PF_LI_LIMIT
snl_add_msg_attr_u32(&nw, PF_LI_LIMIT, limit);
{ .type = PF_LI_LIMIT, .off = _OUT(limit), .cb = snl_attr_get_uint32 },
{ .type = PF_LI_LIMIT, .off = _OUT(limit), .cb = nlattr_get_uint32 },
nlattr_add_u32(nw, PF_LI_LIMIT, attrs.limit);