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Thu, 19 Feb 2026 06:06:51 -0800 (PST) X-Received: by 2002:a05:600c:548e:b0:480:6dff:e786 with SMTP id 5b1f17b1804b1-48379bff816mr296563195e9.37.1771510010565; Thu, 19 Feb 2026 06:06:50 -0800 (PST) Received: from debian ([2001:4649:fcb8:0:7ef1:6110:bb21:b83a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-483a31b1d79sm16276135e9.3.2026.02.19.06.06.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Feb 2026 06:06:49 -0800 (PST) Date: Thu, 19 Feb 2026 15:06:46 +0100 From: Guillaume Nault To: Qingfang Deng Cc: linux-ppp@vger.kernel.org, Michal Ostrowski , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Michal Ostrowski , Dianne Skoll , Paul Mackerras , Jaco Kroon , James Carlson , Arnd Bergmann Subject: Re: [PATCH RFC net-next v2] pppoe: remove kernel-mode relay support Message-ID: References: <20260213091605.132561-1-dqfext@gmail.com> Precedence: bulk X-Mailing-List: linux-ppp@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260213091605.132561-1-dqfext@gmail.com> On Fri, Feb 13, 2026 at 05:16:04PM +0800, Qingfang Deng wrote: > The kernel-mode PPPoE relay feature and its two associated ioctls > (PPPOEIOCSFWD and PPPOEIOCDFWD) are not used by any existing userspace > PPPoE implementations. The most commonly-used package, RP-PPPoE [1], > handles the relaying entirely in userspace. > > This legacy code has remained in the driver since its introduction in > kernel 2.3.99-pre7 for over two decades, but has served no practical > purpose. Also, this code was broken since its inception up to 2016, as it did leak a socket reference in the normal data path (see commit 29e73269aa4d ("pppoe: fix reference counting in PPPoE proxy")). The bug was caught by code inspection, which strongly suggests that nobody tried to use it before that. > Remove the unused relay code. Reviewed-by: Guillaume Nault