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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> |
99c55f7d AS |
13 | |
14 | struct bpf_map; | |
15 | ||
16 | /* map is generic key/value storage optionally accesible by eBPF programs */ | |
17 | struct bpf_map_ops { | |
18 | /* funcs callable from userspace (via syscall) */ | |
19 | struct bpf_map *(*map_alloc)(union bpf_attr *attr); | |
20 | void (*map_free)(struct bpf_map *); | |
db20fd2b AS |
21 | int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key); |
22 | ||
23 | /* funcs callable from userspace and from eBPF programs */ | |
24 | void *(*map_lookup_elem)(struct bpf_map *map, void *key); | |
3274f520 | 25 | int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags); |
db20fd2b | 26 | int (*map_delete_elem)(struct bpf_map *map, void *key); |
2a36f0b9 WN |
27 | |
28 | /* funcs called by prog_array and perf_event_array map */ | |
29 | void *(*map_fd_get_ptr) (struct bpf_map *map, int fd); | |
30 | void (*map_fd_put_ptr) (void *ptr); | |
99c55f7d AS |
31 | }; |
32 | ||
33 | struct bpf_map { | |
34 | atomic_t refcnt; | |
35 | enum bpf_map_type map_type; | |
36 | u32 key_size; | |
37 | u32 value_size; | |
38 | u32 max_entries; | |
a2c83fff | 39 | const struct bpf_map_ops *ops; |
99c55f7d AS |
40 | struct work_struct work; |
41 | }; | |
42 | ||
43 | struct bpf_map_type_list { | |
44 | struct list_head list_node; | |
a2c83fff | 45 | const struct bpf_map_ops *ops; |
99c55f7d AS |
46 | enum bpf_map_type type; |
47 | }; | |
48 | ||
17a52670 AS |
49 | /* function argument constraints */ |
50 | enum bpf_arg_type { | |
80f1d68c | 51 | ARG_DONTCARE = 0, /* unused argument in helper function */ |
17a52670 AS |
52 | |
53 | /* the following constraints used to prototype | |
54 | * bpf_map_lookup/update/delete_elem() functions | |
55 | */ | |
56 | ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ | |
57 | ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ | |
58 | ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ | |
59 | ||
60 | /* the following constraints used to prototype bpf_memcmp() and other | |
61 | * functions that access data on eBPF program stack | |
62 | */ | |
63 | ARG_PTR_TO_STACK, /* any pointer to eBPF program stack */ | |
64 | ARG_CONST_STACK_SIZE, /* number of bytes accessed from stack */ | |
80f1d68c | 65 | |
608cd71a | 66 | ARG_PTR_TO_CTX, /* pointer to context */ |
80f1d68c | 67 | ARG_ANYTHING, /* any (initialized) argument is ok */ |
17a52670 AS |
68 | }; |
69 | ||
70 | /* type of values returned from helper functions */ | |
71 | enum bpf_return_type { | |
72 | RET_INTEGER, /* function returns integer */ | |
73 | RET_VOID, /* function doesn't return anything */ | |
74 | RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */ | |
75 | }; | |
76 | ||
09756af4 AS |
77 | /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs |
78 | * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL | |
79 | * instructions after verifying | |
80 | */ | |
81 | struct bpf_func_proto { | |
82 | u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); | |
83 | bool gpl_only; | |
17a52670 AS |
84 | enum bpf_return_type ret_type; |
85 | enum bpf_arg_type arg1_type; | |
86 | enum bpf_arg_type arg2_type; | |
87 | enum bpf_arg_type arg3_type; | |
88 | enum bpf_arg_type arg4_type; | |
89 | enum bpf_arg_type arg5_type; | |
90 | }; | |
91 | ||
92 | /* bpf_context is intentionally undefined structure. Pointer to bpf_context is | |
93 | * the first argument to eBPF programs. | |
94 | * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' | |
95 | */ | |
96 | struct bpf_context; | |
97 | ||
98 | enum bpf_access_type { | |
99 | BPF_READ = 1, | |
100 | BPF_WRITE = 2 | |
09756af4 AS |
101 | }; |
102 | ||
103 | struct bpf_verifier_ops { | |
104 | /* return eBPF function prototype for verification */ | |
105 | const struct bpf_func_proto *(*get_func_proto)(enum bpf_func_id func_id); | |
17a52670 AS |
106 | |
107 | /* return true if 'size' wide access at offset 'off' within bpf_context | |
108 | * with 'type' (read or write) is allowed | |
109 | */ | |
110 | bool (*is_valid_access)(int off, int size, enum bpf_access_type type); | |
9bac3d6d | 111 | |
d691f9e8 AS |
112 | u32 (*convert_ctx_access)(enum bpf_access_type type, int dst_reg, |
113 | int src_reg, int ctx_off, | |
9bac3d6d | 114 | struct bpf_insn *insn); |
09756af4 AS |
115 | }; |
116 | ||
117 | struct bpf_prog_type_list { | |
118 | struct list_head list_node; | |
a2c83fff | 119 | const struct bpf_verifier_ops *ops; |
09756af4 AS |
120 | enum bpf_prog_type type; |
121 | }; | |
122 | ||
09756af4 AS |
123 | struct bpf_prog; |
124 | ||
125 | struct bpf_prog_aux { | |
126 | atomic_t refcnt; | |
24701ece | 127 | u32 used_map_cnt; |
a2c83fff | 128 | const struct bpf_verifier_ops *ops; |
09756af4 | 129 | struct bpf_map **used_maps; |
09756af4 | 130 | struct bpf_prog *prog; |
abf2e7d6 AS |
131 | union { |
132 | struct work_struct work; | |
133 | struct rcu_head rcu; | |
134 | }; | |
09756af4 AS |
135 | }; |
136 | ||
04fd61ab AS |
137 | struct bpf_array { |
138 | struct bpf_map map; | |
139 | u32 elem_size; | |
140 | /* 'ownership' of prog_array is claimed by the first program that | |
141 | * is going to use this map or by the first program which FD is stored | |
142 | * in the map to make sure that all callers and callees have the same | |
143 | * prog_type and JITed flag | |
144 | */ | |
145 | enum bpf_prog_type owner_prog_type; | |
146 | bool owner_jited; | |
147 | union { | |
148 | char value[0] __aligned(8); | |
2a36f0b9 | 149 | void *ptrs[0] __aligned(8); |
04fd61ab AS |
150 | }; |
151 | }; | |
152 | #define MAX_TAIL_CALL_CNT 32 | |
153 | ||
154 | u64 bpf_tail_call(u64 ctx, u64 r2, u64 index, u64 r4, u64 r5); | |
2a36f0b9 | 155 | void bpf_fd_array_map_clear(struct bpf_map *map); |
04fd61ab | 156 | bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); |
0756ea3e | 157 | const struct bpf_func_proto *bpf_get_trace_printk_proto(void); |
04fd61ab | 158 | |
89aa0758 | 159 | #ifdef CONFIG_BPF_SYSCALL |
0fc174de | 160 | void bpf_register_prog_type(struct bpf_prog_type_list *tl); |
61e021f3 | 161 | void bpf_register_map_type(struct bpf_map_type_list *tl); |
0fc174de | 162 | |
0fc174de | 163 | struct bpf_prog *bpf_prog_get(u32 ufd); |
61e021f3 | 164 | void bpf_prog_put(struct bpf_prog *prog); |
abf2e7d6 | 165 | void bpf_prog_put_rcu(struct bpf_prog *prog); |
61e021f3 DB |
166 | |
167 | struct bpf_map *bpf_map_get(struct fd f); | |
168 | void bpf_map_put(struct bpf_map *map); | |
169 | ||
170 | /* verify correctness of eBPF program */ | |
9bac3d6d | 171 | int bpf_check(struct bpf_prog **fp, union bpf_attr *attr); |
89aa0758 | 172 | #else |
0fc174de DB |
173 | static inline void bpf_register_prog_type(struct bpf_prog_type_list *tl) |
174 | { | |
175 | } | |
176 | ||
177 | static inline struct bpf_prog *bpf_prog_get(u32 ufd) | |
178 | { | |
179 | return ERR_PTR(-EOPNOTSUPP); | |
180 | } | |
181 | ||
182 | static inline void bpf_prog_put(struct bpf_prog *prog) | |
183 | { | |
184 | } | |
61e021f3 | 185 | #endif /* CONFIG_BPF_SYSCALL */ |
09756af4 | 186 | |
d0003ec0 | 187 | /* verifier prototypes for helper functions called from eBPF programs */ |
a2c83fff DB |
188 | extern const struct bpf_func_proto bpf_map_lookup_elem_proto; |
189 | extern const struct bpf_func_proto bpf_map_update_elem_proto; | |
190 | extern const struct bpf_func_proto bpf_map_delete_elem_proto; | |
d0003ec0 | 191 | |
35578d79 | 192 | extern const struct bpf_func_proto bpf_perf_event_read_proto; |
03e69b50 | 193 | extern const struct bpf_func_proto bpf_get_prandom_u32_proto; |
c04167ce | 194 | extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; |
04fd61ab | 195 | extern const struct bpf_func_proto bpf_tail_call_proto; |
17ca8cbf | 196 | extern const struct bpf_func_proto bpf_ktime_get_ns_proto; |
ffeedafb AS |
197 | extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; |
198 | extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; | |
199 | extern const struct bpf_func_proto bpf_get_current_comm_proto; | |
4e10df9a AS |
200 | extern const struct bpf_func_proto bpf_skb_vlan_push_proto; |
201 | extern const struct bpf_func_proto bpf_skb_vlan_pop_proto; | |
03e69b50 | 202 | |
99c55f7d | 203 | #endif /* _LINUX_BPF_H */ |