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> |
ff936a04 | 16 | #include <net/sch_generic.h> |
b954d834 | 17 | |
60a3b225 | 18 | #include <asm/cacheflush.h> |
b954d834 DB |
19 | |
20 | #include <uapi/linux/filter.h> | |
daedfb22 | 21 | #include <uapi/linux/bpf.h> |
60a3b225 DB |
22 | |
23 | struct sk_buff; | |
24 | struct sock; | |
25 | struct seccomp_data; | |
09756af4 | 26 | struct bpf_prog_aux; |
792d4b5c | 27 | |
30743837 DB |
28 | /* ArgX, context and stack frame pointer register positions. Note, |
29 | * Arg1, Arg2, Arg3, etc are used as argument mappings of function | |
30 | * calls in BPF_CALL instruction. | |
31 | */ | |
32 | #define BPF_REG_ARG1 BPF_REG_1 | |
33 | #define BPF_REG_ARG2 BPF_REG_2 | |
34 | #define BPF_REG_ARG3 BPF_REG_3 | |
35 | #define BPF_REG_ARG4 BPF_REG_4 | |
36 | #define BPF_REG_ARG5 BPF_REG_5 | |
37 | #define BPF_REG_CTX BPF_REG_6 | |
38 | #define BPF_REG_FP BPF_REG_10 | |
39 | ||
40 | /* Additional register mappings for converted user programs. */ | |
41 | #define BPF_REG_A BPF_REG_0 | |
42 | #define BPF_REG_X BPF_REG_7 | |
43 | #define BPF_REG_TMP BPF_REG_8 | |
bd4cf0ed AS |
44 | |
45 | /* BPF program can access up to 512 bytes of stack space. */ | |
46 | #define MAX_BPF_STACK 512 | |
47 | ||
f8f6d679 DB |
48 | /* Helper macros for filter block array initializers. */ |
49 | ||
e430f34e | 50 | /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */ |
f8f6d679 | 51 | |
e430f34e | 52 | #define BPF_ALU64_REG(OP, DST, SRC) \ |
2695fb55 | 53 | ((struct bpf_insn) { \ |
f8f6d679 | 54 | .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \ |
e430f34e AS |
55 | .dst_reg = DST, \ |
56 | .src_reg = SRC, \ | |
f8f6d679 DB |
57 | .off = 0, \ |
58 | .imm = 0 }) | |
59 | ||
e430f34e | 60 | #define BPF_ALU32_REG(OP, DST, SRC) \ |
2695fb55 | 61 | ((struct bpf_insn) { \ |
f8f6d679 | 62 | .code = BPF_ALU | BPF_OP(OP) | BPF_X, \ |
e430f34e AS |
63 | .dst_reg = DST, \ |
64 | .src_reg = SRC, \ | |
f8f6d679 DB |
65 | .off = 0, \ |
66 | .imm = 0 }) | |
67 | ||
e430f34e | 68 | /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */ |
f8f6d679 | 69 | |
e430f34e | 70 | #define BPF_ALU64_IMM(OP, DST, IMM) \ |
2695fb55 | 71 | ((struct bpf_insn) { \ |
f8f6d679 | 72 | .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
73 | .dst_reg = DST, \ |
74 | .src_reg = 0, \ | |
f8f6d679 DB |
75 | .off = 0, \ |
76 | .imm = IMM }) | |
77 | ||
e430f34e | 78 | #define BPF_ALU32_IMM(OP, DST, IMM) \ |
2695fb55 | 79 | ((struct bpf_insn) { \ |
f8f6d679 | 80 | .code = BPF_ALU | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
81 | .dst_reg = DST, \ |
82 | .src_reg = 0, \ | |
f8f6d679 DB |
83 | .off = 0, \ |
84 | .imm = IMM }) | |
85 | ||
86 | /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */ | |
87 | ||
e430f34e | 88 | #define BPF_ENDIAN(TYPE, DST, LEN) \ |
2695fb55 | 89 | ((struct bpf_insn) { \ |
f8f6d679 | 90 | .code = BPF_ALU | BPF_END | BPF_SRC(TYPE), \ |
e430f34e AS |
91 | .dst_reg = DST, \ |
92 | .src_reg = 0, \ | |
f8f6d679 DB |
93 | .off = 0, \ |
94 | .imm = LEN }) | |
95 | ||
e430f34e | 96 | /* Short form of mov, dst_reg = src_reg */ |
f8f6d679 | 97 | |
e430f34e | 98 | #define BPF_MOV64_REG(DST, SRC) \ |
2695fb55 | 99 | ((struct bpf_insn) { \ |
f8f6d679 | 100 | .code = BPF_ALU64 | BPF_MOV | BPF_X, \ |
e430f34e AS |
101 | .dst_reg = DST, \ |
102 | .src_reg = SRC, \ | |
f8f6d679 DB |
103 | .off = 0, \ |
104 | .imm = 0 }) | |
105 | ||
e430f34e | 106 | #define BPF_MOV32_REG(DST, SRC) \ |
2695fb55 | 107 | ((struct bpf_insn) { \ |
f8f6d679 | 108 | .code = BPF_ALU | BPF_MOV | BPF_X, \ |
e430f34e AS |
109 | .dst_reg = DST, \ |
110 | .src_reg = SRC, \ | |
f8f6d679 DB |
111 | .off = 0, \ |
112 | .imm = 0 }) | |
113 | ||
e430f34e | 114 | /* Short form of mov, dst_reg = imm32 */ |
f8f6d679 | 115 | |
e430f34e | 116 | #define BPF_MOV64_IMM(DST, IMM) \ |
2695fb55 | 117 | ((struct bpf_insn) { \ |
f8f6d679 | 118 | .code = BPF_ALU64 | BPF_MOV | BPF_K, \ |
e430f34e AS |
119 | .dst_reg = DST, \ |
120 | .src_reg = 0, \ | |
f8f6d679 DB |
121 | .off = 0, \ |
122 | .imm = IMM }) | |
123 | ||
e430f34e | 124 | #define BPF_MOV32_IMM(DST, IMM) \ |
2695fb55 | 125 | ((struct bpf_insn) { \ |
f8f6d679 | 126 | .code = BPF_ALU | BPF_MOV | BPF_K, \ |
e430f34e AS |
127 | .dst_reg = DST, \ |
128 | .src_reg = 0, \ | |
f8f6d679 DB |
129 | .off = 0, \ |
130 | .imm = IMM }) | |
131 | ||
02ab695b AS |
132 | /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */ |
133 | #define BPF_LD_IMM64(DST, IMM) \ | |
134 | BPF_LD_IMM64_RAW(DST, 0, IMM) | |
135 | ||
136 | #define BPF_LD_IMM64_RAW(DST, SRC, IMM) \ | |
137 | ((struct bpf_insn) { \ | |
138 | .code = BPF_LD | BPF_DW | BPF_IMM, \ | |
139 | .dst_reg = DST, \ | |
140 | .src_reg = SRC, \ | |
141 | .off = 0, \ | |
142 | .imm = (__u32) (IMM) }), \ | |
143 | ((struct bpf_insn) { \ | |
144 | .code = 0, /* zero is reserved opcode */ \ | |
145 | .dst_reg = 0, \ | |
146 | .src_reg = 0, \ | |
147 | .off = 0, \ | |
148 | .imm = ((__u64) (IMM)) >> 32 }) | |
149 | ||
0246e64d AS |
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 | ||
cffc642d MH |
212 | /* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */ |
213 | ||
214 | #define BPF_STX_XADD(SIZE, DST, SRC, OFF) \ | |
215 | ((struct bpf_insn) { \ | |
216 | .code = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD, \ | |
217 | .dst_reg = DST, \ | |
218 | .src_reg = SRC, \ | |
219 | .off = OFF, \ | |
220 | .imm = 0 }) | |
221 | ||
e430f34e AS |
222 | /* Memory store, *(uint *) (dst_reg + off16) = imm32 */ |
223 | ||
224 | #define BPF_ST_MEM(SIZE, DST, OFF, IMM) \ | |
2695fb55 | 225 | ((struct bpf_insn) { \ |
e430f34e AS |
226 | .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \ |
227 | .dst_reg = DST, \ | |
228 | .src_reg = 0, \ | |
229 | .off = OFF, \ | |
230 | .imm = IMM }) | |
231 | ||
232 | /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */ | |
f8f6d679 | 233 | |
e430f34e | 234 | #define BPF_JMP_REG(OP, DST, SRC, OFF) \ |
2695fb55 | 235 | ((struct bpf_insn) { \ |
f8f6d679 | 236 | .code = BPF_JMP | BPF_OP(OP) | BPF_X, \ |
e430f34e AS |
237 | .dst_reg = DST, \ |
238 | .src_reg = SRC, \ | |
f8f6d679 DB |
239 | .off = OFF, \ |
240 | .imm = 0 }) | |
241 | ||
e430f34e | 242 | /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */ |
f8f6d679 | 243 | |
e430f34e | 244 | #define BPF_JMP_IMM(OP, DST, IMM, OFF) \ |
2695fb55 | 245 | ((struct bpf_insn) { \ |
f8f6d679 | 246 | .code = BPF_JMP | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
247 | .dst_reg = DST, \ |
248 | .src_reg = 0, \ | |
f8f6d679 DB |
249 | .off = OFF, \ |
250 | .imm = IMM }) | |
251 | ||
252 | /* Function call */ | |
253 | ||
254 | #define BPF_EMIT_CALL(FUNC) \ | |
2695fb55 | 255 | ((struct bpf_insn) { \ |
f8f6d679 | 256 | .code = BPF_JMP | BPF_CALL, \ |
e430f34e AS |
257 | .dst_reg = 0, \ |
258 | .src_reg = 0, \ | |
f8f6d679 DB |
259 | .off = 0, \ |
260 | .imm = ((FUNC) - __bpf_call_base) }) | |
261 | ||
262 | /* Raw code statement block */ | |
263 | ||
e430f34e | 264 | #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \ |
2695fb55 | 265 | ((struct bpf_insn) { \ |
f8f6d679 | 266 | .code = CODE, \ |
e430f34e AS |
267 | .dst_reg = DST, \ |
268 | .src_reg = SRC, \ | |
f8f6d679 DB |
269 | .off = OFF, \ |
270 | .imm = IMM }) | |
271 | ||
272 | /* Program exit */ | |
273 | ||
274 | #define BPF_EXIT_INSN() \ | |
2695fb55 | 275 | ((struct bpf_insn) { \ |
f8f6d679 | 276 | .code = BPF_JMP | BPF_EXIT, \ |
e430f34e AS |
277 | .dst_reg = 0, \ |
278 | .src_reg = 0, \ | |
f8f6d679 DB |
279 | .off = 0, \ |
280 | .imm = 0 }) | |
281 | ||
a4afd37b DB |
282 | /* Internal classic blocks for direct assignment */ |
283 | ||
284 | #define __BPF_STMT(CODE, K) \ | |
285 | ((struct sock_filter) BPF_STMT(CODE, K)) | |
286 | ||
287 | #define __BPF_JUMP(CODE, K, JT, JF) \ | |
288 | ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF)) | |
289 | ||
f8f6d679 DB |
290 | #define bytes_to_bpf_size(bytes) \ |
291 | ({ \ | |
292 | int bpf_size = -EINVAL; \ | |
293 | \ | |
294 | if (bytes == sizeof(u8)) \ | |
295 | bpf_size = BPF_B; \ | |
296 | else if (bytes == sizeof(u16)) \ | |
297 | bpf_size = BPF_H; \ | |
298 | else if (bytes == sizeof(u32)) \ | |
299 | bpf_size = BPF_W; \ | |
300 | else if (bytes == sizeof(u64)) \ | |
301 | bpf_size = BPF_DW; \ | |
302 | \ | |
303 | bpf_size; \ | |
304 | }) | |
9739eef1 | 305 | |
bd4cf0ed AS |
306 | #ifdef CONFIG_COMPAT |
307 | /* A struct sock_filter is architecture independent. */ | |
0c5fe1b4 WD |
308 | struct compat_sock_fprog { |
309 | u16 len; | |
bd4cf0ed | 310 | compat_uptr_t filter; /* struct sock_filter * */ |
0c5fe1b4 WD |
311 | }; |
312 | #endif | |
313 | ||
a3ea269b DB |
314 | struct sock_fprog_kern { |
315 | u16 len; | |
316 | struct sock_filter *filter; | |
317 | }; | |
318 | ||
738cbe72 DB |
319 | struct bpf_binary_header { |
320 | unsigned int pages; | |
321 | u8 image[]; | |
322 | }; | |
323 | ||
7ae457c1 | 324 | struct bpf_prog { |
286aad3c | 325 | u16 pages; /* Number of allocated pages */ |
a91263d5 DB |
326 | kmemcheck_bitfield_begin(meta); |
327 | u16 jited:1, /* Is our filter JIT'ed? */ | |
c46646d0 | 328 | gpl_compatible:1, /* Is filter GPL compatible? */ |
ff936a04 | 329 | cb_access:1, /* Is control block accessed? */ |
c46646d0 | 330 | dst_needed:1; /* Do we need dst entry? */ |
a91263d5 | 331 | kmemcheck_bitfield_end(meta); |
286aad3c | 332 | u32 len; /* Number of filter blocks */ |
24701ece | 333 | enum bpf_prog_type type; /* Type of BPF program */ |
09756af4 | 334 | struct bpf_prog_aux *aux; /* Auxiliary fields */ |
24701ece | 335 | struct sock_fprog_kern *orig_prog; /* Original BPF program */ |
0a14842f | 336 | unsigned int (*bpf_func)(const struct sk_buff *skb, |
2695fb55 | 337 | const struct bpf_insn *filter); |
60a3b225 | 338 | /* Instructions for interpreter */ |
d45ed4a4 | 339 | union { |
bd4cf0ed | 340 | struct sock_filter insns[0]; |
2695fb55 | 341 | struct bpf_insn insnsi[0]; |
d45ed4a4 | 342 | }; |
b715631f SH |
343 | }; |
344 | ||
7ae457c1 AS |
345 | struct sk_filter { |
346 | atomic_t refcnt; | |
347 | struct rcu_head rcu; | |
348 | struct bpf_prog *prog; | |
349 | }; | |
350 | ||
351 | #define BPF_PROG_RUN(filter, ctx) (*filter->bpf_func)(ctx, filter->insnsi) | |
352 | ||
01dd194c DB |
353 | #define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN |
354 | ||
355 | static inline u8 *bpf_skb_cb(struct sk_buff *skb) | |
356 | { | |
357 | /* eBPF programs may read/write skb->cb[] area to transfer meta | |
358 | * data between tail calls. Since this also needs to work with | |
359 | * tc, that scratch memory is mapped to qdisc_skb_cb's data area. | |
360 | * | |
361 | * In some socket filter cases, the cb unfortunately needs to be | |
362 | * saved/restored so that protocol specific skb->cb[] data won't | |
363 | * be lost. In any case, due to unpriviledged eBPF programs | |
364 | * attached to sockets, we need to clear the bpf_skb_cb() area | |
365 | * to not leak previous contents to user space. | |
366 | */ | |
367 | BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != BPF_SKB_CB_LEN); | |
368 | BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != | |
369 | FIELD_SIZEOF(struct qdisc_skb_cb, data)); | |
370 | ||
371 | return qdisc_skb_cb(skb)->data; | |
372 | } | |
373 | ||
ff936a04 AS |
374 | static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog, |
375 | struct sk_buff *skb) | |
376 | { | |
01dd194c DB |
377 | u8 *cb_data = bpf_skb_cb(skb); |
378 | u8 cb_saved[BPF_SKB_CB_LEN]; | |
ff936a04 AS |
379 | u32 res; |
380 | ||
ff936a04 | 381 | if (unlikely(prog->cb_access)) { |
01dd194c DB |
382 | memcpy(cb_saved, cb_data, sizeof(cb_saved)); |
383 | memset(cb_data, 0, sizeof(cb_saved)); | |
ff936a04 AS |
384 | } |
385 | ||
386 | res = BPF_PROG_RUN(prog, skb); | |
387 | ||
388 | if (unlikely(prog->cb_access)) | |
01dd194c | 389 | memcpy(cb_data, cb_saved, sizeof(cb_saved)); |
ff936a04 AS |
390 | |
391 | return res; | |
392 | } | |
393 | ||
394 | static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog, | |
395 | struct sk_buff *skb) | |
396 | { | |
01dd194c | 397 | u8 *cb_data = bpf_skb_cb(skb); |
ff936a04 AS |
398 | |
399 | if (unlikely(prog->cb_access)) | |
01dd194c DB |
400 | memset(cb_data, 0, BPF_SKB_CB_LEN); |
401 | ||
ff936a04 AS |
402 | return BPF_PROG_RUN(prog, skb); |
403 | } | |
404 | ||
7ae457c1 | 405 | static inline unsigned int bpf_prog_size(unsigned int proglen) |
b715631f | 406 | { |
7ae457c1 AS |
407 | return max(sizeof(struct bpf_prog), |
408 | offsetof(struct bpf_prog, insns[proglen])); | |
b715631f SH |
409 | } |
410 | ||
7b36f929 DB |
411 | static inline bool bpf_prog_was_classic(const struct bpf_prog *prog) |
412 | { | |
413 | /* When classic BPF programs have been loaded and the arch | |
414 | * does not have a classic BPF JIT (anymore), they have been | |
415 | * converted via bpf_migrate_filter() to eBPF and thus always | |
416 | * have an unspec program type. | |
417 | */ | |
418 | return prog->type == BPF_PROG_TYPE_UNSPEC; | |
419 | } | |
420 | ||
009937e7 | 421 | #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0])) |
a3ea269b | 422 | |
60a3b225 DB |
423 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
424 | static inline void bpf_prog_lock_ro(struct bpf_prog *fp) | |
425 | { | |
426 | set_memory_ro((unsigned long)fp, fp->pages); | |
427 | } | |
428 | ||
429 | static inline void bpf_prog_unlock_ro(struct bpf_prog *fp) | |
430 | { | |
431 | set_memory_rw((unsigned long)fp, fp->pages); | |
432 | } | |
433 | #else | |
434 | static inline void bpf_prog_lock_ro(struct bpf_prog *fp) | |
435 | { | |
436 | } | |
437 | ||
438 | static inline void bpf_prog_unlock_ro(struct bpf_prog *fp) | |
439 | { | |
440 | } | |
441 | #endif /* CONFIG_DEBUG_SET_MODULE_RONX */ | |
442 | ||
fbc907f0 | 443 | int sk_filter(struct sock *sk, struct sk_buff *skb); |
bd4cf0ed | 444 | |
04fd61ab | 445 | int bpf_prog_select_runtime(struct bpf_prog *fp); |
7ae457c1 | 446 | void bpf_prog_free(struct bpf_prog *fp); |
bd4cf0ed | 447 | |
60a3b225 DB |
448 | struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags); |
449 | struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size, | |
450 | gfp_t gfp_extra_flags); | |
451 | void __bpf_prog_free(struct bpf_prog *fp); | |
452 | ||
453 | static inline void bpf_prog_unlock_free(struct bpf_prog *fp) | |
454 | { | |
455 | bpf_prog_unlock_ro(fp); | |
456 | __bpf_prog_free(fp); | |
457 | } | |
458 | ||
ac67eb2c DB |
459 | typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter, |
460 | unsigned int flen); | |
461 | ||
7ae457c1 | 462 | int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog); |
ac67eb2c | 463 | int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, |
bab18991 | 464 | bpf_aux_classic_check_t trans, bool save_orig); |
7ae457c1 | 465 | void bpf_prog_destroy(struct bpf_prog *fp); |
a3ea269b | 466 | |
fbc907f0 | 467 | int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk); |
5a5abb1f DB |
468 | int __sk_attach_filter(struct sock_fprog *fprog, struct sock *sk, |
469 | bool locked); | |
89aa0758 | 470 | int sk_attach_bpf(u32 ufd, struct sock *sk); |
538950a1 CG |
471 | int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk); |
472 | int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk); | |
fbc907f0 | 473 | int sk_detach_filter(struct sock *sk); |
5a5abb1f DB |
474 | int __sk_detach_filter(struct sock *sk, bool locked); |
475 | ||
fbc907f0 DB |
476 | int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, |
477 | unsigned int len); | |
fbc907f0 | 478 | |
278571ba | 479 | bool sk_filter_charge(struct sock *sk, struct sk_filter *fp); |
fbc907f0 | 480 | void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp); |
0a14842f | 481 | |
62258278 | 482 | u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); |
7ae457c1 | 483 | void bpf_int_jit_compile(struct bpf_prog *fp); |
4e10df9a | 484 | bool bpf_helper_changes_skb_data(void *func); |
62258278 | 485 | |
b954d834 DB |
486 | #ifdef CONFIG_BPF_JIT |
487 | typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size); | |
488 | ||
489 | struct bpf_binary_header * | |
490 | bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, | |
491 | unsigned int alignment, | |
492 | bpf_jit_fill_hole_t bpf_fill_ill_insns); | |
493 | void bpf_jit_binary_free(struct bpf_binary_header *hdr); | |
494 | ||
495 | void bpf_jit_compile(struct bpf_prog *fp); | |
496 | void bpf_jit_free(struct bpf_prog *fp); | |
497 | ||
498 | static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen, | |
499 | u32 pass, void *image) | |
500 | { | |
b13138ef DB |
501 | pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen, |
502 | proglen, pass, image, current->comm, task_pid_nr(current)); | |
503 | ||
b954d834 DB |
504 | if (image) |
505 | print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET, | |
506 | 16, 1, image, proglen, false); | |
507 | } | |
508 | #else | |
509 | static inline void bpf_jit_compile(struct bpf_prog *fp) | |
510 | { | |
511 | } | |
512 | ||
513 | static inline void bpf_jit_free(struct bpf_prog *fp) | |
514 | { | |
515 | bpf_prog_unlock_free(fp); | |
516 | } | |
517 | #endif /* CONFIG_BPF_JIT */ | |
518 | ||
34805931 DB |
519 | #define BPF_ANC BIT(15) |
520 | ||
55795ef5 RV |
521 | static inline bool bpf_needs_clear_a(const struct sock_filter *first) |
522 | { | |
523 | switch (first->code) { | |
524 | case BPF_RET | BPF_K: | |
525 | case BPF_LD | BPF_W | BPF_LEN: | |
526 | return false; | |
527 | ||
528 | case BPF_LD | BPF_W | BPF_ABS: | |
529 | case BPF_LD | BPF_H | BPF_ABS: | |
530 | case BPF_LD | BPF_B | BPF_ABS: | |
531 | if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X) | |
532 | return true; | |
533 | return false; | |
534 | ||
535 | default: | |
536 | return true; | |
537 | } | |
538 | } | |
539 | ||
34805931 DB |
540 | static inline u16 bpf_anc_helper(const struct sock_filter *ftest) |
541 | { | |
542 | BUG_ON(ftest->code & BPF_ANC); | |
543 | ||
544 | switch (ftest->code) { | |
545 | case BPF_LD | BPF_W | BPF_ABS: | |
546 | case BPF_LD | BPF_H | BPF_ABS: | |
547 | case BPF_LD | BPF_B | BPF_ABS: | |
548 | #define BPF_ANCILLARY(CODE) case SKF_AD_OFF + SKF_AD_##CODE: \ | |
549 | return BPF_ANC | SKF_AD_##CODE | |
550 | switch (ftest->k) { | |
551 | BPF_ANCILLARY(PROTOCOL); | |
552 | BPF_ANCILLARY(PKTTYPE); | |
553 | BPF_ANCILLARY(IFINDEX); | |
554 | BPF_ANCILLARY(NLATTR); | |
555 | BPF_ANCILLARY(NLATTR_NEST); | |
556 | BPF_ANCILLARY(MARK); | |
557 | BPF_ANCILLARY(QUEUE); | |
558 | BPF_ANCILLARY(HATYPE); | |
559 | BPF_ANCILLARY(RXHASH); | |
560 | BPF_ANCILLARY(CPU); | |
561 | BPF_ANCILLARY(ALU_XOR_X); | |
562 | BPF_ANCILLARY(VLAN_TAG); | |
563 | BPF_ANCILLARY(VLAN_TAG_PRESENT); | |
564 | BPF_ANCILLARY(PAY_OFFSET); | |
565 | BPF_ANCILLARY(RANDOM); | |
27cd5452 | 566 | BPF_ANCILLARY(VLAN_TPID); |
34805931 DB |
567 | } |
568 | /* Fallthrough. */ | |
569 | default: | |
570 | return ftest->code; | |
571 | } | |
572 | } | |
573 | ||
9f12fbe6 ZSL |
574 | void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb, |
575 | int k, unsigned int size); | |
576 | ||
577 | static inline void *bpf_load_pointer(const struct sk_buff *skb, int k, | |
578 | unsigned int size, void *buffer) | |
579 | { | |
580 | if (k >= 0) | |
581 | return skb_header_pointer(skb, k, size, buffer); | |
582 | ||
583 | return bpf_internal_load_pointer_neg_helper(skb, k, size); | |
584 | } | |
585 | ||
ea02f941 MS |
586 | static inline int bpf_tell_extensions(void) |
587 | { | |
37692299 | 588 | return SKF_AD_MAX; |
ea02f941 MS |
589 | } |
590 | ||
1da177e4 | 591 | #endif /* __LINUX_FILTER_H__ */ |