netdev - Re: [PATCH net] net: ipv6: support reporting otherwise unknown prefix flags in RTM

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Message-ID: <416f1e84-1293-470f-b613-d676fe9e4f93@kernel.org>
Date: Tue, 5 Dec 2023 20:39:28 -0700
From: David Ahern <dsahern@...nel.org>
To: Maciej Żenczykowski <maze@...gle.com>,
 Maciej Żenczykowski <zenczykowski@...il.com>
Cc: Linux Network Development Mailing List <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>, Shirley Ma <mashirle@...ibm.com>,
 Lorenzo Colitti <lorenzo@...gle.com>
Subject: Re: [PATCH net] net: ipv6: support reporting otherwise unknown prefix
 flags in RTM_NEWPREFIX

On 12/4/23 12:52 PM, Maciej Żenczykowski wrote:
> Lorenzo points out that we effectively clear all unknown
> flags from PIO when copying them to userspace in the netlink
> RTM_NEWPREFIX notification.

The existing flags have been there since before git (2005) and no new
ones have been added. So, what is the problem with existing code?
conflicts with an out-of-tree patch?