netdev - Re: [PATCH net] ipv4: mpls: fix mpls

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Date:   Sun, 25 Aug 2019 10:23:08 -0600
From:   David Ahern <dsahern@...il.com>
To:     Alexey Kodanev <alexey.kodanev@...cle.com>, netdev@...r.kernel.org
Cc:     David Miller <davem@...emloft.net>
Subject: Re: [PATCH net] ipv4: mpls: fix mpls_xmit for iptunnel

On 8/23/19 11:51 AM, Alexey Kodanev wrote:
> When using mpls over gre/gre6 setup, rt->rt_gw4 address is not set, the
> same for rt->rt_gw_family.  Therefore, when rt->rt_gw_family is checked
> in mpls_xmit(), neigh_xmit() call is skipped. As a result, such setup
> doesn't work anymore.
> 
> This issue was found with LTP mpls03 tests.
> 
> Fixes: 1550c171935d ("ipv4: Prepare rtable for IPv6 gateway")
> Signed-off-by: Alexey Kodanev <alexey.kodanev@...cle.com>
> ---
>  net/mpls/mpls_iptunnel.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

ok, I see now. This is a device only route with MPLS encap:

10.23.0.1  encap mpls  60 dev ltp_v0 scope link

and the change reverts to 5.1 behavior unless the gateway is IPv6 (new
behavior). Thanks for the patch.

Reviewed-by: David Ahern <dsahern@...il.com>