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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 1982, 1986, 1990, 1993
* The Regents of the University of California.
* Copyright(c) 2018 Intel Corporation.
*/
#ifndef _RTE_BPF_DEF_H_
#define _RTE_BPF_DEF_H_
/**
* @file
*
* classic BPF (cBPF) and extended BPF (eBPF) related defines.
* For more information regarding cBPF and eBPF ISA and their differences,
* please refer to:
* https://www.kernel.org/doc/Documentation/networking/filter.txt.
* As a rule of thumb for that file:
* all definitions used by both cBPF and eBPF start with bpf(BPF)_ prefix,
* while eBPF only ones start with ebpf(EBPF)) prefix.
*/
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* The instruction encodings.
*/
/* Instruction classes */
#define BPF_CLASS(code) ((code) & 0x07)
#define BPF_LD 0x00
#define BPF_LDX 0x01
#define BPF_ST 0x02
#define BPF_STX 0x03
#define BPF_ALU 0x04
#define BPF_JMP 0x05
#define BPF_RET 0x06
#define BPF_MISC 0x07
#define EBPF_ALU64 0x07
/* ld/ldx fields */
#define BPF_SIZE(code) ((code) & 0x18)
#define BPF_W 0x00
#define BPF_H 0x08
#define BPF_B 0x10
#define EBPF_DW 0x18
#define BPF_MODE(code) ((code) & 0xe0)
#define BPF_IMM 0x00
#define BPF_ABS 0x20
#define BPF_IND 0x40
#define BPF_MEM 0x60
#define BPF_LEN 0x80
#define BPF_MSH 0xa0
#define EBPF_XADD 0xc0
/* alu/jmp fields */
#define BPF_OP(code) ((code) & 0xf0)
#define BPF_ADD 0x00
#define BPF_SUB 0x10
#define BPF_MUL 0x20
#define BPF_DIV 0x30
#define BPF_OR 0x40
#define BPF_AND 0x50
#define BPF_LSH 0x60
#define BPF_RSH 0x70
#define BPF_NEG 0x80
#define BPF_MOD 0x90
#define BPF_XOR 0xa0
#define EBPF_MOV 0xb0
#define EBPF_ARSH 0xc0
#define EBPF_END 0xd0
#define BPF_JA 0x00
#define BPF_JEQ 0x10
#define BPF_JGT 0x20
#define BPF_JGE 0x30
#define BPF_JSET 0x40
#define EBPF_JNE 0x50
#define EBPF_JSGT 0x60
#define EBPF_JSGE 0x70
#define EBPF_CALL 0x80
#define EBPF_EXIT 0x90
#define EBPF_JLT 0xa0
#define EBPF_JLE 0xb0
#define EBPF_JSLT 0xc0
#define EBPF_JSLE 0xd0
#define BPF_SRC(code) ((code) & 0x08)
#define BPF_K 0x00
#define BPF_X 0x08
/* if BPF_OP(code) == EBPF_END */
#define EBPF_TO_LE 0x00 /* convert to little-endian */
#define EBPF_TO_BE 0x08 /* convert to big-endian */
/*
* eBPF registers
*/
enum {
EBPF_REG_0, /* return value from internal function/for eBPF program */
EBPF_REG_1, /* 0-th argument to internal function */
EBPF_REG_2, /* 1-th argument to internal function */
EBPF_REG_3, /* 2-th argument to internal function */
EBPF_REG_4, /* 3-th argument to internal function */
EBPF_REG_5, /* 4-th argument to internal function */
EBPF_REG_6, /* callee saved register */
EBPF_REG_7, /* callee saved register */
EBPF_REG_8, /* callee saved register */
EBPF_REG_9, /* callee saved register */
EBPF_REG_10, /* stack pointer (read-only) */
EBPF_REG_NUM,
};
/*
* eBPF instruction format
*/
struct ebpf_insn {
uint8_t code;
uint8_t dst_reg:4;
uint8_t src_reg:4;
int16_t off;
int32_t imm;
};
/*
* eBPF allows functions with R1-R5 as arguments.
*/
#define EBPF_FUNC_MAX_ARGS (EBPF_REG_6 - EBPF_REG_1)
#ifdef __cplusplus
}
#endif
#endif /* RTE_BPF_DEF_H_ */
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