On 9/22/16 4:10 PM, Mark Tomlinson wrote:
> On 09/23/2016 03:14 AM, David Ahern wrote:
>> l3mdev devices do not support IPv4 multicast so checking mcast against that 
>> device should not be working at all. For that reason I was fine with the 
>> change in the previous patch. ie., you want the real ingress device there 
>> not the vrf device.
>> What test are you running that says your previous patch broke something?
> Although we do not expect any multicast routing to work in an l3mdev, 
> (IGMP snooping or PIM), we still want to have multicast packets 
> delivered for protocols such as RIP. This was working before my previous 
> patch, but these multicast packets are now dropped. This current patch 
> fixes that again, hopefully still with the benefits of my first patch.

can you discern which check is making that happen?

It does not make sense to look at the in_device of a vrf device for mcast 
addresses. For IPv6 linklocal and mcast is specifically blocked. IPv4 should do 
the same. So, how is RIP getting the packet at all?

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