linux/samples/bpf/bpf_load.h
Alexei Starovoitov 249b812d80 samples: bpf: elf_bpf file loader
simple .o parser and loader using BPF syscall.
.o is a standard ELF generated by LLVM backend

It parses elf file compiled by llvm .c->.o
- parses 'maps' section and creates maps via BPF syscall
- parses 'license' section and passes it to syscall
- parses elf relocations for BPF maps and adjusts BPF_LD_IMM64 insns
  by storing map_fd into insn->imm and marking such insns as BPF_PSEUDO_MAP_FD
- loads eBPF programs via BPF syscall

One ELF file can contain multiple BPF programs.

int load_bpf_file(char *path);
populates prog_fd[] and map_fd[] with FDs received from bpf syscall

bpf_helpers.h - helper functions available to eBPF programs written in C

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-12-05 21:47:33 -08:00

25 lines
694 B
C

#ifndef __BPF_LOAD_H
#define __BPF_LOAD_H
#define MAX_MAPS 32
#define MAX_PROGS 32
extern int map_fd[MAX_MAPS];
extern int prog_fd[MAX_PROGS];
/* parses elf file compiled by llvm .c->.o
* . parses 'maps' section and creates maps via BPF syscall
* . parses 'license' section and passes it to syscall
* . parses elf relocations for BPF maps and adjusts BPF_LD_IMM64 insns by
* storing map_fd into insn->imm and marking such insns as BPF_PSEUDO_MAP_FD
* . loads eBPF programs via BPF syscall
*
* One ELF file can contain multiple BPF programs which will be loaded
* and their FDs stored stored in prog_fd array
*
* returns zero on success
*/
int load_bpf_file(char *path);
#endif