1
2
3
4
5#ifndef __LINUX_FILTER_H__
6#define __LINUX_FILTER_H__
7
8#include <stdarg.h>
9
10#include <linux/atomic.h>
11#include <linux/refcount.h>
12#include <linux/compat.h>
13#include <linux/skbuff.h>
14#include <linux/linkage.h>
15#include <linux/printk.h>
16#include <linux/workqueue.h>
17#include <linux/sched.h>
18#include <linux/capability.h>
19#include <linux/cryptohash.h>
20#include <linux/set_memory.h>
21#include <linux/kallsyms.h>
22#include <linux/if_vlan.h>
23#include <linux/vmalloc.h>
24#include <linux/sockptr.h>
25#include <linux/u64_stats_sync.h>
26
27#include <net/sch_generic.h>
28
29#include <asm/byteorder.h>
30#include <uapi/linux/filter.h>
31#include <uapi/linux/bpf.h>
32
33struct sk_buff;
34struct sock;
35struct seccomp_data;
36struct bpf_prog_aux;
37struct xdp_rxq_info;
38struct xdp_buff;
39struct sock_reuseport;
40struct ctl_table;
41struct ctl_table_header;
42
43
44
45
46
47#define BPF_REG_ARG1 BPF_REG_1
48#define BPF_REG_ARG2 BPF_REG_2
49#define BPF_REG_ARG3 BPF_REG_3
50#define BPF_REG_ARG4 BPF_REG_4
51#define BPF_REG_ARG5 BPF_REG_5
52#define BPF_REG_CTX BPF_REG_6
53#define BPF_REG_FP BPF_REG_10
54
55
56#define BPF_REG_A BPF_REG_0
57#define BPF_REG_X BPF_REG_7
58#define BPF_REG_TMP BPF_REG_2
59#define BPF_REG_D BPF_REG_8
60#define BPF_REG_H BPF_REG_9
61
62
63#define BPF_REG_AX MAX_BPF_REG
64#define MAX_BPF_EXT_REG (MAX_BPF_REG + 1)
65#define MAX_BPF_JIT_REG MAX_BPF_EXT_REG
66
67
68#define BPF_TAIL_CALL 0xf0
69
70
71#define BPF_PROBE_MEM 0x20
72
73
74#define BPF_CALL_ARGS 0xe0
75
76
77
78
79#define BPF_NOSPEC 0xc0
80
81
82
83
84
85#define BPF_SYM_ELF_TYPE 't'
86
87
88#define MAX_BPF_STACK 512
89
90
91
92
93
94#define BPF_ALU64_REG(OP, DST, SRC) \
95 ((struct bpf_insn) { \
96 .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \
97 .dst_reg = DST, \
98 .src_reg = SRC, \
99 .off = 0, \
100 .imm = 0 })
101
102#define BPF_ALU32_REG(OP, DST, SRC) \
103 ((struct bpf_insn) { \
104 .code = BPF_ALU | BPF_OP(OP) | BPF_X, \
105 .dst_reg = DST, \
106 .src_reg = SRC, \
107 .off = 0, \
108 .imm = 0 })
109
110
111
112#define BPF_ALU64_IMM(OP, DST, IMM) \
113 ((struct bpf_insn) { \
114 .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \
115 .dst_reg = DST, \
116 .src_reg = 0, \
117 .off = 0, \
118 .imm = IMM })
119
120#define BPF_ALU32_IMM(OP, DST, IMM) \
121 ((struct bpf_insn) { \
122 .code = BPF_ALU | BPF_OP(OP) | BPF_K, \
123 .dst_reg = DST, \
124 .src_reg = 0, \
125 .off = 0, \
126 .imm = IMM })
127
128
129
130#define BPF_ENDIAN(TYPE, DST, LEN) \
131 ((struct bpf_insn) { \
132 .code = BPF_ALU | BPF_END | BPF_SRC(TYPE), \
133 .dst_reg = DST, \
134 .src_reg = 0, \
135 .off = 0, \
136 .imm = LEN })
137
138
139
140#define BPF_MOV64_REG(DST, SRC) \
141 ((struct bpf_insn) { \
142 .code = BPF_ALU64 | BPF_MOV | BPF_X, \
143 .dst_reg = DST, \
144 .src_reg = SRC, \
145 .off = 0, \
146 .imm = 0 })
147
148#define BPF_MOV32_REG(DST, SRC) \
149 ((struct bpf_insn) { \
150 .code = BPF_ALU | BPF_MOV | BPF_X, \
151 .dst_reg = DST, \
152 .src_reg = SRC, \
153 .off = 0, \
154 .imm = 0 })
155
156
157
158#define BPF_MOV64_IMM(DST, IMM) \
159 ((struct bpf_insn) { \
160 .code = BPF_ALU64 | BPF_MOV | BPF_K, \
161 .dst_reg = DST, \
162 .src_reg = 0, \
163 .off = 0, \
164 .imm = IMM })
165
166#define BPF_MOV32_IMM(DST, IMM) \
167 ((struct bpf_insn) { \
168 .code = BPF_ALU | BPF_MOV | BPF_K, \
169 .dst_reg = DST, \
170 .src_reg = 0, \
171 .off = 0, \
172 .imm = IMM })
173
174
175#define BPF_ZEXT_REG(DST) \
176 ((struct bpf_insn) { \
177 .code = BPF_ALU | BPF_MOV | BPF_X, \
178 .dst_reg = DST, \
179 .src_reg = DST, \
180 .off = 0, \
181 .imm = 1 })
182
183static inline bool insn_is_zext(const struct bpf_insn *insn)
184{
185 return insn->code == (BPF_ALU | BPF_MOV | BPF_X) && insn->imm == 1;
186}
187
188
189#define BPF_LD_IMM64(DST, IMM) \
190 BPF_LD_IMM64_RAW(DST, 0, IMM)
191
192#define BPF_LD_IMM64_RAW(DST, SRC, IMM) \
193 ((struct bpf_insn) { \
194 .code = BPF_LD | BPF_DW | BPF_IMM, \
195 .dst_reg = DST, \
196 .src_reg = SRC, \
197 .off = 0, \
198 .imm = (__u32) (IMM) }), \
199 ((struct bpf_insn) { \
200 .code = 0, \
201 .dst_reg = 0, \
202 .src_reg = 0, \
203 .off = 0, \
204 .imm = ((__u64) (IMM)) >> 32 })
205
206
207#define BPF_LD_MAP_FD(DST, MAP_FD) \
208 BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
209
210
211
212#define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \
213 ((struct bpf_insn) { \
214 .code = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE), \
215 .dst_reg = DST, \
216 .src_reg = SRC, \
217 .off = 0, \
218 .imm = IMM })
219
220#define BPF_MOV32_RAW(TYPE, DST, SRC, IMM) \
221 ((struct bpf_insn) { \
222 .code = BPF_ALU | BPF_MOV | BPF_SRC(TYPE), \
223 .dst_reg = DST, \
224 .src_reg = SRC, \
225 .off = 0, \
226 .imm = IMM })
227
228
229
230#define BPF_LD_ABS(SIZE, IMM) \
231 ((struct bpf_insn) { \
232 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \
233 .dst_reg = 0, \
234 .src_reg = 0, \
235 .off = 0, \
236 .imm = IMM })
237
238
239
240#define BPF_LD_IND(SIZE, SRC, IMM) \
241 ((struct bpf_insn) { \
242 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_IND, \
243 .dst_reg = 0, \
244 .src_reg = SRC, \
245 .off = 0, \
246 .imm = IMM })
247
248
249
250#define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \
251 ((struct bpf_insn) { \
252 .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \
253 .dst_reg = DST, \
254 .src_reg = SRC, \
255 .off = OFF, \
256 .imm = 0 })
257
258
259
260#define BPF_STX_MEM(SIZE, DST, SRC, OFF) \
261 ((struct bpf_insn) { \
262 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \
263 .dst_reg = DST, \
264 .src_reg = SRC, \
265 .off = OFF, \
266 .imm = 0 })
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284#define BPF_ATOMIC_OP(SIZE, OP, DST, SRC, OFF) \
285 ((struct bpf_insn) { \
286 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_ATOMIC, \
287 .dst_reg = DST, \
288 .src_reg = SRC, \
289 .off = OFF, \
290 .imm = OP })
291
292
293#define BPF_STX_XADD(SIZE, DST, SRC, OFF) BPF_ATOMIC_OP(SIZE, BPF_ADD, DST, SRC, OFF)
294
295
296
297#define BPF_ST_MEM(SIZE, DST, OFF, IMM) \
298 ((struct bpf_insn) { \
299 .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \
300 .dst_reg = DST, \
301 .src_reg = 0, \
302 .off = OFF, \
303 .imm = IMM })
304
305
306
307#define BPF_JMP_REG(OP, DST, SRC, OFF) \
308 ((struct bpf_insn) { \
309 .code = BPF_JMP | BPF_OP(OP) | BPF_X, \
310 .dst_reg = DST, \
311 .src_reg = SRC, \
312 .off = OFF, \
313 .imm = 0 })
314
315
316
317#define BPF_JMP_IMM(OP, DST, IMM, OFF) \
318 ((struct bpf_insn) { \
319 .code = BPF_JMP | BPF_OP(OP) | BPF_K, \
320 .dst_reg = DST, \
321 .src_reg = 0, \
322 .off = OFF, \
323 .imm = IMM })
324
325
326
327#define BPF_JMP32_REG(OP, DST, SRC, OFF) \
328 ((struct bpf_insn) { \
329 .code = BPF_JMP32 | BPF_OP(OP) | BPF_X, \
330 .dst_reg = DST, \
331 .src_reg = SRC, \
332 .off = OFF, \
333 .imm = 0 })
334
335
336
337#define BPF_JMP32_IMM(OP, DST, IMM, OFF) \
338 ((struct bpf_insn) { \
339 .code = BPF_JMP32 | BPF_OP(OP) | BPF_K, \
340 .dst_reg = DST, \
341 .src_reg = 0, \
342 .off = OFF, \
343 .imm = IMM })
344
345
346
347#define BPF_JMP_A(OFF) \
348 ((struct bpf_insn) { \
349 .code = BPF_JMP | BPF_JA, \
350 .dst_reg = 0, \
351 .src_reg = 0, \
352 .off = OFF, \
353 .imm = 0 })
354
355
356
357#define BPF_CALL_REL(TGT) \
358 ((struct bpf_insn) { \
359 .code = BPF_JMP | BPF_CALL, \
360 .dst_reg = 0, \
361 .src_reg = BPF_PSEUDO_CALL, \
362 .off = 0, \
363 .imm = TGT })
364
365
366
367#define BPF_CAST_CALL(x) \
368 ((u64 (*)(u64, u64, u64, u64, u64))(x))
369
370#define BPF_EMIT_CALL(FUNC) \
371 ((struct bpf_insn) { \
372 .code = BPF_JMP | BPF_CALL, \
373 .dst_reg = 0, \
374 .src_reg = 0, \
375 .off = 0, \
376 .imm = ((FUNC) - __bpf_call_base) })
377
378
379
380#define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \
381 ((struct bpf_insn) { \
382 .code = CODE, \
383 .dst_reg = DST, \
384 .src_reg = SRC, \
385 .off = OFF, \
386 .imm = IMM })
387
388
389
390#define BPF_EXIT_INSN() \
391 ((struct bpf_insn) { \
392 .code = BPF_JMP | BPF_EXIT, \
393 .dst_reg = 0, \
394 .src_reg = 0, \
395 .off = 0, \
396 .imm = 0 })
397
398
399
400#define BPF_ST_NOSPEC() \
401 ((struct bpf_insn) { \
402 .code = BPF_ST | BPF_NOSPEC, \
403 .dst_reg = 0, \
404 .src_reg = 0, \
405 .off = 0, \
406 .imm = 0 })
407
408
409
410#define __BPF_STMT(CODE, K) \
411 ((struct sock_filter) BPF_STMT(CODE, K))
412
413#define __BPF_JUMP(CODE, K, JT, JF) \
414 ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF))
415
416#define bytes_to_bpf_size(bytes) \
417({ \
418 int bpf_size = -EINVAL; \
419 \
420 if (bytes == sizeof(u8)) \
421 bpf_size = BPF_B; \
422 else if (bytes == sizeof(u16)) \
423 bpf_size = BPF_H; \
424 else if (bytes == sizeof(u32)) \
425 bpf_size = BPF_W; \
426 else if (bytes == sizeof(u64)) \
427 bpf_size = BPF_DW; \
428 \
429 bpf_size; \
430})
431
432#define bpf_size_to_bytes(bpf_size) \
433({ \
434 int bytes = -EINVAL; \
435 \
436 if (bpf_size == BPF_B) \
437 bytes = sizeof(u8); \
438 else if (bpf_size == BPF_H) \
439 bytes = sizeof(u16); \
440 else if (bpf_size == BPF_W) \
441 bytes = sizeof(u32); \
442 else if (bpf_size == BPF_DW) \
443 bytes = sizeof(u64); \
444 \
445 bytes; \
446})
447
448#define BPF_SIZEOF(type) \
449 ({ \
450 const int __size = bytes_to_bpf_size(sizeof(type)); \
451 BUILD_BUG_ON(__size < 0); \
452 __size; \
453 })
454
455#define BPF_FIELD_SIZEOF(type, field) \
456 ({ \
457 const int __size = bytes_to_bpf_size(FIELD_SIZEOF(type, field)); \
458 BUILD_BUG_ON(__size < 0); \
459 __size; \
460 })
461
462#define BPF_LDST_BYTES(insn) \
463 ({ \
464 const int __size = bpf_size_to_bytes(BPF_SIZE((insn)->code)); \
465 WARN_ON(__size < 0); \
466 __size; \
467 })
468
469#define __BPF_MAP_0(m, v, ...) v
470#define __BPF_MAP_1(m, v, t, a, ...) m(t, a)
471#define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__)
472#define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__)
473#define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__)
474#define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__)
475
476#define __BPF_REG_0(...) __BPF_PAD(5)
477#define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4)
478#define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3)
479#define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2)
480#define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1)
481#define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__)
482
483#define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__)
484#define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__)
485
486#define __BPF_CAST(t, a) \
487 (__force t) \
488 (__force \
489 typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long), \
490 (unsigned long)0, (t)0))) a
491#define __BPF_V void
492#define __BPF_N
493
494#define __BPF_DECL_ARGS(t, a) t a
495#define __BPF_DECL_REGS(t, a) u64 a
496
497#define __BPF_PAD(n) \
498 __BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2, \
499 u64, __ur_3, u64, __ur_4, u64, __ur_5)
500
501#define BPF_CALL_x(x, name, ...) \
502 static __always_inline \
503 u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)); \
504 typedef u64 (*btf_##name)(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)); \
505 u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)); \
506 u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)) \
507 { \
508 return ((btf_##name)____##name)(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\
509 } \
510 static __always_inline \
511 u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__))
512
513#define BPF_CALL_0(name, ...) BPF_CALL_x(0, name, __VA_ARGS__)
514#define BPF_CALL_1(name, ...) BPF_CALL_x(1, name, __VA_ARGS__)
515#define BPF_CALL_2(name, ...) BPF_CALL_x(2, name, __VA_ARGS__)
516#define BPF_CALL_3(name, ...) BPF_CALL_x(3, name, __VA_ARGS__)
517#define BPF_CALL_4(name, ...) BPF_CALL_x(4, name, __VA_ARGS__)
518#define BPF_CALL_5(name, ...) BPF_CALL_x(5, name, __VA_ARGS__)
519
520#define bpf_ctx_range(TYPE, MEMBER) \
521 offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
522#define bpf_ctx_range_till(TYPE, MEMBER1, MEMBER2) \
523 offsetof(TYPE, MEMBER1) ... offsetofend(TYPE, MEMBER2) - 1
524#if BITS_PER_LONG == 64
525# define bpf_ctx_range_ptr(TYPE, MEMBER) \
526 offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
527#else
528# define bpf_ctx_range_ptr(TYPE, MEMBER) \
529 offsetof(TYPE, MEMBER) ... offsetof(TYPE, MEMBER) + 8 - 1
530#endif
531
532#define bpf_target_off(TYPE, MEMBER, SIZE, PTR_SIZE) \
533 ({ \
534 BUILD_BUG_ON(FIELD_SIZEOF(TYPE, MEMBER) != (SIZE)); \
535 *(PTR_SIZE) = (SIZE); \
536 offsetof(TYPE, MEMBER); \
537 })
538
539
540struct compat_sock_fprog {
541 u16 len;
542 compat_uptr_t filter;
543};
544
545struct sock_fprog_kern {
546 u16 len;
547 struct sock_filter *filter;
548};
549
550
551#define BPF_IMAGE_ALIGNMENT 8
552
553struct bpf_binary_header {
554 u32 pages;
555 u8 image[] __aligned(BPF_IMAGE_ALIGNMENT);
556};
557
558struct bpf_prog_stats {
559 u64 cnt;
560 u64 nsecs;
561 u64 misses;
562 struct u64_stats_sync syncp;
563} __aligned(2 * sizeof(u64));
564
565struct bpf_prog {
566 u16 pages;
567 u16 jited:1,
568 jit_requested:1,
569#ifdef __GENKSYMS__
570 undo_set_mem:1,
571#endif
572 gpl_compatible:1,
573 cb_access:1,
574 dst_needed:1,
575 blinded:1,
576 is_func:1,
577 kprobe_override:1,
578#ifdef __GENKSYMS__
579 has_callchain_buf:1;
580#else
581 has_callchain_buf:1,
582 enforce_expected_attach_type:1,
583 call_get_stack:1;
584#endif
585 enum bpf_prog_type type;
586 enum bpf_attach_type expected_attach_type;
587 u32 len;
588 u32 jited_len;
589 u8 tag[BPF_TAG_SIZE];
590 struct bpf_prog_aux *aux;
591 struct sock_fprog_kern *orig_prog;
592 RH_KABI_BROKEN_INSERT(struct bpf_prog_stats __percpu *stats)
593 RH_KABI_BROKEN_INSERT(int __percpu *active)
594 unsigned int (*bpf_func)(const void *ctx,
595 const struct bpf_insn *insn);
596
597 union {
598 struct sock_filter insns[0];
599 struct bpf_insn insnsi[0];
600 };
601};
602
603struct sk_filter {
604 refcount_t refcnt;
605 struct rcu_head rcu;
606 struct bpf_prog *prog;
607};
608
609DECLARE_STATIC_KEY_FALSE(bpf_stats_enabled_key);
610
611#define __BPF_PROG_RUN(prog, ctx, dfunc) ({ \
612 u32 __ret; \
613 cant_migrate(); \
614 if (static_branch_unlikely(&bpf_stats_enabled_key)) { \
615 struct bpf_prog_stats *__stats; \
616 u64 __start = sched_clock(); \
617 __ret = dfunc(ctx, (prog)->insnsi, (prog)->bpf_func); \
618 __stats = this_cpu_ptr(prog->stats); \
619 u64_stats_update_begin(&__stats->syncp); \
620 __stats->cnt++; \
621 __stats->nsecs += sched_clock() - __start; \
622 u64_stats_update_end(&__stats->syncp); \
623 } else { \
624 __ret = dfunc(ctx, (prog)->insnsi, (prog)->bpf_func); \
625 } \
626 __ret; })
627
628#define BPF_PROG_RUN(prog, ctx) \
629 __BPF_PROG_RUN(prog, ctx, bpf_dispatcher_nop_func)
630
631
632
633
634
635
636
637
638
639
640
641
642static inline u32 bpf_prog_run_pin_on_cpu(const struct bpf_prog *prog,
643 const void *ctx)
644{
645 u32 ret;
646
647 migrate_disable();
648 ret = __BPF_PROG_RUN(prog, ctx, bpf_dispatcher_nop_func);
649 migrate_enable();
650 return ret;
651}
652
653#define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN
654
655struct bpf_skb_data_end {
656 struct qdisc_skb_cb qdisc_cb;
657 void *data_meta;
658 void *data_end;
659};
660
661struct bpf_nh_params {
662 u32 nh_family;
663 union {
664 u32 ipv4_nh;
665 struct in6_addr ipv6_nh;
666 };
667};
668
669struct bpf_redirect_info {
670 u32 flags;
671 u32 tgt_index;
672 void *tgt_value;
673 u32 map_id;
674 enum bpf_map_type map_type;
675 u32 kern_flags;
676 struct bpf_nh_params nh;
677};
678
679DECLARE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info);
680
681
682#define BPF_RI_F_RF_NO_DIRECT BIT(0)
683
684
685
686
687
688
689
690static inline void bpf_compute_data_pointers(struct sk_buff *skb)
691{
692 struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
693
694 BUILD_BUG_ON(sizeof(*cb) > FIELD_SIZEOF(struct sk_buff, cb));
695 cb->data_meta = skb->data - skb_metadata_len(skb);
696 cb->data_end = skb->data + skb_headlen(skb);
697}
698
699
700
701
702static inline void bpf_compute_and_save_data_end(
703 struct sk_buff *skb, void **saved_data_end)
704{
705 struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
706
707 *saved_data_end = cb->data_end;
708 cb->data_end = skb->data + skb_headlen(skb);
709}
710
711
712static inline void bpf_restore_data_end(
713 struct sk_buff *skb, void *saved_data_end)
714{
715 struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
716
717 cb->data_end = saved_data_end;
718}
719
720static inline u8 *bpf_skb_cb(struct sk_buff *skb)
721{
722
723
724
725
726
727
728
729
730
731
732 BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != BPF_SKB_CB_LEN);
733 BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) !=
734 FIELD_SIZEOF(struct qdisc_skb_cb, data));
735
736 return qdisc_skb_cb(skb)->data;
737}
738
739
740static inline u32 __bpf_prog_run_save_cb(const struct bpf_prog *prog,
741 struct sk_buff *skb)
742{
743 u8 *cb_data = bpf_skb_cb(skb);
744 u8 cb_saved[BPF_SKB_CB_LEN];
745 u32 res;
746
747 if (unlikely(prog->cb_access)) {
748 memcpy(cb_saved, cb_data, sizeof(cb_saved));
749 memset(cb_data, 0, sizeof(cb_saved));
750 }
751
752 res = BPF_PROG_RUN(prog, skb);
753
754 if (unlikely(prog->cb_access))
755 memcpy(cb_data, cb_saved, sizeof(cb_saved));
756
757 return res;
758}
759
760static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
761 struct sk_buff *skb)
762{
763 u32 res;
764
765 migrate_disable();
766 res = __bpf_prog_run_save_cb(prog, skb);
767 migrate_enable();
768 return res;
769}
770
771static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog,
772 struct sk_buff *skb)
773{
774 u8 *cb_data = bpf_skb_cb(skb);
775 u32 res;
776
777 if (unlikely(prog->cb_access))
778 memset(cb_data, 0, BPF_SKB_CB_LEN);
779
780 res = bpf_prog_run_pin_on_cpu(prog, skb);
781 return res;
782}
783
784DECLARE_BPF_DISPATCHER(xdp)
785
786static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
787 struct xdp_buff *xdp)
788{
789
790
791
792
793
794
795 return __BPF_PROG_RUN(prog, xdp, BPF_DISPATCHER_FUNC(xdp));
796}
797
798void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog);
799
800static inline u32 bpf_prog_insn_size(const struct bpf_prog *prog)
801{
802 return prog->len * sizeof(struct bpf_insn);
803}
804
805static inline u32 bpf_prog_tag_scratch_size(const struct bpf_prog *prog)
806{
807 return round_up(bpf_prog_insn_size(prog) +
808 sizeof(__be64) + 1, SHA1_BLOCK_SIZE);
809}
810
811static inline unsigned int bpf_prog_size(unsigned int proglen)
812{
813 return max(sizeof(struct bpf_prog),
814 offsetof(struct bpf_prog, insns[proglen]));
815}
816
817static inline bool bpf_prog_was_classic(const struct bpf_prog *prog)
818{
819
820
821
822
823
824 return prog->type == BPF_PROG_TYPE_UNSPEC;
825}
826
827static inline u32 bpf_ctx_off_adjust_machine(u32 size)
828{
829 const u32 size_machine = sizeof(unsigned long);
830
831 if (size > size_machine && size % size_machine == 0)
832 size = size_machine;
833
834 return size;
835}
836
837static inline bool
838bpf_ctx_narrow_access_ok(u32 off, u32 size, u32 size_default)
839{
840 return size <= size_default && (size & (size - 1)) == 0;
841}
842
843static inline u8
844bpf_ctx_narrow_access_offset(u32 off, u32 size, u32 size_default)
845{
846 u8 access_off = off & (size_default - 1);
847
848#ifdef __LITTLE_ENDIAN
849 return access_off;
850#else
851 return size_default - (access_off + size);
852#endif
853}
854
855#define bpf_ctx_wide_access_ok(off, size, type, field) \
856 (size == sizeof(__u64) && \
857 off >= offsetof(type, field) && \
858 off + sizeof(__u64) <= offsetofend(type, field) && \
859 off % sizeof(__u64) == 0)
860
861#define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
862
863static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
864{
865#ifndef CONFIG_BPF_JIT_ALWAYS_ON
866 if (!fp->jited) {
867 set_vm_flush_reset_perms(fp);
868 set_memory_ro((unsigned long)fp, fp->pages);
869 }
870#endif
871}
872
873static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr)
874{
875 set_vm_flush_reset_perms(hdr);
876 set_memory_ro((unsigned long)hdr, hdr->pages);
877 set_memory_x((unsigned long)hdr, hdr->pages);
878}
879
880static inline struct bpf_binary_header *
881bpf_jit_binary_hdr(const struct bpf_prog *fp)
882{
883 unsigned long real_start = (unsigned long)fp->bpf_func;
884 unsigned long addr = real_start & PAGE_MASK;
885
886 return (void *)addr;
887}
888
889int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap);
890static inline int sk_filter(struct sock *sk, struct sk_buff *skb)
891{
892 return sk_filter_trim_cap(sk, skb, 1);
893}
894
895struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err);
896void bpf_prog_free(struct bpf_prog *fp);
897
898bool bpf_opcode_in_insntable(u8 code);
899
900void bpf_prog_free_linfo(struct bpf_prog *prog);
901void bpf_prog_fill_jited_linfo(struct bpf_prog *prog,
902 const u32 *insn_to_jit_off);
903int bpf_prog_alloc_jited_linfo(struct bpf_prog *prog);
904void bpf_prog_jit_attempt_done(struct bpf_prog *prog);
905
906struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags);
907struct bpf_prog *bpf_prog_alloc_no_stats(unsigned int size, gfp_t gfp_extra_flags);
908struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
909 gfp_t gfp_extra_flags);
910void __bpf_prog_free(struct bpf_prog *fp);
911
912static inline void bpf_prog_unlock_free(struct bpf_prog *fp)
913{
914 __bpf_prog_free(fp);
915}
916
917typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter,
918 unsigned int flen);
919
920int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog);
921int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
922 bpf_aux_classic_check_t trans, bool save_orig);
923void bpf_prog_destroy(struct bpf_prog *fp);
924
925int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
926int sk_attach_bpf(u32 ufd, struct sock *sk);
927int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk);
928int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk);
929void sk_reuseport_prog_free(struct bpf_prog *prog);
930int sk_detach_filter(struct sock *sk);
931int sk_get_filter(struct sock *sk, struct sock_filter __user *filter,
932 unsigned int len);
933
934bool sk_filter_charge(struct sock *sk, struct sk_filter *fp);
935void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);
936
937u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
938#define __bpf_call_base_args \
939 ((u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)) \
940 (void *)__bpf_call_base)
941
942struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
943void bpf_jit_compile(struct bpf_prog *prog);
944bool bpf_jit_needs_zext(void);
945bool bpf_jit_supports_kfunc_call(void);
946bool bpf_helper_changes_pkt_data(void *func);
947
948static inline bool bpf_dump_raw_ok(const struct cred *cred)
949{
950
951
952
953 return kallsyms_show_value(cred);
954}
955
956struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
957 const struct bpf_insn *patch, u32 len);
958int bpf_remove_insns(struct bpf_prog *prog, u32 off, u32 cnt);
959
960void bpf_clear_redirect_map(struct bpf_map *map);
961
962static inline bool xdp_return_frame_no_direct(void)
963{
964 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
965
966 return ri->kern_flags & BPF_RI_F_RF_NO_DIRECT;
967}
968
969static inline void xdp_set_return_frame_no_direct(void)
970{
971 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
972
973 ri->kern_flags |= BPF_RI_F_RF_NO_DIRECT;
974}
975
976static inline void xdp_clear_return_frame_no_direct(void)
977{
978 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
979
980 ri->kern_flags &= ~BPF_RI_F_RF_NO_DIRECT;
981}
982
983static inline int xdp_ok_fwd_dev(const struct net_device *fwd,
984 unsigned int pktlen)
985{
986 unsigned int len;
987
988 if (unlikely(!(fwd->flags & IFF_UP)))
989 return -ENETDOWN;
990
991 len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN;
992 if (pktlen > len)
993 return -EMSGSIZE;
994
995 return 0;
996}
997
998
999
1000
1001
1002
1003
1004int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
1005 struct xdp_buff *xdp, struct bpf_prog *prog);
1006int xdp_do_redirect(struct net_device *dev,
1007 struct xdp_buff *xdp,
1008 struct bpf_prog *prog);
1009void xdp_do_flush(void);
1010
1011
1012
1013
1014
1015#define xdp_do_flush_map xdp_do_flush
1016
1017void bpf_warn_invalid_xdp_action(u32 act);
1018
1019#ifdef CONFIG_INET
1020struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
1021 struct bpf_prog *prog, struct sk_buff *skb,
1022 u32 hash);
1023#else
1024static inline struct sock *
1025bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
1026 struct bpf_prog *prog, struct sk_buff *skb,
1027 u32 hash)
1028{
1029 return NULL;
1030}
1031#endif
1032
1033#ifdef CONFIG_BPF_JIT
1034extern int bpf_jit_enable;
1035extern int bpf_jit_harden;
1036extern int bpf_jit_kallsyms;
1037extern long bpf_jit_limit;
1038
1039typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size);
1040
1041struct bpf_binary_header *
1042bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
1043 unsigned int alignment,
1044 bpf_jit_fill_hole_t bpf_fill_ill_insns);
1045void bpf_jit_binary_free(struct bpf_binary_header *hdr);
1046u64 bpf_jit_alloc_exec_limit(void);
1047void *bpf_jit_alloc_exec(unsigned long size);
1048void bpf_jit_free_exec(void *addr);
1049void bpf_jit_free(struct bpf_prog *fp);
1050
1051int bpf_jit_add_poke_descriptor(struct bpf_prog *prog,
1052 struct bpf_jit_poke_descriptor *poke);
1053
1054int bpf_jit_get_func_addr(const struct bpf_prog *prog,
1055 const struct bpf_insn *insn, bool extra_pass,
1056 u64 *func_addr, bool *func_addr_fixed);
1057
1058struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp);
1059void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other);
1060
1061static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
1062 u32 pass, void *image)
1063{
1064 pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen,
1065 proglen, pass, image, current->comm, task_pid_nr(current));
1066
1067 if (image)
1068 print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
1069 16, 1, image, proglen, false);
1070}
1071
1072static inline bool bpf_jit_is_ebpf(void)
1073{
1074# ifdef CONFIG_HAVE_EBPF_JIT
1075 return true;
1076# else
1077 return false;
1078# endif
1079}
1080
1081static inline bool ebpf_jit_enabled(void)
1082{
1083 return bpf_jit_enable && bpf_jit_is_ebpf();
1084}
1085
1086static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
1087{
1088 return fp->jited && bpf_jit_is_ebpf();
1089}
1090
1091static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
1092{
1093
1094
1095
1096
1097 if (!bpf_jit_is_ebpf())
1098 return false;
1099 if (!prog->jit_requested)
1100 return false;
1101 if (!bpf_jit_harden)
1102 return false;
1103 if (bpf_jit_harden == 1 && capable(CAP_SYS_ADMIN))
1104 return false;
1105
1106 return true;
1107}
1108
1109static inline bool bpf_jit_kallsyms_enabled(void)
1110{
1111
1112
1113
1114 if (bpf_jit_harden)
1115 return false;
1116 if (!bpf_jit_kallsyms)
1117 return false;
1118 if (bpf_jit_kallsyms == 1)
1119 return true;
1120
1121 return false;
1122}
1123
1124const char *__bpf_address_lookup(unsigned long addr, unsigned long *size,
1125 unsigned long *off, char *sym);
1126bool is_bpf_text_address(unsigned long addr);
1127int bpf_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
1128 char *sym);
1129
1130static inline const char *
1131bpf_address_lookup(unsigned long addr, unsigned long *size,
1132 unsigned long *off, char **modname, char *sym)
1133{
1134 const char *ret = __bpf_address_lookup(addr, size, off, sym);
1135
1136 if (ret && modname)
1137 *modname = NULL;
1138 return ret;
1139}
1140
1141void bpf_prog_kallsyms_add(struct bpf_prog *fp);
1142void bpf_prog_kallsyms_del(struct bpf_prog *fp);
1143
1144#else
1145
1146static inline bool ebpf_jit_enabled(void)
1147{
1148 return false;
1149}
1150
1151static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
1152{
1153 return false;
1154}
1155
1156static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
1157{
1158 return false;
1159}
1160
1161static inline int
1162bpf_jit_add_poke_descriptor(struct bpf_prog *prog,
1163 struct bpf_jit_poke_descriptor *poke)
1164{
1165 return -ENOTSUPP;
1166}
1167
1168static inline void bpf_jit_free(struct bpf_prog *fp)
1169{
1170 bpf_prog_unlock_free(fp);
1171}
1172
1173static inline bool bpf_jit_kallsyms_enabled(void)
1174{
1175 return false;
1176}
1177
1178static inline const char *
1179__bpf_address_lookup(unsigned long addr, unsigned long *size,
1180 unsigned long *off, char *sym)
1181{
1182 return NULL;
1183}
1184
1185static inline bool is_bpf_text_address(unsigned long addr)
1186{
1187 return false;
1188}
1189
1190static inline int bpf_get_kallsym(unsigned int symnum, unsigned long *value,
1191 char *type, char *sym)
1192{
1193 return -ERANGE;
1194}
1195
1196static inline const char *
1197bpf_address_lookup(unsigned long addr, unsigned long *size,
1198 unsigned long *off, char **modname, char *sym)
1199{
1200 return NULL;
1201}
1202
1203static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp)
1204{
1205}
1206
1207static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp)
1208{
1209}
1210
1211#endif
1212
1213void bpf_prog_kallsyms_del_all(struct bpf_prog *fp);
1214
1215#define BPF_ANC BIT(15)
1216
1217static inline bool bpf_needs_clear_a(const struct sock_filter *first)
1218{
1219 switch (first->code) {
1220 case BPF_RET | BPF_K:
1221 case BPF_LD | BPF_W | BPF_LEN:
1222 return false;
1223
1224 case BPF_LD | BPF_W | BPF_ABS:
1225 case BPF_LD | BPF_H | BPF_ABS:
1226 case BPF_LD | BPF_B | BPF_ABS:
1227 if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X)
1228 return true;
1229 return false;
1230
1231 default:
1232 return true;
1233 }
1234}
1235
1236static inline u16 bpf_anc_helper(const struct sock_filter *ftest)
1237{
1238 BUG_ON(ftest->code & BPF_ANC);
1239
1240 switch (ftest->code) {
1241 case BPF_LD | BPF_W | BPF_ABS:
1242 case BPF_LD | BPF_H | BPF_ABS:
1243 case BPF_LD | BPF_B | BPF_ABS:
1244#define BPF_ANCILLARY(CODE) case SKF_AD_OFF + SKF_AD_##CODE: \
1245 return BPF_ANC | SKF_AD_##CODE
1246 switch (ftest->k) {
1247 BPF_ANCILLARY(PROTOCOL);
1248 BPF_ANCILLARY(PKTTYPE);
1249 BPF_ANCILLARY(IFINDEX);
1250 BPF_ANCILLARY(NLATTR);
1251 BPF_ANCILLARY(NLATTR_NEST);
1252 BPF_ANCILLARY(MARK);
1253 BPF_ANCILLARY(QUEUE);
1254 BPF_ANCILLARY(HATYPE);
1255 BPF_ANCILLARY(RXHASH);
1256 BPF_ANCILLARY(CPU);
1257 BPF_ANCILLARY(ALU_XOR_X);
1258 BPF_ANCILLARY(VLAN_TAG);
1259 BPF_ANCILLARY(VLAN_TAG_PRESENT);
1260 BPF_ANCILLARY(PAY_OFFSET);
1261 BPF_ANCILLARY(RANDOM);
1262 BPF_ANCILLARY(VLAN_TPID);
1263 }
1264
1265 default:
1266 return ftest->code;
1267 }
1268}
1269
1270void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb,
1271 int k, unsigned int size);
1272
1273static inline int bpf_tell_extensions(void)
1274{
1275 return SKF_AD_MAX;
1276}
1277
1278struct bpf_sock_addr_kern {
1279 struct sock *sk;
1280 struct sockaddr *uaddr;
1281
1282
1283
1284
1285 u64 tmp_reg;
1286 void *t_ctx;
1287};
1288
1289struct bpf_sock_ops_kern {
1290 struct sock *sk;
1291 union {
1292 u32 args[4];
1293 u32 reply;
1294 u32 replylong[4];
1295 };
1296 struct sk_buff *syn_skb;
1297 struct sk_buff *skb;
1298 void *skb_data_end;
1299 u8 op;
1300 u8 is_fullsock;
1301 u8 remaining_opt_len;
1302 u64 temp;
1303
1304
1305
1306
1307
1308
1309
1310
1311};
1312
1313struct bpf_sysctl_kern {
1314 struct ctl_table_header *head;
1315 struct ctl_table *table;
1316 void *cur_val;
1317 size_t cur_len;
1318 void *new_val;
1319 size_t new_len;
1320 int new_updated;
1321 int write;
1322 loff_t *ppos;
1323
1324 u64 tmp_reg;
1325};
1326
1327#define BPF_SOCKOPT_KERN_BUF_SIZE 32
1328struct bpf_sockopt_buf {
1329 u8 data[BPF_SOCKOPT_KERN_BUF_SIZE];
1330};
1331
1332struct bpf_sockopt_kern {
1333 struct sock *sk;
1334 u8 *optval;
1335 u8 *optval_end;
1336 s32 level;
1337 s32 optname;
1338 s32 optlen;
1339 s32 retval;
1340};
1341
1342int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len);
1343
1344struct bpf_sk_lookup_kern {
1345 u16 family;
1346 u16 protocol;
1347 __be16 sport;
1348 u16 dport;
1349 struct {
1350 __be32 saddr;
1351 __be32 daddr;
1352 } v4;
1353 struct {
1354 const struct in6_addr *saddr;
1355 const struct in6_addr *daddr;
1356 } v6;
1357 struct sock *selected_sk;
1358 bool no_reuseport;
1359};
1360
1361extern struct static_key_false bpf_sk_lookup_enabled;
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384#define BPF_PROG_SK_LOOKUP_RUN_ARRAY(array, ctx, func) \
1385 ({ \
1386 struct bpf_sk_lookup_kern *_ctx = &(ctx); \
1387 struct bpf_prog_array_item *_item; \
1388 struct sock *_selected_sk = NULL; \
1389 bool _no_reuseport = false; \
1390 struct bpf_prog *_prog; \
1391 bool _all_pass = true; \
1392 u32 _ret; \
1393 \
1394 migrate_disable(); \
1395 _item = &(array)->items[0]; \
1396 while ((_prog = READ_ONCE(_item->prog))) { \
1397 \
1398 _ctx->selected_sk = _selected_sk; \
1399 _ctx->no_reuseport = _no_reuseport; \
1400 \
1401 _ret = func(_prog, _ctx); \
1402 if (_ret == SK_PASS && _ctx->selected_sk) { \
1403 \
1404 _selected_sk = _ctx->selected_sk; \
1405 _no_reuseport = _ctx->no_reuseport; \
1406 } else if (_ret == SK_DROP && _all_pass) { \
1407 _all_pass = false; \
1408 } \
1409 _item++; \
1410 } \
1411 _ctx->selected_sk = _selected_sk; \
1412 _ctx->no_reuseport = _no_reuseport; \
1413 migrate_enable(); \
1414 _all_pass || _selected_sk ? SK_PASS : SK_DROP; \
1415 })
1416
1417static inline bool bpf_sk_lookup_run_v4(struct net *net, int protocol,
1418 const __be32 saddr, const __be16 sport,
1419 const __be32 daddr, const u16 dport,
1420 struct sock **psk)
1421{
1422 struct bpf_prog_array *run_array;
1423 struct sock *selected_sk = NULL;
1424 bool no_reuseport = false;
1425
1426 rcu_read_lock();
1427 run_array = rcu_dereference(net->bpf.run_array[NETNS_BPF_SK_LOOKUP]);
1428 if (run_array) {
1429 struct bpf_sk_lookup_kern ctx = {
1430 .family = AF_INET,
1431 .protocol = protocol,
1432 .v4.saddr = saddr,
1433 .v4.daddr = daddr,
1434 .sport = sport,
1435 .dport = dport,
1436 };
1437 u32 act;
1438
1439 act = BPF_PROG_SK_LOOKUP_RUN_ARRAY(run_array, ctx, BPF_PROG_RUN);
1440 if (act == SK_PASS) {
1441 selected_sk = ctx.selected_sk;
1442 no_reuseport = ctx.no_reuseport;
1443 } else {
1444 selected_sk = ERR_PTR(-ECONNREFUSED);
1445 }
1446 }
1447 rcu_read_unlock();
1448 *psk = selected_sk;
1449 return no_reuseport;
1450}
1451
1452#if IS_ENABLED(CONFIG_IPV6)
1453static inline bool bpf_sk_lookup_run_v6(struct net *net, int protocol,
1454 const struct in6_addr *saddr,
1455 const __be16 sport,
1456 const struct in6_addr *daddr,
1457 const u16 dport,
1458 struct sock **psk)
1459{
1460 struct bpf_prog_array *run_array;
1461 struct sock *selected_sk = NULL;
1462 bool no_reuseport = false;
1463
1464 rcu_read_lock();
1465 run_array = rcu_dereference(net->bpf.run_array[NETNS_BPF_SK_LOOKUP]);
1466 if (run_array) {
1467 struct bpf_sk_lookup_kern ctx = {
1468 .family = AF_INET6,
1469 .protocol = protocol,
1470 .v6.saddr = saddr,
1471 .v6.daddr = daddr,
1472 .sport = sport,
1473 .dport = dport,
1474 };
1475 u32 act;
1476
1477 act = BPF_PROG_SK_LOOKUP_RUN_ARRAY(run_array, ctx, BPF_PROG_RUN);
1478 if (act == SK_PASS) {
1479 selected_sk = ctx.selected_sk;
1480 no_reuseport = ctx.no_reuseport;
1481 } else {
1482 selected_sk = ERR_PTR(-ECONNREFUSED);
1483 }
1484 }
1485 rcu_read_unlock();
1486 *psk = selected_sk;
1487 return no_reuseport;
1488}
1489#endif
1490
1491static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u32 ifindex, u64 flags,
1492 void *lookup_elem(struct bpf_map *map, u32 key))
1493{
1494 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
1495
1496
1497 if (unlikely(flags > XDP_TX))
1498 return XDP_ABORTED;
1499
1500 ri->tgt_value = lookup_elem(map, ifindex);
1501 if (unlikely(!ri->tgt_value)) {
1502
1503
1504
1505
1506
1507 ri->map_id = INT_MAX;
1508 ri->map_type = BPF_MAP_TYPE_UNSPEC;
1509 return flags;
1510 }
1511
1512 ri->tgt_index = ifindex;
1513 ri->map_id = map->id;
1514 ri->map_type = map->map_type;
1515
1516 return XDP_REDIRECT;
1517}
1518
1519#endif
1520