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99c55f7d 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 _LINUX_BPF_H | |
8 | #define _LINUX_BPF_H 1 | |
9 | ||
10 | #include <uapi/linux/bpf.h> | |
11 | #include <linux/workqueue.h> | |
db20fd2b | 12 | #include <linux/file.h> |
b121d1e7 | 13 | #include <linux/percpu.h> |
99c55f7d AS |
14 | |
15 | struct bpf_map; | |
16 | ||
17 | /* map is generic key/value storage optionally accesible by eBPF programs */ | |
18 | struct bpf_map_ops { | |
19 | /* funcs callable from userspace (via syscall) */ | |
20 | struct bpf_map *(*map_alloc)(union bpf_attr *attr); | |
21 | void (*map_free)(struct bpf_map *); | |
db20fd2b AS |
22 | int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key); |
23 | ||
24 | /* funcs callable from userspace and from eBPF programs */ | |
25 | void *(*map_lookup_elem)(struct bpf_map *map, void *key); | |
3274f520 | 26 | int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags); |
db20fd2b | 27 | int (*map_delete_elem)(struct bpf_map *map, void *key); |
2a36f0b9 WN |
28 | |
29 | /* funcs called by prog_array and perf_event_array map */ | |
30 | void *(*map_fd_get_ptr) (struct bpf_map *map, int fd); | |
31 | void (*map_fd_put_ptr) (void *ptr); | |
99c55f7d AS |
32 | }; |
33 | ||
34 | struct bpf_map { | |
35 | atomic_t refcnt; | |
36 | enum bpf_map_type map_type; | |
37 | u32 key_size; | |
38 | u32 value_size; | |
39 | u32 max_entries; | |
aaac3ba9 AS |
40 | u32 pages; |
41 | struct user_struct *user; | |
a2c83fff | 42 | const struct bpf_map_ops *ops; |
99c55f7d | 43 | struct work_struct work; |
c9da161c | 44 | atomic_t usercnt; |
99c55f7d AS |
45 | }; |
46 | ||
47 | struct bpf_map_type_list { | |
48 | struct list_head list_node; | |
a2c83fff | 49 | const struct bpf_map_ops *ops; |
99c55f7d AS |
50 | enum bpf_map_type type; |
51 | }; | |
52 | ||
17a52670 AS |
53 | /* function argument constraints */ |
54 | enum bpf_arg_type { | |
80f1d68c | 55 | ARG_DONTCARE = 0, /* unused argument in helper function */ |
17a52670 AS |
56 | |
57 | /* the following constraints used to prototype | |
58 | * bpf_map_lookup/update/delete_elem() functions | |
59 | */ | |
60 | ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ | |
61 | ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ | |
62 | ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ | |
63 | ||
64 | /* the following constraints used to prototype bpf_memcmp() and other | |
65 | * functions that access data on eBPF program stack | |
66 | */ | |
67 | ARG_PTR_TO_STACK, /* any pointer to eBPF program stack */ | |
68 | ARG_CONST_STACK_SIZE, /* number of bytes accessed from stack */ | |
8e2fe1d9 | 69 | ARG_CONST_STACK_SIZE_OR_ZERO, /* number of bytes accessed from stack or 0 */ |
80f1d68c | 70 | |
608cd71a | 71 | ARG_PTR_TO_CTX, /* pointer to context */ |
80f1d68c | 72 | ARG_ANYTHING, /* any (initialized) argument is ok */ |
17a52670 AS |
73 | }; |
74 | ||
75 | /* type of values returned from helper functions */ | |
76 | enum bpf_return_type { | |
77 | RET_INTEGER, /* function returns integer */ | |
78 | RET_VOID, /* function doesn't return anything */ | |
79 | RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */ | |
80 | }; | |
81 | ||
09756af4 AS |
82 | /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs |
83 | * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL | |
84 | * instructions after verifying | |
85 | */ | |
86 | struct bpf_func_proto { | |
87 | u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); | |
88 | bool gpl_only; | |
17a52670 AS |
89 | enum bpf_return_type ret_type; |
90 | enum bpf_arg_type arg1_type; | |
91 | enum bpf_arg_type arg2_type; | |
92 | enum bpf_arg_type arg3_type; | |
93 | enum bpf_arg_type arg4_type; | |
94 | enum bpf_arg_type arg5_type; | |
95 | }; | |
96 | ||
97 | /* bpf_context is intentionally undefined structure. Pointer to bpf_context is | |
98 | * the first argument to eBPF programs. | |
99 | * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' | |
100 | */ | |
101 | struct bpf_context; | |
102 | ||
103 | enum bpf_access_type { | |
104 | BPF_READ = 1, | |
105 | BPF_WRITE = 2 | |
09756af4 AS |
106 | }; |
107 | ||
ff936a04 AS |
108 | struct bpf_prog; |
109 | ||
09756af4 AS |
110 | struct bpf_verifier_ops { |
111 | /* return eBPF function prototype for verification */ | |
112 | const struct bpf_func_proto *(*get_func_proto)(enum bpf_func_id func_id); | |
17a52670 AS |
113 | |
114 | /* return true if 'size' wide access at offset 'off' within bpf_context | |
115 | * with 'type' (read or write) is allowed | |
116 | */ | |
117 | bool (*is_valid_access)(int off, int size, enum bpf_access_type type); | |
9bac3d6d | 118 | |
d691f9e8 AS |
119 | u32 (*convert_ctx_access)(enum bpf_access_type type, int dst_reg, |
120 | int src_reg, int ctx_off, | |
ff936a04 | 121 | struct bpf_insn *insn, struct bpf_prog *prog); |
09756af4 AS |
122 | }; |
123 | ||
124 | struct bpf_prog_type_list { | |
125 | struct list_head list_node; | |
a2c83fff | 126 | const struct bpf_verifier_ops *ops; |
09756af4 AS |
127 | enum bpf_prog_type type; |
128 | }; | |
129 | ||
09756af4 AS |
130 | struct bpf_prog_aux { |
131 | atomic_t refcnt; | |
24701ece | 132 | u32 used_map_cnt; |
a2c83fff | 133 | const struct bpf_verifier_ops *ops; |
09756af4 | 134 | struct bpf_map **used_maps; |
09756af4 | 135 | struct bpf_prog *prog; |
aaac3ba9 | 136 | struct user_struct *user; |
abf2e7d6 AS |
137 | union { |
138 | struct work_struct work; | |
139 | struct rcu_head rcu; | |
140 | }; | |
09756af4 AS |
141 | }; |
142 | ||
04fd61ab AS |
143 | struct bpf_array { |
144 | struct bpf_map map; | |
145 | u32 elem_size; | |
146 | /* 'ownership' of prog_array is claimed by the first program that | |
147 | * is going to use this map or by the first program which FD is stored | |
148 | * in the map to make sure that all callers and callees have the same | |
149 | * prog_type and JITed flag | |
150 | */ | |
151 | enum bpf_prog_type owner_prog_type; | |
152 | bool owner_jited; | |
153 | union { | |
154 | char value[0] __aligned(8); | |
2a36f0b9 | 155 | void *ptrs[0] __aligned(8); |
a10423b8 | 156 | void __percpu *pptrs[0] __aligned(8); |
04fd61ab AS |
157 | }; |
158 | }; | |
159 | #define MAX_TAIL_CALL_CNT 32 | |
160 | ||
161 | u64 bpf_tail_call(u64 ctx, u64 r2, u64 index, u64 r4, u64 r5); | |
2a36f0b9 | 162 | void bpf_fd_array_map_clear(struct bpf_map *map); |
04fd61ab | 163 | bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); |
0756ea3e | 164 | const struct bpf_func_proto *bpf_get_trace_printk_proto(void); |
04fd61ab | 165 | |
89aa0758 | 166 | #ifdef CONFIG_BPF_SYSCALL |
b121d1e7 AS |
167 | DECLARE_PER_CPU(int, bpf_prog_active); |
168 | ||
0fc174de | 169 | void bpf_register_prog_type(struct bpf_prog_type_list *tl); |
61e021f3 | 170 | void bpf_register_map_type(struct bpf_map_type_list *tl); |
0fc174de | 171 | |
0fc174de | 172 | struct bpf_prog *bpf_prog_get(u32 ufd); |
61e021f3 | 173 | void bpf_prog_put(struct bpf_prog *prog); |
abf2e7d6 | 174 | void bpf_prog_put_rcu(struct bpf_prog *prog); |
61e021f3 | 175 | |
c9da161c | 176 | struct bpf_map *bpf_map_get_with_uref(u32 ufd); |
c2101297 | 177 | struct bpf_map *__bpf_map_get(struct fd f); |
c9da161c DB |
178 | void bpf_map_inc(struct bpf_map *map, bool uref); |
179 | void bpf_map_put_with_uref(struct bpf_map *map); | |
61e021f3 DB |
180 | void bpf_map_put(struct bpf_map *map); |
181 | ||
1be7f75d AS |
182 | extern int sysctl_unprivileged_bpf_disabled; |
183 | ||
b2197755 DB |
184 | int bpf_map_new_fd(struct bpf_map *map); |
185 | int bpf_prog_new_fd(struct bpf_prog *prog); | |
186 | ||
187 | int bpf_obj_pin_user(u32 ufd, const char __user *pathname); | |
188 | int bpf_obj_get_user(const char __user *pathname); | |
189 | ||
15a07b33 AS |
190 | int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); |
191 | int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); | |
192 | int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, | |
193 | u64 flags); | |
194 | int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, | |
195 | u64 flags); | |
196 | ||
197 | /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and | |
198 | * forced to use 'long' read/writes to try to atomically copy long counters. | |
199 | * Best-effort only. No barriers here, since it _will_ race with concurrent | |
200 | * updates from BPF programs. Called from bpf syscall and mostly used with | |
201 | * size 8 or 16 bytes, so ask compiler to inline it. | |
202 | */ | |
203 | static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) | |
204 | { | |
205 | const long *lsrc = src; | |
206 | long *ldst = dst; | |
207 | ||
208 | size /= sizeof(long); | |
209 | while (size--) | |
210 | *ldst++ = *lsrc++; | |
211 | } | |
212 | ||
61e021f3 | 213 | /* verify correctness of eBPF program */ |
9bac3d6d | 214 | int bpf_check(struct bpf_prog **fp, union bpf_attr *attr); |
89aa0758 | 215 | #else |
0fc174de DB |
216 | static inline void bpf_register_prog_type(struct bpf_prog_type_list *tl) |
217 | { | |
218 | } | |
219 | ||
220 | static inline struct bpf_prog *bpf_prog_get(u32 ufd) | |
221 | { | |
222 | return ERR_PTR(-EOPNOTSUPP); | |
223 | } | |
224 | ||
225 | static inline void bpf_prog_put(struct bpf_prog *prog) | |
226 | { | |
227 | } | |
61e021f3 | 228 | #endif /* CONFIG_BPF_SYSCALL */ |
09756af4 | 229 | |
d0003ec0 | 230 | /* verifier prototypes for helper functions called from eBPF programs */ |
a2c83fff DB |
231 | extern const struct bpf_func_proto bpf_map_lookup_elem_proto; |
232 | extern const struct bpf_func_proto bpf_map_update_elem_proto; | |
233 | extern const struct bpf_func_proto bpf_map_delete_elem_proto; | |
d0003ec0 | 234 | |
03e69b50 | 235 | extern const struct bpf_func_proto bpf_get_prandom_u32_proto; |
c04167ce | 236 | extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; |
04fd61ab | 237 | extern const struct bpf_func_proto bpf_tail_call_proto; |
17ca8cbf | 238 | extern const struct bpf_func_proto bpf_ktime_get_ns_proto; |
ffeedafb AS |
239 | extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; |
240 | extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; | |
241 | extern const struct bpf_func_proto bpf_get_current_comm_proto; | |
4e10df9a AS |
242 | extern const struct bpf_func_proto bpf_skb_vlan_push_proto; |
243 | extern const struct bpf_func_proto bpf_skb_vlan_pop_proto; | |
d5a3b1f6 | 244 | extern const struct bpf_func_proto bpf_get_stackid_proto; |
03e69b50 | 245 | |
3ad00405 DB |
246 | /* Shared helpers among cBPF and eBPF. */ |
247 | void bpf_user_rnd_init_once(void); | |
248 | u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); | |
249 | ||
99c55f7d | 250 | #endif /* _LINUX_BPF_H */ |