netdev - Re: [PATCHv3 net] ipv6: do not match device when remove source route

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Message-ID: <8c8ba9bd-875f-fe2c-caf1-6621f1ecbb92@kernel.org>
Date: Sun, 23 Jul 2023 12:12:00 -0600
From: David Ahern <dsahern@...nel.org>
To: Ido Schimmel <idosch@...sch.org>, Hangbin Liu <liuhangbin@...il.com>
Cc: netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Thomas Haller <thaller@...hat.com>
Subject: Re: [PATCHv3 net] ipv6: do not match device when remove source route

On 7/23/23 2:13 AM, Ido Schimmel wrote:
> 
> I don't know, but when I checked the code and tested it I noticed that
> the kernel doesn't care on which interface the address is configured.
> Therefore, in order for deletion to be consistent with addition and with
> IPv4, the preferred source address shouldn't be removed from routes in
> the VRF table as long as the address is configured on one of the
> interfaces in the VRF.
> 

Deleting routes associated with device 2 when an address is deleted from
device 1 is going to introduce as many problems as it solves. The VRF
use case is one example.