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([2a01:e0a:b41:c160:5568:c43d:79bc:c2ec]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-454a997e24bsm2310945e9.16.2025.07.02.09.17.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 02 Jul 2025 09:17:45 -0700 (PDT) Message-ID: <6a42127f-77bd-4a25-af61-8bb8adb666c1@6wind.com> Date: Wed, 2 Jul 2025 18:17:44 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Reply-To: nicolas.dichtel@6wind.com Subject: Re: [PATCH v3] ipv6: add `force_forwarding` sysctl to enable per-interface forwarding To: Jakub Kicinski Cc: Gabriel Goller , "David S. Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , Jonathan Corbet , David Ahern , netdev@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250702074619.139031-1-g.goller@proxmox.com> <20250702073458.3294b431@kernel.org> <7c47cfb6-c1f1-42a1-8137-37f8f03fa970@6wind.com> <20250702091055.3d70a5ee@kernel.org> From: Nicolas Dichtel Content-Language: en-US Organization: 6WIND In-Reply-To: <20250702091055.3d70a5ee@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Le 02/07/2025 à 18:10, Jakub Kicinski a écrit : > On Wed, 2 Jul 2025 17:14:42 +0200 Nicolas Dichtel wrote: >>> Should we invert the polarity? It appears that the condition below only >>> let's this setting _disable_ forwarding. IMO calling it "force" suggests >>> to the user that it will force it to be enabled. >> Not sure to follow you. When force_forwarding is set to 1 the forwarding is >> always enabled. >> >> sysctl | all.forwarding | iface.force_forwarding | packet processing from iface >> | 0 | 0 | no forward >> | 0 | 1 | forward >> | 1 | 0 | forward >> | 1 | 1 | forward > > Ugh, I can't read comparisons to zero. > Let's switch to more sane logic: > > if (idev && !READ_ONCE(idev->cnf.force_forwarding) && > !READ_ONCE(net->ipv6.devconf_all->forwarding)) +1