1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Linux Socket Filter - Kernel level socket filtering
5 * Based on the design of the Berkeley Packet Filter. The new
6 * internal format has been designed by PLUMgrid:
8 * Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com
12 * Jay Schulist <jschlst@samba.org>
13 * Alexei Starovoitov <ast@plumgrid.com>
14 * Daniel Borkmann <dborkman@redhat.com>
16 * Andi Kleen - Fix a few bad bugs and races.
17 * Kris Katterjohn - Added many additional checks in bpf_check_classic()
20 #include <linux/atomic.h>
21 #include <linux/bpf_verifier.h>
22 #include <linux/module.h>
23 #include <linux/types.h>
25 #include <linux/fcntl.h>
26 #include <linux/socket.h>
27 #include <linux/sock_diag.h>
29 #include <linux/inet.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_packet.h>
32 #include <linux/if_arp.h>
33 #include <linux/gfp.h>
34 #include <net/inet_common.h>
36 #include <net/protocol.h>
37 #include <net/netlink.h>
38 #include <linux/skbuff.h>
39 #include <linux/skmsg.h>
41 #include <net/flow_dissector.h>
42 #include <linux/errno.h>
43 #include <linux/timer.h>
44 #include <linux/uaccess.h>
45 #include <asm/unaligned.h>
46 #include <linux/filter.h>
47 #include <linux/ratelimit.h>
48 #include <linux/seccomp.h>
49 #include <linux/if_vlan.h>
50 #include <linux/bpf.h>
51 #include <linux/btf.h>
52 #include <net/sch_generic.h>
53 #include <net/cls_cgroup.h>
54 #include <net/dst_metadata.h>
56 #include <net/sock_reuseport.h>
57 #include <net/busy_poll.h>
61 #include <linux/bpf_trace.h>
62 #include <net/xdp_sock.h>
63 #include <linux/inetdevice.h>
64 #include <net/inet_hashtables.h>
65 #include <net/inet6_hashtables.h>
66 #include <net/ip_fib.h>
67 #include <net/nexthop.h>
71 #include <net/net_namespace.h>
72 #include <linux/seg6_local.h>
74 #include <net/seg6_local.h>
75 #include <net/lwtunnel.h>
76 #include <net/ipv6_stubs.h>
77 #include <net/bpf_sk_storage.h>
78 #include <net/transp_v6.h>
79 #include <linux/btf_ids.h>
82 #include <net/mptcp.h>
83 #include <net/netfilter/nf_conntrack_bpf.h>
84 #include <net/netkit.h>
86 #include <net/xdp_sock_drv.h>
90 static const struct bpf_func_proto
*
91 bpf_sk_base_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
);
93 int copy_bpf_fprog_from_user(struct sock_fprog
*dst
, sockptr_t src
, int len
)
95 if (in_compat_syscall()) {
96 struct compat_sock_fprog f32
;
98 if (len
!= sizeof(f32
))
100 if (copy_from_sockptr(&f32
, src
, sizeof(f32
)))
102 memset(dst
, 0, sizeof(*dst
));
104 dst
->filter
= compat_ptr(f32
.filter
);
106 if (len
!= sizeof(*dst
))
108 if (copy_from_sockptr(dst
, src
, sizeof(*dst
)))
114 EXPORT_SYMBOL_GPL(copy_bpf_fprog_from_user
);
117 * sk_filter_trim_cap - run a packet through a socket filter
118 * @sk: sock associated with &sk_buff
119 * @skb: buffer to filter
120 * @cap: limit on how short the eBPF program may trim the packet
122 * Run the eBPF program and then cut skb->data to correct size returned by
123 * the program. If pkt_len is 0 we toss packet. If skb->len is smaller
124 * than pkt_len we keep whole skb->data. This is the socket level
125 * wrapper to bpf_prog_run. It returns 0 if the packet should
126 * be accepted or -EPERM if the packet should be tossed.
129 int sk_filter_trim_cap(struct sock
*sk
, struct sk_buff
*skb
, unsigned int cap
)
132 struct sk_filter
*filter
;
135 * If the skb was allocated from pfmemalloc reserves, only
136 * allow SOCK_MEMALLOC sockets to use it as this socket is
137 * helping free memory
139 if (skb_pfmemalloc(skb
) && !sock_flag(sk
, SOCK_MEMALLOC
)) {
140 NET_INC_STATS(sock_net(sk
), LINUX_MIB_PFMEMALLOCDROP
);
143 err
= BPF_CGROUP_RUN_PROG_INET_INGRESS(sk
, skb
);
147 err
= security_sock_rcv_skb(sk
, skb
);
152 filter
= rcu_dereference(sk
->sk_filter
);
154 struct sock
*save_sk
= skb
->sk
;
155 unsigned int pkt_len
;
158 pkt_len
= bpf_prog_run_save_cb(filter
->prog
, skb
);
160 err
= pkt_len
? pskb_trim(skb
, max(cap
, pkt_len
)) : -EPERM
;
166 EXPORT_SYMBOL(sk_filter_trim_cap
);
168 BPF_CALL_1(bpf_skb_get_pay_offset
, struct sk_buff
*, skb
)
170 return skb_get_poff(skb
);
173 BPF_CALL_3(bpf_skb_get_nlattr
, struct sk_buff
*, skb
, u32
, a
, u32
, x
)
177 if (skb_is_nonlinear(skb
))
180 if (skb
->len
< sizeof(struct nlattr
))
183 if (a
> skb
->len
- sizeof(struct nlattr
))
186 nla
= nla_find((struct nlattr
*) &skb
->data
[a
], skb
->len
- a
, x
);
188 return (void *) nla
- (void *) skb
->data
;
193 BPF_CALL_3(bpf_skb_get_nlattr_nest
, struct sk_buff
*, skb
, u32
, a
, u32
, x
)
197 if (skb_is_nonlinear(skb
))
200 if (skb
->len
< sizeof(struct nlattr
))
203 if (a
> skb
->len
- sizeof(struct nlattr
))
206 nla
= (struct nlattr
*) &skb
->data
[a
];
207 if (!nla_ok(nla
, skb
->len
- a
))
210 nla
= nla_find_nested(nla
, x
);
212 return (void *) nla
- (void *) skb
->data
;
217 BPF_CALL_4(bpf_skb_load_helper_8
, const struct sk_buff
*, skb
, const void *,
218 data
, int, headlen
, int, offset
)
221 const int len
= sizeof(tmp
);
224 if (headlen
- offset
>= len
)
225 return *(u8
*)(data
+ offset
);
226 if (!skb_copy_bits(skb
, offset
, &tmp
, sizeof(tmp
)))
229 ptr
= bpf_internal_load_pointer_neg_helper(skb
, offset
, len
);
237 BPF_CALL_2(bpf_skb_load_helper_8_no_cache
, const struct sk_buff
*, skb
,
240 return ____bpf_skb_load_helper_8(skb
, skb
->data
, skb
->len
- skb
->data_len
,
244 BPF_CALL_4(bpf_skb_load_helper_16
, const struct sk_buff
*, skb
, const void *,
245 data
, int, headlen
, int, offset
)
248 const int len
= sizeof(tmp
);
251 if (headlen
- offset
>= len
)
252 return get_unaligned_be16(data
+ offset
);
253 if (!skb_copy_bits(skb
, offset
, &tmp
, sizeof(tmp
)))
254 return be16_to_cpu(tmp
);
256 ptr
= bpf_internal_load_pointer_neg_helper(skb
, offset
, len
);
258 return get_unaligned_be16(ptr
);
264 BPF_CALL_2(bpf_skb_load_helper_16_no_cache
, const struct sk_buff
*, skb
,
267 return ____bpf_skb_load_helper_16(skb
, skb
->data
, skb
->len
- skb
->data_len
,
271 BPF_CALL_4(bpf_skb_load_helper_32
, const struct sk_buff
*, skb
, const void *,
272 data
, int, headlen
, int, offset
)
275 const int len
= sizeof(tmp
);
277 if (likely(offset
>= 0)) {
278 if (headlen
- offset
>= len
)
279 return get_unaligned_be32(data
+ offset
);
280 if (!skb_copy_bits(skb
, offset
, &tmp
, sizeof(tmp
)))
281 return be32_to_cpu(tmp
);
283 ptr
= bpf_internal_load_pointer_neg_helper(skb
, offset
, len
);
285 return get_unaligned_be32(ptr
);
291 BPF_CALL_2(bpf_skb_load_helper_32_no_cache
, const struct sk_buff
*, skb
,
294 return ____bpf_skb_load_helper_32(skb
, skb
->data
, skb
->len
- skb
->data_len
,
298 static u32
convert_skb_access(int skb_field
, int dst_reg
, int src_reg
,
299 struct bpf_insn
*insn_buf
)
301 struct bpf_insn
*insn
= insn_buf
;
305 BUILD_BUG_ON(sizeof_field(struct sk_buff
, mark
) != 4);
307 *insn
++ = BPF_LDX_MEM(BPF_W
, dst_reg
, src_reg
,
308 offsetof(struct sk_buff
, mark
));
312 *insn
++ = BPF_LDX_MEM(BPF_B
, dst_reg
, src_reg
, PKT_TYPE_OFFSET
);
313 *insn
++ = BPF_ALU32_IMM(BPF_AND
, dst_reg
, PKT_TYPE_MAX
);
314 #ifdef __BIG_ENDIAN_BITFIELD
315 *insn
++ = BPF_ALU32_IMM(BPF_RSH
, dst_reg
, 5);
320 BUILD_BUG_ON(sizeof_field(struct sk_buff
, queue_mapping
) != 2);
322 *insn
++ = BPF_LDX_MEM(BPF_H
, dst_reg
, src_reg
,
323 offsetof(struct sk_buff
, queue_mapping
));
326 case SKF_AD_VLAN_TAG
:
327 BUILD_BUG_ON(sizeof_field(struct sk_buff
, vlan_tci
) != 2);
329 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */
330 *insn
++ = BPF_LDX_MEM(BPF_H
, dst_reg
, src_reg
,
331 offsetof(struct sk_buff
, vlan_tci
));
333 case SKF_AD_VLAN_TAG_PRESENT
:
334 BUILD_BUG_ON(sizeof_field(struct sk_buff
, vlan_all
) != 4);
335 *insn
++ = BPF_LDX_MEM(BPF_W
, dst_reg
, src_reg
,
336 offsetof(struct sk_buff
, vlan_all
));
337 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, dst_reg
, 0, 1);
338 *insn
++ = BPF_ALU32_IMM(BPF_MOV
, dst_reg
, 1);
342 return insn
- insn_buf
;
345 static bool convert_bpf_extensions(struct sock_filter
*fp
,
346 struct bpf_insn
**insnp
)
348 struct bpf_insn
*insn
= *insnp
;
352 case SKF_AD_OFF
+ SKF_AD_PROTOCOL
:
353 BUILD_BUG_ON(sizeof_field(struct sk_buff
, protocol
) != 2);
355 /* A = *(u16 *) (CTX + offsetof(protocol)) */
356 *insn
++ = BPF_LDX_MEM(BPF_H
, BPF_REG_A
, BPF_REG_CTX
,
357 offsetof(struct sk_buff
, protocol
));
358 /* A = ntohs(A) [emitting a nop or swap16] */
359 *insn
= BPF_ENDIAN(BPF_FROM_BE
, BPF_REG_A
, 16);
362 case SKF_AD_OFF
+ SKF_AD_PKTTYPE
:
363 cnt
= convert_skb_access(SKF_AD_PKTTYPE
, BPF_REG_A
, BPF_REG_CTX
, insn
);
367 case SKF_AD_OFF
+ SKF_AD_IFINDEX
:
368 case SKF_AD_OFF
+ SKF_AD_HATYPE
:
369 BUILD_BUG_ON(sizeof_field(struct net_device
, ifindex
) != 4);
370 BUILD_BUG_ON(sizeof_field(struct net_device
, type
) != 2);
372 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, dev
),
373 BPF_REG_TMP
, BPF_REG_CTX
,
374 offsetof(struct sk_buff
, dev
));
375 /* if (tmp != 0) goto pc + 1 */
376 *insn
++ = BPF_JMP_IMM(BPF_JNE
, BPF_REG_TMP
, 0, 1);
377 *insn
++ = BPF_EXIT_INSN();
378 if (fp
->k
== SKF_AD_OFF
+ SKF_AD_IFINDEX
)
379 *insn
= BPF_LDX_MEM(BPF_W
, BPF_REG_A
, BPF_REG_TMP
,
380 offsetof(struct net_device
, ifindex
));
382 *insn
= BPF_LDX_MEM(BPF_H
, BPF_REG_A
, BPF_REG_TMP
,
383 offsetof(struct net_device
, type
));
386 case SKF_AD_OFF
+ SKF_AD_MARK
:
387 cnt
= convert_skb_access(SKF_AD_MARK
, BPF_REG_A
, BPF_REG_CTX
, insn
);
391 case SKF_AD_OFF
+ SKF_AD_RXHASH
:
392 BUILD_BUG_ON(sizeof_field(struct sk_buff
, hash
) != 4);
394 *insn
= BPF_LDX_MEM(BPF_W
, BPF_REG_A
, BPF_REG_CTX
,
395 offsetof(struct sk_buff
, hash
));
398 case SKF_AD_OFF
+ SKF_AD_QUEUE
:
399 cnt
= convert_skb_access(SKF_AD_QUEUE
, BPF_REG_A
, BPF_REG_CTX
, insn
);
403 case SKF_AD_OFF
+ SKF_AD_VLAN_TAG
:
404 cnt
= convert_skb_access(SKF_AD_VLAN_TAG
,
405 BPF_REG_A
, BPF_REG_CTX
, insn
);
409 case SKF_AD_OFF
+ SKF_AD_VLAN_TAG_PRESENT
:
410 cnt
= convert_skb_access(SKF_AD_VLAN_TAG_PRESENT
,
411 BPF_REG_A
, BPF_REG_CTX
, insn
);
415 case SKF_AD_OFF
+ SKF_AD_VLAN_TPID
:
416 BUILD_BUG_ON(sizeof_field(struct sk_buff
, vlan_proto
) != 2);
418 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */
419 *insn
++ = BPF_LDX_MEM(BPF_H
, BPF_REG_A
, BPF_REG_CTX
,
420 offsetof(struct sk_buff
, vlan_proto
));
421 /* A = ntohs(A) [emitting a nop or swap16] */
422 *insn
= BPF_ENDIAN(BPF_FROM_BE
, BPF_REG_A
, 16);
425 case SKF_AD_OFF
+ SKF_AD_PAY_OFFSET
:
426 case SKF_AD_OFF
+ SKF_AD_NLATTR
:
427 case SKF_AD_OFF
+ SKF_AD_NLATTR_NEST
:
428 case SKF_AD_OFF
+ SKF_AD_CPU
:
429 case SKF_AD_OFF
+ SKF_AD_RANDOM
:
431 *insn
++ = BPF_MOV64_REG(BPF_REG_ARG1
, BPF_REG_CTX
);
433 *insn
++ = BPF_MOV64_REG(BPF_REG_ARG2
, BPF_REG_A
);
435 *insn
++ = BPF_MOV64_REG(BPF_REG_ARG3
, BPF_REG_X
);
436 /* Emit call(arg1=CTX, arg2=A, arg3=X) */
438 case SKF_AD_OFF
+ SKF_AD_PAY_OFFSET
:
439 *insn
= BPF_EMIT_CALL(bpf_skb_get_pay_offset
);
441 case SKF_AD_OFF
+ SKF_AD_NLATTR
:
442 *insn
= BPF_EMIT_CALL(bpf_skb_get_nlattr
);
444 case SKF_AD_OFF
+ SKF_AD_NLATTR_NEST
:
445 *insn
= BPF_EMIT_CALL(bpf_skb_get_nlattr_nest
);
447 case SKF_AD_OFF
+ SKF_AD_CPU
:
448 *insn
= BPF_EMIT_CALL(bpf_get_raw_cpu_id
);
450 case SKF_AD_OFF
+ SKF_AD_RANDOM
:
451 *insn
= BPF_EMIT_CALL(bpf_user_rnd_u32
);
452 bpf_user_rnd_init_once();
457 case SKF_AD_OFF
+ SKF_AD_ALU_XOR_X
:
459 *insn
= BPF_ALU32_REG(BPF_XOR
, BPF_REG_A
, BPF_REG_X
);
463 /* This is just a dummy call to avoid letting the compiler
464 * evict __bpf_call_base() as an optimization. Placed here
465 * where no-one bothers.
467 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0);
475 static bool convert_bpf_ld_abs(struct sock_filter
*fp
, struct bpf_insn
**insnp
)
477 const bool unaligned_ok
= IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
);
478 int size
= bpf_size_to_bytes(BPF_SIZE(fp
->code
));
479 bool endian
= BPF_SIZE(fp
->code
) == BPF_H
||
480 BPF_SIZE(fp
->code
) == BPF_W
;
481 bool indirect
= BPF_MODE(fp
->code
) == BPF_IND
;
482 const int ip_align
= NET_IP_ALIGN
;
483 struct bpf_insn
*insn
= *insnp
;
487 ((unaligned_ok
&& offset
>= 0) ||
488 (!unaligned_ok
&& offset
>= 0 &&
489 offset
+ ip_align
>= 0 &&
490 offset
+ ip_align
% size
== 0))) {
491 bool ldx_off_ok
= offset
<= S16_MAX
;
493 *insn
++ = BPF_MOV64_REG(BPF_REG_TMP
, BPF_REG_H
);
495 *insn
++ = BPF_ALU64_IMM(BPF_SUB
, BPF_REG_TMP
, offset
);
496 *insn
++ = BPF_JMP_IMM(BPF_JSLT
, BPF_REG_TMP
,
497 size
, 2 + endian
+ (!ldx_off_ok
* 2));
499 *insn
++ = BPF_LDX_MEM(BPF_SIZE(fp
->code
), BPF_REG_A
,
502 *insn
++ = BPF_MOV64_REG(BPF_REG_TMP
, BPF_REG_D
);
503 *insn
++ = BPF_ALU64_IMM(BPF_ADD
, BPF_REG_TMP
, offset
);
504 *insn
++ = BPF_LDX_MEM(BPF_SIZE(fp
->code
), BPF_REG_A
,
508 *insn
++ = BPF_ENDIAN(BPF_FROM_BE
, BPF_REG_A
, size
* 8);
509 *insn
++ = BPF_JMP_A(8);
512 *insn
++ = BPF_MOV64_REG(BPF_REG_ARG1
, BPF_REG_CTX
);
513 *insn
++ = BPF_MOV64_REG(BPF_REG_ARG2
, BPF_REG_D
);
514 *insn
++ = BPF_MOV64_REG(BPF_REG_ARG3
, BPF_REG_H
);
516 *insn
++ = BPF_MOV64_IMM(BPF_REG_ARG4
, offset
);
518 *insn
++ = BPF_MOV64_REG(BPF_REG_ARG4
, BPF_REG_X
);
520 *insn
++ = BPF_ALU64_IMM(BPF_ADD
, BPF_REG_ARG4
, offset
);
523 switch (BPF_SIZE(fp
->code
)) {
525 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_8
);
528 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_16
);
531 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_32
);
537 *insn
++ = BPF_JMP_IMM(BPF_JSGE
, BPF_REG_A
, 0, 2);
538 *insn
++ = BPF_ALU32_REG(BPF_XOR
, BPF_REG_A
, BPF_REG_A
);
539 *insn
= BPF_EXIT_INSN();
546 * bpf_convert_filter - convert filter program
547 * @prog: the user passed filter program
548 * @len: the length of the user passed filter program
549 * @new_prog: allocated 'struct bpf_prog' or NULL
550 * @new_len: pointer to store length of converted program
551 * @seen_ld_abs: bool whether we've seen ld_abs/ind
553 * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn'
554 * style extended BPF (eBPF).
555 * Conversion workflow:
557 * 1) First pass for calculating the new program length:
558 * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs)
560 * 2) 2nd pass to remap in two passes: 1st pass finds new
561 * jump offsets, 2nd pass remapping:
562 * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs)
564 static int bpf_convert_filter(struct sock_filter
*prog
, int len
,
565 struct bpf_prog
*new_prog
, int *new_len
,
568 int new_flen
= 0, pass
= 0, target
, i
, stack_off
;
569 struct bpf_insn
*new_insn
, *first_insn
= NULL
;
570 struct sock_filter
*fp
;
574 BUILD_BUG_ON(BPF_MEMWORDS
* sizeof(u32
) > MAX_BPF_STACK
);
575 BUILD_BUG_ON(BPF_REG_FP
+ 1 != MAX_BPF_REG
);
577 if (len
<= 0 || len
> BPF_MAXINSNS
)
581 first_insn
= new_prog
->insnsi
;
582 addrs
= kcalloc(len
, sizeof(*addrs
),
583 GFP_KERNEL
| __GFP_NOWARN
);
589 new_insn
= first_insn
;
592 /* Classic BPF related prologue emission. */
594 /* Classic BPF expects A and X to be reset first. These need
595 * to be guaranteed to be the first two instructions.
597 *new_insn
++ = BPF_ALU32_REG(BPF_XOR
, BPF_REG_A
, BPF_REG_A
);
598 *new_insn
++ = BPF_ALU32_REG(BPF_XOR
, BPF_REG_X
, BPF_REG_X
);
600 /* All programs must keep CTX in callee saved BPF_REG_CTX.
601 * In eBPF case it's done by the compiler, here we need to
602 * do this ourself. Initial CTX is present in BPF_REG_ARG1.
604 *new_insn
++ = BPF_MOV64_REG(BPF_REG_CTX
, BPF_REG_ARG1
);
606 /* For packet access in classic BPF, cache skb->data
607 * in callee-saved BPF R8 and skb->len - skb->data_len
608 * (headlen) in BPF R9. Since classic BPF is read-only
609 * on CTX, we only need to cache it once.
611 *new_insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, data
),
612 BPF_REG_D
, BPF_REG_CTX
,
613 offsetof(struct sk_buff
, data
));
614 *new_insn
++ = BPF_LDX_MEM(BPF_W
, BPF_REG_H
, BPF_REG_CTX
,
615 offsetof(struct sk_buff
, len
));
616 *new_insn
++ = BPF_LDX_MEM(BPF_W
, BPF_REG_TMP
, BPF_REG_CTX
,
617 offsetof(struct sk_buff
, data_len
));
618 *new_insn
++ = BPF_ALU32_REG(BPF_SUB
, BPF_REG_H
, BPF_REG_TMP
);
624 for (i
= 0; i
< len
; fp
++, i
++) {
625 struct bpf_insn tmp_insns
[32] = { };
626 struct bpf_insn
*insn
= tmp_insns
;
629 addrs
[i
] = new_insn
- first_insn
;
632 /* All arithmetic insns and skb loads map as-is. */
633 case BPF_ALU
| BPF_ADD
| BPF_X
:
634 case BPF_ALU
| BPF_ADD
| BPF_K
:
635 case BPF_ALU
| BPF_SUB
| BPF_X
:
636 case BPF_ALU
| BPF_SUB
| BPF_K
:
637 case BPF_ALU
| BPF_AND
| BPF_X
:
638 case BPF_ALU
| BPF_AND
| BPF_K
:
639 case BPF_ALU
| BPF_OR
| BPF_X
:
640 case BPF_ALU
| BPF_OR
| BPF_K
:
641 case BPF_ALU
| BPF_LSH
| BPF_X
:
642 case BPF_ALU
| BPF_LSH
| BPF_K
:
643 case BPF_ALU
| BPF_RSH
| BPF_X
:
644 case BPF_ALU
| BPF_RSH
| BPF_K
:
645 case BPF_ALU
| BPF_XOR
| BPF_X
:
646 case BPF_ALU
| BPF_XOR
| BPF_K
:
647 case BPF_ALU
| BPF_MUL
| BPF_X
:
648 case BPF_ALU
| BPF_MUL
| BPF_K
:
649 case BPF_ALU
| BPF_DIV
| BPF_X
:
650 case BPF_ALU
| BPF_DIV
| BPF_K
:
651 case BPF_ALU
| BPF_MOD
| BPF_X
:
652 case BPF_ALU
| BPF_MOD
| BPF_K
:
653 case BPF_ALU
| BPF_NEG
:
654 case BPF_LD
| BPF_ABS
| BPF_W
:
655 case BPF_LD
| BPF_ABS
| BPF_H
:
656 case BPF_LD
| BPF_ABS
| BPF_B
:
657 case BPF_LD
| BPF_IND
| BPF_W
:
658 case BPF_LD
| BPF_IND
| BPF_H
:
659 case BPF_LD
| BPF_IND
| BPF_B
:
660 /* Check for overloaded BPF extension and
661 * directly convert it if found, otherwise
662 * just move on with mapping.
664 if (BPF_CLASS(fp
->code
) == BPF_LD
&&
665 BPF_MODE(fp
->code
) == BPF_ABS
&&
666 convert_bpf_extensions(fp
, &insn
))
668 if (BPF_CLASS(fp
->code
) == BPF_LD
&&
669 convert_bpf_ld_abs(fp
, &insn
)) {
674 if (fp
->code
== (BPF_ALU
| BPF_DIV
| BPF_X
) ||
675 fp
->code
== (BPF_ALU
| BPF_MOD
| BPF_X
)) {
676 *insn
++ = BPF_MOV32_REG(BPF_REG_X
, BPF_REG_X
);
677 /* Error with exception code on div/mod by 0.
678 * For cBPF programs, this was always return 0.
680 *insn
++ = BPF_JMP_IMM(BPF_JNE
, BPF_REG_X
, 0, 2);
681 *insn
++ = BPF_ALU32_REG(BPF_XOR
, BPF_REG_A
, BPF_REG_A
);
682 *insn
++ = BPF_EXIT_INSN();
685 *insn
= BPF_RAW_INSN(fp
->code
, BPF_REG_A
, BPF_REG_X
, 0, fp
->k
);
688 /* Jump transformation cannot use BPF block macros
689 * everywhere as offset calculation and target updates
690 * require a bit more work than the rest, i.e. jump
691 * opcodes map as-is, but offsets need adjustment.
694 #define BPF_EMIT_JMP \
696 const s32 off_min = S16_MIN, off_max = S16_MAX; \
699 if (target >= len || target < 0) \
701 off = addrs ? addrs[target] - addrs[i] - 1 : 0; \
702 /* Adjust pc relative offset for 2nd or 3rd insn. */ \
703 off -= insn - tmp_insns; \
704 /* Reject anything not fitting into insn->off. */ \
705 if (off < off_min || off > off_max) \
710 case BPF_JMP
| BPF_JA
:
711 target
= i
+ fp
->k
+ 1;
712 insn
->code
= fp
->code
;
716 case BPF_JMP
| BPF_JEQ
| BPF_K
:
717 case BPF_JMP
| BPF_JEQ
| BPF_X
:
718 case BPF_JMP
| BPF_JSET
| BPF_K
:
719 case BPF_JMP
| BPF_JSET
| BPF_X
:
720 case BPF_JMP
| BPF_JGT
| BPF_K
:
721 case BPF_JMP
| BPF_JGT
| BPF_X
:
722 case BPF_JMP
| BPF_JGE
| BPF_K
:
723 case BPF_JMP
| BPF_JGE
| BPF_X
:
724 if (BPF_SRC(fp
->code
) == BPF_K
&& (int) fp
->k
< 0) {
725 /* BPF immediates are signed, zero extend
726 * immediate into tmp register and use it
729 *insn
++ = BPF_MOV32_IMM(BPF_REG_TMP
, fp
->k
);
731 insn
->dst_reg
= BPF_REG_A
;
732 insn
->src_reg
= BPF_REG_TMP
;
735 insn
->dst_reg
= BPF_REG_A
;
737 bpf_src
= BPF_SRC(fp
->code
);
738 insn
->src_reg
= bpf_src
== BPF_X
? BPF_REG_X
: 0;
741 /* Common case where 'jump_false' is next insn. */
743 insn
->code
= BPF_JMP
| BPF_OP(fp
->code
) | bpf_src
;
744 target
= i
+ fp
->jt
+ 1;
749 /* Convert some jumps when 'jump_true' is next insn. */
751 switch (BPF_OP(fp
->code
)) {
753 insn
->code
= BPF_JMP
| BPF_JNE
| bpf_src
;
756 insn
->code
= BPF_JMP
| BPF_JLE
| bpf_src
;
759 insn
->code
= BPF_JMP
| BPF_JLT
| bpf_src
;
765 target
= i
+ fp
->jf
+ 1;
770 /* Other jumps are mapped into two insns: Jxx and JA. */
771 target
= i
+ fp
->jt
+ 1;
772 insn
->code
= BPF_JMP
| BPF_OP(fp
->code
) | bpf_src
;
776 insn
->code
= BPF_JMP
| BPF_JA
;
777 target
= i
+ fp
->jf
+ 1;
781 /* ldxb 4 * ([14] & 0xf) is remapped into 6 insns. */
782 case BPF_LDX
| BPF_MSH
| BPF_B
: {
783 struct sock_filter tmp
= {
784 .code
= BPF_LD
| BPF_ABS
| BPF_B
,
791 *insn
++ = BPF_MOV64_REG(BPF_REG_X
, BPF_REG_A
);
792 /* A = BPF_R0 = *(u8 *) (skb->data + K) */
793 convert_bpf_ld_abs(&tmp
, &insn
);
796 *insn
++ = BPF_ALU32_IMM(BPF_AND
, BPF_REG_A
, 0xf);
798 *insn
++ = BPF_ALU32_IMM(BPF_LSH
, BPF_REG_A
, 2);
800 *insn
++ = BPF_MOV64_REG(BPF_REG_TMP
, BPF_REG_X
);
802 *insn
++ = BPF_MOV64_REG(BPF_REG_X
, BPF_REG_A
);
804 *insn
= BPF_MOV64_REG(BPF_REG_A
, BPF_REG_TMP
);
807 /* RET_K is remapped into 2 insns. RET_A case doesn't need an
808 * extra mov as BPF_REG_0 is already mapped into BPF_REG_A.
810 case BPF_RET
| BPF_A
:
811 case BPF_RET
| BPF_K
:
812 if (BPF_RVAL(fp
->code
) == BPF_K
)
813 *insn
++ = BPF_MOV32_RAW(BPF_K
, BPF_REG_0
,
815 *insn
= BPF_EXIT_INSN();
818 /* Store to stack. */
821 stack_off
= fp
->k
* 4 + 4;
822 *insn
= BPF_STX_MEM(BPF_W
, BPF_REG_FP
, BPF_CLASS(fp
->code
) ==
823 BPF_ST
? BPF_REG_A
: BPF_REG_X
,
825 /* check_load_and_stores() verifies that classic BPF can
826 * load from stack only after write, so tracking
827 * stack_depth for ST|STX insns is enough
829 if (new_prog
&& new_prog
->aux
->stack_depth
< stack_off
)
830 new_prog
->aux
->stack_depth
= stack_off
;
833 /* Load from stack. */
834 case BPF_LD
| BPF_MEM
:
835 case BPF_LDX
| BPF_MEM
:
836 stack_off
= fp
->k
* 4 + 4;
837 *insn
= BPF_LDX_MEM(BPF_W
, BPF_CLASS(fp
->code
) == BPF_LD
?
838 BPF_REG_A
: BPF_REG_X
, BPF_REG_FP
,
843 case BPF_LD
| BPF_IMM
:
844 case BPF_LDX
| BPF_IMM
:
845 *insn
= BPF_MOV32_IMM(BPF_CLASS(fp
->code
) == BPF_LD
?
846 BPF_REG_A
: BPF_REG_X
, fp
->k
);
850 case BPF_MISC
| BPF_TAX
:
851 *insn
= BPF_MOV64_REG(BPF_REG_X
, BPF_REG_A
);
855 case BPF_MISC
| BPF_TXA
:
856 *insn
= BPF_MOV64_REG(BPF_REG_A
, BPF_REG_X
);
859 /* A = skb->len or X = skb->len */
860 case BPF_LD
| BPF_W
| BPF_LEN
:
861 case BPF_LDX
| BPF_W
| BPF_LEN
:
862 *insn
= BPF_LDX_MEM(BPF_W
, BPF_CLASS(fp
->code
) == BPF_LD
?
863 BPF_REG_A
: BPF_REG_X
, BPF_REG_CTX
,
864 offsetof(struct sk_buff
, len
));
867 /* Access seccomp_data fields. */
868 case BPF_LDX
| BPF_ABS
| BPF_W
:
869 /* A = *(u32 *) (ctx + K) */
870 *insn
= BPF_LDX_MEM(BPF_W
, BPF_REG_A
, BPF_REG_CTX
, fp
->k
);
873 /* Unknown instruction. */
880 memcpy(new_insn
, tmp_insns
,
881 sizeof(*insn
) * (insn
- tmp_insns
));
882 new_insn
+= insn
- tmp_insns
;
886 /* Only calculating new length. */
887 *new_len
= new_insn
- first_insn
;
889 *new_len
+= 4; /* Prologue bits. */
894 if (new_flen
!= new_insn
- first_insn
) {
895 new_flen
= new_insn
- first_insn
;
902 BUG_ON(*new_len
!= new_flen
);
911 * As we dont want to clear mem[] array for each packet going through
912 * __bpf_prog_run(), we check that filter loaded by user never try to read
913 * a cell if not previously written, and we check all branches to be sure
914 * a malicious user doesn't try to abuse us.
916 static int check_load_and_stores(const struct sock_filter
*filter
, int flen
)
918 u16
*masks
, memvalid
= 0; /* One bit per cell, 16 cells */
921 BUILD_BUG_ON(BPF_MEMWORDS
> 16);
923 masks
= kmalloc_array(flen
, sizeof(*masks
), GFP_KERNEL
);
927 memset(masks
, 0xff, flen
* sizeof(*masks
));
929 for (pc
= 0; pc
< flen
; pc
++) {
930 memvalid
&= masks
[pc
];
932 switch (filter
[pc
].code
) {
935 memvalid
|= (1 << filter
[pc
].k
);
937 case BPF_LD
| BPF_MEM
:
938 case BPF_LDX
| BPF_MEM
:
939 if (!(memvalid
& (1 << filter
[pc
].k
))) {
944 case BPF_JMP
| BPF_JA
:
945 /* A jump must set masks on target */
946 masks
[pc
+ 1 + filter
[pc
].k
] &= memvalid
;
949 case BPF_JMP
| BPF_JEQ
| BPF_K
:
950 case BPF_JMP
| BPF_JEQ
| BPF_X
:
951 case BPF_JMP
| BPF_JGE
| BPF_K
:
952 case BPF_JMP
| BPF_JGE
| BPF_X
:
953 case BPF_JMP
| BPF_JGT
| BPF_K
:
954 case BPF_JMP
| BPF_JGT
| BPF_X
:
955 case BPF_JMP
| BPF_JSET
| BPF_K
:
956 case BPF_JMP
| BPF_JSET
| BPF_X
:
957 /* A jump must set masks on targets */
958 masks
[pc
+ 1 + filter
[pc
].jt
] &= memvalid
;
959 masks
[pc
+ 1 + filter
[pc
].jf
] &= memvalid
;
969 static bool chk_code_allowed(u16 code_to_probe
)
971 static const bool codes
[] = {
972 /* 32 bit ALU operations */
973 [BPF_ALU
| BPF_ADD
| BPF_K
] = true,
974 [BPF_ALU
| BPF_ADD
| BPF_X
] = true,
975 [BPF_ALU
| BPF_SUB
| BPF_K
] = true,
976 [BPF_ALU
| BPF_SUB
| BPF_X
] = true,
977 [BPF_ALU
| BPF_MUL
| BPF_K
] = true,
978 [BPF_ALU
| BPF_MUL
| BPF_X
] = true,
979 [BPF_ALU
| BPF_DIV
| BPF_K
] = true,
980 [BPF_ALU
| BPF_DIV
| BPF_X
] = true,
981 [BPF_ALU
| BPF_MOD
| BPF_K
] = true,
982 [BPF_ALU
| BPF_MOD
| BPF_X
] = true,
983 [BPF_ALU
| BPF_AND
| BPF_K
] = true,
984 [BPF_ALU
| BPF_AND
| BPF_X
] = true,
985 [BPF_ALU
| BPF_OR
| BPF_K
] = true,
986 [BPF_ALU
| BPF_OR
| BPF_X
] = true,
987 [BPF_ALU
| BPF_XOR
| BPF_K
] = true,
988 [BPF_ALU
| BPF_XOR
| BPF_X
] = true,
989 [BPF_ALU
| BPF_LSH
| BPF_K
] = true,
990 [BPF_ALU
| BPF_LSH
| BPF_X
] = true,
991 [BPF_ALU
| BPF_RSH
| BPF_K
] = true,
992 [BPF_ALU
| BPF_RSH
| BPF_X
] = true,
993 [BPF_ALU
| BPF_NEG
] = true,
994 /* Load instructions */
995 [BPF_LD
| BPF_W
| BPF_ABS
] = true,
996 [BPF_LD
| BPF_H
| BPF_ABS
] = true,
997 [BPF_LD
| BPF_B
| BPF_ABS
] = true,
998 [BPF_LD
| BPF_W
| BPF_LEN
] = true,
999 [BPF_LD
| BPF_W
| BPF_IND
] = true,
1000 [BPF_LD
| BPF_H
| BPF_IND
] = true,
1001 [BPF_LD
| BPF_B
| BPF_IND
] = true,
1002 [BPF_LD
| BPF_IMM
] = true,
1003 [BPF_LD
| BPF_MEM
] = true,
1004 [BPF_LDX
| BPF_W
| BPF_LEN
] = true,
1005 [BPF_LDX
| BPF_B
| BPF_MSH
] = true,
1006 [BPF_LDX
| BPF_IMM
] = true,
1007 [BPF_LDX
| BPF_MEM
] = true,
1008 /* Store instructions */
1011 /* Misc instructions */
1012 [BPF_MISC
| BPF_TAX
] = true,
1013 [BPF_MISC
| BPF_TXA
] = true,
1014 /* Return instructions */
1015 [BPF_RET
| BPF_K
] = true,
1016 [BPF_RET
| BPF_A
] = true,
1017 /* Jump instructions */
1018 [BPF_JMP
| BPF_JA
] = true,
1019 [BPF_JMP
| BPF_JEQ
| BPF_K
] = true,
1020 [BPF_JMP
| BPF_JEQ
| BPF_X
] = true,
1021 [BPF_JMP
| BPF_JGE
| BPF_K
] = true,
1022 [BPF_JMP
| BPF_JGE
| BPF_X
] = true,
1023 [BPF_JMP
| BPF_JGT
| BPF_K
] = true,
1024 [BPF_JMP
| BPF_JGT
| BPF_X
] = true,
1025 [BPF_JMP
| BPF_JSET
| BPF_K
] = true,
1026 [BPF_JMP
| BPF_JSET
| BPF_X
] = true,
1029 if (code_to_probe
>= ARRAY_SIZE(codes
))
1032 return codes
[code_to_probe
];
1035 static bool bpf_check_basics_ok(const struct sock_filter
*filter
,
1040 if (flen
== 0 || flen
> BPF_MAXINSNS
)
1047 * bpf_check_classic - verify socket filter code
1048 * @filter: filter to verify
1049 * @flen: length of filter
1051 * Check the user's filter code. If we let some ugly
1052 * filter code slip through kaboom! The filter must contain
1053 * no references or jumps that are out of range, no illegal
1054 * instructions, and must end with a RET instruction.
1056 * All jumps are forward as they are not signed.
1058 * Returns 0 if the rule set is legal or -EINVAL if not.
1060 static int bpf_check_classic(const struct sock_filter
*filter
,
1066 /* Check the filter code now */
1067 for (pc
= 0; pc
< flen
; pc
++) {
1068 const struct sock_filter
*ftest
= &filter
[pc
];
1070 /* May we actually operate on this code? */
1071 if (!chk_code_allowed(ftest
->code
))
1074 /* Some instructions need special checks */
1075 switch (ftest
->code
) {
1076 case BPF_ALU
| BPF_DIV
| BPF_K
:
1077 case BPF_ALU
| BPF_MOD
| BPF_K
:
1078 /* Check for division by zero */
1082 case BPF_ALU
| BPF_LSH
| BPF_K
:
1083 case BPF_ALU
| BPF_RSH
| BPF_K
:
1087 case BPF_LD
| BPF_MEM
:
1088 case BPF_LDX
| BPF_MEM
:
1091 /* Check for invalid memory addresses */
1092 if (ftest
->k
>= BPF_MEMWORDS
)
1095 case BPF_JMP
| BPF_JA
:
1096 /* Note, the large ftest->k might cause loops.
1097 * Compare this with conditional jumps below,
1098 * where offsets are limited. --ANK (981016)
1100 if (ftest
->k
>= (unsigned int)(flen
- pc
- 1))
1103 case BPF_JMP
| BPF_JEQ
| BPF_K
:
1104 case BPF_JMP
| BPF_JEQ
| BPF_X
:
1105 case BPF_JMP
| BPF_JGE
| BPF_K
:
1106 case BPF_JMP
| BPF_JGE
| BPF_X
:
1107 case BPF_JMP
| BPF_JGT
| BPF_K
:
1108 case BPF_JMP
| BPF_JGT
| BPF_X
:
1109 case BPF_JMP
| BPF_JSET
| BPF_K
:
1110 case BPF_JMP
| BPF_JSET
| BPF_X
:
1111 /* Both conditionals must be safe */
1112 if (pc
+ ftest
->jt
+ 1 >= flen
||
1113 pc
+ ftest
->jf
+ 1 >= flen
)
1116 case BPF_LD
| BPF_W
| BPF_ABS
:
1117 case BPF_LD
| BPF_H
| BPF_ABS
:
1118 case BPF_LD
| BPF_B
| BPF_ABS
:
1120 if (bpf_anc_helper(ftest
) & BPF_ANC
)
1122 /* Ancillary operation unknown or unsupported */
1123 if (anc_found
== false && ftest
->k
>= SKF_AD_OFF
)
1128 /* Last instruction must be a RET code */
1129 switch (filter
[flen
- 1].code
) {
1130 case BPF_RET
| BPF_K
:
1131 case BPF_RET
| BPF_A
:
1132 return check_load_and_stores(filter
, flen
);
1138 static int bpf_prog_store_orig_filter(struct bpf_prog
*fp
,
1139 const struct sock_fprog
*fprog
)
1141 unsigned int fsize
= bpf_classic_proglen(fprog
);
1142 struct sock_fprog_kern
*fkprog
;
1144 fp
->orig_prog
= kmalloc(sizeof(*fkprog
), GFP_KERNEL
);
1148 fkprog
= fp
->orig_prog
;
1149 fkprog
->len
= fprog
->len
;
1151 fkprog
->filter
= kmemdup(fp
->insns
, fsize
,
1152 GFP_KERNEL
| __GFP_NOWARN
);
1153 if (!fkprog
->filter
) {
1154 kfree(fp
->orig_prog
);
1161 static void bpf_release_orig_filter(struct bpf_prog
*fp
)
1163 struct sock_fprog_kern
*fprog
= fp
->orig_prog
;
1166 kfree(fprog
->filter
);
1171 static void __bpf_prog_release(struct bpf_prog
*prog
)
1173 if (prog
->type
== BPF_PROG_TYPE_SOCKET_FILTER
) {
1176 bpf_release_orig_filter(prog
);
1177 bpf_prog_free(prog
);
1181 static void __sk_filter_release(struct sk_filter
*fp
)
1183 __bpf_prog_release(fp
->prog
);
1188 * sk_filter_release_rcu - Release a socket filter by rcu_head
1189 * @rcu: rcu_head that contains the sk_filter to free
1191 static void sk_filter_release_rcu(struct rcu_head
*rcu
)
1193 struct sk_filter
*fp
= container_of(rcu
, struct sk_filter
, rcu
);
1195 __sk_filter_release(fp
);
1199 * sk_filter_release - release a socket filter
1200 * @fp: filter to remove
1202 * Remove a filter from a socket and release its resources.
1204 static void sk_filter_release(struct sk_filter
*fp
)
1206 if (refcount_dec_and_test(&fp
->refcnt
))
1207 call_rcu(&fp
->rcu
, sk_filter_release_rcu
);
1210 void sk_filter_uncharge(struct sock
*sk
, struct sk_filter
*fp
)
1212 u32 filter_size
= bpf_prog_size(fp
->prog
->len
);
1214 atomic_sub(filter_size
, &sk
->sk_omem_alloc
);
1215 sk_filter_release(fp
);
1218 /* try to charge the socket memory if there is space available
1219 * return true on success
1221 static bool __sk_filter_charge(struct sock
*sk
, struct sk_filter
*fp
)
1223 int optmem_max
= READ_ONCE(sock_net(sk
)->core
.sysctl_optmem_max
);
1224 u32 filter_size
= bpf_prog_size(fp
->prog
->len
);
1226 /* same check as in sock_kmalloc() */
1227 if (filter_size
<= optmem_max
&&
1228 atomic_read(&sk
->sk_omem_alloc
) + filter_size
< optmem_max
) {
1229 atomic_add(filter_size
, &sk
->sk_omem_alloc
);
1235 bool sk_filter_charge(struct sock
*sk
, struct sk_filter
*fp
)
1237 if (!refcount_inc_not_zero(&fp
->refcnt
))
1240 if (!__sk_filter_charge(sk
, fp
)) {
1241 sk_filter_release(fp
);
1247 static struct bpf_prog
*bpf_migrate_filter(struct bpf_prog
*fp
)
1249 struct sock_filter
*old_prog
;
1250 struct bpf_prog
*old_fp
;
1251 int err
, new_len
, old_len
= fp
->len
;
1252 bool seen_ld_abs
= false;
1254 /* We are free to overwrite insns et al right here as it won't be used at
1255 * this point in time anymore internally after the migration to the eBPF
1256 * instruction representation.
1258 BUILD_BUG_ON(sizeof(struct sock_filter
) !=
1259 sizeof(struct bpf_insn
));
1261 /* Conversion cannot happen on overlapping memory areas,
1262 * so we need to keep the user BPF around until the 2nd
1263 * pass. At this time, the user BPF is stored in fp->insns.
1265 old_prog
= kmemdup(fp
->insns
, old_len
* sizeof(struct sock_filter
),
1266 GFP_KERNEL
| __GFP_NOWARN
);
1272 /* 1st pass: calculate the new program length. */
1273 err
= bpf_convert_filter(old_prog
, old_len
, NULL
, &new_len
,
1278 /* Expand fp for appending the new filter representation. */
1280 fp
= bpf_prog_realloc(old_fp
, bpf_prog_size(new_len
), 0);
1282 /* The old_fp is still around in case we couldn't
1283 * allocate new memory, so uncharge on that one.
1292 /* 2nd pass: remap sock_filter insns into bpf_insn insns. */
1293 err
= bpf_convert_filter(old_prog
, old_len
, fp
, &new_len
,
1296 /* 2nd bpf_convert_filter() can fail only if it fails
1297 * to allocate memory, remapping must succeed. Note,
1298 * that at this time old_fp has already been released
1303 fp
= bpf_prog_select_runtime(fp
, &err
);
1313 __bpf_prog_release(fp
);
1314 return ERR_PTR(err
);
1317 static struct bpf_prog
*bpf_prepare_filter(struct bpf_prog
*fp
,
1318 bpf_aux_classic_check_t trans
)
1322 fp
->bpf_func
= NULL
;
1325 err
= bpf_check_classic(fp
->insns
, fp
->len
);
1327 __bpf_prog_release(fp
);
1328 return ERR_PTR(err
);
1331 /* There might be additional checks and transformations
1332 * needed on classic filters, f.e. in case of seccomp.
1335 err
= trans(fp
->insns
, fp
->len
);
1337 __bpf_prog_release(fp
);
1338 return ERR_PTR(err
);
1342 /* Probe if we can JIT compile the filter and if so, do
1343 * the compilation of the filter.
1345 bpf_jit_compile(fp
);
1347 /* JIT compiler couldn't process this filter, so do the eBPF translation
1348 * for the optimized interpreter.
1351 fp
= bpf_migrate_filter(fp
);
1357 * bpf_prog_create - create an unattached filter
1358 * @pfp: the unattached filter that is created
1359 * @fprog: the filter program
1361 * Create a filter independent of any socket. We first run some
1362 * sanity checks on it to make sure it does not explode on us later.
1363 * If an error occurs or there is insufficient memory for the filter
1364 * a negative errno code is returned. On success the return is zero.
1366 int bpf_prog_create(struct bpf_prog
**pfp
, struct sock_fprog_kern
*fprog
)
1368 unsigned int fsize
= bpf_classic_proglen(fprog
);
1369 struct bpf_prog
*fp
;
1371 /* Make sure new filter is there and in the right amounts. */
1372 if (!bpf_check_basics_ok(fprog
->filter
, fprog
->len
))
1375 fp
= bpf_prog_alloc(bpf_prog_size(fprog
->len
), 0);
1379 memcpy(fp
->insns
, fprog
->filter
, fsize
);
1381 fp
->len
= fprog
->len
;
1382 /* Since unattached filters are not copied back to user
1383 * space through sk_get_filter(), we do not need to hold
1384 * a copy here, and can spare us the work.
1386 fp
->orig_prog
= NULL
;
1388 /* bpf_prepare_filter() already takes care of freeing
1389 * memory in case something goes wrong.
1391 fp
= bpf_prepare_filter(fp
, NULL
);
1398 EXPORT_SYMBOL_GPL(bpf_prog_create
);
1401 * bpf_prog_create_from_user - create an unattached filter from user buffer
1402 * @pfp: the unattached filter that is created
1403 * @fprog: the filter program
1404 * @trans: post-classic verifier transformation handler
1405 * @save_orig: save classic BPF program
1407 * This function effectively does the same as bpf_prog_create(), only
1408 * that it builds up its insns buffer from user space provided buffer.
1409 * It also allows for passing a bpf_aux_classic_check_t handler.
1411 int bpf_prog_create_from_user(struct bpf_prog
**pfp
, struct sock_fprog
*fprog
,
1412 bpf_aux_classic_check_t trans
, bool save_orig
)
1414 unsigned int fsize
= bpf_classic_proglen(fprog
);
1415 struct bpf_prog
*fp
;
1418 /* Make sure new filter is there and in the right amounts. */
1419 if (!bpf_check_basics_ok(fprog
->filter
, fprog
->len
))
1422 fp
= bpf_prog_alloc(bpf_prog_size(fprog
->len
), 0);
1426 if (copy_from_user(fp
->insns
, fprog
->filter
, fsize
)) {
1427 __bpf_prog_free(fp
);
1431 fp
->len
= fprog
->len
;
1432 fp
->orig_prog
= NULL
;
1435 err
= bpf_prog_store_orig_filter(fp
, fprog
);
1437 __bpf_prog_free(fp
);
1442 /* bpf_prepare_filter() already takes care of freeing
1443 * memory in case something goes wrong.
1445 fp
= bpf_prepare_filter(fp
, trans
);
1452 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user
);
1454 void bpf_prog_destroy(struct bpf_prog
*fp
)
1456 __bpf_prog_release(fp
);
1458 EXPORT_SYMBOL_GPL(bpf_prog_destroy
);
1460 static int __sk_attach_prog(struct bpf_prog
*prog
, struct sock
*sk
)
1462 struct sk_filter
*fp
, *old_fp
;
1464 fp
= kmalloc(sizeof(*fp
), GFP_KERNEL
);
1470 if (!__sk_filter_charge(sk
, fp
)) {
1474 refcount_set(&fp
->refcnt
, 1);
1476 old_fp
= rcu_dereference_protected(sk
->sk_filter
,
1477 lockdep_sock_is_held(sk
));
1478 rcu_assign_pointer(sk
->sk_filter
, fp
);
1481 sk_filter_uncharge(sk
, old_fp
);
1487 struct bpf_prog
*__get_filter(struct sock_fprog
*fprog
, struct sock
*sk
)
1489 unsigned int fsize
= bpf_classic_proglen(fprog
);
1490 struct bpf_prog
*prog
;
1493 if (sock_flag(sk
, SOCK_FILTER_LOCKED
))
1494 return ERR_PTR(-EPERM
);
1496 /* Make sure new filter is there and in the right amounts. */
1497 if (!bpf_check_basics_ok(fprog
->filter
, fprog
->len
))
1498 return ERR_PTR(-EINVAL
);
1500 prog
= bpf_prog_alloc(bpf_prog_size(fprog
->len
), 0);
1502 return ERR_PTR(-ENOMEM
);
1504 if (copy_from_user(prog
->insns
, fprog
->filter
, fsize
)) {
1505 __bpf_prog_free(prog
);
1506 return ERR_PTR(-EFAULT
);
1509 prog
->len
= fprog
->len
;
1511 err
= bpf_prog_store_orig_filter(prog
, fprog
);
1513 __bpf_prog_free(prog
);
1514 return ERR_PTR(-ENOMEM
);
1517 /* bpf_prepare_filter() already takes care of freeing
1518 * memory in case something goes wrong.
1520 return bpf_prepare_filter(prog
, NULL
);
1524 * sk_attach_filter - attach a socket filter
1525 * @fprog: the filter program
1526 * @sk: the socket to use
1528 * Attach the user's filter code. We first run some sanity checks on
1529 * it to make sure it does not explode on us later. If an error
1530 * occurs or there is insufficient memory for the filter a negative
1531 * errno code is returned. On success the return is zero.
1533 int sk_attach_filter(struct sock_fprog
*fprog
, struct sock
*sk
)
1535 struct bpf_prog
*prog
= __get_filter(fprog
, sk
);
1539 return PTR_ERR(prog
);
1541 err
= __sk_attach_prog(prog
, sk
);
1543 __bpf_prog_release(prog
);
1549 EXPORT_SYMBOL_GPL(sk_attach_filter
);
1551 int sk_reuseport_attach_filter(struct sock_fprog
*fprog
, struct sock
*sk
)
1553 struct bpf_prog
*prog
= __get_filter(fprog
, sk
);
1554 int err
, optmem_max
;
1557 return PTR_ERR(prog
);
1559 optmem_max
= READ_ONCE(sock_net(sk
)->core
.sysctl_optmem_max
);
1560 if (bpf_prog_size(prog
->len
) > optmem_max
)
1563 err
= reuseport_attach_prog(sk
, prog
);
1566 __bpf_prog_release(prog
);
1571 static struct bpf_prog
*__get_bpf(u32 ufd
, struct sock
*sk
)
1573 if (sock_flag(sk
, SOCK_FILTER_LOCKED
))
1574 return ERR_PTR(-EPERM
);
1576 return bpf_prog_get_type(ufd
, BPF_PROG_TYPE_SOCKET_FILTER
);
1579 int sk_attach_bpf(u32 ufd
, struct sock
*sk
)
1581 struct bpf_prog
*prog
= __get_bpf(ufd
, sk
);
1585 return PTR_ERR(prog
);
1587 err
= __sk_attach_prog(prog
, sk
);
1596 int sk_reuseport_attach_bpf(u32 ufd
, struct sock
*sk
)
1598 struct bpf_prog
*prog
;
1599 int err
, optmem_max
;
1601 if (sock_flag(sk
, SOCK_FILTER_LOCKED
))
1604 prog
= bpf_prog_get_type(ufd
, BPF_PROG_TYPE_SOCKET_FILTER
);
1605 if (PTR_ERR(prog
) == -EINVAL
)
1606 prog
= bpf_prog_get_type(ufd
, BPF_PROG_TYPE_SK_REUSEPORT
);
1608 return PTR_ERR(prog
);
1610 if (prog
->type
== BPF_PROG_TYPE_SK_REUSEPORT
) {
1611 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER
1612 * bpf prog (e.g. sockmap). It depends on the
1613 * limitation imposed by bpf_prog_load().
1614 * Hence, sysctl_optmem_max is not checked.
1616 if ((sk
->sk_type
!= SOCK_STREAM
&&
1617 sk
->sk_type
!= SOCK_DGRAM
) ||
1618 (sk
->sk_protocol
!= IPPROTO_UDP
&&
1619 sk
->sk_protocol
!= IPPROTO_TCP
) ||
1620 (sk
->sk_family
!= AF_INET
&&
1621 sk
->sk_family
!= AF_INET6
)) {
1626 /* BPF_PROG_TYPE_SOCKET_FILTER */
1627 optmem_max
= READ_ONCE(sock_net(sk
)->core
.sysctl_optmem_max
);
1628 if (bpf_prog_size(prog
->len
) > optmem_max
) {
1634 err
= reuseport_attach_prog(sk
, prog
);
1642 void sk_reuseport_prog_free(struct bpf_prog
*prog
)
1647 if (prog
->type
== BPF_PROG_TYPE_SK_REUSEPORT
)
1650 bpf_prog_destroy(prog
);
1653 struct bpf_scratchpad
{
1655 __be32 diff
[MAX_BPF_STACK
/ sizeof(__be32
)];
1656 u8 buff
[MAX_BPF_STACK
];
1660 static DEFINE_PER_CPU(struct bpf_scratchpad
, bpf_sp
);
1662 static inline int __bpf_try_make_writable(struct sk_buff
*skb
,
1663 unsigned int write_len
)
1665 return skb_ensure_writable(skb
, write_len
);
1668 static inline int bpf_try_make_writable(struct sk_buff
*skb
,
1669 unsigned int write_len
)
1671 int err
= __bpf_try_make_writable(skb
, write_len
);
1673 bpf_compute_data_pointers(skb
);
1677 static int bpf_try_make_head_writable(struct sk_buff
*skb
)
1679 return bpf_try_make_writable(skb
, skb_headlen(skb
));
1682 static inline void bpf_push_mac_rcsum(struct sk_buff
*skb
)
1684 if (skb_at_tc_ingress(skb
))
1685 skb_postpush_rcsum(skb
, skb_mac_header(skb
), skb
->mac_len
);
1688 static inline void bpf_pull_mac_rcsum(struct sk_buff
*skb
)
1690 if (skb_at_tc_ingress(skb
))
1691 skb_postpull_rcsum(skb
, skb_mac_header(skb
), skb
->mac_len
);
1694 BPF_CALL_5(bpf_skb_store_bytes
, struct sk_buff
*, skb
, u32
, offset
,
1695 const void *, from
, u32
, len
, u64
, flags
)
1699 if (unlikely(flags
& ~(BPF_F_RECOMPUTE_CSUM
| BPF_F_INVALIDATE_HASH
)))
1701 if (unlikely(offset
> INT_MAX
))
1703 if (unlikely(bpf_try_make_writable(skb
, offset
+ len
)))
1706 ptr
= skb
->data
+ offset
;
1707 if (flags
& BPF_F_RECOMPUTE_CSUM
)
1708 __skb_postpull_rcsum(skb
, ptr
, len
, offset
);
1710 memcpy(ptr
, from
, len
);
1712 if (flags
& BPF_F_RECOMPUTE_CSUM
)
1713 __skb_postpush_rcsum(skb
, ptr
, len
, offset
);
1714 if (flags
& BPF_F_INVALIDATE_HASH
)
1715 skb_clear_hash(skb
);
1720 static const struct bpf_func_proto bpf_skb_store_bytes_proto
= {
1721 .func
= bpf_skb_store_bytes
,
1723 .ret_type
= RET_INTEGER
,
1724 .arg1_type
= ARG_PTR_TO_CTX
,
1725 .arg2_type
= ARG_ANYTHING
,
1726 .arg3_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
1727 .arg4_type
= ARG_CONST_SIZE
,
1728 .arg5_type
= ARG_ANYTHING
,
1731 int __bpf_skb_store_bytes(struct sk_buff
*skb
, u32 offset
, const void *from
,
1734 return ____bpf_skb_store_bytes(skb
, offset
, from
, len
, flags
);
1737 BPF_CALL_4(bpf_skb_load_bytes
, const struct sk_buff
*, skb
, u32
, offset
,
1738 void *, to
, u32
, len
)
1742 if (unlikely(offset
> INT_MAX
))
1745 ptr
= skb_header_pointer(skb
, offset
, len
, to
);
1749 memcpy(to
, ptr
, len
);
1757 static const struct bpf_func_proto bpf_skb_load_bytes_proto
= {
1758 .func
= bpf_skb_load_bytes
,
1760 .ret_type
= RET_INTEGER
,
1761 .arg1_type
= ARG_PTR_TO_CTX
,
1762 .arg2_type
= ARG_ANYTHING
,
1763 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
1764 .arg4_type
= ARG_CONST_SIZE
,
1767 int __bpf_skb_load_bytes(const struct sk_buff
*skb
, u32 offset
, void *to
, u32 len
)
1769 return ____bpf_skb_load_bytes(skb
, offset
, to
, len
);
1772 BPF_CALL_4(bpf_flow_dissector_load_bytes
,
1773 const struct bpf_flow_dissector
*, ctx
, u32
, offset
,
1774 void *, to
, u32
, len
)
1778 if (unlikely(offset
> 0xffff))
1781 if (unlikely(!ctx
->skb
))
1784 ptr
= skb_header_pointer(ctx
->skb
, offset
, len
, to
);
1788 memcpy(to
, ptr
, len
);
1796 static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto
= {
1797 .func
= bpf_flow_dissector_load_bytes
,
1799 .ret_type
= RET_INTEGER
,
1800 .arg1_type
= ARG_PTR_TO_CTX
,
1801 .arg2_type
= ARG_ANYTHING
,
1802 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
1803 .arg4_type
= ARG_CONST_SIZE
,
1806 BPF_CALL_5(bpf_skb_load_bytes_relative
, const struct sk_buff
*, skb
,
1807 u32
, offset
, void *, to
, u32
, len
, u32
, start_header
)
1809 u8
*end
= skb_tail_pointer(skb
);
1812 if (unlikely(offset
> 0xffff))
1815 switch (start_header
) {
1816 case BPF_HDR_START_MAC
:
1817 if (unlikely(!skb_mac_header_was_set(skb
)))
1819 start
= skb_mac_header(skb
);
1821 case BPF_HDR_START_NET
:
1822 start
= skb_network_header(skb
);
1828 ptr
= start
+ offset
;
1830 if (likely(ptr
+ len
<= end
)) {
1831 memcpy(to
, ptr
, len
);
1840 static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto
= {
1841 .func
= bpf_skb_load_bytes_relative
,
1843 .ret_type
= RET_INTEGER
,
1844 .arg1_type
= ARG_PTR_TO_CTX
,
1845 .arg2_type
= ARG_ANYTHING
,
1846 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
1847 .arg4_type
= ARG_CONST_SIZE
,
1848 .arg5_type
= ARG_ANYTHING
,
1851 BPF_CALL_2(bpf_skb_pull_data
, struct sk_buff
*, skb
, u32
, len
)
1853 /* Idea is the following: should the needed direct read/write
1854 * test fail during runtime, we can pull in more data and redo
1855 * again, since implicitly, we invalidate previous checks here.
1857 * Or, since we know how much we need to make read/writeable,
1858 * this can be done once at the program beginning for direct
1859 * access case. By this we overcome limitations of only current
1860 * headroom being accessible.
1862 return bpf_try_make_writable(skb
, len
? : skb_headlen(skb
));
1865 static const struct bpf_func_proto bpf_skb_pull_data_proto
= {
1866 .func
= bpf_skb_pull_data
,
1868 .ret_type
= RET_INTEGER
,
1869 .arg1_type
= ARG_PTR_TO_CTX
,
1870 .arg2_type
= ARG_ANYTHING
,
1873 BPF_CALL_1(bpf_sk_fullsock
, struct sock
*, sk
)
1875 return sk_fullsock(sk
) ? (unsigned long)sk
: (unsigned long)NULL
;
1878 static const struct bpf_func_proto bpf_sk_fullsock_proto
= {
1879 .func
= bpf_sk_fullsock
,
1881 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
1882 .arg1_type
= ARG_PTR_TO_SOCK_COMMON
,
1885 static inline int sk_skb_try_make_writable(struct sk_buff
*skb
,
1886 unsigned int write_len
)
1888 return __bpf_try_make_writable(skb
, write_len
);
1891 BPF_CALL_2(sk_skb_pull_data
, struct sk_buff
*, skb
, u32
, len
)
1893 /* Idea is the following: should the needed direct read/write
1894 * test fail during runtime, we can pull in more data and redo
1895 * again, since implicitly, we invalidate previous checks here.
1897 * Or, since we know how much we need to make read/writeable,
1898 * this can be done once at the program beginning for direct
1899 * access case. By this we overcome limitations of only current
1900 * headroom being accessible.
1902 return sk_skb_try_make_writable(skb
, len
? : skb_headlen(skb
));
1905 static const struct bpf_func_proto sk_skb_pull_data_proto
= {
1906 .func
= sk_skb_pull_data
,
1908 .ret_type
= RET_INTEGER
,
1909 .arg1_type
= ARG_PTR_TO_CTX
,
1910 .arg2_type
= ARG_ANYTHING
,
1913 BPF_CALL_5(bpf_l3_csum_replace
, struct sk_buff
*, skb
, u32
, offset
,
1914 u64
, from
, u64
, to
, u64
, flags
)
1918 if (unlikely(flags
& ~(BPF_F_HDR_FIELD_MASK
)))
1920 if (unlikely(offset
> 0xffff || offset
& 1))
1922 if (unlikely(bpf_try_make_writable(skb
, offset
+ sizeof(*ptr
))))
1925 ptr
= (__sum16
*)(skb
->data
+ offset
);
1926 switch (flags
& BPF_F_HDR_FIELD_MASK
) {
1928 if (unlikely(from
!= 0))
1931 csum_replace_by_diff(ptr
, to
);
1934 csum_replace2(ptr
, from
, to
);
1937 csum_replace4(ptr
, from
, to
);
1946 static const struct bpf_func_proto bpf_l3_csum_replace_proto
= {
1947 .func
= bpf_l3_csum_replace
,
1949 .ret_type
= RET_INTEGER
,
1950 .arg1_type
= ARG_PTR_TO_CTX
,
1951 .arg2_type
= ARG_ANYTHING
,
1952 .arg3_type
= ARG_ANYTHING
,
1953 .arg4_type
= ARG_ANYTHING
,
1954 .arg5_type
= ARG_ANYTHING
,
1957 BPF_CALL_5(bpf_l4_csum_replace
, struct sk_buff
*, skb
, u32
, offset
,
1958 u64
, from
, u64
, to
, u64
, flags
)
1960 bool is_pseudo
= flags
& BPF_F_PSEUDO_HDR
;
1961 bool is_mmzero
= flags
& BPF_F_MARK_MANGLED_0
;
1962 bool do_mforce
= flags
& BPF_F_MARK_ENFORCE
;
1965 if (unlikely(flags
& ~(BPF_F_MARK_MANGLED_0
| BPF_F_MARK_ENFORCE
|
1966 BPF_F_PSEUDO_HDR
| BPF_F_HDR_FIELD_MASK
)))
1968 if (unlikely(offset
> 0xffff || offset
& 1))
1970 if (unlikely(bpf_try_make_writable(skb
, offset
+ sizeof(*ptr
))))
1973 ptr
= (__sum16
*)(skb
->data
+ offset
);
1974 if (is_mmzero
&& !do_mforce
&& !*ptr
)
1977 switch (flags
& BPF_F_HDR_FIELD_MASK
) {
1979 if (unlikely(from
!= 0))
1982 inet_proto_csum_replace_by_diff(ptr
, skb
, to
, is_pseudo
);
1985 inet_proto_csum_replace2(ptr
, skb
, from
, to
, is_pseudo
);
1988 inet_proto_csum_replace4(ptr
, skb
, from
, to
, is_pseudo
);
1994 if (is_mmzero
&& !*ptr
)
1995 *ptr
= CSUM_MANGLED_0
;
1999 static const struct bpf_func_proto bpf_l4_csum_replace_proto
= {
2000 .func
= bpf_l4_csum_replace
,
2002 .ret_type
= RET_INTEGER
,
2003 .arg1_type
= ARG_PTR_TO_CTX
,
2004 .arg2_type
= ARG_ANYTHING
,
2005 .arg3_type
= ARG_ANYTHING
,
2006 .arg4_type
= ARG_ANYTHING
,
2007 .arg5_type
= ARG_ANYTHING
,
2010 BPF_CALL_5(bpf_csum_diff
, __be32
*, from
, u32
, from_size
,
2011 __be32
*, to
, u32
, to_size
, __wsum
, seed
)
2013 struct bpf_scratchpad
*sp
= this_cpu_ptr(&bpf_sp
);
2014 u32 diff_size
= from_size
+ to_size
;
2017 /* This is quite flexible, some examples:
2019 * from_size == 0, to_size > 0, seed := csum --> pushing data
2020 * from_size > 0, to_size == 0, seed := csum --> pulling data
2021 * from_size > 0, to_size > 0, seed := 0 --> diffing data
2023 * Even for diffing, from_size and to_size don't need to be equal.
2025 if (unlikely(((from_size
| to_size
) & (sizeof(__be32
) - 1)) ||
2026 diff_size
> sizeof(sp
->diff
)))
2029 for (i
= 0; i
< from_size
/ sizeof(__be32
); i
++, j
++)
2030 sp
->diff
[j
] = ~from
[i
];
2031 for (i
= 0; i
< to_size
/ sizeof(__be32
); i
++, j
++)
2032 sp
->diff
[j
] = to
[i
];
2034 return csum_partial(sp
->diff
, diff_size
, seed
);
2037 static const struct bpf_func_proto bpf_csum_diff_proto
= {
2038 .func
= bpf_csum_diff
,
2041 .ret_type
= RET_INTEGER
,
2042 .arg1_type
= ARG_PTR_TO_MEM
| PTR_MAYBE_NULL
| MEM_RDONLY
,
2043 .arg2_type
= ARG_CONST_SIZE_OR_ZERO
,
2044 .arg3_type
= ARG_PTR_TO_MEM
| PTR_MAYBE_NULL
| MEM_RDONLY
,
2045 .arg4_type
= ARG_CONST_SIZE_OR_ZERO
,
2046 .arg5_type
= ARG_ANYTHING
,
2049 BPF_CALL_2(bpf_csum_update
, struct sk_buff
*, skb
, __wsum
, csum
)
2051 /* The interface is to be used in combination with bpf_csum_diff()
2052 * for direct packet writes. csum rotation for alignment as well
2053 * as emulating csum_sub() can be done from the eBPF program.
2055 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2056 return (skb
->csum
= csum_add(skb
->csum
, csum
));
2061 static const struct bpf_func_proto bpf_csum_update_proto
= {
2062 .func
= bpf_csum_update
,
2064 .ret_type
= RET_INTEGER
,
2065 .arg1_type
= ARG_PTR_TO_CTX
,
2066 .arg2_type
= ARG_ANYTHING
,
2069 BPF_CALL_2(bpf_csum_level
, struct sk_buff
*, skb
, u64
, level
)
2071 /* The interface is to be used in combination with bpf_skb_adjust_room()
2072 * for encap/decap of packet headers when BPF_F_ADJ_ROOM_NO_CSUM_RESET
2073 * is passed as flags, for example.
2076 case BPF_CSUM_LEVEL_INC
:
2077 __skb_incr_checksum_unnecessary(skb
);
2079 case BPF_CSUM_LEVEL_DEC
:
2080 __skb_decr_checksum_unnecessary(skb
);
2082 case BPF_CSUM_LEVEL_RESET
:
2083 __skb_reset_checksum_unnecessary(skb
);
2085 case BPF_CSUM_LEVEL_QUERY
:
2086 return skb
->ip_summed
== CHECKSUM_UNNECESSARY
?
2087 skb
->csum_level
: -EACCES
;
2095 static const struct bpf_func_proto bpf_csum_level_proto
= {
2096 .func
= bpf_csum_level
,
2098 .ret_type
= RET_INTEGER
,
2099 .arg1_type
= ARG_PTR_TO_CTX
,
2100 .arg2_type
= ARG_ANYTHING
,
2103 static inline int __bpf_rx_skb(struct net_device
*dev
, struct sk_buff
*skb
)
2105 return dev_forward_skb_nomtu(dev
, skb
);
2108 static inline int __bpf_rx_skb_no_mac(struct net_device
*dev
,
2109 struct sk_buff
*skb
)
2111 int ret
= ____dev_forward_skb(dev
, skb
, false);
2115 ret
= netif_rx(skb
);
2121 static inline int __bpf_tx_skb(struct net_device
*dev
, struct sk_buff
*skb
)
2125 if (dev_xmit_recursion()) {
2126 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2132 skb_set_redirected_noclear(skb
, skb_at_tc_ingress(skb
));
2133 skb_clear_tstamp(skb
);
2135 dev_xmit_recursion_inc();
2136 ret
= dev_queue_xmit(skb
);
2137 dev_xmit_recursion_dec();
2142 static int __bpf_redirect_no_mac(struct sk_buff
*skb
, struct net_device
*dev
,
2145 unsigned int mlen
= skb_network_offset(skb
);
2147 if (unlikely(skb
->len
<= mlen
)) {
2153 __skb_pull(skb
, mlen
);
2155 /* At ingress, the mac header has already been pulled once.
2156 * At egress, skb_pospull_rcsum has to be done in case that
2157 * the skb is originated from ingress (i.e. a forwarded skb)
2158 * to ensure that rcsum starts at net header.
2160 if (!skb_at_tc_ingress(skb
))
2161 skb_postpull_rcsum(skb
, skb_mac_header(skb
), mlen
);
2163 skb_pop_mac_header(skb
);
2164 skb_reset_mac_len(skb
);
2165 return flags
& BPF_F_INGRESS
?
2166 __bpf_rx_skb_no_mac(dev
, skb
) : __bpf_tx_skb(dev
, skb
);
2169 static int __bpf_redirect_common(struct sk_buff
*skb
, struct net_device
*dev
,
2172 /* Verify that a link layer header is carried */
2173 if (unlikely(skb
->mac_header
>= skb
->network_header
|| skb
->len
== 0)) {
2178 bpf_push_mac_rcsum(skb
);
2179 return flags
& BPF_F_INGRESS
?
2180 __bpf_rx_skb(dev
, skb
) : __bpf_tx_skb(dev
, skb
);
2183 static int __bpf_redirect(struct sk_buff
*skb
, struct net_device
*dev
,
2186 if (dev_is_mac_header_xmit(dev
))
2187 return __bpf_redirect_common(skb
, dev
, flags
);
2189 return __bpf_redirect_no_mac(skb
, dev
, flags
);
2192 #if IS_ENABLED(CONFIG_IPV6)
2193 static int bpf_out_neigh_v6(struct net
*net
, struct sk_buff
*skb
,
2194 struct net_device
*dev
, struct bpf_nh_params
*nh
)
2196 u32 hh_len
= LL_RESERVED_SPACE(dev
);
2197 const struct in6_addr
*nexthop
;
2198 struct dst_entry
*dst
= NULL
;
2199 struct neighbour
*neigh
;
2201 if (dev_xmit_recursion()) {
2202 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2207 skb_clear_tstamp(skb
);
2209 if (unlikely(skb_headroom(skb
) < hh_len
&& dev
->header_ops
)) {
2210 skb
= skb_expand_head(skb
, hh_len
);
2218 nexthop
= rt6_nexthop(container_of(dst
, struct rt6_info
, dst
),
2219 &ipv6_hdr(skb
)->daddr
);
2221 nexthop
= &nh
->ipv6_nh
;
2223 neigh
= ip_neigh_gw6(dev
, nexthop
);
2224 if (likely(!IS_ERR(neigh
))) {
2227 sock_confirm_neigh(skb
, neigh
);
2229 dev_xmit_recursion_inc();
2230 ret
= neigh_output(neigh
, skb
, false);
2231 dev_xmit_recursion_dec();
2236 rcu_read_unlock_bh();
2238 IP6_INC_STATS(net
, ip6_dst_idev(dst
), IPSTATS_MIB_OUTNOROUTES
);
2244 static int __bpf_redirect_neigh_v6(struct sk_buff
*skb
, struct net_device
*dev
,
2245 struct bpf_nh_params
*nh
)
2247 const struct ipv6hdr
*ip6h
= ipv6_hdr(skb
);
2248 struct net
*net
= dev_net(dev
);
2249 int err
, ret
= NET_XMIT_DROP
;
2252 struct dst_entry
*dst
;
2253 struct flowi6 fl6
= {
2254 .flowi6_flags
= FLOWI_FLAG_ANYSRC
,
2255 .flowi6_mark
= skb
->mark
,
2256 .flowlabel
= ip6_flowinfo(ip6h
),
2257 .flowi6_oif
= dev
->ifindex
,
2258 .flowi6_proto
= ip6h
->nexthdr
,
2259 .daddr
= ip6h
->daddr
,
2260 .saddr
= ip6h
->saddr
,
2263 dst
= ipv6_stub
->ipv6_dst_lookup_flow(net
, NULL
, &fl6
, NULL
);
2267 skb_dst_set(skb
, dst
);
2268 } else if (nh
->nh_family
!= AF_INET6
) {
2272 err
= bpf_out_neigh_v6(net
, skb
, dev
, nh
);
2273 if (unlikely(net_xmit_eval(err
)))
2274 dev
->stats
.tx_errors
++;
2276 ret
= NET_XMIT_SUCCESS
;
2279 dev
->stats
.tx_errors
++;
2285 static int __bpf_redirect_neigh_v6(struct sk_buff
*skb
, struct net_device
*dev
,
2286 struct bpf_nh_params
*nh
)
2289 return NET_XMIT_DROP
;
2291 #endif /* CONFIG_IPV6 */
2293 #if IS_ENABLED(CONFIG_INET)
2294 static int bpf_out_neigh_v4(struct net
*net
, struct sk_buff
*skb
,
2295 struct net_device
*dev
, struct bpf_nh_params
*nh
)
2297 u32 hh_len
= LL_RESERVED_SPACE(dev
);
2298 struct neighbour
*neigh
;
2299 bool is_v6gw
= false;
2301 if (dev_xmit_recursion()) {
2302 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2307 skb_clear_tstamp(skb
);
2309 if (unlikely(skb_headroom(skb
) < hh_len
&& dev
->header_ops
)) {
2310 skb
= skb_expand_head(skb
, hh_len
);
2317 struct dst_entry
*dst
= skb_dst(skb
);
2318 struct rtable
*rt
= container_of(dst
, struct rtable
, dst
);
2320 neigh
= ip_neigh_for_gw(rt
, skb
, &is_v6gw
);
2321 } else if (nh
->nh_family
== AF_INET6
) {
2322 neigh
= ip_neigh_gw6(dev
, &nh
->ipv6_nh
);
2324 } else if (nh
->nh_family
== AF_INET
) {
2325 neigh
= ip_neigh_gw4(dev
, nh
->ipv4_nh
);
2331 if (likely(!IS_ERR(neigh
))) {
2334 sock_confirm_neigh(skb
, neigh
);
2336 dev_xmit_recursion_inc();
2337 ret
= neigh_output(neigh
, skb
, is_v6gw
);
2338 dev_xmit_recursion_dec();
2349 static int __bpf_redirect_neigh_v4(struct sk_buff
*skb
, struct net_device
*dev
,
2350 struct bpf_nh_params
*nh
)
2352 const struct iphdr
*ip4h
= ip_hdr(skb
);
2353 struct net
*net
= dev_net(dev
);
2354 int err
, ret
= NET_XMIT_DROP
;
2357 struct flowi4 fl4
= {
2358 .flowi4_flags
= FLOWI_FLAG_ANYSRC
,
2359 .flowi4_mark
= skb
->mark
,
2360 .flowi4_tos
= RT_TOS(ip4h
->tos
),
2361 .flowi4_oif
= dev
->ifindex
,
2362 .flowi4_proto
= ip4h
->protocol
,
2363 .daddr
= ip4h
->daddr
,
2364 .saddr
= ip4h
->saddr
,
2368 rt
= ip_route_output_flow(net
, &fl4
, NULL
);
2371 if (rt
->rt_type
!= RTN_UNICAST
&& rt
->rt_type
!= RTN_LOCAL
) {
2376 skb_dst_set(skb
, &rt
->dst
);
2379 err
= bpf_out_neigh_v4(net
, skb
, dev
, nh
);
2380 if (unlikely(net_xmit_eval(err
)))
2381 dev
->stats
.tx_errors
++;
2383 ret
= NET_XMIT_SUCCESS
;
2386 dev
->stats
.tx_errors
++;
2392 static int __bpf_redirect_neigh_v4(struct sk_buff
*skb
, struct net_device
*dev
,
2393 struct bpf_nh_params
*nh
)
2396 return NET_XMIT_DROP
;
2398 #endif /* CONFIG_INET */
2400 static int __bpf_redirect_neigh(struct sk_buff
*skb
, struct net_device
*dev
,
2401 struct bpf_nh_params
*nh
)
2403 struct ethhdr
*ethh
= eth_hdr(skb
);
2405 if (unlikely(skb
->mac_header
>= skb
->network_header
))
2407 bpf_push_mac_rcsum(skb
);
2408 if (is_multicast_ether_addr(ethh
->h_dest
))
2411 skb_pull(skb
, sizeof(*ethh
));
2412 skb_unset_mac_header(skb
);
2413 skb_reset_network_header(skb
);
2415 if (skb
->protocol
== htons(ETH_P_IP
))
2416 return __bpf_redirect_neigh_v4(skb
, dev
, nh
);
2417 else if (skb
->protocol
== htons(ETH_P_IPV6
))
2418 return __bpf_redirect_neigh_v6(skb
, dev
, nh
);
2424 /* Internal, non-exposed redirect flags. */
2426 BPF_F_NEIGH
= (1ULL << 1),
2427 BPF_F_PEER
= (1ULL << 2),
2428 BPF_F_NEXTHOP
= (1ULL << 3),
2429 #define BPF_F_REDIRECT_INTERNAL (BPF_F_NEIGH | BPF_F_PEER | BPF_F_NEXTHOP)
2432 BPF_CALL_3(bpf_clone_redirect
, struct sk_buff
*, skb
, u32
, ifindex
, u64
, flags
)
2434 struct net_device
*dev
;
2435 struct sk_buff
*clone
;
2438 if (unlikely(flags
& (~(BPF_F_INGRESS
) | BPF_F_REDIRECT_INTERNAL
)))
2441 dev
= dev_get_by_index_rcu(dev_net(skb
->dev
), ifindex
);
2445 clone
= skb_clone(skb
, GFP_ATOMIC
);
2446 if (unlikely(!clone
))
2449 /* For direct write, we need to keep the invariant that the skbs
2450 * we're dealing with need to be uncloned. Should uncloning fail
2451 * here, we need to free the just generated clone to unclone once
2454 ret
= bpf_try_make_head_writable(skb
);
2455 if (unlikely(ret
)) {
2460 return __bpf_redirect(clone
, dev
, flags
);
2463 static const struct bpf_func_proto bpf_clone_redirect_proto
= {
2464 .func
= bpf_clone_redirect
,
2466 .ret_type
= RET_INTEGER
,
2467 .arg1_type
= ARG_PTR_TO_CTX
,
2468 .arg2_type
= ARG_ANYTHING
,
2469 .arg3_type
= ARG_ANYTHING
,
2472 DEFINE_PER_CPU(struct bpf_redirect_info
, bpf_redirect_info
);
2473 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info
);
2475 static struct net_device
*skb_get_peer_dev(struct net_device
*dev
)
2477 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2479 if (likely(ops
->ndo_get_peer_dev
))
2480 return INDIRECT_CALL_1(ops
->ndo_get_peer_dev
,
2481 netkit_peer_dev
, dev
);
2485 int skb_do_redirect(struct sk_buff
*skb
)
2487 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
2488 struct net
*net
= dev_net(skb
->dev
);
2489 struct net_device
*dev
;
2490 u32 flags
= ri
->flags
;
2492 dev
= dev_get_by_index_rcu(net
, ri
->tgt_index
);
2497 if (flags
& BPF_F_PEER
) {
2498 if (unlikely(!skb_at_tc_ingress(skb
)))
2500 dev
= skb_get_peer_dev(dev
);
2501 if (unlikely(!dev
||
2502 !(dev
->flags
& IFF_UP
) ||
2503 net_eq(net
, dev_net(dev
))))
2506 dev_sw_netstats_rx_add(dev
, skb
->len
);
2509 return flags
& BPF_F_NEIGH
?
2510 __bpf_redirect_neigh(skb
, dev
, flags
& BPF_F_NEXTHOP
?
2512 __bpf_redirect(skb
, dev
, flags
);
2518 BPF_CALL_2(bpf_redirect
, u32
, ifindex
, u64
, flags
)
2520 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
2522 if (unlikely(flags
& (~(BPF_F_INGRESS
) | BPF_F_REDIRECT_INTERNAL
)))
2526 ri
->tgt_index
= ifindex
;
2528 return TC_ACT_REDIRECT
;
2531 static const struct bpf_func_proto bpf_redirect_proto
= {
2532 .func
= bpf_redirect
,
2534 .ret_type
= RET_INTEGER
,
2535 .arg1_type
= ARG_ANYTHING
,
2536 .arg2_type
= ARG_ANYTHING
,
2539 BPF_CALL_2(bpf_redirect_peer
, u32
, ifindex
, u64
, flags
)
2541 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
2543 if (unlikely(flags
))
2546 ri
->flags
= BPF_F_PEER
;
2547 ri
->tgt_index
= ifindex
;
2549 return TC_ACT_REDIRECT
;
2552 static const struct bpf_func_proto bpf_redirect_peer_proto
= {
2553 .func
= bpf_redirect_peer
,
2555 .ret_type
= RET_INTEGER
,
2556 .arg1_type
= ARG_ANYTHING
,
2557 .arg2_type
= ARG_ANYTHING
,
2560 BPF_CALL_4(bpf_redirect_neigh
, u32
, ifindex
, struct bpf_redir_neigh
*, params
,
2561 int, plen
, u64
, flags
)
2563 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
2565 if (unlikely((plen
&& plen
< sizeof(*params
)) || flags
))
2568 ri
->flags
= BPF_F_NEIGH
| (plen
? BPF_F_NEXTHOP
: 0);
2569 ri
->tgt_index
= ifindex
;
2571 BUILD_BUG_ON(sizeof(struct bpf_redir_neigh
) != sizeof(struct bpf_nh_params
));
2573 memcpy(&ri
->nh
, params
, sizeof(ri
->nh
));
2575 return TC_ACT_REDIRECT
;
2578 static const struct bpf_func_proto bpf_redirect_neigh_proto
= {
2579 .func
= bpf_redirect_neigh
,
2581 .ret_type
= RET_INTEGER
,
2582 .arg1_type
= ARG_ANYTHING
,
2583 .arg2_type
= ARG_PTR_TO_MEM
| PTR_MAYBE_NULL
| MEM_RDONLY
,
2584 .arg3_type
= ARG_CONST_SIZE_OR_ZERO
,
2585 .arg4_type
= ARG_ANYTHING
,
2588 BPF_CALL_2(bpf_msg_apply_bytes
, struct sk_msg
*, msg
, u32
, bytes
)
2590 msg
->apply_bytes
= bytes
;
2594 static const struct bpf_func_proto bpf_msg_apply_bytes_proto
= {
2595 .func
= bpf_msg_apply_bytes
,
2597 .ret_type
= RET_INTEGER
,
2598 .arg1_type
= ARG_PTR_TO_CTX
,
2599 .arg2_type
= ARG_ANYTHING
,
2602 BPF_CALL_2(bpf_msg_cork_bytes
, struct sk_msg
*, msg
, u32
, bytes
)
2604 msg
->cork_bytes
= bytes
;
2608 static void sk_msg_reset_curr(struct sk_msg
*msg
)
2610 u32 i
= msg
->sg
.start
;
2614 len
+= sk_msg_elem(msg
, i
)->length
;
2615 sk_msg_iter_var_next(i
);
2616 if (len
>= msg
->sg
.size
)
2618 } while (i
!= msg
->sg
.end
);
2621 msg
->sg
.copybreak
= 0;
2624 static const struct bpf_func_proto bpf_msg_cork_bytes_proto
= {
2625 .func
= bpf_msg_cork_bytes
,
2627 .ret_type
= RET_INTEGER
,
2628 .arg1_type
= ARG_PTR_TO_CTX
,
2629 .arg2_type
= ARG_ANYTHING
,
2632 BPF_CALL_4(bpf_msg_pull_data
, struct sk_msg
*, msg
, u32
, start
,
2633 u32
, end
, u64
, flags
)
2635 u32 len
= 0, offset
= 0, copy
= 0, poffset
= 0, bytes
= end
- start
;
2636 u32 first_sge
, last_sge
, i
, shift
, bytes_sg_total
;
2637 struct scatterlist
*sge
;
2638 u8
*raw
, *to
, *from
;
2641 if (unlikely(flags
|| end
<= start
))
2644 /* First find the starting scatterlist element */
2648 len
= sk_msg_elem(msg
, i
)->length
;
2649 if (start
< offset
+ len
)
2651 sk_msg_iter_var_next(i
);
2652 } while (i
!= msg
->sg
.end
);
2654 if (unlikely(start
>= offset
+ len
))
2658 /* The start may point into the sg element so we need to also
2659 * account for the headroom.
2661 bytes_sg_total
= start
- offset
+ bytes
;
2662 if (!test_bit(i
, msg
->sg
.copy
) && bytes_sg_total
<= len
)
2665 /* At this point we need to linearize multiple scatterlist
2666 * elements or a single shared page. Either way we need to
2667 * copy into a linear buffer exclusively owned by BPF. Then
2668 * place the buffer in the scatterlist and fixup the original
2669 * entries by removing the entries now in the linear buffer
2670 * and shifting the remaining entries. For now we do not try
2671 * to copy partial entries to avoid complexity of running out
2672 * of sg_entry slots. The downside is reading a single byte
2673 * will copy the entire sg entry.
2676 copy
+= sk_msg_elem(msg
, i
)->length
;
2677 sk_msg_iter_var_next(i
);
2678 if (bytes_sg_total
<= copy
)
2680 } while (i
!= msg
->sg
.end
);
2683 if (unlikely(bytes_sg_total
> copy
))
2686 page
= alloc_pages(__GFP_NOWARN
| GFP_ATOMIC
| __GFP_COMP
,
2688 if (unlikely(!page
))
2691 raw
= page_address(page
);
2694 sge
= sk_msg_elem(msg
, i
);
2695 from
= sg_virt(sge
);
2699 memcpy(to
, from
, len
);
2702 put_page(sg_page(sge
));
2704 sk_msg_iter_var_next(i
);
2705 } while (i
!= last_sge
);
2707 sg_set_page(&msg
->sg
.data
[first_sge
], page
, copy
, 0);
2709 /* To repair sg ring we need to shift entries. If we only
2710 * had a single entry though we can just replace it and
2711 * be done. Otherwise walk the ring and shift the entries.
2713 WARN_ON_ONCE(last_sge
== first_sge
);
2714 shift
= last_sge
> first_sge
?
2715 last_sge
- first_sge
- 1 :
2716 NR_MSG_FRAG_IDS
- first_sge
+ last_sge
- 1;
2721 sk_msg_iter_var_next(i
);
2725 if (i
+ shift
>= NR_MSG_FRAG_IDS
)
2726 move_from
= i
+ shift
- NR_MSG_FRAG_IDS
;
2728 move_from
= i
+ shift
;
2729 if (move_from
== msg
->sg
.end
)
2732 msg
->sg
.data
[i
] = msg
->sg
.data
[move_from
];
2733 msg
->sg
.data
[move_from
].length
= 0;
2734 msg
->sg
.data
[move_from
].page_link
= 0;
2735 msg
->sg
.data
[move_from
].offset
= 0;
2736 sk_msg_iter_var_next(i
);
2739 msg
->sg
.end
= msg
->sg
.end
- shift
> msg
->sg
.end
?
2740 msg
->sg
.end
- shift
+ NR_MSG_FRAG_IDS
:
2741 msg
->sg
.end
- shift
;
2743 sk_msg_reset_curr(msg
);
2744 msg
->data
= sg_virt(&msg
->sg
.data
[first_sge
]) + start
- offset
;
2745 msg
->data_end
= msg
->data
+ bytes
;
2749 static const struct bpf_func_proto bpf_msg_pull_data_proto
= {
2750 .func
= bpf_msg_pull_data
,
2752 .ret_type
= RET_INTEGER
,
2753 .arg1_type
= ARG_PTR_TO_CTX
,
2754 .arg2_type
= ARG_ANYTHING
,
2755 .arg3_type
= ARG_ANYTHING
,
2756 .arg4_type
= ARG_ANYTHING
,
2759 BPF_CALL_4(bpf_msg_push_data
, struct sk_msg
*, msg
, u32
, start
,
2760 u32
, len
, u64
, flags
)
2762 struct scatterlist sge
, nsge
, nnsge
, rsge
= {0}, *psge
;
2763 u32
new, i
= 0, l
= 0, space
, copy
= 0, offset
= 0;
2764 u8
*raw
, *to
, *from
;
2767 if (unlikely(flags
))
2770 if (unlikely(len
== 0))
2773 /* First find the starting scatterlist element */
2777 l
= sk_msg_elem(msg
, i
)->length
;
2779 if (start
< offset
+ l
)
2781 sk_msg_iter_var_next(i
);
2782 } while (i
!= msg
->sg
.end
);
2784 if (start
>= offset
+ l
)
2787 space
= MAX_MSG_FRAGS
- sk_msg_elem_used(msg
);
2789 /* If no space available will fallback to copy, we need at
2790 * least one scatterlist elem available to push data into
2791 * when start aligns to the beginning of an element or two
2792 * when it falls inside an element. We handle the start equals
2793 * offset case because its the common case for inserting a
2796 if (!space
|| (space
== 1 && start
!= offset
))
2797 copy
= msg
->sg
.data
[i
].length
;
2799 page
= alloc_pages(__GFP_NOWARN
| GFP_ATOMIC
| __GFP_COMP
,
2800 get_order(copy
+ len
));
2801 if (unlikely(!page
))
2807 raw
= page_address(page
);
2809 psge
= sk_msg_elem(msg
, i
);
2810 front
= start
- offset
;
2811 back
= psge
->length
- front
;
2812 from
= sg_virt(psge
);
2815 memcpy(raw
, from
, front
);
2819 to
= raw
+ front
+ len
;
2821 memcpy(to
, from
, back
);
2824 put_page(sg_page(psge
));
2825 } else if (start
- offset
) {
2826 psge
= sk_msg_elem(msg
, i
);
2827 rsge
= sk_msg_elem_cpy(msg
, i
);
2829 psge
->length
= start
- offset
;
2830 rsge
.length
-= psge
->length
;
2831 rsge
.offset
+= start
;
2833 sk_msg_iter_var_next(i
);
2834 sg_unmark_end(psge
);
2835 sg_unmark_end(&rsge
);
2836 sk_msg_iter_next(msg
, end
);
2839 /* Slot(s) to place newly allocated data */
2842 /* Shift one or two slots as needed */
2844 sge
= sk_msg_elem_cpy(msg
, i
);
2846 sk_msg_iter_var_next(i
);
2847 sg_unmark_end(&sge
);
2848 sk_msg_iter_next(msg
, end
);
2850 nsge
= sk_msg_elem_cpy(msg
, i
);
2852 sk_msg_iter_var_next(i
);
2853 nnsge
= sk_msg_elem_cpy(msg
, i
);
2856 while (i
!= msg
->sg
.end
) {
2857 msg
->sg
.data
[i
] = sge
;
2859 sk_msg_iter_var_next(i
);
2862 nnsge
= sk_msg_elem_cpy(msg
, i
);
2864 nsge
= sk_msg_elem_cpy(msg
, i
);
2869 /* Place newly allocated data buffer */
2870 sk_mem_charge(msg
->sk
, len
);
2871 msg
->sg
.size
+= len
;
2872 __clear_bit(new, msg
->sg
.copy
);
2873 sg_set_page(&msg
->sg
.data
[new], page
, len
+ copy
, 0);
2875 get_page(sg_page(&rsge
));
2876 sk_msg_iter_var_next(new);
2877 msg
->sg
.data
[new] = rsge
;
2880 sk_msg_reset_curr(msg
);
2881 sk_msg_compute_data_pointers(msg
);
2885 static const struct bpf_func_proto bpf_msg_push_data_proto
= {
2886 .func
= bpf_msg_push_data
,
2888 .ret_type
= RET_INTEGER
,
2889 .arg1_type
= ARG_PTR_TO_CTX
,
2890 .arg2_type
= ARG_ANYTHING
,
2891 .arg3_type
= ARG_ANYTHING
,
2892 .arg4_type
= ARG_ANYTHING
,
2895 static void sk_msg_shift_left(struct sk_msg
*msg
, int i
)
2901 sk_msg_iter_var_next(i
);
2902 msg
->sg
.data
[prev
] = msg
->sg
.data
[i
];
2903 } while (i
!= msg
->sg
.end
);
2905 sk_msg_iter_prev(msg
, end
);
2908 static void sk_msg_shift_right(struct sk_msg
*msg
, int i
)
2910 struct scatterlist tmp
, sge
;
2912 sk_msg_iter_next(msg
, end
);
2913 sge
= sk_msg_elem_cpy(msg
, i
);
2914 sk_msg_iter_var_next(i
);
2915 tmp
= sk_msg_elem_cpy(msg
, i
);
2917 while (i
!= msg
->sg
.end
) {
2918 msg
->sg
.data
[i
] = sge
;
2919 sk_msg_iter_var_next(i
);
2921 tmp
= sk_msg_elem_cpy(msg
, i
);
2925 BPF_CALL_4(bpf_msg_pop_data
, struct sk_msg
*, msg
, u32
, start
,
2926 u32
, len
, u64
, flags
)
2928 u32 i
= 0, l
= 0, space
, offset
= 0;
2929 u64 last
= start
+ len
;
2932 if (unlikely(flags
))
2935 /* First find the starting scatterlist element */
2939 l
= sk_msg_elem(msg
, i
)->length
;
2941 if (start
< offset
+ l
)
2943 sk_msg_iter_var_next(i
);
2944 } while (i
!= msg
->sg
.end
);
2946 /* Bounds checks: start and pop must be inside message */
2947 if (start
>= offset
+ l
|| last
>= msg
->sg
.size
)
2950 space
= MAX_MSG_FRAGS
- sk_msg_elem_used(msg
);
2953 /* --------------| offset
2954 * -| start |-------- len -------|
2956 * |----- a ----|-------- pop -------|----- b ----|
2957 * |______________________________________________| length
2960 * a: region at front of scatter element to save
2961 * b: region at back of scatter element to save when length > A + pop
2962 * pop: region to pop from element, same as input 'pop' here will be
2963 * decremented below per iteration.
2965 * Two top-level cases to handle when start != offset, first B is non
2966 * zero and second B is zero corresponding to when a pop includes more
2969 * Then if B is non-zero AND there is no space allocate space and
2970 * compact A, B regions into page. If there is space shift ring to
2971 * the right free'ing the next element in ring to place B, leaving
2972 * A untouched except to reduce length.
2974 if (start
!= offset
) {
2975 struct scatterlist
*nsge
, *sge
= sk_msg_elem(msg
, i
);
2977 int b
= sge
->length
- pop
- a
;
2979 sk_msg_iter_var_next(i
);
2981 if (pop
< sge
->length
- a
) {
2984 sk_msg_shift_right(msg
, i
);
2985 nsge
= sk_msg_elem(msg
, i
);
2986 get_page(sg_page(sge
));
2989 b
, sge
->offset
+ pop
+ a
);
2991 struct page
*page
, *orig
;
2994 page
= alloc_pages(__GFP_NOWARN
|
2995 __GFP_COMP
| GFP_ATOMIC
,
2997 if (unlikely(!page
))
3001 orig
= sg_page(sge
);
3002 from
= sg_virt(sge
);
3003 to
= page_address(page
);
3004 memcpy(to
, from
, a
);
3005 memcpy(to
+ a
, from
+ a
+ pop
, b
);
3006 sg_set_page(sge
, page
, a
+ b
, 0);
3010 } else if (pop
>= sge
->length
- a
) {
3011 pop
-= (sge
->length
- a
);
3016 /* From above the current layout _must_ be as follows,
3021 * |---- pop ---|---------------- b ------------|
3022 * |____________________________________________| length
3024 * Offset and start of the current msg elem are equal because in the
3025 * previous case we handled offset != start and either consumed the
3026 * entire element and advanced to the next element OR pop == 0.
3028 * Two cases to handle here are first pop is less than the length
3029 * leaving some remainder b above. Simply adjust the element's layout
3030 * in this case. Or pop >= length of the element so that b = 0. In this
3031 * case advance to next element decrementing pop.
3034 struct scatterlist
*sge
= sk_msg_elem(msg
, i
);
3036 if (pop
< sge
->length
) {
3042 sk_msg_shift_left(msg
, i
);
3044 sk_msg_iter_var_next(i
);
3047 sk_mem_uncharge(msg
->sk
, len
- pop
);
3048 msg
->sg
.size
-= (len
- pop
);
3049 sk_msg_reset_curr(msg
);
3050 sk_msg_compute_data_pointers(msg
);
3054 static const struct bpf_func_proto bpf_msg_pop_data_proto
= {
3055 .func
= bpf_msg_pop_data
,
3057 .ret_type
= RET_INTEGER
,
3058 .arg1_type
= ARG_PTR_TO_CTX
,
3059 .arg2_type
= ARG_ANYTHING
,
3060 .arg3_type
= ARG_ANYTHING
,
3061 .arg4_type
= ARG_ANYTHING
,
3064 #ifdef CONFIG_CGROUP_NET_CLASSID
3065 BPF_CALL_0(bpf_get_cgroup_classid_curr
)
3067 return __task_get_classid(current
);
3070 const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto
= {
3071 .func
= bpf_get_cgroup_classid_curr
,
3073 .ret_type
= RET_INTEGER
,
3076 BPF_CALL_1(bpf_skb_cgroup_classid
, const struct sk_buff
*, skb
)
3078 struct sock
*sk
= skb_to_full_sk(skb
);
3080 if (!sk
|| !sk_fullsock(sk
))
3083 return sock_cgroup_classid(&sk
->sk_cgrp_data
);
3086 static const struct bpf_func_proto bpf_skb_cgroup_classid_proto
= {
3087 .func
= bpf_skb_cgroup_classid
,
3089 .ret_type
= RET_INTEGER
,
3090 .arg1_type
= ARG_PTR_TO_CTX
,
3094 BPF_CALL_1(bpf_get_cgroup_classid
, const struct sk_buff
*, skb
)
3096 return task_get_classid(skb
);
3099 static const struct bpf_func_proto bpf_get_cgroup_classid_proto
= {
3100 .func
= bpf_get_cgroup_classid
,
3102 .ret_type
= RET_INTEGER
,
3103 .arg1_type
= ARG_PTR_TO_CTX
,
3106 BPF_CALL_1(bpf_get_route_realm
, const struct sk_buff
*, skb
)
3108 return dst_tclassid(skb
);
3111 static const struct bpf_func_proto bpf_get_route_realm_proto
= {
3112 .func
= bpf_get_route_realm
,
3114 .ret_type
= RET_INTEGER
,
3115 .arg1_type
= ARG_PTR_TO_CTX
,
3118 BPF_CALL_1(bpf_get_hash_recalc
, struct sk_buff
*, skb
)
3120 /* If skb_clear_hash() was called due to mangling, we can
3121 * trigger SW recalculation here. Later access to hash
3122 * can then use the inline skb->hash via context directly
3123 * instead of calling this helper again.
3125 return skb_get_hash(skb
);
3128 static const struct bpf_func_proto bpf_get_hash_recalc_proto
= {
3129 .func
= bpf_get_hash_recalc
,
3131 .ret_type
= RET_INTEGER
,
3132 .arg1_type
= ARG_PTR_TO_CTX
,
3135 BPF_CALL_1(bpf_set_hash_invalid
, struct sk_buff
*, skb
)
3137 /* After all direct packet write, this can be used once for
3138 * triggering a lazy recalc on next skb_get_hash() invocation.
3140 skb_clear_hash(skb
);
3144 static const struct bpf_func_proto bpf_set_hash_invalid_proto
= {
3145 .func
= bpf_set_hash_invalid
,
3147 .ret_type
= RET_INTEGER
,
3148 .arg1_type
= ARG_PTR_TO_CTX
,
3151 BPF_CALL_2(bpf_set_hash
, struct sk_buff
*, skb
, u32
, hash
)
3153 /* Set user specified hash as L4(+), so that it gets returned
3154 * on skb_get_hash() call unless BPF prog later on triggers a
3157 __skb_set_sw_hash(skb
, hash
, true);
3161 static const struct bpf_func_proto bpf_set_hash_proto
= {
3162 .func
= bpf_set_hash
,
3164 .ret_type
= RET_INTEGER
,
3165 .arg1_type
= ARG_PTR_TO_CTX
,
3166 .arg2_type
= ARG_ANYTHING
,
3169 BPF_CALL_3(bpf_skb_vlan_push
, struct sk_buff
*, skb
, __be16
, vlan_proto
,
3174 if (unlikely(vlan_proto
!= htons(ETH_P_8021Q
) &&
3175 vlan_proto
!= htons(ETH_P_8021AD
)))
3176 vlan_proto
= htons(ETH_P_8021Q
);
3178 bpf_push_mac_rcsum(skb
);
3179 ret
= skb_vlan_push(skb
, vlan_proto
, vlan_tci
);
3180 bpf_pull_mac_rcsum(skb
);
3182 bpf_compute_data_pointers(skb
);
3186 static const struct bpf_func_proto bpf_skb_vlan_push_proto
= {
3187 .func
= bpf_skb_vlan_push
,
3189 .ret_type
= RET_INTEGER
,
3190 .arg1_type
= ARG_PTR_TO_CTX
,
3191 .arg2_type
= ARG_ANYTHING
,
3192 .arg3_type
= ARG_ANYTHING
,
3195 BPF_CALL_1(bpf_skb_vlan_pop
, struct sk_buff
*, skb
)
3199 bpf_push_mac_rcsum(skb
);
3200 ret
= skb_vlan_pop(skb
);
3201 bpf_pull_mac_rcsum(skb
);
3203 bpf_compute_data_pointers(skb
);
3207 static const struct bpf_func_proto bpf_skb_vlan_pop_proto
= {
3208 .func
= bpf_skb_vlan_pop
,
3210 .ret_type
= RET_INTEGER
,
3211 .arg1_type
= ARG_PTR_TO_CTX
,
3214 static int bpf_skb_generic_push(struct sk_buff
*skb
, u32 off
, u32 len
)
3216 /* Caller already did skb_cow() with len as headroom,
3217 * so no need to do it here.
3220 memmove(skb
->data
, skb
->data
+ len
, off
);
3221 memset(skb
->data
+ off
, 0, len
);
3223 /* No skb_postpush_rcsum(skb, skb->data + off, len)
3224 * needed here as it does not change the skb->csum
3225 * result for checksum complete when summing over
3231 static int bpf_skb_generic_pop(struct sk_buff
*skb
, u32 off
, u32 len
)
3235 /* skb_ensure_writable() is not needed here, as we're
3236 * already working on an uncloned skb.
3238 if (unlikely(!pskb_may_pull(skb
, off
+ len
)))
3241 old_data
= skb
->data
;
3242 __skb_pull(skb
, len
);
3243 skb_postpull_rcsum(skb
, old_data
+ off
, len
);
3244 memmove(skb
->data
, old_data
, off
);
3249 static int bpf_skb_net_hdr_push(struct sk_buff
*skb
, u32 off
, u32 len
)
3251 bool trans_same
= skb
->transport_header
== skb
->network_header
;
3254 /* There's no need for __skb_push()/__skb_pull() pair to
3255 * get to the start of the mac header as we're guaranteed
3256 * to always start from here under eBPF.
3258 ret
= bpf_skb_generic_push(skb
, off
, len
);
3260 skb
->mac_header
-= len
;
3261 skb
->network_header
-= len
;
3263 skb
->transport_header
= skb
->network_header
;
3269 static int bpf_skb_net_hdr_pop(struct sk_buff
*skb
, u32 off
, u32 len
)
3271 bool trans_same
= skb
->transport_header
== skb
->network_header
;
3274 /* Same here, __skb_push()/__skb_pull() pair not needed. */
3275 ret
= bpf_skb_generic_pop(skb
, off
, len
);
3277 skb
->mac_header
+= len
;
3278 skb
->network_header
+= len
;
3280 skb
->transport_header
= skb
->network_header
;
3286 static int bpf_skb_proto_4_to_6(struct sk_buff
*skb
)
3288 const u32 len_diff
= sizeof(struct ipv6hdr
) - sizeof(struct iphdr
);
3289 u32 off
= skb_mac_header_len(skb
);
3292 ret
= skb_cow(skb
, len_diff
);
3293 if (unlikely(ret
< 0))
3296 ret
= bpf_skb_net_hdr_push(skb
, off
, len_diff
);
3297 if (unlikely(ret
< 0))
3300 if (skb_is_gso(skb
)) {
3301 struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
3303 /* SKB_GSO_TCPV4 needs to be changed into SKB_GSO_TCPV6. */
3304 if (shinfo
->gso_type
& SKB_GSO_TCPV4
) {
3305 shinfo
->gso_type
&= ~SKB_GSO_TCPV4
;
3306 shinfo
->gso_type
|= SKB_GSO_TCPV6
;
3310 skb
->protocol
= htons(ETH_P_IPV6
);
3311 skb_clear_hash(skb
);
3316 static int bpf_skb_proto_6_to_4(struct sk_buff
*skb
)
3318 const u32 len_diff
= sizeof(struct ipv6hdr
) - sizeof(struct iphdr
);
3319 u32 off
= skb_mac_header_len(skb
);
3322 ret
= skb_unclone(skb
, GFP_ATOMIC
);
3323 if (unlikely(ret
< 0))
3326 ret
= bpf_skb_net_hdr_pop(skb
, off
, len_diff
);
3327 if (unlikely(ret
< 0))
3330 if (skb_is_gso(skb
)) {
3331 struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
3333 /* SKB_GSO_TCPV6 needs to be changed into SKB_GSO_TCPV4. */
3334 if (shinfo
->gso_type
& SKB_GSO_TCPV6
) {
3335 shinfo
->gso_type
&= ~SKB_GSO_TCPV6
;
3336 shinfo
->gso_type
|= SKB_GSO_TCPV4
;
3340 skb
->protocol
= htons(ETH_P_IP
);
3341 skb_clear_hash(skb
);
3346 static int bpf_skb_proto_xlat(struct sk_buff
*skb
, __be16 to_proto
)
3348 __be16 from_proto
= skb
->protocol
;
3350 if (from_proto
== htons(ETH_P_IP
) &&
3351 to_proto
== htons(ETH_P_IPV6
))
3352 return bpf_skb_proto_4_to_6(skb
);
3354 if (from_proto
== htons(ETH_P_IPV6
) &&
3355 to_proto
== htons(ETH_P_IP
))
3356 return bpf_skb_proto_6_to_4(skb
);
3361 BPF_CALL_3(bpf_skb_change_proto
, struct sk_buff
*, skb
, __be16
, proto
,
3366 if (unlikely(flags
))
3369 /* General idea is that this helper does the basic groundwork
3370 * needed for changing the protocol, and eBPF program fills the
3371 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace()
3372 * and other helpers, rather than passing a raw buffer here.
3374 * The rationale is to keep this minimal and without a need to
3375 * deal with raw packet data. F.e. even if we would pass buffers
3376 * here, the program still needs to call the bpf_lX_csum_replace()
3377 * helpers anyway. Plus, this way we keep also separation of
3378 * concerns, since f.e. bpf_skb_store_bytes() should only take
3381 * Currently, additional options and extension header space are
3382 * not supported, but flags register is reserved so we can adapt
3383 * that. For offloads, we mark packet as dodgy, so that headers
3384 * need to be verified first.
3386 ret
= bpf_skb_proto_xlat(skb
, proto
);
3387 bpf_compute_data_pointers(skb
);
3391 static const struct bpf_func_proto bpf_skb_change_proto_proto
= {
3392 .func
= bpf_skb_change_proto
,
3394 .ret_type
= RET_INTEGER
,
3395 .arg1_type
= ARG_PTR_TO_CTX
,
3396 .arg2_type
= ARG_ANYTHING
,
3397 .arg3_type
= ARG_ANYTHING
,
3400 BPF_CALL_2(bpf_skb_change_type
, struct sk_buff
*, skb
, u32
, pkt_type
)
3402 /* We only allow a restricted subset to be changed for now. */
3403 if (unlikely(!skb_pkt_type_ok(skb
->pkt_type
) ||
3404 !skb_pkt_type_ok(pkt_type
)))
3407 skb
->pkt_type
= pkt_type
;
3411 static const struct bpf_func_proto bpf_skb_change_type_proto
= {
3412 .func
= bpf_skb_change_type
,
3414 .ret_type
= RET_INTEGER
,
3415 .arg1_type
= ARG_PTR_TO_CTX
,
3416 .arg2_type
= ARG_ANYTHING
,
3419 static u32
bpf_skb_net_base_len(const struct sk_buff
*skb
)
3421 switch (skb
->protocol
) {
3422 case htons(ETH_P_IP
):
3423 return sizeof(struct iphdr
);
3424 case htons(ETH_P_IPV6
):
3425 return sizeof(struct ipv6hdr
);
3431 #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \
3432 BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3434 #define BPF_F_ADJ_ROOM_DECAP_L3_MASK (BPF_F_ADJ_ROOM_DECAP_L3_IPV4 | \
3435 BPF_F_ADJ_ROOM_DECAP_L3_IPV6)
3437 #define BPF_F_ADJ_ROOM_MASK (BPF_F_ADJ_ROOM_FIXED_GSO | \
3438 BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \
3439 BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \
3440 BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \
3441 BPF_F_ADJ_ROOM_ENCAP_L2_ETH | \
3442 BPF_F_ADJ_ROOM_ENCAP_L2( \
3443 BPF_ADJ_ROOM_ENCAP_L2_MASK) | \
3444 BPF_F_ADJ_ROOM_DECAP_L3_MASK)
3446 static int bpf_skb_net_grow(struct sk_buff
*skb
, u32 off
, u32 len_diff
,
3449 u8 inner_mac_len
= flags
>> BPF_ADJ_ROOM_ENCAP_L2_SHIFT
;
3450 bool encap
= flags
& BPF_F_ADJ_ROOM_ENCAP_L3_MASK
;
3451 u16 mac_len
= 0, inner_net
= 0, inner_trans
= 0;
3452 unsigned int gso_type
= SKB_GSO_DODGY
;
3455 if (skb_is_gso(skb
) && !skb_is_gso_tcp(skb
)) {
3456 /* udp gso_size delineates datagrams, only allow if fixed */
3457 if (!(skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP_L4
) ||
3458 !(flags
& BPF_F_ADJ_ROOM_FIXED_GSO
))
3462 ret
= skb_cow_head(skb
, len_diff
);
3463 if (unlikely(ret
< 0))
3467 if (skb
->protocol
!= htons(ETH_P_IP
) &&
3468 skb
->protocol
!= htons(ETH_P_IPV6
))
3471 if (flags
& BPF_F_ADJ_ROOM_ENCAP_L3_IPV4
&&
3472 flags
& BPF_F_ADJ_ROOM_ENCAP_L3_IPV6
)
3475 if (flags
& BPF_F_ADJ_ROOM_ENCAP_L4_GRE
&&
3476 flags
& BPF_F_ADJ_ROOM_ENCAP_L4_UDP
)
3479 if (flags
& BPF_F_ADJ_ROOM_ENCAP_L2_ETH
&&
3480 inner_mac_len
< ETH_HLEN
)
3483 if (skb
->encapsulation
)
3486 mac_len
= skb
->network_header
- skb
->mac_header
;
3487 inner_net
= skb
->network_header
;
3488 if (inner_mac_len
> len_diff
)
3490 inner_trans
= skb
->transport_header
;
3493 ret
= bpf_skb_net_hdr_push(skb
, off
, len_diff
);
3494 if (unlikely(ret
< 0))
3498 skb
->inner_mac_header
= inner_net
- inner_mac_len
;
3499 skb
->inner_network_header
= inner_net
;
3500 skb
->inner_transport_header
= inner_trans
;
3502 if (flags
& BPF_F_ADJ_ROOM_ENCAP_L2_ETH
)
3503 skb_set_inner_protocol(skb
, htons(ETH_P_TEB
));
3505 skb_set_inner_protocol(skb
, skb
->protocol
);
3507 skb
->encapsulation
= 1;
3508 skb_set_network_header(skb
, mac_len
);
3510 if (flags
& BPF_F_ADJ_ROOM_ENCAP_L4_UDP
)
3511 gso_type
|= SKB_GSO_UDP_TUNNEL
;
3512 else if (flags
& BPF_F_ADJ_ROOM_ENCAP_L4_GRE
)
3513 gso_type
|= SKB_GSO_GRE
;
3514 else if (flags
& BPF_F_ADJ_ROOM_ENCAP_L3_IPV6
)
3515 gso_type
|= SKB_GSO_IPXIP6
;
3516 else if (flags
& BPF_F_ADJ_ROOM_ENCAP_L3_IPV4
)
3517 gso_type
|= SKB_GSO_IPXIP4
;
3519 if (flags
& BPF_F_ADJ_ROOM_ENCAP_L4_GRE
||
3520 flags
& BPF_F_ADJ_ROOM_ENCAP_L4_UDP
) {
3521 int nh_len
= flags
& BPF_F_ADJ_ROOM_ENCAP_L3_IPV6
?
3522 sizeof(struct ipv6hdr
) :
3523 sizeof(struct iphdr
);
3525 skb_set_transport_header(skb
, mac_len
+ nh_len
);
3528 /* Match skb->protocol to new outer l3 protocol */
3529 if (skb
->protocol
== htons(ETH_P_IP
) &&
3530 flags
& BPF_F_ADJ_ROOM_ENCAP_L3_IPV6
)
3531 skb
->protocol
= htons(ETH_P_IPV6
);
3532 else if (skb
->protocol
== htons(ETH_P_IPV6
) &&
3533 flags
& BPF_F_ADJ_ROOM_ENCAP_L3_IPV4
)
3534 skb
->protocol
= htons(ETH_P_IP
);
3537 if (skb_is_gso(skb
)) {
3538 struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
3540 /* Due to header grow, MSS needs to be downgraded. */
3541 if (!(flags
& BPF_F_ADJ_ROOM_FIXED_GSO
))
3542 skb_decrease_gso_size(shinfo
, len_diff
);
3544 /* Header must be checked, and gso_segs recomputed. */
3545 shinfo
->gso_type
|= gso_type
;
3546 shinfo
->gso_segs
= 0;
3552 static int bpf_skb_net_shrink(struct sk_buff
*skb
, u32 off
, u32 len_diff
,
3557 if (unlikely(flags
& ~(BPF_F_ADJ_ROOM_FIXED_GSO
|
3558 BPF_F_ADJ_ROOM_DECAP_L3_MASK
|
3559 BPF_F_ADJ_ROOM_NO_CSUM_RESET
)))
3562 if (skb_is_gso(skb
) && !skb_is_gso_tcp(skb
)) {
3563 /* udp gso_size delineates datagrams, only allow if fixed */
3564 if (!(skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP_L4
) ||
3565 !(flags
& BPF_F_ADJ_ROOM_FIXED_GSO
))
3569 ret
= skb_unclone(skb
, GFP_ATOMIC
);
3570 if (unlikely(ret
< 0))
3573 ret
= bpf_skb_net_hdr_pop(skb
, off
, len_diff
);
3574 if (unlikely(ret
< 0))
3577 /* Match skb->protocol to new outer l3 protocol */
3578 if (skb
->protocol
== htons(ETH_P_IP
) &&
3579 flags
& BPF_F_ADJ_ROOM_DECAP_L3_IPV6
)
3580 skb
->protocol
= htons(ETH_P_IPV6
);
3581 else if (skb
->protocol
== htons(ETH_P_IPV6
) &&
3582 flags
& BPF_F_ADJ_ROOM_DECAP_L3_IPV4
)
3583 skb
->protocol
= htons(ETH_P_IP
);
3585 if (skb_is_gso(skb
)) {
3586 struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
3588 /* Due to header shrink, MSS can be upgraded. */
3589 if (!(flags
& BPF_F_ADJ_ROOM_FIXED_GSO
))
3590 skb_increase_gso_size(shinfo
, len_diff
);
3592 /* Header must be checked, and gso_segs recomputed. */
3593 shinfo
->gso_type
|= SKB_GSO_DODGY
;
3594 shinfo
->gso_segs
= 0;
3600 #define BPF_SKB_MAX_LEN SKB_MAX_ALLOC
3602 BPF_CALL_4(sk_skb_adjust_room
, struct sk_buff
*, skb
, s32
, len_diff
,
3603 u32
, mode
, u64
, flags
)
3605 u32 len_diff_abs
= abs(len_diff
);
3606 bool shrink
= len_diff
< 0;
3609 if (unlikely(flags
|| mode
))
3611 if (unlikely(len_diff_abs
> 0xfffU
))
3615 ret
= skb_cow(skb
, len_diff
);
3616 if (unlikely(ret
< 0))
3618 __skb_push(skb
, len_diff_abs
);
3619 memset(skb
->data
, 0, len_diff_abs
);
3621 if (unlikely(!pskb_may_pull(skb
, len_diff_abs
)))
3623 __skb_pull(skb
, len_diff_abs
);
3625 if (tls_sw_has_ctx_rx(skb
->sk
)) {
3626 struct strp_msg
*rxm
= strp_msg(skb
);
3628 rxm
->full_len
+= len_diff
;
3633 static const struct bpf_func_proto sk_skb_adjust_room_proto
= {
3634 .func
= sk_skb_adjust_room
,
3636 .ret_type
= RET_INTEGER
,
3637 .arg1_type
= ARG_PTR_TO_CTX
,
3638 .arg2_type
= ARG_ANYTHING
,
3639 .arg3_type
= ARG_ANYTHING
,
3640 .arg4_type
= ARG_ANYTHING
,
3643 BPF_CALL_4(bpf_skb_adjust_room
, struct sk_buff
*, skb
, s32
, len_diff
,
3644 u32
, mode
, u64
, flags
)
3646 u32 len_cur
, len_diff_abs
= abs(len_diff
);
3647 u32 len_min
= bpf_skb_net_base_len(skb
);
3648 u32 len_max
= BPF_SKB_MAX_LEN
;
3649 __be16 proto
= skb
->protocol
;
3650 bool shrink
= len_diff
< 0;
3654 if (unlikely(flags
& ~(BPF_F_ADJ_ROOM_MASK
|
3655 BPF_F_ADJ_ROOM_NO_CSUM_RESET
)))
3657 if (unlikely(len_diff_abs
> 0xfffU
))
3659 if (unlikely(proto
!= htons(ETH_P_IP
) &&
3660 proto
!= htons(ETH_P_IPV6
)))
3663 off
= skb_mac_header_len(skb
);
3665 case BPF_ADJ_ROOM_NET
:
3666 off
+= bpf_skb_net_base_len(skb
);
3668 case BPF_ADJ_ROOM_MAC
:
3674 if (flags
& BPF_F_ADJ_ROOM_DECAP_L3_MASK
) {
3678 switch (flags
& BPF_F_ADJ_ROOM_DECAP_L3_MASK
) {
3679 case BPF_F_ADJ_ROOM_DECAP_L3_IPV4
:
3680 len_min
= sizeof(struct iphdr
);
3682 case BPF_F_ADJ_ROOM_DECAP_L3_IPV6
:
3683 len_min
= sizeof(struct ipv6hdr
);
3690 len_cur
= skb
->len
- skb_network_offset(skb
);
3691 if ((shrink
&& (len_diff_abs
>= len_cur
||
3692 len_cur
- len_diff_abs
< len_min
)) ||
3693 (!shrink
&& (skb
->len
+ len_diff_abs
> len_max
&&
3697 ret
= shrink
? bpf_skb_net_shrink(skb
, off
, len_diff_abs
, flags
) :
3698 bpf_skb_net_grow(skb
, off
, len_diff_abs
, flags
);
3699 if (!ret
&& !(flags
& BPF_F_ADJ_ROOM_NO_CSUM_RESET
))
3700 __skb_reset_checksum_unnecessary(skb
);
3702 bpf_compute_data_pointers(skb
);
3706 static const struct bpf_func_proto bpf_skb_adjust_room_proto
= {
3707 .func
= bpf_skb_adjust_room
,
3709 .ret_type
= RET_INTEGER
,
3710 .arg1_type
= ARG_PTR_TO_CTX
,
3711 .arg2_type
= ARG_ANYTHING
,
3712 .arg3_type
= ARG_ANYTHING
,
3713 .arg4_type
= ARG_ANYTHING
,
3716 static u32
__bpf_skb_min_len(const struct sk_buff
*skb
)
3718 u32 min_len
= skb_network_offset(skb
);
3720 if (skb_transport_header_was_set(skb
))
3721 min_len
= skb_transport_offset(skb
);
3722 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
3723 min_len
= skb_checksum_start_offset(skb
) +
3724 skb
->csum_offset
+ sizeof(__sum16
);
3728 static int bpf_skb_grow_rcsum(struct sk_buff
*skb
, unsigned int new_len
)
3730 unsigned int old_len
= skb
->len
;
3733 ret
= __skb_grow_rcsum(skb
, new_len
);
3735 memset(skb
->data
+ old_len
, 0, new_len
- old_len
);
3739 static int bpf_skb_trim_rcsum(struct sk_buff
*skb
, unsigned int new_len
)
3741 return __skb_trim_rcsum(skb
, new_len
);
3744 static inline int __bpf_skb_change_tail(struct sk_buff
*skb
, u32 new_len
,
3747 u32 max_len
= BPF_SKB_MAX_LEN
;
3748 u32 min_len
= __bpf_skb_min_len(skb
);
3751 if (unlikely(flags
|| new_len
> max_len
|| new_len
< min_len
))
3753 if (skb
->encapsulation
)
3756 /* The basic idea of this helper is that it's performing the
3757 * needed work to either grow or trim an skb, and eBPF program
3758 * rewrites the rest via helpers like bpf_skb_store_bytes(),
3759 * bpf_lX_csum_replace() and others rather than passing a raw
3760 * buffer here. This one is a slow path helper and intended
3761 * for replies with control messages.
3763 * Like in bpf_skb_change_proto(), we want to keep this rather
3764 * minimal and without protocol specifics so that we are able
3765 * to separate concerns as in bpf_skb_store_bytes() should only
3766 * be the one responsible for writing buffers.
3768 * It's really expected to be a slow path operation here for
3769 * control message replies, so we're implicitly linearizing,
3770 * uncloning and drop offloads from the skb by this.
3772 ret
= __bpf_try_make_writable(skb
, skb
->len
);
3774 if (new_len
> skb
->len
)
3775 ret
= bpf_skb_grow_rcsum(skb
, new_len
);
3776 else if (new_len
< skb
->len
)
3777 ret
= bpf_skb_trim_rcsum(skb
, new_len
);
3778 if (!ret
&& skb_is_gso(skb
))
3784 BPF_CALL_3(bpf_skb_change_tail
, struct sk_buff
*, skb
, u32
, new_len
,
3787 int ret
= __bpf_skb_change_tail(skb
, new_len
, flags
);
3789 bpf_compute_data_pointers(skb
);
3793 static const struct bpf_func_proto bpf_skb_change_tail_proto
= {
3794 .func
= bpf_skb_change_tail
,
3796 .ret_type
= RET_INTEGER
,
3797 .arg1_type
= ARG_PTR_TO_CTX
,
3798 .arg2_type
= ARG_ANYTHING
,
3799 .arg3_type
= ARG_ANYTHING
,
3802 BPF_CALL_3(sk_skb_change_tail
, struct sk_buff
*, skb
, u32
, new_len
,
3805 return __bpf_skb_change_tail(skb
, new_len
, flags
);
3808 static const struct bpf_func_proto sk_skb_change_tail_proto
= {
3809 .func
= sk_skb_change_tail
,
3811 .ret_type
= RET_INTEGER
,
3812 .arg1_type
= ARG_PTR_TO_CTX
,
3813 .arg2_type
= ARG_ANYTHING
,
3814 .arg3_type
= ARG_ANYTHING
,
3817 static inline int __bpf_skb_change_head(struct sk_buff
*skb
, u32 head_room
,
3820 u32 max_len
= BPF_SKB_MAX_LEN
;
3821 u32 new_len
= skb
->len
+ head_room
;
3824 if (unlikely(flags
|| (!skb_is_gso(skb
) && new_len
> max_len
) ||
3825 new_len
< skb
->len
))
3828 ret
= skb_cow(skb
, head_room
);
3830 /* Idea for this helper is that we currently only
3831 * allow to expand on mac header. This means that
3832 * skb->protocol network header, etc, stay as is.
3833 * Compared to bpf_skb_change_tail(), we're more
3834 * flexible due to not needing to linearize or
3835 * reset GSO. Intention for this helper is to be
3836 * used by an L3 skb that needs to push mac header
3837 * for redirection into L2 device.
3839 __skb_push(skb
, head_room
);
3840 memset(skb
->data
, 0, head_room
);
3841 skb_reset_mac_header(skb
);
3842 skb_reset_mac_len(skb
);
3848 BPF_CALL_3(bpf_skb_change_head
, struct sk_buff
*, skb
, u32
, head_room
,
3851 int ret
= __bpf_skb_change_head(skb
, head_room
, flags
);
3853 bpf_compute_data_pointers(skb
);
3857 static const struct bpf_func_proto bpf_skb_change_head_proto
= {
3858 .func
= bpf_skb_change_head
,
3860 .ret_type
= RET_INTEGER
,
3861 .arg1_type
= ARG_PTR_TO_CTX
,
3862 .arg2_type
= ARG_ANYTHING
,
3863 .arg3_type
= ARG_ANYTHING
,
3866 BPF_CALL_3(sk_skb_change_head
, struct sk_buff
*, skb
, u32
, head_room
,
3869 return __bpf_skb_change_head(skb
, head_room
, flags
);
3872 static const struct bpf_func_proto sk_skb_change_head_proto
= {
3873 .func
= sk_skb_change_head
,
3875 .ret_type
= RET_INTEGER
,
3876 .arg1_type
= ARG_PTR_TO_CTX
,
3877 .arg2_type
= ARG_ANYTHING
,
3878 .arg3_type
= ARG_ANYTHING
,
3881 BPF_CALL_1(bpf_xdp_get_buff_len
, struct xdp_buff
*, xdp
)
3883 return xdp_get_buff_len(xdp
);
3886 static const struct bpf_func_proto bpf_xdp_get_buff_len_proto
= {
3887 .func
= bpf_xdp_get_buff_len
,
3889 .ret_type
= RET_INTEGER
,
3890 .arg1_type
= ARG_PTR_TO_CTX
,
3893 BTF_ID_LIST_SINGLE(bpf_xdp_get_buff_len_bpf_ids
, struct, xdp_buff
)
3895 const struct bpf_func_proto bpf_xdp_get_buff_len_trace_proto
= {
3896 .func
= bpf_xdp_get_buff_len
,
3898 .arg1_type
= ARG_PTR_TO_BTF_ID
,
3899 .arg1_btf_id
= &bpf_xdp_get_buff_len_bpf_ids
[0],
3902 static unsigned long xdp_get_metalen(const struct xdp_buff
*xdp
)
3904 return xdp_data_meta_unsupported(xdp
) ? 0 :
3905 xdp
->data
- xdp
->data_meta
;
3908 BPF_CALL_2(bpf_xdp_adjust_head
, struct xdp_buff
*, xdp
, int, offset
)
3910 void *xdp_frame_end
= xdp
->data_hard_start
+ sizeof(struct xdp_frame
);
3911 unsigned long metalen
= xdp_get_metalen(xdp
);
3912 void *data_start
= xdp_frame_end
+ metalen
;
3913 void *data
= xdp
->data
+ offset
;
3915 if (unlikely(data
< data_start
||
3916 data
> xdp
->data_end
- ETH_HLEN
))
3920 memmove(xdp
->data_meta
+ offset
,
3921 xdp
->data_meta
, metalen
);
3922 xdp
->data_meta
+= offset
;
3928 static const struct bpf_func_proto bpf_xdp_adjust_head_proto
= {
3929 .func
= bpf_xdp_adjust_head
,
3931 .ret_type
= RET_INTEGER
,
3932 .arg1_type
= ARG_PTR_TO_CTX
,
3933 .arg2_type
= ARG_ANYTHING
,
3936 void bpf_xdp_copy_buf(struct xdp_buff
*xdp
, unsigned long off
,
3937 void *buf
, unsigned long len
, bool flush
)
3939 unsigned long ptr_len
, ptr_off
= 0;
3940 skb_frag_t
*next_frag
, *end_frag
;
3941 struct skb_shared_info
*sinfo
;
3945 if (likely(xdp
->data_end
- xdp
->data
>= off
+ len
)) {
3946 src
= flush
? buf
: xdp
->data
+ off
;
3947 dst
= flush
? xdp
->data
+ off
: buf
;
3948 memcpy(dst
, src
, len
);
3952 sinfo
= xdp_get_shared_info_from_buff(xdp
);
3953 end_frag
= &sinfo
->frags
[sinfo
->nr_frags
];
3954 next_frag
= &sinfo
->frags
[0];
3956 ptr_len
= xdp
->data_end
- xdp
->data
;
3957 ptr_buf
= xdp
->data
;
3960 if (off
< ptr_off
+ ptr_len
) {
3961 unsigned long copy_off
= off
- ptr_off
;
3962 unsigned long copy_len
= min(len
, ptr_len
- copy_off
);
3964 src
= flush
? buf
: ptr_buf
+ copy_off
;
3965 dst
= flush
? ptr_buf
+ copy_off
: buf
;
3966 memcpy(dst
, src
, copy_len
);
3973 if (!len
|| next_frag
== end_frag
)
3977 ptr_buf
= skb_frag_address(next_frag
);
3978 ptr_len
= skb_frag_size(next_frag
);
3983 void *bpf_xdp_pointer(struct xdp_buff
*xdp
, u32 offset
, u32 len
)
3985 u32 size
= xdp
->data_end
- xdp
->data
;
3986 struct skb_shared_info
*sinfo
;
3987 void *addr
= xdp
->data
;
3990 if (unlikely(offset
> 0xffff || len
> 0xffff))
3991 return ERR_PTR(-EFAULT
);
3993 if (unlikely(offset
+ len
> xdp_get_buff_len(xdp
)))
3994 return ERR_PTR(-EINVAL
);
3996 if (likely(offset
< size
)) /* linear area */
3999 sinfo
= xdp_get_shared_info_from_buff(xdp
);
4001 for (i
= 0; i
< sinfo
->nr_frags
; i
++) { /* paged area */
4002 u32 frag_size
= skb_frag_size(&sinfo
->frags
[i
]);
4004 if (offset
< frag_size
) {
4005 addr
= skb_frag_address(&sinfo
->frags
[i
]);
4009 offset
-= frag_size
;
4012 return offset
+ len
<= size
? addr
+ offset
: NULL
;
4015 BPF_CALL_4(bpf_xdp_load_bytes
, struct xdp_buff
*, xdp
, u32
, offset
,
4016 void *, buf
, u32
, len
)
4020 ptr
= bpf_xdp_pointer(xdp
, offset
, len
);
4022 return PTR_ERR(ptr
);
4025 bpf_xdp_copy_buf(xdp
, offset
, buf
, len
, false);
4027 memcpy(buf
, ptr
, len
);
4032 static const struct bpf_func_proto bpf_xdp_load_bytes_proto
= {
4033 .func
= bpf_xdp_load_bytes
,
4035 .ret_type
= RET_INTEGER
,
4036 .arg1_type
= ARG_PTR_TO_CTX
,
4037 .arg2_type
= ARG_ANYTHING
,
4038 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
4039 .arg4_type
= ARG_CONST_SIZE
,
4042 int __bpf_xdp_load_bytes(struct xdp_buff
*xdp
, u32 offset
, void *buf
, u32 len
)
4044 return ____bpf_xdp_load_bytes(xdp
, offset
, buf
, len
);
4047 BPF_CALL_4(bpf_xdp_store_bytes
, struct xdp_buff
*, xdp
, u32
, offset
,
4048 void *, buf
, u32
, len
)
4052 ptr
= bpf_xdp_pointer(xdp
, offset
, len
);
4054 return PTR_ERR(ptr
);
4057 bpf_xdp_copy_buf(xdp
, offset
, buf
, len
, true);
4059 memcpy(ptr
, buf
, len
);
4064 static const struct bpf_func_proto bpf_xdp_store_bytes_proto
= {
4065 .func
= bpf_xdp_store_bytes
,
4067 .ret_type
= RET_INTEGER
,
4068 .arg1_type
= ARG_PTR_TO_CTX
,
4069 .arg2_type
= ARG_ANYTHING
,
4070 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
4071 .arg4_type
= ARG_CONST_SIZE
,
4074 int __bpf_xdp_store_bytes(struct xdp_buff
*xdp
, u32 offset
, void *buf
, u32 len
)
4076 return ____bpf_xdp_store_bytes(xdp
, offset
, buf
, len
);
4079 static int bpf_xdp_frags_increase_tail(struct xdp_buff
*xdp
, int offset
)
4081 struct skb_shared_info
*sinfo
= xdp_get_shared_info_from_buff(xdp
);
4082 skb_frag_t
*frag
= &sinfo
->frags
[sinfo
->nr_frags
- 1];
4083 struct xdp_rxq_info
*rxq
= xdp
->rxq
;
4084 unsigned int tailroom
;
4086 if (!rxq
->frag_size
|| rxq
->frag_size
> xdp
->frame_sz
)
4089 tailroom
= rxq
->frag_size
- skb_frag_size(frag
) - skb_frag_off(frag
);
4090 if (unlikely(offset
> tailroom
))
4093 memset(skb_frag_address(frag
) + skb_frag_size(frag
), 0, offset
);
4094 skb_frag_size_add(frag
, offset
);
4095 sinfo
->xdp_frags_size
+= offset
;
4096 if (rxq
->mem
.type
== MEM_TYPE_XSK_BUFF_POOL
)
4097 xsk_buff_get_tail(xdp
)->data_end
+= offset
;
4102 static void bpf_xdp_shrink_data_zc(struct xdp_buff
*xdp
, int shrink
,
4103 struct xdp_mem_info
*mem_info
, bool release
)
4105 struct xdp_buff
*zc_frag
= xsk_buff_get_tail(xdp
);
4108 xsk_buff_del_tail(zc_frag
);
4109 __xdp_return(NULL
, mem_info
, false, zc_frag
);
4111 zc_frag
->data_end
-= shrink
;
4115 static bool bpf_xdp_shrink_data(struct xdp_buff
*xdp
, skb_frag_t
*frag
,
4118 struct xdp_mem_info
*mem_info
= &xdp
->rxq
->mem
;
4119 bool release
= skb_frag_size(frag
) == shrink
;
4121 if (mem_info
->type
== MEM_TYPE_XSK_BUFF_POOL
) {
4122 bpf_xdp_shrink_data_zc(xdp
, shrink
, mem_info
, release
);
4127 struct page
*page
= skb_frag_page(frag
);
4129 __xdp_return(page_address(page
), mem_info
, false, NULL
);
4136 static int bpf_xdp_frags_shrink_tail(struct xdp_buff
*xdp
, int offset
)
4138 struct skb_shared_info
*sinfo
= xdp_get_shared_info_from_buff(xdp
);
4139 int i
, n_frags_free
= 0, len_free
= 0;
4141 if (unlikely(offset
> (int)xdp_get_buff_len(xdp
) - ETH_HLEN
))
4144 for (i
= sinfo
->nr_frags
- 1; i
>= 0 && offset
> 0; i
--) {
4145 skb_frag_t
*frag
= &sinfo
->frags
[i
];
4146 int shrink
= min_t(int, offset
, skb_frag_size(frag
));
4150 if (bpf_xdp_shrink_data(xdp
, frag
, shrink
)) {
4153 skb_frag_size_sub(frag
, shrink
);
4157 sinfo
->nr_frags
-= n_frags_free
;
4158 sinfo
->xdp_frags_size
-= len_free
;
4160 if (unlikely(!sinfo
->nr_frags
)) {
4161 xdp_buff_clear_frags_flag(xdp
);
4162 xdp
->data_end
-= offset
;
4168 BPF_CALL_2(bpf_xdp_adjust_tail
, struct xdp_buff
*, xdp
, int, offset
)
4170 void *data_hard_end
= xdp_data_hard_end(xdp
); /* use xdp->frame_sz */
4171 void *data_end
= xdp
->data_end
+ offset
;
4173 if (unlikely(xdp_buff_has_frags(xdp
))) { /* non-linear xdp buff */
4175 return bpf_xdp_frags_shrink_tail(xdp
, -offset
);
4177 return bpf_xdp_frags_increase_tail(xdp
, offset
);
4180 /* Notice that xdp_data_hard_end have reserved some tailroom */
4181 if (unlikely(data_end
> data_hard_end
))
4184 if (unlikely(data_end
< xdp
->data
+ ETH_HLEN
))
4187 /* Clear memory area on grow, can contain uninit kernel memory */
4189 memset(xdp
->data_end
, 0, offset
);
4191 xdp
->data_end
= data_end
;
4196 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto
= {
4197 .func
= bpf_xdp_adjust_tail
,
4199 .ret_type
= RET_INTEGER
,
4200 .arg1_type
= ARG_PTR_TO_CTX
,
4201 .arg2_type
= ARG_ANYTHING
,
4204 BPF_CALL_2(bpf_xdp_adjust_meta
, struct xdp_buff
*, xdp
, int, offset
)
4206 void *xdp_frame_end
= xdp
->data_hard_start
+ sizeof(struct xdp_frame
);
4207 void *meta
= xdp
->data_meta
+ offset
;
4208 unsigned long metalen
= xdp
->data
- meta
;
4210 if (xdp_data_meta_unsupported(xdp
))
4212 if (unlikely(meta
< xdp_frame_end
||
4215 if (unlikely(xdp_metalen_invalid(metalen
)))
4218 xdp
->data_meta
= meta
;
4223 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto
= {
4224 .func
= bpf_xdp_adjust_meta
,
4226 .ret_type
= RET_INTEGER
,
4227 .arg1_type
= ARG_PTR_TO_CTX
,
4228 .arg2_type
= ARG_ANYTHING
,
4234 * XDP_REDIRECT works by a three-step process, implemented in the functions
4237 * 1. The bpf_redirect() and bpf_redirect_map() helpers will lookup the target
4238 * of the redirect and store it (along with some other metadata) in a per-CPU
4239 * struct bpf_redirect_info.
4241 * 2. When the program returns the XDP_REDIRECT return code, the driver will
4242 * call xdp_do_redirect() which will use the information in struct
4243 * bpf_redirect_info to actually enqueue the frame into a map type-specific
4244 * bulk queue structure.
4246 * 3. Before exiting its NAPI poll loop, the driver will call
4247 * xdp_do_flush(), which will flush all the different bulk queues,
4248 * thus completing the redirect. Note that xdp_do_flush() must be
4249 * called before napi_complete_done() in the driver, as the
4250 * XDP_REDIRECT logic relies on being inside a single NAPI instance
4251 * through to the xdp_do_flush() call for RCU protection of all
4252 * in-kernel data structures.
4255 * Pointers to the map entries will be kept around for this whole sequence of
4256 * steps, protected by RCU. However, there is no top-level rcu_read_lock() in
4257 * the core code; instead, the RCU protection relies on everything happening
4258 * inside a single NAPI poll sequence, which means it's between a pair of calls
4259 * to local_bh_disable()/local_bh_enable().
4261 * The map entries are marked as __rcu and the map code makes sure to
4262 * dereference those pointers with rcu_dereference_check() in a way that works
4263 * for both sections that to hold an rcu_read_lock() and sections that are
4264 * called from NAPI without a separate rcu_read_lock(). The code below does not
4265 * use RCU annotations, but relies on those in the map code.
4267 void xdp_do_flush(void)
4273 EXPORT_SYMBOL_GPL(xdp_do_flush
);
4275 #if defined(CONFIG_DEBUG_NET) && defined(CONFIG_BPF_SYSCALL)
4276 void xdp_do_check_flushed(struct napi_struct
*napi
)
4280 ret
= dev_check_flush();
4281 ret
|= cpu_map_check_flush();
4282 ret
|= xsk_map_check_flush();
4284 WARN_ONCE(ret
, "Missing xdp_do_flush() invocation after NAPI by %ps\n",
4289 void bpf_clear_redirect_map(struct bpf_map
*map
)
4291 struct bpf_redirect_info
*ri
;
4294 for_each_possible_cpu(cpu
) {
4295 ri
= per_cpu_ptr(&bpf_redirect_info
, cpu
);
4296 /* Avoid polluting remote cacheline due to writes if
4297 * not needed. Once we pass this test, we need the
4298 * cmpxchg() to make sure it hasn't been changed in
4299 * the meantime by remote CPU.
4301 if (unlikely(READ_ONCE(ri
->map
) == map
))
4302 cmpxchg(&ri
->map
, map
, NULL
);
4306 DEFINE_STATIC_KEY_FALSE(bpf_master_redirect_enabled_key
);
4307 EXPORT_SYMBOL_GPL(bpf_master_redirect_enabled_key
);
4309 u32
xdp_master_redirect(struct xdp_buff
*xdp
)
4311 struct net_device
*master
, *slave
;
4312 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
4314 master
= netdev_master_upper_dev_get_rcu(xdp
->rxq
->dev
);
4315 slave
= master
->netdev_ops
->ndo_xdp_get_xmit_slave(master
, xdp
);
4316 if (slave
&& slave
!= xdp
->rxq
->dev
) {
4317 /* The target device is different from the receiving device, so
4318 * redirect it to the new device.
4319 * Using XDP_REDIRECT gets the correct behaviour from XDP enabled
4320 * drivers to unmap the packet from their rx ring.
4322 ri
->tgt_index
= slave
->ifindex
;
4323 ri
->map_id
= INT_MAX
;
4324 ri
->map_type
= BPF_MAP_TYPE_UNSPEC
;
4325 return XDP_REDIRECT
;
4329 EXPORT_SYMBOL_GPL(xdp_master_redirect
);
4331 static inline int __xdp_do_redirect_xsk(struct bpf_redirect_info
*ri
,
4332 struct net_device
*dev
,
4333 struct xdp_buff
*xdp
,
4334 struct bpf_prog
*xdp_prog
)
4336 enum bpf_map_type map_type
= ri
->map_type
;
4337 void *fwd
= ri
->tgt_value
;
4338 u32 map_id
= ri
->map_id
;
4341 ri
->map_id
= 0; /* Valid map id idr range: [1,INT_MAX[ */
4342 ri
->map_type
= BPF_MAP_TYPE_UNSPEC
;
4344 err
= __xsk_map_redirect(fwd
, xdp
);
4348 _trace_xdp_redirect_map(dev
, xdp_prog
, fwd
, map_type
, map_id
, ri
->tgt_index
);
4351 _trace_xdp_redirect_map_err(dev
, xdp_prog
, fwd
, map_type
, map_id
, ri
->tgt_index
, err
);
4355 static __always_inline
int __xdp_do_redirect_frame(struct bpf_redirect_info
*ri
,
4356 struct net_device
*dev
,
4357 struct xdp_frame
*xdpf
,
4358 struct bpf_prog
*xdp_prog
)
4360 enum bpf_map_type map_type
= ri
->map_type
;
4361 void *fwd
= ri
->tgt_value
;
4362 u32 map_id
= ri
->map_id
;
4363 struct bpf_map
*map
;
4366 ri
->map_id
= 0; /* Valid map id idr range: [1,INT_MAX[ */
4367 ri
->map_type
= BPF_MAP_TYPE_UNSPEC
;
4369 if (unlikely(!xdpf
)) {
4375 case BPF_MAP_TYPE_DEVMAP
:
4377 case BPF_MAP_TYPE_DEVMAP_HASH
:
4378 map
= READ_ONCE(ri
->map
);
4379 if (unlikely(map
)) {
4380 WRITE_ONCE(ri
->map
, NULL
);
4381 err
= dev_map_enqueue_multi(xdpf
, dev
, map
,
4382 ri
->flags
& BPF_F_EXCLUDE_INGRESS
);
4384 err
= dev_map_enqueue(fwd
, xdpf
, dev
);
4387 case BPF_MAP_TYPE_CPUMAP
:
4388 err
= cpu_map_enqueue(fwd
, xdpf
, dev
);
4390 case BPF_MAP_TYPE_UNSPEC
:
4391 if (map_id
== INT_MAX
) {
4392 fwd
= dev_get_by_index_rcu(dev_net(dev
), ri
->tgt_index
);
4393 if (unlikely(!fwd
)) {
4397 err
= dev_xdp_enqueue(fwd
, xdpf
, dev
);
4408 _trace_xdp_redirect_map(dev
, xdp_prog
, fwd
, map_type
, map_id
, ri
->tgt_index
);
4411 _trace_xdp_redirect_map_err(dev
, xdp_prog
, fwd
, map_type
, map_id
, ri
->tgt_index
, err
);
4415 int xdp_do_redirect(struct net_device
*dev
, struct xdp_buff
*xdp
,
4416 struct bpf_prog
*xdp_prog
)
4418 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
4419 enum bpf_map_type map_type
= ri
->map_type
;
4421 if (map_type
== BPF_MAP_TYPE_XSKMAP
)
4422 return __xdp_do_redirect_xsk(ri
, dev
, xdp
, xdp_prog
);
4424 return __xdp_do_redirect_frame(ri
, dev
, xdp_convert_buff_to_frame(xdp
),
4427 EXPORT_SYMBOL_GPL(xdp_do_redirect
);
4429 int xdp_do_redirect_frame(struct net_device
*dev
, struct xdp_buff
*xdp
,
4430 struct xdp_frame
*xdpf
, struct bpf_prog
*xdp_prog
)
4432 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
4433 enum bpf_map_type map_type
= ri
->map_type
;
4435 if (map_type
== BPF_MAP_TYPE_XSKMAP
)
4436 return __xdp_do_redirect_xsk(ri
, dev
, xdp
, xdp_prog
);
4438 return __xdp_do_redirect_frame(ri
, dev
, xdpf
, xdp_prog
);
4440 EXPORT_SYMBOL_GPL(xdp_do_redirect_frame
);
4442 static int xdp_do_generic_redirect_map(struct net_device
*dev
,
4443 struct sk_buff
*skb
,
4444 struct xdp_buff
*xdp
,
4445 struct bpf_prog
*xdp_prog
,
4447 enum bpf_map_type map_type
, u32 map_id
)
4449 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
4450 struct bpf_map
*map
;
4454 case BPF_MAP_TYPE_DEVMAP
:
4456 case BPF_MAP_TYPE_DEVMAP_HASH
:
4457 map
= READ_ONCE(ri
->map
);
4458 if (unlikely(map
)) {
4459 WRITE_ONCE(ri
->map
, NULL
);
4460 err
= dev_map_redirect_multi(dev
, skb
, xdp_prog
, map
,
4461 ri
->flags
& BPF_F_EXCLUDE_INGRESS
);
4463 err
= dev_map_generic_redirect(fwd
, skb
, xdp_prog
);
4468 case BPF_MAP_TYPE_XSKMAP
:
4469 err
= xsk_generic_rcv(fwd
, xdp
);
4474 case BPF_MAP_TYPE_CPUMAP
:
4475 err
= cpu_map_generic_redirect(fwd
, skb
);
4484 _trace_xdp_redirect_map(dev
, xdp_prog
, fwd
, map_type
, map_id
, ri
->tgt_index
);
4487 _trace_xdp_redirect_map_err(dev
, xdp_prog
, fwd
, map_type
, map_id
, ri
->tgt_index
, err
);
4491 int xdp_do_generic_redirect(struct net_device
*dev
, struct sk_buff
*skb
,
4492 struct xdp_buff
*xdp
, struct bpf_prog
*xdp_prog
)
4494 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
4495 enum bpf_map_type map_type
= ri
->map_type
;
4496 void *fwd
= ri
->tgt_value
;
4497 u32 map_id
= ri
->map_id
;
4500 ri
->map_id
= 0; /* Valid map id idr range: [1,INT_MAX[ */
4501 ri
->map_type
= BPF_MAP_TYPE_UNSPEC
;
4503 if (map_type
== BPF_MAP_TYPE_UNSPEC
&& map_id
== INT_MAX
) {
4504 fwd
= dev_get_by_index_rcu(dev_net(dev
), ri
->tgt_index
);
4505 if (unlikely(!fwd
)) {
4510 err
= xdp_ok_fwd_dev(fwd
, skb
->len
);
4515 _trace_xdp_redirect(dev
, xdp_prog
, ri
->tgt_index
);
4516 generic_xdp_tx(skb
, xdp_prog
);
4520 return xdp_do_generic_redirect_map(dev
, skb
, xdp
, xdp_prog
, fwd
, map_type
, map_id
);
4522 _trace_xdp_redirect_err(dev
, xdp_prog
, ri
->tgt_index
, err
);
4526 BPF_CALL_2(bpf_xdp_redirect
, u32
, ifindex
, u64
, flags
)
4528 struct bpf_redirect_info
*ri
= this_cpu_ptr(&bpf_redirect_info
);
4530 if (unlikely(flags
))
4533 /* NB! Map type UNSPEC and map_id == INT_MAX (never generated
4534 * by map_idr) is used for ifindex based XDP redirect.
4536 ri
->tgt_index
= ifindex
;
4537 ri
->map_id
= INT_MAX
;
4538 ri
->map_type
= BPF_MAP_TYPE_UNSPEC
;
4540 return XDP_REDIRECT
;
4543 static const struct bpf_func_proto bpf_xdp_redirect_proto
= {
4544 .func
= bpf_xdp_redirect
,
4546 .ret_type
= RET_INTEGER
,
4547 .arg1_type
= ARG_ANYTHING
,
4548 .arg2_type
= ARG_ANYTHING
,
4551 BPF_CALL_3(bpf_xdp_redirect_map
, struct bpf_map
*, map
, u64
, key
,
4554 return map
->ops
->map_redirect(map
, key
, flags
);
4557 static const struct bpf_func_proto bpf_xdp_redirect_map_proto
= {
4558 .func
= bpf_xdp_redirect_map
,
4560 .ret_type
= RET_INTEGER
,
4561 .arg1_type
= ARG_CONST_MAP_PTR
,
4562 .arg2_type
= ARG_ANYTHING
,
4563 .arg3_type
= ARG_ANYTHING
,
4566 static unsigned long bpf_skb_copy(void *dst_buff
, const void *skb
,
4567 unsigned long off
, unsigned long len
)
4569 void *ptr
= skb_header_pointer(skb
, off
, len
, dst_buff
);
4573 if (ptr
!= dst_buff
)
4574 memcpy(dst_buff
, ptr
, len
);
4579 BPF_CALL_5(bpf_skb_event_output
, struct sk_buff
*, skb
, struct bpf_map
*, map
,
4580 u64
, flags
, void *, meta
, u64
, meta_size
)
4582 u64 skb_size
= (flags
& BPF_F_CTXLEN_MASK
) >> 32;
4584 if (unlikely(flags
& ~(BPF_F_CTXLEN_MASK
| BPF_F_INDEX_MASK
)))
4586 if (unlikely(!skb
|| skb_size
> skb
->len
))
4589 return bpf_event_output(map
, flags
, meta
, meta_size
, skb
, skb_size
,
4593 static const struct bpf_func_proto bpf_skb_event_output_proto
= {
4594 .func
= bpf_skb_event_output
,
4596 .ret_type
= RET_INTEGER
,
4597 .arg1_type
= ARG_PTR_TO_CTX
,
4598 .arg2_type
= ARG_CONST_MAP_PTR
,
4599 .arg3_type
= ARG_ANYTHING
,
4600 .arg4_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
4601 .arg5_type
= ARG_CONST_SIZE_OR_ZERO
,
4604 BTF_ID_LIST_SINGLE(bpf_skb_output_btf_ids
, struct, sk_buff
)
4606 const struct bpf_func_proto bpf_skb_output_proto
= {
4607 .func
= bpf_skb_event_output
,
4609 .ret_type
= RET_INTEGER
,
4610 .arg1_type
= ARG_PTR_TO_BTF_ID
,
4611 .arg1_btf_id
= &bpf_skb_output_btf_ids
[0],
4612 .arg2_type
= ARG_CONST_MAP_PTR
,
4613 .arg3_type
= ARG_ANYTHING
,
4614 .arg4_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
4615 .arg5_type
= ARG_CONST_SIZE_OR_ZERO
,
4618 static unsigned short bpf_tunnel_key_af(u64 flags
)
4620 return flags
& BPF_F_TUNINFO_IPV6
? AF_INET6
: AF_INET
;
4623 BPF_CALL_4(bpf_skb_get_tunnel_key
, struct sk_buff
*, skb
, struct bpf_tunnel_key
*, to
,
4624 u32
, size
, u64
, flags
)
4626 const struct ip_tunnel_info
*info
= skb_tunnel_info(skb
);
4627 u8 compat
[sizeof(struct bpf_tunnel_key
)];
4631 if (unlikely(!info
|| (flags
& ~(BPF_F_TUNINFO_IPV6
|
4632 BPF_F_TUNINFO_FLAGS
)))) {
4636 if (ip_tunnel_info_af(info
) != bpf_tunnel_key_af(flags
)) {
4640 if (unlikely(size
!= sizeof(struct bpf_tunnel_key
))) {
4643 case offsetof(struct bpf_tunnel_key
, local_ipv6
[0]):
4644 case offsetof(struct bpf_tunnel_key
, tunnel_label
):
4645 case offsetof(struct bpf_tunnel_key
, tunnel_ext
):
4647 case offsetof(struct bpf_tunnel_key
, remote_ipv6
[1]):
4648 /* Fixup deprecated structure layouts here, so we have
4649 * a common path later on.
4651 if (ip_tunnel_info_af(info
) != AF_INET
)
4654 to
= (struct bpf_tunnel_key
*)compat
;
4661 to
->tunnel_id
= be64_to_cpu(info
->key
.tun_id
);
4662 to
->tunnel_tos
= info
->key
.tos
;
4663 to
->tunnel_ttl
= info
->key
.ttl
;
4664 if (flags
& BPF_F_TUNINFO_FLAGS
)
4665 to
->tunnel_flags
= info
->key
.tun_flags
;
4669 if (flags
& BPF_F_TUNINFO_IPV6
) {
4670 memcpy(to
->remote_ipv6
, &info
->key
.u
.ipv6
.src
,
4671 sizeof(to
->remote_ipv6
));
4672 memcpy(to
->local_ipv6
, &info
->key
.u
.ipv6
.dst
,
4673 sizeof(to
->local_ipv6
));
4674 to
->tunnel_label
= be32_to_cpu(info
->key
.label
);
4676 to
->remote_ipv4
= be32_to_cpu(info
->key
.u
.ipv4
.src
);
4677 memset(&to
->remote_ipv6
[1], 0, sizeof(__u32
) * 3);
4678 to
->local_ipv4
= be32_to_cpu(info
->key
.u
.ipv4
.dst
);
4679 memset(&to
->local_ipv6
[1], 0, sizeof(__u32
) * 3);
4680 to
->tunnel_label
= 0;
4683 if (unlikely(size
!= sizeof(struct bpf_tunnel_key
)))
4684 memcpy(to_orig
, to
, size
);
4688 memset(to_orig
, 0, size
);
4692 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto
= {
4693 .func
= bpf_skb_get_tunnel_key
,
4695 .ret_type
= RET_INTEGER
,
4696 .arg1_type
= ARG_PTR_TO_CTX
,
4697 .arg2_type
= ARG_PTR_TO_UNINIT_MEM
,
4698 .arg3_type
= ARG_CONST_SIZE
,
4699 .arg4_type
= ARG_ANYTHING
,
4702 BPF_CALL_3(bpf_skb_get_tunnel_opt
, struct sk_buff
*, skb
, u8
*, to
, u32
, size
)
4704 const struct ip_tunnel_info
*info
= skb_tunnel_info(skb
);
4707 if (unlikely(!info
||
4708 !(info
->key
.tun_flags
& TUNNEL_OPTIONS_PRESENT
))) {
4712 if (unlikely(size
< info
->options_len
)) {
4717 ip_tunnel_info_opts_get(to
, info
);
4718 if (size
> info
->options_len
)
4719 memset(to
+ info
->options_len
, 0, size
- info
->options_len
);
4721 return info
->options_len
;
4723 memset(to
, 0, size
);
4727 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto
= {
4728 .func
= bpf_skb_get_tunnel_opt
,
4730 .ret_type
= RET_INTEGER
,
4731 .arg1_type
= ARG_PTR_TO_CTX
,
4732 .arg2_type
= ARG_PTR_TO_UNINIT_MEM
,
4733 .arg3_type
= ARG_CONST_SIZE
,
4736 static struct metadata_dst __percpu
*md_dst
;
4738 BPF_CALL_4(bpf_skb_set_tunnel_key
, struct sk_buff
*, skb
,
4739 const struct bpf_tunnel_key
*, from
, u32
, size
, u64
, flags
)
4741 struct metadata_dst
*md
= this_cpu_ptr(md_dst
);
4742 u8 compat
[sizeof(struct bpf_tunnel_key
)];
4743 struct ip_tunnel_info
*info
;
4745 if (unlikely(flags
& ~(BPF_F_TUNINFO_IPV6
| BPF_F_ZERO_CSUM_TX
|
4746 BPF_F_DONT_FRAGMENT
| BPF_F_SEQ_NUMBER
|
4747 BPF_F_NO_TUNNEL_KEY
)))
4749 if (unlikely(size
!= sizeof(struct bpf_tunnel_key
))) {
4751 case offsetof(struct bpf_tunnel_key
, local_ipv6
[0]):
4752 case offsetof(struct bpf_tunnel_key
, tunnel_label
):
4753 case offsetof(struct bpf_tunnel_key
, tunnel_ext
):
4754 case offsetof(struct bpf_tunnel_key
, remote_ipv6
[1]):
4755 /* Fixup deprecated structure layouts here, so we have
4756 * a common path later on.
4758 memcpy(compat
, from
, size
);
4759 memset(compat
+ size
, 0, sizeof(compat
) - size
);
4760 from
= (const struct bpf_tunnel_key
*) compat
;
4766 if (unlikely((!(flags
& BPF_F_TUNINFO_IPV6
) && from
->tunnel_label
) ||
4771 dst_hold((struct dst_entry
*) md
);
4772 skb_dst_set(skb
, (struct dst_entry
*) md
);
4774 info
= &md
->u
.tun_info
;
4775 memset(info
, 0, sizeof(*info
));
4776 info
->mode
= IP_TUNNEL_INFO_TX
;
4778 info
->key
.tun_flags
= TUNNEL_KEY
| TUNNEL_CSUM
| TUNNEL_NOCACHE
;
4779 if (flags
& BPF_F_DONT_FRAGMENT
)
4780 info
->key
.tun_flags
|= TUNNEL_DONT_FRAGMENT
;
4781 if (flags
& BPF_F_ZERO_CSUM_TX
)
4782 info
->key
.tun_flags
&= ~TUNNEL_CSUM
;
4783 if (flags
& BPF_F_SEQ_NUMBER
)
4784 info
->key
.tun_flags
|= TUNNEL_SEQ
;
4785 if (flags
& BPF_F_NO_TUNNEL_KEY
)
4786 info
->key
.tun_flags
&= ~TUNNEL_KEY
;
4788 info
->key
.tun_id
= cpu_to_be64(from
->tunnel_id
);
4789 info
->key
.tos
= from
->tunnel_tos
;
4790 info
->key
.ttl
= from
->tunnel_ttl
;
4792 if (flags
& BPF_F_TUNINFO_IPV6
) {
4793 info
->mode
|= IP_TUNNEL_INFO_IPV6
;
4794 memcpy(&info
->key
.u
.ipv6
.dst
, from
->remote_ipv6
,
4795 sizeof(from
->remote_ipv6
));
4796 memcpy(&info
->key
.u
.ipv6
.src
, from
->local_ipv6
,
4797 sizeof(from
->local_ipv6
));
4798 info
->key
.label
= cpu_to_be32(from
->tunnel_label
) &
4799 IPV6_FLOWLABEL_MASK
;
4801 info
->key
.u
.ipv4
.dst
= cpu_to_be32(from
->remote_ipv4
);
4802 info
->key
.u
.ipv4
.src
= cpu_to_be32(from
->local_ipv4
);
4803 info
->key
.flow_flags
= FLOWI_FLAG_ANYSRC
;
4809 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto
= {
4810 .func
= bpf_skb_set_tunnel_key
,
4812 .ret_type
= RET_INTEGER
,
4813 .arg1_type
= ARG_PTR_TO_CTX
,
4814 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
4815 .arg3_type
= ARG_CONST_SIZE
,
4816 .arg4_type
= ARG_ANYTHING
,
4819 BPF_CALL_3(bpf_skb_set_tunnel_opt
, struct sk_buff
*, skb
,
4820 const u8
*, from
, u32
, size
)
4822 struct ip_tunnel_info
*info
= skb_tunnel_info(skb
);
4823 const struct metadata_dst
*md
= this_cpu_ptr(md_dst
);
4825 if (unlikely(info
!= &md
->u
.tun_info
|| (size
& (sizeof(u32
) - 1))))
4827 if (unlikely(size
> IP_TUNNEL_OPTS_MAX
))
4830 ip_tunnel_info_opts_set(info
, from
, size
, TUNNEL_OPTIONS_PRESENT
);
4835 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto
= {
4836 .func
= bpf_skb_set_tunnel_opt
,
4838 .ret_type
= RET_INTEGER
,
4839 .arg1_type
= ARG_PTR_TO_CTX
,
4840 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
4841 .arg3_type
= ARG_CONST_SIZE
,
4844 static const struct bpf_func_proto
*
4845 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which
)
4848 struct metadata_dst __percpu
*tmp
;
4850 tmp
= metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX
,
4855 if (cmpxchg(&md_dst
, NULL
, tmp
))
4856 metadata_dst_free_percpu(tmp
);
4860 case BPF_FUNC_skb_set_tunnel_key
:
4861 return &bpf_skb_set_tunnel_key_proto
;
4862 case BPF_FUNC_skb_set_tunnel_opt
:
4863 return &bpf_skb_set_tunnel_opt_proto
;
4869 BPF_CALL_3(bpf_skb_under_cgroup
, struct sk_buff
*, skb
, struct bpf_map
*, map
,
4872 struct bpf_array
*array
= container_of(map
, struct bpf_array
, map
);
4873 struct cgroup
*cgrp
;
4876 sk
= skb_to_full_sk(skb
);
4877 if (!sk
|| !sk_fullsock(sk
))
4879 if (unlikely(idx
>= array
->map
.max_entries
))
4882 cgrp
= READ_ONCE(array
->ptrs
[idx
]);
4883 if (unlikely(!cgrp
))
4886 return sk_under_cgroup_hierarchy(sk
, cgrp
);
4889 static const struct bpf_func_proto bpf_skb_under_cgroup_proto
= {
4890 .func
= bpf_skb_under_cgroup
,
4892 .ret_type
= RET_INTEGER
,
4893 .arg1_type
= ARG_PTR_TO_CTX
,
4894 .arg2_type
= ARG_CONST_MAP_PTR
,
4895 .arg3_type
= ARG_ANYTHING
,
4898 #ifdef CONFIG_SOCK_CGROUP_DATA
4899 static inline u64
__bpf_sk_cgroup_id(struct sock
*sk
)
4901 struct cgroup
*cgrp
;
4903 sk
= sk_to_full_sk(sk
);
4904 if (!sk
|| !sk_fullsock(sk
))
4907 cgrp
= sock_cgroup_ptr(&sk
->sk_cgrp_data
);
4908 return cgroup_id(cgrp
);
4911 BPF_CALL_1(bpf_skb_cgroup_id
, const struct sk_buff
*, skb
)
4913 return __bpf_sk_cgroup_id(skb
->sk
);
4916 static const struct bpf_func_proto bpf_skb_cgroup_id_proto
= {
4917 .func
= bpf_skb_cgroup_id
,
4919 .ret_type
= RET_INTEGER
,
4920 .arg1_type
= ARG_PTR_TO_CTX
,
4923 static inline u64
__bpf_sk_ancestor_cgroup_id(struct sock
*sk
,
4926 struct cgroup
*ancestor
;
4927 struct cgroup
*cgrp
;
4929 sk
= sk_to_full_sk(sk
);
4930 if (!sk
|| !sk_fullsock(sk
))
4933 cgrp
= sock_cgroup_ptr(&sk
->sk_cgrp_data
);
4934 ancestor
= cgroup_ancestor(cgrp
, ancestor_level
);
4938 return cgroup_id(ancestor
);
4941 BPF_CALL_2(bpf_skb_ancestor_cgroup_id
, const struct sk_buff
*, skb
, int,
4944 return __bpf_sk_ancestor_cgroup_id(skb
->sk
, ancestor_level
);
4947 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto
= {
4948 .func
= bpf_skb_ancestor_cgroup_id
,
4950 .ret_type
= RET_INTEGER
,
4951 .arg1_type
= ARG_PTR_TO_CTX
,
4952 .arg2_type
= ARG_ANYTHING
,
4955 BPF_CALL_1(bpf_sk_cgroup_id
, struct sock
*, sk
)
4957 return __bpf_sk_cgroup_id(sk
);
4960 static const struct bpf_func_proto bpf_sk_cgroup_id_proto
= {
4961 .func
= bpf_sk_cgroup_id
,
4963 .ret_type
= RET_INTEGER
,
4964 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
4967 BPF_CALL_2(bpf_sk_ancestor_cgroup_id
, struct sock
*, sk
, int, ancestor_level
)
4969 return __bpf_sk_ancestor_cgroup_id(sk
, ancestor_level
);
4972 static const struct bpf_func_proto bpf_sk_ancestor_cgroup_id_proto
= {
4973 .func
= bpf_sk_ancestor_cgroup_id
,
4975 .ret_type
= RET_INTEGER
,
4976 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
4977 .arg2_type
= ARG_ANYTHING
,
4981 static unsigned long bpf_xdp_copy(void *dst
, const void *ctx
,
4982 unsigned long off
, unsigned long len
)
4984 struct xdp_buff
*xdp
= (struct xdp_buff
*)ctx
;
4986 bpf_xdp_copy_buf(xdp
, off
, dst
, len
, false);
4990 BPF_CALL_5(bpf_xdp_event_output
, struct xdp_buff
*, xdp
, struct bpf_map
*, map
,
4991 u64
, flags
, void *, meta
, u64
, meta_size
)
4993 u64 xdp_size
= (flags
& BPF_F_CTXLEN_MASK
) >> 32;
4995 if (unlikely(flags
& ~(BPF_F_CTXLEN_MASK
| BPF_F_INDEX_MASK
)))
4998 if (unlikely(!xdp
|| xdp_size
> xdp_get_buff_len(xdp
)))
5001 return bpf_event_output(map
, flags
, meta
, meta_size
, xdp
,
5002 xdp_size
, bpf_xdp_copy
);
5005 static const struct bpf_func_proto bpf_xdp_event_output_proto
= {
5006 .func
= bpf_xdp_event_output
,
5008 .ret_type
= RET_INTEGER
,
5009 .arg1_type
= ARG_PTR_TO_CTX
,
5010 .arg2_type
= ARG_CONST_MAP_PTR
,
5011 .arg3_type
= ARG_ANYTHING
,
5012 .arg4_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
5013 .arg5_type
= ARG_CONST_SIZE_OR_ZERO
,
5016 BTF_ID_LIST_SINGLE(bpf_xdp_output_btf_ids
, struct, xdp_buff
)
5018 const struct bpf_func_proto bpf_xdp_output_proto
= {
5019 .func
= bpf_xdp_event_output
,
5021 .ret_type
= RET_INTEGER
,
5022 .arg1_type
= ARG_PTR_TO_BTF_ID
,
5023 .arg1_btf_id
= &bpf_xdp_output_btf_ids
[0],
5024 .arg2_type
= ARG_CONST_MAP_PTR
,
5025 .arg3_type
= ARG_ANYTHING
,
5026 .arg4_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
5027 .arg5_type
= ARG_CONST_SIZE_OR_ZERO
,
5030 BPF_CALL_1(bpf_get_socket_cookie
, struct sk_buff
*, skb
)
5032 return skb
->sk
? __sock_gen_cookie(skb
->sk
) : 0;
5035 static const struct bpf_func_proto bpf_get_socket_cookie_proto
= {
5036 .func
= bpf_get_socket_cookie
,
5038 .ret_type
= RET_INTEGER
,
5039 .arg1_type
= ARG_PTR_TO_CTX
,
5042 BPF_CALL_1(bpf_get_socket_cookie_sock_addr
, struct bpf_sock_addr_kern
*, ctx
)
5044 return __sock_gen_cookie(ctx
->sk
);
5047 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto
= {
5048 .func
= bpf_get_socket_cookie_sock_addr
,
5050 .ret_type
= RET_INTEGER
,
5051 .arg1_type
= ARG_PTR_TO_CTX
,
5054 BPF_CALL_1(bpf_get_socket_cookie_sock
, struct sock
*, ctx
)
5056 return __sock_gen_cookie(ctx
);
5059 static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto
= {
5060 .func
= bpf_get_socket_cookie_sock
,
5062 .ret_type
= RET_INTEGER
,
5063 .arg1_type
= ARG_PTR_TO_CTX
,
5066 BPF_CALL_1(bpf_get_socket_ptr_cookie
, struct sock
*, sk
)
5068 return sk
? sock_gen_cookie(sk
) : 0;
5071 const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto
= {
5072 .func
= bpf_get_socket_ptr_cookie
,
5074 .ret_type
= RET_INTEGER
,
5075 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
| PTR_MAYBE_NULL
,
5078 BPF_CALL_1(bpf_get_socket_cookie_sock_ops
, struct bpf_sock_ops_kern
*, ctx
)
5080 return __sock_gen_cookie(ctx
->sk
);
5083 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto
= {
5084 .func
= bpf_get_socket_cookie_sock_ops
,
5086 .ret_type
= RET_INTEGER
,
5087 .arg1_type
= ARG_PTR_TO_CTX
,
5090 static u64
__bpf_get_netns_cookie(struct sock
*sk
)
5092 const struct net
*net
= sk
? sock_net(sk
) : &init_net
;
5094 return net
->net_cookie
;
5097 BPF_CALL_1(bpf_get_netns_cookie_sock
, struct sock
*, ctx
)
5099 return __bpf_get_netns_cookie(ctx
);
5102 static const struct bpf_func_proto bpf_get_netns_cookie_sock_proto
= {
5103 .func
= bpf_get_netns_cookie_sock
,
5105 .ret_type
= RET_INTEGER
,
5106 .arg1_type
= ARG_PTR_TO_CTX_OR_NULL
,
5109 BPF_CALL_1(bpf_get_netns_cookie_sock_addr
, struct bpf_sock_addr_kern
*, ctx
)
5111 return __bpf_get_netns_cookie(ctx
? ctx
->sk
: NULL
);
5114 static const struct bpf_func_proto bpf_get_netns_cookie_sock_addr_proto
= {
5115 .func
= bpf_get_netns_cookie_sock_addr
,
5117 .ret_type
= RET_INTEGER
,
5118 .arg1_type
= ARG_PTR_TO_CTX_OR_NULL
,
5121 BPF_CALL_1(bpf_get_netns_cookie_sock_ops
, struct bpf_sock_ops_kern
*, ctx
)
5123 return __bpf_get_netns_cookie(ctx
? ctx
->sk
: NULL
);
5126 static const struct bpf_func_proto bpf_get_netns_cookie_sock_ops_proto
= {
5127 .func
= bpf_get_netns_cookie_sock_ops
,
5129 .ret_type
= RET_INTEGER
,
5130 .arg1_type
= ARG_PTR_TO_CTX_OR_NULL
,
5133 BPF_CALL_1(bpf_get_netns_cookie_sk_msg
, struct sk_msg
*, ctx
)
5135 return __bpf_get_netns_cookie(ctx
? ctx
->sk
: NULL
);
5138 static const struct bpf_func_proto bpf_get_netns_cookie_sk_msg_proto
= {
5139 .func
= bpf_get_netns_cookie_sk_msg
,
5141 .ret_type
= RET_INTEGER
,
5142 .arg1_type
= ARG_PTR_TO_CTX_OR_NULL
,
5145 BPF_CALL_1(bpf_get_socket_uid
, struct sk_buff
*, skb
)
5147 struct sock
*sk
= sk_to_full_sk(skb
->sk
);
5150 if (!sk
|| !sk_fullsock(sk
))
5152 kuid
= sock_net_uid(sock_net(sk
), sk
);
5153 return from_kuid_munged(sock_net(sk
)->user_ns
, kuid
);
5156 static const struct bpf_func_proto bpf_get_socket_uid_proto
= {
5157 .func
= bpf_get_socket_uid
,
5159 .ret_type
= RET_INTEGER
,
5160 .arg1_type
= ARG_PTR_TO_CTX
,
5163 static int sol_socket_sockopt(struct sock
*sk
, int optname
,
5164 char *optval
, int *optlen
,
5176 case SO_MAX_PACING_RATE
:
5177 case SO_BINDTOIFINDEX
:
5179 if (*optlen
!= sizeof(int))
5182 case SO_BINDTODEVICE
:
5189 if (optname
== SO_BINDTODEVICE
)
5191 return sk_getsockopt(sk
, SOL_SOCKET
, optname
,
5192 KERNEL_SOCKPTR(optval
),
5193 KERNEL_SOCKPTR(optlen
));
5196 return sk_setsockopt(sk
, SOL_SOCKET
, optname
,
5197 KERNEL_SOCKPTR(optval
), *optlen
);
5200 static int bpf_sol_tcp_setsockopt(struct sock
*sk
, int optname
,
5201 char *optval
, int optlen
)
5203 struct tcp_sock
*tp
= tcp_sk(sk
);
5204 unsigned long timeout
;
5207 if (optlen
!= sizeof(int))
5210 val
= *(int *)optval
;
5212 /* Only some options are supported */
5215 if (val
<= 0 || tp
->data_segs_out
> tp
->syn_data
)
5217 tcp_snd_cwnd_set(tp
, val
);
5219 case TCP_BPF_SNDCWND_CLAMP
:
5222 tp
->snd_cwnd_clamp
= val
;
5223 tp
->snd_ssthresh
= val
;
5225 case TCP_BPF_DELACK_MAX
:
5226 timeout
= usecs_to_jiffies(val
);
5227 if (timeout
> TCP_DELACK_MAX
||
5228 timeout
< TCP_TIMEOUT_MIN
)
5230 inet_csk(sk
)->icsk_delack_max
= timeout
;
5232 case TCP_BPF_RTO_MIN
:
5233 timeout
= usecs_to_jiffies(val
);
5234 if (timeout
> TCP_RTO_MIN
||
5235 timeout
< TCP_TIMEOUT_MIN
)
5237 inet_csk(sk
)->icsk_rto_min
= timeout
;
5246 static int sol_tcp_sockopt_congestion(struct sock
*sk
, char *optval
,
5247 int *optlen
, bool getopt
)
5249 struct tcp_sock
*tp
;
5256 if (!inet_csk(sk
)->icsk_ca_ops
)
5258 /* BPF expects NULL-terminated tcp-cc string */
5259 optval
[--(*optlen
)] = '\0';
5260 return do_tcp_getsockopt(sk
, SOL_TCP
, TCP_CONGESTION
,
5261 KERNEL_SOCKPTR(optval
),
5262 KERNEL_SOCKPTR(optlen
));
5265 /* "cdg" is the only cc that alloc a ptr
5266 * in inet_csk_ca area. The bpf-tcp-cc may
5267 * overwrite this ptr after switching to cdg.
5269 if (*optlen
>= sizeof("cdg") - 1 && !strncmp("cdg", optval
, *optlen
))
5272 /* It stops this looping
5274 * .init => bpf_setsockopt(tcp_cc) => .init =>
5275 * bpf_setsockopt(tcp_cc)" => .init => ....
5277 * The second bpf_setsockopt(tcp_cc) is not allowed
5278 * in order to break the loop when both .init
5279 * are the same bpf prog.
5281 * This applies even the second bpf_setsockopt(tcp_cc)
5282 * does not cause a loop. This limits only the first
5283 * '.init' can call bpf_setsockopt(TCP_CONGESTION) to
5284 * pick a fallback cc (eg. peer does not support ECN)
5285 * and the second '.init' cannot fallback to
5289 if (tp
->bpf_chg_cc_inprogress
)
5292 tp
->bpf_chg_cc_inprogress
= 1;
5293 ret
= do_tcp_setsockopt(sk
, SOL_TCP
, TCP_CONGESTION
,
5294 KERNEL_SOCKPTR(optval
), *optlen
);
5295 tp
->bpf_chg_cc_inprogress
= 0;
5299 static int sol_tcp_sockopt(struct sock
*sk
, int optname
,
5300 char *optval
, int *optlen
,
5303 if (sk
->sk_protocol
!= IPPROTO_TCP
)
5313 case TCP_WINDOW_CLAMP
:
5314 case TCP_THIN_LINEAR_TIMEOUTS
:
5315 case TCP_USER_TIMEOUT
:
5316 case TCP_NOTSENT_LOWAT
:
5318 if (*optlen
!= sizeof(int))
5321 case TCP_CONGESTION
:
5322 return sol_tcp_sockopt_congestion(sk
, optval
, optlen
, getopt
);
5330 return bpf_sol_tcp_setsockopt(sk
, optname
, optval
, *optlen
);
5334 if (optname
== TCP_SAVED_SYN
) {
5335 struct tcp_sock
*tp
= tcp_sk(sk
);
5337 if (!tp
->saved_syn
||
5338 *optlen
> tcp_saved_syn_len(tp
->saved_syn
))
5340 memcpy(optval
, tp
->saved_syn
->data
, *optlen
);
5341 /* It cannot free tp->saved_syn here because it
5342 * does not know if the user space still needs it.
5347 return do_tcp_getsockopt(sk
, SOL_TCP
, optname
,
5348 KERNEL_SOCKPTR(optval
),
5349 KERNEL_SOCKPTR(optlen
));
5352 return do_tcp_setsockopt(sk
, SOL_TCP
, optname
,
5353 KERNEL_SOCKPTR(optval
), *optlen
);
5356 static int sol_ip_sockopt(struct sock
*sk
, int optname
,
5357 char *optval
, int *optlen
,
5360 if (sk
->sk_family
!= AF_INET
)
5365 if (*optlen
!= sizeof(int))
5373 return do_ip_getsockopt(sk
, SOL_IP
, optname
,
5374 KERNEL_SOCKPTR(optval
),
5375 KERNEL_SOCKPTR(optlen
));
5377 return do_ip_setsockopt(sk
, SOL_IP
, optname
,
5378 KERNEL_SOCKPTR(optval
), *optlen
);
5381 static int sol_ipv6_sockopt(struct sock
*sk
, int optname
,
5382 char *optval
, int *optlen
,
5385 if (sk
->sk_family
!= AF_INET6
)
5390 case IPV6_AUTOFLOWLABEL
:
5391 if (*optlen
!= sizeof(int))
5399 return ipv6_bpf_stub
->ipv6_getsockopt(sk
, SOL_IPV6
, optname
,
5400 KERNEL_SOCKPTR(optval
),
5401 KERNEL_SOCKPTR(optlen
));
5403 return ipv6_bpf_stub
->ipv6_setsockopt(sk
, SOL_IPV6
, optname
,
5404 KERNEL_SOCKPTR(optval
), *optlen
);
5407 static int __bpf_setsockopt(struct sock
*sk
, int level
, int optname
,
5408 char *optval
, int optlen
)
5410 if (!sk_fullsock(sk
))
5413 if (level
== SOL_SOCKET
)
5414 return sol_socket_sockopt(sk
, optname
, optval
, &optlen
, false);
5415 else if (IS_ENABLED(CONFIG_INET
) && level
== SOL_IP
)
5416 return sol_ip_sockopt(sk
, optname
, optval
, &optlen
, false);
5417 else if (IS_ENABLED(CONFIG_IPV6
) && level
== SOL_IPV6
)
5418 return sol_ipv6_sockopt(sk
, optname
, optval
, &optlen
, false);
5419 else if (IS_ENABLED(CONFIG_INET
) && level
== SOL_TCP
)
5420 return sol_tcp_sockopt(sk
, optname
, optval
, &optlen
, false);
5425 static int _bpf_setsockopt(struct sock
*sk
, int level
, int optname
,
5426 char *optval
, int optlen
)
5428 if (sk_fullsock(sk
))
5429 sock_owned_by_me(sk
);
5430 return __bpf_setsockopt(sk
, level
, optname
, optval
, optlen
);
5433 static int __bpf_getsockopt(struct sock
*sk
, int level
, int optname
,
5434 char *optval
, int optlen
)
5436 int err
, saved_optlen
= optlen
;
5438 if (!sk_fullsock(sk
)) {
5443 if (level
== SOL_SOCKET
)
5444 err
= sol_socket_sockopt(sk
, optname
, optval
, &optlen
, true);
5445 else if (IS_ENABLED(CONFIG_INET
) && level
== SOL_TCP
)
5446 err
= sol_tcp_sockopt(sk
, optname
, optval
, &optlen
, true);
5447 else if (IS_ENABLED(CONFIG_INET
) && level
== SOL_IP
)
5448 err
= sol_ip_sockopt(sk
, optname
, optval
, &optlen
, true);
5449 else if (IS_ENABLED(CONFIG_IPV6
) && level
== SOL_IPV6
)
5450 err
= sol_ipv6_sockopt(sk
, optname
, optval
, &optlen
, true);
5457 if (optlen
< saved_optlen
)
5458 memset(optval
+ optlen
, 0, saved_optlen
- optlen
);
5462 static int _bpf_getsockopt(struct sock
*sk
, int level
, int optname
,
5463 char *optval
, int optlen
)
5465 if (sk_fullsock(sk
))
5466 sock_owned_by_me(sk
);
5467 return __bpf_getsockopt(sk
, level
, optname
, optval
, optlen
);
5470 BPF_CALL_5(bpf_sk_setsockopt
, struct sock
*, sk
, int, level
,
5471 int, optname
, char *, optval
, int, optlen
)
5473 return _bpf_setsockopt(sk
, level
, optname
, optval
, optlen
);
5476 const struct bpf_func_proto bpf_sk_setsockopt_proto
= {
5477 .func
= bpf_sk_setsockopt
,
5479 .ret_type
= RET_INTEGER
,
5480 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
5481 .arg2_type
= ARG_ANYTHING
,
5482 .arg3_type
= ARG_ANYTHING
,
5483 .arg4_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
5484 .arg5_type
= ARG_CONST_SIZE
,
5487 BPF_CALL_5(bpf_sk_getsockopt
, struct sock
*, sk
, int, level
,
5488 int, optname
, char *, optval
, int, optlen
)
5490 return _bpf_getsockopt(sk
, level
, optname
, optval
, optlen
);
5493 const struct bpf_func_proto bpf_sk_getsockopt_proto
= {
5494 .func
= bpf_sk_getsockopt
,
5496 .ret_type
= RET_INTEGER
,
5497 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
5498 .arg2_type
= ARG_ANYTHING
,
5499 .arg3_type
= ARG_ANYTHING
,
5500 .arg4_type
= ARG_PTR_TO_UNINIT_MEM
,
5501 .arg5_type
= ARG_CONST_SIZE
,
5504 BPF_CALL_5(bpf_unlocked_sk_setsockopt
, struct sock
*, sk
, int, level
,
5505 int, optname
, char *, optval
, int, optlen
)
5507 return __bpf_setsockopt(sk
, level
, optname
, optval
, optlen
);
5510 const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto
= {
5511 .func
= bpf_unlocked_sk_setsockopt
,
5513 .ret_type
= RET_INTEGER
,
5514 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
5515 .arg2_type
= ARG_ANYTHING
,
5516 .arg3_type
= ARG_ANYTHING
,
5517 .arg4_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
5518 .arg5_type
= ARG_CONST_SIZE
,
5521 BPF_CALL_5(bpf_unlocked_sk_getsockopt
, struct sock
*, sk
, int, level
,
5522 int, optname
, char *, optval
, int, optlen
)
5524 return __bpf_getsockopt(sk
, level
, optname
, optval
, optlen
);
5527 const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto
= {
5528 .func
= bpf_unlocked_sk_getsockopt
,
5530 .ret_type
= RET_INTEGER
,
5531 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
5532 .arg2_type
= ARG_ANYTHING
,
5533 .arg3_type
= ARG_ANYTHING
,
5534 .arg4_type
= ARG_PTR_TO_UNINIT_MEM
,
5535 .arg5_type
= ARG_CONST_SIZE
,
5538 BPF_CALL_5(bpf_sock_addr_setsockopt
, struct bpf_sock_addr_kern
*, ctx
,
5539 int, level
, int, optname
, char *, optval
, int, optlen
)
5541 return _bpf_setsockopt(ctx
->sk
, level
, optname
, optval
, optlen
);
5544 static const struct bpf_func_proto bpf_sock_addr_setsockopt_proto
= {
5545 .func
= bpf_sock_addr_setsockopt
,
5547 .ret_type
= RET_INTEGER
,
5548 .arg1_type
= ARG_PTR_TO_CTX
,
5549 .arg2_type
= ARG_ANYTHING
,
5550 .arg3_type
= ARG_ANYTHING
,
5551 .arg4_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
5552 .arg5_type
= ARG_CONST_SIZE
,
5555 BPF_CALL_5(bpf_sock_addr_getsockopt
, struct bpf_sock_addr_kern
*, ctx
,
5556 int, level
, int, optname
, char *, optval
, int, optlen
)
5558 return _bpf_getsockopt(ctx
->sk
, level
, optname
, optval
, optlen
);
5561 static const struct bpf_func_proto bpf_sock_addr_getsockopt_proto
= {
5562 .func
= bpf_sock_addr_getsockopt
,
5564 .ret_type
= RET_INTEGER
,
5565 .arg1_type
= ARG_PTR_TO_CTX
,
5566 .arg2_type
= ARG_ANYTHING
,
5567 .arg3_type
= ARG_ANYTHING
,
5568 .arg4_type
= ARG_PTR_TO_UNINIT_MEM
,
5569 .arg5_type
= ARG_CONST_SIZE
,
5572 BPF_CALL_5(bpf_sock_ops_setsockopt
, struct bpf_sock_ops_kern
*, bpf_sock
,
5573 int, level
, int, optname
, char *, optval
, int, optlen
)
5575 return _bpf_setsockopt(bpf_sock
->sk
, level
, optname
, optval
, optlen
);
5578 static const struct bpf_func_proto bpf_sock_ops_setsockopt_proto
= {
5579 .func
= bpf_sock_ops_setsockopt
,
5581 .ret_type
= RET_INTEGER
,
5582 .arg1_type
= ARG_PTR_TO_CTX
,
5583 .arg2_type
= ARG_ANYTHING
,
5584 .arg3_type
= ARG_ANYTHING
,
5585 .arg4_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
5586 .arg5_type
= ARG_CONST_SIZE
,
5589 static int bpf_sock_ops_get_syn(struct bpf_sock_ops_kern
*bpf_sock
,
5590 int optname
, const u8
**start
)
5592 struct sk_buff
*syn_skb
= bpf_sock
->syn_skb
;
5593 const u8
*hdr_start
;
5597 /* sk is a request_sock here */
5599 if (optname
== TCP_BPF_SYN
) {
5600 hdr_start
= syn_skb
->data
;
5601 ret
= tcp_hdrlen(syn_skb
);
5602 } else if (optname
== TCP_BPF_SYN_IP
) {
5603 hdr_start
= skb_network_header(syn_skb
);
5604 ret
= skb_network_header_len(syn_skb
) +
5605 tcp_hdrlen(syn_skb
);
5607 /* optname == TCP_BPF_SYN_MAC */
5608 hdr_start
= skb_mac_header(syn_skb
);
5609 ret
= skb_mac_header_len(syn_skb
) +
5610 skb_network_header_len(syn_skb
) +
5611 tcp_hdrlen(syn_skb
);
5614 struct sock
*sk
= bpf_sock
->sk
;
5615 struct saved_syn
*saved_syn
;
5617 if (sk
->sk_state
== TCP_NEW_SYN_RECV
)
5618 /* synack retransmit. bpf_sock->syn_skb will
5619 * not be available. It has to resort to
5620 * saved_syn (if it is saved).
5622 saved_syn
= inet_reqsk(sk
)->saved_syn
;
5624 saved_syn
= tcp_sk(sk
)->saved_syn
;
5629 if (optname
== TCP_BPF_SYN
) {
5630 hdr_start
= saved_syn
->data
+
5631 saved_syn
->mac_hdrlen
+
5632 saved_syn
->network_hdrlen
;
5633 ret
= saved_syn
->tcp_hdrlen
;
5634 } else if (optname
== TCP_BPF_SYN_IP
) {
5635 hdr_start
= saved_syn
->data
+
5636 saved_syn
->mac_hdrlen
;
5637 ret
= saved_syn
->network_hdrlen
+
5638 saved_syn
->tcp_hdrlen
;
5640 /* optname == TCP_BPF_SYN_MAC */
5642 /* TCP_SAVE_SYN may not have saved the mac hdr */
5643 if (!saved_syn
->mac_hdrlen
)
5646 hdr_start
= saved_syn
->data
;
5647 ret
= saved_syn
->mac_hdrlen
+
5648 saved_syn
->network_hdrlen
+
5649 saved_syn
->tcp_hdrlen
;
5657 BPF_CALL_5(bpf_sock_ops_getsockopt
, struct bpf_sock_ops_kern
*, bpf_sock
,
5658 int, level
, int, optname
, char *, optval
, int, optlen
)
5660 if (IS_ENABLED(CONFIG_INET
) && level
== SOL_TCP
&&
5661 optname
>= TCP_BPF_SYN
&& optname
<= TCP_BPF_SYN_MAC
) {
5662 int ret
, copy_len
= 0;
5665 ret
= bpf_sock_ops_get_syn(bpf_sock
, optname
, &start
);
5668 if (optlen
< copy_len
) {
5673 memcpy(optval
, start
, copy_len
);
5676 /* Zero out unused buffer at the end */
5677 memset(optval
+ copy_len
, 0, optlen
- copy_len
);
5682 return _bpf_getsockopt(bpf_sock
->sk
, level
, optname
, optval
, optlen
);
5685 static const struct bpf_func_proto bpf_sock_ops_getsockopt_proto
= {
5686 .func
= bpf_sock_ops_getsockopt
,
5688 .ret_type
= RET_INTEGER
,
5689 .arg1_type
= ARG_PTR_TO_CTX
,
5690 .arg2_type
= ARG_ANYTHING
,
5691 .arg3_type
= ARG_ANYTHING
,
5692 .arg4_type
= ARG_PTR_TO_UNINIT_MEM
,
5693 .arg5_type
= ARG_CONST_SIZE
,
5696 BPF_CALL_2(bpf_sock_ops_cb_flags_set
, struct bpf_sock_ops_kern
*, bpf_sock
,
5699 struct sock
*sk
= bpf_sock
->sk
;
5700 int val
= argval
& BPF_SOCK_OPS_ALL_CB_FLAGS
;
5702 if (!IS_ENABLED(CONFIG_INET
) || !sk_fullsock(sk
))
5705 tcp_sk(sk
)->bpf_sock_ops_cb_flags
= val
;
5707 return argval
& (~BPF_SOCK_OPS_ALL_CB_FLAGS
);
5710 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto
= {
5711 .func
= bpf_sock_ops_cb_flags_set
,
5713 .ret_type
= RET_INTEGER
,
5714 .arg1_type
= ARG_PTR_TO_CTX
,
5715 .arg2_type
= ARG_ANYTHING
,
5718 const struct ipv6_bpf_stub
*ipv6_bpf_stub __read_mostly
;
5719 EXPORT_SYMBOL_GPL(ipv6_bpf_stub
);
5721 BPF_CALL_3(bpf_bind
, struct bpf_sock_addr_kern
*, ctx
, struct sockaddr
*, addr
,
5725 struct sock
*sk
= ctx
->sk
;
5726 u32 flags
= BIND_FROM_BPF
;
5730 if (addr_len
< offsetofend(struct sockaddr
, sa_family
))
5732 if (addr
->sa_family
== AF_INET
) {
5733 if (addr_len
< sizeof(struct sockaddr_in
))
5735 if (((struct sockaddr_in
*)addr
)->sin_port
== htons(0))
5736 flags
|= BIND_FORCE_ADDRESS_NO_PORT
;
5737 return __inet_bind(sk
, addr
, addr_len
, flags
);
5738 #if IS_ENABLED(CONFIG_IPV6)
5739 } else if (addr
->sa_family
== AF_INET6
) {
5740 if (addr_len
< SIN6_LEN_RFC2133
)
5742 if (((struct sockaddr_in6
*)addr
)->sin6_port
== htons(0))
5743 flags
|= BIND_FORCE_ADDRESS_NO_PORT
;
5744 /* ipv6_bpf_stub cannot be NULL, since it's called from
5745 * bpf_cgroup_inet6_connect hook and ipv6 is already loaded
5747 return ipv6_bpf_stub
->inet6_bind(sk
, addr
, addr_len
, flags
);
5748 #endif /* CONFIG_IPV6 */
5750 #endif /* CONFIG_INET */
5752 return -EAFNOSUPPORT
;
5755 static const struct bpf_func_proto bpf_bind_proto
= {
5758 .ret_type
= RET_INTEGER
,
5759 .arg1_type
= ARG_PTR_TO_CTX
,
5760 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
5761 .arg3_type
= ARG_CONST_SIZE
,
5766 #if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
5767 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
5769 struct metadata_dst __percpu
*xfrm_bpf_md_dst
;
5770 EXPORT_SYMBOL_GPL(xfrm_bpf_md_dst
);
5774 BPF_CALL_5(bpf_skb_get_xfrm_state
, struct sk_buff
*, skb
, u32
, index
,
5775 struct bpf_xfrm_state
*, to
, u32
, size
, u64
, flags
)
5777 const struct sec_path
*sp
= skb_sec_path(skb
);
5778 const struct xfrm_state
*x
;
5780 if (!sp
|| unlikely(index
>= sp
->len
|| flags
))
5783 x
= sp
->xvec
[index
];
5785 if (unlikely(size
!= sizeof(struct bpf_xfrm_state
)))
5788 to
->reqid
= x
->props
.reqid
;
5789 to
->spi
= x
->id
.spi
;
5790 to
->family
= x
->props
.family
;
5793 if (to
->family
== AF_INET6
) {
5794 memcpy(to
->remote_ipv6
, x
->props
.saddr
.a6
,
5795 sizeof(to
->remote_ipv6
));
5797 to
->remote_ipv4
= x
->props
.saddr
.a4
;
5798 memset(&to
->remote_ipv6
[1], 0, sizeof(__u32
) * 3);
5803 memset(to
, 0, size
);
5807 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto
= {
5808 .func
= bpf_skb_get_xfrm_state
,
5810 .ret_type
= RET_INTEGER
,
5811 .arg1_type
= ARG_PTR_TO_CTX
,
5812 .arg2_type
= ARG_ANYTHING
,
5813 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
5814 .arg4_type
= ARG_CONST_SIZE
,
5815 .arg5_type
= ARG_ANYTHING
,
5819 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6)
5820 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup
*params
, u32 mtu
)
5822 params
->h_vlan_TCI
= 0;
5823 params
->h_vlan_proto
= 0;
5825 params
->mtu_result
= mtu
; /* union with tot_len */
5831 #if IS_ENABLED(CONFIG_INET)
5832 static int bpf_ipv4_fib_lookup(struct net
*net
, struct bpf_fib_lookup
*params
,
5833 u32 flags
, bool check_mtu
)
5835 struct fib_nh_common
*nhc
;
5836 struct in_device
*in_dev
;
5837 struct neighbour
*neigh
;
5838 struct net_device
*dev
;
5839 struct fib_result res
;
5844 dev
= dev_get_by_index_rcu(net
, params
->ifindex
);
5848 /* verify forwarding is enabled on this interface */
5849 in_dev
= __in_dev_get_rcu(dev
);
5850 if (unlikely(!in_dev
|| !IN_DEV_FORWARD(in_dev
)))
5851 return BPF_FIB_LKUP_RET_FWD_DISABLED
;
5853 if (flags
& BPF_FIB_LOOKUP_OUTPUT
) {
5855 fl4
.flowi4_oif
= params
->ifindex
;
5857 fl4
.flowi4_iif
= params
->ifindex
;
5860 fl4
.flowi4_tos
= params
->tos
& IPTOS_RT_MASK
;
5861 fl4
.flowi4_scope
= RT_SCOPE_UNIVERSE
;
5862 fl4
.flowi4_flags
= 0;
5864 fl4
.flowi4_proto
= params
->l4_protocol
;
5865 fl4
.daddr
= params
->ipv4_dst
;
5866 fl4
.saddr
= params
->ipv4_src
;
5867 fl4
.fl4_sport
= params
->sport
;
5868 fl4
.fl4_dport
= params
->dport
;
5869 fl4
.flowi4_multipath_hash
= 0;
5871 if (flags
& BPF_FIB_LOOKUP_DIRECT
) {
5872 u32 tbid
= l3mdev_fib_table_rcu(dev
) ? : RT_TABLE_MAIN
;
5873 struct fib_table
*tb
;
5875 if (flags
& BPF_FIB_LOOKUP_TBID
) {
5876 tbid
= params
->tbid
;
5877 /* zero out for vlan output */
5881 tb
= fib_get_table(net
, tbid
);
5883 return BPF_FIB_LKUP_RET_NOT_FWDED
;
5885 err
= fib_table_lookup(tb
, &fl4
, &res
, FIB_LOOKUP_NOREF
);
5887 fl4
.flowi4_mark
= 0;
5888 fl4
.flowi4_secid
= 0;
5889 fl4
.flowi4_tun_key
.tun_id
= 0;
5890 fl4
.flowi4_uid
= sock_net_uid(net
, NULL
);
5892 err
= fib_lookup(net
, &fl4
, &res
, FIB_LOOKUP_NOREF
);
5896 /* map fib lookup errors to RTN_ type */
5898 return BPF_FIB_LKUP_RET_BLACKHOLE
;
5899 if (err
== -EHOSTUNREACH
)
5900 return BPF_FIB_LKUP_RET_UNREACHABLE
;
5902 return BPF_FIB_LKUP_RET_PROHIBIT
;
5904 return BPF_FIB_LKUP_RET_NOT_FWDED
;
5907 if (res
.type
!= RTN_UNICAST
)
5908 return BPF_FIB_LKUP_RET_NOT_FWDED
;
5910 if (fib_info_num_path(res
.fi
) > 1)
5911 fib_select_path(net
, &res
, &fl4
, NULL
);
5914 mtu
= ip_mtu_from_fib_result(&res
, params
->ipv4_dst
);
5915 if (params
->tot_len
> mtu
) {
5916 params
->mtu_result
= mtu
; /* union with tot_len */
5917 return BPF_FIB_LKUP_RET_FRAG_NEEDED
;
5923 /* do not handle lwt encaps right now */
5924 if (nhc
->nhc_lwtstate
)
5925 return BPF_FIB_LKUP_RET_UNSUPP_LWT
;
5929 params
->rt_metric
= res
.fi
->fib_priority
;
5930 params
->ifindex
= dev
->ifindex
;
5932 if (flags
& BPF_FIB_LOOKUP_SRC
)
5933 params
->ipv4_src
= fib_result_prefsrc(net
, &res
);
5935 /* xdp and cls_bpf programs are run in RCU-bh so
5936 * rcu_read_lock_bh is not needed here
5938 if (likely(nhc
->nhc_gw_family
!= AF_INET6
)) {
5939 if (nhc
->nhc_gw_family
)
5940 params
->ipv4_dst
= nhc
->nhc_gw
.ipv4
;
5942 struct in6_addr
*dst
= (struct in6_addr
*)params
->ipv6_dst
;
5944 params
->family
= AF_INET6
;
5945 *dst
= nhc
->nhc_gw
.ipv6
;
5948 if (flags
& BPF_FIB_LOOKUP_SKIP_NEIGH
)
5949 goto set_fwd_params
;
5951 if (likely(nhc
->nhc_gw_family
!= AF_INET6
))
5952 neigh
= __ipv4_neigh_lookup_noref(dev
,
5953 (__force u32
)params
->ipv4_dst
);
5955 neigh
= __ipv6_neigh_lookup_noref_stub(dev
, params
->ipv6_dst
);
5957 if (!neigh
|| !(READ_ONCE(neigh
->nud_state
) & NUD_VALID
))
5958 return BPF_FIB_LKUP_RET_NO_NEIGH
;
5959 memcpy(params
->dmac
, neigh
->ha
, ETH_ALEN
);
5960 memcpy(params
->smac
, dev
->dev_addr
, ETH_ALEN
);
5963 return bpf_fib_set_fwd_params(params
, mtu
);
5967 #if IS_ENABLED(CONFIG_IPV6)
5968 static int bpf_ipv6_fib_lookup(struct net
*net
, struct bpf_fib_lookup
*params
,
5969 u32 flags
, bool check_mtu
)
5971 struct in6_addr
*src
= (struct in6_addr
*) params
->ipv6_src
;
5972 struct in6_addr
*dst
= (struct in6_addr
*) params
->ipv6_dst
;
5973 struct fib6_result res
= {};
5974 struct neighbour
*neigh
;
5975 struct net_device
*dev
;
5976 struct inet6_dev
*idev
;
5982 /* link local addresses are never forwarded */
5983 if (rt6_need_strict(dst
) || rt6_need_strict(src
))
5984 return BPF_FIB_LKUP_RET_NOT_FWDED
;
5986 dev
= dev_get_by_index_rcu(net
, params
->ifindex
);
5990 idev
= __in6_dev_get_safely(dev
);
5991 if (unlikely(!idev
|| !idev
->cnf
.forwarding
))
5992 return BPF_FIB_LKUP_RET_FWD_DISABLED
;
5994 if (flags
& BPF_FIB_LOOKUP_OUTPUT
) {
5996 oif
= fl6
.flowi6_oif
= params
->ifindex
;
5998 oif
= fl6
.flowi6_iif
= params
->ifindex
;
6000 strict
= RT6_LOOKUP_F_HAS_SADDR
;
6002 fl6
.flowlabel
= params
->flowinfo
;
6003 fl6
.flowi6_scope
= 0;
6004 fl6
.flowi6_flags
= 0;
6007 fl6
.flowi6_proto
= params
->l4_protocol
;
6010 fl6
.fl6_sport
= params
->sport
;
6011 fl6
.fl6_dport
= params
->dport
;
6013 if (flags
& BPF_FIB_LOOKUP_DIRECT
) {
6014 u32 tbid
= l3mdev_fib_table_rcu(dev
) ? : RT_TABLE_MAIN
;
6015 struct fib6_table
*tb
;
6017 if (flags
& BPF_FIB_LOOKUP_TBID
) {
6018 tbid
= params
->tbid
;
6019 /* zero out for vlan output */
6023 tb
= ipv6_stub
->fib6_get_table(net
, tbid
);
6025 return BPF_FIB_LKUP_RET_NOT_FWDED
;
6027 err
= ipv6_stub
->fib6_table_lookup(net
, tb
, oif
, &fl6
, &res
,
6030 fl6
.flowi6_mark
= 0;
6031 fl6
.flowi6_secid
= 0;
6032 fl6
.flowi6_tun_key
.tun_id
= 0;
6033 fl6
.flowi6_uid
= sock_net_uid(net
, NULL
);
6035 err
= ipv6_stub
->fib6_lookup(net
, oif
, &fl6
, &res
, strict
);
6038 if (unlikely(err
|| IS_ERR_OR_NULL(res
.f6i
) ||
6039 res
.f6i
== net
->ipv6
.fib6_null_entry
))
6040 return BPF_FIB_LKUP_RET_NOT_FWDED
;
6042 switch (res
.fib6_type
) {
6043 /* only unicast is forwarded */
6047 return BPF_FIB_LKUP_RET_BLACKHOLE
;
6048 case RTN_UNREACHABLE
:
6049 return BPF_FIB_LKUP_RET_UNREACHABLE
;
6051 return BPF_FIB_LKUP_RET_PROHIBIT
;
6053 return BPF_FIB_LKUP_RET_NOT_FWDED
;
6056 ipv6_stub
->fib6_select_path(net
, &res
, &fl6
, fl6
.flowi6_oif
,
6057 fl6
.flowi6_oif
!= 0, NULL
, strict
);
6060 mtu
= ipv6_stub
->ip6_mtu_from_fib6(&res
, dst
, src
);
6061 if (params
->tot_len
> mtu
) {
6062 params
->mtu_result
= mtu
; /* union with tot_len */
6063 return BPF_FIB_LKUP_RET_FRAG_NEEDED
;
6067 if (res
.nh
->fib_nh_lws
)
6068 return BPF_FIB_LKUP_RET_UNSUPP_LWT
;
6070 if (res
.nh
->fib_nh_gw_family
)
6071 *dst
= res
.nh
->fib_nh_gw6
;
6073 dev
= res
.nh
->fib_nh_dev
;
6074 params
->rt_metric
= res
.f6i
->fib6_metric
;
6075 params
->ifindex
= dev
->ifindex
;
6077 if (flags
& BPF_FIB_LOOKUP_SRC
) {
6078 if (res
.f6i
->fib6_prefsrc
.plen
) {
6079 *src
= res
.f6i
->fib6_prefsrc
.addr
;
6081 err
= ipv6_bpf_stub
->ipv6_dev_get_saddr(net
, dev
,
6085 return BPF_FIB_LKUP_RET_NO_SRC_ADDR
;
6089 if (flags
& BPF_FIB_LOOKUP_SKIP_NEIGH
)
6090 goto set_fwd_params
;
6092 /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is
6095 neigh
= __ipv6_neigh_lookup_noref_stub(dev
, dst
);
6096 if (!neigh
|| !(READ_ONCE(neigh
->nud_state
) & NUD_VALID
))
6097 return BPF_FIB_LKUP_RET_NO_NEIGH
;
6098 memcpy(params
->dmac
, neigh
->ha
, ETH_ALEN
);
6099 memcpy(params
->smac
, dev
->dev_addr
, ETH_ALEN
);
6102 return bpf_fib_set_fwd_params(params
, mtu
);
6106 #define BPF_FIB_LOOKUP_MASK (BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT | \
6107 BPF_FIB_LOOKUP_SKIP_NEIGH | BPF_FIB_LOOKUP_TBID | \
6110 BPF_CALL_4(bpf_xdp_fib_lookup
, struct xdp_buff
*, ctx
,
6111 struct bpf_fib_lookup
*, params
, int, plen
, u32
, flags
)
6113 if (plen
< sizeof(*params
))
6116 if (flags
& ~BPF_FIB_LOOKUP_MASK
)
6119 switch (params
->family
) {
6120 #if IS_ENABLED(CONFIG_INET)
6122 return bpf_ipv4_fib_lookup(dev_net(ctx
->rxq
->dev
), params
,
6125 #if IS_ENABLED(CONFIG_IPV6)
6127 return bpf_ipv6_fib_lookup(dev_net(ctx
->rxq
->dev
), params
,
6131 return -EAFNOSUPPORT
;
6134 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto
= {
6135 .func
= bpf_xdp_fib_lookup
,
6137 .ret_type
= RET_INTEGER
,
6138 .arg1_type
= ARG_PTR_TO_CTX
,
6139 .arg2_type
= ARG_PTR_TO_MEM
,
6140 .arg3_type
= ARG_CONST_SIZE
,
6141 .arg4_type
= ARG_ANYTHING
,
6144 BPF_CALL_4(bpf_skb_fib_lookup
, struct sk_buff
*, skb
,
6145 struct bpf_fib_lookup
*, params
, int, plen
, u32
, flags
)
6147 struct net
*net
= dev_net(skb
->dev
);
6148 int rc
= -EAFNOSUPPORT
;
6149 bool check_mtu
= false;
6151 if (plen
< sizeof(*params
))
6154 if (flags
& ~BPF_FIB_LOOKUP_MASK
)
6157 if (params
->tot_len
)
6160 switch (params
->family
) {
6161 #if IS_ENABLED(CONFIG_INET)
6163 rc
= bpf_ipv4_fib_lookup(net
, params
, flags
, check_mtu
);
6166 #if IS_ENABLED(CONFIG_IPV6)
6168 rc
= bpf_ipv6_fib_lookup(net
, params
, flags
, check_mtu
);
6173 if (rc
== BPF_FIB_LKUP_RET_SUCCESS
&& !check_mtu
) {
6174 struct net_device
*dev
;
6176 /* When tot_len isn't provided by user, check skb
6177 * against MTU of FIB lookup resulting net_device
6179 dev
= dev_get_by_index_rcu(net
, params
->ifindex
);
6180 if (!is_skb_forwardable(dev
, skb
))
6181 rc
= BPF_FIB_LKUP_RET_FRAG_NEEDED
;
6183 params
->mtu_result
= dev
->mtu
; /* union with tot_len */
6189 static const struct bpf_func_proto bpf_skb_fib_lookup_proto
= {
6190 .func
= bpf_skb_fib_lookup
,
6192 .ret_type
= RET_INTEGER
,
6193 .arg1_type
= ARG_PTR_TO_CTX
,
6194 .arg2_type
= ARG_PTR_TO_MEM
,
6195 .arg3_type
= ARG_CONST_SIZE
,
6196 .arg4_type
= ARG_ANYTHING
,
6199 static struct net_device
*__dev_via_ifindex(struct net_device
*dev_curr
,
6202 struct net
*netns
= dev_net(dev_curr
);
6204 /* Non-redirect use-cases can use ifindex=0 and save ifindex lookup */
6208 return dev_get_by_index_rcu(netns
, ifindex
);
6211 BPF_CALL_5(bpf_skb_check_mtu
, struct sk_buff
*, skb
,
6212 u32
, ifindex
, u32
*, mtu_len
, s32
, len_diff
, u64
, flags
)
6214 int ret
= BPF_MTU_CHK_RET_FRAG_NEEDED
;
6215 struct net_device
*dev
= skb
->dev
;
6216 int skb_len
, dev_len
;
6219 if (unlikely(flags
& ~(BPF_MTU_CHK_SEGS
)))
6222 if (unlikely(flags
& BPF_MTU_CHK_SEGS
&& (len_diff
|| *mtu_len
)))
6225 dev
= __dev_via_ifindex(dev
, ifindex
);
6229 mtu
= READ_ONCE(dev
->mtu
);
6231 dev_len
= mtu
+ dev
->hard_header_len
;
6233 /* If set use *mtu_len as input, L3 as iph->tot_len (like fib_lookup) */
6234 skb_len
= *mtu_len
? *mtu_len
+ dev
->hard_header_len
: skb
->len
;
6236 skb_len
+= len_diff
; /* minus result pass check */
6237 if (skb_len
<= dev_len
) {
6238 ret
= BPF_MTU_CHK_RET_SUCCESS
;
6241 /* At this point, skb->len exceed MTU, but as it include length of all
6242 * segments, it can still be below MTU. The SKB can possibly get
6243 * re-segmented in transmit path (see validate_xmit_skb). Thus, user
6244 * must choose if segs are to be MTU checked.
6246 if (skb_is_gso(skb
)) {
6247 ret
= BPF_MTU_CHK_RET_SUCCESS
;
6249 if (flags
& BPF_MTU_CHK_SEGS
&&
6250 !skb_gso_validate_network_len(skb
, mtu
))
6251 ret
= BPF_MTU_CHK_RET_SEGS_TOOBIG
;
6254 /* BPF verifier guarantees valid pointer */
6260 BPF_CALL_5(bpf_xdp_check_mtu
, struct xdp_buff
*, xdp
,
6261 u32
, ifindex
, u32
*, mtu_len
, s32
, len_diff
, u64
, flags
)
6263 struct net_device
*dev
= xdp
->rxq
->dev
;
6264 int xdp_len
= xdp
->data_end
- xdp
->data
;
6265 int ret
= BPF_MTU_CHK_RET_SUCCESS
;
6268 /* XDP variant doesn't support multi-buffer segment check (yet) */
6269 if (unlikely(flags
))
6272 dev
= __dev_via_ifindex(dev
, ifindex
);
6276 mtu
= READ_ONCE(dev
->mtu
);
6278 /* Add L2-header as dev MTU is L3 size */
6279 dev_len
= mtu
+ dev
->hard_header_len
;
6281 /* Use *mtu_len as input, L3 as iph->tot_len (like fib_lookup) */
6283 xdp_len
= *mtu_len
+ dev
->hard_header_len
;
6285 xdp_len
+= len_diff
; /* minus result pass check */
6286 if (xdp_len
> dev_len
)
6287 ret
= BPF_MTU_CHK_RET_FRAG_NEEDED
;
6289 /* BPF verifier guarantees valid pointer */
6295 static const struct bpf_func_proto bpf_skb_check_mtu_proto
= {
6296 .func
= bpf_skb_check_mtu
,
6298 .ret_type
= RET_INTEGER
,
6299 .arg1_type
= ARG_PTR_TO_CTX
,
6300 .arg2_type
= ARG_ANYTHING
,
6301 .arg3_type
= ARG_PTR_TO_INT
,
6302 .arg4_type
= ARG_ANYTHING
,
6303 .arg5_type
= ARG_ANYTHING
,
6306 static const struct bpf_func_proto bpf_xdp_check_mtu_proto
= {
6307 .func
= bpf_xdp_check_mtu
,
6309 .ret_type
= RET_INTEGER
,
6310 .arg1_type
= ARG_PTR_TO_CTX
,
6311 .arg2_type
= ARG_ANYTHING
,
6312 .arg3_type
= ARG_PTR_TO_INT
,
6313 .arg4_type
= ARG_ANYTHING
,
6314 .arg5_type
= ARG_ANYTHING
,
6317 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
6318 static int bpf_push_seg6_encap(struct sk_buff
*skb
, u32 type
, void *hdr
, u32 len
)
6321 struct ipv6_sr_hdr
*srh
= (struct ipv6_sr_hdr
*)hdr
;
6323 if (!seg6_validate_srh(srh
, len
, false))
6327 case BPF_LWT_ENCAP_SEG6_INLINE
:
6328 if (skb
->protocol
!= htons(ETH_P_IPV6
))
6331 err
= seg6_do_srh_inline(skb
, srh
);
6333 case BPF_LWT_ENCAP_SEG6
:
6334 skb_reset_inner_headers(skb
);
6335 skb
->encapsulation
= 1;
6336 err
= seg6_do_srh_encap(skb
, srh
, IPPROTO_IPV6
);
6342 bpf_compute_data_pointers(skb
);
6346 skb_set_transport_header(skb
, sizeof(struct ipv6hdr
));
6348 return seg6_lookup_nexthop(skb
, NULL
, 0);
6350 #endif /* CONFIG_IPV6_SEG6_BPF */
6352 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
6353 static int bpf_push_ip_encap(struct sk_buff
*skb
, void *hdr
, u32 len
,
6356 return bpf_lwt_push_ip_encap(skb
, hdr
, len
, ingress
);
6360 BPF_CALL_4(bpf_lwt_in_push_encap
, struct sk_buff
*, skb
, u32
, type
, void *, hdr
,
6364 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
6365 case BPF_LWT_ENCAP_SEG6
:
6366 case BPF_LWT_ENCAP_SEG6_INLINE
:
6367 return bpf_push_seg6_encap(skb
, type
, hdr
, len
);
6369 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
6370 case BPF_LWT_ENCAP_IP
:
6371 return bpf_push_ip_encap(skb
, hdr
, len
, true /* ingress */);
6378 BPF_CALL_4(bpf_lwt_xmit_push_encap
, struct sk_buff
*, skb
, u32
, type
,
6379 void *, hdr
, u32
, len
)
6382 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
6383 case BPF_LWT_ENCAP_IP
:
6384 return bpf_push_ip_encap(skb
, hdr
, len
, false /* egress */);
6391 static const struct bpf_func_proto bpf_lwt_in_push_encap_proto
= {
6392 .func
= bpf_lwt_in_push_encap
,
6394 .ret_type
= RET_INTEGER
,
6395 .arg1_type
= ARG_PTR_TO_CTX
,
6396 .arg2_type
= ARG_ANYTHING
,
6397 .arg3_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
6398 .arg4_type
= ARG_CONST_SIZE
6401 static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto
= {
6402 .func
= bpf_lwt_xmit_push_encap
,
6404 .ret_type
= RET_INTEGER
,
6405 .arg1_type
= ARG_PTR_TO_CTX
,
6406 .arg2_type
= ARG_ANYTHING
,
6407 .arg3_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
6408 .arg4_type
= ARG_CONST_SIZE
6411 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
6412 BPF_CALL_4(bpf_lwt_seg6_store_bytes
, struct sk_buff
*, skb
, u32
, offset
,
6413 const void *, from
, u32
, len
)
6415 struct seg6_bpf_srh_state
*srh_state
=
6416 this_cpu_ptr(&seg6_bpf_srh_states
);
6417 struct ipv6_sr_hdr
*srh
= srh_state
->srh
;
6418 void *srh_tlvs
, *srh_end
, *ptr
;
6424 srh_tlvs
= (void *)((char *)srh
+ ((srh
->first_segment
+ 1) << 4));
6425 srh_end
= (void *)((char *)srh
+ sizeof(*srh
) + srh_state
->hdrlen
);
6427 ptr
= skb
->data
+ offset
;
6428 if (ptr
>= srh_tlvs
&& ptr
+ len
<= srh_end
)
6429 srh_state
->valid
= false;
6430 else if (ptr
< (void *)&srh
->flags
||
6431 ptr
+ len
> (void *)&srh
->segments
)
6434 if (unlikely(bpf_try_make_writable(skb
, offset
+ len
)))
6436 if (ipv6_find_hdr(skb
, &srhoff
, IPPROTO_ROUTING
, NULL
, NULL
) < 0)
6438 srh_state
->srh
= (struct ipv6_sr_hdr
*)(skb
->data
+ srhoff
);
6440 memcpy(skb
->data
+ offset
, from
, len
);
6444 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto
= {
6445 .func
= bpf_lwt_seg6_store_bytes
,
6447 .ret_type
= RET_INTEGER
,
6448 .arg1_type
= ARG_PTR_TO_CTX
,
6449 .arg2_type
= ARG_ANYTHING
,
6450 .arg3_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
6451 .arg4_type
= ARG_CONST_SIZE
6454 static void bpf_update_srh_state(struct sk_buff
*skb
)
6456 struct seg6_bpf_srh_state
*srh_state
=
6457 this_cpu_ptr(&seg6_bpf_srh_states
);
6460 if (ipv6_find_hdr(skb
, &srhoff
, IPPROTO_ROUTING
, NULL
, NULL
) < 0) {
6461 srh_state
->srh
= NULL
;
6463 srh_state
->srh
= (struct ipv6_sr_hdr
*)(skb
->data
+ srhoff
);
6464 srh_state
->hdrlen
= srh_state
->srh
->hdrlen
<< 3;
6465 srh_state
->valid
= true;
6469 BPF_CALL_4(bpf_lwt_seg6_action
, struct sk_buff
*, skb
,
6470 u32
, action
, void *, param
, u32
, param_len
)
6472 struct seg6_bpf_srh_state
*srh_state
=
6473 this_cpu_ptr(&seg6_bpf_srh_states
);
6478 case SEG6_LOCAL_ACTION_END_X
:
6479 if (!seg6_bpf_has_valid_srh(skb
))
6481 if (param_len
!= sizeof(struct in6_addr
))
6483 return seg6_lookup_nexthop(skb
, (struct in6_addr
*)param
, 0);
6484 case SEG6_LOCAL_ACTION_END_T
:
6485 if (!seg6_bpf_has_valid_srh(skb
))
6487 if (param_len
!= sizeof(int))
6489 return seg6_lookup_nexthop(skb
, NULL
, *(int *)param
);
6490 case SEG6_LOCAL_ACTION_END_DT6
:
6491 if (!seg6_bpf_has_valid_srh(skb
))
6493 if (param_len
!= sizeof(int))
6496 if (ipv6_find_hdr(skb
, &hdroff
, IPPROTO_IPV6
, NULL
, NULL
) < 0)
6498 if (!pskb_pull(skb
, hdroff
))
6501 skb_postpull_rcsum(skb
, skb_network_header(skb
), hdroff
);
6502 skb_reset_network_header(skb
);
6503 skb_reset_transport_header(skb
);
6504 skb
->encapsulation
= 0;
6506 bpf_compute_data_pointers(skb
);
6507 bpf_update_srh_state(skb
);
6508 return seg6_lookup_nexthop(skb
, NULL
, *(int *)param
);
6509 case SEG6_LOCAL_ACTION_END_B6
:
6510 if (srh_state
->srh
&& !seg6_bpf_has_valid_srh(skb
))
6512 err
= bpf_push_seg6_encap(skb
, BPF_LWT_ENCAP_SEG6_INLINE
,
6515 bpf_update_srh_state(skb
);
6518 case SEG6_LOCAL_ACTION_END_B6_ENCAP
:
6519 if (srh_state
->srh
&& !seg6_bpf_has_valid_srh(skb
))
6521 err
= bpf_push_seg6_encap(skb
, BPF_LWT_ENCAP_SEG6
,
6524 bpf_update_srh_state(skb
);
6532 static const struct bpf_func_proto bpf_lwt_seg6_action_proto
= {
6533 .func
= bpf_lwt_seg6_action
,
6535 .ret_type
= RET_INTEGER
,
6536 .arg1_type
= ARG_PTR_TO_CTX
,
6537 .arg2_type
= ARG_ANYTHING
,
6538 .arg3_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
6539 .arg4_type
= ARG_CONST_SIZE
6542 BPF_CALL_3(bpf_lwt_seg6_adjust_srh
, struct sk_buff
*, skb
, u32
, offset
,
6545 struct seg6_bpf_srh_state
*srh_state
=
6546 this_cpu_ptr(&seg6_bpf_srh_states
);
6547 struct ipv6_sr_hdr
*srh
= srh_state
->srh
;
6548 void *srh_end
, *srh_tlvs
, *ptr
;
6549 struct ipv6hdr
*hdr
;
6553 if (unlikely(srh
== NULL
))
6556 srh_tlvs
= (void *)((unsigned char *)srh
+ sizeof(*srh
) +
6557 ((srh
->first_segment
+ 1) << 4));
6558 srh_end
= (void *)((unsigned char *)srh
+ sizeof(*srh
) +
6560 ptr
= skb
->data
+ offset
;
6562 if (unlikely(ptr
< srh_tlvs
|| ptr
> srh_end
))
6564 if (unlikely(len
< 0 && (void *)((char *)ptr
- len
) > srh_end
))
6568 ret
= skb_cow_head(skb
, len
);
6569 if (unlikely(ret
< 0))
6572 ret
= bpf_skb_net_hdr_push(skb
, offset
, len
);
6574 ret
= bpf_skb_net_hdr_pop(skb
, offset
, -1 * len
);
6577 bpf_compute_data_pointers(skb
);
6578 if (unlikely(ret
< 0))
6581 hdr
= (struct ipv6hdr
*)skb
->data
;
6582 hdr
->payload_len
= htons(skb
->len
- sizeof(struct ipv6hdr
));
6584 if (ipv6_find_hdr(skb
, &srhoff
, IPPROTO_ROUTING
, NULL
, NULL
) < 0)
6586 srh_state
->srh
= (struct ipv6_sr_hdr
*)(skb
->data
+ srhoff
);
6587 srh_state
->hdrlen
+= len
;
6588 srh_state
->valid
= false;
6592 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto
= {
6593 .func
= bpf_lwt_seg6_adjust_srh
,
6595 .ret_type
= RET_INTEGER
,
6596 .arg1_type
= ARG_PTR_TO_CTX
,
6597 .arg2_type
= ARG_ANYTHING
,
6598 .arg3_type
= ARG_ANYTHING
,
6600 #endif /* CONFIG_IPV6_SEG6_BPF */
6603 static struct sock
*sk_lookup(struct net
*net
, struct bpf_sock_tuple
*tuple
,
6604 int dif
, int sdif
, u8 family
, u8 proto
)
6606 struct inet_hashinfo
*hinfo
= net
->ipv4
.tcp_death_row
.hashinfo
;
6607 bool refcounted
= false;
6608 struct sock
*sk
= NULL
;
6610 if (family
== AF_INET
) {
6611 __be32 src4
= tuple
->ipv4
.saddr
;
6612 __be32 dst4
= tuple
->ipv4
.daddr
;
6614 if (proto
== IPPROTO_TCP
)
6615 sk
= __inet_lookup(net
, hinfo
, NULL
, 0,
6616 src4
, tuple
->ipv4
.sport
,
6617 dst4
, tuple
->ipv4
.dport
,
6618 dif
, sdif
, &refcounted
);
6620 sk
= __udp4_lib_lookup(net
, src4
, tuple
->ipv4
.sport
,
6621 dst4
, tuple
->ipv4
.dport
,
6622 dif
, sdif
, net
->ipv4
.udp_table
, NULL
);
6623 #if IS_ENABLED(CONFIG_IPV6)
6625 struct in6_addr
*src6
= (struct in6_addr
*)&tuple
->ipv6
.saddr
;
6626 struct in6_addr
*dst6
= (struct in6_addr
*)&tuple
->ipv6
.daddr
;
6628 if (proto
== IPPROTO_TCP
)
6629 sk
= __inet6_lookup(net
, hinfo
, NULL
, 0,
6630 src6
, tuple
->ipv6
.sport
,
6631 dst6
, ntohs(tuple
->ipv6
.dport
),
6632 dif
, sdif
, &refcounted
);
6633 else if (likely(ipv6_bpf_stub
))
6634 sk
= ipv6_bpf_stub
->udp6_lib_lookup(net
,
6635 src6
, tuple
->ipv6
.sport
,
6636 dst6
, tuple
->ipv6
.dport
,
6638 net
->ipv4
.udp_table
, NULL
);
6642 if (unlikely(sk
&& !refcounted
&& !sock_flag(sk
, SOCK_RCU_FREE
))) {
6643 WARN_ONCE(1, "Found non-RCU, unreferenced socket!");
6649 /* bpf_skc_lookup performs the core lookup for different types of sockets,
6650 * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE.
6652 static struct sock
*
6653 __bpf_skc_lookup(struct sk_buff
*skb
, struct bpf_sock_tuple
*tuple
, u32 len
,
6654 struct net
*caller_net
, u32 ifindex
, u8 proto
, u64 netns_id
,
6655 u64 flags
, int sdif
)
6657 struct sock
*sk
= NULL
;
6661 if (len
== sizeof(tuple
->ipv4
))
6663 else if (len
== sizeof(tuple
->ipv6
))
6668 if (unlikely(flags
|| !((s32
)netns_id
< 0 || netns_id
<= S32_MAX
)))
6672 if (family
== AF_INET
)
6673 sdif
= inet_sdif(skb
);
6675 sdif
= inet6_sdif(skb
);
6678 if ((s32
)netns_id
< 0) {
6680 sk
= sk_lookup(net
, tuple
, ifindex
, sdif
, family
, proto
);
6682 net
= get_net_ns_by_id(caller_net
, netns_id
);
6685 sk
= sk_lookup(net
, tuple
, ifindex
, sdif
, family
, proto
);
6693 static struct sock
*
6694 __bpf_sk_lookup(struct sk_buff
*skb
, struct bpf_sock_tuple
*tuple
, u32 len
,
6695 struct net
*caller_net
, u32 ifindex
, u8 proto
, u64 netns_id
,
6696 u64 flags
, int sdif
)
6698 struct sock
*sk
= __bpf_skc_lookup(skb
, tuple
, len
, caller_net
,
6699 ifindex
, proto
, netns_id
, flags
,
6703 struct sock
*sk2
= sk_to_full_sk(sk
);
6705 /* sk_to_full_sk() may return (sk)->rsk_listener, so make sure the original sk
6706 * sock refcnt is decremented to prevent a request_sock leak.
6708 if (!sk_fullsock(sk2
))
6712 /* Ensure there is no need to bump sk2 refcnt */
6713 if (unlikely(sk2
&& !sock_flag(sk2
, SOCK_RCU_FREE
))) {
6714 WARN_ONCE(1, "Found non-RCU, unreferenced socket!");
6724 static struct sock
*
6725 bpf_skc_lookup(struct sk_buff
*skb
, struct bpf_sock_tuple
*tuple
, u32 len
,
6726 u8 proto
, u64 netns_id
, u64 flags
)
6728 struct net
*caller_net
;
6732 caller_net
= dev_net(skb
->dev
);
6733 ifindex
= skb
->dev
->ifindex
;
6735 caller_net
= sock_net(skb
->sk
);
6739 return __bpf_skc_lookup(skb
, tuple
, len
, caller_net
, ifindex
, proto
,
6740 netns_id
, flags
, -1);
6743 static struct sock
*
6744 bpf_sk_lookup(struct sk_buff
*skb
, struct bpf_sock_tuple
*tuple
, u32 len
,
6745 u8 proto
, u64 netns_id
, u64 flags
)
6747 struct sock
*sk
= bpf_skc_lookup(skb
, tuple
, len
, proto
, netns_id
,
6751 struct sock
*sk2
= sk_to_full_sk(sk
);
6753 /* sk_to_full_sk() may return (sk)->rsk_listener, so make sure the original sk
6754 * sock refcnt is decremented to prevent a request_sock leak.
6756 if (!sk_fullsock(sk2
))
6760 /* Ensure there is no need to bump sk2 refcnt */
6761 if (unlikely(sk2
&& !sock_flag(sk2
, SOCK_RCU_FREE
))) {
6762 WARN_ONCE(1, "Found non-RCU, unreferenced socket!");
6772 BPF_CALL_5(bpf_skc_lookup_tcp
, struct sk_buff
*, skb
,
6773 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
6775 return (unsigned long)bpf_skc_lookup(skb
, tuple
, len
, IPPROTO_TCP
,
6779 static const struct bpf_func_proto bpf_skc_lookup_tcp_proto
= {
6780 .func
= bpf_skc_lookup_tcp
,
6783 .ret_type
= RET_PTR_TO_SOCK_COMMON_OR_NULL
,
6784 .arg1_type
= ARG_PTR_TO_CTX
,
6785 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
6786 .arg3_type
= ARG_CONST_SIZE
,
6787 .arg4_type
= ARG_ANYTHING
,
6788 .arg5_type
= ARG_ANYTHING
,
6791 BPF_CALL_5(bpf_sk_lookup_tcp
, struct sk_buff
*, skb
,
6792 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
6794 return (unsigned long)bpf_sk_lookup(skb
, tuple
, len
, IPPROTO_TCP
,
6798 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto
= {
6799 .func
= bpf_sk_lookup_tcp
,
6802 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
6803 .arg1_type
= ARG_PTR_TO_CTX
,
6804 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
6805 .arg3_type
= ARG_CONST_SIZE
,
6806 .arg4_type
= ARG_ANYTHING
,
6807 .arg5_type
= ARG_ANYTHING
,
6810 BPF_CALL_5(bpf_sk_lookup_udp
, struct sk_buff
*, skb
,
6811 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
6813 return (unsigned long)bpf_sk_lookup(skb
, tuple
, len
, IPPROTO_UDP
,
6817 static const struct bpf_func_proto bpf_sk_lookup_udp_proto
= {
6818 .func
= bpf_sk_lookup_udp
,
6821 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
6822 .arg1_type
= ARG_PTR_TO_CTX
,
6823 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
6824 .arg3_type
= ARG_CONST_SIZE
,
6825 .arg4_type
= ARG_ANYTHING
,
6826 .arg5_type
= ARG_ANYTHING
,
6829 BPF_CALL_5(bpf_tc_skc_lookup_tcp
, struct sk_buff
*, skb
,
6830 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
6832 struct net_device
*dev
= skb
->dev
;
6833 int ifindex
= dev
->ifindex
, sdif
= dev_sdif(dev
);
6834 struct net
*caller_net
= dev_net(dev
);
6836 return (unsigned long)__bpf_skc_lookup(skb
, tuple
, len
, caller_net
,
6837 ifindex
, IPPROTO_TCP
, netns_id
,
6841 static const struct bpf_func_proto bpf_tc_skc_lookup_tcp_proto
= {
6842 .func
= bpf_tc_skc_lookup_tcp
,
6845 .ret_type
= RET_PTR_TO_SOCK_COMMON_OR_NULL
,
6846 .arg1_type
= ARG_PTR_TO_CTX
,
6847 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
6848 .arg3_type
= ARG_CONST_SIZE
,
6849 .arg4_type
= ARG_ANYTHING
,
6850 .arg5_type
= ARG_ANYTHING
,
6853 BPF_CALL_5(bpf_tc_sk_lookup_tcp
, struct sk_buff
*, skb
,
6854 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
6856 struct net_device
*dev
= skb
->dev
;
6857 int ifindex
= dev
->ifindex
, sdif
= dev_sdif(dev
);
6858 struct net
*caller_net
= dev_net(dev
);
6860 return (unsigned long)__bpf_sk_lookup(skb
, tuple
, len
, caller_net
,
6861 ifindex
, IPPROTO_TCP
, netns_id
,
6865 static const struct bpf_func_proto bpf_tc_sk_lookup_tcp_proto
= {
6866 .func
= bpf_tc_sk_lookup_tcp
,
6869 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
6870 .arg1_type
= ARG_PTR_TO_CTX
,
6871 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
6872 .arg3_type
= ARG_CONST_SIZE
,
6873 .arg4_type
= ARG_ANYTHING
,
6874 .arg5_type
= ARG_ANYTHING
,
6877 BPF_CALL_5(bpf_tc_sk_lookup_udp
, struct sk_buff
*, skb
,
6878 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
6880 struct net_device
*dev
= skb
->dev
;
6881 int ifindex
= dev
->ifindex
, sdif
= dev_sdif(dev
);
6882 struct net
*caller_net
= dev_net(dev
);
6884 return (unsigned long)__bpf_sk_lookup(skb
, tuple
, len
, caller_net
,
6885 ifindex
, IPPROTO_UDP
, netns_id
,
6889 static const struct bpf_func_proto bpf_tc_sk_lookup_udp_proto
= {
6890 .func
= bpf_tc_sk_lookup_udp
,
6893 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
6894 .arg1_type
= ARG_PTR_TO_CTX
,
6895 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
6896 .arg3_type
= ARG_CONST_SIZE
,
6897 .arg4_type
= ARG_ANYTHING
,
6898 .arg5_type
= ARG_ANYTHING
,
6901 BPF_CALL_1(bpf_sk_release
, struct sock
*, sk
)
6903 if (sk
&& sk_is_refcounted(sk
))
6908 static const struct bpf_func_proto bpf_sk_release_proto
= {
6909 .func
= bpf_sk_release
,
6911 .ret_type
= RET_INTEGER
,
6912 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
| OBJ_RELEASE
,
6915 BPF_CALL_5(bpf_xdp_sk_lookup_udp
, struct xdp_buff
*, ctx
,
6916 struct bpf_sock_tuple
*, tuple
, u32
, len
, u32
, netns_id
, u64
, flags
)
6918 struct net_device
*dev
= ctx
->rxq
->dev
;
6919 int ifindex
= dev
->ifindex
, sdif
= dev_sdif(dev
);
6920 struct net
*caller_net
= dev_net(dev
);
6922 return (unsigned long)__bpf_sk_lookup(NULL
, tuple
, len
, caller_net
,
6923 ifindex
, IPPROTO_UDP
, netns_id
,
6927 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto
= {
6928 .func
= bpf_xdp_sk_lookup_udp
,
6931 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
6932 .arg1_type
= ARG_PTR_TO_CTX
,
6933 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
6934 .arg3_type
= ARG_CONST_SIZE
,
6935 .arg4_type
= ARG_ANYTHING
,
6936 .arg5_type
= ARG_ANYTHING
,
6939 BPF_CALL_5(bpf_xdp_skc_lookup_tcp
, struct xdp_buff
*, ctx
,
6940 struct bpf_sock_tuple
*, tuple
, u32
, len
, u32
, netns_id
, u64
, flags
)
6942 struct net_device
*dev
= ctx
->rxq
->dev
;
6943 int ifindex
= dev
->ifindex
, sdif
= dev_sdif(dev
);
6944 struct net
*caller_net
= dev_net(dev
);
6946 return (unsigned long)__bpf_skc_lookup(NULL
, tuple
, len
, caller_net
,
6947 ifindex
, IPPROTO_TCP
, netns_id
,
6951 static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto
= {
6952 .func
= bpf_xdp_skc_lookup_tcp
,
6955 .ret_type
= RET_PTR_TO_SOCK_COMMON_OR_NULL
,
6956 .arg1_type
= ARG_PTR_TO_CTX
,
6957 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
6958 .arg3_type
= ARG_CONST_SIZE
,
6959 .arg4_type
= ARG_ANYTHING
,
6960 .arg5_type
= ARG_ANYTHING
,
6963 BPF_CALL_5(bpf_xdp_sk_lookup_tcp
, struct xdp_buff
*, ctx
,
6964 struct bpf_sock_tuple
*, tuple
, u32
, len
, u32
, netns_id
, u64
, flags
)
6966 struct net_device
*dev
= ctx
->rxq
->dev
;
6967 int ifindex
= dev
->ifindex
, sdif
= dev_sdif(dev
);
6968 struct net
*caller_net
= dev_net(dev
);
6970 return (unsigned long)__bpf_sk_lookup(NULL
, tuple
, len
, caller_net
,
6971 ifindex
, IPPROTO_TCP
, netns_id
,
6975 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto
= {
6976 .func
= bpf_xdp_sk_lookup_tcp
,
6979 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
6980 .arg1_type
= ARG_PTR_TO_CTX
,
6981 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
6982 .arg3_type
= ARG_CONST_SIZE
,
6983 .arg4_type
= ARG_ANYTHING
,
6984 .arg5_type
= ARG_ANYTHING
,
6987 BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp
, struct bpf_sock_addr_kern
*, ctx
,
6988 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
6990 return (unsigned long)__bpf_skc_lookup(NULL
, tuple
, len
,
6991 sock_net(ctx
->sk
), 0,
6992 IPPROTO_TCP
, netns_id
, flags
,
6996 static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto
= {
6997 .func
= bpf_sock_addr_skc_lookup_tcp
,
6999 .ret_type
= RET_PTR_TO_SOCK_COMMON_OR_NULL
,
7000 .arg1_type
= ARG_PTR_TO_CTX
,
7001 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
7002 .arg3_type
= ARG_CONST_SIZE
,
7003 .arg4_type
= ARG_ANYTHING
,
7004 .arg5_type
= ARG_ANYTHING
,
7007 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp
, struct bpf_sock_addr_kern
*, ctx
,
7008 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
7010 return (unsigned long)__bpf_sk_lookup(NULL
, tuple
, len
,
7011 sock_net(ctx
->sk
), 0, IPPROTO_TCP
,
7012 netns_id
, flags
, -1);
7015 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto
= {
7016 .func
= bpf_sock_addr_sk_lookup_tcp
,
7018 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
7019 .arg1_type
= ARG_PTR_TO_CTX
,
7020 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
7021 .arg3_type
= ARG_CONST_SIZE
,
7022 .arg4_type
= ARG_ANYTHING
,
7023 .arg5_type
= ARG_ANYTHING
,
7026 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp
, struct bpf_sock_addr_kern
*, ctx
,
7027 struct bpf_sock_tuple
*, tuple
, u32
, len
, u64
, netns_id
, u64
, flags
)
7029 return (unsigned long)__bpf_sk_lookup(NULL
, tuple
, len
,
7030 sock_net(ctx
->sk
), 0, IPPROTO_UDP
,
7031 netns_id
, flags
, -1);
7034 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto
= {
7035 .func
= bpf_sock_addr_sk_lookup_udp
,
7037 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
7038 .arg1_type
= ARG_PTR_TO_CTX
,
7039 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
7040 .arg3_type
= ARG_CONST_SIZE
,
7041 .arg4_type
= ARG_ANYTHING
,
7042 .arg5_type
= ARG_ANYTHING
,
7045 bool bpf_tcp_sock_is_valid_access(int off
, int size
, enum bpf_access_type type
,
7046 struct bpf_insn_access_aux
*info
)
7048 if (off
< 0 || off
>= offsetofend(struct bpf_tcp_sock
,
7052 if (off
% size
!= 0)
7056 case offsetof(struct bpf_tcp_sock
, bytes_received
):
7057 case offsetof(struct bpf_tcp_sock
, bytes_acked
):
7058 return size
== sizeof(__u64
);
7060 return size
== sizeof(__u32
);
7064 u32
bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type
,
7065 const struct bpf_insn
*si
,
7066 struct bpf_insn
*insn_buf
,
7067 struct bpf_prog
*prog
, u32
*target_size
)
7069 struct bpf_insn
*insn
= insn_buf
;
7071 #define BPF_TCP_SOCK_GET_COMMON(FIELD) \
7073 BUILD_BUG_ON(sizeof_field(struct tcp_sock, FIELD) > \
7074 sizeof_field(struct bpf_tcp_sock, FIELD)); \
7075 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\
7076 si->dst_reg, si->src_reg, \
7077 offsetof(struct tcp_sock, FIELD)); \
7080 #define BPF_INET_SOCK_GET_COMMON(FIELD) \
7082 BUILD_BUG_ON(sizeof_field(struct inet_connection_sock, \
7084 sizeof_field(struct bpf_tcp_sock, FIELD)); \
7085 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
7086 struct inet_connection_sock, \
7088 si->dst_reg, si->src_reg, \
7090 struct inet_connection_sock, \
7094 BTF_TYPE_EMIT(struct bpf_tcp_sock
);
7097 case offsetof(struct bpf_tcp_sock
, rtt_min
):
7098 BUILD_BUG_ON(sizeof_field(struct tcp_sock
, rtt_min
) !=
7099 sizeof(struct minmax
));
7100 BUILD_BUG_ON(sizeof(struct minmax
) <
7101 sizeof(struct minmax_sample
));
7103 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
7104 offsetof(struct tcp_sock
, rtt_min
) +
7105 offsetof(struct minmax_sample
, v
));
7107 case offsetof(struct bpf_tcp_sock
, snd_cwnd
):
7108 BPF_TCP_SOCK_GET_COMMON(snd_cwnd
);
7110 case offsetof(struct bpf_tcp_sock
, srtt_us
):
7111 BPF_TCP_SOCK_GET_COMMON(srtt_us
);
7113 case offsetof(struct bpf_tcp_sock
, snd_ssthresh
):
7114 BPF_TCP_SOCK_GET_COMMON(snd_ssthresh
);
7116 case offsetof(struct bpf_tcp_sock
, rcv_nxt
):
7117 BPF_TCP_SOCK_GET_COMMON(rcv_nxt
);
7119 case offsetof(struct bpf_tcp_sock
, snd_nxt
):
7120 BPF_TCP_SOCK_GET_COMMON(snd_nxt
);
7122 case offsetof(struct bpf_tcp_sock
, snd_una
):
7123 BPF_TCP_SOCK_GET_COMMON(snd_una
);
7125 case offsetof(struct bpf_tcp_sock
, mss_cache
):
7126 BPF_TCP_SOCK_GET_COMMON(mss_cache
);
7128 case offsetof(struct bpf_tcp_sock
, ecn_flags
):
7129 BPF_TCP_SOCK_GET_COMMON(ecn_flags
);
7131 case offsetof(struct bpf_tcp_sock
, rate_delivered
):
7132 BPF_TCP_SOCK_GET_COMMON(rate_delivered
);
7134 case offsetof(struct bpf_tcp_sock
, rate_interval_us
):
7135 BPF_TCP_SOCK_GET_COMMON(rate_interval_us
);
7137 case offsetof(struct bpf_tcp_sock
, packets_out
):
7138 BPF_TCP_SOCK_GET_COMMON(packets_out
);
7140 case offsetof(struct bpf_tcp_sock
, retrans_out
):
7141 BPF_TCP_SOCK_GET_COMMON(retrans_out
);
7143 case offsetof(struct bpf_tcp_sock
, total_retrans
):
7144 BPF_TCP_SOCK_GET_COMMON(total_retrans
);
7146 case offsetof(struct bpf_tcp_sock
, segs_in
):
7147 BPF_TCP_SOCK_GET_COMMON(segs_in
);
7149 case offsetof(struct bpf_tcp_sock
, data_segs_in
):
7150 BPF_TCP_SOCK_GET_COMMON(data_segs_in
);
7152 case offsetof(struct bpf_tcp_sock
, segs_out
):
7153 BPF_TCP_SOCK_GET_COMMON(segs_out
);
7155 case offsetof(struct bpf_tcp_sock
, data_segs_out
):
7156 BPF_TCP_SOCK_GET_COMMON(data_segs_out
);
7158 case offsetof(struct bpf_tcp_sock
, lost_out
):
7159 BPF_TCP_SOCK_GET_COMMON(lost_out
);
7161 case offsetof(struct bpf_tcp_sock
, sacked_out
):
7162 BPF_TCP_SOCK_GET_COMMON(sacked_out
);
7164 case offsetof(struct bpf_tcp_sock
, bytes_received
):
7165 BPF_TCP_SOCK_GET_COMMON(bytes_received
);
7167 case offsetof(struct bpf_tcp_sock
, bytes_acked
):
7168 BPF_TCP_SOCK_GET_COMMON(bytes_acked
);
7170 case offsetof(struct bpf_tcp_sock
, dsack_dups
):
7171 BPF_TCP_SOCK_GET_COMMON(dsack_dups
);
7173 case offsetof(struct bpf_tcp_sock
, delivered
):
7174 BPF_TCP_SOCK_GET_COMMON(delivered
);
7176 case offsetof(struct bpf_tcp_sock
, delivered_ce
):
7177 BPF_TCP_SOCK_GET_COMMON(delivered_ce
);
7179 case offsetof(struct bpf_tcp_sock
, icsk_retransmits
):
7180 BPF_INET_SOCK_GET_COMMON(icsk_retransmits
);
7184 return insn
- insn_buf
;
7187 BPF_CALL_1(bpf_tcp_sock
, struct sock
*, sk
)
7189 if (sk_fullsock(sk
) && sk
->sk_protocol
== IPPROTO_TCP
)
7190 return (unsigned long)sk
;
7192 return (unsigned long)NULL
;
7195 const struct bpf_func_proto bpf_tcp_sock_proto
= {
7196 .func
= bpf_tcp_sock
,
7198 .ret_type
= RET_PTR_TO_TCP_SOCK_OR_NULL
,
7199 .arg1_type
= ARG_PTR_TO_SOCK_COMMON
,
7202 BPF_CALL_1(bpf_get_listener_sock
, struct sock
*, sk
)
7204 sk
= sk_to_full_sk(sk
);
7206 if (sk
->sk_state
== TCP_LISTEN
&& sock_flag(sk
, SOCK_RCU_FREE
))
7207 return (unsigned long)sk
;
7209 return (unsigned long)NULL
;
7212 static const struct bpf_func_proto bpf_get_listener_sock_proto
= {
7213 .func
= bpf_get_listener_sock
,
7215 .ret_type
= RET_PTR_TO_SOCKET_OR_NULL
,
7216 .arg1_type
= ARG_PTR_TO_SOCK_COMMON
,
7219 BPF_CALL_1(bpf_skb_ecn_set_ce
, struct sk_buff
*, skb
)
7221 unsigned int iphdr_len
;
7223 switch (skb_protocol(skb
, true)) {
7224 case cpu_to_be16(ETH_P_IP
):
7225 iphdr_len
= sizeof(struct iphdr
);
7227 case cpu_to_be16(ETH_P_IPV6
):
7228 iphdr_len
= sizeof(struct ipv6hdr
);
7234 if (skb_headlen(skb
) < iphdr_len
)
7237 if (skb_cloned(skb
) && !skb_clone_writable(skb
, iphdr_len
))
7240 return INET_ECN_set_ce(skb
);
7243 bool bpf_xdp_sock_is_valid_access(int off
, int size
, enum bpf_access_type type
,
7244 struct bpf_insn_access_aux
*info
)
7246 if (off
< 0 || off
>= offsetofend(struct bpf_xdp_sock
, queue_id
))
7249 if (off
% size
!= 0)
7254 return size
== sizeof(__u32
);
7258 u32
bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type
,
7259 const struct bpf_insn
*si
,
7260 struct bpf_insn
*insn_buf
,
7261 struct bpf_prog
*prog
, u32
*target_size
)
7263 struct bpf_insn
*insn
= insn_buf
;
7265 #define BPF_XDP_SOCK_GET(FIELD) \
7267 BUILD_BUG_ON(sizeof_field(struct xdp_sock, FIELD) > \
7268 sizeof_field(struct bpf_xdp_sock, FIELD)); \
7269 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\
7270 si->dst_reg, si->src_reg, \
7271 offsetof(struct xdp_sock, FIELD)); \
7275 case offsetof(struct bpf_xdp_sock
, queue_id
):
7276 BPF_XDP_SOCK_GET(queue_id
);
7280 return insn
- insn_buf
;
7283 static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto
= {
7284 .func
= bpf_skb_ecn_set_ce
,
7286 .ret_type
= RET_INTEGER
,
7287 .arg1_type
= ARG_PTR_TO_CTX
,
7290 BPF_CALL_5(bpf_tcp_check_syncookie
, struct sock
*, sk
, void *, iph
, u32
, iph_len
,
7291 struct tcphdr
*, th
, u32
, th_len
)
7293 #ifdef CONFIG_SYN_COOKIES
7296 if (unlikely(!sk
|| th_len
< sizeof(*th
)))
7299 /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */
7300 if (sk
->sk_protocol
!= IPPROTO_TCP
|| sk
->sk_state
!= TCP_LISTEN
)
7303 if (!READ_ONCE(sock_net(sk
)->ipv4
.sysctl_tcp_syncookies
))
7306 if (!th
->ack
|| th
->rst
|| th
->syn
)
7309 if (unlikely(iph_len
< sizeof(struct iphdr
)))
7312 if (tcp_synq_no_recent_overflow(sk
))
7315 /* Both struct iphdr and struct ipv6hdr have the version field at the
7316 * same offset so we can cast to the shorter header (struct iphdr).
7318 switch (((struct iphdr
*)iph
)->version
) {
7320 if (sk
->sk_family
== AF_INET6
&& ipv6_only_sock(sk
))
7323 ret
= __cookie_v4_check((struct iphdr
*)iph
, th
);
7326 #if IS_BUILTIN(CONFIG_IPV6)
7328 if (unlikely(iph_len
< sizeof(struct ipv6hdr
)))
7331 if (sk
->sk_family
!= AF_INET6
)
7334 ret
= __cookie_v6_check((struct ipv6hdr
*)iph
, th
);
7336 #endif /* CONFIG_IPV6 */
7339 return -EPROTONOSUPPORT
;
7351 static const struct bpf_func_proto bpf_tcp_check_syncookie_proto
= {
7352 .func
= bpf_tcp_check_syncookie
,
7355 .ret_type
= RET_INTEGER
,
7356 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
7357 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
7358 .arg3_type
= ARG_CONST_SIZE
,
7359 .arg4_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
7360 .arg5_type
= ARG_CONST_SIZE
,
7363 BPF_CALL_5(bpf_tcp_gen_syncookie
, struct sock
*, sk
, void *, iph
, u32
, iph_len
,
7364 struct tcphdr
*, th
, u32
, th_len
)
7366 #ifdef CONFIG_SYN_COOKIES
7370 if (unlikely(!sk
|| th_len
< sizeof(*th
) || th_len
!= th
->doff
* 4))
7373 if (sk
->sk_protocol
!= IPPROTO_TCP
|| sk
->sk_state
!= TCP_LISTEN
)
7376 if (!READ_ONCE(sock_net(sk
)->ipv4
.sysctl_tcp_syncookies
))
7379 if (!th
->syn
|| th
->ack
|| th
->fin
|| th
->rst
)
7382 if (unlikely(iph_len
< sizeof(struct iphdr
)))
7385 /* Both struct iphdr and struct ipv6hdr have the version field at the
7386 * same offset so we can cast to the shorter header (struct iphdr).
7388 switch (((struct iphdr
*)iph
)->version
) {
7390 if (sk
->sk_family
== AF_INET6
&& ipv6_only_sock(sk
))
7393 mss
= tcp_v4_get_syncookie(sk
, iph
, th
, &cookie
);
7396 #if IS_BUILTIN(CONFIG_IPV6)
7398 if (unlikely(iph_len
< sizeof(struct ipv6hdr
)))
7401 if (sk
->sk_family
!= AF_INET6
)
7404 mss
= tcp_v6_get_syncookie(sk
, iph
, th
, &cookie
);
7406 #endif /* CONFIG_IPV6 */
7409 return -EPROTONOSUPPORT
;
7414 return cookie
| ((u64
)mss
<< 32);
7417 #endif /* CONFIG_SYN_COOKIES */
7420 static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto
= {
7421 .func
= bpf_tcp_gen_syncookie
,
7422 .gpl_only
= true, /* __cookie_v*_init_sequence() is GPL */
7424 .ret_type
= RET_INTEGER
,
7425 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
7426 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
7427 .arg3_type
= ARG_CONST_SIZE
,
7428 .arg4_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
7429 .arg5_type
= ARG_CONST_SIZE
,
7432 BPF_CALL_3(bpf_sk_assign
, struct sk_buff
*, skb
, struct sock
*, sk
, u64
, flags
)
7434 if (!sk
|| flags
!= 0)
7436 if (!skb_at_tc_ingress(skb
))
7438 if (unlikely(dev_net(skb
->dev
) != sock_net(sk
)))
7439 return -ENETUNREACH
;
7440 if (sk_unhashed(sk
))
7442 if (sk_is_refcounted(sk
) &&
7443 unlikely(!refcount_inc_not_zero(&sk
->sk_refcnt
)))
7448 skb
->destructor
= sock_pfree
;
7453 static const struct bpf_func_proto bpf_sk_assign_proto
= {
7454 .func
= bpf_sk_assign
,
7456 .ret_type
= RET_INTEGER
,
7457 .arg1_type
= ARG_PTR_TO_CTX
,
7458 .arg2_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
7459 .arg3_type
= ARG_ANYTHING
,
7462 static const u8
*bpf_search_tcp_opt(const u8
*op
, const u8
*opend
,
7463 u8 search_kind
, const u8
*magic
,
7464 u8 magic_len
, bool *eol
)
7470 while (op
< opend
) {
7473 if (kind
== TCPOPT_EOL
) {
7475 return ERR_PTR(-ENOMSG
);
7476 } else if (kind
== TCPOPT_NOP
) {
7481 if (opend
- op
< 2 || opend
- op
< op
[1] || op
[1] < 2)
7482 /* Something is wrong in the received header.
7483 * Follow the TCP stack's tcp_parse_options()
7484 * and just bail here.
7486 return ERR_PTR(-EFAULT
);
7489 if (search_kind
== kind
) {
7493 if (magic_len
> kind_len
- 2)
7494 return ERR_PTR(-ENOMSG
);
7496 if (!memcmp(&op
[2], magic
, magic_len
))
7503 return ERR_PTR(-ENOMSG
);
7506 BPF_CALL_4(bpf_sock_ops_load_hdr_opt
, struct bpf_sock_ops_kern
*, bpf_sock
,
7507 void *, search_res
, u32
, len
, u64
, flags
)
7509 bool eol
, load_syn
= flags
& BPF_LOAD_HDR_OPT_TCP_SYN
;
7510 const u8
*op
, *opend
, *magic
, *search
= search_res
;
7511 u8 search_kind
, search_len
, copy_len
, magic_len
;
7514 /* 2 byte is the minimal option len except TCPOPT_NOP and
7515 * TCPOPT_EOL which are useless for the bpf prog to learn
7516 * and this helper disallow loading them also.
7518 if (len
< 2 || flags
& ~BPF_LOAD_HDR_OPT_TCP_SYN
)
7521 search_kind
= search
[0];
7522 search_len
= search
[1];
7524 if (search_len
> len
|| search_kind
== TCPOPT_NOP
||
7525 search_kind
== TCPOPT_EOL
)
7528 if (search_kind
== TCPOPT_EXP
|| search_kind
== 253) {
7529 /* 16 or 32 bit magic. +2 for kind and kind length */
7530 if (search_len
!= 4 && search_len
!= 6)
7533 magic_len
= search_len
- 2;
7542 ret
= bpf_sock_ops_get_syn(bpf_sock
, TCP_BPF_SYN
, &op
);
7547 op
+= sizeof(struct tcphdr
);
7549 if (!bpf_sock
->skb
||
7550 bpf_sock
->op
== BPF_SOCK_OPS_HDR_OPT_LEN_CB
)
7551 /* This bpf_sock->op cannot call this helper */
7554 opend
= bpf_sock
->skb_data_end
;
7555 op
= bpf_sock
->skb
->data
+ sizeof(struct tcphdr
);
7558 op
= bpf_search_tcp_opt(op
, opend
, search_kind
, magic
, magic_len
,
7565 if (copy_len
> len
) {
7570 memcpy(search_res
, op
, copy_len
);
7574 static const struct bpf_func_proto bpf_sock_ops_load_hdr_opt_proto
= {
7575 .func
= bpf_sock_ops_load_hdr_opt
,
7577 .ret_type
= RET_INTEGER
,
7578 .arg1_type
= ARG_PTR_TO_CTX
,
7579 .arg2_type
= ARG_PTR_TO_MEM
,
7580 .arg3_type
= ARG_CONST_SIZE
,
7581 .arg4_type
= ARG_ANYTHING
,
7584 BPF_CALL_4(bpf_sock_ops_store_hdr_opt
, struct bpf_sock_ops_kern
*, bpf_sock
,
7585 const void *, from
, u32
, len
, u64
, flags
)
7587 u8 new_kind
, new_kind_len
, magic_len
= 0, *opend
;
7588 const u8
*op
, *new_op
, *magic
= NULL
;
7589 struct sk_buff
*skb
;
7592 if (bpf_sock
->op
!= BPF_SOCK_OPS_WRITE_HDR_OPT_CB
)
7595 if (len
< 2 || flags
)
7599 new_kind
= new_op
[0];
7600 new_kind_len
= new_op
[1];
7602 if (new_kind_len
> len
|| new_kind
== TCPOPT_NOP
||
7603 new_kind
== TCPOPT_EOL
)
7606 if (new_kind_len
> bpf_sock
->remaining_opt_len
)
7609 /* 253 is another experimental kind */
7610 if (new_kind
== TCPOPT_EXP
|| new_kind
== 253) {
7611 if (new_kind_len
< 4)
7613 /* Match for the 2 byte magic also.
7614 * RFC 6994: the magic could be 2 or 4 bytes.
7615 * Hence, matching by 2 byte only is on the
7616 * conservative side but it is the right
7617 * thing to do for the 'search-for-duplication'
7624 /* Check for duplication */
7625 skb
= bpf_sock
->skb
;
7626 op
= skb
->data
+ sizeof(struct tcphdr
);
7627 opend
= bpf_sock
->skb_data_end
;
7629 op
= bpf_search_tcp_opt(op
, opend
, new_kind
, magic
, magic_len
,
7634 if (PTR_ERR(op
) != -ENOMSG
)
7638 /* The option has been ended. Treat it as no more
7639 * header option can be written.
7643 /* No duplication found. Store the header option. */
7644 memcpy(opend
, from
, new_kind_len
);
7646 bpf_sock
->remaining_opt_len
-= new_kind_len
;
7647 bpf_sock
->skb_data_end
+= new_kind_len
;
7652 static const struct bpf_func_proto bpf_sock_ops_store_hdr_opt_proto
= {
7653 .func
= bpf_sock_ops_store_hdr_opt
,
7655 .ret_type
= RET_INTEGER
,
7656 .arg1_type
= ARG_PTR_TO_CTX
,
7657 .arg2_type
= ARG_PTR_TO_MEM
| MEM_RDONLY
,
7658 .arg3_type
= ARG_CONST_SIZE
,
7659 .arg4_type
= ARG_ANYTHING
,
7662 BPF_CALL_3(bpf_sock_ops_reserve_hdr_opt
, struct bpf_sock_ops_kern
*, bpf_sock
,
7663 u32
, len
, u64
, flags
)
7665 if (bpf_sock
->op
!= BPF_SOCK_OPS_HDR_OPT_LEN_CB
)
7668 if (flags
|| len
< 2)
7671 if (len
> bpf_sock
->remaining_opt_len
)
7674 bpf_sock
->remaining_opt_len
-= len
;
7679 static const struct bpf_func_proto bpf_sock_ops_reserve_hdr_opt_proto
= {
7680 .func
= bpf_sock_ops_reserve_hdr_opt
,
7682 .ret_type
= RET_INTEGER
,
7683 .arg1_type
= ARG_PTR_TO_CTX
,
7684 .arg2_type
= ARG_ANYTHING
,
7685 .arg3_type
= ARG_ANYTHING
,
7688 BPF_CALL_3(bpf_skb_set_tstamp
, struct sk_buff
*, skb
,
7689 u64
, tstamp
, u32
, tstamp_type
)
7691 /* skb_clear_delivery_time() is done for inet protocol */
7692 if (skb
->protocol
!= htons(ETH_P_IP
) &&
7693 skb
->protocol
!= htons(ETH_P_IPV6
))
7696 switch (tstamp_type
) {
7697 case BPF_SKB_TSTAMP_DELIVERY_MONO
:
7700 skb
->tstamp
= tstamp
;
7701 skb
->mono_delivery_time
= 1;
7703 case BPF_SKB_TSTAMP_UNSPEC
:
7707 skb
->mono_delivery_time
= 0;
7716 static const struct bpf_func_proto bpf_skb_set_tstamp_proto
= {
7717 .func
= bpf_skb_set_tstamp
,
7719 .ret_type
= RET_INTEGER
,
7720 .arg1_type
= ARG_PTR_TO_CTX
,
7721 .arg2_type
= ARG_ANYTHING
,
7722 .arg3_type
= ARG_ANYTHING
,
7725 #ifdef CONFIG_SYN_COOKIES
7726 BPF_CALL_3(bpf_tcp_raw_gen_syncookie_ipv4
, struct iphdr
*, iph
,
7727 struct tcphdr
*, th
, u32
, th_len
)
7732 if (unlikely(th_len
< sizeof(*th
) || th_len
!= th
->doff
* 4))
7735 mss
= tcp_parse_mss_option(th
, 0) ?: TCP_MSS_DEFAULT
;
7736 cookie
= __cookie_v4_init_sequence(iph
, th
, &mss
);
7738 return cookie
| ((u64
)mss
<< 32);
7741 static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv4_proto
= {
7742 .func
= bpf_tcp_raw_gen_syncookie_ipv4
,
7743 .gpl_only
= true, /* __cookie_v4_init_sequence() is GPL */
7745 .ret_type
= RET_INTEGER
,
7746 .arg1_type
= ARG_PTR_TO_FIXED_SIZE_MEM
,
7747 .arg1_size
= sizeof(struct iphdr
),
7748 .arg2_type
= ARG_PTR_TO_MEM
,
7749 .arg3_type
= ARG_CONST_SIZE_OR_ZERO
,
7752 BPF_CALL_3(bpf_tcp_raw_gen_syncookie_ipv6
, struct ipv6hdr
*, iph
,
7753 struct tcphdr
*, th
, u32
, th_len
)
7755 #if IS_BUILTIN(CONFIG_IPV6)
7756 const u16 mss_clamp
= IPV6_MIN_MTU
- sizeof(struct tcphdr
) -
7757 sizeof(struct ipv6hdr
);
7761 if (unlikely(th_len
< sizeof(*th
) || th_len
!= th
->doff
* 4))
7764 mss
= tcp_parse_mss_option(th
, 0) ?: mss_clamp
;
7765 cookie
= __cookie_v6_init_sequence(iph
, th
, &mss
);
7767 return cookie
| ((u64
)mss
<< 32);
7769 return -EPROTONOSUPPORT
;
7773 static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv6_proto
= {
7774 .func
= bpf_tcp_raw_gen_syncookie_ipv6
,
7775 .gpl_only
= true, /* __cookie_v6_init_sequence() is GPL */
7777 .ret_type
= RET_INTEGER
,
7778 .arg1_type
= ARG_PTR_TO_FIXED_SIZE_MEM
,
7779 .arg1_size
= sizeof(struct ipv6hdr
),
7780 .arg2_type
= ARG_PTR_TO_MEM
,
7781 .arg3_type
= ARG_CONST_SIZE_OR_ZERO
,
7784 BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv4
, struct iphdr
*, iph
,
7785 struct tcphdr
*, th
)
7787 if (__cookie_v4_check(iph
, th
) > 0)
7793 static const struct bpf_func_proto bpf_tcp_raw_check_syncookie_ipv4_proto
= {
7794 .func
= bpf_tcp_raw_check_syncookie_ipv4
,
7795 .gpl_only
= true, /* __cookie_v4_check is GPL */
7797 .ret_type
= RET_INTEGER
,
7798 .arg1_type
= ARG_PTR_TO_FIXED_SIZE_MEM
,
7799 .arg1_size
= sizeof(struct iphdr
),
7800 .arg2_type
= ARG_PTR_TO_FIXED_SIZE_MEM
,
7801 .arg2_size
= sizeof(struct tcphdr
),
7804 BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv6
, struct ipv6hdr
*, iph
,
7805 struct tcphdr
*, th
)
7807 #if IS_BUILTIN(CONFIG_IPV6)
7808 if (__cookie_v6_check(iph
, th
) > 0)
7813 return -EPROTONOSUPPORT
;
7817 static const struct bpf_func_proto bpf_tcp_raw_check_syncookie_ipv6_proto
= {
7818 .func
= bpf_tcp_raw_check_syncookie_ipv6
,
7819 .gpl_only
= true, /* __cookie_v6_check is GPL */
7821 .ret_type
= RET_INTEGER
,
7822 .arg1_type
= ARG_PTR_TO_FIXED_SIZE_MEM
,
7823 .arg1_size
= sizeof(struct ipv6hdr
),
7824 .arg2_type
= ARG_PTR_TO_FIXED_SIZE_MEM
,
7825 .arg2_size
= sizeof(struct tcphdr
),
7827 #endif /* CONFIG_SYN_COOKIES */
7829 #endif /* CONFIG_INET */
7831 bool bpf_helper_changes_pkt_data(void *func
)
7833 if (func
== bpf_skb_vlan_push
||
7834 func
== bpf_skb_vlan_pop
||
7835 func
== bpf_skb_store_bytes
||
7836 func
== bpf_skb_change_proto
||
7837 func
== bpf_skb_change_head
||
7838 func
== sk_skb_change_head
||
7839 func
== bpf_skb_change_tail
||
7840 func
== sk_skb_change_tail
||
7841 func
== bpf_skb_adjust_room
||
7842 func
== sk_skb_adjust_room
||
7843 func
== bpf_skb_pull_data
||
7844 func
== sk_skb_pull_data
||
7845 func
== bpf_clone_redirect
||
7846 func
== bpf_l3_csum_replace
||
7847 func
== bpf_l4_csum_replace
||
7848 func
== bpf_xdp_adjust_head
||
7849 func
== bpf_xdp_adjust_meta
||
7850 func
== bpf_msg_pull_data
||
7851 func
== bpf_msg_push_data
||
7852 func
== bpf_msg_pop_data
||
7853 func
== bpf_xdp_adjust_tail
||
7854 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
7855 func
== bpf_lwt_seg6_store_bytes
||
7856 func
== bpf_lwt_seg6_adjust_srh
||
7857 func
== bpf_lwt_seg6_action
||
7860 func
== bpf_sock_ops_store_hdr_opt
||
7862 func
== bpf_lwt_in_push_encap
||
7863 func
== bpf_lwt_xmit_push_encap
)
7869 const struct bpf_func_proto bpf_event_output_data_proto __weak
;
7870 const struct bpf_func_proto bpf_sk_storage_get_cg_sock_proto __weak
;
7872 static const struct bpf_func_proto
*
7873 sock_filter_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
7875 const struct bpf_func_proto
*func_proto
;
7877 func_proto
= cgroup_common_func_proto(func_id
, prog
);
7881 func_proto
= cgroup_current_func_proto(func_id
, prog
);
7886 case BPF_FUNC_get_socket_cookie
:
7887 return &bpf_get_socket_cookie_sock_proto
;
7888 case BPF_FUNC_get_netns_cookie
:
7889 return &bpf_get_netns_cookie_sock_proto
;
7890 case BPF_FUNC_perf_event_output
:
7891 return &bpf_event_output_data_proto
;
7892 case BPF_FUNC_sk_storage_get
:
7893 return &bpf_sk_storage_get_cg_sock_proto
;
7894 case BPF_FUNC_ktime_get_coarse_ns
:
7895 return &bpf_ktime_get_coarse_ns_proto
;
7897 return bpf_base_func_proto(func_id
, prog
);
7901 static const struct bpf_func_proto
*
7902 sock_addr_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
7904 const struct bpf_func_proto
*func_proto
;
7906 func_proto
= cgroup_common_func_proto(func_id
, prog
);
7910 func_proto
= cgroup_current_func_proto(func_id
, prog
);
7916 switch (prog
->expected_attach_type
) {
7917 case BPF_CGROUP_INET4_CONNECT
:
7918 case BPF_CGROUP_INET6_CONNECT
:
7919 return &bpf_bind_proto
;
7923 case BPF_FUNC_get_socket_cookie
:
7924 return &bpf_get_socket_cookie_sock_addr_proto
;
7925 case BPF_FUNC_get_netns_cookie
:
7926 return &bpf_get_netns_cookie_sock_addr_proto
;
7927 case BPF_FUNC_perf_event_output
:
7928 return &bpf_event_output_data_proto
;
7930 case BPF_FUNC_sk_lookup_tcp
:
7931 return &bpf_sock_addr_sk_lookup_tcp_proto
;
7932 case BPF_FUNC_sk_lookup_udp
:
7933 return &bpf_sock_addr_sk_lookup_udp_proto
;
7934 case BPF_FUNC_sk_release
:
7935 return &bpf_sk_release_proto
;
7936 case BPF_FUNC_skc_lookup_tcp
:
7937 return &bpf_sock_addr_skc_lookup_tcp_proto
;
7938 #endif /* CONFIG_INET */
7939 case BPF_FUNC_sk_storage_get
:
7940 return &bpf_sk_storage_get_proto
;
7941 case BPF_FUNC_sk_storage_delete
:
7942 return &bpf_sk_storage_delete_proto
;
7943 case BPF_FUNC_setsockopt
:
7944 switch (prog
->expected_attach_type
) {
7945 case BPF_CGROUP_INET4_BIND
:
7946 case BPF_CGROUP_INET6_BIND
:
7947 case BPF_CGROUP_INET4_CONNECT
:
7948 case BPF_CGROUP_INET6_CONNECT
:
7949 case BPF_CGROUP_UNIX_CONNECT
:
7950 case BPF_CGROUP_UDP4_RECVMSG
:
7951 case BPF_CGROUP_UDP6_RECVMSG
:
7952 case BPF_CGROUP_UNIX_RECVMSG
:
7953 case BPF_CGROUP_UDP4_SENDMSG
:
7954 case BPF_CGROUP_UDP6_SENDMSG
:
7955 case BPF_CGROUP_UNIX_SENDMSG
:
7956 case BPF_CGROUP_INET4_GETPEERNAME
:
7957 case BPF_CGROUP_INET6_GETPEERNAME
:
7958 case BPF_CGROUP_UNIX_GETPEERNAME
:
7959 case BPF_CGROUP_INET4_GETSOCKNAME
:
7960 case BPF_CGROUP_INET6_GETSOCKNAME
:
7961 case BPF_CGROUP_UNIX_GETSOCKNAME
:
7962 return &bpf_sock_addr_setsockopt_proto
;
7966 case BPF_FUNC_getsockopt
:
7967 switch (prog
->expected_attach_type
) {
7968 case BPF_CGROUP_INET4_BIND
:
7969 case BPF_CGROUP_INET6_BIND
:
7970 case BPF_CGROUP_INET4_CONNECT
:
7971 case BPF_CGROUP_INET6_CONNECT
:
7972 case BPF_CGROUP_UNIX_CONNECT
:
7973 case BPF_CGROUP_UDP4_RECVMSG
:
7974 case BPF_CGROUP_UDP6_RECVMSG
:
7975 case BPF_CGROUP_UNIX_RECVMSG
:
7976 case BPF_CGROUP_UDP4_SENDMSG
:
7977 case BPF_CGROUP_UDP6_SENDMSG
:
7978 case BPF_CGROUP_UNIX_SENDMSG
:
7979 case BPF_CGROUP_INET4_GETPEERNAME
:
7980 case BPF_CGROUP_INET6_GETPEERNAME
:
7981 case BPF_CGROUP_UNIX_GETPEERNAME
:
7982 case BPF_CGROUP_INET4_GETSOCKNAME
:
7983 case BPF_CGROUP_INET6_GETSOCKNAME
:
7984 case BPF_CGROUP_UNIX_GETSOCKNAME
:
7985 return &bpf_sock_addr_getsockopt_proto
;
7990 return bpf_sk_base_func_proto(func_id
, prog
);
7994 static const struct bpf_func_proto
*
7995 sk_filter_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
7998 case BPF_FUNC_skb_load_bytes
:
7999 return &bpf_skb_load_bytes_proto
;
8000 case BPF_FUNC_skb_load_bytes_relative
:
8001 return &bpf_skb_load_bytes_relative_proto
;
8002 case BPF_FUNC_get_socket_cookie
:
8003 return &bpf_get_socket_cookie_proto
;
8004 case BPF_FUNC_get_socket_uid
:
8005 return &bpf_get_socket_uid_proto
;
8006 case BPF_FUNC_perf_event_output
:
8007 return &bpf_skb_event_output_proto
;
8009 return bpf_sk_base_func_proto(func_id
, prog
);
8013 const struct bpf_func_proto bpf_sk_storage_get_proto __weak
;
8014 const struct bpf_func_proto bpf_sk_storage_delete_proto __weak
;
8016 static const struct bpf_func_proto
*
8017 cg_skb_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
8019 const struct bpf_func_proto
*func_proto
;
8021 func_proto
= cgroup_common_func_proto(func_id
, prog
);
8026 case BPF_FUNC_sk_fullsock
:
8027 return &bpf_sk_fullsock_proto
;
8028 case BPF_FUNC_sk_storage_get
:
8029 return &bpf_sk_storage_get_proto
;
8030 case BPF_FUNC_sk_storage_delete
:
8031 return &bpf_sk_storage_delete_proto
;
8032 case BPF_FUNC_perf_event_output
:
8033 return &bpf_skb_event_output_proto
;
8034 #ifdef CONFIG_SOCK_CGROUP_DATA
8035 case BPF_FUNC_skb_cgroup_id
:
8036 return &bpf_skb_cgroup_id_proto
;
8037 case BPF_FUNC_skb_ancestor_cgroup_id
:
8038 return &bpf_skb_ancestor_cgroup_id_proto
;
8039 case BPF_FUNC_sk_cgroup_id
:
8040 return &bpf_sk_cgroup_id_proto
;
8041 case BPF_FUNC_sk_ancestor_cgroup_id
:
8042 return &bpf_sk_ancestor_cgroup_id_proto
;
8045 case BPF_FUNC_sk_lookup_tcp
:
8046 return &bpf_sk_lookup_tcp_proto
;
8047 case BPF_FUNC_sk_lookup_udp
:
8048 return &bpf_sk_lookup_udp_proto
;
8049 case BPF_FUNC_sk_release
:
8050 return &bpf_sk_release_proto
;
8051 case BPF_FUNC_skc_lookup_tcp
:
8052 return &bpf_skc_lookup_tcp_proto
;
8053 case BPF_FUNC_tcp_sock
:
8054 return &bpf_tcp_sock_proto
;
8055 case BPF_FUNC_get_listener_sock
:
8056 return &bpf_get_listener_sock_proto
;
8057 case BPF_FUNC_skb_ecn_set_ce
:
8058 return &bpf_skb_ecn_set_ce_proto
;
8061 return sk_filter_func_proto(func_id
, prog
);
8065 static const struct bpf_func_proto
*
8066 tc_cls_act_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
8069 case BPF_FUNC_skb_store_bytes
:
8070 return &bpf_skb_store_bytes_proto
;
8071 case BPF_FUNC_skb_load_bytes
:
8072 return &bpf_skb_load_bytes_proto
;
8073 case BPF_FUNC_skb_load_bytes_relative
:
8074 return &bpf_skb_load_bytes_relative_proto
;
8075 case BPF_FUNC_skb_pull_data
:
8076 return &bpf_skb_pull_data_proto
;
8077 case BPF_FUNC_csum_diff
:
8078 return &bpf_csum_diff_proto
;
8079 case BPF_FUNC_csum_update
:
8080 return &bpf_csum_update_proto
;
8081 case BPF_FUNC_csum_level
:
8082 return &bpf_csum_level_proto
;
8083 case BPF_FUNC_l3_csum_replace
:
8084 return &bpf_l3_csum_replace_proto
;
8085 case BPF_FUNC_l4_csum_replace
:
8086 return &bpf_l4_csum_replace_proto
;
8087 case BPF_FUNC_clone_redirect
:
8088 return &bpf_clone_redirect_proto
;
8089 case BPF_FUNC_get_cgroup_classid
:
8090 return &bpf_get_cgroup_classid_proto
;
8091 case BPF_FUNC_skb_vlan_push
:
8092 return &bpf_skb_vlan_push_proto
;
8093 case BPF_FUNC_skb_vlan_pop
:
8094 return &bpf_skb_vlan_pop_proto
;
8095 case BPF_FUNC_skb_change_proto
:
8096 return &bpf_skb_change_proto_proto
;
8097 case BPF_FUNC_skb_change_type
:
8098 return &bpf_skb_change_type_proto
;
8099 case BPF_FUNC_skb_adjust_room
:
8100 return &bpf_skb_adjust_room_proto
;
8101 case BPF_FUNC_skb_change_tail
:
8102 return &bpf_skb_change_tail_proto
;
8103 case BPF_FUNC_skb_change_head
:
8104 return &bpf_skb_change_head_proto
;
8105 case BPF_FUNC_skb_get_tunnel_key
:
8106 return &bpf_skb_get_tunnel_key_proto
;
8107 case BPF_FUNC_skb_set_tunnel_key
:
8108 return bpf_get_skb_set_tunnel_proto(func_id
);
8109 case BPF_FUNC_skb_get_tunnel_opt
:
8110 return &bpf_skb_get_tunnel_opt_proto
;
8111 case BPF_FUNC_skb_set_tunnel_opt
:
8112 return bpf_get_skb_set_tunnel_proto(func_id
);
8113 case BPF_FUNC_redirect
:
8114 return &bpf_redirect_proto
;
8115 case BPF_FUNC_redirect_neigh
:
8116 return &bpf_redirect_neigh_proto
;
8117 case BPF_FUNC_redirect_peer
:
8118 return &bpf_redirect_peer_proto
;
8119 case BPF_FUNC_get_route_realm
:
8120 return &bpf_get_route_realm_proto
;
8121 case BPF_FUNC_get_hash_recalc
:
8122 return &bpf_get_hash_recalc_proto
;
8123 case BPF_FUNC_set_hash_invalid
:
8124 return &bpf_set_hash_invalid_proto
;
8125 case BPF_FUNC_set_hash
:
8126 return &bpf_set_hash_proto
;
8127 case BPF_FUNC_perf_event_output
:
8128 return &bpf_skb_event_output_proto
;
8129 case BPF_FUNC_get_smp_processor_id
:
8130 return &bpf_get_smp_processor_id_proto
;
8131 case BPF_FUNC_skb_under_cgroup
:
8132 return &bpf_skb_under_cgroup_proto
;
8133 case BPF_FUNC_get_socket_cookie
:
8134 return &bpf_get_socket_cookie_proto
;
8135 case BPF_FUNC_get_socket_uid
:
8136 return &bpf_get_socket_uid_proto
;
8137 case BPF_FUNC_fib_lookup
:
8138 return &bpf_skb_fib_lookup_proto
;
8139 case BPF_FUNC_check_mtu
:
8140 return &bpf_skb_check_mtu_proto
;
8141 case BPF_FUNC_sk_fullsock
:
8142 return &bpf_sk_fullsock_proto
;
8143 case BPF_FUNC_sk_storage_get
:
8144 return &bpf_sk_storage_get_proto
;
8145 case BPF_FUNC_sk_storage_delete
:
8146 return &bpf_sk_storage_delete_proto
;
8148 case BPF_FUNC_skb_get_xfrm_state
:
8149 return &bpf_skb_get_xfrm_state_proto
;
8151 #ifdef CONFIG_CGROUP_NET_CLASSID
8152 case BPF_FUNC_skb_cgroup_classid
:
8153 return &bpf_skb_cgroup_classid_proto
;
8155 #ifdef CONFIG_SOCK_CGROUP_DATA
8156 case BPF_FUNC_skb_cgroup_id
:
8157 return &bpf_skb_cgroup_id_proto
;
8158 case BPF_FUNC_skb_ancestor_cgroup_id
:
8159 return &bpf_skb_ancestor_cgroup_id_proto
;
8162 case BPF_FUNC_sk_lookup_tcp
:
8163 return &bpf_tc_sk_lookup_tcp_proto
;
8164 case BPF_FUNC_sk_lookup_udp
:
8165 return &bpf_tc_sk_lookup_udp_proto
;
8166 case BPF_FUNC_sk_release
:
8167 return &bpf_sk_release_proto
;
8168 case BPF_FUNC_tcp_sock
:
8169 return &bpf_tcp_sock_proto
;
8170 case BPF_FUNC_get_listener_sock
:
8171 return &bpf_get_listener_sock_proto
;
8172 case BPF_FUNC_skc_lookup_tcp
:
8173 return &bpf_tc_skc_lookup_tcp_proto
;
8174 case BPF_FUNC_tcp_check_syncookie
:
8175 return &bpf_tcp_check_syncookie_proto
;
8176 case BPF_FUNC_skb_ecn_set_ce
:
8177 return &bpf_skb_ecn_set_ce_proto
;
8178 case BPF_FUNC_tcp_gen_syncookie
:
8179 return &bpf_tcp_gen_syncookie_proto
;
8180 case BPF_FUNC_sk_assign
:
8181 return &bpf_sk_assign_proto
;
8182 case BPF_FUNC_skb_set_tstamp
:
8183 return &bpf_skb_set_tstamp_proto
;
8184 #ifdef CONFIG_SYN_COOKIES
8185 case BPF_FUNC_tcp_raw_gen_syncookie_ipv4
:
8186 return &bpf_tcp_raw_gen_syncookie_ipv4_proto
;
8187 case BPF_FUNC_tcp_raw_gen_syncookie_ipv6
:
8188 return &bpf_tcp_raw_gen_syncookie_ipv6_proto
;
8189 case BPF_FUNC_tcp_raw_check_syncookie_ipv4
:
8190 return &bpf_tcp_raw_check_syncookie_ipv4_proto
;
8191 case BPF_FUNC_tcp_raw_check_syncookie_ipv6
:
8192 return &bpf_tcp_raw_check_syncookie_ipv6_proto
;
8196 return bpf_sk_base_func_proto(func_id
, prog
);
8200 static const struct bpf_func_proto
*
8201 xdp_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
8204 case BPF_FUNC_perf_event_output
:
8205 return &bpf_xdp_event_output_proto
;
8206 case BPF_FUNC_get_smp_processor_id
:
8207 return &bpf_get_smp_processor_id_proto
;
8208 case BPF_FUNC_csum_diff
:
8209 return &bpf_csum_diff_proto
;
8210 case BPF_FUNC_xdp_adjust_head
:
8211 return &bpf_xdp_adjust_head_proto
;
8212 case BPF_FUNC_xdp_adjust_meta
:
8213 return &bpf_xdp_adjust_meta_proto
;
8214 case BPF_FUNC_redirect
:
8215 return &bpf_xdp_redirect_proto
;
8216 case BPF_FUNC_redirect_map
:
8217 return &bpf_xdp_redirect_map_proto
;
8218 case BPF_FUNC_xdp_adjust_tail
:
8219 return &bpf_xdp_adjust_tail_proto
;
8220 case BPF_FUNC_xdp_get_buff_len
:
8221 return &bpf_xdp_get_buff_len_proto
;
8222 case BPF_FUNC_xdp_load_bytes
:
8223 return &bpf_xdp_load_bytes_proto
;
8224 case BPF_FUNC_xdp_store_bytes
:
8225 return &bpf_xdp_store_bytes_proto
;
8226 case BPF_FUNC_fib_lookup
:
8227 return &bpf_xdp_fib_lookup_proto
;
8228 case BPF_FUNC_check_mtu
:
8229 return &bpf_xdp_check_mtu_proto
;
8231 case BPF_FUNC_sk_lookup_udp
:
8232 return &bpf_xdp_sk_lookup_udp_proto
;
8233 case BPF_FUNC_sk_lookup_tcp
:
8234 return &bpf_xdp_sk_lookup_tcp_proto
;
8235 case BPF_FUNC_sk_release
:
8236 return &bpf_sk_release_proto
;
8237 case BPF_FUNC_skc_lookup_tcp
:
8238 return &bpf_xdp_skc_lookup_tcp_proto
;
8239 case BPF_FUNC_tcp_check_syncookie
:
8240 return &bpf_tcp_check_syncookie_proto
;
8241 case BPF_FUNC_tcp_gen_syncookie
:
8242 return &bpf_tcp_gen_syncookie_proto
;
8243 #ifdef CONFIG_SYN_COOKIES
8244 case BPF_FUNC_tcp_raw_gen_syncookie_ipv4
:
8245 return &bpf_tcp_raw_gen_syncookie_ipv4_proto
;
8246 case BPF_FUNC_tcp_raw_gen_syncookie_ipv6
:
8247 return &bpf_tcp_raw_gen_syncookie_ipv6_proto
;
8248 case BPF_FUNC_tcp_raw_check_syncookie_ipv4
:
8249 return &bpf_tcp_raw_check_syncookie_ipv4_proto
;
8250 case BPF_FUNC_tcp_raw_check_syncookie_ipv6
:
8251 return &bpf_tcp_raw_check_syncookie_ipv6_proto
;
8255 return bpf_sk_base_func_proto(func_id
, prog
);
8258 #if IS_MODULE(CONFIG_NF_CONNTRACK) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES)
8259 /* The nf_conn___init type is used in the NF_CONNTRACK kfuncs. The
8260 * kfuncs are defined in two different modules, and we want to be able
8261 * to use them interchangeably with the same BTF type ID. Because modules
8262 * can't de-duplicate BTF IDs between each other, we need the type to be
8263 * referenced in the vmlinux BTF or the verifier will get confused about
8264 * the different types. So we add this dummy type reference which will
8265 * be included in vmlinux BTF, allowing both modules to refer to the
8268 BTF_TYPE_EMIT(struct nf_conn___init
);
8272 const struct bpf_func_proto bpf_sock_map_update_proto __weak
;
8273 const struct bpf_func_proto bpf_sock_hash_update_proto __weak
;
8275 static const struct bpf_func_proto
*
8276 sock_ops_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
8278 const struct bpf_func_proto
*func_proto
;
8280 func_proto
= cgroup_common_func_proto(func_id
, prog
);
8285 case BPF_FUNC_setsockopt
:
8286 return &bpf_sock_ops_setsockopt_proto
;
8287 case BPF_FUNC_getsockopt
:
8288 return &bpf_sock_ops_getsockopt_proto
;
8289 case BPF_FUNC_sock_ops_cb_flags_set
:
8290 return &bpf_sock_ops_cb_flags_set_proto
;
8291 case BPF_FUNC_sock_map_update
:
8292 return &bpf_sock_map_update_proto
;
8293 case BPF_FUNC_sock_hash_update
:
8294 return &bpf_sock_hash_update_proto
;
8295 case BPF_FUNC_get_socket_cookie
:
8296 return &bpf_get_socket_cookie_sock_ops_proto
;
8297 case BPF_FUNC_perf_event_output
:
8298 return &bpf_event_output_data_proto
;
8299 case BPF_FUNC_sk_storage_get
:
8300 return &bpf_sk_storage_get_proto
;
8301 case BPF_FUNC_sk_storage_delete
:
8302 return &bpf_sk_storage_delete_proto
;
8303 case BPF_FUNC_get_netns_cookie
:
8304 return &bpf_get_netns_cookie_sock_ops_proto
;
8306 case BPF_FUNC_load_hdr_opt
:
8307 return &bpf_sock_ops_load_hdr_opt_proto
;
8308 case BPF_FUNC_store_hdr_opt
:
8309 return &bpf_sock_ops_store_hdr_opt_proto
;
8310 case BPF_FUNC_reserve_hdr_opt
:
8311 return &bpf_sock_ops_reserve_hdr_opt_proto
;
8312 case BPF_FUNC_tcp_sock
:
8313 return &bpf_tcp_sock_proto
;
8314 #endif /* CONFIG_INET */
8316 return bpf_sk_base_func_proto(func_id
, prog
);
8320 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak
;
8321 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak
;
8323 static const struct bpf_func_proto
*
8324 sk_msg_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
8327 case BPF_FUNC_msg_redirect_map
:
8328 return &bpf_msg_redirect_map_proto
;
8329 case BPF_FUNC_msg_redirect_hash
:
8330 return &bpf_msg_redirect_hash_proto
;
8331 case BPF_FUNC_msg_apply_bytes
:
8332 return &bpf_msg_apply_bytes_proto
;
8333 case BPF_FUNC_msg_cork_bytes
:
8334 return &bpf_msg_cork_bytes_proto
;
8335 case BPF_FUNC_msg_pull_data
:
8336 return &bpf_msg_pull_data_proto
;
8337 case BPF_FUNC_msg_push_data
:
8338 return &bpf_msg_push_data_proto
;
8339 case BPF_FUNC_msg_pop_data
:
8340 return &bpf_msg_pop_data_proto
;
8341 case BPF_FUNC_perf_event_output
:
8342 return &bpf_event_output_data_proto
;
8343 case BPF_FUNC_get_current_uid_gid
:
8344 return &bpf_get_current_uid_gid_proto
;
8345 case BPF_FUNC_get_current_pid_tgid
:
8346 return &bpf_get_current_pid_tgid_proto
;
8347 case BPF_FUNC_sk_storage_get
:
8348 return &bpf_sk_storage_get_proto
;
8349 case BPF_FUNC_sk_storage_delete
:
8350 return &bpf_sk_storage_delete_proto
;
8351 case BPF_FUNC_get_netns_cookie
:
8352 return &bpf_get_netns_cookie_sk_msg_proto
;
8353 #ifdef CONFIG_CGROUP_NET_CLASSID
8354 case BPF_FUNC_get_cgroup_classid
:
8355 return &bpf_get_cgroup_classid_curr_proto
;
8358 return bpf_sk_base_func_proto(func_id
, prog
);
8362 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak
;
8363 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak
;
8365 static const struct bpf_func_proto
*
8366 sk_skb_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
8369 case BPF_FUNC_skb_store_bytes
:
8370 return &bpf_skb_store_bytes_proto
;
8371 case BPF_FUNC_skb_load_bytes
:
8372 return &bpf_skb_load_bytes_proto
;
8373 case BPF_FUNC_skb_pull_data
:
8374 return &sk_skb_pull_data_proto
;
8375 case BPF_FUNC_skb_change_tail
:
8376 return &sk_skb_change_tail_proto
;
8377 case BPF_FUNC_skb_change_head
:
8378 return &sk_skb_change_head_proto
;
8379 case BPF_FUNC_skb_adjust_room
:
8380 return &sk_skb_adjust_room_proto
;
8381 case BPF_FUNC_get_socket_cookie
:
8382 return &bpf_get_socket_cookie_proto
;
8383 case BPF_FUNC_get_socket_uid
:
8384 return &bpf_get_socket_uid_proto
;
8385 case BPF_FUNC_sk_redirect_map
:
8386 return &bpf_sk_redirect_map_proto
;
8387 case BPF_FUNC_sk_redirect_hash
:
8388 return &bpf_sk_redirect_hash_proto
;
8389 case BPF_FUNC_perf_event_output
:
8390 return &bpf_skb_event_output_proto
;
8392 case BPF_FUNC_sk_lookup_tcp
:
8393 return &bpf_sk_lookup_tcp_proto
;
8394 case BPF_FUNC_sk_lookup_udp
:
8395 return &bpf_sk_lookup_udp_proto
;
8396 case BPF_FUNC_sk_release
:
8397 return &bpf_sk_release_proto
;
8398 case BPF_FUNC_skc_lookup_tcp
:
8399 return &bpf_skc_lookup_tcp_proto
;
8402 return bpf_sk_base_func_proto(func_id
, prog
);
8406 static const struct bpf_func_proto
*
8407 flow_dissector_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
8410 case BPF_FUNC_skb_load_bytes
:
8411 return &bpf_flow_dissector_load_bytes_proto
;
8413 return bpf_sk_base_func_proto(func_id
, prog
);
8417 static const struct bpf_func_proto
*
8418 lwt_out_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
8421 case BPF_FUNC_skb_load_bytes
:
8422 return &bpf_skb_load_bytes_proto
;
8423 case BPF_FUNC_skb_pull_data
:
8424 return &bpf_skb_pull_data_proto
;
8425 case BPF_FUNC_csum_diff
:
8426 return &bpf_csum_diff_proto
;
8427 case BPF_FUNC_get_cgroup_classid
:
8428 return &bpf_get_cgroup_classid_proto
;
8429 case BPF_FUNC_get_route_realm
:
8430 return &bpf_get_route_realm_proto
;
8431 case BPF_FUNC_get_hash_recalc
:
8432 return &bpf_get_hash_recalc_proto
;
8433 case BPF_FUNC_perf_event_output
:
8434 return &bpf_skb_event_output_proto
;
8435 case BPF_FUNC_get_smp_processor_id
:
8436 return &bpf_get_smp_processor_id_proto
;
8437 case BPF_FUNC_skb_under_cgroup
:
8438 return &bpf_skb_under_cgroup_proto
;
8440 return bpf_sk_base_func_proto(func_id
, prog
);
8444 static const struct bpf_func_proto
*
8445 lwt_in_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
8448 case BPF_FUNC_lwt_push_encap
:
8449 return &bpf_lwt_in_push_encap_proto
;
8451 return lwt_out_func_proto(func_id
, prog
);
8455 static const struct bpf_func_proto
*
8456 lwt_xmit_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
8459 case BPF_FUNC_skb_get_tunnel_key
:
8460 return &bpf_skb_get_tunnel_key_proto
;
8461 case BPF_FUNC_skb_set_tunnel_key
:
8462 return bpf_get_skb_set_tunnel_proto(func_id
);
8463 case BPF_FUNC_skb_get_tunnel_opt
:
8464 return &bpf_skb_get_tunnel_opt_proto
;
8465 case BPF_FUNC_skb_set_tunnel_opt
:
8466 return bpf_get_skb_set_tunnel_proto(func_id
);
8467 case BPF_FUNC_redirect
:
8468 return &bpf_redirect_proto
;
8469 case BPF_FUNC_clone_redirect
:
8470 return &bpf_clone_redirect_proto
;
8471 case BPF_FUNC_skb_change_tail
:
8472 return &bpf_skb_change_tail_proto
;
8473 case BPF_FUNC_skb_change_head
:
8474 return &bpf_skb_change_head_proto
;
8475 case BPF_FUNC_skb_store_bytes
:
8476 return &bpf_skb_store_bytes_proto
;
8477 case BPF_FUNC_csum_update
:
8478 return &bpf_csum_update_proto
;
8479 case BPF_FUNC_csum_level
:
8480 return &bpf_csum_level_proto
;
8481 case BPF_FUNC_l3_csum_replace
:
8482 return &bpf_l3_csum_replace_proto
;
8483 case BPF_FUNC_l4_csum_replace
:
8484 return &bpf_l4_csum_replace_proto
;
8485 case BPF_FUNC_set_hash_invalid
:
8486 return &bpf_set_hash_invalid_proto
;
8487 case BPF_FUNC_lwt_push_encap
:
8488 return &bpf_lwt_xmit_push_encap_proto
;
8490 return lwt_out_func_proto(func_id
, prog
);
8494 static const struct bpf_func_proto
*
8495 lwt_seg6local_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
8498 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
8499 case BPF_FUNC_lwt_seg6_store_bytes
:
8500 return &bpf_lwt_seg6_store_bytes_proto
;
8501 case BPF_FUNC_lwt_seg6_action
:
8502 return &bpf_lwt_seg6_action_proto
;
8503 case BPF_FUNC_lwt_seg6_adjust_srh
:
8504 return &bpf_lwt_seg6_adjust_srh_proto
;
8507 return lwt_out_func_proto(func_id
, prog
);
8511 static bool bpf_skb_is_valid_access(int off
, int size
, enum bpf_access_type type
,
8512 const struct bpf_prog
*prog
,
8513 struct bpf_insn_access_aux
*info
)
8515 const int size_default
= sizeof(__u32
);
8517 if (off
< 0 || off
>= sizeof(struct __sk_buff
))
8520 /* The verifier guarantees that size > 0. */
8521 if (off
% size
!= 0)
8525 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
8526 if (off
+ size
> offsetofend(struct __sk_buff
, cb
[4]))
8529 case bpf_ctx_range_till(struct __sk_buff
, remote_ip6
[0], remote_ip6
[3]):
8530 case bpf_ctx_range_till(struct __sk_buff
, local_ip6
[0], local_ip6
[3]):
8531 case bpf_ctx_range_till(struct __sk_buff
, remote_ip4
, remote_ip4
):
8532 case bpf_ctx_range_till(struct __sk_buff
, local_ip4
, local_ip4
):
8533 case bpf_ctx_range(struct __sk_buff
, data
):
8534 case bpf_ctx_range(struct __sk_buff
, data_meta
):
8535 case bpf_ctx_range(struct __sk_buff
, data_end
):
8536 if (size
!= size_default
)
8539 case bpf_ctx_range_ptr(struct __sk_buff
, flow_keys
):
8541 case bpf_ctx_range(struct __sk_buff
, hwtstamp
):
8542 if (type
== BPF_WRITE
|| size
!= sizeof(__u64
))
8545 case bpf_ctx_range(struct __sk_buff
, tstamp
):
8546 if (size
!= sizeof(__u64
))
8549 case offsetof(struct __sk_buff
, sk
):
8550 if (type
== BPF_WRITE
|| size
!= sizeof(__u64
))
8552 info
->reg_type
= PTR_TO_SOCK_COMMON_OR_NULL
;
8554 case offsetof(struct __sk_buff
, tstamp_type
):
8556 case offsetofend(struct __sk_buff
, tstamp_type
) ... offsetof(struct __sk_buff
, hwtstamp
) - 1:
8557 /* Explicitly prohibit access to padding in __sk_buff. */
8560 /* Only narrow read access allowed for now. */
8561 if (type
== BPF_WRITE
) {
8562 if (size
!= size_default
)
8565 bpf_ctx_record_field_size(info
, size_default
);
8566 if (!bpf_ctx_narrow_access_ok(off
, size
, size_default
))
8574 static bool sk_filter_is_valid_access(int off
, int size
,
8575 enum bpf_access_type type
,
8576 const struct bpf_prog
*prog
,
8577 struct bpf_insn_access_aux
*info
)
8580 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
8581 case bpf_ctx_range(struct __sk_buff
, data
):
8582 case bpf_ctx_range(struct __sk_buff
, data_meta
):
8583 case bpf_ctx_range(struct __sk_buff
, data_end
):
8584 case bpf_ctx_range_till(struct __sk_buff
, family
, local_port
):
8585 case bpf_ctx_range(struct __sk_buff
, tstamp
):
8586 case bpf_ctx_range(struct __sk_buff
, wire_len
):
8587 case bpf_ctx_range(struct __sk_buff
, hwtstamp
):
8591 if (type
== BPF_WRITE
) {
8593 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
8600 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
8603 static bool cg_skb_is_valid_access(int off
, int size
,
8604 enum bpf_access_type type
,
8605 const struct bpf_prog
*prog
,
8606 struct bpf_insn_access_aux
*info
)
8609 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
8610 case bpf_ctx_range(struct __sk_buff
, data_meta
):
8611 case bpf_ctx_range(struct __sk_buff
, wire_len
):
8613 case bpf_ctx_range(struct __sk_buff
, data
):
8614 case bpf_ctx_range(struct __sk_buff
, data_end
):
8615 if (!bpf_token_capable(prog
->aux
->token
, CAP_BPF
))
8620 if (type
== BPF_WRITE
) {
8622 case bpf_ctx_range(struct __sk_buff
, mark
):
8623 case bpf_ctx_range(struct __sk_buff
, priority
):
8624 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
8626 case bpf_ctx_range(struct __sk_buff
, tstamp
):
8627 if (!bpf_token_capable(prog
->aux
->token
, CAP_BPF
))
8636 case bpf_ctx_range(struct __sk_buff
, data
):
8637 info
->reg_type
= PTR_TO_PACKET
;
8639 case bpf_ctx_range(struct __sk_buff
, data_end
):
8640 info
->reg_type
= PTR_TO_PACKET_END
;
8644 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
8647 static bool lwt_is_valid_access(int off
, int size
,
8648 enum bpf_access_type type
,
8649 const struct bpf_prog
*prog
,
8650 struct bpf_insn_access_aux
*info
)
8653 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
8654 case bpf_ctx_range_till(struct __sk_buff
, family
, local_port
):
8655 case bpf_ctx_range(struct __sk_buff
, data_meta
):
8656 case bpf_ctx_range(struct __sk_buff
, tstamp
):
8657 case bpf_ctx_range(struct __sk_buff
, wire_len
):
8658 case bpf_ctx_range(struct __sk_buff
, hwtstamp
):
8662 if (type
== BPF_WRITE
) {
8664 case bpf_ctx_range(struct __sk_buff
, mark
):
8665 case bpf_ctx_range(struct __sk_buff
, priority
):
8666 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
8674 case bpf_ctx_range(struct __sk_buff
, data
):
8675 info
->reg_type
= PTR_TO_PACKET
;
8677 case bpf_ctx_range(struct __sk_buff
, data_end
):
8678 info
->reg_type
= PTR_TO_PACKET_END
;
8682 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
8685 /* Attach type specific accesses */
8686 static bool __sock_filter_check_attach_type(int off
,
8687 enum bpf_access_type access_type
,
8688 enum bpf_attach_type attach_type
)
8691 case offsetof(struct bpf_sock
, bound_dev_if
):
8692 case offsetof(struct bpf_sock
, mark
):
8693 case offsetof(struct bpf_sock
, priority
):
8694 switch (attach_type
) {
8695 case BPF_CGROUP_INET_SOCK_CREATE
:
8696 case BPF_CGROUP_INET_SOCK_RELEASE
:
8701 case bpf_ctx_range(struct bpf_sock
, src_ip4
):
8702 switch (attach_type
) {
8703 case BPF_CGROUP_INET4_POST_BIND
:
8708 case bpf_ctx_range_till(struct bpf_sock
, src_ip6
[0], src_ip6
[3]):
8709 switch (attach_type
) {
8710 case BPF_CGROUP_INET6_POST_BIND
:
8715 case bpf_ctx_range(struct bpf_sock
, src_port
):
8716 switch (attach_type
) {
8717 case BPF_CGROUP_INET4_POST_BIND
:
8718 case BPF_CGROUP_INET6_POST_BIND
:
8725 return access_type
== BPF_READ
;
8730 bool bpf_sock_common_is_valid_access(int off
, int size
,
8731 enum bpf_access_type type
,
8732 struct bpf_insn_access_aux
*info
)
8735 case bpf_ctx_range_till(struct bpf_sock
, type
, priority
):
8738 return bpf_sock_is_valid_access(off
, size
, type
, info
);
8742 bool bpf_sock_is_valid_access(int off
, int size
, enum bpf_access_type type
,
8743 struct bpf_insn_access_aux
*info
)
8745 const int size_default
= sizeof(__u32
);
8748 if (off
< 0 || off
>= sizeof(struct bpf_sock
))
8750 if (off
% size
!= 0)
8754 case offsetof(struct bpf_sock
, state
):
8755 case offsetof(struct bpf_sock
, family
):
8756 case offsetof(struct bpf_sock
, type
):
8757 case offsetof(struct bpf_sock
, protocol
):
8758 case offsetof(struct bpf_sock
, src_port
):
8759 case offsetof(struct bpf_sock
, rx_queue_mapping
):
8760 case bpf_ctx_range(struct bpf_sock
, src_ip4
):
8761 case bpf_ctx_range_till(struct bpf_sock
, src_ip6
[0], src_ip6
[3]):
8762 case bpf_ctx_range(struct bpf_sock
, dst_ip4
):
8763 case bpf_ctx_range_till(struct bpf_sock
, dst_ip6
[0], dst_ip6
[3]):
8764 bpf_ctx_record_field_size(info
, size_default
);
8765 return bpf_ctx_narrow_access_ok(off
, size
, size_default
);
8766 case bpf_ctx_range(struct bpf_sock
, dst_port
):
8767 field_size
= size
== size_default
?
8768 size_default
: sizeof_field(struct bpf_sock
, dst_port
);
8769 bpf_ctx_record_field_size(info
, field_size
);
8770 return bpf_ctx_narrow_access_ok(off
, size
, field_size
);
8771 case offsetofend(struct bpf_sock
, dst_port
) ...
8772 offsetof(struct bpf_sock
, dst_ip4
) - 1:
8776 return size
== size_default
;
8779 static bool sock_filter_is_valid_access(int off
, int size
,
8780 enum bpf_access_type type
,
8781 const struct bpf_prog
*prog
,
8782 struct bpf_insn_access_aux
*info
)
8784 if (!bpf_sock_is_valid_access(off
, size
, type
, info
))
8786 return __sock_filter_check_attach_type(off
, type
,
8787 prog
->expected_attach_type
);
8790 static int bpf_noop_prologue(struct bpf_insn
*insn_buf
, bool direct_write
,
8791 const struct bpf_prog
*prog
)
8793 /* Neither direct read nor direct write requires any preliminary
8799 static int bpf_unclone_prologue(struct bpf_insn
*insn_buf
, bool direct_write
,
8800 const struct bpf_prog
*prog
, int drop_verdict
)
8802 struct bpf_insn
*insn
= insn_buf
;
8807 /* if (!skb->cloned)
8810 * (Fast-path, otherwise approximation that we might be
8811 * a clone, do the rest in helper.)
8813 *insn
++ = BPF_LDX_MEM(BPF_B
, BPF_REG_6
, BPF_REG_1
, CLONED_OFFSET
);
8814 *insn
++ = BPF_ALU32_IMM(BPF_AND
, BPF_REG_6
, CLONED_MASK
);
8815 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, BPF_REG_6
, 0, 7);
8817 /* ret = bpf_skb_pull_data(skb, 0); */
8818 *insn
++ = BPF_MOV64_REG(BPF_REG_6
, BPF_REG_1
);
8819 *insn
++ = BPF_ALU64_REG(BPF_XOR
, BPF_REG_2
, BPF_REG_2
);
8820 *insn
++ = BPF_RAW_INSN(BPF_JMP
| BPF_CALL
, 0, 0, 0,
8821 BPF_FUNC_skb_pull_data
);
8824 * return TC_ACT_SHOT;
8826 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, BPF_REG_0
, 0, 2);
8827 *insn
++ = BPF_ALU32_IMM(BPF_MOV
, BPF_REG_0
, drop_verdict
);
8828 *insn
++ = BPF_EXIT_INSN();
8831 *insn
++ = BPF_MOV64_REG(BPF_REG_1
, BPF_REG_6
);
8833 *insn
++ = prog
->insnsi
[0];
8835 return insn
- insn_buf
;
8838 static int bpf_gen_ld_abs(const struct bpf_insn
*orig
,
8839 struct bpf_insn
*insn_buf
)
8841 bool indirect
= BPF_MODE(orig
->code
) == BPF_IND
;
8842 struct bpf_insn
*insn
= insn_buf
;
8845 *insn
++ = BPF_MOV64_IMM(BPF_REG_2
, orig
->imm
);
8847 *insn
++ = BPF_MOV64_REG(BPF_REG_2
, orig
->src_reg
);
8849 *insn
++ = BPF_ALU64_IMM(BPF_ADD
, BPF_REG_2
, orig
->imm
);
8851 /* We're guaranteed here that CTX is in R6. */
8852 *insn
++ = BPF_MOV64_REG(BPF_REG_1
, BPF_REG_CTX
);
8854 switch (BPF_SIZE(orig
->code
)) {
8856 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache
);
8859 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache
);
8862 *insn
++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache
);
8866 *insn
++ = BPF_JMP_IMM(BPF_JSGE
, BPF_REG_0
, 0, 2);
8867 *insn
++ = BPF_ALU32_REG(BPF_XOR
, BPF_REG_0
, BPF_REG_0
);
8868 *insn
++ = BPF_EXIT_INSN();
8870 return insn
- insn_buf
;
8873 static int tc_cls_act_prologue(struct bpf_insn
*insn_buf
, bool direct_write
,
8874 const struct bpf_prog
*prog
)
8876 return bpf_unclone_prologue(insn_buf
, direct_write
, prog
, TC_ACT_SHOT
);
8879 static bool tc_cls_act_is_valid_access(int off
, int size
,
8880 enum bpf_access_type type
,
8881 const struct bpf_prog
*prog
,
8882 struct bpf_insn_access_aux
*info
)
8884 if (type
== BPF_WRITE
) {
8886 case bpf_ctx_range(struct __sk_buff
, mark
):
8887 case bpf_ctx_range(struct __sk_buff
, tc_index
):
8888 case bpf_ctx_range(struct __sk_buff
, priority
):
8889 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
8890 case bpf_ctx_range_till(struct __sk_buff
, cb
[0], cb
[4]):
8891 case bpf_ctx_range(struct __sk_buff
, tstamp
):
8892 case bpf_ctx_range(struct __sk_buff
, queue_mapping
):
8900 case bpf_ctx_range(struct __sk_buff
, data
):
8901 info
->reg_type
= PTR_TO_PACKET
;
8903 case bpf_ctx_range(struct __sk_buff
, data_meta
):
8904 info
->reg_type
= PTR_TO_PACKET_META
;
8906 case bpf_ctx_range(struct __sk_buff
, data_end
):
8907 info
->reg_type
= PTR_TO_PACKET_END
;
8909 case bpf_ctx_range_till(struct __sk_buff
, family
, local_port
):
8911 case offsetof(struct __sk_buff
, tstamp_type
):
8912 /* The convert_ctx_access() on reading and writing
8913 * __sk_buff->tstamp depends on whether the bpf prog
8914 * has used __sk_buff->tstamp_type or not.
8915 * Thus, we need to set prog->tstamp_type_access
8916 * earlier during is_valid_access() here.
8918 ((struct bpf_prog
*)prog
)->tstamp_type_access
= 1;
8919 return size
== sizeof(__u8
);
8922 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
8925 DEFINE_MUTEX(nf_conn_btf_access_lock
);
8926 EXPORT_SYMBOL_GPL(nf_conn_btf_access_lock
);
8928 int (*nfct_btf_struct_access
)(struct bpf_verifier_log
*log
,
8929 const struct bpf_reg_state
*reg
,
8931 EXPORT_SYMBOL_GPL(nfct_btf_struct_access
);
8933 static int tc_cls_act_btf_struct_access(struct bpf_verifier_log
*log
,
8934 const struct bpf_reg_state
*reg
,
8939 mutex_lock(&nf_conn_btf_access_lock
);
8940 if (nfct_btf_struct_access
)
8941 ret
= nfct_btf_struct_access(log
, reg
, off
, size
);
8942 mutex_unlock(&nf_conn_btf_access_lock
);
8947 static bool __is_valid_xdp_access(int off
, int size
)
8949 if (off
< 0 || off
>= sizeof(struct xdp_md
))
8951 if (off
% size
!= 0)
8953 if (size
!= sizeof(__u32
))
8959 static bool xdp_is_valid_access(int off
, int size
,
8960 enum bpf_access_type type
,
8961 const struct bpf_prog
*prog
,
8962 struct bpf_insn_access_aux
*info
)
8964 if (prog
->expected_attach_type
!= BPF_XDP_DEVMAP
) {
8966 case offsetof(struct xdp_md
, egress_ifindex
):
8971 if (type
== BPF_WRITE
) {
8972 if (bpf_prog_is_offloaded(prog
->aux
)) {
8974 case offsetof(struct xdp_md
, rx_queue_index
):
8975 return __is_valid_xdp_access(off
, size
);
8982 case offsetof(struct xdp_md
, data
):
8983 info
->reg_type
= PTR_TO_PACKET
;
8985 case offsetof(struct xdp_md
, data_meta
):
8986 info
->reg_type
= PTR_TO_PACKET_META
;
8988 case offsetof(struct xdp_md
, data_end
):
8989 info
->reg_type
= PTR_TO_PACKET_END
;
8993 return __is_valid_xdp_access(off
, size
);
8996 void bpf_warn_invalid_xdp_action(struct net_device
*dev
, struct bpf_prog
*prog
, u32 act
)
8998 const u32 act_max
= XDP_REDIRECT
;
9000 pr_warn_once("%s XDP return value %u on prog %s (id %d) dev %s, expect packet loss!\n",
9001 act
> act_max
? "Illegal" : "Driver unsupported",
9002 act
, prog
->aux
->name
, prog
->aux
->id
, dev
? dev
->name
: "N/A");
9004 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action
);
9006 static int xdp_btf_struct_access(struct bpf_verifier_log
*log
,
9007 const struct bpf_reg_state
*reg
,
9012 mutex_lock(&nf_conn_btf_access_lock
);
9013 if (nfct_btf_struct_access
)
9014 ret
= nfct_btf_struct_access(log
, reg
, off
, size
);
9015 mutex_unlock(&nf_conn_btf_access_lock
);
9020 static bool sock_addr_is_valid_access(int off
, int size
,
9021 enum bpf_access_type type
,
9022 const struct bpf_prog
*prog
,
9023 struct bpf_insn_access_aux
*info
)
9025 const int size_default
= sizeof(__u32
);
9027 if (off
< 0 || off
>= sizeof(struct bpf_sock_addr
))
9029 if (off
% size
!= 0)
9032 /* Disallow access to fields not belonging to the attach type's address
9036 case bpf_ctx_range(struct bpf_sock_addr
, user_ip4
):
9037 switch (prog
->expected_attach_type
) {
9038 case BPF_CGROUP_INET4_BIND
:
9039 case BPF_CGROUP_INET4_CONNECT
:
9040 case BPF_CGROUP_INET4_GETPEERNAME
:
9041 case BPF_CGROUP_INET4_GETSOCKNAME
:
9042 case BPF_CGROUP_UDP4_SENDMSG
:
9043 case BPF_CGROUP_UDP4_RECVMSG
:
9049 case bpf_ctx_range_till(struct bpf_sock_addr
, user_ip6
[0], user_ip6
[3]):
9050 switch (prog
->expected_attach_type
) {
9051 case BPF_CGROUP_INET6_BIND
:
9052 case BPF_CGROUP_INET6_CONNECT
:
9053 case BPF_CGROUP_INET6_GETPEERNAME
:
9054 case BPF_CGROUP_INET6_GETSOCKNAME
:
9055 case BPF_CGROUP_UDP6_SENDMSG
:
9056 case BPF_CGROUP_UDP6_RECVMSG
:
9062 case bpf_ctx_range(struct bpf_sock_addr
, msg_src_ip4
):
9063 switch (prog
->expected_attach_type
) {
9064 case BPF_CGROUP_UDP4_SENDMSG
:
9070 case bpf_ctx_range_till(struct bpf_sock_addr
, msg_src_ip6
[0],
9072 switch (prog
->expected_attach_type
) {
9073 case BPF_CGROUP_UDP6_SENDMSG
:
9082 case bpf_ctx_range(struct bpf_sock_addr
, user_ip4
):
9083 case bpf_ctx_range_till(struct bpf_sock_addr
, user_ip6
[0], user_ip6
[3]):
9084 case bpf_ctx_range(struct bpf_sock_addr
, msg_src_ip4
):
9085 case bpf_ctx_range_till(struct bpf_sock_addr
, msg_src_ip6
[0],
9087 case bpf_ctx_range(struct bpf_sock_addr
, user_port
):
9088 if (type
== BPF_READ
) {
9089 bpf_ctx_record_field_size(info
, size_default
);
9091 if (bpf_ctx_wide_access_ok(off
, size
,
9092 struct bpf_sock_addr
,
9096 if (bpf_ctx_wide_access_ok(off
, size
,
9097 struct bpf_sock_addr
,
9101 if (!bpf_ctx_narrow_access_ok(off
, size
, size_default
))
9104 if (bpf_ctx_wide_access_ok(off
, size
,
9105 struct bpf_sock_addr
,
9109 if (bpf_ctx_wide_access_ok(off
, size
,
9110 struct bpf_sock_addr
,
9114 if (size
!= size_default
)
9118 case offsetof(struct bpf_sock_addr
, sk
):
9119 if (type
!= BPF_READ
)
9121 if (size
!= sizeof(__u64
))
9123 info
->reg_type
= PTR_TO_SOCKET
;
9126 if (type
== BPF_READ
) {
9127 if (size
!= size_default
)
9137 static bool sock_ops_is_valid_access(int off
, int size
,
9138 enum bpf_access_type type
,
9139 const struct bpf_prog
*prog
,
9140 struct bpf_insn_access_aux
*info
)
9142 const int size_default
= sizeof(__u32
);
9144 if (off
< 0 || off
>= sizeof(struct bpf_sock_ops
))
9147 /* The verifier guarantees that size > 0. */
9148 if (off
% size
!= 0)
9151 if (type
== BPF_WRITE
) {
9153 case offsetof(struct bpf_sock_ops
, reply
):
9154 case offsetof(struct bpf_sock_ops
, sk_txhash
):
9155 if (size
!= size_default
)
9163 case bpf_ctx_range_till(struct bpf_sock_ops
, bytes_received
,
9165 if (size
!= sizeof(__u64
))
9168 case offsetof(struct bpf_sock_ops
, sk
):
9169 if (size
!= sizeof(__u64
))
9171 info
->reg_type
= PTR_TO_SOCKET_OR_NULL
;
9173 case offsetof(struct bpf_sock_ops
, skb_data
):
9174 if (size
!= sizeof(__u64
))
9176 info
->reg_type
= PTR_TO_PACKET
;
9178 case offsetof(struct bpf_sock_ops
, skb_data_end
):
9179 if (size
!= sizeof(__u64
))
9181 info
->reg_type
= PTR_TO_PACKET_END
;
9183 case offsetof(struct bpf_sock_ops
, skb_tcp_flags
):
9184 bpf_ctx_record_field_size(info
, size_default
);
9185 return bpf_ctx_narrow_access_ok(off
, size
,
9187 case offsetof(struct bpf_sock_ops
, skb_hwtstamp
):
9188 if (size
!= sizeof(__u64
))
9192 if (size
!= size_default
)
9201 static int sk_skb_prologue(struct bpf_insn
*insn_buf
, bool direct_write
,
9202 const struct bpf_prog
*prog
)
9204 return bpf_unclone_prologue(insn_buf
, direct_write
, prog
, SK_DROP
);
9207 static bool sk_skb_is_valid_access(int off
, int size
,
9208 enum bpf_access_type type
,
9209 const struct bpf_prog
*prog
,
9210 struct bpf_insn_access_aux
*info
)
9213 case bpf_ctx_range(struct __sk_buff
, tc_classid
):
9214 case bpf_ctx_range(struct __sk_buff
, data_meta
):
9215 case bpf_ctx_range(struct __sk_buff
, tstamp
):
9216 case bpf_ctx_range(struct __sk_buff
, wire_len
):
9217 case bpf_ctx_range(struct __sk_buff
, hwtstamp
):
9221 if (type
== BPF_WRITE
) {
9223 case bpf_ctx_range(struct __sk_buff
, tc_index
):
9224 case bpf_ctx_range(struct __sk_buff
, priority
):
9232 case bpf_ctx_range(struct __sk_buff
, mark
):
9234 case bpf_ctx_range(struct __sk_buff
, data
):
9235 info
->reg_type
= PTR_TO_PACKET
;
9237 case bpf_ctx_range(struct __sk_buff
, data_end
):
9238 info
->reg_type
= PTR_TO_PACKET_END
;
9242 return bpf_skb_is_valid_access(off
, size
, type
, prog
, info
);
9245 static bool sk_msg_is_valid_access(int off
, int size
,
9246 enum bpf_access_type type
,
9247 const struct bpf_prog
*prog
,
9248 struct bpf_insn_access_aux
*info
)
9250 if (type
== BPF_WRITE
)
9253 if (off
% size
!= 0)
9257 case offsetof(struct sk_msg_md
, data
):
9258 info
->reg_type
= PTR_TO_PACKET
;
9259 if (size
!= sizeof(__u64
))
9262 case offsetof(struct sk_msg_md
, data_end
):
9263 info
->reg_type
= PTR_TO_PACKET_END
;
9264 if (size
!= sizeof(__u64
))
9267 case offsetof(struct sk_msg_md
, sk
):
9268 if (size
!= sizeof(__u64
))
9270 info
->reg_type
= PTR_TO_SOCKET
;
9272 case bpf_ctx_range(struct sk_msg_md
, family
):
9273 case bpf_ctx_range(struct sk_msg_md
, remote_ip4
):
9274 case bpf_ctx_range(struct sk_msg_md
, local_ip4
):
9275 case bpf_ctx_range_till(struct sk_msg_md
, remote_ip6
[0], remote_ip6
[3]):
9276 case bpf_ctx_range_till(struct sk_msg_md
, local_ip6
[0], local_ip6
[3]):
9277 case bpf_ctx_range(struct sk_msg_md
, remote_port
):
9278 case bpf_ctx_range(struct sk_msg_md
, local_port
):
9279 case bpf_ctx_range(struct sk_msg_md
, size
):
9280 if (size
!= sizeof(__u32
))
9289 static bool flow_dissector_is_valid_access(int off
, int size
,
9290 enum bpf_access_type type
,
9291 const struct bpf_prog
*prog
,
9292 struct bpf_insn_access_aux
*info
)
9294 const int size_default
= sizeof(__u32
);
9296 if (off
< 0 || off
>= sizeof(struct __sk_buff
))
9299 if (type
== BPF_WRITE
)
9303 case bpf_ctx_range(struct __sk_buff
, data
):
9304 if (size
!= size_default
)
9306 info
->reg_type
= PTR_TO_PACKET
;
9308 case bpf_ctx_range(struct __sk_buff
, data_end
):
9309 if (size
!= size_default
)
9311 info
->reg_type
= PTR_TO_PACKET_END
;
9313 case bpf_ctx_range_ptr(struct __sk_buff
, flow_keys
):
9314 if (size
!= sizeof(__u64
))
9316 info
->reg_type
= PTR_TO_FLOW_KEYS
;
9323 static u32
flow_dissector_convert_ctx_access(enum bpf_access_type type
,
9324 const struct bpf_insn
*si
,
9325 struct bpf_insn
*insn_buf
,
9326 struct bpf_prog
*prog
,
9330 struct bpf_insn
*insn
= insn_buf
;
9333 case offsetof(struct __sk_buff
, data
):
9334 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector
, data
),
9335 si
->dst_reg
, si
->src_reg
,
9336 offsetof(struct bpf_flow_dissector
, data
));
9339 case offsetof(struct __sk_buff
, data_end
):
9340 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector
, data_end
),
9341 si
->dst_reg
, si
->src_reg
,
9342 offsetof(struct bpf_flow_dissector
, data_end
));
9345 case offsetof(struct __sk_buff
, flow_keys
):
9346 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector
, flow_keys
),
9347 si
->dst_reg
, si
->src_reg
,
9348 offsetof(struct bpf_flow_dissector
, flow_keys
));
9352 return insn
- insn_buf
;
9355 static struct bpf_insn
*bpf_convert_tstamp_type_read(const struct bpf_insn
*si
,
9356 struct bpf_insn
*insn
)
9358 __u8 value_reg
= si
->dst_reg
;
9359 __u8 skb_reg
= si
->src_reg
;
9360 /* AX is needed because src_reg and dst_reg could be the same */
9361 __u8 tmp_reg
= BPF_REG_AX
;
9363 *insn
++ = BPF_LDX_MEM(BPF_B
, tmp_reg
, skb_reg
,
9364 SKB_BF_MONO_TC_OFFSET
);
9365 *insn
++ = BPF_JMP32_IMM(BPF_JSET
, tmp_reg
,
9366 SKB_MONO_DELIVERY_TIME_MASK
, 2);
9367 *insn
++ = BPF_MOV32_IMM(value_reg
, BPF_SKB_TSTAMP_UNSPEC
);
9368 *insn
++ = BPF_JMP_A(1);
9369 *insn
++ = BPF_MOV32_IMM(value_reg
, BPF_SKB_TSTAMP_DELIVERY_MONO
);
9374 static struct bpf_insn
*bpf_convert_shinfo_access(__u8 dst_reg
, __u8 skb_reg
,
9375 struct bpf_insn
*insn
)
9377 /* si->dst_reg = skb_shinfo(SKB); */
9378 #ifdef NET_SKBUFF_DATA_USES_OFFSET
9379 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, end
),
9380 BPF_REG_AX
, skb_reg
,
9381 offsetof(struct sk_buff
, end
));
9382 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, head
),
9384 offsetof(struct sk_buff
, head
));
9385 *insn
++ = BPF_ALU64_REG(BPF_ADD
, dst_reg
, BPF_REG_AX
);
9387 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, end
),
9389 offsetof(struct sk_buff
, end
));
9395 static struct bpf_insn
*bpf_convert_tstamp_read(const struct bpf_prog
*prog
,
9396 const struct bpf_insn
*si
,
9397 struct bpf_insn
*insn
)
9399 __u8 value_reg
= si
->dst_reg
;
9400 __u8 skb_reg
= si
->src_reg
;
9402 #ifdef CONFIG_NET_XGRESS
9403 /* If the tstamp_type is read,
9404 * the bpf prog is aware the tstamp could have delivery time.
9405 * Thus, read skb->tstamp as is if tstamp_type_access is true.
9407 if (!prog
->tstamp_type_access
) {
9408 /* AX is needed because src_reg and dst_reg could be the same */
9409 __u8 tmp_reg
= BPF_REG_AX
;
9411 *insn
++ = BPF_LDX_MEM(BPF_B
, tmp_reg
, skb_reg
, SKB_BF_MONO_TC_OFFSET
);
9412 *insn
++ = BPF_ALU32_IMM(BPF_AND
, tmp_reg
,
9413 TC_AT_INGRESS_MASK
| SKB_MONO_DELIVERY_TIME_MASK
);
9414 *insn
++ = BPF_JMP32_IMM(BPF_JNE
, tmp_reg
,
9415 TC_AT_INGRESS_MASK
| SKB_MONO_DELIVERY_TIME_MASK
, 2);
9416 /* skb->tc_at_ingress && skb->mono_delivery_time,
9417 * read 0 as the (rcv) timestamp.
9419 *insn
++ = BPF_MOV64_IMM(value_reg
, 0);
9420 *insn
++ = BPF_JMP_A(1);
9424 *insn
++ = BPF_LDX_MEM(BPF_DW
, value_reg
, skb_reg
,
9425 offsetof(struct sk_buff
, tstamp
));
9429 static struct bpf_insn
*bpf_convert_tstamp_write(const struct bpf_prog
*prog
,
9430 const struct bpf_insn
*si
,
9431 struct bpf_insn
*insn
)
9433 __u8 value_reg
= si
->src_reg
;
9434 __u8 skb_reg
= si
->dst_reg
;
9436 #ifdef CONFIG_NET_XGRESS
9437 /* If the tstamp_type is read,
9438 * the bpf prog is aware the tstamp could have delivery time.
9439 * Thus, write skb->tstamp as is if tstamp_type_access is true.
9440 * Otherwise, writing at ingress will have to clear the
9441 * mono_delivery_time bit also.
9443 if (!prog
->tstamp_type_access
) {
9444 __u8 tmp_reg
= BPF_REG_AX
;
9446 *insn
++ = BPF_LDX_MEM(BPF_B
, tmp_reg
, skb_reg
, SKB_BF_MONO_TC_OFFSET
);
9447 /* Writing __sk_buff->tstamp as ingress, goto <clear> */
9448 *insn
++ = BPF_JMP32_IMM(BPF_JSET
, tmp_reg
, TC_AT_INGRESS_MASK
, 1);
9450 *insn
++ = BPF_JMP_A(2);
9451 /* <clear>: mono_delivery_time */
9452 *insn
++ = BPF_ALU32_IMM(BPF_AND
, tmp_reg
, ~SKB_MONO_DELIVERY_TIME_MASK
);
9453 *insn
++ = BPF_STX_MEM(BPF_B
, skb_reg
, tmp_reg
, SKB_BF_MONO_TC_OFFSET
);
9457 /* <store>: skb->tstamp = tstamp */
9458 *insn
++ = BPF_RAW_INSN(BPF_CLASS(si
->code
) | BPF_DW
| BPF_MEM
,
9459 skb_reg
, value_reg
, offsetof(struct sk_buff
, tstamp
), si
->imm
);
9463 #define BPF_EMIT_STORE(size, si, off) \
9464 BPF_RAW_INSN(BPF_CLASS((si)->code) | (size) | BPF_MEM, \
9465 (si)->dst_reg, (si)->src_reg, (off), (si)->imm)
9467 static u32
bpf_convert_ctx_access(enum bpf_access_type type
,
9468 const struct bpf_insn
*si
,
9469 struct bpf_insn
*insn_buf
,
9470 struct bpf_prog
*prog
, u32
*target_size
)
9472 struct bpf_insn
*insn
= insn_buf
;
9476 case offsetof(struct __sk_buff
, len
):
9477 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
9478 bpf_target_off(struct sk_buff
, len
, 4,
9482 case offsetof(struct __sk_buff
, protocol
):
9483 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
9484 bpf_target_off(struct sk_buff
, protocol
, 2,
9488 case offsetof(struct __sk_buff
, vlan_proto
):
9489 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
9490 bpf_target_off(struct sk_buff
, vlan_proto
, 2,
9494 case offsetof(struct __sk_buff
, priority
):
9495 if (type
== BPF_WRITE
)
9496 *insn
++ = BPF_EMIT_STORE(BPF_W
, si
,
9497 bpf_target_off(struct sk_buff
, priority
, 4,
9500 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
9501 bpf_target_off(struct sk_buff
, priority
, 4,
9505 case offsetof(struct __sk_buff
, ingress_ifindex
):
9506 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
9507 bpf_target_off(struct sk_buff
, skb_iif
, 4,
9511 case offsetof(struct __sk_buff
, ifindex
):
9512 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, dev
),
9513 si
->dst_reg
, si
->src_reg
,
9514 offsetof(struct sk_buff
, dev
));
9515 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, si
->dst_reg
, 0, 1);
9516 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
9517 bpf_target_off(struct net_device
, ifindex
, 4,
9521 case offsetof(struct __sk_buff
, hash
):
9522 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
9523 bpf_target_off(struct sk_buff
, hash
, 4,
9527 case offsetof(struct __sk_buff
, mark
):
9528 if (type
== BPF_WRITE
)
9529 *insn
++ = BPF_EMIT_STORE(BPF_W
, si
,
9530 bpf_target_off(struct sk_buff
, mark
, 4,
9533 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
9534 bpf_target_off(struct sk_buff
, mark
, 4,
9538 case offsetof(struct __sk_buff
, pkt_type
):
9540 *insn
++ = BPF_LDX_MEM(BPF_B
, si
->dst_reg
, si
->src_reg
,
9542 *insn
++ = BPF_ALU32_IMM(BPF_AND
, si
->dst_reg
, PKT_TYPE_MAX
);
9543 #ifdef __BIG_ENDIAN_BITFIELD
9544 *insn
++ = BPF_ALU32_IMM(BPF_RSH
, si
->dst_reg
, 5);
9548 case offsetof(struct __sk_buff
, queue_mapping
):
9549 if (type
== BPF_WRITE
) {
9550 u32 off
= bpf_target_off(struct sk_buff
, queue_mapping
, 2, target_size
);
9552 if (BPF_CLASS(si
->code
) == BPF_ST
&& si
->imm
>= NO_QUEUE_MAPPING
) {
9553 *insn
++ = BPF_JMP_A(0); /* noop */
9557 if (BPF_CLASS(si
->code
) == BPF_STX
)
9558 *insn
++ = BPF_JMP_IMM(BPF_JGE
, si
->src_reg
, NO_QUEUE_MAPPING
, 1);
9559 *insn
++ = BPF_EMIT_STORE(BPF_H
, si
, off
);
9561 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
9562 bpf_target_off(struct sk_buff
,
9568 case offsetof(struct __sk_buff
, vlan_present
):
9569 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
9570 bpf_target_off(struct sk_buff
,
9571 vlan_all
, 4, target_size
));
9572 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, si
->dst_reg
, 0, 1);
9573 *insn
++ = BPF_ALU32_IMM(BPF_MOV
, si
->dst_reg
, 1);
9576 case offsetof(struct __sk_buff
, vlan_tci
):
9577 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
9578 bpf_target_off(struct sk_buff
, vlan_tci
, 2,
9582 case offsetof(struct __sk_buff
, cb
[0]) ...
9583 offsetofend(struct __sk_buff
, cb
[4]) - 1:
9584 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb
, data
) < 20);
9585 BUILD_BUG_ON((offsetof(struct sk_buff
, cb
) +
9586 offsetof(struct qdisc_skb_cb
, data
)) %
9589 prog
->cb_access
= 1;
9591 off
-= offsetof(struct __sk_buff
, cb
[0]);
9592 off
+= offsetof(struct sk_buff
, cb
);
9593 off
+= offsetof(struct qdisc_skb_cb
, data
);
9594 if (type
== BPF_WRITE
)
9595 *insn
++ = BPF_EMIT_STORE(BPF_SIZE(si
->code
), si
, off
);
9597 *insn
++ = BPF_LDX_MEM(BPF_SIZE(si
->code
), si
->dst_reg
,
9601 case offsetof(struct __sk_buff
, tc_classid
):
9602 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb
, tc_classid
) != 2);
9605 off
-= offsetof(struct __sk_buff
, tc_classid
);
9606 off
+= offsetof(struct sk_buff
, cb
);
9607 off
+= offsetof(struct qdisc_skb_cb
, tc_classid
);
9609 if (type
== BPF_WRITE
)
9610 *insn
++ = BPF_EMIT_STORE(BPF_H
, si
, off
);
9612 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
,
9616 case offsetof(struct __sk_buff
, data
):
9617 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, data
),
9618 si
->dst_reg
, si
->src_reg
,
9619 offsetof(struct sk_buff
, data
));
9622 case offsetof(struct __sk_buff
, data_meta
):
9624 off
-= offsetof(struct __sk_buff
, data_meta
);
9625 off
+= offsetof(struct sk_buff
, cb
);
9626 off
+= offsetof(struct bpf_skb_data_end
, data_meta
);
9627 *insn
++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si
->dst_reg
,
9631 case offsetof(struct __sk_buff
, data_end
):
9633 off
-= offsetof(struct __sk_buff
, data_end
);
9634 off
+= offsetof(struct sk_buff
, cb
);
9635 off
+= offsetof(struct bpf_skb_data_end
, data_end
);
9636 *insn
++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si
->dst_reg
,
9640 case offsetof(struct __sk_buff
, tc_index
):
9641 #ifdef CONFIG_NET_SCHED
9642 if (type
== BPF_WRITE
)
9643 *insn
++ = BPF_EMIT_STORE(BPF_H
, si
,
9644 bpf_target_off(struct sk_buff
, tc_index
, 2,
9647 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
9648 bpf_target_off(struct sk_buff
, tc_index
, 2,
9652 if (type
== BPF_WRITE
)
9653 *insn
++ = BPF_MOV64_REG(si
->dst_reg
, si
->dst_reg
);
9655 *insn
++ = BPF_MOV64_IMM(si
->dst_reg
, 0);
9659 case offsetof(struct __sk_buff
, napi_id
):
9660 #if defined(CONFIG_NET_RX_BUSY_POLL)
9661 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
9662 bpf_target_off(struct sk_buff
, napi_id
, 4,
9664 *insn
++ = BPF_JMP_IMM(BPF_JGE
, si
->dst_reg
, MIN_NAPI_ID
, 1);
9665 *insn
++ = BPF_MOV64_IMM(si
->dst_reg
, 0);
9668 *insn
++ = BPF_MOV64_IMM(si
->dst_reg
, 0);
9671 case offsetof(struct __sk_buff
, family
):
9672 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_family
) != 2);
9674 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
9675 si
->dst_reg
, si
->src_reg
,
9676 offsetof(struct sk_buff
, sk
));
9677 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
9678 bpf_target_off(struct sock_common
,
9682 case offsetof(struct __sk_buff
, remote_ip4
):
9683 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_daddr
) != 4);
9685 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
9686 si
->dst_reg
, si
->src_reg
,
9687 offsetof(struct sk_buff
, sk
));
9688 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
9689 bpf_target_off(struct sock_common
,
9693 case offsetof(struct __sk_buff
, local_ip4
):
9694 BUILD_BUG_ON(sizeof_field(struct sock_common
,
9695 skc_rcv_saddr
) != 4);
9697 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
9698 si
->dst_reg
, si
->src_reg
,
9699 offsetof(struct sk_buff
, sk
));
9700 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
9701 bpf_target_off(struct sock_common
,
9705 case offsetof(struct __sk_buff
, remote_ip6
[0]) ...
9706 offsetof(struct __sk_buff
, remote_ip6
[3]):
9707 #if IS_ENABLED(CONFIG_IPV6)
9708 BUILD_BUG_ON(sizeof_field(struct sock_common
,
9709 skc_v6_daddr
.s6_addr32
[0]) != 4);
9712 off
-= offsetof(struct __sk_buff
, remote_ip6
[0]);
9714 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
9715 si
->dst_reg
, si
->src_reg
,
9716 offsetof(struct sk_buff
, sk
));
9717 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
9718 offsetof(struct sock_common
,
9719 skc_v6_daddr
.s6_addr32
[0]) +
9722 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
9725 case offsetof(struct __sk_buff
, local_ip6
[0]) ...
9726 offsetof(struct __sk_buff
, local_ip6
[3]):
9727 #if IS_ENABLED(CONFIG_IPV6)
9728 BUILD_BUG_ON(sizeof_field(struct sock_common
,
9729 skc_v6_rcv_saddr
.s6_addr32
[0]) != 4);
9732 off
-= offsetof(struct __sk_buff
, local_ip6
[0]);
9734 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
9735 si
->dst_reg
, si
->src_reg
,
9736 offsetof(struct sk_buff
, sk
));
9737 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
9738 offsetof(struct sock_common
,
9739 skc_v6_rcv_saddr
.s6_addr32
[0]) +
9742 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
9746 case offsetof(struct __sk_buff
, remote_port
):
9747 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_dport
) != 2);
9749 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
9750 si
->dst_reg
, si
->src_reg
,
9751 offsetof(struct sk_buff
, sk
));
9752 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
9753 bpf_target_off(struct sock_common
,
9756 #ifndef __BIG_ENDIAN_BITFIELD
9757 *insn
++ = BPF_ALU32_IMM(BPF_LSH
, si
->dst_reg
, 16);
9761 case offsetof(struct __sk_buff
, local_port
):
9762 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_num
) != 2);
9764 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
9765 si
->dst_reg
, si
->src_reg
,
9766 offsetof(struct sk_buff
, sk
));
9767 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
9768 bpf_target_off(struct sock_common
,
9769 skc_num
, 2, target_size
));
9772 case offsetof(struct __sk_buff
, tstamp
):
9773 BUILD_BUG_ON(sizeof_field(struct sk_buff
, tstamp
) != 8);
9775 if (type
== BPF_WRITE
)
9776 insn
= bpf_convert_tstamp_write(prog
, si
, insn
);
9778 insn
= bpf_convert_tstamp_read(prog
, si
, insn
);
9781 case offsetof(struct __sk_buff
, tstamp_type
):
9782 insn
= bpf_convert_tstamp_type_read(si
, insn
);
9785 case offsetof(struct __sk_buff
, gso_segs
):
9786 insn
= bpf_convert_shinfo_access(si
->dst_reg
, si
->src_reg
, insn
);
9787 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info
, gso_segs
),
9788 si
->dst_reg
, si
->dst_reg
,
9789 bpf_target_off(struct skb_shared_info
,
9793 case offsetof(struct __sk_buff
, gso_size
):
9794 insn
= bpf_convert_shinfo_access(si
->dst_reg
, si
->src_reg
, insn
);
9795 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info
, gso_size
),
9796 si
->dst_reg
, si
->dst_reg
,
9797 bpf_target_off(struct skb_shared_info
,
9801 case offsetof(struct __sk_buff
, wire_len
):
9802 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb
, pkt_len
) != 4);
9805 off
-= offsetof(struct __sk_buff
, wire_len
);
9806 off
+= offsetof(struct sk_buff
, cb
);
9807 off
+= offsetof(struct qdisc_skb_cb
, pkt_len
);
9809 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
, off
);
9812 case offsetof(struct __sk_buff
, sk
):
9813 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, sk
),
9814 si
->dst_reg
, si
->src_reg
,
9815 offsetof(struct sk_buff
, sk
));
9817 case offsetof(struct __sk_buff
, hwtstamp
):
9818 BUILD_BUG_ON(sizeof_field(struct skb_shared_hwtstamps
, hwtstamp
) != 8);
9819 BUILD_BUG_ON(offsetof(struct skb_shared_hwtstamps
, hwtstamp
) != 0);
9821 insn
= bpf_convert_shinfo_access(si
->dst_reg
, si
->src_reg
, insn
);
9822 *insn
++ = BPF_LDX_MEM(BPF_DW
,
9823 si
->dst_reg
, si
->dst_reg
,
9824 bpf_target_off(struct skb_shared_info
,
9830 return insn
- insn_buf
;
9833 u32
bpf_sock_convert_ctx_access(enum bpf_access_type type
,
9834 const struct bpf_insn
*si
,
9835 struct bpf_insn
*insn_buf
,
9836 struct bpf_prog
*prog
, u32
*target_size
)
9838 struct bpf_insn
*insn
= insn_buf
;
9842 case offsetof(struct bpf_sock
, bound_dev_if
):
9843 BUILD_BUG_ON(sizeof_field(struct sock
, sk_bound_dev_if
) != 4);
9845 if (type
== BPF_WRITE
)
9846 *insn
++ = BPF_EMIT_STORE(BPF_W
, si
,
9847 offsetof(struct sock
, sk_bound_dev_if
));
9849 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
9850 offsetof(struct sock
, sk_bound_dev_if
));
9853 case offsetof(struct bpf_sock
, mark
):
9854 BUILD_BUG_ON(sizeof_field(struct sock
, sk_mark
) != 4);
9856 if (type
== BPF_WRITE
)
9857 *insn
++ = BPF_EMIT_STORE(BPF_W
, si
,
9858 offsetof(struct sock
, sk_mark
));
9860 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
9861 offsetof(struct sock
, sk_mark
));
9864 case offsetof(struct bpf_sock
, priority
):
9865 BUILD_BUG_ON(sizeof_field(struct sock
, sk_priority
) != 4);
9867 if (type
== BPF_WRITE
)
9868 *insn
++ = BPF_EMIT_STORE(BPF_W
, si
,
9869 offsetof(struct sock
, sk_priority
));
9871 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
9872 offsetof(struct sock
, sk_priority
));
9875 case offsetof(struct bpf_sock
, family
):
9876 *insn
++ = BPF_LDX_MEM(
9877 BPF_FIELD_SIZEOF(struct sock_common
, skc_family
),
9878 si
->dst_reg
, si
->src_reg
,
9879 bpf_target_off(struct sock_common
,
9881 sizeof_field(struct sock_common
,
9886 case offsetof(struct bpf_sock
, type
):
9887 *insn
++ = BPF_LDX_MEM(
9888 BPF_FIELD_SIZEOF(struct sock
, sk_type
),
9889 si
->dst_reg
, si
->src_reg
,
9890 bpf_target_off(struct sock
, sk_type
,
9891 sizeof_field(struct sock
, sk_type
),
9895 case offsetof(struct bpf_sock
, protocol
):
9896 *insn
++ = BPF_LDX_MEM(
9897 BPF_FIELD_SIZEOF(struct sock
, sk_protocol
),
9898 si
->dst_reg
, si
->src_reg
,
9899 bpf_target_off(struct sock
, sk_protocol
,
9900 sizeof_field(struct sock
, sk_protocol
),
9904 case offsetof(struct bpf_sock
, src_ip4
):
9905 *insn
++ = BPF_LDX_MEM(
9906 BPF_SIZE(si
->code
), si
->dst_reg
, si
->src_reg
,
9907 bpf_target_off(struct sock_common
, skc_rcv_saddr
,
9908 sizeof_field(struct sock_common
,
9913 case offsetof(struct bpf_sock
, dst_ip4
):
9914 *insn
++ = BPF_LDX_MEM(
9915 BPF_SIZE(si
->code
), si
->dst_reg
, si
->src_reg
,
9916 bpf_target_off(struct sock_common
, skc_daddr
,
9917 sizeof_field(struct sock_common
,
9922 case bpf_ctx_range_till(struct bpf_sock
, src_ip6
[0], src_ip6
[3]):
9923 #if IS_ENABLED(CONFIG_IPV6)
9925 off
-= offsetof(struct bpf_sock
, src_ip6
[0]);
9926 *insn
++ = BPF_LDX_MEM(
9927 BPF_SIZE(si
->code
), si
->dst_reg
, si
->src_reg
,
9930 skc_v6_rcv_saddr
.s6_addr32
[0],
9931 sizeof_field(struct sock_common
,
9932 skc_v6_rcv_saddr
.s6_addr32
[0]),
9933 target_size
) + off
);
9936 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
9940 case bpf_ctx_range_till(struct bpf_sock
, dst_ip6
[0], dst_ip6
[3]):
9941 #if IS_ENABLED(CONFIG_IPV6)
9943 off
-= offsetof(struct bpf_sock
, dst_ip6
[0]);
9944 *insn
++ = BPF_LDX_MEM(
9945 BPF_SIZE(si
->code
), si
->dst_reg
, si
->src_reg
,
9946 bpf_target_off(struct sock_common
,
9947 skc_v6_daddr
.s6_addr32
[0],
9948 sizeof_field(struct sock_common
,
9949 skc_v6_daddr
.s6_addr32
[0]),
9950 target_size
) + off
);
9952 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
9957 case offsetof(struct bpf_sock
, src_port
):
9958 *insn
++ = BPF_LDX_MEM(
9959 BPF_FIELD_SIZEOF(struct sock_common
, skc_num
),
9960 si
->dst_reg
, si
->src_reg
,
9961 bpf_target_off(struct sock_common
, skc_num
,
9962 sizeof_field(struct sock_common
,
9967 case offsetof(struct bpf_sock
, dst_port
):
9968 *insn
++ = BPF_LDX_MEM(
9969 BPF_FIELD_SIZEOF(struct sock_common
, skc_dport
),
9970 si
->dst_reg
, si
->src_reg
,
9971 bpf_target_off(struct sock_common
, skc_dport
,
9972 sizeof_field(struct sock_common
,
9977 case offsetof(struct bpf_sock
, state
):
9978 *insn
++ = BPF_LDX_MEM(
9979 BPF_FIELD_SIZEOF(struct sock_common
, skc_state
),
9980 si
->dst_reg
, si
->src_reg
,
9981 bpf_target_off(struct sock_common
, skc_state
,
9982 sizeof_field(struct sock_common
,
9986 case offsetof(struct bpf_sock
, rx_queue_mapping
):
9987 #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING
9988 *insn
++ = BPF_LDX_MEM(
9989 BPF_FIELD_SIZEOF(struct sock
, sk_rx_queue_mapping
),
9990 si
->dst_reg
, si
->src_reg
,
9991 bpf_target_off(struct sock
, sk_rx_queue_mapping
,
9992 sizeof_field(struct sock
,
9993 sk_rx_queue_mapping
),
9995 *insn
++ = BPF_JMP_IMM(BPF_JNE
, si
->dst_reg
, NO_QUEUE_MAPPING
,
9997 *insn
++ = BPF_MOV64_IMM(si
->dst_reg
, -1);
9999 *insn
++ = BPF_MOV64_IMM(si
->dst_reg
, -1);
10005 return insn
- insn_buf
;
10008 static u32
tc_cls_act_convert_ctx_access(enum bpf_access_type type
,
10009 const struct bpf_insn
*si
,
10010 struct bpf_insn
*insn_buf
,
10011 struct bpf_prog
*prog
, u32
*target_size
)
10013 struct bpf_insn
*insn
= insn_buf
;
10016 case offsetof(struct __sk_buff
, ifindex
):
10017 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, dev
),
10018 si
->dst_reg
, si
->src_reg
,
10019 offsetof(struct sk_buff
, dev
));
10020 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
10021 bpf_target_off(struct net_device
, ifindex
, 4,
10025 return bpf_convert_ctx_access(type
, si
, insn_buf
, prog
,
10029 return insn
- insn_buf
;
10032 static u32
xdp_convert_ctx_access(enum bpf_access_type type
,
10033 const struct bpf_insn
*si
,
10034 struct bpf_insn
*insn_buf
,
10035 struct bpf_prog
*prog
, u32
*target_size
)
10037 struct bpf_insn
*insn
= insn_buf
;
10040 case offsetof(struct xdp_md
, data
):
10041 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, data
),
10042 si
->dst_reg
, si
->src_reg
,
10043 offsetof(struct xdp_buff
, data
));
10045 case offsetof(struct xdp_md
, data_meta
):
10046 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, data_meta
),
10047 si
->dst_reg
, si
->src_reg
,
10048 offsetof(struct xdp_buff
, data_meta
));
10050 case offsetof(struct xdp_md
, data_end
):
10051 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, data_end
),
10052 si
->dst_reg
, si
->src_reg
,
10053 offsetof(struct xdp_buff
, data_end
));
10055 case offsetof(struct xdp_md
, ingress_ifindex
):
10056 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, rxq
),
10057 si
->dst_reg
, si
->src_reg
,
10058 offsetof(struct xdp_buff
, rxq
));
10059 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info
, dev
),
10060 si
->dst_reg
, si
->dst_reg
,
10061 offsetof(struct xdp_rxq_info
, dev
));
10062 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
10063 offsetof(struct net_device
, ifindex
));
10065 case offsetof(struct xdp_md
, rx_queue_index
):
10066 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, rxq
),
10067 si
->dst_reg
, si
->src_reg
,
10068 offsetof(struct xdp_buff
, rxq
));
10069 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
10070 offsetof(struct xdp_rxq_info
,
10073 case offsetof(struct xdp_md
, egress_ifindex
):
10074 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff
, txq
),
10075 si
->dst_reg
, si
->src_reg
,
10076 offsetof(struct xdp_buff
, txq
));
10077 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_txq_info
, dev
),
10078 si
->dst_reg
, si
->dst_reg
,
10079 offsetof(struct xdp_txq_info
, dev
));
10080 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
10081 offsetof(struct net_device
, ifindex
));
10085 return insn
- insn_buf
;
10088 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of
10089 * context Structure, F is Field in context structure that contains a pointer
10090 * to Nested Structure of type NS that has the field NF.
10092 * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make
10093 * sure that SIZE is not greater than actual size of S.F.NF.
10095 * If offset OFF is provided, the load happens from that offset relative to
10098 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \
10100 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \
10101 si->src_reg, offsetof(S, F)); \
10102 *insn++ = BPF_LDX_MEM( \
10103 SIZE, si->dst_reg, si->dst_reg, \
10104 bpf_target_off(NS, NF, sizeof_field(NS, NF), \
10109 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \
10110 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \
10111 BPF_FIELD_SIZEOF(NS, NF), 0)
10113 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to
10114 * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation.
10116 * In addition it uses Temporary Field TF (member of struct S) as the 3rd
10117 * "register" since two registers available in convert_ctx_access are not
10118 * enough: we can't override neither SRC, since it contains value to store, nor
10119 * DST since it contains pointer to context that may be used by later
10120 * instructions. But we need a temporary place to save pointer to nested
10121 * structure whose field we want to store to.
10123 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF) \
10125 int tmp_reg = BPF_REG_9; \
10126 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \
10128 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \
10130 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \
10131 offsetof(S, TF)); \
10132 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \
10133 si->dst_reg, offsetof(S, F)); \
10134 *insn++ = BPF_RAW_INSN(SIZE | BPF_MEM | BPF_CLASS(si->code), \
10135 tmp_reg, si->src_reg, \
10136 bpf_target_off(NS, NF, sizeof_field(NS, NF), \
10140 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \
10141 offsetof(S, TF)); \
10144 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \
10147 if (type == BPF_WRITE) { \
10148 SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, \
10151 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \
10152 S, NS, F, NF, SIZE, OFF); \
10156 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \
10157 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \
10158 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF)
10160 static u32
sock_addr_convert_ctx_access(enum bpf_access_type type
,
10161 const struct bpf_insn
*si
,
10162 struct bpf_insn
*insn_buf
,
10163 struct bpf_prog
*prog
, u32
*target_size
)
10165 int off
, port_size
= sizeof_field(struct sockaddr_in6
, sin6_port
);
10166 struct bpf_insn
*insn
= insn_buf
;
10169 case offsetof(struct bpf_sock_addr
, user_family
):
10170 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern
,
10171 struct sockaddr
, uaddr
, sa_family
);
10174 case offsetof(struct bpf_sock_addr
, user_ip4
):
10175 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
10176 struct bpf_sock_addr_kern
, struct sockaddr_in
, uaddr
,
10177 sin_addr
, BPF_SIZE(si
->code
), 0, tmp_reg
);
10180 case bpf_ctx_range_till(struct bpf_sock_addr
, user_ip6
[0], user_ip6
[3]):
10182 off
-= offsetof(struct bpf_sock_addr
, user_ip6
[0]);
10183 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
10184 struct bpf_sock_addr_kern
, struct sockaddr_in6
, uaddr
,
10185 sin6_addr
.s6_addr32
[0], BPF_SIZE(si
->code
), off
,
10189 case offsetof(struct bpf_sock_addr
, user_port
):
10190 /* To get port we need to know sa_family first and then treat
10191 * sockaddr as either sockaddr_in or sockaddr_in6.
10192 * Though we can simplify since port field has same offset and
10193 * size in both structures.
10194 * Here we check this invariant and use just one of the
10195 * structures if it's true.
10197 BUILD_BUG_ON(offsetof(struct sockaddr_in
, sin_port
) !=
10198 offsetof(struct sockaddr_in6
, sin6_port
));
10199 BUILD_BUG_ON(sizeof_field(struct sockaddr_in
, sin_port
) !=
10200 sizeof_field(struct sockaddr_in6
, sin6_port
));
10201 /* Account for sin6_port being smaller than user_port. */
10202 port_size
= min(port_size
, BPF_LDST_BYTES(si
));
10203 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
10204 struct bpf_sock_addr_kern
, struct sockaddr_in6
, uaddr
,
10205 sin6_port
, bytes_to_bpf_size(port_size
), 0, tmp_reg
);
10208 case offsetof(struct bpf_sock_addr
, family
):
10209 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern
,
10210 struct sock
, sk
, sk_family
);
10213 case offsetof(struct bpf_sock_addr
, type
):
10214 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern
,
10215 struct sock
, sk
, sk_type
);
10218 case offsetof(struct bpf_sock_addr
, protocol
):
10219 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern
,
10220 struct sock
, sk
, sk_protocol
);
10223 case offsetof(struct bpf_sock_addr
, msg_src_ip4
):
10224 /* Treat t_ctx as struct in_addr for msg_src_ip4. */
10225 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
10226 struct bpf_sock_addr_kern
, struct in_addr
, t_ctx
,
10227 s_addr
, BPF_SIZE(si
->code
), 0, tmp_reg
);
10230 case bpf_ctx_range_till(struct bpf_sock_addr
, msg_src_ip6
[0],
10233 off
-= offsetof(struct bpf_sock_addr
, msg_src_ip6
[0]);
10234 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */
10235 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
10236 struct bpf_sock_addr_kern
, struct in6_addr
, t_ctx
,
10237 s6_addr32
[0], BPF_SIZE(si
->code
), off
, tmp_reg
);
10239 case offsetof(struct bpf_sock_addr
, sk
):
10240 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern
, sk
),
10241 si
->dst_reg
, si
->src_reg
,
10242 offsetof(struct bpf_sock_addr_kern
, sk
));
10246 return insn
- insn_buf
;
10249 static u32
sock_ops_convert_ctx_access(enum bpf_access_type type
,
10250 const struct bpf_insn
*si
,
10251 struct bpf_insn
*insn_buf
,
10252 struct bpf_prog
*prog
,
10255 struct bpf_insn
*insn
= insn_buf
;
10258 /* Helper macro for adding read access to tcp_sock or sock fields. */
10259 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
10261 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 2; \
10262 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \
10263 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \
10264 if (si->dst_reg == reg || si->src_reg == reg) \
10266 if (si->dst_reg == reg || si->src_reg == reg) \
10268 if (si->dst_reg == si->src_reg) { \
10269 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \
10270 offsetof(struct bpf_sock_ops_kern, \
10272 fullsock_reg = reg; \
10275 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
10276 struct bpf_sock_ops_kern, \
10278 fullsock_reg, si->src_reg, \
10279 offsetof(struct bpf_sock_ops_kern, \
10281 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \
10282 if (si->dst_reg == si->src_reg) \
10283 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \
10284 offsetof(struct bpf_sock_ops_kern, \
10286 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
10287 struct bpf_sock_ops_kern, sk),\
10288 si->dst_reg, si->src_reg, \
10289 offsetof(struct bpf_sock_ops_kern, sk));\
10290 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \
10292 si->dst_reg, si->dst_reg, \
10293 offsetof(OBJ, OBJ_FIELD)); \
10294 if (si->dst_reg == si->src_reg) { \
10295 *insn++ = BPF_JMP_A(1); \
10296 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \
10297 offsetof(struct bpf_sock_ops_kern, \
10302 #define SOCK_OPS_GET_SK() \
10304 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 1; \
10305 if (si->dst_reg == reg || si->src_reg == reg) \
10307 if (si->dst_reg == reg || si->src_reg == reg) \
10309 if (si->dst_reg == si->src_reg) { \
10310 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \
10311 offsetof(struct bpf_sock_ops_kern, \
10313 fullsock_reg = reg; \
10316 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
10317 struct bpf_sock_ops_kern, \
10319 fullsock_reg, si->src_reg, \
10320 offsetof(struct bpf_sock_ops_kern, \
10322 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \
10323 if (si->dst_reg == si->src_reg) \
10324 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \
10325 offsetof(struct bpf_sock_ops_kern, \
10327 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
10328 struct bpf_sock_ops_kern, sk),\
10329 si->dst_reg, si->src_reg, \
10330 offsetof(struct bpf_sock_ops_kern, sk));\
10331 if (si->dst_reg == si->src_reg) { \
10332 *insn++ = BPF_JMP_A(1); \
10333 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \
10334 offsetof(struct bpf_sock_ops_kern, \
10339 #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \
10340 SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock)
10342 /* Helper macro for adding write access to tcp_sock or sock fields.
10343 * The macro is called with two registers, dst_reg which contains a pointer
10344 * to ctx (context) and src_reg which contains the value that should be
10345 * stored. However, we need an additional register since we cannot overwrite
10346 * dst_reg because it may be used later in the program.
10347 * Instead we "borrow" one of the other register. We first save its value
10348 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore
10349 * it at the end of the macro.
10351 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
10353 int reg = BPF_REG_9; \
10354 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \
10355 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \
10356 if (si->dst_reg == reg || si->src_reg == reg) \
10358 if (si->dst_reg == reg || si->src_reg == reg) \
10360 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \
10361 offsetof(struct bpf_sock_ops_kern, \
10363 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
10364 struct bpf_sock_ops_kern, \
10366 reg, si->dst_reg, \
10367 offsetof(struct bpf_sock_ops_kern, \
10369 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \
10370 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
10371 struct bpf_sock_ops_kern, sk),\
10372 reg, si->dst_reg, \
10373 offsetof(struct bpf_sock_ops_kern, sk));\
10374 *insn++ = BPF_RAW_INSN(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD) | \
10375 BPF_MEM | BPF_CLASS(si->code), \
10376 reg, si->src_reg, \
10377 offsetof(OBJ, OBJ_FIELD), \
10379 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \
10380 offsetof(struct bpf_sock_ops_kern, \
10384 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \
10386 if (TYPE == BPF_WRITE) \
10387 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \
10389 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \
10393 case offsetof(struct bpf_sock_ops
, op
):
10394 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern
,
10396 si
->dst_reg
, si
->src_reg
,
10397 offsetof(struct bpf_sock_ops_kern
, op
));
10400 case offsetof(struct bpf_sock_ops
, replylong
[0]) ...
10401 offsetof(struct bpf_sock_ops
, replylong
[3]):
10402 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops
, reply
) !=
10403 sizeof_field(struct bpf_sock_ops_kern
, reply
));
10404 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops
, replylong
) !=
10405 sizeof_field(struct bpf_sock_ops_kern
, replylong
));
10407 off
-= offsetof(struct bpf_sock_ops
, replylong
[0]);
10408 off
+= offsetof(struct bpf_sock_ops_kern
, replylong
[0]);
10409 if (type
== BPF_WRITE
)
10410 *insn
++ = BPF_EMIT_STORE(BPF_W
, si
, off
);
10412 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
10416 case offsetof(struct bpf_sock_ops
, family
):
10417 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_family
) != 2);
10419 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10420 struct bpf_sock_ops_kern
, sk
),
10421 si
->dst_reg
, si
->src_reg
,
10422 offsetof(struct bpf_sock_ops_kern
, sk
));
10423 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
10424 offsetof(struct sock_common
, skc_family
));
10427 case offsetof(struct bpf_sock_ops
, remote_ip4
):
10428 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_daddr
) != 4);
10430 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10431 struct bpf_sock_ops_kern
, sk
),
10432 si
->dst_reg
, si
->src_reg
,
10433 offsetof(struct bpf_sock_ops_kern
, sk
));
10434 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
10435 offsetof(struct sock_common
, skc_daddr
));
10438 case offsetof(struct bpf_sock_ops
, local_ip4
):
10439 BUILD_BUG_ON(sizeof_field(struct sock_common
,
10440 skc_rcv_saddr
) != 4);
10442 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10443 struct bpf_sock_ops_kern
, sk
),
10444 si
->dst_reg
, si
->src_reg
,
10445 offsetof(struct bpf_sock_ops_kern
, sk
));
10446 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
10447 offsetof(struct sock_common
,
10451 case offsetof(struct bpf_sock_ops
, remote_ip6
[0]) ...
10452 offsetof(struct bpf_sock_ops
, remote_ip6
[3]):
10453 #if IS_ENABLED(CONFIG_IPV6)
10454 BUILD_BUG_ON(sizeof_field(struct sock_common
,
10455 skc_v6_daddr
.s6_addr32
[0]) != 4);
10458 off
-= offsetof(struct bpf_sock_ops
, remote_ip6
[0]);
10459 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10460 struct bpf_sock_ops_kern
, sk
),
10461 si
->dst_reg
, si
->src_reg
,
10462 offsetof(struct bpf_sock_ops_kern
, sk
));
10463 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
10464 offsetof(struct sock_common
,
10465 skc_v6_daddr
.s6_addr32
[0]) +
10468 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
10472 case offsetof(struct bpf_sock_ops
, local_ip6
[0]) ...
10473 offsetof(struct bpf_sock_ops
, local_ip6
[3]):
10474 #if IS_ENABLED(CONFIG_IPV6)
10475 BUILD_BUG_ON(sizeof_field(struct sock_common
,
10476 skc_v6_rcv_saddr
.s6_addr32
[0]) != 4);
10479 off
-= offsetof(struct bpf_sock_ops
, local_ip6
[0]);
10480 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10481 struct bpf_sock_ops_kern
, sk
),
10482 si
->dst_reg
, si
->src_reg
,
10483 offsetof(struct bpf_sock_ops_kern
, sk
));
10484 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
10485 offsetof(struct sock_common
,
10486 skc_v6_rcv_saddr
.s6_addr32
[0]) +
10489 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
10493 case offsetof(struct bpf_sock_ops
, remote_port
):
10494 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_dport
) != 2);
10496 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10497 struct bpf_sock_ops_kern
, sk
),
10498 si
->dst_reg
, si
->src_reg
,
10499 offsetof(struct bpf_sock_ops_kern
, sk
));
10500 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
10501 offsetof(struct sock_common
, skc_dport
));
10502 #ifndef __BIG_ENDIAN_BITFIELD
10503 *insn
++ = BPF_ALU32_IMM(BPF_LSH
, si
->dst_reg
, 16);
10507 case offsetof(struct bpf_sock_ops
, local_port
):
10508 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_num
) != 2);
10510 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10511 struct bpf_sock_ops_kern
, sk
),
10512 si
->dst_reg
, si
->src_reg
,
10513 offsetof(struct bpf_sock_ops_kern
, sk
));
10514 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
10515 offsetof(struct sock_common
, skc_num
));
10518 case offsetof(struct bpf_sock_ops
, is_fullsock
):
10519 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10520 struct bpf_sock_ops_kern
,
10522 si
->dst_reg
, si
->src_reg
,
10523 offsetof(struct bpf_sock_ops_kern
,
10527 case offsetof(struct bpf_sock_ops
, state
):
10528 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_state
) != 1);
10530 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10531 struct bpf_sock_ops_kern
, sk
),
10532 si
->dst_reg
, si
->src_reg
,
10533 offsetof(struct bpf_sock_ops_kern
, sk
));
10534 *insn
++ = BPF_LDX_MEM(BPF_B
, si
->dst_reg
, si
->dst_reg
,
10535 offsetof(struct sock_common
, skc_state
));
10538 case offsetof(struct bpf_sock_ops
, rtt_min
):
10539 BUILD_BUG_ON(sizeof_field(struct tcp_sock
, rtt_min
) !=
10540 sizeof(struct minmax
));
10541 BUILD_BUG_ON(sizeof(struct minmax
) <
10542 sizeof(struct minmax_sample
));
10544 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10545 struct bpf_sock_ops_kern
, sk
),
10546 si
->dst_reg
, si
->src_reg
,
10547 offsetof(struct bpf_sock_ops_kern
, sk
));
10548 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
10549 offsetof(struct tcp_sock
, rtt_min
) +
10550 sizeof_field(struct minmax_sample
, t
));
10553 case offsetof(struct bpf_sock_ops
, bpf_sock_ops_cb_flags
):
10554 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags
, bpf_sock_ops_cb_flags
,
10558 case offsetof(struct bpf_sock_ops
, sk_txhash
):
10559 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash
, sk_txhash
,
10560 struct sock
, type
);
10562 case offsetof(struct bpf_sock_ops
, snd_cwnd
):
10563 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd
);
10565 case offsetof(struct bpf_sock_ops
, srtt_us
):
10566 SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us
);
10568 case offsetof(struct bpf_sock_ops
, snd_ssthresh
):
10569 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh
);
10571 case offsetof(struct bpf_sock_ops
, rcv_nxt
):
10572 SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt
);
10574 case offsetof(struct bpf_sock_ops
, snd_nxt
):
10575 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt
);
10577 case offsetof(struct bpf_sock_ops
, snd_una
):
10578 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una
);
10580 case offsetof(struct bpf_sock_ops
, mss_cache
):
10581 SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache
);
10583 case offsetof(struct bpf_sock_ops
, ecn_flags
):
10584 SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags
);
10586 case offsetof(struct bpf_sock_ops
, rate_delivered
):
10587 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered
);
10589 case offsetof(struct bpf_sock_ops
, rate_interval_us
):
10590 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us
);
10592 case offsetof(struct bpf_sock_ops
, packets_out
):
10593 SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out
);
10595 case offsetof(struct bpf_sock_ops
, retrans_out
):
10596 SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out
);
10598 case offsetof(struct bpf_sock_ops
, total_retrans
):
10599 SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans
);
10601 case offsetof(struct bpf_sock_ops
, segs_in
):
10602 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in
);
10604 case offsetof(struct bpf_sock_ops
, data_segs_in
):
10605 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in
);
10607 case offsetof(struct bpf_sock_ops
, segs_out
):
10608 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out
);
10610 case offsetof(struct bpf_sock_ops
, data_segs_out
):
10611 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out
);
10613 case offsetof(struct bpf_sock_ops
, lost_out
):
10614 SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out
);
10616 case offsetof(struct bpf_sock_ops
, sacked_out
):
10617 SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out
);
10619 case offsetof(struct bpf_sock_ops
, bytes_received
):
10620 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received
);
10622 case offsetof(struct bpf_sock_ops
, bytes_acked
):
10623 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked
);
10625 case offsetof(struct bpf_sock_ops
, sk
):
10628 case offsetof(struct bpf_sock_ops
, skb_data_end
):
10629 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern
,
10631 si
->dst_reg
, si
->src_reg
,
10632 offsetof(struct bpf_sock_ops_kern
,
10635 case offsetof(struct bpf_sock_ops
, skb_data
):
10636 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern
,
10638 si
->dst_reg
, si
->src_reg
,
10639 offsetof(struct bpf_sock_ops_kern
,
10641 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, si
->dst_reg
, 0, 1);
10642 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, data
),
10643 si
->dst_reg
, si
->dst_reg
,
10644 offsetof(struct sk_buff
, data
));
10646 case offsetof(struct bpf_sock_ops
, skb_len
):
10647 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern
,
10649 si
->dst_reg
, si
->src_reg
,
10650 offsetof(struct bpf_sock_ops_kern
,
10652 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, si
->dst_reg
, 0, 1);
10653 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, len
),
10654 si
->dst_reg
, si
->dst_reg
,
10655 offsetof(struct sk_buff
, len
));
10657 case offsetof(struct bpf_sock_ops
, skb_tcp_flags
):
10658 off
= offsetof(struct sk_buff
, cb
);
10659 off
+= offsetof(struct tcp_skb_cb
, tcp_flags
);
10660 *target_size
= sizeof_field(struct tcp_skb_cb
, tcp_flags
);
10661 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern
,
10663 si
->dst_reg
, si
->src_reg
,
10664 offsetof(struct bpf_sock_ops_kern
,
10666 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, si
->dst_reg
, 0, 1);
10667 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_skb_cb
,
10669 si
->dst_reg
, si
->dst_reg
, off
);
10671 case offsetof(struct bpf_sock_ops
, skb_hwtstamp
): {
10672 struct bpf_insn
*jmp_on_null_skb
;
10674 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern
,
10676 si
->dst_reg
, si
->src_reg
,
10677 offsetof(struct bpf_sock_ops_kern
,
10679 /* Reserve one insn to test skb == NULL */
10680 jmp_on_null_skb
= insn
++;
10681 insn
= bpf_convert_shinfo_access(si
->dst_reg
, si
->dst_reg
, insn
);
10682 *insn
++ = BPF_LDX_MEM(BPF_DW
, si
->dst_reg
, si
->dst_reg
,
10683 bpf_target_off(struct skb_shared_info
,
10686 *jmp_on_null_skb
= BPF_JMP_IMM(BPF_JEQ
, si
->dst_reg
, 0,
10687 insn
- jmp_on_null_skb
- 1);
10691 return insn
- insn_buf
;
10694 /* data_end = skb->data + skb_headlen() */
10695 static struct bpf_insn
*bpf_convert_data_end_access(const struct bpf_insn
*si
,
10696 struct bpf_insn
*insn
)
10699 int temp_reg_off
= offsetof(struct sk_buff
, cb
) +
10700 offsetof(struct sk_skb_cb
, temp_reg
);
10702 if (si
->src_reg
== si
->dst_reg
) {
10703 /* We need an extra register, choose and save a register. */
10705 if (si
->src_reg
== reg
|| si
->dst_reg
== reg
)
10707 if (si
->src_reg
== reg
|| si
->dst_reg
== reg
)
10709 *insn
++ = BPF_STX_MEM(BPF_DW
, si
->src_reg
, reg
, temp_reg_off
);
10714 /* reg = skb->data */
10715 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, data
),
10717 offsetof(struct sk_buff
, data
));
10718 /* AX = skb->len */
10719 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, len
),
10720 BPF_REG_AX
, si
->src_reg
,
10721 offsetof(struct sk_buff
, len
));
10722 /* reg = skb->data + skb->len */
10723 *insn
++ = BPF_ALU64_REG(BPF_ADD
, reg
, BPF_REG_AX
);
10724 /* AX = skb->data_len */
10725 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff
, data_len
),
10726 BPF_REG_AX
, si
->src_reg
,
10727 offsetof(struct sk_buff
, data_len
));
10729 /* reg = skb->data + skb->len - skb->data_len */
10730 *insn
++ = BPF_ALU64_REG(BPF_SUB
, reg
, BPF_REG_AX
);
10732 if (si
->src_reg
== si
->dst_reg
) {
10733 /* Restore the saved register */
10734 *insn
++ = BPF_MOV64_REG(BPF_REG_AX
, si
->src_reg
);
10735 *insn
++ = BPF_MOV64_REG(si
->dst_reg
, reg
);
10736 *insn
++ = BPF_LDX_MEM(BPF_DW
, reg
, BPF_REG_AX
, temp_reg_off
);
10742 static u32
sk_skb_convert_ctx_access(enum bpf_access_type type
,
10743 const struct bpf_insn
*si
,
10744 struct bpf_insn
*insn_buf
,
10745 struct bpf_prog
*prog
, u32
*target_size
)
10747 struct bpf_insn
*insn
= insn_buf
;
10751 case offsetof(struct __sk_buff
, data_end
):
10752 insn
= bpf_convert_data_end_access(si
, insn
);
10754 case offsetof(struct __sk_buff
, cb
[0]) ...
10755 offsetofend(struct __sk_buff
, cb
[4]) - 1:
10756 BUILD_BUG_ON(sizeof_field(struct sk_skb_cb
, data
) < 20);
10757 BUILD_BUG_ON((offsetof(struct sk_buff
, cb
) +
10758 offsetof(struct sk_skb_cb
, data
)) %
10761 prog
->cb_access
= 1;
10763 off
-= offsetof(struct __sk_buff
, cb
[0]);
10764 off
+= offsetof(struct sk_buff
, cb
);
10765 off
+= offsetof(struct sk_skb_cb
, data
);
10766 if (type
== BPF_WRITE
)
10767 *insn
++ = BPF_EMIT_STORE(BPF_SIZE(si
->code
), si
, off
);
10769 *insn
++ = BPF_LDX_MEM(BPF_SIZE(si
->code
), si
->dst_reg
,
10775 return bpf_convert_ctx_access(type
, si
, insn_buf
, prog
,
10779 return insn
- insn_buf
;
10782 static u32
sk_msg_convert_ctx_access(enum bpf_access_type type
,
10783 const struct bpf_insn
*si
,
10784 struct bpf_insn
*insn_buf
,
10785 struct bpf_prog
*prog
, u32
*target_size
)
10787 struct bpf_insn
*insn
= insn_buf
;
10788 #if IS_ENABLED(CONFIG_IPV6)
10792 /* convert ctx uses the fact sg element is first in struct */
10793 BUILD_BUG_ON(offsetof(struct sk_msg
, sg
) != 0);
10796 case offsetof(struct sk_msg_md
, data
):
10797 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg
, data
),
10798 si
->dst_reg
, si
->src_reg
,
10799 offsetof(struct sk_msg
, data
));
10801 case offsetof(struct sk_msg_md
, data_end
):
10802 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg
, data_end
),
10803 si
->dst_reg
, si
->src_reg
,
10804 offsetof(struct sk_msg
, data_end
));
10806 case offsetof(struct sk_msg_md
, family
):
10807 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_family
) != 2);
10809 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10810 struct sk_msg
, sk
),
10811 si
->dst_reg
, si
->src_reg
,
10812 offsetof(struct sk_msg
, sk
));
10813 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
10814 offsetof(struct sock_common
, skc_family
));
10817 case offsetof(struct sk_msg_md
, remote_ip4
):
10818 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_daddr
) != 4);
10820 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10821 struct sk_msg
, sk
),
10822 si
->dst_reg
, si
->src_reg
,
10823 offsetof(struct sk_msg
, sk
));
10824 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
10825 offsetof(struct sock_common
, skc_daddr
));
10828 case offsetof(struct sk_msg_md
, local_ip4
):
10829 BUILD_BUG_ON(sizeof_field(struct sock_common
,
10830 skc_rcv_saddr
) != 4);
10832 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10833 struct sk_msg
, sk
),
10834 si
->dst_reg
, si
->src_reg
,
10835 offsetof(struct sk_msg
, sk
));
10836 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
10837 offsetof(struct sock_common
,
10841 case offsetof(struct sk_msg_md
, remote_ip6
[0]) ...
10842 offsetof(struct sk_msg_md
, remote_ip6
[3]):
10843 #if IS_ENABLED(CONFIG_IPV6)
10844 BUILD_BUG_ON(sizeof_field(struct sock_common
,
10845 skc_v6_daddr
.s6_addr32
[0]) != 4);
10848 off
-= offsetof(struct sk_msg_md
, remote_ip6
[0]);
10849 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10850 struct sk_msg
, sk
),
10851 si
->dst_reg
, si
->src_reg
,
10852 offsetof(struct sk_msg
, sk
));
10853 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
10854 offsetof(struct sock_common
,
10855 skc_v6_daddr
.s6_addr32
[0]) +
10858 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
10862 case offsetof(struct sk_msg_md
, local_ip6
[0]) ...
10863 offsetof(struct sk_msg_md
, local_ip6
[3]):
10864 #if IS_ENABLED(CONFIG_IPV6)
10865 BUILD_BUG_ON(sizeof_field(struct sock_common
,
10866 skc_v6_rcv_saddr
.s6_addr32
[0]) != 4);
10869 off
-= offsetof(struct sk_msg_md
, local_ip6
[0]);
10870 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10871 struct sk_msg
, sk
),
10872 si
->dst_reg
, si
->src_reg
,
10873 offsetof(struct sk_msg
, sk
));
10874 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
,
10875 offsetof(struct sock_common
,
10876 skc_v6_rcv_saddr
.s6_addr32
[0]) +
10879 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
10883 case offsetof(struct sk_msg_md
, remote_port
):
10884 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_dport
) != 2);
10886 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10887 struct sk_msg
, sk
),
10888 si
->dst_reg
, si
->src_reg
,
10889 offsetof(struct sk_msg
, sk
));
10890 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
10891 offsetof(struct sock_common
, skc_dport
));
10892 #ifndef __BIG_ENDIAN_BITFIELD
10893 *insn
++ = BPF_ALU32_IMM(BPF_LSH
, si
->dst_reg
, 16);
10897 case offsetof(struct sk_msg_md
, local_port
):
10898 BUILD_BUG_ON(sizeof_field(struct sock_common
, skc_num
) != 2);
10900 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10901 struct sk_msg
, sk
),
10902 si
->dst_reg
, si
->src_reg
,
10903 offsetof(struct sk_msg
, sk
));
10904 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->dst_reg
,
10905 offsetof(struct sock_common
, skc_num
));
10908 case offsetof(struct sk_msg_md
, size
):
10909 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg
, size
),
10910 si
->dst_reg
, si
->src_reg
,
10911 offsetof(struct sk_msg_sg
, size
));
10914 case offsetof(struct sk_msg_md
, sk
):
10915 *insn
++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg
, sk
),
10916 si
->dst_reg
, si
->src_reg
,
10917 offsetof(struct sk_msg
, sk
));
10921 return insn
- insn_buf
;
10924 const struct bpf_verifier_ops sk_filter_verifier_ops
= {
10925 .get_func_proto
= sk_filter_func_proto
,
10926 .is_valid_access
= sk_filter_is_valid_access
,
10927 .convert_ctx_access
= bpf_convert_ctx_access
,
10928 .gen_ld_abs
= bpf_gen_ld_abs
,
10931 const struct bpf_prog_ops sk_filter_prog_ops
= {
10932 .test_run
= bpf_prog_test_run_skb
,
10935 const struct bpf_verifier_ops tc_cls_act_verifier_ops
= {
10936 .get_func_proto
= tc_cls_act_func_proto
,
10937 .is_valid_access
= tc_cls_act_is_valid_access
,
10938 .convert_ctx_access
= tc_cls_act_convert_ctx_access
,
10939 .gen_prologue
= tc_cls_act_prologue
,
10940 .gen_ld_abs
= bpf_gen_ld_abs
,
10941 .btf_struct_access
= tc_cls_act_btf_struct_access
,
10944 const struct bpf_prog_ops tc_cls_act_prog_ops
= {
10945 .test_run
= bpf_prog_test_run_skb
,
10948 const struct bpf_verifier_ops xdp_verifier_ops
= {
10949 .get_func_proto
= xdp_func_proto
,
10950 .is_valid_access
= xdp_is_valid_access
,
10951 .convert_ctx_access
= xdp_convert_ctx_access
,
10952 .gen_prologue
= bpf_noop_prologue
,
10953 .btf_struct_access
= xdp_btf_struct_access
,
10956 const struct bpf_prog_ops xdp_prog_ops
= {
10957 .test_run
= bpf_prog_test_run_xdp
,
10960 const struct bpf_verifier_ops cg_skb_verifier_ops
= {
10961 .get_func_proto
= cg_skb_func_proto
,
10962 .is_valid_access
= cg_skb_is_valid_access
,
10963 .convert_ctx_access
= bpf_convert_ctx_access
,
10966 const struct bpf_prog_ops cg_skb_prog_ops
= {
10967 .test_run
= bpf_prog_test_run_skb
,
10970 const struct bpf_verifier_ops lwt_in_verifier_ops
= {
10971 .get_func_proto
= lwt_in_func_proto
,
10972 .is_valid_access
= lwt_is_valid_access
,
10973 .convert_ctx_access
= bpf_convert_ctx_access
,
10976 const struct bpf_prog_ops lwt_in_prog_ops
= {
10977 .test_run
= bpf_prog_test_run_skb
,
10980 const struct bpf_verifier_ops lwt_out_verifier_ops
= {
10981 .get_func_proto
= lwt_out_func_proto
,
10982 .is_valid_access
= lwt_is_valid_access
,
10983 .convert_ctx_access
= bpf_convert_ctx_access
,
10986 const struct bpf_prog_ops lwt_out_prog_ops
= {
10987 .test_run
= bpf_prog_test_run_skb
,
10990 const struct bpf_verifier_ops lwt_xmit_verifier_ops
= {
10991 .get_func_proto
= lwt_xmit_func_proto
,
10992 .is_valid_access
= lwt_is_valid_access
,
10993 .convert_ctx_access
= bpf_convert_ctx_access
,
10994 .gen_prologue
= tc_cls_act_prologue
,
10997 const struct bpf_prog_ops lwt_xmit_prog_ops
= {
10998 .test_run
= bpf_prog_test_run_skb
,
11001 const struct bpf_verifier_ops lwt_seg6local_verifier_ops
= {
11002 .get_func_proto
= lwt_seg6local_func_proto
,
11003 .is_valid_access
= lwt_is_valid_access
,
11004 .convert_ctx_access
= bpf_convert_ctx_access
,
11007 const struct bpf_prog_ops lwt_seg6local_prog_ops
= {
11008 .test_run
= bpf_prog_test_run_skb
,
11011 const struct bpf_verifier_ops cg_sock_verifier_ops
= {
11012 .get_func_proto
= sock_filter_func_proto
,
11013 .is_valid_access
= sock_filter_is_valid_access
,
11014 .convert_ctx_access
= bpf_sock_convert_ctx_access
,
11017 const struct bpf_prog_ops cg_sock_prog_ops
= {
11020 const struct bpf_verifier_ops cg_sock_addr_verifier_ops
= {
11021 .get_func_proto
= sock_addr_func_proto
,
11022 .is_valid_access
= sock_addr_is_valid_access
,
11023 .convert_ctx_access
= sock_addr_convert_ctx_access
,
11026 const struct bpf_prog_ops cg_sock_addr_prog_ops
= {
11029 const struct bpf_verifier_ops sock_ops_verifier_ops
= {
11030 .get_func_proto
= sock_ops_func_proto
,
11031 .is_valid_access
= sock_ops_is_valid_access
,
11032 .convert_ctx_access
= sock_ops_convert_ctx_access
,
11035 const struct bpf_prog_ops sock_ops_prog_ops
= {
11038 const struct bpf_verifier_ops sk_skb_verifier_ops
= {
11039 .get_func_proto
= sk_skb_func_proto
,
11040 .is_valid_access
= sk_skb_is_valid_access
,
11041 .convert_ctx_access
= sk_skb_convert_ctx_access
,
11042 .gen_prologue
= sk_skb_prologue
,
11045 const struct bpf_prog_ops sk_skb_prog_ops
= {
11048 const struct bpf_verifier_ops sk_msg_verifier_ops
= {
11049 .get_func_proto
= sk_msg_func_proto
,
11050 .is_valid_access
= sk_msg_is_valid_access
,
11051 .convert_ctx_access
= sk_msg_convert_ctx_access
,
11052 .gen_prologue
= bpf_noop_prologue
,
11055 const struct bpf_prog_ops sk_msg_prog_ops
= {
11058 const struct bpf_verifier_ops flow_dissector_verifier_ops
= {
11059 .get_func_proto
= flow_dissector_func_proto
,
11060 .is_valid_access
= flow_dissector_is_valid_access
,
11061 .convert_ctx_access
= flow_dissector_convert_ctx_access
,
11064 const struct bpf_prog_ops flow_dissector_prog_ops
= {
11065 .test_run
= bpf_prog_test_run_flow_dissector
,
11068 int sk_detach_filter(struct sock
*sk
)
11071 struct sk_filter
*filter
;
11073 if (sock_flag(sk
, SOCK_FILTER_LOCKED
))
11076 filter
= rcu_dereference_protected(sk
->sk_filter
,
11077 lockdep_sock_is_held(sk
));
11079 RCU_INIT_POINTER(sk
->sk_filter
, NULL
);
11080 sk_filter_uncharge(sk
, filter
);
11086 EXPORT_SYMBOL_GPL(sk_detach_filter
);
11088 int sk_get_filter(struct sock
*sk
, sockptr_t optval
, unsigned int len
)
11090 struct sock_fprog_kern
*fprog
;
11091 struct sk_filter
*filter
;
11094 sockopt_lock_sock(sk
);
11095 filter
= rcu_dereference_protected(sk
->sk_filter
,
11096 lockdep_sock_is_held(sk
));
11100 /* We're copying the filter that has been originally attached,
11101 * so no conversion/decode needed anymore. eBPF programs that
11102 * have no original program cannot be dumped through this.
11105 fprog
= filter
->prog
->orig_prog
;
11111 /* User space only enquires number of filter blocks. */
11115 if (len
< fprog
->len
)
11119 if (copy_to_sockptr(optval
, fprog
->filter
, bpf_classic_proglen(fprog
)))
11122 /* Instead of bytes, the API requests to return the number
11123 * of filter blocks.
11127 sockopt_release_sock(sk
);
11132 static void bpf_init_reuseport_kern(struct sk_reuseport_kern
*reuse_kern
,
11133 struct sock_reuseport
*reuse
,
11134 struct sock
*sk
, struct sk_buff
*skb
,
11135 struct sock
*migrating_sk
,
11138 reuse_kern
->skb
= skb
;
11139 reuse_kern
->sk
= sk
;
11140 reuse_kern
->selected_sk
= NULL
;
11141 reuse_kern
->migrating_sk
= migrating_sk
;
11142 reuse_kern
->data_end
= skb
->data
+ skb_headlen(skb
);
11143 reuse_kern
->hash
= hash
;
11144 reuse_kern
->reuseport_id
= reuse
->reuseport_id
;
11145 reuse_kern
->bind_inany
= reuse
->bind_inany
;
11148 struct sock
*bpf_run_sk_reuseport(struct sock_reuseport
*reuse
, struct sock
*sk
,
11149 struct bpf_prog
*prog
, struct sk_buff
*skb
,
11150 struct sock
*migrating_sk
,
11153 struct sk_reuseport_kern reuse_kern
;
11154 enum sk_action action
;
11156 bpf_init_reuseport_kern(&reuse_kern
, reuse
, sk
, skb
, migrating_sk
, hash
);
11157 action
= bpf_prog_run(prog
, &reuse_kern
);
11159 if (action
== SK_PASS
)
11160 return reuse_kern
.selected_sk
;
11162 return ERR_PTR(-ECONNREFUSED
);
11165 BPF_CALL_4(sk_select_reuseport
, struct sk_reuseport_kern
*, reuse_kern
,
11166 struct bpf_map
*, map
, void *, key
, u32
, flags
)
11168 bool is_sockarray
= map
->map_type
== BPF_MAP_TYPE_REUSEPORT_SOCKARRAY
;
11169 struct sock_reuseport
*reuse
;
11170 struct sock
*selected_sk
;
11172 selected_sk
= map
->ops
->map_lookup_elem(map
, key
);
11176 reuse
= rcu_dereference(selected_sk
->sk_reuseport_cb
);
11178 /* Lookup in sock_map can return TCP ESTABLISHED sockets. */
11179 if (sk_is_refcounted(selected_sk
))
11180 sock_put(selected_sk
);
11182 /* reuseport_array has only sk with non NULL sk_reuseport_cb.
11183 * The only (!reuse) case here is - the sk has already been
11184 * unhashed (e.g. by close()), so treat it as -ENOENT.
11186 * Other maps (e.g. sock_map) do not provide this guarantee and
11187 * the sk may never be in the reuseport group to begin with.
11189 return is_sockarray
? -ENOENT
: -EINVAL
;
11192 if (unlikely(reuse
->reuseport_id
!= reuse_kern
->reuseport_id
)) {
11193 struct sock
*sk
= reuse_kern
->sk
;
11195 if (sk
->sk_protocol
!= selected_sk
->sk_protocol
)
11196 return -EPROTOTYPE
;
11197 else if (sk
->sk_family
!= selected_sk
->sk_family
)
11198 return -EAFNOSUPPORT
;
11200 /* Catch all. Likely bound to a different sockaddr. */
11204 reuse_kern
->selected_sk
= selected_sk
;
11209 static const struct bpf_func_proto sk_select_reuseport_proto
= {
11210 .func
= sk_select_reuseport
,
11212 .ret_type
= RET_INTEGER
,
11213 .arg1_type
= ARG_PTR_TO_CTX
,
11214 .arg2_type
= ARG_CONST_MAP_PTR
,
11215 .arg3_type
= ARG_PTR_TO_MAP_KEY
,
11216 .arg4_type
= ARG_ANYTHING
,
11219 BPF_CALL_4(sk_reuseport_load_bytes
,
11220 const struct sk_reuseport_kern
*, reuse_kern
, u32
, offset
,
11221 void *, to
, u32
, len
)
11223 return ____bpf_skb_load_bytes(reuse_kern
->skb
, offset
, to
, len
);
11226 static const struct bpf_func_proto sk_reuseport_load_bytes_proto
= {
11227 .func
= sk_reuseport_load_bytes
,
11229 .ret_type
= RET_INTEGER
,
11230 .arg1_type
= ARG_PTR_TO_CTX
,
11231 .arg2_type
= ARG_ANYTHING
,
11232 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
11233 .arg4_type
= ARG_CONST_SIZE
,
11236 BPF_CALL_5(sk_reuseport_load_bytes_relative
,
11237 const struct sk_reuseport_kern
*, reuse_kern
, u32
, offset
,
11238 void *, to
, u32
, len
, u32
, start_header
)
11240 return ____bpf_skb_load_bytes_relative(reuse_kern
->skb
, offset
, to
,
11241 len
, start_header
);
11244 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto
= {
11245 .func
= sk_reuseport_load_bytes_relative
,
11247 .ret_type
= RET_INTEGER
,
11248 .arg1_type
= ARG_PTR_TO_CTX
,
11249 .arg2_type
= ARG_ANYTHING
,
11250 .arg3_type
= ARG_PTR_TO_UNINIT_MEM
,
11251 .arg4_type
= ARG_CONST_SIZE
,
11252 .arg5_type
= ARG_ANYTHING
,
11255 static const struct bpf_func_proto
*
11256 sk_reuseport_func_proto(enum bpf_func_id func_id
,
11257 const struct bpf_prog
*prog
)
11260 case BPF_FUNC_sk_select_reuseport
:
11261 return &sk_select_reuseport_proto
;
11262 case BPF_FUNC_skb_load_bytes
:
11263 return &sk_reuseport_load_bytes_proto
;
11264 case BPF_FUNC_skb_load_bytes_relative
:
11265 return &sk_reuseport_load_bytes_relative_proto
;
11266 case BPF_FUNC_get_socket_cookie
:
11267 return &bpf_get_socket_ptr_cookie_proto
;
11268 case BPF_FUNC_ktime_get_coarse_ns
:
11269 return &bpf_ktime_get_coarse_ns_proto
;
11271 return bpf_base_func_proto(func_id
, prog
);
11276 sk_reuseport_is_valid_access(int off
, int size
,
11277 enum bpf_access_type type
,
11278 const struct bpf_prog
*prog
,
11279 struct bpf_insn_access_aux
*info
)
11281 const u32 size_default
= sizeof(__u32
);
11283 if (off
< 0 || off
>= sizeof(struct sk_reuseport_md
) ||
11284 off
% size
|| type
!= BPF_READ
)
11288 case offsetof(struct sk_reuseport_md
, data
):
11289 info
->reg_type
= PTR_TO_PACKET
;
11290 return size
== sizeof(__u64
);
11292 case offsetof(struct sk_reuseport_md
, data_end
):
11293 info
->reg_type
= PTR_TO_PACKET_END
;
11294 return size
== sizeof(__u64
);
11296 case offsetof(struct sk_reuseport_md
, hash
):
11297 return size
== size_default
;
11299 case offsetof(struct sk_reuseport_md
, sk
):
11300 info
->reg_type
= PTR_TO_SOCKET
;
11301 return size
== sizeof(__u64
);
11303 case offsetof(struct sk_reuseport_md
, migrating_sk
):
11304 info
->reg_type
= PTR_TO_SOCK_COMMON_OR_NULL
;
11305 return size
== sizeof(__u64
);
11307 /* Fields that allow narrowing */
11308 case bpf_ctx_range(struct sk_reuseport_md
, eth_protocol
):
11309 if (size
< sizeof_field(struct sk_buff
, protocol
))
11312 case bpf_ctx_range(struct sk_reuseport_md
, ip_protocol
):
11313 case bpf_ctx_range(struct sk_reuseport_md
, bind_inany
):
11314 case bpf_ctx_range(struct sk_reuseport_md
, len
):
11315 bpf_ctx_record_field_size(info
, size_default
);
11316 return bpf_ctx_narrow_access_ok(off
, size
, size_default
);
11323 #define SK_REUSEPORT_LOAD_FIELD(F) ({ \
11324 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \
11325 si->dst_reg, si->src_reg, \
11326 bpf_target_off(struct sk_reuseport_kern, F, \
11327 sizeof_field(struct sk_reuseport_kern, F), \
11331 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \
11332 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \
11337 #define SK_REUSEPORT_LOAD_SK_FIELD(SK_FIELD) \
11338 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \
11343 static u32
sk_reuseport_convert_ctx_access(enum bpf_access_type type
,
11344 const struct bpf_insn
*si
,
11345 struct bpf_insn
*insn_buf
,
11346 struct bpf_prog
*prog
,
11349 struct bpf_insn
*insn
= insn_buf
;
11352 case offsetof(struct sk_reuseport_md
, data
):
11353 SK_REUSEPORT_LOAD_SKB_FIELD(data
);
11356 case offsetof(struct sk_reuseport_md
, len
):
11357 SK_REUSEPORT_LOAD_SKB_FIELD(len
);
11360 case offsetof(struct sk_reuseport_md
, eth_protocol
):
11361 SK_REUSEPORT_LOAD_SKB_FIELD(protocol
);
11364 case offsetof(struct sk_reuseport_md
, ip_protocol
):
11365 SK_REUSEPORT_LOAD_SK_FIELD(sk_protocol
);
11368 case offsetof(struct sk_reuseport_md
, data_end
):
11369 SK_REUSEPORT_LOAD_FIELD(data_end
);
11372 case offsetof(struct sk_reuseport_md
, hash
):
11373 SK_REUSEPORT_LOAD_FIELD(hash
);
11376 case offsetof(struct sk_reuseport_md
, bind_inany
):
11377 SK_REUSEPORT_LOAD_FIELD(bind_inany
);
11380 case offsetof(struct sk_reuseport_md
, sk
):
11381 SK_REUSEPORT_LOAD_FIELD(sk
);
11384 case offsetof(struct sk_reuseport_md
, migrating_sk
):
11385 SK_REUSEPORT_LOAD_FIELD(migrating_sk
);
11389 return insn
- insn_buf
;
11392 const struct bpf_verifier_ops sk_reuseport_verifier_ops
= {
11393 .get_func_proto
= sk_reuseport_func_proto
,
11394 .is_valid_access
= sk_reuseport_is_valid_access
,
11395 .convert_ctx_access
= sk_reuseport_convert_ctx_access
,
11398 const struct bpf_prog_ops sk_reuseport_prog_ops
= {
11401 DEFINE_STATIC_KEY_FALSE(bpf_sk_lookup_enabled
);
11402 EXPORT_SYMBOL(bpf_sk_lookup_enabled
);
11404 BPF_CALL_3(bpf_sk_lookup_assign
, struct bpf_sk_lookup_kern
*, ctx
,
11405 struct sock
*, sk
, u64
, flags
)
11407 if (unlikely(flags
& ~(BPF_SK_LOOKUP_F_REPLACE
|
11408 BPF_SK_LOOKUP_F_NO_REUSEPORT
)))
11410 if (unlikely(sk
&& sk_is_refcounted(sk
)))
11411 return -ESOCKTNOSUPPORT
; /* reject non-RCU freed sockets */
11412 if (unlikely(sk
&& sk_is_tcp(sk
) && sk
->sk_state
!= TCP_LISTEN
))
11413 return -ESOCKTNOSUPPORT
; /* only accept TCP socket in LISTEN */
11414 if (unlikely(sk
&& sk_is_udp(sk
) && sk
->sk_state
!= TCP_CLOSE
))
11415 return -ESOCKTNOSUPPORT
; /* only accept UDP socket in CLOSE */
11417 /* Check if socket is suitable for packet L3/L4 protocol */
11418 if (sk
&& sk
->sk_protocol
!= ctx
->protocol
)
11419 return -EPROTOTYPE
;
11420 if (sk
&& sk
->sk_family
!= ctx
->family
&&
11421 (sk
->sk_family
== AF_INET
|| ipv6_only_sock(sk
)))
11422 return -EAFNOSUPPORT
;
11424 if (ctx
->selected_sk
&& !(flags
& BPF_SK_LOOKUP_F_REPLACE
))
11427 /* Select socket as lookup result */
11428 ctx
->selected_sk
= sk
;
11429 ctx
->no_reuseport
= flags
& BPF_SK_LOOKUP_F_NO_REUSEPORT
;
11433 static const struct bpf_func_proto bpf_sk_lookup_assign_proto
= {
11434 .func
= bpf_sk_lookup_assign
,
11436 .ret_type
= RET_INTEGER
,
11437 .arg1_type
= ARG_PTR_TO_CTX
,
11438 .arg2_type
= ARG_PTR_TO_SOCKET_OR_NULL
,
11439 .arg3_type
= ARG_ANYTHING
,
11442 static const struct bpf_func_proto
*
11443 sk_lookup_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
11446 case BPF_FUNC_perf_event_output
:
11447 return &bpf_event_output_data_proto
;
11448 case BPF_FUNC_sk_assign
:
11449 return &bpf_sk_lookup_assign_proto
;
11450 case BPF_FUNC_sk_release
:
11451 return &bpf_sk_release_proto
;
11453 return bpf_sk_base_func_proto(func_id
, prog
);
11457 static bool sk_lookup_is_valid_access(int off
, int size
,
11458 enum bpf_access_type type
,
11459 const struct bpf_prog
*prog
,
11460 struct bpf_insn_access_aux
*info
)
11462 if (off
< 0 || off
>= sizeof(struct bpf_sk_lookup
))
11464 if (off
% size
!= 0)
11466 if (type
!= BPF_READ
)
11470 case offsetof(struct bpf_sk_lookup
, sk
):
11471 info
->reg_type
= PTR_TO_SOCKET_OR_NULL
;
11472 return size
== sizeof(__u64
);
11474 case bpf_ctx_range(struct bpf_sk_lookup
, family
):
11475 case bpf_ctx_range(struct bpf_sk_lookup
, protocol
):
11476 case bpf_ctx_range(struct bpf_sk_lookup
, remote_ip4
):
11477 case bpf_ctx_range(struct bpf_sk_lookup
, local_ip4
):
11478 case bpf_ctx_range_till(struct bpf_sk_lookup
, remote_ip6
[0], remote_ip6
[3]):
11479 case bpf_ctx_range_till(struct bpf_sk_lookup
, local_ip6
[0], local_ip6
[3]):
11480 case bpf_ctx_range(struct bpf_sk_lookup
, local_port
):
11481 case bpf_ctx_range(struct bpf_sk_lookup
, ingress_ifindex
):
11482 bpf_ctx_record_field_size(info
, sizeof(__u32
));
11483 return bpf_ctx_narrow_access_ok(off
, size
, sizeof(__u32
));
11485 case bpf_ctx_range(struct bpf_sk_lookup
, remote_port
):
11486 /* Allow 4-byte access to 2-byte field for backward compatibility */
11487 if (size
== sizeof(__u32
))
11489 bpf_ctx_record_field_size(info
, sizeof(__be16
));
11490 return bpf_ctx_narrow_access_ok(off
, size
, sizeof(__be16
));
11492 case offsetofend(struct bpf_sk_lookup
, remote_port
) ...
11493 offsetof(struct bpf_sk_lookup
, local_ip4
) - 1:
11494 /* Allow access to zero padding for backward compatibility */
11495 bpf_ctx_record_field_size(info
, sizeof(__u16
));
11496 return bpf_ctx_narrow_access_ok(off
, size
, sizeof(__u16
));
11503 static u32
sk_lookup_convert_ctx_access(enum bpf_access_type type
,
11504 const struct bpf_insn
*si
,
11505 struct bpf_insn
*insn_buf
,
11506 struct bpf_prog
*prog
,
11509 struct bpf_insn
*insn
= insn_buf
;
11512 case offsetof(struct bpf_sk_lookup
, sk
):
11513 *insn
++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si
->dst_reg
, si
->src_reg
,
11514 offsetof(struct bpf_sk_lookup_kern
, selected_sk
));
11517 case offsetof(struct bpf_sk_lookup
, family
):
11518 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
11519 bpf_target_off(struct bpf_sk_lookup_kern
,
11520 family
, 2, target_size
));
11523 case offsetof(struct bpf_sk_lookup
, protocol
):
11524 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
11525 bpf_target_off(struct bpf_sk_lookup_kern
,
11526 protocol
, 2, target_size
));
11529 case offsetof(struct bpf_sk_lookup
, remote_ip4
):
11530 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
11531 bpf_target_off(struct bpf_sk_lookup_kern
,
11532 v4
.saddr
, 4, target_size
));
11535 case offsetof(struct bpf_sk_lookup
, local_ip4
):
11536 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
11537 bpf_target_off(struct bpf_sk_lookup_kern
,
11538 v4
.daddr
, 4, target_size
));
11541 case bpf_ctx_range_till(struct bpf_sk_lookup
,
11542 remote_ip6
[0], remote_ip6
[3]): {
11543 #if IS_ENABLED(CONFIG_IPV6)
11546 off
-= offsetof(struct bpf_sk_lookup
, remote_ip6
[0]);
11547 off
+= bpf_target_off(struct in6_addr
, s6_addr32
[0], 4, target_size
);
11548 *insn
++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si
->dst_reg
, si
->src_reg
,
11549 offsetof(struct bpf_sk_lookup_kern
, v6
.saddr
));
11550 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, si
->dst_reg
, 0, 1);
11551 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
, off
);
11553 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
11557 case bpf_ctx_range_till(struct bpf_sk_lookup
,
11558 local_ip6
[0], local_ip6
[3]): {
11559 #if IS_ENABLED(CONFIG_IPV6)
11562 off
-= offsetof(struct bpf_sk_lookup
, local_ip6
[0]);
11563 off
+= bpf_target_off(struct in6_addr
, s6_addr32
[0], 4, target_size
);
11564 *insn
++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si
->dst_reg
, si
->src_reg
,
11565 offsetof(struct bpf_sk_lookup_kern
, v6
.daddr
));
11566 *insn
++ = BPF_JMP_IMM(BPF_JEQ
, si
->dst_reg
, 0, 1);
11567 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->dst_reg
, off
);
11569 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
11573 case offsetof(struct bpf_sk_lookup
, remote_port
):
11574 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
11575 bpf_target_off(struct bpf_sk_lookup_kern
,
11576 sport
, 2, target_size
));
11579 case offsetofend(struct bpf_sk_lookup
, remote_port
):
11581 *insn
++ = BPF_MOV32_IMM(si
->dst_reg
, 0);
11584 case offsetof(struct bpf_sk_lookup
, local_port
):
11585 *insn
++ = BPF_LDX_MEM(BPF_H
, si
->dst_reg
, si
->src_reg
,
11586 bpf_target_off(struct bpf_sk_lookup_kern
,
11587 dport
, 2, target_size
));
11590 case offsetof(struct bpf_sk_lookup
, ingress_ifindex
):
11591 *insn
++ = BPF_LDX_MEM(BPF_W
, si
->dst_reg
, si
->src_reg
,
11592 bpf_target_off(struct bpf_sk_lookup_kern
,
11593 ingress_ifindex
, 4, target_size
));
11597 return insn
- insn_buf
;
11600 const struct bpf_prog_ops sk_lookup_prog_ops
= {
11601 .test_run
= bpf_prog_test_run_sk_lookup
,
11604 const struct bpf_verifier_ops sk_lookup_verifier_ops
= {
11605 .get_func_proto
= sk_lookup_func_proto
,
11606 .is_valid_access
= sk_lookup_is_valid_access
,
11607 .convert_ctx_access
= sk_lookup_convert_ctx_access
,
11610 #endif /* CONFIG_INET */
11612 DEFINE_BPF_DISPATCHER(xdp
)
11614 void bpf_prog_change_xdp(struct bpf_prog
*prev_prog
, struct bpf_prog
*prog
)
11616 bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(xdp
), prev_prog
, prog
);
11619 BTF_ID_LIST_GLOBAL(btf_sock_ids
, MAX_BTF_SOCK_TYPE
)
11620 #define BTF_SOCK_TYPE(name, type) BTF_ID(struct, type)
11622 #undef BTF_SOCK_TYPE
11624 BPF_CALL_1(bpf_skc_to_tcp6_sock
, struct sock
*, sk
)
11626 /* tcp6_sock type is not generated in dwarf and hence btf,
11627 * trigger an explicit type generation here.
11629 BTF_TYPE_EMIT(struct tcp6_sock
);
11630 if (sk
&& sk_fullsock(sk
) && sk
->sk_protocol
== IPPROTO_TCP
&&
11631 sk
->sk_family
== AF_INET6
)
11632 return (unsigned long)sk
;
11634 return (unsigned long)NULL
;
11637 const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto
= {
11638 .func
= bpf_skc_to_tcp6_sock
,
11640 .ret_type
= RET_PTR_TO_BTF_ID_OR_NULL
,
11641 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
11642 .ret_btf_id
= &btf_sock_ids
[BTF_SOCK_TYPE_TCP6
],
11645 BPF_CALL_1(bpf_skc_to_tcp_sock
, struct sock
*, sk
)
11647 if (sk
&& sk_fullsock(sk
) && sk
->sk_protocol
== IPPROTO_TCP
)
11648 return (unsigned long)sk
;
11650 return (unsigned long)NULL
;
11653 const struct bpf_func_proto bpf_skc_to_tcp_sock_proto
= {
11654 .func
= bpf_skc_to_tcp_sock
,
11656 .ret_type
= RET_PTR_TO_BTF_ID_OR_NULL
,
11657 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
11658 .ret_btf_id
= &btf_sock_ids
[BTF_SOCK_TYPE_TCP
],
11661 BPF_CALL_1(bpf_skc_to_tcp_timewait_sock
, struct sock
*, sk
)
11663 /* BTF types for tcp_timewait_sock and inet_timewait_sock are not
11664 * generated if CONFIG_INET=n. Trigger an explicit generation here.
11666 BTF_TYPE_EMIT(struct inet_timewait_sock
);
11667 BTF_TYPE_EMIT(struct tcp_timewait_sock
);
11670 if (sk
&& sk
->sk_prot
== &tcp_prot
&& sk
->sk_state
== TCP_TIME_WAIT
)
11671 return (unsigned long)sk
;
11674 #if IS_BUILTIN(CONFIG_IPV6)
11675 if (sk
&& sk
->sk_prot
== &tcpv6_prot
&& sk
->sk_state
== TCP_TIME_WAIT
)
11676 return (unsigned long)sk
;
11679 return (unsigned long)NULL
;
11682 const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto
= {
11683 .func
= bpf_skc_to_tcp_timewait_sock
,
11685 .ret_type
= RET_PTR_TO_BTF_ID_OR_NULL
,
11686 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
11687 .ret_btf_id
= &btf_sock_ids
[BTF_SOCK_TYPE_TCP_TW
],
11690 BPF_CALL_1(bpf_skc_to_tcp_request_sock
, struct sock
*, sk
)
11693 if (sk
&& sk
->sk_prot
== &tcp_prot
&& sk
->sk_state
== TCP_NEW_SYN_RECV
)
11694 return (unsigned long)sk
;
11697 #if IS_BUILTIN(CONFIG_IPV6)
11698 if (sk
&& sk
->sk_prot
== &tcpv6_prot
&& sk
->sk_state
== TCP_NEW_SYN_RECV
)
11699 return (unsigned long)sk
;
11702 return (unsigned long)NULL
;
11705 const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto
= {
11706 .func
= bpf_skc_to_tcp_request_sock
,
11708 .ret_type
= RET_PTR_TO_BTF_ID_OR_NULL
,
11709 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
11710 .ret_btf_id
= &btf_sock_ids
[BTF_SOCK_TYPE_TCP_REQ
],
11713 BPF_CALL_1(bpf_skc_to_udp6_sock
, struct sock
*, sk
)
11715 /* udp6_sock type is not generated in dwarf and hence btf,
11716 * trigger an explicit type generation here.
11718 BTF_TYPE_EMIT(struct udp6_sock
);
11719 if (sk
&& sk_fullsock(sk
) && sk
->sk_protocol
== IPPROTO_UDP
&&
11720 sk
->sk_type
== SOCK_DGRAM
&& sk
->sk_family
== AF_INET6
)
11721 return (unsigned long)sk
;
11723 return (unsigned long)NULL
;
11726 const struct bpf_func_proto bpf_skc_to_udp6_sock_proto
= {
11727 .func
= bpf_skc_to_udp6_sock
,
11729 .ret_type
= RET_PTR_TO_BTF_ID_OR_NULL
,
11730 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
11731 .ret_btf_id
= &btf_sock_ids
[BTF_SOCK_TYPE_UDP6
],
11734 BPF_CALL_1(bpf_skc_to_unix_sock
, struct sock
*, sk
)
11736 /* unix_sock type is not generated in dwarf and hence btf,
11737 * trigger an explicit type generation here.
11739 BTF_TYPE_EMIT(struct unix_sock
);
11740 if (sk
&& sk_fullsock(sk
) && sk
->sk_family
== AF_UNIX
)
11741 return (unsigned long)sk
;
11743 return (unsigned long)NULL
;
11746 const struct bpf_func_proto bpf_skc_to_unix_sock_proto
= {
11747 .func
= bpf_skc_to_unix_sock
,
11749 .ret_type
= RET_PTR_TO_BTF_ID_OR_NULL
,
11750 .arg1_type
= ARG_PTR_TO_BTF_ID_SOCK_COMMON
,
11751 .ret_btf_id
= &btf_sock_ids
[BTF_SOCK_TYPE_UNIX
],
11754 BPF_CALL_1(bpf_skc_to_mptcp_sock
, struct sock
*, sk
)
11756 BTF_TYPE_EMIT(struct mptcp_sock
);
11757 return (unsigned long)bpf_mptcp_sock_from_subflow(sk
);
11760 const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto
= {
11761 .func
= bpf_skc_to_mptcp_sock
,
11763 .ret_type
= RET_PTR_TO_BTF_ID_OR_NULL
,
11764 .arg1_type
= ARG_PTR_TO_SOCK_COMMON
,
11765 .ret_btf_id
= &btf_sock_ids
[BTF_SOCK_TYPE_MPTCP
],
11768 BPF_CALL_1(bpf_sock_from_file
, struct file
*, file
)
11770 return (unsigned long)sock_from_file(file
);
11773 BTF_ID_LIST(bpf_sock_from_file_btf_ids
)
11774 BTF_ID(struct, socket
)
11775 BTF_ID(struct, file
)
11777 const struct bpf_func_proto bpf_sock_from_file_proto
= {
11778 .func
= bpf_sock_from_file
,
11780 .ret_type
= RET_PTR_TO_BTF_ID_OR_NULL
,
11781 .ret_btf_id
= &bpf_sock_from_file_btf_ids
[0],
11782 .arg1_type
= ARG_PTR_TO_BTF_ID
,
11783 .arg1_btf_id
= &bpf_sock_from_file_btf_ids
[1],
11786 static const struct bpf_func_proto
*
11787 bpf_sk_base_func_proto(enum bpf_func_id func_id
, const struct bpf_prog
*prog
)
11789 const struct bpf_func_proto
*func
;
11792 case BPF_FUNC_skc_to_tcp6_sock
:
11793 func
= &bpf_skc_to_tcp6_sock_proto
;
11795 case BPF_FUNC_skc_to_tcp_sock
:
11796 func
= &bpf_skc_to_tcp_sock_proto
;
11798 case BPF_FUNC_skc_to_tcp_timewait_sock
:
11799 func
= &bpf_skc_to_tcp_timewait_sock_proto
;
11801 case BPF_FUNC_skc_to_tcp_request_sock
:
11802 func
= &bpf_skc_to_tcp_request_sock_proto
;
11804 case BPF_FUNC_skc_to_udp6_sock
:
11805 func
= &bpf_skc_to_udp6_sock_proto
;
11807 case BPF_FUNC_skc_to_unix_sock
:
11808 func
= &bpf_skc_to_unix_sock_proto
;
11810 case BPF_FUNC_skc_to_mptcp_sock
:
11811 func
= &bpf_skc_to_mptcp_sock_proto
;
11813 case BPF_FUNC_ktime_get_coarse_ns
:
11814 return &bpf_ktime_get_coarse_ns_proto
;
11816 return bpf_base_func_proto(func_id
, prog
);
11819 if (!bpf_token_capable(prog
->aux
->token
, CAP_PERFMON
))
11825 __bpf_kfunc_start_defs();
11826 __bpf_kfunc
int bpf_dynptr_from_skb(struct sk_buff
*skb
, u64 flags
,
11827 struct bpf_dynptr_kern
*ptr__uninit
)
11830 bpf_dynptr_set_null(ptr__uninit
);
11834 bpf_dynptr_init(ptr__uninit
, skb
, BPF_DYNPTR_TYPE_SKB
, 0, skb
->len
);
11839 __bpf_kfunc
int bpf_dynptr_from_xdp(struct xdp_buff
*xdp
, u64 flags
,
11840 struct bpf_dynptr_kern
*ptr__uninit
)
11843 bpf_dynptr_set_null(ptr__uninit
);
11847 bpf_dynptr_init(ptr__uninit
, xdp
, BPF_DYNPTR_TYPE_XDP
, 0, xdp_get_buff_len(xdp
));
11852 __bpf_kfunc
int bpf_sock_addr_set_sun_path(struct bpf_sock_addr_kern
*sa_kern
,
11853 const u8
*sun_path
, u32 sun_path__sz
)
11855 struct sockaddr_un
*un
;
11857 if (sa_kern
->sk
->sk_family
!= AF_UNIX
)
11860 /* We do not allow changing the address to unnamed or larger than the
11861 * maximum allowed address size for a unix sockaddr.
11863 if (sun_path__sz
== 0 || sun_path__sz
> UNIX_PATH_MAX
)
11866 un
= (struct sockaddr_un
*)sa_kern
->uaddr
;
11867 memcpy(un
->sun_path
, sun_path
, sun_path__sz
);
11868 sa_kern
->uaddrlen
= offsetof(struct sockaddr_un
, sun_path
) + sun_path__sz
;
11873 __bpf_kfunc
int bpf_sk_assign_tcp_reqsk(struct sk_buff
*skb
, struct sock
*sk
,
11874 struct bpf_tcp_req_attrs
*attrs
, int attrs__sz
)
11876 #if IS_ENABLED(CONFIG_SYN_COOKIES)
11877 const struct request_sock_ops
*ops
;
11878 struct inet_request_sock
*ireq
;
11879 struct tcp_request_sock
*treq
;
11880 struct request_sock
*req
;
11885 if (attrs__sz
!= sizeof(*attrs
) ||
11886 attrs
->reserved
[0] || attrs
->reserved
[1] || attrs
->reserved
[2])
11889 if (!skb_at_tc_ingress(skb
))
11892 net
= dev_net(skb
->dev
);
11893 if (net
!= sock_net(sk
))
11894 return -ENETUNREACH
;
11896 switch (skb
->protocol
) {
11897 case htons(ETH_P_IP
):
11898 ops
= &tcp_request_sock_ops
;
11901 #if IS_BUILTIN(CONFIG_IPV6)
11902 case htons(ETH_P_IPV6
):
11903 ops
= &tcp6_request_sock_ops
;
11904 min_mss
= IPV6_MIN_MTU
- 60;
11911 if (sk
->sk_type
!= SOCK_STREAM
|| sk
->sk_state
!= TCP_LISTEN
||
11915 if (attrs
->mss
< min_mss
)
11918 if (attrs
->wscale_ok
) {
11919 if (!READ_ONCE(net
->ipv4
.sysctl_tcp_window_scaling
))
11922 if (attrs
->snd_wscale
> TCP_MAX_WSCALE
||
11923 attrs
->rcv_wscale
> TCP_MAX_WSCALE
)
11927 if (attrs
->sack_ok
&& !READ_ONCE(net
->ipv4
.sysctl_tcp_sack
))
11930 if (attrs
->tstamp_ok
) {
11931 if (!READ_ONCE(net
->ipv4
.sysctl_tcp_timestamps
))
11934 tsoff
= attrs
->rcv_tsecr
- tcp_ns_to_ts(attrs
->usec_ts_ok
, tcp_clock_ns());
11937 req
= inet_reqsk_alloc(ops
, sk
, false);
11941 ireq
= inet_rsk(req
);
11942 treq
= tcp_rsk(req
);
11944 req
->rsk_listener
= sk
;
11945 req
->syncookie
= 1;
11946 req
->mss
= attrs
->mss
;
11947 req
->ts_recent
= attrs
->rcv_tsval
;
11949 ireq
->snd_wscale
= attrs
->snd_wscale
;
11950 ireq
->rcv_wscale
= attrs
->rcv_wscale
;
11951 ireq
->tstamp_ok
= !!attrs
->tstamp_ok
;
11952 ireq
->sack_ok
= !!attrs
->sack_ok
;
11953 ireq
->wscale_ok
= !!attrs
->wscale_ok
;
11954 ireq
->ecn_ok
= !!attrs
->ecn_ok
;
11956 treq
->req_usec_ts
= !!attrs
->usec_ts_ok
;
11957 treq
->ts_off
= tsoff
;
11960 skb
->sk
= req_to_sk(req
);
11961 skb
->destructor
= sock_pfree
;
11965 return -EOPNOTSUPP
;
11969 __bpf_kfunc_end_defs();
11971 int bpf_dynptr_from_skb_rdonly(struct sk_buff
*skb
, u64 flags
,
11972 struct bpf_dynptr_kern
*ptr__uninit
)
11976 err
= bpf_dynptr_from_skb(skb
, flags
, ptr__uninit
);
11980 bpf_dynptr_set_rdonly(ptr__uninit
);
11985 BTF_SET8_START(bpf_kfunc_check_set_skb
)
11986 BTF_ID_FLAGS(func
, bpf_dynptr_from_skb
)
11987 BTF_SET8_END(bpf_kfunc_check_set_skb
)
11989 BTF_SET8_START(bpf_kfunc_check_set_xdp
)
11990 BTF_ID_FLAGS(func
, bpf_dynptr_from_xdp
)
11991 BTF_SET8_END(bpf_kfunc_check_set_xdp
)
11993 BTF_SET8_START(bpf_kfunc_check_set_sock_addr
)
11994 BTF_ID_FLAGS(func
, bpf_sock_addr_set_sun_path
)
11995 BTF_SET8_END(bpf_kfunc_check_set_sock_addr
)
11997 BTF_SET8_START(bpf_kfunc_check_set_tcp_reqsk
)
11998 BTF_ID_FLAGS(func
, bpf_sk_assign_tcp_reqsk
, KF_TRUSTED_ARGS
)
11999 BTF_SET8_END(bpf_kfunc_check_set_tcp_reqsk
)
12001 static const struct btf_kfunc_id_set bpf_kfunc_set_skb
= {
12002 .owner
= THIS_MODULE
,
12003 .set
= &bpf_kfunc_check_set_skb
,
12006 static const struct btf_kfunc_id_set bpf_kfunc_set_xdp
= {
12007 .owner
= THIS_MODULE
,
12008 .set
= &bpf_kfunc_check_set_xdp
,
12011 static const struct btf_kfunc_id_set bpf_kfunc_set_sock_addr
= {
12012 .owner
= THIS_MODULE
,
12013 .set
= &bpf_kfunc_check_set_sock_addr
,
12016 static const struct btf_kfunc_id_set bpf_kfunc_set_tcp_reqsk
= {
12017 .owner
= THIS_MODULE
,
12018 .set
= &bpf_kfunc_check_set_tcp_reqsk
,
12021 static int __init
bpf_kfunc_init(void)
12025 ret
= register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS
, &bpf_kfunc_set_skb
);
12026 ret
= ret
?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_ACT
, &bpf_kfunc_set_skb
);
12027 ret
= ret
?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SK_SKB
, &bpf_kfunc_set_skb
);
12028 ret
= ret
?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SOCKET_FILTER
, &bpf_kfunc_set_skb
);
12029 ret
= ret
?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SKB
, &bpf_kfunc_set_skb
);
12030 ret
= ret
?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_OUT
, &bpf_kfunc_set_skb
);
12031 ret
= ret
?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_IN
, &bpf_kfunc_set_skb
);
12032 ret
= ret
?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_XMIT
, &bpf_kfunc_set_skb
);
12033 ret
= ret
?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_SEG6LOCAL
, &bpf_kfunc_set_skb
);
12034 ret
= ret
?: register_btf_kfunc_id_set(BPF_PROG_TYPE_NETFILTER
, &bpf_kfunc_set_skb
);
12035 ret
= ret
?: register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP
, &bpf_kfunc_set_xdp
);
12036 ret
= ret
?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SOCK_ADDR
,
12037 &bpf_kfunc_set_sock_addr
);
12038 return ret
?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS
, &bpf_kfunc_set_tcp_reqsk
);
12040 late_initcall(bpf_kfunc_init
);
12042 __bpf_kfunc_start_defs();
12044 /* bpf_sock_destroy: Destroy the given socket with ECONNABORTED error code.
12046 * The function expects a non-NULL pointer to a socket, and invokes the
12047 * protocol specific socket destroy handlers.
12049 * The helper can only be called from BPF contexts that have acquired the socket
12053 * @sock: Pointer to socket to be destroyed
12056 * On error, may return EPROTONOSUPPORT, EINVAL.
12057 * EPROTONOSUPPORT if protocol specific destroy handler is not supported.
12060 __bpf_kfunc
int bpf_sock_destroy(struct sock_common
*sock
)
12062 struct sock
*sk
= (struct sock
*)sock
;
12064 /* The locking semantics that allow for synchronous execution of the
12065 * destroy handlers are only supported for TCP and UDP.
12066 * Supporting protocols will need to acquire sock lock in the BPF context
12067 * prior to invoking this kfunc.
12069 if (!sk
->sk_prot
->diag_destroy
|| (sk
->sk_protocol
!= IPPROTO_TCP
&&
12070 sk
->sk_protocol
!= IPPROTO_UDP
))
12071 return -EOPNOTSUPP
;
12073 return sk
->sk_prot
->diag_destroy(sk
, ECONNABORTED
);
12076 __bpf_kfunc_end_defs();
12078 BTF_SET8_START(bpf_sk_iter_kfunc_ids
)
12079 BTF_ID_FLAGS(func
, bpf_sock_destroy
, KF_TRUSTED_ARGS
)
12080 BTF_SET8_END(bpf_sk_iter_kfunc_ids
)
12082 static int tracing_iter_filter(const struct bpf_prog
*prog
, u32 kfunc_id
)
12084 if (btf_id_set8_contains(&bpf_sk_iter_kfunc_ids
, kfunc_id
) &&
12085 prog
->expected_attach_type
!= BPF_TRACE_ITER
)
12090 static const struct btf_kfunc_id_set bpf_sk_iter_kfunc_set
= {
12091 .owner
= THIS_MODULE
,
12092 .set
= &bpf_sk_iter_kfunc_ids
,
12093 .filter
= tracing_iter_filter
,
12096 static int init_subsystem(void)
12098 return register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING
, &bpf_sk_iter_kfunc_set
);
12100 late_initcall(init_subsystem
);