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https://git.proxmox.com/git/mirror_iproute2
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6d61a2b557
This patch converts iproute2 to use libbpf for loading and attaching BPF programs when it is available, which is started by Toke's implementation[1]. With libbpf iproute2 could correctly process BTF information and support the new-style BTF-defined maps, while keeping compatibility with the old internal map definition syntax. The old iproute2 bpf code is kept and will be used if no suitable libbpf is available. When using libbpf, wrapper code in bpf_legacy.c ensures that iproute2 will still understand the old map definition format, including populating map-in-map and tail call maps before load. In bpf_libbpf.c, we init iproute2 ctx and elf info first to check the legacy bytes. When handling the legacy maps, for map-in-maps, we create them manually and re-use the fd as they are associated with id/inner_id. For pin maps, we only set the pin path and let libbp load to handle it. For tail calls, we find it first and update the element after prog load. Other maps/progs will be loaded by libbpf directly. [1] https://lore.kernel.org/bpf/20190820114706.18546-1-toke@redhat.com/ Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Hangbin Liu <haliu@redhat.com> Signed-off-by: David Ahern <dsahern@gmail.com>
328 lines
8.3 KiB
C
328 lines
8.3 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/btf.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(struct rtattr *bpf_ops, __u16 len);
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int bpf_prog_load_dev(enum bpf_prog_type type, const struct bpf_insn *insns,
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size_t size_insns, const char *license, __u32 ifindex,
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char *log, size_t size_log);
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int bpf_program_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_program_attach(int prog_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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#ifdef HAVE_LIBBPF
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int iproute2_bpf_elf_ctx_init(struct bpf_cfg_in *cfg);
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int iproute2_bpf_fetch_ancillary(void);
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int iproute2_get_root_path(char *root_path, size_t len);
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bool iproute2_is_pin_map(const char *libbpf_map_name, char *pathname);
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bool iproute2_is_map_in_map(const char *libbpf_map_name, struct bpf_elf_map *imap,
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struct bpf_elf_map *omap, char *omap_name);
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int iproute2_find_map_name_by_id(unsigned int map_id, char *name);
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int iproute2_load_libbpf(struct bpf_cfg_in *cfg);
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#endif /* HAVE_LIBBPF */
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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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#ifdef HAVE_LIBBPF
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static inline int iproute2_load_libbpf(struct bpf_cfg_in *cfg)
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{
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fprintf(stderr, "No ELF library support compiled in.\n");
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return -1;
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}
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#endif /* HAVE_LIBBPF */
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#endif /* HAVE_ELF */
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const char *get_libbpf_version(void);
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#endif /* __BPF_UTIL__ */
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