netdev - Re: [PATCH] firewire net: Ensure checksumming in upper layer.

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Message-ID: <50FC08E5.6020903@linux-ipv6.org>
Date:	Mon, 21 Jan 2013 00:10:29 +0900
From:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
To:	stephan.gatzka@...il.com
CC:	Stefan Richter <stefanr@...6.in-berlin.de>,
	linux1394-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH] firewire net: Ensure checksumming in upper layer.

Stephan Gatzka wrote:
> 
>>> Indeed neither the device nor the lower drivers check protocol checksums.
>>> But the CRCs of the encapsulating 1394 packets are checked in hardware.
>>> Shall protocol checksums be verified regardless?
>>
>> Yes, because packets may come from off-link source.
>>
> 
> Hm, I can't see any off-link packets coming from fwnet_finish_incoming_packet()
> 
> So I wont verify checksums in the driver.

"Off-link source" means the source exists on the different L2
network.  In other words, source is connected via router(s).

         ethernet             firewire
 Host -------------- Router ------------ Host

--yoshfuji
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