netdev - Re: [PATCH RESEND] ip_gre: sendto/recvfrom NBMA address

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Date:	Tue, 23 Oct 2007 23:03:24 +0400
From:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
To:	Timo Ter?s <timo.teras@....fi>
Cc:	Patrick McHardy <kaber@...sh.net>, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH RESEND] ip_gre: sendto/recvfrom NBMA address

Hello!

> When GRE tunnel is in NBMA mode, this patch allows an application to use
> a PF_PACKET socket to:
> - send a packet to specific NBMA address with sendto()
> - use recvfrom() to receive packet and check which NBMA address it came from
> 
> This is required to implement properly NHRP over GRE tunnel.

Ack. This is good idea.

Frankly, I was sure ip_gre worked in this way all these years.
I do not remember any reasons why it was crippled.

The only dubious case is when next hop is set using routing tables.
But code in ipgre_tunnel_xmit() is ready to accept this situation,
it checks for zero destination address and fixes it when it is able to.

Alexey
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