PF_RT_RCV_IFNAME
snl_add_msg_attr_string(nw, PF_RT_RCV_IFNAME, r->rcv_ifname);
{ .type = PF_RT_RCV_IFNAME, .off = _OUT(r.rcv_ifname), .arg = (void*)IFNAMSIZ, .cb = snl_attr_copy_string },
{ .type = PF_RT_RCV_IFNAME, .off = _OUT(rcv_ifname), .arg = (void *)IFNAMSIZ, .cb = nlattr_get_chara },
nlattr_add_string(nw, PF_RT_RCV_IFNAME, rule->rcv_ifname);