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Merge tag 'linux-kselftest-4.10-rc1-update' of git://git.kernel.org/pub/scm/linux...
[mirror_ubuntu-artful-kernel.git] / samples / bpf / libbpf.h
1 /* eBPF mini library */
2 #ifndef __LIBBPF_H
3 #define __LIBBPF_H
4
5 struct bpf_insn;
6
7 int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size,
8 int max_entries, int map_flags);
9 int bpf_update_elem(int fd, void *key, void *value, unsigned long long flags);
10 int bpf_lookup_elem(int fd, void *key, void *value);
11 int bpf_delete_elem(int fd, void *key);
12 int bpf_get_next_key(int fd, void *key, void *next_key);
13
14 int bpf_prog_load(enum bpf_prog_type prog_type,
15 const struct bpf_insn *insns, int insn_len,
16 const char *license, int kern_version);
17
18 int bpf_prog_attach(int prog_fd, int attachable_fd, enum bpf_attach_type type);
19 int bpf_prog_detach(int attachable_fd, enum bpf_attach_type type);
20
21 int bpf_obj_pin(int fd, const char *pathname);
22 int bpf_obj_get(const char *pathname);
23
24 #define LOG_BUF_SIZE (256 * 1024)
25 extern char bpf_log_buf[LOG_BUF_SIZE];
26
27 /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
28
29 #define BPF_ALU64_REG(OP, DST, SRC) \
30 ((struct bpf_insn) { \
31 .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \
32 .dst_reg = DST, \
33 .src_reg = SRC, \
34 .off = 0, \
35 .imm = 0 })
36
37 #define BPF_ALU32_REG(OP, DST, SRC) \
38 ((struct bpf_insn) { \
39 .code = BPF_ALU | BPF_OP(OP) | BPF_X, \
40 .dst_reg = DST, \
41 .src_reg = SRC, \
42 .off = 0, \
43 .imm = 0 })
44
45 /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
46
47 #define BPF_ALU64_IMM(OP, DST, IMM) \
48 ((struct bpf_insn) { \
49 .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \
50 .dst_reg = DST, \
51 .src_reg = 0, \
52 .off = 0, \
53 .imm = IMM })
54
55 #define BPF_ALU32_IMM(OP, DST, IMM) \
56 ((struct bpf_insn) { \
57 .code = BPF_ALU | BPF_OP(OP) | BPF_K, \
58 .dst_reg = DST, \
59 .src_reg = 0, \
60 .off = 0, \
61 .imm = IMM })
62
63 /* Short form of mov, dst_reg = src_reg */
64
65 #define BPF_MOV64_REG(DST, SRC) \
66 ((struct bpf_insn) { \
67 .code = BPF_ALU64 | BPF_MOV | BPF_X, \
68 .dst_reg = DST, \
69 .src_reg = SRC, \
70 .off = 0, \
71 .imm = 0 })
72
73 #define BPF_MOV32_REG(DST, SRC) \
74 ((struct bpf_insn) { \
75 .code = BPF_ALU | BPF_MOV | BPF_X, \
76 .dst_reg = DST, \
77 .src_reg = SRC, \
78 .off = 0, \
79 .imm = 0 })
80
81 /* Short form of mov, dst_reg = imm32 */
82
83 #define BPF_MOV64_IMM(DST, IMM) \
84 ((struct bpf_insn) { \
85 .code = BPF_ALU64 | BPF_MOV | BPF_K, \
86 .dst_reg = DST, \
87 .src_reg = 0, \
88 .off = 0, \
89 .imm = IMM })
90
91 #define BPF_MOV32_IMM(DST, IMM) \
92 ((struct bpf_insn) { \
93 .code = BPF_ALU | BPF_MOV | BPF_K, \
94 .dst_reg = DST, \
95 .src_reg = 0, \
96 .off = 0, \
97 .imm = IMM })
98
99 /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
100 #define BPF_LD_IMM64(DST, IMM) \
101 BPF_LD_IMM64_RAW(DST, 0, IMM)
102
103 #define BPF_LD_IMM64_RAW(DST, SRC, IMM) \
104 ((struct bpf_insn) { \
105 .code = BPF_LD | BPF_DW | BPF_IMM, \
106 .dst_reg = DST, \
107 .src_reg = SRC, \
108 .off = 0, \
109 .imm = (__u32) (IMM) }), \
110 ((struct bpf_insn) { \
111 .code = 0, /* zero is reserved opcode */ \
112 .dst_reg = 0, \
113 .src_reg = 0, \
114 .off = 0, \
115 .imm = ((__u64) (IMM)) >> 32 })
116
117 #ifndef BPF_PSEUDO_MAP_FD
118 # define BPF_PSEUDO_MAP_FD 1
119 #endif
120
121 /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
122 #define BPF_LD_MAP_FD(DST, MAP_FD) \
123 BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
124
125
126 /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
127
128 #define BPF_LD_ABS(SIZE, IMM) \
129 ((struct bpf_insn) { \
130 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \
131 .dst_reg = 0, \
132 .src_reg = 0, \
133 .off = 0, \
134 .imm = IMM })
135
136 /* Memory load, dst_reg = *(uint *) (src_reg + off16) */
137
138 #define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \
139 ((struct bpf_insn) { \
140 .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \
141 .dst_reg = DST, \
142 .src_reg = SRC, \
143 .off = OFF, \
144 .imm = 0 })
145
146 /* Memory store, *(uint *) (dst_reg + off16) = src_reg */
147
148 #define BPF_STX_MEM(SIZE, DST, SRC, OFF) \
149 ((struct bpf_insn) { \
150 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \
151 .dst_reg = DST, \
152 .src_reg = SRC, \
153 .off = OFF, \
154 .imm = 0 })
155
156 /* Memory store, *(uint *) (dst_reg + off16) = imm32 */
157
158 #define BPF_ST_MEM(SIZE, DST, OFF, IMM) \
159 ((struct bpf_insn) { \
160 .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \
161 .dst_reg = DST, \
162 .src_reg = 0, \
163 .off = OFF, \
164 .imm = IMM })
165
166 /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
167
168 #define BPF_JMP_REG(OP, DST, SRC, OFF) \
169 ((struct bpf_insn) { \
170 .code = BPF_JMP | BPF_OP(OP) | BPF_X, \
171 .dst_reg = DST, \
172 .src_reg = SRC, \
173 .off = OFF, \
174 .imm = 0 })
175
176 /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
177
178 #define BPF_JMP_IMM(OP, DST, IMM, OFF) \
179 ((struct bpf_insn) { \
180 .code = BPF_JMP | BPF_OP(OP) | BPF_K, \
181 .dst_reg = DST, \
182 .src_reg = 0, \
183 .off = OFF, \
184 .imm = IMM })
185
186 /* Raw code statement block */
187
188 #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \
189 ((struct bpf_insn) { \
190 .code = CODE, \
191 .dst_reg = DST, \
192 .src_reg = SRC, \
193 .off = OFF, \
194 .imm = IMM })
195
196 /* Program exit */
197
198 #define BPF_EXIT_INSN() \
199 ((struct bpf_insn) { \
200 .code = BPF_JMP | BPF_EXIT, \
201 .dst_reg = 0, \
202 .src_reg = 0, \
203 .off = 0, \
204 .imm = 0 })
205
206 /* create RAW socket and bind to interface 'name' */
207 int open_raw_sock(const char *name);
208
209 struct perf_event_attr;
210 int perf_event_open(struct perf_event_attr *attr, int pid, int cpu,
211 int group_fd, unsigned long flags);
212 #endif
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