NL_RTA_DST
{ .type = NL_RTA_DST, .off = _OUT(rta_dst), .cb = snl_attr_get_ip },
#define RTA_DST NL_RTA_DST
nlattr_add(nw, NL_RTA_DST, 4, &addr);
nlattr_add(nw, NL_RTA_DST, 16, &addr);
{ .type = NL_RTA_DST, .off = _OUT(rta_dst), .cb = nlattr_get_ip },