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daedfb22 AS |
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> | |
c15952dc | 11 | #include <linux/bpf_common.h> |
daedfb22 AS |
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 | ||
b2197755 | 66 | /* BPF syscall commands, see bpf(2) man-page for details. */ |
99c55f7d | 67 | enum bpf_cmd { |
99c55f7d | 68 | BPF_MAP_CREATE, |
db20fd2b | 69 | BPF_MAP_LOOKUP_ELEM, |
db20fd2b | 70 | BPF_MAP_UPDATE_ELEM, |
db20fd2b | 71 | BPF_MAP_DELETE_ELEM, |
db20fd2b | 72 | BPF_MAP_GET_NEXT_KEY, |
09756af4 | 73 | BPF_PROG_LOAD, |
b2197755 DB |
74 | BPF_OBJ_PIN, |
75 | BPF_OBJ_GET, | |
99c55f7d AS |
76 | }; |
77 | ||
78 | enum bpf_map_type { | |
79 | BPF_MAP_TYPE_UNSPEC, | |
0f8e4bd8 | 80 | BPF_MAP_TYPE_HASH, |
28fbcfa0 | 81 | BPF_MAP_TYPE_ARRAY, |
04fd61ab | 82 | BPF_MAP_TYPE_PROG_ARRAY, |
ea317b26 | 83 | BPF_MAP_TYPE_PERF_EVENT_ARRAY, |
824bd0ce | 84 | BPF_MAP_TYPE_PERCPU_HASH, |
99c55f7d AS |
85 | }; |
86 | ||
09756af4 AS |
87 | enum bpf_prog_type { |
88 | BPF_PROG_TYPE_UNSPEC, | |
ddd872bc | 89 | BPF_PROG_TYPE_SOCKET_FILTER, |
2541517c | 90 | BPF_PROG_TYPE_KPROBE, |
96be4325 | 91 | BPF_PROG_TYPE_SCHED_CLS, |
94caee8c | 92 | BPF_PROG_TYPE_SCHED_ACT, |
09756af4 AS |
93 | }; |
94 | ||
f1a66f85 DB |
95 | #define BPF_PSEUDO_MAP_FD 1 |
96 | ||
3274f520 AS |
97 | /* flags for BPF_MAP_UPDATE_ELEM command */ |
98 | #define BPF_ANY 0 /* create new element or update existing */ | |
99 | #define BPF_NOEXIST 1 /* create new element if it didn't exist */ | |
100 | #define BPF_EXIST 2 /* update existing element */ | |
101 | ||
99c55f7d AS |
102 | union bpf_attr { |
103 | struct { /* anonymous struct used by BPF_MAP_CREATE command */ | |
104 | __u32 map_type; /* one of enum bpf_map_type */ | |
105 | __u32 key_size; /* size of key in bytes */ | |
106 | __u32 value_size; /* size of value in bytes */ | |
107 | __u32 max_entries; /* max number of entries in a map */ | |
108 | }; | |
db20fd2b AS |
109 | |
110 | struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */ | |
111 | __u32 map_fd; | |
112 | __aligned_u64 key; | |
113 | union { | |
114 | __aligned_u64 value; | |
115 | __aligned_u64 next_key; | |
116 | }; | |
3274f520 | 117 | __u64 flags; |
db20fd2b | 118 | }; |
09756af4 AS |
119 | |
120 | struct { /* anonymous struct used by BPF_PROG_LOAD command */ | |
121 | __u32 prog_type; /* one of enum bpf_prog_type */ | |
122 | __u32 insn_cnt; | |
123 | __aligned_u64 insns; | |
124 | __aligned_u64 license; | |
cbd35700 AS |
125 | __u32 log_level; /* verbosity level of verifier */ |
126 | __u32 log_size; /* size of user buffer */ | |
127 | __aligned_u64 log_buf; /* user supplied buffer */ | |
2541517c | 128 | __u32 kern_version; /* checked when prog_type=kprobe */ |
09756af4 | 129 | }; |
b2197755 DB |
130 | |
131 | struct { /* anonymous struct used by BPF_OBJ_* commands */ | |
132 | __aligned_u64 pathname; | |
133 | __u32 bpf_fd; | |
134 | }; | |
99c55f7d AS |
135 | } __attribute__((aligned(8))); |
136 | ||
09756af4 AS |
137 | /* integer value in 'imm' field of BPF_CALL instruction selects which helper |
138 | * function eBPF program intends to call | |
139 | */ | |
140 | enum bpf_func_id { | |
141 | BPF_FUNC_unspec, | |
d0003ec0 AS |
142 | BPF_FUNC_map_lookup_elem, /* void *map_lookup_elem(&map, &key) */ |
143 | BPF_FUNC_map_update_elem, /* int map_update_elem(&map, &key, &value, flags) */ | |
144 | BPF_FUNC_map_delete_elem, /* int map_delete_elem(&map, &key) */ | |
2541517c | 145 | BPF_FUNC_probe_read, /* int bpf_probe_read(void *dst, int size, void *src) */ |
d9847d31 | 146 | BPF_FUNC_ktime_get_ns, /* u64 bpf_ktime_get_ns(void) */ |
9c959c86 | 147 | BPF_FUNC_trace_printk, /* int bpf_trace_printk(const char *fmt, int fmt_size, ...) */ |
03e69b50 | 148 | BPF_FUNC_get_prandom_u32, /* u32 prandom_u32(void) */ |
c04167ce | 149 | BPF_FUNC_get_smp_processor_id, /* u32 raw_smp_processor_id(void) */ |
91bc4822 AS |
150 | |
151 | /** | |
152 | * skb_store_bytes(skb, offset, from, len, flags) - store bytes into packet | |
153 | * @skb: pointer to skb | |
a166151c | 154 | * @offset: offset within packet from skb->mac_header |
91bc4822 AS |
155 | * @from: pointer where to copy bytes from |
156 | * @len: number of bytes to store into packet | |
157 | * @flags: bit 0 - if true, recompute skb->csum | |
158 | * other bits - reserved | |
159 | * Return: 0 on success | |
160 | */ | |
161 | BPF_FUNC_skb_store_bytes, | |
162 | ||
163 | /** | |
164 | * l3_csum_replace(skb, offset, from, to, flags) - recompute IP checksum | |
165 | * @skb: pointer to skb | |
166 | * @offset: offset within packet where IP checksum is located | |
167 | * @from: old value of header field | |
168 | * @to: new value of header field | |
169 | * @flags: bits 0-3 - size of header field | |
170 | * other bits - reserved | |
171 | * Return: 0 on success | |
172 | */ | |
173 | BPF_FUNC_l3_csum_replace, | |
174 | ||
175 | /** | |
176 | * l4_csum_replace(skb, offset, from, to, flags) - recompute TCP/UDP checksum | |
177 | * @skb: pointer to skb | |
178 | * @offset: offset within packet where TCP/UDP checksum is located | |
179 | * @from: old value of header field | |
180 | * @to: new value of header field | |
181 | * @flags: bits 0-3 - size of header field | |
182 | * bit 4 - is pseudo header | |
183 | * other bits - reserved | |
184 | * Return: 0 on success | |
185 | */ | |
186 | BPF_FUNC_l4_csum_replace, | |
04fd61ab AS |
187 | |
188 | /** | |
189 | * bpf_tail_call(ctx, prog_array_map, index) - jump into another BPF program | |
190 | * @ctx: context pointer passed to next program | |
191 | * @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY | |
192 | * @index: index inside array that selects specific program to run | |
193 | * Return: 0 on success | |
194 | */ | |
195 | BPF_FUNC_tail_call, | |
3896d655 AS |
196 | |
197 | /** | |
198 | * bpf_clone_redirect(skb, ifindex, flags) - redirect to another netdev | |
199 | * @skb: pointer to skb | |
200 | * @ifindex: ifindex of the net device | |
201 | * @flags: bit 0 - if set, redirect to ingress instead of egress | |
202 | * other bits - reserved | |
203 | * Return: 0 on success | |
204 | */ | |
205 | BPF_FUNC_clone_redirect, | |
ffeedafb AS |
206 | |
207 | /** | |
208 | * u64 bpf_get_current_pid_tgid(void) | |
209 | * Return: current->tgid << 32 | current->pid | |
210 | */ | |
211 | BPF_FUNC_get_current_pid_tgid, | |
212 | ||
213 | /** | |
214 | * u64 bpf_get_current_uid_gid(void) | |
215 | * Return: current_gid << 32 | current_uid | |
216 | */ | |
217 | BPF_FUNC_get_current_uid_gid, | |
218 | ||
219 | /** | |
220 | * bpf_get_current_comm(char *buf, int size_of_buf) | |
221 | * stores current->comm into buf | |
222 | * Return: 0 on success | |
223 | */ | |
224 | BPF_FUNC_get_current_comm, | |
8d20aabe DB |
225 | |
226 | /** | |
227 | * bpf_get_cgroup_classid(skb) - retrieve a proc's classid | |
228 | * @skb: pointer to skb | |
229 | * Return: classid if != 0 | |
230 | */ | |
231 | BPF_FUNC_get_cgroup_classid, | |
4e10df9a AS |
232 | BPF_FUNC_skb_vlan_push, /* bpf_skb_vlan_push(skb, vlan_proto, vlan_tci) */ |
233 | BPF_FUNC_skb_vlan_pop, /* bpf_skb_vlan_pop(skb) */ | |
d3aa45ce AS |
234 | |
235 | /** | |
236 | * bpf_skb_[gs]et_tunnel_key(skb, key, size, flags) | |
237 | * retrieve or populate tunnel metadata | |
238 | * @skb: pointer to skb | |
239 | * @key: pointer to 'struct bpf_tunnel_key' | |
240 | * @size: size of 'struct bpf_tunnel_key' | |
241 | * @flags: room for future extensions | |
242 | * Retrun: 0 on success | |
243 | */ | |
244 | BPF_FUNC_skb_get_tunnel_key, | |
245 | BPF_FUNC_skb_set_tunnel_key, | |
35578d79 | 246 | BPF_FUNC_perf_event_read, /* u64 bpf_perf_event_read(&map, index) */ |
27b29f63 AS |
247 | /** |
248 | * bpf_redirect(ifindex, flags) - redirect to another netdev | |
249 | * @ifindex: ifindex of the net device | |
250 | * @flags: bit 0 - if set, redirect to ingress instead of egress | |
251 | * other bits - reserved | |
252 | * Return: TC_ACT_REDIRECT | |
253 | */ | |
254 | BPF_FUNC_redirect, | |
c46646d0 DB |
255 | |
256 | /** | |
257 | * bpf_get_route_realm(skb) - retrieve a dst's tclassid | |
258 | * @skb: pointer to skb | |
259 | * Return: realm if != 0 | |
260 | */ | |
261 | BPF_FUNC_get_route_realm, | |
a43eec30 AS |
262 | |
263 | /** | |
264 | * bpf_perf_event_output(ctx, map, index, data, size) - output perf raw sample | |
265 | * @ctx: struct pt_regs* | |
266 | * @map: pointer to perf_event_array map | |
267 | * @index: index of event in the map | |
268 | * @data: data on stack to be output as raw data | |
269 | * @size: size of data | |
270 | * Return: 0 on success | |
271 | */ | |
272 | BPF_FUNC_perf_event_output, | |
05c74e5e | 273 | BPF_FUNC_skb_load_bytes, |
09756af4 AS |
274 | __BPF_FUNC_MAX_ID, |
275 | }; | |
276 | ||
781c53bc DB |
277 | /* All flags used by eBPF helper functions, placed here. */ |
278 | ||
279 | /* BPF_FUNC_skb_store_bytes flags. */ | |
280 | #define BPF_F_RECOMPUTE_CSUM (1ULL << 0) | |
281 | ||
282 | /* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags. | |
283 | * First 4 bits are for passing the header field size. | |
284 | */ | |
285 | #define BPF_F_HDR_FIELD_MASK 0xfULL | |
286 | ||
287 | /* BPF_FUNC_l4_csum_replace flags. */ | |
288 | #define BPF_F_PSEUDO_HDR (1ULL << 4) | |
289 | ||
290 | /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */ | |
291 | #define BPF_F_INGRESS (1ULL << 0) | |
292 | ||
c6c33454 DB |
293 | /* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */ |
294 | #define BPF_F_TUNINFO_IPV6 (1ULL << 0) | |
295 | ||
9bac3d6d AS |
296 | /* user accessible mirror of in-kernel sk_buff. |
297 | * new fields can only be added to the end of this structure | |
298 | */ | |
299 | struct __sk_buff { | |
300 | __u32 len; | |
301 | __u32 pkt_type; | |
302 | __u32 mark; | |
303 | __u32 queue_mapping; | |
c2497395 AS |
304 | __u32 protocol; |
305 | __u32 vlan_present; | |
306 | __u32 vlan_tci; | |
27cd5452 | 307 | __u32 vlan_proto; |
bcad5718 | 308 | __u32 priority; |
37e82c2f AS |
309 | __u32 ingress_ifindex; |
310 | __u32 ifindex; | |
d691f9e8 AS |
311 | __u32 tc_index; |
312 | __u32 cb[5]; | |
ba7591d8 | 313 | __u32 hash; |
045efa82 | 314 | __u32 tc_classid; |
9bac3d6d AS |
315 | }; |
316 | ||
d3aa45ce AS |
317 | struct bpf_tunnel_key { |
318 | __u32 tunnel_id; | |
c6c33454 DB |
319 | union { |
320 | __u32 remote_ipv4; | |
321 | __u32 remote_ipv6[4]; | |
322 | }; | |
323 | __u8 tunnel_tos; | |
324 | __u8 tunnel_ttl; | |
d3aa45ce AS |
325 | }; |
326 | ||
daedfb22 | 327 | #endif /* _UAPI__LINUX_BPF_H__ */ |