netdev - Re: [PATCH] ipv6: Fix the pmtu path for connected UDP socket

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Message-Id: <20160316.223803.240230703927987310.davem@davemloft.net>
Date:	Wed, 16 Mar 2016 22:38:03 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	weiwan@...gle.com, edumazet@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH] ipv6: Fix the pmtu path for connected UDP socket

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 16 Mar 2016 17:22:07 -0700

> One of the issue is that IPV6_MTU getsockopt() will not check the dst,
> but simply use __sk_dst_get() : It will then report old mtu.

That's a bug.

ipv4 does it right with a proper sk_dst_get() and so should
ipv6.