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> |
b13138ef | 15 | #include <linux/sched.h> |
b954d834 | 16 | |
60a3b225 | 17 | #include <asm/cacheflush.h> |
b954d834 DB |
18 | |
19 | #include <uapi/linux/filter.h> | |
daedfb22 | 20 | #include <uapi/linux/bpf.h> |
60a3b225 DB |
21 | |
22 | struct sk_buff; | |
23 | struct sock; | |
24 | struct seccomp_data; | |
09756af4 | 25 | struct bpf_prog_aux; |
792d4b5c | 26 | |
30743837 DB |
27 | /* ArgX, context and stack frame pointer register positions. Note, |
28 | * Arg1, Arg2, Arg3, etc are used as argument mappings of function | |
29 | * calls in BPF_CALL instruction. | |
30 | */ | |
31 | #define BPF_REG_ARG1 BPF_REG_1 | |
32 | #define BPF_REG_ARG2 BPF_REG_2 | |
33 | #define BPF_REG_ARG3 BPF_REG_3 | |
34 | #define BPF_REG_ARG4 BPF_REG_4 | |
35 | #define BPF_REG_ARG5 BPF_REG_5 | |
36 | #define BPF_REG_CTX BPF_REG_6 | |
37 | #define BPF_REG_FP BPF_REG_10 | |
38 | ||
39 | /* Additional register mappings for converted user programs. */ | |
40 | #define BPF_REG_A BPF_REG_0 | |
41 | #define BPF_REG_X BPF_REG_7 | |
42 | #define BPF_REG_TMP BPF_REG_8 | |
bd4cf0ed AS |
43 | |
44 | /* BPF program can access up to 512 bytes of stack space. */ | |
45 | #define MAX_BPF_STACK 512 | |
46 | ||
f8f6d679 DB |
47 | /* Helper macros for filter block array initializers. */ |
48 | ||
e430f34e | 49 | /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */ |
f8f6d679 | 50 | |
e430f34e | 51 | #define BPF_ALU64_REG(OP, DST, SRC) \ |
2695fb55 | 52 | ((struct bpf_insn) { \ |
f8f6d679 | 53 | .code = BPF_ALU64 | 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 | #define BPF_ALU32_REG(OP, DST, SRC) \ |
2695fb55 | 60 | ((struct bpf_insn) { \ |
f8f6d679 | 61 | .code = BPF_ALU | BPF_OP(OP) | BPF_X, \ |
e430f34e AS |
62 | .dst_reg = DST, \ |
63 | .src_reg = SRC, \ | |
f8f6d679 DB |
64 | .off = 0, \ |
65 | .imm = 0 }) | |
66 | ||
e430f34e | 67 | /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */ |
f8f6d679 | 68 | |
e430f34e | 69 | #define BPF_ALU64_IMM(OP, DST, IMM) \ |
2695fb55 | 70 | ((struct bpf_insn) { \ |
f8f6d679 | 71 | .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
72 | .dst_reg = DST, \ |
73 | .src_reg = 0, \ | |
f8f6d679 DB |
74 | .off = 0, \ |
75 | .imm = IMM }) | |
76 | ||
e430f34e | 77 | #define BPF_ALU32_IMM(OP, DST, IMM) \ |
2695fb55 | 78 | ((struct bpf_insn) { \ |
f8f6d679 | 79 | .code = BPF_ALU | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
80 | .dst_reg = DST, \ |
81 | .src_reg = 0, \ | |
f8f6d679 DB |
82 | .off = 0, \ |
83 | .imm = IMM }) | |
84 | ||
85 | /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */ | |
86 | ||
e430f34e | 87 | #define BPF_ENDIAN(TYPE, DST, LEN) \ |
2695fb55 | 88 | ((struct bpf_insn) { \ |
f8f6d679 | 89 | .code = BPF_ALU | BPF_END | BPF_SRC(TYPE), \ |
e430f34e AS |
90 | .dst_reg = DST, \ |
91 | .src_reg = 0, \ | |
f8f6d679 DB |
92 | .off = 0, \ |
93 | .imm = LEN }) | |
94 | ||
e430f34e | 95 | /* Short form of mov, dst_reg = src_reg */ |
f8f6d679 | 96 | |
e430f34e | 97 | #define BPF_MOV64_REG(DST, SRC) \ |
2695fb55 | 98 | ((struct bpf_insn) { \ |
f8f6d679 | 99 | .code = BPF_ALU64 | 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 | #define BPF_MOV32_REG(DST, SRC) \ |
2695fb55 | 106 | ((struct bpf_insn) { \ |
f8f6d679 | 107 | .code = BPF_ALU | BPF_MOV | BPF_X, \ |
e430f34e AS |
108 | .dst_reg = DST, \ |
109 | .src_reg = SRC, \ | |
f8f6d679 DB |
110 | .off = 0, \ |
111 | .imm = 0 }) | |
112 | ||
e430f34e | 113 | /* Short form of mov, dst_reg = imm32 */ |
f8f6d679 | 114 | |
e430f34e | 115 | #define BPF_MOV64_IMM(DST, IMM) \ |
2695fb55 | 116 | ((struct bpf_insn) { \ |
f8f6d679 | 117 | .code = BPF_ALU64 | BPF_MOV | BPF_K, \ |
e430f34e AS |
118 | .dst_reg = DST, \ |
119 | .src_reg = 0, \ | |
f8f6d679 DB |
120 | .off = 0, \ |
121 | .imm = IMM }) | |
122 | ||
e430f34e | 123 | #define BPF_MOV32_IMM(DST, IMM) \ |
2695fb55 | 124 | ((struct bpf_insn) { \ |
f8f6d679 | 125 | .code = BPF_ALU | BPF_MOV | BPF_K, \ |
e430f34e AS |
126 | .dst_reg = DST, \ |
127 | .src_reg = 0, \ | |
f8f6d679 DB |
128 | .off = 0, \ |
129 | .imm = IMM }) | |
130 | ||
02ab695b AS |
131 | /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */ |
132 | #define BPF_LD_IMM64(DST, IMM) \ | |
133 | BPF_LD_IMM64_RAW(DST, 0, IMM) | |
134 | ||
135 | #define BPF_LD_IMM64_RAW(DST, SRC, IMM) \ | |
136 | ((struct bpf_insn) { \ | |
137 | .code = BPF_LD | BPF_DW | BPF_IMM, \ | |
138 | .dst_reg = DST, \ | |
139 | .src_reg = SRC, \ | |
140 | .off = 0, \ | |
141 | .imm = (__u32) (IMM) }), \ | |
142 | ((struct bpf_insn) { \ | |
143 | .code = 0, /* zero is reserved opcode */ \ | |
144 | .dst_reg = 0, \ | |
145 | .src_reg = 0, \ | |
146 | .off = 0, \ | |
147 | .imm = ((__u64) (IMM)) >> 32 }) | |
148 | ||
0246e64d AS |
149 | /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */ |
150 | #define BPF_LD_MAP_FD(DST, MAP_FD) \ | |
151 | BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD) | |
152 | ||
e430f34e | 153 | /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */ |
f8f6d679 | 154 | |
e430f34e | 155 | #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \ |
2695fb55 | 156 | ((struct bpf_insn) { \ |
f8f6d679 | 157 | .code = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE), \ |
e430f34e AS |
158 | .dst_reg = DST, \ |
159 | .src_reg = SRC, \ | |
f8f6d679 DB |
160 | .off = 0, \ |
161 | .imm = IMM }) | |
162 | ||
e430f34e | 163 | #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM) \ |
2695fb55 | 164 | ((struct bpf_insn) { \ |
f8f6d679 | 165 | .code = BPF_ALU | BPF_MOV | BPF_SRC(TYPE), \ |
e430f34e AS |
166 | .dst_reg = DST, \ |
167 | .src_reg = SRC, \ | |
f8f6d679 DB |
168 | .off = 0, \ |
169 | .imm = IMM }) | |
170 | ||
e430f34e | 171 | /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */ |
f8f6d679 | 172 | |
e430f34e | 173 | #define BPF_LD_ABS(SIZE, IMM) \ |
2695fb55 | 174 | ((struct bpf_insn) { \ |
f8f6d679 | 175 | .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \ |
e430f34e AS |
176 | .dst_reg = 0, \ |
177 | .src_reg = 0, \ | |
f8f6d679 | 178 | .off = 0, \ |
e430f34e | 179 | .imm = IMM }) |
f8f6d679 | 180 | |
e430f34e | 181 | /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */ |
f8f6d679 | 182 | |
e430f34e | 183 | #define BPF_LD_IND(SIZE, SRC, IMM) \ |
2695fb55 | 184 | ((struct bpf_insn) { \ |
f8f6d679 | 185 | .code = BPF_LD | BPF_SIZE(SIZE) | BPF_IND, \ |
e430f34e AS |
186 | .dst_reg = 0, \ |
187 | .src_reg = SRC, \ | |
f8f6d679 | 188 | .off = 0, \ |
e430f34e | 189 | .imm = IMM }) |
f8f6d679 | 190 | |
e430f34e | 191 | /* Memory load, dst_reg = *(uint *) (src_reg + off16) */ |
f8f6d679 | 192 | |
e430f34e | 193 | #define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \ |
2695fb55 | 194 | ((struct bpf_insn) { \ |
f8f6d679 | 195 | .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \ |
e430f34e AS |
196 | .dst_reg = DST, \ |
197 | .src_reg = SRC, \ | |
f8f6d679 DB |
198 | .off = OFF, \ |
199 | .imm = 0 }) | |
200 | ||
e430f34e AS |
201 | /* Memory store, *(uint *) (dst_reg + off16) = src_reg */ |
202 | ||
203 | #define BPF_STX_MEM(SIZE, DST, SRC, OFF) \ | |
2695fb55 | 204 | ((struct bpf_insn) { \ |
f8f6d679 | 205 | .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \ |
e430f34e AS |
206 | .dst_reg = DST, \ |
207 | .src_reg = SRC, \ | |
f8f6d679 DB |
208 | .off = OFF, \ |
209 | .imm = 0 }) | |
210 | ||
cffc642d MH |
211 | /* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */ |
212 | ||
213 | #define BPF_STX_XADD(SIZE, DST, SRC, OFF) \ | |
214 | ((struct bpf_insn) { \ | |
215 | .code = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD, \ | |
216 | .dst_reg = DST, \ | |
217 | .src_reg = SRC, \ | |
218 | .off = OFF, \ | |
219 | .imm = 0 }) | |
220 | ||
e430f34e AS |
221 | /* Memory store, *(uint *) (dst_reg + off16) = imm32 */ |
222 | ||
223 | #define BPF_ST_MEM(SIZE, DST, OFF, IMM) \ | |
2695fb55 | 224 | ((struct bpf_insn) { \ |
e430f34e AS |
225 | .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \ |
226 | .dst_reg = DST, \ | |
227 | .src_reg = 0, \ | |
228 | .off = OFF, \ | |
229 | .imm = IMM }) | |
230 | ||
231 | /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */ | |
f8f6d679 | 232 | |
e430f34e | 233 | #define BPF_JMP_REG(OP, DST, SRC, OFF) \ |
2695fb55 | 234 | ((struct bpf_insn) { \ |
f8f6d679 | 235 | .code = BPF_JMP | BPF_OP(OP) | BPF_X, \ |
e430f34e AS |
236 | .dst_reg = DST, \ |
237 | .src_reg = SRC, \ | |
f8f6d679 DB |
238 | .off = OFF, \ |
239 | .imm = 0 }) | |
240 | ||
e430f34e | 241 | /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */ |
f8f6d679 | 242 | |
e430f34e | 243 | #define BPF_JMP_IMM(OP, DST, IMM, OFF) \ |
2695fb55 | 244 | ((struct bpf_insn) { \ |
f8f6d679 | 245 | .code = BPF_JMP | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
246 | .dst_reg = DST, \ |
247 | .src_reg = 0, \ | |
f8f6d679 DB |
248 | .off = OFF, \ |
249 | .imm = IMM }) | |
250 | ||
251 | /* Function call */ | |
252 | ||
253 | #define BPF_EMIT_CALL(FUNC) \ | |
2695fb55 | 254 | ((struct bpf_insn) { \ |
f8f6d679 | 255 | .code = BPF_JMP | BPF_CALL, \ |
e430f34e AS |
256 | .dst_reg = 0, \ |
257 | .src_reg = 0, \ | |
f8f6d679 DB |
258 | .off = 0, \ |
259 | .imm = ((FUNC) - __bpf_call_base) }) | |
260 | ||
261 | /* Raw code statement block */ | |
262 | ||
e430f34e | 263 | #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \ |
2695fb55 | 264 | ((struct bpf_insn) { \ |
f8f6d679 | 265 | .code = CODE, \ |
e430f34e AS |
266 | .dst_reg = DST, \ |
267 | .src_reg = SRC, \ | |
f8f6d679 DB |
268 | .off = OFF, \ |
269 | .imm = IMM }) | |
270 | ||
271 | /* Program exit */ | |
272 | ||
273 | #define BPF_EXIT_INSN() \ | |
2695fb55 | 274 | ((struct bpf_insn) { \ |
f8f6d679 | 275 | .code = BPF_JMP | BPF_EXIT, \ |
e430f34e AS |
276 | .dst_reg = 0, \ |
277 | .src_reg = 0, \ | |
f8f6d679 DB |
278 | .off = 0, \ |
279 | .imm = 0 }) | |
280 | ||
a4afd37b DB |
281 | /* Internal classic blocks for direct assignment */ |
282 | ||
283 | #define __BPF_STMT(CODE, K) \ | |
284 | ((struct sock_filter) BPF_STMT(CODE, K)) | |
285 | ||
286 | #define __BPF_JUMP(CODE, K, JT, JF) \ | |
287 | ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF)) | |
288 | ||
f8f6d679 DB |
289 | #define bytes_to_bpf_size(bytes) \ |
290 | ({ \ | |
291 | int bpf_size = -EINVAL; \ | |
292 | \ | |
293 | if (bytes == sizeof(u8)) \ | |
294 | bpf_size = BPF_B; \ | |
295 | else if (bytes == sizeof(u16)) \ | |
296 | bpf_size = BPF_H; \ | |
297 | else if (bytes == sizeof(u32)) \ | |
298 | bpf_size = BPF_W; \ | |
299 | else if (bytes == sizeof(u64)) \ | |
300 | bpf_size = BPF_DW; \ | |
301 | \ | |
302 | bpf_size; \ | |
303 | }) | |
9739eef1 | 304 | |
30743837 | 305 | /* Macro to invoke filter function. */ |
7ae457c1 AS |
306 | #define SK_RUN_FILTER(filter, ctx) \ |
307 | (*filter->prog->bpf_func)(ctx, filter->prog->insnsi) | |
bd4cf0ed | 308 | |
bd4cf0ed AS |
309 | #ifdef CONFIG_COMPAT |
310 | /* A struct sock_filter is architecture independent. */ | |
0c5fe1b4 WD |
311 | struct compat_sock_fprog { |
312 | u16 len; | |
bd4cf0ed | 313 | compat_uptr_t filter; /* struct sock_filter * */ |
0c5fe1b4 WD |
314 | }; |
315 | #endif | |
316 | ||
a3ea269b DB |
317 | struct sock_fprog_kern { |
318 | u16 len; | |
319 | struct sock_filter *filter; | |
320 | }; | |
321 | ||
738cbe72 DB |
322 | struct bpf_binary_header { |
323 | unsigned int pages; | |
324 | u8 image[]; | |
325 | }; | |
326 | ||
7ae457c1 | 327 | struct bpf_prog { |
286aad3c DB |
328 | u16 pages; /* Number of allocated pages */ |
329 | bool jited; /* Is our filter JIT'ed? */ | |
24701ece | 330 | bool gpl_compatible; /* Is our filter GPL compatible? */ |
286aad3c | 331 | u32 len; /* Number of filter blocks */ |
24701ece | 332 | enum bpf_prog_type type; /* Type of BPF program */ |
09756af4 | 333 | struct bpf_prog_aux *aux; /* Auxiliary fields */ |
24701ece | 334 | struct sock_fprog_kern *orig_prog; /* Original BPF program */ |
0a14842f | 335 | unsigned int (*bpf_func)(const struct sk_buff *skb, |
2695fb55 | 336 | const struct bpf_insn *filter); |
60a3b225 | 337 | /* Instructions for interpreter */ |
d45ed4a4 | 338 | union { |
bd4cf0ed | 339 | struct sock_filter insns[0]; |
2695fb55 | 340 | struct bpf_insn insnsi[0]; |
d45ed4a4 | 341 | }; |
b715631f SH |
342 | }; |
343 | ||
7ae457c1 AS |
344 | struct sk_filter { |
345 | atomic_t refcnt; | |
346 | struct rcu_head rcu; | |
347 | struct bpf_prog *prog; | |
348 | }; | |
349 | ||
350 | #define BPF_PROG_RUN(filter, ctx) (*filter->bpf_func)(ctx, filter->insnsi) | |
351 | ||
352 | static inline unsigned int bpf_prog_size(unsigned int proglen) | |
b715631f | 353 | { |
7ae457c1 AS |
354 | return max(sizeof(struct bpf_prog), |
355 | offsetof(struct bpf_prog, insns[proglen])); | |
b715631f SH |
356 | } |
357 | ||
7b36f929 DB |
358 | static inline bool bpf_prog_was_classic(const struct bpf_prog *prog) |
359 | { | |
360 | /* When classic BPF programs have been loaded and the arch | |
361 | * does not have a classic BPF JIT (anymore), they have been | |
362 | * converted via bpf_migrate_filter() to eBPF and thus always | |
363 | * have an unspec program type. | |
364 | */ | |
365 | return prog->type == BPF_PROG_TYPE_UNSPEC; | |
366 | } | |
367 | ||
009937e7 | 368 | #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0])) |
a3ea269b | 369 | |
60a3b225 DB |
370 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
371 | static inline void bpf_prog_lock_ro(struct bpf_prog *fp) | |
372 | { | |
373 | set_memory_ro((unsigned long)fp, fp->pages); | |
374 | } | |
375 | ||
376 | static inline void bpf_prog_unlock_ro(struct bpf_prog *fp) | |
377 | { | |
378 | set_memory_rw((unsigned long)fp, fp->pages); | |
379 | } | |
380 | #else | |
381 | static inline void bpf_prog_lock_ro(struct bpf_prog *fp) | |
382 | { | |
383 | } | |
384 | ||
385 | static inline void bpf_prog_unlock_ro(struct bpf_prog *fp) | |
386 | { | |
387 | } | |
388 | #endif /* CONFIG_DEBUG_SET_MODULE_RONX */ | |
389 | ||
fbc907f0 | 390 | int sk_filter(struct sock *sk, struct sk_buff *skb); |
bd4cf0ed | 391 | |
04fd61ab | 392 | int bpf_prog_select_runtime(struct bpf_prog *fp); |
7ae457c1 | 393 | void bpf_prog_free(struct bpf_prog *fp); |
bd4cf0ed | 394 | |
60a3b225 DB |
395 | struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags); |
396 | struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size, | |
397 | gfp_t gfp_extra_flags); | |
398 | void __bpf_prog_free(struct bpf_prog *fp); | |
399 | ||
400 | static inline void bpf_prog_unlock_free(struct bpf_prog *fp) | |
401 | { | |
402 | bpf_prog_unlock_ro(fp); | |
403 | __bpf_prog_free(fp); | |
404 | } | |
405 | ||
ac67eb2c DB |
406 | typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter, |
407 | unsigned int flen); | |
408 | ||
7ae457c1 | 409 | int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog); |
ac67eb2c DB |
410 | int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, |
411 | bpf_aux_classic_check_t trans); | |
7ae457c1 | 412 | void bpf_prog_destroy(struct bpf_prog *fp); |
a3ea269b | 413 | |
fbc907f0 | 414 | int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk); |
89aa0758 | 415 | int sk_attach_bpf(u32 ufd, struct sock *sk); |
fbc907f0 | 416 | int sk_detach_filter(struct sock *sk); |
fbc907f0 DB |
417 | int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, |
418 | unsigned int len); | |
fbc907f0 | 419 | |
278571ba | 420 | bool sk_filter_charge(struct sock *sk, struct sk_filter *fp); |
fbc907f0 | 421 | void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp); |
0a14842f | 422 | |
62258278 | 423 | u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); |
7ae457c1 | 424 | void bpf_int_jit_compile(struct bpf_prog *fp); |
4e10df9a | 425 | bool bpf_helper_changes_skb_data(void *func); |
62258278 | 426 | |
b954d834 DB |
427 | #ifdef CONFIG_BPF_JIT |
428 | typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size); | |
429 | ||
430 | struct bpf_binary_header * | |
431 | bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, | |
432 | unsigned int alignment, | |
433 | bpf_jit_fill_hole_t bpf_fill_ill_insns); | |
434 | void bpf_jit_binary_free(struct bpf_binary_header *hdr); | |
435 | ||
436 | void bpf_jit_compile(struct bpf_prog *fp); | |
437 | void bpf_jit_free(struct bpf_prog *fp); | |
438 | ||
439 | static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen, | |
440 | u32 pass, void *image) | |
441 | { | |
b13138ef DB |
442 | pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen, |
443 | proglen, pass, image, current->comm, task_pid_nr(current)); | |
444 | ||
b954d834 DB |
445 | if (image) |
446 | print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET, | |
447 | 16, 1, image, proglen, false); | |
448 | } | |
449 | #else | |
450 | static inline void bpf_jit_compile(struct bpf_prog *fp) | |
451 | { | |
452 | } | |
453 | ||
454 | static inline void bpf_jit_free(struct bpf_prog *fp) | |
455 | { | |
456 | bpf_prog_unlock_free(fp); | |
457 | } | |
458 | #endif /* CONFIG_BPF_JIT */ | |
459 | ||
34805931 DB |
460 | #define BPF_ANC BIT(15) |
461 | ||
462 | static inline u16 bpf_anc_helper(const struct sock_filter *ftest) | |
463 | { | |
464 | BUG_ON(ftest->code & BPF_ANC); | |
465 | ||
466 | switch (ftest->code) { | |
467 | case BPF_LD | BPF_W | BPF_ABS: | |
468 | case BPF_LD | BPF_H | BPF_ABS: | |
469 | case BPF_LD | BPF_B | BPF_ABS: | |
470 | #define BPF_ANCILLARY(CODE) case SKF_AD_OFF + SKF_AD_##CODE: \ | |
471 | return BPF_ANC | SKF_AD_##CODE | |
472 | switch (ftest->k) { | |
473 | BPF_ANCILLARY(PROTOCOL); | |
474 | BPF_ANCILLARY(PKTTYPE); | |
475 | BPF_ANCILLARY(IFINDEX); | |
476 | BPF_ANCILLARY(NLATTR); | |
477 | BPF_ANCILLARY(NLATTR_NEST); | |
478 | BPF_ANCILLARY(MARK); | |
479 | BPF_ANCILLARY(QUEUE); | |
480 | BPF_ANCILLARY(HATYPE); | |
481 | BPF_ANCILLARY(RXHASH); | |
482 | BPF_ANCILLARY(CPU); | |
483 | BPF_ANCILLARY(ALU_XOR_X); | |
484 | BPF_ANCILLARY(VLAN_TAG); | |
485 | BPF_ANCILLARY(VLAN_TAG_PRESENT); | |
486 | BPF_ANCILLARY(PAY_OFFSET); | |
487 | BPF_ANCILLARY(RANDOM); | |
27cd5452 | 488 | BPF_ANCILLARY(VLAN_TPID); |
34805931 DB |
489 | } |
490 | /* Fallthrough. */ | |
491 | default: | |
492 | return ftest->code; | |
493 | } | |
494 | } | |
495 | ||
9f12fbe6 ZSL |
496 | void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb, |
497 | int k, unsigned int size); | |
498 | ||
499 | static inline void *bpf_load_pointer(const struct sk_buff *skb, int k, | |
500 | unsigned int size, void *buffer) | |
501 | { | |
502 | if (k >= 0) | |
503 | return skb_header_pointer(skb, k, size, buffer); | |
504 | ||
505 | return bpf_internal_load_pointer_neg_helper(skb, k, size); | |
506 | } | |
507 | ||
ea02f941 MS |
508 | static inline int bpf_tell_extensions(void) |
509 | { | |
37692299 | 510 | return SKF_AD_MAX; |
ea02f941 MS |
511 | } |
512 | ||
1da177e4 | 513 | #endif /* __LINUX_FILTER_H__ */ |