netdev - Re: [RFC] Stable interface index option

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Message-ID: <20151202014118.GD29814@lunn.ch>
Date:	Wed, 2 Dec 2015 02:41:18 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	Maximilian Wilhelm <max@...2324.org>, netdev@...r.kernel.org
Subject: Re: [RFC] Stable interface index option

> In general the ifindexes are designed to not be reused very fast.

Some parts of multicast group management rely on this. You need to
remove group memberships from a socket when an interface has
disappeared, e.g. a VPN interface has gone away. You can pass the
ifindex of the no longer existing interface when removing the group
memberships. If that ifindex has been re-used, you are going to have
interesting race conditions.

	    Andrew
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