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 #include <asm/cacheflush.h>
24 #include <uapi/linux/filter.h>
25 #include <uapi/linux/bpf.h>
32 /* ArgX, context and stack frame pointer register positions. Note,
33 * Arg1, Arg2, Arg3, etc are used as argument mappings of function
34 * calls in BPF_CALL instruction.
36 #define BPF_REG_ARG1 BPF_REG_1
37 #define BPF_REG_ARG2 BPF_REG_2
38 #define BPF_REG_ARG3 BPF_REG_3
39 #define BPF_REG_ARG4 BPF_REG_4
40 #define BPF_REG_ARG5 BPF_REG_5
41 #define BPF_REG_CTX BPF_REG_6
42 #define BPF_REG_FP BPF_REG_10
44 /* Additional register mappings for converted user programs. */
45 #define BPF_REG_A BPF_REG_0
46 #define BPF_REG_X BPF_REG_7
47 #define BPF_REG_TMP BPF_REG_8
49 /* Kernel hidden auxiliary/helper register for hardening step.
50 * Only used by eBPF JITs. It's nothing more than a temporary
51 * register that JITs use internally, only that here it's part
52 * of eBPF instructions that have been rewritten for blinding
53 * constants. See JIT pre-step in bpf_jit_blind_constants().
55 #define BPF_REG_AX MAX_BPF_REG
56 #define MAX_BPF_JIT_REG (MAX_BPF_REG + 1)
58 /* As per nm, we expose JITed images as text (code) section for
59 * kallsyms. That way, tools like perf can find it to match
62 #define BPF_SYM_ELF_TYPE 't'
64 /* BPF program can access up to 512 bytes of stack space. */
65 #define MAX_BPF_STACK 512
67 #define BPF_TAG_SIZE 8
69 /* Helper macros for filter block array initializers. */
71 /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
73 #define BPF_ALU64_REG(OP, DST, SRC) \
74 ((struct bpf_insn) { \
75 .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \
81 #define BPF_ALU32_REG(OP, DST, SRC) \
82 ((struct bpf_insn) { \
83 .code = BPF_ALU | BPF_OP(OP) | BPF_X, \
89 /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
91 #define BPF_ALU64_IMM(OP, DST, IMM) \
92 ((struct bpf_insn) { \
93 .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \
99 #define BPF_ALU32_IMM(OP, DST, IMM) \
100 ((struct bpf_insn) { \
101 .code = BPF_ALU | BPF_OP(OP) | BPF_K, \
107 /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */
109 #define BPF_ENDIAN(TYPE, DST, LEN) \
110 ((struct bpf_insn) { \
111 .code = BPF_ALU | BPF_END | BPF_SRC(TYPE), \
117 /* Short form of mov, dst_reg = src_reg */
119 #define BPF_MOV64_REG(DST, SRC) \
120 ((struct bpf_insn) { \
121 .code = BPF_ALU64 | BPF_MOV | BPF_X, \
127 #define BPF_MOV32_REG(DST, SRC) \
128 ((struct bpf_insn) { \
129 .code = BPF_ALU | BPF_MOV | BPF_X, \
135 /* Short form of mov, dst_reg = imm32 */
137 #define BPF_MOV64_IMM(DST, IMM) \
138 ((struct bpf_insn) { \
139 .code = BPF_ALU64 | BPF_MOV | BPF_K, \
145 #define BPF_MOV32_IMM(DST, IMM) \
146 ((struct bpf_insn) { \
147 .code = BPF_ALU | BPF_MOV | BPF_K, \
153 /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
154 #define BPF_LD_IMM64(DST, IMM) \
155 BPF_LD_IMM64_RAW(DST, 0, IMM)
157 #define BPF_LD_IMM64_RAW(DST, SRC, IMM) \
158 ((struct bpf_insn) { \
159 .code = BPF_LD | BPF_DW | BPF_IMM, \
163 .imm = (__u32) (IMM) }), \
164 ((struct bpf_insn) { \
165 .code = 0, /* zero is reserved opcode */ \
169 .imm = ((__u64) (IMM)) >> 32 })
171 /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
172 #define BPF_LD_MAP_FD(DST, MAP_FD) \
173 BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
175 /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */
177 #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \
178 ((struct bpf_insn) { \
179 .code = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE), \
185 #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM) \
186 ((struct bpf_insn) { \
187 .code = BPF_ALU | BPF_MOV | BPF_SRC(TYPE), \
193 /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
195 #define BPF_LD_ABS(SIZE, IMM) \
196 ((struct bpf_insn) { \
197 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \
203 /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */
205 #define BPF_LD_IND(SIZE, SRC, IMM) \
206 ((struct bpf_insn) { \
207 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_IND, \
213 /* Memory load, dst_reg = *(uint *) (src_reg + off16) */
215 #define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \
216 ((struct bpf_insn) { \
217 .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \
223 /* Memory store, *(uint *) (dst_reg + off16) = src_reg */
225 #define BPF_STX_MEM(SIZE, DST, SRC, OFF) \
226 ((struct bpf_insn) { \
227 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \
233 /* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */
235 #define BPF_STX_XADD(SIZE, DST, SRC, OFF) \
236 ((struct bpf_insn) { \
237 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD, \
243 /* Memory store, *(uint *) (dst_reg + off16) = imm32 */
245 #define BPF_ST_MEM(SIZE, DST, OFF, IMM) \
246 ((struct bpf_insn) { \
247 .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \
253 /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
255 #define BPF_JMP_REG(OP, DST, SRC, OFF) \
256 ((struct bpf_insn) { \
257 .code = BPF_JMP | BPF_OP(OP) | BPF_X, \
263 /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
265 #define BPF_JMP_IMM(OP, DST, IMM, OFF) \
266 ((struct bpf_insn) { \
267 .code = BPF_JMP | BPF_OP(OP) | BPF_K, \
275 #define BPF_EMIT_CALL(FUNC) \
276 ((struct bpf_insn) { \
277 .code = BPF_JMP | BPF_CALL, \
281 .imm = ((FUNC) - __bpf_call_base) })
283 /* Raw code statement block */
285 #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \
286 ((struct bpf_insn) { \
295 #define BPF_EXIT_INSN() \
296 ((struct bpf_insn) { \
297 .code = BPF_JMP | BPF_EXIT, \
303 /* Internal classic blocks for direct assignment */
305 #define __BPF_STMT(CODE, K) \
306 ((struct sock_filter) BPF_STMT(CODE, K))
308 #define __BPF_JUMP(CODE, K, JT, JF) \
309 ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF))
311 #define bytes_to_bpf_size(bytes) \
313 int bpf_size = -EINVAL; \
315 if (bytes == sizeof(u8)) \
317 else if (bytes == sizeof(u16)) \
319 else if (bytes == sizeof(u32)) \
321 else if (bytes == sizeof(u64)) \
327 #define BPF_SIZEOF(type) \
329 const int __size = bytes_to_bpf_size(sizeof(type)); \
330 BUILD_BUG_ON(__size < 0); \
334 #define BPF_FIELD_SIZEOF(type, field) \
336 const int __size = bytes_to_bpf_size(FIELD_SIZEOF(type, field)); \
337 BUILD_BUG_ON(__size < 0); \
341 #define __BPF_MAP_0(m, v, ...) v
342 #define __BPF_MAP_1(m, v, t, a, ...) m(t, a)
343 #define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__)
344 #define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__)
345 #define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__)
346 #define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__)
348 #define __BPF_REG_0(...) __BPF_PAD(5)
349 #define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4)
350 #define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3)
351 #define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2)
352 #define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1)
353 #define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__)
355 #define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__)
356 #define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__)
358 #define __BPF_CAST(t, a) \
361 typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long), \
362 (unsigned long)0, (t)0))) a
366 #define __BPF_DECL_ARGS(t, a) t a
367 #define __BPF_DECL_REGS(t, a) u64 a
369 #define __BPF_PAD(n) \
370 __BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2, \
371 u64, __ur_3, u64, __ur_4, u64, __ur_5)
373 #define BPF_CALL_x(x, name, ...) \
374 static __always_inline \
375 u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)); \
376 u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)); \
377 u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)) \
379 return ____##name(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\
381 static __always_inline \
382 u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__))
384 #define BPF_CALL_0(name, ...) BPF_CALL_x(0, name, __VA_ARGS__)
385 #define BPF_CALL_1(name, ...) BPF_CALL_x(1, name, __VA_ARGS__)
386 #define BPF_CALL_2(name, ...) BPF_CALL_x(2, name, __VA_ARGS__)
387 #define BPF_CALL_3(name, ...) BPF_CALL_x(3, name, __VA_ARGS__)
388 #define BPF_CALL_4(name, ...) BPF_CALL_x(4, name, __VA_ARGS__)
389 #define BPF_CALL_5(name, ...) BPF_CALL_x(5, name, __VA_ARGS__)
392 /* A struct sock_filter is architecture independent. */
393 struct compat_sock_fprog
{
395 compat_uptr_t filter
; /* struct sock_filter * */
399 struct sock_fprog_kern
{
401 struct sock_filter
*filter
;
404 struct bpf_binary_header
{
410 u16 pages
; /* Number of allocated pages */
411 kmemcheck_bitfield_begin(meta
);
412 u16 jited
:1, /* Is our filter JIT'ed? */
413 locked
:1, /* Program image locked? */
414 gpl_compatible
:1, /* Is filter GPL compatible? */
415 cb_access
:1, /* Is control block accessed? */
416 dst_needed
:1; /* Do we need dst entry? */
417 kmemcheck_bitfield_end(meta
);
418 enum bpf_prog_type type
; /* Type of BPF program */
419 u32 len
; /* Number of filter blocks */
420 u8 tag
[BPF_TAG_SIZE
];
421 struct bpf_prog_aux
*aux
; /* Auxiliary fields */
422 struct sock_fprog_kern
*orig_prog
; /* Original BPF program */
423 unsigned int (*bpf_func
)(const void *ctx
,
424 const struct bpf_insn
*insn
);
425 /* Instructions for interpreter */
427 struct sock_filter insns
[0];
428 struct bpf_insn insnsi
[0];
435 struct bpf_prog
*prog
;
438 #define BPF_PROG_RUN(filter, ctx) (*filter->bpf_func)(ctx, filter->insnsi)
440 #define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN
442 struct bpf_skb_data_end
{
443 struct qdisc_skb_cb qdisc_cb
;
450 void *data_hard_start
;
453 /* compute the linear packet data range [data, data_end) which
454 * will be accessed by cls_bpf, act_bpf and lwt programs
456 static inline void bpf_compute_data_end(struct sk_buff
*skb
)
458 struct bpf_skb_data_end
*cb
= (struct bpf_skb_data_end
*)skb
->cb
;
460 BUILD_BUG_ON(sizeof(*cb
) > FIELD_SIZEOF(struct sk_buff
, cb
));
461 cb
->data_end
= skb
->data
+ skb_headlen(skb
);
464 static inline u8
*bpf_skb_cb(struct sk_buff
*skb
)
466 /* eBPF programs may read/write skb->cb[] area to transfer meta
467 * data between tail calls. Since this also needs to work with
468 * tc, that scratch memory is mapped to qdisc_skb_cb's data area.
470 * In some socket filter cases, the cb unfortunately needs to be
471 * saved/restored so that protocol specific skb->cb[] data won't
472 * be lost. In any case, due to unpriviledged eBPF programs
473 * attached to sockets, we need to clear the bpf_skb_cb() area
474 * to not leak previous contents to user space.
476 BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff
, cb
) != BPF_SKB_CB_LEN
);
477 BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff
, cb
) !=
478 FIELD_SIZEOF(struct qdisc_skb_cb
, data
));
480 return qdisc_skb_cb(skb
)->data
;
483 static inline u32
bpf_prog_run_save_cb(const struct bpf_prog
*prog
,
486 u8
*cb_data
= bpf_skb_cb(skb
);
487 u8 cb_saved
[BPF_SKB_CB_LEN
];
490 if (unlikely(prog
->cb_access
)) {
491 memcpy(cb_saved
, cb_data
, sizeof(cb_saved
));
492 memset(cb_data
, 0, sizeof(cb_saved
));
495 res
= BPF_PROG_RUN(prog
, skb
);
497 if (unlikely(prog
->cb_access
))
498 memcpy(cb_data
, cb_saved
, sizeof(cb_saved
));
503 static inline u32
bpf_prog_run_clear_cb(const struct bpf_prog
*prog
,
506 u8
*cb_data
= bpf_skb_cb(skb
);
508 if (unlikely(prog
->cb_access
))
509 memset(cb_data
, 0, BPF_SKB_CB_LEN
);
511 return BPF_PROG_RUN(prog
, skb
);
514 static __always_inline u32
bpf_prog_run_xdp(const struct bpf_prog
*prog
,
515 struct xdp_buff
*xdp
)
517 /* Caller needs to hold rcu_read_lock() (!), otherwise program
518 * can be released while still running, or map elements could be
519 * freed early while still having concurrent users. XDP fastpath
520 * already takes rcu_read_lock() when fetching the program, so
521 * it's not necessary here anymore.
523 return BPF_PROG_RUN(prog
, xdp
);
526 static inline u32
bpf_prog_insn_size(const struct bpf_prog
*prog
)
528 return prog
->len
* sizeof(struct bpf_insn
);
531 static inline u32
bpf_prog_tag_scratch_size(const struct bpf_prog
*prog
)
533 return round_up(bpf_prog_insn_size(prog
) +
534 sizeof(__be64
) + 1, SHA_MESSAGE_BYTES
);
537 static inline unsigned int bpf_prog_size(unsigned int proglen
)
539 return max(sizeof(struct bpf_prog
),
540 offsetof(struct bpf_prog
, insns
[proglen
]));
543 static inline bool bpf_prog_was_classic(const struct bpf_prog
*prog
)
545 /* When classic BPF programs have been loaded and the arch
546 * does not have a classic BPF JIT (anymore), they have been
547 * converted via bpf_migrate_filter() to eBPF and thus always
548 * have an unspec program type.
550 return prog
->type
== BPF_PROG_TYPE_UNSPEC
;
553 #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
555 #ifdef CONFIG_ARCH_HAS_SET_MEMORY
556 static inline void bpf_prog_lock_ro(struct bpf_prog
*fp
)
559 WARN_ON_ONCE(set_memory_ro((unsigned long)fp
, fp
->pages
));
562 static inline void bpf_prog_unlock_ro(struct bpf_prog
*fp
)
565 WARN_ON_ONCE(set_memory_rw((unsigned long)fp
, fp
->pages
));
566 /* In case set_memory_rw() fails, we want to be the first
567 * to crash here instead of some random place later on.
573 static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header
*hdr
)
575 WARN_ON_ONCE(set_memory_ro((unsigned long)hdr
, hdr
->pages
));
578 static inline void bpf_jit_binary_unlock_ro(struct bpf_binary_header
*hdr
)
580 WARN_ON_ONCE(set_memory_rw((unsigned long)hdr
, hdr
->pages
));
583 static inline void bpf_prog_lock_ro(struct bpf_prog
*fp
)
587 static inline void bpf_prog_unlock_ro(struct bpf_prog
*fp
)
591 static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header
*hdr
)
595 static inline void bpf_jit_binary_unlock_ro(struct bpf_binary_header
*hdr
)
598 #endif /* CONFIG_ARCH_HAS_SET_MEMORY */
600 static inline struct bpf_binary_header
*
601 bpf_jit_binary_hdr(const struct bpf_prog
*fp
)
603 unsigned long real_start
= (unsigned long)fp
->bpf_func
;
604 unsigned long addr
= real_start
& PAGE_MASK
;
609 int sk_filter_trim_cap(struct sock
*sk
, struct sk_buff
*skb
, unsigned int cap
);
610 static inline int sk_filter(struct sock
*sk
, struct sk_buff
*skb
)
612 return sk_filter_trim_cap(sk
, skb
, 1);
615 struct bpf_prog
*bpf_prog_select_runtime(struct bpf_prog
*fp
, int *err
);
616 void bpf_prog_free(struct bpf_prog
*fp
);
618 struct bpf_prog
*bpf_prog_alloc(unsigned int size
, gfp_t gfp_extra_flags
);
619 struct bpf_prog
*bpf_prog_realloc(struct bpf_prog
*fp_old
, unsigned int size
,
620 gfp_t gfp_extra_flags
);
621 void __bpf_prog_free(struct bpf_prog
*fp
);
623 static inline void bpf_prog_unlock_free(struct bpf_prog
*fp
)
625 bpf_prog_unlock_ro(fp
);
629 typedef int (*bpf_aux_classic_check_t
)(struct sock_filter
*filter
,
632 int bpf_prog_create(struct bpf_prog
**pfp
, struct sock_fprog_kern
*fprog
);
633 int bpf_prog_create_from_user(struct bpf_prog
**pfp
, struct sock_fprog
*fprog
,
634 bpf_aux_classic_check_t trans
, bool save_orig
);
635 void bpf_prog_destroy(struct bpf_prog
*fp
);
637 int sk_attach_filter(struct sock_fprog
*fprog
, struct sock
*sk
);
638 int sk_attach_bpf(u32 ufd
, struct sock
*sk
);
639 int sk_reuseport_attach_filter(struct sock_fprog
*fprog
, struct sock
*sk
);
640 int sk_reuseport_attach_bpf(u32 ufd
, struct sock
*sk
);
641 int sk_detach_filter(struct sock
*sk
);
642 int sk_get_filter(struct sock
*sk
, struct sock_filter __user
*filter
,
645 bool sk_filter_charge(struct sock
*sk
, struct sk_filter
*fp
);
646 void sk_filter_uncharge(struct sock
*sk
, struct sk_filter
*fp
);
648 u64
__bpf_call_base(u64 r1
, u64 r2
, u64 r3
, u64 r4
, u64 r5
);
650 struct bpf_prog
*bpf_int_jit_compile(struct bpf_prog
*prog
);
651 void bpf_jit_compile(struct bpf_prog
*prog
);
652 bool bpf_helper_changes_pkt_data(void *func
);
654 struct bpf_prog
*bpf_patch_insn_single(struct bpf_prog
*prog
, u32 off
,
655 const struct bpf_insn
*patch
, u32 len
);
656 void bpf_warn_invalid_xdp_action(u32 act
);
658 #ifdef CONFIG_BPF_JIT
659 extern int bpf_jit_enable
;
660 extern int bpf_jit_harden
;
661 extern int bpf_jit_kallsyms
;
663 typedef void (*bpf_jit_fill_hole_t
)(void *area
, unsigned int size
);
665 struct bpf_binary_header
*
666 bpf_jit_binary_alloc(unsigned int proglen
, u8
**image_ptr
,
667 unsigned int alignment
,
668 bpf_jit_fill_hole_t bpf_fill_ill_insns
);
669 void bpf_jit_binary_free(struct bpf_binary_header
*hdr
);
671 void bpf_jit_free(struct bpf_prog
*fp
);
673 struct bpf_prog
*bpf_jit_blind_constants(struct bpf_prog
*fp
);
674 void bpf_jit_prog_release_other(struct bpf_prog
*fp
, struct bpf_prog
*fp_other
);
676 static inline void bpf_jit_dump(unsigned int flen
, unsigned int proglen
,
677 u32 pass
, void *image
)
679 pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen
,
680 proglen
, pass
, image
, current
->comm
, task_pid_nr(current
));
683 print_hex_dump(KERN_ERR
, "JIT code: ", DUMP_PREFIX_OFFSET
,
684 16, 1, image
, proglen
, false);
687 static inline bool bpf_jit_is_ebpf(void)
689 # ifdef CONFIG_HAVE_EBPF_JIT
696 static inline bool ebpf_jit_enabled(void)
698 return bpf_jit_enable
&& bpf_jit_is_ebpf();
701 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog
*fp
)
703 return fp
->jited
&& bpf_jit_is_ebpf();
706 static inline bool bpf_jit_blinding_enabled(void)
708 /* These are the prerequisites, should someone ever have the
709 * idea to call blinding outside of them, we make sure to
712 if (!bpf_jit_is_ebpf())
718 if (bpf_jit_harden
== 1 && capable(CAP_SYS_ADMIN
))
724 static inline bool bpf_jit_kallsyms_enabled(void)
726 /* There are a couple of corner cases where kallsyms should
727 * not be enabled f.e. on hardening.
731 if (!bpf_jit_kallsyms
)
733 if (bpf_jit_kallsyms
== 1)
739 const char *__bpf_address_lookup(unsigned long addr
, unsigned long *size
,
740 unsigned long *off
, char *sym
);
741 bool is_bpf_text_address(unsigned long addr
);
742 int bpf_get_kallsym(unsigned int symnum
, unsigned long *value
, char *type
,
745 static inline const char *
746 bpf_address_lookup(unsigned long addr
, unsigned long *size
,
747 unsigned long *off
, char **modname
, char *sym
)
749 const char *ret
= __bpf_address_lookup(addr
, size
, off
, sym
);
756 void bpf_prog_kallsyms_add(struct bpf_prog
*fp
);
757 void bpf_prog_kallsyms_del(struct bpf_prog
*fp
);
759 #else /* CONFIG_BPF_JIT */
761 static inline bool ebpf_jit_enabled(void)
766 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog
*fp
)
771 static inline void bpf_jit_free(struct bpf_prog
*fp
)
773 bpf_prog_unlock_free(fp
);
776 static inline bool bpf_jit_kallsyms_enabled(void)
781 static inline const char *
782 __bpf_address_lookup(unsigned long addr
, unsigned long *size
,
783 unsigned long *off
, char *sym
)
788 static inline bool is_bpf_text_address(unsigned long addr
)
793 static inline int bpf_get_kallsym(unsigned int symnum
, unsigned long *value
,
794 char *type
, char *sym
)
799 static inline const char *
800 bpf_address_lookup(unsigned long addr
, unsigned long *size
,
801 unsigned long *off
, char **modname
, char *sym
)
806 static inline void bpf_prog_kallsyms_add(struct bpf_prog
*fp
)
810 static inline void bpf_prog_kallsyms_del(struct bpf_prog
*fp
)
813 #endif /* CONFIG_BPF_JIT */
815 #define BPF_ANC BIT(15)
817 static inline bool bpf_needs_clear_a(const struct sock_filter
*first
)
819 switch (first
->code
) {
820 case BPF_RET
| BPF_K
:
821 case BPF_LD
| BPF_W
| BPF_LEN
:
824 case BPF_LD
| BPF_W
| BPF_ABS
:
825 case BPF_LD
| BPF_H
| BPF_ABS
:
826 case BPF_LD
| BPF_B
| BPF_ABS
:
827 if (first
->k
== SKF_AD_OFF
+ SKF_AD_ALU_XOR_X
)
836 static inline u16
bpf_anc_helper(const struct sock_filter
*ftest
)
838 BUG_ON(ftest
->code
& BPF_ANC
);
840 switch (ftest
->code
) {
841 case BPF_LD
| BPF_W
| BPF_ABS
:
842 case BPF_LD
| BPF_H
| BPF_ABS
:
843 case BPF_LD
| BPF_B
| BPF_ABS
:
844 #define BPF_ANCILLARY(CODE) case SKF_AD_OFF + SKF_AD_##CODE: \
845 return BPF_ANC | SKF_AD_##CODE
847 BPF_ANCILLARY(PROTOCOL
);
848 BPF_ANCILLARY(PKTTYPE
);
849 BPF_ANCILLARY(IFINDEX
);
850 BPF_ANCILLARY(NLATTR
);
851 BPF_ANCILLARY(NLATTR_NEST
);
853 BPF_ANCILLARY(QUEUE
);
854 BPF_ANCILLARY(HATYPE
);
855 BPF_ANCILLARY(RXHASH
);
857 BPF_ANCILLARY(ALU_XOR_X
);
858 BPF_ANCILLARY(VLAN_TAG
);
859 BPF_ANCILLARY(VLAN_TAG_PRESENT
);
860 BPF_ANCILLARY(PAY_OFFSET
);
861 BPF_ANCILLARY(RANDOM
);
862 BPF_ANCILLARY(VLAN_TPID
);
870 void *bpf_internal_load_pointer_neg_helper(const struct sk_buff
*skb
,
871 int k
, unsigned int size
);
873 static inline void *bpf_load_pointer(const struct sk_buff
*skb
, int k
,
874 unsigned int size
, void *buffer
)
877 return skb_header_pointer(skb
, k
, size
, buffer
);
879 return bpf_internal_load_pointer_neg_helper(skb
, k
, size
);
882 static inline int bpf_tell_extensions(void)
887 #endif /* __LINUX_FILTER_H__ */