2 * Linux Socket Filter Data Structures
4 #ifndef __LINUX_FILTER_H__
5 #define __LINUX_FILTER_H__
9 #include <linux/atomic.h>
10 #include <linux/compat.h>
11 #include <linux/skbuff.h>
12 #include <linux/linkage.h>
13 #include <linux/printk.h>
14 #include <linux/workqueue.h>
15 #include <linux/sched.h>
16 #include <linux/capability.h>
17 #include <linux/cryptohash.h>
19 #include <net/sch_generic.h>
21 #include <asm/cacheflush.h>
23 #include <uapi/linux/filter.h>
24 #include <uapi/linux/bpf.h>
31 /* ArgX, context and stack frame pointer register positions. Note,
32 * Arg1, Arg2, Arg3, etc are used as argument mappings of function
33 * calls in BPF_CALL instruction.
35 #define BPF_REG_ARG1 BPF_REG_1
36 #define BPF_REG_ARG2 BPF_REG_2
37 #define BPF_REG_ARG3 BPF_REG_3
38 #define BPF_REG_ARG4 BPF_REG_4
39 #define BPF_REG_ARG5 BPF_REG_5
40 #define BPF_REG_CTX BPF_REG_6
41 #define BPF_REG_FP BPF_REG_10
43 /* Additional register mappings for converted user programs. */
44 #define BPF_REG_A BPF_REG_0
45 #define BPF_REG_X BPF_REG_7
46 #define BPF_REG_TMP BPF_REG_8
48 /* Kernel hidden auxiliary/helper register for hardening step.
49 * Only used by eBPF JITs. It's nothing more than a temporary
50 * register that JITs use internally, only that here it's part
51 * of eBPF instructions that have been rewritten for blinding
52 * constants. See JIT pre-step in bpf_jit_blind_constants().
54 #define BPF_REG_AX MAX_BPF_REG
55 #define MAX_BPF_JIT_REG (MAX_BPF_REG + 1)
57 /* As per nm, we expose JITed images as text (code) section for
58 * kallsyms. That way, tools like perf can find it to match
61 #define BPF_SYM_ELF_TYPE 't'
63 /* BPF program can access up to 512 bytes of stack space. */
64 #define MAX_BPF_STACK 512
66 #define BPF_TAG_SIZE 8
68 /* Helper macros for filter block array initializers. */
70 /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
72 #define BPF_ALU64_REG(OP, DST, SRC) \
73 ((struct bpf_insn) { \
74 .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \
80 #define BPF_ALU32_REG(OP, DST, SRC) \
81 ((struct bpf_insn) { \
82 .code = BPF_ALU | BPF_OP(OP) | BPF_X, \
88 /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
90 #define BPF_ALU64_IMM(OP, DST, IMM) \
91 ((struct bpf_insn) { \
92 .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \
98 #define BPF_ALU32_IMM(OP, DST, IMM) \
99 ((struct bpf_insn) { \
100 .code = BPF_ALU | BPF_OP(OP) | BPF_K, \
106 /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */
108 #define BPF_ENDIAN(TYPE, DST, LEN) \
109 ((struct bpf_insn) { \
110 .code = BPF_ALU | BPF_END | BPF_SRC(TYPE), \
116 /* Short form of mov, dst_reg = src_reg */
118 #define BPF_MOV64_REG(DST, SRC) \
119 ((struct bpf_insn) { \
120 .code = BPF_ALU64 | BPF_MOV | BPF_X, \
126 #define BPF_MOV32_REG(DST, SRC) \
127 ((struct bpf_insn) { \
128 .code = BPF_ALU | BPF_MOV | BPF_X, \
134 /* Short form of mov, dst_reg = imm32 */
136 #define BPF_MOV64_IMM(DST, IMM) \
137 ((struct bpf_insn) { \
138 .code = BPF_ALU64 | BPF_MOV | BPF_K, \
144 #define BPF_MOV32_IMM(DST, IMM) \
145 ((struct bpf_insn) { \
146 .code = BPF_ALU | BPF_MOV | BPF_K, \
152 /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
153 #define BPF_LD_IMM64(DST, IMM) \
154 BPF_LD_IMM64_RAW(DST, 0, IMM)
156 #define BPF_LD_IMM64_RAW(DST, SRC, IMM) \
157 ((struct bpf_insn) { \
158 .code = BPF_LD | BPF_DW | BPF_IMM, \
162 .imm = (__u32) (IMM) }), \
163 ((struct bpf_insn) { \
164 .code = 0, /* zero is reserved opcode */ \
168 .imm = ((__u64) (IMM)) >> 32 })
170 /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
171 #define BPF_LD_MAP_FD(DST, MAP_FD) \
172 BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
174 /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */
176 #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \
177 ((struct bpf_insn) { \
178 .code = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE), \
184 #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM) \
185 ((struct bpf_insn) { \
186 .code = BPF_ALU | BPF_MOV | BPF_SRC(TYPE), \
192 /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
194 #define BPF_LD_ABS(SIZE, IMM) \
195 ((struct bpf_insn) { \
196 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \
202 /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */
204 #define BPF_LD_IND(SIZE, SRC, IMM) \
205 ((struct bpf_insn) { \
206 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_IND, \
212 /* Memory load, dst_reg = *(uint *) (src_reg + off16) */
214 #define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \
215 ((struct bpf_insn) { \
216 .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \
222 /* Memory store, *(uint *) (dst_reg + off16) = src_reg */
224 #define BPF_STX_MEM(SIZE, DST, SRC, OFF) \
225 ((struct bpf_insn) { \
226 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \
232 /* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */
234 #define BPF_STX_XADD(SIZE, DST, SRC, OFF) \
235 ((struct bpf_insn) { \
236 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD, \
242 /* Memory store, *(uint *) (dst_reg + off16) = imm32 */
244 #define BPF_ST_MEM(SIZE, DST, OFF, IMM) \
245 ((struct bpf_insn) { \
246 .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \
252 /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
254 #define BPF_JMP_REG(OP, DST, SRC, OFF) \
255 ((struct bpf_insn) { \
256 .code = BPF_JMP | BPF_OP(OP) | BPF_X, \
262 /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
264 #define BPF_JMP_IMM(OP, DST, IMM, OFF) \
265 ((struct bpf_insn) { \
266 .code = BPF_JMP | BPF_OP(OP) | BPF_K, \
274 #define BPF_EMIT_CALL(FUNC) \
275 ((struct bpf_insn) { \
276 .code = BPF_JMP | BPF_CALL, \
280 .imm = ((FUNC) - __bpf_call_base) })
282 /* Raw code statement block */
284 #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \
285 ((struct bpf_insn) { \
294 #define BPF_EXIT_INSN() \
295 ((struct bpf_insn) { \
296 .code = BPF_JMP | BPF_EXIT, \
302 /* Internal classic blocks for direct assignment */
304 #define __BPF_STMT(CODE, K) \
305 ((struct sock_filter) BPF_STMT(CODE, K))
307 #define __BPF_JUMP(CODE, K, JT, JF) \
308 ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF))
310 #define bytes_to_bpf_size(bytes) \
312 int bpf_size = -EINVAL; \
314 if (bytes == sizeof(u8)) \
316 else if (bytes == sizeof(u16)) \
318 else if (bytes == sizeof(u32)) \
320 else if (bytes == sizeof(u64)) \
326 #define BPF_SIZEOF(type) \
328 const int __size = bytes_to_bpf_size(sizeof(type)); \
329 BUILD_BUG_ON(__size < 0); \
333 #define BPF_FIELD_SIZEOF(type, field) \
335 const int __size = bytes_to_bpf_size(FIELD_SIZEOF(type, field)); \
336 BUILD_BUG_ON(__size < 0); \
340 #define __BPF_MAP_0(m, v, ...) v
341 #define __BPF_MAP_1(m, v, t, a, ...) m(t, a)
342 #define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__)
343 #define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__)
344 #define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__)
345 #define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__)
347 #define __BPF_REG_0(...) __BPF_PAD(5)
348 #define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4)
349 #define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3)
350 #define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2)
351 #define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1)
352 #define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__)
354 #define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__)
355 #define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__)
357 #define __BPF_CAST(t, a) \
360 typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long), \
361 (unsigned long)0, (t)0))) a
365 #define __BPF_DECL_ARGS(t, a) t a
366 #define __BPF_DECL_REGS(t, a) u64 a
368 #define __BPF_PAD(n) \
369 __BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2, \
370 u64, __ur_3, u64, __ur_4, u64, __ur_5)
372 #define BPF_CALL_x(x, name, ...) \
373 static __always_inline \
374 u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)); \
375 u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)); \
376 u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)) \
378 return ____##name(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\
380 static __always_inline \
381 u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__))
383 #define BPF_CALL_0(name, ...) BPF_CALL_x(0, name, __VA_ARGS__)
384 #define BPF_CALL_1(name, ...) BPF_CALL_x(1, name, __VA_ARGS__)
385 #define BPF_CALL_2(name, ...) BPF_CALL_x(2, name, __VA_ARGS__)
386 #define BPF_CALL_3(name, ...) BPF_CALL_x(3, name, __VA_ARGS__)
387 #define BPF_CALL_4(name, ...) BPF_CALL_x(4, name, __VA_ARGS__)
388 #define BPF_CALL_5(name, ...) BPF_CALL_x(5, name, __VA_ARGS__)
391 /* A struct sock_filter is architecture independent. */
392 struct compat_sock_fprog
{
394 compat_uptr_t filter
; /* struct sock_filter * */
398 struct sock_fprog_kern
{
400 struct sock_filter
*filter
;
403 struct bpf_binary_header
{
409 u16 pages
; /* Number of allocated pages */
410 kmemcheck_bitfield_begin(meta
);
411 u16 jited
:1, /* Is our filter JIT'ed? */
412 gpl_compatible
:1, /* Is filter GPL compatible? */
413 cb_access
:1, /* Is control block accessed? */
414 dst_needed
:1, /* Do we need dst entry? */
415 xdp_adjust_head
:1; /* Adjusting pkt head? */
416 kmemcheck_bitfield_end(meta
);
417 enum bpf_prog_type type
; /* Type of BPF program */
418 u32 len
; /* Number of filter blocks */
419 u8 tag
[BPF_TAG_SIZE
];
420 struct bpf_prog_aux
*aux
; /* Auxiliary fields */
421 struct sock_fprog_kern
*orig_prog
; /* Original BPF program */
422 unsigned int (*bpf_func
)(const void *ctx
,
423 const struct bpf_insn
*insn
);
424 /* Instructions for interpreter */
426 struct sock_filter insns
[0];
427 struct bpf_insn insnsi
[0];
434 struct bpf_prog
*prog
;
437 #define BPF_PROG_RUN(filter, ctx) (*filter->bpf_func)(ctx, filter->insnsi)
439 #define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN
441 struct bpf_skb_data_end
{
442 struct qdisc_skb_cb qdisc_cb
;
449 void *data_hard_start
;
452 /* compute the linear packet data range [data, data_end) which
453 * will be accessed by cls_bpf, act_bpf and lwt programs
455 static inline void bpf_compute_data_end(struct sk_buff
*skb
)
457 struct bpf_skb_data_end
*cb
= (struct bpf_skb_data_end
*)skb
->cb
;
459 BUILD_BUG_ON(sizeof(*cb
) > FIELD_SIZEOF(struct sk_buff
, cb
));
460 cb
->data_end
= skb
->data
+ skb_headlen(skb
);
463 static inline u8
*bpf_skb_cb(struct sk_buff
*skb
)
465 /* eBPF programs may read/write skb->cb[] area to transfer meta
466 * data between tail calls. Since this also needs to work with
467 * tc, that scratch memory is mapped to qdisc_skb_cb's data area.
469 * In some socket filter cases, the cb unfortunately needs to be
470 * saved/restored so that protocol specific skb->cb[] data won't
471 * be lost. In any case, due to unpriviledged eBPF programs
472 * attached to sockets, we need to clear the bpf_skb_cb() area
473 * to not leak previous contents to user space.
475 BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff
, cb
) != BPF_SKB_CB_LEN
);
476 BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff
, cb
) !=
477 FIELD_SIZEOF(struct qdisc_skb_cb
, data
));
479 return qdisc_skb_cb(skb
)->data
;
482 static inline u32
bpf_prog_run_save_cb(const struct bpf_prog
*prog
,
485 u8
*cb_data
= bpf_skb_cb(skb
);
486 u8 cb_saved
[BPF_SKB_CB_LEN
];
489 if (unlikely(prog
->cb_access
)) {
490 memcpy(cb_saved
, cb_data
, sizeof(cb_saved
));
491 memset(cb_data
, 0, sizeof(cb_saved
));
494 res
= BPF_PROG_RUN(prog
, skb
);
496 if (unlikely(prog
->cb_access
))
497 memcpy(cb_data
, cb_saved
, sizeof(cb_saved
));
502 static inline u32
bpf_prog_run_clear_cb(const struct bpf_prog
*prog
,
505 u8
*cb_data
= bpf_skb_cb(skb
);
507 if (unlikely(prog
->cb_access
))
508 memset(cb_data
, 0, BPF_SKB_CB_LEN
);
510 return BPF_PROG_RUN(prog
, skb
);
513 static __always_inline u32
bpf_prog_run_xdp(const struct bpf_prog
*prog
,
514 struct xdp_buff
*xdp
)
516 /* Caller needs to hold rcu_read_lock() (!), otherwise program
517 * can be released while still running, or map elements could be
518 * freed early while still having concurrent users. XDP fastpath
519 * already takes rcu_read_lock() when fetching the program, so
520 * it's not necessary here anymore.
522 return BPF_PROG_RUN(prog
, xdp
);
525 static inline u32
bpf_prog_insn_size(const struct bpf_prog
*prog
)
527 return prog
->len
* sizeof(struct bpf_insn
);
530 static inline u32
bpf_prog_tag_scratch_size(const struct bpf_prog
*prog
)
532 return round_up(bpf_prog_insn_size(prog
) +
533 sizeof(__be64
) + 1, SHA_MESSAGE_BYTES
);
536 static inline unsigned int bpf_prog_size(unsigned int proglen
)
538 return max(sizeof(struct bpf_prog
),
539 offsetof(struct bpf_prog
, insns
[proglen
]));
542 static inline bool bpf_prog_was_classic(const struct bpf_prog
*prog
)
544 /* When classic BPF programs have been loaded and the arch
545 * does not have a classic BPF JIT (anymore), they have been
546 * converted via bpf_migrate_filter() to eBPF and thus always
547 * have an unspec program type.
549 return prog
->type
== BPF_PROG_TYPE_UNSPEC
;
552 #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
554 #ifdef CONFIG_ARCH_HAS_SET_MEMORY
555 static inline void bpf_prog_lock_ro(struct bpf_prog
*fp
)
557 set_memory_ro((unsigned long)fp
, fp
->pages
);
560 static inline void bpf_prog_unlock_ro(struct bpf_prog
*fp
)
562 set_memory_rw((unsigned long)fp
, fp
->pages
);
565 static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header
*hdr
)
567 set_memory_ro((unsigned long)hdr
, hdr
->pages
);
570 static inline void bpf_jit_binary_unlock_ro(struct bpf_binary_header
*hdr
)
572 set_memory_rw((unsigned long)hdr
, hdr
->pages
);
575 static inline void bpf_prog_lock_ro(struct bpf_prog
*fp
)
579 static inline void bpf_prog_unlock_ro(struct bpf_prog
*fp
)
583 static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header
*hdr
)
587 static inline void bpf_jit_binary_unlock_ro(struct bpf_binary_header
*hdr
)
590 #endif /* CONFIG_ARCH_HAS_SET_MEMORY */
592 static inline struct bpf_binary_header
*
593 bpf_jit_binary_hdr(const struct bpf_prog
*fp
)
595 unsigned long real_start
= (unsigned long)fp
->bpf_func
;
596 unsigned long addr
= real_start
& PAGE_MASK
;
601 int sk_filter_trim_cap(struct sock
*sk
, struct sk_buff
*skb
, unsigned int cap
);
602 static inline int sk_filter(struct sock
*sk
, struct sk_buff
*skb
)
604 return sk_filter_trim_cap(sk
, skb
, 1);
607 struct bpf_prog
*bpf_prog_select_runtime(struct bpf_prog
*fp
, int *err
);
608 void bpf_prog_free(struct bpf_prog
*fp
);
610 struct bpf_prog
*bpf_prog_alloc(unsigned int size
, gfp_t gfp_extra_flags
);
611 struct bpf_prog
*bpf_prog_realloc(struct bpf_prog
*fp_old
, unsigned int size
,
612 gfp_t gfp_extra_flags
);
613 void __bpf_prog_free(struct bpf_prog
*fp
);
615 static inline void bpf_prog_unlock_free(struct bpf_prog
*fp
)
617 bpf_prog_unlock_ro(fp
);
621 typedef int (*bpf_aux_classic_check_t
)(struct sock_filter
*filter
,
624 int bpf_prog_create(struct bpf_prog
**pfp
, struct sock_fprog_kern
*fprog
);
625 int bpf_prog_create_from_user(struct bpf_prog
**pfp
, struct sock_fprog
*fprog
,
626 bpf_aux_classic_check_t trans
, bool save_orig
);
627 void bpf_prog_destroy(struct bpf_prog
*fp
);
629 int sk_attach_filter(struct sock_fprog
*fprog
, struct sock
*sk
);
630 int sk_attach_bpf(u32 ufd
, struct sock
*sk
);
631 int sk_reuseport_attach_filter(struct sock_fprog
*fprog
, struct sock
*sk
);
632 int sk_reuseport_attach_bpf(u32 ufd
, struct sock
*sk
);
633 int sk_detach_filter(struct sock
*sk
);
634 int sk_get_filter(struct sock
*sk
, struct sock_filter __user
*filter
,
637 bool sk_filter_charge(struct sock
*sk
, struct sk_filter
*fp
);
638 void sk_filter_uncharge(struct sock
*sk
, struct sk_filter
*fp
);
640 u64
__bpf_call_base(u64 r1
, u64 r2
, u64 r3
, u64 r4
, u64 r5
);
642 struct bpf_prog
*bpf_int_jit_compile(struct bpf_prog
*prog
);
643 void bpf_jit_compile(struct bpf_prog
*prog
);
644 bool bpf_helper_changes_pkt_data(void *func
);
646 struct bpf_prog
*bpf_patch_insn_single(struct bpf_prog
*prog
, u32 off
,
647 const struct bpf_insn
*patch
, u32 len
);
648 void bpf_warn_invalid_xdp_action(u32 act
);
650 #ifdef CONFIG_BPF_JIT
651 extern int bpf_jit_enable
;
652 extern int bpf_jit_harden
;
653 extern int bpf_jit_kallsyms
;
655 typedef void (*bpf_jit_fill_hole_t
)(void *area
, unsigned int size
);
657 struct bpf_binary_header
*
658 bpf_jit_binary_alloc(unsigned int proglen
, u8
**image_ptr
,
659 unsigned int alignment
,
660 bpf_jit_fill_hole_t bpf_fill_ill_insns
);
661 void bpf_jit_binary_free(struct bpf_binary_header
*hdr
);
663 void bpf_jit_free(struct bpf_prog
*fp
);
665 struct bpf_prog
*bpf_jit_blind_constants(struct bpf_prog
*fp
);
666 void bpf_jit_prog_release_other(struct bpf_prog
*fp
, struct bpf_prog
*fp_other
);
668 static inline void bpf_jit_dump(unsigned int flen
, unsigned int proglen
,
669 u32 pass
, void *image
)
671 pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen
,
672 proglen
, pass
, image
, current
->comm
, task_pid_nr(current
));
675 print_hex_dump(KERN_ERR
, "JIT code: ", DUMP_PREFIX_OFFSET
,
676 16, 1, image
, proglen
, false);
679 static inline bool bpf_jit_is_ebpf(void)
681 # ifdef CONFIG_HAVE_EBPF_JIT
688 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog
*fp
)
690 return fp
->jited
&& bpf_jit_is_ebpf();
693 static inline bool bpf_jit_blinding_enabled(void)
695 /* These are the prerequisites, should someone ever have the
696 * idea to call blinding outside of them, we make sure to
699 if (!bpf_jit_is_ebpf())
705 if (bpf_jit_harden
== 1 && capable(CAP_SYS_ADMIN
))
711 static inline bool bpf_jit_kallsyms_enabled(void)
713 /* There are a couple of corner cases where kallsyms should
714 * not be enabled f.e. on hardening.
718 if (!bpf_jit_kallsyms
)
720 if (bpf_jit_kallsyms
== 1)
726 const char *__bpf_address_lookup(unsigned long addr
, unsigned long *size
,
727 unsigned long *off
, char *sym
);
728 bool is_bpf_text_address(unsigned long addr
);
729 int bpf_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
732 static inline const char *
733 bpf_address_lookup(unsigned long addr
, unsigned long *size
,
734 unsigned long *off
, char **modname
, char *sym
)
736 const char *ret
= __bpf_address_lookup(addr
, size
, off
, sym
);
743 void bpf_prog_kallsyms_add(struct bpf_prog
*fp
);
744 void bpf_prog_kallsyms_del(struct bpf_prog
*fp
);
746 #else /* CONFIG_BPF_JIT */
748 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog
*fp
)
753 static inline void bpf_jit_free(struct bpf_prog
*fp
)
755 bpf_prog_unlock_free(fp
);
758 static inline bool bpf_jit_kallsyms_enabled(void)
763 static inline const char *
764 __bpf_address_lookup(unsigned long addr
, unsigned long *size
,
765 unsigned long *off
, char *sym
)
770 static inline bool is_bpf_text_address(unsigned long addr
)
775 static inline int bpf_get_kallsym(unsigned int symnum
, unsigned long *value
,
776 char *type
, char *sym
)
781 static inline const char *
782 bpf_address_lookup(unsigned long addr
, unsigned long *size
,
783 unsigned long *off
, char **modname
, char *sym
)
788 static inline void bpf_prog_kallsyms_add(struct bpf_prog
*fp
)
792 static inline void bpf_prog_kallsyms_del(struct bpf_prog
*fp
)
795 #endif /* CONFIG_BPF_JIT */
797 #define BPF_ANC BIT(15)
799 static inline bool bpf_needs_clear_a(const struct sock_filter
*first
)
801 switch (first
->code
) {
802 case BPF_RET
| BPF_K
:
803 case BPF_LD
| BPF_W
| BPF_LEN
:
806 case BPF_LD
| BPF_W
| BPF_ABS
:
807 case BPF_LD
| BPF_H
| BPF_ABS
:
808 case BPF_LD
| BPF_B
| BPF_ABS
:
809 if (first
->k
== SKF_AD_OFF
+ SKF_AD_ALU_XOR_X
)
818 static inline u16
bpf_anc_helper(const struct sock_filter
*ftest
)
820 BUG_ON(ftest
->code
& BPF_ANC
);
822 switch (ftest
->code
) {
823 case BPF_LD
| BPF_W
| BPF_ABS
:
824 case BPF_LD
| BPF_H
| BPF_ABS
:
825 case BPF_LD
| BPF_B
| BPF_ABS
:
826 #define BPF_ANCILLARY(CODE) case SKF_AD_OFF + SKF_AD_##CODE: \
827 return BPF_ANC | SKF_AD_##CODE
829 BPF_ANCILLARY(PROTOCOL
);
830 BPF_ANCILLARY(PKTTYPE
);
831 BPF_ANCILLARY(IFINDEX
);
832 BPF_ANCILLARY(NLATTR
);
833 BPF_ANCILLARY(NLATTR_NEST
);
835 BPF_ANCILLARY(QUEUE
);
836 BPF_ANCILLARY(HATYPE
);
837 BPF_ANCILLARY(RXHASH
);
839 BPF_ANCILLARY(ALU_XOR_X
);
840 BPF_ANCILLARY(VLAN_TAG
);
841 BPF_ANCILLARY(VLAN_TAG_PRESENT
);
842 BPF_ANCILLARY(PAY_OFFSET
);
843 BPF_ANCILLARY(RANDOM
);
844 BPF_ANCILLARY(VLAN_TPID
);
852 void *bpf_internal_load_pointer_neg_helper(const struct sk_buff
*skb
,
853 int k
, unsigned int size
);
855 static inline void *bpf_load_pointer(const struct sk_buff
*skb
, int k
,
856 unsigned int size
, void *buffer
)
859 return skb_header_pointer(skb
, k
, size
, buffer
);
861 return bpf_internal_load_pointer_neg_helper(skb
, k
, size
);
864 static inline int bpf_tell_extensions(void)
869 #endif /* __LINUX_FILTER_H__ */