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
23#include <net/sch_generic.h>
24
25#include <uapi/linux/filter.h>
26#include <uapi/linux/bpf.h>
27
28struct sk_buff;
29struct sock;
30struct seccomp_data;
31struct bpf_prog_aux;
32struct xdp_rxq_info;
33
34
35
36
37
38#define BPF_REG_ARG1 BPF_REG_1
39#define BPF_REG_ARG2 BPF_REG_2
40#define BPF_REG_ARG3 BPF_REG_3
41#define BPF_REG_ARG4 BPF_REG_4
42#define BPF_REG_ARG5 BPF_REG_5
43#define BPF_REG_CTX BPF_REG_6
44#define BPF_REG_FP BPF_REG_10
45
46
47#define BPF_REG_A BPF_REG_0
48#define BPF_REG_X BPF_REG_7
49#define BPF_REG_TMP BPF_REG_8
50
51
52
53
54
55
56
57#define BPF_REG_AX MAX_BPF_REG
58#define MAX_BPF_JIT_REG (MAX_BPF_REG + 1)
59
60
61#define BPF_TAIL_CALL 0xf0
62
63
64#define BPF_CALL_ARGS 0xe0
65
66
67
68
69
70#define BPF_SYM_ELF_TYPE 't'
71
72
73#define MAX_BPF_STACK 512
74
75
76
77
78
79#define BPF_ALU64_REG(OP, DST, SRC) \
80 ((struct bpf_insn) { \
81 .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \
82 .dst_reg = DST, \
83 .src_reg = SRC, \
84 .off = 0, \
85 .imm = 0 })
86
87#define BPF_ALU32_REG(OP, DST, SRC) \
88 ((struct bpf_insn) { \
89 .code = BPF_ALU | BPF_OP(OP) | BPF_X, \
90 .dst_reg = DST, \
91 .src_reg = SRC, \
92 .off = 0, \
93 .imm = 0 })
94
95
96
97#define BPF_ALU64_IMM(OP, DST, IMM) \
98 ((struct bpf_insn) { \
99 .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \
100 .dst_reg = DST, \
101 .src_reg = 0, \
102 .off = 0, \
103 .imm = IMM })
104
105#define BPF_ALU32_IMM(OP, DST, IMM) \
106 ((struct bpf_insn) { \
107 .code = BPF_ALU | BPF_OP(OP) | BPF_K, \
108 .dst_reg = DST, \
109 .src_reg = 0, \
110 .off = 0, \
111 .imm = IMM })
112
113
114
115#define BPF_ENDIAN(TYPE, DST, LEN) \
116 ((struct bpf_insn) { \
117 .code = BPF_ALU | BPF_END | BPF_SRC(TYPE), \
118 .dst_reg = DST, \
119 .src_reg = 0, \
120 .off = 0, \
121 .imm = LEN })
122
123
124
125#define BPF_MOV64_REG(DST, SRC) \
126 ((struct bpf_insn) { \
127 .code = BPF_ALU64 | BPF_MOV | BPF_X, \
128 .dst_reg = DST, \
129 .src_reg = SRC, \
130 .off = 0, \
131 .imm = 0 })
132
133#define BPF_MOV32_REG(DST, SRC) \
134 ((struct bpf_insn) { \
135 .code = BPF_ALU | BPF_MOV | BPF_X, \
136 .dst_reg = DST, \
137 .src_reg = SRC, \
138 .off = 0, \
139 .imm = 0 })
140
141
142
143#define BPF_MOV64_IMM(DST, IMM) \
144 ((struct bpf_insn) { \
145 .code = BPF_ALU64 | BPF_MOV | BPF_K, \
146 .dst_reg = DST, \
147 .src_reg = 0, \
148 .off = 0, \
149 .imm = IMM })
150
151#define BPF_MOV32_IMM(DST, IMM) \
152 ((struct bpf_insn) { \
153 .code = BPF_ALU | BPF_MOV | BPF_K, \
154 .dst_reg = DST, \
155 .src_reg = 0, \
156 .off = 0, \
157 .imm = IMM })
158
159
160#define BPF_LD_IMM64(DST, IMM) \
161 BPF_LD_IMM64_RAW(DST, 0, IMM)
162
163#define BPF_LD_IMM64_RAW(DST, SRC, IMM) \
164 ((struct bpf_insn) { \
165 .code = BPF_LD | BPF_DW | BPF_IMM, \
166 .dst_reg = DST, \
167 .src_reg = SRC, \
168 .off = 0, \
169 .imm = (__u32) (IMM) }), \
170 ((struct bpf_insn) { \
171 .code = 0, \
172 .dst_reg = 0, \
173 .src_reg = 0, \
174 .off = 0, \
175 .imm = ((__u64) (IMM)) >> 32 })
176
177
178#define BPF_LD_MAP_FD(DST, MAP_FD) \
179 BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
180
181
182
183#define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \
184 ((struct bpf_insn) { \
185 .code = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE), \
186 .dst_reg = DST, \
187 .src_reg = SRC, \
188 .off = 0, \
189 .imm = IMM })
190
191#define BPF_MOV32_RAW(TYPE, DST, SRC, IMM) \
192 ((struct bpf_insn) { \
193 .code = BPF_ALU | BPF_MOV | BPF_SRC(TYPE), \
194 .dst_reg = DST, \
195 .src_reg = SRC, \
196 .off = 0, \
197 .imm = IMM })
198
199
200
201#define BPF_LD_ABS(SIZE, IMM) \
202 ((struct bpf_insn) { \
203 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \
204 .dst_reg = 0, \
205 .src_reg = 0, \
206 .off = 0, \
207 .imm = IMM })
208
209
210
211#define BPF_LD_IND(SIZE, SRC, IMM) \
212 ((struct bpf_insn) { \
213 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_IND, \
214 .dst_reg = 0, \
215 .src_reg = SRC, \
216 .off = 0, \
217 .imm = IMM })
218
219
220
221#define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \
222 ((struct bpf_insn) { \
223 .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \
224 .dst_reg = DST, \
225 .src_reg = SRC, \
226 .off = OFF, \
227 .imm = 0 })
228
229
230
231#define BPF_STX_MEM(SIZE, DST, SRC, OFF) \
232 ((struct bpf_insn) { \
233 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \
234 .dst_reg = DST, \
235 .src_reg = SRC, \
236 .off = OFF, \
237 .imm = 0 })
238
239
240
241#define BPF_STX_XADD(SIZE, DST, SRC, OFF) \
242 ((struct bpf_insn) { \
243 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD, \
244 .dst_reg = DST, \
245 .src_reg = SRC, \
246 .off = OFF, \
247 .imm = 0 })
248
249
250
251#define BPF_ST_MEM(SIZE, DST, OFF, IMM) \
252 ((struct bpf_insn) { \
253 .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \
254 .dst_reg = DST, \
255 .src_reg = 0, \
256 .off = OFF, \
257 .imm = IMM })
258
259
260
261#define BPF_JMP_REG(OP, DST, SRC, OFF) \
262 ((struct bpf_insn) { \
263 .code = BPF_JMP | BPF_OP(OP) | BPF_X, \
264 .dst_reg = DST, \
265 .src_reg = SRC, \
266 .off = OFF, \
267 .imm = 0 })
268
269
270
271#define BPF_JMP_IMM(OP, DST, IMM, OFF) \
272 ((struct bpf_insn) { \
273 .code = BPF_JMP | BPF_OP(OP) | BPF_K, \
274 .dst_reg = DST, \
275 .src_reg = 0, \
276 .off = OFF, \
277 .imm = IMM })
278
279
280
281#define BPF_JMP_A(OFF) \
282 ((struct bpf_insn) { \
283 .code = BPF_JMP | BPF_JA, \
284 .dst_reg = 0, \
285 .src_reg = 0, \
286 .off = OFF, \
287 .imm = 0 })
288
289
290
291#define BPF_EMIT_CALL(FUNC) \
292 ((struct bpf_insn) { \
293 .code = BPF_JMP | BPF_CALL, \
294 .dst_reg = 0, \
295 .src_reg = 0, \
296 .off = 0, \
297 .imm = ((FUNC) - __bpf_call_base) })
298
299
300
301#define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \
302 ((struct bpf_insn) { \
303 .code = CODE, \
304 .dst_reg = DST, \
305 .src_reg = SRC, \
306 .off = OFF, \
307 .imm = IMM })
308
309
310
311#define BPF_EXIT_INSN() \
312 ((struct bpf_insn) { \
313 .code = BPF_JMP | BPF_EXIT, \
314 .dst_reg = 0, \
315 .src_reg = 0, \
316 .off = 0, \
317 .imm = 0 })
318
319
320
321#define __BPF_STMT(CODE, K) \
322 ((struct sock_filter) BPF_STMT(CODE, K))
323
324#define __BPF_JUMP(CODE, K, JT, JF) \
325 ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF))
326
327#define bytes_to_bpf_size(bytes) \
328({ \
329 int bpf_size = -EINVAL; \
330 \
331 if (bytes == sizeof(u8)) \
332 bpf_size = BPF_B; \
333 else if (bytes == sizeof(u16)) \
334 bpf_size = BPF_H; \
335 else if (bytes == sizeof(u32)) \
336 bpf_size = BPF_W; \
337 else if (bytes == sizeof(u64)) \
338 bpf_size = BPF_DW; \
339 \
340 bpf_size; \
341})
342
343#define bpf_size_to_bytes(bpf_size) \
344({ \
345 int bytes = -EINVAL; \
346 \
347 if (bpf_size == BPF_B) \
348 bytes = sizeof(u8); \
349 else if (bpf_size == BPF_H) \
350 bytes = sizeof(u16); \
351 else if (bpf_size == BPF_W) \
352 bytes = sizeof(u32); \
353 else if (bpf_size == BPF_DW) \
354 bytes = sizeof(u64); \
355 \
356 bytes; \
357})
358
359#define BPF_SIZEOF(type) \
360 ({ \
361 const int __size = bytes_to_bpf_size(sizeof(type)); \
362 BUILD_BUG_ON(__size < 0); \
363 __size; \
364 })
365
366#define BPF_FIELD_SIZEOF(type, field) \
367 ({ \
368 const int __size = bytes_to_bpf_size(FIELD_SIZEOF(type, field)); \
369 BUILD_BUG_ON(__size < 0); \
370 __size; \
371 })
372
373#define BPF_LDST_BYTES(insn) \
374 ({ \
375 const int __size = bpf_size_to_bytes(BPF_SIZE((insn)->code)); \
376 WARN_ON(__size < 0); \
377 __size; \
378 })
379
380#define __BPF_MAP_0(m, v, ...) v
381#define __BPF_MAP_1(m, v, t, a, ...) m(t, a)
382#define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__)
383#define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__)
384#define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__)
385#define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__)
386
387#define __BPF_REG_0(...) __BPF_PAD(5)
388#define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4)
389#define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3)
390#define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2)
391#define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1)
392#define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__)
393
394#define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__)
395#define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__)
396
397#define __BPF_CAST(t, a) \
398 (__force t) \
399 (__force \
400 typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long), \
401 (unsigned long)0, (t)0))) a
402#define __BPF_V void
403#define __BPF_N
404
405#define __BPF_DECL_ARGS(t, a) t a
406#define __BPF_DECL_REGS(t, a) u64 a
407
408#define __BPF_PAD(n) \
409 __BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2, \
410 u64, __ur_3, u64, __ur_4, u64, __ur_5)
411
412#define BPF_CALL_x(x, name, ...) \
413 static __always_inline \
414 u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)); \
415 u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)); \
416 u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)) \
417 { \
418 return ____##name(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\
419 } \
420 static __always_inline \
421 u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__))
422
423#define BPF_CALL_0(name, ...) BPF_CALL_x(0, name, __VA_ARGS__)
424#define BPF_CALL_1(name, ...) BPF_CALL_x(1, name, __VA_ARGS__)
425#define BPF_CALL_2(name, ...) BPF_CALL_x(2, name, __VA_ARGS__)
426#define BPF_CALL_3(name, ...) BPF_CALL_x(3, name, __VA_ARGS__)
427#define BPF_CALL_4(name, ...) BPF_CALL_x(4, name, __VA_ARGS__)
428#define BPF_CALL_5(name, ...) BPF_CALL_x(5, name, __VA_ARGS__)
429
430#define bpf_ctx_range(TYPE, MEMBER) \
431 offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
432#define bpf_ctx_range_till(TYPE, MEMBER1, MEMBER2) \
433 offsetof(TYPE, MEMBER1) ... offsetofend(TYPE, MEMBER2) - 1
434
435#define bpf_target_off(TYPE, MEMBER, SIZE, PTR_SIZE) \
436 ({ \
437 BUILD_BUG_ON(FIELD_SIZEOF(TYPE, MEMBER) != (SIZE)); \
438 *(PTR_SIZE) = (SIZE); \
439 offsetof(TYPE, MEMBER); \
440 })
441
442#ifdef CONFIG_COMPAT
443
444struct compat_sock_fprog {
445 u16 len;
446 compat_uptr_t filter;
447};
448#endif
449
450struct sock_fprog_kern {
451 u16 len;
452 struct sock_filter *filter;
453};
454
455struct bpf_binary_header {
456 unsigned int pages;
457 u8 image[];
458};
459
460struct bpf_prog {
461 u16 pages;
462 u16 jited:1,
463 jit_requested:1,
464 locked:1,
465 gpl_compatible:1,
466 cb_access:1,
467 dst_needed:1,
468 blinded:1,
469 is_func:1,
470 kprobe_override:1;
471 enum bpf_prog_type type;
472 enum bpf_attach_type expected_attach_type;
473 u32 len;
474 u32 jited_len;
475 u8 tag[BPF_TAG_SIZE];
476 struct bpf_prog_aux *aux;
477 struct sock_fprog_kern *orig_prog;
478 unsigned int (*bpf_func)(const void *ctx,
479 const struct bpf_insn *insn);
480
481 union {
482 struct sock_filter insns[0];
483 struct bpf_insn insnsi[0];
484 };
485};
486
487struct sk_filter {
488 refcount_t refcnt;
489 struct rcu_head rcu;
490 struct bpf_prog *prog;
491};
492
493#define BPF_PROG_RUN(filter, ctx) (*(filter)->bpf_func)(ctx, (filter)->insnsi)
494
495#define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN
496
497struct bpf_skb_data_end {
498 struct qdisc_skb_cb qdisc_cb;
499 void *data_meta;
500 void *data_end;
501};
502
503struct xdp_buff {
504 void *data;
505 void *data_end;
506 void *data_meta;
507 void *data_hard_start;
508 struct xdp_rxq_info *rxq;
509};
510
511struct sk_msg_buff {
512 void *data;
513 void *data_end;
514 __u32 apply_bytes;
515 __u32 cork_bytes;
516 int sg_copybreak;
517 int sg_start;
518 int sg_curr;
519 int sg_end;
520 struct scatterlist sg_data[MAX_SKB_FRAGS];
521 bool sg_copy[MAX_SKB_FRAGS];
522 __u32 key;
523 __u32 flags;
524 struct bpf_map *map;
525 struct sk_buff *skb;
526 struct list_head list;
527};
528
529
530
531
532
533
534
535static inline void bpf_compute_data_pointers(struct sk_buff *skb)
536{
537 struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
538
539 BUILD_BUG_ON(sizeof(*cb) > FIELD_SIZEOF(struct sk_buff, cb));
540 cb->data_meta = skb->data - skb_metadata_len(skb);
541 cb->data_end = skb->data + skb_headlen(skb);
542}
543
544static inline u8 *bpf_skb_cb(struct sk_buff *skb)
545{
546
547
548
549
550
551
552
553
554
555
556 BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != BPF_SKB_CB_LEN);
557 BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) !=
558 FIELD_SIZEOF(struct qdisc_skb_cb, data));
559
560 return qdisc_skb_cb(skb)->data;
561}
562
563static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
564 struct sk_buff *skb)
565{
566 u8 *cb_data = bpf_skb_cb(skb);
567 u8 cb_saved[BPF_SKB_CB_LEN];
568 u32 res;
569
570 if (unlikely(prog->cb_access)) {
571 memcpy(cb_saved, cb_data, sizeof(cb_saved));
572 memset(cb_data, 0, sizeof(cb_saved));
573 }
574
575 res = BPF_PROG_RUN(prog, skb);
576
577 if (unlikely(prog->cb_access))
578 memcpy(cb_data, cb_saved, sizeof(cb_saved));
579
580 return res;
581}
582
583static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog,
584 struct sk_buff *skb)
585{
586 u8 *cb_data = bpf_skb_cb(skb);
587
588 if (unlikely(prog->cb_access))
589 memset(cb_data, 0, BPF_SKB_CB_LEN);
590
591 return BPF_PROG_RUN(prog, skb);
592}
593
594static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
595 struct xdp_buff *xdp)
596{
597
598
599
600
601
602
603 return BPF_PROG_RUN(prog, xdp);
604}
605
606static inline u32 bpf_prog_insn_size(const struct bpf_prog *prog)
607{
608 return prog->len * sizeof(struct bpf_insn);
609}
610
611static inline u32 bpf_prog_tag_scratch_size(const struct bpf_prog *prog)
612{
613 return round_up(bpf_prog_insn_size(prog) +
614 sizeof(__be64) + 1, SHA_MESSAGE_BYTES);
615}
616
617static inline unsigned int bpf_prog_size(unsigned int proglen)
618{
619 return max(sizeof(struct bpf_prog),
620 offsetof(struct bpf_prog, insns[proglen]));
621}
622
623static inline bool bpf_prog_was_classic(const struct bpf_prog *prog)
624{
625
626
627
628
629
630 return prog->type == BPF_PROG_TYPE_UNSPEC;
631}
632
633static inline bool
634bpf_ctx_narrow_access_ok(u32 off, u32 size, const u32 size_default)
635{
636 bool off_ok;
637#ifdef __LITTLE_ENDIAN
638 off_ok = (off & (size_default - 1)) == 0;
639#else
640 off_ok = (off & (size_default - 1)) + size == size_default;
641#endif
642 return off_ok && size <= size_default && (size & (size - 1)) == 0;
643}
644
645#define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
646
647#ifdef CONFIG_ARCH_HAS_SET_MEMORY
648static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
649{
650 fp->locked = 1;
651 WARN_ON_ONCE(set_memory_ro((unsigned long)fp, fp->pages));
652}
653
654static inline void bpf_prog_unlock_ro(struct bpf_prog *fp)
655{
656 if (fp->locked) {
657 WARN_ON_ONCE(set_memory_rw((unsigned long)fp, fp->pages));
658
659
660
661 fp->locked = 0;
662 }
663}
664
665static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr)
666{
667 WARN_ON_ONCE(set_memory_ro((unsigned long)hdr, hdr->pages));
668}
669
670static inline void bpf_jit_binary_unlock_ro(struct bpf_binary_header *hdr)
671{
672 WARN_ON_ONCE(set_memory_rw((unsigned long)hdr, hdr->pages));
673}
674#else
675static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
676{
677}
678
679static inline void bpf_prog_unlock_ro(struct bpf_prog *fp)
680{
681}
682
683static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr)
684{
685}
686
687static inline void bpf_jit_binary_unlock_ro(struct bpf_binary_header *hdr)
688{
689}
690#endif
691
692static inline struct bpf_binary_header *
693bpf_jit_binary_hdr(const struct bpf_prog *fp)
694{
695 unsigned long real_start = (unsigned long)fp->bpf_func;
696 unsigned long addr = real_start & PAGE_MASK;
697
698 return (void *)addr;
699}
700
701int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap);
702static inline int sk_filter(struct sock *sk, struct sk_buff *skb)
703{
704 return sk_filter_trim_cap(sk, skb, 1);
705}
706
707struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err);
708void bpf_prog_free(struct bpf_prog *fp);
709
710bool bpf_opcode_in_insntable(u8 code);
711
712struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags);
713struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
714 gfp_t gfp_extra_flags);
715void __bpf_prog_free(struct bpf_prog *fp);
716
717static inline void bpf_prog_unlock_free(struct bpf_prog *fp)
718{
719 bpf_prog_unlock_ro(fp);
720 __bpf_prog_free(fp);
721}
722
723typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter,
724 unsigned int flen);
725
726int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog);
727int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
728 bpf_aux_classic_check_t trans, bool save_orig);
729void bpf_prog_destroy(struct bpf_prog *fp);
730
731int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
732int sk_attach_bpf(u32 ufd, struct sock *sk);
733int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk);
734int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk);
735int sk_detach_filter(struct sock *sk);
736int sk_get_filter(struct sock *sk, struct sock_filter __user *filter,
737 unsigned int len);
738
739bool sk_filter_charge(struct sock *sk, struct sk_filter *fp);
740void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);
741
742u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
743#define __bpf_call_base_args \
744 ((u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)) \
745 __bpf_call_base)
746
747struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
748void bpf_jit_compile(struct bpf_prog *prog);
749bool bpf_helper_changes_pkt_data(void *func);
750
751static inline bool bpf_dump_raw_ok(void)
752{
753
754
755
756 return kallsyms_show_value() == 1;
757}
758
759struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
760 const struct bpf_insn *patch, u32 len);
761
762
763
764
765
766
767
768int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
769 struct bpf_prog *prog);
770int xdp_do_redirect(struct net_device *dev,
771 struct xdp_buff *xdp,
772 struct bpf_prog *prog);
773void xdp_do_flush_map(void);
774
775
776
777
778static __always_inline void
779xdp_set_data_meta_invalid(struct xdp_buff *xdp)
780{
781 xdp->data_meta = xdp->data + 1;
782}
783
784static __always_inline bool
785xdp_data_meta_unsupported(const struct xdp_buff *xdp)
786{
787 return unlikely(xdp->data_meta > xdp->data);
788}
789
790void bpf_warn_invalid_xdp_action(u32 act);
791
792struct sock *do_sk_redirect_map(struct sk_buff *skb);
793struct sock *do_msg_redirect_map(struct sk_msg_buff *md);
794
795#ifdef CONFIG_BPF_JIT
796extern int bpf_jit_enable;
797extern int bpf_jit_harden;
798extern int bpf_jit_kallsyms;
799
800typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size);
801
802struct bpf_binary_header *
803bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
804 unsigned int alignment,
805 bpf_jit_fill_hole_t bpf_fill_ill_insns);
806void bpf_jit_binary_free(struct bpf_binary_header *hdr);
807
808void bpf_jit_free(struct bpf_prog *fp);
809
810struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp);
811void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other);
812
813static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
814 u32 pass, void *image)
815{
816 pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen,
817 proglen, pass, image, current->comm, task_pid_nr(current));
818
819 if (image)
820 print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
821 16, 1, image, proglen, false);
822}
823
824static inline bool bpf_jit_is_ebpf(void)
825{
826# ifdef CONFIG_HAVE_EBPF_JIT
827 return true;
828# else
829 return false;
830# endif
831}
832
833static inline bool ebpf_jit_enabled(void)
834{
835 return bpf_jit_enable && bpf_jit_is_ebpf();
836}
837
838static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
839{
840 return fp->jited && bpf_jit_is_ebpf();
841}
842
843static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
844{
845
846
847
848
849 if (!bpf_jit_is_ebpf())
850 return false;
851 if (!prog->jit_requested)
852 return false;
853 if (!bpf_jit_harden)
854 return false;
855 if (bpf_jit_harden == 1 && capable(CAP_SYS_ADMIN))
856 return false;
857
858 return true;
859}
860
861static inline bool bpf_jit_kallsyms_enabled(void)
862{
863
864
865
866 if (bpf_jit_harden)
867 return false;
868 if (!bpf_jit_kallsyms)
869 return false;
870 if (bpf_jit_kallsyms == 1)
871 return true;
872
873 return false;
874}
875
876const char *__bpf_address_lookup(unsigned long addr, unsigned long *size,
877 unsigned long *off, char *sym);
878bool is_bpf_text_address(unsigned long addr);
879int bpf_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
880 char *sym);
881
882static inline const char *
883bpf_address_lookup(unsigned long addr, unsigned long *size,
884 unsigned long *off, char **modname, char *sym)
885{
886 const char *ret = __bpf_address_lookup(addr, size, off, sym);
887
888 if (ret && modname)
889 *modname = NULL;
890 return ret;
891}
892
893void bpf_prog_kallsyms_add(struct bpf_prog *fp);
894void bpf_prog_kallsyms_del(struct bpf_prog *fp);
895
896#else
897
898static inline bool ebpf_jit_enabled(void)
899{
900 return false;
901}
902
903static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
904{
905 return false;
906}
907
908static inline void bpf_jit_free(struct bpf_prog *fp)
909{
910 bpf_prog_unlock_free(fp);
911}
912
913static inline bool bpf_jit_kallsyms_enabled(void)
914{
915 return false;
916}
917
918static inline const char *
919__bpf_address_lookup(unsigned long addr, unsigned long *size,
920 unsigned long *off, char *sym)
921{
922 return NULL;
923}
924
925static inline bool is_bpf_text_address(unsigned long addr)
926{
927 return false;
928}
929
930static inline int bpf_get_kallsym(unsigned int symnum, unsigned long *value,
931 char *type, char *sym)
932{
933 return -ERANGE;
934}
935
936static inline const char *
937bpf_address_lookup(unsigned long addr, unsigned long *size,
938 unsigned long *off, char **modname, char *sym)
939{
940 return NULL;
941}
942
943static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp)
944{
945}
946
947static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp)
948{
949}
950#endif
951
952#define BPF_ANC BIT(15)
953
954static inline bool bpf_needs_clear_a(const struct sock_filter *first)
955{
956 switch (first->code) {
957 case BPF_RET | BPF_K:
958 case BPF_LD | BPF_W | BPF_LEN:
959 return false;
960
961 case BPF_LD | BPF_W | BPF_ABS:
962 case BPF_LD | BPF_H | BPF_ABS:
963 case BPF_LD | BPF_B | BPF_ABS:
964 if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X)
965 return true;
966 return false;
967
968 default:
969 return true;
970 }
971}
972
973static inline u16 bpf_anc_helper(const struct sock_filter *ftest)
974{
975 BUG_ON(ftest->code & BPF_ANC);
976
977 switch (ftest->code) {
978 case BPF_LD | BPF_W | BPF_ABS:
979 case BPF_LD | BPF_H | BPF_ABS:
980 case BPF_LD | BPF_B | BPF_ABS:
981#define BPF_ANCILLARY(CODE) case SKF_AD_OFF + SKF_AD_##CODE: \
982 return BPF_ANC | SKF_AD_##CODE
983 switch (ftest->k) {
984 BPF_ANCILLARY(PROTOCOL);
985 BPF_ANCILLARY(PKTTYPE);
986 BPF_ANCILLARY(IFINDEX);
987 BPF_ANCILLARY(NLATTR);
988 BPF_ANCILLARY(NLATTR_NEST);
989 BPF_ANCILLARY(MARK);
990 BPF_ANCILLARY(QUEUE);
991 BPF_ANCILLARY(HATYPE);
992 BPF_ANCILLARY(RXHASH);
993 BPF_ANCILLARY(CPU);
994 BPF_ANCILLARY(ALU_XOR_X);
995 BPF_ANCILLARY(VLAN_TAG);
996 BPF_ANCILLARY(VLAN_TAG_PRESENT);
997 BPF_ANCILLARY(PAY_OFFSET);
998 BPF_ANCILLARY(RANDOM);
999 BPF_ANCILLARY(VLAN_TPID);
1000 }
1001
1002 default:
1003 return ftest->code;
1004 }
1005}
1006
1007void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb,
1008 int k, unsigned int size);
1009
1010static inline void *bpf_load_pointer(const struct sk_buff *skb, int k,
1011 unsigned int size, void *buffer)
1012{
1013 if (k >= 0)
1014 return skb_header_pointer(skb, k, size, buffer);
1015
1016 return bpf_internal_load_pointer_neg_helper(skb, k, size);
1017}
1018
1019static inline int bpf_tell_extensions(void)
1020{
1021 return SKF_AD_MAX;
1022}
1023
1024struct bpf_sock_addr_kern {
1025 struct sock *sk;
1026 struct sockaddr *uaddr;
1027
1028
1029
1030
1031 u64 tmp_reg;
1032};
1033
1034struct bpf_sock_ops_kern {
1035 struct sock *sk;
1036 u32 op;
1037 union {
1038 u32 args[4];
1039 u32 reply;
1040 u32 replylong[4];
1041 };
1042 u32 is_fullsock;
1043 u64 temp;
1044
1045
1046
1047
1048
1049
1050
1051
1052};
1053
1054#endif
1055