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Date:   Tue, 12 May 2020 08:17:54 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'David Miller' <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH net-next] net/ipv4/raw Optimise ipv4 raw sends when
 IP_HDRINCL set.

From: David Miller <davem@...emloft.net>
> Sent: 12 May 2020 00:10
> From: David Laight <David.Laight@...LAB.COM>
> Date: Mon, 11 May 2020 21:28:18 +0000
> 
> > In this case the "modified in userspace meanwhile" just breaks the
> > application - it isn't any kind of security issue.
> 
> The kernel must provide correct behavior based upon the stable IP
> header that it copies into userspace.  I'm not moving on this
> requirement, sorry.
> 
> I'm sure you have great reasons why you can't use normal UDP sockets
> for RTP traffic, but that's how you will get a cached route and avoid
> this exact problem.

Not unless you can tell me how to create a UDP socket that doesn't
receive data.
Even if there is a corresponding RTP receive flow there is no reason
why it should use the same port numbers and IP addresses.

	David

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