netdev - Re: [PATCH net 1/6] ipv4: fix sending of redirects

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Message-Id: <20121008.164158.1437741527673072117.davem@davemloft.net>
Date:	Mon, 08 Oct 2012 16:41:58 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ja@....bg
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net 1/6] ipv4: fix sending of redirects

From: Julian Anastasov <ja@....bg>
Date: Mon, 8 Oct 2012 23:43:45 +0300 (EEST)

> On Mon, 8 Oct 2012, David Miller wrote:
> 
>> From: Julian Anastasov <ja@....bg>
>> Date: Sun,  7 Oct 2012 14:26:03 +0300
>> 
>> > @@ -322,7 +322,8 @@ int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
>> >  {
>> >  	int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev);
>> >  
>> > -	if (!r && !fib_num_tclassid_users(dev_net(dev))) {
>> > +	if (!r && !fib_num_tclassid_users(dev_net(dev)) &&
>> > +	    dev->ifindex != oif) {
>> >  		*itag = 0;
>> >  		return 0;
>> >  	}
>> 
>> Hmmm, won't this cause the slow path to be taken for locally
>> destined traffic?
> 
> 	In this case idev=eth0 and oif=lo. The only case
> where we can see same input and output device is for
> forwarding and loopback (but only output routes where
> there is no such validation).

Ok, now I understand.  This added condition is fine.

Thanks.
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