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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> |
1da177e4 LT |
36 | #include <net/ip.h> |
37 | #include <net/protocol.h> | |
4738c1db | 38 | #include <net/netlink.h> |
1da177e4 LT |
39 | #include <linux/skbuff.h> |
40 | #include <net/sock.h> | |
10b89ee4 | 41 | #include <net/flow_dissector.h> |
1da177e4 LT |
42 | #include <linux/errno.h> |
43 | #include <linux/timer.h> | |
7c0f6ba6 | 44 | #include <linux/uaccess.h> |
40daafc8 | 45 | #include <asm/unaligned.h> |
d66f2b91 | 46 | #include <asm/cmpxchg.h> |
1da177e4 | 47 | #include <linux/filter.h> |
86e4ca66 | 48 | #include <linux/ratelimit.h> |
46b325c7 | 49 | #include <linux/seccomp.h> |
f3335031 | 50 | #include <linux/if_vlan.h> |
89aa0758 | 51 | #include <linux/bpf.h> |
d691f9e8 | 52 | #include <net/sch_generic.h> |
8d20aabe | 53 | #include <net/cls_cgroup.h> |
d3aa45ce | 54 | #include <net/dst_metadata.h> |
c46646d0 | 55 | #include <net/dst.h> |
538950a1 | 56 | #include <net/sock_reuseport.h> |
b1d9fc41 | 57 | #include <net/busy_poll.h> |
8c4b4c7e | 58 | #include <net/tcp.h> |
5acaee0a | 59 | #include <linux/bpf_trace.h> |
1da177e4 | 60 | |
43db6d65 | 61 | /** |
f4979fce | 62 | * sk_filter_trim_cap - run a packet through a socket filter |
43db6d65 SH |
63 | * @sk: sock associated with &sk_buff |
64 | * @skb: buffer to filter | |
f4979fce | 65 | * @cap: limit on how short the eBPF program may trim the packet |
43db6d65 | 66 | * |
ff936a04 AS |
67 | * Run the eBPF program and then cut skb->data to correct size returned by |
68 | * the program. If pkt_len is 0 we toss packet. If skb->len is smaller | |
43db6d65 | 69 | * than pkt_len we keep whole skb->data. This is the socket level |
ff936a04 | 70 | * wrapper to BPF_PROG_RUN. It returns 0 if the packet should |
43db6d65 SH |
71 | * be accepted or -EPERM if the packet should be tossed. |
72 | * | |
73 | */ | |
f4979fce | 74 | int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) |
43db6d65 SH |
75 | { |
76 | int err; | |
77 | struct sk_filter *filter; | |
78 | ||
c93bdd0e MG |
79 | /* |
80 | * If the skb was allocated from pfmemalloc reserves, only | |
81 | * allow SOCK_MEMALLOC sockets to use it as this socket is | |
82 | * helping free memory | |
83 | */ | |
8fe809a9 ED |
84 | if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) { |
85 | NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP); | |
c93bdd0e | 86 | return -ENOMEM; |
8fe809a9 | 87 | } |
c11cd3a6 DM |
88 | err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); |
89 | if (err) | |
90 | return err; | |
91 | ||
43db6d65 SH |
92 | err = security_sock_rcv_skb(sk, skb); |
93 | if (err) | |
94 | return err; | |
95 | ||
80f8f102 ED |
96 | rcu_read_lock(); |
97 | filter = rcu_dereference(sk->sk_filter); | |
43db6d65 | 98 | if (filter) { |
8f917bba WB |
99 | struct sock *save_sk = skb->sk; |
100 | unsigned int pkt_len; | |
101 | ||
102 | skb->sk = sk; | |
103 | pkt_len = bpf_prog_run_save_cb(filter->prog, skb); | |
8f917bba | 104 | skb->sk = save_sk; |
d1f496fd | 105 | err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM; |
43db6d65 | 106 | } |
80f8f102 | 107 | rcu_read_unlock(); |
43db6d65 SH |
108 | |
109 | return err; | |
110 | } | |
f4979fce | 111 | EXPORT_SYMBOL(sk_filter_trim_cap); |
43db6d65 | 112 | |
f3694e00 | 113 | BPF_CALL_1(__skb_get_pay_offset, struct sk_buff *, skb) |
bd4cf0ed | 114 | { |
f3694e00 | 115 | return skb_get_poff(skb); |
bd4cf0ed AS |
116 | } |
117 | ||
f3694e00 | 118 | BPF_CALL_3(__skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x) |
bd4cf0ed | 119 | { |
bd4cf0ed AS |
120 | struct nlattr *nla; |
121 | ||
122 | if (skb_is_nonlinear(skb)) | |
123 | return 0; | |
124 | ||
05ab8f26 MK |
125 | if (skb->len < sizeof(struct nlattr)) |
126 | return 0; | |
127 | ||
30743837 | 128 | if (a > skb->len - sizeof(struct nlattr)) |
bd4cf0ed AS |
129 | return 0; |
130 | ||
30743837 | 131 | nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x); |
bd4cf0ed AS |
132 | if (nla) |
133 | return (void *) nla - (void *) skb->data; | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
f3694e00 | 138 | BPF_CALL_3(__skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x) |
bd4cf0ed | 139 | { |
bd4cf0ed AS |
140 | struct nlattr *nla; |
141 | ||
142 | if (skb_is_nonlinear(skb)) | |
143 | return 0; | |
144 | ||
05ab8f26 MK |
145 | if (skb->len < sizeof(struct nlattr)) |
146 | return 0; | |
147 | ||
30743837 | 148 | if (a > skb->len - sizeof(struct nlattr)) |
bd4cf0ed AS |
149 | return 0; |
150 | ||
30743837 DB |
151 | nla = (struct nlattr *) &skb->data[a]; |
152 | if (nla->nla_len > skb->len - a) | |
bd4cf0ed AS |
153 | return 0; |
154 | ||
30743837 | 155 | nla = nla_find_nested(nla, x); |
bd4cf0ed AS |
156 | if (nla) |
157 | return (void *) nla - (void *) skb->data; | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
f3694e00 | 162 | BPF_CALL_0(__get_raw_cpu_id) |
bd4cf0ed AS |
163 | { |
164 | return raw_smp_processor_id(); | |
165 | } | |
166 | ||
80b48c44 DB |
167 | static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = { |
168 | .func = __get_raw_cpu_id, | |
169 | .gpl_only = false, | |
170 | .ret_type = RET_INTEGER, | |
171 | }; | |
172 | ||
9bac3d6d AS |
173 | static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg, |
174 | struct bpf_insn *insn_buf) | |
175 | { | |
176 | struct bpf_insn *insn = insn_buf; | |
177 | ||
178 | switch (skb_field) { | |
179 | case SKF_AD_MARK: | |
180 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, mark) != 4); | |
181 | ||
182 | *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, | |
183 | offsetof(struct sk_buff, mark)); | |
184 | break; | |
185 | ||
186 | case SKF_AD_PKTTYPE: | |
187 | *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET()); | |
188 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX); | |
189 | #ifdef __BIG_ENDIAN_BITFIELD | |
190 | *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5); | |
191 | #endif | |
192 | break; | |
193 | ||
194 | case SKF_AD_QUEUE: | |
195 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, queue_mapping) != 2); | |
196 | ||
197 | *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, | |
198 | offsetof(struct sk_buff, queue_mapping)); | |
199 | break; | |
c2497395 | 200 | |
c2497395 AS |
201 | case SKF_AD_VLAN_TAG: |
202 | case SKF_AD_VLAN_TAG_PRESENT: | |
203 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2); | |
204 | BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000); | |
205 | ||
206 | /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */ | |
207 | *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, | |
208 | offsetof(struct sk_buff, vlan_tci)); | |
209 | if (skb_field == SKF_AD_VLAN_TAG) { | |
210 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, | |
211 | ~VLAN_TAG_PRESENT); | |
212 | } else { | |
213 | /* dst_reg >>= 12 */ | |
214 | *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 12); | |
215 | /* dst_reg &= 1 */ | |
216 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1); | |
217 | } | |
218 | break; | |
9bac3d6d AS |
219 | } |
220 | ||
221 | return insn - insn_buf; | |
222 | } | |
223 | ||
bd4cf0ed | 224 | static bool convert_bpf_extensions(struct sock_filter *fp, |
2695fb55 | 225 | struct bpf_insn **insnp) |
bd4cf0ed | 226 | { |
2695fb55 | 227 | struct bpf_insn *insn = *insnp; |
9bac3d6d | 228 | u32 cnt; |
bd4cf0ed AS |
229 | |
230 | switch (fp->k) { | |
231 | case SKF_AD_OFF + SKF_AD_PROTOCOL: | |
0b8c707d DB |
232 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, protocol) != 2); |
233 | ||
234 | /* A = *(u16 *) (CTX + offsetof(protocol)) */ | |
235 | *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, | |
236 | offsetof(struct sk_buff, protocol)); | |
237 | /* A = ntohs(A) [emitting a nop or swap16] */ | |
238 | *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); | |
bd4cf0ed AS |
239 | break; |
240 | ||
241 | case SKF_AD_OFF + SKF_AD_PKTTYPE: | |
9bac3d6d AS |
242 | cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn); |
243 | insn += cnt - 1; | |
bd4cf0ed AS |
244 | break; |
245 | ||
246 | case SKF_AD_OFF + SKF_AD_IFINDEX: | |
247 | case SKF_AD_OFF + SKF_AD_HATYPE: | |
bd4cf0ed AS |
248 | BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, ifindex) != 4); |
249 | BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, type) != 2); | |
f8f6d679 | 250 | |
f035a515 | 251 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
f8f6d679 DB |
252 | BPF_REG_TMP, BPF_REG_CTX, |
253 | offsetof(struct sk_buff, dev)); | |
254 | /* if (tmp != 0) goto pc + 1 */ | |
255 | *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1); | |
256 | *insn++ = BPF_EXIT_INSN(); | |
257 | if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX) | |
258 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP, | |
259 | offsetof(struct net_device, ifindex)); | |
260 | else | |
261 | *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP, | |
262 | offsetof(struct net_device, type)); | |
bd4cf0ed AS |
263 | break; |
264 | ||
265 | case SKF_AD_OFF + SKF_AD_MARK: | |
9bac3d6d AS |
266 | cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn); |
267 | insn += cnt - 1; | |
bd4cf0ed AS |
268 | break; |
269 | ||
270 | case SKF_AD_OFF + SKF_AD_RXHASH: | |
271 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, hash) != 4); | |
272 | ||
9739eef1 AS |
273 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, |
274 | offsetof(struct sk_buff, hash)); | |
bd4cf0ed AS |
275 | break; |
276 | ||
277 | case SKF_AD_OFF + SKF_AD_QUEUE: | |
9bac3d6d AS |
278 | cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn); |
279 | insn += cnt - 1; | |
bd4cf0ed AS |
280 | break; |
281 | ||
282 | case SKF_AD_OFF + SKF_AD_VLAN_TAG: | |
c2497395 AS |
283 | cnt = convert_skb_access(SKF_AD_VLAN_TAG, |
284 | BPF_REG_A, BPF_REG_CTX, insn); | |
285 | insn += cnt - 1; | |
286 | break; | |
bd4cf0ed | 287 | |
c2497395 AS |
288 | case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT: |
289 | cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT, | |
290 | BPF_REG_A, BPF_REG_CTX, insn); | |
291 | insn += cnt - 1; | |
bd4cf0ed AS |
292 | break; |
293 | ||
27cd5452 MS |
294 | case SKF_AD_OFF + SKF_AD_VLAN_TPID: |
295 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_proto) != 2); | |
296 | ||
297 | /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */ | |
298 | *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, | |
299 | offsetof(struct sk_buff, vlan_proto)); | |
300 | /* A = ntohs(A) [emitting a nop or swap16] */ | |
301 | *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); | |
302 | break; | |
303 | ||
bd4cf0ed AS |
304 | case SKF_AD_OFF + SKF_AD_PAY_OFFSET: |
305 | case SKF_AD_OFF + SKF_AD_NLATTR: | |
306 | case SKF_AD_OFF + SKF_AD_NLATTR_NEST: | |
307 | case SKF_AD_OFF + SKF_AD_CPU: | |
4cd3675e | 308 | case SKF_AD_OFF + SKF_AD_RANDOM: |
e430f34e | 309 | /* arg1 = CTX */ |
f8f6d679 | 310 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); |
bd4cf0ed | 311 | /* arg2 = A */ |
f8f6d679 | 312 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A); |
bd4cf0ed | 313 | /* arg3 = X */ |
f8f6d679 | 314 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X); |
e430f34e | 315 | /* Emit call(arg1=CTX, arg2=A, arg3=X) */ |
bd4cf0ed AS |
316 | switch (fp->k) { |
317 | case SKF_AD_OFF + SKF_AD_PAY_OFFSET: | |
f8f6d679 | 318 | *insn = BPF_EMIT_CALL(__skb_get_pay_offset); |
bd4cf0ed AS |
319 | break; |
320 | case SKF_AD_OFF + SKF_AD_NLATTR: | |
f8f6d679 | 321 | *insn = BPF_EMIT_CALL(__skb_get_nlattr); |
bd4cf0ed AS |
322 | break; |
323 | case SKF_AD_OFF + SKF_AD_NLATTR_NEST: | |
f8f6d679 | 324 | *insn = BPF_EMIT_CALL(__skb_get_nlattr_nest); |
bd4cf0ed AS |
325 | break; |
326 | case SKF_AD_OFF + SKF_AD_CPU: | |
f8f6d679 | 327 | *insn = BPF_EMIT_CALL(__get_raw_cpu_id); |
bd4cf0ed | 328 | break; |
4cd3675e | 329 | case SKF_AD_OFF + SKF_AD_RANDOM: |
3ad00405 DB |
330 | *insn = BPF_EMIT_CALL(bpf_user_rnd_u32); |
331 | bpf_user_rnd_init_once(); | |
4cd3675e | 332 | break; |
bd4cf0ed AS |
333 | } |
334 | break; | |
335 | ||
336 | case SKF_AD_OFF + SKF_AD_ALU_XOR_X: | |
9739eef1 AS |
337 | /* A ^= X */ |
338 | *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X); | |
bd4cf0ed AS |
339 | break; |
340 | ||
341 | default: | |
342 | /* This is just a dummy call to avoid letting the compiler | |
343 | * evict __bpf_call_base() as an optimization. Placed here | |
344 | * where no-one bothers. | |
345 | */ | |
346 | BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0); | |
347 | return false; | |
348 | } | |
349 | ||
350 | *insnp = insn; | |
351 | return true; | |
352 | } | |
353 | ||
354 | /** | |
8fb575ca | 355 | * bpf_convert_filter - convert filter program |
bd4cf0ed AS |
356 | * @prog: the user passed filter program |
357 | * @len: the length of the user passed filter program | |
50bbfed9 | 358 | * @new_prog: allocated 'struct bpf_prog' or NULL |
bd4cf0ed AS |
359 | * @new_len: pointer to store length of converted program |
360 | * | |
1f504ec9 TK |
361 | * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn' |
362 | * style extended BPF (eBPF). | |
bd4cf0ed AS |
363 | * Conversion workflow: |
364 | * | |
365 | * 1) First pass for calculating the new program length: | |
8fb575ca | 366 | * bpf_convert_filter(old_prog, old_len, NULL, &new_len) |
bd4cf0ed AS |
367 | * |
368 | * 2) 2nd pass to remap in two passes: 1st pass finds new | |
369 | * jump offsets, 2nd pass remapping: | |
8fb575ca | 370 | * bpf_convert_filter(old_prog, old_len, new_prog, &new_len); |
bd4cf0ed | 371 | */ |
d9e12f42 | 372 | static int bpf_convert_filter(struct sock_filter *prog, int len, |
50bbfed9 | 373 | struct bpf_prog *new_prog, int *new_len) |
bd4cf0ed | 374 | { |
50bbfed9 AS |
375 | int new_flen = 0, pass = 0, target, i, stack_off; |
376 | struct bpf_insn *new_insn, *first_insn = NULL; | |
bd4cf0ed AS |
377 | struct sock_filter *fp; |
378 | int *addrs = NULL; | |
379 | u8 bpf_src; | |
380 | ||
381 | BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); | |
30743837 | 382 | BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); |
bd4cf0ed | 383 | |
6f9a093b | 384 | if (len <= 0 || len > BPF_MAXINSNS) |
bd4cf0ed AS |
385 | return -EINVAL; |
386 | ||
387 | if (new_prog) { | |
50bbfed9 | 388 | first_insn = new_prog->insnsi; |
658da937 DB |
389 | addrs = kcalloc(len, sizeof(*addrs), |
390 | GFP_KERNEL | __GFP_NOWARN); | |
bd4cf0ed AS |
391 | if (!addrs) |
392 | return -ENOMEM; | |
393 | } | |
394 | ||
395 | do_pass: | |
50bbfed9 | 396 | new_insn = first_insn; |
bd4cf0ed AS |
397 | fp = prog; |
398 | ||
8b614aeb | 399 | /* Classic BPF related prologue emission. */ |
50bbfed9 | 400 | if (new_prog) { |
8b614aeb DB |
401 | /* Classic BPF expects A and X to be reset first. These need |
402 | * to be guaranteed to be the first two instructions. | |
403 | */ | |
404 | *new_insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); | |
405 | *new_insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_X, BPF_REG_X); | |
406 | ||
407 | /* All programs must keep CTX in callee saved BPF_REG_CTX. | |
408 | * In eBPF case it's done by the compiler, here we need to | |
409 | * do this ourself. Initial CTX is present in BPF_REG_ARG1. | |
410 | */ | |
411 | *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1); | |
412 | } else { | |
413 | new_insn += 3; | |
414 | } | |
bd4cf0ed AS |
415 | |
416 | for (i = 0; i < len; fp++, i++) { | |
2695fb55 AS |
417 | struct bpf_insn tmp_insns[6] = { }; |
418 | struct bpf_insn *insn = tmp_insns; | |
bd4cf0ed AS |
419 | |
420 | if (addrs) | |
50bbfed9 | 421 | addrs[i] = new_insn - first_insn; |
bd4cf0ed AS |
422 | |
423 | switch (fp->code) { | |
424 | /* All arithmetic insns and skb loads map as-is. */ | |
425 | case BPF_ALU | BPF_ADD | BPF_X: | |
426 | case BPF_ALU | BPF_ADD | BPF_K: | |
427 | case BPF_ALU | BPF_SUB | BPF_X: | |
428 | case BPF_ALU | BPF_SUB | BPF_K: | |
429 | case BPF_ALU | BPF_AND | BPF_X: | |
430 | case BPF_ALU | BPF_AND | BPF_K: | |
431 | case BPF_ALU | BPF_OR | BPF_X: | |
432 | case BPF_ALU | BPF_OR | BPF_K: | |
433 | case BPF_ALU | BPF_LSH | BPF_X: | |
434 | case BPF_ALU | BPF_LSH | BPF_K: | |
435 | case BPF_ALU | BPF_RSH | BPF_X: | |
436 | case BPF_ALU | BPF_RSH | BPF_K: | |
437 | case BPF_ALU | BPF_XOR | BPF_X: | |
438 | case BPF_ALU | BPF_XOR | BPF_K: | |
439 | case BPF_ALU | BPF_MUL | BPF_X: | |
440 | case BPF_ALU | BPF_MUL | BPF_K: | |
441 | case BPF_ALU | BPF_DIV | BPF_X: | |
442 | case BPF_ALU | BPF_DIV | BPF_K: | |
443 | case BPF_ALU | BPF_MOD | BPF_X: | |
444 | case BPF_ALU | BPF_MOD | BPF_K: | |
445 | case BPF_ALU | BPF_NEG: | |
446 | case BPF_LD | BPF_ABS | BPF_W: | |
447 | case BPF_LD | BPF_ABS | BPF_H: | |
448 | case BPF_LD | BPF_ABS | BPF_B: | |
449 | case BPF_LD | BPF_IND | BPF_W: | |
450 | case BPF_LD | BPF_IND | BPF_H: | |
451 | case BPF_LD | BPF_IND | BPF_B: | |
452 | /* Check for overloaded BPF extension and | |
453 | * directly convert it if found, otherwise | |
454 | * just move on with mapping. | |
455 | */ | |
456 | if (BPF_CLASS(fp->code) == BPF_LD && | |
457 | BPF_MODE(fp->code) == BPF_ABS && | |
458 | convert_bpf_extensions(fp, &insn)) | |
459 | break; | |
460 | ||
f8f6d679 | 461 | *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k); |
bd4cf0ed AS |
462 | break; |
463 | ||
f8f6d679 DB |
464 | /* Jump transformation cannot use BPF block macros |
465 | * everywhere as offset calculation and target updates | |
466 | * require a bit more work than the rest, i.e. jump | |
467 | * opcodes map as-is, but offsets need adjustment. | |
468 | */ | |
469 | ||
470 | #define BPF_EMIT_JMP \ | |
bd4cf0ed AS |
471 | do { \ |
472 | if (target >= len || target < 0) \ | |
473 | goto err; \ | |
474 | insn->off = addrs ? addrs[target] - addrs[i] - 1 : 0; \ | |
475 | /* Adjust pc relative offset for 2nd or 3rd insn. */ \ | |
476 | insn->off -= insn - tmp_insns; \ | |
477 | } while (0) | |
478 | ||
f8f6d679 DB |
479 | case BPF_JMP | BPF_JA: |
480 | target = i + fp->k + 1; | |
481 | insn->code = fp->code; | |
482 | BPF_EMIT_JMP; | |
bd4cf0ed AS |
483 | break; |
484 | ||
485 | case BPF_JMP | BPF_JEQ | BPF_K: | |
486 | case BPF_JMP | BPF_JEQ | BPF_X: | |
487 | case BPF_JMP | BPF_JSET | BPF_K: | |
488 | case BPF_JMP | BPF_JSET | BPF_X: | |
489 | case BPF_JMP | BPF_JGT | BPF_K: | |
490 | case BPF_JMP | BPF_JGT | BPF_X: | |
491 | case BPF_JMP | BPF_JGE | BPF_K: | |
492 | case BPF_JMP | BPF_JGE | BPF_X: | |
493 | if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) { | |
494 | /* BPF immediates are signed, zero extend | |
495 | * immediate into tmp register and use it | |
496 | * in compare insn. | |
497 | */ | |
f8f6d679 | 498 | *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k); |
bd4cf0ed | 499 | |
e430f34e AS |
500 | insn->dst_reg = BPF_REG_A; |
501 | insn->src_reg = BPF_REG_TMP; | |
bd4cf0ed AS |
502 | bpf_src = BPF_X; |
503 | } else { | |
e430f34e | 504 | insn->dst_reg = BPF_REG_A; |
bd4cf0ed AS |
505 | insn->imm = fp->k; |
506 | bpf_src = BPF_SRC(fp->code); | |
19539ce7 | 507 | insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0; |
1da177e4 | 508 | } |
bd4cf0ed AS |
509 | |
510 | /* Common case where 'jump_false' is next insn. */ | |
511 | if (fp->jf == 0) { | |
512 | insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; | |
513 | target = i + fp->jt + 1; | |
f8f6d679 | 514 | BPF_EMIT_JMP; |
bd4cf0ed | 515 | break; |
1da177e4 | 516 | } |
bd4cf0ed | 517 | |
92b31a9a DB |
518 | /* Convert some jumps when 'jump_true' is next insn. */ |
519 | if (fp->jt == 0) { | |
520 | switch (BPF_OP(fp->code)) { | |
521 | case BPF_JEQ: | |
522 | insn->code = BPF_JMP | BPF_JNE | bpf_src; | |
523 | break; | |
524 | case BPF_JGT: | |
525 | insn->code = BPF_JMP | BPF_JLE | bpf_src; | |
526 | break; | |
527 | case BPF_JGE: | |
528 | insn->code = BPF_JMP | BPF_JLT | bpf_src; | |
529 | break; | |
530 | default: | |
531 | goto jmp_rest; | |
532 | } | |
533 | ||
bd4cf0ed | 534 | target = i + fp->jf + 1; |
f8f6d679 | 535 | BPF_EMIT_JMP; |
bd4cf0ed | 536 | break; |
0b05b2a4 | 537 | } |
92b31a9a | 538 | jmp_rest: |
bd4cf0ed AS |
539 | /* Other jumps are mapped into two insns: Jxx and JA. */ |
540 | target = i + fp->jt + 1; | |
541 | insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; | |
f8f6d679 | 542 | BPF_EMIT_JMP; |
bd4cf0ed AS |
543 | insn++; |
544 | ||
545 | insn->code = BPF_JMP | BPF_JA; | |
546 | target = i + fp->jf + 1; | |
f8f6d679 | 547 | BPF_EMIT_JMP; |
bd4cf0ed AS |
548 | break; |
549 | ||
550 | /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */ | |
551 | case BPF_LDX | BPF_MSH | BPF_B: | |
9739eef1 | 552 | /* tmp = A */ |
f8f6d679 | 553 | *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_A); |
1268e253 | 554 | /* A = BPF_R0 = *(u8 *) (skb->data + K) */ |
f8f6d679 | 555 | *insn++ = BPF_LD_ABS(BPF_B, fp->k); |
9739eef1 | 556 | /* A &= 0xf */ |
f8f6d679 | 557 | *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf); |
9739eef1 | 558 | /* A <<= 2 */ |
f8f6d679 | 559 | *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2); |
9739eef1 | 560 | /* X = A */ |
f8f6d679 | 561 | *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
9739eef1 | 562 | /* A = tmp */ |
f8f6d679 | 563 | *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP); |
bd4cf0ed AS |
564 | break; |
565 | ||
6205b9cf DB |
566 | /* RET_K is remaped into 2 insns. RET_A case doesn't need an |
567 | * extra mov as BPF_REG_0 is already mapped into BPF_REG_A. | |
568 | */ | |
bd4cf0ed AS |
569 | case BPF_RET | BPF_A: |
570 | case BPF_RET | BPF_K: | |
6205b9cf DB |
571 | if (BPF_RVAL(fp->code) == BPF_K) |
572 | *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0, | |
573 | 0, fp->k); | |
9739eef1 | 574 | *insn = BPF_EXIT_INSN(); |
bd4cf0ed AS |
575 | break; |
576 | ||
577 | /* Store to stack. */ | |
578 | case BPF_ST: | |
579 | case BPF_STX: | |
50bbfed9 | 580 | stack_off = fp->k * 4 + 4; |
f8f6d679 DB |
581 | *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) == |
582 | BPF_ST ? BPF_REG_A : BPF_REG_X, | |
50bbfed9 AS |
583 | -stack_off); |
584 | /* check_load_and_stores() verifies that classic BPF can | |
585 | * load from stack only after write, so tracking | |
586 | * stack_depth for ST|STX insns is enough | |
587 | */ | |
588 | if (new_prog && new_prog->aux->stack_depth < stack_off) | |
589 | new_prog->aux->stack_depth = stack_off; | |
bd4cf0ed AS |
590 | break; |
591 | ||
592 | /* Load from stack. */ | |
593 | case BPF_LD | BPF_MEM: | |
594 | case BPF_LDX | BPF_MEM: | |
50bbfed9 | 595 | stack_off = fp->k * 4 + 4; |
f8f6d679 DB |
596 | *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? |
597 | BPF_REG_A : BPF_REG_X, BPF_REG_FP, | |
50bbfed9 | 598 | -stack_off); |
bd4cf0ed AS |
599 | break; |
600 | ||
601 | /* A = K or X = K */ | |
602 | case BPF_LD | BPF_IMM: | |
603 | case BPF_LDX | BPF_IMM: | |
f8f6d679 DB |
604 | *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ? |
605 | BPF_REG_A : BPF_REG_X, fp->k); | |
bd4cf0ed AS |
606 | break; |
607 | ||
608 | /* X = A */ | |
609 | case BPF_MISC | BPF_TAX: | |
f8f6d679 | 610 | *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
bd4cf0ed AS |
611 | break; |
612 | ||
613 | /* A = X */ | |
614 | case BPF_MISC | BPF_TXA: | |
f8f6d679 | 615 | *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X); |
bd4cf0ed AS |
616 | break; |
617 | ||
618 | /* A = skb->len or X = skb->len */ | |
619 | case BPF_LD | BPF_W | BPF_LEN: | |
620 | case BPF_LDX | BPF_W | BPF_LEN: | |
f8f6d679 DB |
621 | *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? |
622 | BPF_REG_A : BPF_REG_X, BPF_REG_CTX, | |
623 | offsetof(struct sk_buff, len)); | |
bd4cf0ed AS |
624 | break; |
625 | ||
f8f6d679 | 626 | /* Access seccomp_data fields. */ |
bd4cf0ed | 627 | case BPF_LDX | BPF_ABS | BPF_W: |
9739eef1 AS |
628 | /* A = *(u32 *) (ctx + K) */ |
629 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); | |
bd4cf0ed AS |
630 | break; |
631 | ||
ca9f1fd2 | 632 | /* Unknown instruction. */ |
1da177e4 | 633 | default: |
bd4cf0ed | 634 | goto err; |
1da177e4 | 635 | } |
bd4cf0ed AS |
636 | |
637 | insn++; | |
638 | if (new_prog) | |
639 | memcpy(new_insn, tmp_insns, | |
640 | sizeof(*insn) * (insn - tmp_insns)); | |
bd4cf0ed | 641 | new_insn += insn - tmp_insns; |
1da177e4 LT |
642 | } |
643 | ||
bd4cf0ed AS |
644 | if (!new_prog) { |
645 | /* Only calculating new length. */ | |
50bbfed9 | 646 | *new_len = new_insn - first_insn; |
bd4cf0ed AS |
647 | return 0; |
648 | } | |
649 | ||
650 | pass++; | |
50bbfed9 AS |
651 | if (new_flen != new_insn - first_insn) { |
652 | new_flen = new_insn - first_insn; | |
bd4cf0ed AS |
653 | if (pass > 2) |
654 | goto err; | |
bd4cf0ed AS |
655 | goto do_pass; |
656 | } | |
657 | ||
658 | kfree(addrs); | |
659 | BUG_ON(*new_len != new_flen); | |
1da177e4 | 660 | return 0; |
bd4cf0ed AS |
661 | err: |
662 | kfree(addrs); | |
663 | return -EINVAL; | |
1da177e4 LT |
664 | } |
665 | ||
bd4cf0ed | 666 | /* Security: |
bd4cf0ed | 667 | * |
2d5311e4 | 668 | * As we dont want to clear mem[] array for each packet going through |
8ea6e345 | 669 | * __bpf_prog_run(), we check that filter loaded by user never try to read |
2d5311e4 | 670 | * a cell if not previously written, and we check all branches to be sure |
25985edc | 671 | * a malicious user doesn't try to abuse us. |
2d5311e4 | 672 | */ |
ec31a05c | 673 | static int check_load_and_stores(const struct sock_filter *filter, int flen) |
2d5311e4 | 674 | { |
34805931 | 675 | u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ |
2d5311e4 ED |
676 | int pc, ret = 0; |
677 | ||
678 | BUILD_BUG_ON(BPF_MEMWORDS > 16); | |
34805931 | 679 | |
99e72a0f | 680 | masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL); |
2d5311e4 ED |
681 | if (!masks) |
682 | return -ENOMEM; | |
34805931 | 683 | |
2d5311e4 ED |
684 | memset(masks, 0xff, flen * sizeof(*masks)); |
685 | ||
686 | for (pc = 0; pc < flen; pc++) { | |
687 | memvalid &= masks[pc]; | |
688 | ||
689 | switch (filter[pc].code) { | |
34805931 DB |
690 | case BPF_ST: |
691 | case BPF_STX: | |
2d5311e4 ED |
692 | memvalid |= (1 << filter[pc].k); |
693 | break; | |
34805931 DB |
694 | case BPF_LD | BPF_MEM: |
695 | case BPF_LDX | BPF_MEM: | |
2d5311e4 ED |
696 | if (!(memvalid & (1 << filter[pc].k))) { |
697 | ret = -EINVAL; | |
698 | goto error; | |
699 | } | |
700 | break; | |
34805931 DB |
701 | case BPF_JMP | BPF_JA: |
702 | /* A jump must set masks on target */ | |
2d5311e4 ED |
703 | masks[pc + 1 + filter[pc].k] &= memvalid; |
704 | memvalid = ~0; | |
705 | break; | |
34805931 DB |
706 | case BPF_JMP | BPF_JEQ | BPF_K: |
707 | case BPF_JMP | BPF_JEQ | BPF_X: | |
708 | case BPF_JMP | BPF_JGE | BPF_K: | |
709 | case BPF_JMP | BPF_JGE | BPF_X: | |
710 | case BPF_JMP | BPF_JGT | BPF_K: | |
711 | case BPF_JMP | BPF_JGT | BPF_X: | |
712 | case BPF_JMP | BPF_JSET | BPF_K: | |
713 | case BPF_JMP | BPF_JSET | BPF_X: | |
714 | /* A jump must set masks on targets */ | |
2d5311e4 ED |
715 | masks[pc + 1 + filter[pc].jt] &= memvalid; |
716 | masks[pc + 1 + filter[pc].jf] &= memvalid; | |
717 | memvalid = ~0; | |
718 | break; | |
719 | } | |
720 | } | |
721 | error: | |
722 | kfree(masks); | |
723 | return ret; | |
724 | } | |
725 | ||
34805931 DB |
726 | static bool chk_code_allowed(u16 code_to_probe) |
727 | { | |
728 | static const bool codes[] = { | |
729 | /* 32 bit ALU operations */ | |
730 | [BPF_ALU | BPF_ADD | BPF_K] = true, | |
731 | [BPF_ALU | BPF_ADD | BPF_X] = true, | |
732 | [BPF_ALU | BPF_SUB | BPF_K] = true, | |
733 | [BPF_ALU | BPF_SUB | BPF_X] = true, | |
734 | [BPF_ALU | BPF_MUL | BPF_K] = true, | |
735 | [BPF_ALU | BPF_MUL | BPF_X] = true, | |
736 | [BPF_ALU | BPF_DIV | BPF_K] = true, | |
737 | [BPF_ALU | BPF_DIV | BPF_X] = true, | |
738 | [BPF_ALU | BPF_MOD | BPF_K] = true, | |
739 | [BPF_ALU | BPF_MOD | BPF_X] = true, | |
740 | [BPF_ALU | BPF_AND | BPF_K] = true, | |
741 | [BPF_ALU | BPF_AND | BPF_X] = true, | |
742 | [BPF_ALU | BPF_OR | BPF_K] = true, | |
743 | [BPF_ALU | BPF_OR | BPF_X] = true, | |
744 | [BPF_ALU | BPF_XOR | BPF_K] = true, | |
745 | [BPF_ALU | BPF_XOR | BPF_X] = true, | |
746 | [BPF_ALU | BPF_LSH | BPF_K] = true, | |
747 | [BPF_ALU | BPF_LSH | BPF_X] = true, | |
748 | [BPF_ALU | BPF_RSH | BPF_K] = true, | |
749 | [BPF_ALU | BPF_RSH | BPF_X] = true, | |
750 | [BPF_ALU | BPF_NEG] = true, | |
751 | /* Load instructions */ | |
752 | [BPF_LD | BPF_W | BPF_ABS] = true, | |
753 | [BPF_LD | BPF_H | BPF_ABS] = true, | |
754 | [BPF_LD | BPF_B | BPF_ABS] = true, | |
755 | [BPF_LD | BPF_W | BPF_LEN] = true, | |
756 | [BPF_LD | BPF_W | BPF_IND] = true, | |
757 | [BPF_LD | BPF_H | BPF_IND] = true, | |
758 | [BPF_LD | BPF_B | BPF_IND] = true, | |
759 | [BPF_LD | BPF_IMM] = true, | |
760 | [BPF_LD | BPF_MEM] = true, | |
761 | [BPF_LDX | BPF_W | BPF_LEN] = true, | |
762 | [BPF_LDX | BPF_B | BPF_MSH] = true, | |
763 | [BPF_LDX | BPF_IMM] = true, | |
764 | [BPF_LDX | BPF_MEM] = true, | |
765 | /* Store instructions */ | |
766 | [BPF_ST] = true, | |
767 | [BPF_STX] = true, | |
768 | /* Misc instructions */ | |
769 | [BPF_MISC | BPF_TAX] = true, | |
770 | [BPF_MISC | BPF_TXA] = true, | |
771 | /* Return instructions */ | |
772 | [BPF_RET | BPF_K] = true, | |
773 | [BPF_RET | BPF_A] = true, | |
774 | /* Jump instructions */ | |
775 | [BPF_JMP | BPF_JA] = true, | |
776 | [BPF_JMP | BPF_JEQ | BPF_K] = true, | |
777 | [BPF_JMP | BPF_JEQ | BPF_X] = true, | |
778 | [BPF_JMP | BPF_JGE | BPF_K] = true, | |
779 | [BPF_JMP | BPF_JGE | BPF_X] = true, | |
780 | [BPF_JMP | BPF_JGT | BPF_K] = true, | |
781 | [BPF_JMP | BPF_JGT | BPF_X] = true, | |
782 | [BPF_JMP | BPF_JSET | BPF_K] = true, | |
783 | [BPF_JMP | BPF_JSET | BPF_X] = true, | |
784 | }; | |
785 | ||
786 | if (code_to_probe >= ARRAY_SIZE(codes)) | |
787 | return false; | |
788 | ||
789 | return codes[code_to_probe]; | |
790 | } | |
791 | ||
f7bd9e36 DB |
792 | static bool bpf_check_basics_ok(const struct sock_filter *filter, |
793 | unsigned int flen) | |
794 | { | |
795 | if (filter == NULL) | |
796 | return false; | |
797 | if (flen == 0 || flen > BPF_MAXINSNS) | |
798 | return false; | |
799 | ||
800 | return true; | |
801 | } | |
802 | ||
1da177e4 | 803 | /** |
4df95ff4 | 804 | * bpf_check_classic - verify socket filter code |
1da177e4 LT |
805 | * @filter: filter to verify |
806 | * @flen: length of filter | |
807 | * | |
808 | * Check the user's filter code. If we let some ugly | |
809 | * filter code slip through kaboom! The filter must contain | |
93699863 KK |
810 | * no references or jumps that are out of range, no illegal |
811 | * instructions, and must end with a RET instruction. | |
1da177e4 | 812 | * |
7b11f69f KK |
813 | * All jumps are forward as they are not signed. |
814 | * | |
815 | * Returns 0 if the rule set is legal or -EINVAL if not. | |
1da177e4 | 816 | */ |
d9e12f42 NS |
817 | static int bpf_check_classic(const struct sock_filter *filter, |
818 | unsigned int flen) | |
1da177e4 | 819 | { |
aa1113d9 | 820 | bool anc_found; |
34805931 | 821 | int pc; |
1da177e4 | 822 | |
34805931 | 823 | /* Check the filter code now */ |
1da177e4 | 824 | for (pc = 0; pc < flen; pc++) { |
ec31a05c | 825 | const struct sock_filter *ftest = &filter[pc]; |
93699863 | 826 | |
34805931 DB |
827 | /* May we actually operate on this code? */ |
828 | if (!chk_code_allowed(ftest->code)) | |
cba328fc | 829 | return -EINVAL; |
34805931 | 830 | |
93699863 | 831 | /* Some instructions need special checks */ |
34805931 DB |
832 | switch (ftest->code) { |
833 | case BPF_ALU | BPF_DIV | BPF_K: | |
834 | case BPF_ALU | BPF_MOD | BPF_K: | |
835 | /* Check for division by zero */ | |
b6069a95 ED |
836 | if (ftest->k == 0) |
837 | return -EINVAL; | |
838 | break; | |
229394e8 RV |
839 | case BPF_ALU | BPF_LSH | BPF_K: |
840 | case BPF_ALU | BPF_RSH | BPF_K: | |
841 | if (ftest->k >= 32) | |
842 | return -EINVAL; | |
843 | break; | |
34805931 DB |
844 | case BPF_LD | BPF_MEM: |
845 | case BPF_LDX | BPF_MEM: | |
846 | case BPF_ST: | |
847 | case BPF_STX: | |
848 | /* Check for invalid memory addresses */ | |
93699863 KK |
849 | if (ftest->k >= BPF_MEMWORDS) |
850 | return -EINVAL; | |
851 | break; | |
34805931 DB |
852 | case BPF_JMP | BPF_JA: |
853 | /* Note, the large ftest->k might cause loops. | |
93699863 KK |
854 | * Compare this with conditional jumps below, |
855 | * where offsets are limited. --ANK (981016) | |
856 | */ | |
34805931 | 857 | if (ftest->k >= (unsigned int)(flen - pc - 1)) |
93699863 | 858 | return -EINVAL; |
01f2f3f6 | 859 | break; |
34805931 DB |
860 | case BPF_JMP | BPF_JEQ | BPF_K: |
861 | case BPF_JMP | BPF_JEQ | BPF_X: | |
862 | case BPF_JMP | BPF_JGE | BPF_K: | |
863 | case BPF_JMP | BPF_JGE | BPF_X: | |
864 | case BPF_JMP | BPF_JGT | BPF_K: | |
865 | case BPF_JMP | BPF_JGT | BPF_X: | |
866 | case BPF_JMP | BPF_JSET | BPF_K: | |
867 | case BPF_JMP | BPF_JSET | BPF_X: | |
868 | /* Both conditionals must be safe */ | |
e35bedf3 | 869 | if (pc + ftest->jt + 1 >= flen || |
93699863 KK |
870 | pc + ftest->jf + 1 >= flen) |
871 | return -EINVAL; | |
cba328fc | 872 | break; |
34805931 DB |
873 | case BPF_LD | BPF_W | BPF_ABS: |
874 | case BPF_LD | BPF_H | BPF_ABS: | |
875 | case BPF_LD | BPF_B | BPF_ABS: | |
aa1113d9 | 876 | anc_found = false; |
34805931 DB |
877 | if (bpf_anc_helper(ftest) & BPF_ANC) |
878 | anc_found = true; | |
879 | /* Ancillary operation unknown or unsupported */ | |
aa1113d9 DB |
880 | if (anc_found == false && ftest->k >= SKF_AD_OFF) |
881 | return -EINVAL; | |
01f2f3f6 HPP |
882 | } |
883 | } | |
93699863 | 884 | |
34805931 | 885 | /* Last instruction must be a RET code */ |
01f2f3f6 | 886 | switch (filter[flen - 1].code) { |
34805931 DB |
887 | case BPF_RET | BPF_K: |
888 | case BPF_RET | BPF_A: | |
2d5311e4 | 889 | return check_load_and_stores(filter, flen); |
cba328fc | 890 | } |
34805931 | 891 | |
cba328fc | 892 | return -EINVAL; |
1da177e4 LT |
893 | } |
894 | ||
7ae457c1 AS |
895 | static int bpf_prog_store_orig_filter(struct bpf_prog *fp, |
896 | const struct sock_fprog *fprog) | |
a3ea269b | 897 | { |
009937e7 | 898 | unsigned int fsize = bpf_classic_proglen(fprog); |
a3ea269b DB |
899 | struct sock_fprog_kern *fkprog; |
900 | ||
901 | fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL); | |
902 | if (!fp->orig_prog) | |
903 | return -ENOMEM; | |
904 | ||
905 | fkprog = fp->orig_prog; | |
906 | fkprog->len = fprog->len; | |
658da937 DB |
907 | |
908 | fkprog->filter = kmemdup(fp->insns, fsize, | |
909 | GFP_KERNEL | __GFP_NOWARN); | |
a3ea269b DB |
910 | if (!fkprog->filter) { |
911 | kfree(fp->orig_prog); | |
912 | return -ENOMEM; | |
913 | } | |
914 | ||
915 | return 0; | |
916 | } | |
917 | ||
7ae457c1 | 918 | static void bpf_release_orig_filter(struct bpf_prog *fp) |
a3ea269b DB |
919 | { |
920 | struct sock_fprog_kern *fprog = fp->orig_prog; | |
921 | ||
922 | if (fprog) { | |
923 | kfree(fprog->filter); | |
924 | kfree(fprog); | |
925 | } | |
926 | } | |
927 | ||
7ae457c1 AS |
928 | static void __bpf_prog_release(struct bpf_prog *prog) |
929 | { | |
24701ece | 930 | if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) { |
89aa0758 AS |
931 | bpf_prog_put(prog); |
932 | } else { | |
933 | bpf_release_orig_filter(prog); | |
934 | bpf_prog_free(prog); | |
935 | } | |
7ae457c1 AS |
936 | } |
937 | ||
34c5bd66 PN |
938 | static void __sk_filter_release(struct sk_filter *fp) |
939 | { | |
7ae457c1 AS |
940 | __bpf_prog_release(fp->prog); |
941 | kfree(fp); | |
34c5bd66 PN |
942 | } |
943 | ||
47e958ea | 944 | /** |
46bcf14f | 945 | * sk_filter_release_rcu - Release a socket filter by rcu_head |
47e958ea PE |
946 | * @rcu: rcu_head that contains the sk_filter to free |
947 | */ | |
fbc907f0 | 948 | static void sk_filter_release_rcu(struct rcu_head *rcu) |
47e958ea PE |
949 | { |
950 | struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); | |
951 | ||
34c5bd66 | 952 | __sk_filter_release(fp); |
47e958ea | 953 | } |
fbc907f0 DB |
954 | |
955 | /** | |
956 | * sk_filter_release - release a socket filter | |
957 | * @fp: filter to remove | |
958 | * | |
959 | * Remove a filter from a socket and release its resources. | |
960 | */ | |
961 | static void sk_filter_release(struct sk_filter *fp) | |
962 | { | |
4c355cdf | 963 | if (refcount_dec_and_test(&fp->refcnt)) |
fbc907f0 DB |
964 | call_rcu(&fp->rcu, sk_filter_release_rcu); |
965 | } | |
966 | ||
967 | void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) | |
968 | { | |
7ae457c1 | 969 | u32 filter_size = bpf_prog_size(fp->prog->len); |
fbc907f0 | 970 | |
278571ba AS |
971 | atomic_sub(filter_size, &sk->sk_omem_alloc); |
972 | sk_filter_release(fp); | |
fbc907f0 | 973 | } |
47e958ea | 974 | |
278571ba AS |
975 | /* try to charge the socket memory if there is space available |
976 | * return true on success | |
977 | */ | |
4c355cdf | 978 | static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
bd4cf0ed | 979 | { |
7ae457c1 | 980 | u32 filter_size = bpf_prog_size(fp->prog->len); |
278571ba AS |
981 | |
982 | /* same check as in sock_kmalloc() */ | |
983 | if (filter_size <= sysctl_optmem_max && | |
984 | atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) { | |
278571ba AS |
985 | atomic_add(filter_size, &sk->sk_omem_alloc); |
986 | return true; | |
bd4cf0ed | 987 | } |
278571ba | 988 | return false; |
bd4cf0ed AS |
989 | } |
990 | ||
4c355cdf RE |
991 | bool sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
992 | { | |
eefca20e ED |
993 | if (!refcount_inc_not_zero(&fp->refcnt)) |
994 | return false; | |
995 | ||
996 | if (!__sk_filter_charge(sk, fp)) { | |
997 | sk_filter_release(fp); | |
998 | return false; | |
999 | } | |
1000 | return true; | |
4c355cdf RE |
1001 | } |
1002 | ||
7ae457c1 | 1003 | static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp) |
bd4cf0ed AS |
1004 | { |
1005 | struct sock_filter *old_prog; | |
7ae457c1 | 1006 | struct bpf_prog *old_fp; |
34805931 | 1007 | int err, new_len, old_len = fp->len; |
bd4cf0ed AS |
1008 | |
1009 | /* We are free to overwrite insns et al right here as it | |
1010 | * won't be used at this point in time anymore internally | |
1011 | * after the migration to the internal BPF instruction | |
1012 | * representation. | |
1013 | */ | |
1014 | BUILD_BUG_ON(sizeof(struct sock_filter) != | |
2695fb55 | 1015 | sizeof(struct bpf_insn)); |
bd4cf0ed | 1016 | |
bd4cf0ed AS |
1017 | /* Conversion cannot happen on overlapping memory areas, |
1018 | * so we need to keep the user BPF around until the 2nd | |
1019 | * pass. At this time, the user BPF is stored in fp->insns. | |
1020 | */ | |
1021 | old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter), | |
658da937 | 1022 | GFP_KERNEL | __GFP_NOWARN); |
bd4cf0ed AS |
1023 | if (!old_prog) { |
1024 | err = -ENOMEM; | |
1025 | goto out_err; | |
1026 | } | |
1027 | ||
1028 | /* 1st pass: calculate the new program length. */ | |
8fb575ca | 1029 | err = bpf_convert_filter(old_prog, old_len, NULL, &new_len); |
bd4cf0ed AS |
1030 | if (err) |
1031 | goto out_err_free; | |
1032 | ||
1033 | /* Expand fp for appending the new filter representation. */ | |
1034 | old_fp = fp; | |
60a3b225 | 1035 | fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0); |
bd4cf0ed AS |
1036 | if (!fp) { |
1037 | /* The old_fp is still around in case we couldn't | |
1038 | * allocate new memory, so uncharge on that one. | |
1039 | */ | |
1040 | fp = old_fp; | |
1041 | err = -ENOMEM; | |
1042 | goto out_err_free; | |
1043 | } | |
1044 | ||
bd4cf0ed AS |
1045 | fp->len = new_len; |
1046 | ||
2695fb55 | 1047 | /* 2nd pass: remap sock_filter insns into bpf_insn insns. */ |
50bbfed9 | 1048 | err = bpf_convert_filter(old_prog, old_len, fp, &new_len); |
bd4cf0ed | 1049 | if (err) |
8fb575ca | 1050 | /* 2nd bpf_convert_filter() can fail only if it fails |
bd4cf0ed AS |
1051 | * to allocate memory, remapping must succeed. Note, |
1052 | * that at this time old_fp has already been released | |
278571ba | 1053 | * by krealloc(). |
bd4cf0ed AS |
1054 | */ |
1055 | goto out_err_free; | |
1056 | ||
d1c55ab5 DB |
1057 | /* We are guaranteed to never error here with cBPF to eBPF |
1058 | * transitions, since there's no issue with type compatibility | |
1059 | * checks on program arrays. | |
1060 | */ | |
1061 | fp = bpf_prog_select_runtime(fp, &err); | |
5fe821a9 | 1062 | |
bd4cf0ed AS |
1063 | kfree(old_prog); |
1064 | return fp; | |
1065 | ||
1066 | out_err_free: | |
1067 | kfree(old_prog); | |
1068 | out_err: | |
7ae457c1 | 1069 | __bpf_prog_release(fp); |
bd4cf0ed AS |
1070 | return ERR_PTR(err); |
1071 | } | |
1072 | ||
ac67eb2c DB |
1073 | static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp, |
1074 | bpf_aux_classic_check_t trans) | |
302d6637 JP |
1075 | { |
1076 | int err; | |
1077 | ||
bd4cf0ed | 1078 | fp->bpf_func = NULL; |
a91263d5 | 1079 | fp->jited = 0; |
302d6637 | 1080 | |
4df95ff4 | 1081 | err = bpf_check_classic(fp->insns, fp->len); |
418c96ac | 1082 | if (err) { |
7ae457c1 | 1083 | __bpf_prog_release(fp); |
bd4cf0ed | 1084 | return ERR_PTR(err); |
418c96ac | 1085 | } |
302d6637 | 1086 | |
4ae92bc7 NS |
1087 | /* There might be additional checks and transformations |
1088 | * needed on classic filters, f.e. in case of seccomp. | |
1089 | */ | |
1090 | if (trans) { | |
1091 | err = trans(fp->insns, fp->len); | |
1092 | if (err) { | |
1093 | __bpf_prog_release(fp); | |
1094 | return ERR_PTR(err); | |
1095 | } | |
1096 | } | |
1097 | ||
bd4cf0ed AS |
1098 | /* Probe if we can JIT compile the filter and if so, do |
1099 | * the compilation of the filter. | |
1100 | */ | |
302d6637 | 1101 | bpf_jit_compile(fp); |
bd4cf0ed AS |
1102 | |
1103 | /* JIT compiler couldn't process this filter, so do the | |
1104 | * internal BPF translation for the optimized interpreter. | |
1105 | */ | |
5fe821a9 | 1106 | if (!fp->jited) |
7ae457c1 | 1107 | fp = bpf_migrate_filter(fp); |
bd4cf0ed AS |
1108 | |
1109 | return fp; | |
302d6637 JP |
1110 | } |
1111 | ||
1112 | /** | |
7ae457c1 | 1113 | * bpf_prog_create - create an unattached filter |
c6c4b97c | 1114 | * @pfp: the unattached filter that is created |
677a9fd3 | 1115 | * @fprog: the filter program |
302d6637 | 1116 | * |
c6c4b97c | 1117 | * Create a filter independent of any socket. We first run some |
302d6637 JP |
1118 | * sanity checks on it to make sure it does not explode on us later. |
1119 | * If an error occurs or there is insufficient memory for the filter | |
1120 | * a negative errno code is returned. On success the return is zero. | |
1121 | */ | |
7ae457c1 | 1122 | int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog) |
302d6637 | 1123 | { |
009937e7 | 1124 | unsigned int fsize = bpf_classic_proglen(fprog); |
7ae457c1 | 1125 | struct bpf_prog *fp; |
302d6637 JP |
1126 | |
1127 | /* Make sure new filter is there and in the right amounts. */ | |
f7bd9e36 | 1128 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
302d6637 JP |
1129 | return -EINVAL; |
1130 | ||
60a3b225 | 1131 | fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
302d6637 JP |
1132 | if (!fp) |
1133 | return -ENOMEM; | |
a3ea269b | 1134 | |
302d6637 JP |
1135 | memcpy(fp->insns, fprog->filter, fsize); |
1136 | ||
302d6637 | 1137 | fp->len = fprog->len; |
a3ea269b DB |
1138 | /* Since unattached filters are not copied back to user |
1139 | * space through sk_get_filter(), we do not need to hold | |
1140 | * a copy here, and can spare us the work. | |
1141 | */ | |
1142 | fp->orig_prog = NULL; | |
302d6637 | 1143 | |
7ae457c1 | 1144 | /* bpf_prepare_filter() already takes care of freeing |
bd4cf0ed AS |
1145 | * memory in case something goes wrong. |
1146 | */ | |
4ae92bc7 | 1147 | fp = bpf_prepare_filter(fp, NULL); |
bd4cf0ed AS |
1148 | if (IS_ERR(fp)) |
1149 | return PTR_ERR(fp); | |
302d6637 JP |
1150 | |
1151 | *pfp = fp; | |
1152 | return 0; | |
302d6637 | 1153 | } |
7ae457c1 | 1154 | EXPORT_SYMBOL_GPL(bpf_prog_create); |
302d6637 | 1155 | |
ac67eb2c DB |
1156 | /** |
1157 | * bpf_prog_create_from_user - create an unattached filter from user buffer | |
1158 | * @pfp: the unattached filter that is created | |
1159 | * @fprog: the filter program | |
1160 | * @trans: post-classic verifier transformation handler | |
bab18991 | 1161 | * @save_orig: save classic BPF program |
ac67eb2c DB |
1162 | * |
1163 | * This function effectively does the same as bpf_prog_create(), only | |
1164 | * that it builds up its insns buffer from user space provided buffer. | |
1165 | * It also allows for passing a bpf_aux_classic_check_t handler. | |
1166 | */ | |
1167 | int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, | |
bab18991 | 1168 | bpf_aux_classic_check_t trans, bool save_orig) |
ac67eb2c DB |
1169 | { |
1170 | unsigned int fsize = bpf_classic_proglen(fprog); | |
1171 | struct bpf_prog *fp; | |
bab18991 | 1172 | int err; |
ac67eb2c DB |
1173 | |
1174 | /* Make sure new filter is there and in the right amounts. */ | |
f7bd9e36 | 1175 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
ac67eb2c DB |
1176 | return -EINVAL; |
1177 | ||
1178 | fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); | |
1179 | if (!fp) | |
1180 | return -ENOMEM; | |
1181 | ||
1182 | if (copy_from_user(fp->insns, fprog->filter, fsize)) { | |
1183 | __bpf_prog_free(fp); | |
1184 | return -EFAULT; | |
1185 | } | |
1186 | ||
1187 | fp->len = fprog->len; | |
ac67eb2c DB |
1188 | fp->orig_prog = NULL; |
1189 | ||
bab18991 DB |
1190 | if (save_orig) { |
1191 | err = bpf_prog_store_orig_filter(fp, fprog); | |
1192 | if (err) { | |
1193 | __bpf_prog_free(fp); | |
1194 | return -ENOMEM; | |
1195 | } | |
1196 | } | |
1197 | ||
ac67eb2c DB |
1198 | /* bpf_prepare_filter() already takes care of freeing |
1199 | * memory in case something goes wrong. | |
1200 | */ | |
1201 | fp = bpf_prepare_filter(fp, trans); | |
1202 | if (IS_ERR(fp)) | |
1203 | return PTR_ERR(fp); | |
1204 | ||
1205 | *pfp = fp; | |
1206 | return 0; | |
1207 | } | |
2ea273d7 | 1208 | EXPORT_SYMBOL_GPL(bpf_prog_create_from_user); |
ac67eb2c | 1209 | |
7ae457c1 | 1210 | void bpf_prog_destroy(struct bpf_prog *fp) |
302d6637 | 1211 | { |
7ae457c1 | 1212 | __bpf_prog_release(fp); |
302d6637 | 1213 | } |
7ae457c1 | 1214 | EXPORT_SYMBOL_GPL(bpf_prog_destroy); |
302d6637 | 1215 | |
8ced425e | 1216 | static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk) |
49b31e57 DB |
1217 | { |
1218 | struct sk_filter *fp, *old_fp; | |
1219 | ||
1220 | fp = kmalloc(sizeof(*fp), GFP_KERNEL); | |
1221 | if (!fp) | |
1222 | return -ENOMEM; | |
1223 | ||
1224 | fp->prog = prog; | |
49b31e57 | 1225 | |
4c355cdf | 1226 | if (!__sk_filter_charge(sk, fp)) { |
49b31e57 DB |
1227 | kfree(fp); |
1228 | return -ENOMEM; | |
1229 | } | |
4c355cdf | 1230 | refcount_set(&fp->refcnt, 1); |
49b31e57 | 1231 | |
8ced425e HFS |
1232 | old_fp = rcu_dereference_protected(sk->sk_filter, |
1233 | lockdep_sock_is_held(sk)); | |
49b31e57 | 1234 | rcu_assign_pointer(sk->sk_filter, fp); |
8ced425e | 1235 | |
49b31e57 DB |
1236 | if (old_fp) |
1237 | sk_filter_uncharge(sk, old_fp); | |
1238 | ||
1239 | return 0; | |
1240 | } | |
1241 | ||
538950a1 CG |
1242 | static int __reuseport_attach_prog(struct bpf_prog *prog, struct sock *sk) |
1243 | { | |
1244 | struct bpf_prog *old_prog; | |
1245 | int err; | |
1246 | ||
1247 | if (bpf_prog_size(prog->len) > sysctl_optmem_max) | |
1248 | return -ENOMEM; | |
1249 | ||
fa463497 | 1250 | if (sk_unhashed(sk) && sk->sk_reuseport) { |
538950a1 CG |
1251 | err = reuseport_alloc(sk); |
1252 | if (err) | |
1253 | return err; | |
1254 | } else if (!rcu_access_pointer(sk->sk_reuseport_cb)) { | |
1255 | /* The socket wasn't bound with SO_REUSEPORT */ | |
1256 | return -EINVAL; | |
1257 | } | |
1258 | ||
1259 | old_prog = reuseport_attach_prog(sk, prog); | |
1260 | if (old_prog) | |
1261 | bpf_prog_destroy(old_prog); | |
1262 | ||
1263 | return 0; | |
1264 | } | |
1265 | ||
1266 | static | |
1267 | struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk) | |
1da177e4 | 1268 | { |
009937e7 | 1269 | unsigned int fsize = bpf_classic_proglen(fprog); |
7ae457c1 | 1270 | struct bpf_prog *prog; |
1da177e4 LT |
1271 | int err; |
1272 | ||
d59577b6 | 1273 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
538950a1 | 1274 | return ERR_PTR(-EPERM); |
d59577b6 | 1275 | |
1da177e4 | 1276 | /* Make sure new filter is there and in the right amounts. */ |
f7bd9e36 | 1277 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
538950a1 | 1278 | return ERR_PTR(-EINVAL); |
1da177e4 | 1279 | |
f7bd9e36 | 1280 | prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
7ae457c1 | 1281 | if (!prog) |
538950a1 | 1282 | return ERR_PTR(-ENOMEM); |
a3ea269b | 1283 | |
7ae457c1 | 1284 | if (copy_from_user(prog->insns, fprog->filter, fsize)) { |
c0d1379a | 1285 | __bpf_prog_free(prog); |
538950a1 | 1286 | return ERR_PTR(-EFAULT); |
1da177e4 LT |
1287 | } |
1288 | ||
7ae457c1 | 1289 | prog->len = fprog->len; |
1da177e4 | 1290 | |
7ae457c1 | 1291 | err = bpf_prog_store_orig_filter(prog, fprog); |
a3ea269b | 1292 | if (err) { |
c0d1379a | 1293 | __bpf_prog_free(prog); |
538950a1 | 1294 | return ERR_PTR(-ENOMEM); |
a3ea269b DB |
1295 | } |
1296 | ||
7ae457c1 | 1297 | /* bpf_prepare_filter() already takes care of freeing |
bd4cf0ed AS |
1298 | * memory in case something goes wrong. |
1299 | */ | |
538950a1 CG |
1300 | return bpf_prepare_filter(prog, NULL); |
1301 | } | |
1302 | ||
1303 | /** | |
1304 | * sk_attach_filter - attach a socket filter | |
1305 | * @fprog: the filter program | |
1306 | * @sk: the socket to use | |
1307 | * | |
1308 | * Attach the user's filter code. We first run some sanity checks on | |
1309 | * it to make sure it does not explode on us later. If an error | |
1310 | * occurs or there is insufficient memory for the filter a negative | |
1311 | * errno code is returned. On success the return is zero. | |
1312 | */ | |
8ced425e | 1313 | int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) |
538950a1 CG |
1314 | { |
1315 | struct bpf_prog *prog = __get_filter(fprog, sk); | |
1316 | int err; | |
1317 | ||
7ae457c1 AS |
1318 | if (IS_ERR(prog)) |
1319 | return PTR_ERR(prog); | |
1320 | ||
8ced425e | 1321 | err = __sk_attach_prog(prog, sk); |
49b31e57 | 1322 | if (err < 0) { |
7ae457c1 | 1323 | __bpf_prog_release(prog); |
49b31e57 | 1324 | return err; |
278571ba AS |
1325 | } |
1326 | ||
d3904b73 | 1327 | return 0; |
1da177e4 | 1328 | } |
8ced425e | 1329 | EXPORT_SYMBOL_GPL(sk_attach_filter); |
1da177e4 | 1330 | |
538950a1 | 1331 | int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk) |
89aa0758 | 1332 | { |
538950a1 | 1333 | struct bpf_prog *prog = __get_filter(fprog, sk); |
49b31e57 | 1334 | int err; |
89aa0758 | 1335 | |
538950a1 CG |
1336 | if (IS_ERR(prog)) |
1337 | return PTR_ERR(prog); | |
1338 | ||
1339 | err = __reuseport_attach_prog(prog, sk); | |
1340 | if (err < 0) { | |
1341 | __bpf_prog_release(prog); | |
1342 | return err; | |
1343 | } | |
1344 | ||
1345 | return 0; | |
1346 | } | |
1347 | ||
1348 | static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk) | |
1349 | { | |
89aa0758 | 1350 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
538950a1 | 1351 | return ERR_PTR(-EPERM); |
89aa0758 | 1352 | |
113214be | 1353 | return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); |
538950a1 CG |
1354 | } |
1355 | ||
1356 | int sk_attach_bpf(u32 ufd, struct sock *sk) | |
1357 | { | |
1358 | struct bpf_prog *prog = __get_bpf(ufd, sk); | |
1359 | int err; | |
1360 | ||
1361 | if (IS_ERR(prog)) | |
1362 | return PTR_ERR(prog); | |
1363 | ||
8ced425e | 1364 | err = __sk_attach_prog(prog, sk); |
49b31e57 | 1365 | if (err < 0) { |
89aa0758 | 1366 | bpf_prog_put(prog); |
49b31e57 | 1367 | return err; |
89aa0758 AS |
1368 | } |
1369 | ||
89aa0758 AS |
1370 | return 0; |
1371 | } | |
1372 | ||
538950a1 CG |
1373 | int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk) |
1374 | { | |
1375 | struct bpf_prog *prog = __get_bpf(ufd, sk); | |
1376 | int err; | |
1377 | ||
1378 | if (IS_ERR(prog)) | |
1379 | return PTR_ERR(prog); | |
1380 | ||
1381 | err = __reuseport_attach_prog(prog, sk); | |
1382 | if (err < 0) { | |
1383 | bpf_prog_put(prog); | |
1384 | return err; | |
1385 | } | |
1386 | ||
1387 | return 0; | |
1388 | } | |
1389 | ||
21cafc1d DB |
1390 | struct bpf_scratchpad { |
1391 | union { | |
1392 | __be32 diff[MAX_BPF_STACK / sizeof(__be32)]; | |
1393 | u8 buff[MAX_BPF_STACK]; | |
1394 | }; | |
1395 | }; | |
1396 | ||
1397 | static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp); | |
91bc4822 | 1398 | |
5293efe6 DB |
1399 | static inline int __bpf_try_make_writable(struct sk_buff *skb, |
1400 | unsigned int write_len) | |
1401 | { | |
1402 | return skb_ensure_writable(skb, write_len); | |
1403 | } | |
1404 | ||
db58ba45 AS |
1405 | static inline int bpf_try_make_writable(struct sk_buff *skb, |
1406 | unsigned int write_len) | |
1407 | { | |
5293efe6 | 1408 | int err = __bpf_try_make_writable(skb, write_len); |
db58ba45 | 1409 | |
6aaae2b6 | 1410 | bpf_compute_data_pointers(skb); |
db58ba45 AS |
1411 | return err; |
1412 | } | |
1413 | ||
36bbef52 DB |
1414 | static int bpf_try_make_head_writable(struct sk_buff *skb) |
1415 | { | |
1416 | return bpf_try_make_writable(skb, skb_headlen(skb)); | |
1417 | } | |
1418 | ||
a2bfe6bf DB |
1419 | static inline void bpf_push_mac_rcsum(struct sk_buff *skb) |
1420 | { | |
1421 | if (skb_at_tc_ingress(skb)) | |
1422 | skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len); | |
1423 | } | |
1424 | ||
8065694e DB |
1425 | static inline void bpf_pull_mac_rcsum(struct sk_buff *skb) |
1426 | { | |
1427 | if (skb_at_tc_ingress(skb)) | |
1428 | skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len); | |
1429 | } | |
1430 | ||
f3694e00 DB |
1431 | BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset, |
1432 | const void *, from, u32, len, u64, flags) | |
608cd71a | 1433 | { |
608cd71a AS |
1434 | void *ptr; |
1435 | ||
8afd54c8 | 1436 | if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH))) |
781c53bc | 1437 | return -EINVAL; |
0ed661d5 | 1438 | if (unlikely(offset > 0xffff)) |
608cd71a | 1439 | return -EFAULT; |
db58ba45 | 1440 | if (unlikely(bpf_try_make_writable(skb, offset + len))) |
608cd71a AS |
1441 | return -EFAULT; |
1442 | ||
0ed661d5 | 1443 | ptr = skb->data + offset; |
781c53bc | 1444 | if (flags & BPF_F_RECOMPUTE_CSUM) |
479ffccc | 1445 | __skb_postpull_rcsum(skb, ptr, len, offset); |
608cd71a AS |
1446 | |
1447 | memcpy(ptr, from, len); | |
1448 | ||
781c53bc | 1449 | if (flags & BPF_F_RECOMPUTE_CSUM) |
479ffccc | 1450 | __skb_postpush_rcsum(skb, ptr, len, offset); |
8afd54c8 DB |
1451 | if (flags & BPF_F_INVALIDATE_HASH) |
1452 | skb_clear_hash(skb); | |
f8ffad69 | 1453 | |
608cd71a AS |
1454 | return 0; |
1455 | } | |
1456 | ||
577c50aa | 1457 | static const struct bpf_func_proto bpf_skb_store_bytes_proto = { |
608cd71a AS |
1458 | .func = bpf_skb_store_bytes, |
1459 | .gpl_only = false, | |
1460 | .ret_type = RET_INTEGER, | |
1461 | .arg1_type = ARG_PTR_TO_CTX, | |
1462 | .arg2_type = ARG_ANYTHING, | |
39f19ebb AS |
1463 | .arg3_type = ARG_PTR_TO_MEM, |
1464 | .arg4_type = ARG_CONST_SIZE, | |
91bc4822 AS |
1465 | .arg5_type = ARG_ANYTHING, |
1466 | }; | |
1467 | ||
f3694e00 DB |
1468 | BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset, |
1469 | void *, to, u32, len) | |
05c74e5e | 1470 | { |
05c74e5e DB |
1471 | void *ptr; |
1472 | ||
0ed661d5 | 1473 | if (unlikely(offset > 0xffff)) |
074f528e | 1474 | goto err_clear; |
05c74e5e DB |
1475 | |
1476 | ptr = skb_header_pointer(skb, offset, len, to); | |
1477 | if (unlikely(!ptr)) | |
074f528e | 1478 | goto err_clear; |
05c74e5e DB |
1479 | if (ptr != to) |
1480 | memcpy(to, ptr, len); | |
1481 | ||
1482 | return 0; | |
074f528e DB |
1483 | err_clear: |
1484 | memset(to, 0, len); | |
1485 | return -EFAULT; | |
05c74e5e DB |
1486 | } |
1487 | ||
577c50aa | 1488 | static const struct bpf_func_proto bpf_skb_load_bytes_proto = { |
05c74e5e DB |
1489 | .func = bpf_skb_load_bytes, |
1490 | .gpl_only = false, | |
1491 | .ret_type = RET_INTEGER, | |
1492 | .arg1_type = ARG_PTR_TO_CTX, | |
1493 | .arg2_type = ARG_ANYTHING, | |
39f19ebb AS |
1494 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, |
1495 | .arg4_type = ARG_CONST_SIZE, | |
05c74e5e DB |
1496 | }; |
1497 | ||
36bbef52 DB |
1498 | BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) |
1499 | { | |
1500 | /* Idea is the following: should the needed direct read/write | |
1501 | * test fail during runtime, we can pull in more data and redo | |
1502 | * again, since implicitly, we invalidate previous checks here. | |
1503 | * | |
1504 | * Or, since we know how much we need to make read/writeable, | |
1505 | * this can be done once at the program beginning for direct | |
1506 | * access case. By this we overcome limitations of only current | |
1507 | * headroom being accessible. | |
1508 | */ | |
1509 | return bpf_try_make_writable(skb, len ? : skb_headlen(skb)); | |
1510 | } | |
1511 | ||
1512 | static const struct bpf_func_proto bpf_skb_pull_data_proto = { | |
1513 | .func = bpf_skb_pull_data, | |
1514 | .gpl_only = false, | |
1515 | .ret_type = RET_INTEGER, | |
1516 | .arg1_type = ARG_PTR_TO_CTX, | |
1517 | .arg2_type = ARG_ANYTHING, | |
1518 | }; | |
1519 | ||
f3694e00 DB |
1520 | BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset, |
1521 | u64, from, u64, to, u64, flags) | |
91bc4822 | 1522 | { |
0ed661d5 | 1523 | __sum16 *ptr; |
91bc4822 | 1524 | |
781c53bc DB |
1525 | if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK))) |
1526 | return -EINVAL; | |
0ed661d5 | 1527 | if (unlikely(offset > 0xffff || offset & 1)) |
91bc4822 | 1528 | return -EFAULT; |
0ed661d5 | 1529 | if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) |
91bc4822 AS |
1530 | return -EFAULT; |
1531 | ||
0ed661d5 | 1532 | ptr = (__sum16 *)(skb->data + offset); |
781c53bc | 1533 | switch (flags & BPF_F_HDR_FIELD_MASK) { |
8050c0f0 DB |
1534 | case 0: |
1535 | if (unlikely(from != 0)) | |
1536 | return -EINVAL; | |
1537 | ||
1538 | csum_replace_by_diff(ptr, to); | |
1539 | break; | |
91bc4822 AS |
1540 | case 2: |
1541 | csum_replace2(ptr, from, to); | |
1542 | break; | |
1543 | case 4: | |
1544 | csum_replace4(ptr, from, to); | |
1545 | break; | |
1546 | default: | |
1547 | return -EINVAL; | |
1548 | } | |
1549 | ||
91bc4822 AS |
1550 | return 0; |
1551 | } | |
1552 | ||
577c50aa | 1553 | static const struct bpf_func_proto bpf_l3_csum_replace_proto = { |
91bc4822 AS |
1554 | .func = bpf_l3_csum_replace, |
1555 | .gpl_only = false, | |
1556 | .ret_type = RET_INTEGER, | |
1557 | .arg1_type = ARG_PTR_TO_CTX, | |
1558 | .arg2_type = ARG_ANYTHING, | |
1559 | .arg3_type = ARG_ANYTHING, | |
1560 | .arg4_type = ARG_ANYTHING, | |
1561 | .arg5_type = ARG_ANYTHING, | |
1562 | }; | |
1563 | ||
f3694e00 DB |
1564 | BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, |
1565 | u64, from, u64, to, u64, flags) | |
91bc4822 | 1566 | { |
781c53bc | 1567 | bool is_pseudo = flags & BPF_F_PSEUDO_HDR; |
2f72959a | 1568 | bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; |
d1b662ad | 1569 | bool do_mforce = flags & BPF_F_MARK_ENFORCE; |
0ed661d5 | 1570 | __sum16 *ptr; |
91bc4822 | 1571 | |
d1b662ad DB |
1572 | if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | |
1573 | BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) | |
781c53bc | 1574 | return -EINVAL; |
0ed661d5 | 1575 | if (unlikely(offset > 0xffff || offset & 1)) |
91bc4822 | 1576 | return -EFAULT; |
0ed661d5 | 1577 | if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) |
91bc4822 AS |
1578 | return -EFAULT; |
1579 | ||
0ed661d5 | 1580 | ptr = (__sum16 *)(skb->data + offset); |
d1b662ad | 1581 | if (is_mmzero && !do_mforce && !*ptr) |
2f72959a | 1582 | return 0; |
91bc4822 | 1583 | |
781c53bc | 1584 | switch (flags & BPF_F_HDR_FIELD_MASK) { |
7d672345 DB |
1585 | case 0: |
1586 | if (unlikely(from != 0)) | |
1587 | return -EINVAL; | |
1588 | ||
1589 | inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo); | |
1590 | break; | |
91bc4822 AS |
1591 | case 2: |
1592 | inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); | |
1593 | break; | |
1594 | case 4: | |
1595 | inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo); | |
1596 | break; | |
1597 | default: | |
1598 | return -EINVAL; | |
1599 | } | |
1600 | ||
2f72959a DB |
1601 | if (is_mmzero && !*ptr) |
1602 | *ptr = CSUM_MANGLED_0; | |
91bc4822 AS |
1603 | return 0; |
1604 | } | |
1605 | ||
577c50aa | 1606 | static const struct bpf_func_proto bpf_l4_csum_replace_proto = { |
91bc4822 AS |
1607 | .func = bpf_l4_csum_replace, |
1608 | .gpl_only = false, | |
1609 | .ret_type = RET_INTEGER, | |
1610 | .arg1_type = ARG_PTR_TO_CTX, | |
1611 | .arg2_type = ARG_ANYTHING, | |
1612 | .arg3_type = ARG_ANYTHING, | |
1613 | .arg4_type = ARG_ANYTHING, | |
1614 | .arg5_type = ARG_ANYTHING, | |
608cd71a AS |
1615 | }; |
1616 | ||
f3694e00 DB |
1617 | BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, |
1618 | __be32 *, to, u32, to_size, __wsum, seed) | |
7d672345 | 1619 | { |
21cafc1d | 1620 | struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp); |
f3694e00 | 1621 | u32 diff_size = from_size + to_size; |
7d672345 DB |
1622 | int i, j = 0; |
1623 | ||
1624 | /* This is quite flexible, some examples: | |
1625 | * | |
1626 | * from_size == 0, to_size > 0, seed := csum --> pushing data | |
1627 | * from_size > 0, to_size == 0, seed := csum --> pulling data | |
1628 | * from_size > 0, to_size > 0, seed := 0 --> diffing data | |
1629 | * | |
1630 | * Even for diffing, from_size and to_size don't need to be equal. | |
1631 | */ | |
1632 | if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) || | |
1633 | diff_size > sizeof(sp->diff))) | |
1634 | return -EINVAL; | |
1635 | ||
1636 | for (i = 0; i < from_size / sizeof(__be32); i++, j++) | |
1637 | sp->diff[j] = ~from[i]; | |
1638 | for (i = 0; i < to_size / sizeof(__be32); i++, j++) | |
1639 | sp->diff[j] = to[i]; | |
1640 | ||
1641 | return csum_partial(sp->diff, diff_size, seed); | |
1642 | } | |
1643 | ||
577c50aa | 1644 | static const struct bpf_func_proto bpf_csum_diff_proto = { |
7d672345 DB |
1645 | .func = bpf_csum_diff, |
1646 | .gpl_only = false, | |
36bbef52 | 1647 | .pkt_access = true, |
7d672345 | 1648 | .ret_type = RET_INTEGER, |
db1ac496 | 1649 | .arg1_type = ARG_PTR_TO_MEM_OR_NULL, |
39f19ebb | 1650 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, |
db1ac496 | 1651 | .arg3_type = ARG_PTR_TO_MEM_OR_NULL, |
39f19ebb | 1652 | .arg4_type = ARG_CONST_SIZE_OR_ZERO, |
7d672345 DB |
1653 | .arg5_type = ARG_ANYTHING, |
1654 | }; | |
1655 | ||
36bbef52 DB |
1656 | BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum) |
1657 | { | |
1658 | /* The interface is to be used in combination with bpf_csum_diff() | |
1659 | * for direct packet writes. csum rotation for alignment as well | |
1660 | * as emulating csum_sub() can be done from the eBPF program. | |
1661 | */ | |
1662 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
1663 | return (skb->csum = csum_add(skb->csum, csum)); | |
1664 | ||
1665 | return -ENOTSUPP; | |
1666 | } | |
1667 | ||
1668 | static const struct bpf_func_proto bpf_csum_update_proto = { | |
1669 | .func = bpf_csum_update, | |
1670 | .gpl_only = false, | |
1671 | .ret_type = RET_INTEGER, | |
1672 | .arg1_type = ARG_PTR_TO_CTX, | |
1673 | .arg2_type = ARG_ANYTHING, | |
1674 | }; | |
1675 | ||
a70b506e DB |
1676 | static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb) |
1677 | { | |
a70b506e DB |
1678 | return dev_forward_skb(dev, skb); |
1679 | } | |
1680 | ||
4e3264d2 MKL |
1681 | static inline int __bpf_rx_skb_no_mac(struct net_device *dev, |
1682 | struct sk_buff *skb) | |
1683 | { | |
1684 | int ret = ____dev_forward_skb(dev, skb); | |
1685 | ||
1686 | if (likely(!ret)) { | |
1687 | skb->dev = dev; | |
1688 | ret = netif_rx(skb); | |
1689 | } | |
1690 | ||
1691 | return ret; | |
1692 | } | |
1693 | ||
a70b506e DB |
1694 | static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb) |
1695 | { | |
1696 | int ret; | |
1697 | ||
1698 | if (unlikely(__this_cpu_read(xmit_recursion) > XMIT_RECURSION_LIMIT)) { | |
1699 | net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); | |
1700 | kfree_skb(skb); | |
1701 | return -ENETDOWN; | |
1702 | } | |
1703 | ||
1704 | skb->dev = dev; | |
1705 | ||
1706 | __this_cpu_inc(xmit_recursion); | |
1707 | ret = dev_queue_xmit(skb); | |
1708 | __this_cpu_dec(xmit_recursion); | |
1709 | ||
1710 | return ret; | |
1711 | } | |
1712 | ||
4e3264d2 MKL |
1713 | static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, |
1714 | u32 flags) | |
1715 | { | |
1716 | /* skb->mac_len is not set on normal egress */ | |
1717 | unsigned int mlen = skb->network_header - skb->mac_header; | |
1718 | ||
1719 | __skb_pull(skb, mlen); | |
1720 | ||
1721 | /* At ingress, the mac header has already been pulled once. | |
1722 | * At egress, skb_pospull_rcsum has to be done in case that | |
1723 | * the skb is originated from ingress (i.e. a forwarded skb) | |
1724 | * to ensure that rcsum starts at net header. | |
1725 | */ | |
1726 | if (!skb_at_tc_ingress(skb)) | |
1727 | skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); | |
1728 | skb_pop_mac_header(skb); | |
1729 | skb_reset_mac_len(skb); | |
1730 | return flags & BPF_F_INGRESS ? | |
1731 | __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); | |
1732 | } | |
1733 | ||
1734 | static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, | |
1735 | u32 flags) | |
1736 | { | |
3a0af8fd TG |
1737 | /* Verify that a link layer header is carried */ |
1738 | if (unlikely(skb->mac_header >= skb->network_header)) { | |
1739 | kfree_skb(skb); | |
1740 | return -ERANGE; | |
1741 | } | |
1742 | ||
4e3264d2 MKL |
1743 | bpf_push_mac_rcsum(skb); |
1744 | return flags & BPF_F_INGRESS ? | |
1745 | __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); | |
1746 | } | |
1747 | ||
1748 | static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, | |
1749 | u32 flags) | |
1750 | { | |
c491680f | 1751 | if (dev_is_mac_header_xmit(dev)) |
4e3264d2 | 1752 | return __bpf_redirect_common(skb, dev, flags); |
c491680f DB |
1753 | else |
1754 | return __bpf_redirect_no_mac(skb, dev, flags); | |
4e3264d2 MKL |
1755 | } |
1756 | ||
f3694e00 | 1757 | BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) |
3896d655 | 1758 | { |
3896d655 | 1759 | struct net_device *dev; |
36bbef52 DB |
1760 | struct sk_buff *clone; |
1761 | int ret; | |
3896d655 | 1762 | |
781c53bc DB |
1763 | if (unlikely(flags & ~(BPF_F_INGRESS))) |
1764 | return -EINVAL; | |
1765 | ||
3896d655 AS |
1766 | dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); |
1767 | if (unlikely(!dev)) | |
1768 | return -EINVAL; | |
1769 | ||
36bbef52 DB |
1770 | clone = skb_clone(skb, GFP_ATOMIC); |
1771 | if (unlikely(!clone)) | |
3896d655 AS |
1772 | return -ENOMEM; |
1773 | ||
36bbef52 DB |
1774 | /* For direct write, we need to keep the invariant that the skbs |
1775 | * we're dealing with need to be uncloned. Should uncloning fail | |
1776 | * here, we need to free the just generated clone to unclone once | |
1777 | * again. | |
1778 | */ | |
1779 | ret = bpf_try_make_head_writable(skb); | |
1780 | if (unlikely(ret)) { | |
1781 | kfree_skb(clone); | |
1782 | return -ENOMEM; | |
1783 | } | |
1784 | ||
4e3264d2 | 1785 | return __bpf_redirect(clone, dev, flags); |
3896d655 AS |
1786 | } |
1787 | ||
577c50aa | 1788 | static const struct bpf_func_proto bpf_clone_redirect_proto = { |
3896d655 AS |
1789 | .func = bpf_clone_redirect, |
1790 | .gpl_only = false, | |
1791 | .ret_type = RET_INTEGER, | |
1792 | .arg1_type = ARG_PTR_TO_CTX, | |
1793 | .arg2_type = ARG_ANYTHING, | |
1794 | .arg3_type = ARG_ANYTHING, | |
1795 | }; | |
1796 | ||
27b29f63 AS |
1797 | struct redirect_info { |
1798 | u32 ifindex; | |
1799 | u32 flags; | |
97f91a7c | 1800 | struct bpf_map *map; |
11393cc9 | 1801 | struct bpf_map *map_to_flush; |
7c300131 | 1802 | unsigned long map_owner; |
27b29f63 AS |
1803 | }; |
1804 | ||
1805 | static DEFINE_PER_CPU(struct redirect_info, redirect_info); | |
781c53bc | 1806 | |
f3694e00 | 1807 | BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) |
27b29f63 AS |
1808 | { |
1809 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
1810 | ||
781c53bc DB |
1811 | if (unlikely(flags & ~(BPF_F_INGRESS))) |
1812 | return TC_ACT_SHOT; | |
1813 | ||
27b29f63 AS |
1814 | ri->ifindex = ifindex; |
1815 | ri->flags = flags; | |
781c53bc | 1816 | |
27b29f63 AS |
1817 | return TC_ACT_REDIRECT; |
1818 | } | |
1819 | ||
1820 | int skb_do_redirect(struct sk_buff *skb) | |
1821 | { | |
1822 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
1823 | struct net_device *dev; | |
1824 | ||
1825 | dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->ifindex); | |
1826 | ri->ifindex = 0; | |
1827 | if (unlikely(!dev)) { | |
1828 | kfree_skb(skb); | |
1829 | return -EINVAL; | |
1830 | } | |
1831 | ||
4e3264d2 | 1832 | return __bpf_redirect(skb, dev, ri->flags); |
27b29f63 AS |
1833 | } |
1834 | ||
577c50aa | 1835 | static const struct bpf_func_proto bpf_redirect_proto = { |
27b29f63 AS |
1836 | .func = bpf_redirect, |
1837 | .gpl_only = false, | |
1838 | .ret_type = RET_INTEGER, | |
1839 | .arg1_type = ARG_ANYTHING, | |
1840 | .arg2_type = ARG_ANYTHING, | |
1841 | }; | |
1842 | ||
34f79502 JF |
1843 | BPF_CALL_4(bpf_sk_redirect_map, struct sk_buff *, skb, |
1844 | struct bpf_map *, map, u32, key, u64, flags) | |
174a79ff | 1845 | { |
34f79502 | 1846 | struct tcp_skb_cb *tcb = TCP_SKB_CB(skb); |
174a79ff | 1847 | |
bfa64075 | 1848 | /* If user passes invalid input drop the packet. */ |
174a79ff | 1849 | if (unlikely(flags)) |
bfa64075 | 1850 | return SK_DROP; |
174a79ff | 1851 | |
34f79502 JF |
1852 | tcb->bpf.key = key; |
1853 | tcb->bpf.flags = flags; | |
1854 | tcb->bpf.map = map; | |
174a79ff | 1855 | |
bfa64075 | 1856 | return SK_PASS; |
174a79ff JF |
1857 | } |
1858 | ||
34f79502 | 1859 | struct sock *do_sk_redirect_map(struct sk_buff *skb) |
174a79ff | 1860 | { |
34f79502 | 1861 | struct tcp_skb_cb *tcb = TCP_SKB_CB(skb); |
174a79ff JF |
1862 | struct sock *sk = NULL; |
1863 | ||
34f79502 JF |
1864 | if (tcb->bpf.map) { |
1865 | sk = __sock_map_lookup_elem(tcb->bpf.map, tcb->bpf.key); | |
174a79ff | 1866 | |
34f79502 JF |
1867 | tcb->bpf.key = 0; |
1868 | tcb->bpf.map = NULL; | |
174a79ff JF |
1869 | } |
1870 | ||
1871 | return sk; | |
1872 | } | |
1873 | ||
1874 | static const struct bpf_func_proto bpf_sk_redirect_map_proto = { | |
1875 | .func = bpf_sk_redirect_map, | |
1876 | .gpl_only = false, | |
1877 | .ret_type = RET_INTEGER, | |
34f79502 JF |
1878 | .arg1_type = ARG_PTR_TO_CTX, |
1879 | .arg2_type = ARG_CONST_MAP_PTR, | |
174a79ff | 1880 | .arg3_type = ARG_ANYTHING, |
34f79502 | 1881 | .arg4_type = ARG_ANYTHING, |
174a79ff JF |
1882 | }; |
1883 | ||
f3694e00 | 1884 | BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) |
8d20aabe | 1885 | { |
f3694e00 | 1886 | return task_get_classid(skb); |
8d20aabe DB |
1887 | } |
1888 | ||
1889 | static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { | |
1890 | .func = bpf_get_cgroup_classid, | |
1891 | .gpl_only = false, | |
1892 | .ret_type = RET_INTEGER, | |
1893 | .arg1_type = ARG_PTR_TO_CTX, | |
1894 | }; | |
1895 | ||
f3694e00 | 1896 | BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) |
c46646d0 | 1897 | { |
f3694e00 | 1898 | return dst_tclassid(skb); |
c46646d0 DB |
1899 | } |
1900 | ||
1901 | static const struct bpf_func_proto bpf_get_route_realm_proto = { | |
1902 | .func = bpf_get_route_realm, | |
1903 | .gpl_only = false, | |
1904 | .ret_type = RET_INTEGER, | |
1905 | .arg1_type = ARG_PTR_TO_CTX, | |
1906 | }; | |
1907 | ||
f3694e00 | 1908 | BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) |
13c5c240 DB |
1909 | { |
1910 | /* If skb_clear_hash() was called due to mangling, we can | |
1911 | * trigger SW recalculation here. Later access to hash | |
1912 | * can then use the inline skb->hash via context directly | |
1913 | * instead of calling this helper again. | |
1914 | */ | |
f3694e00 | 1915 | return skb_get_hash(skb); |
13c5c240 DB |
1916 | } |
1917 | ||
1918 | static const struct bpf_func_proto bpf_get_hash_recalc_proto = { | |
1919 | .func = bpf_get_hash_recalc, | |
1920 | .gpl_only = false, | |
1921 | .ret_type = RET_INTEGER, | |
1922 | .arg1_type = ARG_PTR_TO_CTX, | |
1923 | }; | |
1924 | ||
7a4b28c6 DB |
1925 | BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) |
1926 | { | |
1927 | /* After all direct packet write, this can be used once for | |
1928 | * triggering a lazy recalc on next skb_get_hash() invocation. | |
1929 | */ | |
1930 | skb_clear_hash(skb); | |
1931 | return 0; | |
1932 | } | |
1933 | ||
1934 | static const struct bpf_func_proto bpf_set_hash_invalid_proto = { | |
1935 | .func = bpf_set_hash_invalid, | |
1936 | .gpl_only = false, | |
1937 | .ret_type = RET_INTEGER, | |
1938 | .arg1_type = ARG_PTR_TO_CTX, | |
1939 | }; | |
1940 | ||
ded092cd DB |
1941 | BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) |
1942 | { | |
1943 | /* Set user specified hash as L4(+), so that it gets returned | |
1944 | * on skb_get_hash() call unless BPF prog later on triggers a | |
1945 | * skb_clear_hash(). | |
1946 | */ | |
1947 | __skb_set_sw_hash(skb, hash, true); | |
1948 | return 0; | |
1949 | } | |
1950 | ||
1951 | static const struct bpf_func_proto bpf_set_hash_proto = { | |
1952 | .func = bpf_set_hash, | |
1953 | .gpl_only = false, | |
1954 | .ret_type = RET_INTEGER, | |
1955 | .arg1_type = ARG_PTR_TO_CTX, | |
1956 | .arg2_type = ARG_ANYTHING, | |
1957 | }; | |
1958 | ||
f3694e00 DB |
1959 | BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, |
1960 | u16, vlan_tci) | |
4e10df9a | 1961 | { |
db58ba45 | 1962 | int ret; |
4e10df9a AS |
1963 | |
1964 | if (unlikely(vlan_proto != htons(ETH_P_8021Q) && | |
1965 | vlan_proto != htons(ETH_P_8021AD))) | |
1966 | vlan_proto = htons(ETH_P_8021Q); | |
1967 | ||
8065694e | 1968 | bpf_push_mac_rcsum(skb); |
db58ba45 | 1969 | ret = skb_vlan_push(skb, vlan_proto, vlan_tci); |
8065694e DB |
1970 | bpf_pull_mac_rcsum(skb); |
1971 | ||
6aaae2b6 | 1972 | bpf_compute_data_pointers(skb); |
db58ba45 | 1973 | return ret; |
4e10df9a AS |
1974 | } |
1975 | ||
1976 | const struct bpf_func_proto bpf_skb_vlan_push_proto = { | |
1977 | .func = bpf_skb_vlan_push, | |
1978 | .gpl_only = false, | |
1979 | .ret_type = RET_INTEGER, | |
1980 | .arg1_type = ARG_PTR_TO_CTX, | |
1981 | .arg2_type = ARG_ANYTHING, | |
1982 | .arg3_type = ARG_ANYTHING, | |
1983 | }; | |
4d9c5c53 | 1984 | EXPORT_SYMBOL_GPL(bpf_skb_vlan_push_proto); |
4e10df9a | 1985 | |
f3694e00 | 1986 | BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) |
4e10df9a | 1987 | { |
db58ba45 | 1988 | int ret; |
4e10df9a | 1989 | |
8065694e | 1990 | bpf_push_mac_rcsum(skb); |
db58ba45 | 1991 | ret = skb_vlan_pop(skb); |
8065694e DB |
1992 | bpf_pull_mac_rcsum(skb); |
1993 | ||
6aaae2b6 | 1994 | bpf_compute_data_pointers(skb); |
db58ba45 | 1995 | return ret; |
4e10df9a AS |
1996 | } |
1997 | ||
1998 | const struct bpf_func_proto bpf_skb_vlan_pop_proto = { | |
1999 | .func = bpf_skb_vlan_pop, | |
2000 | .gpl_only = false, | |
2001 | .ret_type = RET_INTEGER, | |
2002 | .arg1_type = ARG_PTR_TO_CTX, | |
2003 | }; | |
4d9c5c53 | 2004 | EXPORT_SYMBOL_GPL(bpf_skb_vlan_pop_proto); |
4e10df9a | 2005 | |
6578171a DB |
2006 | static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) |
2007 | { | |
2008 | /* Caller already did skb_cow() with len as headroom, | |
2009 | * so no need to do it here. | |
2010 | */ | |
2011 | skb_push(skb, len); | |
2012 | memmove(skb->data, skb->data + len, off); | |
2013 | memset(skb->data + off, 0, len); | |
2014 | ||
2015 | /* No skb_postpush_rcsum(skb, skb->data + off, len) | |
2016 | * needed here as it does not change the skb->csum | |
2017 | * result for checksum complete when summing over | |
2018 | * zeroed blocks. | |
2019 | */ | |
2020 | return 0; | |
2021 | } | |
2022 | ||
2023 | static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) | |
2024 | { | |
2025 | /* skb_ensure_writable() is not needed here, as we're | |
2026 | * already working on an uncloned skb. | |
2027 | */ | |
2028 | if (unlikely(!pskb_may_pull(skb, off + len))) | |
2029 | return -ENOMEM; | |
2030 | ||
2031 | skb_postpull_rcsum(skb, skb->data + off, len); | |
2032 | memmove(skb->data + len, skb->data, off); | |
2033 | __skb_pull(skb, len); | |
2034 | ||
2035 | return 0; | |
2036 | } | |
2037 | ||
2038 | static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) | |
2039 | { | |
2040 | bool trans_same = skb->transport_header == skb->network_header; | |
2041 | int ret; | |
2042 | ||
2043 | /* There's no need for __skb_push()/__skb_pull() pair to | |
2044 | * get to the start of the mac header as we're guaranteed | |
2045 | * to always start from here under eBPF. | |
2046 | */ | |
2047 | ret = bpf_skb_generic_push(skb, off, len); | |
2048 | if (likely(!ret)) { | |
2049 | skb->mac_header -= len; | |
2050 | skb->network_header -= len; | |
2051 | if (trans_same) | |
2052 | skb->transport_header = skb->network_header; | |
2053 | } | |
2054 | ||
2055 | return ret; | |
2056 | } | |
2057 | ||
2058 | static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) | |
2059 | { | |
2060 | bool trans_same = skb->transport_header == skb->network_header; | |
2061 | int ret; | |
2062 | ||
2063 | /* Same here, __skb_push()/__skb_pull() pair not needed. */ | |
2064 | ret = bpf_skb_generic_pop(skb, off, len); | |
2065 | if (likely(!ret)) { | |
2066 | skb->mac_header += len; | |
2067 | skb->network_header += len; | |
2068 | if (trans_same) | |
2069 | skb->transport_header = skb->network_header; | |
2070 | } | |
2071 | ||
2072 | return ret; | |
2073 | } | |
2074 | ||
2075 | static int bpf_skb_proto_4_to_6(struct sk_buff *skb) | |
2076 | { | |
2077 | const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); | |
0daf4349 | 2078 | u32 off = skb_mac_header_len(skb); |
6578171a DB |
2079 | int ret; |
2080 | ||
2081 | ret = skb_cow(skb, len_diff); | |
2082 | if (unlikely(ret < 0)) | |
2083 | return ret; | |
2084 | ||
2085 | ret = bpf_skb_net_hdr_push(skb, off, len_diff); | |
2086 | if (unlikely(ret < 0)) | |
2087 | return ret; | |
2088 | ||
2089 | if (skb_is_gso(skb)) { | |
880388aa DM |
2090 | /* SKB_GSO_TCPV4 needs to be changed into |
2091 | * SKB_GSO_TCPV6. | |
6578171a DB |
2092 | */ |
2093 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) { | |
2094 | skb_shinfo(skb)->gso_type &= ~SKB_GSO_TCPV4; | |
2095 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6; | |
2096 | } | |
2097 | ||
2098 | /* Due to IPv6 header, MSS needs to be downgraded. */ | |
2099 | skb_shinfo(skb)->gso_size -= len_diff; | |
2100 | /* Header must be checked, and gso_segs recomputed. */ | |
2101 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2102 | skb_shinfo(skb)->gso_segs = 0; | |
2103 | } | |
2104 | ||
2105 | skb->protocol = htons(ETH_P_IPV6); | |
2106 | skb_clear_hash(skb); | |
2107 | ||
2108 | return 0; | |
2109 | } | |
2110 | ||
2111 | static int bpf_skb_proto_6_to_4(struct sk_buff *skb) | |
2112 | { | |
2113 | const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); | |
0daf4349 | 2114 | u32 off = skb_mac_header_len(skb); |
6578171a DB |
2115 | int ret; |
2116 | ||
2117 | ret = skb_unclone(skb, GFP_ATOMIC); | |
2118 | if (unlikely(ret < 0)) | |
2119 | return ret; | |
2120 | ||
2121 | ret = bpf_skb_net_hdr_pop(skb, off, len_diff); | |
2122 | if (unlikely(ret < 0)) | |
2123 | return ret; | |
2124 | ||
2125 | if (skb_is_gso(skb)) { | |
880388aa DM |
2126 | /* SKB_GSO_TCPV6 needs to be changed into |
2127 | * SKB_GSO_TCPV4. | |
6578171a DB |
2128 | */ |
2129 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) { | |
2130 | skb_shinfo(skb)->gso_type &= ~SKB_GSO_TCPV6; | |
2131 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4; | |
2132 | } | |
2133 | ||
2134 | /* Due to IPv4 header, MSS can be upgraded. */ | |
2135 | skb_shinfo(skb)->gso_size += len_diff; | |
2136 | /* Header must be checked, and gso_segs recomputed. */ | |
2137 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2138 | skb_shinfo(skb)->gso_segs = 0; | |
2139 | } | |
2140 | ||
2141 | skb->protocol = htons(ETH_P_IP); | |
2142 | skb_clear_hash(skb); | |
2143 | ||
2144 | return 0; | |
2145 | } | |
2146 | ||
2147 | static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) | |
2148 | { | |
2149 | __be16 from_proto = skb->protocol; | |
2150 | ||
2151 | if (from_proto == htons(ETH_P_IP) && | |
2152 | to_proto == htons(ETH_P_IPV6)) | |
2153 | return bpf_skb_proto_4_to_6(skb); | |
2154 | ||
2155 | if (from_proto == htons(ETH_P_IPV6) && | |
2156 | to_proto == htons(ETH_P_IP)) | |
2157 | return bpf_skb_proto_6_to_4(skb); | |
2158 | ||
2159 | return -ENOTSUPP; | |
2160 | } | |
2161 | ||
f3694e00 DB |
2162 | BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, |
2163 | u64, flags) | |
6578171a | 2164 | { |
6578171a DB |
2165 | int ret; |
2166 | ||
2167 | if (unlikely(flags)) | |
2168 | return -EINVAL; | |
2169 | ||
2170 | /* General idea is that this helper does the basic groundwork | |
2171 | * needed for changing the protocol, and eBPF program fills the | |
2172 | * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() | |
2173 | * and other helpers, rather than passing a raw buffer here. | |
2174 | * | |
2175 | * The rationale is to keep this minimal and without a need to | |
2176 | * deal with raw packet data. F.e. even if we would pass buffers | |
2177 | * here, the program still needs to call the bpf_lX_csum_replace() | |
2178 | * helpers anyway. Plus, this way we keep also separation of | |
2179 | * concerns, since f.e. bpf_skb_store_bytes() should only take | |
2180 | * care of stores. | |
2181 | * | |
2182 | * Currently, additional options and extension header space are | |
2183 | * not supported, but flags register is reserved so we can adapt | |
2184 | * that. For offloads, we mark packet as dodgy, so that headers | |
2185 | * need to be verified first. | |
2186 | */ | |
2187 | ret = bpf_skb_proto_xlat(skb, proto); | |
6aaae2b6 | 2188 | bpf_compute_data_pointers(skb); |
6578171a DB |
2189 | return ret; |
2190 | } | |
2191 | ||
2192 | static const struct bpf_func_proto bpf_skb_change_proto_proto = { | |
2193 | .func = bpf_skb_change_proto, | |
2194 | .gpl_only = false, | |
2195 | .ret_type = RET_INTEGER, | |
2196 | .arg1_type = ARG_PTR_TO_CTX, | |
2197 | .arg2_type = ARG_ANYTHING, | |
2198 | .arg3_type = ARG_ANYTHING, | |
2199 | }; | |
2200 | ||
f3694e00 | 2201 | BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) |
d2485c42 | 2202 | { |
d2485c42 | 2203 | /* We only allow a restricted subset to be changed for now. */ |
45c7fffa DB |
2204 | if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || |
2205 | !skb_pkt_type_ok(pkt_type))) | |
d2485c42 DB |
2206 | return -EINVAL; |
2207 | ||
2208 | skb->pkt_type = pkt_type; | |
2209 | return 0; | |
2210 | } | |
2211 | ||
2212 | static const struct bpf_func_proto bpf_skb_change_type_proto = { | |
2213 | .func = bpf_skb_change_type, | |
2214 | .gpl_only = false, | |
2215 | .ret_type = RET_INTEGER, | |
2216 | .arg1_type = ARG_PTR_TO_CTX, | |
2217 | .arg2_type = ARG_ANYTHING, | |
2218 | }; | |
2219 | ||
2be7e212 DB |
2220 | static u32 bpf_skb_net_base_len(const struct sk_buff *skb) |
2221 | { | |
2222 | switch (skb->protocol) { | |
2223 | case htons(ETH_P_IP): | |
2224 | return sizeof(struct iphdr); | |
2225 | case htons(ETH_P_IPV6): | |
2226 | return sizeof(struct ipv6hdr); | |
2227 | default: | |
2228 | return ~0U; | |
2229 | } | |
2230 | } | |
2231 | ||
2232 | static int bpf_skb_net_grow(struct sk_buff *skb, u32 len_diff) | |
2233 | { | |
2234 | u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb); | |
2235 | int ret; | |
2236 | ||
2237 | ret = skb_cow(skb, len_diff); | |
2238 | if (unlikely(ret < 0)) | |
2239 | return ret; | |
2240 | ||
2241 | ret = bpf_skb_net_hdr_push(skb, off, len_diff); | |
2242 | if (unlikely(ret < 0)) | |
2243 | return ret; | |
2244 | ||
2245 | if (skb_is_gso(skb)) { | |
2246 | /* Due to header grow, MSS needs to be downgraded. */ | |
2247 | skb_shinfo(skb)->gso_size -= len_diff; | |
2248 | /* Header must be checked, and gso_segs recomputed. */ | |
2249 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2250 | skb_shinfo(skb)->gso_segs = 0; | |
2251 | } | |
2252 | ||
2253 | return 0; | |
2254 | } | |
2255 | ||
2256 | static int bpf_skb_net_shrink(struct sk_buff *skb, u32 len_diff) | |
2257 | { | |
2258 | u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb); | |
2259 | int ret; | |
2260 | ||
2261 | ret = skb_unclone(skb, GFP_ATOMIC); | |
2262 | if (unlikely(ret < 0)) | |
2263 | return ret; | |
2264 | ||
2265 | ret = bpf_skb_net_hdr_pop(skb, off, len_diff); | |
2266 | if (unlikely(ret < 0)) | |
2267 | return ret; | |
2268 | ||
2269 | if (skb_is_gso(skb)) { | |
2270 | /* Due to header shrink, MSS can be upgraded. */ | |
2271 | skb_shinfo(skb)->gso_size += len_diff; | |
2272 | /* Header must be checked, and gso_segs recomputed. */ | |
2273 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2274 | skb_shinfo(skb)->gso_segs = 0; | |
2275 | } | |
2276 | ||
2277 | return 0; | |
2278 | } | |
2279 | ||
2280 | static u32 __bpf_skb_max_len(const struct sk_buff *skb) | |
2281 | { | |
2282 | return skb->dev->mtu + skb->dev->hard_header_len; | |
2283 | } | |
2284 | ||
2285 | static int bpf_skb_adjust_net(struct sk_buff *skb, s32 len_diff) | |
2286 | { | |
2287 | bool trans_same = skb->transport_header == skb->network_header; | |
2288 | u32 len_cur, len_diff_abs = abs(len_diff); | |
2289 | u32 len_min = bpf_skb_net_base_len(skb); | |
2290 | u32 len_max = __bpf_skb_max_len(skb); | |
2291 | __be16 proto = skb->protocol; | |
2292 | bool shrink = len_diff < 0; | |
2293 | int ret; | |
2294 | ||
2295 | if (unlikely(len_diff_abs > 0xfffU)) | |
2296 | return -EFAULT; | |
2297 | if (unlikely(proto != htons(ETH_P_IP) && | |
2298 | proto != htons(ETH_P_IPV6))) | |
2299 | return -ENOTSUPP; | |
2300 | ||
2301 | len_cur = skb->len - skb_network_offset(skb); | |
2302 | if (skb_transport_header_was_set(skb) && !trans_same) | |
2303 | len_cur = skb_network_header_len(skb); | |
2304 | if ((shrink && (len_diff_abs >= len_cur || | |
2305 | len_cur - len_diff_abs < len_min)) || | |
2306 | (!shrink && (skb->len + len_diff_abs > len_max && | |
2307 | !skb_is_gso(skb)))) | |
2308 | return -ENOTSUPP; | |
2309 | ||
2310 | ret = shrink ? bpf_skb_net_shrink(skb, len_diff_abs) : | |
2311 | bpf_skb_net_grow(skb, len_diff_abs); | |
2312 | ||
6aaae2b6 | 2313 | bpf_compute_data_pointers(skb); |
e4a6a342 | 2314 | return ret; |
2be7e212 DB |
2315 | } |
2316 | ||
2317 | BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, | |
2318 | u32, mode, u64, flags) | |
2319 | { | |
2320 | if (unlikely(flags)) | |
2321 | return -EINVAL; | |
2322 | if (likely(mode == BPF_ADJ_ROOM_NET)) | |
2323 | return bpf_skb_adjust_net(skb, len_diff); | |
2324 | ||
2325 | return -ENOTSUPP; | |
2326 | } | |
2327 | ||
2328 | static const struct bpf_func_proto bpf_skb_adjust_room_proto = { | |
2329 | .func = bpf_skb_adjust_room, | |
2330 | .gpl_only = false, | |
2331 | .ret_type = RET_INTEGER, | |
2332 | .arg1_type = ARG_PTR_TO_CTX, | |
2333 | .arg2_type = ARG_ANYTHING, | |
2334 | .arg3_type = ARG_ANYTHING, | |
2335 | .arg4_type = ARG_ANYTHING, | |
2336 | }; | |
2337 | ||
5293efe6 DB |
2338 | static u32 __bpf_skb_min_len(const struct sk_buff *skb) |
2339 | { | |
2340 | u32 min_len = skb_network_offset(skb); | |
2341 | ||
2342 | if (skb_transport_header_was_set(skb)) | |
2343 | min_len = skb_transport_offset(skb); | |
2344 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
2345 | min_len = skb_checksum_start_offset(skb) + | |
2346 | skb->csum_offset + sizeof(__sum16); | |
2347 | return min_len; | |
2348 | } | |
2349 | ||
5293efe6 DB |
2350 | static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) |
2351 | { | |
2352 | unsigned int old_len = skb->len; | |
2353 | int ret; | |
2354 | ||
2355 | ret = __skb_grow_rcsum(skb, new_len); | |
2356 | if (!ret) | |
2357 | memset(skb->data + old_len, 0, new_len - old_len); | |
2358 | return ret; | |
2359 | } | |
2360 | ||
2361 | static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) | |
2362 | { | |
2363 | return __skb_trim_rcsum(skb, new_len); | |
2364 | } | |
2365 | ||
f3694e00 DB |
2366 | BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, |
2367 | u64, flags) | |
5293efe6 | 2368 | { |
5293efe6 DB |
2369 | u32 max_len = __bpf_skb_max_len(skb); |
2370 | u32 min_len = __bpf_skb_min_len(skb); | |
5293efe6 DB |
2371 | int ret; |
2372 | ||
2373 | if (unlikely(flags || new_len > max_len || new_len < min_len)) | |
2374 | return -EINVAL; | |
2375 | if (skb->encapsulation) | |
2376 | return -ENOTSUPP; | |
2377 | ||
2378 | /* The basic idea of this helper is that it's performing the | |
2379 | * needed work to either grow or trim an skb, and eBPF program | |
2380 | * rewrites the rest via helpers like bpf_skb_store_bytes(), | |
2381 | * bpf_lX_csum_replace() and others rather than passing a raw | |
2382 | * buffer here. This one is a slow path helper and intended | |
2383 | * for replies with control messages. | |
2384 | * | |
2385 | * Like in bpf_skb_change_proto(), we want to keep this rather | |
2386 | * minimal and without protocol specifics so that we are able | |
2387 | * to separate concerns as in bpf_skb_store_bytes() should only | |
2388 | * be the one responsible for writing buffers. | |
2389 | * | |
2390 | * It's really expected to be a slow path operation here for | |
2391 | * control message replies, so we're implicitly linearizing, | |
2392 | * uncloning and drop offloads from the skb by this. | |
2393 | */ | |
2394 | ret = __bpf_try_make_writable(skb, skb->len); | |
2395 | if (!ret) { | |
2396 | if (new_len > skb->len) | |
2397 | ret = bpf_skb_grow_rcsum(skb, new_len); | |
2398 | else if (new_len < skb->len) | |
2399 | ret = bpf_skb_trim_rcsum(skb, new_len); | |
2400 | if (!ret && skb_is_gso(skb)) | |
2401 | skb_gso_reset(skb); | |
2402 | } | |
2403 | ||
6aaae2b6 | 2404 | bpf_compute_data_pointers(skb); |
5293efe6 DB |
2405 | return ret; |
2406 | } | |
2407 | ||
2408 | static const struct bpf_func_proto bpf_skb_change_tail_proto = { | |
2409 | .func = bpf_skb_change_tail, | |
2410 | .gpl_only = false, | |
2411 | .ret_type = RET_INTEGER, | |
2412 | .arg1_type = ARG_PTR_TO_CTX, | |
2413 | .arg2_type = ARG_ANYTHING, | |
2414 | .arg3_type = ARG_ANYTHING, | |
2415 | }; | |
2416 | ||
3a0af8fd TG |
2417 | BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, |
2418 | u64, flags) | |
2419 | { | |
2420 | u32 max_len = __bpf_skb_max_len(skb); | |
2421 | u32 new_len = skb->len + head_room; | |
2422 | int ret; | |
2423 | ||
2424 | if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || | |
2425 | new_len < skb->len)) | |
2426 | return -EINVAL; | |
2427 | ||
2428 | ret = skb_cow(skb, head_room); | |
2429 | if (likely(!ret)) { | |
2430 | /* Idea for this helper is that we currently only | |
2431 | * allow to expand on mac header. This means that | |
2432 | * skb->protocol network header, etc, stay as is. | |
2433 | * Compared to bpf_skb_change_tail(), we're more | |
2434 | * flexible due to not needing to linearize or | |
2435 | * reset GSO. Intention for this helper is to be | |
2436 | * used by an L3 skb that needs to push mac header | |
2437 | * for redirection into L2 device. | |
2438 | */ | |
2439 | __skb_push(skb, head_room); | |
2440 | memset(skb->data, 0, head_room); | |
2441 | skb_reset_mac_header(skb); | |
2442 | } | |
2443 | ||
6aaae2b6 | 2444 | bpf_compute_data_pointers(skb); |
3a0af8fd TG |
2445 | return 0; |
2446 | } | |
2447 | ||
2448 | static const struct bpf_func_proto bpf_skb_change_head_proto = { | |
2449 | .func = bpf_skb_change_head, | |
2450 | .gpl_only = false, | |
2451 | .ret_type = RET_INTEGER, | |
2452 | .arg1_type = ARG_PTR_TO_CTX, | |
2453 | .arg2_type = ARG_ANYTHING, | |
2454 | .arg3_type = ARG_ANYTHING, | |
2455 | }; | |
2456 | ||
de8f3a83 DB |
2457 | static unsigned long xdp_get_metalen(const struct xdp_buff *xdp) |
2458 | { | |
2459 | return xdp_data_meta_unsupported(xdp) ? 0 : | |
2460 | xdp->data - xdp->data_meta; | |
2461 | } | |
2462 | ||
17bedab2 MKL |
2463 | BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) |
2464 | { | |
de8f3a83 DB |
2465 | unsigned long metalen = xdp_get_metalen(xdp); |
2466 | void *data_start = xdp->data_hard_start + metalen; | |
17bedab2 MKL |
2467 | void *data = xdp->data + offset; |
2468 | ||
de8f3a83 | 2469 | if (unlikely(data < data_start || |
17bedab2 MKL |
2470 | data > xdp->data_end - ETH_HLEN)) |
2471 | return -EINVAL; | |
2472 | ||
de8f3a83 DB |
2473 | if (metalen) |
2474 | memmove(xdp->data_meta + offset, | |
2475 | xdp->data_meta, metalen); | |
2476 | xdp->data_meta += offset; | |
17bedab2 MKL |
2477 | xdp->data = data; |
2478 | ||
2479 | return 0; | |
2480 | } | |
2481 | ||
2482 | static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { | |
2483 | .func = bpf_xdp_adjust_head, | |
2484 | .gpl_only = false, | |
2485 | .ret_type = RET_INTEGER, | |
2486 | .arg1_type = ARG_PTR_TO_CTX, | |
2487 | .arg2_type = ARG_ANYTHING, | |
2488 | }; | |
2489 | ||
de8f3a83 DB |
2490 | BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset) |
2491 | { | |
2492 | void *meta = xdp->data_meta + offset; | |
2493 | unsigned long metalen = xdp->data - meta; | |
2494 | ||
2495 | if (xdp_data_meta_unsupported(xdp)) | |
2496 | return -ENOTSUPP; | |
2497 | if (unlikely(meta < xdp->data_hard_start || | |
2498 | meta > xdp->data)) | |
2499 | return -EINVAL; | |
2500 | if (unlikely((metalen & (sizeof(__u32) - 1)) || | |
2501 | (metalen > 32))) | |
2502 | return -EACCES; | |
2503 | ||
2504 | xdp->data_meta = meta; | |
2505 | ||
2506 | return 0; | |
2507 | } | |
2508 | ||
2509 | static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { | |
2510 | .func = bpf_xdp_adjust_meta, | |
2511 | .gpl_only = false, | |
2512 | .ret_type = RET_INTEGER, | |
2513 | .arg1_type = ARG_PTR_TO_CTX, | |
2514 | .arg2_type = ARG_ANYTHING, | |
2515 | }; | |
2516 | ||
11393cc9 JF |
2517 | static int __bpf_tx_xdp(struct net_device *dev, |
2518 | struct bpf_map *map, | |
2519 | struct xdp_buff *xdp, | |
2520 | u32 index) | |
814abfab | 2521 | { |
11393cc9 JF |
2522 | int err; |
2523 | ||
2524 | if (!dev->netdev_ops->ndo_xdp_xmit) { | |
11393cc9 | 2525 | return -EOPNOTSUPP; |
814abfab | 2526 | } |
11393cc9 JF |
2527 | |
2528 | err = dev->netdev_ops->ndo_xdp_xmit(dev, xdp); | |
2529 | if (err) | |
2530 | return err; | |
9c270af3 JDB |
2531 | dev->netdev_ops->ndo_xdp_flush(dev); |
2532 | return 0; | |
2533 | } | |
2534 | ||
2535 | static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd, | |
2536 | struct bpf_map *map, | |
2537 | struct xdp_buff *xdp, | |
2538 | u32 index) | |
2539 | { | |
2540 | int err; | |
2541 | ||
2542 | if (map->map_type == BPF_MAP_TYPE_DEVMAP) { | |
2543 | struct net_device *dev = fwd; | |
2544 | ||
2545 | if (!dev->netdev_ops->ndo_xdp_xmit) | |
2546 | return -EOPNOTSUPP; | |
2547 | ||
2548 | err = dev->netdev_ops->ndo_xdp_xmit(dev, xdp); | |
2549 | if (err) | |
2550 | return err; | |
11393cc9 | 2551 | __dev_map_insert_ctx(map, index); |
9c270af3 JDB |
2552 | |
2553 | } else if (map->map_type == BPF_MAP_TYPE_CPUMAP) { | |
2554 | struct bpf_cpu_map_entry *rcpu = fwd; | |
2555 | ||
2556 | err = cpu_map_enqueue(rcpu, xdp, dev_rx); | |
2557 | if (err) | |
2558 | return err; | |
2559 | __cpu_map_insert_ctx(map, index); | |
2560 | } | |
e4a8e817 | 2561 | return 0; |
814abfab JF |
2562 | } |
2563 | ||
11393cc9 JF |
2564 | void xdp_do_flush_map(void) |
2565 | { | |
2566 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
2567 | struct bpf_map *map = ri->map_to_flush; | |
2568 | ||
11393cc9 | 2569 | ri->map_to_flush = NULL; |
9c270af3 JDB |
2570 | if (map) { |
2571 | switch (map->map_type) { | |
2572 | case BPF_MAP_TYPE_DEVMAP: | |
2573 | __dev_map_flush(map); | |
2574 | break; | |
2575 | case BPF_MAP_TYPE_CPUMAP: | |
2576 | __cpu_map_flush(map); | |
2577 | break; | |
2578 | default: | |
2579 | break; | |
2580 | } | |
2581 | } | |
11393cc9 JF |
2582 | } |
2583 | EXPORT_SYMBOL_GPL(xdp_do_flush_map); | |
2584 | ||
9c270af3 JDB |
2585 | static void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index) |
2586 | { | |
2587 | switch (map->map_type) { | |
2588 | case BPF_MAP_TYPE_DEVMAP: | |
2589 | return __dev_map_lookup_elem(map, index); | |
2590 | case BPF_MAP_TYPE_CPUMAP: | |
2591 | return __cpu_map_lookup_elem(map, index); | |
2592 | default: | |
2593 | return NULL; | |
2594 | } | |
2595 | } | |
2596 | ||
7c300131 DB |
2597 | static inline bool xdp_map_invalid(const struct bpf_prog *xdp_prog, |
2598 | unsigned long aux) | |
2599 | { | |
2600 | return (unsigned long)xdp_prog->aux != aux; | |
2601 | } | |
2602 | ||
e4a8e817 DB |
2603 | static int xdp_do_redirect_map(struct net_device *dev, struct xdp_buff *xdp, |
2604 | struct bpf_prog *xdp_prog) | |
97f91a7c JF |
2605 | { |
2606 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
7c300131 | 2607 | unsigned long map_owner = ri->map_owner; |
97f91a7c | 2608 | struct bpf_map *map = ri->map; |
11393cc9 | 2609 | u32 index = ri->ifindex; |
9c270af3 | 2610 | void *fwd = NULL; |
4c03bdd7 | 2611 | int err; |
97f91a7c JF |
2612 | |
2613 | ri->ifindex = 0; | |
2614 | ri->map = NULL; | |
7c300131 | 2615 | ri->map_owner = 0; |
109980b8 | 2616 | |
7c300131 | 2617 | if (unlikely(xdp_map_invalid(xdp_prog, map_owner))) { |
96c5508e JDB |
2618 | err = -EFAULT; |
2619 | map = NULL; | |
2620 | goto err; | |
2621 | } | |
97f91a7c | 2622 | |
9c270af3 | 2623 | fwd = __xdp_map_lookup_elem(map, index); |
4c03bdd7 JDB |
2624 | if (!fwd) { |
2625 | err = -EINVAL; | |
f5836ca5 | 2626 | goto err; |
4c03bdd7 | 2627 | } |
e4a8e817 | 2628 | if (ri->map_to_flush && ri->map_to_flush != map) |
11393cc9 JF |
2629 | xdp_do_flush_map(); |
2630 | ||
9c270af3 | 2631 | err = __bpf_tx_xdp_map(dev, fwd, map, xdp, index); |
f5836ca5 JDB |
2632 | if (unlikely(err)) |
2633 | goto err; | |
2634 | ||
2635 | ri->map_to_flush = map; | |
59a30896 | 2636 | _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); |
f5836ca5 JDB |
2637 | return 0; |
2638 | err: | |
59a30896 | 2639 | _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); |
97f91a7c JF |
2640 | return err; |
2641 | } | |
2642 | ||
5acaee0a JF |
2643 | int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, |
2644 | struct bpf_prog *xdp_prog) | |
814abfab JF |
2645 | { |
2646 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
5acaee0a | 2647 | struct net_device *fwd; |
eb48d682 | 2648 | u32 index = ri->ifindex; |
4c03bdd7 | 2649 | int err; |
814abfab | 2650 | |
97f91a7c JF |
2651 | if (ri->map) |
2652 | return xdp_do_redirect_map(dev, xdp, xdp_prog); | |
2653 | ||
eb48d682 | 2654 | fwd = dev_get_by_index_rcu(dev_net(dev), index); |
814abfab | 2655 | ri->ifindex = 0; |
5acaee0a | 2656 | if (unlikely(!fwd)) { |
4c03bdd7 | 2657 | err = -EINVAL; |
f5836ca5 | 2658 | goto err; |
814abfab JF |
2659 | } |
2660 | ||
4c03bdd7 | 2661 | err = __bpf_tx_xdp(fwd, NULL, xdp, 0); |
f5836ca5 JDB |
2662 | if (unlikely(err)) |
2663 | goto err; | |
2664 | ||
2665 | _trace_xdp_redirect(dev, xdp_prog, index); | |
2666 | return 0; | |
2667 | err: | |
2668 | _trace_xdp_redirect_err(dev, xdp_prog, index, err); | |
4c03bdd7 | 2669 | return err; |
814abfab JF |
2670 | } |
2671 | EXPORT_SYMBOL_GPL(xdp_do_redirect); | |
2672 | ||
9c270af3 JDB |
2673 | static int __xdp_generic_ok_fwd_dev(struct sk_buff *skb, struct net_device *fwd) |
2674 | { | |
2675 | unsigned int len; | |
2676 | ||
2677 | if (unlikely(!(fwd->flags & IFF_UP))) | |
2678 | return -ENETDOWN; | |
2679 | ||
2680 | len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN; | |
2681 | if (skb->len > len) | |
2682 | return -EMSGSIZE; | |
2683 | ||
2684 | return 0; | |
2685 | } | |
2686 | ||
2687 | int xdp_do_generic_redirect_map(struct net_device *dev, struct sk_buff *skb, | |
2688 | struct bpf_prog *xdp_prog) | |
6103aa96 JF |
2689 | { |
2690 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
7c300131 | 2691 | unsigned long map_owner = ri->map_owner; |
96c5508e JDB |
2692 | struct bpf_map *map = ri->map; |
2693 | struct net_device *fwd = NULL; | |
eb48d682 | 2694 | u32 index = ri->ifindex; |
2facaad6 | 2695 | int err = 0; |
6103aa96 | 2696 | |
6103aa96 | 2697 | ri->ifindex = 0; |
96c5508e | 2698 | ri->map = NULL; |
7c300131 | 2699 | ri->map_owner = 0; |
96c5508e | 2700 | |
9c270af3 JDB |
2701 | if (unlikely(xdp_map_invalid(xdp_prog, map_owner))) { |
2702 | err = -EFAULT; | |
2703 | map = NULL; | |
2704 | goto err; | |
96c5508e | 2705 | } |
9c270af3 | 2706 | fwd = __xdp_map_lookup_elem(map, index); |
2facaad6 JDB |
2707 | if (unlikely(!fwd)) { |
2708 | err = -EINVAL; | |
f5836ca5 | 2709 | goto err; |
6103aa96 JF |
2710 | } |
2711 | ||
9c270af3 JDB |
2712 | if (map->map_type == BPF_MAP_TYPE_DEVMAP) { |
2713 | if (unlikely((err = __xdp_generic_ok_fwd_dev(skb, fwd)))) | |
2714 | goto err; | |
2715 | skb->dev = fwd; | |
2716 | } else { | |
2717 | /* TODO: Handle BPF_MAP_TYPE_CPUMAP */ | |
2718 | err = -EBADRQC; | |
f5836ca5 | 2719 | goto err; |
2facaad6 | 2720 | } |
6103aa96 | 2721 | |
9c270af3 JDB |
2722 | _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); |
2723 | return 0; | |
2724 | err: | |
2725 | _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); | |
2726 | return err; | |
2727 | } | |
2728 | ||
2729 | int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb, | |
2730 | struct bpf_prog *xdp_prog) | |
2731 | { | |
2732 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
2733 | u32 index = ri->ifindex; | |
2734 | struct net_device *fwd; | |
2735 | int err = 0; | |
2736 | ||
2737 | if (ri->map) | |
2738 | return xdp_do_generic_redirect_map(dev, skb, xdp_prog); | |
2739 | ||
2740 | ri->ifindex = 0; | |
2741 | fwd = dev_get_by_index_rcu(dev_net(dev), index); | |
2742 | if (unlikely(!fwd)) { | |
2743 | err = -EINVAL; | |
f5836ca5 | 2744 | goto err; |
2facaad6 JDB |
2745 | } |
2746 | ||
9c270af3 JDB |
2747 | if (unlikely((err = __xdp_generic_ok_fwd_dev(skb, fwd)))) |
2748 | goto err; | |
2749 | ||
2facaad6 | 2750 | skb->dev = fwd; |
9c270af3 | 2751 | _trace_xdp_redirect(dev, xdp_prog, index); |
f5836ca5 JDB |
2752 | return 0; |
2753 | err: | |
9c270af3 | 2754 | _trace_xdp_redirect_err(dev, xdp_prog, index, err); |
2facaad6 | 2755 | return err; |
6103aa96 JF |
2756 | } |
2757 | EXPORT_SYMBOL_GPL(xdp_do_generic_redirect); | |
2758 | ||
814abfab JF |
2759 | BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) |
2760 | { | |
2761 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
2762 | ||
2763 | if (unlikely(flags)) | |
2764 | return XDP_ABORTED; | |
2765 | ||
2766 | ri->ifindex = ifindex; | |
2767 | ri->flags = flags; | |
109980b8 | 2768 | ri->map = NULL; |
7c300131 | 2769 | ri->map_owner = 0; |
e4a8e817 | 2770 | |
814abfab JF |
2771 | return XDP_REDIRECT; |
2772 | } | |
2773 | ||
2774 | static const struct bpf_func_proto bpf_xdp_redirect_proto = { | |
2775 | .func = bpf_xdp_redirect, | |
2776 | .gpl_only = false, | |
2777 | .ret_type = RET_INTEGER, | |
2778 | .arg1_type = ARG_ANYTHING, | |
2779 | .arg2_type = ARG_ANYTHING, | |
2780 | }; | |
2781 | ||
109980b8 | 2782 | BPF_CALL_4(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex, u64, flags, |
7c300131 | 2783 | unsigned long, map_owner) |
e4a8e817 DB |
2784 | { |
2785 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
2786 | ||
2787 | if (unlikely(flags)) | |
2788 | return XDP_ABORTED; | |
2789 | ||
2790 | ri->ifindex = ifindex; | |
2791 | ri->flags = flags; | |
2792 | ri->map = map; | |
109980b8 | 2793 | ri->map_owner = map_owner; |
e4a8e817 DB |
2794 | |
2795 | return XDP_REDIRECT; | |
2796 | } | |
2797 | ||
109980b8 DB |
2798 | /* Note, arg4 is hidden from users and populated by the verifier |
2799 | * with the right pointer. | |
2800 | */ | |
e4a8e817 DB |
2801 | static const struct bpf_func_proto bpf_xdp_redirect_map_proto = { |
2802 | .func = bpf_xdp_redirect_map, | |
2803 | .gpl_only = false, | |
2804 | .ret_type = RET_INTEGER, | |
2805 | .arg1_type = ARG_CONST_MAP_PTR, | |
2806 | .arg2_type = ARG_ANYTHING, | |
2807 | .arg3_type = ARG_ANYTHING, | |
2808 | }; | |
2809 | ||
17bedab2 | 2810 | bool bpf_helper_changes_pkt_data(void *func) |
4e10df9a | 2811 | { |
36bbef52 DB |
2812 | if (func == bpf_skb_vlan_push || |
2813 | func == bpf_skb_vlan_pop || | |
2814 | func == bpf_skb_store_bytes || | |
2815 | func == bpf_skb_change_proto || | |
3a0af8fd | 2816 | func == bpf_skb_change_head || |
36bbef52 | 2817 | func == bpf_skb_change_tail || |
2be7e212 | 2818 | func == bpf_skb_adjust_room || |
36bbef52 | 2819 | func == bpf_skb_pull_data || |
41703a73 | 2820 | func == bpf_clone_redirect || |
36bbef52 | 2821 | func == bpf_l3_csum_replace || |
17bedab2 | 2822 | func == bpf_l4_csum_replace || |
de8f3a83 DB |
2823 | func == bpf_xdp_adjust_head || |
2824 | func == bpf_xdp_adjust_meta) | |
3697649f DB |
2825 | return true; |
2826 | ||
4e10df9a AS |
2827 | return false; |
2828 | } | |
2829 | ||
555c8a86 | 2830 | static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, |
aa7145c1 | 2831 | unsigned long off, unsigned long len) |
555c8a86 | 2832 | { |
aa7145c1 | 2833 | void *ptr = skb_header_pointer(skb, off, len, dst_buff); |
555c8a86 DB |
2834 | |
2835 | if (unlikely(!ptr)) | |
2836 | return len; | |
2837 | if (ptr != dst_buff) | |
2838 | memcpy(dst_buff, ptr, len); | |
2839 | ||
2840 | return 0; | |
2841 | } | |
2842 | ||
f3694e00 DB |
2843 | BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, |
2844 | u64, flags, void *, meta, u64, meta_size) | |
555c8a86 | 2845 | { |
555c8a86 | 2846 | u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; |
555c8a86 DB |
2847 | |
2848 | if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) | |
2849 | return -EINVAL; | |
2850 | if (unlikely(skb_size > skb->len)) | |
2851 | return -EFAULT; | |
2852 | ||
2853 | return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, | |
2854 | bpf_skb_copy); | |
2855 | } | |
2856 | ||
2857 | static const struct bpf_func_proto bpf_skb_event_output_proto = { | |
2858 | .func = bpf_skb_event_output, | |
2859 | .gpl_only = true, | |
2860 | .ret_type = RET_INTEGER, | |
2861 | .arg1_type = ARG_PTR_TO_CTX, | |
2862 | .arg2_type = ARG_CONST_MAP_PTR, | |
2863 | .arg3_type = ARG_ANYTHING, | |
39f19ebb AS |
2864 | .arg4_type = ARG_PTR_TO_MEM, |
2865 | .arg5_type = ARG_CONST_SIZE, | |
555c8a86 DB |
2866 | }; |
2867 | ||
c6c33454 DB |
2868 | static unsigned short bpf_tunnel_key_af(u64 flags) |
2869 | { | |
2870 | return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; | |
2871 | } | |
2872 | ||
f3694e00 DB |
2873 | BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, |
2874 | u32, size, u64, flags) | |
d3aa45ce | 2875 | { |
c6c33454 DB |
2876 | const struct ip_tunnel_info *info = skb_tunnel_info(skb); |
2877 | u8 compat[sizeof(struct bpf_tunnel_key)]; | |
074f528e DB |
2878 | void *to_orig = to; |
2879 | int err; | |
d3aa45ce | 2880 | |
074f528e DB |
2881 | if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) { |
2882 | err = -EINVAL; | |
2883 | goto err_clear; | |
2884 | } | |
2885 | if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { | |
2886 | err = -EPROTO; | |
2887 | goto err_clear; | |
2888 | } | |
c6c33454 | 2889 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) { |
074f528e | 2890 | err = -EINVAL; |
c6c33454 | 2891 | switch (size) { |
4018ab18 | 2892 | case offsetof(struct bpf_tunnel_key, tunnel_label): |
c0e760c9 | 2893 | case offsetof(struct bpf_tunnel_key, tunnel_ext): |
4018ab18 | 2894 | goto set_compat; |
c6c33454 DB |
2895 | case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): |
2896 | /* Fixup deprecated structure layouts here, so we have | |
2897 | * a common path later on. | |
2898 | */ | |
2899 | if (ip_tunnel_info_af(info) != AF_INET) | |
074f528e | 2900 | goto err_clear; |
4018ab18 | 2901 | set_compat: |
c6c33454 DB |
2902 | to = (struct bpf_tunnel_key *)compat; |
2903 | break; | |
2904 | default: | |
074f528e | 2905 | goto err_clear; |
c6c33454 DB |
2906 | } |
2907 | } | |
d3aa45ce AS |
2908 | |
2909 | to->tunnel_id = be64_to_cpu(info->key.tun_id); | |
c6c33454 DB |
2910 | to->tunnel_tos = info->key.tos; |
2911 | to->tunnel_ttl = info->key.ttl; | |
2912 | ||
4018ab18 | 2913 | if (flags & BPF_F_TUNINFO_IPV6) { |
c6c33454 DB |
2914 | memcpy(to->remote_ipv6, &info->key.u.ipv6.src, |
2915 | sizeof(to->remote_ipv6)); | |
4018ab18 DB |
2916 | to->tunnel_label = be32_to_cpu(info->key.label); |
2917 | } else { | |
c6c33454 | 2918 | to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); |
4018ab18 | 2919 | } |
c6c33454 DB |
2920 | |
2921 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) | |
074f528e | 2922 | memcpy(to_orig, to, size); |
d3aa45ce AS |
2923 | |
2924 | return 0; | |
074f528e DB |
2925 | err_clear: |
2926 | memset(to_orig, 0, size); | |
2927 | return err; | |
d3aa45ce AS |
2928 | } |
2929 | ||
577c50aa | 2930 | static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { |
d3aa45ce AS |
2931 | .func = bpf_skb_get_tunnel_key, |
2932 | .gpl_only = false, | |
2933 | .ret_type = RET_INTEGER, | |
2934 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
2935 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, |
2936 | .arg3_type = ARG_CONST_SIZE, | |
d3aa45ce AS |
2937 | .arg4_type = ARG_ANYTHING, |
2938 | }; | |
2939 | ||
f3694e00 | 2940 | BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) |
14ca0751 | 2941 | { |
14ca0751 | 2942 | const struct ip_tunnel_info *info = skb_tunnel_info(skb); |
074f528e | 2943 | int err; |
14ca0751 DB |
2944 | |
2945 | if (unlikely(!info || | |
074f528e DB |
2946 | !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { |
2947 | err = -ENOENT; | |
2948 | goto err_clear; | |
2949 | } | |
2950 | if (unlikely(size < info->options_len)) { | |
2951 | err = -ENOMEM; | |
2952 | goto err_clear; | |
2953 | } | |
14ca0751 DB |
2954 | |
2955 | ip_tunnel_info_opts_get(to, info); | |
074f528e DB |
2956 | if (size > info->options_len) |
2957 | memset(to + info->options_len, 0, size - info->options_len); | |
14ca0751 DB |
2958 | |
2959 | return info->options_len; | |
074f528e DB |
2960 | err_clear: |
2961 | memset(to, 0, size); | |
2962 | return err; | |
14ca0751 DB |
2963 | } |
2964 | ||
2965 | static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { | |
2966 | .func = bpf_skb_get_tunnel_opt, | |
2967 | .gpl_only = false, | |
2968 | .ret_type = RET_INTEGER, | |
2969 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
2970 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, |
2971 | .arg3_type = ARG_CONST_SIZE, | |
14ca0751 DB |
2972 | }; |
2973 | ||
d3aa45ce AS |
2974 | static struct metadata_dst __percpu *md_dst; |
2975 | ||
f3694e00 DB |
2976 | BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, |
2977 | const struct bpf_tunnel_key *, from, u32, size, u64, flags) | |
d3aa45ce | 2978 | { |
d3aa45ce | 2979 | struct metadata_dst *md = this_cpu_ptr(md_dst); |
c6c33454 | 2980 | u8 compat[sizeof(struct bpf_tunnel_key)]; |
d3aa45ce AS |
2981 | struct ip_tunnel_info *info; |
2982 | ||
22080870 DB |
2983 | if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | |
2984 | BPF_F_DONT_FRAGMENT))) | |
d3aa45ce | 2985 | return -EINVAL; |
c6c33454 DB |
2986 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) { |
2987 | switch (size) { | |
4018ab18 | 2988 | case offsetof(struct bpf_tunnel_key, tunnel_label): |
c0e760c9 | 2989 | case offsetof(struct bpf_tunnel_key, tunnel_ext): |
c6c33454 DB |
2990 | case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): |
2991 | /* Fixup deprecated structure layouts here, so we have | |
2992 | * a common path later on. | |
2993 | */ | |
2994 | memcpy(compat, from, size); | |
2995 | memset(compat + size, 0, sizeof(compat) - size); | |
f3694e00 | 2996 | from = (const struct bpf_tunnel_key *) compat; |
c6c33454 DB |
2997 | break; |
2998 | default: | |
2999 | return -EINVAL; | |
3000 | } | |
3001 | } | |
c0e760c9 DB |
3002 | if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || |
3003 | from->tunnel_ext)) | |
4018ab18 | 3004 | return -EINVAL; |
d3aa45ce AS |
3005 | |
3006 | skb_dst_drop(skb); | |
3007 | dst_hold((struct dst_entry *) md); | |
3008 | skb_dst_set(skb, (struct dst_entry *) md); | |
3009 | ||
3010 | info = &md->u.tun_info; | |
3011 | info->mode = IP_TUNNEL_INFO_TX; | |
c6c33454 | 3012 | |
db3c6139 | 3013 | info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; |
22080870 DB |
3014 | if (flags & BPF_F_DONT_FRAGMENT) |
3015 | info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; | |
3016 | ||
d3aa45ce | 3017 | info->key.tun_id = cpu_to_be64(from->tunnel_id); |
c6c33454 DB |
3018 | info->key.tos = from->tunnel_tos; |
3019 | info->key.ttl = from->tunnel_ttl; | |
3020 | ||
3021 | if (flags & BPF_F_TUNINFO_IPV6) { | |
3022 | info->mode |= IP_TUNNEL_INFO_IPV6; | |
3023 | memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, | |
3024 | sizeof(from->remote_ipv6)); | |
4018ab18 DB |
3025 | info->key.label = cpu_to_be32(from->tunnel_label) & |
3026 | IPV6_FLOWLABEL_MASK; | |
c6c33454 DB |
3027 | } else { |
3028 | info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); | |
2da897e5 DB |
3029 | if (flags & BPF_F_ZERO_CSUM_TX) |
3030 | info->key.tun_flags &= ~TUNNEL_CSUM; | |
c6c33454 | 3031 | } |
d3aa45ce AS |
3032 | |
3033 | return 0; | |
3034 | } | |
3035 | ||
577c50aa | 3036 | static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { |
d3aa45ce AS |
3037 | .func = bpf_skb_set_tunnel_key, |
3038 | .gpl_only = false, | |
3039 | .ret_type = RET_INTEGER, | |
3040 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
3041 | .arg2_type = ARG_PTR_TO_MEM, |
3042 | .arg3_type = ARG_CONST_SIZE, | |
d3aa45ce AS |
3043 | .arg4_type = ARG_ANYTHING, |
3044 | }; | |
3045 | ||
f3694e00 DB |
3046 | BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, |
3047 | const u8 *, from, u32, size) | |
14ca0751 | 3048 | { |
14ca0751 DB |
3049 | struct ip_tunnel_info *info = skb_tunnel_info(skb); |
3050 | const struct metadata_dst *md = this_cpu_ptr(md_dst); | |
3051 | ||
3052 | if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) | |
3053 | return -EINVAL; | |
fca5fdf6 | 3054 | if (unlikely(size > IP_TUNNEL_OPTS_MAX)) |
14ca0751 DB |
3055 | return -ENOMEM; |
3056 | ||
3057 | ip_tunnel_info_opts_set(info, from, size); | |
3058 | ||
3059 | return 0; | |
3060 | } | |
3061 | ||
3062 | static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { | |
3063 | .func = bpf_skb_set_tunnel_opt, | |
3064 | .gpl_only = false, | |
3065 | .ret_type = RET_INTEGER, | |
3066 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
3067 | .arg2_type = ARG_PTR_TO_MEM, |
3068 | .arg3_type = ARG_CONST_SIZE, | |
14ca0751 DB |
3069 | }; |
3070 | ||
3071 | static const struct bpf_func_proto * | |
3072 | bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) | |
d3aa45ce AS |
3073 | { |
3074 | if (!md_dst) { | |
d66f2b91 JK |
3075 | struct metadata_dst __percpu *tmp; |
3076 | ||
3077 | tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, | |
3078 | METADATA_IP_TUNNEL, | |
3079 | GFP_KERNEL); | |
3080 | if (!tmp) | |
d3aa45ce | 3081 | return NULL; |
d66f2b91 JK |
3082 | if (cmpxchg(&md_dst, NULL, tmp)) |
3083 | metadata_dst_free_percpu(tmp); | |
d3aa45ce | 3084 | } |
14ca0751 DB |
3085 | |
3086 | switch (which) { | |
3087 | case BPF_FUNC_skb_set_tunnel_key: | |
3088 | return &bpf_skb_set_tunnel_key_proto; | |
3089 | case BPF_FUNC_skb_set_tunnel_opt: | |
3090 | return &bpf_skb_set_tunnel_opt_proto; | |
3091 | default: | |
3092 | return NULL; | |
3093 | } | |
d3aa45ce AS |
3094 | } |
3095 | ||
f3694e00 DB |
3096 | BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, |
3097 | u32, idx) | |
4a482f34 | 3098 | { |
4a482f34 MKL |
3099 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
3100 | struct cgroup *cgrp; | |
3101 | struct sock *sk; | |
4a482f34 | 3102 | |
2d48c5f9 | 3103 | sk = skb_to_full_sk(skb); |
4a482f34 MKL |
3104 | if (!sk || !sk_fullsock(sk)) |
3105 | return -ENOENT; | |
f3694e00 | 3106 | if (unlikely(idx >= array->map.max_entries)) |
4a482f34 MKL |
3107 | return -E2BIG; |
3108 | ||
f3694e00 | 3109 | cgrp = READ_ONCE(array->ptrs[idx]); |
4a482f34 MKL |
3110 | if (unlikely(!cgrp)) |
3111 | return -EAGAIN; | |
3112 | ||
54fd9c2d | 3113 | return sk_under_cgroup_hierarchy(sk, cgrp); |
4a482f34 MKL |
3114 | } |
3115 | ||
747ea55e DB |
3116 | static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { |
3117 | .func = bpf_skb_under_cgroup, | |
4a482f34 MKL |
3118 | .gpl_only = false, |
3119 | .ret_type = RET_INTEGER, | |
3120 | .arg1_type = ARG_PTR_TO_CTX, | |
3121 | .arg2_type = ARG_CONST_MAP_PTR, | |
3122 | .arg3_type = ARG_ANYTHING, | |
3123 | }; | |
4a482f34 | 3124 | |
4de16969 DB |
3125 | static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff, |
3126 | unsigned long off, unsigned long len) | |
3127 | { | |
3128 | memcpy(dst_buff, src_buff + off, len); | |
3129 | return 0; | |
3130 | } | |
3131 | ||
f3694e00 DB |
3132 | BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, |
3133 | u64, flags, void *, meta, u64, meta_size) | |
4de16969 | 3134 | { |
4de16969 | 3135 | u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; |
4de16969 DB |
3136 | |
3137 | if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) | |
3138 | return -EINVAL; | |
3139 | if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data))) | |
3140 | return -EFAULT; | |
3141 | ||
9c471370 MKL |
3142 | return bpf_event_output(map, flags, meta, meta_size, xdp->data, |
3143 | xdp_size, bpf_xdp_copy); | |
4de16969 DB |
3144 | } |
3145 | ||
3146 | static const struct bpf_func_proto bpf_xdp_event_output_proto = { | |
3147 | .func = bpf_xdp_event_output, | |
3148 | .gpl_only = true, | |
3149 | .ret_type = RET_INTEGER, | |
3150 | .arg1_type = ARG_PTR_TO_CTX, | |
3151 | .arg2_type = ARG_CONST_MAP_PTR, | |
3152 | .arg3_type = ARG_ANYTHING, | |
39f19ebb AS |
3153 | .arg4_type = ARG_PTR_TO_MEM, |
3154 | .arg5_type = ARG_CONST_SIZE, | |
4de16969 DB |
3155 | }; |
3156 | ||
91b8270f CF |
3157 | BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) |
3158 | { | |
3159 | return skb->sk ? sock_gen_cookie(skb->sk) : 0; | |
3160 | } | |
3161 | ||
3162 | static const struct bpf_func_proto bpf_get_socket_cookie_proto = { | |
3163 | .func = bpf_get_socket_cookie, | |
3164 | .gpl_only = false, | |
3165 | .ret_type = RET_INTEGER, | |
3166 | .arg1_type = ARG_PTR_TO_CTX, | |
3167 | }; | |
3168 | ||
6acc5c29 CF |
3169 | BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) |
3170 | { | |
3171 | struct sock *sk = sk_to_full_sk(skb->sk); | |
3172 | kuid_t kuid; | |
3173 | ||
3174 | if (!sk || !sk_fullsock(sk)) | |
3175 | return overflowuid; | |
3176 | kuid = sock_net_uid(sock_net(sk), sk); | |
3177 | return from_kuid_munged(sock_net(sk)->user_ns, kuid); | |
3178 | } | |
3179 | ||
3180 | static const struct bpf_func_proto bpf_get_socket_uid_proto = { | |
3181 | .func = bpf_get_socket_uid, | |
3182 | .gpl_only = false, | |
3183 | .ret_type = RET_INTEGER, | |
3184 | .arg1_type = ARG_PTR_TO_CTX, | |
3185 | }; | |
3186 | ||
8c4b4c7e LB |
3187 | BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, |
3188 | int, level, int, optname, char *, optval, int, optlen) | |
3189 | { | |
3190 | struct sock *sk = bpf_sock->sk; | |
3191 | int ret = 0; | |
3192 | int val; | |
3193 | ||
3194 | if (!sk_fullsock(sk)) | |
3195 | return -EINVAL; | |
3196 | ||
3197 | if (level == SOL_SOCKET) { | |
3198 | if (optlen != sizeof(int)) | |
3199 | return -EINVAL; | |
3200 | val = *((int *)optval); | |
3201 | ||
3202 | /* Only some socketops are supported */ | |
3203 | switch (optname) { | |
3204 | case SO_RCVBUF: | |
3205 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
3206 | sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); | |
3207 | break; | |
3208 | case SO_SNDBUF: | |
3209 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
3210 | sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); | |
3211 | break; | |
3212 | case SO_MAX_PACING_RATE: | |
3213 | sk->sk_max_pacing_rate = val; | |
3214 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, | |
3215 | sk->sk_max_pacing_rate); | |
3216 | break; | |
3217 | case SO_PRIORITY: | |
3218 | sk->sk_priority = val; | |
3219 | break; | |
3220 | case SO_RCVLOWAT: | |
3221 | if (val < 0) | |
3222 | val = INT_MAX; | |
3223 | sk->sk_rcvlowat = val ? : 1; | |
3224 | break; | |
3225 | case SO_MARK: | |
3226 | sk->sk_mark = val; | |
3227 | break; | |
3228 | default: | |
3229 | ret = -EINVAL; | |
3230 | } | |
a5192c52 | 3231 | #ifdef CONFIG_INET |
8c4b4c7e LB |
3232 | } else if (level == SOL_TCP && |
3233 | sk->sk_prot->setsockopt == tcp_setsockopt) { | |
91b5b21c LB |
3234 | if (optname == TCP_CONGESTION) { |
3235 | char name[TCP_CA_NAME_MAX]; | |
ebfa00c5 | 3236 | bool reinit = bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN; |
91b5b21c LB |
3237 | |
3238 | strncpy(name, optval, min_t(long, optlen, | |
3239 | TCP_CA_NAME_MAX-1)); | |
3240 | name[TCP_CA_NAME_MAX-1] = 0; | |
ebfa00c5 | 3241 | ret = tcp_set_congestion_control(sk, name, false, reinit); |
91b5b21c | 3242 | } else { |
fc747810 LB |
3243 | struct tcp_sock *tp = tcp_sk(sk); |
3244 | ||
3245 | if (optlen != sizeof(int)) | |
3246 | return -EINVAL; | |
3247 | ||
3248 | val = *((int *)optval); | |
3249 | /* Only some options are supported */ | |
3250 | switch (optname) { | |
3251 | case TCP_BPF_IW: | |
3252 | if (val <= 0 || tp->data_segs_out > 0) | |
3253 | ret = -EINVAL; | |
3254 | else | |
3255 | tp->snd_cwnd = val; | |
3256 | break; | |
13bf9641 LB |
3257 | case TCP_BPF_SNDCWND_CLAMP: |
3258 | if (val <= 0) { | |
3259 | ret = -EINVAL; | |
3260 | } else { | |
3261 | tp->snd_cwnd_clamp = val; | |
3262 | tp->snd_ssthresh = val; | |
3263 | } | |
6d3f06a0 | 3264 | break; |
fc747810 LB |
3265 | default: |
3266 | ret = -EINVAL; | |
3267 | } | |
91b5b21c | 3268 | } |
91b5b21c | 3269 | #endif |
8c4b4c7e LB |
3270 | } else { |
3271 | ret = -EINVAL; | |
3272 | } | |
3273 | return ret; | |
3274 | } | |
3275 | ||
3276 | static const struct bpf_func_proto bpf_setsockopt_proto = { | |
3277 | .func = bpf_setsockopt, | |
cd86d1fd | 3278 | .gpl_only = false, |
8c4b4c7e LB |
3279 | .ret_type = RET_INTEGER, |
3280 | .arg1_type = ARG_PTR_TO_CTX, | |
3281 | .arg2_type = ARG_ANYTHING, | |
3282 | .arg3_type = ARG_ANYTHING, | |
3283 | .arg4_type = ARG_PTR_TO_MEM, | |
3284 | .arg5_type = ARG_CONST_SIZE, | |
3285 | }; | |
3286 | ||
cd86d1fd LB |
3287 | BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, |
3288 | int, level, int, optname, char *, optval, int, optlen) | |
3289 | { | |
3290 | struct sock *sk = bpf_sock->sk; | |
cd86d1fd LB |
3291 | |
3292 | if (!sk_fullsock(sk)) | |
3293 | goto err_clear; | |
3294 | ||
3295 | #ifdef CONFIG_INET | |
3296 | if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) { | |
3297 | if (optname == TCP_CONGESTION) { | |
3298 | struct inet_connection_sock *icsk = inet_csk(sk); | |
3299 | ||
3300 | if (!icsk->icsk_ca_ops || optlen <= 1) | |
3301 | goto err_clear; | |
3302 | strncpy(optval, icsk->icsk_ca_ops->name, optlen); | |
3303 | optval[optlen - 1] = 0; | |
3304 | } else { | |
3305 | goto err_clear; | |
3306 | } | |
3307 | } else { | |
3308 | goto err_clear; | |
3309 | } | |
aa2bc739 | 3310 | return 0; |
cd86d1fd LB |
3311 | #endif |
3312 | err_clear: | |
3313 | memset(optval, 0, optlen); | |
3314 | return -EINVAL; | |
3315 | } | |
3316 | ||
3317 | static const struct bpf_func_proto bpf_getsockopt_proto = { | |
3318 | .func = bpf_getsockopt, | |
3319 | .gpl_only = false, | |
3320 | .ret_type = RET_INTEGER, | |
3321 | .arg1_type = ARG_PTR_TO_CTX, | |
3322 | .arg2_type = ARG_ANYTHING, | |
3323 | .arg3_type = ARG_ANYTHING, | |
3324 | .arg4_type = ARG_PTR_TO_UNINIT_MEM, | |
3325 | .arg5_type = ARG_CONST_SIZE, | |
3326 | }; | |
3327 | ||
d4052c4a | 3328 | static const struct bpf_func_proto * |
2492d3b8 | 3329 | bpf_base_func_proto(enum bpf_func_id func_id) |
89aa0758 AS |
3330 | { |
3331 | switch (func_id) { | |
3332 | case BPF_FUNC_map_lookup_elem: | |
3333 | return &bpf_map_lookup_elem_proto; | |
3334 | case BPF_FUNC_map_update_elem: | |
3335 | return &bpf_map_update_elem_proto; | |
3336 | case BPF_FUNC_map_delete_elem: | |
3337 | return &bpf_map_delete_elem_proto; | |
03e69b50 DB |
3338 | case BPF_FUNC_get_prandom_u32: |
3339 | return &bpf_get_prandom_u32_proto; | |
c04167ce | 3340 | case BPF_FUNC_get_smp_processor_id: |
80b48c44 | 3341 | return &bpf_get_raw_smp_processor_id_proto; |
2d0e30c3 DB |
3342 | case BPF_FUNC_get_numa_node_id: |
3343 | return &bpf_get_numa_node_id_proto; | |
04fd61ab AS |
3344 | case BPF_FUNC_tail_call: |
3345 | return &bpf_tail_call_proto; | |
17ca8cbf DB |
3346 | case BPF_FUNC_ktime_get_ns: |
3347 | return &bpf_ktime_get_ns_proto; | |
0756ea3e | 3348 | case BPF_FUNC_trace_printk: |
1be7f75d AS |
3349 | if (capable(CAP_SYS_ADMIN)) |
3350 | return bpf_get_trace_printk_proto(); | |
89aa0758 AS |
3351 | default: |
3352 | return NULL; | |
3353 | } | |
3354 | } | |
3355 | ||
ae2cf1c4 DA |
3356 | static const struct bpf_func_proto * |
3357 | sock_filter_func_proto(enum bpf_func_id func_id) | |
3358 | { | |
3359 | switch (func_id) { | |
3360 | /* inet and inet6 sockets are created in a process | |
3361 | * context so there is always a valid uid/gid | |
3362 | */ | |
3363 | case BPF_FUNC_get_current_uid_gid: | |
3364 | return &bpf_get_current_uid_gid_proto; | |
3365 | default: | |
3366 | return bpf_base_func_proto(func_id); | |
3367 | } | |
3368 | } | |
3369 | ||
2492d3b8 DB |
3370 | static const struct bpf_func_proto * |
3371 | sk_filter_func_proto(enum bpf_func_id func_id) | |
3372 | { | |
3373 | switch (func_id) { | |
3374 | case BPF_FUNC_skb_load_bytes: | |
3375 | return &bpf_skb_load_bytes_proto; | |
91b8270f CF |
3376 | case BPF_FUNC_get_socket_cookie: |
3377 | return &bpf_get_socket_cookie_proto; | |
6acc5c29 CF |
3378 | case BPF_FUNC_get_socket_uid: |
3379 | return &bpf_get_socket_uid_proto; | |
2492d3b8 DB |
3380 | default: |
3381 | return bpf_base_func_proto(func_id); | |
3382 | } | |
3383 | } | |
3384 | ||
608cd71a AS |
3385 | static const struct bpf_func_proto * |
3386 | tc_cls_act_func_proto(enum bpf_func_id func_id) | |
3387 | { | |
3388 | switch (func_id) { | |
3389 | case BPF_FUNC_skb_store_bytes: | |
3390 | return &bpf_skb_store_bytes_proto; | |
05c74e5e DB |
3391 | case BPF_FUNC_skb_load_bytes: |
3392 | return &bpf_skb_load_bytes_proto; | |
36bbef52 DB |
3393 | case BPF_FUNC_skb_pull_data: |
3394 | return &bpf_skb_pull_data_proto; | |
7d672345 DB |
3395 | case BPF_FUNC_csum_diff: |
3396 | return &bpf_csum_diff_proto; | |
36bbef52 DB |
3397 | case BPF_FUNC_csum_update: |
3398 | return &bpf_csum_update_proto; | |
91bc4822 AS |
3399 | case BPF_FUNC_l3_csum_replace: |
3400 | return &bpf_l3_csum_replace_proto; | |
3401 | case BPF_FUNC_l4_csum_replace: | |
3402 | return &bpf_l4_csum_replace_proto; | |
3896d655 AS |
3403 | case BPF_FUNC_clone_redirect: |
3404 | return &bpf_clone_redirect_proto; | |
8d20aabe DB |
3405 | case BPF_FUNC_get_cgroup_classid: |
3406 | return &bpf_get_cgroup_classid_proto; | |
4e10df9a AS |
3407 | case BPF_FUNC_skb_vlan_push: |
3408 | return &bpf_skb_vlan_push_proto; | |
3409 | case BPF_FUNC_skb_vlan_pop: | |
3410 | return &bpf_skb_vlan_pop_proto; | |
6578171a DB |
3411 | case BPF_FUNC_skb_change_proto: |
3412 | return &bpf_skb_change_proto_proto; | |
d2485c42 DB |
3413 | case BPF_FUNC_skb_change_type: |
3414 | return &bpf_skb_change_type_proto; | |
2be7e212 DB |
3415 | case BPF_FUNC_skb_adjust_room: |
3416 | return &bpf_skb_adjust_room_proto; | |
5293efe6 DB |
3417 | case BPF_FUNC_skb_change_tail: |
3418 | return &bpf_skb_change_tail_proto; | |
d3aa45ce AS |
3419 | case BPF_FUNC_skb_get_tunnel_key: |
3420 | return &bpf_skb_get_tunnel_key_proto; | |
3421 | case BPF_FUNC_skb_set_tunnel_key: | |
14ca0751 DB |
3422 | return bpf_get_skb_set_tunnel_proto(func_id); |
3423 | case BPF_FUNC_skb_get_tunnel_opt: | |
3424 | return &bpf_skb_get_tunnel_opt_proto; | |
3425 | case BPF_FUNC_skb_set_tunnel_opt: | |
3426 | return bpf_get_skb_set_tunnel_proto(func_id); | |
27b29f63 AS |
3427 | case BPF_FUNC_redirect: |
3428 | return &bpf_redirect_proto; | |
c46646d0 DB |
3429 | case BPF_FUNC_get_route_realm: |
3430 | return &bpf_get_route_realm_proto; | |
13c5c240 DB |
3431 | case BPF_FUNC_get_hash_recalc: |
3432 | return &bpf_get_hash_recalc_proto; | |
7a4b28c6 DB |
3433 | case BPF_FUNC_set_hash_invalid: |
3434 | return &bpf_set_hash_invalid_proto; | |
ded092cd DB |
3435 | case BPF_FUNC_set_hash: |
3436 | return &bpf_set_hash_proto; | |
bd570ff9 | 3437 | case BPF_FUNC_perf_event_output: |
555c8a86 | 3438 | return &bpf_skb_event_output_proto; |
80b48c44 DB |
3439 | case BPF_FUNC_get_smp_processor_id: |
3440 | return &bpf_get_smp_processor_id_proto; | |
747ea55e DB |
3441 | case BPF_FUNC_skb_under_cgroup: |
3442 | return &bpf_skb_under_cgroup_proto; | |
91b8270f CF |
3443 | case BPF_FUNC_get_socket_cookie: |
3444 | return &bpf_get_socket_cookie_proto; | |
6acc5c29 CF |
3445 | case BPF_FUNC_get_socket_uid: |
3446 | return &bpf_get_socket_uid_proto; | |
608cd71a | 3447 | default: |
2492d3b8 | 3448 | return bpf_base_func_proto(func_id); |
608cd71a AS |
3449 | } |
3450 | } | |
3451 | ||
6a773a15 BB |
3452 | static const struct bpf_func_proto * |
3453 | xdp_func_proto(enum bpf_func_id func_id) | |
3454 | { | |
4de16969 DB |
3455 | switch (func_id) { |
3456 | case BPF_FUNC_perf_event_output: | |
3457 | return &bpf_xdp_event_output_proto; | |
669dc4d7 DB |
3458 | case BPF_FUNC_get_smp_processor_id: |
3459 | return &bpf_get_smp_processor_id_proto; | |
17bedab2 MKL |
3460 | case BPF_FUNC_xdp_adjust_head: |
3461 | return &bpf_xdp_adjust_head_proto; | |
de8f3a83 DB |
3462 | case BPF_FUNC_xdp_adjust_meta: |
3463 | return &bpf_xdp_adjust_meta_proto; | |
814abfab JF |
3464 | case BPF_FUNC_redirect: |
3465 | return &bpf_xdp_redirect_proto; | |
97f91a7c | 3466 | case BPF_FUNC_redirect_map: |
e4a8e817 | 3467 | return &bpf_xdp_redirect_map_proto; |
4de16969 | 3468 | default: |
2492d3b8 | 3469 | return bpf_base_func_proto(func_id); |
4de16969 | 3470 | } |
6a773a15 BB |
3471 | } |
3472 | ||
3a0af8fd TG |
3473 | static const struct bpf_func_proto * |
3474 | lwt_inout_func_proto(enum bpf_func_id func_id) | |
3475 | { | |
3476 | switch (func_id) { | |
3477 | case BPF_FUNC_skb_load_bytes: | |
3478 | return &bpf_skb_load_bytes_proto; | |
3479 | case BPF_FUNC_skb_pull_data: | |
3480 | return &bpf_skb_pull_data_proto; | |
3481 | case BPF_FUNC_csum_diff: | |
3482 | return &bpf_csum_diff_proto; | |
3483 | case BPF_FUNC_get_cgroup_classid: | |
3484 | return &bpf_get_cgroup_classid_proto; | |
3485 | case BPF_FUNC_get_route_realm: | |
3486 | return &bpf_get_route_realm_proto; | |
3487 | case BPF_FUNC_get_hash_recalc: | |
3488 | return &bpf_get_hash_recalc_proto; | |
3489 | case BPF_FUNC_perf_event_output: | |
3490 | return &bpf_skb_event_output_proto; | |
3491 | case BPF_FUNC_get_smp_processor_id: | |
3492 | return &bpf_get_smp_processor_id_proto; | |
3493 | case BPF_FUNC_skb_under_cgroup: | |
3494 | return &bpf_skb_under_cgroup_proto; | |
3495 | default: | |
2492d3b8 | 3496 | return bpf_base_func_proto(func_id); |
3a0af8fd TG |
3497 | } |
3498 | } | |
3499 | ||
8c4b4c7e LB |
3500 | static const struct bpf_func_proto * |
3501 | sock_ops_func_proto(enum bpf_func_id func_id) | |
3502 | { | |
3503 | switch (func_id) { | |
3504 | case BPF_FUNC_setsockopt: | |
3505 | return &bpf_setsockopt_proto; | |
cd86d1fd LB |
3506 | case BPF_FUNC_getsockopt: |
3507 | return &bpf_getsockopt_proto; | |
174a79ff JF |
3508 | case BPF_FUNC_sock_map_update: |
3509 | return &bpf_sock_map_update_proto; | |
8c4b4c7e LB |
3510 | default: |
3511 | return bpf_base_func_proto(func_id); | |
3512 | } | |
3513 | } | |
3514 | ||
b005fd18 JF |
3515 | static const struct bpf_func_proto *sk_skb_func_proto(enum bpf_func_id func_id) |
3516 | { | |
3517 | switch (func_id) { | |
8a31db56 JF |
3518 | case BPF_FUNC_skb_store_bytes: |
3519 | return &bpf_skb_store_bytes_proto; | |
b005fd18 JF |
3520 | case BPF_FUNC_skb_load_bytes: |
3521 | return &bpf_skb_load_bytes_proto; | |
8a31db56 JF |
3522 | case BPF_FUNC_skb_pull_data: |
3523 | return &bpf_skb_pull_data_proto; | |
3524 | case BPF_FUNC_skb_change_tail: | |
3525 | return &bpf_skb_change_tail_proto; | |
3526 | case BPF_FUNC_skb_change_head: | |
3527 | return &bpf_skb_change_head_proto; | |
b005fd18 JF |
3528 | case BPF_FUNC_get_socket_cookie: |
3529 | return &bpf_get_socket_cookie_proto; | |
3530 | case BPF_FUNC_get_socket_uid: | |
3531 | return &bpf_get_socket_uid_proto; | |
174a79ff JF |
3532 | case BPF_FUNC_sk_redirect_map: |
3533 | return &bpf_sk_redirect_map_proto; | |
b005fd18 JF |
3534 | default: |
3535 | return bpf_base_func_proto(func_id); | |
3536 | } | |
3537 | } | |
3538 | ||
3a0af8fd TG |
3539 | static const struct bpf_func_proto * |
3540 | lwt_xmit_func_proto(enum bpf_func_id func_id) | |
3541 | { | |
3542 | switch (func_id) { | |
3543 | case BPF_FUNC_skb_get_tunnel_key: | |
3544 | return &bpf_skb_get_tunnel_key_proto; | |
3545 | case BPF_FUNC_skb_set_tunnel_key: | |
3546 | return bpf_get_skb_set_tunnel_proto(func_id); | |
3547 | case BPF_FUNC_skb_get_tunnel_opt: | |
3548 | return &bpf_skb_get_tunnel_opt_proto; | |
3549 | case BPF_FUNC_skb_set_tunnel_opt: | |
3550 | return bpf_get_skb_set_tunnel_proto(func_id); | |
3551 | case BPF_FUNC_redirect: | |
3552 | return &bpf_redirect_proto; | |
3553 | case BPF_FUNC_clone_redirect: | |
3554 | return &bpf_clone_redirect_proto; | |
3555 | case BPF_FUNC_skb_change_tail: | |
3556 | return &bpf_skb_change_tail_proto; | |
3557 | case BPF_FUNC_skb_change_head: | |
3558 | return &bpf_skb_change_head_proto; | |
3559 | case BPF_FUNC_skb_store_bytes: | |
3560 | return &bpf_skb_store_bytes_proto; | |
3561 | case BPF_FUNC_csum_update: | |
3562 | return &bpf_csum_update_proto; | |
3563 | case BPF_FUNC_l3_csum_replace: | |
3564 | return &bpf_l3_csum_replace_proto; | |
3565 | case BPF_FUNC_l4_csum_replace: | |
3566 | return &bpf_l4_csum_replace_proto; | |
3567 | case BPF_FUNC_set_hash_invalid: | |
3568 | return &bpf_set_hash_invalid_proto; | |
3569 | default: | |
3570 | return lwt_inout_func_proto(func_id); | |
3571 | } | |
3572 | } | |
3573 | ||
f96da094 DB |
3574 | static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, |
3575 | struct bpf_insn_access_aux *info) | |
23994631 | 3576 | { |
f96da094 | 3577 | const int size_default = sizeof(__u32); |
23994631 | 3578 | |
9bac3d6d AS |
3579 | if (off < 0 || off >= sizeof(struct __sk_buff)) |
3580 | return false; | |
62c7989b | 3581 | |
4936e352 | 3582 | /* The verifier guarantees that size > 0. */ |
9bac3d6d AS |
3583 | if (off % size != 0) |
3584 | return false; | |
62c7989b DB |
3585 | |
3586 | switch (off) { | |
f96da094 DB |
3587 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
3588 | if (off + size > offsetofend(struct __sk_buff, cb[4])) | |
62c7989b DB |
3589 | return false; |
3590 | break; | |
8a31db56 JF |
3591 | case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]): |
3592 | case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]): | |
3593 | case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4): | |
3594 | case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4): | |
f96da094 | 3595 | case bpf_ctx_range(struct __sk_buff, data): |
de8f3a83 | 3596 | case bpf_ctx_range(struct __sk_buff, data_meta): |
f96da094 DB |
3597 | case bpf_ctx_range(struct __sk_buff, data_end): |
3598 | if (size != size_default) | |
23994631 | 3599 | return false; |
31fd8581 YS |
3600 | break; |
3601 | default: | |
f96da094 | 3602 | /* Only narrow read access allowed for now. */ |
31fd8581 | 3603 | if (type == BPF_WRITE) { |
f96da094 | 3604 | if (size != size_default) |
31fd8581 YS |
3605 | return false; |
3606 | } else { | |
f96da094 DB |
3607 | bpf_ctx_record_field_size(info, size_default); |
3608 | if (!bpf_ctx_narrow_access_ok(off, size, size_default)) | |
23994631 | 3609 | return false; |
31fd8581 | 3610 | } |
62c7989b | 3611 | } |
9bac3d6d AS |
3612 | |
3613 | return true; | |
3614 | } | |
3615 | ||
d691f9e8 | 3616 | static bool sk_filter_is_valid_access(int off, int size, |
19de99f7 | 3617 | enum bpf_access_type type, |
23994631 | 3618 | struct bpf_insn_access_aux *info) |
d691f9e8 | 3619 | { |
db58ba45 | 3620 | switch (off) { |
f96da094 DB |
3621 | case bpf_ctx_range(struct __sk_buff, tc_classid): |
3622 | case bpf_ctx_range(struct __sk_buff, data): | |
de8f3a83 | 3623 | case bpf_ctx_range(struct __sk_buff, data_meta): |
f96da094 | 3624 | case bpf_ctx_range(struct __sk_buff, data_end): |
8a31db56 | 3625 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
045efa82 | 3626 | return false; |
db58ba45 | 3627 | } |
045efa82 | 3628 | |
d691f9e8 AS |
3629 | if (type == BPF_WRITE) { |
3630 | switch (off) { | |
f96da094 | 3631 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
d691f9e8 AS |
3632 | break; |
3633 | default: | |
3634 | return false; | |
3635 | } | |
3636 | } | |
3637 | ||
f96da094 | 3638 | return bpf_skb_is_valid_access(off, size, type, info); |
d691f9e8 AS |
3639 | } |
3640 | ||
3a0af8fd TG |
3641 | static bool lwt_is_valid_access(int off, int size, |
3642 | enum bpf_access_type type, | |
23994631 | 3643 | struct bpf_insn_access_aux *info) |
3a0af8fd TG |
3644 | { |
3645 | switch (off) { | |
f96da094 | 3646 | case bpf_ctx_range(struct __sk_buff, tc_classid): |
8a31db56 | 3647 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
de8f3a83 | 3648 | case bpf_ctx_range(struct __sk_buff, data_meta): |
3a0af8fd TG |
3649 | return false; |
3650 | } | |
3651 | ||
3652 | if (type == BPF_WRITE) { | |
3653 | switch (off) { | |
f96da094 DB |
3654 | case bpf_ctx_range(struct __sk_buff, mark): |
3655 | case bpf_ctx_range(struct __sk_buff, priority): | |
3656 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
3a0af8fd TG |
3657 | break; |
3658 | default: | |
3659 | return false; | |
3660 | } | |
3661 | } | |
3662 | ||
f96da094 DB |
3663 | switch (off) { |
3664 | case bpf_ctx_range(struct __sk_buff, data): | |
3665 | info->reg_type = PTR_TO_PACKET; | |
3666 | break; | |
3667 | case bpf_ctx_range(struct __sk_buff, data_end): | |
3668 | info->reg_type = PTR_TO_PACKET_END; | |
3669 | break; | |
3670 | } | |
3671 | ||
3672 | return bpf_skb_is_valid_access(off, size, type, info); | |
3a0af8fd TG |
3673 | } |
3674 | ||
61023658 DA |
3675 | static bool sock_filter_is_valid_access(int off, int size, |
3676 | enum bpf_access_type type, | |
23994631 | 3677 | struct bpf_insn_access_aux *info) |
61023658 DA |
3678 | { |
3679 | if (type == BPF_WRITE) { | |
3680 | switch (off) { | |
3681 | case offsetof(struct bpf_sock, bound_dev_if): | |
482dca93 | 3682 | case offsetof(struct bpf_sock, mark): |
482dca93 DA |
3683 | case offsetof(struct bpf_sock, priority): |
3684 | break; | |
61023658 DA |
3685 | default: |
3686 | return false; | |
3687 | } | |
3688 | } | |
3689 | ||
3690 | if (off < 0 || off + size > sizeof(struct bpf_sock)) | |
3691 | return false; | |
61023658 DA |
3692 | /* The verifier guarantees that size > 0. */ |
3693 | if (off % size != 0) | |
3694 | return false; | |
61023658 DA |
3695 | if (size != sizeof(__u32)) |
3696 | return false; | |
3697 | ||
3698 | return true; | |
3699 | } | |
3700 | ||
047b0ecd DB |
3701 | static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, |
3702 | const struct bpf_prog *prog, int drop_verdict) | |
36bbef52 DB |
3703 | { |
3704 | struct bpf_insn *insn = insn_buf; | |
3705 | ||
3706 | if (!direct_write) | |
3707 | return 0; | |
3708 | ||
3709 | /* if (!skb->cloned) | |
3710 | * goto start; | |
3711 | * | |
3712 | * (Fast-path, otherwise approximation that we might be | |
3713 | * a clone, do the rest in helper.) | |
3714 | */ | |
3715 | *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET()); | |
3716 | *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); | |
3717 | *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); | |
3718 | ||
3719 | /* ret = bpf_skb_pull_data(skb, 0); */ | |
3720 | *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); | |
3721 | *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); | |
3722 | *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, | |
3723 | BPF_FUNC_skb_pull_data); | |
3724 | /* if (!ret) | |
3725 | * goto restore; | |
3726 | * return TC_ACT_SHOT; | |
3727 | */ | |
3728 | *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); | |
047b0ecd | 3729 | *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict); |
36bbef52 DB |
3730 | *insn++ = BPF_EXIT_INSN(); |
3731 | ||
3732 | /* restore: */ | |
3733 | *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); | |
3734 | /* start: */ | |
3735 | *insn++ = prog->insnsi[0]; | |
3736 | ||
3737 | return insn - insn_buf; | |
3738 | } | |
3739 | ||
047b0ecd DB |
3740 | static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, |
3741 | const struct bpf_prog *prog) | |
3742 | { | |
3743 | return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT); | |
3744 | } | |
3745 | ||
d691f9e8 | 3746 | static bool tc_cls_act_is_valid_access(int off, int size, |
19de99f7 | 3747 | enum bpf_access_type type, |
23994631 | 3748 | struct bpf_insn_access_aux *info) |
d691f9e8 AS |
3749 | { |
3750 | if (type == BPF_WRITE) { | |
3751 | switch (off) { | |
f96da094 DB |
3752 | case bpf_ctx_range(struct __sk_buff, mark): |
3753 | case bpf_ctx_range(struct __sk_buff, tc_index): | |
3754 | case bpf_ctx_range(struct __sk_buff, priority): | |
3755 | case bpf_ctx_range(struct __sk_buff, tc_classid): | |
3756 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
d691f9e8 AS |
3757 | break; |
3758 | default: | |
3759 | return false; | |
3760 | } | |
3761 | } | |
19de99f7 | 3762 | |
f96da094 DB |
3763 | switch (off) { |
3764 | case bpf_ctx_range(struct __sk_buff, data): | |
3765 | info->reg_type = PTR_TO_PACKET; | |
3766 | break; | |
de8f3a83 DB |
3767 | case bpf_ctx_range(struct __sk_buff, data_meta): |
3768 | info->reg_type = PTR_TO_PACKET_META; | |
3769 | break; | |
f96da094 DB |
3770 | case bpf_ctx_range(struct __sk_buff, data_end): |
3771 | info->reg_type = PTR_TO_PACKET_END; | |
3772 | break; | |
8a31db56 JF |
3773 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
3774 | return false; | |
f96da094 DB |
3775 | } |
3776 | ||
3777 | return bpf_skb_is_valid_access(off, size, type, info); | |
d691f9e8 AS |
3778 | } |
3779 | ||
1afaf661 | 3780 | static bool __is_valid_xdp_access(int off, int size) |
6a773a15 BB |
3781 | { |
3782 | if (off < 0 || off >= sizeof(struct xdp_md)) | |
3783 | return false; | |
3784 | if (off % size != 0) | |
3785 | return false; | |
6088b582 | 3786 | if (size != sizeof(__u32)) |
6a773a15 BB |
3787 | return false; |
3788 | ||
3789 | return true; | |
3790 | } | |
3791 | ||
3792 | static bool xdp_is_valid_access(int off, int size, | |
3793 | enum bpf_access_type type, | |
23994631 | 3794 | struct bpf_insn_access_aux *info) |
6a773a15 BB |
3795 | { |
3796 | if (type == BPF_WRITE) | |
3797 | return false; | |
3798 | ||
3799 | switch (off) { | |
3800 | case offsetof(struct xdp_md, data): | |
23994631 | 3801 | info->reg_type = PTR_TO_PACKET; |
6a773a15 | 3802 | break; |
de8f3a83 DB |
3803 | case offsetof(struct xdp_md, data_meta): |
3804 | info->reg_type = PTR_TO_PACKET_META; | |
3805 | break; | |
6a773a15 | 3806 | case offsetof(struct xdp_md, data_end): |
23994631 | 3807 | info->reg_type = PTR_TO_PACKET_END; |
6a773a15 BB |
3808 | break; |
3809 | } | |
3810 | ||
1afaf661 | 3811 | return __is_valid_xdp_access(off, size); |
6a773a15 BB |
3812 | } |
3813 | ||
3814 | void bpf_warn_invalid_xdp_action(u32 act) | |
3815 | { | |
9beb8bed DB |
3816 | const u32 act_max = XDP_REDIRECT; |
3817 | ||
3818 | WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n", | |
3819 | act > act_max ? "Illegal" : "Driver unsupported", | |
3820 | act); | |
6a773a15 BB |
3821 | } |
3822 | EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); | |
3823 | ||
40304b2a LB |
3824 | static bool __is_valid_sock_ops_access(int off, int size) |
3825 | { | |
3826 | if (off < 0 || off >= sizeof(struct bpf_sock_ops)) | |
3827 | return false; | |
3828 | /* The verifier guarantees that size > 0. */ | |
3829 | if (off % size != 0) | |
3830 | return false; | |
3831 | if (size != sizeof(__u32)) | |
3832 | return false; | |
3833 | ||
3834 | return true; | |
3835 | } | |
3836 | ||
3837 | static bool sock_ops_is_valid_access(int off, int size, | |
3838 | enum bpf_access_type type, | |
3839 | struct bpf_insn_access_aux *info) | |
3840 | { | |
3841 | if (type == BPF_WRITE) { | |
3842 | switch (off) { | |
3843 | case offsetof(struct bpf_sock_ops, op) ... | |
3844 | offsetof(struct bpf_sock_ops, replylong[3]): | |
3845 | break; | |
3846 | default: | |
3847 | return false; | |
3848 | } | |
3849 | } | |
3850 | ||
3851 | return __is_valid_sock_ops_access(off, size); | |
3852 | } | |
3853 | ||
8a31db56 JF |
3854 | static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write, |
3855 | const struct bpf_prog *prog) | |
3856 | { | |
047b0ecd | 3857 | return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP); |
8a31db56 JF |
3858 | } |
3859 | ||
b005fd18 JF |
3860 | static bool sk_skb_is_valid_access(int off, int size, |
3861 | enum bpf_access_type type, | |
3862 | struct bpf_insn_access_aux *info) | |
3863 | { | |
de8f3a83 DB |
3864 | switch (off) { |
3865 | case bpf_ctx_range(struct __sk_buff, tc_classid): | |
3866 | case bpf_ctx_range(struct __sk_buff, data_meta): | |
3867 | return false; | |
3868 | } | |
3869 | ||
8a31db56 JF |
3870 | if (type == BPF_WRITE) { |
3871 | switch (off) { | |
8a31db56 JF |
3872 | case bpf_ctx_range(struct __sk_buff, tc_index): |
3873 | case bpf_ctx_range(struct __sk_buff, priority): | |
3874 | break; | |
3875 | default: | |
3876 | return false; | |
3877 | } | |
3878 | } | |
3879 | ||
b005fd18 | 3880 | switch (off) { |
f7e9cb1e | 3881 | case bpf_ctx_range(struct __sk_buff, mark): |
8a31db56 | 3882 | return false; |
b005fd18 JF |
3883 | case bpf_ctx_range(struct __sk_buff, data): |
3884 | info->reg_type = PTR_TO_PACKET; | |
3885 | break; | |
3886 | case bpf_ctx_range(struct __sk_buff, data_end): | |
3887 | info->reg_type = PTR_TO_PACKET_END; | |
3888 | break; | |
3889 | } | |
3890 | ||
3891 | return bpf_skb_is_valid_access(off, size, type, info); | |
3892 | } | |
3893 | ||
2492d3b8 DB |
3894 | static u32 bpf_convert_ctx_access(enum bpf_access_type type, |
3895 | const struct bpf_insn *si, | |
3896 | struct bpf_insn *insn_buf, | |
f96da094 | 3897 | struct bpf_prog *prog, u32 *target_size) |
9bac3d6d AS |
3898 | { |
3899 | struct bpf_insn *insn = insn_buf; | |
6b8cc1d1 | 3900 | int off; |
9bac3d6d | 3901 | |
6b8cc1d1 | 3902 | switch (si->off) { |
9bac3d6d | 3903 | case offsetof(struct __sk_buff, len): |
6b8cc1d1 | 3904 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3905 | bpf_target_off(struct sk_buff, len, 4, |
3906 | target_size)); | |
9bac3d6d AS |
3907 | break; |
3908 | ||
0b8c707d | 3909 | case offsetof(struct __sk_buff, protocol): |
6b8cc1d1 | 3910 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
3911 | bpf_target_off(struct sk_buff, protocol, 2, |
3912 | target_size)); | |
0b8c707d DB |
3913 | break; |
3914 | ||
27cd5452 | 3915 | case offsetof(struct __sk_buff, vlan_proto): |
6b8cc1d1 | 3916 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
3917 | bpf_target_off(struct sk_buff, vlan_proto, 2, |
3918 | target_size)); | |
27cd5452 MS |
3919 | break; |
3920 | ||
bcad5718 | 3921 | case offsetof(struct __sk_buff, priority): |
754f1e6a | 3922 | if (type == BPF_WRITE) |
6b8cc1d1 | 3923 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3924 | bpf_target_off(struct sk_buff, priority, 4, |
3925 | target_size)); | |
754f1e6a | 3926 | else |
6b8cc1d1 | 3927 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3928 | bpf_target_off(struct sk_buff, priority, 4, |
3929 | target_size)); | |
bcad5718 DB |
3930 | break; |
3931 | ||
37e82c2f | 3932 | case offsetof(struct __sk_buff, ingress_ifindex): |
6b8cc1d1 | 3933 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3934 | bpf_target_off(struct sk_buff, skb_iif, 4, |
3935 | target_size)); | |
37e82c2f AS |
3936 | break; |
3937 | ||
3938 | case offsetof(struct __sk_buff, ifindex): | |
f035a515 | 3939 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
6b8cc1d1 | 3940 | si->dst_reg, si->src_reg, |
37e82c2f | 3941 | offsetof(struct sk_buff, dev)); |
6b8cc1d1 DB |
3942 | *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); |
3943 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
f96da094 DB |
3944 | bpf_target_off(struct net_device, ifindex, 4, |
3945 | target_size)); | |
37e82c2f AS |
3946 | break; |
3947 | ||
ba7591d8 | 3948 | case offsetof(struct __sk_buff, hash): |
6b8cc1d1 | 3949 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3950 | bpf_target_off(struct sk_buff, hash, 4, |
3951 | target_size)); | |
ba7591d8 DB |
3952 | break; |
3953 | ||
9bac3d6d | 3954 | case offsetof(struct __sk_buff, mark): |
d691f9e8 | 3955 | if (type == BPF_WRITE) |
6b8cc1d1 | 3956 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3957 | bpf_target_off(struct sk_buff, mark, 4, |
3958 | target_size)); | |
d691f9e8 | 3959 | else |
6b8cc1d1 | 3960 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3961 | bpf_target_off(struct sk_buff, mark, 4, |
3962 | target_size)); | |
d691f9e8 | 3963 | break; |
9bac3d6d AS |
3964 | |
3965 | case offsetof(struct __sk_buff, pkt_type): | |
f96da094 DB |
3966 | *target_size = 1; |
3967 | *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, | |
3968 | PKT_TYPE_OFFSET()); | |
3969 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); | |
3970 | #ifdef __BIG_ENDIAN_BITFIELD | |
3971 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); | |
3972 | #endif | |
3973 | break; | |
9bac3d6d AS |
3974 | |
3975 | case offsetof(struct __sk_buff, queue_mapping): | |
f96da094 DB |
3976 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
3977 | bpf_target_off(struct sk_buff, queue_mapping, 2, | |
3978 | target_size)); | |
3979 | break; | |
c2497395 | 3980 | |
c2497395 | 3981 | case offsetof(struct __sk_buff, vlan_present): |
c2497395 | 3982 | case offsetof(struct __sk_buff, vlan_tci): |
f96da094 DB |
3983 | BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000); |
3984 | ||
3985 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, | |
3986 | bpf_target_off(struct sk_buff, vlan_tci, 2, | |
3987 | target_size)); | |
3988 | if (si->off == offsetof(struct __sk_buff, vlan_tci)) { | |
3989 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, | |
3990 | ~VLAN_TAG_PRESENT); | |
3991 | } else { | |
3992 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 12); | |
3993 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1); | |
3994 | } | |
3995 | break; | |
d691f9e8 AS |
3996 | |
3997 | case offsetof(struct __sk_buff, cb[0]) ... | |
f96da094 | 3998 | offsetofend(struct __sk_buff, cb[4]) - 1: |
d691f9e8 | 3999 | BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, data) < 20); |
62c7989b DB |
4000 | BUILD_BUG_ON((offsetof(struct sk_buff, cb) + |
4001 | offsetof(struct qdisc_skb_cb, data)) % | |
4002 | sizeof(__u64)); | |
d691f9e8 | 4003 | |
ff936a04 | 4004 | prog->cb_access = 1; |
6b8cc1d1 DB |
4005 | off = si->off; |
4006 | off -= offsetof(struct __sk_buff, cb[0]); | |
4007 | off += offsetof(struct sk_buff, cb); | |
4008 | off += offsetof(struct qdisc_skb_cb, data); | |
d691f9e8 | 4009 | if (type == BPF_WRITE) |
62c7989b | 4010 | *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg, |
6b8cc1d1 | 4011 | si->src_reg, off); |
d691f9e8 | 4012 | else |
62c7989b | 4013 | *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, |
6b8cc1d1 | 4014 | si->src_reg, off); |
d691f9e8 AS |
4015 | break; |
4016 | ||
045efa82 | 4017 | case offsetof(struct __sk_buff, tc_classid): |
6b8cc1d1 DB |
4018 | BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, tc_classid) != 2); |
4019 | ||
4020 | off = si->off; | |
4021 | off -= offsetof(struct __sk_buff, tc_classid); | |
4022 | off += offsetof(struct sk_buff, cb); | |
4023 | off += offsetof(struct qdisc_skb_cb, tc_classid); | |
f96da094 | 4024 | *target_size = 2; |
09c37a2c | 4025 | if (type == BPF_WRITE) |
6b8cc1d1 DB |
4026 | *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, |
4027 | si->src_reg, off); | |
09c37a2c | 4028 | else |
6b8cc1d1 DB |
4029 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, |
4030 | si->src_reg, off); | |
045efa82 DB |
4031 | break; |
4032 | ||
db58ba45 | 4033 | case offsetof(struct __sk_buff, data): |
f035a515 | 4034 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), |
6b8cc1d1 | 4035 | si->dst_reg, si->src_reg, |
db58ba45 AS |
4036 | offsetof(struct sk_buff, data)); |
4037 | break; | |
4038 | ||
de8f3a83 DB |
4039 | case offsetof(struct __sk_buff, data_meta): |
4040 | off = si->off; | |
4041 | off -= offsetof(struct __sk_buff, data_meta); | |
4042 | off += offsetof(struct sk_buff, cb); | |
4043 | off += offsetof(struct bpf_skb_data_end, data_meta); | |
4044 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
4045 | si->src_reg, off); | |
4046 | break; | |
4047 | ||
db58ba45 | 4048 | case offsetof(struct __sk_buff, data_end): |
6b8cc1d1 DB |
4049 | off = si->off; |
4050 | off -= offsetof(struct __sk_buff, data_end); | |
4051 | off += offsetof(struct sk_buff, cb); | |
4052 | off += offsetof(struct bpf_skb_data_end, data_end); | |
4053 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
4054 | si->src_reg, off); | |
db58ba45 AS |
4055 | break; |
4056 | ||
d691f9e8 AS |
4057 | case offsetof(struct __sk_buff, tc_index): |
4058 | #ifdef CONFIG_NET_SCHED | |
d691f9e8 | 4059 | if (type == BPF_WRITE) |
6b8cc1d1 | 4060 | *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
4061 | bpf_target_off(struct sk_buff, tc_index, 2, |
4062 | target_size)); | |
d691f9e8 | 4063 | else |
6b8cc1d1 | 4064 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
4065 | bpf_target_off(struct sk_buff, tc_index, 2, |
4066 | target_size)); | |
d691f9e8 | 4067 | #else |
2ed46ce4 | 4068 | *target_size = 2; |
d691f9e8 | 4069 | if (type == BPF_WRITE) |
6b8cc1d1 | 4070 | *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); |
d691f9e8 | 4071 | else |
6b8cc1d1 | 4072 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
b1d9fc41 DB |
4073 | #endif |
4074 | break; | |
4075 | ||
4076 | case offsetof(struct __sk_buff, napi_id): | |
4077 | #if defined(CONFIG_NET_RX_BUSY_POLL) | |
b1d9fc41 | 4078 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
4079 | bpf_target_off(struct sk_buff, napi_id, 4, |
4080 | target_size)); | |
b1d9fc41 DB |
4081 | *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); |
4082 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); | |
4083 | #else | |
2ed46ce4 | 4084 | *target_size = 4; |
b1d9fc41 | 4085 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
d691f9e8 | 4086 | #endif |
6b8cc1d1 | 4087 | break; |
8a31db56 JF |
4088 | case offsetof(struct __sk_buff, family): |
4089 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); | |
4090 | ||
4091 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
4092 | si->dst_reg, si->src_reg, | |
4093 | offsetof(struct sk_buff, sk)); | |
4094 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
4095 | bpf_target_off(struct sock_common, | |
4096 | skc_family, | |
4097 | 2, target_size)); | |
4098 | break; | |
4099 | case offsetof(struct __sk_buff, remote_ip4): | |
4100 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); | |
4101 | ||
4102 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
4103 | si->dst_reg, si->src_reg, | |
4104 | offsetof(struct sk_buff, sk)); | |
4105 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
4106 | bpf_target_off(struct sock_common, | |
4107 | skc_daddr, | |
4108 | 4, target_size)); | |
4109 | break; | |
4110 | case offsetof(struct __sk_buff, local_ip4): | |
4111 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
4112 | skc_rcv_saddr) != 4); | |
4113 | ||
4114 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
4115 | si->dst_reg, si->src_reg, | |
4116 | offsetof(struct sk_buff, sk)); | |
4117 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
4118 | bpf_target_off(struct sock_common, | |
4119 | skc_rcv_saddr, | |
4120 | 4, target_size)); | |
4121 | break; | |
4122 | case offsetof(struct __sk_buff, remote_ip6[0]) ... | |
4123 | offsetof(struct __sk_buff, remote_ip6[3]): | |
4124 | #if IS_ENABLED(CONFIG_IPV6) | |
4125 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
4126 | skc_v6_daddr.s6_addr32[0]) != 4); | |
4127 | ||
4128 | off = si->off; | |
4129 | off -= offsetof(struct __sk_buff, remote_ip6[0]); | |
4130 | ||
4131 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
4132 | si->dst_reg, si->src_reg, | |
4133 | offsetof(struct sk_buff, sk)); | |
4134 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
4135 | offsetof(struct sock_common, | |
4136 | skc_v6_daddr.s6_addr32[0]) + | |
4137 | off); | |
4138 | #else | |
4139 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
4140 | #endif | |
4141 | break; | |
4142 | case offsetof(struct __sk_buff, local_ip6[0]) ... | |
4143 | offsetof(struct __sk_buff, local_ip6[3]): | |
4144 | #if IS_ENABLED(CONFIG_IPV6) | |
4145 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
4146 | skc_v6_rcv_saddr.s6_addr32[0]) != 4); | |
4147 | ||
4148 | off = si->off; | |
4149 | off -= offsetof(struct __sk_buff, local_ip6[0]); | |
4150 | ||
4151 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
4152 | si->dst_reg, si->src_reg, | |
4153 | offsetof(struct sk_buff, sk)); | |
4154 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
4155 | offsetof(struct sock_common, | |
4156 | skc_v6_rcv_saddr.s6_addr32[0]) + | |
4157 | off); | |
4158 | #else | |
4159 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
4160 | #endif | |
4161 | break; | |
4162 | ||
4163 | case offsetof(struct __sk_buff, remote_port): | |
4164 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); | |
4165 | ||
4166 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
4167 | si->dst_reg, si->src_reg, | |
4168 | offsetof(struct sk_buff, sk)); | |
4169 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
4170 | bpf_target_off(struct sock_common, | |
4171 | skc_dport, | |
4172 | 2, target_size)); | |
4173 | #ifndef __BIG_ENDIAN_BITFIELD | |
4174 | *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); | |
4175 | #endif | |
4176 | break; | |
4177 | ||
4178 | case offsetof(struct __sk_buff, local_port): | |
4179 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); | |
4180 | ||
4181 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
4182 | si->dst_reg, si->src_reg, | |
4183 | offsetof(struct sk_buff, sk)); | |
4184 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
4185 | bpf_target_off(struct sock_common, | |
4186 | skc_num, 2, target_size)); | |
4187 | break; | |
9bac3d6d AS |
4188 | } |
4189 | ||
4190 | return insn - insn_buf; | |
89aa0758 AS |
4191 | } |
4192 | ||
61023658 | 4193 | static u32 sock_filter_convert_ctx_access(enum bpf_access_type type, |
6b8cc1d1 | 4194 | const struct bpf_insn *si, |
61023658 | 4195 | struct bpf_insn *insn_buf, |
f96da094 | 4196 | struct bpf_prog *prog, u32 *target_size) |
61023658 DA |
4197 | { |
4198 | struct bpf_insn *insn = insn_buf; | |
4199 | ||
6b8cc1d1 | 4200 | switch (si->off) { |
61023658 DA |
4201 | case offsetof(struct bpf_sock, bound_dev_if): |
4202 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_bound_dev_if) != 4); | |
4203 | ||
4204 | if (type == BPF_WRITE) | |
6b8cc1d1 | 4205 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
61023658 DA |
4206 | offsetof(struct sock, sk_bound_dev_if)); |
4207 | else | |
6b8cc1d1 | 4208 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
61023658 DA |
4209 | offsetof(struct sock, sk_bound_dev_if)); |
4210 | break; | |
aa4c1037 | 4211 | |
482dca93 DA |
4212 | case offsetof(struct bpf_sock, mark): |
4213 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_mark) != 4); | |
4214 | ||
4215 | if (type == BPF_WRITE) | |
4216 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
4217 | offsetof(struct sock, sk_mark)); | |
4218 | else | |
4219 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
4220 | offsetof(struct sock, sk_mark)); | |
4221 | break; | |
4222 | ||
4223 | case offsetof(struct bpf_sock, priority): | |
4224 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_priority) != 4); | |
4225 | ||
4226 | if (type == BPF_WRITE) | |
4227 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
4228 | offsetof(struct sock, sk_priority)); | |
4229 | else | |
4230 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
4231 | offsetof(struct sock, sk_priority)); | |
4232 | break; | |
4233 | ||
aa4c1037 DA |
4234 | case offsetof(struct bpf_sock, family): |
4235 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_family) != 2); | |
4236 | ||
6b8cc1d1 | 4237 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
aa4c1037 DA |
4238 | offsetof(struct sock, sk_family)); |
4239 | break; | |
4240 | ||
4241 | case offsetof(struct bpf_sock, type): | |
6b8cc1d1 | 4242 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
aa4c1037 | 4243 | offsetof(struct sock, __sk_flags_offset)); |
6b8cc1d1 DB |
4244 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK); |
4245 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT); | |
aa4c1037 DA |
4246 | break; |
4247 | ||
4248 | case offsetof(struct bpf_sock, protocol): | |
6b8cc1d1 | 4249 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
aa4c1037 | 4250 | offsetof(struct sock, __sk_flags_offset)); |
6b8cc1d1 DB |
4251 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK); |
4252 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_PROTO_SHIFT); | |
aa4c1037 | 4253 | break; |
61023658 DA |
4254 | } |
4255 | ||
4256 | return insn - insn_buf; | |
4257 | } | |
4258 | ||
6b8cc1d1 DB |
4259 | static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, |
4260 | const struct bpf_insn *si, | |
374fb54e | 4261 | struct bpf_insn *insn_buf, |
f96da094 | 4262 | struct bpf_prog *prog, u32 *target_size) |
374fb54e DB |
4263 | { |
4264 | struct bpf_insn *insn = insn_buf; | |
4265 | ||
6b8cc1d1 | 4266 | switch (si->off) { |
374fb54e | 4267 | case offsetof(struct __sk_buff, ifindex): |
374fb54e | 4268 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
6b8cc1d1 | 4269 | si->dst_reg, si->src_reg, |
374fb54e | 4270 | offsetof(struct sk_buff, dev)); |
6b8cc1d1 | 4271 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
f96da094 DB |
4272 | bpf_target_off(struct net_device, ifindex, 4, |
4273 | target_size)); | |
374fb54e DB |
4274 | break; |
4275 | default: | |
f96da094 DB |
4276 | return bpf_convert_ctx_access(type, si, insn_buf, prog, |
4277 | target_size); | |
374fb54e DB |
4278 | } |
4279 | ||
4280 | return insn - insn_buf; | |
4281 | } | |
4282 | ||
6b8cc1d1 DB |
4283 | static u32 xdp_convert_ctx_access(enum bpf_access_type type, |
4284 | const struct bpf_insn *si, | |
6a773a15 | 4285 | struct bpf_insn *insn_buf, |
f96da094 | 4286 | struct bpf_prog *prog, u32 *target_size) |
6a773a15 BB |
4287 | { |
4288 | struct bpf_insn *insn = insn_buf; | |
4289 | ||
6b8cc1d1 | 4290 | switch (si->off) { |
6a773a15 | 4291 | case offsetof(struct xdp_md, data): |
f035a515 | 4292 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), |
6b8cc1d1 | 4293 | si->dst_reg, si->src_reg, |
6a773a15 BB |
4294 | offsetof(struct xdp_buff, data)); |
4295 | break; | |
de8f3a83 DB |
4296 | case offsetof(struct xdp_md, data_meta): |
4297 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta), | |
4298 | si->dst_reg, si->src_reg, | |
4299 | offsetof(struct xdp_buff, data_meta)); | |
4300 | break; | |
6a773a15 | 4301 | case offsetof(struct xdp_md, data_end): |
f035a515 | 4302 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), |
6b8cc1d1 | 4303 | si->dst_reg, si->src_reg, |
6a773a15 BB |
4304 | offsetof(struct xdp_buff, data_end)); |
4305 | break; | |
4306 | } | |
4307 | ||
4308 | return insn - insn_buf; | |
4309 | } | |
4310 | ||
40304b2a LB |
4311 | static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, |
4312 | const struct bpf_insn *si, | |
4313 | struct bpf_insn *insn_buf, | |
f96da094 DB |
4314 | struct bpf_prog *prog, |
4315 | u32 *target_size) | |
40304b2a LB |
4316 | { |
4317 | struct bpf_insn *insn = insn_buf; | |
4318 | int off; | |
4319 | ||
4320 | switch (si->off) { | |
4321 | case offsetof(struct bpf_sock_ops, op) ... | |
4322 | offsetof(struct bpf_sock_ops, replylong[3]): | |
4323 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, op) != | |
4324 | FIELD_SIZEOF(struct bpf_sock_ops_kern, op)); | |
4325 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, reply) != | |
4326 | FIELD_SIZEOF(struct bpf_sock_ops_kern, reply)); | |
4327 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, replylong) != | |
4328 | FIELD_SIZEOF(struct bpf_sock_ops_kern, replylong)); | |
4329 | off = si->off; | |
4330 | off -= offsetof(struct bpf_sock_ops, op); | |
4331 | off += offsetof(struct bpf_sock_ops_kern, op); | |
4332 | if (type == BPF_WRITE) | |
4333 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
4334 | off); | |
4335 | else | |
4336 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
4337 | off); | |
4338 | break; | |
4339 | ||
4340 | case offsetof(struct bpf_sock_ops, family): | |
4341 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); | |
4342 | ||
4343 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
4344 | struct bpf_sock_ops_kern, sk), | |
4345 | si->dst_reg, si->src_reg, | |
4346 | offsetof(struct bpf_sock_ops_kern, sk)); | |
4347 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
4348 | offsetof(struct sock_common, skc_family)); | |
4349 | break; | |
4350 | ||
4351 | case offsetof(struct bpf_sock_ops, remote_ip4): | |
4352 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); | |
4353 | ||
4354 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
4355 | struct bpf_sock_ops_kern, sk), | |
4356 | si->dst_reg, si->src_reg, | |
4357 | offsetof(struct bpf_sock_ops_kern, sk)); | |
4358 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
4359 | offsetof(struct sock_common, skc_daddr)); | |
4360 | break; | |
4361 | ||
4362 | case offsetof(struct bpf_sock_ops, local_ip4): | |
4363 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_rcv_saddr) != 4); | |
4364 | ||
4365 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
4366 | struct bpf_sock_ops_kern, sk), | |
4367 | si->dst_reg, si->src_reg, | |
4368 | offsetof(struct bpf_sock_ops_kern, sk)); | |
4369 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
4370 | offsetof(struct sock_common, | |
4371 | skc_rcv_saddr)); | |
4372 | break; | |
4373 | ||
4374 | case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... | |
4375 | offsetof(struct bpf_sock_ops, remote_ip6[3]): | |
4376 | #if IS_ENABLED(CONFIG_IPV6) | |
4377 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
4378 | skc_v6_daddr.s6_addr32[0]) != 4); | |
4379 | ||
4380 | off = si->off; | |
4381 | off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); | |
4382 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
4383 | struct bpf_sock_ops_kern, sk), | |
4384 | si->dst_reg, si->src_reg, | |
4385 | offsetof(struct bpf_sock_ops_kern, sk)); | |
4386 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
4387 | offsetof(struct sock_common, | |
4388 | skc_v6_daddr.s6_addr32[0]) + | |
4389 | off); | |
4390 | #else | |
4391 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
4392 | #endif | |
4393 | break; | |
4394 | ||
4395 | case offsetof(struct bpf_sock_ops, local_ip6[0]) ... | |
4396 | offsetof(struct bpf_sock_ops, local_ip6[3]): | |
4397 | #if IS_ENABLED(CONFIG_IPV6) | |
4398 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
4399 | skc_v6_rcv_saddr.s6_addr32[0]) != 4); | |
4400 | ||
4401 | off = si->off; | |
4402 | off -= offsetof(struct bpf_sock_ops, local_ip6[0]); | |
4403 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
4404 | struct bpf_sock_ops_kern, sk), | |
4405 | si->dst_reg, si->src_reg, | |
4406 | offsetof(struct bpf_sock_ops_kern, sk)); | |
4407 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
4408 | offsetof(struct sock_common, | |
4409 | skc_v6_rcv_saddr.s6_addr32[0]) + | |
4410 | off); | |
4411 | #else | |
4412 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
4413 | #endif | |
4414 | break; | |
4415 | ||
4416 | case offsetof(struct bpf_sock_ops, remote_port): | |
4417 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); | |
4418 | ||
4419 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
4420 | struct bpf_sock_ops_kern, sk), | |
4421 | si->dst_reg, si->src_reg, | |
4422 | offsetof(struct bpf_sock_ops_kern, sk)); | |
4423 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
4424 | offsetof(struct sock_common, skc_dport)); | |
4425 | #ifndef __BIG_ENDIAN_BITFIELD | |
4426 | *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); | |
4427 | #endif | |
4428 | break; | |
4429 | ||
4430 | case offsetof(struct bpf_sock_ops, local_port): | |
4431 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); | |
4432 | ||
4433 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
4434 | struct bpf_sock_ops_kern, sk), | |
4435 | si->dst_reg, si->src_reg, | |
4436 | offsetof(struct bpf_sock_ops_kern, sk)); | |
4437 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
4438 | offsetof(struct sock_common, skc_num)); | |
4439 | break; | |
4440 | } | |
4441 | return insn - insn_buf; | |
4442 | } | |
4443 | ||
8108a775 JF |
4444 | static u32 sk_skb_convert_ctx_access(enum bpf_access_type type, |
4445 | const struct bpf_insn *si, | |
4446 | struct bpf_insn *insn_buf, | |
4447 | struct bpf_prog *prog, u32 *target_size) | |
4448 | { | |
4449 | struct bpf_insn *insn = insn_buf; | |
4450 | int off; | |
4451 | ||
4452 | switch (si->off) { | |
4453 | case offsetof(struct __sk_buff, data_end): | |
4454 | off = si->off; | |
4455 | off -= offsetof(struct __sk_buff, data_end); | |
4456 | off += offsetof(struct sk_buff, cb); | |
4457 | off += offsetof(struct tcp_skb_cb, bpf.data_end); | |
4458 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
4459 | si->src_reg, off); | |
4460 | break; | |
4461 | default: | |
4462 | return bpf_convert_ctx_access(type, si, insn_buf, prog, | |
4463 | target_size); | |
4464 | } | |
4465 | ||
4466 | return insn - insn_buf; | |
4467 | } | |
4468 | ||
7de16e3a | 4469 | const struct bpf_verifier_ops sk_filter_verifier_ops = { |
4936e352 DB |
4470 | .get_func_proto = sk_filter_func_proto, |
4471 | .is_valid_access = sk_filter_is_valid_access, | |
2492d3b8 | 4472 | .convert_ctx_access = bpf_convert_ctx_access, |
89aa0758 AS |
4473 | }; |
4474 | ||
7de16e3a JK |
4475 | const struct bpf_prog_ops sk_filter_prog_ops = { |
4476 | }; | |
4477 | ||
4478 | const struct bpf_verifier_ops tc_cls_act_verifier_ops = { | |
4936e352 DB |
4479 | .get_func_proto = tc_cls_act_func_proto, |
4480 | .is_valid_access = tc_cls_act_is_valid_access, | |
374fb54e | 4481 | .convert_ctx_access = tc_cls_act_convert_ctx_access, |
36bbef52 | 4482 | .gen_prologue = tc_cls_act_prologue, |
7de16e3a JK |
4483 | }; |
4484 | ||
4485 | const struct bpf_prog_ops tc_cls_act_prog_ops = { | |
1cf1cae9 | 4486 | .test_run = bpf_prog_test_run_skb, |
608cd71a AS |
4487 | }; |
4488 | ||
7de16e3a | 4489 | const struct bpf_verifier_ops xdp_verifier_ops = { |
6a773a15 BB |
4490 | .get_func_proto = xdp_func_proto, |
4491 | .is_valid_access = xdp_is_valid_access, | |
4492 | .convert_ctx_access = xdp_convert_ctx_access, | |
7de16e3a JK |
4493 | }; |
4494 | ||
4495 | const struct bpf_prog_ops xdp_prog_ops = { | |
1cf1cae9 | 4496 | .test_run = bpf_prog_test_run_xdp, |
6a773a15 BB |
4497 | }; |
4498 | ||
7de16e3a | 4499 | const struct bpf_verifier_ops cg_skb_verifier_ops = { |
966789fb | 4500 | .get_func_proto = sk_filter_func_proto, |
0e33661d | 4501 | .is_valid_access = sk_filter_is_valid_access, |
2492d3b8 | 4502 | .convert_ctx_access = bpf_convert_ctx_access, |
7de16e3a JK |
4503 | }; |
4504 | ||
4505 | const struct bpf_prog_ops cg_skb_prog_ops = { | |
1cf1cae9 | 4506 | .test_run = bpf_prog_test_run_skb, |
0e33661d DM |
4507 | }; |
4508 | ||
7de16e3a | 4509 | const struct bpf_verifier_ops lwt_inout_verifier_ops = { |
3a0af8fd TG |
4510 | .get_func_proto = lwt_inout_func_proto, |
4511 | .is_valid_access = lwt_is_valid_access, | |
2492d3b8 | 4512 | .convert_ctx_access = bpf_convert_ctx_access, |
7de16e3a JK |
4513 | }; |
4514 | ||
4515 | const struct bpf_prog_ops lwt_inout_prog_ops = { | |
1cf1cae9 | 4516 | .test_run = bpf_prog_test_run_skb, |
3a0af8fd TG |
4517 | }; |
4518 | ||
7de16e3a | 4519 | const struct bpf_verifier_ops lwt_xmit_verifier_ops = { |
3a0af8fd TG |
4520 | .get_func_proto = lwt_xmit_func_proto, |
4521 | .is_valid_access = lwt_is_valid_access, | |
2492d3b8 | 4522 | .convert_ctx_access = bpf_convert_ctx_access, |
3a0af8fd | 4523 | .gen_prologue = tc_cls_act_prologue, |
7de16e3a JK |
4524 | }; |
4525 | ||
4526 | const struct bpf_prog_ops lwt_xmit_prog_ops = { | |
1cf1cae9 | 4527 | .test_run = bpf_prog_test_run_skb, |
3a0af8fd TG |
4528 | }; |
4529 | ||
7de16e3a | 4530 | const struct bpf_verifier_ops cg_sock_verifier_ops = { |
ae2cf1c4 | 4531 | .get_func_proto = sock_filter_func_proto, |
61023658 DA |
4532 | .is_valid_access = sock_filter_is_valid_access, |
4533 | .convert_ctx_access = sock_filter_convert_ctx_access, | |
4534 | }; | |
4535 | ||
7de16e3a JK |
4536 | const struct bpf_prog_ops cg_sock_prog_ops = { |
4537 | }; | |
4538 | ||
4539 | const struct bpf_verifier_ops sock_ops_verifier_ops = { | |
8c4b4c7e | 4540 | .get_func_proto = sock_ops_func_proto, |
40304b2a LB |
4541 | .is_valid_access = sock_ops_is_valid_access, |
4542 | .convert_ctx_access = sock_ops_convert_ctx_access, | |
4543 | }; | |
4544 | ||
7de16e3a JK |
4545 | const struct bpf_prog_ops sock_ops_prog_ops = { |
4546 | }; | |
4547 | ||
4548 | const struct bpf_verifier_ops sk_skb_verifier_ops = { | |
b005fd18 JF |
4549 | .get_func_proto = sk_skb_func_proto, |
4550 | .is_valid_access = sk_skb_is_valid_access, | |
8108a775 | 4551 | .convert_ctx_access = sk_skb_convert_ctx_access, |
8a31db56 | 4552 | .gen_prologue = sk_skb_prologue, |
b005fd18 JF |
4553 | }; |
4554 | ||
7de16e3a JK |
4555 | const struct bpf_prog_ops sk_skb_prog_ops = { |
4556 | }; | |
4557 | ||
8ced425e | 4558 | int sk_detach_filter(struct sock *sk) |
55b33325 PE |
4559 | { |
4560 | int ret = -ENOENT; | |
4561 | struct sk_filter *filter; | |
4562 | ||
d59577b6 VB |
4563 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
4564 | return -EPERM; | |
4565 | ||
8ced425e HFS |
4566 | filter = rcu_dereference_protected(sk->sk_filter, |
4567 | lockdep_sock_is_held(sk)); | |
55b33325 | 4568 | if (filter) { |
a9b3cd7f | 4569 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
46bcf14f | 4570 | sk_filter_uncharge(sk, filter); |
55b33325 PE |
4571 | ret = 0; |
4572 | } | |
a3ea269b | 4573 | |
55b33325 PE |
4574 | return ret; |
4575 | } | |
8ced425e | 4576 | EXPORT_SYMBOL_GPL(sk_detach_filter); |
a8fc9277 | 4577 | |
a3ea269b DB |
4578 | int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf, |
4579 | unsigned int len) | |
a8fc9277 | 4580 | { |
a3ea269b | 4581 | struct sock_fprog_kern *fprog; |
a8fc9277 | 4582 | struct sk_filter *filter; |
a3ea269b | 4583 | int ret = 0; |
a8fc9277 PE |
4584 | |
4585 | lock_sock(sk); | |
4586 | filter = rcu_dereference_protected(sk->sk_filter, | |
8ced425e | 4587 | lockdep_sock_is_held(sk)); |
a8fc9277 PE |
4588 | if (!filter) |
4589 | goto out; | |
a3ea269b DB |
4590 | |
4591 | /* We're copying the filter that has been originally attached, | |
93d08b69 DB |
4592 | * so no conversion/decode needed anymore. eBPF programs that |
4593 | * have no original program cannot be dumped through this. | |
a3ea269b | 4594 | */ |
93d08b69 | 4595 | ret = -EACCES; |
7ae457c1 | 4596 | fprog = filter->prog->orig_prog; |
93d08b69 DB |
4597 | if (!fprog) |
4598 | goto out; | |
a3ea269b DB |
4599 | |
4600 | ret = fprog->len; | |
a8fc9277 | 4601 | if (!len) |
a3ea269b | 4602 | /* User space only enquires number of filter blocks. */ |
a8fc9277 | 4603 | goto out; |
a3ea269b | 4604 | |
a8fc9277 | 4605 | ret = -EINVAL; |
a3ea269b | 4606 | if (len < fprog->len) |
a8fc9277 PE |
4607 | goto out; |
4608 | ||
4609 | ret = -EFAULT; | |
009937e7 | 4610 | if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog))) |
a3ea269b | 4611 | goto out; |
a8fc9277 | 4612 | |
a3ea269b DB |
4613 | /* Instead of bytes, the API requests to return the number |
4614 | * of filter blocks. | |
4615 | */ | |
4616 | ret = fprog->len; | |
a8fc9277 PE |
4617 | out: |
4618 | release_sock(sk); | |
4619 | return ret; | |
4620 | } |