Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* eBPF mini library */
2#ifndef __LIBBPF_H
3#define __LIBBPF_H
4
5struct bpf_insn;
6
7int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size,
8 int max_entries, int map_flags);
9int bpf_update_elem(int fd, void *key, void *value, unsigned long long flags);
10int bpf_lookup_elem(int fd, void *key, void *value);
11int bpf_delete_elem(int fd, void *key);
12int bpf_get_next_key(int fd, void *key, void *next_key);
13
14int 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
18int bpf_obj_pin(int fd, const char *pathname);
19int bpf_obj_get(const char *pathname);
20
21#define LOG_BUF_SIZE 65536
22extern char bpf_log_buf[LOG_BUF_SIZE];
23
24/* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
25
26#define BPF_ALU64_REG(OP, DST, SRC) \
27 ((struct bpf_insn) { \
28 .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \
29 .dst_reg = DST, \
30 .src_reg = SRC, \
31 .off = 0, \
32 .imm = 0 })
33
34#define BPF_ALU32_REG(OP, DST, SRC) \
35 ((struct bpf_insn) { \
36 .code = BPF_ALU | BPF_OP(OP) | BPF_X, \
37 .dst_reg = DST, \
38 .src_reg = SRC, \
39 .off = 0, \
40 .imm = 0 })
41
42/* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
43
44#define BPF_ALU64_IMM(OP, DST, IMM) \
45 ((struct bpf_insn) { \
46 .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \
47 .dst_reg = DST, \
48 .src_reg = 0, \
49 .off = 0, \
50 .imm = IMM })
51
52#define BPF_ALU32_IMM(OP, DST, IMM) \
53 ((struct bpf_insn) { \
54 .code = BPF_ALU | BPF_OP(OP) | BPF_K, \
55 .dst_reg = DST, \
56 .src_reg = 0, \
57 .off = 0, \
58 .imm = IMM })
59
60/* Short form of mov, dst_reg = src_reg */
61
62#define BPF_MOV64_REG(DST, SRC) \
63 ((struct bpf_insn) { \
64 .code = BPF_ALU64 | BPF_MOV | BPF_X, \
65 .dst_reg = DST, \
66 .src_reg = SRC, \
67 .off = 0, \
68 .imm = 0 })
69
70#define BPF_MOV32_REG(DST, SRC) \
71 ((struct bpf_insn) { \
72 .code = BPF_ALU | BPF_MOV | BPF_X, \
73 .dst_reg = DST, \
74 .src_reg = SRC, \
75 .off = 0, \
76 .imm = 0 })
77
78/* Short form of mov, dst_reg = imm32 */
79
80#define BPF_MOV64_IMM(DST, IMM) \
81 ((struct bpf_insn) { \
82 .code = BPF_ALU64 | BPF_MOV | BPF_K, \
83 .dst_reg = DST, \
84 .src_reg = 0, \
85 .off = 0, \
86 .imm = IMM })
87
88/* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
89#define BPF_LD_IMM64(DST, IMM) \
90 BPF_LD_IMM64_RAW(DST, 0, IMM)
91
92#define BPF_LD_IMM64_RAW(DST, SRC, IMM) \
93 ((struct bpf_insn) { \
94 .code = BPF_LD | BPF_DW | BPF_IMM, \
95 .dst_reg = DST, \
96 .src_reg = SRC, \
97 .off = 0, \
98 .imm = (__u32) (IMM) }), \
99 ((struct bpf_insn) { \
100 .code = 0, /* zero is reserved opcode */ \
101 .dst_reg = 0, \
102 .src_reg = 0, \
103 .off = 0, \
104 .imm = ((__u64) (IMM)) >> 32 })
105
106#ifndef BPF_PSEUDO_MAP_FD
107# define BPF_PSEUDO_MAP_FD 1
108#endif
109
110/* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
111#define BPF_LD_MAP_FD(DST, MAP_FD) \
112 BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
113
114
115/* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
116
117#define BPF_LD_ABS(SIZE, IMM) \
118 ((struct bpf_insn) { \
119 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \
120 .dst_reg = 0, \
121 .src_reg = 0, \
122 .off = 0, \
123 .imm = IMM })
124
125/* Memory load, dst_reg = *(uint *) (src_reg + off16) */
126
127#define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \
128 ((struct bpf_insn) { \
129 .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \
130 .dst_reg = DST, \
131 .src_reg = SRC, \
132 .off = OFF, \
133 .imm = 0 })
134
135/* Memory store, *(uint *) (dst_reg + off16) = src_reg */
136
137#define BPF_STX_MEM(SIZE, DST, SRC, OFF) \
138 ((struct bpf_insn) { \
139 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \
140 .dst_reg = DST, \
141 .src_reg = SRC, \
142 .off = OFF, \
143 .imm = 0 })
144
145/* Memory store, *(uint *) (dst_reg + off16) = imm32 */
146
147#define BPF_ST_MEM(SIZE, DST, OFF, IMM) \
148 ((struct bpf_insn) { \
149 .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \
150 .dst_reg = DST, \
151 .src_reg = 0, \
152 .off = OFF, \
153 .imm = IMM })
154
155/* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
156
157#define BPF_JMP_REG(OP, DST, SRC, OFF) \
158 ((struct bpf_insn) { \
159 .code = BPF_JMP | BPF_OP(OP) | BPF_X, \
160 .dst_reg = DST, \
161 .src_reg = SRC, \
162 .off = OFF, \
163 .imm = 0 })
164
165/* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
166
167#define BPF_JMP_IMM(OP, DST, IMM, OFF) \
168 ((struct bpf_insn) { \
169 .code = BPF_JMP | BPF_OP(OP) | BPF_K, \
170 .dst_reg = DST, \
171 .src_reg = 0, \
172 .off = OFF, \
173 .imm = IMM })
174
175/* Raw code statement block */
176
177#define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \
178 ((struct bpf_insn) { \
179 .code = CODE, \
180 .dst_reg = DST, \
181 .src_reg = SRC, \
182 .off = OFF, \
183 .imm = IMM })
184
185/* Program exit */
186
187#define BPF_EXIT_INSN() \
188 ((struct bpf_insn) { \
189 .code = BPF_JMP | BPF_EXIT, \
190 .dst_reg = 0, \
191 .src_reg = 0, \
192 .off = 0, \
193 .imm = 0 })
194
195/* create RAW socket and bind to interface 'name' */
196int open_raw_sock(const char *name);
197
198struct perf_event_attr;
199int perf_event_open(struct perf_event_attr *attr, int pid, int cpu,
200 int group_fd, unsigned long flags);
201#endif