From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f42.google.com (mail-pj1-f42.google.com [209.85.216.42]) (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 59D442EC083 for ; Wed, 1 Apr 2026 15:07:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.42 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775056045; cv=none; b=KVCmbu/KyYy2Ext5/5gojTnZwMJQOIwdzQLTBHzNf4Pb3HKd5XHghLBlDxYv6b5d+3nehWkbyHg9odRGXtynfGVCobHK74V/QdR2bUtAZ64VyTGSYcK/+yonBIiJL+qMzWIf55CnK7rWc2P162djz+ydbkR4FVSloThyInZKUxs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775056045; c=relaxed/simple; bh=bjcwsYJwkpqzg1+Jd+PAkNPiIUaqng2IgQHyEKuA3jU=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ku1R44tnczdC1ChV19bo40RoDgD1poVjw7WuLP3e3JgHdfDo0MTYRhXD9ij4zDRihBwVlHZx2mU6n7bXCZz9LAkNY1N44JJ9ctK8qmIXUeWuxG/zKmo5F93YfzDjTQcatVo1jx3SczQHO83M0fW9Mcv5j2DBwEI97gAr8Y/HRG8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=networkplumber.org; spf=pass smtp.mailfrom=networkplumber.org; dkim=pass (2048-bit key) header.d=networkplumber-org.20230601.gappssmtp.com header.i=@networkplumber-org.20230601.gappssmtp.com header.b=pvvONBMP; arc=none smtp.client-ip=209.85.216.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=networkplumber.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=networkplumber.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=networkplumber-org.20230601.gappssmtp.com header.i=@networkplumber-org.20230601.gappssmtp.com header.b="pvvONBMP" Received: by mail-pj1-f42.google.com with SMTP id 98e67ed59e1d1-35c2fe0d90fso3386669a91.1 for ; Wed, 01 Apr 2026 08:07:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20230601.gappssmtp.com; s=20230601; t=1775056044; x=1775660844; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=QJuOxpA+gsO22gNPhXzJ2+Gj7ezb5L7fZMCH+oDlAG8=; b=pvvONBMP+FusaaII65++8DgYTon6o6wvICY7wRMlqojsy0Pz2YGtw88a5ZndpiPNbJ qApVXIfMuAlgCD44nPizCmr4iR7FiifOEdooE9ZdElP6qgbJM47ryxVSvZhkakeX4uUm D1QciWzNs6UF/wBlFOs2hpmQ6TyFFVEfnYAZc1eTT2BMauvPiNqrRKECaKK/e0zQaUJx 8SG+BVXpG7aqQlKQLetcu2ylQX5TP1dNbyu1FbFsI5RpadI9uHwBzLOBwza76U9AXPAa UrL6hK7TB90Vg7hL16+6LmbBqOYsCfyq/QmR7a/EUCLAwasUUpGWxYhb1ZHhrKqpHvoT pqIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775056044; x=1775660844; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=QJuOxpA+gsO22gNPhXzJ2+Gj7ezb5L7fZMCH+oDlAG8=; b=n7RQDZ3l58lXiYUSGc9JOsYTdcQFEFMP1DZ/mxg6LI3JWMbRMDUzGvPBmXezWQIQUI yvsW5zFeOPD07Odkpr4rqA/BRLAipMbVpaN+1XqRRYFeXtBP/gGeDvZcGy7CkGjFJcU8 csWRWTsjJyfpzGoNw2z6QLnIHp9BPoIiqvI/iCZCY8OeAF7TS7ZNucPICueFySnKcmCL oFFuUpcXuS0Udkg3vZgKPP0TckPJFoU1qmZZWAPbLkmV830EyX3ORG9EGhKzJxnR7D07 1hn0tPPq8thjXBEJ4MInp36Hf8Ixc2FPgR/n64UCCov8+IikgGISWpVlXqJRkYrve0Un GPuw== X-Forwarded-Encrypted: i=1; AJvYcCVDw8CpGav/5/olj/U+4tpU6WTu4N5vIzEaIBvg1SLlSMdXInPnY+wFUiTCLf3vs3QLr0CVrzY=@vger.kernel.org X-Gm-Message-State: AOJu0YwfiRgCRM30e4b4kdzM1sZ0FYb6qflsWMAvUZLb0zaJ3oh3ipd9 S9MUI8wEETe9IZu3Jd4DmiNuaXLaaYv5/VipkVswOKfdydOKL7clHTA3LA5W15nNRVQ= X-Gm-Gg: ATEYQzwsWK8pIyPhP00ERBWKh4kGedS7xRVAb1btitNmJVLaYtRJTUdR+wADs5uAiNi GTqtcK+CmqQeXNLxqFeyuwwchQGr6yikafQyQsuJJX7DdI7nu/VKNwmPJ2uw+efiIyXvFDW+O0I E8x9wdldAOJW0zhVnjsZUi/VnFoHZjSzK/uZ9+20q04gF1qHwz4YZaO4VNkGbCBYGR3w+oVu7Yd JmwPJrVYG8x8/VulN+EpOfdnCyrhgDwvbrC3trQNNyHZ4NHYF8Zl+f8uEjoRGnve4EYLXYGhRSi cFDFiz3DUZEDJZu03efyht3z8Q18bVIFMU/SA4HgLIbB0uIjpsoGIZeopJIRDzPvNe4ICRSanXe KG8tAsKIfStTxJ+8OmYARdBL1kWYeyVXco9eOcpLKrnq4ioALXPf0TGfq64FRzqLiidff2SMRH6 fiIO9XnOfb9f52YvodenkJ0thNJyVT4ZWJvFFZcB5agWATjw== X-Received: by 2002:a17:90b:3e4f:b0:359:fdc0:4621 with SMTP id 98e67ed59e1d1-35dc6e9b097mr4036315a91.11.1775056043722; Wed, 01 Apr 2026 08:07:23 -0700 (PDT) Received: from phoenix.local ([104.202.41.210]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-35dbe623754sm5043344a91.6.2026.04.01.08.07.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Apr 2026 08:07:23 -0700 (PDT) Date: Wed, 1 Apr 2026 08:06:57 -0700 From: Stephen Hemminger To: David Woodhouse Cc: Eric Dumazet , Saeed Mahameed , Leon Romanovsky , Tariq Toukan , Mark Bloch , Andrew Lunn , "David S. Miller" , Jakub Kicinski , Paolo Abeni , Simon Horman , Nikolay Aleksandrov , Ido Schimmel , Martin KaFai Lau , Daniel Borkmann , John Fastabend , Stanislav Fomichev , Alexei Starovoitov , Andrii Nakryiko , Eduard Zingerman , Song Liu , Yonghong Song , KP Singh , Hao Luo , Jiri Olsa , Kuniyuki Iwashima , Willem de Bruijn , David Ahern , Neal Cardwell , Johannes Berg , Pablo Neira Ayuso , Florian Westphal , Phil Sutter , Guillaume Nault , Kees Cook , Alexei Lazar , Gal Pressman , Paul Moore , netdev@vger.kernel.org, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, oss-drivers@corigine.com, bridge@lists.linux.dev, bpf@vger.kernel.org, linux-wireless@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, torvalds@linux-foundation.org Subject: Re: [PATCH 6/6] net: Warn when processes listen on AF_INET sockets Message-ID: <20260401080657.70cd9bd1@phoenix.local> In-Reply-To: <252823d75e9221647e7f8ccef6105432aabe8d6f.camel@infradead.org> References: <20260401074509.1897527-1-dwmw2@infradead.org> <20260401074509.1897527-7-dwmw2@infradead.org> <252823d75e9221647e7f8ccef6105432aabe8d6f.camel@infradead.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Wed, 01 Apr 2026 10:28:23 +0100 David Woodhouse wrote: > > Some kernels are built without CONFIG_IPV6, so this warning would be > > quite misleading. > > Maybe on this date next year, we could make it not possible to build > the kernel *without* IPv6... ? There are some government agencies that used to require that IPV6 was disabled for security reasons. Yes they had broken old firewalls