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); 9 int bpf_update_elem(int fd, void *key, void *value); 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); 17 18 #define LOG_BUF_SIZE 8192 19 extern char bpf_log_buf[LOG_BUF_SIZE]; 20 21 /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */ 22 23 #define BPF_ALU64_REG(OP, DST, SRC) \ 24 ((struct bpf_insn) { \ 25 .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \ 26 .dst_reg = DST, \ 27 .src_reg = SRC, \ 28 .off = 0, \ 29 .imm = 0 }) 30 31 #define BPF_ALU32_REG(OP, DST, SRC) \ 32 ((struct bpf_insn) { \ 33 .code = BPF_ALU | BPF_OP(OP) | BPF_X, \ 34 .dst_reg = DST, \ 35 .src_reg = SRC, \ 36 .off = 0, \ 37 .imm = 0 }) 38 39 /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */ 40 41 #define BPF_ALU64_IMM(OP, DST, IMM) \ 42 ((struct bpf_insn) { \ 43 .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \ 44 .dst_reg = DST, \ 45 .src_reg = 0, \ 46 .off = 0, \ 47 .imm = IMM }) 48 49 #define BPF_ALU32_IMM(OP, DST, IMM) \ 50 ((struct bpf_insn) { \ 51 .code = BPF_ALU | BPF_OP(OP) | BPF_K, \ 52 .dst_reg = DST, \ 53 .src_reg = 0, \ 54 .off = 0, \ 55 .imm = IMM }) 56 57 /* Short form of mov, dst_reg = src_reg */ 58 59 #define BPF_MOV64_REG(DST, SRC) \ 60 ((struct bpf_insn) { \ 61 .code = BPF_ALU64 | BPF_MOV | BPF_X, \ 62 .dst_reg = DST, \ 63 .src_reg = SRC, \ 64 .off = 0, \ 65 .imm = 0 }) 66 67 /* Short form of mov, dst_reg = imm32 */ 68 69 #define BPF_MOV64_IMM(DST, IMM) \ 70 ((struct bpf_insn) { \ 71 .code = BPF_ALU64 | BPF_MOV | BPF_K, \ 72 .dst_reg = DST, \ 73 .src_reg = 0, \ 74 .off = 0, \ 75 .imm = IMM }) 76 77 /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */ 78 #define BPF_LD_IMM64(DST, IMM) \ 79 BPF_LD_IMM64_RAW(DST, 0, IMM) 80 81 #define BPF_LD_IMM64_RAW(DST, SRC, IMM) \ 82 ((struct bpf_insn) { \ 83 .code = BPF_LD | BPF_DW | BPF_IMM, \ 84 .dst_reg = DST, \ 85 .src_reg = SRC, \ 86 .off = 0, \ 87 .imm = (__u32) (IMM) }), \ 88 ((struct bpf_insn) { \ 89 .code = 0, /* zero is reserved opcode */ \ 90 .dst_reg = 0, \ 91 .src_reg = 0, \ 92 .off = 0, \ 93 .imm = ((__u64) (IMM)) >> 32 }) 94 95 #define BPF_PSEUDO_MAP_FD 1 96 97 /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */ 98 #define BPF_LD_MAP_FD(DST, MAP_FD) \ 99 BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD) 100 101 102 /* Memory load, dst_reg = *(uint *) (src_reg + off16) */ 103 104 #define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \ 105 ((struct bpf_insn) { \ 106 .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \ 107 .dst_reg = DST, \ 108 .src_reg = SRC, \ 109 .off = OFF, \ 110 .imm = 0 }) 111 112 /* Memory store, *(uint *) (dst_reg + off16) = src_reg */ 113 114 #define BPF_STX_MEM(SIZE, DST, SRC, OFF) \ 115 ((struct bpf_insn) { \ 116 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \ 117 .dst_reg = DST, \ 118 .src_reg = SRC, \ 119 .off = OFF, \ 120 .imm = 0 }) 121 122 /* Memory store, *(uint *) (dst_reg + off16) = imm32 */ 123 124 #define BPF_ST_MEM(SIZE, DST, OFF, IMM) \ 125 ((struct bpf_insn) { \ 126 .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \ 127 .dst_reg = DST, \ 128 .src_reg = 0, \ 129 .off = OFF, \ 130 .imm = IMM }) 131 132 /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */ 133 134 #define BPF_JMP_REG(OP, DST, SRC, OFF) \ 135 ((struct bpf_insn) { \ 136 .code = BPF_JMP | BPF_OP(OP) | BPF_X, \ 137 .dst_reg = DST, \ 138 .src_reg = SRC, \ 139 .off = OFF, \ 140 .imm = 0 }) 141 142 /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */ 143 144 #define BPF_JMP_IMM(OP, DST, IMM, OFF) \ 145 ((struct bpf_insn) { \ 146 .code = BPF_JMP | BPF_OP(OP) | BPF_K, \ 147 .dst_reg = DST, \ 148 .src_reg = 0, \ 149 .off = OFF, \ 150 .imm = IMM }) 151 152 /* Raw code statement block */ 153 154 #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \ 155 ((struct bpf_insn) { \ 156 .code = CODE, \ 157 .dst_reg = DST, \ 158 .src_reg = SRC, \ 159 .off = OFF, \ 160 .imm = IMM }) 161 162 /* Program exit */ 163 164 #define BPF_EXIT_INSN() \ 165 ((struct bpf_insn) { \ 166 .code = BPF_JMP | BPF_EXIT, \ 167 .dst_reg = 0, \ 168 .src_reg = 0, \ 169 .off = 0, \ 170 .imm = 0 }) 171 172 #endif 173