netdev - Re: [PATCH net-next] ipv4/fib: send RTM

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZL+F6zUIXfyhevmm@Laptop-X1>
Date: Tue, 25 Jul 2023 16:20:59 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: Stephen Hemminger <stephen@...workplumber.org>
Cc: Ido Schimmel <idosch@...sch.org>, David Ahern <dsahern@...nel.org>,
	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: [PATCH net-next] ipv4/fib: send RTM_DELROUTE notify when flush
 fib

On Mon, Jul 24, 2023 at 08:48:20AM -0700, Stephen Hemminger wrote:
> On Mon, 24 Jul 2023 16:56:37 +0800
> Hangbin Liu <liuhangbin@...il.com> wrote:
> 
> > The NetworkManager keeps a cache of the routes. Missing/Wrong events mean that
> > the cache becomes inconsistent. The IPv4 will not send src route delete info
> > if it's bond to other device. While IPv6 only modify the src route instead of
> > delete it, and also no notify. So NetworkManager developers complained and
> > hope to have a consistent and clear notification about route modify/delete.
> 
> Read FRR they get it right. The routing daemons have to track kernel,
> and the semantics have been worked out for years.

Yes, normally the routing daemon need to track kernel. On the other hand,
the kernel also need to make a clear feedback. The userspace developers may
not know the kernel code very well. The unclear/inconsistent notification
would make them confused.

Thanks
Hangbin