2 * Linux Socket Filter Data Structures
4 #ifndef __LINUX_FILTER_H__
5 #define __LINUX_FILTER_H__
9 #include <linux/atomic.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/cryptohash.h>
20 #include <net/sch_generic.h>
22 #ifdef CONFIG_ARCH_HAS_SET_MEMORY
23 #include <asm/set_memory.h>
26 #include <uapi/linux/filter.h>
27 #include <uapi/linux/bpf.h>
34 /* ArgX, context and stack frame pointer register positions. Note,
35 * Arg1, Arg2, Arg3, etc are used as argument mappings of function
36 * calls in BPF_CALL instruction.
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
46 /* Additional register mappings for converted user programs. */
47 #define BPF_REG_A BPF_REG_0
48 #define BPF_REG_X BPF_REG_7
49 #define BPF_REG_TMP BPF_REG_8
51 /* Kernel hidden auxiliary/helper register for hardening step.
52 * Only used by eBPF JITs. It's nothing more than a temporary
53 * register that JITs use internally, only that here it's part
54 * of eBPF instructions that have been rewritten for blinding
55 * constants. See JIT pre-step in bpf_jit_blind_constants().
57 #define BPF_REG_AX MAX_BPF_REG
58 #define MAX_BPF_JIT_REG (MAX_BPF_REG + 1)
60 /* As per nm, we expose JITed images as text (code) section for
61 * kallsyms. That way, tools like perf can find it to match
64 #define BPF_SYM_ELF_TYPE 't'
66 /* BPF program can access up to 512 bytes of stack space. */
67 #define MAX_BPF_STACK 512
69 #define BPF_TAG_SIZE 8
71 /* Helper macros for filter block array initializers. */
73 /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
75 #define BPF_ALU64_REG(OP, DST, SRC) \
76 ((struct bpf_insn) { \
77 .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \
83 #define BPF_ALU32_REG(OP, DST, SRC) \
84 ((struct bpf_insn) { \
85 .code = BPF_ALU | BPF_OP(OP) | BPF_X, \
91 /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
93 #define BPF_ALU64_IMM(OP, DST, IMM) \
94 ((struct bpf_insn) { \
95 .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \
101 #define BPF_ALU32_IMM(OP, DST, IMM) \
102 ((struct bpf_insn) { \
103 .code = BPF_ALU | BPF_OP(OP) | BPF_K, \
109 /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */
111 #define BPF_ENDIAN(TYPE, DST, LEN) \
112 ((struct bpf_insn) { \
113 .code = BPF_ALU | BPF_END | BPF_SRC(TYPE), \
119 /* Short form of mov, dst_reg = src_reg */
121 #define BPF_MOV64_REG(DST, SRC) \
122 ((struct bpf_insn) { \
123 .code = BPF_ALU64 | BPF_MOV | BPF_X, \
129 #define BPF_MOV32_REG(DST, SRC) \
130 ((struct bpf_insn) { \
131 .code = BPF_ALU | BPF_MOV | BPF_X, \
137 /* Short form of mov, dst_reg = imm32 */
139 #define BPF_MOV64_IMM(DST, IMM) \
140 ((struct bpf_insn) { \
141 .code = BPF_ALU64 | BPF_MOV | BPF_K, \
147 #define BPF_MOV32_IMM(DST, IMM) \
148 ((struct bpf_insn) { \
149 .code = BPF_ALU | BPF_MOV | BPF_K, \
155 /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
156 #define BPF_LD_IMM64(DST, IMM) \
157 BPF_LD_IMM64_RAW(DST, 0, IMM)
159 #define BPF_LD_IMM64_RAW(DST, SRC, IMM) \
160 ((struct bpf_insn) { \
161 .code = BPF_LD | BPF_DW | BPF_IMM, \
165 .imm = (__u32) (IMM) }), \
166 ((struct bpf_insn) { \
167 .code = 0, /* zero is reserved opcode */ \
171 .imm = ((__u64) (IMM)) >> 32 })
173 /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
174 #define BPF_LD_MAP_FD(DST, MAP_FD) \
175 BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
177 /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */
179 #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \
180 ((struct bpf_insn) { \
181 .code = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE), \
187 #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM) \
188 ((struct bpf_insn) { \
189 .code = BPF_ALU | BPF_MOV | BPF_SRC(TYPE), \
195 /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
197 #define BPF_LD_ABS(SIZE, IMM) \
198 ((struct bpf_insn) { \
199 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \
205 /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */
207 #define BPF_LD_IND(SIZE, SRC, IMM) \
208 ((struct bpf_insn) { \
209 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_IND, \
215 /* Memory load, dst_reg = *(uint *) (src_reg + off16) */
217 #define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \
218 ((struct bpf_insn) { \
219 .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \
225 /* Memory store, *(uint *) (dst_reg + off16) = src_reg */
227 #define BPF_STX_MEM(SIZE, DST, SRC, OFF) \
228 ((struct bpf_insn) { \
229 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \
235 /* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */
237 #define BPF_STX_XADD(SIZE, DST, SRC, OFF) \
238 ((struct bpf_insn) { \
239 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD, \
245 /* Memory store, *(uint *) (dst_reg + off16) = imm32 */
247 #define BPF_ST_MEM(SIZE, DST, OFF, IMM) \
248 ((struct bpf_insn) { \
249 .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \
255 /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
257 #define BPF_JMP_REG(OP, DST, SRC, OFF) \
258 ((struct bpf_insn) { \
259 .code = BPF_JMP | BPF_OP(OP) | BPF_X, \
265 /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
267 #define BPF_JMP_IMM(OP, DST, IMM, OFF) \
268 ((struct bpf_insn) { \
269 .code = BPF_JMP | BPF_OP(OP) | BPF_K, \
277 #define BPF_EMIT_CALL(FUNC) \
278 ((struct bpf_insn) { \
279 .code = BPF_JMP | BPF_CALL, \
283 .imm = ((FUNC) - __bpf_call_base) })
285 /* Raw code statement block */
287 #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \
288 ((struct bpf_insn) { \
297 #define BPF_EXIT_INSN() \
298 ((struct bpf_insn) { \
299 .code = BPF_JMP | BPF_EXIT, \
305 /* Internal classic blocks for direct assignment */
307 #define __BPF_STMT(CODE, K) \
308 ((struct sock_filter) BPF_STMT(CODE, K))
310 #define __BPF_JUMP(CODE, K, JT, JF) \
311 ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF))
313 #define bytes_to_bpf_size(bytes) \
315 int bpf_size = -EINVAL; \
317 if (bytes == sizeof(u8)) \
319 else if (bytes == sizeof(u16)) \
321 else if (bytes == sizeof(u32)) \
323 else if (bytes == sizeof(u64)) \
329 #define BPF_SIZEOF(type) \
331 const int __size = bytes_to_bpf_size(sizeof(type)); \
332 BUILD_BUG_ON(__size < 0); \
336 #define BPF_FIELD_SIZEOF(type, field) \
338 const int __size = bytes_to_bpf_size(FIELD_SIZEOF(type, field)); \
339 BUILD_BUG_ON(__size < 0); \
343 #define __BPF_MAP_0(m, v, ...) v
344 #define __BPF_MAP_1(m, v, t, a, ...) m(t, a)
345 #define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__)
346 #define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__)
347 #define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__)
348 #define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__)
350 #define __BPF_REG_0(...) __BPF_PAD(5)
351 #define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4)
352 #define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3)
353 #define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2)
354 #define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1)
355 #define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__)
357 #define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__)
358 #define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__)
360 #define __BPF_CAST(t, a) \
363 typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long), \
364 (unsigned long)0, (t)0))) a
368 #define __BPF_DECL_ARGS(t, a) t a
369 #define __BPF_DECL_REGS(t, a) u64 a
371 #define __BPF_PAD(n) \
372 __BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2, \
373 u64, __ur_3, u64, __ur_4, u64, __ur_5)
375 #define BPF_CALL_x(x, name, ...) \
376 static __always_inline \
377 u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)); \
378 u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)); \
379 u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)) \
381 return ____##name(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\
383 static __always_inline \
384 u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__))
386 #define BPF_CALL_0(name, ...) BPF_CALL_x(0, name, __VA_ARGS__)
387 #define BPF_CALL_1(name, ...) BPF_CALL_x(1, name, __VA_ARGS__)
388 #define BPF_CALL_2(name, ...) BPF_CALL_x(2, name, __VA_ARGS__)
389 #define BPF_CALL_3(name, ...) BPF_CALL_x(3, name, __VA_ARGS__)
390 #define BPF_CALL_4(name, ...) BPF_CALL_x(4, name, __VA_ARGS__)
391 #define BPF_CALL_5(name, ...) BPF_CALL_x(5, name, __VA_ARGS__)
394 /* A struct sock_filter is architecture independent. */
395 struct compat_sock_fprog {
397 compat_uptr_t filter; /* struct sock_filter * */
401 struct sock_fprog_kern {
403 struct sock_filter *filter;
406 struct bpf_binary_header {
412 u16 pages; /* Number of allocated pages */
413 kmemcheck_bitfield_begin(meta);
414 u16 jited:1, /* Is our filter JIT'ed? */
415 locked:1, /* Program image locked? */
416 gpl_compatible:1, /* Is filter GPL compatible? */
417 cb_access:1, /* Is control block accessed? */
418 dst_needed:1; /* Do we need dst entry? */
419 kmemcheck_bitfield_end(meta);
420 enum bpf_prog_type type; /* Type of BPF program */
421 u32 len; /* Number of filter blocks */
422 u8 tag[BPF_TAG_SIZE];
423 struct bpf_prog_aux *aux; /* Auxiliary fields */
424 struct sock_fprog_kern *orig_prog; /* Original BPF program */
425 unsigned int (*bpf_func)(const void *ctx,
426 const struct bpf_insn *insn);
427 /* Instructions for interpreter */
429 struct sock_filter insns[0];
430 struct bpf_insn insnsi[0];
437 struct bpf_prog *prog;
440 #define BPF_PROG_RUN(filter, ctx) (*filter->bpf_func)(ctx, filter->insnsi)
442 #define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN
444 struct bpf_skb_data_end {
445 struct qdisc_skb_cb qdisc_cb;
452 void *data_hard_start;
455 /* compute the linear packet data range [data, data_end) which
456 * will be accessed by cls_bpf, act_bpf and lwt programs
458 static inline void bpf_compute_data_end(struct sk_buff *skb)
460 struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
462 BUILD_BUG_ON(sizeof(*cb) > FIELD_SIZEOF(struct sk_buff, cb));
463 cb->data_end = skb->data + skb_headlen(skb);
466 static inline u8 *bpf_skb_cb(struct sk_buff *skb)
468 /* eBPF programs may read/write skb->cb[] area to transfer meta
469 * data between tail calls. Since this also needs to work with
470 * tc, that scratch memory is mapped to qdisc_skb_cb's data area.
472 * In some socket filter cases, the cb unfortunately needs to be
473 * saved/restored so that protocol specific skb->cb[] data won't
474 * be lost. In any case, due to unpriviledged eBPF programs
475 * attached to sockets, we need to clear the bpf_skb_cb() area
476 * to not leak previous contents to user space.
478 BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != BPF_SKB_CB_LEN);
479 BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) !=
480 FIELD_SIZEOF(struct qdisc_skb_cb, data));
482 return qdisc_skb_cb(skb)->data;
485 static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
488 u8 *cb_data = bpf_skb_cb(skb);
489 u8 cb_saved[BPF_SKB_CB_LEN];
492 if (unlikely(prog->cb_access)) {
493 memcpy(cb_saved, cb_data, sizeof(cb_saved));
494 memset(cb_data, 0, sizeof(cb_saved));
497 res = BPF_PROG_RUN(prog, skb);
499 if (unlikely(prog->cb_access))
500 memcpy(cb_data, cb_saved, sizeof(cb_saved));
505 static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog,
508 u8 *cb_data = bpf_skb_cb(skb);
510 if (unlikely(prog->cb_access))
511 memset(cb_data, 0, BPF_SKB_CB_LEN);
513 return BPF_PROG_RUN(prog, skb);
516 static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
517 struct xdp_buff *xdp)
519 /* Caller needs to hold rcu_read_lock() (!), otherwise program
520 * can be released while still running, or map elements could be
521 * freed early while still having concurrent users. XDP fastpath
522 * already takes rcu_read_lock() when fetching the program, so
523 * it's not necessary here anymore.
525 return BPF_PROG_RUN(prog, xdp);
528 static inline u32 bpf_prog_insn_size(const struct bpf_prog *prog)
530 return prog->len * sizeof(struct bpf_insn);
533 static inline u32 bpf_prog_tag_scratch_size(const struct bpf_prog *prog)
535 return round_up(bpf_prog_insn_size(prog) +
536 sizeof(__be64) + 1, SHA_MESSAGE_BYTES);
539 static inline unsigned int bpf_prog_size(unsigned int proglen)
541 return max(sizeof(struct bpf_prog),
542 offsetof(struct bpf_prog, insns[proglen]));
545 static inline bool bpf_prog_was_classic(const struct bpf_prog *prog)
547 /* When classic BPF programs have been loaded and the arch
548 * does not have a classic BPF JIT (anymore), they have been
549 * converted via bpf_migrate_filter() to eBPF and thus always
550 * have an unspec program type.
552 return prog->type == BPF_PROG_TYPE_UNSPEC;
555 #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
557 #ifdef CONFIG_ARCH_HAS_SET_MEMORY
558 static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
561 WARN_ON_ONCE(set_memory_ro((unsigned long)fp, fp->pages));
564 static inline void bpf_prog_unlock_ro(struct bpf_prog *fp)
567 WARN_ON_ONCE(set_memory_rw((unsigned long)fp, fp->pages));
568 /* In case set_memory_rw() fails, we want to be the first
569 * to crash here instead of some random place later on.
575 static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr)
577 WARN_ON_ONCE(set_memory_ro((unsigned long)hdr, hdr->pages));
580 static inline void bpf_jit_binary_unlock_ro(struct bpf_binary_header *hdr)
582 WARN_ON_ONCE(set_memory_rw((unsigned long)hdr, hdr->pages));
585 static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
589 static inline void bpf_prog_unlock_ro(struct bpf_prog *fp)
593 static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr)
597 static inline void bpf_jit_binary_unlock_ro(struct bpf_binary_header *hdr)
600 #endif /* CONFIG_ARCH_HAS_SET_MEMORY */
602 static inline struct bpf_binary_header *
603 bpf_jit_binary_hdr(const struct bpf_prog *fp)
605 unsigned long real_start = (unsigned long)fp->bpf_func;
606 unsigned long addr = real_start & PAGE_MASK;
611 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap);
612 static inline int sk_filter(struct sock *sk, struct sk_buff *skb)
614 return sk_filter_trim_cap(sk, skb, 1);
617 struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err);
618 void bpf_prog_free(struct bpf_prog *fp);
620 struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags);
621 struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
622 gfp_t gfp_extra_flags);
623 void __bpf_prog_free(struct bpf_prog *fp);
625 static inline void bpf_prog_unlock_free(struct bpf_prog *fp)
627 bpf_prog_unlock_ro(fp);
631 typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter,
634 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog);
635 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
636 bpf_aux_classic_check_t trans, bool save_orig);
637 void bpf_prog_destroy(struct bpf_prog *fp);
639 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
640 int sk_attach_bpf(u32 ufd, struct sock *sk);
641 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk);
642 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk);
643 int sk_detach_filter(struct sock *sk);
644 int sk_get_filter(struct sock *sk, struct sock_filter __user *filter,
647 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp);
648 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);
650 u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
652 struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
653 void bpf_jit_compile(struct bpf_prog *prog);
654 bool bpf_helper_changes_pkt_data(void *func);
656 struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
657 const struct bpf_insn *patch, u32 len);
658 void bpf_warn_invalid_xdp_action(u32 act);
660 #ifdef CONFIG_BPF_JIT
661 extern int bpf_jit_enable;
662 extern int bpf_jit_harden;
663 extern int bpf_jit_kallsyms;
665 typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size);
667 struct bpf_binary_header *
668 bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
669 unsigned int alignment,
670 bpf_jit_fill_hole_t bpf_fill_ill_insns);
671 void bpf_jit_binary_free(struct bpf_binary_header *hdr);
673 void bpf_jit_free(struct bpf_prog *fp);
675 struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp);
676 void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other);
678 static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
679 u32 pass, void *image)
681 pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen,
682 proglen, pass, image, current->comm, task_pid_nr(current));
685 print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
686 16, 1, image, proglen, false);
689 static inline bool bpf_jit_is_ebpf(void)
691 # ifdef CONFIG_HAVE_EBPF_JIT
698 static inline bool ebpf_jit_enabled(void)
700 return bpf_jit_enable && bpf_jit_is_ebpf();
703 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
705 return fp->jited && bpf_jit_is_ebpf();
708 static inline bool bpf_jit_blinding_enabled(void)
710 /* These are the prerequisites, should someone ever have the
711 * idea to call blinding outside of them, we make sure to
714 if (!bpf_jit_is_ebpf())
720 if (bpf_jit_harden == 1 && capable(CAP_SYS_ADMIN))
726 static inline bool bpf_jit_kallsyms_enabled(void)
728 /* There are a couple of corner cases where kallsyms should
729 * not be enabled f.e. on hardening.
733 if (!bpf_jit_kallsyms)
735 if (bpf_jit_kallsyms == 1)
741 const char *__bpf_address_lookup(unsigned long addr, unsigned long *size,
742 unsigned long *off, char *sym);
743 bool is_bpf_text_address(unsigned long addr);
744 int bpf_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
747 static inline const char *
748 bpf_address_lookup(unsigned long addr, unsigned long *size,
749 unsigned long *off, char **modname, char *sym)
751 const char *ret = __bpf_address_lookup(addr, size, off, sym);
758 void bpf_prog_kallsyms_add(struct bpf_prog *fp);
759 void bpf_prog_kallsyms_del(struct bpf_prog *fp);
761 #else /* CONFIG_BPF_JIT */
763 static inline bool ebpf_jit_enabled(void)
768 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
773 static inline void bpf_jit_free(struct bpf_prog *fp)
775 bpf_prog_unlock_free(fp);
778 static inline bool bpf_jit_kallsyms_enabled(void)
783 static inline const char *
784 __bpf_address_lookup(unsigned long addr, unsigned long *size,
785 unsigned long *off, char *sym)
790 static inline bool is_bpf_text_address(unsigned long addr)
795 static inline int bpf_get_kallsym(unsigned int symnum, unsigned long *value,
796 char *type, char *sym)
801 static inline const char *
802 bpf_address_lookup(unsigned long addr, unsigned long *size,
803 unsigned long *off, char **modname, char *sym)
808 static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp)
812 static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp)
815 #endif /* CONFIG_BPF_JIT */
817 #define BPF_ANC BIT(15)
819 static inline bool bpf_needs_clear_a(const struct sock_filter *first)
821 switch (first->code) {
822 case BPF_RET | BPF_K:
823 case BPF_LD | BPF_W | BPF_LEN:
826 case BPF_LD | BPF_W | BPF_ABS:
827 case BPF_LD | BPF_H | BPF_ABS:
828 case BPF_LD | BPF_B | BPF_ABS:
829 if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X)
838 static inline u16 bpf_anc_helper(const struct sock_filter *ftest)
840 BUG_ON(ftest->code & BPF_ANC);
842 switch (ftest->code) {
843 case BPF_LD | BPF_W | BPF_ABS:
844 case BPF_LD | BPF_H | BPF_ABS:
845 case BPF_LD | BPF_B | BPF_ABS:
846 #define BPF_ANCILLARY(CODE) case SKF_AD_OFF + SKF_AD_##CODE: \
847 return BPF_ANC | SKF_AD_##CODE
849 BPF_ANCILLARY(PROTOCOL);
850 BPF_ANCILLARY(PKTTYPE);
851 BPF_ANCILLARY(IFINDEX);
852 BPF_ANCILLARY(NLATTR);
853 BPF_ANCILLARY(NLATTR_NEST);
855 BPF_ANCILLARY(QUEUE);
856 BPF_ANCILLARY(HATYPE);
857 BPF_ANCILLARY(RXHASH);
859 BPF_ANCILLARY(ALU_XOR_X);
860 BPF_ANCILLARY(VLAN_TAG);
861 BPF_ANCILLARY(VLAN_TAG_PRESENT);
862 BPF_ANCILLARY(PAY_OFFSET);
863 BPF_ANCILLARY(RANDOM);
864 BPF_ANCILLARY(VLAN_TPID);
872 void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb,
873 int k, unsigned int size);
875 static inline void *bpf_load_pointer(const struct sk_buff *skb, int k,
876 unsigned int size, void *buffer)
879 return skb_header_pointer(skb, k, size, buffer);
881 return bpf_internal_load_pointer_neg_helper(skb, k, size);
884 static inline int bpf_tell_extensions(void)
889 #endif /* __LINUX_FILTER_H__ */