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Date: Wed, 06 May 2020 17:22:05 -0700 (PDT) From: David Miller <davem@...emloft.net> To: ahabdels@...il.com Cc: kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org, kuba@...nel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, dav.lebrun@...il.com Subject: Re: [net] seg6: fix SRH processing to comply with RFC8754 From: Ahmed Abdelsalam <ahabdels@...il.com> Date: Mon, 4 May 2020 14:42:11 +0000 > The Segment Routing Header (SRH) which defines the SRv6 dataplane is defined > in RFC8754. > > RFC8754 (section 4.1) defines the SR source node behavior which encapsulates > packets into an outer IPv6 header and SRH. The SR source node encodes the > full list of Segments that defines the packet path in the SRH. Then, the > first segment from list of Segments is copied into the Destination address > of the outer IPv6 header and the packet is sent to the first hop in its path > towards the destination. > > If the Segment list has only one segment, the SR source node can omit the SRH > as he only segment is added in the destination address. > > RFC8754 (section 4.1.1) defines the Reduced SRH, when a source does not > require the entire SID list to be preserved in the SRH. A reduced SRH does > not contain the first segment of the related SR Policy (the first segment is > the one already in the DA of the IPv6 header), and the Last Entry field is > set to n-2, where n is the number of elements in the SR Policy. > > RFC8754 (section 4.3.1.1) defines the SRH processing and the logic to > validate the SRH (S09, S10, S11) which works for both reduced and > non-reduced behaviors. > > This patch updates seg6_validate_srh() to validate the SRH as per RFC8754. > > Signed-off-by: Ahmed Abdelsalam <ahabdels@...il.com> Applied, thanks.
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