From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f67.google.com (mail-wm1-f67.google.com [209.85.128.67]) (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 240AF2264AB for ; Tue, 27 Jan 2026 18:01:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.67 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769536864; cv=none; b=jz3/5GZXVm0beW2HvZIQaI6jfb3PXcD/U9FGVVr+q6D1vV3kXgQLEL8Hfuc9BN8dFDuO52M3j2+Epk+Gbap/xMzK/F8uYJbBHb7CljjgxJ+VLjypXxtDM8X/Uy9LVrvcOaNt6pfVTzJnVHnAr4+4+IZW3Y5zaUbq0z17teatETs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769536864; c=relaxed/simple; bh=rYPaCm+c4Ka/zd87e5yKTsUdun6FPkSI2nLcgM/zwx0=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=eXZirtAQYKxEB0NPd60p5FbFkKo/ZgFzMMKwaWdD3lFUei7aIoPdiipISrs9yz5S8cNgm/ru65etW/BoGZeqPgQPsCihTNA3Pb1yEH+T72oFoxT+GU6gYykFVkOAkkawWvryaFu8ym7vmhGHa/oRrpzK4dMjEtDmkhXNgK7n3pM= 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=YUWKmjLN; arc=none smtp.client-ip=209.85.128.67 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="YUWKmjLN" Received: by mail-wm1-f67.google.com with SMTP id 5b1f17b1804b1-4801d98cf39so45661315e9.1 for ; Tue, 27 Jan 2026 10:01:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1769536860; x=1770141660; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:to:subject:user-agent:mime-version:date:message-id:from :to:cc:subject:date:message-id:reply-to; bh=FdIMuKrca0OMsXlKKw+mCgfZrpL7ruk2ZVGqQSIGBkg=; b=YUWKmjLNFv0gnEftxmoDnUTUU46TNOmAbiQ+WgFBELb9t0pFJmuYKjjBweOBg6zGjr Na8PAB8sh3mBxnALPp4qUfRDPhZ1cpCu8+oUMziSPd/Imll0CRDkO+AEgkuvUjnEt2ni oadi4d6gjE0wvp+GEDPV3WbxaM4YFg+NUYYceFxIBTouhtVjpi9HFu0cAmKGWBoc7Ly1 Dq7ziIZIdEKCPNLPYdCTtZ+O0RKsNlhbHI3HvfnZe9lhRFcxAGC+By5tB9afbrizVpET cDtTAVhy2SXkaibxNuKbouIXbDzMO8bbXAUGdSGR3zayV46Ahq6lmSV3h4tgV0oK2D7a lUDA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769536860; x=1770141660; h=content-transfer-encoding:in-reply-to:from:content-language :references:to:subject:user-agent:mime-version:date:message-id :x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=FdIMuKrca0OMsXlKKw+mCgfZrpL7ruk2ZVGqQSIGBkg=; b=LkEbOIzvR6YELCaF4C8yfElyplNqjIasbKvr911KuGWFMI2Rzh4j6ZvP5qfpzzX2QR Z0jcZP17TZzCXnSeR0gH234YqSBhEZ2uuJto12pLX6BEbH1QIus281oHmoPokaWW9/PX yCMt6uEf0cgxawanM9BsQjQXideeYJN1f/aosI9iDUqU2ikA+jnsNe+/h8O7eCFU67Wa 5GO31e4LX6rr3u8UyoW8Nsdg7tEp70gXIXLcCTwZturBZDFWEfBX/2YYlDvc2Q/hMFen IM9IXwGnoGuLTMLu2RF/cnTXtUs3P/Kb0CusZE08kzDswhBYJixX2qR7BTIy7V8WSfL8 IEbw== X-Forwarded-Encrypted: i=1; AJvYcCU/mikJG0idorqx/G+koApt3gdnEqVm4Djp9PLtWcvNF6RYnOEYK3LkbVsd+CTtkTGcZWhaxDU=@vger.kernel.org X-Gm-Message-State: AOJu0Yz/6ochrQYAecxyiZykI4dncgY4oJa0mjiZXOQ96c+hw2TBVVHk i9T2GCQhESDMY2bnWbXc1b15iaMmob1gOu9CP/Dg1LmosnelwKcze6vccmr6UFaXUhw= X-Gm-Gg: AZuq6aLhHFiLgWU/1YXplkGZ5idyuaKsAB6chAzWiASPko1IN2EqFsR+WLJ88L7cDMq I0j0YHorvX0VfQUR2hbxHcNsHd9IgHY3HwE64jjiYqcapBBHWJU3EYnCj5AUQs8bwGusDUUfFUd DGEQBjZpWXD6KRkyJb1mkj9ZKpvVGn74eHx+FXWjL30kXJ86uthDHVbl/n1m6ahkPNzUA1Yrb2N I4dFi1eE/VRJpSauny/cubN4M103B3yX3l44+zp3cR7vxzbgPmXy/pmpmemNXaRckH9Lryf7Xmo d0i3gkdK9LAniA5nkvScjs8FpBhfl/r1hDVs8tSjQS6/aOvfNLc8pxjhNXvzpGzommpvp88hH+I 1nboM34WIiIxGiuGCtX1BqWH3P92p1xvBgW3ROOWxs9p/V0Bt0J4oDucsi1295bdQMTMQypRhlX OIsKbS/zCU643qKcQgwVuRiqhgGXApWBOcqZepxbV2kkbLDQL3Y20XIZsyAu4E3eiVsw== X-Received: by 2002:a05:600c:450b:b0:480:426e:9d38 with SMTP id 5b1f17b1804b1-48069c96b8amr28115845e9.27.1769536859577; Tue, 27 Jan 2026 10:00:59 -0800 (PST) Received: from ?IPV6:2a02:a03f:a75e:9a00:7800:6d36:b552:d917? ([2a02:a03f:a75e:9a00:7800:6d36:b552:d917]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4806d99cf6asm386315e9.13.2026.01.27.10.00.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 27 Jan 2026 10:00:59 -0800 (PST) Message-ID: Date: Tue, 27 Jan 2026 19:00:58 +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 net-next v5 7/7] ipv6: Document enforce_ext_hdr_order sysctl To: Tom Herbert , davem@davemloft.net, kuba@kernel.org, netdev@vger.kernel.org References: <20260126194826.236075-1-tom@herbertland.com> <20260126194826.236075-8-tom@herbertland.com> Content-Language: en-US From: Justin Iurman In-Reply-To: <20260126194826.236075-8-tom@herbertland.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 1/26/26 20:48, Tom Herbert wrote: > Document the enforce_ext_hdr_order sysctl that controls whether > Extension Header order is enforced on receive. > > Signed-off-by: Tom Herbert > --- > Documentation/networking/ip-sysctl.rst | 28 ++++++++++++++++++++++++++ > 1 file changed, 28 insertions(+) > > diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst > index 4f568b0e39d2..1b12b955fa34 100644 > --- a/Documentation/networking/ip-sysctl.rst > +++ b/Documentation/networking/ip-sysctl.rst > @@ -2581,6 +2581,34 @@ ioam6_id_wide - LONG INTEGER > > Default: 0xFFFFFFFFFFFFFF > > +enforce_ext_hdr_order - BOOLEAN > + Enforce recommended Extension Header ordering in RFC8200. > + If the sysctl is set to 1 then the ordering the ordering is Reported by AI: s/the ordering the ordering/the ordering > + enforced in received packets and each Extension Header > + may be present at most once per packet. If the sysctl is > + set to 0 then ordering is not enforced and Extension Headers > + may be present in any order and have any number of > + occurences per packet (except for Hop-by-Hop Options). Reported by AI: s/occurences/occurrences > + > + The Extension Header order is: > + > + IPv6 header > + Hop-by-Hop Options header > + Destination Options before the Routing header > + Routing header > + Fragment header > + Authentication header > + Encapsulating Security Payload header > + Destination Options header > + Upper-Layer header > + > + Possible values: > + > + - 0 (disabled) > + - 1 (enabled) > + > + Default: 1 (enabled) > + > IPv6 Fragmentation: > > ip6frag_high_thresh - INTEGER Reviewed-by: Justin Iurman