PF_ST_IFNAME
{ .type = PF_ST_IFNAME, .off = _OUT(ifname), .cb = snl_attr_store_ifname },
snl_add_msg_attr_string(&nw, PF_ST_IFNAME, filter->ifname);
nlattr_add_string(nw, PF_ST_IFNAME, s->kif->pfik_name);
{ .type = PF_ST_IFNAME, .arg = (const void *)IFNAMSIZ, .off = _OUT(ifname), .cb = nlattr_get_chara },