2 * Linux Socket Filter - Kernel level socket filtering
4 * Based on the design of the Berkeley Packet Filter. The new
5 * internal format has been designed by PLUMgrid:
7 * Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com
11 * Jay Schulist <jschlst@samba.org>
12 * Alexei Starovoitov <ast@plumgrid.com>
13 * Daniel Borkmann <dborkman@redhat.com>
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.
20 * Andi Kleen - Fix a few bad bugs and races.
21 * Kris Katterjohn - Added many additional checks in bpf_check_classic()
24 #include <linux/module.h>
25 #include <linux/types.h>
27 #include <linux/fcntl.h>
28 #include <linux/socket.h>
29 #include <linux/sock_diag.h>
31 #include <linux/inet.h>
32 #include <linux/netdevice.h>
33 #include <linux/if_packet.h>
34 #include <linux/if_arp.h>
35 #include <linux/gfp.h>
37 #include <net/protocol.h>
38 #include <net/netlink.h>
39 #include <linux/skbuff.h>
41 #include <net/flow_dissector.h>
42 #include <linux/errno.h>
43 #include <linux/timer.h>
44 #include <linux/uaccess.h>
45 #include <asm/unaligned.h>
46 #include <asm/cmpxchg.h>
47 #include <linux/filter.h>
48 #include <linux/ratelimit.h>
49 #include <linux/seccomp.h>
50 #include <linux/if_vlan.h>
51 #include <linux/bpf.h>
52 #include <net/sch_generic.h>
53 #include <net/cls_cgroup.h>
54 #include <net/dst_metadata.h>
56 #include <net/sock_reuseport.h>
57 #include <net/busy_poll.h>
59 #include <linux/bpf_trace.h>
62 * sk_filter_trim_cap - run a packet through a socket filter
63 * @sk: sock associated with &sk_buff
64 * @skb: buffer to filter
65 * @cap: limit on how short the eBPF program may trim the packet
67 * Run the eBPF program and then cut skb->data to correct size returned by
68 * the program. If pkt_len is 0 we toss packet. If skb->len is smaller
69 * than pkt_len we keep whole skb->data. This is the socket level
70 * wrapper to BPF_PROG_RUN. It returns 0 if the packet should
71 * be accepted or -EPERM if the packet should be tossed.
74 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap)
77 struct sk_filter *filter;
80 * If the skb was allocated from pfmemalloc reserves, only
81 * allow SOCK_MEMALLOC sockets to use it as this socket is
84 if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) {
85 NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP);
88 err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb);
92 err = security_sock_rcv_skb(sk, skb);
97 filter = rcu_dereference(sk->sk_filter);
99 struct sock *save_sk = skb->sk;
100 unsigned int pkt_len;
103 pkt_len = bpf_prog_run_save_cb(filter->prog, skb);
105 err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM;
111 EXPORT_SYMBOL(sk_filter_trim_cap);
113 BPF_CALL_1(__skb_get_pay_offset, struct sk_buff *, skb)
115 return skb_get_poff(skb);
118 BPF_CALL_3(__skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x)
122 if (skb_is_nonlinear(skb))
125 if (skb->len < sizeof(struct nlattr))
128 if (a > skb->len - sizeof(struct nlattr))
131 nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x);
133 return (void *) nla - (void *) skb->data;
138 BPF_CALL_3(__skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x)
142 if (skb_is_nonlinear(skb))
145 if (skb->len < sizeof(struct nlattr))
148 if (a > skb->len - sizeof(struct nlattr))
151 nla = (struct nlattr *) &skb->data[a];
152 if (nla->nla_len > skb->len - a)
155 nla = nla_find_nested(nla, x);
157 return (void *) nla - (void *) skb->data;
162 BPF_CALL_0(__get_raw_cpu_id)
164 return raw_smp_processor_id();
167 static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = {
168 .func = __get_raw_cpu_id,
170 .ret_type = RET_INTEGER,
173 static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg,
174 struct bpf_insn *insn_buf)
176 struct bpf_insn *insn = insn_buf;
180 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, mark) != 4);
182 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg,
183 offsetof(struct sk_buff, mark));
187 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET());
188 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX);
189 #ifdef __BIG_ENDIAN_BITFIELD
190 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5);
195 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, queue_mapping) != 2);
197 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
198 offsetof(struct sk_buff, queue_mapping));
201 case SKF_AD_VLAN_TAG:
202 case SKF_AD_VLAN_TAG_PRESENT:
203 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2);
204 BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000);
206 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */
207 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
208 offsetof(struct sk_buff, vlan_tci));
209 if (skb_field == SKF_AD_VLAN_TAG) {
210 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg,
214 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 12);
216 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1);
221 return insn - insn_buf;
224 static bool convert_bpf_extensions(struct sock_filter *fp,
225 struct bpf_insn **insnp)
227 struct bpf_insn *insn = *insnp;
231 case SKF_AD_OFF + SKF_AD_PROTOCOL:
232 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, protocol) != 2);
234 /* A = *(u16 *) (CTX + offsetof(protocol)) */
235 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX,
236 offsetof(struct sk_buff, protocol));
237 /* A = ntohs(A) [emitting a nop or swap16] */
238 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16);
241 case SKF_AD_OFF + SKF_AD_PKTTYPE:
242 cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn);
246 case SKF_AD_OFF + SKF_AD_IFINDEX:
247 case SKF_AD_OFF + SKF_AD_HATYPE:
248 BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, ifindex) != 4);
249 BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, type) != 2);
251 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
252 BPF_REG_TMP, BPF_REG_CTX,
253 offsetof(struct sk_buff, dev));
254 /* if (tmp != 0) goto pc + 1 */
255 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1);
256 *insn++ = BPF_EXIT_INSN();
257 if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX)
258 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP,
259 offsetof(struct net_device, ifindex));
261 *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP,
262 offsetof(struct net_device, type));
265 case SKF_AD_OFF + SKF_AD_MARK:
266 cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn);
270 case SKF_AD_OFF + SKF_AD_RXHASH:
271 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, hash) != 4);
273 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX,
274 offsetof(struct sk_buff, hash));
277 case SKF_AD_OFF + SKF_AD_QUEUE:
278 cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn);
282 case SKF_AD_OFF + SKF_AD_VLAN_TAG:
283 cnt = convert_skb_access(SKF_AD_VLAN_TAG,
284 BPF_REG_A, BPF_REG_CTX, insn);
288 case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT:
289 cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT,
290 BPF_REG_A, BPF_REG_CTX, insn);
294 case SKF_AD_OFF + SKF_AD_VLAN_TPID:
295 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_proto) != 2);
297 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */
298 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX,
299 offsetof(struct sk_buff, vlan_proto));
300 /* A = ntohs(A) [emitting a nop or swap16] */
301 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16);
304 case SKF_AD_OFF + SKF_AD_PAY_OFFSET:
305 case SKF_AD_OFF + SKF_AD_NLATTR:
306 case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
307 case SKF_AD_OFF + SKF_AD_CPU:
308 case SKF_AD_OFF + SKF_AD_RANDOM:
310 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX);
312 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A);
314 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X);
315 /* Emit call(arg1=CTX, arg2=A, arg3=X) */
317 case SKF_AD_OFF + SKF_AD_PAY_OFFSET:
318 *insn = BPF_EMIT_CALL(__skb_get_pay_offset);
320 case SKF_AD_OFF + SKF_AD_NLATTR:
321 *insn = BPF_EMIT_CALL(__skb_get_nlattr);
323 case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
324 *insn = BPF_EMIT_CALL(__skb_get_nlattr_nest);
326 case SKF_AD_OFF + SKF_AD_CPU:
327 *insn = BPF_EMIT_CALL(__get_raw_cpu_id);
329 case SKF_AD_OFF + SKF_AD_RANDOM:
330 *insn = BPF_EMIT_CALL(bpf_user_rnd_u32);
331 bpf_user_rnd_init_once();
336 case SKF_AD_OFF + SKF_AD_ALU_XOR_X:
338 *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X);
342 /* This is just a dummy call to avoid letting the compiler
343 * evict __bpf_call_base() as an optimization. Placed here
344 * where no-one bothers.
346 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0);
355 * bpf_convert_filter - convert filter program
356 * @prog: the user passed filter program
357 * @len: the length of the user passed filter program
358 * @new_prog: allocated 'struct bpf_prog' or NULL
359 * @new_len: pointer to store length of converted program
361 * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn'
362 * style extended BPF (eBPF).
363 * Conversion workflow:
365 * 1) First pass for calculating the new program length:
366 * bpf_convert_filter(old_prog, old_len, NULL, &new_len)
368 * 2) 2nd pass to remap in two passes: 1st pass finds new
369 * jump offsets, 2nd pass remapping:
370 * bpf_convert_filter(old_prog, old_len, new_prog, &new_len);
372 static int bpf_convert_filter(struct sock_filter *prog, int len,
373 struct bpf_prog *new_prog, int *new_len)
375 int new_flen = 0, pass = 0, target, i, stack_off;
376 struct bpf_insn *new_insn, *first_insn = NULL;
377 struct sock_filter *fp;
381 BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK);
382 BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG);
384 if (len <= 0 || len > BPF_MAXINSNS)
388 first_insn = new_prog->insnsi;
389 addrs = kcalloc(len, sizeof(*addrs),
390 GFP_KERNEL | __GFP_NOWARN);
396 new_insn = first_insn;
399 /* Classic BPF related prologue emission. */
401 /* Classic BPF expects A and X to be reset first. These need
402 * to be guaranteed to be the first two instructions.
404 *new_insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
405 *new_insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_X, BPF_REG_X);
407 /* All programs must keep CTX in callee saved BPF_REG_CTX.
408 * In eBPF case it's done by the compiler, here we need to
409 * do this ourself. Initial CTX is present in BPF_REG_ARG1.
411 *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1);
416 for (i = 0; i < len; fp++, i++) {
417 struct bpf_insn tmp_insns[6] = { };
418 struct bpf_insn *insn = tmp_insns;
421 addrs[i] = new_insn - first_insn;
424 /* All arithmetic insns and skb loads map as-is. */
425 case BPF_ALU | BPF_ADD | BPF_X:
426 case BPF_ALU | BPF_ADD | BPF_K:
427 case BPF_ALU | BPF_SUB | BPF_X:
428 case BPF_ALU | BPF_SUB | BPF_K:
429 case BPF_ALU | BPF_AND | BPF_X:
430 case BPF_ALU | BPF_AND | BPF_K:
431 case BPF_ALU | BPF_OR | BPF_X:
432 case BPF_ALU | BPF_OR | BPF_K:
433 case BPF_ALU | BPF_LSH | BPF_X:
434 case BPF_ALU | BPF_LSH | BPF_K:
435 case BPF_ALU | BPF_RSH | BPF_X:
436 case BPF_ALU | BPF_RSH | BPF_K:
437 case BPF_ALU | BPF_XOR | BPF_X:
438 case BPF_ALU | BPF_XOR | BPF_K:
439 case BPF_ALU | BPF_MUL | BPF_X:
440 case BPF_ALU | BPF_MUL | BPF_K:
441 case BPF_ALU | BPF_DIV | BPF_X:
442 case BPF_ALU | BPF_DIV | BPF_K:
443 case BPF_ALU | BPF_MOD | BPF_X:
444 case BPF_ALU | BPF_MOD | BPF_K:
445 case BPF_ALU | BPF_NEG:
446 case BPF_LD | BPF_ABS | BPF_W:
447 case BPF_LD | BPF_ABS | BPF_H:
448 case BPF_LD | BPF_ABS | BPF_B:
449 case BPF_LD | BPF_IND | BPF_W:
450 case BPF_LD | BPF_IND | BPF_H:
451 case BPF_LD | BPF_IND | BPF_B:
452 /* Check for overloaded BPF extension and
453 * directly convert it if found, otherwise
454 * just move on with mapping.
456 if (BPF_CLASS(fp->code) == BPF_LD &&
457 BPF_MODE(fp->code) == BPF_ABS &&
458 convert_bpf_extensions(fp, &insn))
461 *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k);
464 /* Jump transformation cannot use BPF block macros
465 * everywhere as offset calculation and target updates
466 * require a bit more work than the rest, i.e. jump
467 * opcodes map as-is, but offsets need adjustment.
470 #define BPF_EMIT_JMP \
472 if (target >= len || target < 0) \
474 insn->off = addrs ? addrs[target] - addrs[i] - 1 : 0; \
475 /* Adjust pc relative offset for 2nd or 3rd insn. */ \
476 insn->off -= insn - tmp_insns; \
479 case BPF_JMP | BPF_JA:
480 target = i + fp->k + 1;
481 insn->code = fp->code;
485 case BPF_JMP | BPF_JEQ | BPF_K:
486 case BPF_JMP | BPF_JEQ | BPF_X:
487 case BPF_JMP | BPF_JSET | BPF_K:
488 case BPF_JMP | BPF_JSET | BPF_X:
489 case BPF_JMP | BPF_JGT | BPF_K:
490 case BPF_JMP | BPF_JGT | BPF_X:
491 case BPF_JMP | BPF_JGE | BPF_K:
492 case BPF_JMP | BPF_JGE | BPF_X:
493 if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) {
494 /* BPF immediates are signed, zero extend
495 * immediate into tmp register and use it
498 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k);
500 insn->dst_reg = BPF_REG_A;
501 insn->src_reg = BPF_REG_TMP;
504 insn->dst_reg = BPF_REG_A;
506 bpf_src = BPF_SRC(fp->code);
507 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0;
510 /* Common case where 'jump_false' is next insn. */
512 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
513 target = i + fp->jt + 1;
518 /* Convert some jumps when 'jump_true' is next insn. */
520 switch (BPF_OP(fp->code)) {
522 insn->code = BPF_JMP | BPF_JNE | bpf_src;
525 insn->code = BPF_JMP | BPF_JLE | bpf_src;
528 insn->code = BPF_JMP | BPF_JLT | bpf_src;
534 target = i + fp->jf + 1;
539 /* Other jumps are mapped into two insns: Jxx and JA. */
540 target = i + fp->jt + 1;
541 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
545 insn->code = BPF_JMP | BPF_JA;
546 target = i + fp->jf + 1;
550 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */
551 case BPF_LDX | BPF_MSH | BPF_B:
553 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_A);
554 /* A = BPF_R0 = *(u8 *) (skb->data + K) */
555 *insn++ = BPF_LD_ABS(BPF_B, fp->k);
557 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf);
559 *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2);
561 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
563 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP);
566 /* RET_K is remaped into 2 insns. RET_A case doesn't need an
567 * extra mov as BPF_REG_0 is already mapped into BPF_REG_A.
569 case BPF_RET | BPF_A:
570 case BPF_RET | BPF_K:
571 if (BPF_RVAL(fp->code) == BPF_K)
572 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0,
574 *insn = BPF_EXIT_INSN();
577 /* Store to stack. */
580 stack_off = fp->k * 4 + 4;
581 *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) ==
582 BPF_ST ? BPF_REG_A : BPF_REG_X,
584 /* check_load_and_stores() verifies that classic BPF can
585 * load from stack only after write, so tracking
586 * stack_depth for ST|STX insns is enough
588 if (new_prog && new_prog->aux->stack_depth < stack_off)
589 new_prog->aux->stack_depth = stack_off;
592 /* Load from stack. */
593 case BPF_LD | BPF_MEM:
594 case BPF_LDX | BPF_MEM:
595 stack_off = fp->k * 4 + 4;
596 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ?
597 BPF_REG_A : BPF_REG_X, BPF_REG_FP,
602 case BPF_LD | BPF_IMM:
603 case BPF_LDX | BPF_IMM:
604 *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ?
605 BPF_REG_A : BPF_REG_X, fp->k);
609 case BPF_MISC | BPF_TAX:
610 *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
614 case BPF_MISC | BPF_TXA:
615 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X);
618 /* A = skb->len or X = skb->len */
619 case BPF_LD | BPF_W | BPF_LEN:
620 case BPF_LDX | BPF_W | BPF_LEN:
621 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ?
622 BPF_REG_A : BPF_REG_X, BPF_REG_CTX,
623 offsetof(struct sk_buff, len));
626 /* Access seccomp_data fields. */
627 case BPF_LDX | BPF_ABS | BPF_W:
628 /* A = *(u32 *) (ctx + K) */
629 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k);
632 /* Unknown instruction. */
639 memcpy(new_insn, tmp_insns,
640 sizeof(*insn) * (insn - tmp_insns));
641 new_insn += insn - tmp_insns;
645 /* Only calculating new length. */
646 *new_len = new_insn - first_insn;
651 if (new_flen != new_insn - first_insn) {
652 new_flen = new_insn - first_insn;
659 BUG_ON(*new_len != new_flen);
668 * As we dont want to clear mem[] array for each packet going through
669 * __bpf_prog_run(), we check that filter loaded by user never try to read
670 * a cell if not previously written, and we check all branches to be sure
671 * a malicious user doesn't try to abuse us.
673 static int check_load_and_stores(const struct sock_filter *filter, int flen)
675 u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */
678 BUILD_BUG_ON(BPF_MEMWORDS > 16);
680 masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL);
684 memset(masks, 0xff, flen * sizeof(*masks));
686 for (pc = 0; pc < flen; pc++) {
687 memvalid &= masks[pc];
689 switch (filter[pc].code) {
692 memvalid |= (1 << filter[pc].k);
694 case BPF_LD | BPF_MEM:
695 case BPF_LDX | BPF_MEM:
696 if (!(memvalid & (1 << filter[pc].k))) {
701 case BPF_JMP | BPF_JA:
702 /* A jump must set masks on target */
703 masks[pc + 1 + filter[pc].k] &= memvalid;
706 case BPF_JMP | BPF_JEQ | BPF_K:
707 case BPF_JMP | BPF_JEQ | BPF_X:
708 case BPF_JMP | BPF_JGE | BPF_K:
709 case BPF_JMP | BPF_JGE | BPF_X:
710 case BPF_JMP | BPF_JGT | BPF_K:
711 case BPF_JMP | BPF_JGT | BPF_X:
712 case BPF_JMP | BPF_JSET | BPF_K:
713 case BPF_JMP | BPF_JSET | BPF_X:
714 /* A jump must set masks on targets */
715 masks[pc + 1 + filter[pc].jt] &= memvalid;
716 masks[pc + 1 + filter[pc].jf] &= memvalid;
726 static bool chk_code_allowed(u16 code_to_probe)
728 static const bool codes[] = {
729 /* 32 bit ALU operations */
730 [BPF_ALU | BPF_ADD | BPF_K] = true,
731 [BPF_ALU | BPF_ADD | BPF_X] = true,
732 [BPF_ALU | BPF_SUB | BPF_K] = true,
733 [BPF_ALU | BPF_SUB | BPF_X] = true,
734 [BPF_ALU | BPF_MUL | BPF_K] = true,
735 [BPF_ALU | BPF_MUL | BPF_X] = true,
736 [BPF_ALU | BPF_DIV | BPF_K] = true,
737 [BPF_ALU | BPF_DIV | BPF_X] = true,
738 [BPF_ALU | BPF_MOD | BPF_K] = true,
739 [BPF_ALU | BPF_MOD | BPF_X] = true,
740 [BPF_ALU | BPF_AND | BPF_K] = true,
741 [BPF_ALU | BPF_AND | BPF_X] = true,
742 [BPF_ALU | BPF_OR | BPF_K] = true,
743 [BPF_ALU | BPF_OR | BPF_X] = true,
744 [BPF_ALU | BPF_XOR | BPF_K] = true,
745 [BPF_ALU | BPF_XOR | BPF_X] = true,
746 [BPF_ALU | BPF_LSH | BPF_K] = true,
747 [BPF_ALU | BPF_LSH | BPF_X] = true,
748 [BPF_ALU | BPF_RSH | BPF_K] = true,
749 [BPF_ALU | BPF_RSH | BPF_X] = true,
750 [BPF_ALU | BPF_NEG] = true,
751 /* Load instructions */
752 [BPF_LD | BPF_W | BPF_ABS] = true,
753 [BPF_LD | BPF_H | BPF_ABS] = true,
754 [BPF_LD | BPF_B | BPF_ABS] = true,
755 [BPF_LD | BPF_W | BPF_LEN] = true,
756 [BPF_LD | BPF_W | BPF_IND] = true,
757 [BPF_LD | BPF_H | BPF_IND] = true,
758 [BPF_LD | BPF_B | BPF_IND] = true,
759 [BPF_LD | BPF_IMM] = true,
760 [BPF_LD | BPF_MEM] = true,
761 [BPF_LDX | BPF_W | BPF_LEN] = true,
762 [BPF_LDX | BPF_B | BPF_MSH] = true,
763 [BPF_LDX | BPF_IMM] = true,
764 [BPF_LDX | BPF_MEM] = true,
765 /* Store instructions */
768 /* Misc instructions */
769 [BPF_MISC | BPF_TAX] = true,
770 [BPF_MISC | BPF_TXA] = true,
771 /* Return instructions */
772 [BPF_RET | BPF_K] = true,
773 [BPF_RET | BPF_A] = true,
774 /* Jump instructions */
775 [BPF_JMP | BPF_JA] = true,
776 [BPF_JMP | BPF_JEQ | BPF_K] = true,
777 [BPF_JMP | BPF_JEQ | BPF_X] = true,
778 [BPF_JMP | BPF_JGE | BPF_K] = true,
779 [BPF_JMP | BPF_JGE | BPF_X] = true,
780 [BPF_JMP | BPF_JGT | BPF_K] = true,
781 [BPF_JMP | BPF_JGT | BPF_X] = true,
782 [BPF_JMP | BPF_JSET | BPF_K] = true,
783 [BPF_JMP | BPF_JSET | BPF_X] = true,
786 if (code_to_probe >= ARRAY_SIZE(codes))
789 return codes[code_to_probe];
792 static bool bpf_check_basics_ok(const struct sock_filter *filter,
797 if (flen == 0 || flen > BPF_MAXINSNS)
804 * bpf_check_classic - verify socket filter code
805 * @filter: filter to verify
806 * @flen: length of filter
808 * Check the user's filter code. If we let some ugly
809 * filter code slip through kaboom! The filter must contain
810 * no references or jumps that are out of range, no illegal
811 * instructions, and must end with a RET instruction.
813 * All jumps are forward as they are not signed.
815 * Returns 0 if the rule set is legal or -EINVAL if not.
817 static int bpf_check_classic(const struct sock_filter *filter,
823 /* Check the filter code now */
824 for (pc = 0; pc < flen; pc++) {
825 const struct sock_filter *ftest = &filter[pc];
827 /* May we actually operate on this code? */
828 if (!chk_code_allowed(ftest->code))
831 /* Some instructions need special checks */
832 switch (ftest->code) {
833 case BPF_ALU | BPF_DIV | BPF_K:
834 case BPF_ALU | BPF_MOD | BPF_K:
835 /* Check for division by zero */
839 case BPF_ALU | BPF_LSH | BPF_K:
840 case BPF_ALU | BPF_RSH | BPF_K:
844 case BPF_LD | BPF_MEM:
845 case BPF_LDX | BPF_MEM:
848 /* Check for invalid memory addresses */
849 if (ftest->k >= BPF_MEMWORDS)
852 case BPF_JMP | BPF_JA:
853 /* Note, the large ftest->k might cause loops.
854 * Compare this with conditional jumps below,
855 * where offsets are limited. --ANK (981016)
857 if (ftest->k >= (unsigned int)(flen - pc - 1))
860 case BPF_JMP | BPF_JEQ | BPF_K:
861 case BPF_JMP | BPF_JEQ | BPF_X:
862 case BPF_JMP | BPF_JGE | BPF_K:
863 case BPF_JMP | BPF_JGE | BPF_X:
864 case BPF_JMP | BPF_JGT | BPF_K:
865 case BPF_JMP | BPF_JGT | BPF_X:
866 case BPF_JMP | BPF_JSET | BPF_K:
867 case BPF_JMP | BPF_JSET | BPF_X:
868 /* Both conditionals must be safe */
869 if (pc + ftest->jt + 1 >= flen ||
870 pc + ftest->jf + 1 >= flen)
873 case BPF_LD | BPF_W | BPF_ABS:
874 case BPF_LD | BPF_H | BPF_ABS:
875 case BPF_LD | BPF_B | BPF_ABS:
877 if (bpf_anc_helper(ftest) & BPF_ANC)
879 /* Ancillary operation unknown or unsupported */
880 if (anc_found == false && ftest->k >= SKF_AD_OFF)
885 /* Last instruction must be a RET code */
886 switch (filter[flen - 1].code) {
887 case BPF_RET | BPF_K:
888 case BPF_RET | BPF_A:
889 return check_load_and_stores(filter, flen);
895 static int bpf_prog_store_orig_filter(struct bpf_prog *fp,
896 const struct sock_fprog *fprog)
898 unsigned int fsize = bpf_classic_proglen(fprog);
899 struct sock_fprog_kern *fkprog;
901 fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL);
905 fkprog = fp->orig_prog;
906 fkprog->len = fprog->len;
908 fkprog->filter = kmemdup(fp->insns, fsize,
909 GFP_KERNEL | __GFP_NOWARN);
910 if (!fkprog->filter) {
911 kfree(fp->orig_prog);
918 static void bpf_release_orig_filter(struct bpf_prog *fp)
920 struct sock_fprog_kern *fprog = fp->orig_prog;
923 kfree(fprog->filter);
928 static void __bpf_prog_release(struct bpf_prog *prog)
930 if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) {
933 bpf_release_orig_filter(prog);
938 static void __sk_filter_release(struct sk_filter *fp)
940 __bpf_prog_release(fp->prog);
945 * sk_filter_release_rcu - Release a socket filter by rcu_head
946 * @rcu: rcu_head that contains the sk_filter to free
948 static void sk_filter_release_rcu(struct rcu_head *rcu)
950 struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu);
952 __sk_filter_release(fp);
956 * sk_filter_release - release a socket filter
957 * @fp: filter to remove
959 * Remove a filter from a socket and release its resources.
961 static void sk_filter_release(struct sk_filter *fp)
963 if (refcount_dec_and_test(&fp->refcnt))
964 call_rcu(&fp->rcu, sk_filter_release_rcu);
967 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp)
969 u32 filter_size = bpf_prog_size(fp->prog->len);
971 atomic_sub(filter_size, &sk->sk_omem_alloc);
972 sk_filter_release(fp);
975 /* try to charge the socket memory if there is space available
976 * return true on success
978 static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp)
980 u32 filter_size = bpf_prog_size(fp->prog->len);
982 /* same check as in sock_kmalloc() */
983 if (filter_size <= sysctl_optmem_max &&
984 atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) {
985 atomic_add(filter_size, &sk->sk_omem_alloc);
991 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp)
993 if (!refcount_inc_not_zero(&fp->refcnt))
996 if (!__sk_filter_charge(sk, fp)) {
997 sk_filter_release(fp);
1003 static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp)
1005 struct sock_filter *old_prog;
1006 struct bpf_prog *old_fp;
1007 int err, new_len, old_len = fp->len;
1009 /* We are free to overwrite insns et al right here as it
1010 * won't be used at this point in time anymore internally
1011 * after the migration to the internal BPF instruction
1014 BUILD_BUG_ON(sizeof(struct sock_filter) !=
1015 sizeof(struct bpf_insn));
1017 /* Conversion cannot happen on overlapping memory areas,
1018 * so we need to keep the user BPF around until the 2nd
1019 * pass. At this time, the user BPF is stored in fp->insns.
1021 old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter),
1022 GFP_KERNEL | __GFP_NOWARN);
1028 /* 1st pass: calculate the new program length. */
1029 err = bpf_convert_filter(old_prog, old_len, NULL, &new_len);
1033 /* Expand fp for appending the new filter representation. */
1035 fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0);
1037 /* The old_fp is still around in case we couldn't
1038 * allocate new memory, so uncharge on that one.
1047 /* 2nd pass: remap sock_filter insns into bpf_insn insns. */
1048 err = bpf_convert_filter(old_prog, old_len, fp, &new_len);
1050 /* 2nd bpf_convert_filter() can fail only if it fails
1051 * to allocate memory, remapping must succeed. Note,
1052 * that at this time old_fp has already been released
1057 fp = bpf_prog_select_runtime(fp, &err);
1067 __bpf_prog_release(fp);
1068 return ERR_PTR(err);
1071 static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp,
1072 bpf_aux_classic_check_t trans)
1076 fp->bpf_func = NULL;
1079 err = bpf_check_classic(fp->insns, fp->len);
1081 __bpf_prog_release(fp);
1082 return ERR_PTR(err);
1085 /* There might be additional checks and transformations
1086 * needed on classic filters, f.e. in case of seccomp.
1089 err = trans(fp->insns, fp->len);
1091 __bpf_prog_release(fp);
1092 return ERR_PTR(err);
1096 /* Probe if we can JIT compile the filter and if so, do
1097 * the compilation of the filter.
1099 bpf_jit_compile(fp);
1101 /* JIT compiler couldn't process this filter, so do the
1102 * internal BPF translation for the optimized interpreter.
1105 fp = bpf_migrate_filter(fp);
1111 * bpf_prog_create - create an unattached filter
1112 * @pfp: the unattached filter that is created
1113 * @fprog: the filter program
1115 * Create a filter independent of any socket. We first run some
1116 * sanity checks on it to make sure it does not explode on us later.
1117 * If an error occurs or there is insufficient memory for the filter
1118 * a negative errno code is returned. On success the return is zero.
1120 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog)
1122 unsigned int fsize = bpf_classic_proglen(fprog);
1123 struct bpf_prog *fp;
1125 /* Make sure new filter is there and in the right amounts. */
1126 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1129 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1133 memcpy(fp->insns, fprog->filter, fsize);
1135 fp->len = fprog->len;
1136 /* Since unattached filters are not copied back to user
1137 * space through sk_get_filter(), we do not need to hold
1138 * a copy here, and can spare us the work.
1140 fp->orig_prog = NULL;
1142 /* bpf_prepare_filter() already takes care of freeing
1143 * memory in case something goes wrong.
1145 fp = bpf_prepare_filter(fp, NULL);
1152 EXPORT_SYMBOL_GPL(bpf_prog_create);
1155 * bpf_prog_create_from_user - create an unattached filter from user buffer
1156 * @pfp: the unattached filter that is created
1157 * @fprog: the filter program
1158 * @trans: post-classic verifier transformation handler
1159 * @save_orig: save classic BPF program
1161 * This function effectively does the same as bpf_prog_create(), only
1162 * that it builds up its insns buffer from user space provided buffer.
1163 * It also allows for passing a bpf_aux_classic_check_t handler.
1165 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
1166 bpf_aux_classic_check_t trans, bool save_orig)
1168 unsigned int fsize = bpf_classic_proglen(fprog);
1169 struct bpf_prog *fp;
1172 /* Make sure new filter is there and in the right amounts. */
1173 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1176 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1180 if (copy_from_user(fp->insns, fprog->filter, fsize)) {
1181 __bpf_prog_free(fp);
1185 fp->len = fprog->len;
1186 fp->orig_prog = NULL;
1189 err = bpf_prog_store_orig_filter(fp, fprog);
1191 __bpf_prog_free(fp);
1196 /* bpf_prepare_filter() already takes care of freeing
1197 * memory in case something goes wrong.
1199 fp = bpf_prepare_filter(fp, trans);
1206 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user);
1208 void bpf_prog_destroy(struct bpf_prog *fp)
1210 __bpf_prog_release(fp);
1212 EXPORT_SYMBOL_GPL(bpf_prog_destroy);
1214 static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk)
1216 struct sk_filter *fp, *old_fp;
1218 fp = kmalloc(sizeof(*fp), GFP_KERNEL);
1224 if (!__sk_filter_charge(sk, fp)) {
1228 refcount_set(&fp->refcnt, 1);
1230 old_fp = rcu_dereference_protected(sk->sk_filter,
1231 lockdep_sock_is_held(sk));
1232 rcu_assign_pointer(sk->sk_filter, fp);
1235 sk_filter_uncharge(sk, old_fp);
1240 static int __reuseport_attach_prog(struct bpf_prog *prog, struct sock *sk)
1242 struct bpf_prog *old_prog;
1245 if (bpf_prog_size(prog->len) > sysctl_optmem_max)
1248 if (sk_unhashed(sk) && sk->sk_reuseport) {
1249 err = reuseport_alloc(sk);
1252 } else if (!rcu_access_pointer(sk->sk_reuseport_cb)) {
1253 /* The socket wasn't bound with SO_REUSEPORT */
1257 old_prog = reuseport_attach_prog(sk, prog);
1259 bpf_prog_destroy(old_prog);
1265 struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk)
1267 unsigned int fsize = bpf_classic_proglen(fprog);
1268 struct bpf_prog *prog;
1271 if (sock_flag(sk, SOCK_FILTER_LOCKED))
1272 return ERR_PTR(-EPERM);
1274 /* Make sure new filter is there and in the right amounts. */
1275 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1276 return ERR_PTR(-EINVAL);
1278 prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1280 return ERR_PTR(-ENOMEM);
1282 if (copy_from_user(prog->insns, fprog->filter, fsize)) {
1283 __bpf_prog_free(prog);
1284 return ERR_PTR(-EFAULT);
1287 prog->len = fprog->len;
1289 err = bpf_prog_store_orig_filter(prog, fprog);
1291 __bpf_prog_free(prog);
1292 return ERR_PTR(-ENOMEM);
1295 /* bpf_prepare_filter() already takes care of freeing
1296 * memory in case something goes wrong.
1298 return bpf_prepare_filter(prog, NULL);
1302 * sk_attach_filter - attach a socket filter
1303 * @fprog: the filter program
1304 * @sk: the socket to use
1306 * Attach the user's filter code. We first run some sanity checks on
1307 * it to make sure it does not explode on us later. If an error
1308 * occurs or there is insufficient memory for the filter a negative
1309 * errno code is returned. On success the return is zero.
1311 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
1313 struct bpf_prog *prog = __get_filter(fprog, sk);
1317 return PTR_ERR(prog);
1319 err = __sk_attach_prog(prog, sk);
1321 __bpf_prog_release(prog);
1327 EXPORT_SYMBOL_GPL(sk_attach_filter);
1329 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk)
1331 struct bpf_prog *prog = __get_filter(fprog, sk);
1335 return PTR_ERR(prog);
1337 err = __reuseport_attach_prog(prog, sk);
1339 __bpf_prog_release(prog);
1346 static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk)
1348 if (sock_flag(sk, SOCK_FILTER_LOCKED))
1349 return ERR_PTR(-EPERM);
1351 return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
1354 int sk_attach_bpf(u32 ufd, struct sock *sk)
1356 struct bpf_prog *prog = __get_bpf(ufd, sk);
1360 return PTR_ERR(prog);
1362 err = __sk_attach_prog(prog, sk);
1371 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk)
1373 struct bpf_prog *prog = __get_bpf(ufd, sk);
1377 return PTR_ERR(prog);
1379 err = __reuseport_attach_prog(prog, sk);
1388 struct bpf_scratchpad {
1390 __be32 diff[MAX_BPF_STACK / sizeof(__be32)];
1391 u8 buff[MAX_BPF_STACK];
1395 static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp);
1397 static inline int __bpf_try_make_writable(struct sk_buff *skb,
1398 unsigned int write_len)
1400 return skb_ensure_writable(skb, write_len);
1403 static inline int bpf_try_make_writable(struct sk_buff *skb,
1404 unsigned int write_len)
1406 int err = __bpf_try_make_writable(skb, write_len);
1408 bpf_compute_data_pointers(skb);
1412 static int bpf_try_make_head_writable(struct sk_buff *skb)
1414 return bpf_try_make_writable(skb, skb_headlen(skb));
1417 static inline void bpf_push_mac_rcsum(struct sk_buff *skb)
1419 if (skb_at_tc_ingress(skb))
1420 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1423 static inline void bpf_pull_mac_rcsum(struct sk_buff *skb)
1425 if (skb_at_tc_ingress(skb))
1426 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1429 BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset,
1430 const void *, from, u32, len, u64, flags)
1434 if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH)))
1436 if (unlikely(offset > 0xffff))
1438 if (unlikely(bpf_try_make_writable(skb, offset + len)))
1441 ptr = skb->data + offset;
1442 if (flags & BPF_F_RECOMPUTE_CSUM)
1443 __skb_postpull_rcsum(skb, ptr, len, offset);
1445 memcpy(ptr, from, len);
1447 if (flags & BPF_F_RECOMPUTE_CSUM)
1448 __skb_postpush_rcsum(skb, ptr, len, offset);
1449 if (flags & BPF_F_INVALIDATE_HASH)
1450 skb_clear_hash(skb);
1455 static const struct bpf_func_proto bpf_skb_store_bytes_proto = {
1456 .func = bpf_skb_store_bytes,
1458 .ret_type = RET_INTEGER,
1459 .arg1_type = ARG_PTR_TO_CTX,
1460 .arg2_type = ARG_ANYTHING,
1461 .arg3_type = ARG_PTR_TO_MEM,
1462 .arg4_type = ARG_CONST_SIZE,
1463 .arg5_type = ARG_ANYTHING,
1466 BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset,
1467 void *, to, u32, len)
1471 if (unlikely(offset > 0xffff))
1474 ptr = skb_header_pointer(skb, offset, len, to);
1478 memcpy(to, ptr, len);
1486 static const struct bpf_func_proto bpf_skb_load_bytes_proto = {
1487 .func = bpf_skb_load_bytes,
1489 .ret_type = RET_INTEGER,
1490 .arg1_type = ARG_PTR_TO_CTX,
1491 .arg2_type = ARG_ANYTHING,
1492 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
1493 .arg4_type = ARG_CONST_SIZE,
1496 BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len)
1498 /* Idea is the following: should the needed direct read/write
1499 * test fail during runtime, we can pull in more data and redo
1500 * again, since implicitly, we invalidate previous checks here.
1502 * Or, since we know how much we need to make read/writeable,
1503 * this can be done once at the program beginning for direct
1504 * access case. By this we overcome limitations of only current
1505 * headroom being accessible.
1507 return bpf_try_make_writable(skb, len ? : skb_headlen(skb));
1510 static const struct bpf_func_proto bpf_skb_pull_data_proto = {
1511 .func = bpf_skb_pull_data,
1513 .ret_type = RET_INTEGER,
1514 .arg1_type = ARG_PTR_TO_CTX,
1515 .arg2_type = ARG_ANYTHING,
1518 BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset,
1519 u64, from, u64, to, u64, flags)
1523 if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK)))
1525 if (unlikely(offset > 0xffff || offset & 1))
1527 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
1530 ptr = (__sum16 *)(skb->data + offset);
1531 switch (flags & BPF_F_HDR_FIELD_MASK) {
1533 if (unlikely(from != 0))
1536 csum_replace_by_diff(ptr, to);
1539 csum_replace2(ptr, from, to);
1542 csum_replace4(ptr, from, to);
1551 static const struct bpf_func_proto bpf_l3_csum_replace_proto = {
1552 .func = bpf_l3_csum_replace,
1554 .ret_type = RET_INTEGER,
1555 .arg1_type = ARG_PTR_TO_CTX,
1556 .arg2_type = ARG_ANYTHING,
1557 .arg3_type = ARG_ANYTHING,
1558 .arg4_type = ARG_ANYTHING,
1559 .arg5_type = ARG_ANYTHING,
1562 BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset,
1563 u64, from, u64, to, u64, flags)
1565 bool is_pseudo = flags & BPF_F_PSEUDO_HDR;
1566 bool is_mmzero = flags & BPF_F_MARK_MANGLED_0;
1567 bool do_mforce = flags & BPF_F_MARK_ENFORCE;
1570 if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE |
1571 BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK)))
1573 if (unlikely(offset > 0xffff || offset & 1))
1575 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
1578 ptr = (__sum16 *)(skb->data + offset);
1579 if (is_mmzero && !do_mforce && !*ptr)
1582 switch (flags & BPF_F_HDR_FIELD_MASK) {
1584 if (unlikely(from != 0))
1587 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo);
1590 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo);
1593 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo);
1599 if (is_mmzero && !*ptr)
1600 *ptr = CSUM_MANGLED_0;
1604 static const struct bpf_func_proto bpf_l4_csum_replace_proto = {
1605 .func = bpf_l4_csum_replace,
1607 .ret_type = RET_INTEGER,
1608 .arg1_type = ARG_PTR_TO_CTX,
1609 .arg2_type = ARG_ANYTHING,
1610 .arg3_type = ARG_ANYTHING,
1611 .arg4_type = ARG_ANYTHING,
1612 .arg5_type = ARG_ANYTHING,
1615 BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size,
1616 __be32 *, to, u32, to_size, __wsum, seed)
1618 struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp);
1619 u32 diff_size = from_size + to_size;
1622 /* This is quite flexible, some examples:
1624 * from_size == 0, to_size > 0, seed := csum --> pushing data
1625 * from_size > 0, to_size == 0, seed := csum --> pulling data
1626 * from_size > 0, to_size > 0, seed := 0 --> diffing data
1628 * Even for diffing, from_size and to_size don't need to be equal.
1630 if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) ||
1631 diff_size > sizeof(sp->diff)))
1634 for (i = 0; i < from_size / sizeof(__be32); i++, j++)
1635 sp->diff[j] = ~from[i];
1636 for (i = 0; i < to_size / sizeof(__be32); i++, j++)
1637 sp->diff[j] = to[i];
1639 return csum_partial(sp->diff, diff_size, seed);
1642 static const struct bpf_func_proto bpf_csum_diff_proto = {
1643 .func = bpf_csum_diff,
1646 .ret_type = RET_INTEGER,
1647 .arg1_type = ARG_PTR_TO_MEM_OR_NULL,
1648 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
1649 .arg3_type = ARG_PTR_TO_MEM_OR_NULL,
1650 .arg4_type = ARG_CONST_SIZE_OR_ZERO,
1651 .arg5_type = ARG_ANYTHING,
1654 BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum)
1656 /* The interface is to be used in combination with bpf_csum_diff()
1657 * for direct packet writes. csum rotation for alignment as well
1658 * as emulating csum_sub() can be done from the eBPF program.
1660 if (skb->ip_summed == CHECKSUM_COMPLETE)
1661 return (skb->csum = csum_add(skb->csum, csum));
1666 static const struct bpf_func_proto bpf_csum_update_proto = {
1667 .func = bpf_csum_update,
1669 .ret_type = RET_INTEGER,
1670 .arg1_type = ARG_PTR_TO_CTX,
1671 .arg2_type = ARG_ANYTHING,
1674 static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb)
1676 return dev_forward_skb(dev, skb);
1679 static inline int __bpf_rx_skb_no_mac(struct net_device *dev,
1680 struct sk_buff *skb)
1682 int ret = ____dev_forward_skb(dev, skb);
1686 ret = netif_rx(skb);
1692 static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb)
1696 if (unlikely(__this_cpu_read(xmit_recursion) > XMIT_RECURSION_LIMIT)) {
1697 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
1704 __this_cpu_inc(xmit_recursion);
1705 ret = dev_queue_xmit(skb);
1706 __this_cpu_dec(xmit_recursion);
1711 static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev,
1714 /* skb->mac_len is not set on normal egress */
1715 unsigned int mlen = skb->network_header - skb->mac_header;
1717 __skb_pull(skb, mlen);
1719 /* At ingress, the mac header has already been pulled once.
1720 * At egress, skb_pospull_rcsum has to be done in case that
1721 * the skb is originated from ingress (i.e. a forwarded skb)
1722 * to ensure that rcsum starts at net header.
1724 if (!skb_at_tc_ingress(skb))
1725 skb_postpull_rcsum(skb, skb_mac_header(skb), mlen);
1726 skb_pop_mac_header(skb);
1727 skb_reset_mac_len(skb);
1728 return flags & BPF_F_INGRESS ?
1729 __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb);
1732 static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev,
1735 /* Verify that a link layer header is carried */
1736 if (unlikely(skb->mac_header >= skb->network_header)) {
1741 bpf_push_mac_rcsum(skb);
1742 return flags & BPF_F_INGRESS ?
1743 __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb);
1746 static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev,
1749 if (dev_is_mac_header_xmit(dev))
1750 return __bpf_redirect_common(skb, dev, flags);
1752 return __bpf_redirect_no_mac(skb, dev, flags);
1755 BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags)
1757 struct net_device *dev;
1758 struct sk_buff *clone;
1761 if (unlikely(flags & ~(BPF_F_INGRESS)))
1764 dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex);
1768 clone = skb_clone(skb, GFP_ATOMIC);
1769 if (unlikely(!clone))
1772 /* For direct write, we need to keep the invariant that the skbs
1773 * we're dealing with need to be uncloned. Should uncloning fail
1774 * here, we need to free the just generated clone to unclone once
1777 ret = bpf_try_make_head_writable(skb);
1778 if (unlikely(ret)) {
1783 return __bpf_redirect(clone, dev, flags);
1786 static const struct bpf_func_proto bpf_clone_redirect_proto = {
1787 .func = bpf_clone_redirect,
1789 .ret_type = RET_INTEGER,
1790 .arg1_type = ARG_PTR_TO_CTX,
1791 .arg2_type = ARG_ANYTHING,
1792 .arg3_type = ARG_ANYTHING,
1795 struct redirect_info {
1798 struct bpf_map *map;
1799 struct bpf_map *map_to_flush;
1800 unsigned long map_owner;
1803 static DEFINE_PER_CPU(struct redirect_info, redirect_info);
1805 BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags)
1807 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
1809 if (unlikely(flags & ~(BPF_F_INGRESS)))
1812 ri->ifindex = ifindex;
1815 return TC_ACT_REDIRECT;
1818 int skb_do_redirect(struct sk_buff *skb)
1820 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
1821 struct net_device *dev;
1823 dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->ifindex);
1825 if (unlikely(!dev)) {
1830 return __bpf_redirect(skb, dev, ri->flags);
1833 static const struct bpf_func_proto bpf_redirect_proto = {
1834 .func = bpf_redirect,
1836 .ret_type = RET_INTEGER,
1837 .arg1_type = ARG_ANYTHING,
1838 .arg2_type = ARG_ANYTHING,
1841 BPF_CALL_4(bpf_sk_redirect_map, struct sk_buff *, skb,
1842 struct bpf_map *, map, u32, key, u64, flags)
1844 struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
1846 /* If user passes invalid input drop the packet. */
1847 if (unlikely(flags))
1851 tcb->bpf.flags = flags;
1857 struct sock *do_sk_redirect_map(struct sk_buff *skb)
1859 struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
1860 struct sock *sk = NULL;
1863 sk = __sock_map_lookup_elem(tcb->bpf.map, tcb->bpf.key);
1866 tcb->bpf.map = NULL;
1872 static const struct bpf_func_proto bpf_sk_redirect_map_proto = {
1873 .func = bpf_sk_redirect_map,
1875 .ret_type = RET_INTEGER,
1876 .arg1_type = ARG_PTR_TO_CTX,
1877 .arg2_type = ARG_CONST_MAP_PTR,
1878 .arg3_type = ARG_ANYTHING,
1879 .arg4_type = ARG_ANYTHING,
1882 BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb)
1884 return task_get_classid(skb);
1887 static const struct bpf_func_proto bpf_get_cgroup_classid_proto = {
1888 .func = bpf_get_cgroup_classid,
1890 .ret_type = RET_INTEGER,
1891 .arg1_type = ARG_PTR_TO_CTX,
1894 BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb)
1896 return dst_tclassid(skb);
1899 static const struct bpf_func_proto bpf_get_route_realm_proto = {
1900 .func = bpf_get_route_realm,
1902 .ret_type = RET_INTEGER,
1903 .arg1_type = ARG_PTR_TO_CTX,
1906 BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb)
1908 /* If skb_clear_hash() was called due to mangling, we can
1909 * trigger SW recalculation here. Later access to hash
1910 * can then use the inline skb->hash via context directly
1911 * instead of calling this helper again.
1913 return skb_get_hash(skb);
1916 static const struct bpf_func_proto bpf_get_hash_recalc_proto = {
1917 .func = bpf_get_hash_recalc,
1919 .ret_type = RET_INTEGER,
1920 .arg1_type = ARG_PTR_TO_CTX,
1923 BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb)
1925 /* After all direct packet write, this can be used once for
1926 * triggering a lazy recalc on next skb_get_hash() invocation.
1928 skb_clear_hash(skb);
1932 static const struct bpf_func_proto bpf_set_hash_invalid_proto = {
1933 .func = bpf_set_hash_invalid,
1935 .ret_type = RET_INTEGER,
1936 .arg1_type = ARG_PTR_TO_CTX,
1939 BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash)
1941 /* Set user specified hash as L4(+), so that it gets returned
1942 * on skb_get_hash() call unless BPF prog later on triggers a
1945 __skb_set_sw_hash(skb, hash, true);
1949 static const struct bpf_func_proto bpf_set_hash_proto = {
1950 .func = bpf_set_hash,
1952 .ret_type = RET_INTEGER,
1953 .arg1_type = ARG_PTR_TO_CTX,
1954 .arg2_type = ARG_ANYTHING,
1957 BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto,
1962 if (unlikely(vlan_proto != htons(ETH_P_8021Q) &&
1963 vlan_proto != htons(ETH_P_8021AD)))
1964 vlan_proto = htons(ETH_P_8021Q);
1966 bpf_push_mac_rcsum(skb);
1967 ret = skb_vlan_push(skb, vlan_proto, vlan_tci);
1968 bpf_pull_mac_rcsum(skb);
1970 bpf_compute_data_pointers(skb);
1974 const struct bpf_func_proto bpf_skb_vlan_push_proto = {
1975 .func = bpf_skb_vlan_push,
1977 .ret_type = RET_INTEGER,
1978 .arg1_type = ARG_PTR_TO_CTX,
1979 .arg2_type = ARG_ANYTHING,
1980 .arg3_type = ARG_ANYTHING,
1982 EXPORT_SYMBOL_GPL(bpf_skb_vlan_push_proto);
1984 BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb)
1988 bpf_push_mac_rcsum(skb);
1989 ret = skb_vlan_pop(skb);
1990 bpf_pull_mac_rcsum(skb);
1992 bpf_compute_data_pointers(skb);
1996 const struct bpf_func_proto bpf_skb_vlan_pop_proto = {
1997 .func = bpf_skb_vlan_pop,
1999 .ret_type = RET_INTEGER,
2000 .arg1_type = ARG_PTR_TO_CTX,
2002 EXPORT_SYMBOL_GPL(bpf_skb_vlan_pop_proto);
2004 static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len)
2006 /* Caller already did skb_cow() with len as headroom,
2007 * so no need to do it here.
2010 memmove(skb->data, skb->data + len, off);
2011 memset(skb->data + off, 0, len);
2013 /* No skb_postpush_rcsum(skb, skb->data + off, len)
2014 * needed here as it does not change the skb->csum
2015 * result for checksum complete when summing over
2021 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len)
2023 /* skb_ensure_writable() is not needed here, as we're
2024 * already working on an uncloned skb.
2026 if (unlikely(!pskb_may_pull(skb, off + len)))
2029 skb_postpull_rcsum(skb, skb->data + off, len);
2030 memmove(skb->data + len, skb->data, off);
2031 __skb_pull(skb, len);
2036 static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len)
2038 bool trans_same = skb->transport_header == skb->network_header;
2041 /* There's no need for __skb_push()/__skb_pull() pair to
2042 * get to the start of the mac header as we're guaranteed
2043 * to always start from here under eBPF.
2045 ret = bpf_skb_generic_push(skb, off, len);
2047 skb->mac_header -= len;
2048 skb->network_header -= len;
2050 skb->transport_header = skb->network_header;
2056 static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len)
2058 bool trans_same = skb->transport_header == skb->network_header;
2061 /* Same here, __skb_push()/__skb_pull() pair not needed. */
2062 ret = bpf_skb_generic_pop(skb, off, len);
2064 skb->mac_header += len;
2065 skb->network_header += len;
2067 skb->transport_header = skb->network_header;
2073 static int bpf_skb_proto_4_to_6(struct sk_buff *skb)
2075 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
2076 u32 off = skb_mac_header_len(skb);
2079 ret = skb_cow(skb, len_diff);
2080 if (unlikely(ret < 0))
2083 ret = bpf_skb_net_hdr_push(skb, off, len_diff);
2084 if (unlikely(ret < 0))
2087 if (skb_is_gso(skb)) {
2088 /* SKB_GSO_TCPV4 needs to be changed into
2091 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
2092 skb_shinfo(skb)->gso_type &= ~SKB_GSO_TCPV4;
2093 skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6;
2096 /* Due to IPv6 header, MSS needs to be downgraded. */
2097 skb_shinfo(skb)->gso_size -= len_diff;
2098 /* Header must be checked, and gso_segs recomputed. */
2099 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2100 skb_shinfo(skb)->gso_segs = 0;
2103 skb->protocol = htons(ETH_P_IPV6);
2104 skb_clear_hash(skb);
2109 static int bpf_skb_proto_6_to_4(struct sk_buff *skb)
2111 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
2112 u32 off = skb_mac_header_len(skb);
2115 ret = skb_unclone(skb, GFP_ATOMIC);
2116 if (unlikely(ret < 0))
2119 ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
2120 if (unlikely(ret < 0))
2123 if (skb_is_gso(skb)) {
2124 /* SKB_GSO_TCPV6 needs to be changed into
2127 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) {
2128 skb_shinfo(skb)->gso_type &= ~SKB_GSO_TCPV6;
2129 skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4;
2132 /* Due to IPv4 header, MSS can be upgraded. */
2133 skb_shinfo(skb)->gso_size += len_diff;
2134 /* Header must be checked, and gso_segs recomputed. */
2135 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2136 skb_shinfo(skb)->gso_segs = 0;
2139 skb->protocol = htons(ETH_P_IP);
2140 skb_clear_hash(skb);
2145 static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto)
2147 __be16 from_proto = skb->protocol;
2149 if (from_proto == htons(ETH_P_IP) &&
2150 to_proto == htons(ETH_P_IPV6))
2151 return bpf_skb_proto_4_to_6(skb);
2153 if (from_proto == htons(ETH_P_IPV6) &&
2154 to_proto == htons(ETH_P_IP))
2155 return bpf_skb_proto_6_to_4(skb);
2160 BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto,
2165 if (unlikely(flags))
2168 /* General idea is that this helper does the basic groundwork
2169 * needed for changing the protocol, and eBPF program fills the
2170 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace()
2171 * and other helpers, rather than passing a raw buffer here.
2173 * The rationale is to keep this minimal and without a need to
2174 * deal with raw packet data. F.e. even if we would pass buffers
2175 * here, the program still needs to call the bpf_lX_csum_replace()
2176 * helpers anyway. Plus, this way we keep also separation of
2177 * concerns, since f.e. bpf_skb_store_bytes() should only take
2180 * Currently, additional options and extension header space are
2181 * not supported, but flags register is reserved so we can adapt
2182 * that. For offloads, we mark packet as dodgy, so that headers
2183 * need to be verified first.
2185 ret = bpf_skb_proto_xlat(skb, proto);
2186 bpf_compute_data_pointers(skb);
2190 static const struct bpf_func_proto bpf_skb_change_proto_proto = {
2191 .func = bpf_skb_change_proto,
2193 .ret_type = RET_INTEGER,
2194 .arg1_type = ARG_PTR_TO_CTX,
2195 .arg2_type = ARG_ANYTHING,
2196 .arg3_type = ARG_ANYTHING,
2199 BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type)
2201 /* We only allow a restricted subset to be changed for now. */
2202 if (unlikely(!skb_pkt_type_ok(skb->pkt_type) ||
2203 !skb_pkt_type_ok(pkt_type)))
2206 skb->pkt_type = pkt_type;
2210 static const struct bpf_func_proto bpf_skb_change_type_proto = {
2211 .func = bpf_skb_change_type,
2213 .ret_type = RET_INTEGER,
2214 .arg1_type = ARG_PTR_TO_CTX,
2215 .arg2_type = ARG_ANYTHING,
2218 static u32 bpf_skb_net_base_len(const struct sk_buff *skb)
2220 switch (skb->protocol) {
2221 case htons(ETH_P_IP):
2222 return sizeof(struct iphdr);
2223 case htons(ETH_P_IPV6):
2224 return sizeof(struct ipv6hdr);
2230 static int bpf_skb_net_grow(struct sk_buff *skb, u32 len_diff)
2232 u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb);
2235 ret = skb_cow(skb, len_diff);
2236 if (unlikely(ret < 0))
2239 ret = bpf_skb_net_hdr_push(skb, off, len_diff);
2240 if (unlikely(ret < 0))
2243 if (skb_is_gso(skb)) {
2244 /* Due to header grow, MSS needs to be downgraded. */
2245 skb_shinfo(skb)->gso_size -= len_diff;
2246 /* Header must be checked, and gso_segs recomputed. */
2247 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2248 skb_shinfo(skb)->gso_segs = 0;
2254 static int bpf_skb_net_shrink(struct sk_buff *skb, u32 len_diff)
2256 u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb);
2259 ret = skb_unclone(skb, GFP_ATOMIC);
2260 if (unlikely(ret < 0))
2263 ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
2264 if (unlikely(ret < 0))
2267 if (skb_is_gso(skb)) {
2268 /* Due to header shrink, MSS can be upgraded. */
2269 skb_shinfo(skb)->gso_size += len_diff;
2270 /* Header must be checked, and gso_segs recomputed. */
2271 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2272 skb_shinfo(skb)->gso_segs = 0;
2278 static u32 __bpf_skb_max_len(const struct sk_buff *skb)
2280 return skb->dev->mtu + skb->dev->hard_header_len;
2283 static int bpf_skb_adjust_net(struct sk_buff *skb, s32 len_diff)
2285 bool trans_same = skb->transport_header == skb->network_header;
2286 u32 len_cur, len_diff_abs = abs(len_diff);
2287 u32 len_min = bpf_skb_net_base_len(skb);
2288 u32 len_max = __bpf_skb_max_len(skb);
2289 __be16 proto = skb->protocol;
2290 bool shrink = len_diff < 0;
2293 if (unlikely(len_diff_abs > 0xfffU))
2295 if (unlikely(proto != htons(ETH_P_IP) &&
2296 proto != htons(ETH_P_IPV6)))
2299 len_cur = skb->len - skb_network_offset(skb);
2300 if (skb_transport_header_was_set(skb) && !trans_same)
2301 len_cur = skb_network_header_len(skb);
2302 if ((shrink && (len_diff_abs >= len_cur ||
2303 len_cur - len_diff_abs < len_min)) ||
2304 (!shrink && (skb->len + len_diff_abs > len_max &&
2308 ret = shrink ? bpf_skb_net_shrink(skb, len_diff_abs) :
2309 bpf_skb_net_grow(skb, len_diff_abs);
2311 bpf_compute_data_pointers(skb);
2315 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff,
2316 u32, mode, u64, flags)
2318 if (unlikely(flags))
2320 if (likely(mode == BPF_ADJ_ROOM_NET))
2321 return bpf_skb_adjust_net(skb, len_diff);
2326 static const struct bpf_func_proto bpf_skb_adjust_room_proto = {
2327 .func = bpf_skb_adjust_room,
2329 .ret_type = RET_INTEGER,
2330 .arg1_type = ARG_PTR_TO_CTX,
2331 .arg2_type = ARG_ANYTHING,
2332 .arg3_type = ARG_ANYTHING,
2333 .arg4_type = ARG_ANYTHING,
2336 static u32 __bpf_skb_min_len(const struct sk_buff *skb)
2338 u32 min_len = skb_network_offset(skb);
2340 if (skb_transport_header_was_set(skb))
2341 min_len = skb_transport_offset(skb);
2342 if (skb->ip_summed == CHECKSUM_PARTIAL)
2343 min_len = skb_checksum_start_offset(skb) +
2344 skb->csum_offset + sizeof(__sum16);
2348 static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len)
2350 unsigned int old_len = skb->len;
2353 ret = __skb_grow_rcsum(skb, new_len);
2355 memset(skb->data + old_len, 0, new_len - old_len);
2359 static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len)
2361 return __skb_trim_rcsum(skb, new_len);
2364 BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len,
2367 u32 max_len = __bpf_skb_max_len(skb);
2368 u32 min_len = __bpf_skb_min_len(skb);
2371 if (unlikely(flags || new_len > max_len || new_len < min_len))
2373 if (skb->encapsulation)
2376 /* The basic idea of this helper is that it's performing the
2377 * needed work to either grow or trim an skb, and eBPF program
2378 * rewrites the rest via helpers like bpf_skb_store_bytes(),
2379 * bpf_lX_csum_replace() and others rather than passing a raw
2380 * buffer here. This one is a slow path helper and intended
2381 * for replies with control messages.
2383 * Like in bpf_skb_change_proto(), we want to keep this rather
2384 * minimal and without protocol specifics so that we are able
2385 * to separate concerns as in bpf_skb_store_bytes() should only
2386 * be the one responsible for writing buffers.
2388 * It's really expected to be a slow path operation here for
2389 * control message replies, so we're implicitly linearizing,
2390 * uncloning and drop offloads from the skb by this.
2392 ret = __bpf_try_make_writable(skb, skb->len);
2394 if (new_len > skb->len)
2395 ret = bpf_skb_grow_rcsum(skb, new_len);
2396 else if (new_len < skb->len)
2397 ret = bpf_skb_trim_rcsum(skb, new_len);
2398 if (!ret && skb_is_gso(skb))
2402 bpf_compute_data_pointers(skb);
2406 static const struct bpf_func_proto bpf_skb_change_tail_proto = {
2407 .func = bpf_skb_change_tail,
2409 .ret_type = RET_INTEGER,
2410 .arg1_type = ARG_PTR_TO_CTX,
2411 .arg2_type = ARG_ANYTHING,
2412 .arg3_type = ARG_ANYTHING,
2415 BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room,
2418 u32 max_len = __bpf_skb_max_len(skb);
2419 u32 new_len = skb->len + head_room;
2422 if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) ||
2423 new_len < skb->len))
2426 ret = skb_cow(skb, head_room);
2428 /* Idea for this helper is that we currently only
2429 * allow to expand on mac header. This means that
2430 * skb->protocol network header, etc, stay as is.
2431 * Compared to bpf_skb_change_tail(), we're more
2432 * flexible due to not needing to linearize or
2433 * reset GSO. Intention for this helper is to be
2434 * used by an L3 skb that needs to push mac header
2435 * for redirection into L2 device.
2437 __skb_push(skb, head_room);
2438 memset(skb->data, 0, head_room);
2439 skb_reset_mac_header(skb);
2442 bpf_compute_data_pointers(skb);
2446 static const struct bpf_func_proto bpf_skb_change_head_proto = {
2447 .func = bpf_skb_change_head,
2449 .ret_type = RET_INTEGER,
2450 .arg1_type = ARG_PTR_TO_CTX,
2451 .arg2_type = ARG_ANYTHING,
2452 .arg3_type = ARG_ANYTHING,
2455 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp)
2457 return xdp_data_meta_unsupported(xdp) ? 0 :
2458 xdp->data - xdp->data_meta;
2461 BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset)
2463 unsigned long metalen = xdp_get_metalen(xdp);
2464 void *data_start = xdp->data_hard_start + metalen;
2465 void *data = xdp->data + offset;
2467 if (unlikely(data < data_start ||
2468 data > xdp->data_end - ETH_HLEN))
2472 memmove(xdp->data_meta + offset,
2473 xdp->data_meta, metalen);
2474 xdp->data_meta += offset;
2480 static const struct bpf_func_proto bpf_xdp_adjust_head_proto = {
2481 .func = bpf_xdp_adjust_head,
2483 .ret_type = RET_INTEGER,
2484 .arg1_type = ARG_PTR_TO_CTX,
2485 .arg2_type = ARG_ANYTHING,
2488 BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset)
2490 void *meta = xdp->data_meta + offset;
2491 unsigned long metalen = xdp->data - meta;
2493 if (xdp_data_meta_unsupported(xdp))
2495 if (unlikely(meta < xdp->data_hard_start ||
2498 if (unlikely((metalen & (sizeof(__u32) - 1)) ||
2502 xdp->data_meta = meta;
2507 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = {
2508 .func = bpf_xdp_adjust_meta,
2510 .ret_type = RET_INTEGER,
2511 .arg1_type = ARG_PTR_TO_CTX,
2512 .arg2_type = ARG_ANYTHING,
2515 static int __bpf_tx_xdp(struct net_device *dev,
2516 struct bpf_map *map,
2517 struct xdp_buff *xdp,
2522 if (!dev->netdev_ops->ndo_xdp_xmit) {
2526 err = dev->netdev_ops->ndo_xdp_xmit(dev, xdp);
2529 dev->netdev_ops->ndo_xdp_flush(dev);
2533 static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd,
2534 struct bpf_map *map,
2535 struct xdp_buff *xdp,
2540 if (map->map_type == BPF_MAP_TYPE_DEVMAP) {
2541 struct net_device *dev = fwd;
2543 if (!dev->netdev_ops->ndo_xdp_xmit)
2546 err = dev->netdev_ops->ndo_xdp_xmit(dev, xdp);
2549 __dev_map_insert_ctx(map, index);
2551 } else if (map->map_type == BPF_MAP_TYPE_CPUMAP) {
2552 struct bpf_cpu_map_entry *rcpu = fwd;
2554 err = cpu_map_enqueue(rcpu, xdp, dev_rx);
2557 __cpu_map_insert_ctx(map, index);
2562 void xdp_do_flush_map(void)
2564 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2565 struct bpf_map *map = ri->map_to_flush;
2567 ri->map_to_flush = NULL;
2569 switch (map->map_type) {
2570 case BPF_MAP_TYPE_DEVMAP:
2571 __dev_map_flush(map);
2573 case BPF_MAP_TYPE_CPUMAP:
2574 __cpu_map_flush(map);
2581 EXPORT_SYMBOL_GPL(xdp_do_flush_map);
2583 static void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index)
2585 switch (map->map_type) {
2586 case BPF_MAP_TYPE_DEVMAP:
2587 return __dev_map_lookup_elem(map, index);
2588 case BPF_MAP_TYPE_CPUMAP:
2589 return __cpu_map_lookup_elem(map, index);
2595 static inline bool xdp_map_invalid(const struct bpf_prog *xdp_prog,
2598 return (unsigned long)xdp_prog->aux != aux;
2601 static int xdp_do_redirect_map(struct net_device *dev, struct xdp_buff *xdp,
2602 struct bpf_prog *xdp_prog)
2604 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2605 unsigned long map_owner = ri->map_owner;
2606 struct bpf_map *map = ri->map;
2607 u32 index = ri->ifindex;
2615 if (unlikely(xdp_map_invalid(xdp_prog, map_owner))) {
2621 fwd = __xdp_map_lookup_elem(map, index);
2626 if (ri->map_to_flush && ri->map_to_flush != map)
2629 err = __bpf_tx_xdp_map(dev, fwd, map, xdp, index);
2633 ri->map_to_flush = map;
2634 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
2637 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
2641 int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
2642 struct bpf_prog *xdp_prog)
2644 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2645 struct net_device *fwd;
2646 u32 index = ri->ifindex;
2650 return xdp_do_redirect_map(dev, xdp, xdp_prog);
2652 fwd = dev_get_by_index_rcu(dev_net(dev), index);
2654 if (unlikely(!fwd)) {
2659 err = __bpf_tx_xdp(fwd, NULL, xdp, 0);
2663 _trace_xdp_redirect(dev, xdp_prog, index);
2666 _trace_xdp_redirect_err(dev, xdp_prog, index, err);
2669 EXPORT_SYMBOL_GPL(xdp_do_redirect);
2671 static int __xdp_generic_ok_fwd_dev(struct sk_buff *skb, struct net_device *fwd)
2675 if (unlikely(!(fwd->flags & IFF_UP)))
2678 len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN;
2685 int xdp_do_generic_redirect_map(struct net_device *dev, struct sk_buff *skb,
2686 struct bpf_prog *xdp_prog)
2688 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2689 unsigned long map_owner = ri->map_owner;
2690 struct bpf_map *map = ri->map;
2691 struct net_device *fwd = NULL;
2692 u32 index = ri->ifindex;
2699 if (unlikely(xdp_map_invalid(xdp_prog, map_owner))) {
2704 fwd = __xdp_map_lookup_elem(map, index);
2705 if (unlikely(!fwd)) {
2710 if (map->map_type == BPF_MAP_TYPE_DEVMAP) {
2711 if (unlikely((err = __xdp_generic_ok_fwd_dev(skb, fwd))))
2715 /* TODO: Handle BPF_MAP_TYPE_CPUMAP */
2720 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
2723 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
2727 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
2728 struct bpf_prog *xdp_prog)
2730 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2731 u32 index = ri->ifindex;
2732 struct net_device *fwd;
2736 return xdp_do_generic_redirect_map(dev, skb, xdp_prog);
2739 fwd = dev_get_by_index_rcu(dev_net(dev), index);
2740 if (unlikely(!fwd)) {
2745 if (unlikely((err = __xdp_generic_ok_fwd_dev(skb, fwd))))
2749 _trace_xdp_redirect(dev, xdp_prog, index);
2752 _trace_xdp_redirect_err(dev, xdp_prog, index, err);
2755 EXPORT_SYMBOL_GPL(xdp_do_generic_redirect);
2757 BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags)
2759 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2761 if (unlikely(flags))
2764 ri->ifindex = ifindex;
2769 return XDP_REDIRECT;
2772 static const struct bpf_func_proto bpf_xdp_redirect_proto = {
2773 .func = bpf_xdp_redirect,
2775 .ret_type = RET_INTEGER,
2776 .arg1_type = ARG_ANYTHING,
2777 .arg2_type = ARG_ANYTHING,
2780 BPF_CALL_4(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex, u64, flags,
2781 unsigned long, map_owner)
2783 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2785 if (unlikely(flags))
2788 ri->ifindex = ifindex;
2791 ri->map_owner = map_owner;
2793 return XDP_REDIRECT;
2796 /* Note, arg4 is hidden from users and populated by the verifier
2797 * with the right pointer.
2799 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = {
2800 .func = bpf_xdp_redirect_map,
2802 .ret_type = RET_INTEGER,
2803 .arg1_type = ARG_CONST_MAP_PTR,
2804 .arg2_type = ARG_ANYTHING,
2805 .arg3_type = ARG_ANYTHING,
2808 bool bpf_helper_changes_pkt_data(void *func)
2810 if (func == bpf_skb_vlan_push ||
2811 func == bpf_skb_vlan_pop ||
2812 func == bpf_skb_store_bytes ||
2813 func == bpf_skb_change_proto ||
2814 func == bpf_skb_change_head ||
2815 func == bpf_skb_change_tail ||
2816 func == bpf_skb_adjust_room ||
2817 func == bpf_skb_pull_data ||
2818 func == bpf_clone_redirect ||
2819 func == bpf_l3_csum_replace ||
2820 func == bpf_l4_csum_replace ||
2821 func == bpf_xdp_adjust_head ||
2822 func == bpf_xdp_adjust_meta)
2828 static unsigned long bpf_skb_copy(void *dst_buff, const void *skb,
2829 unsigned long off, unsigned long len)
2831 void *ptr = skb_header_pointer(skb, off, len, dst_buff);
2835 if (ptr != dst_buff)
2836 memcpy(dst_buff, ptr, len);
2841 BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map,
2842 u64, flags, void *, meta, u64, meta_size)
2844 u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
2846 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
2848 if (unlikely(skb_size > skb->len))
2851 return bpf_event_output(map, flags, meta, meta_size, skb, skb_size,
2855 static const struct bpf_func_proto bpf_skb_event_output_proto = {
2856 .func = bpf_skb_event_output,
2858 .ret_type = RET_INTEGER,
2859 .arg1_type = ARG_PTR_TO_CTX,
2860 .arg2_type = ARG_CONST_MAP_PTR,
2861 .arg3_type = ARG_ANYTHING,
2862 .arg4_type = ARG_PTR_TO_MEM,
2863 .arg5_type = ARG_CONST_SIZE,
2866 static unsigned short bpf_tunnel_key_af(u64 flags)
2868 return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET;
2871 BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to,
2872 u32, size, u64, flags)
2874 const struct ip_tunnel_info *info = skb_tunnel_info(skb);
2875 u8 compat[sizeof(struct bpf_tunnel_key)];
2879 if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) {
2883 if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) {
2887 if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
2890 case offsetof(struct bpf_tunnel_key, tunnel_label):
2891 case offsetof(struct bpf_tunnel_key, tunnel_ext):
2893 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
2894 /* Fixup deprecated structure layouts here, so we have
2895 * a common path later on.
2897 if (ip_tunnel_info_af(info) != AF_INET)
2900 to = (struct bpf_tunnel_key *)compat;
2907 to->tunnel_id = be64_to_cpu(info->key.tun_id);
2908 to->tunnel_tos = info->key.tos;
2909 to->tunnel_ttl = info->key.ttl;
2911 if (flags & BPF_F_TUNINFO_IPV6) {
2912 memcpy(to->remote_ipv6, &info->key.u.ipv6.src,
2913 sizeof(to->remote_ipv6));
2914 to->tunnel_label = be32_to_cpu(info->key.label);
2916 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src);
2919 if (unlikely(size != sizeof(struct bpf_tunnel_key)))
2920 memcpy(to_orig, to, size);
2924 memset(to_orig, 0, size);
2928 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = {
2929 .func = bpf_skb_get_tunnel_key,
2931 .ret_type = RET_INTEGER,
2932 .arg1_type = ARG_PTR_TO_CTX,
2933 .arg2_type = ARG_PTR_TO_UNINIT_MEM,
2934 .arg3_type = ARG_CONST_SIZE,
2935 .arg4_type = ARG_ANYTHING,
2938 BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size)
2940 const struct ip_tunnel_info *info = skb_tunnel_info(skb);
2943 if (unlikely(!info ||
2944 !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) {
2948 if (unlikely(size < info->options_len)) {
2953 ip_tunnel_info_opts_get(to, info);
2954 if (size > info->options_len)
2955 memset(to + info->options_len, 0, size - info->options_len);
2957 return info->options_len;
2959 memset(to, 0, size);
2963 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = {
2964 .func = bpf_skb_get_tunnel_opt,
2966 .ret_type = RET_INTEGER,
2967 .arg1_type = ARG_PTR_TO_CTX,
2968 .arg2_type = ARG_PTR_TO_UNINIT_MEM,
2969 .arg3_type = ARG_CONST_SIZE,
2972 static struct metadata_dst __percpu *md_dst;
2974 BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb,
2975 const struct bpf_tunnel_key *, from, u32, size, u64, flags)
2977 struct metadata_dst *md = this_cpu_ptr(md_dst);
2978 u8 compat[sizeof(struct bpf_tunnel_key)];
2979 struct ip_tunnel_info *info;
2981 if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX |
2982 BPF_F_DONT_FRAGMENT)))
2984 if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
2986 case offsetof(struct bpf_tunnel_key, tunnel_label):
2987 case offsetof(struct bpf_tunnel_key, tunnel_ext):
2988 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
2989 /* Fixup deprecated structure layouts here, so we have
2990 * a common path later on.
2992 memcpy(compat, from, size);
2993 memset(compat + size, 0, sizeof(compat) - size);
2994 from = (const struct bpf_tunnel_key *) compat;
3000 if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) ||
3005 dst_hold((struct dst_entry *) md);
3006 skb_dst_set(skb, (struct dst_entry *) md);
3008 info = &md->u.tun_info;
3009 info->mode = IP_TUNNEL_INFO_TX;
3011 info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
3012 if (flags & BPF_F_DONT_FRAGMENT)
3013 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT;
3015 info->key.tun_id = cpu_to_be64(from->tunnel_id);
3016 info->key.tos = from->tunnel_tos;
3017 info->key.ttl = from->tunnel_ttl;
3019 if (flags & BPF_F_TUNINFO_IPV6) {
3020 info->mode |= IP_TUNNEL_INFO_IPV6;
3021 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6,
3022 sizeof(from->remote_ipv6));
3023 info->key.label = cpu_to_be32(from->tunnel_label) &
3024 IPV6_FLOWLABEL_MASK;
3026 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4);
3027 if (flags & BPF_F_ZERO_CSUM_TX)
3028 info->key.tun_flags &= ~TUNNEL_CSUM;
3034 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = {
3035 .func = bpf_skb_set_tunnel_key,
3037 .ret_type = RET_INTEGER,
3038 .arg1_type = ARG_PTR_TO_CTX,
3039 .arg2_type = ARG_PTR_TO_MEM,
3040 .arg3_type = ARG_CONST_SIZE,
3041 .arg4_type = ARG_ANYTHING,
3044 BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb,
3045 const u8 *, from, u32, size)
3047 struct ip_tunnel_info *info = skb_tunnel_info(skb);
3048 const struct metadata_dst *md = this_cpu_ptr(md_dst);
3050 if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1))))
3052 if (unlikely(size > IP_TUNNEL_OPTS_MAX))
3055 ip_tunnel_info_opts_set(info, from, size);
3060 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = {
3061 .func = bpf_skb_set_tunnel_opt,
3063 .ret_type = RET_INTEGER,
3064 .arg1_type = ARG_PTR_TO_CTX,
3065 .arg2_type = ARG_PTR_TO_MEM,
3066 .arg3_type = ARG_CONST_SIZE,
3069 static const struct bpf_func_proto *
3070 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which)
3073 struct metadata_dst __percpu *tmp;
3075 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX,
3080 if (cmpxchg(&md_dst, NULL, tmp))
3081 metadata_dst_free_percpu(tmp);
3085 case BPF_FUNC_skb_set_tunnel_key:
3086 return &bpf_skb_set_tunnel_key_proto;
3087 case BPF_FUNC_skb_set_tunnel_opt:
3088 return &bpf_skb_set_tunnel_opt_proto;
3094 BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map,
3097 struct bpf_array *array = container_of(map, struct bpf_array, map);
3098 struct cgroup *cgrp;
3101 sk = skb_to_full_sk(skb);
3102 if (!sk || !sk_fullsock(sk))
3104 if (unlikely(idx >= array->map.max_entries))
3107 cgrp = READ_ONCE(array->ptrs[idx]);
3108 if (unlikely(!cgrp))
3111 return sk_under_cgroup_hierarchy(sk, cgrp);
3114 static const struct bpf_func_proto bpf_skb_under_cgroup_proto = {
3115 .func = bpf_skb_under_cgroup,
3117 .ret_type = RET_INTEGER,
3118 .arg1_type = ARG_PTR_TO_CTX,
3119 .arg2_type = ARG_CONST_MAP_PTR,
3120 .arg3_type = ARG_ANYTHING,
3123 static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff,
3124 unsigned long off, unsigned long len)
3126 memcpy(dst_buff, src_buff + off, len);
3130 BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map,
3131 u64, flags, void *, meta, u64, meta_size)
3133 u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
3135 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
3137 if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data)))
3140 return bpf_event_output(map, flags, meta, meta_size, xdp->data,
3141 xdp_size, bpf_xdp_copy);
3144 static const struct bpf_func_proto bpf_xdp_event_output_proto = {
3145 .func = bpf_xdp_event_output,
3147 .ret_type = RET_INTEGER,
3148 .arg1_type = ARG_PTR_TO_CTX,
3149 .arg2_type = ARG_CONST_MAP_PTR,
3150 .arg3_type = ARG_ANYTHING,
3151 .arg4_type = ARG_PTR_TO_MEM,
3152 .arg5_type = ARG_CONST_SIZE,
3155 BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb)
3157 return skb->sk ? sock_gen_cookie(skb->sk) : 0;
3160 static const struct bpf_func_proto bpf_get_socket_cookie_proto = {
3161 .func = bpf_get_socket_cookie,
3163 .ret_type = RET_INTEGER,
3164 .arg1_type = ARG_PTR_TO_CTX,
3167 BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb)
3169 struct sock *sk = sk_to_full_sk(skb->sk);
3172 if (!sk || !sk_fullsock(sk))
3174 kuid = sock_net_uid(sock_net(sk), sk);
3175 return from_kuid_munged(sock_net(sk)->user_ns, kuid);
3178 static const struct bpf_func_proto bpf_get_socket_uid_proto = {
3179 .func = bpf_get_socket_uid,
3181 .ret_type = RET_INTEGER,
3182 .arg1_type = ARG_PTR_TO_CTX,
3185 BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
3186 int, level, int, optname, char *, optval, int, optlen)
3188 struct sock *sk = bpf_sock->sk;
3192 if (!sk_fullsock(sk))
3195 if (level == SOL_SOCKET) {
3196 if (optlen != sizeof(int))
3198 val = *((int *)optval);
3200 /* Only some socketops are supported */
3203 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
3204 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
3207 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
3208 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
3210 case SO_MAX_PACING_RATE:
3211 sk->sk_max_pacing_rate = val;
3212 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
3213 sk->sk_max_pacing_rate);
3216 sk->sk_priority = val;
3221 sk->sk_rcvlowat = val ? : 1;
3230 } else if (level == SOL_TCP &&
3231 sk->sk_prot->setsockopt == tcp_setsockopt) {
3232 if (optname == TCP_CONGESTION) {
3233 char name[TCP_CA_NAME_MAX];
3234 bool reinit = bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN;
3236 strncpy(name, optval, min_t(long, optlen,
3237 TCP_CA_NAME_MAX-1));
3238 name[TCP_CA_NAME_MAX-1] = 0;
3239 ret = tcp_set_congestion_control(sk, name, false, reinit);
3241 struct tcp_sock *tp = tcp_sk(sk);
3243 if (optlen != sizeof(int))
3246 val = *((int *)optval);
3247 /* Only some options are supported */
3250 if (val <= 0 || tp->data_segs_out > 0)
3255 case TCP_BPF_SNDCWND_CLAMP:
3259 tp->snd_cwnd_clamp = val;
3260 tp->snd_ssthresh = val;
3274 static const struct bpf_func_proto bpf_setsockopt_proto = {
3275 .func = bpf_setsockopt,
3277 .ret_type = RET_INTEGER,
3278 .arg1_type = ARG_PTR_TO_CTX,
3279 .arg2_type = ARG_ANYTHING,
3280 .arg3_type = ARG_ANYTHING,
3281 .arg4_type = ARG_PTR_TO_MEM,
3282 .arg5_type = ARG_CONST_SIZE,
3285 BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
3286 int, level, int, optname, char *, optval, int, optlen)
3288 struct sock *sk = bpf_sock->sk;
3290 if (!sk_fullsock(sk))
3294 if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) {
3295 if (optname == TCP_CONGESTION) {
3296 struct inet_connection_sock *icsk = inet_csk(sk);
3298 if (!icsk->icsk_ca_ops || optlen <= 1)
3300 strncpy(optval, icsk->icsk_ca_ops->name, optlen);
3301 optval[optlen - 1] = 0;
3311 memset(optval, 0, optlen);
3315 static const struct bpf_func_proto bpf_getsockopt_proto = {
3316 .func = bpf_getsockopt,
3318 .ret_type = RET_INTEGER,
3319 .arg1_type = ARG_PTR_TO_CTX,
3320 .arg2_type = ARG_ANYTHING,
3321 .arg3_type = ARG_ANYTHING,
3322 .arg4_type = ARG_PTR_TO_UNINIT_MEM,
3323 .arg5_type = ARG_CONST_SIZE,
3326 static const struct bpf_func_proto *
3327 bpf_base_func_proto(enum bpf_func_id func_id)
3330 case BPF_FUNC_map_lookup_elem:
3331 return &bpf_map_lookup_elem_proto;
3332 case BPF_FUNC_map_update_elem:
3333 return &bpf_map_update_elem_proto;
3334 case BPF_FUNC_map_delete_elem:
3335 return &bpf_map_delete_elem_proto;
3336 case BPF_FUNC_get_prandom_u32:
3337 return &bpf_get_prandom_u32_proto;
3338 case BPF_FUNC_get_smp_processor_id:
3339 return &bpf_get_raw_smp_processor_id_proto;
3340 case BPF_FUNC_get_numa_node_id:
3341 return &bpf_get_numa_node_id_proto;
3342 case BPF_FUNC_tail_call:
3343 return &bpf_tail_call_proto;
3344 case BPF_FUNC_ktime_get_ns:
3345 return &bpf_ktime_get_ns_proto;
3346 case BPF_FUNC_trace_printk:
3347 if (capable(CAP_SYS_ADMIN))
3348 return bpf_get_trace_printk_proto();
3354 static const struct bpf_func_proto *
3355 sock_filter_func_proto(enum bpf_func_id func_id)
3358 /* inet and inet6 sockets are created in a process
3359 * context so there is always a valid uid/gid
3361 case BPF_FUNC_get_current_uid_gid:
3362 return &bpf_get_current_uid_gid_proto;
3364 return bpf_base_func_proto(func_id);
3368 static const struct bpf_func_proto *
3369 sk_filter_func_proto(enum bpf_func_id func_id)
3372 case BPF_FUNC_skb_load_bytes:
3373 return &bpf_skb_load_bytes_proto;
3374 case BPF_FUNC_get_socket_cookie:
3375 return &bpf_get_socket_cookie_proto;
3376 case BPF_FUNC_get_socket_uid:
3377 return &bpf_get_socket_uid_proto;
3379 return bpf_base_func_proto(func_id);
3383 static const struct bpf_func_proto *
3384 tc_cls_act_func_proto(enum bpf_func_id func_id)
3387 case BPF_FUNC_skb_store_bytes:
3388 return &bpf_skb_store_bytes_proto;
3389 case BPF_FUNC_skb_load_bytes:
3390 return &bpf_skb_load_bytes_proto;
3391 case BPF_FUNC_skb_pull_data:
3392 return &bpf_skb_pull_data_proto;
3393 case BPF_FUNC_csum_diff:
3394 return &bpf_csum_diff_proto;
3395 case BPF_FUNC_csum_update:
3396 return &bpf_csum_update_proto;
3397 case BPF_FUNC_l3_csum_replace:
3398 return &bpf_l3_csum_replace_proto;
3399 case BPF_FUNC_l4_csum_replace:
3400 return &bpf_l4_csum_replace_proto;
3401 case BPF_FUNC_clone_redirect:
3402 return &bpf_clone_redirect_proto;
3403 case BPF_FUNC_get_cgroup_classid:
3404 return &bpf_get_cgroup_classid_proto;
3405 case BPF_FUNC_skb_vlan_push:
3406 return &bpf_skb_vlan_push_proto;
3407 case BPF_FUNC_skb_vlan_pop:
3408 return &bpf_skb_vlan_pop_proto;
3409 case BPF_FUNC_skb_change_proto:
3410 return &bpf_skb_change_proto_proto;
3411 case BPF_FUNC_skb_change_type:
3412 return &bpf_skb_change_type_proto;
3413 case BPF_FUNC_skb_adjust_room:
3414 return &bpf_skb_adjust_room_proto;
3415 case BPF_FUNC_skb_change_tail:
3416 return &bpf_skb_change_tail_proto;
3417 case BPF_FUNC_skb_get_tunnel_key:
3418 return &bpf_skb_get_tunnel_key_proto;
3419 case BPF_FUNC_skb_set_tunnel_key:
3420 return bpf_get_skb_set_tunnel_proto(func_id);
3421 case BPF_FUNC_skb_get_tunnel_opt:
3422 return &bpf_skb_get_tunnel_opt_proto;
3423 case BPF_FUNC_skb_set_tunnel_opt:
3424 return bpf_get_skb_set_tunnel_proto(func_id);
3425 case BPF_FUNC_redirect:
3426 return &bpf_redirect_proto;
3427 case BPF_FUNC_get_route_realm:
3428 return &bpf_get_route_realm_proto;
3429 case BPF_FUNC_get_hash_recalc:
3430 return &bpf_get_hash_recalc_proto;
3431 case BPF_FUNC_set_hash_invalid:
3432 return &bpf_set_hash_invalid_proto;
3433 case BPF_FUNC_set_hash:
3434 return &bpf_set_hash_proto;
3435 case BPF_FUNC_perf_event_output:
3436 return &bpf_skb_event_output_proto;
3437 case BPF_FUNC_get_smp_processor_id:
3438 return &bpf_get_smp_processor_id_proto;
3439 case BPF_FUNC_skb_under_cgroup:
3440 return &bpf_skb_under_cgroup_proto;
3441 case BPF_FUNC_get_socket_cookie:
3442 return &bpf_get_socket_cookie_proto;
3443 case BPF_FUNC_get_socket_uid:
3444 return &bpf_get_socket_uid_proto;
3446 return bpf_base_func_proto(func_id);
3450 static const struct bpf_func_proto *
3451 xdp_func_proto(enum bpf_func_id func_id)
3454 case BPF_FUNC_perf_event_output:
3455 return &bpf_xdp_event_output_proto;
3456 case BPF_FUNC_get_smp_processor_id:
3457 return &bpf_get_smp_processor_id_proto;
3458 case BPF_FUNC_xdp_adjust_head:
3459 return &bpf_xdp_adjust_head_proto;
3460 case BPF_FUNC_xdp_adjust_meta:
3461 return &bpf_xdp_adjust_meta_proto;
3462 case BPF_FUNC_redirect:
3463 return &bpf_xdp_redirect_proto;
3464 case BPF_FUNC_redirect_map:
3465 return &bpf_xdp_redirect_map_proto;
3467 return bpf_base_func_proto(func_id);
3471 static const struct bpf_func_proto *
3472 lwt_inout_func_proto(enum bpf_func_id func_id)
3475 case BPF_FUNC_skb_load_bytes:
3476 return &bpf_skb_load_bytes_proto;
3477 case BPF_FUNC_skb_pull_data:
3478 return &bpf_skb_pull_data_proto;
3479 case BPF_FUNC_csum_diff:
3480 return &bpf_csum_diff_proto;
3481 case BPF_FUNC_get_cgroup_classid:
3482 return &bpf_get_cgroup_classid_proto;
3483 case BPF_FUNC_get_route_realm:
3484 return &bpf_get_route_realm_proto;
3485 case BPF_FUNC_get_hash_recalc:
3486 return &bpf_get_hash_recalc_proto;
3487 case BPF_FUNC_perf_event_output:
3488 return &bpf_skb_event_output_proto;
3489 case BPF_FUNC_get_smp_processor_id:
3490 return &bpf_get_smp_processor_id_proto;
3491 case BPF_FUNC_skb_under_cgroup:
3492 return &bpf_skb_under_cgroup_proto;
3494 return bpf_base_func_proto(func_id);
3498 static const struct bpf_func_proto *
3499 sock_ops_func_proto(enum bpf_func_id func_id)
3502 case BPF_FUNC_setsockopt:
3503 return &bpf_setsockopt_proto;
3504 case BPF_FUNC_getsockopt:
3505 return &bpf_getsockopt_proto;
3506 case BPF_FUNC_sock_map_update:
3507 return &bpf_sock_map_update_proto;
3509 return bpf_base_func_proto(func_id);
3513 static const struct bpf_func_proto *sk_skb_func_proto(enum bpf_func_id func_id)
3516 case BPF_FUNC_skb_store_bytes:
3517 return &bpf_skb_store_bytes_proto;
3518 case BPF_FUNC_skb_load_bytes:
3519 return &bpf_skb_load_bytes_proto;
3520 case BPF_FUNC_skb_pull_data:
3521 return &bpf_skb_pull_data_proto;
3522 case BPF_FUNC_skb_change_tail:
3523 return &bpf_skb_change_tail_proto;
3524 case BPF_FUNC_skb_change_head:
3525 return &bpf_skb_change_head_proto;
3526 case BPF_FUNC_get_socket_cookie:
3527 return &bpf_get_socket_cookie_proto;
3528 case BPF_FUNC_get_socket_uid:
3529 return &bpf_get_socket_uid_proto;
3530 case BPF_FUNC_sk_redirect_map:
3531 return &bpf_sk_redirect_map_proto;
3533 return bpf_base_func_proto(func_id);
3537 static const struct bpf_func_proto *
3538 lwt_xmit_func_proto(enum bpf_func_id func_id)
3541 case BPF_FUNC_skb_get_tunnel_key:
3542 return &bpf_skb_get_tunnel_key_proto;
3543 case BPF_FUNC_skb_set_tunnel_key:
3544 return bpf_get_skb_set_tunnel_proto(func_id);
3545 case BPF_FUNC_skb_get_tunnel_opt:
3546 return &bpf_skb_get_tunnel_opt_proto;
3547 case BPF_FUNC_skb_set_tunnel_opt:
3548 return bpf_get_skb_set_tunnel_proto(func_id);
3549 case BPF_FUNC_redirect:
3550 return &bpf_redirect_proto;
3551 case BPF_FUNC_clone_redirect:
3552 return &bpf_clone_redirect_proto;
3553 case BPF_FUNC_skb_change_tail:
3554 return &bpf_skb_change_tail_proto;
3555 case BPF_FUNC_skb_change_head:
3556 return &bpf_skb_change_head_proto;
3557 case BPF_FUNC_skb_store_bytes:
3558 return &bpf_skb_store_bytes_proto;
3559 case BPF_FUNC_csum_update:
3560 return &bpf_csum_update_proto;
3561 case BPF_FUNC_l3_csum_replace:
3562 return &bpf_l3_csum_replace_proto;
3563 case BPF_FUNC_l4_csum_replace:
3564 return &bpf_l4_csum_replace_proto;
3565 case BPF_FUNC_set_hash_invalid:
3566 return &bpf_set_hash_invalid_proto;
3568 return lwt_inout_func_proto(func_id);
3572 static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type,
3573 struct bpf_insn_access_aux *info)
3575 const int size_default = sizeof(__u32);
3577 if (off < 0 || off >= sizeof(struct __sk_buff))
3580 /* The verifier guarantees that size > 0. */
3581 if (off % size != 0)
3585 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
3586 if (off + size > offsetofend(struct __sk_buff, cb[4]))
3589 case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]):
3590 case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]):
3591 case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4):
3592 case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4):
3593 case bpf_ctx_range(struct __sk_buff, data):
3594 case bpf_ctx_range(struct __sk_buff, data_meta):
3595 case bpf_ctx_range(struct __sk_buff, data_end):
3596 if (size != size_default)
3600 /* Only narrow read access allowed for now. */
3601 if (type == BPF_WRITE) {
3602 if (size != size_default)
3605 bpf_ctx_record_field_size(info, size_default);
3606 if (!bpf_ctx_narrow_access_ok(off, size, size_default))
3614 static bool sk_filter_is_valid_access(int off, int size,
3615 enum bpf_access_type type,
3616 struct bpf_insn_access_aux *info)
3619 case bpf_ctx_range(struct __sk_buff, tc_classid):
3620 case bpf_ctx_range(struct __sk_buff, data):
3621 case bpf_ctx_range(struct __sk_buff, data_meta):
3622 case bpf_ctx_range(struct __sk_buff, data_end):
3623 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
3627 if (type == BPF_WRITE) {
3629 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
3636 return bpf_skb_is_valid_access(off, size, type, info);
3639 static bool lwt_is_valid_access(int off, int size,
3640 enum bpf_access_type type,
3641 struct bpf_insn_access_aux *info)
3644 case bpf_ctx_range(struct __sk_buff, tc_classid):
3645 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
3646 case bpf_ctx_range(struct __sk_buff, data_meta):
3650 if (type == BPF_WRITE) {
3652 case bpf_ctx_range(struct __sk_buff, mark):
3653 case bpf_ctx_range(struct __sk_buff, priority):
3654 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
3662 case bpf_ctx_range(struct __sk_buff, data):
3663 info->reg_type = PTR_TO_PACKET;
3665 case bpf_ctx_range(struct __sk_buff, data_end):
3666 info->reg_type = PTR_TO_PACKET_END;
3670 return bpf_skb_is_valid_access(off, size, type, info);
3673 static bool sock_filter_is_valid_access(int off, int size,
3674 enum bpf_access_type type,
3675 struct bpf_insn_access_aux *info)
3677 if (type == BPF_WRITE) {
3679 case offsetof(struct bpf_sock, bound_dev_if):
3680 case offsetof(struct bpf_sock, mark):
3681 case offsetof(struct bpf_sock, priority):
3688 if (off < 0 || off + size > sizeof(struct bpf_sock))
3690 /* The verifier guarantees that size > 0. */
3691 if (off % size != 0)
3693 if (size != sizeof(__u32))
3699 static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write,
3700 const struct bpf_prog *prog, int drop_verdict)
3702 struct bpf_insn *insn = insn_buf;
3707 /* if (!skb->cloned)
3710 * (Fast-path, otherwise approximation that we might be
3711 * a clone, do the rest in helper.)
3713 *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET());
3714 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK);
3715 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7);
3717 /* ret = bpf_skb_pull_data(skb, 0); */
3718 *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
3719 *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2);
3720 *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
3721 BPF_FUNC_skb_pull_data);
3724 * return TC_ACT_SHOT;
3726 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2);
3727 *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict);
3728 *insn++ = BPF_EXIT_INSN();
3731 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6);
3733 *insn++ = prog->insnsi[0];
3735 return insn - insn_buf;
3738 static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write,
3739 const struct bpf_prog *prog)
3741 return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT);
3744 static bool tc_cls_act_is_valid_access(int off, int size,
3745 enum bpf_access_type type,
3746 struct bpf_insn_access_aux *info)
3748 if (type == BPF_WRITE) {
3750 case bpf_ctx_range(struct __sk_buff, mark):
3751 case bpf_ctx_range(struct __sk_buff, tc_index):
3752 case bpf_ctx_range(struct __sk_buff, priority):
3753 case bpf_ctx_range(struct __sk_buff, tc_classid):
3754 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
3762 case bpf_ctx_range(struct __sk_buff, data):
3763 info->reg_type = PTR_TO_PACKET;
3765 case bpf_ctx_range(struct __sk_buff, data_meta):
3766 info->reg_type = PTR_TO_PACKET_META;
3768 case bpf_ctx_range(struct __sk_buff, data_end):
3769 info->reg_type = PTR_TO_PACKET_END;
3771 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
3775 return bpf_skb_is_valid_access(off, size, type, info);
3778 static bool __is_valid_xdp_access(int off, int size)
3780 if (off < 0 || off >= sizeof(struct xdp_md))
3782 if (off % size != 0)
3784 if (size != sizeof(__u32))
3790 static bool xdp_is_valid_access(int off, int size,
3791 enum bpf_access_type type,
3792 struct bpf_insn_access_aux *info)
3794 if (type == BPF_WRITE)
3798 case offsetof(struct xdp_md, data):
3799 info->reg_type = PTR_TO_PACKET;
3801 case offsetof(struct xdp_md, data_meta):
3802 info->reg_type = PTR_TO_PACKET_META;
3804 case offsetof(struct xdp_md, data_end):
3805 info->reg_type = PTR_TO_PACKET_END;
3809 return __is_valid_xdp_access(off, size);
3812 void bpf_warn_invalid_xdp_action(u32 act)
3814 const u32 act_max = XDP_REDIRECT;
3816 WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n",
3817 act > act_max ? "Illegal" : "Driver unsupported",
3820 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action);
3822 static bool __is_valid_sock_ops_access(int off, int size)
3824 if (off < 0 || off >= sizeof(struct bpf_sock_ops))
3826 /* The verifier guarantees that size > 0. */
3827 if (off % size != 0)
3829 if (size != sizeof(__u32))
3835 static bool sock_ops_is_valid_access(int off, int size,
3836 enum bpf_access_type type,
3837 struct bpf_insn_access_aux *info)
3839 if (type == BPF_WRITE) {
3841 case offsetof(struct bpf_sock_ops, op) ...
3842 offsetof(struct bpf_sock_ops, replylong[3]):
3849 return __is_valid_sock_ops_access(off, size);
3852 static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write,
3853 const struct bpf_prog *prog)
3855 return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP);
3858 static bool sk_skb_is_valid_access(int off, int size,
3859 enum bpf_access_type type,
3860 struct bpf_insn_access_aux *info)
3863 case bpf_ctx_range(struct __sk_buff, tc_classid):
3864 case bpf_ctx_range(struct __sk_buff, data_meta):
3868 if (type == BPF_WRITE) {
3870 case bpf_ctx_range(struct __sk_buff, tc_index):
3871 case bpf_ctx_range(struct __sk_buff, priority):
3879 case bpf_ctx_range(struct __sk_buff, mark):
3881 case bpf_ctx_range(struct __sk_buff, data):
3882 info->reg_type = PTR_TO_PACKET;
3884 case bpf_ctx_range(struct __sk_buff, data_end):
3885 info->reg_type = PTR_TO_PACKET_END;
3889 return bpf_skb_is_valid_access(off, size, type, info);
3892 static u32 bpf_convert_ctx_access(enum bpf_access_type type,
3893 const struct bpf_insn *si,
3894 struct bpf_insn *insn_buf,
3895 struct bpf_prog *prog, u32 *target_size)
3897 struct bpf_insn *insn = insn_buf;
3901 case offsetof(struct __sk_buff, len):
3902 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
3903 bpf_target_off(struct sk_buff, len, 4,
3907 case offsetof(struct __sk_buff, protocol):
3908 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
3909 bpf_target_off(struct sk_buff, protocol, 2,
3913 case offsetof(struct __sk_buff, vlan_proto):
3914 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
3915 bpf_target_off(struct sk_buff, vlan_proto, 2,
3919 case offsetof(struct __sk_buff, priority):
3920 if (type == BPF_WRITE)
3921 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
3922 bpf_target_off(struct sk_buff, priority, 4,
3925 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
3926 bpf_target_off(struct sk_buff, priority, 4,
3930 case offsetof(struct __sk_buff, ingress_ifindex):
3931 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
3932 bpf_target_off(struct sk_buff, skb_iif, 4,
3936 case offsetof(struct __sk_buff, ifindex):
3937 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
3938 si->dst_reg, si->src_reg,
3939 offsetof(struct sk_buff, dev));
3940 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
3941 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
3942 bpf_target_off(struct net_device, ifindex, 4,
3946 case offsetof(struct __sk_buff, hash):
3947 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
3948 bpf_target_off(struct sk_buff, hash, 4,
3952 case offsetof(struct __sk_buff, mark):
3953 if (type == BPF_WRITE)
3954 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
3955 bpf_target_off(struct sk_buff, mark, 4,
3958 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
3959 bpf_target_off(struct sk_buff, mark, 4,
3963 case offsetof(struct __sk_buff, pkt_type):
3965 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg,
3967 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX);
3968 #ifdef __BIG_ENDIAN_BITFIELD
3969 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5);
3973 case offsetof(struct __sk_buff, queue_mapping):
3974 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
3975 bpf_target_off(struct sk_buff, queue_mapping, 2,
3979 case offsetof(struct __sk_buff, vlan_present):
3980 case offsetof(struct __sk_buff, vlan_tci):
3981 BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000);
3983 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
3984 bpf_target_off(struct sk_buff, vlan_tci, 2,
3986 if (si->off == offsetof(struct __sk_buff, vlan_tci)) {
3987 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg,
3990 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 12);
3991 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1);
3995 case offsetof(struct __sk_buff, cb[0]) ...
3996 offsetofend(struct __sk_buff, cb[4]) - 1:
3997 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, data) < 20);
3998 BUILD_BUG_ON((offsetof(struct sk_buff, cb) +
3999 offsetof(struct qdisc_skb_cb, data)) %
4002 prog->cb_access = 1;
4004 off -= offsetof(struct __sk_buff, cb[0]);
4005 off += offsetof(struct sk_buff, cb);
4006 off += offsetof(struct qdisc_skb_cb, data);
4007 if (type == BPF_WRITE)
4008 *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg,
4011 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg,
4015 case offsetof(struct __sk_buff, tc_classid):
4016 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, tc_classid) != 2);
4019 off -= offsetof(struct __sk_buff, tc_classid);
4020 off += offsetof(struct sk_buff, cb);
4021 off += offsetof(struct qdisc_skb_cb, tc_classid);
4023 if (type == BPF_WRITE)
4024 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg,
4027 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg,
4031 case offsetof(struct __sk_buff, data):
4032 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
4033 si->dst_reg, si->src_reg,
4034 offsetof(struct sk_buff, data));
4037 case offsetof(struct __sk_buff, data_meta):
4039 off -= offsetof(struct __sk_buff, data_meta);
4040 off += offsetof(struct sk_buff, cb);
4041 off += offsetof(struct bpf_skb_data_end, data_meta);
4042 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
4046 case offsetof(struct __sk_buff, data_end):
4048 off -= offsetof(struct __sk_buff, data_end);
4049 off += offsetof(struct sk_buff, cb);
4050 off += offsetof(struct bpf_skb_data_end, data_end);
4051 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
4055 case offsetof(struct __sk_buff, tc_index):
4056 #ifdef CONFIG_NET_SCHED
4057 if (type == BPF_WRITE)
4058 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg,
4059 bpf_target_off(struct sk_buff, tc_index, 2,
4062 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
4063 bpf_target_off(struct sk_buff, tc_index, 2,
4067 if (type == BPF_WRITE)
4068 *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg);
4070 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
4074 case offsetof(struct __sk_buff, napi_id):
4075 #if defined(CONFIG_NET_RX_BUSY_POLL)
4076 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4077 bpf_target_off(struct sk_buff, napi_id, 4,
4079 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1);
4080 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
4083 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
4086 case offsetof(struct __sk_buff, family):
4087 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2);
4089 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4090 si->dst_reg, si->src_reg,
4091 offsetof(struct sk_buff, sk));
4092 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4093 bpf_target_off(struct sock_common,
4097 case offsetof(struct __sk_buff, remote_ip4):
4098 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4);
4100 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4101 si->dst_reg, si->src_reg,
4102 offsetof(struct sk_buff, sk));
4103 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4104 bpf_target_off(struct sock_common,
4108 case offsetof(struct __sk_buff, local_ip4):
4109 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4110 skc_rcv_saddr) != 4);
4112 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4113 si->dst_reg, si->src_reg,
4114 offsetof(struct sk_buff, sk));
4115 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4116 bpf_target_off(struct sock_common,
4120 case offsetof(struct __sk_buff, remote_ip6[0]) ...
4121 offsetof(struct __sk_buff, remote_ip6[3]):
4122 #if IS_ENABLED(CONFIG_IPV6)
4123 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4124 skc_v6_daddr.s6_addr32[0]) != 4);
4127 off -= offsetof(struct __sk_buff, remote_ip6[0]);
4129 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4130 si->dst_reg, si->src_reg,
4131 offsetof(struct sk_buff, sk));
4132 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4133 offsetof(struct sock_common,
4134 skc_v6_daddr.s6_addr32[0]) +
4137 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
4140 case offsetof(struct __sk_buff, local_ip6[0]) ...
4141 offsetof(struct __sk_buff, local_ip6[3]):
4142 #if IS_ENABLED(CONFIG_IPV6)
4143 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4144 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
4147 off -= offsetof(struct __sk_buff, local_ip6[0]);
4149 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4150 si->dst_reg, si->src_reg,
4151 offsetof(struct sk_buff, sk));
4152 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4153 offsetof(struct sock_common,
4154 skc_v6_rcv_saddr.s6_addr32[0]) +
4157 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
4161 case offsetof(struct __sk_buff, remote_port):
4162 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2);
4164 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4165 si->dst_reg, si->src_reg,
4166 offsetof(struct sk_buff, sk));
4167 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4168 bpf_target_off(struct sock_common,
4171 #ifndef __BIG_ENDIAN_BITFIELD
4172 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
4176 case offsetof(struct __sk_buff, local_port):
4177 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2);
4179 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4180 si->dst_reg, si->src_reg,
4181 offsetof(struct sk_buff, sk));
4182 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4183 bpf_target_off(struct sock_common,
4184 skc_num, 2, target_size));
4188 return insn - insn_buf;
4191 static u32 sock_filter_convert_ctx_access(enum bpf_access_type type,
4192 const struct bpf_insn *si,
4193 struct bpf_insn *insn_buf,
4194 struct bpf_prog *prog, u32 *target_size)
4196 struct bpf_insn *insn = insn_buf;
4199 case offsetof(struct bpf_sock, bound_dev_if):
4200 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_bound_dev_if) != 4);
4202 if (type == BPF_WRITE)
4203 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
4204 offsetof(struct sock, sk_bound_dev_if));
4206 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4207 offsetof(struct sock, sk_bound_dev_if));
4210 case offsetof(struct bpf_sock, mark):
4211 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_mark) != 4);
4213 if (type == BPF_WRITE)
4214 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
4215 offsetof(struct sock, sk_mark));
4217 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4218 offsetof(struct sock, sk_mark));
4221 case offsetof(struct bpf_sock, priority):
4222 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_priority) != 4);
4224 if (type == BPF_WRITE)
4225 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
4226 offsetof(struct sock, sk_priority));
4228 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4229 offsetof(struct sock, sk_priority));
4232 case offsetof(struct bpf_sock, family):
4233 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_family) != 2);
4235 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
4236 offsetof(struct sock, sk_family));
4239 case offsetof(struct bpf_sock, type):
4240 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4241 offsetof(struct sock, __sk_flags_offset));
4242 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK);
4243 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT);
4246 case offsetof(struct bpf_sock, protocol):
4247 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4248 offsetof(struct sock, __sk_flags_offset));
4249 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK);
4250 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_PROTO_SHIFT);
4254 return insn - insn_buf;
4257 static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type,
4258 const struct bpf_insn *si,
4259 struct bpf_insn *insn_buf,
4260 struct bpf_prog *prog, u32 *target_size)
4262 struct bpf_insn *insn = insn_buf;
4265 case offsetof(struct __sk_buff, ifindex):
4266 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
4267 si->dst_reg, si->src_reg,
4268 offsetof(struct sk_buff, dev));
4269 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4270 bpf_target_off(struct net_device, ifindex, 4,
4274 return bpf_convert_ctx_access(type, si, insn_buf, prog,
4278 return insn - insn_buf;
4281 static u32 xdp_convert_ctx_access(enum bpf_access_type type,
4282 const struct bpf_insn *si,
4283 struct bpf_insn *insn_buf,
4284 struct bpf_prog *prog, u32 *target_size)
4286 struct bpf_insn *insn = insn_buf;
4289 case offsetof(struct xdp_md, data):
4290 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data),
4291 si->dst_reg, si->src_reg,
4292 offsetof(struct xdp_buff, data));
4294 case offsetof(struct xdp_md, data_meta):
4295 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta),
4296 si->dst_reg, si->src_reg,
4297 offsetof(struct xdp_buff, data_meta));
4299 case offsetof(struct xdp_md, data_end):
4300 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end),
4301 si->dst_reg, si->src_reg,
4302 offsetof(struct xdp_buff, data_end));
4306 return insn - insn_buf;
4309 static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
4310 const struct bpf_insn *si,
4311 struct bpf_insn *insn_buf,
4312 struct bpf_prog *prog,
4315 struct bpf_insn *insn = insn_buf;
4319 case offsetof(struct bpf_sock_ops, op) ...
4320 offsetof(struct bpf_sock_ops, replylong[3]):
4321 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, op) !=
4322 FIELD_SIZEOF(struct bpf_sock_ops_kern, op));
4323 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, reply) !=
4324 FIELD_SIZEOF(struct bpf_sock_ops_kern, reply));
4325 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, replylong) !=
4326 FIELD_SIZEOF(struct bpf_sock_ops_kern, replylong));
4328 off -= offsetof(struct bpf_sock_ops, op);
4329 off += offsetof(struct bpf_sock_ops_kern, op);
4330 if (type == BPF_WRITE)
4331 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
4334 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4338 case offsetof(struct bpf_sock_ops, family):
4339 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2);
4341 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4342 struct bpf_sock_ops_kern, sk),
4343 si->dst_reg, si->src_reg,
4344 offsetof(struct bpf_sock_ops_kern, sk));
4345 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4346 offsetof(struct sock_common, skc_family));
4349 case offsetof(struct bpf_sock_ops, remote_ip4):
4350 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4);
4352 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4353 struct bpf_sock_ops_kern, sk),
4354 si->dst_reg, si->src_reg,
4355 offsetof(struct bpf_sock_ops_kern, sk));
4356 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4357 offsetof(struct sock_common, skc_daddr));
4360 case offsetof(struct bpf_sock_ops, local_ip4):
4361 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_rcv_saddr) != 4);
4363 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4364 struct bpf_sock_ops_kern, sk),
4365 si->dst_reg, si->src_reg,
4366 offsetof(struct bpf_sock_ops_kern, sk));
4367 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4368 offsetof(struct sock_common,
4372 case offsetof(struct bpf_sock_ops, remote_ip6[0]) ...
4373 offsetof(struct bpf_sock_ops, remote_ip6[3]):
4374 #if IS_ENABLED(CONFIG_IPV6)
4375 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4376 skc_v6_daddr.s6_addr32[0]) != 4);
4379 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]);
4380 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4381 struct bpf_sock_ops_kern, sk),
4382 si->dst_reg, si->src_reg,
4383 offsetof(struct bpf_sock_ops_kern, sk));
4384 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4385 offsetof(struct sock_common,
4386 skc_v6_daddr.s6_addr32[0]) +
4389 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
4393 case offsetof(struct bpf_sock_ops, local_ip6[0]) ...
4394 offsetof(struct bpf_sock_ops, local_ip6[3]):
4395 #if IS_ENABLED(CONFIG_IPV6)
4396 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4397 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
4400 off -= offsetof(struct bpf_sock_ops, local_ip6[0]);
4401 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4402 struct bpf_sock_ops_kern, sk),
4403 si->dst_reg, si->src_reg,
4404 offsetof(struct bpf_sock_ops_kern, sk));
4405 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4406 offsetof(struct sock_common,
4407 skc_v6_rcv_saddr.s6_addr32[0]) +
4410 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
4414 case offsetof(struct bpf_sock_ops, remote_port):
4415 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2);
4417 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4418 struct bpf_sock_ops_kern, sk),
4419 si->dst_reg, si->src_reg,
4420 offsetof(struct bpf_sock_ops_kern, sk));
4421 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4422 offsetof(struct sock_common, skc_dport));
4423 #ifndef __BIG_ENDIAN_BITFIELD
4424 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
4428 case offsetof(struct bpf_sock_ops, local_port):
4429 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2);
4431 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4432 struct bpf_sock_ops_kern, sk),
4433 si->dst_reg, si->src_reg,
4434 offsetof(struct bpf_sock_ops_kern, sk));
4435 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4436 offsetof(struct sock_common, skc_num));
4439 return insn - insn_buf;
4442 static u32 sk_skb_convert_ctx_access(enum bpf_access_type type,
4443 const struct bpf_insn *si,
4444 struct bpf_insn *insn_buf,
4445 struct bpf_prog *prog, u32 *target_size)
4447 struct bpf_insn *insn = insn_buf;
4451 case offsetof(struct __sk_buff, data_end):
4453 off -= offsetof(struct __sk_buff, data_end);
4454 off += offsetof(struct sk_buff, cb);
4455 off += offsetof(struct tcp_skb_cb, bpf.data_end);
4456 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
4460 return bpf_convert_ctx_access(type, si, insn_buf, prog,
4464 return insn - insn_buf;
4467 const struct bpf_verifier_ops sk_filter_verifier_ops = {
4468 .get_func_proto = sk_filter_func_proto,
4469 .is_valid_access = sk_filter_is_valid_access,
4470 .convert_ctx_access = bpf_convert_ctx_access,
4473 const struct bpf_prog_ops sk_filter_prog_ops = {
4476 const struct bpf_verifier_ops tc_cls_act_verifier_ops = {
4477 .get_func_proto = tc_cls_act_func_proto,
4478 .is_valid_access = tc_cls_act_is_valid_access,
4479 .convert_ctx_access = tc_cls_act_convert_ctx_access,
4480 .gen_prologue = tc_cls_act_prologue,
4483 const struct bpf_prog_ops tc_cls_act_prog_ops = {
4484 .test_run = bpf_prog_test_run_skb,
4487 const struct bpf_verifier_ops xdp_verifier_ops = {
4488 .get_func_proto = xdp_func_proto,
4489 .is_valid_access = xdp_is_valid_access,
4490 .convert_ctx_access = xdp_convert_ctx_access,
4493 const struct bpf_prog_ops xdp_prog_ops = {
4494 .test_run = bpf_prog_test_run_xdp,
4497 const struct bpf_verifier_ops cg_skb_verifier_ops = {
4498 .get_func_proto = sk_filter_func_proto,
4499 .is_valid_access = sk_filter_is_valid_access,
4500 .convert_ctx_access = bpf_convert_ctx_access,
4503 const struct bpf_prog_ops cg_skb_prog_ops = {
4504 .test_run = bpf_prog_test_run_skb,
4507 const struct bpf_verifier_ops lwt_inout_verifier_ops = {
4508 .get_func_proto = lwt_inout_func_proto,
4509 .is_valid_access = lwt_is_valid_access,
4510 .convert_ctx_access = bpf_convert_ctx_access,
4513 const struct bpf_prog_ops lwt_inout_prog_ops = {
4514 .test_run = bpf_prog_test_run_skb,
4517 const struct bpf_verifier_ops lwt_xmit_verifier_ops = {
4518 .get_func_proto = lwt_xmit_func_proto,
4519 .is_valid_access = lwt_is_valid_access,
4520 .convert_ctx_access = bpf_convert_ctx_access,
4521 .gen_prologue = tc_cls_act_prologue,
4524 const struct bpf_prog_ops lwt_xmit_prog_ops = {
4525 .test_run = bpf_prog_test_run_skb,
4528 const struct bpf_verifier_ops cg_sock_verifier_ops = {
4529 .get_func_proto = sock_filter_func_proto,
4530 .is_valid_access = sock_filter_is_valid_access,
4531 .convert_ctx_access = sock_filter_convert_ctx_access,
4534 const struct bpf_prog_ops cg_sock_prog_ops = {
4537 const struct bpf_verifier_ops sock_ops_verifier_ops = {
4538 .get_func_proto = sock_ops_func_proto,
4539 .is_valid_access = sock_ops_is_valid_access,
4540 .convert_ctx_access = sock_ops_convert_ctx_access,
4543 const struct bpf_prog_ops sock_ops_prog_ops = {
4546 const struct bpf_verifier_ops sk_skb_verifier_ops = {
4547 .get_func_proto = sk_skb_func_proto,
4548 .is_valid_access = sk_skb_is_valid_access,
4549 .convert_ctx_access = sk_skb_convert_ctx_access,
4550 .gen_prologue = sk_skb_prologue,
4553 const struct bpf_prog_ops sk_skb_prog_ops = {
4556 int sk_detach_filter(struct sock *sk)
4559 struct sk_filter *filter;
4561 if (sock_flag(sk, SOCK_FILTER_LOCKED))
4564 filter = rcu_dereference_protected(sk->sk_filter,
4565 lockdep_sock_is_held(sk));
4567 RCU_INIT_POINTER(sk->sk_filter, NULL);
4568 sk_filter_uncharge(sk, filter);
4574 EXPORT_SYMBOL_GPL(sk_detach_filter);
4576 int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf,
4579 struct sock_fprog_kern *fprog;
4580 struct sk_filter *filter;
4584 filter = rcu_dereference_protected(sk->sk_filter,
4585 lockdep_sock_is_held(sk));
4589 /* We're copying the filter that has been originally attached,
4590 * so no conversion/decode needed anymore. eBPF programs that
4591 * have no original program cannot be dumped through this.
4594 fprog = filter->prog->orig_prog;
4600 /* User space only enquires number of filter blocks. */
4604 if (len < fprog->len)
4608 if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog)))
4611 /* Instead of bytes, the API requests to return the number