netdev - Re: [PATCH net-next 05/18] ipv6: Set nexthop flags upon carrier change

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Date:   Sun, 7 Jan 2018 09:56:43 -0700
From:   David Ahern <dsahern@...il.com>
To:     Ido Schimmel <idosch@...lanox.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, roopa@...ulusnetworks.com,
        nicolas.dichtel@...nd.com, weiwan@...gle.com, kafai@...com,
        yoshfuji@...ux-ipv6.org, mlxsw@...lanox.com
Subject: Re: [PATCH net-next 05/18] ipv6: Set nexthop flags upon carrier
 change

On 1/7/18 3:45 AM, Ido Schimmel wrote:
> Similar to IPv4, when the carrier of a netdev changes we should toggle
> the 'linkdown' flag on all the nexthops using it as their nexthop
> device.
> 
> This will later allow us to test for the presence of this flag during
> route lookup and dump.
> 
> Up until commit 4832c30d5458 ("net: ipv6: put host and anycast routes on
> device with address") host and anycast routes used the loopback netdev
> as their nexthop device and thus were not marked with the 'linkdown'
> flag. The patch preserves this behavior and allows one to ping the local
> address even when the nexthop device does not have a carrier and the
> 'ignore_routes_with_linkdown' sysctl is set.
> 
> Signed-off-by: Ido Schimmel <idosch@...lanox.com>
> ---
>  include/net/ip6_route.h |  1 +
>  net/ipv6/addrconf.c     |  2 ++
>  net/ipv6/route.c        | 23 +++++++++++++++++------
>  3 files changed, 20 insertions(+), 6 deletions(-)

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