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(2001-1c00-020d-1300-1b1c-4449-176a-89ea.cable.dynamic.v6.ziggo.nl. [2001:1c00:20d:1300:1b1c:4449:176a:89ea]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ae6e82962acsm292076666b.139.2025.07.11.05.55.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 11 Jul 2025 05:55:20 -0700 (PDT) Message-ID: <6e12178f-e5f8-4202-948b-bdc421d5a361@gmail.com> Date: Fri, 11 Jul 2025 14:55:19 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v14 nf-next 3/3] netfilter: nft_chain_filter: Add bridge double vlan and pppoe To: Florian Westphal Cc: Pablo Neira Ayuso , Jozsef Kadlecsik , Nikolay Aleksandrov , Ido Schimmel , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , netfilter-devel@vger.kernel.org, bridge@lists.linux.dev, netdev@vger.kernel.org References: <20250708151209.2006140-1-ericwouds@gmail.com> <20250708151209.2006140-4-ericwouds@gmail.com> Content-Language: en-US From: Eric Woudstra In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 7/9/25 12:02 AM, Florian Westphal wrote: > Eric Woudstra wrote: >> + if (!pskb_may_pull(skb, VLAN_HLEN)) >> + break; >> + vhdr = (struct vlan_hdr *)(skb->data); >> + offset = VLAN_HLEN; >> + outer_proto = skb->protocol; >> + proto = vhdr->h_vlan_encapsulated_proto; >> + skb_set_network_header(skb, offset); >> + skb->protocol = proto; > > Why is skb->protocol munged? Also applies to the previous patch, > I forgot to ask. In the previous patch in nf_ct_bridge_pre(), indeed, no need to munge skb->protocol. So I'll change that. But in nft_do_chain_bridge() it is needed in the case of matching 'ip saddr', 'ip daddr', 'ip6 saddr' or 'ip6 daddr'. I suspect all ip/ip6 matches are suffering. So still matching is something like: tcp dport 8080 counter name "check" But no match when: ip saddr 192.168.1.1 tcp dport 8080 counter name "check" After munging skb->protocol, I do get the match. I haven't found where yet, but It seems nft is checking skb->protocol, before it tries to match the ip(6) saddr/daddr. And to answer a question in the other patch: this issue is found by using my script bridge_fastpath.sh. It first checks the connection, conntrack and nft-chain are functional in all testcases. So, it tests the functionality of the patches in this patch-set. I want to improve the script on a few more issues and then send a non-rfc.