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 if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) ||
462 fp->code == (BPF_ALU | BPF_MOD | BPF_X))
463 *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X);
465 *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k);
468 /* Jump transformation cannot use BPF block macros
469 * everywhere as offset calculation and target updates
470 * require a bit more work than the rest, i.e. jump
471 * opcodes map as-is, but offsets need adjustment.
474 #define BPF_EMIT_JMP \
476 if (target >= len || target < 0) \
478 insn->off = addrs ? addrs[target] - addrs[i] - 1 : 0; \
479 /* Adjust pc relative offset for 2nd or 3rd insn. */ \
480 insn->off -= insn - tmp_insns; \
483 case BPF_JMP | BPF_JA:
484 target = i + fp->k + 1;
485 insn->code = fp->code;
489 case BPF_JMP | BPF_JEQ | BPF_K:
490 case BPF_JMP | BPF_JEQ | BPF_X:
491 case BPF_JMP | BPF_JSET | BPF_K:
492 case BPF_JMP | BPF_JSET | BPF_X:
493 case BPF_JMP | BPF_JGT | BPF_K:
494 case BPF_JMP | BPF_JGT | BPF_X:
495 case BPF_JMP | BPF_JGE | BPF_K:
496 case BPF_JMP | BPF_JGE | BPF_X:
497 if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) {
498 /* BPF immediates are signed, zero extend
499 * immediate into tmp register and use it
502 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k);
504 insn->dst_reg = BPF_REG_A;
505 insn->src_reg = BPF_REG_TMP;
508 insn->dst_reg = BPF_REG_A;
510 bpf_src = BPF_SRC(fp->code);
511 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0;
514 /* Common case where 'jump_false' is next insn. */
516 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
517 target = i + fp->jt + 1;
522 /* Convert some jumps when 'jump_true' is next insn. */
524 switch (BPF_OP(fp->code)) {
526 insn->code = BPF_JMP | BPF_JNE | bpf_src;
529 insn->code = BPF_JMP | BPF_JLE | bpf_src;
532 insn->code = BPF_JMP | BPF_JLT | bpf_src;
538 target = i + fp->jf + 1;
543 /* Other jumps are mapped into two insns: Jxx and JA. */
544 target = i + fp->jt + 1;
545 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
549 insn->code = BPF_JMP | BPF_JA;
550 target = i + fp->jf + 1;
554 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */
555 case BPF_LDX | BPF_MSH | BPF_B:
557 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_A);
558 /* A = BPF_R0 = *(u8 *) (skb->data + K) */
559 *insn++ = BPF_LD_ABS(BPF_B, fp->k);
561 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf);
563 *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2);
565 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
567 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP);
570 /* RET_K is remaped into 2 insns. RET_A case doesn't need an
571 * extra mov as BPF_REG_0 is already mapped into BPF_REG_A.
573 case BPF_RET | BPF_A:
574 case BPF_RET | BPF_K:
575 if (BPF_RVAL(fp->code) == BPF_K)
576 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0,
578 *insn = BPF_EXIT_INSN();
581 /* Store to stack. */
584 stack_off = fp->k * 4 + 4;
585 *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) ==
586 BPF_ST ? BPF_REG_A : BPF_REG_X,
588 /* check_load_and_stores() verifies that classic BPF can
589 * load from stack only after write, so tracking
590 * stack_depth for ST|STX insns is enough
592 if (new_prog && new_prog->aux->stack_depth < stack_off)
593 new_prog->aux->stack_depth = stack_off;
596 /* Load from stack. */
597 case BPF_LD | BPF_MEM:
598 case BPF_LDX | BPF_MEM:
599 stack_off = fp->k * 4 + 4;
600 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ?
601 BPF_REG_A : BPF_REG_X, BPF_REG_FP,
606 case BPF_LD | BPF_IMM:
607 case BPF_LDX | BPF_IMM:
608 *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ?
609 BPF_REG_A : BPF_REG_X, fp->k);
613 case BPF_MISC | BPF_TAX:
614 *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
618 case BPF_MISC | BPF_TXA:
619 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X);
622 /* A = skb->len or X = skb->len */
623 case BPF_LD | BPF_W | BPF_LEN:
624 case BPF_LDX | BPF_W | BPF_LEN:
625 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ?
626 BPF_REG_A : BPF_REG_X, BPF_REG_CTX,
627 offsetof(struct sk_buff, len));
630 /* Access seccomp_data fields. */
631 case BPF_LDX | BPF_ABS | BPF_W:
632 /* A = *(u32 *) (ctx + K) */
633 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k);
636 /* Unknown instruction. */
643 memcpy(new_insn, tmp_insns,
644 sizeof(*insn) * (insn - tmp_insns));
645 new_insn += insn - tmp_insns;
649 /* Only calculating new length. */
650 *new_len = new_insn - first_insn;
655 if (new_flen != new_insn - first_insn) {
656 new_flen = new_insn - first_insn;
663 BUG_ON(*new_len != new_flen);
672 * As we dont want to clear mem[] array for each packet going through
673 * __bpf_prog_run(), we check that filter loaded by user never try to read
674 * a cell if not previously written, and we check all branches to be sure
675 * a malicious user doesn't try to abuse us.
677 static int check_load_and_stores(const struct sock_filter *filter, int flen)
679 u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */
682 BUILD_BUG_ON(BPF_MEMWORDS > 16);
684 masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL);
688 memset(masks, 0xff, flen * sizeof(*masks));
690 for (pc = 0; pc < flen; pc++) {
691 memvalid &= masks[pc];
693 switch (filter[pc].code) {
696 memvalid |= (1 << filter[pc].k);
698 case BPF_LD | BPF_MEM:
699 case BPF_LDX | BPF_MEM:
700 if (!(memvalid & (1 << filter[pc].k))) {
705 case BPF_JMP | BPF_JA:
706 /* A jump must set masks on target */
707 masks[pc + 1 + filter[pc].k] &= memvalid;
710 case BPF_JMP | BPF_JEQ | BPF_K:
711 case BPF_JMP | BPF_JEQ | BPF_X:
712 case BPF_JMP | BPF_JGE | BPF_K:
713 case BPF_JMP | BPF_JGE | BPF_X:
714 case BPF_JMP | BPF_JGT | BPF_K:
715 case BPF_JMP | BPF_JGT | BPF_X:
716 case BPF_JMP | BPF_JSET | BPF_K:
717 case BPF_JMP | BPF_JSET | BPF_X:
718 /* A jump must set masks on targets */
719 masks[pc + 1 + filter[pc].jt] &= memvalid;
720 masks[pc + 1 + filter[pc].jf] &= memvalid;
730 static bool chk_code_allowed(u16 code_to_probe)
732 static const bool codes[] = {
733 /* 32 bit ALU operations */
734 [BPF_ALU | BPF_ADD | BPF_K] = true,
735 [BPF_ALU | BPF_ADD | BPF_X] = true,
736 [BPF_ALU | BPF_SUB | BPF_K] = true,
737 [BPF_ALU | BPF_SUB | BPF_X] = true,
738 [BPF_ALU | BPF_MUL | BPF_K] = true,
739 [BPF_ALU | BPF_MUL | BPF_X] = true,
740 [BPF_ALU | BPF_DIV | BPF_K] = true,
741 [BPF_ALU | BPF_DIV | BPF_X] = true,
742 [BPF_ALU | BPF_MOD | BPF_K] = true,
743 [BPF_ALU | BPF_MOD | BPF_X] = true,
744 [BPF_ALU | BPF_AND | BPF_K] = true,
745 [BPF_ALU | BPF_AND | BPF_X] = true,
746 [BPF_ALU | BPF_OR | BPF_K] = true,
747 [BPF_ALU | BPF_OR | BPF_X] = true,
748 [BPF_ALU | BPF_XOR | BPF_K] = true,
749 [BPF_ALU | BPF_XOR | BPF_X] = true,
750 [BPF_ALU | BPF_LSH | BPF_K] = true,
751 [BPF_ALU | BPF_LSH | BPF_X] = true,
752 [BPF_ALU | BPF_RSH | BPF_K] = true,
753 [BPF_ALU | BPF_RSH | BPF_X] = true,
754 [BPF_ALU | BPF_NEG] = true,
755 /* Load instructions */
756 [BPF_LD | BPF_W | BPF_ABS] = true,
757 [BPF_LD | BPF_H | BPF_ABS] = true,
758 [BPF_LD | BPF_B | BPF_ABS] = true,
759 [BPF_LD | BPF_W | BPF_LEN] = true,
760 [BPF_LD | BPF_W | BPF_IND] = true,
761 [BPF_LD | BPF_H | BPF_IND] = true,
762 [BPF_LD | BPF_B | BPF_IND] = true,
763 [BPF_LD | BPF_IMM] = true,
764 [BPF_LD | BPF_MEM] = true,
765 [BPF_LDX | BPF_W | BPF_LEN] = true,
766 [BPF_LDX | BPF_B | BPF_MSH] = true,
767 [BPF_LDX | BPF_IMM] = true,
768 [BPF_LDX | BPF_MEM] = true,
769 /* Store instructions */
772 /* Misc instructions */
773 [BPF_MISC | BPF_TAX] = true,
774 [BPF_MISC | BPF_TXA] = true,
775 /* Return instructions */
776 [BPF_RET | BPF_K] = true,
777 [BPF_RET | BPF_A] = true,
778 /* Jump instructions */
779 [BPF_JMP | BPF_JA] = true,
780 [BPF_JMP | BPF_JEQ | BPF_K] = true,
781 [BPF_JMP | BPF_JEQ | BPF_X] = true,
782 [BPF_JMP | BPF_JGE | BPF_K] = true,
783 [BPF_JMP | BPF_JGE | BPF_X] = true,
784 [BPF_JMP | BPF_JGT | BPF_K] = true,
785 [BPF_JMP | BPF_JGT | BPF_X] = true,
786 [BPF_JMP | BPF_JSET | BPF_K] = true,
787 [BPF_JMP | BPF_JSET | BPF_X] = true,
790 if (code_to_probe >= ARRAY_SIZE(codes))
793 return codes[code_to_probe];
796 static bool bpf_check_basics_ok(const struct sock_filter *filter,
801 if (flen == 0 || flen > BPF_MAXINSNS)
808 * bpf_check_classic - verify socket filter code
809 * @filter: filter to verify
810 * @flen: length of filter
812 * Check the user's filter code. If we let some ugly
813 * filter code slip through kaboom! The filter must contain
814 * no references or jumps that are out of range, no illegal
815 * instructions, and must end with a RET instruction.
817 * All jumps are forward as they are not signed.
819 * Returns 0 if the rule set is legal or -EINVAL if not.
821 static int bpf_check_classic(const struct sock_filter *filter,
827 /* Check the filter code now */
828 for (pc = 0; pc < flen; pc++) {
829 const struct sock_filter *ftest = &filter[pc];
831 /* May we actually operate on this code? */
832 if (!chk_code_allowed(ftest->code))
835 /* Some instructions need special checks */
836 switch (ftest->code) {
837 case BPF_ALU | BPF_DIV | BPF_K:
838 case BPF_ALU | BPF_MOD | BPF_K:
839 /* Check for division by zero */
843 case BPF_ALU | BPF_LSH | BPF_K:
844 case BPF_ALU | BPF_RSH | BPF_K:
848 case BPF_LD | BPF_MEM:
849 case BPF_LDX | BPF_MEM:
852 /* Check for invalid memory addresses */
853 if (ftest->k >= BPF_MEMWORDS)
856 case BPF_JMP | BPF_JA:
857 /* Note, the large ftest->k might cause loops.
858 * Compare this with conditional jumps below,
859 * where offsets are limited. --ANK (981016)
861 if (ftest->k >= (unsigned int)(flen - pc - 1))
864 case BPF_JMP | BPF_JEQ | BPF_K:
865 case BPF_JMP | BPF_JEQ | BPF_X:
866 case BPF_JMP | BPF_JGE | BPF_K:
867 case BPF_JMP | BPF_JGE | BPF_X:
868 case BPF_JMP | BPF_JGT | BPF_K:
869 case BPF_JMP | BPF_JGT | BPF_X:
870 case BPF_JMP | BPF_JSET | BPF_K:
871 case BPF_JMP | BPF_JSET | BPF_X:
872 /* Both conditionals must be safe */
873 if (pc + ftest->jt + 1 >= flen ||
874 pc + ftest->jf + 1 >= flen)
877 case BPF_LD | BPF_W | BPF_ABS:
878 case BPF_LD | BPF_H | BPF_ABS:
879 case BPF_LD | BPF_B | BPF_ABS:
881 if (bpf_anc_helper(ftest) & BPF_ANC)
883 /* Ancillary operation unknown or unsupported */
884 if (anc_found == false && ftest->k >= SKF_AD_OFF)
889 /* Last instruction must be a RET code */
890 switch (filter[flen - 1].code) {
891 case BPF_RET | BPF_K:
892 case BPF_RET | BPF_A:
893 return check_load_and_stores(filter, flen);
899 static int bpf_prog_store_orig_filter(struct bpf_prog *fp,
900 const struct sock_fprog *fprog)
902 unsigned int fsize = bpf_classic_proglen(fprog);
903 struct sock_fprog_kern *fkprog;
905 fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL);
909 fkprog = fp->orig_prog;
910 fkprog->len = fprog->len;
912 fkprog->filter = kmemdup(fp->insns, fsize,
913 GFP_KERNEL | __GFP_NOWARN);
914 if (!fkprog->filter) {
915 kfree(fp->orig_prog);
922 static void bpf_release_orig_filter(struct bpf_prog *fp)
924 struct sock_fprog_kern *fprog = fp->orig_prog;
927 kfree(fprog->filter);
932 static void __bpf_prog_release(struct bpf_prog *prog)
934 if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) {
937 bpf_release_orig_filter(prog);
942 static void __sk_filter_release(struct sk_filter *fp)
944 __bpf_prog_release(fp->prog);
949 * sk_filter_release_rcu - Release a socket filter by rcu_head
950 * @rcu: rcu_head that contains the sk_filter to free
952 static void sk_filter_release_rcu(struct rcu_head *rcu)
954 struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu);
956 __sk_filter_release(fp);
960 * sk_filter_release - release a socket filter
961 * @fp: filter to remove
963 * Remove a filter from a socket and release its resources.
965 static void sk_filter_release(struct sk_filter *fp)
967 if (refcount_dec_and_test(&fp->refcnt))
968 call_rcu(&fp->rcu, sk_filter_release_rcu);
971 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp)
973 u32 filter_size = bpf_prog_size(fp->prog->len);
975 atomic_sub(filter_size, &sk->sk_omem_alloc);
976 sk_filter_release(fp);
979 /* try to charge the socket memory if there is space available
980 * return true on success
982 static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp)
984 u32 filter_size = bpf_prog_size(fp->prog->len);
986 /* same check as in sock_kmalloc() */
987 if (filter_size <= sysctl_optmem_max &&
988 atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) {
989 atomic_add(filter_size, &sk->sk_omem_alloc);
995 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp)
997 if (!refcount_inc_not_zero(&fp->refcnt))
1000 if (!__sk_filter_charge(sk, fp)) {
1001 sk_filter_release(fp);
1007 static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp)
1009 struct sock_filter *old_prog;
1010 struct bpf_prog *old_fp;
1011 int err, new_len, old_len = fp->len;
1013 /* We are free to overwrite insns et al right here as it
1014 * won't be used at this point in time anymore internally
1015 * after the migration to the internal BPF instruction
1018 BUILD_BUG_ON(sizeof(struct sock_filter) !=
1019 sizeof(struct bpf_insn));
1021 /* Conversion cannot happen on overlapping memory areas,
1022 * so we need to keep the user BPF around until the 2nd
1023 * pass. At this time, the user BPF is stored in fp->insns.
1025 old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter),
1026 GFP_KERNEL | __GFP_NOWARN);
1032 /* 1st pass: calculate the new program length. */
1033 err = bpf_convert_filter(old_prog, old_len, NULL, &new_len);
1037 /* Expand fp for appending the new filter representation. */
1039 fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0);
1041 /* The old_fp is still around in case we couldn't
1042 * allocate new memory, so uncharge on that one.
1051 /* 2nd pass: remap sock_filter insns into bpf_insn insns. */
1052 err = bpf_convert_filter(old_prog, old_len, fp, &new_len);
1054 /* 2nd bpf_convert_filter() can fail only if it fails
1055 * to allocate memory, remapping must succeed. Note,
1056 * that at this time old_fp has already been released
1061 fp = bpf_prog_select_runtime(fp, &err);
1071 __bpf_prog_release(fp);
1072 return ERR_PTR(err);
1075 static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp,
1076 bpf_aux_classic_check_t trans)
1080 fp->bpf_func = NULL;
1083 err = bpf_check_classic(fp->insns, fp->len);
1085 __bpf_prog_release(fp);
1086 return ERR_PTR(err);
1089 /* There might be additional checks and transformations
1090 * needed on classic filters, f.e. in case of seccomp.
1093 err = trans(fp->insns, fp->len);
1095 __bpf_prog_release(fp);
1096 return ERR_PTR(err);
1100 /* Probe if we can JIT compile the filter and if so, do
1101 * the compilation of the filter.
1103 bpf_jit_compile(fp);
1105 /* JIT compiler couldn't process this filter, so do the
1106 * internal BPF translation for the optimized interpreter.
1109 fp = bpf_migrate_filter(fp);
1115 * bpf_prog_create - create an unattached filter
1116 * @pfp: the unattached filter that is created
1117 * @fprog: the filter program
1119 * Create a filter independent of any socket. We first run some
1120 * sanity checks on it to make sure it does not explode on us later.
1121 * If an error occurs or there is insufficient memory for the filter
1122 * a negative errno code is returned. On success the return is zero.
1124 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog)
1126 unsigned int fsize = bpf_classic_proglen(fprog);
1127 struct bpf_prog *fp;
1129 /* Make sure new filter is there and in the right amounts. */
1130 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1133 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1137 memcpy(fp->insns, fprog->filter, fsize);
1139 fp->len = fprog->len;
1140 /* Since unattached filters are not copied back to user
1141 * space through sk_get_filter(), we do not need to hold
1142 * a copy here, and can spare us the work.
1144 fp->orig_prog = NULL;
1146 /* bpf_prepare_filter() already takes care of freeing
1147 * memory in case something goes wrong.
1149 fp = bpf_prepare_filter(fp, NULL);
1156 EXPORT_SYMBOL_GPL(bpf_prog_create);
1159 * bpf_prog_create_from_user - create an unattached filter from user buffer
1160 * @pfp: the unattached filter that is created
1161 * @fprog: the filter program
1162 * @trans: post-classic verifier transformation handler
1163 * @save_orig: save classic BPF program
1165 * This function effectively does the same as bpf_prog_create(), only
1166 * that it builds up its insns buffer from user space provided buffer.
1167 * It also allows for passing a bpf_aux_classic_check_t handler.
1169 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
1170 bpf_aux_classic_check_t trans, bool save_orig)
1172 unsigned int fsize = bpf_classic_proglen(fprog);
1173 struct bpf_prog *fp;
1176 /* Make sure new filter is there and in the right amounts. */
1177 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1180 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1184 if (copy_from_user(fp->insns, fprog->filter, fsize)) {
1185 __bpf_prog_free(fp);
1189 fp->len = fprog->len;
1190 fp->orig_prog = NULL;
1193 err = bpf_prog_store_orig_filter(fp, fprog);
1195 __bpf_prog_free(fp);
1200 /* bpf_prepare_filter() already takes care of freeing
1201 * memory in case something goes wrong.
1203 fp = bpf_prepare_filter(fp, trans);
1210 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user);
1212 void bpf_prog_destroy(struct bpf_prog *fp)
1214 __bpf_prog_release(fp);
1216 EXPORT_SYMBOL_GPL(bpf_prog_destroy);
1218 static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk)
1220 struct sk_filter *fp, *old_fp;
1222 fp = kmalloc(sizeof(*fp), GFP_KERNEL);
1228 if (!__sk_filter_charge(sk, fp)) {
1232 refcount_set(&fp->refcnt, 1);
1234 old_fp = rcu_dereference_protected(sk->sk_filter,
1235 lockdep_sock_is_held(sk));
1236 rcu_assign_pointer(sk->sk_filter, fp);
1239 sk_filter_uncharge(sk, old_fp);
1244 static int __reuseport_attach_prog(struct bpf_prog *prog, struct sock *sk)
1246 struct bpf_prog *old_prog;
1249 if (bpf_prog_size(prog->len) > sysctl_optmem_max)
1252 if (sk_unhashed(sk) && sk->sk_reuseport) {
1253 err = reuseport_alloc(sk);
1256 } else if (!rcu_access_pointer(sk->sk_reuseport_cb)) {
1257 /* The socket wasn't bound with SO_REUSEPORT */
1261 old_prog = reuseport_attach_prog(sk, prog);
1263 bpf_prog_destroy(old_prog);
1269 struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk)
1271 unsigned int fsize = bpf_classic_proglen(fprog);
1272 struct bpf_prog *prog;
1275 if (sock_flag(sk, SOCK_FILTER_LOCKED))
1276 return ERR_PTR(-EPERM);
1278 /* Make sure new filter is there and in the right amounts. */
1279 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1280 return ERR_PTR(-EINVAL);
1282 prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1284 return ERR_PTR(-ENOMEM);
1286 if (copy_from_user(prog->insns, fprog->filter, fsize)) {
1287 __bpf_prog_free(prog);
1288 return ERR_PTR(-EFAULT);
1291 prog->len = fprog->len;
1293 err = bpf_prog_store_orig_filter(prog, fprog);
1295 __bpf_prog_free(prog);
1296 return ERR_PTR(-ENOMEM);
1299 /* bpf_prepare_filter() already takes care of freeing
1300 * memory in case something goes wrong.
1302 return bpf_prepare_filter(prog, NULL);
1306 * sk_attach_filter - attach a socket filter
1307 * @fprog: the filter program
1308 * @sk: the socket to use
1310 * Attach the user's filter code. We first run some sanity checks on
1311 * it to make sure it does not explode on us later. If an error
1312 * occurs or there is insufficient memory for the filter a negative
1313 * errno code is returned. On success the return is zero.
1315 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
1317 struct bpf_prog *prog = __get_filter(fprog, sk);
1321 return PTR_ERR(prog);
1323 err = __sk_attach_prog(prog, sk);
1325 __bpf_prog_release(prog);
1331 EXPORT_SYMBOL_GPL(sk_attach_filter);
1333 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk)
1335 struct bpf_prog *prog = __get_filter(fprog, sk);
1339 return PTR_ERR(prog);
1341 err = __reuseport_attach_prog(prog, sk);
1343 __bpf_prog_release(prog);
1350 static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk)
1352 if (sock_flag(sk, SOCK_FILTER_LOCKED))
1353 return ERR_PTR(-EPERM);
1355 return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
1358 int sk_attach_bpf(u32 ufd, struct sock *sk)
1360 struct bpf_prog *prog = __get_bpf(ufd, sk);
1364 return PTR_ERR(prog);
1366 err = __sk_attach_prog(prog, sk);
1375 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk)
1377 struct bpf_prog *prog = __get_bpf(ufd, sk);
1381 return PTR_ERR(prog);
1383 err = __reuseport_attach_prog(prog, sk);
1392 struct bpf_scratchpad {
1394 __be32 diff[MAX_BPF_STACK / sizeof(__be32)];
1395 u8 buff[MAX_BPF_STACK];
1399 static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp);
1401 static inline int __bpf_try_make_writable(struct sk_buff *skb,
1402 unsigned int write_len)
1404 return skb_ensure_writable(skb, write_len);
1407 static inline int bpf_try_make_writable(struct sk_buff *skb,
1408 unsigned int write_len)
1410 int err = __bpf_try_make_writable(skb, write_len);
1412 bpf_compute_data_pointers(skb);
1416 static int bpf_try_make_head_writable(struct sk_buff *skb)
1418 return bpf_try_make_writable(skb, skb_headlen(skb));
1421 static inline void bpf_push_mac_rcsum(struct sk_buff *skb)
1423 if (skb_at_tc_ingress(skb))
1424 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1427 static inline void bpf_pull_mac_rcsum(struct sk_buff *skb)
1429 if (skb_at_tc_ingress(skb))
1430 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1433 BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset,
1434 const void *, from, u32, len, u64, flags)
1438 if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH)))
1440 if (unlikely(offset > 0xffff))
1442 if (unlikely(bpf_try_make_writable(skb, offset + len)))
1445 ptr = skb->data + offset;
1446 if (flags & BPF_F_RECOMPUTE_CSUM)
1447 __skb_postpull_rcsum(skb, ptr, len, offset);
1449 memcpy(ptr, from, len);
1451 if (flags & BPF_F_RECOMPUTE_CSUM)
1452 __skb_postpush_rcsum(skb, ptr, len, offset);
1453 if (flags & BPF_F_INVALIDATE_HASH)
1454 skb_clear_hash(skb);
1459 static const struct bpf_func_proto bpf_skb_store_bytes_proto = {
1460 .func = bpf_skb_store_bytes,
1462 .ret_type = RET_INTEGER,
1463 .arg1_type = ARG_PTR_TO_CTX,
1464 .arg2_type = ARG_ANYTHING,
1465 .arg3_type = ARG_PTR_TO_MEM,
1466 .arg4_type = ARG_CONST_SIZE,
1467 .arg5_type = ARG_ANYTHING,
1470 BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset,
1471 void *, to, u32, len)
1475 if (unlikely(offset > 0xffff))
1478 ptr = skb_header_pointer(skb, offset, len, to);
1482 memcpy(to, ptr, len);
1490 static const struct bpf_func_proto bpf_skb_load_bytes_proto = {
1491 .func = bpf_skb_load_bytes,
1493 .ret_type = RET_INTEGER,
1494 .arg1_type = ARG_PTR_TO_CTX,
1495 .arg2_type = ARG_ANYTHING,
1496 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
1497 .arg4_type = ARG_CONST_SIZE,
1500 BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len)
1502 /* Idea is the following: should the needed direct read/write
1503 * test fail during runtime, we can pull in more data and redo
1504 * again, since implicitly, we invalidate previous checks here.
1506 * Or, since we know how much we need to make read/writeable,
1507 * this can be done once at the program beginning for direct
1508 * access case. By this we overcome limitations of only current
1509 * headroom being accessible.
1511 return bpf_try_make_writable(skb, len ? : skb_headlen(skb));
1514 static const struct bpf_func_proto bpf_skb_pull_data_proto = {
1515 .func = bpf_skb_pull_data,
1517 .ret_type = RET_INTEGER,
1518 .arg1_type = ARG_PTR_TO_CTX,
1519 .arg2_type = ARG_ANYTHING,
1522 BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset,
1523 u64, from, u64, to, u64, flags)
1527 if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK)))
1529 if (unlikely(offset > 0xffff || offset & 1))
1531 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
1534 ptr = (__sum16 *)(skb->data + offset);
1535 switch (flags & BPF_F_HDR_FIELD_MASK) {
1537 if (unlikely(from != 0))
1540 csum_replace_by_diff(ptr, to);
1543 csum_replace2(ptr, from, to);
1546 csum_replace4(ptr, from, to);
1555 static const struct bpf_func_proto bpf_l3_csum_replace_proto = {
1556 .func = bpf_l3_csum_replace,
1558 .ret_type = RET_INTEGER,
1559 .arg1_type = ARG_PTR_TO_CTX,
1560 .arg2_type = ARG_ANYTHING,
1561 .arg3_type = ARG_ANYTHING,
1562 .arg4_type = ARG_ANYTHING,
1563 .arg5_type = ARG_ANYTHING,
1566 BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset,
1567 u64, from, u64, to, u64, flags)
1569 bool is_pseudo = flags & BPF_F_PSEUDO_HDR;
1570 bool is_mmzero = flags & BPF_F_MARK_MANGLED_0;
1571 bool do_mforce = flags & BPF_F_MARK_ENFORCE;
1574 if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE |
1575 BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK)))
1577 if (unlikely(offset > 0xffff || offset & 1))
1579 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
1582 ptr = (__sum16 *)(skb->data + offset);
1583 if (is_mmzero && !do_mforce && !*ptr)
1586 switch (flags & BPF_F_HDR_FIELD_MASK) {
1588 if (unlikely(from != 0))
1591 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo);
1594 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo);
1597 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo);
1603 if (is_mmzero && !*ptr)
1604 *ptr = CSUM_MANGLED_0;
1608 static const struct bpf_func_proto bpf_l4_csum_replace_proto = {
1609 .func = bpf_l4_csum_replace,
1611 .ret_type = RET_INTEGER,
1612 .arg1_type = ARG_PTR_TO_CTX,
1613 .arg2_type = ARG_ANYTHING,
1614 .arg3_type = ARG_ANYTHING,
1615 .arg4_type = ARG_ANYTHING,
1616 .arg5_type = ARG_ANYTHING,
1619 BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size,
1620 __be32 *, to, u32, to_size, __wsum, seed)
1622 struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp);
1623 u32 diff_size = from_size + to_size;
1626 /* This is quite flexible, some examples:
1628 * from_size == 0, to_size > 0, seed := csum --> pushing data
1629 * from_size > 0, to_size == 0, seed := csum --> pulling data
1630 * from_size > 0, to_size > 0, seed := 0 --> diffing data
1632 * Even for diffing, from_size and to_size don't need to be equal.
1634 if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) ||
1635 diff_size > sizeof(sp->diff)))
1638 for (i = 0; i < from_size / sizeof(__be32); i++, j++)
1639 sp->diff[j] = ~from[i];
1640 for (i = 0; i < to_size / sizeof(__be32); i++, j++)
1641 sp->diff[j] = to[i];
1643 return csum_partial(sp->diff, diff_size, seed);
1646 static const struct bpf_func_proto bpf_csum_diff_proto = {
1647 .func = bpf_csum_diff,
1650 .ret_type = RET_INTEGER,
1651 .arg1_type = ARG_PTR_TO_MEM_OR_NULL,
1652 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
1653 .arg3_type = ARG_PTR_TO_MEM_OR_NULL,
1654 .arg4_type = ARG_CONST_SIZE_OR_ZERO,
1655 .arg5_type = ARG_ANYTHING,
1658 BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum)
1660 /* The interface is to be used in combination with bpf_csum_diff()
1661 * for direct packet writes. csum rotation for alignment as well
1662 * as emulating csum_sub() can be done from the eBPF program.
1664 if (skb->ip_summed == CHECKSUM_COMPLETE)
1665 return (skb->csum = csum_add(skb->csum, csum));
1670 static const struct bpf_func_proto bpf_csum_update_proto = {
1671 .func = bpf_csum_update,
1673 .ret_type = RET_INTEGER,
1674 .arg1_type = ARG_PTR_TO_CTX,
1675 .arg2_type = ARG_ANYTHING,
1678 static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb)
1680 return dev_forward_skb(dev, skb);
1683 static inline int __bpf_rx_skb_no_mac(struct net_device *dev,
1684 struct sk_buff *skb)
1686 int ret = ____dev_forward_skb(dev, skb);
1690 ret = netif_rx(skb);
1696 static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb)
1700 if (unlikely(__this_cpu_read(xmit_recursion) > XMIT_RECURSION_LIMIT)) {
1701 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
1708 __this_cpu_inc(xmit_recursion);
1709 ret = dev_queue_xmit(skb);
1710 __this_cpu_dec(xmit_recursion);
1715 static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev,
1718 /* skb->mac_len is not set on normal egress */
1719 unsigned int mlen = skb->network_header - skb->mac_header;
1721 __skb_pull(skb, mlen);
1723 /* At ingress, the mac header has already been pulled once.
1724 * At egress, skb_pospull_rcsum has to be done in case that
1725 * the skb is originated from ingress (i.e. a forwarded skb)
1726 * to ensure that rcsum starts at net header.
1728 if (!skb_at_tc_ingress(skb))
1729 skb_postpull_rcsum(skb, skb_mac_header(skb), mlen);
1730 skb_pop_mac_header(skb);
1731 skb_reset_mac_len(skb);
1732 return flags & BPF_F_INGRESS ?
1733 __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb);
1736 static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev,
1739 /* Verify that a link layer header is carried */
1740 if (unlikely(skb->mac_header >= skb->network_header)) {
1745 bpf_push_mac_rcsum(skb);
1746 return flags & BPF_F_INGRESS ?
1747 __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb);
1750 static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev,
1753 if (dev_is_mac_header_xmit(dev))
1754 return __bpf_redirect_common(skb, dev, flags);
1756 return __bpf_redirect_no_mac(skb, dev, flags);
1759 BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags)
1761 struct net_device *dev;
1762 struct sk_buff *clone;
1765 if (unlikely(flags & ~(BPF_F_INGRESS)))
1768 dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex);
1772 clone = skb_clone(skb, GFP_ATOMIC);
1773 if (unlikely(!clone))
1776 /* For direct write, we need to keep the invariant that the skbs
1777 * we're dealing with need to be uncloned. Should uncloning fail
1778 * here, we need to free the just generated clone to unclone once
1781 ret = bpf_try_make_head_writable(skb);
1782 if (unlikely(ret)) {
1787 return __bpf_redirect(clone, dev, flags);
1790 static const struct bpf_func_proto bpf_clone_redirect_proto = {
1791 .func = bpf_clone_redirect,
1793 .ret_type = RET_INTEGER,
1794 .arg1_type = ARG_PTR_TO_CTX,
1795 .arg2_type = ARG_ANYTHING,
1796 .arg3_type = ARG_ANYTHING,
1799 struct redirect_info {
1802 struct bpf_map *map;
1803 struct bpf_map *map_to_flush;
1804 unsigned long map_owner;
1807 static DEFINE_PER_CPU(struct redirect_info, redirect_info);
1809 BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags)
1811 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
1813 if (unlikely(flags & ~(BPF_F_INGRESS)))
1816 ri->ifindex = ifindex;
1819 return TC_ACT_REDIRECT;
1822 int skb_do_redirect(struct sk_buff *skb)
1824 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
1825 struct net_device *dev;
1827 dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->ifindex);
1829 if (unlikely(!dev)) {
1834 return __bpf_redirect(skb, dev, ri->flags);
1837 static const struct bpf_func_proto bpf_redirect_proto = {
1838 .func = bpf_redirect,
1840 .ret_type = RET_INTEGER,
1841 .arg1_type = ARG_ANYTHING,
1842 .arg2_type = ARG_ANYTHING,
1845 BPF_CALL_4(bpf_sk_redirect_map, struct sk_buff *, skb,
1846 struct bpf_map *, map, u32, key, u64, flags)
1848 struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
1850 /* If user passes invalid input drop the packet. */
1851 if (unlikely(flags))
1855 tcb->bpf.flags = flags;
1861 struct sock *do_sk_redirect_map(struct sk_buff *skb)
1863 struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
1864 struct sock *sk = NULL;
1867 sk = __sock_map_lookup_elem(tcb->bpf.map, tcb->bpf.key);
1870 tcb->bpf.map = NULL;
1876 static const struct bpf_func_proto bpf_sk_redirect_map_proto = {
1877 .func = bpf_sk_redirect_map,
1879 .ret_type = RET_INTEGER,
1880 .arg1_type = ARG_PTR_TO_CTX,
1881 .arg2_type = ARG_CONST_MAP_PTR,
1882 .arg3_type = ARG_ANYTHING,
1883 .arg4_type = ARG_ANYTHING,
1886 BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb)
1888 return task_get_classid(skb);
1891 static const struct bpf_func_proto bpf_get_cgroup_classid_proto = {
1892 .func = bpf_get_cgroup_classid,
1894 .ret_type = RET_INTEGER,
1895 .arg1_type = ARG_PTR_TO_CTX,
1898 BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb)
1900 return dst_tclassid(skb);
1903 static const struct bpf_func_proto bpf_get_route_realm_proto = {
1904 .func = bpf_get_route_realm,
1906 .ret_type = RET_INTEGER,
1907 .arg1_type = ARG_PTR_TO_CTX,
1910 BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb)
1912 /* If skb_clear_hash() was called due to mangling, we can
1913 * trigger SW recalculation here. Later access to hash
1914 * can then use the inline skb->hash via context directly
1915 * instead of calling this helper again.
1917 return skb_get_hash(skb);
1920 static const struct bpf_func_proto bpf_get_hash_recalc_proto = {
1921 .func = bpf_get_hash_recalc,
1923 .ret_type = RET_INTEGER,
1924 .arg1_type = ARG_PTR_TO_CTX,
1927 BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb)
1929 /* After all direct packet write, this can be used once for
1930 * triggering a lazy recalc on next skb_get_hash() invocation.
1932 skb_clear_hash(skb);
1936 static const struct bpf_func_proto bpf_set_hash_invalid_proto = {
1937 .func = bpf_set_hash_invalid,
1939 .ret_type = RET_INTEGER,
1940 .arg1_type = ARG_PTR_TO_CTX,
1943 BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash)
1945 /* Set user specified hash as L4(+), so that it gets returned
1946 * on skb_get_hash() call unless BPF prog later on triggers a
1949 __skb_set_sw_hash(skb, hash, true);
1953 static const struct bpf_func_proto bpf_set_hash_proto = {
1954 .func = bpf_set_hash,
1956 .ret_type = RET_INTEGER,
1957 .arg1_type = ARG_PTR_TO_CTX,
1958 .arg2_type = ARG_ANYTHING,
1961 BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto,
1966 if (unlikely(vlan_proto != htons(ETH_P_8021Q) &&
1967 vlan_proto != htons(ETH_P_8021AD)))
1968 vlan_proto = htons(ETH_P_8021Q);
1970 bpf_push_mac_rcsum(skb);
1971 ret = skb_vlan_push(skb, vlan_proto, vlan_tci);
1972 bpf_pull_mac_rcsum(skb);
1974 bpf_compute_data_pointers(skb);
1978 const struct bpf_func_proto bpf_skb_vlan_push_proto = {
1979 .func = bpf_skb_vlan_push,
1981 .ret_type = RET_INTEGER,
1982 .arg1_type = ARG_PTR_TO_CTX,
1983 .arg2_type = ARG_ANYTHING,
1984 .arg3_type = ARG_ANYTHING,
1986 EXPORT_SYMBOL_GPL(bpf_skb_vlan_push_proto);
1988 BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb)
1992 bpf_push_mac_rcsum(skb);
1993 ret = skb_vlan_pop(skb);
1994 bpf_pull_mac_rcsum(skb);
1996 bpf_compute_data_pointers(skb);
2000 const struct bpf_func_proto bpf_skb_vlan_pop_proto = {
2001 .func = bpf_skb_vlan_pop,
2003 .ret_type = RET_INTEGER,
2004 .arg1_type = ARG_PTR_TO_CTX,
2006 EXPORT_SYMBOL_GPL(bpf_skb_vlan_pop_proto);
2008 static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len)
2010 /* Caller already did skb_cow() with len as headroom,
2011 * so no need to do it here.
2014 memmove(skb->data, skb->data + len, off);
2015 memset(skb->data + off, 0, len);
2017 /* No skb_postpush_rcsum(skb, skb->data + off, len)
2018 * needed here as it does not change the skb->csum
2019 * result for checksum complete when summing over
2025 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len)
2027 /* skb_ensure_writable() is not needed here, as we're
2028 * already working on an uncloned skb.
2030 if (unlikely(!pskb_may_pull(skb, off + len)))
2033 skb_postpull_rcsum(skb, skb->data + off, len);
2034 memmove(skb->data + len, skb->data, off);
2035 __skb_pull(skb, len);
2040 static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len)
2042 bool trans_same = skb->transport_header == skb->network_header;
2045 /* There's no need for __skb_push()/__skb_pull() pair to
2046 * get to the start of the mac header as we're guaranteed
2047 * to always start from here under eBPF.
2049 ret = bpf_skb_generic_push(skb, off, len);
2051 skb->mac_header -= len;
2052 skb->network_header -= len;
2054 skb->transport_header = skb->network_header;
2060 static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len)
2062 bool trans_same = skb->transport_header == skb->network_header;
2065 /* Same here, __skb_push()/__skb_pull() pair not needed. */
2066 ret = bpf_skb_generic_pop(skb, off, len);
2068 skb->mac_header += len;
2069 skb->network_header += len;
2071 skb->transport_header = skb->network_header;
2077 static int bpf_skb_proto_4_to_6(struct sk_buff *skb)
2079 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
2080 u32 off = skb_mac_header_len(skb);
2083 ret = skb_cow(skb, len_diff);
2084 if (unlikely(ret < 0))
2087 ret = bpf_skb_net_hdr_push(skb, off, len_diff);
2088 if (unlikely(ret < 0))
2091 if (skb_is_gso(skb)) {
2092 /* SKB_GSO_TCPV4 needs to be changed into
2095 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
2096 skb_shinfo(skb)->gso_type &= ~SKB_GSO_TCPV4;
2097 skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6;
2100 /* Due to IPv6 header, MSS needs to be downgraded. */
2101 skb_shinfo(skb)->gso_size -= len_diff;
2102 /* Header must be checked, and gso_segs recomputed. */
2103 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2104 skb_shinfo(skb)->gso_segs = 0;
2107 skb->protocol = htons(ETH_P_IPV6);
2108 skb_clear_hash(skb);
2113 static int bpf_skb_proto_6_to_4(struct sk_buff *skb)
2115 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
2116 u32 off = skb_mac_header_len(skb);
2119 ret = skb_unclone(skb, GFP_ATOMIC);
2120 if (unlikely(ret < 0))
2123 ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
2124 if (unlikely(ret < 0))
2127 if (skb_is_gso(skb)) {
2128 /* SKB_GSO_TCPV6 needs to be changed into
2131 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) {
2132 skb_shinfo(skb)->gso_type &= ~SKB_GSO_TCPV6;
2133 skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4;
2136 /* Due to IPv4 header, MSS can be upgraded. */
2137 skb_shinfo(skb)->gso_size += len_diff;
2138 /* Header must be checked, and gso_segs recomputed. */
2139 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2140 skb_shinfo(skb)->gso_segs = 0;
2143 skb->protocol = htons(ETH_P_IP);
2144 skb_clear_hash(skb);
2149 static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto)
2151 __be16 from_proto = skb->protocol;
2153 if (from_proto == htons(ETH_P_IP) &&
2154 to_proto == htons(ETH_P_IPV6))
2155 return bpf_skb_proto_4_to_6(skb);
2157 if (from_proto == htons(ETH_P_IPV6) &&
2158 to_proto == htons(ETH_P_IP))
2159 return bpf_skb_proto_6_to_4(skb);
2164 BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto,
2169 if (unlikely(flags))
2172 /* General idea is that this helper does the basic groundwork
2173 * needed for changing the protocol, and eBPF program fills the
2174 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace()
2175 * and other helpers, rather than passing a raw buffer here.
2177 * The rationale is to keep this minimal and without a need to
2178 * deal with raw packet data. F.e. even if we would pass buffers
2179 * here, the program still needs to call the bpf_lX_csum_replace()
2180 * helpers anyway. Plus, this way we keep also separation of
2181 * concerns, since f.e. bpf_skb_store_bytes() should only take
2184 * Currently, additional options and extension header space are
2185 * not supported, but flags register is reserved so we can adapt
2186 * that. For offloads, we mark packet as dodgy, so that headers
2187 * need to be verified first.
2189 ret = bpf_skb_proto_xlat(skb, proto);
2190 bpf_compute_data_pointers(skb);
2194 static const struct bpf_func_proto bpf_skb_change_proto_proto = {
2195 .func = bpf_skb_change_proto,
2197 .ret_type = RET_INTEGER,
2198 .arg1_type = ARG_PTR_TO_CTX,
2199 .arg2_type = ARG_ANYTHING,
2200 .arg3_type = ARG_ANYTHING,
2203 BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type)
2205 /* We only allow a restricted subset to be changed for now. */
2206 if (unlikely(!skb_pkt_type_ok(skb->pkt_type) ||
2207 !skb_pkt_type_ok(pkt_type)))
2210 skb->pkt_type = pkt_type;
2214 static const struct bpf_func_proto bpf_skb_change_type_proto = {
2215 .func = bpf_skb_change_type,
2217 .ret_type = RET_INTEGER,
2218 .arg1_type = ARG_PTR_TO_CTX,
2219 .arg2_type = ARG_ANYTHING,
2222 static u32 bpf_skb_net_base_len(const struct sk_buff *skb)
2224 switch (skb->protocol) {
2225 case htons(ETH_P_IP):
2226 return sizeof(struct iphdr);
2227 case htons(ETH_P_IPV6):
2228 return sizeof(struct ipv6hdr);
2234 static int bpf_skb_net_grow(struct sk_buff *skb, u32 len_diff)
2236 u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb);
2239 ret = skb_cow(skb, len_diff);
2240 if (unlikely(ret < 0))
2243 ret = bpf_skb_net_hdr_push(skb, off, len_diff);
2244 if (unlikely(ret < 0))
2247 if (skb_is_gso(skb)) {
2248 /* Due to header grow, MSS needs to be downgraded. */
2249 skb_shinfo(skb)->gso_size -= len_diff;
2250 /* Header must be checked, and gso_segs recomputed. */
2251 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2252 skb_shinfo(skb)->gso_segs = 0;
2258 static int bpf_skb_net_shrink(struct sk_buff *skb, u32 len_diff)
2260 u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb);
2263 ret = skb_unclone(skb, GFP_ATOMIC);
2264 if (unlikely(ret < 0))
2267 ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
2268 if (unlikely(ret < 0))
2271 if (skb_is_gso(skb)) {
2272 /* Due to header shrink, MSS can be upgraded. */
2273 skb_shinfo(skb)->gso_size += len_diff;
2274 /* Header must be checked, and gso_segs recomputed. */
2275 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2276 skb_shinfo(skb)->gso_segs = 0;
2282 static u32 __bpf_skb_max_len(const struct sk_buff *skb)
2284 return skb->dev->mtu + skb->dev->hard_header_len;
2287 static int bpf_skb_adjust_net(struct sk_buff *skb, s32 len_diff)
2289 bool trans_same = skb->transport_header == skb->network_header;
2290 u32 len_cur, len_diff_abs = abs(len_diff);
2291 u32 len_min = bpf_skb_net_base_len(skb);
2292 u32 len_max = __bpf_skb_max_len(skb);
2293 __be16 proto = skb->protocol;
2294 bool shrink = len_diff < 0;
2297 if (unlikely(len_diff_abs > 0xfffU))
2299 if (unlikely(proto != htons(ETH_P_IP) &&
2300 proto != htons(ETH_P_IPV6)))
2303 len_cur = skb->len - skb_network_offset(skb);
2304 if (skb_transport_header_was_set(skb) && !trans_same)
2305 len_cur = skb_network_header_len(skb);
2306 if ((shrink && (len_diff_abs >= len_cur ||
2307 len_cur - len_diff_abs < len_min)) ||
2308 (!shrink && (skb->len + len_diff_abs > len_max &&
2312 ret = shrink ? bpf_skb_net_shrink(skb, len_diff_abs) :
2313 bpf_skb_net_grow(skb, len_diff_abs);
2315 bpf_compute_data_pointers(skb);
2319 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff,
2320 u32, mode, u64, flags)
2322 if (unlikely(flags))
2324 if (likely(mode == BPF_ADJ_ROOM_NET))
2325 return bpf_skb_adjust_net(skb, len_diff);
2330 static const struct bpf_func_proto bpf_skb_adjust_room_proto = {
2331 .func = bpf_skb_adjust_room,
2333 .ret_type = RET_INTEGER,
2334 .arg1_type = ARG_PTR_TO_CTX,
2335 .arg2_type = ARG_ANYTHING,
2336 .arg3_type = ARG_ANYTHING,
2337 .arg4_type = ARG_ANYTHING,
2340 static u32 __bpf_skb_min_len(const struct sk_buff *skb)
2342 u32 min_len = skb_network_offset(skb);
2344 if (skb_transport_header_was_set(skb))
2345 min_len = skb_transport_offset(skb);
2346 if (skb->ip_summed == CHECKSUM_PARTIAL)
2347 min_len = skb_checksum_start_offset(skb) +
2348 skb->csum_offset + sizeof(__sum16);
2352 static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len)
2354 unsigned int old_len = skb->len;
2357 ret = __skb_grow_rcsum(skb, new_len);
2359 memset(skb->data + old_len, 0, new_len - old_len);
2363 static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len)
2365 return __skb_trim_rcsum(skb, new_len);
2368 BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len,
2371 u32 max_len = __bpf_skb_max_len(skb);
2372 u32 min_len = __bpf_skb_min_len(skb);
2375 if (unlikely(flags || new_len > max_len || new_len < min_len))
2377 if (skb->encapsulation)
2380 /* The basic idea of this helper is that it's performing the
2381 * needed work to either grow or trim an skb, and eBPF program
2382 * rewrites the rest via helpers like bpf_skb_store_bytes(),
2383 * bpf_lX_csum_replace() and others rather than passing a raw
2384 * buffer here. This one is a slow path helper and intended
2385 * for replies with control messages.
2387 * Like in bpf_skb_change_proto(), we want to keep this rather
2388 * minimal and without protocol specifics so that we are able
2389 * to separate concerns as in bpf_skb_store_bytes() should only
2390 * be the one responsible for writing buffers.
2392 * It's really expected to be a slow path operation here for
2393 * control message replies, so we're implicitly linearizing,
2394 * uncloning and drop offloads from the skb by this.
2396 ret = __bpf_try_make_writable(skb, skb->len);
2398 if (new_len > skb->len)
2399 ret = bpf_skb_grow_rcsum(skb, new_len);
2400 else if (new_len < skb->len)
2401 ret = bpf_skb_trim_rcsum(skb, new_len);
2402 if (!ret && skb_is_gso(skb))
2406 bpf_compute_data_pointers(skb);
2410 static const struct bpf_func_proto bpf_skb_change_tail_proto = {
2411 .func = bpf_skb_change_tail,
2413 .ret_type = RET_INTEGER,
2414 .arg1_type = ARG_PTR_TO_CTX,
2415 .arg2_type = ARG_ANYTHING,
2416 .arg3_type = ARG_ANYTHING,
2419 BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room,
2422 u32 max_len = __bpf_skb_max_len(skb);
2423 u32 new_len = skb->len + head_room;
2426 if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) ||
2427 new_len < skb->len))
2430 ret = skb_cow(skb, head_room);
2432 /* Idea for this helper is that we currently only
2433 * allow to expand on mac header. This means that
2434 * skb->protocol network header, etc, stay as is.
2435 * Compared to bpf_skb_change_tail(), we're more
2436 * flexible due to not needing to linearize or
2437 * reset GSO. Intention for this helper is to be
2438 * used by an L3 skb that needs to push mac header
2439 * for redirection into L2 device.
2441 __skb_push(skb, head_room);
2442 memset(skb->data, 0, head_room);
2443 skb_reset_mac_header(skb);
2446 bpf_compute_data_pointers(skb);
2450 static const struct bpf_func_proto bpf_skb_change_head_proto = {
2451 .func = bpf_skb_change_head,
2453 .ret_type = RET_INTEGER,
2454 .arg1_type = ARG_PTR_TO_CTX,
2455 .arg2_type = ARG_ANYTHING,
2456 .arg3_type = ARG_ANYTHING,
2459 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp)
2461 return xdp_data_meta_unsupported(xdp) ? 0 :
2462 xdp->data - xdp->data_meta;
2465 BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset)
2467 unsigned long metalen = xdp_get_metalen(xdp);
2468 void *data_start = xdp->data_hard_start + metalen;
2469 void *data = xdp->data + offset;
2471 if (unlikely(data < data_start ||
2472 data > xdp->data_end - ETH_HLEN))
2476 memmove(xdp->data_meta + offset,
2477 xdp->data_meta, metalen);
2478 xdp->data_meta += offset;
2484 static const struct bpf_func_proto bpf_xdp_adjust_head_proto = {
2485 .func = bpf_xdp_adjust_head,
2487 .ret_type = RET_INTEGER,
2488 .arg1_type = ARG_PTR_TO_CTX,
2489 .arg2_type = ARG_ANYTHING,
2492 BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset)
2494 void *meta = xdp->data_meta + offset;
2495 unsigned long metalen = xdp->data - meta;
2497 if (xdp_data_meta_unsupported(xdp))
2499 if (unlikely(meta < xdp->data_hard_start ||
2502 if (unlikely((metalen & (sizeof(__u32) - 1)) ||
2506 xdp->data_meta = meta;
2511 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = {
2512 .func = bpf_xdp_adjust_meta,
2514 .ret_type = RET_INTEGER,
2515 .arg1_type = ARG_PTR_TO_CTX,
2516 .arg2_type = ARG_ANYTHING,
2519 static int __bpf_tx_xdp(struct net_device *dev,
2520 struct bpf_map *map,
2521 struct xdp_buff *xdp,
2526 if (!dev->netdev_ops->ndo_xdp_xmit) {
2530 err = dev->netdev_ops->ndo_xdp_xmit(dev, xdp);
2533 dev->netdev_ops->ndo_xdp_flush(dev);
2537 static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd,
2538 struct bpf_map *map,
2539 struct xdp_buff *xdp,
2544 if (map->map_type == BPF_MAP_TYPE_DEVMAP) {
2545 struct net_device *dev = fwd;
2547 if (!dev->netdev_ops->ndo_xdp_xmit)
2550 err = dev->netdev_ops->ndo_xdp_xmit(dev, xdp);
2553 __dev_map_insert_ctx(map, index);
2555 } else if (map->map_type == BPF_MAP_TYPE_CPUMAP) {
2556 struct bpf_cpu_map_entry *rcpu = fwd;
2558 err = cpu_map_enqueue(rcpu, xdp, dev_rx);
2561 __cpu_map_insert_ctx(map, index);
2566 void xdp_do_flush_map(void)
2568 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2569 struct bpf_map *map = ri->map_to_flush;
2571 ri->map_to_flush = NULL;
2573 switch (map->map_type) {
2574 case BPF_MAP_TYPE_DEVMAP:
2575 __dev_map_flush(map);
2577 case BPF_MAP_TYPE_CPUMAP:
2578 __cpu_map_flush(map);
2585 EXPORT_SYMBOL_GPL(xdp_do_flush_map);
2587 static void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index)
2589 switch (map->map_type) {
2590 case BPF_MAP_TYPE_DEVMAP:
2591 return __dev_map_lookup_elem(map, index);
2592 case BPF_MAP_TYPE_CPUMAP:
2593 return __cpu_map_lookup_elem(map, index);
2599 static inline bool xdp_map_invalid(const struct bpf_prog *xdp_prog,
2602 return (unsigned long)xdp_prog->aux != aux;
2605 static int xdp_do_redirect_map(struct net_device *dev, struct xdp_buff *xdp,
2606 struct bpf_prog *xdp_prog)
2608 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2609 unsigned long map_owner = ri->map_owner;
2610 struct bpf_map *map = ri->map;
2611 u32 index = ri->ifindex;
2619 if (unlikely(xdp_map_invalid(xdp_prog, map_owner))) {
2625 fwd = __xdp_map_lookup_elem(map, index);
2630 if (ri->map_to_flush && ri->map_to_flush != map)
2633 err = __bpf_tx_xdp_map(dev, fwd, map, xdp, index);
2637 ri->map_to_flush = map;
2638 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
2641 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
2645 int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
2646 struct bpf_prog *xdp_prog)
2648 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2649 struct net_device *fwd;
2650 u32 index = ri->ifindex;
2654 return xdp_do_redirect_map(dev, xdp, xdp_prog);
2656 fwd = dev_get_by_index_rcu(dev_net(dev), index);
2658 if (unlikely(!fwd)) {
2663 err = __bpf_tx_xdp(fwd, NULL, xdp, 0);
2667 _trace_xdp_redirect(dev, xdp_prog, index);
2670 _trace_xdp_redirect_err(dev, xdp_prog, index, err);
2673 EXPORT_SYMBOL_GPL(xdp_do_redirect);
2675 static int __xdp_generic_ok_fwd_dev(struct sk_buff *skb, struct net_device *fwd)
2679 if (unlikely(!(fwd->flags & IFF_UP)))
2682 len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN;
2689 static int xdp_do_generic_redirect_map(struct net_device *dev,
2690 struct sk_buff *skb,
2691 struct bpf_prog *xdp_prog)
2693 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2694 unsigned long map_owner = ri->map_owner;
2695 struct bpf_map *map = ri->map;
2696 struct net_device *fwd = NULL;
2697 u32 index = ri->ifindex;
2704 if (unlikely(xdp_map_invalid(xdp_prog, map_owner))) {
2709 fwd = __xdp_map_lookup_elem(map, index);
2710 if (unlikely(!fwd)) {
2715 if (map->map_type == BPF_MAP_TYPE_DEVMAP) {
2716 if (unlikely((err = __xdp_generic_ok_fwd_dev(skb, fwd))))
2720 /* TODO: Handle BPF_MAP_TYPE_CPUMAP */
2725 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
2728 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
2732 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
2733 struct bpf_prog *xdp_prog)
2735 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2736 u32 index = ri->ifindex;
2737 struct net_device *fwd;
2741 return xdp_do_generic_redirect_map(dev, skb, xdp_prog);
2744 fwd = dev_get_by_index_rcu(dev_net(dev), index);
2745 if (unlikely(!fwd)) {
2750 if (unlikely((err = __xdp_generic_ok_fwd_dev(skb, fwd))))
2754 _trace_xdp_redirect(dev, xdp_prog, index);
2757 _trace_xdp_redirect_err(dev, xdp_prog, index, err);
2760 EXPORT_SYMBOL_GPL(xdp_do_generic_redirect);
2762 BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags)
2764 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2766 if (unlikely(flags))
2769 ri->ifindex = ifindex;
2774 return XDP_REDIRECT;
2777 static const struct bpf_func_proto bpf_xdp_redirect_proto = {
2778 .func = bpf_xdp_redirect,
2780 .ret_type = RET_INTEGER,
2781 .arg1_type = ARG_ANYTHING,
2782 .arg2_type = ARG_ANYTHING,
2785 BPF_CALL_4(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex, u64, flags,
2786 unsigned long, map_owner)
2788 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2790 if (unlikely(flags))
2793 ri->ifindex = ifindex;
2796 ri->map_owner = map_owner;
2798 return XDP_REDIRECT;
2801 /* Note, arg4 is hidden from users and populated by the verifier
2802 * with the right pointer.
2804 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = {
2805 .func = bpf_xdp_redirect_map,
2807 .ret_type = RET_INTEGER,
2808 .arg1_type = ARG_CONST_MAP_PTR,
2809 .arg2_type = ARG_ANYTHING,
2810 .arg3_type = ARG_ANYTHING,
2813 bool bpf_helper_changes_pkt_data(void *func)
2815 if (func == bpf_skb_vlan_push ||
2816 func == bpf_skb_vlan_pop ||
2817 func == bpf_skb_store_bytes ||
2818 func == bpf_skb_change_proto ||
2819 func == bpf_skb_change_head ||
2820 func == bpf_skb_change_tail ||
2821 func == bpf_skb_adjust_room ||
2822 func == bpf_skb_pull_data ||
2823 func == bpf_clone_redirect ||
2824 func == bpf_l3_csum_replace ||
2825 func == bpf_l4_csum_replace ||
2826 func == bpf_xdp_adjust_head ||
2827 func == bpf_xdp_adjust_meta)
2833 static unsigned long bpf_skb_copy(void *dst_buff, const void *skb,
2834 unsigned long off, unsigned long len)
2836 void *ptr = skb_header_pointer(skb, off, len, dst_buff);
2840 if (ptr != dst_buff)
2841 memcpy(dst_buff, ptr, len);
2846 BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map,
2847 u64, flags, void *, meta, u64, meta_size)
2849 u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
2851 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
2853 if (unlikely(skb_size > skb->len))
2856 return bpf_event_output(map, flags, meta, meta_size, skb, skb_size,
2860 static const struct bpf_func_proto bpf_skb_event_output_proto = {
2861 .func = bpf_skb_event_output,
2863 .ret_type = RET_INTEGER,
2864 .arg1_type = ARG_PTR_TO_CTX,
2865 .arg2_type = ARG_CONST_MAP_PTR,
2866 .arg3_type = ARG_ANYTHING,
2867 .arg4_type = ARG_PTR_TO_MEM,
2868 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
2871 static unsigned short bpf_tunnel_key_af(u64 flags)
2873 return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET;
2876 BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to,
2877 u32, size, u64, flags)
2879 const struct ip_tunnel_info *info = skb_tunnel_info(skb);
2880 u8 compat[sizeof(struct bpf_tunnel_key)];
2884 if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) {
2888 if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) {
2892 if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
2895 case offsetof(struct bpf_tunnel_key, tunnel_label):
2896 case offsetof(struct bpf_tunnel_key, tunnel_ext):
2898 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
2899 /* Fixup deprecated structure layouts here, so we have
2900 * a common path later on.
2902 if (ip_tunnel_info_af(info) != AF_INET)
2905 to = (struct bpf_tunnel_key *)compat;
2912 to->tunnel_id = be64_to_cpu(info->key.tun_id);
2913 to->tunnel_tos = info->key.tos;
2914 to->tunnel_ttl = info->key.ttl;
2916 if (flags & BPF_F_TUNINFO_IPV6) {
2917 memcpy(to->remote_ipv6, &info->key.u.ipv6.src,
2918 sizeof(to->remote_ipv6));
2919 to->tunnel_label = be32_to_cpu(info->key.label);
2921 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src);
2924 if (unlikely(size != sizeof(struct bpf_tunnel_key)))
2925 memcpy(to_orig, to, size);
2929 memset(to_orig, 0, size);
2933 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = {
2934 .func = bpf_skb_get_tunnel_key,
2936 .ret_type = RET_INTEGER,
2937 .arg1_type = ARG_PTR_TO_CTX,
2938 .arg2_type = ARG_PTR_TO_UNINIT_MEM,
2939 .arg3_type = ARG_CONST_SIZE,
2940 .arg4_type = ARG_ANYTHING,
2943 BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size)
2945 const struct ip_tunnel_info *info = skb_tunnel_info(skb);
2948 if (unlikely(!info ||
2949 !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) {
2953 if (unlikely(size < info->options_len)) {
2958 ip_tunnel_info_opts_get(to, info);
2959 if (size > info->options_len)
2960 memset(to + info->options_len, 0, size - info->options_len);
2962 return info->options_len;
2964 memset(to, 0, size);
2968 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = {
2969 .func = bpf_skb_get_tunnel_opt,
2971 .ret_type = RET_INTEGER,
2972 .arg1_type = ARG_PTR_TO_CTX,
2973 .arg2_type = ARG_PTR_TO_UNINIT_MEM,
2974 .arg3_type = ARG_CONST_SIZE,
2977 static struct metadata_dst __percpu *md_dst;
2979 BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb,
2980 const struct bpf_tunnel_key *, from, u32, size, u64, flags)
2982 struct metadata_dst *md = this_cpu_ptr(md_dst);
2983 u8 compat[sizeof(struct bpf_tunnel_key)];
2984 struct ip_tunnel_info *info;
2986 if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX |
2987 BPF_F_DONT_FRAGMENT)))
2989 if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
2991 case offsetof(struct bpf_tunnel_key, tunnel_label):
2992 case offsetof(struct bpf_tunnel_key, tunnel_ext):
2993 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
2994 /* Fixup deprecated structure layouts here, so we have
2995 * a common path later on.
2997 memcpy(compat, from, size);
2998 memset(compat + size, 0, sizeof(compat) - size);
2999 from = (const struct bpf_tunnel_key *) compat;
3005 if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) ||
3010 dst_hold((struct dst_entry *) md);
3011 skb_dst_set(skb, (struct dst_entry *) md);
3013 info = &md->u.tun_info;
3014 info->mode = IP_TUNNEL_INFO_TX;
3016 info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
3017 if (flags & BPF_F_DONT_FRAGMENT)
3018 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT;
3019 if (flags & BPF_F_ZERO_CSUM_TX)
3020 info->key.tun_flags &= ~TUNNEL_CSUM;
3022 info->key.tun_id = cpu_to_be64(from->tunnel_id);
3023 info->key.tos = from->tunnel_tos;
3024 info->key.ttl = from->tunnel_ttl;
3026 if (flags & BPF_F_TUNINFO_IPV6) {
3027 info->mode |= IP_TUNNEL_INFO_IPV6;
3028 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6,
3029 sizeof(from->remote_ipv6));
3030 info->key.label = cpu_to_be32(from->tunnel_label) &
3031 IPV6_FLOWLABEL_MASK;
3033 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4);
3039 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = {
3040 .func = bpf_skb_set_tunnel_key,
3042 .ret_type = RET_INTEGER,
3043 .arg1_type = ARG_PTR_TO_CTX,
3044 .arg2_type = ARG_PTR_TO_MEM,
3045 .arg3_type = ARG_CONST_SIZE,
3046 .arg4_type = ARG_ANYTHING,
3049 BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb,
3050 const u8 *, from, u32, size)
3052 struct ip_tunnel_info *info = skb_tunnel_info(skb);
3053 const struct metadata_dst *md = this_cpu_ptr(md_dst);
3055 if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1))))
3057 if (unlikely(size > IP_TUNNEL_OPTS_MAX))
3060 ip_tunnel_info_opts_set(info, from, size);
3065 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = {
3066 .func = bpf_skb_set_tunnel_opt,
3068 .ret_type = RET_INTEGER,
3069 .arg1_type = ARG_PTR_TO_CTX,
3070 .arg2_type = ARG_PTR_TO_MEM,
3071 .arg3_type = ARG_CONST_SIZE,
3074 static const struct bpf_func_proto *
3075 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which)
3078 struct metadata_dst __percpu *tmp;
3080 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX,
3085 if (cmpxchg(&md_dst, NULL, tmp))
3086 metadata_dst_free_percpu(tmp);
3090 case BPF_FUNC_skb_set_tunnel_key:
3091 return &bpf_skb_set_tunnel_key_proto;
3092 case BPF_FUNC_skb_set_tunnel_opt:
3093 return &bpf_skb_set_tunnel_opt_proto;
3099 BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map,
3102 struct bpf_array *array = container_of(map, struct bpf_array, map);
3103 struct cgroup *cgrp;
3106 sk = skb_to_full_sk(skb);
3107 if (!sk || !sk_fullsock(sk))
3109 if (unlikely(idx >= array->map.max_entries))
3112 cgrp = READ_ONCE(array->ptrs[idx]);
3113 if (unlikely(!cgrp))
3116 return sk_under_cgroup_hierarchy(sk, cgrp);
3119 static const struct bpf_func_proto bpf_skb_under_cgroup_proto = {
3120 .func = bpf_skb_under_cgroup,
3122 .ret_type = RET_INTEGER,
3123 .arg1_type = ARG_PTR_TO_CTX,
3124 .arg2_type = ARG_CONST_MAP_PTR,
3125 .arg3_type = ARG_ANYTHING,
3128 static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff,
3129 unsigned long off, unsigned long len)
3131 memcpy(dst_buff, src_buff + off, len);
3135 BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map,
3136 u64, flags, void *, meta, u64, meta_size)
3138 u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
3140 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
3142 if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data)))
3145 return bpf_event_output(map, flags, meta, meta_size, xdp->data,
3146 xdp_size, bpf_xdp_copy);
3149 static const struct bpf_func_proto bpf_xdp_event_output_proto = {
3150 .func = bpf_xdp_event_output,
3152 .ret_type = RET_INTEGER,
3153 .arg1_type = ARG_PTR_TO_CTX,
3154 .arg2_type = ARG_CONST_MAP_PTR,
3155 .arg3_type = ARG_ANYTHING,
3156 .arg4_type = ARG_PTR_TO_MEM,
3157 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
3160 BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb)
3162 return skb->sk ? sock_gen_cookie(skb->sk) : 0;
3165 static const struct bpf_func_proto bpf_get_socket_cookie_proto = {
3166 .func = bpf_get_socket_cookie,
3168 .ret_type = RET_INTEGER,
3169 .arg1_type = ARG_PTR_TO_CTX,
3172 BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb)
3174 struct sock *sk = sk_to_full_sk(skb->sk);
3177 if (!sk || !sk_fullsock(sk))
3179 kuid = sock_net_uid(sock_net(sk), sk);
3180 return from_kuid_munged(sock_net(sk)->user_ns, kuid);
3183 static const struct bpf_func_proto bpf_get_socket_uid_proto = {
3184 .func = bpf_get_socket_uid,
3186 .ret_type = RET_INTEGER,
3187 .arg1_type = ARG_PTR_TO_CTX,
3190 BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
3191 int, level, int, optname, char *, optval, int, optlen)
3193 struct sock *sk = bpf_sock->sk;
3197 if (!sk_fullsock(sk))
3200 if (level == SOL_SOCKET) {
3201 if (optlen != sizeof(int))
3203 val = *((int *)optval);
3205 /* Only some socketops are supported */
3208 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
3209 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
3212 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
3213 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
3215 case SO_MAX_PACING_RATE:
3216 sk->sk_max_pacing_rate = val;
3217 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
3218 sk->sk_max_pacing_rate);
3221 sk->sk_priority = val;
3226 sk->sk_rcvlowat = val ? : 1;
3235 } else if (level == SOL_TCP &&
3236 sk->sk_prot->setsockopt == tcp_setsockopt) {
3237 if (optname == TCP_CONGESTION) {
3238 char name[TCP_CA_NAME_MAX];
3239 bool reinit = bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN;
3241 strncpy(name, optval, min_t(long, optlen,
3242 TCP_CA_NAME_MAX-1));
3243 name[TCP_CA_NAME_MAX-1] = 0;
3244 ret = tcp_set_congestion_control(sk, name, false, reinit);
3246 struct tcp_sock *tp = tcp_sk(sk);
3248 if (optlen != sizeof(int))
3251 val = *((int *)optval);
3252 /* Only some options are supported */
3255 if (val <= 0 || tp->data_segs_out > 0)
3260 case TCP_BPF_SNDCWND_CLAMP:
3264 tp->snd_cwnd_clamp = val;
3265 tp->snd_ssthresh = val;
3279 static const struct bpf_func_proto bpf_setsockopt_proto = {
3280 .func = bpf_setsockopt,
3282 .ret_type = RET_INTEGER,
3283 .arg1_type = ARG_PTR_TO_CTX,
3284 .arg2_type = ARG_ANYTHING,
3285 .arg3_type = ARG_ANYTHING,
3286 .arg4_type = ARG_PTR_TO_MEM,
3287 .arg5_type = ARG_CONST_SIZE,
3290 BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
3291 int, level, int, optname, char *, optval, int, optlen)
3293 struct sock *sk = bpf_sock->sk;
3295 if (!sk_fullsock(sk))
3299 if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) {
3300 if (optname == TCP_CONGESTION) {
3301 struct inet_connection_sock *icsk = inet_csk(sk);
3303 if (!icsk->icsk_ca_ops || optlen <= 1)
3305 strncpy(optval, icsk->icsk_ca_ops->name, optlen);
3306 optval[optlen - 1] = 0;
3316 memset(optval, 0, optlen);
3320 static const struct bpf_func_proto bpf_getsockopt_proto = {
3321 .func = bpf_getsockopt,
3323 .ret_type = RET_INTEGER,
3324 .arg1_type = ARG_PTR_TO_CTX,
3325 .arg2_type = ARG_ANYTHING,
3326 .arg3_type = ARG_ANYTHING,
3327 .arg4_type = ARG_PTR_TO_UNINIT_MEM,
3328 .arg5_type = ARG_CONST_SIZE,
3331 static const struct bpf_func_proto *
3332 bpf_base_func_proto(enum bpf_func_id func_id)
3335 case BPF_FUNC_map_lookup_elem:
3336 return &bpf_map_lookup_elem_proto;
3337 case BPF_FUNC_map_update_elem:
3338 return &bpf_map_update_elem_proto;
3339 case BPF_FUNC_map_delete_elem:
3340 return &bpf_map_delete_elem_proto;
3341 case BPF_FUNC_get_prandom_u32:
3342 return &bpf_get_prandom_u32_proto;
3343 case BPF_FUNC_get_smp_processor_id:
3344 return &bpf_get_raw_smp_processor_id_proto;
3345 case BPF_FUNC_get_numa_node_id:
3346 return &bpf_get_numa_node_id_proto;
3347 case BPF_FUNC_tail_call:
3348 return &bpf_tail_call_proto;
3349 case BPF_FUNC_ktime_get_ns:
3350 return &bpf_ktime_get_ns_proto;
3351 case BPF_FUNC_trace_printk:
3352 if (capable(CAP_SYS_ADMIN))
3353 return bpf_get_trace_printk_proto();
3359 static const struct bpf_func_proto *
3360 sock_filter_func_proto(enum bpf_func_id func_id)
3363 /* inet and inet6 sockets are created in a process
3364 * context so there is always a valid uid/gid
3366 case BPF_FUNC_get_current_uid_gid:
3367 return &bpf_get_current_uid_gid_proto;
3369 return bpf_base_func_proto(func_id);
3373 static const struct bpf_func_proto *
3374 sk_filter_func_proto(enum bpf_func_id func_id)
3377 case BPF_FUNC_skb_load_bytes:
3378 return &bpf_skb_load_bytes_proto;
3379 case BPF_FUNC_get_socket_cookie:
3380 return &bpf_get_socket_cookie_proto;
3381 case BPF_FUNC_get_socket_uid:
3382 return &bpf_get_socket_uid_proto;
3384 return bpf_base_func_proto(func_id);
3388 static const struct bpf_func_proto *
3389 tc_cls_act_func_proto(enum bpf_func_id func_id)
3392 case BPF_FUNC_skb_store_bytes:
3393 return &bpf_skb_store_bytes_proto;
3394 case BPF_FUNC_skb_load_bytes:
3395 return &bpf_skb_load_bytes_proto;
3396 case BPF_FUNC_skb_pull_data:
3397 return &bpf_skb_pull_data_proto;
3398 case BPF_FUNC_csum_diff:
3399 return &bpf_csum_diff_proto;
3400 case BPF_FUNC_csum_update:
3401 return &bpf_csum_update_proto;
3402 case BPF_FUNC_l3_csum_replace:
3403 return &bpf_l3_csum_replace_proto;
3404 case BPF_FUNC_l4_csum_replace:
3405 return &bpf_l4_csum_replace_proto;
3406 case BPF_FUNC_clone_redirect:
3407 return &bpf_clone_redirect_proto;
3408 case BPF_FUNC_get_cgroup_classid:
3409 return &bpf_get_cgroup_classid_proto;
3410 case BPF_FUNC_skb_vlan_push:
3411 return &bpf_skb_vlan_push_proto;
3412 case BPF_FUNC_skb_vlan_pop:
3413 return &bpf_skb_vlan_pop_proto;
3414 case BPF_FUNC_skb_change_proto:
3415 return &bpf_skb_change_proto_proto;
3416 case BPF_FUNC_skb_change_type:
3417 return &bpf_skb_change_type_proto;
3418 case BPF_FUNC_skb_adjust_room:
3419 return &bpf_skb_adjust_room_proto;
3420 case BPF_FUNC_skb_change_tail:
3421 return &bpf_skb_change_tail_proto;
3422 case BPF_FUNC_skb_get_tunnel_key:
3423 return &bpf_skb_get_tunnel_key_proto;
3424 case BPF_FUNC_skb_set_tunnel_key:
3425 return bpf_get_skb_set_tunnel_proto(func_id);
3426 case BPF_FUNC_skb_get_tunnel_opt:
3427 return &bpf_skb_get_tunnel_opt_proto;
3428 case BPF_FUNC_skb_set_tunnel_opt:
3429 return bpf_get_skb_set_tunnel_proto(func_id);
3430 case BPF_FUNC_redirect:
3431 return &bpf_redirect_proto;
3432 case BPF_FUNC_get_route_realm:
3433 return &bpf_get_route_realm_proto;
3434 case BPF_FUNC_get_hash_recalc:
3435 return &bpf_get_hash_recalc_proto;
3436 case BPF_FUNC_set_hash_invalid:
3437 return &bpf_set_hash_invalid_proto;
3438 case BPF_FUNC_set_hash:
3439 return &bpf_set_hash_proto;
3440 case BPF_FUNC_perf_event_output:
3441 return &bpf_skb_event_output_proto;
3442 case BPF_FUNC_get_smp_processor_id:
3443 return &bpf_get_smp_processor_id_proto;
3444 case BPF_FUNC_skb_under_cgroup:
3445 return &bpf_skb_under_cgroup_proto;
3446 case BPF_FUNC_get_socket_cookie:
3447 return &bpf_get_socket_cookie_proto;
3448 case BPF_FUNC_get_socket_uid:
3449 return &bpf_get_socket_uid_proto;
3451 return bpf_base_func_proto(func_id);
3455 static const struct bpf_func_proto *
3456 xdp_func_proto(enum bpf_func_id func_id)
3459 case BPF_FUNC_perf_event_output:
3460 return &bpf_xdp_event_output_proto;
3461 case BPF_FUNC_get_smp_processor_id:
3462 return &bpf_get_smp_processor_id_proto;
3463 case BPF_FUNC_csum_diff:
3464 return &bpf_csum_diff_proto;
3465 case BPF_FUNC_xdp_adjust_head:
3466 return &bpf_xdp_adjust_head_proto;
3467 case BPF_FUNC_xdp_adjust_meta:
3468 return &bpf_xdp_adjust_meta_proto;
3469 case BPF_FUNC_redirect:
3470 return &bpf_xdp_redirect_proto;
3471 case BPF_FUNC_redirect_map:
3472 return &bpf_xdp_redirect_map_proto;
3474 return bpf_base_func_proto(func_id);
3478 static const struct bpf_func_proto *
3479 lwt_inout_func_proto(enum bpf_func_id func_id)
3482 case BPF_FUNC_skb_load_bytes:
3483 return &bpf_skb_load_bytes_proto;
3484 case BPF_FUNC_skb_pull_data:
3485 return &bpf_skb_pull_data_proto;
3486 case BPF_FUNC_csum_diff:
3487 return &bpf_csum_diff_proto;
3488 case BPF_FUNC_get_cgroup_classid:
3489 return &bpf_get_cgroup_classid_proto;
3490 case BPF_FUNC_get_route_realm:
3491 return &bpf_get_route_realm_proto;
3492 case BPF_FUNC_get_hash_recalc:
3493 return &bpf_get_hash_recalc_proto;
3494 case BPF_FUNC_perf_event_output:
3495 return &bpf_skb_event_output_proto;
3496 case BPF_FUNC_get_smp_processor_id:
3497 return &bpf_get_smp_processor_id_proto;
3498 case BPF_FUNC_skb_under_cgroup:
3499 return &bpf_skb_under_cgroup_proto;
3501 return bpf_base_func_proto(func_id);
3505 static const struct bpf_func_proto *
3506 sock_ops_func_proto(enum bpf_func_id func_id)
3509 case BPF_FUNC_setsockopt:
3510 return &bpf_setsockopt_proto;
3511 case BPF_FUNC_getsockopt:
3512 return &bpf_getsockopt_proto;
3513 case BPF_FUNC_sock_map_update:
3514 return &bpf_sock_map_update_proto;
3516 return bpf_base_func_proto(func_id);
3520 static const struct bpf_func_proto *sk_skb_func_proto(enum bpf_func_id func_id)
3523 case BPF_FUNC_skb_store_bytes:
3524 return &bpf_skb_store_bytes_proto;
3525 case BPF_FUNC_skb_load_bytes:
3526 return &bpf_skb_load_bytes_proto;
3527 case BPF_FUNC_skb_pull_data:
3528 return &bpf_skb_pull_data_proto;
3529 case BPF_FUNC_skb_change_tail:
3530 return &bpf_skb_change_tail_proto;
3531 case BPF_FUNC_skb_change_head:
3532 return &bpf_skb_change_head_proto;
3533 case BPF_FUNC_get_socket_cookie:
3534 return &bpf_get_socket_cookie_proto;
3535 case BPF_FUNC_get_socket_uid:
3536 return &bpf_get_socket_uid_proto;
3537 case BPF_FUNC_sk_redirect_map:
3538 return &bpf_sk_redirect_map_proto;
3540 return bpf_base_func_proto(func_id);
3544 static const struct bpf_func_proto *
3545 lwt_xmit_func_proto(enum bpf_func_id func_id)
3548 case BPF_FUNC_skb_get_tunnel_key:
3549 return &bpf_skb_get_tunnel_key_proto;
3550 case BPF_FUNC_skb_set_tunnel_key:
3551 return bpf_get_skb_set_tunnel_proto(func_id);
3552 case BPF_FUNC_skb_get_tunnel_opt:
3553 return &bpf_skb_get_tunnel_opt_proto;
3554 case BPF_FUNC_skb_set_tunnel_opt:
3555 return bpf_get_skb_set_tunnel_proto(func_id);
3556 case BPF_FUNC_redirect:
3557 return &bpf_redirect_proto;
3558 case BPF_FUNC_clone_redirect:
3559 return &bpf_clone_redirect_proto;
3560 case BPF_FUNC_skb_change_tail:
3561 return &bpf_skb_change_tail_proto;
3562 case BPF_FUNC_skb_change_head:
3563 return &bpf_skb_change_head_proto;
3564 case BPF_FUNC_skb_store_bytes:
3565 return &bpf_skb_store_bytes_proto;
3566 case BPF_FUNC_csum_update:
3567 return &bpf_csum_update_proto;
3568 case BPF_FUNC_l3_csum_replace:
3569 return &bpf_l3_csum_replace_proto;
3570 case BPF_FUNC_l4_csum_replace:
3571 return &bpf_l4_csum_replace_proto;
3572 case BPF_FUNC_set_hash_invalid:
3573 return &bpf_set_hash_invalid_proto;
3575 return lwt_inout_func_proto(func_id);
3579 static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type,
3580 struct bpf_insn_access_aux *info)
3582 const int size_default = sizeof(__u32);
3584 if (off < 0 || off >= sizeof(struct __sk_buff))
3587 /* The verifier guarantees that size > 0. */
3588 if (off % size != 0)
3592 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
3593 if (off + size > offsetofend(struct __sk_buff, cb[4]))
3596 case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]):
3597 case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]):
3598 case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4):
3599 case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4):
3600 case bpf_ctx_range(struct __sk_buff, data):
3601 case bpf_ctx_range(struct __sk_buff, data_meta):
3602 case bpf_ctx_range(struct __sk_buff, data_end):
3603 if (size != size_default)
3607 /* Only narrow read access allowed for now. */
3608 if (type == BPF_WRITE) {
3609 if (size != size_default)
3612 bpf_ctx_record_field_size(info, size_default);
3613 if (!bpf_ctx_narrow_access_ok(off, size, size_default))
3621 static bool sk_filter_is_valid_access(int off, int size,
3622 enum bpf_access_type type,
3623 struct bpf_insn_access_aux *info)
3626 case bpf_ctx_range(struct __sk_buff, tc_classid):
3627 case bpf_ctx_range(struct __sk_buff, data):
3628 case bpf_ctx_range(struct __sk_buff, data_meta):
3629 case bpf_ctx_range(struct __sk_buff, data_end):
3630 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
3634 if (type == BPF_WRITE) {
3636 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
3643 return bpf_skb_is_valid_access(off, size, type, info);
3646 static bool lwt_is_valid_access(int off, int size,
3647 enum bpf_access_type type,
3648 struct bpf_insn_access_aux *info)
3651 case bpf_ctx_range(struct __sk_buff, tc_classid):
3652 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
3653 case bpf_ctx_range(struct __sk_buff, data_meta):
3657 if (type == BPF_WRITE) {
3659 case bpf_ctx_range(struct __sk_buff, mark):
3660 case bpf_ctx_range(struct __sk_buff, priority):
3661 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
3669 case bpf_ctx_range(struct __sk_buff, data):
3670 info->reg_type = PTR_TO_PACKET;
3672 case bpf_ctx_range(struct __sk_buff, data_end):
3673 info->reg_type = PTR_TO_PACKET_END;
3677 return bpf_skb_is_valid_access(off, size, type, info);
3680 static bool sock_filter_is_valid_access(int off, int size,
3681 enum bpf_access_type type,
3682 struct bpf_insn_access_aux *info)
3684 if (type == BPF_WRITE) {
3686 case offsetof(struct bpf_sock, bound_dev_if):
3687 case offsetof(struct bpf_sock, mark):
3688 case offsetof(struct bpf_sock, priority):
3695 if (off < 0 || off + size > sizeof(struct bpf_sock))
3697 /* The verifier guarantees that size > 0. */
3698 if (off % size != 0)
3700 if (size != sizeof(__u32))
3706 static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write,
3707 const struct bpf_prog *prog, int drop_verdict)
3709 struct bpf_insn *insn = insn_buf;
3714 /* if (!skb->cloned)
3717 * (Fast-path, otherwise approximation that we might be
3718 * a clone, do the rest in helper.)
3720 *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET());
3721 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK);
3722 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7);
3724 /* ret = bpf_skb_pull_data(skb, 0); */
3725 *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
3726 *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2);
3727 *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
3728 BPF_FUNC_skb_pull_data);
3731 * return TC_ACT_SHOT;
3733 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2);
3734 *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict);
3735 *insn++ = BPF_EXIT_INSN();
3738 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6);
3740 *insn++ = prog->insnsi[0];
3742 return insn - insn_buf;
3745 static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write,
3746 const struct bpf_prog *prog)
3748 return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT);
3751 static bool tc_cls_act_is_valid_access(int off, int size,
3752 enum bpf_access_type type,
3753 struct bpf_insn_access_aux *info)
3755 if (type == BPF_WRITE) {
3757 case bpf_ctx_range(struct __sk_buff, mark):
3758 case bpf_ctx_range(struct __sk_buff, tc_index):
3759 case bpf_ctx_range(struct __sk_buff, priority):
3760 case bpf_ctx_range(struct __sk_buff, tc_classid):
3761 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
3769 case bpf_ctx_range(struct __sk_buff, data):
3770 info->reg_type = PTR_TO_PACKET;
3772 case bpf_ctx_range(struct __sk_buff, data_meta):
3773 info->reg_type = PTR_TO_PACKET_META;
3775 case bpf_ctx_range(struct __sk_buff, data_end):
3776 info->reg_type = PTR_TO_PACKET_END;
3778 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
3782 return bpf_skb_is_valid_access(off, size, type, info);
3785 static bool __is_valid_xdp_access(int off, int size)
3787 if (off < 0 || off >= sizeof(struct xdp_md))
3789 if (off % size != 0)
3791 if (size != sizeof(__u32))
3797 static bool xdp_is_valid_access(int off, int size,
3798 enum bpf_access_type type,
3799 struct bpf_insn_access_aux *info)
3801 if (type == BPF_WRITE)
3805 case offsetof(struct xdp_md, data):
3806 info->reg_type = PTR_TO_PACKET;
3808 case offsetof(struct xdp_md, data_meta):
3809 info->reg_type = PTR_TO_PACKET_META;
3811 case offsetof(struct xdp_md, data_end):
3812 info->reg_type = PTR_TO_PACKET_END;
3816 return __is_valid_xdp_access(off, size);
3819 void bpf_warn_invalid_xdp_action(u32 act)
3821 const u32 act_max = XDP_REDIRECT;
3823 WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n",
3824 act > act_max ? "Illegal" : "Driver unsupported",
3827 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action);
3829 static bool __is_valid_sock_ops_access(int off, int size)
3831 if (off < 0 || off >= sizeof(struct bpf_sock_ops))
3833 /* The verifier guarantees that size > 0. */
3834 if (off % size != 0)
3836 if (size != sizeof(__u32))
3842 static bool sock_ops_is_valid_access(int off, int size,
3843 enum bpf_access_type type,
3844 struct bpf_insn_access_aux *info)
3846 if (type == BPF_WRITE) {
3848 case offsetof(struct bpf_sock_ops, op) ...
3849 offsetof(struct bpf_sock_ops, replylong[3]):
3856 return __is_valid_sock_ops_access(off, size);
3859 static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write,
3860 const struct bpf_prog *prog)
3862 return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP);
3865 static bool sk_skb_is_valid_access(int off, int size,
3866 enum bpf_access_type type,
3867 struct bpf_insn_access_aux *info)
3870 case bpf_ctx_range(struct __sk_buff, tc_classid):
3871 case bpf_ctx_range(struct __sk_buff, data_meta):
3875 if (type == BPF_WRITE) {
3877 case bpf_ctx_range(struct __sk_buff, tc_index):
3878 case bpf_ctx_range(struct __sk_buff, priority):
3886 case bpf_ctx_range(struct __sk_buff, mark):
3888 case bpf_ctx_range(struct __sk_buff, data):
3889 info->reg_type = PTR_TO_PACKET;
3891 case bpf_ctx_range(struct __sk_buff, data_end):
3892 info->reg_type = PTR_TO_PACKET_END;
3896 return bpf_skb_is_valid_access(off, size, type, info);
3899 static u32 bpf_convert_ctx_access(enum bpf_access_type type,
3900 const struct bpf_insn *si,
3901 struct bpf_insn *insn_buf,
3902 struct bpf_prog *prog, u32 *target_size)
3904 struct bpf_insn *insn = insn_buf;
3908 case offsetof(struct __sk_buff, len):
3909 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
3910 bpf_target_off(struct sk_buff, len, 4,
3914 case offsetof(struct __sk_buff, protocol):
3915 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
3916 bpf_target_off(struct sk_buff, protocol, 2,
3920 case offsetof(struct __sk_buff, vlan_proto):
3921 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
3922 bpf_target_off(struct sk_buff, vlan_proto, 2,
3926 case offsetof(struct __sk_buff, priority):
3927 if (type == BPF_WRITE)
3928 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
3929 bpf_target_off(struct sk_buff, priority, 4,
3932 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
3933 bpf_target_off(struct sk_buff, priority, 4,
3937 case offsetof(struct __sk_buff, ingress_ifindex):
3938 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
3939 bpf_target_off(struct sk_buff, skb_iif, 4,
3943 case offsetof(struct __sk_buff, ifindex):
3944 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
3945 si->dst_reg, si->src_reg,
3946 offsetof(struct sk_buff, dev));
3947 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
3948 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
3949 bpf_target_off(struct net_device, ifindex, 4,
3953 case offsetof(struct __sk_buff, hash):
3954 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
3955 bpf_target_off(struct sk_buff, hash, 4,
3959 case offsetof(struct __sk_buff, mark):
3960 if (type == BPF_WRITE)
3961 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
3962 bpf_target_off(struct sk_buff, mark, 4,
3965 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
3966 bpf_target_off(struct sk_buff, mark, 4,
3970 case offsetof(struct __sk_buff, pkt_type):
3972 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg,
3974 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX);
3975 #ifdef __BIG_ENDIAN_BITFIELD
3976 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5);
3980 case offsetof(struct __sk_buff, queue_mapping):
3981 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
3982 bpf_target_off(struct sk_buff, queue_mapping, 2,
3986 case offsetof(struct __sk_buff, vlan_present):
3987 case offsetof(struct __sk_buff, vlan_tci):
3988 BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000);
3990 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
3991 bpf_target_off(struct sk_buff, vlan_tci, 2,
3993 if (si->off == offsetof(struct __sk_buff, vlan_tci)) {
3994 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg,
3997 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 12);
3998 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1);
4002 case offsetof(struct __sk_buff, cb[0]) ...
4003 offsetofend(struct __sk_buff, cb[4]) - 1:
4004 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, data) < 20);
4005 BUILD_BUG_ON((offsetof(struct sk_buff, cb) +
4006 offsetof(struct qdisc_skb_cb, data)) %
4009 prog->cb_access = 1;
4011 off -= offsetof(struct __sk_buff, cb[0]);
4012 off += offsetof(struct sk_buff, cb);
4013 off += offsetof(struct qdisc_skb_cb, data);
4014 if (type == BPF_WRITE)
4015 *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg,
4018 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg,
4022 case offsetof(struct __sk_buff, tc_classid):
4023 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, tc_classid) != 2);
4026 off -= offsetof(struct __sk_buff, tc_classid);
4027 off += offsetof(struct sk_buff, cb);
4028 off += offsetof(struct qdisc_skb_cb, tc_classid);
4030 if (type == BPF_WRITE)
4031 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg,
4034 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg,
4038 case offsetof(struct __sk_buff, data):
4039 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
4040 si->dst_reg, si->src_reg,
4041 offsetof(struct sk_buff, data));
4044 case offsetof(struct __sk_buff, data_meta):
4046 off -= offsetof(struct __sk_buff, data_meta);
4047 off += offsetof(struct sk_buff, cb);
4048 off += offsetof(struct bpf_skb_data_end, data_meta);
4049 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
4053 case offsetof(struct __sk_buff, data_end):
4055 off -= offsetof(struct __sk_buff, data_end);
4056 off += offsetof(struct sk_buff, cb);
4057 off += offsetof(struct bpf_skb_data_end, data_end);
4058 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
4062 case offsetof(struct __sk_buff, tc_index):
4063 #ifdef CONFIG_NET_SCHED
4064 if (type == BPF_WRITE)
4065 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg,
4066 bpf_target_off(struct sk_buff, tc_index, 2,
4069 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
4070 bpf_target_off(struct sk_buff, tc_index, 2,
4074 if (type == BPF_WRITE)
4075 *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg);
4077 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
4081 case offsetof(struct __sk_buff, napi_id):
4082 #if defined(CONFIG_NET_RX_BUSY_POLL)
4083 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4084 bpf_target_off(struct sk_buff, napi_id, 4,
4086 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1);
4087 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
4090 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
4093 case offsetof(struct __sk_buff, family):
4094 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2);
4096 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4097 si->dst_reg, si->src_reg,
4098 offsetof(struct sk_buff, sk));
4099 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4100 bpf_target_off(struct sock_common,
4104 case offsetof(struct __sk_buff, remote_ip4):
4105 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4);
4107 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4108 si->dst_reg, si->src_reg,
4109 offsetof(struct sk_buff, sk));
4110 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4111 bpf_target_off(struct sock_common,
4115 case offsetof(struct __sk_buff, local_ip4):
4116 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4117 skc_rcv_saddr) != 4);
4119 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4120 si->dst_reg, si->src_reg,
4121 offsetof(struct sk_buff, sk));
4122 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4123 bpf_target_off(struct sock_common,
4127 case offsetof(struct __sk_buff, remote_ip6[0]) ...
4128 offsetof(struct __sk_buff, remote_ip6[3]):
4129 #if IS_ENABLED(CONFIG_IPV6)
4130 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4131 skc_v6_daddr.s6_addr32[0]) != 4);
4134 off -= offsetof(struct __sk_buff, remote_ip6[0]);
4136 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4137 si->dst_reg, si->src_reg,
4138 offsetof(struct sk_buff, sk));
4139 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4140 offsetof(struct sock_common,
4141 skc_v6_daddr.s6_addr32[0]) +
4144 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
4147 case offsetof(struct __sk_buff, local_ip6[0]) ...
4148 offsetof(struct __sk_buff, local_ip6[3]):
4149 #if IS_ENABLED(CONFIG_IPV6)
4150 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4151 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
4154 off -= offsetof(struct __sk_buff, local_ip6[0]);
4156 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4157 si->dst_reg, si->src_reg,
4158 offsetof(struct sk_buff, sk));
4159 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4160 offsetof(struct sock_common,
4161 skc_v6_rcv_saddr.s6_addr32[0]) +
4164 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
4168 case offsetof(struct __sk_buff, remote_port):
4169 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2);
4171 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4172 si->dst_reg, si->src_reg,
4173 offsetof(struct sk_buff, sk));
4174 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4175 bpf_target_off(struct sock_common,
4178 #ifndef __BIG_ENDIAN_BITFIELD
4179 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
4183 case offsetof(struct __sk_buff, local_port):
4184 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2);
4186 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4187 si->dst_reg, si->src_reg,
4188 offsetof(struct sk_buff, sk));
4189 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4190 bpf_target_off(struct sock_common,
4191 skc_num, 2, target_size));
4195 return insn - insn_buf;
4198 static u32 sock_filter_convert_ctx_access(enum bpf_access_type type,
4199 const struct bpf_insn *si,
4200 struct bpf_insn *insn_buf,
4201 struct bpf_prog *prog, u32 *target_size)
4203 struct bpf_insn *insn = insn_buf;
4206 case offsetof(struct bpf_sock, bound_dev_if):
4207 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_bound_dev_if) != 4);
4209 if (type == BPF_WRITE)
4210 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
4211 offsetof(struct sock, sk_bound_dev_if));
4213 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4214 offsetof(struct sock, sk_bound_dev_if));
4217 case offsetof(struct bpf_sock, mark):
4218 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_mark) != 4);
4220 if (type == BPF_WRITE)
4221 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
4222 offsetof(struct sock, sk_mark));
4224 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4225 offsetof(struct sock, sk_mark));
4228 case offsetof(struct bpf_sock, priority):
4229 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_priority) != 4);
4231 if (type == BPF_WRITE)
4232 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
4233 offsetof(struct sock, sk_priority));
4235 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4236 offsetof(struct sock, sk_priority));
4239 case offsetof(struct bpf_sock, family):
4240 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_family) != 2);
4242 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
4243 offsetof(struct sock, sk_family));
4246 case offsetof(struct bpf_sock, type):
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_TYPE_MASK);
4250 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT);
4253 case offsetof(struct bpf_sock, protocol):
4254 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4255 offsetof(struct sock, __sk_flags_offset));
4256 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK);
4257 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_PROTO_SHIFT);
4261 return insn - insn_buf;
4264 static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type,
4265 const struct bpf_insn *si,
4266 struct bpf_insn *insn_buf,
4267 struct bpf_prog *prog, u32 *target_size)
4269 struct bpf_insn *insn = insn_buf;
4272 case offsetof(struct __sk_buff, ifindex):
4273 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
4274 si->dst_reg, si->src_reg,
4275 offsetof(struct sk_buff, dev));
4276 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4277 bpf_target_off(struct net_device, ifindex, 4,
4281 return bpf_convert_ctx_access(type, si, insn_buf, prog,
4285 return insn - insn_buf;
4288 static u32 xdp_convert_ctx_access(enum bpf_access_type type,
4289 const struct bpf_insn *si,
4290 struct bpf_insn *insn_buf,
4291 struct bpf_prog *prog, u32 *target_size)
4293 struct bpf_insn *insn = insn_buf;
4296 case offsetof(struct xdp_md, data):
4297 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data),
4298 si->dst_reg, si->src_reg,
4299 offsetof(struct xdp_buff, data));
4301 case offsetof(struct xdp_md, data_meta):
4302 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta),
4303 si->dst_reg, si->src_reg,
4304 offsetof(struct xdp_buff, data_meta));
4306 case offsetof(struct xdp_md, data_end):
4307 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end),
4308 si->dst_reg, si->src_reg,
4309 offsetof(struct xdp_buff, data_end));
4311 case offsetof(struct xdp_md, ingress_ifindex):
4312 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
4313 si->dst_reg, si->src_reg,
4314 offsetof(struct xdp_buff, rxq));
4315 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev),
4316 si->dst_reg, si->dst_reg,
4317 offsetof(struct xdp_rxq_info, dev));
4318 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4319 offsetof(struct net_device, ifindex));
4321 case offsetof(struct xdp_md, rx_queue_index):
4322 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
4323 si->dst_reg, si->src_reg,
4324 offsetof(struct xdp_buff, rxq));
4325 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4326 offsetof(struct xdp_rxq_info,
4331 return insn - insn_buf;
4334 static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
4335 const struct bpf_insn *si,
4336 struct bpf_insn *insn_buf,
4337 struct bpf_prog *prog,
4340 struct bpf_insn *insn = insn_buf;
4344 case offsetof(struct bpf_sock_ops, op) ...
4345 offsetof(struct bpf_sock_ops, replylong[3]):
4346 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, op) !=
4347 FIELD_SIZEOF(struct bpf_sock_ops_kern, op));
4348 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, reply) !=
4349 FIELD_SIZEOF(struct bpf_sock_ops_kern, reply));
4350 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, replylong) !=
4351 FIELD_SIZEOF(struct bpf_sock_ops_kern, replylong));
4353 off -= offsetof(struct bpf_sock_ops, op);
4354 off += offsetof(struct bpf_sock_ops_kern, op);
4355 if (type == BPF_WRITE)
4356 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
4359 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4363 case offsetof(struct bpf_sock_ops, family):
4364 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2);
4366 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4367 struct bpf_sock_ops_kern, sk),
4368 si->dst_reg, si->src_reg,
4369 offsetof(struct bpf_sock_ops_kern, sk));
4370 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4371 offsetof(struct sock_common, skc_family));
4374 case offsetof(struct bpf_sock_ops, remote_ip4):
4375 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4);
4377 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4378 struct bpf_sock_ops_kern, sk),
4379 si->dst_reg, si->src_reg,
4380 offsetof(struct bpf_sock_ops_kern, sk));
4381 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4382 offsetof(struct sock_common, skc_daddr));
4385 case offsetof(struct bpf_sock_ops, local_ip4):
4386 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_rcv_saddr) != 4);
4388 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4389 struct bpf_sock_ops_kern, sk),
4390 si->dst_reg, si->src_reg,
4391 offsetof(struct bpf_sock_ops_kern, sk));
4392 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4393 offsetof(struct sock_common,
4397 case offsetof(struct bpf_sock_ops, remote_ip6[0]) ...
4398 offsetof(struct bpf_sock_ops, remote_ip6[3]):
4399 #if IS_ENABLED(CONFIG_IPV6)
4400 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4401 skc_v6_daddr.s6_addr32[0]) != 4);
4404 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]);
4405 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4406 struct bpf_sock_ops_kern, sk),
4407 si->dst_reg, si->src_reg,
4408 offsetof(struct bpf_sock_ops_kern, sk));
4409 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4410 offsetof(struct sock_common,
4411 skc_v6_daddr.s6_addr32[0]) +
4414 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
4418 case offsetof(struct bpf_sock_ops, local_ip6[0]) ...
4419 offsetof(struct bpf_sock_ops, local_ip6[3]):
4420 #if IS_ENABLED(CONFIG_IPV6)
4421 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4422 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
4425 off -= offsetof(struct bpf_sock_ops, local_ip6[0]);
4426 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4427 struct bpf_sock_ops_kern, sk),
4428 si->dst_reg, si->src_reg,
4429 offsetof(struct bpf_sock_ops_kern, sk));
4430 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4431 offsetof(struct sock_common,
4432 skc_v6_rcv_saddr.s6_addr32[0]) +
4435 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
4439 case offsetof(struct bpf_sock_ops, remote_port):
4440 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2);
4442 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4443 struct bpf_sock_ops_kern, sk),
4444 si->dst_reg, si->src_reg,
4445 offsetof(struct bpf_sock_ops_kern, sk));
4446 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4447 offsetof(struct sock_common, skc_dport));
4448 #ifndef __BIG_ENDIAN_BITFIELD
4449 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
4453 case offsetof(struct bpf_sock_ops, local_port):
4454 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2);
4456 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4457 struct bpf_sock_ops_kern, sk),
4458 si->dst_reg, si->src_reg,
4459 offsetof(struct bpf_sock_ops_kern, sk));
4460 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4461 offsetof(struct sock_common, skc_num));
4464 case offsetof(struct bpf_sock_ops, is_fullsock):
4465 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4466 struct bpf_sock_ops_kern,
4468 si->dst_reg, si->src_reg,
4469 offsetof(struct bpf_sock_ops_kern,
4473 /* Helper macro for adding read access to tcp_sock fields. */
4474 #define SOCK_OPS_GET_TCP32(FIELD_NAME) \
4476 BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, FIELD_NAME) != 4); \
4477 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
4478 struct bpf_sock_ops_kern, \
4480 si->dst_reg, si->src_reg, \
4481 offsetof(struct bpf_sock_ops_kern, \
4483 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 2); \
4484 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
4485 struct bpf_sock_ops_kern, sk),\
4486 si->dst_reg, si->src_reg, \
4487 offsetof(struct bpf_sock_ops_kern, sk));\
4488 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, \
4489 offsetof(struct tcp_sock, FIELD_NAME)); \
4492 case offsetof(struct bpf_sock_ops, snd_cwnd):
4493 SOCK_OPS_GET_TCP32(snd_cwnd);
4496 case offsetof(struct bpf_sock_ops, srtt_us):
4497 SOCK_OPS_GET_TCP32(srtt_us);
4500 return insn - insn_buf;
4503 static u32 sk_skb_convert_ctx_access(enum bpf_access_type type,
4504 const struct bpf_insn *si,
4505 struct bpf_insn *insn_buf,
4506 struct bpf_prog *prog, u32 *target_size)
4508 struct bpf_insn *insn = insn_buf;
4512 case offsetof(struct __sk_buff, data_end):
4514 off -= offsetof(struct __sk_buff, data_end);
4515 off += offsetof(struct sk_buff, cb);
4516 off += offsetof(struct tcp_skb_cb, bpf.data_end);
4517 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
4521 return bpf_convert_ctx_access(type, si, insn_buf, prog,
4525 return insn - insn_buf;
4528 const struct bpf_verifier_ops sk_filter_verifier_ops = {
4529 .get_func_proto = sk_filter_func_proto,
4530 .is_valid_access = sk_filter_is_valid_access,
4531 .convert_ctx_access = bpf_convert_ctx_access,
4534 const struct bpf_prog_ops sk_filter_prog_ops = {
4535 .test_run = bpf_prog_test_run_skb,
4538 const struct bpf_verifier_ops tc_cls_act_verifier_ops = {
4539 .get_func_proto = tc_cls_act_func_proto,
4540 .is_valid_access = tc_cls_act_is_valid_access,
4541 .convert_ctx_access = tc_cls_act_convert_ctx_access,
4542 .gen_prologue = tc_cls_act_prologue,
4545 const struct bpf_prog_ops tc_cls_act_prog_ops = {
4546 .test_run = bpf_prog_test_run_skb,
4549 const struct bpf_verifier_ops xdp_verifier_ops = {
4550 .get_func_proto = xdp_func_proto,
4551 .is_valid_access = xdp_is_valid_access,
4552 .convert_ctx_access = xdp_convert_ctx_access,
4555 const struct bpf_prog_ops xdp_prog_ops = {
4556 .test_run = bpf_prog_test_run_xdp,
4559 const struct bpf_verifier_ops cg_skb_verifier_ops = {
4560 .get_func_proto = sk_filter_func_proto,
4561 .is_valid_access = sk_filter_is_valid_access,
4562 .convert_ctx_access = bpf_convert_ctx_access,
4565 const struct bpf_prog_ops cg_skb_prog_ops = {
4566 .test_run = bpf_prog_test_run_skb,
4569 const struct bpf_verifier_ops lwt_inout_verifier_ops = {
4570 .get_func_proto = lwt_inout_func_proto,
4571 .is_valid_access = lwt_is_valid_access,
4572 .convert_ctx_access = bpf_convert_ctx_access,
4575 const struct bpf_prog_ops lwt_inout_prog_ops = {
4576 .test_run = bpf_prog_test_run_skb,
4579 const struct bpf_verifier_ops lwt_xmit_verifier_ops = {
4580 .get_func_proto = lwt_xmit_func_proto,
4581 .is_valid_access = lwt_is_valid_access,
4582 .convert_ctx_access = bpf_convert_ctx_access,
4583 .gen_prologue = tc_cls_act_prologue,
4586 const struct bpf_prog_ops lwt_xmit_prog_ops = {
4587 .test_run = bpf_prog_test_run_skb,
4590 const struct bpf_verifier_ops cg_sock_verifier_ops = {
4591 .get_func_proto = sock_filter_func_proto,
4592 .is_valid_access = sock_filter_is_valid_access,
4593 .convert_ctx_access = sock_filter_convert_ctx_access,
4596 const struct bpf_prog_ops cg_sock_prog_ops = {
4599 const struct bpf_verifier_ops sock_ops_verifier_ops = {
4600 .get_func_proto = sock_ops_func_proto,
4601 .is_valid_access = sock_ops_is_valid_access,
4602 .convert_ctx_access = sock_ops_convert_ctx_access,
4605 const struct bpf_prog_ops sock_ops_prog_ops = {
4608 const struct bpf_verifier_ops sk_skb_verifier_ops = {
4609 .get_func_proto = sk_skb_func_proto,
4610 .is_valid_access = sk_skb_is_valid_access,
4611 .convert_ctx_access = sk_skb_convert_ctx_access,
4612 .gen_prologue = sk_skb_prologue,
4615 const struct bpf_prog_ops sk_skb_prog_ops = {
4618 int sk_detach_filter(struct sock *sk)
4621 struct sk_filter *filter;
4623 if (sock_flag(sk, SOCK_FILTER_LOCKED))
4626 filter = rcu_dereference_protected(sk->sk_filter,
4627 lockdep_sock_is_held(sk));
4629 RCU_INIT_POINTER(sk->sk_filter, NULL);
4630 sk_filter_uncharge(sk, filter);
4636 EXPORT_SYMBOL_GPL(sk_detach_filter);
4638 int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf,
4641 struct sock_fprog_kern *fprog;
4642 struct sk_filter *filter;
4646 filter = rcu_dereference_protected(sk->sk_filter,
4647 lockdep_sock_is_held(sk));
4651 /* We're copying the filter that has been originally attached,
4652 * so no conversion/decode needed anymore. eBPF programs that
4653 * have no original program cannot be dumped through this.
4656 fprog = filter->prog->orig_prog;
4662 /* User space only enquires number of filter blocks. */
4666 if (len < fprog->len)
4670 if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog)))
4673 /* Instead of bytes, the API requests to return the number