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GET /api/patches/2226128/?format=api
{ "id": 2226128, "url": "http://patchwork.ozlabs.org/api/patches/2226128/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260422094444.198178-1-pablo@netfilter.org/", "project": { "id": 26, "url": "http://patchwork.ozlabs.org/api/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, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260422094444.198178-1-pablo@netfilter.org>", "list_archive_url": null, "date": "2026-04-22T09:44:42", "name": "[nf,v2,1/3] netfilter: replace skb_try_make_writable() by skb_ensure_writable()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "4c7b4e615607238b50255145f5316bc09b21a6fa", "submitter": { "id": 1315, "url": "http://patchwork.ozlabs.org/api/people/1315/?format=api", "name": "Pablo Neira Ayuso", "email": "pablo@netfilter.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260422094444.198178-1-pablo@netfilter.org/mbox/", "series": [ { "id": 500956, "url": "http://patchwork.ozlabs.org/api/series/500956/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=500956", "date": "2026-04-22T09:44:43", "name": "[nf,v2,1/3] netfilter: replace skb_try_make_writable() by skb_ensure_writable()", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/500956/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2226128/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2226128/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <netfilter-devel+bounces-12124-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=netfilter.org header.i=@netfilter.org\n header.a=rsa-sha256 header.s=2025 header.b=GsWv3p5t;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=netfilter-devel+bounces-12124-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)", "smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=netfilter.org header.i=@netfilter.org\n header.b=\"GsWv3p5t\"", "smtp.subspace.kernel.org;\n arc=none smtp.client-ip=217.70.190.124", "smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=netfilter.org", "smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=netfilter.org" ], "Received": [ "from sea.lore.kernel.org (sea.lore.kernel.org\n [IPv6:2600:3c0a:e001:db::12fc:5321])\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 4g0vdn3WhPz1yD5\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 22 Apr 2026 19:52:13 +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 89E9A307BB0A\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 22 Apr 2026 09:44:53 +0000 (UTC)", "from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 91E9E3BFE3E;\n\tWed, 22 Apr 2026 09:44:52 +0000 (UTC)", "from mail.netfilter.org (mail.netfilter.org [217.70.190.124])\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 5CFED329E79\n\tfor <netfilter-devel@vger.kernel.org>; Wed, 22 Apr 2026 09:44:50 +0000 (UTC)", "from localhost.localdomain (mail-agni [217.70.190.124])\n\tby mail.netfilter.org (Postfix) with ESMTPSA id 8F6D5600B9\n\tfor <netfilter-devel@vger.kernel.org>; Wed, 22 Apr 2026 11:44:48 +0200 (CEST)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1776851092; cv=none;\n b=Db9zWLJyOKsY/E4Bw2oEbk3hk2isfIpBoNm5eEyrMANW5JjDdkz6hZ6kLgXnzebrab4x4waMvBrhY5iHGZu20P5C1wiRq9NB7uPFrhK0XExnh7EJu8MSkwe4cMwkA1Cp7gnm2sNAR1v6l/iI6fzh+0WbKUE9TD9ueieMtT5RIxc=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1776851092; c=relaxed/simple;\n\tbh=SwwR4LLGQ9t/T+Zx6MQR9NAQu4Rl7qqkiCWkkk8W+7U=;\n\th=From:To:Subject:Date:Message-ID:MIME-Version;\n b=mxT3BIct1snN/6gE2v71rkqlFAEEEnLs2pZz++n6Thc6gRgXY7jsWJH24zNcLgmqwwnXZbcBtag5jyo7dAppf8Ea+oqr/3d55xc4f0n+k4wVCJ1CaZwy+gq2b8Ib+ZYZeNi9yZ0dG8DrrbU9GbXpNu4HW8NUIrV3AX9Hrt6QFoQ=", "ARC-Authentication-Results": "i=1; smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=netfilter.org;\n spf=pass smtp.mailfrom=netfilter.org;\n dkim=pass (2048-bit key) header.d=netfilter.org header.i=@netfilter.org\n header.b=GsWv3p5t; arc=none smtp.client-ip=217.70.190.124", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=netfilter.org;\n\ts=2025; t=1776851088;\n\tbh=C9X1uafuiWZLMlltcrL5HhxfZLBVc7P5ipF+/AJdayA=;\n\th=From:To:Subject:Date:From;\n\tb=GsWv3p5tKOmLM+tlph9d952wgVqd9l2zn/5IRMEeNBtsQaWwq04P3ttkzoDdjsAF0\n\t zDr4t17nLur2lABdR+zJW/n/GcH3sZr7bJuiYZoSdnyKCh45t9Ckdh/CDHKKxhWZ11\n\t qsyRpardquUOTx034fPSN26pv7vjXQ7oY86n3yZlpSmZe0a5Z79Nt9Y+LRnQBlGtQT\n\t djIWZ4LbGGzIrJC/gFULSScAmLKKEBQNa37WA/8zExMWfCE7TYd1tXSAHWZBG4r5zm\n\t Q+cOu/IpDONzs3U0jEUkAeYlnyp7oiSdyHpEIk8pOj9PMM1cmYofX7/U+/2RfLJfEX\n\t IX6sDXjCxOlNQ==", "From": "Pablo Neira Ayuso <pablo@netfilter.org>", "To": "netfilter-devel@vger.kernel.org", "Subject": "[PATCH nf,v2 1/3] netfilter: replace skb_try_make_writable() by\n skb_ensure_writable()", "Date": "Wed, 22 Apr 2026 11:44:42 +0200", "Message-ID": "<20260422094444.198178-1-pablo@netfilter.org>", "X-Mailer": "git-send-email 2.47.3", "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": "skb_try_make_writable() only works on clones and uncloned packets might\nhave their network header in paged fragments.\n\nnft_fwd needs to work for the ingress and egress hooks, but the egress\nhook where skb->data points to the mac header, use skb_network_offset()\nto deal include the mac header. The flowtable path only works in the\ningress hook, it does not need this same handling as nft_fwd does.\n\nFixes: d32de98ea70f (\"netfilter: nft_fwd_netdev: allow to forward packets via neighbour layer\")\nFixes: 7d2086871762 (\"netfilter: nf_flow_table: move ipv4 offload hook code to nf_flow_table\")\nSigned-off-by: Pablo Neira Ayuso <pablo@netfilter.org>\n---\nv2: - update ipv6 flowtable forwarding too to use skb_ensure_writable()\n - add skb_network_offset() to include mac header in nft_fwd so this\n works for egress path too.\n\n net/netfilter/nf_flow_table_ip.c | 4 ++--\n net/netfilter/nft_fwd_netdev.c | 5 +++--\n 2 files changed, 5 insertions(+), 4 deletions(-)", "diff": "diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c\nindex fd56d663cb5b..dbd7644fdbeb 100644\n--- a/net/netfilter/nf_flow_table_ip.c\n+++ b/net/netfilter/nf_flow_table_ip.c\n@@ -524,7 +524,7 @@ static int nf_flow_offload_forward(struct nf_flowtable_ctx *ctx,\n \t\treturn 0;\n \t}\n \n-\tif (skb_try_make_writable(skb, thoff + ctx->hdrsize))\n+\tif (skb_ensure_writable(skb, thoff + ctx->hdrsize))\n \t\treturn -1;\n \n \tflow_offload_refresh(flow_table, flow, false);\n@@ -1037,7 +1037,7 @@ static int nf_flow_offload_ipv6_forward(struct nf_flowtable_ctx *ctx,\n \t\treturn 0;\n \t}\n \n-\tif (skb_try_make_writable(skb, thoff + ctx->hdrsize))\n+\tif (skb_ensure_writable(skb, thoff + ctx->hdrsize))\n \t\treturn -1;\n \n \tflow_offload_refresh(flow_table, flow, false);\ndiff --git a/net/netfilter/nft_fwd_netdev.c b/net/netfilter/nft_fwd_netdev.c\nindex 4bce36c3a6a0..516287ce7f9b 100644\n--- a/net/netfilter/nft_fwd_netdev.c\n+++ b/net/netfilter/nft_fwd_netdev.c\n@@ -98,6 +98,7 @@ static void nft_fwd_neigh_eval(const struct nft_expr *expr,\n \tstruct nft_fwd_neigh *priv = nft_expr_priv(expr);\n \tvoid *addr = ®s->data[priv->sreg_addr];\n \tint oif = regs->data[priv->sreg_dev];\n+\tint nhoff = skb_network_offset(skb);\n \tunsigned int verdict = NF_STOLEN;\n \tstruct sk_buff *skb = pkt->skb;\n \tstruct net_device *dev;\n@@ -111,7 +112,7 @@ static void nft_fwd_neigh_eval(const struct nft_expr *expr,\n \t\t\tverdict = NFT_BREAK;\n \t\t\tgoto out;\n \t\t}\n-\t\tif (skb_try_make_writable(skb, sizeof(*iph))) {\n+\t\tif (skb_ensure_writable(skb, nhoff + sizeof(*iph))) {\n \t\t\tverdict = NF_DROP;\n \t\t\tgoto out;\n \t\t}\n@@ -132,7 +133,7 @@ static void nft_fwd_neigh_eval(const struct nft_expr *expr,\n \t\t\tverdict = NFT_BREAK;\n \t\t\tgoto out;\n \t\t}\n-\t\tif (skb_try_make_writable(skb, sizeof(*ip6h))) {\n+\t\tif (skb_ensure_writable(skb, nhoff + sizeof(*ip6h))) {\n \t\t\tverdict = NF_DROP;\n \t\t\tgoto out;\n \t\t}\n", "prefixes": [ "nf", "v2", "1/3" ] }