/* * Linux Socket Filter Data Structures */#ifndef __TOOLS_LINUX_FILTER_H#define __TOOLS_LINUX_FILTER_H #include <linux/bpf.h> /* ArgX, context and stack frame pointer register positions. Note, * Arg1, Arg2, Arg3, etc are used as argument mappings of function * calls in BPF_CALL instruction. */#define BPF_REG_ARG1	BPF_REG_1#define BPF_REG_ARG2	BPF_REG_2#define BPF_REG_ARG3	BPF_REG_3#define BPF_REG_ARG4	BPF_REG_4#define BPF_REG_ARG5	BPF_REG_5#define BPF_REG_CTX	BPF_REG_6#define BPF_REG_FP	BPF_REG_10 /* Additional register mappings for converted user programs. */#define BPF_REG_A	BPF_REG_0#define BPF_REG_X	BPF_REG_7#define BPF_REG_TMP	BPF_REG_8 /* BPF program can access up to 512 bytes of stack space. */#define MAX_BPF_STACK	512 /* Helper macros for filter block array initializers. */ /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */ #define BPF_ALU64_REG(OP, DST, SRC)				\	((struct bpf_insn) {					\		.code  = BPF_ALU64 | BPF_OP(OP) | BPF_X,	\		.dst_reg = DST,					\		.src_reg = SRC,					\		.off   = 0,					\		.imm   = 0 }) #define BPF_ALU32_REG(OP, DST, SRC)				\	((struct bpf_insn) {					\		.code  = BPF_ALU | BPF_OP(OP) | BPF_X,		\		.dst_reg = DST,					\		.src_reg = SRC,					\		.off   = 0,					\		.imm   = 0 }) /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */ #define BPF_ALU64_IMM(OP, DST, IMM)				\	((struct bpf_insn) {					\		.code  = BPF_ALU64 | BPF_OP(OP) | BPF_K,	\		.dst_reg = DST,					\		.src_reg = 0,					\		.off   = 0,					\		.imm   = IMM }) #define BPF_ALU32_IMM(OP, DST, IMM)				\	((struct bpf_insn) {					\		.code  = BPF_ALU | BPF_OP(OP) | BPF_K,		\		.dst_reg = DST,					\		.src_reg = 0,					\		.off   = 0,					\		.imm   = IMM }) /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */ #define BPF_ENDIAN(TYPE, DST, LEN)				\	((struct bpf_insn) {					\		.code  = BPF_ALU | BPF_END | BPF_SRC(TYPE),	\		.dst_reg = DST,					\		.src_reg = 0,					\		.off   = 0,					\		.imm   = LEN }) /* Short form of mov, dst_reg = src_reg */ #define BPF_MOV64_REG(DST, SRC)					\	((struct bpf_insn) {					\		.code  = BPF_ALU64 | BPF_MOV | BPF_X,		\		.dst_reg = DST,					\		.src_reg = SRC,					\		.off   = 0,					\		.imm   = 0 }) #define BPF_MOV32_REG(DST, SRC)					\	((struct bpf_insn) {					\		.code  = BPF_ALU | BPF_MOV | BPF_X,		\		.dst_reg = DST,					\		.src_reg = SRC,					\		.off   = 0,					\		.imm   = 0 }) /* Short form of mov, dst_reg = imm32 */ #define BPF_MOV64_IMM(DST, IMM)					\	((struct bpf_insn) {					\		.code  = BPF_ALU64 | BPF_MOV | BPF_K,		\		.dst_reg = DST,					\		.src_reg = 0,					\		.off   = 0,					\		.imm   = IMM }) #define BPF_MOV32_IMM(DST, IMM)					\	((struct bpf_insn) {					\		.code  = BPF_ALU | BPF_MOV | BPF_K,		\		.dst_reg = DST,					\		.src_reg = 0,					\		.off   = 0,					\		.imm   = IMM }) /* Short form of mov based on type,  BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */ #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM)			\	((struct bpf_insn) {					\		.code  = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE),	\		.dst_reg = DST,					\		.src_reg = SRC,					\		.off   = 0,					\		.imm   = IMM }) #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM)			\	((struct bpf_insn) {					\		.code  = BPF_ALU | BPF_MOV | BPF_SRC(TYPE),	\		.dst_reg = DST,					\		.src_reg = SRC,					\		.off   = 0,					\		.imm   = IMM }) /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */ #define BPF_LD_ABS(SIZE, IMM)					\	((struct bpf_insn) {					\		.code  = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS,	\		.dst_reg = 0,					\		.src_reg = 0,					\		.off   = 0,					\		.imm   = IMM }) /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */ #define BPF_LD_IND(SIZE, SRC, IMM)				\	((struct bpf_insn) {					\		.code  = BPF_LD | BPF_SIZE(SIZE) | BPF_IND,	\		.dst_reg = 0,					\		.src_reg = SRC,					\		.off   = 0,					\		.imm   = IMM }) /* Memory load, dst_reg = *(uint *) (src_reg + off16) */ #define BPF_LDX_MEM(SIZE, DST, SRC, OFF)			\	((struct bpf_insn) {					\		.code  = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM,	\		.dst_reg = DST,					\		.src_reg = SRC,					\		.off   = OFF,					\		.imm   = 0 }) /* Memory store, *(uint *) (dst_reg + off16) = src_reg */ #define BPF_STX_MEM(SIZE, DST, SRC, OFF)			\	((struct bpf_insn) {					\		.code  = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM,	\		.dst_reg = DST,					\		.src_reg = SRC,					\		.off   = OFF,					\		.imm   = 0 }) /* Memory store, *(uint *) (dst_reg + off16) = imm32 */ #define BPF_ST_MEM(SIZE, DST, OFF, IMM)				\	((struct bpf_insn) {					\		.code  = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM,	\		.dst_reg = DST,					\		.src_reg = 0,					\		.off   = OFF,					\		.imm   = IMM }) /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */ #define BPF_JMP_REG(OP, DST, SRC, OFF)				\	((struct bpf_insn) {					\		.code  = BPF_JMP | BPF_OP(OP) | BPF_X,		\		.dst_reg = DST,					\		.src_reg = SRC,					\		.off   = OFF,					\		.imm   = 0 }) /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */ #define BPF_JMP_IMM(OP, DST, IMM, OFF)				\	((struct bpf_insn) {					\		.code  = BPF_JMP | BPF_OP(OP) | BPF_K,		\		.dst_reg = DST,					\		.src_reg = 0,					\		.off   = OFF,					\		.imm   = IMM }) /* Function call */ #define BPF_EMIT_CALL(FUNC)					\	((struct bpf_insn) {					\		.code  = BPF_JMP | BPF_CALL,			\		.dst_reg = 0,					\		.src_reg = 0,					\		.off   = 0,					\		.imm   = ((FUNC) - BPF_FUNC_unspec) }) /* Raw code statement block */ #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM)			\	((struct bpf_insn) {					\		.code  = CODE,					\		.dst_reg = DST,					\		.src_reg = SRC,					\		.off   = OFF,					\		.imm   = IMM }) /* Program exit */ #define BPF_EXIT_INSN()						\	((struct bpf_insn) {					\		.code  = BPF_JMP | BPF_EXIT,			\		.dst_reg = 0,					\		.src_reg = 0,					\		.off   = 0,					\		.imm   = 0 }) #endif /* __TOOLS_LINUX_FILTER_H */