netdev - Re: multicast routing and multiple interfaces with same IP

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Date:	Sat, 29 Aug 2009 00:01:54 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	opurdila@...acom.com
Cc:	mail4ilia@...il.com, netdev@...r.kernel.org
Subject: Re: multicast routing and multiple interfaces with same IP

From: Octavian Purdila <opurdila@...acom.com>
Date: Thu, 27 Aug 2009 02:53:18 +0300

> I don't have context on multicast routing, but this caught my attention:
> 
>>@@ -61,11 +61,13 @@ 
>> 	unsigned int vifc_rate_limit;	/* Rate limiter values (NI) */
>> 	struct in_addr vifc_lcl_addr;	/* Our address */
>> 	struct in_addr vifc_rmt_addr;	/* IPIP tunnel addr */
>>+	int ifindex;			/* Local interface index */
>> };
>>
> 
> Wouldn't this break userspace ABI? 
> 
> Perhaps you could use a union between vifc_lcl_addr and vifc_ifindex, they seem 
> to be exclusive.

Indeed, this will need to be fixed up.
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