PF_SCL_DESCR
{ .type = PF_SCL_DESCR, .off = _OUT(description), .arg_u32 = PF_SOURCELIM_DESCR_LEN, .cb = snl_attr_copy_string },
snl_add_msg_attr_string(&nw, PF_SCL_DESCR, lim->description);
{ .type = PF_SCL_DESCR, .off = _OUT(description), .arg = (void *)PF_STATELIM_DESCR_LEN, .cb = nlattr_get_chara },
nlattr_add_string(nw, PF_SCL_DESCR, attrs.description);