1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Linux Socket Filter - Kernel level socket filtering
5 * Based on the design of the Berkeley Packet Filter. The new
6 * internal format has been designed by PLUMgrid:
8 * Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com
12 * Jay Schulist <jschlst@samba.org>
13 * Alexei Starovoitov <ast@plumgrid.com>
14 * Daniel Borkmann <dborkman@redhat.com>
16 * Andi Kleen - Fix a few bad bugs and races.
17 * Kris Katterjohn - Added many additional checks in bpf_check_classic()
20 #include <linux/module.h>
21 #include <linux/types.h>
23 #include <linux/fcntl.h>
24 #include <linux/socket.h>
25 #include <linux/sock_diag.h>
27 #include <linux/inet.h>
28 #include <linux/netdevice.h>
29 #include <linux/if_packet.h>
30 #include <linux/if_arp.h>
31 #include <linux/gfp.h>
32 #include <net/inet_common.h>
34 #include <net/protocol.h>
35 #include <net/netlink.h>
36 #include <linux/skbuff.h>
37 #include <linux/skmsg.h>
39 #include <net/flow_dissector.h>
40 #include <linux/errno.h>
41 #include <linux/timer.h>
42 #include <linux/uaccess.h>
43 #include <asm/unaligned.h>
44 #include <asm/cmpxchg.h>
45 #include <linux/filter.h>
46 #include <linux/ratelimit.h>
47 #include <linux/seccomp.h>
48 #include <linux/if_vlan.h>
49 #include <linux/bpf.h>
50 #include <net/sch_generic.h>
51 #include <net/cls_cgroup.h>
52 #include <net/dst_metadata.h>
54 #include <net/sock_reuseport.h>
55 #include <net/busy_poll.h>
59 #include <linux/bpf_trace.h>
60 #include <net/xdp_sock.h>
61 #include <linux/inetdevice.h>
62 #include <net/inet_hashtables.h>
63 #include <net/inet6_hashtables.h>
64 #include <net/ip_fib.h>
65 #include <net/nexthop.h>
69 #include <net/net_namespace.h>
70 #include <linux/seg6_local.h>
72 #include <net/seg6_local.h>
73 #include <net/lwtunnel.h>
74 #include <net/ipv6_stubs.h>
75 #include <net/bpf_sk_storage.h>
78 * sk_filter_trim_cap - run a packet through a socket filter
79 * @sk: sock associated with &sk_buff
80 * @skb: buffer to filter
81 * @cap: limit on how short the eBPF program may trim the packet
83 * Run the eBPF program and then cut skb->data to correct size returned by
84 * the program. If pkt_len is 0 we toss packet. If skb->len is smaller
85 * than pkt_len we keep whole skb->data. This is the socket level
86 * wrapper to BPF_PROG_RUN. It returns 0 if the packet should
87 * be accepted or -EPERM if the packet should be tossed.
90 int sk_filter_trim_cap(struct sock
*sk
, struct sk_buff
*skb
, unsigned int cap
)
93 struct sk_filter
*filter
;
96 * If the skb was allocated from pfmemalloc reserves, only
97 * allow SOCK_MEMALLOC sockets to use it as this socket is
100 if (skb_pfmemalloc(skb
) && !sock_flag(sk
, SOCK_MEMALLOC
)) {
101 NET_INC_STATS(sock_net(sk
), LINUX_MIB_PFMEMALLOCDROP
);
104 err
= BPF_CGROUP_RUN_PROG_INET_INGRESS(sk
, skb
);
108 err
= security_sock_rcv_skb(sk
, skb
);
113 filter
= rcu_dereference(sk
->sk_filter
);
115 struct sock
*save_sk
= skb
->sk
;
116 unsigned int pkt_len
;
119 pkt_len
= bpf_prog_run_save_cb(filter
->prog
, skb
);
121 err
= pkt_len
? pskb_trim(skb
, max(cap
, pkt_len
)) : -EPERM
;
127 EXPORT_SYMBOL(sk_filter_trim_cap
);
129 BPF_CALL_1(bpf_skb_get_pay_offset
, struct sk_buff
*, skb
)
131 return skb_get_poff(skb
);
134 BPF_CALL_3(bpf_skb_get_nlattr
, struct sk_buff
*, skb
, u32
, a
, u32
, x
)
138 if (skb_is_nonlinear(skb
))
141 if (skb
->len
< sizeof(struct nlattr
))
144 if (a
> skb
->len
- sizeof(struct nlattr
))
147 nla
= nla_find((struct nlattr
*) &skb
->data
[a
], skb
->len
- a
, x
);
149 return (void *) nla
- (void *) skb
->data
;
154 BPF_CALL_3(bpf_skb_get_nlattr_nest
, struct sk_buff
*, skb
, u32
, a
, u32
, x
)
158 if (skb_is_nonlinear(skb
))
161 if (skb
->len
< sizeof(struct nlattr
))
164 if (a
> skb
->len
- sizeof(struct nlattr
))
167 nla
= (struct nlattr
*) &skb
->data
[a
];
168 if (nla
->nla_len
> skb
->len
- a
)
171 nla
= nla_find_nested(nla
, x
);
173 return (void *) nla
- (void *) skb
->data
;
178 BPF_CALL_4(bpf_skb_load_helper_8
, const struct sk_buff
*, skb
, const void *,
179 data
, int, headlen
, int, offset
)
182 const int len
= sizeof(tmp
);
185 if (headlen
- offset
>= len
)
186 return *(u8
*)(data
+ offset
);
187 if (!skb_copy_bits(skb
, offset
, &tmp
, sizeof(tmp
)))
190 ptr
= bpf_internal_load_pointer_neg_helper(skb
, offset
, len
);
198 BPF_CALL_2(bpf_skb_load_helper_8_no_cache
, const struct sk_buff
*, skb
,
201 return ____bpf_skb_load_helper_8(skb
, skb
->data
, skb
->len
- skb
->data_len
,
205 BPF_CALL_4(bpf_skb_load_helper_16
, const struct sk_buff
*, skb
, const void *,
206 data
, int, headlen
, int, offset
)
209 const int len
= sizeof(tmp
);
212 if (headlen
- offset
>= len
)
213 return get_unaligned_be16(data
+ offset
);
214 if (!skb_copy_bits(skb
, offset
, &tmp
, sizeof(tmp
)))
215 return be16_to_cpu(tmp
);
217 ptr
= bpf_internal_load_pointer_neg_helper(skb
, offset
, len
);
219 return get_unaligned_be16(ptr
);
225 BPF_CALL_2(bpf_skb_load_helper_16_no_cache
, const struct sk_buff
*, skb
,
228 return ____bpf_skb_load_helper_16(skb
, skb
->data
, skb
->len
- skb
->data_len
,
232 BPF_CALL_4(bpf_skb_load_helper_32
, const struct sk_buff
*, skb
, const void *,
233 data
, int, headlen
, int, offset
)
236 const int len
= sizeof(tmp
);
238 if (likely(offset
>= 0)) {
239 if (headlen
- offset
>= len
)
240 return get_unaligned_be32(data
+ offset
);
241 if (!skb_copy_bits(skb
, offset
, &tmp
, sizeof(tmp
)))
242 return be32_to_cpu(tmp
);
244 ptr
= bpf_internal_load_pointer_neg_helper(skb
, offset
, len
);
246 return get_unaligned_be32(ptr
);
252 BPF_CALL_2(bpf_skb_load_helper_32_no_cache
, const struct sk_buff
*, skb
,
255 return ____bpf_skb_load_helper_32(skb
, skb
->data
, skb
->len
- skb
->data_len
,
259 BPF_CALL_0(bpf_get_raw_cpu_id
)
261 return raw_smp_processor_id();
264 static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto
= {
265 .func
= bpf_get_raw_cpu_id
,
267 .ret_type
= RET_INTEGER
,
270 static u32
convert_skb_access(int skb_field
, int dst_reg
, int src_reg
,
271 struct bpf_insn
*insn_buf
)
273 struct bpf_insn
*insn
= insn_buf
;
277 BUILD_BUG_ON(sizeof_field(struct sk_buff
, mark
) != 4);
279 *insn
++ = BPF_LDX_MEM(BPF_W
, dst_reg
, src_reg
,
280 offsetof(struct sk_buff
, mark
));
284 *insn
++ = BPF_LDX_MEM(BPF_B
, dst_reg
, src_reg
, PKT_TYPE_OFFSET());
285 *insn
++ = BPF_ALU32_IMM(BPF_AND
, dst_reg
, PKT_TYPE_MAX
);
286 #ifdef __BIG_ENDIAN_BITFIELD
287 *insn
++ = BPF_ALU32_IMM(BPF_RSH
, dst_reg
, 5);
292 BUILD_BUG_ON(sizeof_field(struct sk_buff
, queue_mapping
) != 2);
294 *insn
++ = BPF_LDX_MEM(BPF_H
, dst_reg
, src_reg
,
295 offsetof(struct sk_buff
, queue_mapping
));
298 case SKF_AD_VLAN_TAG
:
299 BUILD_BUG_ON(sizeof_field(struct sk_buff
, vlan_tci
) != 2);
301 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */
302 *insn
++ = BPF_LDX_MEM(BPF_H
, dst_reg
, src_reg
,
303 offsetof(struct sk_buff
, vlan_tci
));
305 case SKF_AD_VLAN_TAG_PRESENT
:
306 *insn
++ = BPF_LDX_MEM(BPF_B
, dst_reg
, src_reg
, PKT_VLAN_PRESENT_OFFSET());
307 if (PKT_VLAN_PRESENT_BIT
)
308 *insn
++ = BPF_ALU32_IMM(BPF_RSH
, dst_reg
, PKT_VLAN_PRESENT_BIT
);
309 if (PKT_VLAN_PRESENT_BIT
< 7)
310 *insn
++ = BPF_ALU32_IMM(BPF_AND
, dst_reg
, 1);
314 return insn
- insn_buf
;
317 static bool convert_bpf_extensions(struct sock_filter
*fp
,
318 struct bpf_insn
**insnp
)
320 struct bpf_insn
*insn
= *insnp
;
324 case SKF_AD_OFF
+ SKF_AD_PROTOCOL
:
325 BUILD_BUG_ON(sizeof_field(struct sk_buff
, protocol
) != 2);
327 /* A = *(u16 *) (CTX + offsetof(protocol)) */
328 *insn
++ = BPF_LDX_MEM(BPF_H
, BPF_REG_A
, BPF_REG_CTX
,
329 offsetof(struct sk_buff
, protocol
));
330 /* A = ntohs(A) [emitting a nop or swap16] */
331 *insn
= BPF_ENDIAN(BPF_FROM_BE
, BPF_REG_A
, 16);
334 case SKF_AD_OFF
+ SKF_AD_PKTTYPE
:
335 cnt
= convert_skb_access(SKF_AD_PKTTYPE
, BPF_REG_A
, BPF_REG_CTX
, insn
);
339 case SKF_AD_OFF
+ SKF_AD_IFINDEX
:
340 case SKF_AD_OFF
+ SKF_AD_HATYPE
:
341 BUILD_BUG_ON(sizeof_field(struct net_device
, ifindex
) != 4);
342 BUILD_BUG_ON(sizeof_field(struct net_device
, type
) != 2);
344 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, dev
),
345 BPF_REG_TMP
, BPF_REG_CTX
,
346 offsetof(struct sk_buff
, dev
));
347 /* if (tmp != 0) goto pc + 1 */
348 *insn
++ = BPF_JMP_IMM(BPF_JNE
, BPF_REG_TMP
, 0, 1);
349 *insn
++ = BPF_EXIT_INSN();
350 if (fp
->k
== SKF_AD_OFF
+ SKF_AD_IFINDEX
)
351 *insn
= BPF_LDX_MEM(BPF_W
, BPF_REG_A
, BPF_REG_TMP
,
352 offsetof(struct net_device
, ifindex
));
354 *insn
= BPF_LDX_MEM(BPF_H
, BPF_REG_A
, BPF_REG_TMP
,
355 offsetof(struct net_device
, type
));
358 case SKF_AD_OFF
+ SKF_AD_MARK
:
359 cnt
= convert_skb_access(SKF_AD_MARK
, BPF_REG_A
, BPF_REG_CTX
, insn
);
363 case SKF_AD_OFF
+ SKF_AD_RXHASH
:
364 BUILD_BUG_ON(sizeof_field(struct sk_buff
, hash
) != 4);
366 *insn
= BPF_LDX_MEM(BPF_W
, BPF_REG_A
, BPF_REG_CTX
,
367 offsetof(struct sk_buff
, hash
));
370 case SKF_AD_OFF
+ SKF_AD_QUEUE
:
371 cnt
= convert_skb_access(SKF_AD_QUEUE
, BPF_REG_A
, BPF_REG_CTX
, insn
);
375 case SKF_AD_OFF
+ SKF_AD_VLAN_TAG
:
376 cnt
= convert_skb_access(SKF_AD_VLAN_TAG
,
377 BPF_REG_A
, BPF_REG_CTX
, insn
);
381 case SKF_AD_OFF
+ SKF_AD_VLAN_TAG_PRESENT
:
382 cnt
= convert_skb_access(SKF_AD_VLAN_TAG_PRESENT
,
383 BPF_REG_A
, BPF_REG_CTX
, insn
);
387 case SKF_AD_OFF
+ SKF_AD_VLAN_TPID
:
388 BUILD_BUG_ON(sizeof_field(struct sk_buff
, vlan_proto
) != 2);
390 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */
391 *insn
++ = BPF_LDX_MEM(BPF_H
, BPF_REG_A
, BPF_REG_CTX
,
392 offsetof(struct sk_buff
, vlan_proto
));
393 /* A = ntohs(A) [emitting a nop or swap16] */
394 *insn
= BPF_ENDIAN(BPF_FROM_BE
, BPF_REG_A
, 16);
397 case SKF_AD_OFF
+ SKF_AD_PAY_OFFSET
:
398 case SKF_AD_OFF
+ SKF_AD_NLATTR
:
399 case SKF_AD_OFF
+ SKF_AD_NLATTR_NEST
:
400 case SKF_AD_OFF
+ SKF_AD_CPU
:
401 case SKF_AD_OFF
+ SKF_AD_RANDOM
:
403 *insn
++ = BPF_MOV64_REG(BPF_REG_ARG1
, BPF_REG_CTX
);
405 *insn
++ = BPF_MOV64_REG(BPF_REG_ARG2
, BPF_REG_A
);
407 *insn
++ = BPF_MOV64_REG(BPF_REG_ARG3
, BPF_REG_X
);
408 /* Emit call(arg1=CTX, arg2=A, arg3=X) */
410 case SKF_AD_OFF
+ SKF_AD_PAY_OFFSET
:
411 *insn
= BPF_EMIT_CALL(bpf_skb_get_pay_offset
);
413 case SKF_AD_OFF
+ SKF_AD_NLATTR
:
414 *insn
= BPF_EMIT_CALL(bpf_skb_get_nlattr
);
416 case SKF_AD_OFF
+ SKF_AD_NLATTR_NEST
:
417 *insn
= BPF_EMIT_CALL(bpf_skb_get_nlattr_nest
);
419 case SKF_AD_OFF
+ SKF_AD_CPU
:
420 *insn
= BPF_EMIT_CALL(bpf_get_raw_cpu_id
);
422 case SKF_AD_OFF
+ SKF_AD_RANDOM
:
423 *insn
= BPF_EMIT_CALL(bpf_user_rnd_u32
);
424 bpf_user_rnd_init_once();
429 case SKF_AD_OFF
+ SKF_AD_ALU_XOR_X
:
431 *insn
= BPF_ALU32_REG(BPF_XOR
, BPF_REG_A
, BPF_REG_X
);
435 /* This is just a dummy call to avoid letting the compiler
436 * evict __bpf_call_base() as an optimization. Placed here
437 * where no-one bothers.
439 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0);
447 static bool convert_bpf_ld_abs(struct sock_filter
*fp
, struct bpf_insn
**insnp
)
449 const bool unaligned_ok
= IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
);
450 int size
= bpf_size_to_bytes(BPF_SIZE(fp
->code
));
451 bool endian
= BPF_SIZE(fp
->code
) == BPF_H
||
452 BPF_SIZE(fp
->code
) == BPF_W
;
453 bool indirect
= BPF_MODE(fp
->code
) == BPF_IND
;
454 const int ip_align
= NET_IP_ALIGN
;
455 struct bpf_insn
*insn
= *insnp
;
459 ((unaligned_ok
&& offset
>= 0) ||
460 (!unaligned_ok
&& offset
>= 0 &&
461 offset
+ ip_align
>= 0 &&
462 offset
+ ip_align
% size
== 0))) {
463 bool ldx_off_ok
= offset
<= S16_MAX
;
465 *insn
++ = BPF_MOV64_REG(BPF_REG_TMP
, BPF_REG_H
);
467 *insn
++ = BPF_ALU64_IMM(BPF_SUB
, BPF_REG_TMP
, offset
);
468 *insn
++ = BPF_JMP_IMM(BPF_JSLT
, BPF_REG_TMP
,
469 size
, 2 + endian
+ (!ldx_off_ok
* 2));
471 *insn
++ = BPF_LDX_MEM(BPF_SIZE(fp
->code
), BPF_REG_A
,
474 *insn
++ = BPF_MOV64_REG(BPF_REG_TMP
, BPF_REG_D
);
475 *insn
++ = BPF_ALU64_IMM(BPF_ADD
, BPF_REG_TMP
, offset
);
476 *insn
++ = BPF_LDX_MEM(BPF_SIZE(fp
->code
), BPF_REG_A
,
480 *insn
++ = BPF_ENDIAN(BPF_FROM_BE
, BPF_REG_A
, size
* 8);
481 *insn
++ = BPF_JMP_A(8);
484 *insn
++ = BPF_MOV64_REG(BPF_REG_ARG1
, BPF_REG_CTX
);
485 *insn
++ = BPF_MOV64_REG(BPF_REG_ARG2
, BPF_REG_D
);
486 *insn
++ = BPF_MOV64_REG(BPF_REG_ARG3
, BPF_REG_H
);
488 *insn
++ = BPF_MOV64_IMM(BPF_REG_ARG4
, offset
);
490 *insn
++ = BPF_MOV64_REG(BPF_REG_ARG4
, BPF_REG_X
);
492 *insn
++ = BPF_ALU64_IMM(BPF_ADD
, BPF_REG_ARG4
, offset
);
495 switch (BPF_SIZE(fp
->code
)) {
497 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_8
);
500 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_16
);
503 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_32
);
509 *insn
++ = BPF_JMP_IMM(BPF_JSGE
, BPF_REG_A
, 0, 2);
510 *insn
++ = BPF_ALU32_REG(BPF_XOR
, BPF_REG_A
, BPF_REG_A
);
511 *insn
= BPF_EXIT_INSN();
518 * bpf_convert_filter - convert filter program
519 * @prog: the user passed filter program
520 * @len: the length of the user passed filter program
521 * @new_prog: allocated 'struct bpf_prog' or NULL
522 * @new_len: pointer to store length of converted program
523 * @seen_ld_abs: bool whether we've seen ld_abs/ind
525 * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn'
526 * style extended BPF (eBPF).
527 * Conversion workflow:
529 * 1) First pass for calculating the new program length:
530 * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs)
532 * 2) 2nd pass to remap in two passes: 1st pass finds new
533 * jump offsets, 2nd pass remapping:
534 * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs)
536 static int bpf_convert_filter(struct sock_filter
*prog
, int len
,
537 struct bpf_prog
*new_prog
, int *new_len
,
540 int new_flen
= 0, pass
= 0, target
, i
, stack_off
;
541 struct bpf_insn
*new_insn
, *first_insn
= NULL
;
542 struct sock_filter
*fp
;
546 BUILD_BUG_ON(BPF_MEMWORDS
* sizeof(u32
) > MAX_BPF_STACK
);
547 BUILD_BUG_ON(BPF_REG_FP
+ 1 != MAX_BPF_REG
);
549 if (len
<= 0 || len
> BPF_MAXINSNS
)
553 first_insn
= new_prog
->insnsi
;
554 addrs
= kcalloc(len
, sizeof(*addrs
),
555 GFP_KERNEL
| __GFP_NOWARN
);
561 new_insn
= first_insn
;
564 /* Classic BPF related prologue emission. */
566 /* Classic BPF expects A and X to be reset first. These need
567 * to be guaranteed to be the first two instructions.
569 *new_insn
++ = BPF_ALU32_REG(BPF_XOR
, BPF_REG_A
, BPF_REG_A
);
570 *new_insn
++ = BPF_ALU32_REG(BPF_XOR
, BPF_REG_X
, BPF_REG_X
);
572 /* All programs must keep CTX in callee saved BPF_REG_CTX.
573 * In eBPF case it's done by the compiler, here we need to
574 * do this ourself. Initial CTX is present in BPF_REG_ARG1.
576 *new_insn
++ = BPF_MOV64_REG(BPF_REG_CTX
, BPF_REG_ARG1
);
578 /* For packet access in classic BPF, cache skb->data
579 * in callee-saved BPF R8 and skb->len - skb->data_len
580 * (headlen) in BPF R9. Since classic BPF is read-only
581 * on CTX, we only need to cache it once.
583 *new_insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, data
),
584 BPF_REG_D
, BPF_REG_CTX
,
585 offsetof(struct sk_buff
, data
));
586 *new_insn
++ = BPF_LDX_MEM(BPF_W
, BPF_REG_H
, BPF_REG_CTX
,
587 offsetof(struct sk_buff
, len
));
588 *new_insn
++ = BPF_LDX_MEM(BPF_W
, BPF_REG_TMP
, BPF_REG_CTX
,
589 offsetof(struct sk_buff
, data_len
));
590 *new_insn
++ = BPF_ALU32_REG(BPF_SUB
, BPF_REG_H
, BPF_REG_TMP
);
596 for (i
= 0; i
< len
; fp
++, i
++) {
597 struct bpf_insn tmp_insns
[32] = { };
598 struct bpf_insn
*insn
= tmp_insns
;
601 addrs
[i
] = new_insn
- first_insn
;
604 /* All arithmetic insns and skb loads map as-is. */
605 case BPF_ALU
| BPF_ADD
| BPF_X
:
606 case BPF_ALU
| BPF_ADD
| BPF_K
:
607 case BPF_ALU
| BPF_SUB
| BPF_X
:
608 case BPF_ALU
| BPF_SUB
| BPF_K
:
609 case BPF_ALU
| BPF_AND
| BPF_X
:
610 case BPF_ALU
| BPF_AND
| BPF_K
:
611 case BPF_ALU
| BPF_OR
| BPF_X
:
612 case BPF_ALU
| BPF_OR
| BPF_K
:
613 case BPF_ALU
| BPF_LSH
| BPF_X
:
614 case BPF_ALU
| BPF_LSH
| BPF_K
:
615 case BPF_ALU
| BPF_RSH
| BPF_X
:
616 case BPF_ALU
| BPF_RSH
| BPF_K
:
617 case BPF_ALU
| BPF_XOR
| BPF_X
:
618 case BPF_ALU
| BPF_XOR
| BPF_K
:
619 case BPF_ALU
| BPF_MUL
| BPF_X
:
620 case BPF_ALU
| BPF_MUL
| BPF_K
:
621 case BPF_ALU
| BPF_DIV
| BPF_X
:
622 case BPF_ALU
| BPF_DIV
| BPF_K
:
623 case BPF_ALU
| BPF_MOD
| BPF_X
:
624 case BPF_ALU
| BPF_MOD
| BPF_K
:
625 case BPF_ALU
| BPF_NEG
:
626 case BPF_LD
| BPF_ABS
| BPF_W
:
627 case BPF_LD
| BPF_ABS
| BPF_H
:
628 case BPF_LD
| BPF_ABS
| BPF_B
:
629 case BPF_LD
| BPF_IND
| BPF_W
:
630 case BPF_LD
| BPF_IND
| BPF_H
:
631 case BPF_LD
| BPF_IND
| BPF_B
:
632 /* Check for overloaded BPF extension and
633 * directly convert it if found, otherwise
634 * just move on with mapping.
636 if (BPF_CLASS(fp
->code
) == BPF_LD
&&
637 BPF_MODE(fp
->code
) == BPF_ABS
&&
638 convert_bpf_extensions(fp
, &insn
))
640 if (BPF_CLASS(fp
->code
) == BPF_LD
&&
641 convert_bpf_ld_abs(fp
, &insn
)) {
646 if (fp
->code
== (BPF_ALU
| BPF_DIV
| BPF_X
) ||
647 fp
->code
== (BPF_ALU
| BPF_MOD
| BPF_X
)) {
648 *insn
++ = BPF_MOV32_REG(BPF_REG_X
, BPF_REG_X
);
649 /* Error with exception code on div/mod by 0.
650 * For cBPF programs, this was always return 0.
652 *insn
++ = BPF_JMP_IMM(BPF_JNE
, BPF_REG_X
, 0, 2);
653 *insn
++ = BPF_ALU32_REG(BPF_XOR
, BPF_REG_A
, BPF_REG_A
);
654 *insn
++ = BPF_EXIT_INSN();
657 *insn
= BPF_RAW_INSN(fp
->code
, BPF_REG_A
, BPF_REG_X
, 0, fp
->k
);
660 /* Jump transformation cannot use BPF block macros
661 * everywhere as offset calculation and target updates
662 * require a bit more work than the rest, i.e. jump
663 * opcodes map as-is, but offsets need adjustment.
666 #define BPF_EMIT_JMP \
668 const s32 off_min = S16_MIN, off_max = S16_MAX; \
671 if (target >= len || target < 0) \
673 off = addrs ? addrs[target] - addrs[i] - 1 : 0; \
674 /* Adjust pc relative offset for 2nd or 3rd insn. */ \
675 off -= insn - tmp_insns; \
676 /* Reject anything not fitting into insn->off. */ \
677 if (off < off_min || off > off_max) \
682 case BPF_JMP
| BPF_JA
:
683 target
= i
+ fp
->k
+ 1;
684 insn
->code
= fp
->code
;
688 case BPF_JMP
| BPF_JEQ
| BPF_K
:
689 case BPF_JMP
| BPF_JEQ
| BPF_X
:
690 case BPF_JMP
| BPF_JSET
| BPF_K
:
691 case BPF_JMP
| BPF_JSET
| BPF_X
:
692 case BPF_JMP
| BPF_JGT
| BPF_K
:
693 case BPF_JMP
| BPF_JGT
| BPF_X
:
694 case BPF_JMP
| BPF_JGE
| BPF_K
:
695 case BPF_JMP
| BPF_JGE
| BPF_X
:
696 if (BPF_SRC(fp
->code
) == BPF_K
&& (int) fp
->k
< 0) {
697 /* BPF immediates are signed, zero extend
698 * immediate into tmp register and use it
701 *insn
++ = BPF_MOV32_IMM(BPF_REG_TMP
, fp
->k
);
703 insn
->dst_reg
= BPF_REG_A
;
704 insn
->src_reg
= BPF_REG_TMP
;
707 insn
->dst_reg
= BPF_REG_A
;
709 bpf_src
= BPF_SRC(fp
->code
);
710 insn
->src_reg
= bpf_src
== BPF_X
? BPF_REG_X
: 0;
713 /* Common case where 'jump_false' is next insn. */
715 insn
->code
= BPF_JMP
| BPF_OP(fp
->code
) | bpf_src
;
716 target
= i
+ fp
->jt
+ 1;
721 /* Convert some jumps when 'jump_true' is next insn. */
723 switch (BPF_OP(fp
->code
)) {
725 insn
->code
= BPF_JMP
| BPF_JNE
| bpf_src
;
728 insn
->code
= BPF_JMP
| BPF_JLE
| bpf_src
;
731 insn
->code
= BPF_JMP
| BPF_JLT
| bpf_src
;
737 target
= i
+ fp
->jf
+ 1;
742 /* Other jumps are mapped into two insns: Jxx and JA. */
743 target
= i
+ fp
->jt
+ 1;
744 insn
->code
= BPF_JMP
| BPF_OP(fp
->code
) | bpf_src
;
748 insn
->code
= BPF_JMP
| BPF_JA
;
749 target
= i
+ fp
->jf
+ 1;
753 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */
754 case BPF_LDX
| BPF_MSH
| BPF_B
: {
755 struct sock_filter tmp
= {
756 .code
= BPF_LD
| BPF_ABS
| BPF_B
,
763 *insn
++ = BPF_MOV64_REG(BPF_REG_X
, BPF_REG_A
);
764 /* A = BPF_R0 = *(u8 *) (skb->data + K) */
765 convert_bpf_ld_abs(&tmp
, &insn
);
768 *insn
++ = BPF_ALU32_IMM(BPF_AND
, BPF_REG_A
, 0xf);
770 *insn
++ = BPF_ALU32_IMM(BPF_LSH
, BPF_REG_A
, 2);
772 *insn
++ = BPF_MOV64_REG(BPF_REG_TMP
, BPF_REG_X
);
774 *insn
++ = BPF_MOV64_REG(BPF_REG_X
, BPF_REG_A
);
776 *insn
= BPF_MOV64_REG(BPF_REG_A
, BPF_REG_TMP
);
779 /* RET_K is remaped into 2 insns. RET_A case doesn't need an
780 * extra mov as BPF_REG_0 is already mapped into BPF_REG_A.
782 case BPF_RET
| BPF_A
:
783 case BPF_RET
| BPF_K
:
784 if (BPF_RVAL(fp
->code
) == BPF_K
)
785 *insn
++ = BPF_MOV32_RAW(BPF_K
, BPF_REG_0
,
787 *insn
= BPF_EXIT_INSN();
790 /* Store to stack. */
793 stack_off
= fp
->k
* 4 + 4;
794 *insn
= BPF_STX_MEM(BPF_W
, BPF_REG_FP
, BPF_CLASS(fp
->code
) ==
795 BPF_ST
? BPF_REG_A
: BPF_REG_X
,
797 /* check_load_and_stores() verifies that classic BPF can
798 * load from stack only after write, so tracking
799 * stack_depth for ST|STX insns is enough
801 if (new_prog
&& new_prog
->aux
->stack_depth
< stack_off
)
802 new_prog
->aux
->stack_depth
= stack_off
;
805 /* Load from stack. */
806 case BPF_LD
| BPF_MEM
:
807 case BPF_LDX
| BPF_MEM
:
808 stack_off
= fp
->k
* 4 + 4;
809 *insn
= BPF_LDX_MEM(BPF_W
, BPF_CLASS(fp
->code
) == BPF_LD
?
810 BPF_REG_A
: BPF_REG_X
, BPF_REG_FP
,
815 case BPF_LD
| BPF_IMM
:
816 case BPF_LDX
| BPF_IMM
:
817 *insn
= BPF_MOV32_IMM(BPF_CLASS(fp
->code
) == BPF_LD
?
818 BPF_REG_A
: BPF_REG_X
, fp
->k
);
822 case BPF_MISC
| BPF_TAX
:
823 *insn
= BPF_MOV64_REG(BPF_REG_X
, BPF_REG_A
);
827 case BPF_MISC
| BPF_TXA
:
828 *insn
= BPF_MOV64_REG(BPF_REG_A
, BPF_REG_X
);
831 /* A = skb->len or X = skb->len */
832 case BPF_LD
| BPF_W
| BPF_LEN
:
833 case BPF_LDX
| BPF_W
| BPF_LEN
:
834 *insn
= BPF_LDX_MEM(BPF_W
, BPF_CLASS(fp
->code
) == BPF_LD
?
835 BPF_REG_A
: BPF_REG_X
, BPF_REG_CTX
,
836 offsetof(struct sk_buff
, len
));
839 /* Access seccomp_data fields. */
840 case BPF_LDX
| BPF_ABS
| BPF_W
:
841 /* A = *(u32 *) (ctx + K) */
842 *insn
= BPF_LDX_MEM(BPF_W
, BPF_REG_A
, BPF_REG_CTX
, fp
->k
);
845 /* Unknown instruction. */
852 memcpy(new_insn
, tmp_insns
,
853 sizeof(*insn
) * (insn
- tmp_insns
));
854 new_insn
+= insn
- tmp_insns
;
858 /* Only calculating new length. */
859 *new_len
= new_insn
- first_insn
;
861 *new_len
+= 4; /* Prologue bits. */
866 if (new_flen
!= new_insn
- first_insn
) {
867 new_flen
= new_insn
- first_insn
;
874 BUG_ON(*new_len
!= new_flen
);
883 * As we dont want to clear mem[] array for each packet going through
884 * __bpf_prog_run(), we check that filter loaded by user never try to read
885 * a cell if not previously written, and we check all branches to be sure
886 * a malicious user doesn't try to abuse us.
888 static int check_load_and_stores(const struct sock_filter
*filter
, int flen
)
890 u16
*masks
, memvalid
= 0; /* One bit per cell, 16 cells */
893 BUILD_BUG_ON(BPF_MEMWORDS
> 16);
895 masks
= kmalloc_array(flen
, sizeof(*masks
), GFP_KERNEL
);
899 memset(masks
, 0xff, flen
* sizeof(*masks
));
901 for (pc
= 0; pc
< flen
; pc
++) {
902 memvalid
&= masks
[pc
];
904 switch (filter
[pc
].code
) {
907 memvalid
|= (1 << filter
[pc
].k
);
909 case BPF_LD
| BPF_MEM
:
910 case BPF_LDX
| BPF_MEM
:
911 if (!(memvalid
& (1 << filter
[pc
].k
))) {
916 case BPF_JMP
| BPF_JA
:
917 /* A jump must set masks on target */
918 masks
[pc
+ 1 + filter
[pc
].k
] &= memvalid
;
921 case BPF_JMP
| BPF_JEQ
| BPF_K
:
922 case BPF_JMP
| BPF_JEQ
| BPF_X
:
923 case BPF_JMP
| BPF_JGE
| BPF_K
:
924 case BPF_JMP
| BPF_JGE
| BPF_X
:
925 case BPF_JMP
| BPF_JGT
| BPF_K
:
926 case BPF_JMP
| BPF_JGT
| BPF_X
:
927 case BPF_JMP
| BPF_JSET
| BPF_K
:
928 case BPF_JMP
| BPF_JSET
| BPF_X
:
929 /* A jump must set masks on targets */
930 masks
[pc
+ 1 + filter
[pc
].jt
] &= memvalid
;
931 masks
[pc
+ 1 + filter
[pc
].jf
] &= memvalid
;
941 static bool chk_code_allowed(u16 code_to_probe
)
943 static const bool codes
[] = {
944 /* 32 bit ALU operations */
945 [BPF_ALU
| BPF_ADD
| BPF_K
] = true,
946 [BPF_ALU
| BPF_ADD
| BPF_X
] = true,
947 [BPF_ALU
| BPF_SUB
| BPF_K
] = true,
948 [BPF_ALU
| BPF_SUB
| BPF_X
] = true,
949 [BPF_ALU
| BPF_MUL
| BPF_K
] = true,
950 [BPF_ALU
| BPF_MUL
| BPF_X
] = true,
951 [BPF_ALU
| BPF_DIV
| BPF_K
] = true,
952 [BPF_ALU
| BPF_DIV
| BPF_X
] = true,
953 [BPF_ALU
| BPF_MOD
| BPF_K
] = true,
954 [BPF_ALU
| BPF_MOD
| BPF_X
] = true,
955 [BPF_ALU
| BPF_AND
| BPF_K
] = true,
956 [BPF_ALU
| BPF_AND
| BPF_X
] = true,
957 [BPF_ALU
| BPF_OR
| BPF_K
] = true,
958 [BPF_ALU
| BPF_OR
| BPF_X
] = true,
959 [BPF_ALU
| BPF_XOR
| BPF_K
] = true,
960 [BPF_ALU
| BPF_XOR
| BPF_X
] = true,
961 [BPF_ALU
| BPF_LSH
| BPF_K
] = true,
962 [BPF_ALU
| BPF_LSH
| BPF_X
] = true,
963 [BPF_ALU
| BPF_RSH
| BPF_K
] = true,
964 [BPF_ALU
| BPF_RSH
| BPF_X
] = true,
965 [BPF_ALU
| BPF_NEG
] = true,
966 /* Load instructions */
967 [BPF_LD
| BPF_W
| BPF_ABS
] = true,
968 [BPF_LD
| BPF_H
| BPF_ABS
] = true,
969 [BPF_LD
| BPF_B
| BPF_ABS
] = true,
970 [BPF_LD
| BPF_W
| BPF_LEN
] = true,
971 [BPF_LD
| BPF_W
| BPF_IND
] = true,
972 [BPF_LD
| BPF_H
| BPF_IND
] = true,
973 [BPF_LD
| BPF_B
| BPF_IND
] = true,
974 [BPF_LD
| BPF_IMM
] = true,
975 [BPF_LD
| BPF_MEM
] = true,
976 [BPF_LDX
| BPF_W
| BPF_LEN
] = true,
977 [BPF_LDX
| BPF_B
| BPF_MSH
] = true,
978 [BPF_LDX
| BPF_IMM
] = true,
979 [BPF_LDX
| BPF_MEM
] = true,
980 /* Store instructions */
983 /* Misc instructions */
984 [BPF_MISC
| BPF_TAX
] = true,
985 [BPF_MISC
| BPF_TXA
] = true,
986 /* Return instructions */
987 [BPF_RET
| BPF_K
] = true,
988 [BPF_RET
| BPF_A
] = true,
989 /* Jump instructions */
990 [BPF_JMP
| BPF_JA
] = true,
991 [BPF_JMP
| BPF_JEQ
| BPF_K
] = true,
992 [BPF_JMP
| BPF_JEQ
| BPF_X
] = true,
993 [BPF_JMP
| BPF_JGE
| BPF_K
] = true,
994 [BPF_JMP
| BPF_JGE
| BPF_X
] = true,
995 [BPF_JMP
| BPF_JGT
| BPF_K
] = true,
996 [BPF_JMP
| BPF_JGT
| BPF_X
] = true,
997 [BPF_JMP
| BPF_JSET
| BPF_K
] = true,
998 [BPF_JMP
| BPF_JSET
| BPF_X
] = true,
1001 if (code_to_probe
>= ARRAY_SIZE(codes
))
1004 return codes
[code_to_probe
];
1007 static bool bpf_check_basics_ok(const struct sock_filter
*filter
,
1012 if (flen
== 0 || flen
> BPF_MAXINSNS
)
1019 * bpf_check_classic - verify socket filter code
1020 * @filter: filter to verify
1021 * @flen: length of filter
1023 * Check the user's filter code. If we let some ugly
1024 * filter code slip through kaboom! The filter must contain
1025 * no references or jumps that are out of range, no illegal
1026 * instructions, and must end with a RET instruction.
1028 * All jumps are forward as they are not signed.
1030 * Returns 0 if the rule set is legal or -EINVAL if not.
1032 static int bpf_check_classic(const struct sock_filter
*filter
,
1038 /* Check the filter code now */
1039 for (pc
= 0; pc
< flen
; pc
++) {
1040 const struct sock_filter
*ftest
= &filter
[pc
];
1042 /* May we actually operate on this code? */
1043 if (!chk_code_allowed(ftest
->code
))
1046 /* Some instructions need special checks */
1047 switch (ftest
->code
) {
1048 case BPF_ALU
| BPF_DIV
| BPF_K
:
1049 case BPF_ALU
| BPF_MOD
| BPF_K
:
1050 /* Check for division by zero */
1054 case BPF_ALU
| BPF_LSH
| BPF_K
:
1055 case BPF_ALU
| BPF_RSH
| BPF_K
:
1059 case BPF_LD
| BPF_MEM
:
1060 case BPF_LDX
| BPF_MEM
:
1063 /* Check for invalid memory addresses */
1064 if (ftest
->k
>= BPF_MEMWORDS
)
1067 case BPF_JMP
| BPF_JA
:
1068 /* Note, the large ftest->k might cause loops.
1069 * Compare this with conditional jumps below,
1070 * where offsets are limited. --ANK (981016)
1072 if (ftest
->k
>= (unsigned int)(flen
- pc
- 1))
1075 case BPF_JMP
| BPF_JEQ
| BPF_K
:
1076 case BPF_JMP
| BPF_JEQ
| BPF_X
:
1077 case BPF_JMP
| BPF_JGE
| BPF_K
:
1078 case BPF_JMP
| BPF_JGE
| BPF_X
:
1079 case BPF_JMP
| BPF_JGT
| BPF_K
:
1080 case BPF_JMP
| BPF_JGT
| BPF_X
:
1081 case BPF_JMP
| BPF_JSET
| BPF_K
:
1082 case BPF_JMP
| BPF_JSET
| BPF_X
:
1083 /* Both conditionals must be safe */
1084 if (pc
+ ftest
->jt
+ 1 >= flen
||
1085 pc
+ ftest
->jf
+ 1 >= flen
)
1088 case BPF_LD
| BPF_W
| BPF_ABS
:
1089 case BPF_LD
| BPF_H
| BPF_ABS
:
1090 case BPF_LD
| BPF_B
| BPF_ABS
:
1092 if (bpf_anc_helper(ftest
) & BPF_ANC
)
1094 /* Ancillary operation unknown or unsupported */
1095 if (anc_found
== false && ftest
->k
>= SKF_AD_OFF
)
1100 /* Last instruction must be a RET code */
1101 switch (filter
[flen
- 1].code
) {
1102 case BPF_RET
| BPF_K
:
1103 case BPF_RET
| BPF_A
:
1104 return check_load_and_stores(filter
, flen
);
1110 static int bpf_prog_store_orig_filter(struct bpf_prog
*fp
,
1111 const struct sock_fprog
*fprog
)
1113 unsigned int fsize
= bpf_classic_proglen(fprog
);
1114 struct sock_fprog_kern
*fkprog
;
1116 fp
->orig_prog
= kmalloc(sizeof(*fkprog
), GFP_KERNEL
);
1120 fkprog
= fp
->orig_prog
;
1121 fkprog
->len
= fprog
->len
;
1123 fkprog
->filter
= kmemdup(fp
->insns
, fsize
,
1124 GFP_KERNEL
| __GFP_NOWARN
);
1125 if (!fkprog
->filter
) {
1126 kfree(fp
->orig_prog
);
1133 static void bpf_release_orig_filter(struct bpf_prog
*fp
)
1135 struct sock_fprog_kern
*fprog
= fp
->orig_prog
;
1138 kfree(fprog
->filter
);
1143 static void __bpf_prog_release(struct bpf_prog
*prog
)
1145 if (prog
->type
== BPF_PROG_TYPE_SOCKET_FILTER
) {
1148 bpf_release_orig_filter(prog
);
1149 bpf_prog_free(prog
);
1153 static void __sk_filter_release(struct sk_filter
*fp
)
1155 __bpf_prog_release(fp
->prog
);
1160 * sk_filter_release_rcu - Release a socket filter by rcu_head
1161 * @rcu: rcu_head that contains the sk_filter to free
1163 static void sk_filter_release_rcu(struct rcu_head
*rcu
)
1165 struct sk_filter
*fp
= container_of(rcu
, struct sk_filter
, rcu
);
1167 __sk_filter_release(fp
);
1171 * sk_filter_release - release a socket filter
1172 * @fp: filter to remove
1174 * Remove a filter from a socket and release its resources.
1176 static void sk_filter_release(struct sk_filter
*fp
)
1178 if (refcount_dec_and_test(&fp
->refcnt
))
1179 call_rcu(&fp
->rcu
, sk_filter_release_rcu
);
1182 void sk_filter_uncharge(struct sock
*sk
, struct sk_filter
*fp
)
1184 u32 filter_size
= bpf_prog_size(fp
->prog
->len
);
1186 atomic_sub(filter_size
, &sk
->sk_omem_alloc
);
1187 sk_filter_release(fp
);
1190 /* try to charge the socket memory if there is space available
1191 * return true on success
1193 static bool __sk_filter_charge(struct sock
*sk
, struct sk_filter
*fp
)
1195 u32 filter_size
= bpf_prog_size(fp
->prog
->len
);
1197 /* same check as in sock_kmalloc() */
1198 if (filter_size
<= sysctl_optmem_max
&&
1199 atomic_read(&sk
->sk_omem_alloc
) + filter_size
< sysctl_optmem_max
) {
1200 atomic_add(filter_size
, &sk
->sk_omem_alloc
);
1206 bool sk_filter_charge(struct sock
*sk
, struct sk_filter
*fp
)
1208 if (!refcount_inc_not_zero(&fp
->refcnt
))
1211 if (!__sk_filter_charge(sk
, fp
)) {
1212 sk_filter_release(fp
);
1218 static struct bpf_prog
*bpf_migrate_filter(struct bpf_prog
*fp
)
1220 struct sock_filter
*old_prog
;
1221 struct bpf_prog
*old_fp
;
1222 int err
, new_len
, old_len
= fp
->len
;
1223 bool seen_ld_abs
= false;
1225 /* We are free to overwrite insns et al right here as it
1226 * won't be used at this point in time anymore internally
1227 * after the migration to the internal BPF instruction
1230 BUILD_BUG_ON(sizeof(struct sock_filter
) !=
1231 sizeof(struct bpf_insn
));
1233 /* Conversion cannot happen on overlapping memory areas,
1234 * so we need to keep the user BPF around until the 2nd
1235 * pass. At this time, the user BPF is stored in fp->insns.
1237 old_prog
= kmemdup(fp
->insns
, old_len
* sizeof(struct sock_filter
),
1238 GFP_KERNEL
| __GFP_NOWARN
);
1244 /* 1st pass: calculate the new program length. */
1245 err
= bpf_convert_filter(old_prog
, old_len
, NULL
, &new_len
,
1250 /* Expand fp for appending the new filter representation. */
1252 fp
= bpf_prog_realloc(old_fp
, bpf_prog_size(new_len
), 0);
1254 /* The old_fp is still around in case we couldn't
1255 * allocate new memory, so uncharge on that one.
1264 /* 2nd pass: remap sock_filter insns into bpf_insn insns. */
1265 err
= bpf_convert_filter(old_prog
, old_len
, fp
, &new_len
,
1268 /* 2nd bpf_convert_filter() can fail only if it fails
1269 * to allocate memory, remapping must succeed. Note,
1270 * that at this time old_fp has already been released
1275 fp
= bpf_prog_select_runtime(fp
, &err
);
1285 __bpf_prog_release(fp
);
1286 return ERR_PTR(err
);
1289 static struct bpf_prog
*bpf_prepare_filter(struct bpf_prog
*fp
,
1290 bpf_aux_classic_check_t trans
)
1294 fp
->bpf_func
= NULL
;
1297 err
= bpf_check_classic(fp
->insns
, fp
->len
);
1299 __bpf_prog_release(fp
);
1300 return ERR_PTR(err
);
1303 /* There might be additional checks and transformations
1304 * needed on classic filters, f.e. in case of seccomp.
1307 err
= trans(fp
->insns
, fp
->len
);
1309 __bpf_prog_release(fp
);
1310 return ERR_PTR(err
);
1314 /* Probe if we can JIT compile the filter and if so, do
1315 * the compilation of the filter.
1317 bpf_jit_compile(fp
);
1319 /* JIT compiler couldn't process this filter, so do the
1320 * internal BPF translation for the optimized interpreter.
1323 fp
= bpf_migrate_filter(fp
);
1329 * bpf_prog_create - create an unattached filter
1330 * @pfp: the unattached filter that is created
1331 * @fprog: the filter program
1333 * Create a filter independent of any socket. We first run some
1334 * sanity checks on it to make sure it does not explode on us later.
1335 * If an error occurs or there is insufficient memory for the filter
1336 * a negative errno code is returned. On success the return is zero.
1338 int bpf_prog_create(struct bpf_prog
**pfp
, struct sock_fprog_kern
*fprog
)
1340 unsigned int fsize
= bpf_classic_proglen(fprog
);
1341 struct bpf_prog
*fp
;
1343 /* Make sure new filter is there and in the right amounts. */
1344 if (!bpf_check_basics_ok(fprog
->filter
, fprog
->len
))
1347 fp
= bpf_prog_alloc(bpf_prog_size(fprog
->len
), 0);
1351 memcpy(fp
->insns
, fprog
->filter
, fsize
);
1353 fp
->len
= fprog
->len
;
1354 /* Since unattached filters are not copied back to user
1355 * space through sk_get_filter(), we do not need to hold
1356 * a copy here, and can spare us the work.
1358 fp
->orig_prog
= NULL
;
1360 /* bpf_prepare_filter() already takes care of freeing
1361 * memory in case something goes wrong.
1363 fp
= bpf_prepare_filter(fp
, NULL
);
1370 EXPORT_SYMBOL_GPL(bpf_prog_create
);
1373 * bpf_prog_create_from_user - create an unattached filter from user buffer
1374 * @pfp: the unattached filter that is created
1375 * @fprog: the filter program
1376 * @trans: post-classic verifier transformation handler
1377 * @save_orig: save classic BPF program
1379 * This function effectively does the same as bpf_prog_create(), only
1380 * that it builds up its insns buffer from user space provided buffer.
1381 * It also allows for passing a bpf_aux_classic_check_t handler.
1383 int bpf_prog_create_from_user(struct bpf_prog
**pfp
, struct sock_fprog
*fprog
,
1384 bpf_aux_classic_check_t trans
, bool save_orig
)
1386 unsigned int fsize
= bpf_classic_proglen(fprog
);
1387 struct bpf_prog
*fp
;
1390 /* Make sure new filter is there and in the right amounts. */
1391 if (!bpf_check_basics_ok(fprog
->filter
, fprog
->len
))
1394 fp
= bpf_prog_alloc(bpf_prog_size(fprog
->len
), 0);
1398 if (copy_from_user(fp
->insns
, fprog
->filter
, fsize
)) {
1399 __bpf_prog_free(fp
);
1403 fp
->len
= fprog
->len
;
1404 fp
->orig_prog
= NULL
;
1407 err
= bpf_prog_store_orig_filter(fp
, fprog
);
1409 __bpf_prog_free(fp
);
1414 /* bpf_prepare_filter() already takes care of freeing
1415 * memory in case something goes wrong.
1417 fp
= bpf_prepare_filter(fp
, trans
);
1424 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user
);
1426 void bpf_prog_destroy(struct bpf_prog
*fp
)
1428 __bpf_prog_release(fp
);
1430 EXPORT_SYMBOL_GPL(bpf_prog_destroy
);
1432 static int __sk_attach_prog(struct bpf_prog
*prog
, struct sock
*sk
)
1434 struct sk_filter
*fp
, *old_fp
;
1436 fp
= kmalloc(sizeof(*fp
), GFP_KERNEL
);
1442 if (!__sk_filter_charge(sk
, fp
)) {
1446 refcount_set(&fp
->refcnt
, 1);
1448 old_fp
= rcu_dereference_protected(sk
->sk_filter
,
1449 lockdep_sock_is_held(sk
));
1450 rcu_assign_pointer(sk
->sk_filter
, fp
);
1453 sk_filter_uncharge(sk
, old_fp
);
1459 struct bpf_prog
*__get_filter(struct sock_fprog
*fprog
, struct sock
*sk
)
1461 unsigned int fsize
= bpf_classic_proglen(fprog
);
1462 struct bpf_prog
*prog
;
1465 if (sock_flag(sk
, SOCK_FILTER_LOCKED
))
1466 return ERR_PTR(-EPERM
);
1468 /* Make sure new filter is there and in the right amounts. */
1469 if (!bpf_check_basics_ok(fprog
->filter
, fprog
->len
))
1470 return ERR_PTR(-EINVAL
);
1472 prog
= bpf_prog_alloc(bpf_prog_size(fprog
->len
), 0);
1474 return ERR_PTR(-ENOMEM
);
1476 if (copy_from_user(prog
->insns
, fprog
->filter
, fsize
)) {
1477 __bpf_prog_free(prog
);
1478 return ERR_PTR(-EFAULT
);
1481 prog
->len
= fprog
->len
;
1483 err
= bpf_prog_store_orig_filter(prog
, fprog
);
1485 __bpf_prog_free(prog
);
1486 return ERR_PTR(-ENOMEM
);
1489 /* bpf_prepare_filter() already takes care of freeing
1490 * memory in case something goes wrong.
1492 return bpf_prepare_filter(prog
, NULL
);
1496 * sk_attach_filter - attach a socket filter
1497 * @fprog: the filter program
1498 * @sk: the socket to use
1500 * Attach the user's filter code. We first run some sanity checks on
1501 * it to make sure it does not explode on us later. If an error
1502 * occurs or there is insufficient memory for the filter a negative
1503 * errno code is returned. On success the return is zero.
1505 int sk_attach_filter(struct sock_fprog
*fprog
, struct sock
*sk
)
1507 struct bpf_prog
*prog
= __get_filter(fprog
, sk
);
1511 return PTR_ERR(prog
);
1513 err
= __sk_attach_prog(prog
, sk
);
1515 __bpf_prog_release(prog
);
1521 EXPORT_SYMBOL_GPL(sk_attach_filter
);
1523 int sk_reuseport_attach_filter(struct sock_fprog
*fprog
, struct sock
*sk
)
1525 struct bpf_prog
*prog
= __get_filter(fprog
, sk
);
1529 return PTR_ERR(prog
);
1531 if (bpf_prog_size(prog
->len
) > sysctl_optmem_max
)
1534 err
= reuseport_attach_prog(sk
, prog
);
1537 __bpf_prog_release(prog
);
1542 static struct bpf_prog
*__get_bpf(u32 ufd
, struct sock
*sk
)
1544 if (sock_flag(sk
, SOCK_FILTER_LOCKED
))
1545 return ERR_PTR(-EPERM
);
1547 return bpf_prog_get_type(ufd
, BPF_PROG_TYPE_SOCKET_FILTER
);
1550 int sk_attach_bpf(u32 ufd
, struct sock
*sk
)
1552 struct bpf_prog
*prog
= __get_bpf(ufd
, sk
);
1556 return PTR_ERR(prog
);
1558 err
= __sk_attach_prog(prog
, sk
);
1567 int sk_reuseport_attach_bpf(u32 ufd
, struct sock
*sk
)
1569 struct bpf_prog
*prog
;
1572 if (sock_flag(sk
, SOCK_FILTER_LOCKED
))
1575 prog
= bpf_prog_get_type(ufd
, BPF_PROG_TYPE_SOCKET_FILTER
);
1576 if (PTR_ERR(prog
) == -EINVAL
)
1577 prog
= bpf_prog_get_type(ufd
, BPF_PROG_TYPE_SK_REUSEPORT
);
1579 return PTR_ERR(prog
);
1581 if (prog
->type
== BPF_PROG_TYPE_SK_REUSEPORT
) {
1582 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER
1583 * bpf prog (e.g. sockmap). It depends on the
1584 * limitation imposed by bpf_prog_load().
1585 * Hence, sysctl_optmem_max is not checked.
1587 if ((sk
->sk_type
!= SOCK_STREAM
&&
1588 sk
->sk_type
!= SOCK_DGRAM
) ||
1589 (sk
->sk_protocol
!= IPPROTO_UDP
&&
1590 sk
->sk_protocol
!= IPPROTO_TCP
) ||
1591 (sk
->sk_family
!= AF_INET
&&
1592 sk
->sk_family
!= AF_INET6
)) {
1597 /* BPF_PROG_TYPE_SOCKET_FILTER */
1598 if (bpf_prog_size(prog
->len
) > sysctl_optmem_max
) {
1604 err
= reuseport_attach_prog(sk
, prog
);
1612 void sk_reuseport_prog_free(struct bpf_prog
*prog
)
1617 if (prog
->type
== BPF_PROG_TYPE_SK_REUSEPORT
)
1620 bpf_prog_destroy(prog
);
1623 struct bpf_scratchpad
{
1625 __be32 diff
[MAX_BPF_STACK
/ sizeof(__be32
)];
1626 u8 buff
[MAX_BPF_STACK
];
1630 static DEFINE_PER_CPU(struct bpf_scratchpad
, bpf_sp
);
1632 static inline int __bpf_try_make_writable(struct sk_buff
*skb
,
1633 unsigned int write_len
)
1635 return skb_ensure_writable(skb
, write_len
);
1638 static inline int bpf_try_make_writable(struct sk_buff
*skb
,
1639 unsigned int write_len
)
1641 int err
= __bpf_try_make_writable(skb
, write_len
);
1643 bpf_compute_data_pointers(skb
);
1647 static int bpf_try_make_head_writable(struct sk_buff
*skb
)
1649 return bpf_try_make_writable(skb
, skb_headlen(skb
));
1652 static inline void bpf_push_mac_rcsum(struct sk_buff
*skb
)
1654 if (skb_at_tc_ingress(skb
))
1655 skb_postpush_rcsum(skb
, skb_mac_header(skb
), skb
->mac_len
);
1658 static inline void bpf_pull_mac_rcsum(struct sk_buff
*skb
)
1660 if (skb_at_tc_ingress(skb
))
1661 skb_postpull_rcsum(skb
, skb_mac_header(skb
), skb
->mac_len
);
1664 BPF_CALL_5(bpf_skb_store_bytes
, struct sk_buff
*, skb
, u32
, offset
,
1665 const void *, from
, u32
, len
, u64
, flags
)
1669 if (unlikely(flags
& ~(BPF_F_RECOMPUTE_CSUM
| BPF_F_INVALIDATE_HASH
)))
1671 if (unlikely(offset
> 0xffff))
1673 if (unlikely(bpf_try_make_writable(skb
, offset
+ len
)))
1676 ptr
= skb
->data
+ offset
;
1677 if (flags
& BPF_F_RECOMPUTE_CSUM
)
1678 __skb_postpull_rcsum(skb
, ptr
, len
, offset
);
1680 memcpy(ptr
, from
, len
);
1682 if (flags
& BPF_F_RECOMPUTE_CSUM
)
1683 __skb_postpush_rcsum(skb
, ptr
, len
, offset
);
1684 if (flags
& BPF_F_INVALIDATE_HASH
)
1685 skb_clear_hash(skb
);
1690 static const struct bpf_func_proto bpf_skb_store_bytes_proto
= {
1691 .func
= bpf_skb_store_bytes
,
1693 .ret_type
= RET_INTEGER
,
1694 .arg1_type
= ARG_PTR_TO_CTX
,
1695 .arg2_type
= ARG_ANYTHING
,
1696 .arg3_type
= ARG_PTR_TO_MEM
,
1697 .arg4_type
= ARG_CONST_SIZE
,
1698 .arg5_type
= ARG_ANYTHING
,
1701 BPF_CALL_4(bpf_skb_load_bytes
, const struct sk_buff
*, skb
, u32
, offset
,
1702 void *, to
, u32
, len
)
1706 if (unlikely(offset
> 0xffff))
1709 ptr
= skb_header_pointer(skb
, offset
, len
, to
);
1713 memcpy(to
, ptr
, len
);
1721 static const struct bpf_func_proto bpf_skb_load_bytes_proto
= {
1722 .func
= bpf_skb_load_bytes
,
1724 .ret_type
= RET_INTEGER
,
1725 .arg1_type
= ARG_PTR_TO_CTX
,
1726 .arg2_type
= ARG_ANYTHING
,
1727 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
1728 .arg4_type
= ARG_CONST_SIZE
,
1731 BPF_CALL_4(bpf_flow_dissector_load_bytes
,
1732 const struct bpf_flow_dissector
*, ctx
, u32
, offset
,
1733 void *, to
, u32
, len
)
1737 if (unlikely(offset
> 0xffff))
1740 if (unlikely(!ctx
->skb
))
1743 ptr
= skb_header_pointer(ctx
->skb
, offset
, len
, to
);
1747 memcpy(to
, ptr
, len
);
1755 static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto
= {
1756 .func
= bpf_flow_dissector_load_bytes
,
1758 .ret_type
= RET_INTEGER
,
1759 .arg1_type
= ARG_PTR_TO_CTX
,
1760 .arg2_type
= ARG_ANYTHING
,
1761 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
1762 .arg4_type
= ARG_CONST_SIZE
,
1765 BPF_CALL_5(bpf_skb_load_bytes_relative
, const struct sk_buff
*, skb
,
1766 u32
, offset
, void *, to
, u32
, len
, u32
, start_header
)
1768 u8
*end
= skb_tail_pointer(skb
);
1769 u8
*net
= skb_network_header(skb
);
1770 u8
*mac
= skb_mac_header(skb
);
1773 if (unlikely(offset
> 0xffff || len
> (end
- mac
)))
1776 switch (start_header
) {
1777 case BPF_HDR_START_MAC
:
1780 case BPF_HDR_START_NET
:
1787 if (likely(ptr
>= mac
&& ptr
+ len
<= end
)) {
1788 memcpy(to
, ptr
, len
);
1797 static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto
= {
1798 .func
= bpf_skb_load_bytes_relative
,
1800 .ret_type
= RET_INTEGER
,
1801 .arg1_type
= ARG_PTR_TO_CTX
,
1802 .arg2_type
= ARG_ANYTHING
,
1803 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
1804 .arg4_type
= ARG_CONST_SIZE
,
1805 .arg5_type
= ARG_ANYTHING
,
1808 BPF_CALL_2(bpf_skb_pull_data
, struct sk_buff
*, skb
, u32
, len
)
1810 /* Idea is the following: should the needed direct read/write
1811 * test fail during runtime, we can pull in more data and redo
1812 * again, since implicitly, we invalidate previous checks here.
1814 * Or, since we know how much we need to make read/writeable,
1815 * this can be done once at the program beginning for direct
1816 * access case. By this we overcome limitations of only current
1817 * headroom being accessible.
1819 return bpf_try_make_writable(skb
, len
? : skb_headlen(skb
));
1822 static const struct bpf_func_proto bpf_skb_pull_data_proto
= {
1823 .func
= bpf_skb_pull_data
,
1825 .ret_type
= RET_INTEGER
,
1826 .arg1_type
= ARG_PTR_TO_CTX
,
1827 .arg2_type
= ARG_ANYTHING
,
1830 BPF_CALL_1(bpf_sk_fullsock
, struct sock
*, sk
)
1832 return sk_fullsock(sk
) ? (unsigned long)sk
: (unsigned long)NULL
;
1835 static const struct bpf_func_proto bpf_sk_fullsock_proto
= {
1836 .func
= bpf_sk_fullsock
,
1838 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
1839 .arg1_type
= ARG_PTR_TO_SOCK_COMMON
,
1842 static inline int sk_skb_try_make_writable(struct sk_buff
*skb
,
1843 unsigned int write_len
)
1845 int err
= __bpf_try_make_writable(skb
, write_len
);
1847 bpf_compute_data_end_sk_skb(skb
);
1851 BPF_CALL_2(sk_skb_pull_data
, struct sk_buff
*, skb
, u32
, len
)
1853 /* Idea is the following: should the needed direct read/write
1854 * test fail during runtime, we can pull in more data and redo
1855 * again, since implicitly, we invalidate previous checks here.
1857 * Or, since we know how much we need to make read/writeable,
1858 * this can be done once at the program beginning for direct
1859 * access case. By this we overcome limitations of only current
1860 * headroom being accessible.
1862 return sk_skb_try_make_writable(skb
, len
? : skb_headlen(skb
));
1865 static const struct bpf_func_proto sk_skb_pull_data_proto
= {
1866 .func
= sk_skb_pull_data
,
1868 .ret_type
= RET_INTEGER
,
1869 .arg1_type
= ARG_PTR_TO_CTX
,
1870 .arg2_type
= ARG_ANYTHING
,
1873 BPF_CALL_5(bpf_l3_csum_replace
, struct sk_buff
*, skb
, u32
, offset
,
1874 u64
, from
, u64
, to
, u64
, flags
)
1878 if (unlikely(flags
& ~(BPF_F_HDR_FIELD_MASK
)))
1880 if (unlikely(offset
> 0xffff || offset
& 1))
1882 if (unlikely(bpf_try_make_writable(skb
, offset
+ sizeof(*ptr
))))
1885 ptr
= (__sum16
*)(skb
->data
+ offset
);
1886 switch (flags
& BPF_F_HDR_FIELD_MASK
) {
1888 if (unlikely(from
!= 0))
1891 csum_replace_by_diff(ptr
, to
);
1894 csum_replace2(ptr
, from
, to
);
1897 csum_replace4(ptr
, from
, to
);
1906 static const struct bpf_func_proto bpf_l3_csum_replace_proto
= {
1907 .func
= bpf_l3_csum_replace
,
1909 .ret_type
= RET_INTEGER
,
1910 .arg1_type
= ARG_PTR_TO_CTX
,
1911 .arg2_type
= ARG_ANYTHING
,
1912 .arg3_type
= ARG_ANYTHING
,
1913 .arg4_type
= ARG_ANYTHING
,
1914 .arg5_type
= ARG_ANYTHING
,
1917 BPF_CALL_5(bpf_l4_csum_replace
, struct sk_buff
*, skb
, u32
, offset
,
1918 u64
, from
, u64
, to
, u64
, flags
)
1920 bool is_pseudo
= flags
& BPF_F_PSEUDO_HDR
;
1921 bool is_mmzero
= flags
& BPF_F_MARK_MANGLED_0
;
1922 bool do_mforce
= flags
& BPF_F_MARK_ENFORCE
;
1925 if (unlikely(flags
& ~(BPF_F_MARK_MANGLED_0
| BPF_F_MARK_ENFORCE
|
1926 BPF_F_PSEUDO_HDR
| BPF_F_HDR_FIELD_MASK
)))
1928 if (unlikely(offset
> 0xffff || offset
& 1))
1930 if (unlikely(bpf_try_make_writable(skb
, offset
+ sizeof(*ptr
))))
1933 ptr
= (__sum16
*)(skb
->data
+ offset
);
1934 if (is_mmzero
&& !do_mforce
&& !*ptr
)
1937 switch (flags
& BPF_F_HDR_FIELD_MASK
) {
1939 if (unlikely(from
!= 0))
1942 inet_proto_csum_replace_by_diff(ptr
, skb
, to
, is_pseudo
);
1945 inet_proto_csum_replace2(ptr
, skb
, from
, to
, is_pseudo
);
1948 inet_proto_csum_replace4(ptr
, skb
, from
, to
, is_pseudo
);
1954 if (is_mmzero
&& !*ptr
)
1955 *ptr
= CSUM_MANGLED_0
;
1959 static const struct bpf_func_proto bpf_l4_csum_replace_proto
= {
1960 .func
= bpf_l4_csum_replace
,
1962 .ret_type
= RET_INTEGER
,
1963 .arg1_type
= ARG_PTR_TO_CTX
,
1964 .arg2_type
= ARG_ANYTHING
,
1965 .arg3_type
= ARG_ANYTHING
,
1966 .arg4_type
= ARG_ANYTHING
,
1967 .arg5_type
= ARG_ANYTHING
,
1970 BPF_CALL_5(bpf_csum_diff
, __be32
*, from
, u32
, from_size
,
1971 __be32
*, to
, u32
, to_size
, __wsum
, seed
)
1973 struct bpf_scratchpad
*sp
= this_cpu_ptr(&bpf_sp
);
1974 u32 diff_size
= from_size
+ to_size
;
1977 /* This is quite flexible, some examples:
1979 * from_size == 0, to_size > 0, seed := csum --> pushing data
1980 * from_size > 0, to_size == 0, seed := csum --> pulling data
1981 * from_size > 0, to_size > 0, seed := 0 --> diffing data
1983 * Even for diffing, from_size and to_size don't need to be equal.
1985 if (unlikely(((from_size
| to_size
) & (sizeof(__be32
) - 1)) ||
1986 diff_size
> sizeof(sp
->diff
)))
1989 for (i
= 0; i
< from_size
/ sizeof(__be32
); i
++, j
++)
1990 sp
->diff
[j
] = ~from
[i
];
1991 for (i
= 0; i
< to_size
/ sizeof(__be32
); i
++, j
++)
1992 sp
->diff
[j
] = to
[i
];
1994 return csum_partial(sp
->diff
, diff_size
, seed
);
1997 static const struct bpf_func_proto bpf_csum_diff_proto
= {
1998 .func
= bpf_csum_diff
,
2001 .ret_type
= RET_INTEGER
,
2002 .arg1_type
= ARG_PTR_TO_MEM_OR_NULL
,
2003 .arg2_type
= ARG_CONST_SIZE_OR_ZERO
,
2004 .arg3_type
= ARG_PTR_TO_MEM_OR_NULL
,
2005 .arg4_type
= ARG_CONST_SIZE_OR_ZERO
,
2006 .arg5_type
= ARG_ANYTHING
,
2009 BPF_CALL_2(bpf_csum_update
, struct sk_buff
*, skb
, __wsum
, csum
)
2011 /* The interface is to be used in combination with bpf_csum_diff()
2012 * for direct packet writes. csum rotation for alignment as well
2013 * as emulating csum_sub() can be done from the eBPF program.
2015 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2016 return (skb
->csum
= csum_add(skb
->csum
, csum
));
2021 static const struct bpf_func_proto bpf_csum_update_proto
= {
2022 .func
= bpf_csum_update
,
2024 .ret_type
= RET_INTEGER
,
2025 .arg1_type
= ARG_PTR_TO_CTX
,
2026 .arg2_type
= ARG_ANYTHING
,
2029 static inline int __bpf_rx_skb(struct net_device
*dev
, struct sk_buff
*skb
)
2031 return dev_forward_skb(dev
, skb
);
2034 static inline int __bpf_rx_skb_no_mac(struct net_device
*dev
,
2035 struct sk_buff
*skb
)
2037 int ret
= ____dev_forward_skb(dev
, skb
);
2041 ret
= netif_rx(skb
);
2047 static inline int __bpf_tx_skb(struct net_device
*dev
, struct sk_buff
*skb
)
2051 if (dev_xmit_recursion()) {
2052 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2060 dev_xmit_recursion_inc();
2061 ret
= dev_queue_xmit(skb
);
2062 dev_xmit_recursion_dec();
2067 static int __bpf_redirect_no_mac(struct sk_buff
*skb
, struct net_device
*dev
,
2070 unsigned int mlen
= skb_network_offset(skb
);
2073 __skb_pull(skb
, mlen
);
2075 /* At ingress, the mac header has already been pulled once.
2076 * At egress, skb_pospull_rcsum has to be done in case that
2077 * the skb is originated from ingress (i.e. a forwarded skb)
2078 * to ensure that rcsum starts at net header.
2080 if (!skb_at_tc_ingress(skb
))
2081 skb_postpull_rcsum(skb
, skb_mac_header(skb
), mlen
);
2083 skb_pop_mac_header(skb
);
2084 skb_reset_mac_len(skb
);
2085 return flags
& BPF_F_INGRESS
?
2086 __bpf_rx_skb_no_mac(dev
, skb
) : __bpf_tx_skb(dev
, skb
);
2089 static int __bpf_redirect_common(struct sk_buff
*skb
, struct net_device
*dev
,
2092 /* Verify that a link layer header is carried */
2093 if (unlikely(skb
->mac_header
>= skb
->network_header
)) {
2098 bpf_push_mac_rcsum(skb
);
2099 return flags
& BPF_F_INGRESS
?
2100 __bpf_rx_skb(dev
, skb
) : __bpf_tx_skb(dev
, skb
);
2103 static int __bpf_redirect(struct sk_buff
*skb
, struct net_device
*dev
,
2106 if (dev_is_mac_header_xmit(dev
))
2107 return __bpf_redirect_common(skb
, dev
, flags
);
2109 return __bpf_redirect_no_mac(skb
, dev
, flags
);
2112 BPF_CALL_3(bpf_clone_redirect
, struct sk_buff
*, skb
, u32
, ifindex
, u64
, flags
)
2114 struct net_device
*dev
;
2115 struct sk_buff
*clone
;
2118 if (unlikely(flags
& ~(BPF_F_INGRESS
)))
2121 dev
= dev_get_by_index_rcu(dev_net(skb
->dev
), ifindex
);
2125 clone
= skb_clone(skb
, GFP_ATOMIC
);
2126 if (unlikely(!clone
))
2129 /* For direct write, we need to keep the invariant that the skbs
2130 * we're dealing with need to be uncloned. Should uncloning fail
2131 * here, we need to free the just generated clone to unclone once
2134 ret
= bpf_try_make_head_writable(skb
);
2135 if (unlikely(ret
)) {
2140 return __bpf_redirect(clone
, dev
, flags
);
2143 static const struct bpf_func_proto bpf_clone_redirect_proto
= {
2144 .func
= bpf_clone_redirect
,
2146 .ret_type
= RET_INTEGER
,
2147 .arg1_type
= ARG_PTR_TO_CTX
,
2148 .arg2_type
= ARG_ANYTHING
,
2149 .arg3_type
= ARG_ANYTHING
,
2152 DEFINE_PER_CPU(struct bpf_redirect_info
, bpf_redirect_info
);
2153 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info
);
2155 BPF_CALL_2(bpf_redirect
, u32
, ifindex
, u64
, flags
)
2157 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
2159 if (unlikely(flags
& ~(BPF_F_INGRESS
)))
2163 ri
->tgt_index
= ifindex
;
2165 return TC_ACT_REDIRECT
;
2168 int skb_do_redirect(struct sk_buff
*skb
)
2170 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
2171 struct net_device
*dev
;
2173 dev
= dev_get_by_index_rcu(dev_net(skb
->dev
), ri
->tgt_index
);
2175 if (unlikely(!dev
)) {
2180 return __bpf_redirect(skb
, dev
, ri
->flags
);
2183 static const struct bpf_func_proto bpf_redirect_proto
= {
2184 .func
= bpf_redirect
,
2186 .ret_type
= RET_INTEGER
,
2187 .arg1_type
= ARG_ANYTHING
,
2188 .arg2_type
= ARG_ANYTHING
,
2191 BPF_CALL_2(bpf_msg_apply_bytes
, struct sk_msg
*, msg
, u32
, bytes
)
2193 msg
->apply_bytes
= bytes
;
2197 static const struct bpf_func_proto bpf_msg_apply_bytes_proto
= {
2198 .func
= bpf_msg_apply_bytes
,
2200 .ret_type
= RET_INTEGER
,
2201 .arg1_type
= ARG_PTR_TO_CTX
,
2202 .arg2_type
= ARG_ANYTHING
,
2205 BPF_CALL_2(bpf_msg_cork_bytes
, struct sk_msg
*, msg
, u32
, bytes
)
2207 msg
->cork_bytes
= bytes
;
2211 static const struct bpf_func_proto bpf_msg_cork_bytes_proto
= {
2212 .func
= bpf_msg_cork_bytes
,
2214 .ret_type
= RET_INTEGER
,
2215 .arg1_type
= ARG_PTR_TO_CTX
,
2216 .arg2_type
= ARG_ANYTHING
,
2219 BPF_CALL_4(bpf_msg_pull_data
, struct sk_msg
*, msg
, u32
, start
,
2220 u32
, end
, u64
, flags
)
2222 u32 len
= 0, offset
= 0, copy
= 0, poffset
= 0, bytes
= end
- start
;
2223 u32 first_sge
, last_sge
, i
, shift
, bytes_sg_total
;
2224 struct scatterlist
*sge
;
2225 u8
*raw
, *to
, *from
;
2228 if (unlikely(flags
|| end
<= start
))
2231 /* First find the starting scatterlist element */
2235 len
= sk_msg_elem(msg
, i
)->length
;
2236 if (start
< offset
+ len
)
2238 sk_msg_iter_var_next(i
);
2239 } while (i
!= msg
->sg
.end
);
2241 if (unlikely(start
>= offset
+ len
))
2245 /* The start may point into the sg element so we need to also
2246 * account for the headroom.
2248 bytes_sg_total
= start
- offset
+ bytes
;
2249 if (!test_bit(i
, &msg
->sg
.copy
) && bytes_sg_total
<= len
)
2252 /* At this point we need to linearize multiple scatterlist
2253 * elements or a single shared page. Either way we need to
2254 * copy into a linear buffer exclusively owned by BPF. Then
2255 * place the buffer in the scatterlist and fixup the original
2256 * entries by removing the entries now in the linear buffer
2257 * and shifting the remaining entries. For now we do not try
2258 * to copy partial entries to avoid complexity of running out
2259 * of sg_entry slots. The downside is reading a single byte
2260 * will copy the entire sg entry.
2263 copy
+= sk_msg_elem(msg
, i
)->length
;
2264 sk_msg_iter_var_next(i
);
2265 if (bytes_sg_total
<= copy
)
2267 } while (i
!= msg
->sg
.end
);
2270 if (unlikely(bytes_sg_total
> copy
))
2273 page
= alloc_pages(__GFP_NOWARN
| GFP_ATOMIC
| __GFP_COMP
,
2275 if (unlikely(!page
))
2278 raw
= page_address(page
);
2281 sge
= sk_msg_elem(msg
, i
);
2282 from
= sg_virt(sge
);
2286 memcpy(to
, from
, len
);
2289 put_page(sg_page(sge
));
2291 sk_msg_iter_var_next(i
);
2292 } while (i
!= last_sge
);
2294 sg_set_page(&msg
->sg
.data
[first_sge
], page
, copy
, 0);
2296 /* To repair sg ring we need to shift entries. If we only
2297 * had a single entry though we can just replace it and
2298 * be done. Otherwise walk the ring and shift the entries.
2300 WARN_ON_ONCE(last_sge
== first_sge
);
2301 shift
= last_sge
> first_sge
?
2302 last_sge
- first_sge
- 1 :
2303 NR_MSG_FRAG_IDS
- first_sge
+ last_sge
- 1;
2308 sk_msg_iter_var_next(i
);
2312 if (i
+ shift
>= NR_MSG_FRAG_IDS
)
2313 move_from
= i
+ shift
- NR_MSG_FRAG_IDS
;
2315 move_from
= i
+ shift
;
2316 if (move_from
== msg
->sg
.end
)
2319 msg
->sg
.data
[i
] = msg
->sg
.data
[move_from
];
2320 msg
->sg
.data
[move_from
].length
= 0;
2321 msg
->sg
.data
[move_from
].page_link
= 0;
2322 msg
->sg
.data
[move_from
].offset
= 0;
2323 sk_msg_iter_var_next(i
);
2326 msg
->sg
.end
= msg
->sg
.end
- shift
> msg
->sg
.end
?
2327 msg
->sg
.end
- shift
+ NR_MSG_FRAG_IDS
:
2328 msg
->sg
.end
- shift
;
2330 msg
->data
= sg_virt(&msg
->sg
.data
[first_sge
]) + start
- offset
;
2331 msg
->data_end
= msg
->data
+ bytes
;
2335 static const struct bpf_func_proto bpf_msg_pull_data_proto
= {
2336 .func
= bpf_msg_pull_data
,
2338 .ret_type
= RET_INTEGER
,
2339 .arg1_type
= ARG_PTR_TO_CTX
,
2340 .arg2_type
= ARG_ANYTHING
,
2341 .arg3_type
= ARG_ANYTHING
,
2342 .arg4_type
= ARG_ANYTHING
,
2345 BPF_CALL_4(bpf_msg_push_data
, struct sk_msg
*, msg
, u32
, start
,
2346 u32
, len
, u64
, flags
)
2348 struct scatterlist sge
, nsge
, nnsge
, rsge
= {0}, *psge
;
2349 u32
new, i
= 0, l
= 0, space
, copy
= 0, offset
= 0;
2350 u8
*raw
, *to
, *from
;
2353 if (unlikely(flags
))
2356 /* First find the starting scatterlist element */
2360 l
= sk_msg_elem(msg
, i
)->length
;
2362 if (start
< offset
+ l
)
2364 sk_msg_iter_var_next(i
);
2365 } while (i
!= msg
->sg
.end
);
2367 if (start
>= offset
+ l
)
2370 space
= MAX_MSG_FRAGS
- sk_msg_elem_used(msg
);
2372 /* If no space available will fallback to copy, we need at
2373 * least one scatterlist elem available to push data into
2374 * when start aligns to the beginning of an element or two
2375 * when it falls inside an element. We handle the start equals
2376 * offset case because its the common case for inserting a
2379 if (!space
|| (space
== 1 && start
!= offset
))
2380 copy
= msg
->sg
.data
[i
].length
;
2382 page
= alloc_pages(__GFP_NOWARN
| GFP_ATOMIC
| __GFP_COMP
,
2383 get_order(copy
+ len
));
2384 if (unlikely(!page
))
2390 raw
= page_address(page
);
2392 psge
= sk_msg_elem(msg
, i
);
2393 front
= start
- offset
;
2394 back
= psge
->length
- front
;
2395 from
= sg_virt(psge
);
2398 memcpy(raw
, from
, front
);
2402 to
= raw
+ front
+ len
;
2404 memcpy(to
, from
, back
);
2407 put_page(sg_page(psge
));
2408 } else if (start
- offset
) {
2409 psge
= sk_msg_elem(msg
, i
);
2410 rsge
= sk_msg_elem_cpy(msg
, i
);
2412 psge
->length
= start
- offset
;
2413 rsge
.length
-= psge
->length
;
2414 rsge
.offset
+= start
;
2416 sk_msg_iter_var_next(i
);
2417 sg_unmark_end(psge
);
2418 sg_unmark_end(&rsge
);
2419 sk_msg_iter_next(msg
, end
);
2422 /* Slot(s) to place newly allocated data */
2425 /* Shift one or two slots as needed */
2427 sge
= sk_msg_elem_cpy(msg
, i
);
2429 sk_msg_iter_var_next(i
);
2430 sg_unmark_end(&sge
);
2431 sk_msg_iter_next(msg
, end
);
2433 nsge
= sk_msg_elem_cpy(msg
, i
);
2435 sk_msg_iter_var_next(i
);
2436 nnsge
= sk_msg_elem_cpy(msg
, i
);
2439 while (i
!= msg
->sg
.end
) {
2440 msg
->sg
.data
[i
] = sge
;
2442 sk_msg_iter_var_next(i
);
2445 nnsge
= sk_msg_elem_cpy(msg
, i
);
2447 nsge
= sk_msg_elem_cpy(msg
, i
);
2452 /* Place newly allocated data buffer */
2453 sk_mem_charge(msg
->sk
, len
);
2454 msg
->sg
.size
+= len
;
2455 __clear_bit(new, &msg
->sg
.copy
);
2456 sg_set_page(&msg
->sg
.data
[new], page
, len
+ copy
, 0);
2458 get_page(sg_page(&rsge
));
2459 sk_msg_iter_var_next(new);
2460 msg
->sg
.data
[new] = rsge
;
2463 sk_msg_compute_data_pointers(msg
);
2467 static const struct bpf_func_proto bpf_msg_push_data_proto
= {
2468 .func
= bpf_msg_push_data
,
2470 .ret_type
= RET_INTEGER
,
2471 .arg1_type
= ARG_PTR_TO_CTX
,
2472 .arg2_type
= ARG_ANYTHING
,
2473 .arg3_type
= ARG_ANYTHING
,
2474 .arg4_type
= ARG_ANYTHING
,
2477 static void sk_msg_shift_left(struct sk_msg
*msg
, int i
)
2483 sk_msg_iter_var_next(i
);
2484 msg
->sg
.data
[prev
] = msg
->sg
.data
[i
];
2485 } while (i
!= msg
->sg
.end
);
2487 sk_msg_iter_prev(msg
, end
);
2490 static void sk_msg_shift_right(struct sk_msg
*msg
, int i
)
2492 struct scatterlist tmp
, sge
;
2494 sk_msg_iter_next(msg
, end
);
2495 sge
= sk_msg_elem_cpy(msg
, i
);
2496 sk_msg_iter_var_next(i
);
2497 tmp
= sk_msg_elem_cpy(msg
, i
);
2499 while (i
!= msg
->sg
.end
) {
2500 msg
->sg
.data
[i
] = sge
;
2501 sk_msg_iter_var_next(i
);
2503 tmp
= sk_msg_elem_cpy(msg
, i
);
2507 BPF_CALL_4(bpf_msg_pop_data
, struct sk_msg
*, msg
, u32
, start
,
2508 u32
, len
, u64
, flags
)
2510 u32 i
= 0, l
= 0, space
, offset
= 0;
2511 u64 last
= start
+ len
;
2514 if (unlikely(flags
))
2517 /* First find the starting scatterlist element */
2521 l
= sk_msg_elem(msg
, i
)->length
;
2523 if (start
< offset
+ l
)
2525 sk_msg_iter_var_next(i
);
2526 } while (i
!= msg
->sg
.end
);
2528 /* Bounds checks: start and pop must be inside message */
2529 if (start
>= offset
+ l
|| last
>= msg
->sg
.size
)
2532 space
= MAX_MSG_FRAGS
- sk_msg_elem_used(msg
);
2535 /* --------------| offset
2536 * -| start |-------- len -------|
2538 * |----- a ----|-------- pop -------|----- b ----|
2539 * |______________________________________________| length
2542 * a: region at front of scatter element to save
2543 * b: region at back of scatter element to save when length > A + pop
2544 * pop: region to pop from element, same as input 'pop' here will be
2545 * decremented below per iteration.
2547 * Two top-level cases to handle when start != offset, first B is non
2548 * zero and second B is zero corresponding to when a pop includes more
2551 * Then if B is non-zero AND there is no space allocate space and
2552 * compact A, B regions into page. If there is space shift ring to
2553 * the rigth free'ing the next element in ring to place B, leaving
2554 * A untouched except to reduce length.
2556 if (start
!= offset
) {
2557 struct scatterlist
*nsge
, *sge
= sk_msg_elem(msg
, i
);
2559 int b
= sge
->length
- pop
- a
;
2561 sk_msg_iter_var_next(i
);
2563 if (pop
< sge
->length
- a
) {
2566 sk_msg_shift_right(msg
, i
);
2567 nsge
= sk_msg_elem(msg
, i
);
2568 get_page(sg_page(sge
));
2571 b
, sge
->offset
+ pop
+ a
);
2573 struct page
*page
, *orig
;
2576 page
= alloc_pages(__GFP_NOWARN
|
2577 __GFP_COMP
| GFP_ATOMIC
,
2579 if (unlikely(!page
))
2583 orig
= sg_page(sge
);
2584 from
= sg_virt(sge
);
2585 to
= page_address(page
);
2586 memcpy(to
, from
, a
);
2587 memcpy(to
+ a
, from
+ a
+ pop
, b
);
2588 sg_set_page(sge
, page
, a
+ b
, 0);
2592 } else if (pop
>= sge
->length
- a
) {
2594 pop
-= (sge
->length
- a
);
2598 /* From above the current layout _must_ be as follows,
2603 * |---- pop ---|---------------- b ------------|
2604 * |____________________________________________| length
2606 * Offset and start of the current msg elem are equal because in the
2607 * previous case we handled offset != start and either consumed the
2608 * entire element and advanced to the next element OR pop == 0.
2610 * Two cases to handle here are first pop is less than the length
2611 * leaving some remainder b above. Simply adjust the element's layout
2612 * in this case. Or pop >= length of the element so that b = 0. In this
2613 * case advance to next element decrementing pop.
2616 struct scatterlist
*sge
= sk_msg_elem(msg
, i
);
2618 if (pop
< sge
->length
) {
2624 sk_msg_shift_left(msg
, i
);
2626 sk_msg_iter_var_next(i
);
2629 sk_mem_uncharge(msg
->sk
, len
- pop
);
2630 msg
->sg
.size
-= (len
- pop
);
2631 sk_msg_compute_data_pointers(msg
);
2635 static const struct bpf_func_proto bpf_msg_pop_data_proto
= {
2636 .func
= bpf_msg_pop_data
,
2638 .ret_type
= RET_INTEGER
,
2639 .arg1_type
= ARG_PTR_TO_CTX
,
2640 .arg2_type
= ARG_ANYTHING
,
2641 .arg3_type
= ARG_ANYTHING
,
2642 .arg4_type
= ARG_ANYTHING
,
2645 #ifdef CONFIG_CGROUP_NET_CLASSID
2646 BPF_CALL_0(bpf_get_cgroup_classid_curr
)
2648 return __task_get_classid(current
);
2651 static const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto
= {
2652 .func
= bpf_get_cgroup_classid_curr
,
2654 .ret_type
= RET_INTEGER
,
2658 BPF_CALL_1(bpf_get_cgroup_classid
, const struct sk_buff
*, skb
)
2660 return task_get_classid(skb
);
2663 static const struct bpf_func_proto bpf_get_cgroup_classid_proto
= {
2664 .func
= bpf_get_cgroup_classid
,
2666 .ret_type
= RET_INTEGER
,
2667 .arg1_type
= ARG_PTR_TO_CTX
,
2670 BPF_CALL_1(bpf_get_route_realm
, const struct sk_buff
*, skb
)
2672 return dst_tclassid(skb
);
2675 static const struct bpf_func_proto bpf_get_route_realm_proto
= {
2676 .func
= bpf_get_route_realm
,
2678 .ret_type
= RET_INTEGER
,
2679 .arg1_type
= ARG_PTR_TO_CTX
,
2682 BPF_CALL_1(bpf_get_hash_recalc
, struct sk_buff
*, skb
)
2684 /* If skb_clear_hash() was called due to mangling, we can
2685 * trigger SW recalculation here. Later access to hash
2686 * can then use the inline skb->hash via context directly
2687 * instead of calling this helper again.
2689 return skb_get_hash(skb
);
2692 static const struct bpf_func_proto bpf_get_hash_recalc_proto
= {
2693 .func
= bpf_get_hash_recalc
,
2695 .ret_type
= RET_INTEGER
,
2696 .arg1_type
= ARG_PTR_TO_CTX
,
2699 BPF_CALL_1(bpf_set_hash_invalid
, struct sk_buff
*, skb
)
2701 /* After all direct packet write, this can be used once for
2702 * triggering a lazy recalc on next skb_get_hash() invocation.
2704 skb_clear_hash(skb
);
2708 static const struct bpf_func_proto bpf_set_hash_invalid_proto
= {
2709 .func
= bpf_set_hash_invalid
,
2711 .ret_type
= RET_INTEGER
,
2712 .arg1_type
= ARG_PTR_TO_CTX
,
2715 BPF_CALL_2(bpf_set_hash
, struct sk_buff
*, skb
, u32
, hash
)
2717 /* Set user specified hash as L4(+), so that it gets returned
2718 * on skb_get_hash() call unless BPF prog later on triggers a
2721 __skb_set_sw_hash(skb
, hash
, true);
2725 static const struct bpf_func_proto bpf_set_hash_proto
= {
2726 .func
= bpf_set_hash
,
2728 .ret_type
= RET_INTEGER
,
2729 .arg1_type
= ARG_PTR_TO_CTX
,
2730 .arg2_type
= ARG_ANYTHING
,
2733 BPF_CALL_3(bpf_skb_vlan_push
, struct sk_buff
*, skb
, __be16
, vlan_proto
,
2738 if (unlikely(vlan_proto
!= htons(ETH_P_8021Q
) &&
2739 vlan_proto
!= htons(ETH_P_8021AD
)))
2740 vlan_proto
= htons(ETH_P_8021Q
);
2742 bpf_push_mac_rcsum(skb
);
2743 ret
= skb_vlan_push(skb
, vlan_proto
, vlan_tci
);
2744 bpf_pull_mac_rcsum(skb
);
2746 bpf_compute_data_pointers(skb
);
2750 static const struct bpf_func_proto bpf_skb_vlan_push_proto
= {
2751 .func
= bpf_skb_vlan_push
,
2753 .ret_type
= RET_INTEGER
,
2754 .arg1_type
= ARG_PTR_TO_CTX
,
2755 .arg2_type
= ARG_ANYTHING
,
2756 .arg3_type
= ARG_ANYTHING
,
2759 BPF_CALL_1(bpf_skb_vlan_pop
, struct sk_buff
*, skb
)
2763 bpf_push_mac_rcsum(skb
);
2764 ret
= skb_vlan_pop(skb
);
2765 bpf_pull_mac_rcsum(skb
);
2767 bpf_compute_data_pointers(skb
);
2771 static const struct bpf_func_proto bpf_skb_vlan_pop_proto
= {
2772 .func
= bpf_skb_vlan_pop
,
2774 .ret_type
= RET_INTEGER
,
2775 .arg1_type
= ARG_PTR_TO_CTX
,
2778 static int bpf_skb_generic_push(struct sk_buff
*skb
, u32 off
, u32 len
)
2780 /* Caller already did skb_cow() with len as headroom,
2781 * so no need to do it here.
2784 memmove(skb
->data
, skb
->data
+ len
, off
);
2785 memset(skb
->data
+ off
, 0, len
);
2787 /* No skb_postpush_rcsum(skb, skb->data + off, len)
2788 * needed here as it does not change the skb->csum
2789 * result for checksum complete when summing over
2795 static int bpf_skb_generic_pop(struct sk_buff
*skb
, u32 off
, u32 len
)
2797 /* skb_ensure_writable() is not needed here, as we're
2798 * already working on an uncloned skb.
2800 if (unlikely(!pskb_may_pull(skb
, off
+ len
)))
2803 skb_postpull_rcsum(skb
, skb
->data
+ off
, len
);
2804 memmove(skb
->data
+ len
, skb
->data
, off
);
2805 __skb_pull(skb
, len
);
2810 static int bpf_skb_net_hdr_push(struct sk_buff
*skb
, u32 off
, u32 len
)
2812 bool trans_same
= skb
->transport_header
== skb
->network_header
;
2815 /* There's no need for __skb_push()/__skb_pull() pair to
2816 * get to the start of the mac header as we're guaranteed
2817 * to always start from here under eBPF.
2819 ret
= bpf_skb_generic_push(skb
, off
, len
);
2821 skb
->mac_header
-= len
;
2822 skb
->network_header
-= len
;
2824 skb
->transport_header
= skb
->network_header
;
2830 static int bpf_skb_net_hdr_pop(struct sk_buff
*skb
, u32 off
, u32 len
)
2832 bool trans_same
= skb
->transport_header
== skb
->network_header
;
2835 /* Same here, __skb_push()/__skb_pull() pair not needed. */
2836 ret
= bpf_skb_generic_pop(skb
, off
, len
);
2838 skb
->mac_header
+= len
;
2839 skb
->network_header
+= len
;
2841 skb
->transport_header
= skb
->network_header
;
2847 static int bpf_skb_proto_4_to_6(struct sk_buff
*skb
)
2849 const u32 len_diff
= sizeof(struct ipv6hdr
) - sizeof(struct iphdr
);
2850 u32 off
= skb_mac_header_len(skb
);
2853 if (skb_is_gso(skb
) && !skb_is_gso_tcp(skb
))
2856 ret
= skb_cow(skb
, len_diff
);
2857 if (unlikely(ret
< 0))
2860 ret
= bpf_skb_net_hdr_push(skb
, off
, len_diff
);
2861 if (unlikely(ret
< 0))
2864 if (skb_is_gso(skb
)) {
2865 struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2867 /* SKB_GSO_TCPV4 needs to be changed into
2870 if (shinfo
->gso_type
& SKB_GSO_TCPV4
) {
2871 shinfo
->gso_type
&= ~SKB_GSO_TCPV4
;
2872 shinfo
->gso_type
|= SKB_GSO_TCPV6
;
2875 /* Due to IPv6 header, MSS needs to be downgraded. */
2876 skb_decrease_gso_size(shinfo
, len_diff
);
2877 /* Header must be checked, and gso_segs recomputed. */
2878 shinfo
->gso_type
|= SKB_GSO_DODGY
;
2879 shinfo
->gso_segs
= 0;
2882 skb
->protocol
= htons(ETH_P_IPV6
);
2883 skb_clear_hash(skb
);
2888 static int bpf_skb_proto_6_to_4(struct sk_buff
*skb
)
2890 const u32 len_diff
= sizeof(struct ipv6hdr
) - sizeof(struct iphdr
);
2891 u32 off
= skb_mac_header_len(skb
);
2894 if (skb_is_gso(skb
) && !skb_is_gso_tcp(skb
))
2897 ret
= skb_unclone(skb
, GFP_ATOMIC
);
2898 if (unlikely(ret
< 0))
2901 ret
= bpf_skb_net_hdr_pop(skb
, off
, len_diff
);
2902 if (unlikely(ret
< 0))
2905 if (skb_is_gso(skb
)) {
2906 struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2908 /* SKB_GSO_TCPV6 needs to be changed into
2911 if (shinfo
->gso_type
& SKB_GSO_TCPV6
) {
2912 shinfo
->gso_type
&= ~SKB_GSO_TCPV6
;
2913 shinfo
->gso_type
|= SKB_GSO_TCPV4
;
2916 /* Due to IPv4 header, MSS can be upgraded. */
2917 skb_increase_gso_size(shinfo
, len_diff
);
2918 /* Header must be checked, and gso_segs recomputed. */
2919 shinfo
->gso_type
|= SKB_GSO_DODGY
;
2920 shinfo
->gso_segs
= 0;
2923 skb
->protocol
= htons(ETH_P_IP
);
2924 skb_clear_hash(skb
);
2929 static int bpf_skb_proto_xlat(struct sk_buff
*skb
, __be16 to_proto
)
2931 __be16 from_proto
= skb
->protocol
;
2933 if (from_proto
== htons(ETH_P_IP
) &&
2934 to_proto
== htons(ETH_P_IPV6
))
2935 return bpf_skb_proto_4_to_6(skb
);
2937 if (from_proto
== htons(ETH_P_IPV6
) &&
2938 to_proto
== htons(ETH_P_IP
))
2939 return bpf_skb_proto_6_to_4(skb
);
2944 BPF_CALL_3(bpf_skb_change_proto
, struct sk_buff
*, skb
, __be16
, proto
,
2949 if (unlikely(flags
))
2952 /* General idea is that this helper does the basic groundwork
2953 * needed for changing the protocol, and eBPF program fills the
2954 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace()
2955 * and other helpers, rather than passing a raw buffer here.
2957 * The rationale is to keep this minimal and without a need to
2958 * deal with raw packet data. F.e. even if we would pass buffers
2959 * here, the program still needs to call the bpf_lX_csum_replace()
2960 * helpers anyway. Plus, this way we keep also separation of
2961 * concerns, since f.e. bpf_skb_store_bytes() should only take
2964 * Currently, additional options and extension header space are
2965 * not supported, but flags register is reserved so we can adapt
2966 * that. For offloads, we mark packet as dodgy, so that headers
2967 * need to be verified first.
2969 ret
= bpf_skb_proto_xlat(skb
, proto
);
2970 bpf_compute_data_pointers(skb
);
2974 static const struct bpf_func_proto bpf_skb_change_proto_proto
= {
2975 .func
= bpf_skb_change_proto
,
2977 .ret_type
= RET_INTEGER
,
2978 .arg1_type
= ARG_PTR_TO_CTX
,
2979 .arg2_type
= ARG_ANYTHING
,
2980 .arg3_type
= ARG_ANYTHING
,
2983 BPF_CALL_2(bpf_skb_change_type
, struct sk_buff
*, skb
, u32
, pkt_type
)
2985 /* We only allow a restricted subset to be changed for now. */
2986 if (unlikely(!skb_pkt_type_ok(skb
->pkt_type
) ||
2987 !skb_pkt_type_ok(pkt_type
)))
2990 skb
->pkt_type
= pkt_type
;
2994 static const struct bpf_func_proto bpf_skb_change_type_proto
= {
2995 .func
= bpf_skb_change_type
,
2997 .ret_type
= RET_INTEGER
,
2998 .arg1_type
= ARG_PTR_TO_CTX
,
2999 .arg2_type
= ARG_ANYTHING
,
3002 static u32
bpf_skb_net_base_len(const struct sk_buff
*skb
)
3004 switch (skb
->protocol
) {
3005 case htons(ETH_P_IP
):
3006 return sizeof(struct iphdr
);
3007 case htons(ETH_P_IPV6
):
3008 return sizeof(struct ipv6hdr
);
3014 #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \
3015 BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3017 #define BPF_F_ADJ_ROOM_MASK (BPF_F_ADJ_ROOM_FIXED_GSO | \
3018 BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \
3019 BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \
3020 BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \
3021 BPF_F_ADJ_ROOM_ENCAP_L2( \
3022 BPF_ADJ_ROOM_ENCAP_L2_MASK))
3024 static int bpf_skb_net_grow(struct sk_buff
*skb
, u32 off
, u32 len_diff
,
3027 u8 inner_mac_len
= flags
>> BPF_ADJ_ROOM_ENCAP_L2_SHIFT
;
3028 bool encap
= flags
& BPF_F_ADJ_ROOM_ENCAP_L3_MASK
;
3029 u16 mac_len
= 0, inner_net
= 0, inner_trans
= 0;
3030 unsigned int gso_type
= SKB_GSO_DODGY
;
3033 if (skb_is_gso(skb
) && !skb_is_gso_tcp(skb
)) {
3034 /* udp gso_size delineates datagrams, only allow if fixed */
3035 if (!(skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP_L4
) ||
3036 !(flags
& BPF_F_ADJ_ROOM_FIXED_GSO
))
3040 ret
= skb_cow_head(skb
, len_diff
);
3041 if (unlikely(ret
< 0))
3045 if (skb
->protocol
!= htons(ETH_P_IP
) &&
3046 skb
->protocol
!= htons(ETH_P_IPV6
))
3049 if (flags
& BPF_F_ADJ_ROOM_ENCAP_L3_IPV4
&&
3050 flags
& BPF_F_ADJ_ROOM_ENCAP_L3_IPV6
)
3053 if (flags
& BPF_F_ADJ_ROOM_ENCAP_L4_GRE
&&
3054 flags
& BPF_F_ADJ_ROOM_ENCAP_L4_UDP
)
3057 if (skb
->encapsulation
)
3060 mac_len
= skb
->network_header
- skb
->mac_header
;
3061 inner_net
= skb
->network_header
;
3062 if (inner_mac_len
> len_diff
)
3064 inner_trans
= skb
->transport_header
;
3067 ret
= bpf_skb_net_hdr_push(skb
, off
, len_diff
);
3068 if (unlikely(ret
< 0))
3072 skb
->inner_mac_header
= inner_net
- inner_mac_len
;
3073 skb
->inner_network_header
= inner_net
;
3074 skb
->inner_transport_header
= inner_trans
;
3075 skb_set_inner_protocol(skb
, skb
->protocol
);
3077 skb
->encapsulation
= 1;
3078 skb_set_network_header(skb
, mac_len
);
3080 if (flags
& BPF_F_ADJ_ROOM_ENCAP_L4_UDP
)
3081 gso_type
|= SKB_GSO_UDP_TUNNEL
;
3082 else if (flags
& BPF_F_ADJ_ROOM_ENCAP_L4_GRE
)
3083 gso_type
|= SKB_GSO_GRE
;
3084 else if (flags
& BPF_F_ADJ_ROOM_ENCAP_L3_IPV6
)
3085 gso_type
|= SKB_GSO_IPXIP6
;
3086 else if (flags
& BPF_F_ADJ_ROOM_ENCAP_L3_IPV4
)
3087 gso_type
|= SKB_GSO_IPXIP4
;
3089 if (flags
& BPF_F_ADJ_ROOM_ENCAP_L4_GRE
||
3090 flags
& BPF_F_ADJ_ROOM_ENCAP_L4_UDP
) {
3091 int nh_len
= flags
& BPF_F_ADJ_ROOM_ENCAP_L3_IPV6
?
3092 sizeof(struct ipv6hdr
) :
3093 sizeof(struct iphdr
);
3095 skb_set_transport_header(skb
, mac_len
+ nh_len
);
3098 /* Match skb->protocol to new outer l3 protocol */
3099 if (skb
->protocol
== htons(ETH_P_IP
) &&
3100 flags
& BPF_F_ADJ_ROOM_ENCAP_L3_IPV6
)
3101 skb
->protocol
= htons(ETH_P_IPV6
);
3102 else if (skb
->protocol
== htons(ETH_P_IPV6
) &&
3103 flags
& BPF_F_ADJ_ROOM_ENCAP_L3_IPV4
)
3104 skb
->protocol
= htons(ETH_P_IP
);
3107 if (skb_is_gso(skb
)) {
3108 struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
3110 /* Due to header grow, MSS needs to be downgraded. */
3111 if (!(flags
& BPF_F_ADJ_ROOM_FIXED_GSO
))
3112 skb_decrease_gso_size(shinfo
, len_diff
);
3114 /* Header must be checked, and gso_segs recomputed. */
3115 shinfo
->gso_type
|= gso_type
;
3116 shinfo
->gso_segs
= 0;
3122 static int bpf_skb_net_shrink(struct sk_buff
*skb
, u32 off
, u32 len_diff
,
3127 if (flags
& ~BPF_F_ADJ_ROOM_FIXED_GSO
)
3130 if (skb_is_gso(skb
) && !skb_is_gso_tcp(skb
)) {
3131 /* udp gso_size delineates datagrams, only allow if fixed */
3132 if (!(skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP_L4
) ||
3133 !(flags
& BPF_F_ADJ_ROOM_FIXED_GSO
))
3137 ret
= skb_unclone(skb
, GFP_ATOMIC
);
3138 if (unlikely(ret
< 0))
3141 ret
= bpf_skb_net_hdr_pop(skb
, off
, len_diff
);
3142 if (unlikely(ret
< 0))
3145 if (skb_is_gso(skb
)) {
3146 struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
3148 /* Due to header shrink, MSS can be upgraded. */
3149 if (!(flags
& BPF_F_ADJ_ROOM_FIXED_GSO
))
3150 skb_increase_gso_size(shinfo
, len_diff
);
3152 /* Header must be checked, and gso_segs recomputed. */
3153 shinfo
->gso_type
|= SKB_GSO_DODGY
;
3154 shinfo
->gso_segs
= 0;
3160 static u32
__bpf_skb_max_len(const struct sk_buff
*skb
)
3162 return skb
->dev
? skb
->dev
->mtu
+ skb
->dev
->hard_header_len
:
3166 BPF_CALL_4(bpf_skb_adjust_room
, struct sk_buff
*, skb
, s32
, len_diff
,
3167 u32
, mode
, u64
, flags
)
3169 u32 len_cur
, len_diff_abs
= abs(len_diff
);
3170 u32 len_min
= bpf_skb_net_base_len(skb
);
3171 u32 len_max
= __bpf_skb_max_len(skb
);
3172 __be16 proto
= skb
->protocol
;
3173 bool shrink
= len_diff
< 0;
3177 if (unlikely(flags
& ~BPF_F_ADJ_ROOM_MASK
))
3179 if (unlikely(len_diff_abs
> 0xfffU
))
3181 if (unlikely(proto
!= htons(ETH_P_IP
) &&
3182 proto
!= htons(ETH_P_IPV6
)))
3185 off
= skb_mac_header_len(skb
);
3187 case BPF_ADJ_ROOM_NET
:
3188 off
+= bpf_skb_net_base_len(skb
);
3190 case BPF_ADJ_ROOM_MAC
:
3196 len_cur
= skb
->len
- skb_network_offset(skb
);
3197 if ((shrink
&& (len_diff_abs
>= len_cur
||
3198 len_cur
- len_diff_abs
< len_min
)) ||
3199 (!shrink
&& (skb
->len
+ len_diff_abs
> len_max
&&
3203 ret
= shrink
? bpf_skb_net_shrink(skb
, off
, len_diff_abs
, flags
) :
3204 bpf_skb_net_grow(skb
, off
, len_diff_abs
, flags
);
3206 bpf_compute_data_pointers(skb
);
3210 static const struct bpf_func_proto bpf_skb_adjust_room_proto
= {
3211 .func
= bpf_skb_adjust_room
,
3213 .ret_type
= RET_INTEGER
,
3214 .arg1_type
= ARG_PTR_TO_CTX
,
3215 .arg2_type
= ARG_ANYTHING
,
3216 .arg3_type
= ARG_ANYTHING
,
3217 .arg4_type
= ARG_ANYTHING
,
3220 static u32
__bpf_skb_min_len(const struct sk_buff
*skb
)
3222 u32 min_len
= skb_network_offset(skb
);
3224 if (skb_transport_header_was_set(skb
))
3225 min_len
= skb_transport_offset(skb
);
3226 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
3227 min_len
= skb_checksum_start_offset(skb
) +
3228 skb
->csum_offset
+ sizeof(__sum16
);
3232 static int bpf_skb_grow_rcsum(struct sk_buff
*skb
, unsigned int new_len
)
3234 unsigned int old_len
= skb
->len
;
3237 ret
= __skb_grow_rcsum(skb
, new_len
);
3239 memset(skb
->data
+ old_len
, 0, new_len
- old_len
);
3243 static int bpf_skb_trim_rcsum(struct sk_buff
*skb
, unsigned int new_len
)
3245 return __skb_trim_rcsum(skb
, new_len
);
3248 static inline int __bpf_skb_change_tail(struct sk_buff
*skb
, u32 new_len
,
3251 u32 max_len
= __bpf_skb_max_len(skb
);
3252 u32 min_len
= __bpf_skb_min_len(skb
);
3255 if (unlikely(flags
|| new_len
> max_len
|| new_len
< min_len
))
3257 if (skb
->encapsulation
)
3260 /* The basic idea of this helper is that it's performing the
3261 * needed work to either grow or trim an skb, and eBPF program
3262 * rewrites the rest via helpers like bpf_skb_store_bytes(),
3263 * bpf_lX_csum_replace() and others rather than passing a raw
3264 * buffer here. This one is a slow path helper and intended
3265 * for replies with control messages.
3267 * Like in bpf_skb_change_proto(), we want to keep this rather
3268 * minimal and without protocol specifics so that we are able
3269 * to separate concerns as in bpf_skb_store_bytes() should only
3270 * be the one responsible for writing buffers.
3272 * It's really expected to be a slow path operation here for
3273 * control message replies, so we're implicitly linearizing,
3274 * uncloning and drop offloads from the skb by this.
3276 ret
= __bpf_try_make_writable(skb
, skb
->len
);
3278 if (new_len
> skb
->len
)
3279 ret
= bpf_skb_grow_rcsum(skb
, new_len
);
3280 else if (new_len
< skb
->len
)
3281 ret
= bpf_skb_trim_rcsum(skb
, new_len
);
3282 if (!ret
&& skb_is_gso(skb
))
3288 BPF_CALL_3(bpf_skb_change_tail
, struct sk_buff
*, skb
, u32
, new_len
,
3291 int ret
= __bpf_skb_change_tail(skb
, new_len
, flags
);
3293 bpf_compute_data_pointers(skb
);
3297 static const struct bpf_func_proto bpf_skb_change_tail_proto
= {
3298 .func
= bpf_skb_change_tail
,
3300 .ret_type
= RET_INTEGER
,
3301 .arg1_type
= ARG_PTR_TO_CTX
,
3302 .arg2_type
= ARG_ANYTHING
,
3303 .arg3_type
= ARG_ANYTHING
,
3306 BPF_CALL_3(sk_skb_change_tail
, struct sk_buff
*, skb
, u32
, new_len
,
3309 int ret
= __bpf_skb_change_tail(skb
, new_len
, flags
);
3311 bpf_compute_data_end_sk_skb(skb
);
3315 static const struct bpf_func_proto sk_skb_change_tail_proto
= {
3316 .func
= sk_skb_change_tail
,
3318 .ret_type
= RET_INTEGER
,
3319 .arg1_type
= ARG_PTR_TO_CTX
,
3320 .arg2_type
= ARG_ANYTHING
,
3321 .arg3_type
= ARG_ANYTHING
,
3324 static inline int __bpf_skb_change_head(struct sk_buff
*skb
, u32 head_room
,
3327 u32 max_len
= __bpf_skb_max_len(skb
);
3328 u32 new_len
= skb
->len
+ head_room
;
3331 if (unlikely(flags
|| (!skb_is_gso(skb
) && new_len
> max_len
) ||
3332 new_len
< skb
->len
))
3335 ret
= skb_cow(skb
, head_room
);
3337 /* Idea for this helper is that we currently only
3338 * allow to expand on mac header. This means that
3339 * skb->protocol network header, etc, stay as is.
3340 * Compared to bpf_skb_change_tail(), we're more
3341 * flexible due to not needing to linearize or
3342 * reset GSO. Intention for this helper is to be
3343 * used by an L3 skb that needs to push mac header
3344 * for redirection into L2 device.
3346 __skb_push(skb
, head_room
);
3347 memset(skb
->data
, 0, head_room
);
3348 skb_reset_mac_header(skb
);
3354 BPF_CALL_3(bpf_skb_change_head
, struct sk_buff
*, skb
, u32
, head_room
,
3357 int ret
= __bpf_skb_change_head(skb
, head_room
, flags
);
3359 bpf_compute_data_pointers(skb
);
3363 static const struct bpf_func_proto bpf_skb_change_head_proto
= {
3364 .func
= bpf_skb_change_head
,
3366 .ret_type
= RET_INTEGER
,
3367 .arg1_type
= ARG_PTR_TO_CTX
,
3368 .arg2_type
= ARG_ANYTHING
,
3369 .arg3_type
= ARG_ANYTHING
,
3372 BPF_CALL_3(sk_skb_change_head
, struct sk_buff
*, skb
, u32
, head_room
,
3375 int ret
= __bpf_skb_change_head(skb
, head_room
, flags
);
3377 bpf_compute_data_end_sk_skb(skb
);
3381 static const struct bpf_func_proto sk_skb_change_head_proto
= {
3382 .func
= sk_skb_change_head
,
3384 .ret_type
= RET_INTEGER
,
3385 .arg1_type
= ARG_PTR_TO_CTX
,
3386 .arg2_type
= ARG_ANYTHING
,
3387 .arg3_type
= ARG_ANYTHING
,
3389 static unsigned long xdp_get_metalen(const struct xdp_buff
*xdp
)
3391 return xdp_data_meta_unsupported(xdp
) ? 0 :
3392 xdp
->data
- xdp
->data_meta
;
3395 BPF_CALL_2(bpf_xdp_adjust_head
, struct xdp_buff
*, xdp
, int, offset
)
3397 void *xdp_frame_end
= xdp
->data_hard_start
+ sizeof(struct xdp_frame
);
3398 unsigned long metalen
= xdp_get_metalen(xdp
);
3399 void *data_start
= xdp_frame_end
+ metalen
;
3400 void *data
= xdp
->data
+ offset
;
3402 if (unlikely(data
< data_start
||
3403 data
> xdp
->data_end
- ETH_HLEN
))
3407 memmove(xdp
->data_meta
+ offset
,
3408 xdp
->data_meta
, metalen
);
3409 xdp
->data_meta
+= offset
;
3415 static const struct bpf_func_proto bpf_xdp_adjust_head_proto
= {
3416 .func
= bpf_xdp_adjust_head
,
3418 .ret_type
= RET_INTEGER
,
3419 .arg1_type
= ARG_PTR_TO_CTX
,
3420 .arg2_type
= ARG_ANYTHING
,
3423 BPF_CALL_2(bpf_xdp_adjust_tail
, struct xdp_buff
*, xdp
, int, offset
)
3425 void *data_end
= xdp
->data_end
+ offset
;
3427 /* only shrinking is allowed for now. */
3428 if (unlikely(offset
>= 0))
3431 if (unlikely(data_end
< xdp
->data
+ ETH_HLEN
))
3434 xdp
->data_end
= data_end
;
3439 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto
= {
3440 .func
= bpf_xdp_adjust_tail
,
3442 .ret_type
= RET_INTEGER
,
3443 .arg1_type
= ARG_PTR_TO_CTX
,
3444 .arg2_type
= ARG_ANYTHING
,
3447 BPF_CALL_2(bpf_xdp_adjust_meta
, struct xdp_buff
*, xdp
, int, offset
)
3449 void *xdp_frame_end
= xdp
->data_hard_start
+ sizeof(struct xdp_frame
);
3450 void *meta
= xdp
->data_meta
+ offset
;
3451 unsigned long metalen
= xdp
->data
- meta
;
3453 if (xdp_data_meta_unsupported(xdp
))
3455 if (unlikely(meta
< xdp_frame_end
||
3458 if (unlikely((metalen
& (sizeof(__u32
) - 1)) ||
3462 xdp
->data_meta
= meta
;
3467 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto
= {
3468 .func
= bpf_xdp_adjust_meta
,
3470 .ret_type
= RET_INTEGER
,
3471 .arg1_type
= ARG_PTR_TO_CTX
,
3472 .arg2_type
= ARG_ANYTHING
,
3475 static int __bpf_tx_xdp_map(struct net_device
*dev_rx
, void *fwd
,
3476 struct bpf_map
*map
, struct xdp_buff
*xdp
)
3478 switch (map
->map_type
) {
3479 case BPF_MAP_TYPE_DEVMAP
:
3480 case BPF_MAP_TYPE_DEVMAP_HASH
:
3481 return dev_map_enqueue(fwd
, xdp
, dev_rx
);
3482 case BPF_MAP_TYPE_CPUMAP
:
3483 return cpu_map_enqueue(fwd
, xdp
, dev_rx
);
3484 case BPF_MAP_TYPE_XSKMAP
:
3485 return __xsk_map_redirect(fwd
, xdp
);
3492 void xdp_do_flush(void)
3498 EXPORT_SYMBOL_GPL(xdp_do_flush
);
3500 static inline void *__xdp_map_lookup_elem(struct bpf_map
*map
, u32 index
)
3502 switch (map
->map_type
) {
3503 case BPF_MAP_TYPE_DEVMAP
:
3504 return __dev_map_lookup_elem(map
, index
);
3505 case BPF_MAP_TYPE_DEVMAP_HASH
:
3506 return __dev_map_hash_lookup_elem(map
, index
);
3507 case BPF_MAP_TYPE_CPUMAP
:
3508 return __cpu_map_lookup_elem(map
, index
);
3509 case BPF_MAP_TYPE_XSKMAP
:
3510 return __xsk_map_lookup_elem(map
, index
);
3516 void bpf_clear_redirect_map(struct bpf_map
*map
)
3518 struct bpf_redirect_info
*ri
;
3521 for_each_possible_cpu(cpu
) {
3522 ri
= per_cpu_ptr(&bpf_redirect_info
, cpu
);
3523 /* Avoid polluting remote cacheline due to writes if
3524 * not needed. Once we pass this test, we need the
3525 * cmpxchg() to make sure it hasn't been changed in
3526 * the meantime by remote CPU.
3528 if (unlikely(READ_ONCE(ri
->map
) == map
))
3529 cmpxchg(&ri
->map
, map
, NULL
);
3533 int xdp_do_redirect(struct net_device
*dev
, struct xdp_buff
*xdp
,
3534 struct bpf_prog
*xdp_prog
)
3536 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
3537 struct bpf_map
*map
= READ_ONCE(ri
->map
);
3538 u32 index
= ri
->tgt_index
;
3539 void *fwd
= ri
->tgt_value
;
3543 ri
->tgt_value
= NULL
;
3544 WRITE_ONCE(ri
->map
, NULL
);
3546 if (unlikely(!map
)) {
3547 fwd
= dev_get_by_index_rcu(dev_net(dev
), index
);
3548 if (unlikely(!fwd
)) {
3553 err
= dev_xdp_enqueue(fwd
, xdp
, dev
);
3555 err
= __bpf_tx_xdp_map(dev
, fwd
, map
, xdp
);
3561 _trace_xdp_redirect_map(dev
, xdp_prog
, fwd
, map
, index
);
3564 _trace_xdp_redirect_map_err(dev
, xdp_prog
, fwd
, map
, index
, err
);
3567 EXPORT_SYMBOL_GPL(xdp_do_redirect
);
3569 static int xdp_do_generic_redirect_map(struct net_device
*dev
,
3570 struct sk_buff
*skb
,
3571 struct xdp_buff
*xdp
,
3572 struct bpf_prog
*xdp_prog
,
3573 struct bpf_map
*map
)
3575 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
3576 u32 index
= ri
->tgt_index
;
3577 void *fwd
= ri
->tgt_value
;
3581 ri
->tgt_value
= NULL
;
3582 WRITE_ONCE(ri
->map
, NULL
);
3584 if (map
->map_type
== BPF_MAP_TYPE_DEVMAP
||
3585 map
->map_type
== BPF_MAP_TYPE_DEVMAP_HASH
) {
3586 struct bpf_dtab_netdev
*dst
= fwd
;
3588 err
= dev_map_generic_redirect(dst
, skb
, xdp_prog
);
3591 } else if (map
->map_type
== BPF_MAP_TYPE_XSKMAP
) {
3592 struct xdp_sock
*xs
= fwd
;
3594 err
= xsk_generic_rcv(xs
, xdp
);
3599 /* TODO: Handle BPF_MAP_TYPE_CPUMAP */
3604 _trace_xdp_redirect_map(dev
, xdp_prog
, fwd
, map
, index
);
3607 _trace_xdp_redirect_map_err(dev
, xdp_prog
, fwd
, map
, index
, err
);
3611 int xdp_do_generic_redirect(struct net_device
*dev
, struct sk_buff
*skb
,
3612 struct xdp_buff
*xdp
, struct bpf_prog
*xdp_prog
)
3614 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
3615 struct bpf_map
*map
= READ_ONCE(ri
->map
);
3616 u32 index
= ri
->tgt_index
;
3617 struct net_device
*fwd
;
3621 return xdp_do_generic_redirect_map(dev
, skb
, xdp
, xdp_prog
,
3624 fwd
= dev_get_by_index_rcu(dev_net(dev
), index
);
3625 if (unlikely(!fwd
)) {
3630 err
= xdp_ok_fwd_dev(fwd
, skb
->len
);
3635 _trace_xdp_redirect(dev
, xdp_prog
, index
);
3636 generic_xdp_tx(skb
, xdp_prog
);
3639 _trace_xdp_redirect_err(dev
, xdp_prog
, index
, err
);
3643 BPF_CALL_2(bpf_xdp_redirect
, u32
, ifindex
, u64
, flags
)
3645 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
3647 if (unlikely(flags
))
3651 ri
->tgt_index
= ifindex
;
3652 ri
->tgt_value
= NULL
;
3653 WRITE_ONCE(ri
->map
, NULL
);
3655 return XDP_REDIRECT
;
3658 static const struct bpf_func_proto bpf_xdp_redirect_proto
= {
3659 .func
= bpf_xdp_redirect
,
3661 .ret_type
= RET_INTEGER
,
3662 .arg1_type
= ARG_ANYTHING
,
3663 .arg2_type
= ARG_ANYTHING
,
3666 BPF_CALL_3(bpf_xdp_redirect_map
, struct bpf_map
*, map
, u32
, ifindex
,
3669 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
3671 /* Lower bits of the flags are used as return code on lookup failure */
3672 if (unlikely(flags
> XDP_TX
))
3675 ri
->tgt_value
= __xdp_map_lookup_elem(map
, ifindex
);
3676 if (unlikely(!ri
->tgt_value
)) {
3677 /* If the lookup fails we want to clear out the state in the
3678 * redirect_info struct completely, so that if an eBPF program
3679 * performs multiple lookups, the last one always takes
3682 WRITE_ONCE(ri
->map
, NULL
);
3687 ri
->tgt_index
= ifindex
;
3688 WRITE_ONCE(ri
->map
, map
);
3690 return XDP_REDIRECT
;
3693 static const struct bpf_func_proto bpf_xdp_redirect_map_proto
= {
3694 .func
= bpf_xdp_redirect_map
,
3696 .ret_type
= RET_INTEGER
,
3697 .arg1_type
= ARG_CONST_MAP_PTR
,
3698 .arg2_type
= ARG_ANYTHING
,
3699 .arg3_type
= ARG_ANYTHING
,
3702 static unsigned long bpf_skb_copy(void *dst_buff
, const void *skb
,
3703 unsigned long off
, unsigned long len
)
3705 void *ptr
= skb_header_pointer(skb
, off
, len
, dst_buff
);
3709 if (ptr
!= dst_buff
)
3710 memcpy(dst_buff
, ptr
, len
);
3715 BPF_CALL_5(bpf_skb_event_output
, struct sk_buff
*, skb
, struct bpf_map
*, map
,
3716 u64
, flags
, void *, meta
, u64
, meta_size
)
3718 u64 skb_size
= (flags
& BPF_F_CTXLEN_MASK
) >> 32;
3720 if (unlikely(flags
& ~(BPF_F_CTXLEN_MASK
| BPF_F_INDEX_MASK
)))
3722 if (unlikely(!skb
|| skb_size
> skb
->len
))
3725 return bpf_event_output(map
, flags
, meta
, meta_size
, skb
, skb_size
,
3729 static const struct bpf_func_proto bpf_skb_event_output_proto
= {
3730 .func
= bpf_skb_event_output
,
3732 .ret_type
= RET_INTEGER
,
3733 .arg1_type
= ARG_PTR_TO_CTX
,
3734 .arg2_type
= ARG_CONST_MAP_PTR
,
3735 .arg3_type
= ARG_ANYTHING
,
3736 .arg4_type
= ARG_PTR_TO_MEM
,
3737 .arg5_type
= ARG_CONST_SIZE_OR_ZERO
,
3740 static int bpf_skb_output_btf_ids
[5];
3741 const struct bpf_func_proto bpf_skb_output_proto
= {
3742 .func
= bpf_skb_event_output
,
3744 .ret_type
= RET_INTEGER
,
3745 .arg1_type
= ARG_PTR_TO_BTF_ID
,
3746 .arg2_type
= ARG_CONST_MAP_PTR
,
3747 .arg3_type
= ARG_ANYTHING
,
3748 .arg4_type
= ARG_PTR_TO_MEM
,
3749 .arg5_type
= ARG_CONST_SIZE_OR_ZERO
,
3750 .btf_id
= bpf_skb_output_btf_ids
,
3753 static unsigned short bpf_tunnel_key_af(u64 flags
)
3755 return flags
& BPF_F_TUNINFO_IPV6
? AF_INET6
: AF_INET
;
3758 BPF_CALL_4(bpf_skb_get_tunnel_key
, struct sk_buff
*, skb
, struct bpf_tunnel_key
*, to
,
3759 u32
, size
, u64
, flags
)
3761 const struct ip_tunnel_info
*info
= skb_tunnel_info(skb
);
3762 u8 compat
[sizeof(struct bpf_tunnel_key
)];
3766 if (unlikely(!info
|| (flags
& ~(BPF_F_TUNINFO_IPV6
)))) {
3770 if (ip_tunnel_info_af(info
) != bpf_tunnel_key_af(flags
)) {
3774 if (unlikely(size
!= sizeof(struct bpf_tunnel_key
))) {
3777 case offsetof(struct bpf_tunnel_key
, tunnel_label
):
3778 case offsetof(struct bpf_tunnel_key
, tunnel_ext
):
3780 case offsetof(struct bpf_tunnel_key
, remote_ipv6
[1]):
3781 /* Fixup deprecated structure layouts here, so we have
3782 * a common path later on.
3784 if (ip_tunnel_info_af(info
) != AF_INET
)
3787 to
= (struct bpf_tunnel_key
*)compat
;
3794 to
->tunnel_id
= be64_to_cpu(info
->key
.tun_id
);
3795 to
->tunnel_tos
= info
->key
.tos
;
3796 to
->tunnel_ttl
= info
->key
.ttl
;
3799 if (flags
& BPF_F_TUNINFO_IPV6
) {
3800 memcpy(to
->remote_ipv6
, &info
->key
.u
.ipv6
.src
,
3801 sizeof(to
->remote_ipv6
));
3802 to
->tunnel_label
= be32_to_cpu(info
->key
.label
);
3804 to
->remote_ipv4
= be32_to_cpu(info
->key
.u
.ipv4
.src
);
3805 memset(&to
->remote_ipv6
[1], 0, sizeof(__u32
) * 3);
3806 to
->tunnel_label
= 0;
3809 if (unlikely(size
!= sizeof(struct bpf_tunnel_key
)))
3810 memcpy(to_orig
, to
, size
);
3814 memset(to_orig
, 0, size
);
3818 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto
= {
3819 .func
= bpf_skb_get_tunnel_key
,
3821 .ret_type
= RET_INTEGER
,
3822 .arg1_type
= ARG_PTR_TO_CTX
,
3823 .arg2_type
= ARG_PTR_TO_UNINIT_MEM
,
3824 .arg3_type
= ARG_CONST_SIZE
,
3825 .arg4_type
= ARG_ANYTHING
,
3828 BPF_CALL_3(bpf_skb_get_tunnel_opt
, struct sk_buff
*, skb
, u8
*, to
, u32
, size
)
3830 const struct ip_tunnel_info
*info
= skb_tunnel_info(skb
);
3833 if (unlikely(!info
||
3834 !(info
->key
.tun_flags
& TUNNEL_OPTIONS_PRESENT
))) {
3838 if (unlikely(size
< info
->options_len
)) {
3843 ip_tunnel_info_opts_get(to
, info
);
3844 if (size
> info
->options_len
)
3845 memset(to
+ info
->options_len
, 0, size
- info
->options_len
);
3847 return info
->options_len
;
3849 memset(to
, 0, size
);
3853 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto
= {
3854 .func
= bpf_skb_get_tunnel_opt
,
3856 .ret_type
= RET_INTEGER
,
3857 .arg1_type
= ARG_PTR_TO_CTX
,
3858 .arg2_type
= ARG_PTR_TO_UNINIT_MEM
,
3859 .arg3_type
= ARG_CONST_SIZE
,
3862 static struct metadata_dst __percpu
*md_dst
;
3864 BPF_CALL_4(bpf_skb_set_tunnel_key
, struct sk_buff
*, skb
,
3865 const struct bpf_tunnel_key
*, from
, u32
, size
, u64
, flags
)
3867 struct metadata_dst
*md
= this_cpu_ptr(md_dst
);
3868 u8 compat
[sizeof(struct bpf_tunnel_key
)];
3869 struct ip_tunnel_info
*info
;
3871 if (unlikely(flags
& ~(BPF_F_TUNINFO_IPV6
| BPF_F_ZERO_CSUM_TX
|
3872 BPF_F_DONT_FRAGMENT
| BPF_F_SEQ_NUMBER
)))
3874 if (unlikely(size
!= sizeof(struct bpf_tunnel_key
))) {
3876 case offsetof(struct bpf_tunnel_key
, tunnel_label
):
3877 case offsetof(struct bpf_tunnel_key
, tunnel_ext
):
3878 case offsetof(struct bpf_tunnel_key
, remote_ipv6
[1]):
3879 /* Fixup deprecated structure layouts here, so we have
3880 * a common path later on.
3882 memcpy(compat
, from
, size
);
3883 memset(compat
+ size
, 0, sizeof(compat
) - size
);
3884 from
= (const struct bpf_tunnel_key
*) compat
;
3890 if (unlikely((!(flags
& BPF_F_TUNINFO_IPV6
) && from
->tunnel_label
) ||
3895 dst_hold((struct dst_entry
*) md
);
3896 skb_dst_set(skb
, (struct dst_entry
*) md
);
3898 info
= &md
->u
.tun_info
;
3899 memset(info
, 0, sizeof(*info
));
3900 info
->mode
= IP_TUNNEL_INFO_TX
;
3902 info
->key
.tun_flags
= TUNNEL_KEY
| TUNNEL_CSUM
| TUNNEL_NOCACHE
;
3903 if (flags
& BPF_F_DONT_FRAGMENT
)
3904 info
->key
.tun_flags
|= TUNNEL_DONT_FRAGMENT
;
3905 if (flags
& BPF_F_ZERO_CSUM_TX
)
3906 info
->key
.tun_flags
&= ~TUNNEL_CSUM
;
3907 if (flags
& BPF_F_SEQ_NUMBER
)
3908 info
->key
.tun_flags
|= TUNNEL_SEQ
;
3910 info
->key
.tun_id
= cpu_to_be64(from
->tunnel_id
);
3911 info
->key
.tos
= from
->tunnel_tos
;
3912 info
->key
.ttl
= from
->tunnel_ttl
;
3914 if (flags
& BPF_F_TUNINFO_IPV6
) {
3915 info
->mode
|= IP_TUNNEL_INFO_IPV6
;
3916 memcpy(&info
->key
.u
.ipv6
.dst
, from
->remote_ipv6
,
3917 sizeof(from
->remote_ipv6
));
3918 info
->key
.label
= cpu_to_be32(from
->tunnel_label
) &
3919 IPV6_FLOWLABEL_MASK
;
3921 info
->key
.u
.ipv4
.dst
= cpu_to_be32(from
->remote_ipv4
);
3927 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto
= {
3928 .func
= bpf_skb_set_tunnel_key
,
3930 .ret_type
= RET_INTEGER
,
3931 .arg1_type
= ARG_PTR_TO_CTX
,
3932 .arg2_type
= ARG_PTR_TO_MEM
,
3933 .arg3_type
= ARG_CONST_SIZE
,
3934 .arg4_type
= ARG_ANYTHING
,
3937 BPF_CALL_3(bpf_skb_set_tunnel_opt
, struct sk_buff
*, skb
,
3938 const u8
*, from
, u32
, size
)
3940 struct ip_tunnel_info
*info
= skb_tunnel_info(skb
);
3941 const struct metadata_dst
*md
= this_cpu_ptr(md_dst
);
3943 if (unlikely(info
!= &md
->u
.tun_info
|| (size
& (sizeof(u32
) - 1))))
3945 if (unlikely(size
> IP_TUNNEL_OPTS_MAX
))
3948 ip_tunnel_info_opts_set(info
, from
, size
, TUNNEL_OPTIONS_PRESENT
);
3953 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto
= {
3954 .func
= bpf_skb_set_tunnel_opt
,
3956 .ret_type
= RET_INTEGER
,
3957 .arg1_type
= ARG_PTR_TO_CTX
,
3958 .arg2_type
= ARG_PTR_TO_MEM
,
3959 .arg3_type
= ARG_CONST_SIZE
,
3962 static const struct bpf_func_proto
*
3963 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which
)
3966 struct metadata_dst __percpu
*tmp
;
3968 tmp
= metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX
,
3973 if (cmpxchg(&md_dst
, NULL
, tmp
))
3974 metadata_dst_free_percpu(tmp
);
3978 case BPF_FUNC_skb_set_tunnel_key
:
3979 return &bpf_skb_set_tunnel_key_proto
;
3980 case BPF_FUNC_skb_set_tunnel_opt
:
3981 return &bpf_skb_set_tunnel_opt_proto
;
3987 BPF_CALL_3(bpf_skb_under_cgroup
, struct sk_buff
*, skb
, struct bpf_map
*, map
,
3990 struct bpf_array
*array
= container_of(map
, struct bpf_array
, map
);
3991 struct cgroup
*cgrp
;
3994 sk
= skb_to_full_sk(skb
);
3995 if (!sk
|| !sk_fullsock(sk
))
3997 if (unlikely(idx
>= array
->map
.max_entries
))
4000 cgrp
= READ_ONCE(array
->ptrs
[idx
]);
4001 if (unlikely(!cgrp
))
4004 return sk_under_cgroup_hierarchy(sk
, cgrp
);
4007 static const struct bpf_func_proto bpf_skb_under_cgroup_proto
= {
4008 .func
= bpf_skb_under_cgroup
,
4010 .ret_type
= RET_INTEGER
,
4011 .arg1_type
= ARG_PTR_TO_CTX
,
4012 .arg2_type
= ARG_CONST_MAP_PTR
,
4013 .arg3_type
= ARG_ANYTHING
,
4016 #ifdef CONFIG_SOCK_CGROUP_DATA
4017 BPF_CALL_1(bpf_skb_cgroup_id
, const struct sk_buff
*, skb
)
4019 struct sock
*sk
= skb_to_full_sk(skb
);
4020 struct cgroup
*cgrp
;
4022 if (!sk
|| !sk_fullsock(sk
))
4025 cgrp
= sock_cgroup_ptr(&sk
->sk_cgrp_data
);
4026 return cgroup_id(cgrp
);
4029 static const struct bpf_func_proto bpf_skb_cgroup_id_proto
= {
4030 .func
= bpf_skb_cgroup_id
,
4032 .ret_type
= RET_INTEGER
,
4033 .arg1_type
= ARG_PTR_TO_CTX
,
4036 BPF_CALL_2(bpf_skb_ancestor_cgroup_id
, const struct sk_buff
*, skb
, int,
4039 struct sock
*sk
= skb_to_full_sk(skb
);
4040 struct cgroup
*ancestor
;
4041 struct cgroup
*cgrp
;
4043 if (!sk
|| !sk_fullsock(sk
))
4046 cgrp
= sock_cgroup_ptr(&sk
->sk_cgrp_data
);
4047 ancestor
= cgroup_ancestor(cgrp
, ancestor_level
);
4051 return cgroup_id(ancestor
);
4054 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto
= {
4055 .func
= bpf_skb_ancestor_cgroup_id
,
4057 .ret_type
= RET_INTEGER
,
4058 .arg1_type
= ARG_PTR_TO_CTX
,
4059 .arg2_type
= ARG_ANYTHING
,
4063 static unsigned long bpf_xdp_copy(void *dst_buff
, const void *src_buff
,
4064 unsigned long off
, unsigned long len
)
4066 memcpy(dst_buff
, src_buff
+ off
, len
);
4070 BPF_CALL_5(bpf_xdp_event_output
, struct xdp_buff
*, xdp
, struct bpf_map
*, map
,
4071 u64
, flags
, void *, meta
, u64
, meta_size
)
4073 u64 xdp_size
= (flags
& BPF_F_CTXLEN_MASK
) >> 32;
4075 if (unlikely(flags
& ~(BPF_F_CTXLEN_MASK
| BPF_F_INDEX_MASK
)))
4077 if (unlikely(!xdp
||
4078 xdp_size
> (unsigned long)(xdp
->data_end
- xdp
->data
)))
4081 return bpf_event_output(map
, flags
, meta
, meta_size
, xdp
->data
,
4082 xdp_size
, bpf_xdp_copy
);
4085 static const struct bpf_func_proto bpf_xdp_event_output_proto
= {
4086 .func
= bpf_xdp_event_output
,
4088 .ret_type
= RET_INTEGER
,
4089 .arg1_type
= ARG_PTR_TO_CTX
,
4090 .arg2_type
= ARG_CONST_MAP_PTR
,
4091 .arg3_type
= ARG_ANYTHING
,
4092 .arg4_type
= ARG_PTR_TO_MEM
,
4093 .arg5_type
= ARG_CONST_SIZE_OR_ZERO
,
4096 static int bpf_xdp_output_btf_ids
[5];
4097 const struct bpf_func_proto bpf_xdp_output_proto
= {
4098 .func
= bpf_xdp_event_output
,
4100 .ret_type
= RET_INTEGER
,
4101 .arg1_type
= ARG_PTR_TO_BTF_ID
,
4102 .arg2_type
= ARG_CONST_MAP_PTR
,
4103 .arg3_type
= ARG_ANYTHING
,
4104 .arg4_type
= ARG_PTR_TO_MEM
,
4105 .arg5_type
= ARG_CONST_SIZE_OR_ZERO
,
4106 .btf_id
= bpf_xdp_output_btf_ids
,
4109 BPF_CALL_1(bpf_get_socket_cookie
, struct sk_buff
*, skb
)
4111 return skb
->sk
? sock_gen_cookie(skb
->sk
) : 0;
4114 static const struct bpf_func_proto bpf_get_socket_cookie_proto
= {
4115 .func
= bpf_get_socket_cookie
,
4117 .ret_type
= RET_INTEGER
,
4118 .arg1_type
= ARG_PTR_TO_CTX
,
4121 BPF_CALL_1(bpf_get_socket_cookie_sock_addr
, struct bpf_sock_addr_kern
*, ctx
)
4123 return sock_gen_cookie(ctx
->sk
);
4126 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto
= {
4127 .func
= bpf_get_socket_cookie_sock_addr
,
4129 .ret_type
= RET_INTEGER
,
4130 .arg1_type
= ARG_PTR_TO_CTX
,
4133 BPF_CALL_1(bpf_get_socket_cookie_sock
, struct sock
*, ctx
)
4135 return sock_gen_cookie(ctx
);
4138 static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto
= {
4139 .func
= bpf_get_socket_cookie_sock
,
4141 .ret_type
= RET_INTEGER
,
4142 .arg1_type
= ARG_PTR_TO_CTX
,
4145 BPF_CALL_1(bpf_get_socket_cookie_sock_ops
, struct bpf_sock_ops_kern
*, ctx
)
4147 return sock_gen_cookie(ctx
->sk
);
4150 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto
= {
4151 .func
= bpf_get_socket_cookie_sock_ops
,
4153 .ret_type
= RET_INTEGER
,
4154 .arg1_type
= ARG_PTR_TO_CTX
,
4157 static u64
__bpf_get_netns_cookie(struct sock
*sk
)
4159 #ifdef CONFIG_NET_NS
4160 return net_gen_cookie(sk
? sk
->sk_net
.net
: &init_net
);
4166 BPF_CALL_1(bpf_get_netns_cookie_sock
, struct sock
*, ctx
)
4168 return __bpf_get_netns_cookie(ctx
);
4171 static const struct bpf_func_proto bpf_get_netns_cookie_sock_proto
= {
4172 .func
= bpf_get_netns_cookie_sock
,
4174 .ret_type
= RET_INTEGER
,
4175 .arg1_type
= ARG_PTR_TO_CTX_OR_NULL
,
4178 BPF_CALL_1(bpf_get_netns_cookie_sock_addr
, struct bpf_sock_addr_kern
*, ctx
)
4180 return __bpf_get_netns_cookie(ctx
? ctx
->sk
: NULL
);
4183 static const struct bpf_func_proto bpf_get_netns_cookie_sock_addr_proto
= {
4184 .func
= bpf_get_netns_cookie_sock_addr
,
4186 .ret_type
= RET_INTEGER
,
4187 .arg1_type
= ARG_PTR_TO_CTX_OR_NULL
,
4190 BPF_CALL_1(bpf_get_socket_uid
, struct sk_buff
*, skb
)
4192 struct sock
*sk
= sk_to_full_sk(skb
->sk
);
4195 if (!sk
|| !sk_fullsock(sk
))
4197 kuid
= sock_net_uid(sock_net(sk
), sk
);
4198 return from_kuid_munged(sock_net(sk
)->user_ns
, kuid
);
4201 static const struct bpf_func_proto bpf_get_socket_uid_proto
= {
4202 .func
= bpf_get_socket_uid
,
4204 .ret_type
= RET_INTEGER
,
4205 .arg1_type
= ARG_PTR_TO_CTX
,
4208 BPF_CALL_5(bpf_event_output_data
, void *, ctx
, struct bpf_map
*, map
, u64
, flags
,
4209 void *, data
, u64
, size
)
4211 if (unlikely(flags
& ~(BPF_F_INDEX_MASK
)))
4214 return bpf_event_output(map
, flags
, data
, size
, NULL
, 0, NULL
);
4217 static const struct bpf_func_proto bpf_event_output_data_proto
= {
4218 .func
= bpf_event_output_data
,
4220 .ret_type
= RET_INTEGER
,
4221 .arg1_type
= ARG_PTR_TO_CTX
,
4222 .arg2_type
= ARG_CONST_MAP_PTR
,
4223 .arg3_type
= ARG_ANYTHING
,
4224 .arg4_type
= ARG_PTR_TO_MEM
,
4225 .arg5_type
= ARG_CONST_SIZE_OR_ZERO
,
4228 BPF_CALL_5(bpf_setsockopt
, struct bpf_sock_ops_kern
*, bpf_sock
,
4229 int, level
, int, optname
, char *, optval
, int, optlen
)
4231 struct sock
*sk
= bpf_sock
->sk
;
4235 if (!sk_fullsock(sk
))
4238 if (level
== SOL_SOCKET
) {
4239 if (optlen
!= sizeof(int))
4241 val
= *((int *)optval
);
4243 /* Only some socketops are supported */
4246 val
= min_t(u32
, val
, sysctl_rmem_max
);
4247 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
4248 WRITE_ONCE(sk
->sk_rcvbuf
,
4249 max_t(int, val
* 2, SOCK_MIN_RCVBUF
));
4252 val
= min_t(u32
, val
, sysctl_wmem_max
);
4253 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
4254 WRITE_ONCE(sk
->sk_sndbuf
,
4255 max_t(int, val
* 2, SOCK_MIN_SNDBUF
));
4257 case SO_MAX_PACING_RATE
: /* 32bit version */
4259 cmpxchg(&sk
->sk_pacing_status
,
4262 sk
->sk_max_pacing_rate
= (val
== ~0U) ? ~0UL : val
;
4263 sk
->sk_pacing_rate
= min(sk
->sk_pacing_rate
,
4264 sk
->sk_max_pacing_rate
);
4267 sk
->sk_priority
= val
;
4272 WRITE_ONCE(sk
->sk_rcvlowat
, val
? : 1);
4275 if (sk
->sk_mark
!= val
) {
4284 } else if (level
== SOL_IP
) {
4285 if (optlen
!= sizeof(int) || sk
->sk_family
!= AF_INET
)
4288 val
= *((int *)optval
);
4289 /* Only some options are supported */
4292 if (val
< -1 || val
> 0xff) {
4295 struct inet_sock
*inet
= inet_sk(sk
);
4305 #if IS_ENABLED(CONFIG_IPV6)
4306 } else if (level
== SOL_IPV6
) {
4307 if (optlen
!= sizeof(int) || sk
->sk_family
!= AF_INET6
)
4310 val
= *((int *)optval
);
4311 /* Only some options are supported */
4314 if (val
< -1 || val
> 0xff) {
4317 struct ipv6_pinfo
*np
= inet6_sk(sk
);
4328 } else if (level
== SOL_TCP
&&
4329 sk
->sk_prot
->setsockopt
== tcp_setsockopt
) {
4330 if (optname
== TCP_CONGESTION
) {
4331 char name
[TCP_CA_NAME_MAX
];
4332 bool reinit
= bpf_sock
->op
> BPF_SOCK_OPS_NEEDS_ECN
;
4334 strncpy(name
, optval
, min_t(long, optlen
,
4335 TCP_CA_NAME_MAX
-1));
4336 name
[TCP_CA_NAME_MAX
-1] = 0;
4337 ret
= tcp_set_congestion_control(sk
, name
, false,
4340 struct tcp_sock
*tp
= tcp_sk(sk
);
4342 if (optlen
!= sizeof(int))
4345 val
= *((int *)optval
);
4346 /* Only some options are supported */
4349 if (val
<= 0 || tp
->data_segs_out
> tp
->syn_data
)
4354 case TCP_BPF_SNDCWND_CLAMP
:
4358 tp
->snd_cwnd_clamp
= val
;
4359 tp
->snd_ssthresh
= val
;
4363 if (val
< 0 || val
> 1)
4379 static const struct bpf_func_proto bpf_setsockopt_proto
= {
4380 .func
= bpf_setsockopt
,
4382 .ret_type
= RET_INTEGER
,
4383 .arg1_type
= ARG_PTR_TO_CTX
,
4384 .arg2_type
= ARG_ANYTHING
,
4385 .arg3_type
= ARG_ANYTHING
,
4386 .arg4_type
= ARG_PTR_TO_MEM
,
4387 .arg5_type
= ARG_CONST_SIZE
,
4390 BPF_CALL_5(bpf_getsockopt
, struct bpf_sock_ops_kern
*, bpf_sock
,
4391 int, level
, int, optname
, char *, optval
, int, optlen
)
4393 struct sock
*sk
= bpf_sock
->sk
;
4395 if (!sk_fullsock(sk
))
4398 if (level
== SOL_TCP
&& sk
->sk_prot
->getsockopt
== tcp_getsockopt
) {
4399 struct inet_connection_sock
*icsk
;
4400 struct tcp_sock
*tp
;
4403 case TCP_CONGESTION
:
4404 icsk
= inet_csk(sk
);
4406 if (!icsk
->icsk_ca_ops
|| optlen
<= 1)
4408 strncpy(optval
, icsk
->icsk_ca_ops
->name
, optlen
);
4409 optval
[optlen
- 1] = 0;
4414 if (optlen
<= 0 || !tp
->saved_syn
||
4415 optlen
> tp
->saved_syn
[0])
4417 memcpy(optval
, tp
->saved_syn
+ 1, optlen
);
4422 } else if (level
== SOL_IP
) {
4423 struct inet_sock
*inet
= inet_sk(sk
);
4425 if (optlen
!= sizeof(int) || sk
->sk_family
!= AF_INET
)
4428 /* Only some options are supported */
4431 *((int *)optval
) = (int)inet
->tos
;
4436 #if IS_ENABLED(CONFIG_IPV6)
4437 } else if (level
== SOL_IPV6
) {
4438 struct ipv6_pinfo
*np
= inet6_sk(sk
);
4440 if (optlen
!= sizeof(int) || sk
->sk_family
!= AF_INET6
)
4443 /* Only some options are supported */
4446 *((int *)optval
) = (int)np
->tclass
;
4458 memset(optval
, 0, optlen
);
4462 static const struct bpf_func_proto bpf_getsockopt_proto
= {
4463 .func
= bpf_getsockopt
,
4465 .ret_type
= RET_INTEGER
,
4466 .arg1_type
= ARG_PTR_TO_CTX
,
4467 .arg2_type
= ARG_ANYTHING
,
4468 .arg3_type
= ARG_ANYTHING
,
4469 .arg4_type
= ARG_PTR_TO_UNINIT_MEM
,
4470 .arg5_type
= ARG_CONST_SIZE
,
4473 BPF_CALL_2(bpf_sock_ops_cb_flags_set
, struct bpf_sock_ops_kern
*, bpf_sock
,
4476 struct sock
*sk
= bpf_sock
->sk
;
4477 int val
= argval
& BPF_SOCK_OPS_ALL_CB_FLAGS
;
4479 if (!IS_ENABLED(CONFIG_INET
) || !sk_fullsock(sk
))
4482 tcp_sk(sk
)->bpf_sock_ops_cb_flags
= val
;
4484 return argval
& (~BPF_SOCK_OPS_ALL_CB_FLAGS
);
4487 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto
= {
4488 .func
= bpf_sock_ops_cb_flags_set
,
4490 .ret_type
= RET_INTEGER
,
4491 .arg1_type
= ARG_PTR_TO_CTX
,
4492 .arg2_type
= ARG_ANYTHING
,
4495 const struct ipv6_bpf_stub
*ipv6_bpf_stub __read_mostly
;
4496 EXPORT_SYMBOL_GPL(ipv6_bpf_stub
);
4498 BPF_CALL_3(bpf_bind
, struct bpf_sock_addr_kern
*, ctx
, struct sockaddr
*, addr
,
4502 struct sock
*sk
= ctx
->sk
;
4505 /* Binding to port can be expensive so it's prohibited in the helper.
4506 * Only binding to IP is supported.
4509 if (addr_len
< offsetofend(struct sockaddr
, sa_family
))
4511 if (addr
->sa_family
== AF_INET
) {
4512 if (addr_len
< sizeof(struct sockaddr_in
))
4514 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
4516 return __inet_bind(sk
, addr
, addr_len
, true, false);
4517 #if IS_ENABLED(CONFIG_IPV6)
4518 } else if (addr
->sa_family
== AF_INET6
) {
4519 if (addr_len
< SIN6_LEN_RFC2133
)
4521 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
4523 /* ipv6_bpf_stub cannot be NULL, since it's called from
4524 * bpf_cgroup_inet6_connect hook and ipv6 is already loaded
4526 return ipv6_bpf_stub
->inet6_bind(sk
, addr
, addr_len
, true, false);
4527 #endif /* CONFIG_IPV6 */
4529 #endif /* CONFIG_INET */
4531 return -EAFNOSUPPORT
;
4534 static const struct bpf_func_proto bpf_bind_proto
= {
4537 .ret_type
= RET_INTEGER
,
4538 .arg1_type
= ARG_PTR_TO_CTX
,
4539 .arg2_type
= ARG_PTR_TO_MEM
,
4540 .arg3_type
= ARG_CONST_SIZE
,
4544 BPF_CALL_5(bpf_skb_get_xfrm_state
, struct sk_buff
*, skb
, u32
, index
,
4545 struct bpf_xfrm_state
*, to
, u32
, size
, u64
, flags
)
4547 const struct sec_path
*sp
= skb_sec_path(skb
);
4548 const struct xfrm_state
*x
;
4550 if (!sp
|| unlikely(index
>= sp
->len
|| flags
))
4553 x
= sp
->xvec
[index
];
4555 if (unlikely(size
!= sizeof(struct bpf_xfrm_state
)))
4558 to
->reqid
= x
->props
.reqid
;
4559 to
->spi
= x
->id
.spi
;
4560 to
->family
= x
->props
.family
;
4563 if (to
->family
== AF_INET6
) {
4564 memcpy(to
->remote_ipv6
, x
->props
.saddr
.a6
,
4565 sizeof(to
->remote_ipv6
));
4567 to
->remote_ipv4
= x
->props
.saddr
.a4
;
4568 memset(&to
->remote_ipv6
[1], 0, sizeof(__u32
) * 3);
4573 memset(to
, 0, size
);
4577 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto
= {
4578 .func
= bpf_skb_get_xfrm_state
,
4580 .ret_type
= RET_INTEGER
,
4581 .arg1_type
= ARG_PTR_TO_CTX
,
4582 .arg2_type
= ARG_ANYTHING
,
4583 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
4584 .arg4_type
= ARG_CONST_SIZE
,
4585 .arg5_type
= ARG_ANYTHING
,
4589 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6)
4590 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup
*params
,
4591 const struct neighbour
*neigh
,
4592 const struct net_device
*dev
)
4594 memcpy(params
->dmac
, neigh
->ha
, ETH_ALEN
);
4595 memcpy(params
->smac
, dev
->dev_addr
, ETH_ALEN
);
4596 params
->h_vlan_TCI
= 0;
4597 params
->h_vlan_proto
= 0;
4598 params
->ifindex
= dev
->ifindex
;
4604 #if IS_ENABLED(CONFIG_INET)
4605 static int bpf_ipv4_fib_lookup(struct net
*net
, struct bpf_fib_lookup
*params
,
4606 u32 flags
, bool check_mtu
)
4608 struct fib_nh_common
*nhc
;
4609 struct in_device
*in_dev
;
4610 struct neighbour
*neigh
;
4611 struct net_device
*dev
;
4612 struct fib_result res
;
4617 dev
= dev_get_by_index_rcu(net
, params
->ifindex
);
4621 /* verify forwarding is enabled on this interface */
4622 in_dev
= __in_dev_get_rcu(dev
);
4623 if (unlikely(!in_dev
|| !IN_DEV_FORWARD(in_dev
)))
4624 return BPF_FIB_LKUP_RET_FWD_DISABLED
;
4626 if (flags
& BPF_FIB_LOOKUP_OUTPUT
) {
4628 fl4
.flowi4_oif
= params
->ifindex
;
4630 fl4
.flowi4_iif
= params
->ifindex
;
4633 fl4
.flowi4_tos
= params
->tos
& IPTOS_RT_MASK
;
4634 fl4
.flowi4_scope
= RT_SCOPE_UNIVERSE
;
4635 fl4
.flowi4_flags
= 0;
4637 fl4
.flowi4_proto
= params
->l4_protocol
;
4638 fl4
.daddr
= params
->ipv4_dst
;
4639 fl4
.saddr
= params
->ipv4_src
;
4640 fl4
.fl4_sport
= params
->sport
;
4641 fl4
.fl4_dport
= params
->dport
;
4643 if (flags
& BPF_FIB_LOOKUP_DIRECT
) {
4644 u32 tbid
= l3mdev_fib_table_rcu(dev
) ? : RT_TABLE_MAIN
;
4645 struct fib_table
*tb
;
4647 tb
= fib_get_table(net
, tbid
);
4649 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4651 err
= fib_table_lookup(tb
, &fl4
, &res
, FIB_LOOKUP_NOREF
);
4653 fl4
.flowi4_mark
= 0;
4654 fl4
.flowi4_secid
= 0;
4655 fl4
.flowi4_tun_key
.tun_id
= 0;
4656 fl4
.flowi4_uid
= sock_net_uid(net
, NULL
);
4658 err
= fib_lookup(net
, &fl4
, &res
, FIB_LOOKUP_NOREF
);
4662 /* map fib lookup errors to RTN_ type */
4664 return BPF_FIB_LKUP_RET_BLACKHOLE
;
4665 if (err
== -EHOSTUNREACH
)
4666 return BPF_FIB_LKUP_RET_UNREACHABLE
;
4668 return BPF_FIB_LKUP_RET_PROHIBIT
;
4670 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4673 if (res
.type
!= RTN_UNICAST
)
4674 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4676 if (fib_info_num_path(res
.fi
) > 1)
4677 fib_select_path(net
, &res
, &fl4
, NULL
);
4680 mtu
= ip_mtu_from_fib_result(&res
, params
->ipv4_dst
);
4681 if (params
->tot_len
> mtu
)
4682 return BPF_FIB_LKUP_RET_FRAG_NEEDED
;
4687 /* do not handle lwt encaps right now */
4688 if (nhc
->nhc_lwtstate
)
4689 return BPF_FIB_LKUP_RET_UNSUPP_LWT
;
4693 params
->rt_metric
= res
.fi
->fib_priority
;
4695 /* xdp and cls_bpf programs are run in RCU-bh so
4696 * rcu_read_lock_bh is not needed here
4698 if (likely(nhc
->nhc_gw_family
!= AF_INET6
)) {
4699 if (nhc
->nhc_gw_family
)
4700 params
->ipv4_dst
= nhc
->nhc_gw
.ipv4
;
4702 neigh
= __ipv4_neigh_lookup_noref(dev
,
4703 (__force u32
)params
->ipv4_dst
);
4705 struct in6_addr
*dst
= (struct in6_addr
*)params
->ipv6_dst
;
4707 params
->family
= AF_INET6
;
4708 *dst
= nhc
->nhc_gw
.ipv6
;
4709 neigh
= __ipv6_neigh_lookup_noref_stub(dev
, dst
);
4713 return BPF_FIB_LKUP_RET_NO_NEIGH
;
4715 return bpf_fib_set_fwd_params(params
, neigh
, dev
);
4719 #if IS_ENABLED(CONFIG_IPV6)
4720 static int bpf_ipv6_fib_lookup(struct net
*net
, struct bpf_fib_lookup
*params
,
4721 u32 flags
, bool check_mtu
)
4723 struct in6_addr
*src
= (struct in6_addr
*) params
->ipv6_src
;
4724 struct in6_addr
*dst
= (struct in6_addr
*) params
->ipv6_dst
;
4725 struct fib6_result res
= {};
4726 struct neighbour
*neigh
;
4727 struct net_device
*dev
;
4728 struct inet6_dev
*idev
;
4734 /* link local addresses are never forwarded */
4735 if (rt6_need_strict(dst
) || rt6_need_strict(src
))
4736 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4738 dev
= dev_get_by_index_rcu(net
, params
->ifindex
);
4742 idev
= __in6_dev_get_safely(dev
);
4743 if (unlikely(!idev
|| !idev
->cnf
.forwarding
))
4744 return BPF_FIB_LKUP_RET_FWD_DISABLED
;
4746 if (flags
& BPF_FIB_LOOKUP_OUTPUT
) {
4748 oif
= fl6
.flowi6_oif
= params
->ifindex
;
4750 oif
= fl6
.flowi6_iif
= params
->ifindex
;
4752 strict
= RT6_LOOKUP_F_HAS_SADDR
;
4754 fl6
.flowlabel
= params
->flowinfo
;
4755 fl6
.flowi6_scope
= 0;
4756 fl6
.flowi6_flags
= 0;
4759 fl6
.flowi6_proto
= params
->l4_protocol
;
4762 fl6
.fl6_sport
= params
->sport
;
4763 fl6
.fl6_dport
= params
->dport
;
4765 if (flags
& BPF_FIB_LOOKUP_DIRECT
) {
4766 u32 tbid
= l3mdev_fib_table_rcu(dev
) ? : RT_TABLE_MAIN
;
4767 struct fib6_table
*tb
;
4769 tb
= ipv6_stub
->fib6_get_table(net
, tbid
);
4771 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4773 err
= ipv6_stub
->fib6_table_lookup(net
, tb
, oif
, &fl6
, &res
,
4776 fl6
.flowi6_mark
= 0;
4777 fl6
.flowi6_secid
= 0;
4778 fl6
.flowi6_tun_key
.tun_id
= 0;
4779 fl6
.flowi6_uid
= sock_net_uid(net
, NULL
);
4781 err
= ipv6_stub
->fib6_lookup(net
, oif
, &fl6
, &res
, strict
);
4784 if (unlikely(err
|| IS_ERR_OR_NULL(res
.f6i
) ||
4785 res
.f6i
== net
->ipv6
.fib6_null_entry
))
4786 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4788 switch (res
.fib6_type
) {
4789 /* only unicast is forwarded */
4793 return BPF_FIB_LKUP_RET_BLACKHOLE
;
4794 case RTN_UNREACHABLE
:
4795 return BPF_FIB_LKUP_RET_UNREACHABLE
;
4797 return BPF_FIB_LKUP_RET_PROHIBIT
;
4799 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4802 ipv6_stub
->fib6_select_path(net
, &res
, &fl6
, fl6
.flowi6_oif
,
4803 fl6
.flowi6_oif
!= 0, NULL
, strict
);
4806 mtu
= ipv6_stub
->ip6_mtu_from_fib6(&res
, dst
, src
);
4807 if (params
->tot_len
> mtu
)
4808 return BPF_FIB_LKUP_RET_FRAG_NEEDED
;
4811 if (res
.nh
->fib_nh_lws
)
4812 return BPF_FIB_LKUP_RET_UNSUPP_LWT
;
4814 if (res
.nh
->fib_nh_gw_family
)
4815 *dst
= res
.nh
->fib_nh_gw6
;
4817 dev
= res
.nh
->fib_nh_dev
;
4818 params
->rt_metric
= res
.f6i
->fib6_metric
;
4820 /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is
4823 neigh
= __ipv6_neigh_lookup_noref_stub(dev
, dst
);
4825 return BPF_FIB_LKUP_RET_NO_NEIGH
;
4827 return bpf_fib_set_fwd_params(params
, neigh
, dev
);
4831 BPF_CALL_4(bpf_xdp_fib_lookup
, struct xdp_buff
*, ctx
,
4832 struct bpf_fib_lookup
*, params
, int, plen
, u32
, flags
)
4834 if (plen
< sizeof(*params
))
4837 if (flags
& ~(BPF_FIB_LOOKUP_DIRECT
| BPF_FIB_LOOKUP_OUTPUT
))
4840 switch (params
->family
) {
4841 #if IS_ENABLED(CONFIG_INET)
4843 return bpf_ipv4_fib_lookup(dev_net(ctx
->rxq
->dev
), params
,
4846 #if IS_ENABLED(CONFIG_IPV6)
4848 return bpf_ipv6_fib_lookup(dev_net(ctx
->rxq
->dev
), params
,
4852 return -EAFNOSUPPORT
;
4855 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto
= {
4856 .func
= bpf_xdp_fib_lookup
,
4858 .ret_type
= RET_INTEGER
,
4859 .arg1_type
= ARG_PTR_TO_CTX
,
4860 .arg2_type
= ARG_PTR_TO_MEM
,
4861 .arg3_type
= ARG_CONST_SIZE
,
4862 .arg4_type
= ARG_ANYTHING
,
4865 BPF_CALL_4(bpf_skb_fib_lookup
, struct sk_buff
*, skb
,
4866 struct bpf_fib_lookup
*, params
, int, plen
, u32
, flags
)
4868 struct net
*net
= dev_net(skb
->dev
);
4869 int rc
= -EAFNOSUPPORT
;
4871 if (plen
< sizeof(*params
))
4874 if (flags
& ~(BPF_FIB_LOOKUP_DIRECT
| BPF_FIB_LOOKUP_OUTPUT
))
4877 switch (params
->family
) {
4878 #if IS_ENABLED(CONFIG_INET)
4880 rc
= bpf_ipv4_fib_lookup(net
, params
, flags
, false);
4883 #if IS_ENABLED(CONFIG_IPV6)
4885 rc
= bpf_ipv6_fib_lookup(net
, params
, flags
, false);
4891 struct net_device
*dev
;
4893 dev
= dev_get_by_index_rcu(net
, params
->ifindex
);
4894 if (!is_skb_forwardable(dev
, skb
))
4895 rc
= BPF_FIB_LKUP_RET_FRAG_NEEDED
;
4901 static const struct bpf_func_proto bpf_skb_fib_lookup_proto
= {
4902 .func
= bpf_skb_fib_lookup
,
4904 .ret_type
= RET_INTEGER
,
4905 .arg1_type
= ARG_PTR_TO_CTX
,
4906 .arg2_type
= ARG_PTR_TO_MEM
,
4907 .arg3_type
= ARG_CONST_SIZE
,
4908 .arg4_type
= ARG_ANYTHING
,
4911 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
4912 static int bpf_push_seg6_encap(struct sk_buff
*skb
, u32 type
, void *hdr
, u32 len
)
4915 struct ipv6_sr_hdr
*srh
= (struct ipv6_sr_hdr
*)hdr
;
4917 if (!seg6_validate_srh(srh
, len
))
4921 case BPF_LWT_ENCAP_SEG6_INLINE
:
4922 if (skb
->protocol
!= htons(ETH_P_IPV6
))
4925 err
= seg6_do_srh_inline(skb
, srh
);
4927 case BPF_LWT_ENCAP_SEG6
:
4928 skb_reset_inner_headers(skb
);
4929 skb
->encapsulation
= 1;
4930 err
= seg6_do_srh_encap(skb
, srh
, IPPROTO_IPV6
);
4936 bpf_compute_data_pointers(skb
);
4940 ipv6_hdr(skb
)->payload_len
= htons(skb
->len
- sizeof(struct ipv6hdr
));
4941 skb_set_transport_header(skb
, sizeof(struct ipv6hdr
));
4943 return seg6_lookup_nexthop(skb
, NULL
, 0);
4945 #endif /* CONFIG_IPV6_SEG6_BPF */
4947 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
4948 static int bpf_push_ip_encap(struct sk_buff
*skb
, void *hdr
, u32 len
,
4951 return bpf_lwt_push_ip_encap(skb
, hdr
, len
, ingress
);
4955 BPF_CALL_4(bpf_lwt_in_push_encap
, struct sk_buff
*, skb
, u32
, type
, void *, hdr
,
4959 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
4960 case BPF_LWT_ENCAP_SEG6
:
4961 case BPF_LWT_ENCAP_SEG6_INLINE
:
4962 return bpf_push_seg6_encap(skb
, type
, hdr
, len
);
4964 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
4965 case BPF_LWT_ENCAP_IP
:
4966 return bpf_push_ip_encap(skb
, hdr
, len
, true /* ingress */);
4973 BPF_CALL_4(bpf_lwt_xmit_push_encap
, struct sk_buff
*, skb
, u32
, type
,
4974 void *, hdr
, u32
, len
)
4977 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
4978 case BPF_LWT_ENCAP_IP
:
4979 return bpf_push_ip_encap(skb
, hdr
, len
, false /* egress */);
4986 static const struct bpf_func_proto bpf_lwt_in_push_encap_proto
= {
4987 .func
= bpf_lwt_in_push_encap
,
4989 .ret_type
= RET_INTEGER
,
4990 .arg1_type
= ARG_PTR_TO_CTX
,
4991 .arg2_type
= ARG_ANYTHING
,
4992 .arg3_type
= ARG_PTR_TO_MEM
,
4993 .arg4_type
= ARG_CONST_SIZE
4996 static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto
= {
4997 .func
= bpf_lwt_xmit_push_encap
,
4999 .ret_type
= RET_INTEGER
,
5000 .arg1_type
= ARG_PTR_TO_CTX
,
5001 .arg2_type
= ARG_ANYTHING
,
5002 .arg3_type
= ARG_PTR_TO_MEM
,
5003 .arg4_type
= ARG_CONST_SIZE
5006 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
5007 BPF_CALL_4(bpf_lwt_seg6_store_bytes
, struct sk_buff
*, skb
, u32
, offset
,
5008 const void *, from
, u32
, len
)
5010 struct seg6_bpf_srh_state
*srh_state
=
5011 this_cpu_ptr(&seg6_bpf_srh_states
);
5012 struct ipv6_sr_hdr
*srh
= srh_state
->srh
;
5013 void *srh_tlvs
, *srh_end
, *ptr
;
5019 srh_tlvs
= (void *)((char *)srh
+ ((srh
->first_segment
+ 1) << 4));
5020 srh_end
= (void *)((char *)srh
+ sizeof(*srh
) + srh_state
->hdrlen
);
5022 ptr
= skb
->data
+ offset
;
5023 if (ptr
>= srh_tlvs
&& ptr
+ len
<= srh_end
)
5024 srh_state
->valid
= false;
5025 else if (ptr
< (void *)&srh
->flags
||
5026 ptr
+ len
> (void *)&srh
->segments
)
5029 if (unlikely(bpf_try_make_writable(skb
, offset
+ len
)))
5031 if (ipv6_find_hdr(skb
, &srhoff
, IPPROTO_ROUTING
, NULL
, NULL
) < 0)
5033 srh_state
->srh
= (struct ipv6_sr_hdr
*)(skb
->data
+ srhoff
);
5035 memcpy(skb
->data
+ offset
, from
, len
);
5039 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto
= {
5040 .func
= bpf_lwt_seg6_store_bytes
,
5042 .ret_type
= RET_INTEGER
,
5043 .arg1_type
= ARG_PTR_TO_CTX
,
5044 .arg2_type
= ARG_ANYTHING
,
5045 .arg3_type
= ARG_PTR_TO_MEM
,
5046 .arg4_type
= ARG_CONST_SIZE
5049 static void bpf_update_srh_state(struct sk_buff
*skb
)
5051 struct seg6_bpf_srh_state
*srh_state
=
5052 this_cpu_ptr(&seg6_bpf_srh_states
);
5055 if (ipv6_find_hdr(skb
, &srhoff
, IPPROTO_ROUTING
, NULL
, NULL
) < 0) {
5056 srh_state
->srh
= NULL
;
5058 srh_state
->srh
= (struct ipv6_sr_hdr
*)(skb
->data
+ srhoff
);
5059 srh_state
->hdrlen
= srh_state
->srh
->hdrlen
<< 3;
5060 srh_state
->valid
= true;
5064 BPF_CALL_4(bpf_lwt_seg6_action
, struct sk_buff
*, skb
,
5065 u32
, action
, void *, param
, u32
, param_len
)
5067 struct seg6_bpf_srh_state
*srh_state
=
5068 this_cpu_ptr(&seg6_bpf_srh_states
);
5073 case SEG6_LOCAL_ACTION_END_X
:
5074 if (!seg6_bpf_has_valid_srh(skb
))
5076 if (param_len
!= sizeof(struct in6_addr
))
5078 return seg6_lookup_nexthop(skb
, (struct in6_addr
*)param
, 0);
5079 case SEG6_LOCAL_ACTION_END_T
:
5080 if (!seg6_bpf_has_valid_srh(skb
))
5082 if (param_len
!= sizeof(int))
5084 return seg6_lookup_nexthop(skb
, NULL
, *(int *)param
);
5085 case SEG6_LOCAL_ACTION_END_DT6
:
5086 if (!seg6_bpf_has_valid_srh(skb
))
5088 if (param_len
!= sizeof(int))
5091 if (ipv6_find_hdr(skb
, &hdroff
, IPPROTO_IPV6
, NULL
, NULL
) < 0)
5093 if (!pskb_pull(skb
, hdroff
))
5096 skb_postpull_rcsum(skb
, skb_network_header(skb
), hdroff
);
5097 skb_reset_network_header(skb
);
5098 skb_reset_transport_header(skb
);
5099 skb
->encapsulation
= 0;
5101 bpf_compute_data_pointers(skb
);
5102 bpf_update_srh_state(skb
);
5103 return seg6_lookup_nexthop(skb
, NULL
, *(int *)param
);
5104 case SEG6_LOCAL_ACTION_END_B6
:
5105 if (srh_state
->srh
&& !seg6_bpf_has_valid_srh(skb
))
5107 err
= bpf_push_seg6_encap(skb
, BPF_LWT_ENCAP_SEG6_INLINE
,
5110 bpf_update_srh_state(skb
);
5113 case SEG6_LOCAL_ACTION_END_B6_ENCAP
:
5114 if (srh_state
->srh
&& !seg6_bpf_has_valid_srh(skb
))
5116 err
= bpf_push_seg6_encap(skb
, BPF_LWT_ENCAP_SEG6
,
5119 bpf_update_srh_state(skb
);
5127 static const struct bpf_func_proto bpf_lwt_seg6_action_proto
= {
5128 .func
= bpf_lwt_seg6_action
,
5130 .ret_type
= RET_INTEGER
,
5131 .arg1_type
= ARG_PTR_TO_CTX
,
5132 .arg2_type
= ARG_ANYTHING
,
5133 .arg3_type
= ARG_PTR_TO_MEM
,
5134 .arg4_type
= ARG_CONST_SIZE
5137 BPF_CALL_3(bpf_lwt_seg6_adjust_srh
, struct sk_buff
*, skb
, u32
, offset
,
5140 struct seg6_bpf_srh_state
*srh_state
=
5141 this_cpu_ptr(&seg6_bpf_srh_states
);
5142 struct ipv6_sr_hdr
*srh
= srh_state
->srh
;
5143 void *srh_end
, *srh_tlvs
, *ptr
;
5144 struct ipv6hdr
*hdr
;
5148 if (unlikely(srh
== NULL
))
5151 srh_tlvs
= (void *)((unsigned char *)srh
+ sizeof(*srh
) +
5152 ((srh
->first_segment
+ 1) << 4));
5153 srh_end
= (void *)((unsigned char *)srh
+ sizeof(*srh
) +
5155 ptr
= skb
->data
+ offset
;
5157 if (unlikely(ptr
< srh_tlvs
|| ptr
> srh_end
))
5159 if (unlikely(len
< 0 && (void *)((char *)ptr
- len
) > srh_end
))
5163 ret
= skb_cow_head(skb
, len
);
5164 if (unlikely(ret
< 0))
5167 ret
= bpf_skb_net_hdr_push(skb
, offset
, len
);
5169 ret
= bpf_skb_net_hdr_pop(skb
, offset
, -1 * len
);
5172 bpf_compute_data_pointers(skb
);
5173 if (unlikely(ret
< 0))
5176 hdr
= (struct ipv6hdr
*)skb
->data
;
5177 hdr
->payload_len
= htons(skb
->len
- sizeof(struct ipv6hdr
));
5179 if (ipv6_find_hdr(skb
, &srhoff
, IPPROTO_ROUTING
, NULL
, NULL
) < 0)
5181 srh_state
->srh
= (struct ipv6_sr_hdr
*)(skb
->data
+ srhoff
);
5182 srh_state
->hdrlen
+= len
;
5183 srh_state
->valid
= false;
5187 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto
= {
5188 .func
= bpf_lwt_seg6_adjust_srh
,
5190 .ret_type
= RET_INTEGER
,
5191 .arg1_type
= ARG_PTR_TO_CTX
,
5192 .arg2_type
= ARG_ANYTHING
,
5193 .arg3_type
= ARG_ANYTHING
,
5195 #endif /* CONFIG_IPV6_SEG6_BPF */
5198 static struct sock
*sk_lookup(struct net
*net
, struct bpf_sock_tuple
*tuple
,
5199 int dif
, int sdif
, u8 family
, u8 proto
)
5201 bool refcounted
= false;
5202 struct sock
*sk
= NULL
;
5204 if (family
== AF_INET
) {
5205 __be32 src4
= tuple
->ipv4
.saddr
;
5206 __be32 dst4
= tuple
->ipv4
.daddr
;
5208 if (proto
== IPPROTO_TCP
)
5209 sk
= __inet_lookup(net
, &tcp_hashinfo
, NULL
, 0,
5210 src4
, tuple
->ipv4
.sport
,
5211 dst4
, tuple
->ipv4
.dport
,
5212 dif
, sdif
, &refcounted
);
5214 sk
= __udp4_lib_lookup(net
, src4
, tuple
->ipv4
.sport
,
5215 dst4
, tuple
->ipv4
.dport
,
5216 dif
, sdif
, &udp_table
, NULL
);
5217 #if IS_ENABLED(CONFIG_IPV6)
5219 struct in6_addr
*src6
= (struct in6_addr
*)&tuple
->ipv6
.saddr
;
5220 struct in6_addr
*dst6
= (struct in6_addr
*)&tuple
->ipv6
.daddr
;
5222 if (proto
== IPPROTO_TCP
)
5223 sk
= __inet6_lookup(net
, &tcp_hashinfo
, NULL
, 0,
5224 src6
, tuple
->ipv6
.sport
,
5225 dst6
, ntohs(tuple
->ipv6
.dport
),
5226 dif
, sdif
, &refcounted
);
5227 else if (likely(ipv6_bpf_stub
))
5228 sk
= ipv6_bpf_stub
->udp6_lib_lookup(net
,
5229 src6
, tuple
->ipv6
.sport
,
5230 dst6
, tuple
->ipv6
.dport
,
5236 if (unlikely(sk
&& !refcounted
&& !sock_flag(sk
, SOCK_RCU_FREE
))) {
5237 WARN_ONCE(1, "Found non-RCU, unreferenced socket!");
5243 /* bpf_skc_lookup performs the core lookup for different types of sockets,
5244 * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE.
5245 * Returns the socket as an 'unsigned long' to simplify the casting in the
5246 * callers to satisfy BPF_CALL declarations.
5248 static struct sock
*
5249 __bpf_skc_lookup(struct sk_buff
*skb
, struct bpf_sock_tuple
*tuple
, u32 len
,
5250 struct net
*caller_net
, u32 ifindex
, u8 proto
, u64 netns_id
,
5253 struct sock
*sk
= NULL
;
5254 u8 family
= AF_UNSPEC
;
5258 if (len
== sizeof(tuple
->ipv4
))
5260 else if (len
== sizeof(tuple
->ipv6
))
5265 if (unlikely(family
== AF_UNSPEC
|| flags
||
5266 !((s32
)netns_id
< 0 || netns_id
<= S32_MAX
)))
5269 if (family
== AF_INET
)
5270 sdif
= inet_sdif(skb
);
5272 sdif
= inet6_sdif(skb
);
5274 if ((s32
)netns_id
< 0) {
5276 sk
= sk_lookup(net
, tuple
, ifindex
, sdif
, family
, proto
);
5278 net
= get_net_ns_by_id(caller_net
, netns_id
);
5281 sk
= sk_lookup(net
, tuple
, ifindex
, sdif
, family
, proto
);
5289 static struct sock
*
5290 __bpf_sk_lookup(struct sk_buff
*skb
, struct bpf_sock_tuple
*tuple
, u32 len
,
5291 struct net
*caller_net
, u32 ifindex
, u8 proto
, u64 netns_id
,
5294 struct sock
*sk
= __bpf_skc_lookup(skb
, tuple
, len
, caller_net
,
5295 ifindex
, proto
, netns_id
, flags
);
5298 sk
= sk_to_full_sk(sk
);
5299 if (!sk_fullsock(sk
)) {
5308 static struct sock
*
5309 bpf_skc_lookup(struct sk_buff
*skb
, struct bpf_sock_tuple
*tuple
, u32 len
,
5310 u8 proto
, u64 netns_id
, u64 flags
)
5312 struct net
*caller_net
;
5316 caller_net
= dev_net(skb
->dev
);
5317 ifindex
= skb
->dev
->ifindex
;
5319 caller_net
= sock_net(skb
->sk
);
5323 return __bpf_skc_lookup(skb
, tuple
, len
, caller_net
, ifindex
, proto
,
5327 static struct sock
*
5328 bpf_sk_lookup(struct sk_buff
*skb
, struct bpf_sock_tuple
*tuple
, u32 len
,
5329 u8 proto
, u64 netns_id
, u64 flags
)
5331 struct sock
*sk
= bpf_skc_lookup(skb
, tuple
, len
, proto
, netns_id
,
5335 sk
= sk_to_full_sk(sk
);
5336 if (!sk_fullsock(sk
)) {
5345 BPF_CALL_5(bpf_skc_lookup_tcp
, struct sk_buff
*, skb
,
5346 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
5348 return (unsigned long)bpf_skc_lookup(skb
, tuple
, len
, IPPROTO_TCP
,
5352 static const struct bpf_func_proto bpf_skc_lookup_tcp_proto
= {
5353 .func
= bpf_skc_lookup_tcp
,
5356 .ret_type
= RET_PTR_TO_SOCK_COMMON_OR_NULL
,
5357 .arg1_type
= ARG_PTR_TO_CTX
,
5358 .arg2_type
= ARG_PTR_TO_MEM
,
5359 .arg3_type
= ARG_CONST_SIZE
,
5360 .arg4_type
= ARG_ANYTHING
,
5361 .arg5_type
= ARG_ANYTHING
,
5364 BPF_CALL_5(bpf_sk_lookup_tcp
, struct sk_buff
*, skb
,
5365 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
5367 return (unsigned long)bpf_sk_lookup(skb
, tuple
, len
, IPPROTO_TCP
,
5371 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto
= {
5372 .func
= bpf_sk_lookup_tcp
,
5375 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
5376 .arg1_type
= ARG_PTR_TO_CTX
,
5377 .arg2_type
= ARG_PTR_TO_MEM
,
5378 .arg3_type
= ARG_CONST_SIZE
,
5379 .arg4_type
= ARG_ANYTHING
,
5380 .arg5_type
= ARG_ANYTHING
,
5383 BPF_CALL_5(bpf_sk_lookup_udp
, struct sk_buff
*, skb
,
5384 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
5386 return (unsigned long)bpf_sk_lookup(skb
, tuple
, len
, IPPROTO_UDP
,
5390 static const struct bpf_func_proto bpf_sk_lookup_udp_proto
= {
5391 .func
= bpf_sk_lookup_udp
,
5394 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
5395 .arg1_type
= ARG_PTR_TO_CTX
,
5396 .arg2_type
= ARG_PTR_TO_MEM
,
5397 .arg3_type
= ARG_CONST_SIZE
,
5398 .arg4_type
= ARG_ANYTHING
,
5399 .arg5_type
= ARG_ANYTHING
,
5402 BPF_CALL_1(bpf_sk_release
, struct sock
*, sk
)
5404 if (sk_is_refcounted(sk
))
5409 static const struct bpf_func_proto bpf_sk_release_proto
= {
5410 .func
= bpf_sk_release
,
5412 .ret_type
= RET_INTEGER
,
5413 .arg1_type
= ARG_PTR_TO_SOCK_COMMON
,
5416 BPF_CALL_5(bpf_xdp_sk_lookup_udp
, struct xdp_buff
*, ctx
,
5417 struct bpf_sock_tuple
*, tuple
, u32
, len
, u32
, netns_id
, u64
, flags
)
5419 struct net
*caller_net
= dev_net(ctx
->rxq
->dev
);
5420 int ifindex
= ctx
->rxq
->dev
->ifindex
;
5422 return (unsigned long)__bpf_sk_lookup(NULL
, tuple
, len
, caller_net
,
5423 ifindex
, IPPROTO_UDP
, netns_id
,
5427 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto
= {
5428 .func
= bpf_xdp_sk_lookup_udp
,
5431 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
5432 .arg1_type
= ARG_PTR_TO_CTX
,
5433 .arg2_type
= ARG_PTR_TO_MEM
,
5434 .arg3_type
= ARG_CONST_SIZE
,
5435 .arg4_type
= ARG_ANYTHING
,
5436 .arg5_type
= ARG_ANYTHING
,
5439 BPF_CALL_5(bpf_xdp_skc_lookup_tcp
, struct xdp_buff
*, ctx
,
5440 struct bpf_sock_tuple
*, tuple
, u32
, len
, u32
, netns_id
, u64
, flags
)
5442 struct net
*caller_net
= dev_net(ctx
->rxq
->dev
);
5443 int ifindex
= ctx
->rxq
->dev
->ifindex
;
5445 return (unsigned long)__bpf_skc_lookup(NULL
, tuple
, len
, caller_net
,
5446 ifindex
, IPPROTO_TCP
, netns_id
,
5450 static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto
= {
5451 .func
= bpf_xdp_skc_lookup_tcp
,
5454 .ret_type
= RET_PTR_TO_SOCK_COMMON_OR_NULL
,
5455 .arg1_type
= ARG_PTR_TO_CTX
,
5456 .arg2_type
= ARG_PTR_TO_MEM
,
5457 .arg3_type
= ARG_CONST_SIZE
,
5458 .arg4_type
= ARG_ANYTHING
,
5459 .arg5_type
= ARG_ANYTHING
,
5462 BPF_CALL_5(bpf_xdp_sk_lookup_tcp
, struct xdp_buff
*, ctx
,
5463 struct bpf_sock_tuple
*, tuple
, u32
, len
, u32
, netns_id
, u64
, flags
)
5465 struct net
*caller_net
= dev_net(ctx
->rxq
->dev
);
5466 int ifindex
= ctx
->rxq
->dev
->ifindex
;
5468 return (unsigned long)__bpf_sk_lookup(NULL
, tuple
, len
, caller_net
,
5469 ifindex
, IPPROTO_TCP
, netns_id
,
5473 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto
= {
5474 .func
= bpf_xdp_sk_lookup_tcp
,
5477 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
5478 .arg1_type
= ARG_PTR_TO_CTX
,
5479 .arg2_type
= ARG_PTR_TO_MEM
,
5480 .arg3_type
= ARG_CONST_SIZE
,
5481 .arg4_type
= ARG_ANYTHING
,
5482 .arg5_type
= ARG_ANYTHING
,
5485 BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp
, struct bpf_sock_addr_kern
*, ctx
,
5486 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
5488 return (unsigned long)__bpf_skc_lookup(NULL
, tuple
, len
,
5489 sock_net(ctx
->sk
), 0,
5490 IPPROTO_TCP
, netns_id
, flags
);
5493 static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto
= {
5494 .func
= bpf_sock_addr_skc_lookup_tcp
,
5496 .ret_type
= RET_PTR_TO_SOCK_COMMON_OR_NULL
,
5497 .arg1_type
= ARG_PTR_TO_CTX
,
5498 .arg2_type
= ARG_PTR_TO_MEM
,
5499 .arg3_type
= ARG_CONST_SIZE
,
5500 .arg4_type
= ARG_ANYTHING
,
5501 .arg5_type
= ARG_ANYTHING
,
5504 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp
, struct bpf_sock_addr_kern
*, ctx
,
5505 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
5507 return (unsigned long)__bpf_sk_lookup(NULL
, tuple
, len
,
5508 sock_net(ctx
->sk
), 0, IPPROTO_TCP
,
5512 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto
= {
5513 .func
= bpf_sock_addr_sk_lookup_tcp
,
5515 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
5516 .arg1_type
= ARG_PTR_TO_CTX
,
5517 .arg2_type
= ARG_PTR_TO_MEM
,
5518 .arg3_type
= ARG_CONST_SIZE
,
5519 .arg4_type
= ARG_ANYTHING
,
5520 .arg5_type
= ARG_ANYTHING
,
5523 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp
, struct bpf_sock_addr_kern
*, ctx
,
5524 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
5526 return (unsigned long)__bpf_sk_lookup(NULL
, tuple
, len
,
5527 sock_net(ctx
->sk
), 0, IPPROTO_UDP
,
5531 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto
= {
5532 .func
= bpf_sock_addr_sk_lookup_udp
,
5534 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
5535 .arg1_type
= ARG_PTR_TO_CTX
,
5536 .arg2_type
= ARG_PTR_TO_MEM
,
5537 .arg3_type
= ARG_CONST_SIZE
,
5538 .arg4_type
= ARG_ANYTHING
,
5539 .arg5_type
= ARG_ANYTHING
,
5542 bool bpf_tcp_sock_is_valid_access(int off
, int size
, enum bpf_access_type type
,
5543 struct bpf_insn_access_aux
*info
)
5545 if (off
< 0 || off
>= offsetofend(struct bpf_tcp_sock
,
5549 if (off
% size
!= 0)
5553 case offsetof(struct bpf_tcp_sock
, bytes_received
):
5554 case offsetof(struct bpf_tcp_sock
, bytes_acked
):
5555 return size
== sizeof(__u64
);
5557 return size
== sizeof(__u32
);
5561 u32
bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type
,
5562 const struct bpf_insn
*si
,
5563 struct bpf_insn
*insn_buf
,
5564 struct bpf_prog
*prog
, u32
*target_size
)
5566 struct bpf_insn
*insn
= insn_buf
;
5568 #define BPF_TCP_SOCK_GET_COMMON(FIELD) \
5570 BUILD_BUG_ON(sizeof_field(struct tcp_sock, FIELD) > \
5571 sizeof_field(struct bpf_tcp_sock, FIELD)); \
5572 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\
5573 si->dst_reg, si->src_reg, \
5574 offsetof(struct tcp_sock, FIELD)); \
5577 #define BPF_INET_SOCK_GET_COMMON(FIELD) \
5579 BUILD_BUG_ON(sizeof_field(struct inet_connection_sock, \
5581 sizeof_field(struct bpf_tcp_sock, FIELD)); \
5582 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
5583 struct inet_connection_sock, \
5585 si->dst_reg, si->src_reg, \
5587 struct inet_connection_sock, \
5591 if (insn
> insn_buf
)
5592 return insn
- insn_buf
;
5595 case offsetof(struct bpf_tcp_sock
, rtt_min
):
5596 BUILD_BUG_ON(sizeof_field(struct tcp_sock
, rtt_min
) !=
5597 sizeof(struct minmax
));
5598 BUILD_BUG_ON(sizeof(struct minmax
) <
5599 sizeof(struct minmax_sample
));
5601 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
5602 offsetof(struct tcp_sock
, rtt_min
) +
5603 offsetof(struct minmax_sample
, v
));
5605 case offsetof(struct bpf_tcp_sock
, snd_cwnd
):
5606 BPF_TCP_SOCK_GET_COMMON(snd_cwnd
);
5608 case offsetof(struct bpf_tcp_sock
, srtt_us
):
5609 BPF_TCP_SOCK_GET_COMMON(srtt_us
);
5611 case offsetof(struct bpf_tcp_sock
, snd_ssthresh
):
5612 BPF_TCP_SOCK_GET_COMMON(snd_ssthresh
);
5614 case offsetof(struct bpf_tcp_sock
, rcv_nxt
):
5615 BPF_TCP_SOCK_GET_COMMON(rcv_nxt
);
5617 case offsetof(struct bpf_tcp_sock
, snd_nxt
):
5618 BPF_TCP_SOCK_GET_COMMON(snd_nxt
);
5620 case offsetof(struct bpf_tcp_sock
, snd_una
):
5621 BPF_TCP_SOCK_GET_COMMON(snd_una
);
5623 case offsetof(struct bpf_tcp_sock
, mss_cache
):
5624 BPF_TCP_SOCK_GET_COMMON(mss_cache
);
5626 case offsetof(struct bpf_tcp_sock
, ecn_flags
):
5627 BPF_TCP_SOCK_GET_COMMON(ecn_flags
);
5629 case offsetof(struct bpf_tcp_sock
, rate_delivered
):
5630 BPF_TCP_SOCK_GET_COMMON(rate_delivered
);
5632 case offsetof(struct bpf_tcp_sock
, rate_interval_us
):
5633 BPF_TCP_SOCK_GET_COMMON(rate_interval_us
);
5635 case offsetof(struct bpf_tcp_sock
, packets_out
):
5636 BPF_TCP_SOCK_GET_COMMON(packets_out
);
5638 case offsetof(struct bpf_tcp_sock
, retrans_out
):
5639 BPF_TCP_SOCK_GET_COMMON(retrans_out
);
5641 case offsetof(struct bpf_tcp_sock
, total_retrans
):
5642 BPF_TCP_SOCK_GET_COMMON(total_retrans
);
5644 case offsetof(struct bpf_tcp_sock
, segs_in
):
5645 BPF_TCP_SOCK_GET_COMMON(segs_in
);
5647 case offsetof(struct bpf_tcp_sock
, data_segs_in
):
5648 BPF_TCP_SOCK_GET_COMMON(data_segs_in
);
5650 case offsetof(struct bpf_tcp_sock
, segs_out
):
5651 BPF_TCP_SOCK_GET_COMMON(segs_out
);
5653 case offsetof(struct bpf_tcp_sock
, data_segs_out
):
5654 BPF_TCP_SOCK_GET_COMMON(data_segs_out
);
5656 case offsetof(struct bpf_tcp_sock
, lost_out
):
5657 BPF_TCP_SOCK_GET_COMMON(lost_out
);
5659 case offsetof(struct bpf_tcp_sock
, sacked_out
):
5660 BPF_TCP_SOCK_GET_COMMON(sacked_out
);
5662 case offsetof(struct bpf_tcp_sock
, bytes_received
):
5663 BPF_TCP_SOCK_GET_COMMON(bytes_received
);
5665 case offsetof(struct bpf_tcp_sock
, bytes_acked
):
5666 BPF_TCP_SOCK_GET_COMMON(bytes_acked
);
5668 case offsetof(struct bpf_tcp_sock
, dsack_dups
):
5669 BPF_TCP_SOCK_GET_COMMON(dsack_dups
);
5671 case offsetof(struct bpf_tcp_sock
, delivered
):
5672 BPF_TCP_SOCK_GET_COMMON(delivered
);
5674 case offsetof(struct bpf_tcp_sock
, delivered_ce
):
5675 BPF_TCP_SOCK_GET_COMMON(delivered_ce
);
5677 case offsetof(struct bpf_tcp_sock
, icsk_retransmits
):
5678 BPF_INET_SOCK_GET_COMMON(icsk_retransmits
);
5682 return insn
- insn_buf
;
5685 BPF_CALL_1(bpf_tcp_sock
, struct sock
*, sk
)
5687 if (sk_fullsock(sk
) && sk
->sk_protocol
== IPPROTO_TCP
)
5688 return (unsigned long)sk
;
5690 return (unsigned long)NULL
;
5693 const struct bpf_func_proto bpf_tcp_sock_proto
= {
5694 .func
= bpf_tcp_sock
,
5696 .ret_type
= RET_PTR_TO_TCP_SOCK_OR_NULL
,
5697 .arg1_type
= ARG_PTR_TO_SOCK_COMMON
,
5700 BPF_CALL_1(bpf_get_listener_sock
, struct sock
*, sk
)
5702 sk
= sk_to_full_sk(sk
);
5704 if (sk
->sk_state
== TCP_LISTEN
&& sock_flag(sk
, SOCK_RCU_FREE
))
5705 return (unsigned long)sk
;
5707 return (unsigned long)NULL
;
5710 static const struct bpf_func_proto bpf_get_listener_sock_proto
= {
5711 .func
= bpf_get_listener_sock
,
5713 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
5714 .arg1_type
= ARG_PTR_TO_SOCK_COMMON
,
5717 BPF_CALL_1(bpf_skb_ecn_set_ce
, struct sk_buff
*, skb
)
5719 unsigned int iphdr_len
;
5721 if (skb
->protocol
== cpu_to_be16(ETH_P_IP
))
5722 iphdr_len
= sizeof(struct iphdr
);
5723 else if (skb
->protocol
== cpu_to_be16(ETH_P_IPV6
))
5724 iphdr_len
= sizeof(struct ipv6hdr
);
5728 if (skb_headlen(skb
) < iphdr_len
)
5731 if (skb_cloned(skb
) && !skb_clone_writable(skb
, iphdr_len
))
5734 return INET_ECN_set_ce(skb
);
5737 bool bpf_xdp_sock_is_valid_access(int off
, int size
, enum bpf_access_type type
,
5738 struct bpf_insn_access_aux
*info
)
5740 if (off
< 0 || off
>= offsetofend(struct bpf_xdp_sock
, queue_id
))
5743 if (off
% size
!= 0)
5748 return size
== sizeof(__u32
);
5752 u32
bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type
,
5753 const struct bpf_insn
*si
,
5754 struct bpf_insn
*insn_buf
,
5755 struct bpf_prog
*prog
, u32
*target_size
)
5757 struct bpf_insn
*insn
= insn_buf
;
5759 #define BPF_XDP_SOCK_GET(FIELD) \
5761 BUILD_BUG_ON(sizeof_field(struct xdp_sock, FIELD) > \
5762 sizeof_field(struct bpf_xdp_sock, FIELD)); \
5763 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\
5764 si->dst_reg, si->src_reg, \
5765 offsetof(struct xdp_sock, FIELD)); \
5769 case offsetof(struct bpf_xdp_sock
, queue_id
):
5770 BPF_XDP_SOCK_GET(queue_id
);
5774 return insn
- insn_buf
;
5777 static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto
= {
5778 .func
= bpf_skb_ecn_set_ce
,
5780 .ret_type
= RET_INTEGER
,
5781 .arg1_type
= ARG_PTR_TO_CTX
,
5784 BPF_CALL_5(bpf_tcp_check_syncookie
, struct sock
*, sk
, void *, iph
, u32
, iph_len
,
5785 struct tcphdr
*, th
, u32
, th_len
)
5787 #ifdef CONFIG_SYN_COOKIES
5791 if (unlikely(th_len
< sizeof(*th
)))
5794 /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */
5795 if (sk
->sk_protocol
!= IPPROTO_TCP
|| sk
->sk_state
!= TCP_LISTEN
)
5798 if (!sock_net(sk
)->ipv4
.sysctl_tcp_syncookies
)
5801 if (!th
->ack
|| th
->rst
|| th
->syn
)
5804 if (tcp_synq_no_recent_overflow(sk
))
5807 cookie
= ntohl(th
->ack_seq
) - 1;
5809 switch (sk
->sk_family
) {
5811 if (unlikely(iph_len
< sizeof(struct iphdr
)))
5814 ret
= __cookie_v4_check((struct iphdr
*)iph
, th
, cookie
);
5817 #if IS_BUILTIN(CONFIG_IPV6)
5819 if (unlikely(iph_len
< sizeof(struct ipv6hdr
)))
5822 ret
= __cookie_v6_check((struct ipv6hdr
*)iph
, th
, cookie
);
5824 #endif /* CONFIG_IPV6 */
5827 return -EPROTONOSUPPORT
;
5839 static const struct bpf_func_proto bpf_tcp_check_syncookie_proto
= {
5840 .func
= bpf_tcp_check_syncookie
,
5843 .ret_type
= RET_INTEGER
,
5844 .arg1_type
= ARG_PTR_TO_SOCK_COMMON
,
5845 .arg2_type
= ARG_PTR_TO_MEM
,
5846 .arg3_type
= ARG_CONST_SIZE
,
5847 .arg4_type
= ARG_PTR_TO_MEM
,
5848 .arg5_type
= ARG_CONST_SIZE
,
5851 BPF_CALL_5(bpf_tcp_gen_syncookie
, struct sock
*, sk
, void *, iph
, u32
, iph_len
,
5852 struct tcphdr
*, th
, u32
, th_len
)
5854 #ifdef CONFIG_SYN_COOKIES
5858 if (unlikely(th_len
< sizeof(*th
) || th_len
!= th
->doff
* 4))
5861 if (sk
->sk_protocol
!= IPPROTO_TCP
|| sk
->sk_state
!= TCP_LISTEN
)
5864 if (!sock_net(sk
)->ipv4
.sysctl_tcp_syncookies
)
5867 if (!th
->syn
|| th
->ack
|| th
->fin
|| th
->rst
)
5870 if (unlikely(iph_len
< sizeof(struct iphdr
)))
5873 /* Both struct iphdr and struct ipv6hdr have the version field at the
5874 * same offset so we can cast to the shorter header (struct iphdr).
5876 switch (((struct iphdr
*)iph
)->version
) {
5878 if (sk
->sk_family
== AF_INET6
&& sk
->sk_ipv6only
)
5881 mss
= tcp_v4_get_syncookie(sk
, iph
, th
, &cookie
);
5884 #if IS_BUILTIN(CONFIG_IPV6)
5886 if (unlikely(iph_len
< sizeof(struct ipv6hdr
)))
5889 if (sk
->sk_family
!= AF_INET6
)
5892 mss
= tcp_v6_get_syncookie(sk
, iph
, th
, &cookie
);
5894 #endif /* CONFIG_IPV6 */
5897 return -EPROTONOSUPPORT
;
5902 return cookie
| ((u64
)mss
<< 32);
5905 #endif /* CONFIG_SYN_COOKIES */
5908 static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto
= {
5909 .func
= bpf_tcp_gen_syncookie
,
5910 .gpl_only
= true, /* __cookie_v*_init_sequence() is GPL */
5912 .ret_type
= RET_INTEGER
,
5913 .arg1_type
= ARG_PTR_TO_SOCK_COMMON
,
5914 .arg2_type
= ARG_PTR_TO_MEM
,
5915 .arg3_type
= ARG_CONST_SIZE
,
5916 .arg4_type
= ARG_PTR_TO_MEM
,
5917 .arg5_type
= ARG_CONST_SIZE
,
5920 BPF_CALL_3(bpf_sk_assign
, struct sk_buff
*, skb
, struct sock
*, sk
, u64
, flags
)
5924 if (!skb_at_tc_ingress(skb
))
5926 if (unlikely(dev_net(skb
->dev
) != sock_net(sk
)))
5927 return -ENETUNREACH
;
5928 if (unlikely(sk
->sk_reuseport
))
5929 return -ESOCKTNOSUPPORT
;
5930 if (sk_is_refcounted(sk
) &&
5931 unlikely(!refcount_inc_not_zero(&sk
->sk_refcnt
)))
5936 skb
->destructor
= sock_pfree
;
5941 static const struct bpf_func_proto bpf_sk_assign_proto
= {
5942 .func
= bpf_sk_assign
,
5944 .ret_type
= RET_INTEGER
,
5945 .arg1_type
= ARG_PTR_TO_CTX
,
5946 .arg2_type
= ARG_PTR_TO_SOCK_COMMON
,
5947 .arg3_type
= ARG_ANYTHING
,
5950 #endif /* CONFIG_INET */
5952 bool bpf_helper_changes_pkt_data(void *func
)
5954 if (func
== bpf_skb_vlan_push
||
5955 func
== bpf_skb_vlan_pop
||
5956 func
== bpf_skb_store_bytes
||
5957 func
== bpf_skb_change_proto
||
5958 func
== bpf_skb_change_head
||
5959 func
== sk_skb_change_head
||
5960 func
== bpf_skb_change_tail
||
5961 func
== sk_skb_change_tail
||
5962 func
== bpf_skb_adjust_room
||
5963 func
== bpf_skb_pull_data
||
5964 func
== sk_skb_pull_data
||
5965 func
== bpf_clone_redirect
||
5966 func
== bpf_l3_csum_replace
||
5967 func
== bpf_l4_csum_replace
||
5968 func
== bpf_xdp_adjust_head
||
5969 func
== bpf_xdp_adjust_meta
||
5970 func
== bpf_msg_pull_data
||
5971 func
== bpf_msg_push_data
||
5972 func
== bpf_msg_pop_data
||
5973 func
== bpf_xdp_adjust_tail
||
5974 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
5975 func
== bpf_lwt_seg6_store_bytes
||
5976 func
== bpf_lwt_seg6_adjust_srh
||
5977 func
== bpf_lwt_seg6_action
||
5979 func
== bpf_lwt_in_push_encap
||
5980 func
== bpf_lwt_xmit_push_encap
)
5986 const struct bpf_func_proto
*
5987 bpf_base_func_proto(enum bpf_func_id func_id
)
5990 case BPF_FUNC_map_lookup_elem
:
5991 return &bpf_map_lookup_elem_proto
;
5992 case BPF_FUNC_map_update_elem
:
5993 return &bpf_map_update_elem_proto
;
5994 case BPF_FUNC_map_delete_elem
:
5995 return &bpf_map_delete_elem_proto
;
5996 case BPF_FUNC_map_push_elem
:
5997 return &bpf_map_push_elem_proto
;
5998 case BPF_FUNC_map_pop_elem
:
5999 return &bpf_map_pop_elem_proto
;
6000 case BPF_FUNC_map_peek_elem
:
6001 return &bpf_map_peek_elem_proto
;
6002 case BPF_FUNC_get_prandom_u32
:
6003 return &bpf_get_prandom_u32_proto
;
6004 case BPF_FUNC_get_smp_processor_id
:
6005 return &bpf_get_raw_smp_processor_id_proto
;
6006 case BPF_FUNC_get_numa_node_id
:
6007 return &bpf_get_numa_node_id_proto
;
6008 case BPF_FUNC_tail_call
:
6009 return &bpf_tail_call_proto
;
6010 case BPF_FUNC_ktime_get_ns
:
6011 return &bpf_ktime_get_ns_proto
;
6016 if (!capable(CAP_SYS_ADMIN
))
6020 case BPF_FUNC_spin_lock
:
6021 return &bpf_spin_lock_proto
;
6022 case BPF_FUNC_spin_unlock
:
6023 return &bpf_spin_unlock_proto
;
6024 case BPF_FUNC_trace_printk
:
6025 return bpf_get_trace_printk_proto();
6026 case BPF_FUNC_jiffies64
:
6027 return &bpf_jiffies64_proto
;
6033 static const struct bpf_func_proto
*
6034 sock_filter_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
6037 /* inet and inet6 sockets are created in a process
6038 * context so there is always a valid uid/gid
6040 case BPF_FUNC_get_current_uid_gid
:
6041 return &bpf_get_current_uid_gid_proto
;
6042 case BPF_FUNC_get_local_storage
:
6043 return &bpf_get_local_storage_proto
;
6044 case BPF_FUNC_get_socket_cookie
:
6045 return &bpf_get_socket_cookie_sock_proto
;
6046 case BPF_FUNC_get_netns_cookie
:
6047 return &bpf_get_netns_cookie_sock_proto
;
6048 case BPF_FUNC_perf_event_output
:
6049 return &bpf_event_output_data_proto
;
6050 case BPF_FUNC_get_current_pid_tgid
:
6051 return &bpf_get_current_pid_tgid_proto
;
6052 case BPF_FUNC_get_current_comm
:
6053 return &bpf_get_current_comm_proto
;
6054 #ifdef CONFIG_CGROUPS
6055 case BPF_FUNC_get_current_cgroup_id
:
6056 return &bpf_get_current_cgroup_id_proto
;
6057 case BPF_FUNC_get_current_ancestor_cgroup_id
:
6058 return &bpf_get_current_ancestor_cgroup_id_proto
;
6060 #ifdef CONFIG_CGROUP_NET_CLASSID
6061 case BPF_FUNC_get_cgroup_classid
:
6062 return &bpf_get_cgroup_classid_curr_proto
;
6065 return bpf_base_func_proto(func_id
);
6069 static const struct bpf_func_proto
*
6070 sock_addr_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
6073 /* inet and inet6 sockets are created in a process
6074 * context so there is always a valid uid/gid
6076 case BPF_FUNC_get_current_uid_gid
:
6077 return &bpf_get_current_uid_gid_proto
;
6079 switch (prog
->expected_attach_type
) {
6080 case BPF_CGROUP_INET4_CONNECT
:
6081 case BPF_CGROUP_INET6_CONNECT
:
6082 return &bpf_bind_proto
;
6086 case BPF_FUNC_get_socket_cookie
:
6087 return &bpf_get_socket_cookie_sock_addr_proto
;
6088 case BPF_FUNC_get_netns_cookie
:
6089 return &bpf_get_netns_cookie_sock_addr_proto
;
6090 case BPF_FUNC_get_local_storage
:
6091 return &bpf_get_local_storage_proto
;
6092 case BPF_FUNC_perf_event_output
:
6093 return &bpf_event_output_data_proto
;
6094 case BPF_FUNC_get_current_pid_tgid
:
6095 return &bpf_get_current_pid_tgid_proto
;
6096 case BPF_FUNC_get_current_comm
:
6097 return &bpf_get_current_comm_proto
;
6098 #ifdef CONFIG_CGROUPS
6099 case BPF_FUNC_get_current_cgroup_id
:
6100 return &bpf_get_current_cgroup_id_proto
;
6101 case BPF_FUNC_get_current_ancestor_cgroup_id
:
6102 return &bpf_get_current_ancestor_cgroup_id_proto
;
6104 #ifdef CONFIG_CGROUP_NET_CLASSID
6105 case BPF_FUNC_get_cgroup_classid
:
6106 return &bpf_get_cgroup_classid_curr_proto
;
6109 case BPF_FUNC_sk_lookup_tcp
:
6110 return &bpf_sock_addr_sk_lookup_tcp_proto
;
6111 case BPF_FUNC_sk_lookup_udp
:
6112 return &bpf_sock_addr_sk_lookup_udp_proto
;
6113 case BPF_FUNC_sk_release
:
6114 return &bpf_sk_release_proto
;
6115 case BPF_FUNC_skc_lookup_tcp
:
6116 return &bpf_sock_addr_skc_lookup_tcp_proto
;
6117 #endif /* CONFIG_INET */
6118 case BPF_FUNC_sk_storage_get
:
6119 return &bpf_sk_storage_get_proto
;
6120 case BPF_FUNC_sk_storage_delete
:
6121 return &bpf_sk_storage_delete_proto
;
6123 return bpf_base_func_proto(func_id
);
6127 static const struct bpf_func_proto
*
6128 sk_filter_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
6131 case BPF_FUNC_skb_load_bytes
:
6132 return &bpf_skb_load_bytes_proto
;
6133 case BPF_FUNC_skb_load_bytes_relative
:
6134 return &bpf_skb_load_bytes_relative_proto
;
6135 case BPF_FUNC_get_socket_cookie
:
6136 return &bpf_get_socket_cookie_proto
;
6137 case BPF_FUNC_get_socket_uid
:
6138 return &bpf_get_socket_uid_proto
;
6139 case BPF_FUNC_perf_event_output
:
6140 return &bpf_skb_event_output_proto
;
6142 return bpf_base_func_proto(func_id
);
6146 const struct bpf_func_proto bpf_sk_storage_get_proto __weak
;
6147 const struct bpf_func_proto bpf_sk_storage_delete_proto __weak
;
6149 static const struct bpf_func_proto
*
6150 cg_skb_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
6153 case BPF_FUNC_get_local_storage
:
6154 return &bpf_get_local_storage_proto
;
6155 case BPF_FUNC_sk_fullsock
:
6156 return &bpf_sk_fullsock_proto
;
6157 case BPF_FUNC_sk_storage_get
:
6158 return &bpf_sk_storage_get_proto
;
6159 case BPF_FUNC_sk_storage_delete
:
6160 return &bpf_sk_storage_delete_proto
;
6161 case BPF_FUNC_perf_event_output
:
6162 return &bpf_skb_event_output_proto
;
6163 #ifdef CONFIG_SOCK_CGROUP_DATA
6164 case BPF_FUNC_skb_cgroup_id
:
6165 return &bpf_skb_cgroup_id_proto
;
6168 case BPF_FUNC_tcp_sock
:
6169 return &bpf_tcp_sock_proto
;
6170 case BPF_FUNC_get_listener_sock
:
6171 return &bpf_get_listener_sock_proto
;
6172 case BPF_FUNC_skb_ecn_set_ce
:
6173 return &bpf_skb_ecn_set_ce_proto
;
6176 return sk_filter_func_proto(func_id
, prog
);
6180 static const struct bpf_func_proto
*
6181 tc_cls_act_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
6184 case BPF_FUNC_skb_store_bytes
:
6185 return &bpf_skb_store_bytes_proto
;
6186 case BPF_FUNC_skb_load_bytes
:
6187 return &bpf_skb_load_bytes_proto
;
6188 case BPF_FUNC_skb_load_bytes_relative
:
6189 return &bpf_skb_load_bytes_relative_proto
;
6190 case BPF_FUNC_skb_pull_data
:
6191 return &bpf_skb_pull_data_proto
;
6192 case BPF_FUNC_csum_diff
:
6193 return &bpf_csum_diff_proto
;
6194 case BPF_FUNC_csum_update
:
6195 return &bpf_csum_update_proto
;
6196 case BPF_FUNC_l3_csum_replace
:
6197 return &bpf_l3_csum_replace_proto
;
6198 case BPF_FUNC_l4_csum_replace
:
6199 return &bpf_l4_csum_replace_proto
;
6200 case BPF_FUNC_clone_redirect
:
6201 return &bpf_clone_redirect_proto
;
6202 case BPF_FUNC_get_cgroup_classid
:
6203 return &bpf_get_cgroup_classid_proto
;
6204 case BPF_FUNC_skb_vlan_push
:
6205 return &bpf_skb_vlan_push_proto
;
6206 case BPF_FUNC_skb_vlan_pop
:
6207 return &bpf_skb_vlan_pop_proto
;
6208 case BPF_FUNC_skb_change_proto
:
6209 return &bpf_skb_change_proto_proto
;
6210 case BPF_FUNC_skb_change_type
:
6211 return &bpf_skb_change_type_proto
;
6212 case BPF_FUNC_skb_adjust_room
:
6213 return &bpf_skb_adjust_room_proto
;
6214 case BPF_FUNC_skb_change_tail
:
6215 return &bpf_skb_change_tail_proto
;
6216 case BPF_FUNC_skb_get_tunnel_key
:
6217 return &bpf_skb_get_tunnel_key_proto
;
6218 case BPF_FUNC_skb_set_tunnel_key
:
6219 return bpf_get_skb_set_tunnel_proto(func_id
);
6220 case BPF_FUNC_skb_get_tunnel_opt
:
6221 return &bpf_skb_get_tunnel_opt_proto
;
6222 case BPF_FUNC_skb_set_tunnel_opt
:
6223 return bpf_get_skb_set_tunnel_proto(func_id
);
6224 case BPF_FUNC_redirect
:
6225 return &bpf_redirect_proto
;
6226 case BPF_FUNC_get_route_realm
:
6227 return &bpf_get_route_realm_proto
;
6228 case BPF_FUNC_get_hash_recalc
:
6229 return &bpf_get_hash_recalc_proto
;
6230 case BPF_FUNC_set_hash_invalid
:
6231 return &bpf_set_hash_invalid_proto
;
6232 case BPF_FUNC_set_hash
:
6233 return &bpf_set_hash_proto
;
6234 case BPF_FUNC_perf_event_output
:
6235 return &bpf_skb_event_output_proto
;
6236 case BPF_FUNC_get_smp_processor_id
:
6237 return &bpf_get_smp_processor_id_proto
;
6238 case BPF_FUNC_skb_under_cgroup
:
6239 return &bpf_skb_under_cgroup_proto
;
6240 case BPF_FUNC_get_socket_cookie
:
6241 return &bpf_get_socket_cookie_proto
;
6242 case BPF_FUNC_get_socket_uid
:
6243 return &bpf_get_socket_uid_proto
;
6244 case BPF_FUNC_fib_lookup
:
6245 return &bpf_skb_fib_lookup_proto
;
6246 case BPF_FUNC_sk_fullsock
:
6247 return &bpf_sk_fullsock_proto
;
6248 case BPF_FUNC_sk_storage_get
:
6249 return &bpf_sk_storage_get_proto
;
6250 case BPF_FUNC_sk_storage_delete
:
6251 return &bpf_sk_storage_delete_proto
;
6253 case BPF_FUNC_skb_get_xfrm_state
:
6254 return &bpf_skb_get_xfrm_state_proto
;
6256 #ifdef CONFIG_SOCK_CGROUP_DATA
6257 case BPF_FUNC_skb_cgroup_id
:
6258 return &bpf_skb_cgroup_id_proto
;
6259 case BPF_FUNC_skb_ancestor_cgroup_id
:
6260 return &bpf_skb_ancestor_cgroup_id_proto
;
6263 case BPF_FUNC_sk_lookup_tcp
:
6264 return &bpf_sk_lookup_tcp_proto
;
6265 case BPF_FUNC_sk_lookup_udp
:
6266 return &bpf_sk_lookup_udp_proto
;
6267 case BPF_FUNC_sk_release
:
6268 return &bpf_sk_release_proto
;
6269 case BPF_FUNC_tcp_sock
:
6270 return &bpf_tcp_sock_proto
;
6271 case BPF_FUNC_get_listener_sock
:
6272 return &bpf_get_listener_sock_proto
;
6273 case BPF_FUNC_skc_lookup_tcp
:
6274 return &bpf_skc_lookup_tcp_proto
;
6275 case BPF_FUNC_tcp_check_syncookie
:
6276 return &bpf_tcp_check_syncookie_proto
;
6277 case BPF_FUNC_skb_ecn_set_ce
:
6278 return &bpf_skb_ecn_set_ce_proto
;
6279 case BPF_FUNC_tcp_gen_syncookie
:
6280 return &bpf_tcp_gen_syncookie_proto
;
6281 case BPF_FUNC_sk_assign
:
6282 return &bpf_sk_assign_proto
;
6285 return bpf_base_func_proto(func_id
);
6289 static const struct bpf_func_proto
*
6290 xdp_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
6293 case BPF_FUNC_perf_event_output
:
6294 return &bpf_xdp_event_output_proto
;
6295 case BPF_FUNC_get_smp_processor_id
:
6296 return &bpf_get_smp_processor_id_proto
;
6297 case BPF_FUNC_csum_diff
:
6298 return &bpf_csum_diff_proto
;
6299 case BPF_FUNC_xdp_adjust_head
:
6300 return &bpf_xdp_adjust_head_proto
;
6301 case BPF_FUNC_xdp_adjust_meta
:
6302 return &bpf_xdp_adjust_meta_proto
;
6303 case BPF_FUNC_redirect
:
6304 return &bpf_xdp_redirect_proto
;
6305 case BPF_FUNC_redirect_map
:
6306 return &bpf_xdp_redirect_map_proto
;
6307 case BPF_FUNC_xdp_adjust_tail
:
6308 return &bpf_xdp_adjust_tail_proto
;
6309 case BPF_FUNC_fib_lookup
:
6310 return &bpf_xdp_fib_lookup_proto
;
6312 case BPF_FUNC_sk_lookup_udp
:
6313 return &bpf_xdp_sk_lookup_udp_proto
;
6314 case BPF_FUNC_sk_lookup_tcp
:
6315 return &bpf_xdp_sk_lookup_tcp_proto
;
6316 case BPF_FUNC_sk_release
:
6317 return &bpf_sk_release_proto
;
6318 case BPF_FUNC_skc_lookup_tcp
:
6319 return &bpf_xdp_skc_lookup_tcp_proto
;
6320 case BPF_FUNC_tcp_check_syncookie
:
6321 return &bpf_tcp_check_syncookie_proto
;
6322 case BPF_FUNC_tcp_gen_syncookie
:
6323 return &bpf_tcp_gen_syncookie_proto
;
6326 return bpf_base_func_proto(func_id
);
6330 const struct bpf_func_proto bpf_sock_map_update_proto __weak
;
6331 const struct bpf_func_proto bpf_sock_hash_update_proto __weak
;
6333 static const struct bpf_func_proto
*
6334 sock_ops_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
6337 case BPF_FUNC_setsockopt
:
6338 return &bpf_setsockopt_proto
;
6339 case BPF_FUNC_getsockopt
:
6340 return &bpf_getsockopt_proto
;
6341 case BPF_FUNC_sock_ops_cb_flags_set
:
6342 return &bpf_sock_ops_cb_flags_set_proto
;
6343 case BPF_FUNC_sock_map_update
:
6344 return &bpf_sock_map_update_proto
;
6345 case BPF_FUNC_sock_hash_update
:
6346 return &bpf_sock_hash_update_proto
;
6347 case BPF_FUNC_get_socket_cookie
:
6348 return &bpf_get_socket_cookie_sock_ops_proto
;
6349 case BPF_FUNC_get_local_storage
:
6350 return &bpf_get_local_storage_proto
;
6351 case BPF_FUNC_perf_event_output
:
6352 return &bpf_event_output_data_proto
;
6353 case BPF_FUNC_sk_storage_get
:
6354 return &bpf_sk_storage_get_proto
;
6355 case BPF_FUNC_sk_storage_delete
:
6356 return &bpf_sk_storage_delete_proto
;
6358 case BPF_FUNC_tcp_sock
:
6359 return &bpf_tcp_sock_proto
;
6360 #endif /* CONFIG_INET */
6362 return bpf_base_func_proto(func_id
);
6366 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak
;
6367 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak
;
6369 static const struct bpf_func_proto
*
6370 sk_msg_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
6373 case BPF_FUNC_msg_redirect_map
:
6374 return &bpf_msg_redirect_map_proto
;
6375 case BPF_FUNC_msg_redirect_hash
:
6376 return &bpf_msg_redirect_hash_proto
;
6377 case BPF_FUNC_msg_apply_bytes
:
6378 return &bpf_msg_apply_bytes_proto
;
6379 case BPF_FUNC_msg_cork_bytes
:
6380 return &bpf_msg_cork_bytes_proto
;
6381 case BPF_FUNC_msg_pull_data
:
6382 return &bpf_msg_pull_data_proto
;
6383 case BPF_FUNC_msg_push_data
:
6384 return &bpf_msg_push_data_proto
;
6385 case BPF_FUNC_msg_pop_data
:
6386 return &bpf_msg_pop_data_proto
;
6388 return bpf_base_func_proto(func_id
);
6392 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak
;
6393 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak
;
6395 static const struct bpf_func_proto
*
6396 sk_skb_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
6399 case BPF_FUNC_skb_store_bytes
:
6400 return &bpf_skb_store_bytes_proto
;
6401 case BPF_FUNC_skb_load_bytes
:
6402 return &bpf_skb_load_bytes_proto
;
6403 case BPF_FUNC_skb_pull_data
:
6404 return &sk_skb_pull_data_proto
;
6405 case BPF_FUNC_skb_change_tail
:
6406 return &sk_skb_change_tail_proto
;
6407 case BPF_FUNC_skb_change_head
:
6408 return &sk_skb_change_head_proto
;
6409 case BPF_FUNC_get_socket_cookie
:
6410 return &bpf_get_socket_cookie_proto
;
6411 case BPF_FUNC_get_socket_uid
:
6412 return &bpf_get_socket_uid_proto
;
6413 case BPF_FUNC_sk_redirect_map
:
6414 return &bpf_sk_redirect_map_proto
;
6415 case BPF_FUNC_sk_redirect_hash
:
6416 return &bpf_sk_redirect_hash_proto
;
6417 case BPF_FUNC_perf_event_output
:
6418 return &bpf_skb_event_output_proto
;
6420 case BPF_FUNC_sk_lookup_tcp
:
6421 return &bpf_sk_lookup_tcp_proto
;
6422 case BPF_FUNC_sk_lookup_udp
:
6423 return &bpf_sk_lookup_udp_proto
;
6424 case BPF_FUNC_sk_release
:
6425 return &bpf_sk_release_proto
;
6426 case BPF_FUNC_skc_lookup_tcp
:
6427 return &bpf_skc_lookup_tcp_proto
;
6430 return bpf_base_func_proto(func_id
);
6434 static const struct bpf_func_proto
*
6435 flow_dissector_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
6438 case BPF_FUNC_skb_load_bytes
:
6439 return &bpf_flow_dissector_load_bytes_proto
;
6441 return bpf_base_func_proto(func_id
);
6445 static const struct bpf_func_proto
*
6446 lwt_out_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
6449 case BPF_FUNC_skb_load_bytes
:
6450 return &bpf_skb_load_bytes_proto
;
6451 case BPF_FUNC_skb_pull_data
:
6452 return &bpf_skb_pull_data_proto
;
6453 case BPF_FUNC_csum_diff
:
6454 return &bpf_csum_diff_proto
;
6455 case BPF_FUNC_get_cgroup_classid
:
6456 return &bpf_get_cgroup_classid_proto
;
6457 case BPF_FUNC_get_route_realm
:
6458 return &bpf_get_route_realm_proto
;
6459 case BPF_FUNC_get_hash_recalc
:
6460 return &bpf_get_hash_recalc_proto
;
6461 case BPF_FUNC_perf_event_output
:
6462 return &bpf_skb_event_output_proto
;
6463 case BPF_FUNC_get_smp_processor_id
:
6464 return &bpf_get_smp_processor_id_proto
;
6465 case BPF_FUNC_skb_under_cgroup
:
6466 return &bpf_skb_under_cgroup_proto
;
6468 return bpf_base_func_proto(func_id
);
6472 static const struct bpf_func_proto
*
6473 lwt_in_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
6476 case BPF_FUNC_lwt_push_encap
:
6477 return &bpf_lwt_in_push_encap_proto
;
6479 return lwt_out_func_proto(func_id
, prog
);
6483 static const struct bpf_func_proto
*
6484 lwt_xmit_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
6487 case BPF_FUNC_skb_get_tunnel_key
:
6488 return &bpf_skb_get_tunnel_key_proto
;
6489 case BPF_FUNC_skb_set_tunnel_key
:
6490 return bpf_get_skb_set_tunnel_proto(func_id
);
6491 case BPF_FUNC_skb_get_tunnel_opt
:
6492 return &bpf_skb_get_tunnel_opt_proto
;
6493 case BPF_FUNC_skb_set_tunnel_opt
:
6494 return bpf_get_skb_set_tunnel_proto(func_id
);
6495 case BPF_FUNC_redirect
:
6496 return &bpf_redirect_proto
;
6497 case BPF_FUNC_clone_redirect
:
6498 return &bpf_clone_redirect_proto
;
6499 case BPF_FUNC_skb_change_tail
:
6500 return &bpf_skb_change_tail_proto
;
6501 case BPF_FUNC_skb_change_head
:
6502 return &bpf_skb_change_head_proto
;
6503 case BPF_FUNC_skb_store_bytes
:
6504 return &bpf_skb_store_bytes_proto
;
6505 case BPF_FUNC_csum_update
:
6506 return &bpf_csum_update_proto
;
6507 case BPF_FUNC_l3_csum_replace
:
6508 return &bpf_l3_csum_replace_proto
;
6509 case BPF_FUNC_l4_csum_replace
:
6510 return &bpf_l4_csum_replace_proto
;
6511 case BPF_FUNC_set_hash_invalid
:
6512 return &bpf_set_hash_invalid_proto
;
6513 case BPF_FUNC_lwt_push_encap
:
6514 return &bpf_lwt_xmit_push_encap_proto
;
6516 return lwt_out_func_proto(func_id
, prog
);
6520 static const struct bpf_func_proto
*
6521 lwt_seg6local_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
6524 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
6525 case BPF_FUNC_lwt_seg6_store_bytes
:
6526 return &bpf_lwt_seg6_store_bytes_proto
;
6527 case BPF_FUNC_lwt_seg6_action
:
6528 return &bpf_lwt_seg6_action_proto
;
6529 case BPF_FUNC_lwt_seg6_adjust_srh
:
6530 return &bpf_lwt_seg6_adjust_srh_proto
;
6533 return lwt_out_func_proto(func_id
, prog
);
6537 static bool bpf_skb_is_valid_access(int off
, int size
, enum bpf_access_type type
,
6538 const struct bpf_prog
*prog
,
6539 struct bpf_insn_access_aux
*info
)
6541 const int size_default
= sizeof(__u32
);
6543 if (off
< 0 || off
>= sizeof(struct __sk_buff
))
6546 /* The verifier guarantees that size > 0. */
6547 if (off
% size
!= 0)
6551 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
6552 if (off
+ size
> offsetofend(struct __sk_buff
, cb
[4]))
6555 case bpf_ctx_range_till(struct __sk_buff
, remote_ip6
[0], remote_ip6
[3]):
6556 case bpf_ctx_range_till(struct __sk_buff
, local_ip6
[0], local_ip6
[3]):
6557 case bpf_ctx_range_till(struct __sk_buff
, remote_ip4
, remote_ip4
):
6558 case bpf_ctx_range_till(struct __sk_buff
, local_ip4
, local_ip4
):
6559 case bpf_ctx_range(struct __sk_buff
, data
):
6560 case bpf_ctx_range(struct __sk_buff
, data_meta
):
6561 case bpf_ctx_range(struct __sk_buff
, data_end
):
6562 if (size
!= size_default
)
6565 case bpf_ctx_range_ptr(struct __sk_buff
, flow_keys
):
6567 case bpf_ctx_range(struct __sk_buff
, tstamp
):
6568 if (size
!= sizeof(__u64
))
6571 case offsetof(struct __sk_buff
, sk
):
6572 if (type
== BPF_WRITE
|| size
!= sizeof(__u64
))
6574 info
->reg_type
= PTR_TO_SOCK_COMMON_OR_NULL
;
6577 /* Only narrow read access allowed for now. */
6578 if (type
== BPF_WRITE
) {
6579 if (size
!= size_default
)
6582 bpf_ctx_record_field_size(info
, size_default
);
6583 if (!bpf_ctx_narrow_access_ok(off
, size
, size_default
))
6591 static bool sk_filter_is_valid_access(int off
, int size
,
6592 enum bpf_access_type type
,
6593 const struct bpf_prog
*prog
,
6594 struct bpf_insn_access_aux
*info
)
6597 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
6598 case bpf_ctx_range(struct __sk_buff
, data
):
6599 case bpf_ctx_range(struct __sk_buff
, data_meta
):
6600 case bpf_ctx_range(struct __sk_buff
, data_end
):
6601 case bpf_ctx_range_till(struct __sk_buff
, family
, local_port
):
6602 case bpf_ctx_range(struct __sk_buff
, tstamp
):
6603 case bpf_ctx_range(struct __sk_buff
, wire_len
):
6607 if (type
== BPF_WRITE
) {
6609 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
6616 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
6619 static bool cg_skb_is_valid_access(int off
, int size
,
6620 enum bpf_access_type type
,
6621 const struct bpf_prog
*prog
,
6622 struct bpf_insn_access_aux
*info
)
6625 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
6626 case bpf_ctx_range(struct __sk_buff
, data_meta
):
6627 case bpf_ctx_range(struct __sk_buff
, wire_len
):
6629 case bpf_ctx_range(struct __sk_buff
, data
):
6630 case bpf_ctx_range(struct __sk_buff
, data_end
):
6631 if (!capable(CAP_SYS_ADMIN
))
6636 if (type
== BPF_WRITE
) {
6638 case bpf_ctx_range(struct __sk_buff
, mark
):
6639 case bpf_ctx_range(struct __sk_buff
, priority
):
6640 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
6642 case bpf_ctx_range(struct __sk_buff
, tstamp
):
6643 if (!capable(CAP_SYS_ADMIN
))
6652 case bpf_ctx_range(struct __sk_buff
, data
):
6653 info
->reg_type
= PTR_TO_PACKET
;
6655 case bpf_ctx_range(struct __sk_buff
, data_end
):
6656 info
->reg_type
= PTR_TO_PACKET_END
;
6660 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
6663 static bool lwt_is_valid_access(int off
, int size
,
6664 enum bpf_access_type type
,
6665 const struct bpf_prog
*prog
,
6666 struct bpf_insn_access_aux
*info
)
6669 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
6670 case bpf_ctx_range_till(struct __sk_buff
, family
, local_port
):
6671 case bpf_ctx_range(struct __sk_buff
, data_meta
):
6672 case bpf_ctx_range(struct __sk_buff
, tstamp
):
6673 case bpf_ctx_range(struct __sk_buff
, wire_len
):
6677 if (type
== BPF_WRITE
) {
6679 case bpf_ctx_range(struct __sk_buff
, mark
):
6680 case bpf_ctx_range(struct __sk_buff
, priority
):
6681 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
6689 case bpf_ctx_range(struct __sk_buff
, data
):
6690 info
->reg_type
= PTR_TO_PACKET
;
6692 case bpf_ctx_range(struct __sk_buff
, data_end
):
6693 info
->reg_type
= PTR_TO_PACKET_END
;
6697 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
6700 /* Attach type specific accesses */
6701 static bool __sock_filter_check_attach_type(int off
,
6702 enum bpf_access_type access_type
,
6703 enum bpf_attach_type attach_type
)
6706 case offsetof(struct bpf_sock
, bound_dev_if
):
6707 case offsetof(struct bpf_sock
, mark
):
6708 case offsetof(struct bpf_sock
, priority
):
6709 switch (attach_type
) {
6710 case BPF_CGROUP_INET_SOCK_CREATE
:
6715 case bpf_ctx_range(struct bpf_sock
, src_ip4
):
6716 switch (attach_type
) {
6717 case BPF_CGROUP_INET4_POST_BIND
:
6722 case bpf_ctx_range_till(struct bpf_sock
, src_ip6
[0], src_ip6
[3]):
6723 switch (attach_type
) {
6724 case BPF_CGROUP_INET6_POST_BIND
:
6729 case bpf_ctx_range(struct bpf_sock
, src_port
):
6730 switch (attach_type
) {
6731 case BPF_CGROUP_INET4_POST_BIND
:
6732 case BPF_CGROUP_INET6_POST_BIND
:
6739 return access_type
== BPF_READ
;
6744 bool bpf_sock_common_is_valid_access(int off
, int size
,
6745 enum bpf_access_type type
,
6746 struct bpf_insn_access_aux
*info
)
6749 case bpf_ctx_range_till(struct bpf_sock
, type
, priority
):
6752 return bpf_sock_is_valid_access(off
, size
, type
, info
);
6756 bool bpf_sock_is_valid_access(int off
, int size
, enum bpf_access_type type
,
6757 struct bpf_insn_access_aux
*info
)
6759 const int size_default
= sizeof(__u32
);
6761 if (off
< 0 || off
>= sizeof(struct bpf_sock
))
6763 if (off
% size
!= 0)
6767 case offsetof(struct bpf_sock
, state
):
6768 case offsetof(struct bpf_sock
, family
):
6769 case offsetof(struct bpf_sock
, type
):
6770 case offsetof(struct bpf_sock
, protocol
):
6771 case offsetof(struct bpf_sock
, dst_port
):
6772 case offsetof(struct bpf_sock
, src_port
):
6773 case bpf_ctx_range(struct bpf_sock
, src_ip4
):
6774 case bpf_ctx_range_till(struct bpf_sock
, src_ip6
[0], src_ip6
[3]):
6775 case bpf_ctx_range(struct bpf_sock
, dst_ip4
):
6776 case bpf_ctx_range_till(struct bpf_sock
, dst_ip6
[0], dst_ip6
[3]):
6777 bpf_ctx_record_field_size(info
, size_default
);
6778 return bpf_ctx_narrow_access_ok(off
, size
, size_default
);
6781 return size
== size_default
;
6784 static bool sock_filter_is_valid_access(int off
, int size
,
6785 enum bpf_access_type type
,
6786 const struct bpf_prog
*prog
,
6787 struct bpf_insn_access_aux
*info
)
6789 if (!bpf_sock_is_valid_access(off
, size
, type
, info
))
6791 return __sock_filter_check_attach_type(off
, type
,
6792 prog
->expected_attach_type
);
6795 static int bpf_noop_prologue(struct bpf_insn
*insn_buf
, bool direct_write
,
6796 const struct bpf_prog
*prog
)
6798 /* Neither direct read nor direct write requires any preliminary
6804 static int bpf_unclone_prologue(struct bpf_insn
*insn_buf
, bool direct_write
,
6805 const struct bpf_prog
*prog
, int drop_verdict
)
6807 struct bpf_insn
*insn
= insn_buf
;
6812 /* if (!skb->cloned)
6815 * (Fast-path, otherwise approximation that we might be
6816 * a clone, do the rest in helper.)
6818 *insn
++ = BPF_LDX_MEM(BPF_B
, BPF_REG_6
, BPF_REG_1
, CLONED_OFFSET());
6819 *insn
++ = BPF_ALU32_IMM(BPF_AND
, BPF_REG_6
, CLONED_MASK
);
6820 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, BPF_REG_6
, 0, 7);
6822 /* ret = bpf_skb_pull_data(skb, 0); */
6823 *insn
++ = BPF_MOV64_REG(BPF_REG_6
, BPF_REG_1
);
6824 *insn
++ = BPF_ALU64_REG(BPF_XOR
, BPF_REG_2
, BPF_REG_2
);
6825 *insn
++ = BPF_RAW_INSN(BPF_JMP
| BPF_CALL
, 0, 0, 0,
6826 BPF_FUNC_skb_pull_data
);
6829 * return TC_ACT_SHOT;
6831 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, BPF_REG_0
, 0, 2);
6832 *insn
++ = BPF_ALU32_IMM(BPF_MOV
, BPF_REG_0
, drop_verdict
);
6833 *insn
++ = BPF_EXIT_INSN();
6836 *insn
++ = BPF_MOV64_REG(BPF_REG_1
, BPF_REG_6
);
6838 *insn
++ = prog
->insnsi
[0];
6840 return insn
- insn_buf
;
6843 static int bpf_gen_ld_abs(const struct bpf_insn
*orig
,
6844 struct bpf_insn
*insn_buf
)
6846 bool indirect
= BPF_MODE(orig
->code
) == BPF_IND
;
6847 struct bpf_insn
*insn
= insn_buf
;
6849 /* We're guaranteed here that CTX is in R6. */
6850 *insn
++ = BPF_MOV64_REG(BPF_REG_1
, BPF_REG_CTX
);
6852 *insn
++ = BPF_MOV64_IMM(BPF_REG_2
, orig
->imm
);
6854 *insn
++ = BPF_MOV64_REG(BPF_REG_2
, orig
->src_reg
);
6856 *insn
++ = BPF_ALU64_IMM(BPF_ADD
, BPF_REG_2
, orig
->imm
);
6859 switch (BPF_SIZE(orig
->code
)) {
6861 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache
);
6864 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache
);
6867 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache
);
6871 *insn
++ = BPF_JMP_IMM(BPF_JSGE
, BPF_REG_0
, 0, 2);
6872 *insn
++ = BPF_ALU32_REG(BPF_XOR
, BPF_REG_0
, BPF_REG_0
);
6873 *insn
++ = BPF_EXIT_INSN();
6875 return insn
- insn_buf
;
6878 static int tc_cls_act_prologue(struct bpf_insn
*insn_buf
, bool direct_write
,
6879 const struct bpf_prog
*prog
)
6881 return bpf_unclone_prologue(insn_buf
, direct_write
, prog
, TC_ACT_SHOT
);
6884 static bool tc_cls_act_is_valid_access(int off
, int size
,
6885 enum bpf_access_type type
,
6886 const struct bpf_prog
*prog
,
6887 struct bpf_insn_access_aux
*info
)
6889 if (type
== BPF_WRITE
) {
6891 case bpf_ctx_range(struct __sk_buff
, mark
):
6892 case bpf_ctx_range(struct __sk_buff
, tc_index
):
6893 case bpf_ctx_range(struct __sk_buff
, priority
):
6894 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
6895 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
6896 case bpf_ctx_range(struct __sk_buff
, tstamp
):
6897 case bpf_ctx_range(struct __sk_buff
, queue_mapping
):
6905 case bpf_ctx_range(struct __sk_buff
, data
):
6906 info
->reg_type
= PTR_TO_PACKET
;
6908 case bpf_ctx_range(struct __sk_buff
, data_meta
):
6909 info
->reg_type
= PTR_TO_PACKET_META
;
6911 case bpf_ctx_range(struct __sk_buff
, data_end
):
6912 info
->reg_type
= PTR_TO_PACKET_END
;
6914 case bpf_ctx_range_till(struct __sk_buff
, family
, local_port
):
6918 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
6921 static bool __is_valid_xdp_access(int off
, int size
)
6923 if (off
< 0 || off
>= sizeof(struct xdp_md
))
6925 if (off
% size
!= 0)
6927 if (size
!= sizeof(__u32
))
6933 static bool xdp_is_valid_access(int off
, int size
,
6934 enum bpf_access_type type
,
6935 const struct bpf_prog
*prog
,
6936 struct bpf_insn_access_aux
*info
)
6938 if (type
== BPF_WRITE
) {
6939 if (bpf_prog_is_dev_bound(prog
->aux
)) {
6941 case offsetof(struct xdp_md
, rx_queue_index
):
6942 return __is_valid_xdp_access(off
, size
);
6949 case offsetof(struct xdp_md
, data
):
6950 info
->reg_type
= PTR_TO_PACKET
;
6952 case offsetof(struct xdp_md
, data_meta
):
6953 info
->reg_type
= PTR_TO_PACKET_META
;
6955 case offsetof(struct xdp_md
, data_end
):
6956 info
->reg_type
= PTR_TO_PACKET_END
;
6960 return __is_valid_xdp_access(off
, size
);
6963 void bpf_warn_invalid_xdp_action(u32 act
)
6965 const u32 act_max
= XDP_REDIRECT
;
6967 WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n",
6968 act
> act_max
? "Illegal" : "Driver unsupported",
6971 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action
);
6973 static bool sock_addr_is_valid_access(int off
, int size
,
6974 enum bpf_access_type type
,
6975 const struct bpf_prog
*prog
,
6976 struct bpf_insn_access_aux
*info
)
6978 const int size_default
= sizeof(__u32
);
6980 if (off
< 0 || off
>= sizeof(struct bpf_sock_addr
))
6982 if (off
% size
!= 0)
6985 /* Disallow access to IPv6 fields from IPv4 contex and vise
6989 case bpf_ctx_range(struct bpf_sock_addr
, user_ip4
):
6990 switch (prog
->expected_attach_type
) {
6991 case BPF_CGROUP_INET4_BIND
:
6992 case BPF_CGROUP_INET4_CONNECT
:
6993 case BPF_CGROUP_UDP4_SENDMSG
:
6994 case BPF_CGROUP_UDP4_RECVMSG
:
7000 case bpf_ctx_range_till(struct bpf_sock_addr
, user_ip6
[0], user_ip6
[3]):
7001 switch (prog
->expected_attach_type
) {
7002 case BPF_CGROUP_INET6_BIND
:
7003 case BPF_CGROUP_INET6_CONNECT
:
7004 case BPF_CGROUP_UDP6_SENDMSG
:
7005 case BPF_CGROUP_UDP6_RECVMSG
:
7011 case bpf_ctx_range(struct bpf_sock_addr
, msg_src_ip4
):
7012 switch (prog
->expected_attach_type
) {
7013 case BPF_CGROUP_UDP4_SENDMSG
:
7019 case bpf_ctx_range_till(struct bpf_sock_addr
, msg_src_ip6
[0],
7021 switch (prog
->expected_attach_type
) {
7022 case BPF_CGROUP_UDP6_SENDMSG
:
7031 case bpf_ctx_range(struct bpf_sock_addr
, user_ip4
):
7032 case bpf_ctx_range_till(struct bpf_sock_addr
, user_ip6
[0], user_ip6
[3]):
7033 case bpf_ctx_range(struct bpf_sock_addr
, msg_src_ip4
):
7034 case bpf_ctx_range_till(struct bpf_sock_addr
, msg_src_ip6
[0],
7036 if (type
== BPF_READ
) {
7037 bpf_ctx_record_field_size(info
, size_default
);
7039 if (bpf_ctx_wide_access_ok(off
, size
,
7040 struct bpf_sock_addr
,
7044 if (bpf_ctx_wide_access_ok(off
, size
,
7045 struct bpf_sock_addr
,
7049 if (!bpf_ctx_narrow_access_ok(off
, size
, size_default
))
7052 if (bpf_ctx_wide_access_ok(off
, size
,
7053 struct bpf_sock_addr
,
7057 if (bpf_ctx_wide_access_ok(off
, size
,
7058 struct bpf_sock_addr
,
7062 if (size
!= size_default
)
7066 case bpf_ctx_range(struct bpf_sock_addr
, user_port
):
7067 if (size
!= size_default
)
7070 case offsetof(struct bpf_sock_addr
, sk
):
7071 if (type
!= BPF_READ
)
7073 if (size
!= sizeof(__u64
))
7075 info
->reg_type
= PTR_TO_SOCKET
;
7078 if (type
== BPF_READ
) {
7079 if (size
!= size_default
)
7089 static bool sock_ops_is_valid_access(int off
, int size
,
7090 enum bpf_access_type type
,
7091 const struct bpf_prog
*prog
,
7092 struct bpf_insn_access_aux
*info
)
7094 const int size_default
= sizeof(__u32
);
7096 if (off
< 0 || off
>= sizeof(struct bpf_sock_ops
))
7099 /* The verifier guarantees that size > 0. */
7100 if (off
% size
!= 0)
7103 if (type
== BPF_WRITE
) {
7105 case offsetof(struct bpf_sock_ops
, reply
):
7106 case offsetof(struct bpf_sock_ops
, sk_txhash
):
7107 if (size
!= size_default
)
7115 case bpf_ctx_range_till(struct bpf_sock_ops
, bytes_received
,
7117 if (size
!= sizeof(__u64
))
7120 case offsetof(struct bpf_sock_ops
, sk
):
7121 if (size
!= sizeof(__u64
))
7123 info
->reg_type
= PTR_TO_SOCKET_OR_NULL
;
7126 if (size
!= size_default
)
7135 static int sk_skb_prologue(struct bpf_insn
*insn_buf
, bool direct_write
,
7136 const struct bpf_prog
*prog
)
7138 return bpf_unclone_prologue(insn_buf
, direct_write
, prog
, SK_DROP
);
7141 static bool sk_skb_is_valid_access(int off
, int size
,
7142 enum bpf_access_type type
,
7143 const struct bpf_prog
*prog
,
7144 struct bpf_insn_access_aux
*info
)
7147 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
7148 case bpf_ctx_range(struct __sk_buff
, data_meta
):
7149 case bpf_ctx_range(struct __sk_buff
, tstamp
):
7150 case bpf_ctx_range(struct __sk_buff
, wire_len
):
7154 if (type
== BPF_WRITE
) {
7156 case bpf_ctx_range(struct __sk_buff
, tc_index
):
7157 case bpf_ctx_range(struct __sk_buff
, priority
):
7165 case bpf_ctx_range(struct __sk_buff
, mark
):
7167 case bpf_ctx_range(struct __sk_buff
, data
):
7168 info
->reg_type
= PTR_TO_PACKET
;
7170 case bpf_ctx_range(struct __sk_buff
, data_end
):
7171 info
->reg_type
= PTR_TO_PACKET_END
;
7175 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
7178 static bool sk_msg_is_valid_access(int off
, int size
,
7179 enum bpf_access_type type
,
7180 const struct bpf_prog
*prog
,
7181 struct bpf_insn_access_aux
*info
)
7183 if (type
== BPF_WRITE
)
7186 if (off
% size
!= 0)
7190 case offsetof(struct sk_msg_md
, data
):
7191 info
->reg_type
= PTR_TO_PACKET
;
7192 if (size
!= sizeof(__u64
))
7195 case offsetof(struct sk_msg_md
, data_end
):
7196 info
->reg_type
= PTR_TO_PACKET_END
;
7197 if (size
!= sizeof(__u64
))
7200 case bpf_ctx_range(struct sk_msg_md
, family
):
7201 case bpf_ctx_range(struct sk_msg_md
, remote_ip4
):
7202 case bpf_ctx_range(struct sk_msg_md
, local_ip4
):
7203 case bpf_ctx_range_till(struct sk_msg_md
, remote_ip6
[0], remote_ip6
[3]):
7204 case bpf_ctx_range_till(struct sk_msg_md
, local_ip6
[0], local_ip6
[3]):
7205 case bpf_ctx_range(struct sk_msg_md
, remote_port
):
7206 case bpf_ctx_range(struct sk_msg_md
, local_port
):
7207 case bpf_ctx_range(struct sk_msg_md
, size
):
7208 if (size
!= sizeof(__u32
))
7217 static bool flow_dissector_is_valid_access(int off
, int size
,
7218 enum bpf_access_type type
,
7219 const struct bpf_prog
*prog
,
7220 struct bpf_insn_access_aux
*info
)
7222 const int size_default
= sizeof(__u32
);
7224 if (off
< 0 || off
>= sizeof(struct __sk_buff
))
7227 if (type
== BPF_WRITE
)
7231 case bpf_ctx_range(struct __sk_buff
, data
):
7232 if (size
!= size_default
)
7234 info
->reg_type
= PTR_TO_PACKET
;
7236 case bpf_ctx_range(struct __sk_buff
, data_end
):
7237 if (size
!= size_default
)
7239 info
->reg_type
= PTR_TO_PACKET_END
;
7241 case bpf_ctx_range_ptr(struct __sk_buff
, flow_keys
):
7242 if (size
!= sizeof(__u64
))
7244 info
->reg_type
= PTR_TO_FLOW_KEYS
;
7251 static u32
flow_dissector_convert_ctx_access(enum bpf_access_type type
,
7252 const struct bpf_insn
*si
,
7253 struct bpf_insn
*insn_buf
,
7254 struct bpf_prog
*prog
,
7258 struct bpf_insn
*insn
= insn_buf
;
7261 case offsetof(struct __sk_buff
, data
):
7262 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector
, data
),
7263 si
->dst_reg
, si
->src_reg
,
7264 offsetof(struct bpf_flow_dissector
, data
));
7267 case offsetof(struct __sk_buff
, data_end
):
7268 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector
, data_end
),
7269 si
->dst_reg
, si
->src_reg
,
7270 offsetof(struct bpf_flow_dissector
, data_end
));
7273 case offsetof(struct __sk_buff
, flow_keys
):
7274 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector
, flow_keys
),
7275 si
->dst_reg
, si
->src_reg
,
7276 offsetof(struct bpf_flow_dissector
, flow_keys
));
7280 return insn
- insn_buf
;
7283 static struct bpf_insn
*bpf_convert_shinfo_access(const struct bpf_insn
*si
,
7284 struct bpf_insn
*insn
)
7286 /* si->dst_reg = skb_shinfo(SKB); */
7287 #ifdef NET_SKBUFF_DATA_USES_OFFSET
7288 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, end
),
7289 BPF_REG_AX
, si
->src_reg
,
7290 offsetof(struct sk_buff
, end
));
7291 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, head
),
7292 si
->dst_reg
, si
->src_reg
,
7293 offsetof(struct sk_buff
, head
));
7294 *insn
++ = BPF_ALU64_REG(BPF_ADD
, si
->dst_reg
, BPF_REG_AX
);
7296 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, end
),
7297 si
->dst_reg
, si
->src_reg
,
7298 offsetof(struct sk_buff
, end
));
7304 static u32
bpf_convert_ctx_access(enum bpf_access_type type
,
7305 const struct bpf_insn
*si
,
7306 struct bpf_insn
*insn_buf
,
7307 struct bpf_prog
*prog
, u32
*target_size
)
7309 struct bpf_insn
*insn
= insn_buf
;
7313 case offsetof(struct __sk_buff
, len
):
7314 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7315 bpf_target_off(struct sk_buff
, len
, 4,
7319 case offsetof(struct __sk_buff
, protocol
):
7320 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
7321 bpf_target_off(struct sk_buff
, protocol
, 2,
7325 case offsetof(struct __sk_buff
, vlan_proto
):
7326 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
7327 bpf_target_off(struct sk_buff
, vlan_proto
, 2,
7331 case offsetof(struct __sk_buff
, priority
):
7332 if (type
== BPF_WRITE
)
7333 *insn
++ = BPF_STX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7334 bpf_target_off(struct sk_buff
, priority
, 4,
7337 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7338 bpf_target_off(struct sk_buff
, priority
, 4,
7342 case offsetof(struct __sk_buff
, ingress_ifindex
):
7343 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7344 bpf_target_off(struct sk_buff
, skb_iif
, 4,
7348 case offsetof(struct __sk_buff
, ifindex
):
7349 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, dev
),
7350 si
->dst_reg
, si
->src_reg
,
7351 offsetof(struct sk_buff
, dev
));
7352 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, si
->dst_reg
, 0, 1);
7353 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7354 bpf_target_off(struct net_device
, ifindex
, 4,
7358 case offsetof(struct __sk_buff
, hash
):
7359 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7360 bpf_target_off(struct sk_buff
, hash
, 4,
7364 case offsetof(struct __sk_buff
, mark
):
7365 if (type
== BPF_WRITE
)
7366 *insn
++ = BPF_STX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7367 bpf_target_off(struct sk_buff
, mark
, 4,
7370 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7371 bpf_target_off(struct sk_buff
, mark
, 4,
7375 case offsetof(struct __sk_buff
, pkt_type
):
7377 *insn
++ = BPF_LDX_MEM(BPF_B
, si
->dst_reg
, si
->src_reg
,
7379 *insn
++ = BPF_ALU32_IMM(BPF_AND
, si
->dst_reg
, PKT_TYPE_MAX
);
7380 #ifdef __BIG_ENDIAN_BITFIELD
7381 *insn
++ = BPF_ALU32_IMM(BPF_RSH
, si
->dst_reg
, 5);
7385 case offsetof(struct __sk_buff
, queue_mapping
):
7386 if (type
== BPF_WRITE
) {
7387 *insn
++ = BPF_JMP_IMM(BPF_JGE
, si
->src_reg
, NO_QUEUE_MAPPING
, 1);
7388 *insn
++ = BPF_STX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
7389 bpf_target_off(struct sk_buff
,
7393 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
7394 bpf_target_off(struct sk_buff
,
7400 case offsetof(struct __sk_buff
, vlan_present
):
7402 *insn
++ = BPF_LDX_MEM(BPF_B
, si
->dst_reg
, si
->src_reg
,
7403 PKT_VLAN_PRESENT_OFFSET());
7404 if (PKT_VLAN_PRESENT_BIT
)
7405 *insn
++ = BPF_ALU32_IMM(BPF_RSH
, si
->dst_reg
, PKT_VLAN_PRESENT_BIT
);
7406 if (PKT_VLAN_PRESENT_BIT
< 7)
7407 *insn
++ = BPF_ALU32_IMM(BPF_AND
, si
->dst_reg
, 1);
7410 case offsetof(struct __sk_buff
, vlan_tci
):
7411 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
7412 bpf_target_off(struct sk_buff
, vlan_tci
, 2,
7416 case offsetof(struct __sk_buff
, cb
[0]) ...
7417 offsetofend(struct __sk_buff
, cb
[4]) - 1:
7418 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb
, data
) < 20);
7419 BUILD_BUG_ON((offsetof(struct sk_buff
, cb
) +
7420 offsetof(struct qdisc_skb_cb
, data
)) %
7423 prog
->cb_access
= 1;
7425 off
-= offsetof(struct __sk_buff
, cb
[0]);
7426 off
+= offsetof(struct sk_buff
, cb
);
7427 off
+= offsetof(struct qdisc_skb_cb
, data
);
7428 if (type
== BPF_WRITE
)
7429 *insn
++ = BPF_STX_MEM(BPF_SIZE(si
->code
), si
->dst_reg
,
7432 *insn
++ = BPF_LDX_MEM(BPF_SIZE(si
->code
), si
->dst_reg
,
7436 case offsetof(struct __sk_buff
, tc_classid
):
7437 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb
, tc_classid
) != 2);
7440 off
-= offsetof(struct __sk_buff
, tc_classid
);
7441 off
+= offsetof(struct sk_buff
, cb
);
7442 off
+= offsetof(struct qdisc_skb_cb
, tc_classid
);
7444 if (type
== BPF_WRITE
)
7445 *insn
++ = BPF_STX_MEM(BPF_H
, si
->dst_reg
,
7448 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
,
7452 case offsetof(struct __sk_buff
, data
):
7453 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, data
),
7454 si
->dst_reg
, si
->src_reg
,
7455 offsetof(struct sk_buff
, data
));
7458 case offsetof(struct __sk_buff
, data_meta
):
7460 off
-= offsetof(struct __sk_buff
, data_meta
);
7461 off
+= offsetof(struct sk_buff
, cb
);
7462 off
+= offsetof(struct bpf_skb_data_end
, data_meta
);
7463 *insn
++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si
->dst_reg
,
7467 case offsetof(struct __sk_buff
, data_end
):
7469 off
-= offsetof(struct __sk_buff
, data_end
);
7470 off
+= offsetof(struct sk_buff
, cb
);
7471 off
+= offsetof(struct bpf_skb_data_end
, data_end
);
7472 *insn
++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si
->dst_reg
,
7476 case offsetof(struct __sk_buff
, tc_index
):
7477 #ifdef CONFIG_NET_SCHED
7478 if (type
== BPF_WRITE
)
7479 *insn
++ = BPF_STX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
7480 bpf_target_off(struct sk_buff
, tc_index
, 2,
7483 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
7484 bpf_target_off(struct sk_buff
, tc_index
, 2,
7488 if (type
== BPF_WRITE
)
7489 *insn
++ = BPF_MOV64_REG(si
->dst_reg
, si
->dst_reg
);
7491 *insn
++ = BPF_MOV64_IMM(si
->dst_reg
, 0);
7495 case offsetof(struct __sk_buff
, napi_id
):
7496 #if defined(CONFIG_NET_RX_BUSY_POLL)
7497 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7498 bpf_target_off(struct sk_buff
, napi_id
, 4,
7500 *insn
++ = BPF_JMP_IMM(BPF_JGE
, si
->dst_reg
, MIN_NAPI_ID
, 1);
7501 *insn
++ = BPF_MOV64_IMM(si
->dst_reg
, 0);
7504 *insn
++ = BPF_MOV64_IMM(si
->dst_reg
, 0);
7507 case offsetof(struct __sk_buff
, family
):
7508 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_family
) != 2);
7510 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
7511 si
->dst_reg
, si
->src_reg
,
7512 offsetof(struct sk_buff
, sk
));
7513 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
7514 bpf_target_off(struct sock_common
,
7518 case offsetof(struct __sk_buff
, remote_ip4
):
7519 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_daddr
) != 4);
7521 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
7522 si
->dst_reg
, si
->src_reg
,
7523 offsetof(struct sk_buff
, sk
));
7524 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7525 bpf_target_off(struct sock_common
,
7529 case offsetof(struct __sk_buff
, local_ip4
):
7530 BUILD_BUG_ON(sizeof_field(struct sock_common
,
7531 skc_rcv_saddr
) != 4);
7533 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
7534 si
->dst_reg
, si
->src_reg
,
7535 offsetof(struct sk_buff
, sk
));
7536 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7537 bpf_target_off(struct sock_common
,
7541 case offsetof(struct __sk_buff
, remote_ip6
[0]) ...
7542 offsetof(struct __sk_buff
, remote_ip6
[3]):
7543 #if IS_ENABLED(CONFIG_IPV6)
7544 BUILD_BUG_ON(sizeof_field(struct sock_common
,
7545 skc_v6_daddr
.s6_addr32
[0]) != 4);
7548 off
-= offsetof(struct __sk_buff
, remote_ip6
[0]);
7550 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
7551 si
->dst_reg
, si
->src_reg
,
7552 offsetof(struct sk_buff
, sk
));
7553 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7554 offsetof(struct sock_common
,
7555 skc_v6_daddr
.s6_addr32
[0]) +
7558 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
7561 case offsetof(struct __sk_buff
, local_ip6
[0]) ...
7562 offsetof(struct __sk_buff
, local_ip6
[3]):
7563 #if IS_ENABLED(CONFIG_IPV6)
7564 BUILD_BUG_ON(sizeof_field(struct sock_common
,
7565 skc_v6_rcv_saddr
.s6_addr32
[0]) != 4);
7568 off
-= offsetof(struct __sk_buff
, local_ip6
[0]);
7570 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
7571 si
->dst_reg
, si
->src_reg
,
7572 offsetof(struct sk_buff
, sk
));
7573 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7574 offsetof(struct sock_common
,
7575 skc_v6_rcv_saddr
.s6_addr32
[0]) +
7578 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
7582 case offsetof(struct __sk_buff
, remote_port
):
7583 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_dport
) != 2);
7585 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
7586 si
->dst_reg
, si
->src_reg
,
7587 offsetof(struct sk_buff
, sk
));
7588 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
7589 bpf_target_off(struct sock_common
,
7592 #ifndef __BIG_ENDIAN_BITFIELD
7593 *insn
++ = BPF_ALU32_IMM(BPF_LSH
, si
->dst_reg
, 16);
7597 case offsetof(struct __sk_buff
, local_port
):
7598 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_num
) != 2);
7600 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
7601 si
->dst_reg
, si
->src_reg
,
7602 offsetof(struct sk_buff
, sk
));
7603 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
7604 bpf_target_off(struct sock_common
,
7605 skc_num
, 2, target_size
));
7608 case offsetof(struct __sk_buff
, tstamp
):
7609 BUILD_BUG_ON(sizeof_field(struct sk_buff
, tstamp
) != 8);
7611 if (type
== BPF_WRITE
)
7612 *insn
++ = BPF_STX_MEM(BPF_DW
,
7613 si
->dst_reg
, si
->src_reg
,
7614 bpf_target_off(struct sk_buff
,
7618 *insn
++ = BPF_LDX_MEM(BPF_DW
,
7619 si
->dst_reg
, si
->src_reg
,
7620 bpf_target_off(struct sk_buff
,
7625 case offsetof(struct __sk_buff
, gso_segs
):
7626 insn
= bpf_convert_shinfo_access(si
, insn
);
7627 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info
, gso_segs
),
7628 si
->dst_reg
, si
->dst_reg
,
7629 bpf_target_off(struct skb_shared_info
,
7633 case offsetof(struct __sk_buff
, gso_size
):
7634 insn
= bpf_convert_shinfo_access(si
, insn
);
7635 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info
, gso_size
),
7636 si
->dst_reg
, si
->dst_reg
,
7637 bpf_target_off(struct skb_shared_info
,
7641 case offsetof(struct __sk_buff
, wire_len
):
7642 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb
, pkt_len
) != 4);
7645 off
-= offsetof(struct __sk_buff
, wire_len
);
7646 off
+= offsetof(struct sk_buff
, cb
);
7647 off
+= offsetof(struct qdisc_skb_cb
, pkt_len
);
7649 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
, off
);
7652 case offsetof(struct __sk_buff
, sk
):
7653 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
7654 si
->dst_reg
, si
->src_reg
,
7655 offsetof(struct sk_buff
, sk
));
7659 return insn
- insn_buf
;
7662 u32
bpf_sock_convert_ctx_access(enum bpf_access_type type
,
7663 const struct bpf_insn
*si
,
7664 struct bpf_insn
*insn_buf
,
7665 struct bpf_prog
*prog
, u32
*target_size
)
7667 struct bpf_insn
*insn
= insn_buf
;
7671 case offsetof(struct bpf_sock
, bound_dev_if
):
7672 BUILD_BUG_ON(sizeof_field(struct sock
, sk_bound_dev_if
) != 4);
7674 if (type
== BPF_WRITE
)
7675 *insn
++ = BPF_STX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7676 offsetof(struct sock
, sk_bound_dev_if
));
7678 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7679 offsetof(struct sock
, sk_bound_dev_if
));
7682 case offsetof(struct bpf_sock
, mark
):
7683 BUILD_BUG_ON(sizeof_field(struct sock
, sk_mark
) != 4);
7685 if (type
== BPF_WRITE
)
7686 *insn
++ = BPF_STX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7687 offsetof(struct sock
, sk_mark
));
7689 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7690 offsetof(struct sock
, sk_mark
));
7693 case offsetof(struct bpf_sock
, priority
):
7694 BUILD_BUG_ON(sizeof_field(struct sock
, sk_priority
) != 4);
7696 if (type
== BPF_WRITE
)
7697 *insn
++ = BPF_STX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7698 offsetof(struct sock
, sk_priority
));
7700 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7701 offsetof(struct sock
, sk_priority
));
7704 case offsetof(struct bpf_sock
, family
):
7705 *insn
++ = BPF_LDX_MEM(
7706 BPF_FIELD_SIZEOF(struct sock_common
, skc_family
),
7707 si
->dst_reg
, si
->src_reg
,
7708 bpf_target_off(struct sock_common
,
7710 sizeof_field(struct sock_common
,
7715 case offsetof(struct bpf_sock
, type
):
7716 *insn
++ = BPF_LDX_MEM(
7717 BPF_FIELD_SIZEOF(struct sock
, sk_type
),
7718 si
->dst_reg
, si
->src_reg
,
7719 bpf_target_off(struct sock
, sk_type
,
7720 sizeof_field(struct sock
, sk_type
),
7724 case offsetof(struct bpf_sock
, protocol
):
7725 *insn
++ = BPF_LDX_MEM(
7726 BPF_FIELD_SIZEOF(struct sock
, sk_protocol
),
7727 si
->dst_reg
, si
->src_reg
,
7728 bpf_target_off(struct sock
, sk_protocol
,
7729 sizeof_field(struct sock
, sk_protocol
),
7733 case offsetof(struct bpf_sock
, src_ip4
):
7734 *insn
++ = BPF_LDX_MEM(
7735 BPF_SIZE(si
->code
), si
->dst_reg
, si
->src_reg
,
7736 bpf_target_off(struct sock_common
, skc_rcv_saddr
,
7737 sizeof_field(struct sock_common
,
7742 case offsetof(struct bpf_sock
, dst_ip4
):
7743 *insn
++ = BPF_LDX_MEM(
7744 BPF_SIZE(si
->code
), si
->dst_reg
, si
->src_reg
,
7745 bpf_target_off(struct sock_common
, skc_daddr
,
7746 sizeof_field(struct sock_common
,
7751 case bpf_ctx_range_till(struct bpf_sock
, src_ip6
[0], src_ip6
[3]):
7752 #if IS_ENABLED(CONFIG_IPV6)
7754 off
-= offsetof(struct bpf_sock
, src_ip6
[0]);
7755 *insn
++ = BPF_LDX_MEM(
7756 BPF_SIZE(si
->code
), si
->dst_reg
, si
->src_reg
,
7759 skc_v6_rcv_saddr
.s6_addr32
[0],
7760 sizeof_field(struct sock_common
,
7761 skc_v6_rcv_saddr
.s6_addr32
[0]),
7762 target_size
) + off
);
7765 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
7769 case bpf_ctx_range_till(struct bpf_sock
, dst_ip6
[0], dst_ip6
[3]):
7770 #if IS_ENABLED(CONFIG_IPV6)
7772 off
-= offsetof(struct bpf_sock
, dst_ip6
[0]);
7773 *insn
++ = BPF_LDX_MEM(
7774 BPF_SIZE(si
->code
), si
->dst_reg
, si
->src_reg
,
7775 bpf_target_off(struct sock_common
,
7776 skc_v6_daddr
.s6_addr32
[0],
7777 sizeof_field(struct sock_common
,
7778 skc_v6_daddr
.s6_addr32
[0]),
7779 target_size
) + off
);
7781 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
7786 case offsetof(struct bpf_sock
, src_port
):
7787 *insn
++ = BPF_LDX_MEM(
7788 BPF_FIELD_SIZEOF(struct sock_common
, skc_num
),
7789 si
->dst_reg
, si
->src_reg
,
7790 bpf_target_off(struct sock_common
, skc_num
,
7791 sizeof_field(struct sock_common
,
7796 case offsetof(struct bpf_sock
, dst_port
):
7797 *insn
++ = BPF_LDX_MEM(
7798 BPF_FIELD_SIZEOF(struct sock_common
, skc_dport
),
7799 si
->dst_reg
, si
->src_reg
,
7800 bpf_target_off(struct sock_common
, skc_dport
,
7801 sizeof_field(struct sock_common
,
7806 case offsetof(struct bpf_sock
, state
):
7807 *insn
++ = BPF_LDX_MEM(
7808 BPF_FIELD_SIZEOF(struct sock_common
, skc_state
),
7809 si
->dst_reg
, si
->src_reg
,
7810 bpf_target_off(struct sock_common
, skc_state
,
7811 sizeof_field(struct sock_common
,
7817 return insn
- insn_buf
;
7820 static u32
tc_cls_act_convert_ctx_access(enum bpf_access_type type
,
7821 const struct bpf_insn
*si
,
7822 struct bpf_insn
*insn_buf
,
7823 struct bpf_prog
*prog
, u32
*target_size
)
7825 struct bpf_insn
*insn
= insn_buf
;
7828 case offsetof(struct __sk_buff
, ifindex
):
7829 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, dev
),
7830 si
->dst_reg
, si
->src_reg
,
7831 offsetof(struct sk_buff
, dev
));
7832 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7833 bpf_target_off(struct net_device
, ifindex
, 4,
7837 return bpf_convert_ctx_access(type
, si
, insn_buf
, prog
,
7841 return insn
- insn_buf
;
7844 static u32
xdp_convert_ctx_access(enum bpf_access_type type
,
7845 const struct bpf_insn
*si
,
7846 struct bpf_insn
*insn_buf
,
7847 struct bpf_prog
*prog
, u32
*target_size
)
7849 struct bpf_insn
*insn
= insn_buf
;
7852 case offsetof(struct xdp_md
, data
):
7853 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, data
),
7854 si
->dst_reg
, si
->src_reg
,
7855 offsetof(struct xdp_buff
, data
));
7857 case offsetof(struct xdp_md
, data_meta
):
7858 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, data_meta
),
7859 si
->dst_reg
, si
->src_reg
,
7860 offsetof(struct xdp_buff
, data_meta
));
7862 case offsetof(struct xdp_md
, data_end
):
7863 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, data_end
),
7864 si
->dst_reg
, si
->src_reg
,
7865 offsetof(struct xdp_buff
, data_end
));
7867 case offsetof(struct xdp_md
, ingress_ifindex
):
7868 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, rxq
),
7869 si
->dst_reg
, si
->src_reg
,
7870 offsetof(struct xdp_buff
, rxq
));
7871 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info
, dev
),
7872 si
->dst_reg
, si
->dst_reg
,
7873 offsetof(struct xdp_rxq_info
, dev
));
7874 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7875 offsetof(struct net_device
, ifindex
));
7877 case offsetof(struct xdp_md
, rx_queue_index
):
7878 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, rxq
),
7879 si
->dst_reg
, si
->src_reg
,
7880 offsetof(struct xdp_buff
, rxq
));
7881 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7882 offsetof(struct xdp_rxq_info
,
7887 return insn
- insn_buf
;
7890 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of
7891 * context Structure, F is Field in context structure that contains a pointer
7892 * to Nested Structure of type NS that has the field NF.
7894 * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make
7895 * sure that SIZE is not greater than actual size of S.F.NF.
7897 * If offset OFF is provided, the load happens from that offset relative to
7900 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \
7902 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \
7903 si->src_reg, offsetof(S, F)); \
7904 *insn++ = BPF_LDX_MEM( \
7905 SIZE, si->dst_reg, si->dst_reg, \
7906 bpf_target_off(NS, NF, sizeof_field(NS, NF), \
7911 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \
7912 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \
7913 BPF_FIELD_SIZEOF(NS, NF), 0)
7915 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to
7916 * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation.
7918 * In addition it uses Temporary Field TF (member of struct S) as the 3rd
7919 * "register" since two registers available in convert_ctx_access are not
7920 * enough: we can't override neither SRC, since it contains value to store, nor
7921 * DST since it contains pointer to context that may be used by later
7922 * instructions. But we need a temporary place to save pointer to nested
7923 * structure whose field we want to store to.
7925 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF) \
7927 int tmp_reg = BPF_REG_9; \
7928 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \
7930 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \
7932 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \
7934 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \
7935 si->dst_reg, offsetof(S, F)); \
7936 *insn++ = BPF_STX_MEM(SIZE, tmp_reg, si->src_reg, \
7937 bpf_target_off(NS, NF, sizeof_field(NS, NF), \
7940 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \
7944 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \
7947 if (type == BPF_WRITE) { \
7948 SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, \
7951 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \
7952 S, NS, F, NF, SIZE, OFF); \
7956 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \
7957 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \
7958 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF)
7960 static u32
sock_addr_convert_ctx_access(enum bpf_access_type type
,
7961 const struct bpf_insn
*si
,
7962 struct bpf_insn
*insn_buf
,
7963 struct bpf_prog
*prog
, u32
*target_size
)
7965 struct bpf_insn
*insn
= insn_buf
;
7969 case offsetof(struct bpf_sock_addr
, user_family
):
7970 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern
,
7971 struct sockaddr
, uaddr
, sa_family
);
7974 case offsetof(struct bpf_sock_addr
, user_ip4
):
7975 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
7976 struct bpf_sock_addr_kern
, struct sockaddr_in
, uaddr
,
7977 sin_addr
, BPF_SIZE(si
->code
), 0, tmp_reg
);
7980 case bpf_ctx_range_till(struct bpf_sock_addr
, user_ip6
[0], user_ip6
[3]):
7982 off
-= offsetof(struct bpf_sock_addr
, user_ip6
[0]);
7983 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
7984 struct bpf_sock_addr_kern
, struct sockaddr_in6
, uaddr
,
7985 sin6_addr
.s6_addr32
[0], BPF_SIZE(si
->code
), off
,
7989 case offsetof(struct bpf_sock_addr
, user_port
):
7990 /* To get port we need to know sa_family first and then treat
7991 * sockaddr as either sockaddr_in or sockaddr_in6.
7992 * Though we can simplify since port field has same offset and
7993 * size in both structures.
7994 * Here we check this invariant and use just one of the
7995 * structures if it's true.
7997 BUILD_BUG_ON(offsetof(struct sockaddr_in
, sin_port
) !=
7998 offsetof(struct sockaddr_in6
, sin6_port
));
7999 BUILD_BUG_ON(sizeof_field(struct sockaddr_in
, sin_port
) !=
8000 sizeof_field(struct sockaddr_in6
, sin6_port
));
8001 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(struct bpf_sock_addr_kern
,
8002 struct sockaddr_in6
, uaddr
,
8003 sin6_port
, tmp_reg
);
8006 case offsetof(struct bpf_sock_addr
, family
):
8007 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern
,
8008 struct sock
, sk
, sk_family
);
8011 case offsetof(struct bpf_sock_addr
, type
):
8012 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern
,
8013 struct sock
, sk
, sk_type
);
8016 case offsetof(struct bpf_sock_addr
, protocol
):
8017 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern
,
8018 struct sock
, sk
, sk_protocol
);
8021 case offsetof(struct bpf_sock_addr
, msg_src_ip4
):
8022 /* Treat t_ctx as struct in_addr for msg_src_ip4. */
8023 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
8024 struct bpf_sock_addr_kern
, struct in_addr
, t_ctx
,
8025 s_addr
, BPF_SIZE(si
->code
), 0, tmp_reg
);
8028 case bpf_ctx_range_till(struct bpf_sock_addr
, msg_src_ip6
[0],
8031 off
-= offsetof(struct bpf_sock_addr
, msg_src_ip6
[0]);
8032 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */
8033 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
8034 struct bpf_sock_addr_kern
, struct in6_addr
, t_ctx
,
8035 s6_addr32
[0], BPF_SIZE(si
->code
), off
, tmp_reg
);
8037 case offsetof(struct bpf_sock_addr
, sk
):
8038 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern
, sk
),
8039 si
->dst_reg
, si
->src_reg
,
8040 offsetof(struct bpf_sock_addr_kern
, sk
));
8044 return insn
- insn_buf
;
8047 static u32
sock_ops_convert_ctx_access(enum bpf_access_type type
,
8048 const struct bpf_insn
*si
,
8049 struct bpf_insn
*insn_buf
,
8050 struct bpf_prog
*prog
,
8053 struct bpf_insn
*insn
= insn_buf
;
8056 /* Helper macro for adding read access to tcp_sock or sock fields. */
8057 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
8059 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \
8060 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \
8061 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
8062 struct bpf_sock_ops_kern, \
8064 si->dst_reg, si->src_reg, \
8065 offsetof(struct bpf_sock_ops_kern, \
8067 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 2); \
8068 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
8069 struct bpf_sock_ops_kern, sk),\
8070 si->dst_reg, si->src_reg, \
8071 offsetof(struct bpf_sock_ops_kern, sk));\
8072 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \
8074 si->dst_reg, si->dst_reg, \
8075 offsetof(OBJ, OBJ_FIELD)); \
8078 #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \
8079 SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock)
8081 /* Helper macro for adding write access to tcp_sock or sock fields.
8082 * The macro is called with two registers, dst_reg which contains a pointer
8083 * to ctx (context) and src_reg which contains the value that should be
8084 * stored. However, we need an additional register since we cannot overwrite
8085 * dst_reg because it may be used later in the program.
8086 * Instead we "borrow" one of the other register. We first save its value
8087 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore
8088 * it at the end of the macro.
8090 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
8092 int reg = BPF_REG_9; \
8093 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \
8094 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \
8095 if (si->dst_reg == reg || si->src_reg == reg) \
8097 if (si->dst_reg == reg || si->src_reg == reg) \
8099 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \
8100 offsetof(struct bpf_sock_ops_kern, \
8102 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
8103 struct bpf_sock_ops_kern, \
8106 offsetof(struct bpf_sock_ops_kern, \
8108 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \
8109 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
8110 struct bpf_sock_ops_kern, sk),\
8112 offsetof(struct bpf_sock_ops_kern, sk));\
8113 *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD), \
8115 offsetof(OBJ, OBJ_FIELD)); \
8116 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \
8117 offsetof(struct bpf_sock_ops_kern, \
8121 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \
8123 if (TYPE == BPF_WRITE) \
8124 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \
8126 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \
8129 if (insn
> insn_buf
)
8130 return insn
- insn_buf
;
8133 case offsetof(struct bpf_sock_ops
, op
) ...
8134 offsetof(struct bpf_sock_ops
, replylong
[3]):
8135 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops
, op
) !=
8136 sizeof_field(struct bpf_sock_ops_kern
, op
));
8137 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops
, reply
) !=
8138 sizeof_field(struct bpf_sock_ops_kern
, reply
));
8139 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops
, replylong
) !=
8140 sizeof_field(struct bpf_sock_ops_kern
, replylong
));
8142 off
-= offsetof(struct bpf_sock_ops
, op
);
8143 off
+= offsetof(struct bpf_sock_ops_kern
, op
);
8144 if (type
== BPF_WRITE
)
8145 *insn
++ = BPF_STX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
8148 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
8152 case offsetof(struct bpf_sock_ops
, family
):
8153 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_family
) != 2);
8155 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8156 struct bpf_sock_ops_kern
, sk
),
8157 si
->dst_reg
, si
->src_reg
,
8158 offsetof(struct bpf_sock_ops_kern
, sk
));
8159 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
8160 offsetof(struct sock_common
, skc_family
));
8163 case offsetof(struct bpf_sock_ops
, remote_ip4
):
8164 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_daddr
) != 4);
8166 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8167 struct bpf_sock_ops_kern
, sk
),
8168 si
->dst_reg
, si
->src_reg
,
8169 offsetof(struct bpf_sock_ops_kern
, sk
));
8170 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
8171 offsetof(struct sock_common
, skc_daddr
));
8174 case offsetof(struct bpf_sock_ops
, local_ip4
):
8175 BUILD_BUG_ON(sizeof_field(struct sock_common
,
8176 skc_rcv_saddr
) != 4);
8178 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8179 struct bpf_sock_ops_kern
, sk
),
8180 si
->dst_reg
, si
->src_reg
,
8181 offsetof(struct bpf_sock_ops_kern
, sk
));
8182 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
8183 offsetof(struct sock_common
,
8187 case offsetof(struct bpf_sock_ops
, remote_ip6
[0]) ...
8188 offsetof(struct bpf_sock_ops
, remote_ip6
[3]):
8189 #if IS_ENABLED(CONFIG_IPV6)
8190 BUILD_BUG_ON(sizeof_field(struct sock_common
,
8191 skc_v6_daddr
.s6_addr32
[0]) != 4);
8194 off
-= offsetof(struct bpf_sock_ops
, remote_ip6
[0]);
8195 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8196 struct bpf_sock_ops_kern
, sk
),
8197 si
->dst_reg
, si
->src_reg
,
8198 offsetof(struct bpf_sock_ops_kern
, sk
));
8199 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
8200 offsetof(struct sock_common
,
8201 skc_v6_daddr
.s6_addr32
[0]) +
8204 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
8208 case offsetof(struct bpf_sock_ops
, local_ip6
[0]) ...
8209 offsetof(struct bpf_sock_ops
, local_ip6
[3]):
8210 #if IS_ENABLED(CONFIG_IPV6)
8211 BUILD_BUG_ON(sizeof_field(struct sock_common
,
8212 skc_v6_rcv_saddr
.s6_addr32
[0]) != 4);
8215 off
-= offsetof(struct bpf_sock_ops
, local_ip6
[0]);
8216 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8217 struct bpf_sock_ops_kern
, sk
),
8218 si
->dst_reg
, si
->src_reg
,
8219 offsetof(struct bpf_sock_ops_kern
, sk
));
8220 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
8221 offsetof(struct sock_common
,
8222 skc_v6_rcv_saddr
.s6_addr32
[0]) +
8225 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
8229 case offsetof(struct bpf_sock_ops
, remote_port
):
8230 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_dport
) != 2);
8232 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8233 struct bpf_sock_ops_kern
, sk
),
8234 si
->dst_reg
, si
->src_reg
,
8235 offsetof(struct bpf_sock_ops_kern
, sk
));
8236 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
8237 offsetof(struct sock_common
, skc_dport
));
8238 #ifndef __BIG_ENDIAN_BITFIELD
8239 *insn
++ = BPF_ALU32_IMM(BPF_LSH
, si
->dst_reg
, 16);
8243 case offsetof(struct bpf_sock_ops
, local_port
):
8244 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_num
) != 2);
8246 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8247 struct bpf_sock_ops_kern
, sk
),
8248 si
->dst_reg
, si
->src_reg
,
8249 offsetof(struct bpf_sock_ops_kern
, sk
));
8250 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
8251 offsetof(struct sock_common
, skc_num
));
8254 case offsetof(struct bpf_sock_ops
, is_fullsock
):
8255 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8256 struct bpf_sock_ops_kern
,
8258 si
->dst_reg
, si
->src_reg
,
8259 offsetof(struct bpf_sock_ops_kern
,
8263 case offsetof(struct bpf_sock_ops
, state
):
8264 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_state
) != 1);
8266 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8267 struct bpf_sock_ops_kern
, sk
),
8268 si
->dst_reg
, si
->src_reg
,
8269 offsetof(struct bpf_sock_ops_kern
, sk
));
8270 *insn
++ = BPF_LDX_MEM(BPF_B
, si
->dst_reg
, si
->dst_reg
,
8271 offsetof(struct sock_common
, skc_state
));
8274 case offsetof(struct bpf_sock_ops
, rtt_min
):
8275 BUILD_BUG_ON(sizeof_field(struct tcp_sock
, rtt_min
) !=
8276 sizeof(struct minmax
));
8277 BUILD_BUG_ON(sizeof(struct minmax
) <
8278 sizeof(struct minmax_sample
));
8280 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8281 struct bpf_sock_ops_kern
, sk
),
8282 si
->dst_reg
, si
->src_reg
,
8283 offsetof(struct bpf_sock_ops_kern
, sk
));
8284 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
8285 offsetof(struct tcp_sock
, rtt_min
) +
8286 sizeof_field(struct minmax_sample
, t
));
8289 case offsetof(struct bpf_sock_ops
, bpf_sock_ops_cb_flags
):
8290 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags
, bpf_sock_ops_cb_flags
,
8294 case offsetof(struct bpf_sock_ops
, sk_txhash
):
8295 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash
, sk_txhash
,
8298 case offsetof(struct bpf_sock_ops
, snd_cwnd
):
8299 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd
);
8301 case offsetof(struct bpf_sock_ops
, srtt_us
):
8302 SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us
);
8304 case offsetof(struct bpf_sock_ops
, snd_ssthresh
):
8305 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh
);
8307 case offsetof(struct bpf_sock_ops
, rcv_nxt
):
8308 SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt
);
8310 case offsetof(struct bpf_sock_ops
, snd_nxt
):
8311 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt
);
8313 case offsetof(struct bpf_sock_ops
, snd_una
):
8314 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una
);
8316 case offsetof(struct bpf_sock_ops
, mss_cache
):
8317 SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache
);
8319 case offsetof(struct bpf_sock_ops
, ecn_flags
):
8320 SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags
);
8322 case offsetof(struct bpf_sock_ops
, rate_delivered
):
8323 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered
);
8325 case offsetof(struct bpf_sock_ops
, rate_interval_us
):
8326 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us
);
8328 case offsetof(struct bpf_sock_ops
, packets_out
):
8329 SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out
);
8331 case offsetof(struct bpf_sock_ops
, retrans_out
):
8332 SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out
);
8334 case offsetof(struct bpf_sock_ops
, total_retrans
):
8335 SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans
);
8337 case offsetof(struct bpf_sock_ops
, segs_in
):
8338 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in
);
8340 case offsetof(struct bpf_sock_ops
, data_segs_in
):
8341 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in
);
8343 case offsetof(struct bpf_sock_ops
, segs_out
):
8344 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out
);
8346 case offsetof(struct bpf_sock_ops
, data_segs_out
):
8347 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out
);
8349 case offsetof(struct bpf_sock_ops
, lost_out
):
8350 SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out
);
8352 case offsetof(struct bpf_sock_ops
, sacked_out
):
8353 SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out
);
8355 case offsetof(struct bpf_sock_ops
, bytes_received
):
8356 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received
);
8358 case offsetof(struct bpf_sock_ops
, bytes_acked
):
8359 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked
);
8361 case offsetof(struct bpf_sock_ops
, sk
):
8362 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8363 struct bpf_sock_ops_kern
,
8365 si
->dst_reg
, si
->src_reg
,
8366 offsetof(struct bpf_sock_ops_kern
,
8368 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, si
->dst_reg
, 0, 1);
8369 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8370 struct bpf_sock_ops_kern
, sk
),
8371 si
->dst_reg
, si
->src_reg
,
8372 offsetof(struct bpf_sock_ops_kern
, sk
));
8375 return insn
- insn_buf
;
8378 static u32
sk_skb_convert_ctx_access(enum bpf_access_type type
,
8379 const struct bpf_insn
*si
,
8380 struct bpf_insn
*insn_buf
,
8381 struct bpf_prog
*prog
, u32
*target_size
)
8383 struct bpf_insn
*insn
= insn_buf
;
8387 case offsetof(struct __sk_buff
, data_end
):
8389 off
-= offsetof(struct __sk_buff
, data_end
);
8390 off
+= offsetof(struct sk_buff
, cb
);
8391 off
+= offsetof(struct tcp_skb_cb
, bpf
.data_end
);
8392 *insn
++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si
->dst_reg
,
8396 return bpf_convert_ctx_access(type
, si
, insn_buf
, prog
,
8400 return insn
- insn_buf
;
8403 static u32
sk_msg_convert_ctx_access(enum bpf_access_type type
,
8404 const struct bpf_insn
*si
,
8405 struct bpf_insn
*insn_buf
,
8406 struct bpf_prog
*prog
, u32
*target_size
)
8408 struct bpf_insn
*insn
= insn_buf
;
8409 #if IS_ENABLED(CONFIG_IPV6)
8413 /* convert ctx uses the fact sg element is first in struct */
8414 BUILD_BUG_ON(offsetof(struct sk_msg
, sg
) != 0);
8417 case offsetof(struct sk_msg_md
, data
):
8418 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg
, data
),
8419 si
->dst_reg
, si
->src_reg
,
8420 offsetof(struct sk_msg
, data
));
8422 case offsetof(struct sk_msg_md
, data_end
):
8423 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg
, data_end
),
8424 si
->dst_reg
, si
->src_reg
,
8425 offsetof(struct sk_msg
, data_end
));
8427 case offsetof(struct sk_msg_md
, family
):
8428 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_family
) != 2);
8430 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8432 si
->dst_reg
, si
->src_reg
,
8433 offsetof(struct sk_msg
, sk
));
8434 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
8435 offsetof(struct sock_common
, skc_family
));
8438 case offsetof(struct sk_msg_md
, remote_ip4
):
8439 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_daddr
) != 4);
8441 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8443 si
->dst_reg
, si
->src_reg
,
8444 offsetof(struct sk_msg
, sk
));
8445 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
8446 offsetof(struct sock_common
, skc_daddr
));
8449 case offsetof(struct sk_msg_md
, local_ip4
):
8450 BUILD_BUG_ON(sizeof_field(struct sock_common
,
8451 skc_rcv_saddr
) != 4);
8453 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8455 si
->dst_reg
, si
->src_reg
,
8456 offsetof(struct sk_msg
, sk
));
8457 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
8458 offsetof(struct sock_common
,
8462 case offsetof(struct sk_msg_md
, remote_ip6
[0]) ...
8463 offsetof(struct sk_msg_md
, remote_ip6
[3]):
8464 #if IS_ENABLED(CONFIG_IPV6)
8465 BUILD_BUG_ON(sizeof_field(struct sock_common
,
8466 skc_v6_daddr
.s6_addr32
[0]) != 4);
8469 off
-= offsetof(struct sk_msg_md
, remote_ip6
[0]);
8470 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8472 si
->dst_reg
, si
->src_reg
,
8473 offsetof(struct sk_msg
, sk
));
8474 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
8475 offsetof(struct sock_common
,
8476 skc_v6_daddr
.s6_addr32
[0]) +
8479 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
8483 case offsetof(struct sk_msg_md
, local_ip6
[0]) ...
8484 offsetof(struct sk_msg_md
, local_ip6
[3]):
8485 #if IS_ENABLED(CONFIG_IPV6)
8486 BUILD_BUG_ON(sizeof_field(struct sock_common
,
8487 skc_v6_rcv_saddr
.s6_addr32
[0]) != 4);
8490 off
-= offsetof(struct sk_msg_md
, local_ip6
[0]);
8491 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8493 si
->dst_reg
, si
->src_reg
,
8494 offsetof(struct sk_msg
, sk
));
8495 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
8496 offsetof(struct sock_common
,
8497 skc_v6_rcv_saddr
.s6_addr32
[0]) +
8500 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
8504 case offsetof(struct sk_msg_md
, remote_port
):
8505 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_dport
) != 2);
8507 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8509 si
->dst_reg
, si
->src_reg
,
8510 offsetof(struct sk_msg
, sk
));
8511 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
8512 offsetof(struct sock_common
, skc_dport
));
8513 #ifndef __BIG_ENDIAN_BITFIELD
8514 *insn
++ = BPF_ALU32_IMM(BPF_LSH
, si
->dst_reg
, 16);
8518 case offsetof(struct sk_msg_md
, local_port
):
8519 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_num
) != 2);
8521 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8523 si
->dst_reg
, si
->src_reg
,
8524 offsetof(struct sk_msg
, sk
));
8525 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
8526 offsetof(struct sock_common
, skc_num
));
8529 case offsetof(struct sk_msg_md
, size
):
8530 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg
, size
),
8531 si
->dst_reg
, si
->src_reg
,
8532 offsetof(struct sk_msg_sg
, size
));
8536 return insn
- insn_buf
;
8539 const struct bpf_verifier_ops sk_filter_verifier_ops
= {
8540 .get_func_proto
= sk_filter_func_proto
,
8541 .is_valid_access
= sk_filter_is_valid_access
,
8542 .convert_ctx_access
= bpf_convert_ctx_access
,
8543 .gen_ld_abs
= bpf_gen_ld_abs
,
8546 const struct bpf_prog_ops sk_filter_prog_ops
= {
8547 .test_run
= bpf_prog_test_run_skb
,
8550 const struct bpf_verifier_ops tc_cls_act_verifier_ops
= {
8551 .get_func_proto
= tc_cls_act_func_proto
,
8552 .is_valid_access
= tc_cls_act_is_valid_access
,
8553 .convert_ctx_access
= tc_cls_act_convert_ctx_access
,
8554 .gen_prologue
= tc_cls_act_prologue
,
8555 .gen_ld_abs
= bpf_gen_ld_abs
,
8558 const struct bpf_prog_ops tc_cls_act_prog_ops
= {
8559 .test_run
= bpf_prog_test_run_skb
,
8562 const struct bpf_verifier_ops xdp_verifier_ops
= {
8563 .get_func_proto
= xdp_func_proto
,
8564 .is_valid_access
= xdp_is_valid_access
,
8565 .convert_ctx_access
= xdp_convert_ctx_access
,
8566 .gen_prologue
= bpf_noop_prologue
,
8569 const struct bpf_prog_ops xdp_prog_ops
= {
8570 .test_run
= bpf_prog_test_run_xdp
,
8573 const struct bpf_verifier_ops cg_skb_verifier_ops
= {
8574 .get_func_proto
= cg_skb_func_proto
,
8575 .is_valid_access
= cg_skb_is_valid_access
,
8576 .convert_ctx_access
= bpf_convert_ctx_access
,
8579 const struct bpf_prog_ops cg_skb_prog_ops
= {
8580 .test_run
= bpf_prog_test_run_skb
,
8583 const struct bpf_verifier_ops lwt_in_verifier_ops
= {
8584 .get_func_proto
= lwt_in_func_proto
,
8585 .is_valid_access
= lwt_is_valid_access
,
8586 .convert_ctx_access
= bpf_convert_ctx_access
,
8589 const struct bpf_prog_ops lwt_in_prog_ops
= {
8590 .test_run
= bpf_prog_test_run_skb
,
8593 const struct bpf_verifier_ops lwt_out_verifier_ops
= {
8594 .get_func_proto
= lwt_out_func_proto
,
8595 .is_valid_access
= lwt_is_valid_access
,
8596 .convert_ctx_access
= bpf_convert_ctx_access
,
8599 const struct bpf_prog_ops lwt_out_prog_ops
= {
8600 .test_run
= bpf_prog_test_run_skb
,
8603 const struct bpf_verifier_ops lwt_xmit_verifier_ops
= {
8604 .get_func_proto
= lwt_xmit_func_proto
,
8605 .is_valid_access
= lwt_is_valid_access
,
8606 .convert_ctx_access
= bpf_convert_ctx_access
,
8607 .gen_prologue
= tc_cls_act_prologue
,
8610 const struct bpf_prog_ops lwt_xmit_prog_ops
= {
8611 .test_run
= bpf_prog_test_run_skb
,
8614 const struct bpf_verifier_ops lwt_seg6local_verifier_ops
= {
8615 .get_func_proto
= lwt_seg6local_func_proto
,
8616 .is_valid_access
= lwt_is_valid_access
,
8617 .convert_ctx_access
= bpf_convert_ctx_access
,
8620 const struct bpf_prog_ops lwt_seg6local_prog_ops
= {
8621 .test_run
= bpf_prog_test_run_skb
,
8624 const struct bpf_verifier_ops cg_sock_verifier_ops
= {
8625 .get_func_proto
= sock_filter_func_proto
,
8626 .is_valid_access
= sock_filter_is_valid_access
,
8627 .convert_ctx_access
= bpf_sock_convert_ctx_access
,
8630 const struct bpf_prog_ops cg_sock_prog_ops
= {
8633 const struct bpf_verifier_ops cg_sock_addr_verifier_ops
= {
8634 .get_func_proto
= sock_addr_func_proto
,
8635 .is_valid_access
= sock_addr_is_valid_access
,
8636 .convert_ctx_access
= sock_addr_convert_ctx_access
,
8639 const struct bpf_prog_ops cg_sock_addr_prog_ops
= {
8642 const struct bpf_verifier_ops sock_ops_verifier_ops
= {
8643 .get_func_proto
= sock_ops_func_proto
,
8644 .is_valid_access
= sock_ops_is_valid_access
,
8645 .convert_ctx_access
= sock_ops_convert_ctx_access
,
8648 const struct bpf_prog_ops sock_ops_prog_ops
= {
8651 const struct bpf_verifier_ops sk_skb_verifier_ops
= {
8652 .get_func_proto
= sk_skb_func_proto
,
8653 .is_valid_access
= sk_skb_is_valid_access
,
8654 .convert_ctx_access
= sk_skb_convert_ctx_access
,
8655 .gen_prologue
= sk_skb_prologue
,
8658 const struct bpf_prog_ops sk_skb_prog_ops
= {
8661 const struct bpf_verifier_ops sk_msg_verifier_ops
= {
8662 .get_func_proto
= sk_msg_func_proto
,
8663 .is_valid_access
= sk_msg_is_valid_access
,
8664 .convert_ctx_access
= sk_msg_convert_ctx_access
,
8665 .gen_prologue
= bpf_noop_prologue
,
8668 const struct bpf_prog_ops sk_msg_prog_ops
= {
8671 const struct bpf_verifier_ops flow_dissector_verifier_ops
= {
8672 .get_func_proto
= flow_dissector_func_proto
,
8673 .is_valid_access
= flow_dissector_is_valid_access
,
8674 .convert_ctx_access
= flow_dissector_convert_ctx_access
,
8677 const struct bpf_prog_ops flow_dissector_prog_ops
= {
8678 .test_run
= bpf_prog_test_run_flow_dissector
,
8681 int sk_detach_filter(struct sock
*sk
)
8684 struct sk_filter
*filter
;
8686 if (sock_flag(sk
, SOCK_FILTER_LOCKED
))
8689 filter
= rcu_dereference_protected(sk
->sk_filter
,
8690 lockdep_sock_is_held(sk
));
8692 RCU_INIT_POINTER(sk
->sk_filter
, NULL
);
8693 sk_filter_uncharge(sk
, filter
);
8699 EXPORT_SYMBOL_GPL(sk_detach_filter
);
8701 int sk_get_filter(struct sock
*sk
, struct sock_filter __user
*ubuf
,
8704 struct sock_fprog_kern
*fprog
;
8705 struct sk_filter
*filter
;
8709 filter
= rcu_dereference_protected(sk
->sk_filter
,
8710 lockdep_sock_is_held(sk
));
8714 /* We're copying the filter that has been originally attached,
8715 * so no conversion/decode needed anymore. eBPF programs that
8716 * have no original program cannot be dumped through this.
8719 fprog
= filter
->prog
->orig_prog
;
8725 /* User space only enquires number of filter blocks. */
8729 if (len
< fprog
->len
)
8733 if (copy_to_user(ubuf
, fprog
->filter
, bpf_classic_proglen(fprog
)))
8736 /* Instead of bytes, the API requests to return the number
8746 static void bpf_init_reuseport_kern(struct sk_reuseport_kern
*reuse_kern
,
8747 struct sock_reuseport
*reuse
,
8748 struct sock
*sk
, struct sk_buff
*skb
,
8751 reuse_kern
->skb
= skb
;
8752 reuse_kern
->sk
= sk
;
8753 reuse_kern
->selected_sk
= NULL
;
8754 reuse_kern
->data_end
= skb
->data
+ skb_headlen(skb
);
8755 reuse_kern
->hash
= hash
;
8756 reuse_kern
->reuseport_id
= reuse
->reuseport_id
;
8757 reuse_kern
->bind_inany
= reuse
->bind_inany
;
8760 struct sock
*bpf_run_sk_reuseport(struct sock_reuseport
*reuse
, struct sock
*sk
,
8761 struct bpf_prog
*prog
, struct sk_buff
*skb
,
8764 struct sk_reuseport_kern reuse_kern
;
8765 enum sk_action action
;
8767 bpf_init_reuseport_kern(&reuse_kern
, reuse
, sk
, skb
, hash
);
8768 action
= BPF_PROG_RUN(prog
, &reuse_kern
);
8770 if (action
== SK_PASS
)
8771 return reuse_kern
.selected_sk
;
8773 return ERR_PTR(-ECONNREFUSED
);
8776 BPF_CALL_4(sk_select_reuseport
, struct sk_reuseport_kern
*, reuse_kern
,
8777 struct bpf_map
*, map
, void *, key
, u32
, flags
)
8779 bool is_sockarray
= map
->map_type
== BPF_MAP_TYPE_REUSEPORT_SOCKARRAY
;
8780 struct sock_reuseport
*reuse
;
8781 struct sock
*selected_sk
;
8783 selected_sk
= map
->ops
->map_lookup_elem(map
, key
);
8787 reuse
= rcu_dereference(selected_sk
->sk_reuseport_cb
);
8789 /* reuseport_array has only sk with non NULL sk_reuseport_cb.
8790 * The only (!reuse) case here is - the sk has already been
8791 * unhashed (e.g. by close()), so treat it as -ENOENT.
8793 * Other maps (e.g. sock_map) do not provide this guarantee and
8794 * the sk may never be in the reuseport group to begin with.
8796 return is_sockarray
? -ENOENT
: -EINVAL
;
8799 if (unlikely(reuse
->reuseport_id
!= reuse_kern
->reuseport_id
)) {
8800 struct sock
*sk
= reuse_kern
->sk
;
8802 if (sk
->sk_protocol
!= selected_sk
->sk_protocol
)
8804 else if (sk
->sk_family
!= selected_sk
->sk_family
)
8805 return -EAFNOSUPPORT
;
8807 /* Catch all. Likely bound to a different sockaddr. */
8811 reuse_kern
->selected_sk
= selected_sk
;
8816 static const struct bpf_func_proto sk_select_reuseport_proto
= {
8817 .func
= sk_select_reuseport
,
8819 .ret_type
= RET_INTEGER
,
8820 .arg1_type
= ARG_PTR_TO_CTX
,
8821 .arg2_type
= ARG_CONST_MAP_PTR
,
8822 .arg3_type
= ARG_PTR_TO_MAP_KEY
,
8823 .arg4_type
= ARG_ANYTHING
,
8826 BPF_CALL_4(sk_reuseport_load_bytes
,
8827 const struct sk_reuseport_kern
*, reuse_kern
, u32
, offset
,
8828 void *, to
, u32
, len
)
8830 return ____bpf_skb_load_bytes(reuse_kern
->skb
, offset
, to
, len
);
8833 static const struct bpf_func_proto sk_reuseport_load_bytes_proto
= {
8834 .func
= sk_reuseport_load_bytes
,
8836 .ret_type
= RET_INTEGER
,
8837 .arg1_type
= ARG_PTR_TO_CTX
,
8838 .arg2_type
= ARG_ANYTHING
,
8839 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
8840 .arg4_type
= ARG_CONST_SIZE
,
8843 BPF_CALL_5(sk_reuseport_load_bytes_relative
,
8844 const struct sk_reuseport_kern
*, reuse_kern
, u32
, offset
,
8845 void *, to
, u32
, len
, u32
, start_header
)
8847 return ____bpf_skb_load_bytes_relative(reuse_kern
->skb
, offset
, to
,
8851 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto
= {
8852 .func
= sk_reuseport_load_bytes_relative
,
8854 .ret_type
= RET_INTEGER
,
8855 .arg1_type
= ARG_PTR_TO_CTX
,
8856 .arg2_type
= ARG_ANYTHING
,
8857 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
8858 .arg4_type
= ARG_CONST_SIZE
,
8859 .arg5_type
= ARG_ANYTHING
,
8862 static const struct bpf_func_proto
*
8863 sk_reuseport_func_proto(enum bpf_func_id func_id
,
8864 const struct bpf_prog
*prog
)
8867 case BPF_FUNC_sk_select_reuseport
:
8868 return &sk_select_reuseport_proto
;
8869 case BPF_FUNC_skb_load_bytes
:
8870 return &sk_reuseport_load_bytes_proto
;
8871 case BPF_FUNC_skb_load_bytes_relative
:
8872 return &sk_reuseport_load_bytes_relative_proto
;
8874 return bpf_base_func_proto(func_id
);
8879 sk_reuseport_is_valid_access(int off
, int size
,
8880 enum bpf_access_type type
,
8881 const struct bpf_prog
*prog
,
8882 struct bpf_insn_access_aux
*info
)
8884 const u32 size_default
= sizeof(__u32
);
8886 if (off
< 0 || off
>= sizeof(struct sk_reuseport_md
) ||
8887 off
% size
|| type
!= BPF_READ
)
8891 case offsetof(struct sk_reuseport_md
, data
):
8892 info
->reg_type
= PTR_TO_PACKET
;
8893 return size
== sizeof(__u64
);
8895 case offsetof(struct sk_reuseport_md
, data_end
):
8896 info
->reg_type
= PTR_TO_PACKET_END
;
8897 return size
== sizeof(__u64
);
8899 case offsetof(struct sk_reuseport_md
, hash
):
8900 return size
== size_default
;
8902 /* Fields that allow narrowing */
8903 case bpf_ctx_range(struct sk_reuseport_md
, eth_protocol
):
8904 if (size
< sizeof_field(struct sk_buff
, protocol
))
8907 case bpf_ctx_range(struct sk_reuseport_md
, ip_protocol
):
8908 case bpf_ctx_range(struct sk_reuseport_md
, bind_inany
):
8909 case bpf_ctx_range(struct sk_reuseport_md
, len
):
8910 bpf_ctx_record_field_size(info
, size_default
);
8911 return bpf_ctx_narrow_access_ok(off
, size
, size_default
);
8918 #define SK_REUSEPORT_LOAD_FIELD(F) ({ \
8919 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \
8920 si->dst_reg, si->src_reg, \
8921 bpf_target_off(struct sk_reuseport_kern, F, \
8922 sizeof_field(struct sk_reuseport_kern, F), \
8926 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \
8927 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \
8932 #define SK_REUSEPORT_LOAD_SK_FIELD(SK_FIELD) \
8933 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \
8938 static u32
sk_reuseport_convert_ctx_access(enum bpf_access_type type
,
8939 const struct bpf_insn
*si
,
8940 struct bpf_insn
*insn_buf
,
8941 struct bpf_prog
*prog
,
8944 struct bpf_insn
*insn
= insn_buf
;
8947 case offsetof(struct sk_reuseport_md
, data
):
8948 SK_REUSEPORT_LOAD_SKB_FIELD(data
);
8951 case offsetof(struct sk_reuseport_md
, len
):
8952 SK_REUSEPORT_LOAD_SKB_FIELD(len
);
8955 case offsetof(struct sk_reuseport_md
, eth_protocol
):
8956 SK_REUSEPORT_LOAD_SKB_FIELD(protocol
);
8959 case offsetof(struct sk_reuseport_md
, ip_protocol
):
8960 SK_REUSEPORT_LOAD_SK_FIELD(sk_protocol
);
8963 case offsetof(struct sk_reuseport_md
, data_end
):
8964 SK_REUSEPORT_LOAD_FIELD(data_end
);
8967 case offsetof(struct sk_reuseport_md
, hash
):
8968 SK_REUSEPORT_LOAD_FIELD(hash
);
8971 case offsetof(struct sk_reuseport_md
, bind_inany
):
8972 SK_REUSEPORT_LOAD_FIELD(bind_inany
);
8976 return insn
- insn_buf
;
8979 const struct bpf_verifier_ops sk_reuseport_verifier_ops
= {
8980 .get_func_proto
= sk_reuseport_func_proto
,
8981 .is_valid_access
= sk_reuseport_is_valid_access
,
8982 .convert_ctx_access
= sk_reuseport_convert_ctx_access
,
8985 const struct bpf_prog_ops sk_reuseport_prog_ops
= {
8987 #endif /* CONFIG_INET */
8989 DEFINE_BPF_DISPATCHER(xdp
)
8991 void bpf_prog_change_xdp(struct bpf_prog
*prev_prog
, struct bpf_prog
*prog
)
8993 bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(xdp
), prev_prog
, prog
);