Commit | Line | Data |
---|---|---|
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> |
5acaee0a | 58 | #include <linux/bpf_trace.h> |
1da177e4 | 59 | |
43db6d65 | 60 | /** |
f4979fce | 61 | * sk_filter_trim_cap - run a packet through a socket filter |
43db6d65 SH |
62 | * @sk: sock associated with &sk_buff |
63 | * @skb: buffer to filter | |
f4979fce | 64 | * @cap: limit on how short the eBPF program may trim the packet |
43db6d65 | 65 | * |
ff936a04 AS |
66 | * Run the eBPF program and then cut skb->data to correct size returned by |
67 | * the program. If pkt_len is 0 we toss packet. If skb->len is smaller | |
43db6d65 | 68 | * than pkt_len we keep whole skb->data. This is the socket level |
ff936a04 | 69 | * wrapper to BPF_PROG_RUN. It returns 0 if the packet should |
43db6d65 SH |
70 | * be accepted or -EPERM if the packet should be tossed. |
71 | * | |
72 | */ | |
f4979fce | 73 | int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) |
43db6d65 SH |
74 | { |
75 | int err; | |
76 | struct sk_filter *filter; | |
77 | ||
c93bdd0e MG |
78 | /* |
79 | * If the skb was allocated from pfmemalloc reserves, only | |
80 | * allow SOCK_MEMALLOC sockets to use it as this socket is | |
81 | * helping free memory | |
82 | */ | |
8fe809a9 ED |
83 | if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) { |
84 | NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP); | |
c93bdd0e | 85 | return -ENOMEM; |
8fe809a9 | 86 | } |
c11cd3a6 DM |
87 | err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); |
88 | if (err) | |
89 | return err; | |
90 | ||
43db6d65 SH |
91 | err = security_sock_rcv_skb(sk, skb); |
92 | if (err) | |
93 | return err; | |
94 | ||
80f8f102 ED |
95 | rcu_read_lock(); |
96 | filter = rcu_dereference(sk->sk_filter); | |
43db6d65 | 97 | if (filter) { |
8f917bba WB |
98 | struct sock *save_sk = skb->sk; |
99 | unsigned int pkt_len; | |
100 | ||
101 | skb->sk = sk; | |
102 | pkt_len = bpf_prog_run_save_cb(filter->prog, skb); | |
8f917bba | 103 | skb->sk = save_sk; |
d1f496fd | 104 | err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM; |
43db6d65 | 105 | } |
80f8f102 | 106 | rcu_read_unlock(); |
43db6d65 SH |
107 | |
108 | return err; | |
109 | } | |
f4979fce | 110 | EXPORT_SYMBOL(sk_filter_trim_cap); |
43db6d65 | 111 | |
f3694e00 | 112 | BPF_CALL_1(__skb_get_pay_offset, struct sk_buff *, skb) |
bd4cf0ed | 113 | { |
f3694e00 | 114 | return skb_get_poff(skb); |
bd4cf0ed AS |
115 | } |
116 | ||
f3694e00 | 117 | BPF_CALL_3(__skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x) |
bd4cf0ed | 118 | { |
bd4cf0ed AS |
119 | struct nlattr *nla; |
120 | ||
121 | if (skb_is_nonlinear(skb)) | |
122 | return 0; | |
123 | ||
05ab8f26 MK |
124 | if (skb->len < sizeof(struct nlattr)) |
125 | return 0; | |
126 | ||
30743837 | 127 | if (a > skb->len - sizeof(struct nlattr)) |
bd4cf0ed AS |
128 | return 0; |
129 | ||
30743837 | 130 | nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x); |
bd4cf0ed AS |
131 | if (nla) |
132 | return (void *) nla - (void *) skb->data; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
f3694e00 | 137 | BPF_CALL_3(__skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x) |
bd4cf0ed | 138 | { |
bd4cf0ed AS |
139 | struct nlattr *nla; |
140 | ||
141 | if (skb_is_nonlinear(skb)) | |
142 | return 0; | |
143 | ||
05ab8f26 MK |
144 | if (skb->len < sizeof(struct nlattr)) |
145 | return 0; | |
146 | ||
30743837 | 147 | if (a > skb->len - sizeof(struct nlattr)) |
bd4cf0ed AS |
148 | return 0; |
149 | ||
30743837 DB |
150 | nla = (struct nlattr *) &skb->data[a]; |
151 | if (nla->nla_len > skb->len - a) | |
bd4cf0ed AS |
152 | return 0; |
153 | ||
30743837 | 154 | nla = nla_find_nested(nla, x); |
bd4cf0ed AS |
155 | if (nla) |
156 | return (void *) nla - (void *) skb->data; | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
f3694e00 | 161 | BPF_CALL_0(__get_raw_cpu_id) |
bd4cf0ed AS |
162 | { |
163 | return raw_smp_processor_id(); | |
164 | } | |
165 | ||
80b48c44 DB |
166 | static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = { |
167 | .func = __get_raw_cpu_id, | |
168 | .gpl_only = false, | |
169 | .ret_type = RET_INTEGER, | |
170 | }; | |
171 | ||
9bac3d6d AS |
172 | static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg, |
173 | struct bpf_insn *insn_buf) | |
174 | { | |
175 | struct bpf_insn *insn = insn_buf; | |
176 | ||
177 | switch (skb_field) { | |
178 | case SKF_AD_MARK: | |
179 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, mark) != 4); | |
180 | ||
181 | *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, | |
182 | offsetof(struct sk_buff, mark)); | |
183 | break; | |
184 | ||
185 | case SKF_AD_PKTTYPE: | |
186 | *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET()); | |
187 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX); | |
188 | #ifdef __BIG_ENDIAN_BITFIELD | |
189 | *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5); | |
190 | #endif | |
191 | break; | |
192 | ||
193 | case SKF_AD_QUEUE: | |
194 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, queue_mapping) != 2); | |
195 | ||
196 | *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, | |
197 | offsetof(struct sk_buff, queue_mapping)); | |
198 | break; | |
c2497395 | 199 | |
c2497395 AS |
200 | case SKF_AD_VLAN_TAG: |
201 | case SKF_AD_VLAN_TAG_PRESENT: | |
202 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2); | |
203 | BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000); | |
204 | ||
205 | /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */ | |
206 | *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, | |
207 | offsetof(struct sk_buff, vlan_tci)); | |
208 | if (skb_field == SKF_AD_VLAN_TAG) { | |
209 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, | |
210 | ~VLAN_TAG_PRESENT); | |
211 | } else { | |
212 | /* dst_reg >>= 12 */ | |
213 | *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 12); | |
214 | /* dst_reg &= 1 */ | |
215 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1); | |
216 | } | |
217 | break; | |
9bac3d6d AS |
218 | } |
219 | ||
220 | return insn - insn_buf; | |
221 | } | |
222 | ||
bd4cf0ed | 223 | static bool convert_bpf_extensions(struct sock_filter *fp, |
2695fb55 | 224 | struct bpf_insn **insnp) |
bd4cf0ed | 225 | { |
2695fb55 | 226 | struct bpf_insn *insn = *insnp; |
9bac3d6d | 227 | u32 cnt; |
bd4cf0ed AS |
228 | |
229 | switch (fp->k) { | |
230 | case SKF_AD_OFF + SKF_AD_PROTOCOL: | |
0b8c707d DB |
231 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, protocol) != 2); |
232 | ||
233 | /* A = *(u16 *) (CTX + offsetof(protocol)) */ | |
234 | *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, | |
235 | offsetof(struct sk_buff, protocol)); | |
236 | /* A = ntohs(A) [emitting a nop or swap16] */ | |
237 | *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); | |
bd4cf0ed AS |
238 | break; |
239 | ||
240 | case SKF_AD_OFF + SKF_AD_PKTTYPE: | |
9bac3d6d AS |
241 | cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn); |
242 | insn += cnt - 1; | |
bd4cf0ed AS |
243 | break; |
244 | ||
245 | case SKF_AD_OFF + SKF_AD_IFINDEX: | |
246 | case SKF_AD_OFF + SKF_AD_HATYPE: | |
bd4cf0ed AS |
247 | BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, ifindex) != 4); |
248 | BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, type) != 2); | |
f8f6d679 | 249 | |
f035a515 | 250 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
f8f6d679 DB |
251 | BPF_REG_TMP, BPF_REG_CTX, |
252 | offsetof(struct sk_buff, dev)); | |
253 | /* if (tmp != 0) goto pc + 1 */ | |
254 | *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1); | |
255 | *insn++ = BPF_EXIT_INSN(); | |
256 | if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX) | |
257 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP, | |
258 | offsetof(struct net_device, ifindex)); | |
259 | else | |
260 | *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP, | |
261 | offsetof(struct net_device, type)); | |
bd4cf0ed AS |
262 | break; |
263 | ||
264 | case SKF_AD_OFF + SKF_AD_MARK: | |
9bac3d6d AS |
265 | cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn); |
266 | insn += cnt - 1; | |
bd4cf0ed AS |
267 | break; |
268 | ||
269 | case SKF_AD_OFF + SKF_AD_RXHASH: | |
270 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, hash) != 4); | |
271 | ||
9739eef1 AS |
272 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, |
273 | offsetof(struct sk_buff, hash)); | |
bd4cf0ed AS |
274 | break; |
275 | ||
276 | case SKF_AD_OFF + SKF_AD_QUEUE: | |
9bac3d6d AS |
277 | cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn); |
278 | insn += cnt - 1; | |
bd4cf0ed AS |
279 | break; |
280 | ||
281 | case SKF_AD_OFF + SKF_AD_VLAN_TAG: | |
c2497395 AS |
282 | cnt = convert_skb_access(SKF_AD_VLAN_TAG, |
283 | BPF_REG_A, BPF_REG_CTX, insn); | |
284 | insn += cnt - 1; | |
285 | break; | |
bd4cf0ed | 286 | |
c2497395 AS |
287 | case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT: |
288 | cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT, | |
289 | BPF_REG_A, BPF_REG_CTX, insn); | |
290 | insn += cnt - 1; | |
bd4cf0ed AS |
291 | break; |
292 | ||
27cd5452 MS |
293 | case SKF_AD_OFF + SKF_AD_VLAN_TPID: |
294 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_proto) != 2); | |
295 | ||
296 | /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */ | |
297 | *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, | |
298 | offsetof(struct sk_buff, vlan_proto)); | |
299 | /* A = ntohs(A) [emitting a nop or swap16] */ | |
300 | *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); | |
301 | break; | |
302 | ||
bd4cf0ed AS |
303 | case SKF_AD_OFF + SKF_AD_PAY_OFFSET: |
304 | case SKF_AD_OFF + SKF_AD_NLATTR: | |
305 | case SKF_AD_OFF + SKF_AD_NLATTR_NEST: | |
306 | case SKF_AD_OFF + SKF_AD_CPU: | |
4cd3675e | 307 | case SKF_AD_OFF + SKF_AD_RANDOM: |
e430f34e | 308 | /* arg1 = CTX */ |
f8f6d679 | 309 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); |
bd4cf0ed | 310 | /* arg2 = A */ |
f8f6d679 | 311 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A); |
bd4cf0ed | 312 | /* arg3 = X */ |
f8f6d679 | 313 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X); |
e430f34e | 314 | /* Emit call(arg1=CTX, arg2=A, arg3=X) */ |
bd4cf0ed AS |
315 | switch (fp->k) { |
316 | case SKF_AD_OFF + SKF_AD_PAY_OFFSET: | |
f8f6d679 | 317 | *insn = BPF_EMIT_CALL(__skb_get_pay_offset); |
bd4cf0ed AS |
318 | break; |
319 | case SKF_AD_OFF + SKF_AD_NLATTR: | |
f8f6d679 | 320 | *insn = BPF_EMIT_CALL(__skb_get_nlattr); |
bd4cf0ed AS |
321 | break; |
322 | case SKF_AD_OFF + SKF_AD_NLATTR_NEST: | |
f8f6d679 | 323 | *insn = BPF_EMIT_CALL(__skb_get_nlattr_nest); |
bd4cf0ed AS |
324 | break; |
325 | case SKF_AD_OFF + SKF_AD_CPU: | |
f8f6d679 | 326 | *insn = BPF_EMIT_CALL(__get_raw_cpu_id); |
bd4cf0ed | 327 | break; |
4cd3675e | 328 | case SKF_AD_OFF + SKF_AD_RANDOM: |
3ad00405 DB |
329 | *insn = BPF_EMIT_CALL(bpf_user_rnd_u32); |
330 | bpf_user_rnd_init_once(); | |
4cd3675e | 331 | break; |
bd4cf0ed AS |
332 | } |
333 | break; | |
334 | ||
335 | case SKF_AD_OFF + SKF_AD_ALU_XOR_X: | |
9739eef1 AS |
336 | /* A ^= X */ |
337 | *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X); | |
bd4cf0ed AS |
338 | break; |
339 | ||
340 | default: | |
341 | /* This is just a dummy call to avoid letting the compiler | |
342 | * evict __bpf_call_base() as an optimization. Placed here | |
343 | * where no-one bothers. | |
344 | */ | |
345 | BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0); | |
346 | return false; | |
347 | } | |
348 | ||
349 | *insnp = insn; | |
350 | return true; | |
351 | } | |
352 | ||
353 | /** | |
8fb575ca | 354 | * bpf_convert_filter - convert filter program |
bd4cf0ed AS |
355 | * @prog: the user passed filter program |
356 | * @len: the length of the user passed filter program | |
50bbfed9 | 357 | * @new_prog: allocated 'struct bpf_prog' or NULL |
bd4cf0ed AS |
358 | * @new_len: pointer to store length of converted program |
359 | * | |
1f504ec9 TK |
360 | * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn' |
361 | * style extended BPF (eBPF). | |
bd4cf0ed AS |
362 | * Conversion workflow: |
363 | * | |
364 | * 1) First pass for calculating the new program length: | |
8fb575ca | 365 | * bpf_convert_filter(old_prog, old_len, NULL, &new_len) |
bd4cf0ed AS |
366 | * |
367 | * 2) 2nd pass to remap in two passes: 1st pass finds new | |
368 | * jump offsets, 2nd pass remapping: | |
8fb575ca | 369 | * bpf_convert_filter(old_prog, old_len, new_prog, &new_len); |
bd4cf0ed | 370 | */ |
d9e12f42 | 371 | static int bpf_convert_filter(struct sock_filter *prog, int len, |
50bbfed9 | 372 | struct bpf_prog *new_prog, int *new_len) |
bd4cf0ed | 373 | { |
50bbfed9 AS |
374 | int new_flen = 0, pass = 0, target, i, stack_off; |
375 | struct bpf_insn *new_insn, *first_insn = NULL; | |
bd4cf0ed AS |
376 | struct sock_filter *fp; |
377 | int *addrs = NULL; | |
378 | u8 bpf_src; | |
379 | ||
380 | BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); | |
30743837 | 381 | BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); |
bd4cf0ed | 382 | |
6f9a093b | 383 | if (len <= 0 || len > BPF_MAXINSNS) |
bd4cf0ed AS |
384 | return -EINVAL; |
385 | ||
386 | if (new_prog) { | |
50bbfed9 | 387 | first_insn = new_prog->insnsi; |
658da937 DB |
388 | addrs = kcalloc(len, sizeof(*addrs), |
389 | GFP_KERNEL | __GFP_NOWARN); | |
bd4cf0ed AS |
390 | if (!addrs) |
391 | return -ENOMEM; | |
392 | } | |
393 | ||
394 | do_pass: | |
50bbfed9 | 395 | new_insn = first_insn; |
bd4cf0ed AS |
396 | fp = prog; |
397 | ||
8b614aeb | 398 | /* Classic BPF related prologue emission. */ |
50bbfed9 | 399 | if (new_prog) { |
8b614aeb DB |
400 | /* Classic BPF expects A and X to be reset first. These need |
401 | * to be guaranteed to be the first two instructions. | |
402 | */ | |
403 | *new_insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); | |
404 | *new_insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_X, BPF_REG_X); | |
405 | ||
406 | /* All programs must keep CTX in callee saved BPF_REG_CTX. | |
407 | * In eBPF case it's done by the compiler, here we need to | |
408 | * do this ourself. Initial CTX is present in BPF_REG_ARG1. | |
409 | */ | |
410 | *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1); | |
411 | } else { | |
412 | new_insn += 3; | |
413 | } | |
bd4cf0ed AS |
414 | |
415 | for (i = 0; i < len; fp++, i++) { | |
2695fb55 AS |
416 | struct bpf_insn tmp_insns[6] = { }; |
417 | struct bpf_insn *insn = tmp_insns; | |
bd4cf0ed AS |
418 | |
419 | if (addrs) | |
50bbfed9 | 420 | addrs[i] = new_insn - first_insn; |
bd4cf0ed AS |
421 | |
422 | switch (fp->code) { | |
423 | /* All arithmetic insns and skb loads map as-is. */ | |
424 | case BPF_ALU | BPF_ADD | BPF_X: | |
425 | case BPF_ALU | BPF_ADD | BPF_K: | |
426 | case BPF_ALU | BPF_SUB | BPF_X: | |
427 | case BPF_ALU | BPF_SUB | BPF_K: | |
428 | case BPF_ALU | BPF_AND | BPF_X: | |
429 | case BPF_ALU | BPF_AND | BPF_K: | |
430 | case BPF_ALU | BPF_OR | BPF_X: | |
431 | case BPF_ALU | BPF_OR | BPF_K: | |
432 | case BPF_ALU | BPF_LSH | BPF_X: | |
433 | case BPF_ALU | BPF_LSH | BPF_K: | |
434 | case BPF_ALU | BPF_RSH | BPF_X: | |
435 | case BPF_ALU | BPF_RSH | BPF_K: | |
436 | case BPF_ALU | BPF_XOR | BPF_X: | |
437 | case BPF_ALU | BPF_XOR | BPF_K: | |
438 | case BPF_ALU | BPF_MUL | BPF_X: | |
439 | case BPF_ALU | BPF_MUL | BPF_K: | |
440 | case BPF_ALU | BPF_DIV | BPF_X: | |
441 | case BPF_ALU | BPF_DIV | BPF_K: | |
442 | case BPF_ALU | BPF_MOD | BPF_X: | |
443 | case BPF_ALU | BPF_MOD | BPF_K: | |
444 | case BPF_ALU | BPF_NEG: | |
445 | case BPF_LD | BPF_ABS | BPF_W: | |
446 | case BPF_LD | BPF_ABS | BPF_H: | |
447 | case BPF_LD | BPF_ABS | BPF_B: | |
448 | case BPF_LD | BPF_IND | BPF_W: | |
449 | case BPF_LD | BPF_IND | BPF_H: | |
450 | case BPF_LD | BPF_IND | BPF_B: | |
451 | /* Check for overloaded BPF extension and | |
452 | * directly convert it if found, otherwise | |
453 | * just move on with mapping. | |
454 | */ | |
455 | if (BPF_CLASS(fp->code) == BPF_LD && | |
456 | BPF_MODE(fp->code) == BPF_ABS && | |
457 | convert_bpf_extensions(fp, &insn)) | |
458 | break; | |
459 | ||
f8f6d679 | 460 | *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k); |
bd4cf0ed AS |
461 | break; |
462 | ||
f8f6d679 DB |
463 | /* Jump transformation cannot use BPF block macros |
464 | * everywhere as offset calculation and target updates | |
465 | * require a bit more work than the rest, i.e. jump | |
466 | * opcodes map as-is, but offsets need adjustment. | |
467 | */ | |
468 | ||
469 | #define BPF_EMIT_JMP \ | |
bd4cf0ed AS |
470 | do { \ |
471 | if (target >= len || target < 0) \ | |
472 | goto err; \ | |
473 | insn->off = addrs ? addrs[target] - addrs[i] - 1 : 0; \ | |
474 | /* Adjust pc relative offset for 2nd or 3rd insn. */ \ | |
475 | insn->off -= insn - tmp_insns; \ | |
476 | } while (0) | |
477 | ||
f8f6d679 DB |
478 | case BPF_JMP | BPF_JA: |
479 | target = i + fp->k + 1; | |
480 | insn->code = fp->code; | |
481 | BPF_EMIT_JMP; | |
bd4cf0ed AS |
482 | break; |
483 | ||
484 | case BPF_JMP | BPF_JEQ | BPF_K: | |
485 | case BPF_JMP | BPF_JEQ | BPF_X: | |
486 | case BPF_JMP | BPF_JSET | BPF_K: | |
487 | case BPF_JMP | BPF_JSET | BPF_X: | |
488 | case BPF_JMP | BPF_JGT | BPF_K: | |
489 | case BPF_JMP | BPF_JGT | BPF_X: | |
490 | case BPF_JMP | BPF_JGE | BPF_K: | |
491 | case BPF_JMP | BPF_JGE | BPF_X: | |
492 | if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) { | |
493 | /* BPF immediates are signed, zero extend | |
494 | * immediate into tmp register and use it | |
495 | * in compare insn. | |
496 | */ | |
f8f6d679 | 497 | *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k); |
bd4cf0ed | 498 | |
e430f34e AS |
499 | insn->dst_reg = BPF_REG_A; |
500 | insn->src_reg = BPF_REG_TMP; | |
bd4cf0ed AS |
501 | bpf_src = BPF_X; |
502 | } else { | |
e430f34e | 503 | insn->dst_reg = BPF_REG_A; |
bd4cf0ed AS |
504 | insn->imm = fp->k; |
505 | bpf_src = BPF_SRC(fp->code); | |
19539ce7 | 506 | insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0; |
1da177e4 | 507 | } |
bd4cf0ed AS |
508 | |
509 | /* Common case where 'jump_false' is next insn. */ | |
510 | if (fp->jf == 0) { | |
511 | insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; | |
512 | target = i + fp->jt + 1; | |
f8f6d679 | 513 | BPF_EMIT_JMP; |
bd4cf0ed | 514 | break; |
1da177e4 | 515 | } |
bd4cf0ed | 516 | |
92b31a9a DB |
517 | /* Convert some jumps when 'jump_true' is next insn. */ |
518 | if (fp->jt == 0) { | |
519 | switch (BPF_OP(fp->code)) { | |
520 | case BPF_JEQ: | |
521 | insn->code = BPF_JMP | BPF_JNE | bpf_src; | |
522 | break; | |
523 | case BPF_JGT: | |
524 | insn->code = BPF_JMP | BPF_JLE | bpf_src; | |
525 | break; | |
526 | case BPF_JGE: | |
527 | insn->code = BPF_JMP | BPF_JLT | bpf_src; | |
528 | break; | |
529 | default: | |
530 | goto jmp_rest; | |
531 | } | |
532 | ||
bd4cf0ed | 533 | target = i + fp->jf + 1; |
f8f6d679 | 534 | BPF_EMIT_JMP; |
bd4cf0ed | 535 | break; |
0b05b2a4 | 536 | } |
92b31a9a | 537 | jmp_rest: |
bd4cf0ed AS |
538 | /* Other jumps are mapped into two insns: Jxx and JA. */ |
539 | target = i + fp->jt + 1; | |
540 | insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; | |
f8f6d679 | 541 | BPF_EMIT_JMP; |
bd4cf0ed AS |
542 | insn++; |
543 | ||
544 | insn->code = BPF_JMP | BPF_JA; | |
545 | target = i + fp->jf + 1; | |
f8f6d679 | 546 | BPF_EMIT_JMP; |
bd4cf0ed AS |
547 | break; |
548 | ||
549 | /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */ | |
550 | case BPF_LDX | BPF_MSH | BPF_B: | |
9739eef1 | 551 | /* tmp = A */ |
f8f6d679 | 552 | *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_A); |
1268e253 | 553 | /* A = BPF_R0 = *(u8 *) (skb->data + K) */ |
f8f6d679 | 554 | *insn++ = BPF_LD_ABS(BPF_B, fp->k); |
9739eef1 | 555 | /* A &= 0xf */ |
f8f6d679 | 556 | *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf); |
9739eef1 | 557 | /* A <<= 2 */ |
f8f6d679 | 558 | *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2); |
9739eef1 | 559 | /* X = A */ |
f8f6d679 | 560 | *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
9739eef1 | 561 | /* A = tmp */ |
f8f6d679 | 562 | *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP); |
bd4cf0ed AS |
563 | break; |
564 | ||
6205b9cf DB |
565 | /* RET_K is remaped into 2 insns. RET_A case doesn't need an |
566 | * extra mov as BPF_REG_0 is already mapped into BPF_REG_A. | |
567 | */ | |
bd4cf0ed AS |
568 | case BPF_RET | BPF_A: |
569 | case BPF_RET | BPF_K: | |
6205b9cf DB |
570 | if (BPF_RVAL(fp->code) == BPF_K) |
571 | *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0, | |
572 | 0, fp->k); | |
9739eef1 | 573 | *insn = BPF_EXIT_INSN(); |
bd4cf0ed AS |
574 | break; |
575 | ||
576 | /* Store to stack. */ | |
577 | case BPF_ST: | |
578 | case BPF_STX: | |
50bbfed9 | 579 | stack_off = fp->k * 4 + 4; |
f8f6d679 DB |
580 | *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) == |
581 | BPF_ST ? BPF_REG_A : BPF_REG_X, | |
50bbfed9 AS |
582 | -stack_off); |
583 | /* check_load_and_stores() verifies that classic BPF can | |
584 | * load from stack only after write, so tracking | |
585 | * stack_depth for ST|STX insns is enough | |
586 | */ | |
587 | if (new_prog && new_prog->aux->stack_depth < stack_off) | |
588 | new_prog->aux->stack_depth = stack_off; | |
bd4cf0ed AS |
589 | break; |
590 | ||
591 | /* Load from stack. */ | |
592 | case BPF_LD | BPF_MEM: | |
593 | case BPF_LDX | BPF_MEM: | |
50bbfed9 | 594 | stack_off = fp->k * 4 + 4; |
f8f6d679 DB |
595 | *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? |
596 | BPF_REG_A : BPF_REG_X, BPF_REG_FP, | |
50bbfed9 | 597 | -stack_off); |
bd4cf0ed AS |
598 | break; |
599 | ||
600 | /* A = K or X = K */ | |
601 | case BPF_LD | BPF_IMM: | |
602 | case BPF_LDX | BPF_IMM: | |
f8f6d679 DB |
603 | *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ? |
604 | BPF_REG_A : BPF_REG_X, fp->k); | |
bd4cf0ed AS |
605 | break; |
606 | ||
607 | /* X = A */ | |
608 | case BPF_MISC | BPF_TAX: | |
f8f6d679 | 609 | *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
bd4cf0ed AS |
610 | break; |
611 | ||
612 | /* A = X */ | |
613 | case BPF_MISC | BPF_TXA: | |
f8f6d679 | 614 | *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X); |
bd4cf0ed AS |
615 | break; |
616 | ||
617 | /* A = skb->len or X = skb->len */ | |
618 | case BPF_LD | BPF_W | BPF_LEN: | |
619 | case BPF_LDX | BPF_W | BPF_LEN: | |
f8f6d679 DB |
620 | *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? |
621 | BPF_REG_A : BPF_REG_X, BPF_REG_CTX, | |
622 | offsetof(struct sk_buff, len)); | |
bd4cf0ed AS |
623 | break; |
624 | ||
f8f6d679 | 625 | /* Access seccomp_data fields. */ |
bd4cf0ed | 626 | case BPF_LDX | BPF_ABS | BPF_W: |
9739eef1 AS |
627 | /* A = *(u32 *) (ctx + K) */ |
628 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); | |
bd4cf0ed AS |
629 | break; |
630 | ||
ca9f1fd2 | 631 | /* Unknown instruction. */ |
1da177e4 | 632 | default: |
bd4cf0ed | 633 | goto err; |
1da177e4 | 634 | } |
bd4cf0ed AS |
635 | |
636 | insn++; | |
637 | if (new_prog) | |
638 | memcpy(new_insn, tmp_insns, | |
639 | sizeof(*insn) * (insn - tmp_insns)); | |
bd4cf0ed | 640 | new_insn += insn - tmp_insns; |
1da177e4 LT |
641 | } |
642 | ||
bd4cf0ed AS |
643 | if (!new_prog) { |
644 | /* Only calculating new length. */ | |
50bbfed9 | 645 | *new_len = new_insn - first_insn; |
bd4cf0ed AS |
646 | return 0; |
647 | } | |
648 | ||
649 | pass++; | |
50bbfed9 AS |
650 | if (new_flen != new_insn - first_insn) { |
651 | new_flen = new_insn - first_insn; | |
bd4cf0ed AS |
652 | if (pass > 2) |
653 | goto err; | |
bd4cf0ed AS |
654 | goto do_pass; |
655 | } | |
656 | ||
657 | kfree(addrs); | |
658 | BUG_ON(*new_len != new_flen); | |
1da177e4 | 659 | return 0; |
bd4cf0ed AS |
660 | err: |
661 | kfree(addrs); | |
662 | return -EINVAL; | |
1da177e4 LT |
663 | } |
664 | ||
bd4cf0ed | 665 | /* Security: |
bd4cf0ed | 666 | * |
2d5311e4 | 667 | * As we dont want to clear mem[] array for each packet going through |
8ea6e345 | 668 | * __bpf_prog_run(), we check that filter loaded by user never try to read |
2d5311e4 | 669 | * a cell if not previously written, and we check all branches to be sure |
25985edc | 670 | * a malicious user doesn't try to abuse us. |
2d5311e4 | 671 | */ |
ec31a05c | 672 | static int check_load_and_stores(const struct sock_filter *filter, int flen) |
2d5311e4 | 673 | { |
34805931 | 674 | u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ |
2d5311e4 ED |
675 | int pc, ret = 0; |
676 | ||
677 | BUILD_BUG_ON(BPF_MEMWORDS > 16); | |
34805931 | 678 | |
99e72a0f | 679 | masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL); |
2d5311e4 ED |
680 | if (!masks) |
681 | return -ENOMEM; | |
34805931 | 682 | |
2d5311e4 ED |
683 | memset(masks, 0xff, flen * sizeof(*masks)); |
684 | ||
685 | for (pc = 0; pc < flen; pc++) { | |
686 | memvalid &= masks[pc]; | |
687 | ||
688 | switch (filter[pc].code) { | |
34805931 DB |
689 | case BPF_ST: |
690 | case BPF_STX: | |
2d5311e4 ED |
691 | memvalid |= (1 << filter[pc].k); |
692 | break; | |
34805931 DB |
693 | case BPF_LD | BPF_MEM: |
694 | case BPF_LDX | BPF_MEM: | |
2d5311e4 ED |
695 | if (!(memvalid & (1 << filter[pc].k))) { |
696 | ret = -EINVAL; | |
697 | goto error; | |
698 | } | |
699 | break; | |
34805931 DB |
700 | case BPF_JMP | BPF_JA: |
701 | /* A jump must set masks on target */ | |
2d5311e4 ED |
702 | masks[pc + 1 + filter[pc].k] &= memvalid; |
703 | memvalid = ~0; | |
704 | break; | |
34805931 DB |
705 | case BPF_JMP | BPF_JEQ | BPF_K: |
706 | case BPF_JMP | BPF_JEQ | BPF_X: | |
707 | case BPF_JMP | BPF_JGE | BPF_K: | |
708 | case BPF_JMP | BPF_JGE | BPF_X: | |
709 | case BPF_JMP | BPF_JGT | BPF_K: | |
710 | case BPF_JMP | BPF_JGT | BPF_X: | |
711 | case BPF_JMP | BPF_JSET | BPF_K: | |
712 | case BPF_JMP | BPF_JSET | BPF_X: | |
713 | /* A jump must set masks on targets */ | |
2d5311e4 ED |
714 | masks[pc + 1 + filter[pc].jt] &= memvalid; |
715 | masks[pc + 1 + filter[pc].jf] &= memvalid; | |
716 | memvalid = ~0; | |
717 | break; | |
718 | } | |
719 | } | |
720 | error: | |
721 | kfree(masks); | |
722 | return ret; | |
723 | } | |
724 | ||
34805931 DB |
725 | static bool chk_code_allowed(u16 code_to_probe) |
726 | { | |
727 | static const bool codes[] = { | |
728 | /* 32 bit ALU operations */ | |
729 | [BPF_ALU | BPF_ADD | BPF_K] = true, | |
730 | [BPF_ALU | BPF_ADD | BPF_X] = true, | |
731 | [BPF_ALU | BPF_SUB | BPF_K] = true, | |
732 | [BPF_ALU | BPF_SUB | BPF_X] = true, | |
733 | [BPF_ALU | BPF_MUL | BPF_K] = true, | |
734 | [BPF_ALU | BPF_MUL | BPF_X] = true, | |
735 | [BPF_ALU | BPF_DIV | BPF_K] = true, | |
736 | [BPF_ALU | BPF_DIV | BPF_X] = true, | |
737 | [BPF_ALU | BPF_MOD | BPF_K] = true, | |
738 | [BPF_ALU | BPF_MOD | BPF_X] = true, | |
739 | [BPF_ALU | BPF_AND | BPF_K] = true, | |
740 | [BPF_ALU | BPF_AND | BPF_X] = true, | |
741 | [BPF_ALU | BPF_OR | BPF_K] = true, | |
742 | [BPF_ALU | BPF_OR | BPF_X] = true, | |
743 | [BPF_ALU | BPF_XOR | BPF_K] = true, | |
744 | [BPF_ALU | BPF_XOR | BPF_X] = true, | |
745 | [BPF_ALU | BPF_LSH | BPF_K] = true, | |
746 | [BPF_ALU | BPF_LSH | BPF_X] = true, | |
747 | [BPF_ALU | BPF_RSH | BPF_K] = true, | |
748 | [BPF_ALU | BPF_RSH | BPF_X] = true, | |
749 | [BPF_ALU | BPF_NEG] = true, | |
750 | /* Load instructions */ | |
751 | [BPF_LD | BPF_W | BPF_ABS] = true, | |
752 | [BPF_LD | BPF_H | BPF_ABS] = true, | |
753 | [BPF_LD | BPF_B | BPF_ABS] = true, | |
754 | [BPF_LD | BPF_W | BPF_LEN] = true, | |
755 | [BPF_LD | BPF_W | BPF_IND] = true, | |
756 | [BPF_LD | BPF_H | BPF_IND] = true, | |
757 | [BPF_LD | BPF_B | BPF_IND] = true, | |
758 | [BPF_LD | BPF_IMM] = true, | |
759 | [BPF_LD | BPF_MEM] = true, | |
760 | [BPF_LDX | BPF_W | BPF_LEN] = true, | |
761 | [BPF_LDX | BPF_B | BPF_MSH] = true, | |
762 | [BPF_LDX | BPF_IMM] = true, | |
763 | [BPF_LDX | BPF_MEM] = true, | |
764 | /* Store instructions */ | |
765 | [BPF_ST] = true, | |
766 | [BPF_STX] = true, | |
767 | /* Misc instructions */ | |
768 | [BPF_MISC | BPF_TAX] = true, | |
769 | [BPF_MISC | BPF_TXA] = true, | |
770 | /* Return instructions */ | |
771 | [BPF_RET | BPF_K] = true, | |
772 | [BPF_RET | BPF_A] = true, | |
773 | /* Jump instructions */ | |
774 | [BPF_JMP | BPF_JA] = true, | |
775 | [BPF_JMP | BPF_JEQ | BPF_K] = true, | |
776 | [BPF_JMP | BPF_JEQ | BPF_X] = true, | |
777 | [BPF_JMP | BPF_JGE | BPF_K] = true, | |
778 | [BPF_JMP | BPF_JGE | BPF_X] = true, | |
779 | [BPF_JMP | BPF_JGT | BPF_K] = true, | |
780 | [BPF_JMP | BPF_JGT | BPF_X] = true, | |
781 | [BPF_JMP | BPF_JSET | BPF_K] = true, | |
782 | [BPF_JMP | BPF_JSET | BPF_X] = true, | |
783 | }; | |
784 | ||
785 | if (code_to_probe >= ARRAY_SIZE(codes)) | |
786 | return false; | |
787 | ||
788 | return codes[code_to_probe]; | |
789 | } | |
790 | ||
f7bd9e36 DB |
791 | static bool bpf_check_basics_ok(const struct sock_filter *filter, |
792 | unsigned int flen) | |
793 | { | |
794 | if (filter == NULL) | |
795 | return false; | |
796 | if (flen == 0 || flen > BPF_MAXINSNS) | |
797 | return false; | |
798 | ||
799 | return true; | |
800 | } | |
801 | ||
1da177e4 | 802 | /** |
4df95ff4 | 803 | * bpf_check_classic - verify socket filter code |
1da177e4 LT |
804 | * @filter: filter to verify |
805 | * @flen: length of filter | |
806 | * | |
807 | * Check the user's filter code. If we let some ugly | |
808 | * filter code slip through kaboom! The filter must contain | |
93699863 KK |
809 | * no references or jumps that are out of range, no illegal |
810 | * instructions, and must end with a RET instruction. | |
1da177e4 | 811 | * |
7b11f69f KK |
812 | * All jumps are forward as they are not signed. |
813 | * | |
814 | * Returns 0 if the rule set is legal or -EINVAL if not. | |
1da177e4 | 815 | */ |
d9e12f42 NS |
816 | static int bpf_check_classic(const struct sock_filter *filter, |
817 | unsigned int flen) | |
1da177e4 | 818 | { |
aa1113d9 | 819 | bool anc_found; |
34805931 | 820 | int pc; |
1da177e4 | 821 | |
34805931 | 822 | /* Check the filter code now */ |
1da177e4 | 823 | for (pc = 0; pc < flen; pc++) { |
ec31a05c | 824 | const struct sock_filter *ftest = &filter[pc]; |
93699863 | 825 | |
34805931 DB |
826 | /* May we actually operate on this code? */ |
827 | if (!chk_code_allowed(ftest->code)) | |
cba328fc | 828 | return -EINVAL; |
34805931 | 829 | |
93699863 | 830 | /* Some instructions need special checks */ |
34805931 DB |
831 | switch (ftest->code) { |
832 | case BPF_ALU | BPF_DIV | BPF_K: | |
833 | case BPF_ALU | BPF_MOD | BPF_K: | |
834 | /* Check for division by zero */ | |
b6069a95 ED |
835 | if (ftest->k == 0) |
836 | return -EINVAL; | |
837 | break; | |
229394e8 RV |
838 | case BPF_ALU | BPF_LSH | BPF_K: |
839 | case BPF_ALU | BPF_RSH | BPF_K: | |
840 | if (ftest->k >= 32) | |
841 | return -EINVAL; | |
842 | break; | |
34805931 DB |
843 | case BPF_LD | BPF_MEM: |
844 | case BPF_LDX | BPF_MEM: | |
845 | case BPF_ST: | |
846 | case BPF_STX: | |
847 | /* Check for invalid memory addresses */ | |
93699863 KK |
848 | if (ftest->k >= BPF_MEMWORDS) |
849 | return -EINVAL; | |
850 | break; | |
34805931 DB |
851 | case BPF_JMP | BPF_JA: |
852 | /* Note, the large ftest->k might cause loops. | |
93699863 KK |
853 | * Compare this with conditional jumps below, |
854 | * where offsets are limited. --ANK (981016) | |
855 | */ | |
34805931 | 856 | if (ftest->k >= (unsigned int)(flen - pc - 1)) |
93699863 | 857 | return -EINVAL; |
01f2f3f6 | 858 | break; |
34805931 DB |
859 | case BPF_JMP | BPF_JEQ | BPF_K: |
860 | case BPF_JMP | BPF_JEQ | BPF_X: | |
861 | case BPF_JMP | BPF_JGE | BPF_K: | |
862 | case BPF_JMP | BPF_JGE | BPF_X: | |
863 | case BPF_JMP | BPF_JGT | BPF_K: | |
864 | case BPF_JMP | BPF_JGT | BPF_X: | |
865 | case BPF_JMP | BPF_JSET | BPF_K: | |
866 | case BPF_JMP | BPF_JSET | BPF_X: | |
867 | /* Both conditionals must be safe */ | |
e35bedf3 | 868 | if (pc + ftest->jt + 1 >= flen || |
93699863 KK |
869 | pc + ftest->jf + 1 >= flen) |
870 | return -EINVAL; | |
cba328fc | 871 | break; |
34805931 DB |
872 | case BPF_LD | BPF_W | BPF_ABS: |
873 | case BPF_LD | BPF_H | BPF_ABS: | |
874 | case BPF_LD | BPF_B | BPF_ABS: | |
aa1113d9 | 875 | anc_found = false; |
34805931 DB |
876 | if (bpf_anc_helper(ftest) & BPF_ANC) |
877 | anc_found = true; | |
878 | /* Ancillary operation unknown or unsupported */ | |
aa1113d9 DB |
879 | if (anc_found == false && ftest->k >= SKF_AD_OFF) |
880 | return -EINVAL; | |
01f2f3f6 HPP |
881 | } |
882 | } | |
93699863 | 883 | |
34805931 | 884 | /* Last instruction must be a RET code */ |
01f2f3f6 | 885 | switch (filter[flen - 1].code) { |
34805931 DB |
886 | case BPF_RET | BPF_K: |
887 | case BPF_RET | BPF_A: | |
2d5311e4 | 888 | return check_load_and_stores(filter, flen); |
cba328fc | 889 | } |
34805931 | 890 | |
cba328fc | 891 | return -EINVAL; |
1da177e4 LT |
892 | } |
893 | ||
7ae457c1 AS |
894 | static int bpf_prog_store_orig_filter(struct bpf_prog *fp, |
895 | const struct sock_fprog *fprog) | |
a3ea269b | 896 | { |
009937e7 | 897 | unsigned int fsize = bpf_classic_proglen(fprog); |
a3ea269b DB |
898 | struct sock_fprog_kern *fkprog; |
899 | ||
900 | fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL); | |
901 | if (!fp->orig_prog) | |
902 | return -ENOMEM; | |
903 | ||
904 | fkprog = fp->orig_prog; | |
905 | fkprog->len = fprog->len; | |
658da937 DB |
906 | |
907 | fkprog->filter = kmemdup(fp->insns, fsize, | |
908 | GFP_KERNEL | __GFP_NOWARN); | |
a3ea269b DB |
909 | if (!fkprog->filter) { |
910 | kfree(fp->orig_prog); | |
911 | return -ENOMEM; | |
912 | } | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
7ae457c1 | 917 | static void bpf_release_orig_filter(struct bpf_prog *fp) |
a3ea269b DB |
918 | { |
919 | struct sock_fprog_kern *fprog = fp->orig_prog; | |
920 | ||
921 | if (fprog) { | |
922 | kfree(fprog->filter); | |
923 | kfree(fprog); | |
924 | } | |
925 | } | |
926 | ||
7ae457c1 AS |
927 | static void __bpf_prog_release(struct bpf_prog *prog) |
928 | { | |
24701ece | 929 | if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) { |
89aa0758 AS |
930 | bpf_prog_put(prog); |
931 | } else { | |
932 | bpf_release_orig_filter(prog); | |
933 | bpf_prog_free(prog); | |
934 | } | |
7ae457c1 AS |
935 | } |
936 | ||
34c5bd66 PN |
937 | static void __sk_filter_release(struct sk_filter *fp) |
938 | { | |
7ae457c1 AS |
939 | __bpf_prog_release(fp->prog); |
940 | kfree(fp); | |
34c5bd66 PN |
941 | } |
942 | ||
47e958ea | 943 | /** |
46bcf14f | 944 | * sk_filter_release_rcu - Release a socket filter by rcu_head |
47e958ea PE |
945 | * @rcu: rcu_head that contains the sk_filter to free |
946 | */ | |
fbc907f0 | 947 | static void sk_filter_release_rcu(struct rcu_head *rcu) |
47e958ea PE |
948 | { |
949 | struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); | |
950 | ||
34c5bd66 | 951 | __sk_filter_release(fp); |
47e958ea | 952 | } |
fbc907f0 DB |
953 | |
954 | /** | |
955 | * sk_filter_release - release a socket filter | |
956 | * @fp: filter to remove | |
957 | * | |
958 | * Remove a filter from a socket and release its resources. | |
959 | */ | |
960 | static void sk_filter_release(struct sk_filter *fp) | |
961 | { | |
4c355cdf | 962 | if (refcount_dec_and_test(&fp->refcnt)) |
fbc907f0 DB |
963 | call_rcu(&fp->rcu, sk_filter_release_rcu); |
964 | } | |
965 | ||
966 | void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) | |
967 | { | |
7ae457c1 | 968 | u32 filter_size = bpf_prog_size(fp->prog->len); |
fbc907f0 | 969 | |
278571ba AS |
970 | atomic_sub(filter_size, &sk->sk_omem_alloc); |
971 | sk_filter_release(fp); | |
fbc907f0 | 972 | } |
47e958ea | 973 | |
278571ba AS |
974 | /* try to charge the socket memory if there is space available |
975 | * return true on success | |
976 | */ | |
4c355cdf | 977 | static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
bd4cf0ed | 978 | { |
7ae457c1 | 979 | u32 filter_size = bpf_prog_size(fp->prog->len); |
278571ba AS |
980 | |
981 | /* same check as in sock_kmalloc() */ | |
982 | if (filter_size <= sysctl_optmem_max && | |
983 | atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) { | |
278571ba AS |
984 | atomic_add(filter_size, &sk->sk_omem_alloc); |
985 | return true; | |
bd4cf0ed | 986 | } |
278571ba | 987 | return false; |
bd4cf0ed AS |
988 | } |
989 | ||
4c355cdf RE |
990 | bool sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
991 | { | |
992 | bool ret = __sk_filter_charge(sk, fp); | |
993 | if (ret) | |
994 | refcount_inc(&fp->refcnt); | |
995 | return ret; | |
996 | } | |
997 | ||
7ae457c1 | 998 | static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp) |
bd4cf0ed AS |
999 | { |
1000 | struct sock_filter *old_prog; | |
7ae457c1 | 1001 | struct bpf_prog *old_fp; |
34805931 | 1002 | int err, new_len, old_len = fp->len; |
bd4cf0ed AS |
1003 | |
1004 | /* We are free to overwrite insns et al right here as it | |
1005 | * won't be used at this point in time anymore internally | |
1006 | * after the migration to the internal BPF instruction | |
1007 | * representation. | |
1008 | */ | |
1009 | BUILD_BUG_ON(sizeof(struct sock_filter) != | |
2695fb55 | 1010 | sizeof(struct bpf_insn)); |
bd4cf0ed | 1011 | |
bd4cf0ed AS |
1012 | /* Conversion cannot happen on overlapping memory areas, |
1013 | * so we need to keep the user BPF around until the 2nd | |
1014 | * pass. At this time, the user BPF is stored in fp->insns. | |
1015 | */ | |
1016 | old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter), | |
658da937 | 1017 | GFP_KERNEL | __GFP_NOWARN); |
bd4cf0ed AS |
1018 | if (!old_prog) { |
1019 | err = -ENOMEM; | |
1020 | goto out_err; | |
1021 | } | |
1022 | ||
1023 | /* 1st pass: calculate the new program length. */ | |
8fb575ca | 1024 | err = bpf_convert_filter(old_prog, old_len, NULL, &new_len); |
bd4cf0ed AS |
1025 | if (err) |
1026 | goto out_err_free; | |
1027 | ||
1028 | /* Expand fp for appending the new filter representation. */ | |
1029 | old_fp = fp; | |
60a3b225 | 1030 | fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0); |
bd4cf0ed AS |
1031 | if (!fp) { |
1032 | /* The old_fp is still around in case we couldn't | |
1033 | * allocate new memory, so uncharge on that one. | |
1034 | */ | |
1035 | fp = old_fp; | |
1036 | err = -ENOMEM; | |
1037 | goto out_err_free; | |
1038 | } | |
1039 | ||
bd4cf0ed AS |
1040 | fp->len = new_len; |
1041 | ||
2695fb55 | 1042 | /* 2nd pass: remap sock_filter insns into bpf_insn insns. */ |
50bbfed9 | 1043 | err = bpf_convert_filter(old_prog, old_len, fp, &new_len); |
bd4cf0ed | 1044 | if (err) |
8fb575ca | 1045 | /* 2nd bpf_convert_filter() can fail only if it fails |
bd4cf0ed AS |
1046 | * to allocate memory, remapping must succeed. Note, |
1047 | * that at this time old_fp has already been released | |
278571ba | 1048 | * by krealloc(). |
bd4cf0ed AS |
1049 | */ |
1050 | goto out_err_free; | |
1051 | ||
d1c55ab5 DB |
1052 | /* We are guaranteed to never error here with cBPF to eBPF |
1053 | * transitions, since there's no issue with type compatibility | |
1054 | * checks on program arrays. | |
1055 | */ | |
1056 | fp = bpf_prog_select_runtime(fp, &err); | |
5fe821a9 | 1057 | |
bd4cf0ed AS |
1058 | kfree(old_prog); |
1059 | return fp; | |
1060 | ||
1061 | out_err_free: | |
1062 | kfree(old_prog); | |
1063 | out_err: | |
7ae457c1 | 1064 | __bpf_prog_release(fp); |
bd4cf0ed AS |
1065 | return ERR_PTR(err); |
1066 | } | |
1067 | ||
ac67eb2c DB |
1068 | static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp, |
1069 | bpf_aux_classic_check_t trans) | |
302d6637 JP |
1070 | { |
1071 | int err; | |
1072 | ||
bd4cf0ed | 1073 | fp->bpf_func = NULL; |
a91263d5 | 1074 | fp->jited = 0; |
302d6637 | 1075 | |
4df95ff4 | 1076 | err = bpf_check_classic(fp->insns, fp->len); |
418c96ac | 1077 | if (err) { |
7ae457c1 | 1078 | __bpf_prog_release(fp); |
bd4cf0ed | 1079 | return ERR_PTR(err); |
418c96ac | 1080 | } |
302d6637 | 1081 | |
4ae92bc7 NS |
1082 | /* There might be additional checks and transformations |
1083 | * needed on classic filters, f.e. in case of seccomp. | |
1084 | */ | |
1085 | if (trans) { | |
1086 | err = trans(fp->insns, fp->len); | |
1087 | if (err) { | |
1088 | __bpf_prog_release(fp); | |
1089 | return ERR_PTR(err); | |
1090 | } | |
1091 | } | |
1092 | ||
bd4cf0ed AS |
1093 | /* Probe if we can JIT compile the filter and if so, do |
1094 | * the compilation of the filter. | |
1095 | */ | |
302d6637 | 1096 | bpf_jit_compile(fp); |
bd4cf0ed AS |
1097 | |
1098 | /* JIT compiler couldn't process this filter, so do the | |
1099 | * internal BPF translation for the optimized interpreter. | |
1100 | */ | |
5fe821a9 | 1101 | if (!fp->jited) |
7ae457c1 | 1102 | fp = bpf_migrate_filter(fp); |
bd4cf0ed AS |
1103 | |
1104 | return fp; | |
302d6637 JP |
1105 | } |
1106 | ||
1107 | /** | |
7ae457c1 | 1108 | * bpf_prog_create - create an unattached filter |
c6c4b97c | 1109 | * @pfp: the unattached filter that is created |
677a9fd3 | 1110 | * @fprog: the filter program |
302d6637 | 1111 | * |
c6c4b97c | 1112 | * Create a filter independent of any socket. We first run some |
302d6637 JP |
1113 | * sanity checks on it to make sure it does not explode on us later. |
1114 | * If an error occurs or there is insufficient memory for the filter | |
1115 | * a negative errno code is returned. On success the return is zero. | |
1116 | */ | |
7ae457c1 | 1117 | int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog) |
302d6637 | 1118 | { |
009937e7 | 1119 | unsigned int fsize = bpf_classic_proglen(fprog); |
7ae457c1 | 1120 | struct bpf_prog *fp; |
302d6637 JP |
1121 | |
1122 | /* Make sure new filter is there and in the right amounts. */ | |
f7bd9e36 | 1123 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
302d6637 JP |
1124 | return -EINVAL; |
1125 | ||
60a3b225 | 1126 | fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
302d6637 JP |
1127 | if (!fp) |
1128 | return -ENOMEM; | |
a3ea269b | 1129 | |
302d6637 JP |
1130 | memcpy(fp->insns, fprog->filter, fsize); |
1131 | ||
302d6637 | 1132 | fp->len = fprog->len; |
a3ea269b DB |
1133 | /* Since unattached filters are not copied back to user |
1134 | * space through sk_get_filter(), we do not need to hold | |
1135 | * a copy here, and can spare us the work. | |
1136 | */ | |
1137 | fp->orig_prog = NULL; | |
302d6637 | 1138 | |
7ae457c1 | 1139 | /* bpf_prepare_filter() already takes care of freeing |
bd4cf0ed AS |
1140 | * memory in case something goes wrong. |
1141 | */ | |
4ae92bc7 | 1142 | fp = bpf_prepare_filter(fp, NULL); |
bd4cf0ed AS |
1143 | if (IS_ERR(fp)) |
1144 | return PTR_ERR(fp); | |
302d6637 JP |
1145 | |
1146 | *pfp = fp; | |
1147 | return 0; | |
302d6637 | 1148 | } |
7ae457c1 | 1149 | EXPORT_SYMBOL_GPL(bpf_prog_create); |
302d6637 | 1150 | |
ac67eb2c DB |
1151 | /** |
1152 | * bpf_prog_create_from_user - create an unattached filter from user buffer | |
1153 | * @pfp: the unattached filter that is created | |
1154 | * @fprog: the filter program | |
1155 | * @trans: post-classic verifier transformation handler | |
bab18991 | 1156 | * @save_orig: save classic BPF program |
ac67eb2c DB |
1157 | * |
1158 | * This function effectively does the same as bpf_prog_create(), only | |
1159 | * that it builds up its insns buffer from user space provided buffer. | |
1160 | * It also allows for passing a bpf_aux_classic_check_t handler. | |
1161 | */ | |
1162 | int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, | |
bab18991 | 1163 | bpf_aux_classic_check_t trans, bool save_orig) |
ac67eb2c DB |
1164 | { |
1165 | unsigned int fsize = bpf_classic_proglen(fprog); | |
1166 | struct bpf_prog *fp; | |
bab18991 | 1167 | int err; |
ac67eb2c DB |
1168 | |
1169 | /* Make sure new filter is there and in the right amounts. */ | |
f7bd9e36 | 1170 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
ac67eb2c DB |
1171 | return -EINVAL; |
1172 | ||
1173 | fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); | |
1174 | if (!fp) | |
1175 | return -ENOMEM; | |
1176 | ||
1177 | if (copy_from_user(fp->insns, fprog->filter, fsize)) { | |
1178 | __bpf_prog_free(fp); | |
1179 | return -EFAULT; | |
1180 | } | |
1181 | ||
1182 | fp->len = fprog->len; | |
ac67eb2c DB |
1183 | fp->orig_prog = NULL; |
1184 | ||
bab18991 DB |
1185 | if (save_orig) { |
1186 | err = bpf_prog_store_orig_filter(fp, fprog); | |
1187 | if (err) { | |
1188 | __bpf_prog_free(fp); | |
1189 | return -ENOMEM; | |
1190 | } | |
1191 | } | |
1192 | ||
ac67eb2c DB |
1193 | /* bpf_prepare_filter() already takes care of freeing |
1194 | * memory in case something goes wrong. | |
1195 | */ | |
1196 | fp = bpf_prepare_filter(fp, trans); | |
1197 | if (IS_ERR(fp)) | |
1198 | return PTR_ERR(fp); | |
1199 | ||
1200 | *pfp = fp; | |
1201 | return 0; | |
1202 | } | |
2ea273d7 | 1203 | EXPORT_SYMBOL_GPL(bpf_prog_create_from_user); |
ac67eb2c | 1204 | |
7ae457c1 | 1205 | void bpf_prog_destroy(struct bpf_prog *fp) |
302d6637 | 1206 | { |
7ae457c1 | 1207 | __bpf_prog_release(fp); |
302d6637 | 1208 | } |
7ae457c1 | 1209 | EXPORT_SYMBOL_GPL(bpf_prog_destroy); |
302d6637 | 1210 | |
8ced425e | 1211 | static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk) |
49b31e57 DB |
1212 | { |
1213 | struct sk_filter *fp, *old_fp; | |
1214 | ||
1215 | fp = kmalloc(sizeof(*fp), GFP_KERNEL); | |
1216 | if (!fp) | |
1217 | return -ENOMEM; | |
1218 | ||
1219 | fp->prog = prog; | |
49b31e57 | 1220 | |
4c355cdf | 1221 | if (!__sk_filter_charge(sk, fp)) { |
49b31e57 DB |
1222 | kfree(fp); |
1223 | return -ENOMEM; | |
1224 | } | |
4c355cdf | 1225 | refcount_set(&fp->refcnt, 1); |
49b31e57 | 1226 | |
8ced425e HFS |
1227 | old_fp = rcu_dereference_protected(sk->sk_filter, |
1228 | lockdep_sock_is_held(sk)); | |
49b31e57 | 1229 | rcu_assign_pointer(sk->sk_filter, fp); |
8ced425e | 1230 | |
49b31e57 DB |
1231 | if (old_fp) |
1232 | sk_filter_uncharge(sk, old_fp); | |
1233 | ||
1234 | return 0; | |
1235 | } | |
1236 | ||
538950a1 CG |
1237 | static int __reuseport_attach_prog(struct bpf_prog *prog, struct sock *sk) |
1238 | { | |
1239 | struct bpf_prog *old_prog; | |
1240 | int err; | |
1241 | ||
1242 | if (bpf_prog_size(prog->len) > sysctl_optmem_max) | |
1243 | return -ENOMEM; | |
1244 | ||
fa463497 | 1245 | if (sk_unhashed(sk) && sk->sk_reuseport) { |
538950a1 CG |
1246 | err = reuseport_alloc(sk); |
1247 | if (err) | |
1248 | return err; | |
1249 | } else if (!rcu_access_pointer(sk->sk_reuseport_cb)) { | |
1250 | /* The socket wasn't bound with SO_REUSEPORT */ | |
1251 | return -EINVAL; | |
1252 | } | |
1253 | ||
1254 | old_prog = reuseport_attach_prog(sk, prog); | |
1255 | if (old_prog) | |
1256 | bpf_prog_destroy(old_prog); | |
1257 | ||
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | static | |
1262 | struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk) | |
1da177e4 | 1263 | { |
009937e7 | 1264 | unsigned int fsize = bpf_classic_proglen(fprog); |
7ae457c1 | 1265 | struct bpf_prog *prog; |
1da177e4 LT |
1266 | int err; |
1267 | ||
d59577b6 | 1268 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
538950a1 | 1269 | return ERR_PTR(-EPERM); |
d59577b6 | 1270 | |
1da177e4 | 1271 | /* Make sure new filter is there and in the right amounts. */ |
f7bd9e36 | 1272 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
538950a1 | 1273 | return ERR_PTR(-EINVAL); |
1da177e4 | 1274 | |
f7bd9e36 | 1275 | prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
7ae457c1 | 1276 | if (!prog) |
538950a1 | 1277 | return ERR_PTR(-ENOMEM); |
a3ea269b | 1278 | |
7ae457c1 | 1279 | if (copy_from_user(prog->insns, fprog->filter, fsize)) { |
c0d1379a | 1280 | __bpf_prog_free(prog); |
538950a1 | 1281 | return ERR_PTR(-EFAULT); |
1da177e4 LT |
1282 | } |
1283 | ||
7ae457c1 | 1284 | prog->len = fprog->len; |
1da177e4 | 1285 | |
7ae457c1 | 1286 | err = bpf_prog_store_orig_filter(prog, fprog); |
a3ea269b | 1287 | if (err) { |
c0d1379a | 1288 | __bpf_prog_free(prog); |
538950a1 | 1289 | return ERR_PTR(-ENOMEM); |
a3ea269b DB |
1290 | } |
1291 | ||
7ae457c1 | 1292 | /* bpf_prepare_filter() already takes care of freeing |
bd4cf0ed AS |
1293 | * memory in case something goes wrong. |
1294 | */ | |
538950a1 CG |
1295 | return bpf_prepare_filter(prog, NULL); |
1296 | } | |
1297 | ||
1298 | /** | |
1299 | * sk_attach_filter - attach a socket filter | |
1300 | * @fprog: the filter program | |
1301 | * @sk: the socket to use | |
1302 | * | |
1303 | * Attach the user's filter code. We first run some sanity checks on | |
1304 | * it to make sure it does not explode on us later. If an error | |
1305 | * occurs or there is insufficient memory for the filter a negative | |
1306 | * errno code is returned. On success the return is zero. | |
1307 | */ | |
8ced425e | 1308 | int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) |
538950a1 CG |
1309 | { |
1310 | struct bpf_prog *prog = __get_filter(fprog, sk); | |
1311 | int err; | |
1312 | ||
7ae457c1 AS |
1313 | if (IS_ERR(prog)) |
1314 | return PTR_ERR(prog); | |
1315 | ||
8ced425e | 1316 | err = __sk_attach_prog(prog, sk); |
49b31e57 | 1317 | if (err < 0) { |
7ae457c1 | 1318 | __bpf_prog_release(prog); |
49b31e57 | 1319 | return err; |
278571ba AS |
1320 | } |
1321 | ||
d3904b73 | 1322 | return 0; |
1da177e4 | 1323 | } |
8ced425e | 1324 | EXPORT_SYMBOL_GPL(sk_attach_filter); |
1da177e4 | 1325 | |
538950a1 | 1326 | int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk) |
89aa0758 | 1327 | { |
538950a1 | 1328 | struct bpf_prog *prog = __get_filter(fprog, sk); |
49b31e57 | 1329 | int err; |
89aa0758 | 1330 | |
538950a1 CG |
1331 | if (IS_ERR(prog)) |
1332 | return PTR_ERR(prog); | |
1333 | ||
1334 | err = __reuseport_attach_prog(prog, sk); | |
1335 | if (err < 0) { | |
1336 | __bpf_prog_release(prog); | |
1337 | return err; | |
1338 | } | |
1339 | ||
1340 | return 0; | |
1341 | } | |
1342 | ||
1343 | static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk) | |
1344 | { | |
89aa0758 | 1345 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
538950a1 | 1346 | return ERR_PTR(-EPERM); |
89aa0758 | 1347 | |
113214be | 1348 | return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); |
538950a1 CG |
1349 | } |
1350 | ||
1351 | int sk_attach_bpf(u32 ufd, struct sock *sk) | |
1352 | { | |
1353 | struct bpf_prog *prog = __get_bpf(ufd, sk); | |
1354 | int err; | |
1355 | ||
1356 | if (IS_ERR(prog)) | |
1357 | return PTR_ERR(prog); | |
1358 | ||
8ced425e | 1359 | err = __sk_attach_prog(prog, sk); |
49b31e57 | 1360 | if (err < 0) { |
89aa0758 | 1361 | bpf_prog_put(prog); |
49b31e57 | 1362 | return err; |
89aa0758 AS |
1363 | } |
1364 | ||
89aa0758 AS |
1365 | return 0; |
1366 | } | |
1367 | ||
538950a1 CG |
1368 | int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk) |
1369 | { | |
1370 | struct bpf_prog *prog = __get_bpf(ufd, sk); | |
1371 | int err; | |
1372 | ||
1373 | if (IS_ERR(prog)) | |
1374 | return PTR_ERR(prog); | |
1375 | ||
1376 | err = __reuseport_attach_prog(prog, sk); | |
1377 | if (err < 0) { | |
1378 | bpf_prog_put(prog); | |
1379 | return err; | |
1380 | } | |
1381 | ||
1382 | return 0; | |
1383 | } | |
1384 | ||
21cafc1d DB |
1385 | struct bpf_scratchpad { |
1386 | union { | |
1387 | __be32 diff[MAX_BPF_STACK / sizeof(__be32)]; | |
1388 | u8 buff[MAX_BPF_STACK]; | |
1389 | }; | |
1390 | }; | |
1391 | ||
1392 | static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp); | |
91bc4822 | 1393 | |
5293efe6 DB |
1394 | static inline int __bpf_try_make_writable(struct sk_buff *skb, |
1395 | unsigned int write_len) | |
1396 | { | |
1397 | return skb_ensure_writable(skb, write_len); | |
1398 | } | |
1399 | ||
db58ba45 AS |
1400 | static inline int bpf_try_make_writable(struct sk_buff *skb, |
1401 | unsigned int write_len) | |
1402 | { | |
5293efe6 | 1403 | int err = __bpf_try_make_writable(skb, write_len); |
db58ba45 | 1404 | |
0ed661d5 | 1405 | bpf_compute_data_end(skb); |
db58ba45 AS |
1406 | return err; |
1407 | } | |
1408 | ||
36bbef52 DB |
1409 | static int bpf_try_make_head_writable(struct sk_buff *skb) |
1410 | { | |
1411 | return bpf_try_make_writable(skb, skb_headlen(skb)); | |
1412 | } | |
1413 | ||
a2bfe6bf DB |
1414 | static inline void bpf_push_mac_rcsum(struct sk_buff *skb) |
1415 | { | |
1416 | if (skb_at_tc_ingress(skb)) | |
1417 | skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len); | |
1418 | } | |
1419 | ||
8065694e DB |
1420 | static inline void bpf_pull_mac_rcsum(struct sk_buff *skb) |
1421 | { | |
1422 | if (skb_at_tc_ingress(skb)) | |
1423 | skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len); | |
1424 | } | |
1425 | ||
f3694e00 DB |
1426 | BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset, |
1427 | const void *, from, u32, len, u64, flags) | |
608cd71a | 1428 | { |
608cd71a AS |
1429 | void *ptr; |
1430 | ||
8afd54c8 | 1431 | if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH))) |
781c53bc | 1432 | return -EINVAL; |
0ed661d5 | 1433 | if (unlikely(offset > 0xffff)) |
608cd71a | 1434 | return -EFAULT; |
db58ba45 | 1435 | if (unlikely(bpf_try_make_writable(skb, offset + len))) |
608cd71a AS |
1436 | return -EFAULT; |
1437 | ||
0ed661d5 | 1438 | ptr = skb->data + offset; |
781c53bc | 1439 | if (flags & BPF_F_RECOMPUTE_CSUM) |
479ffccc | 1440 | __skb_postpull_rcsum(skb, ptr, len, offset); |
608cd71a AS |
1441 | |
1442 | memcpy(ptr, from, len); | |
1443 | ||
781c53bc | 1444 | if (flags & BPF_F_RECOMPUTE_CSUM) |
479ffccc | 1445 | __skb_postpush_rcsum(skb, ptr, len, offset); |
8afd54c8 DB |
1446 | if (flags & BPF_F_INVALIDATE_HASH) |
1447 | skb_clear_hash(skb); | |
f8ffad69 | 1448 | |
608cd71a AS |
1449 | return 0; |
1450 | } | |
1451 | ||
577c50aa | 1452 | static const struct bpf_func_proto bpf_skb_store_bytes_proto = { |
608cd71a AS |
1453 | .func = bpf_skb_store_bytes, |
1454 | .gpl_only = false, | |
1455 | .ret_type = RET_INTEGER, | |
1456 | .arg1_type = ARG_PTR_TO_CTX, | |
1457 | .arg2_type = ARG_ANYTHING, | |
39f19ebb AS |
1458 | .arg3_type = ARG_PTR_TO_MEM, |
1459 | .arg4_type = ARG_CONST_SIZE, | |
91bc4822 AS |
1460 | .arg5_type = ARG_ANYTHING, |
1461 | }; | |
1462 | ||
f3694e00 DB |
1463 | BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset, |
1464 | void *, to, u32, len) | |
05c74e5e | 1465 | { |
05c74e5e DB |
1466 | void *ptr; |
1467 | ||
0ed661d5 | 1468 | if (unlikely(offset > 0xffff)) |
074f528e | 1469 | goto err_clear; |
05c74e5e DB |
1470 | |
1471 | ptr = skb_header_pointer(skb, offset, len, to); | |
1472 | if (unlikely(!ptr)) | |
074f528e | 1473 | goto err_clear; |
05c74e5e DB |
1474 | if (ptr != to) |
1475 | memcpy(to, ptr, len); | |
1476 | ||
1477 | return 0; | |
074f528e DB |
1478 | err_clear: |
1479 | memset(to, 0, len); | |
1480 | return -EFAULT; | |
05c74e5e DB |
1481 | } |
1482 | ||
577c50aa | 1483 | static const struct bpf_func_proto bpf_skb_load_bytes_proto = { |
05c74e5e DB |
1484 | .func = bpf_skb_load_bytes, |
1485 | .gpl_only = false, | |
1486 | .ret_type = RET_INTEGER, | |
1487 | .arg1_type = ARG_PTR_TO_CTX, | |
1488 | .arg2_type = ARG_ANYTHING, | |
39f19ebb AS |
1489 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, |
1490 | .arg4_type = ARG_CONST_SIZE, | |
05c74e5e DB |
1491 | }; |
1492 | ||
36bbef52 DB |
1493 | BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) |
1494 | { | |
1495 | /* Idea is the following: should the needed direct read/write | |
1496 | * test fail during runtime, we can pull in more data and redo | |
1497 | * again, since implicitly, we invalidate previous checks here. | |
1498 | * | |
1499 | * Or, since we know how much we need to make read/writeable, | |
1500 | * this can be done once at the program beginning for direct | |
1501 | * access case. By this we overcome limitations of only current | |
1502 | * headroom being accessible. | |
1503 | */ | |
1504 | return bpf_try_make_writable(skb, len ? : skb_headlen(skb)); | |
1505 | } | |
1506 | ||
1507 | static const struct bpf_func_proto bpf_skb_pull_data_proto = { | |
1508 | .func = bpf_skb_pull_data, | |
1509 | .gpl_only = false, | |
1510 | .ret_type = RET_INTEGER, | |
1511 | .arg1_type = ARG_PTR_TO_CTX, | |
1512 | .arg2_type = ARG_ANYTHING, | |
1513 | }; | |
1514 | ||
f3694e00 DB |
1515 | BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset, |
1516 | u64, from, u64, to, u64, flags) | |
91bc4822 | 1517 | { |
0ed661d5 | 1518 | __sum16 *ptr; |
91bc4822 | 1519 | |
781c53bc DB |
1520 | if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK))) |
1521 | return -EINVAL; | |
0ed661d5 | 1522 | if (unlikely(offset > 0xffff || offset & 1)) |
91bc4822 | 1523 | return -EFAULT; |
0ed661d5 | 1524 | if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) |
91bc4822 AS |
1525 | return -EFAULT; |
1526 | ||
0ed661d5 | 1527 | ptr = (__sum16 *)(skb->data + offset); |
781c53bc | 1528 | switch (flags & BPF_F_HDR_FIELD_MASK) { |
8050c0f0 DB |
1529 | case 0: |
1530 | if (unlikely(from != 0)) | |
1531 | return -EINVAL; | |
1532 | ||
1533 | csum_replace_by_diff(ptr, to); | |
1534 | break; | |
91bc4822 AS |
1535 | case 2: |
1536 | csum_replace2(ptr, from, to); | |
1537 | break; | |
1538 | case 4: | |
1539 | csum_replace4(ptr, from, to); | |
1540 | break; | |
1541 | default: | |
1542 | return -EINVAL; | |
1543 | } | |
1544 | ||
91bc4822 AS |
1545 | return 0; |
1546 | } | |
1547 | ||
577c50aa | 1548 | static const struct bpf_func_proto bpf_l3_csum_replace_proto = { |
91bc4822 AS |
1549 | .func = bpf_l3_csum_replace, |
1550 | .gpl_only = false, | |
1551 | .ret_type = RET_INTEGER, | |
1552 | .arg1_type = ARG_PTR_TO_CTX, | |
1553 | .arg2_type = ARG_ANYTHING, | |
1554 | .arg3_type = ARG_ANYTHING, | |
1555 | .arg4_type = ARG_ANYTHING, | |
1556 | .arg5_type = ARG_ANYTHING, | |
1557 | }; | |
1558 | ||
f3694e00 DB |
1559 | BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, |
1560 | u64, from, u64, to, u64, flags) | |
91bc4822 | 1561 | { |
781c53bc | 1562 | bool is_pseudo = flags & BPF_F_PSEUDO_HDR; |
2f72959a | 1563 | bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; |
d1b662ad | 1564 | bool do_mforce = flags & BPF_F_MARK_ENFORCE; |
0ed661d5 | 1565 | __sum16 *ptr; |
91bc4822 | 1566 | |
d1b662ad DB |
1567 | if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | |
1568 | BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) | |
781c53bc | 1569 | return -EINVAL; |
0ed661d5 | 1570 | if (unlikely(offset > 0xffff || offset & 1)) |
91bc4822 | 1571 | return -EFAULT; |
0ed661d5 | 1572 | if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) |
91bc4822 AS |
1573 | return -EFAULT; |
1574 | ||
0ed661d5 | 1575 | ptr = (__sum16 *)(skb->data + offset); |
d1b662ad | 1576 | if (is_mmzero && !do_mforce && !*ptr) |
2f72959a | 1577 | return 0; |
91bc4822 | 1578 | |
781c53bc | 1579 | switch (flags & BPF_F_HDR_FIELD_MASK) { |
7d672345 DB |
1580 | case 0: |
1581 | if (unlikely(from != 0)) | |
1582 | return -EINVAL; | |
1583 | ||
1584 | inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo); | |
1585 | break; | |
91bc4822 AS |
1586 | case 2: |
1587 | inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); | |
1588 | break; | |
1589 | case 4: | |
1590 | inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo); | |
1591 | break; | |
1592 | default: | |
1593 | return -EINVAL; | |
1594 | } | |
1595 | ||
2f72959a DB |
1596 | if (is_mmzero && !*ptr) |
1597 | *ptr = CSUM_MANGLED_0; | |
91bc4822 AS |
1598 | return 0; |
1599 | } | |
1600 | ||
577c50aa | 1601 | static const struct bpf_func_proto bpf_l4_csum_replace_proto = { |
91bc4822 AS |
1602 | .func = bpf_l4_csum_replace, |
1603 | .gpl_only = false, | |
1604 | .ret_type = RET_INTEGER, | |
1605 | .arg1_type = ARG_PTR_TO_CTX, | |
1606 | .arg2_type = ARG_ANYTHING, | |
1607 | .arg3_type = ARG_ANYTHING, | |
1608 | .arg4_type = ARG_ANYTHING, | |
1609 | .arg5_type = ARG_ANYTHING, | |
608cd71a AS |
1610 | }; |
1611 | ||
f3694e00 DB |
1612 | BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, |
1613 | __be32 *, to, u32, to_size, __wsum, seed) | |
7d672345 | 1614 | { |
21cafc1d | 1615 | struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp); |
f3694e00 | 1616 | u32 diff_size = from_size + to_size; |
7d672345 DB |
1617 | int i, j = 0; |
1618 | ||
1619 | /* This is quite flexible, some examples: | |
1620 | * | |
1621 | * from_size == 0, to_size > 0, seed := csum --> pushing data | |
1622 | * from_size > 0, to_size == 0, seed := csum --> pulling data | |
1623 | * from_size > 0, to_size > 0, seed := 0 --> diffing data | |
1624 | * | |
1625 | * Even for diffing, from_size and to_size don't need to be equal. | |
1626 | */ | |
1627 | if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) || | |
1628 | diff_size > sizeof(sp->diff))) | |
1629 | return -EINVAL; | |
1630 | ||
1631 | for (i = 0; i < from_size / sizeof(__be32); i++, j++) | |
1632 | sp->diff[j] = ~from[i]; | |
1633 | for (i = 0; i < to_size / sizeof(__be32); i++, j++) | |
1634 | sp->diff[j] = to[i]; | |
1635 | ||
1636 | return csum_partial(sp->diff, diff_size, seed); | |
1637 | } | |
1638 | ||
577c50aa | 1639 | static const struct bpf_func_proto bpf_csum_diff_proto = { |
7d672345 DB |
1640 | .func = bpf_csum_diff, |
1641 | .gpl_only = false, | |
36bbef52 | 1642 | .pkt_access = true, |
7d672345 | 1643 | .ret_type = RET_INTEGER, |
39f19ebb AS |
1644 | .arg1_type = ARG_PTR_TO_MEM, |
1645 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
1646 | .arg3_type = ARG_PTR_TO_MEM, | |
1647 | .arg4_type = ARG_CONST_SIZE_OR_ZERO, | |
7d672345 DB |
1648 | .arg5_type = ARG_ANYTHING, |
1649 | }; | |
1650 | ||
36bbef52 DB |
1651 | BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum) |
1652 | { | |
1653 | /* The interface is to be used in combination with bpf_csum_diff() | |
1654 | * for direct packet writes. csum rotation for alignment as well | |
1655 | * as emulating csum_sub() can be done from the eBPF program. | |
1656 | */ | |
1657 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
1658 | return (skb->csum = csum_add(skb->csum, csum)); | |
1659 | ||
1660 | return -ENOTSUPP; | |
1661 | } | |
1662 | ||
1663 | static const struct bpf_func_proto bpf_csum_update_proto = { | |
1664 | .func = bpf_csum_update, | |
1665 | .gpl_only = false, | |
1666 | .ret_type = RET_INTEGER, | |
1667 | .arg1_type = ARG_PTR_TO_CTX, | |
1668 | .arg2_type = ARG_ANYTHING, | |
1669 | }; | |
1670 | ||
a70b506e DB |
1671 | static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb) |
1672 | { | |
a70b506e DB |
1673 | return dev_forward_skb(dev, skb); |
1674 | } | |
1675 | ||
4e3264d2 MKL |
1676 | static inline int __bpf_rx_skb_no_mac(struct net_device *dev, |
1677 | struct sk_buff *skb) | |
1678 | { | |
1679 | int ret = ____dev_forward_skb(dev, skb); | |
1680 | ||
1681 | if (likely(!ret)) { | |
1682 | skb->dev = dev; | |
1683 | ret = netif_rx(skb); | |
1684 | } | |
1685 | ||
1686 | return ret; | |
1687 | } | |
1688 | ||
a70b506e DB |
1689 | static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb) |
1690 | { | |
1691 | int ret; | |
1692 | ||
1693 | if (unlikely(__this_cpu_read(xmit_recursion) > XMIT_RECURSION_LIMIT)) { | |
1694 | net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); | |
1695 | kfree_skb(skb); | |
1696 | return -ENETDOWN; | |
1697 | } | |
1698 | ||
1699 | skb->dev = dev; | |
1700 | ||
1701 | __this_cpu_inc(xmit_recursion); | |
1702 | ret = dev_queue_xmit(skb); | |
1703 | __this_cpu_dec(xmit_recursion); | |
1704 | ||
1705 | return ret; | |
1706 | } | |
1707 | ||
4e3264d2 MKL |
1708 | static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, |
1709 | u32 flags) | |
1710 | { | |
1711 | /* skb->mac_len is not set on normal egress */ | |
1712 | unsigned int mlen = skb->network_header - skb->mac_header; | |
1713 | ||
1714 | __skb_pull(skb, mlen); | |
1715 | ||
1716 | /* At ingress, the mac header has already been pulled once. | |
1717 | * At egress, skb_pospull_rcsum has to be done in case that | |
1718 | * the skb is originated from ingress (i.e. a forwarded skb) | |
1719 | * to ensure that rcsum starts at net header. | |
1720 | */ | |
1721 | if (!skb_at_tc_ingress(skb)) | |
1722 | skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); | |
1723 | skb_pop_mac_header(skb); | |
1724 | skb_reset_mac_len(skb); | |
1725 | return flags & BPF_F_INGRESS ? | |
1726 | __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); | |
1727 | } | |
1728 | ||
1729 | static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, | |
1730 | u32 flags) | |
1731 | { | |
3a0af8fd TG |
1732 | /* Verify that a link layer header is carried */ |
1733 | if (unlikely(skb->mac_header >= skb->network_header)) { | |
1734 | kfree_skb(skb); | |
1735 | return -ERANGE; | |
1736 | } | |
1737 | ||
4e3264d2 MKL |
1738 | bpf_push_mac_rcsum(skb); |
1739 | return flags & BPF_F_INGRESS ? | |
1740 | __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); | |
1741 | } | |
1742 | ||
1743 | static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, | |
1744 | u32 flags) | |
1745 | { | |
c491680f | 1746 | if (dev_is_mac_header_xmit(dev)) |
4e3264d2 | 1747 | return __bpf_redirect_common(skb, dev, flags); |
c491680f DB |
1748 | else |
1749 | return __bpf_redirect_no_mac(skb, dev, flags); | |
4e3264d2 MKL |
1750 | } |
1751 | ||
f3694e00 | 1752 | BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) |
3896d655 | 1753 | { |
3896d655 | 1754 | struct net_device *dev; |
36bbef52 DB |
1755 | struct sk_buff *clone; |
1756 | int ret; | |
3896d655 | 1757 | |
781c53bc DB |
1758 | if (unlikely(flags & ~(BPF_F_INGRESS))) |
1759 | return -EINVAL; | |
1760 | ||
3896d655 AS |
1761 | dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); |
1762 | if (unlikely(!dev)) | |
1763 | return -EINVAL; | |
1764 | ||
36bbef52 DB |
1765 | clone = skb_clone(skb, GFP_ATOMIC); |
1766 | if (unlikely(!clone)) | |
3896d655 AS |
1767 | return -ENOMEM; |
1768 | ||
36bbef52 DB |
1769 | /* For direct write, we need to keep the invariant that the skbs |
1770 | * we're dealing with need to be uncloned. Should uncloning fail | |
1771 | * here, we need to free the just generated clone to unclone once | |
1772 | * again. | |
1773 | */ | |
1774 | ret = bpf_try_make_head_writable(skb); | |
1775 | if (unlikely(ret)) { | |
1776 | kfree_skb(clone); | |
1777 | return -ENOMEM; | |
1778 | } | |
1779 | ||
4e3264d2 | 1780 | return __bpf_redirect(clone, dev, flags); |
3896d655 AS |
1781 | } |
1782 | ||
577c50aa | 1783 | static const struct bpf_func_proto bpf_clone_redirect_proto = { |
3896d655 AS |
1784 | .func = bpf_clone_redirect, |
1785 | .gpl_only = false, | |
1786 | .ret_type = RET_INTEGER, | |
1787 | .arg1_type = ARG_PTR_TO_CTX, | |
1788 | .arg2_type = ARG_ANYTHING, | |
1789 | .arg3_type = ARG_ANYTHING, | |
1790 | }; | |
1791 | ||
27b29f63 AS |
1792 | struct redirect_info { |
1793 | u32 ifindex; | |
1794 | u32 flags; | |
97f91a7c | 1795 | struct bpf_map *map; |
11393cc9 | 1796 | struct bpf_map *map_to_flush; |
27b29f63 AS |
1797 | }; |
1798 | ||
1799 | static DEFINE_PER_CPU(struct redirect_info, redirect_info); | |
781c53bc | 1800 | |
f3694e00 | 1801 | BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) |
27b29f63 AS |
1802 | { |
1803 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
1804 | ||
781c53bc DB |
1805 | if (unlikely(flags & ~(BPF_F_INGRESS))) |
1806 | return TC_ACT_SHOT; | |
1807 | ||
27b29f63 AS |
1808 | ri->ifindex = ifindex; |
1809 | ri->flags = flags; | |
97f91a7c | 1810 | ri->map = NULL; |
781c53bc | 1811 | |
27b29f63 AS |
1812 | return TC_ACT_REDIRECT; |
1813 | } | |
1814 | ||
1815 | int skb_do_redirect(struct sk_buff *skb) | |
1816 | { | |
1817 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
1818 | struct net_device *dev; | |
1819 | ||
1820 | dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->ifindex); | |
1821 | ri->ifindex = 0; | |
1822 | if (unlikely(!dev)) { | |
1823 | kfree_skb(skb); | |
1824 | return -EINVAL; | |
1825 | } | |
1826 | ||
4e3264d2 | 1827 | return __bpf_redirect(skb, dev, ri->flags); |
27b29f63 AS |
1828 | } |
1829 | ||
577c50aa | 1830 | static const struct bpf_func_proto bpf_redirect_proto = { |
27b29f63 AS |
1831 | .func = bpf_redirect, |
1832 | .gpl_only = false, | |
1833 | .ret_type = RET_INTEGER, | |
1834 | .arg1_type = ARG_ANYTHING, | |
1835 | .arg2_type = ARG_ANYTHING, | |
1836 | }; | |
1837 | ||
174a79ff JF |
1838 | BPF_CALL_3(bpf_sk_redirect_map, struct bpf_map *, map, u32, key, u64, flags) |
1839 | { | |
1840 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
1841 | ||
1842 | if (unlikely(flags)) | |
1843 | return SK_ABORTED; | |
1844 | ||
1845 | ri->ifindex = key; | |
1846 | ri->flags = flags; | |
1847 | ri->map = map; | |
1848 | ||
1849 | return SK_REDIRECT; | |
1850 | } | |
1851 | ||
1852 | struct sock *do_sk_redirect_map(void) | |
1853 | { | |
1854 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
1855 | struct sock *sk = NULL; | |
1856 | ||
1857 | if (ri->map) { | |
1858 | sk = __sock_map_lookup_elem(ri->map, ri->ifindex); | |
1859 | ||
1860 | ri->ifindex = 0; | |
1861 | ri->map = NULL; | |
1862 | /* we do not clear flags for future lookup */ | |
1863 | } | |
1864 | ||
1865 | return sk; | |
1866 | } | |
1867 | ||
1868 | static const struct bpf_func_proto bpf_sk_redirect_map_proto = { | |
1869 | .func = bpf_sk_redirect_map, | |
1870 | .gpl_only = false, | |
1871 | .ret_type = RET_INTEGER, | |
1872 | .arg1_type = ARG_CONST_MAP_PTR, | |
1873 | .arg2_type = ARG_ANYTHING, | |
1874 | .arg3_type = ARG_ANYTHING, | |
1875 | }; | |
1876 | ||
f3694e00 | 1877 | BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) |
8d20aabe | 1878 | { |
f3694e00 | 1879 | return task_get_classid(skb); |
8d20aabe DB |
1880 | } |
1881 | ||
1882 | static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { | |
1883 | .func = bpf_get_cgroup_classid, | |
1884 | .gpl_only = false, | |
1885 | .ret_type = RET_INTEGER, | |
1886 | .arg1_type = ARG_PTR_TO_CTX, | |
1887 | }; | |
1888 | ||
f3694e00 | 1889 | BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) |
c46646d0 | 1890 | { |
f3694e00 | 1891 | return dst_tclassid(skb); |
c46646d0 DB |
1892 | } |
1893 | ||
1894 | static const struct bpf_func_proto bpf_get_route_realm_proto = { | |
1895 | .func = bpf_get_route_realm, | |
1896 | .gpl_only = false, | |
1897 | .ret_type = RET_INTEGER, | |
1898 | .arg1_type = ARG_PTR_TO_CTX, | |
1899 | }; | |
1900 | ||
f3694e00 | 1901 | BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) |
13c5c240 DB |
1902 | { |
1903 | /* If skb_clear_hash() was called due to mangling, we can | |
1904 | * trigger SW recalculation here. Later access to hash | |
1905 | * can then use the inline skb->hash via context directly | |
1906 | * instead of calling this helper again. | |
1907 | */ | |
f3694e00 | 1908 | return skb_get_hash(skb); |
13c5c240 DB |
1909 | } |
1910 | ||
1911 | static const struct bpf_func_proto bpf_get_hash_recalc_proto = { | |
1912 | .func = bpf_get_hash_recalc, | |
1913 | .gpl_only = false, | |
1914 | .ret_type = RET_INTEGER, | |
1915 | .arg1_type = ARG_PTR_TO_CTX, | |
1916 | }; | |
1917 | ||
7a4b28c6 DB |
1918 | BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) |
1919 | { | |
1920 | /* After all direct packet write, this can be used once for | |
1921 | * triggering a lazy recalc on next skb_get_hash() invocation. | |
1922 | */ | |
1923 | skb_clear_hash(skb); | |
1924 | return 0; | |
1925 | } | |
1926 | ||
1927 | static const struct bpf_func_proto bpf_set_hash_invalid_proto = { | |
1928 | .func = bpf_set_hash_invalid, | |
1929 | .gpl_only = false, | |
1930 | .ret_type = RET_INTEGER, | |
1931 | .arg1_type = ARG_PTR_TO_CTX, | |
1932 | }; | |
1933 | ||
ded092cd DB |
1934 | BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) |
1935 | { | |
1936 | /* Set user specified hash as L4(+), so that it gets returned | |
1937 | * on skb_get_hash() call unless BPF prog later on triggers a | |
1938 | * skb_clear_hash(). | |
1939 | */ | |
1940 | __skb_set_sw_hash(skb, hash, true); | |
1941 | return 0; | |
1942 | } | |
1943 | ||
1944 | static const struct bpf_func_proto bpf_set_hash_proto = { | |
1945 | .func = bpf_set_hash, | |
1946 | .gpl_only = false, | |
1947 | .ret_type = RET_INTEGER, | |
1948 | .arg1_type = ARG_PTR_TO_CTX, | |
1949 | .arg2_type = ARG_ANYTHING, | |
1950 | }; | |
1951 | ||
f3694e00 DB |
1952 | BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, |
1953 | u16, vlan_tci) | |
4e10df9a | 1954 | { |
db58ba45 | 1955 | int ret; |
4e10df9a AS |
1956 | |
1957 | if (unlikely(vlan_proto != htons(ETH_P_8021Q) && | |
1958 | vlan_proto != htons(ETH_P_8021AD))) | |
1959 | vlan_proto = htons(ETH_P_8021Q); | |
1960 | ||
8065694e | 1961 | bpf_push_mac_rcsum(skb); |
db58ba45 | 1962 | ret = skb_vlan_push(skb, vlan_proto, vlan_tci); |
8065694e DB |
1963 | bpf_pull_mac_rcsum(skb); |
1964 | ||
db58ba45 AS |
1965 | bpf_compute_data_end(skb); |
1966 | return ret; | |
4e10df9a AS |
1967 | } |
1968 | ||
1969 | const struct bpf_func_proto bpf_skb_vlan_push_proto = { | |
1970 | .func = bpf_skb_vlan_push, | |
1971 | .gpl_only = false, | |
1972 | .ret_type = RET_INTEGER, | |
1973 | .arg1_type = ARG_PTR_TO_CTX, | |
1974 | .arg2_type = ARG_ANYTHING, | |
1975 | .arg3_type = ARG_ANYTHING, | |
1976 | }; | |
4d9c5c53 | 1977 | EXPORT_SYMBOL_GPL(bpf_skb_vlan_push_proto); |
4e10df9a | 1978 | |
f3694e00 | 1979 | BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) |
4e10df9a | 1980 | { |
db58ba45 | 1981 | int ret; |
4e10df9a | 1982 | |
8065694e | 1983 | bpf_push_mac_rcsum(skb); |
db58ba45 | 1984 | ret = skb_vlan_pop(skb); |
8065694e DB |
1985 | bpf_pull_mac_rcsum(skb); |
1986 | ||
db58ba45 AS |
1987 | bpf_compute_data_end(skb); |
1988 | return ret; | |
4e10df9a AS |
1989 | } |
1990 | ||
1991 | const struct bpf_func_proto bpf_skb_vlan_pop_proto = { | |
1992 | .func = bpf_skb_vlan_pop, | |
1993 | .gpl_only = false, | |
1994 | .ret_type = RET_INTEGER, | |
1995 | .arg1_type = ARG_PTR_TO_CTX, | |
1996 | }; | |
4d9c5c53 | 1997 | EXPORT_SYMBOL_GPL(bpf_skb_vlan_pop_proto); |
4e10df9a | 1998 | |
6578171a DB |
1999 | static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) |
2000 | { | |
2001 | /* Caller already did skb_cow() with len as headroom, | |
2002 | * so no need to do it here. | |
2003 | */ | |
2004 | skb_push(skb, len); | |
2005 | memmove(skb->data, skb->data + len, off); | |
2006 | memset(skb->data + off, 0, len); | |
2007 | ||
2008 | /* No skb_postpush_rcsum(skb, skb->data + off, len) | |
2009 | * needed here as it does not change the skb->csum | |
2010 | * result for checksum complete when summing over | |
2011 | * zeroed blocks. | |
2012 | */ | |
2013 | return 0; | |
2014 | } | |
2015 | ||
2016 | static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) | |
2017 | { | |
2018 | /* skb_ensure_writable() is not needed here, as we're | |
2019 | * already working on an uncloned skb. | |
2020 | */ | |
2021 | if (unlikely(!pskb_may_pull(skb, off + len))) | |
2022 | return -ENOMEM; | |
2023 | ||
2024 | skb_postpull_rcsum(skb, skb->data + off, len); | |
2025 | memmove(skb->data + len, skb->data, off); | |
2026 | __skb_pull(skb, len); | |
2027 | ||
2028 | return 0; | |
2029 | } | |
2030 | ||
2031 | static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) | |
2032 | { | |
2033 | bool trans_same = skb->transport_header == skb->network_header; | |
2034 | int ret; | |
2035 | ||
2036 | /* There's no need for __skb_push()/__skb_pull() pair to | |
2037 | * get to the start of the mac header as we're guaranteed | |
2038 | * to always start from here under eBPF. | |
2039 | */ | |
2040 | ret = bpf_skb_generic_push(skb, off, len); | |
2041 | if (likely(!ret)) { | |
2042 | skb->mac_header -= len; | |
2043 | skb->network_header -= len; | |
2044 | if (trans_same) | |
2045 | skb->transport_header = skb->network_header; | |
2046 | } | |
2047 | ||
2048 | return ret; | |
2049 | } | |
2050 | ||
2051 | static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) | |
2052 | { | |
2053 | bool trans_same = skb->transport_header == skb->network_header; | |
2054 | int ret; | |
2055 | ||
2056 | /* Same here, __skb_push()/__skb_pull() pair not needed. */ | |
2057 | ret = bpf_skb_generic_pop(skb, off, len); | |
2058 | if (likely(!ret)) { | |
2059 | skb->mac_header += len; | |
2060 | skb->network_header += len; | |
2061 | if (trans_same) | |
2062 | skb->transport_header = skb->network_header; | |
2063 | } | |
2064 | ||
2065 | return ret; | |
2066 | } | |
2067 | ||
2068 | static int bpf_skb_proto_4_to_6(struct sk_buff *skb) | |
2069 | { | |
2070 | const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); | |
0daf4349 | 2071 | u32 off = skb_mac_header_len(skb); |
6578171a DB |
2072 | int ret; |
2073 | ||
2074 | ret = skb_cow(skb, len_diff); | |
2075 | if (unlikely(ret < 0)) | |
2076 | return ret; | |
2077 | ||
2078 | ret = bpf_skb_net_hdr_push(skb, off, len_diff); | |
2079 | if (unlikely(ret < 0)) | |
2080 | return ret; | |
2081 | ||
2082 | if (skb_is_gso(skb)) { | |
880388aa DM |
2083 | /* SKB_GSO_TCPV4 needs to be changed into |
2084 | * SKB_GSO_TCPV6. | |
6578171a DB |
2085 | */ |
2086 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) { | |
2087 | skb_shinfo(skb)->gso_type &= ~SKB_GSO_TCPV4; | |
2088 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6; | |
2089 | } | |
2090 | ||
2091 | /* Due to IPv6 header, MSS needs to be downgraded. */ | |
2092 | skb_shinfo(skb)->gso_size -= len_diff; | |
2093 | /* Header must be checked, and gso_segs recomputed. */ | |
2094 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2095 | skb_shinfo(skb)->gso_segs = 0; | |
2096 | } | |
2097 | ||
2098 | skb->protocol = htons(ETH_P_IPV6); | |
2099 | skb_clear_hash(skb); | |
2100 | ||
2101 | return 0; | |
2102 | } | |
2103 | ||
2104 | static int bpf_skb_proto_6_to_4(struct sk_buff *skb) | |
2105 | { | |
2106 | const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); | |
0daf4349 | 2107 | u32 off = skb_mac_header_len(skb); |
6578171a DB |
2108 | int ret; |
2109 | ||
2110 | ret = skb_unclone(skb, GFP_ATOMIC); | |
2111 | if (unlikely(ret < 0)) | |
2112 | return ret; | |
2113 | ||
2114 | ret = bpf_skb_net_hdr_pop(skb, off, len_diff); | |
2115 | if (unlikely(ret < 0)) | |
2116 | return ret; | |
2117 | ||
2118 | if (skb_is_gso(skb)) { | |
880388aa DM |
2119 | /* SKB_GSO_TCPV6 needs to be changed into |
2120 | * SKB_GSO_TCPV4. | |
6578171a DB |
2121 | */ |
2122 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) { | |
2123 | skb_shinfo(skb)->gso_type &= ~SKB_GSO_TCPV6; | |
2124 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4; | |
2125 | } | |
2126 | ||
2127 | /* Due to IPv4 header, MSS can be upgraded. */ | |
2128 | skb_shinfo(skb)->gso_size += len_diff; | |
2129 | /* Header must be checked, and gso_segs recomputed. */ | |
2130 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2131 | skb_shinfo(skb)->gso_segs = 0; | |
2132 | } | |
2133 | ||
2134 | skb->protocol = htons(ETH_P_IP); | |
2135 | skb_clear_hash(skb); | |
2136 | ||
2137 | return 0; | |
2138 | } | |
2139 | ||
2140 | static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) | |
2141 | { | |
2142 | __be16 from_proto = skb->protocol; | |
2143 | ||
2144 | if (from_proto == htons(ETH_P_IP) && | |
2145 | to_proto == htons(ETH_P_IPV6)) | |
2146 | return bpf_skb_proto_4_to_6(skb); | |
2147 | ||
2148 | if (from_proto == htons(ETH_P_IPV6) && | |
2149 | to_proto == htons(ETH_P_IP)) | |
2150 | return bpf_skb_proto_6_to_4(skb); | |
2151 | ||
2152 | return -ENOTSUPP; | |
2153 | } | |
2154 | ||
f3694e00 DB |
2155 | BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, |
2156 | u64, flags) | |
6578171a | 2157 | { |
6578171a DB |
2158 | int ret; |
2159 | ||
2160 | if (unlikely(flags)) | |
2161 | return -EINVAL; | |
2162 | ||
2163 | /* General idea is that this helper does the basic groundwork | |
2164 | * needed for changing the protocol, and eBPF program fills the | |
2165 | * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() | |
2166 | * and other helpers, rather than passing a raw buffer here. | |
2167 | * | |
2168 | * The rationale is to keep this minimal and without a need to | |
2169 | * deal with raw packet data. F.e. even if we would pass buffers | |
2170 | * here, the program still needs to call the bpf_lX_csum_replace() | |
2171 | * helpers anyway. Plus, this way we keep also separation of | |
2172 | * concerns, since f.e. bpf_skb_store_bytes() should only take | |
2173 | * care of stores. | |
2174 | * | |
2175 | * Currently, additional options and extension header space are | |
2176 | * not supported, but flags register is reserved so we can adapt | |
2177 | * that. For offloads, we mark packet as dodgy, so that headers | |
2178 | * need to be verified first. | |
2179 | */ | |
2180 | ret = bpf_skb_proto_xlat(skb, proto); | |
2181 | bpf_compute_data_end(skb); | |
2182 | return ret; | |
2183 | } | |
2184 | ||
2185 | static const struct bpf_func_proto bpf_skb_change_proto_proto = { | |
2186 | .func = bpf_skb_change_proto, | |
2187 | .gpl_only = false, | |
2188 | .ret_type = RET_INTEGER, | |
2189 | .arg1_type = ARG_PTR_TO_CTX, | |
2190 | .arg2_type = ARG_ANYTHING, | |
2191 | .arg3_type = ARG_ANYTHING, | |
2192 | }; | |
2193 | ||
f3694e00 | 2194 | BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) |
d2485c42 | 2195 | { |
d2485c42 | 2196 | /* We only allow a restricted subset to be changed for now. */ |
45c7fffa DB |
2197 | if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || |
2198 | !skb_pkt_type_ok(pkt_type))) | |
d2485c42 DB |
2199 | return -EINVAL; |
2200 | ||
2201 | skb->pkt_type = pkt_type; | |
2202 | return 0; | |
2203 | } | |
2204 | ||
2205 | static const struct bpf_func_proto bpf_skb_change_type_proto = { | |
2206 | .func = bpf_skb_change_type, | |
2207 | .gpl_only = false, | |
2208 | .ret_type = RET_INTEGER, | |
2209 | .arg1_type = ARG_PTR_TO_CTX, | |
2210 | .arg2_type = ARG_ANYTHING, | |
2211 | }; | |
2212 | ||
2be7e212 DB |
2213 | static u32 bpf_skb_net_base_len(const struct sk_buff *skb) |
2214 | { | |
2215 | switch (skb->protocol) { | |
2216 | case htons(ETH_P_IP): | |
2217 | return sizeof(struct iphdr); | |
2218 | case htons(ETH_P_IPV6): | |
2219 | return sizeof(struct ipv6hdr); | |
2220 | default: | |
2221 | return ~0U; | |
2222 | } | |
2223 | } | |
2224 | ||
2225 | static int bpf_skb_net_grow(struct sk_buff *skb, u32 len_diff) | |
2226 | { | |
2227 | u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb); | |
2228 | int ret; | |
2229 | ||
2230 | ret = skb_cow(skb, len_diff); | |
2231 | if (unlikely(ret < 0)) | |
2232 | return ret; | |
2233 | ||
2234 | ret = bpf_skb_net_hdr_push(skb, off, len_diff); | |
2235 | if (unlikely(ret < 0)) | |
2236 | return ret; | |
2237 | ||
2238 | if (skb_is_gso(skb)) { | |
2239 | /* Due to header grow, MSS needs to be downgraded. */ | |
2240 | skb_shinfo(skb)->gso_size -= len_diff; | |
2241 | /* Header must be checked, and gso_segs recomputed. */ | |
2242 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2243 | skb_shinfo(skb)->gso_segs = 0; | |
2244 | } | |
2245 | ||
2246 | return 0; | |
2247 | } | |
2248 | ||
2249 | static int bpf_skb_net_shrink(struct sk_buff *skb, u32 len_diff) | |
2250 | { | |
2251 | u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb); | |
2252 | int ret; | |
2253 | ||
2254 | ret = skb_unclone(skb, GFP_ATOMIC); | |
2255 | if (unlikely(ret < 0)) | |
2256 | return ret; | |
2257 | ||
2258 | ret = bpf_skb_net_hdr_pop(skb, off, len_diff); | |
2259 | if (unlikely(ret < 0)) | |
2260 | return ret; | |
2261 | ||
2262 | if (skb_is_gso(skb)) { | |
2263 | /* Due to header shrink, MSS can be upgraded. */ | |
2264 | skb_shinfo(skb)->gso_size += len_diff; | |
2265 | /* Header must be checked, and gso_segs recomputed. */ | |
2266 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2267 | skb_shinfo(skb)->gso_segs = 0; | |
2268 | } | |
2269 | ||
2270 | return 0; | |
2271 | } | |
2272 | ||
2273 | static u32 __bpf_skb_max_len(const struct sk_buff *skb) | |
2274 | { | |
2275 | return skb->dev->mtu + skb->dev->hard_header_len; | |
2276 | } | |
2277 | ||
2278 | static int bpf_skb_adjust_net(struct sk_buff *skb, s32 len_diff) | |
2279 | { | |
2280 | bool trans_same = skb->transport_header == skb->network_header; | |
2281 | u32 len_cur, len_diff_abs = abs(len_diff); | |
2282 | u32 len_min = bpf_skb_net_base_len(skb); | |
2283 | u32 len_max = __bpf_skb_max_len(skb); | |
2284 | __be16 proto = skb->protocol; | |
2285 | bool shrink = len_diff < 0; | |
2286 | int ret; | |
2287 | ||
2288 | if (unlikely(len_diff_abs > 0xfffU)) | |
2289 | return -EFAULT; | |
2290 | if (unlikely(proto != htons(ETH_P_IP) && | |
2291 | proto != htons(ETH_P_IPV6))) | |
2292 | return -ENOTSUPP; | |
2293 | ||
2294 | len_cur = skb->len - skb_network_offset(skb); | |
2295 | if (skb_transport_header_was_set(skb) && !trans_same) | |
2296 | len_cur = skb_network_header_len(skb); | |
2297 | if ((shrink && (len_diff_abs >= len_cur || | |
2298 | len_cur - len_diff_abs < len_min)) || | |
2299 | (!shrink && (skb->len + len_diff_abs > len_max && | |
2300 | !skb_is_gso(skb)))) | |
2301 | return -ENOTSUPP; | |
2302 | ||
2303 | ret = shrink ? bpf_skb_net_shrink(skb, len_diff_abs) : | |
2304 | bpf_skb_net_grow(skb, len_diff_abs); | |
2305 | ||
2306 | bpf_compute_data_end(skb); | |
e4a6a342 | 2307 | return ret; |
2be7e212 DB |
2308 | } |
2309 | ||
2310 | BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, | |
2311 | u32, mode, u64, flags) | |
2312 | { | |
2313 | if (unlikely(flags)) | |
2314 | return -EINVAL; | |
2315 | if (likely(mode == BPF_ADJ_ROOM_NET)) | |
2316 | return bpf_skb_adjust_net(skb, len_diff); | |
2317 | ||
2318 | return -ENOTSUPP; | |
2319 | } | |
2320 | ||
2321 | static const struct bpf_func_proto bpf_skb_adjust_room_proto = { | |
2322 | .func = bpf_skb_adjust_room, | |
2323 | .gpl_only = false, | |
2324 | .ret_type = RET_INTEGER, | |
2325 | .arg1_type = ARG_PTR_TO_CTX, | |
2326 | .arg2_type = ARG_ANYTHING, | |
2327 | .arg3_type = ARG_ANYTHING, | |
2328 | .arg4_type = ARG_ANYTHING, | |
2329 | }; | |
2330 | ||
5293efe6 DB |
2331 | static u32 __bpf_skb_min_len(const struct sk_buff *skb) |
2332 | { | |
2333 | u32 min_len = skb_network_offset(skb); | |
2334 | ||
2335 | if (skb_transport_header_was_set(skb)) | |
2336 | min_len = skb_transport_offset(skb); | |
2337 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
2338 | min_len = skb_checksum_start_offset(skb) + | |
2339 | skb->csum_offset + sizeof(__sum16); | |
2340 | return min_len; | |
2341 | } | |
2342 | ||
5293efe6 DB |
2343 | static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) |
2344 | { | |
2345 | unsigned int old_len = skb->len; | |
2346 | int ret; | |
2347 | ||
2348 | ret = __skb_grow_rcsum(skb, new_len); | |
2349 | if (!ret) | |
2350 | memset(skb->data + old_len, 0, new_len - old_len); | |
2351 | return ret; | |
2352 | } | |
2353 | ||
2354 | static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) | |
2355 | { | |
2356 | return __skb_trim_rcsum(skb, new_len); | |
2357 | } | |
2358 | ||
f3694e00 DB |
2359 | BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, |
2360 | u64, flags) | |
5293efe6 | 2361 | { |
5293efe6 DB |
2362 | u32 max_len = __bpf_skb_max_len(skb); |
2363 | u32 min_len = __bpf_skb_min_len(skb); | |
5293efe6 DB |
2364 | int ret; |
2365 | ||
2366 | if (unlikely(flags || new_len > max_len || new_len < min_len)) | |
2367 | return -EINVAL; | |
2368 | if (skb->encapsulation) | |
2369 | return -ENOTSUPP; | |
2370 | ||
2371 | /* The basic idea of this helper is that it's performing the | |
2372 | * needed work to either grow or trim an skb, and eBPF program | |
2373 | * rewrites the rest via helpers like bpf_skb_store_bytes(), | |
2374 | * bpf_lX_csum_replace() and others rather than passing a raw | |
2375 | * buffer here. This one is a slow path helper and intended | |
2376 | * for replies with control messages. | |
2377 | * | |
2378 | * Like in bpf_skb_change_proto(), we want to keep this rather | |
2379 | * minimal and without protocol specifics so that we are able | |
2380 | * to separate concerns as in bpf_skb_store_bytes() should only | |
2381 | * be the one responsible for writing buffers. | |
2382 | * | |
2383 | * It's really expected to be a slow path operation here for | |
2384 | * control message replies, so we're implicitly linearizing, | |
2385 | * uncloning and drop offloads from the skb by this. | |
2386 | */ | |
2387 | ret = __bpf_try_make_writable(skb, skb->len); | |
2388 | if (!ret) { | |
2389 | if (new_len > skb->len) | |
2390 | ret = bpf_skb_grow_rcsum(skb, new_len); | |
2391 | else if (new_len < skb->len) | |
2392 | ret = bpf_skb_trim_rcsum(skb, new_len); | |
2393 | if (!ret && skb_is_gso(skb)) | |
2394 | skb_gso_reset(skb); | |
2395 | } | |
2396 | ||
2397 | bpf_compute_data_end(skb); | |
2398 | return ret; | |
2399 | } | |
2400 | ||
2401 | static const struct bpf_func_proto bpf_skb_change_tail_proto = { | |
2402 | .func = bpf_skb_change_tail, | |
2403 | .gpl_only = false, | |
2404 | .ret_type = RET_INTEGER, | |
2405 | .arg1_type = ARG_PTR_TO_CTX, | |
2406 | .arg2_type = ARG_ANYTHING, | |
2407 | .arg3_type = ARG_ANYTHING, | |
2408 | }; | |
2409 | ||
3a0af8fd TG |
2410 | BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, |
2411 | u64, flags) | |
2412 | { | |
2413 | u32 max_len = __bpf_skb_max_len(skb); | |
2414 | u32 new_len = skb->len + head_room; | |
2415 | int ret; | |
2416 | ||
2417 | if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || | |
2418 | new_len < skb->len)) | |
2419 | return -EINVAL; | |
2420 | ||
2421 | ret = skb_cow(skb, head_room); | |
2422 | if (likely(!ret)) { | |
2423 | /* Idea for this helper is that we currently only | |
2424 | * allow to expand on mac header. This means that | |
2425 | * skb->protocol network header, etc, stay as is. | |
2426 | * Compared to bpf_skb_change_tail(), we're more | |
2427 | * flexible due to not needing to linearize or | |
2428 | * reset GSO. Intention for this helper is to be | |
2429 | * used by an L3 skb that needs to push mac header | |
2430 | * for redirection into L2 device. | |
2431 | */ | |
2432 | __skb_push(skb, head_room); | |
2433 | memset(skb->data, 0, head_room); | |
2434 | skb_reset_mac_header(skb); | |
2435 | } | |
2436 | ||
2437 | bpf_compute_data_end(skb); | |
2438 | return 0; | |
2439 | } | |
2440 | ||
2441 | static const struct bpf_func_proto bpf_skb_change_head_proto = { | |
2442 | .func = bpf_skb_change_head, | |
2443 | .gpl_only = false, | |
2444 | .ret_type = RET_INTEGER, | |
2445 | .arg1_type = ARG_PTR_TO_CTX, | |
2446 | .arg2_type = ARG_ANYTHING, | |
2447 | .arg3_type = ARG_ANYTHING, | |
2448 | }; | |
2449 | ||
17bedab2 MKL |
2450 | BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) |
2451 | { | |
2452 | void *data = xdp->data + offset; | |
2453 | ||
2454 | if (unlikely(data < xdp->data_hard_start || | |
2455 | data > xdp->data_end - ETH_HLEN)) | |
2456 | return -EINVAL; | |
2457 | ||
2458 | xdp->data = data; | |
2459 | ||
2460 | return 0; | |
2461 | } | |
2462 | ||
2463 | static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { | |
2464 | .func = bpf_xdp_adjust_head, | |
2465 | .gpl_only = false, | |
2466 | .ret_type = RET_INTEGER, | |
2467 | .arg1_type = ARG_PTR_TO_CTX, | |
2468 | .arg2_type = ARG_ANYTHING, | |
2469 | }; | |
2470 | ||
11393cc9 JF |
2471 | static int __bpf_tx_xdp(struct net_device *dev, |
2472 | struct bpf_map *map, | |
2473 | struct xdp_buff *xdp, | |
2474 | u32 index) | |
814abfab | 2475 | { |
11393cc9 JF |
2476 | int err; |
2477 | ||
2478 | if (!dev->netdev_ops->ndo_xdp_xmit) { | |
11393cc9 | 2479 | return -EOPNOTSUPP; |
814abfab | 2480 | } |
11393cc9 JF |
2481 | |
2482 | err = dev->netdev_ops->ndo_xdp_xmit(dev, xdp); | |
2483 | if (err) | |
2484 | return err; | |
11393cc9 JF |
2485 | if (map) |
2486 | __dev_map_insert_ctx(map, index); | |
2487 | else | |
2488 | dev->netdev_ops->ndo_xdp_flush(dev); | |
e4a8e817 | 2489 | return 0; |
814abfab JF |
2490 | } |
2491 | ||
11393cc9 JF |
2492 | void xdp_do_flush_map(void) |
2493 | { | |
2494 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
2495 | struct bpf_map *map = ri->map_to_flush; | |
2496 | ||
11393cc9 | 2497 | ri->map_to_flush = NULL; |
11393cc9 JF |
2498 | if (map) |
2499 | __dev_map_flush(map); | |
2500 | } | |
2501 | EXPORT_SYMBOL_GPL(xdp_do_flush_map); | |
2502 | ||
e4a8e817 DB |
2503 | static int xdp_do_redirect_map(struct net_device *dev, struct xdp_buff *xdp, |
2504 | struct bpf_prog *xdp_prog) | |
97f91a7c JF |
2505 | { |
2506 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
2507 | struct bpf_map *map = ri->map; | |
11393cc9 | 2508 | u32 index = ri->ifindex; |
97f91a7c | 2509 | struct net_device *fwd; |
4c03bdd7 | 2510 | int err; |
97f91a7c JF |
2511 | |
2512 | ri->ifindex = 0; | |
2513 | ri->map = NULL; | |
2514 | ||
11393cc9 | 2515 | fwd = __dev_map_lookup_elem(map, index); |
4c03bdd7 JDB |
2516 | if (!fwd) { |
2517 | err = -EINVAL; | |
97f91a7c | 2518 | goto out; |
4c03bdd7 | 2519 | } |
e4a8e817 | 2520 | if (ri->map_to_flush && ri->map_to_flush != map) |
11393cc9 JF |
2521 | xdp_do_flush_map(); |
2522 | ||
2523 | err = __bpf_tx_xdp(fwd, map, xdp, index); | |
2524 | if (likely(!err)) | |
2525 | ri->map_to_flush = map; | |
97f91a7c | 2526 | out: |
4c03bdd7 | 2527 | trace_xdp_redirect(dev, fwd, xdp_prog, XDP_REDIRECT, err); |
97f91a7c JF |
2528 | return err; |
2529 | } | |
2530 | ||
5acaee0a JF |
2531 | int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, |
2532 | struct bpf_prog *xdp_prog) | |
814abfab JF |
2533 | { |
2534 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
5acaee0a | 2535 | struct net_device *fwd; |
eb48d682 | 2536 | u32 index = ri->ifindex; |
4c03bdd7 | 2537 | int err; |
814abfab | 2538 | |
97f91a7c JF |
2539 | if (ri->map) |
2540 | return xdp_do_redirect_map(dev, xdp, xdp_prog); | |
2541 | ||
eb48d682 | 2542 | fwd = dev_get_by_index_rcu(dev_net(dev), index); |
814abfab | 2543 | ri->ifindex = 0; |
5acaee0a | 2544 | if (unlikely(!fwd)) { |
4c03bdd7 JDB |
2545 | err = -EINVAL; |
2546 | goto out; | |
814abfab JF |
2547 | } |
2548 | ||
4c03bdd7 JDB |
2549 | err = __bpf_tx_xdp(fwd, NULL, xdp, 0); |
2550 | out: | |
2551 | trace_xdp_redirect(dev, fwd, xdp_prog, XDP_REDIRECT, err); | |
2552 | return err; | |
814abfab JF |
2553 | } |
2554 | EXPORT_SYMBOL_GPL(xdp_do_redirect); | |
2555 | ||
6103aa96 JF |
2556 | int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb) |
2557 | { | |
2558 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
2559 | unsigned int len; | |
eb48d682 | 2560 | u32 index = ri->ifindex; |
6103aa96 | 2561 | |
eb48d682 | 2562 | dev = dev_get_by_index_rcu(dev_net(dev), index); |
6103aa96 JF |
2563 | ri->ifindex = 0; |
2564 | if (unlikely(!dev)) { | |
e4a8e817 | 2565 | return -EINVAL; |
6103aa96 JF |
2566 | } |
2567 | ||
2568 | if (unlikely(!(dev->flags & IFF_UP))) | |
e4a8e817 | 2569 | return -ENETDOWN; |
6103aa96 JF |
2570 | len = dev->mtu + dev->hard_header_len + VLAN_HLEN; |
2571 | if (skb->len > len) | |
e4a8e817 | 2572 | return -E2BIG; |
6103aa96 JF |
2573 | |
2574 | skb->dev = dev; | |
2575 | return 0; | |
6103aa96 JF |
2576 | } |
2577 | EXPORT_SYMBOL_GPL(xdp_do_generic_redirect); | |
2578 | ||
814abfab JF |
2579 | BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) |
2580 | { | |
2581 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
2582 | ||
2583 | if (unlikely(flags)) | |
2584 | return XDP_ABORTED; | |
2585 | ||
2586 | ri->ifindex = ifindex; | |
2587 | ri->flags = flags; | |
e4a8e817 | 2588 | |
814abfab JF |
2589 | return XDP_REDIRECT; |
2590 | } | |
2591 | ||
2592 | static const struct bpf_func_proto bpf_xdp_redirect_proto = { | |
2593 | .func = bpf_xdp_redirect, | |
2594 | .gpl_only = false, | |
2595 | .ret_type = RET_INTEGER, | |
2596 | .arg1_type = ARG_ANYTHING, | |
2597 | .arg2_type = ARG_ANYTHING, | |
2598 | }; | |
2599 | ||
e4a8e817 DB |
2600 | BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex, u64, flags) |
2601 | { | |
2602 | struct redirect_info *ri = this_cpu_ptr(&redirect_info); | |
2603 | ||
2604 | if (unlikely(flags)) | |
2605 | return XDP_ABORTED; | |
2606 | ||
2607 | ri->ifindex = ifindex; | |
2608 | ri->flags = flags; | |
2609 | ri->map = map; | |
2610 | ||
2611 | return XDP_REDIRECT; | |
2612 | } | |
2613 | ||
2614 | static const struct bpf_func_proto bpf_xdp_redirect_map_proto = { | |
2615 | .func = bpf_xdp_redirect_map, | |
2616 | .gpl_only = false, | |
2617 | .ret_type = RET_INTEGER, | |
2618 | .arg1_type = ARG_CONST_MAP_PTR, | |
2619 | .arg2_type = ARG_ANYTHING, | |
2620 | .arg3_type = ARG_ANYTHING, | |
2621 | }; | |
2622 | ||
17bedab2 | 2623 | bool bpf_helper_changes_pkt_data(void *func) |
4e10df9a | 2624 | { |
36bbef52 DB |
2625 | if (func == bpf_skb_vlan_push || |
2626 | func == bpf_skb_vlan_pop || | |
2627 | func == bpf_skb_store_bytes || | |
2628 | func == bpf_skb_change_proto || | |
3a0af8fd | 2629 | func == bpf_skb_change_head || |
36bbef52 | 2630 | func == bpf_skb_change_tail || |
2be7e212 | 2631 | func == bpf_skb_adjust_room || |
36bbef52 | 2632 | func == bpf_skb_pull_data || |
41703a73 | 2633 | func == bpf_clone_redirect || |
36bbef52 | 2634 | func == bpf_l3_csum_replace || |
17bedab2 MKL |
2635 | func == bpf_l4_csum_replace || |
2636 | func == bpf_xdp_adjust_head) | |
3697649f DB |
2637 | return true; |
2638 | ||
4e10df9a AS |
2639 | return false; |
2640 | } | |
2641 | ||
555c8a86 | 2642 | static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, |
aa7145c1 | 2643 | unsigned long off, unsigned long len) |
555c8a86 | 2644 | { |
aa7145c1 | 2645 | void *ptr = skb_header_pointer(skb, off, len, dst_buff); |
555c8a86 DB |
2646 | |
2647 | if (unlikely(!ptr)) | |
2648 | return len; | |
2649 | if (ptr != dst_buff) | |
2650 | memcpy(dst_buff, ptr, len); | |
2651 | ||
2652 | return 0; | |
2653 | } | |
2654 | ||
f3694e00 DB |
2655 | BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, |
2656 | u64, flags, void *, meta, u64, meta_size) | |
555c8a86 | 2657 | { |
555c8a86 | 2658 | u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; |
555c8a86 DB |
2659 | |
2660 | if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) | |
2661 | return -EINVAL; | |
2662 | if (unlikely(skb_size > skb->len)) | |
2663 | return -EFAULT; | |
2664 | ||
2665 | return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, | |
2666 | bpf_skb_copy); | |
2667 | } | |
2668 | ||
2669 | static const struct bpf_func_proto bpf_skb_event_output_proto = { | |
2670 | .func = bpf_skb_event_output, | |
2671 | .gpl_only = true, | |
2672 | .ret_type = RET_INTEGER, | |
2673 | .arg1_type = ARG_PTR_TO_CTX, | |
2674 | .arg2_type = ARG_CONST_MAP_PTR, | |
2675 | .arg3_type = ARG_ANYTHING, | |
39f19ebb AS |
2676 | .arg4_type = ARG_PTR_TO_MEM, |
2677 | .arg5_type = ARG_CONST_SIZE, | |
555c8a86 DB |
2678 | }; |
2679 | ||
c6c33454 DB |
2680 | static unsigned short bpf_tunnel_key_af(u64 flags) |
2681 | { | |
2682 | return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; | |
2683 | } | |
2684 | ||
f3694e00 DB |
2685 | BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, |
2686 | u32, size, u64, flags) | |
d3aa45ce | 2687 | { |
c6c33454 DB |
2688 | const struct ip_tunnel_info *info = skb_tunnel_info(skb); |
2689 | u8 compat[sizeof(struct bpf_tunnel_key)]; | |
074f528e DB |
2690 | void *to_orig = to; |
2691 | int err; | |
d3aa45ce | 2692 | |
074f528e DB |
2693 | if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) { |
2694 | err = -EINVAL; | |
2695 | goto err_clear; | |
2696 | } | |
2697 | if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { | |
2698 | err = -EPROTO; | |
2699 | goto err_clear; | |
2700 | } | |
c6c33454 | 2701 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) { |
074f528e | 2702 | err = -EINVAL; |
c6c33454 | 2703 | switch (size) { |
4018ab18 | 2704 | case offsetof(struct bpf_tunnel_key, tunnel_label): |
c0e760c9 | 2705 | case offsetof(struct bpf_tunnel_key, tunnel_ext): |
4018ab18 | 2706 | goto set_compat; |
c6c33454 DB |
2707 | case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): |
2708 | /* Fixup deprecated structure layouts here, so we have | |
2709 | * a common path later on. | |
2710 | */ | |
2711 | if (ip_tunnel_info_af(info) != AF_INET) | |
074f528e | 2712 | goto err_clear; |
4018ab18 | 2713 | set_compat: |
c6c33454 DB |
2714 | to = (struct bpf_tunnel_key *)compat; |
2715 | break; | |
2716 | default: | |
074f528e | 2717 | goto err_clear; |
c6c33454 DB |
2718 | } |
2719 | } | |
d3aa45ce AS |
2720 | |
2721 | to->tunnel_id = be64_to_cpu(info->key.tun_id); | |
c6c33454 DB |
2722 | to->tunnel_tos = info->key.tos; |
2723 | to->tunnel_ttl = info->key.ttl; | |
2724 | ||
4018ab18 | 2725 | if (flags & BPF_F_TUNINFO_IPV6) { |
c6c33454 DB |
2726 | memcpy(to->remote_ipv6, &info->key.u.ipv6.src, |
2727 | sizeof(to->remote_ipv6)); | |
4018ab18 DB |
2728 | to->tunnel_label = be32_to_cpu(info->key.label); |
2729 | } else { | |
c6c33454 | 2730 | to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); |
4018ab18 | 2731 | } |
c6c33454 DB |
2732 | |
2733 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) | |
074f528e | 2734 | memcpy(to_orig, to, size); |
d3aa45ce AS |
2735 | |
2736 | return 0; | |
074f528e DB |
2737 | err_clear: |
2738 | memset(to_orig, 0, size); | |
2739 | return err; | |
d3aa45ce AS |
2740 | } |
2741 | ||
577c50aa | 2742 | static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { |
d3aa45ce AS |
2743 | .func = bpf_skb_get_tunnel_key, |
2744 | .gpl_only = false, | |
2745 | .ret_type = RET_INTEGER, | |
2746 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
2747 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, |
2748 | .arg3_type = ARG_CONST_SIZE, | |
d3aa45ce AS |
2749 | .arg4_type = ARG_ANYTHING, |
2750 | }; | |
2751 | ||
f3694e00 | 2752 | BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) |
14ca0751 | 2753 | { |
14ca0751 | 2754 | const struct ip_tunnel_info *info = skb_tunnel_info(skb); |
074f528e | 2755 | int err; |
14ca0751 DB |
2756 | |
2757 | if (unlikely(!info || | |
074f528e DB |
2758 | !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { |
2759 | err = -ENOENT; | |
2760 | goto err_clear; | |
2761 | } | |
2762 | if (unlikely(size < info->options_len)) { | |
2763 | err = -ENOMEM; | |
2764 | goto err_clear; | |
2765 | } | |
14ca0751 DB |
2766 | |
2767 | ip_tunnel_info_opts_get(to, info); | |
074f528e DB |
2768 | if (size > info->options_len) |
2769 | memset(to + info->options_len, 0, size - info->options_len); | |
14ca0751 DB |
2770 | |
2771 | return info->options_len; | |
074f528e DB |
2772 | err_clear: |
2773 | memset(to, 0, size); | |
2774 | return err; | |
14ca0751 DB |
2775 | } |
2776 | ||
2777 | static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { | |
2778 | .func = bpf_skb_get_tunnel_opt, | |
2779 | .gpl_only = false, | |
2780 | .ret_type = RET_INTEGER, | |
2781 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
2782 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, |
2783 | .arg3_type = ARG_CONST_SIZE, | |
14ca0751 DB |
2784 | }; |
2785 | ||
d3aa45ce AS |
2786 | static struct metadata_dst __percpu *md_dst; |
2787 | ||
f3694e00 DB |
2788 | BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, |
2789 | const struct bpf_tunnel_key *, from, u32, size, u64, flags) | |
d3aa45ce | 2790 | { |
d3aa45ce | 2791 | struct metadata_dst *md = this_cpu_ptr(md_dst); |
c6c33454 | 2792 | u8 compat[sizeof(struct bpf_tunnel_key)]; |
d3aa45ce AS |
2793 | struct ip_tunnel_info *info; |
2794 | ||
22080870 DB |
2795 | if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | |
2796 | BPF_F_DONT_FRAGMENT))) | |
d3aa45ce | 2797 | return -EINVAL; |
c6c33454 DB |
2798 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) { |
2799 | switch (size) { | |
4018ab18 | 2800 | case offsetof(struct bpf_tunnel_key, tunnel_label): |
c0e760c9 | 2801 | case offsetof(struct bpf_tunnel_key, tunnel_ext): |
c6c33454 DB |
2802 | case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): |
2803 | /* Fixup deprecated structure layouts here, so we have | |
2804 | * a common path later on. | |
2805 | */ | |
2806 | memcpy(compat, from, size); | |
2807 | memset(compat + size, 0, sizeof(compat) - size); | |
f3694e00 | 2808 | from = (const struct bpf_tunnel_key *) compat; |
c6c33454 DB |
2809 | break; |
2810 | default: | |
2811 | return -EINVAL; | |
2812 | } | |
2813 | } | |
c0e760c9 DB |
2814 | if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || |
2815 | from->tunnel_ext)) | |
4018ab18 | 2816 | return -EINVAL; |
d3aa45ce AS |
2817 | |
2818 | skb_dst_drop(skb); | |
2819 | dst_hold((struct dst_entry *) md); | |
2820 | skb_dst_set(skb, (struct dst_entry *) md); | |
2821 | ||
2822 | info = &md->u.tun_info; | |
2823 | info->mode = IP_TUNNEL_INFO_TX; | |
c6c33454 | 2824 | |
db3c6139 | 2825 | info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; |
22080870 DB |
2826 | if (flags & BPF_F_DONT_FRAGMENT) |
2827 | info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; | |
2828 | ||
d3aa45ce | 2829 | info->key.tun_id = cpu_to_be64(from->tunnel_id); |
c6c33454 DB |
2830 | info->key.tos = from->tunnel_tos; |
2831 | info->key.ttl = from->tunnel_ttl; | |
2832 | ||
2833 | if (flags & BPF_F_TUNINFO_IPV6) { | |
2834 | info->mode |= IP_TUNNEL_INFO_IPV6; | |
2835 | memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, | |
2836 | sizeof(from->remote_ipv6)); | |
4018ab18 DB |
2837 | info->key.label = cpu_to_be32(from->tunnel_label) & |
2838 | IPV6_FLOWLABEL_MASK; | |
c6c33454 DB |
2839 | } else { |
2840 | info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); | |
2da897e5 DB |
2841 | if (flags & BPF_F_ZERO_CSUM_TX) |
2842 | info->key.tun_flags &= ~TUNNEL_CSUM; | |
c6c33454 | 2843 | } |
d3aa45ce AS |
2844 | |
2845 | return 0; | |
2846 | } | |
2847 | ||
577c50aa | 2848 | static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { |
d3aa45ce AS |
2849 | .func = bpf_skb_set_tunnel_key, |
2850 | .gpl_only = false, | |
2851 | .ret_type = RET_INTEGER, | |
2852 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
2853 | .arg2_type = ARG_PTR_TO_MEM, |
2854 | .arg3_type = ARG_CONST_SIZE, | |
d3aa45ce AS |
2855 | .arg4_type = ARG_ANYTHING, |
2856 | }; | |
2857 | ||
f3694e00 DB |
2858 | BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, |
2859 | const u8 *, from, u32, size) | |
14ca0751 | 2860 | { |
14ca0751 DB |
2861 | struct ip_tunnel_info *info = skb_tunnel_info(skb); |
2862 | const struct metadata_dst *md = this_cpu_ptr(md_dst); | |
2863 | ||
2864 | if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) | |
2865 | return -EINVAL; | |
fca5fdf6 | 2866 | if (unlikely(size > IP_TUNNEL_OPTS_MAX)) |
14ca0751 DB |
2867 | return -ENOMEM; |
2868 | ||
2869 | ip_tunnel_info_opts_set(info, from, size); | |
2870 | ||
2871 | return 0; | |
2872 | } | |
2873 | ||
2874 | static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { | |
2875 | .func = bpf_skb_set_tunnel_opt, | |
2876 | .gpl_only = false, | |
2877 | .ret_type = RET_INTEGER, | |
2878 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
2879 | .arg2_type = ARG_PTR_TO_MEM, |
2880 | .arg3_type = ARG_CONST_SIZE, | |
14ca0751 DB |
2881 | }; |
2882 | ||
2883 | static const struct bpf_func_proto * | |
2884 | bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) | |
d3aa45ce AS |
2885 | { |
2886 | if (!md_dst) { | |
14ca0751 DB |
2887 | /* Race is not possible, since it's called from verifier |
2888 | * that is holding verifier mutex. | |
d3aa45ce | 2889 | */ |
fca5fdf6 | 2890 | md_dst = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, |
3fcece12 | 2891 | METADATA_IP_TUNNEL, |
14ca0751 | 2892 | GFP_KERNEL); |
d3aa45ce AS |
2893 | if (!md_dst) |
2894 | return NULL; | |
2895 | } | |
14ca0751 DB |
2896 | |
2897 | switch (which) { | |
2898 | case BPF_FUNC_skb_set_tunnel_key: | |
2899 | return &bpf_skb_set_tunnel_key_proto; | |
2900 | case BPF_FUNC_skb_set_tunnel_opt: | |
2901 | return &bpf_skb_set_tunnel_opt_proto; | |
2902 | default: | |
2903 | return NULL; | |
2904 | } | |
d3aa45ce AS |
2905 | } |
2906 | ||
f3694e00 DB |
2907 | BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, |
2908 | u32, idx) | |
4a482f34 | 2909 | { |
4a482f34 MKL |
2910 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
2911 | struct cgroup *cgrp; | |
2912 | struct sock *sk; | |
4a482f34 | 2913 | |
2d48c5f9 | 2914 | sk = skb_to_full_sk(skb); |
4a482f34 MKL |
2915 | if (!sk || !sk_fullsock(sk)) |
2916 | return -ENOENT; | |
f3694e00 | 2917 | if (unlikely(idx >= array->map.max_entries)) |
4a482f34 MKL |
2918 | return -E2BIG; |
2919 | ||
f3694e00 | 2920 | cgrp = READ_ONCE(array->ptrs[idx]); |
4a482f34 MKL |
2921 | if (unlikely(!cgrp)) |
2922 | return -EAGAIN; | |
2923 | ||
54fd9c2d | 2924 | return sk_under_cgroup_hierarchy(sk, cgrp); |
4a482f34 MKL |
2925 | } |
2926 | ||
747ea55e DB |
2927 | static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { |
2928 | .func = bpf_skb_under_cgroup, | |
4a482f34 MKL |
2929 | .gpl_only = false, |
2930 | .ret_type = RET_INTEGER, | |
2931 | .arg1_type = ARG_PTR_TO_CTX, | |
2932 | .arg2_type = ARG_CONST_MAP_PTR, | |
2933 | .arg3_type = ARG_ANYTHING, | |
2934 | }; | |
4a482f34 | 2935 | |
4de16969 DB |
2936 | static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff, |
2937 | unsigned long off, unsigned long len) | |
2938 | { | |
2939 | memcpy(dst_buff, src_buff + off, len); | |
2940 | return 0; | |
2941 | } | |
2942 | ||
f3694e00 DB |
2943 | BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, |
2944 | u64, flags, void *, meta, u64, meta_size) | |
4de16969 | 2945 | { |
4de16969 | 2946 | u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; |
4de16969 DB |
2947 | |
2948 | if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) | |
2949 | return -EINVAL; | |
2950 | if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data))) | |
2951 | return -EFAULT; | |
2952 | ||
9c471370 MKL |
2953 | return bpf_event_output(map, flags, meta, meta_size, xdp->data, |
2954 | xdp_size, bpf_xdp_copy); | |
4de16969 DB |
2955 | } |
2956 | ||
2957 | static const struct bpf_func_proto bpf_xdp_event_output_proto = { | |
2958 | .func = bpf_xdp_event_output, | |
2959 | .gpl_only = true, | |
2960 | .ret_type = RET_INTEGER, | |
2961 | .arg1_type = ARG_PTR_TO_CTX, | |
2962 | .arg2_type = ARG_CONST_MAP_PTR, | |
2963 | .arg3_type = ARG_ANYTHING, | |
39f19ebb AS |
2964 | .arg4_type = ARG_PTR_TO_MEM, |
2965 | .arg5_type = ARG_CONST_SIZE, | |
4de16969 DB |
2966 | }; |
2967 | ||
91b8270f CF |
2968 | BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) |
2969 | { | |
2970 | return skb->sk ? sock_gen_cookie(skb->sk) : 0; | |
2971 | } | |
2972 | ||
2973 | static const struct bpf_func_proto bpf_get_socket_cookie_proto = { | |
2974 | .func = bpf_get_socket_cookie, | |
2975 | .gpl_only = false, | |
2976 | .ret_type = RET_INTEGER, | |
2977 | .arg1_type = ARG_PTR_TO_CTX, | |
2978 | }; | |
2979 | ||
6acc5c29 CF |
2980 | BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) |
2981 | { | |
2982 | struct sock *sk = sk_to_full_sk(skb->sk); | |
2983 | kuid_t kuid; | |
2984 | ||
2985 | if (!sk || !sk_fullsock(sk)) | |
2986 | return overflowuid; | |
2987 | kuid = sock_net_uid(sock_net(sk), sk); | |
2988 | return from_kuid_munged(sock_net(sk)->user_ns, kuid); | |
2989 | } | |
2990 | ||
2991 | static const struct bpf_func_proto bpf_get_socket_uid_proto = { | |
2992 | .func = bpf_get_socket_uid, | |
2993 | .gpl_only = false, | |
2994 | .ret_type = RET_INTEGER, | |
2995 | .arg1_type = ARG_PTR_TO_CTX, | |
2996 | }; | |
2997 | ||
8c4b4c7e LB |
2998 | BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, |
2999 | int, level, int, optname, char *, optval, int, optlen) | |
3000 | { | |
3001 | struct sock *sk = bpf_sock->sk; | |
3002 | int ret = 0; | |
3003 | int val; | |
3004 | ||
3005 | if (!sk_fullsock(sk)) | |
3006 | return -EINVAL; | |
3007 | ||
3008 | if (level == SOL_SOCKET) { | |
3009 | if (optlen != sizeof(int)) | |
3010 | return -EINVAL; | |
3011 | val = *((int *)optval); | |
3012 | ||
3013 | /* Only some socketops are supported */ | |
3014 | switch (optname) { | |
3015 | case SO_RCVBUF: | |
3016 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
3017 | sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); | |
3018 | break; | |
3019 | case SO_SNDBUF: | |
3020 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
3021 | sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); | |
3022 | break; | |
3023 | case SO_MAX_PACING_RATE: | |
3024 | sk->sk_max_pacing_rate = val; | |
3025 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, | |
3026 | sk->sk_max_pacing_rate); | |
3027 | break; | |
3028 | case SO_PRIORITY: | |
3029 | sk->sk_priority = val; | |
3030 | break; | |
3031 | case SO_RCVLOWAT: | |
3032 | if (val < 0) | |
3033 | val = INT_MAX; | |
3034 | sk->sk_rcvlowat = val ? : 1; | |
3035 | break; | |
3036 | case SO_MARK: | |
3037 | sk->sk_mark = val; | |
3038 | break; | |
3039 | default: | |
3040 | ret = -EINVAL; | |
3041 | } | |
a5192c52 | 3042 | #ifdef CONFIG_INET |
8c4b4c7e LB |
3043 | } else if (level == SOL_TCP && |
3044 | sk->sk_prot->setsockopt == tcp_setsockopt) { | |
91b5b21c LB |
3045 | if (optname == TCP_CONGESTION) { |
3046 | char name[TCP_CA_NAME_MAX]; | |
3047 | ||
3048 | strncpy(name, optval, min_t(long, optlen, | |
3049 | TCP_CA_NAME_MAX-1)); | |
3050 | name[TCP_CA_NAME_MAX-1] = 0; | |
3051 | ret = tcp_set_congestion_control(sk, name, false); | |
3052 | if (!ret && bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN) | |
3053 | /* replacing an existing ca */ | |
3054 | tcp_reinit_congestion_control(sk, | |
3055 | inet_csk(sk)->icsk_ca_ops); | |
3056 | } else { | |
fc747810 LB |
3057 | struct tcp_sock *tp = tcp_sk(sk); |
3058 | ||
3059 | if (optlen != sizeof(int)) | |
3060 | return -EINVAL; | |
3061 | ||
3062 | val = *((int *)optval); | |
3063 | /* Only some options are supported */ | |
3064 | switch (optname) { | |
3065 | case TCP_BPF_IW: | |
3066 | if (val <= 0 || tp->data_segs_out > 0) | |
3067 | ret = -EINVAL; | |
3068 | else | |
3069 | tp->snd_cwnd = val; | |
3070 | break; | |
13bf9641 LB |
3071 | case TCP_BPF_SNDCWND_CLAMP: |
3072 | if (val <= 0) { | |
3073 | ret = -EINVAL; | |
3074 | } else { | |
3075 | tp->snd_cwnd_clamp = val; | |
3076 | tp->snd_ssthresh = val; | |
3077 | } | |
6d3f06a0 | 3078 | break; |
fc747810 LB |
3079 | default: |
3080 | ret = -EINVAL; | |
3081 | } | |
91b5b21c | 3082 | } |
8c4b4c7e | 3083 | ret = -EINVAL; |
91b5b21c | 3084 | #endif |
8c4b4c7e LB |
3085 | } else { |
3086 | ret = -EINVAL; | |
3087 | } | |
3088 | return ret; | |
3089 | } | |
3090 | ||
3091 | static const struct bpf_func_proto bpf_setsockopt_proto = { | |
3092 | .func = bpf_setsockopt, | |
3093 | .gpl_only = true, | |
3094 | .ret_type = RET_INTEGER, | |
3095 | .arg1_type = ARG_PTR_TO_CTX, | |
3096 | .arg2_type = ARG_ANYTHING, | |
3097 | .arg3_type = ARG_ANYTHING, | |
3098 | .arg4_type = ARG_PTR_TO_MEM, | |
3099 | .arg5_type = ARG_CONST_SIZE, | |
3100 | }; | |
3101 | ||
d4052c4a | 3102 | static const struct bpf_func_proto * |
2492d3b8 | 3103 | bpf_base_func_proto(enum bpf_func_id func_id) |
89aa0758 AS |
3104 | { |
3105 | switch (func_id) { | |
3106 | case BPF_FUNC_map_lookup_elem: | |
3107 | return &bpf_map_lookup_elem_proto; | |
3108 | case BPF_FUNC_map_update_elem: | |
3109 | return &bpf_map_update_elem_proto; | |
3110 | case BPF_FUNC_map_delete_elem: | |
3111 | return &bpf_map_delete_elem_proto; | |
03e69b50 DB |
3112 | case BPF_FUNC_get_prandom_u32: |
3113 | return &bpf_get_prandom_u32_proto; | |
c04167ce | 3114 | case BPF_FUNC_get_smp_processor_id: |
80b48c44 | 3115 | return &bpf_get_raw_smp_processor_id_proto; |
2d0e30c3 DB |
3116 | case BPF_FUNC_get_numa_node_id: |
3117 | return &bpf_get_numa_node_id_proto; | |
04fd61ab AS |
3118 | case BPF_FUNC_tail_call: |
3119 | return &bpf_tail_call_proto; | |
17ca8cbf DB |
3120 | case BPF_FUNC_ktime_get_ns: |
3121 | return &bpf_ktime_get_ns_proto; | |
0756ea3e | 3122 | case BPF_FUNC_trace_printk: |
1be7f75d AS |
3123 | if (capable(CAP_SYS_ADMIN)) |
3124 | return bpf_get_trace_printk_proto(); | |
89aa0758 AS |
3125 | default: |
3126 | return NULL; | |
3127 | } | |
3128 | } | |
3129 | ||
2492d3b8 DB |
3130 | static const struct bpf_func_proto * |
3131 | sk_filter_func_proto(enum bpf_func_id func_id) | |
3132 | { | |
3133 | switch (func_id) { | |
3134 | case BPF_FUNC_skb_load_bytes: | |
3135 | return &bpf_skb_load_bytes_proto; | |
91b8270f CF |
3136 | case BPF_FUNC_get_socket_cookie: |
3137 | return &bpf_get_socket_cookie_proto; | |
6acc5c29 CF |
3138 | case BPF_FUNC_get_socket_uid: |
3139 | return &bpf_get_socket_uid_proto; | |
2492d3b8 DB |
3140 | default: |
3141 | return bpf_base_func_proto(func_id); | |
3142 | } | |
3143 | } | |
3144 | ||
608cd71a AS |
3145 | static const struct bpf_func_proto * |
3146 | tc_cls_act_func_proto(enum bpf_func_id func_id) | |
3147 | { | |
3148 | switch (func_id) { | |
3149 | case BPF_FUNC_skb_store_bytes: | |
3150 | return &bpf_skb_store_bytes_proto; | |
05c74e5e DB |
3151 | case BPF_FUNC_skb_load_bytes: |
3152 | return &bpf_skb_load_bytes_proto; | |
36bbef52 DB |
3153 | case BPF_FUNC_skb_pull_data: |
3154 | return &bpf_skb_pull_data_proto; | |
7d672345 DB |
3155 | case BPF_FUNC_csum_diff: |
3156 | return &bpf_csum_diff_proto; | |
36bbef52 DB |
3157 | case BPF_FUNC_csum_update: |
3158 | return &bpf_csum_update_proto; | |
91bc4822 AS |
3159 | case BPF_FUNC_l3_csum_replace: |
3160 | return &bpf_l3_csum_replace_proto; | |
3161 | case BPF_FUNC_l4_csum_replace: | |
3162 | return &bpf_l4_csum_replace_proto; | |
3896d655 AS |
3163 | case BPF_FUNC_clone_redirect: |
3164 | return &bpf_clone_redirect_proto; | |
8d20aabe DB |
3165 | case BPF_FUNC_get_cgroup_classid: |
3166 | return &bpf_get_cgroup_classid_proto; | |
4e10df9a AS |
3167 | case BPF_FUNC_skb_vlan_push: |
3168 | return &bpf_skb_vlan_push_proto; | |
3169 | case BPF_FUNC_skb_vlan_pop: | |
3170 | return &bpf_skb_vlan_pop_proto; | |
6578171a DB |
3171 | case BPF_FUNC_skb_change_proto: |
3172 | return &bpf_skb_change_proto_proto; | |
d2485c42 DB |
3173 | case BPF_FUNC_skb_change_type: |
3174 | return &bpf_skb_change_type_proto; | |
2be7e212 DB |
3175 | case BPF_FUNC_skb_adjust_room: |
3176 | return &bpf_skb_adjust_room_proto; | |
5293efe6 DB |
3177 | case BPF_FUNC_skb_change_tail: |
3178 | return &bpf_skb_change_tail_proto; | |
d3aa45ce AS |
3179 | case BPF_FUNC_skb_get_tunnel_key: |
3180 | return &bpf_skb_get_tunnel_key_proto; | |
3181 | case BPF_FUNC_skb_set_tunnel_key: | |
14ca0751 DB |
3182 | return bpf_get_skb_set_tunnel_proto(func_id); |
3183 | case BPF_FUNC_skb_get_tunnel_opt: | |
3184 | return &bpf_skb_get_tunnel_opt_proto; | |
3185 | case BPF_FUNC_skb_set_tunnel_opt: | |
3186 | return bpf_get_skb_set_tunnel_proto(func_id); | |
27b29f63 AS |
3187 | case BPF_FUNC_redirect: |
3188 | return &bpf_redirect_proto; | |
c46646d0 DB |
3189 | case BPF_FUNC_get_route_realm: |
3190 | return &bpf_get_route_realm_proto; | |
13c5c240 DB |
3191 | case BPF_FUNC_get_hash_recalc: |
3192 | return &bpf_get_hash_recalc_proto; | |
7a4b28c6 DB |
3193 | case BPF_FUNC_set_hash_invalid: |
3194 | return &bpf_set_hash_invalid_proto; | |
ded092cd DB |
3195 | case BPF_FUNC_set_hash: |
3196 | return &bpf_set_hash_proto; | |
bd570ff9 | 3197 | case BPF_FUNC_perf_event_output: |
555c8a86 | 3198 | return &bpf_skb_event_output_proto; |
80b48c44 DB |
3199 | case BPF_FUNC_get_smp_processor_id: |
3200 | return &bpf_get_smp_processor_id_proto; | |
747ea55e DB |
3201 | case BPF_FUNC_skb_under_cgroup: |
3202 | return &bpf_skb_under_cgroup_proto; | |
91b8270f CF |
3203 | case BPF_FUNC_get_socket_cookie: |
3204 | return &bpf_get_socket_cookie_proto; | |
6acc5c29 CF |
3205 | case BPF_FUNC_get_socket_uid: |
3206 | return &bpf_get_socket_uid_proto; | |
608cd71a | 3207 | default: |
2492d3b8 | 3208 | return bpf_base_func_proto(func_id); |
608cd71a AS |
3209 | } |
3210 | } | |
3211 | ||
6a773a15 BB |
3212 | static const struct bpf_func_proto * |
3213 | xdp_func_proto(enum bpf_func_id func_id) | |
3214 | { | |
4de16969 DB |
3215 | switch (func_id) { |
3216 | case BPF_FUNC_perf_event_output: | |
3217 | return &bpf_xdp_event_output_proto; | |
669dc4d7 DB |
3218 | case BPF_FUNC_get_smp_processor_id: |
3219 | return &bpf_get_smp_processor_id_proto; | |
17bedab2 MKL |
3220 | case BPF_FUNC_xdp_adjust_head: |
3221 | return &bpf_xdp_adjust_head_proto; | |
814abfab JF |
3222 | case BPF_FUNC_redirect: |
3223 | return &bpf_xdp_redirect_proto; | |
97f91a7c | 3224 | case BPF_FUNC_redirect_map: |
e4a8e817 | 3225 | return &bpf_xdp_redirect_map_proto; |
4de16969 | 3226 | default: |
2492d3b8 | 3227 | return bpf_base_func_proto(func_id); |
4de16969 | 3228 | } |
6a773a15 BB |
3229 | } |
3230 | ||
3a0af8fd TG |
3231 | static const struct bpf_func_proto * |
3232 | lwt_inout_func_proto(enum bpf_func_id func_id) | |
3233 | { | |
3234 | switch (func_id) { | |
3235 | case BPF_FUNC_skb_load_bytes: | |
3236 | return &bpf_skb_load_bytes_proto; | |
3237 | case BPF_FUNC_skb_pull_data: | |
3238 | return &bpf_skb_pull_data_proto; | |
3239 | case BPF_FUNC_csum_diff: | |
3240 | return &bpf_csum_diff_proto; | |
3241 | case BPF_FUNC_get_cgroup_classid: | |
3242 | return &bpf_get_cgroup_classid_proto; | |
3243 | case BPF_FUNC_get_route_realm: | |
3244 | return &bpf_get_route_realm_proto; | |
3245 | case BPF_FUNC_get_hash_recalc: | |
3246 | return &bpf_get_hash_recalc_proto; | |
3247 | case BPF_FUNC_perf_event_output: | |
3248 | return &bpf_skb_event_output_proto; | |
3249 | case BPF_FUNC_get_smp_processor_id: | |
3250 | return &bpf_get_smp_processor_id_proto; | |
3251 | case BPF_FUNC_skb_under_cgroup: | |
3252 | return &bpf_skb_under_cgroup_proto; | |
3253 | default: | |
2492d3b8 | 3254 | return bpf_base_func_proto(func_id); |
3a0af8fd TG |
3255 | } |
3256 | } | |
3257 | ||
8c4b4c7e LB |
3258 | static const struct bpf_func_proto * |
3259 | sock_ops_func_proto(enum bpf_func_id func_id) | |
3260 | { | |
3261 | switch (func_id) { | |
3262 | case BPF_FUNC_setsockopt: | |
3263 | return &bpf_setsockopt_proto; | |
174a79ff JF |
3264 | case BPF_FUNC_sock_map_update: |
3265 | return &bpf_sock_map_update_proto; | |
8c4b4c7e LB |
3266 | default: |
3267 | return bpf_base_func_proto(func_id); | |
3268 | } | |
3269 | } | |
3270 | ||
b005fd18 JF |
3271 | static const struct bpf_func_proto *sk_skb_func_proto(enum bpf_func_id func_id) |
3272 | { | |
3273 | switch (func_id) { | |
8a31db56 JF |
3274 | case BPF_FUNC_skb_store_bytes: |
3275 | return &bpf_skb_store_bytes_proto; | |
b005fd18 JF |
3276 | case BPF_FUNC_skb_load_bytes: |
3277 | return &bpf_skb_load_bytes_proto; | |
8a31db56 JF |
3278 | case BPF_FUNC_skb_pull_data: |
3279 | return &bpf_skb_pull_data_proto; | |
3280 | case BPF_FUNC_skb_change_tail: | |
3281 | return &bpf_skb_change_tail_proto; | |
3282 | case BPF_FUNC_skb_change_head: | |
3283 | return &bpf_skb_change_head_proto; | |
b005fd18 JF |
3284 | case BPF_FUNC_get_socket_cookie: |
3285 | return &bpf_get_socket_cookie_proto; | |
3286 | case BPF_FUNC_get_socket_uid: | |
3287 | return &bpf_get_socket_uid_proto; | |
174a79ff JF |
3288 | case BPF_FUNC_sk_redirect_map: |
3289 | return &bpf_sk_redirect_map_proto; | |
b005fd18 JF |
3290 | default: |
3291 | return bpf_base_func_proto(func_id); | |
3292 | } | |
3293 | } | |
3294 | ||
3a0af8fd TG |
3295 | static const struct bpf_func_proto * |
3296 | lwt_xmit_func_proto(enum bpf_func_id func_id) | |
3297 | { | |
3298 | switch (func_id) { | |
3299 | case BPF_FUNC_skb_get_tunnel_key: | |
3300 | return &bpf_skb_get_tunnel_key_proto; | |
3301 | case BPF_FUNC_skb_set_tunnel_key: | |
3302 | return bpf_get_skb_set_tunnel_proto(func_id); | |
3303 | case BPF_FUNC_skb_get_tunnel_opt: | |
3304 | return &bpf_skb_get_tunnel_opt_proto; | |
3305 | case BPF_FUNC_skb_set_tunnel_opt: | |
3306 | return bpf_get_skb_set_tunnel_proto(func_id); | |
3307 | case BPF_FUNC_redirect: | |
3308 | return &bpf_redirect_proto; | |
3309 | case BPF_FUNC_clone_redirect: | |
3310 | return &bpf_clone_redirect_proto; | |
3311 | case BPF_FUNC_skb_change_tail: | |
3312 | return &bpf_skb_change_tail_proto; | |
3313 | case BPF_FUNC_skb_change_head: | |
3314 | return &bpf_skb_change_head_proto; | |
3315 | case BPF_FUNC_skb_store_bytes: | |
3316 | return &bpf_skb_store_bytes_proto; | |
3317 | case BPF_FUNC_csum_update: | |
3318 | return &bpf_csum_update_proto; | |
3319 | case BPF_FUNC_l3_csum_replace: | |
3320 | return &bpf_l3_csum_replace_proto; | |
3321 | case BPF_FUNC_l4_csum_replace: | |
3322 | return &bpf_l4_csum_replace_proto; | |
3323 | case BPF_FUNC_set_hash_invalid: | |
3324 | return &bpf_set_hash_invalid_proto; | |
3325 | default: | |
3326 | return lwt_inout_func_proto(func_id); | |
3327 | } | |
3328 | } | |
3329 | ||
f96da094 DB |
3330 | static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, |
3331 | struct bpf_insn_access_aux *info) | |
23994631 | 3332 | { |
f96da094 | 3333 | const int size_default = sizeof(__u32); |
23994631 | 3334 | |
9bac3d6d AS |
3335 | if (off < 0 || off >= sizeof(struct __sk_buff)) |
3336 | return false; | |
62c7989b | 3337 | |
4936e352 | 3338 | /* The verifier guarantees that size > 0. */ |
9bac3d6d AS |
3339 | if (off % size != 0) |
3340 | return false; | |
62c7989b DB |
3341 | |
3342 | switch (off) { | |
f96da094 DB |
3343 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
3344 | if (off + size > offsetofend(struct __sk_buff, cb[4])) | |
62c7989b DB |
3345 | return false; |
3346 | break; | |
8a31db56 JF |
3347 | case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]): |
3348 | case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]): | |
3349 | case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4): | |
3350 | case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4): | |
f96da094 DB |
3351 | case bpf_ctx_range(struct __sk_buff, data): |
3352 | case bpf_ctx_range(struct __sk_buff, data_end): | |
3353 | if (size != size_default) | |
23994631 | 3354 | return false; |
31fd8581 YS |
3355 | break; |
3356 | default: | |
f96da094 | 3357 | /* Only narrow read access allowed for now. */ |
31fd8581 | 3358 | if (type == BPF_WRITE) { |
f96da094 | 3359 | if (size != size_default) |
31fd8581 YS |
3360 | return false; |
3361 | } else { | |
f96da094 DB |
3362 | bpf_ctx_record_field_size(info, size_default); |
3363 | if (!bpf_ctx_narrow_access_ok(off, size, size_default)) | |
23994631 | 3364 | return false; |
31fd8581 | 3365 | } |
62c7989b | 3366 | } |
9bac3d6d AS |
3367 | |
3368 | return true; | |
3369 | } | |
3370 | ||
d691f9e8 | 3371 | static bool sk_filter_is_valid_access(int off, int size, |
19de99f7 | 3372 | enum bpf_access_type type, |
23994631 | 3373 | struct bpf_insn_access_aux *info) |
d691f9e8 | 3374 | { |
db58ba45 | 3375 | switch (off) { |
f96da094 DB |
3376 | case bpf_ctx_range(struct __sk_buff, tc_classid): |
3377 | case bpf_ctx_range(struct __sk_buff, data): | |
3378 | case bpf_ctx_range(struct __sk_buff, data_end): | |
8a31db56 | 3379 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
045efa82 | 3380 | return false; |
db58ba45 | 3381 | } |
045efa82 | 3382 | |
d691f9e8 AS |
3383 | if (type == BPF_WRITE) { |
3384 | switch (off) { | |
f96da094 | 3385 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
d691f9e8 AS |
3386 | break; |
3387 | default: | |
3388 | return false; | |
3389 | } | |
3390 | } | |
3391 | ||
f96da094 | 3392 | return bpf_skb_is_valid_access(off, size, type, info); |
d691f9e8 AS |
3393 | } |
3394 | ||
3a0af8fd TG |
3395 | static bool lwt_is_valid_access(int off, int size, |
3396 | enum bpf_access_type type, | |
23994631 | 3397 | struct bpf_insn_access_aux *info) |
3a0af8fd TG |
3398 | { |
3399 | switch (off) { | |
f96da094 | 3400 | case bpf_ctx_range(struct __sk_buff, tc_classid): |
8a31db56 | 3401 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
3a0af8fd TG |
3402 | return false; |
3403 | } | |
3404 | ||
3405 | if (type == BPF_WRITE) { | |
3406 | switch (off) { | |
f96da094 DB |
3407 | case bpf_ctx_range(struct __sk_buff, mark): |
3408 | case bpf_ctx_range(struct __sk_buff, priority): | |
3409 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
3a0af8fd TG |
3410 | break; |
3411 | default: | |
3412 | return false; | |
3413 | } | |
3414 | } | |
3415 | ||
f96da094 DB |
3416 | switch (off) { |
3417 | case bpf_ctx_range(struct __sk_buff, data): | |
3418 | info->reg_type = PTR_TO_PACKET; | |
3419 | break; | |
3420 | case bpf_ctx_range(struct __sk_buff, data_end): | |
3421 | info->reg_type = PTR_TO_PACKET_END; | |
3422 | break; | |
3423 | } | |
3424 | ||
3425 | return bpf_skb_is_valid_access(off, size, type, info); | |
3a0af8fd TG |
3426 | } |
3427 | ||
61023658 DA |
3428 | static bool sock_filter_is_valid_access(int off, int size, |
3429 | enum bpf_access_type type, | |
23994631 | 3430 | struct bpf_insn_access_aux *info) |
61023658 DA |
3431 | { |
3432 | if (type == BPF_WRITE) { | |
3433 | switch (off) { | |
3434 | case offsetof(struct bpf_sock, bound_dev_if): | |
3435 | break; | |
3436 | default: | |
3437 | return false; | |
3438 | } | |
3439 | } | |
3440 | ||
3441 | if (off < 0 || off + size > sizeof(struct bpf_sock)) | |
3442 | return false; | |
61023658 DA |
3443 | /* The verifier guarantees that size > 0. */ |
3444 | if (off % size != 0) | |
3445 | return false; | |
61023658 DA |
3446 | if (size != sizeof(__u32)) |
3447 | return false; | |
3448 | ||
3449 | return true; | |
3450 | } | |
3451 | ||
047b0ecd DB |
3452 | static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, |
3453 | const struct bpf_prog *prog, int drop_verdict) | |
36bbef52 DB |
3454 | { |
3455 | struct bpf_insn *insn = insn_buf; | |
3456 | ||
3457 | if (!direct_write) | |
3458 | return 0; | |
3459 | ||
3460 | /* if (!skb->cloned) | |
3461 | * goto start; | |
3462 | * | |
3463 | * (Fast-path, otherwise approximation that we might be | |
3464 | * a clone, do the rest in helper.) | |
3465 | */ | |
3466 | *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET()); | |
3467 | *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); | |
3468 | *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); | |
3469 | ||
3470 | /* ret = bpf_skb_pull_data(skb, 0); */ | |
3471 | *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); | |
3472 | *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); | |
3473 | *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, | |
3474 | BPF_FUNC_skb_pull_data); | |
3475 | /* if (!ret) | |
3476 | * goto restore; | |
3477 | * return TC_ACT_SHOT; | |
3478 | */ | |
3479 | *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); | |
047b0ecd | 3480 | *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict); |
36bbef52 DB |
3481 | *insn++ = BPF_EXIT_INSN(); |
3482 | ||
3483 | /* restore: */ | |
3484 | *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); | |
3485 | /* start: */ | |
3486 | *insn++ = prog->insnsi[0]; | |
3487 | ||
3488 | return insn - insn_buf; | |
3489 | } | |
3490 | ||
047b0ecd DB |
3491 | static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, |
3492 | const struct bpf_prog *prog) | |
3493 | { | |
3494 | return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT); | |
3495 | } | |
3496 | ||
d691f9e8 | 3497 | static bool tc_cls_act_is_valid_access(int off, int size, |
19de99f7 | 3498 | enum bpf_access_type type, |
23994631 | 3499 | struct bpf_insn_access_aux *info) |
d691f9e8 AS |
3500 | { |
3501 | if (type == BPF_WRITE) { | |
3502 | switch (off) { | |
f96da094 DB |
3503 | case bpf_ctx_range(struct __sk_buff, mark): |
3504 | case bpf_ctx_range(struct __sk_buff, tc_index): | |
3505 | case bpf_ctx_range(struct __sk_buff, priority): | |
3506 | case bpf_ctx_range(struct __sk_buff, tc_classid): | |
3507 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
d691f9e8 AS |
3508 | break; |
3509 | default: | |
3510 | return false; | |
3511 | } | |
3512 | } | |
19de99f7 | 3513 | |
f96da094 DB |
3514 | switch (off) { |
3515 | case bpf_ctx_range(struct __sk_buff, data): | |
3516 | info->reg_type = PTR_TO_PACKET; | |
3517 | break; | |
3518 | case bpf_ctx_range(struct __sk_buff, data_end): | |
3519 | info->reg_type = PTR_TO_PACKET_END; | |
3520 | break; | |
8a31db56 JF |
3521 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
3522 | return false; | |
f96da094 DB |
3523 | } |
3524 | ||
3525 | return bpf_skb_is_valid_access(off, size, type, info); | |
d691f9e8 AS |
3526 | } |
3527 | ||
1afaf661 | 3528 | static bool __is_valid_xdp_access(int off, int size) |
6a773a15 BB |
3529 | { |
3530 | if (off < 0 || off >= sizeof(struct xdp_md)) | |
3531 | return false; | |
3532 | if (off % size != 0) | |
3533 | return false; | |
6088b582 | 3534 | if (size != sizeof(__u32)) |
6a773a15 BB |
3535 | return false; |
3536 | ||
3537 | return true; | |
3538 | } | |
3539 | ||
3540 | static bool xdp_is_valid_access(int off, int size, | |
3541 | enum bpf_access_type type, | |
23994631 | 3542 | struct bpf_insn_access_aux *info) |
6a773a15 BB |
3543 | { |
3544 | if (type == BPF_WRITE) | |
3545 | return false; | |
3546 | ||
3547 | switch (off) { | |
3548 | case offsetof(struct xdp_md, data): | |
23994631 | 3549 | info->reg_type = PTR_TO_PACKET; |
6a773a15 BB |
3550 | break; |
3551 | case offsetof(struct xdp_md, data_end): | |
23994631 | 3552 | info->reg_type = PTR_TO_PACKET_END; |
6a773a15 BB |
3553 | break; |
3554 | } | |
3555 | ||
1afaf661 | 3556 | return __is_valid_xdp_access(off, size); |
6a773a15 BB |
3557 | } |
3558 | ||
3559 | void bpf_warn_invalid_xdp_action(u32 act) | |
3560 | { | |
3561 | WARN_ONCE(1, "Illegal XDP return value %u, expect packet loss\n", act); | |
3562 | } | |
3563 | EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); | |
3564 | ||
40304b2a LB |
3565 | static bool __is_valid_sock_ops_access(int off, int size) |
3566 | { | |
3567 | if (off < 0 || off >= sizeof(struct bpf_sock_ops)) | |
3568 | return false; | |
3569 | /* The verifier guarantees that size > 0. */ | |
3570 | if (off % size != 0) | |
3571 | return false; | |
3572 | if (size != sizeof(__u32)) | |
3573 | return false; | |
3574 | ||
3575 | return true; | |
3576 | } | |
3577 | ||
3578 | static bool sock_ops_is_valid_access(int off, int size, | |
3579 | enum bpf_access_type type, | |
3580 | struct bpf_insn_access_aux *info) | |
3581 | { | |
3582 | if (type == BPF_WRITE) { | |
3583 | switch (off) { | |
3584 | case offsetof(struct bpf_sock_ops, op) ... | |
3585 | offsetof(struct bpf_sock_ops, replylong[3]): | |
3586 | break; | |
3587 | default: | |
3588 | return false; | |
3589 | } | |
3590 | } | |
3591 | ||
3592 | return __is_valid_sock_ops_access(off, size); | |
3593 | } | |
3594 | ||
8a31db56 JF |
3595 | static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write, |
3596 | const struct bpf_prog *prog) | |
3597 | { | |
047b0ecd | 3598 | return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP); |
8a31db56 JF |
3599 | } |
3600 | ||
b005fd18 JF |
3601 | static bool sk_skb_is_valid_access(int off, int size, |
3602 | enum bpf_access_type type, | |
3603 | struct bpf_insn_access_aux *info) | |
3604 | { | |
8a31db56 JF |
3605 | if (type == BPF_WRITE) { |
3606 | switch (off) { | |
3607 | case bpf_ctx_range(struct __sk_buff, mark): | |
3608 | case bpf_ctx_range(struct __sk_buff, tc_index): | |
3609 | case bpf_ctx_range(struct __sk_buff, priority): | |
3610 | break; | |
3611 | default: | |
3612 | return false; | |
3613 | } | |
3614 | } | |
3615 | ||
b005fd18 | 3616 | switch (off) { |
8a31db56 JF |
3617 | case bpf_ctx_range(struct __sk_buff, tc_classid): |
3618 | return false; | |
b005fd18 JF |
3619 | case bpf_ctx_range(struct __sk_buff, data): |
3620 | info->reg_type = PTR_TO_PACKET; | |
3621 | break; | |
3622 | case bpf_ctx_range(struct __sk_buff, data_end): | |
3623 | info->reg_type = PTR_TO_PACKET_END; | |
3624 | break; | |
3625 | } | |
3626 | ||
3627 | return bpf_skb_is_valid_access(off, size, type, info); | |
3628 | } | |
3629 | ||
2492d3b8 DB |
3630 | static u32 bpf_convert_ctx_access(enum bpf_access_type type, |
3631 | const struct bpf_insn *si, | |
3632 | struct bpf_insn *insn_buf, | |
f96da094 | 3633 | struct bpf_prog *prog, u32 *target_size) |
9bac3d6d AS |
3634 | { |
3635 | struct bpf_insn *insn = insn_buf; | |
6b8cc1d1 | 3636 | int off; |
9bac3d6d | 3637 | |
6b8cc1d1 | 3638 | switch (si->off) { |
9bac3d6d | 3639 | case offsetof(struct __sk_buff, len): |
6b8cc1d1 | 3640 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3641 | bpf_target_off(struct sk_buff, len, 4, |
3642 | target_size)); | |
9bac3d6d AS |
3643 | break; |
3644 | ||
0b8c707d | 3645 | case offsetof(struct __sk_buff, protocol): |
6b8cc1d1 | 3646 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
3647 | bpf_target_off(struct sk_buff, protocol, 2, |
3648 | target_size)); | |
0b8c707d DB |
3649 | break; |
3650 | ||
27cd5452 | 3651 | case offsetof(struct __sk_buff, vlan_proto): |
6b8cc1d1 | 3652 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
3653 | bpf_target_off(struct sk_buff, vlan_proto, 2, |
3654 | target_size)); | |
27cd5452 MS |
3655 | break; |
3656 | ||
bcad5718 | 3657 | case offsetof(struct __sk_buff, priority): |
754f1e6a | 3658 | if (type == BPF_WRITE) |
6b8cc1d1 | 3659 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3660 | bpf_target_off(struct sk_buff, priority, 4, |
3661 | target_size)); | |
754f1e6a | 3662 | else |
6b8cc1d1 | 3663 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3664 | bpf_target_off(struct sk_buff, priority, 4, |
3665 | target_size)); | |
bcad5718 DB |
3666 | break; |
3667 | ||
37e82c2f | 3668 | case offsetof(struct __sk_buff, ingress_ifindex): |
6b8cc1d1 | 3669 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3670 | bpf_target_off(struct sk_buff, skb_iif, 4, |
3671 | target_size)); | |
37e82c2f AS |
3672 | break; |
3673 | ||
3674 | case offsetof(struct __sk_buff, ifindex): | |
f035a515 | 3675 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
6b8cc1d1 | 3676 | si->dst_reg, si->src_reg, |
37e82c2f | 3677 | offsetof(struct sk_buff, dev)); |
6b8cc1d1 DB |
3678 | *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); |
3679 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
f96da094 DB |
3680 | bpf_target_off(struct net_device, ifindex, 4, |
3681 | target_size)); | |
37e82c2f AS |
3682 | break; |
3683 | ||
ba7591d8 | 3684 | case offsetof(struct __sk_buff, hash): |
6b8cc1d1 | 3685 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3686 | bpf_target_off(struct sk_buff, hash, 4, |
3687 | target_size)); | |
ba7591d8 DB |
3688 | break; |
3689 | ||
9bac3d6d | 3690 | case offsetof(struct __sk_buff, mark): |
d691f9e8 | 3691 | if (type == BPF_WRITE) |
6b8cc1d1 | 3692 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3693 | bpf_target_off(struct sk_buff, mark, 4, |
3694 | target_size)); | |
d691f9e8 | 3695 | else |
6b8cc1d1 | 3696 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3697 | bpf_target_off(struct sk_buff, mark, 4, |
3698 | target_size)); | |
d691f9e8 | 3699 | break; |
9bac3d6d AS |
3700 | |
3701 | case offsetof(struct __sk_buff, pkt_type): | |
f96da094 DB |
3702 | *target_size = 1; |
3703 | *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, | |
3704 | PKT_TYPE_OFFSET()); | |
3705 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); | |
3706 | #ifdef __BIG_ENDIAN_BITFIELD | |
3707 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); | |
3708 | #endif | |
3709 | break; | |
9bac3d6d AS |
3710 | |
3711 | case offsetof(struct __sk_buff, queue_mapping): | |
f96da094 DB |
3712 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
3713 | bpf_target_off(struct sk_buff, queue_mapping, 2, | |
3714 | target_size)); | |
3715 | break; | |
c2497395 | 3716 | |
c2497395 | 3717 | case offsetof(struct __sk_buff, vlan_present): |
c2497395 | 3718 | case offsetof(struct __sk_buff, vlan_tci): |
f96da094 DB |
3719 | BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000); |
3720 | ||
3721 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, | |
3722 | bpf_target_off(struct sk_buff, vlan_tci, 2, | |
3723 | target_size)); | |
3724 | if (si->off == offsetof(struct __sk_buff, vlan_tci)) { | |
3725 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, | |
3726 | ~VLAN_TAG_PRESENT); | |
3727 | } else { | |
3728 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 12); | |
3729 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1); | |
3730 | } | |
3731 | break; | |
d691f9e8 AS |
3732 | |
3733 | case offsetof(struct __sk_buff, cb[0]) ... | |
f96da094 | 3734 | offsetofend(struct __sk_buff, cb[4]) - 1: |
d691f9e8 | 3735 | BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, data) < 20); |
62c7989b DB |
3736 | BUILD_BUG_ON((offsetof(struct sk_buff, cb) + |
3737 | offsetof(struct qdisc_skb_cb, data)) % | |
3738 | sizeof(__u64)); | |
d691f9e8 | 3739 | |
ff936a04 | 3740 | prog->cb_access = 1; |
6b8cc1d1 DB |
3741 | off = si->off; |
3742 | off -= offsetof(struct __sk_buff, cb[0]); | |
3743 | off += offsetof(struct sk_buff, cb); | |
3744 | off += offsetof(struct qdisc_skb_cb, data); | |
d691f9e8 | 3745 | if (type == BPF_WRITE) |
62c7989b | 3746 | *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg, |
6b8cc1d1 | 3747 | si->src_reg, off); |
d691f9e8 | 3748 | else |
62c7989b | 3749 | *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, |
6b8cc1d1 | 3750 | si->src_reg, off); |
d691f9e8 AS |
3751 | break; |
3752 | ||
045efa82 | 3753 | case offsetof(struct __sk_buff, tc_classid): |
6b8cc1d1 DB |
3754 | BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, tc_classid) != 2); |
3755 | ||
3756 | off = si->off; | |
3757 | off -= offsetof(struct __sk_buff, tc_classid); | |
3758 | off += offsetof(struct sk_buff, cb); | |
3759 | off += offsetof(struct qdisc_skb_cb, tc_classid); | |
f96da094 | 3760 | *target_size = 2; |
09c37a2c | 3761 | if (type == BPF_WRITE) |
6b8cc1d1 DB |
3762 | *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, |
3763 | si->src_reg, off); | |
09c37a2c | 3764 | else |
6b8cc1d1 DB |
3765 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, |
3766 | si->src_reg, off); | |
045efa82 DB |
3767 | break; |
3768 | ||
db58ba45 | 3769 | case offsetof(struct __sk_buff, data): |
f035a515 | 3770 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), |
6b8cc1d1 | 3771 | si->dst_reg, si->src_reg, |
db58ba45 AS |
3772 | offsetof(struct sk_buff, data)); |
3773 | break; | |
3774 | ||
3775 | case offsetof(struct __sk_buff, data_end): | |
6b8cc1d1 DB |
3776 | off = si->off; |
3777 | off -= offsetof(struct __sk_buff, data_end); | |
3778 | off += offsetof(struct sk_buff, cb); | |
3779 | off += offsetof(struct bpf_skb_data_end, data_end); | |
3780 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
3781 | si->src_reg, off); | |
db58ba45 AS |
3782 | break; |
3783 | ||
d691f9e8 AS |
3784 | case offsetof(struct __sk_buff, tc_index): |
3785 | #ifdef CONFIG_NET_SCHED | |
d691f9e8 | 3786 | if (type == BPF_WRITE) |
6b8cc1d1 | 3787 | *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
3788 | bpf_target_off(struct sk_buff, tc_index, 2, |
3789 | target_size)); | |
d691f9e8 | 3790 | else |
6b8cc1d1 | 3791 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
3792 | bpf_target_off(struct sk_buff, tc_index, 2, |
3793 | target_size)); | |
d691f9e8 | 3794 | #else |
2ed46ce4 | 3795 | *target_size = 2; |
d691f9e8 | 3796 | if (type == BPF_WRITE) |
6b8cc1d1 | 3797 | *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); |
d691f9e8 | 3798 | else |
6b8cc1d1 | 3799 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
b1d9fc41 DB |
3800 | #endif |
3801 | break; | |
3802 | ||
3803 | case offsetof(struct __sk_buff, napi_id): | |
3804 | #if defined(CONFIG_NET_RX_BUSY_POLL) | |
b1d9fc41 | 3805 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
3806 | bpf_target_off(struct sk_buff, napi_id, 4, |
3807 | target_size)); | |
b1d9fc41 DB |
3808 | *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); |
3809 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); | |
3810 | #else | |
2ed46ce4 | 3811 | *target_size = 4; |
b1d9fc41 | 3812 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
d691f9e8 | 3813 | #endif |
6b8cc1d1 | 3814 | break; |
8a31db56 JF |
3815 | case offsetof(struct __sk_buff, family): |
3816 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); | |
3817 | ||
3818 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
3819 | si->dst_reg, si->src_reg, | |
3820 | offsetof(struct sk_buff, sk)); | |
3821 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
3822 | bpf_target_off(struct sock_common, | |
3823 | skc_family, | |
3824 | 2, target_size)); | |
3825 | break; | |
3826 | case offsetof(struct __sk_buff, remote_ip4): | |
3827 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); | |
3828 | ||
3829 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
3830 | si->dst_reg, si->src_reg, | |
3831 | offsetof(struct sk_buff, sk)); | |
3832 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
3833 | bpf_target_off(struct sock_common, | |
3834 | skc_daddr, | |
3835 | 4, target_size)); | |
3836 | break; | |
3837 | case offsetof(struct __sk_buff, local_ip4): | |
3838 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
3839 | skc_rcv_saddr) != 4); | |
3840 | ||
3841 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
3842 | si->dst_reg, si->src_reg, | |
3843 | offsetof(struct sk_buff, sk)); | |
3844 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
3845 | bpf_target_off(struct sock_common, | |
3846 | skc_rcv_saddr, | |
3847 | 4, target_size)); | |
3848 | break; | |
3849 | case offsetof(struct __sk_buff, remote_ip6[0]) ... | |
3850 | offsetof(struct __sk_buff, remote_ip6[3]): | |
3851 | #if IS_ENABLED(CONFIG_IPV6) | |
3852 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
3853 | skc_v6_daddr.s6_addr32[0]) != 4); | |
3854 | ||
3855 | off = si->off; | |
3856 | off -= offsetof(struct __sk_buff, remote_ip6[0]); | |
3857 | ||
3858 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
3859 | si->dst_reg, si->src_reg, | |
3860 | offsetof(struct sk_buff, sk)); | |
3861 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
3862 | offsetof(struct sock_common, | |
3863 | skc_v6_daddr.s6_addr32[0]) + | |
3864 | off); | |
3865 | #else | |
3866 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
3867 | #endif | |
3868 | break; | |
3869 | case offsetof(struct __sk_buff, local_ip6[0]) ... | |
3870 | offsetof(struct __sk_buff, local_ip6[3]): | |
3871 | #if IS_ENABLED(CONFIG_IPV6) | |
3872 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
3873 | skc_v6_rcv_saddr.s6_addr32[0]) != 4); | |
3874 | ||
3875 | off = si->off; | |
3876 | off -= offsetof(struct __sk_buff, local_ip6[0]); | |
3877 | ||
3878 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
3879 | si->dst_reg, si->src_reg, | |
3880 | offsetof(struct sk_buff, sk)); | |
3881 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
3882 | offsetof(struct sock_common, | |
3883 | skc_v6_rcv_saddr.s6_addr32[0]) + | |
3884 | off); | |
3885 | #else | |
3886 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
3887 | #endif | |
3888 | break; | |
3889 | ||
3890 | case offsetof(struct __sk_buff, remote_port): | |
3891 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); | |
3892 | ||
3893 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
3894 | si->dst_reg, si->src_reg, | |
3895 | offsetof(struct sk_buff, sk)); | |
3896 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
3897 | bpf_target_off(struct sock_common, | |
3898 | skc_dport, | |
3899 | 2, target_size)); | |
3900 | #ifndef __BIG_ENDIAN_BITFIELD | |
3901 | *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); | |
3902 | #endif | |
3903 | break; | |
3904 | ||
3905 | case offsetof(struct __sk_buff, local_port): | |
3906 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); | |
3907 | ||
3908 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
3909 | si->dst_reg, si->src_reg, | |
3910 | offsetof(struct sk_buff, sk)); | |
3911 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
3912 | bpf_target_off(struct sock_common, | |
3913 | skc_num, 2, target_size)); | |
3914 | break; | |
9bac3d6d AS |
3915 | } |
3916 | ||
3917 | return insn - insn_buf; | |
89aa0758 AS |
3918 | } |
3919 | ||
61023658 | 3920 | static u32 sock_filter_convert_ctx_access(enum bpf_access_type type, |
6b8cc1d1 | 3921 | const struct bpf_insn *si, |
61023658 | 3922 | struct bpf_insn *insn_buf, |
f96da094 | 3923 | struct bpf_prog *prog, u32 *target_size) |
61023658 DA |
3924 | { |
3925 | struct bpf_insn *insn = insn_buf; | |
3926 | ||
6b8cc1d1 | 3927 | switch (si->off) { |
61023658 DA |
3928 | case offsetof(struct bpf_sock, bound_dev_if): |
3929 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_bound_dev_if) != 4); | |
3930 | ||
3931 | if (type == BPF_WRITE) | |
6b8cc1d1 | 3932 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
61023658 DA |
3933 | offsetof(struct sock, sk_bound_dev_if)); |
3934 | else | |
6b8cc1d1 | 3935 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
61023658 DA |
3936 | offsetof(struct sock, sk_bound_dev_if)); |
3937 | break; | |
aa4c1037 DA |
3938 | |
3939 | case offsetof(struct bpf_sock, family): | |
3940 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_family) != 2); | |
3941 | ||
6b8cc1d1 | 3942 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
aa4c1037 DA |
3943 | offsetof(struct sock, sk_family)); |
3944 | break; | |
3945 | ||
3946 | case offsetof(struct bpf_sock, type): | |
6b8cc1d1 | 3947 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
aa4c1037 | 3948 | offsetof(struct sock, __sk_flags_offset)); |
6b8cc1d1 DB |
3949 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK); |
3950 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT); | |
aa4c1037 DA |
3951 | break; |
3952 | ||
3953 | case offsetof(struct bpf_sock, protocol): | |
6b8cc1d1 | 3954 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
aa4c1037 | 3955 | offsetof(struct sock, __sk_flags_offset)); |
6b8cc1d1 DB |
3956 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK); |
3957 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_PROTO_SHIFT); | |
aa4c1037 | 3958 | break; |
61023658 DA |
3959 | } |
3960 | ||
3961 | return insn - insn_buf; | |
3962 | } | |
3963 | ||
6b8cc1d1 DB |
3964 | static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, |
3965 | const struct bpf_insn *si, | |
374fb54e | 3966 | struct bpf_insn *insn_buf, |
f96da094 | 3967 | struct bpf_prog *prog, u32 *target_size) |
374fb54e DB |
3968 | { |
3969 | struct bpf_insn *insn = insn_buf; | |
3970 | ||
6b8cc1d1 | 3971 | switch (si->off) { |
374fb54e | 3972 | case offsetof(struct __sk_buff, ifindex): |
374fb54e | 3973 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
6b8cc1d1 | 3974 | si->dst_reg, si->src_reg, |
374fb54e | 3975 | offsetof(struct sk_buff, dev)); |
6b8cc1d1 | 3976 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
f96da094 DB |
3977 | bpf_target_off(struct net_device, ifindex, 4, |
3978 | target_size)); | |
374fb54e DB |
3979 | break; |
3980 | default: | |
f96da094 DB |
3981 | return bpf_convert_ctx_access(type, si, insn_buf, prog, |
3982 | target_size); | |
374fb54e DB |
3983 | } |
3984 | ||
3985 | return insn - insn_buf; | |
3986 | } | |
3987 | ||
6b8cc1d1 DB |
3988 | static u32 xdp_convert_ctx_access(enum bpf_access_type type, |
3989 | const struct bpf_insn *si, | |
6a773a15 | 3990 | struct bpf_insn *insn_buf, |
f96da094 | 3991 | struct bpf_prog *prog, u32 *target_size) |
6a773a15 BB |
3992 | { |
3993 | struct bpf_insn *insn = insn_buf; | |
3994 | ||
6b8cc1d1 | 3995 | switch (si->off) { |
6a773a15 | 3996 | case offsetof(struct xdp_md, data): |
f035a515 | 3997 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), |
6b8cc1d1 | 3998 | si->dst_reg, si->src_reg, |
6a773a15 BB |
3999 | offsetof(struct xdp_buff, data)); |
4000 | break; | |
4001 | case offsetof(struct xdp_md, data_end): | |
f035a515 | 4002 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), |
6b8cc1d1 | 4003 | si->dst_reg, si->src_reg, |
6a773a15 BB |
4004 | offsetof(struct xdp_buff, data_end)); |
4005 | break; | |
4006 | } | |
4007 | ||
4008 | return insn - insn_buf; | |
4009 | } | |
4010 | ||
40304b2a LB |
4011 | static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, |
4012 | const struct bpf_insn *si, | |
4013 | struct bpf_insn *insn_buf, | |
f96da094 DB |
4014 | struct bpf_prog *prog, |
4015 | u32 *target_size) | |
40304b2a LB |
4016 | { |
4017 | struct bpf_insn *insn = insn_buf; | |
4018 | int off; | |
4019 | ||
4020 | switch (si->off) { | |
4021 | case offsetof(struct bpf_sock_ops, op) ... | |
4022 | offsetof(struct bpf_sock_ops, replylong[3]): | |
4023 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, op) != | |
4024 | FIELD_SIZEOF(struct bpf_sock_ops_kern, op)); | |
4025 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, reply) != | |
4026 | FIELD_SIZEOF(struct bpf_sock_ops_kern, reply)); | |
4027 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, replylong) != | |
4028 | FIELD_SIZEOF(struct bpf_sock_ops_kern, replylong)); | |
4029 | off = si->off; | |
4030 | off -= offsetof(struct bpf_sock_ops, op); | |
4031 | off += offsetof(struct bpf_sock_ops_kern, op); | |
4032 | if (type == BPF_WRITE) | |
4033 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
4034 | off); | |
4035 | else | |
4036 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
4037 | off); | |
4038 | break; | |
4039 | ||
4040 | case offsetof(struct bpf_sock_ops, family): | |
4041 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); | |
4042 | ||
4043 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
4044 | struct bpf_sock_ops_kern, sk), | |
4045 | si->dst_reg, si->src_reg, | |
4046 | offsetof(struct bpf_sock_ops_kern, sk)); | |
4047 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
4048 | offsetof(struct sock_common, skc_family)); | |
4049 | break; | |
4050 | ||
4051 | case offsetof(struct bpf_sock_ops, remote_ip4): | |
4052 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); | |
4053 | ||
4054 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
4055 | struct bpf_sock_ops_kern, sk), | |
4056 | si->dst_reg, si->src_reg, | |
4057 | offsetof(struct bpf_sock_ops_kern, sk)); | |
4058 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
4059 | offsetof(struct sock_common, skc_daddr)); | |
4060 | break; | |
4061 | ||
4062 | case offsetof(struct bpf_sock_ops, local_ip4): | |
4063 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_rcv_saddr) != 4); | |
4064 | ||
4065 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
4066 | struct bpf_sock_ops_kern, sk), | |
4067 | si->dst_reg, si->src_reg, | |
4068 | offsetof(struct bpf_sock_ops_kern, sk)); | |
4069 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
4070 | offsetof(struct sock_common, | |
4071 | skc_rcv_saddr)); | |
4072 | break; | |
4073 | ||
4074 | case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... | |
4075 | offsetof(struct bpf_sock_ops, remote_ip6[3]): | |
4076 | #if IS_ENABLED(CONFIG_IPV6) | |
4077 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
4078 | skc_v6_daddr.s6_addr32[0]) != 4); | |
4079 | ||
4080 | off = si->off; | |
4081 | off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); | |
4082 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
4083 | struct bpf_sock_ops_kern, sk), | |
4084 | si->dst_reg, si->src_reg, | |
4085 | offsetof(struct bpf_sock_ops_kern, sk)); | |
4086 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
4087 | offsetof(struct sock_common, | |
4088 | skc_v6_daddr.s6_addr32[0]) + | |
4089 | off); | |
4090 | #else | |
4091 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
4092 | #endif | |
4093 | break; | |
4094 | ||
4095 | case offsetof(struct bpf_sock_ops, local_ip6[0]) ... | |
4096 | offsetof(struct bpf_sock_ops, local_ip6[3]): | |
4097 | #if IS_ENABLED(CONFIG_IPV6) | |
4098 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
4099 | skc_v6_rcv_saddr.s6_addr32[0]) != 4); | |
4100 | ||
4101 | off = si->off; | |
4102 | off -= offsetof(struct bpf_sock_ops, local_ip6[0]); | |
4103 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
4104 | struct bpf_sock_ops_kern, sk), | |
4105 | si->dst_reg, si->src_reg, | |
4106 | offsetof(struct bpf_sock_ops_kern, sk)); | |
4107 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
4108 | offsetof(struct sock_common, | |
4109 | skc_v6_rcv_saddr.s6_addr32[0]) + | |
4110 | off); | |
4111 | #else | |
4112 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
4113 | #endif | |
4114 | break; | |
4115 | ||
4116 | case offsetof(struct bpf_sock_ops, remote_port): | |
4117 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); | |
4118 | ||
4119 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
4120 | struct bpf_sock_ops_kern, sk), | |
4121 | si->dst_reg, si->src_reg, | |
4122 | offsetof(struct bpf_sock_ops_kern, sk)); | |
4123 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
4124 | offsetof(struct sock_common, skc_dport)); | |
4125 | #ifndef __BIG_ENDIAN_BITFIELD | |
4126 | *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); | |
4127 | #endif | |
4128 | break; | |
4129 | ||
4130 | case offsetof(struct bpf_sock_ops, local_port): | |
4131 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); | |
4132 | ||
4133 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
4134 | struct bpf_sock_ops_kern, sk), | |
4135 | si->dst_reg, si->src_reg, | |
4136 | offsetof(struct bpf_sock_ops_kern, sk)); | |
4137 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
4138 | offsetof(struct sock_common, skc_num)); | |
4139 | break; | |
4140 | } | |
4141 | return insn - insn_buf; | |
4142 | } | |
4143 | ||
be9370a7 | 4144 | const struct bpf_verifier_ops sk_filter_prog_ops = { |
4936e352 DB |
4145 | .get_func_proto = sk_filter_func_proto, |
4146 | .is_valid_access = sk_filter_is_valid_access, | |
2492d3b8 | 4147 | .convert_ctx_access = bpf_convert_ctx_access, |
89aa0758 AS |
4148 | }; |
4149 | ||
be9370a7 | 4150 | const struct bpf_verifier_ops tc_cls_act_prog_ops = { |
4936e352 DB |
4151 | .get_func_proto = tc_cls_act_func_proto, |
4152 | .is_valid_access = tc_cls_act_is_valid_access, | |
374fb54e | 4153 | .convert_ctx_access = tc_cls_act_convert_ctx_access, |
36bbef52 | 4154 | .gen_prologue = tc_cls_act_prologue, |
1cf1cae9 | 4155 | .test_run = bpf_prog_test_run_skb, |
608cd71a AS |
4156 | }; |
4157 | ||
be9370a7 | 4158 | const struct bpf_verifier_ops xdp_prog_ops = { |
6a773a15 BB |
4159 | .get_func_proto = xdp_func_proto, |
4160 | .is_valid_access = xdp_is_valid_access, | |
4161 | .convert_ctx_access = xdp_convert_ctx_access, | |
1cf1cae9 | 4162 | .test_run = bpf_prog_test_run_xdp, |
6a773a15 BB |
4163 | }; |
4164 | ||
be9370a7 | 4165 | const struct bpf_verifier_ops cg_skb_prog_ops = { |
966789fb | 4166 | .get_func_proto = sk_filter_func_proto, |
0e33661d | 4167 | .is_valid_access = sk_filter_is_valid_access, |
2492d3b8 | 4168 | .convert_ctx_access = bpf_convert_ctx_access, |
1cf1cae9 | 4169 | .test_run = bpf_prog_test_run_skb, |
0e33661d DM |
4170 | }; |
4171 | ||
be9370a7 | 4172 | const struct bpf_verifier_ops lwt_inout_prog_ops = { |
3a0af8fd TG |
4173 | .get_func_proto = lwt_inout_func_proto, |
4174 | .is_valid_access = lwt_is_valid_access, | |
2492d3b8 | 4175 | .convert_ctx_access = bpf_convert_ctx_access, |
1cf1cae9 | 4176 | .test_run = bpf_prog_test_run_skb, |
3a0af8fd TG |
4177 | }; |
4178 | ||
be9370a7 | 4179 | const struct bpf_verifier_ops lwt_xmit_prog_ops = { |
3a0af8fd TG |
4180 | .get_func_proto = lwt_xmit_func_proto, |
4181 | .is_valid_access = lwt_is_valid_access, | |
2492d3b8 | 4182 | .convert_ctx_access = bpf_convert_ctx_access, |
3a0af8fd | 4183 | .gen_prologue = tc_cls_act_prologue, |
1cf1cae9 | 4184 | .test_run = bpf_prog_test_run_skb, |
3a0af8fd TG |
4185 | }; |
4186 | ||
be9370a7 | 4187 | const struct bpf_verifier_ops cg_sock_prog_ops = { |
2492d3b8 | 4188 | .get_func_proto = bpf_base_func_proto, |
61023658 DA |
4189 | .is_valid_access = sock_filter_is_valid_access, |
4190 | .convert_ctx_access = sock_filter_convert_ctx_access, | |
4191 | }; | |
4192 | ||
40304b2a | 4193 | const struct bpf_verifier_ops sock_ops_prog_ops = { |
8c4b4c7e | 4194 | .get_func_proto = sock_ops_func_proto, |
40304b2a LB |
4195 | .is_valid_access = sock_ops_is_valid_access, |
4196 | .convert_ctx_access = sock_ops_convert_ctx_access, | |
4197 | }; | |
4198 | ||
b005fd18 JF |
4199 | const struct bpf_verifier_ops sk_skb_prog_ops = { |
4200 | .get_func_proto = sk_skb_func_proto, | |
4201 | .is_valid_access = sk_skb_is_valid_access, | |
4202 | .convert_ctx_access = bpf_convert_ctx_access, | |
8a31db56 | 4203 | .gen_prologue = sk_skb_prologue, |
b005fd18 JF |
4204 | }; |
4205 | ||
8ced425e | 4206 | int sk_detach_filter(struct sock *sk) |
55b33325 PE |
4207 | { |
4208 | int ret = -ENOENT; | |
4209 | struct sk_filter *filter; | |
4210 | ||
d59577b6 VB |
4211 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
4212 | return -EPERM; | |
4213 | ||
8ced425e HFS |
4214 | filter = rcu_dereference_protected(sk->sk_filter, |
4215 | lockdep_sock_is_held(sk)); | |
55b33325 | 4216 | if (filter) { |
a9b3cd7f | 4217 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
46bcf14f | 4218 | sk_filter_uncharge(sk, filter); |
55b33325 PE |
4219 | ret = 0; |
4220 | } | |
a3ea269b | 4221 | |
55b33325 PE |
4222 | return ret; |
4223 | } | |
8ced425e | 4224 | EXPORT_SYMBOL_GPL(sk_detach_filter); |
a8fc9277 | 4225 | |
a3ea269b DB |
4226 | int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf, |
4227 | unsigned int len) | |
a8fc9277 | 4228 | { |
a3ea269b | 4229 | struct sock_fprog_kern *fprog; |
a8fc9277 | 4230 | struct sk_filter *filter; |
a3ea269b | 4231 | int ret = 0; |
a8fc9277 PE |
4232 | |
4233 | lock_sock(sk); | |
4234 | filter = rcu_dereference_protected(sk->sk_filter, | |
8ced425e | 4235 | lockdep_sock_is_held(sk)); |
a8fc9277 PE |
4236 | if (!filter) |
4237 | goto out; | |
a3ea269b DB |
4238 | |
4239 | /* We're copying the filter that has been originally attached, | |
93d08b69 DB |
4240 | * so no conversion/decode needed anymore. eBPF programs that |
4241 | * have no original program cannot be dumped through this. | |
a3ea269b | 4242 | */ |
93d08b69 | 4243 | ret = -EACCES; |
7ae457c1 | 4244 | fprog = filter->prog->orig_prog; |
93d08b69 DB |
4245 | if (!fprog) |
4246 | goto out; | |
a3ea269b DB |
4247 | |
4248 | ret = fprog->len; | |
a8fc9277 | 4249 | if (!len) |
a3ea269b | 4250 | /* User space only enquires number of filter blocks. */ |
a8fc9277 | 4251 | goto out; |
a3ea269b | 4252 | |
a8fc9277 | 4253 | ret = -EINVAL; |
a3ea269b | 4254 | if (len < fprog->len) |
a8fc9277 PE |
4255 | goto out; |
4256 | ||
4257 | ret = -EFAULT; | |
009937e7 | 4258 | if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog))) |
a3ea269b | 4259 | goto out; |
a8fc9277 | 4260 | |
a3ea269b DB |
4261 | /* Instead of bytes, the API requests to return the number |
4262 | * of filter blocks. | |
4263 | */ | |
4264 | ret = fprog->len; | |
a8fc9277 PE |
4265 | out: |
4266 | release_sock(sk); | |
4267 | return ret; | |
4268 | } |