Commit | Line | Data |
---|---|---|
3c731eba AS |
1 | /* eBPF mini library */ |
2 | #ifndef __LIBBPF_H | |
3 | #define __LIBBPF_H | |
4 | ||
43371c83 | 5 | #include <bpf/bpf.h> |
3c731eba | 6 | |
43371c83 | 7 | struct bpf_insn; |
3c731eba | 8 | |
3c731eba AS |
9 | /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */ |
10 | ||
11 | #define BPF_ALU64_REG(OP, DST, SRC) \ | |
12 | ((struct bpf_insn) { \ | |
13 | .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \ | |
14 | .dst_reg = DST, \ | |
15 | .src_reg = SRC, \ | |
16 | .off = 0, \ | |
17 | .imm = 0 }) | |
18 | ||
19 | #define BPF_ALU32_REG(OP, DST, SRC) \ | |
20 | ((struct bpf_insn) { \ | |
21 | .code = BPF_ALU | BPF_OP(OP) | BPF_X, \ | |
22 | .dst_reg = DST, \ | |
23 | .src_reg = SRC, \ | |
24 | .off = 0, \ | |
25 | .imm = 0 }) | |
26 | ||
27 | /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */ | |
28 | ||
29 | #define BPF_ALU64_IMM(OP, DST, IMM) \ | |
30 | ((struct bpf_insn) { \ | |
31 | .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \ | |
32 | .dst_reg = DST, \ | |
33 | .src_reg = 0, \ | |
34 | .off = 0, \ | |
35 | .imm = IMM }) | |
36 | ||
37 | #define BPF_ALU32_IMM(OP, DST, IMM) \ | |
38 | ((struct bpf_insn) { \ | |
39 | .code = BPF_ALU | BPF_OP(OP) | BPF_K, \ | |
40 | .dst_reg = DST, \ | |
41 | .src_reg = 0, \ | |
42 | .off = 0, \ | |
43 | .imm = IMM }) | |
44 | ||
45 | /* Short form of mov, dst_reg = src_reg */ | |
46 | ||
47 | #define BPF_MOV64_REG(DST, SRC) \ | |
48 | ((struct bpf_insn) { \ | |
49 | .code = BPF_ALU64 | BPF_MOV | BPF_X, \ | |
50 | .dst_reg = DST, \ | |
51 | .src_reg = SRC, \ | |
52 | .off = 0, \ | |
53 | .imm = 0 }) | |
54 | ||
bf508877 AS |
55 | #define BPF_MOV32_REG(DST, SRC) \ |
56 | ((struct bpf_insn) { \ | |
57 | .code = BPF_ALU | BPF_MOV | BPF_X, \ | |
58 | .dst_reg = DST, \ | |
59 | .src_reg = SRC, \ | |
60 | .off = 0, \ | |
61 | .imm = 0 }) | |
62 | ||
3c731eba AS |
63 | /* Short form of mov, dst_reg = imm32 */ |
64 | ||
65 | #define BPF_MOV64_IMM(DST, IMM) \ | |
66 | ((struct bpf_insn) { \ | |
67 | .code = BPF_ALU64 | BPF_MOV | BPF_K, \ | |
68 | .dst_reg = DST, \ | |
69 | .src_reg = 0, \ | |
70 | .off = 0, \ | |
48461135 JB |
71 | .imm = IMM }) |
72 | ||
73 | #define BPF_MOV32_IMM(DST, IMM) \ | |
74 | ((struct bpf_insn) { \ | |
75 | .code = BPF_ALU | BPF_MOV | BPF_K, \ | |
76 | .dst_reg = DST, \ | |
77 | .src_reg = 0, \ | |
78 | .off = 0, \ | |
3c731eba AS |
79 | .imm = IMM }) |
80 | ||
81 | /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */ | |
82 | #define BPF_LD_IMM64(DST, IMM) \ | |
83 | BPF_LD_IMM64_RAW(DST, 0, IMM) | |
84 | ||
85 | #define BPF_LD_IMM64_RAW(DST, SRC, IMM) \ | |
86 | ((struct bpf_insn) { \ | |
87 | .code = BPF_LD | BPF_DW | BPF_IMM, \ | |
88 | .dst_reg = DST, \ | |
89 | .src_reg = SRC, \ | |
90 | .off = 0, \ | |
91 | .imm = (__u32) (IMM) }), \ | |
92 | ((struct bpf_insn) { \ | |
93 | .code = 0, /* zero is reserved opcode */ \ | |
94 | .dst_reg = 0, \ | |
95 | .src_reg = 0, \ | |
96 | .off = 0, \ | |
97 | .imm = ((__u64) (IMM)) >> 32 }) | |
98 | ||
f1a66f85 DB |
99 | #ifndef BPF_PSEUDO_MAP_FD |
100 | # define BPF_PSEUDO_MAP_FD 1 | |
101 | #endif | |
3c731eba AS |
102 | |
103 | /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */ | |
104 | #define BPF_LD_MAP_FD(DST, MAP_FD) \ | |
105 | BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD) | |
106 | ||
107 | ||
03f4723e AS |
108 | /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */ |
109 | ||
110 | #define BPF_LD_ABS(SIZE, IMM) \ | |
111 | ((struct bpf_insn) { \ | |
112 | .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \ | |
113 | .dst_reg = 0, \ | |
114 | .src_reg = 0, \ | |
115 | .off = 0, \ | |
116 | .imm = IMM }) | |
117 | ||
3c731eba AS |
118 | /* Memory load, dst_reg = *(uint *) (src_reg + off16) */ |
119 | ||
120 | #define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \ | |
121 | ((struct bpf_insn) { \ | |
122 | .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \ | |
123 | .dst_reg = DST, \ | |
124 | .src_reg = SRC, \ | |
125 | .off = OFF, \ | |
126 | .imm = 0 }) | |
127 | ||
128 | /* Memory store, *(uint *) (dst_reg + off16) = src_reg */ | |
129 | ||
130 | #define BPF_STX_MEM(SIZE, DST, SRC, OFF) \ | |
131 | ((struct bpf_insn) { \ | |
132 | .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \ | |
133 | .dst_reg = DST, \ | |
134 | .src_reg = SRC, \ | |
135 | .off = OFF, \ | |
136 | .imm = 0 }) | |
137 | ||
51570a5a CF |
138 | /* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */ |
139 | ||
140 | #define BPF_STX_XADD(SIZE, DST, SRC, OFF) \ | |
141 | ((struct bpf_insn) { \ | |
142 | .code = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD, \ | |
143 | .dst_reg = DST, \ | |
144 | .src_reg = SRC, \ | |
145 | .off = OFF, \ | |
146 | .imm = 0 }) | |
147 | ||
3c731eba AS |
148 | /* Memory store, *(uint *) (dst_reg + off16) = imm32 */ |
149 | ||
150 | #define BPF_ST_MEM(SIZE, DST, OFF, IMM) \ | |
151 | ((struct bpf_insn) { \ | |
152 | .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \ | |
153 | .dst_reg = DST, \ | |
154 | .src_reg = 0, \ | |
155 | .off = OFF, \ | |
156 | .imm = IMM }) | |
157 | ||
158 | /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */ | |
159 | ||
160 | #define BPF_JMP_REG(OP, DST, SRC, OFF) \ | |
161 | ((struct bpf_insn) { \ | |
162 | .code = BPF_JMP | BPF_OP(OP) | BPF_X, \ | |
163 | .dst_reg = DST, \ | |
164 | .src_reg = SRC, \ | |
165 | .off = OFF, \ | |
166 | .imm = 0 }) | |
167 | ||
168 | /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */ | |
169 | ||
170 | #define BPF_JMP_IMM(OP, DST, IMM, OFF) \ | |
171 | ((struct bpf_insn) { \ | |
172 | .code = BPF_JMP | BPF_OP(OP) | BPF_K, \ | |
173 | .dst_reg = DST, \ | |
174 | .src_reg = 0, \ | |
175 | .off = OFF, \ | |
176 | .imm = IMM }) | |
177 | ||
178 | /* Raw code statement block */ | |
179 | ||
180 | #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \ | |
181 | ((struct bpf_insn) { \ | |
182 | .code = CODE, \ | |
183 | .dst_reg = DST, \ | |
184 | .src_reg = SRC, \ | |
185 | .off = OFF, \ | |
186 | .imm = IMM }) | |
187 | ||
188 | /* Program exit */ | |
189 | ||
190 | #define BPF_EXIT_INSN() \ | |
191 | ((struct bpf_insn) { \ | |
192 | .code = BPF_JMP | BPF_EXIT, \ | |
193 | .dst_reg = 0, \ | |
194 | .src_reg = 0, \ | |
195 | .off = 0, \ | |
196 | .imm = 0 }) | |
197 | ||
198 | #endif |