bpf_parse_prog
ret = bpf_parse_prog(tb[LWT_BPF_IN], &bpf->in,
ret = bpf_parse_prog(tb[LWT_BPF_OUT], &bpf->out,
ret = bpf_parse_prog(tb[LWT_BPF_XMIT], &bpf->xmit,