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 | ||
b954d834 DB |
7 | #include <stdarg.h> |
8 | ||
60063497 | 9 | #include <linux/atomic.h> |
0c5fe1b4 | 10 | #include <linux/compat.h> |
9f12fbe6 | 11 | #include <linux/skbuff.h> |
b954d834 DB |
12 | #include <linux/linkage.h> |
13 | #include <linux/printk.h> | |
d45ed4a4 | 14 | #include <linux/workqueue.h> |
b954d834 | 15 | |
60a3b225 | 16 | #include <asm/cacheflush.h> |
b954d834 DB |
17 | |
18 | #include <uapi/linux/filter.h> | |
daedfb22 | 19 | #include <uapi/linux/bpf.h> |
60a3b225 DB |
20 | |
21 | struct sk_buff; | |
22 | struct sock; | |
23 | struct seccomp_data; | |
09756af4 | 24 | struct bpf_prog_aux; |
792d4b5c | 25 | |
30743837 DB |
26 | /* ArgX, context and stack frame pointer register positions. Note, |
27 | * Arg1, Arg2, Arg3, etc are used as argument mappings of function | |
28 | * calls in BPF_CALL instruction. | |
29 | */ | |
30 | #define BPF_REG_ARG1 BPF_REG_1 | |
31 | #define BPF_REG_ARG2 BPF_REG_2 | |
32 | #define BPF_REG_ARG3 BPF_REG_3 | |
33 | #define BPF_REG_ARG4 BPF_REG_4 | |
34 | #define BPF_REG_ARG5 BPF_REG_5 | |
35 | #define BPF_REG_CTX BPF_REG_6 | |
36 | #define BPF_REG_FP BPF_REG_10 | |
37 | ||
38 | /* Additional register mappings for converted user programs. */ | |
39 | #define BPF_REG_A BPF_REG_0 | |
40 | #define BPF_REG_X BPF_REG_7 | |
41 | #define BPF_REG_TMP BPF_REG_8 | |
bd4cf0ed AS |
42 | |
43 | /* BPF program can access up to 512 bytes of stack space. */ | |
44 | #define MAX_BPF_STACK 512 | |
45 | ||
f8f6d679 DB |
46 | /* Helper macros for filter block array initializers. */ |
47 | ||
e430f34e | 48 | /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */ |
f8f6d679 | 49 | |
e430f34e | 50 | #define BPF_ALU64_REG(OP, DST, SRC) \ |
2695fb55 | 51 | ((struct bpf_insn) { \ |
f8f6d679 | 52 | .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \ |
e430f34e AS |
53 | .dst_reg = DST, \ |
54 | .src_reg = SRC, \ | |
f8f6d679 DB |
55 | .off = 0, \ |
56 | .imm = 0 }) | |
57 | ||
e430f34e | 58 | #define BPF_ALU32_REG(OP, DST, SRC) \ |
2695fb55 | 59 | ((struct bpf_insn) { \ |
f8f6d679 | 60 | .code = BPF_ALU | BPF_OP(OP) | BPF_X, \ |
e430f34e AS |
61 | .dst_reg = DST, \ |
62 | .src_reg = SRC, \ | |
f8f6d679 DB |
63 | .off = 0, \ |
64 | .imm = 0 }) | |
65 | ||
e430f34e | 66 | /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */ |
f8f6d679 | 67 | |
e430f34e | 68 | #define BPF_ALU64_IMM(OP, DST, IMM) \ |
2695fb55 | 69 | ((struct bpf_insn) { \ |
f8f6d679 | 70 | .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
71 | .dst_reg = DST, \ |
72 | .src_reg = 0, \ | |
f8f6d679 DB |
73 | .off = 0, \ |
74 | .imm = IMM }) | |
75 | ||
e430f34e | 76 | #define BPF_ALU32_IMM(OP, DST, IMM) \ |
2695fb55 | 77 | ((struct bpf_insn) { \ |
f8f6d679 | 78 | .code = BPF_ALU | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
79 | .dst_reg = DST, \ |
80 | .src_reg = 0, \ | |
f8f6d679 DB |
81 | .off = 0, \ |
82 | .imm = IMM }) | |
83 | ||
84 | /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */ | |
85 | ||
e430f34e | 86 | #define BPF_ENDIAN(TYPE, DST, LEN) \ |
2695fb55 | 87 | ((struct bpf_insn) { \ |
f8f6d679 | 88 | .code = BPF_ALU | BPF_END | BPF_SRC(TYPE), \ |
e430f34e AS |
89 | .dst_reg = DST, \ |
90 | .src_reg = 0, \ | |
f8f6d679 DB |
91 | .off = 0, \ |
92 | .imm = LEN }) | |
93 | ||
e430f34e | 94 | /* Short form of mov, dst_reg = src_reg */ |
f8f6d679 | 95 | |
e430f34e | 96 | #define BPF_MOV64_REG(DST, SRC) \ |
2695fb55 | 97 | ((struct bpf_insn) { \ |
f8f6d679 | 98 | .code = BPF_ALU64 | BPF_MOV | BPF_X, \ |
e430f34e AS |
99 | .dst_reg = DST, \ |
100 | .src_reg = SRC, \ | |
f8f6d679 DB |
101 | .off = 0, \ |
102 | .imm = 0 }) | |
103 | ||
e430f34e | 104 | #define BPF_MOV32_REG(DST, SRC) \ |
2695fb55 | 105 | ((struct bpf_insn) { \ |
f8f6d679 | 106 | .code = BPF_ALU | BPF_MOV | BPF_X, \ |
e430f34e AS |
107 | .dst_reg = DST, \ |
108 | .src_reg = SRC, \ | |
f8f6d679 DB |
109 | .off = 0, \ |
110 | .imm = 0 }) | |
111 | ||
e430f34e | 112 | /* Short form of mov, dst_reg = imm32 */ |
f8f6d679 | 113 | |
e430f34e | 114 | #define BPF_MOV64_IMM(DST, IMM) \ |
2695fb55 | 115 | ((struct bpf_insn) { \ |
f8f6d679 | 116 | .code = BPF_ALU64 | BPF_MOV | BPF_K, \ |
e430f34e AS |
117 | .dst_reg = DST, \ |
118 | .src_reg = 0, \ | |
f8f6d679 DB |
119 | .off = 0, \ |
120 | .imm = IMM }) | |
121 | ||
e430f34e | 122 | #define BPF_MOV32_IMM(DST, IMM) \ |
2695fb55 | 123 | ((struct bpf_insn) { \ |
f8f6d679 | 124 | .code = BPF_ALU | BPF_MOV | BPF_K, \ |
e430f34e AS |
125 | .dst_reg = DST, \ |
126 | .src_reg = 0, \ | |
f8f6d679 DB |
127 | .off = 0, \ |
128 | .imm = IMM }) | |
129 | ||
02ab695b AS |
130 | /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */ |
131 | #define BPF_LD_IMM64(DST, IMM) \ | |
132 | BPF_LD_IMM64_RAW(DST, 0, IMM) | |
133 | ||
134 | #define BPF_LD_IMM64_RAW(DST, SRC, IMM) \ | |
135 | ((struct bpf_insn) { \ | |
136 | .code = BPF_LD | BPF_DW | BPF_IMM, \ | |
137 | .dst_reg = DST, \ | |
138 | .src_reg = SRC, \ | |
139 | .off = 0, \ | |
140 | .imm = (__u32) (IMM) }), \ | |
141 | ((struct bpf_insn) { \ | |
142 | .code = 0, /* zero is reserved opcode */ \ | |
143 | .dst_reg = 0, \ | |
144 | .src_reg = 0, \ | |
145 | .off = 0, \ | |
146 | .imm = ((__u64) (IMM)) >> 32 }) | |
147 | ||
0246e64d AS |
148 | #define BPF_PSEUDO_MAP_FD 1 |
149 | ||
150 | /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */ | |
151 | #define BPF_LD_MAP_FD(DST, MAP_FD) \ | |
152 | BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD) | |
153 | ||
e430f34e | 154 | /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */ |
f8f6d679 | 155 | |
e430f34e | 156 | #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \ |
2695fb55 | 157 | ((struct bpf_insn) { \ |
f8f6d679 | 158 | .code = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE), \ |
e430f34e AS |
159 | .dst_reg = DST, \ |
160 | .src_reg = SRC, \ | |
f8f6d679 DB |
161 | .off = 0, \ |
162 | .imm = IMM }) | |
163 | ||
e430f34e | 164 | #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM) \ |
2695fb55 | 165 | ((struct bpf_insn) { \ |
f8f6d679 | 166 | .code = BPF_ALU | BPF_MOV | BPF_SRC(TYPE), \ |
e430f34e AS |
167 | .dst_reg = DST, \ |
168 | .src_reg = SRC, \ | |
f8f6d679 DB |
169 | .off = 0, \ |
170 | .imm = IMM }) | |
171 | ||
e430f34e | 172 | /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */ |
f8f6d679 | 173 | |
e430f34e | 174 | #define BPF_LD_ABS(SIZE, IMM) \ |
2695fb55 | 175 | ((struct bpf_insn) { \ |
f8f6d679 | 176 | .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \ |
e430f34e AS |
177 | .dst_reg = 0, \ |
178 | .src_reg = 0, \ | |
f8f6d679 | 179 | .off = 0, \ |
e430f34e | 180 | .imm = IMM }) |
f8f6d679 | 181 | |
e430f34e | 182 | /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */ |
f8f6d679 | 183 | |
e430f34e | 184 | #define BPF_LD_IND(SIZE, SRC, IMM) \ |
2695fb55 | 185 | ((struct bpf_insn) { \ |
f8f6d679 | 186 | .code = BPF_LD | BPF_SIZE(SIZE) | BPF_IND, \ |
e430f34e AS |
187 | .dst_reg = 0, \ |
188 | .src_reg = SRC, \ | |
f8f6d679 | 189 | .off = 0, \ |
e430f34e | 190 | .imm = IMM }) |
f8f6d679 | 191 | |
e430f34e | 192 | /* Memory load, dst_reg = *(uint *) (src_reg + off16) */ |
f8f6d679 | 193 | |
e430f34e | 194 | #define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \ |
2695fb55 | 195 | ((struct bpf_insn) { \ |
f8f6d679 | 196 | .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \ |
e430f34e AS |
197 | .dst_reg = DST, \ |
198 | .src_reg = SRC, \ | |
f8f6d679 DB |
199 | .off = OFF, \ |
200 | .imm = 0 }) | |
201 | ||
e430f34e AS |
202 | /* Memory store, *(uint *) (dst_reg + off16) = src_reg */ |
203 | ||
204 | #define BPF_STX_MEM(SIZE, DST, SRC, OFF) \ | |
2695fb55 | 205 | ((struct bpf_insn) { \ |
f8f6d679 | 206 | .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \ |
e430f34e AS |
207 | .dst_reg = DST, \ |
208 | .src_reg = SRC, \ | |
f8f6d679 DB |
209 | .off = OFF, \ |
210 | .imm = 0 }) | |
211 | ||
e430f34e AS |
212 | /* Memory store, *(uint *) (dst_reg + off16) = imm32 */ |
213 | ||
214 | #define BPF_ST_MEM(SIZE, DST, OFF, IMM) \ | |
2695fb55 | 215 | ((struct bpf_insn) { \ |
e430f34e AS |
216 | .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \ |
217 | .dst_reg = DST, \ | |
218 | .src_reg = 0, \ | |
219 | .off = OFF, \ | |
220 | .imm = IMM }) | |
221 | ||
222 | /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */ | |
f8f6d679 | 223 | |
e430f34e | 224 | #define BPF_JMP_REG(OP, DST, SRC, OFF) \ |
2695fb55 | 225 | ((struct bpf_insn) { \ |
f8f6d679 | 226 | .code = BPF_JMP | BPF_OP(OP) | BPF_X, \ |
e430f34e AS |
227 | .dst_reg = DST, \ |
228 | .src_reg = SRC, \ | |
f8f6d679 DB |
229 | .off = OFF, \ |
230 | .imm = 0 }) | |
231 | ||
e430f34e | 232 | /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */ |
f8f6d679 | 233 | |
e430f34e | 234 | #define BPF_JMP_IMM(OP, DST, IMM, OFF) \ |
2695fb55 | 235 | ((struct bpf_insn) { \ |
f8f6d679 | 236 | .code = BPF_JMP | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
237 | .dst_reg = DST, \ |
238 | .src_reg = 0, \ | |
f8f6d679 DB |
239 | .off = OFF, \ |
240 | .imm = IMM }) | |
241 | ||
242 | /* Function call */ | |
243 | ||
244 | #define BPF_EMIT_CALL(FUNC) \ | |
2695fb55 | 245 | ((struct bpf_insn) { \ |
f8f6d679 | 246 | .code = BPF_JMP | BPF_CALL, \ |
e430f34e AS |
247 | .dst_reg = 0, \ |
248 | .src_reg = 0, \ | |
f8f6d679 DB |
249 | .off = 0, \ |
250 | .imm = ((FUNC) - __bpf_call_base) }) | |
251 | ||
252 | /* Raw code statement block */ | |
253 | ||
e430f34e | 254 | #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \ |
2695fb55 | 255 | ((struct bpf_insn) { \ |
f8f6d679 | 256 | .code = CODE, \ |
e430f34e AS |
257 | .dst_reg = DST, \ |
258 | .src_reg = SRC, \ | |
f8f6d679 DB |
259 | .off = OFF, \ |
260 | .imm = IMM }) | |
261 | ||
262 | /* Program exit */ | |
263 | ||
264 | #define BPF_EXIT_INSN() \ | |
2695fb55 | 265 | ((struct bpf_insn) { \ |
f8f6d679 | 266 | .code = BPF_JMP | BPF_EXIT, \ |
e430f34e AS |
267 | .dst_reg = 0, \ |
268 | .src_reg = 0, \ | |
f8f6d679 DB |
269 | .off = 0, \ |
270 | .imm = 0 }) | |
271 | ||
272 | #define bytes_to_bpf_size(bytes) \ | |
273 | ({ \ | |
274 | int bpf_size = -EINVAL; \ | |
275 | \ | |
276 | if (bytes == sizeof(u8)) \ | |
277 | bpf_size = BPF_B; \ | |
278 | else if (bytes == sizeof(u16)) \ | |
279 | bpf_size = BPF_H; \ | |
280 | else if (bytes == sizeof(u32)) \ | |
281 | bpf_size = BPF_W; \ | |
282 | else if (bytes == sizeof(u64)) \ | |
283 | bpf_size = BPF_DW; \ | |
284 | \ | |
285 | bpf_size; \ | |
286 | }) | |
9739eef1 | 287 | |
30743837 | 288 | /* Macro to invoke filter function. */ |
7ae457c1 AS |
289 | #define SK_RUN_FILTER(filter, ctx) \ |
290 | (*filter->prog->bpf_func)(ctx, filter->prog->insnsi) | |
bd4cf0ed | 291 | |
bd4cf0ed AS |
292 | #ifdef CONFIG_COMPAT |
293 | /* A struct sock_filter is architecture independent. */ | |
0c5fe1b4 WD |
294 | struct compat_sock_fprog { |
295 | u16 len; | |
bd4cf0ed | 296 | compat_uptr_t filter; /* struct sock_filter * */ |
0c5fe1b4 WD |
297 | }; |
298 | #endif | |
299 | ||
a3ea269b DB |
300 | struct sock_fprog_kern { |
301 | u16 len; | |
302 | struct sock_filter *filter; | |
303 | }; | |
304 | ||
738cbe72 DB |
305 | struct bpf_binary_header { |
306 | unsigned int pages; | |
307 | u8 image[]; | |
308 | }; | |
309 | ||
7ae457c1 | 310 | struct bpf_prog { |
286aad3c DB |
311 | u16 pages; /* Number of allocated pages */ |
312 | bool jited; /* Is our filter JIT'ed? */ | |
313 | u32 len; /* Number of filter blocks */ | |
a3ea269b | 314 | struct sock_fprog_kern *orig_prog; /* Original BPF program */ |
09756af4 | 315 | struct bpf_prog_aux *aux; /* Auxiliary fields */ |
0a14842f | 316 | unsigned int (*bpf_func)(const struct sk_buff *skb, |
2695fb55 | 317 | const struct bpf_insn *filter); |
60a3b225 | 318 | /* Instructions for interpreter */ |
d45ed4a4 | 319 | union { |
bd4cf0ed | 320 | struct sock_filter insns[0]; |
2695fb55 | 321 | struct bpf_insn insnsi[0]; |
d45ed4a4 | 322 | }; |
b715631f SH |
323 | }; |
324 | ||
7ae457c1 AS |
325 | struct sk_filter { |
326 | atomic_t refcnt; | |
327 | struct rcu_head rcu; | |
328 | struct bpf_prog *prog; | |
329 | }; | |
330 | ||
331 | #define BPF_PROG_RUN(filter, ctx) (*filter->bpf_func)(ctx, filter->insnsi) | |
332 | ||
333 | static inline unsigned int bpf_prog_size(unsigned int proglen) | |
b715631f | 334 | { |
7ae457c1 AS |
335 | return max(sizeof(struct bpf_prog), |
336 | offsetof(struct bpf_prog, insns[proglen])); | |
b715631f SH |
337 | } |
338 | ||
009937e7 | 339 | #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0])) |
a3ea269b | 340 | |
60a3b225 DB |
341 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
342 | static inline void bpf_prog_lock_ro(struct bpf_prog *fp) | |
343 | { | |
344 | set_memory_ro((unsigned long)fp, fp->pages); | |
345 | } | |
346 | ||
347 | static inline void bpf_prog_unlock_ro(struct bpf_prog *fp) | |
348 | { | |
349 | set_memory_rw((unsigned long)fp, fp->pages); | |
350 | } | |
351 | #else | |
352 | static inline void bpf_prog_lock_ro(struct bpf_prog *fp) | |
353 | { | |
354 | } | |
355 | ||
356 | static inline void bpf_prog_unlock_ro(struct bpf_prog *fp) | |
357 | { | |
358 | } | |
359 | #endif /* CONFIG_DEBUG_SET_MODULE_RONX */ | |
360 | ||
fbc907f0 | 361 | int sk_filter(struct sock *sk, struct sk_buff *skb); |
bd4cf0ed | 362 | |
7ae457c1 AS |
363 | void bpf_prog_select_runtime(struct bpf_prog *fp); |
364 | void bpf_prog_free(struct bpf_prog *fp); | |
bd4cf0ed | 365 | |
8fb575ca AS |
366 | int bpf_convert_filter(struct sock_filter *prog, int len, |
367 | struct bpf_insn *new_prog, int *new_len); | |
a3ea269b | 368 | |
60a3b225 DB |
369 | struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags); |
370 | struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size, | |
371 | gfp_t gfp_extra_flags); | |
372 | void __bpf_prog_free(struct bpf_prog *fp); | |
373 | ||
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 | |
b954d834 DB |
396 | #ifdef CONFIG_BPF_JIT |
397 | typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size); | |
398 | ||
399 | struct bpf_binary_header * | |
400 | bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, | |
401 | unsigned int alignment, | |
402 | bpf_jit_fill_hole_t bpf_fill_ill_insns); | |
403 | void bpf_jit_binary_free(struct bpf_binary_header *hdr); | |
404 | ||
405 | void bpf_jit_compile(struct bpf_prog *fp); | |
406 | void bpf_jit_free(struct bpf_prog *fp); | |
407 | ||
408 | static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen, | |
409 | u32 pass, void *image) | |
410 | { | |
411 | pr_err("flen=%u proglen=%u pass=%u image=%pK\n", | |
412 | flen, proglen, pass, image); | |
413 | if (image) | |
414 | print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET, | |
415 | 16, 1, image, proglen, false); | |
416 | } | |
417 | #else | |
418 | static inline void bpf_jit_compile(struct bpf_prog *fp) | |
419 | { | |
420 | } | |
421 | ||
422 | static inline void bpf_jit_free(struct bpf_prog *fp) | |
423 | { | |
424 | bpf_prog_unlock_free(fp); | |
425 | } | |
426 | #endif /* CONFIG_BPF_JIT */ | |
427 | ||
34805931 DB |
428 | #define BPF_ANC BIT(15) |
429 | ||
430 | static inline u16 bpf_anc_helper(const struct sock_filter *ftest) | |
431 | { | |
432 | BUG_ON(ftest->code & BPF_ANC); | |
433 | ||
434 | switch (ftest->code) { | |
435 | case BPF_LD | BPF_W | BPF_ABS: | |
436 | case BPF_LD | BPF_H | BPF_ABS: | |
437 | case BPF_LD | BPF_B | BPF_ABS: | |
438 | #define BPF_ANCILLARY(CODE) case SKF_AD_OFF + SKF_AD_##CODE: \ | |
439 | return BPF_ANC | SKF_AD_##CODE | |
440 | switch (ftest->k) { | |
441 | BPF_ANCILLARY(PROTOCOL); | |
442 | BPF_ANCILLARY(PKTTYPE); | |
443 | BPF_ANCILLARY(IFINDEX); | |
444 | BPF_ANCILLARY(NLATTR); | |
445 | BPF_ANCILLARY(NLATTR_NEST); | |
446 | BPF_ANCILLARY(MARK); | |
447 | BPF_ANCILLARY(QUEUE); | |
448 | BPF_ANCILLARY(HATYPE); | |
449 | BPF_ANCILLARY(RXHASH); | |
450 | BPF_ANCILLARY(CPU); | |
451 | BPF_ANCILLARY(ALU_XOR_X); | |
452 | BPF_ANCILLARY(VLAN_TAG); | |
453 | BPF_ANCILLARY(VLAN_TAG_PRESENT); | |
454 | BPF_ANCILLARY(PAY_OFFSET); | |
455 | BPF_ANCILLARY(RANDOM); | |
456 | } | |
457 | /* Fallthrough. */ | |
458 | default: | |
459 | return ftest->code; | |
460 | } | |
461 | } | |
462 | ||
9f12fbe6 ZSL |
463 | void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb, |
464 | int k, unsigned int size); | |
465 | ||
466 | static inline void *bpf_load_pointer(const struct sk_buff *skb, int k, | |
467 | unsigned int size, void *buffer) | |
468 | { | |
469 | if (k >= 0) | |
470 | return skb_header_pointer(skb, k, size, buffer); | |
471 | ||
472 | return bpf_internal_load_pointer_neg_helper(skb, k, size); | |
473 | } | |
474 | ||
ea02f941 MS |
475 | static inline int bpf_tell_extensions(void) |
476 | { | |
37692299 | 477 | return SKF_AD_MAX; |
ea02f941 MS |
478 | } |
479 | ||
1da177e4 | 480 | #endif /* __LINUX_FILTER_H__ */ |