NL_RTA_GATEWAY
{ .type = NL_RTA_GATEWAY, .off = _OUT(rta_gw), .cb = snl_attr_get_ip },
{ .type = NL_RTA_GATEWAY, .off = _OUT(gw), .cb = snl_attr_get_ip },
#define RTA_GATEWAY NL_RTA_GATEWAY
nlattr_add(nw, NL_RTA_GATEWAY, 4, &nh->gw4_sa.sin_addr);
nlattr_add(nw, NL_RTA_GATEWAY, 16, &gw6);
{ .type = NL_RTA_GATEWAY, .off = _OUT(gw), .cb = nlattr_get_ip },
{ .type = NL_RTA_GATEWAY, .off = _OUT(rta_gw), .cb = nlattr_get_ip },