netdev - Re: UDP path MTU discovery

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Message-Id: <20100325.202636.149498207.davem@davemloft.net>
Date:	Thu, 25 Mar 2010 20:26:36 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	rick.jones2@...com
Cc:	gdt@....id.au, netdev@...r.kernel.org
Subject: Re: UDP path MTU discovery

From: Rick Jones <rick.jones2@...com>
Date: Thu, 25 Mar 2010 17:53:11 -0700

> So, presuming it is indeed a bug what form might a fix take? Are you
> suggesting there should be a way for an application to say "Please let
> me see/know about the ICMP messages?"  Is that option available on
> other platforms as a platform-specific extension?

We already provide this information.

The socket ends up with EMSGSIZE in it's error queue, so the next time
the application does I/O it sees that error immediately from the
read/write call and thus knows that path MTU arrived.
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