IFLA_LINK
case IFLA_LINK:
nlattr_add_u32(nw, IFLA_LINK, ifp->if_index);
nlattr_add_u32(nw, IFLA_LINK, parent_index);
{ .type = IFLA_LINK, .off = _OUT(ifla_link), .cb = nlattr_get_uint32 },