netdev - Re: [PATCH] net: Fix IPv6 PMTU disc. w/ asymmetric routes

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Date:	Sun, 3 Oct 2010 17:21:46 -0700
From:	Maciej Żenczykowski <zenczykowski@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH] net: Fix IPv6 PMTU disc. w/ asymmetric routes

> Ok, meanwhile I did the research.
>
> What ipv6 does is that when you lookup a route, it clones or copies
> the prefixes route into one that is fully specified for a specific
> SADDR/DADDR pair, and then inserts that specific route into the FIB6
> tree.
>
> Therefore the only cases we should lookup for PMTU discovery for ipv6
> are:
>
>        { daddr, saddr, ifindex == 0 }
>        { daddr, saddr, ifindex == dev->ifindex }
>
> This achieves the same effect as what ipv4 is doing.
>
> So Maciej your original attempt was correct all along, and as a result
> I'll commit the following.
>
> Thanks!

Awesome.  I've been trying to convince myself of this and come up with
a concise explanation - but it sounds like you got there first.

[I ran into SUBTREES and got stuck in trying to understand exactly how
they work and whether they affect this at all.]
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