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, 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_obj_pin(int fd, const char *pathname); 19 int bpf_obj_get(const char *pathname); 20 21 #define LOG_BUF_SIZE 65536 22 extern 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' */ 196 int open_raw_sock(const char *name); 197 198 struct perf_event_attr; 199 int perf_event_open(struct perf_event_attr *attr, int pid, int cpu, 200 int group_fd, unsigned long flags); 201 #endif 202