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/*
* bpf_util.h BPF common code
*
* This program is free software; you can distribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Daniel Borkmann <daniel@iogearbox.net>
* Jiri Pirko <jiri@resnulli.us>
*/
#ifndef __BPF_UTIL__
#define __BPF_UTIL__
#include <linux/bpf.h>
#include <linux/btf.h>
#include <linux/filter.h>
#include <linux/magic.h>
#include <linux/elf-em.h>
#include <linux/if_alg.h>
#include "utils.h"
#include "bpf_scm.h"
#define BPF_ENV_UDS "TC_BPF_UDS"
#define BPF_ENV_MNT "TC_BPF_MNT"
#ifndef BPF_MAX_LOG
# define BPF_MAX_LOG 4096
#endif
#define BPF_DIR_GLOBALS "globals"
#ifndef BPF_FS_MAGIC
# define BPF_FS_MAGIC 0xcafe4a11
#endif
#define BPF_DIR_MNT "/sys/fs/bpf"
#ifndef TRACEFS_MAGIC
# define TRACEFS_MAGIC 0x74726163
#endif
#define TRACE_DIR_MNT "/sys/kernel/tracing"
#ifndef AF_ALG
# define AF_ALG 38
#endif
#ifndef EM_BPF
# define EM_BPF 247
#endif
struct bpf_cfg_ops {
void (*cbpf_cb)(void *nl, const struct sock_filter *ops, int ops_len);
void (*ebpf_cb)(void *nl, int fd, const char *annotation);
};
enum bpf_mode {
CBPF_BYTECODE,
CBPF_FILE,
EBPF_OBJECT,
EBPF_PINNED,
BPF_MODE_MAX,
};
struct bpf_cfg_in {
const char *object;
const char *section;
const char *uds;
enum bpf_prog_type type;
enum bpf_mode mode;
__u32 ifindex;
bool verbose;
int argc;
char **argv;
struct sock_filter opcodes[BPF_MAXINSNS];
union {
int n_opcodes;
int prog_fd;
};
};
/* 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 })
/* 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 })
/* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
#define BPF_LD_IMM64(DST, IMM) \
BPF_LD_IMM64_RAW(DST, 0, IMM)
#define BPF_LD_IMM64_RAW(DST, SRC, IMM) \
((struct bpf_insn) { \
.code = BPF_LD | BPF_DW | BPF_IMM, \
.dst_reg = DST, \
.src_reg = SRC, \
.off = 0, \
.imm = (__u32) (IMM) }), \
((struct bpf_insn) { \
.code = 0, /* zero is reserved opcode */ \
.dst_reg = 0, \
.src_reg = 0, \
.off = 0, \
.imm = ((__u64) (IMM)) >> 32 })
#ifndef BPF_PSEUDO_MAP_FD
# define BPF_PSEUDO_MAP_FD 1
#endif
/* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
#define BPF_LD_MAP_FD(DST, MAP_FD) \
BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
/* 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 })
/* 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 })
/* 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 })
int bpf_parse_common(struct bpf_cfg_in *cfg, const struct bpf_cfg_ops *ops);
int bpf_load_common(struct bpf_cfg_in *cfg, const struct bpf_cfg_ops *ops,
void *nl);
int bpf_parse_and_load_common(struct bpf_cfg_in *cfg,
const struct bpf_cfg_ops *ops, void *nl);
const char *bpf_prog_to_default_section(enum bpf_prog_type type);
int bpf_graft_map(const char *map_path, uint32_t *key, int argc, char **argv);
int bpf_trace_pipe(void);
void bpf_print_ops(struct rtattr *bpf_ops, __u16 len);
int bpf_prog_load_buf(enum bpf_prog_type type, const struct bpf_insn *insns,
size_t size_insns, const char *license, char *log,
size_t size_log);
int bpf_prog_attach_fd(int prog_fd, int target_fd, enum bpf_attach_type type);
int bpf_prog_detach_fd(int target_fd, enum bpf_attach_type type);
int bpf_dump_prog_info(FILE *f, uint32_t id);
#ifdef HAVE_ELF
int bpf_send_map_fds(const char *path, const char *obj);
int bpf_recv_map_fds(const char *path, int *fds, struct bpf_map_aux *aux,
unsigned int entries);
#else
static inline int bpf_send_map_fds(const char *path, const char *obj)
{
return 0;
}
static inline int bpf_recv_map_fds(const char *path, int *fds,
struct bpf_map_aux *aux,
unsigned int entries)
{
return -1;
}
#endif /* HAVE_ELF */
#endif /* __BPF_UTIL__ */