From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ej1-f51.google.com (mail-ej1-f51.google.com [209.85.218.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B84D4C2FB for ; Tue, 4 Nov 2025 19:15:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.51 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762283758; cv=none; b=lvwOtBkVtIt0ScLcUAwAU45na0DrhRf/GBN4zUkJ+/the0+bEqeNZ8afd9i738ZEWoBPuM9LmusshlHCVOF2cxWpmUVkYY8ddi915PD19BAQ77nww0zEEkp/TbuqBOO0HGNyo0sR4zRbGRprQN3Mbgq+admcpuA76UGhNEft56I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762283758; c=relaxed/simple; bh=7S8+vO3ASy53c9/QMBRYjqmZUqwJy9+RRobBAyVghQ4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=B3gyHydg7SFF8fctcgwFKUqvYheM/krkSUjCLJ/AoM50wbcyNlrq/KAngT7D9ZssHgjZ8Ex3E4XEwCt+YiOOtJO8Ue0OQ4KGHcAQ3yjDZmeOpamPfqD97XCrkOed7DdWEmHgBjX6kgfEr6r+tO9crSPFq280P+yX7IT+Loxx9t4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Tted8uOH; arc=none smtp.client-ip=209.85.218.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Tted8uOH" Received: by mail-ej1-f51.google.com with SMTP id a640c23a62f3a-b5e19810703so795224866b.2 for ; Tue, 04 Nov 2025 11:15:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1762283755; x=1762888555; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:content-language:from :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=0QMyfynSbIJu4PvSuals8RhlA+Y6TdmVDUTrRaQq4u0=; b=Tted8uOHUyq8Y3gfRjdnFf8UCc9v3+0jHMdlUyTqyvldEB081s3sJAD52jD9wepwOY ROP/gJfXC2DduCpLJGI5NvUKt+29w9699rlhPHF4vch7k7ccQcgT35+RBppqaQWWlqup 03J2mSgLNgJ7J/qypBh8cIza4yZkowpjG/Rj+3t9lPkqaZCPmbKvVnemIlirJ5KDUMMl X2bLr/YH1QKErqEp8L3kSOOawCAjuwFp4nXi/n0h+dXnRm6jq3d6SEoVyZ3rxEEBFZXL 21VqdgSs77qylaIFwQOElpoYrPcMUl/qf5m0dym8biyBQl7sOBcL6AhMRsVGArVX+e/a nKrA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762283755; x=1762888555; h=content-transfer-encoding:in-reply-to:content-language:from :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=0QMyfynSbIJu4PvSuals8RhlA+Y6TdmVDUTrRaQq4u0=; b=PBzyVqn0709M/HAW9NJ6RLwt676j3bRUtP7R9mmHJ1+L/PGSNRX/bvVVJYZJUGWhvQ yUf4dhvmZI5qp7HlBFCNG8pCnV1OoiKIj0QJadkt4V49qXz+ZqvisMOYgbvswOq/QX8x nIclVfuQg/Qdv4NsJzPj5Uq8lbxpulrrb3rI1U1zdBQgWBqdDQoS+e0AlFfIulUnoVDF Cpv5xyd2PBJxBGUcUDhFBb07K29b5Gp8n7Rub3S6Yn9BrJksLabarp/SBOY/dirRWv09 60wSzZOgu9AG3jNl3k3RJ8iaHQCTXvY+aBSUBlNN2R0oJyhQl9qicyqzu/8Tf+rqLN3O K+uw== X-Forwarded-Encrypted: i=1; AJvYcCVQJzXQ2t6GhLbD9n3dXmbVCFKXfYmPcgpFpMNQ8PhPpAdyU2TPPSgG7BWFFbUa1vLOkyLErVU=@vger.kernel.org X-Gm-Message-State: AOJu0Yyz6n640Da+WNltQixv5eah/lNQ8aHBCtyzYYb5lOqlKp7CS4Jh F/+jh0apAOlRq4hXb/rtJN0d1JbxOJPNHRItmhn4FvAUZposnH3fpKVJTtx3gA== X-Gm-Gg: ASbGncs3LgD55Gxy9ROUh6QYzQD3pPCZSq8f6UheoQArcXP8zGxXsy+SPSVvFij2k2p PlN0W1WhvoEcsp2Wbargwwe7vnaV1rFqG73XnYtftU99jWckZ3A25Bya2+g9oyXiDl5frRdA6dk ph3TFarv4e1qiAUetqKy371XGu/XCqSl+ViYeTcXfKdh5M4BJ1sPIFMKK7eO5sNBdO7MkBzPN/Z jA/UyVL93rsMRuDAPWMXDIq/4h7MPG+S5hXBeXTMugdbU0r/P5W/ZHvnDoipvdmJK1OQxojzEnJ d0v51GZpevwxvY+SAdvj6YMNiuigUfN/OOqg3kurAUQpFEFW9hIb5N6JHId1q7dLz9ZBN3iWk0R KKKTby1rtIXcjk1FakkGepYAzrHHS9kQWSFFwMOhwTc8TGYMWq/0O9CZ6wSuCkPdBnFrVdIOwzw L+cPx0fc6AQvNbC/bTNX71c441am06ltmv3iqW29Z8eMhS/ZQTxVzYWrV31Vn8BshGz6Ya7HbH2 Pr79TGrxrvoCVL31DQcUptOWwDIItPZ1hEwt9l6XskKhm5LTpBWEQ== X-Google-Smtp-Source: AGHT+IGKnATGAMZLZ7BfrzK+rb/mjrrF2BjsXgKd9+vxecCJZWw7vzWEChRRFBgO1QfKEyIV7kI6LA== X-Received: by 2002:a17:907:6d0c:b0:b3f:5049:9e81 with SMTP id a640c23a62f3a-b726554c6fbmr23752866b.47.1762283754795; Tue, 04 Nov 2025 11:15:54 -0800 (PST) Received: from ?IPV6:2001:1c00:20d:1300:1b1c:4449:176a:89ea? (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-b723d3a336asm290222766b.7.2025.11.04.11.15.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 04 Nov 2025 11:15:54 -0800 (PST) Message-ID: <114f0b33-2c5f-4ae8-8ed8-e8bc7ef3dd2c@gmail.com> Date: Tue, 4 Nov 2025 20:15:51 +0100 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 v16 nf-next 3/3] netfilter: nft_chain_filter: Add bridge double vlan and pppoe To: Florian Westphal Cc: Pablo Neira Ayuso , Jozsef Kadlecsik , Phil Sutter , 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: <20251104145728.517197-1-ericwouds@gmail.com> <20251104145728.517197-4-ericwouds@gmail.com> From: Eric Woudstra Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/4/25 4:53 PM, Florian Westphal wrote: > Eric Woudstra wrote: >> + switch (*proto) { >> + case htons(ETH_P_PPP_SES): { >> + struct ppp_hdr { >> + struct pppoe_hdr hdr; >> + __be16 proto; >> + } *ph; >> + >> + if (!pskb_may_pull(skb, PPPOE_SES_HLEN)) >> + return -1; >> + ph = (struct ppp_hdr *)(skb->data); >> + switch (ph->proto) { >> + case htons(PPP_IP): >> + *proto = htons(ETH_P_IP); >> + skb_set_network_header(skb, PPPOE_SES_HLEN); >> + return PPPOE_SES_HLEN; >> + case htons(PPP_IPV6): >> + *proto = htons(ETH_P_IPV6); >> + skb_set_network_header(skb, PPPOE_SES_HLEN); >> + return PPPOE_SES_HLEN; >> + } >> + break; >> + } >> + case htons(ETH_P_8021Q): { >> + struct vlan_hdr *vhdr; >> + >> + if (!pskb_may_pull(skb, VLAN_HLEN)) >> + return -1; >> + vhdr = (struct vlan_hdr *)(skb->data); >> + *proto = vhdr->h_vlan_encapsulated_proto; >> + skb_set_network_header(skb, VLAN_HLEN); >> + return VLAN_HLEN; >> + } >> + } >> + return 0; >> +} >> + >> static unsigned int >> nft_do_chain_bridge(void *priv, >> struct sk_buff *skb, >> const struct nf_hook_state *state) >> { >> struct nft_pktinfo pkt; >> + __be16 proto; >> + int offset; >> >> - nft_set_pktinfo(&pkt, skb, state); >> + proto = eth_hdr(skb)->h_proto; >> >> - switch (eth_hdr(skb)->h_proto) { >> + offset = nft_set_bridge_pktinfo(&pkt, skb, state, &proto); >> + if (offset < 0) >> + return NF_ACCEPT; > > > Hmm. I'm not sure, I think this should either drop them right away > OR pass them to do_chain without any changes (i.e. retain existing > behavior and have this be same as nft_set_pktinfo_unspec()). > > but please wait until resend. > > I hope to finish a larger set i've been working on by tomorrow. > Then I can give this a more thorough review (and also make a summary + > suggestion wrt. the bridge match semantics wrt. vlan + pppoe etc. > > My hunch is that your approach is pretty much the way to go > but I need to complete related homework to make sure I did not > miss/forget anything. I understand. I've send this, because from v5 to v15 it moved towards matching in the rule, but it all started with the fact that nft_flow_offload_eval() uses nft_thoff(). At a bare minimum I need to address having pkt->thoff set correctly to implement the software bridge-fastpath. The fact that it also makes possible to match L3/L4 data in the rule is also nice to have. Hopefully you can take this in consideration during your review.