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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 | /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. */ #ifndef _UAPI__LINUX_BPF_H__ #define _UAPI__LINUX_BPF_H__ #include <linux/types.h> #include <linux/bpf_common.h> /* Extended instruction set based on top of classic BPF */ /* instruction classes */ #define BPF_ALU64 0x07 /* alu mode in double word width */ /* ld/ldx fields */ #define BPF_DW 0x18 /* double word */ #define BPF_XADD 0xc0 /* exclusive add */ /* alu/jmp fields */ #define BPF_MOV 0xb0 /* mov reg to reg */ #define BPF_ARSH 0xc0 /* sign extending arithmetic shift right */ /* change endianness of a register */ #define BPF_END 0xd0 /* flags for endianness conversion: */ #define BPF_TO_LE 0x00 /* convert to little-endian */ #define BPF_TO_BE 0x08 /* convert to big-endian */ #define BPF_FROM_LE BPF_TO_LE #define BPF_FROM_BE BPF_TO_BE #define BPF_JNE 0x50 /* jump != */ #define BPF_JSGT 0x60 /* SGT is signed '>', GT in x86 */ #define BPF_JSGE 0x70 /* SGE is signed '>=', GE in x86 */ #define BPF_CALL 0x80 /* function call */ #define BPF_EXIT 0x90 /* function return */ /* Register numbers */ enum { BPF_REG_0 = 0, BPF_REG_1, BPF_REG_2, BPF_REG_3, BPF_REG_4, BPF_REG_5, BPF_REG_6, BPF_REG_7, BPF_REG_8, BPF_REG_9, BPF_REG_10, __MAX_BPF_REG, }; /* BPF has 10 general purpose 64-bit registers and stack frame. */ #define MAX_BPF_REG __MAX_BPF_REG struct bpf_insn { __u8 code; /* opcode */ __u8 dst_reg:4; /* dest register */ __u8 src_reg:4; /* source register */ __s16 off; /* signed offset */ __s32 imm; /* signed immediate constant */ }; /* BPF syscall commands */ enum bpf_cmd { /* create a map with given type and attributes * fd = bpf(BPF_MAP_CREATE, union bpf_attr *, u32 size) * returns fd or negative error * map is deleted when fd is closed */ BPF_MAP_CREATE, /* lookup key in a given map * err = bpf(BPF_MAP_LOOKUP_ELEM, union bpf_attr *attr, u32 size) * Using attr->map_fd, attr->key, attr->value * returns zero and stores found elem into value * or negative error */ BPF_MAP_LOOKUP_ELEM, /* create or update key/value pair in a given map * err = bpf(BPF_MAP_UPDATE_ELEM, union bpf_attr *attr, u32 size) * Using attr->map_fd, attr->key, attr->value * returns zero or negative error */ BPF_MAP_UPDATE_ELEM, /* find and delete elem by key in a given map * err = bpf(BPF_MAP_DELETE_ELEM, union bpf_attr *attr, u32 size) * Using attr->map_fd, attr->key * returns zero or negative error */ BPF_MAP_DELETE_ELEM, /* lookup key in a given map and return next key * err = bpf(BPF_MAP_GET_NEXT_KEY, union bpf_attr *attr, u32 size) * Using attr->map_fd, attr->key, attr->next_key * returns zero and stores next key or negative error */ BPF_MAP_GET_NEXT_KEY, /* verify and load eBPF program * prog_fd = bpf(BPF_PROG_LOAD, union bpf_attr *attr, u32 size) * Using attr->prog_type, attr->insns, attr->license * returns fd or negative error */ BPF_PROG_LOAD, }; enum bpf_map_type { BPF_MAP_TYPE_UNSPEC, }; enum bpf_prog_type { BPF_PROG_TYPE_UNSPEC, }; union bpf_attr { struct { /* anonymous struct used by BPF_MAP_CREATE command */ __u32 map_type; /* one of enum bpf_map_type */ __u32 key_size; /* size of key in bytes */ __u32 value_size; /* size of value in bytes */ __u32 max_entries; /* max number of entries in a map */ }; struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */ __u32 map_fd; __aligned_u64 key; union { __aligned_u64 value; __aligned_u64 next_key; }; }; struct { /* anonymous struct used by BPF_PROG_LOAD command */ __u32 prog_type; /* one of enum bpf_prog_type */ __u32 insn_cnt; __aligned_u64 insns; __aligned_u64 license; __u32 log_level; /* verbosity level of verifier */ __u32 log_size; /* size of user buffer */ __aligned_u64 log_buf; /* user supplied buffer */ }; } __attribute__((aligned(8))); /* integer value in 'imm' field of BPF_CALL instruction selects which helper * function eBPF program intends to call */ enum bpf_func_id { BPF_FUNC_unspec, __BPF_FUNC_MAX_ID, }; #endif /* _UAPI__LINUX_BPF_H__ */ |