From patchwork Wed Aug 19 10:29:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johannes Berg X-Patchwork-Id: 1347686 X-Patchwork-Delegate: dsahern@gmail.com Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=sipsolutions.net Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4BWkXt2LbNz9sTX for ; Wed, 19 Aug 2020 20:29:18 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727846AbgHSK3P (ORCPT ); Wed, 19 Aug 2020 06:29:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41202 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727837AbgHSK3H (ORCPT ); Wed, 19 Aug 2020 06:29:07 -0400 Received: from sipsolutions.net (s3.sipsolutions.net [IPv6:2a01:4f8:191:4433::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 63865C061757 for ; Wed, 19 Aug 2020 03:29:07 -0700 (PDT) Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.94) (envelope-from ) id 1k8LL7-006mIZ-IW; Wed, 19 Aug 2020 12:29:05 +0200 From: Johannes Berg To: netdev@vger.kernel.org Cc: Stephen Hemminger Subject: [PATCH 1/2] libnetlink: add rtattr_for_each_nested() iteration macro Date: Wed, 19 Aug 2020 12:29:02 +0200 Message-Id: <20200819102903.21740-1-johannes@sipsolutions.net> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This is useful for iterating elements in a nested attribute, if they're not parsed with a strict length limit or such. Signed-off-by: Johannes Berg --- include/libnetlink.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/libnetlink.h b/include/libnetlink.h index e27516f7648f..0d4a9f29afbd 100644 --- a/include/libnetlink.h +++ b/include/libnetlink.h @@ -284,4 +284,9 @@ int rtnl_from_file(FILE *, rtnl_listen_filter_t handler, * messages from dump file */ #define NLMSG_TSTAMP 15 +#define rtattr_for_each_nested(attr, nest) \ + for ((attr) = (void *)RTA_DATA(nest); \ + RTA_OK(attr, RTA_PAYLOAD(nest) - ((char *)(attr) - (char *)RTA_DATA((nest)))); \ + (attr) = RTA_TAIL((attr))) + #endif /* __LIBNETLINK_H__ */