[{"id":3679371,"web_url":"http://patchwork.ozlabs.org/comment/3679371/","msgid":"","list_archive_url":null,"date":"2026-04-20T11:36:12","subject":"Re: [PATCH bpf-next v4 1/6] net: move netfilter\n nf_reject_fill_skb_dst to core ipv4","submitter":{"id":91980,"url":"http://patchwork.ozlabs.org/api/people/91980/","name":null,"email":"bot+bpf-ci@kernel.org"},"content":"> diff --git a/include/net/route.h b/include/net/route.h\n> index f90106f383c5..ec2466fd0bec 100644\n> --- a/include/net/route.h\n> +++ b/include/net/route.h\n> @@ -173,6 +173,7 @@ struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,\n> \t\t\t\t const struct sock *sk);\n> struct dst_entry *ipv4_blackhole_route(struct net *net,\n> \t\t\t\t struct dst_entry *dst_orig);\n> +int ip_route_reply_fetch_dst(struct sk_buff *skb);\n>\n> static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp)\n> {\n\n[ ... ]\n\n> diff --git a/net/ipv4/route.c b/net/ipv4/route.c\n> index bc1296f0ea69..7091ef936073 100644\n> --- a/net/ipv4/route.c\n> +++ b/net/ipv4/route.c\n> @@ -2945,6 +2945,21 @@ struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4,\n> }\n> EXPORT_SYMBOL_GPL(ip_route_output_flow);\n>\n> +int ip_route_reply_fetch_dst(struct sk_buff *skb)\n> +{\n> +\tstruct rtable *rt;\n> +\tstruct flowi4 fl4 = {\n> +\t\t.daddr = ip_hdr(skb)->saddr\n> +\t};\n> +\n> +\trt = ip_route_output_key(dev_net(skb->dev), &fl4);\n> +\tif (IS_ERR(rt))\n> +\t\treturn PTR_ERR(rt);\n> +\tskb_dst_set(skb, &rt->dst);\n> +\treturn 0;\n> +}\n> +EXPORT_SYMBOL_GPL(ip_route_reply_fetch_dst);\n\nIs ip_route_reply_fetch_dst() actually needed before calling icmp_send()?\n\nMartin KaFai Lau raised this question in v3 of the patch series and\nnoted that icmpv6_send() does its own route lookup and doesn't use\nskb_dst() of the original skb. He also pointed out that at\ncgroup/egress, skb->_skb_refdst should already be set.\n\nLooking at icmpv6_send(), the fl6.{daddr,saddr} are filled and passed\nto icmpv6_route_lookup, which performs the reverse/invert route lookup.\nThe function doesn't appear to use skb_dst() of the original skb.\n\nSince this patch moves ip_route_reply_fetch_dst() from netfilter to\ncore specifically for the BPF kfunc, can you clarify why this routing\nstep is necessary? Does the kfunc not work without\nip[6]_route_reply_fetch_dst()?\n\nReference: https://lore.kernel.org/bpf/df4b0996-3e88-4ea4-983b-82866455a6fc@linux.dev/\n\n\n---\nAI reviewed your patch. Please fix the bug or email reply why it's not a bug.\nSee: https://github.com/kernel-patches/vmtest/blob/master/ci/claude/README.md\n\nCI run summary: https://github.com/kernel-patches/bpf/actions/runs/24663313503","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\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=uem6msaO;\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-12046-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=\"uem6msaO\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=10.30.226.201"],"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 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fzk3P6jhfz1yD4\n\tfor ; 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boundary=\"===============0537590972006115725==\"","Precedence":"bulk","X-Mailing-List":"netfilter-devel@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Message-Id":"\n ","In-Reply-To":"<20260420105816.72168-2-mahe.tardy@gmail.com>","References":"<20260420105816.72168-2-mahe.tardy@gmail.com>","Subject":"Re: [PATCH bpf-next v4 1/6] net: move netfilter\n nf_reject_fill_skb_dst to core ipv4","From":"bot+bpf-ci@kernel.org","To":"mahe.tardy@gmail.com,mahe.tardy@gmail.com","Cc":"\n alexei.starovoitov@gmail.com,andrii@kernel.org,ast@kernel.org,bpf@vger.kernel.org,coreteam@netfilter.org,daniel@iogearbox.net,fw@strlen.de,john.fastabend@gmail.com,lkp@intel.com,martin.lau@linux.dev,netdev@vger.kernel.org,netfilter-devel@vger.kernel.org,oe-kbuild-all@lists.linux.dev,pablo@netfilter.org,ast@kernel.org,andrii@kernel.org,daniel@iogearbox.net,martin.lau@kernel.org,eddyz87@gmail.com,yonghong.song@linux.dev,clm@meta.com,ihor.solodrai@linux.dev","Date":"Mon, 20 Apr 2026 11:36:12 +0000 (UTC)"}},{"id":3679398,"web_url":"http://patchwork.ozlabs.org/comment/3679398/","msgid":"","list_archive_url":null,"date":"2026-04-20T13:04:52","subject":"Re: [PATCH bpf-next v4 1/6] net: move netfilter\n nf_reject_fill_skb_dst to core ipv4","submitter":{"id":91349,"url":"http://patchwork.ozlabs.org/api/people/91349/","name":"Mahe Tardy","email":"mahe.tardy@gmail.com"},"content":"On Mon, Apr 20, 2026 at 11:36:12AM +0000, bot+bpf-ci@kernel.org wrote:\n> > diff --git a/include/net/route.h b/include/net/route.h\n> > index f90106f383c5..ec2466fd0bec 100644\n> > --- a/include/net/route.h\n> > +++ b/include/net/route.h\n> > @@ -173,6 +173,7 @@ struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,\n> > \t\t\t\t const struct sock *sk);\n> > struct dst_entry *ipv4_blackhole_route(struct net *net,\n> > \t\t\t\t struct dst_entry *dst_orig);\n> > +int ip_route_reply_fetch_dst(struct sk_buff *skb);\n> >\n> > static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp)\n> > {\n> \n> [ ... ]\n> \n> > diff --git a/net/ipv4/route.c b/net/ipv4/route.c\n> > index bc1296f0ea69..7091ef936073 100644\n> > --- a/net/ipv4/route.c\n> > +++ b/net/ipv4/route.c\n> > @@ -2945,6 +2945,21 @@ struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4,\n> > }\n> > EXPORT_SYMBOL_GPL(ip_route_output_flow);\n> >\n> > +int ip_route_reply_fetch_dst(struct sk_buff *skb)\n> > +{\n> > +\tstruct rtable *rt;\n> > +\tstruct flowi4 fl4 = {\n> > +\t\t.daddr = ip_hdr(skb)->saddr\n> > +\t};\n> > +\n> > +\trt = ip_route_output_key(dev_net(skb->dev), &fl4);\n> > +\tif (IS_ERR(rt))\n> > +\t\treturn PTR_ERR(rt);\n> > +\tskb_dst_set(skb, &rt->dst);\n> > +\treturn 0;\n> > +}\n> > +EXPORT_SYMBOL_GPL(ip_route_reply_fetch_dst);\n> \n> Is ip_route_reply_fetch_dst() actually needed before calling icmp_send()?\n> \n> Martin KaFai Lau raised this question in v3 of the patch series and\n> noted that icmpv6_send() does its own route lookup and doesn't use\n> skb_dst() of the original skb. He also pointed out that at\n> cgroup/egress, skb->_skb_refdst should already be set.\n> \n> Looking at icmpv6_send(), the fl6.{daddr,saddr} are filled and passed\n> to icmpv6_route_lookup, which performs the reverse/invert route lookup.\n> The function doesn't appear to use skb_dst() of the original skb.\n> \n> Since this patch moves ip_route_reply_fetch_dst() from netfilter to\n> core specifically for the BPF kfunc, can you clarify why this routing\n> step is necessary? Does the kfunc not work without\n> ip[6]_route_reply_fetch_dst()?\n> \n> Reference: https://lore.kernel.org/bpf/df4b0996-3e88-4ea4-983b-82866455a6fc@linux.dev/\n\nYes I replied to this in the cover letter, let me quote it:\n\nInitially, this kfunc was added only to cgroup_skb programs, Alexei\nsuggested not creating its own kfunc set and adding it to the more\nglobal bpf_kfunc_set_skb. Now that recursion is handled and I realized,\nthanks to Martin, that fetching the dst route might be only useful in\nsituation in which the packet was not yet routed, I decided to extend\nthe kfunc to more program types and route the packet only if needed.\n\nSo in short, if we decide to go back to cgroup_skb only, we can remove\nthis, if we expand to other program types like we do, it still makes\nsense to do it.\n\n> \n> \n> ---\n> AI reviewed your patch. Please fix the bug or email reply why it's not a bug.\n> See: https://github.com/kernel-patches/vmtest/blob/master/ci/claude/README.md\n> \n> CI run summary: https://github.com/kernel-patches/bpf/actions/runs/24663313503","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\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=rnMPR1IF;\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-12049-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com\n header.b=\"rnMPR1IF\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=209.85.128.46","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=gmail.com"],"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 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fzm8S2qTFz1yD4\n\tfor ; Mon, 20 Apr 2026 23:11:20 +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 C6664312102E\n\tfor ; Mon, 20 Apr 2026 13:05:08 +0000 (UTC)","from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 502CF3A0B13;\n\tMon, 20 Apr 2026 13:05:03 +0000 (UTC)","from mail-wm1-f46.google.com (mail-wm1-f46.google.com\n [209.85.128.46])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id 5F2743A168B\n\tfor ; Mon, 20 Apr 2026 13:04:57 +0000 (UTC)","by mail-wm1-f46.google.com with SMTP id\n 5b1f17b1804b1-488b3f8fa2bso35206815e9.1\n for ;\n Mon, 20 Apr 2026 06:04:57 -0700 (PDT)","from gmail.com (deskosmtp.auranext.com. 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