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{ "id": 2228490, "url": "http://patchwork.ozlabs.org/api/1.1/covers/2228490/?format=api", "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=api", "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=api", "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=api", "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 header.b=j8Pb2hy+;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n 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"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(-)" }