PF_RT_DNRPIPE
snl_add_msg_attr_u16(nw, PF_RT_DNRPIPE, r->dnrpipe);
{ .type = PF_RT_DNRPIPE, .off = _OUT(r.dnrpipe), .cb = snl_attr_get_uint16 },
{ .type = PF_RT_DNRPIPE, .off = _OUT(dnrpipe), .cb = nlattr_get_uint16 },
nlattr_add_u16(nw, PF_RT_DNRPIPE, rule->dnrpipe);