From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.5 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, USER_AGENT_MUTT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1D937C43218 for ; Fri, 26 Apr 2019 10:51:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E07DA206A3 for ; Fri, 26 Apr 2019 10:51:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=resnulli-us.20150623.gappssmtp.com header.i=@resnulli-us.20150623.gappssmtp.com header.b="tkzzJ5Ar" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726379AbfDZKvY (ORCPT ); Fri, 26 Apr 2019 06:51:24 -0400 Received: from mail-wr1-f65.google.com ([209.85.221.65]:38250 "EHLO mail-wr1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726167AbfDZKvV (ORCPT ); Fri, 26 Apr 2019 06:51:21 -0400 Received: by mail-wr1-f65.google.com with SMTP id k16so3824956wrn.5 for ; Fri, 26 Apr 2019 03:51:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=resnulli-us.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=oYR47EfvfB3INLmcV5CUtMqytev5exvJp3sCteIx6Jo=; b=tkzzJ5ArDKyVndEsWm9NfYy6jIFvMjy2MOiy+V2/BVHUWkjsLUMeCSgupRDE7ADW42 b8rGLn+n1ijUVg++vw46kEbWhqxm2UO19JEA+m+khiJDXgOzMOrbmPVAhbE4LndekdXZ /HPncxDU3FMFAmIedbJ9WdnHMKqEB8OR5zt3e/pRChA/1nG8OXifkc5/u+AwdTFkss0n r+OJt9O393b71vghxaUpXsDvVNpbSqEs3TADOZjKzfppN+POw6F+5JVLn5ZlX+JCSKER QiyzU7nwmS6T9hj1+aGANbQxNpNpAKAvI6ZMenvj/3HnGyNKu/Mh/z9g4GkBSAPmog2O /jLg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=oYR47EfvfB3INLmcV5CUtMqytev5exvJp3sCteIx6Jo=; b=GmbeOVGJZGTRtdJoIphoL1KpeWdZR+CgSyTYb5Llb+naNDJcTvch8OhNUsWzXpvZzT QuOv8S0f218QDcWvcnd3gzAC2G2/U5SWojqa5GBNsuFdIk2y42EoC0JzWmNuaVav/U47 ws5alJSF+gLmmKIwUHTSvY5MKsPITKm0wtHywO2e81GEPlpq7pSyR3e7gXX5UsZT6Ltc Vwa2GuU0FUnmeiF0AQm4aUr6veIfBSg6rftY/Ha3tMbDZx9RBDgQky4CXkOnRr8ID+/S wfaBpcD0M5pWWVm1l4ebqf6aQ+/khB0f6waBLJbz7kjiudiOeADKTvXpMTxkWv/EJkjR ezlA== X-Gm-Message-State: APjAAAUfYVoHsQRV0n2i6S74nWS/7VNrPp7EoDqudQiOv+6XDRvOZ5bX qlQ33j9+0w5iuUQ+tSnG3D2Ksg== X-Google-Smtp-Source: APXvYqxc3sSTifRyeC9QxLaeoo+g1CWCCxOG+uRy15EAEjhf47mlHUSqTdsvhCTvGQS+S2CBqI5Vmw== X-Received: by 2002:a5d:53c8:: with SMTP id a8mr7068895wrw.38.1556275879248; Fri, 26 Apr 2019 03:51:19 -0700 (PDT) Received: from localhost (mail.chocen-mesto.cz. [85.163.43.2]) by smtp.gmail.com with ESMTPSA id u5sm2756099wml.4.2019.04.26.03.51.18 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 26 Apr 2019 03:51:18 -0700 (PDT) Date: Fri, 26 Apr 2019 12:51:17 +0200 From: Jiri Pirko To: Michal Kubecek Cc: "David S. Miller" , netdev@vger.kernel.org, David Ahern , Johannes Berg , Jiri Pirko , Pablo Neira Ayuso , Jozsef Kadlecsik , Florian Westphal , netfilter-devel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH net-next 1/3] netlink: make nla_nest_start() add NLA_F_NESTED flag Message-ID: <20190426105117.GA2157@nanopsycho> References: <5278b013a953d4fb2e7944fc810f783d70ea52a5.1556269635.git.mkubecek@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5278b013a953d4fb2e7944fc810f783d70ea52a5.1556269635.git.mkubecek@suse.cz> User-Agent: Mutt/1.11.3 (2019-02-01) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Fri, Apr 26, 2019 at 11:13:06AM CEST, mkubecek@suse.cz wrote: >Even if the NLA_F_NESTED flag was introduced more than 11 years ago, most >netlink based interfaces (including recently added ones) are still not >setting it in kernel generated messages. Without the flag, message parsers >not aware of attribute semantics (e.g. wireshark dissector or libmnl's >mnl_nlmsg_fprintf()) cannot recognize nested attributes and won't display >the structure of their contents. > >Unfortunately we cannot just add the flag everywhere as there may be >userspace applications which check nlattr::nla_type directly rather than >through a helper masking out the flags. Therefore the patch renames >nla_nest_start() to nla_nest_start_noflag() and introduces nla_nest_start() >as a wrapper adding NLA_F_NESTED. The calls which add NLA_F_NESTED manually >are rewritten to use nla_nest_start(). > >Except for changes in include/net/netlink.h, the patch was generated using >this semantic patch: > >@@ expression E1, E2; @@ >-nla_nest_start(E1, E2) >+nla_nest_start_noflag(E1, E2) > >@@ expression E1, E2; @@ >-nla_nest_start_noflag(E1, E2 | NLA_F_NESTED) >+nla_nest_start(E1, E2) > >Signed-off-by: Michal Kubecek Acked-by: Jiri Pirko