netdev - Re: [PATCH 1/2] ipv6: Store ndisc

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Message-Id: <20100523.235858.262775026.davem@davemloft.net>
Date:	Sun, 23 May 2010 23:58:58 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	bmb@...enacr.com
Cc:	tgraf@...hat.com, nhorman@...driver.com, nhorman@...hat.com,
	eric.dumazet@...il.com, herbert@...dor.hengli.com.au,
	netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] ipv6: Store ndisc_nodeid in IP6CB().

From: David Miller <davem@...emloft.net>
Date: Wed, 19 May 2010 19:55:36 -0700 (PDT)

> 
> There is no reason we need to use up space in the generic
> SKB area for this.  All packet input paths in ipv6 explicitly
> clear out the IP6CB() area and therefore the default value
> for ndisc_nodeid will be correct.
> 
> Signed-off-by: David S. Miller <davem@...emloft.net>

Turns out the patch doesn't build, because it throws the
DCCP control block beyond the skb->cb[] size of 48 bytes
with ipv6 enabled on 64-bit.

Ho hum...
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