Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Linux Socket Filter Data Structures |
| 3 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | #ifndef __LINUX_FILTER_H__ |
| 5 | #define __LINUX_FILTER_H__ |
| 6 | |
Daniel Borkmann | b954d83 | 2014-09-10 15:01:02 +0200 | [diff] [blame] | 7 | #include <stdarg.h> |
| 8 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 9 | #include <linux/atomic.h> |
Will Drewry | 0c5fe1b | 2012-04-12 16:47:53 -0500 | [diff] [blame] | 10 | #include <linux/compat.h> |
Zi Shen Lim | 9f12fbe | 2014-07-03 07:56:54 -0700 | [diff] [blame] | 11 | #include <linux/skbuff.h> |
Daniel Borkmann | b954d83 | 2014-09-10 15:01:02 +0200 | [diff] [blame] | 12 | #include <linux/linkage.h> |
| 13 | #include <linux/printk.h> |
Alexei Starovoitov | d45ed4a | 2013-10-04 00:14:06 -0700 | [diff] [blame] | 14 | #include <linux/workqueue.h> |
Daniel Borkmann | b13138e | 2015-07-30 12:42:49 +0200 | [diff] [blame] | 15 | #include <linux/sched.h> |
Daniel Borkmann | 4f3446b | 2016-05-13 19:08:32 +0200 | [diff] [blame] | 16 | #include <linux/capability.h> |
| 17 | |
Alexei Starovoitov | ff936a0 | 2015-10-07 10:55:41 -0700 | [diff] [blame] | 18 | #include <net/sch_generic.h> |
Daniel Borkmann | b954d83 | 2014-09-10 15:01:02 +0200 | [diff] [blame] | 19 | |
Daniel Borkmann | 60a3b22 | 2014-09-02 22:53:44 +0200 | [diff] [blame] | 20 | #include <asm/cacheflush.h> |
Daniel Borkmann | b954d83 | 2014-09-10 15:01:02 +0200 | [diff] [blame] | 21 | |
| 22 | #include <uapi/linux/filter.h> |
Alexei Starovoitov | daedfb2 | 2014-09-04 22:17:18 -0700 | [diff] [blame] | 23 | #include <uapi/linux/bpf.h> |
Daniel Borkmann | 60a3b22 | 2014-09-02 22:53:44 +0200 | [diff] [blame] | 24 | |
| 25 | struct sk_buff; |
| 26 | struct sock; |
| 27 | struct seccomp_data; |
Alexei Starovoitov | 09756af | 2014-09-26 00:17:00 -0700 | [diff] [blame] | 28 | struct bpf_prog_aux; |
Heiko Carstens | 792d4b5 | 2011-05-22 07:08:11 +0000 | [diff] [blame] | 29 | |
Daniel Borkmann | 3074383 | 2014-05-01 18:34:19 +0200 | [diff] [blame] | 30 | /* ArgX, context and stack frame pointer register positions. Note, |
| 31 | * Arg1, Arg2, Arg3, etc are used as argument mappings of function |
| 32 | * calls in BPF_CALL instruction. |
| 33 | */ |
| 34 | #define BPF_REG_ARG1 BPF_REG_1 |
| 35 | #define BPF_REG_ARG2 BPF_REG_2 |
| 36 | #define BPF_REG_ARG3 BPF_REG_3 |
| 37 | #define BPF_REG_ARG4 BPF_REG_4 |
| 38 | #define BPF_REG_ARG5 BPF_REG_5 |
| 39 | #define BPF_REG_CTX BPF_REG_6 |
| 40 | #define BPF_REG_FP BPF_REG_10 |
| 41 | |
| 42 | /* Additional register mappings for converted user programs. */ |
| 43 | #define BPF_REG_A BPF_REG_0 |
| 44 | #define BPF_REG_X BPF_REG_7 |
| 45 | #define BPF_REG_TMP BPF_REG_8 |
Alexei Starovoitov | bd4cf0e | 2014-03-28 18:58:25 +0100 | [diff] [blame] | 46 | |
Daniel Borkmann | 4f3446b | 2016-05-13 19:08:32 +0200 | [diff] [blame] | 47 | /* Kernel hidden auxiliary/helper register for hardening step. |
| 48 | * Only used by eBPF JITs. It's nothing more than a temporary |
| 49 | * register that JITs use internally, only that here it's part |
| 50 | * of eBPF instructions that have been rewritten for blinding |
| 51 | * constants. See JIT pre-step in bpf_jit_blind_constants(). |
| 52 | */ |
| 53 | #define BPF_REG_AX MAX_BPF_REG |
| 54 | #define MAX_BPF_JIT_REG (MAX_BPF_REG + 1) |
| 55 | |
Alexei Starovoitov | bd4cf0e | 2014-03-28 18:58:25 +0100 | [diff] [blame] | 56 | /* BPF program can access up to 512 bytes of stack space. */ |
| 57 | #define MAX_BPF_STACK 512 |
| 58 | |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 59 | /* Helper macros for filter block array initializers. */ |
Alexei Starovoitov | 9739eef | 2014-05-08 14:10:51 -0700 | [diff] [blame] | 60 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 61 | /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */ |
Alexei Starovoitov | 9739eef | 2014-05-08 14:10:51 -0700 | [diff] [blame] | 62 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 63 | #define BPF_ALU64_REG(OP, DST, SRC) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 64 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 65 | .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 66 | .dst_reg = DST, \ |
| 67 | .src_reg = SRC, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 68 | .off = 0, \ |
| 69 | .imm = 0 }) |
Alexei Starovoitov | 9739eef | 2014-05-08 14:10:51 -0700 | [diff] [blame] | 70 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 71 | #define BPF_ALU32_REG(OP, DST, SRC) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 72 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 73 | .code = BPF_ALU | BPF_OP(OP) | BPF_X, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 74 | .dst_reg = DST, \ |
| 75 | .src_reg = SRC, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 76 | .off = 0, \ |
| 77 | .imm = 0 }) |
Alexei Starovoitov | 9739eef | 2014-05-08 14:10:51 -0700 | [diff] [blame] | 78 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 79 | /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */ |
Alexei Starovoitov | 9739eef | 2014-05-08 14:10:51 -0700 | [diff] [blame] | 80 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 81 | #define BPF_ALU64_IMM(OP, DST, IMM) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 82 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 83 | .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 84 | .dst_reg = DST, \ |
| 85 | .src_reg = 0, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 86 | .off = 0, \ |
| 87 | .imm = IMM }) |
Alexei Starovoitov | 9739eef | 2014-05-08 14:10:51 -0700 | [diff] [blame] | 88 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 89 | #define BPF_ALU32_IMM(OP, DST, IMM) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 90 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 91 | .code = BPF_ALU | BPF_OP(OP) | BPF_K, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 92 | .dst_reg = DST, \ |
| 93 | .src_reg = 0, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 94 | .off = 0, \ |
| 95 | .imm = IMM }) |
Alexei Starovoitov | 9739eef | 2014-05-08 14:10:51 -0700 | [diff] [blame] | 96 | |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 97 | /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */ |
Alexei Starovoitov | 9739eef | 2014-05-08 14:10:51 -0700 | [diff] [blame] | 98 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 99 | #define BPF_ENDIAN(TYPE, DST, LEN) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 100 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 101 | .code = BPF_ALU | BPF_END | BPF_SRC(TYPE), \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 102 | .dst_reg = DST, \ |
| 103 | .src_reg = 0, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 104 | .off = 0, \ |
| 105 | .imm = LEN }) |
| 106 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 107 | /* Short form of mov, dst_reg = src_reg */ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 108 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 109 | #define BPF_MOV64_REG(DST, SRC) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 110 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 111 | .code = BPF_ALU64 | BPF_MOV | BPF_X, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 112 | .dst_reg = DST, \ |
| 113 | .src_reg = SRC, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 114 | .off = 0, \ |
| 115 | .imm = 0 }) |
| 116 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 117 | #define BPF_MOV32_REG(DST, SRC) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 118 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 119 | .code = BPF_ALU | BPF_MOV | BPF_X, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 120 | .dst_reg = DST, \ |
| 121 | .src_reg = SRC, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 122 | .off = 0, \ |
| 123 | .imm = 0 }) |
| 124 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 125 | /* Short form of mov, dst_reg = imm32 */ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 126 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 127 | #define BPF_MOV64_IMM(DST, IMM) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 128 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 129 | .code = BPF_ALU64 | BPF_MOV | BPF_K, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 130 | .dst_reg = DST, \ |
| 131 | .src_reg = 0, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 132 | .off = 0, \ |
| 133 | .imm = IMM }) |
| 134 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 135 | #define BPF_MOV32_IMM(DST, IMM) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 136 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 137 | .code = BPF_ALU | BPF_MOV | BPF_K, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 138 | .dst_reg = DST, \ |
| 139 | .src_reg = 0, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 140 | .off = 0, \ |
| 141 | .imm = IMM }) |
| 142 | |
Alexei Starovoitov | 02ab695 | 2014-09-04 22:17:17 -0700 | [diff] [blame] | 143 | /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */ |
| 144 | #define BPF_LD_IMM64(DST, IMM) \ |
| 145 | BPF_LD_IMM64_RAW(DST, 0, IMM) |
| 146 | |
| 147 | #define BPF_LD_IMM64_RAW(DST, SRC, IMM) \ |
| 148 | ((struct bpf_insn) { \ |
| 149 | .code = BPF_LD | BPF_DW | BPF_IMM, \ |
| 150 | .dst_reg = DST, \ |
| 151 | .src_reg = SRC, \ |
| 152 | .off = 0, \ |
| 153 | .imm = (__u32) (IMM) }), \ |
| 154 | ((struct bpf_insn) { \ |
| 155 | .code = 0, /* zero is reserved opcode */ \ |
| 156 | .dst_reg = 0, \ |
| 157 | .src_reg = 0, \ |
| 158 | .off = 0, \ |
| 159 | .imm = ((__u64) (IMM)) >> 32 }) |
| 160 | |
Alexei Starovoitov | 0246e64 | 2014-09-26 00:17:04 -0700 | [diff] [blame] | 161 | /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */ |
| 162 | #define BPF_LD_MAP_FD(DST, MAP_FD) \ |
| 163 | BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD) |
| 164 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 165 | /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 166 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 167 | #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 168 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 169 | .code = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE), \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 170 | .dst_reg = DST, \ |
| 171 | .src_reg = SRC, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 172 | .off = 0, \ |
| 173 | .imm = IMM }) |
| 174 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 175 | #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 176 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 177 | .code = BPF_ALU | BPF_MOV | BPF_SRC(TYPE), \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 178 | .dst_reg = DST, \ |
| 179 | .src_reg = SRC, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 180 | .off = 0, \ |
| 181 | .imm = IMM }) |
| 182 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 183 | /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 184 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 185 | #define BPF_LD_ABS(SIZE, IMM) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 186 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 187 | .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 188 | .dst_reg = 0, \ |
| 189 | .src_reg = 0, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 190 | .off = 0, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 191 | .imm = IMM }) |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 192 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 193 | /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 194 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 195 | #define BPF_LD_IND(SIZE, SRC, IMM) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 196 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 197 | .code = BPF_LD | BPF_SIZE(SIZE) | BPF_IND, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 198 | .dst_reg = 0, \ |
| 199 | .src_reg = SRC, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 200 | .off = 0, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 201 | .imm = IMM }) |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 202 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 203 | /* Memory load, dst_reg = *(uint *) (src_reg + off16) */ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 204 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 205 | #define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 206 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 207 | .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 208 | .dst_reg = DST, \ |
| 209 | .src_reg = SRC, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 210 | .off = OFF, \ |
| 211 | .imm = 0 }) |
| 212 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 213 | /* Memory store, *(uint *) (dst_reg + off16) = src_reg */ |
| 214 | |
| 215 | #define BPF_STX_MEM(SIZE, DST, SRC, OFF) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 216 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 217 | .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 218 | .dst_reg = DST, \ |
| 219 | .src_reg = SRC, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 220 | .off = OFF, \ |
| 221 | .imm = 0 }) |
| 222 | |
Michael Holzheu | cffc642 | 2015-05-11 22:22:44 -0700 | [diff] [blame] | 223 | /* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */ |
| 224 | |
| 225 | #define BPF_STX_XADD(SIZE, DST, SRC, OFF) \ |
| 226 | ((struct bpf_insn) { \ |
| 227 | .code = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD, \ |
| 228 | .dst_reg = DST, \ |
| 229 | .src_reg = SRC, \ |
| 230 | .off = OFF, \ |
| 231 | .imm = 0 }) |
| 232 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 233 | /* Memory store, *(uint *) (dst_reg + off16) = imm32 */ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 234 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 235 | #define BPF_ST_MEM(SIZE, DST, OFF, IMM) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 236 | ((struct bpf_insn) { \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 237 | .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \ |
| 238 | .dst_reg = DST, \ |
| 239 | .src_reg = 0, \ |
| 240 | .off = OFF, \ |
| 241 | .imm = IMM }) |
| 242 | |
| 243 | /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */ |
| 244 | |
| 245 | #define BPF_JMP_REG(OP, DST, SRC, OFF) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 246 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 247 | .code = BPF_JMP | BPF_OP(OP) | BPF_X, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 248 | .dst_reg = DST, \ |
| 249 | .src_reg = SRC, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 250 | .off = OFF, \ |
| 251 | .imm = 0 }) |
| 252 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 253 | /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 254 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 255 | #define BPF_JMP_IMM(OP, DST, IMM, OFF) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 256 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 257 | .code = BPF_JMP | BPF_OP(OP) | BPF_K, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 258 | .dst_reg = DST, \ |
| 259 | .src_reg = 0, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 260 | .off = OFF, \ |
| 261 | .imm = IMM }) |
| 262 | |
| 263 | /* Function call */ |
| 264 | |
| 265 | #define BPF_EMIT_CALL(FUNC) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 266 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 267 | .code = BPF_JMP | BPF_CALL, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 268 | .dst_reg = 0, \ |
| 269 | .src_reg = 0, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 270 | .off = 0, \ |
| 271 | .imm = ((FUNC) - __bpf_call_base) }) |
| 272 | |
| 273 | /* Raw code statement block */ |
| 274 | |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 275 | #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 276 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 277 | .code = CODE, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 278 | .dst_reg = DST, \ |
| 279 | .src_reg = SRC, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 280 | .off = OFF, \ |
| 281 | .imm = IMM }) |
| 282 | |
| 283 | /* Program exit */ |
| 284 | |
| 285 | #define BPF_EXIT_INSN() \ |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 286 | ((struct bpf_insn) { \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 287 | .code = BPF_JMP | BPF_EXIT, \ |
Alexei Starovoitov | e430f34 | 2014-06-06 14:46:06 -0700 | [diff] [blame] | 288 | .dst_reg = 0, \ |
| 289 | .src_reg = 0, \ |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 290 | .off = 0, \ |
| 291 | .imm = 0 }) |
| 292 | |
Daniel Borkmann | a4afd37b | 2015-05-13 13:12:43 +0200 | [diff] [blame] | 293 | /* Internal classic blocks for direct assignment */ |
| 294 | |
| 295 | #define __BPF_STMT(CODE, K) \ |
| 296 | ((struct sock_filter) BPF_STMT(CODE, K)) |
| 297 | |
| 298 | #define __BPF_JUMP(CODE, K, JT, JF) \ |
| 299 | ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF)) |
| 300 | |
Daniel Borkmann | f8f6d67 | 2014-05-29 10:22:51 +0200 | [diff] [blame] | 301 | #define bytes_to_bpf_size(bytes) \ |
| 302 | ({ \ |
| 303 | int bpf_size = -EINVAL; \ |
| 304 | \ |
| 305 | if (bytes == sizeof(u8)) \ |
| 306 | bpf_size = BPF_B; \ |
| 307 | else if (bytes == sizeof(u16)) \ |
| 308 | bpf_size = BPF_H; \ |
| 309 | else if (bytes == sizeof(u32)) \ |
| 310 | bpf_size = BPF_W; \ |
| 311 | else if (bytes == sizeof(u64)) \ |
| 312 | bpf_size = BPF_DW; \ |
| 313 | \ |
| 314 | bpf_size; \ |
| 315 | }) |
Alexei Starovoitov | 9739eef | 2014-05-08 14:10:51 -0700 | [diff] [blame] | 316 | |
Daniel Borkmann | f035a51 | 2016-09-09 02:45:29 +0200 | [diff] [blame] | 317 | #define BPF_SIZEOF(type) \ |
| 318 | ({ \ |
| 319 | const int __size = bytes_to_bpf_size(sizeof(type)); \ |
| 320 | BUILD_BUG_ON(__size < 0); \ |
| 321 | __size; \ |
| 322 | }) |
| 323 | |
| 324 | #define BPF_FIELD_SIZEOF(type, field) \ |
| 325 | ({ \ |
| 326 | const int __size = bytes_to_bpf_size(FIELD_SIZEOF(type, field)); \ |
| 327 | BUILD_BUG_ON(__size < 0); \ |
| 328 | __size; \ |
| 329 | }) |
| 330 | |
Daniel Borkmann | f3694e0 | 2016-09-09 02:45:31 +0200 | [diff] [blame] | 331 | #define __BPF_MAP_0(m, v, ...) v |
| 332 | #define __BPF_MAP_1(m, v, t, a, ...) m(t, a) |
| 333 | #define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__) |
| 334 | #define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__) |
| 335 | #define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__) |
| 336 | #define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__) |
| 337 | |
| 338 | #define __BPF_REG_0(...) __BPF_PAD(5) |
| 339 | #define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4) |
| 340 | #define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3) |
| 341 | #define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2) |
| 342 | #define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1) |
| 343 | #define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__) |
| 344 | |
| 345 | #define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__) |
| 346 | #define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__) |
| 347 | |
| 348 | #define __BPF_CAST(t, a) \ |
| 349 | (__force t) \ |
| 350 | (__force \ |
| 351 | typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long), \ |
| 352 | (unsigned long)0, (t)0))) a |
| 353 | #define __BPF_V void |
| 354 | #define __BPF_N |
| 355 | |
| 356 | #define __BPF_DECL_ARGS(t, a) t a |
| 357 | #define __BPF_DECL_REGS(t, a) u64 a |
| 358 | |
| 359 | #define __BPF_PAD(n) \ |
| 360 | __BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2, \ |
| 361 | u64, __ur_3, u64, __ur_4, u64, __ur_5) |
| 362 | |
| 363 | #define BPF_CALL_x(x, name, ...) \ |
| 364 | static __always_inline \ |
| 365 | u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)); \ |
| 366 | u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)); \ |
| 367 | u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__)) \ |
| 368 | { \ |
| 369 | return ____##name(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\ |
| 370 | } \ |
| 371 | static __always_inline \ |
| 372 | u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)) |
| 373 | |
| 374 | #define BPF_CALL_0(name, ...) BPF_CALL_x(0, name, __VA_ARGS__) |
| 375 | #define BPF_CALL_1(name, ...) BPF_CALL_x(1, name, __VA_ARGS__) |
| 376 | #define BPF_CALL_2(name, ...) BPF_CALL_x(2, name, __VA_ARGS__) |
| 377 | #define BPF_CALL_3(name, ...) BPF_CALL_x(3, name, __VA_ARGS__) |
| 378 | #define BPF_CALL_4(name, ...) BPF_CALL_x(4, name, __VA_ARGS__) |
| 379 | #define BPF_CALL_5(name, ...) BPF_CALL_x(5, name, __VA_ARGS__) |
| 380 | |
Alexei Starovoitov | bd4cf0e | 2014-03-28 18:58:25 +0100 | [diff] [blame] | 381 | #ifdef CONFIG_COMPAT |
| 382 | /* A struct sock_filter is architecture independent. */ |
Will Drewry | 0c5fe1b | 2012-04-12 16:47:53 -0500 | [diff] [blame] | 383 | struct compat_sock_fprog { |
| 384 | u16 len; |
Alexei Starovoitov | bd4cf0e | 2014-03-28 18:58:25 +0100 | [diff] [blame] | 385 | compat_uptr_t filter; /* struct sock_filter * */ |
Will Drewry | 0c5fe1b | 2012-04-12 16:47:53 -0500 | [diff] [blame] | 386 | }; |
| 387 | #endif |
| 388 | |
Daniel Borkmann | a3ea269 | 2014-03-28 18:58:19 +0100 | [diff] [blame] | 389 | struct sock_fprog_kern { |
| 390 | u16 len; |
| 391 | struct sock_filter *filter; |
| 392 | }; |
| 393 | |
Daniel Borkmann | 738cbe7 | 2014-09-08 08:04:47 +0200 | [diff] [blame] | 394 | struct bpf_binary_header { |
| 395 | unsigned int pages; |
| 396 | u8 image[]; |
| 397 | }; |
| 398 | |
Alexei Starovoitov | 7ae457c | 2014-07-30 20:34:16 -0700 | [diff] [blame] | 399 | struct bpf_prog { |
Daniel Borkmann | 286aad3 | 2014-09-08 08:04:49 +0200 | [diff] [blame] | 400 | u16 pages; /* Number of allocated pages */ |
Daniel Borkmann | a91263d | 2015-09-30 01:41:50 +0200 | [diff] [blame] | 401 | kmemcheck_bitfield_begin(meta); |
| 402 | u16 jited:1, /* Is our filter JIT'ed? */ |
Daniel Borkmann | c46646d | 2015-09-30 01:41:51 +0200 | [diff] [blame] | 403 | gpl_compatible:1, /* Is filter GPL compatible? */ |
Alexei Starovoitov | ff936a0 | 2015-10-07 10:55:41 -0700 | [diff] [blame] | 404 | cb_access:1, /* Is control block accessed? */ |
Daniel Borkmann | c46646d | 2015-09-30 01:41:51 +0200 | [diff] [blame] | 405 | dst_needed:1; /* Do we need dst entry? */ |
Daniel Borkmann | a91263d | 2015-09-30 01:41:50 +0200 | [diff] [blame] | 406 | kmemcheck_bitfield_end(meta); |
Daniel Borkmann | 286aad3 | 2014-09-08 08:04:49 +0200 | [diff] [blame] | 407 | u32 len; /* Number of filter blocks */ |
Daniel Borkmann | 24701ec | 2015-03-01 12:31:47 +0100 | [diff] [blame] | 408 | enum bpf_prog_type type; /* Type of BPF program */ |
Alexei Starovoitov | 09756af | 2014-09-26 00:17:00 -0700 | [diff] [blame] | 409 | struct bpf_prog_aux *aux; /* Auxiliary fields */ |
Daniel Borkmann | 24701ec | 2015-03-01 12:31:47 +0100 | [diff] [blame] | 410 | struct sock_fprog_kern *orig_prog; /* Original BPF program */ |
Eric Dumazet | 0a14842 | 2011-04-20 09:27:32 +0000 | [diff] [blame] | 411 | unsigned int (*bpf_func)(const struct sk_buff *skb, |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 412 | const struct bpf_insn *filter); |
Daniel Borkmann | 60a3b22 | 2014-09-02 22:53:44 +0200 | [diff] [blame] | 413 | /* Instructions for interpreter */ |
Alexei Starovoitov | d45ed4a | 2013-10-04 00:14:06 -0700 | [diff] [blame] | 414 | union { |
Alexei Starovoitov | bd4cf0e | 2014-03-28 18:58:25 +0100 | [diff] [blame] | 415 | struct sock_filter insns[0]; |
Alexei Starovoitov | 2695fb5 | 2014-07-24 16:38:21 -0700 | [diff] [blame] | 416 | struct bpf_insn insnsi[0]; |
Alexei Starovoitov | d45ed4a | 2013-10-04 00:14:06 -0700 | [diff] [blame] | 417 | }; |
Stephen Hemminger | b715631 | 2008-04-10 01:33:47 -0700 | [diff] [blame] | 418 | }; |
| 419 | |
Alexei Starovoitov | 7ae457c | 2014-07-30 20:34:16 -0700 | [diff] [blame] | 420 | struct sk_filter { |
| 421 | atomic_t refcnt; |
| 422 | struct rcu_head rcu; |
| 423 | struct bpf_prog *prog; |
| 424 | }; |
| 425 | |
| 426 | #define BPF_PROG_RUN(filter, ctx) (*filter->bpf_func)(ctx, filter->insnsi) |
| 427 | |
Daniel Borkmann | 01dd194 | 2016-01-06 22:32:16 +0100 | [diff] [blame] | 428 | #define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN |
| 429 | |
Alexei Starovoitov | db58ba4 | 2016-05-05 19:49:12 -0700 | [diff] [blame] | 430 | struct bpf_skb_data_end { |
| 431 | struct qdisc_skb_cb qdisc_cb; |
| 432 | void *data_end; |
| 433 | }; |
| 434 | |
Brenden Blanco | 6a773a1 | 2016-07-19 12:16:47 -0700 | [diff] [blame] | 435 | struct xdp_buff { |
| 436 | void *data; |
| 437 | void *data_end; |
| 438 | }; |
| 439 | |
Alexei Starovoitov | db58ba4 | 2016-05-05 19:49:12 -0700 | [diff] [blame] | 440 | /* compute the linear packet data range [data, data_end) which |
| 441 | * will be accessed by cls_bpf and act_bpf programs |
| 442 | */ |
| 443 | static inline void bpf_compute_data_end(struct sk_buff *skb) |
| 444 | { |
| 445 | struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb; |
| 446 | |
| 447 | BUILD_BUG_ON(sizeof(*cb) > FIELD_SIZEOF(struct sk_buff, cb)); |
| 448 | cb->data_end = skb->data + skb_headlen(skb); |
| 449 | } |
| 450 | |
Daniel Borkmann | 01dd194 | 2016-01-06 22:32:16 +0100 | [diff] [blame] | 451 | static inline u8 *bpf_skb_cb(struct sk_buff *skb) |
| 452 | { |
| 453 | /* eBPF programs may read/write skb->cb[] area to transfer meta |
| 454 | * data between tail calls. Since this also needs to work with |
| 455 | * tc, that scratch memory is mapped to qdisc_skb_cb's data area. |
| 456 | * |
| 457 | * In some socket filter cases, the cb unfortunately needs to be |
| 458 | * saved/restored so that protocol specific skb->cb[] data won't |
| 459 | * be lost. In any case, due to unpriviledged eBPF programs |
| 460 | * attached to sockets, we need to clear the bpf_skb_cb() area |
| 461 | * to not leak previous contents to user space. |
| 462 | */ |
| 463 | BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != BPF_SKB_CB_LEN); |
| 464 | BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != |
| 465 | FIELD_SIZEOF(struct qdisc_skb_cb, data)); |
| 466 | |
| 467 | return qdisc_skb_cb(skb)->data; |
| 468 | } |
| 469 | |
Alexei Starovoitov | ff936a0 | 2015-10-07 10:55:41 -0700 | [diff] [blame] | 470 | static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog, |
| 471 | struct sk_buff *skb) |
| 472 | { |
Daniel Borkmann | 01dd194 | 2016-01-06 22:32:16 +0100 | [diff] [blame] | 473 | u8 *cb_data = bpf_skb_cb(skb); |
| 474 | u8 cb_saved[BPF_SKB_CB_LEN]; |
Alexei Starovoitov | ff936a0 | 2015-10-07 10:55:41 -0700 | [diff] [blame] | 475 | u32 res; |
| 476 | |
Alexei Starovoitov | ff936a0 | 2015-10-07 10:55:41 -0700 | [diff] [blame] | 477 | if (unlikely(prog->cb_access)) { |
Daniel Borkmann | 01dd194 | 2016-01-06 22:32:16 +0100 | [diff] [blame] | 478 | memcpy(cb_saved, cb_data, sizeof(cb_saved)); |
| 479 | memset(cb_data, 0, sizeof(cb_saved)); |
Alexei Starovoitov | ff936a0 | 2015-10-07 10:55:41 -0700 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | res = BPF_PROG_RUN(prog, skb); |
| 483 | |
| 484 | if (unlikely(prog->cb_access)) |
Daniel Borkmann | 01dd194 | 2016-01-06 22:32:16 +0100 | [diff] [blame] | 485 | memcpy(cb_data, cb_saved, sizeof(cb_saved)); |
Alexei Starovoitov | ff936a0 | 2015-10-07 10:55:41 -0700 | [diff] [blame] | 486 | |
| 487 | return res; |
| 488 | } |
| 489 | |
| 490 | static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog, |
| 491 | struct sk_buff *skb) |
| 492 | { |
Daniel Borkmann | 01dd194 | 2016-01-06 22:32:16 +0100 | [diff] [blame] | 493 | u8 *cb_data = bpf_skb_cb(skb); |
Alexei Starovoitov | ff936a0 | 2015-10-07 10:55:41 -0700 | [diff] [blame] | 494 | |
| 495 | if (unlikely(prog->cb_access)) |
Daniel Borkmann | 01dd194 | 2016-01-06 22:32:16 +0100 | [diff] [blame] | 496 | memset(cb_data, 0, BPF_SKB_CB_LEN); |
| 497 | |
Alexei Starovoitov | ff936a0 | 2015-10-07 10:55:41 -0700 | [diff] [blame] | 498 | return BPF_PROG_RUN(prog, skb); |
| 499 | } |
| 500 | |
Brenden Blanco | 6a773a1 | 2016-07-19 12:16:47 -0700 | [diff] [blame] | 501 | static inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog, |
| 502 | struct xdp_buff *xdp) |
| 503 | { |
| 504 | u32 ret; |
| 505 | |
| 506 | rcu_read_lock(); |
| 507 | ret = BPF_PROG_RUN(prog, (void *)xdp); |
| 508 | rcu_read_unlock(); |
| 509 | |
| 510 | return ret; |
| 511 | } |
| 512 | |
Alexei Starovoitov | 7ae457c | 2014-07-30 20:34:16 -0700 | [diff] [blame] | 513 | static inline unsigned int bpf_prog_size(unsigned int proglen) |
Stephen Hemminger | b715631 | 2008-04-10 01:33:47 -0700 | [diff] [blame] | 514 | { |
Alexei Starovoitov | 7ae457c | 2014-07-30 20:34:16 -0700 | [diff] [blame] | 515 | return max(sizeof(struct bpf_prog), |
| 516 | offsetof(struct bpf_prog, insns[proglen])); |
Stephen Hemminger | b715631 | 2008-04-10 01:33:47 -0700 | [diff] [blame] | 517 | } |
| 518 | |
Daniel Borkmann | 7b36f92 | 2015-07-30 12:42:47 +0200 | [diff] [blame] | 519 | static inline bool bpf_prog_was_classic(const struct bpf_prog *prog) |
| 520 | { |
| 521 | /* When classic BPF programs have been loaded and the arch |
| 522 | * does not have a classic BPF JIT (anymore), they have been |
| 523 | * converted via bpf_migrate_filter() to eBPF and thus always |
| 524 | * have an unspec program type. |
| 525 | */ |
| 526 | return prog->type == BPF_PROG_TYPE_UNSPEC; |
| 527 | } |
| 528 | |
Alexei Starovoitov | 009937e | 2014-07-30 20:34:13 -0700 | [diff] [blame] | 529 | #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0])) |
Daniel Borkmann | a3ea269 | 2014-03-28 18:58:19 +0100 | [diff] [blame] | 530 | |
Daniel Borkmann | 60a3b22 | 2014-09-02 22:53:44 +0200 | [diff] [blame] | 531 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
| 532 | static inline void bpf_prog_lock_ro(struct bpf_prog *fp) |
| 533 | { |
| 534 | set_memory_ro((unsigned long)fp, fp->pages); |
| 535 | } |
| 536 | |
| 537 | static inline void bpf_prog_unlock_ro(struct bpf_prog *fp) |
| 538 | { |
| 539 | set_memory_rw((unsigned long)fp, fp->pages); |
| 540 | } |
| 541 | #else |
| 542 | static inline void bpf_prog_lock_ro(struct bpf_prog *fp) |
| 543 | { |
| 544 | } |
| 545 | |
| 546 | static inline void bpf_prog_unlock_ro(struct bpf_prog *fp) |
| 547 | { |
| 548 | } |
| 549 | #endif /* CONFIG_DEBUG_SET_MODULE_RONX */ |
| 550 | |
Willem de Bruijn | f4979fc | 2016-07-12 18:18:56 -0400 | [diff] [blame] | 551 | int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap); |
| 552 | static inline int sk_filter(struct sock *sk, struct sk_buff *skb) |
| 553 | { |
| 554 | return sk_filter_trim_cap(sk, skb, 1); |
| 555 | } |
Alexei Starovoitov | bd4cf0e | 2014-03-28 18:58:25 +0100 | [diff] [blame] | 556 | |
Daniel Borkmann | d1c55ab | 2016-05-13 19:08:31 +0200 | [diff] [blame] | 557 | struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err); |
Alexei Starovoitov | 7ae457c | 2014-07-30 20:34:16 -0700 | [diff] [blame] | 558 | void bpf_prog_free(struct bpf_prog *fp); |
Alexei Starovoitov | bd4cf0e | 2014-03-28 18:58:25 +0100 | [diff] [blame] | 559 | |
Daniel Borkmann | 60a3b22 | 2014-09-02 22:53:44 +0200 | [diff] [blame] | 560 | struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags); |
| 561 | struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size, |
| 562 | gfp_t gfp_extra_flags); |
| 563 | void __bpf_prog_free(struct bpf_prog *fp); |
| 564 | |
| 565 | static inline void bpf_prog_unlock_free(struct bpf_prog *fp) |
| 566 | { |
| 567 | bpf_prog_unlock_ro(fp); |
| 568 | __bpf_prog_free(fp); |
| 569 | } |
| 570 | |
Daniel Borkmann | ac67eb2 | 2015-05-06 16:12:30 +0200 | [diff] [blame] | 571 | typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter, |
| 572 | unsigned int flen); |
| 573 | |
Alexei Starovoitov | 7ae457c | 2014-07-30 20:34:16 -0700 | [diff] [blame] | 574 | int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog); |
Daniel Borkmann | ac67eb2 | 2015-05-06 16:12:30 +0200 | [diff] [blame] | 575 | int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, |
Daniel Borkmann | bab1899 | 2015-10-02 15:17:33 +0200 | [diff] [blame] | 576 | bpf_aux_classic_check_t trans, bool save_orig); |
Alexei Starovoitov | 7ae457c | 2014-07-30 20:34:16 -0700 | [diff] [blame] | 577 | void bpf_prog_destroy(struct bpf_prog *fp); |
Daniel Borkmann | a3ea269 | 2014-03-28 18:58:19 +0100 | [diff] [blame] | 578 | |
Daniel Borkmann | fbc907f | 2014-03-28 18:58:20 +0100 | [diff] [blame] | 579 | int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk); |
Alexei Starovoitov | 89aa075 | 2014-12-01 15:06:35 -0800 | [diff] [blame] | 580 | int sk_attach_bpf(u32 ufd, struct sock *sk); |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 581 | int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk); |
| 582 | int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk); |
Daniel Borkmann | fbc907f | 2014-03-28 18:58:20 +0100 | [diff] [blame] | 583 | int sk_detach_filter(struct sock *sk); |
Daniel Borkmann | fbc907f | 2014-03-28 18:58:20 +0100 | [diff] [blame] | 584 | int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, |
| 585 | unsigned int len); |
Daniel Borkmann | fbc907f | 2014-03-28 18:58:20 +0100 | [diff] [blame] | 586 | |
Alexei Starovoitov | 278571b | 2014-07-30 20:34:12 -0700 | [diff] [blame] | 587 | bool sk_filter_charge(struct sock *sk, struct sk_filter *fp); |
Daniel Borkmann | fbc907f | 2014-03-28 18:58:20 +0100 | [diff] [blame] | 588 | void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp); |
Eric Dumazet | 0a14842 | 2011-04-20 09:27:32 +0000 | [diff] [blame] | 589 | |
Alexei Starovoitov | 6225827 | 2014-05-13 19:50:46 -0700 | [diff] [blame] | 590 | u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); |
Daniel Borkmann | d1c55ab | 2016-05-13 19:08:31 +0200 | [diff] [blame] | 591 | |
| 592 | struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog); |
Alexei Starovoitov | 4e10df9 | 2015-07-20 20:34:18 -0700 | [diff] [blame] | 593 | bool bpf_helper_changes_skb_data(void *func); |
Alexei Starovoitov | 6225827 | 2014-05-13 19:50:46 -0700 | [diff] [blame] | 594 | |
Daniel Borkmann | c237ee5 | 2016-05-13 19:08:30 +0200 | [diff] [blame] | 595 | struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off, |
| 596 | const struct bpf_insn *patch, u32 len); |
Brenden Blanco | 6a773a1 | 2016-07-19 12:16:47 -0700 | [diff] [blame] | 597 | void bpf_warn_invalid_xdp_action(u32 act); |
Daniel Borkmann | c237ee5 | 2016-05-13 19:08:30 +0200 | [diff] [blame] | 598 | |
Daniel Borkmann | b954d83 | 2014-09-10 15:01:02 +0200 | [diff] [blame] | 599 | #ifdef CONFIG_BPF_JIT |
Daniel Borkmann | c94987e | 2016-05-13 19:08:27 +0200 | [diff] [blame] | 600 | extern int bpf_jit_enable; |
Daniel Borkmann | 4f3446b | 2016-05-13 19:08:32 +0200 | [diff] [blame] | 601 | extern int bpf_jit_harden; |
Daniel Borkmann | c94987e | 2016-05-13 19:08:27 +0200 | [diff] [blame] | 602 | |
Daniel Borkmann | b954d83 | 2014-09-10 15:01:02 +0200 | [diff] [blame] | 603 | typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size); |
| 604 | |
| 605 | struct bpf_binary_header * |
| 606 | bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, |
| 607 | unsigned int alignment, |
| 608 | bpf_jit_fill_hole_t bpf_fill_ill_insns); |
| 609 | void bpf_jit_binary_free(struct bpf_binary_header *hdr); |
| 610 | |
| 611 | void bpf_jit_compile(struct bpf_prog *fp); |
| 612 | void bpf_jit_free(struct bpf_prog *fp); |
| 613 | |
Daniel Borkmann | 4f3446b | 2016-05-13 19:08:32 +0200 | [diff] [blame] | 614 | struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp); |
| 615 | void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other); |
| 616 | |
Daniel Borkmann | b954d83 | 2014-09-10 15:01:02 +0200 | [diff] [blame] | 617 | static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen, |
| 618 | u32 pass, void *image) |
| 619 | { |
Daniel Borkmann | b13138e | 2015-07-30 12:42:49 +0200 | [diff] [blame] | 620 | pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen, |
| 621 | proglen, pass, image, current->comm, task_pid_nr(current)); |
| 622 | |
Daniel Borkmann | b954d83 | 2014-09-10 15:01:02 +0200 | [diff] [blame] | 623 | if (image) |
| 624 | print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET, |
| 625 | 16, 1, image, proglen, false); |
| 626 | } |
Daniel Borkmann | 4f3446b | 2016-05-13 19:08:32 +0200 | [diff] [blame] | 627 | |
| 628 | static inline bool bpf_jit_is_ebpf(void) |
| 629 | { |
| 630 | # ifdef CONFIG_HAVE_EBPF_JIT |
| 631 | return true; |
| 632 | # else |
| 633 | return false; |
| 634 | # endif |
| 635 | } |
| 636 | |
| 637 | static inline bool bpf_jit_blinding_enabled(void) |
| 638 | { |
| 639 | /* These are the prerequisites, should someone ever have the |
| 640 | * idea to call blinding outside of them, we make sure to |
| 641 | * bail out. |
| 642 | */ |
| 643 | if (!bpf_jit_is_ebpf()) |
| 644 | return false; |
| 645 | if (!bpf_jit_enable) |
| 646 | return false; |
| 647 | if (!bpf_jit_harden) |
| 648 | return false; |
| 649 | if (bpf_jit_harden == 1 && capable(CAP_SYS_ADMIN)) |
| 650 | return false; |
| 651 | |
| 652 | return true; |
| 653 | } |
Daniel Borkmann | b954d83 | 2014-09-10 15:01:02 +0200 | [diff] [blame] | 654 | #else |
| 655 | static inline void bpf_jit_compile(struct bpf_prog *fp) |
| 656 | { |
| 657 | } |
| 658 | |
| 659 | static inline void bpf_jit_free(struct bpf_prog *fp) |
| 660 | { |
| 661 | bpf_prog_unlock_free(fp); |
| 662 | } |
| 663 | #endif /* CONFIG_BPF_JIT */ |
| 664 | |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 665 | #define BPF_ANC BIT(15) |
| 666 | |
Rabin Vincent | 55795ef | 2016-01-05 16:23:07 +0100 | [diff] [blame] | 667 | static inline bool bpf_needs_clear_a(const struct sock_filter *first) |
| 668 | { |
| 669 | switch (first->code) { |
| 670 | case BPF_RET | BPF_K: |
| 671 | case BPF_LD | BPF_W | BPF_LEN: |
| 672 | return false; |
| 673 | |
| 674 | case BPF_LD | BPF_W | BPF_ABS: |
| 675 | case BPF_LD | BPF_H | BPF_ABS: |
| 676 | case BPF_LD | BPF_B | BPF_ABS: |
| 677 | if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X) |
| 678 | return true; |
| 679 | return false; |
| 680 | |
| 681 | default: |
| 682 | return true; |
| 683 | } |
| 684 | } |
| 685 | |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 686 | static inline u16 bpf_anc_helper(const struct sock_filter *ftest) |
| 687 | { |
| 688 | BUG_ON(ftest->code & BPF_ANC); |
| 689 | |
| 690 | switch (ftest->code) { |
| 691 | case BPF_LD | BPF_W | BPF_ABS: |
| 692 | case BPF_LD | BPF_H | BPF_ABS: |
| 693 | case BPF_LD | BPF_B | BPF_ABS: |
| 694 | #define BPF_ANCILLARY(CODE) case SKF_AD_OFF + SKF_AD_##CODE: \ |
| 695 | return BPF_ANC | SKF_AD_##CODE |
| 696 | switch (ftest->k) { |
| 697 | BPF_ANCILLARY(PROTOCOL); |
| 698 | BPF_ANCILLARY(PKTTYPE); |
| 699 | BPF_ANCILLARY(IFINDEX); |
| 700 | BPF_ANCILLARY(NLATTR); |
| 701 | BPF_ANCILLARY(NLATTR_NEST); |
| 702 | BPF_ANCILLARY(MARK); |
| 703 | BPF_ANCILLARY(QUEUE); |
| 704 | BPF_ANCILLARY(HATYPE); |
| 705 | BPF_ANCILLARY(RXHASH); |
| 706 | BPF_ANCILLARY(CPU); |
| 707 | BPF_ANCILLARY(ALU_XOR_X); |
| 708 | BPF_ANCILLARY(VLAN_TAG); |
| 709 | BPF_ANCILLARY(VLAN_TAG_PRESENT); |
| 710 | BPF_ANCILLARY(PAY_OFFSET); |
| 711 | BPF_ANCILLARY(RANDOM); |
Michal Sekletar | 27cd545 | 2015-03-24 14:48:41 +0100 | [diff] [blame] | 712 | BPF_ANCILLARY(VLAN_TPID); |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 713 | } |
| 714 | /* Fallthrough. */ |
| 715 | default: |
| 716 | return ftest->code; |
| 717 | } |
| 718 | } |
| 719 | |
Zi Shen Lim | 9f12fbe | 2014-07-03 07:56:54 -0700 | [diff] [blame] | 720 | void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb, |
| 721 | int k, unsigned int size); |
| 722 | |
| 723 | static inline void *bpf_load_pointer(const struct sk_buff *skb, int k, |
| 724 | unsigned int size, void *buffer) |
| 725 | { |
| 726 | if (k >= 0) |
| 727 | return skb_header_pointer(skb, k, size, buffer); |
| 728 | |
| 729 | return bpf_internal_load_pointer_neg_helper(skb, k, size); |
| 730 | } |
| 731 | |
Michal Sekletar | ea02f94 | 2014-01-17 17:09:45 +0100 | [diff] [blame] | 732 | static inline int bpf_tell_extensions(void) |
| 733 | { |
Daniel Borkmann | 3769229 | 2014-01-21 00:19:37 +0100 | [diff] [blame] | 734 | return SKF_AD_MAX; |
Michal Sekletar | ea02f94 | 2014-01-17 17:09:45 +0100 | [diff] [blame] | 735 | } |
| 736 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | #endif /* __LINUX_FILTER_H__ */ |