netdev - Re: vrf and multicast problem

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Date:   Fri, 11 Mar 2022 17:36:33 -0700
From:   David Ahern <dsahern@...il.com>
To:     Ben Greear <greearb@...delatech.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: vrf and multicast problem

On 3/10/22 6:41 PM, Ben Greear wrote:
>>> can you reproduce this using namespaces and veth pairs? if so, send me
>>> the script and I will take a look.
>>
>> I think debugging it will be easier than writing something for you to
>> reproduce it...

A test case needs to be added to
tools/testing/selftests/net/fcnal-test.sh; nettest.c provides the
networking APIs so it should be fairly trivial to add.

> 
> After some more investigation of this code, I am questioning the need
> for this logic:
> 
>     /* update flow if oif or iif point to device enslaved to l3mdev */
>     l3mdev_update_flow(net, flowi4_to_flowi(flp));

that is fundamentally how VRF works. I would love to add the original
vrf port index to flowi4 for consideration with bind to device within a
VRF. I suspect your proposed patch is doing something close.