LWT_BPF_PROG_FD
[LWT_BPF_PROG_FD] = { .type = NLA_U32, },
if (!tb[LWT_BPF_PROG_FD] || !tb[LWT_BPF_PROG_NAME])
fd = nla_get_u32(tb[LWT_BPF_PROG_FD]);