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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> |
1da177e4 | 46 | #include <linux/filter.h> |
86e4ca66 | 47 | #include <linux/ratelimit.h> |
46b325c7 | 48 | #include <linux/seccomp.h> |
f3335031 | 49 | #include <linux/if_vlan.h> |
89aa0758 | 50 | #include <linux/bpf.h> |
d691f9e8 | 51 | #include <net/sch_generic.h> |
8d20aabe | 52 | #include <net/cls_cgroup.h> |
d3aa45ce | 53 | #include <net/dst_metadata.h> |
c46646d0 | 54 | #include <net/dst.h> |
538950a1 | 55 | #include <net/sock_reuseport.h> |
b1d9fc41 | 56 | #include <net/busy_poll.h> |
8c4b4c7e | 57 | #include <net/tcp.h> |
1da177e4 | 58 | |
43db6d65 | 59 | /** |
f4979fce | 60 | * sk_filter_trim_cap - run a packet through a socket filter |
43db6d65 SH |
61 | * @sk: sock associated with &sk_buff |
62 | * @skb: buffer to filter | |
f4979fce | 63 | * @cap: limit on how short the eBPF program may trim the packet |
43db6d65 | 64 | * |
ff936a04 AS |
65 | * Run the eBPF program and then cut skb->data to correct size returned by |
66 | * the program. If pkt_len is 0 we toss packet. If skb->len is smaller | |
43db6d65 | 67 | * than pkt_len we keep whole skb->data. This is the socket level |
ff936a04 | 68 | * wrapper to BPF_PROG_RUN. It returns 0 if the packet should |
43db6d65 SH |
69 | * be accepted or -EPERM if the packet should be tossed. |
70 | * | |
71 | */ | |
f4979fce | 72 | int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) |
43db6d65 SH |
73 | { |
74 | int err; | |
75 | struct sk_filter *filter; | |
76 | ||
c93bdd0e MG |
77 | /* |
78 | * If the skb was allocated from pfmemalloc reserves, only | |
79 | * allow SOCK_MEMALLOC sockets to use it as this socket is | |
80 | * helping free memory | |
81 | */ | |
8fe809a9 ED |
82 | if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) { |
83 | NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP); | |
c93bdd0e | 84 | return -ENOMEM; |
8fe809a9 | 85 | } |
c11cd3a6 DM |
86 | err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); |
87 | if (err) | |
88 | return err; | |
89 | ||
43db6d65 SH |
90 | err = security_sock_rcv_skb(sk, skb); |
91 | if (err) | |
92 | return err; | |
93 | ||
80f8f102 ED |
94 | rcu_read_lock(); |
95 | filter = rcu_dereference(sk->sk_filter); | |
43db6d65 | 96 | if (filter) { |
8f917bba WB |
97 | struct sock *save_sk = skb->sk; |
98 | unsigned int pkt_len; | |
99 | ||
100 | skb->sk = sk; | |
101 | pkt_len = bpf_prog_run_save_cb(filter->prog, skb); | |
8f917bba | 102 | skb->sk = save_sk; |
d1f496fd | 103 | err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM; |
43db6d65 | 104 | } |
80f8f102 | 105 | rcu_read_unlock(); |
43db6d65 SH |
106 | |
107 | return err; | |
108 | } | |
f4979fce | 109 | EXPORT_SYMBOL(sk_filter_trim_cap); |
43db6d65 | 110 | |
f3694e00 | 111 | BPF_CALL_1(__skb_get_pay_offset, struct sk_buff *, skb) |
bd4cf0ed | 112 | { |
f3694e00 | 113 | return skb_get_poff(skb); |
bd4cf0ed AS |
114 | } |
115 | ||
f3694e00 | 116 | BPF_CALL_3(__skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x) |
bd4cf0ed | 117 | { |
bd4cf0ed AS |
118 | struct nlattr *nla; |
119 | ||
120 | if (skb_is_nonlinear(skb)) | |
121 | return 0; | |
122 | ||
05ab8f26 MK |
123 | if (skb->len < sizeof(struct nlattr)) |
124 | return 0; | |
125 | ||
30743837 | 126 | if (a > skb->len - sizeof(struct nlattr)) |
bd4cf0ed AS |
127 | return 0; |
128 | ||
30743837 | 129 | nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x); |
bd4cf0ed AS |
130 | if (nla) |
131 | return (void *) nla - (void *) skb->data; | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
f3694e00 | 136 | BPF_CALL_3(__skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x) |
bd4cf0ed | 137 | { |
bd4cf0ed AS |
138 | struct nlattr *nla; |
139 | ||
140 | if (skb_is_nonlinear(skb)) | |
141 | return 0; | |
142 | ||
05ab8f26 MK |
143 | if (skb->len < sizeof(struct nlattr)) |
144 | return 0; | |
145 | ||
30743837 | 146 | if (a > skb->len - sizeof(struct nlattr)) |
bd4cf0ed AS |
147 | return 0; |
148 | ||
30743837 DB |
149 | nla = (struct nlattr *) &skb->data[a]; |
150 | if (nla->nla_len > skb->len - a) | |
bd4cf0ed AS |
151 | return 0; |
152 | ||
30743837 | 153 | nla = nla_find_nested(nla, x); |
bd4cf0ed AS |
154 | if (nla) |
155 | return (void *) nla - (void *) skb->data; | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
f3694e00 | 160 | BPF_CALL_0(__get_raw_cpu_id) |
bd4cf0ed AS |
161 | { |
162 | return raw_smp_processor_id(); | |
163 | } | |
164 | ||
80b48c44 DB |
165 | static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = { |
166 | .func = __get_raw_cpu_id, | |
167 | .gpl_only = false, | |
168 | .ret_type = RET_INTEGER, | |
169 | }; | |
170 | ||
9bac3d6d AS |
171 | static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg, |
172 | struct bpf_insn *insn_buf) | |
173 | { | |
174 | struct bpf_insn *insn = insn_buf; | |
175 | ||
176 | switch (skb_field) { | |
177 | case SKF_AD_MARK: | |
178 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, mark) != 4); | |
179 | ||
180 | *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, | |
181 | offsetof(struct sk_buff, mark)); | |
182 | break; | |
183 | ||
184 | case SKF_AD_PKTTYPE: | |
185 | *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET()); | |
186 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX); | |
187 | #ifdef __BIG_ENDIAN_BITFIELD | |
188 | *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5); | |
189 | #endif | |
190 | break; | |
191 | ||
192 | case SKF_AD_QUEUE: | |
193 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, queue_mapping) != 2); | |
194 | ||
195 | *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, | |
196 | offsetof(struct sk_buff, queue_mapping)); | |
197 | break; | |
c2497395 | 198 | |
c2497395 AS |
199 | case SKF_AD_VLAN_TAG: |
200 | case SKF_AD_VLAN_TAG_PRESENT: | |
201 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2); | |
202 | BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000); | |
203 | ||
204 | /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */ | |
205 | *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, | |
206 | offsetof(struct sk_buff, vlan_tci)); | |
207 | if (skb_field == SKF_AD_VLAN_TAG) { | |
208 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, | |
209 | ~VLAN_TAG_PRESENT); | |
210 | } else { | |
211 | /* dst_reg >>= 12 */ | |
212 | *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 12); | |
213 | /* dst_reg &= 1 */ | |
214 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1); | |
215 | } | |
216 | break; | |
9bac3d6d AS |
217 | } |
218 | ||
219 | return insn - insn_buf; | |
220 | } | |
221 | ||
bd4cf0ed | 222 | static bool convert_bpf_extensions(struct sock_filter *fp, |
2695fb55 | 223 | struct bpf_insn **insnp) |
bd4cf0ed | 224 | { |
2695fb55 | 225 | struct bpf_insn *insn = *insnp; |
9bac3d6d | 226 | u32 cnt; |
bd4cf0ed AS |
227 | |
228 | switch (fp->k) { | |
229 | case SKF_AD_OFF + SKF_AD_PROTOCOL: | |
0b8c707d DB |
230 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, protocol) != 2); |
231 | ||
232 | /* A = *(u16 *) (CTX + offsetof(protocol)) */ | |
233 | *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, | |
234 | offsetof(struct sk_buff, protocol)); | |
235 | /* A = ntohs(A) [emitting a nop or swap16] */ | |
236 | *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); | |
bd4cf0ed AS |
237 | break; |
238 | ||
239 | case SKF_AD_OFF + SKF_AD_PKTTYPE: | |
9bac3d6d AS |
240 | cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn); |
241 | insn += cnt - 1; | |
bd4cf0ed AS |
242 | break; |
243 | ||
244 | case SKF_AD_OFF + SKF_AD_IFINDEX: | |
245 | case SKF_AD_OFF + SKF_AD_HATYPE: | |
bd4cf0ed AS |
246 | BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, ifindex) != 4); |
247 | BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, type) != 2); | |
f8f6d679 | 248 | |
f035a515 | 249 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
f8f6d679 DB |
250 | BPF_REG_TMP, BPF_REG_CTX, |
251 | offsetof(struct sk_buff, dev)); | |
252 | /* if (tmp != 0) goto pc + 1 */ | |
253 | *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1); | |
254 | *insn++ = BPF_EXIT_INSN(); | |
255 | if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX) | |
256 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP, | |
257 | offsetof(struct net_device, ifindex)); | |
258 | else | |
259 | *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP, | |
260 | offsetof(struct net_device, type)); | |
bd4cf0ed AS |
261 | break; |
262 | ||
263 | case SKF_AD_OFF + SKF_AD_MARK: | |
9bac3d6d AS |
264 | cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn); |
265 | insn += cnt - 1; | |
bd4cf0ed AS |
266 | break; |
267 | ||
268 | case SKF_AD_OFF + SKF_AD_RXHASH: | |
269 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, hash) != 4); | |
270 | ||
9739eef1 AS |
271 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, |
272 | offsetof(struct sk_buff, hash)); | |
bd4cf0ed AS |
273 | break; |
274 | ||
275 | case SKF_AD_OFF + SKF_AD_QUEUE: | |
9bac3d6d AS |
276 | cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn); |
277 | insn += cnt - 1; | |
bd4cf0ed AS |
278 | break; |
279 | ||
280 | case SKF_AD_OFF + SKF_AD_VLAN_TAG: | |
c2497395 AS |
281 | cnt = convert_skb_access(SKF_AD_VLAN_TAG, |
282 | BPF_REG_A, BPF_REG_CTX, insn); | |
283 | insn += cnt - 1; | |
284 | break; | |
bd4cf0ed | 285 | |
c2497395 AS |
286 | case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT: |
287 | cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT, | |
288 | BPF_REG_A, BPF_REG_CTX, insn); | |
289 | insn += cnt - 1; | |
bd4cf0ed AS |
290 | break; |
291 | ||
27cd5452 MS |
292 | case SKF_AD_OFF + SKF_AD_VLAN_TPID: |
293 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_proto) != 2); | |
294 | ||
295 | /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */ | |
296 | *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, | |
297 | offsetof(struct sk_buff, vlan_proto)); | |
298 | /* A = ntohs(A) [emitting a nop or swap16] */ | |
299 | *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); | |
300 | break; | |
301 | ||
bd4cf0ed AS |
302 | case SKF_AD_OFF + SKF_AD_PAY_OFFSET: |
303 | case SKF_AD_OFF + SKF_AD_NLATTR: | |
304 | case SKF_AD_OFF + SKF_AD_NLATTR_NEST: | |
305 | case SKF_AD_OFF + SKF_AD_CPU: | |
4cd3675e | 306 | case SKF_AD_OFF + SKF_AD_RANDOM: |
e430f34e | 307 | /* arg1 = CTX */ |
f8f6d679 | 308 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); |
bd4cf0ed | 309 | /* arg2 = A */ |
f8f6d679 | 310 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A); |
bd4cf0ed | 311 | /* arg3 = X */ |
f8f6d679 | 312 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X); |
e430f34e | 313 | /* Emit call(arg1=CTX, arg2=A, arg3=X) */ |
bd4cf0ed AS |
314 | switch (fp->k) { |
315 | case SKF_AD_OFF + SKF_AD_PAY_OFFSET: | |
f8f6d679 | 316 | *insn = BPF_EMIT_CALL(__skb_get_pay_offset); |
bd4cf0ed AS |
317 | break; |
318 | case SKF_AD_OFF + SKF_AD_NLATTR: | |
f8f6d679 | 319 | *insn = BPF_EMIT_CALL(__skb_get_nlattr); |
bd4cf0ed AS |
320 | break; |
321 | case SKF_AD_OFF + SKF_AD_NLATTR_NEST: | |
f8f6d679 | 322 | *insn = BPF_EMIT_CALL(__skb_get_nlattr_nest); |
bd4cf0ed AS |
323 | break; |
324 | case SKF_AD_OFF + SKF_AD_CPU: | |
f8f6d679 | 325 | *insn = BPF_EMIT_CALL(__get_raw_cpu_id); |
bd4cf0ed | 326 | break; |
4cd3675e | 327 | case SKF_AD_OFF + SKF_AD_RANDOM: |
3ad00405 DB |
328 | *insn = BPF_EMIT_CALL(bpf_user_rnd_u32); |
329 | bpf_user_rnd_init_once(); | |
4cd3675e | 330 | break; |
bd4cf0ed AS |
331 | } |
332 | break; | |
333 | ||
334 | case SKF_AD_OFF + SKF_AD_ALU_XOR_X: | |
9739eef1 AS |
335 | /* A ^= X */ |
336 | *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X); | |
bd4cf0ed AS |
337 | break; |
338 | ||
339 | default: | |
340 | /* This is just a dummy call to avoid letting the compiler | |
341 | * evict __bpf_call_base() as an optimization. Placed here | |
342 | * where no-one bothers. | |
343 | */ | |
344 | BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0); | |
345 | return false; | |
346 | } | |
347 | ||
348 | *insnp = insn; | |
349 | return true; | |
350 | } | |
351 | ||
352 | /** | |
8fb575ca | 353 | * bpf_convert_filter - convert filter program |
bd4cf0ed AS |
354 | * @prog: the user passed filter program |
355 | * @len: the length of the user passed filter program | |
50bbfed9 | 356 | * @new_prog: allocated 'struct bpf_prog' or NULL |
bd4cf0ed AS |
357 | * @new_len: pointer to store length of converted program |
358 | * | |
1f504ec9 TK |
359 | * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn' |
360 | * style extended BPF (eBPF). | |
bd4cf0ed AS |
361 | * Conversion workflow: |
362 | * | |
363 | * 1) First pass for calculating the new program length: | |
8fb575ca | 364 | * bpf_convert_filter(old_prog, old_len, NULL, &new_len) |
bd4cf0ed AS |
365 | * |
366 | * 2) 2nd pass to remap in two passes: 1st pass finds new | |
367 | * jump offsets, 2nd pass remapping: | |
8fb575ca | 368 | * bpf_convert_filter(old_prog, old_len, new_prog, &new_len); |
bd4cf0ed | 369 | */ |
d9e12f42 | 370 | static int bpf_convert_filter(struct sock_filter *prog, int len, |
50bbfed9 | 371 | struct bpf_prog *new_prog, int *new_len) |
bd4cf0ed | 372 | { |
50bbfed9 AS |
373 | int new_flen = 0, pass = 0, target, i, stack_off; |
374 | struct bpf_insn *new_insn, *first_insn = NULL; | |
bd4cf0ed AS |
375 | struct sock_filter *fp; |
376 | int *addrs = NULL; | |
377 | u8 bpf_src; | |
378 | ||
379 | BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); | |
30743837 | 380 | BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); |
bd4cf0ed | 381 | |
6f9a093b | 382 | if (len <= 0 || len > BPF_MAXINSNS) |
bd4cf0ed AS |
383 | return -EINVAL; |
384 | ||
385 | if (new_prog) { | |
50bbfed9 | 386 | first_insn = new_prog->insnsi; |
658da937 DB |
387 | addrs = kcalloc(len, sizeof(*addrs), |
388 | GFP_KERNEL | __GFP_NOWARN); | |
bd4cf0ed AS |
389 | if (!addrs) |
390 | return -ENOMEM; | |
391 | } | |
392 | ||
393 | do_pass: | |
50bbfed9 | 394 | new_insn = first_insn; |
bd4cf0ed AS |
395 | fp = prog; |
396 | ||
8b614aeb | 397 | /* Classic BPF related prologue emission. */ |
50bbfed9 | 398 | if (new_prog) { |
8b614aeb DB |
399 | /* Classic BPF expects A and X to be reset first. These need |
400 | * to be guaranteed to be the first two instructions. | |
401 | */ | |
402 | *new_insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); | |
403 | *new_insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_X, BPF_REG_X); | |
404 | ||
405 | /* All programs must keep CTX in callee saved BPF_REG_CTX. | |
406 | * In eBPF case it's done by the compiler, here we need to | |
407 | * do this ourself. Initial CTX is present in BPF_REG_ARG1. | |
408 | */ | |
409 | *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1); | |
410 | } else { | |
411 | new_insn += 3; | |
412 | } | |
bd4cf0ed AS |
413 | |
414 | for (i = 0; i < len; fp++, i++) { | |
2695fb55 AS |
415 | struct bpf_insn tmp_insns[6] = { }; |
416 | struct bpf_insn *insn = tmp_insns; | |
bd4cf0ed AS |
417 | |
418 | if (addrs) | |
50bbfed9 | 419 | addrs[i] = new_insn - first_insn; |
bd4cf0ed AS |
420 | |
421 | switch (fp->code) { | |
422 | /* All arithmetic insns and skb loads map as-is. */ | |
423 | case BPF_ALU | BPF_ADD | BPF_X: | |
424 | case BPF_ALU | BPF_ADD | BPF_K: | |
425 | case BPF_ALU | BPF_SUB | BPF_X: | |
426 | case BPF_ALU | BPF_SUB | BPF_K: | |
427 | case BPF_ALU | BPF_AND | BPF_X: | |
428 | case BPF_ALU | BPF_AND | BPF_K: | |
429 | case BPF_ALU | BPF_OR | BPF_X: | |
430 | case BPF_ALU | BPF_OR | BPF_K: | |
431 | case BPF_ALU | BPF_LSH | BPF_X: | |
432 | case BPF_ALU | BPF_LSH | BPF_K: | |
433 | case BPF_ALU | BPF_RSH | BPF_X: | |
434 | case BPF_ALU | BPF_RSH | BPF_K: | |
435 | case BPF_ALU | BPF_XOR | BPF_X: | |
436 | case BPF_ALU | BPF_XOR | BPF_K: | |
437 | case BPF_ALU | BPF_MUL | BPF_X: | |
438 | case BPF_ALU | BPF_MUL | BPF_K: | |
439 | case BPF_ALU | BPF_DIV | BPF_X: | |
440 | case BPF_ALU | BPF_DIV | BPF_K: | |
441 | case BPF_ALU | BPF_MOD | BPF_X: | |
442 | case BPF_ALU | BPF_MOD | BPF_K: | |
443 | case BPF_ALU | BPF_NEG: | |
444 | case BPF_LD | BPF_ABS | BPF_W: | |
445 | case BPF_LD | BPF_ABS | BPF_H: | |
446 | case BPF_LD | BPF_ABS | BPF_B: | |
447 | case BPF_LD | BPF_IND | BPF_W: | |
448 | case BPF_LD | BPF_IND | BPF_H: | |
449 | case BPF_LD | BPF_IND | BPF_B: | |
450 | /* Check for overloaded BPF extension and | |
451 | * directly convert it if found, otherwise | |
452 | * just move on with mapping. | |
453 | */ | |
454 | if (BPF_CLASS(fp->code) == BPF_LD && | |
455 | BPF_MODE(fp->code) == BPF_ABS && | |
456 | convert_bpf_extensions(fp, &insn)) | |
457 | break; | |
458 | ||
f8f6d679 | 459 | *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k); |
bd4cf0ed AS |
460 | break; |
461 | ||
f8f6d679 DB |
462 | /* Jump transformation cannot use BPF block macros |
463 | * everywhere as offset calculation and target updates | |
464 | * require a bit more work than the rest, i.e. jump | |
465 | * opcodes map as-is, but offsets need adjustment. | |
466 | */ | |
467 | ||
468 | #define BPF_EMIT_JMP \ | |
bd4cf0ed AS |
469 | do { \ |
470 | if (target >= len || target < 0) \ | |
471 | goto err; \ | |
472 | insn->off = addrs ? addrs[target] - addrs[i] - 1 : 0; \ | |
473 | /* Adjust pc relative offset for 2nd or 3rd insn. */ \ | |
474 | insn->off -= insn - tmp_insns; \ | |
475 | } while (0) | |
476 | ||
f8f6d679 DB |
477 | case BPF_JMP | BPF_JA: |
478 | target = i + fp->k + 1; | |
479 | insn->code = fp->code; | |
480 | BPF_EMIT_JMP; | |
bd4cf0ed AS |
481 | break; |
482 | ||
483 | case BPF_JMP | BPF_JEQ | BPF_K: | |
484 | case BPF_JMP | BPF_JEQ | BPF_X: | |
485 | case BPF_JMP | BPF_JSET | BPF_K: | |
486 | case BPF_JMP | BPF_JSET | BPF_X: | |
487 | case BPF_JMP | BPF_JGT | BPF_K: | |
488 | case BPF_JMP | BPF_JGT | BPF_X: | |
489 | case BPF_JMP | BPF_JGE | BPF_K: | |
490 | case BPF_JMP | BPF_JGE | BPF_X: | |
491 | if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) { | |
492 | /* BPF immediates are signed, zero extend | |
493 | * immediate into tmp register and use it | |
494 | * in compare insn. | |
495 | */ | |
f8f6d679 | 496 | *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k); |
bd4cf0ed | 497 | |
e430f34e AS |
498 | insn->dst_reg = BPF_REG_A; |
499 | insn->src_reg = BPF_REG_TMP; | |
bd4cf0ed AS |
500 | bpf_src = BPF_X; |
501 | } else { | |
e430f34e | 502 | insn->dst_reg = BPF_REG_A; |
bd4cf0ed AS |
503 | insn->imm = fp->k; |
504 | bpf_src = BPF_SRC(fp->code); | |
19539ce7 | 505 | insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0; |
1da177e4 | 506 | } |
bd4cf0ed AS |
507 | |
508 | /* Common case where 'jump_false' is next insn. */ | |
509 | if (fp->jf == 0) { | |
510 | insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; | |
511 | target = i + fp->jt + 1; | |
f8f6d679 | 512 | BPF_EMIT_JMP; |
bd4cf0ed | 513 | break; |
1da177e4 | 514 | } |
bd4cf0ed AS |
515 | |
516 | /* Convert JEQ into JNE when 'jump_true' is next insn. */ | |
517 | if (fp->jt == 0 && BPF_OP(fp->code) == BPF_JEQ) { | |
518 | insn->code = BPF_JMP | BPF_JNE | bpf_src; | |
519 | target = i + fp->jf + 1; | |
f8f6d679 | 520 | BPF_EMIT_JMP; |
bd4cf0ed | 521 | break; |
0b05b2a4 | 522 | } |
bd4cf0ed AS |
523 | |
524 | /* Other jumps are mapped into two insns: Jxx and JA. */ | |
525 | target = i + fp->jt + 1; | |
526 | insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; | |
f8f6d679 | 527 | BPF_EMIT_JMP; |
bd4cf0ed AS |
528 | insn++; |
529 | ||
530 | insn->code = BPF_JMP | BPF_JA; | |
531 | target = i + fp->jf + 1; | |
f8f6d679 | 532 | BPF_EMIT_JMP; |
bd4cf0ed AS |
533 | break; |
534 | ||
535 | /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */ | |
536 | case BPF_LDX | BPF_MSH | BPF_B: | |
9739eef1 | 537 | /* tmp = A */ |
f8f6d679 | 538 | *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_A); |
1268e253 | 539 | /* A = BPF_R0 = *(u8 *) (skb->data + K) */ |
f8f6d679 | 540 | *insn++ = BPF_LD_ABS(BPF_B, fp->k); |
9739eef1 | 541 | /* A &= 0xf */ |
f8f6d679 | 542 | *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf); |
9739eef1 | 543 | /* A <<= 2 */ |
f8f6d679 | 544 | *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2); |
9739eef1 | 545 | /* X = A */ |
f8f6d679 | 546 | *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
9739eef1 | 547 | /* A = tmp */ |
f8f6d679 | 548 | *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP); |
bd4cf0ed AS |
549 | break; |
550 | ||
6205b9cf DB |
551 | /* RET_K is remaped into 2 insns. RET_A case doesn't need an |
552 | * extra mov as BPF_REG_0 is already mapped into BPF_REG_A. | |
553 | */ | |
bd4cf0ed AS |
554 | case BPF_RET | BPF_A: |
555 | case BPF_RET | BPF_K: | |
6205b9cf DB |
556 | if (BPF_RVAL(fp->code) == BPF_K) |
557 | *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0, | |
558 | 0, fp->k); | |
9739eef1 | 559 | *insn = BPF_EXIT_INSN(); |
bd4cf0ed AS |
560 | break; |
561 | ||
562 | /* Store to stack. */ | |
563 | case BPF_ST: | |
564 | case BPF_STX: | |
50bbfed9 | 565 | stack_off = fp->k * 4 + 4; |
f8f6d679 DB |
566 | *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) == |
567 | BPF_ST ? BPF_REG_A : BPF_REG_X, | |
50bbfed9 AS |
568 | -stack_off); |
569 | /* check_load_and_stores() verifies that classic BPF can | |
570 | * load from stack only after write, so tracking | |
571 | * stack_depth for ST|STX insns is enough | |
572 | */ | |
573 | if (new_prog && new_prog->aux->stack_depth < stack_off) | |
574 | new_prog->aux->stack_depth = stack_off; | |
bd4cf0ed AS |
575 | break; |
576 | ||
577 | /* Load from stack. */ | |
578 | case BPF_LD | BPF_MEM: | |
579 | case BPF_LDX | BPF_MEM: | |
50bbfed9 | 580 | stack_off = fp->k * 4 + 4; |
f8f6d679 DB |
581 | *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? |
582 | BPF_REG_A : BPF_REG_X, BPF_REG_FP, | |
50bbfed9 | 583 | -stack_off); |
bd4cf0ed AS |
584 | break; |
585 | ||
586 | /* A = K or X = K */ | |
587 | case BPF_LD | BPF_IMM: | |
588 | case BPF_LDX | BPF_IMM: | |
f8f6d679 DB |
589 | *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ? |
590 | BPF_REG_A : BPF_REG_X, fp->k); | |
bd4cf0ed AS |
591 | break; |
592 | ||
593 | /* X = A */ | |
594 | case BPF_MISC | BPF_TAX: | |
f8f6d679 | 595 | *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
bd4cf0ed AS |
596 | break; |
597 | ||
598 | /* A = X */ | |
599 | case BPF_MISC | BPF_TXA: | |
f8f6d679 | 600 | *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X); |
bd4cf0ed AS |
601 | break; |
602 | ||
603 | /* A = skb->len or X = skb->len */ | |
604 | case BPF_LD | BPF_W | BPF_LEN: | |
605 | case BPF_LDX | BPF_W | BPF_LEN: | |
f8f6d679 DB |
606 | *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? |
607 | BPF_REG_A : BPF_REG_X, BPF_REG_CTX, | |
608 | offsetof(struct sk_buff, len)); | |
bd4cf0ed AS |
609 | break; |
610 | ||
f8f6d679 | 611 | /* Access seccomp_data fields. */ |
bd4cf0ed | 612 | case BPF_LDX | BPF_ABS | BPF_W: |
9739eef1 AS |
613 | /* A = *(u32 *) (ctx + K) */ |
614 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); | |
bd4cf0ed AS |
615 | break; |
616 | ||
ca9f1fd2 | 617 | /* Unknown instruction. */ |
1da177e4 | 618 | default: |
bd4cf0ed | 619 | goto err; |
1da177e4 | 620 | } |
bd4cf0ed AS |
621 | |
622 | insn++; | |
623 | if (new_prog) | |
624 | memcpy(new_insn, tmp_insns, | |
625 | sizeof(*insn) * (insn - tmp_insns)); | |
bd4cf0ed | 626 | new_insn += insn - tmp_insns; |
1da177e4 LT |
627 | } |
628 | ||
bd4cf0ed AS |
629 | if (!new_prog) { |
630 | /* Only calculating new length. */ | |
50bbfed9 | 631 | *new_len = new_insn - first_insn; |
bd4cf0ed AS |
632 | return 0; |
633 | } | |
634 | ||
635 | pass++; | |
50bbfed9 AS |
636 | if (new_flen != new_insn - first_insn) { |
637 | new_flen = new_insn - first_insn; | |
bd4cf0ed AS |
638 | if (pass > 2) |
639 | goto err; | |
bd4cf0ed AS |
640 | goto do_pass; |
641 | } | |
642 | ||
643 | kfree(addrs); | |
644 | BUG_ON(*new_len != new_flen); | |
1da177e4 | 645 | return 0; |
bd4cf0ed AS |
646 | err: |
647 | kfree(addrs); | |
648 | return -EINVAL; | |
1da177e4 LT |
649 | } |
650 | ||
bd4cf0ed | 651 | /* Security: |
bd4cf0ed | 652 | * |
2d5311e4 | 653 | * As we dont want to clear mem[] array for each packet going through |
8ea6e345 | 654 | * __bpf_prog_run(), we check that filter loaded by user never try to read |
2d5311e4 | 655 | * a cell if not previously written, and we check all branches to be sure |
25985edc | 656 | * a malicious user doesn't try to abuse us. |
2d5311e4 | 657 | */ |
ec31a05c | 658 | static int check_load_and_stores(const struct sock_filter *filter, int flen) |
2d5311e4 | 659 | { |
34805931 | 660 | u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ |
2d5311e4 ED |
661 | int pc, ret = 0; |
662 | ||
663 | BUILD_BUG_ON(BPF_MEMWORDS > 16); | |
34805931 | 664 | |
99e72a0f | 665 | masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL); |
2d5311e4 ED |
666 | if (!masks) |
667 | return -ENOMEM; | |
34805931 | 668 | |
2d5311e4 ED |
669 | memset(masks, 0xff, flen * sizeof(*masks)); |
670 | ||
671 | for (pc = 0; pc < flen; pc++) { | |
672 | memvalid &= masks[pc]; | |
673 | ||
674 | switch (filter[pc].code) { | |
34805931 DB |
675 | case BPF_ST: |
676 | case BPF_STX: | |
2d5311e4 ED |
677 | memvalid |= (1 << filter[pc].k); |
678 | break; | |
34805931 DB |
679 | case BPF_LD | BPF_MEM: |
680 | case BPF_LDX | BPF_MEM: | |
2d5311e4 ED |
681 | if (!(memvalid & (1 << filter[pc].k))) { |
682 | ret = -EINVAL; | |
683 | goto error; | |
684 | } | |
685 | break; | |
34805931 DB |
686 | case BPF_JMP | BPF_JA: |
687 | /* A jump must set masks on target */ | |
2d5311e4 ED |
688 | masks[pc + 1 + filter[pc].k] &= memvalid; |
689 | memvalid = ~0; | |
690 | break; | |
34805931 DB |
691 | case BPF_JMP | BPF_JEQ | BPF_K: |
692 | case BPF_JMP | BPF_JEQ | BPF_X: | |
693 | case BPF_JMP | BPF_JGE | BPF_K: | |
694 | case BPF_JMP | BPF_JGE | BPF_X: | |
695 | case BPF_JMP | BPF_JGT | BPF_K: | |
696 | case BPF_JMP | BPF_JGT | BPF_X: | |
697 | case BPF_JMP | BPF_JSET | BPF_K: | |
698 | case BPF_JMP | BPF_JSET | BPF_X: | |
699 | /* A jump must set masks on targets */ | |
2d5311e4 ED |
700 | masks[pc + 1 + filter[pc].jt] &= memvalid; |
701 | masks[pc + 1 + filter[pc].jf] &= memvalid; | |
702 | memvalid = ~0; | |
703 | break; | |
704 | } | |
705 | } | |
706 | error: | |
707 | kfree(masks); | |
708 | return ret; | |
709 | } | |
710 | ||
34805931 DB |
711 | static bool chk_code_allowed(u16 code_to_probe) |
712 | { | |
713 | static const bool codes[] = { | |
714 | /* 32 bit ALU operations */ | |
715 | [BPF_ALU | BPF_ADD | BPF_K] = true, | |
716 | [BPF_ALU | BPF_ADD | BPF_X] = true, | |
717 | [BPF_ALU | BPF_SUB | BPF_K] = true, | |
718 | [BPF_ALU | BPF_SUB | BPF_X] = true, | |
719 | [BPF_ALU | BPF_MUL | BPF_K] = true, | |
720 | [BPF_ALU | BPF_MUL | BPF_X] = true, | |
721 | [BPF_ALU | BPF_DIV | BPF_K] = true, | |
722 | [BPF_ALU | BPF_DIV | BPF_X] = true, | |
723 | [BPF_ALU | BPF_MOD | BPF_K] = true, | |
724 | [BPF_ALU | BPF_MOD | BPF_X] = true, | |
725 | [BPF_ALU | BPF_AND | BPF_K] = true, | |
726 | [BPF_ALU | BPF_AND | BPF_X] = true, | |
727 | [BPF_ALU | BPF_OR | BPF_K] = true, | |
728 | [BPF_ALU | BPF_OR | BPF_X] = true, | |
729 | [BPF_ALU | BPF_XOR | BPF_K] = true, | |
730 | [BPF_ALU | BPF_XOR | BPF_X] = true, | |
731 | [BPF_ALU | BPF_LSH | BPF_K] = true, | |
732 | [BPF_ALU | BPF_LSH | BPF_X] = true, | |
733 | [BPF_ALU | BPF_RSH | BPF_K] = true, | |
734 | [BPF_ALU | BPF_RSH | BPF_X] = true, | |
735 | [BPF_ALU | BPF_NEG] = true, | |
736 | /* Load instructions */ | |
737 | [BPF_LD | BPF_W | BPF_ABS] = true, | |
738 | [BPF_LD | BPF_H | BPF_ABS] = true, | |
739 | [BPF_LD | BPF_B | BPF_ABS] = true, | |
740 | [BPF_LD | BPF_W | BPF_LEN] = true, | |
741 | [BPF_LD | BPF_W | BPF_IND] = true, | |
742 | [BPF_LD | BPF_H | BPF_IND] = true, | |
743 | [BPF_LD | BPF_B | BPF_IND] = true, | |
744 | [BPF_LD | BPF_IMM] = true, | |
745 | [BPF_LD | BPF_MEM] = true, | |
746 | [BPF_LDX | BPF_W | BPF_LEN] = true, | |
747 | [BPF_LDX | BPF_B | BPF_MSH] = true, | |
748 | [BPF_LDX | BPF_IMM] = true, | |
749 | [BPF_LDX | BPF_MEM] = true, | |
750 | /* Store instructions */ | |
751 | [BPF_ST] = true, | |
752 | [BPF_STX] = true, | |
753 | /* Misc instructions */ | |
754 | [BPF_MISC | BPF_TAX] = true, | |
755 | [BPF_MISC | BPF_TXA] = true, | |
756 | /* Return instructions */ | |
757 | [BPF_RET | BPF_K] = true, | |
758 | [BPF_RET | BPF_A] = true, | |
759 | /* Jump instructions */ | |
760 | [BPF_JMP | BPF_JA] = true, | |
761 | [BPF_JMP | BPF_JEQ | BPF_K] = true, | |
762 | [BPF_JMP | BPF_JEQ | BPF_X] = true, | |
763 | [BPF_JMP | BPF_JGE | BPF_K] = true, | |
764 | [BPF_JMP | BPF_JGE | BPF_X] = true, | |
765 | [BPF_JMP | BPF_JGT | BPF_K] = true, | |
766 | [BPF_JMP | BPF_JGT | BPF_X] = true, | |
767 | [BPF_JMP | BPF_JSET | BPF_K] = true, | |
768 | [BPF_JMP | BPF_JSET | BPF_X] = true, | |
769 | }; | |
770 | ||
771 | if (code_to_probe >= ARRAY_SIZE(codes)) | |
772 | return false; | |
773 | ||
774 | return codes[code_to_probe]; | |
775 | } | |
776 | ||
f7bd9e36 DB |
777 | static bool bpf_check_basics_ok(const struct sock_filter *filter, |
778 | unsigned int flen) | |
779 | { | |
780 | if (filter == NULL) | |
781 | return false; | |
782 | if (flen == 0 || flen > BPF_MAXINSNS) | |
783 | return false; | |
784 | ||
785 | return true; | |
786 | } | |
787 | ||
1da177e4 | 788 | /** |
4df95ff4 | 789 | * bpf_check_classic - verify socket filter code |
1da177e4 LT |
790 | * @filter: filter to verify |
791 | * @flen: length of filter | |
792 | * | |
793 | * Check the user's filter code. If we let some ugly | |
794 | * filter code slip through kaboom! The filter must contain | |
93699863 KK |
795 | * no references or jumps that are out of range, no illegal |
796 | * instructions, and must end with a RET instruction. | |
1da177e4 | 797 | * |
7b11f69f KK |
798 | * All jumps are forward as they are not signed. |
799 | * | |
800 | * Returns 0 if the rule set is legal or -EINVAL if not. | |
1da177e4 | 801 | */ |
d9e12f42 NS |
802 | static int bpf_check_classic(const struct sock_filter *filter, |
803 | unsigned int flen) | |
1da177e4 | 804 | { |
aa1113d9 | 805 | bool anc_found; |
34805931 | 806 | int pc; |
1da177e4 | 807 | |
34805931 | 808 | /* Check the filter code now */ |
1da177e4 | 809 | for (pc = 0; pc < flen; pc++) { |
ec31a05c | 810 | const struct sock_filter *ftest = &filter[pc]; |
93699863 | 811 | |
34805931 DB |
812 | /* May we actually operate on this code? */ |
813 | if (!chk_code_allowed(ftest->code)) | |
cba328fc | 814 | return -EINVAL; |
34805931 | 815 | |
93699863 | 816 | /* Some instructions need special checks */ |
34805931 DB |
817 | switch (ftest->code) { |
818 | case BPF_ALU | BPF_DIV | BPF_K: | |
819 | case BPF_ALU | BPF_MOD | BPF_K: | |
820 | /* Check for division by zero */ | |
b6069a95 ED |
821 | if (ftest->k == 0) |
822 | return -EINVAL; | |
823 | break; | |
229394e8 RV |
824 | case BPF_ALU | BPF_LSH | BPF_K: |
825 | case BPF_ALU | BPF_RSH | BPF_K: | |
826 | if (ftest->k >= 32) | |
827 | return -EINVAL; | |
828 | break; | |
34805931 DB |
829 | case BPF_LD | BPF_MEM: |
830 | case BPF_LDX | BPF_MEM: | |
831 | case BPF_ST: | |
832 | case BPF_STX: | |
833 | /* Check for invalid memory addresses */ | |
93699863 KK |
834 | if (ftest->k >= BPF_MEMWORDS) |
835 | return -EINVAL; | |
836 | break; | |
34805931 DB |
837 | case BPF_JMP | BPF_JA: |
838 | /* Note, the large ftest->k might cause loops. | |
93699863 KK |
839 | * Compare this with conditional jumps below, |
840 | * where offsets are limited. --ANK (981016) | |
841 | */ | |
34805931 | 842 | if (ftest->k >= (unsigned int)(flen - pc - 1)) |
93699863 | 843 | return -EINVAL; |
01f2f3f6 | 844 | break; |
34805931 DB |
845 | case BPF_JMP | BPF_JEQ | BPF_K: |
846 | case BPF_JMP | BPF_JEQ | BPF_X: | |
847 | case BPF_JMP | BPF_JGE | BPF_K: | |
848 | case BPF_JMP | BPF_JGE | BPF_X: | |
849 | case BPF_JMP | BPF_JGT | BPF_K: | |
850 | case BPF_JMP | BPF_JGT | BPF_X: | |
851 | case BPF_JMP | BPF_JSET | BPF_K: | |
852 | case BPF_JMP | BPF_JSET | BPF_X: | |
853 | /* Both conditionals must be safe */ | |
e35bedf3 | 854 | if (pc + ftest->jt + 1 >= flen || |
93699863 KK |
855 | pc + ftest->jf + 1 >= flen) |
856 | return -EINVAL; | |
cba328fc | 857 | break; |
34805931 DB |
858 | case BPF_LD | BPF_W | BPF_ABS: |
859 | case BPF_LD | BPF_H | BPF_ABS: | |
860 | case BPF_LD | BPF_B | BPF_ABS: | |
aa1113d9 | 861 | anc_found = false; |
34805931 DB |
862 | if (bpf_anc_helper(ftest) & BPF_ANC) |
863 | anc_found = true; | |
864 | /* Ancillary operation unknown or unsupported */ | |
aa1113d9 DB |
865 | if (anc_found == false && ftest->k >= SKF_AD_OFF) |
866 | return -EINVAL; | |
01f2f3f6 HPP |
867 | } |
868 | } | |
93699863 | 869 | |
34805931 | 870 | /* Last instruction must be a RET code */ |
01f2f3f6 | 871 | switch (filter[flen - 1].code) { |
34805931 DB |
872 | case BPF_RET | BPF_K: |
873 | case BPF_RET | BPF_A: | |
2d5311e4 | 874 | return check_load_and_stores(filter, flen); |
cba328fc | 875 | } |
34805931 | 876 | |
cba328fc | 877 | return -EINVAL; |
1da177e4 LT |
878 | } |
879 | ||
7ae457c1 AS |
880 | static int bpf_prog_store_orig_filter(struct bpf_prog *fp, |
881 | const struct sock_fprog *fprog) | |
a3ea269b | 882 | { |
009937e7 | 883 | unsigned int fsize = bpf_classic_proglen(fprog); |
a3ea269b DB |
884 | struct sock_fprog_kern *fkprog; |
885 | ||
886 | fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL); | |
887 | if (!fp->orig_prog) | |
888 | return -ENOMEM; | |
889 | ||
890 | fkprog = fp->orig_prog; | |
891 | fkprog->len = fprog->len; | |
658da937 DB |
892 | |
893 | fkprog->filter = kmemdup(fp->insns, fsize, | |
894 | GFP_KERNEL | __GFP_NOWARN); | |
a3ea269b DB |
895 | if (!fkprog->filter) { |
896 | kfree(fp->orig_prog); | |
897 | return -ENOMEM; | |
898 | } | |
899 | ||
900 | return 0; | |
901 | } | |
902 | ||
7ae457c1 | 903 | static void bpf_release_orig_filter(struct bpf_prog *fp) |
a3ea269b DB |
904 | { |
905 | struct sock_fprog_kern *fprog = fp->orig_prog; | |
906 | ||
907 | if (fprog) { | |
908 | kfree(fprog->filter); | |
909 | kfree(fprog); | |
910 | } | |
911 | } | |
912 | ||
7ae457c1 AS |
913 | static void __bpf_prog_release(struct bpf_prog *prog) |
914 | { | |
24701ece | 915 | if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) { |
89aa0758 AS |
916 | bpf_prog_put(prog); |
917 | } else { | |
918 | bpf_release_orig_filter(prog); | |
919 | bpf_prog_free(prog); | |
920 | } | |
7ae457c1 AS |
921 | } |
922 | ||
34c5bd66 PN |
923 | static void __sk_filter_release(struct sk_filter *fp) |
924 | { | |
7ae457c1 AS |
925 | __bpf_prog_release(fp->prog); |
926 | kfree(fp); | |
34c5bd66 PN |
927 | } |
928 | ||
47e958ea | 929 | /** |
46bcf14f | 930 | * sk_filter_release_rcu - Release a socket filter by rcu_head |
47e958ea PE |
931 | * @rcu: rcu_head that contains the sk_filter to free |
932 | */ | |
fbc907f0 | 933 | static void sk_filter_release_rcu(struct rcu_head *rcu) |
47e958ea PE |
934 | { |
935 | struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); | |
936 | ||
34c5bd66 | 937 | __sk_filter_release(fp); |
47e958ea | 938 | } |
fbc907f0 DB |
939 | |
940 | /** | |
941 | * sk_filter_release - release a socket filter | |
942 | * @fp: filter to remove | |
943 | * | |
944 | * Remove a filter from a socket and release its resources. | |
945 | */ | |
946 | static void sk_filter_release(struct sk_filter *fp) | |
947 | { | |
4c355cdf | 948 | if (refcount_dec_and_test(&fp->refcnt)) |
fbc907f0 DB |
949 | call_rcu(&fp->rcu, sk_filter_release_rcu); |
950 | } | |
951 | ||
952 | void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) | |
953 | { | |
7ae457c1 | 954 | u32 filter_size = bpf_prog_size(fp->prog->len); |
fbc907f0 | 955 | |
278571ba AS |
956 | atomic_sub(filter_size, &sk->sk_omem_alloc); |
957 | sk_filter_release(fp); | |
fbc907f0 | 958 | } |
47e958ea | 959 | |
278571ba AS |
960 | /* try to charge the socket memory if there is space available |
961 | * return true on success | |
962 | */ | |
4c355cdf | 963 | static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
bd4cf0ed | 964 | { |
7ae457c1 | 965 | u32 filter_size = bpf_prog_size(fp->prog->len); |
278571ba AS |
966 | |
967 | /* same check as in sock_kmalloc() */ | |
968 | if (filter_size <= sysctl_optmem_max && | |
969 | atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) { | |
278571ba AS |
970 | atomic_add(filter_size, &sk->sk_omem_alloc); |
971 | return true; | |
bd4cf0ed | 972 | } |
278571ba | 973 | return false; |
bd4cf0ed AS |
974 | } |
975 | ||
4c355cdf RE |
976 | bool sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
977 | { | |
978 | bool ret = __sk_filter_charge(sk, fp); | |
979 | if (ret) | |
980 | refcount_inc(&fp->refcnt); | |
981 | return ret; | |
982 | } | |
983 | ||
7ae457c1 | 984 | static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp) |
bd4cf0ed AS |
985 | { |
986 | struct sock_filter *old_prog; | |
7ae457c1 | 987 | struct bpf_prog *old_fp; |
34805931 | 988 | int err, new_len, old_len = fp->len; |
bd4cf0ed AS |
989 | |
990 | /* We are free to overwrite insns et al right here as it | |
991 | * won't be used at this point in time anymore internally | |
992 | * after the migration to the internal BPF instruction | |
993 | * representation. | |
994 | */ | |
995 | BUILD_BUG_ON(sizeof(struct sock_filter) != | |
2695fb55 | 996 | sizeof(struct bpf_insn)); |
bd4cf0ed | 997 | |
bd4cf0ed AS |
998 | /* Conversion cannot happen on overlapping memory areas, |
999 | * so we need to keep the user BPF around until the 2nd | |
1000 | * pass. At this time, the user BPF is stored in fp->insns. | |
1001 | */ | |
1002 | old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter), | |
658da937 | 1003 | GFP_KERNEL | __GFP_NOWARN); |
bd4cf0ed AS |
1004 | if (!old_prog) { |
1005 | err = -ENOMEM; | |
1006 | goto out_err; | |
1007 | } | |
1008 | ||
1009 | /* 1st pass: calculate the new program length. */ | |
8fb575ca | 1010 | err = bpf_convert_filter(old_prog, old_len, NULL, &new_len); |
bd4cf0ed AS |
1011 | if (err) |
1012 | goto out_err_free; | |
1013 | ||
1014 | /* Expand fp for appending the new filter representation. */ | |
1015 | old_fp = fp; | |
60a3b225 | 1016 | fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0); |
bd4cf0ed AS |
1017 | if (!fp) { |
1018 | /* The old_fp is still around in case we couldn't | |
1019 | * allocate new memory, so uncharge on that one. | |
1020 | */ | |
1021 | fp = old_fp; | |
1022 | err = -ENOMEM; | |
1023 | goto out_err_free; | |
1024 | } | |
1025 | ||
bd4cf0ed AS |
1026 | fp->len = new_len; |
1027 | ||
2695fb55 | 1028 | /* 2nd pass: remap sock_filter insns into bpf_insn insns. */ |
50bbfed9 | 1029 | err = bpf_convert_filter(old_prog, old_len, fp, &new_len); |
bd4cf0ed | 1030 | if (err) |
8fb575ca | 1031 | /* 2nd bpf_convert_filter() can fail only if it fails |
bd4cf0ed AS |
1032 | * to allocate memory, remapping must succeed. Note, |
1033 | * that at this time old_fp has already been released | |
278571ba | 1034 | * by krealloc(). |
bd4cf0ed AS |
1035 | */ |
1036 | goto out_err_free; | |
1037 | ||
d1c55ab5 DB |
1038 | /* We are guaranteed to never error here with cBPF to eBPF |
1039 | * transitions, since there's no issue with type compatibility | |
1040 | * checks on program arrays. | |
1041 | */ | |
1042 | fp = bpf_prog_select_runtime(fp, &err); | |
5fe821a9 | 1043 | |
bd4cf0ed AS |
1044 | kfree(old_prog); |
1045 | return fp; | |
1046 | ||
1047 | out_err_free: | |
1048 | kfree(old_prog); | |
1049 | out_err: | |
7ae457c1 | 1050 | __bpf_prog_release(fp); |
bd4cf0ed AS |
1051 | return ERR_PTR(err); |
1052 | } | |
1053 | ||
ac67eb2c DB |
1054 | static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp, |
1055 | bpf_aux_classic_check_t trans) | |
302d6637 JP |
1056 | { |
1057 | int err; | |
1058 | ||
bd4cf0ed | 1059 | fp->bpf_func = NULL; |
a91263d5 | 1060 | fp->jited = 0; |
302d6637 | 1061 | |
4df95ff4 | 1062 | err = bpf_check_classic(fp->insns, fp->len); |
418c96ac | 1063 | if (err) { |
7ae457c1 | 1064 | __bpf_prog_release(fp); |
bd4cf0ed | 1065 | return ERR_PTR(err); |
418c96ac | 1066 | } |
302d6637 | 1067 | |
4ae92bc7 NS |
1068 | /* There might be additional checks and transformations |
1069 | * needed on classic filters, f.e. in case of seccomp. | |
1070 | */ | |
1071 | if (trans) { | |
1072 | err = trans(fp->insns, fp->len); | |
1073 | if (err) { | |
1074 | __bpf_prog_release(fp); | |
1075 | return ERR_PTR(err); | |
1076 | } | |
1077 | } | |
1078 | ||
bd4cf0ed AS |
1079 | /* Probe if we can JIT compile the filter and if so, do |
1080 | * the compilation of the filter. | |
1081 | */ | |
302d6637 | 1082 | bpf_jit_compile(fp); |
bd4cf0ed AS |
1083 | |
1084 | /* JIT compiler couldn't process this filter, so do the | |
1085 | * internal BPF translation for the optimized interpreter. | |
1086 | */ | |
5fe821a9 | 1087 | if (!fp->jited) |
7ae457c1 | 1088 | fp = bpf_migrate_filter(fp); |
bd4cf0ed AS |
1089 | |
1090 | return fp; | |
302d6637 JP |
1091 | } |
1092 | ||
1093 | /** | |
7ae457c1 | 1094 | * bpf_prog_create - create an unattached filter |
c6c4b97c | 1095 | * @pfp: the unattached filter that is created |
677a9fd3 | 1096 | * @fprog: the filter program |
302d6637 | 1097 | * |
c6c4b97c | 1098 | * Create a filter independent of any socket. We first run some |
302d6637 JP |
1099 | * sanity checks on it to make sure it does not explode on us later. |
1100 | * If an error occurs or there is insufficient memory for the filter | |
1101 | * a negative errno code is returned. On success the return is zero. | |
1102 | */ | |
7ae457c1 | 1103 | int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog) |
302d6637 | 1104 | { |
009937e7 | 1105 | unsigned int fsize = bpf_classic_proglen(fprog); |
7ae457c1 | 1106 | struct bpf_prog *fp; |
302d6637 JP |
1107 | |
1108 | /* Make sure new filter is there and in the right amounts. */ | |
f7bd9e36 | 1109 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
302d6637 JP |
1110 | return -EINVAL; |
1111 | ||
60a3b225 | 1112 | fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
302d6637 JP |
1113 | if (!fp) |
1114 | return -ENOMEM; | |
a3ea269b | 1115 | |
302d6637 JP |
1116 | memcpy(fp->insns, fprog->filter, fsize); |
1117 | ||
302d6637 | 1118 | fp->len = fprog->len; |
a3ea269b DB |
1119 | /* Since unattached filters are not copied back to user |
1120 | * space through sk_get_filter(), we do not need to hold | |
1121 | * a copy here, and can spare us the work. | |
1122 | */ | |
1123 | fp->orig_prog = NULL; | |
302d6637 | 1124 | |
7ae457c1 | 1125 | /* bpf_prepare_filter() already takes care of freeing |
bd4cf0ed AS |
1126 | * memory in case something goes wrong. |
1127 | */ | |
4ae92bc7 | 1128 | fp = bpf_prepare_filter(fp, NULL); |
bd4cf0ed AS |
1129 | if (IS_ERR(fp)) |
1130 | return PTR_ERR(fp); | |
302d6637 JP |
1131 | |
1132 | *pfp = fp; | |
1133 | return 0; | |
302d6637 | 1134 | } |
7ae457c1 | 1135 | EXPORT_SYMBOL_GPL(bpf_prog_create); |
302d6637 | 1136 | |
ac67eb2c DB |
1137 | /** |
1138 | * bpf_prog_create_from_user - create an unattached filter from user buffer | |
1139 | * @pfp: the unattached filter that is created | |
1140 | * @fprog: the filter program | |
1141 | * @trans: post-classic verifier transformation handler | |
bab18991 | 1142 | * @save_orig: save classic BPF program |
ac67eb2c DB |
1143 | * |
1144 | * This function effectively does the same as bpf_prog_create(), only | |
1145 | * that it builds up its insns buffer from user space provided buffer. | |
1146 | * It also allows for passing a bpf_aux_classic_check_t handler. | |
1147 | */ | |
1148 | int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, | |
bab18991 | 1149 | bpf_aux_classic_check_t trans, bool save_orig) |
ac67eb2c DB |
1150 | { |
1151 | unsigned int fsize = bpf_classic_proglen(fprog); | |
1152 | struct bpf_prog *fp; | |
bab18991 | 1153 | int err; |
ac67eb2c DB |
1154 | |
1155 | /* Make sure new filter is there and in the right amounts. */ | |
f7bd9e36 | 1156 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
ac67eb2c DB |
1157 | return -EINVAL; |
1158 | ||
1159 | fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); | |
1160 | if (!fp) | |
1161 | return -ENOMEM; | |
1162 | ||
1163 | if (copy_from_user(fp->insns, fprog->filter, fsize)) { | |
1164 | __bpf_prog_free(fp); | |
1165 | return -EFAULT; | |
1166 | } | |
1167 | ||
1168 | fp->len = fprog->len; | |
ac67eb2c DB |
1169 | fp->orig_prog = NULL; |
1170 | ||
bab18991 DB |
1171 | if (save_orig) { |
1172 | err = bpf_prog_store_orig_filter(fp, fprog); | |
1173 | if (err) { | |
1174 | __bpf_prog_free(fp); | |
1175 | return -ENOMEM; | |
1176 | } | |
1177 | } | |
1178 | ||
ac67eb2c DB |
1179 | /* bpf_prepare_filter() already takes care of freeing |
1180 | * memory in case something goes wrong. | |
1181 | */ | |
1182 | fp = bpf_prepare_filter(fp, trans); | |
1183 | if (IS_ERR(fp)) | |
1184 | return PTR_ERR(fp); | |
1185 | ||
1186 | *pfp = fp; | |
1187 | return 0; | |
1188 | } | |
2ea273d7 | 1189 | EXPORT_SYMBOL_GPL(bpf_prog_create_from_user); |
ac67eb2c | 1190 | |
7ae457c1 | 1191 | void bpf_prog_destroy(struct bpf_prog *fp) |
302d6637 | 1192 | { |
7ae457c1 | 1193 | __bpf_prog_release(fp); |
302d6637 | 1194 | } |
7ae457c1 | 1195 | EXPORT_SYMBOL_GPL(bpf_prog_destroy); |
302d6637 | 1196 | |
8ced425e | 1197 | static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk) |
49b31e57 DB |
1198 | { |
1199 | struct sk_filter *fp, *old_fp; | |
1200 | ||
1201 | fp = kmalloc(sizeof(*fp), GFP_KERNEL); | |
1202 | if (!fp) | |
1203 | return -ENOMEM; | |
1204 | ||
1205 | fp->prog = prog; | |
49b31e57 | 1206 | |
4c355cdf | 1207 | if (!__sk_filter_charge(sk, fp)) { |
49b31e57 DB |
1208 | kfree(fp); |
1209 | return -ENOMEM; | |
1210 | } | |
4c355cdf | 1211 | refcount_set(&fp->refcnt, 1); |
49b31e57 | 1212 | |
8ced425e HFS |
1213 | old_fp = rcu_dereference_protected(sk->sk_filter, |
1214 | lockdep_sock_is_held(sk)); | |
49b31e57 | 1215 | rcu_assign_pointer(sk->sk_filter, fp); |
8ced425e | 1216 | |
49b31e57 DB |
1217 | if (old_fp) |
1218 | sk_filter_uncharge(sk, old_fp); | |
1219 | ||
1220 | return 0; | |
1221 | } | |
1222 | ||
538950a1 CG |
1223 | static int __reuseport_attach_prog(struct bpf_prog *prog, struct sock *sk) |
1224 | { | |
1225 | struct bpf_prog *old_prog; | |
1226 | int err; | |
1227 | ||
1228 | if (bpf_prog_size(prog->len) > sysctl_optmem_max) | |
1229 | return -ENOMEM; | |
1230 | ||
fa463497 | 1231 | if (sk_unhashed(sk) && sk->sk_reuseport) { |
538950a1 CG |
1232 | err = reuseport_alloc(sk); |
1233 | if (err) | |
1234 | return err; | |
1235 | } else if (!rcu_access_pointer(sk->sk_reuseport_cb)) { | |
1236 | /* The socket wasn't bound with SO_REUSEPORT */ | |
1237 | return -EINVAL; | |
1238 | } | |
1239 | ||
1240 | old_prog = reuseport_attach_prog(sk, prog); | |
1241 | if (old_prog) | |
1242 | bpf_prog_destroy(old_prog); | |
1243 | ||
1244 | return 0; | |
1245 | } | |
1246 | ||
1247 | static | |
1248 | struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk) | |
1da177e4 | 1249 | { |
009937e7 | 1250 | unsigned int fsize = bpf_classic_proglen(fprog); |
7ae457c1 | 1251 | struct bpf_prog *prog; |
1da177e4 LT |
1252 | int err; |
1253 | ||
d59577b6 | 1254 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
538950a1 | 1255 | return ERR_PTR(-EPERM); |
d59577b6 | 1256 | |
1da177e4 | 1257 | /* Make sure new filter is there and in the right amounts. */ |
f7bd9e36 | 1258 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
538950a1 | 1259 | return ERR_PTR(-EINVAL); |
1da177e4 | 1260 | |
f7bd9e36 | 1261 | prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
7ae457c1 | 1262 | if (!prog) |
538950a1 | 1263 | return ERR_PTR(-ENOMEM); |
a3ea269b | 1264 | |
7ae457c1 | 1265 | if (copy_from_user(prog->insns, fprog->filter, fsize)) { |
c0d1379a | 1266 | __bpf_prog_free(prog); |
538950a1 | 1267 | return ERR_PTR(-EFAULT); |
1da177e4 LT |
1268 | } |
1269 | ||
7ae457c1 | 1270 | prog->len = fprog->len; |
1da177e4 | 1271 | |
7ae457c1 | 1272 | err = bpf_prog_store_orig_filter(prog, fprog); |
a3ea269b | 1273 | if (err) { |
c0d1379a | 1274 | __bpf_prog_free(prog); |
538950a1 | 1275 | return ERR_PTR(-ENOMEM); |
a3ea269b DB |
1276 | } |
1277 | ||
7ae457c1 | 1278 | /* bpf_prepare_filter() already takes care of freeing |
bd4cf0ed AS |
1279 | * memory in case something goes wrong. |
1280 | */ | |
538950a1 CG |
1281 | return bpf_prepare_filter(prog, NULL); |
1282 | } | |
1283 | ||
1284 | /** | |
1285 | * sk_attach_filter - attach a socket filter | |
1286 | * @fprog: the filter program | |
1287 | * @sk: the socket to use | |
1288 | * | |
1289 | * Attach the user's filter code. We first run some sanity checks on | |
1290 | * it to make sure it does not explode on us later. If an error | |
1291 | * occurs or there is insufficient memory for the filter a negative | |
1292 | * errno code is returned. On success the return is zero. | |
1293 | */ | |
8ced425e | 1294 | int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) |
538950a1 CG |
1295 | { |
1296 | struct bpf_prog *prog = __get_filter(fprog, sk); | |
1297 | int err; | |
1298 | ||
7ae457c1 AS |
1299 | if (IS_ERR(prog)) |
1300 | return PTR_ERR(prog); | |
1301 | ||
8ced425e | 1302 | err = __sk_attach_prog(prog, sk); |
49b31e57 | 1303 | if (err < 0) { |
7ae457c1 | 1304 | __bpf_prog_release(prog); |
49b31e57 | 1305 | return err; |
278571ba AS |
1306 | } |
1307 | ||
d3904b73 | 1308 | return 0; |
1da177e4 | 1309 | } |
8ced425e | 1310 | EXPORT_SYMBOL_GPL(sk_attach_filter); |
1da177e4 | 1311 | |
538950a1 | 1312 | int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk) |
89aa0758 | 1313 | { |
538950a1 | 1314 | struct bpf_prog *prog = __get_filter(fprog, sk); |
49b31e57 | 1315 | int err; |
89aa0758 | 1316 | |
538950a1 CG |
1317 | if (IS_ERR(prog)) |
1318 | return PTR_ERR(prog); | |
1319 | ||
1320 | err = __reuseport_attach_prog(prog, sk); | |
1321 | if (err < 0) { | |
1322 | __bpf_prog_release(prog); | |
1323 | return err; | |
1324 | } | |
1325 | ||
1326 | return 0; | |
1327 | } | |
1328 | ||
1329 | static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk) | |
1330 | { | |
89aa0758 | 1331 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
538950a1 | 1332 | return ERR_PTR(-EPERM); |
89aa0758 | 1333 | |
113214be | 1334 | return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); |
538950a1 CG |
1335 | } |
1336 | ||
1337 | int sk_attach_bpf(u32 ufd, struct sock *sk) | |
1338 | { | |
1339 | struct bpf_prog *prog = __get_bpf(ufd, sk); | |
1340 | int err; | |
1341 | ||
1342 | if (IS_ERR(prog)) | |
1343 | return PTR_ERR(prog); | |
1344 | ||
8ced425e | 1345 | err = __sk_attach_prog(prog, sk); |
49b31e57 | 1346 | if (err < 0) { |
89aa0758 | 1347 | bpf_prog_put(prog); |
49b31e57 | 1348 | return err; |
89aa0758 AS |
1349 | } |
1350 | ||
89aa0758 AS |
1351 | return 0; |
1352 | } | |
1353 | ||
538950a1 CG |
1354 | int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk) |
1355 | { | |
1356 | struct bpf_prog *prog = __get_bpf(ufd, sk); | |
1357 | int err; | |
1358 | ||
1359 | if (IS_ERR(prog)) | |
1360 | return PTR_ERR(prog); | |
1361 | ||
1362 | err = __reuseport_attach_prog(prog, sk); | |
1363 | if (err < 0) { | |
1364 | bpf_prog_put(prog); | |
1365 | return err; | |
1366 | } | |
1367 | ||
1368 | return 0; | |
1369 | } | |
1370 | ||
21cafc1d DB |
1371 | struct bpf_scratchpad { |
1372 | union { | |
1373 | __be32 diff[MAX_BPF_STACK / sizeof(__be32)]; | |
1374 | u8 buff[MAX_BPF_STACK]; | |
1375 | }; | |
1376 | }; | |
1377 | ||
1378 | static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp); | |
91bc4822 | 1379 | |
5293efe6 DB |
1380 | static inline int __bpf_try_make_writable(struct sk_buff *skb, |
1381 | unsigned int write_len) | |
1382 | { | |
1383 | return skb_ensure_writable(skb, write_len); | |
1384 | } | |
1385 | ||
db58ba45 AS |
1386 | static inline int bpf_try_make_writable(struct sk_buff *skb, |
1387 | unsigned int write_len) | |
1388 | { | |
5293efe6 | 1389 | int err = __bpf_try_make_writable(skb, write_len); |
db58ba45 | 1390 | |
0ed661d5 | 1391 | bpf_compute_data_end(skb); |
db58ba45 AS |
1392 | return err; |
1393 | } | |
1394 | ||
36bbef52 DB |
1395 | static int bpf_try_make_head_writable(struct sk_buff *skb) |
1396 | { | |
1397 | return bpf_try_make_writable(skb, skb_headlen(skb)); | |
1398 | } | |
1399 | ||
a2bfe6bf DB |
1400 | static inline void bpf_push_mac_rcsum(struct sk_buff *skb) |
1401 | { | |
1402 | if (skb_at_tc_ingress(skb)) | |
1403 | skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len); | |
1404 | } | |
1405 | ||
8065694e DB |
1406 | static inline void bpf_pull_mac_rcsum(struct sk_buff *skb) |
1407 | { | |
1408 | if (skb_at_tc_ingress(skb)) | |
1409 | skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len); | |
1410 | } | |
1411 | ||
f3694e00 DB |
1412 | BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset, |
1413 | const void *, from, u32, len, u64, flags) | |
608cd71a | 1414 | { |
608cd71a AS |
1415 | void *ptr; |
1416 | ||
8afd54c8 | 1417 | if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH))) |
781c53bc | 1418 | return -EINVAL; |
0ed661d5 | 1419 | if (unlikely(offset > 0xffff)) |
608cd71a | 1420 | return -EFAULT; |
db58ba45 | 1421 | if (unlikely(bpf_try_make_writable(skb, offset + len))) |
608cd71a AS |
1422 | return -EFAULT; |
1423 | ||
0ed661d5 | 1424 | ptr = skb->data + offset; |
781c53bc | 1425 | if (flags & BPF_F_RECOMPUTE_CSUM) |
479ffccc | 1426 | __skb_postpull_rcsum(skb, ptr, len, offset); |
608cd71a AS |
1427 | |
1428 | memcpy(ptr, from, len); | |
1429 | ||
781c53bc | 1430 | if (flags & BPF_F_RECOMPUTE_CSUM) |
479ffccc | 1431 | __skb_postpush_rcsum(skb, ptr, len, offset); |
8afd54c8 DB |
1432 | if (flags & BPF_F_INVALIDATE_HASH) |
1433 | skb_clear_hash(skb); | |
f8ffad69 | 1434 | |
608cd71a AS |
1435 | return 0; |
1436 | } | |
1437 | ||
577c50aa | 1438 | static const struct bpf_func_proto bpf_skb_store_bytes_proto = { |
608cd71a AS |
1439 | .func = bpf_skb_store_bytes, |
1440 | .gpl_only = false, | |
1441 | .ret_type = RET_INTEGER, | |
1442 | .arg1_type = ARG_PTR_TO_CTX, | |
1443 | .arg2_type = ARG_ANYTHING, | |
39f19ebb AS |
1444 | .arg3_type = ARG_PTR_TO_MEM, |
1445 | .arg4_type = ARG_CONST_SIZE, | |
91bc4822 AS |
1446 | .arg5_type = ARG_ANYTHING, |
1447 | }; | |
1448 | ||
f3694e00 DB |
1449 | BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset, |
1450 | void *, to, u32, len) | |
05c74e5e | 1451 | { |
05c74e5e DB |
1452 | void *ptr; |
1453 | ||
0ed661d5 | 1454 | if (unlikely(offset > 0xffff)) |
074f528e | 1455 | goto err_clear; |
05c74e5e DB |
1456 | |
1457 | ptr = skb_header_pointer(skb, offset, len, to); | |
1458 | if (unlikely(!ptr)) | |
074f528e | 1459 | goto err_clear; |
05c74e5e DB |
1460 | if (ptr != to) |
1461 | memcpy(to, ptr, len); | |
1462 | ||
1463 | return 0; | |
074f528e DB |
1464 | err_clear: |
1465 | memset(to, 0, len); | |
1466 | return -EFAULT; | |
05c74e5e DB |
1467 | } |
1468 | ||
577c50aa | 1469 | static const struct bpf_func_proto bpf_skb_load_bytes_proto = { |
05c74e5e DB |
1470 | .func = bpf_skb_load_bytes, |
1471 | .gpl_only = false, | |
1472 | .ret_type = RET_INTEGER, | |
1473 | .arg1_type = ARG_PTR_TO_CTX, | |
1474 | .arg2_type = ARG_ANYTHING, | |
39f19ebb AS |
1475 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, |
1476 | .arg4_type = ARG_CONST_SIZE, | |
05c74e5e DB |
1477 | }; |
1478 | ||
36bbef52 DB |
1479 | BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) |
1480 | { | |
1481 | /* Idea is the following: should the needed direct read/write | |
1482 | * test fail during runtime, we can pull in more data and redo | |
1483 | * again, since implicitly, we invalidate previous checks here. | |
1484 | * | |
1485 | * Or, since we know how much we need to make read/writeable, | |
1486 | * this can be done once at the program beginning for direct | |
1487 | * access case. By this we overcome limitations of only current | |
1488 | * headroom being accessible. | |
1489 | */ | |
1490 | return bpf_try_make_writable(skb, len ? : skb_headlen(skb)); | |
1491 | } | |
1492 | ||
1493 | static const struct bpf_func_proto bpf_skb_pull_data_proto = { | |
1494 | .func = bpf_skb_pull_data, | |
1495 | .gpl_only = false, | |
1496 | .ret_type = RET_INTEGER, | |
1497 | .arg1_type = ARG_PTR_TO_CTX, | |
1498 | .arg2_type = ARG_ANYTHING, | |
1499 | }; | |
1500 | ||
f3694e00 DB |
1501 | BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset, |
1502 | u64, from, u64, to, u64, flags) | |
91bc4822 | 1503 | { |
0ed661d5 | 1504 | __sum16 *ptr; |
91bc4822 | 1505 | |
781c53bc DB |
1506 | if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK))) |
1507 | return -EINVAL; | |
0ed661d5 | 1508 | if (unlikely(offset > 0xffff || offset & 1)) |
91bc4822 | 1509 | return -EFAULT; |
0ed661d5 | 1510 | if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) |
91bc4822 AS |
1511 | return -EFAULT; |
1512 | ||
0ed661d5 | 1513 | ptr = (__sum16 *)(skb->data + offset); |
781c53bc | 1514 | switch (flags & BPF_F_HDR_FIELD_MASK) { |
8050c0f0 DB |
1515 | case 0: |
1516 | if (unlikely(from != 0)) | |
1517 | return -EINVAL; | |
1518 | ||
1519 | csum_replace_by_diff(ptr, to); | |
1520 | break; | |
91bc4822 AS |
1521 | case 2: |
1522 | csum_replace2(ptr, from, to); | |
1523 | break; | |
1524 | case 4: | |
1525 | csum_replace4(ptr, from, to); | |
1526 | break; | |
1527 | default: | |
1528 | return -EINVAL; | |
1529 | } | |
1530 | ||
91bc4822 AS |
1531 | return 0; |
1532 | } | |
1533 | ||
577c50aa | 1534 | static const struct bpf_func_proto bpf_l3_csum_replace_proto = { |
91bc4822 AS |
1535 | .func = bpf_l3_csum_replace, |
1536 | .gpl_only = false, | |
1537 | .ret_type = RET_INTEGER, | |
1538 | .arg1_type = ARG_PTR_TO_CTX, | |
1539 | .arg2_type = ARG_ANYTHING, | |
1540 | .arg3_type = ARG_ANYTHING, | |
1541 | .arg4_type = ARG_ANYTHING, | |
1542 | .arg5_type = ARG_ANYTHING, | |
1543 | }; | |
1544 | ||
f3694e00 DB |
1545 | BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, |
1546 | u64, from, u64, to, u64, flags) | |
91bc4822 | 1547 | { |
781c53bc | 1548 | bool is_pseudo = flags & BPF_F_PSEUDO_HDR; |
2f72959a | 1549 | bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; |
d1b662ad | 1550 | bool do_mforce = flags & BPF_F_MARK_ENFORCE; |
0ed661d5 | 1551 | __sum16 *ptr; |
91bc4822 | 1552 | |
d1b662ad DB |
1553 | if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | |
1554 | BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) | |
781c53bc | 1555 | return -EINVAL; |
0ed661d5 | 1556 | if (unlikely(offset > 0xffff || offset & 1)) |
91bc4822 | 1557 | return -EFAULT; |
0ed661d5 | 1558 | if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) |
91bc4822 AS |
1559 | return -EFAULT; |
1560 | ||
0ed661d5 | 1561 | ptr = (__sum16 *)(skb->data + offset); |
d1b662ad | 1562 | if (is_mmzero && !do_mforce && !*ptr) |
2f72959a | 1563 | return 0; |
91bc4822 | 1564 | |
781c53bc | 1565 | switch (flags & BPF_F_HDR_FIELD_MASK) { |
7d672345 DB |
1566 | case 0: |
1567 | if (unlikely(from != 0)) | |
1568 | return -EINVAL; | |
1569 | ||
1570 | inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo); | |
1571 | break; | |
91bc4822 AS |
1572 | case 2: |
1573 | inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); | |
1574 | break; | |
1575 | case 4: | |
1576 | inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo); | |
1577 | break; | |
1578 | default: | |
1579 | return -EINVAL; | |
1580 | } | |
1581 | ||
2f72959a DB |
1582 | if (is_mmzero && !*ptr) |
1583 | *ptr = CSUM_MANGLED_0; | |
91bc4822 AS |
1584 | return 0; |
1585 | } | |
1586 | ||
577c50aa | 1587 | static const struct bpf_func_proto bpf_l4_csum_replace_proto = { |
91bc4822 AS |
1588 | .func = bpf_l4_csum_replace, |
1589 | .gpl_only = false, | |
1590 | .ret_type = RET_INTEGER, | |
1591 | .arg1_type = ARG_PTR_TO_CTX, | |
1592 | .arg2_type = ARG_ANYTHING, | |
1593 | .arg3_type = ARG_ANYTHING, | |
1594 | .arg4_type = ARG_ANYTHING, | |
1595 | .arg5_type = ARG_ANYTHING, | |
608cd71a AS |
1596 | }; |
1597 | ||
f3694e00 DB |
1598 | BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, |
1599 | __be32 *, to, u32, to_size, __wsum, seed) | |
7d672345 | 1600 | { |
21cafc1d | 1601 | struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp); |
f3694e00 | 1602 | u32 diff_size = from_size + to_size; |
7d672345 DB |
1603 | int i, j = 0; |
1604 | ||
1605 | /* This is quite flexible, some examples: | |
1606 | * | |
1607 | * from_size == 0, to_size > 0, seed := csum --> pushing data | |
1608 | * from_size > 0, to_size == 0, seed := csum --> pulling data | |
1609 | * from_size > 0, to_size > 0, seed := 0 --> diffing data | |
1610 | * | |
1611 | * Even for diffing, from_size and to_size don't need to be equal. | |
1612 | */ | |
1613 | if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) || | |
1614 | diff_size > sizeof(sp->diff))) | |
1615 | return -EINVAL; | |
1616 | ||
1617 | for (i = 0; i < from_size / sizeof(__be32); i++, j++) | |
1618 | sp->diff[j] = ~from[i]; | |
1619 | for (i = 0; i < to_size / sizeof(__be32); i++, j++) | |
1620 | sp->diff[j] = to[i]; | |
1621 | ||
1622 | return csum_partial(sp->diff, diff_size, seed); | |
1623 | } | |
1624 | ||
577c50aa | 1625 | static const struct bpf_func_proto bpf_csum_diff_proto = { |
7d672345 DB |
1626 | .func = bpf_csum_diff, |
1627 | .gpl_only = false, | |
36bbef52 | 1628 | .pkt_access = true, |
7d672345 | 1629 | .ret_type = RET_INTEGER, |
39f19ebb AS |
1630 | .arg1_type = ARG_PTR_TO_MEM, |
1631 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
1632 | .arg3_type = ARG_PTR_TO_MEM, | |
1633 | .arg4_type = ARG_CONST_SIZE_OR_ZERO, | |
7d672345 DB |
1634 | .arg5_type = ARG_ANYTHING, |
1635 | }; | |
1636 | ||
36bbef52 DB |
1637 | BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum) |
1638 | { | |
1639 | /* The interface is to be used in combination with bpf_csum_diff() | |
1640 | * for direct packet writes. csum rotation for alignment as well | |
1641 | * as emulating csum_sub() can be done from the eBPF program. | |
1642 | */ | |
1643 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
1644 | return (skb->csum = csum_add(skb->csum, csum)); | |
1645 | ||
1646 | return -ENOTSUPP; | |
1647 | } | |
1648 | ||
1649 | static const struct bpf_func_proto bpf_csum_update_proto = { | |
1650 | .func = bpf_csum_update, | |
1651 | .gpl_only = false, | |
1652 | .ret_type = RET_INTEGER, | |
1653 | .arg1_type = ARG_PTR_TO_CTX, | |
1654 | .arg2_type = ARG_ANYTHING, | |
1655 | }; | |
1656 | ||
a70b506e DB |
1657 | static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb) |
1658 | { | |
a70b506e DB |
1659 | return dev_forward_skb(dev, skb); |
1660 | } | |
1661 | ||
4e3264d2 MKL |
1662 | static inline int __bpf_rx_skb_no_mac(struct net_device *dev, |
1663 | struct sk_buff *skb) | |
1664 | { | |
1665 | int ret = ____dev_forward_skb(dev, skb); | |
1666 | ||
1667 | if (likely(!ret)) { | |
1668 | skb->dev = dev; | |
1669 | ret = netif_rx(skb); | |
1670 | } | |
1671 | ||
1672 | return ret; | |
1673 | } | |
1674 | ||
a70b506e DB |
1675 | static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb) |
1676 | { | |
1677 | int ret; | |
1678 | ||
1679 | if (unlikely(__this_cpu_read(xmit_recursion) > XMIT_RECURSION_LIMIT)) { | |
1680 | net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); | |
1681 | kfree_skb(skb); | |
1682 | return -ENETDOWN; | |
1683 | } | |
1684 | ||
1685 | skb->dev = dev; | |
1686 | ||
1687 | __this_cpu_inc(xmit_recursion); | |
1688 | ret = dev_queue_xmit(skb); | |
1689 | __this_cpu_dec(xmit_recursion); | |
1690 | ||
1691 | return ret; | |
1692 | } | |
1693 | ||
4e3264d2 MKL |
1694 | static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, |
1695 | u32 flags) | |
1696 | { | |
1697 | /* skb->mac_len is not set on normal egress */ | |
1698 | unsigned int mlen = skb->network_header - skb->mac_header; | |
1699 | ||
1700 | __skb_pull(skb, mlen); | |
1701 | ||
1702 | /* At ingress, the mac header has already been pulled once. | |
1703 | * At egress, skb_pospull_rcsum has to be done in case that | |
1704 | * the skb is originated from ingress (i.e. a forwarded skb) | |
1705 | * to ensure that rcsum starts at net header. | |
1706 | */ | |
1707 | if (!skb_at_tc_ingress(skb)) | |
1708 | skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); | |
1709 | skb_pop_mac_header(skb); | |
1710 | skb_reset_mac_len(skb); | |
1711 | return flags & BPF_F_INGRESS ? | |
1712 | __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); | |
1713 | } | |
1714 | ||
1715 | static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, | |
1716 | u32 flags) | |
1717 | { | |
3a0af8fd TG |
1718 | /* Verify that a link layer header is carried */ |
1719 | if (unlikely(skb->mac_header >= skb->network_header)) { | |
1720 | kfree_skb(skb); | |
1721 | return -ERANGE; | |
1722 | } | |
1723 | ||
4e3264d2 MKL |
1724 | bpf_push_mac_rcsum(skb); |
1725 | return flags & BPF_F_INGRESS ? | |
1726 | __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); | |
1727 | } | |
1728 | ||
1729 | static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, | |
1730 | u32 flags) | |
1731 | { | |
c491680f | 1732 | if (dev_is_mac_header_xmit(dev)) |
4e3264d2 | 1733 | return __bpf_redirect_common(skb, dev, flags); |
c491680f DB |
1734 | else |
1735 | return __bpf_redirect_no_mac(skb, dev, flags); | |
4e3264d2 MKL |
1736 | } |
1737 | ||
f3694e00 | 1738 | BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) |
3896d655 | 1739 | { |
3896d655 | 1740 | struct net_device *dev; |
36bbef52 DB |
1741 | struct sk_buff *clone; |
1742 | int ret; | |
3896d655 | 1743 | |
781c53bc DB |
1744 | if (unlikely(flags & ~(BPF_F_INGRESS))) |
1745 | return -EINVAL; | |
1746 | ||
3896d655 AS |
1747 | dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); |
1748 | if (unlikely(!dev)) | |
1749 | return -EINVAL; | |
1750 | ||
36bbef52 DB |
1751 | clone = skb_clone(skb, GFP_ATOMIC); |
1752 | if (unlikely(!clone)) | |
3896d655 AS |
1753 | return -ENOMEM; |
1754 | ||
36bbef52 DB |
1755 | /* For direct write, we need to keep the invariant that the skbs |
1756 | * we're dealing with need to be uncloned. Should uncloning fail | |
1757 | * here, we need to free the just generated clone to unclone once | |
1758 | * again. | |
1759 | */ | |
1760 | ret = bpf_try_make_head_writable(skb); | |
1761 | if (unlikely(ret)) { | |
1762 | kfree_skb(clone); | |
1763 | return -ENOMEM; | |
1764 | } | |
1765 | ||
4e3264d2 | 1766 | return __bpf_redirect(clone, dev, flags); |
3896d655 AS |
1767 | } |
1768 | ||
577c50aa | 1769 | static const struct bpf_func_proto bpf_clone_redirect_proto = { |
3896d655 AS |
1770 | .func = bpf_clone_redirect, |
1771 | .gpl_only = false, | |
1772 | .ret_type = RET_INTEGER, | |
1773 | .arg1_type = ARG_PTR_TO_CTX, | |
1774 | .arg2_type = ARG_ANYTHING, | |
1775 | .arg3_type = ARG_ANYTHING, | |
1776 | }; | |
1777 | ||
27b29f63 AS |
1778 | struct redirect_info { |
1779 | u32 ifindex; | |
1780 | u32 flags; | |
1781 | }; | |
1782 | ||
1783 | static DEFINE_PER_CPU(struct redirect_info, redirect_info); | |
781c53bc | 1784 | |
f3694e00 | 1785 | BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) |
27b29f63 AS |
1786 | { |
1787 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
1788 | ||
781c53bc DB |
1789 | if (unlikely(flags & ~(BPF_F_INGRESS))) |
1790 | return TC_ACT_SHOT; | |
1791 | ||
27b29f63 AS |
1792 | ri->ifindex = ifindex; |
1793 | ri->flags = flags; | |
781c53bc | 1794 | |
27b29f63 AS |
1795 | return TC_ACT_REDIRECT; |
1796 | } | |
1797 | ||
1798 | int skb_do_redirect(struct sk_buff *skb) | |
1799 | { | |
1800 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
1801 | struct net_device *dev; | |
1802 | ||
1803 | dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->ifindex); | |
1804 | ri->ifindex = 0; | |
1805 | if (unlikely(!dev)) { | |
1806 | kfree_skb(skb); | |
1807 | return -EINVAL; | |
1808 | } | |
1809 | ||
4e3264d2 | 1810 | return __bpf_redirect(skb, dev, ri->flags); |
27b29f63 AS |
1811 | } |
1812 | ||
577c50aa | 1813 | static const struct bpf_func_proto bpf_redirect_proto = { |
27b29f63 AS |
1814 | .func = bpf_redirect, |
1815 | .gpl_only = false, | |
1816 | .ret_type = RET_INTEGER, | |
1817 | .arg1_type = ARG_ANYTHING, | |
1818 | .arg2_type = ARG_ANYTHING, | |
1819 | }; | |
1820 | ||
f3694e00 | 1821 | BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) |
8d20aabe | 1822 | { |
f3694e00 | 1823 | return task_get_classid(skb); |
8d20aabe DB |
1824 | } |
1825 | ||
1826 | static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { | |
1827 | .func = bpf_get_cgroup_classid, | |
1828 | .gpl_only = false, | |
1829 | .ret_type = RET_INTEGER, | |
1830 | .arg1_type = ARG_PTR_TO_CTX, | |
1831 | }; | |
1832 | ||
f3694e00 | 1833 | BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) |
c46646d0 | 1834 | { |
f3694e00 | 1835 | return dst_tclassid(skb); |
c46646d0 DB |
1836 | } |
1837 | ||
1838 | static const struct bpf_func_proto bpf_get_route_realm_proto = { | |
1839 | .func = bpf_get_route_realm, | |
1840 | .gpl_only = false, | |
1841 | .ret_type = RET_INTEGER, | |
1842 | .arg1_type = ARG_PTR_TO_CTX, | |
1843 | }; | |
1844 | ||
f3694e00 | 1845 | BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) |
13c5c240 DB |
1846 | { |
1847 | /* If skb_clear_hash() was called due to mangling, we can | |
1848 | * trigger SW recalculation here. Later access to hash | |
1849 | * can then use the inline skb->hash via context directly | |
1850 | * instead of calling this helper again. | |
1851 | */ | |
f3694e00 | 1852 | return skb_get_hash(skb); |
13c5c240 DB |
1853 | } |
1854 | ||
1855 | static const struct bpf_func_proto bpf_get_hash_recalc_proto = { | |
1856 | .func = bpf_get_hash_recalc, | |
1857 | .gpl_only = false, | |
1858 | .ret_type = RET_INTEGER, | |
1859 | .arg1_type = ARG_PTR_TO_CTX, | |
1860 | }; | |
1861 | ||
7a4b28c6 DB |
1862 | BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) |
1863 | { | |
1864 | /* After all direct packet write, this can be used once for | |
1865 | * triggering a lazy recalc on next skb_get_hash() invocation. | |
1866 | */ | |
1867 | skb_clear_hash(skb); | |
1868 | return 0; | |
1869 | } | |
1870 | ||
1871 | static const struct bpf_func_proto bpf_set_hash_invalid_proto = { | |
1872 | .func = bpf_set_hash_invalid, | |
1873 | .gpl_only = false, | |
1874 | .ret_type = RET_INTEGER, | |
1875 | .arg1_type = ARG_PTR_TO_CTX, | |
1876 | }; | |
1877 | ||
ded092cd DB |
1878 | BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) |
1879 | { | |
1880 | /* Set user specified hash as L4(+), so that it gets returned | |
1881 | * on skb_get_hash() call unless BPF prog later on triggers a | |
1882 | * skb_clear_hash(). | |
1883 | */ | |
1884 | __skb_set_sw_hash(skb, hash, true); | |
1885 | return 0; | |
1886 | } | |
1887 | ||
1888 | static const struct bpf_func_proto bpf_set_hash_proto = { | |
1889 | .func = bpf_set_hash, | |
1890 | .gpl_only = false, | |
1891 | .ret_type = RET_INTEGER, | |
1892 | .arg1_type = ARG_PTR_TO_CTX, | |
1893 | .arg2_type = ARG_ANYTHING, | |
1894 | }; | |
1895 | ||
f3694e00 DB |
1896 | BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, |
1897 | u16, vlan_tci) | |
4e10df9a | 1898 | { |
db58ba45 | 1899 | int ret; |
4e10df9a AS |
1900 | |
1901 | if (unlikely(vlan_proto != htons(ETH_P_8021Q) && | |
1902 | vlan_proto != htons(ETH_P_8021AD))) | |
1903 | vlan_proto = htons(ETH_P_8021Q); | |
1904 | ||
8065694e | 1905 | bpf_push_mac_rcsum(skb); |
db58ba45 | 1906 | ret = skb_vlan_push(skb, vlan_proto, vlan_tci); |
8065694e DB |
1907 | bpf_pull_mac_rcsum(skb); |
1908 | ||
db58ba45 AS |
1909 | bpf_compute_data_end(skb); |
1910 | return ret; | |
4e10df9a AS |
1911 | } |
1912 | ||
1913 | const struct bpf_func_proto bpf_skb_vlan_push_proto = { | |
1914 | .func = bpf_skb_vlan_push, | |
1915 | .gpl_only = false, | |
1916 | .ret_type = RET_INTEGER, | |
1917 | .arg1_type = ARG_PTR_TO_CTX, | |
1918 | .arg2_type = ARG_ANYTHING, | |
1919 | .arg3_type = ARG_ANYTHING, | |
1920 | }; | |
4d9c5c53 | 1921 | EXPORT_SYMBOL_GPL(bpf_skb_vlan_push_proto); |
4e10df9a | 1922 | |
f3694e00 | 1923 | BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) |
4e10df9a | 1924 | { |
db58ba45 | 1925 | int ret; |
4e10df9a | 1926 | |
8065694e | 1927 | bpf_push_mac_rcsum(skb); |
db58ba45 | 1928 | ret = skb_vlan_pop(skb); |
8065694e DB |
1929 | bpf_pull_mac_rcsum(skb); |
1930 | ||
db58ba45 AS |
1931 | bpf_compute_data_end(skb); |
1932 | return ret; | |
4e10df9a AS |
1933 | } |
1934 | ||
1935 | const struct bpf_func_proto bpf_skb_vlan_pop_proto = { | |
1936 | .func = bpf_skb_vlan_pop, | |
1937 | .gpl_only = false, | |
1938 | .ret_type = RET_INTEGER, | |
1939 | .arg1_type = ARG_PTR_TO_CTX, | |
1940 | }; | |
4d9c5c53 | 1941 | EXPORT_SYMBOL_GPL(bpf_skb_vlan_pop_proto); |
4e10df9a | 1942 | |
6578171a DB |
1943 | static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) |
1944 | { | |
1945 | /* Caller already did skb_cow() with len as headroom, | |
1946 | * so no need to do it here. | |
1947 | */ | |
1948 | skb_push(skb, len); | |
1949 | memmove(skb->data, skb->data + len, off); | |
1950 | memset(skb->data + off, 0, len); | |
1951 | ||
1952 | /* No skb_postpush_rcsum(skb, skb->data + off, len) | |
1953 | * needed here as it does not change the skb->csum | |
1954 | * result for checksum complete when summing over | |
1955 | * zeroed blocks. | |
1956 | */ | |
1957 | return 0; | |
1958 | } | |
1959 | ||
1960 | static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) | |
1961 | { | |
1962 | /* skb_ensure_writable() is not needed here, as we're | |
1963 | * already working on an uncloned skb. | |
1964 | */ | |
1965 | if (unlikely(!pskb_may_pull(skb, off + len))) | |
1966 | return -ENOMEM; | |
1967 | ||
1968 | skb_postpull_rcsum(skb, skb->data + off, len); | |
1969 | memmove(skb->data + len, skb->data, off); | |
1970 | __skb_pull(skb, len); | |
1971 | ||
1972 | return 0; | |
1973 | } | |
1974 | ||
1975 | static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) | |
1976 | { | |
1977 | bool trans_same = skb->transport_header == skb->network_header; | |
1978 | int ret; | |
1979 | ||
1980 | /* There's no need for __skb_push()/__skb_pull() pair to | |
1981 | * get to the start of the mac header as we're guaranteed | |
1982 | * to always start from here under eBPF. | |
1983 | */ | |
1984 | ret = bpf_skb_generic_push(skb, off, len); | |
1985 | if (likely(!ret)) { | |
1986 | skb->mac_header -= len; | |
1987 | skb->network_header -= len; | |
1988 | if (trans_same) | |
1989 | skb->transport_header = skb->network_header; | |
1990 | } | |
1991 | ||
1992 | return ret; | |
1993 | } | |
1994 | ||
1995 | static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) | |
1996 | { | |
1997 | bool trans_same = skb->transport_header == skb->network_header; | |
1998 | int ret; | |
1999 | ||
2000 | /* Same here, __skb_push()/__skb_pull() pair not needed. */ | |
2001 | ret = bpf_skb_generic_pop(skb, off, len); | |
2002 | if (likely(!ret)) { | |
2003 | skb->mac_header += len; | |
2004 | skb->network_header += len; | |
2005 | if (trans_same) | |
2006 | skb->transport_header = skb->network_header; | |
2007 | } | |
2008 | ||
2009 | return ret; | |
2010 | } | |
2011 | ||
2012 | static int bpf_skb_proto_4_to_6(struct sk_buff *skb) | |
2013 | { | |
2014 | const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); | |
0daf4349 | 2015 | u32 off = skb_mac_header_len(skb); |
6578171a DB |
2016 | int ret; |
2017 | ||
2018 | ret = skb_cow(skb, len_diff); | |
2019 | if (unlikely(ret < 0)) | |
2020 | return ret; | |
2021 | ||
2022 | ret = bpf_skb_net_hdr_push(skb, off, len_diff); | |
2023 | if (unlikely(ret < 0)) | |
2024 | return ret; | |
2025 | ||
2026 | if (skb_is_gso(skb)) { | |
2027 | /* SKB_GSO_UDP stays as is. SKB_GSO_TCPV4 needs to | |
2028 | * be changed into SKB_GSO_TCPV6. | |
2029 | */ | |
2030 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) { | |
2031 | skb_shinfo(skb)->gso_type &= ~SKB_GSO_TCPV4; | |
2032 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6; | |
2033 | } | |
2034 | ||
2035 | /* Due to IPv6 header, MSS needs to be downgraded. */ | |
2036 | skb_shinfo(skb)->gso_size -= len_diff; | |
2037 | /* Header must be checked, and gso_segs recomputed. */ | |
2038 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2039 | skb_shinfo(skb)->gso_segs = 0; | |
2040 | } | |
2041 | ||
2042 | skb->protocol = htons(ETH_P_IPV6); | |
2043 | skb_clear_hash(skb); | |
2044 | ||
2045 | return 0; | |
2046 | } | |
2047 | ||
2048 | static int bpf_skb_proto_6_to_4(struct sk_buff *skb) | |
2049 | { | |
2050 | const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); | |
0daf4349 | 2051 | u32 off = skb_mac_header_len(skb); |
6578171a DB |
2052 | int ret; |
2053 | ||
2054 | ret = skb_unclone(skb, GFP_ATOMIC); | |
2055 | if (unlikely(ret < 0)) | |
2056 | return ret; | |
2057 | ||
2058 | ret = bpf_skb_net_hdr_pop(skb, off, len_diff); | |
2059 | if (unlikely(ret < 0)) | |
2060 | return ret; | |
2061 | ||
2062 | if (skb_is_gso(skb)) { | |
2063 | /* SKB_GSO_UDP stays as is. SKB_GSO_TCPV6 needs to | |
2064 | * be changed into SKB_GSO_TCPV4. | |
2065 | */ | |
2066 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) { | |
2067 | skb_shinfo(skb)->gso_type &= ~SKB_GSO_TCPV6; | |
2068 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4; | |
2069 | } | |
2070 | ||
2071 | /* Due to IPv4 header, MSS can be upgraded. */ | |
2072 | skb_shinfo(skb)->gso_size += len_diff; | |
2073 | /* Header must be checked, and gso_segs recomputed. */ | |
2074 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2075 | skb_shinfo(skb)->gso_segs = 0; | |
2076 | } | |
2077 | ||
2078 | skb->protocol = htons(ETH_P_IP); | |
2079 | skb_clear_hash(skb); | |
2080 | ||
2081 | return 0; | |
2082 | } | |
2083 | ||
2084 | static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) | |
2085 | { | |
2086 | __be16 from_proto = skb->protocol; | |
2087 | ||
2088 | if (from_proto == htons(ETH_P_IP) && | |
2089 | to_proto == htons(ETH_P_IPV6)) | |
2090 | return bpf_skb_proto_4_to_6(skb); | |
2091 | ||
2092 | if (from_proto == htons(ETH_P_IPV6) && | |
2093 | to_proto == htons(ETH_P_IP)) | |
2094 | return bpf_skb_proto_6_to_4(skb); | |
2095 | ||
2096 | return -ENOTSUPP; | |
2097 | } | |
2098 | ||
f3694e00 DB |
2099 | BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, |
2100 | u64, flags) | |
6578171a | 2101 | { |
6578171a DB |
2102 | int ret; |
2103 | ||
2104 | if (unlikely(flags)) | |
2105 | return -EINVAL; | |
2106 | ||
2107 | /* General idea is that this helper does the basic groundwork | |
2108 | * needed for changing the protocol, and eBPF program fills the | |
2109 | * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() | |
2110 | * and other helpers, rather than passing a raw buffer here. | |
2111 | * | |
2112 | * The rationale is to keep this minimal and without a need to | |
2113 | * deal with raw packet data. F.e. even if we would pass buffers | |
2114 | * here, the program still needs to call the bpf_lX_csum_replace() | |
2115 | * helpers anyway. Plus, this way we keep also separation of | |
2116 | * concerns, since f.e. bpf_skb_store_bytes() should only take | |
2117 | * care of stores. | |
2118 | * | |
2119 | * Currently, additional options and extension header space are | |
2120 | * not supported, but flags register is reserved so we can adapt | |
2121 | * that. For offloads, we mark packet as dodgy, so that headers | |
2122 | * need to be verified first. | |
2123 | */ | |
2124 | ret = bpf_skb_proto_xlat(skb, proto); | |
2125 | bpf_compute_data_end(skb); | |
2126 | return ret; | |
2127 | } | |
2128 | ||
2129 | static const struct bpf_func_proto bpf_skb_change_proto_proto = { | |
2130 | .func = bpf_skb_change_proto, | |
2131 | .gpl_only = false, | |
2132 | .ret_type = RET_INTEGER, | |
2133 | .arg1_type = ARG_PTR_TO_CTX, | |
2134 | .arg2_type = ARG_ANYTHING, | |
2135 | .arg3_type = ARG_ANYTHING, | |
2136 | }; | |
2137 | ||
f3694e00 | 2138 | BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) |
d2485c42 | 2139 | { |
d2485c42 | 2140 | /* We only allow a restricted subset to be changed for now. */ |
45c7fffa DB |
2141 | if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || |
2142 | !skb_pkt_type_ok(pkt_type))) | |
d2485c42 DB |
2143 | return -EINVAL; |
2144 | ||
2145 | skb->pkt_type = pkt_type; | |
2146 | return 0; | |
2147 | } | |
2148 | ||
2149 | static const struct bpf_func_proto bpf_skb_change_type_proto = { | |
2150 | .func = bpf_skb_change_type, | |
2151 | .gpl_only = false, | |
2152 | .ret_type = RET_INTEGER, | |
2153 | .arg1_type = ARG_PTR_TO_CTX, | |
2154 | .arg2_type = ARG_ANYTHING, | |
2155 | }; | |
2156 | ||
2be7e212 DB |
2157 | static u32 bpf_skb_net_base_len(const struct sk_buff *skb) |
2158 | { | |
2159 | switch (skb->protocol) { | |
2160 | case htons(ETH_P_IP): | |
2161 | return sizeof(struct iphdr); | |
2162 | case htons(ETH_P_IPV6): | |
2163 | return sizeof(struct ipv6hdr); | |
2164 | default: | |
2165 | return ~0U; | |
2166 | } | |
2167 | } | |
2168 | ||
2169 | static int bpf_skb_net_grow(struct sk_buff *skb, u32 len_diff) | |
2170 | { | |
2171 | u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb); | |
2172 | int ret; | |
2173 | ||
2174 | ret = skb_cow(skb, len_diff); | |
2175 | if (unlikely(ret < 0)) | |
2176 | return ret; | |
2177 | ||
2178 | ret = bpf_skb_net_hdr_push(skb, off, len_diff); | |
2179 | if (unlikely(ret < 0)) | |
2180 | return ret; | |
2181 | ||
2182 | if (skb_is_gso(skb)) { | |
2183 | /* Due to header grow, MSS needs to be downgraded. */ | |
2184 | skb_shinfo(skb)->gso_size -= len_diff; | |
2185 | /* Header must be checked, and gso_segs recomputed. */ | |
2186 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2187 | skb_shinfo(skb)->gso_segs = 0; | |
2188 | } | |
2189 | ||
2190 | return 0; | |
2191 | } | |
2192 | ||
2193 | static int bpf_skb_net_shrink(struct sk_buff *skb, u32 len_diff) | |
2194 | { | |
2195 | u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb); | |
2196 | int ret; | |
2197 | ||
2198 | ret = skb_unclone(skb, GFP_ATOMIC); | |
2199 | if (unlikely(ret < 0)) | |
2200 | return ret; | |
2201 | ||
2202 | ret = bpf_skb_net_hdr_pop(skb, off, len_diff); | |
2203 | if (unlikely(ret < 0)) | |
2204 | return ret; | |
2205 | ||
2206 | if (skb_is_gso(skb)) { | |
2207 | /* Due to header shrink, MSS can be upgraded. */ | |
2208 | skb_shinfo(skb)->gso_size += len_diff; | |
2209 | /* Header must be checked, and gso_segs recomputed. */ | |
2210 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2211 | skb_shinfo(skb)->gso_segs = 0; | |
2212 | } | |
2213 | ||
2214 | return 0; | |
2215 | } | |
2216 | ||
2217 | static u32 __bpf_skb_max_len(const struct sk_buff *skb) | |
2218 | { | |
2219 | return skb->dev->mtu + skb->dev->hard_header_len; | |
2220 | } | |
2221 | ||
2222 | static int bpf_skb_adjust_net(struct sk_buff *skb, s32 len_diff) | |
2223 | { | |
2224 | bool trans_same = skb->transport_header == skb->network_header; | |
2225 | u32 len_cur, len_diff_abs = abs(len_diff); | |
2226 | u32 len_min = bpf_skb_net_base_len(skb); | |
2227 | u32 len_max = __bpf_skb_max_len(skb); | |
2228 | __be16 proto = skb->protocol; | |
2229 | bool shrink = len_diff < 0; | |
2230 | int ret; | |
2231 | ||
2232 | if (unlikely(len_diff_abs > 0xfffU)) | |
2233 | return -EFAULT; | |
2234 | if (unlikely(proto != htons(ETH_P_IP) && | |
2235 | proto != htons(ETH_P_IPV6))) | |
2236 | return -ENOTSUPP; | |
2237 | ||
2238 | len_cur = skb->len - skb_network_offset(skb); | |
2239 | if (skb_transport_header_was_set(skb) && !trans_same) | |
2240 | len_cur = skb_network_header_len(skb); | |
2241 | if ((shrink && (len_diff_abs >= len_cur || | |
2242 | len_cur - len_diff_abs < len_min)) || | |
2243 | (!shrink && (skb->len + len_diff_abs > len_max && | |
2244 | !skb_is_gso(skb)))) | |
2245 | return -ENOTSUPP; | |
2246 | ||
2247 | ret = shrink ? bpf_skb_net_shrink(skb, len_diff_abs) : | |
2248 | bpf_skb_net_grow(skb, len_diff_abs); | |
2249 | ||
2250 | bpf_compute_data_end(skb); | |
e4a6a342 | 2251 | return ret; |
2be7e212 DB |
2252 | } |
2253 | ||
2254 | BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, | |
2255 | u32, mode, u64, flags) | |
2256 | { | |
2257 | if (unlikely(flags)) | |
2258 | return -EINVAL; | |
2259 | if (likely(mode == BPF_ADJ_ROOM_NET)) | |
2260 | return bpf_skb_adjust_net(skb, len_diff); | |
2261 | ||
2262 | return -ENOTSUPP; | |
2263 | } | |
2264 | ||
2265 | static const struct bpf_func_proto bpf_skb_adjust_room_proto = { | |
2266 | .func = bpf_skb_adjust_room, | |
2267 | .gpl_only = false, | |
2268 | .ret_type = RET_INTEGER, | |
2269 | .arg1_type = ARG_PTR_TO_CTX, | |
2270 | .arg2_type = ARG_ANYTHING, | |
2271 | .arg3_type = ARG_ANYTHING, | |
2272 | .arg4_type = ARG_ANYTHING, | |
2273 | }; | |
2274 | ||
5293efe6 DB |
2275 | static u32 __bpf_skb_min_len(const struct sk_buff *skb) |
2276 | { | |
2277 | u32 min_len = skb_network_offset(skb); | |
2278 | ||
2279 | if (skb_transport_header_was_set(skb)) | |
2280 | min_len = skb_transport_offset(skb); | |
2281 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
2282 | min_len = skb_checksum_start_offset(skb) + | |
2283 | skb->csum_offset + sizeof(__sum16); | |
2284 | return min_len; | |
2285 | } | |
2286 | ||
5293efe6 DB |
2287 | static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) |
2288 | { | |
2289 | unsigned int old_len = skb->len; | |
2290 | int ret; | |
2291 | ||
2292 | ret = __skb_grow_rcsum(skb, new_len); | |
2293 | if (!ret) | |
2294 | memset(skb->data + old_len, 0, new_len - old_len); | |
2295 | return ret; | |
2296 | } | |
2297 | ||
2298 | static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) | |
2299 | { | |
2300 | return __skb_trim_rcsum(skb, new_len); | |
2301 | } | |
2302 | ||
f3694e00 DB |
2303 | BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, |
2304 | u64, flags) | |
5293efe6 | 2305 | { |
5293efe6 DB |
2306 | u32 max_len = __bpf_skb_max_len(skb); |
2307 | u32 min_len = __bpf_skb_min_len(skb); | |
5293efe6 DB |
2308 | int ret; |
2309 | ||
2310 | if (unlikely(flags || new_len > max_len || new_len < min_len)) | |
2311 | return -EINVAL; | |
2312 | if (skb->encapsulation) | |
2313 | return -ENOTSUPP; | |
2314 | ||
2315 | /* The basic idea of this helper is that it's performing the | |
2316 | * needed work to either grow or trim an skb, and eBPF program | |
2317 | * rewrites the rest via helpers like bpf_skb_store_bytes(), | |
2318 | * bpf_lX_csum_replace() and others rather than passing a raw | |
2319 | * buffer here. This one is a slow path helper and intended | |
2320 | * for replies with control messages. | |
2321 | * | |
2322 | * Like in bpf_skb_change_proto(), we want to keep this rather | |
2323 | * minimal and without protocol specifics so that we are able | |
2324 | * to separate concerns as in bpf_skb_store_bytes() should only | |
2325 | * be the one responsible for writing buffers. | |
2326 | * | |
2327 | * It's really expected to be a slow path operation here for | |
2328 | * control message replies, so we're implicitly linearizing, | |
2329 | * uncloning and drop offloads from the skb by this. | |
2330 | */ | |
2331 | ret = __bpf_try_make_writable(skb, skb->len); | |
2332 | if (!ret) { | |
2333 | if (new_len > skb->len) | |
2334 | ret = bpf_skb_grow_rcsum(skb, new_len); | |
2335 | else if (new_len < skb->len) | |
2336 | ret = bpf_skb_trim_rcsum(skb, new_len); | |
2337 | if (!ret && skb_is_gso(skb)) | |
2338 | skb_gso_reset(skb); | |
2339 | } | |
2340 | ||
2341 | bpf_compute_data_end(skb); | |
2342 | return ret; | |
2343 | } | |
2344 | ||
2345 | static const struct bpf_func_proto bpf_skb_change_tail_proto = { | |
2346 | .func = bpf_skb_change_tail, | |
2347 | .gpl_only = false, | |
2348 | .ret_type = RET_INTEGER, | |
2349 | .arg1_type = ARG_PTR_TO_CTX, | |
2350 | .arg2_type = ARG_ANYTHING, | |
2351 | .arg3_type = ARG_ANYTHING, | |
2352 | }; | |
2353 | ||
3a0af8fd TG |
2354 | BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, |
2355 | u64, flags) | |
2356 | { | |
2357 | u32 max_len = __bpf_skb_max_len(skb); | |
2358 | u32 new_len = skb->len + head_room; | |
2359 | int ret; | |
2360 | ||
2361 | if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || | |
2362 | new_len < skb->len)) | |
2363 | return -EINVAL; | |
2364 | ||
2365 | ret = skb_cow(skb, head_room); | |
2366 | if (likely(!ret)) { | |
2367 | /* Idea for this helper is that we currently only | |
2368 | * allow to expand on mac header. This means that | |
2369 | * skb->protocol network header, etc, stay as is. | |
2370 | * Compared to bpf_skb_change_tail(), we're more | |
2371 | * flexible due to not needing to linearize or | |
2372 | * reset GSO. Intention for this helper is to be | |
2373 | * used by an L3 skb that needs to push mac header | |
2374 | * for redirection into L2 device. | |
2375 | */ | |
2376 | __skb_push(skb, head_room); | |
2377 | memset(skb->data, 0, head_room); | |
2378 | skb_reset_mac_header(skb); | |
2379 | } | |
2380 | ||
2381 | bpf_compute_data_end(skb); | |
2382 | return 0; | |
2383 | } | |
2384 | ||
2385 | static const struct bpf_func_proto bpf_skb_change_head_proto = { | |
2386 | .func = bpf_skb_change_head, | |
2387 | .gpl_only = false, | |
2388 | .ret_type = RET_INTEGER, | |
2389 | .arg1_type = ARG_PTR_TO_CTX, | |
2390 | .arg2_type = ARG_ANYTHING, | |
2391 | .arg3_type = ARG_ANYTHING, | |
2392 | }; | |
2393 | ||
17bedab2 MKL |
2394 | BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) |
2395 | { | |
2396 | void *data = xdp->data + offset; | |
2397 | ||
2398 | if (unlikely(data < xdp->data_hard_start || | |
2399 | data > xdp->data_end - ETH_HLEN)) | |
2400 | return -EINVAL; | |
2401 | ||
2402 | xdp->data = data; | |
2403 | ||
2404 | return 0; | |
2405 | } | |
2406 | ||
2407 | static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { | |
2408 | .func = bpf_xdp_adjust_head, | |
2409 | .gpl_only = false, | |
2410 | .ret_type = RET_INTEGER, | |
2411 | .arg1_type = ARG_PTR_TO_CTX, | |
2412 | .arg2_type = ARG_ANYTHING, | |
2413 | }; | |
2414 | ||
2415 | bool bpf_helper_changes_pkt_data(void *func) | |
4e10df9a | 2416 | { |
36bbef52 DB |
2417 | if (func == bpf_skb_vlan_push || |
2418 | func == bpf_skb_vlan_pop || | |
2419 | func == bpf_skb_store_bytes || | |
2420 | func == bpf_skb_change_proto || | |
3a0af8fd | 2421 | func == bpf_skb_change_head || |
36bbef52 | 2422 | func == bpf_skb_change_tail || |
2be7e212 | 2423 | func == bpf_skb_adjust_room || |
36bbef52 | 2424 | func == bpf_skb_pull_data || |
41703a73 | 2425 | func == bpf_clone_redirect || |
36bbef52 | 2426 | func == bpf_l3_csum_replace || |
17bedab2 MKL |
2427 | func == bpf_l4_csum_replace || |
2428 | func == bpf_xdp_adjust_head) | |
3697649f DB |
2429 | return true; |
2430 | ||
4e10df9a AS |
2431 | return false; |
2432 | } | |
2433 | ||
555c8a86 | 2434 | static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, |
aa7145c1 | 2435 | unsigned long off, unsigned long len) |
555c8a86 | 2436 | { |
aa7145c1 | 2437 | void *ptr = skb_header_pointer(skb, off, len, dst_buff); |
555c8a86 DB |
2438 | |
2439 | if (unlikely(!ptr)) | |
2440 | return len; | |
2441 | if (ptr != dst_buff) | |
2442 | memcpy(dst_buff, ptr, len); | |
2443 | ||
2444 | return 0; | |
2445 | } | |
2446 | ||
f3694e00 DB |
2447 | BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, |
2448 | u64, flags, void *, meta, u64, meta_size) | |
555c8a86 | 2449 | { |
555c8a86 | 2450 | u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; |
555c8a86 DB |
2451 | |
2452 | if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) | |
2453 | return -EINVAL; | |
2454 | if (unlikely(skb_size > skb->len)) | |
2455 | return -EFAULT; | |
2456 | ||
2457 | return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, | |
2458 | bpf_skb_copy); | |
2459 | } | |
2460 | ||
2461 | static const struct bpf_func_proto bpf_skb_event_output_proto = { | |
2462 | .func = bpf_skb_event_output, | |
2463 | .gpl_only = true, | |
2464 | .ret_type = RET_INTEGER, | |
2465 | .arg1_type = ARG_PTR_TO_CTX, | |
2466 | .arg2_type = ARG_CONST_MAP_PTR, | |
2467 | .arg3_type = ARG_ANYTHING, | |
39f19ebb AS |
2468 | .arg4_type = ARG_PTR_TO_MEM, |
2469 | .arg5_type = ARG_CONST_SIZE, | |
555c8a86 DB |
2470 | }; |
2471 | ||
c6c33454 DB |
2472 | static unsigned short bpf_tunnel_key_af(u64 flags) |
2473 | { | |
2474 | return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; | |
2475 | } | |
2476 | ||
f3694e00 DB |
2477 | BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, |
2478 | u32, size, u64, flags) | |
d3aa45ce | 2479 | { |
c6c33454 DB |
2480 | const struct ip_tunnel_info *info = skb_tunnel_info(skb); |
2481 | u8 compat[sizeof(struct bpf_tunnel_key)]; | |
074f528e DB |
2482 | void *to_orig = to; |
2483 | int err; | |
d3aa45ce | 2484 | |
074f528e DB |
2485 | if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) { |
2486 | err = -EINVAL; | |
2487 | goto err_clear; | |
2488 | } | |
2489 | if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { | |
2490 | err = -EPROTO; | |
2491 | goto err_clear; | |
2492 | } | |
c6c33454 | 2493 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) { |
074f528e | 2494 | err = -EINVAL; |
c6c33454 | 2495 | switch (size) { |
4018ab18 | 2496 | case offsetof(struct bpf_tunnel_key, tunnel_label): |
c0e760c9 | 2497 | case offsetof(struct bpf_tunnel_key, tunnel_ext): |
4018ab18 | 2498 | goto set_compat; |
c6c33454 DB |
2499 | case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): |
2500 | /* Fixup deprecated structure layouts here, so we have | |
2501 | * a common path later on. | |
2502 | */ | |
2503 | if (ip_tunnel_info_af(info) != AF_INET) | |
074f528e | 2504 | goto err_clear; |
4018ab18 | 2505 | set_compat: |
c6c33454 DB |
2506 | to = (struct bpf_tunnel_key *)compat; |
2507 | break; | |
2508 | default: | |
074f528e | 2509 | goto err_clear; |
c6c33454 DB |
2510 | } |
2511 | } | |
d3aa45ce AS |
2512 | |
2513 | to->tunnel_id = be64_to_cpu(info->key.tun_id); | |
c6c33454 DB |
2514 | to->tunnel_tos = info->key.tos; |
2515 | to->tunnel_ttl = info->key.ttl; | |
2516 | ||
4018ab18 | 2517 | if (flags & BPF_F_TUNINFO_IPV6) { |
c6c33454 DB |
2518 | memcpy(to->remote_ipv6, &info->key.u.ipv6.src, |
2519 | sizeof(to->remote_ipv6)); | |
4018ab18 DB |
2520 | to->tunnel_label = be32_to_cpu(info->key.label); |
2521 | } else { | |
c6c33454 | 2522 | to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); |
4018ab18 | 2523 | } |
c6c33454 DB |
2524 | |
2525 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) | |
074f528e | 2526 | memcpy(to_orig, to, size); |
d3aa45ce AS |
2527 | |
2528 | return 0; | |
074f528e DB |
2529 | err_clear: |
2530 | memset(to_orig, 0, size); | |
2531 | return err; | |
d3aa45ce AS |
2532 | } |
2533 | ||
577c50aa | 2534 | static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { |
d3aa45ce AS |
2535 | .func = bpf_skb_get_tunnel_key, |
2536 | .gpl_only = false, | |
2537 | .ret_type = RET_INTEGER, | |
2538 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
2539 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, |
2540 | .arg3_type = ARG_CONST_SIZE, | |
d3aa45ce AS |
2541 | .arg4_type = ARG_ANYTHING, |
2542 | }; | |
2543 | ||
f3694e00 | 2544 | BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) |
14ca0751 | 2545 | { |
14ca0751 | 2546 | const struct ip_tunnel_info *info = skb_tunnel_info(skb); |
074f528e | 2547 | int err; |
14ca0751 DB |
2548 | |
2549 | if (unlikely(!info || | |
074f528e DB |
2550 | !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { |
2551 | err = -ENOENT; | |
2552 | goto err_clear; | |
2553 | } | |
2554 | if (unlikely(size < info->options_len)) { | |
2555 | err = -ENOMEM; | |
2556 | goto err_clear; | |
2557 | } | |
14ca0751 DB |
2558 | |
2559 | ip_tunnel_info_opts_get(to, info); | |
074f528e DB |
2560 | if (size > info->options_len) |
2561 | memset(to + info->options_len, 0, size - info->options_len); | |
14ca0751 DB |
2562 | |
2563 | return info->options_len; | |
074f528e DB |
2564 | err_clear: |
2565 | memset(to, 0, size); | |
2566 | return err; | |
14ca0751 DB |
2567 | } |
2568 | ||
2569 | static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { | |
2570 | .func = bpf_skb_get_tunnel_opt, | |
2571 | .gpl_only = false, | |
2572 | .ret_type = RET_INTEGER, | |
2573 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
2574 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, |
2575 | .arg3_type = ARG_CONST_SIZE, | |
14ca0751 DB |
2576 | }; |
2577 | ||
d3aa45ce AS |
2578 | static struct metadata_dst __percpu *md_dst; |
2579 | ||
f3694e00 DB |
2580 | BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, |
2581 | const struct bpf_tunnel_key *, from, u32, size, u64, flags) | |
d3aa45ce | 2582 | { |
d3aa45ce | 2583 | struct metadata_dst *md = this_cpu_ptr(md_dst); |
c6c33454 | 2584 | u8 compat[sizeof(struct bpf_tunnel_key)]; |
d3aa45ce AS |
2585 | struct ip_tunnel_info *info; |
2586 | ||
22080870 DB |
2587 | if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | |
2588 | BPF_F_DONT_FRAGMENT))) | |
d3aa45ce | 2589 | return -EINVAL; |
c6c33454 DB |
2590 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) { |
2591 | switch (size) { | |
4018ab18 | 2592 | case offsetof(struct bpf_tunnel_key, tunnel_label): |
c0e760c9 | 2593 | case offsetof(struct bpf_tunnel_key, tunnel_ext): |
c6c33454 DB |
2594 | case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): |
2595 | /* Fixup deprecated structure layouts here, so we have | |
2596 | * a common path later on. | |
2597 | */ | |
2598 | memcpy(compat, from, size); | |
2599 | memset(compat + size, 0, sizeof(compat) - size); | |
f3694e00 | 2600 | from = (const struct bpf_tunnel_key *) compat; |
c6c33454 DB |
2601 | break; |
2602 | default: | |
2603 | return -EINVAL; | |
2604 | } | |
2605 | } | |
c0e760c9 DB |
2606 | if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || |
2607 | from->tunnel_ext)) | |
4018ab18 | 2608 | return -EINVAL; |
d3aa45ce AS |
2609 | |
2610 | skb_dst_drop(skb); | |
2611 | dst_hold((struct dst_entry *) md); | |
2612 | skb_dst_set(skb, (struct dst_entry *) md); | |
2613 | ||
2614 | info = &md->u.tun_info; | |
2615 | info->mode = IP_TUNNEL_INFO_TX; | |
c6c33454 | 2616 | |
db3c6139 | 2617 | info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; |
22080870 DB |
2618 | if (flags & BPF_F_DONT_FRAGMENT) |
2619 | info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; | |
2620 | ||
d3aa45ce | 2621 | info->key.tun_id = cpu_to_be64(from->tunnel_id); |
c6c33454 DB |
2622 | info->key.tos = from->tunnel_tos; |
2623 | info->key.ttl = from->tunnel_ttl; | |
2624 | ||
2625 | if (flags & BPF_F_TUNINFO_IPV6) { | |
2626 | info->mode |= IP_TUNNEL_INFO_IPV6; | |
2627 | memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, | |
2628 | sizeof(from->remote_ipv6)); | |
4018ab18 DB |
2629 | info->key.label = cpu_to_be32(from->tunnel_label) & |
2630 | IPV6_FLOWLABEL_MASK; | |
c6c33454 DB |
2631 | } else { |
2632 | info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); | |
2da897e5 DB |
2633 | if (flags & BPF_F_ZERO_CSUM_TX) |
2634 | info->key.tun_flags &= ~TUNNEL_CSUM; | |
c6c33454 | 2635 | } |
d3aa45ce AS |
2636 | |
2637 | return 0; | |
2638 | } | |
2639 | ||
577c50aa | 2640 | static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { |
d3aa45ce AS |
2641 | .func = bpf_skb_set_tunnel_key, |
2642 | .gpl_only = false, | |
2643 | .ret_type = RET_INTEGER, | |
2644 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
2645 | .arg2_type = ARG_PTR_TO_MEM, |
2646 | .arg3_type = ARG_CONST_SIZE, | |
d3aa45ce AS |
2647 | .arg4_type = ARG_ANYTHING, |
2648 | }; | |
2649 | ||
f3694e00 DB |
2650 | BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, |
2651 | const u8 *, from, u32, size) | |
14ca0751 | 2652 | { |
14ca0751 DB |
2653 | struct ip_tunnel_info *info = skb_tunnel_info(skb); |
2654 | const struct metadata_dst *md = this_cpu_ptr(md_dst); | |
2655 | ||
2656 | if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) | |
2657 | return -EINVAL; | |
fca5fdf6 | 2658 | if (unlikely(size > IP_TUNNEL_OPTS_MAX)) |
14ca0751 DB |
2659 | return -ENOMEM; |
2660 | ||
2661 | ip_tunnel_info_opts_set(info, from, size); | |
2662 | ||
2663 | return 0; | |
2664 | } | |
2665 | ||
2666 | static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { | |
2667 | .func = bpf_skb_set_tunnel_opt, | |
2668 | .gpl_only = false, | |
2669 | .ret_type = RET_INTEGER, | |
2670 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
2671 | .arg2_type = ARG_PTR_TO_MEM, |
2672 | .arg3_type = ARG_CONST_SIZE, | |
14ca0751 DB |
2673 | }; |
2674 | ||
2675 | static const struct bpf_func_proto * | |
2676 | bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) | |
d3aa45ce AS |
2677 | { |
2678 | if (!md_dst) { | |
14ca0751 DB |
2679 | /* Race is not possible, since it's called from verifier |
2680 | * that is holding verifier mutex. | |
d3aa45ce | 2681 | */ |
fca5fdf6 | 2682 | md_dst = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, |
3fcece12 | 2683 | METADATA_IP_TUNNEL, |
14ca0751 | 2684 | GFP_KERNEL); |
d3aa45ce AS |
2685 | if (!md_dst) |
2686 | return NULL; | |
2687 | } | |
14ca0751 DB |
2688 | |
2689 | switch (which) { | |
2690 | case BPF_FUNC_skb_set_tunnel_key: | |
2691 | return &bpf_skb_set_tunnel_key_proto; | |
2692 | case BPF_FUNC_skb_set_tunnel_opt: | |
2693 | return &bpf_skb_set_tunnel_opt_proto; | |
2694 | default: | |
2695 | return NULL; | |
2696 | } | |
d3aa45ce AS |
2697 | } |
2698 | ||
f3694e00 DB |
2699 | BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, |
2700 | u32, idx) | |
4a482f34 | 2701 | { |
4a482f34 MKL |
2702 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
2703 | struct cgroup *cgrp; | |
2704 | struct sock *sk; | |
4a482f34 | 2705 | |
2d48c5f9 | 2706 | sk = skb_to_full_sk(skb); |
4a482f34 MKL |
2707 | if (!sk || !sk_fullsock(sk)) |
2708 | return -ENOENT; | |
f3694e00 | 2709 | if (unlikely(idx >= array->map.max_entries)) |
4a482f34 MKL |
2710 | return -E2BIG; |
2711 | ||
f3694e00 | 2712 | cgrp = READ_ONCE(array->ptrs[idx]); |
4a482f34 MKL |
2713 | if (unlikely(!cgrp)) |
2714 | return -EAGAIN; | |
2715 | ||
54fd9c2d | 2716 | return sk_under_cgroup_hierarchy(sk, cgrp); |
4a482f34 MKL |
2717 | } |
2718 | ||
747ea55e DB |
2719 | static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { |
2720 | .func = bpf_skb_under_cgroup, | |
4a482f34 MKL |
2721 | .gpl_only = false, |
2722 | .ret_type = RET_INTEGER, | |
2723 | .arg1_type = ARG_PTR_TO_CTX, | |
2724 | .arg2_type = ARG_CONST_MAP_PTR, | |
2725 | .arg3_type = ARG_ANYTHING, | |
2726 | }; | |
4a482f34 | 2727 | |
4de16969 DB |
2728 | static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff, |
2729 | unsigned long off, unsigned long len) | |
2730 | { | |
2731 | memcpy(dst_buff, src_buff + off, len); | |
2732 | return 0; | |
2733 | } | |
2734 | ||
f3694e00 DB |
2735 | BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, |
2736 | u64, flags, void *, meta, u64, meta_size) | |
4de16969 | 2737 | { |
4de16969 | 2738 | u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; |
4de16969 DB |
2739 | |
2740 | if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) | |
2741 | return -EINVAL; | |
2742 | if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data))) | |
2743 | return -EFAULT; | |
2744 | ||
9c471370 MKL |
2745 | return bpf_event_output(map, flags, meta, meta_size, xdp->data, |
2746 | xdp_size, bpf_xdp_copy); | |
4de16969 DB |
2747 | } |
2748 | ||
2749 | static const struct bpf_func_proto bpf_xdp_event_output_proto = { | |
2750 | .func = bpf_xdp_event_output, | |
2751 | .gpl_only = true, | |
2752 | .ret_type = RET_INTEGER, | |
2753 | .arg1_type = ARG_PTR_TO_CTX, | |
2754 | .arg2_type = ARG_CONST_MAP_PTR, | |
2755 | .arg3_type = ARG_ANYTHING, | |
39f19ebb AS |
2756 | .arg4_type = ARG_PTR_TO_MEM, |
2757 | .arg5_type = ARG_CONST_SIZE, | |
4de16969 DB |
2758 | }; |
2759 | ||
91b8270f CF |
2760 | BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) |
2761 | { | |
2762 | return skb->sk ? sock_gen_cookie(skb->sk) : 0; | |
2763 | } | |
2764 | ||
2765 | static const struct bpf_func_proto bpf_get_socket_cookie_proto = { | |
2766 | .func = bpf_get_socket_cookie, | |
2767 | .gpl_only = false, | |
2768 | .ret_type = RET_INTEGER, | |
2769 | .arg1_type = ARG_PTR_TO_CTX, | |
2770 | }; | |
2771 | ||
6acc5c29 CF |
2772 | BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) |
2773 | { | |
2774 | struct sock *sk = sk_to_full_sk(skb->sk); | |
2775 | kuid_t kuid; | |
2776 | ||
2777 | if (!sk || !sk_fullsock(sk)) | |
2778 | return overflowuid; | |
2779 | kuid = sock_net_uid(sock_net(sk), sk); | |
2780 | return from_kuid_munged(sock_net(sk)->user_ns, kuid); | |
2781 | } | |
2782 | ||
2783 | static const struct bpf_func_proto bpf_get_socket_uid_proto = { | |
2784 | .func = bpf_get_socket_uid, | |
2785 | .gpl_only = false, | |
2786 | .ret_type = RET_INTEGER, | |
2787 | .arg1_type = ARG_PTR_TO_CTX, | |
2788 | }; | |
2789 | ||
8c4b4c7e LB |
2790 | BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, |
2791 | int, level, int, optname, char *, optval, int, optlen) | |
2792 | { | |
2793 | struct sock *sk = bpf_sock->sk; | |
2794 | int ret = 0; | |
2795 | int val; | |
2796 | ||
2797 | if (!sk_fullsock(sk)) | |
2798 | return -EINVAL; | |
2799 | ||
2800 | if (level == SOL_SOCKET) { | |
2801 | if (optlen != sizeof(int)) | |
2802 | return -EINVAL; | |
2803 | val = *((int *)optval); | |
2804 | ||
2805 | /* Only some socketops are supported */ | |
2806 | switch (optname) { | |
2807 | case SO_RCVBUF: | |
2808 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
2809 | sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); | |
2810 | break; | |
2811 | case SO_SNDBUF: | |
2812 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
2813 | sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); | |
2814 | break; | |
2815 | case SO_MAX_PACING_RATE: | |
2816 | sk->sk_max_pacing_rate = val; | |
2817 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, | |
2818 | sk->sk_max_pacing_rate); | |
2819 | break; | |
2820 | case SO_PRIORITY: | |
2821 | sk->sk_priority = val; | |
2822 | break; | |
2823 | case SO_RCVLOWAT: | |
2824 | if (val < 0) | |
2825 | val = INT_MAX; | |
2826 | sk->sk_rcvlowat = val ? : 1; | |
2827 | break; | |
2828 | case SO_MARK: | |
2829 | sk->sk_mark = val; | |
2830 | break; | |
2831 | default: | |
2832 | ret = -EINVAL; | |
2833 | } | |
a5192c52 | 2834 | #ifdef CONFIG_INET |
8c4b4c7e LB |
2835 | } else if (level == SOL_TCP && |
2836 | sk->sk_prot->setsockopt == tcp_setsockopt) { | |
91b5b21c LB |
2837 | if (optname == TCP_CONGESTION) { |
2838 | char name[TCP_CA_NAME_MAX]; | |
2839 | ||
2840 | strncpy(name, optval, min_t(long, optlen, | |
2841 | TCP_CA_NAME_MAX-1)); | |
2842 | name[TCP_CA_NAME_MAX-1] = 0; | |
2843 | ret = tcp_set_congestion_control(sk, name, false); | |
2844 | if (!ret && bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN) | |
2845 | /* replacing an existing ca */ | |
2846 | tcp_reinit_congestion_control(sk, | |
2847 | inet_csk(sk)->icsk_ca_ops); | |
2848 | } else { | |
fc747810 LB |
2849 | struct tcp_sock *tp = tcp_sk(sk); |
2850 | ||
2851 | if (optlen != sizeof(int)) | |
2852 | return -EINVAL; | |
2853 | ||
2854 | val = *((int *)optval); | |
2855 | /* Only some options are supported */ | |
2856 | switch (optname) { | |
2857 | case TCP_BPF_IW: | |
2858 | if (val <= 0 || tp->data_segs_out > 0) | |
2859 | ret = -EINVAL; | |
2860 | else | |
2861 | tp->snd_cwnd = val; | |
2862 | break; | |
13bf9641 LB |
2863 | case TCP_BPF_SNDCWND_CLAMP: |
2864 | if (val <= 0) { | |
2865 | ret = -EINVAL; | |
2866 | } else { | |
2867 | tp->snd_cwnd_clamp = val; | |
2868 | tp->snd_ssthresh = val; | |
2869 | } | |
6d3f06a0 | 2870 | break; |
fc747810 LB |
2871 | default: |
2872 | ret = -EINVAL; | |
2873 | } | |
91b5b21c | 2874 | } |
8c4b4c7e | 2875 | ret = -EINVAL; |
91b5b21c | 2876 | #endif |
8c4b4c7e LB |
2877 | } else { |
2878 | ret = -EINVAL; | |
2879 | } | |
2880 | return ret; | |
2881 | } | |
2882 | ||
2883 | static const struct bpf_func_proto bpf_setsockopt_proto = { | |
2884 | .func = bpf_setsockopt, | |
2885 | .gpl_only = true, | |
2886 | .ret_type = RET_INTEGER, | |
2887 | .arg1_type = ARG_PTR_TO_CTX, | |
2888 | .arg2_type = ARG_ANYTHING, | |
2889 | .arg3_type = ARG_ANYTHING, | |
2890 | .arg4_type = ARG_PTR_TO_MEM, | |
2891 | .arg5_type = ARG_CONST_SIZE, | |
2892 | }; | |
2893 | ||
d4052c4a | 2894 | static const struct bpf_func_proto * |
2492d3b8 | 2895 | bpf_base_func_proto(enum bpf_func_id func_id) |
89aa0758 AS |
2896 | { |
2897 | switch (func_id) { | |
2898 | case BPF_FUNC_map_lookup_elem: | |
2899 | return &bpf_map_lookup_elem_proto; | |
2900 | case BPF_FUNC_map_update_elem: | |
2901 | return &bpf_map_update_elem_proto; | |
2902 | case BPF_FUNC_map_delete_elem: | |
2903 | return &bpf_map_delete_elem_proto; | |
03e69b50 DB |
2904 | case BPF_FUNC_get_prandom_u32: |
2905 | return &bpf_get_prandom_u32_proto; | |
c04167ce | 2906 | case BPF_FUNC_get_smp_processor_id: |
80b48c44 | 2907 | return &bpf_get_raw_smp_processor_id_proto; |
2d0e30c3 DB |
2908 | case BPF_FUNC_get_numa_node_id: |
2909 | return &bpf_get_numa_node_id_proto; | |
04fd61ab AS |
2910 | case BPF_FUNC_tail_call: |
2911 | return &bpf_tail_call_proto; | |
17ca8cbf DB |
2912 | case BPF_FUNC_ktime_get_ns: |
2913 | return &bpf_ktime_get_ns_proto; | |
0756ea3e | 2914 | case BPF_FUNC_trace_printk: |
1be7f75d AS |
2915 | if (capable(CAP_SYS_ADMIN)) |
2916 | return bpf_get_trace_printk_proto(); | |
89aa0758 AS |
2917 | default: |
2918 | return NULL; | |
2919 | } | |
2920 | } | |
2921 | ||
2492d3b8 DB |
2922 | static const struct bpf_func_proto * |
2923 | sk_filter_func_proto(enum bpf_func_id func_id) | |
2924 | { | |
2925 | switch (func_id) { | |
2926 | case BPF_FUNC_skb_load_bytes: | |
2927 | return &bpf_skb_load_bytes_proto; | |
91b8270f CF |
2928 | case BPF_FUNC_get_socket_cookie: |
2929 | return &bpf_get_socket_cookie_proto; | |
6acc5c29 CF |
2930 | case BPF_FUNC_get_socket_uid: |
2931 | return &bpf_get_socket_uid_proto; | |
2492d3b8 DB |
2932 | default: |
2933 | return bpf_base_func_proto(func_id); | |
2934 | } | |
2935 | } | |
2936 | ||
608cd71a AS |
2937 | static const struct bpf_func_proto * |
2938 | tc_cls_act_func_proto(enum bpf_func_id func_id) | |
2939 | { | |
2940 | switch (func_id) { | |
2941 | case BPF_FUNC_skb_store_bytes: | |
2942 | return &bpf_skb_store_bytes_proto; | |
05c74e5e DB |
2943 | case BPF_FUNC_skb_load_bytes: |
2944 | return &bpf_skb_load_bytes_proto; | |
36bbef52 DB |
2945 | case BPF_FUNC_skb_pull_data: |
2946 | return &bpf_skb_pull_data_proto; | |
7d672345 DB |
2947 | case BPF_FUNC_csum_diff: |
2948 | return &bpf_csum_diff_proto; | |
36bbef52 DB |
2949 | case BPF_FUNC_csum_update: |
2950 | return &bpf_csum_update_proto; | |
91bc4822 AS |
2951 | case BPF_FUNC_l3_csum_replace: |
2952 | return &bpf_l3_csum_replace_proto; | |
2953 | case BPF_FUNC_l4_csum_replace: | |
2954 | return &bpf_l4_csum_replace_proto; | |
3896d655 AS |
2955 | case BPF_FUNC_clone_redirect: |
2956 | return &bpf_clone_redirect_proto; | |
8d20aabe DB |
2957 | case BPF_FUNC_get_cgroup_classid: |
2958 | return &bpf_get_cgroup_classid_proto; | |
4e10df9a AS |
2959 | case BPF_FUNC_skb_vlan_push: |
2960 | return &bpf_skb_vlan_push_proto; | |
2961 | case BPF_FUNC_skb_vlan_pop: | |
2962 | return &bpf_skb_vlan_pop_proto; | |
6578171a DB |
2963 | case BPF_FUNC_skb_change_proto: |
2964 | return &bpf_skb_change_proto_proto; | |
d2485c42 DB |
2965 | case BPF_FUNC_skb_change_type: |
2966 | return &bpf_skb_change_type_proto; | |
2be7e212 DB |
2967 | case BPF_FUNC_skb_adjust_room: |
2968 | return &bpf_skb_adjust_room_proto; | |
5293efe6 DB |
2969 | case BPF_FUNC_skb_change_tail: |
2970 | return &bpf_skb_change_tail_proto; | |
d3aa45ce AS |
2971 | case BPF_FUNC_skb_get_tunnel_key: |
2972 | return &bpf_skb_get_tunnel_key_proto; | |
2973 | case BPF_FUNC_skb_set_tunnel_key: | |
14ca0751 DB |
2974 | return bpf_get_skb_set_tunnel_proto(func_id); |
2975 | case BPF_FUNC_skb_get_tunnel_opt: | |
2976 | return &bpf_skb_get_tunnel_opt_proto; | |
2977 | case BPF_FUNC_skb_set_tunnel_opt: | |
2978 | return bpf_get_skb_set_tunnel_proto(func_id); | |
27b29f63 AS |
2979 | case BPF_FUNC_redirect: |
2980 | return &bpf_redirect_proto; | |
c46646d0 DB |
2981 | case BPF_FUNC_get_route_realm: |
2982 | return &bpf_get_route_realm_proto; | |
13c5c240 DB |
2983 | case BPF_FUNC_get_hash_recalc: |
2984 | return &bpf_get_hash_recalc_proto; | |
7a4b28c6 DB |
2985 | case BPF_FUNC_set_hash_invalid: |
2986 | return &bpf_set_hash_invalid_proto; | |
ded092cd DB |
2987 | case BPF_FUNC_set_hash: |
2988 | return &bpf_set_hash_proto; | |
bd570ff9 | 2989 | case BPF_FUNC_perf_event_output: |
555c8a86 | 2990 | return &bpf_skb_event_output_proto; |
80b48c44 DB |
2991 | case BPF_FUNC_get_smp_processor_id: |
2992 | return &bpf_get_smp_processor_id_proto; | |
747ea55e DB |
2993 | case BPF_FUNC_skb_under_cgroup: |
2994 | return &bpf_skb_under_cgroup_proto; | |
91b8270f CF |
2995 | case BPF_FUNC_get_socket_cookie: |
2996 | return &bpf_get_socket_cookie_proto; | |
6acc5c29 CF |
2997 | case BPF_FUNC_get_socket_uid: |
2998 | return &bpf_get_socket_uid_proto; | |
608cd71a | 2999 | default: |
2492d3b8 | 3000 | return bpf_base_func_proto(func_id); |
608cd71a AS |
3001 | } |
3002 | } | |
3003 | ||
6a773a15 BB |
3004 | static const struct bpf_func_proto * |
3005 | xdp_func_proto(enum bpf_func_id func_id) | |
3006 | { | |
4de16969 DB |
3007 | switch (func_id) { |
3008 | case BPF_FUNC_perf_event_output: | |
3009 | return &bpf_xdp_event_output_proto; | |
669dc4d7 DB |
3010 | case BPF_FUNC_get_smp_processor_id: |
3011 | return &bpf_get_smp_processor_id_proto; | |
17bedab2 MKL |
3012 | case BPF_FUNC_xdp_adjust_head: |
3013 | return &bpf_xdp_adjust_head_proto; | |
4de16969 | 3014 | default: |
2492d3b8 | 3015 | return bpf_base_func_proto(func_id); |
4de16969 | 3016 | } |
6a773a15 BB |
3017 | } |
3018 | ||
3a0af8fd TG |
3019 | static const struct bpf_func_proto * |
3020 | lwt_inout_func_proto(enum bpf_func_id func_id) | |
3021 | { | |
3022 | switch (func_id) { | |
3023 | case BPF_FUNC_skb_load_bytes: | |
3024 | return &bpf_skb_load_bytes_proto; | |
3025 | case BPF_FUNC_skb_pull_data: | |
3026 | return &bpf_skb_pull_data_proto; | |
3027 | case BPF_FUNC_csum_diff: | |
3028 | return &bpf_csum_diff_proto; | |
3029 | case BPF_FUNC_get_cgroup_classid: | |
3030 | return &bpf_get_cgroup_classid_proto; | |
3031 | case BPF_FUNC_get_route_realm: | |
3032 | return &bpf_get_route_realm_proto; | |
3033 | case BPF_FUNC_get_hash_recalc: | |
3034 | return &bpf_get_hash_recalc_proto; | |
3035 | case BPF_FUNC_perf_event_output: | |
3036 | return &bpf_skb_event_output_proto; | |
3037 | case BPF_FUNC_get_smp_processor_id: | |
3038 | return &bpf_get_smp_processor_id_proto; | |
3039 | case BPF_FUNC_skb_under_cgroup: | |
3040 | return &bpf_skb_under_cgroup_proto; | |
3041 | default: | |
2492d3b8 | 3042 | return bpf_base_func_proto(func_id); |
3a0af8fd TG |
3043 | } |
3044 | } | |
3045 | ||
8c4b4c7e LB |
3046 | static const struct bpf_func_proto * |
3047 | sock_ops_func_proto(enum bpf_func_id func_id) | |
3048 | { | |
3049 | switch (func_id) { | |
3050 | case BPF_FUNC_setsockopt: | |
3051 | return &bpf_setsockopt_proto; | |
3052 | default: | |
3053 | return bpf_base_func_proto(func_id); | |
3054 | } | |
3055 | } | |
3056 | ||
3a0af8fd TG |
3057 | static const struct bpf_func_proto * |
3058 | lwt_xmit_func_proto(enum bpf_func_id func_id) | |
3059 | { | |
3060 | switch (func_id) { | |
3061 | case BPF_FUNC_skb_get_tunnel_key: | |
3062 | return &bpf_skb_get_tunnel_key_proto; | |
3063 | case BPF_FUNC_skb_set_tunnel_key: | |
3064 | return bpf_get_skb_set_tunnel_proto(func_id); | |
3065 | case BPF_FUNC_skb_get_tunnel_opt: | |
3066 | return &bpf_skb_get_tunnel_opt_proto; | |
3067 | case BPF_FUNC_skb_set_tunnel_opt: | |
3068 | return bpf_get_skb_set_tunnel_proto(func_id); | |
3069 | case BPF_FUNC_redirect: | |
3070 | return &bpf_redirect_proto; | |
3071 | case BPF_FUNC_clone_redirect: | |
3072 | return &bpf_clone_redirect_proto; | |
3073 | case BPF_FUNC_skb_change_tail: | |
3074 | return &bpf_skb_change_tail_proto; | |
3075 | case BPF_FUNC_skb_change_head: | |
3076 | return &bpf_skb_change_head_proto; | |
3077 | case BPF_FUNC_skb_store_bytes: | |
3078 | return &bpf_skb_store_bytes_proto; | |
3079 | case BPF_FUNC_csum_update: | |
3080 | return &bpf_csum_update_proto; | |
3081 | case BPF_FUNC_l3_csum_replace: | |
3082 | return &bpf_l3_csum_replace_proto; | |
3083 | case BPF_FUNC_l4_csum_replace: | |
3084 | return &bpf_l4_csum_replace_proto; | |
3085 | case BPF_FUNC_set_hash_invalid: | |
3086 | return &bpf_set_hash_invalid_proto; | |
3087 | default: | |
3088 | return lwt_inout_func_proto(func_id); | |
3089 | } | |
3090 | } | |
3091 | ||
f96da094 DB |
3092 | static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, |
3093 | struct bpf_insn_access_aux *info) | |
23994631 | 3094 | { |
f96da094 | 3095 | const int size_default = sizeof(__u32); |
23994631 | 3096 | |
9bac3d6d AS |
3097 | if (off < 0 || off >= sizeof(struct __sk_buff)) |
3098 | return false; | |
62c7989b | 3099 | |
4936e352 | 3100 | /* The verifier guarantees that size > 0. */ |
9bac3d6d AS |
3101 | if (off % size != 0) |
3102 | return false; | |
62c7989b DB |
3103 | |
3104 | switch (off) { | |
f96da094 DB |
3105 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
3106 | if (off + size > offsetofend(struct __sk_buff, cb[4])) | |
62c7989b DB |
3107 | return false; |
3108 | break; | |
f96da094 DB |
3109 | case bpf_ctx_range(struct __sk_buff, data): |
3110 | case bpf_ctx_range(struct __sk_buff, data_end): | |
3111 | if (size != size_default) | |
23994631 | 3112 | return false; |
31fd8581 YS |
3113 | break; |
3114 | default: | |
f96da094 | 3115 | /* Only narrow read access allowed for now. */ |
31fd8581 | 3116 | if (type == BPF_WRITE) { |
f96da094 | 3117 | if (size != size_default) |
31fd8581 YS |
3118 | return false; |
3119 | } else { | |
f96da094 DB |
3120 | bpf_ctx_record_field_size(info, size_default); |
3121 | if (!bpf_ctx_narrow_access_ok(off, size, size_default)) | |
23994631 | 3122 | return false; |
31fd8581 | 3123 | } |
62c7989b | 3124 | } |
9bac3d6d AS |
3125 | |
3126 | return true; | |
3127 | } | |
3128 | ||
d691f9e8 | 3129 | static bool sk_filter_is_valid_access(int off, int size, |
19de99f7 | 3130 | enum bpf_access_type type, |
23994631 | 3131 | struct bpf_insn_access_aux *info) |
d691f9e8 | 3132 | { |
db58ba45 | 3133 | switch (off) { |
f96da094 DB |
3134 | case bpf_ctx_range(struct __sk_buff, tc_classid): |
3135 | case bpf_ctx_range(struct __sk_buff, data): | |
3136 | case bpf_ctx_range(struct __sk_buff, data_end): | |
045efa82 | 3137 | return false; |
db58ba45 | 3138 | } |
045efa82 | 3139 | |
d691f9e8 AS |
3140 | if (type == BPF_WRITE) { |
3141 | switch (off) { | |
f96da094 | 3142 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
d691f9e8 AS |
3143 | break; |
3144 | default: | |
3145 | return false; | |
3146 | } | |
3147 | } | |
3148 | ||
f96da094 | 3149 | return bpf_skb_is_valid_access(off, size, type, info); |
d691f9e8 AS |
3150 | } |
3151 | ||
3a0af8fd TG |
3152 | static bool lwt_is_valid_access(int off, int size, |
3153 | enum bpf_access_type type, | |
23994631 | 3154 | struct bpf_insn_access_aux *info) |
3a0af8fd TG |
3155 | { |
3156 | switch (off) { | |
f96da094 | 3157 | case bpf_ctx_range(struct __sk_buff, tc_classid): |
3a0af8fd TG |
3158 | return false; |
3159 | } | |
3160 | ||
3161 | if (type == BPF_WRITE) { | |
3162 | switch (off) { | |
f96da094 DB |
3163 | case bpf_ctx_range(struct __sk_buff, mark): |
3164 | case bpf_ctx_range(struct __sk_buff, priority): | |
3165 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
3a0af8fd TG |
3166 | break; |
3167 | default: | |
3168 | return false; | |
3169 | } | |
3170 | } | |
3171 | ||
f96da094 DB |
3172 | switch (off) { |
3173 | case bpf_ctx_range(struct __sk_buff, data): | |
3174 | info->reg_type = PTR_TO_PACKET; | |
3175 | break; | |
3176 | case bpf_ctx_range(struct __sk_buff, data_end): | |
3177 | info->reg_type = PTR_TO_PACKET_END; | |
3178 | break; | |
3179 | } | |
3180 | ||
3181 | return bpf_skb_is_valid_access(off, size, type, info); | |
3a0af8fd TG |
3182 | } |
3183 | ||
61023658 DA |
3184 | static bool sock_filter_is_valid_access(int off, int size, |
3185 | enum bpf_access_type type, | |
23994631 | 3186 | struct bpf_insn_access_aux *info) |
61023658 DA |
3187 | { |
3188 | if (type == BPF_WRITE) { | |
3189 | switch (off) { | |
3190 | case offsetof(struct bpf_sock, bound_dev_if): | |
3191 | break; | |
3192 | default: | |
3193 | return false; | |
3194 | } | |
3195 | } | |
3196 | ||
3197 | if (off < 0 || off + size > sizeof(struct bpf_sock)) | |
3198 | return false; | |
61023658 DA |
3199 | /* The verifier guarantees that size > 0. */ |
3200 | if (off % size != 0) | |
3201 | return false; | |
61023658 DA |
3202 | if (size != sizeof(__u32)) |
3203 | return false; | |
3204 | ||
3205 | return true; | |
3206 | } | |
3207 | ||
36bbef52 DB |
3208 | static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, |
3209 | const struct bpf_prog *prog) | |
3210 | { | |
3211 | struct bpf_insn *insn = insn_buf; | |
3212 | ||
3213 | if (!direct_write) | |
3214 | return 0; | |
3215 | ||
3216 | /* if (!skb->cloned) | |
3217 | * goto start; | |
3218 | * | |
3219 | * (Fast-path, otherwise approximation that we might be | |
3220 | * a clone, do the rest in helper.) | |
3221 | */ | |
3222 | *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET()); | |
3223 | *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); | |
3224 | *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); | |
3225 | ||
3226 | /* ret = bpf_skb_pull_data(skb, 0); */ | |
3227 | *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); | |
3228 | *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); | |
3229 | *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, | |
3230 | BPF_FUNC_skb_pull_data); | |
3231 | /* if (!ret) | |
3232 | * goto restore; | |
3233 | * return TC_ACT_SHOT; | |
3234 | */ | |
3235 | *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); | |
3236 | *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, TC_ACT_SHOT); | |
3237 | *insn++ = BPF_EXIT_INSN(); | |
3238 | ||
3239 | /* restore: */ | |
3240 | *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); | |
3241 | /* start: */ | |
3242 | *insn++ = prog->insnsi[0]; | |
3243 | ||
3244 | return insn - insn_buf; | |
3245 | } | |
3246 | ||
d691f9e8 | 3247 | static bool tc_cls_act_is_valid_access(int off, int size, |
19de99f7 | 3248 | enum bpf_access_type type, |
23994631 | 3249 | struct bpf_insn_access_aux *info) |
d691f9e8 AS |
3250 | { |
3251 | if (type == BPF_WRITE) { | |
3252 | switch (off) { | |
f96da094 DB |
3253 | case bpf_ctx_range(struct __sk_buff, mark): |
3254 | case bpf_ctx_range(struct __sk_buff, tc_index): | |
3255 | case bpf_ctx_range(struct __sk_buff, priority): | |
3256 | case bpf_ctx_range(struct __sk_buff, tc_classid): | |
3257 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
d691f9e8 AS |
3258 | break; |
3259 | default: | |
3260 | return false; | |
3261 | } | |
3262 | } | |
19de99f7 | 3263 | |
f96da094 DB |
3264 | switch (off) { |
3265 | case bpf_ctx_range(struct __sk_buff, data): | |
3266 | info->reg_type = PTR_TO_PACKET; | |
3267 | break; | |
3268 | case bpf_ctx_range(struct __sk_buff, data_end): | |
3269 | info->reg_type = PTR_TO_PACKET_END; | |
3270 | break; | |
3271 | } | |
3272 | ||
3273 | return bpf_skb_is_valid_access(off, size, type, info); | |
d691f9e8 AS |
3274 | } |
3275 | ||
1afaf661 | 3276 | static bool __is_valid_xdp_access(int off, int size) |
6a773a15 BB |
3277 | { |
3278 | if (off < 0 || off >= sizeof(struct xdp_md)) | |
3279 | return false; | |
3280 | if (off % size != 0) | |
3281 | return false; | |
6088b582 | 3282 | if (size != sizeof(__u32)) |
6a773a15 BB |
3283 | return false; |
3284 | ||
3285 | return true; | |
3286 | } | |
3287 | ||
3288 | static bool xdp_is_valid_access(int off, int size, | |
3289 | enum bpf_access_type type, | |
23994631 | 3290 | struct bpf_insn_access_aux *info) |
6a773a15 BB |
3291 | { |
3292 | if (type == BPF_WRITE) | |
3293 | return false; | |
3294 | ||
3295 | switch (off) { | |
3296 | case offsetof(struct xdp_md, data): | |
23994631 | 3297 | info->reg_type = PTR_TO_PACKET; |
6a773a15 BB |
3298 | break; |
3299 | case offsetof(struct xdp_md, data_end): | |
23994631 | 3300 | info->reg_type = PTR_TO_PACKET_END; |
6a773a15 BB |
3301 | break; |
3302 | } | |
3303 | ||
1afaf661 | 3304 | return __is_valid_xdp_access(off, size); |
6a773a15 BB |
3305 | } |
3306 | ||
3307 | void bpf_warn_invalid_xdp_action(u32 act) | |
3308 | { | |
3309 | WARN_ONCE(1, "Illegal XDP return value %u, expect packet loss\n", act); | |
3310 | } | |
3311 | EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); | |
3312 | ||
40304b2a LB |
3313 | static bool __is_valid_sock_ops_access(int off, int size) |
3314 | { | |
3315 | if (off < 0 || off >= sizeof(struct bpf_sock_ops)) | |
3316 | return false; | |
3317 | /* The verifier guarantees that size > 0. */ | |
3318 | if (off % size != 0) | |
3319 | return false; | |
3320 | if (size != sizeof(__u32)) | |
3321 | return false; | |
3322 | ||
3323 | return true; | |
3324 | } | |
3325 | ||
3326 | static bool sock_ops_is_valid_access(int off, int size, | |
3327 | enum bpf_access_type type, | |
3328 | struct bpf_insn_access_aux *info) | |
3329 | { | |
3330 | if (type == BPF_WRITE) { | |
3331 | switch (off) { | |
3332 | case offsetof(struct bpf_sock_ops, op) ... | |
3333 | offsetof(struct bpf_sock_ops, replylong[3]): | |
3334 | break; | |
3335 | default: | |
3336 | return false; | |
3337 | } | |
3338 | } | |
3339 | ||
3340 | return __is_valid_sock_ops_access(off, size); | |
3341 | } | |
3342 | ||
2492d3b8 DB |
3343 | static u32 bpf_convert_ctx_access(enum bpf_access_type type, |
3344 | const struct bpf_insn *si, | |
3345 | struct bpf_insn *insn_buf, | |
f96da094 | 3346 | struct bpf_prog *prog, u32 *target_size) |
9bac3d6d AS |
3347 | { |
3348 | struct bpf_insn *insn = insn_buf; | |
6b8cc1d1 | 3349 | int off; |
9bac3d6d | 3350 | |
6b8cc1d1 | 3351 | switch (si->off) { |
9bac3d6d | 3352 | case offsetof(struct __sk_buff, len): |
6b8cc1d1 | 3353 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3354 | bpf_target_off(struct sk_buff, len, 4, |
3355 | target_size)); | |
9bac3d6d AS |
3356 | break; |
3357 | ||
0b8c707d | 3358 | case offsetof(struct __sk_buff, protocol): |
6b8cc1d1 | 3359 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
3360 | bpf_target_off(struct sk_buff, protocol, 2, |
3361 | target_size)); | |
0b8c707d DB |
3362 | break; |
3363 | ||
27cd5452 | 3364 | case offsetof(struct __sk_buff, vlan_proto): |
6b8cc1d1 | 3365 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
3366 | bpf_target_off(struct sk_buff, vlan_proto, 2, |
3367 | target_size)); | |
27cd5452 MS |
3368 | break; |
3369 | ||
bcad5718 | 3370 | case offsetof(struct __sk_buff, priority): |
754f1e6a | 3371 | if (type == BPF_WRITE) |
6b8cc1d1 | 3372 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3373 | bpf_target_off(struct sk_buff, priority, 4, |
3374 | target_size)); | |
754f1e6a | 3375 | else |
6b8cc1d1 | 3376 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3377 | bpf_target_off(struct sk_buff, priority, 4, |
3378 | target_size)); | |
bcad5718 DB |
3379 | break; |
3380 | ||
37e82c2f | 3381 | case offsetof(struct __sk_buff, ingress_ifindex): |
6b8cc1d1 | 3382 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3383 | bpf_target_off(struct sk_buff, skb_iif, 4, |
3384 | target_size)); | |
37e82c2f AS |
3385 | break; |
3386 | ||
3387 | case offsetof(struct __sk_buff, ifindex): | |
f035a515 | 3388 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
6b8cc1d1 | 3389 | si->dst_reg, si->src_reg, |
37e82c2f | 3390 | offsetof(struct sk_buff, dev)); |
6b8cc1d1 DB |
3391 | *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); |
3392 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
f96da094 DB |
3393 | bpf_target_off(struct net_device, ifindex, 4, |
3394 | target_size)); | |
37e82c2f AS |
3395 | break; |
3396 | ||
ba7591d8 | 3397 | case offsetof(struct __sk_buff, hash): |
6b8cc1d1 | 3398 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3399 | bpf_target_off(struct sk_buff, hash, 4, |
3400 | target_size)); | |
ba7591d8 DB |
3401 | break; |
3402 | ||
9bac3d6d | 3403 | case offsetof(struct __sk_buff, mark): |
d691f9e8 | 3404 | if (type == BPF_WRITE) |
6b8cc1d1 | 3405 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3406 | bpf_target_off(struct sk_buff, mark, 4, |
3407 | target_size)); | |
d691f9e8 | 3408 | else |
6b8cc1d1 | 3409 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3410 | bpf_target_off(struct sk_buff, mark, 4, |
3411 | target_size)); | |
d691f9e8 | 3412 | break; |
9bac3d6d AS |
3413 | |
3414 | case offsetof(struct __sk_buff, pkt_type): | |
f96da094 DB |
3415 | *target_size = 1; |
3416 | *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, | |
3417 | PKT_TYPE_OFFSET()); | |
3418 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); | |
3419 | #ifdef __BIG_ENDIAN_BITFIELD | |
3420 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); | |
3421 | #endif | |
3422 | break; | |
9bac3d6d AS |
3423 | |
3424 | case offsetof(struct __sk_buff, queue_mapping): | |
f96da094 DB |
3425 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
3426 | bpf_target_off(struct sk_buff, queue_mapping, 2, | |
3427 | target_size)); | |
3428 | break; | |
c2497395 | 3429 | |
c2497395 | 3430 | case offsetof(struct __sk_buff, vlan_present): |
c2497395 | 3431 | case offsetof(struct __sk_buff, vlan_tci): |
f96da094 DB |
3432 | BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000); |
3433 | ||
3434 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, | |
3435 | bpf_target_off(struct sk_buff, vlan_tci, 2, | |
3436 | target_size)); | |
3437 | if (si->off == offsetof(struct __sk_buff, vlan_tci)) { | |
3438 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, | |
3439 | ~VLAN_TAG_PRESENT); | |
3440 | } else { | |
3441 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 12); | |
3442 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1); | |
3443 | } | |
3444 | break; | |
d691f9e8 AS |
3445 | |
3446 | case offsetof(struct __sk_buff, cb[0]) ... | |
f96da094 | 3447 | offsetofend(struct __sk_buff, cb[4]) - 1: |
d691f9e8 | 3448 | BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, data) < 20); |
62c7989b DB |
3449 | BUILD_BUG_ON((offsetof(struct sk_buff, cb) + |
3450 | offsetof(struct qdisc_skb_cb, data)) % | |
3451 | sizeof(__u64)); | |
d691f9e8 | 3452 | |
ff936a04 | 3453 | prog->cb_access = 1; |
6b8cc1d1 DB |
3454 | off = si->off; |
3455 | off -= offsetof(struct __sk_buff, cb[0]); | |
3456 | off += offsetof(struct sk_buff, cb); | |
3457 | off += offsetof(struct qdisc_skb_cb, data); | |
d691f9e8 | 3458 | if (type == BPF_WRITE) |
62c7989b | 3459 | *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg, |
6b8cc1d1 | 3460 | si->src_reg, off); |
d691f9e8 | 3461 | else |
62c7989b | 3462 | *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, |
6b8cc1d1 | 3463 | si->src_reg, off); |
d691f9e8 AS |
3464 | break; |
3465 | ||
045efa82 | 3466 | case offsetof(struct __sk_buff, tc_classid): |
6b8cc1d1 DB |
3467 | BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, tc_classid) != 2); |
3468 | ||
3469 | off = si->off; | |
3470 | off -= offsetof(struct __sk_buff, tc_classid); | |
3471 | off += offsetof(struct sk_buff, cb); | |
3472 | off += offsetof(struct qdisc_skb_cb, tc_classid); | |
f96da094 | 3473 | *target_size = 2; |
09c37a2c | 3474 | if (type == BPF_WRITE) |
6b8cc1d1 DB |
3475 | *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, |
3476 | si->src_reg, off); | |
09c37a2c | 3477 | else |
6b8cc1d1 DB |
3478 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, |
3479 | si->src_reg, off); | |
045efa82 DB |
3480 | break; |
3481 | ||
db58ba45 | 3482 | case offsetof(struct __sk_buff, data): |
f035a515 | 3483 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), |
6b8cc1d1 | 3484 | si->dst_reg, si->src_reg, |
db58ba45 AS |
3485 | offsetof(struct sk_buff, data)); |
3486 | break; | |
3487 | ||
3488 | case offsetof(struct __sk_buff, data_end): | |
6b8cc1d1 DB |
3489 | off = si->off; |
3490 | off -= offsetof(struct __sk_buff, data_end); | |
3491 | off += offsetof(struct sk_buff, cb); | |
3492 | off += offsetof(struct bpf_skb_data_end, data_end); | |
3493 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
3494 | si->src_reg, off); | |
db58ba45 AS |
3495 | break; |
3496 | ||
d691f9e8 AS |
3497 | case offsetof(struct __sk_buff, tc_index): |
3498 | #ifdef CONFIG_NET_SCHED | |
d691f9e8 | 3499 | if (type == BPF_WRITE) |
6b8cc1d1 | 3500 | *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
3501 | bpf_target_off(struct sk_buff, tc_index, 2, |
3502 | target_size)); | |
d691f9e8 | 3503 | else |
6b8cc1d1 | 3504 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
3505 | bpf_target_off(struct sk_buff, tc_index, 2, |
3506 | target_size)); | |
d691f9e8 | 3507 | #else |
2ed46ce4 | 3508 | *target_size = 2; |
d691f9e8 | 3509 | if (type == BPF_WRITE) |
6b8cc1d1 | 3510 | *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); |
d691f9e8 | 3511 | else |
6b8cc1d1 | 3512 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
b1d9fc41 DB |
3513 | #endif |
3514 | break; | |
3515 | ||
3516 | case offsetof(struct __sk_buff, napi_id): | |
3517 | #if defined(CONFIG_NET_RX_BUSY_POLL) | |
b1d9fc41 | 3518 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3519 | bpf_target_off(struct sk_buff, napi_id, 4, |
3520 | target_size)); | |
b1d9fc41 DB |
3521 | *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); |
3522 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); | |
3523 | #else | |
2ed46ce4 | 3524 | *target_size = 4; |
b1d9fc41 | 3525 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
d691f9e8 | 3526 | #endif |
6b8cc1d1 | 3527 | break; |
9bac3d6d AS |
3528 | } |
3529 | ||
3530 | return insn - insn_buf; | |
89aa0758 AS |
3531 | } |
3532 | ||
61023658 | 3533 | static u32 sock_filter_convert_ctx_access(enum bpf_access_type type, |
6b8cc1d1 | 3534 | const struct bpf_insn *si, |
61023658 | 3535 | struct bpf_insn *insn_buf, |
f96da094 | 3536 | struct bpf_prog *prog, u32 *target_size) |
61023658 DA |
3537 | { |
3538 | struct bpf_insn *insn = insn_buf; | |
3539 | ||
6b8cc1d1 | 3540 | switch (si->off) { |
61023658 DA |
3541 | case offsetof(struct bpf_sock, bound_dev_if): |
3542 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_bound_dev_if) != 4); | |
3543 | ||
3544 | if (type == BPF_WRITE) | |
6b8cc1d1 | 3545 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
61023658 DA |
3546 | offsetof(struct sock, sk_bound_dev_if)); |
3547 | else | |
6b8cc1d1 | 3548 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
61023658 DA |
3549 | offsetof(struct sock, sk_bound_dev_if)); |
3550 | break; | |
aa4c1037 DA |
3551 | |
3552 | case offsetof(struct bpf_sock, family): | |
3553 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_family) != 2); | |
3554 | ||
6b8cc1d1 | 3555 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
aa4c1037 DA |
3556 | offsetof(struct sock, sk_family)); |
3557 | break; | |
3558 | ||
3559 | case offsetof(struct bpf_sock, type): | |
6b8cc1d1 | 3560 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
aa4c1037 | 3561 | offsetof(struct sock, __sk_flags_offset)); |
6b8cc1d1 DB |
3562 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK); |
3563 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT); | |
aa4c1037 DA |
3564 | break; |
3565 | ||
3566 | case offsetof(struct bpf_sock, protocol): | |
6b8cc1d1 | 3567 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
aa4c1037 | 3568 | offsetof(struct sock, __sk_flags_offset)); |
6b8cc1d1 DB |
3569 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK); |
3570 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_PROTO_SHIFT); | |
aa4c1037 | 3571 | break; |
61023658 DA |
3572 | } |
3573 | ||
3574 | return insn - insn_buf; | |
3575 | } | |
3576 | ||
6b8cc1d1 DB |
3577 | static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, |
3578 | const struct bpf_insn *si, | |
374fb54e | 3579 | struct bpf_insn *insn_buf, |
f96da094 | 3580 | struct bpf_prog *prog, u32 *target_size) |
374fb54e DB |
3581 | { |
3582 | struct bpf_insn *insn = insn_buf; | |
3583 | ||
6b8cc1d1 | 3584 | switch (si->off) { |
374fb54e | 3585 | case offsetof(struct __sk_buff, ifindex): |
374fb54e | 3586 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
6b8cc1d1 | 3587 | si->dst_reg, si->src_reg, |
374fb54e | 3588 | offsetof(struct sk_buff, dev)); |
6b8cc1d1 | 3589 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
f96da094 DB |
3590 | bpf_target_off(struct net_device, ifindex, 4, |
3591 | target_size)); | |
374fb54e DB |
3592 | break; |
3593 | default: | |
f96da094 DB |
3594 | return bpf_convert_ctx_access(type, si, insn_buf, prog, |
3595 | target_size); | |
374fb54e DB |
3596 | } |
3597 | ||
3598 | return insn - insn_buf; | |
3599 | } | |
3600 | ||
6b8cc1d1 DB |
3601 | static u32 xdp_convert_ctx_access(enum bpf_access_type type, |
3602 | const struct bpf_insn *si, | |
6a773a15 | 3603 | struct bpf_insn *insn_buf, |
f96da094 | 3604 | struct bpf_prog *prog, u32 *target_size) |
6a773a15 BB |
3605 | { |
3606 | struct bpf_insn *insn = insn_buf; | |
3607 | ||
6b8cc1d1 | 3608 | switch (si->off) { |
6a773a15 | 3609 | case offsetof(struct xdp_md, data): |
f035a515 | 3610 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), |
6b8cc1d1 | 3611 | si->dst_reg, si->src_reg, |
6a773a15 BB |
3612 | offsetof(struct xdp_buff, data)); |
3613 | break; | |
3614 | case offsetof(struct xdp_md, data_end): | |
f035a515 | 3615 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), |
6b8cc1d1 | 3616 | si->dst_reg, si->src_reg, |
6a773a15 BB |
3617 | offsetof(struct xdp_buff, data_end)); |
3618 | break; | |
3619 | } | |
3620 | ||
3621 | return insn - insn_buf; | |
3622 | } | |
3623 | ||
40304b2a LB |
3624 | static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, |
3625 | const struct bpf_insn *si, | |
3626 | struct bpf_insn *insn_buf, | |
f96da094 DB |
3627 | struct bpf_prog *prog, |
3628 | u32 *target_size) | |
40304b2a LB |
3629 | { |
3630 | struct bpf_insn *insn = insn_buf; | |
3631 | int off; | |
3632 | ||
3633 | switch (si->off) { | |
3634 | case offsetof(struct bpf_sock_ops, op) ... | |
3635 | offsetof(struct bpf_sock_ops, replylong[3]): | |
3636 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, op) != | |
3637 | FIELD_SIZEOF(struct bpf_sock_ops_kern, op)); | |
3638 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, reply) != | |
3639 | FIELD_SIZEOF(struct bpf_sock_ops_kern, reply)); | |
3640 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, replylong) != | |
3641 | FIELD_SIZEOF(struct bpf_sock_ops_kern, replylong)); | |
3642 | off = si->off; | |
3643 | off -= offsetof(struct bpf_sock_ops, op); | |
3644 | off += offsetof(struct bpf_sock_ops_kern, op); | |
3645 | if (type == BPF_WRITE) | |
3646 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
3647 | off); | |
3648 | else | |
3649 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
3650 | off); | |
3651 | break; | |
3652 | ||
3653 | case offsetof(struct bpf_sock_ops, family): | |
3654 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); | |
3655 | ||
3656 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
3657 | struct bpf_sock_ops_kern, sk), | |
3658 | si->dst_reg, si->src_reg, | |
3659 | offsetof(struct bpf_sock_ops_kern, sk)); | |
3660 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
3661 | offsetof(struct sock_common, skc_family)); | |
3662 | break; | |
3663 | ||
3664 | case offsetof(struct bpf_sock_ops, remote_ip4): | |
3665 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); | |
3666 | ||
3667 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
3668 | struct bpf_sock_ops_kern, sk), | |
3669 | si->dst_reg, si->src_reg, | |
3670 | offsetof(struct bpf_sock_ops_kern, sk)); | |
3671 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
3672 | offsetof(struct sock_common, skc_daddr)); | |
3673 | break; | |
3674 | ||
3675 | case offsetof(struct bpf_sock_ops, local_ip4): | |
3676 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_rcv_saddr) != 4); | |
3677 | ||
3678 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
3679 | struct bpf_sock_ops_kern, sk), | |
3680 | si->dst_reg, si->src_reg, | |
3681 | offsetof(struct bpf_sock_ops_kern, sk)); | |
3682 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
3683 | offsetof(struct sock_common, | |
3684 | skc_rcv_saddr)); | |
3685 | break; | |
3686 | ||
3687 | case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... | |
3688 | offsetof(struct bpf_sock_ops, remote_ip6[3]): | |
3689 | #if IS_ENABLED(CONFIG_IPV6) | |
3690 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
3691 | skc_v6_daddr.s6_addr32[0]) != 4); | |
3692 | ||
3693 | off = si->off; | |
3694 | off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); | |
3695 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
3696 | struct bpf_sock_ops_kern, sk), | |
3697 | si->dst_reg, si->src_reg, | |
3698 | offsetof(struct bpf_sock_ops_kern, sk)); | |
3699 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
3700 | offsetof(struct sock_common, | |
3701 | skc_v6_daddr.s6_addr32[0]) + | |
3702 | off); | |
3703 | #else | |
3704 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
3705 | #endif | |
3706 | break; | |
3707 | ||
3708 | case offsetof(struct bpf_sock_ops, local_ip6[0]) ... | |
3709 | offsetof(struct bpf_sock_ops, local_ip6[3]): | |
3710 | #if IS_ENABLED(CONFIG_IPV6) | |
3711 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
3712 | skc_v6_rcv_saddr.s6_addr32[0]) != 4); | |
3713 | ||
3714 | off = si->off; | |
3715 | off -= offsetof(struct bpf_sock_ops, local_ip6[0]); | |
3716 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
3717 | struct bpf_sock_ops_kern, sk), | |
3718 | si->dst_reg, si->src_reg, | |
3719 | offsetof(struct bpf_sock_ops_kern, sk)); | |
3720 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
3721 | offsetof(struct sock_common, | |
3722 | skc_v6_rcv_saddr.s6_addr32[0]) + | |
3723 | off); | |
3724 | #else | |
3725 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
3726 | #endif | |
3727 | break; | |
3728 | ||
3729 | case offsetof(struct bpf_sock_ops, remote_port): | |
3730 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); | |
3731 | ||
3732 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
3733 | struct bpf_sock_ops_kern, sk), | |
3734 | si->dst_reg, si->src_reg, | |
3735 | offsetof(struct bpf_sock_ops_kern, sk)); | |
3736 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
3737 | offsetof(struct sock_common, skc_dport)); | |
3738 | #ifndef __BIG_ENDIAN_BITFIELD | |
3739 | *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); | |
3740 | #endif | |
3741 | break; | |
3742 | ||
3743 | case offsetof(struct bpf_sock_ops, local_port): | |
3744 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); | |
3745 | ||
3746 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
3747 | struct bpf_sock_ops_kern, sk), | |
3748 | si->dst_reg, si->src_reg, | |
3749 | offsetof(struct bpf_sock_ops_kern, sk)); | |
3750 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
3751 | offsetof(struct sock_common, skc_num)); | |
3752 | break; | |
3753 | } | |
3754 | return insn - insn_buf; | |
3755 | } | |
3756 | ||
be9370a7 | 3757 | const struct bpf_verifier_ops sk_filter_prog_ops = { |
4936e352 DB |
3758 | .get_func_proto = sk_filter_func_proto, |
3759 | .is_valid_access = sk_filter_is_valid_access, | |
2492d3b8 | 3760 | .convert_ctx_access = bpf_convert_ctx_access, |
89aa0758 AS |
3761 | }; |
3762 | ||
be9370a7 | 3763 | const struct bpf_verifier_ops tc_cls_act_prog_ops = { |
4936e352 DB |
3764 | .get_func_proto = tc_cls_act_func_proto, |
3765 | .is_valid_access = tc_cls_act_is_valid_access, | |
374fb54e | 3766 | .convert_ctx_access = tc_cls_act_convert_ctx_access, |
36bbef52 | 3767 | .gen_prologue = tc_cls_act_prologue, |
1cf1cae9 | 3768 | .test_run = bpf_prog_test_run_skb, |
608cd71a AS |
3769 | }; |
3770 | ||
be9370a7 | 3771 | const struct bpf_verifier_ops xdp_prog_ops = { |
6a773a15 BB |
3772 | .get_func_proto = xdp_func_proto, |
3773 | .is_valid_access = xdp_is_valid_access, | |
3774 | .convert_ctx_access = xdp_convert_ctx_access, | |
1cf1cae9 | 3775 | .test_run = bpf_prog_test_run_xdp, |
6a773a15 BB |
3776 | }; |
3777 | ||
be9370a7 | 3778 | const struct bpf_verifier_ops cg_skb_prog_ops = { |
966789fb | 3779 | .get_func_proto = sk_filter_func_proto, |
0e33661d | 3780 | .is_valid_access = sk_filter_is_valid_access, |
2492d3b8 | 3781 | .convert_ctx_access = bpf_convert_ctx_access, |
1cf1cae9 | 3782 | .test_run = bpf_prog_test_run_skb, |
0e33661d DM |
3783 | }; |
3784 | ||
be9370a7 | 3785 | const struct bpf_verifier_ops lwt_inout_prog_ops = { |
3a0af8fd TG |
3786 | .get_func_proto = lwt_inout_func_proto, |
3787 | .is_valid_access = lwt_is_valid_access, | |
2492d3b8 | 3788 | .convert_ctx_access = bpf_convert_ctx_access, |
1cf1cae9 | 3789 | .test_run = bpf_prog_test_run_skb, |
3a0af8fd TG |
3790 | }; |
3791 | ||
be9370a7 | 3792 | const struct bpf_verifier_ops lwt_xmit_prog_ops = { |
3a0af8fd TG |
3793 | .get_func_proto = lwt_xmit_func_proto, |
3794 | .is_valid_access = lwt_is_valid_access, | |
2492d3b8 | 3795 | .convert_ctx_access = bpf_convert_ctx_access, |
3a0af8fd | 3796 | .gen_prologue = tc_cls_act_prologue, |
1cf1cae9 | 3797 | .test_run = bpf_prog_test_run_skb, |
3a0af8fd TG |
3798 | }; |
3799 | ||
be9370a7 | 3800 | const struct bpf_verifier_ops cg_sock_prog_ops = { |
2492d3b8 | 3801 | .get_func_proto = bpf_base_func_proto, |
61023658 DA |
3802 | .is_valid_access = sock_filter_is_valid_access, |
3803 | .convert_ctx_access = sock_filter_convert_ctx_access, | |
3804 | }; | |
3805 | ||
40304b2a | 3806 | const struct bpf_verifier_ops sock_ops_prog_ops = { |
8c4b4c7e | 3807 | .get_func_proto = sock_ops_func_proto, |
40304b2a LB |
3808 | .is_valid_access = sock_ops_is_valid_access, |
3809 | .convert_ctx_access = sock_ops_convert_ctx_access, | |
3810 | }; | |
3811 | ||
8ced425e | 3812 | int sk_detach_filter(struct sock *sk) |
55b33325 PE |
3813 | { |
3814 | int ret = -ENOENT; | |
3815 | struct sk_filter *filter; | |
3816 | ||
d59577b6 VB |
3817 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
3818 | return -EPERM; | |
3819 | ||
8ced425e HFS |
3820 | filter = rcu_dereference_protected(sk->sk_filter, |
3821 | lockdep_sock_is_held(sk)); | |
55b33325 | 3822 | if (filter) { |
a9b3cd7f | 3823 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
46bcf14f | 3824 | sk_filter_uncharge(sk, filter); |
55b33325 PE |
3825 | ret = 0; |
3826 | } | |
a3ea269b | 3827 | |
55b33325 PE |
3828 | return ret; |
3829 | } | |
8ced425e | 3830 | EXPORT_SYMBOL_GPL(sk_detach_filter); |
a8fc9277 | 3831 | |
a3ea269b DB |
3832 | int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf, |
3833 | unsigned int len) | |
a8fc9277 | 3834 | { |
a3ea269b | 3835 | struct sock_fprog_kern *fprog; |
a8fc9277 | 3836 | struct sk_filter *filter; |
a3ea269b | 3837 | int ret = 0; |
a8fc9277 PE |
3838 | |
3839 | lock_sock(sk); | |
3840 | filter = rcu_dereference_protected(sk->sk_filter, | |
8ced425e | 3841 | lockdep_sock_is_held(sk)); |
a8fc9277 PE |
3842 | if (!filter) |
3843 | goto out; | |
a3ea269b DB |
3844 | |
3845 | /* We're copying the filter that has been originally attached, | |
93d08b69 DB |
3846 | * so no conversion/decode needed anymore. eBPF programs that |
3847 | * have no original program cannot be dumped through this. | |
a3ea269b | 3848 | */ |
93d08b69 | 3849 | ret = -EACCES; |
7ae457c1 | 3850 | fprog = filter->prog->orig_prog; |
93d08b69 DB |
3851 | if (!fprog) |
3852 | goto out; | |
a3ea269b DB |
3853 | |
3854 | ret = fprog->len; | |
a8fc9277 | 3855 | if (!len) |
a3ea269b | 3856 | /* User space only enquires number of filter blocks. */ |
a8fc9277 | 3857 | goto out; |
a3ea269b | 3858 | |
a8fc9277 | 3859 | ret = -EINVAL; |
a3ea269b | 3860 | if (len < fprog->len) |
a8fc9277 PE |
3861 | goto out; |
3862 | ||
3863 | ret = -EFAULT; | |
009937e7 | 3864 | if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog))) |
a3ea269b | 3865 | goto out; |
a8fc9277 | 3866 | |
a3ea269b DB |
3867 | /* Instead of bytes, the API requests to return the number |
3868 | * of filter blocks. | |
3869 | */ | |
3870 | ret = fprog->len; | |
a8fc9277 PE |
3871 | out: |
3872 | release_sock(sk); | |
3873 | return ret; | |
3874 | } |