Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* |
3 | * Linux Socket Filter Data Structures | |
4 | */ | |
1da177e4 LT |
5 | #ifndef __LINUX_FILTER_H__ |
6 | #define __LINUX_FILTER_H__ | |
7 | ||
60063497 | 8 | #include <linux/atomic.h> |
8581fd40 | 9 | #include <linux/bpf.h> |
4c355cdf | 10 | #include <linux/refcount.h> |
0c5fe1b4 | 11 | #include <linux/compat.h> |
9f12fbe6 | 12 | #include <linux/skbuff.h> |
b954d834 DB |
13 | #include <linux/linkage.h> |
14 | #include <linux/printk.h> | |
d45ed4a4 | 15 | #include <linux/workqueue.h> |
b13138ef | 16 | #include <linux/sched.h> |
2870c4d6 | 17 | #include <linux/sched/clock.h> |
4f3446bb | 18 | #include <linux/capability.h> |
820a0b24 | 19 | #include <linux/set_memory.h> |
7105e828 | 20 | #include <linux/kallsyms.h> |
6d5fc195 | 21 | #include <linux/if_vlan.h> |
d53d2f78 | 22 | #include <linux/vmalloc.h> |
b1ea9ff6 | 23 | #include <linux/sockptr.h> |
a24d22b2 | 24 | #include <crypto/sha1.h> |
700d4796 | 25 | #include <linux/u64_stats_sync.h> |
4f3446bb | 26 | |
ff936a04 | 27 | #include <net/sch_generic.h> |
b954d834 | 28 | |
d9b8aada | 29 | #include <asm/byteorder.h> |
b954d834 | 30 | #include <uapi/linux/filter.h> |
60a3b225 DB |
31 | |
32 | struct sk_buff; | |
33 | struct sock; | |
34 | struct seccomp_data; | |
09756af4 | 35 | struct bpf_prog_aux; |
297dd12c | 36 | struct xdp_rxq_info; |
106ca27f | 37 | struct xdp_buff; |
2dbb9b9e | 38 | struct sock_reuseport; |
7b146ceb AI |
39 | struct ctl_table; |
40 | struct ctl_table_header; | |
792d4b5c | 41 | |
30743837 DB |
42 | /* ArgX, context and stack frame pointer register positions. Note, |
43 | * Arg1, Arg2, Arg3, etc are used as argument mappings of function | |
44 | * calls in BPF_CALL instruction. | |
45 | */ | |
46 | #define BPF_REG_ARG1 BPF_REG_1 | |
47 | #define BPF_REG_ARG2 BPF_REG_2 | |
48 | #define BPF_REG_ARG3 BPF_REG_3 | |
49 | #define BPF_REG_ARG4 BPF_REG_4 | |
50 | #define BPF_REG_ARG5 BPF_REG_5 | |
51 | #define BPF_REG_CTX BPF_REG_6 | |
52 | #define BPF_REG_FP BPF_REG_10 | |
53 | ||
54 | /* Additional register mappings for converted user programs. */ | |
55 | #define BPF_REG_A BPF_REG_0 | |
56 | #define BPF_REG_X BPF_REG_7 | |
e0cea7ce DB |
57 | #define BPF_REG_TMP BPF_REG_2 /* scratch reg */ |
58 | #define BPF_REG_D BPF_REG_8 /* data, callee-saved */ | |
59 | #define BPF_REG_H BPF_REG_9 /* hlen, callee-saved */ | |
bd4cf0ed | 60 | |
9b73bfdd | 61 | /* Kernel hidden auxiliary/helper register. */ |
4f3446bb | 62 | #define BPF_REG_AX MAX_BPF_REG |
144cd91c DB |
63 | #define MAX_BPF_EXT_REG (MAX_BPF_REG + 1) |
64 | #define MAX_BPF_JIT_REG MAX_BPF_EXT_REG | |
4f3446bb | 65 | |
71189fa9 AS |
66 | /* unused opcode to mark special call to bpf_tail_call() helper */ |
67 | #define BPF_TAIL_CALL 0xf0 | |
68 | ||
2a02759e AS |
69 | /* unused opcode to mark special load instruction. Same as BPF_ABS */ |
70 | #define BPF_PROBE_MEM 0x20 | |
71 | ||
1f9a1ea8 YS |
72 | /* unused opcode to mark special ldsx instruction. Same as BPF_IND */ |
73 | #define BPF_PROBE_MEMSX 0x40 | |
74 | ||
1ea47e01 AS |
75 | /* unused opcode to mark call to interpreter with arguments */ |
76 | #define BPF_CALL_ARGS 0xe0 | |
77 | ||
f5e81d11 DB |
78 | /* unused opcode to mark speculation barrier for mitigating |
79 | * Speculative Store Bypass | |
80 | */ | |
81 | #define BPF_NOSPEC 0xc0 | |
82 | ||
74451e66 DB |
83 | /* As per nm, we expose JITed images as text (code) section for |
84 | * kallsyms. That way, tools like perf can find it to match | |
85 | * addresses. | |
86 | */ | |
87 | #define BPF_SYM_ELF_TYPE 't' | |
88 | ||
bd4cf0ed AS |
89 | /* BPF program can access up to 512 bytes of stack space. */ |
90 | #define MAX_BPF_STACK 512 | |
91 | ||
f8f6d679 DB |
92 | /* Helper macros for filter block array initializers. */ |
93 | ||
e430f34e | 94 | /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */ |
f8f6d679 | 95 | |
7058e3a3 | 96 | #define BPF_ALU64_REG_OFF(OP, DST, SRC, OFF) \ |
2695fb55 | 97 | ((struct bpf_insn) { \ |
f8f6d679 | 98 | .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \ |
e430f34e AS |
99 | .dst_reg = DST, \ |
100 | .src_reg = SRC, \ | |
7058e3a3 | 101 | .off = OFF, \ |
f8f6d679 DB |
102 | .imm = 0 }) |
103 | ||
7058e3a3 YS |
104 | #define BPF_ALU64_REG(OP, DST, SRC) \ |
105 | BPF_ALU64_REG_OFF(OP, DST, SRC, 0) | |
106 | ||
107 | #define BPF_ALU32_REG_OFF(OP, DST, SRC, OFF) \ | |
2695fb55 | 108 | ((struct bpf_insn) { \ |
f8f6d679 | 109 | .code = BPF_ALU | BPF_OP(OP) | BPF_X, \ |
e430f34e AS |
110 | .dst_reg = DST, \ |
111 | .src_reg = SRC, \ | |
7058e3a3 | 112 | .off = OFF, \ |
f8f6d679 DB |
113 | .imm = 0 }) |
114 | ||
7058e3a3 YS |
115 | #define BPF_ALU32_REG(OP, DST, SRC) \ |
116 | BPF_ALU32_REG_OFF(OP, DST, SRC, 0) | |
117 | ||
e430f34e | 118 | /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */ |
f8f6d679 | 119 | |
daabb2b0 | 120 | #define BPF_ALU64_IMM_OFF(OP, DST, IMM, OFF) \ |
2695fb55 | 121 | ((struct bpf_insn) { \ |
f8f6d679 | 122 | .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
123 | .dst_reg = DST, \ |
124 | .src_reg = 0, \ | |
daabb2b0 | 125 | .off = OFF, \ |
f8f6d679 | 126 | .imm = IMM }) |
daabb2b0 PM |
127 | #define BPF_ALU64_IMM(OP, DST, IMM) \ |
128 | BPF_ALU64_IMM_OFF(OP, DST, IMM, 0) | |
f8f6d679 | 129 | |
daabb2b0 | 130 | #define BPF_ALU32_IMM_OFF(OP, DST, IMM, OFF) \ |
2695fb55 | 131 | ((struct bpf_insn) { \ |
f8f6d679 | 132 | .code = BPF_ALU | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
133 | .dst_reg = DST, \ |
134 | .src_reg = 0, \ | |
daabb2b0 | 135 | .off = OFF, \ |
f8f6d679 | 136 | .imm = IMM }) |
daabb2b0 PM |
137 | #define BPF_ALU32_IMM(OP, DST, IMM) \ |
138 | BPF_ALU32_IMM_OFF(OP, DST, IMM, 0) | |
f8f6d679 DB |
139 | |
140 | /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */ | |
141 | ||
e430f34e | 142 | #define BPF_ENDIAN(TYPE, DST, LEN) \ |
2695fb55 | 143 | ((struct bpf_insn) { \ |
f8f6d679 | 144 | .code = BPF_ALU | BPF_END | BPF_SRC(TYPE), \ |
e430f34e AS |
145 | .dst_reg = DST, \ |
146 | .src_reg = 0, \ | |
f8f6d679 DB |
147 | .off = 0, \ |
148 | .imm = LEN }) | |
149 | ||
daabb2b0 PM |
150 | /* Byte Swap, bswap16/32/64 */ |
151 | ||
152 | #define BPF_BSWAP(DST, LEN) \ | |
153 | ((struct bpf_insn) { \ | |
154 | .code = BPF_ALU64 | BPF_END | BPF_SRC(BPF_TO_LE), \ | |
155 | .dst_reg = DST, \ | |
156 | .src_reg = 0, \ | |
157 | .off = 0, \ | |
158 | .imm = LEN }) | |
159 | ||
e430f34e | 160 | /* Short form of mov, dst_reg = src_reg */ |
f8f6d679 | 161 | |
e430f34e | 162 | #define BPF_MOV64_REG(DST, SRC) \ |
2695fb55 | 163 | ((struct bpf_insn) { \ |
f8f6d679 | 164 | .code = BPF_ALU64 | BPF_MOV | BPF_X, \ |
e430f34e AS |
165 | .dst_reg = DST, \ |
166 | .src_reg = SRC, \ | |
f8f6d679 DB |
167 | .off = 0, \ |
168 | .imm = 0 }) | |
169 | ||
e430f34e | 170 | #define BPF_MOV32_REG(DST, SRC) \ |
2695fb55 | 171 | ((struct bpf_insn) { \ |
f8f6d679 | 172 | .code = BPF_ALU | BPF_MOV | BPF_X, \ |
e430f34e AS |
173 | .dst_reg = DST, \ |
174 | .src_reg = SRC, \ | |
f8f6d679 DB |
175 | .off = 0, \ |
176 | .imm = 0 }) | |
177 | ||
e430f34e | 178 | /* Short form of mov, dst_reg = imm32 */ |
f8f6d679 | 179 | |
e430f34e | 180 | #define BPF_MOV64_IMM(DST, IMM) \ |
2695fb55 | 181 | ((struct bpf_insn) { \ |
f8f6d679 | 182 | .code = BPF_ALU64 | BPF_MOV | BPF_K, \ |
e430f34e AS |
183 | .dst_reg = DST, \ |
184 | .src_reg = 0, \ | |
f8f6d679 DB |
185 | .off = 0, \ |
186 | .imm = IMM }) | |
187 | ||
e430f34e | 188 | #define BPF_MOV32_IMM(DST, IMM) \ |
2695fb55 | 189 | ((struct bpf_insn) { \ |
f8f6d679 | 190 | .code = BPF_ALU | BPF_MOV | BPF_K, \ |
e430f34e AS |
191 | .dst_reg = DST, \ |
192 | .src_reg = 0, \ | |
f8f6d679 DB |
193 | .off = 0, \ |
194 | .imm = IMM }) | |
195 | ||
daabb2b0 PM |
196 | /* Short form of movsx, dst_reg = (s8,s16,s32)src_reg */ |
197 | ||
198 | #define BPF_MOVSX64_REG(DST, SRC, OFF) \ | |
199 | ((struct bpf_insn) { \ | |
200 | .code = BPF_ALU64 | BPF_MOV | BPF_X, \ | |
201 | .dst_reg = DST, \ | |
202 | .src_reg = SRC, \ | |
203 | .off = OFF, \ | |
204 | .imm = 0 }) | |
205 | ||
206 | #define BPF_MOVSX32_REG(DST, SRC, OFF) \ | |
207 | ((struct bpf_insn) { \ | |
208 | .code = BPF_ALU | BPF_MOV | BPF_X, \ | |
209 | .dst_reg = DST, \ | |
210 | .src_reg = SRC, \ | |
211 | .off = OFF, \ | |
212 | .imm = 0 }) | |
213 | ||
7d134041 JW |
214 | /* Special form of mov32, used for doing explicit zero extension on dst. */ |
215 | #define BPF_ZEXT_REG(DST) \ | |
216 | ((struct bpf_insn) { \ | |
217 | .code = BPF_ALU | BPF_MOV | BPF_X, \ | |
218 | .dst_reg = DST, \ | |
219 | .src_reg = DST, \ | |
220 | .off = 0, \ | |
221 | .imm = 1 }) | |
222 | ||
223 | static inline bool insn_is_zext(const struct bpf_insn *insn) | |
224 | { | |
225 | return insn->code == (BPF_ALU | BPF_MOV | BPF_X) && insn->imm == 1; | |
226 | } | |
227 | ||
02ab695b AS |
228 | /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */ |
229 | #define BPF_LD_IMM64(DST, IMM) \ | |
230 | BPF_LD_IMM64_RAW(DST, 0, IMM) | |
231 | ||
232 | #define BPF_LD_IMM64_RAW(DST, SRC, IMM) \ | |
233 | ((struct bpf_insn) { \ | |
234 | .code = BPF_LD | BPF_DW | BPF_IMM, \ | |
235 | .dst_reg = DST, \ | |
236 | .src_reg = SRC, \ | |
237 | .off = 0, \ | |
238 | .imm = (__u32) (IMM) }), \ | |
239 | ((struct bpf_insn) { \ | |
240 | .code = 0, /* zero is reserved opcode */ \ | |
241 | .dst_reg = 0, \ | |
242 | .src_reg = 0, \ | |
243 | .off = 0, \ | |
244 | .imm = ((__u64) (IMM)) >> 32 }) | |
245 | ||
0246e64d AS |
246 | /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */ |
247 | #define BPF_LD_MAP_FD(DST, MAP_FD) \ | |
248 | BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD) | |
249 | ||
e430f34e | 250 | /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */ |
f8f6d679 | 251 | |
e430f34e | 252 | #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \ |
2695fb55 | 253 | ((struct bpf_insn) { \ |
f8f6d679 | 254 | .code = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE), \ |
e430f34e AS |
255 | .dst_reg = DST, \ |
256 | .src_reg = SRC, \ | |
f8f6d679 DB |
257 | .off = 0, \ |
258 | .imm = IMM }) | |
259 | ||
e430f34e | 260 | #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM) \ |
2695fb55 | 261 | ((struct bpf_insn) { \ |
f8f6d679 | 262 | .code = BPF_ALU | BPF_MOV | BPF_SRC(TYPE), \ |
e430f34e AS |
263 | .dst_reg = DST, \ |
264 | .src_reg = SRC, \ | |
f8f6d679 DB |
265 | .off = 0, \ |
266 | .imm = IMM }) | |
267 | ||
e430f34e | 268 | /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */ |
f8f6d679 | 269 | |
e430f34e | 270 | #define BPF_LD_ABS(SIZE, IMM) \ |
2695fb55 | 271 | ((struct bpf_insn) { \ |
f8f6d679 | 272 | .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \ |
e430f34e AS |
273 | .dst_reg = 0, \ |
274 | .src_reg = 0, \ | |
f8f6d679 | 275 | .off = 0, \ |
e430f34e | 276 | .imm = IMM }) |
f8f6d679 | 277 | |
e430f34e | 278 | /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */ |
f8f6d679 | 279 | |
e430f34e | 280 | #define BPF_LD_IND(SIZE, SRC, IMM) \ |
2695fb55 | 281 | ((struct bpf_insn) { \ |
f8f6d679 | 282 | .code = BPF_LD | BPF_SIZE(SIZE) | BPF_IND, \ |
e430f34e AS |
283 | .dst_reg = 0, \ |
284 | .src_reg = SRC, \ | |
f8f6d679 | 285 | .off = 0, \ |
e430f34e | 286 | .imm = IMM }) |
f8f6d679 | 287 | |
e430f34e | 288 | /* Memory load, dst_reg = *(uint *) (src_reg + off16) */ |
f8f6d679 | 289 | |
e430f34e | 290 | #define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \ |
2695fb55 | 291 | ((struct bpf_insn) { \ |
f8f6d679 | 292 | .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \ |
e430f34e AS |
293 | .dst_reg = DST, \ |
294 | .src_reg = SRC, \ | |
f8f6d679 DB |
295 | .off = OFF, \ |
296 | .imm = 0 }) | |
297 | ||
daabb2b0 PM |
298 | /* Memory load, dst_reg = *(signed size *) (src_reg + off16) */ |
299 | ||
300 | #define BPF_LDX_MEMSX(SIZE, DST, SRC, OFF) \ | |
301 | ((struct bpf_insn) { \ | |
302 | .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEMSX, \ | |
303 | .dst_reg = DST, \ | |
304 | .src_reg = SRC, \ | |
305 | .off = OFF, \ | |
306 | .imm = 0 }) | |
307 | ||
e430f34e AS |
308 | /* Memory store, *(uint *) (dst_reg + off16) = src_reg */ |
309 | ||
310 | #define BPF_STX_MEM(SIZE, DST, SRC, OFF) \ | |
2695fb55 | 311 | ((struct bpf_insn) { \ |
f8f6d679 | 312 | .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \ |
e430f34e AS |
313 | .dst_reg = DST, \ |
314 | .src_reg = SRC, \ | |
f8f6d679 DB |
315 | .off = OFF, \ |
316 | .imm = 0 }) | |
317 | ||
cffc642d | 318 | |
91c960b0 BJ |
319 | /* |
320 | * Atomic operations: | |
321 | * | |
322 | * BPF_ADD *(uint *) (dst_reg + off16) += src_reg | |
981f94c3 BJ |
323 | * BPF_AND *(uint *) (dst_reg + off16) &= src_reg |
324 | * BPF_OR *(uint *) (dst_reg + off16) |= src_reg | |
325 | * BPF_XOR *(uint *) (dst_reg + off16) ^= src_reg | |
5ca419f2 | 326 | * BPF_ADD | BPF_FETCH src_reg = atomic_fetch_add(dst_reg + off16, src_reg); |
981f94c3 BJ |
327 | * BPF_AND | BPF_FETCH src_reg = atomic_fetch_and(dst_reg + off16, src_reg); |
328 | * BPF_OR | BPF_FETCH src_reg = atomic_fetch_or(dst_reg + off16, src_reg); | |
329 | * BPF_XOR | BPF_FETCH src_reg = atomic_fetch_xor(dst_reg + off16, src_reg); | |
5ffa2550 BJ |
330 | * BPF_XCHG src_reg = atomic_xchg(dst_reg + off16, src_reg) |
331 | * BPF_CMPXCHG r0 = atomic_cmpxchg(dst_reg + off16, r0, src_reg) | |
91c960b0 BJ |
332 | */ |
333 | ||
334 | #define BPF_ATOMIC_OP(SIZE, OP, DST, SRC, OFF) \ | |
cffc642d | 335 | ((struct bpf_insn) { \ |
91c960b0 | 336 | .code = BPF_STX | BPF_SIZE(SIZE) | BPF_ATOMIC, \ |
cffc642d MH |
337 | .dst_reg = DST, \ |
338 | .src_reg = SRC, \ | |
339 | .off = OFF, \ | |
91c960b0 BJ |
340 | .imm = OP }) |
341 | ||
342 | /* Legacy alias */ | |
343 | #define BPF_STX_XADD(SIZE, DST, SRC, OFF) BPF_ATOMIC_OP(SIZE, BPF_ADD, DST, SRC, OFF) | |
cffc642d | 344 | |
e430f34e AS |
345 | /* Memory store, *(uint *) (dst_reg + off16) = imm32 */ |
346 | ||
347 | #define BPF_ST_MEM(SIZE, DST, OFF, IMM) \ | |
2695fb55 | 348 | ((struct bpf_insn) { \ |
e430f34e AS |
349 | .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \ |
350 | .dst_reg = DST, \ | |
351 | .src_reg = 0, \ | |
352 | .off = OFF, \ | |
353 | .imm = IMM }) | |
354 | ||
355 | /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */ | |
f8f6d679 | 356 | |
e430f34e | 357 | #define BPF_JMP_REG(OP, DST, SRC, OFF) \ |
2695fb55 | 358 | ((struct bpf_insn) { \ |
f8f6d679 | 359 | .code = BPF_JMP | BPF_OP(OP) | BPF_X, \ |
e430f34e AS |
360 | .dst_reg = DST, \ |
361 | .src_reg = SRC, \ | |
f8f6d679 DB |
362 | .off = OFF, \ |
363 | .imm = 0 }) | |
364 | ||
e430f34e | 365 | /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */ |
f8f6d679 | 366 | |
e430f34e | 367 | #define BPF_JMP_IMM(OP, DST, IMM, OFF) \ |
2695fb55 | 368 | ((struct bpf_insn) { \ |
f8f6d679 | 369 | .code = BPF_JMP | BPF_OP(OP) | BPF_K, \ |
e430f34e AS |
370 | .dst_reg = DST, \ |
371 | .src_reg = 0, \ | |
f8f6d679 | 372 | .off = OFF, \ |
a7b76c88 JW |
373 | .imm = IMM }) |
374 | ||
375 | /* Like BPF_JMP_REG, but with 32-bit wide operands for comparison. */ | |
376 | ||
377 | #define BPF_JMP32_REG(OP, DST, SRC, OFF) \ | |
378 | ((struct bpf_insn) { \ | |
379 | .code = BPF_JMP32 | BPF_OP(OP) | BPF_X, \ | |
380 | .dst_reg = DST, \ | |
381 | .src_reg = SRC, \ | |
382 | .off = OFF, \ | |
383 | .imm = 0 }) | |
384 | ||
385 | /* Like BPF_JMP_IMM, but with 32-bit wide operands for comparison. */ | |
386 | ||
387 | #define BPF_JMP32_IMM(OP, DST, IMM, OFF) \ | |
388 | ((struct bpf_insn) { \ | |
389 | .code = BPF_JMP32 | BPF_OP(OP) | BPF_K, \ | |
390 | .dst_reg = DST, \ | |
391 | .src_reg = 0, \ | |
392 | .off = OFF, \ | |
f8f6d679 DB |
393 | .imm = IMM }) |
394 | ||
614d0d77 DB |
395 | /* Unconditional jumps, goto pc + off16 */ |
396 | ||
397 | #define BPF_JMP_A(OFF) \ | |
398 | ((struct bpf_insn) { \ | |
399 | .code = BPF_JMP | BPF_JA, \ | |
400 | .dst_reg = 0, \ | |
401 | .src_reg = 0, \ | |
402 | .off = OFF, \ | |
403 | .imm = 0 }) | |
404 | ||
06be0864 DB |
405 | /* Relative call */ |
406 | ||
407 | #define BPF_CALL_REL(TGT) \ | |
408 | ((struct bpf_insn) { \ | |
409 | .code = BPF_JMP | BPF_CALL, \ | |
410 | .dst_reg = 0, \ | |
411 | .src_reg = BPF_PSEUDO_CALL, \ | |
412 | .off = 0, \ | |
413 | .imm = TGT }) | |
414 | ||
3d717fad | 415 | /* Convert function address to BPF immediate */ |
f8f6d679 | 416 | |
3d717fad | 417 | #define BPF_CALL_IMM(x) ((void *)(x) - (void *)__bpf_call_base) |
09772d92 | 418 | |
f8f6d679 | 419 | #define BPF_EMIT_CALL(FUNC) \ |
2695fb55 | 420 | ((struct bpf_insn) { \ |
f8f6d679 | 421 | .code = BPF_JMP | BPF_CALL, \ |
e430f34e AS |
422 | .dst_reg = 0, \ |
423 | .src_reg = 0, \ | |
f8f6d679 | 424 | .off = 0, \ |
3d717fad | 425 | .imm = BPF_CALL_IMM(FUNC) }) |
f8f6d679 DB |
426 | |
427 | /* Raw code statement block */ | |
428 | ||
e430f34e | 429 | #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \ |
2695fb55 | 430 | ((struct bpf_insn) { \ |
f8f6d679 | 431 | .code = CODE, \ |
e430f34e AS |
432 | .dst_reg = DST, \ |
433 | .src_reg = SRC, \ | |
f8f6d679 DB |
434 | .off = OFF, \ |
435 | .imm = IMM }) | |
436 | ||
437 | /* Program exit */ | |
438 | ||
439 | #define BPF_EXIT_INSN() \ | |
2695fb55 | 440 | ((struct bpf_insn) { \ |
f8f6d679 | 441 | .code = BPF_JMP | BPF_EXIT, \ |
e430f34e AS |
442 | .dst_reg = 0, \ |
443 | .src_reg = 0, \ | |
f8f6d679 DB |
444 | .off = 0, \ |
445 | .imm = 0 }) | |
446 | ||
f5e81d11 DB |
447 | /* Speculation barrier */ |
448 | ||
449 | #define BPF_ST_NOSPEC() \ | |
450 | ((struct bpf_insn) { \ | |
451 | .code = BPF_ST | BPF_NOSPEC, \ | |
452 | .dst_reg = 0, \ | |
453 | .src_reg = 0, \ | |
454 | .off = 0, \ | |
455 | .imm = 0 }) | |
456 | ||
a4afd37b DB |
457 | /* Internal classic blocks for direct assignment */ |
458 | ||
459 | #define __BPF_STMT(CODE, K) \ | |
460 | ((struct sock_filter) BPF_STMT(CODE, K)) | |
461 | ||
462 | #define __BPF_JUMP(CODE, K, JT, JF) \ | |
463 | ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF)) | |
464 | ||
f8f6d679 DB |
465 | #define bytes_to_bpf_size(bytes) \ |
466 | ({ \ | |
467 | int bpf_size = -EINVAL; \ | |
468 | \ | |
469 | if (bytes == sizeof(u8)) \ | |
470 | bpf_size = BPF_B; \ | |
471 | else if (bytes == sizeof(u16)) \ | |
472 | bpf_size = BPF_H; \ | |
473 | else if (bytes == sizeof(u32)) \ | |
474 | bpf_size = BPF_W; \ | |
475 | else if (bytes == sizeof(u64)) \ | |
476 | bpf_size = BPF_DW; \ | |
477 | \ | |
478 | bpf_size; \ | |
479 | }) | |
9739eef1 | 480 | |
f96da094 DB |
481 | #define bpf_size_to_bytes(bpf_size) \ |
482 | ({ \ | |
483 | int bytes = -EINVAL; \ | |
484 | \ | |
485 | if (bpf_size == BPF_B) \ | |
486 | bytes = sizeof(u8); \ | |
487 | else if (bpf_size == BPF_H) \ | |
488 | bytes = sizeof(u16); \ | |
489 | else if (bpf_size == BPF_W) \ | |
490 | bytes = sizeof(u32); \ | |
491 | else if (bpf_size == BPF_DW) \ | |
492 | bytes = sizeof(u64); \ | |
493 | \ | |
494 | bytes; \ | |
495 | }) | |
496 | ||
f035a515 DB |
497 | #define BPF_SIZEOF(type) \ |
498 | ({ \ | |
499 | const int __size = bytes_to_bpf_size(sizeof(type)); \ | |
500 | BUILD_BUG_ON(__size < 0); \ | |
501 | __size; \ | |
502 | }) | |
503 | ||
504 | #define BPF_FIELD_SIZEOF(type, field) \ | |
505 | ({ \ | |
c593642c | 506 | const int __size = bytes_to_bpf_size(sizeof_field(type, field)); \ |
f035a515 DB |
507 | BUILD_BUG_ON(__size < 0); \ |
508 | __size; \ | |
509 | }) | |
510 | ||
f96da094 DB |
511 | #define BPF_LDST_BYTES(insn) \ |
512 | ({ \ | |
e59ac634 | 513 | const int __size = bpf_size_to_bytes(BPF_SIZE((insn)->code)); \ |
f96da094 DB |
514 | WARN_ON(__size < 0); \ |
515 | __size; \ | |
516 | }) | |
517 | ||
f3694e00 DB |
518 | #define __BPF_MAP_0(m, v, ...) v |
519 | #define __BPF_MAP_1(m, v, t, a, ...) m(t, a) | |
520 | #define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__) | |
521 | #define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__) | |
522 | #define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__) | |
523 | #define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__) | |
524 | ||
525 | #define __BPF_REG_0(...) __BPF_PAD(5) | |
526 | #define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4) | |
527 | #define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3) | |
528 | #define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2) | |
529 | #define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1) | |
530 | #define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__) | |
531 | ||
532 | #define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__) | |
533 | #define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__) | |
534 | ||
535 | #define __BPF_CAST(t, a) \ | |
536 | (__force t) \ | |
537 | (__force \ | |
538 | typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long), \ | |
539 | (unsigned long)0, (t)0))) a | |
540 | #define __BPF_V void | |
541 | #define __BPF_N | |
542 | ||
543 | #define __BPF_DECL_ARGS(t, a) t a | |
544 | #define __BPF_DECL_REGS(t, a) u64 a | |
545 | ||
546 | #define __BPF_PAD(n) \ | |
547 | __BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2, \ | |
548 | u64, __ur_3, u64, __ur_4, u64, __ur_5) | |
549 | ||
550 | #define BPF_CALL_x(x, name, ...) \ | |
551 | static __always_inline \ | |
552 | u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)); \ | |
7c6a469e | 553 | typedef u64 (*btf_##name)(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)); \ |
f3694e00 DB |
554 | u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)); \ |
555 | u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)) \ | |
556 | { \ | |
7c6a469e | 557 | return ((btf_##name)____##name)(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\ |
f3694e00 DB |
558 | } \ |
559 | static __always_inline \ | |
560 | u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)) | |
561 | ||
562 | #define BPF_CALL_0(name, ...) BPF_CALL_x(0, name, __VA_ARGS__) | |
563 | #define BPF_CALL_1(name, ...) BPF_CALL_x(1, name, __VA_ARGS__) | |
564 | #define BPF_CALL_2(name, ...) BPF_CALL_x(2, name, __VA_ARGS__) | |
565 | #define BPF_CALL_3(name, ...) BPF_CALL_x(3, name, __VA_ARGS__) | |
566 | #define BPF_CALL_4(name, ...) BPF_CALL_x(4, name, __VA_ARGS__) | |
567 | #define BPF_CALL_5(name, ...) BPF_CALL_x(5, name, __VA_ARGS__) | |
568 | ||
f96da094 DB |
569 | #define bpf_ctx_range(TYPE, MEMBER) \ |
570 | offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1 | |
571 | #define bpf_ctx_range_till(TYPE, MEMBER1, MEMBER2) \ | |
572 | offsetof(TYPE, MEMBER1) ... offsetofend(TYPE, MEMBER2) - 1 | |
b7df9ada DB |
573 | #if BITS_PER_LONG == 64 |
574 | # define bpf_ctx_range_ptr(TYPE, MEMBER) \ | |
575 | offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1 | |
576 | #else | |
577 | # define bpf_ctx_range_ptr(TYPE, MEMBER) \ | |
578 | offsetof(TYPE, MEMBER) ... offsetof(TYPE, MEMBER) + 8 - 1 | |
579 | #endif /* BITS_PER_LONG == 64 */ | |
f96da094 DB |
580 | |
581 | #define bpf_target_off(TYPE, MEMBER, SIZE, PTR_SIZE) \ | |
582 | ({ \ | |
c593642c | 583 | BUILD_BUG_ON(sizeof_field(TYPE, MEMBER) != (SIZE)); \ |
f96da094 DB |
584 | *(PTR_SIZE) = (SIZE); \ |
585 | offsetof(TYPE, MEMBER); \ | |
586 | }) | |
587 | ||
bd4cf0ed | 588 | /* A struct sock_filter is architecture independent. */ |
0c5fe1b4 WD |
589 | struct compat_sock_fprog { |
590 | u16 len; | |
bd4cf0ed | 591 | compat_uptr_t filter; /* struct sock_filter * */ |
0c5fe1b4 | 592 | }; |
0c5fe1b4 | 593 | |
a3ea269b DB |
594 | struct sock_fprog_kern { |
595 | u16 len; | |
596 | struct sock_filter *filter; | |
597 | }; | |
598 | ||
b7b3fc8d IL |
599 | /* Some arches need doubleword alignment for their instructions and/or data */ |
600 | #define BPF_IMAGE_ALIGNMENT 8 | |
601 | ||
738cbe72 | 602 | struct bpf_binary_header { |
ed2d9e1a | 603 | u32 size; |
b7b3fc8d | 604 | u8 image[] __aligned(BPF_IMAGE_ALIGNMENT); |
738cbe72 DB |
605 | }; |
606 | ||
700d4796 | 607 | struct bpf_prog_stats { |
61a0abae ED |
608 | u64_stats_t cnt; |
609 | u64_stats_t nsecs; | |
610 | u64_stats_t misses; | |
700d4796 AS |
611 | struct u64_stats_sync syncp; |
612 | } __aligned(2 * sizeof(u64)); | |
613 | ||
7ae457c1 | 614 | struct sk_filter { |
4c355cdf | 615 | refcount_t refcnt; |
7ae457c1 AS |
616 | struct rcu_head rcu; |
617 | struct bpf_prog *prog; | |
618 | }; | |
619 | ||
492ecee8 AS |
620 | DECLARE_STATIC_KEY_FALSE(bpf_stats_enabled_key); |
621 | ||
fdf21497 | 622 | extern struct mutex nf_conn_btf_access_lock; |
6728aea7 KKD |
623 | extern int (*nfct_btf_struct_access)(struct bpf_verifier_log *log, |
624 | const struct bpf_reg_state *reg, | |
b7e852a9 | 625 | int off, int size); |
fdf21497 | 626 | |
fb7dd8bc AN |
627 | typedef unsigned int (*bpf_dispatcher_fn)(const void *ctx, |
628 | const struct bpf_insn *insnsi, | |
629 | unsigned int (*bpf_func)(const void *, | |
630 | const struct bpf_insn *)); | |
631 | ||
632 | static __always_inline u32 __bpf_prog_run(const struct bpf_prog *prog, | |
633 | const void *ctx, | |
634 | bpf_dispatcher_fn dfunc) | |
635 | { | |
636 | u32 ret; | |
637 | ||
638 | cant_migrate(); | |
639 | if (static_branch_unlikely(&bpf_stats_enabled_key)) { | |
640 | struct bpf_prog_stats *stats; | |
641 | u64 start = sched_clock(); | |
f941eadd | 642 | unsigned long flags; |
fb7dd8bc AN |
643 | |
644 | ret = dfunc(ctx, prog->insnsi, prog->bpf_func); | |
645 | stats = this_cpu_ptr(prog->stats); | |
f941eadd | 646 | flags = u64_stats_update_begin_irqsave(&stats->syncp); |
61a0abae ED |
647 | u64_stats_inc(&stats->cnt); |
648 | u64_stats_add(&stats->nsecs, sched_clock() - start); | |
f941eadd | 649 | u64_stats_update_end_irqrestore(&stats->syncp, flags); |
fb7dd8bc AN |
650 | } else { |
651 | ret = dfunc(ctx, prog->insnsi, prog->bpf_func); | |
652 | } | |
653 | return ret; | |
654 | } | |
655 | ||
656 | static __always_inline u32 bpf_prog_run(const struct bpf_prog *prog, const void *ctx) | |
657 | { | |
658 | return __bpf_prog_run(prog, ctx, bpf_dispatcher_nop_func); | |
659 | } | |
3c58482a TG |
660 | |
661 | /* | |
662 | * Use in preemptible and therefore migratable context to make sure that | |
663 | * the execution of the BPF program runs on one CPU. | |
664 | * | |
665 | * This uses migrate_disable/enable() explicitly to document that the | |
666 | * invocation of a BPF program does not require reentrancy protection | |
667 | * against a BPF program which is invoked from a preempting task. | |
3c58482a TG |
668 | */ |
669 | static inline u32 bpf_prog_run_pin_on_cpu(const struct bpf_prog *prog, | |
670 | const void *ctx) | |
671 | { | |
672 | u32 ret; | |
673 | ||
674 | migrate_disable(); | |
fb7dd8bc | 675 | ret = bpf_prog_run(prog, ctx); |
3c58482a TG |
676 | migrate_enable(); |
677 | return ret; | |
678 | } | |
7e6897f9 | 679 | |
01dd194c DB |
680 | #define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN |
681 | ||
db58ba45 AS |
682 | struct bpf_skb_data_end { |
683 | struct qdisc_skb_cb qdisc_cb; | |
de8f3a83 | 684 | void *data_meta; |
db58ba45 AS |
685 | void *data_end; |
686 | }; | |
687 | ||
ba452c9e THJ |
688 | struct bpf_nh_params { |
689 | u32 nh_family; | |
690 | union { | |
691 | u32 ipv4_nh; | |
692 | struct in6_addr ipv6_nh; | |
693 | }; | |
694 | }; | |
695 | ||
0b19cc0a | 696 | struct bpf_redirect_info { |
32637e33 | 697 | u64 tgt_index; |
43e74c02 | 698 | void *tgt_value; |
e624d4ed | 699 | struct bpf_map *map; |
32637e33 THJ |
700 | u32 flags; |
701 | u32 kern_flags; | |
ee75aef2 BT |
702 | u32 map_id; |
703 | enum bpf_map_type map_type; | |
ba452c9e | 704 | struct bpf_nh_params nh; |
0b19cc0a TM |
705 | }; |
706 | ||
707 | DECLARE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info); | |
708 | ||
2539650f TM |
709 | /* flags for bpf_redirect_info kern_flags */ |
710 | #define BPF_RI_F_RF_NO_DIRECT BIT(0) /* no napi_direct on return_frame */ | |
711 | ||
6aaae2b6 DB |
712 | /* Compute the linear packet data range [data, data_end) which |
713 | * will be accessed by various program types (cls_bpf, act_bpf, | |
714 | * lwt, ...). Subsystems allowing direct data access must (!) | |
715 | * ensure that cb[] area can be written to when BPF program is | |
716 | * invoked (otherwise cb[] save/restore is necessary). | |
db58ba45 | 717 | */ |
6aaae2b6 | 718 | static inline void bpf_compute_data_pointers(struct sk_buff *skb) |
db58ba45 AS |
719 | { |
720 | struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb; | |
721 | ||
c593642c | 722 | BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb)); |
de8f3a83 DB |
723 | cb->data_meta = skb->data - skb_metadata_len(skb); |
724 | cb->data_end = skb->data + skb_headlen(skb); | |
db58ba45 AS |
725 | } |
726 | ||
b39b5f41 SL |
727 | /* Similar to bpf_compute_data_pointers(), except that save orginal |
728 | * data in cb->data and cb->meta_data for restore. | |
729 | */ | |
730 | static inline void bpf_compute_and_save_data_end( | |
731 | struct sk_buff *skb, void **saved_data_end) | |
732 | { | |
733 | struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb; | |
734 | ||
735 | *saved_data_end = cb->data_end; | |
736 | cb->data_end = skb->data + skb_headlen(skb); | |
737 | } | |
738 | ||
9c8c3fa3 | 739 | /* Restore data saved by bpf_compute_and_save_data_end(). */ |
b39b5f41 SL |
740 | static inline void bpf_restore_data_end( |
741 | struct sk_buff *skb, void *saved_data_end) | |
742 | { | |
743 | struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb; | |
744 | ||
745 | cb->data_end = saved_data_end; | |
746 | } | |
747 | ||
7d08c2c9 | 748 | static inline u8 *bpf_skb_cb(const struct sk_buff *skb) |
01dd194c DB |
749 | { |
750 | /* eBPF programs may read/write skb->cb[] area to transfer meta | |
751 | * data between tail calls. Since this also needs to work with | |
752 | * tc, that scratch memory is mapped to qdisc_skb_cb's data area. | |
753 | * | |
754 | * In some socket filter cases, the cb unfortunately needs to be | |
755 | * saved/restored so that protocol specific skb->cb[] data won't | |
756 | * be lost. In any case, due to unpriviledged eBPF programs | |
757 | * attached to sockets, we need to clear the bpf_skb_cb() area | |
758 | * to not leak previous contents to user space. | |
759 | */ | |
c593642c PB |
760 | BUILD_BUG_ON(sizeof_field(struct __sk_buff, cb) != BPF_SKB_CB_LEN); |
761 | BUILD_BUG_ON(sizeof_field(struct __sk_buff, cb) != | |
762 | sizeof_field(struct qdisc_skb_cb, data)); | |
01dd194c DB |
763 | |
764 | return qdisc_skb_cb(skb)->data; | |
765 | } | |
766 | ||
2a916f2f | 767 | /* Must be invoked with migration disabled */ |
6cab5e90 | 768 | static inline u32 __bpf_prog_run_save_cb(const struct bpf_prog *prog, |
7d08c2c9 | 769 | const void *ctx) |
ff936a04 | 770 | { |
7d08c2c9 | 771 | const struct sk_buff *skb = ctx; |
01dd194c DB |
772 | u8 *cb_data = bpf_skb_cb(skb); |
773 | u8 cb_saved[BPF_SKB_CB_LEN]; | |
ff936a04 AS |
774 | u32 res; |
775 | ||
ff936a04 | 776 | if (unlikely(prog->cb_access)) { |
01dd194c DB |
777 | memcpy(cb_saved, cb_data, sizeof(cb_saved)); |
778 | memset(cb_data, 0, sizeof(cb_saved)); | |
ff936a04 AS |
779 | } |
780 | ||
fb7dd8bc | 781 | res = bpf_prog_run(prog, skb); |
ff936a04 AS |
782 | |
783 | if (unlikely(prog->cb_access)) | |
01dd194c | 784 | memcpy(cb_data, cb_saved, sizeof(cb_saved)); |
ff936a04 AS |
785 | |
786 | return res; | |
787 | } | |
788 | ||
6cab5e90 AS |
789 | static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog, |
790 | struct sk_buff *skb) | |
791 | { | |
792 | u32 res; | |
793 | ||
2a916f2f | 794 | migrate_disable(); |
6cab5e90 | 795 | res = __bpf_prog_run_save_cb(prog, skb); |
2a916f2f | 796 | migrate_enable(); |
6cab5e90 AS |
797 | return res; |
798 | } | |
799 | ||
ff936a04 AS |
800 | static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog, |
801 | struct sk_buff *skb) | |
802 | { | |
01dd194c | 803 | u8 *cb_data = bpf_skb_cb(skb); |
6cab5e90 | 804 | u32 res; |
ff936a04 AS |
805 | |
806 | if (unlikely(prog->cb_access)) | |
01dd194c DB |
807 | memset(cb_data, 0, BPF_SKB_CB_LEN); |
808 | ||
3d9f773c | 809 | res = bpf_prog_run_pin_on_cpu(prog, skb); |
6cab5e90 | 810 | return res; |
ff936a04 AS |
811 | } |
812 | ||
6a64037d | 813 | DECLARE_BPF_DISPATCHER(xdp) |
7e6897f9 | 814 | |
879af96f JM |
815 | DECLARE_STATIC_KEY_FALSE(bpf_master_redirect_enabled_key); |
816 | ||
817 | u32 xdp_master_redirect(struct xdp_buff *xdp); | |
818 | ||
7e6897f9 BT |
819 | void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog); |
820 | ||
aafe6ae9 DB |
821 | static inline u32 bpf_prog_insn_size(const struct bpf_prog *prog) |
822 | { | |
823 | return prog->len * sizeof(struct bpf_insn); | |
824 | } | |
825 | ||
f1f7714e | 826 | static inline u32 bpf_prog_tag_scratch_size(const struct bpf_prog *prog) |
aafe6ae9 DB |
827 | { |
828 | return round_up(bpf_prog_insn_size(prog) + | |
6b0b0fa2 | 829 | sizeof(__be64) + 1, SHA1_BLOCK_SIZE); |
aafe6ae9 DB |
830 | } |
831 | ||
7ae457c1 | 832 | static inline unsigned int bpf_prog_size(unsigned int proglen) |
b715631f | 833 | { |
7ae457c1 AS |
834 | return max(sizeof(struct bpf_prog), |
835 | offsetof(struct bpf_prog, insns[proglen])); | |
b715631f SH |
836 | } |
837 | ||
7b36f929 DB |
838 | static inline bool bpf_prog_was_classic(const struct bpf_prog *prog) |
839 | { | |
840 | /* When classic BPF programs have been loaded and the arch | |
841 | * does not have a classic BPF JIT (anymore), they have been | |
842 | * converted via bpf_migrate_filter() to eBPF and thus always | |
843 | * have an unspec program type. | |
844 | */ | |
845 | return prog->type == BPF_PROG_TYPE_UNSPEC; | |
846 | } | |
847 | ||
bc23105c DB |
848 | static inline u32 bpf_ctx_off_adjust_machine(u32 size) |
849 | { | |
850 | const u32 size_machine = sizeof(unsigned long); | |
851 | ||
852 | if (size > size_machine && size % size_machine == 0) | |
853 | size = size_machine; | |
854 | ||
855 | return size; | |
856 | } | |
857 | ||
bc23105c DB |
858 | static inline bool |
859 | bpf_ctx_narrow_access_ok(u32 off, u32 size, u32 size_default) | |
860 | { | |
46f53a65 | 861 | return size <= size_default && (size & (size - 1)) == 0; |
f96da094 DB |
862 | } |
863 | ||
d9b8aada | 864 | static inline u8 |
d895a0f1 | 865 | bpf_ctx_narrow_access_offset(u32 off, u32 size, u32 size_default) |
d9b8aada | 866 | { |
d895a0f1 | 867 | u8 access_off = off & (size_default - 1); |
d9b8aada IL |
868 | |
869 | #ifdef __LITTLE_ENDIAN | |
d895a0f1 | 870 | return access_off; |
d9b8aada | 871 | #else |
d895a0f1 | 872 | return size_default - (access_off + size); |
d9b8aada IL |
873 | #endif |
874 | } | |
875 | ||
b4399546 | 876 | #define bpf_ctx_wide_access_ok(off, size, type, field) \ |
600c70ba SF |
877 | (size == sizeof(__u64) && \ |
878 | off >= offsetof(type, field) && \ | |
879 | off + sizeof(__u64) <= offsetofend(type, field) && \ | |
880 | off % sizeof(__u64) == 0) | |
881 | ||
009937e7 | 882 | #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0])) |
a3ea269b | 883 | |
60a3b225 DB |
884 | static inline void bpf_prog_lock_ro(struct bpf_prog *fp) |
885 | { | |
e1608f3f DB |
886 | #ifndef CONFIG_BPF_JIT_ALWAYS_ON |
887 | if (!fp->jited) { | |
888 | set_vm_flush_reset_perms(fp); | |
889 | set_memory_ro((unsigned long)fp, fp->pages); | |
890 | } | |
891 | #endif | |
60a3b225 DB |
892 | } |
893 | ||
9d876e79 DB |
894 | static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr) |
895 | { | |
d53d2f78 | 896 | set_vm_flush_reset_perms(hdr); |
d48567c9 | 897 | set_memory_rox((unsigned long)hdr, hdr->size >> PAGE_SHIFT); |
9d876e79 DB |
898 | } |
899 | ||
f4979fce WB |
900 | int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap); |
901 | static inline int sk_filter(struct sock *sk, struct sk_buff *skb) | |
902 | { | |
903 | return sk_filter_trim_cap(sk, skb, 1); | |
904 | } | |
bd4cf0ed | 905 | |
d1c55ab5 | 906 | struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err); |
7ae457c1 | 907 | void bpf_prog_free(struct bpf_prog *fp); |
bd4cf0ed | 908 | |
5e581dad DB |
909 | bool bpf_opcode_in_insntable(u8 code); |
910 | ||
c454a46b MKL |
911 | void bpf_prog_fill_jited_linfo(struct bpf_prog *prog, |
912 | const u32 *insn_to_jit_off); | |
913 | int bpf_prog_alloc_jited_linfo(struct bpf_prog *prog); | |
e16301fb | 914 | void bpf_prog_jit_attempt_done(struct bpf_prog *prog); |
c454a46b | 915 | |
60a3b225 | 916 | struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags); |
492ecee8 | 917 | struct bpf_prog *bpf_prog_alloc_no_stats(unsigned int size, gfp_t gfp_extra_flags); |
60a3b225 DB |
918 | struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size, |
919 | gfp_t gfp_extra_flags); | |
920 | void __bpf_prog_free(struct bpf_prog *fp); | |
921 | ||
922 | static inline void bpf_prog_unlock_free(struct bpf_prog *fp) | |
923 | { | |
60a3b225 DB |
924 | __bpf_prog_free(fp); |
925 | } | |
926 | ||
ac67eb2c DB |
927 | typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter, |
928 | unsigned int flen); | |
929 | ||
7ae457c1 | 930 | int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog); |
ac67eb2c | 931 | int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, |
bab18991 | 932 | bpf_aux_classic_check_t trans, bool save_orig); |
7ae457c1 | 933 | void bpf_prog_destroy(struct bpf_prog *fp); |
a3ea269b | 934 | |
fbc907f0 | 935 | int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk); |
89aa0758 | 936 | int sk_attach_bpf(u32 ufd, struct sock *sk); |
538950a1 CG |
937 | int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk); |
938 | int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk); | |
8217ca65 | 939 | void sk_reuseport_prog_free(struct bpf_prog *prog); |
fbc907f0 | 940 | int sk_detach_filter(struct sock *sk); |
4ff09db1 | 941 | int sk_get_filter(struct sock *sk, sockptr_t optval, unsigned int len); |
fbc907f0 | 942 | |
278571ba | 943 | bool sk_filter_charge(struct sock *sk, struct sk_filter *fp); |
fbc907f0 | 944 | void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp); |
0a14842f | 945 | |
62258278 | 946 | u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); |
1ea47e01 AS |
947 | #define __bpf_call_base_args \ |
948 | ((u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)) \ | |
6943c2b0 | 949 | (void *)__bpf_call_base) |
d1c55ab5 DB |
950 | |
951 | struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog); | |
9383191d | 952 | void bpf_jit_compile(struct bpf_prog *prog); |
a4b1d3c1 | 953 | bool bpf_jit_needs_zext(void); |
95acd881 | 954 | bool bpf_jit_supports_subprog_tailcalls(void); |
e6ac2450 | 955 | bool bpf_jit_supports_kfunc_call(void); |
1cf3bfc6 | 956 | bool bpf_jit_supports_far_kfunc_call(void); |
fd5d27b7 KKD |
957 | bool bpf_jit_supports_exceptions(void); |
958 | void arch_bpf_stack_walk(bool (*consume_fn)(void *cookie, u64 ip, u64 sp, u64 bp), void *cookie); | |
17bedab2 | 959 | bool bpf_helper_changes_pkt_data(void *func); |
62258278 | 960 | |
63960260 | 961 | static inline bool bpf_dump_raw_ok(const struct cred *cred) |
7105e828 DB |
962 | { |
963 | /* Reconstruction of call-sites is dependent on kallsyms, | |
964 | * thus make dump the same restriction. | |
965 | */ | |
63960260 | 966 | return kallsyms_show_value(cred); |
7105e828 DB |
967 | } |
968 | ||
c237ee5e DB |
969 | struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off, |
970 | const struct bpf_insn *patch, u32 len); | |
52875a04 | 971 | int bpf_remove_insns(struct bpf_prog *prog, u32 off, u32 cnt); |
814abfab | 972 | |
f6069b9a DB |
973 | void bpf_clear_redirect_map(struct bpf_map *map); |
974 | ||
2539650f TM |
975 | static inline bool xdp_return_frame_no_direct(void) |
976 | { | |
977 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); | |
978 | ||
979 | return ri->kern_flags & BPF_RI_F_RF_NO_DIRECT; | |
980 | } | |
981 | ||
982 | static inline void xdp_set_return_frame_no_direct(void) | |
983 | { | |
984 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); | |
985 | ||
986 | ri->kern_flags |= BPF_RI_F_RF_NO_DIRECT; | |
987 | } | |
988 | ||
989 | static inline void xdp_clear_return_frame_no_direct(void) | |
990 | { | |
991 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); | |
992 | ||
993 | ri->kern_flags &= ~BPF_RI_F_RF_NO_DIRECT; | |
994 | } | |
995 | ||
d8d7218a TM |
996 | static inline int xdp_ok_fwd_dev(const struct net_device *fwd, |
997 | unsigned int pktlen) | |
6d5fc195 TM |
998 | { |
999 | unsigned int len; | |
1000 | ||
1001 | if (unlikely(!(fwd->flags & IFF_UP))) | |
1002 | return -ENETDOWN; | |
1003 | ||
1004 | len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN; | |
d8d7218a | 1005 | if (pktlen > len) |
6d5fc195 TM |
1006 | return -EMSGSIZE; |
1007 | ||
1008 | return 0; | |
1009 | } | |
1010 | ||
1d233886 | 1011 | /* The pair of xdp_do_redirect and xdp_do_flush MUST be called in the |
11393cc9 JF |
1012 | * same cpu context. Further for best results no more than a single map |
1013 | * for the do_redirect/do_flush pair should be used. This limitation is | |
1014 | * because we only track one map and force a flush when the map changes. | |
2ddf71e2 | 1015 | * This does not appear to be a real limitation for existing software. |
11393cc9 | 1016 | */ |
2facaad6 | 1017 | int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb, |
02671e23 | 1018 | struct xdp_buff *xdp, struct bpf_prog *prog); |
5acaee0a JF |
1019 | int xdp_do_redirect(struct net_device *dev, |
1020 | struct xdp_buff *xdp, | |
1021 | struct bpf_prog *prog); | |
1372d34c THJ |
1022 | int xdp_do_redirect_frame(struct net_device *dev, |
1023 | struct xdp_buff *xdp, | |
1024 | struct xdp_frame *xdpf, | |
1025 | struct bpf_prog *prog); | |
1d233886 THJ |
1026 | void xdp_do_flush(void); |
1027 | ||
c8064e5b | 1028 | void bpf_warn_invalid_xdp_action(struct net_device *dev, struct bpf_prog *prog, u32 act); |
c237ee5e | 1029 | |
2dbb9b9e MKL |
1030 | #ifdef CONFIG_INET |
1031 | struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk, | |
1032 | struct bpf_prog *prog, struct sk_buff *skb, | |
d5e4ddae | 1033 | struct sock *migrating_sk, |
2dbb9b9e MKL |
1034 | u32 hash); |
1035 | #else | |
1036 | static inline struct sock * | |
1037 | bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk, | |
1038 | struct bpf_prog *prog, struct sk_buff *skb, | |
d5e4ddae | 1039 | struct sock *migrating_sk, |
2dbb9b9e MKL |
1040 | u32 hash) |
1041 | { | |
1042 | return NULL; | |
1043 | } | |
1044 | #endif | |
1045 | ||
b954d834 | 1046 | #ifdef CONFIG_BPF_JIT |
c94987e4 | 1047 | extern int bpf_jit_enable; |
4f3446bb | 1048 | extern int bpf_jit_harden; |
74451e66 | 1049 | extern int bpf_jit_kallsyms; |
fdadd049 | 1050 | extern long bpf_jit_limit; |
fadb7ff1 | 1051 | extern long bpf_jit_limit_max; |
c94987e4 | 1052 | |
b954d834 DB |
1053 | typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size); |
1054 | ||
19c02415 SL |
1055 | void bpf_jit_fill_hole_with_zero(void *area, unsigned int size); |
1056 | ||
b954d834 DB |
1057 | struct bpf_binary_header * |
1058 | bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, | |
1059 | unsigned int alignment, | |
1060 | bpf_jit_fill_hole_t bpf_fill_ill_insns); | |
1061 | void bpf_jit_binary_free(struct bpf_binary_header *hdr); | |
116bfa96 VK |
1062 | u64 bpf_jit_alloc_exec_limit(void); |
1063 | void *bpf_jit_alloc_exec(unsigned long size); | |
1064 | void bpf_jit_free_exec(void *addr); | |
b954d834 | 1065 | void bpf_jit_free(struct bpf_prog *fp); |
1d5f82d9 SL |
1066 | struct bpf_binary_header * |
1067 | bpf_jit_binary_pack_hdr(const struct bpf_prog *fp); | |
1068 | ||
19c02415 | 1069 | void *bpf_prog_pack_alloc(u32 size, bpf_jit_fill_hole_t bpf_fill_ill_insns); |
f08a1c65 | 1070 | void bpf_prog_pack_free(void *ptr, u32 size); |
19c02415 | 1071 | |
1d5f82d9 SL |
1072 | static inline bool bpf_prog_kallsyms_verify_off(const struct bpf_prog *fp) |
1073 | { | |
1074 | return list_empty(&fp->aux->ksym.lnode) || | |
1075 | fp->aux->ksym.lnode.prev == LIST_POISON2; | |
1076 | } | |
b954d834 | 1077 | |
33c98058 SL |
1078 | struct bpf_binary_header * |
1079 | bpf_jit_binary_pack_alloc(unsigned int proglen, u8 **ro_image, | |
1080 | unsigned int alignment, | |
1081 | struct bpf_binary_header **rw_hdr, | |
1082 | u8 **rw_image, | |
1083 | bpf_jit_fill_hole_t bpf_fill_ill_insns); | |
1084 | int bpf_jit_binary_pack_finalize(struct bpf_prog *prog, | |
1085 | struct bpf_binary_header *ro_header, | |
1086 | struct bpf_binary_header *rw_header); | |
1087 | void bpf_jit_binary_pack_free(struct bpf_binary_header *ro_header, | |
1088 | struct bpf_binary_header *rw_header); | |
1089 | ||
a66886fe DB |
1090 | int bpf_jit_add_poke_descriptor(struct bpf_prog *prog, |
1091 | struct bpf_jit_poke_descriptor *poke); | |
1092 | ||
e2c95a61 DB |
1093 | int bpf_jit_get_func_addr(const struct bpf_prog *prog, |
1094 | const struct bpf_insn *insn, bool extra_pass, | |
1095 | u64 *func_addr, bool *func_addr_fixed); | |
1096 | ||
4f3446bb DB |
1097 | struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp); |
1098 | void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other); | |
1099 | ||
b954d834 DB |
1100 | static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen, |
1101 | u32 pass, void *image) | |
1102 | { | |
b13138ef DB |
1103 | pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen, |
1104 | proglen, pass, image, current->comm, task_pid_nr(current)); | |
1105 | ||
b954d834 DB |
1106 | if (image) |
1107 | print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET, | |
1108 | 16, 1, image, proglen, false); | |
1109 | } | |
4f3446bb DB |
1110 | |
1111 | static inline bool bpf_jit_is_ebpf(void) | |
1112 | { | |
1113 | # ifdef CONFIG_HAVE_EBPF_JIT | |
1114 | return true; | |
1115 | # else | |
1116 | return false; | |
1117 | # endif | |
1118 | } | |
1119 | ||
81ed18ab AS |
1120 | static inline bool ebpf_jit_enabled(void) |
1121 | { | |
1122 | return bpf_jit_enable && bpf_jit_is_ebpf(); | |
1123 | } | |
1124 | ||
74451e66 DB |
1125 | static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp) |
1126 | { | |
1127 | return fp->jited && bpf_jit_is_ebpf(); | |
1128 | } | |
1129 | ||
60b58afc | 1130 | static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog) |
4f3446bb DB |
1131 | { |
1132 | /* These are the prerequisites, should someone ever have the | |
1133 | * idea to call blinding outside of them, we make sure to | |
1134 | * bail out. | |
1135 | */ | |
1136 | if (!bpf_jit_is_ebpf()) | |
1137 | return false; | |
60b58afc | 1138 | if (!prog->jit_requested) |
4f3446bb DB |
1139 | return false; |
1140 | if (!bpf_jit_harden) | |
1141 | return false; | |
d17aff80 | 1142 | if (bpf_jit_harden == 1 && bpf_capable()) |
4f3446bb DB |
1143 | return false; |
1144 | ||
1145 | return true; | |
1146 | } | |
74451e66 DB |
1147 | |
1148 | static inline bool bpf_jit_kallsyms_enabled(void) | |
1149 | { | |
1150 | /* There are a couple of corner cases where kallsyms should | |
1151 | * not be enabled f.e. on hardening. | |
1152 | */ | |
1153 | if (bpf_jit_harden) | |
1154 | return false; | |
1155 | if (!bpf_jit_kallsyms) | |
1156 | return false; | |
1157 | if (bpf_jit_kallsyms == 1) | |
1158 | return true; | |
1159 | ||
1160 | return false; | |
1161 | } | |
1162 | ||
1163 | const char *__bpf_address_lookup(unsigned long addr, unsigned long *size, | |
1164 | unsigned long *off, char *sym); | |
1165 | bool is_bpf_text_address(unsigned long addr); | |
1166 | int bpf_get_kallsym(unsigned int symnum, unsigned long *value, char *type, | |
1167 | char *sym); | |
f18b03fa | 1168 | struct bpf_prog *bpf_prog_ksym_find(unsigned long addr); |
74451e66 DB |
1169 | |
1170 | static inline const char * | |
1171 | bpf_address_lookup(unsigned long addr, unsigned long *size, | |
1172 | unsigned long *off, char **modname, char *sym) | |
1173 | { | |
1174 | const char *ret = __bpf_address_lookup(addr, size, off, sym); | |
1175 | ||
1176 | if (ret && modname) | |
1177 | *modname = NULL; | |
1178 | return ret; | |
1179 | } | |
1180 | ||
1181 | void bpf_prog_kallsyms_add(struct bpf_prog *fp); | |
1182 | void bpf_prog_kallsyms_del(struct bpf_prog *fp); | |
1183 | ||
1184 | #else /* CONFIG_BPF_JIT */ | |
1185 | ||
81ed18ab AS |
1186 | static inline bool ebpf_jit_enabled(void) |
1187 | { | |
1188 | return false; | |
1189 | } | |
1190 | ||
b8cd76ca DB |
1191 | static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog) |
1192 | { | |
1193 | return false; | |
1194 | } | |
1195 | ||
74451e66 DB |
1196 | static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp) |
1197 | { | |
1198 | return false; | |
1199 | } | |
1200 | ||
a66886fe DB |
1201 | static inline int |
1202 | bpf_jit_add_poke_descriptor(struct bpf_prog *prog, | |
1203 | struct bpf_jit_poke_descriptor *poke) | |
1204 | { | |
1205 | return -ENOTSUPP; | |
1206 | } | |
1207 | ||
b954d834 DB |
1208 | static inline void bpf_jit_free(struct bpf_prog *fp) |
1209 | { | |
1210 | bpf_prog_unlock_free(fp); | |
1211 | } | |
74451e66 DB |
1212 | |
1213 | static inline bool bpf_jit_kallsyms_enabled(void) | |
1214 | { | |
1215 | return false; | |
1216 | } | |
1217 | ||
1218 | static inline const char * | |
1219 | __bpf_address_lookup(unsigned long addr, unsigned long *size, | |
1220 | unsigned long *off, char *sym) | |
1221 | { | |
1222 | return NULL; | |
1223 | } | |
1224 | ||
1225 | static inline bool is_bpf_text_address(unsigned long addr) | |
1226 | { | |
1227 | return false; | |
1228 | } | |
1229 | ||
1230 | static inline int bpf_get_kallsym(unsigned int symnum, unsigned long *value, | |
1231 | char *type, char *sym) | |
1232 | { | |
1233 | return -ERANGE; | |
1234 | } | |
1235 | ||
f18b03fa KKD |
1236 | static inline struct bpf_prog *bpf_prog_ksym_find(unsigned long addr) |
1237 | { | |
1238 | return NULL; | |
1239 | } | |
1240 | ||
74451e66 DB |
1241 | static inline const char * |
1242 | bpf_address_lookup(unsigned long addr, unsigned long *size, | |
1243 | unsigned long *off, char **modname, char *sym) | |
1244 | { | |
1245 | return NULL; | |
1246 | } | |
1247 | ||
1248 | static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp) | |
1249 | { | |
1250 | } | |
1251 | ||
1252 | static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp) | |
1253 | { | |
1254 | } | |
6ee52e2a | 1255 | |
b954d834 DB |
1256 | #endif /* CONFIG_BPF_JIT */ |
1257 | ||
7d1982b4 DB |
1258 | void bpf_prog_kallsyms_del_all(struct bpf_prog *fp); |
1259 | ||
34805931 DB |
1260 | #define BPF_ANC BIT(15) |
1261 | ||
55795ef5 RV |
1262 | static inline bool bpf_needs_clear_a(const struct sock_filter *first) |
1263 | { | |
1264 | switch (first->code) { | |
1265 | case BPF_RET | BPF_K: | |
1266 | case BPF_LD | BPF_W | BPF_LEN: | |
1267 | return false; | |
1268 | ||
1269 | case BPF_LD | BPF_W | BPF_ABS: | |
1270 | case BPF_LD | BPF_H | BPF_ABS: | |
1271 | case BPF_LD | BPF_B | BPF_ABS: | |
1272 | if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X) | |
1273 | return true; | |
1274 | return false; | |
1275 | ||
1276 | default: | |
1277 | return true; | |
1278 | } | |
1279 | } | |
1280 | ||
34805931 DB |
1281 | static inline u16 bpf_anc_helper(const struct sock_filter *ftest) |
1282 | { | |
1283 | BUG_ON(ftest->code & BPF_ANC); | |
1284 | ||
1285 | switch (ftest->code) { | |
1286 | case BPF_LD | BPF_W | BPF_ABS: | |
1287 | case BPF_LD | BPF_H | BPF_ABS: | |
1288 | case BPF_LD | BPF_B | BPF_ABS: | |
1289 | #define BPF_ANCILLARY(CODE) case SKF_AD_OFF + SKF_AD_##CODE: \ | |
1290 | return BPF_ANC | SKF_AD_##CODE | |
1291 | switch (ftest->k) { | |
1292 | BPF_ANCILLARY(PROTOCOL); | |
1293 | BPF_ANCILLARY(PKTTYPE); | |
1294 | BPF_ANCILLARY(IFINDEX); | |
1295 | BPF_ANCILLARY(NLATTR); | |
1296 | BPF_ANCILLARY(NLATTR_NEST); | |
1297 | BPF_ANCILLARY(MARK); | |
1298 | BPF_ANCILLARY(QUEUE); | |
1299 | BPF_ANCILLARY(HATYPE); | |
1300 | BPF_ANCILLARY(RXHASH); | |
1301 | BPF_ANCILLARY(CPU); | |
1302 | BPF_ANCILLARY(ALU_XOR_X); | |
1303 | BPF_ANCILLARY(VLAN_TAG); | |
1304 | BPF_ANCILLARY(VLAN_TAG_PRESENT); | |
1305 | BPF_ANCILLARY(PAY_OFFSET); | |
1306 | BPF_ANCILLARY(RANDOM); | |
27cd5452 | 1307 | BPF_ANCILLARY(VLAN_TPID); |
34805931 | 1308 | } |
df561f66 | 1309 | fallthrough; |
34805931 DB |
1310 | default: |
1311 | return ftest->code; | |
1312 | } | |
1313 | } | |
1314 | ||
9f12fbe6 ZSL |
1315 | void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb, |
1316 | int k, unsigned int size); | |
1317 | ||
ea02f941 MS |
1318 | static inline int bpf_tell_extensions(void) |
1319 | { | |
37692299 | 1320 | return SKF_AD_MAX; |
ea02f941 MS |
1321 | } |
1322 | ||
4fbac77d AI |
1323 | struct bpf_sock_addr_kern { |
1324 | struct sock *sk; | |
1325 | struct sockaddr *uaddr; | |
1326 | /* Temporary "register" to make indirect stores to nested structures | |
1327 | * defined above. We need three registers to make such a store, but | |
1328 | * only two (src and dst) are available at convert_ctx_access time | |
1329 | */ | |
1330 | u64 tmp_reg; | |
1cedee13 | 1331 | void *t_ctx; /* Attach type specific context. */ |
fefba7d1 | 1332 | u32 uaddrlen; |
4fbac77d AI |
1333 | }; |
1334 | ||
40304b2a LB |
1335 | struct bpf_sock_ops_kern { |
1336 | struct sock *sk; | |
40304b2a | 1337 | union { |
de525be2 | 1338 | u32 args[4]; |
40304b2a LB |
1339 | u32 reply; |
1340 | u32 replylong[4]; | |
1341 | }; | |
0813a841 MKL |
1342 | struct sk_buff *syn_skb; |
1343 | struct sk_buff *skb; | |
1344 | void *skb_data_end; | |
c9985d09 MKL |
1345 | u8 op; |
1346 | u8 is_fullsock; | |
0813a841 | 1347 | u8 remaining_opt_len; |
b73042b8 LB |
1348 | u64 temp; /* temp and everything after is not |
1349 | * initialized to 0 before calling | |
1350 | * the BPF program. New fields that | |
1351 | * should be initialized to 0 should | |
1352 | * be inserted before temp. | |
1353 | * temp is scratch storage used by | |
1354 | * sock_ops_convert_ctx_access | |
1355 | * as temporary storage of a register. | |
1356 | */ | |
40304b2a LB |
1357 | }; |
1358 | ||
7b146ceb AI |
1359 | struct bpf_sysctl_kern { |
1360 | struct ctl_table_header *head; | |
1361 | struct ctl_table *table; | |
1d11b301 AI |
1362 | void *cur_val; |
1363 | size_t cur_len; | |
4e63acdf AI |
1364 | void *new_val; |
1365 | size_t new_len; | |
1366 | int new_updated; | |
7b146ceb | 1367 | int write; |
e1550bfe AI |
1368 | loff_t *ppos; |
1369 | /* Temporary "register" for indirect stores to ppos. */ | |
1370 | u64 tmp_reg; | |
7b146ceb AI |
1371 | }; |
1372 | ||
20f2505f SF |
1373 | #define BPF_SOCKOPT_KERN_BUF_SIZE 32 |
1374 | struct bpf_sockopt_buf { | |
1375 | u8 data[BPF_SOCKOPT_KERN_BUF_SIZE]; | |
1376 | }; | |
1377 | ||
0d01da6a SF |
1378 | struct bpf_sockopt_kern { |
1379 | struct sock *sk; | |
1380 | u8 *optval; | |
1381 | u8 *optval_end; | |
1382 | s32 level; | |
1383 | s32 optname; | |
1384 | s32 optlen; | |
c4dcfdd4 YZ |
1385 | /* for retval in struct bpf_cg_run_ctx */ |
1386 | struct task_struct *current_task; | |
1387 | /* Temporary "register" for indirect stores to ppos. */ | |
1388 | u64 tmp_reg; | |
0d01da6a SF |
1389 | }; |
1390 | ||
b1ea9ff6 | 1391 | int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len); |
4d295e54 | 1392 | |
e9ddbb77 JS |
1393 | struct bpf_sk_lookup_kern { |
1394 | u16 family; | |
1395 | u16 protocol; | |
d66423fb LB |
1396 | __be16 sport; |
1397 | u16 dport; | |
e9ddbb77 JS |
1398 | struct { |
1399 | __be32 saddr; | |
1400 | __be32 daddr; | |
1401 | } v4; | |
1402 | struct { | |
1403 | const struct in6_addr *saddr; | |
1404 | const struct in6_addr *daddr; | |
1405 | } v6; | |
e9ddbb77 | 1406 | struct sock *selected_sk; |
f8931565 | 1407 | u32 ingress_ifindex; |
e9ddbb77 JS |
1408 | bool no_reuseport; |
1409 | }; | |
1410 | ||
1559b4aa JS |
1411 | extern struct static_key_false bpf_sk_lookup_enabled; |
1412 | ||
1413 | /* Runners for BPF_SK_LOOKUP programs to invoke on socket lookup. | |
1414 | * | |
1415 | * Allowed return values for a BPF SK_LOOKUP program are SK_PASS and | |
1416 | * SK_DROP. Their meaning is as follows: | |
1417 | * | |
1418 | * SK_PASS && ctx.selected_sk != NULL: use selected_sk as lookup result | |
1419 | * SK_PASS && ctx.selected_sk == NULL: continue to htable-based socket lookup | |
1420 | * SK_DROP : terminate lookup with -ECONNREFUSED | |
1421 | * | |
1422 | * This macro aggregates return values and selected sockets from | |
1423 | * multiple BPF programs according to following rules in order: | |
1424 | * | |
1425 | * 1. If any program returned SK_PASS and a non-NULL ctx.selected_sk, | |
1426 | * macro result is SK_PASS and last ctx.selected_sk is used. | |
1427 | * 2. If any program returned SK_DROP return value, | |
1428 | * macro result is SK_DROP. | |
1429 | * 3. Otherwise result is SK_PASS and ctx.selected_sk is NULL. | |
1430 | * | |
1431 | * Caller must ensure that the prog array is non-NULL, and that the | |
1432 | * array as well as the programs it contains remain valid. | |
1433 | */ | |
1434 | #define BPF_PROG_SK_LOOKUP_RUN_ARRAY(array, ctx, func) \ | |
1435 | ({ \ | |
1436 | struct bpf_sk_lookup_kern *_ctx = &(ctx); \ | |
1437 | struct bpf_prog_array_item *_item; \ | |
1438 | struct sock *_selected_sk = NULL; \ | |
1439 | bool _no_reuseport = false; \ | |
1440 | struct bpf_prog *_prog; \ | |
1441 | bool _all_pass = true; \ | |
1442 | u32 _ret; \ | |
1443 | \ | |
1444 | migrate_disable(); \ | |
1445 | _item = &(array)->items[0]; \ | |
1446 | while ((_prog = READ_ONCE(_item->prog))) { \ | |
1447 | /* restore most recent selection */ \ | |
1448 | _ctx->selected_sk = _selected_sk; \ | |
1449 | _ctx->no_reuseport = _no_reuseport; \ | |
1450 | \ | |
1451 | _ret = func(_prog, _ctx); \ | |
1452 | if (_ret == SK_PASS && _ctx->selected_sk) { \ | |
1453 | /* remember last non-NULL socket */ \ | |
1454 | _selected_sk = _ctx->selected_sk; \ | |
1455 | _no_reuseport = _ctx->no_reuseport; \ | |
1456 | } else if (_ret == SK_DROP && _all_pass) { \ | |
1457 | _all_pass = false; \ | |
1458 | } \ | |
1459 | _item++; \ | |
1460 | } \ | |
1461 | _ctx->selected_sk = _selected_sk; \ | |
1462 | _ctx->no_reuseport = _no_reuseport; \ | |
1463 | migrate_enable(); \ | |
1464 | _all_pass || _selected_sk ? SK_PASS : SK_DROP; \ | |
1465 | }) | |
1466 | ||
1467 | static inline bool bpf_sk_lookup_run_v4(struct net *net, int protocol, | |
1468 | const __be32 saddr, const __be16 sport, | |
1469 | const __be32 daddr, const u16 dport, | |
f8931565 | 1470 | const int ifindex, struct sock **psk) |
1559b4aa JS |
1471 | { |
1472 | struct bpf_prog_array *run_array; | |
1473 | struct sock *selected_sk = NULL; | |
1474 | bool no_reuseport = false; | |
1475 | ||
1476 | rcu_read_lock(); | |
1477 | run_array = rcu_dereference(net->bpf.run_array[NETNS_BPF_SK_LOOKUP]); | |
1478 | if (run_array) { | |
1479 | struct bpf_sk_lookup_kern ctx = { | |
1480 | .family = AF_INET, | |
1481 | .protocol = protocol, | |
1482 | .v4.saddr = saddr, | |
1483 | .v4.daddr = daddr, | |
1484 | .sport = sport, | |
1485 | .dport = dport, | |
f8931565 | 1486 | .ingress_ifindex = ifindex, |
1559b4aa JS |
1487 | }; |
1488 | u32 act; | |
1489 | ||
fb7dd8bc | 1490 | act = BPF_PROG_SK_LOOKUP_RUN_ARRAY(run_array, ctx, bpf_prog_run); |
1559b4aa JS |
1491 | if (act == SK_PASS) { |
1492 | selected_sk = ctx.selected_sk; | |
1493 | no_reuseport = ctx.no_reuseport; | |
1494 | } else { | |
1495 | selected_sk = ERR_PTR(-ECONNREFUSED); | |
1496 | } | |
1497 | } | |
1498 | rcu_read_unlock(); | |
1499 | *psk = selected_sk; | |
1500 | return no_reuseport; | |
1501 | } | |
1502 | ||
1122702f JS |
1503 | #if IS_ENABLED(CONFIG_IPV6) |
1504 | static inline bool bpf_sk_lookup_run_v6(struct net *net, int protocol, | |
1505 | const struct in6_addr *saddr, | |
1506 | const __be16 sport, | |
1507 | const struct in6_addr *daddr, | |
1508 | const u16 dport, | |
f8931565 | 1509 | const int ifindex, struct sock **psk) |
1122702f JS |
1510 | { |
1511 | struct bpf_prog_array *run_array; | |
1512 | struct sock *selected_sk = NULL; | |
1513 | bool no_reuseport = false; | |
1514 | ||
1515 | rcu_read_lock(); | |
1516 | run_array = rcu_dereference(net->bpf.run_array[NETNS_BPF_SK_LOOKUP]); | |
1517 | if (run_array) { | |
1518 | struct bpf_sk_lookup_kern ctx = { | |
1519 | .family = AF_INET6, | |
1520 | .protocol = protocol, | |
1521 | .v6.saddr = saddr, | |
1522 | .v6.daddr = daddr, | |
1523 | .sport = sport, | |
1524 | .dport = dport, | |
f8931565 | 1525 | .ingress_ifindex = ifindex, |
1122702f JS |
1526 | }; |
1527 | u32 act; | |
1528 | ||
fb7dd8bc | 1529 | act = BPF_PROG_SK_LOOKUP_RUN_ARRAY(run_array, ctx, bpf_prog_run); |
1122702f JS |
1530 | if (act == SK_PASS) { |
1531 | selected_sk = ctx.selected_sk; | |
1532 | no_reuseport = ctx.no_reuseport; | |
1533 | } else { | |
1534 | selected_sk = ERR_PTR(-ECONNREFUSED); | |
1535 | } | |
1536 | } | |
1537 | rcu_read_unlock(); | |
1538 | *psk = selected_sk; | |
1539 | return no_reuseport; | |
1540 | } | |
1541 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
1542 | ||
d7ba4cc9 JK |
1543 | static __always_inline long __bpf_xdp_redirect_map(struct bpf_map *map, u64 index, |
1544 | u64 flags, const u64 flag_mask, | |
1545 | void *lookup_elem(struct bpf_map *map, u32 key)) | |
e6a4750f BT |
1546 | { |
1547 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); | |
e624d4ed | 1548 | const u64 action_mask = XDP_ABORTED | XDP_DROP | XDP_PASS | XDP_TX; |
e6a4750f BT |
1549 | |
1550 | /* Lower bits of the flags are used as return code on lookup failure */ | |
e624d4ed | 1551 | if (unlikely(flags & ~(action_mask | flag_mask))) |
e6a4750f BT |
1552 | return XDP_ABORTED; |
1553 | ||
32637e33 | 1554 | ri->tgt_value = lookup_elem(map, index); |
e624d4ed | 1555 | if (unlikely(!ri->tgt_value) && !(flags & BPF_F_BROADCAST)) { |
e6a4750f BT |
1556 | /* If the lookup fails we want to clear out the state in the |
1557 | * redirect_info struct completely, so that if an eBPF program | |
1558 | * performs multiple lookups, the last one always takes | |
1559 | * precedence. | |
1560 | */ | |
ee75aef2 BT |
1561 | ri->map_id = INT_MAX; /* Valid map id idr range: [1,INT_MAX[ */ |
1562 | ri->map_type = BPF_MAP_TYPE_UNSPEC; | |
e624d4ed | 1563 | return flags & action_mask; |
e6a4750f BT |
1564 | } |
1565 | ||
32637e33 | 1566 | ri->tgt_index = index; |
ee75aef2 BT |
1567 | ri->map_id = map->id; |
1568 | ri->map_type = map->map_type; | |
e6a4750f | 1569 | |
e624d4ed HL |
1570 | if (flags & BPF_F_BROADCAST) { |
1571 | WRITE_ONCE(ri->map, map); | |
1572 | ri->flags = flags; | |
1573 | } else { | |
1574 | WRITE_ONCE(ri->map, NULL); | |
1575 | ri->flags = 0; | |
1576 | } | |
1577 | ||
e6a4750f BT |
1578 | return XDP_REDIRECT; |
1579 | } | |
1580 | ||
b5964b96 JK |
1581 | #ifdef CONFIG_NET |
1582 | int __bpf_skb_load_bytes(const struct sk_buff *skb, u32 offset, void *to, u32 len); | |
1583 | int __bpf_skb_store_bytes(struct sk_buff *skb, u32 offset, const void *from, | |
1584 | u32 len, u64 flags); | |
05421aec JK |
1585 | int __bpf_xdp_load_bytes(struct xdp_buff *xdp, u32 offset, void *buf, u32 len); |
1586 | int __bpf_xdp_store_bytes(struct xdp_buff *xdp, u32 offset, void *buf, u32 len); | |
66e3a13e JK |
1587 | void *bpf_xdp_pointer(struct xdp_buff *xdp, u32 offset, u32 len); |
1588 | void bpf_xdp_copy_buf(struct xdp_buff *xdp, unsigned long off, | |
1589 | void *buf, unsigned long len, bool flush); | |
b5964b96 JK |
1590 | #else /* CONFIG_NET */ |
1591 | static inline int __bpf_skb_load_bytes(const struct sk_buff *skb, u32 offset, | |
1592 | void *to, u32 len) | |
1593 | { | |
1594 | return -EOPNOTSUPP; | |
1595 | } | |
1596 | ||
1597 | static inline int __bpf_skb_store_bytes(struct sk_buff *skb, u32 offset, | |
1598 | const void *from, u32 len, u64 flags) | |
1599 | { | |
1600 | return -EOPNOTSUPP; | |
1601 | } | |
05421aec JK |
1602 | |
1603 | static inline int __bpf_xdp_load_bytes(struct xdp_buff *xdp, u32 offset, | |
1604 | void *buf, u32 len) | |
1605 | { | |
1606 | return -EOPNOTSUPP; | |
1607 | } | |
1608 | ||
1609 | static inline int __bpf_xdp_store_bytes(struct xdp_buff *xdp, u32 offset, | |
1610 | void *buf, u32 len) | |
1611 | { | |
1612 | return -EOPNOTSUPP; | |
1613 | } | |
66e3a13e JK |
1614 | |
1615 | static inline void *bpf_xdp_pointer(struct xdp_buff *xdp, u32 offset, u32 len) | |
1616 | { | |
1617 | return NULL; | |
1618 | } | |
1619 | ||
8a60a041 KFL |
1620 | static inline void bpf_xdp_copy_buf(struct xdp_buff *xdp, unsigned long off, void *buf, |
1621 | unsigned long len, bool flush) | |
66e3a13e | 1622 | { |
66e3a13e | 1623 | } |
b5964b96 JK |
1624 | #endif /* CONFIG_NET */ |
1625 | ||
1da177e4 | 1626 | #endif /* __LINUX_FILTER_H__ */ |