• Alexei Starovoitov's avatar
    samples: bpf: elf_bpf file loader · 249b812d
    Alexei Starovoitov authored
    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: default avatarAlexei Starovoitov <ast@plumgrid.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    249b812d
bpf_load.c 4.32 KB