1
2
3
4
5#ifndef __LINUX_FILTER_H__
6#define __LINUX_FILTER_H__
7
8#include <linux/atomic.h>
9#include <linux/bpf.h>
10#include <linux/refcount.h>
11#include <linux/compat.h>
12#include <linux/skbuff.h>
13#include <linux/linkage.h>
14#include <linux/printk.h>
15#include <linux/workqueue.h>
16#include <linux/sched.h>
17#include <linux/capability.h>
18#include <linux/set_memory.h>
19#include <linux/kallsyms.h>
20#include <linux/if_vlan.h>
21#include <linux/vmalloc.h>
22#include <linux/sockptr.h>
23#include <crypto/sha1.h>
24#include <linux/u64_stats_sync.h>
25
26#include <net/sch_generic.h>
27
28#include <asm/byteorder.h>
29#include <uapi/linux/filter.h>
30
31struct sk_buff;
32struct sock;
33struct seccomp_data;
34struct bpf_prog_aux;
35struct xdp_rxq_info;
36struct xdp_buff;
37struct sock_reuseport;
38struct ctl_table;
39struct ctl_table_header;
40
41
42
43
44
45#define BPF_REG_ARG1 BPF_REG_1
46#define BPF_REG_ARG2 BPF_REG_2
47#define BPF_REG_ARG3 BPF_REG_3
48#define BPF_REG_ARG4 BPF_REG_4
49#define BPF_REG_ARG5 BPF_REG_5
50#define BPF_REG_CTX BPF_REG_6
51#define BPF_REG_FP BPF_REG_10
52
53
54#define BPF_REG_A BPF_REG_0
55#define BPF_REG_X BPF_REG_7
56#define BPF_REG_TMP BPF_REG_2
57#define BPF_REG_D BPF_REG_8
58#define BPF_REG_H BPF_REG_9
59
60
61#define BPF_REG_AX MAX_BPF_REG
62#define MAX_BPF_EXT_REG (MAX_BPF_REG + 1)
63#define MAX_BPF_JIT_REG MAX_BPF_EXT_REG
64
65
66#define BPF_TAIL_CALL 0xf0
67
68
69#define BPF_PROBE_MEM 0x20
70
71
72#define BPF_CALL_ARGS 0xe0
73
74
75
76
77#define BPF_NOSPEC 0xc0
78
79
80
81
82
83#define BPF_SYM_ELF_TYPE 't'
84
85
86#define MAX_BPF_STACK 512
87
88
89
90
91
92#define BPF_ALU64_REG(OP, DST, SRC) \
93 ((struct bpf_insn) { \
94 .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \
95 .dst_reg = DST, \
96 .src_reg = SRC, \
97 .off = 0, \
98 .imm = 0 })
99
100#define BPF_ALU32_REG(OP, DST, SRC) \
101 ((struct bpf_insn) { \
102 .code = BPF_ALU | BPF_OP(OP) | BPF_X, \
103 .dst_reg = DST, \
104 .src_reg = SRC, \
105 .off = 0, \
106 .imm = 0 })
107
108
109
110#define BPF_ALU64_IMM(OP, DST, IMM) \
111 ((struct bpf_insn) { \
112 .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \
113 .dst_reg = DST, \
114 .src_reg = 0, \
115 .off = 0, \
116 .imm = IMM })
117
118#define BPF_ALU32_IMM(OP, DST, IMM) \
119 ((struct bpf_insn) { \
120 .code = BPF_ALU | BPF_OP(OP) | BPF_K, \
121 .dst_reg = DST, \
122 .src_reg = 0, \
123 .off = 0, \
124 .imm = IMM })
125
126
127
128#define BPF_ENDIAN(TYPE, DST, LEN) \
129 ((struct bpf_insn) { \
130 .code = BPF_ALU | BPF_END | BPF_SRC(TYPE), \
131 .dst_reg = DST, \
132 .src_reg = 0, \
133 .off = 0, \
134 .imm = LEN })
135
136
137
138#define BPF_MOV64_REG(DST, SRC) \
139 ((struct bpf_insn) { \
140 .code = BPF_ALU64 | BPF_MOV | BPF_X, \
141 .dst_reg = DST, \
142 .src_reg = SRC, \
143 .off = 0, \
144 .imm = 0 })
145
146#define BPF_MOV32_REG(DST, SRC) \
147 ((struct bpf_insn) { \
148 .code = BPF_ALU | BPF_MOV | BPF_X, \
149 .dst_reg = DST, \
150 .src_reg = SRC, \
151 .off = 0, \
152 .imm = 0 })
153
154
155
156#define BPF_MOV64_IMM(DST, IMM) \
157 ((struct bpf_insn) { \
158 .code = BPF_ALU64 | BPF_MOV | BPF_K, \
159 .dst_reg = DST, \
160 .src_reg = 0, \
161 .off = 0, \
162 .imm = IMM })
163
164#define BPF_MOV32_IMM(DST, IMM) \
165 ((struct bpf_insn) { \
166 .code = BPF_ALU | BPF_MOV | BPF_K, \
167 .dst_reg = DST, \
168 .src_reg = 0, \
169 .off = 0, \
170 .imm = IMM })
171
172
173#define BPF_ZEXT_REG(DST) \
174 ((struct bpf_insn) { \
175 .code = BPF_ALU | BPF_MOV | BPF_X, \
176 .dst_reg = DST, \
177 .src_reg = DST, \
178 .off = 0, \
179 .imm = 1 })
180
181static inline bool insn_is_zext(const struct bpf_insn *insn)
182{
183 return insn->code == (BPF_ALU | BPF_MOV | BPF_X) && insn->imm == 1;
184}
185
186
187#define BPF_LD_IMM64(DST, IMM) \
188 BPF_LD_IMM64_RAW(DST, 0, IMM)
189
190#define BPF_LD_IMM64_RAW(DST, SRC, IMM) \
191 ((struct bpf_insn) { \
192 .code = BPF_LD | BPF_DW | BPF_IMM, \
193 .dst_reg = DST, \
194 .src_reg = SRC, \
195 .off = 0, \
196 .imm = (__u32) (IMM) }), \
197 ((struct bpf_insn) { \
198 .code = 0, \
199 .dst_reg = 0, \
200 .src_reg = 0, \
201 .off = 0, \
202 .imm = ((__u64) (IMM)) >> 32 })
203
204
205#define BPF_LD_MAP_FD(DST, MAP_FD) \
206 BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
207
208
209
210#define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \
211 ((struct bpf_insn) { \
212 .code = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE), \
213 .dst_reg = DST, \
214 .src_reg = SRC, \
215 .off = 0, \
216 .imm = IMM })
217
218#define BPF_MOV32_RAW(TYPE, DST, SRC, IMM) \
219 ((struct bpf_insn) { \
220 .code = BPF_ALU | BPF_MOV | BPF_SRC(TYPE), \
221 .dst_reg = DST, \
222 .src_reg = SRC, \
223 .off = 0, \
224 .imm = IMM })
225
226
227
228#define BPF_LD_ABS(SIZE, IMM) \
229 ((struct bpf_insn) { \
230 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \
231 .dst_reg = 0, \
232 .src_reg = 0, \
233 .off = 0, \
234 .imm = IMM })
235
236
237
238#define BPF_LD_IND(SIZE, SRC, IMM) \
239 ((struct bpf_insn) { \
240 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_IND, \
241 .dst_reg = 0, \
242 .src_reg = SRC, \
243 .off = 0, \
244 .imm = IMM })
245
246
247
248#define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \
249 ((struct bpf_insn) { \
250 .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \
251 .dst_reg = DST, \
252 .src_reg = SRC, \
253 .off = OFF, \
254 .imm = 0 })
255
256
257
258#define BPF_STX_MEM(SIZE, DST, SRC, OFF) \
259 ((struct bpf_insn) { \
260 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \
261 .dst_reg = DST, \
262 .src_reg = SRC, \
263 .off = OFF, \
264 .imm = 0 })
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282#define BPF_ATOMIC_OP(SIZE, OP, DST, SRC, OFF) \
283 ((struct bpf_insn) { \
284 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_ATOMIC, \
285 .dst_reg = DST, \
286 .src_reg = SRC, \
287 .off = OFF, \
288 .imm = OP })
289
290
291#define BPF_STX_XADD(SIZE, DST, SRC, OFF) BPF_ATOMIC_OP(SIZE, BPF_ADD, DST, SRC, OFF)
292
293
294
295#define BPF_ST_MEM(SIZE, DST, OFF, IMM) \
296 ((struct bpf_insn) { \
297 .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \
298 .dst_reg = DST, \
299 .src_reg = 0, \
300 .off = OFF, \
301 .imm = IMM })
302
303
304
305#define BPF_JMP_REG(OP, DST, SRC, OFF) \
306 ((struct bpf_insn) { \
307 .code = BPF_JMP | BPF_OP(OP) | BPF_X, \
308 .dst_reg = DST, \
309 .src_reg = SRC, \
310 .off = OFF, \
311 .imm = 0 })
312
313
314
315#define BPF_JMP_IMM(OP, DST, IMM, OFF) \
316 ((struct bpf_insn) { \
317 .code = BPF_JMP | BPF_OP(OP) | BPF_K, \
318 .dst_reg = DST, \
319 .src_reg = 0, \
320 .off = OFF, \
321 .imm = IMM })
322
323
324
325#define BPF_JMP32_REG(OP, DST, SRC, OFF) \
326 ((struct bpf_insn) { \
327 .code = BPF_JMP32 | BPF_OP(OP) | BPF_X, \
328 .dst_reg = DST, \
329 .src_reg = SRC, \
330 .off = OFF, \
331 .imm = 0 })
332
333
334
335#define BPF_JMP32_IMM(OP, DST, IMM, OFF) \
336 ((struct bpf_insn) { \
337 .code = BPF_JMP32 | BPF_OP(OP) | BPF_K, \
338 .dst_reg = DST, \
339 .src_reg = 0, \
340 .off = OFF, \
341 .imm = IMM })
342
343
344
345#define BPF_JMP_A(OFF) \
346 ((struct bpf_insn) { \
347 .code = BPF_JMP | BPF_JA, \
348 .dst_reg = 0, \
349 .src_reg = 0, \
350 .off = OFF, \
351 .imm = 0 })
352
353
354
355#define BPF_CALL_REL(TGT) \
356 ((struct bpf_insn) { \
357 .code = BPF_JMP | BPF_CALL, \
358 .dst_reg = 0, \
359 .src_reg = BPF_PSEUDO_CALL, \
360 .off = 0, \
361 .imm = TGT })
362
363
364
365#define BPF_CALL_IMM(x) ((void *)(x) - (void *)__bpf_call_base)
366
367#define BPF_EMIT_CALL(FUNC) \
368 ((struct bpf_insn) { \
369 .code = BPF_JMP | BPF_CALL, \
370 .dst_reg = 0, \
371 .src_reg = 0, \
372 .off = 0, \
373 .imm = BPF_CALL_IMM(FUNC) })
374
375
376
377#define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \
378 ((struct bpf_insn) { \
379 .code = CODE, \
380 .dst_reg = DST, \
381 .src_reg = SRC, \
382 .off = OFF, \
383 .imm = IMM })
384
385
386
387#define BPF_EXIT_INSN() \
388 ((struct bpf_insn) { \
389 .code = BPF_JMP | BPF_EXIT, \
390 .dst_reg = 0, \
391 .src_reg = 0, \
392 .off = 0, \
393 .imm = 0 })
394
395
396
397#define BPF_ST_NOSPEC() \
398 ((struct bpf_insn) { \
399 .code = BPF_ST | BPF_NOSPEC, \
400 .dst_reg = 0, \
401 .src_reg = 0, \
402 .off = 0, \
403 .imm = 0 })
404
405
406
407#define __BPF_STMT(CODE, K) \
408 ((struct sock_filter) BPF_STMT(CODE, K))
409
410#define __BPF_JUMP(CODE, K, JT, JF) \
411 ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF))
412
413#define bytes_to_bpf_size(bytes) \
414({ \
415 int bpf_size = -EINVAL; \
416 \
417 if (bytes == sizeof(u8)) \
418 bpf_size = BPF_B; \
419 else if (bytes == sizeof(u16)) \
420 bpf_size = BPF_H; \
421 else if (bytes == sizeof(u32)) \
422 bpf_size = BPF_W; \
423 else if (bytes == sizeof(u64)) \
424 bpf_size = BPF_DW; \
425 \
426 bpf_size; \
427})
428
429#define bpf_size_to_bytes(bpf_size) \
430({ \
431 int bytes = -EINVAL; \
432 \
433 if (bpf_size == BPF_B) \
434 bytes = sizeof(u8); \
435 else if (bpf_size == BPF_H) \
436 bytes = sizeof(u16); \
437 else if (bpf_size == BPF_W) \
438 bytes = sizeof(u32); \
439 else if (bpf_size == BPF_DW) \
440 bytes = sizeof(u64); \
441 \
442 bytes; \
443})
444
445#define BPF_SIZEOF(type) \
446 ({ \
447 const int __size = bytes_to_bpf_size(sizeof(type)); \
448 BUILD_BUG_ON(__size < 0); \
449 __size; \
450 })
451
452#define BPF_FIELD_SIZEOF(type, field) \
453 ({ \
454 const int __size = bytes_to_bpf_size(sizeof_field(type, field)); \
455 BUILD_BUG_ON(__size < 0); \
456 __size; \
457 })
458
459#define BPF_LDST_BYTES(insn) \
460 ({ \
461 const int __size = bpf_size_to_bytes(BPF_SIZE((insn)->code)); \
462 WARN_ON(__size < 0); \
463 __size; \
464 })
465
466#define __BPF_MAP_0(m, v, ...) v
467#define __BPF_MAP_1(m, v, t, a, ...) m(t, a)
468#define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__)
469#define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__)
470#define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__)
471#define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__)
472
473#define __BPF_REG_0(...) __BPF_PAD(5)
474#define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4)
475#define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3)
476#define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2)
477#define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1)
478#define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__)
479
480#define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__)
481#define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__)
482
483#define __BPF_CAST(t, a) \
484 (__force t) \
485 (__force \
486 typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long), \
487 (unsigned long)0, (t)0))) a
488#define __BPF_V void
489#define __BPF_N
490
491#define __BPF_DECL_ARGS(t, a) t a
492#define __BPF_DECL_REGS(t, a) u64 a
493
494#define __BPF_PAD(n) \
495 __BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2, \
496 u64, __ur_3, u64, __ur_4, u64, __ur_5)
497
498#define BPF_CALL_x(x, name, ...) \
499 static __always_inline \
500 u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)); \
501 typedef u64 (*btf_##name)(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)); \
502 u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)); \
503 u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)) \
504 { \
505 return ((btf_##name)____##name)(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\
506 } \
507 static __always_inline \
508 u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__))
509
510#define BPF_CALL_0(name, ...) BPF_CALL_x(0, name, __VA_ARGS__)
511#define BPF_CALL_1(name, ...) BPF_CALL_x(1, name, __VA_ARGS__)
512#define BPF_CALL_2(name, ...) BPF_CALL_x(2, name, __VA_ARGS__)
513#define BPF_CALL_3(name, ...) BPF_CALL_x(3, name, __VA_ARGS__)
514#define BPF_CALL_4(name, ...) BPF_CALL_x(4, name, __VA_ARGS__)
515#define BPF_CALL_5(name, ...) BPF_CALL_x(5, name, __VA_ARGS__)
516
517#define bpf_ctx_range(TYPE, MEMBER) \
518 offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
519#define bpf_ctx_range_till(TYPE, MEMBER1, MEMBER2) \
520 offsetof(TYPE, MEMBER1) ... offsetofend(TYPE, MEMBER2) - 1
521#if BITS_PER_LONG == 64
522# define bpf_ctx_range_ptr(TYPE, MEMBER) \
523 offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
524#else
525# define bpf_ctx_range_ptr(TYPE, MEMBER) \
526 offsetof(TYPE, MEMBER) ... offsetof(TYPE, MEMBER) + 8 - 1
527#endif
528
529#define bpf_target_off(TYPE, MEMBER, SIZE, PTR_SIZE) \
530 ({ \
531 BUILD_BUG_ON(sizeof_field(TYPE, MEMBER) != (SIZE)); \
532 *(PTR_SIZE) = (SIZE); \
533 offsetof(TYPE, MEMBER); \
534 })
535
536
537struct compat_sock_fprog {
538 u16 len;
539 compat_uptr_t filter;
540};
541
542struct sock_fprog_kern {
543 u16 len;
544 struct sock_filter *filter;
545};
546
547
548#define BPF_IMAGE_ALIGNMENT 8
549
550struct bpf_binary_header {
551 u32 size;
552 u8 image[] __aligned(BPF_IMAGE_ALIGNMENT);
553};
554
555struct bpf_prog_stats {
556 u64_stats_t cnt;
557 u64_stats_t nsecs;
558 u64_stats_t misses;
559 struct u64_stats_sync syncp;
560} __aligned(2 * sizeof(u64));
561
562struct bpf_prog {
563 u16 pages;
564 u16 jited:1,
565 jit_requested:1,
566 gpl_compatible:1,
567 cb_access:1,
568 dst_needed:1,
569 blinding_requested:1,
570 blinded:1,
571 is_func:1,
572 kprobe_override:1,
573 has_callchain_buf:1,
574 enforce_expected_attach_type:1,
575 call_get_stack:1,
576 call_get_func_ip:1,
577 tstamp_type_access:1;
578 enum bpf_prog_type type;
579 enum bpf_attach_type expected_attach_type;
580 u32 len;
581 u32 jited_len;
582 u8 tag[BPF_TAG_SIZE];
583 struct bpf_prog_stats __percpu *stats;
584 int __percpu *active;
585 unsigned int (*bpf_func)(const void *ctx,
586 const struct bpf_insn *insn);
587 struct bpf_prog_aux *aux;
588 struct sock_fprog_kern *orig_prog;
589
590 union {
591 DECLARE_FLEX_ARRAY(struct sock_filter, insns);
592 DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);
593 };
594};
595
596struct sk_filter {
597 refcount_t refcnt;
598 struct rcu_head rcu;
599 struct bpf_prog *prog;
600};
601
602DECLARE_STATIC_KEY_FALSE(bpf_stats_enabled_key);
603
604typedef unsigned int (*bpf_dispatcher_fn)(const void *ctx,
605 const struct bpf_insn *insnsi,
606 unsigned int (*bpf_func)(const void *,
607 const struct bpf_insn *));
608
609static __always_inline u32 __bpf_prog_run(const struct bpf_prog *prog,
610 const void *ctx,
611 bpf_dispatcher_fn dfunc)
612{
613 u32 ret;
614
615 cant_migrate();
616 if (static_branch_unlikely(&bpf_stats_enabled_key)) {
617 struct bpf_prog_stats *stats;
618 u64 start = sched_clock();
619 unsigned long flags;
620
621 ret = dfunc(ctx, prog->insnsi, prog->bpf_func);
622 stats = this_cpu_ptr(prog->stats);
623 flags = u64_stats_update_begin_irqsave(&stats->syncp);
624 u64_stats_inc(&stats->cnt);
625 u64_stats_add(&stats->nsecs, sched_clock() - start);
626 u64_stats_update_end_irqrestore(&stats->syncp, flags);
627 } else {
628 ret = dfunc(ctx, prog->insnsi, prog->bpf_func);
629 }
630 return ret;
631}
632
633static __always_inline u32 bpf_prog_run(const struct bpf_prog *prog, const void *ctx)
634{
635 return __bpf_prog_run(prog, ctx, bpf_dispatcher_nop_func);
636}
637
638
639
640
641
642
643
644
645
646static inline u32 bpf_prog_run_pin_on_cpu(const struct bpf_prog *prog,
647 const void *ctx)
648{
649 u32 ret;
650
651 migrate_disable();
652 ret = bpf_prog_run(prog, ctx);
653 migrate_enable();
654 return ret;
655}
656
657#define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN
658
659struct bpf_skb_data_end {
660 struct qdisc_skb_cb qdisc_cb;
661 void *data_meta;
662 void *data_end;
663};
664
665struct bpf_nh_params {
666 u32 nh_family;
667 union {
668 u32 ipv4_nh;
669 struct in6_addr ipv6_nh;
670 };
671};
672
673struct bpf_redirect_info {
674 u32 flags;
675 u32 tgt_index;
676 void *tgt_value;
677 struct bpf_map *map;
678 u32 map_id;
679 enum bpf_map_type map_type;
680 u32 kern_flags;
681 struct bpf_nh_params nh;
682};
683
684DECLARE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info);
685
686
687#define BPF_RI_F_RF_NO_DIRECT BIT(0)
688
689
690
691
692
693
694
695static inline void bpf_compute_data_pointers(struct sk_buff *skb)
696{
697 struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
698
699 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb));
700 cb->data_meta = skb->data - skb_metadata_len(skb);
701 cb->data_end = skb->data + skb_headlen(skb);
702}
703
704
705
706
707static inline void bpf_compute_and_save_data_end(
708 struct sk_buff *skb, void **saved_data_end)
709{
710 struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
711
712 *saved_data_end = cb->data_end;
713 cb->data_end = skb->data + skb_headlen(skb);
714}
715
716
717static inline void bpf_restore_data_end(
718 struct sk_buff *skb, void *saved_data_end)
719{
720 struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
721
722 cb->data_end = saved_data_end;
723}
724
725static inline u8 *bpf_skb_cb(const struct sk_buff *skb)
726{
727
728
729
730
731
732
733
734
735
736
737 BUILD_BUG_ON(sizeof_field(struct __sk_buff, cb) != BPF_SKB_CB_LEN);
738 BUILD_BUG_ON(sizeof_field(struct __sk_buff, cb) !=
739 sizeof_field(struct qdisc_skb_cb, data));
740
741 return qdisc_skb_cb(skb)->data;
742}
743
744
745static inline u32 __bpf_prog_run_save_cb(const struct bpf_prog *prog,
746 const void *ctx)
747{
748 const struct sk_buff *skb = ctx;
749 u8 *cb_data = bpf_skb_cb(skb);
750 u8 cb_saved[BPF_SKB_CB_LEN];
751 u32 res;
752
753 if (unlikely(prog->cb_access)) {
754 memcpy(cb_saved, cb_data, sizeof(cb_saved));
755 memset(cb_data, 0, sizeof(cb_saved));
756 }
757
758 res = bpf_prog_run(prog, skb);
759
760 if (unlikely(prog->cb_access))
761 memcpy(cb_data, cb_saved, sizeof(cb_saved));
762
763 return res;
764}
765
766static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
767 struct sk_buff *skb)
768{
769 u32 res;
770
771 migrate_disable();
772 res = __bpf_prog_run_save_cb(prog, skb);
773 migrate_enable();
774 return res;
775}
776
777static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog,
778 struct sk_buff *skb)
779{
780 u8 *cb_data = bpf_skb_cb(skb);
781 u32 res;
782
783 if (unlikely(prog->cb_access))
784 memset(cb_data, 0, BPF_SKB_CB_LEN);
785
786 res = bpf_prog_run_pin_on_cpu(prog, skb);
787 return res;
788}
789
790DECLARE_BPF_DISPATCHER(xdp)
791
792DECLARE_STATIC_KEY_FALSE(bpf_master_redirect_enabled_key);
793
794u32 xdp_master_redirect(struct xdp_buff *xdp);
795
796static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
797 struct xdp_buff *xdp)
798{
799
800
801
802
803 u32 act = __bpf_prog_run(prog, xdp, BPF_DISPATCHER_FUNC(xdp));
804
805 if (static_branch_unlikely(&bpf_master_redirect_enabled_key)) {
806 if (act == XDP_TX && netif_is_bond_slave(xdp->rxq->dev))
807 act = xdp_master_redirect(xdp);
808 }
809
810 return act;
811}
812
813void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog);
814
815static inline u32 bpf_prog_insn_size(const struct bpf_prog *prog)
816{
817 return prog->len * sizeof(struct bpf_insn);
818}
819
820static inline u32 bpf_prog_tag_scratch_size(const struct bpf_prog *prog)
821{
822 return round_up(bpf_prog_insn_size(prog) +
823 sizeof(__be64) + 1, SHA1_BLOCK_SIZE);
824}
825
826static inline unsigned int bpf_prog_size(unsigned int proglen)
827{
828 return max(sizeof(struct bpf_prog),
829 offsetof(struct bpf_prog, insns[proglen]));
830}
831
832static inline bool bpf_prog_was_classic(const struct bpf_prog *prog)
833{
834
835
836
837
838
839 return prog->type == BPF_PROG_TYPE_UNSPEC;
840}
841
842static inline u32 bpf_ctx_off_adjust_machine(u32 size)
843{
844 const u32 size_machine = sizeof(unsigned long);
845
846 if (size > size_machine && size % size_machine == 0)
847 size = size_machine;
848
849 return size;
850}
851
852static inline bool
853bpf_ctx_narrow_access_ok(u32 off, u32 size, u32 size_default)
854{
855 return size <= size_default && (size & (size - 1)) == 0;
856}
857
858static inline u8
859bpf_ctx_narrow_access_offset(u32 off, u32 size, u32 size_default)
860{
861 u8 access_off = off & (size_default - 1);
862
863#ifdef __LITTLE_ENDIAN
864 return access_off;
865#else
866 return size_default - (access_off + size);
867#endif
868}
869
870#define bpf_ctx_wide_access_ok(off, size, type, field) \
871 (size == sizeof(__u64) && \
872 off >= offsetof(type, field) && \
873 off + sizeof(__u64) <= offsetofend(type, field) && \
874 off % sizeof(__u64) == 0)
875
876#define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
877
878static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
879{
880#ifndef CONFIG_BPF_JIT_ALWAYS_ON
881 if (!fp->jited) {
882 set_vm_flush_reset_perms(fp);
883 set_memory_ro((unsigned long)fp, fp->pages);
884 }
885#endif
886}
887
888static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr)
889{
890 set_vm_flush_reset_perms(hdr);
891 set_memory_ro((unsigned long)hdr, hdr->size >> PAGE_SHIFT);
892 set_memory_x((unsigned long)hdr, hdr->size >> PAGE_SHIFT);
893}
894
895int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap);
896static inline int sk_filter(struct sock *sk, struct sk_buff *skb)
897{
898 return sk_filter_trim_cap(sk, skb, 1);
899}
900
901struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err);
902void bpf_prog_free(struct bpf_prog *fp);
903
904bool bpf_opcode_in_insntable(u8 code);
905
906void bpf_prog_free_linfo(struct bpf_prog *prog);
907void bpf_prog_fill_jited_linfo(struct bpf_prog *prog,
908 const u32 *insn_to_jit_off);
909int bpf_prog_alloc_jited_linfo(struct bpf_prog *prog);
910void bpf_prog_jit_attempt_done(struct bpf_prog *prog);
911
912struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags);
913struct bpf_prog *bpf_prog_alloc_no_stats(unsigned int size, gfp_t gfp_extra_flags);
914struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
915 gfp_t gfp_extra_flags);
916void __bpf_prog_free(struct bpf_prog *fp);
917
918static inline void bpf_prog_unlock_free(struct bpf_prog *fp)
919{
920 __bpf_prog_free(fp);
921}
922
923typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter,
924 unsigned int flen);
925
926int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog);
927int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
928 bpf_aux_classic_check_t trans, bool save_orig);
929void bpf_prog_destroy(struct bpf_prog *fp);
930
931int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
932int sk_attach_bpf(u32 ufd, struct sock *sk);
933int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk);
934int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk);
935void sk_reuseport_prog_free(struct bpf_prog *prog);
936int sk_detach_filter(struct sock *sk);
937int sk_get_filter(struct sock *sk, struct sock_filter __user *filter,
938 unsigned int len);
939
940bool sk_filter_charge(struct sock *sk, struct sk_filter *fp);
941void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);
942
943u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
944#define __bpf_call_base_args \
945 ((u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)) \
946 (void *)__bpf_call_base)
947
948struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
949void bpf_jit_compile(struct bpf_prog *prog);
950bool bpf_jit_needs_zext(void);
951bool bpf_jit_supports_kfunc_call(void);
952bool bpf_helper_changes_pkt_data(void *func);
953
954static inline bool bpf_dump_raw_ok(const struct cred *cred)
955{
956
957
958
959 return kallsyms_show_value(cred);
960}
961
962struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
963 const struct bpf_insn *patch, u32 len);
964int bpf_remove_insns(struct bpf_prog *prog, u32 off, u32 cnt);
965
966void bpf_clear_redirect_map(struct bpf_map *map);
967
968static inline bool xdp_return_frame_no_direct(void)
969{
970 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
971
972 return ri->kern_flags & BPF_RI_F_RF_NO_DIRECT;
973}
974
975static inline void xdp_set_return_frame_no_direct(void)
976{
977 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
978
979 ri->kern_flags |= BPF_RI_F_RF_NO_DIRECT;
980}
981
982static inline void xdp_clear_return_frame_no_direct(void)
983{
984 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
985
986 ri->kern_flags &= ~BPF_RI_F_RF_NO_DIRECT;
987}
988
989static inline int xdp_ok_fwd_dev(const struct net_device *fwd,
990 unsigned int pktlen)
991{
992 unsigned int len;
993
994 if (unlikely(!(fwd->flags & IFF_UP)))
995 return -ENETDOWN;
996
997 len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN;
998 if (pktlen > len)
999 return -EMSGSIZE;
1000
1001 return 0;
1002}
1003
1004
1005
1006
1007
1008
1009
1010int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
1011 struct xdp_buff *xdp, struct bpf_prog *prog);
1012int xdp_do_redirect(struct net_device *dev,
1013 struct xdp_buff *xdp,
1014 struct bpf_prog *prog);
1015int xdp_do_redirect_frame(struct net_device *dev,
1016 struct xdp_buff *xdp,
1017 struct xdp_frame *xdpf,
1018 struct bpf_prog *prog);
1019void xdp_do_flush(void);
1020
1021
1022
1023
1024
1025#define xdp_do_flush_map xdp_do_flush
1026
1027void bpf_warn_invalid_xdp_action(struct net_device *dev, struct bpf_prog *prog, u32 act);
1028
1029#ifdef CONFIG_INET
1030struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
1031 struct bpf_prog *prog, struct sk_buff *skb,
1032 struct sock *migrating_sk,
1033 u32 hash);
1034#else
1035static inline struct sock *
1036bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
1037 struct bpf_prog *prog, struct sk_buff *skb,
1038 struct sock *migrating_sk,
1039 u32 hash)
1040{
1041 return NULL;
1042}
1043#endif
1044
1045#ifdef CONFIG_BPF_JIT
1046extern int bpf_jit_enable;
1047extern int bpf_jit_harden;
1048extern int bpf_jit_kallsyms;
1049extern long bpf_jit_limit;
1050extern long bpf_jit_limit_max;
1051
1052typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size);
1053
1054struct bpf_binary_header *
1055bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
1056 unsigned int alignment,
1057 bpf_jit_fill_hole_t bpf_fill_ill_insns);
1058void bpf_jit_binary_free(struct bpf_binary_header *hdr);
1059u64 bpf_jit_alloc_exec_limit(void);
1060void *bpf_jit_alloc_exec(unsigned long size);
1061void bpf_jit_free_exec(void *addr);
1062void bpf_jit_free(struct bpf_prog *fp);
1063
1064struct bpf_binary_header *
1065bpf_jit_binary_pack_alloc(unsigned int proglen, u8 **ro_image,
1066 unsigned int alignment,
1067 struct bpf_binary_header **rw_hdr,
1068 u8 **rw_image,
1069 bpf_jit_fill_hole_t bpf_fill_ill_insns);
1070int bpf_jit_binary_pack_finalize(struct bpf_prog *prog,
1071 struct bpf_binary_header *ro_header,
1072 struct bpf_binary_header *rw_header);
1073void bpf_jit_binary_pack_free(struct bpf_binary_header *ro_header,
1074 struct bpf_binary_header *rw_header);
1075
1076int bpf_jit_add_poke_descriptor(struct bpf_prog *prog,
1077 struct bpf_jit_poke_descriptor *poke);
1078
1079int bpf_jit_get_func_addr(const struct bpf_prog *prog,
1080 const struct bpf_insn *insn, bool extra_pass,
1081 u64 *func_addr, bool *func_addr_fixed);
1082
1083struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp);
1084void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other);
1085
1086static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
1087 u32 pass, void *image)
1088{
1089 pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen,
1090 proglen, pass, image, current->comm, task_pid_nr(current));
1091
1092 if (image)
1093 print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
1094 16, 1, image, proglen, false);
1095}
1096
1097static inline bool bpf_jit_is_ebpf(void)
1098{
1099# ifdef CONFIG_HAVE_EBPF_JIT
1100 return true;
1101# else
1102 return false;
1103# endif
1104}
1105
1106static inline bool ebpf_jit_enabled(void)
1107{
1108 return bpf_jit_enable && bpf_jit_is_ebpf();
1109}
1110
1111static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
1112{
1113 return fp->jited && bpf_jit_is_ebpf();
1114}
1115
1116static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
1117{
1118
1119
1120
1121
1122 if (!bpf_jit_is_ebpf())
1123 return false;
1124 if (!prog->jit_requested)
1125 return false;
1126 if (!bpf_jit_harden)
1127 return false;
1128 if (bpf_jit_harden == 1 && capable(CAP_SYS_ADMIN))
1129 return false;
1130
1131 return true;
1132}
1133
1134static inline bool bpf_jit_kallsyms_enabled(void)
1135{
1136
1137
1138
1139 if (bpf_jit_harden)
1140 return false;
1141 if (!bpf_jit_kallsyms)
1142 return false;
1143 if (bpf_jit_kallsyms == 1)
1144 return true;
1145
1146 return false;
1147}
1148
1149const char *__bpf_address_lookup(unsigned long addr, unsigned long *size,
1150 unsigned long *off, char *sym);
1151bool is_bpf_text_address(unsigned long addr);
1152int bpf_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
1153 char *sym);
1154
1155static inline const char *
1156bpf_address_lookup(unsigned long addr, unsigned long *size,
1157 unsigned long *off, char **modname, char *sym)
1158{
1159 const char *ret = __bpf_address_lookup(addr, size, off, sym);
1160
1161 if (ret && modname)
1162 *modname = NULL;
1163 return ret;
1164}
1165
1166void bpf_prog_kallsyms_add(struct bpf_prog *fp);
1167void bpf_prog_kallsyms_del(struct bpf_prog *fp);
1168
1169#else
1170
1171static inline bool ebpf_jit_enabled(void)
1172{
1173 return false;
1174}
1175
1176static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
1177{
1178 return false;
1179}
1180
1181static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
1182{
1183 return false;
1184}
1185
1186static inline int
1187bpf_jit_add_poke_descriptor(struct bpf_prog *prog,
1188 struct bpf_jit_poke_descriptor *poke)
1189{
1190 return -ENOTSUPP;
1191}
1192
1193static inline void bpf_jit_free(struct bpf_prog *fp)
1194{
1195 bpf_prog_unlock_free(fp);
1196}
1197
1198static inline bool bpf_jit_kallsyms_enabled(void)
1199{
1200 return false;
1201}
1202
1203static inline const char *
1204__bpf_address_lookup(unsigned long addr, unsigned long *size,
1205 unsigned long *off, char *sym)
1206{
1207 return NULL;
1208}
1209
1210static inline bool is_bpf_text_address(unsigned long addr)
1211{
1212 return false;
1213}
1214
1215static inline int bpf_get_kallsym(unsigned int symnum, unsigned long *value,
1216 char *type, char *sym)
1217{
1218 return -ERANGE;
1219}
1220
1221static inline const char *
1222bpf_address_lookup(unsigned long addr, unsigned long *size,
1223 unsigned long *off, char **modname, char *sym)
1224{
1225 return NULL;
1226}
1227
1228static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp)
1229{
1230}
1231
1232static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp)
1233{
1234}
1235
1236#endif
1237
1238void bpf_prog_kallsyms_del_all(struct bpf_prog *fp);
1239
1240#define BPF_ANC BIT(15)
1241
1242static inline bool bpf_needs_clear_a(const struct sock_filter *first)
1243{
1244 switch (first->code) {
1245 case BPF_RET | BPF_K:
1246 case BPF_LD | BPF_W | BPF_LEN:
1247 return false;
1248
1249 case BPF_LD | BPF_W | BPF_ABS:
1250 case BPF_LD | BPF_H | BPF_ABS:
1251 case BPF_LD | BPF_B | BPF_ABS:
1252 if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X)
1253 return true;
1254 return false;
1255
1256 default:
1257 return true;
1258 }
1259}
1260
1261static inline u16 bpf_anc_helper(const struct sock_filter *ftest)
1262{
1263 BUG_ON(ftest->code & BPF_ANC);
1264
1265 switch (ftest->code) {
1266 case BPF_LD | BPF_W | BPF_ABS:
1267 case BPF_LD | BPF_H | BPF_ABS:
1268 case BPF_LD | BPF_B | BPF_ABS:
1269#define BPF_ANCILLARY(CODE) case SKF_AD_OFF + SKF_AD_##CODE: \
1270 return BPF_ANC | SKF_AD_##CODE
1271 switch (ftest->k) {
1272 BPF_ANCILLARY(PROTOCOL);
1273 BPF_ANCILLARY(PKTTYPE);
1274 BPF_ANCILLARY(IFINDEX);
1275 BPF_ANCILLARY(NLATTR);
1276 BPF_ANCILLARY(NLATTR_NEST);
1277 BPF_ANCILLARY(MARK);
1278 BPF_ANCILLARY(QUEUE);
1279 BPF_ANCILLARY(HATYPE);
1280 BPF_ANCILLARY(RXHASH);
1281 BPF_ANCILLARY(CPU);
1282 BPF_ANCILLARY(ALU_XOR_X);
1283 BPF_ANCILLARY(VLAN_TAG);
1284 BPF_ANCILLARY(VLAN_TAG_PRESENT);
1285 BPF_ANCILLARY(PAY_OFFSET);
1286 BPF_ANCILLARY(RANDOM);
1287 BPF_ANCILLARY(VLAN_TPID);
1288 }
1289 fallthrough;
1290 default:
1291 return ftest->code;
1292 }
1293}
1294
1295void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb,
1296 int k, unsigned int size);
1297
1298static inline int bpf_tell_extensions(void)
1299{
1300 return SKF_AD_MAX;
1301}
1302
1303struct bpf_sock_addr_kern {
1304 struct sock *sk;
1305 struct sockaddr *uaddr;
1306
1307
1308
1309
1310 u64 tmp_reg;
1311 void *t_ctx;
1312};
1313
1314struct bpf_sock_ops_kern {
1315 struct sock *sk;
1316 union {
1317 u32 args[4];
1318 u32 reply;
1319 u32 replylong[4];
1320 };
1321 struct sk_buff *syn_skb;
1322 struct sk_buff *skb;
1323 void *skb_data_end;
1324 u8 op;
1325 u8 is_fullsock;
1326 u8 remaining_opt_len;
1327 u64 temp;
1328
1329
1330
1331
1332
1333
1334
1335
1336};
1337
1338struct bpf_sysctl_kern {
1339 struct ctl_table_header *head;
1340 struct ctl_table *table;
1341 void *cur_val;
1342 size_t cur_len;
1343 void *new_val;
1344 size_t new_len;
1345 int new_updated;
1346 int write;
1347 loff_t *ppos;
1348
1349 u64 tmp_reg;
1350};
1351
1352#define BPF_SOCKOPT_KERN_BUF_SIZE 32
1353struct bpf_sockopt_buf {
1354 u8 data[BPF_SOCKOPT_KERN_BUF_SIZE];
1355};
1356
1357struct bpf_sockopt_kern {
1358 struct sock *sk;
1359 u8 *optval;
1360 u8 *optval_end;
1361 s32 level;
1362 s32 optname;
1363 s32 optlen;
1364
1365 struct task_struct *current_task;
1366
1367 u64 tmp_reg;
1368};
1369
1370int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len);
1371
1372struct bpf_sk_lookup_kern {
1373 u16 family;
1374 u16 protocol;
1375 __be16 sport;
1376 u16 dport;
1377 struct {
1378 __be32 saddr;
1379 __be32 daddr;
1380 } v4;
1381 struct {
1382 const struct in6_addr *saddr;
1383 const struct in6_addr *daddr;
1384 } v6;
1385 struct sock *selected_sk;
1386 u32 ingress_ifindex;
1387 bool no_reuseport;
1388};
1389
1390extern struct static_key_false bpf_sk_lookup_enabled;
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413#define BPF_PROG_SK_LOOKUP_RUN_ARRAY(array, ctx, func) \
1414 ({ \
1415 struct bpf_sk_lookup_kern *_ctx = &(ctx); \
1416 struct bpf_prog_array_item *_item; \
1417 struct sock *_selected_sk = NULL; \
1418 bool _no_reuseport = false; \
1419 struct bpf_prog *_prog; \
1420 bool _all_pass = true; \
1421 u32 _ret; \
1422 \
1423 migrate_disable(); \
1424 _item = &(array)->items[0]; \
1425 while ((_prog = READ_ONCE(_item->prog))) { \
1426 \
1427 _ctx->selected_sk = _selected_sk; \
1428 _ctx->no_reuseport = _no_reuseport; \
1429 \
1430 _ret = func(_prog, _ctx); \
1431 if (_ret == SK_PASS && _ctx->selected_sk) { \
1432 \
1433 _selected_sk = _ctx->selected_sk; \
1434 _no_reuseport = _ctx->no_reuseport; \
1435 } else if (_ret == SK_DROP && _all_pass) { \
1436 _all_pass = false; \
1437 } \
1438 _item++; \
1439 } \
1440 _ctx->selected_sk = _selected_sk; \
1441 _ctx->no_reuseport = _no_reuseport; \
1442 migrate_enable(); \
1443 _all_pass || _selected_sk ? SK_PASS : SK_DROP; \
1444 })
1445
1446static inline bool bpf_sk_lookup_run_v4(struct net *net, int protocol,
1447 const __be32 saddr, const __be16 sport,
1448 const __be32 daddr, const u16 dport,
1449 const int ifindex, struct sock **psk)
1450{
1451 struct bpf_prog_array *run_array;
1452 struct sock *selected_sk = NULL;
1453 bool no_reuseport = false;
1454
1455 rcu_read_lock();
1456 run_array = rcu_dereference(net->bpf.run_array[NETNS_BPF_SK_LOOKUP]);
1457 if (run_array) {
1458 struct bpf_sk_lookup_kern ctx = {
1459 .family = AF_INET,
1460 .protocol = protocol,
1461 .v4.saddr = saddr,
1462 .v4.daddr = daddr,
1463 .sport = sport,
1464 .dport = dport,
1465 .ingress_ifindex = ifindex,
1466 };
1467 u32 act;
1468
1469 act = BPF_PROG_SK_LOOKUP_RUN_ARRAY(run_array, ctx, bpf_prog_run);
1470 if (act == SK_PASS) {
1471 selected_sk = ctx.selected_sk;
1472 no_reuseport = ctx.no_reuseport;
1473 } else {
1474 selected_sk = ERR_PTR(-ECONNREFUSED);
1475 }
1476 }
1477 rcu_read_unlock();
1478 *psk = selected_sk;
1479 return no_reuseport;
1480}
1481
1482#if IS_ENABLED(CONFIG_IPV6)
1483static inline bool bpf_sk_lookup_run_v6(struct net *net, int protocol,
1484 const struct in6_addr *saddr,
1485 const __be16 sport,
1486 const struct in6_addr *daddr,
1487 const u16 dport,
1488 const int ifindex, struct sock **psk)
1489{
1490 struct bpf_prog_array *run_array;
1491 struct sock *selected_sk = NULL;
1492 bool no_reuseport = false;
1493
1494 rcu_read_lock();
1495 run_array = rcu_dereference(net->bpf.run_array[NETNS_BPF_SK_LOOKUP]);
1496 if (run_array) {
1497 struct bpf_sk_lookup_kern ctx = {
1498 .family = AF_INET6,
1499 .protocol = protocol,
1500 .v6.saddr = saddr,
1501 .v6.daddr = daddr,
1502 .sport = sport,
1503 .dport = dport,
1504 .ingress_ifindex = ifindex,
1505 };
1506 u32 act;
1507
1508 act = BPF_PROG_SK_LOOKUP_RUN_ARRAY(run_array, ctx, bpf_prog_run);
1509 if (act == SK_PASS) {
1510 selected_sk = ctx.selected_sk;
1511 no_reuseport = ctx.no_reuseport;
1512 } else {
1513 selected_sk = ERR_PTR(-ECONNREFUSED);
1514 }
1515 }
1516 rcu_read_unlock();
1517 *psk = selected_sk;
1518 return no_reuseport;
1519}
1520#endif
1521
1522static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u32 ifindex,
1523 u64 flags, const u64 flag_mask,
1524 void *lookup_elem(struct bpf_map *map, u32 key))
1525{
1526 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
1527 const u64 action_mask = XDP_ABORTED | XDP_DROP | XDP_PASS | XDP_TX;
1528
1529
1530 if (unlikely(flags & ~(action_mask | flag_mask)))
1531 return XDP_ABORTED;
1532
1533 ri->tgt_value = lookup_elem(map, ifindex);
1534 if (unlikely(!ri->tgt_value) && !(flags & BPF_F_BROADCAST)) {
1535
1536
1537
1538
1539
1540 ri->map_id = INT_MAX;
1541 ri->map_type = BPF_MAP_TYPE_UNSPEC;
1542 return flags & action_mask;
1543 }
1544
1545 ri->tgt_index = ifindex;
1546 ri->map_id = map->id;
1547 ri->map_type = map->map_type;
1548
1549 if (flags & BPF_F_BROADCAST) {
1550 WRITE_ONCE(ri->map, map);
1551 ri->flags = flags;
1552 } else {
1553 WRITE_ONCE(ri->map, NULL);
1554 ri->flags = 0;
1555 }
1556
1557 return XDP_REDIRECT;
1558}
1559
1560#endif
1561