From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by dpdk.org (Postfix) with ESMTP id 598BD3195; Tue, 6 Nov 2018 11:53:48 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 Nov 2018 02:53:47 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,471,1534834800"; d="scan'208";a="278717670" Received: from aburakov-mobl1.ger.corp.intel.com (HELO [10.237.220.143]) ([10.237.220.143]) by fmsmga006.fm.intel.com with ESMTP; 06 Nov 2018 02:53:46 -0800 To: Konstantin Ananyev , dev@dpdk.org Cc: stable@dpdk.org, ryan.e.hall@intel.com, alexander.v.gutkin@intel.com References: <1541413603-4792-1-git-send-email-konstantin.ananyev@intel.com> <1541420338-300-3-git-send-email-konstantin.ananyev@intel.com> From: "Burakov, Anatoly" Message-ID: Date: Tue, 6 Nov 2018 10:53:45 +0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1541420338-300-3-git-send-email-konstantin.ananyev@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-dev] [PATCH v2 2/2] ip_frag: use key length for key comparision X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Nov 2018 10:53:48 -0000 On 05-Nov-18 12:18 PM, Konstantin Ananyev wrote: > Right now reassembly code relies on src_dst[] being all zeroes to > determine is it free/occupied entry in the fragments table. > This is suboptimal and error prone - user can crash DPDK ip_reassembly > app by something like the following scapy script: > x=Ether(src=...,dst=...)/IP(dst='0.0.0.0',src='0.0.0.0',id=0)/('X'*1000) > frags=fragment(x, fragsize=500) > sendp(frags, iface=...) > To overcome that issue and reduce overhead of > 'key invalidate' and 'key is empty' operations - > add key_len into keys comparision procedure. > > Fixes: 4f1a8f633862 ("ip_frag: add IPv6 reassembly") > Cc: stable@dpdk.org > > Reported-by: Ryan E Hall > Reported-by: Alexander V Gutkin > Signed-off-by: Konstantin Ananyev > --- > @@ -44,9 +44,17 @@ struct ip_frag { > > /** @internal to uniquely identify fragmented datagram. */ > struct ip_frag_key { > - uint64_t src_dst[4]; /**< src address, first 8 bytes used for IPv4 */ > - uint32_t id; /**< dst address */ > - uint32_t key_len; /**< src/dst key length */ > + uint64_t src_dst[4]; > + /**< src and dst address, only first 8 bytes used for IPv4 */ > + RTE_STD_C11 > + union { > + uint64_t id_key_len; /**< combined for easy fetch */ > + __extension__ > + struct { > + uint32_t id; /**< packet id */ > + uint32_t key_len; /**< src/dst key length */ > + }; > + }; > }; Would that break ABI? > > /** > -- Thanks, Anatoly