netdev - Re: Re : Bug in using inet

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Message-ID: <20071114133118.GA28232@2ka.mipt.ru>
Date:	Wed, 14 Nov 2007 16:31:18 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Nj A <nj_a83@...oo.fr>
Cc:	netdev@...r.kernel.org
Subject: Re: Re : Bug in using inet_lookup ()

On Wed, Nov 14, 2007 at 01:12:11PM +0000, Nj A (nj_a83@...oo.fr) wrote:
> I suspected it could be that. However, can't see in ip_rcv the right portion that can help.
> Any further tip please?

It is ip_rcv_finish() called from ip_rcv():
	if (skb->dst == NULL) {
		int err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos,
					 skb->dev);
		if (unlikely(err)) {
			if (err == -EHOSTUNREACH)
				IP_INC_STATS_BH(IPSTATS_MIB_INADDRERRORS);
			else if (err == -ENETUNREACH)
				IP_INC_STATS_BH(IPSTATS_MIB_INNOROUTES);
			goto drop;
		}
	}

So you will have to specify device, you got your skb via.
Actually it is not exactly needed in some cases, you will need interface
index (dev->ifindex). You can find socket by using that number instead
of dereferencing dst.

-- 
	Evgeniy Polyakov
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