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TOMOYO Linux Cross Reference
Linux/include/linux/filter.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * Linux Socket Filter Data Structures
  4  */
  5 #ifndef __LINUX_FILTER_H__
  6 #define __LINUX_FILTER_H__
  7 
  8 #include <stdarg.h>
  9 
 10 #include <linux/atomic.h>
 11 #include <linux/refcount.h>
 12 #include <linux/compat.h>
 13 #include <linux/skbuff.h>
 14 #include <linux/linkage.h>
 15 #include <linux/printk.h>
 16 #include <linux/workqueue.h>
 17 #include <linux/sched.h>
 18 #include <linux/capability.h>
 19 #include <linux/cryptohash.h>
 20 #include <linux/set_memory.h>
 21 #include <linux/kallsyms.h>
 22 #include <linux/if_vlan.h>
 23 
 24 #include <net/sch_generic.h>
 25 
 26 #include <uapi/linux/filter.h>
 27 #include <uapi/linux/bpf.h>
 28 
 29 struct sk_buff;
 30 struct sock;
 31 struct seccomp_data;
 32 struct bpf_prog_aux;
 33 struct xdp_rxq_info;
 34 struct xdp_buff;
 35 struct sock_reuseport;
 36 
 37 /* ArgX, context and stack frame pointer register positions. Note,
 38  * Arg1, Arg2, Arg3, etc are used as argument mappings of function
 39  * calls in BPF_CALL instruction.
 40  */
 41 #define BPF_REG_ARG1    BPF_REG_1
 42 #define BPF_REG_ARG2    BPF_REG_2
 43 #define BPF_REG_ARG3    BPF_REG_3
 44 #define BPF_REG_ARG4    BPF_REG_4
 45 #define BPF_REG_ARG5    BPF_REG_5
 46 #define BPF_REG_CTX     BPF_REG_6
 47 #define BPF_REG_FP      BPF_REG_10
 48 
 49 /* Additional register mappings for converted user programs. */
 50 #define BPF_REG_A       BPF_REG_0
 51 #define BPF_REG_X       BPF_REG_7
 52 #define BPF_REG_TMP     BPF_REG_2       /* scratch reg */
 53 #define BPF_REG_D       BPF_REG_8       /* data, callee-saved */
 54 #define BPF_REG_H       BPF_REG_9       /* hlen, callee-saved */
 55 
 56 /* Kernel hidden auxiliary/helper register for hardening step.
 57  * Only used by eBPF JITs. It's nothing more than a temporary
 58  * register that JITs use internally, only that here it's part
 59  * of eBPF instructions that have been rewritten for blinding
 60  * constants. See JIT pre-step in bpf_jit_blind_constants().
 61  */
 62 #define BPF_REG_AX              MAX_BPF_REG
 63 #define MAX_BPF_JIT_REG         (MAX_BPF_REG + 1)
 64 
 65 /* unused opcode to mark special call to bpf_tail_call() helper */
 66 #define BPF_TAIL_CALL   0xf0
 67 
 68 /* unused opcode to mark call to interpreter with arguments */
 69 #define BPF_CALL_ARGS   0xe0
 70 
 71 /* As per nm, we expose JITed images as text (code) section for
 72  * kallsyms. That way, tools like perf can find it to match
 73  * addresses.
 74  */
 75 #define BPF_SYM_ELF_TYPE        't'
 76 
 77 /* BPF program can access up to 512 bytes of stack space. */
 78 #define MAX_BPF_STACK   512
 79 
 80 /* Helper macros for filter block array initializers. */
 81 
 82 /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
 83 
 84 #define BPF_ALU64_REG(OP, DST, SRC)                             \
 85         ((struct bpf_insn) {                                    \
 86                 .code  = BPF_ALU64 | BPF_OP(OP) | BPF_X,        \
 87                 .dst_reg = DST,                                 \
 88                 .src_reg = SRC,                                 \
 89                 .off   = 0,                                     \
 90                 .imm   = 0 })
 91 
 92 #define BPF_ALU32_REG(OP, DST, SRC)                             \
 93         ((struct bpf_insn) {                                    \
 94                 .code  = BPF_ALU | BPF_OP(OP) | BPF_X,          \
 95                 .dst_reg = DST,                                 \
 96                 .src_reg = SRC,                                 \
 97                 .off   = 0,                                     \
 98                 .imm   = 0 })
 99 
100 /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
101 
102 #define BPF_ALU64_IMM(OP, DST, IMM)                             \
103         ((struct bpf_insn) {                                    \
104                 .code  = BPF_ALU64 | BPF_OP(OP) | BPF_K,        \
105                 .dst_reg = DST,                                 \
106                 .src_reg = 0,                                   \
107                 .off   = 0,                                     \
108                 .imm   = IMM })
109 
110 #define BPF_ALU32_IMM(OP, DST, IMM)                             \
111         ((struct bpf_insn) {                                    \
112                 .code  = BPF_ALU | BPF_OP(OP) | BPF_K,          \
113                 .dst_reg = DST,                                 \
114                 .src_reg = 0,                                   \
115                 .off   = 0,                                     \
116                 .imm   = IMM })
117 
118 /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */
119 
120 #define BPF_ENDIAN(TYPE, DST, LEN)                              \
121         ((struct bpf_insn) {                                    \
122                 .code  = BPF_ALU | BPF_END | BPF_SRC(TYPE),     \
123                 .dst_reg = DST,                                 \
124                 .src_reg = 0,                                   \
125                 .off   = 0,                                     \
126                 .imm   = LEN })
127 
128 /* Short form of mov, dst_reg = src_reg */
129 
130 #define BPF_MOV64_REG(DST, SRC)                                 \
131         ((struct bpf_insn) {                                    \
132                 .code  = BPF_ALU64 | BPF_MOV | BPF_X,           \
133                 .dst_reg = DST,                                 \
134                 .src_reg = SRC,                                 \
135                 .off   = 0,                                     \
136                 .imm   = 0 })
137 
138 #define BPF_MOV32_REG(DST, SRC)                                 \
139         ((struct bpf_insn) {                                    \
140                 .code  = BPF_ALU | BPF_MOV | BPF_X,             \
141                 .dst_reg = DST,                                 \
142                 .src_reg = SRC,                                 \
143                 .off   = 0,                                     \
144                 .imm   = 0 })
145 
146 /* Short form of mov, dst_reg = imm32 */
147 
148 #define BPF_MOV64_IMM(DST, IMM)                                 \
149         ((struct bpf_insn) {                                    \
150                 .code  = BPF_ALU64 | BPF_MOV | BPF_K,           \
151                 .dst_reg = DST,                                 \
152                 .src_reg = 0,                                   \
153                 .off   = 0,                                     \
154                 .imm   = IMM })
155 
156 #define BPF_MOV32_IMM(DST, IMM)                                 \
157         ((struct bpf_insn) {                                    \
158                 .code  = BPF_ALU | BPF_MOV | BPF_K,             \
159                 .dst_reg = DST,                                 \
160                 .src_reg = 0,                                   \
161                 .off   = 0,                                     \
162                 .imm   = IMM })
163 
164 /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
165 #define BPF_LD_IMM64(DST, IMM)                                  \
166         BPF_LD_IMM64_RAW(DST, 0, IMM)
167 
168 #define BPF_LD_IMM64_RAW(DST, SRC, IMM)                         \
169         ((struct bpf_insn) {                                    \
170                 .code  = BPF_LD | BPF_DW | BPF_IMM,             \
171                 .dst_reg = DST,                                 \
172                 .src_reg = SRC,                                 \
173                 .off   = 0,                                     \
174                 .imm   = (__u32) (IMM) }),                      \
175         ((struct bpf_insn) {                                    \
176                 .code  = 0, /* zero is reserved opcode */       \
177                 .dst_reg = 0,                                   \
178                 .src_reg = 0,                                   \
179                 .off   = 0,                                     \
180                 .imm   = ((__u64) (IMM)) >> 32 })
181 
182 /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
183 #define BPF_LD_MAP_FD(DST, MAP_FD)                              \
184         BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
185 
186 /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */
187 
188 #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM)                      \
189         ((struct bpf_insn) {                                    \
190                 .code  = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE),   \
191                 .dst_reg = DST,                                 \
192                 .src_reg = SRC,                                 \
193                 .off   = 0,                                     \
194                 .imm   = IMM })
195 
196 #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM)                      \
197         ((struct bpf_insn) {                                    \
198                 .code  = BPF_ALU | BPF_MOV | BPF_SRC(TYPE),     \
199                 .dst_reg = DST,                                 \
200                 .src_reg = SRC,                                 \
201                 .off   = 0,                                     \
202                 .imm   = IMM })
203 
204 /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
205 
206 #define BPF_LD_ABS(SIZE, IMM)                                   \
207         ((struct bpf_insn) {                                    \
208                 .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS,     \
209                 .dst_reg = 0,                                   \
210                 .src_reg = 0,                                   \
211                 .off   = 0,                                     \
212                 .imm   = IMM })
213 
214 /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */
215 
216 #define BPF_LD_IND(SIZE, SRC, IMM)                              \
217         ((struct bpf_insn) {                                    \
218                 .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_IND,     \
219                 .dst_reg = 0,                                   \
220                 .src_reg = SRC,                                 \
221                 .off   = 0,                                     \
222                 .imm   = IMM })
223 
224 /* Memory load, dst_reg = *(uint *) (src_reg + off16) */
225 
226 #define BPF_LDX_MEM(SIZE, DST, SRC, OFF)                        \
227         ((struct bpf_insn) {                                    \
228                 .code  = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM,    \
229                 .dst_reg = DST,                                 \
230                 .src_reg = SRC,                                 \
231                 .off   = OFF,                                   \
232                 .imm   = 0 })
233 
234 /* Memory store, *(uint *) (dst_reg + off16) = src_reg */
235 
236 #define BPF_STX_MEM(SIZE, DST, SRC, OFF)                        \
237         ((struct bpf_insn) {                                    \
238                 .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM,    \
239                 .dst_reg = DST,                                 \
240                 .src_reg = SRC,                                 \
241                 .off   = OFF,                                   \
242                 .imm   = 0 })
243 
244 /* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */
245 
246 #define BPF_STX_XADD(SIZE, DST, SRC, OFF)                       \
247         ((struct bpf_insn) {                                    \
248                 .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD,   \
249                 .dst_reg = DST,                                 \
250                 .src_reg = SRC,                                 \
251                 .off   = OFF,                                   \
252                 .imm   = 0 })
253 
254 /* Memory store, *(uint *) (dst_reg + off16) = imm32 */
255 
256 #define BPF_ST_MEM(SIZE, DST, OFF, IMM)                         \
257         ((struct bpf_insn) {                                    \
258                 .code  = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM,     \
259                 .dst_reg = DST,                                 \
260                 .src_reg = 0,                                   \
261                 .off   = OFF,                                   \
262                 .imm   = IMM })
263 
264 /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
265 
266 #define BPF_JMP_REG(OP, DST, SRC, OFF)                          \
267         ((struct bpf_insn) {                                    \
268                 .code  = BPF_JMP | BPF_OP(OP) | BPF_X,          \
269                 .dst_reg = DST,                                 \
270                 .src_reg = SRC,                                 \
271                 .off   = OFF,                                   \
272                 .imm   = 0 })
273 
274 /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
275 
276 #define BPF_JMP_IMM(OP, DST, IMM, OFF)                          \
277         ((struct bpf_insn) {                                    \
278                 .code  = BPF_JMP | BPF_OP(OP) | BPF_K,          \
279                 .dst_reg = DST,                                 \
280                 .src_reg = 0,                                   \
281                 .off   = OFF,                                   \
282                 .imm   = IMM })
283 
284 /* Unconditional jumps, goto pc + off16 */
285 
286 #define BPF_JMP_A(OFF)                                          \
287         ((struct bpf_insn) {                                    \
288                 .code  = BPF_JMP | BPF_JA,                      \
289                 .dst_reg = 0,                                   \
290                 .src_reg = 0,                                   \
291                 .off   = OFF,                                   \
292                 .imm   = 0 })
293 
294 /* Relative call */
295 
296 #define BPF_CALL_REL(TGT)                                       \
297         ((struct bpf_insn) {                                    \
298                 .code  = BPF_JMP | BPF_CALL,                    \
299                 .dst_reg = 0,                                   \
300                 .src_reg = BPF_PSEUDO_CALL,                     \
301                 .off   = 0,                                     \
302                 .imm   = TGT })
303 
304 /* Function call */
305 
306 #define BPF_CAST_CALL(x)                                        \
307                 ((u64 (*)(u64, u64, u64, u64, u64))(x))
308 
309 #define BPF_EMIT_CALL(FUNC)                                     \
310         ((struct bpf_insn) {                                    \
311                 .code  = BPF_JMP | BPF_CALL,                    \
312                 .dst_reg = 0,                                   \
313                 .src_reg = 0,                                   \
314                 .off   = 0,                                     \
315                 .imm   = ((FUNC) - __bpf_call_base) })
316 
317 /* Raw code statement block */
318 
319 #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM)                  \
320         ((struct bpf_insn) {                                    \
321                 .code  = CODE,                                  \
322                 .dst_reg = DST,                                 \
323                 .src_reg = SRC,                                 \
324                 .off   = OFF,                                   \
325                 .imm   = IMM })
326 
327 /* Program exit */
328 
329 #define BPF_EXIT_INSN()                                         \
330         ((struct bpf_insn) {                                    \
331                 .code  = BPF_JMP | BPF_EXIT,                    \
332                 .dst_reg = 0,                                   \
333                 .src_reg = 0,                                   \
334                 .off   = 0,                                     \
335                 .imm   = 0 })
336 
337 /* Internal classic blocks for direct assignment */
338 
339 #define __BPF_STMT(CODE, K)                                     \
340         ((struct sock_filter) BPF_STMT(CODE, K))
341 
342 #define __BPF_JUMP(CODE, K, JT, JF)                             \
343         ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF))
344 
345 #define bytes_to_bpf_size(bytes)                                \
346 ({                                                              \
347         int bpf_size = -EINVAL;                                 \
348                                                                 \
349         if (bytes == sizeof(u8))                                \
350                 bpf_size = BPF_B;                               \
351         else if (bytes == sizeof(u16))                          \
352                 bpf_size = BPF_H;                               \
353         else if (bytes == sizeof(u32))                          \
354                 bpf_size = BPF_W;                               \
355         else if (bytes == sizeof(u64))                          \
356                 bpf_size = BPF_DW;                              \
357                                                                 \
358         bpf_size;                                               \
359 })
360 
361 #define bpf_size_to_bytes(bpf_size)                             \
362 ({                                                              \
363         int bytes = -EINVAL;                                    \
364                                                                 \
365         if (bpf_size == BPF_B)                                  \
366                 bytes = sizeof(u8);                             \
367         else if (bpf_size == BPF_H)                             \
368                 bytes = sizeof(u16);                            \
369         else if (bpf_size == BPF_W)                             \
370                 bytes = sizeof(u32);                            \
371         else if (bpf_size == BPF_DW)                            \
372                 bytes = sizeof(u64);                            \
373                                                                 \
374         bytes;                                                  \
375 })
376 
377 #define BPF_SIZEOF(type)                                        \
378         ({                                                      \
379                 const int __size = bytes_to_bpf_size(sizeof(type)); \
380                 BUILD_BUG_ON(__size < 0);                       \
381                 __size;                                         \
382         })
383 
384 #define BPF_FIELD_SIZEOF(type, field)                           \
385         ({                                                      \
386                 const int __size = bytes_to_bpf_size(FIELD_SIZEOF(type, field)); \
387                 BUILD_BUG_ON(__size < 0);                       \
388                 __size;                                         \
389         })
390 
391 #define BPF_LDST_BYTES(insn)                                    \
392         ({                                                      \
393                 const int __size = bpf_size_to_bytes(BPF_SIZE((insn)->code)); \
394                 WARN_ON(__size < 0);                            \
395                 __size;                                         \
396         })
397 
398 #define __BPF_MAP_0(m, v, ...) v
399 #define __BPF_MAP_1(m, v, t, a, ...) m(t, a)
400 #define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__)
401 #define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__)
402 #define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__)
403 #define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__)
404 
405 #define __BPF_REG_0(...) __BPF_PAD(5)
406 #define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4)
407 #define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3)
408 #define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2)
409 #define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1)
410 #define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__)
411 
412 #define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__)
413 #define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__)
414 
415 #define __BPF_CAST(t, a)                                                       \
416         (__force t)                                                            \
417         (__force                                                               \
418          typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long),      \
419                                       (unsigned long)0, (t)0))) a
420 #define __BPF_V void
421 #define __BPF_N
422 
423 #define __BPF_DECL_ARGS(t, a) t   a
424 #define __BPF_DECL_REGS(t, a) u64 a
425 
426 #define __BPF_PAD(n)                                                           \
427         __BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2,       \
428                   u64, __ur_3, u64, __ur_4, u64, __ur_5)
429 
430 #define BPF_CALL_x(x, name, ...)                                               \
431         static __always_inline                                                 \
432         u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__));   \
433         u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__));         \
434         u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__))          \
435         {                                                                      \
436                 return ____##name(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\
437         }                                                                      \
438         static __always_inline                                                 \
439         u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__))
440 
441 #define BPF_CALL_0(name, ...)   BPF_CALL_x(0, name, __VA_ARGS__)
442 #define BPF_CALL_1(name, ...)   BPF_CALL_x(1, name, __VA_ARGS__)
443 #define BPF_CALL_2(name, ...)   BPF_CALL_x(2, name, __VA_ARGS__)
444 #define BPF_CALL_3(name, ...)   BPF_CALL_x(3, name, __VA_ARGS__)
445 #define BPF_CALL_4(name, ...)   BPF_CALL_x(4, name, __VA_ARGS__)
446 #define BPF_CALL_5(name, ...)   BPF_CALL_x(5, name, __VA_ARGS__)
447 
448 #define bpf_ctx_range(TYPE, MEMBER)                                             \
449         offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
450 #define bpf_ctx_range_till(TYPE, MEMBER1, MEMBER2)                              \
451         offsetof(TYPE, MEMBER1) ... offsetofend(TYPE, MEMBER2) - 1
452 #if BITS_PER_LONG == 64
453 # define bpf_ctx_range_ptr(TYPE, MEMBER)                                        \
454         offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
455 #else
456 # define bpf_ctx_range_ptr(TYPE, MEMBER)                                        \
457         offsetof(TYPE, MEMBER) ... offsetof(TYPE, MEMBER) + 8 - 1
458 #endif /* BITS_PER_LONG == 64 */
459 
460 #define bpf_target_off(TYPE, MEMBER, SIZE, PTR_SIZE)                            \
461         ({                                                                      \
462                 BUILD_BUG_ON(FIELD_SIZEOF(TYPE, MEMBER) != (SIZE));             \
463                 *(PTR_SIZE) = (SIZE);                                           \
464                 offsetof(TYPE, MEMBER);                                         \
465         })
466 
467 #ifdef CONFIG_COMPAT
468 /* A struct sock_filter is architecture independent. */
469 struct compat_sock_fprog {
470         u16             len;
471         compat_uptr_t   filter; /* struct sock_filter * */
472 };
473 #endif
474 
475 struct sock_fprog_kern {
476         u16                     len;
477         struct sock_filter      *filter;
478 };
479 
480 struct bpf_binary_header {
481         u32 pages;
482         /* Some arches need word alignment for their instructions */
483         u8 image[] __aligned(4);
484 };
485 
486 struct bpf_prog {
487         u16                     pages;          /* Number of allocated pages */
488         u16                     jited:1,        /* Is our filter JIT'ed? */
489                                 jit_requested:1,/* archs need to JIT the prog */
490                                 undo_set_mem:1, /* Passed set_memory_ro() checkpoint */
491                                 gpl_compatible:1, /* Is filter GPL compatible? */
492                                 cb_access:1,    /* Is control block accessed? */
493                                 dst_needed:1,   /* Do we need dst entry? */
494                                 blinded:1,      /* Was blinded */
495                                 is_func:1,      /* program is a bpf function */
496                                 kprobe_override:1, /* Do we override a kprobe? */
497                                 has_callchain_buf:1; /* callchain buffer allocated? */
498         enum bpf_prog_type      type;           /* Type of BPF program */
499         enum bpf_attach_type    expected_attach_type; /* For some prog types */
500         u32                     len;            /* Number of filter blocks */
501         u32                     jited_len;      /* Size of jited insns in bytes */
502         u8                      tag[BPF_TAG_SIZE];
503         struct bpf_prog_aux     *aux;           /* Auxiliary fields */
504         struct sock_fprog_kern  *orig_prog;     /* Original BPF program */
505         unsigned int            (*bpf_func)(const void *ctx,
506                                             const struct bpf_insn *insn);
507         /* Instructions for interpreter */
508         union {
509                 struct sock_filter      insns[0];
510                 struct bpf_insn         insnsi[0];
511         };
512 };
513 
514 struct sk_filter {
515         refcount_t      refcnt;
516         struct rcu_head rcu;
517         struct bpf_prog *prog;
518 };
519 
520 #define BPF_PROG_RUN(filter, ctx)  (*(filter)->bpf_func)(ctx, (filter)->insnsi)
521 
522 #define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN
523 
524 struct bpf_skb_data_end {
525         struct qdisc_skb_cb qdisc_cb;
526         void *data_meta;
527         void *data_end;
528 };
529 
530 struct bpf_redirect_info {
531         u32 ifindex;
532         u32 flags;
533         struct bpf_map *map;
534         struct bpf_map *map_to_flush;
535         u32 kern_flags;
536 };
537 
538 DECLARE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info);
539 
540 /* flags for bpf_redirect_info kern_flags */
541 #define BPF_RI_F_RF_NO_DIRECT   BIT(0)  /* no napi_direct on return_frame */
542 
543 /* Compute the linear packet data range [data, data_end) which
544  * will be accessed by various program types (cls_bpf, act_bpf,
545  * lwt, ...). Subsystems allowing direct data access must (!)
546  * ensure that cb[] area can be written to when BPF program is
547  * invoked (otherwise cb[] save/restore is necessary).
548  */
549 static inline void bpf_compute_data_pointers(struct sk_buff *skb)
550 {
551         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
552 
553         BUILD_BUG_ON(sizeof(*cb) > FIELD_SIZEOF(struct sk_buff, cb));
554         cb->data_meta = skb->data - skb_metadata_len(skb);
555         cb->data_end  = skb->data + skb_headlen(skb);
556 }
557 
558 /* Similar to bpf_compute_data_pointers(), except that save orginal
559  * data in cb->data and cb->meta_data for restore.
560  */
561 static inline void bpf_compute_and_save_data_end(
562         struct sk_buff *skb, void **saved_data_end)
563 {
564         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
565 
566         *saved_data_end = cb->data_end;
567         cb->data_end  = skb->data + skb_headlen(skb);
568 }
569 
570 /* Restore data saved by bpf_compute_data_pointers(). */
571 static inline void bpf_restore_data_end(
572         struct sk_buff *skb, void *saved_data_end)
573 {
574         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
575 
576         cb->data_end = saved_data_end;
577 }
578 
579 static inline u8 *bpf_skb_cb(struct sk_buff *skb)
580 {
581         /* eBPF programs may read/write skb->cb[] area to transfer meta
582          * data between tail calls. Since this also needs to work with
583          * tc, that scratch memory is mapped to qdisc_skb_cb's data area.
584          *
585          * In some socket filter cases, the cb unfortunately needs to be
586          * saved/restored so that protocol specific skb->cb[] data won't
587          * be lost. In any case, due to unpriviledged eBPF programs
588          * attached to sockets, we need to clear the bpf_skb_cb() area
589          * to not leak previous contents to user space.
590          */
591         BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != BPF_SKB_CB_LEN);
592         BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) !=
593                      FIELD_SIZEOF(struct qdisc_skb_cb, data));
594 
595         return qdisc_skb_cb(skb)->data;
596 }
597 
598 static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
599                                        struct sk_buff *skb)
600 {
601         u8 *cb_data = bpf_skb_cb(skb);
602         u8 cb_saved[BPF_SKB_CB_LEN];
603         u32 res;
604 
605         if (unlikely(prog->cb_access)) {
606                 memcpy(cb_saved, cb_data, sizeof(cb_saved));
607                 memset(cb_data, 0, sizeof(cb_saved));
608         }
609 
610         res = BPF_PROG_RUN(prog, skb);
611 
612         if (unlikely(prog->cb_access))
613                 memcpy(cb_data, cb_saved, sizeof(cb_saved));
614 
615         return res;
616 }
617 
618 static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog,
619                                         struct sk_buff *skb)
620 {
621         u8 *cb_data = bpf_skb_cb(skb);
622 
623         if (unlikely(prog->cb_access))
624                 memset(cb_data, 0, BPF_SKB_CB_LEN);
625 
626         return BPF_PROG_RUN(prog, skb);
627 }
628 
629 static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
630                                             struct xdp_buff *xdp)
631 {
632         /* Caller needs to hold rcu_read_lock() (!), otherwise program
633          * can be released while still running, or map elements could be
634          * freed early while still having concurrent users. XDP fastpath
635          * already takes rcu_read_lock() when fetching the program, so
636          * it's not necessary here anymore.
637          */
638         return BPF_PROG_RUN(prog, xdp);
639 }
640 
641 static inline u32 bpf_prog_insn_size(const struct bpf_prog *prog)
642 {
643         return prog->len * sizeof(struct bpf_insn);
644 }
645 
646 static inline u32 bpf_prog_tag_scratch_size(const struct bpf_prog *prog)
647 {
648         return round_up(bpf_prog_insn_size(prog) +
649                         sizeof(__be64) + 1, SHA_MESSAGE_BYTES);
650 }
651 
652 static inline unsigned int bpf_prog_size(unsigned int proglen)
653 {
654         return max(sizeof(struct bpf_prog),
655                    offsetof(struct bpf_prog, insns[proglen]));
656 }
657 
658 static inline bool bpf_prog_was_classic(const struct bpf_prog *prog)
659 {
660         /* When classic BPF programs have been loaded and the arch
661          * does not have a classic BPF JIT (anymore), they have been
662          * converted via bpf_migrate_filter() to eBPF and thus always
663          * have an unspec program type.
664          */
665         return prog->type == BPF_PROG_TYPE_UNSPEC;
666 }
667 
668 static inline u32 bpf_ctx_off_adjust_machine(u32 size)
669 {
670         const u32 size_machine = sizeof(unsigned long);
671 
672         if (size > size_machine && size % size_machine == 0)
673                 size = size_machine;
674 
675         return size;
676 }
677 
678 static inline bool bpf_ctx_narrow_align_ok(u32 off, u32 size_access,
679                                            u32 size_default)
680 {
681         size_default = bpf_ctx_off_adjust_machine(size_default);
682         size_access  = bpf_ctx_off_adjust_machine(size_access);
683 
684 #ifdef __LITTLE_ENDIAN
685         return (off & (size_default - 1)) == 0;
686 #else
687         return (off & (size_default - 1)) + size_access == size_default;
688 #endif
689 }
690 
691 static inline bool
692 bpf_ctx_narrow_access_ok(u32 off, u32 size, u32 size_default)
693 {
694         return bpf_ctx_narrow_align_ok(off, size, size_default) &&
695                size <= size_default && (size & (size - 1)) == 0;
696 }
697 
698 #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
699 
700 static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
701 {
702         fp->undo_set_mem = 1;
703         set_memory_ro((unsigned long)fp, fp->pages);
704 }
705 
706 static inline void bpf_prog_unlock_ro(struct bpf_prog *fp)
707 {
708         if (fp->undo_set_mem)
709                 set_memory_rw((unsigned long)fp, fp->pages);
710 }
711 
712 static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr)
713 {
714         set_memory_ro((unsigned long)hdr, hdr->pages);
715 }
716 
717 static inline void bpf_jit_binary_unlock_ro(struct bpf_binary_header *hdr)
718 {
719         set_memory_rw((unsigned long)hdr, hdr->pages);
720 }
721 
722 static inline struct bpf_binary_header *
723 bpf_jit_binary_hdr(const struct bpf_prog *fp)
724 {
725         unsigned long real_start = (unsigned long)fp->bpf_func;
726         unsigned long addr = real_start & PAGE_MASK;
727 
728         return (void *)addr;
729 }
730 
731 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap);
732 static inline int sk_filter(struct sock *sk, struct sk_buff *skb)
733 {
734         return sk_filter_trim_cap(sk, skb, 1);
735 }
736 
737 struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err);
738 void bpf_prog_free(struct bpf_prog *fp);
739 
740 bool bpf_opcode_in_insntable(u8 code);
741 
742 struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags);
743 struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
744                                   gfp_t gfp_extra_flags);
745 void __bpf_prog_free(struct bpf_prog *fp);
746 
747 static inline void bpf_prog_unlock_free(struct bpf_prog *fp)
748 {
749         bpf_prog_unlock_ro(fp);
750         __bpf_prog_free(fp);
751 }
752 
753 typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter,
754                                        unsigned int flen);
755 
756 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog);
757 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
758                               bpf_aux_classic_check_t trans, bool save_orig);
759 void bpf_prog_destroy(struct bpf_prog *fp);
760 
761 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
762 int sk_attach_bpf(u32 ufd, struct sock *sk);
763 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk);
764 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk);
765 void sk_reuseport_prog_free(struct bpf_prog *prog);
766 int sk_detach_filter(struct sock *sk);
767 int sk_get_filter(struct sock *sk, struct sock_filter __user *filter,
768                   unsigned int len);
769 
770 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp);
771 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);
772 
773 u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
774 #define __bpf_call_base_args \
775         ((u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)) \
776          __bpf_call_base)
777 
778 struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
779 void bpf_jit_compile(struct bpf_prog *prog);
780 bool bpf_helper_changes_pkt_data(void *func);
781 
782 static inline bool bpf_dump_raw_ok(void)
783 {
784         /* Reconstruction of call-sites is dependent on kallsyms,
785          * thus make dump the same restriction.
786          */
787         return kallsyms_show_value() == 1;
788 }
789 
790 struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
791                                        const struct bpf_insn *patch, u32 len);
792 
793 void bpf_clear_redirect_map(struct bpf_map *map);
794 
795 static inline bool xdp_return_frame_no_direct(void)
796 {
797         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
798 
799         return ri->kern_flags & BPF_RI_F_RF_NO_DIRECT;
800 }
801 
802 static inline void xdp_set_return_frame_no_direct(void)
803 {
804         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
805 
806         ri->kern_flags |= BPF_RI_F_RF_NO_DIRECT;
807 }
808 
809 static inline void xdp_clear_return_frame_no_direct(void)
810 {
811         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
812 
813         ri->kern_flags &= ~BPF_RI_F_RF_NO_DIRECT;
814 }
815 
816 static inline int xdp_ok_fwd_dev(const struct net_device *fwd,
817                                  unsigned int pktlen)
818 {
819         unsigned int len;
820 
821         if (unlikely(!(fwd->flags & IFF_UP)))
822                 return -ENETDOWN;
823 
824         len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN;
825         if (pktlen > len)
826                 return -EMSGSIZE;
827 
828         return 0;
829 }
830 
831 /* The pair of xdp_do_redirect and xdp_do_flush_map MUST be called in the
832  * same cpu context. Further for best results no more than a single map
833  * for the do_redirect/do_flush pair should be used. This limitation is
834  * because we only track one map and force a flush when the map changes.
835  * This does not appear to be a real limitation for existing software.
836  */
837 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
838                             struct xdp_buff *xdp, struct bpf_prog *prog);
839 int xdp_do_redirect(struct net_device *dev,
840                     struct xdp_buff *xdp,
841                     struct bpf_prog *prog);
842 void xdp_do_flush_map(void);
843 
844 void bpf_warn_invalid_xdp_action(u32 act);
845 
846 #ifdef CONFIG_INET
847 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
848                                   struct bpf_prog *prog, struct sk_buff *skb,
849                                   u32 hash);
850 #else
851 static inline struct sock *
852 bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
853                      struct bpf_prog *prog, struct sk_buff *skb,
854                      u32 hash)
855 {
856         return NULL;
857 }
858 #endif
859 
860 #ifdef CONFIG_BPF_JIT
861 extern int bpf_jit_enable;
862 extern int bpf_jit_harden;
863 extern int bpf_jit_kallsyms;
864 extern int bpf_jit_limit;
865 
866 typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size);
867 
868 struct bpf_binary_header *
869 bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
870                      unsigned int alignment,
871                      bpf_jit_fill_hole_t bpf_fill_ill_insns);
872 void bpf_jit_binary_free(struct bpf_binary_header *hdr);
873 
874 void bpf_jit_free(struct bpf_prog *fp);
875 
876 int bpf_jit_get_func_addr(const struct bpf_prog *prog,
877                           const struct bpf_insn *insn, bool extra_pass,
878                           u64 *func_addr, bool *func_addr_fixed);
879 
880 struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp);
881 void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other);
882 
883 static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
884                                 u32 pass, void *image)
885 {
886         pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen,
887                proglen, pass, image, current->comm, task_pid_nr(current));
888 
889         if (image)
890                 print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
891                                16, 1, image, proglen, false);
892 }
893 
894 static inline bool bpf_jit_is_ebpf(void)
895 {
896 # ifdef CONFIG_HAVE_EBPF_JIT
897         return true;
898 # else
899         return false;
900 # endif
901 }
902 
903 static inline bool ebpf_jit_enabled(void)
904 {
905         return bpf_jit_enable && bpf_jit_is_ebpf();
906 }
907 
908 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
909 {
910         return fp->jited && bpf_jit_is_ebpf();
911 }
912 
913 static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
914 {
915         /* These are the prerequisites, should someone ever have the
916          * idea to call blinding outside of them, we make sure to
917          * bail out.
918          */
919         if (!bpf_jit_is_ebpf())
920                 return false;
921         if (!prog->jit_requested)
922                 return false;
923         if (!bpf_jit_harden)
924                 return false;
925         if (bpf_jit_harden == 1 && capable(CAP_SYS_ADMIN))
926                 return false;
927 
928         return true;
929 }
930 
931 static inline bool bpf_jit_kallsyms_enabled(void)
932 {
933         /* There are a couple of corner cases where kallsyms should
934          * not be enabled f.e. on hardening.
935          */
936         if (bpf_jit_harden)
937                 return false;
938         if (!bpf_jit_kallsyms)
939                 return false;
940         if (bpf_jit_kallsyms == 1)
941                 return true;
942 
943         return false;
944 }
945 
946 const char *__bpf_address_lookup(unsigned long addr, unsigned long *size,
947                                  unsigned long *off, char *sym);
948 bool is_bpf_text_address(unsigned long addr);
949 int bpf_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
950                     char *sym);
951 
952 static inline const char *
953 bpf_address_lookup(unsigned long addr, unsigned long *size,
954                    unsigned long *off, char **modname, char *sym)
955 {
956         const char *ret = __bpf_address_lookup(addr, size, off, sym);
957 
958         if (ret && modname)
959                 *modname = NULL;
960         return ret;
961 }
962 
963 void bpf_prog_kallsyms_add(struct bpf_prog *fp);
964 void bpf_prog_kallsyms_del(struct bpf_prog *fp);
965 
966 #else /* CONFIG_BPF_JIT */
967 
968 static inline bool ebpf_jit_enabled(void)
969 {
970         return false;
971 }
972 
973 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
974 {
975         return false;
976 }
977 
978 static inline void bpf_jit_free(struct bpf_prog *fp)
979 {
980         bpf_prog_unlock_free(fp);
981 }
982 
983 static inline bool bpf_jit_kallsyms_enabled(void)
984 {
985         return false;
986 }
987 
988 static inline const char *
989 __bpf_address_lookup(unsigned long addr, unsigned long *size,
990                      unsigned long *off, char *sym)
991 {
992         return NULL;
993 }
994 
995 static inline bool is_bpf_text_address(unsigned long addr)
996 {
997         return false;
998 }
999 
1000 static inline int bpf_get_kallsym(unsigned int symnum, unsigned long *value,
1001                                   char *type, char *sym)
1002 {
1003         return -ERANGE;
1004 }
1005 
1006 static inline const char *
1007 bpf_address_lookup(unsigned long addr, unsigned long *size,
1008                    unsigned long *off, char **modname, char *sym)
1009 {
1010         return NULL;
1011 }
1012 
1013 static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp)
1014 {
1015 }
1016 
1017 static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp)
1018 {
1019 }
1020 #endif /* CONFIG_BPF_JIT */
1021 
1022 void bpf_prog_kallsyms_del_subprogs(struct bpf_prog *fp);
1023 void bpf_prog_kallsyms_del_all(struct bpf_prog *fp);
1024 
1025 #define BPF_ANC         BIT(15)
1026 
1027 static inline bool bpf_needs_clear_a(const struct sock_filter *first)
1028 {
1029         switch (first->code) {
1030         case BPF_RET | BPF_K:
1031         case BPF_LD | BPF_W | BPF_LEN:
1032                 return false;
1033 
1034         case BPF_LD | BPF_W | BPF_ABS:
1035         case BPF_LD | BPF_H | BPF_ABS:
1036         case BPF_LD | BPF_B | BPF_ABS:
1037                 if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X)
1038                         return true;
1039                 return false;
1040 
1041         default:
1042                 return true;
1043         }
1044 }
1045 
1046 static inline u16 bpf_anc_helper(const struct sock_filter *ftest)
1047 {
1048         BUG_ON(ftest->code & BPF_ANC);
1049 
1050         switch (ftest->code) {
1051         case BPF_LD | BPF_W | BPF_ABS:
1052         case BPF_LD | BPF_H | BPF_ABS:
1053         case BPF_LD | BPF_B | BPF_ABS:
1054 #define BPF_ANCILLARY(CODE)     case SKF_AD_OFF + SKF_AD_##CODE:        \
1055                                 return BPF_ANC | SKF_AD_##CODE
1056                 switch (ftest->k) {
1057                 BPF_ANCILLARY(PROTOCOL);
1058                 BPF_ANCILLARY(PKTTYPE);
1059                 BPF_ANCILLARY(IFINDEX);
1060                 BPF_ANCILLARY(NLATTR);
1061                 BPF_ANCILLARY(NLATTR_NEST);
1062                 BPF_ANCILLARY(MARK);
1063                 BPF_ANCILLARY(QUEUE);
1064                 BPF_ANCILLARY(HATYPE);
1065                 BPF_ANCILLARY(RXHASH);
1066                 BPF_ANCILLARY(CPU);
1067                 BPF_ANCILLARY(ALU_XOR_X);
1068                 BPF_ANCILLARY(VLAN_TAG);
1069                 BPF_ANCILLARY(VLAN_TAG_PRESENT);
1070                 BPF_ANCILLARY(PAY_OFFSET);
1071                 BPF_ANCILLARY(RANDOM);
1072                 BPF_ANCILLARY(VLAN_TPID);
1073                 }
1074                 /* Fallthrough. */
1075         default:
1076                 return ftest->code;
1077         }
1078 }
1079 
1080 void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb,
1081                                            int k, unsigned int size);
1082 
1083 static inline void *bpf_load_pointer(const struct sk_buff *skb, int k,
1084                                      unsigned int size, void *buffer)
1085 {
1086         if (k >= 0)
1087                 return skb_header_pointer(skb, k, size, buffer);
1088 
1089         return bpf_internal_load_pointer_neg_helper(skb, k, size);
1090 }
1091 
1092 static inline int bpf_tell_extensions(void)
1093 {
1094         return SKF_AD_MAX;
1095 }
1096 
1097 struct bpf_sock_addr_kern {
1098         struct sock *sk;
1099         struct sockaddr *uaddr;
1100         /* Temporary "register" to make indirect stores to nested structures
1101          * defined above. We need three registers to make such a store, but
1102          * only two (src and dst) are available at convert_ctx_access time
1103          */
1104         u64 tmp_reg;
1105         void *t_ctx;    /* Attach type specific context. */
1106 };
1107 
1108 struct bpf_sock_ops_kern {
1109         struct  sock *sk;
1110         u32     op;
1111         union {
1112                 u32 args[4];
1113                 u32 reply;
1114                 u32 replylong[4];
1115         };
1116         u32     is_fullsock;
1117         u64     temp;                   /* temp and everything after is not
1118                                          * initialized to 0 before calling
1119                                          * the BPF program. New fields that
1120                                          * should be initialized to 0 should
1121                                          * be inserted before temp.
1122                                          * temp is scratch storage used by
1123                                          * sock_ops_convert_ctx_access
1124                                          * as temporary storage of a register.
1125                                          */
1126 };
1127 
1128 #endif /* __LINUX_FILTER_H__ */
1129 

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