2 * Linux Socket Filter - Kernel level socket filtering
4 * Based on the design of the Berkeley Packet Filter. The new
5 * internal format has been designed by PLUMgrid:
7 * Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com
11 * Jay Schulist <jschlst@samba.org>
12 * Alexei Starovoitov <ast@plumgrid.com>
13 * Daniel Borkmann <dborkman@redhat.com>
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
20 * Andi Kleen - Fix a few bad bugs and races.
21 * Kris Katterjohn - Added many additional checks in bpf_check_classic()
24 #include <linux/module.h>
25 #include <linux/types.h>
27 #include <linux/fcntl.h>
28 #include <linux/socket.h>
29 #include <linux/sock_diag.h>
31 #include <linux/inet.h>
32 #include <linux/netdevice.h>
33 #include <linux/if_packet.h>
34 #include <linux/if_arp.h>
35 #include <linux/gfp.h>
36 #include <net/inet_common.h>
38 #include <net/protocol.h>
39 #include <net/netlink.h>
40 #include <linux/skbuff.h>
41 #include <linux/skmsg.h>
43 #include <net/flow_dissector.h>
44 #include <linux/errno.h>
45 #include <linux/timer.h>
46 #include <linux/uaccess.h>
47 #include <asm/unaligned.h>
48 #include <asm/cmpxchg.h>
49 #include <linux/filter.h>
50 #include <linux/ratelimit.h>
51 #include <linux/seccomp.h>
52 #include <linux/if_vlan.h>
53 #include <linux/bpf.h>
54 #include <net/sch_generic.h>
55 #include <net/cls_cgroup.h>
56 #include <net/dst_metadata.h>
58 #include <net/sock_reuseport.h>
59 #include <net/busy_poll.h>
63 #include <linux/bpf_trace.h>
64 #include <net/xdp_sock.h>
65 #include <linux/inetdevice.h>
66 #include <net/inet_hashtables.h>
67 #include <net/inet6_hashtables.h>
68 #include <net/ip_fib.h>
72 #include <net/net_namespace.h>
73 #include <linux/seg6_local.h>
75 #include <net/seg6_local.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(FIELD_SIZEOF(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(FIELD_SIZEOF(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(FIELD_SIZEOF(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(FIELD_SIZEOF(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(FIELD_SIZEOF(struct net_device
, ifindex
) != 4);
342 BUILD_BUG_ON(FIELD_SIZEOF(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(FIELD_SIZEOF(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(FIELD_SIZEOF(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 (IS_ERR(prog
) && 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_5(bpf_skb_load_bytes_relative
, const struct sk_buff
*, skb
,
1732 u32
, offset
, void *, to
, u32
, len
, u32
, start_header
)
1734 u8
*end
= skb_tail_pointer(skb
);
1735 u8
*net
= skb_network_header(skb
);
1736 u8
*mac
= skb_mac_header(skb
);
1739 if (unlikely(offset
> 0xffff || len
> (end
- mac
)))
1742 switch (start_header
) {
1743 case BPF_HDR_START_MAC
:
1746 case BPF_HDR_START_NET
:
1753 if (likely(ptr
>= mac
&& ptr
+ len
<= end
)) {
1754 memcpy(to
, ptr
, len
);
1763 static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto
= {
1764 .func
= bpf_skb_load_bytes_relative
,
1766 .ret_type
= RET_INTEGER
,
1767 .arg1_type
= ARG_PTR_TO_CTX
,
1768 .arg2_type
= ARG_ANYTHING
,
1769 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
1770 .arg4_type
= ARG_CONST_SIZE
,
1771 .arg5_type
= ARG_ANYTHING
,
1774 BPF_CALL_2(bpf_skb_pull_data
, struct sk_buff
*, skb
, u32
, len
)
1776 /* Idea is the following: should the needed direct read/write
1777 * test fail during runtime, we can pull in more data and redo
1778 * again, since implicitly, we invalidate previous checks here.
1780 * Or, since we know how much we need to make read/writeable,
1781 * this can be done once at the program beginning for direct
1782 * access case. By this we overcome limitations of only current
1783 * headroom being accessible.
1785 return bpf_try_make_writable(skb
, len
? : skb_headlen(skb
));
1788 static const struct bpf_func_proto bpf_skb_pull_data_proto
= {
1789 .func
= bpf_skb_pull_data
,
1791 .ret_type
= RET_INTEGER
,
1792 .arg1_type
= ARG_PTR_TO_CTX
,
1793 .arg2_type
= ARG_ANYTHING
,
1796 static inline int sk_skb_try_make_writable(struct sk_buff
*skb
,
1797 unsigned int write_len
)
1799 int err
= __bpf_try_make_writable(skb
, write_len
);
1801 bpf_compute_data_end_sk_skb(skb
);
1805 BPF_CALL_2(sk_skb_pull_data
, struct sk_buff
*, skb
, u32
, len
)
1807 /* Idea is the following: should the needed direct read/write
1808 * test fail during runtime, we can pull in more data and redo
1809 * again, since implicitly, we invalidate previous checks here.
1811 * Or, since we know how much we need to make read/writeable,
1812 * this can be done once at the program beginning for direct
1813 * access case. By this we overcome limitations of only current
1814 * headroom being accessible.
1816 return sk_skb_try_make_writable(skb
, len
? : skb_headlen(skb
));
1819 static const struct bpf_func_proto sk_skb_pull_data_proto
= {
1820 .func
= sk_skb_pull_data
,
1822 .ret_type
= RET_INTEGER
,
1823 .arg1_type
= ARG_PTR_TO_CTX
,
1824 .arg2_type
= ARG_ANYTHING
,
1827 BPF_CALL_5(bpf_l3_csum_replace
, struct sk_buff
*, skb
, u32
, offset
,
1828 u64
, from
, u64
, to
, u64
, flags
)
1832 if (unlikely(flags
& ~(BPF_F_HDR_FIELD_MASK
)))
1834 if (unlikely(offset
> 0xffff || offset
& 1))
1836 if (unlikely(bpf_try_make_writable(skb
, offset
+ sizeof(*ptr
))))
1839 ptr
= (__sum16
*)(skb
->data
+ offset
);
1840 switch (flags
& BPF_F_HDR_FIELD_MASK
) {
1842 if (unlikely(from
!= 0))
1845 csum_replace_by_diff(ptr
, to
);
1848 csum_replace2(ptr
, from
, to
);
1851 csum_replace4(ptr
, from
, to
);
1860 static const struct bpf_func_proto bpf_l3_csum_replace_proto
= {
1861 .func
= bpf_l3_csum_replace
,
1863 .ret_type
= RET_INTEGER
,
1864 .arg1_type
= ARG_PTR_TO_CTX
,
1865 .arg2_type
= ARG_ANYTHING
,
1866 .arg3_type
= ARG_ANYTHING
,
1867 .arg4_type
= ARG_ANYTHING
,
1868 .arg5_type
= ARG_ANYTHING
,
1871 BPF_CALL_5(bpf_l4_csum_replace
, struct sk_buff
*, skb
, u32
, offset
,
1872 u64
, from
, u64
, to
, u64
, flags
)
1874 bool is_pseudo
= flags
& BPF_F_PSEUDO_HDR
;
1875 bool is_mmzero
= flags
& BPF_F_MARK_MANGLED_0
;
1876 bool do_mforce
= flags
& BPF_F_MARK_ENFORCE
;
1879 if (unlikely(flags
& ~(BPF_F_MARK_MANGLED_0
| BPF_F_MARK_ENFORCE
|
1880 BPF_F_PSEUDO_HDR
| BPF_F_HDR_FIELD_MASK
)))
1882 if (unlikely(offset
> 0xffff || offset
& 1))
1884 if (unlikely(bpf_try_make_writable(skb
, offset
+ sizeof(*ptr
))))
1887 ptr
= (__sum16
*)(skb
->data
+ offset
);
1888 if (is_mmzero
&& !do_mforce
&& !*ptr
)
1891 switch (flags
& BPF_F_HDR_FIELD_MASK
) {
1893 if (unlikely(from
!= 0))
1896 inet_proto_csum_replace_by_diff(ptr
, skb
, to
, is_pseudo
);
1899 inet_proto_csum_replace2(ptr
, skb
, from
, to
, is_pseudo
);
1902 inet_proto_csum_replace4(ptr
, skb
, from
, to
, is_pseudo
);
1908 if (is_mmzero
&& !*ptr
)
1909 *ptr
= CSUM_MANGLED_0
;
1913 static const struct bpf_func_proto bpf_l4_csum_replace_proto
= {
1914 .func
= bpf_l4_csum_replace
,
1916 .ret_type
= RET_INTEGER
,
1917 .arg1_type
= ARG_PTR_TO_CTX
,
1918 .arg2_type
= ARG_ANYTHING
,
1919 .arg3_type
= ARG_ANYTHING
,
1920 .arg4_type
= ARG_ANYTHING
,
1921 .arg5_type
= ARG_ANYTHING
,
1924 BPF_CALL_5(bpf_csum_diff
, __be32
*, from
, u32
, from_size
,
1925 __be32
*, to
, u32
, to_size
, __wsum
, seed
)
1927 struct bpf_scratchpad
*sp
= this_cpu_ptr(&bpf_sp
);
1928 u32 diff_size
= from_size
+ to_size
;
1931 /* This is quite flexible, some examples:
1933 * from_size == 0, to_size > 0, seed := csum --> pushing data
1934 * from_size > 0, to_size == 0, seed := csum --> pulling data
1935 * from_size > 0, to_size > 0, seed := 0 --> diffing data
1937 * Even for diffing, from_size and to_size don't need to be equal.
1939 if (unlikely(((from_size
| to_size
) & (sizeof(__be32
) - 1)) ||
1940 diff_size
> sizeof(sp
->diff
)))
1943 for (i
= 0; i
< from_size
/ sizeof(__be32
); i
++, j
++)
1944 sp
->diff
[j
] = ~from
[i
];
1945 for (i
= 0; i
< to_size
/ sizeof(__be32
); i
++, j
++)
1946 sp
->diff
[j
] = to
[i
];
1948 return csum_partial(sp
->diff
, diff_size
, seed
);
1951 static const struct bpf_func_proto bpf_csum_diff_proto
= {
1952 .func
= bpf_csum_diff
,
1955 .ret_type
= RET_INTEGER
,
1956 .arg1_type
= ARG_PTR_TO_MEM_OR_NULL
,
1957 .arg2_type
= ARG_CONST_SIZE_OR_ZERO
,
1958 .arg3_type
= ARG_PTR_TO_MEM_OR_NULL
,
1959 .arg4_type
= ARG_CONST_SIZE_OR_ZERO
,
1960 .arg5_type
= ARG_ANYTHING
,
1963 BPF_CALL_2(bpf_csum_update
, struct sk_buff
*, skb
, __wsum
, csum
)
1965 /* The interface is to be used in combination with bpf_csum_diff()
1966 * for direct packet writes. csum rotation for alignment as well
1967 * as emulating csum_sub() can be done from the eBPF program.
1969 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
1970 return (skb
->csum
= csum_add(skb
->csum
, csum
));
1975 static const struct bpf_func_proto bpf_csum_update_proto
= {
1976 .func
= bpf_csum_update
,
1978 .ret_type
= RET_INTEGER
,
1979 .arg1_type
= ARG_PTR_TO_CTX
,
1980 .arg2_type
= ARG_ANYTHING
,
1983 static inline int __bpf_rx_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1985 return dev_forward_skb(dev
, skb
);
1988 static inline int __bpf_rx_skb_no_mac(struct net_device
*dev
,
1989 struct sk_buff
*skb
)
1991 int ret
= ____dev_forward_skb(dev
, skb
);
1995 ret
= netif_rx(skb
);
2001 static inline int __bpf_tx_skb(struct net_device
*dev
, struct sk_buff
*skb
)
2005 if (unlikely(__this_cpu_read(xmit_recursion
) > XMIT_RECURSION_LIMIT
)) {
2006 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2013 __this_cpu_inc(xmit_recursion
);
2014 ret
= dev_queue_xmit(skb
);
2015 __this_cpu_dec(xmit_recursion
);
2020 static int __bpf_redirect_no_mac(struct sk_buff
*skb
, struct net_device
*dev
,
2023 /* skb->mac_len is not set on normal egress */
2024 unsigned int mlen
= skb
->network_header
- skb
->mac_header
;
2026 __skb_pull(skb
, mlen
);
2028 /* At ingress, the mac header has already been pulled once.
2029 * At egress, skb_pospull_rcsum has to be done in case that
2030 * the skb is originated from ingress (i.e. a forwarded skb)
2031 * to ensure that rcsum starts at net header.
2033 if (!skb_at_tc_ingress(skb
))
2034 skb_postpull_rcsum(skb
, skb_mac_header(skb
), mlen
);
2035 skb_pop_mac_header(skb
);
2036 skb_reset_mac_len(skb
);
2037 return flags
& BPF_F_INGRESS
?
2038 __bpf_rx_skb_no_mac(dev
, skb
) : __bpf_tx_skb(dev
, skb
);
2041 static int __bpf_redirect_common(struct sk_buff
*skb
, struct net_device
*dev
,
2044 /* Verify that a link layer header is carried */
2045 if (unlikely(skb
->mac_header
>= skb
->network_header
)) {
2050 bpf_push_mac_rcsum(skb
);
2051 return flags
& BPF_F_INGRESS
?
2052 __bpf_rx_skb(dev
, skb
) : __bpf_tx_skb(dev
, skb
);
2055 static int __bpf_redirect(struct sk_buff
*skb
, struct net_device
*dev
,
2058 if (dev_is_mac_header_xmit(dev
))
2059 return __bpf_redirect_common(skb
, dev
, flags
);
2061 return __bpf_redirect_no_mac(skb
, dev
, flags
);
2064 BPF_CALL_3(bpf_clone_redirect
, struct sk_buff
*, skb
, u32
, ifindex
, u64
, flags
)
2066 struct net_device
*dev
;
2067 struct sk_buff
*clone
;
2070 if (unlikely(flags
& ~(BPF_F_INGRESS
)))
2073 dev
= dev_get_by_index_rcu(dev_net(skb
->dev
), ifindex
);
2077 clone
= skb_clone(skb
, GFP_ATOMIC
);
2078 if (unlikely(!clone
))
2081 /* For direct write, we need to keep the invariant that the skbs
2082 * we're dealing with need to be uncloned. Should uncloning fail
2083 * here, we need to free the just generated clone to unclone once
2086 ret
= bpf_try_make_head_writable(skb
);
2087 if (unlikely(ret
)) {
2092 return __bpf_redirect(clone
, dev
, flags
);
2095 static const struct bpf_func_proto bpf_clone_redirect_proto
= {
2096 .func
= bpf_clone_redirect
,
2098 .ret_type
= RET_INTEGER
,
2099 .arg1_type
= ARG_PTR_TO_CTX
,
2100 .arg2_type
= ARG_ANYTHING
,
2101 .arg3_type
= ARG_ANYTHING
,
2104 DEFINE_PER_CPU(struct bpf_redirect_info
, bpf_redirect_info
);
2105 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info
);
2107 BPF_CALL_2(bpf_redirect
, u32
, ifindex
, u64
, flags
)
2109 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
2111 if (unlikely(flags
& ~(BPF_F_INGRESS
)))
2114 ri
->ifindex
= ifindex
;
2117 return TC_ACT_REDIRECT
;
2120 int skb_do_redirect(struct sk_buff
*skb
)
2122 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
2123 struct net_device
*dev
;
2125 dev
= dev_get_by_index_rcu(dev_net(skb
->dev
), ri
->ifindex
);
2127 if (unlikely(!dev
)) {
2132 return __bpf_redirect(skb
, dev
, ri
->flags
);
2135 static const struct bpf_func_proto bpf_redirect_proto
= {
2136 .func
= bpf_redirect
,
2138 .ret_type
= RET_INTEGER
,
2139 .arg1_type
= ARG_ANYTHING
,
2140 .arg2_type
= ARG_ANYTHING
,
2143 BPF_CALL_2(bpf_msg_apply_bytes
, struct sk_msg
*, msg
, u32
, bytes
)
2145 msg
->apply_bytes
= bytes
;
2149 static const struct bpf_func_proto bpf_msg_apply_bytes_proto
= {
2150 .func
= bpf_msg_apply_bytes
,
2152 .ret_type
= RET_INTEGER
,
2153 .arg1_type
= ARG_PTR_TO_CTX
,
2154 .arg2_type
= ARG_ANYTHING
,
2157 BPF_CALL_2(bpf_msg_cork_bytes
, struct sk_msg
*, msg
, u32
, bytes
)
2159 msg
->cork_bytes
= bytes
;
2163 static const struct bpf_func_proto bpf_msg_cork_bytes_proto
= {
2164 .func
= bpf_msg_cork_bytes
,
2166 .ret_type
= RET_INTEGER
,
2167 .arg1_type
= ARG_PTR_TO_CTX
,
2168 .arg2_type
= ARG_ANYTHING
,
2171 BPF_CALL_4(bpf_msg_pull_data
, struct sk_msg
*, msg
, u32
, start
,
2172 u32
, end
, u64
, flags
)
2174 u32 len
= 0, offset
= 0, copy
= 0, poffset
= 0, bytes
= end
- start
;
2175 u32 first_sge
, last_sge
, i
, shift
, bytes_sg_total
;
2176 struct scatterlist
*sge
;
2177 u8
*raw
, *to
, *from
;
2180 if (unlikely(flags
|| end
<= start
))
2183 /* First find the starting scatterlist element */
2186 len
= sk_msg_elem(msg
, i
)->length
;
2187 if (start
< offset
+ len
)
2190 sk_msg_iter_var_next(i
);
2191 } while (i
!= msg
->sg
.end
);
2193 if (unlikely(start
>= offset
+ len
))
2197 /* The start may point into the sg element so we need to also
2198 * account for the headroom.
2200 bytes_sg_total
= start
- offset
+ bytes
;
2201 if (!msg
->sg
.copy
[i
] && bytes_sg_total
<= len
)
2204 /* At this point we need to linearize multiple scatterlist
2205 * elements or a single shared page. Either way we need to
2206 * copy into a linear buffer exclusively owned by BPF. Then
2207 * place the buffer in the scatterlist and fixup the original
2208 * entries by removing the entries now in the linear buffer
2209 * and shifting the remaining entries. For now we do not try
2210 * to copy partial entries to avoid complexity of running out
2211 * of sg_entry slots. The downside is reading a single byte
2212 * will copy the entire sg entry.
2215 copy
+= sk_msg_elem(msg
, i
)->length
;
2216 sk_msg_iter_var_next(i
);
2217 if (bytes_sg_total
<= copy
)
2219 } while (i
!= msg
->sg
.end
);
2222 if (unlikely(bytes_sg_total
> copy
))
2225 page
= alloc_pages(__GFP_NOWARN
| GFP_ATOMIC
| __GFP_COMP
,
2227 if (unlikely(!page
))
2230 raw
= page_address(page
);
2233 sge
= sk_msg_elem(msg
, i
);
2234 from
= sg_virt(sge
);
2238 memcpy(to
, from
, len
);
2241 put_page(sg_page(sge
));
2243 sk_msg_iter_var_next(i
);
2244 } while (i
!= last_sge
);
2246 sg_set_page(&msg
->sg
.data
[first_sge
], page
, copy
, 0);
2248 /* To repair sg ring we need to shift entries. If we only
2249 * had a single entry though we can just replace it and
2250 * be done. Otherwise walk the ring and shift the entries.
2252 WARN_ON_ONCE(last_sge
== first_sge
);
2253 shift
= last_sge
> first_sge
?
2254 last_sge
- first_sge
- 1 :
2255 MAX_SKB_FRAGS
- first_sge
+ last_sge
- 1;
2260 sk_msg_iter_var_next(i
);
2264 if (i
+ shift
>= MAX_MSG_FRAGS
)
2265 move_from
= i
+ shift
- MAX_MSG_FRAGS
;
2267 move_from
= i
+ shift
;
2268 if (move_from
== msg
->sg
.end
)
2271 msg
->sg
.data
[i
] = msg
->sg
.data
[move_from
];
2272 msg
->sg
.data
[move_from
].length
= 0;
2273 msg
->sg
.data
[move_from
].page_link
= 0;
2274 msg
->sg
.data
[move_from
].offset
= 0;
2275 sk_msg_iter_var_next(i
);
2278 msg
->sg
.end
= msg
->sg
.end
- shift
> msg
->sg
.end
?
2279 msg
->sg
.end
- shift
+ MAX_MSG_FRAGS
:
2280 msg
->sg
.end
- shift
;
2282 msg
->data
= sg_virt(&msg
->sg
.data
[first_sge
]) + start
- offset
;
2283 msg
->data_end
= msg
->data
+ bytes
;
2287 static const struct bpf_func_proto bpf_msg_pull_data_proto
= {
2288 .func
= bpf_msg_pull_data
,
2290 .ret_type
= RET_INTEGER
,
2291 .arg1_type
= ARG_PTR_TO_CTX
,
2292 .arg2_type
= ARG_ANYTHING
,
2293 .arg3_type
= ARG_ANYTHING
,
2294 .arg4_type
= ARG_ANYTHING
,
2297 BPF_CALL_4(bpf_msg_push_data
, struct sk_msg
*, msg
, u32
, start
,
2298 u32
, len
, u64
, flags
)
2300 struct scatterlist sge
, nsge
, nnsge
, rsge
= {0}, *psge
;
2301 u32
new, i
= 0, l
, space
, copy
= 0, offset
= 0;
2302 u8
*raw
, *to
, *from
;
2305 if (unlikely(flags
))
2308 /* First find the starting scatterlist element */
2311 l
= sk_msg_elem(msg
, i
)->length
;
2313 if (start
< offset
+ l
)
2316 sk_msg_iter_var_next(i
);
2317 } while (i
!= msg
->sg
.end
);
2319 if (start
>= offset
+ l
)
2322 space
= MAX_MSG_FRAGS
- sk_msg_elem_used(msg
);
2324 /* If no space available will fallback to copy, we need at
2325 * least one scatterlist elem available to push data into
2326 * when start aligns to the beginning of an element or two
2327 * when it falls inside an element. We handle the start equals
2328 * offset case because its the common case for inserting a
2331 if (!space
|| (space
== 1 && start
!= offset
))
2332 copy
= msg
->sg
.data
[i
].length
;
2334 page
= alloc_pages(__GFP_NOWARN
| GFP_ATOMIC
| __GFP_COMP
,
2335 get_order(copy
+ len
));
2336 if (unlikely(!page
))
2342 raw
= page_address(page
);
2344 psge
= sk_msg_elem(msg
, i
);
2345 front
= start
- offset
;
2346 back
= psge
->length
- front
;
2347 from
= sg_virt(psge
);
2350 memcpy(raw
, from
, front
);
2354 to
= raw
+ front
+ len
;
2356 memcpy(to
, from
, back
);
2359 put_page(sg_page(psge
));
2360 } else if (start
- offset
) {
2361 psge
= sk_msg_elem(msg
, i
);
2362 rsge
= sk_msg_elem_cpy(msg
, i
);
2364 psge
->length
= start
- offset
;
2365 rsge
.length
-= psge
->length
;
2366 rsge
.offset
+= start
;
2368 sk_msg_iter_var_next(i
);
2369 sg_unmark_end(psge
);
2370 sk_msg_iter_next(msg
, end
);
2373 /* Slot(s) to place newly allocated data */
2376 /* Shift one or two slots as needed */
2378 sge
= sk_msg_elem_cpy(msg
, i
);
2380 sk_msg_iter_var_next(i
);
2381 sg_unmark_end(&sge
);
2382 sk_msg_iter_next(msg
, end
);
2384 nsge
= sk_msg_elem_cpy(msg
, i
);
2386 sk_msg_iter_var_next(i
);
2387 nnsge
= sk_msg_elem_cpy(msg
, i
);
2390 while (i
!= msg
->sg
.end
) {
2391 msg
->sg
.data
[i
] = sge
;
2393 sk_msg_iter_var_next(i
);
2396 nnsge
= sk_msg_elem_cpy(msg
, i
);
2398 nsge
= sk_msg_elem_cpy(msg
, i
);
2403 /* Place newly allocated data buffer */
2404 sk_mem_charge(msg
->sk
, len
);
2405 msg
->sg
.size
+= len
;
2406 msg
->sg
.copy
[new] = false;
2407 sg_set_page(&msg
->sg
.data
[new], page
, len
+ copy
, 0);
2409 get_page(sg_page(&rsge
));
2410 sk_msg_iter_var_next(new);
2411 msg
->sg
.data
[new] = rsge
;
2414 sk_msg_compute_data_pointers(msg
);
2418 static const struct bpf_func_proto bpf_msg_push_data_proto
= {
2419 .func
= bpf_msg_push_data
,
2421 .ret_type
= RET_INTEGER
,
2422 .arg1_type
= ARG_PTR_TO_CTX
,
2423 .arg2_type
= ARG_ANYTHING
,
2424 .arg3_type
= ARG_ANYTHING
,
2425 .arg4_type
= ARG_ANYTHING
,
2428 static void sk_msg_shift_left(struct sk_msg
*msg
, int i
)
2434 sk_msg_iter_var_next(i
);
2435 msg
->sg
.data
[prev
] = msg
->sg
.data
[i
];
2436 } while (i
!= msg
->sg
.end
);
2438 sk_msg_iter_prev(msg
, end
);
2441 static void sk_msg_shift_right(struct sk_msg
*msg
, int i
)
2443 struct scatterlist tmp
, sge
;
2445 sk_msg_iter_next(msg
, end
);
2446 sge
= sk_msg_elem_cpy(msg
, i
);
2447 sk_msg_iter_var_next(i
);
2448 tmp
= sk_msg_elem_cpy(msg
, i
);
2450 while (i
!= msg
->sg
.end
) {
2451 msg
->sg
.data
[i
] = sge
;
2452 sk_msg_iter_var_next(i
);
2454 tmp
= sk_msg_elem_cpy(msg
, i
);
2458 BPF_CALL_4(bpf_msg_pop_data
, struct sk_msg
*, msg
, u32
, start
,
2459 u32
, len
, u64
, flags
)
2461 u32 i
= 0, l
, space
, offset
= 0;
2462 u64 last
= start
+ len
;
2465 if (unlikely(flags
))
2468 /* First find the starting scatterlist element */
2471 l
= sk_msg_elem(msg
, i
)->length
;
2473 if (start
< offset
+ l
)
2476 sk_msg_iter_var_next(i
);
2477 } while (i
!= msg
->sg
.end
);
2479 /* Bounds checks: start and pop must be inside message */
2480 if (start
>= offset
+ l
|| last
>= msg
->sg
.size
)
2483 space
= MAX_MSG_FRAGS
- sk_msg_elem_used(msg
);
2486 /* --------------| offset
2487 * -| start |-------- len -------|
2489 * |----- a ----|-------- pop -------|----- b ----|
2490 * |______________________________________________| length
2493 * a: region at front of scatter element to save
2494 * b: region at back of scatter element to save when length > A + pop
2495 * pop: region to pop from element, same as input 'pop' here will be
2496 * decremented below per iteration.
2498 * Two top-level cases to handle when start != offset, first B is non
2499 * zero and second B is zero corresponding to when a pop includes more
2502 * Then if B is non-zero AND there is no space allocate space and
2503 * compact A, B regions into page. If there is space shift ring to
2504 * the rigth free'ing the next element in ring to place B, leaving
2505 * A untouched except to reduce length.
2507 if (start
!= offset
) {
2508 struct scatterlist
*nsge
, *sge
= sk_msg_elem(msg
, i
);
2510 int b
= sge
->length
- pop
- a
;
2512 sk_msg_iter_var_next(i
);
2514 if (pop
< sge
->length
- a
) {
2517 sk_msg_shift_right(msg
, i
);
2518 nsge
= sk_msg_elem(msg
, i
);
2519 get_page(sg_page(sge
));
2522 b
, sge
->offset
+ pop
+ a
);
2524 struct page
*page
, *orig
;
2527 page
= alloc_pages(__GFP_NOWARN
|
2528 __GFP_COMP
| GFP_ATOMIC
,
2530 if (unlikely(!page
))
2534 orig
= sg_page(sge
);
2535 from
= sg_virt(sge
);
2536 to
= page_address(page
);
2537 memcpy(to
, from
, a
);
2538 memcpy(to
+ a
, from
+ a
+ pop
, b
);
2539 sg_set_page(sge
, page
, a
+ b
, 0);
2543 } else if (pop
>= sge
->length
- a
) {
2545 pop
-= (sge
->length
- a
);
2549 /* From above the current layout _must_ be as follows,
2554 * |---- pop ---|---------------- b ------------|
2555 * |____________________________________________| length
2557 * Offset and start of the current msg elem are equal because in the
2558 * previous case we handled offset != start and either consumed the
2559 * entire element and advanced to the next element OR pop == 0.
2561 * Two cases to handle here are first pop is less than the length
2562 * leaving some remainder b above. Simply adjust the element's layout
2563 * in this case. Or pop >= length of the element so that b = 0. In this
2564 * case advance to next element decrementing pop.
2567 struct scatterlist
*sge
= sk_msg_elem(msg
, i
);
2569 if (pop
< sge
->length
) {
2575 sk_msg_shift_left(msg
, i
);
2577 sk_msg_iter_var_next(i
);
2580 sk_mem_uncharge(msg
->sk
, len
- pop
);
2581 msg
->sg
.size
-= (len
- pop
);
2582 sk_msg_compute_data_pointers(msg
);
2586 static const struct bpf_func_proto bpf_msg_pop_data_proto
= {
2587 .func
= bpf_msg_pop_data
,
2589 .ret_type
= RET_INTEGER
,
2590 .arg1_type
= ARG_PTR_TO_CTX
,
2591 .arg2_type
= ARG_ANYTHING
,
2592 .arg3_type
= ARG_ANYTHING
,
2593 .arg4_type
= ARG_ANYTHING
,
2596 BPF_CALL_1(bpf_get_cgroup_classid
, const struct sk_buff
*, skb
)
2598 return task_get_classid(skb
);
2601 static const struct bpf_func_proto bpf_get_cgroup_classid_proto
= {
2602 .func
= bpf_get_cgroup_classid
,
2604 .ret_type
= RET_INTEGER
,
2605 .arg1_type
= ARG_PTR_TO_CTX
,
2608 BPF_CALL_1(bpf_get_route_realm
, const struct sk_buff
*, skb
)
2610 return dst_tclassid(skb
);
2613 static const struct bpf_func_proto bpf_get_route_realm_proto
= {
2614 .func
= bpf_get_route_realm
,
2616 .ret_type
= RET_INTEGER
,
2617 .arg1_type
= ARG_PTR_TO_CTX
,
2620 BPF_CALL_1(bpf_get_hash_recalc
, struct sk_buff
*, skb
)
2622 /* If skb_clear_hash() was called due to mangling, we can
2623 * trigger SW recalculation here. Later access to hash
2624 * can then use the inline skb->hash via context directly
2625 * instead of calling this helper again.
2627 return skb_get_hash(skb
);
2630 static const struct bpf_func_proto bpf_get_hash_recalc_proto
= {
2631 .func
= bpf_get_hash_recalc
,
2633 .ret_type
= RET_INTEGER
,
2634 .arg1_type
= ARG_PTR_TO_CTX
,
2637 BPF_CALL_1(bpf_set_hash_invalid
, struct sk_buff
*, skb
)
2639 /* After all direct packet write, this can be used once for
2640 * triggering a lazy recalc on next skb_get_hash() invocation.
2642 skb_clear_hash(skb
);
2646 static const struct bpf_func_proto bpf_set_hash_invalid_proto
= {
2647 .func
= bpf_set_hash_invalid
,
2649 .ret_type
= RET_INTEGER
,
2650 .arg1_type
= ARG_PTR_TO_CTX
,
2653 BPF_CALL_2(bpf_set_hash
, struct sk_buff
*, skb
, u32
, hash
)
2655 /* Set user specified hash as L4(+), so that it gets returned
2656 * on skb_get_hash() call unless BPF prog later on triggers a
2659 __skb_set_sw_hash(skb
, hash
, true);
2663 static const struct bpf_func_proto bpf_set_hash_proto
= {
2664 .func
= bpf_set_hash
,
2666 .ret_type
= RET_INTEGER
,
2667 .arg1_type
= ARG_PTR_TO_CTX
,
2668 .arg2_type
= ARG_ANYTHING
,
2671 BPF_CALL_3(bpf_skb_vlan_push
, struct sk_buff
*, skb
, __be16
, vlan_proto
,
2676 if (unlikely(vlan_proto
!= htons(ETH_P_8021Q
) &&
2677 vlan_proto
!= htons(ETH_P_8021AD
)))
2678 vlan_proto
= htons(ETH_P_8021Q
);
2680 bpf_push_mac_rcsum(skb
);
2681 ret
= skb_vlan_push(skb
, vlan_proto
, vlan_tci
);
2682 bpf_pull_mac_rcsum(skb
);
2684 bpf_compute_data_pointers(skb
);
2688 static const struct bpf_func_proto bpf_skb_vlan_push_proto
= {
2689 .func
= bpf_skb_vlan_push
,
2691 .ret_type
= RET_INTEGER
,
2692 .arg1_type
= ARG_PTR_TO_CTX
,
2693 .arg2_type
= ARG_ANYTHING
,
2694 .arg3_type
= ARG_ANYTHING
,
2697 BPF_CALL_1(bpf_skb_vlan_pop
, struct sk_buff
*, skb
)
2701 bpf_push_mac_rcsum(skb
);
2702 ret
= skb_vlan_pop(skb
);
2703 bpf_pull_mac_rcsum(skb
);
2705 bpf_compute_data_pointers(skb
);
2709 static const struct bpf_func_proto bpf_skb_vlan_pop_proto
= {
2710 .func
= bpf_skb_vlan_pop
,
2712 .ret_type
= RET_INTEGER
,
2713 .arg1_type
= ARG_PTR_TO_CTX
,
2716 static int bpf_skb_generic_push(struct sk_buff
*skb
, u32 off
, u32 len
)
2718 /* Caller already did skb_cow() with len as headroom,
2719 * so no need to do it here.
2722 memmove(skb
->data
, skb
->data
+ len
, off
);
2723 memset(skb
->data
+ off
, 0, len
);
2725 /* No skb_postpush_rcsum(skb, skb->data + off, len)
2726 * needed here as it does not change the skb->csum
2727 * result for checksum complete when summing over
2733 static int bpf_skb_generic_pop(struct sk_buff
*skb
, u32 off
, u32 len
)
2735 /* skb_ensure_writable() is not needed here, as we're
2736 * already working on an uncloned skb.
2738 if (unlikely(!pskb_may_pull(skb
, off
+ len
)))
2741 skb_postpull_rcsum(skb
, skb
->data
+ off
, len
);
2742 memmove(skb
->data
+ len
, skb
->data
, off
);
2743 __skb_pull(skb
, len
);
2748 static int bpf_skb_net_hdr_push(struct sk_buff
*skb
, u32 off
, u32 len
)
2750 bool trans_same
= skb
->transport_header
== skb
->network_header
;
2753 /* There's no need for __skb_push()/__skb_pull() pair to
2754 * get to the start of the mac header as we're guaranteed
2755 * to always start from here under eBPF.
2757 ret
= bpf_skb_generic_push(skb
, off
, len
);
2759 skb
->mac_header
-= len
;
2760 skb
->network_header
-= len
;
2762 skb
->transport_header
= skb
->network_header
;
2768 static int bpf_skb_net_hdr_pop(struct sk_buff
*skb
, u32 off
, u32 len
)
2770 bool trans_same
= skb
->transport_header
== skb
->network_header
;
2773 /* Same here, __skb_push()/__skb_pull() pair not needed. */
2774 ret
= bpf_skb_generic_pop(skb
, off
, len
);
2776 skb
->mac_header
+= len
;
2777 skb
->network_header
+= len
;
2779 skb
->transport_header
= skb
->network_header
;
2785 static int bpf_skb_proto_4_to_6(struct sk_buff
*skb
)
2787 const u32 len_diff
= sizeof(struct ipv6hdr
) - sizeof(struct iphdr
);
2788 u32 off
= skb_mac_header_len(skb
);
2791 /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */
2792 if (skb_is_gso(skb
) && unlikely(skb_is_gso_sctp(skb
)))
2795 ret
= skb_cow(skb
, len_diff
);
2796 if (unlikely(ret
< 0))
2799 ret
= bpf_skb_net_hdr_push(skb
, off
, len_diff
);
2800 if (unlikely(ret
< 0))
2803 if (skb_is_gso(skb
)) {
2804 struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2806 /* SKB_GSO_TCPV4 needs to be changed into
2809 if (shinfo
->gso_type
& SKB_GSO_TCPV4
) {
2810 shinfo
->gso_type
&= ~SKB_GSO_TCPV4
;
2811 shinfo
->gso_type
|= SKB_GSO_TCPV6
;
2814 /* Due to IPv6 header, MSS needs to be downgraded. */
2815 skb_decrease_gso_size(shinfo
, len_diff
);
2816 /* Header must be checked, and gso_segs recomputed. */
2817 shinfo
->gso_type
|= SKB_GSO_DODGY
;
2818 shinfo
->gso_segs
= 0;
2821 skb
->protocol
= htons(ETH_P_IPV6
);
2822 skb_clear_hash(skb
);
2827 static int bpf_skb_proto_6_to_4(struct sk_buff
*skb
)
2829 const u32 len_diff
= sizeof(struct ipv6hdr
) - sizeof(struct iphdr
);
2830 u32 off
= skb_mac_header_len(skb
);
2833 /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */
2834 if (skb_is_gso(skb
) && unlikely(skb_is_gso_sctp(skb
)))
2837 ret
= skb_unclone(skb
, GFP_ATOMIC
);
2838 if (unlikely(ret
< 0))
2841 ret
= bpf_skb_net_hdr_pop(skb
, off
, len_diff
);
2842 if (unlikely(ret
< 0))
2845 if (skb_is_gso(skb
)) {
2846 struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2848 /* SKB_GSO_TCPV6 needs to be changed into
2851 if (shinfo
->gso_type
& SKB_GSO_TCPV6
) {
2852 shinfo
->gso_type
&= ~SKB_GSO_TCPV6
;
2853 shinfo
->gso_type
|= SKB_GSO_TCPV4
;
2856 /* Due to IPv4 header, MSS can be upgraded. */
2857 skb_increase_gso_size(shinfo
, len_diff
);
2858 /* Header must be checked, and gso_segs recomputed. */
2859 shinfo
->gso_type
|= SKB_GSO_DODGY
;
2860 shinfo
->gso_segs
= 0;
2863 skb
->protocol
= htons(ETH_P_IP
);
2864 skb_clear_hash(skb
);
2869 static int bpf_skb_proto_xlat(struct sk_buff
*skb
, __be16 to_proto
)
2871 __be16 from_proto
= skb
->protocol
;
2873 if (from_proto
== htons(ETH_P_IP
) &&
2874 to_proto
== htons(ETH_P_IPV6
))
2875 return bpf_skb_proto_4_to_6(skb
);
2877 if (from_proto
== htons(ETH_P_IPV6
) &&
2878 to_proto
== htons(ETH_P_IP
))
2879 return bpf_skb_proto_6_to_4(skb
);
2884 BPF_CALL_3(bpf_skb_change_proto
, struct sk_buff
*, skb
, __be16
, proto
,
2889 if (unlikely(flags
))
2892 /* General idea is that this helper does the basic groundwork
2893 * needed for changing the protocol, and eBPF program fills the
2894 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace()
2895 * and other helpers, rather than passing a raw buffer here.
2897 * The rationale is to keep this minimal and without a need to
2898 * deal with raw packet data. F.e. even if we would pass buffers
2899 * here, the program still needs to call the bpf_lX_csum_replace()
2900 * helpers anyway. Plus, this way we keep also separation of
2901 * concerns, since f.e. bpf_skb_store_bytes() should only take
2904 * Currently, additional options and extension header space are
2905 * not supported, but flags register is reserved so we can adapt
2906 * that. For offloads, we mark packet as dodgy, so that headers
2907 * need to be verified first.
2909 ret
= bpf_skb_proto_xlat(skb
, proto
);
2910 bpf_compute_data_pointers(skb
);
2914 static const struct bpf_func_proto bpf_skb_change_proto_proto
= {
2915 .func
= bpf_skb_change_proto
,
2917 .ret_type
= RET_INTEGER
,
2918 .arg1_type
= ARG_PTR_TO_CTX
,
2919 .arg2_type
= ARG_ANYTHING
,
2920 .arg3_type
= ARG_ANYTHING
,
2923 BPF_CALL_2(bpf_skb_change_type
, struct sk_buff
*, skb
, u32
, pkt_type
)
2925 /* We only allow a restricted subset to be changed for now. */
2926 if (unlikely(!skb_pkt_type_ok(skb
->pkt_type
) ||
2927 !skb_pkt_type_ok(pkt_type
)))
2930 skb
->pkt_type
= pkt_type
;
2934 static const struct bpf_func_proto bpf_skb_change_type_proto
= {
2935 .func
= bpf_skb_change_type
,
2937 .ret_type
= RET_INTEGER
,
2938 .arg1_type
= ARG_PTR_TO_CTX
,
2939 .arg2_type
= ARG_ANYTHING
,
2942 static u32
bpf_skb_net_base_len(const struct sk_buff
*skb
)
2944 switch (skb
->protocol
) {
2945 case htons(ETH_P_IP
):
2946 return sizeof(struct iphdr
);
2947 case htons(ETH_P_IPV6
):
2948 return sizeof(struct ipv6hdr
);
2954 static int bpf_skb_net_grow(struct sk_buff
*skb
, u32 len_diff
)
2956 u32 off
= skb_mac_header_len(skb
) + bpf_skb_net_base_len(skb
);
2959 /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */
2960 if (skb_is_gso(skb
) && unlikely(skb_is_gso_sctp(skb
)))
2963 ret
= skb_cow(skb
, len_diff
);
2964 if (unlikely(ret
< 0))
2967 ret
= bpf_skb_net_hdr_push(skb
, off
, len_diff
);
2968 if (unlikely(ret
< 0))
2971 if (skb_is_gso(skb
)) {
2972 struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2974 /* Due to header grow, MSS needs to be downgraded. */
2975 skb_decrease_gso_size(shinfo
, len_diff
);
2976 /* Header must be checked, and gso_segs recomputed. */
2977 shinfo
->gso_type
|= SKB_GSO_DODGY
;
2978 shinfo
->gso_segs
= 0;
2984 static int bpf_skb_net_shrink(struct sk_buff
*skb
, u32 len_diff
)
2986 u32 off
= skb_mac_header_len(skb
) + bpf_skb_net_base_len(skb
);
2989 /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */
2990 if (skb_is_gso(skb
) && unlikely(skb_is_gso_sctp(skb
)))
2993 ret
= skb_unclone(skb
, GFP_ATOMIC
);
2994 if (unlikely(ret
< 0))
2997 ret
= bpf_skb_net_hdr_pop(skb
, off
, len_diff
);
2998 if (unlikely(ret
< 0))
3001 if (skb_is_gso(skb
)) {
3002 struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
3004 /* Due to header shrink, MSS can be upgraded. */
3005 skb_increase_gso_size(shinfo
, len_diff
);
3006 /* Header must be checked, and gso_segs recomputed. */
3007 shinfo
->gso_type
|= SKB_GSO_DODGY
;
3008 shinfo
->gso_segs
= 0;
3014 static u32
__bpf_skb_max_len(const struct sk_buff
*skb
)
3016 return skb
->dev
? skb
->dev
->mtu
+ skb
->dev
->hard_header_len
:
3020 static int bpf_skb_adjust_net(struct sk_buff
*skb
, s32 len_diff
)
3022 bool trans_same
= skb
->transport_header
== skb
->network_header
;
3023 u32 len_cur
, len_diff_abs
= abs(len_diff
);
3024 u32 len_min
= bpf_skb_net_base_len(skb
);
3025 u32 len_max
= __bpf_skb_max_len(skb
);
3026 __be16 proto
= skb
->protocol
;
3027 bool shrink
= len_diff
< 0;
3030 if (unlikely(len_diff_abs
> 0xfffU
))
3032 if (unlikely(proto
!= htons(ETH_P_IP
) &&
3033 proto
!= htons(ETH_P_IPV6
)))
3036 len_cur
= skb
->len
- skb_network_offset(skb
);
3037 if (skb_transport_header_was_set(skb
) && !trans_same
)
3038 len_cur
= skb_network_header_len(skb
);
3039 if ((shrink
&& (len_diff_abs
>= len_cur
||
3040 len_cur
- len_diff_abs
< len_min
)) ||
3041 (!shrink
&& (skb
->len
+ len_diff_abs
> len_max
&&
3045 ret
= shrink
? bpf_skb_net_shrink(skb
, len_diff_abs
) :
3046 bpf_skb_net_grow(skb
, len_diff_abs
);
3048 bpf_compute_data_pointers(skb
);
3052 BPF_CALL_4(bpf_skb_adjust_room
, struct sk_buff
*, skb
, s32
, len_diff
,
3053 u32
, mode
, u64
, flags
)
3055 if (unlikely(flags
))
3057 if (likely(mode
== BPF_ADJ_ROOM_NET
))
3058 return bpf_skb_adjust_net(skb
, len_diff
);
3063 static const struct bpf_func_proto bpf_skb_adjust_room_proto
= {
3064 .func
= bpf_skb_adjust_room
,
3066 .ret_type
= RET_INTEGER
,
3067 .arg1_type
= ARG_PTR_TO_CTX
,
3068 .arg2_type
= ARG_ANYTHING
,
3069 .arg3_type
= ARG_ANYTHING
,
3070 .arg4_type
= ARG_ANYTHING
,
3073 static u32
__bpf_skb_min_len(const struct sk_buff
*skb
)
3075 u32 min_len
= skb_network_offset(skb
);
3077 if (skb_transport_header_was_set(skb
))
3078 min_len
= skb_transport_offset(skb
);
3079 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
3080 min_len
= skb_checksum_start_offset(skb
) +
3081 skb
->csum_offset
+ sizeof(__sum16
);
3085 static int bpf_skb_grow_rcsum(struct sk_buff
*skb
, unsigned int new_len
)
3087 unsigned int old_len
= skb
->len
;
3090 ret
= __skb_grow_rcsum(skb
, new_len
);
3092 memset(skb
->data
+ old_len
, 0, new_len
- old_len
);
3096 static int bpf_skb_trim_rcsum(struct sk_buff
*skb
, unsigned int new_len
)
3098 return __skb_trim_rcsum(skb
, new_len
);
3101 static inline int __bpf_skb_change_tail(struct sk_buff
*skb
, u32 new_len
,
3104 u32 max_len
= __bpf_skb_max_len(skb
);
3105 u32 min_len
= __bpf_skb_min_len(skb
);
3108 if (unlikely(flags
|| new_len
> max_len
|| new_len
< min_len
))
3110 if (skb
->encapsulation
)
3113 /* The basic idea of this helper is that it's performing the
3114 * needed work to either grow or trim an skb, and eBPF program
3115 * rewrites the rest via helpers like bpf_skb_store_bytes(),
3116 * bpf_lX_csum_replace() and others rather than passing a raw
3117 * buffer here. This one is a slow path helper and intended
3118 * for replies with control messages.
3120 * Like in bpf_skb_change_proto(), we want to keep this rather
3121 * minimal and without protocol specifics so that we are able
3122 * to separate concerns as in bpf_skb_store_bytes() should only
3123 * be the one responsible for writing buffers.
3125 * It's really expected to be a slow path operation here for
3126 * control message replies, so we're implicitly linearizing,
3127 * uncloning and drop offloads from the skb by this.
3129 ret
= __bpf_try_make_writable(skb
, skb
->len
);
3131 if (new_len
> skb
->len
)
3132 ret
= bpf_skb_grow_rcsum(skb
, new_len
);
3133 else if (new_len
< skb
->len
)
3134 ret
= bpf_skb_trim_rcsum(skb
, new_len
);
3135 if (!ret
&& skb_is_gso(skb
))
3141 BPF_CALL_3(bpf_skb_change_tail
, struct sk_buff
*, skb
, u32
, new_len
,
3144 int ret
= __bpf_skb_change_tail(skb
, new_len
, flags
);
3146 bpf_compute_data_pointers(skb
);
3150 static const struct bpf_func_proto bpf_skb_change_tail_proto
= {
3151 .func
= bpf_skb_change_tail
,
3153 .ret_type
= RET_INTEGER
,
3154 .arg1_type
= ARG_PTR_TO_CTX
,
3155 .arg2_type
= ARG_ANYTHING
,
3156 .arg3_type
= ARG_ANYTHING
,
3159 BPF_CALL_3(sk_skb_change_tail
, struct sk_buff
*, skb
, u32
, new_len
,
3162 int ret
= __bpf_skb_change_tail(skb
, new_len
, flags
);
3164 bpf_compute_data_end_sk_skb(skb
);
3168 static const struct bpf_func_proto sk_skb_change_tail_proto
= {
3169 .func
= sk_skb_change_tail
,
3171 .ret_type
= RET_INTEGER
,
3172 .arg1_type
= ARG_PTR_TO_CTX
,
3173 .arg2_type
= ARG_ANYTHING
,
3174 .arg3_type
= ARG_ANYTHING
,
3177 static inline int __bpf_skb_change_head(struct sk_buff
*skb
, u32 head_room
,
3180 u32 max_len
= __bpf_skb_max_len(skb
);
3181 u32 new_len
= skb
->len
+ head_room
;
3184 if (unlikely(flags
|| (!skb_is_gso(skb
) && new_len
> max_len
) ||
3185 new_len
< skb
->len
))
3188 ret
= skb_cow(skb
, head_room
);
3190 /* Idea for this helper is that we currently only
3191 * allow to expand on mac header. This means that
3192 * skb->protocol network header, etc, stay as is.
3193 * Compared to bpf_skb_change_tail(), we're more
3194 * flexible due to not needing to linearize or
3195 * reset GSO. Intention for this helper is to be
3196 * used by an L3 skb that needs to push mac header
3197 * for redirection into L2 device.
3199 __skb_push(skb
, head_room
);
3200 memset(skb
->data
, 0, head_room
);
3201 skb_reset_mac_header(skb
);
3207 BPF_CALL_3(bpf_skb_change_head
, struct sk_buff
*, skb
, u32
, head_room
,
3210 int ret
= __bpf_skb_change_head(skb
, head_room
, flags
);
3212 bpf_compute_data_pointers(skb
);
3216 static const struct bpf_func_proto bpf_skb_change_head_proto
= {
3217 .func
= bpf_skb_change_head
,
3219 .ret_type
= RET_INTEGER
,
3220 .arg1_type
= ARG_PTR_TO_CTX
,
3221 .arg2_type
= ARG_ANYTHING
,
3222 .arg3_type
= ARG_ANYTHING
,
3225 BPF_CALL_3(sk_skb_change_head
, struct sk_buff
*, skb
, u32
, head_room
,
3228 int ret
= __bpf_skb_change_head(skb
, head_room
, flags
);
3230 bpf_compute_data_end_sk_skb(skb
);
3234 static const struct bpf_func_proto sk_skb_change_head_proto
= {
3235 .func
= sk_skb_change_head
,
3237 .ret_type
= RET_INTEGER
,
3238 .arg1_type
= ARG_PTR_TO_CTX
,
3239 .arg2_type
= ARG_ANYTHING
,
3240 .arg3_type
= ARG_ANYTHING
,
3242 static unsigned long xdp_get_metalen(const struct xdp_buff
*xdp
)
3244 return xdp_data_meta_unsupported(xdp
) ? 0 :
3245 xdp
->data
- xdp
->data_meta
;
3248 BPF_CALL_2(bpf_xdp_adjust_head
, struct xdp_buff
*, xdp
, int, offset
)
3250 void *xdp_frame_end
= xdp
->data_hard_start
+ sizeof(struct xdp_frame
);
3251 unsigned long metalen
= xdp_get_metalen(xdp
);
3252 void *data_start
= xdp_frame_end
+ metalen
;
3253 void *data
= xdp
->data
+ offset
;
3255 if (unlikely(data
< data_start
||
3256 data
> xdp
->data_end
- ETH_HLEN
))
3260 memmove(xdp
->data_meta
+ offset
,
3261 xdp
->data_meta
, metalen
);
3262 xdp
->data_meta
+= offset
;
3268 static const struct bpf_func_proto bpf_xdp_adjust_head_proto
= {
3269 .func
= bpf_xdp_adjust_head
,
3271 .ret_type
= RET_INTEGER
,
3272 .arg1_type
= ARG_PTR_TO_CTX
,
3273 .arg2_type
= ARG_ANYTHING
,
3276 BPF_CALL_2(bpf_xdp_adjust_tail
, struct xdp_buff
*, xdp
, int, offset
)
3278 void *data_end
= xdp
->data_end
+ offset
;
3280 /* only shrinking is allowed for now. */
3281 if (unlikely(offset
>= 0))
3284 if (unlikely(data_end
< xdp
->data
+ ETH_HLEN
))
3287 xdp
->data_end
= data_end
;
3292 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto
= {
3293 .func
= bpf_xdp_adjust_tail
,
3295 .ret_type
= RET_INTEGER
,
3296 .arg1_type
= ARG_PTR_TO_CTX
,
3297 .arg2_type
= ARG_ANYTHING
,
3300 BPF_CALL_2(bpf_xdp_adjust_meta
, struct xdp_buff
*, xdp
, int, offset
)
3302 void *xdp_frame_end
= xdp
->data_hard_start
+ sizeof(struct xdp_frame
);
3303 void *meta
= xdp
->data_meta
+ offset
;
3304 unsigned long metalen
= xdp
->data
- meta
;
3306 if (xdp_data_meta_unsupported(xdp
))
3308 if (unlikely(meta
< xdp_frame_end
||
3311 if (unlikely((metalen
& (sizeof(__u32
) - 1)) ||
3315 xdp
->data_meta
= meta
;
3320 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto
= {
3321 .func
= bpf_xdp_adjust_meta
,
3323 .ret_type
= RET_INTEGER
,
3324 .arg1_type
= ARG_PTR_TO_CTX
,
3325 .arg2_type
= ARG_ANYTHING
,
3328 static int __bpf_tx_xdp(struct net_device
*dev
,
3329 struct bpf_map
*map
,
3330 struct xdp_buff
*xdp
,
3333 struct xdp_frame
*xdpf
;
3336 if (!dev
->netdev_ops
->ndo_xdp_xmit
) {
3340 err
= xdp_ok_fwd_dev(dev
, xdp
->data_end
- xdp
->data
);
3344 xdpf
= convert_to_xdp_frame(xdp
);
3345 if (unlikely(!xdpf
))
3348 sent
= dev
->netdev_ops
->ndo_xdp_xmit(dev
, 1, &xdpf
, XDP_XMIT_FLUSH
);
3355 xdp_do_redirect_slow(struct net_device
*dev
, struct xdp_buff
*xdp
,
3356 struct bpf_prog
*xdp_prog
, struct bpf_redirect_info
*ri
)
3358 struct net_device
*fwd
;
3359 u32 index
= ri
->ifindex
;
3362 fwd
= dev_get_by_index_rcu(dev_net(dev
), index
);
3364 if (unlikely(!fwd
)) {
3369 err
= __bpf_tx_xdp(fwd
, NULL
, xdp
, 0);
3373 _trace_xdp_redirect(dev
, xdp_prog
, index
);
3376 _trace_xdp_redirect_err(dev
, xdp_prog
, index
, err
);
3380 static int __bpf_tx_xdp_map(struct net_device
*dev_rx
, void *fwd
,
3381 struct bpf_map
*map
,
3382 struct xdp_buff
*xdp
,
3387 switch (map
->map_type
) {
3388 case BPF_MAP_TYPE_DEVMAP
: {
3389 struct bpf_dtab_netdev
*dst
= fwd
;
3391 err
= dev_map_enqueue(dst
, xdp
, dev_rx
);
3394 __dev_map_insert_ctx(map
, index
);
3397 case BPF_MAP_TYPE_CPUMAP
: {
3398 struct bpf_cpu_map_entry
*rcpu
= fwd
;
3400 err
= cpu_map_enqueue(rcpu
, xdp
, dev_rx
);
3403 __cpu_map_insert_ctx(map
, index
);
3406 case BPF_MAP_TYPE_XSKMAP
: {
3407 struct xdp_sock
*xs
= fwd
;
3409 err
= __xsk_map_redirect(map
, xdp
, xs
);
3418 void xdp_do_flush_map(void)
3420 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
3421 struct bpf_map
*map
= ri
->map_to_flush
;
3423 ri
->map_to_flush
= NULL
;
3425 switch (map
->map_type
) {
3426 case BPF_MAP_TYPE_DEVMAP
:
3427 __dev_map_flush(map
);
3429 case BPF_MAP_TYPE_CPUMAP
:
3430 __cpu_map_flush(map
);
3432 case BPF_MAP_TYPE_XSKMAP
:
3433 __xsk_map_flush(map
);
3440 EXPORT_SYMBOL_GPL(xdp_do_flush_map
);
3442 static inline void *__xdp_map_lookup_elem(struct bpf_map
*map
, u32 index
)
3444 switch (map
->map_type
) {
3445 case BPF_MAP_TYPE_DEVMAP
:
3446 return __dev_map_lookup_elem(map
, index
);
3447 case BPF_MAP_TYPE_CPUMAP
:
3448 return __cpu_map_lookup_elem(map
, index
);
3449 case BPF_MAP_TYPE_XSKMAP
:
3450 return __xsk_map_lookup_elem(map
, index
);
3456 void bpf_clear_redirect_map(struct bpf_map
*map
)
3458 struct bpf_redirect_info
*ri
;
3461 for_each_possible_cpu(cpu
) {
3462 ri
= per_cpu_ptr(&bpf_redirect_info
, cpu
);
3463 /* Avoid polluting remote cacheline due to writes if
3464 * not needed. Once we pass this test, we need the
3465 * cmpxchg() to make sure it hasn't been changed in
3466 * the meantime by remote CPU.
3468 if (unlikely(READ_ONCE(ri
->map
) == map
))
3469 cmpxchg(&ri
->map
, map
, NULL
);
3473 static int xdp_do_redirect_map(struct net_device
*dev
, struct xdp_buff
*xdp
,
3474 struct bpf_prog
*xdp_prog
, struct bpf_map
*map
,
3475 struct bpf_redirect_info
*ri
)
3477 u32 index
= ri
->ifindex
;
3482 WRITE_ONCE(ri
->map
, NULL
);
3484 fwd
= __xdp_map_lookup_elem(map
, index
);
3485 if (unlikely(!fwd
)) {
3489 if (ri
->map_to_flush
&& unlikely(ri
->map_to_flush
!= map
))
3492 err
= __bpf_tx_xdp_map(dev
, fwd
, map
, xdp
, index
);
3496 ri
->map_to_flush
= map
;
3497 _trace_xdp_redirect_map(dev
, xdp_prog
, fwd
, map
, index
);
3500 _trace_xdp_redirect_map_err(dev
, xdp_prog
, fwd
, map
, index
, err
);
3504 int xdp_do_redirect(struct net_device
*dev
, struct xdp_buff
*xdp
,
3505 struct bpf_prog
*xdp_prog
)
3507 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
3508 struct bpf_map
*map
= READ_ONCE(ri
->map
);
3511 return xdp_do_redirect_map(dev
, xdp
, xdp_prog
, map
, ri
);
3513 return xdp_do_redirect_slow(dev
, xdp
, xdp_prog
, ri
);
3515 EXPORT_SYMBOL_GPL(xdp_do_redirect
);
3517 static int xdp_do_generic_redirect_map(struct net_device
*dev
,
3518 struct sk_buff
*skb
,
3519 struct xdp_buff
*xdp
,
3520 struct bpf_prog
*xdp_prog
,
3521 struct bpf_map
*map
)
3523 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
3524 u32 index
= ri
->ifindex
;
3529 WRITE_ONCE(ri
->map
, NULL
);
3531 fwd
= __xdp_map_lookup_elem(map
, index
);
3532 if (unlikely(!fwd
)) {
3537 if (map
->map_type
== BPF_MAP_TYPE_DEVMAP
) {
3538 struct bpf_dtab_netdev
*dst
= fwd
;
3540 err
= dev_map_generic_redirect(dst
, skb
, xdp_prog
);
3543 } else if (map
->map_type
== BPF_MAP_TYPE_XSKMAP
) {
3544 struct xdp_sock
*xs
= fwd
;
3546 err
= xsk_generic_rcv(xs
, xdp
);
3551 /* TODO: Handle BPF_MAP_TYPE_CPUMAP */
3556 _trace_xdp_redirect_map(dev
, xdp_prog
, fwd
, map
, index
);
3559 _trace_xdp_redirect_map_err(dev
, xdp_prog
, fwd
, map
, index
, err
);
3563 int xdp_do_generic_redirect(struct net_device
*dev
, struct sk_buff
*skb
,
3564 struct xdp_buff
*xdp
, struct bpf_prog
*xdp_prog
)
3566 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
3567 struct bpf_map
*map
= READ_ONCE(ri
->map
);
3568 u32 index
= ri
->ifindex
;
3569 struct net_device
*fwd
;
3573 return xdp_do_generic_redirect_map(dev
, skb
, xdp
, xdp_prog
,
3576 fwd
= dev_get_by_index_rcu(dev_net(dev
), index
);
3577 if (unlikely(!fwd
)) {
3582 err
= xdp_ok_fwd_dev(fwd
, skb
->len
);
3587 _trace_xdp_redirect(dev
, xdp_prog
, index
);
3588 generic_xdp_tx(skb
, xdp_prog
);
3591 _trace_xdp_redirect_err(dev
, xdp_prog
, index
, err
);
3594 EXPORT_SYMBOL_GPL(xdp_do_generic_redirect
);
3596 BPF_CALL_2(bpf_xdp_redirect
, u32
, ifindex
, u64
, flags
)
3598 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
3600 if (unlikely(flags
))
3603 ri
->ifindex
= ifindex
;
3605 WRITE_ONCE(ri
->map
, NULL
);
3607 return XDP_REDIRECT
;
3610 static const struct bpf_func_proto bpf_xdp_redirect_proto
= {
3611 .func
= bpf_xdp_redirect
,
3613 .ret_type
= RET_INTEGER
,
3614 .arg1_type
= ARG_ANYTHING
,
3615 .arg2_type
= ARG_ANYTHING
,
3618 BPF_CALL_3(bpf_xdp_redirect_map
, struct bpf_map
*, map
, u32
, ifindex
,
3621 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
3623 if (unlikely(flags
))
3626 ri
->ifindex
= ifindex
;
3628 WRITE_ONCE(ri
->map
, map
);
3630 return XDP_REDIRECT
;
3633 static const struct bpf_func_proto bpf_xdp_redirect_map_proto
= {
3634 .func
= bpf_xdp_redirect_map
,
3636 .ret_type
= RET_INTEGER
,
3637 .arg1_type
= ARG_CONST_MAP_PTR
,
3638 .arg2_type
= ARG_ANYTHING
,
3639 .arg3_type
= ARG_ANYTHING
,
3642 static unsigned long bpf_skb_copy(void *dst_buff
, const void *skb
,
3643 unsigned long off
, unsigned long len
)
3645 void *ptr
= skb_header_pointer(skb
, off
, len
, dst_buff
);
3649 if (ptr
!= dst_buff
)
3650 memcpy(dst_buff
, ptr
, len
);
3655 BPF_CALL_5(bpf_skb_event_output
, struct sk_buff
*, skb
, struct bpf_map
*, map
,
3656 u64
, flags
, void *, meta
, u64
, meta_size
)
3658 u64 skb_size
= (flags
& BPF_F_CTXLEN_MASK
) >> 32;
3660 if (unlikely(flags
& ~(BPF_F_CTXLEN_MASK
| BPF_F_INDEX_MASK
)))
3662 if (unlikely(skb_size
> skb
->len
))
3665 return bpf_event_output(map
, flags
, meta
, meta_size
, skb
, skb_size
,
3669 static const struct bpf_func_proto bpf_skb_event_output_proto
= {
3670 .func
= bpf_skb_event_output
,
3672 .ret_type
= RET_INTEGER
,
3673 .arg1_type
= ARG_PTR_TO_CTX
,
3674 .arg2_type
= ARG_CONST_MAP_PTR
,
3675 .arg3_type
= ARG_ANYTHING
,
3676 .arg4_type
= ARG_PTR_TO_MEM
,
3677 .arg5_type
= ARG_CONST_SIZE_OR_ZERO
,
3680 static unsigned short bpf_tunnel_key_af(u64 flags
)
3682 return flags
& BPF_F_TUNINFO_IPV6
? AF_INET6
: AF_INET
;
3685 BPF_CALL_4(bpf_skb_get_tunnel_key
, struct sk_buff
*, skb
, struct bpf_tunnel_key
*, to
,
3686 u32
, size
, u64
, flags
)
3688 const struct ip_tunnel_info
*info
= skb_tunnel_info(skb
);
3689 u8 compat
[sizeof(struct bpf_tunnel_key
)];
3693 if (unlikely(!info
|| (flags
& ~(BPF_F_TUNINFO_IPV6
)))) {
3697 if (ip_tunnel_info_af(info
) != bpf_tunnel_key_af(flags
)) {
3701 if (unlikely(size
!= sizeof(struct bpf_tunnel_key
))) {
3704 case offsetof(struct bpf_tunnel_key
, tunnel_label
):
3705 case offsetof(struct bpf_tunnel_key
, tunnel_ext
):
3707 case offsetof(struct bpf_tunnel_key
, remote_ipv6
[1]):
3708 /* Fixup deprecated structure layouts here, so we have
3709 * a common path later on.
3711 if (ip_tunnel_info_af(info
) != AF_INET
)
3714 to
= (struct bpf_tunnel_key
*)compat
;
3721 to
->tunnel_id
= be64_to_cpu(info
->key
.tun_id
);
3722 to
->tunnel_tos
= info
->key
.tos
;
3723 to
->tunnel_ttl
= info
->key
.ttl
;
3726 if (flags
& BPF_F_TUNINFO_IPV6
) {
3727 memcpy(to
->remote_ipv6
, &info
->key
.u
.ipv6
.src
,
3728 sizeof(to
->remote_ipv6
));
3729 to
->tunnel_label
= be32_to_cpu(info
->key
.label
);
3731 to
->remote_ipv4
= be32_to_cpu(info
->key
.u
.ipv4
.src
);
3732 memset(&to
->remote_ipv6
[1], 0, sizeof(__u32
) * 3);
3733 to
->tunnel_label
= 0;
3736 if (unlikely(size
!= sizeof(struct bpf_tunnel_key
)))
3737 memcpy(to_orig
, to
, size
);
3741 memset(to_orig
, 0, size
);
3745 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto
= {
3746 .func
= bpf_skb_get_tunnel_key
,
3748 .ret_type
= RET_INTEGER
,
3749 .arg1_type
= ARG_PTR_TO_CTX
,
3750 .arg2_type
= ARG_PTR_TO_UNINIT_MEM
,
3751 .arg3_type
= ARG_CONST_SIZE
,
3752 .arg4_type
= ARG_ANYTHING
,
3755 BPF_CALL_3(bpf_skb_get_tunnel_opt
, struct sk_buff
*, skb
, u8
*, to
, u32
, size
)
3757 const struct ip_tunnel_info
*info
= skb_tunnel_info(skb
);
3760 if (unlikely(!info
||
3761 !(info
->key
.tun_flags
& TUNNEL_OPTIONS_PRESENT
))) {
3765 if (unlikely(size
< info
->options_len
)) {
3770 ip_tunnel_info_opts_get(to
, info
);
3771 if (size
> info
->options_len
)
3772 memset(to
+ info
->options_len
, 0, size
- info
->options_len
);
3774 return info
->options_len
;
3776 memset(to
, 0, size
);
3780 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto
= {
3781 .func
= bpf_skb_get_tunnel_opt
,
3783 .ret_type
= RET_INTEGER
,
3784 .arg1_type
= ARG_PTR_TO_CTX
,
3785 .arg2_type
= ARG_PTR_TO_UNINIT_MEM
,
3786 .arg3_type
= ARG_CONST_SIZE
,
3789 static struct metadata_dst __percpu
*md_dst
;
3791 BPF_CALL_4(bpf_skb_set_tunnel_key
, struct sk_buff
*, skb
,
3792 const struct bpf_tunnel_key
*, from
, u32
, size
, u64
, flags
)
3794 struct metadata_dst
*md
= this_cpu_ptr(md_dst
);
3795 u8 compat
[sizeof(struct bpf_tunnel_key
)];
3796 struct ip_tunnel_info
*info
;
3798 if (unlikely(flags
& ~(BPF_F_TUNINFO_IPV6
| BPF_F_ZERO_CSUM_TX
|
3799 BPF_F_DONT_FRAGMENT
| BPF_F_SEQ_NUMBER
)))
3801 if (unlikely(size
!= sizeof(struct bpf_tunnel_key
))) {
3803 case offsetof(struct bpf_tunnel_key
, tunnel_label
):
3804 case offsetof(struct bpf_tunnel_key
, tunnel_ext
):
3805 case offsetof(struct bpf_tunnel_key
, remote_ipv6
[1]):
3806 /* Fixup deprecated structure layouts here, so we have
3807 * a common path later on.
3809 memcpy(compat
, from
, size
);
3810 memset(compat
+ size
, 0, sizeof(compat
) - size
);
3811 from
= (const struct bpf_tunnel_key
*) compat
;
3817 if (unlikely((!(flags
& BPF_F_TUNINFO_IPV6
) && from
->tunnel_label
) ||
3822 dst_hold((struct dst_entry
*) md
);
3823 skb_dst_set(skb
, (struct dst_entry
*) md
);
3825 info
= &md
->u
.tun_info
;
3826 memset(info
, 0, sizeof(*info
));
3827 info
->mode
= IP_TUNNEL_INFO_TX
;
3829 info
->key
.tun_flags
= TUNNEL_KEY
| TUNNEL_CSUM
| TUNNEL_NOCACHE
;
3830 if (flags
& BPF_F_DONT_FRAGMENT
)
3831 info
->key
.tun_flags
|= TUNNEL_DONT_FRAGMENT
;
3832 if (flags
& BPF_F_ZERO_CSUM_TX
)
3833 info
->key
.tun_flags
&= ~TUNNEL_CSUM
;
3834 if (flags
& BPF_F_SEQ_NUMBER
)
3835 info
->key
.tun_flags
|= TUNNEL_SEQ
;
3837 info
->key
.tun_id
= cpu_to_be64(from
->tunnel_id
);
3838 info
->key
.tos
= from
->tunnel_tos
;
3839 info
->key
.ttl
= from
->tunnel_ttl
;
3841 if (flags
& BPF_F_TUNINFO_IPV6
) {
3842 info
->mode
|= IP_TUNNEL_INFO_IPV6
;
3843 memcpy(&info
->key
.u
.ipv6
.dst
, from
->remote_ipv6
,
3844 sizeof(from
->remote_ipv6
));
3845 info
->key
.label
= cpu_to_be32(from
->tunnel_label
) &
3846 IPV6_FLOWLABEL_MASK
;
3848 info
->key
.u
.ipv4
.dst
= cpu_to_be32(from
->remote_ipv4
);
3854 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto
= {
3855 .func
= bpf_skb_set_tunnel_key
,
3857 .ret_type
= RET_INTEGER
,
3858 .arg1_type
= ARG_PTR_TO_CTX
,
3859 .arg2_type
= ARG_PTR_TO_MEM
,
3860 .arg3_type
= ARG_CONST_SIZE
,
3861 .arg4_type
= ARG_ANYTHING
,
3864 BPF_CALL_3(bpf_skb_set_tunnel_opt
, struct sk_buff
*, skb
,
3865 const u8
*, from
, u32
, size
)
3867 struct ip_tunnel_info
*info
= skb_tunnel_info(skb
);
3868 const struct metadata_dst
*md
= this_cpu_ptr(md_dst
);
3870 if (unlikely(info
!= &md
->u
.tun_info
|| (size
& (sizeof(u32
) - 1))))
3872 if (unlikely(size
> IP_TUNNEL_OPTS_MAX
))
3875 ip_tunnel_info_opts_set(info
, from
, size
, TUNNEL_OPTIONS_PRESENT
);
3880 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto
= {
3881 .func
= bpf_skb_set_tunnel_opt
,
3883 .ret_type
= RET_INTEGER
,
3884 .arg1_type
= ARG_PTR_TO_CTX
,
3885 .arg2_type
= ARG_PTR_TO_MEM
,
3886 .arg3_type
= ARG_CONST_SIZE
,
3889 static const struct bpf_func_proto
*
3890 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which
)
3893 struct metadata_dst __percpu
*tmp
;
3895 tmp
= metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX
,
3900 if (cmpxchg(&md_dst
, NULL
, tmp
))
3901 metadata_dst_free_percpu(tmp
);
3905 case BPF_FUNC_skb_set_tunnel_key
:
3906 return &bpf_skb_set_tunnel_key_proto
;
3907 case BPF_FUNC_skb_set_tunnel_opt
:
3908 return &bpf_skb_set_tunnel_opt_proto
;
3914 BPF_CALL_3(bpf_skb_under_cgroup
, struct sk_buff
*, skb
, struct bpf_map
*, map
,
3917 struct bpf_array
*array
= container_of(map
, struct bpf_array
, map
);
3918 struct cgroup
*cgrp
;
3921 sk
= skb_to_full_sk(skb
);
3922 if (!sk
|| !sk_fullsock(sk
))
3924 if (unlikely(idx
>= array
->map
.max_entries
))
3927 cgrp
= READ_ONCE(array
->ptrs
[idx
]);
3928 if (unlikely(!cgrp
))
3931 return sk_under_cgroup_hierarchy(sk
, cgrp
);
3934 static const struct bpf_func_proto bpf_skb_under_cgroup_proto
= {
3935 .func
= bpf_skb_under_cgroup
,
3937 .ret_type
= RET_INTEGER
,
3938 .arg1_type
= ARG_PTR_TO_CTX
,
3939 .arg2_type
= ARG_CONST_MAP_PTR
,
3940 .arg3_type
= ARG_ANYTHING
,
3943 #ifdef CONFIG_SOCK_CGROUP_DATA
3944 BPF_CALL_1(bpf_skb_cgroup_id
, const struct sk_buff
*, skb
)
3946 struct sock
*sk
= skb_to_full_sk(skb
);
3947 struct cgroup
*cgrp
;
3949 if (!sk
|| !sk_fullsock(sk
))
3952 cgrp
= sock_cgroup_ptr(&sk
->sk_cgrp_data
);
3953 return cgrp
->kn
->id
.id
;
3956 static const struct bpf_func_proto bpf_skb_cgroup_id_proto
= {
3957 .func
= bpf_skb_cgroup_id
,
3959 .ret_type
= RET_INTEGER
,
3960 .arg1_type
= ARG_PTR_TO_CTX
,
3963 BPF_CALL_2(bpf_skb_ancestor_cgroup_id
, const struct sk_buff
*, skb
, int,
3966 struct sock
*sk
= skb_to_full_sk(skb
);
3967 struct cgroup
*ancestor
;
3968 struct cgroup
*cgrp
;
3970 if (!sk
|| !sk_fullsock(sk
))
3973 cgrp
= sock_cgroup_ptr(&sk
->sk_cgrp_data
);
3974 ancestor
= cgroup_ancestor(cgrp
, ancestor_level
);
3978 return ancestor
->kn
->id
.id
;
3981 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto
= {
3982 .func
= bpf_skb_ancestor_cgroup_id
,
3984 .ret_type
= RET_INTEGER
,
3985 .arg1_type
= ARG_PTR_TO_CTX
,
3986 .arg2_type
= ARG_ANYTHING
,
3990 static unsigned long bpf_xdp_copy(void *dst_buff
, const void *src_buff
,
3991 unsigned long off
, unsigned long len
)
3993 memcpy(dst_buff
, src_buff
+ off
, len
);
3997 BPF_CALL_5(bpf_xdp_event_output
, struct xdp_buff
*, xdp
, struct bpf_map
*, map
,
3998 u64
, flags
, void *, meta
, u64
, meta_size
)
4000 u64 xdp_size
= (flags
& BPF_F_CTXLEN_MASK
) >> 32;
4002 if (unlikely(flags
& ~(BPF_F_CTXLEN_MASK
| BPF_F_INDEX_MASK
)))
4004 if (unlikely(xdp_size
> (unsigned long)(xdp
->data_end
- xdp
->data
)))
4007 return bpf_event_output(map
, flags
, meta
, meta_size
, xdp
->data
,
4008 xdp_size
, bpf_xdp_copy
);
4011 static const struct bpf_func_proto bpf_xdp_event_output_proto
= {
4012 .func
= bpf_xdp_event_output
,
4014 .ret_type
= RET_INTEGER
,
4015 .arg1_type
= ARG_PTR_TO_CTX
,
4016 .arg2_type
= ARG_CONST_MAP_PTR
,
4017 .arg3_type
= ARG_ANYTHING
,
4018 .arg4_type
= ARG_PTR_TO_MEM
,
4019 .arg5_type
= ARG_CONST_SIZE_OR_ZERO
,
4022 BPF_CALL_1(bpf_get_socket_cookie
, struct sk_buff
*, skb
)
4024 return skb
->sk
? sock_gen_cookie(skb
->sk
) : 0;
4027 static const struct bpf_func_proto bpf_get_socket_cookie_proto
= {
4028 .func
= bpf_get_socket_cookie
,
4030 .ret_type
= RET_INTEGER
,
4031 .arg1_type
= ARG_PTR_TO_CTX
,
4034 BPF_CALL_1(bpf_get_socket_cookie_sock_addr
, struct bpf_sock_addr_kern
*, ctx
)
4036 return sock_gen_cookie(ctx
->sk
);
4039 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto
= {
4040 .func
= bpf_get_socket_cookie_sock_addr
,
4042 .ret_type
= RET_INTEGER
,
4043 .arg1_type
= ARG_PTR_TO_CTX
,
4046 BPF_CALL_1(bpf_get_socket_cookie_sock_ops
, struct bpf_sock_ops_kern
*, ctx
)
4048 return sock_gen_cookie(ctx
->sk
);
4051 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto
= {
4052 .func
= bpf_get_socket_cookie_sock_ops
,
4054 .ret_type
= RET_INTEGER
,
4055 .arg1_type
= ARG_PTR_TO_CTX
,
4058 BPF_CALL_1(bpf_get_socket_uid
, struct sk_buff
*, skb
)
4060 struct sock
*sk
= sk_to_full_sk(skb
->sk
);
4063 if (!sk
|| !sk_fullsock(sk
))
4065 kuid
= sock_net_uid(sock_net(sk
), sk
);
4066 return from_kuid_munged(sock_net(sk
)->user_ns
, kuid
);
4069 static const struct bpf_func_proto bpf_get_socket_uid_proto
= {
4070 .func
= bpf_get_socket_uid
,
4072 .ret_type
= RET_INTEGER
,
4073 .arg1_type
= ARG_PTR_TO_CTX
,
4076 BPF_CALL_5(bpf_sockopt_event_output
, struct bpf_sock_ops_kern
*, bpf_sock
,
4077 struct bpf_map
*, map
, u64
, flags
, void *, data
, u64
, size
)
4079 if (unlikely(flags
& ~(BPF_F_INDEX_MASK
)))
4082 return bpf_event_output(map
, flags
, data
, size
, NULL
, 0, NULL
);
4085 static const struct bpf_func_proto bpf_sockopt_event_output_proto
= {
4086 .func
= bpf_sockopt_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 BPF_CALL_5(bpf_setsockopt
, struct bpf_sock_ops_kern
*, bpf_sock
,
4097 int, level
, int, optname
, char *, optval
, int, optlen
)
4099 struct sock
*sk
= bpf_sock
->sk
;
4103 if (!sk_fullsock(sk
))
4106 if (level
== SOL_SOCKET
) {
4107 if (optlen
!= sizeof(int))
4109 val
= *((int *)optval
);
4111 /* Only some socketops are supported */
4114 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
4115 sk
->sk_rcvbuf
= max_t(int, val
* 2, SOCK_MIN_RCVBUF
);
4118 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
4119 sk
->sk_sndbuf
= max_t(int, val
* 2, SOCK_MIN_SNDBUF
);
4121 case SO_MAX_PACING_RATE
: /* 32bit version */
4122 sk
->sk_max_pacing_rate
= (val
== ~0U) ? ~0UL : val
;
4123 sk
->sk_pacing_rate
= min(sk
->sk_pacing_rate
,
4124 sk
->sk_max_pacing_rate
);
4127 sk
->sk_priority
= val
;
4132 sk
->sk_rcvlowat
= val
? : 1;
4141 } else if (level
== SOL_IP
) {
4142 if (optlen
!= sizeof(int) || sk
->sk_family
!= AF_INET
)
4145 val
= *((int *)optval
);
4146 /* Only some options are supported */
4149 if (val
< -1 || val
> 0xff) {
4152 struct inet_sock
*inet
= inet_sk(sk
);
4162 #if IS_ENABLED(CONFIG_IPV6)
4163 } else if (level
== SOL_IPV6
) {
4164 if (optlen
!= sizeof(int) || sk
->sk_family
!= AF_INET6
)
4167 val
= *((int *)optval
);
4168 /* Only some options are supported */
4171 if (val
< -1 || val
> 0xff) {
4174 struct ipv6_pinfo
*np
= inet6_sk(sk
);
4185 } else if (level
== SOL_TCP
&&
4186 sk
->sk_prot
->setsockopt
== tcp_setsockopt
) {
4187 if (optname
== TCP_CONGESTION
) {
4188 char name
[TCP_CA_NAME_MAX
];
4189 bool reinit
= bpf_sock
->op
> BPF_SOCK_OPS_NEEDS_ECN
;
4191 strncpy(name
, optval
, min_t(long, optlen
,
4192 TCP_CA_NAME_MAX
-1));
4193 name
[TCP_CA_NAME_MAX
-1] = 0;
4194 ret
= tcp_set_congestion_control(sk
, name
, false,
4197 struct tcp_sock
*tp
= tcp_sk(sk
);
4199 if (optlen
!= sizeof(int))
4202 val
= *((int *)optval
);
4203 /* Only some options are supported */
4206 if (val
<= 0 || tp
->data_segs_out
> 0)
4211 case TCP_BPF_SNDCWND_CLAMP
:
4215 tp
->snd_cwnd_clamp
= val
;
4216 tp
->snd_ssthresh
= val
;
4220 if (val
< 0 || val
> 1)
4236 static const struct bpf_func_proto bpf_setsockopt_proto
= {
4237 .func
= bpf_setsockopt
,
4239 .ret_type
= RET_INTEGER
,
4240 .arg1_type
= ARG_PTR_TO_CTX
,
4241 .arg2_type
= ARG_ANYTHING
,
4242 .arg3_type
= ARG_ANYTHING
,
4243 .arg4_type
= ARG_PTR_TO_MEM
,
4244 .arg5_type
= ARG_CONST_SIZE
,
4247 BPF_CALL_5(bpf_getsockopt
, struct bpf_sock_ops_kern
*, bpf_sock
,
4248 int, level
, int, optname
, char *, optval
, int, optlen
)
4250 struct sock
*sk
= bpf_sock
->sk
;
4252 if (!sk_fullsock(sk
))
4255 if (level
== SOL_TCP
&& sk
->sk_prot
->getsockopt
== tcp_getsockopt
) {
4256 struct inet_connection_sock
*icsk
;
4257 struct tcp_sock
*tp
;
4260 case TCP_CONGESTION
:
4261 icsk
= inet_csk(sk
);
4263 if (!icsk
->icsk_ca_ops
|| optlen
<= 1)
4265 strncpy(optval
, icsk
->icsk_ca_ops
->name
, optlen
);
4266 optval
[optlen
- 1] = 0;
4271 if (optlen
<= 0 || !tp
->saved_syn
||
4272 optlen
> tp
->saved_syn
[0])
4274 memcpy(optval
, tp
->saved_syn
+ 1, optlen
);
4279 } else if (level
== SOL_IP
) {
4280 struct inet_sock
*inet
= inet_sk(sk
);
4282 if (optlen
!= sizeof(int) || sk
->sk_family
!= AF_INET
)
4285 /* Only some options are supported */
4288 *((int *)optval
) = (int)inet
->tos
;
4293 #if IS_ENABLED(CONFIG_IPV6)
4294 } else if (level
== SOL_IPV6
) {
4295 struct ipv6_pinfo
*np
= inet6_sk(sk
);
4297 if (optlen
!= sizeof(int) || sk
->sk_family
!= AF_INET6
)
4300 /* Only some options are supported */
4303 *((int *)optval
) = (int)np
->tclass
;
4315 memset(optval
, 0, optlen
);
4319 static const struct bpf_func_proto bpf_getsockopt_proto
= {
4320 .func
= bpf_getsockopt
,
4322 .ret_type
= RET_INTEGER
,
4323 .arg1_type
= ARG_PTR_TO_CTX
,
4324 .arg2_type
= ARG_ANYTHING
,
4325 .arg3_type
= ARG_ANYTHING
,
4326 .arg4_type
= ARG_PTR_TO_UNINIT_MEM
,
4327 .arg5_type
= ARG_CONST_SIZE
,
4330 BPF_CALL_2(bpf_sock_ops_cb_flags_set
, struct bpf_sock_ops_kern
*, bpf_sock
,
4333 struct sock
*sk
= bpf_sock
->sk
;
4334 int val
= argval
& BPF_SOCK_OPS_ALL_CB_FLAGS
;
4336 if (!IS_ENABLED(CONFIG_INET
) || !sk_fullsock(sk
))
4340 tcp_sk(sk
)->bpf_sock_ops_cb_flags
= val
;
4342 return argval
& (~BPF_SOCK_OPS_ALL_CB_FLAGS
);
4345 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto
= {
4346 .func
= bpf_sock_ops_cb_flags_set
,
4348 .ret_type
= RET_INTEGER
,
4349 .arg1_type
= ARG_PTR_TO_CTX
,
4350 .arg2_type
= ARG_ANYTHING
,
4353 const struct ipv6_bpf_stub
*ipv6_bpf_stub __read_mostly
;
4354 EXPORT_SYMBOL_GPL(ipv6_bpf_stub
);
4356 BPF_CALL_3(bpf_bind
, struct bpf_sock_addr_kern
*, ctx
, struct sockaddr
*, addr
,
4360 struct sock
*sk
= ctx
->sk
;
4363 /* Binding to port can be expensive so it's prohibited in the helper.
4364 * Only binding to IP is supported.
4367 if (addr
->sa_family
== AF_INET
) {
4368 if (addr_len
< sizeof(struct sockaddr_in
))
4370 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
4372 return __inet_bind(sk
, addr
, addr_len
, true, false);
4373 #if IS_ENABLED(CONFIG_IPV6)
4374 } else if (addr
->sa_family
== AF_INET6
) {
4375 if (addr_len
< SIN6_LEN_RFC2133
)
4377 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
4379 /* ipv6_bpf_stub cannot be NULL, since it's called from
4380 * bpf_cgroup_inet6_connect hook and ipv6 is already loaded
4382 return ipv6_bpf_stub
->inet6_bind(sk
, addr
, addr_len
, true, false);
4383 #endif /* CONFIG_IPV6 */
4385 #endif /* CONFIG_INET */
4387 return -EAFNOSUPPORT
;
4390 static const struct bpf_func_proto bpf_bind_proto
= {
4393 .ret_type
= RET_INTEGER
,
4394 .arg1_type
= ARG_PTR_TO_CTX
,
4395 .arg2_type
= ARG_PTR_TO_MEM
,
4396 .arg3_type
= ARG_CONST_SIZE
,
4400 BPF_CALL_5(bpf_skb_get_xfrm_state
, struct sk_buff
*, skb
, u32
, index
,
4401 struct bpf_xfrm_state
*, to
, u32
, size
, u64
, flags
)
4403 const struct sec_path
*sp
= skb_sec_path(skb
);
4404 const struct xfrm_state
*x
;
4406 if (!sp
|| unlikely(index
>= sp
->len
|| flags
))
4409 x
= sp
->xvec
[index
];
4411 if (unlikely(size
!= sizeof(struct bpf_xfrm_state
)))
4414 to
->reqid
= x
->props
.reqid
;
4415 to
->spi
= x
->id
.spi
;
4416 to
->family
= x
->props
.family
;
4419 if (to
->family
== AF_INET6
) {
4420 memcpy(to
->remote_ipv6
, x
->props
.saddr
.a6
,
4421 sizeof(to
->remote_ipv6
));
4423 to
->remote_ipv4
= x
->props
.saddr
.a4
;
4424 memset(&to
->remote_ipv6
[1], 0, sizeof(__u32
) * 3);
4429 memset(to
, 0, size
);
4433 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto
= {
4434 .func
= bpf_skb_get_xfrm_state
,
4436 .ret_type
= RET_INTEGER
,
4437 .arg1_type
= ARG_PTR_TO_CTX
,
4438 .arg2_type
= ARG_ANYTHING
,
4439 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
4440 .arg4_type
= ARG_CONST_SIZE
,
4441 .arg5_type
= ARG_ANYTHING
,
4445 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6)
4446 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup
*params
,
4447 const struct neighbour
*neigh
,
4448 const struct net_device
*dev
)
4450 memcpy(params
->dmac
, neigh
->ha
, ETH_ALEN
);
4451 memcpy(params
->smac
, dev
->dev_addr
, ETH_ALEN
);
4452 params
->h_vlan_TCI
= 0;
4453 params
->h_vlan_proto
= 0;
4454 params
->ifindex
= dev
->ifindex
;
4460 #if IS_ENABLED(CONFIG_INET)
4461 static int bpf_ipv4_fib_lookup(struct net
*net
, struct bpf_fib_lookup
*params
,
4462 u32 flags
, bool check_mtu
)
4464 struct in_device
*in_dev
;
4465 struct neighbour
*neigh
;
4466 struct net_device
*dev
;
4467 struct fib_result res
;
4473 dev
= dev_get_by_index_rcu(net
, params
->ifindex
);
4477 /* verify forwarding is enabled on this interface */
4478 in_dev
= __in_dev_get_rcu(dev
);
4479 if (unlikely(!in_dev
|| !IN_DEV_FORWARD(in_dev
)))
4480 return BPF_FIB_LKUP_RET_FWD_DISABLED
;
4482 if (flags
& BPF_FIB_LOOKUP_OUTPUT
) {
4484 fl4
.flowi4_oif
= params
->ifindex
;
4486 fl4
.flowi4_iif
= params
->ifindex
;
4489 fl4
.flowi4_tos
= params
->tos
& IPTOS_RT_MASK
;
4490 fl4
.flowi4_scope
= RT_SCOPE_UNIVERSE
;
4491 fl4
.flowi4_flags
= 0;
4493 fl4
.flowi4_proto
= params
->l4_protocol
;
4494 fl4
.daddr
= params
->ipv4_dst
;
4495 fl4
.saddr
= params
->ipv4_src
;
4496 fl4
.fl4_sport
= params
->sport
;
4497 fl4
.fl4_dport
= params
->dport
;
4499 if (flags
& BPF_FIB_LOOKUP_DIRECT
) {
4500 u32 tbid
= l3mdev_fib_table_rcu(dev
) ? : RT_TABLE_MAIN
;
4501 struct fib_table
*tb
;
4503 tb
= fib_get_table(net
, tbid
);
4505 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4507 err
= fib_table_lookup(tb
, &fl4
, &res
, FIB_LOOKUP_NOREF
);
4509 fl4
.flowi4_mark
= 0;
4510 fl4
.flowi4_secid
= 0;
4511 fl4
.flowi4_tun_key
.tun_id
= 0;
4512 fl4
.flowi4_uid
= sock_net_uid(net
, NULL
);
4514 err
= fib_lookup(net
, &fl4
, &res
, FIB_LOOKUP_NOREF
);
4518 /* map fib lookup errors to RTN_ type */
4520 return BPF_FIB_LKUP_RET_BLACKHOLE
;
4521 if (err
== -EHOSTUNREACH
)
4522 return BPF_FIB_LKUP_RET_UNREACHABLE
;
4524 return BPF_FIB_LKUP_RET_PROHIBIT
;
4526 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4529 if (res
.type
!= RTN_UNICAST
)
4530 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4532 if (res
.fi
->fib_nhs
> 1)
4533 fib_select_path(net
, &res
, &fl4
, NULL
);
4536 mtu
= ip_mtu_from_fib_result(&res
, params
->ipv4_dst
);
4537 if (params
->tot_len
> mtu
)
4538 return BPF_FIB_LKUP_RET_FRAG_NEEDED
;
4541 nh
= &res
.fi
->fib_nh
[res
.nh_sel
];
4543 /* do not handle lwt encaps right now */
4544 if (nh
->nh_lwtstate
)
4545 return BPF_FIB_LKUP_RET_UNSUPP_LWT
;
4549 params
->ipv4_dst
= nh
->nh_gw
;
4551 params
->rt_metric
= res
.fi
->fib_priority
;
4553 /* xdp and cls_bpf programs are run in RCU-bh so
4554 * rcu_read_lock_bh is not needed here
4556 neigh
= __ipv4_neigh_lookup_noref(dev
, (__force u32
)params
->ipv4_dst
);
4558 return BPF_FIB_LKUP_RET_NO_NEIGH
;
4560 return bpf_fib_set_fwd_params(params
, neigh
, dev
);
4564 #if IS_ENABLED(CONFIG_IPV6)
4565 static int bpf_ipv6_fib_lookup(struct net
*net
, struct bpf_fib_lookup
*params
,
4566 u32 flags
, bool check_mtu
)
4568 struct in6_addr
*src
= (struct in6_addr
*) params
->ipv6_src
;
4569 struct in6_addr
*dst
= (struct in6_addr
*) params
->ipv6_dst
;
4570 struct neighbour
*neigh
;
4571 struct net_device
*dev
;
4572 struct inet6_dev
*idev
;
4573 struct fib6_info
*f6i
;
4579 /* link local addresses are never forwarded */
4580 if (rt6_need_strict(dst
) || rt6_need_strict(src
))
4581 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4583 dev
= dev_get_by_index_rcu(net
, params
->ifindex
);
4587 idev
= __in6_dev_get_safely(dev
);
4588 if (unlikely(!idev
|| !net
->ipv6
.devconf_all
->forwarding
))
4589 return BPF_FIB_LKUP_RET_FWD_DISABLED
;
4591 if (flags
& BPF_FIB_LOOKUP_OUTPUT
) {
4593 oif
= fl6
.flowi6_oif
= params
->ifindex
;
4595 oif
= fl6
.flowi6_iif
= params
->ifindex
;
4597 strict
= RT6_LOOKUP_F_HAS_SADDR
;
4599 fl6
.flowlabel
= params
->flowinfo
;
4600 fl6
.flowi6_scope
= 0;
4601 fl6
.flowi6_flags
= 0;
4604 fl6
.flowi6_proto
= params
->l4_protocol
;
4607 fl6
.fl6_sport
= params
->sport
;
4608 fl6
.fl6_dport
= params
->dport
;
4610 if (flags
& BPF_FIB_LOOKUP_DIRECT
) {
4611 u32 tbid
= l3mdev_fib_table_rcu(dev
) ? : RT_TABLE_MAIN
;
4612 struct fib6_table
*tb
;
4614 tb
= ipv6_stub
->fib6_get_table(net
, tbid
);
4616 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4618 f6i
= ipv6_stub
->fib6_table_lookup(net
, tb
, oif
, &fl6
, strict
);
4620 fl6
.flowi6_mark
= 0;
4621 fl6
.flowi6_secid
= 0;
4622 fl6
.flowi6_tun_key
.tun_id
= 0;
4623 fl6
.flowi6_uid
= sock_net_uid(net
, NULL
);
4625 f6i
= ipv6_stub
->fib6_lookup(net
, oif
, &fl6
, strict
);
4628 if (unlikely(IS_ERR_OR_NULL(f6i
) || f6i
== net
->ipv6
.fib6_null_entry
))
4629 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4631 if (unlikely(f6i
->fib6_flags
& RTF_REJECT
)) {
4632 switch (f6i
->fib6_type
) {
4634 return BPF_FIB_LKUP_RET_BLACKHOLE
;
4635 case RTN_UNREACHABLE
:
4636 return BPF_FIB_LKUP_RET_UNREACHABLE
;
4638 return BPF_FIB_LKUP_RET_PROHIBIT
;
4640 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4644 if (f6i
->fib6_type
!= RTN_UNICAST
)
4645 return BPF_FIB_LKUP_RET_NOT_FWDED
;
4647 if (f6i
->fib6_nsiblings
&& fl6
.flowi6_oif
== 0)
4648 f6i
= ipv6_stub
->fib6_multipath_select(net
, f6i
, &fl6
,
4649 fl6
.flowi6_oif
, NULL
,
4653 mtu
= ipv6_stub
->ip6_mtu_from_fib6(f6i
, dst
, src
);
4654 if (params
->tot_len
> mtu
)
4655 return BPF_FIB_LKUP_RET_FRAG_NEEDED
;
4658 if (f6i
->fib6_nh
.nh_lwtstate
)
4659 return BPF_FIB_LKUP_RET_UNSUPP_LWT
;
4661 if (f6i
->fib6_flags
& RTF_GATEWAY
)
4662 *dst
= f6i
->fib6_nh
.nh_gw
;
4664 dev
= f6i
->fib6_nh
.nh_dev
;
4665 params
->rt_metric
= f6i
->fib6_metric
;
4667 /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is
4668 * not needed here. Can not use __ipv6_neigh_lookup_noref here
4669 * because we need to get nd_tbl via the stub
4671 neigh
= ___neigh_lookup_noref(ipv6_stub
->nd_tbl
, neigh_key_eq128
,
4672 ndisc_hashfn
, dst
, dev
);
4674 return BPF_FIB_LKUP_RET_NO_NEIGH
;
4676 return bpf_fib_set_fwd_params(params
, neigh
, dev
);
4680 BPF_CALL_4(bpf_xdp_fib_lookup
, struct xdp_buff
*, ctx
,
4681 struct bpf_fib_lookup
*, params
, int, plen
, u32
, flags
)
4683 if (plen
< sizeof(*params
))
4686 if (flags
& ~(BPF_FIB_LOOKUP_DIRECT
| BPF_FIB_LOOKUP_OUTPUT
))
4689 switch (params
->family
) {
4690 #if IS_ENABLED(CONFIG_INET)
4692 return bpf_ipv4_fib_lookup(dev_net(ctx
->rxq
->dev
), params
,
4695 #if IS_ENABLED(CONFIG_IPV6)
4697 return bpf_ipv6_fib_lookup(dev_net(ctx
->rxq
->dev
), params
,
4701 return -EAFNOSUPPORT
;
4704 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto
= {
4705 .func
= bpf_xdp_fib_lookup
,
4707 .ret_type
= RET_INTEGER
,
4708 .arg1_type
= ARG_PTR_TO_CTX
,
4709 .arg2_type
= ARG_PTR_TO_MEM
,
4710 .arg3_type
= ARG_CONST_SIZE
,
4711 .arg4_type
= ARG_ANYTHING
,
4714 BPF_CALL_4(bpf_skb_fib_lookup
, struct sk_buff
*, skb
,
4715 struct bpf_fib_lookup
*, params
, int, plen
, u32
, flags
)
4717 struct net
*net
= dev_net(skb
->dev
);
4718 int rc
= -EAFNOSUPPORT
;
4720 if (plen
< sizeof(*params
))
4723 if (flags
& ~(BPF_FIB_LOOKUP_DIRECT
| BPF_FIB_LOOKUP_OUTPUT
))
4726 switch (params
->family
) {
4727 #if IS_ENABLED(CONFIG_INET)
4729 rc
= bpf_ipv4_fib_lookup(net
, params
, flags
, false);
4732 #if IS_ENABLED(CONFIG_IPV6)
4734 rc
= bpf_ipv6_fib_lookup(net
, params
, flags
, false);
4740 struct net_device
*dev
;
4742 dev
= dev_get_by_index_rcu(net
, params
->ifindex
);
4743 if (!is_skb_forwardable(dev
, skb
))
4744 rc
= BPF_FIB_LKUP_RET_FRAG_NEEDED
;
4750 static const struct bpf_func_proto bpf_skb_fib_lookup_proto
= {
4751 .func
= bpf_skb_fib_lookup
,
4753 .ret_type
= RET_INTEGER
,
4754 .arg1_type
= ARG_PTR_TO_CTX
,
4755 .arg2_type
= ARG_PTR_TO_MEM
,
4756 .arg3_type
= ARG_CONST_SIZE
,
4757 .arg4_type
= ARG_ANYTHING
,
4760 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
4761 static int bpf_push_seg6_encap(struct sk_buff
*skb
, u32 type
, void *hdr
, u32 len
)
4764 struct ipv6_sr_hdr
*srh
= (struct ipv6_sr_hdr
*)hdr
;
4766 if (!seg6_validate_srh(srh
, len
))
4770 case BPF_LWT_ENCAP_SEG6_INLINE
:
4771 if (skb
->protocol
!= htons(ETH_P_IPV6
))
4774 err
= seg6_do_srh_inline(skb
, srh
);
4776 case BPF_LWT_ENCAP_SEG6
:
4777 skb_reset_inner_headers(skb
);
4778 skb
->encapsulation
= 1;
4779 err
= seg6_do_srh_encap(skb
, srh
, IPPROTO_IPV6
);
4785 bpf_compute_data_pointers(skb
);
4789 ipv6_hdr(skb
)->payload_len
= htons(skb
->len
- sizeof(struct ipv6hdr
));
4790 skb_set_transport_header(skb
, sizeof(struct ipv6hdr
));
4792 return seg6_lookup_nexthop(skb
, NULL
, 0);
4794 #endif /* CONFIG_IPV6_SEG6_BPF */
4796 BPF_CALL_4(bpf_lwt_push_encap
, struct sk_buff
*, skb
, u32
, type
, void *, hdr
,
4800 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
4801 case BPF_LWT_ENCAP_SEG6
:
4802 case BPF_LWT_ENCAP_SEG6_INLINE
:
4803 return bpf_push_seg6_encap(skb
, type
, hdr
, len
);
4810 static const struct bpf_func_proto bpf_lwt_push_encap_proto
= {
4811 .func
= bpf_lwt_push_encap
,
4813 .ret_type
= RET_INTEGER
,
4814 .arg1_type
= ARG_PTR_TO_CTX
,
4815 .arg2_type
= ARG_ANYTHING
,
4816 .arg3_type
= ARG_PTR_TO_MEM
,
4817 .arg4_type
= ARG_CONST_SIZE
4820 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
4821 BPF_CALL_4(bpf_lwt_seg6_store_bytes
, struct sk_buff
*, skb
, u32
, offset
,
4822 const void *, from
, u32
, len
)
4824 struct seg6_bpf_srh_state
*srh_state
=
4825 this_cpu_ptr(&seg6_bpf_srh_states
);
4826 struct ipv6_sr_hdr
*srh
= srh_state
->srh
;
4827 void *srh_tlvs
, *srh_end
, *ptr
;
4833 srh_tlvs
= (void *)((char *)srh
+ ((srh
->first_segment
+ 1) << 4));
4834 srh_end
= (void *)((char *)srh
+ sizeof(*srh
) + srh_state
->hdrlen
);
4836 ptr
= skb
->data
+ offset
;
4837 if (ptr
>= srh_tlvs
&& ptr
+ len
<= srh_end
)
4838 srh_state
->valid
= false;
4839 else if (ptr
< (void *)&srh
->flags
||
4840 ptr
+ len
> (void *)&srh
->segments
)
4843 if (unlikely(bpf_try_make_writable(skb
, offset
+ len
)))
4845 if (ipv6_find_hdr(skb
, &srhoff
, IPPROTO_ROUTING
, NULL
, NULL
) < 0)
4847 srh_state
->srh
= (struct ipv6_sr_hdr
*)(skb
->data
+ srhoff
);
4849 memcpy(skb
->data
+ offset
, from
, len
);
4853 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto
= {
4854 .func
= bpf_lwt_seg6_store_bytes
,
4856 .ret_type
= RET_INTEGER
,
4857 .arg1_type
= ARG_PTR_TO_CTX
,
4858 .arg2_type
= ARG_ANYTHING
,
4859 .arg3_type
= ARG_PTR_TO_MEM
,
4860 .arg4_type
= ARG_CONST_SIZE
4863 static void bpf_update_srh_state(struct sk_buff
*skb
)
4865 struct seg6_bpf_srh_state
*srh_state
=
4866 this_cpu_ptr(&seg6_bpf_srh_states
);
4869 if (ipv6_find_hdr(skb
, &srhoff
, IPPROTO_ROUTING
, NULL
, NULL
) < 0) {
4870 srh_state
->srh
= NULL
;
4872 srh_state
->srh
= (struct ipv6_sr_hdr
*)(skb
->data
+ srhoff
);
4873 srh_state
->hdrlen
= srh_state
->srh
->hdrlen
<< 3;
4874 srh_state
->valid
= true;
4878 BPF_CALL_4(bpf_lwt_seg6_action
, struct sk_buff
*, skb
,
4879 u32
, action
, void *, param
, u32
, param_len
)
4881 struct seg6_bpf_srh_state
*srh_state
=
4882 this_cpu_ptr(&seg6_bpf_srh_states
);
4887 case SEG6_LOCAL_ACTION_END_X
:
4888 if (!seg6_bpf_has_valid_srh(skb
))
4890 if (param_len
!= sizeof(struct in6_addr
))
4892 return seg6_lookup_nexthop(skb
, (struct in6_addr
*)param
, 0);
4893 case SEG6_LOCAL_ACTION_END_T
:
4894 if (!seg6_bpf_has_valid_srh(skb
))
4896 if (param_len
!= sizeof(int))
4898 return seg6_lookup_nexthop(skb
, NULL
, *(int *)param
);
4899 case SEG6_LOCAL_ACTION_END_DT6
:
4900 if (!seg6_bpf_has_valid_srh(skb
))
4902 if (param_len
!= sizeof(int))
4905 if (ipv6_find_hdr(skb
, &hdroff
, IPPROTO_IPV6
, NULL
, NULL
) < 0)
4907 if (!pskb_pull(skb
, hdroff
))
4910 skb_postpull_rcsum(skb
, skb_network_header(skb
), hdroff
);
4911 skb_reset_network_header(skb
);
4912 skb_reset_transport_header(skb
);
4913 skb
->encapsulation
= 0;
4915 bpf_compute_data_pointers(skb
);
4916 bpf_update_srh_state(skb
);
4917 return seg6_lookup_nexthop(skb
, NULL
, *(int *)param
);
4918 case SEG6_LOCAL_ACTION_END_B6
:
4919 if (srh_state
->srh
&& !seg6_bpf_has_valid_srh(skb
))
4921 err
= bpf_push_seg6_encap(skb
, BPF_LWT_ENCAP_SEG6_INLINE
,
4924 bpf_update_srh_state(skb
);
4927 case SEG6_LOCAL_ACTION_END_B6_ENCAP
:
4928 if (srh_state
->srh
&& !seg6_bpf_has_valid_srh(skb
))
4930 err
= bpf_push_seg6_encap(skb
, BPF_LWT_ENCAP_SEG6
,
4933 bpf_update_srh_state(skb
);
4941 static const struct bpf_func_proto bpf_lwt_seg6_action_proto
= {
4942 .func
= bpf_lwt_seg6_action
,
4944 .ret_type
= RET_INTEGER
,
4945 .arg1_type
= ARG_PTR_TO_CTX
,
4946 .arg2_type
= ARG_ANYTHING
,
4947 .arg3_type
= ARG_PTR_TO_MEM
,
4948 .arg4_type
= ARG_CONST_SIZE
4951 BPF_CALL_3(bpf_lwt_seg6_adjust_srh
, struct sk_buff
*, skb
, u32
, offset
,
4954 struct seg6_bpf_srh_state
*srh_state
=
4955 this_cpu_ptr(&seg6_bpf_srh_states
);
4956 struct ipv6_sr_hdr
*srh
= srh_state
->srh
;
4957 void *srh_end
, *srh_tlvs
, *ptr
;
4958 struct ipv6hdr
*hdr
;
4962 if (unlikely(srh
== NULL
))
4965 srh_tlvs
= (void *)((unsigned char *)srh
+ sizeof(*srh
) +
4966 ((srh
->first_segment
+ 1) << 4));
4967 srh_end
= (void *)((unsigned char *)srh
+ sizeof(*srh
) +
4969 ptr
= skb
->data
+ offset
;
4971 if (unlikely(ptr
< srh_tlvs
|| ptr
> srh_end
))
4973 if (unlikely(len
< 0 && (void *)((char *)ptr
- len
) > srh_end
))
4977 ret
= skb_cow_head(skb
, len
);
4978 if (unlikely(ret
< 0))
4981 ret
= bpf_skb_net_hdr_push(skb
, offset
, len
);
4983 ret
= bpf_skb_net_hdr_pop(skb
, offset
, -1 * len
);
4986 bpf_compute_data_pointers(skb
);
4987 if (unlikely(ret
< 0))
4990 hdr
= (struct ipv6hdr
*)skb
->data
;
4991 hdr
->payload_len
= htons(skb
->len
- sizeof(struct ipv6hdr
));
4993 if (ipv6_find_hdr(skb
, &srhoff
, IPPROTO_ROUTING
, NULL
, NULL
) < 0)
4995 srh_state
->srh
= (struct ipv6_sr_hdr
*)(skb
->data
+ srhoff
);
4996 srh_state
->hdrlen
+= len
;
4997 srh_state
->valid
= false;
5001 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto
= {
5002 .func
= bpf_lwt_seg6_adjust_srh
,
5004 .ret_type
= RET_INTEGER
,
5005 .arg1_type
= ARG_PTR_TO_CTX
,
5006 .arg2_type
= ARG_ANYTHING
,
5007 .arg3_type
= ARG_ANYTHING
,
5009 #endif /* CONFIG_IPV6_SEG6_BPF */
5012 static struct sock
*sk_lookup(struct net
*net
, struct bpf_sock_tuple
*tuple
,
5013 int dif
, int sdif
, u8 family
, u8 proto
)
5015 bool refcounted
= false;
5016 struct sock
*sk
= NULL
;
5018 if (family
== AF_INET
) {
5019 __be32 src4
= tuple
->ipv4
.saddr
;
5020 __be32 dst4
= tuple
->ipv4
.daddr
;
5022 if (proto
== IPPROTO_TCP
)
5023 sk
= __inet_lookup(net
, &tcp_hashinfo
, NULL
, 0,
5024 src4
, tuple
->ipv4
.sport
,
5025 dst4
, tuple
->ipv4
.dport
,
5026 dif
, sdif
, &refcounted
);
5028 sk
= __udp4_lib_lookup(net
, src4
, tuple
->ipv4
.sport
,
5029 dst4
, tuple
->ipv4
.dport
,
5030 dif
, sdif
, &udp_table
, NULL
);
5031 #if IS_ENABLED(CONFIG_IPV6)
5033 struct in6_addr
*src6
= (struct in6_addr
*)&tuple
->ipv6
.saddr
;
5034 struct in6_addr
*dst6
= (struct in6_addr
*)&tuple
->ipv6
.daddr
;
5036 if (proto
== IPPROTO_TCP
)
5037 sk
= __inet6_lookup(net
, &tcp_hashinfo
, NULL
, 0,
5038 src6
, tuple
->ipv6
.sport
,
5039 dst6
, ntohs(tuple
->ipv6
.dport
),
5040 dif
, sdif
, &refcounted
);
5041 else if (likely(ipv6_bpf_stub
))
5042 sk
= ipv6_bpf_stub
->udp6_lib_lookup(net
,
5043 src6
, tuple
->ipv6
.sport
,
5044 dst6
, tuple
->ipv6
.dport
,
5050 if (unlikely(sk
&& !refcounted
&& !sock_flag(sk
, SOCK_RCU_FREE
))) {
5051 WARN_ONCE(1, "Found non-RCU, unreferenced socket!");
5057 /* bpf_sk_lookup performs the core lookup for different types of sockets,
5058 * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE.
5059 * Returns the socket as an 'unsigned long' to simplify the casting in the
5060 * callers to satisfy BPF_CALL declarations.
5062 static unsigned long
5063 __bpf_sk_lookup(struct sk_buff
*skb
, struct bpf_sock_tuple
*tuple
, u32 len
,
5064 struct net
*caller_net
, u32 ifindex
, u8 proto
, u64 netns_id
,
5067 struct sock
*sk
= NULL
;
5068 u8 family
= AF_UNSPEC
;
5072 family
= len
== sizeof(tuple
->ipv4
) ? AF_INET
: AF_INET6
;
5073 if (unlikely(family
== AF_UNSPEC
|| flags
||
5074 !((s32
)netns_id
< 0 || netns_id
<= S32_MAX
)))
5077 if (family
== AF_INET
)
5078 sdif
= inet_sdif(skb
);
5080 sdif
= inet6_sdif(skb
);
5082 if ((s32
)netns_id
< 0) {
5084 sk
= sk_lookup(net
, tuple
, ifindex
, sdif
, family
, proto
);
5086 net
= get_net_ns_by_id(caller_net
, netns_id
);
5089 sk
= sk_lookup(net
, tuple
, ifindex
, sdif
, family
, proto
);
5094 sk
= sk_to_full_sk(sk
);
5096 return (unsigned long) sk
;
5099 static unsigned long
5100 bpf_sk_lookup(struct sk_buff
*skb
, struct bpf_sock_tuple
*tuple
, u32 len
,
5101 u8 proto
, u64 netns_id
, u64 flags
)
5103 struct net
*caller_net
;
5107 caller_net
= dev_net(skb
->dev
);
5108 ifindex
= skb
->dev
->ifindex
;
5110 caller_net
= sock_net(skb
->sk
);
5114 return __bpf_sk_lookup(skb
, tuple
, len
, caller_net
, ifindex
,
5115 proto
, netns_id
, flags
);
5118 BPF_CALL_5(bpf_sk_lookup_tcp
, struct sk_buff
*, skb
,
5119 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
5121 return bpf_sk_lookup(skb
, tuple
, len
, IPPROTO_TCP
, netns_id
, flags
);
5124 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto
= {
5125 .func
= bpf_sk_lookup_tcp
,
5128 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
5129 .arg1_type
= ARG_PTR_TO_CTX
,
5130 .arg2_type
= ARG_PTR_TO_MEM
,
5131 .arg3_type
= ARG_CONST_SIZE
,
5132 .arg4_type
= ARG_ANYTHING
,
5133 .arg5_type
= ARG_ANYTHING
,
5136 BPF_CALL_5(bpf_sk_lookup_udp
, struct sk_buff
*, skb
,
5137 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
5139 return bpf_sk_lookup(skb
, tuple
, len
, IPPROTO_UDP
, netns_id
, flags
);
5142 static const struct bpf_func_proto bpf_sk_lookup_udp_proto
= {
5143 .func
= bpf_sk_lookup_udp
,
5146 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
5147 .arg1_type
= ARG_PTR_TO_CTX
,
5148 .arg2_type
= ARG_PTR_TO_MEM
,
5149 .arg3_type
= ARG_CONST_SIZE
,
5150 .arg4_type
= ARG_ANYTHING
,
5151 .arg5_type
= ARG_ANYTHING
,
5154 BPF_CALL_1(bpf_sk_release
, struct sock
*, sk
)
5156 if (!sock_flag(sk
, SOCK_RCU_FREE
))
5161 static const struct bpf_func_proto bpf_sk_release_proto
= {
5162 .func
= bpf_sk_release
,
5164 .ret_type
= RET_INTEGER
,
5165 .arg1_type
= ARG_PTR_TO_SOCKET
,
5168 BPF_CALL_5(bpf_xdp_sk_lookup_udp
, struct xdp_buff
*, ctx
,
5169 struct bpf_sock_tuple
*, tuple
, u32
, len
, u32
, netns_id
, u64
, flags
)
5171 struct net
*caller_net
= dev_net(ctx
->rxq
->dev
);
5172 int ifindex
= ctx
->rxq
->dev
->ifindex
;
5174 return __bpf_sk_lookup(NULL
, tuple
, len
, caller_net
, ifindex
,
5175 IPPROTO_UDP
, netns_id
, flags
);
5178 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto
= {
5179 .func
= bpf_xdp_sk_lookup_udp
,
5182 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
5183 .arg1_type
= ARG_PTR_TO_CTX
,
5184 .arg2_type
= ARG_PTR_TO_MEM
,
5185 .arg3_type
= ARG_CONST_SIZE
,
5186 .arg4_type
= ARG_ANYTHING
,
5187 .arg5_type
= ARG_ANYTHING
,
5190 BPF_CALL_5(bpf_xdp_sk_lookup_tcp
, struct xdp_buff
*, ctx
,
5191 struct bpf_sock_tuple
*, tuple
, u32
, len
, u32
, netns_id
, u64
, flags
)
5193 struct net
*caller_net
= dev_net(ctx
->rxq
->dev
);
5194 int ifindex
= ctx
->rxq
->dev
->ifindex
;
5196 return __bpf_sk_lookup(NULL
, tuple
, len
, caller_net
, ifindex
,
5197 IPPROTO_TCP
, netns_id
, flags
);
5200 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto
= {
5201 .func
= bpf_xdp_sk_lookup_tcp
,
5204 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
5205 .arg1_type
= ARG_PTR_TO_CTX
,
5206 .arg2_type
= ARG_PTR_TO_MEM
,
5207 .arg3_type
= ARG_CONST_SIZE
,
5208 .arg4_type
= ARG_ANYTHING
,
5209 .arg5_type
= ARG_ANYTHING
,
5212 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp
, struct bpf_sock_addr_kern
*, ctx
,
5213 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
5215 return __bpf_sk_lookup(NULL
, tuple
, len
, sock_net(ctx
->sk
), 0,
5216 IPPROTO_TCP
, netns_id
, flags
);
5219 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto
= {
5220 .func
= bpf_sock_addr_sk_lookup_tcp
,
5222 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
5223 .arg1_type
= ARG_PTR_TO_CTX
,
5224 .arg2_type
= ARG_PTR_TO_MEM
,
5225 .arg3_type
= ARG_CONST_SIZE
,
5226 .arg4_type
= ARG_ANYTHING
,
5227 .arg5_type
= ARG_ANYTHING
,
5230 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp
, struct bpf_sock_addr_kern
*, ctx
,
5231 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
5233 return __bpf_sk_lookup(NULL
, tuple
, len
, sock_net(ctx
->sk
), 0,
5234 IPPROTO_UDP
, netns_id
, flags
);
5237 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto
= {
5238 .func
= bpf_sock_addr_sk_lookup_udp
,
5240 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
5241 .arg1_type
= ARG_PTR_TO_CTX
,
5242 .arg2_type
= ARG_PTR_TO_MEM
,
5243 .arg3_type
= ARG_CONST_SIZE
,
5244 .arg4_type
= ARG_ANYTHING
,
5245 .arg5_type
= ARG_ANYTHING
,
5248 #endif /* CONFIG_INET */
5250 bool bpf_helper_changes_pkt_data(void *func
)
5252 if (func
== bpf_skb_vlan_push
||
5253 func
== bpf_skb_vlan_pop
||
5254 func
== bpf_skb_store_bytes
||
5255 func
== bpf_skb_change_proto
||
5256 func
== bpf_skb_change_head
||
5257 func
== sk_skb_change_head
||
5258 func
== bpf_skb_change_tail
||
5259 func
== sk_skb_change_tail
||
5260 func
== bpf_skb_adjust_room
||
5261 func
== bpf_skb_pull_data
||
5262 func
== sk_skb_pull_data
||
5263 func
== bpf_clone_redirect
||
5264 func
== bpf_l3_csum_replace
||
5265 func
== bpf_l4_csum_replace
||
5266 func
== bpf_xdp_adjust_head
||
5267 func
== bpf_xdp_adjust_meta
||
5268 func
== bpf_msg_pull_data
||
5269 func
== bpf_msg_push_data
||
5270 func
== bpf_msg_pop_data
||
5271 func
== bpf_xdp_adjust_tail
||
5272 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
5273 func
== bpf_lwt_seg6_store_bytes
||
5274 func
== bpf_lwt_seg6_adjust_srh
||
5275 func
== bpf_lwt_seg6_action
||
5277 func
== bpf_lwt_push_encap
)
5283 static const struct bpf_func_proto
*
5284 bpf_base_func_proto(enum bpf_func_id func_id
)
5287 case BPF_FUNC_map_lookup_elem
:
5288 return &bpf_map_lookup_elem_proto
;
5289 case BPF_FUNC_map_update_elem
:
5290 return &bpf_map_update_elem_proto
;
5291 case BPF_FUNC_map_delete_elem
:
5292 return &bpf_map_delete_elem_proto
;
5293 case BPF_FUNC_map_push_elem
:
5294 return &bpf_map_push_elem_proto
;
5295 case BPF_FUNC_map_pop_elem
:
5296 return &bpf_map_pop_elem_proto
;
5297 case BPF_FUNC_map_peek_elem
:
5298 return &bpf_map_peek_elem_proto
;
5299 case BPF_FUNC_get_prandom_u32
:
5300 return &bpf_get_prandom_u32_proto
;
5301 case BPF_FUNC_get_smp_processor_id
:
5302 return &bpf_get_raw_smp_processor_id_proto
;
5303 case BPF_FUNC_get_numa_node_id
:
5304 return &bpf_get_numa_node_id_proto
;
5305 case BPF_FUNC_tail_call
:
5306 return &bpf_tail_call_proto
;
5307 case BPF_FUNC_ktime_get_ns
:
5308 return &bpf_ktime_get_ns_proto
;
5309 case BPF_FUNC_trace_printk
:
5310 if (capable(CAP_SYS_ADMIN
))
5311 return bpf_get_trace_printk_proto();
5312 /* else: fall through */
5318 static const struct bpf_func_proto
*
5319 sock_filter_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
5322 /* inet and inet6 sockets are created in a process
5323 * context so there is always a valid uid/gid
5325 case BPF_FUNC_get_current_uid_gid
:
5326 return &bpf_get_current_uid_gid_proto
;
5327 case BPF_FUNC_get_local_storage
:
5328 return &bpf_get_local_storage_proto
;
5330 return bpf_base_func_proto(func_id
);
5334 static const struct bpf_func_proto
*
5335 sock_addr_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
5338 /* inet and inet6 sockets are created in a process
5339 * context so there is always a valid uid/gid
5341 case BPF_FUNC_get_current_uid_gid
:
5342 return &bpf_get_current_uid_gid_proto
;
5344 switch (prog
->expected_attach_type
) {
5345 case BPF_CGROUP_INET4_CONNECT
:
5346 case BPF_CGROUP_INET6_CONNECT
:
5347 return &bpf_bind_proto
;
5351 case BPF_FUNC_get_socket_cookie
:
5352 return &bpf_get_socket_cookie_sock_addr_proto
;
5353 case BPF_FUNC_get_local_storage
:
5354 return &bpf_get_local_storage_proto
;
5356 case BPF_FUNC_sk_lookup_tcp
:
5357 return &bpf_sock_addr_sk_lookup_tcp_proto
;
5358 case BPF_FUNC_sk_lookup_udp
:
5359 return &bpf_sock_addr_sk_lookup_udp_proto
;
5360 case BPF_FUNC_sk_release
:
5361 return &bpf_sk_release_proto
;
5362 #endif /* CONFIG_INET */
5364 return bpf_base_func_proto(func_id
);
5368 static const struct bpf_func_proto
*
5369 sk_filter_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
5372 case BPF_FUNC_skb_load_bytes
:
5373 return &bpf_skb_load_bytes_proto
;
5374 case BPF_FUNC_skb_load_bytes_relative
:
5375 return &bpf_skb_load_bytes_relative_proto
;
5376 case BPF_FUNC_get_socket_cookie
:
5377 return &bpf_get_socket_cookie_proto
;
5378 case BPF_FUNC_get_socket_uid
:
5379 return &bpf_get_socket_uid_proto
;
5381 return bpf_base_func_proto(func_id
);
5385 static const struct bpf_func_proto
*
5386 cg_skb_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
5389 case BPF_FUNC_get_local_storage
:
5390 return &bpf_get_local_storage_proto
;
5392 return sk_filter_func_proto(func_id
, prog
);
5396 static const struct bpf_func_proto
*
5397 tc_cls_act_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
5400 case BPF_FUNC_skb_store_bytes
:
5401 return &bpf_skb_store_bytes_proto
;
5402 case BPF_FUNC_skb_load_bytes
:
5403 return &bpf_skb_load_bytes_proto
;
5404 case BPF_FUNC_skb_load_bytes_relative
:
5405 return &bpf_skb_load_bytes_relative_proto
;
5406 case BPF_FUNC_skb_pull_data
:
5407 return &bpf_skb_pull_data_proto
;
5408 case BPF_FUNC_csum_diff
:
5409 return &bpf_csum_diff_proto
;
5410 case BPF_FUNC_csum_update
:
5411 return &bpf_csum_update_proto
;
5412 case BPF_FUNC_l3_csum_replace
:
5413 return &bpf_l3_csum_replace_proto
;
5414 case BPF_FUNC_l4_csum_replace
:
5415 return &bpf_l4_csum_replace_proto
;
5416 case BPF_FUNC_clone_redirect
:
5417 return &bpf_clone_redirect_proto
;
5418 case BPF_FUNC_get_cgroup_classid
:
5419 return &bpf_get_cgroup_classid_proto
;
5420 case BPF_FUNC_skb_vlan_push
:
5421 return &bpf_skb_vlan_push_proto
;
5422 case BPF_FUNC_skb_vlan_pop
:
5423 return &bpf_skb_vlan_pop_proto
;
5424 case BPF_FUNC_skb_change_proto
:
5425 return &bpf_skb_change_proto_proto
;
5426 case BPF_FUNC_skb_change_type
:
5427 return &bpf_skb_change_type_proto
;
5428 case BPF_FUNC_skb_adjust_room
:
5429 return &bpf_skb_adjust_room_proto
;
5430 case BPF_FUNC_skb_change_tail
:
5431 return &bpf_skb_change_tail_proto
;
5432 case BPF_FUNC_skb_get_tunnel_key
:
5433 return &bpf_skb_get_tunnel_key_proto
;
5434 case BPF_FUNC_skb_set_tunnel_key
:
5435 return bpf_get_skb_set_tunnel_proto(func_id
);
5436 case BPF_FUNC_skb_get_tunnel_opt
:
5437 return &bpf_skb_get_tunnel_opt_proto
;
5438 case BPF_FUNC_skb_set_tunnel_opt
:
5439 return bpf_get_skb_set_tunnel_proto(func_id
);
5440 case BPF_FUNC_redirect
:
5441 return &bpf_redirect_proto
;
5442 case BPF_FUNC_get_route_realm
:
5443 return &bpf_get_route_realm_proto
;
5444 case BPF_FUNC_get_hash_recalc
:
5445 return &bpf_get_hash_recalc_proto
;
5446 case BPF_FUNC_set_hash_invalid
:
5447 return &bpf_set_hash_invalid_proto
;
5448 case BPF_FUNC_set_hash
:
5449 return &bpf_set_hash_proto
;
5450 case BPF_FUNC_perf_event_output
:
5451 return &bpf_skb_event_output_proto
;
5452 case BPF_FUNC_get_smp_processor_id
:
5453 return &bpf_get_smp_processor_id_proto
;
5454 case BPF_FUNC_skb_under_cgroup
:
5455 return &bpf_skb_under_cgroup_proto
;
5456 case BPF_FUNC_get_socket_cookie
:
5457 return &bpf_get_socket_cookie_proto
;
5458 case BPF_FUNC_get_socket_uid
:
5459 return &bpf_get_socket_uid_proto
;
5460 case BPF_FUNC_fib_lookup
:
5461 return &bpf_skb_fib_lookup_proto
;
5463 case BPF_FUNC_skb_get_xfrm_state
:
5464 return &bpf_skb_get_xfrm_state_proto
;
5466 #ifdef CONFIG_SOCK_CGROUP_DATA
5467 case BPF_FUNC_skb_cgroup_id
:
5468 return &bpf_skb_cgroup_id_proto
;
5469 case BPF_FUNC_skb_ancestor_cgroup_id
:
5470 return &bpf_skb_ancestor_cgroup_id_proto
;
5473 case BPF_FUNC_sk_lookup_tcp
:
5474 return &bpf_sk_lookup_tcp_proto
;
5475 case BPF_FUNC_sk_lookup_udp
:
5476 return &bpf_sk_lookup_udp_proto
;
5477 case BPF_FUNC_sk_release
:
5478 return &bpf_sk_release_proto
;
5481 return bpf_base_func_proto(func_id
);
5485 static const struct bpf_func_proto
*
5486 xdp_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
5489 case BPF_FUNC_perf_event_output
:
5490 return &bpf_xdp_event_output_proto
;
5491 case BPF_FUNC_get_smp_processor_id
:
5492 return &bpf_get_smp_processor_id_proto
;
5493 case BPF_FUNC_csum_diff
:
5494 return &bpf_csum_diff_proto
;
5495 case BPF_FUNC_xdp_adjust_head
:
5496 return &bpf_xdp_adjust_head_proto
;
5497 case BPF_FUNC_xdp_adjust_meta
:
5498 return &bpf_xdp_adjust_meta_proto
;
5499 case BPF_FUNC_redirect
:
5500 return &bpf_xdp_redirect_proto
;
5501 case BPF_FUNC_redirect_map
:
5502 return &bpf_xdp_redirect_map_proto
;
5503 case BPF_FUNC_xdp_adjust_tail
:
5504 return &bpf_xdp_adjust_tail_proto
;
5505 case BPF_FUNC_fib_lookup
:
5506 return &bpf_xdp_fib_lookup_proto
;
5508 case BPF_FUNC_sk_lookup_udp
:
5509 return &bpf_xdp_sk_lookup_udp_proto
;
5510 case BPF_FUNC_sk_lookup_tcp
:
5511 return &bpf_xdp_sk_lookup_tcp_proto
;
5512 case BPF_FUNC_sk_release
:
5513 return &bpf_sk_release_proto
;
5516 return bpf_base_func_proto(func_id
);
5520 const struct bpf_func_proto bpf_sock_map_update_proto __weak
;
5521 const struct bpf_func_proto bpf_sock_hash_update_proto __weak
;
5523 static const struct bpf_func_proto
*
5524 sock_ops_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
5527 case BPF_FUNC_setsockopt
:
5528 return &bpf_setsockopt_proto
;
5529 case BPF_FUNC_getsockopt
:
5530 return &bpf_getsockopt_proto
;
5531 case BPF_FUNC_sock_ops_cb_flags_set
:
5532 return &bpf_sock_ops_cb_flags_set_proto
;
5533 case BPF_FUNC_sock_map_update
:
5534 return &bpf_sock_map_update_proto
;
5535 case BPF_FUNC_sock_hash_update
:
5536 return &bpf_sock_hash_update_proto
;
5537 case BPF_FUNC_get_socket_cookie
:
5538 return &bpf_get_socket_cookie_sock_ops_proto
;
5539 case BPF_FUNC_get_local_storage
:
5540 return &bpf_get_local_storage_proto
;
5541 case BPF_FUNC_perf_event_output
:
5542 return &bpf_sockopt_event_output_proto
;
5544 return bpf_base_func_proto(func_id
);
5548 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak
;
5549 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak
;
5551 static const struct bpf_func_proto
*
5552 sk_msg_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
5555 case BPF_FUNC_msg_redirect_map
:
5556 return &bpf_msg_redirect_map_proto
;
5557 case BPF_FUNC_msg_redirect_hash
:
5558 return &bpf_msg_redirect_hash_proto
;
5559 case BPF_FUNC_msg_apply_bytes
:
5560 return &bpf_msg_apply_bytes_proto
;
5561 case BPF_FUNC_msg_cork_bytes
:
5562 return &bpf_msg_cork_bytes_proto
;
5563 case BPF_FUNC_msg_pull_data
:
5564 return &bpf_msg_pull_data_proto
;
5565 case BPF_FUNC_msg_push_data
:
5566 return &bpf_msg_push_data_proto
;
5567 case BPF_FUNC_msg_pop_data
:
5568 return &bpf_msg_pop_data_proto
;
5570 return bpf_base_func_proto(func_id
);
5574 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak
;
5575 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak
;
5577 static const struct bpf_func_proto
*
5578 sk_skb_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
5581 case BPF_FUNC_skb_store_bytes
:
5582 return &bpf_skb_store_bytes_proto
;
5583 case BPF_FUNC_skb_load_bytes
:
5584 return &bpf_skb_load_bytes_proto
;
5585 case BPF_FUNC_skb_pull_data
:
5586 return &sk_skb_pull_data_proto
;
5587 case BPF_FUNC_skb_change_tail
:
5588 return &sk_skb_change_tail_proto
;
5589 case BPF_FUNC_skb_change_head
:
5590 return &sk_skb_change_head_proto
;
5591 case BPF_FUNC_get_socket_cookie
:
5592 return &bpf_get_socket_cookie_proto
;
5593 case BPF_FUNC_get_socket_uid
:
5594 return &bpf_get_socket_uid_proto
;
5595 case BPF_FUNC_sk_redirect_map
:
5596 return &bpf_sk_redirect_map_proto
;
5597 case BPF_FUNC_sk_redirect_hash
:
5598 return &bpf_sk_redirect_hash_proto
;
5600 case BPF_FUNC_sk_lookup_tcp
:
5601 return &bpf_sk_lookup_tcp_proto
;
5602 case BPF_FUNC_sk_lookup_udp
:
5603 return &bpf_sk_lookup_udp_proto
;
5604 case BPF_FUNC_sk_release
:
5605 return &bpf_sk_release_proto
;
5608 return bpf_base_func_proto(func_id
);
5612 static const struct bpf_func_proto
*
5613 flow_dissector_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
5616 case BPF_FUNC_skb_load_bytes
:
5617 return &bpf_skb_load_bytes_proto
;
5619 return bpf_base_func_proto(func_id
);
5623 static const struct bpf_func_proto
*
5624 lwt_out_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
5627 case BPF_FUNC_skb_load_bytes
:
5628 return &bpf_skb_load_bytes_proto
;
5629 case BPF_FUNC_skb_pull_data
:
5630 return &bpf_skb_pull_data_proto
;
5631 case BPF_FUNC_csum_diff
:
5632 return &bpf_csum_diff_proto
;
5633 case BPF_FUNC_get_cgroup_classid
:
5634 return &bpf_get_cgroup_classid_proto
;
5635 case BPF_FUNC_get_route_realm
:
5636 return &bpf_get_route_realm_proto
;
5637 case BPF_FUNC_get_hash_recalc
:
5638 return &bpf_get_hash_recalc_proto
;
5639 case BPF_FUNC_perf_event_output
:
5640 return &bpf_skb_event_output_proto
;
5641 case BPF_FUNC_get_smp_processor_id
:
5642 return &bpf_get_smp_processor_id_proto
;
5643 case BPF_FUNC_skb_under_cgroup
:
5644 return &bpf_skb_under_cgroup_proto
;
5646 return bpf_base_func_proto(func_id
);
5650 static const struct bpf_func_proto
*
5651 lwt_in_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
5654 case BPF_FUNC_lwt_push_encap
:
5655 return &bpf_lwt_push_encap_proto
;
5657 return lwt_out_func_proto(func_id
, prog
);
5661 static const struct bpf_func_proto
*
5662 lwt_xmit_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
5665 case BPF_FUNC_skb_get_tunnel_key
:
5666 return &bpf_skb_get_tunnel_key_proto
;
5667 case BPF_FUNC_skb_set_tunnel_key
:
5668 return bpf_get_skb_set_tunnel_proto(func_id
);
5669 case BPF_FUNC_skb_get_tunnel_opt
:
5670 return &bpf_skb_get_tunnel_opt_proto
;
5671 case BPF_FUNC_skb_set_tunnel_opt
:
5672 return bpf_get_skb_set_tunnel_proto(func_id
);
5673 case BPF_FUNC_redirect
:
5674 return &bpf_redirect_proto
;
5675 case BPF_FUNC_clone_redirect
:
5676 return &bpf_clone_redirect_proto
;
5677 case BPF_FUNC_skb_change_tail
:
5678 return &bpf_skb_change_tail_proto
;
5679 case BPF_FUNC_skb_change_head
:
5680 return &bpf_skb_change_head_proto
;
5681 case BPF_FUNC_skb_store_bytes
:
5682 return &bpf_skb_store_bytes_proto
;
5683 case BPF_FUNC_csum_update
:
5684 return &bpf_csum_update_proto
;
5685 case BPF_FUNC_l3_csum_replace
:
5686 return &bpf_l3_csum_replace_proto
;
5687 case BPF_FUNC_l4_csum_replace
:
5688 return &bpf_l4_csum_replace_proto
;
5689 case BPF_FUNC_set_hash_invalid
:
5690 return &bpf_set_hash_invalid_proto
;
5692 return lwt_out_func_proto(func_id
, prog
);
5696 static const struct bpf_func_proto
*
5697 lwt_seg6local_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
5700 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
5701 case BPF_FUNC_lwt_seg6_store_bytes
:
5702 return &bpf_lwt_seg6_store_bytes_proto
;
5703 case BPF_FUNC_lwt_seg6_action
:
5704 return &bpf_lwt_seg6_action_proto
;
5705 case BPF_FUNC_lwt_seg6_adjust_srh
:
5706 return &bpf_lwt_seg6_adjust_srh_proto
;
5709 return lwt_out_func_proto(func_id
, prog
);
5713 static bool bpf_skb_is_valid_access(int off
, int size
, enum bpf_access_type type
,
5714 const struct bpf_prog
*prog
,
5715 struct bpf_insn_access_aux
*info
)
5717 const int size_default
= sizeof(__u32
);
5719 if (off
< 0 || off
>= sizeof(struct __sk_buff
))
5722 /* The verifier guarantees that size > 0. */
5723 if (off
% size
!= 0)
5727 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
5728 if (off
+ size
> offsetofend(struct __sk_buff
, cb
[4]))
5731 case bpf_ctx_range_till(struct __sk_buff
, remote_ip6
[0], remote_ip6
[3]):
5732 case bpf_ctx_range_till(struct __sk_buff
, local_ip6
[0], local_ip6
[3]):
5733 case bpf_ctx_range_till(struct __sk_buff
, remote_ip4
, remote_ip4
):
5734 case bpf_ctx_range_till(struct __sk_buff
, local_ip4
, local_ip4
):
5735 case bpf_ctx_range(struct __sk_buff
, data
):
5736 case bpf_ctx_range(struct __sk_buff
, data_meta
):
5737 case bpf_ctx_range(struct __sk_buff
, data_end
):
5738 if (size
!= size_default
)
5741 case bpf_ctx_range_ptr(struct __sk_buff
, flow_keys
):
5742 if (size
!= sizeof(__u64
))
5745 case bpf_ctx_range(struct __sk_buff
, tstamp
):
5746 if (size
!= sizeof(__u64
))
5750 /* Only narrow read access allowed for now. */
5751 if (type
== BPF_WRITE
) {
5752 if (size
!= size_default
)
5755 bpf_ctx_record_field_size(info
, size_default
);
5756 if (!bpf_ctx_narrow_access_ok(off
, size
, size_default
))
5764 static bool sk_filter_is_valid_access(int off
, int size
,
5765 enum bpf_access_type type
,
5766 const struct bpf_prog
*prog
,
5767 struct bpf_insn_access_aux
*info
)
5770 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
5771 case bpf_ctx_range(struct __sk_buff
, data
):
5772 case bpf_ctx_range(struct __sk_buff
, data_meta
):
5773 case bpf_ctx_range(struct __sk_buff
, data_end
):
5774 case bpf_ctx_range_ptr(struct __sk_buff
, flow_keys
):
5775 case bpf_ctx_range_till(struct __sk_buff
, family
, local_port
):
5776 case bpf_ctx_range(struct __sk_buff
, tstamp
):
5777 case bpf_ctx_range(struct __sk_buff
, wire_len
):
5781 if (type
== BPF_WRITE
) {
5783 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
5790 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
5793 static bool cg_skb_is_valid_access(int off
, int size
,
5794 enum bpf_access_type type
,
5795 const struct bpf_prog
*prog
,
5796 struct bpf_insn_access_aux
*info
)
5799 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
5800 case bpf_ctx_range(struct __sk_buff
, data_meta
):
5801 case bpf_ctx_range_ptr(struct __sk_buff
, flow_keys
):
5802 case bpf_ctx_range(struct __sk_buff
, wire_len
):
5804 case bpf_ctx_range(struct __sk_buff
, data
):
5805 case bpf_ctx_range(struct __sk_buff
, data_end
):
5806 if (!capable(CAP_SYS_ADMIN
))
5811 if (type
== BPF_WRITE
) {
5813 case bpf_ctx_range(struct __sk_buff
, mark
):
5814 case bpf_ctx_range(struct __sk_buff
, priority
):
5815 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
5817 case bpf_ctx_range(struct __sk_buff
, tstamp
):
5818 if (!capable(CAP_SYS_ADMIN
))
5827 case bpf_ctx_range(struct __sk_buff
, data
):
5828 info
->reg_type
= PTR_TO_PACKET
;
5830 case bpf_ctx_range(struct __sk_buff
, data_end
):
5831 info
->reg_type
= PTR_TO_PACKET_END
;
5835 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
5838 static bool lwt_is_valid_access(int off
, int size
,
5839 enum bpf_access_type type
,
5840 const struct bpf_prog
*prog
,
5841 struct bpf_insn_access_aux
*info
)
5844 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
5845 case bpf_ctx_range_till(struct __sk_buff
, family
, local_port
):
5846 case bpf_ctx_range(struct __sk_buff
, data_meta
):
5847 case bpf_ctx_range_ptr(struct __sk_buff
, flow_keys
):
5848 case bpf_ctx_range(struct __sk_buff
, tstamp
):
5849 case bpf_ctx_range(struct __sk_buff
, wire_len
):
5853 if (type
== BPF_WRITE
) {
5855 case bpf_ctx_range(struct __sk_buff
, mark
):
5856 case bpf_ctx_range(struct __sk_buff
, priority
):
5857 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
5865 case bpf_ctx_range(struct __sk_buff
, data
):
5866 info
->reg_type
= PTR_TO_PACKET
;
5868 case bpf_ctx_range(struct __sk_buff
, data_end
):
5869 info
->reg_type
= PTR_TO_PACKET_END
;
5873 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
5876 /* Attach type specific accesses */
5877 static bool __sock_filter_check_attach_type(int off
,
5878 enum bpf_access_type access_type
,
5879 enum bpf_attach_type attach_type
)
5882 case offsetof(struct bpf_sock
, bound_dev_if
):
5883 case offsetof(struct bpf_sock
, mark
):
5884 case offsetof(struct bpf_sock
, priority
):
5885 switch (attach_type
) {
5886 case BPF_CGROUP_INET_SOCK_CREATE
:
5891 case bpf_ctx_range(struct bpf_sock
, src_ip4
):
5892 switch (attach_type
) {
5893 case BPF_CGROUP_INET4_POST_BIND
:
5898 case bpf_ctx_range_till(struct bpf_sock
, src_ip6
[0], src_ip6
[3]):
5899 switch (attach_type
) {
5900 case BPF_CGROUP_INET6_POST_BIND
:
5905 case bpf_ctx_range(struct bpf_sock
, src_port
):
5906 switch (attach_type
) {
5907 case BPF_CGROUP_INET4_POST_BIND
:
5908 case BPF_CGROUP_INET6_POST_BIND
:
5915 return access_type
== BPF_READ
;
5920 static bool __sock_filter_check_size(int off
, int size
,
5921 struct bpf_insn_access_aux
*info
)
5923 const int size_default
= sizeof(__u32
);
5926 case bpf_ctx_range(struct bpf_sock
, src_ip4
):
5927 case bpf_ctx_range_till(struct bpf_sock
, src_ip6
[0], src_ip6
[3]):
5928 bpf_ctx_record_field_size(info
, size_default
);
5929 return bpf_ctx_narrow_access_ok(off
, size
, size_default
);
5932 return size
== size_default
;
5935 bool bpf_sock_is_valid_access(int off
, int size
, enum bpf_access_type type
,
5936 struct bpf_insn_access_aux
*info
)
5938 if (off
< 0 || off
>= sizeof(struct bpf_sock
))
5940 if (off
% size
!= 0)
5942 if (!__sock_filter_check_size(off
, size
, info
))
5947 static bool sock_filter_is_valid_access(int off
, int size
,
5948 enum bpf_access_type type
,
5949 const struct bpf_prog
*prog
,
5950 struct bpf_insn_access_aux
*info
)
5952 if (!bpf_sock_is_valid_access(off
, size
, type
, info
))
5954 return __sock_filter_check_attach_type(off
, type
,
5955 prog
->expected_attach_type
);
5958 static int bpf_noop_prologue(struct bpf_insn
*insn_buf
, bool direct_write
,
5959 const struct bpf_prog
*prog
)
5961 /* Neither direct read nor direct write requires any preliminary
5967 static int bpf_unclone_prologue(struct bpf_insn
*insn_buf
, bool direct_write
,
5968 const struct bpf_prog
*prog
, int drop_verdict
)
5970 struct bpf_insn
*insn
= insn_buf
;
5975 /* if (!skb->cloned)
5978 * (Fast-path, otherwise approximation that we might be
5979 * a clone, do the rest in helper.)
5981 *insn
++ = BPF_LDX_MEM(BPF_B
, BPF_REG_6
, BPF_REG_1
, CLONED_OFFSET());
5982 *insn
++ = BPF_ALU32_IMM(BPF_AND
, BPF_REG_6
, CLONED_MASK
);
5983 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, BPF_REG_6
, 0, 7);
5985 /* ret = bpf_skb_pull_data(skb, 0); */
5986 *insn
++ = BPF_MOV64_REG(BPF_REG_6
, BPF_REG_1
);
5987 *insn
++ = BPF_ALU64_REG(BPF_XOR
, BPF_REG_2
, BPF_REG_2
);
5988 *insn
++ = BPF_RAW_INSN(BPF_JMP
| BPF_CALL
, 0, 0, 0,
5989 BPF_FUNC_skb_pull_data
);
5992 * return TC_ACT_SHOT;
5994 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, BPF_REG_0
, 0, 2);
5995 *insn
++ = BPF_ALU32_IMM(BPF_MOV
, BPF_REG_0
, drop_verdict
);
5996 *insn
++ = BPF_EXIT_INSN();
5999 *insn
++ = BPF_MOV64_REG(BPF_REG_1
, BPF_REG_6
);
6001 *insn
++ = prog
->insnsi
[0];
6003 return insn
- insn_buf
;
6006 static int bpf_gen_ld_abs(const struct bpf_insn
*orig
,
6007 struct bpf_insn
*insn_buf
)
6009 bool indirect
= BPF_MODE(orig
->code
) == BPF_IND
;
6010 struct bpf_insn
*insn
= insn_buf
;
6012 /* We're guaranteed here that CTX is in R6. */
6013 *insn
++ = BPF_MOV64_REG(BPF_REG_1
, BPF_REG_CTX
);
6015 *insn
++ = BPF_MOV64_IMM(BPF_REG_2
, orig
->imm
);
6017 *insn
++ = BPF_MOV64_REG(BPF_REG_2
, orig
->src_reg
);
6019 *insn
++ = BPF_ALU64_IMM(BPF_ADD
, BPF_REG_2
, orig
->imm
);
6022 switch (BPF_SIZE(orig
->code
)) {
6024 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache
);
6027 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache
);
6030 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache
);
6034 *insn
++ = BPF_JMP_IMM(BPF_JSGE
, BPF_REG_0
, 0, 2);
6035 *insn
++ = BPF_ALU32_REG(BPF_XOR
, BPF_REG_0
, BPF_REG_0
);
6036 *insn
++ = BPF_EXIT_INSN();
6038 return insn
- insn_buf
;
6041 static int tc_cls_act_prologue(struct bpf_insn
*insn_buf
, bool direct_write
,
6042 const struct bpf_prog
*prog
)
6044 return bpf_unclone_prologue(insn_buf
, direct_write
, prog
, TC_ACT_SHOT
);
6047 static bool tc_cls_act_is_valid_access(int off
, int size
,
6048 enum bpf_access_type type
,
6049 const struct bpf_prog
*prog
,
6050 struct bpf_insn_access_aux
*info
)
6052 if (type
== BPF_WRITE
) {
6054 case bpf_ctx_range(struct __sk_buff
, mark
):
6055 case bpf_ctx_range(struct __sk_buff
, tc_index
):
6056 case bpf_ctx_range(struct __sk_buff
, priority
):
6057 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
6058 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
6059 case bpf_ctx_range(struct __sk_buff
, tstamp
):
6067 case bpf_ctx_range(struct __sk_buff
, data
):
6068 info
->reg_type
= PTR_TO_PACKET
;
6070 case bpf_ctx_range(struct __sk_buff
, data_meta
):
6071 info
->reg_type
= PTR_TO_PACKET_META
;
6073 case bpf_ctx_range(struct __sk_buff
, data_end
):
6074 info
->reg_type
= PTR_TO_PACKET_END
;
6076 case bpf_ctx_range_ptr(struct __sk_buff
, flow_keys
):
6077 case bpf_ctx_range_till(struct __sk_buff
, family
, local_port
):
6081 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
6084 static bool __is_valid_xdp_access(int off
, int size
)
6086 if (off
< 0 || off
>= sizeof(struct xdp_md
))
6088 if (off
% size
!= 0)
6090 if (size
!= sizeof(__u32
))
6096 static bool xdp_is_valid_access(int off
, int size
,
6097 enum bpf_access_type type
,
6098 const struct bpf_prog
*prog
,
6099 struct bpf_insn_access_aux
*info
)
6101 if (type
== BPF_WRITE
) {
6102 if (bpf_prog_is_dev_bound(prog
->aux
)) {
6104 case offsetof(struct xdp_md
, rx_queue_index
):
6105 return __is_valid_xdp_access(off
, size
);
6112 case offsetof(struct xdp_md
, data
):
6113 info
->reg_type
= PTR_TO_PACKET
;
6115 case offsetof(struct xdp_md
, data_meta
):
6116 info
->reg_type
= PTR_TO_PACKET_META
;
6118 case offsetof(struct xdp_md
, data_end
):
6119 info
->reg_type
= PTR_TO_PACKET_END
;
6123 return __is_valid_xdp_access(off
, size
);
6126 void bpf_warn_invalid_xdp_action(u32 act
)
6128 const u32 act_max
= XDP_REDIRECT
;
6130 WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n",
6131 act
> act_max
? "Illegal" : "Driver unsupported",
6134 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action
);
6136 static bool sock_addr_is_valid_access(int off
, int size
,
6137 enum bpf_access_type type
,
6138 const struct bpf_prog
*prog
,
6139 struct bpf_insn_access_aux
*info
)
6141 const int size_default
= sizeof(__u32
);
6143 if (off
< 0 || off
>= sizeof(struct bpf_sock_addr
))
6145 if (off
% size
!= 0)
6148 /* Disallow access to IPv6 fields from IPv4 contex and vise
6152 case bpf_ctx_range(struct bpf_sock_addr
, user_ip4
):
6153 switch (prog
->expected_attach_type
) {
6154 case BPF_CGROUP_INET4_BIND
:
6155 case BPF_CGROUP_INET4_CONNECT
:
6156 case BPF_CGROUP_UDP4_SENDMSG
:
6162 case bpf_ctx_range_till(struct bpf_sock_addr
, user_ip6
[0], user_ip6
[3]):
6163 switch (prog
->expected_attach_type
) {
6164 case BPF_CGROUP_INET6_BIND
:
6165 case BPF_CGROUP_INET6_CONNECT
:
6166 case BPF_CGROUP_UDP6_SENDMSG
:
6172 case bpf_ctx_range(struct bpf_sock_addr
, msg_src_ip4
):
6173 switch (prog
->expected_attach_type
) {
6174 case BPF_CGROUP_UDP4_SENDMSG
:
6180 case bpf_ctx_range_till(struct bpf_sock_addr
, msg_src_ip6
[0],
6182 switch (prog
->expected_attach_type
) {
6183 case BPF_CGROUP_UDP6_SENDMSG
:
6192 case bpf_ctx_range(struct bpf_sock_addr
, user_ip4
):
6193 case bpf_ctx_range_till(struct bpf_sock_addr
, user_ip6
[0], user_ip6
[3]):
6194 case bpf_ctx_range(struct bpf_sock_addr
, msg_src_ip4
):
6195 case bpf_ctx_range_till(struct bpf_sock_addr
, msg_src_ip6
[0],
6197 /* Only narrow read access allowed for now. */
6198 if (type
== BPF_READ
) {
6199 bpf_ctx_record_field_size(info
, size_default
);
6200 if (!bpf_ctx_narrow_access_ok(off
, size
, size_default
))
6203 if (size
!= size_default
)
6207 case bpf_ctx_range(struct bpf_sock_addr
, user_port
):
6208 if (size
!= size_default
)
6212 if (type
== BPF_READ
) {
6213 if (size
!= size_default
)
6223 static bool sock_ops_is_valid_access(int off
, int size
,
6224 enum bpf_access_type type
,
6225 const struct bpf_prog
*prog
,
6226 struct bpf_insn_access_aux
*info
)
6228 const int size_default
= sizeof(__u32
);
6230 if (off
< 0 || off
>= sizeof(struct bpf_sock_ops
))
6233 /* The verifier guarantees that size > 0. */
6234 if (off
% size
!= 0)
6237 if (type
== BPF_WRITE
) {
6239 case offsetof(struct bpf_sock_ops
, reply
):
6240 case offsetof(struct bpf_sock_ops
, sk_txhash
):
6241 if (size
!= size_default
)
6249 case bpf_ctx_range_till(struct bpf_sock_ops
, bytes_received
,
6251 if (size
!= sizeof(__u64
))
6255 if (size
!= size_default
)
6264 static int sk_skb_prologue(struct bpf_insn
*insn_buf
, bool direct_write
,
6265 const struct bpf_prog
*prog
)
6267 return bpf_unclone_prologue(insn_buf
, direct_write
, prog
, SK_DROP
);
6270 static bool sk_skb_is_valid_access(int off
, int size
,
6271 enum bpf_access_type type
,
6272 const struct bpf_prog
*prog
,
6273 struct bpf_insn_access_aux
*info
)
6276 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
6277 case bpf_ctx_range(struct __sk_buff
, data_meta
):
6278 case bpf_ctx_range_ptr(struct __sk_buff
, flow_keys
):
6279 case bpf_ctx_range(struct __sk_buff
, tstamp
):
6280 case bpf_ctx_range(struct __sk_buff
, wire_len
):
6284 if (type
== BPF_WRITE
) {
6286 case bpf_ctx_range(struct __sk_buff
, tc_index
):
6287 case bpf_ctx_range(struct __sk_buff
, priority
):
6295 case bpf_ctx_range(struct __sk_buff
, mark
):
6297 case bpf_ctx_range(struct __sk_buff
, data
):
6298 info
->reg_type
= PTR_TO_PACKET
;
6300 case bpf_ctx_range(struct __sk_buff
, data_end
):
6301 info
->reg_type
= PTR_TO_PACKET_END
;
6305 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
6308 static bool sk_msg_is_valid_access(int off
, int size
,
6309 enum bpf_access_type type
,
6310 const struct bpf_prog
*prog
,
6311 struct bpf_insn_access_aux
*info
)
6313 if (type
== BPF_WRITE
)
6316 if (off
% size
!= 0)
6320 case offsetof(struct sk_msg_md
, data
):
6321 info
->reg_type
= PTR_TO_PACKET
;
6322 if (size
!= sizeof(__u64
))
6325 case offsetof(struct sk_msg_md
, data_end
):
6326 info
->reg_type
= PTR_TO_PACKET_END
;
6327 if (size
!= sizeof(__u64
))
6330 case bpf_ctx_range(struct sk_msg_md
, family
):
6331 case bpf_ctx_range(struct sk_msg_md
, remote_ip4
):
6332 case bpf_ctx_range(struct sk_msg_md
, local_ip4
):
6333 case bpf_ctx_range_till(struct sk_msg_md
, remote_ip6
[0], remote_ip6
[3]):
6334 case bpf_ctx_range_till(struct sk_msg_md
, local_ip6
[0], local_ip6
[3]):
6335 case bpf_ctx_range(struct sk_msg_md
, remote_port
):
6336 case bpf_ctx_range(struct sk_msg_md
, local_port
):
6337 case bpf_ctx_range(struct sk_msg_md
, size
):
6338 if (size
!= sizeof(__u32
))
6347 static bool flow_dissector_is_valid_access(int off
, int size
,
6348 enum bpf_access_type type
,
6349 const struct bpf_prog
*prog
,
6350 struct bpf_insn_access_aux
*info
)
6352 if (type
== BPF_WRITE
) {
6354 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
6362 case bpf_ctx_range(struct __sk_buff
, data
):
6363 info
->reg_type
= PTR_TO_PACKET
;
6365 case bpf_ctx_range(struct __sk_buff
, data_end
):
6366 info
->reg_type
= PTR_TO_PACKET_END
;
6368 case bpf_ctx_range_ptr(struct __sk_buff
, flow_keys
):
6369 info
->reg_type
= PTR_TO_FLOW_KEYS
;
6371 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
6372 case bpf_ctx_range(struct __sk_buff
, data_meta
):
6373 case bpf_ctx_range_till(struct __sk_buff
, family
, local_port
):
6374 case bpf_ctx_range(struct __sk_buff
, tstamp
):
6375 case bpf_ctx_range(struct __sk_buff
, wire_len
):
6379 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
6382 static u32
bpf_convert_ctx_access(enum bpf_access_type type
,
6383 const struct bpf_insn
*si
,
6384 struct bpf_insn
*insn_buf
,
6385 struct bpf_prog
*prog
, u32
*target_size
)
6387 struct bpf_insn
*insn
= insn_buf
;
6391 case offsetof(struct __sk_buff
, len
):
6392 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6393 bpf_target_off(struct sk_buff
, len
, 4,
6397 case offsetof(struct __sk_buff
, protocol
):
6398 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
6399 bpf_target_off(struct sk_buff
, protocol
, 2,
6403 case offsetof(struct __sk_buff
, vlan_proto
):
6404 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
6405 bpf_target_off(struct sk_buff
, vlan_proto
, 2,
6409 case offsetof(struct __sk_buff
, priority
):
6410 if (type
== BPF_WRITE
)
6411 *insn
++ = BPF_STX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6412 bpf_target_off(struct sk_buff
, priority
, 4,
6415 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6416 bpf_target_off(struct sk_buff
, priority
, 4,
6420 case offsetof(struct __sk_buff
, ingress_ifindex
):
6421 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6422 bpf_target_off(struct sk_buff
, skb_iif
, 4,
6426 case offsetof(struct __sk_buff
, ifindex
):
6427 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, dev
),
6428 si
->dst_reg
, si
->src_reg
,
6429 offsetof(struct sk_buff
, dev
));
6430 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, si
->dst_reg
, 0, 1);
6431 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
6432 bpf_target_off(struct net_device
, ifindex
, 4,
6436 case offsetof(struct __sk_buff
, hash
):
6437 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6438 bpf_target_off(struct sk_buff
, hash
, 4,
6442 case offsetof(struct __sk_buff
, mark
):
6443 if (type
== BPF_WRITE
)
6444 *insn
++ = BPF_STX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6445 bpf_target_off(struct sk_buff
, mark
, 4,
6448 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6449 bpf_target_off(struct sk_buff
, mark
, 4,
6453 case offsetof(struct __sk_buff
, pkt_type
):
6455 *insn
++ = BPF_LDX_MEM(BPF_B
, si
->dst_reg
, si
->src_reg
,
6457 *insn
++ = BPF_ALU32_IMM(BPF_AND
, si
->dst_reg
, PKT_TYPE_MAX
);
6458 #ifdef __BIG_ENDIAN_BITFIELD
6459 *insn
++ = BPF_ALU32_IMM(BPF_RSH
, si
->dst_reg
, 5);
6463 case offsetof(struct __sk_buff
, queue_mapping
):
6464 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
6465 bpf_target_off(struct sk_buff
, queue_mapping
, 2,
6469 case offsetof(struct __sk_buff
, vlan_present
):
6471 *insn
++ = BPF_LDX_MEM(BPF_B
, si
->dst_reg
, si
->src_reg
,
6472 PKT_VLAN_PRESENT_OFFSET());
6473 if (PKT_VLAN_PRESENT_BIT
)
6474 *insn
++ = BPF_ALU32_IMM(BPF_RSH
, si
->dst_reg
, PKT_VLAN_PRESENT_BIT
);
6475 if (PKT_VLAN_PRESENT_BIT
< 7)
6476 *insn
++ = BPF_ALU32_IMM(BPF_AND
, si
->dst_reg
, 1);
6479 case offsetof(struct __sk_buff
, vlan_tci
):
6480 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
6481 bpf_target_off(struct sk_buff
, vlan_tci
, 2,
6485 case offsetof(struct __sk_buff
, cb
[0]) ...
6486 offsetofend(struct __sk_buff
, cb
[4]) - 1:
6487 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb
, data
) < 20);
6488 BUILD_BUG_ON((offsetof(struct sk_buff
, cb
) +
6489 offsetof(struct qdisc_skb_cb
, data
)) %
6492 prog
->cb_access
= 1;
6494 off
-= offsetof(struct __sk_buff
, cb
[0]);
6495 off
+= offsetof(struct sk_buff
, cb
);
6496 off
+= offsetof(struct qdisc_skb_cb
, data
);
6497 if (type
== BPF_WRITE
)
6498 *insn
++ = BPF_STX_MEM(BPF_SIZE(si
->code
), si
->dst_reg
,
6501 *insn
++ = BPF_LDX_MEM(BPF_SIZE(si
->code
), si
->dst_reg
,
6505 case offsetof(struct __sk_buff
, tc_classid
):
6506 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb
, tc_classid
) != 2);
6509 off
-= offsetof(struct __sk_buff
, tc_classid
);
6510 off
+= offsetof(struct sk_buff
, cb
);
6511 off
+= offsetof(struct qdisc_skb_cb
, tc_classid
);
6513 if (type
== BPF_WRITE
)
6514 *insn
++ = BPF_STX_MEM(BPF_H
, si
->dst_reg
,
6517 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
,
6521 case offsetof(struct __sk_buff
, data
):
6522 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, data
),
6523 si
->dst_reg
, si
->src_reg
,
6524 offsetof(struct sk_buff
, data
));
6527 case offsetof(struct __sk_buff
, data_meta
):
6529 off
-= offsetof(struct __sk_buff
, data_meta
);
6530 off
+= offsetof(struct sk_buff
, cb
);
6531 off
+= offsetof(struct bpf_skb_data_end
, data_meta
);
6532 *insn
++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si
->dst_reg
,
6536 case offsetof(struct __sk_buff
, data_end
):
6538 off
-= offsetof(struct __sk_buff
, data_end
);
6539 off
+= offsetof(struct sk_buff
, cb
);
6540 off
+= offsetof(struct bpf_skb_data_end
, data_end
);
6541 *insn
++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si
->dst_reg
,
6545 case offsetof(struct __sk_buff
, tc_index
):
6546 #ifdef CONFIG_NET_SCHED
6547 if (type
== BPF_WRITE
)
6548 *insn
++ = BPF_STX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
6549 bpf_target_off(struct sk_buff
, tc_index
, 2,
6552 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
6553 bpf_target_off(struct sk_buff
, tc_index
, 2,
6557 if (type
== BPF_WRITE
)
6558 *insn
++ = BPF_MOV64_REG(si
->dst_reg
, si
->dst_reg
);
6560 *insn
++ = BPF_MOV64_IMM(si
->dst_reg
, 0);
6564 case offsetof(struct __sk_buff
, napi_id
):
6565 #if defined(CONFIG_NET_RX_BUSY_POLL)
6566 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6567 bpf_target_off(struct sk_buff
, napi_id
, 4,
6569 *insn
++ = BPF_JMP_IMM(BPF_JGE
, si
->dst_reg
, MIN_NAPI_ID
, 1);
6570 *insn
++ = BPF_MOV64_IMM(si
->dst_reg
, 0);
6573 *insn
++ = BPF_MOV64_IMM(si
->dst_reg
, 0);
6576 case offsetof(struct __sk_buff
, family
):
6577 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
, skc_family
) != 2);
6579 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
6580 si
->dst_reg
, si
->src_reg
,
6581 offsetof(struct sk_buff
, sk
));
6582 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
6583 bpf_target_off(struct sock_common
,
6587 case offsetof(struct __sk_buff
, remote_ip4
):
6588 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
, skc_daddr
) != 4);
6590 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
6591 si
->dst_reg
, si
->src_reg
,
6592 offsetof(struct sk_buff
, sk
));
6593 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
6594 bpf_target_off(struct sock_common
,
6598 case offsetof(struct __sk_buff
, local_ip4
):
6599 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
,
6600 skc_rcv_saddr
) != 4);
6602 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
6603 si
->dst_reg
, si
->src_reg
,
6604 offsetof(struct sk_buff
, sk
));
6605 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
6606 bpf_target_off(struct sock_common
,
6610 case offsetof(struct __sk_buff
, remote_ip6
[0]) ...
6611 offsetof(struct __sk_buff
, remote_ip6
[3]):
6612 #if IS_ENABLED(CONFIG_IPV6)
6613 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
,
6614 skc_v6_daddr
.s6_addr32
[0]) != 4);
6617 off
-= offsetof(struct __sk_buff
, remote_ip6
[0]);
6619 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
6620 si
->dst_reg
, si
->src_reg
,
6621 offsetof(struct sk_buff
, sk
));
6622 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
6623 offsetof(struct sock_common
,
6624 skc_v6_daddr
.s6_addr32
[0]) +
6627 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
6630 case offsetof(struct __sk_buff
, local_ip6
[0]) ...
6631 offsetof(struct __sk_buff
, local_ip6
[3]):
6632 #if IS_ENABLED(CONFIG_IPV6)
6633 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
,
6634 skc_v6_rcv_saddr
.s6_addr32
[0]) != 4);
6637 off
-= offsetof(struct __sk_buff
, local_ip6
[0]);
6639 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
6640 si
->dst_reg
, si
->src_reg
,
6641 offsetof(struct sk_buff
, sk
));
6642 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
6643 offsetof(struct sock_common
,
6644 skc_v6_rcv_saddr
.s6_addr32
[0]) +
6647 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
6651 case offsetof(struct __sk_buff
, remote_port
):
6652 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
, skc_dport
) != 2);
6654 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
6655 si
->dst_reg
, si
->src_reg
,
6656 offsetof(struct sk_buff
, sk
));
6657 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
6658 bpf_target_off(struct sock_common
,
6661 #ifndef __BIG_ENDIAN_BITFIELD
6662 *insn
++ = BPF_ALU32_IMM(BPF_LSH
, si
->dst_reg
, 16);
6666 case offsetof(struct __sk_buff
, local_port
):
6667 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
, skc_num
) != 2);
6669 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
6670 si
->dst_reg
, si
->src_reg
,
6671 offsetof(struct sk_buff
, sk
));
6672 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
6673 bpf_target_off(struct sock_common
,
6674 skc_num
, 2, target_size
));
6677 case offsetof(struct __sk_buff
, flow_keys
):
6679 off
-= offsetof(struct __sk_buff
, flow_keys
);
6680 off
+= offsetof(struct sk_buff
, cb
);
6681 off
+= offsetof(struct qdisc_skb_cb
, flow_keys
);
6682 *insn
++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si
->dst_reg
,
6686 case offsetof(struct __sk_buff
, tstamp
):
6687 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff
, tstamp
) != 8);
6689 if (type
== BPF_WRITE
)
6690 *insn
++ = BPF_STX_MEM(BPF_DW
,
6691 si
->dst_reg
, si
->src_reg
,
6692 bpf_target_off(struct sk_buff
,
6696 *insn
++ = BPF_LDX_MEM(BPF_DW
,
6697 si
->dst_reg
, si
->src_reg
,
6698 bpf_target_off(struct sk_buff
,
6703 case offsetof(struct __sk_buff
, wire_len
):
6704 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb
, pkt_len
) != 4);
6707 off
-= offsetof(struct __sk_buff
, wire_len
);
6708 off
+= offsetof(struct sk_buff
, cb
);
6709 off
+= offsetof(struct qdisc_skb_cb
, pkt_len
);
6711 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
, off
);
6714 return insn
- insn_buf
;
6717 u32
bpf_sock_convert_ctx_access(enum bpf_access_type type
,
6718 const struct bpf_insn
*si
,
6719 struct bpf_insn
*insn_buf
,
6720 struct bpf_prog
*prog
, u32
*target_size
)
6722 struct bpf_insn
*insn
= insn_buf
;
6726 case offsetof(struct bpf_sock
, bound_dev_if
):
6727 BUILD_BUG_ON(FIELD_SIZEOF(struct sock
, sk_bound_dev_if
) != 4);
6729 if (type
== BPF_WRITE
)
6730 *insn
++ = BPF_STX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6731 offsetof(struct sock
, sk_bound_dev_if
));
6733 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6734 offsetof(struct sock
, sk_bound_dev_if
));
6737 case offsetof(struct bpf_sock
, mark
):
6738 BUILD_BUG_ON(FIELD_SIZEOF(struct sock
, sk_mark
) != 4);
6740 if (type
== BPF_WRITE
)
6741 *insn
++ = BPF_STX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6742 offsetof(struct sock
, sk_mark
));
6744 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6745 offsetof(struct sock
, sk_mark
));
6748 case offsetof(struct bpf_sock
, priority
):
6749 BUILD_BUG_ON(FIELD_SIZEOF(struct sock
, sk_priority
) != 4);
6751 if (type
== BPF_WRITE
)
6752 *insn
++ = BPF_STX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6753 offsetof(struct sock
, sk_priority
));
6755 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6756 offsetof(struct sock
, sk_priority
));
6759 case offsetof(struct bpf_sock
, family
):
6760 BUILD_BUG_ON(FIELD_SIZEOF(struct sock
, sk_family
) != 2);
6762 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
6763 offsetof(struct sock
, sk_family
));
6766 case offsetof(struct bpf_sock
, type
):
6767 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6768 offsetof(struct sock
, __sk_flags_offset
));
6769 *insn
++ = BPF_ALU32_IMM(BPF_AND
, si
->dst_reg
, SK_FL_TYPE_MASK
);
6770 *insn
++ = BPF_ALU32_IMM(BPF_RSH
, si
->dst_reg
, SK_FL_TYPE_SHIFT
);
6773 case offsetof(struct bpf_sock
, protocol
):
6774 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
6775 offsetof(struct sock
, __sk_flags_offset
));
6776 *insn
++ = BPF_ALU32_IMM(BPF_AND
, si
->dst_reg
, SK_FL_PROTO_MASK
);
6777 *insn
++ = BPF_ALU32_IMM(BPF_RSH
, si
->dst_reg
, SK_FL_PROTO_SHIFT
);
6780 case offsetof(struct bpf_sock
, src_ip4
):
6781 *insn
++ = BPF_LDX_MEM(
6782 BPF_SIZE(si
->code
), si
->dst_reg
, si
->src_reg
,
6783 bpf_target_off(struct sock_common
, skc_rcv_saddr
,
6784 FIELD_SIZEOF(struct sock_common
,
6789 case bpf_ctx_range_till(struct bpf_sock
, src_ip6
[0], src_ip6
[3]):
6790 #if IS_ENABLED(CONFIG_IPV6)
6792 off
-= offsetof(struct bpf_sock
, src_ip6
[0]);
6793 *insn
++ = BPF_LDX_MEM(
6794 BPF_SIZE(si
->code
), si
->dst_reg
, si
->src_reg
,
6797 skc_v6_rcv_saddr
.s6_addr32
[0],
6798 FIELD_SIZEOF(struct sock_common
,
6799 skc_v6_rcv_saddr
.s6_addr32
[0]),
6800 target_size
) + off
);
6803 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
6807 case offsetof(struct bpf_sock
, src_port
):
6808 *insn
++ = BPF_LDX_MEM(
6809 BPF_FIELD_SIZEOF(struct sock_common
, skc_num
),
6810 si
->dst_reg
, si
->src_reg
,
6811 bpf_target_off(struct sock_common
, skc_num
,
6812 FIELD_SIZEOF(struct sock_common
,
6818 return insn
- insn_buf
;
6821 static u32
tc_cls_act_convert_ctx_access(enum bpf_access_type type
,
6822 const struct bpf_insn
*si
,
6823 struct bpf_insn
*insn_buf
,
6824 struct bpf_prog
*prog
, u32
*target_size
)
6826 struct bpf_insn
*insn
= insn_buf
;
6829 case offsetof(struct __sk_buff
, ifindex
):
6830 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, dev
),
6831 si
->dst_reg
, si
->src_reg
,
6832 offsetof(struct sk_buff
, dev
));
6833 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
6834 bpf_target_off(struct net_device
, ifindex
, 4,
6838 return bpf_convert_ctx_access(type
, si
, insn_buf
, prog
,
6842 return insn
- insn_buf
;
6845 static u32
xdp_convert_ctx_access(enum bpf_access_type type
,
6846 const struct bpf_insn
*si
,
6847 struct bpf_insn
*insn_buf
,
6848 struct bpf_prog
*prog
, u32
*target_size
)
6850 struct bpf_insn
*insn
= insn_buf
;
6853 case offsetof(struct xdp_md
, data
):
6854 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, data
),
6855 si
->dst_reg
, si
->src_reg
,
6856 offsetof(struct xdp_buff
, data
));
6858 case offsetof(struct xdp_md
, data_meta
):
6859 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, data_meta
),
6860 si
->dst_reg
, si
->src_reg
,
6861 offsetof(struct xdp_buff
, data_meta
));
6863 case offsetof(struct xdp_md
, data_end
):
6864 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, data_end
),
6865 si
->dst_reg
, si
->src_reg
,
6866 offsetof(struct xdp_buff
, data_end
));
6868 case offsetof(struct xdp_md
, ingress_ifindex
):
6869 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, rxq
),
6870 si
->dst_reg
, si
->src_reg
,
6871 offsetof(struct xdp_buff
, rxq
));
6872 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info
, dev
),
6873 si
->dst_reg
, si
->dst_reg
,
6874 offsetof(struct xdp_rxq_info
, dev
));
6875 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
6876 offsetof(struct net_device
, ifindex
));
6878 case offsetof(struct xdp_md
, rx_queue_index
):
6879 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, rxq
),
6880 si
->dst_reg
, si
->src_reg
,
6881 offsetof(struct xdp_buff
, rxq
));
6882 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
6883 offsetof(struct xdp_rxq_info
,
6888 return insn
- insn_buf
;
6891 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of
6892 * context Structure, F is Field in context structure that contains a pointer
6893 * to Nested Structure of type NS that has the field NF.
6895 * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make
6896 * sure that SIZE is not greater than actual size of S.F.NF.
6898 * If offset OFF is provided, the load happens from that offset relative to
6901 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \
6903 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \
6904 si->src_reg, offsetof(S, F)); \
6905 *insn++ = BPF_LDX_MEM( \
6906 SIZE, si->dst_reg, si->dst_reg, \
6907 bpf_target_off(NS, NF, FIELD_SIZEOF(NS, NF), \
6912 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \
6913 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \
6914 BPF_FIELD_SIZEOF(NS, NF), 0)
6916 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to
6917 * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation.
6919 * It doesn't support SIZE argument though since narrow stores are not
6920 * supported for now.
6922 * In addition it uses Temporary Field TF (member of struct S) as the 3rd
6923 * "register" since two registers available in convert_ctx_access are not
6924 * enough: we can't override neither SRC, since it contains value to store, nor
6925 * DST since it contains pointer to context that may be used by later
6926 * instructions. But we need a temporary place to save pointer to nested
6927 * structure whose field we want to store to.
6929 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, OFF, TF) \
6931 int tmp_reg = BPF_REG_9; \
6932 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \
6934 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \
6936 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \
6938 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \
6939 si->dst_reg, offsetof(S, F)); \
6940 *insn++ = BPF_STX_MEM( \
6941 BPF_FIELD_SIZEOF(NS, NF), tmp_reg, si->src_reg, \
6942 bpf_target_off(NS, NF, FIELD_SIZEOF(NS, NF), \
6945 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \
6949 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \
6952 if (type == BPF_WRITE) { \
6953 SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, OFF, \
6956 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \
6957 S, NS, F, NF, SIZE, OFF); \
6961 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \
6962 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \
6963 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF)
6965 static u32
sock_addr_convert_ctx_access(enum bpf_access_type type
,
6966 const struct bpf_insn
*si
,
6967 struct bpf_insn
*insn_buf
,
6968 struct bpf_prog
*prog
, u32
*target_size
)
6970 struct bpf_insn
*insn
= insn_buf
;
6974 case offsetof(struct bpf_sock_addr
, user_family
):
6975 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern
,
6976 struct sockaddr
, uaddr
, sa_family
);
6979 case offsetof(struct bpf_sock_addr
, user_ip4
):
6980 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
6981 struct bpf_sock_addr_kern
, struct sockaddr_in
, uaddr
,
6982 sin_addr
, BPF_SIZE(si
->code
), 0, tmp_reg
);
6985 case bpf_ctx_range_till(struct bpf_sock_addr
, user_ip6
[0], user_ip6
[3]):
6987 off
-= offsetof(struct bpf_sock_addr
, user_ip6
[0]);
6988 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
6989 struct bpf_sock_addr_kern
, struct sockaddr_in6
, uaddr
,
6990 sin6_addr
.s6_addr32
[0], BPF_SIZE(si
->code
), off
,
6994 case offsetof(struct bpf_sock_addr
, user_port
):
6995 /* To get port we need to know sa_family first and then treat
6996 * sockaddr as either sockaddr_in or sockaddr_in6.
6997 * Though we can simplify since port field has same offset and
6998 * size in both structures.
6999 * Here we check this invariant and use just one of the
7000 * structures if it's true.
7002 BUILD_BUG_ON(offsetof(struct sockaddr_in
, sin_port
) !=
7003 offsetof(struct sockaddr_in6
, sin6_port
));
7004 BUILD_BUG_ON(FIELD_SIZEOF(struct sockaddr_in
, sin_port
) !=
7005 FIELD_SIZEOF(struct sockaddr_in6
, sin6_port
));
7006 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(struct bpf_sock_addr_kern
,
7007 struct sockaddr_in6
, uaddr
,
7008 sin6_port
, tmp_reg
);
7011 case offsetof(struct bpf_sock_addr
, family
):
7012 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern
,
7013 struct sock
, sk
, sk_family
);
7016 case offsetof(struct bpf_sock_addr
, type
):
7017 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(
7018 struct bpf_sock_addr_kern
, struct sock
, sk
,
7019 __sk_flags_offset
, BPF_W
, 0);
7020 *insn
++ = BPF_ALU32_IMM(BPF_AND
, si
->dst_reg
, SK_FL_TYPE_MASK
);
7021 *insn
++ = BPF_ALU32_IMM(BPF_RSH
, si
->dst_reg
, SK_FL_TYPE_SHIFT
);
7024 case offsetof(struct bpf_sock_addr
, protocol
):
7025 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(
7026 struct bpf_sock_addr_kern
, struct sock
, sk
,
7027 __sk_flags_offset
, BPF_W
, 0);
7028 *insn
++ = BPF_ALU32_IMM(BPF_AND
, si
->dst_reg
, SK_FL_PROTO_MASK
);
7029 *insn
++ = BPF_ALU32_IMM(BPF_RSH
, si
->dst_reg
,
7033 case offsetof(struct bpf_sock_addr
, msg_src_ip4
):
7034 /* Treat t_ctx as struct in_addr for msg_src_ip4. */
7035 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
7036 struct bpf_sock_addr_kern
, struct in_addr
, t_ctx
,
7037 s_addr
, BPF_SIZE(si
->code
), 0, tmp_reg
);
7040 case bpf_ctx_range_till(struct bpf_sock_addr
, msg_src_ip6
[0],
7043 off
-= offsetof(struct bpf_sock_addr
, msg_src_ip6
[0]);
7044 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */
7045 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
7046 struct bpf_sock_addr_kern
, struct in6_addr
, t_ctx
,
7047 s6_addr32
[0], BPF_SIZE(si
->code
), off
, tmp_reg
);
7051 return insn
- insn_buf
;
7054 static u32
sock_ops_convert_ctx_access(enum bpf_access_type type
,
7055 const struct bpf_insn
*si
,
7056 struct bpf_insn
*insn_buf
,
7057 struct bpf_prog
*prog
,
7060 struct bpf_insn
*insn
= insn_buf
;
7064 case offsetof(struct bpf_sock_ops
, op
) ...
7065 offsetof(struct bpf_sock_ops
, replylong
[3]):
7066 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops
, op
) !=
7067 FIELD_SIZEOF(struct bpf_sock_ops_kern
, op
));
7068 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops
, reply
) !=
7069 FIELD_SIZEOF(struct bpf_sock_ops_kern
, reply
));
7070 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops
, replylong
) !=
7071 FIELD_SIZEOF(struct bpf_sock_ops_kern
, replylong
));
7073 off
-= offsetof(struct bpf_sock_ops
, op
);
7074 off
+= offsetof(struct bpf_sock_ops_kern
, op
);
7075 if (type
== BPF_WRITE
)
7076 *insn
++ = BPF_STX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7079 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7083 case offsetof(struct bpf_sock_ops
, family
):
7084 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
, skc_family
) != 2);
7086 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7087 struct bpf_sock_ops_kern
, sk
),
7088 si
->dst_reg
, si
->src_reg
,
7089 offsetof(struct bpf_sock_ops_kern
, sk
));
7090 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
7091 offsetof(struct sock_common
, skc_family
));
7094 case offsetof(struct bpf_sock_ops
, remote_ip4
):
7095 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
, skc_daddr
) != 4);
7097 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7098 struct bpf_sock_ops_kern
, sk
),
7099 si
->dst_reg
, si
->src_reg
,
7100 offsetof(struct bpf_sock_ops_kern
, sk
));
7101 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7102 offsetof(struct sock_common
, skc_daddr
));
7105 case offsetof(struct bpf_sock_ops
, local_ip4
):
7106 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
,
7107 skc_rcv_saddr
) != 4);
7109 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7110 struct bpf_sock_ops_kern
, sk
),
7111 si
->dst_reg
, si
->src_reg
,
7112 offsetof(struct bpf_sock_ops_kern
, sk
));
7113 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7114 offsetof(struct sock_common
,
7118 case offsetof(struct bpf_sock_ops
, remote_ip6
[0]) ...
7119 offsetof(struct bpf_sock_ops
, remote_ip6
[3]):
7120 #if IS_ENABLED(CONFIG_IPV6)
7121 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
,
7122 skc_v6_daddr
.s6_addr32
[0]) != 4);
7125 off
-= offsetof(struct bpf_sock_ops
, remote_ip6
[0]);
7126 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7127 struct bpf_sock_ops_kern
, sk
),
7128 si
->dst_reg
, si
->src_reg
,
7129 offsetof(struct bpf_sock_ops_kern
, sk
));
7130 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7131 offsetof(struct sock_common
,
7132 skc_v6_daddr
.s6_addr32
[0]) +
7135 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
7139 case offsetof(struct bpf_sock_ops
, local_ip6
[0]) ...
7140 offsetof(struct bpf_sock_ops
, local_ip6
[3]):
7141 #if IS_ENABLED(CONFIG_IPV6)
7142 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
,
7143 skc_v6_rcv_saddr
.s6_addr32
[0]) != 4);
7146 off
-= offsetof(struct bpf_sock_ops
, local_ip6
[0]);
7147 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7148 struct bpf_sock_ops_kern
, sk
),
7149 si
->dst_reg
, si
->src_reg
,
7150 offsetof(struct bpf_sock_ops_kern
, sk
));
7151 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7152 offsetof(struct sock_common
,
7153 skc_v6_rcv_saddr
.s6_addr32
[0]) +
7156 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
7160 case offsetof(struct bpf_sock_ops
, remote_port
):
7161 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
, skc_dport
) != 2);
7163 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7164 struct bpf_sock_ops_kern
, sk
),
7165 si
->dst_reg
, si
->src_reg
,
7166 offsetof(struct bpf_sock_ops_kern
, sk
));
7167 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
7168 offsetof(struct sock_common
, skc_dport
));
7169 #ifndef __BIG_ENDIAN_BITFIELD
7170 *insn
++ = BPF_ALU32_IMM(BPF_LSH
, si
->dst_reg
, 16);
7174 case offsetof(struct bpf_sock_ops
, local_port
):
7175 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
, skc_num
) != 2);
7177 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7178 struct bpf_sock_ops_kern
, sk
),
7179 si
->dst_reg
, si
->src_reg
,
7180 offsetof(struct bpf_sock_ops_kern
, sk
));
7181 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
7182 offsetof(struct sock_common
, skc_num
));
7185 case offsetof(struct bpf_sock_ops
, is_fullsock
):
7186 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7187 struct bpf_sock_ops_kern
,
7189 si
->dst_reg
, si
->src_reg
,
7190 offsetof(struct bpf_sock_ops_kern
,
7194 case offsetof(struct bpf_sock_ops
, state
):
7195 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
, skc_state
) != 1);
7197 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7198 struct bpf_sock_ops_kern
, sk
),
7199 si
->dst_reg
, si
->src_reg
,
7200 offsetof(struct bpf_sock_ops_kern
, sk
));
7201 *insn
++ = BPF_LDX_MEM(BPF_B
, si
->dst_reg
, si
->dst_reg
,
7202 offsetof(struct sock_common
, skc_state
));
7205 case offsetof(struct bpf_sock_ops
, rtt_min
):
7206 BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock
, rtt_min
) !=
7207 sizeof(struct minmax
));
7208 BUILD_BUG_ON(sizeof(struct minmax
) <
7209 sizeof(struct minmax_sample
));
7211 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7212 struct bpf_sock_ops_kern
, sk
),
7213 si
->dst_reg
, si
->src_reg
,
7214 offsetof(struct bpf_sock_ops_kern
, sk
));
7215 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7216 offsetof(struct tcp_sock
, rtt_min
) +
7217 FIELD_SIZEOF(struct minmax_sample
, t
));
7220 /* Helper macro for adding read access to tcp_sock or sock fields. */
7221 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
7223 BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \
7224 FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \
7225 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
7226 struct bpf_sock_ops_kern, \
7228 si->dst_reg, si->src_reg, \
7229 offsetof(struct bpf_sock_ops_kern, \
7231 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 2); \
7232 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
7233 struct bpf_sock_ops_kern, sk),\
7234 si->dst_reg, si->src_reg, \
7235 offsetof(struct bpf_sock_ops_kern, sk));\
7236 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \
7238 si->dst_reg, si->dst_reg, \
7239 offsetof(OBJ, OBJ_FIELD)); \
7242 /* Helper macro for adding write access to tcp_sock or sock fields.
7243 * The macro is called with two registers, dst_reg which contains a pointer
7244 * to ctx (context) and src_reg which contains the value that should be
7245 * stored. However, we need an additional register since we cannot overwrite
7246 * dst_reg because it may be used later in the program.
7247 * Instead we "borrow" one of the other register. We first save its value
7248 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore
7249 * it at the end of the macro.
7251 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
7253 int reg = BPF_REG_9; \
7254 BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \
7255 FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \
7256 if (si->dst_reg == reg || si->src_reg == reg) \
7258 if (si->dst_reg == reg || si->src_reg == reg) \
7260 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \
7261 offsetof(struct bpf_sock_ops_kern, \
7263 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
7264 struct bpf_sock_ops_kern, \
7267 offsetof(struct bpf_sock_ops_kern, \
7269 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \
7270 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
7271 struct bpf_sock_ops_kern, sk),\
7273 offsetof(struct bpf_sock_ops_kern, sk));\
7274 *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD), \
7276 offsetof(OBJ, OBJ_FIELD)); \
7277 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \
7278 offsetof(struct bpf_sock_ops_kern, \
7282 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \
7284 if (TYPE == BPF_WRITE) \
7285 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \
7287 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \
7290 case offsetof(struct bpf_sock_ops
, snd_cwnd
):
7291 SOCK_OPS_GET_FIELD(snd_cwnd
, snd_cwnd
, struct tcp_sock
);
7294 case offsetof(struct bpf_sock_ops
, srtt_us
):
7295 SOCK_OPS_GET_FIELD(srtt_us
, srtt_us
, struct tcp_sock
);
7298 case offsetof(struct bpf_sock_ops
, bpf_sock_ops_cb_flags
):
7299 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags
, bpf_sock_ops_cb_flags
,
7303 case offsetof(struct bpf_sock_ops
, snd_ssthresh
):
7304 SOCK_OPS_GET_FIELD(snd_ssthresh
, snd_ssthresh
, struct tcp_sock
);
7307 case offsetof(struct bpf_sock_ops
, rcv_nxt
):
7308 SOCK_OPS_GET_FIELD(rcv_nxt
, rcv_nxt
, struct tcp_sock
);
7311 case offsetof(struct bpf_sock_ops
, snd_nxt
):
7312 SOCK_OPS_GET_FIELD(snd_nxt
, snd_nxt
, struct tcp_sock
);
7315 case offsetof(struct bpf_sock_ops
, snd_una
):
7316 SOCK_OPS_GET_FIELD(snd_una
, snd_una
, struct tcp_sock
);
7319 case offsetof(struct bpf_sock_ops
, mss_cache
):
7320 SOCK_OPS_GET_FIELD(mss_cache
, mss_cache
, struct tcp_sock
);
7323 case offsetof(struct bpf_sock_ops
, ecn_flags
):
7324 SOCK_OPS_GET_FIELD(ecn_flags
, ecn_flags
, struct tcp_sock
);
7327 case offsetof(struct bpf_sock_ops
, rate_delivered
):
7328 SOCK_OPS_GET_FIELD(rate_delivered
, rate_delivered
,
7332 case offsetof(struct bpf_sock_ops
, rate_interval_us
):
7333 SOCK_OPS_GET_FIELD(rate_interval_us
, rate_interval_us
,
7337 case offsetof(struct bpf_sock_ops
, packets_out
):
7338 SOCK_OPS_GET_FIELD(packets_out
, packets_out
, struct tcp_sock
);
7341 case offsetof(struct bpf_sock_ops
, retrans_out
):
7342 SOCK_OPS_GET_FIELD(retrans_out
, retrans_out
, struct tcp_sock
);
7345 case offsetof(struct bpf_sock_ops
, total_retrans
):
7346 SOCK_OPS_GET_FIELD(total_retrans
, total_retrans
,
7350 case offsetof(struct bpf_sock_ops
, segs_in
):
7351 SOCK_OPS_GET_FIELD(segs_in
, segs_in
, struct tcp_sock
);
7354 case offsetof(struct bpf_sock_ops
, data_segs_in
):
7355 SOCK_OPS_GET_FIELD(data_segs_in
, data_segs_in
, struct tcp_sock
);
7358 case offsetof(struct bpf_sock_ops
, segs_out
):
7359 SOCK_OPS_GET_FIELD(segs_out
, segs_out
, struct tcp_sock
);
7362 case offsetof(struct bpf_sock_ops
, data_segs_out
):
7363 SOCK_OPS_GET_FIELD(data_segs_out
, data_segs_out
,
7367 case offsetof(struct bpf_sock_ops
, lost_out
):
7368 SOCK_OPS_GET_FIELD(lost_out
, lost_out
, struct tcp_sock
);
7371 case offsetof(struct bpf_sock_ops
, sacked_out
):
7372 SOCK_OPS_GET_FIELD(sacked_out
, sacked_out
, struct tcp_sock
);
7375 case offsetof(struct bpf_sock_ops
, sk_txhash
):
7376 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash
, sk_txhash
,
7380 case offsetof(struct bpf_sock_ops
, bytes_received
):
7381 SOCK_OPS_GET_FIELD(bytes_received
, bytes_received
,
7385 case offsetof(struct bpf_sock_ops
, bytes_acked
):
7386 SOCK_OPS_GET_FIELD(bytes_acked
, bytes_acked
, struct tcp_sock
);
7390 return insn
- insn_buf
;
7393 static u32
sk_skb_convert_ctx_access(enum bpf_access_type type
,
7394 const struct bpf_insn
*si
,
7395 struct bpf_insn
*insn_buf
,
7396 struct bpf_prog
*prog
, u32
*target_size
)
7398 struct bpf_insn
*insn
= insn_buf
;
7402 case offsetof(struct __sk_buff
, data_end
):
7404 off
-= offsetof(struct __sk_buff
, data_end
);
7405 off
+= offsetof(struct sk_buff
, cb
);
7406 off
+= offsetof(struct tcp_skb_cb
, bpf
.data_end
);
7407 *insn
++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si
->dst_reg
,
7411 return bpf_convert_ctx_access(type
, si
, insn_buf
, prog
,
7415 return insn
- insn_buf
;
7418 static u32
sk_msg_convert_ctx_access(enum bpf_access_type type
,
7419 const struct bpf_insn
*si
,
7420 struct bpf_insn
*insn_buf
,
7421 struct bpf_prog
*prog
, u32
*target_size
)
7423 struct bpf_insn
*insn
= insn_buf
;
7424 #if IS_ENABLED(CONFIG_IPV6)
7428 /* convert ctx uses the fact sg element is first in struct */
7429 BUILD_BUG_ON(offsetof(struct sk_msg
, sg
) != 0);
7432 case offsetof(struct sk_msg_md
, data
):
7433 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg
, data
),
7434 si
->dst_reg
, si
->src_reg
,
7435 offsetof(struct sk_msg
, data
));
7437 case offsetof(struct sk_msg_md
, data_end
):
7438 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg
, data_end
),
7439 si
->dst_reg
, si
->src_reg
,
7440 offsetof(struct sk_msg
, data_end
));
7442 case offsetof(struct sk_msg_md
, family
):
7443 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
, skc_family
) != 2);
7445 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7447 si
->dst_reg
, si
->src_reg
,
7448 offsetof(struct sk_msg
, sk
));
7449 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
7450 offsetof(struct sock_common
, skc_family
));
7453 case offsetof(struct sk_msg_md
, remote_ip4
):
7454 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
, skc_daddr
) != 4);
7456 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7458 si
->dst_reg
, si
->src_reg
,
7459 offsetof(struct sk_msg
, sk
));
7460 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7461 offsetof(struct sock_common
, skc_daddr
));
7464 case offsetof(struct sk_msg_md
, local_ip4
):
7465 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
,
7466 skc_rcv_saddr
) != 4);
7468 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7470 si
->dst_reg
, si
->src_reg
,
7471 offsetof(struct sk_msg
, sk
));
7472 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7473 offsetof(struct sock_common
,
7477 case offsetof(struct sk_msg_md
, remote_ip6
[0]) ...
7478 offsetof(struct sk_msg_md
, remote_ip6
[3]):
7479 #if IS_ENABLED(CONFIG_IPV6)
7480 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
,
7481 skc_v6_daddr
.s6_addr32
[0]) != 4);
7484 off
-= offsetof(struct sk_msg_md
, remote_ip6
[0]);
7485 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7487 si
->dst_reg
, si
->src_reg
,
7488 offsetof(struct sk_msg
, sk
));
7489 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7490 offsetof(struct sock_common
,
7491 skc_v6_daddr
.s6_addr32
[0]) +
7494 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
7498 case offsetof(struct sk_msg_md
, local_ip6
[0]) ...
7499 offsetof(struct sk_msg_md
, local_ip6
[3]):
7500 #if IS_ENABLED(CONFIG_IPV6)
7501 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
,
7502 skc_v6_rcv_saddr
.s6_addr32
[0]) != 4);
7505 off
-= offsetof(struct sk_msg_md
, local_ip6
[0]);
7506 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7508 si
->dst_reg
, si
->src_reg
,
7509 offsetof(struct sk_msg
, sk
));
7510 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
7511 offsetof(struct sock_common
,
7512 skc_v6_rcv_saddr
.s6_addr32
[0]) +
7515 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
7519 case offsetof(struct sk_msg_md
, remote_port
):
7520 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
, skc_dport
) != 2);
7522 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7524 si
->dst_reg
, si
->src_reg
,
7525 offsetof(struct sk_msg
, sk
));
7526 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
7527 offsetof(struct sock_common
, skc_dport
));
7528 #ifndef __BIG_ENDIAN_BITFIELD
7529 *insn
++ = BPF_ALU32_IMM(BPF_LSH
, si
->dst_reg
, 16);
7533 case offsetof(struct sk_msg_md
, local_port
):
7534 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common
, skc_num
) != 2);
7536 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
7538 si
->dst_reg
, si
->src_reg
,
7539 offsetof(struct sk_msg
, sk
));
7540 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
7541 offsetof(struct sock_common
, skc_num
));
7544 case offsetof(struct sk_msg_md
, size
):
7545 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg
, size
),
7546 si
->dst_reg
, si
->src_reg
,
7547 offsetof(struct sk_msg_sg
, size
));
7551 return insn
- insn_buf
;
7554 const struct bpf_verifier_ops sk_filter_verifier_ops
= {
7555 .get_func_proto
= sk_filter_func_proto
,
7556 .is_valid_access
= sk_filter_is_valid_access
,
7557 .convert_ctx_access
= bpf_convert_ctx_access
,
7558 .gen_ld_abs
= bpf_gen_ld_abs
,
7561 const struct bpf_prog_ops sk_filter_prog_ops
= {
7562 .test_run
= bpf_prog_test_run_skb
,
7565 const struct bpf_verifier_ops tc_cls_act_verifier_ops
= {
7566 .get_func_proto
= tc_cls_act_func_proto
,
7567 .is_valid_access
= tc_cls_act_is_valid_access
,
7568 .convert_ctx_access
= tc_cls_act_convert_ctx_access
,
7569 .gen_prologue
= tc_cls_act_prologue
,
7570 .gen_ld_abs
= bpf_gen_ld_abs
,
7573 const struct bpf_prog_ops tc_cls_act_prog_ops
= {
7574 .test_run
= bpf_prog_test_run_skb
,
7577 const struct bpf_verifier_ops xdp_verifier_ops
= {
7578 .get_func_proto
= xdp_func_proto
,
7579 .is_valid_access
= xdp_is_valid_access
,
7580 .convert_ctx_access
= xdp_convert_ctx_access
,
7581 .gen_prologue
= bpf_noop_prologue
,
7584 const struct bpf_prog_ops xdp_prog_ops
= {
7585 .test_run
= bpf_prog_test_run_xdp
,
7588 const struct bpf_verifier_ops cg_skb_verifier_ops
= {
7589 .get_func_proto
= cg_skb_func_proto
,
7590 .is_valid_access
= cg_skb_is_valid_access
,
7591 .convert_ctx_access
= bpf_convert_ctx_access
,
7594 const struct bpf_prog_ops cg_skb_prog_ops
= {
7595 .test_run
= bpf_prog_test_run_skb
,
7598 const struct bpf_verifier_ops lwt_in_verifier_ops
= {
7599 .get_func_proto
= lwt_in_func_proto
,
7600 .is_valid_access
= lwt_is_valid_access
,
7601 .convert_ctx_access
= bpf_convert_ctx_access
,
7604 const struct bpf_prog_ops lwt_in_prog_ops
= {
7605 .test_run
= bpf_prog_test_run_skb
,
7608 const struct bpf_verifier_ops lwt_out_verifier_ops
= {
7609 .get_func_proto
= lwt_out_func_proto
,
7610 .is_valid_access
= lwt_is_valid_access
,
7611 .convert_ctx_access
= bpf_convert_ctx_access
,
7614 const struct bpf_prog_ops lwt_out_prog_ops
= {
7615 .test_run
= bpf_prog_test_run_skb
,
7618 const struct bpf_verifier_ops lwt_xmit_verifier_ops
= {
7619 .get_func_proto
= lwt_xmit_func_proto
,
7620 .is_valid_access
= lwt_is_valid_access
,
7621 .convert_ctx_access
= bpf_convert_ctx_access
,
7622 .gen_prologue
= tc_cls_act_prologue
,
7625 const struct bpf_prog_ops lwt_xmit_prog_ops
= {
7626 .test_run
= bpf_prog_test_run_skb
,
7629 const struct bpf_verifier_ops lwt_seg6local_verifier_ops
= {
7630 .get_func_proto
= lwt_seg6local_func_proto
,
7631 .is_valid_access
= lwt_is_valid_access
,
7632 .convert_ctx_access
= bpf_convert_ctx_access
,
7635 const struct bpf_prog_ops lwt_seg6local_prog_ops
= {
7636 .test_run
= bpf_prog_test_run_skb
,
7639 const struct bpf_verifier_ops cg_sock_verifier_ops
= {
7640 .get_func_proto
= sock_filter_func_proto
,
7641 .is_valid_access
= sock_filter_is_valid_access
,
7642 .convert_ctx_access
= bpf_sock_convert_ctx_access
,
7645 const struct bpf_prog_ops cg_sock_prog_ops
= {
7648 const struct bpf_verifier_ops cg_sock_addr_verifier_ops
= {
7649 .get_func_proto
= sock_addr_func_proto
,
7650 .is_valid_access
= sock_addr_is_valid_access
,
7651 .convert_ctx_access
= sock_addr_convert_ctx_access
,
7654 const struct bpf_prog_ops cg_sock_addr_prog_ops
= {
7657 const struct bpf_verifier_ops sock_ops_verifier_ops
= {
7658 .get_func_proto
= sock_ops_func_proto
,
7659 .is_valid_access
= sock_ops_is_valid_access
,
7660 .convert_ctx_access
= sock_ops_convert_ctx_access
,
7663 const struct bpf_prog_ops sock_ops_prog_ops
= {
7666 const struct bpf_verifier_ops sk_skb_verifier_ops
= {
7667 .get_func_proto
= sk_skb_func_proto
,
7668 .is_valid_access
= sk_skb_is_valid_access
,
7669 .convert_ctx_access
= sk_skb_convert_ctx_access
,
7670 .gen_prologue
= sk_skb_prologue
,
7673 const struct bpf_prog_ops sk_skb_prog_ops
= {
7676 const struct bpf_verifier_ops sk_msg_verifier_ops
= {
7677 .get_func_proto
= sk_msg_func_proto
,
7678 .is_valid_access
= sk_msg_is_valid_access
,
7679 .convert_ctx_access
= sk_msg_convert_ctx_access
,
7680 .gen_prologue
= bpf_noop_prologue
,
7683 const struct bpf_prog_ops sk_msg_prog_ops
= {
7686 const struct bpf_verifier_ops flow_dissector_verifier_ops
= {
7687 .get_func_proto
= flow_dissector_func_proto
,
7688 .is_valid_access
= flow_dissector_is_valid_access
,
7689 .convert_ctx_access
= bpf_convert_ctx_access
,
7692 const struct bpf_prog_ops flow_dissector_prog_ops
= {
7695 int sk_detach_filter(struct sock
*sk
)
7698 struct sk_filter
*filter
;
7700 if (sock_flag(sk
, SOCK_FILTER_LOCKED
))
7703 filter
= rcu_dereference_protected(sk
->sk_filter
,
7704 lockdep_sock_is_held(sk
));
7706 RCU_INIT_POINTER(sk
->sk_filter
, NULL
);
7707 sk_filter_uncharge(sk
, filter
);
7713 EXPORT_SYMBOL_GPL(sk_detach_filter
);
7715 int sk_get_filter(struct sock
*sk
, struct sock_filter __user
*ubuf
,
7718 struct sock_fprog_kern
*fprog
;
7719 struct sk_filter
*filter
;
7723 filter
= rcu_dereference_protected(sk
->sk_filter
,
7724 lockdep_sock_is_held(sk
));
7728 /* We're copying the filter that has been originally attached,
7729 * so no conversion/decode needed anymore. eBPF programs that
7730 * have no original program cannot be dumped through this.
7733 fprog
= filter
->prog
->orig_prog
;
7739 /* User space only enquires number of filter blocks. */
7743 if (len
< fprog
->len
)
7747 if (copy_to_user(ubuf
, fprog
->filter
, bpf_classic_proglen(fprog
)))
7750 /* Instead of bytes, the API requests to return the number
7760 struct sk_reuseport_kern
{
7761 struct sk_buff
*skb
;
7763 struct sock
*selected_sk
;
7770 static void bpf_init_reuseport_kern(struct sk_reuseport_kern
*reuse_kern
,
7771 struct sock_reuseport
*reuse
,
7772 struct sock
*sk
, struct sk_buff
*skb
,
7775 reuse_kern
->skb
= skb
;
7776 reuse_kern
->sk
= sk
;
7777 reuse_kern
->selected_sk
= NULL
;
7778 reuse_kern
->data_end
= skb
->data
+ skb_headlen(skb
);
7779 reuse_kern
->hash
= hash
;
7780 reuse_kern
->reuseport_id
= reuse
->reuseport_id
;
7781 reuse_kern
->bind_inany
= reuse
->bind_inany
;
7784 struct sock
*bpf_run_sk_reuseport(struct sock_reuseport
*reuse
, struct sock
*sk
,
7785 struct bpf_prog
*prog
, struct sk_buff
*skb
,
7788 struct sk_reuseport_kern reuse_kern
;
7789 enum sk_action action
;
7791 bpf_init_reuseport_kern(&reuse_kern
, reuse
, sk
, skb
, hash
);
7792 action
= BPF_PROG_RUN(prog
, &reuse_kern
);
7794 if (action
== SK_PASS
)
7795 return reuse_kern
.selected_sk
;
7797 return ERR_PTR(-ECONNREFUSED
);
7800 BPF_CALL_4(sk_select_reuseport
, struct sk_reuseport_kern
*, reuse_kern
,
7801 struct bpf_map
*, map
, void *, key
, u32
, flags
)
7803 struct sock_reuseport
*reuse
;
7804 struct sock
*selected_sk
;
7806 selected_sk
= map
->ops
->map_lookup_elem(map
, key
);
7810 reuse
= rcu_dereference(selected_sk
->sk_reuseport_cb
);
7812 /* selected_sk is unhashed (e.g. by close()) after the
7813 * above map_lookup_elem(). Treat selected_sk has already
7814 * been removed from the map.
7818 if (unlikely(reuse
->reuseport_id
!= reuse_kern
->reuseport_id
)) {
7821 if (unlikely(!reuse_kern
->reuseport_id
))
7822 /* There is a small race between adding the
7823 * sk to the map and setting the
7824 * reuse_kern->reuseport_id.
7825 * Treat it as the sk has not been added to
7830 sk
= reuse_kern
->sk
;
7831 if (sk
->sk_protocol
!= selected_sk
->sk_protocol
)
7833 else if (sk
->sk_family
!= selected_sk
->sk_family
)
7834 return -EAFNOSUPPORT
;
7836 /* Catch all. Likely bound to a different sockaddr. */
7840 reuse_kern
->selected_sk
= selected_sk
;
7845 static const struct bpf_func_proto sk_select_reuseport_proto
= {
7846 .func
= sk_select_reuseport
,
7848 .ret_type
= RET_INTEGER
,
7849 .arg1_type
= ARG_PTR_TO_CTX
,
7850 .arg2_type
= ARG_CONST_MAP_PTR
,
7851 .arg3_type
= ARG_PTR_TO_MAP_KEY
,
7852 .arg4_type
= ARG_ANYTHING
,
7855 BPF_CALL_4(sk_reuseport_load_bytes
,
7856 const struct sk_reuseport_kern
*, reuse_kern
, u32
, offset
,
7857 void *, to
, u32
, len
)
7859 return ____bpf_skb_load_bytes(reuse_kern
->skb
, offset
, to
, len
);
7862 static const struct bpf_func_proto sk_reuseport_load_bytes_proto
= {
7863 .func
= sk_reuseport_load_bytes
,
7865 .ret_type
= RET_INTEGER
,
7866 .arg1_type
= ARG_PTR_TO_CTX
,
7867 .arg2_type
= ARG_ANYTHING
,
7868 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
7869 .arg4_type
= ARG_CONST_SIZE
,
7872 BPF_CALL_5(sk_reuseport_load_bytes_relative
,
7873 const struct sk_reuseport_kern
*, reuse_kern
, u32
, offset
,
7874 void *, to
, u32
, len
, u32
, start_header
)
7876 return ____bpf_skb_load_bytes_relative(reuse_kern
->skb
, offset
, to
,
7880 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto
= {
7881 .func
= sk_reuseport_load_bytes_relative
,
7883 .ret_type
= RET_INTEGER
,
7884 .arg1_type
= ARG_PTR_TO_CTX
,
7885 .arg2_type
= ARG_ANYTHING
,
7886 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
7887 .arg4_type
= ARG_CONST_SIZE
,
7888 .arg5_type
= ARG_ANYTHING
,
7891 static const struct bpf_func_proto
*
7892 sk_reuseport_func_proto(enum bpf_func_id func_id
,
7893 const struct bpf_prog
*prog
)
7896 case BPF_FUNC_sk_select_reuseport
:
7897 return &sk_select_reuseport_proto
;
7898 case BPF_FUNC_skb_load_bytes
:
7899 return &sk_reuseport_load_bytes_proto
;
7900 case BPF_FUNC_skb_load_bytes_relative
:
7901 return &sk_reuseport_load_bytes_relative_proto
;
7903 return bpf_base_func_proto(func_id
);
7908 sk_reuseport_is_valid_access(int off
, int size
,
7909 enum bpf_access_type type
,
7910 const struct bpf_prog
*prog
,
7911 struct bpf_insn_access_aux
*info
)
7913 const u32 size_default
= sizeof(__u32
);
7915 if (off
< 0 || off
>= sizeof(struct sk_reuseport_md
) ||
7916 off
% size
|| type
!= BPF_READ
)
7920 case offsetof(struct sk_reuseport_md
, data
):
7921 info
->reg_type
= PTR_TO_PACKET
;
7922 return size
== sizeof(__u64
);
7924 case offsetof(struct sk_reuseport_md
, data_end
):
7925 info
->reg_type
= PTR_TO_PACKET_END
;
7926 return size
== sizeof(__u64
);
7928 case offsetof(struct sk_reuseport_md
, hash
):
7929 return size
== size_default
;
7931 /* Fields that allow narrowing */
7932 case offsetof(struct sk_reuseport_md
, eth_protocol
):
7933 if (size
< FIELD_SIZEOF(struct sk_buff
, protocol
))
7936 case offsetof(struct sk_reuseport_md
, ip_protocol
):
7937 case offsetof(struct sk_reuseport_md
, bind_inany
):
7938 case offsetof(struct sk_reuseport_md
, len
):
7939 bpf_ctx_record_field_size(info
, size_default
);
7940 return bpf_ctx_narrow_access_ok(off
, size
, size_default
);
7947 #define SK_REUSEPORT_LOAD_FIELD(F) ({ \
7948 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \
7949 si->dst_reg, si->src_reg, \
7950 bpf_target_off(struct sk_reuseport_kern, F, \
7951 FIELD_SIZEOF(struct sk_reuseport_kern, F), \
7955 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \
7956 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \
7961 #define SK_REUSEPORT_LOAD_SK_FIELD_SIZE_OFF(SK_FIELD, BPF_SIZE, EXTRA_OFF) \
7962 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(struct sk_reuseport_kern, \
7965 SK_FIELD, BPF_SIZE, EXTRA_OFF)
7967 static u32
sk_reuseport_convert_ctx_access(enum bpf_access_type type
,
7968 const struct bpf_insn
*si
,
7969 struct bpf_insn
*insn_buf
,
7970 struct bpf_prog
*prog
,
7973 struct bpf_insn
*insn
= insn_buf
;
7976 case offsetof(struct sk_reuseport_md
, data
):
7977 SK_REUSEPORT_LOAD_SKB_FIELD(data
);
7980 case offsetof(struct sk_reuseport_md
, len
):
7981 SK_REUSEPORT_LOAD_SKB_FIELD(len
);
7984 case offsetof(struct sk_reuseport_md
, eth_protocol
):
7985 SK_REUSEPORT_LOAD_SKB_FIELD(protocol
);
7988 case offsetof(struct sk_reuseport_md
, ip_protocol
):
7989 BUILD_BUG_ON(HWEIGHT32(SK_FL_PROTO_MASK
) != BITS_PER_BYTE
);
7990 SK_REUSEPORT_LOAD_SK_FIELD_SIZE_OFF(__sk_flags_offset
,
7992 *insn
++ = BPF_ALU32_IMM(BPF_AND
, si
->dst_reg
, SK_FL_PROTO_MASK
);
7993 *insn
++ = BPF_ALU32_IMM(BPF_RSH
, si
->dst_reg
,
7995 /* SK_FL_PROTO_MASK and SK_FL_PROTO_SHIFT are endian
7996 * aware. No further narrowing or masking is needed.
8001 case offsetof(struct sk_reuseport_md
, data_end
):
8002 SK_REUSEPORT_LOAD_FIELD(data_end
);
8005 case offsetof(struct sk_reuseport_md
, hash
):
8006 SK_REUSEPORT_LOAD_FIELD(hash
);
8009 case offsetof(struct sk_reuseport_md
, bind_inany
):
8010 SK_REUSEPORT_LOAD_FIELD(bind_inany
);
8014 return insn
- insn_buf
;
8017 const struct bpf_verifier_ops sk_reuseport_verifier_ops
= {
8018 .get_func_proto
= sk_reuseport_func_proto
,
8019 .is_valid_access
= sk_reuseport_is_valid_access
,
8020 .convert_ctx_access
= sk_reuseport_convert_ctx_access
,
8023 const struct bpf_prog_ops sk_reuseport_prog_ops
= {
8025 #endif /* CONFIG_INET */