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65fdae3d18
For BPF offload we need to specify the ifindex when program is loaded now. Extend the bpf common code to accommodate that. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net>
303 lines
7.3 KiB
C
303 lines
7.3 KiB
C
/*
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* bpf_util.h BPF common code
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*
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* This program is free software; you can distribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Daniel Borkmann <daniel@iogearbox.net>
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* Jiri Pirko <jiri@resnulli.us>
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*/
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#ifndef __BPF_UTIL__
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#define __BPF_UTIL__
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#include <linux/bpf.h>
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#include <linux/filter.h>
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#include <linux/magic.h>
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#include <linux/elf-em.h>
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#include <linux/if_alg.h>
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#include "utils.h"
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#include "bpf_scm.h"
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#define BPF_ENV_UDS "TC_BPF_UDS"
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#define BPF_ENV_MNT "TC_BPF_MNT"
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#ifndef BPF_MAX_LOG
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# define BPF_MAX_LOG 4096
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#endif
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#define BPF_DIR_GLOBALS "globals"
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#ifndef BPF_FS_MAGIC
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# define BPF_FS_MAGIC 0xcafe4a11
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#endif
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#define BPF_DIR_MNT "/sys/fs/bpf"
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#ifndef TRACEFS_MAGIC
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# define TRACEFS_MAGIC 0x74726163
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#endif
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#define TRACE_DIR_MNT "/sys/kernel/tracing"
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#ifndef AF_ALG
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# define AF_ALG 38
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#endif
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#ifndef EM_BPF
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# define EM_BPF 247
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#endif
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struct bpf_cfg_ops {
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void (*cbpf_cb)(void *nl, const struct sock_filter *ops, int ops_len);
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void (*ebpf_cb)(void *nl, int fd, const char *annotation);
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};
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enum bpf_mode {
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CBPF_BYTECODE,
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CBPF_FILE,
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EBPF_OBJECT,
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EBPF_PINNED,
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BPF_MODE_MAX,
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};
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struct bpf_cfg_in {
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const char *object;
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const char *section;
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const char *uds;
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enum bpf_prog_type type;
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enum bpf_mode mode;
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__u32 ifindex;
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bool verbose;
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int argc;
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char **argv;
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struct sock_filter opcodes[BPF_MAXINSNS];
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union {
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int n_opcodes;
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int prog_fd;
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};
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};
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/* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
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#define BPF_ALU64_REG(OP, DST, SRC) \
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((struct bpf_insn) { \
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.code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = 0 })
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#define BPF_ALU32_REG(OP, DST, SRC) \
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((struct bpf_insn) { \
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.code = BPF_ALU | BPF_OP(OP) | BPF_X, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = 0 })
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/* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
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#define BPF_ALU64_IMM(OP, DST, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = 0, \
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.imm = IMM })
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#define BPF_ALU32_IMM(OP, DST, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ALU | BPF_OP(OP) | BPF_K, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = 0, \
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.imm = IMM })
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/* Short form of mov, dst_reg = src_reg */
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#define BPF_MOV64_REG(DST, SRC) \
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((struct bpf_insn) { \
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.code = BPF_ALU64 | BPF_MOV | BPF_X, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = 0 })
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#define BPF_MOV32_REG(DST, SRC) \
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((struct bpf_insn) { \
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.code = BPF_ALU | BPF_MOV | BPF_X, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = 0 })
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/* Short form of mov, dst_reg = imm32 */
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#define BPF_MOV64_IMM(DST, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ALU64 | BPF_MOV | BPF_K, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = 0, \
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.imm = IMM })
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#define BPF_MOV32_IMM(DST, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ALU | BPF_MOV | BPF_K, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = 0, \
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.imm = IMM })
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/* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
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#define BPF_LD_IMM64(DST, IMM) \
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BPF_LD_IMM64_RAW(DST, 0, IMM)
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#define BPF_LD_IMM64_RAW(DST, SRC, IMM) \
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((struct bpf_insn) { \
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.code = BPF_LD | BPF_DW | BPF_IMM, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = (__u32) (IMM) }), \
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((struct bpf_insn) { \
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.code = 0, /* zero is reserved opcode */ \
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.dst_reg = 0, \
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.src_reg = 0, \
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.off = 0, \
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.imm = ((__u64) (IMM)) >> 32 })
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#ifndef BPF_PSEUDO_MAP_FD
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# define BPF_PSEUDO_MAP_FD 1
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#endif
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/* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
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#define BPF_LD_MAP_FD(DST, MAP_FD) \
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BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
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/* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
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#define BPF_LD_ABS(SIZE, IMM) \
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((struct bpf_insn) { \
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.code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \
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.dst_reg = 0, \
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.src_reg = 0, \
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.off = 0, \
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.imm = IMM })
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/* Memory load, dst_reg = *(uint *) (src_reg + off16) */
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#define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \
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((struct bpf_insn) { \
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.code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = OFF, \
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.imm = 0 })
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/* Memory store, *(uint *) (dst_reg + off16) = src_reg */
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#define BPF_STX_MEM(SIZE, DST, SRC, OFF) \
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((struct bpf_insn) { \
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.code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = OFF, \
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.imm = 0 })
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/* Memory store, *(uint *) (dst_reg + off16) = imm32 */
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#define BPF_ST_MEM(SIZE, DST, OFF, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = OFF, \
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.imm = IMM })
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/* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
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#define BPF_JMP_REG(OP, DST, SRC, OFF) \
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((struct bpf_insn) { \
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.code = BPF_JMP | BPF_OP(OP) | BPF_X, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = OFF, \
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.imm = 0 })
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/* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
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#define BPF_JMP_IMM(OP, DST, IMM, OFF) \
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((struct bpf_insn) { \
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.code = BPF_JMP | BPF_OP(OP) | BPF_K, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = OFF, \
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.imm = IMM })
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/* Raw code statement block */
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#define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \
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((struct bpf_insn) { \
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.code = CODE, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = OFF, \
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.imm = IMM })
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/* Program exit */
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#define BPF_EXIT_INSN() \
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((struct bpf_insn) { \
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.code = BPF_JMP | BPF_EXIT, \
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.dst_reg = 0, \
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.src_reg = 0, \
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.off = 0, \
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.imm = 0 })
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int bpf_parse_common(struct bpf_cfg_in *cfg, const struct bpf_cfg_ops *ops);
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int bpf_load_common(struct bpf_cfg_in *cfg, const struct bpf_cfg_ops *ops,
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void *nl);
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int bpf_parse_and_load_common(struct bpf_cfg_in *cfg,
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const struct bpf_cfg_ops *ops, void *nl);
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const char *bpf_prog_to_default_section(enum bpf_prog_type type);
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int bpf_graft_map(const char *map_path, uint32_t *key, int argc, char **argv);
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int bpf_trace_pipe(void);
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void bpf_print_ops(FILE *f, struct rtattr *bpf_ops, __u16 len);
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int bpf_prog_load(enum bpf_prog_type type, const struct bpf_insn *insns,
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size_t size_insns, const char *license, char *log,
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size_t size_log);
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int bpf_prog_attach_fd(int prog_fd, int target_fd, enum bpf_attach_type type);
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int bpf_prog_detach_fd(int target_fd, enum bpf_attach_type type);
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int bpf_dump_prog_info(FILE *f, uint32_t id);
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#ifdef HAVE_ELF
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int bpf_send_map_fds(const char *path, const char *obj);
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int bpf_recv_map_fds(const char *path, int *fds, struct bpf_map_aux *aux,
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unsigned int entries);
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#else
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static inline int bpf_send_map_fds(const char *path, const char *obj)
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{
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return 0;
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}
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static inline int bpf_recv_map_fds(const char *path, int *fds,
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struct bpf_map_aux *aux,
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unsigned int entries)
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{
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return -1;
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}
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#endif /* HAVE_ELF */
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#endif /* __BPF_UTIL__ */
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