netdev - Re: [RFC] net: ipv4: drop unicast encapsulated in L2 multicast

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Date:	Fri, 22 Aug 2014 10:54:05 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ja@....bg
Cc:	johannes@...solutions.net, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org, johannes.berg@...el.com
Subject: Re: [RFC] net: ipv4: drop unicast encapsulated in L2 multicast

From: Julian Anastasov <ja@....bg>
Date: Thu, 21 Aug 2014 22:51:02 +0300 (EEST)

>>  	if (res.type == RTN_BROADCAST)
>>  		goto brd_input;
> 
> 	Is this place better, after checking for RTN_BROADCAST?
> 
> 	/* ARP link-layer broadcasts are acceptable here */
> 	if ((skb->pkt_type == PACKET_BROADCAST ||
> 	     skb->pkt_type == PACKET_MULTICAST) &&
> 	    skb->protocol == htons(ETH_P_IP))
> 		goto e_inval;

Indeed, this would make ARP happier, but that still leaves open the
issue of CLUSTERIP.
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