netdev - Re: VRF: All router multicast entry(FF02:2) not added to VRF Dev but added on VLAN Dev

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Date:   Sat, 21 Mar 2020 15:16:34 -0600
From:   David Ahern <dsahern@...il.com>
To:     Sukumar Gopalakrishnan <sukumarg1973@...il.com>,
        netdev@...r.kernel.org
Subject: Re: VRF: All router multicast entry(FF02:2) not added to VRF Dev but
 added on VLAN Dev

On 3/20/20 2:33 AM, Sukumar Gopalakrishnan wrote:
> Hi David,
> 
> 
> Kernel Version : 4.14.170
> 
> 
> Initiating ping to All Router address(FF02::2) with DIP as FF02:2. (
> decoded packet attached).
> 
>  
> 
> when the packet reaches
> 
> vrf_ip6_rcv
> 
>   ipv6_ndisc_frame() returns FALSE since the ICMPV6 TYPE is 128 ( echo
> request)

But need_strict is true since it is a mcast address, so the device
change should not happen. As I recall this is one of those fundamental
use cases (ping to ff02::*) that has worked since day 1 for VRF.

> 
>   Changing ingress VLAN dev to VRF DEV on skb->dev.
> 
>      
>