netdev - Re: [PATCH 2/2] iproute: Add route showdump command (v2)

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Message-ID: <20120727100557.6c60ac58@nehalam.linuxnetplumber.net>
Date:	Fri, 27 Jul 2012 10:05:57 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] iproute: Add route showdump command (v2)

On Fri, 27 Jul 2012 10:06:15 +0400
Pavel Emelyanov <xemul@...allels.com> wrote:

> I mean something like the below, just put the RTM_GETADDR stream into a
> file and push it back into the kernel as is. It worked for me in trivial
> cases, but is this approach correct generically?

It is supposed to always work to reverse netlink messages back to the kernel.
There a couple of caveats:
 1. Some fields like statistics are just ignored by the kernel and can never
    be reset.
 2. The feature isn't commonly used and it is always possible that it will
    expose a kernel bug.
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