netdev - Re: [PATCH net-next 0/3] l3mdev: Improve use with main table

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Date:   Wed, 12 Apr 2017 10:51:09 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Robert Shearman <rshearma@...cade.com>, davem@...emloft.net
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next 0/3] l3mdev: Improve use with main table

On 4/10/17 8:21 AM, Robert Shearman wrote:
> Attempting to create a TCP socket not bound to a VRF device when a TCP
> socket bound to a VRF device with the same port exists (and vice
> versa) fails with EADDRINUSE. This limits the ability to use programs
> in selected mixed VRF/non-VRF contexts.
> 
> This patch series solves the problem by extending the l3mdev be aware
> of the special semantics of the main table and fixing issues arising
> from the split local/main tables. A VRF master device created linking
> to the main table and used for these programs in the same way as those
> created for VRF tables can.
> 
> Robert Shearman (3):
>   ipv6: Fix route handling when using l3mdev set to main table
>   ipv4: Fix route handling when using l3mdev set to main table
>   l3mdev: Fix lookup in local table when using main table
> 
>  net/ipv4/af_inet.c      |  4 +++-
>  net/ipv4/fib_frontend.c | 14 +++++++++-----
>  net/ipv4/raw.c          |  5 ++++-
>  net/ipv6/addrconf.c     | 12 +++++++++---
>  net/ipv6/route.c        | 23 ++++++++++++++++++-----
>  net/l3mdev/l3mdev.c     | 26 ++++++++++++++++++++------
>  6 files changed, 63 insertions(+), 21 deletions(-)
> 

the patches look ok to me, but in testing them I see I refcnt problem.
simple reproducer:

ip li add red type vrf table 254
ip link set dev eth1 vrf red
ip addr add 127.0.0.1/8 dev red
ip link set dev eth1 up
ip li set red up
ping -c1 -w1 -I red 127.0.0.1
ip li del red
--> hangs with 'uregister_netdevice: waiting for red to become free.'