ebpf bpf_load_program

Posted 2021-03-14 dream397

size_t insns_cnt = sizeof(prog) / sizeof(struct bpf_insn);
prog_fd = bpf_load_program(BPF_PROG_TYPE_SOCKET_FILTER, prog, insns_cnt,
                   "GPL", 0, bpf_log_buf, BPF_LOG_BUF_SIZE);

int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
             size_t insns_cnt, const char *license,
             __u32 kern_version, char *log_buf,
             size_t log_buf_sz)
{
    struct bpf_load_program_attr load_attr;
    memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
    load_attr.prog_type = type;
    load_attr.expected_attach_type = 0;
    load_attr.name = NULL;
    load_attr.insns = insns;
    load_attr.insns_cnt = insns_cnt;
    load_attr.license = license;
    load_attr.kern_version = kern_version;
    return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz);
}

 

int load_bpf_file(char *path)
{
        return do_load_bpf_file(path, NULL);
}

int load_bpf_file_fixup_map(const char *path, fixup_map_cb fixup_map)
{
            return do_load_bpf_file(path, fixup_map);
}
do_load_bpf_file
   ret = load_and_attach(shname, data->d_buf,data->d_size);
load_and_attach  parses prog section and maps prog
load_and_attach(const char *event, struct bpf_insn *prog, int size)
     load_elf_maps_section
         load_maps
             bpf_create_map_node
     fd = bpf_load_program(prog_type, prog, insns_cnt, license, kern_version, bpf_log_buf, BPF_LOG_BUF_SIZE);