From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from www62.your-server.de (www62.your-server.de [213.133.104.62]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 047133563E1 for ; Tue, 21 Apr 2026 07:33:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.133.104.62 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776756802; cv=none; b=k/vwGRjfiFLs6ziooKuOMehfQ1LDKkRvpIQGlgTeHXflraIxSoMWJZRQ0RKwgzzN9H0qj5y9QcTj/3oJEJF1HXTYbTY0fwyRyIO33UO8NR++0QacTmVzRXSV1qkWl2ePJEn8Hpc4PNHUBhbjEOKiKOb+eA/arQj68e/JjpI6Cd4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776756802; c=relaxed/simple; bh=HdKN6vR/WF7gxYiO6PAmkmeiwKR29Ppe8uMUYLeZqFM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=UItgBw7Jk9GQiqgp/LQo/qQbdsfXgTNG2Q5pSO+c0CIJl3vidumaoh8T5gy3y1wPT2lpZjO0+foespwRfdv9bTalA3q8wOGdiCHl5xF/dX1mYEnaigvCWcQI+uNrEPCi61sOsB8cY+aDLOh2uj+m15WG6+dQSlTbwTS3e/JTjS8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=iogearbox.net; spf=pass smtp.mailfrom=iogearbox.net; dkim=pass (2048-bit key) header.d=iogearbox.net header.i=@iogearbox.net header.b=P/fIqS/b; arc=none smtp.client-ip=213.133.104.62 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=iogearbox.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iogearbox.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=iogearbox.net header.i=@iogearbox.net header.b="P/fIqS/b" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=iogearbox.net; s=default2302; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date:Message-ID:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID; bh=6nFLI4Wi6mv0Oz5B/rGpGVmJgVc3OUepi2LoX3t2SaY=; b=P/fIqS/b75rYhRDX+Mjwa0OXBK q/zuI7IZUaHkNNzKXOMFCihiE6sHkvhuy0RmLKAPGmCgK0LLO3grMofkhNLEKCCJvxclHTLV9axZL V055XNx2EpygnXHVY1r5g4lLoSS7nELI1exBkNCuSTuAAFDgx7W9lmn50pDikyL2AgRNEjlkb9epa HsB3kyjRNcebc5z8tsx8OGc+RSVhwQ/WxIOV/iN8j0/WZgFEM0nruEIf2zSRl45fUZrc8p2mt1lxq T4Ds+vku52xGXfAwi43qM0B/GqvlEBrpbunoPOp8Umn+QSrXKcU4kFsD7vZjMeD5d8d9fB0utMirC Bs4KzWgg==; Received: from sslproxy03.your-server.de ([88.198.220.132]) by www62.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96.2) (envelope-from ) id 1wF5bb-000CMM-2S; Tue, 21 Apr 2026 09:33:11 +0200 Received: from localhost ([127.0.0.1]) by sslproxy03.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1wF5ba-0007Df-2J; Tue, 21 Apr 2026 09:33:11 +0200 Message-ID: <94dab191-524b-4f8d-abde-e0ffc5848258@iogearbox.net> Date: Tue, 21 Apr 2026 09:33:08 +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 net v2] ipv6: Apply max_dst_opts_cnt to ip6_tnl_parse_tlv_enc_lim To: Justin Iurman , Ido Schimmel Cc: kuba@kernel.org, edumazet@google.com, dsahern@kernel.org, tom@herbertland.com, willemdebruijn.kernel@gmail.com, pabeni@redhat.com, netdev@vger.kernel.org References: <20260418121538.706095-1-daniel@iogearbox.net> <7c715640-5c20-4226-9c31-d2c5eef551db@gmail.com> <8fdf517b-6217-4df6-8adf-0c79ce8d3be8@gmail.com> <20260419143137.GA885197@shredder> <524def33-63e1-47c0-be38-dee68d859332@gmail.com> Content-Language: en-US From: Daniel Borkmann Autocrypt: addr=daniel@iogearbox.net; keydata= xsFNBGNAkI0BEADiPFmKwpD3+vG5nsOznvJgrxUPJhFE46hARXWYbCxLxpbf2nehmtgnYpAN 2HY+OJmdspBntWzGX8lnXF6eFUYLOoQpugoJHbehn9c0Dcictj8tc28MGMzxh4aK02H99KA8 VaRBIDhmR7NJxLWAg9PgneTFzl2lRnycv8vSzj35L+W6XT7wDKoV4KtMr3Szu3g68OBbp1TV HbJH8qe2rl2QKOkysTFRXgpu/haWGs1BPpzKH/ua59+lVQt3ZupePpmzBEkevJK3iwR95TYF 06Ltpw9ArW/g3KF0kFUQkGXYXe/icyzHrH1Yxqar/hsJhYImqoGRSKs1VLA5WkRI6KebfpJ+ RK7Jxrt02AxZkivjAdIifFvarPPu0ydxxDAmgCq5mYJ5I/+BY0DdCAaZezKQvKw+RUEvXmbL 94IfAwTFA1RAAuZw3Rz5SNVz7p4FzD54G4pWr3mUv7l6dV7W5DnnuohG1x6qCp+/3O619R26 1a7Zh2HlrcNZfUmUUcpaRPP7sPkBBLhJfqjUzc2oHRNpK/1mQ/+mD9CjVFNz9OAGD0xFzNUo yOFu/N8EQfYD9lwntxM0dl+QPjYsH81H6zw6ofq+jVKcEMI/JAgFMU0EnxrtQKH7WXxhO4hx 3DFM7Ui90hbExlFrXELyl/ahlll8gfrXY2cevtQsoJDvQLbv7QARAQABzSZEYW5pZWwgQm9y a21hbm4gPGRhbmllbEBpb2dlYXJib3gubmV0PsLBkQQTAQoAOxYhBCrUdtCTcZyapV2h+93z cY/jfzlXBQJjQJCNAhsDBQkHhM4ACAsJCAcNDAsKBRUKCQgLAh4BAheAAAoJEN3zcY/jfzlX dkUQAIFayRgjML1jnwKs7kvfbRxf11VI57EAG8a0IvxDlNKDcz74mH66HMyhMhPqCPBqphB5 ZUjN4N5I7iMYB/oWUeohbuudH4+v6ebzzmgx/EO+jWksP3gBPmBeeaPv7xOvN/pPDSe/0Ywp dHpl3Np2dS6uVOMnyIsvmUGyclqWpJgPoVaXrVGgyuer5RpE/a3HJWlCBvFUnk19pwDMMZ8t 0fk9O47HmGh9Ts3O8pGibfdREcPYeGGqRKRbaXvcRO1g5n5x8cmTm0sQYr2xhB01RJqWrgcj ve1TxcBG/eVMmBJefgCCkSs1suriihfjjLmJDCp9XI/FpXGiVoDS54TTQiKQinqtzP0jv+TH 1Ku+6x7EjLoLH24ISGyHRmtXJrR/1Ou22t0qhCbtcT1gKmDbTj5TcqbnNMGWhRRTxgOCYvG0 0P2U6+wNj3HFZ7DePRNQ08bM38t8MUpQw4Z2SkM+jdqrPC4f/5S8JzodCu4x80YHfcYSt+Jj ipu1Ve5/ftGlrSECvy80ZTKinwxj6lC3tei1bkI8RgWZClRnr06pirlvimJ4R0IghnvifGQb M1HwVbht8oyUEkOtUR0i0DMjk3M2NoZ0A3tTWAlAH8Y3y2H8yzRrKOsIuiyKye9pWZQbCDu4 ZDKELR2+8LUh+ja1RVLMvtFxfh07w9Ha46LmRhpCzsFNBGNAkI0BEADJh65bNBGNPLM7cFVS nYG8tqT+hIxtR4Z8HQEGseAbqNDjCpKA8wsxQIp0dpaLyvrx4TAb/vWIlLCxNu8Wv4W1JOST wI+PIUCbO/UFxRy3hTNlb3zzmeKpd0detH49bP/Ag6F7iHTwQQRwEOECKKaOH52tiJeNvvyJ pPKSKRhmUuFKMhyRVK57ryUDgowlG/SPgxK9/Jto1SHS1VfQYKhzMn4pWFu0ILEQ5x8a0RoX k9p9XkwmXRYcENhC1P3nW4q1xHHlCkiqvrjmWSbSVFYRHHkbeUbh6GYuCuhqLe6SEJtqJW2l EVhf5AOp7eguba23h82M8PC4cYFl5moLAaNcPHsdBaQZznZ6NndTtmUENPiQc2EHjHrrZI5l kRx9hvDcV3Xnk7ie0eAZDmDEbMLvI13AvjqoabONZxra5YcPqxV2Biv0OYp+OiqavBwmk48Z P63kTxLddd7qSWbAArBoOd0wxZGZ6mV8Ci/ob8tV4rLSR/UOUi+9QnkxnJor14OfYkJKxot5 hWdJ3MYXjmcHjImBWplOyRiB81JbVf567MQlanforHd1r0ITzMHYONmRghrQvzlaMQrs0V0H 5/sIufaiDh7rLeZSimeVyoFvwvQPx5sXhjViaHa+zHZExP9jhS/WWfFE881fNK9qqV8pi+li 2uov8g5yD6hh+EPH6wARAQABwsF8BBgBCgAmFiEEKtR20JNxnJqlXaH73fNxj+N/OVcFAmNA kI0CGwwFCQeEzgAACgkQ3fNxj+N/OVfFMhAA2zXBUzMLWgTm6iHKAPfz3xEmjtwCF2Qv/TT3 KqNUfU3/0VN2HjMABNZR+q3apm+jq76y0iWroTun8Lxo7g89/VDPLSCT0Nb7+VSuVR/nXfk8 R+OoXQgXFRimYMqtP+LmyYM5V0VsuSsJTSnLbJTyCJVu8lvk3T9B0BywVmSFddumv3/pLZGn 17EoKEWg4lraXjPXnV/zaaLdV5c3Olmnj8vh+14HnU5Cnw/dLS8/e8DHozkhcEftOf+puCIl Awo8txxtLq3H7KtA0c9kbSDpS+z/oT2S+WtRfucI+WN9XhvKmHkDV6+zNSH1FrZbP9FbLtoE T8qBdyk//d0GrGnOrPA3Yyka8epd/bXA0js9EuNknyNsHwaFrW4jpGAaIl62iYgb0jCtmoK/ rCsv2dqS6Hi8w0s23IGjz51cdhdHzkFwuc8/WxI1ewacNNtfGnorXMh6N0g7E/r21pPeMDFs rUD9YI1Je/WifL/HbIubHCCdK8/N7rblgUrZJMG3W+7vAvZsOh/6VTZeP4wCe7Gs/cJhE2gI DmGcR+7rQvbFQC4zQxEjo8fNaTwjpzLM9NIp4vG9SDIqAm20MXzLBAeVkofixCsosUWUODxP owLbpg7pFRJGL9YyEHpS7MGPb3jSLzucMAFXgoI8rVqoq6si2sxr2l0VsNH5o3NgoAgJNIg= In-Reply-To: <524def33-63e1-47c0-be38-dee68d859332@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Clear (ClamAV 1.4.3/27977/Mon Apr 20 08:26:26 2026) On 4/20/26 8:55 PM, Justin Iurman wrote: > On 4/19/26 16:31, Ido Schimmel wrote: >> On Sun, Apr 19, 2026 at 12:37:35AM +0200, Justin Iurman wrote: >>> Nope. But if it happens, users would be confused as max_dst_opts_cnt would >>> not have the same meaning in two different code paths. OTOH, I agree that >>> such situation would look suspicious. I guess it's fine to keep your patch >>> as is and to not over-complicate things unnecessarily. >> >> I agree that it's weird to reuse max_dst_opts_cnt here: >> >> 1. The meaning is different from the Rx path. >> >> 2. We only enforce max_dst_opts_cnt, but not max_dst_opts_len. >> >> 3. The default is derived from the initial netns, unlike in the Rx path. >> >> Given the above and that: >> >> 1. We believe that 8 options until the tunnel encapsulation limit option >> is liberal enough. >> >> 2. We don't want to over-complicate things. >> >> Can we go with an hard coded 8 and see if anyone complains? In the >> unlikely case that someone complains we can at least gain some insight >> into how this option is actually used with tunnels. > > In general, I'm not a big fan of hard-coded values, but I also think that in this context it would make sense to do so. This is not a strong +1, let's say it's more a "not against it". Makes sense, I'll update it in a v3.