projects / linux-seccomp.git / blame
| Commit | Line | Data |
|---|---|---|
| 8befd5cc MG |
1 | /** |
| 2 | * BPF Language Definitions | |
| 3 | * | |
| 4 | * Copyright (c) 2012 Red Hat <pmoore@redhat.com> | |
| 5 | * Author: Paul Moore <paul@paul-moore.com> | |
| 6 | */ | |
| 7 | ||
| 8 | /* | |
| 9 | * This library is free software; you can redistribute it and/or modify it | |
| 10 | * under the terms of version 2.1 of the GNU Lesser General Public License as | |
| 11 | * published by the Free Software Foundation. | |
| 12 | * | |
| 13 | * This library is distributed in the hope that it will be useful, but WITHOUT | |
| 14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
| 16 | * for more details. | |
| 17 | * | |
| 18 | * You should have received a copy of the GNU Lesser General Public License | |
| 19 | * along with this library; if not, see <http://www.gnu.org/licenses>. | |
| 20 | */ | |
| 21 | ||
| 22 | #ifndef _BPF_H | |
| 23 | #define _BPF_H | |
| 24 | ||
| 25 | #include <inttypes.h> | |
| 26 | #include <stddef.h> | |
| 27 | ||
| 28 | /* most of these structures and values are designed to match the Linux Kernel's | |
| 29 | * BPF interface (see /usr/include/linux/{filter,seccomp}.h), but we define our | |
| 30 | * own here so that we can function independent of the host OS */ | |
| 31 | ||
| 32 | /* XXX - need to verify these values */ | |
| 33 | #define BPF_SCRATCH_SIZE 6 | |
| 34 | ||
| 35 | /** | |
| 36 | * Syscall record data format used by seccomp | |
| 37 | */ | |
| 38 | #define BPF_SYS_ARG_MAX 6 | |
| 39 | struct seccomp_data { | |
| 40 | int32_t nr; | |
| 41 | uint32_t arch; | |
| 42 | uint64_t instruction_pointer; | |
| 43 | uint64_t args[BPF_SYS_ARG_MAX]; | |
| 44 | }; | |
| 45 | #define BPF_SYSCALL_MAX (sizeof(struct seccomp_data)) | |
| 46 | ||
| 47 | /** | |
| 48 | * BPF instruction format | |
| 49 | */ | |
| 50 | struct sock_filter { | |
| 51 | uint16_t code; | |
| 52 | uint8_t jt; | |
| 53 | uint8_t jf; | |
| 54 | uint32_t k; | |
| 55 | } __attribute__ ((packed)); | |
| 56 | typedef struct sock_filter bpf_instr_raw; | |
| 57 | ||
| 58 | /* seccomp return masks */ | |
| 59 | #define SECCOMP_RET_ACTION 0x7fff0000U | |
| 60 | #define SECCOMP_RET_DATA 0x0000ffffU | |
| 61 | ||
| 62 | /* seccomp action values */ | |
| 63 | #define SECCOMP_RET_KILL 0x00000000U | |
| 64 | #define SECCOMP_RET_TRAP 0x00030000U | |
| 65 | #define SECCOMP_RET_ERRNO 0x00050000U | |
| 66 | #define SECCOMP_RET_TRACE 0x7ff00000U | |
| 67 | #define SECCOMP_RET_ALLOW 0x7fff0000U | |
| 68 | ||
| 69 | /* bpf command classes */ | |
| 70 | #define BPF_CLASS(code) ((code) & 0x07) | |
| 71 | #define BPF_LD 0x00 | |
| 72 | #define BPF_LDX 0x01 | |
| 73 | #define BPF_ST 0x02 | |
| 74 | #define BPF_STX 0x03 | |
| 75 | #define BPF_ALU 0x04 | |
| 76 | #define BPF_JMP 0x05 | |
| 77 | #define BPF_RET 0x06 | |
| 78 | #define BPF_MISC 0x07 | |
| 79 | ||
| 80 | /* BPF_LD and BPF_LDX */ | |
| 81 | #define BPF_SIZE(code) ((code) & 0x18) | |
| 82 | #define BPF_W 0x00 | |
| 83 | #define BPF_H 0x08 | |
| 84 | #define BPF_B 0x10 | |
| 85 | #define BPF_MODE(code) ((code) & 0xe0) | |
| 86 | #define BPF_IMM 0x00 | |
| 87 | #define BPF_ABS 0x20 | |
| 88 | #define BPF_IND 0x40 | |
| 89 | #define BPF_MEM 0x60 | |
| 90 | #define BPF_LEN 0x80 | |
| 91 | #define BPF_MSH 0xa0 | |
| 92 | ||
| 93 | #define BPF_OP(code) ((code) & 0xf0) | |
| 94 | /* BPF_ALU */ | |
| 95 | #define BPF_ADD 0x00 | |
| 96 | #define BPF_SUB 0x10 | |
| 97 | #define BPF_MUL 0x20 | |
| 98 | #define BPF_DIV 0x30 | |
| 99 | #define BPF_OR 0x40 | |
| 100 | #define BPF_AND 0x50 | |
| 101 | #define BPF_LSH 0x60 | |
| 102 | #define BPF_RSH 0x70 | |
| 103 | #define BPF_NEG 0x80 | |
| 104 | /* BPF_JMP */ | |
| 105 | #define BPF_JA 0x00 | |
| 106 | #define BPF_JEQ 0x10 | |
| 107 | #define BPF_JGT 0x20 | |
| 108 | #define BPF_JGE 0x30 | |
| 109 | #define BPF_JSET 0x40 | |
| 110 | ||
| 111 | #define BPF_SRC(code) ((code) & 0x08) | |
| 112 | #define BPF_K 0x00 | |
| 113 | #define BPF_X 0x08 | |
| 114 | ||
| 115 | /* BPF_RET (BPF_K and BPF_X also apply) */ | |
| 116 | #define BPF_RVAL(code) ((code) & 0x18) | |
| 117 | #define BPF_A 0x10 | |
| 118 | ||
| 119 | /* BPF_MISC */ | |
| 120 | #define BPF_MISCOP(code) ((code) & 0xf8) | |
| 121 | #define BPF_TAX 0x00 | |
| 122 | #define BPF_TXA 0x80 | |
| 123 | ||
| 124 | #endif |