{"id":2221389,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2221389/?format=json","web_url":"http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260409113414.5800-1-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":"<20260409113414.5800-1-fw@strlen.de>","list_archive_url":null,"date":"2026-04-09T11:34:09","name":"[nf-next] netfilter: nft_fwd_netdev: check ttl/hl before forwarding","commit_ref":null,"pull_url":null,"state":"accepted","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/20260409113414.5800-1-fw@strlen.de/mbox/","series":[{"id":499278,"url":"http://patchwork.ozlabs.org/api/1.2/series/499278/?format=json","web_url":"http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=499278","date":"2026-04-09T11:34:09","name":"[nf-next] netfilter: nft_fwd_netdev: check ttl/hl before forwarding","version":1,"mbox":"http://patchwork.ozlabs.org/series/499278/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2221389/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2221389/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-11761-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 4fryWv2lmZz1xy1\n\tfor ; Thu, 09 Apr 2026 21:34:35 +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 583D6301A711\n\tfor ; Thu, 9 Apr 2026 11:34:24 +0000 (UTC)","from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id BED1B3B47D7;\n\tThu, 9 Apr 2026 11:34:23 +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 169863A9605\n\tfor ; Thu, 9 Apr 2026 11:34:21 +0000 (UTC)","by Chamillionaire.breakpoint.cc (Postfix, from userid 1003)\n\tid B780360636; Thu, 09 Apr 2026 13:34:19 +0200 (CEST)"],"ARC-Seal":"i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1775734463; cv=none;\n b=JIeugEQfAsgK5DpmIgy8we9jNvSS3aDwhw7ugHKe/CK004y16sJlNumbvOcNfUGWyirfPwFM3AIjJvt3bxn/OTdVZTbTxGQHWJIzEyqunQ//sBZCmozgdKmVltiHQ0hbuVG1S3zmjlxfzDyQ2CwH5sesMX4XCfb1OC1E86ywDbA=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1775734463; c=relaxed/simple;\n\tbh=+a511TALgLeqqdMEIBAs3WNphGKFqiU3hbVlYwW0ZRs=;\n\th=From:To:Cc:Subject:Date:Message-ID:MIME-Version;\n b=Y/ubsBmpbwsqsxFTmrUNTgVAPfDE9QW45LtoVN7lcrb2XTjWbQUwIXvp00QP7PjxJ7vBiPbYNK9hLUPbttPDInS+gLikfWB2MBqjTZpE2d1Kl5eH4+Y6K7j8gv+MZWoHuvn8L9MhEnuVFvQcABY++Rq8Rzheb6mR5XA8YstzvvI=","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":"Florian Westphal ","Subject":"[PATCH nf-next] netfilter: nft_fwd_netdev: check ttl/hl before\n forwarding","Date":"Thu, 9 Apr 2026 13:34:09 +0200","Message-ID":"<20260409113414.5800-1-fw@strlen.de>","X-Mailer":"git-send-email 2.52.0","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 5804609c63ab..fb3a84dc7bd9 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":["nf-next"]}