60702e8c7c
Extend struct rte_bpf_xsym with new fields to provide information about: - for variables - type and size - for functions - number of arguments and type/size of each argument and return value Such information would allow validate code to perform more extensive checking on input BPF program and catch misbehaving BPF code. That change would cause ABI/API breakage for librte_bpf. Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
144 lines
3.1 KiB
C
144 lines
3.1 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 1982, 1986, 1990, 1993
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* The Regents of the University of California.
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* Copyright(c) 2018 Intel Corporation.
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*/
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#ifndef _RTE_BPF_DEF_H_
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#define _RTE_BPF_DEF_H_
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/**
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* @file
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*
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* classic BPF (cBPF) and extended BPF (eBPF) related defines.
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* For more information regarding cBPF and eBPF ISA and their differences,
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* please refer to:
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* https://www.kernel.org/doc/Documentation/networking/filter.txt.
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* As a rule of thumb for that file:
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* all definitions used by both cBPF and eBPF start with bpf(BPF)_ prefix,
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* while eBPF only ones start with ebpf(EBPF)) prefix.
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*/
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* The instruction encodings.
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*/
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/* Instruction classes */
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#define BPF_CLASS(code) ((code) & 0x07)
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#define BPF_LD 0x00
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#define BPF_LDX 0x01
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#define BPF_ST 0x02
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#define BPF_STX 0x03
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#define BPF_ALU 0x04
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#define BPF_JMP 0x05
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#define BPF_RET 0x06
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#define BPF_MISC 0x07
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#define EBPF_ALU64 0x07
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/* ld/ldx fields */
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#define BPF_SIZE(code) ((code) & 0x18)
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#define BPF_W 0x00
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#define BPF_H 0x08
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#define BPF_B 0x10
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#define EBPF_DW 0x18
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#define BPF_MODE(code) ((code) & 0xe0)
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#define BPF_IMM 0x00
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#define BPF_ABS 0x20
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#define BPF_IND 0x40
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#define BPF_MEM 0x60
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#define BPF_LEN 0x80
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#define BPF_MSH 0xa0
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#define EBPF_XADD 0xc0
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/* alu/jmp fields */
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#define BPF_OP(code) ((code) & 0xf0)
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#define BPF_ADD 0x00
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#define BPF_SUB 0x10
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#define BPF_MUL 0x20
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#define BPF_DIV 0x30
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#define BPF_OR 0x40
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#define BPF_AND 0x50
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#define BPF_LSH 0x60
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#define BPF_RSH 0x70
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#define BPF_NEG 0x80
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#define BPF_MOD 0x90
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#define BPF_XOR 0xa0
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#define EBPF_MOV 0xb0
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#define EBPF_ARSH 0xc0
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#define EBPF_END 0xd0
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#define BPF_JA 0x00
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#define BPF_JEQ 0x10
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#define BPF_JGT 0x20
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#define BPF_JGE 0x30
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#define BPF_JSET 0x40
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#define EBPF_JNE 0x50
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#define EBPF_JSGT 0x60
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#define EBPF_JSGE 0x70
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#define EBPF_CALL 0x80
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#define EBPF_EXIT 0x90
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#define EBPF_JLT 0xa0
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#define EBPF_JLE 0xb0
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#define EBPF_JSLT 0xc0
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#define EBPF_JSLE 0xd0
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#define BPF_SRC(code) ((code) & 0x08)
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#define BPF_K 0x00
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#define BPF_X 0x08
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/* if BPF_OP(code) == EBPF_END */
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#define EBPF_TO_LE 0x00 /* convert to little-endian */
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#define EBPF_TO_BE 0x08 /* convert to big-endian */
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/*
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* eBPF registers
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*/
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enum {
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EBPF_REG_0, /* return value from internal function/for eBPF program */
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EBPF_REG_1, /* 0-th argument to internal function */
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EBPF_REG_2, /* 1-th argument to internal function */
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EBPF_REG_3, /* 2-th argument to internal function */
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EBPF_REG_4, /* 3-th argument to internal function */
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EBPF_REG_5, /* 4-th argument to internal function */
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EBPF_REG_6, /* callee saved register */
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EBPF_REG_7, /* callee saved register */
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EBPF_REG_8, /* callee saved register */
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EBPF_REG_9, /* callee saved register */
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EBPF_REG_10, /* stack pointer (read-only) */
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EBPF_REG_NUM,
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};
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/*
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* eBPF instruction format
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*/
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struct ebpf_insn {
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uint8_t code;
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uint8_t dst_reg:4;
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uint8_t src_reg:4;
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int16_t off;
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int32_t imm;
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};
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/*
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* eBPF allows functions with R1-R5 as arguments.
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*/
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#define EBPF_FUNC_MAX_ARGS (EBPF_REG_6 - EBPF_REG_1)
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#ifdef __cplusplus
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}
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#endif
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#endif /* RTE_BPF_DEF_H_ */
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