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971e827b ACM |
1 | /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com |
2 | * | |
3 | * This program is free software; you can redistribute it and/or | |
4 | * modify it under the terms of version 2 of the GNU General Public | |
5 | * License as published by the Free Software Foundation. | |
6 | */ | |
7 | #ifndef _UAPI__LINUX_BPF_H__ | |
8 | #define _UAPI__LINUX_BPF_H__ | |
9 | ||
10 | #include <linux/types.h> | |
11 | #include <linux/bpf_common.h> | |
12 | ||
13 | /* Extended instruction set based on top of classic BPF */ | |
14 | ||
15 | /* instruction classes */ | |
16 | #define BPF_ALU64 0x07 /* alu mode in double word width */ | |
17 | ||
18 | /* ld/ldx fields */ | |
19 | #define BPF_DW 0x18 /* double word */ | |
20 | #define BPF_XADD 0xc0 /* exclusive add */ | |
21 | ||
22 | /* alu/jmp fields */ | |
23 | #define BPF_MOV 0xb0 /* mov reg to reg */ | |
24 | #define BPF_ARSH 0xc0 /* sign extending arithmetic shift right */ | |
25 | ||
26 | /* change endianness of a register */ | |
27 | #define BPF_END 0xd0 /* flags for endianness conversion: */ | |
28 | #define BPF_TO_LE 0x00 /* convert to little-endian */ | |
29 | #define BPF_TO_BE 0x08 /* convert to big-endian */ | |
30 | #define BPF_FROM_LE BPF_TO_LE | |
31 | #define BPF_FROM_BE BPF_TO_BE | |
32 | ||
33 | #define BPF_JNE 0x50 /* jump != */ | |
34 | #define BPF_JSGT 0x60 /* SGT is signed '>', GT in x86 */ | |
35 | #define BPF_JSGE 0x70 /* SGE is signed '>=', GE in x86 */ | |
36 | #define BPF_CALL 0x80 /* function call */ | |
37 | #define BPF_EXIT 0x90 /* function return */ | |
38 | ||
39 | /* Register numbers */ | |
40 | enum { | |
41 | BPF_REG_0 = 0, | |
42 | BPF_REG_1, | |
43 | BPF_REG_2, | |
44 | BPF_REG_3, | |
45 | BPF_REG_4, | |
46 | BPF_REG_5, | |
47 | BPF_REG_6, | |
48 | BPF_REG_7, | |
49 | BPF_REG_8, | |
50 | BPF_REG_9, | |
51 | BPF_REG_10, | |
52 | __MAX_BPF_REG, | |
53 | }; | |
54 | ||
55 | /* BPF has 10 general purpose 64-bit registers and stack frame. */ | |
56 | #define MAX_BPF_REG __MAX_BPF_REG | |
57 | ||
58 | struct bpf_insn { | |
59 | __u8 code; /* opcode */ | |
60 | __u8 dst_reg:4; /* dest register */ | |
61 | __u8 src_reg:4; /* source register */ | |
62 | __s16 off; /* signed offset */ | |
63 | __s32 imm; /* signed immediate constant */ | |
64 | }; | |
65 | ||
9a738266 MS |
66 | /* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */ |
67 | struct bpf_lpm_trie_key { | |
68 | __u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */ | |
69 | __u8 data[0]; /* Arbitrary size */ | |
70 | }; | |
71 | ||
971e827b ACM |
72 | /* BPF syscall commands, see bpf(2) man-page for details. */ |
73 | enum bpf_cmd { | |
74 | BPF_MAP_CREATE, | |
75 | BPF_MAP_LOOKUP_ELEM, | |
76 | BPF_MAP_UPDATE_ELEM, | |
77 | BPF_MAP_DELETE_ELEM, | |
78 | BPF_MAP_GET_NEXT_KEY, | |
79 | BPF_PROG_LOAD, | |
80 | BPF_OBJ_PIN, | |
81 | BPF_OBJ_GET, | |
0cb34dc2 JS |
82 | BPF_PROG_ATTACH, |
83 | BPF_PROG_DETACH, | |
30848873 | 84 | BPF_PROG_TEST_RUN, |
95b9afd3 MKL |
85 | BPF_PROG_GET_NEXT_ID, |
86 | BPF_MAP_GET_NEXT_ID, | |
87 | BPF_PROG_GET_FD_BY_ID, | |
88 | BPF_MAP_GET_FD_BY_ID, | |
89 | BPF_OBJ_GET_INFO_BY_FD, | |
971e827b ACM |
90 | }; |
91 | ||
92 | enum bpf_map_type { | |
93 | BPF_MAP_TYPE_UNSPEC, | |
94 | BPF_MAP_TYPE_HASH, | |
95 | BPF_MAP_TYPE_ARRAY, | |
96 | BPF_MAP_TYPE_PROG_ARRAY, | |
97 | BPF_MAP_TYPE_PERF_EVENT_ARRAY, | |
98 | BPF_MAP_TYPE_PERCPU_HASH, | |
99 | BPF_MAP_TYPE_PERCPU_ARRAY, | |
100 | BPF_MAP_TYPE_STACK_TRACE, | |
791cceb8 | 101 | BPF_MAP_TYPE_CGROUP_ARRAY, |
0cb34dc2 JS |
102 | BPF_MAP_TYPE_LRU_HASH, |
103 | BPF_MAP_TYPE_LRU_PERCPU_HASH, | |
9a738266 | 104 | BPF_MAP_TYPE_LPM_TRIE, |
fb30d4b7 MKL |
105 | BPF_MAP_TYPE_ARRAY_OF_MAPS, |
106 | BPF_MAP_TYPE_HASH_OF_MAPS, | |
971e827b ACM |
107 | }; |
108 | ||
109 | enum bpf_prog_type { | |
110 | BPF_PROG_TYPE_UNSPEC, | |
111 | BPF_PROG_TYPE_SOCKET_FILTER, | |
112 | BPF_PROG_TYPE_KPROBE, | |
113 | BPF_PROG_TYPE_SCHED_CLS, | |
114 | BPF_PROG_TYPE_SCHED_ACT, | |
115 | BPF_PROG_TYPE_TRACEPOINT, | |
791cceb8 | 116 | BPF_PROG_TYPE_XDP, |
0cb34dc2 JS |
117 | BPF_PROG_TYPE_PERF_EVENT, |
118 | BPF_PROG_TYPE_CGROUP_SKB, | |
119 | BPF_PROG_TYPE_CGROUP_SOCK, | |
120 | BPF_PROG_TYPE_LWT_IN, | |
121 | BPF_PROG_TYPE_LWT_OUT, | |
122 | BPF_PROG_TYPE_LWT_XMIT, | |
971e827b ACM |
123 | }; |
124 | ||
0cb34dc2 JS |
125 | enum bpf_attach_type { |
126 | BPF_CGROUP_INET_INGRESS, | |
127 | BPF_CGROUP_INET_EGRESS, | |
128 | BPF_CGROUP_INET_SOCK_CREATE, | |
129 | __MAX_BPF_ATTACH_TYPE | |
130 | }; | |
131 | ||
132 | #define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE | |
133 | ||
5463b3d0 SR |
134 | /* If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command |
135 | * to the given target_fd cgroup the descendent cgroup will be able to | |
136 | * override effective bpf program that was inherited from this cgroup | |
137 | */ | |
138 | #define BPF_F_ALLOW_OVERRIDE (1U << 0) | |
139 | ||
e07b98d9 DM |
140 | /* If BPF_F_STRICT_ALIGNMENT is used in BPF_PROG_LOAD command, the |
141 | * verifier will perform strict alignment checking as if the kernel | |
142 | * has been built with CONFIG_EFFICIENT_UNALIGNED_ACCESS not set, | |
143 | * and NET_IP_ALIGN defined to 2. | |
144 | */ | |
145 | #define BPF_F_STRICT_ALIGNMENT (1U << 0) | |
146 | ||
971e827b ACM |
147 | #define BPF_PSEUDO_MAP_FD 1 |
148 | ||
149 | /* flags for BPF_MAP_UPDATE_ELEM command */ | |
150 | #define BPF_ANY 0 /* create new element or update existing */ | |
151 | #define BPF_NOEXIST 1 /* create new element if it didn't exist */ | |
152 | #define BPF_EXIST 2 /* update existing element */ | |
153 | ||
154 | #define BPF_F_NO_PREALLOC (1U << 0) | |
0cb34dc2 JS |
155 | /* Instead of having one common LRU list in the |
156 | * BPF_MAP_TYPE_LRU_[PERCPU_]HASH map, use a percpu LRU list | |
157 | * which can scale and perform better. | |
158 | * Note, the LRU nodes (including free nodes) cannot be moved | |
159 | * across different LRU lists. | |
160 | */ | |
161 | #define BPF_F_NO_COMMON_LRU (1U << 1) | |
971e827b ACM |
162 | |
163 | union bpf_attr { | |
164 | struct { /* anonymous struct used by BPF_MAP_CREATE command */ | |
165 | __u32 map_type; /* one of enum bpf_map_type */ | |
166 | __u32 key_size; /* size of key in bytes */ | |
167 | __u32 value_size; /* size of value in bytes */ | |
168 | __u32 max_entries; /* max number of entries in a map */ | |
169 | __u32 map_flags; /* prealloc or not */ | |
fb30d4b7 | 170 | __u32 inner_map_fd; /* fd pointing to the inner map */ |
971e827b ACM |
171 | }; |
172 | ||
173 | struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */ | |
174 | __u32 map_fd; | |
175 | __aligned_u64 key; | |
176 | union { | |
177 | __aligned_u64 value; | |
178 | __aligned_u64 next_key; | |
179 | }; | |
180 | __u64 flags; | |
181 | }; | |
182 | ||
183 | struct { /* anonymous struct used by BPF_PROG_LOAD command */ | |
184 | __u32 prog_type; /* one of enum bpf_prog_type */ | |
185 | __u32 insn_cnt; | |
186 | __aligned_u64 insns; | |
187 | __aligned_u64 license; | |
188 | __u32 log_level; /* verbosity level of verifier */ | |
189 | __u32 log_size; /* size of user buffer */ | |
190 | __aligned_u64 log_buf; /* user supplied buffer */ | |
191 | __u32 kern_version; /* checked when prog_type=kprobe */ | |
e07b98d9 | 192 | __u32 prog_flags; |
971e827b ACM |
193 | }; |
194 | ||
195 | struct { /* anonymous struct used by BPF_OBJ_* commands */ | |
196 | __aligned_u64 pathname; | |
197 | __u32 bpf_fd; | |
198 | }; | |
0cb34dc2 JS |
199 | |
200 | struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */ | |
201 | __u32 target_fd; /* container object to attach to */ | |
202 | __u32 attach_bpf_fd; /* eBPF program to attach */ | |
203 | __u32 attach_type; | |
5463b3d0 | 204 | __u32 attach_flags; |
0cb34dc2 | 205 | }; |
30848873 AS |
206 | |
207 | struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */ | |
208 | __u32 prog_fd; | |
209 | __u32 retval; | |
210 | __u32 data_size_in; | |
211 | __u32 data_size_out; | |
212 | __aligned_u64 data_in; | |
213 | __aligned_u64 data_out; | |
214 | __u32 repeat; | |
215 | __u32 duration; | |
216 | } test; | |
95b9afd3 MKL |
217 | |
218 | struct { /* anonymous struct used by BPF_*_GET_*_ID */ | |
219 | union { | |
220 | __u32 start_id; | |
221 | __u32 prog_id; | |
222 | __u32 map_id; | |
223 | }; | |
224 | __u32 next_id; | |
225 | }; | |
226 | ||
227 | struct { /* anonymous struct used by BPF_OBJ_GET_INFO_BY_FD */ | |
228 | __u32 bpf_fd; | |
229 | __u32 info_len; | |
230 | __aligned_u64 info; | |
231 | } info; | |
971e827b ACM |
232 | } __attribute__((aligned(8))); |
233 | ||
0cb34dc2 JS |
234 | /* BPF helper function descriptions: |
235 | * | |
236 | * void *bpf_map_lookup_elem(&map, &key) | |
237 | * Return: Map value or NULL | |
238 | * | |
239 | * int bpf_map_update_elem(&map, &key, &value, flags) | |
240 | * Return: 0 on success or negative error | |
241 | * | |
242 | * int bpf_map_delete_elem(&map, &key) | |
243 | * Return: 0 on success or negative error | |
244 | * | |
245 | * int bpf_probe_read(void *dst, int size, void *src) | |
246 | * Return: 0 on success or negative error | |
247 | * | |
248 | * u64 bpf_ktime_get_ns(void) | |
249 | * Return: current ktime | |
250 | * | |
251 | * int bpf_trace_printk(const char *fmt, int fmt_size, ...) | |
252 | * Return: length of buffer written or negative error | |
253 | * | |
254 | * u32 bpf_prandom_u32(void) | |
255 | * Return: random value | |
256 | * | |
257 | * u32 bpf_raw_smp_processor_id(void) | |
258 | * Return: SMP processor ID | |
259 | * | |
260 | * int bpf_skb_store_bytes(skb, offset, from, len, flags) | |
261 | * store bytes into packet | |
262 | * @skb: pointer to skb | |
263 | * @offset: offset within packet from skb->mac_header | |
264 | * @from: pointer where to copy bytes from | |
265 | * @len: number of bytes to store into packet | |
266 | * @flags: bit 0 - if true, recompute skb->csum | |
267 | * other bits - reserved | |
268 | * Return: 0 on success or negative error | |
269 | * | |
270 | * int bpf_l3_csum_replace(skb, offset, from, to, flags) | |
271 | * recompute IP checksum | |
272 | * @skb: pointer to skb | |
273 | * @offset: offset within packet where IP checksum is located | |
274 | * @from: old value of header field | |
275 | * @to: new value of header field | |
276 | * @flags: bits 0-3 - size of header field | |
277 | * other bits - reserved | |
278 | * Return: 0 on success or negative error | |
279 | * | |
280 | * int bpf_l4_csum_replace(skb, offset, from, to, flags) | |
281 | * recompute TCP/UDP checksum | |
282 | * @skb: pointer to skb | |
283 | * @offset: offset within packet where TCP/UDP checksum is located | |
284 | * @from: old value of header field | |
285 | * @to: new value of header field | |
286 | * @flags: bits 0-3 - size of header field | |
287 | * bit 4 - is pseudo header | |
288 | * other bits - reserved | |
289 | * Return: 0 on success or negative error | |
290 | * | |
291 | * int bpf_tail_call(ctx, prog_array_map, index) | |
292 | * jump into another BPF program | |
293 | * @ctx: context pointer passed to next program | |
294 | * @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY | |
295 | * @index: index inside array that selects specific program to run | |
296 | * Return: 0 on success or negative error | |
297 | * | |
298 | * int bpf_clone_redirect(skb, ifindex, flags) | |
299 | * redirect to another netdev | |
300 | * @skb: pointer to skb | |
301 | * @ifindex: ifindex of the net device | |
302 | * @flags: bit 0 - if set, redirect to ingress instead of egress | |
303 | * other bits - reserved | |
304 | * Return: 0 on success or negative error | |
305 | * | |
306 | * u64 bpf_get_current_pid_tgid(void) | |
307 | * Return: current->tgid << 32 | current->pid | |
308 | * | |
309 | * u64 bpf_get_current_uid_gid(void) | |
310 | * Return: current_gid << 32 | current_uid | |
311 | * | |
312 | * int bpf_get_current_comm(char *buf, int size_of_buf) | |
313 | * stores current->comm into buf | |
314 | * Return: 0 on success or negative error | |
315 | * | |
316 | * u32 bpf_get_cgroup_classid(skb) | |
317 | * retrieve a proc's classid | |
318 | * @skb: pointer to skb | |
319 | * Return: classid if != 0 | |
320 | * | |
321 | * int bpf_skb_vlan_push(skb, vlan_proto, vlan_tci) | |
322 | * Return: 0 on success or negative error | |
323 | * | |
324 | * int bpf_skb_vlan_pop(skb) | |
325 | * Return: 0 on success or negative error | |
326 | * | |
327 | * int bpf_skb_get_tunnel_key(skb, key, size, flags) | |
328 | * int bpf_skb_set_tunnel_key(skb, key, size, flags) | |
329 | * retrieve or populate tunnel metadata | |
330 | * @skb: pointer to skb | |
331 | * @key: pointer to 'struct bpf_tunnel_key' | |
332 | * @size: size of 'struct bpf_tunnel_key' | |
333 | * @flags: room for future extensions | |
334 | * Return: 0 on success or negative error | |
335 | * | |
b7d3ed5b TQ |
336 | * u64 bpf_perf_event_read(map, flags) |
337 | * read perf event counter value | |
338 | * @map: pointer to perf_event_array map | |
339 | * @flags: index of event in the map or bitmask flags | |
340 | * Return: value of perf event counter read or error code | |
0cb34dc2 JS |
341 | * |
342 | * int bpf_redirect(ifindex, flags) | |
343 | * redirect to another netdev | |
344 | * @ifindex: ifindex of the net device | |
345 | * @flags: bit 0 - if set, redirect to ingress instead of egress | |
346 | * other bits - reserved | |
347 | * Return: TC_ACT_REDIRECT | |
348 | * | |
349 | * u32 bpf_get_route_realm(skb) | |
350 | * retrieve a dst's tclassid | |
351 | * @skb: pointer to skb | |
352 | * Return: realm if != 0 | |
353 | * | |
b7d3ed5b | 354 | * int bpf_perf_event_output(ctx, map, flags, data, size) |
0cb34dc2 JS |
355 | * output perf raw sample |
356 | * @ctx: struct pt_regs* | |
357 | * @map: pointer to perf_event_array map | |
b7d3ed5b | 358 | * @flags: index of event in the map or bitmask flags |
0cb34dc2 JS |
359 | * @data: data on stack to be output as raw data |
360 | * @size: size of data | |
361 | * Return: 0 on success or negative error | |
362 | * | |
363 | * int bpf_get_stackid(ctx, map, flags) | |
364 | * walk user or kernel stack and return id | |
365 | * @ctx: struct pt_regs* | |
366 | * @map: pointer to stack_trace map | |
367 | * @flags: bits 0-7 - numer of stack frames to skip | |
368 | * bit 8 - collect user stack instead of kernel | |
369 | * bit 9 - compare stacks by hash only | |
370 | * bit 10 - if two different stacks hash into the same stackid | |
371 | * discard old | |
372 | * other bits - reserved | |
373 | * Return: >= 0 stackid on success or negative error | |
374 | * | |
375 | * s64 bpf_csum_diff(from, from_size, to, to_size, seed) | |
376 | * calculate csum diff | |
377 | * @from: raw from buffer | |
378 | * @from_size: length of from buffer | |
379 | * @to: raw to buffer | |
380 | * @to_size: length of to buffer | |
381 | * @seed: optional seed | |
382 | * Return: csum result or negative error code | |
383 | * | |
384 | * int bpf_skb_get_tunnel_opt(skb, opt, size) | |
385 | * retrieve tunnel options metadata | |
386 | * @skb: pointer to skb | |
387 | * @opt: pointer to raw tunnel option data | |
388 | * @size: size of @opt | |
389 | * Return: option size | |
390 | * | |
391 | * int bpf_skb_set_tunnel_opt(skb, opt, size) | |
392 | * populate tunnel options metadata | |
393 | * @skb: pointer to skb | |
394 | * @opt: pointer to raw tunnel option data | |
395 | * @size: size of @opt | |
396 | * Return: 0 on success or negative error | |
397 | * | |
398 | * int bpf_skb_change_proto(skb, proto, flags) | |
399 | * Change protocol of the skb. Currently supported is v4 -> v6, | |
400 | * v6 -> v4 transitions. The helper will also resize the skb. eBPF | |
401 | * program is expected to fill the new headers via skb_store_bytes | |
402 | * and lX_csum_replace. | |
403 | * @skb: pointer to skb | |
404 | * @proto: new skb->protocol type | |
405 | * @flags: reserved | |
406 | * Return: 0 on success or negative error | |
407 | * | |
408 | * int bpf_skb_change_type(skb, type) | |
409 | * Change packet type of skb. | |
410 | * @skb: pointer to skb | |
411 | * @type: new skb->pkt_type type | |
412 | * Return: 0 on success or negative error | |
413 | * | |
414 | * int bpf_skb_under_cgroup(skb, map, index) | |
415 | * Check cgroup2 membership of skb | |
416 | * @skb: pointer to skb | |
417 | * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type | |
418 | * @index: index of the cgroup in the bpf_map | |
419 | * Return: | |
420 | * == 0 skb failed the cgroup2 descendant test | |
421 | * == 1 skb succeeded the cgroup2 descendant test | |
422 | * < 0 error | |
423 | * | |
424 | * u32 bpf_get_hash_recalc(skb) | |
425 | * Retrieve and possibly recalculate skb->hash. | |
426 | * @skb: pointer to skb | |
427 | * Return: hash | |
428 | * | |
429 | * u64 bpf_get_current_task(void) | |
430 | * Returns current task_struct | |
431 | * Return: current | |
432 | * | |
433 | * int bpf_probe_write_user(void *dst, void *src, int len) | |
434 | * safely attempt to write to a location | |
435 | * @dst: destination address in userspace | |
436 | * @src: source address on stack | |
437 | * @len: number of bytes to copy | |
438 | * Return: 0 on success or negative error | |
439 | * | |
440 | * int bpf_current_task_under_cgroup(map, index) | |
441 | * Check cgroup2 membership of current task | |
442 | * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type | |
443 | * @index: index of the cgroup in the bpf_map | |
444 | * Return: | |
445 | * == 0 current failed the cgroup2 descendant test | |
446 | * == 1 current succeeded the cgroup2 descendant test | |
447 | * < 0 error | |
448 | * | |
449 | * int bpf_skb_change_tail(skb, len, flags) | |
450 | * The helper will resize the skb to the given new size, to be used f.e. | |
451 | * with control messages. | |
452 | * @skb: pointer to skb | |
453 | * @len: new skb length | |
454 | * @flags: reserved | |
455 | * Return: 0 on success or negative error | |
456 | * | |
457 | * int bpf_skb_pull_data(skb, len) | |
458 | * The helper will pull in non-linear data in case the skb is non-linear | |
459 | * and not all of len are part of the linear section. Only needed for | |
460 | * read/write with direct packet access. | |
461 | * @skb: pointer to skb | |
462 | * @len: len to make read/writeable | |
463 | * Return: 0 on success or negative error | |
464 | * | |
465 | * s64 bpf_csum_update(skb, csum) | |
466 | * Adds csum into skb->csum in case of CHECKSUM_COMPLETE. | |
467 | * @skb: pointer to skb | |
468 | * @csum: csum to add | |
469 | * Return: csum on success or negative error | |
470 | * | |
471 | * void bpf_set_hash_invalid(skb) | |
472 | * Invalidate current skb->hash. | |
473 | * @skb: pointer to skb | |
474 | * | |
475 | * int bpf_get_numa_node_id() | |
476 | * Return: Id of current NUMA node. | |
477 | * | |
478 | * int bpf_skb_change_head() | |
479 | * Grows headroom of skb and adjusts MAC header offset accordingly. | |
480 | * Will extends/reallocae as required automatically. | |
481 | * May change skb data pointer and will thus invalidate any check | |
482 | * performed for direct packet access. | |
483 | * @skb: pointer to skb | |
484 | * @len: length of header to be pushed in front | |
485 | * @flags: Flags (unused for now) | |
486 | * Return: 0 on success or negative error | |
487 | * | |
488 | * int bpf_xdp_adjust_head(xdp_md, delta) | |
489 | * Adjust the xdp_md.data by delta | |
490 | * @xdp_md: pointer to xdp_md | |
491 | * @delta: An positive/negative integer to be added to xdp_md.data | |
492 | * Return: 0 on success or negative on error | |
9a738266 MS |
493 | * |
494 | * int bpf_probe_read_str(void *dst, int size, const void *unsafe_ptr) | |
495 | * Copy a NUL terminated string from unsafe address. In case the string | |
496 | * length is smaller than size, the target is not padded with further NUL | |
497 | * bytes. In case the string length is larger than size, just count-1 | |
498 | * bytes are copied and the last byte is set to NUL. | |
499 | * @dst: destination address | |
500 | * @size: maximum number of bytes to copy, including the trailing NUL | |
501 | * @unsafe_ptr: unsafe address | |
502 | * Return: | |
503 | * > 0 length of the string including the trailing NUL on success | |
504 | * < 0 error | |
30848873 | 505 | * |
3c60a531 | 506 | * u64 bpf_get_socket_cookie(skb) |
30848873 AS |
507 | * Get the cookie for the socket stored inside sk_buff. |
508 | * @skb: pointer to skb | |
509 | * Return: 8 Bytes non-decreasing number on success or 0 if the socket | |
510 | * field is missing inside sk_buff | |
511 | * | |
512 | * u32 bpf_get_socket_uid(skb) | |
513 | * Get the owner uid of the socket stored inside sk_buff. | |
514 | * @skb: pointer to skb | |
e07b98d9 | 515 | * Return: uid of the socket owner on success or overflowuid if failed. |
0cb34dc2 JS |
516 | */ |
517 | #define __BPF_FUNC_MAPPER(FN) \ | |
518 | FN(unspec), \ | |
519 | FN(map_lookup_elem), \ | |
520 | FN(map_update_elem), \ | |
521 | FN(map_delete_elem), \ | |
522 | FN(probe_read), \ | |
523 | FN(ktime_get_ns), \ | |
524 | FN(trace_printk), \ | |
525 | FN(get_prandom_u32), \ | |
526 | FN(get_smp_processor_id), \ | |
527 | FN(skb_store_bytes), \ | |
528 | FN(l3_csum_replace), \ | |
529 | FN(l4_csum_replace), \ | |
530 | FN(tail_call), \ | |
531 | FN(clone_redirect), \ | |
532 | FN(get_current_pid_tgid), \ | |
533 | FN(get_current_uid_gid), \ | |
534 | FN(get_current_comm), \ | |
535 | FN(get_cgroup_classid), \ | |
536 | FN(skb_vlan_push), \ | |
537 | FN(skb_vlan_pop), \ | |
538 | FN(skb_get_tunnel_key), \ | |
539 | FN(skb_set_tunnel_key), \ | |
540 | FN(perf_event_read), \ | |
541 | FN(redirect), \ | |
542 | FN(get_route_realm), \ | |
543 | FN(perf_event_output), \ | |
544 | FN(skb_load_bytes), \ | |
545 | FN(get_stackid), \ | |
546 | FN(csum_diff), \ | |
547 | FN(skb_get_tunnel_opt), \ | |
548 | FN(skb_set_tunnel_opt), \ | |
549 | FN(skb_change_proto), \ | |
550 | FN(skb_change_type), \ | |
551 | FN(skb_under_cgroup), \ | |
552 | FN(get_hash_recalc), \ | |
553 | FN(get_current_task), \ | |
554 | FN(probe_write_user), \ | |
555 | FN(current_task_under_cgroup), \ | |
556 | FN(skb_change_tail), \ | |
557 | FN(skb_pull_data), \ | |
558 | FN(csum_update), \ | |
559 | FN(set_hash_invalid), \ | |
560 | FN(get_numa_node_id), \ | |
561 | FN(skb_change_head), \ | |
9a738266 | 562 | FN(xdp_adjust_head), \ |
91b8270f | 563 | FN(probe_read_str), \ |
6acc5c29 CF |
564 | FN(get_socket_cookie), \ |
565 | FN(get_socket_uid), | |
0cb34dc2 | 566 | |
971e827b ACM |
567 | /* integer value in 'imm' field of BPF_CALL instruction selects which helper |
568 | * function eBPF program intends to call | |
569 | */ | |
0cb34dc2 | 570 | #define __BPF_ENUM_FN(x) BPF_FUNC_ ## x |
971e827b | 571 | enum bpf_func_id { |
0cb34dc2 | 572 | __BPF_FUNC_MAPPER(__BPF_ENUM_FN) |
971e827b ACM |
573 | __BPF_FUNC_MAX_ID, |
574 | }; | |
0cb34dc2 | 575 | #undef __BPF_ENUM_FN |
971e827b ACM |
576 | |
577 | /* All flags used by eBPF helper functions, placed here. */ | |
578 | ||
579 | /* BPF_FUNC_skb_store_bytes flags. */ | |
580 | #define BPF_F_RECOMPUTE_CSUM (1ULL << 0) | |
581 | #define BPF_F_INVALIDATE_HASH (1ULL << 1) | |
582 | ||
583 | /* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags. | |
584 | * First 4 bits are for passing the header field size. | |
585 | */ | |
586 | #define BPF_F_HDR_FIELD_MASK 0xfULL | |
587 | ||
588 | /* BPF_FUNC_l4_csum_replace flags. */ | |
589 | #define BPF_F_PSEUDO_HDR (1ULL << 4) | |
590 | #define BPF_F_MARK_MANGLED_0 (1ULL << 5) | |
9a738266 | 591 | #define BPF_F_MARK_ENFORCE (1ULL << 6) |
971e827b ACM |
592 | |
593 | /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */ | |
594 | #define BPF_F_INGRESS (1ULL << 0) | |
595 | ||
596 | /* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */ | |
597 | #define BPF_F_TUNINFO_IPV6 (1ULL << 0) | |
598 | ||
599 | /* BPF_FUNC_get_stackid flags. */ | |
600 | #define BPF_F_SKIP_FIELD_MASK 0xffULL | |
601 | #define BPF_F_USER_STACK (1ULL << 8) | |
602 | #define BPF_F_FAST_STACK_CMP (1ULL << 9) | |
603 | #define BPF_F_REUSE_STACKID (1ULL << 10) | |
604 | ||
605 | /* BPF_FUNC_skb_set_tunnel_key flags. */ | |
606 | #define BPF_F_ZERO_CSUM_TX (1ULL << 1) | |
607 | #define BPF_F_DONT_FRAGMENT (1ULL << 2) | |
608 | ||
791cceb8 | 609 | /* BPF_FUNC_perf_event_output and BPF_FUNC_perf_event_read flags. */ |
971e827b ACM |
610 | #define BPF_F_INDEX_MASK 0xffffffffULL |
611 | #define BPF_F_CURRENT_CPU BPF_F_INDEX_MASK | |
791cceb8 ACM |
612 | /* BPF_FUNC_perf_event_output for sk_buff input context. */ |
613 | #define BPF_F_CTXLEN_MASK (0xfffffULL << 32) | |
971e827b ACM |
614 | |
615 | /* user accessible mirror of in-kernel sk_buff. | |
616 | * new fields can only be added to the end of this structure | |
617 | */ | |
618 | struct __sk_buff { | |
619 | __u32 len; | |
620 | __u32 pkt_type; | |
621 | __u32 mark; | |
622 | __u32 queue_mapping; | |
623 | __u32 protocol; | |
624 | __u32 vlan_present; | |
625 | __u32 vlan_tci; | |
626 | __u32 vlan_proto; | |
627 | __u32 priority; | |
628 | __u32 ingress_ifindex; | |
629 | __u32 ifindex; | |
630 | __u32 tc_index; | |
631 | __u32 cb[5]; | |
632 | __u32 hash; | |
633 | __u32 tc_classid; | |
634 | __u32 data; | |
635 | __u32 data_end; | |
b1d9fc41 | 636 | __u32 napi_id; |
971e827b ACM |
637 | }; |
638 | ||
639 | struct bpf_tunnel_key { | |
640 | __u32 tunnel_id; | |
641 | union { | |
642 | __u32 remote_ipv4; | |
643 | __u32 remote_ipv6[4]; | |
644 | }; | |
645 | __u8 tunnel_tos; | |
646 | __u8 tunnel_ttl; | |
647 | __u16 tunnel_ext; | |
648 | __u32 tunnel_label; | |
649 | }; | |
650 | ||
0cb34dc2 JS |
651 | /* Generic BPF return codes which all BPF program types may support. |
652 | * The values are binary compatible with their TC_ACT_* counter-part to | |
653 | * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT | |
654 | * programs. | |
655 | * | |
656 | * XDP is handled seprately, see XDP_*. | |
657 | */ | |
658 | enum bpf_ret_code { | |
659 | BPF_OK = 0, | |
660 | /* 1 reserved */ | |
661 | BPF_DROP = 2, | |
662 | /* 3-6 reserved */ | |
663 | BPF_REDIRECT = 7, | |
664 | /* >127 are reserved for prog type specific return codes */ | |
665 | }; | |
666 | ||
667 | struct bpf_sock { | |
668 | __u32 bound_dev_if; | |
669 | __u32 family; | |
670 | __u32 type; | |
671 | __u32 protocol; | |
672 | }; | |
673 | ||
674 | #define XDP_PACKET_HEADROOM 256 | |
675 | ||
791cceb8 ACM |
676 | /* User return codes for XDP prog type. |
677 | * A valid XDP program must return one of these defined values. All other | |
678 | * return codes are reserved for future use. Unknown return codes will result | |
679 | * in packet drop. | |
680 | */ | |
681 | enum xdp_action { | |
682 | XDP_ABORTED = 0, | |
683 | XDP_DROP, | |
684 | XDP_PASS, | |
685 | XDP_TX, | |
686 | }; | |
687 | ||
688 | /* user accessible metadata for XDP packet hook | |
689 | * new fields must be added to the end of this structure | |
690 | */ | |
691 | struct xdp_md { | |
692 | __u32 data; | |
693 | __u32 data_end; | |
694 | }; | |
695 | ||
95b9afd3 MKL |
696 | #define BPF_TAG_SIZE 8 |
697 | ||
698 | struct bpf_prog_info { | |
699 | __u32 type; | |
700 | __u32 id; | |
701 | __u8 tag[BPF_TAG_SIZE]; | |
702 | __u32 jited_prog_len; | |
703 | __u32 xlated_prog_len; | |
704 | __aligned_u64 jited_prog_insns; | |
705 | __aligned_u64 xlated_prog_insns; | |
706 | } __attribute__((aligned(8))); | |
707 | ||
708 | struct bpf_map_info { | |
709 | __u32 type; | |
710 | __u32 id; | |
711 | __u32 key_size; | |
712 | __u32 value_size; | |
713 | __u32 max_entries; | |
714 | __u32 map_flags; | |
715 | } __attribute__((aligned(8))); | |
716 | ||
971e827b | 717 | #endif /* _UAPI__LINUX_BPF_H__ */ |