{"id":2228490,"url":"http://patchwork.ozlabs.org/api/1.1/covers/2228490/?format=json","web_url":"http://patchwork.ozlabs.org/project/netfilter-devel/cover/cover.1777214801.git.lucien.xin@gmail.com/","project":{"id":26,"url":"http://patchwork.ozlabs.org/api/1.1/projects/26/?format=json","name":"Netfilter Development","link_name":"netfilter-devel","list_id":"netfilter-devel.vger.kernel.org","list_email":"netfilter-devel@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<cover.1777214801.git.lucien.xin@gmail.com>","date":"2026-04-26T14:46:39","name":"[net,v2,0/2] sctp: fix a vtag verification failure caused by stale INITs","submitter":{"id":61073,"url":"http://patchwork.ozlabs.org/api/1.1/people/61073/?format=json","name":"Xin Long","email":"lucien.xin@gmail.com"},"mbox":"http://patchwork.ozlabs.org/project/netfilter-devel/cover/cover.1777214801.git.lucien.xin@gmail.com/mbox/","series":[{"id":501540,"url":"http://patchwork.ozlabs.org/api/1.1/series/501540/?format=json","web_url":"http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=501540","date":"2026-04-26T14:46:39","name":"sctp: fix a vtag verification failure caused by stale INITs","version":2,"mbox":"http://patchwork.ozlabs.org/series/501540/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/covers/2228490/comments/","headers":{"Return-Path":"\n <netfilter-devel+bounces-12199-incoming=patchwork.ozlabs.org@vger.kernel.org>","X-Original-To":["incoming@patchwork.ozlabs.org","netfilter-devel@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 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6a1803df08f44-8b0446f0cb3mr459818986d6.16.1777214937472;\n        Sun, 26 Apr 2026 07:48:57 -0700 (PDT)","From":"Xin Long <lucien.xin@gmail.com>","To":"network dev <netdev@vger.kernel.org>,\n\tnetfilter-devel@vger.kernel.org,\n\tlinux-sctp@vger.kernel.org","Cc":"davem@davemloft.net,\n\tkuba@kernel.org,\n\tEric Dumazet <edumazet@google.com>,\n\tPaolo Abeni <pabeni@redhat.com>,\n\tSimon Horman <horms@kernel.org>,\n\tPablo Neira Ayuso <pablo@netfilter.org>,\n\tFlorian Westphal <fw@strlen.de>,\n\tPhil Sutter <phil@nwl.cc>,\n\tMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>,\n\tYi Chen <yiche.cy@gmail.com>","Subject":"[PATCH net v2 0/2] sctp: fix a vtag verification failure caused by\n stale INITs","Date":"Sun, 26 Apr 2026 10:46:39 -0400","Message-ID":"<cover.1777214801.git.lucien.xin@gmail.com>","X-Mailer":"git-send-email 2.47.1","Precedence":"bulk","X-Mailing-List":"netfilter-devel@vger.kernel.org","List-Id":"<netfilter-devel.vger.kernel.org>","List-Subscribe":"<mailto:netfilter-devel+subscribe@vger.kernel.org>","List-Unsubscribe":"<mailto:netfilter-devel+unsubscribe@vger.kernel.org>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit"},"content":"Similar to Scenario B in commit 8e56b063c865 ( netfilter: handle the\nconnecting collision properly in nf_conntrack_proto_sctp\"):\n\nScenario B: INIT_ACK is delayed until the peer completes its own handshake\n\n  192.168.1.2 > 192.168.1.1: sctp (1) [INIT] [init tag: 3922216408]\n    192.168.1.1 > 192.168.1.2: sctp (1) [INIT] [init tag: 144230885]\n    192.168.1.2 > 192.168.1.1: sctp (1) [INIT ACK] [init tag: 3922216408]\n    192.168.1.1 > 192.168.1.2: sctp (1) [COOKIE ECHO]\n    192.168.1.2 > 192.168.1.1: sctp (1) [COOKIE ACK]\n  192.168.1.1 > 192.168.1.2: sctp (1) [INIT ACK] [init tag: 3914796021] *\n\nThere is another case:\n\nScenario F: INIT is delayed until the peer completes its own handshake\n\n  192.168.1.2 > 192.168.1.1: sctp (1) [INIT] [init tag: 3922216408]\n  (OVS upcall)\n    192.168.1.1 > 192.168.1.2: sctp (1) [INIT] [init tag: 144230885]\n    192.168.1.2 > 192.168.1.1: sctp (1) [INIT ACK] [init tag: 3922216408]\n    192.168.1.1 > 192.168.1.2: sctp (1) [COOKIE ECHO]\n    192.168.1.2 > 192.168.1.1: sctp (1) [COOKIE ACK]\n  192.168.1.2 > 192.168.1.1: sctp (1) [INIT] [init tag: 3922216408]\n  (delayed)\n  192.168.1.1 > 192.168.1.2: sctp (1) [INIT ACK] [init tag: 3914796021] *\n\nIn this case, the delayed INIT (e.g. due to OVS upcall) is recorded by\nconntrack, which prevents vtag verification from dropping the unexpected\nINIT-ACK in nf_conntrack_sctp_packet():\n\n  vtag = ct->proto.sctp.vtag[!dir];\n  if (!ct->proto.sctp.init[!dir] && vtag && vtag != ih->init_tag)\n          goto out_unlock;\n\nThis happens because ct->proto.sctp.init[!dir] is set by the delayed INIT,\neven though it is stale.\n\nFix this in two parts:\n\n- In netfilter: Do not record INITs whose init_tag matches the peer vtag,\n  as they carry no new handshake state in the 1st patch.\n\n- In SCTP: Prevent endpoints from responding to such INITs with INIT-ACK,\n  ensuring correctness even when middleboxes lack the netfilter fix in\n  the 2nd patch.\n\nA follow-up selftest for this scenario will be posted in a separate patch\nby Yi Chen.\n\nXin Long (2):\n  netfilter: skip recording stale or retransmitted INIT\n  sctp: discard stale INIT after handshake completion\n\n net/netfilter/nf_conntrack_proto_sctp.c | 10 +++++++---\n net/sctp/sm_statefuns.c                 |  6 ++++++\n 2 files changed, 13 insertions(+), 3 deletions(-)"}