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