |
325 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, protocol) != 2); |
326 | ||
327 | /* A = *(u16 *) (CTX + offsetof(protocol)) */ | |
328 | *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, | |
329 | offsetof(struct sk_buff, protocol)); | |
330 | /* A = ntohs(A) [emitting a nop or swap16] */ | |
331 | *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); | |
bd4cf0ed AS |
332 | break; |
333 | ||
334 | case SKF_AD_OFF + SKF_AD_PKTTYPE: | |
9bac3d6d AS |
335 | cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn); |
336 | insn += cnt - 1; | |
bd4cf0ed AS |
337 | break; |
338 | ||
339 | case SKF_AD_OFF + SKF_AD_IFINDEX: | |
340 | case SKF_AD_OFF + SKF_AD_HATYPE: | |
bd4cf0ed AS |
341 | BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, ifindex) != 4); |
342 | BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, type) != 2); | |
f8f6d679 | 343 | |
f035a515 | 344 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
f8f6d679 DB |
345 | BPF_REG_TMP, BPF_REG_CTX, |
346 | offsetof(struct sk_buff, dev)); | |
347 | /* if (tmp != 0) goto pc + 1 */ | |
348 | *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1); | |
349 | *insn++ = BPF_EXIT_INSN(); | |
350 | if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX) | |
351 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP, | |
352 | offsetof(struct net_device, ifindex)); | |
353 | else | |
354 | *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP, | |
355 | offsetof(struct net_device, type)); | |
bd4cf0ed AS |
356 | break; |
357 | ||
358 | case SKF_AD_OFF + SKF_AD_MARK: | |
9bac3d6d AS |
359 | cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn); |
360 | insn += cnt - 1; | |
bd4cf0ed AS |
361 | break; |
362 | ||
363 | case SKF_AD_OFF + SKF_AD_RXHASH: | |
364 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, hash) != 4); | |
365 | ||
9739eef1 AS |
366 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, |
367 | offsetof(struct sk_buff, hash)); | |
bd4cf0ed AS |
368 | break; |
369 | ||
370 | case SKF_AD_OFF + SKF_AD_QUEUE: | |
9bac3d6d AS |
371 | cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn); |
372 | insn += cnt - 1; | |
bd4cf0ed AS |
373 | break; |
374 | ||
375 | case SKF_AD_OFF + SKF_AD_VLAN_TAG: | |
c2497395 AS |
376 | cnt = convert_skb_access(SKF_AD_VLAN_TAG, |
377 | BPF_REG_A, BPF_REG_CTX, insn); | |
378 | insn += cnt - 1; | |
379 | break; | |
bd4cf0ed | 380 | |
c2497395 AS |
381 | case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT: |
382 | cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT, | |
383 | BPF_REG_A, BPF_REG_CTX, insn); | |
384 | insn += cnt - 1; | |
bd4cf0ed AS |
385 | break; |
386 | ||
27cd5452 MS |
387 | case SKF_AD_OFF + SKF_AD_VLAN_TPID: |
388 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_proto) != 2); | |
389 | ||
390 | /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */ | |
391 | *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, | |
392 | offsetof(struct sk_buff, vlan_proto)); | |
393 | /* A = ntohs(A) [emitting a nop or swap16] */ | |
394 | *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); | |
395 | break; | |
396 | ||
bd4cf0ed AS |
397 | case SKF_AD_OFF + SKF_AD_PAY_OFFSET: |
398 | case SKF_AD_OFF + SKF_AD_NLATTR: | |
399 | case SKF_AD_OFF + SKF_AD_NLATTR_NEST: | |
400 | case SKF_AD_OFF + SKF_AD_CPU: | |
4cd3675e | 401 | case SKF_AD_OFF + SKF_AD_RANDOM: |
e430f34e | 402 | /* arg1 = CTX */ |
f8f6d679 | 403 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); |
bd4cf0ed | 404 | /* arg2 = A */ |
f8f6d679 | 405 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A); |
bd4cf0ed | 406 | /* arg3 = X */ |
f8f6d679 | 407 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X); |
e430f34e | 408 | /* Emit call(arg1=CTX, arg2=A, arg3=X) */ |
bd4cf0ed AS |
409 | switch (fp->k) { |
410 | case SKF_AD_OFF + SKF_AD_PAY_OFFSET: | |
b390134c | 411 | *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset); |
bd4cf0ed AS |
412 | break; |
413 | case SKF_AD_OFF + SKF_AD_NLATTR: | |
b390134c | 414 | *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr); |
bd4cf0ed AS |
415 | break; |
416 | case SKF_AD_OFF + SKF_AD_NLATTR_NEST: | |
b390134c | 417 | *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest); |
bd4cf0ed AS |
418 | break; |
419 | case SKF_AD_OFF + SKF_AD_CPU: | |
b390134c | 420 | *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id); |
bd4cf0ed | 421 | break; |
4cd3675e | 422 | case SKF_AD_OFF + SKF_AD_RANDOM: |
3ad00405 DB |
423 | *insn = BPF_EMIT_CALL(bpf_user_rnd_u32); |
424 | bpf_user_rnd_init_once(); | |
4cd3675e | 425 | break; |
bd4cf0ed AS |
426 | } |
427 | break; | |
428 | ||
429 | case SKF_AD_OFF + SKF_AD_ALU_XOR_X: | |
9739eef1 AS |
430 | /* A ^= X */ |
431 | *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X); | |
bd4cf0ed AS |
432 | break; |
433 | ||
434 | default: | |
435 | /* This is just a dummy call to avoid letting the compiler | |
436 | * evict __bpf_call_base() as an optimization. Placed here | |
437 | * where no-one bothers. | |
438 | */ | |
439 | BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0); | |
440 | return false; | |
441 | } | |
442 | ||
443 | *insnp = insn; | |
444 | return true; | |
445 | } | |
446 | ||
e0cea7ce DB |
447 | static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp) |
448 | { | |
449 | const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS); | |
450 | int size = bpf_size_to_bytes(BPF_SIZE(fp->code)); | |
451 | bool endian = BPF_SIZE(fp->code) == BPF_H || | |
452 | BPF_SIZE(fp->code) == BPF_W; | |
453 | bool indirect = BPF_MODE(fp->code) == BPF_IND; | |
454 | const int ip_align = NET_IP_ALIGN; | |
455 | struct bpf_insn *insn = *insnp; | |
456 | int offset = fp->k; | |
457 | ||
458 | if (!indirect && | |
459 | ((unaligned_ok && offset >= 0) || | |
460 | (!unaligned_ok && offset >= 0 && | |
461 | offset + ip_align >= 0 && | |
462 | offset + ip_align % size == 0))) { | |
59ee4129 DB |
463 | bool ldx_off_ok = offset <= S16_MAX; |
464 | ||
e0cea7ce | 465 | *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H); |
d8f3e978 DM |
466 | if (offset) |
467 | *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset); | |
59ee4129 DB |
468 | *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP, |
469 | size, 2 + endian + (!ldx_off_ok * 2)); | |
470 | if (ldx_off_ok) { | |
471 | *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, | |
472 | BPF_REG_D, offset); | |
473 | } else { | |
474 | *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D); | |
475 | *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset); | |
476 | *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, | |
477 | BPF_REG_TMP, 0); | |
478 | } | |
e0cea7ce DB |
479 | if (endian) |
480 | *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8); | |
481 | *insn++ = BPF_JMP_A(8); | |
482 | } | |
483 | ||
484 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); | |
485 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D); | |
486 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H); | |
487 | if (!indirect) { | |
488 | *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset); | |
489 | } else { | |
490 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X); | |
491 | if (fp->k) | |
492 | *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset); | |
493 | } | |
494 | ||
495 | switch (BPF_SIZE(fp->code)) { | |
496 | case BPF_B: | |
497 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8); | |
498 | break; | |
499 | case BPF_H: | |
500 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16); | |
501 | break; | |
502 | case BPF_W: | |
503 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32); | |
504 | break; | |
505 | default: | |
506 | return false; | |
507 | } | |
508 | ||
509 | *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2); | |
510 | *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); | |
511 | *insn = BPF_EXIT_INSN(); | |
512 | ||
513 | *insnp = insn; | |
514 | return true; | |
515 | } | |
516 | ||
bd4cf0ed | 517 | /** |
8fb575ca | 518 | * bpf_convert_filter - convert filter program |
bd4cf0ed AS |
519 | * @prog: the user passed filter program |
520 | * @len: the length of the user passed filter program | |
50bbfed9 | 521 | * @new_prog: allocated 'struct bpf_prog' or NULL |
bd4cf0ed | 522 | * @new_len: pointer to store length of converted program |
e0cea7ce | 523 | * @seen_ld_abs: bool whether we've seen ld_abs/ind |
bd4cf0ed | 524 | * |
1f504ec9 TK |
525 | * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn' |
526 | * style extended BPF (eBPF). | |
bd4cf0ed AS |
527 | * Conversion workflow: |
528 | * | |
529 | * 1) First pass for calculating the new program length: | |
e0cea7ce | 530 | * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs) |
bd4cf0ed AS |
531 | * |
532 | * 2) 2nd pass to remap in two passes: 1st pass finds new | |
533 | * jump offsets, 2nd pass remapping: | |
e0cea7ce | 534 | * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs) |
bd4cf0ed | 535 | */ |
d9e12f42 | 536 | static int bpf_convert_filter(struct sock_filter *prog, int len, |
e0cea7ce DB |
537 | struct bpf_prog *new_prog, int *new_len, |
538 | bool *seen_ld_abs) | |
bd4cf0ed | 539 | { |
50bbfed9 AS |
540 | int new_flen = 0, pass = 0, target, i, stack_off; |
541 | struct bpf_insn *new_insn, *first_insn = NULL; | |
bd4cf0ed AS |
542 | struct sock_filter *fp; |
543 | int *addrs = NULL; | |
544 | u8 bpf_src; | |
545 | ||
546 | BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); | |
30743837 | 547 | BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); |
bd4cf0ed | 548 | |
6f9a093b | 549 | if (len <= 0 || len > BPF_MAXINSNS) |
bd4cf0ed AS |
550 | return -EINVAL; |
551 | ||
552 | if (new_prog) { | |
50bbfed9 | 553 | first_insn = new_prog->insnsi; |
658da937 DB |
554 | addrs = kcalloc(len, sizeof(*addrs), |
555 | GFP_KERNEL | __GFP_NOWARN); | |
bd4cf0ed AS |
556 | if (!addrs) |
557 | return -ENOMEM; | |
558 | } | |
559 | ||
560 | do_pass: | |
50bbfed9 | 561 | new_insn = first_insn; |
bd4cf0ed AS |
562 | fp = prog; |
563 | ||
8b614aeb | 564 | /* Classic BPF related prologue emission. */ |
50bbfed9 | 565 | if (new_prog) { |
8b614aeb DB |
566 | /* Classic BPF expects A and X to be reset first. These need |
567 | * to be guaranteed to be the first two instructions. | |
568 | */ | |
1d621674 DB |
569 | *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); |
570 | *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X); | |
8b614aeb DB |
571 | |
572 | /* All programs must keep CTX in callee saved BPF_REG_CTX. | |
573 | * In eBPF case it's done by the compiler, here we need to | |
574 | * do this ourself. Initial CTX is present in BPF_REG_ARG1. | |
575 | */ | |
576 | *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1); | |
e0cea7ce DB |
577 | if (*seen_ld_abs) { |
578 | /* For packet access in classic BPF, cache skb->data | |
579 | * in callee-saved BPF R8 and skb->len - skb->data_len | |
580 | * (headlen) in BPF R9. Since classic BPF is read-only | |
581 | * on CTX, we only need to cache it once. | |
582 | */ | |
583 | *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), | |
584 | BPF_REG_D, BPF_REG_CTX, | |
585 | offsetof(struct sk_buff, data)); | |
586 | *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX, | |
587 | offsetof(struct sk_buff, len)); | |
588 | *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX, | |
589 | offsetof(struct sk_buff, data_len)); | |
590 | *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP); | |
591 | } | |
8b614aeb DB |
592 | } else { |
593 | new_insn += 3; | |
594 | } | |
bd4cf0ed AS |
595 | |
596 | for (i = 0; i < len; fp++, i++) { | |
e0cea7ce | 597 | struct bpf_insn tmp_insns[32] = { }; |
2695fb55 | 598 | struct bpf_insn *insn = tmp_insns; |
bd4cf0ed AS |
599 | |
600 | if (addrs) | |
50bbfed9 | 601 | addrs[i] = new_insn - first_insn; |
bd4cf0ed AS |
602 | |
603 | switch (fp->code) { | |
604 | /* All arithmetic insns and skb loads map as-is. */ | |
605 | case BPF_ALU | BPF_ADD | BPF_X: | |
606 | case BPF_ALU | BPF_ADD | BPF_K: | |
607 | case BPF_ALU | BPF_SUB | BPF_X: | |
608 | case BPF_ALU | BPF_SUB | BPF_K: | |
609 | case BPF_ALU | BPF_AND | BPF_X: | |
610 | case BPF_ALU | BPF_AND | BPF_K: | |
611 | case BPF_ALU | BPF_OR | BPF_X: | |
612 | case BPF_ALU | BPF_OR | BPF_K: | |
613 | case BPF_ALU | BPF_LSH | BPF_X: | |
614 | case BPF_ALU | BPF_LSH | BPF_K: | |
615 | case BPF_ALU | BPF_RSH | BPF_X: | |
616 | case BPF_ALU | BPF_RSH | BPF_K: | |
617 | case BPF_ALU | BPF_XOR | BPF_X: | |
618 | case BPF_ALU | BPF_XOR | BPF_K: | |
619 | case BPF_ALU | BPF_MUL | BPF_X: | |
620 | case BPF_ALU | BPF_MUL | BPF_K: | |
621 | case BPF_ALU | BPF_DIV | BPF_X: | |
622 | case BPF_ALU | BPF_DIV | BPF_K: | |
623 | case BPF_ALU | BPF_MOD | BPF_X: | |
624 | case BPF_ALU | BPF_MOD | BPF_K: | |
625 | case BPF_ALU | BPF_NEG: | |
626 | case BPF_LD | BPF_ABS | BPF_W: | |
627 | case BPF_LD | BPF_ABS | BPF_H: | |
628 | case BPF_LD | BPF_ABS | BPF_B: | |
629 | case BPF_LD | BPF_IND | BPF_W: | |
630 | case BPF_LD | BPF_IND | BPF_H: | |
631 | case BPF_LD | BPF_IND | BPF_B: | |
632 | /* Check for overloaded BPF extension and | |
633 | * directly convert it if found, otherwise | |
634 | * just move on with mapping. | |
635 | */ | |
636 | if (BPF_CLASS(fp->code) == BPF_LD && | |
637 | BPF_MODE(fp->code) == BPF_ABS && | |
638 | convert_bpf_extensions(fp, &insn)) | |
639 | break; | |
e0cea7ce DB |
640 | if (BPF_CLASS(fp->code) == BPF_LD && |
641 | convert_bpf_ld_abs(fp, &insn)) { | |
642 | *seen_ld_abs = true; | |
643 | break; | |
644 | } | |
bd4cf0ed | 645 | |
68fda450 | 646 | if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) || |
f6b1b3bf | 647 | fp->code == (BPF_ALU | BPF_MOD | BPF_X)) { |
68fda450 | 648 | *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X); |
f6b1b3bf DB |
649 | /* Error with exception code on div/mod by 0. |
650 | * For cBPF programs, this was always return 0. | |
651 | */ | |
652 | *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2); | |
653 | *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); | |
654 | *insn++ = BPF_EXIT_INSN(); | |
655 | } | |
68fda450 | 656 | |
f8f6d679 | 657 | *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k); |
bd4cf0ed AS |
658 | break; |
659 | ||
f8f6d679 DB |
660 | /* Jump transformation cannot use BPF block macros |
661 | * everywhere as offset calculation and target updates | |
662 | * require a bit more work than the rest, i.e. jump | |
663 | * opcodes map as-is, but offsets need adjustment. | |
664 | */ | |
665 | ||
666 | #define BPF_EMIT_JMP \ | |
bd4cf0ed | 667 | do { \ |
050fad7c DB |
668 | const s32 off_min = S16_MIN, off_max = S16_MAX; \ |
669 | s32 off; \ | |
670 | \ | |
bd4cf0ed AS |
671 | if (target >= len || target < 0) \ |
672 | goto err; \ | |
050fad7c | 673 | off = addrs ? addrs[target] - addrs[i] - 1 : 0; \ |
bd4cf0ed | 674 | /* Adjust pc relative offset for 2nd or 3rd insn. */ \ |
050fad7c DB |
675 | off -= insn - tmp_insns; \ |
676 | /* Reject anything not fitting into insn->off. */ \ | |
677 | if (off < off_min || off > off_max) \ | |
678 | goto err; \ | |
679 | insn->off = off; \ | |
bd4cf0ed AS |
680 | } while (0) |
681 | ||
f8f6d679 DB |
682 | case BPF_JMP | BPF_JA: |
683 | target = i + fp->k + 1; | |
684 | insn->code = fp->code; | |
685 | BPF_EMIT_JMP; | |
bd4cf0ed AS |
686 | break; |
687 | ||
688 | case BPF_JMP | BPF_JEQ | BPF_K: | |
689 | case BPF_JMP | BPF_JEQ | BPF_X: | |
690 | case BPF_JMP | BPF_JSET | BPF_K: | |
691 | case BPF_JMP | BPF_JSET | BPF_X: | |
692 | case BPF_JMP | BPF_JGT | BPF_K: | |
693 | case BPF_JMP | BPF_JGT | BPF_X: | |
694 | case BPF_JMP | BPF_JGE | BPF_K: | |
695 | case BPF_JMP | BPF_JGE | BPF_X: | |
696 | if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) { | |
697 | /* BPF immediates are signed, zero extend | |
698 | * immediate into tmp register and use it | |
699 | * in compare insn. | |
700 | */ | |
f8f6d679 | 701 | *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k); |
bd4cf0ed | 702 | |
e430f34e AS |
703 | insn->dst_reg = BPF_REG_A; |
704 | insn->src_reg = BPF_REG_TMP; | |
bd4cf0ed AS |
705 | bpf_src = BPF_X; |
706 | } else { | |
e430f34e | 707 | insn->dst_reg = BPF_REG_A; |
bd4cf0ed AS |
708 | insn->imm = fp->k; |
709 | bpf_src = BPF_SRC(fp->code); | |
19539ce7 | 710 | insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0; |
1da177e4 | 711 | } |
bd4cf0ed AS |
712 | |
713 | /* Common case where 'jump_false' is next insn. */ | |
714 | if (fp->jf == 0) { | |
715 | insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; | |
716 | target = i + fp->jt + 1; | |
f8f6d679 | 717 | BPF_EMIT_JMP; |
bd4cf0ed | 718 | break; |
1da177e4 | 719 | } |
bd4cf0ed | 720 | |
92b31a9a DB |
721 | /* Convert some jumps when 'jump_true' is next insn. */ |
722 | if (fp->jt == 0) { | |
723 | switch (BPF_OP(fp->code)) { | |
724 | case BPF_JEQ: | |
725 | insn->code = BPF_JMP | BPF_JNE | bpf_src; | |
726 | break; | |
727 | case BPF_JGT: | |
728 | insn->code = BPF_JMP | BPF_JLE | bpf_src; | |
729 | break; | |
730 | case BPF_JGE: | |
731 | insn->code = BPF_JMP | BPF_JLT | bpf_src; | |
732 | break; | |
733 | default: | |
734 | goto jmp_rest; | |
735 | } | |
736 | ||
bd4cf0ed | 737 | target = i + fp->jf + 1; |
f8f6d679 | 738 | BPF_EMIT_JMP; |
bd4cf0ed | 739 | break; |
0b05b2a4 | 740 | } |
92b31a9a | 741 | jmp_rest: |
bd4cf0ed AS |
742 | /* Other jumps are mapped into two insns: Jxx and JA. */ |
743 | target = i + fp->jt + 1; | |
744 | insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; | |
f8f6d679 | 745 | BPF_EMIT_JMP; |
bd4cf0ed AS |
746 | insn++; |
747 | ||
748 | insn->code = BPF_JMP | BPF_JA; | |
749 | target = i + fp->jf + 1; | |
f8f6d679 | 750 | BPF_EMIT_JMP; |
bd4cf0ed AS |
751 | break; |
752 | ||
753 | /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */ | |
e0cea7ce DB |
754 | case BPF_LDX | BPF_MSH | BPF_B: { |
755 | struct sock_filter tmp = { | |
756 | .code = BPF_LD | BPF_ABS | BPF_B, | |
757 | .k = fp->k, | |
758 | }; | |
759 | ||
760 | *seen_ld_abs = true; | |
761 | ||
762 | /* X = A */ | |
763 | *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); | |
1268e253 | 764 | /* A = BPF_R0 = *(u8 *) (skb->data + K) */ |
e0cea7ce DB |
765 | convert_bpf_ld_abs(&tmp, &insn); |
766 | insn++; | |
9739eef1 | 767 | /* A &= 0xf */ |
f8f6d679 | 768 | *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf); |
9739eef1 | 769 | /* A <<= 2 */ |
f8f6d679 | 770 | *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2); |
e0cea7ce DB |
771 | /* tmp = X */ |
772 | *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X); | |
9739eef1 | 773 | /* X = A */ |
f8f6d679 | 774 | *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
9739eef1 | 775 | /* A = tmp */ |
f8f6d679 | 776 | *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP); |
bd4cf0ed | 777 | break; |
e0cea7ce | 778 | } |
6205b9cf DB |
779 | /* RET_K is remaped into 2 insns. RET_A case doesn't need an |
780 | * extra mov as BPF_REG_0 is already mapped into BPF_REG_A. | |
781 | */ | |
bd4cf0ed AS |
782 | case BPF_RET | BPF_A: |
783 | case BPF_RET | BPF_K: | |
6205b9cf DB |
784 | if (BPF_RVAL(fp->code) == BPF_K) |
785 | *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0, | |
786 | 0, fp->k); | |
9739eef1 | 787 | *insn = BPF_EXIT_INSN(); |
bd4cf0ed AS |
788 | break; |
789 | ||
790 | /* Store to stack. */ | |
791 | case BPF_ST: | |
792 | case BPF_STX: | |
50bbfed9 | 793 | stack_off = fp->k * 4 + 4; |
f8f6d679 DB |
794 | *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) == |
795 | BPF_ST ? BPF_REG_A : BPF_REG_X, | |
50bbfed9 AS |
796 | -stack_off); |
797 | /* check_load_and_stores() verifies that classic BPF can | |
798 | * load from stack only after write, so tracking | |
799 | * stack_depth for ST|STX insns is enough | |
800 | */ | |
801 | if (new_prog && new_prog->aux->stack_depth < stack_off) | |
802 | new_prog->aux->stack_depth = stack_off; | |
bd4cf0ed AS |
803 | break; |
804 | ||
805 | /* Load from stack. */ | |
806 | case BPF_LD | BPF_MEM: | |
807 | case BPF_LDX | BPF_MEM: | |
50bbfed9 | 808 | stack_off = fp->k * 4 + 4; |
f8f6d679 DB |
809 | *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? |
810 | BPF_REG_A : BPF_REG_X, BPF_REG_FP, | |
50bbfed9 | 811 | -stack_off); |
bd4cf0ed AS |
812 | break; |
813 | ||
814 | /* A = K or X = K */ | |
815 | case BPF_LD | BPF_IMM: | |
816 | case BPF_LDX | BPF_IMM: | |
f8f6d679 DB |
817 | *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ? |
818 | BPF_REG_A : BPF_REG_X, fp->k); | |
bd4cf0ed AS |
819 | break; |
820 | ||
821 | /* X = A */ | |
822 | case BPF_MISC | BPF_TAX: | |
f8f6d679 | 823 | *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
bd4cf0ed AS |
824 | break; |
825 | ||
826 | /* A = X */ | |
827 | case BPF_MISC | BPF_TXA: | |
f8f6d679 | 828 | *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X); |
bd4cf0ed AS |
829 | break; |
830 | ||
831 | /* A = skb->len or X = skb->len */ | |
832 | case BPF_LD | BPF_W | BPF_LEN: | |
833 | case BPF_LDX | BPF_W | BPF_LEN: | |
f8f6d679 DB |
834 | *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? |
835 | BPF_REG_A : BPF_REG_X, BPF_REG_CTX, | |
836 | offsetof(struct sk_buff, len)); | |
bd4cf0ed AS |
837 | break; |
838 | ||
f8f6d679 | 839 | /* Access seccomp_data fields. */ |
bd4cf0ed | 840 | case BPF_LDX | BPF_ABS | BPF_W: |
9739eef1 AS |
841 | /* A = *(u32 *) (ctx + K) */ |
842 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); | |
bd4cf0ed AS |
843 | break; |
844 | ||
ca9f1fd2 | 845 | /* Unknown instruction. */ |
1da177e4 | 846 | default: |
bd4cf0ed | 847 | goto err; |
1da177e4 | 848 | } |
bd4cf0ed AS |
849 | |
850 | insn++; | |
851 | if (new_prog) | |
852 | memcpy(new_insn, tmp_insns, | |
853 | sizeof(*insn) * (insn - tmp_insns)); | |
bd4cf0ed | 854 | new_insn += insn - tmp_insns; |
1da177e4 LT |
855 | } |
856 | ||
bd4cf0ed AS |
857 | if (!new_prog) { |
858 | /* Only calculating new length. */ | |
50bbfed9 | 859 | *new_len = new_insn - first_insn; |
e0cea7ce DB |
860 | if (*seen_ld_abs) |
861 | *new_len += 4; /* Prologue bits. */ | |
bd4cf0ed AS |
862 | return 0; |
863 | } | |
864 | ||
865 | pass++; | |
50bbfed9 AS |
866 | if (new_flen != new_insn - first_insn) { |
867 | new_flen = new_insn - first_insn; | |
bd4cf0ed AS |
868 | if (pass > 2) |
869 | goto err; | |
bd4cf0ed AS |
870 | goto do_pass; |
871 | } | |
872 | ||
873 | kfree(addrs); | |
874 | BUG_ON(*new_len != new_flen); | |
1da177e4 | 875 | return 0; |
bd4cf0ed AS |
876 | err: |
877 | kfree(addrs); | |
878 | return -EINVAL; | |
1da177e4 LT |
879 | } |
880 | ||
bd4cf0ed | 881 | /* Security: |
bd4cf0ed | 882 | * |
2d5311e4 | 883 | * As we dont want to clear mem[] array for each packet going through |
8ea6e345 | 884 | * __bpf_prog_run(), we check that filter loaded by user never try to read |
2d5311e4 | 885 | * a cell if not previously written, and we check all branches to be sure |
25985edc | 886 | * a malicious user doesn't try to abuse us. |
2d5311e4 | 887 | */ |
ec31a05c | 888 | static int check_load_and_stores(const struct sock_filter *filter, int flen) |
2d5311e4 | 889 | { |
34805931 | 890 | u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ |
2d5311e4 ED |
891 | int pc, ret = 0; |
892 | ||
893 | BUILD_BUG_ON(BPF_MEMWORDS > 16); | |
34805931 | 894 | |
99e72a0f | 895 | masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL); |
2d5311e4 ED |
896 | if (!masks) |
897 | return -ENOMEM; | |
34805931 | 898 | |
2d5311e4 ED |
899 | memset(masks, 0xff, flen * sizeof(*masks)); |
900 | ||
901 | for (pc = 0; pc < flen; pc++) { | |
902 | memvalid &= masks[pc]; | |
903 | ||
904 | switch (filter[pc].code) { | |
34805931 DB |
905 | case BPF_ST: |
906 | case BPF_STX: | |
2d5311e4 ED |
907 | memvalid |= (1 << filter[pc].k); |
908 | break; | |
34805931 DB |
909 | case BPF_LD | BPF_MEM: |
910 | case BPF_LDX | BPF_MEM: | |
2d5311e4 ED |
911 | if (!(memvalid & (1 << filter[pc].k))) { |
912 | ret = -EINVAL; | |
913 | goto error; | |
914 | } | |
915 | break; | |
34805931 DB |
916 | case BPF_JMP | BPF_JA: |
917 | /* A jump must set masks on target */ | |
2d5311e4 ED |
918 | masks[pc + 1 + filter[pc].k] &= memvalid; |
919 | memvalid = ~0; | |
920 | break; | |
34805931 DB |
921 | case BPF_JMP | BPF_JEQ | BPF_K: |
922 | case BPF_JMP | BPF_JEQ | BPF_X: | |
923 | case BPF_JMP | BPF_JGE | BPF_K: | |
924 | case BPF_JMP | BPF_JGE | BPF_X: | |
925 | case BPF_JMP | BPF_JGT | BPF_K: | |
926 | case BPF_JMP | BPF_JGT | BPF_X: | |
927 | case BPF_JMP | BPF_JSET | BPF_K: | |
928 | case BPF_JMP | BPF_JSET | BPF_X: | |
929 | /* A jump must set masks on targets */ | |
2d5311e4 ED |
930 | masks[pc + 1 + filter[pc].jt] &= memvalid; |
931 | masks[pc + 1 + filter[pc].jf] &= memvalid; | |
932 | memvalid = ~0; | |
933 | break; | |
934 | } | |
935 | } | |
936 | error: | |
937 | kfree(masks); | |
938 | return ret; | |
939 | } | |
940 | ||
34805931 DB |
941 | static bool chk_code_allowed(u16 code_to_probe) |
942 | { | |
943 | static const bool codes[] = { | |
944 | /* 32 bit ALU operations */ | |
945 | [BPF_ALU | BPF_ADD | BPF_K] = true, | |
946 | [BPF_ALU | BPF_ADD | BPF_X] = true, | |
947 | [BPF_ALU | BPF_SUB | BPF_K] = true, | |
948 | [BPF_ALU | BPF_SUB | BPF_X] = true, | |
949 | [BPF_ALU | BPF_MUL | BPF_K] = true, | |
950 | [BPF_ALU | BPF_MUL | BPF_X] = true, | |
951 | [BPF_ALU | BPF_DIV | BPF_K] = true, | |
952 | [BPF_ALU | BPF_DIV | BPF_X] = true, | |
953 | [BPF_ALU | BPF_MOD | BPF_K] = true, | |
954 | [BPF_ALU | BPF_MOD | BPF_X] = true, | |
955 | [BPF_ALU | BPF_AND | BPF_K] = true, | |
956 | [BPF_ALU | BPF_AND | BPF_X] = true, | |
957 | [BPF_ALU | BPF_OR | BPF_K] = true, | |
958 | [BPF_ALU | BPF_OR | BPF_X] = true, | |
959 | [BPF_ALU | BPF_XOR | BPF_K] = true, | |
960 | [BPF_ALU | BPF_XOR | BPF_X] = true, | |
961 | [BPF_ALU | BPF_LSH | BPF_K] = true, | |
962 | [BPF_ALU | BPF_LSH | BPF_X] = true, | |
963 | [BPF_ALU | BPF_RSH | BPF_K] = true, | |
964 | [BPF_ALU | BPF_RSH | BPF_X] = true, | |
965 | [BPF_ALU | BPF_NEG] = true, | |
966 | /* Load instructions */ | |
967 | [BPF_LD | BPF_W | BPF_ABS] = true, | |
968 | [BPF_LD | BPF_H | BPF_ABS] = true, | |
969 | [BPF_LD | BPF_B | BPF_ABS] = true, | |
970 | [BPF_LD | BPF_W | BPF_LEN] = true, | |
971 | [BPF_LD | BPF_W | BPF_IND] = true, | |
972 | [BPF_LD | BPF_H | BPF_IND] = true, | |
973 | [BPF_LD | BPF_B | BPF_IND] = true, | |
974 | [BPF_LD | BPF_IMM] = true, | |
975 | [BPF_LD | BPF_MEM] = true, | |
976 | [BPF_LDX | BPF_W | BPF_LEN] = true, | |
977 | [BPF_LDX | BPF_B | BPF_MSH] = true, | |
978 | [BPF_LDX | BPF_IMM] = true, | |
979 | [BPF_LDX | BPF_MEM] = true, | |
980 | /* Store instructions */ | |
981 | [BPF_ST] = true, | |
982 | [BPF_STX] = true, | |
983 | /* Misc instructions */ | |
984 | [BPF_MISC | BPF_TAX] = true, | |
985 | [BPF_MISC | BPF_TXA] = true, | |
986 | /* Return instructions */ | |
987 | [BPF_RET | BPF_K] = true, | |
988 | [BPF_RET | BPF_A] = true, | |
989 | /* Jump instructions */ | |
990 | [BPF_JMP | BPF_JA] = true, | |
991 | [BPF_JMP | BPF_JEQ | BPF_K] = true, | |
992 | [BPF_JMP | BPF_JEQ | BPF_X] = true, | |
993 | [BPF_JMP | BPF_JGE | BPF_K] = true, | |
994 | [BPF_JMP | BPF_JGE | BPF_X] = true, | |
995 | [BPF_JMP | BPF_JGT | BPF_K] = true, | |
996 | [BPF_JMP | BPF_JGT | BPF_X] = true, | |
997 | [BPF_JMP | BPF_JSET | BPF_K] = true, | |
998 | [BPF_JMP | BPF_JSET | BPF_X] = true, | |
999 | }; | |
1000 | ||
1001 | if (code_to_probe >= ARRAY_SIZE(codes)) | |
1002 | return false; | |
1003 | ||
1004 | return codes[code_to_probe]; | |
1005 | } | |
1006 | ||
f7bd9e36 DB |
1007 | static bool bpf_check_basics_ok(const struct sock_filter *filter, |
1008 | unsigned int flen) | |
1009 | { | |
1010 | if (filter == NULL) | |
1011 | return false; | |
1012 | if (flen == 0 || flen > BPF_MAXINSNS) | |
1013 | return false; | |
1014 | ||
1015 | return true; | |
1016 | } | |
1017 | ||
1da177e4 | 1018 | /** |
4df95ff4 | 1019 | * bpf_check_classic - verify socket filter code |
1da177e4 LT |
1020 | * @filter: filter to verify |
1021 | * @flen: length of filter | |
1022 | * | |
1023 | * Check the user's filter code. If we let some ugly | |
1024 | * filter code slip through kaboom! The filter must contain | |
93699863 KK |
1025 | * no references or jumps that are out of range, no illegal |
1026 | * instructions, and must end with a RET instruction. | |
1da177e4 | 1027 | * |
7b11f69f KK |
1028 | * All jumps are forward as they are not signed. |
1029 | * | |
1030 | * Returns 0 if the rule set is legal or -EINVAL if not. | |
1da177e4 | 1031 | */ |
d9e12f42 NS |
1032 | static int bpf_check_classic(const struct sock_filter *filter, |
1033 | unsigned int flen) | |
1da177e4 | 1034 | { |
aa1113d9 | 1035 | bool anc_found; |
34805931 | 1036 | int pc; |
1da177e4 | 1037 | |
34805931 | 1038 | /* Check the filter code now */ |
1da177e4 | 1039 | for (pc = 0; pc < flen; pc++) { |
ec31a05c | 1040 | const struct sock_filter *ftest = &filter[pc]; |
93699863 | 1041 | |
34805931 DB |
1042 | /* May we actually operate on this code? */ |
1043 | if (!chk_code_allowed(ftest->code)) | |
cba328fc | 1044 | return -EINVAL; |
34805931 | 1045 | |
93699863 | 1046 | /* Some instructions need special checks */ |
34805931 DB |
1047 | switch (ftest->code) { |
1048 | case BPF_ALU | BPF_DIV | BPF_K: | |
1049 | case BPF_ALU | BPF_MOD | BPF_K: | |
1050 | /* Check for division by zero */ | |
b6069a95 ED |
1051 | if (ftest->k == 0) |
1052 | return -EINVAL; | |
1053 | break; | |
229394e8 RV |
1054 | case BPF_ALU | BPF_LSH | BPF_K: |
1055 | case BPF_ALU | BPF_RSH | BPF_K: | |
1056 | if (ftest->k >= 32) | |
1057 | return -EINVAL; | |
1058 | break; | |
34805931 DB |
1059 | case BPF_LD | BPF_MEM: |
1060 | case BPF_LDX | BPF_MEM: | |
1061 | case BPF_ST: | |
1062 | case BPF_STX: | |
1063 | /* Check for invalid memory addresses */ | |
93699863 KK |
1064 | if (ftest->k >= BPF_MEMWORDS) |
1065 | return -EINVAL; | |
1066 | break; | |
34805931 DB |
1067 | case BPF_JMP | BPF_JA: |
1068 | /* Note, the large ftest->k might cause loops. | |
93699863 KK |
1069 | * Compare this with conditional jumps below, |
1070 | * where offsets are limited. --ANK (981016) | |
1071 | */ | |
34805931 | 1072 | if (ftest->k >= (unsigned int)(flen - pc - 1)) |
93699863 | 1073 | return -EINVAL; |
01f2f3f6 | 1074 | break; |
34805931 DB |
1075 | case BPF_JMP | BPF_JEQ | BPF_K: |
1076 | case BPF_JMP | BPF_JEQ | BPF_X: | |
1077 | case BPF_JMP | BPF_JGE | BPF_K: | |
1078 | case BPF_JMP | BPF_JGE | BPF_X: | |
1079 | case BPF_JMP | BPF_JGT | BPF_K: | |
1080 | case BPF_JMP | BPF_JGT | BPF_X: | |
1081 | case BPF_JMP | BPF_JSET | BPF_K: | |
1082 | case BPF_JMP | BPF_JSET | BPF_X: | |
1083 | /* Both conditionals must be safe */ | |
e35bedf3 | 1084 | if (pc + ftest->jt + 1 >= flen || |
93699863 KK |
1085 | pc + ftest->jf + 1 >= flen) |
1086 | return -EINVAL; | |
cba328fc | 1087 | break; |
34805931 DB |
1088 | case BPF_LD | BPF_W | BPF_ABS: |
1089 | case BPF_LD | BPF_H | BPF_ABS: | |
1090 | case BPF_LD | BPF_B | BPF_ABS: | |
aa1113d9 | 1091 | anc_found = false; |
34805931 DB |
1092 | if (bpf_anc_helper(ftest) & BPF_ANC) |
1093 | anc_found = true; | |
1094 | /* Ancillary operation unknown or unsupported */ | |
aa1113d9 DB |
1095 | if (anc_found == false && ftest->k >= SKF_AD_OFF) |
1096 | return -EINVAL; | |
01f2f3f6 HPP |
1097 | } |
1098 | } | |
93699863 | 1099 | |
34805931 | 1100 | /* Last instruction must be a RET code */ |
01f2f3f6 | 1101 | switch (filter[flen - 1].code) { |
34805931 DB |
1102 | case BPF_RET | BPF_K: |
1103 | case BPF_RET | BPF_A: | |
2d5311e4 | 1104 | return check_load_and_stores(filter, flen); |
cba328fc | 1105 | } |
34805931 | 1106 | |
cba328fc | 1107 | return -EINVAL; |
1da177e4 LT |
1108 | } |
1109 | ||
7ae457c1 AS |
1110 | static int bpf_prog_store_orig_filter(struct bpf_prog *fp, |
1111 | const struct sock_fprog *fprog) | |
a3ea269b | 1112 | { |
009937e7 | 1113 | unsigned int fsize = bpf_classic_proglen(fprog); |
a3ea269b DB |
1114 | struct sock_fprog_kern *fkprog; |
1115 | ||
1116 | fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL); | |
1117 | if (!fp->orig_prog) | |
1118 | return -ENOMEM; | |
1119 | ||
1120 | fkprog = fp->orig_prog; | |
1121 | fkprog->len = fprog->len; | |
658da937 DB |
1122 | |
1123 | fkprog->filter = kmemdup(fp->insns, fsize, | |
1124 | GFP_KERNEL | __GFP_NOWARN); | |
a3ea269b DB |
1125 | if (!fkprog->filter) { |
1126 | kfree(fp->orig_prog); | |
1127 | return -ENOMEM; | |
1128 | } | |
1129 | ||
1130 | return 0; | |
1131 | } | |
1132 | ||
7ae457c1 | 1133 | static void bpf_release_orig_filter(struct bpf_prog *fp) |
a3ea269b DB |
1134 | { |
1135 | struct sock_fprog_kern *fprog = fp->orig_prog; | |
1136 | ||
1137 | if (fprog) { | |
1138 | kfree(fprog->filter); | |
1139 | kfree(fprog); | |
1140 | } | |
1141 | } | |
1142 | ||
7ae457c1 AS |
1143 | static void __bpf_prog_release(struct bpf_prog *prog) |
1144 | { | |
24701ece | 1145 | if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) { |
89aa0758 AS |
1146 | bpf_prog_put(prog); |
1147 | } else { | |
1148 | bpf_release_orig_filter(prog); | |
1149 | bpf_prog_free(prog); | |
1150 | } | |
7ae457c1 AS |
1151 | } |
1152 | ||
34c5bd66 PN |
1153 | static void __sk_filter_release(struct sk_filter *fp) |
1154 | { | |
7ae457c1 AS |
1155 | __bpf_prog_release(fp->prog); |
1156 | kfree(fp); | |
34c5bd66 PN |
1157 | } |
1158 | ||
47e958ea | 1159 | /** |
46bcf14f | 1160 | * sk_filter_release_rcu - Release a socket filter by rcu_head |
47e958ea PE |
1161 | * @rcu: rcu_head that contains the sk_filter to free |
1162 | */ | |
fbc907f0 | 1163 | static void sk_filter_release_rcu(struct rcu_head *rcu) |
47e958ea PE |
1164 | { |
1165 | struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); | |
1166 | ||
34c5bd66 | 1167 | __sk_filter_release(fp); |
47e958ea | 1168 | } |
fbc907f0 DB |
1169 | |
1170 | /** | |
1171 | * sk_filter_release - release a socket filter | |
1172 | * @fp: filter to remove | |
1173 | * | |
1174 | * Remove a filter from a socket and release its resources. | |
1175 | */ | |
1176 | static void sk_filter_release(struct sk_filter *fp) | |
1177 | { | |
4c355cdf | 1178 | if (refcount_dec_and_test(&fp->refcnt)) |
fbc907f0 DB |
1179 | call_rcu(&fp->rcu, sk_filter_release_rcu); |
1180 | } | |
1181 | ||
1182 | void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) | |
1183 | { | |
7ae457c1 | 1184 | u32 filter_size = bpf_prog_size(fp->prog->len); |
fbc907f0 | 1185 | |
278571ba AS |
1186 | atomic_sub(filter_size, &sk->sk_omem_alloc); |
1187 | sk_filter_release(fp); | |
fbc907f0 | 1188 | } |
47e958ea | 1189 | |
278571ba AS |
1190 | /* try to charge the socket memory if there is space available |
1191 | * return true on success | |
1192 | */ | |
4c355cdf | 1193 | static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
bd4cf0ed | 1194 | { |
7ae457c1 | 1195 | u32 filter_size = bpf_prog_size(fp->prog->len); |
278571ba AS |
1196 | |
1197 | /* same check as in sock_kmalloc() */ | |
1198 | if (filter_size <= sysctl_optmem_max && | |
1199 | atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) { | |
278571ba AS |
1200 | atomic_add(filter_size, &sk->sk_omem_alloc); |
1201 | return true; | |
bd4cf0ed | 1202 | } |
278571ba | 1203 | return false; |
bd4cf0ed AS |
1204 | } |
1205 | ||
4c355cdf RE |
1206 | bool sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
1207 | { | |
eefca20e ED |
1208 | if (!refcount_inc_not_zero(&fp->refcnt)) |
1209 | return false; | |
1210 | ||
1211 | if (!__sk_filter_charge(sk, fp)) { | |
1212 | sk_filter_release(fp); | |
1213 | return false; | |
1214 | } | |
1215 | return true; | |
4c355cdf RE |
1216 | } |
1217 | ||
7ae457c1 | 1218 | static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp) |
bd4cf0ed AS |
1219 | { |
1220 | struct sock_filter *old_prog; | |
7ae457c1 | 1221 | struct bpf_prog *old_fp; |
34805931 | 1222 | int err, new_len, old_len = fp->len; |
e0cea7ce | 1223 | bool seen_ld_abs = false; |
bd4cf0ed AS |
1224 | |
1225 | /* We are free to overwrite insns et al right here as it | |
1226 | * won't be used at this point in time anymore internally | |
1227 | * after the migration to the internal BPF instruction | |
1228 | * representation. | |
1229 | */ | |
1230 | BUILD_BUG_ON(sizeof(struct sock_filter) != | |
2695fb55 | 1231 | sizeof(struct bpf_insn)); |
bd4cf0ed | 1232 | |
bd4cf0ed AS |
1233 | /* Conversion cannot happen on overlapping memory areas, |
1234 | * so we need to keep the user BPF around until the 2nd | |
1235 | * pass. At this time, the user BPF is stored in fp->insns. | |
1236 | */ | |
1237 | old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter), | |
658da937 | 1238 | GFP_KERNEL | __GFP_NOWARN); |
bd4cf0ed AS |
1239 | if (!old_prog) { |
1240 | err = -ENOMEM; | |
1241 | goto out_err; | |
1242 | } | |
1243 | ||
1244 | /* 1st pass: calculate the new program length. */ | |
e0cea7ce DB |
1245 | err = bpf_convert_filter(old_prog, old_len, NULL, &new_len, |
1246 | &seen_ld_abs); | |
bd4cf0ed AS |
1247 | if (err) |
1248 | goto out_err_free; | |
1249 | ||
1250 | /* Expand fp for appending the new filter representation. */ | |
1251 | old_fp = fp; | |
60a3b225 | 1252 | fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0); |
bd4cf0ed AS |
1253 | if (!fp) { |
1254 | /* The old_fp is still around in case we couldn't | |
1255 | * allocate new memory, so uncharge on that one. | |
1256 | */ | |
1257 | fp = old_fp; | |
1258 | err = -ENOMEM; | |
1259 | goto out_err_free; | |
1260 | } | |
1261 | ||
bd4cf0ed AS |
1262 | fp->len = new_len; |
1263 | ||
2695fb55 | 1264 | /* 2nd pass: remap sock_filter insns into bpf_insn insns. */ |
e0cea7ce DB |
1265 | err = bpf_convert_filter(old_prog, old_len, fp, &new_len, |
1266 | &seen_ld_abs); | |
bd4cf0ed | 1267 | if (err) |
8fb575ca | 1268 | /* 2nd bpf_convert_filter() can fail only if it fails |
bd4cf0ed AS |
1269 | * to allocate memory, remapping must succeed. Note, |
1270 | * that at this time old_fp has already been released | |
278571ba | 1271 | * by krealloc(). |
bd4cf0ed AS |
1272 | */ |
1273 | goto out_err_free; | |
1274 | ||
d1c55ab5 | 1275 | fp = bpf_prog_select_runtime(fp, &err); |
290af866 AS |
1276 | if (err) |
1277 | goto out_err_free; | |
5fe821a9 | 1278 | |
bd4cf0ed AS |
1279 | kfree(old_prog); |
1280 | return fp; | |
1281 | ||
1282 | out_err_free: | |
1283 | kfree(old_prog); | |
1284 | out_err: | |
7ae457c1 | 1285 | __bpf_prog_release(fp); |
bd4cf0ed AS |
1286 | return ERR_PTR(err); |
1287 | } | |
1288 | ||
ac67eb2c DB |
1289 | static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp, |
1290 | bpf_aux_classic_check_t trans) | |
302d6637 JP |
1291 | { |
1292 | int err; | |
1293 | ||
bd4cf0ed | 1294 | fp->bpf_func = NULL; |
a91263d5 | 1295 | fp->jited = 0; |
302d6637 | 1296 | |
4df95ff4 | 1297 | err = bpf_check_classic(fp->insns, fp->len); |
418c96ac | 1298 | if (err) { |
7ae457c1 | 1299 | __bpf_prog_release(fp); |
bd4cf0ed | 1300 | return ERR_PTR(err); |
418c96ac | 1301 | } |
302d6637 | 1302 | |
4ae92bc7 NS |
1303 | /* There might be additional checks and transformations |
1304 | * needed on classic filters, f.e. in case of seccomp. | |
1305 | */ | |
1306 | if (trans) { | |
1307 | err = trans(fp->insns, fp->len); | |
1308 | if (err) { | |
1309 | __bpf_prog_release(fp); | |
1310 | return ERR_PTR(err); | |
1311 | } | |
1312 | } | |
1313 | ||
bd4cf0ed AS |
1314 | /* Probe if we can JIT compile the filter and if so, do |
1315 | * the compilation of the filter. | |
1316 | */ | |
302d6637 | 1317 | bpf_jit_compile(fp); |
bd4cf0ed AS |
1318 | |
1319 | /* JIT compiler couldn't process this filter, so do the | |
1320 | * internal BPF translation for the optimized interpreter. | |
1321 | */ | |
5fe821a9 | 1322 | if (!fp->jited) |
7ae457c1 | 1323 | fp = bpf_migrate_filter(fp); |
bd4cf0ed AS |
1324 | |
1325 | return fp; | |
302d6637 JP |
1326 | } |
1327 | ||
1328 | /** | |
7ae457c1 | 1329 | * bpf_prog_create - create an unattached filter |
c6c4b97c | 1330 | * @pfp: the unattached filter that is created |
677a9fd3 | 1331 | * @fprog: the filter program |
302d6637 | 1332 | * |
c6c4b97c | 1333 | * Create a filter independent of any socket. We first run some |
302d6637 JP |
1334 | * sanity checks on it to make sure it does not explode on us later. |
1335 | * If an error occurs or there is insufficient memory for the filter | |
1336 | * a negative errno code is returned. On success the return is zero. | |
1337 | */ | |
7ae457c1 | 1338 | int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog) |
302d6637 | 1339 | { |
009937e7 | 1340 | unsigned int fsize = bpf_classic_proglen(fprog); |
7ae457c1 | 1341 | struct bpf_prog *fp; |
302d6637 JP |
1342 | |
1343 | /* Make sure new filter is there and in the right amounts. */ | |
f7bd9e36 | 1344 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
302d6637 JP |
1345 | return -EINVAL; |
1346 | ||
60a3b225 | 1347 | fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
302d6637 JP |
1348 | if (!fp) |
1349 | return -ENOMEM; | |
a3ea269b | 1350 | |
302d6637 JP |
1351 | memcpy(fp->insns, fprog->filter, fsize); |
1352 | ||
302d6637 | 1353 | fp->len = fprog->len; |
a3ea269b DB |
1354 | /* Since unattached filters are not copied back to user |
1355 | * space through sk_get_filter(), we do not need to hold | |
1356 | * a copy here, and can spare us the work. | |
1357 | */ | |
1358 | fp->orig_prog = NULL; | |
302d6637 | 1359 | |
7ae457c1 | 1360 | /* bpf_prepare_filter() already takes care of freeing |
bd4cf0ed AS |
1361 | * memory in case something goes wrong. |
1362 | */ | |
4ae92bc7 | 1363 | fp = bpf_prepare_filter(fp, NULL); |
bd4cf0ed AS |
1364 | if (IS_ERR(fp)) |
1365 | return PTR_ERR(fp); | |
302d6637 JP |
1366 | |
1367 | *pfp = fp; | |
1368 | return 0; | |
302d6637 | 1369 | } |
7ae457c1 | 1370 | EXPORT_SYMBOL_GPL(bpf_prog_create); |
302d6637 | 1371 | |
ac67eb2c DB |
1372 | /** |
1373 | * bpf_prog_create_from_user - create an unattached filter from user buffer | |
1374 | * @pfp: the unattached filter that is created | |
1375 | * @fprog: the filter program | |
1376 | * @trans: post-classic verifier transformation handler | |
bab18991 | 1377 | * @save_orig: save classic BPF program |
ac67eb2c DB |
1378 | * |
1379 | * This function effectively does the same as bpf_prog_create(), only | |
1380 | * that it builds up its insns buffer from user space provided buffer. | |
1381 | * It also allows for passing a bpf_aux_classic_check_t handler. | |
1382 | */ | |
1383 | int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, | |
bab18991 | 1384 | bpf_aux_classic_check_t trans, bool save_orig) |
ac67eb2c DB |
1385 | { |
1386 | unsigned int fsize = bpf_classic_proglen(fprog); | |
1387 | struct bpf_prog *fp; | |
bab18991 | 1388 | int err; |
ac67eb2c DB |
1389 | |
1390 | /* Make sure new filter is there and in the right amounts. */ | |
f7bd9e36 | 1391 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
ac67eb2c DB |
1392 | return -EINVAL; |
1393 | ||
1394 | fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); | |
1395 | if (!fp) | |
1396 | return -ENOMEM; | |
1397 | ||
1398 | if (copy_from_user(fp->insns, fprog->filter, fsize)) { | |
1399 | __bpf_prog_free(fp); | |
1400 | return -EFAULT; | |
1401 | } | |
1402 | ||
1403 | fp->len = fprog->len; | |
ac67eb2c DB |
1404 | fp->orig_prog = NULL; |
1405 | ||
bab18991 DB |
1406 | if (save_orig) { |
1407 | err = bpf_prog_store_orig_filter(fp, fprog); | |
1408 | if (err) { | |
1409 | __bpf_prog_free(fp); | |
1410 | return -ENOMEM; | |
1411 | } | |
1412 | } | |
1413 | ||
ac67eb2c DB |
1414 | /* bpf_prepare_filter() already takes care of freeing |
1415 | * memory in case something goes wrong. | |
1416 | */ | |
1417 | fp = bpf_prepare_filter(fp, trans); | |
1418 | if (IS_ERR(fp)) | |
1419 | return PTR_ERR(fp); | |
1420 | ||
1421 | *pfp = fp; | |
1422 | return 0; | |
1423 | } | |
2ea273d7 | 1424 | EXPORT_SYMBOL_GPL(bpf_prog_create_from_user); |
ac67eb2c | 1425 | |
7ae457c1 | 1426 | void bpf_prog_destroy(struct bpf_prog *fp) |
302d6637 | 1427 | { |
7ae457c1 | 1428 | __bpf_prog_release(fp); |
302d6637 | 1429 | } |
7ae457c1 | 1430 | EXPORT_SYMBOL_GPL(bpf_prog_destroy); |
302d6637 | 1431 | |
8ced425e | 1432 | static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk) |
49b31e57 DB |
1433 | { |
1434 | struct sk_filter *fp, *old_fp; | |
1435 | ||
1436 | fp = kmalloc(sizeof(*fp), GFP_KERNEL); | |
1437 | if (!fp) | |
1438 | return -ENOMEM; | |
1439 | ||
1440 | fp->prog = prog; | |
49b31e57 | 1441 | |
4c355cdf | 1442 | if (!__sk_filter_charge(sk, fp)) { |
49b31e57 DB |
1443 | kfree(fp); |
1444 | return -ENOMEM; | |
1445 | } | |
4c355cdf | 1446 | refcount_set(&fp->refcnt, 1); |
49b31e57 | 1447 | |
8ced425e HFS |
1448 | old_fp = rcu_dereference_protected(sk->sk_filter, |
1449 | lockdep_sock_is_held(sk)); | |
49b31e57 | 1450 | rcu_assign_pointer(sk->sk_filter, fp); |
8ced425e | 1451 | |
49b31e57 DB |
1452 | if (old_fp) |
1453 | sk_filter_uncharge(sk, old_fp); | |
1454 | ||
1455 | return 0; | |
1456 | } | |
1457 | ||
538950a1 CG |
1458 | static |
1459 | struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk) | |
1da177e4 | 1460 | { |
009937e7 | 1461 | unsigned int fsize = bpf_classic_proglen(fprog); |
7ae457c1 | 1462 | struct bpf_prog *prog; |
1da177e4 LT |
1463 | int err; |
1464 | ||
d59577b6 | 1465 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
538950a1 | 1466 | return ERR_PTR(-EPERM); |
d59577b6 | 1467 | |
1da177e4 | 1468 | /* Make sure new filter is there and in the right amounts. */ |
f7bd9e36 | 1469 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
538950a1 | 1470 | return ERR_PTR(-EINVAL); |
1da177e4 | 1471 | |
f7bd9e36 | 1472 | prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
7ae457c1 | 1473 | if (!prog) |
538950a1 | 1474 | return ERR_PTR(-ENOMEM); |
a3ea269b | 1475 | |
7ae457c1 | 1476 | if (copy_from_user(prog->insns, fprog->filter, fsize)) { |
c0d1379a | 1477 | __bpf_prog_free(prog); |
538950a1 | 1478 | return ERR_PTR(-EFAULT); |
1da177e4 LT |
1479 | } |
1480 | ||
7ae457c1 | 1481 | prog->len = fprog->len; |
1da177e4 | 1482 | |
7ae457c1 | 1483 | err = bpf_prog_store_orig_filter(prog, fprog); |
a3ea269b | 1484 | if (err) { |
c0d1379a | 1485 | __bpf_prog_free(prog); |
538950a1 | 1486 | return ERR_PTR(-ENOMEM); |
a3ea269b DB |
1487 | } |
1488 | ||
7ae457c1 | 1489 | /* bpf_prepare_filter() already takes care of freeing |
bd4cf0ed AS |
1490 | * memory in case something goes wrong. |
1491 | */ | |
538950a1 CG |
1492 | return bpf_prepare_filter(prog, NULL); |
1493 | } | |
1494 | ||
1495 | /** | |
1496 | * sk_attach_filter - attach a socket filter | |
1497 | * @fprog: the filter program | |
1498 | * @sk: the socket to use | |
1499 | * | |
1500 | * Attach the user's filter code. We first run some sanity checks on | |
1501 | * it to make sure it does not explode on us later. If an error | |
1502 | * occurs or there is insufficient memory for the filter a negative | |
1503 | * errno code is returned. On success the return is zero. | |
1504 | */ | |
8ced425e | 1505 | int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) |
538950a1 CG |
1506 | { |
1507 | struct bpf_prog *prog = __get_filter(fprog, sk); | |
1508 | int err; | |
1509 | ||
7ae457c1 AS |
1510 | if (IS_ERR(prog)) |
1511 | return PTR_ERR(prog); | |
1512 | ||
8ced425e | 1513 | err = __sk_attach_prog(prog, sk); |
49b31e57 | 1514 | if (err < 0) { |
7ae457c1 | 1515 | __bpf_prog_release(prog); |
49b31e57 | 1516 | return err; |
278571ba AS |
1517 | } |
1518 | ||
d3904b73 | 1519 | return 0; |
1da177e4 | 1520 | } |
8ced425e | 1521 | EXPORT_SYMBOL_GPL(sk_attach_filter); |
1da177e4 | 1522 | |
538950a1 | 1523 | int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk) |
89aa0758 | 1524 | { |
538950a1 | 1525 | struct bpf_prog *prog = __get_filter(fprog, sk); |
49b31e57 | 1526 | int err; |
89aa0758 | 1527 | |
538950a1 CG |
1528 | if (IS_ERR(prog)) |
1529 | return PTR_ERR(prog); | |
1530 | ||
8217ca65 MKL |
1531 | if (bpf_prog_size(prog->len) > sysctl_optmem_max) |
1532 | err = -ENOMEM; | |
1533 | else | |
1534 | err = reuseport_attach_prog(sk, prog); | |
1535 | ||
1536 | if (err) | |
538950a1 | 1537 | __bpf_prog_release(prog); |
538950a1 | 1538 | |
8217ca65 | 1539 | return err; |
538950a1 CG |
1540 | } |
1541 | ||
1542 | static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk) | |
1543 | { | |
89aa0758 | 1544 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
538950a1 | 1545 | return ERR_PTR(-EPERM); |
89aa0758 | 1546 | |
113214be | 1547 | return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); |
538950a1 CG |
1548 | } |
1549 | ||
1550 | int sk_attach_bpf(u32 ufd, struct sock *sk) | |
1551 | { | |
1552 | struct bpf_prog *prog = __get_bpf(ufd, sk); | |
1553 | int err; | |
1554 | ||
1555 | if (IS_ERR(prog)) | |
1556 | return PTR_ERR(prog); | |
1557 | ||
8ced425e | 1558 | err = __sk_attach_prog(prog, sk); |
49b31e57 | 1559 | if (err < 0) { |
89aa0758 | 1560 | bpf_prog_put(prog); |
49b31e57 | 1561 | return err; |
89aa0758 AS |
1562 | } |
1563 | ||
89aa0758 AS |
1564 | return 0; |
1565 | } | |
1566 | ||
538950a1 CG |
1567 | int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk) |
1568 | { | |
8217ca65 | 1569 | struct bpf_prog *prog; |
538950a1 CG |
1570 | int err; |
1571 | ||
8217ca65 MKL |
1572 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
1573 | return -EPERM; | |
1574 | ||
1575 | prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); | |
1576 | if (IS_ERR(prog) && PTR_ERR(prog) == -EINVAL) | |
1577 | prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT); | |
538950a1 CG |
1578 | if (IS_ERR(prog)) |
1579 | return PTR_ERR(prog); | |
1580 | ||
8217ca65 MKL |
1581 | if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) { |
1582 | /* Like other non BPF_PROG_TYPE_SOCKET_FILTER | |
1583 | * bpf prog (e.g. sockmap). It depends on the | |
1584 | * limitation imposed by bpf_prog_load(). | |
1585 | * Hence, sysctl_optmem_max is not checked. | |
1586 | */ | |
1587 | if ((sk->sk_type != SOCK_STREAM && | |
1588 | sk->sk_type != SOCK_DGRAM) || | |
1589 | (sk->sk_protocol != IPPROTO_UDP && | |
1590 | sk->sk_protocol != IPPROTO_TCP) || | |
1591 | (sk->sk_family != AF_INET && | |
1592 | sk->sk_family != AF_INET6)) { | |
1593 | err = -ENOTSUPP; | |
1594 | goto err_prog_put; | |
1595 | } | |
1596 | } else { | |
1597 | /* BPF_PROG_TYPE_SOCKET_FILTER */ | |
1598 | if (bpf_prog_size(prog->len) > sysctl_optmem_max) { | |
1599 | err = -ENOMEM; | |
1600 | goto err_prog_put; | |
1601 | } | |
538950a1 CG |
1602 | } |
1603 | ||
8217ca65 MKL |
1604 | err = reuseport_attach_prog(sk, prog); |
1605 | err_prog_put: | |
1606 | if (err) | |
1607 | bpf_prog_put(prog); | |
1608 | ||
1609 | return err; | |
1610 | } | |
1611 | ||
1612 | void sk_reuseport_prog_free(struct bpf_prog *prog) | |
1613 | { | |
1614 | if (!prog) | |
1615 | return; | |
1616 | ||
1617 | if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) | |
1618 | bpf_prog_put(prog); | |
1619 | else | |
1620 | bpf_prog_destroy(prog); | |
538950a1 CG |
1621 | } |
1622 | ||
21cafc1d DB |
1623 | struct bpf_scratchpad { |
1624 | union { | |
1625 | __be32 diff[MAX_BPF_STACK / sizeof(__be32)]; | |
1626 | u8 buff[MAX_BPF_STACK]; | |
1627 | }; | |
1628 | }; | |
1629 | ||
1630 | static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp); | |
91bc4822 | 1631 | |
5293efe6 DB |
1632 | static inline int __bpf_try_make_writable(struct sk_buff *skb, |
1633 | unsigned int write_len) | |
1634 | { | |
1635 | return skb_ensure_writable(skb, write_len); | |
1636 | } | |
1637 | ||
db58ba45 AS |
1638 | static inline int bpf_try_make_writable(struct sk_buff *skb, |
1639 | unsigned int write_len) | |
1640 | { | |
5293efe6 | 1641 | int err = __bpf_try_make_writable(skb, write_len); |
db58ba45 | 1642 | |
6aaae2b6 | 1643 | bpf_compute_data_pointers(skb); |
db58ba45 AS |
1644 | return err; |
1645 | } | |
1646 | ||
36bbef52 DB |
1647 | static int bpf_try_make_head_writable(struct sk_buff *skb) |
1648 | { | |
1649 | return bpf_try_make_writable(skb, skb_headlen(skb)); | |
1650 | } | |
1651 | ||
a2bfe6bf DB |
1652 | static inline void bpf_push_mac_rcsum(struct sk_buff *skb) |
1653 | { | |
1654 | if (skb_at_tc_ingress(skb)) | |
1655 | skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len); | |
1656 | } | |
1657 | ||
8065694e DB |
1658 | static inline void bpf_pull_mac_rcsum(struct sk_buff *skb) |
1659 | { | |
1660 | if (skb_at_tc_ingress(skb)) | |
1661 | skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len); | |
1662 | } | |
1663 | ||
f3694e00 DB |
1664 | BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset, |
1665 | const void *, from, u32, len, u64, flags) | |
608cd71a | 1666 | { |
608cd71a AS |
1667 | void *ptr; |
1668 | ||
8afd54c8 | 1669 | if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH))) |
781c53bc | 1670 | return -EINVAL; |
0ed661d5 | 1671 | if (unlikely(offset > 0xffff)) |
608cd71a | 1672 | return -EFAULT; |
db58ba45 | 1673 | if (unlikely(bpf_try_make_writable(skb, offset + len))) |
608cd71a AS |
1674 | return -EFAULT; |
1675 | ||
0ed661d5 | 1676 | ptr = skb->data + offset; |
781c53bc | 1677 | if (flags & BPF_F_RECOMPUTE_CSUM) |
479ffccc | 1678 | __skb_postpull_rcsum(skb, ptr, len, offset); |
608cd71a AS |
1679 | |
1680 | memcpy(ptr, from, len); | |
1681 | ||
781c53bc | 1682 | if (flags & BPF_F_RECOMPUTE_CSUM) |
479ffccc | 1683 | __skb_postpush_rcsum(skb, ptr, len, offset); |
8afd54c8 DB |
1684 | if (flags & BPF_F_INVALIDATE_HASH) |
1685 | skb_clear_hash(skb); | |
f8ffad69 | 1686 | |
608cd71a AS |
1687 | return 0; |
1688 | } | |
1689 | ||
577c50aa | 1690 | static const struct bpf_func_proto bpf_skb_store_bytes_proto = { |
608cd71a AS |
1691 | .func = bpf_skb_store_bytes, |
1692 | .gpl_only = false, | |
1693 | .ret_type = RET_INTEGER, | |
1694 | .arg1_type = ARG_PTR_TO_CTX, | |
1695 | .arg2_type = ARG_ANYTHING, | |
39f19ebb AS |
1696 | .arg3_type = ARG_PTR_TO_MEM, |
1697 | .arg4_type = ARG_CONST_SIZE, | |
91bc4822 AS |
1698 | .arg5_type = ARG_ANYTHING, |
1699 | }; | |
1700 | ||
f3694e00 DB |
1701 | BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset, |
1702 | void *, to, u32, len) | |
05c74e5e | 1703 | { |
05c74e5e DB |
1704 | void *ptr; |
1705 | ||
0ed661d5 | 1706 | if (unlikely(offset > 0xffff)) |
074f528e | 1707 | goto err_clear; |
05c74e5e DB |
1708 | |
1709 | ptr = skb_header_pointer(skb, offset, len, to); | |
1710 | if (unlikely(!ptr)) | |
074f528e | 1711 | goto err_clear; |
05c74e5e DB |
1712 | if (ptr != to) |
1713 | memcpy(to, ptr, len); | |
1714 | ||
1715 | return 0; | |
074f528e DB |
1716 | err_clear: |
1717 | memset(to, 0, len); | |
1718 | return -EFAULT; | |
05c74e5e DB |
1719 | } |
1720 | ||
577c50aa | 1721 | static const struct bpf_func_proto bpf_skb_load_bytes_proto = { |
05c74e5e DB |
1722 | .func = bpf_skb_load_bytes, |
1723 | .gpl_only = false, | |
1724 | .ret_type = RET_INTEGER, | |
1725 | .arg1_type = ARG_PTR_TO_CTX, | |
1726 | .arg2_type = ARG_ANYTHING, | |
39f19ebb AS |
1727 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, |
1728 | .arg4_type = ARG_CONST_SIZE, | |
05c74e5e DB |
1729 | }; |
1730 | ||
4e1ec56c DB |
1731 | BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb, |
1732 | u32, offset, void *, to, u32, len, u32, start_header) | |
1733 | { | |
3eee1f75 DB |
1734 | u8 *end = skb_tail_pointer(skb); |
1735 | u8 *net = skb_network_header(skb); | |
1736 | u8 *mac = skb_mac_header(skb); | |
4e1ec56c DB |
1737 | u8 *ptr; |
1738 | ||
3eee1f75 | 1739 | if (unlikely(offset > 0xffff || len > (end - mac))) |
4e1ec56c DB |
1740 | goto err_clear; |
1741 | ||
1742 | switch (start_header) { | |
1743 | case BPF_HDR_START_MAC: | |
3eee1f75 | 1744 | ptr = mac + offset; |
4e1ec56c DB |
1745 | break; |
1746 | case BPF_HDR_START_NET: | |
3eee1f75 | 1747 | ptr = net + offset; |
4e1ec56c DB |
1748 | break; |
1749 | default: | |
1750 | goto err_clear; | |
1751 | } | |
1752 | ||
3eee1f75 | 1753 | if (likely(ptr >= mac && ptr + len <= end)) { |
4e1ec56c DB |
1754 | memcpy(to, ptr, len); |
1755 | return 0; | |
1756 | } | |
1757 | ||
1758 | err_clear: | |
1759 | memset(to, 0, len); | |
1760 | return -EFAULT; | |
1761 | } | |
1762 | ||
1763 | static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = { | |
1764 | .func = bpf_skb_load_bytes_relative, | |
1765 | .gpl_only = false, | |
1766 | .ret_type = RET_INTEGER, | |
1767 | .arg1_type = ARG_PTR_TO_CTX, | |
1768 | .arg2_type = ARG_ANYTHING, | |
1769 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, | |
1770 | .arg4_type = ARG_CONST_SIZE, | |
1771 | .arg5_type = ARG_ANYTHING, | |
1772 | }; | |
1773 | ||
36bbef52 DB |
1774 | BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) |
1775 | { | |
1776 | /* Idea is the following: should the needed direct read/write | |
1777 | * test fail during runtime, we can pull in more data and redo | |
1778 | * again, since implicitly, we invalidate previous checks here. | |
1779 | * | |
1780 | * Or, since we know how much we need to make read/writeable, | |
1781 | * this can be done once at the program beginning for direct | |
1782 | * access case. By this we overcome limitations of only current | |
1783 | * headroom being accessible. | |
1784 | */ | |
1785 | return bpf_try_make_writable(skb, len ? : skb_headlen(skb)); | |
1786 | } | |
1787 | ||
1788 | static const struct bpf_func_proto bpf_skb_pull_data_proto = { | |
1789 | .func = bpf_skb_pull_data, | |
1790 | .gpl_only = false, | |
1791 | .ret_type = RET_INTEGER, | |
1792 | .arg1_type = ARG_PTR_TO_CTX, | |
1793 | .arg2_type = ARG_ANYTHING, | |
1794 | }; | |
1795 | ||
0ea488ff JF |
1796 | static inline int sk_skb_try_make_writable(struct sk_buff *skb, |
1797 | unsigned int write_len) | |
1798 | { | |
1799 | int err = __bpf_try_make_writable(skb, write_len); | |
1800 | ||
1801 | bpf_compute_data_end_sk_skb(skb); | |
1802 | return err; | |
1803 | } | |
1804 | ||
1805 | BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len) | |
1806 | { | |
1807 | /* Idea is the following: should the needed direct read/write | |
1808 | * test fail during runtime, we can pull in more data and redo | |
1809 | * again, since implicitly, we invalidate previous checks here. | |
1810 | * | |
1811 | * Or, since we know how much we need to make read/writeable, | |
1812 | * this can be done once at the program beginning for direct | |
1813 | * access case. By this we overcome limitations of only current | |
1814 | * headroom being accessible. | |
1815 | */ | |
1816 | return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb)); | |
1817 | } | |
1818 | ||
1819 | static const struct bpf_func_proto sk_skb_pull_data_proto = { | |
1820 | .func = sk_skb_pull_data, | |
1821 | .gpl_only = false, | |
1822 | .ret_type = RET_INTEGER, | |
1823 | .arg1_type = ARG_PTR_TO_CTX, | |
1824 | .arg2_type = ARG_ANYTHING, | |
1825 | }; | |
1826 | ||
f3694e00 DB |
1827 | BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset, |
1828 | u64, from, u64, to, u64, flags) | |
91bc4822 | 1829 | { |
0ed661d5 | 1830 | __sum16 *ptr; |
91bc4822 | 1831 | |
781c53bc DB |
1832 | if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK))) |
1833 | return -EINVAL; | |
0ed661d5 | 1834 | if (unlikely(offset > 0xffff || offset & 1)) |
91bc4822 | 1835 | return -EFAULT; |
0ed661d5 | 1836 | if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) |
91bc4822 AS |
1837 | return -EFAULT; |
1838 | ||
0ed661d5 | 1839 | ptr = (__sum16 *)(skb->data + offset); |
781c53bc | 1840 | switch (flags & BPF_F_HDR_FIELD_MASK) { |
8050c0f0 DB |
1841 | case 0: |
1842 | if (unlikely(from != 0)) | |
1843 | return -EINVAL; | |
1844 | ||
1845 | csum_replace_by_diff(ptr, to); | |
1846 | break; | |
91bc4822 AS |
1847 | case 2: |
1848 | csum_replace2(ptr, from, to); | |
1849 | break; | |
1850 | case 4: | |
1851 | csum_replace4(ptr, from, to); | |
1852 | break; | |
1853 | default: | |
1854 | return -EINVAL; | |
1855 | } | |
1856 | ||
91bc4822 AS |
1857 | return 0; |
1858 | } | |
1859 | ||
577c50aa | 1860 | static const struct bpf_func_proto bpf_l3_csum_replace_proto = { |
91bc4822 AS |
1861 | .func = bpf_l3_csum_replace, |
1862 | .gpl_only = false, | |
1863 | .ret_type = RET_INTEGER, | |
1864 | .arg1_type = ARG_PTR_TO_CTX, | |
1865 | .arg2_type = ARG_ANYTHING, | |
1866 | .arg3_type = ARG_ANYTHING, | |
1867 | .arg4_type = ARG_ANYTHING, | |
1868 | .arg5_type = ARG_ANYTHING, | |
1869 | }; | |
1870 | ||
f3694e00 DB |
1871 | BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, |
1872 | u64, from, u64, to, u64, flags) | |
91bc4822 | 1873 | { |
781c53bc | 1874 | bool is_pseudo = flags & BPF_F_PSEUDO_HDR; |
2f72959a | 1875 | bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; |
d1b662ad | 1876 | bool do_mforce = flags & BPF_F_MARK_ENFORCE; |
0ed661d5 | 1877 | __sum16 *ptr; |
91bc4822 | 1878 | |
d1b662ad DB |
1879 | if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | |
1880 | BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) | |
781c53bc | 1881 | return -EINVAL; |
0ed661d5 | 1882 | if (unlikely(offset > 0xffff || offset & 1)) |
91bc4822 | 1883 | return -EFAULT; |
0ed661d5 | 1884 | if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) |
91bc4822 AS |
1885 | return -EFAULT; |
1886 | ||
0ed661d5 | 1887 | ptr = (__sum16 *)(skb->data + offset); |
d1b662ad | 1888 | if (is_mmzero && !do_mforce && !*ptr) |
2f72959a | 1889 | return 0; |
91bc4822 | 1890 | |
781c53bc | 1891 | switch (flags & BPF_F_HDR_FIELD_MASK) { |
7d672345 DB |
1892 | case 0: |
1893 | if (unlikely(from != 0)) | |
1894 | return -EINVAL; | |
1895 | ||
1896 | inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo); | |
1897 | break; | |
91bc4822 AS |
1898 | case 2: |
1899 | inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); | |
1900 | break; | |
1901 | case 4: | |
1902 | inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo); | |
1903 | break; | |
1904 | default: | |
1905 | return -EINVAL; | |
1906 | } | |
1907 | ||
2f72959a DB |
1908 | if (is_mmzero && !*ptr) |
1909 | *ptr = CSUM_MANGLED_0; | |
91bc4822 AS |
1910 | return 0; |
1911 | } | |
1912 | ||
577c50aa | 1913 | static const struct bpf_func_proto bpf_l4_csum_replace_proto = { |
91bc4822 AS |
1914 | .func = bpf_l4_csum_replace, |
1915 | .gpl_only = false, | |
1916 | .ret_type = RET_INTEGER, | |
1917 | .arg1_type = ARG_PTR_TO_CTX, | |
1918 | .arg2_type = ARG_ANYTHING, | |
1919 | .arg3_type = ARG_ANYTHING, | |
1920 | .arg4_type = ARG_ANYTHING, | |
1921 | .arg5_type = ARG_ANYTHING, | |
608cd71a AS |
1922 | }; |
1923 | ||
f3694e00 DB |
1924 | BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, |
1925 | __be32 *, to, u32, to_size, __wsum, seed) | |
7d672345 | 1926 | { |
21cafc1d | 1927 | struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp); |
f3694e00 | 1928 | u32 diff_size = from_size + to_size; |
7d672345 DB |
1929 | int i, j = 0; |
1930 | ||
1931 | /* This is quite flexible, some examples: | |
1932 | * | |
1933 | * from_size == 0, to_size > 0, seed := csum --> pushing data | |
1934 | * from_size > 0, to_size == 0, seed := csum --> pulling data | |
1935 | * from_size > 0, to_size > 0, seed := 0 --> diffing data | |
1936 | * | |
1937 | * Even for diffing, from_size and to_size don't need to be equal. | |
1938 | */ | |
1939 | if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) || | |
1940 | diff_size > sizeof(sp->diff))) | |
1941 | return -EINVAL; | |
1942 | ||
1943 | for (i = 0; i < from_size / sizeof(__be32); i++, j++) | |
1944 | sp->diff[j] = ~from[i]; | |
1945 | for (i = 0; i < to_size / sizeof(__be32); i++, j++) | |
1946 | sp->diff[j] = to[i]; | |
1947 | ||
1948 | return csum_partial(sp->diff, diff_size, seed); | |
1949 | } | |
1950 | ||
577c50aa | 1951 | static const struct bpf_func_proto bpf_csum_diff_proto = { |
7d672345 DB |
1952 | .func = bpf_csum_diff, |
1953 | .gpl_only = false, | |
36bbef52 | 1954 | .pkt_access = true, |
7d672345 | 1955 | .ret_type = RET_INTEGER, |
db1ac496 | 1956 | .arg1_type = ARG_PTR_TO_MEM_OR_NULL, |
39f19ebb | 1957 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, |
db1ac496 | 1958 | .arg3_type = ARG_PTR_TO_MEM_OR_NULL, |
39f19ebb | 1959 | .arg4_type = ARG_CONST_SIZE_OR_ZERO, |
7d672345 DB |
1960 | .arg5_type = ARG_ANYTHING, |
1961 | }; | |
1962 | ||
36bbef52 DB |
1963 | BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum) |
1964 | { | |
1965 | /* The interface is to be used in combination with bpf_csum_diff() | |
1966 | * for direct packet writes. csum rotation for alignment as well | |
1967 | * as emulating csum_sub() can be done from the eBPF program. | |
1968 | */ | |
1969 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
1970 | return (skb->csum = csum_add(skb->csum, csum)); | |
1971 | ||
1972 | return -ENOTSUPP; | |
1973 | } | |
1974 | ||
1975 | static const struct bpf_func_proto bpf_csum_update_proto = { | |
1976 | .func = bpf_csum_update, | |
1977 | .gpl_only = false, | |
1978 | .ret_type = RET_INTEGER, | |
1979 | .arg1_type = ARG_PTR_TO_CTX, | |
1980 | .arg2_type = ARG_ANYTHING, | |
1981 | }; | |
1982 | ||
a70b506e DB |
1983 | static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb) |
1984 | { | |
a70b506e DB |
1985 | return dev_forward_skb(dev, skb); |
1986 | } | |
1987 | ||
4e3264d2 MKL |
1988 | static inline int __bpf_rx_skb_no_mac(struct net_device *dev, |
1989 | struct sk_buff *skb) | |
1990 | { | |
1991 | int ret = ____dev_forward_skb(dev, skb); | |
1992 | ||
1993 | if (likely(!ret)) { | |
1994 | skb->dev = dev; | |
1995 | ret = netif_rx(skb); | |
1996 | } | |
1997 | ||
1998 | return ret; | |
1999 | } | |
2000 | ||
a70b506e DB |
2001 | static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb) |
2002 | { | |
2003 | int ret; | |
2004 | ||
2005 | if (unlikely(__this_cpu_read(xmit_recursion) > XMIT_RECURSION_LIMIT)) { | |
2006 | net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); | |
2007 | kfree_skb(skb); | |
2008 | return -ENETDOWN; | |
2009 | } | |
2010 | ||
2011 | skb->dev = dev; | |
2012 | ||
2013 | __this_cpu_inc(xmit_recursion); | |
2014 | ret = dev_queue_xmit(skb); | |
2015 | __this_cpu_dec(xmit_recursion); | |
2016 | ||
2017 | return ret; | |
2018 | } | |
2019 | ||
4e3264d2 MKL |
2020 | static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, |
2021 | u32 flags) | |
2022 | { | |
2023 | /* skb->mac_len is not set on normal egress */ | |
2024 | unsigned int mlen = skb->network_header - skb->mac_header; | |
2025 | ||
2026 | __skb_pull(skb, mlen); | |
2027 | ||
2028 | /* At ingress, the mac header has already been pulled once. | |
2029 | * At egress, skb_pospull_rcsum has to be done in case that | |
2030 | * the skb is originated from ingress (i.e. a forwarded skb) | |
2031 | * to ensure that rcsum starts at net header. | |
2032 | */ | |
2033 | if (!skb_at_tc_ingress(skb)) | |
2034 | skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); | |
2035 | skb_pop_mac_header(skb); | |
2036 | skb_reset_mac_len(skb); | |
2037 | return flags & BPF_F_INGRESS ? | |
2038 | __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); | |
2039 | } | |
2040 | ||
2041 | static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, | |
2042 | u32 flags) | |
2043 | { | |
3a0af8fd TG |
2044 | /* Verify that a link layer header is carried */ |
2045 | if (unlikely(skb->mac_header >= skb->network_header)) { | |
2046 | kfree_skb(skb); | |
2047 | return -ERANGE; | |
2048 | } | |
2049 | ||
4e3264d2 MKL |
2050 | bpf_push_mac_rcsum(skb); |
2051 | return flags & BPF_F_INGRESS ? | |
2052 | __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); | |
2053 | } | |
2054 | ||
2055 | static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, | |
2056 | u32 flags) | |
2057 | { | |
c491680f | 2058 | if (dev_is_mac_header_xmit(dev)) |
4e3264d2 | 2059 | return __bpf_redirect_common(skb, dev, flags); |
c491680f DB |
2060 | else |
2061 | return __bpf_redirect_no_mac(skb, dev, flags); | |
4e3264d2 MKL |
2062 | } |
2063 | ||
f3694e00 | 2064 | BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) |
3896d655 | 2065 | { |
3896d655 | 2066 | struct net_device *dev; |
36bbef52 DB |
2067 | struct sk_buff *clone; |
2068 | int ret; | |
3896d655 | 2069 | |
781c53bc DB |
2070 | if (unlikely(flags & ~(BPF_F_INGRESS))) |
2071 | return -EINVAL; | |
2072 | ||
3896d655 AS |
2073 | dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); |
2074 | if (unlikely(!dev)) | |
2075 | return -EINVAL; | |
2076 | ||
36bbef52 DB |
2077 | clone = skb_clone(skb, GFP_ATOMIC); |
2078 | if (unlikely(!clone)) | |
3896d655 AS |
2079 | return -ENOMEM; |
2080 | ||
36bbef52 DB |
2081 | /* For direct write, we need to keep the invariant that the skbs |
2082 | * we're dealing with need to be uncloned. Should uncloning fail | |
2083 | * here, we need to free the just generated clone to unclone once | |
2084 | * again. | |
2085 | */ | |
2086 | ret = bpf_try_make_head_writable(skb); | |
2087 | if (unlikely(ret)) { | |
2088 | kfree_skb(clone); | |
2089 | return -ENOMEM; | |
2090 | } | |
2091 | ||
4e3264d2 | 2092 | return __bpf_redirect(clone, dev, flags); |
3896d655 AS |
2093 | } |
2094 | ||
577c50aa | 2095 | static const struct bpf_func_proto bpf_clone_redirect_proto = { |
3896d655 AS |
2096 | .func = bpf_clone_redirect, |
2097 | .gpl_only = false, | |
2098 | .ret_type = RET_INTEGER, | |
2099 | .arg1_type = ARG_PTR_TO_CTX, | |
2100 | .arg2_type = ARG_ANYTHING, | |
2101 | .arg3_type = ARG_ANYTHING, | |
2102 | }; | |
2103 | ||
0b19cc0a TM |
2104 | DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info); |
2105 | EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info); | |
781c53bc | 2106 | |
f3694e00 | 2107 | BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) |
27b29f63 | 2108 | { |
0b19cc0a | 2109 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
27b29f63 | 2110 | |
781c53bc DB |
2111 | if (unlikely(flags & ~(BPF_F_INGRESS))) |
2112 | return TC_ACT_SHOT; | |
2113 | ||
27b29f63 AS |
2114 | ri->ifindex = ifindex; |
2115 | ri->flags = flags; | |
781c53bc | 2116 | |
27b29f63 AS |
2117 | return TC_ACT_REDIRECT; |
2118 | } | |
2119 | ||
2120 | int skb_do_redirect(struct sk_buff *skb) | |
2121 | { | |
0b19cc0a | 2122 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
27b29f63 AS |
2123 | struct net_device *dev; |
2124 | ||
2125 | dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->ifindex); | |
2126 | ri->ifindex = 0; | |
2127 | if (unlikely(!dev)) { | |
2128 | kfree_skb(skb); | |
2129 | return -EINVAL; | |
2130 | } | |
2131 | ||
4e3264d2 | 2132 | return __bpf_redirect(skb, dev, ri->flags); |
27b29f63 AS |
2133 | } |
2134 | ||
577c50aa | 2135 | static const struct bpf_func_proto bpf_redirect_proto = { |
27b29f63 AS |
2136 | .func = bpf_redirect, |
2137 | .gpl_only = false, | |
2138 | .ret_type = RET_INTEGER, | |
2139 | .arg1_type = ARG_ANYTHING, | |
2140 | .arg2_type = ARG_ANYTHING, | |
2141 | }; | |
2142 | ||
604326b4 | 2143 | BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes) |
2a100317 JF |
2144 | { |
2145 | msg->apply_bytes = bytes; | |
2146 | return 0; | |
2147 | } | |
2148 | ||
2149 | static const struct bpf_func_proto bpf_msg_apply_bytes_proto = { | |
2150 | .func = bpf_msg_apply_bytes, | |
2151 | .gpl_only = false, | |
2152 | .ret_type = RET_INTEGER, | |
2153 | .arg1_type = ARG_PTR_TO_CTX, | |
2154 | .arg2_type = ARG_ANYTHING, | |
2155 | }; | |
2156 | ||
604326b4 | 2157 | BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes) |
91843d54 JF |
2158 | { |
2159 | msg->cork_bytes = bytes; | |
2160 | return 0; | |
2161 | } | |
2162 | ||
2163 | static const struct bpf_func_proto bpf_msg_cork_bytes_proto = { | |
2164 | .func = bpf_msg_cork_bytes, | |
2165 | .gpl_only = false, | |
2166 | .ret_type = RET_INTEGER, | |
2167 | .arg1_type = ARG_PTR_TO_CTX, | |
2168 | .arg2_type = ARG_ANYTHING, | |
2169 | }; | |
2170 | ||
604326b4 DB |
2171 | BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start, |
2172 | u32, end, u64, flags) | |
015632bb | 2173 | { |
604326b4 DB |
2174 | u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start; |
2175 | u32 first_sge, last_sge, i, shift, bytes_sg_total; | |
2176 | struct scatterlist *sge; | |
2177 | u8 *raw, *to, *from; | |
015632bb JF |
2178 | struct page *page; |
2179 | ||
2180 | if (unlikely(flags || end <= start)) | |
2181 | return -EINVAL; | |
2182 | ||
2183 | /* First find the starting scatterlist element */ | |
604326b4 | 2184 | i = msg->sg.start; |
015632bb | 2185 | do { |
604326b4 | 2186 | len = sk_msg_elem(msg, i)->length; |
015632bb JF |
2187 | if (start < offset + len) |
2188 | break; | |
5b24109b | 2189 | offset += len; |
604326b4 DB |
2190 | sk_msg_iter_var_next(i); |
2191 | } while (i != msg->sg.end); | |
015632bb JF |
2192 | |
2193 | if (unlikely(start >= offset + len)) | |
2194 | return -EINVAL; | |
2195 | ||
604326b4 | 2196 | first_sge = i; |
5b24109b DB |
2197 | /* The start may point into the sg element so we need to also |
2198 | * account for the headroom. | |
2199 | */ | |
2200 | bytes_sg_total = start - offset + bytes; | |
604326b4 | 2201 | if (!msg->sg.copy[i] && bytes_sg_total <= len) |
015632bb | 2202 | goto out; |
015632bb JF |
2203 | |
2204 | /* At this point we need to linearize multiple scatterlist | |
2205 | * elements or a single shared page. Either way we need to | |
2206 | * copy into a linear buffer exclusively owned by BPF. Then | |
2207 | * place the buffer in the scatterlist and fixup the original | |
2208 | * entries by removing the entries now in the linear buffer | |
2209 | * and shifting the remaining entries. For now we do not try | |
2210 | * to copy partial entries to avoid complexity of running out | |
2211 | * of sg_entry slots. The downside is reading a single byte | |
2212 | * will copy the entire sg entry. | |
2213 | */ | |
2214 | do { | |
604326b4 DB |
2215 | copy += sk_msg_elem(msg, i)->length; |
2216 | sk_msg_iter_var_next(i); | |
5b24109b | 2217 | if (bytes_sg_total <= copy) |
015632bb | 2218 | break; |
604326b4 DB |
2219 | } while (i != msg->sg.end); |
2220 | last_sge = i; | |
015632bb | 2221 | |
5b24109b | 2222 | if (unlikely(bytes_sg_total > copy)) |
015632bb JF |
2223 | return -EINVAL; |
2224 | ||
4c3d795c TD |
2225 | page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, |
2226 | get_order(copy)); | |
015632bb JF |
2227 | if (unlikely(!page)) |
2228 | return -ENOMEM; | |
015632bb | 2229 | |
604326b4 DB |
2230 | raw = page_address(page); |
2231 | i = first_sge; | |
015632bb | 2232 | do { |
604326b4 DB |
2233 | sge = sk_msg_elem(msg, i); |
2234 | from = sg_virt(sge); | |
2235 | len = sge->length; | |
2236 | to = raw + poffset; | |
015632bb JF |
2237 | |
2238 | memcpy(to, from, len); | |
9db39f4d | 2239 | poffset += len; |
604326b4 DB |
2240 | sge->length = 0; |
2241 | put_page(sg_page(sge)); | |
015632bb | 2242 | |
604326b4 DB |
2243 | sk_msg_iter_var_next(i); |
2244 | } while (i != last_sge); | |
015632bb | 2245 | |
604326b4 | 2246 | sg_set_page(&msg->sg.data[first_sge], page, copy, 0); |
015632bb JF |
2247 | |
2248 | /* To repair sg ring we need to shift entries. If we only | |
2249 | * had a single entry though we can just replace it and | |
2250 | * be done. Otherwise walk the ring and shift the entries. | |
2251 | */ | |
604326b4 DB |
2252 | WARN_ON_ONCE(last_sge == first_sge); |
2253 | shift = last_sge > first_sge ? | |
2254 | last_sge - first_sge - 1 : | |
2255 | MAX_SKB_FRAGS - first_sge + last_sge - 1; | |
015632bb JF |
2256 | if (!shift) |
2257 | goto out; | |
2258 | ||
604326b4 DB |
2259 | i = first_sge; |
2260 | sk_msg_iter_var_next(i); | |
015632bb | 2261 | do { |
604326b4 | 2262 | u32 move_from; |
015632bb | 2263 | |
604326b4 DB |
2264 | if (i + shift >= MAX_MSG_FRAGS) |
2265 | move_from = i + shift - MAX_MSG_FRAGS; | |
015632bb JF |
2266 | else |
2267 | move_from = i + shift; | |
604326b4 | 2268 | if (move_from == msg->sg.end) |
015632bb JF |
2269 | break; |
2270 | ||
604326b4 DB |
2271 | msg->sg.data[i] = msg->sg.data[move_from]; |
2272 | msg->sg.data[move_from].length = 0; | |
2273 | msg->sg.data[move_from].page_link = 0; | |
2274 | msg->sg.data[move_from].offset = 0; | |
2275 | sk_msg_iter_var_next(i); | |
015632bb | 2276 | } while (1); |
604326b4 DB |
2277 | |
2278 | msg->sg.end = msg->sg.end - shift > msg->sg.end ? | |
2279 | msg->sg.end - shift + MAX_MSG_FRAGS : | |
2280 | msg->sg.end - shift; | |
015632bb | 2281 | out: |
604326b4 | 2282 | msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset; |
015632bb | 2283 | msg->data_end = msg->data + bytes; |
015632bb JF |
2284 | return 0; |
2285 | } | |
2286 | ||
2287 | static const struct bpf_func_proto bpf_msg_pull_data_proto = { | |
2288 | .func = bpf_msg_pull_data, | |
2289 | .gpl_only = false, | |
2290 | .ret_type = RET_INTEGER, | |
2291 | .arg1_type = ARG_PTR_TO_CTX, | |
2292 | .arg2_type = ARG_ANYTHING, | |
2293 | .arg3_type = ARG_ANYTHING, | |
2294 | .arg4_type = ARG_ANYTHING, | |
2295 | }; | |
2296 | ||
6fff607e JF |
2297 | BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start, |
2298 | u32, len, u64, flags) | |
2299 | { | |
2300 | struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge; | |
2301 | u32 new, i = 0, l, space, copy = 0, offset = 0; | |
2302 | u8 *raw, *to, *from; | |
2303 | struct page *page; | |
2304 | ||
2305 | if (unlikely(flags)) | |
2306 | return -EINVAL; | |
2307 | ||
2308 | /* First find the starting scatterlist element */ | |
2309 | i = msg->sg.start; | |
2310 | do { | |
2311 | l = sk_msg_elem(msg, i)->length; | |
2312 | ||
2313 | if (start < offset + l) | |
2314 | break; | |
2315 | offset += l; | |
2316 | sk_msg_iter_var_next(i); | |
2317 | } while (i != msg->sg.end); | |
2318 | ||
2319 | if (start >= offset + l) | |
2320 | return -EINVAL; | |
2321 | ||
2322 | space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); | |
2323 | ||
2324 | /* If no space available will fallback to copy, we need at | |
2325 | * least one scatterlist elem available to push data into | |
2326 | * when start aligns to the beginning of an element or two | |
2327 | * when it falls inside an element. We handle the start equals | |
2328 | * offset case because its the common case for inserting a | |
2329 | * header. | |
2330 | */ | |
2331 | if (!space || (space == 1 && start != offset)) | |
2332 | copy = msg->sg.data[i].length; | |
2333 | ||
2334 | page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, | |
2335 | get_order(copy + len)); | |
2336 | if (unlikely(!page)) | |
2337 | return -ENOMEM; | |
2338 | ||
2339 | if (copy) { | |
2340 | int front, back; | |
2341 | ||
2342 | raw = page_address(page); | |
2343 | ||
2344 | psge = sk_msg_elem(msg, i); | |
2345 | front = start - offset; | |
2346 | back = psge->length - front; | |
2347 | from = sg_virt(psge); | |
2348 | ||
2349 | if (front) | |
2350 | memcpy(raw, from, front); | |
2351 | ||
2352 | if (back) { | |
2353 | from += front; | |
2354 | to = raw + front + len; | |
2355 | ||
2356 | memcpy(to, from, back); | |
2357 | } | |
2358 | ||
2359 | put_page(sg_page(psge)); | |
2360 | } else if (start - offset) { | |
2361 | psge = sk_msg_elem(msg, i); | |
2362 | rsge = sk_msg_elem_cpy(msg, i); | |
2363 | ||
2364 | psge->length = start - offset; | |
2365 | rsge.length -= psge->length; | |
2366 | rsge.offset += start; | |
2367 | ||
2368 | sk_msg_iter_var_next(i); | |
2369 | sg_unmark_end(psge); | |
2370 | sk_msg_iter_next(msg, end); | |
2371 | } | |
2372 | ||
2373 | /* Slot(s) to place newly allocated data */ | |
2374 | new = i; | |
2375 | ||
2376 | /* Shift one or two slots as needed */ | |
2377 | if (!copy) { | |
2378 | sge = sk_msg_elem_cpy(msg, i); | |
2379 | ||
2380 | sk_msg_iter_var_next(i); | |
2381 | sg_unmark_end(&sge); | |
2382 | sk_msg_iter_next(msg, end); | |
2383 | ||
2384 | nsge = sk_msg_elem_cpy(msg, i); | |
2385 | if (rsge.length) { | |
2386 | sk_msg_iter_var_next(i); | |
2387 | nnsge = sk_msg_elem_cpy(msg, i); | |
2388 | } | |
2389 | ||
2390 | while (i != msg->sg.end) { | |
2391 | msg->sg.data[i] = sge; | |
2392 | sge = nsge; | |
2393 | sk_msg_iter_var_next(i); | |
2394 | if (rsge.length) { | |
2395 | nsge = nnsge; | |
2396 | nnsge = sk_msg_elem_cpy(msg, i); | |
2397 | } else { | |
2398 | nsge = sk_msg_elem_cpy(msg, i); | |
2399 | } | |
2400 | } | |
2401 | } | |
2402 | ||
2403 | /* Place newly allocated data buffer */ | |
2404 | sk_mem_charge(msg->sk, len); | |
2405 | msg->sg.size += len; | |
2406 | msg->sg.copy[new] = false; | |
2407 | sg_set_page(&msg->sg.data[new], page, len + copy, 0); | |
2408 | if (rsge.length) { | |
2409 | get_page(sg_page(&rsge)); | |
2410 | sk_msg_iter_var_next(new); | |
2411 | msg->sg.data[new] = rsge; | |
2412 | } | |
2413 | ||
2414 | sk_msg_compute_data_pointers(msg); | |
2415 | return 0; | |
2416 | } | |
2417 | ||
2418 | static const struct bpf_func_proto bpf_msg_push_data_proto = { | |
2419 | .func = bpf_msg_push_data, | |
2420 | .gpl_only = false, | |
2421 | .ret_type = RET_INTEGER, | |
2422 | .arg1_type = ARG_PTR_TO_CTX, | |
2423 | .arg2_type = ARG_ANYTHING, | |
2424 | .arg3_type = ARG_ANYTHING, | |
2425 | .arg4_type = ARG_ANYTHING, | |
2426 | }; | |
2427 | ||
7246d8ed JF |
2428 | static void sk_msg_shift_left(struct sk_msg *msg, int i) |
2429 | { | |
2430 | int prev; | |
2431 | ||
2432 | do { | |
2433 | prev = i; | |
2434 | sk_msg_iter_var_next(i); | |
2435 | msg->sg.data[prev] = msg->sg.data[i]; | |
2436 | } while (i != msg->sg.end); | |
2437 | ||
2438 | sk_msg_iter_prev(msg, end); | |
2439 | } | |
2440 | ||
2441 | static void sk_msg_shift_right(struct sk_msg *msg, int i) | |
2442 | { | |
2443 | struct scatterlist tmp, sge; | |
2444 | ||
2445 | sk_msg_iter_next(msg, end); | |
2446 | sge = sk_msg_elem_cpy(msg, i); | |
2447 | sk_msg_iter_var_next(i); | |
2448 | tmp = sk_msg_elem_cpy(msg, i); | |
2449 | ||
2450 | while (i != msg->sg.end) { | |
2451 | msg->sg.data[i] = sge; | |
2452 | sk_msg_iter_var_next(i); | |
2453 | sge = tmp; | |
2454 | tmp = sk_msg_elem_cpy(msg, i); | |
2455 | } | |
2456 | } | |
2457 | ||
2458 | BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start, | |
2459 | u32, len, u64, flags) | |
2460 | { | |
2461 | u32 i = 0, l, space, offset = 0; | |
2462 | u64 last = start + len; | |
2463 | int pop; | |
2464 | ||
2465 | if (unlikely(flags)) | |
2466 | return -EINVAL; | |
2467 | ||
2468 | /* First find the starting scatterlist element */ | |
2469 | i = msg->sg.start; | |
2470 | do { | |
2471 | l = sk_msg_elem(msg, i)->length; | |
2472 | ||
2473 | if (start < offset + l) | |
2474 | break; | |
2475 | offset += l; | |
2476 | sk_msg_iter_var_next(i); | |
2477 | } while (i != msg->sg.end); | |
2478 | ||
2479 | /* Bounds checks: start and pop must be inside message */ | |
2480 | if (start >= offset + l || last >= msg->sg.size) | |
2481 | return -EINVAL; | |
2482 | ||
2483 | space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); | |
2484 | ||
2485 | pop = len; | |
2486 | /* --------------| offset | |
2487 | * -| start |-------- len -------| | |
2488 | * | |
2489 | * |----- a ----|-------- pop -------|----- b ----| | |
2490 | * |______________________________________________| length | |
2491 | * | |
2492 | * | |
2493 | * a: region at front of scatter element to save | |
2494 | * b: region at back of scatter element to save when length > A + pop | |
2495 | * pop: region to pop from element, same as input 'pop' here will be | |
2496 | * decremented below per iteration. | |
2497 | * | |
2498 | * Two top-level cases to handle when start != offset, first B is non | |
2499 | * zero and second B is zero corresponding to when a pop includes more | |
2500 | * than one element. | |
2501 | * | |
2502 | * Then if B is non-zero AND there is no space allocate space and | |
2503 | * compact A, B regions into page. If there is space shift ring to | |
2504 | * the rigth free'ing the next element in ring to place B, leaving | |
2505 | * A untouched except to reduce length. | |
2506 | */ | |
2507 | if (start != offset) { | |
2508 | struct scatterlist *nsge, *sge = sk_msg_elem(msg, i); | |
2509 | int a = start; | |
2510 | int b = sge->length - pop - a; | |
2511 | ||
2512 | sk_msg_iter_var_next(i); | |
2513 | ||
2514 | if (pop < sge->length - a) { | |
2515 | if (space) { | |
2516 | sge->length = a; | |
2517 | sk_msg_shift_right(msg, i); | |
2518 | nsge = sk_msg_elem(msg, i); | |
2519 | get_page(sg_page(sge)); | |
2520 | sg_set_page(nsge, | |
2521 | sg_page(sge), | |
2522 | b, sge->offset + pop + a); | |
2523 | } else { | |
2524 | struct page *page, *orig; | |
2525 | u8 *to, *from; | |
2526 | ||
2527 | page = alloc_pages(__GFP_NOWARN | | |
2528 | __GFP_COMP | GFP_ATOMIC, | |
2529 | get_order(a + b)); | |
2530 | if (unlikely(!page)) | |
2531 | return -ENOMEM; | |
2532 | ||
2533 | sge->length = a; | |
2534 | orig = sg_page(sge); | |
2535 | from = sg_virt(sge); | |
2536 | to = page_address(page); | |
2537 | memcpy(to, from, a); | |
2538 | memcpy(to + a, from + a + pop, b); | |
2539 | sg_set_page(sge, page, a + b, 0); | |
2540 | put_page(orig); | |
2541 | } | |
2542 | pop = 0; | |
2543 | } else if (pop >= sge->length - a) { | |
2544 | sge->length = a; | |
2545 | pop -= (sge->length - a); | |
2546 | } | |
2547 | } | |
2548 | ||
2549 | /* From above the current layout _must_ be as follows, | |
2550 | * | |
2551 | * -| offset | |
2552 | * -| start | |
2553 | * | |
2554 | * |---- pop ---|---------------- b ------------| | |
2555 | * |____________________________________________| length | |
2556 | * | |
2557 | * Offset and start of the current msg elem are equal because in the | |
2558 | * previous case we handled offset != start and either consumed the | |
2559 | * entire element and advanced to the next element OR pop == 0. | |
2560 | * | |
2561 | * Two cases to handle here are first pop is less than the length | |
2562 | * leaving some remainder b above. Simply adjust the element's layout | |
2563 | * in this case. Or pop >= length of the element so that b = 0. In this | |
2564 | * case advance to next element decrementing pop. | |
2565 | */ | |
2566 | while (pop) { | |
2567 | struct scatterlist *sge = sk_msg_elem(msg, i); | |
2568 | ||
2569 | if (pop < sge->length) { | |
2570 | sge->length -= pop; | |
2571 | sge->offset += pop; | |
2572 | pop = 0; | |
2573 | } else { | |
2574 | pop -= sge->length; | |
2575 | sk_msg_shift_left(msg, i); | |
2576 | } | |
2577 | sk_msg_iter_var_next(i); | |
2578 | } | |
2579 | ||
2580 | sk_mem_uncharge(msg->sk, len - pop); | |
2581 | msg->sg.size -= (len - pop); | |
2582 | sk_msg_compute_data_pointers(msg); | |
2583 | return 0; | |
2584 | } | |
2585 | ||
2586 | static const struct bpf_func_proto bpf_msg_pop_data_proto = { | |
2587 | .func = bpf_msg_pop_data, | |
2588 | .gpl_only = false, | |
2589 | .ret_type = RET_INTEGER, | |
2590 | .arg1_type = ARG_PTR_TO_CTX, | |
2591 | .arg2_type = ARG_ANYTHING, | |
2592 | .arg3_type = ARG_ANYTHING, | |
2593 | .arg4_type = ARG_ANYTHING, | |
2594 | }; | |
2595 | ||
f3694e00 | 2596 | BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) |
8d20aabe | 2597 | { |
f3694e00 | 2598 | return task_get_classid(skb); |
8d20aabe DB |
2599 | } |
2600 | ||
2601 | static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { | |
2602 | .func = bpf_get_cgroup_classid, | |
2603 | .gpl_only = false, | |
2604 | .ret_type = RET_INTEGER, | |
2605 | .arg1_type = ARG_PTR_TO_CTX, | |
2606 | }; | |
2607 | ||
f3694e00 | 2608 | BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) |
c46646d0 | 2609 | { |
f3694e00 | 2610 | return dst_tclassid(skb); |
c46646d0 DB |
2611 | } |
2612 | ||
2613 | static const struct bpf_func_proto bpf_get_route_realm_proto = { | |
2614 | .func = bpf_get_route_realm, | |
2615 | .gpl_only = false, | |
2616 | .ret_type = RET_INTEGER, | |
2617 | .arg1_type = ARG_PTR_TO_CTX, | |
2618 | }; | |
2619 | ||
f3694e00 | 2620 | BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) |
13c5c240 DB |
2621 | { |
2622 | /* If skb_clear_hash() was called due to mangling, we can | |
2623 | * trigger SW recalculation here. Later access to hash | |
2624 | * can then use the inline skb->hash via context directly | |
2625 | * instead of calling this helper again. | |
2626 | */ | |
f3694e00 | 2627 | return skb_get_hash(skb); |
13c5c240 DB |
2628 | } |
2629 | ||
2630 | static const struct bpf_func_proto bpf_get_hash_recalc_proto = { | |
2631 | .func = bpf_get_hash_recalc, | |
2632 | .gpl_only = false, | |
2633 | .ret_type = RET_INTEGER, | |
2634 | .arg1_type = ARG_PTR_TO_CTX, | |
2635 | }; | |
2636 | ||
7a4b28c6 DB |
2637 | BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) |
2638 | { | |
2639 | /* After all direct packet write, this can be used once for | |
2640 | * triggering a lazy recalc on next skb_get_hash() invocation. | |
2641 | */ | |
2642 | skb_clear_hash(skb); | |
2643 | return 0; | |
2644 | } | |
2645 | ||
2646 | static const struct bpf_func_proto bpf_set_hash_invalid_proto = { | |
2647 | .func = bpf_set_hash_invalid, | |
2648 | .gpl_only = false, | |
2649 | .ret_type = RET_INTEGER, | |
2650 | .arg1_type = ARG_PTR_TO_CTX, | |
2651 | }; | |
2652 | ||
ded092cd DB |
2653 | BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) |
2654 | { | |
2655 | /* Set user specified hash as L4(+), so that it gets returned | |
2656 | * on skb_get_hash() call unless BPF prog later on triggers a | |
2657 | * skb_clear_hash(). | |
2658 | */ | |
2659 | __skb_set_sw_hash(skb, hash, true); | |
2660 | return 0; | |
2661 | } | |
2662 | ||
2663 | static const struct bpf_func_proto bpf_set_hash_proto = { | |
2664 | .func = bpf_set_hash, | |
2665 | .gpl_only = false, | |
2666 | .ret_type = RET_INTEGER, | |
2667 | .arg1_type = ARG_PTR_TO_CTX, | |
2668 | .arg2_type = ARG_ANYTHING, | |
2669 | }; | |
2670 | ||
f3694e00 DB |
2671 | BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, |
2672 | u16, vlan_tci) | |
4e10df9a | 2673 | { |
db58ba45 | 2674 | int ret; |
4e10df9a AS |
2675 | |
2676 | if (unlikely(vlan_proto != htons(ETH_P_8021Q) && | |
2677 | vlan_proto != htons(ETH_P_8021AD))) | |
2678 | vlan_proto = htons(ETH_P_8021Q); | |
2679 | ||
8065694e | 2680 | bpf_push_mac_rcsum(skb); |
db58ba45 | 2681 | ret = skb_vlan_push(skb, vlan_proto, vlan_tci); |
8065694e DB |
2682 | bpf_pull_mac_rcsum(skb); |
2683 | ||
6aaae2b6 | 2684 | bpf_compute_data_pointers(skb); |
db58ba45 | 2685 | return ret; |
4e10df9a AS |
2686 | } |
2687 | ||
93731ef0 | 2688 | static const struct bpf_func_proto bpf_skb_vlan_push_proto = { |
4e10df9a AS |
2689 | .func = bpf_skb_vlan_push, |
2690 | .gpl_only = false, | |
2691 | .ret_type = RET_INTEGER, | |
2692 | .arg1_type = ARG_PTR_TO_CTX, | |
2693 | .arg2_type = ARG_ANYTHING, | |
2694 | .arg3_type = ARG_ANYTHING, | |
2695 | }; | |
2696 | ||
f3694e00 | 2697 | BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) |
4e10df9a | 2698 | { |
db58ba45 | 2699 | int ret; |
4e10df9a | 2700 | |
8065694e | 2701 | bpf_push_mac_rcsum(skb); |
db58ba45 | 2702 | ret = skb_vlan_pop(skb); |
8065694e DB |
2703 | bpf_pull_mac_rcsum(skb); |
2704 | ||
6aaae2b6 | 2705 | bpf_compute_data_pointers(skb); |
db58ba45 | 2706 | return ret; |
4e10df9a AS |
2707 | } |
2708 | ||
93731ef0 | 2709 | static const struct bpf_func_proto bpf_skb_vlan_pop_proto = { |
4e10df9a AS |
2710 | .func = bpf_skb_vlan_pop, |
2711 | .gpl_only = false, | |
2712 | .ret_type = RET_INTEGER, | |
2713 | .arg1_type = ARG_PTR_TO_CTX, | |
2714 | }; | |
2715 | ||
6578171a DB |
2716 | static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) |
2717 | { | |
2718 | /* Caller already did skb_cow() with len as headroom, | |
2719 | * so no need to do it here. | |
2720 | */ | |
2721 | skb_push(skb, len); | |
2722 | memmove(skb->data, skb->data + len, off); | |
2723 | memset(skb->data + off, 0, len); | |
2724 | ||
2725 | /* No skb_postpush_rcsum(skb, skb->data + off, len) | |
2726 | * needed here as it does not change the skb->csum | |
2727 | * result for checksum complete when summing over | |
2728 | * zeroed blocks. | |
2729 | */ | |
2730 | return 0; | |
2731 | } | |
2732 | ||
2733 | static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) | |
2734 | { | |
2735 | /* skb_ensure_writable() is not needed here, as we're | |
2736 | * already working on an uncloned skb. | |
2737 | */ | |
2738 | if (unlikely(!pskb_may_pull(skb, off + len))) | |
2739 | return -ENOMEM; | |
2740 | ||
2741 | skb_postpull_rcsum(skb, skb->data + off, len); | |
2742 | memmove(skb->data + len, skb->data, off); | |
2743 | __skb_pull(skb, len); | |
2744 | ||
2745 | return 0; | |
2746 | } | |
2747 | ||
2748 | static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) | |
2749 | { | |
2750 | bool trans_same = skb->transport_header == skb->network_header; | |
2751 | int ret; | |
2752 | ||
2753 | /* There's no need for __skb_push()/__skb_pull() pair to | |
2754 | * get to the start of the mac header as we're guaranteed | |
2755 | * to always start from here under eBPF. | |
2756 | */ | |
2757 | ret = bpf_skb_generic_push(skb, off, len); | |
2758 | if (likely(!ret)) { | |
2759 | skb->mac_header -= len; | |
2760 | skb->network_header -= len; | |
2761 | if (trans_same) | |
2762 | skb->transport_header = skb->network_header; | |
2763 | } | |
2764 | ||
2765 | return ret; | |
2766 | } | |
2767 | ||
2768 | static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) | |
2769 | { | |
2770 | bool trans_same = skb->transport_header == skb->network_header; | |
2771 | int ret; | |
2772 | ||
2773 | /* Same here, __skb_push()/__skb_pull() pair not needed. */ | |
2774 | ret = bpf_skb_generic_pop(skb, off, len); | |
2775 | if (likely(!ret)) { | |
2776 | skb->mac_header += len; | |
2777 | skb->network_header += len; | |
2778 | if (trans_same) | |
2779 | skb->transport_header = skb->network_header; | |
2780 | } | |
2781 | ||
2782 | return ret; | |
2783 | } | |
2784 | ||
2785 | static int bpf_skb_proto_4_to_6(struct sk_buff *skb) | |
2786 | { | |
2787 | const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); | |
0daf4349 | 2788 | u32 off = skb_mac_header_len(skb); |
6578171a DB |
2789 | int ret; |
2790 | ||
d02f51cb DA |
2791 | /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */ |
2792 | if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb))) | |
2793 | return -ENOTSUPP; | |
2794 | ||
6578171a DB |
2795 | ret = skb_cow(skb, len_diff); |
2796 | if (unlikely(ret < 0)) | |
2797 | return ret; | |
2798 | ||
2799 | ret = bpf_skb_net_hdr_push(skb, off, len_diff); | |
2800 | if (unlikely(ret < 0)) | |
2801 | return ret; | |
2802 | ||
2803 | if (skb_is_gso(skb)) { | |
d02f51cb DA |
2804 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
2805 | ||
880388aa DM |
2806 | /* SKB_GSO_TCPV4 needs to be changed into |
2807 | * SKB_GSO_TCPV6. | |
6578171a | 2808 | */ |
d02f51cb DA |
2809 | if (shinfo->gso_type & SKB_GSO_TCPV4) { |
2810 | shinfo->gso_type &= ~SKB_GSO_TCPV4; | |
2811 | shinfo->gso_type |= SKB_GSO_TCPV6; | |
6578171a DB |
2812 | } |
2813 | ||
2814 | /* Due to IPv6 header, MSS needs to be downgraded. */ | |
d02f51cb | 2815 | skb_decrease_gso_size(shinfo, len_diff); |
6578171a | 2816 | /* Header must be checked, and gso_segs recomputed. */ |
d02f51cb DA |
2817 | shinfo->gso_type |= SKB_GSO_DODGY; |
2818 | shinfo->gso_segs = 0; | |
6578171a DB |
2819 | } |
2820 | ||
2821 | skb->protocol = htons(ETH_P_IPV6); | |
2822 | skb_clear_hash(skb); | |
2823 | ||
2824 | return 0; | |
2825 | } | |
2826 | ||
2827 | static int bpf_skb_proto_6_to_4(struct sk_buff *skb) | |
2828 | { | |
2829 | const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); | |
0daf4349 | 2830 | u32 off = skb_mac_header_len(skb); |
6578171a DB |
2831 | int ret; |
2832 | ||
d02f51cb DA |
2833 | /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */ |
2834 | if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb))) | |
2835 | return -ENOTSUPP; | |
2836 | ||
6578171a DB |
2837 | ret = skb_unclone(skb, GFP_ATOMIC); |
2838 | if (unlikely(ret < 0)) | |
2839 | return ret; | |
2840 | ||
2841 | ret = bpf_skb_net_hdr_pop(skb, off, len_diff); | |
2842 | if (unlikely(ret < 0)) | |
2843 | return ret; | |
2844 | ||
2845 | if (skb_is_gso(skb)) { | |
d02f51cb DA |
2846 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
2847 | ||
880388aa DM |
2848 | /* SKB_GSO_TCPV6 needs to be changed into |
2849 | * SKB_GSO_TCPV4. | |
6578171a | 2850 | */ |
d02f51cb DA |
2851 | if (shinfo->gso_type & SKB_GSO_TCPV6) { |
2852 | shinfo->gso_type &= ~SKB_GSO_TCPV6; | |
2853 | shinfo->gso_type |= SKB_GSO_TCPV4; | |
6578171a DB |
2854 | } |
2855 | ||
2856 | /* Due to IPv4 header, MSS can be upgraded. */ | |
d02f51cb | 2857 | skb_increase_gso_size(shinfo, len_diff); |
6578171a | 2858 | /* Header must be checked, and gso_segs recomputed. */ |
d02f51cb DA |
2859 | shinfo->gso_type |= SKB_GSO_DODGY; |
2860 | shinfo->gso_segs = 0; | |
6578171a DB |
2861 | } |
2862 | ||
2863 | skb->protocol = htons(ETH_P_IP); | |
2864 | skb_clear_hash(skb); | |
2865 | ||
2866 | return 0; | |
2867 | } | |
2868 | ||
2869 | static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) | |
2870 | { | |
2871 | __be16 from_proto = skb->protocol; | |
2872 | ||
2873 | if (from_proto == htons(ETH_P_IP) && | |
2874 | to_proto == htons(ETH_P_IPV6)) | |
2875 | return bpf_skb_proto_4_to_6(skb); | |
2876 | ||
2877 | if (from_proto == htons(ETH_P_IPV6) && | |
2878 | to_proto == htons(ETH_P_IP)) | |
2879 | return bpf_skb_proto_6_to_4(skb); | |
2880 | ||
2881 | return -ENOTSUPP; | |
2882 | } | |
2883 | ||
f3694e00 DB |
2884 | BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, |
2885 | u64, flags) | |
6578171a | 2886 | { |
6578171a DB |
2887 | int ret; |
2888 | ||
2889 | if (unlikely(flags)) | |
2890 | return -EINVAL; | |
2891 | ||
2892 | /* General idea is that this helper does the basic groundwork | |
2893 | * needed for changing the protocol, and eBPF program fills the | |
2894 | * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() | |
2895 | * and other helpers, rather than passing a raw buffer here. | |
2896 | * | |
2897 | * The rationale is to keep this minimal and without a need to | |
2898 | * deal with raw packet data. F.e. even if we would pass buffers | |
2899 | * here, the program still needs to call the bpf_lX_csum_replace() | |
2900 | * helpers anyway. Plus, this way we keep also separation of | |
2901 | * concerns, since f.e. bpf_skb_store_bytes() should only take | |
2902 | * care of stores. | |
2903 | * | |
2904 | * Currently, additional options and extension header space are | |
2905 | * not supported, but flags register is reserved so we can adapt | |
2906 | * that. For offloads, we mark packet as dodgy, so that headers | |
2907 | * need to be verified first. | |
2908 | */ | |
2909 | ret = bpf_skb_proto_xlat(skb, proto); | |
6aaae2b6 | 2910 | bpf_compute_data_pointers(skb); |
6578171a DB |
2911 | return ret; |
2912 | } | |
2913 | ||
2914 | static const struct bpf_func_proto bpf_skb_change_proto_proto = { | |
2915 | .func = bpf_skb_change_proto, | |
2916 | .gpl_only = false, | |
2917 | .ret_type = RET_INTEGER, | |
2918 | .arg1_type = ARG_PTR_TO_CTX, | |
2919 | .arg2_type = ARG_ANYTHING, | |
2920 | .arg3_type = ARG_ANYTHING, | |
2921 | }; | |
2922 | ||
f3694e00 | 2923 | BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) |
d2485c42 | 2924 | { |
d2485c42 | 2925 | /* We only allow a restricted subset to be changed for now. */ |
45c7fffa DB |
2926 | if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || |
2927 | !skb_pkt_type_ok(pkt_type))) | |
d2485c42 DB |
2928 | return -EINVAL; |
2929 | ||
2930 | skb->pkt_type = pkt_type; | |
2931 | return 0; | |
2932 | } | |
2933 | ||
2934 | static const struct bpf_func_proto bpf_skb_change_type_proto = { | |
2935 | .func = bpf_skb_change_type, | |
2936 | .gpl_only = false, | |
2937 | .ret_type = RET_INTEGER, | |
2938 | .arg1_type = ARG_PTR_TO_CTX, | |
2939 | .arg2_type = ARG_ANYTHING, | |
2940 | }; | |
2941 | ||
2be7e212 DB |
2942 | static u32 bpf_skb_net_base_len(const struct sk_buff *skb) |
2943 | { | |
2944 | switch (skb->protocol) { | |
2945 | case htons(ETH_P_IP): | |
2946 | return sizeof(struct iphdr); | |
2947 | case htons(ETH_P_IPV6): | |
2948 | return sizeof(struct ipv6hdr); | |
2949 | default: | |
2950 | return ~0U; | |
2951 | } | |
2952 | } | |
2953 | ||
2954 | static int bpf_skb_net_grow(struct sk_buff *skb, u32 len_diff) | |
2955 | { | |
2956 | u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb); | |
2957 | int ret; | |
2958 | ||
d02f51cb DA |
2959 | /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */ |
2960 | if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb))) | |
2961 | return -ENOTSUPP; | |
2962 | ||
2be7e212 DB |
2963 | ret = skb_cow(skb, len_diff); |
2964 | if (unlikely(ret < 0)) | |
2965 | return ret; | |
2966 | ||
2967 | ret = bpf_skb_net_hdr_push(skb, off, len_diff); | |
2968 | if (unlikely(ret < 0)) | |
2969 | return ret; | |
2970 | ||
2971 | if (skb_is_gso(skb)) { | |
d02f51cb DA |
2972 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
2973 | ||
2be7e212 | 2974 | /* Due to header grow, MSS needs to be downgraded. */ |
d02f51cb | 2975 | skb_decrease_gso_size(shinfo, len_diff); |
2be7e212 | 2976 | /* Header must be checked, and gso_segs recomputed. */ |
d02f51cb DA |
2977 | shinfo->gso_type |= SKB_GSO_DODGY; |
2978 | shinfo->gso_segs = 0; | |
2be7e212 DB |
2979 | } |
2980 | ||
2981 | return 0; | |
2982 | } | |
2983 | ||
2984 | static int bpf_skb_net_shrink(struct sk_buff *skb, u32 len_diff) | |
2985 | { | |
2986 | u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb); | |
2987 | int ret; | |
2988 | ||
d02f51cb DA |
2989 | /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */ |
2990 | if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb))) | |
2991 | return -ENOTSUPP; | |
2992 | ||
2be7e212 DB |
2993 | ret = skb_unclone(skb, GFP_ATOMIC); |
2994 | if (unlikely(ret < 0)) | |
2995 | return ret; | |
2996 | ||
2997 | ret = bpf_skb_net_hdr_pop(skb, off, len_diff); | |
2998 | if (unlikely(ret < 0)) | |
2999 | return ret; | |
3000 | ||
3001 | if (skb_is_gso(skb)) { | |
d02f51cb DA |
3002 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
3003 | ||
2be7e212 | 3004 | /* Due to header shrink, MSS can be upgraded. */ |
d02f51cb | 3005 | skb_increase_gso_size(shinfo, len_diff); |
2be7e212 | 3006 | /* Header must be checked, and gso_segs recomputed. */ |
d02f51cb DA |
3007 | shinfo->gso_type |= SKB_GSO_DODGY; |
3008 | shinfo->gso_segs = 0; | |
2be7e212 DB |
3009 | } |
3010 | ||
3011 | return 0; | |
3012 | } | |
3013 | ||
3014 | static u32 __bpf_skb_max_len(const struct sk_buff *skb) | |
3015 | { | |
0c6bc6e5 JF |
3016 | return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len : |
3017 | SKB_MAX_ALLOC; | |
2be7e212 DB |
3018 | } |
3019 | ||
3020 | static int bpf_skb_adjust_net(struct sk_buff *skb, s32 len_diff) | |
3021 | { | |
3022 | bool trans_same = skb->transport_header == skb->network_header; | |
3023 | u32 len_cur, len_diff_abs = abs(len_diff); | |
3024 | u32 len_min = bpf_skb_net_base_len(skb); | |
3025 | u32 len_max = __bpf_skb_max_len(skb); | |
3026 | __be16 proto = skb->protocol; | |
3027 | bool shrink = len_diff < 0; | |
3028 | int ret; | |
3029 | ||
3030 | if (unlikely(len_diff_abs > 0xfffU)) | |
3031 | return -EFAULT; | |
3032 | if (unlikely(proto != htons(ETH_P_IP) && | |
3033 | proto != htons(ETH_P_IPV6))) | |
3034 | return -ENOTSUPP; | |
3035 | ||
3036 | len_cur = skb->len - skb_network_offset(skb); | |
3037 | if (skb_transport_header_was_set(skb) && !trans_same) | |
3038 | len_cur = skb_network_header_len(skb); | |
3039 | if ((shrink && (len_diff_abs >= len_cur || | |
3040 | len_cur - len_diff_abs < len_min)) || | |
3041 | (!shrink && (skb->len + len_diff_abs > len_max && | |
3042 | !skb_is_gso(skb)))) | |
3043 | return -ENOTSUPP; | |
3044 | ||
3045 | ret = shrink ? bpf_skb_net_shrink(skb, len_diff_abs) : | |
3046 | bpf_skb_net_grow(skb, len_diff_abs); | |
3047 | ||
6aaae2b6 | 3048 | bpf_compute_data_pointers(skb); |
e4a6a342 | 3049 | return ret; |
2be7e212 DB |
3050 | } |
3051 | ||
3052 | BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, | |
3053 | u32, mode, u64, flags) | |
3054 | { | |
3055 | if (unlikely(flags)) | |
3056 | return -EINVAL; | |
3057 | if (likely(mode == BPF_ADJ_ROOM_NET)) | |
3058 | return bpf_skb_adjust_net(skb, len_diff); | |
3059 | ||
3060 | return -ENOTSUPP; | |
3061 | } | |
3062 | ||
3063 | static const struct bpf_func_proto bpf_skb_adjust_room_proto = { | |
3064 | .func = bpf_skb_adjust_room, | |
3065 | .gpl_only = false, | |
3066 | .ret_type = RET_INTEGER, | |
3067 | .arg1_type = ARG_PTR_TO_CTX, | |
3068 | .arg2_type = ARG_ANYTHING, | |
3069 | .arg3_type = ARG_ANYTHING, | |
3070 | .arg4_type = ARG_ANYTHING, | |
3071 | }; | |
3072 | ||
5293efe6 DB |
3073 | static u32 __bpf_skb_min_len(const struct sk_buff *skb) |
3074 | { | |
3075 | u32 min_len = skb_network_offset(skb); | |
3076 | ||
3077 | if (skb_transport_header_was_set(skb)) | |
3078 | min_len = skb_transport_offset(skb); | |
3079 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
3080 | min_len = skb_checksum_start_offset(skb) + | |
3081 | skb->csum_offset + sizeof(__sum16); | |
3082 | return min_len; | |
3083 | } | |
3084 | ||
5293efe6 DB |
3085 | static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) |
3086 | { | |
3087 | unsigned int old_len = skb->len; | |
3088 | int ret; | |
3089 | ||
3090 | ret = __skb_grow_rcsum(skb, new_len); | |
3091 | if (!ret) | |
3092 | memset(skb->data + old_len, 0, new_len - old_len); | |
3093 | return ret; | |
3094 | } | |
3095 | ||
3096 | static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) | |
3097 | { | |
3098 | return __skb_trim_rcsum(skb, new_len); | |
3099 | } | |
3100 | ||
0ea488ff JF |
3101 | static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len, |
3102 | u64 flags) | |
5293efe6 | 3103 | { |
5293efe6 DB |
3104 | u32 max_len = __bpf_skb_max_len(skb); |
3105 | u32 min_len = __bpf_skb_min_len(skb); | |
5293efe6 DB |
3106 | int ret; |
3107 | ||
3108 | if (unlikely(flags || new_len > max_len || new_len < min_len)) | |
3109 | return -EINVAL; | |
3110 | if (skb->encapsulation) | |
3111 | return -ENOTSUPP; | |
3112 | ||
3113 | /* The basic idea of this helper is that it's performing the | |
3114 | * needed work to either grow or trim an skb, and eBPF program | |
3115 | * rewrites the rest via helpers like bpf_skb_store_bytes(), | |
3116 | * bpf_lX_csum_replace() and others rather than passing a raw | |
3117 | * buffer here. This one is a slow path helper and intended | |
3118 | * for replies with control messages. | |
3119 | * | |
3120 | * Like in bpf_skb_change_proto(), we want to keep this rather | |
3121 | * minimal and without protocol specifics so that we are able | |
3122 | * to separate concerns as in bpf_skb_store_bytes() should only | |
3123 | * be the one responsible for writing buffers. | |
3124 | * | |
3125 | * It's really expected to be a slow path operation here for | |
3126 | * control message replies, so we're implicitly linearizing, | |
3127 | * uncloning and drop offloads from the skb by this. | |
3128 | */ | |
3129 | ret = __bpf_try_make_writable(skb, skb->len); | |
3130 | if (!ret) { | |
3131 | if (new_len > skb->len) | |
3132 | ret = bpf_skb_grow_rcsum(skb, new_len); | |
3133 | else if (new_len < skb->len) | |
3134 | ret = bpf_skb_trim_rcsum(skb, new_len); | |
3135 | if (!ret && skb_is_gso(skb)) | |
3136 | skb_gso_reset(skb); | |
3137 | } | |
0ea488ff JF |
3138 | return ret; |
3139 | } | |
3140 | ||
3141 | BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, | |
3142 | u64, flags) | |
3143 | { | |
3144 | int ret = __bpf_skb_change_tail(skb, new_len, flags); | |
5293efe6 | 3145 | |
6aaae2b6 | 3146 | bpf_compute_data_pointers(skb); |
5293efe6 DB |
3147 | return ret; |
3148 | } | |
3149 | ||
3150 | static const struct bpf_func_proto bpf_skb_change_tail_proto = { | |
3151 | .func = bpf_skb_change_tail, | |
3152 | .gpl_only = false, | |
3153 | .ret_type = RET_INTEGER, | |
3154 | .arg1_type = ARG_PTR_TO_CTX, | |
3155 | .arg2_type = ARG_ANYTHING, | |
3156 | .arg3_type = ARG_ANYTHING, | |
3157 | }; | |
3158 | ||
0ea488ff | 3159 | BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len, |
3a0af8fd | 3160 | u64, flags) |
0ea488ff JF |
3161 | { |
3162 | int ret = __bpf_skb_change_tail(skb, new_len, flags); | |
3163 | ||
3164 | bpf_compute_data_end_sk_skb(skb); | |
3165 | return ret; | |
3166 | } | |
3167 | ||
3168 | static const struct bpf_func_proto sk_skb_change_tail_proto = { | |
3169 | .func = sk_skb_change_tail, | |
3170 | .gpl_only = false, | |
3171 | .ret_type = RET_INTEGER, | |
3172 | .arg1_type = ARG_PTR_TO_CTX, | |
3173 | .arg2_type = ARG_ANYTHING, | |
3174 | .arg3_type = ARG_ANYTHING, | |
3175 | }; | |
3176 | ||
3177 | static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room, | |
3178 | u64 flags) | |
3a0af8fd TG |
3179 | { |
3180 | u32 max_len = __bpf_skb_max_len(skb); | |
3181 | u32 new_len = skb->len + head_room; | |
3182 | int ret; | |
3183 | ||
3184 | if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || | |
3185 | new_len < skb->len)) | |
3186 | return -EINVAL; | |
3187 | ||
3188 | ret = skb_cow(skb, head_room); | |
3189 | if (likely(!ret)) { | |
3190 | /* Idea for this helper is that we currently only | |
3191 | * allow to expand on mac header. This means that | |
3192 | * skb->protocol network header, etc, stay as is. | |
3193 | * Compared to bpf_skb_change_tail(), we're more | |
3194 | * flexible due to not needing to linearize or | |
3195 | * reset GSO. Intention for this helper is to be | |
3196 | * used by an L3 skb that needs to push mac header | |
3197 | * for redirection into L2 device. | |
3198 | */ | |
3199 | __skb_push(skb, head_room); | |
3200 | memset(skb->data, 0, head_room); | |
3201 | skb_reset_mac_header(skb); | |
3202 | } | |
3203 | ||
0ea488ff JF |
3204 | return ret; |
3205 | } | |
3206 | ||
3207 | BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, | |
3208 | u64, flags) | |
3209 | { | |
3210 | int ret = __bpf_skb_change_head(skb, head_room, flags); | |
3211 | ||
6aaae2b6 | 3212 | bpf_compute_data_pointers(skb); |
0ea488ff | 3213 | return ret; |
3a0af8fd TG |
3214 | } |
3215 | ||
3216 | static const struct bpf_func_proto bpf_skb_change_head_proto = { | |
3217 | .func = bpf_skb_change_head, | |
3218 | .gpl_only = false, | |
3219 | .ret_type = RET_INTEGER, | |
3220 | .arg1_type = ARG_PTR_TO_CTX, | |
3221 | .arg2_type = ARG_ANYTHING, | |
3222 | .arg3_type = ARG_ANYTHING, | |
3223 | }; | |
3224 | ||
0ea488ff JF |
3225 | BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room, |
3226 | u64, flags) | |
3227 | { | |
3228 | int ret = __bpf_skb_change_head(skb, head_room, flags); | |
3229 | ||
3230 | bpf_compute_data_end_sk_skb(skb); | |
3231 | return ret; | |
3232 | } | |
3233 | ||
3234 | static const struct bpf_func_proto sk_skb_change_head_proto = { | |
3235 | .func = sk_skb_change_head, | |
3236 | .gpl_only = false, | |
3237 | .ret_type = RET_INTEGER, | |
3238 | .arg1_type = ARG_PTR_TO_CTX, | |
3239 | .arg2_type = ARG_ANYTHING, | |
3240 | .arg3_type = ARG_ANYTHING, | |
3241 | }; | |
de8f3a83 DB |
3242 | static unsigned long xdp_get_metalen(const struct xdp_buff *xdp) |
3243 | { | |
3244 | return xdp_data_meta_unsupported(xdp) ? 0 : | |
3245 | xdp->data - xdp->data_meta; | |
3246 | } | |
3247 | ||
17bedab2 MKL |
3248 | BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) |
3249 | { | |
6dfb970d | 3250 | void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); |
de8f3a83 | 3251 | unsigned long metalen = xdp_get_metalen(xdp); |
97e19cce | 3252 | void *data_start = xdp_frame_end + metalen; |
17bedab2 MKL |
3253 | void *data = xdp->data + offset; |
3254 | ||
de8f3a83 | 3255 | if (unlikely(data < data_start || |
17bedab2 MKL |
3256 | data > xdp->data_end - ETH_HLEN)) |
3257 | return -EINVAL; | |
3258 | ||
de8f3a83 DB |
3259 | if (metalen) |
3260 | memmove(xdp->data_meta + offset, | |
3261 | xdp->data_meta, metalen); | |
3262 | xdp->data_meta += offset; | |
17bedab2 MKL |
3263 | xdp->data = data; |
3264 | ||
3265 | return 0; | |
3266 | } | |
3267 | ||
3268 | static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { | |
3269 | .func = bpf_xdp_adjust_head, | |
3270 | .gpl_only = false, | |
3271 | .ret_type = RET_INTEGER, | |
3272 | .arg1_type = ARG_PTR_TO_CTX, | |
3273 | .arg2_type = ARG_ANYTHING, | |
3274 | }; | |
3275 | ||
b32cc5b9 NS |
3276 | BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset) |
3277 | { | |
3278 | void *data_end = xdp->data_end + offset; | |
3279 | ||
3280 | /* only shrinking is allowed for now. */ | |
3281 | if (unlikely(offset >= 0)) | |
3282 | return -EINVAL; | |
3283 | ||
3284 | if (unlikely(data_end < xdp->data + ETH_HLEN)) | |
3285 | return -EINVAL; | |
3286 | ||
3287 | xdp->data_end = data_end; | |
3288 | ||
3289 | return 0; | |
3290 | } | |
3291 | ||
3292 | static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = { | |
3293 | .func = bpf_xdp_adjust_tail, | |
3294 | .gpl_only = false, | |
3295 | .ret_type = RET_INTEGER, | |
3296 | .arg1_type = ARG_PTR_TO_CTX, | |
3297 | .arg2_type = ARG_ANYTHING, | |
3298 | }; | |
3299 | ||
de8f3a83 DB |
3300 | BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset) |
3301 | { | |
97e19cce | 3302 | void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); |
de8f3a83 DB |
3303 | void *meta = xdp->data_meta + offset; |
3304 | unsigned long metalen = xdp->data - meta; | |
3305 | ||
3306 | if (xdp_data_meta_unsupported(xdp)) | |
3307 | return -ENOTSUPP; | |
97e19cce | 3308 | if (unlikely(meta < xdp_frame_end || |
de8f3a83 DB |
3309 | meta > xdp->data)) |
3310 | return -EINVAL; | |
3311 | if (unlikely((metalen & (sizeof(__u32) - 1)) || | |
3312 | (metalen > 32))) | |
3313 | return -EACCES; | |
3314 | ||
3315 | xdp->data_meta = meta; | |
3316 | ||
3317 | return 0; | |
3318 | } | |
3319 | ||
3320 | static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { | |
3321 | .func = bpf_xdp_adjust_meta, | |
3322 | .gpl_only = false, | |
3323 | .ret_type = RET_INTEGER, | |
3324 | .arg1_type = ARG_PTR_TO_CTX, | |
3325 | .arg2_type = ARG_ANYTHING, | |
3326 | }; | |
3327 | ||
11393cc9 JF |
3328 | static int __bpf_tx_xdp(struct net_device *dev, |
3329 | struct bpf_map *map, | |
3330 | struct xdp_buff *xdp, | |
3331 | u32 index) | |
814abfab | 3332 | { |
44fa2dbd | 3333 | struct xdp_frame *xdpf; |
d8d7218a | 3334 | int err, sent; |
11393cc9 JF |
3335 | |
3336 | if (!dev->netdev_ops->ndo_xdp_xmit) { | |
11393cc9 | 3337 | return -EOPNOTSUPP; |
814abfab | 3338 | } |
11393cc9 | 3339 | |
d8d7218a TM |
3340 | err = xdp_ok_fwd_dev(dev, xdp->data_end - xdp->data); |
3341 | if (unlikely(err)) | |
3342 | return err; | |
3343 | ||
44fa2dbd JDB |
3344 | xdpf = convert_to_xdp_frame(xdp); |
3345 | if (unlikely(!xdpf)) | |
3346 | return -EOVERFLOW; | |
3347 | ||
1e67575a | 3348 | sent = dev->netdev_ops->ndo_xdp_xmit(dev, 1, &xdpf, XDP_XMIT_FLUSH); |
735fc405 JDB |
3349 | if (sent <= 0) |
3350 | return sent; | |
9c270af3 JDB |
3351 | return 0; |
3352 | } | |
3353 | ||
47b123ed JDB |
3354 | static noinline int |
3355 | xdp_do_redirect_slow(struct net_device *dev, struct xdp_buff *xdp, | |
3356 | struct bpf_prog *xdp_prog, struct bpf_redirect_info *ri) | |
3357 | { | |
3358 | struct net_device *fwd; | |
3359 | u32 index = ri->ifindex; | |
3360 | int err; | |
3361 | ||
3362 | fwd = dev_get_by_index_rcu(dev_net(dev), index); | |
3363 | ri->ifindex = 0; | |
3364 | if (unlikely(!fwd)) { | |
3365 | err = -EINVAL; | |
3366 | goto err; | |
3367 | } | |
3368 | ||
3369 | err = __bpf_tx_xdp(fwd, NULL, xdp, 0); | |
3370 | if (unlikely(err)) | |
3371 | goto err; | |
3372 | ||
3373 | _trace_xdp_redirect(dev, xdp_prog, index); | |
3374 | return 0; | |
3375 | err: | |
3376 | _trace_xdp_redirect_err(dev, xdp_prog, index, err); | |
3377 | return err; | |
3378 | } | |
3379 | ||
9c270af3 JDB |
3380 | static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd, |
3381 | struct bpf_map *map, | |
3382 | struct xdp_buff *xdp, | |
3383 | u32 index) | |
3384 | { | |
3385 | int err; | |
3386 | ||
1b1a251c BT |
3387 | switch (map->map_type) { |
3388 | case BPF_MAP_TYPE_DEVMAP: { | |
67f29e07 | 3389 | struct bpf_dtab_netdev *dst = fwd; |
9c270af3 | 3390 | |
38edddb8 | 3391 | err = dev_map_enqueue(dst, xdp, dev_rx); |
e1302542 | 3392 | if (unlikely(err)) |
9c270af3 | 3393 | return err; |
11393cc9 | 3394 | __dev_map_insert_ctx(map, index); |
1b1a251c BT |
3395 | break; |
3396 | } | |
3397 | case BPF_MAP_TYPE_CPUMAP: { | |
9c270af3 JDB |
3398 | struct bpf_cpu_map_entry *rcpu = fwd; |
3399 | ||
3400 | err = cpu_map_enqueue(rcpu, xdp, dev_rx); | |
e1302542 | 3401 | if (unlikely(err)) |
9c270af3 JDB |
3402 | return err; |
3403 | __cpu_map_insert_ctx(map, index); | |
1b1a251c BT |
3404 | break; |
3405 | } | |
3406 | case BPF_MAP_TYPE_XSKMAP: { | |
3407 | struct xdp_sock *xs = fwd; | |
3408 | ||
3409 | err = __xsk_map_redirect(map, xdp, xs); | |
3410 | return err; | |
3411 | } | |
3412 | default: | |
3413 | break; | |
9c270af3 | 3414 | } |
e4a8e817 | 3415 | return 0; |
814abfab JF |
3416 | } |
3417 | ||
11393cc9 JF |
3418 | void xdp_do_flush_map(void) |
3419 | { | |
0b19cc0a | 3420 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
11393cc9 JF |
3421 | struct bpf_map *map = ri->map_to_flush; |
3422 | ||
11393cc9 | 3423 | ri->map_to_flush = NULL; |
9c270af3 JDB |
3424 | if (map) { |
3425 | switch (map->map_type) { | |
3426 | case BPF_MAP_TYPE_DEVMAP: | |
3427 | __dev_map_flush(map); | |
3428 | break; | |
3429 | case BPF_MAP_TYPE_CPUMAP: | |
3430 | __cpu_map_flush(map); | |
3431 | break; | |
1b1a251c BT |
3432 | case BPF_MAP_TYPE_XSKMAP: |
3433 | __xsk_map_flush(map); | |
3434 | break; | |
9c270af3 JDB |
3435 | default: |
3436 | break; | |
3437 | } | |
3438 | } | |
11393cc9 JF |
3439 | } |
3440 | EXPORT_SYMBOL_GPL(xdp_do_flush_map); | |
3441 | ||
2a68d85f | 3442 | static inline void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index) |
9c270af3 JDB |
3443 | { |
3444 | switch (map->map_type) { | |
3445 | case BPF_MAP_TYPE_DEVMAP: | |
3446 | return __dev_map_lookup_elem(map, index); | |
3447 | case BPF_MAP_TYPE_CPUMAP: | |
3448 | return __cpu_map_lookup_elem(map, index); | |
1b1a251c BT |
3449 | case BPF_MAP_TYPE_XSKMAP: |
3450 | return __xsk_map_lookup_elem(map, index); | |
9c270af3 JDB |
3451 | default: |
3452 | return NULL; | |
3453 | } | |
3454 | } | |
3455 | ||
f6069b9a | 3456 | void bpf_clear_redirect_map(struct bpf_map *map) |
7c300131 | 3457 | { |
f6069b9a DB |
3458 | struct bpf_redirect_info *ri; |
3459 | int cpu; | |
3460 | ||
3461 | for_each_possible_cpu(cpu) { | |
3462 | ri = per_cpu_ptr(&bpf_redirect_info, cpu); | |
3463 | /* Avoid polluting remote cacheline due to writes if | |
3464 | * not needed. Once we pass this test, we need the | |
3465 | * cmpxchg() to make sure it hasn't been changed in | |
3466 | * the meantime by remote CPU. | |
3467 | */ | |
3468 | if (unlikely(READ_ONCE(ri->map) == map)) | |
3469 | cmpxchg(&ri->map, map, NULL); | |
3470 | } | |
7c300131 DB |
3471 | } |
3472 | ||
e4a8e817 | 3473 | static int xdp_do_redirect_map(struct net_device *dev, struct xdp_buff *xdp, |
47b123ed JDB |
3474 | struct bpf_prog *xdp_prog, struct bpf_map *map, |
3475 | struct bpf_redirect_info *ri) | |
97f91a7c | 3476 | { |
11393cc9 | 3477 | u32 index = ri->ifindex; |
9c270af3 | 3478 | void *fwd = NULL; |
4c03bdd7 | 3479 | int err; |
97f91a7c JF |
3480 | |
3481 | ri->ifindex = 0; | |
f6069b9a | 3482 | WRITE_ONCE(ri->map, NULL); |
97f91a7c | 3483 | |
9c270af3 | 3484 | fwd = __xdp_map_lookup_elem(map, index); |
2a68d85f | 3485 | if (unlikely(!fwd)) { |
4c03bdd7 | 3486 | err = -EINVAL; |
f5836ca5 | 3487 | goto err; |
4c03bdd7 | 3488 | } |
e1302542 | 3489 | if (ri->map_to_flush && unlikely(ri->map_to_flush != map)) |
11393cc9 JF |
3490 | xdp_do_flush_map(); |
3491 | ||
9c270af3 | 3492 | err = __bpf_tx_xdp_map(dev, fwd, map, xdp, index); |
f5836ca5 JDB |
3493 | if (unlikely(err)) |
3494 | goto err; | |
3495 | ||
3496 | ri->map_to_flush = map; | |
59a30896 | 3497 | _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); |
f5836ca5 JDB |
3498 | return 0; |
3499 | err: | |
59a30896 | 3500 | _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); |
97f91a7c JF |
3501 | return err; |
3502 | } | |
3503 | ||
5acaee0a JF |
3504 | int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, |
3505 | struct bpf_prog *xdp_prog) | |
814abfab | 3506 | { |
0b19cc0a | 3507 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
f6069b9a | 3508 | struct bpf_map *map = READ_ONCE(ri->map); |
814abfab | 3509 | |
2a68d85f | 3510 | if (likely(map)) |
47b123ed | 3511 | return xdp_do_redirect_map(dev, xdp, xdp_prog, map, ri); |
97f91a7c | 3512 | |
47b123ed | 3513 | return xdp_do_redirect_slow(dev, xdp, xdp_prog, ri); |
814abfab JF |
3514 | } |
3515 | EXPORT_SYMBOL_GPL(xdp_do_redirect); | |
3516 | ||
c060bc61 XS |
3517 | static int xdp_do_generic_redirect_map(struct net_device *dev, |
3518 | struct sk_buff *skb, | |
02671e23 | 3519 | struct xdp_buff *xdp, |
f6069b9a DB |
3520 | struct bpf_prog *xdp_prog, |
3521 | struct bpf_map *map) | |
6103aa96 | 3522 | { |
0b19cc0a | 3523 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
eb48d682 | 3524 | u32 index = ri->ifindex; |
02671e23 | 3525 | void *fwd = NULL; |
2facaad6 | 3526 | int err = 0; |
6103aa96 | 3527 | |
6103aa96 | 3528 | ri->ifindex = 0; |
f6069b9a | 3529 | WRITE_ONCE(ri->map, NULL); |
96c5508e | 3530 | |
9c270af3 | 3531 | fwd = __xdp_map_lookup_elem(map, index); |
2facaad6 JDB |
3532 | if (unlikely(!fwd)) { |
3533 | err = -EINVAL; | |
f5836ca5 | 3534 | goto err; |
6103aa96 JF |
3535 | } |
3536 | ||
9c270af3 | 3537 | if (map->map_type == BPF_MAP_TYPE_DEVMAP) { |
6d5fc195 TM |
3538 | struct bpf_dtab_netdev *dst = fwd; |
3539 | ||
3540 | err = dev_map_generic_redirect(dst, skb, xdp_prog); | |
3541 | if (unlikely(err)) | |
9c270af3 | 3542 | goto err; |
02671e23 BT |
3543 | } else if (map->map_type == BPF_MAP_TYPE_XSKMAP) { |
3544 | struct xdp_sock *xs = fwd; | |
3545 | ||
3546 | err = xsk_generic_rcv(xs, xdp); | |
3547 | if (err) | |
3548 | goto err; | |
3549 | consume_skb(skb); | |
9c270af3 JDB |
3550 | } else { |
3551 | /* TODO: Handle BPF_MAP_TYPE_CPUMAP */ | |
3552 | err = -EBADRQC; | |
f5836ca5 | 3553 | goto err; |
2facaad6 | 3554 | } |
6103aa96 | 3555 | |
9c270af3 JDB |
3556 | _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); |
3557 | return 0; | |
3558 | err: | |
3559 | _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); | |
3560 | return err; | |
3561 | } | |
3562 | ||
3563 | int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb, | |
02671e23 | 3564 | struct xdp_buff *xdp, struct bpf_prog *xdp_prog) |
9c270af3 | 3565 | { |
0b19cc0a | 3566 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
f6069b9a | 3567 | struct bpf_map *map = READ_ONCE(ri->map); |
9c270af3 JDB |
3568 | u32 index = ri->ifindex; |
3569 | struct net_device *fwd; | |
3570 | int err = 0; | |
3571 | ||
f6069b9a DB |
3572 | if (map) |
3573 | return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog, | |
3574 | map); | |
9c270af3 JDB |
3575 | ri->ifindex = 0; |
3576 | fwd = dev_get_by_index_rcu(dev_net(dev), index); | |
3577 | if (unlikely(!fwd)) { | |
3578 | err = -EINVAL; | |
f5836ca5 | 3579 | goto err; |
2facaad6 JDB |
3580 | } |
3581 | ||
d8d7218a TM |
3582 | err = xdp_ok_fwd_dev(fwd, skb->len); |
3583 | if (unlikely(err)) | |
9c270af3 JDB |
3584 | goto err; |
3585 | ||
2facaad6 | 3586 | skb->dev = fwd; |
9c270af3 | 3587 | _trace_xdp_redirect(dev, xdp_prog, index); |
02671e23 | 3588 | generic_xdp_tx(skb, xdp_prog); |
f5836ca5 JDB |
3589 | return 0; |
3590 | err: | |
9c270af3 | 3591 | _trace_xdp_redirect_err(dev, xdp_prog, index, err); |
2facaad6 | 3592 | return err; |
6103aa96 JF |
3593 | } |
3594 | EXPORT_SYMBOL_GPL(xdp_do_generic_redirect); | |
3595 | ||
814abfab JF |
3596 | BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) |
3597 | { | |
0b19cc0a | 3598 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
814abfab JF |
3599 | |
3600 | if (unlikely(flags)) | |
3601 | return XDP_ABORTED; | |
3602 | ||
3603 | ri->ifindex = ifindex; | |
3604 | ri->flags = flags; | |
f6069b9a | 3605 | WRITE_ONCE(ri->map, NULL); |
e4a8e817 | 3606 | |
814abfab JF |
3607 | return XDP_REDIRECT; |
3608 | } | |
3609 | ||
3610 | static const struct bpf_func_proto bpf_xdp_redirect_proto = { | |
3611 | .func = bpf_xdp_redirect, | |
3612 | .gpl_only = false, | |
3613 | .ret_type = RET_INTEGER, | |
3614 | .arg1_type = ARG_ANYTHING, | |
3615 | .arg2_type = ARG_ANYTHING, | |
3616 | }; | |
3617 | ||
f6069b9a DB |
3618 | BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex, |
3619 | u64, flags) | |
e4a8e817 | 3620 | { |
0b19cc0a | 3621 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
e4a8e817 DB |
3622 | |
3623 | if (unlikely(flags)) | |
3624 | return XDP_ABORTED; | |
3625 | ||
3626 | ri->ifindex = ifindex; | |
3627 | ri->flags = flags; | |
f6069b9a | 3628 | WRITE_ONCE(ri->map, map); |
e4a8e817 DB |
3629 | |
3630 | return XDP_REDIRECT; | |
3631 | } | |
3632 | ||
3633 | static const struct bpf_func_proto bpf_xdp_redirect_map_proto = { | |
3634 | .func = bpf_xdp_redirect_map, | |
3635 | .gpl_only = false, | |
3636 | .ret_type = RET_INTEGER, | |
3637 | .arg1_type = ARG_CONST_MAP_PTR, | |
3638 | .arg2_type = ARG_ANYTHING, | |
3639 | .arg3_type = ARG_ANYTHING, | |
3640 | }; | |
3641 | ||
555c8a86 | 3642 | static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, |
aa7145c1 | 3643 | unsigned long off, unsigned long len) |
555c8a86 | 3644 | { |
aa7145c1 | 3645 | void *ptr = skb_header_pointer(skb, off, len, dst_buff); |
555c8a86 DB |
3646 | |
3647 | if (unlikely(!ptr)) | |
3648 | return len; | |
3649 | if (ptr != dst_buff) | |
3650 | memcpy(dst_buff, ptr, len); | |
3651 | ||
3652 | return 0; | |
3653 | } | |
3654 | ||
f3694e00 DB |
3655 | BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, |
3656 | u64, flags, void *, meta, u64, meta_size) | |
555c8a86 | 3657 | { |
555c8a86 | 3658 | u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; |
555c8a86 DB |
3659 | |
3660 | if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) | |
3661 | return -EINVAL; | |
3662 | if (unlikely(skb_size > skb->len)) | |
3663 | return -EFAULT; | |
3664 | ||
3665 | return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, | |
3666 | bpf_skb_copy); | |
3667 | } | |
3668 | ||
3669 | static const struct bpf_func_proto bpf_skb_event_output_proto = { | |
3670 | .func = bpf_skb_event_output, | |
3671 | .gpl_only = true, | |
3672 | .ret_type = RET_INTEGER, | |
3673 | .arg1_type = ARG_PTR_TO_CTX, | |
3674 | .arg2_type = ARG_CONST_MAP_PTR, | |
3675 | .arg3_type = ARG_ANYTHING, | |
39f19ebb | 3676 | .arg4_type = ARG_PTR_TO_MEM, |
1728a4f2 | 3677 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
555c8a86 DB |
3678 | }; |
3679 | ||
c6c33454 DB |
3680 | static unsigned short bpf_tunnel_key_af(u64 flags) |
3681 | { | |
3682 | return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; | |
3683 | } | |
3684 | ||
f3694e00 DB |
3685 | BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, |
3686 | u32, size, u64, flags) | |
d3aa45ce | 3687 | { |
c6c33454 DB |
3688 | const struct ip_tunnel_info *info = skb_tunnel_info(skb); |
3689 | u8 compat[sizeof(struct bpf_tunnel_key)]; | |
074f528e DB |
3690 | void *to_orig = to; |
3691 | int err; | |
d3aa45ce | 3692 | |
074f528e DB |
3693 | if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) { |
3694 | err = -EINVAL; | |
3695 | goto err_clear; | |
3696 | } | |
3697 | if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { | |
3698 | err = -EPROTO; | |
3699 | goto err_clear; | |
3700 | } | |
c6c33454 | 3701 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) { |
074f528e | 3702 | err = -EINVAL; |
c6c33454 | 3703 | switch (size) { |
4018ab18 | 3704 | case offsetof(struct bpf_tunnel_key, tunnel_label): |
c0e760c9 | 3705 | case offsetof(struct bpf_tunnel_key, tunnel_ext): |
4018ab18 | 3706 | goto set_compat; |
c6c33454 DB |
3707 | case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): |
3708 | /* Fixup deprecated structure layouts here, so we have | |
3709 | * a common path later on. | |
3710 | */ | |
3711 | if (ip_tunnel_info_af(info) != AF_INET) | |
074f528e | 3712 | goto err_clear; |
4018ab18 | 3713 | set_compat: |
c6c33454 DB |
3714 | to = (struct bpf_tunnel_key *)compat; |
3715 | break; | |
3716 | default: | |
074f528e | 3717 | goto err_clear; |
c6c33454 DB |
3718 | } |
3719 | } | |
d3aa45ce AS |
3720 | |
3721 | to->tunnel_id = be64_to_cpu(info->key.tun_id); | |
c6c33454 DB |
3722 | to->tunnel_tos = info->key.tos; |
3723 | to->tunnel_ttl = info->key.ttl; | |
1fbc2e0c | 3724 | to->tunnel_ext = 0; |
c6c33454 | 3725 | |
4018ab18 | 3726 | if (flags & BPF_F_TUNINFO_IPV6) { |
c6c33454 DB |
3727 | memcpy(to->remote_ipv6, &info->key.u.ipv6.src, |
3728 | sizeof(to->remote_ipv6)); | |
4018ab18 DB |
3729 | to->tunnel_label = be32_to_cpu(info->key.label); |
3730 | } else { | |
c6c33454 | 3731 | to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); |
1fbc2e0c DB |
3732 | memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); |
3733 | to->tunnel_label = 0; | |
4018ab18 | 3734 | } |
c6c33454 DB |
3735 | |
3736 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) | |
074f528e | 3737 | memcpy(to_orig, to, size); |
d3aa45ce AS |
3738 | |
3739 | return 0; | |
074f528e DB |
3740 | err_clear: |
3741 | memset(to_orig, 0, size); | |
3742 | return err; | |
d3aa45ce AS |
3743 | } |
3744 | ||
577c50aa | 3745 | static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { |
d3aa45ce AS |
3746 | .func = bpf_skb_get_tunnel_key, |
3747 | .gpl_only = false, | |
3748 | .ret_type = RET_INTEGER, | |
3749 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
3750 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, |
3751 | .arg3_type = ARG_CONST_SIZE, | |
d3aa45ce AS |
3752 | .arg4_type = ARG_ANYTHING, |
3753 | }; | |
3754 | ||
f3694e00 | 3755 | BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) |
14ca0751 | 3756 | { |
14ca0751 | 3757 | const struct ip_tunnel_info *info = skb_tunnel_info(skb); |
074f528e | 3758 | int err; |
14ca0751 DB |
3759 | |
3760 | if (unlikely(!info || | |
074f528e DB |
3761 | !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { |
3762 | err = -ENOENT; | |
3763 | goto err_clear; | |
3764 | } | |
3765 | if (unlikely(size < info->options_len)) { | |
3766 | err = -ENOMEM; | |
3767 | goto err_clear; | |
3768 | } | |
14ca0751 DB |
3769 | |
3770 | ip_tunnel_info_opts_get(to, info); | |
074f528e DB |
3771 | if (size > info->options_len) |
3772 | memset(to + info->options_len, 0, size - info->options_len); | |
14ca0751 DB |
3773 | |
3774 | return info->options_len; | |
074f528e DB |
3775 | err_clear: |
3776 | memset(to, 0, size); | |
3777 | return err; | |
14ca0751 DB |
3778 | } |
3779 | ||
3780 | static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { | |
3781 | .func = bpf_skb_get_tunnel_opt, | |
3782 | .gpl_only = false, | |
3783 | .ret_type = RET_INTEGER, | |
3784 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
3785 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, |
3786 | .arg3_type = ARG_CONST_SIZE, | |
14ca0751 DB |
3787 | }; |
3788 | ||
d3aa45ce AS |
3789 | static struct metadata_dst __percpu *md_dst; |
3790 | ||
f3694e00 DB |
3791 | BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, |
3792 | const struct bpf_tunnel_key *, from, u32, size, u64, flags) | |
d3aa45ce | 3793 | { |
d3aa45ce | 3794 | struct metadata_dst *md = this_cpu_ptr(md_dst); |
c6c33454 | 3795 | u8 compat[sizeof(struct bpf_tunnel_key)]; |
d3aa45ce AS |
3796 | struct ip_tunnel_info *info; |
3797 | ||
22080870 | 3798 | if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | |
77a5196a | 3799 | BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER))) |
d3aa45ce | 3800 | return -EINVAL; |
c6c33454 DB |
3801 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) { |
3802 | switch (size) { | |
4018ab18 | 3803 | case offsetof(struct bpf_tunnel_key, tunnel_label): |
c0e760c9 | 3804 | case offsetof(struct bpf_tunnel_key, tunnel_ext): |
c6c33454 DB |
3805 | case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): |
3806 | /* Fixup deprecated structure layouts here, so we have | |
3807 | * a common path later on. | |
3808 | */ | |
3809 | memcpy(compat, from, size); | |
3810 | memset(compat + size, 0, sizeof(compat) - size); | |
f3694e00 | 3811 | from = (const struct bpf_tunnel_key *) compat; |
c6c33454 DB |
3812 | break; |
3813 | default: | |
3814 | return -EINVAL; | |
3815 | } | |
3816 | } | |
c0e760c9 DB |
3817 | if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || |
3818 | from->tunnel_ext)) | |
4018ab18 | 3819 | return -EINVAL; |
d3aa45ce AS |
3820 | |
3821 | skb_dst_drop(skb); | |
3822 | dst_hold((struct dst_entry *) md); | |
3823 | skb_dst_set(skb, (struct dst_entry *) md); | |
3824 | ||
3825 | info = &md->u.tun_info; | |
5540fbf4 | 3826 | memset(info, 0, sizeof(*info)); |
d3aa45ce | 3827 | info->mode = IP_TUNNEL_INFO_TX; |
c6c33454 | 3828 | |
db3c6139 | 3829 | info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; |
22080870 DB |
3830 | if (flags & BPF_F_DONT_FRAGMENT) |
3831 | info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; | |
792f3dd6 WT |
3832 | if (flags & BPF_F_ZERO_CSUM_TX) |
3833 | info->key.tun_flags &= ~TUNNEL_CSUM; | |
77a5196a WT |
3834 | if (flags & BPF_F_SEQ_NUMBER) |
3835 | info->key.tun_flags |= TUNNEL_SEQ; | |
22080870 | 3836 | |
d3aa45ce | 3837 | info->key.tun_id = cpu_to_be64(from->tunnel_id); |
c6c33454 DB |
3838 | info->key.tos = from->tunnel_tos; |
3839 | info->key.ttl = from->tunnel_ttl; | |
3840 | ||
3841 | if (flags & BPF_F_TUNINFO_IPV6) { | |
3842 | info->mode |= IP_TUNNEL_INFO_IPV6; | |
3843 | memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, | |
3844 | sizeof(from->remote_ipv6)); | |
4018ab18 DB |
3845 | info->key.label = cpu_to_be32(from->tunnel_label) & |
3846 | IPV6_FLOWLABEL_MASK; | |
c6c33454 DB |
3847 | } else { |
3848 | info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); | |
3849 | } | |
d3aa45ce AS |
3850 | |
3851 | return 0; | |
3852 | } | |
3853 | ||
577c50aa | 3854 | static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { |
d3aa45ce AS |
3855 | .func = bpf_skb_set_tunnel_key, |
3856 | .gpl_only = false, | |
3857 | .ret_type = RET_INTEGER, | |
3858 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
3859 | .arg2_type = ARG_PTR_TO_MEM, |
3860 | .arg3_type = ARG_CONST_SIZE, | |
d3aa45ce AS |
3861 | .arg4_type = ARG_ANYTHING, |
3862 | }; | |
3863 | ||
f3694e00 DB |
3864 | BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, |
3865 | const u8 *, from, u32, size) | |
14ca0751 | 3866 | { |
14ca0751 DB |
3867 | struct ip_tunnel_info *info = skb_tunnel_info(skb); |
3868 | const struct metadata_dst *md = this_cpu_ptr(md_dst); | |
3869 | ||
3870 | if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) | |
3871 | return -EINVAL; | |
fca5fdf6 | 3872 | if (unlikely(size > IP_TUNNEL_OPTS_MAX)) |
14ca0751 DB |
3873 | return -ENOMEM; |
3874 | ||
256c87c1 | 3875 | ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT); |
14ca0751 DB |
3876 | |
3877 | return 0; | |
3878 | } | |
3879 | ||
3880 | static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { | |
3881 | .func = bpf_skb_set_tunnel_opt, | |
3882 | .gpl_only = false, | |
3883 | .ret_type = RET_INTEGER, | |
3884 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
3885 | .arg2_type = ARG_PTR_TO_MEM, |
3886 | .arg3_type = ARG_CONST_SIZE, | |
14ca0751 DB |
3887 | }; |
3888 | ||
3889 | static const struct bpf_func_proto * | |
3890 | bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) | |
d3aa45ce AS |
3891 | { |
3892 | if (!md_dst) { | |
d66f2b91 JK |
3893 | struct metadata_dst __percpu *tmp; |
3894 | ||
3895 | tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, | |
3896 | METADATA_IP_TUNNEL, | |
3897 | GFP_KERNEL); | |
3898 | if (!tmp) | |
d3aa45ce | 3899 | return NULL; |
d66f2b91 JK |
3900 | if (cmpxchg(&md_dst, NULL, tmp)) |
3901 | metadata_dst_free_percpu(tmp); | |
d3aa45ce | 3902 | } |
14ca0751 DB |
3903 | |
3904 | switch (which) { | |
3905 | case BPF_FUNC_skb_set_tunnel_key: | |
3906 | return &bpf_skb_set_tunnel_key_proto; | |
3907 | case BPF_FUNC_skb_set_tunnel_opt: | |
3908 | return &bpf_skb_set_tunnel_opt_proto; | |
3909 | default: | |
3910 | return NULL; | |
3911 | } | |
d3aa45ce AS |
3912 | } |
3913 | ||
f3694e00 DB |
3914 | BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, |
3915 | u32, idx) | |
4a482f34 | 3916 | { |
4a482f34 MKL |
3917 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
3918 | struct cgroup *cgrp; | |
3919 | struct sock *sk; | |
4a482f34 | 3920 | |
2d48c5f9 | 3921 | sk = skb_to_full_sk(skb); |
4a482f34 MKL |
3922 | if (!sk || !sk_fullsock(sk)) |
3923 | return -ENOENT; | |
f3694e00 | 3924 | if (unlikely(idx >= array->map.max_entries)) |
4a482f34 MKL |
3925 | return -E2BIG; |
3926 | ||
f3694e00 | 3927 | cgrp = READ_ONCE(array->ptrs[idx]); |
4a482f34 MKL |
3928 | if (unlikely(!cgrp)) |
3929 | return -EAGAIN; | |
3930 | ||
54fd9c2d | 3931 | return sk_under_cgroup_hierarchy(sk, cgrp); |
4a482f34 MKL |
3932 | } |
3933 | ||
747ea55e DB |
3934 | static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { |
3935 | .func = bpf_skb_under_cgroup, | |
4a482f34 MKL |
3936 | .gpl_only = false, |
3937 | .ret_type = RET_INTEGER, | |
3938 | .arg1_type = ARG_PTR_TO_CTX, | |
3939 | .arg2_type = ARG_CONST_MAP_PTR, | |
3940 | .arg3_type = ARG_ANYTHING, | |
3941 | }; | |
4a482f34 | 3942 | |
cb20b08e DB |
3943 | #ifdef CONFIG_SOCK_CGROUP_DATA |
3944 | BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb) | |
3945 | { | |
3946 | struct sock *sk = skb_to_full_sk(skb); | |
3947 | struct cgroup *cgrp; | |
3948 | ||
3949 | if (!sk || !sk_fullsock(sk)) | |
3950 | return 0; | |
3951 | ||
3952 | cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); | |
3953 | return cgrp->kn->id.id; | |
3954 | } | |
3955 | ||
3956 | static const struct bpf_func_proto bpf_skb_cgroup_id_proto = { | |
3957 | .func = bpf_skb_cgroup_id, | |
3958 | .gpl_only = false, | |
3959 | .ret_type = RET_INTEGER, | |
3960 | .arg1_type = ARG_PTR_TO_CTX, | |
3961 | }; | |
77236281 AI |
3962 | |
3963 | BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int, | |
3964 | ancestor_level) | |
3965 | { | |
3966 | struct sock *sk = skb_to_full_sk(skb); | |
3967 | struct cgroup *ancestor; | |
3968 | struct cgroup *cgrp; | |
3969 | ||
3970 | if (!sk || !sk_fullsock(sk)) | |
3971 | return 0; | |
3972 | ||
3973 | cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); | |
3974 | ancestor = cgroup_ancestor(cgrp, ancestor_level); | |
3975 | if (!ancestor) | |
3976 | return 0; | |
3977 | ||
3978 | return ancestor->kn->id.id; | |
3979 | } | |
3980 | ||
3981 | static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = { | |
3982 | .func = bpf_skb_ancestor_cgroup_id, | |
3983 | .gpl_only = false, | |
3984 | .ret_type = RET_INTEGER, | |
3985 | .arg1_type = ARG_PTR_TO_CTX, | |
3986 | .arg2_type = ARG_ANYTHING, | |
3987 | }; | |
cb20b08e DB |
3988 | #endif |
3989 | ||
4de16969 DB |
3990 | static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff, |
3991 | unsigned long off, unsigned long len) | |
3992 | { | |
3993 | memcpy(dst_buff, src_buff + off, len); | |
3994 | return 0; | |
3995 | } | |
3996 | ||
f3694e00 DB |
3997 | BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, |
3998 | u64, flags, void *, meta, u64, meta_size) | |
4de16969 | 3999 | { |
4de16969 | 4000 | u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; |
4de16969 DB |
4001 | |
4002 | if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) | |
4003 | return -EINVAL; | |
4004 | if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data))) | |
4005 | return -EFAULT; | |
4006 | ||
9c471370 MKL |
4007 | return bpf_event_output(map, flags, meta, meta_size, xdp->data, |
4008 | xdp_size, bpf_xdp_copy); | |
4de16969 DB |
4009 | } |
4010 | ||
4011 | static const struct bpf_func_proto bpf_xdp_event_output_proto = { | |
4012 | .func = bpf_xdp_event_output, | |
4013 | .gpl_only = true, | |
4014 | .ret_type = RET_INTEGER, | |
4015 | .arg1_type = ARG_PTR_TO_CTX, | |
4016 | .arg2_type = ARG_CONST_MAP_PTR, | |
4017 | .arg3_type = ARG_ANYTHING, | |
39f19ebb | 4018 | .arg4_type = ARG_PTR_TO_MEM, |
1728a4f2 | 4019 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
4de16969 DB |
4020 | }; |
4021 | ||
91b8270f CF |
4022 | BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) |
4023 | { | |
4024 | return skb->sk ? sock_gen_cookie(skb->sk) : 0; | |
4025 | } | |
4026 | ||
4027 | static const struct bpf_func_proto bpf_get_socket_cookie_proto = { | |
4028 | .func = bpf_get_socket_cookie, | |
4029 | .gpl_only = false, | |
4030 | .ret_type = RET_INTEGER, | |
4031 | .arg1_type = ARG_PTR_TO_CTX, | |
4032 | }; | |
4033 | ||
d692f113 AI |
4034 | BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) |
4035 | { | |
4036 | return sock_gen_cookie(ctx->sk); | |
4037 | } | |
4038 | ||
4039 | static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = { | |
4040 | .func = bpf_get_socket_cookie_sock_addr, | |
4041 | .gpl_only = false, | |
4042 | .ret_type = RET_INTEGER, | |
4043 | .arg1_type = ARG_PTR_TO_CTX, | |
4044 | }; | |
4045 | ||
4046 | BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) | |
4047 | { | |
4048 | return sock_gen_cookie(ctx->sk); | |
4049 | } | |
4050 | ||
4051 | static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = { | |
4052 | .func = bpf_get_socket_cookie_sock_ops, | |
4053 | .gpl_only = false, | |
4054 | .ret_type = RET_INTEGER, | |
4055 | .arg1_type = ARG_PTR_TO_CTX, | |
4056 | }; | |
4057 | ||
6acc5c29 CF |
4058 | BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) |
4059 | { | |
4060 | struct sock *sk = sk_to_full_sk(skb->sk); | |
4061 | kuid_t kuid; | |
4062 | ||
4063 | if (!sk || !sk_fullsock(sk)) | |
4064 | return overflowuid; | |
4065 | kuid = sock_net_uid(sock_net(sk), sk); | |
4066 | return from_kuid_munged(sock_net(sk)->user_ns, kuid); | |
4067 | } | |
4068 | ||
4069 | static const struct bpf_func_proto bpf_get_socket_uid_proto = { | |
4070 | .func = bpf_get_socket_uid, | |
4071 | .gpl_only = false, | |
4072 | .ret_type = RET_INTEGER, | |
4073 | .arg1_type = ARG_PTR_TO_CTX, | |
4074 | }; | |
4075 | ||
a5a3a828 SV |
4076 | BPF_CALL_5(bpf_sockopt_event_output, struct bpf_sock_ops_kern *, bpf_sock, |
4077 | struct bpf_map *, map, u64, flags, void *, data, u64, size) | |
4078 | { | |
4079 | if (unlikely(flags & ~(BPF_F_INDEX_MASK))) | |
4080 | return -EINVAL; | |
4081 | ||
4082 | return bpf_event_output(map, flags, data, size, NULL, 0, NULL); | |
4083 | } | |
4084 | ||
4085 | static const struct bpf_func_proto bpf_sockopt_event_output_proto = { | |
4086 | .func = bpf_sockopt_event_output, | |
4087 | .gpl_only = true, | |
4088 | .ret_type = RET_INTEGER, | |
4089 | .arg1_type = ARG_PTR_TO_CTX, | |
4090 | .arg2_type = ARG_CONST_MAP_PTR, | |
4091 | .arg3_type = ARG_ANYTHING, | |
4092 | .arg4_type = ARG_PTR_TO_MEM, | |
4093 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, | |
4094 | }; | |
4095 | ||
8c4b4c7e LB |
4096 | BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, |
4097 | int, level, int, optname, char *, optval, int, optlen) | |
4098 | { | |
4099 | struct sock *sk = bpf_sock->sk; | |
4100 | int ret = 0; | |
4101 | int val; | |
4102 | ||
4103 | if (!sk_fullsock(sk)) | |
4104 | return -EINVAL; | |
4105 | ||
4106 | if (level == SOL_SOCKET) { | |
4107 | if (optlen != sizeof(int)) | |
4108 | return -EINVAL; | |
4109 | val = *((int *)optval); | |
4110 | ||
4111 | /* Only some socketops are supported */ | |
4112 | switch (optname) { | |
4113 | case SO_RCVBUF: | |
4114 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
4115 | sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); | |
4116 | break; | |
4117 | case SO_SNDBUF: | |
4118 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
4119 | sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); | |
4120 | break; | |
76a9ebe8 ED |
4121 | case SO_MAX_PACING_RATE: /* 32bit version */ |
4122 | sk->sk_max_pacing_rate = (val == ~0U) ? ~0UL : val; | |
8c4b4c7e LB |
4123 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, |
4124 | sk->sk_max_pacing_rate); | |
4125 | break; | |
4126 | case SO_PRIORITY: | |
4127 | sk->sk_priority = val; | |
4128 | break; | |
4129 | case SO_RCVLOWAT: | |
4130 | if (val < 0) | |
4131 | val = INT_MAX; | |
4132 | sk->sk_rcvlowat = val ? : 1; | |
4133 | break; | |
4134 | case SO_MARK: | |
4135 | sk->sk_mark = val; | |
4136 | break; | |
4137 | default: | |
4138 | ret = -EINVAL; | |
4139 | } | |
a5192c52 | 4140 | #ifdef CONFIG_INET |
6f5c39fa NS |
4141 | } else if (level == SOL_IP) { |
4142 | if (optlen != sizeof(int) || sk->sk_family != AF_INET) | |
4143 | return -EINVAL; | |
4144 | ||
4145 | val = *((int *)optval); | |
4146 | /* Only some options are supported */ | |
4147 | switch (optname) { | |
4148 | case IP_TOS: | |
4149 | if (val < -1 || val > 0xff) { | |
4150 | ret = -EINVAL; | |
4151 | } else { | |
4152 | struct inet_sock *inet = inet_sk(sk); | |
4153 | ||
4154 | if (val == -1) | |
4155 | val = 0; | |
4156 | inet->tos = val; | |
4157 | } | |
4158 | break; | |
4159 | default: | |
4160 | ret = -EINVAL; | |
4161 | } | |
6f9bd3d7 LB |
4162 | #if IS_ENABLED(CONFIG_IPV6) |
4163 | } else if (level == SOL_IPV6) { | |
4164 | if (optlen != sizeof(int) || sk->sk_family != AF_INET6) | |
4165 | return -EINVAL; | |
4166 | ||
4167 | val = *((int *)optval); | |
4168 | /* Only some options are supported */ | |
4169 | switch (optname) { | |
4170 | case IPV6_TCLASS: | |
4171 | if (val < -1 || val > 0xff) { | |
4172 | ret = -EINVAL; | |
4173 | } else { | |
4174 | struct ipv6_pinfo *np = inet6_sk(sk); | |
4175 | ||
4176 | if (val == -1) | |
4177 | val = 0; | |
4178 | np->tclass = val; | |
4179 | } | |
4180 | break; | |
4181 | default: | |
4182 | ret = -EINVAL; | |
4183 | } | |
4184 | #endif | |
8c4b4c7e LB |
4185 | } else if (level == SOL_TCP && |
4186 | sk->sk_prot->setsockopt == tcp_setsockopt) { | |
91b5b21c LB |
4187 | if (optname == TCP_CONGESTION) { |
4188 | char name[TCP_CA_NAME_MAX]; | |
ebfa00c5 | 4189 | bool reinit = bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN; |
91b5b21c LB |
4190 | |
4191 | strncpy(name, optval, min_t(long, optlen, | |
4192 | TCP_CA_NAME_MAX-1)); | |
4193 | name[TCP_CA_NAME_MAX-1] = 0; | |
6f9bd3d7 LB |
4194 | ret = tcp_set_congestion_control(sk, name, false, |
4195 | reinit); | |
91b5b21c | 4196 | } else { |
fc747810 LB |
4197 | struct tcp_sock *tp = tcp_sk(sk); |
4198 | ||
4199 | if (optlen != sizeof(int)) | |
4200 | return -EINVAL; | |
4201 | ||
4202 | val = *((int *)optval); | |
4203 | /* Only some options are supported */ | |
4204 | switch (optname) { | |
4205 | case TCP_BPF_IW: | |
4206 | if (val <= 0 || tp->data_segs_out > 0) | |
4207 | ret = -EINVAL; | |
4208 | else | |
4209 | tp->snd_cwnd = val; | |
4210 | break; | |
13bf9641 LB |
4211 | case TCP_BPF_SNDCWND_CLAMP: |
4212 | if (val <= 0) { | |
4213 | ret = -EINVAL; | |
4214 | } else { | |
4215 | tp->snd_cwnd_clamp = val; | |
4216 | tp->snd_ssthresh = val; | |
4217 | } | |
6d3f06a0 | 4218 | break; |
1e215300 NS |
4219 | case TCP_SAVE_SYN: |
4220 | if (val < 0 || val > 1) | |
4221 | ret = -EINVAL; | |
4222 | else | |
4223 | tp->save_syn = val; | |
4224 | break; | |
fc747810 LB |
4225 | default: |
4226 | ret = -EINVAL; | |
4227 | } | |
91b5b21c | 4228 | } |
91b5b21c | 4229 | #endif |
8c4b4c7e LB |
4230 | } else { |
4231 | ret = -EINVAL; | |
4232 | } | |
4233 | return ret; | |
4234 | } | |
4235 | ||
4236 | static const struct bpf_func_proto bpf_setsockopt_proto = { | |
4237 | .func = bpf_setsockopt, | |
cd86d1fd | 4238 | .gpl_only = false, |
8c4b4c7e LB |
4239 | .ret_type = RET_INTEGER, |
4240 | .arg1_type = ARG_PTR_TO_CTX, | |
4241 | .arg2_type = ARG_ANYTHING, | |
4242 | .arg3_type = ARG_ANYTHING, | |
4243 | .arg4_type = ARG_PTR_TO_MEM, | |
4244 | .arg5_type = ARG_CONST_SIZE, | |
4245 | }; | |
4246 | ||
cd86d1fd LB |
4247 | BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, |
4248 | int, level, int, optname, char *, optval, int, optlen) | |
4249 | { | |
4250 | struct sock *sk = bpf_sock->sk; | |
cd86d1fd LB |
4251 | |
4252 | if (!sk_fullsock(sk)) | |
4253 | goto err_clear; | |
cd86d1fd LB |
4254 | #ifdef CONFIG_INET |
4255 | if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) { | |
1edb6e03 AR |
4256 | struct inet_connection_sock *icsk; |
4257 | struct tcp_sock *tp; | |
4258 | ||
1e215300 NS |
4259 | switch (optname) { |
4260 | case TCP_CONGESTION: | |
4261 | icsk = inet_csk(sk); | |
cd86d1fd LB |
4262 | |
4263 | if (!icsk->icsk_ca_ops || optlen <= 1) | |
4264 | goto err_clear; | |
4265 | strncpy(optval, icsk->icsk_ca_ops->name, optlen); | |
4266 | optval[optlen - 1] = 0; | |
1e215300 NS |
4267 | break; |
4268 | case TCP_SAVED_SYN: | |
4269 | tp = tcp_sk(sk); | |
4270 | ||
4271 | if (optlen <= 0 || !tp->saved_syn || | |
4272 | optlen > tp->saved_syn[0]) | |
4273 | goto err_clear; | |
4274 | memcpy(optval, tp->saved_syn + 1, optlen); | |
4275 | break; | |
4276 | default: | |
cd86d1fd LB |
4277 | goto err_clear; |
4278 | } | |
6f5c39fa NS |
4279 | } else if (level == SOL_IP) { |
4280 | struct inet_sock *inet = inet_sk(sk); | |
4281 | ||
4282 | if (optlen != sizeof(int) || sk->sk_family != AF_INET) | |
4283 | goto err_clear; | |
4284 | ||
4285 | /* Only some options are supported */ | |
4286 | switch (optname) { | |
4287 | case IP_TOS: | |
4288 | *((int *)optval) = (int)inet->tos; | |
4289 | break; | |
4290 | default: | |
4291 | goto err_clear; | |
4292 | } | |
6f9bd3d7 LB |
4293 | #if IS_ENABLED(CONFIG_IPV6) |
4294 | } else if (level == SOL_IPV6) { | |
4295 | struct ipv6_pinfo *np = inet6_sk(sk); | |
4296 | ||
4297 | if (optlen != sizeof(int) || sk->sk_family != AF_INET6) | |
4298 | goto err_clear; | |
4299 | ||
4300 | /* Only some options are supported */ | |
4301 | switch (optname) { | |
4302 | case IPV6_TCLASS: | |
4303 | *((int *)optval) = (int)np->tclass; | |
4304 | break; | |
4305 | default: | |
4306 | goto err_clear; | |
4307 | } | |
4308 | #endif | |
cd86d1fd LB |
4309 | } else { |
4310 | goto err_clear; | |
4311 | } | |
aa2bc739 | 4312 | return 0; |
cd86d1fd LB |
4313 | #endif |
4314 | err_clear: | |
4315 | memset(optval, 0, optlen); | |
4316 | return -EINVAL; | |
4317 | } | |
4318 | ||
4319 | static const struct bpf_func_proto bpf_getsockopt_proto = { | |
4320 | .func = bpf_getsockopt, | |
4321 | .gpl_only = false, | |
4322 | .ret_type = RET_INTEGER, | |
4323 | .arg1_type = ARG_PTR_TO_CTX, | |
4324 | .arg2_type = ARG_ANYTHING, | |
4325 | .arg3_type = ARG_ANYTHING, | |
4326 | .arg4_type = ARG_PTR_TO_UNINIT_MEM, | |
4327 | .arg5_type = ARG_CONST_SIZE, | |
4328 | }; | |
4329 | ||
b13d8807 LB |
4330 | BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock, |
4331 | int, argval) | |
4332 | { | |
4333 | struct sock *sk = bpf_sock->sk; | |
4334 | int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS; | |
4335 | ||
a7dcdf6e | 4336 | if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk)) |
b13d8807 LB |
4337 | return -EINVAL; |
4338 | ||
b13d8807 LB |
4339 | if (val) |
4340 | tcp_sk(sk)->bpf_sock_ops_cb_flags = val; | |
4341 | ||
4342 | return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS); | |
b13d8807 LB |
4343 | } |
4344 | ||
4345 | static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = { | |
4346 | .func = bpf_sock_ops_cb_flags_set, | |
4347 | .gpl_only = false, | |
4348 | .ret_type = RET_INTEGER, | |
4349 | .arg1_type = ARG_PTR_TO_CTX, | |
4350 | .arg2_type = ARG_ANYTHING, | |
4351 | }; | |
4352 | ||
d74bad4e AI |
4353 | const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; |
4354 | EXPORT_SYMBOL_GPL(ipv6_bpf_stub); | |
4355 | ||
4356 | BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr, | |
4357 | int, addr_len) | |
4358 | { | |
4359 | #ifdef CONFIG_INET | |
4360 | struct sock *sk = ctx->sk; | |
4361 | int err; | |
4362 | ||
4363 | /* Binding to port can be expensive so it's prohibited in the helper. | |
4364 | * Only binding to IP is supported. | |
4365 | */ | |
4366 | err = -EINVAL; | |
4367 | if (addr->sa_family == AF_INET) { | |
4368 | if (addr_len < sizeof(struct sockaddr_in)) | |
4369 | return err; | |
4370 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
4371 | return err; | |
4372 | return __inet_bind(sk, addr, addr_len, true, false); | |
4373 | #if IS_ENABLED(CONFIG_IPV6) | |
4374 | } else if (addr->sa_family == AF_INET6) { | |
4375 | if (addr_len < SIN6_LEN_RFC2133) | |
4376 | return err; | |
4377 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
4378 | return err; | |
4379 | /* ipv6_bpf_stub cannot be NULL, since it's called from | |
4380 | * bpf_cgroup_inet6_connect hook and ipv6 is already loaded | |
4381 | */ | |
4382 | return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, true, false); | |
4383 | #endif /* CONFIG_IPV6 */ | |
4384 | } | |
4385 | #endif /* CONFIG_INET */ | |
4386 | ||
4387 | return -EAFNOSUPPORT; | |
4388 | } | |
4389 | ||
4390 | static const struct bpf_func_proto bpf_bind_proto = { | |
4391 | .func = bpf_bind, | |
4392 | .gpl_only = false, | |
4393 | .ret_type = RET_INTEGER, | |
4394 | .arg1_type = ARG_PTR_TO_CTX, | |
4395 | .arg2_type = ARG_PTR_TO_MEM, | |
4396 | .arg3_type = ARG_CONST_SIZE, | |
4397 | }; | |
4398 | ||
12bed760 EB |
4399 | #ifdef CONFIG_XFRM |
4400 | BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index, | |
4401 | struct bpf_xfrm_state *, to, u32, size, u64, flags) | |
4402 | { | |
4403 | const struct sec_path *sp = skb_sec_path(skb); | |
4404 | const struct xfrm_state *x; | |
4405 | ||
4406 | if (!sp || unlikely(index >= sp->len || flags)) | |
4407 | goto err_clear; | |
4408 | ||
4409 | x = sp->xvec[index]; | |
4410 | ||
4411 | if (unlikely(size != sizeof(struct bpf_xfrm_state))) | |
4412 | goto err_clear; | |
4413 | ||
4414 | to->reqid = x->props.reqid; | |
4415 | to->spi = x->id.spi; | |
4416 | to->family = x->props.family; | |
1fbc2e0c DB |
4417 | to->ext = 0; |
4418 | ||
12bed760 EB |
4419 | if (to->family == AF_INET6) { |
4420 | memcpy(to->remote_ipv6, x->props.saddr.a6, | |
4421 | sizeof(to->remote_ipv6)); | |
4422 | } else { | |
4423 | to->remote_ipv4 = x->props.saddr.a4; | |
1fbc2e0c | 4424 | memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); |
12bed760 EB |
4425 | } |
4426 | ||
4427 | return 0; | |
4428 | err_clear: | |
4429 | memset(to, 0, size); | |
4430 | return -EINVAL; | |
4431 | } | |
4432 | ||
4433 | static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = { | |
4434 | .func = bpf_skb_get_xfrm_state, | |
4435 | .gpl_only = false, | |
4436 | .ret_type = RET_INTEGER, | |
4437 | .arg1_type = ARG_PTR_TO_CTX, | |
4438 | .arg2_type = ARG_ANYTHING, | |
4439 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, | |
4440 | .arg4_type = ARG_CONST_SIZE, | |
4441 | .arg5_type = ARG_ANYTHING, | |
4442 | }; | |
4443 | #endif | |
4444 | ||
87f5fc7e DA |
4445 | #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6) |
4446 | static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params, | |
4447 | const struct neighbour *neigh, | |
4448 | const struct net_device *dev) | |
4449 | { | |
4450 | memcpy(params->dmac, neigh->ha, ETH_ALEN); | |
4451 | memcpy(params->smac, dev->dev_addr, ETH_ALEN); | |
4452 | params->h_vlan_TCI = 0; | |
4453 | params->h_vlan_proto = 0; | |
4c79579b | 4454 | params->ifindex = dev->ifindex; |
87f5fc7e | 4455 | |
4c79579b | 4456 | return 0; |
87f5fc7e DA |
4457 | } |
4458 | #endif | |
4459 | ||
4460 | #if IS_ENABLED(CONFIG_INET) | |
4461 | static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params, | |
4f74fede | 4462 | u32 flags, bool check_mtu) |
87f5fc7e DA |
4463 | { |
4464 | struct in_device *in_dev; | |
4465 | struct neighbour *neigh; | |
4466 | struct net_device *dev; | |
4467 | struct fib_result res; | |
4468 | struct fib_nh *nh; | |
4469 | struct flowi4 fl4; | |
4470 | int err; | |
4f74fede | 4471 | u32 mtu; |
87f5fc7e DA |
4472 | |
4473 | dev = dev_get_by_index_rcu(net, params->ifindex); | |
4474 | if (unlikely(!dev)) | |
4475 | return -ENODEV; | |
4476 | ||
4477 | /* verify forwarding is enabled on this interface */ | |
4478 | in_dev = __in_dev_get_rcu(dev); | |
4479 | if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev))) | |
4c79579b | 4480 | return BPF_FIB_LKUP_RET_FWD_DISABLED; |
87f5fc7e DA |
4481 | |
4482 | if (flags & BPF_FIB_LOOKUP_OUTPUT) { | |
4483 | fl4.flowi4_iif = 1; | |
4484 | fl4.flowi4_oif = params->ifindex; | |
4485 | } else { | |
4486 | fl4.flowi4_iif = params->ifindex; | |
4487 | fl4.flowi4_oif = 0; | |
4488 | } | |
4489 | fl4.flowi4_tos = params->tos & IPTOS_RT_MASK; | |
4490 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
4491 | fl4.flowi4_flags = 0; | |
4492 | ||
4493 | fl4.flowi4_proto = params->l4_protocol; | |
4494 | fl4.daddr = params->ipv4_dst; | |
4495 | fl4.saddr = params->ipv4_src; | |
4496 | fl4.fl4_sport = params->sport; | |
4497 | fl4.fl4_dport = params->dport; | |
4498 | ||
4499 | if (flags & BPF_FIB_LOOKUP_DIRECT) { | |
4500 | u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; | |
4501 | struct fib_table *tb; | |
4502 | ||
4503 | tb = fib_get_table(net, tbid); | |
4504 | if (unlikely(!tb)) | |
4c79579b | 4505 | return BPF_FIB_LKUP_RET_NOT_FWDED; |
87f5fc7e DA |
4506 | |
4507 | err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); | |
4508 | } else { | |
4509 | fl4.flowi4_mark = 0; | |
4510 | fl4.flowi4_secid = 0; | |
4511 | fl4.flowi4_tun_key.tun_id = 0; | |
4512 | fl4.flowi4_uid = sock_net_uid(net, NULL); | |
4513 | ||
4514 | err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF); | |
4515 | } | |
4516 | ||
4c79579b DA |
4517 | if (err) { |
4518 | /* map fib lookup errors to RTN_ type */ | |
4519 | if (err == -EINVAL) | |
4520 | return BPF_FIB_LKUP_RET_BLACKHOLE; | |
4521 | if (err == -EHOSTUNREACH) | |
4522 | return BPF_FIB_LKUP_RET_UNREACHABLE; | |
4523 | if (err == -EACCES) | |
4524 | return BPF_FIB_LKUP_RET_PROHIBIT; | |
4525 | ||
4526 | return BPF_FIB_LKUP_RET_NOT_FWDED; | |
4527 | } | |
4528 | ||
4529 | if (res.type != RTN_UNICAST) | |
4530 | return BPF_FIB_LKUP_RET_NOT_FWDED; | |
87f5fc7e DA |
4531 | |
4532 | if (res.fi->fib_nhs > 1) | |
4533 | fib_select_path(net, &res, &fl4, NULL); | |
4534 | ||
4f74fede DA |
4535 | if (check_mtu) { |
4536 | mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst); | |
4537 | if (params->tot_len > mtu) | |
4c79579b | 4538 | return BPF_FIB_LKUP_RET_FRAG_NEEDED; |
4f74fede DA |
4539 | } |
4540 | ||
87f5fc7e DA |
4541 | nh = &res.fi->fib_nh[res.nh_sel]; |
4542 | ||
4543 | /* do not handle lwt encaps right now */ | |
4544 | if (nh->nh_lwtstate) | |
4c79579b | 4545 | return BPF_FIB_LKUP_RET_UNSUPP_LWT; |
87f5fc7e DA |
4546 | |
4547 | dev = nh->nh_dev; | |
87f5fc7e DA |
4548 | if (nh->nh_gw) |
4549 | params->ipv4_dst = nh->nh_gw; | |
4550 | ||
4551 | params->rt_metric = res.fi->fib_priority; | |
4552 | ||
4553 | /* xdp and cls_bpf programs are run in RCU-bh so | |
4554 | * rcu_read_lock_bh is not needed here | |
4555 | */ | |
4556 | neigh = __ipv4_neigh_lookup_noref(dev, (__force u32)params->ipv4_dst); | |
4c79579b DA |
4557 | if (!neigh) |
4558 | return BPF_FIB_LKUP_RET_NO_NEIGH; | |
87f5fc7e | 4559 | |
4c79579b | 4560 | return bpf_fib_set_fwd_params(params, neigh, dev); |
87f5fc7e DA |
4561 | } |
4562 | #endif | |
4563 | ||
4564 | #if IS_ENABLED(CONFIG_IPV6) | |
4565 | static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params, | |
4f74fede | 4566 | u32 flags, bool check_mtu) |
87f5fc7e DA |
4567 | { |
4568 | struct in6_addr *src = (struct in6_addr *) params->ipv6_src; | |
4569 | struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst; | |
4570 | struct neighbour *neigh; | |
4571 | struct net_device *dev; | |
4572 | struct inet6_dev *idev; | |
4573 | struct fib6_info *f6i; | |
4574 | struct flowi6 fl6; | |
4575 | int strict = 0; | |
4576 | int oif; | |
4f74fede | 4577 | u32 mtu; |
87f5fc7e DA |
4578 | |
4579 | /* link local addresses are never forwarded */ | |
4580 | if (rt6_need_strict(dst) || rt6_need_strict(src)) | |
4c79579b | 4581 | return BPF_FIB_LKUP_RET_NOT_FWDED; |
87f5fc7e DA |
4582 | |
4583 | dev = dev_get_by_index_rcu(net, params->ifindex); | |
4584 | if (unlikely(!dev)) | |
4585 | return -ENODEV; | |
4586 | ||
4587 | idev = __in6_dev_get_safely(dev); | |
4588 | if (unlikely(!idev || !net->ipv6.devconf_all->forwarding)) | |
4c79579b | 4589 | return BPF_FIB_LKUP_RET_FWD_DISABLED; |
87f5fc7e DA |
4590 | |
4591 | if (flags & BPF_FIB_LOOKUP_OUTPUT) { | |
4592 | fl6.flowi6_iif = 1; | |
4593 | oif = fl6.flowi6_oif = params->ifindex; | |
4594 | } else { | |
4595 | oif = fl6.flowi6_iif = params->ifindex; | |
4596 | fl6.flowi6_oif = 0; | |
4597 | strict = RT6_LOOKUP_F_HAS_SADDR; | |
4598 | } | |
bd3a08aa | 4599 | fl6.flowlabel = params->flowinfo; |
87f5fc7e DA |
4600 | fl6.flowi6_scope = 0; |
4601 | fl6.flowi6_flags = 0; | |
4602 | fl6.mp_hash = 0; | |
4603 | ||
4604 | fl6.flowi6_proto = params->l4_protocol; | |
4605 | fl6.daddr = *dst; | |
4606 | fl6.saddr = *src; | |
4607 | fl6.fl6_sport = params->sport; | |
4608 | fl6.fl6_dport = params->dport; | |
4609 | ||
4610 | if (flags & BPF_FIB_LOOKUP_DIRECT) { | |
4611 | u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; | |
4612 | struct fib6_table *tb; | |
4613 | ||
4614 | tb = ipv6_stub->fib6_get_table(net, tbid); | |
4615 | if (unlikely(!tb)) | |
4c79579b | 4616 | return BPF_FIB_LKUP_RET_NOT_FWDED; |
87f5fc7e DA |
4617 | |
4618 | f6i = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, strict); | |
4619 | } else { | |
4620 | fl6.flowi6_mark = 0; | |
4621 | fl6.flowi6_secid = 0; | |
4622 | fl6.flowi6_tun_key.tun_id = 0; | |
4623 | fl6.flowi6_uid = sock_net_uid(net, NULL); | |
4624 | ||
4625 | f6i = ipv6_stub->fib6_lookup(net, oif, &fl6, strict); | |
4626 | } | |
4627 | ||
4628 | if (unlikely(IS_ERR_OR_NULL(f6i) || f6i == net->ipv6.fib6_null_entry)) | |
4c79579b DA |
4629 | return BPF_FIB_LKUP_RET_NOT_FWDED; |
4630 | ||
4631 | if (unlikely(f6i->fib6_flags & RTF_REJECT)) { | |
4632 | switch (f6i->fib6_type) { | |
4633 | case RTN_BLACKHOLE: | |
4634 | return BPF_FIB_LKUP_RET_BLACKHOLE; | |
4635 | case RTN_UNREACHABLE: | |
4636 | return BPF_FIB_LKUP_RET_UNREACHABLE; | |
4637 | case RTN_PROHIBIT: | |
4638 | return BPF_FIB_LKUP_RET_PROHIBIT; | |
4639 | default: | |
4640 | return BPF_FIB_LKUP_RET_NOT_FWDED; | |
4641 | } | |
4642 | } | |
87f5fc7e | 4643 | |
4c79579b DA |
4644 | if (f6i->fib6_type != RTN_UNICAST) |
4645 | return BPF_FIB_LKUP_RET_NOT_FWDED; | |
87f5fc7e DA |
4646 | |
4647 | if (f6i->fib6_nsiblings && fl6.flowi6_oif == 0) | |
4648 | f6i = ipv6_stub->fib6_multipath_select(net, f6i, &fl6, | |
4649 | fl6.flowi6_oif, NULL, | |
4650 | strict); | |
4651 | ||
4f74fede DA |
4652 | if (check_mtu) { |
4653 | mtu = ipv6_stub->ip6_mtu_from_fib6(f6i, dst, src); | |
4654 | if (params->tot_len > mtu) | |
4c79579b | 4655 | return BPF_FIB_LKUP_RET_FRAG_NEEDED; |
4f74fede DA |
4656 | } |
4657 | ||
87f5fc7e | 4658 | if (f6i->fib6_nh.nh_lwtstate) |
4c79579b | 4659 | return BPF_FIB_LKUP_RET_UNSUPP_LWT; |
87f5fc7e DA |
4660 | |
4661 | if (f6i->fib6_flags & RTF_GATEWAY) | |
4662 | *dst = f6i->fib6_nh.nh_gw; | |
4663 | ||
4664 | dev = f6i->fib6_nh.nh_dev; | |
4665 | params->rt_metric = f6i->fib6_metric; | |
4666 | ||
4667 | /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is | |
4668 | * not needed here. Can not use __ipv6_neigh_lookup_noref here | |
4669 | * because we need to get nd_tbl via the stub | |
4670 | */ | |
4671 | neigh = ___neigh_lookup_noref(ipv6_stub->nd_tbl, neigh_key_eq128, | |
4672 | ndisc_hashfn, dst, dev); | |
4c79579b DA |
4673 | if (!neigh) |
4674 | return BPF_FIB_LKUP_RET_NO_NEIGH; | |
87f5fc7e | 4675 | |
4c79579b | 4676 | return bpf_fib_set_fwd_params(params, neigh, dev); |
87f5fc7e DA |
4677 | } |
4678 | #endif | |
4679 | ||
4680 | BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx, | |
4681 | struct bpf_fib_lookup *, params, int, plen, u32, flags) | |
4682 | { | |
4683 | if (plen < sizeof(*params)) | |
4684 | return -EINVAL; | |
4685 | ||
9ce64f19 DA |
4686 | if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) |
4687 | return -EINVAL; | |
4688 | ||
87f5fc7e DA |
4689 | switch (params->family) { |
4690 | #if IS_ENABLED(CONFIG_INET) | |
4691 | case AF_INET: | |
4692 | return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params, | |
4f74fede | 4693 | flags, true); |
87f5fc7e DA |
4694 | #endif |
4695 | #if IS_ENABLED(CONFIG_IPV6) | |
4696 | case AF_INET6: | |
4697 | return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params, | |
4f74fede | 4698 | flags, true); |
87f5fc7e DA |
4699 | #endif |
4700 | } | |
bcece5dc | 4701 | return -EAFNOSUPPORT; |
87f5fc7e DA |
4702 | } |
4703 | ||
4704 | static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = { | |
4705 | .func = bpf_xdp_fib_lookup, | |
4706 | .gpl_only = true, | |
4707 | .ret_type = RET_INTEGER, | |
4708 | .arg1_type = ARG_PTR_TO_CTX, | |
4709 | .arg2_type = ARG_PTR_TO_MEM, | |
4710 | .arg3_type = ARG_CONST_SIZE, | |
4711 | .arg4_type = ARG_ANYTHING, | |
4712 | }; | |
4713 | ||
4714 | BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb, | |
4715 | struct bpf_fib_lookup *, params, int, plen, u32, flags) | |
4716 | { | |
4f74fede | 4717 | struct net *net = dev_net(skb->dev); |
4c79579b | 4718 | int rc = -EAFNOSUPPORT; |
4f74fede | 4719 | |
87f5fc7e DA |
4720 | if (plen < sizeof(*params)) |
4721 | return -EINVAL; | |
4722 | ||
9ce64f19 DA |
4723 | if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) |
4724 | return -EINVAL; | |
4725 | ||
87f5fc7e DA |
4726 | switch (params->family) { |
4727 | #if IS_ENABLED(CONFIG_INET) | |
4728 | case AF_INET: | |
4c79579b | 4729 | rc = bpf_ipv4_fib_lookup(net, params, flags, false); |
4f74fede | 4730 | break; |
87f5fc7e DA |
4731 | #endif |
4732 | #if IS_ENABLED(CONFIG_IPV6) | |
4733 | case AF_INET6: | |
4c79579b | 4734 | rc = bpf_ipv6_fib_lookup(net, params, flags, false); |
4f74fede | 4735 | break; |
87f5fc7e DA |
4736 | #endif |
4737 | } | |
4f74fede | 4738 | |
4c79579b | 4739 | if (!rc) { |
4f74fede DA |
4740 | struct net_device *dev; |
4741 | ||
4c79579b | 4742 | dev = dev_get_by_index_rcu(net, params->ifindex); |
4f74fede | 4743 | if (!is_skb_forwardable(dev, skb)) |
4c79579b | 4744 | rc = BPF_FIB_LKUP_RET_FRAG_NEEDED; |
4f74fede DA |
4745 | } |
4746 | ||
4c79579b | 4747 | return rc; |
87f5fc7e DA |
4748 | } |
4749 | ||
4750 | static const struct bpf_func_proto bpf_skb_fib_lookup_proto = { | |
4751 | .func = bpf_skb_fib_lookup, | |
4752 | .gpl_only = true, | |
4753 | .ret_type = RET_INTEGER, | |
4754 | .arg1_type = ARG_PTR_TO_CTX, | |
4755 | .arg2_type = ARG_PTR_TO_MEM, | |
4756 | .arg3_type = ARG_CONST_SIZE, | |
4757 | .arg4_type = ARG_ANYTHING, | |
4758 | }; | |
4759 | ||
fe94cc29 MX |
4760 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
4761 | static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len) | |
4762 | { | |
4763 | int err; | |
4764 | struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr; | |
4765 | ||
4766 | if (!seg6_validate_srh(srh, len)) | |
4767 | return -EINVAL; | |
4768 | ||
4769 | switch (type) { | |
4770 | case BPF_LWT_ENCAP_SEG6_INLINE: | |
4771 | if (skb->protocol != htons(ETH_P_IPV6)) | |
4772 | return -EBADMSG; | |
4773 | ||
4774 | err = seg6_do_srh_inline(skb, srh); | |
4775 | break; | |
4776 | case BPF_LWT_ENCAP_SEG6: | |
4777 | skb_reset_inner_headers(skb); | |
4778 | skb->encapsulation = 1; | |
4779 | err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6); | |
4780 | break; | |
4781 | default: | |
4782 | return -EINVAL; | |
4783 | } | |
4784 | ||
4785 | bpf_compute_data_pointers(skb); | |
4786 | if (err) | |
4787 | return err; | |
4788 | ||
4789 | ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
4790 | skb_set_transport_header(skb, sizeof(struct ipv6hdr)); | |
4791 | ||
4792 | return seg6_lookup_nexthop(skb, NULL, 0); | |
4793 | } | |
4794 | #endif /* CONFIG_IPV6_SEG6_BPF */ | |
4795 | ||
4796 | BPF_CALL_4(bpf_lwt_push_encap, struct sk_buff *, skb, u32, type, void *, hdr, | |
4797 | u32, len) | |
4798 | { | |
4799 | switch (type) { | |
4800 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) | |
4801 | case BPF_LWT_ENCAP_SEG6: | |
4802 | case BPF_LWT_ENCAP_SEG6_INLINE: | |
4803 | return bpf_push_seg6_encap(skb, type, hdr, len); | |
4804 | #endif | |
4805 | default: | |
4806 | return -EINVAL; | |
4807 | } | |
4808 | } | |
4809 | ||
4810 | static const struct bpf_func_proto bpf_lwt_push_encap_proto = { | |
4811 | .func = bpf_lwt_push_encap, | |
4812 | .gpl_only = false, | |
4813 | .ret_type = RET_INTEGER, | |
4814 | .arg1_type = ARG_PTR_TO_CTX, | |
4815 | .arg2_type = ARG_ANYTHING, | |
4816 | .arg3_type = ARG_PTR_TO_MEM, | |
4817 | .arg4_type = ARG_CONST_SIZE | |
4818 | }; | |
4819 | ||
61d76980 | 4820 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
fe94cc29 MX |
4821 | BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset, |
4822 | const void *, from, u32, len) | |
4823 | { | |
fe94cc29 MX |
4824 | struct seg6_bpf_srh_state *srh_state = |
4825 | this_cpu_ptr(&seg6_bpf_srh_states); | |
486cdf21 | 4826 | struct ipv6_sr_hdr *srh = srh_state->srh; |
fe94cc29 | 4827 | void *srh_tlvs, *srh_end, *ptr; |
fe94cc29 MX |
4828 | int srhoff = 0; |
4829 | ||
486cdf21 | 4830 | if (srh == NULL) |
fe94cc29 MX |
4831 | return -EINVAL; |
4832 | ||
fe94cc29 MX |
4833 | srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4)); |
4834 | srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen); | |
4835 | ||
4836 | ptr = skb->data + offset; | |
4837 | if (ptr >= srh_tlvs && ptr + len <= srh_end) | |
486cdf21 | 4838 | srh_state->valid = false; |
fe94cc29 MX |
4839 | else if (ptr < (void *)&srh->flags || |
4840 | ptr + len > (void *)&srh->segments) | |
4841 | return -EFAULT; | |
4842 | ||
4843 | if (unlikely(bpf_try_make_writable(skb, offset + len))) | |
4844 | return -EFAULT; | |
486cdf21 MX |
4845 | if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) |
4846 | return -EINVAL; | |
4847 | srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); | |
fe94cc29 MX |
4848 | |
4849 | memcpy(skb->data + offset, from, len); | |
4850 | return 0; | |
fe94cc29 MX |
4851 | } |
4852 | ||
4853 | static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = { | |
4854 | .func = bpf_lwt_seg6_store_bytes, | |
4855 | .gpl_only = false, | |
4856 | .ret_type = RET_INTEGER, | |
4857 | .arg1_type = ARG_PTR_TO_CTX, | |
4858 | .arg2_type = ARG_ANYTHING, | |
4859 | .arg3_type = ARG_PTR_TO_MEM, | |
4860 | .arg4_type = ARG_CONST_SIZE | |
4861 | }; | |
4862 | ||
486cdf21 | 4863 | static void bpf_update_srh_state(struct sk_buff *skb) |
fe94cc29 | 4864 | { |
fe94cc29 MX |
4865 | struct seg6_bpf_srh_state *srh_state = |
4866 | this_cpu_ptr(&seg6_bpf_srh_states); | |
fe94cc29 | 4867 | int srhoff = 0; |
fe94cc29 | 4868 | |
486cdf21 MX |
4869 | if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) { |
4870 | srh_state->srh = NULL; | |
4871 | } else { | |
4872 | srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); | |
4873 | srh_state->hdrlen = srh_state->srh->hdrlen << 3; | |
4874 | srh_state->valid = true; | |
fe94cc29 | 4875 | } |
486cdf21 MX |
4876 | } |
4877 | ||
4878 | BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb, | |
4879 | u32, action, void *, param, u32, param_len) | |
4880 | { | |
4881 | struct seg6_bpf_srh_state *srh_state = | |
4882 | this_cpu_ptr(&seg6_bpf_srh_states); | |
4883 | int hdroff = 0; | |
4884 | int err; | |
fe94cc29 MX |
4885 | |
4886 | switch (action) { | |
4887 | case SEG6_LOCAL_ACTION_END_X: | |
486cdf21 MX |
4888 | if (!seg6_bpf_has_valid_srh(skb)) |
4889 | return -EBADMSG; | |
fe94cc29 MX |
4890 | if (param_len != sizeof(struct in6_addr)) |
4891 | return -EINVAL; | |
4892 | return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0); | |
4893 | case SEG6_LOCAL_ACTION_END_T: | |
486cdf21 MX |
4894 | if (!seg6_bpf_has_valid_srh(skb)) |
4895 | return -EBADMSG; | |
fe94cc29 MX |
4896 | if (param_len != sizeof(int)) |
4897 | return -EINVAL; | |
4898 | return seg6_lookup_nexthop(skb, NULL, *(int *)param); | |
486cdf21 MX |
4899 | case SEG6_LOCAL_ACTION_END_DT6: |
4900 | if (!seg6_bpf_has_valid_srh(skb)) | |
4901 | return -EBADMSG; | |
fe94cc29 MX |
4902 | if (param_len != sizeof(int)) |
4903 | return -EINVAL; | |
486cdf21 MX |
4904 | |
4905 | if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0) | |
4906 | return -EBADMSG; | |
4907 | if (!pskb_pull(skb, hdroff)) | |
4908 | return -EBADMSG; | |
4909 | ||
4910 | skb_postpull_rcsum(skb, skb_network_header(skb), hdroff); | |
4911 | skb_reset_network_header(skb); | |
4912 | skb_reset_transport_header(skb); | |
4913 | skb->encapsulation = 0; | |
4914 | ||
4915 | bpf_compute_data_pointers(skb); | |
4916 | bpf_update_srh_state(skb); | |
fe94cc29 MX |
4917 | return seg6_lookup_nexthop(skb, NULL, *(int *)param); |
4918 | case SEG6_LOCAL_ACTION_END_B6: | |
486cdf21 MX |
4919 | if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) |
4920 | return -EBADMSG; | |
fe94cc29 MX |
4921 | err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE, |
4922 | param, param_len); | |
4923 | if (!err) | |
486cdf21 MX |
4924 | bpf_update_srh_state(skb); |
4925 | ||
fe94cc29 MX |
4926 | return err; |
4927 | case SEG6_LOCAL_ACTION_END_B6_ENCAP: | |
486cdf21 MX |
4928 | if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) |
4929 | return -EBADMSG; | |
fe94cc29 MX |
4930 | err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6, |
4931 | param, param_len); | |
4932 | if (!err) | |
486cdf21 MX |
4933 | bpf_update_srh_state(skb); |
4934 | ||
fe94cc29 MX |
4935 | return err; |
4936 | default: | |
4937 | return -EINVAL; | |
4938 | } | |
fe94cc29 MX |
4939 | } |
4940 | ||
4941 | static const struct bpf_func_proto bpf_lwt_seg6_action_proto = { | |
4942 | .func = bpf_lwt_seg6_action, | |
4943 | .gpl_only = false, | |
4944 | .ret_type = RET_INTEGER, | |
4945 | .arg1_type = ARG_PTR_TO_CTX, | |
4946 | .arg2_type = ARG_ANYTHING, | |
4947 | .arg3_type = ARG_PTR_TO_MEM, | |
4948 | .arg4_type = ARG_CONST_SIZE | |
4949 | }; | |
4950 | ||
4951 | BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset, | |
4952 | s32, len) | |
4953 | { | |
fe94cc29 MX |
4954 | struct seg6_bpf_srh_state *srh_state = |
4955 | this_cpu_ptr(&seg6_bpf_srh_states); | |
486cdf21 | 4956 | struct ipv6_sr_hdr *srh = srh_state->srh; |
fe94cc29 | 4957 | void *srh_end, *srh_tlvs, *ptr; |
fe94cc29 MX |
4958 | struct ipv6hdr *hdr; |
4959 | int srhoff = 0; | |
4960 | int ret; | |
4961 | ||
486cdf21 | 4962 | if (unlikely(srh == NULL)) |
fe94cc29 | 4963 | return -EINVAL; |
fe94cc29 MX |
4964 | |
4965 | srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) + | |
4966 | ((srh->first_segment + 1) << 4)); | |
4967 | srh_end = (void *)((unsigned char *)srh + sizeof(*srh) + | |
4968 | srh_state->hdrlen); | |
4969 | ptr = skb->data + offset; | |
4970 | ||
4971 | if (unlikely(ptr < srh_tlvs || ptr > srh_end)) | |
4972 | return -EFAULT; | |
4973 | if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end)) | |
4974 | return -EFAULT; | |
4975 | ||
4976 | if (len > 0) { | |
4977 | ret = skb_cow_head(skb, len); | |
4978 | if (unlikely(ret < 0)) | |
4979 | return ret; | |
4980 | ||
4981 | ret = bpf_skb_net_hdr_push(skb, offset, len); | |
4982 | } else { | |
4983 | ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len); | |
4984 | } | |
4985 | ||
4986 | bpf_compute_data_pointers(skb); | |
4987 | if (unlikely(ret < 0)) | |
4988 | return ret; | |
4989 | ||
4990 | hdr = (struct ipv6hdr *)skb->data; | |
4991 | hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
4992 | ||
486cdf21 MX |
4993 | if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) |
4994 | return -EINVAL; | |
4995 | srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); | |
fe94cc29 | 4996 | srh_state->hdrlen += len; |
486cdf21 | 4997 | srh_state->valid = false; |
fe94cc29 | 4998 | return 0; |
fe94cc29 MX |
4999 | } |
5000 | ||
5001 | static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = { | |
5002 | .func = bpf_lwt_seg6_adjust_srh, | |
5003 | .gpl_only = false, | |
5004 | .ret_type = RET_INTEGER, | |
5005 | .arg1_type = ARG_PTR_TO_CTX, | |
5006 | .arg2_type = ARG_ANYTHING, | |
5007 | .arg3_type = ARG_ANYTHING, | |
5008 | }; | |
61d76980 | 5009 | #endif /* CONFIG_IPV6_SEG6_BPF */ |
fe94cc29 | 5010 | |
df3f94a0 AB |
5011 | #ifdef CONFIG_INET |
5012 | static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, | |
c8123ead | 5013 | int dif, int sdif, u8 family, u8 proto) |
6acc9b43 | 5014 | { |
6acc9b43 JS |
5015 | bool refcounted = false; |
5016 | struct sock *sk = NULL; | |
5017 | ||
5018 | if (family == AF_INET) { | |
5019 | __be32 src4 = tuple->ipv4.saddr; | |
5020 | __be32 dst4 = tuple->ipv4.daddr; | |
6acc9b43 JS |
5021 | |
5022 | if (proto == IPPROTO_TCP) | |
c8123ead | 5023 | sk = __inet_lookup(net, &tcp_hashinfo, NULL, 0, |
6acc9b43 JS |
5024 | src4, tuple->ipv4.sport, |
5025 | dst4, tuple->ipv4.dport, | |
5026 | dif, sdif, &refcounted); | |
5027 | else | |
5028 | sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport, | |
5029 | dst4, tuple->ipv4.dport, | |
c8123ead | 5030 | dif, sdif, &udp_table, NULL); |
8a615c6b | 5031 | #if IS_ENABLED(CONFIG_IPV6) |
6acc9b43 JS |
5032 | } else { |
5033 | struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr; | |
5034 | struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr; | |
6acc9b43 JS |
5035 | |
5036 | if (proto == IPPROTO_TCP) | |
c8123ead | 5037 | sk = __inet6_lookup(net, &tcp_hashinfo, NULL, 0, |
6acc9b43 | 5038 | src6, tuple->ipv6.sport, |
cac6cc2f | 5039 | dst6, ntohs(tuple->ipv6.dport), |
6acc9b43 | 5040 | dif, sdif, &refcounted); |
8a615c6b JS |
5041 | else if (likely(ipv6_bpf_stub)) |
5042 | sk = ipv6_bpf_stub->udp6_lib_lookup(net, | |
5043 | src6, tuple->ipv6.sport, | |
cac6cc2f | 5044 | dst6, tuple->ipv6.dport, |
8a615c6b | 5045 | dif, sdif, |
c8123ead | 5046 | &udp_table, NULL); |
6acc9b43 JS |
5047 | #endif |
5048 | } | |
5049 | ||
5050 | if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) { | |
5051 | WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); | |
5052 | sk = NULL; | |
5053 | } | |
5054 | return sk; | |
5055 | } | |
5056 | ||
5057 | /* bpf_sk_lookup performs the core lookup for different types of sockets, | |
5058 | * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE. | |
5059 | * Returns the socket as an 'unsigned long' to simplify the casting in the | |
5060 | * callers to satisfy BPF_CALL declarations. | |
5061 | */ | |
5062 | static unsigned long | |
c8123ead NH |
5063 | __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, |
5064 | struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, | |
5065 | u64 flags) | |
6acc9b43 | 5066 | { |
6acc9b43 JS |
5067 | struct sock *sk = NULL; |
5068 | u8 family = AF_UNSPEC; | |
5069 | struct net *net; | |
c8123ead | 5070 | int sdif; |
6acc9b43 JS |
5071 | |
5072 | family = len == sizeof(tuple->ipv4) ? AF_INET : AF_INET6; | |
f71c6143 JS |
5073 | if (unlikely(family == AF_UNSPEC || flags || |
5074 | !((s32)netns_id < 0 || netns_id <= S32_MAX))) | |
6acc9b43 JS |
5075 | goto out; |
5076 | ||
c8123ead NH |
5077 | if (family == AF_INET) |
5078 | sdif = inet_sdif(skb); | |
6acc9b43 | 5079 | else |
c8123ead NH |
5080 | sdif = inet6_sdif(skb); |
5081 | ||
f71c6143 JS |
5082 | if ((s32)netns_id < 0) { |
5083 | net = caller_net; | |
4cc1feeb | 5084 | sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); |
f71c6143 | 5085 | } else { |
6acc9b43 JS |
5086 | net = get_net_ns_by_id(caller_net, netns_id); |
5087 | if (unlikely(!net)) | |
5088 | goto out; | |
c8123ead | 5089 | sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); |
6acc9b43 | 5090 | put_net(net); |
6acc9b43 JS |
5091 | } |
5092 | ||
5093 | if (sk) | |
5094 | sk = sk_to_full_sk(sk); | |
5095 | out: | |
5096 | return (unsigned long) sk; | |
5097 | } | |
5098 | ||
c8123ead NH |
5099 | static unsigned long |
5100 | bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, | |
5101 | u8 proto, u64 netns_id, u64 flags) | |
5102 | { | |
5103 | struct net *caller_net; | |
5104 | int ifindex; | |
5105 | ||
5106 | if (skb->dev) { | |
5107 | caller_net = dev_net(skb->dev); | |
5108 | ifindex = skb->dev->ifindex; | |
5109 | } else { | |
5110 | caller_net = sock_net(skb->sk); | |
5111 | ifindex = 0; | |
5112 | } | |
5113 | ||
5114 | return __bpf_sk_lookup(skb, tuple, len, caller_net, ifindex, | |
5115 | proto, netns_id, flags); | |
5116 | } | |
5117 | ||
6acc9b43 JS |
5118 | BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb, |
5119 | struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) | |
5120 | { | |
5121 | return bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, netns_id, flags); | |
5122 | } | |
5123 | ||
5124 | static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = { | |
5125 | .func = bpf_sk_lookup_tcp, | |
5126 | .gpl_only = false, | |
5127 | .pkt_access = true, | |
5128 | .ret_type = RET_PTR_TO_SOCKET_OR_NULL, | |
5129 | .arg1_type = ARG_PTR_TO_CTX, | |
5130 | .arg2_type = ARG_PTR_TO_MEM, | |
5131 | .arg3_type = ARG_CONST_SIZE, | |
5132 | .arg4_type = ARG_ANYTHING, | |
5133 | .arg5_type = ARG_ANYTHING, | |
5134 | }; | |
5135 | ||
5136 | BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb, | |
5137 | struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) | |
5138 | { | |
5139 | return bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, netns_id, flags); | |
5140 | } | |
5141 | ||
5142 | static const struct bpf_func_proto bpf_sk_lookup_udp_proto = { | |
5143 | .func = bpf_sk_lookup_udp, | |
5144 | .gpl_only = false, | |
5145 | .pkt_access = true, | |
5146 | .ret_type = RET_PTR_TO_SOCKET_OR_NULL, | |
5147 | .arg1_type = ARG_PTR_TO_CTX, | |
5148 | .arg2_type = ARG_PTR_TO_MEM, | |
5149 | .arg3_type = ARG_CONST_SIZE, | |
5150 | .arg4_type = ARG_ANYTHING, | |
5151 | .arg5_type = ARG_ANYTHING, | |
5152 | }; | |
5153 | ||
5154 | BPF_CALL_1(bpf_sk_release, struct sock *, sk) | |
5155 | { | |
5156 | if (!sock_flag(sk, SOCK_RCU_FREE)) | |
5157 | sock_gen_put(sk); | |
5158 | return 0; | |
5159 | } | |
5160 | ||
5161 | static const struct bpf_func_proto bpf_sk_release_proto = { | |
5162 | .func = bpf_sk_release, | |
5163 | .gpl_only = false, | |
5164 | .ret_type = RET_INTEGER, | |
5165 | .arg1_type = ARG_PTR_TO_SOCKET, | |
5166 | }; | |
c8123ead NH |
5167 | |
5168 | BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx, | |
5169 | struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) | |
5170 | { | |
5171 | struct net *caller_net = dev_net(ctx->rxq->dev); | |
5172 | int ifindex = ctx->rxq->dev->ifindex; | |
5173 | ||
5174 | return __bpf_sk_lookup(NULL, tuple, len, caller_net, ifindex, | |
5175 | IPPROTO_UDP, netns_id, flags); | |
5176 | } | |
5177 | ||
5178 | static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = { | |
5179 | .func = bpf_xdp_sk_lookup_udp, | |
5180 | .gpl_only = false, | |
5181 | .pkt_access = true, | |
5182 | .ret_type = RET_PTR_TO_SOCKET_OR_NULL, | |
5183 | .arg1_type = ARG_PTR_TO_CTX, | |
5184 | .arg2_type = ARG_PTR_TO_MEM, | |
5185 | .arg3_type = ARG_CONST_SIZE, | |
5186 | .arg4_type = ARG_ANYTHING, | |
5187 | .arg5_type = ARG_ANYTHING, | |
5188 | }; | |
5189 | ||
5190 | BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx, | |
5191 | struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) | |
5192 | { | |
5193 | struct net *caller_net = dev_net(ctx->rxq->dev); | |
5194 | int ifindex = ctx->rxq->dev->ifindex; | |
5195 | ||
5196 | return __bpf_sk_lookup(NULL, tuple, len, caller_net, ifindex, | |
5197 | IPPROTO_TCP, netns_id, flags); | |
5198 | } | |
5199 | ||
5200 | static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = { | |
5201 | .func = bpf_xdp_sk_lookup_tcp, | |
5202 | .gpl_only = false, | |
5203 | .pkt_access = true, | |
5204 | .ret_type = RET_PTR_TO_SOCKET_OR_NULL, | |
5205 | .arg1_type = ARG_PTR_TO_CTX, | |
5206 | .arg2_type = ARG_PTR_TO_MEM, | |
5207 | .arg3_type = ARG_CONST_SIZE, | |
5208 | .arg4_type = ARG_ANYTHING, | |
5209 | .arg5_type = ARG_ANYTHING, | |
5210 | }; | |
6c49e65e AI |
5211 | |
5212 | BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx, | |
5213 | struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) | |
5214 | { | |
5215 | return __bpf_sk_lookup(NULL, tuple, len, sock_net(ctx->sk), 0, | |
5216 | IPPROTO_TCP, netns_id, flags); | |
5217 | } | |
5218 | ||
5219 | static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = { | |
5220 | .func = bpf_sock_addr_sk_lookup_tcp, | |
5221 | .gpl_only = false, | |
5222 | .ret_type = RET_PTR_TO_SOCKET_OR_NULL, | |
5223 | .arg1_type = ARG_PTR_TO_CTX, | |
5224 | .arg2_type = ARG_PTR_TO_MEM, | |
5225 | .arg3_type = ARG_CONST_SIZE, | |
5226 | .arg4_type = ARG_ANYTHING, | |
5227 | .arg5_type = ARG_ANYTHING, | |
5228 | }; | |
5229 | ||
5230 | BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx, | |
5231 | struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) | |
5232 | { | |
5233 | return __bpf_sk_lookup(NULL, tuple, len, sock_net(ctx->sk), 0, | |
5234 | IPPROTO_UDP, netns_id, flags); | |
5235 | } | |
5236 | ||
5237 | static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = { | |
5238 | .func = bpf_sock_addr_sk_lookup_udp, | |
5239 | .gpl_only = false, | |
5240 | .ret_type = RET_PTR_TO_SOCKET_OR_NULL, | |
5241 | .arg1_type = ARG_PTR_TO_CTX, | |
5242 | .arg2_type = ARG_PTR_TO_MEM, | |
5243 | .arg3_type = ARG_CONST_SIZE, | |
5244 | .arg4_type = ARG_ANYTHING, | |
5245 | .arg5_type = ARG_ANYTHING, | |
5246 | }; | |
5247 | ||
df3f94a0 | 5248 | #endif /* CONFIG_INET */ |
6acc9b43 | 5249 | |
fe94cc29 MX |
5250 | bool bpf_helper_changes_pkt_data(void *func) |
5251 | { | |
5252 | if (func == bpf_skb_vlan_push || | |
5253 | func == bpf_skb_vlan_pop || | |
5254 | func == bpf_skb_store_bytes || | |
5255 | func == bpf_skb_change_proto || | |
5256 | func == bpf_skb_change_head || | |
0ea488ff | 5257 | func == sk_skb_change_head || |
fe94cc29 | 5258 | func == bpf_skb_change_tail || |
0ea488ff | 5259 | func == sk_skb_change_tail || |
fe94cc29 MX |
5260 | func == bpf_skb_adjust_room || |
5261 | func == bpf_skb_pull_data || | |
0ea488ff | 5262 | func == sk_skb_pull_data || |
fe94cc29 MX |
5263 | func == bpf_clone_redirect || |
5264 | func == bpf_l3_csum_replace || | |
5265 | func == bpf_l4_csum_replace || | |
5266 | func == bpf_xdp_adjust_head || | |
5267 | func == bpf_xdp_adjust_meta || | |
5268 | func == bpf_msg_pull_data || | |
6fff607e | 5269 | func == bpf_msg_push_data || |
7246d8ed | 5270 | func == bpf_msg_pop_data || |
fe94cc29 | 5271 | func == bpf_xdp_adjust_tail || |
61d76980 | 5272 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
fe94cc29 MX |
5273 | func == bpf_lwt_seg6_store_bytes || |
5274 | func == bpf_lwt_seg6_adjust_srh || | |
61d76980 MX |
5275 | func == bpf_lwt_seg6_action || |
5276 | #endif | |
5277 | func == bpf_lwt_push_encap) | |
fe94cc29 MX |
5278 | return true; |
5279 | ||
5280 | return false; | |
5281 | } | |
5282 | ||
d4052c4a | 5283 | static const struct bpf_func_proto * |
2492d3b8 | 5284 | bpf_base_func_proto(enum bpf_func_id func_id) |
89aa0758 AS |
5285 | { |
5286 | switch (func_id) { | |
5287 | case BPF_FUNC_map_lookup_elem: | |
5288 | return &bpf_map_lookup_elem_proto; | |
5289 | case BPF_FUNC_map_update_elem: | |
5290 | return &bpf_map_update_elem_proto; | |
5291 | case BPF_FUNC_map_delete_elem: | |
5292 | return &bpf_map_delete_elem_proto; | |
f1a2e44a MV |
5293 | case BPF_FUNC_map_push_elem: |
5294 | return &bpf_map_push_elem_proto; | |
5295 | case BPF_FUNC_map_pop_elem: | |
5296 | return &bpf_map_pop_elem_proto; | |
5297 | case BPF_FUNC_map_peek_elem: | |
5298 | return &bpf_map_peek_elem_proto; | |
03e69b50 DB |
5299 | case BPF_FUNC_get_prandom_u32: |
5300 | return &bpf_get_prandom_u32_proto; | |
c04167ce | 5301 | case BPF_FUNC_get_smp_processor_id: |
80b48c44 | 5302 | return &bpf_get_raw_smp_processor_id_proto; |
2d0e30c3 DB |
5303 | case BPF_FUNC_get_numa_node_id: |
5304 | return &bpf_get_numa_node_id_proto; | |
04fd61ab AS |
5305 | case BPF_FUNC_tail_call: |
5306 | return &bpf_tail_call_proto; | |
17ca8cbf DB |
5307 | case BPF_FUNC_ktime_get_ns: |
5308 | return &bpf_ktime_get_ns_proto; | |
0756ea3e | 5309 | case BPF_FUNC_trace_printk: |
1be7f75d AS |
5310 | if (capable(CAP_SYS_ADMIN)) |
5311 | return bpf_get_trace_printk_proto(); | |
2cc0608e | 5312 | /* else: fall through */ |
89aa0758 AS |
5313 | default: |
5314 | return NULL; | |
5315 | } | |
5316 | } | |
5317 | ||
ae2cf1c4 | 5318 | static const struct bpf_func_proto * |
5e43f899 | 5319 | sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
ae2cf1c4 DA |
5320 | { |
5321 | switch (func_id) { | |
5322 | /* inet and inet6 sockets are created in a process | |
5323 | * context so there is always a valid uid/gid | |
5324 | */ | |
5325 | case BPF_FUNC_get_current_uid_gid: | |
5326 | return &bpf_get_current_uid_gid_proto; | |
cd339431 RG |
5327 | case BPF_FUNC_get_local_storage: |
5328 | return &bpf_get_local_storage_proto; | |
ae2cf1c4 DA |
5329 | default: |
5330 | return bpf_base_func_proto(func_id); | |
5331 | } | |
5332 | } | |
5333 | ||
4fbac77d AI |
5334 | static const struct bpf_func_proto * |
5335 | sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
5336 | { | |
5337 | switch (func_id) { | |
5338 | /* inet and inet6 sockets are created in a process | |
5339 | * context so there is always a valid uid/gid | |
5340 | */ | |
5341 | case BPF_FUNC_get_current_uid_gid: | |
5342 | return &bpf_get_current_uid_gid_proto; | |
d74bad4e AI |
5343 | case BPF_FUNC_bind: |
5344 | switch (prog->expected_attach_type) { | |
5345 | case BPF_CGROUP_INET4_CONNECT: | |
5346 | case BPF_CGROUP_INET6_CONNECT: | |
5347 | return &bpf_bind_proto; | |
5348 | default: | |
5349 | return NULL; | |
5350 | } | |
d692f113 AI |
5351 | case BPF_FUNC_get_socket_cookie: |
5352 | return &bpf_get_socket_cookie_sock_addr_proto; | |
cd339431 RG |
5353 | case BPF_FUNC_get_local_storage: |
5354 | return &bpf_get_local_storage_proto; | |
6c49e65e AI |
5355 | #ifdef CONFIG_INET |
5356 | case BPF_FUNC_sk_lookup_tcp: | |
5357 | return &bpf_sock_addr_sk_lookup_tcp_proto; | |
5358 | case BPF_FUNC_sk_lookup_udp: | |
5359 | return &bpf_sock_addr_sk_lookup_udp_proto; | |
5360 | case BPF_FUNC_sk_release: | |
5361 | return &bpf_sk_release_proto; | |
5362 | #endif /* CONFIG_INET */ | |
4fbac77d AI |
5363 | default: |
5364 | return bpf_base_func_proto(func_id); | |
5365 | } | |
5366 | } | |
5367 | ||
2492d3b8 | 5368 | static const struct bpf_func_proto * |
5e43f899 | 5369 | sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
2492d3b8 DB |
5370 | { |
5371 | switch (func_id) { | |
5372 | case BPF_FUNC_skb_load_bytes: | |
5373 | return &bpf_skb_load_bytes_proto; | |
4e1ec56c DB |
5374 | case BPF_FUNC_skb_load_bytes_relative: |
5375 | return &bpf_skb_load_bytes_relative_proto; | |
91b8270f CF |
5376 | case BPF_FUNC_get_socket_cookie: |
5377 | return &bpf_get_socket_cookie_proto; | |
6acc5c29 CF |
5378 | case BPF_FUNC_get_socket_uid: |
5379 | return &bpf_get_socket_uid_proto; | |
2492d3b8 DB |
5380 | default: |
5381 | return bpf_base_func_proto(func_id); | |
5382 | } | |
5383 | } | |
5384 | ||
cd339431 RG |
5385 | static const struct bpf_func_proto * |
5386 | cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
5387 | { | |
5388 | switch (func_id) { | |
5389 | case BPF_FUNC_get_local_storage: | |
5390 | return &bpf_get_local_storage_proto; | |
5391 | default: | |
5392 | return sk_filter_func_proto(func_id, prog); | |
5393 | } | |
5394 | } | |
5395 | ||
608cd71a | 5396 | static const struct bpf_func_proto * |
5e43f899 | 5397 | tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
608cd71a AS |
5398 | { |
5399 | switch (func_id) { | |
5400 | case BPF_FUNC_skb_store_bytes: | |
5401 | return &bpf_skb_store_bytes_proto; | |
05c74e5e DB |
5402 | case BPF_FUNC_skb_load_bytes: |
5403 | return &bpf_skb_load_bytes_proto; | |
4e1ec56c DB |
5404 | case BPF_FUNC_skb_load_bytes_relative: |
5405 | return &bpf_skb_load_bytes_relative_proto; | |
36bbef52 DB |
5406 | case BPF_FUNC_skb_pull_data: |
5407 | return &bpf_skb_pull_data_proto; | |
7d672345 DB |
5408 | case BPF_FUNC_csum_diff: |
5409 | return &bpf_csum_diff_proto; | |
36bbef52 DB |
5410 | case BPF_FUNC_csum_update: |
5411 | return &bpf_csum_update_proto; | |
91bc4822 AS |
5412 | case BPF_FUNC_l3_csum_replace: |
5413 | return &bpf_l3_csum_replace_proto; | |
5414 | case BPF_FUNC_l4_csum_replace: | |
5415 | return &bpf_l4_csum_replace_proto; | |
3896d655 AS |
5416 | case BPF_FUNC_clone_redirect: |
5417 | return &bpf_clone_redirect_proto; | |
8d20aabe DB |
5418 | case BPF_FUNC_get_cgroup_classid: |
5419 | return &bpf_get_cgroup_classid_proto; | |
4e10df9a AS |
5420 | case BPF_FUNC_skb_vlan_push: |
5421 | return &bpf_skb_vlan_push_proto; | |
5422 | case BPF_FUNC_skb_vlan_pop: | |
5423 | return &bpf_skb_vlan_pop_proto; | |
6578171a DB |
5424 | case BPF_FUNC_skb_change_proto: |
5425 | return &bpf_skb_change_proto_proto; | |
d2485c42 DB |
5426 | case BPF_FUNC_skb_change_type: |
5427 | return &bpf_skb_change_type_proto; | |
2be7e212 DB |
5428 | case BPF_FUNC_skb_adjust_room: |
5429 | return &bpf_skb_adjust_room_proto; | |
5293efe6 DB |
5430 | case BPF_FUNC_skb_change_tail: |
5431 | return &bpf_skb_change_tail_proto; | |
d3aa45ce AS |
5432 | case BPF_FUNC_skb_get_tunnel_key: |
5433 | return &bpf_skb_get_tunnel_key_proto; | |
5434 | case BPF_FUNC_skb_set_tunnel_key: | |
14ca0751 DB |
5435 | return bpf_get_skb_set_tunnel_proto(func_id); |
5436 | case BPF_FUNC_skb_get_tunnel_opt: | |
5437 | return &bpf_skb_get_tunnel_opt_proto; | |
5438 | case BPF_FUNC_skb_set_tunnel_opt: | |
5439 | return bpf_get_skb_set_tunnel_proto(func_id); | |
27b29f63 AS |
5440 | case BPF_FUNC_redirect: |
5441 | return &bpf_redirect_proto; | |
c46646d0 DB |
5442 | case BPF_FUNC_get_route_realm: |
5443 | return &bpf_get_route_realm_proto; | |
13c5c240 DB |
5444 | case BPF_FUNC_get_hash_recalc: |
5445 | return &bpf_get_hash_recalc_proto; | |
7a4b28c6 DB |
5446 | case BPF_FUNC_set_hash_invalid: |
5447 | return &bpf_set_hash_invalid_proto; | |
ded092cd DB |
5448 | case BPF_FUNC_set_hash: |
5449 | return &bpf_set_hash_proto; | |
bd570ff9 | 5450 | case BPF_FUNC_perf_event_output: |
555c8a86 | 5451 | return &bpf_skb_event_output_proto; |
80b48c44 DB |
5452 | case BPF_FUNC_get_smp_processor_id: |
5453 | return &bpf_get_smp_processor_id_proto; | |
747ea55e DB |
5454 | case BPF_FUNC_skb_under_cgroup: |
5455 | return &bpf_skb_under_cgroup_proto; | |
91b8270f CF |
5456 | case BPF_FUNC_get_socket_cookie: |
5457 | return &bpf_get_socket_cookie_proto; | |
6acc5c29 CF |
5458 | case BPF_FUNC_get_socket_uid: |
5459 | return &bpf_get_socket_uid_proto; | |
cb20b08e DB |
5460 | case BPF_FUNC_fib_lookup: |
5461 | return &bpf_skb_fib_lookup_proto; | |
12bed760 EB |
5462 | #ifdef CONFIG_XFRM |
5463 | case BPF_FUNC_skb_get_xfrm_state: | |
5464 | return &bpf_skb_get_xfrm_state_proto; | |
5465 | #endif | |
cb20b08e DB |
5466 | #ifdef CONFIG_SOCK_CGROUP_DATA |
5467 | case BPF_FUNC_skb_cgroup_id: | |
5468 | return &bpf_skb_cgroup_id_proto; | |
77236281 AI |
5469 | case BPF_FUNC_skb_ancestor_cgroup_id: |
5470 | return &bpf_skb_ancestor_cgroup_id_proto; | |
cb20b08e | 5471 | #endif |
df3f94a0 | 5472 | #ifdef CONFIG_INET |
6acc9b43 JS |
5473 | case BPF_FUNC_sk_lookup_tcp: |
5474 | return &bpf_sk_lookup_tcp_proto; | |
5475 | case BPF_FUNC_sk_lookup_udp: | |
5476 | return &bpf_sk_lookup_udp_proto; | |
5477 | case BPF_FUNC_sk_release: | |
5478 | return &bpf_sk_release_proto; | |
df3f94a0 | 5479 | #endif |
608cd71a | 5480 | default: |
2492d3b8 | 5481 | return bpf_base_func_proto(func_id); |
608cd71a AS |
5482 | } |
5483 | } | |
5484 | ||
6a773a15 | 5485 | static const struct bpf_func_proto * |
5e43f899 | 5486 | xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
6a773a15 | 5487 | { |
4de16969 DB |
5488 | switch (func_id) { |
5489 | case BPF_FUNC_perf_event_output: | |
5490 | return &bpf_xdp_event_output_proto; | |
669dc4d7 DB |
5491 | case BPF_FUNC_get_smp_processor_id: |
5492 | return &bpf_get_smp_processor_id_proto; | |
205c3807 DB |
5493 | case BPF_FUNC_csum_diff: |
5494 | return &bpf_csum_diff_proto; | |
17bedab2 MKL |
5495 | case BPF_FUNC_xdp_adjust_head: |
5496 | return &bpf_xdp_adjust_head_proto; | |
de8f3a83 DB |
5497 | case BPF_FUNC_xdp_adjust_meta: |
5498 | return &bpf_xdp_adjust_meta_proto; | |
814abfab JF |
5499 | case BPF_FUNC_redirect: |
5500 | return &bpf_xdp_redirect_proto; | |
97f91a7c | 5501 | case BPF_FUNC_redirect_map: |
e4a8e817 | 5502 | return &bpf_xdp_redirect_map_proto; |
b32cc5b9 NS |
5503 | case BPF_FUNC_xdp_adjust_tail: |
5504 | return &bpf_xdp_adjust_tail_proto; | |
87f5fc7e DA |
5505 | case BPF_FUNC_fib_lookup: |
5506 | return &bpf_xdp_fib_lookup_proto; | |
c8123ead NH |
5507 | #ifdef CONFIG_INET |
5508 | case BPF_FUNC_sk_lookup_udp: | |
5509 | return &bpf_xdp_sk_lookup_udp_proto; | |
5510 | case BPF_FUNC_sk_lookup_tcp: | |
5511 | return &bpf_xdp_sk_lookup_tcp_proto; | |
5512 | case BPF_FUNC_sk_release: | |
5513 | return &bpf_sk_release_proto; | |
5514 | #endif | |
4de16969 | 5515 | default: |
2492d3b8 | 5516 | return bpf_base_func_proto(func_id); |
4de16969 | 5517 | } |
6a773a15 BB |
5518 | } |
5519 | ||
604326b4 DB |
5520 | const struct bpf_func_proto bpf_sock_map_update_proto __weak; |
5521 | const struct bpf_func_proto bpf_sock_hash_update_proto __weak; | |
5522 | ||
8c4b4c7e | 5523 | static const struct bpf_func_proto * |
5e43f899 | 5524 | sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
8c4b4c7e LB |
5525 | { |
5526 | switch (func_id) { | |
5527 | case BPF_FUNC_setsockopt: | |
5528 | return &bpf_setsockopt_proto; | |
cd86d1fd LB |
5529 | case BPF_FUNC_getsockopt: |
5530 | return &bpf_getsockopt_proto; | |
b13d8807 LB |
5531 | case BPF_FUNC_sock_ops_cb_flags_set: |
5532 | return &bpf_sock_ops_cb_flags_set_proto; | |
174a79ff JF |
5533 | case BPF_FUNC_sock_map_update: |
5534 | return &bpf_sock_map_update_proto; | |
81110384 JF |
5535 | case BPF_FUNC_sock_hash_update: |
5536 | return &bpf_sock_hash_update_proto; | |
d692f113 AI |
5537 | case BPF_FUNC_get_socket_cookie: |
5538 | return &bpf_get_socket_cookie_sock_ops_proto; | |
cd339431 RG |
5539 | case BPF_FUNC_get_local_storage: |
5540 | return &bpf_get_local_storage_proto; | |
a5a3a828 SV |
5541 | case BPF_FUNC_perf_event_output: |
5542 | return &bpf_sockopt_event_output_proto; | |
8c4b4c7e LB |
5543 | default: |
5544 | return bpf_base_func_proto(func_id); | |
5545 | } | |
5546 | } | |
5547 | ||
604326b4 DB |
5548 | const struct bpf_func_proto bpf_msg_redirect_map_proto __weak; |
5549 | const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak; | |
5550 | ||
5e43f899 AI |
5551 | static const struct bpf_func_proto * |
5552 | sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
4f738adb JF |
5553 | { |
5554 | switch (func_id) { | |
5555 | case BPF_FUNC_msg_redirect_map: | |
5556 | return &bpf_msg_redirect_map_proto; | |
81110384 JF |
5557 | case BPF_FUNC_msg_redirect_hash: |
5558 | return &bpf_msg_redirect_hash_proto; | |
2a100317 JF |
5559 | case BPF_FUNC_msg_apply_bytes: |
5560 | return &bpf_msg_apply_bytes_proto; | |
91843d54 JF |
5561 | case BPF_FUNC_msg_cork_bytes: |
5562 | return &bpf_msg_cork_bytes_proto; | |
015632bb JF |
5563 | case BPF_FUNC_msg_pull_data: |
5564 | return &bpf_msg_pull_data_proto; | |
6fff607e JF |
5565 | case BPF_FUNC_msg_push_data: |
5566 | return &bpf_msg_push_data_proto; | |
7246d8ed JF |
5567 | case BPF_FUNC_msg_pop_data: |
5568 | return &bpf_msg_pop_data_proto; | |
4f738adb JF |
5569 | default: |
5570 | return bpf_base_func_proto(func_id); | |
5571 | } | |
5572 | } | |
5573 | ||
604326b4 DB |
5574 | const struct bpf_func_proto bpf_sk_redirect_map_proto __weak; |
5575 | const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak; | |
5576 | ||
5e43f899 AI |
5577 | static const struct bpf_func_proto * |
5578 | sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
b005fd18 JF |
5579 | { |
5580 | switch (func_id) { | |
8a31db56 JF |
5581 | case BPF_FUNC_skb_store_bytes: |
5582 | return &bpf_skb_store_bytes_proto; | |
b005fd18 JF |
5583 | case BPF_FUNC_skb_load_bytes: |
5584 | return &bpf_skb_load_bytes_proto; | |
8a31db56 | 5585 | case BPF_FUNC_skb_pull_data: |
0ea488ff | 5586 | return &sk_skb_pull_data_proto; |
8a31db56 | 5587 | case BPF_FUNC_skb_change_tail: |
0ea488ff | 5588 | return &sk_skb_change_tail_proto; |
8a31db56 | 5589 | case BPF_FUNC_skb_change_head: |
0ea488ff | 5590 | return &sk_skb_change_head_proto; |
b005fd18 JF |
5591 | case BPF_FUNC_get_socket_cookie: |
5592 | return &bpf_get_socket_cookie_proto; | |
5593 | case BPF_FUNC_get_socket_uid: | |
5594 | return &bpf_get_socket_uid_proto; | |
174a79ff JF |
5595 | case BPF_FUNC_sk_redirect_map: |
5596 | return &bpf_sk_redirect_map_proto; | |
81110384 JF |
5597 | case BPF_FUNC_sk_redirect_hash: |
5598 | return &bpf_sk_redirect_hash_proto; | |
df3f94a0 | 5599 | #ifdef CONFIG_INET |
6acc9b43 JS |
5600 | case BPF_FUNC_sk_lookup_tcp: |
5601 | return &bpf_sk_lookup_tcp_proto; | |
5602 | case BPF_FUNC_sk_lookup_udp: | |
5603 | return &bpf_sk_lookup_udp_proto; | |
5604 | case BPF_FUNC_sk_release: | |
5605 | return &bpf_sk_release_proto; | |
df3f94a0 | 5606 | #endif |
b005fd18 JF |
5607 | default: |
5608 | return bpf_base_func_proto(func_id); | |
5609 | } | |
5610 | } | |
5611 | ||
d58e468b PP |
5612 | static const struct bpf_func_proto * |
5613 | flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
5614 | { | |
5615 | switch (func_id) { | |
5616 | case BPF_FUNC_skb_load_bytes: | |
5617 | return &bpf_skb_load_bytes_proto; | |
5618 | default: | |
5619 | return bpf_base_func_proto(func_id); | |
5620 | } | |
5621 | } | |
5622 | ||
cd3092c7 MX |
5623 | static const struct bpf_func_proto * |
5624 | lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
5625 | { | |
5626 | switch (func_id) { | |
5627 | case BPF_FUNC_skb_load_bytes: | |
5628 | return &bpf_skb_load_bytes_proto; | |
5629 | case BPF_FUNC_skb_pull_data: | |
5630 | return &bpf_skb_pull_data_proto; | |
5631 | case BPF_FUNC_csum_diff: | |
5632 | return &bpf_csum_diff_proto; | |
5633 | case BPF_FUNC_get_cgroup_classid: | |
5634 | return &bpf_get_cgroup_classid_proto; | |
5635 | case BPF_FUNC_get_route_realm: | |
5636 | return &bpf_get_route_realm_proto; | |
5637 | case BPF_FUNC_get_hash_recalc: | |
5638 | return &bpf_get_hash_recalc_proto; | |
5639 | case BPF_FUNC_perf_event_output: | |
5640 | return &bpf_skb_event_output_proto; | |
5641 | case BPF_FUNC_get_smp_processor_id: | |
5642 | return &bpf_get_smp_processor_id_proto; | |
5643 | case BPF_FUNC_skb_under_cgroup: | |
5644 | return &bpf_skb_under_cgroup_proto; | |
5645 | default: | |
5646 | return bpf_base_func_proto(func_id); | |
5647 | } | |
5648 | } | |
5649 | ||
5650 | static const struct bpf_func_proto * | |
5651 | lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
5652 | { | |
5653 | switch (func_id) { | |
5654 | case BPF_FUNC_lwt_push_encap: | |
5655 | return &bpf_lwt_push_encap_proto; | |
5656 | default: | |
5657 | return lwt_out_func_proto(func_id, prog); | |
5658 | } | |
5659 | } | |
5660 | ||
3a0af8fd | 5661 | static const struct bpf_func_proto * |
5e43f899 | 5662 | lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
3a0af8fd TG |
5663 | { |
5664 | switch (func_id) { | |
5665 | case BPF_FUNC_skb_get_tunnel_key: | |
5666 | return &bpf_skb_get_tunnel_key_proto; | |
5667 | case BPF_FUNC_skb_set_tunnel_key: | |
5668 | return bpf_get_skb_set_tunnel_proto(func_id); | |
5669 | case BPF_FUNC_skb_get_tunnel_opt: | |
5670 | return &bpf_skb_get_tunnel_opt_proto; | |
5671 | case BPF_FUNC_skb_set_tunnel_opt: | |
5672 | return bpf_get_skb_set_tunnel_proto(func_id); | |
5673 | case BPF_FUNC_redirect: | |
5674 | return &bpf_redirect_proto; | |
5675 | case BPF_FUNC_clone_redirect: | |
5676 | return &bpf_clone_redirect_proto; | |
5677 | case BPF_FUNC_skb_change_tail: | |
5678 | return &bpf_skb_change_tail_proto; | |
5679 | case BPF_FUNC_skb_change_head: | |
5680 | return &bpf_skb_change_head_proto; | |
5681 | case BPF_FUNC_skb_store_bytes: | |
5682 | return &bpf_skb_store_bytes_proto; | |
5683 | case BPF_FUNC_csum_update: | |
5684 | return &bpf_csum_update_proto; | |
5685 | case BPF_FUNC_l3_csum_replace: | |
5686 | return &bpf_l3_csum_replace_proto; | |
5687 | case BPF_FUNC_l4_csum_replace: | |
5688 | return &bpf_l4_csum_replace_proto; | |
5689 | case BPF_FUNC_set_hash_invalid: | |
5690 | return &bpf_set_hash_invalid_proto; | |
5691 | default: | |
cd3092c7 | 5692 | return lwt_out_func_proto(func_id, prog); |
3a0af8fd TG |
5693 | } |
5694 | } | |
5695 | ||
004d4b27 MX |
5696 | static const struct bpf_func_proto * |
5697 | lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
5698 | { | |
5699 | switch (func_id) { | |
61d76980 | 5700 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
004d4b27 MX |
5701 | case BPF_FUNC_lwt_seg6_store_bytes: |
5702 | return &bpf_lwt_seg6_store_bytes_proto; | |
5703 | case BPF_FUNC_lwt_seg6_action: | |
5704 | return &bpf_lwt_seg6_action_proto; | |
5705 | case BPF_FUNC_lwt_seg6_adjust_srh: | |
5706 | return &bpf_lwt_seg6_adjust_srh_proto; | |
61d76980 | 5707 | #endif |
004d4b27 MX |
5708 | default: |
5709 | return lwt_out_func_proto(func_id, prog); | |
3a0af8fd TG |
5710 | } |
5711 | } | |
5712 | ||
f96da094 | 5713 | static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, |
5e43f899 | 5714 | const struct bpf_prog *prog, |
f96da094 | 5715 | struct bpf_insn_access_aux *info) |
23994631 | 5716 | { |
f96da094 | 5717 | const int size_default = sizeof(__u32); |
23994631 | 5718 | |
9bac3d6d AS |
5719 | if (off < 0 || off >= sizeof(struct __sk_buff)) |
5720 | return false; | |
62c7989b | 5721 | |
4936e352 | 5722 | /* The verifier guarantees that size > 0. */ |
9bac3d6d AS |
5723 | if (off % size != 0) |
5724 | return false; | |
62c7989b DB |
5725 | |
5726 | switch (off) { | |
f96da094 DB |
5727 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
5728 | if (off + size > offsetofend(struct __sk_buff, cb[4])) | |
62c7989b DB |
5729 | return false; |
5730 | break; | |
8a31db56 JF |
5731 | case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]): |
5732 | case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]): | |
5733 | case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4): | |
5734 | case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4): | |
f96da094 | 5735 | case bpf_ctx_range(struct __sk_buff, data): |
de8f3a83 | 5736 | case bpf_ctx_range(struct __sk_buff, data_meta): |
f96da094 DB |
5737 | case bpf_ctx_range(struct __sk_buff, data_end): |
5738 | if (size != size_default) | |
23994631 | 5739 | return false; |
31fd8581 | 5740 | break; |
b7df9ada DB |
5741 | case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): |
5742 | if (size != sizeof(__u64)) | |
d58e468b PP |
5743 | return false; |
5744 | break; | |
f11216b2 VD |
5745 | case bpf_ctx_range(struct __sk_buff, tstamp): |
5746 | if (size != sizeof(__u64)) | |
5747 | return false; | |
5748 | break; | |
31fd8581 | 5749 | default: |
f96da094 | 5750 | /* Only narrow read access allowed for now. */ |
31fd8581 | 5751 | if (type == BPF_WRITE) { |
f96da094 | 5752 | if (size != size_default) |
31fd8581 YS |
5753 | return false; |
5754 | } else { | |
f96da094 DB |
5755 | bpf_ctx_record_field_size(info, size_default); |
5756 | if (!bpf_ctx_narrow_access_ok(off, size, size_default)) | |
23994631 | 5757 | return false; |
31fd8581 | 5758 | } |
62c7989b | 5759 | } |
9bac3d6d AS |
5760 | |
5761 | return true; | |
5762 | } | |
5763 | ||
d691f9e8 | 5764 | static bool sk_filter_is_valid_access(int off, int size, |
19de99f7 | 5765 | enum bpf_access_type type, |
5e43f899 | 5766 | const struct bpf_prog *prog, |
23994631 | 5767 | struct bpf_insn_access_aux *info) |
d691f9e8 | 5768 | { |
db58ba45 | 5769 | switch (off) { |
f96da094 DB |
5770 | case bpf_ctx_range(struct __sk_buff, tc_classid): |
5771 | case bpf_ctx_range(struct __sk_buff, data): | |
de8f3a83 | 5772 | case bpf_ctx_range(struct __sk_buff, data_meta): |
f96da094 | 5773 | case bpf_ctx_range(struct __sk_buff, data_end): |
b7df9ada | 5774 | case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): |
8a31db56 | 5775 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
f11216b2 | 5776 | case bpf_ctx_range(struct __sk_buff, tstamp): |
e3da08d0 | 5777 | case bpf_ctx_range(struct __sk_buff, wire_len): |
045efa82 | 5778 | return false; |
db58ba45 | 5779 | } |
045efa82 | 5780 | |
d691f9e8 AS |
5781 | if (type == BPF_WRITE) { |
5782 | switch (off) { | |
f96da094 | 5783 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
d691f9e8 AS |
5784 | break; |
5785 | default: | |
5786 | return false; | |
5787 | } | |
5788 | } | |
5789 | ||
5e43f899 | 5790 | return bpf_skb_is_valid_access(off, size, type, prog, info); |
d691f9e8 AS |
5791 | } |
5792 | ||
b39b5f41 SL |
5793 | static bool cg_skb_is_valid_access(int off, int size, |
5794 | enum bpf_access_type type, | |
5795 | const struct bpf_prog *prog, | |
5796 | struct bpf_insn_access_aux *info) | |
5797 | { | |
5798 | switch (off) { | |
5799 | case bpf_ctx_range(struct __sk_buff, tc_classid): | |
5800 | case bpf_ctx_range(struct __sk_buff, data_meta): | |
b7df9ada | 5801 | case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): |
e3da08d0 | 5802 | case bpf_ctx_range(struct __sk_buff, wire_len): |
b39b5f41 | 5803 | return false; |
ab21c1b5 DB |
5804 | case bpf_ctx_range(struct __sk_buff, data): |
5805 | case bpf_ctx_range(struct __sk_buff, data_end): | |
5806 | if (!capable(CAP_SYS_ADMIN)) | |
5807 | return false; | |
5808 | break; | |
b39b5f41 | 5809 | } |
ab21c1b5 | 5810 | |
b39b5f41 SL |
5811 | if (type == BPF_WRITE) { |
5812 | switch (off) { | |
5813 | case bpf_ctx_range(struct __sk_buff, mark): | |
5814 | case bpf_ctx_range(struct __sk_buff, priority): | |
5815 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
5816 | break; | |
f11216b2 VD |
5817 | case bpf_ctx_range(struct __sk_buff, tstamp): |
5818 | if (!capable(CAP_SYS_ADMIN)) | |
5819 | return false; | |
5820 | break; | |
b39b5f41 SL |
5821 | default: |
5822 | return false; | |
5823 | } | |
5824 | } | |
5825 | ||
5826 | switch (off) { | |
5827 | case bpf_ctx_range(struct __sk_buff, data): | |
5828 | info->reg_type = PTR_TO_PACKET; | |
5829 | break; | |
5830 | case bpf_ctx_range(struct __sk_buff, data_end): | |
5831 | info->reg_type = PTR_TO_PACKET_END; | |
5832 | break; | |
5833 | } | |
5834 | ||
5835 | return bpf_skb_is_valid_access(off, size, type, prog, info); | |
5836 | } | |
5837 | ||
3a0af8fd TG |
5838 | static bool lwt_is_valid_access(int off, int size, |
5839 | enum bpf_access_type type, | |
5e43f899 | 5840 | const struct bpf_prog *prog, |
23994631 | 5841 | struct bpf_insn_access_aux *info) |
3a0af8fd TG |
5842 | { |
5843 | switch (off) { | |
f96da094 | 5844 | case bpf_ctx_range(struct __sk_buff, tc_classid): |
8a31db56 | 5845 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
de8f3a83 | 5846 | case bpf_ctx_range(struct __sk_buff, data_meta): |
b7df9ada | 5847 | case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): |
f11216b2 | 5848 | case bpf_ctx_range(struct __sk_buff, tstamp): |
e3da08d0 | 5849 | case bpf_ctx_range(struct __sk_buff, wire_len): |
3a0af8fd TG |
5850 | return false; |
5851 | } | |
5852 | ||
5853 | if (type == BPF_WRITE) { | |
5854 | switch (off) { | |
f96da094 DB |
5855 | case bpf_ctx_range(struct __sk_buff, mark): |
5856 | case bpf_ctx_range(struct __sk_buff, priority): | |
5857 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
3a0af8fd TG |
5858 | break; |
5859 | default: | |
5860 | return false; | |
5861 | } | |
5862 | } | |
5863 | ||
f96da094 DB |
5864 | switch (off) { |
5865 | case bpf_ctx_range(struct __sk_buff, data): | |
5866 | info->reg_type = PTR_TO_PACKET; | |
5867 | break; | |
5868 | case bpf_ctx_range(struct __sk_buff, data_end): | |
5869 | info->reg_type = PTR_TO_PACKET_END; | |
5870 | break; | |
5871 | } | |
5872 | ||
5e43f899 | 5873 | return bpf_skb_is_valid_access(off, size, type, prog, info); |
3a0af8fd TG |
5874 | } |
5875 | ||
aac3fc32 AI |
5876 | /* Attach type specific accesses */ |
5877 | static bool __sock_filter_check_attach_type(int off, | |
5878 | enum bpf_access_type access_type, | |
5879 | enum bpf_attach_type attach_type) | |
61023658 | 5880 | { |
aac3fc32 AI |
5881 | switch (off) { |
5882 | case offsetof(struct bpf_sock, bound_dev_if): | |
5883 | case offsetof(struct bpf_sock, mark): | |
5884 | case offsetof(struct bpf_sock, priority): | |
5885 | switch (attach_type) { | |
5886 | case BPF_CGROUP_INET_SOCK_CREATE: | |
5887 | goto full_access; | |
5888 | default: | |
5889 | return false; | |
5890 | } | |
5891 | case bpf_ctx_range(struct bpf_sock, src_ip4): | |
5892 | switch (attach_type) { | |
5893 | case BPF_CGROUP_INET4_POST_BIND: | |
5894 | goto read_only; | |
5895 | default: | |
5896 | return false; | |
5897 | } | |
5898 | case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): | |
5899 | switch (attach_type) { | |
5900 | case BPF_CGROUP_INET6_POST_BIND: | |
5901 | goto read_only; | |
5902 | default: | |
5903 | return false; | |
5904 | } | |
5905 | case bpf_ctx_range(struct bpf_sock, src_port): | |
5906 | switch (attach_type) { | |
5907 | case BPF_CGROUP_INET4_POST_BIND: | |
5908 | case BPF_CGROUP_INET6_POST_BIND: | |
5909 | goto read_only; | |
61023658 DA |
5910 | default: |
5911 | return false; | |
5912 | } | |
5913 | } | |
aac3fc32 AI |
5914 | read_only: |
5915 | return access_type == BPF_READ; | |
5916 | full_access: | |
5917 | return true; | |
5918 | } | |
5919 | ||
5920 | static bool __sock_filter_check_size(int off, int size, | |
5921 | struct bpf_insn_access_aux *info) | |
5922 | { | |
5923 | const int size_default = sizeof(__u32); | |
61023658 | 5924 | |
aac3fc32 AI |
5925 | switch (off) { |
5926 | case bpf_ctx_range(struct bpf_sock, src_ip4): | |
5927 | case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): | |
5928 | bpf_ctx_record_field_size(info, size_default); | |
5929 | return bpf_ctx_narrow_access_ok(off, size, size_default); | |
5930 | } | |
5931 | ||
5932 | return size == size_default; | |
5933 | } | |
5934 | ||
c64b7983 JS |
5935 | bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, |
5936 | struct bpf_insn_access_aux *info) | |
aac3fc32 AI |
5937 | { |
5938 | if (off < 0 || off >= sizeof(struct bpf_sock)) | |
61023658 | 5939 | return false; |
61023658 DA |
5940 | if (off % size != 0) |
5941 | return false; | |
aac3fc32 | 5942 | if (!__sock_filter_check_size(off, size, info)) |
61023658 | 5943 | return false; |
61023658 DA |
5944 | return true; |
5945 | } | |
5946 | ||
c64b7983 JS |
5947 | static bool sock_filter_is_valid_access(int off, int size, |
5948 | enum bpf_access_type type, | |
5949 | const struct bpf_prog *prog, | |
5950 | struct bpf_insn_access_aux *info) | |
5951 | { | |
5952 | if (!bpf_sock_is_valid_access(off, size, type, info)) | |
5953 | return false; | |
5954 | return __sock_filter_check_attach_type(off, type, | |
5955 | prog->expected_attach_type); | |
5956 | } | |
5957 | ||
b09928b9 DB |
5958 | static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write, |
5959 | const struct bpf_prog *prog) | |
5960 | { | |
5961 | /* Neither direct read nor direct write requires any preliminary | |
5962 | * action. | |
5963 | */ | |
5964 | return 0; | |
5965 | } | |
5966 | ||
047b0ecd DB |
5967 | static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, |
5968 | const struct bpf_prog *prog, int drop_verdict) | |
36bbef52 DB |
5969 | { |
5970 | struct bpf_insn *insn = insn_buf; | |
5971 | ||
5972 | if (!direct_write) | |
5973 | return 0; | |
5974 | ||
5975 | /* if (!skb->cloned) | |
5976 | * goto start; | |
5977 | * | |
5978 | * (Fast-path, otherwise approximation that we might be | |
5979 | * a clone, do the rest in helper.) | |
5980 | */ | |
5981 | *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET()); | |
5982 | *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); | |
5983 | *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); | |
5984 | ||
5985 | /* ret = bpf_skb_pull_data(skb, 0); */ | |
5986 | *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); | |
5987 | *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); | |
5988 | *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, | |
5989 | BPF_FUNC_skb_pull_data); | |
5990 | /* if (!ret) | |
5991 | * goto restore; | |
5992 | * return TC_ACT_SHOT; | |
5993 | */ | |
5994 | *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); | |
047b0ecd | 5995 | *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict); |
36bbef52 DB |
5996 | *insn++ = BPF_EXIT_INSN(); |
5997 | ||
5998 | /* restore: */ | |
5999 | *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); | |
6000 | /* start: */ | |
6001 | *insn++ = prog->insnsi[0]; | |
6002 | ||
6003 | return insn - insn_buf; | |
6004 | } | |
6005 | ||
e0cea7ce DB |
6006 | static int bpf_gen_ld_abs(const struct bpf_insn *orig, |
6007 | struct bpf_insn *insn_buf) | |
6008 | { | |
6009 | bool indirect = BPF_MODE(orig->code) == BPF_IND; | |
6010 | struct bpf_insn *insn = insn_buf; | |
6011 | ||
6012 | /* We're guaranteed here that CTX is in R6. */ | |
6013 | *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX); | |
6014 | if (!indirect) { | |
6015 | *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm); | |
6016 | } else { | |
6017 | *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg); | |
6018 | if (orig->imm) | |
6019 | *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm); | |
6020 | } | |
6021 | ||
6022 | switch (BPF_SIZE(orig->code)) { | |
6023 | case BPF_B: | |
6024 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache); | |
6025 | break; | |
6026 | case BPF_H: | |
6027 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache); | |
6028 | break; | |
6029 | case BPF_W: | |
6030 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache); | |
6031 | break; | |
6032 | } | |
6033 | ||
6034 | *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2); | |
6035 | *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0); | |
6036 | *insn++ = BPF_EXIT_INSN(); | |
6037 | ||
6038 | return insn - insn_buf; | |
6039 | } | |
6040 | ||
047b0ecd DB |
6041 | static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, |
6042 | const struct bpf_prog *prog) | |
6043 | { | |
6044 | return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT); | |
6045 | } | |
6046 | ||
d691f9e8 | 6047 | static bool tc_cls_act_is_valid_access(int off, int size, |
19de99f7 | 6048 | enum bpf_access_type type, |
5e43f899 | 6049 | const struct bpf_prog *prog, |
23994631 | 6050 | struct bpf_insn_access_aux *info) |
d691f9e8 AS |
6051 | { |
6052 | if (type == BPF_WRITE) { | |
6053 | switch (off) { | |
f96da094 DB |
6054 | case bpf_ctx_range(struct __sk_buff, mark): |
6055 | case bpf_ctx_range(struct __sk_buff, tc_index): | |
6056 | case bpf_ctx_range(struct __sk_buff, priority): | |
6057 | case bpf_ctx_range(struct __sk_buff, tc_classid): | |
6058 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
f11216b2 | 6059 | case bpf_ctx_range(struct __sk_buff, tstamp): |
d691f9e8 AS |
6060 | break; |
6061 | default: | |
6062 | return false; | |
6063 | } | |
6064 | } | |
19de99f7 | 6065 | |
f96da094 DB |
6066 | switch (off) { |
6067 | case bpf_ctx_range(struct __sk_buff, data): | |
6068 | info->reg_type = PTR_TO_PACKET; | |
6069 | break; | |
de8f3a83 DB |
6070 | case bpf_ctx_range(struct __sk_buff, data_meta): |
6071 | info->reg_type = PTR_TO_PACKET_META; | |
6072 | break; | |
f96da094 DB |
6073 | case bpf_ctx_range(struct __sk_buff, data_end): |
6074 | info->reg_type = PTR_TO_PACKET_END; | |
6075 | break; | |
b7df9ada | 6076 | case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): |
8a31db56 JF |
6077 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
6078 | return false; | |
f96da094 DB |
6079 | } |
6080 | ||
5e43f899 | 6081 | return bpf_skb_is_valid_access(off, size, type, prog, info); |
d691f9e8 AS |
6082 | } |
6083 | ||
1afaf661 | 6084 | static bool __is_valid_xdp_access(int off, int size) |
6a773a15 BB |
6085 | { |
6086 | if (off < 0 || off >= sizeof(struct xdp_md)) | |
6087 | return false; | |
6088 | if (off % size != 0) | |
6089 | return false; | |
6088b582 | 6090 | if (size != sizeof(__u32)) |
6a773a15 BB |
6091 | return false; |
6092 | ||
6093 | return true; | |
6094 | } | |
6095 | ||
6096 | static bool xdp_is_valid_access(int off, int size, | |
6097 | enum bpf_access_type type, | |
5e43f899 | 6098 | const struct bpf_prog *prog, |
23994631 | 6099 | struct bpf_insn_access_aux *info) |
6a773a15 | 6100 | { |
0d830032 JK |
6101 | if (type == BPF_WRITE) { |
6102 | if (bpf_prog_is_dev_bound(prog->aux)) { | |
6103 | switch (off) { | |
6104 | case offsetof(struct xdp_md, rx_queue_index): | |
6105 | return __is_valid_xdp_access(off, size); | |
6106 | } | |
6107 | } | |
6a773a15 | 6108 | return false; |
0d830032 | 6109 | } |
6a773a15 BB |
6110 | |
6111 | switch (off) { | |
6112 | case offsetof(struct xdp_md, data): | |
23994631 | 6113 | info->reg_type = PTR_TO_PACKET; |
6a773a15 | 6114 | break; |
de8f3a83 DB |
6115 | case offsetof(struct xdp_md, data_meta): |
6116 | info->reg_type = PTR_TO_PACKET_META; | |
6117 | break; | |
6a773a15 | 6118 | case offsetof(struct xdp_md, data_end): |
23994631 | 6119 | info->reg_type = PTR_TO_PACKET_END; |
6a773a15 BB |
6120 | break; |
6121 | } | |
6122 | ||
1afaf661 | 6123 | return __is_valid_xdp_access(off, size); |
6a773a15 BB |
6124 | } |
6125 | ||
6126 | void bpf_warn_invalid_xdp_action(u32 act) | |
6127 | { | |
9beb8bed DB |
6128 | const u32 act_max = XDP_REDIRECT; |
6129 | ||
6130 | WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n", | |
6131 | act > act_max ? "Illegal" : "Driver unsupported", | |
6132 | act); | |
6a773a15 BB |
6133 | } |
6134 | EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); | |
6135 | ||
4fbac77d AI |
6136 | static bool sock_addr_is_valid_access(int off, int size, |
6137 | enum bpf_access_type type, | |
6138 | const struct bpf_prog *prog, | |
6139 | struct bpf_insn_access_aux *info) | |
6140 | { | |
6141 | const int size_default = sizeof(__u32); | |
6142 | ||
6143 | if (off < 0 || off >= sizeof(struct bpf_sock_addr)) | |
6144 | return false; | |
6145 | if (off % size != 0) | |
6146 | return false; | |
6147 | ||
6148 | /* Disallow access to IPv6 fields from IPv4 contex and vise | |
6149 | * versa. | |
6150 | */ | |
6151 | switch (off) { | |
6152 | case bpf_ctx_range(struct bpf_sock_addr, user_ip4): | |
6153 | switch (prog->expected_attach_type) { | |
6154 | case BPF_CGROUP_INET4_BIND: | |
d74bad4e | 6155 | case BPF_CGROUP_INET4_CONNECT: |
1cedee13 | 6156 | case BPF_CGROUP_UDP4_SENDMSG: |
4fbac77d AI |
6157 | break; |
6158 | default: | |
6159 | return false; | |
6160 | } | |
6161 | break; | |
6162 | case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): | |
6163 | switch (prog->expected_attach_type) { | |
6164 | case BPF_CGROUP_INET6_BIND: | |
d74bad4e | 6165 | case BPF_CGROUP_INET6_CONNECT: |
1cedee13 AI |
6166 | case BPF_CGROUP_UDP6_SENDMSG: |
6167 | break; | |
6168 | default: | |
6169 | return false; | |
6170 | } | |
6171 | break; | |
6172 | case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): | |
6173 | switch (prog->expected_attach_type) { | |
6174 | case BPF_CGROUP_UDP4_SENDMSG: | |
6175 | break; | |
6176 | default: | |
6177 | return false; | |
6178 | } | |
6179 | break; | |
6180 | case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], | |
6181 | msg_src_ip6[3]): | |
6182 | switch (prog->expected_attach_type) { | |
6183 | case BPF_CGROUP_UDP6_SENDMSG: | |
4fbac77d AI |
6184 | break; |
6185 | default: | |
6186 | return false; | |
6187 | } | |
6188 | break; | |
6189 | } | |
6190 | ||
6191 | switch (off) { | |
6192 | case bpf_ctx_range(struct bpf_sock_addr, user_ip4): | |
6193 | case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): | |
1cedee13 AI |
6194 | case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): |
6195 | case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], | |
6196 | msg_src_ip6[3]): | |
4fbac77d AI |
6197 | /* Only narrow read access allowed for now. */ |
6198 | if (type == BPF_READ) { | |
6199 | bpf_ctx_record_field_size(info, size_default); | |
6200 | if (!bpf_ctx_narrow_access_ok(off, size, size_default)) | |
6201 | return false; | |
6202 | } else { | |
6203 | if (size != size_default) | |
6204 | return false; | |
6205 | } | |
6206 | break; | |
6207 | case bpf_ctx_range(struct bpf_sock_addr, user_port): | |
6208 | if (size != size_default) | |
6209 | return false; | |
6210 | break; | |
6211 | default: | |
6212 | if (type == BPF_READ) { | |
6213 | if (size != size_default) | |
6214 | return false; | |
6215 | } else { | |
6216 | return false; | |
6217 | } | |
6218 | } | |
6219 | ||
6220 | return true; | |
6221 | } | |
6222 | ||
44f0e430 LB |
6223 | static bool sock_ops_is_valid_access(int off, int size, |
6224 | enum bpf_access_type type, | |
5e43f899 | 6225 | const struct bpf_prog *prog, |
44f0e430 | 6226 | struct bpf_insn_access_aux *info) |
40304b2a | 6227 | { |
44f0e430 LB |
6228 | const int size_default = sizeof(__u32); |
6229 | ||
40304b2a LB |
6230 | if (off < 0 || off >= sizeof(struct bpf_sock_ops)) |
6231 | return false; | |
44f0e430 | 6232 | |
40304b2a LB |
6233 | /* The verifier guarantees that size > 0. */ |
6234 | if (off % size != 0) | |
6235 | return false; | |
40304b2a | 6236 | |
40304b2a LB |
6237 | if (type == BPF_WRITE) { |
6238 | switch (off) { | |
2585cd62 | 6239 | case offsetof(struct bpf_sock_ops, reply): |
6f9bd3d7 | 6240 | case offsetof(struct bpf_sock_ops, sk_txhash): |
44f0e430 LB |
6241 | if (size != size_default) |
6242 | return false; | |
40304b2a LB |
6243 | break; |
6244 | default: | |
6245 | return false; | |
6246 | } | |
44f0e430 LB |
6247 | } else { |
6248 | switch (off) { | |
6249 | case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received, | |
6250 | bytes_acked): | |
6251 | if (size != sizeof(__u64)) | |
6252 | return false; | |
6253 | break; | |
6254 | default: | |
6255 | if (size != size_default) | |
6256 | return false; | |
6257 | break; | |
6258 | } | |
40304b2a LB |
6259 | } |
6260 | ||
44f0e430 | 6261 | return true; |
40304b2a LB |
6262 | } |
6263 | ||
8a31db56 JF |
6264 | static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write, |
6265 | const struct bpf_prog *prog) | |
6266 | { | |
047b0ecd | 6267 | return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP); |
8a31db56 JF |
6268 | } |
6269 | ||
b005fd18 JF |
6270 | static bool sk_skb_is_valid_access(int off, int size, |
6271 | enum bpf_access_type type, | |
5e43f899 | 6272 | const struct bpf_prog *prog, |
b005fd18 JF |
6273 | struct bpf_insn_access_aux *info) |
6274 | { | |
de8f3a83 DB |
6275 | switch (off) { |
6276 | case bpf_ctx_range(struct __sk_buff, tc_classid): | |
6277 | case bpf_ctx_range(struct __sk_buff, data_meta): | |
b7df9ada | 6278 | case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): |
f11216b2 | 6279 | case bpf_ctx_range(struct __sk_buff, tstamp): |
e3da08d0 | 6280 | case bpf_ctx_range(struct __sk_buff, wire_len): |
de8f3a83 DB |
6281 | return false; |
6282 | } | |
6283 | ||
8a31db56 JF |
6284 | if (type == BPF_WRITE) { |
6285 | switch (off) { | |
8a31db56 JF |
6286 | case bpf_ctx_range(struct __sk_buff, tc_index): |
6287 | case bpf_ctx_range(struct __sk_buff, priority): | |
6288 | break; | |
6289 | default: | |
6290 | return false; | |
6291 | } | |
6292 | } | |
6293 | ||
b005fd18 | 6294 | switch (off) { |
f7e9cb1e | 6295 | case bpf_ctx_range(struct __sk_buff, mark): |
8a31db56 | 6296 | return false; |
b005fd18 JF |
6297 | case bpf_ctx_range(struct __sk_buff, data): |
6298 | info->reg_type = PTR_TO_PACKET; | |
6299 | break; | |
6300 | case bpf_ctx_range(struct __sk_buff, data_end): | |
6301 | info->reg_type = PTR_TO_PACKET_END; | |
6302 | break; | |
6303 | } | |
6304 | ||
5e43f899 | 6305 | return bpf_skb_is_valid_access(off, size, type, prog, info); |
b005fd18 JF |
6306 | } |
6307 | ||
4f738adb JF |
6308 | static bool sk_msg_is_valid_access(int off, int size, |
6309 | enum bpf_access_type type, | |
5e43f899 | 6310 | const struct bpf_prog *prog, |
4f738adb JF |
6311 | struct bpf_insn_access_aux *info) |
6312 | { | |
6313 | if (type == BPF_WRITE) | |
6314 | return false; | |
6315 | ||
bc1b4f01 JF |
6316 | if (off % size != 0) |
6317 | return false; | |
6318 | ||
4f738adb JF |
6319 | switch (off) { |
6320 | case offsetof(struct sk_msg_md, data): | |
6321 | info->reg_type = PTR_TO_PACKET; | |
303def35 JF |
6322 | if (size != sizeof(__u64)) |
6323 | return false; | |
4f738adb JF |
6324 | break; |
6325 | case offsetof(struct sk_msg_md, data_end): | |
6326 | info->reg_type = PTR_TO_PACKET_END; | |
303def35 JF |
6327 | if (size != sizeof(__u64)) |
6328 | return false; | |
4f738adb | 6329 | break; |
bc1b4f01 JF |
6330 | case bpf_ctx_range(struct sk_msg_md, family): |
6331 | case bpf_ctx_range(struct sk_msg_md, remote_ip4): | |
6332 | case bpf_ctx_range(struct sk_msg_md, local_ip4): | |
6333 | case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]): | |
6334 | case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]): | |
6335 | case bpf_ctx_range(struct sk_msg_md, remote_port): | |
6336 | case bpf_ctx_range(struct sk_msg_md, local_port): | |
6337 | case bpf_ctx_range(struct sk_msg_md, size): | |
303def35 JF |
6338 | if (size != sizeof(__u32)) |
6339 | return false; | |
bc1b4f01 JF |
6340 | break; |
6341 | default: | |
4f738adb | 6342 | return false; |
bc1b4f01 | 6343 | } |
4f738adb JF |
6344 | return true; |
6345 | } | |
6346 | ||
d58e468b PP |
6347 | static bool flow_dissector_is_valid_access(int off, int size, |
6348 | enum bpf_access_type type, | |
6349 | const struct bpf_prog *prog, | |
6350 | struct bpf_insn_access_aux *info) | |
6351 | { | |
6352 | if (type == BPF_WRITE) { | |
6353 | switch (off) { | |
6354 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
6355 | break; | |
6356 | default: | |
6357 | return false; | |
6358 | } | |
6359 | } | |
6360 | ||
6361 | switch (off) { | |
6362 | case bpf_ctx_range(struct __sk_buff, data): | |
6363 | info->reg_type = PTR_TO_PACKET; | |
6364 | break; | |
6365 | case bpf_ctx_range(struct __sk_buff, data_end): | |
6366 | info->reg_type = PTR_TO_PACKET_END; | |
6367 | break; | |
b7df9ada | 6368 | case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): |
d58e468b PP |
6369 | info->reg_type = PTR_TO_FLOW_KEYS; |
6370 | break; | |
6371 | case bpf_ctx_range(struct __sk_buff, tc_classid): | |
6372 | case bpf_ctx_range(struct __sk_buff, data_meta): | |
6373 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): | |
f11216b2 | 6374 | case bpf_ctx_range(struct __sk_buff, tstamp): |
e3da08d0 | 6375 | case bpf_ctx_range(struct __sk_buff, wire_len): |
d58e468b PP |
6376 | return false; |
6377 | } | |
6378 | ||
6379 | return bpf_skb_is_valid_access(off, size, type, prog, info); | |
6380 | } | |
6381 | ||
2492d3b8 DB |
6382 | static u32 bpf_convert_ctx_access(enum bpf_access_type type, |
6383 | const struct bpf_insn *si, | |
6384 | struct bpf_insn *insn_buf, | |
f96da094 | 6385 | struct bpf_prog *prog, u32 *target_size) |
9bac3d6d AS |
6386 | { |
6387 | struct bpf_insn *insn = insn_buf; | |
6b8cc1d1 | 6388 | int off; |
9bac3d6d | 6389 | |
6b8cc1d1 | 6390 | switch (si->off) { |
9bac3d6d | 6391 | case offsetof(struct __sk_buff, len): |
6b8cc1d1 | 6392 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
6393 | bpf_target_off(struct sk_buff, len, 4, |
6394 | target_size)); | |
9bac3d6d AS |
6395 | break; |
6396 | ||
0b8c707d | 6397 | case offsetof(struct __sk_buff, protocol): |
6b8cc1d1 | 6398 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
6399 | bpf_target_off(struct sk_buff, protocol, 2, |
6400 | target_size)); | |
0b8c707d DB |
6401 | break; |
6402 | ||
27cd5452 | 6403 | case offsetof(struct __sk_buff, vlan_proto): |
6b8cc1d1 | 6404 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
6405 | bpf_target_off(struct sk_buff, vlan_proto, 2, |
6406 | target_size)); | |
27cd5452 MS |
6407 | break; |
6408 | ||
bcad5718 | 6409 | case offsetof(struct __sk_buff, priority): |
754f1e6a | 6410 | if (type == BPF_WRITE) |
6b8cc1d1 | 6411 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
6412 | bpf_target_off(struct sk_buff, priority, 4, |
6413 | target_size)); | |
754f1e6a | 6414 | else |
6b8cc1d1 | 6415 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
6416 | bpf_target_off(struct sk_buff, priority, 4, |
6417 | target_size)); | |
bcad5718 DB |
6418 | break; |
6419 | ||
37e82c2f | 6420 | case offsetof(struct __sk_buff, ingress_ifindex): |
6b8cc1d1 | 6421 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
6422 | bpf_target_off(struct sk_buff, skb_iif, 4, |
6423 | target_size)); | |
37e82c2f AS |
6424 | break; |
6425 | ||
6426 | case offsetof(struct __sk_buff, ifindex): | |
f035a515 | 6427 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
6b8cc1d1 | 6428 | si->dst_reg, si->src_reg, |
37e82c2f | 6429 | offsetof(struct sk_buff, dev)); |
6b8cc1d1 DB |
6430 | *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); |
6431 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
f96da094 DB |
6432 | bpf_target_off(struct net_device, ifindex, 4, |
6433 | target_size)); | |
37e82c2f AS |
6434 | break; |
6435 | ||
ba7591d8 | 6436 | case offsetof(struct __sk_buff, hash): |
6b8cc1d1 | 6437 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
6438 | bpf_target_off(struct sk_buff, hash, 4, |
6439 | target_size)); | |
ba7591d8 DB |
6440 | break; |
6441 | ||
9bac3d6d | 6442 | case offsetof(struct __sk_buff, mark): |
d691f9e8 | 6443 | if (type == BPF_WRITE) |
6b8cc1d1 | 6444 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
6445 | bpf_target_off(struct sk_buff, mark, 4, |
6446 | target_size)); | |
d691f9e8 | 6447 | else |
6b8cc1d1 | 6448 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
6449 | bpf_target_off(struct sk_buff, mark, 4, |
6450 | target_size)); | |
d691f9e8 | 6451 | break; |
9bac3d6d AS |
6452 | |
6453 | case offsetof(struct __sk_buff, pkt_type): | |
f96da094 DB |
6454 | *target_size = 1; |
6455 | *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, | |
6456 | PKT_TYPE_OFFSET()); | |
6457 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); | |
6458 | #ifdef __BIG_ENDIAN_BITFIELD | |
6459 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); | |
6460 | #endif | |
6461 | break; | |
9bac3d6d AS |
6462 | |
6463 | case offsetof(struct __sk_buff, queue_mapping): | |
f96da094 DB |
6464 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
6465 | bpf_target_off(struct sk_buff, queue_mapping, 2, | |
6466 | target_size)); | |
6467 | break; | |
c2497395 | 6468 | |
c2497395 | 6469 | case offsetof(struct __sk_buff, vlan_present): |
9c212255 MM |
6470 | *target_size = 1; |
6471 | *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, | |
6472 | PKT_VLAN_PRESENT_OFFSET()); | |
6473 | if (PKT_VLAN_PRESENT_BIT) | |
6474 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, PKT_VLAN_PRESENT_BIT); | |
6475 | if (PKT_VLAN_PRESENT_BIT < 7) | |
6476 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1); | |
6477 | break; | |
f96da094 | 6478 | |
9c212255 | 6479 | case offsetof(struct __sk_buff, vlan_tci): |
f96da094 DB |
6480 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
6481 | bpf_target_off(struct sk_buff, vlan_tci, 2, | |
6482 | target_size)); | |
f96da094 | 6483 | break; |
d691f9e8 AS |
6484 | |
6485 | case offsetof(struct __sk_buff, cb[0]) ... | |
f96da094 | 6486 | offsetofend(struct __sk_buff, cb[4]) - 1: |
d691f9e8 | 6487 | BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, data) < 20); |
62c7989b DB |
6488 | BUILD_BUG_ON((offsetof(struct sk_buff, cb) + |
6489 | offsetof(struct qdisc_skb_cb, data)) % | |
6490 | sizeof(__u64)); | |
d691f9e8 | 6491 | |
ff936a04 | 6492 | prog->cb_access = 1; |
6b8cc1d1 DB |
6493 | off = si->off; |
6494 | off -= offsetof(struct __sk_buff, cb[0]); | |
6495 | off += offsetof(struct sk_buff, cb); | |
6496 | off += offsetof(struct qdisc_skb_cb, data); | |
d691f9e8 | 6497 | if (type == BPF_WRITE) |
62c7989b | 6498 | *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg, |
6b8cc1d1 | 6499 | si->src_reg, off); |
d691f9e8 | 6500 | else |
62c7989b | 6501 | *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, |
6b8cc1d1 | 6502 | si->src_reg, off); |
d691f9e8 AS |
6503 | break; |
6504 | ||
045efa82 | 6505 | case offsetof(struct __sk_buff, tc_classid): |
6b8cc1d1 DB |
6506 | BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, tc_classid) != 2); |
6507 | ||
6508 | off = si->off; | |
6509 | off -= offsetof(struct __sk_buff, tc_classid); | |
6510 | off += offsetof(struct sk_buff, cb); | |
6511 | off += offsetof(struct qdisc_skb_cb, tc_classid); | |
f96da094 | 6512 | *target_size = 2; |
09c37a2c | 6513 | if (type == BPF_WRITE) |
6b8cc1d1 DB |
6514 | *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, |
6515 | si->src_reg, off); | |
09c37a2c | 6516 | else |
6b8cc1d1 DB |
6517 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, |
6518 | si->src_reg, off); | |
045efa82 DB |
6519 | break; |
6520 | ||
db58ba45 | 6521 | case offsetof(struct __sk_buff, data): |
f035a515 | 6522 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), |
6b8cc1d1 | 6523 | si->dst_reg, si->src_reg, |
db58ba45 AS |
6524 | offsetof(struct sk_buff, data)); |
6525 | break; | |
6526 | ||
de8f3a83 DB |
6527 | case offsetof(struct __sk_buff, data_meta): |
6528 | off = si->off; | |
6529 | off -= offsetof(struct __sk_buff, data_meta); | |
6530 | off += offsetof(struct sk_buff, cb); | |
6531 | off += offsetof(struct bpf_skb_data_end, data_meta); | |
6532 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
6533 | si->src_reg, off); | |
6534 | break; | |
6535 | ||
db58ba45 | 6536 | case offsetof(struct __sk_buff, data_end): |
6b8cc1d1 DB |
6537 | off = si->off; |
6538 | off -= offsetof(struct __sk_buff, data_end); | |
6539 | off += offsetof(struct sk_buff, cb); | |
6540 | off += offsetof(struct bpf_skb_data_end, data_end); | |
6541 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
6542 | si->src_reg, off); | |
db58ba45 AS |
6543 | break; |
6544 | ||
d691f9e8 AS |
6545 | case offsetof(struct __sk_buff, tc_index): |
6546 | #ifdef CONFIG_NET_SCHED | |
d691f9e8 | 6547 | if (type == BPF_WRITE) |
6b8cc1d1 | 6548 | *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
6549 | bpf_target_off(struct sk_buff, tc_index, 2, |
6550 | target_size)); | |
d691f9e8 | 6551 | else |
6b8cc1d1 | 6552 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
6553 | bpf_target_off(struct sk_buff, tc_index, 2, |
6554 | target_size)); | |
d691f9e8 | 6555 | #else |
2ed46ce4 | 6556 | *target_size = 2; |
d691f9e8 | 6557 | if (type == BPF_WRITE) |
6b8cc1d1 | 6558 | *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); |
d691f9e8 | 6559 | else |
6b8cc1d1 | 6560 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
b1d9fc41 DB |
6561 | #endif |
6562 | break; | |
6563 | ||
6564 | case offsetof(struct __sk_buff, napi_id): | |
6565 | #if defined(CONFIG_NET_RX_BUSY_POLL) | |
b1d9fc41 | 6566 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
6567 | bpf_target_off(struct sk_buff, napi_id, 4, |
6568 | target_size)); | |
b1d9fc41 DB |
6569 | *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); |
6570 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); | |
6571 | #else | |
2ed46ce4 | 6572 | *target_size = 4; |
b1d9fc41 | 6573 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
d691f9e8 | 6574 | #endif |
6b8cc1d1 | 6575 | break; |
8a31db56 JF |
6576 | case offsetof(struct __sk_buff, family): |
6577 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); | |
6578 | ||
6579 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
6580 | si->dst_reg, si->src_reg, | |
6581 | offsetof(struct sk_buff, sk)); | |
6582 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
6583 | bpf_target_off(struct sock_common, | |
6584 | skc_family, | |
6585 | 2, target_size)); | |
6586 | break; | |
6587 | case offsetof(struct __sk_buff, remote_ip4): | |
6588 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); | |
6589 | ||
6590 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
6591 | si->dst_reg, si->src_reg, | |
6592 | offsetof(struct sk_buff, sk)); | |
6593 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
6594 | bpf_target_off(struct sock_common, | |
6595 | skc_daddr, | |
6596 | 4, target_size)); | |
6597 | break; | |
6598 | case offsetof(struct __sk_buff, local_ip4): | |
6599 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
6600 | skc_rcv_saddr) != 4); | |
6601 | ||
6602 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
6603 | si->dst_reg, si->src_reg, | |
6604 | offsetof(struct sk_buff, sk)); | |
6605 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
6606 | bpf_target_off(struct sock_common, | |
6607 | skc_rcv_saddr, | |
6608 | 4, target_size)); | |
6609 | break; | |
6610 | case offsetof(struct __sk_buff, remote_ip6[0]) ... | |
6611 | offsetof(struct __sk_buff, remote_ip6[3]): | |
6612 | #if IS_ENABLED(CONFIG_IPV6) | |
6613 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
6614 | skc_v6_daddr.s6_addr32[0]) != 4); | |
6615 | ||
6616 | off = si->off; | |
6617 | off -= offsetof(struct __sk_buff, remote_ip6[0]); | |
6618 | ||
6619 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
6620 | si->dst_reg, si->src_reg, | |
6621 | offsetof(struct sk_buff, sk)); | |
6622 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
6623 | offsetof(struct sock_common, | |
6624 | skc_v6_daddr.s6_addr32[0]) + | |
6625 | off); | |
6626 | #else | |
6627 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
6628 | #endif | |
6629 | break; | |
6630 | case offsetof(struct __sk_buff, local_ip6[0]) ... | |
6631 | offsetof(struct __sk_buff, local_ip6[3]): | |
6632 | #if IS_ENABLED(CONFIG_IPV6) | |
6633 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
6634 | skc_v6_rcv_saddr.s6_addr32[0]) != 4); | |
6635 | ||
6636 | off = si->off; | |
6637 | off -= offsetof(struct __sk_buff, local_ip6[0]); | |
6638 | ||
6639 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
6640 | si->dst_reg, si->src_reg, | |
6641 | offsetof(struct sk_buff, sk)); | |
6642 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
6643 | offsetof(struct sock_common, | |
6644 | skc_v6_rcv_saddr.s6_addr32[0]) + | |
6645 | off); | |
6646 | #else | |
6647 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
6648 | #endif | |
6649 | break; | |
6650 | ||
6651 | case offsetof(struct __sk_buff, remote_port): | |
6652 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); | |
6653 | ||
6654 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
6655 | si->dst_reg, si->src_reg, | |
6656 | offsetof(struct sk_buff, sk)); | |
6657 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
6658 | bpf_target_off(struct sock_common, | |
6659 | skc_dport, | |
6660 | 2, target_size)); | |
6661 | #ifndef __BIG_ENDIAN_BITFIELD | |
6662 | *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); | |
6663 | #endif | |
6664 | break; | |
6665 | ||
6666 | case offsetof(struct __sk_buff, local_port): | |
6667 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); | |
6668 | ||
6669 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
6670 | si->dst_reg, si->src_reg, | |
6671 | offsetof(struct sk_buff, sk)); | |
6672 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
6673 | bpf_target_off(struct sock_common, | |
6674 | skc_num, 2, target_size)); | |
6675 | break; | |
d58e468b PP |
6676 | |
6677 | case offsetof(struct __sk_buff, flow_keys): | |
6678 | off = si->off; | |
6679 | off -= offsetof(struct __sk_buff, flow_keys); | |
6680 | off += offsetof(struct sk_buff, cb); | |
6681 | off += offsetof(struct qdisc_skb_cb, flow_keys); | |
6682 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
6683 | si->src_reg, off); | |
6684 | break; | |
f11216b2 VD |
6685 | |
6686 | case offsetof(struct __sk_buff, tstamp): | |
6687 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, tstamp) != 8); | |
6688 | ||
6689 | if (type == BPF_WRITE) | |
6690 | *insn++ = BPF_STX_MEM(BPF_DW, | |
6691 | si->dst_reg, si->src_reg, | |
6692 | bpf_target_off(struct sk_buff, | |
6693 | tstamp, 8, | |
6694 | target_size)); | |
6695 | else | |
6696 | *insn++ = BPF_LDX_MEM(BPF_DW, | |
6697 | si->dst_reg, si->src_reg, | |
6698 | bpf_target_off(struct sk_buff, | |
6699 | tstamp, 8, | |
6700 | target_size)); | |
e3da08d0 PP |
6701 | break; |
6702 | ||
6703 | case offsetof(struct __sk_buff, wire_len): | |
6704 | BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, pkt_len) != 4); | |
6705 | ||
6706 | off = si->off; | |
6707 | off -= offsetof(struct __sk_buff, wire_len); | |
6708 | off += offsetof(struct sk_buff, cb); | |
6709 | off += offsetof(struct qdisc_skb_cb, pkt_len); | |
6710 | *target_size = 4; | |
6711 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off); | |
9bac3d6d AS |
6712 | } |
6713 | ||
6714 | return insn - insn_buf; | |
89aa0758 AS |
6715 | } |
6716 | ||
c64b7983 JS |
6717 | u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, |
6718 | const struct bpf_insn *si, | |
6719 | struct bpf_insn *insn_buf, | |
6720 | struct bpf_prog *prog, u32 *target_size) | |
61023658 DA |
6721 | { |
6722 | struct bpf_insn *insn = insn_buf; | |
aac3fc32 | 6723 | int off; |
61023658 | 6724 | |
6b8cc1d1 | 6725 | switch (si->off) { |
61023658 DA |
6726 | case offsetof(struct bpf_sock, bound_dev_if): |
6727 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_bound_dev_if) != 4); | |
6728 | ||
6729 | if (type == BPF_WRITE) | |
6b8cc1d1 | 6730 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
61023658 DA |
6731 | offsetof(struct sock, sk_bound_dev_if)); |
6732 | else | |
6b8cc1d1 | 6733 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
61023658 DA |
6734 | offsetof(struct sock, sk_bound_dev_if)); |
6735 | break; | |
aa4c1037 | 6736 | |
482dca93 DA |
6737 | case offsetof(struct bpf_sock, mark): |
6738 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_mark) != 4); | |
6739 | ||
6740 | if (type == BPF_WRITE) | |
6741 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
6742 | offsetof(struct sock, sk_mark)); | |
6743 | else | |
6744 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
6745 | offsetof(struct sock, sk_mark)); | |
6746 | break; | |
6747 | ||
6748 | case offsetof(struct bpf_sock, priority): | |
6749 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_priority) != 4); | |
6750 | ||
6751 | if (type == BPF_WRITE) | |
6752 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
6753 | offsetof(struct sock, sk_priority)); | |
6754 | else | |
6755 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
6756 | offsetof(struct sock, sk_priority)); | |
6757 | break; | |
6758 | ||
aa4c1037 DA |
6759 | case offsetof(struct bpf_sock, family): |
6760 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_family) != 2); | |
6761 | ||
6b8cc1d1 | 6762 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
aa4c1037 DA |
6763 | offsetof(struct sock, sk_family)); |
6764 | break; | |
6765 | ||
6766 | case offsetof(struct bpf_sock, type): | |
6b8cc1d1 | 6767 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
aa4c1037 | 6768 | offsetof(struct sock, __sk_flags_offset)); |
6b8cc1d1 DB |
6769 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK); |
6770 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT); | |
aa4c1037 DA |
6771 | break; |
6772 | ||
6773 | case offsetof(struct bpf_sock, protocol): | |
6b8cc1d1 | 6774 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
aa4c1037 | 6775 | offsetof(struct sock, __sk_flags_offset)); |
6b8cc1d1 DB |
6776 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK); |
6777 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_PROTO_SHIFT); | |
aa4c1037 | 6778 | break; |
aac3fc32 AI |
6779 | |
6780 | case offsetof(struct bpf_sock, src_ip4): | |
6781 | *insn++ = BPF_LDX_MEM( | |
6782 | BPF_SIZE(si->code), si->dst_reg, si->src_reg, | |
6783 | bpf_target_off(struct sock_common, skc_rcv_saddr, | |
6784 | FIELD_SIZEOF(struct sock_common, | |
6785 | skc_rcv_saddr), | |
6786 | target_size)); | |
6787 | break; | |
6788 | ||
6789 | case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): | |
6790 | #if IS_ENABLED(CONFIG_IPV6) | |
6791 | off = si->off; | |
6792 | off -= offsetof(struct bpf_sock, src_ip6[0]); | |
6793 | *insn++ = BPF_LDX_MEM( | |
6794 | BPF_SIZE(si->code), si->dst_reg, si->src_reg, | |
6795 | bpf_target_off( | |
6796 | struct sock_common, | |
6797 | skc_v6_rcv_saddr.s6_addr32[0], | |
6798 | FIELD_SIZEOF(struct sock_common, | |
6799 | skc_v6_rcv_saddr.s6_addr32[0]), | |
6800 | target_size) + off); | |
6801 | #else | |
6802 | (void)off; | |
6803 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
6804 | #endif | |
6805 | break; | |
6806 | ||
6807 | case offsetof(struct bpf_sock, src_port): | |
6808 | *insn++ = BPF_LDX_MEM( | |
6809 | BPF_FIELD_SIZEOF(struct sock_common, skc_num), | |
6810 | si->dst_reg, si->src_reg, | |
6811 | bpf_target_off(struct sock_common, skc_num, | |
6812 | FIELD_SIZEOF(struct sock_common, | |
6813 | skc_num), | |
6814 | target_size)); | |
6815 | break; | |
61023658 DA |
6816 | } |
6817 | ||
6818 | return insn - insn_buf; | |
6819 | } | |
6820 | ||
6b8cc1d1 DB |
6821 | static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, |
6822 | const struct bpf_insn *si, | |
374fb54e | 6823 | struct bpf_insn *insn_buf, |
f96da094 | 6824 | struct bpf_prog *prog, u32 *target_size) |
374fb54e DB |
6825 | { |
6826 | struct bpf_insn *insn = insn_buf; | |
6827 | ||
6b8cc1d1 | 6828 | switch (si->off) { |
374fb54e | 6829 | case offsetof(struct __sk_buff, ifindex): |
374fb54e | 6830 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
6b8cc1d1 | 6831 | si->dst_reg, si->src_reg, |
374fb54e | 6832 | offsetof(struct sk_buff, dev)); |
6b8cc1d1 | 6833 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
f96da094 DB |
6834 | bpf_target_off(struct net_device, ifindex, 4, |
6835 | target_size)); | |
374fb54e DB |
6836 | break; |
6837 | default: | |
f96da094 DB |
6838 | return bpf_convert_ctx_access(type, si, insn_buf, prog, |
6839 | target_size); | |
374fb54e DB |
6840 | } |
6841 | ||
6842 | return insn - insn_buf; | |
6843 | } | |
6844 | ||
6b8cc1d1 DB |
6845 | static u32 xdp_convert_ctx_access(enum bpf_access_type type, |
6846 | const struct bpf_insn *si, | |
6a773a15 | 6847 | struct bpf_insn *insn_buf, |
f96da094 | 6848 | struct bpf_prog *prog, u32 *target_size) |
6a773a15 BB |
6849 | { |
6850 | struct bpf_insn *insn = insn_buf; | |
6851 | ||
6b8cc1d1 | 6852 | switch (si->off) { |
6a773a15 | 6853 | case offsetof(struct xdp_md, data): |
f035a515 | 6854 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), |
6b8cc1d1 | 6855 | si->dst_reg, si->src_reg, |
6a773a15 BB |
6856 | offsetof(struct xdp_buff, data)); |
6857 | break; | |
de8f3a83 DB |
6858 | case offsetof(struct xdp_md, data_meta): |
6859 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta), | |
6860 | si->dst_reg, si->src_reg, | |
6861 | offsetof(struct xdp_buff, data_meta)); | |
6862 | break; | |
6a773a15 | 6863 | case offsetof(struct xdp_md, data_end): |
f035a515 | 6864 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), |
6b8cc1d1 | 6865 | si->dst_reg, si->src_reg, |
6a773a15 BB |
6866 | offsetof(struct xdp_buff, data_end)); |
6867 | break; | |
02dd3291 JDB |
6868 | case offsetof(struct xdp_md, ingress_ifindex): |
6869 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), | |
6870 | si->dst_reg, si->src_reg, | |
6871 | offsetof(struct xdp_buff, rxq)); | |
6872 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev), | |
6873 | si->dst_reg, si->dst_reg, | |
6874 | offsetof(struct xdp_rxq_info, dev)); | |
6875 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
daaf24c6 | 6876 | offsetof(struct net_device, ifindex)); |
02dd3291 JDB |
6877 | break; |
6878 | case offsetof(struct xdp_md, rx_queue_index): | |
6879 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), | |
6880 | si->dst_reg, si->src_reg, | |
6881 | offsetof(struct xdp_buff, rxq)); | |
6882 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
daaf24c6 JDB |
6883 | offsetof(struct xdp_rxq_info, |
6884 | queue_index)); | |
02dd3291 | 6885 | break; |
6a773a15 BB |
6886 | } |
6887 | ||
6888 | return insn - insn_buf; | |
6889 | } | |
6890 | ||
4fbac77d AI |
6891 | /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of |
6892 | * context Structure, F is Field in context structure that contains a pointer | |
6893 | * to Nested Structure of type NS that has the field NF. | |
6894 | * | |
6895 | * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make | |
6896 | * sure that SIZE is not greater than actual size of S.F.NF. | |
6897 | * | |
6898 | * If offset OFF is provided, the load happens from that offset relative to | |
6899 | * offset of NF. | |
6900 | */ | |
6901 | #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \ | |
6902 | do { \ | |
6903 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \ | |
6904 | si->src_reg, offsetof(S, F)); \ | |
6905 | *insn++ = BPF_LDX_MEM( \ | |
6906 | SIZE, si->dst_reg, si->dst_reg, \ | |
6907 | bpf_target_off(NS, NF, FIELD_SIZEOF(NS, NF), \ | |
6908 | target_size) \ | |
6909 | + OFF); \ | |
6910 | } while (0) | |
6911 | ||
6912 | #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \ | |
6913 | SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \ | |
6914 | BPF_FIELD_SIZEOF(NS, NF), 0) | |
6915 | ||
6916 | /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to | |
6917 | * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation. | |
6918 | * | |
6919 | * It doesn't support SIZE argument though since narrow stores are not | |
6920 | * supported for now. | |
6921 | * | |
6922 | * In addition it uses Temporary Field TF (member of struct S) as the 3rd | |
6923 | * "register" since two registers available in convert_ctx_access are not | |
6924 | * enough: we can't override neither SRC, since it contains value to store, nor | |
6925 | * DST since it contains pointer to context that may be used by later | |
6926 | * instructions. But we need a temporary place to save pointer to nested | |
6927 | * structure whose field we want to store to. | |
6928 | */ | |
6929 | #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, OFF, TF) \ | |
6930 | do { \ | |
6931 | int tmp_reg = BPF_REG_9; \ | |
6932 | if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ | |
6933 | --tmp_reg; \ | |
6934 | if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ | |
6935 | --tmp_reg; \ | |
6936 | *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \ | |
6937 | offsetof(S, TF)); \ | |
6938 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \ | |
6939 | si->dst_reg, offsetof(S, F)); \ | |
6940 | *insn++ = BPF_STX_MEM( \ | |
6941 | BPF_FIELD_SIZEOF(NS, NF), tmp_reg, si->src_reg, \ | |
6942 | bpf_target_off(NS, NF, FIELD_SIZEOF(NS, NF), \ | |
6943 | target_size) \ | |
6944 | + OFF); \ | |
6945 | *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \ | |
6946 | offsetof(S, TF)); \ | |
6947 | } while (0) | |
6948 | ||
6949 | #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \ | |
6950 | TF) \ | |
6951 | do { \ | |
6952 | if (type == BPF_WRITE) { \ | |
6953 | SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, OFF, \ | |
6954 | TF); \ | |
6955 | } else { \ | |
6956 | SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \ | |
6957 | S, NS, F, NF, SIZE, OFF); \ | |
6958 | } \ | |
6959 | } while (0) | |
6960 | ||
6961 | #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \ | |
6962 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \ | |
6963 | S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF) | |
6964 | ||
6965 | static u32 sock_addr_convert_ctx_access(enum bpf_access_type type, | |
6966 | const struct bpf_insn *si, | |
6967 | struct bpf_insn *insn_buf, | |
6968 | struct bpf_prog *prog, u32 *target_size) | |
6969 | { | |
6970 | struct bpf_insn *insn = insn_buf; | |
6971 | int off; | |
6972 | ||
6973 | switch (si->off) { | |
6974 | case offsetof(struct bpf_sock_addr, user_family): | |
6975 | SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, | |
6976 | struct sockaddr, uaddr, sa_family); | |
6977 | break; | |
6978 | ||
6979 | case offsetof(struct bpf_sock_addr, user_ip4): | |
6980 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( | |
6981 | struct bpf_sock_addr_kern, struct sockaddr_in, uaddr, | |
6982 | sin_addr, BPF_SIZE(si->code), 0, tmp_reg); | |
6983 | break; | |
6984 | ||
6985 | case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): | |
6986 | off = si->off; | |
6987 | off -= offsetof(struct bpf_sock_addr, user_ip6[0]); | |
6988 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( | |
6989 | struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, | |
6990 | sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off, | |
6991 | tmp_reg); | |
6992 | break; | |
6993 | ||
6994 | case offsetof(struct bpf_sock_addr, user_port): | |
6995 | /* To get port we need to know sa_family first and then treat | |
6996 | * sockaddr as either sockaddr_in or sockaddr_in6. | |
6997 | * Though we can simplify since port field has same offset and | |
6998 | * size in both structures. | |
6999 | * Here we check this invariant and use just one of the | |
7000 | * structures if it's true. | |
7001 | */ | |
7002 | BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) != | |
7003 | offsetof(struct sockaddr_in6, sin6_port)); | |
7004 | BUILD_BUG_ON(FIELD_SIZEOF(struct sockaddr_in, sin_port) != | |
7005 | FIELD_SIZEOF(struct sockaddr_in6, sin6_port)); | |
7006 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(struct bpf_sock_addr_kern, | |
7007 | struct sockaddr_in6, uaddr, | |
7008 | sin6_port, tmp_reg); | |
7009 | break; | |
7010 | ||
7011 | case offsetof(struct bpf_sock_addr, family): | |
7012 | SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, | |
7013 | struct sock, sk, sk_family); | |
7014 | break; | |
7015 | ||
7016 | case offsetof(struct bpf_sock_addr, type): | |
7017 | SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( | |
7018 | struct bpf_sock_addr_kern, struct sock, sk, | |
7019 | __sk_flags_offset, BPF_W, 0); | |
7020 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK); | |
7021 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT); | |
7022 | break; | |
7023 | ||
7024 | case offsetof(struct bpf_sock_addr, protocol): | |
7025 | SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( | |
7026 | struct bpf_sock_addr_kern, struct sock, sk, | |
7027 | __sk_flags_offset, BPF_W, 0); | |
7028 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK); | |
7029 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, | |
7030 | SK_FL_PROTO_SHIFT); | |
7031 | break; | |
1cedee13 AI |
7032 | |
7033 | case offsetof(struct bpf_sock_addr, msg_src_ip4): | |
7034 | /* Treat t_ctx as struct in_addr for msg_src_ip4. */ | |
7035 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( | |
7036 | struct bpf_sock_addr_kern, struct in_addr, t_ctx, | |
7037 | s_addr, BPF_SIZE(si->code), 0, tmp_reg); | |
7038 | break; | |
7039 | ||
7040 | case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], | |
7041 | msg_src_ip6[3]): | |
7042 | off = si->off; | |
7043 | off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]); | |
7044 | /* Treat t_ctx as struct in6_addr for msg_src_ip6. */ | |
7045 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( | |
7046 | struct bpf_sock_addr_kern, struct in6_addr, t_ctx, | |
7047 | s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg); | |
7048 | break; | |
4fbac77d AI |
7049 | } |
7050 | ||
7051 | return insn - insn_buf; | |
7052 | } | |
7053 | ||
40304b2a LB |
7054 | static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, |
7055 | const struct bpf_insn *si, | |
7056 | struct bpf_insn *insn_buf, | |
f96da094 DB |
7057 | struct bpf_prog *prog, |
7058 | u32 *target_size) | |
40304b2a LB |
7059 | { |
7060 | struct bpf_insn *insn = insn_buf; | |
7061 | int off; | |
7062 | ||
7063 | switch (si->off) { | |
7064 | case offsetof(struct bpf_sock_ops, op) ... | |
7065 | offsetof(struct bpf_sock_ops, replylong[3]): | |
7066 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, op) != | |
7067 | FIELD_SIZEOF(struct bpf_sock_ops_kern, op)); | |
7068 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, reply) != | |
7069 | FIELD_SIZEOF(struct bpf_sock_ops_kern, reply)); | |
7070 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, replylong) != | |
7071 | FIELD_SIZEOF(struct bpf_sock_ops_kern, replylong)); | |
7072 | off = si->off; | |
7073 | off -= offsetof(struct bpf_sock_ops, op); | |
7074 | off += offsetof(struct bpf_sock_ops_kern, op); | |
7075 | if (type == BPF_WRITE) | |
7076 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
7077 | off); | |
7078 | else | |
7079 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
7080 | off); | |
7081 | break; | |
7082 | ||
7083 | case offsetof(struct bpf_sock_ops, family): | |
7084 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); | |
7085 | ||
7086 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
7087 | struct bpf_sock_ops_kern, sk), | |
7088 | si->dst_reg, si->src_reg, | |
7089 | offsetof(struct bpf_sock_ops_kern, sk)); | |
7090 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
7091 | offsetof(struct sock_common, skc_family)); | |
7092 | break; | |
7093 | ||
7094 | case offsetof(struct bpf_sock_ops, remote_ip4): | |
7095 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); | |
7096 | ||
7097 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
7098 | struct bpf_sock_ops_kern, sk), | |
7099 | si->dst_reg, si->src_reg, | |
7100 | offsetof(struct bpf_sock_ops_kern, sk)); | |
7101 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
7102 | offsetof(struct sock_common, skc_daddr)); | |
7103 | break; | |
7104 | ||
7105 | case offsetof(struct bpf_sock_ops, local_ip4): | |
303def35 JF |
7106 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, |
7107 | skc_rcv_saddr) != 4); | |
40304b2a LB |
7108 | |
7109 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
7110 | struct bpf_sock_ops_kern, sk), | |
7111 | si->dst_reg, si->src_reg, | |
7112 | offsetof(struct bpf_sock_ops_kern, sk)); | |
7113 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
7114 | offsetof(struct sock_common, | |
7115 | skc_rcv_saddr)); | |
7116 | break; | |
7117 | ||
7118 | case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... | |
7119 | offsetof(struct bpf_sock_ops, remote_ip6[3]): | |
7120 | #if IS_ENABLED(CONFIG_IPV6) | |
7121 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
7122 | skc_v6_daddr.s6_addr32[0]) != 4); | |
7123 | ||
7124 | off = si->off; | |
7125 | off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); | |
7126 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
7127 | struct bpf_sock_ops_kern, sk), | |
7128 | si->dst_reg, si->src_reg, | |
7129 | offsetof(struct bpf_sock_ops_kern, sk)); | |
7130 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
7131 | offsetof(struct sock_common, | |
7132 | skc_v6_daddr.s6_addr32[0]) + | |
7133 | off); | |
7134 | #else | |
7135 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
7136 | #endif | |
7137 | break; | |
7138 | ||
7139 | case offsetof(struct bpf_sock_ops, local_ip6[0]) ... | |
7140 | offsetof(struct bpf_sock_ops, local_ip6[3]): | |
7141 | #if IS_ENABLED(CONFIG_IPV6) | |
7142 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
7143 | skc_v6_rcv_saddr.s6_addr32[0]) != 4); | |
7144 | ||
7145 | off = si->off; | |
7146 | off -= offsetof(struct bpf_sock_ops, local_ip6[0]); | |
7147 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
7148 | struct bpf_sock_ops_kern, sk), | |
7149 | si->dst_reg, si->src_reg, | |
7150 | offsetof(struct bpf_sock_ops_kern, sk)); | |
7151 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
7152 | offsetof(struct sock_common, | |
7153 | skc_v6_rcv_saddr.s6_addr32[0]) + | |
7154 | off); | |
7155 | #else | |
7156 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
7157 | #endif | |
7158 | break; | |
7159 | ||
7160 | case offsetof(struct bpf_sock_ops, remote_port): | |
7161 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); | |
7162 | ||
7163 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
7164 | struct bpf_sock_ops_kern, sk), | |
7165 | si->dst_reg, si->src_reg, | |
7166 | offsetof(struct bpf_sock_ops_kern, sk)); | |
7167 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
7168 | offsetof(struct sock_common, skc_dport)); | |
7169 | #ifndef __BIG_ENDIAN_BITFIELD | |
7170 | *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); | |
7171 | #endif | |
7172 | break; | |
7173 | ||
7174 | case offsetof(struct bpf_sock_ops, local_port): | |
7175 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); | |
7176 | ||
7177 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
7178 | struct bpf_sock_ops_kern, sk), | |
7179 | si->dst_reg, si->src_reg, | |
7180 | offsetof(struct bpf_sock_ops_kern, sk)); | |
7181 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
7182 | offsetof(struct sock_common, skc_num)); | |
7183 | break; | |
f19397a5 LB |
7184 | |
7185 | case offsetof(struct bpf_sock_ops, is_fullsock): | |
7186 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
7187 | struct bpf_sock_ops_kern, | |
7188 | is_fullsock), | |
7189 | si->dst_reg, si->src_reg, | |
7190 | offsetof(struct bpf_sock_ops_kern, | |
7191 | is_fullsock)); | |
7192 | break; | |
7193 | ||
44f0e430 LB |
7194 | case offsetof(struct bpf_sock_ops, state): |
7195 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_state) != 1); | |
7196 | ||
7197 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
7198 | struct bpf_sock_ops_kern, sk), | |
7199 | si->dst_reg, si->src_reg, | |
7200 | offsetof(struct bpf_sock_ops_kern, sk)); | |
7201 | *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg, | |
7202 | offsetof(struct sock_common, skc_state)); | |
7203 | break; | |
7204 | ||
7205 | case offsetof(struct bpf_sock_ops, rtt_min): | |
7206 | BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, rtt_min) != | |
7207 | sizeof(struct minmax)); | |
7208 | BUILD_BUG_ON(sizeof(struct minmax) < | |
7209 | sizeof(struct minmax_sample)); | |
7210 | ||
7211 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
7212 | struct bpf_sock_ops_kern, sk), | |
7213 | si->dst_reg, si->src_reg, | |
7214 | offsetof(struct bpf_sock_ops_kern, sk)); | |
7215 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
7216 | offsetof(struct tcp_sock, rtt_min) + | |
7217 | FIELD_SIZEOF(struct minmax_sample, t)); | |
7218 | break; | |
7219 | ||
34d367c5 LB |
7220 | /* Helper macro for adding read access to tcp_sock or sock fields. */ |
7221 | #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ | |
f19397a5 | 7222 | do { \ |
34d367c5 LB |
7223 | BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \ |
7224 | FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \ | |
f19397a5 LB |
7225 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ |
7226 | struct bpf_sock_ops_kern, \ | |
7227 | is_fullsock), \ | |
7228 | si->dst_reg, si->src_reg, \ | |
7229 | offsetof(struct bpf_sock_ops_kern, \ | |
7230 | is_fullsock)); \ | |
7231 | *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 2); \ | |
7232 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ | |
7233 | struct bpf_sock_ops_kern, sk),\ | |
7234 | si->dst_reg, si->src_reg, \ | |
7235 | offsetof(struct bpf_sock_ops_kern, sk));\ | |
34d367c5 LB |
7236 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \ |
7237 | OBJ_FIELD), \ | |
7238 | si->dst_reg, si->dst_reg, \ | |
7239 | offsetof(OBJ, OBJ_FIELD)); \ | |
f19397a5 LB |
7240 | } while (0) |
7241 | ||
b73042b8 LB |
7242 | /* Helper macro for adding write access to tcp_sock or sock fields. |
7243 | * The macro is called with two registers, dst_reg which contains a pointer | |
7244 | * to ctx (context) and src_reg which contains the value that should be | |
7245 | * stored. However, we need an additional register since we cannot overwrite | |
7246 | * dst_reg because it may be used later in the program. | |
7247 | * Instead we "borrow" one of the other register. We first save its value | |
7248 | * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore | |
7249 | * it at the end of the macro. | |
7250 | */ | |
7251 | #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ | |
7252 | do { \ | |
7253 | int reg = BPF_REG_9; \ | |
7254 | BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \ | |
7255 | FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \ | |
7256 | if (si->dst_reg == reg || si->src_reg == reg) \ | |
7257 | reg--; \ | |
7258 | if (si->dst_reg == reg || si->src_reg == reg) \ | |
7259 | reg--; \ | |
7260 | *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \ | |
7261 | offsetof(struct bpf_sock_ops_kern, \ | |
7262 | temp)); \ | |
7263 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ | |
7264 | struct bpf_sock_ops_kern, \ | |
7265 | is_fullsock), \ | |
7266 | reg, si->dst_reg, \ | |
7267 | offsetof(struct bpf_sock_ops_kern, \ | |
7268 | is_fullsock)); \ | |
7269 | *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \ | |
7270 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ | |
7271 | struct bpf_sock_ops_kern, sk),\ | |
7272 | reg, si->dst_reg, \ | |
7273 | offsetof(struct bpf_sock_ops_kern, sk));\ | |
7274 | *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD), \ | |
7275 | reg, si->src_reg, \ | |
7276 | offsetof(OBJ, OBJ_FIELD)); \ | |
7277 | *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \ | |
7278 | offsetof(struct bpf_sock_ops_kern, \ | |
7279 | temp)); \ | |
7280 | } while (0) | |
7281 | ||
7282 | #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \ | |
7283 | do { \ | |
7284 | if (TYPE == BPF_WRITE) \ | |
7285 | SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ | |
7286 | else \ | |
7287 | SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ | |
7288 | } while (0) | |
7289 | ||
f19397a5 | 7290 | case offsetof(struct bpf_sock_ops, snd_cwnd): |
34d367c5 | 7291 | SOCK_OPS_GET_FIELD(snd_cwnd, snd_cwnd, struct tcp_sock); |
f19397a5 LB |
7292 | break; |
7293 | ||
7294 | case offsetof(struct bpf_sock_ops, srtt_us): | |
34d367c5 | 7295 | SOCK_OPS_GET_FIELD(srtt_us, srtt_us, struct tcp_sock); |
f19397a5 | 7296 | break; |
b13d8807 LB |
7297 | |
7298 | case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags): | |
7299 | SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags, | |
7300 | struct tcp_sock); | |
7301 | break; | |
44f0e430 LB |
7302 | |
7303 | case offsetof(struct bpf_sock_ops, snd_ssthresh): | |
7304 | SOCK_OPS_GET_FIELD(snd_ssthresh, snd_ssthresh, struct tcp_sock); | |
7305 | break; | |
7306 | ||
7307 | case offsetof(struct bpf_sock_ops, rcv_nxt): | |
7308 | SOCK_OPS_GET_FIELD(rcv_nxt, rcv_nxt, struct tcp_sock); | |
7309 | break; | |
7310 | ||
7311 | case offsetof(struct bpf_sock_ops, snd_nxt): | |
7312 | SOCK_OPS_GET_FIELD(snd_nxt, snd_nxt, struct tcp_sock); | |
7313 | break; | |
7314 | ||
7315 | case offsetof(struct bpf_sock_ops, snd_una): | |
7316 | SOCK_OPS_GET_FIELD(snd_una, snd_una, struct tcp_sock); | |
7317 | break; | |
7318 | ||
7319 | case offsetof(struct bpf_sock_ops, mss_cache): | |
7320 | SOCK_OPS_GET_FIELD(mss_cache, mss_cache, struct tcp_sock); | |
7321 | break; | |
7322 | ||
7323 | case offsetof(struct bpf_sock_ops, ecn_flags): | |
7324 | SOCK_OPS_GET_FIELD(ecn_flags, ecn_flags, struct tcp_sock); | |
7325 | break; | |
7326 | ||
7327 | case offsetof(struct bpf_sock_ops, rate_delivered): | |
7328 | SOCK_OPS_GET_FIELD(rate_delivered, rate_delivered, | |
7329 | struct tcp_sock); | |
7330 | break; | |
7331 | ||
7332 | case offsetof(struct bpf_sock_ops, rate_interval_us): | |
7333 | SOCK_OPS_GET_FIELD(rate_interval_us, rate_interval_us, | |
7334 | struct tcp_sock); | |
7335 | break; | |
7336 | ||
7337 | case offsetof(struct bpf_sock_ops, packets_out): | |
7338 | SOCK_OPS_GET_FIELD(packets_out, packets_out, struct tcp_sock); | |
7339 | break; | |
7340 | ||
7341 | case offsetof(struct bpf_sock_ops, retrans_out): | |
7342 | SOCK_OPS_GET_FIELD(retrans_out, retrans_out, struct tcp_sock); | |
7343 | break; | |
7344 | ||
7345 | case offsetof(struct bpf_sock_ops, total_retrans): | |
7346 | SOCK_OPS_GET_FIELD(total_retrans, total_retrans, | |
7347 | struct tcp_sock); | |
7348 | break; | |
7349 | ||
7350 | case offsetof(struct bpf_sock_ops, segs_in): | |
7351 | SOCK_OPS_GET_FIELD(segs_in, segs_in, struct tcp_sock); | |
7352 | break; | |
7353 | ||
7354 | case offsetof(struct bpf_sock_ops, data_segs_in): | |
7355 | SOCK_OPS_GET_FIELD(data_segs_in, data_segs_in, struct tcp_sock); | |
7356 | break; | |
7357 | ||
7358 | case offsetof(struct bpf_sock_ops, segs_out): | |
7359 | SOCK_OPS_GET_FIELD(segs_out, segs_out, struct tcp_sock); | |
7360 | break; | |
7361 | ||
7362 | case offsetof(struct bpf_sock_ops, data_segs_out): | |
7363 | SOCK_OPS_GET_FIELD(data_segs_out, data_segs_out, | |
7364 | struct tcp_sock); | |
7365 | break; | |
7366 | ||
7367 | case offsetof(struct bpf_sock_ops, lost_out): | |
7368 | SOCK_OPS_GET_FIELD(lost_out, lost_out, struct tcp_sock); | |
7369 | break; | |
7370 | ||
7371 | case offsetof(struct bpf_sock_ops, sacked_out): | |
7372 | SOCK_OPS_GET_FIELD(sacked_out, sacked_out, struct tcp_sock); | |
7373 | break; | |
7374 | ||
7375 | case offsetof(struct bpf_sock_ops, sk_txhash): | |
6f9bd3d7 LB |
7376 | SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash, |
7377 | struct sock, type); | |
44f0e430 LB |
7378 | break; |
7379 | ||
7380 | case offsetof(struct bpf_sock_ops, bytes_received): | |
7381 | SOCK_OPS_GET_FIELD(bytes_received, bytes_received, | |
7382 | struct tcp_sock); | |
7383 | break; | |
7384 | ||
7385 | case offsetof(struct bpf_sock_ops, bytes_acked): | |
7386 | SOCK_OPS_GET_FIELD(bytes_acked, bytes_acked, struct tcp_sock); | |
7387 | break; | |
6f9bd3d7 | 7388 | |
40304b2a LB |
7389 | } |
7390 | return insn - insn_buf; | |
7391 | } | |
7392 | ||
8108a775 JF |
7393 | static u32 sk_skb_convert_ctx_access(enum bpf_access_type type, |
7394 | const struct bpf_insn *si, | |
7395 | struct bpf_insn *insn_buf, | |
7396 | struct bpf_prog *prog, u32 *target_size) | |
7397 | { | |
7398 | struct bpf_insn *insn = insn_buf; | |
7399 | int off; | |
7400 | ||
7401 | switch (si->off) { | |
7402 | case offsetof(struct __sk_buff, data_end): | |
7403 | off = si->off; | |
7404 | off -= offsetof(struct __sk_buff, data_end); | |
7405 | off += offsetof(struct sk_buff, cb); | |
7406 | off += offsetof(struct tcp_skb_cb, bpf.data_end); | |
7407 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
7408 | si->src_reg, off); | |
7409 | break; | |
7410 | default: | |
7411 | return bpf_convert_ctx_access(type, si, insn_buf, prog, | |
7412 | target_size); | |
7413 | } | |
7414 | ||
7415 | return insn - insn_buf; | |
7416 | } | |
7417 | ||
4f738adb JF |
7418 | static u32 sk_msg_convert_ctx_access(enum bpf_access_type type, |
7419 | const struct bpf_insn *si, | |
7420 | struct bpf_insn *insn_buf, | |
7421 | struct bpf_prog *prog, u32 *target_size) | |
7422 | { | |
7423 | struct bpf_insn *insn = insn_buf; | |
720e7f38 | 7424 | #if IS_ENABLED(CONFIG_IPV6) |
303def35 | 7425 | int off; |
720e7f38 | 7426 | #endif |
4f738adb | 7427 | |
7a69c0f2 JF |
7428 | /* convert ctx uses the fact sg element is first in struct */ |
7429 | BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0); | |
7430 | ||
4f738adb JF |
7431 | switch (si->off) { |
7432 | case offsetof(struct sk_msg_md, data): | |
604326b4 | 7433 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data), |
4f738adb | 7434 | si->dst_reg, si->src_reg, |
604326b4 | 7435 | offsetof(struct sk_msg, data)); |
4f738adb JF |
7436 | break; |
7437 | case offsetof(struct sk_msg_md, data_end): | |
604326b4 | 7438 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end), |
4f738adb | 7439 | si->dst_reg, si->src_reg, |
604326b4 | 7440 | offsetof(struct sk_msg, data_end)); |
4f738adb | 7441 | break; |
303def35 JF |
7442 | case offsetof(struct sk_msg_md, family): |
7443 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); | |
7444 | ||
7445 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
604326b4 | 7446 | struct sk_msg, sk), |
303def35 | 7447 | si->dst_reg, si->src_reg, |
604326b4 | 7448 | offsetof(struct sk_msg, sk)); |
303def35 JF |
7449 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
7450 | offsetof(struct sock_common, skc_family)); | |
7451 | break; | |
7452 | ||
7453 | case offsetof(struct sk_msg_md, remote_ip4): | |
7454 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); | |
7455 | ||
7456 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
604326b4 | 7457 | struct sk_msg, sk), |
303def35 | 7458 | si->dst_reg, si->src_reg, |
604326b4 | 7459 | offsetof(struct sk_msg, sk)); |
303def35 JF |
7460 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
7461 | offsetof(struct sock_common, skc_daddr)); | |
7462 | break; | |
7463 | ||
7464 | case offsetof(struct sk_msg_md, local_ip4): | |
7465 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
7466 | skc_rcv_saddr) != 4); | |
7467 | ||
7468 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
604326b4 | 7469 | struct sk_msg, sk), |
303def35 | 7470 | si->dst_reg, si->src_reg, |
604326b4 | 7471 | offsetof(struct sk_msg, sk)); |
303def35 JF |
7472 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
7473 | offsetof(struct sock_common, | |
7474 | skc_rcv_saddr)); | |
7475 | break; | |
7476 | ||
7477 | case offsetof(struct sk_msg_md, remote_ip6[0]) ... | |
7478 | offsetof(struct sk_msg_md, remote_ip6[3]): | |
7479 | #if IS_ENABLED(CONFIG_IPV6) | |
7480 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
7481 | skc_v6_daddr.s6_addr32[0]) != 4); | |
7482 | ||
7483 | off = si->off; | |
7484 | off -= offsetof(struct sk_msg_md, remote_ip6[0]); | |
7485 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
604326b4 | 7486 | struct sk_msg, sk), |
303def35 | 7487 | si->dst_reg, si->src_reg, |
604326b4 | 7488 | offsetof(struct sk_msg, sk)); |
303def35 JF |
7489 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
7490 | offsetof(struct sock_common, | |
7491 | skc_v6_daddr.s6_addr32[0]) + | |
7492 | off); | |
7493 | #else | |
7494 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
7495 | #endif | |
7496 | break; | |
7497 | ||
7498 | case offsetof(struct sk_msg_md, local_ip6[0]) ... | |
7499 | offsetof(struct sk_msg_md, local_ip6[3]): | |
7500 | #if IS_ENABLED(CONFIG_IPV6) | |
7501 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
7502 | skc_v6_rcv_saddr.s6_addr32[0]) != 4); | |
7503 | ||
7504 | off = si->off; | |
7505 | off -= offsetof(struct sk_msg_md, local_ip6[0]); | |
7506 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
604326b4 | 7507 | struct sk_msg, sk), |
303def35 | 7508 | si->dst_reg, si->src_reg, |
604326b4 | 7509 | offsetof(struct sk_msg, sk)); |
303def35 JF |
7510 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
7511 | offsetof(struct sock_common, | |
7512 | skc_v6_rcv_saddr.s6_addr32[0]) + | |
7513 | off); | |
7514 | #else | |
7515 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
7516 | #endif | |
7517 | break; | |
7518 | ||
7519 | case offsetof(struct sk_msg_md, remote_port): | |
7520 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); | |
7521 | ||
7522 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
604326b4 | 7523 | struct sk_msg, sk), |
303def35 | 7524 | si->dst_reg, si->src_reg, |
604326b4 | 7525 | offsetof(struct sk_msg, sk)); |
303def35 JF |
7526 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
7527 | offsetof(struct sock_common, skc_dport)); | |
7528 | #ifndef __BIG_ENDIAN_BITFIELD | |
7529 | *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); | |
7530 | #endif | |
7531 | break; | |
7532 | ||
7533 | case offsetof(struct sk_msg_md, local_port): | |
7534 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); | |
7535 | ||
7536 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
604326b4 | 7537 | struct sk_msg, sk), |
303def35 | 7538 | si->dst_reg, si->src_reg, |
604326b4 | 7539 | offsetof(struct sk_msg, sk)); |
303def35 JF |
7540 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
7541 | offsetof(struct sock_common, skc_num)); | |
7542 | break; | |
3bdbd022 JF |
7543 | |
7544 | case offsetof(struct sk_msg_md, size): | |
7545 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size), | |
7546 | si->dst_reg, si->src_reg, | |
7547 | offsetof(struct sk_msg_sg, size)); | |
7548 | break; | |
4f738adb JF |
7549 | } |
7550 | ||
7551 | return insn - insn_buf; | |
7552 | } | |
7553 | ||
7de16e3a | 7554 | const struct bpf_verifier_ops sk_filter_verifier_ops = { |
4936e352 DB |
7555 | .get_func_proto = sk_filter_func_proto, |
7556 | .is_valid_access = sk_filter_is_valid_access, | |
2492d3b8 | 7557 | .convert_ctx_access = bpf_convert_ctx_access, |
e0cea7ce | 7558 | .gen_ld_abs = bpf_gen_ld_abs, |
89aa0758 AS |
7559 | }; |
7560 | ||
7de16e3a | 7561 | const struct bpf_prog_ops sk_filter_prog_ops = { |
61f3c964 | 7562 | .test_run = bpf_prog_test_run_skb, |
7de16e3a JK |
7563 | }; |
7564 | ||
7565 | const struct bpf_verifier_ops tc_cls_act_verifier_ops = { | |
4936e352 DB |
7566 | .get_func_proto = tc_cls_act_func_proto, |
7567 | .is_valid_access = tc_cls_act_is_valid_access, | |
374fb54e | 7568 | .convert_ctx_access = tc_cls_act_convert_ctx_access, |
36bbef52 | 7569 | .gen_prologue = tc_cls_act_prologue, |
e0cea7ce | 7570 | .gen_ld_abs = bpf_gen_ld_abs, |
7de16e3a JK |
7571 | }; |
7572 | ||
7573 | const struct bpf_prog_ops tc_cls_act_prog_ops = { | |
1cf1cae9 | 7574 | .test_run = bpf_prog_test_run_skb, |
608cd71a AS |
7575 | }; |
7576 | ||
7de16e3a | 7577 | const struct bpf_verifier_ops xdp_verifier_ops = { |
6a773a15 BB |
7578 | .get_func_proto = xdp_func_proto, |
7579 | .is_valid_access = xdp_is_valid_access, | |
7580 | .convert_ctx_access = xdp_convert_ctx_access, | |
b09928b9 | 7581 | .gen_prologue = bpf_noop_prologue, |
7de16e3a JK |
7582 | }; |
7583 | ||
7584 | const struct bpf_prog_ops xdp_prog_ops = { | |
1cf1cae9 | 7585 | .test_run = bpf_prog_test_run_xdp, |
6a773a15 BB |
7586 | }; |
7587 | ||
7de16e3a | 7588 | const struct bpf_verifier_ops cg_skb_verifier_ops = { |
cd339431 | 7589 | .get_func_proto = cg_skb_func_proto, |
b39b5f41 | 7590 | .is_valid_access = cg_skb_is_valid_access, |
2492d3b8 | 7591 | .convert_ctx_access = bpf_convert_ctx_access, |
7de16e3a JK |
7592 | }; |
7593 | ||
7594 | const struct bpf_prog_ops cg_skb_prog_ops = { | |
1cf1cae9 | 7595 | .test_run = bpf_prog_test_run_skb, |
0e33661d DM |
7596 | }; |
7597 | ||
cd3092c7 MX |
7598 | const struct bpf_verifier_ops lwt_in_verifier_ops = { |
7599 | .get_func_proto = lwt_in_func_proto, | |
3a0af8fd | 7600 | .is_valid_access = lwt_is_valid_access, |
2492d3b8 | 7601 | .convert_ctx_access = bpf_convert_ctx_access, |
7de16e3a JK |
7602 | }; |
7603 | ||
cd3092c7 MX |
7604 | const struct bpf_prog_ops lwt_in_prog_ops = { |
7605 | .test_run = bpf_prog_test_run_skb, | |
7606 | }; | |
7607 | ||
7608 | const struct bpf_verifier_ops lwt_out_verifier_ops = { | |
7609 | .get_func_proto = lwt_out_func_proto, | |
3a0af8fd | 7610 | .is_valid_access = lwt_is_valid_access, |
2492d3b8 | 7611 | .convert_ctx_access = bpf_convert_ctx_access, |
7de16e3a JK |
7612 | }; |
7613 | ||
cd3092c7 | 7614 | const struct bpf_prog_ops lwt_out_prog_ops = { |
1cf1cae9 | 7615 | .test_run = bpf_prog_test_run_skb, |
3a0af8fd TG |
7616 | }; |
7617 | ||
7de16e3a | 7618 | const struct bpf_verifier_ops lwt_xmit_verifier_ops = { |
3a0af8fd TG |
7619 | .get_func_proto = lwt_xmit_func_proto, |
7620 | .is_valid_access = lwt_is_valid_access, | |
2492d3b8 | 7621 | .convert_ctx_access = bpf_convert_ctx_access, |
3a0af8fd | 7622 | .gen_prologue = tc_cls_act_prologue, |
7de16e3a JK |
7623 | }; |
7624 | ||
7625 | const struct bpf_prog_ops lwt_xmit_prog_ops = { | |
1cf1cae9 | 7626 | .test_run = bpf_prog_test_run_skb, |
3a0af8fd TG |
7627 | }; |
7628 | ||
004d4b27 MX |
7629 | const struct bpf_verifier_ops lwt_seg6local_verifier_ops = { |
7630 | .get_func_proto = lwt_seg6local_func_proto, | |
7631 | .is_valid_access = lwt_is_valid_access, | |
7632 | .convert_ctx_access = bpf_convert_ctx_access, | |
7633 | }; | |
7634 | ||
7635 | const struct bpf_prog_ops lwt_seg6local_prog_ops = { | |
7636 | .test_run = bpf_prog_test_run_skb, | |
7637 | }; | |
7638 | ||
7de16e3a | 7639 | const struct bpf_verifier_ops cg_sock_verifier_ops = { |
ae2cf1c4 | 7640 | .get_func_proto = sock_filter_func_proto, |
61023658 | 7641 | .is_valid_access = sock_filter_is_valid_access, |
c64b7983 | 7642 | .convert_ctx_access = bpf_sock_convert_ctx_access, |
61023658 DA |
7643 | }; |
7644 | ||
7de16e3a JK |
7645 | const struct bpf_prog_ops cg_sock_prog_ops = { |
7646 | }; | |
7647 | ||
4fbac77d AI |
7648 | const struct bpf_verifier_ops cg_sock_addr_verifier_ops = { |
7649 | .get_func_proto = sock_addr_func_proto, | |
7650 | .is_valid_access = sock_addr_is_valid_access, | |
7651 | .convert_ctx_access = sock_addr_convert_ctx_access, | |
7652 | }; | |
7653 | ||
7654 | const struct bpf_prog_ops cg_sock_addr_prog_ops = { | |
7655 | }; | |
7656 | ||
7de16e3a | 7657 | const struct bpf_verifier_ops sock_ops_verifier_ops = { |
8c4b4c7e | 7658 | .get_func_proto = sock_ops_func_proto, |
40304b2a LB |
7659 | .is_valid_access = sock_ops_is_valid_access, |
7660 | .convert_ctx_access = sock_ops_convert_ctx_access, | |
7661 | }; | |
7662 | ||
7de16e3a JK |
7663 | const struct bpf_prog_ops sock_ops_prog_ops = { |
7664 | }; | |
7665 | ||
7666 | const struct bpf_verifier_ops sk_skb_verifier_ops = { | |
b005fd18 JF |
7667 | .get_func_proto = sk_skb_func_proto, |
7668 | .is_valid_access = sk_skb_is_valid_access, | |
8108a775 | 7669 | .convert_ctx_access = sk_skb_convert_ctx_access, |
8a31db56 | 7670 | .gen_prologue = sk_skb_prologue, |
b005fd18 JF |
7671 | }; |
7672 | ||
7de16e3a JK |
7673 | const struct bpf_prog_ops sk_skb_prog_ops = { |
7674 | }; | |
7675 | ||
4f738adb JF |
7676 | const struct bpf_verifier_ops sk_msg_verifier_ops = { |
7677 | .get_func_proto = sk_msg_func_proto, | |
7678 | .is_valid_access = sk_msg_is_valid_access, | |
7679 | .convert_ctx_access = sk_msg_convert_ctx_access, | |
b09928b9 | 7680 | .gen_prologue = bpf_noop_prologue, |
4f738adb JF |
7681 | }; |
7682 | ||
7683 | const struct bpf_prog_ops sk_msg_prog_ops = { | |
7684 | }; | |
7685 | ||
d58e468b PP |
7686 | const struct bpf_verifier_ops flow_dissector_verifier_ops = { |
7687 | .get_func_proto = flow_dissector_func_proto, | |
7688 | .is_valid_access = flow_dissector_is_valid_access, | |
7689 | .convert_ctx_access = bpf_convert_ctx_access, | |
7690 | }; | |
7691 | ||
7692 | const struct bpf_prog_ops flow_dissector_prog_ops = { | |
7693 | }; | |
7694 | ||
8ced425e | 7695 | int sk_detach_filter(struct sock *sk) |
55b33325 PE |
7696 | { |
7697 | int ret = -ENOENT; | |
7698 | struct sk_filter *filter; | |
7699 | ||
d59577b6 VB |
7700 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
7701 | return -EPERM; | |
7702 | ||
8ced425e HFS |
7703 | filter = rcu_dereference_protected(sk->sk_filter, |
7704 | lockdep_sock_is_held(sk)); | |
55b33325 | 7705 | if (filter) { |
a9b3cd7f | 7706 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
46bcf14f | 7707 | sk_filter_uncharge(sk, filter); |
55b33325 PE |
7708 | ret = 0; |
7709 | } | |
a3ea269b | 7710 | |
55b33325 PE |
7711 | return ret; |
7712 | } | |
8ced425e | 7713 | EXPORT_SYMBOL_GPL(sk_detach_filter); |
a8fc9277 | 7714 | |
a3ea269b DB |
7715 | int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf, |
7716 | unsigned int len) | |
a8fc9277 | 7717 | { |
a3ea269b | 7718 | struct sock_fprog_kern *fprog; |
a8fc9277 | 7719 | struct sk_filter *filter; |
a3ea269b | 7720 | int ret = 0; |
a8fc9277 PE |
7721 | |
7722 | lock_sock(sk); | |
7723 | filter = rcu_dereference_protected(sk->sk_filter, | |
8ced425e | 7724 | lockdep_sock_is_held(sk)); |
a8fc9277 PE |
7725 | if (!filter) |
7726 | goto out; | |
a3ea269b DB |
7727 | |
7728 | /* We're copying the filter that has been originally attached, | |
93d08b69 DB |
7729 | * so no conversion/decode needed anymore. eBPF programs that |
7730 | * have no original program cannot be dumped through this. | |
a3ea269b | 7731 | */ |
93d08b69 | 7732 | ret = -EACCES; |
7ae457c1 | 7733 | fprog = filter->prog->orig_prog; |
93d08b69 DB |
7734 | if (!fprog) |
7735 | goto out; | |
a3ea269b DB |
7736 | |
7737 | ret = fprog->len; | |
a8fc9277 | 7738 | if (!len) |
a3ea269b | 7739 | /* User space only enquires number of filter blocks. */ |
a8fc9277 | 7740 | goto out; |
a3ea269b | 7741 | |
a8fc9277 | 7742 | ret = -EINVAL; |
a3ea269b | 7743 | if (len < fprog->len) |
a8fc9277 PE |
7744 | goto out; |
7745 | ||
7746 | ret = -EFAULT; | |
009937e7 | 7747 | if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog))) |
a3ea269b | 7748 | goto out; |
a8fc9277 | 7749 | |
a3ea269b DB |
7750 | /* Instead of bytes, the API requests to return the number |
7751 | * of filter blocks. | |
7752 | */ | |
7753 | ret = fprog->len; | |
a8fc9277 PE |
7754 | out: |
7755 | release_sock(sk); | |
7756 | return ret; | |
7757 | } | |
2dbb9b9e MKL |
7758 | |
7759 | #ifdef CONFIG_INET | |
7760 | struct sk_reuseport_kern { | |
7761 | struct sk_buff *skb; | |
7762 | struct sock *sk; | |
7763 | struct sock *selected_sk; | |
7764 | void *data_end; | |
7765 | u32 hash; | |
7766 | u32 reuseport_id; | |
7767 | bool bind_inany; | |
7768 | }; | |
7769 | ||
7770 | static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern, | |
7771 | struct sock_reuseport *reuse, | |
7772 | struct sock *sk, struct sk_buff *skb, | |
7773 | u32 hash) | |
7774 | { | |
7775 | reuse_kern->skb = skb; | |
7776 | reuse_kern->sk = sk; | |
7777 | reuse_kern->selected_sk = NULL; | |
7778 | reuse_kern->data_end = skb->data + skb_headlen(skb); | |
7779 | reuse_kern->hash = hash; | |
7780 | reuse_kern->reuseport_id = reuse->reuseport_id; | |
7781 | reuse_kern->bind_inany = reuse->bind_inany; | |
7782 | } | |
7783 | ||
7784 | struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk, | |
7785 | struct bpf_prog *prog, struct sk_buff *skb, | |
7786 | u32 hash) | |
7787 | { | |
7788 | struct sk_reuseport_kern reuse_kern; | |
7789 | enum sk_action action; | |
7790 | ||
7791 | bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, hash); | |
7792 | action = BPF_PROG_RUN(prog, &reuse_kern); | |
7793 | ||
7794 | if (action == SK_PASS) | |
7795 | return reuse_kern.selected_sk; | |
7796 | else | |
7797 | return ERR_PTR(-ECONNREFUSED); | |
7798 | } | |
7799 | ||
7800 | BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern, | |
7801 | struct bpf_map *, map, void *, key, u32, flags) | |
7802 | { | |
7803 | struct sock_reuseport *reuse; | |
7804 | struct sock *selected_sk; | |
7805 | ||
7806 | selected_sk = map->ops->map_lookup_elem(map, key); | |
7807 | if (!selected_sk) | |
7808 | return -ENOENT; | |
7809 | ||
7810 | reuse = rcu_dereference(selected_sk->sk_reuseport_cb); | |
7811 | if (!reuse) | |
7812 | /* selected_sk is unhashed (e.g. by close()) after the | |
7813 | * above map_lookup_elem(). Treat selected_sk has already | |
7814 | * been removed from the map. | |
7815 | */ | |
7816 | return -ENOENT; | |
7817 | ||
7818 | if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) { | |
7819 | struct sock *sk; | |
7820 | ||
7821 | if (unlikely(!reuse_kern->reuseport_id)) | |
7822 | /* There is a small race between adding the | |
7823 | * sk to the map and setting the | |
7824 | * reuse_kern->reuseport_id. | |
7825 | * Treat it as the sk has not been added to | |
7826 | * the bpf map yet. | |
7827 | */ | |
7828 | return -ENOENT; | |
7829 | ||
7830 | sk = reuse_kern->sk; | |
7831 | if (sk->sk_protocol != selected_sk->sk_protocol) | |
7832 | return -EPROTOTYPE; | |
7833 | else if (sk->sk_family != selected_sk->sk_family) | |
7834 | return -EAFNOSUPPORT; | |
7835 | ||
7836 | /* Catch all. Likely bound to a different sockaddr. */ | |
7837 | return -EBADFD; | |
7838 | } | |
7839 | ||
7840 | reuse_kern->selected_sk = selected_sk; | |
7841 | ||
7842 | return 0; | |
7843 | } | |
7844 | ||
7845 | static const struct bpf_func_proto sk_select_reuseport_proto = { | |
7846 | .func = sk_select_reuseport, | |
7847 | .gpl_only = false, | |
7848 | .ret_type = RET_INTEGER, | |
7849 | .arg1_type = ARG_PTR_TO_CTX, | |
7850 | .arg2_type = ARG_CONST_MAP_PTR, | |
7851 | .arg3_type = ARG_PTR_TO_MAP_KEY, | |
7852 | .arg4_type = ARG_ANYTHING, | |
7853 | }; | |
7854 | ||
7855 | BPF_CALL_4(sk_reuseport_load_bytes, | |
7856 | const struct sk_reuseport_kern *, reuse_kern, u32, offset, | |
7857 | void *, to, u32, len) | |
7858 | { | |
7859 | return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len); | |
7860 | } | |
7861 | ||
7862 | static const struct bpf_func_proto sk_reuseport_load_bytes_proto = { | |
7863 | .func = sk_reuseport_load_bytes, | |
7864 | .gpl_only = false, | |
7865 | .ret_type = RET_INTEGER, | |
7866 | .arg1_type = ARG_PTR_TO_CTX, | |
7867 | .arg2_type = ARG_ANYTHING, | |
7868 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, | |
7869 | .arg4_type = ARG_CONST_SIZE, | |
7870 | }; | |
7871 | ||
7872 | BPF_CALL_5(sk_reuseport_load_bytes_relative, | |
7873 | const struct sk_reuseport_kern *, reuse_kern, u32, offset, | |
7874 | void *, to, u32, len, u32, start_header) | |
7875 | { | |
7876 | return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to, | |
7877 | len, start_header); | |
7878 | } | |
7879 | ||
7880 | static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = { | |
7881 | .func = sk_reuseport_load_bytes_relative, | |
7882 | .gpl_only = false, | |
7883 | .ret_type = RET_INTEGER, | |
7884 | .arg1_type = ARG_PTR_TO_CTX, | |
7885 | .arg2_type = ARG_ANYTHING, | |
7886 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, | |
7887 | .arg4_type = ARG_CONST_SIZE, | |
7888 | .arg5_type = ARG_ANYTHING, | |
7889 | }; | |
7890 | ||
7891 | static const struct bpf_func_proto * | |
7892 | sk_reuseport_func_proto(enum bpf_func_id func_id, | |
7893 | const struct bpf_prog *prog) | |
7894 | { | |
7895 | switch (func_id) { | |
7896 | case BPF_FUNC_sk_select_reuseport: | |
7897 | return &sk_select_reuseport_proto; | |
7898 | case BPF_FUNC_skb_load_bytes: | |
7899 | return &sk_reuseport_load_bytes_proto; | |
7900 | case BPF_FUNC_skb_load_bytes_relative: | |
7901 | return &sk_reuseport_load_bytes_relative_proto; | |
7902 | default: | |
7903 | return bpf_base_func_proto(func_id); | |
7904 | } | |
7905 | } | |
7906 | ||
7907 | static bool | |
7908 | sk_reuseport_is_valid_access(int off, int size, | |
7909 | enum bpf_access_type type, | |
7910 | const struct bpf_prog *prog, | |
7911 | struct bpf_insn_access_aux *info) | |
7912 | { | |
7913 | const u32 size_default = sizeof(__u32); | |
7914 | ||
7915 | if (off < 0 || off >= sizeof(struct sk_reuseport_md) || | |
7916 | off % size || type != BPF_READ) | |
7917 | return false; | |
7918 | ||
7919 | switch (off) { | |
7920 | case offsetof(struct sk_reuseport_md, data): | |
7921 | info->reg_type = PTR_TO_PACKET; | |
7922 | return size == sizeof(__u64); | |
7923 | ||
7924 | case offsetof(struct sk_reuseport_md, data_end): | |
7925 | info->reg_type = PTR_TO_PACKET_END; | |
7926 | return size == sizeof(__u64); | |
7927 | ||
7928 | case offsetof(struct sk_reuseport_md, hash): | |
7929 | return size == size_default; | |
7930 | ||
7931 | /* Fields that allow narrowing */ | |
7932 | case offsetof(struct sk_reuseport_md, eth_protocol): | |
7933 | if (size < FIELD_SIZEOF(struct sk_buff, protocol)) | |
7934 | return false; | |
4597b62f | 7935 | /* fall through */ |
2dbb9b9e MKL |
7936 | case offsetof(struct sk_reuseport_md, ip_protocol): |
7937 | case offsetof(struct sk_reuseport_md, bind_inany): | |
7938 | case offsetof(struct sk_reuseport_md, len): | |
7939 | bpf_ctx_record_field_size(info, size_default); | |
7940 | return bpf_ctx_narrow_access_ok(off, size, size_default); | |
7941 | ||
7942 | default: | |
7943 | return false; | |
7944 | } | |
7945 | } | |
7946 | ||
7947 | #define SK_REUSEPORT_LOAD_FIELD(F) ({ \ | |
7948 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \ | |
7949 | si->dst_reg, si->src_reg, \ | |
7950 | bpf_target_off(struct sk_reuseport_kern, F, \ | |
7951 | FIELD_SIZEOF(struct sk_reuseport_kern, F), \ | |
7952 | target_size)); \ | |
7953 | }) | |
7954 | ||
7955 | #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \ | |
7956 | SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ | |
7957 | struct sk_buff, \ | |
7958 | skb, \ | |
7959 | SKB_FIELD) | |
7960 | ||
7961 | #define SK_REUSEPORT_LOAD_SK_FIELD_SIZE_OFF(SK_FIELD, BPF_SIZE, EXTRA_OFF) \ | |
7962 | SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(struct sk_reuseport_kern, \ | |
7963 | struct sock, \ | |
7964 | sk, \ | |
7965 | SK_FIELD, BPF_SIZE, EXTRA_OFF) | |
7966 | ||
7967 | static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type, | |
7968 | const struct bpf_insn *si, | |
7969 | struct bpf_insn *insn_buf, | |
7970 | struct bpf_prog *prog, | |
7971 | u32 *target_size) | |
7972 | { | |
7973 | struct bpf_insn *insn = insn_buf; | |
7974 | ||
7975 | switch (si->off) { | |
7976 | case offsetof(struct sk_reuseport_md, data): | |
7977 | SK_REUSEPORT_LOAD_SKB_FIELD(data); | |
7978 | break; | |
7979 | ||
7980 | case offsetof(struct sk_reuseport_md, len): | |
7981 | SK_REUSEPORT_LOAD_SKB_FIELD(len); | |
7982 | break; | |
7983 | ||
7984 | case offsetof(struct sk_reuseport_md, eth_protocol): | |
7985 | SK_REUSEPORT_LOAD_SKB_FIELD(protocol); | |
7986 | break; | |
7987 | ||
7988 | case offsetof(struct sk_reuseport_md, ip_protocol): | |
3f6e138d | 7989 | BUILD_BUG_ON(HWEIGHT32(SK_FL_PROTO_MASK) != BITS_PER_BYTE); |
2dbb9b9e MKL |
7990 | SK_REUSEPORT_LOAD_SK_FIELD_SIZE_OFF(__sk_flags_offset, |
7991 | BPF_W, 0); | |
7992 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK); | |
7993 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, | |
7994 | SK_FL_PROTO_SHIFT); | |
7995 | /* SK_FL_PROTO_MASK and SK_FL_PROTO_SHIFT are endian | |
7996 | * aware. No further narrowing or masking is needed. | |
7997 | */ | |
7998 | *target_size = 1; | |
7999 | break; | |
8000 | ||
8001 | case offsetof(struct sk_reuseport_md, data_end): | |
8002 | SK_REUSEPORT_LOAD_FIELD(data_end); | |
8003 | break; | |
8004 | ||
8005 | case offsetof(struct sk_reuseport_md, hash): | |
8006 | SK_REUSEPORT_LOAD_FIELD(hash); | |
8007 | break; | |
8008 | ||
8009 | case offsetof(struct sk_reuseport_md, bind_inany): | |
8010 | SK_REUSEPORT_LOAD_FIELD(bind_inany); | |
8011 | break; | |
8012 | } | |
8013 | ||
8014 | return insn - insn_buf; | |
8015 | } | |
8016 | ||
8017 | const struct bpf_verifier_ops sk_reuseport_verifier_ops = { | |
8018 | .get_func_proto = sk_reuseport_func_proto, | |
8019 | .is_valid_access = sk_reuseport_is_valid_access, | |
8020 | .convert_ctx_access = sk_reuseport_convert_ctx_access, | |
8021 | }; | |
8022 | ||
8023 | const struct bpf_prog_ops sk_reuseport_prog_ops = { | |
8024 | }; | |
8025 | #endif /* CONFIG_INET */ |