Re: [PATCH net-next] net: Enable support for VRF with ipv4 multicast

[David Miller <davem@davemloft.net>]

From: David Ahern <dsa@cumulusnetworks.com>
Date: Mon, 31 Oct 2016 15:54:00 -0700

> Enable support for IPv4 multicast:
> - similar to unicast the flow struct is updated to L3 master device
>   if relevant prior to calling fib_rules_lookup. The table id is saved
>   to the lookup arg so the rule action for ipmr can return the table
>   associated with the device.
> 
> - ip_mr_forward needs to check for master device mismatch as well
>   since the skb->dev is set to it
> 
> - allow multicast address on VRF device for Rx by checking for the
>   daddr in the VRF device as well as the original ingress device
> 
> - on Tx need to drop to __mkroute_output when FIB lookup fails for
>   multicast destination address.
> 
> - if CONFIG_IP_MROUTE_MULTIPLE_TABLES is enabled VRF driver creates
>   IPMR FIB rules on first device create similar to FIB rules. In
>   addition the VRF driver does not divert IPv4 multicast packets:
>   it breaks on Tx since the fib lookup fails on the mcast address.
> 
> With this patch, ipmr forwarding and local rx/tx work.
> 
> Signed-off-by: David Ahern <dsa@cumulusnetworks.com>

Applied, thanks David.