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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux Socket Filter Data Structures | |
3 | */ | |
1da177e4 LT |
4 | #ifndef __LINUX_FILTER_H__ |
5 | #define __LINUX_FILTER_H__ | |
6 | ||
60063497 | 7 | #include <linux/atomic.h> |
0c5fe1b4 | 8 | #include <linux/compat.h> |
9f12fbe6 | 9 | #include <linux/skbuff.h> |
d45ed4a4 | 10 | #include <linux/workqueue.h> |
607ca46e | 11 | #include <uapi/linux/filter.h> |
60a3b225 | 12 | #include <asm/cacheflush.h> |
daedfb22 | 13 | #include <uapi/linux/bpf.h> |
60a3b225 DB |
14 | |
15 | struct sk_buff; | |
16 | struct sock; | |
17 | struct seccomp_data; | |
792d4b5c | 18 | |
30743837 DB |
19 | /* ArgX, context and stack frame pointer register positions. Note, |
20 | * Arg1, Arg2, Arg3, etc are used as argument mappings of function | |
21 | * calls in BPF_CALL instruction. | |
22 | */ | |
23 | #define BPF_REG_ARG1 BPF_REG_1 | |
24 | #define BPF_REG_ARG2 BPF_REG_2 | |
25 | #define BPF_REG_ARG3 BPF_REG_3 | |
26 | #define BPF_REG_ARG4 BPF_REG_4 | |
27 | #define BPF_REG_ARG5 BPF_REG_5 | |
28 | #define BPF_REG_CTX BPF_REG_6 | |
29 | #define BPF_REG_FP BPF_REG_10 | |
30 | ||
31 | /* Additional register mappings for converted user programs. */ | |
32 | #define BPF_REG_A BPF_REG_0 | |
33 | #define BPF_REG_X BPF_REG_7 | |
34 | #define BPF_REG_TMP BPF_REG_8 | |
bd4cf0ed AS |
35 | |
36 | /* BPF program can access up to 512 bytes of stack space. */ | |
37 | #define MAX_BPF_STACK 512 | |
38 | ||
f8f6d679 DB |
39 | /* Helper macros for filter block array initializers. */ |
40 | ||
e430f34e | 41 | /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */ |
f8f6d679 | 42 | |
e430f34e | 43 | #define BPF_ALU64_REG(OP, DST, SRC) \ |
2695fb55 | 44 | ((struct bpf_insn) { \ |
f8f6d679 | 45 | .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \ |
e430f34e AS |
46 | .dst_reg = DST, \ |
47 | .src_reg = SRC, \ | |
f8f6d679 DB |
48 | .off = 0, \ |
49 | .imm = 0 }) | |
50 | ||
e430f34e | 51 | #define BPF_ALU32_REG(OP, DST, SRC) \ |
2695fb55 | 52 | ((struct bpf_insn) { \ |
f8f6d679 | 53 | .code = BPF_ALU | BPF_OP(OP) | BPF_X, \ |
e430f34e AS |
54 | .dst_reg = DST, \ |
55 | .src_reg = SRC, \ | |
f8f6d679 DB |
56 | .off = 0, \ |
57 | .imm = 0 }) | |
58 | ||
e430f34e | 59 | /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */ |
f8f6d679 | 60 | |
e430f34e | 61 | #define BPF_ALU64_IMM(OP, DST, IMM) \ |
2695fb55 | 62 | ((struct bpf_insn) { \ |
f8f6d679 | 63 | .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
64 | .dst_reg = DST, \ |
65 | .src_reg = 0, \ | |
f8f6d679 DB |
66 | .off = 0, \ |
67 | .imm = IMM }) | |
68 | ||
e430f34e | 69 | #define BPF_ALU32_IMM(OP, DST, IMM) \ |
2695fb55 | 70 | ((struct bpf_insn) { \ |
f8f6d679 | 71 | .code = BPF_ALU | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
72 | .dst_reg = DST, \ |
73 | .src_reg = 0, \ | |
f8f6d679 DB |
74 | .off = 0, \ |
75 | .imm = IMM }) | |
76 | ||
77 | /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */ | |
78 | ||
e430f34e | 79 | #define BPF_ENDIAN(TYPE, DST, LEN) \ |
2695fb55 | 80 | ((struct bpf_insn) { \ |
f8f6d679 | 81 | .code = BPF_ALU | BPF_END | BPF_SRC(TYPE), \ |
e430f34e AS |
82 | .dst_reg = DST, \ |
83 | .src_reg = 0, \ | |
f8f6d679 DB |
84 | .off = 0, \ |
85 | .imm = LEN }) | |
86 | ||
e430f34e | 87 | /* Short form of mov, dst_reg = src_reg */ |
f8f6d679 | 88 | |
e430f34e | 89 | #define BPF_MOV64_REG(DST, SRC) \ |
2695fb55 | 90 | ((struct bpf_insn) { \ |
f8f6d679 | 91 | .code = BPF_ALU64 | BPF_MOV | BPF_X, \ |
e430f34e AS |
92 | .dst_reg = DST, \ |
93 | .src_reg = SRC, \ | |
f8f6d679 DB |
94 | .off = 0, \ |
95 | .imm = 0 }) | |
96 | ||
e430f34e | 97 | #define BPF_MOV32_REG(DST, SRC) \ |
2695fb55 | 98 | ((struct bpf_insn) { \ |
f8f6d679 | 99 | .code = BPF_ALU | BPF_MOV | BPF_X, \ |
e430f34e AS |
100 | .dst_reg = DST, \ |
101 | .src_reg = SRC, \ | |
f8f6d679 DB |
102 | .off = 0, \ |
103 | .imm = 0 }) | |
104 | ||
e430f34e | 105 | /* Short form of mov, dst_reg = imm32 */ |
f8f6d679 | 106 | |
e430f34e | 107 | #define BPF_MOV64_IMM(DST, IMM) \ |
2695fb55 | 108 | ((struct bpf_insn) { \ |
f8f6d679 | 109 | .code = BPF_ALU64 | BPF_MOV | BPF_K, \ |
e430f34e AS |
110 | .dst_reg = DST, \ |
111 | .src_reg = 0, \ | |
f8f6d679 DB |
112 | .off = 0, \ |
113 | .imm = IMM }) | |
114 | ||
e430f34e | 115 | #define BPF_MOV32_IMM(DST, IMM) \ |
2695fb55 | 116 | ((struct bpf_insn) { \ |
f8f6d679 | 117 | .code = BPF_ALU | BPF_MOV | BPF_K, \ |
e430f34e AS |
118 | .dst_reg = DST, \ |
119 | .src_reg = 0, \ | |
f8f6d679 DB |
120 | .off = 0, \ |
121 | .imm = IMM }) | |
122 | ||
02ab695b AS |
123 | /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */ |
124 | #define BPF_LD_IMM64(DST, IMM) \ | |
125 | BPF_LD_IMM64_RAW(DST, 0, IMM) | |
126 | ||
127 | #define BPF_LD_IMM64_RAW(DST, SRC, IMM) \ | |
128 | ((struct bpf_insn) { \ | |
129 | .code = BPF_LD | BPF_DW | BPF_IMM, \ | |
130 | .dst_reg = DST, \ | |
131 | .src_reg = SRC, \ | |
132 | .off = 0, \ | |
133 | .imm = (__u32) (IMM) }), \ | |
134 | ((struct bpf_insn) { \ | |
135 | .code = 0, /* zero is reserved opcode */ \ | |
136 | .dst_reg = 0, \ | |
137 | .src_reg = 0, \ | |
138 | .off = 0, \ | |
139 | .imm = ((__u64) (IMM)) >> 32 }) | |
140 | ||
e430f34e | 141 | /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */ |
f8f6d679 | 142 | |
e430f34e | 143 | #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \ |
2695fb55 | 144 | ((struct bpf_insn) { \ |
f8f6d679 | 145 | .code = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE), \ |
e430f34e AS |
146 | .dst_reg = DST, \ |
147 | .src_reg = SRC, \ | |
f8f6d679 DB |
148 | .off = 0, \ |
149 | .imm = IMM }) | |
150 | ||
e430f34e | 151 | #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM) \ |
2695fb55 | 152 | ((struct bpf_insn) { \ |
f8f6d679 | 153 | .code = BPF_ALU | BPF_MOV | BPF_SRC(TYPE), \ |
e430f34e AS |
154 | .dst_reg = DST, \ |
155 | .src_reg = SRC, \ | |
f8f6d679 DB |
156 | .off = 0, \ |
157 | .imm = IMM }) | |
158 | ||
e430f34e | 159 | /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */ |
f8f6d679 | 160 | |
e430f34e | 161 | #define BPF_LD_ABS(SIZE, IMM) \ |
2695fb55 | 162 | ((struct bpf_insn) { \ |
f8f6d679 | 163 | .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \ |
e430f34e AS |
164 | .dst_reg = 0, \ |
165 | .src_reg = 0, \ | |
f8f6d679 | 166 | .off = 0, \ |
e430f34e | 167 | .imm = IMM }) |
f8f6d679 | 168 | |
e430f34e | 169 | /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */ |
f8f6d679 | 170 | |
e430f34e | 171 | #define BPF_LD_IND(SIZE, SRC, IMM) \ |
2695fb55 | 172 | ((struct bpf_insn) { \ |
f8f6d679 | 173 | .code = BPF_LD | BPF_SIZE(SIZE) | BPF_IND, \ |
e430f34e AS |
174 | .dst_reg = 0, \ |
175 | .src_reg = SRC, \ | |
f8f6d679 | 176 | .off = 0, \ |
e430f34e | 177 | .imm = IMM }) |
f8f6d679 | 178 | |
e430f34e | 179 | /* Memory load, dst_reg = *(uint *) (src_reg + off16) */ |
f8f6d679 | 180 | |
e430f34e | 181 | #define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \ |
2695fb55 | 182 | ((struct bpf_insn) { \ |
f8f6d679 | 183 | .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \ |
e430f34e AS |
184 | .dst_reg = DST, \ |
185 | .src_reg = SRC, \ | |
f8f6d679 DB |
186 | .off = OFF, \ |
187 | .imm = 0 }) | |
188 | ||
e430f34e AS |
189 | /* Memory store, *(uint *) (dst_reg + off16) = src_reg */ |
190 | ||
191 | #define BPF_STX_MEM(SIZE, DST, SRC, OFF) \ | |
2695fb55 | 192 | ((struct bpf_insn) { \ |
f8f6d679 | 193 | .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \ |
e430f34e AS |
194 | .dst_reg = DST, \ |
195 | .src_reg = SRC, \ | |
f8f6d679 DB |
196 | .off = OFF, \ |
197 | .imm = 0 }) | |
198 | ||
e430f34e AS |
199 | /* Memory store, *(uint *) (dst_reg + off16) = imm32 */ |
200 | ||
201 | #define BPF_ST_MEM(SIZE, DST, OFF, IMM) \ | |
2695fb55 | 202 | ((struct bpf_insn) { \ |
e430f34e AS |
203 | .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \ |
204 | .dst_reg = DST, \ | |
205 | .src_reg = 0, \ | |
206 | .off = OFF, \ | |
207 | .imm = IMM }) | |
208 | ||
209 | /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */ | |
f8f6d679 | 210 | |
e430f34e | 211 | #define BPF_JMP_REG(OP, DST, SRC, OFF) \ |
2695fb55 | 212 | ((struct bpf_insn) { \ |
f8f6d679 | 213 | .code = BPF_JMP | BPF_OP(OP) | BPF_X, \ |
e430f34e AS |
214 | .dst_reg = DST, \ |
215 | .src_reg = SRC, \ | |
f8f6d679 DB |
216 | .off = OFF, \ |
217 | .imm = 0 }) | |
218 | ||
e430f34e | 219 | /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */ |
f8f6d679 | 220 | |
e430f34e | 221 | #define BPF_JMP_IMM(OP, DST, IMM, OFF) \ |
2695fb55 | 222 | ((struct bpf_insn) { \ |
f8f6d679 | 223 | .code = BPF_JMP | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
224 | .dst_reg = DST, \ |
225 | .src_reg = 0, \ | |
f8f6d679 DB |
226 | .off = OFF, \ |
227 | .imm = IMM }) | |
228 | ||
229 | /* Function call */ | |
230 | ||
231 | #define BPF_EMIT_CALL(FUNC) \ | |
2695fb55 | 232 | ((struct bpf_insn) { \ |
f8f6d679 | 233 | .code = BPF_JMP | BPF_CALL, \ |
e430f34e AS |
234 | .dst_reg = 0, \ |
235 | .src_reg = 0, \ | |
f8f6d679 DB |
236 | .off = 0, \ |
237 | .imm = ((FUNC) - __bpf_call_base) }) | |
238 | ||
239 | /* Raw code statement block */ | |
240 | ||
e430f34e | 241 | #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \ |
2695fb55 | 242 | ((struct bpf_insn) { \ |
f8f6d679 | 243 | .code = CODE, \ |
e430f34e AS |
244 | .dst_reg = DST, \ |
245 | .src_reg = SRC, \ | |
f8f6d679 DB |
246 | .off = OFF, \ |
247 | .imm = IMM }) | |
248 | ||
249 | /* Program exit */ | |
250 | ||
251 | #define BPF_EXIT_INSN() \ | |
2695fb55 | 252 | ((struct bpf_insn) { \ |
f8f6d679 | 253 | .code = BPF_JMP | BPF_EXIT, \ |
e430f34e AS |
254 | .dst_reg = 0, \ |
255 | .src_reg = 0, \ | |
f8f6d679 DB |
256 | .off = 0, \ |
257 | .imm = 0 }) | |
258 | ||
259 | #define bytes_to_bpf_size(bytes) \ | |
260 | ({ \ | |
261 | int bpf_size = -EINVAL; \ | |
262 | \ | |
263 | if (bytes == sizeof(u8)) \ | |
264 | bpf_size = BPF_B; \ | |
265 | else if (bytes == sizeof(u16)) \ | |
266 | bpf_size = BPF_H; \ | |
267 | else if (bytes == sizeof(u32)) \ | |
268 | bpf_size = BPF_W; \ | |
269 | else if (bytes == sizeof(u64)) \ | |
270 | bpf_size = BPF_DW; \ | |
271 | \ | |
272 | bpf_size; \ | |
273 | }) | |
9739eef1 | 274 | |
30743837 | 275 | /* Macro to invoke filter function. */ |
7ae457c1 AS |
276 | #define SK_RUN_FILTER(filter, ctx) \ |
277 | (*filter->prog->bpf_func)(ctx, filter->prog->insnsi) | |
bd4cf0ed | 278 | |
bd4cf0ed AS |
279 | #ifdef CONFIG_COMPAT |
280 | /* A struct sock_filter is architecture independent. */ | |
0c5fe1b4 WD |
281 | struct compat_sock_fprog { |
282 | u16 len; | |
bd4cf0ed | 283 | compat_uptr_t filter; /* struct sock_filter * */ |
0c5fe1b4 WD |
284 | }; |
285 | #endif | |
286 | ||
a3ea269b DB |
287 | struct sock_fprog_kern { |
288 | u16 len; | |
289 | struct sock_filter *filter; | |
290 | }; | |
291 | ||
738cbe72 DB |
292 | struct bpf_binary_header { |
293 | unsigned int pages; | |
294 | u8 image[]; | |
295 | }; | |
296 | ||
60a3b225 DB |
297 | struct bpf_work_struct { |
298 | struct bpf_prog *prog; | |
299 | struct work_struct work; | |
300 | }; | |
792d4b5c | 301 | |
7ae457c1 | 302 | struct bpf_prog { |
286aad3c DB |
303 | u16 pages; /* Number of allocated pages */ |
304 | bool jited; /* Is our filter JIT'ed? */ | |
305 | u32 len; /* Number of filter blocks */ | |
a3ea269b | 306 | struct sock_fprog_kern *orig_prog; /* Original BPF program */ |
60a3b225 | 307 | struct bpf_work_struct *work; /* Deferred free work struct */ |
0a14842f | 308 | unsigned int (*bpf_func)(const struct sk_buff *skb, |
2695fb55 | 309 | const struct bpf_insn *filter); |
60a3b225 | 310 | /* Instructions for interpreter */ |
d45ed4a4 | 311 | union { |
bd4cf0ed | 312 | struct sock_filter insns[0]; |
2695fb55 | 313 | struct bpf_insn insnsi[0]; |
d45ed4a4 | 314 | }; |
b715631f SH |
315 | }; |
316 | ||
7ae457c1 AS |
317 | struct sk_filter { |
318 | atomic_t refcnt; | |
319 | struct rcu_head rcu; | |
320 | struct bpf_prog *prog; | |
321 | }; | |
322 | ||
323 | #define BPF_PROG_RUN(filter, ctx) (*filter->bpf_func)(ctx, filter->insnsi) | |
324 | ||
325 | static inline unsigned int bpf_prog_size(unsigned int proglen) | |
b715631f | 326 | { |
7ae457c1 AS |
327 | return max(sizeof(struct bpf_prog), |
328 | offsetof(struct bpf_prog, insns[proglen])); | |
b715631f SH |
329 | } |
330 | ||
009937e7 | 331 | #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0])) |
a3ea269b | 332 | |
60a3b225 DB |
333 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
334 | static inline void bpf_prog_lock_ro(struct bpf_prog *fp) | |
335 | { | |
336 | set_memory_ro((unsigned long)fp, fp->pages); | |
337 | } | |
338 | ||
339 | static inline void bpf_prog_unlock_ro(struct bpf_prog *fp) | |
340 | { | |
341 | set_memory_rw((unsigned long)fp, fp->pages); | |
342 | } | |
343 | #else | |
344 | static inline void bpf_prog_lock_ro(struct bpf_prog *fp) | |
345 | { | |
346 | } | |
347 | ||
348 | static inline void bpf_prog_unlock_ro(struct bpf_prog *fp) | |
349 | { | |
350 | } | |
351 | #endif /* CONFIG_DEBUG_SET_MODULE_RONX */ | |
352 | ||
fbc907f0 | 353 | int sk_filter(struct sock *sk, struct sk_buff *skb); |
bd4cf0ed | 354 | |
7ae457c1 AS |
355 | void bpf_prog_select_runtime(struct bpf_prog *fp); |
356 | void bpf_prog_free(struct bpf_prog *fp); | |
bd4cf0ed | 357 | |
8fb575ca AS |
358 | int bpf_convert_filter(struct sock_filter *prog, int len, |
359 | struct bpf_insn *new_prog, int *new_len); | |
a3ea269b | 360 | |
60a3b225 DB |
361 | struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags); |
362 | struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size, | |
363 | gfp_t gfp_extra_flags); | |
364 | void __bpf_prog_free(struct bpf_prog *fp); | |
365 | ||
738cbe72 DB |
366 | typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size); |
367 | ||
368 | struct bpf_binary_header * | |
369 | bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, | |
370 | unsigned int alignment, | |
371 | bpf_jit_fill_hole_t bpf_fill_ill_insns); | |
372 | void bpf_jit_binary_free(struct bpf_binary_header *hdr); | |
373 | ||
60a3b225 DB |
374 | static inline void bpf_prog_unlock_free(struct bpf_prog *fp) |
375 | { | |
376 | bpf_prog_unlock_ro(fp); | |
377 | __bpf_prog_free(fp); | |
378 | } | |
379 | ||
7ae457c1 AS |
380 | int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog); |
381 | void bpf_prog_destroy(struct bpf_prog *fp); | |
a3ea269b | 382 | |
fbc907f0 DB |
383 | int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk); |
384 | int sk_detach_filter(struct sock *sk); | |
a3ea269b | 385 | |
4df95ff4 | 386 | int bpf_check_classic(const struct sock_filter *filter, unsigned int flen); |
fbc907f0 DB |
387 | int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, |
388 | unsigned int len); | |
fbc907f0 | 389 | |
278571ba | 390 | bool sk_filter_charge(struct sock *sk, struct sk_filter *fp); |
fbc907f0 | 391 | void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp); |
0a14842f | 392 | |
62258278 | 393 | u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); |
7ae457c1 | 394 | void bpf_int_jit_compile(struct bpf_prog *fp); |
62258278 | 395 | |
34805931 DB |
396 | #define BPF_ANC BIT(15) |
397 | ||
398 | static inline u16 bpf_anc_helper(const struct sock_filter *ftest) | |
399 | { | |
400 | BUG_ON(ftest->code & BPF_ANC); | |
401 | ||
402 | switch (ftest->code) { | |
403 | case BPF_LD | BPF_W | BPF_ABS: | |
404 | case BPF_LD | BPF_H | BPF_ABS: | |
405 | case BPF_LD | BPF_B | BPF_ABS: | |
406 | #define BPF_ANCILLARY(CODE) case SKF_AD_OFF + SKF_AD_##CODE: \ | |
407 | return BPF_ANC | SKF_AD_##CODE | |
408 | switch (ftest->k) { | |
409 | BPF_ANCILLARY(PROTOCOL); | |
410 | BPF_ANCILLARY(PKTTYPE); | |
411 | BPF_ANCILLARY(IFINDEX); | |
412 | BPF_ANCILLARY(NLATTR); | |
413 | BPF_ANCILLARY(NLATTR_NEST); | |
414 | BPF_ANCILLARY(MARK); | |
415 | BPF_ANCILLARY(QUEUE); | |
416 | BPF_ANCILLARY(HATYPE); | |
417 | BPF_ANCILLARY(RXHASH); | |
418 | BPF_ANCILLARY(CPU); | |
419 | BPF_ANCILLARY(ALU_XOR_X); | |
420 | BPF_ANCILLARY(VLAN_TAG); | |
421 | BPF_ANCILLARY(VLAN_TAG_PRESENT); | |
422 | BPF_ANCILLARY(PAY_OFFSET); | |
423 | BPF_ANCILLARY(RANDOM); | |
424 | } | |
425 | /* Fallthrough. */ | |
426 | default: | |
427 | return ftest->code; | |
428 | } | |
429 | } | |
430 | ||
9f12fbe6 ZSL |
431 | void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb, |
432 | int k, unsigned int size); | |
433 | ||
434 | static inline void *bpf_load_pointer(const struct sk_buff *skb, int k, | |
435 | unsigned int size, void *buffer) | |
436 | { | |
437 | if (k >= 0) | |
438 | return skb_header_pointer(skb, k, size, buffer); | |
439 | ||
440 | return bpf_internal_load_pointer_neg_helper(skb, k, size); | |
441 | } | |
442 | ||
0a14842f | 443 | #ifdef CONFIG_BPF_JIT |
20074f35 | 444 | #include <stdarg.h> |
a691ce7f CG |
445 | #include <linux/linkage.h> |
446 | #include <linux/printk.h> | |
447 | ||
7ae457c1 AS |
448 | void bpf_jit_compile(struct bpf_prog *fp); |
449 | void bpf_jit_free(struct bpf_prog *fp); | |
79617801 DB |
450 | |
451 | static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen, | |
452 | u32 pass, void *image) | |
453 | { | |
16495445 | 454 | pr_err("flen=%u proglen=%u pass=%u image=%pK\n", |
79617801 DB |
455 | flen, proglen, pass, image); |
456 | if (image) | |
16495445 | 457 | print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET, |
79617801 DB |
458 | 16, 1, image, proglen, false); |
459 | } | |
0a14842f | 460 | #else |
d45ed4a4 | 461 | #include <linux/slab.h> |
34805931 | 462 | |
7ae457c1 | 463 | static inline void bpf_jit_compile(struct bpf_prog *fp) |
0a14842f ED |
464 | { |
465 | } | |
34805931 | 466 | |
7ae457c1 | 467 | static inline void bpf_jit_free(struct bpf_prog *fp) |
0a14842f | 468 | { |
60a3b225 | 469 | bpf_prog_unlock_free(fp); |
0a14842f | 470 | } |
34805931 | 471 | #endif /* CONFIG_BPF_JIT */ |
0a14842f | 472 | |
ea02f941 MS |
473 | static inline int bpf_tell_extensions(void) |
474 | { | |
37692299 | 475 | return SKF_AD_MAX; |
ea02f941 MS |
476 | } |
477 | ||
1da177e4 | 478 | #endif /* __LINUX_FILTER_H__ */ |