netdev - Re: [PATCH 1/2] net: Allow to create links with given ifindex

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Date:	Sat, 04 Aug 2012 09:10:40 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	ebiederm@...ssion.com, xemul@...allels.com, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] net: Allow to create links with given ifindex

On Fri, 2012-08-03 at 16:56 -0700, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Fri, 03 Aug 2012 07:45:29 +0200
> 
> > @@ -1587,13 +1587,11 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
> >  	if (ipv4_is_zeronet(daddr))
> >  		goto martian_destination;
> >  
> > -	if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) {
> > -		if (ipv4_is_loopback(daddr))
> > -			goto martian_destination;
> > +	if (ipv4_is_loopback(daddr) && !IN_DEV_NET_ROUTE_LOCALNET(in_dev, net))
> > +		goto martian_destination;
> >  
> > -		if (ipv4_is_loopback(saddr))
> > -			goto martian_source;
> > -	}
> > +	if (ipv4_is_loopback(saddr) && !IN_DEV_NET_ROUTE_LOCALNET(in_dev, net))
> > +		goto martian_source;
> 
> Maybe clearer as:
> 
> 	if ((ipv4_is_loopback(daddr) || ipv4_is_loopback(saddr)) &&
> 	    !IN_DEV_NET_ROUTE_LOCALNET(in_dev, net))
> 		goto martian_source;

Clearer, but handling of a martian destination is different of the
martian source ;)



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