{"id":2221786,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2221786/?format=json","web_url":"http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260410112352.23599-11-fw@strlen.de/","project":{"id":26,"url":"http://patchwork.ozlabs.org/api/1.2/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,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260410112352.23599-11-fw@strlen.de>","list_archive_url":null,"date":"2026-04-10T11:23:51","name":"[net-next,10/11] netfilter: nft_fwd_netdev: check ttl/hl before forwarding","commit_ref":null,"pull_url":null,"state":"handled-elsewhere","archived":true,"hash":"8bb48d9b033b6b6ecac6fedba2452b272457e902","submitter":{"id":1025,"url":"http://patchwork.ozlabs.org/api/1.2/people/1025/?format=json","name":"Florian Westphal","email":"fw@strlen.de"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260410112352.23599-11-fw@strlen.de/mbox/","series":[{"id":499444,"url":"http://patchwork.ozlabs.org/api/1.2/series/499444/?format=json","web_url":"http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=499444","date":"2026-04-10T11:23:46","name":"[net-next,01/11] ipvs: show the current conn_tab size to users","version":1,"mbox":"http://patchwork.ozlabs.org/series/499444/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2221786/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2221786/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","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 spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.234.253.10; helo=sea.lore.kernel.org;\n envelope-from=netfilter-devel+bounces-11806-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=91.216.245.30","smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=strlen.de","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=Chamillionaire.breakpoint.cc"],"Received":["from sea.lore.kernel.org (sea.lore.kernel.org [172.234.253.10])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fsZSN5C3Vz1yGS\n\tfor ; Fri, 10 Apr 2026 21:33:40 +1000 (AEST)","from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sea.lore.kernel.org (Postfix) with ESMTP id 7804330A9C60\n\tfor ; Fri, 10 Apr 2026 11:24:45 +0000 (UTC)","from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 558593A0E84;\n\tFri, 10 Apr 2026 11:24:43 +0000 (UTC)","from Chamillionaire.breakpoint.cc (Chamillionaire.breakpoint.cc\n [91.216.245.30])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id 1DFC31448E0;\n\tFri, 10 Apr 2026 11:24:40 +0000 (UTC)","by Chamillionaire.breakpoint.cc (Postfix, from userid 1003)\n\tid 836FE60C68; Fri, 10 Apr 2026 13:24:39 +0200 (CEST)"],"ARC-Seal":"i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1775820283; cv=none;\n b=gXDrgk13h7OxBE2/sXmwWPhZlpm+upLiJ8Gder9xxx2J1CKxE5yaiKG0EPUTE7lCQlltBicmrafqdrWnc7/2Zj8ZNkKVAuDPuWD/d7LynXRZ2UNp81bJ+i38T6Lqf31KS54CxDXMe94sibt1shGugmY2N9DaQe6Y0mzwMrUizjc=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1775820283; c=relaxed/simple;\n\tbh=74pLfbiC3+10J2yOI2W9lhehhyjzUrjwVtrtoFchtWQ=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=h7cez1trrtUmPIHcjyRxbOAicWZfWgytyO5cS43kHDh/RgWCMoC9keMmihl52WRlygbNfT1ZnvJIgGQoTZ82VN70AfQxI8tCYp6YzpNINKWto3EtmxfQgR2mBJgnmqjG6fVHnjoSPPTI6YFltlbVYdGEzcNpX097D/vpW8Mgo1k=","ARC-Authentication-Results":"i=1; smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=strlen.de;\n spf=pass smtp.mailfrom=Chamillionaire.breakpoint.cc;\n arc=none smtp.client-ip=91.216.245.30","From":"Florian Westphal ","To":"","Cc":"Paolo Abeni ,\n\t\"David S. Miller\" ,\n\tEric Dumazet ,\n\tJakub Kicinski ,\n\t,\n\tpablo@netfilter.org","Subject":"[PATCH net-next 10/11] netfilter: nft_fwd_netdev: check ttl/hl before\n forwarding","Date":"Fri, 10 Apr 2026 13:23:51 +0200","Message-ID":"<20260410112352.23599-11-fw@strlen.de>","X-Mailer":"git-send-email 2.52.0","In-Reply-To":"<20260410112352.23599-1-fw@strlen.de>","References":"<20260410112352.23599-1-fw@strlen.de>","Precedence":"bulk","X-Mailing-List":"netfilter-devel@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit"},"content":"Drop packets if their ttl/hl is too small for forwarding.\n\nFixes: d32de98ea70f (\"netfilter: nft_fwd_netdev: allow to forward packets via neighbour layer\")\nSigned-off-by: Florian Westphal \n---\n net/netfilter/nft_fwd_netdev.c | 10 ++++++++++\n 1 file changed, 10 insertions(+)","diff":"diff --git a/net/netfilter/nft_fwd_netdev.c b/net/netfilter/nft_fwd_netdev.c\nindex ad48dcd45abe..4bce36c3a6a0 100644\n--- a/net/netfilter/nft_fwd_netdev.c\n+++ b/net/netfilter/nft_fwd_netdev.c\n@@ -116,6 +116,11 @@ static void nft_fwd_neigh_eval(const struct nft_expr *expr,\n \t\t\tgoto out;\n \t\t}\n \t\tiph = ip_hdr(skb);\n+\t\tif (iph->ttl <= 1) {\n+\t\t\tverdict = NF_DROP;\n+\t\t\tgoto out;\n+\t\t}\n+\n \t\tip_decrease_ttl(iph);\n \t\tneigh_table = NEIGH_ARP_TABLE;\n \t\tbreak;\n@@ -132,6 +137,11 @@ static void nft_fwd_neigh_eval(const struct nft_expr *expr,\n \t\t\tgoto out;\n \t\t}\n \t\tip6h = ipv6_hdr(skb);\n+\t\tif (ip6h->hop_limit <= 1) {\n+\t\t\tverdict = NF_DROP;\n+\t\t\tgoto out;\n+\t\t}\n+\n \t\tip6h->hop_limit--;\n \t\tneigh_table = NEIGH_ND_TABLE;\n \t\tbreak;\n","prefixes":["net-next","10/11"]}