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GET /api/1.1/patches/2229026/?format=api
{ "id": 2229026, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2229026/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260427171408.23018-1-pablo@netfilter.org/", "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": "<20260427171408.23018-1-pablo@netfilter.org>", "date": "2026-04-27T17:14:07", "name": "[nf,v2,1/2] netfilter: flowtable: fix inline vlan encapsulation in xmit path", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "12dec5c3934eaa1175b0a61136a1ea02aef984a7", "submitter": { "id": 1315, "url": "http://patchwork.ozlabs.org/api/1.1/people/1315/?format=api", "name": "Pablo Neira Ayuso", "email": "pablo@netfilter.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260427171408.23018-1-pablo@netfilter.org/mbox/", "series": [ { "id": 501690, "url": "http://patchwork.ozlabs.org/api/1.1/series/501690/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=501690", "date": "2026-04-27T17:14:08", "name": "[nf,v2,1/2] netfilter: flowtable: fix inline vlan encapsulation in xmit path", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/501690/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2229026/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2229026/checks/", "tags": {}, "headers": { "Return-Path": "\n <netfilter-devel+bounces-12225-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=do7JGdZM;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.234.253.10; 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Mon, 27 Apr 2026 17:14:28 +0000 (UTC)", "from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id A3E763E1227;\n\tMon, 27 Apr 2026 17:14:22 +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 396283E121A\n\tfor <netfilter-devel@vger.kernel.org>; Mon, 27 Apr 2026 17:14:14 +0000 (UTC)", "from localhost.localdomain (mail-agni [217.70.190.124])\n\tby mail.netfilter.org (Postfix) with ESMTPSA id 5E20360178\n\tfor <netfilter-devel@vger.kernel.org>; Mon, 27 Apr 2026 19:14:12 +0200 (CEST)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1777310059; cv=none;\n b=DqhPBh23g986aI+jgLjMxao3wHNM2PyGGKWQNAN0T0qRrLtjuLV86zV5bEp0bi1sfmcTepG2SVpQ72e8icTlEN7a8NCE1o2FNAdaCnteJf6Va/8lYQAvoxuA6J0uzR/yhTnTRwJeetVML0bKnd4z0U9EWDn6NuuV5md64Q53TQk=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1777310059; c=relaxed/simple;\n\tbh=c8qwr8hpFSAA7XPdf4vQwky8AsTs0mQgsbBp4jyBNg8=;\n\th=From:To:Subject:Date:Message-ID:MIME-Version;\n b=XKJkWkye2vP4jiNK/SDC6wNmBcEtSubknuBBNjvifjHJf8GtLDfoubQZW7YBG4ATHjcPweN8trzlIlvzKd+ehfSS5djqIbVHm+x0U403gLLT+vwa0YdWp4oWpjru1rgn5l6ndNNZ1KsbXFJrf5WpXle0g2vHQ8CU/HS6C1PAhJA=", "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=do7JGdZM; 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=1777310052;\n\tbh=nVUcpAc9NDYqUyTn6N1pBijEFa49qXFuRs+jcZ+rG98=;\n\th=From:To:Subject:Date:From;\n\tb=do7JGdZMwniM8yPEVNeaNcWBem/Bui5hE/7JuVSI6IxvImJNU7ZiYM9wLGHs4TNhc\n\t CaxvCEK/iMeLWhi4hRRcfxXBs39vNv/TxeKyqanUIKy0qxDHQrQOaAmU1s6GTy6fip\n\t rP7g8fE4DRGMfMBtnqNAikm59ybQ68h1M5iyVPnvz1mMuVpDvNxp9NfmFA4AOD2gA4\n\t 81PGR50pf3VpuE1VqIVOXKU59XZ5ji9eYQ4ceQOULq9B2z4sYJWX8gEca+zpUtCfna\n\t vJWsn/ZnAehQsNaotq4fAeqCIlaus70H6883Tjb1RwT2I0FDTMlzBu+0ubWwQsyAB6\n\t nw762apCYfltQ==", "From": "Pablo Neira Ayuso <pablo@netfilter.org>", "To": "netfilter-devel@vger.kernel.org", "Subject": "[PATCH nf,v2 1/2] netfilter: flowtable: fix inline vlan encapsulation\n in xmit path", "Date": "Mon, 27 Apr 2026 19:14:07 +0200", "Message-ID": "<20260427171408.23018-1-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": "Several issues in the inline vlan support:\n\n- The layer 2 encapsulation representation in the tuple takes encap[0] as\n the outer header and encap[1] as the inner header as seen from the ingress\n path. Reverse the encap loop to push first the inner then the outer vlan\n header.\n\n- Postpone pushing the layer 2 header once destination device is known.\n This allows to calculate the needed hearoom via LL_RESERVED_SPACE to\n accommodate the layer 2 headers.\n\n- Add and use nf_flow_vlan_push() as suggested by Eric Woudstra, this\n is a simplified version of skb_vlan_push() for egress path only.\n\nFixes: c653d5a78f34 (\"netfilter: flowtable: inline vlan encapsulation in xmit path\")\nSigned-off-by: Pablo Neira Ayuso <pablo@netfilter.org>\n---\nv2: no changes.\n\nSeverals comments for AI:\n\n- This is catching skbuffs from ingress, skb->data points to network\n header. The existing mac header from ingress can be overwritten\n when xmitting packets to the egress path.\n- skb->network_header is updated to point to the VLAN header with\n double-tagged VLAN as usual.\n\n net/netfilter/nf_flow_table_ip.c | 91 ++++++++++++++++++++++----------\n 1 file changed, 63 insertions(+), 28 deletions(-)", "diff": "diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c\nindex dbd7644fdbeb..6da0bc3965df 100644\n--- a/net/netfilter/nf_flow_table_ip.c\n+++ b/net/netfilter/nf_flow_table_ip.c\n@@ -462,23 +462,6 @@ static void nf_flow_encap_pop(struct nf_flowtable_ctx *ctx,\n \t\tnf_flow_ip_tunnel_pop(ctx, skb);\n }\n \n-struct nf_flow_xmit {\n-\tconst void\t\t*dest;\n-\tconst void\t\t*source;\n-\tstruct net_device\t*outdev;\n-};\n-\n-static unsigned int nf_flow_queue_xmit(struct net *net, struct sk_buff *skb,\n-\t\t\t\t struct nf_flow_xmit *xmit)\n-{\n-\tskb->dev = xmit->outdev;\n-\tdev_hard_header(skb, skb->dev, ntohs(skb->protocol),\n-\t\t\txmit->dest, xmit->source, skb->len);\n-\tdev_queue_xmit(skb);\n-\n-\treturn NF_STOLEN;\n-}\n-\n static struct flow_offload_tuple_rhash *\n nf_flow_offload_lookup(struct nf_flowtable_ctx *ctx,\n \t\t struct nf_flowtable *flow_table, struct sk_buff *skb)\n@@ -544,6 +527,31 @@ static int nf_flow_offload_forward(struct nf_flowtable_ctx *ctx,\n \treturn 1;\n }\n \n+/* Similar to skb_vlan_push. */\n+static int nf_flow_vlan_push(struct sk_buff *skb, __be16 proto, u16 id,\n+\t\t\t u32 needed_headroom)\n+{\n+\tif (skb_vlan_tag_present(skb)) {\n+\t\tstruct vlan_hdr *vhdr;\n+\n+\t\tif (skb_cow_head(skb, needed_headroom + VLAN_HLEN))\n+\t\t\treturn -1;\n+\n+\t\t__skb_push(skb, VLAN_HLEN);\n+\t\tif (skb_mac_header_was_set(skb))\n+\t\t\tskb->mac_header -= VLAN_HLEN;\n+\n+\t\tvhdr = (struct vlan_hdr *)skb->data;\n+\t\tskb->network_header -= VLAN_HLEN;\n+\t\tvhdr->h_vlan_TCI = htons(skb_vlan_tag_get(skb));\n+\t\tvhdr->h_vlan_encapsulated_proto = skb->protocol;\n+\t\tskb->protocol = skb->vlan_proto;\n+\t}\n+\t__vlan_hwaccel_put_tag(skb, proto, id);\n+\n+\treturn 0;\n+}\n+\n static int nf_flow_pppoe_push(struct sk_buff *skb, u16 id)\n {\n \tint data_len = skb->len + sizeof(__be16);\n@@ -730,17 +738,19 @@ static int nf_flow_tunnel_v6_push(struct net *net, struct sk_buff *skb,\n }\n \n static int nf_flow_encap_push(struct sk_buff *skb,\n-\t\t\t struct flow_offload_tuple *tuple)\n+\t\t\t struct flow_offload_tuple *tuple,\n+\t\t\t struct net_device *outdev)\n {\n+\tu32 needed_headroom = LL_RESERVED_SPACE(outdev);\n \tint i;\n \n-\tfor (i = 0; i < tuple->encap_num; i++) {\n+\tfor (i = tuple->encap_num - 1; i >= 0; i--) {\n \t\tswitch (tuple->encap[i].proto) {\n \t\tcase htons(ETH_P_8021Q):\n \t\tcase htons(ETH_P_8021AD):\n-\t\t\tskb_reset_mac_header(skb);\n-\t\t\tif (skb_vlan_push(skb, tuple->encap[i].proto,\n-\t\t\t\t\t tuple->encap[i].id) < 0)\n+\t\t\tif (nf_flow_vlan_push(skb, tuple->encap[i].proto,\n+\t\t\t\t\t tuple->encap[i].id,\n+\t\t\t\t\t needed_headroom) < 0)\n \t\t\t\treturn -1;\n \t\t\tbreak;\n \t\tcase htons(ETH_P_PPP_SES):\n@@ -753,6 +763,35 @@ static int nf_flow_encap_push(struct sk_buff *skb,\n \treturn 0;\n }\n \n+struct nf_flow_xmit {\n+\tconst void\t\t*dest;\n+\tconst void\t\t*source;\n+\tstruct net_device\t*outdev;\n+\tstruct flow_offload_tuple *tuple;\n+};\n+\n+static void __nf_flow_queue_xmit(struct net *net, struct sk_buff *skb,\n+\t\t\t\t struct nf_flow_xmit *xmit)\n+{\n+\tskb->dev = xmit->outdev;\n+\tdev_hard_header(skb, skb->dev, ntohs(skb->protocol),\n+\t\t\txmit->dest, xmit->source, skb->len);\n+\tdev_queue_xmit(skb);\n+}\n+\n+static unsigned int nf_flow_queue_xmit(struct net *net, struct sk_buff *skb,\n+\t\t\t\t struct nf_flow_xmit *xmit)\n+{\n+\tif (xmit->tuple->encap_num) {\n+\t\tif (nf_flow_encap_push(skb, xmit->tuple, xmit->outdev) < 0)\n+\t\t\treturn NF_DROP;\n+\t}\n+\n+\t__nf_flow_queue_xmit(net, skb, xmit);\n+\n+\treturn NF_STOLEN;\n+}\n+\n unsigned int\n nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,\n \t\t\tconst struct nf_hook_state *state)\n@@ -797,9 +836,6 @@ nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,\n \tif (nf_flow_tunnel_v4_push(state->net, skb, other_tuple, &ip_daddr) < 0)\n \t\treturn NF_DROP;\n \n-\tif (nf_flow_encap_push(skb, other_tuple) < 0)\n-\t\treturn NF_DROP;\n-\n \tswitch (tuplehash->tuple.xmit_type) {\n \tcase FLOW_OFFLOAD_XMIT_NEIGH:\n \t\trt = dst_rtable(tuplehash->tuple.dst_cache);\n@@ -829,6 +865,7 @@ nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,\n \t\tWARN_ON_ONCE(1);\n \t\treturn NF_DROP;\n \t}\n+\txmit.tuple = other_tuple;\n \n \treturn nf_flow_queue_xmit(state->net, skb, &xmit);\n }\n@@ -1119,9 +1156,6 @@ nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,\n \t\t\t\t &ip6_daddr, encap_limit) < 0)\n \t\treturn NF_DROP;\n \n-\tif (nf_flow_encap_push(skb, other_tuple) < 0)\n-\t\treturn NF_DROP;\n-\n \tswitch (tuplehash->tuple.xmit_type) {\n \tcase FLOW_OFFLOAD_XMIT_NEIGH:\n \t\trt = dst_rt6_info(tuplehash->tuple.dst_cache);\n@@ -1151,6 +1185,7 @@ nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,\n \t\tWARN_ON_ONCE(1);\n \t\treturn NF_DROP;\n \t}\n+\txmit.tuple = other_tuple;\n \n \treturn nf_flow_queue_xmit(state->net, skb, &xmit);\n }\n", "prefixes": [ "nf", "v2", "1/2" ] }