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From: Andrew Lunn <andrew@lunn.ch>
To: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Maximilian Wilhelm <max@rfc2324.org>, netdev@vger.kernel.org
Subject: Re: [RFC] Stable interface index option
Date: Wed, 2 Dec 2015 02:41:18 +0100	[thread overview]
Message-ID: <20151202014118.GD29814@lunn.ch> (raw)
In-Reply-To: <1449014338.3866712.455236865.50F81F7F@webmail.messagingengine.com>

> 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

  reply	other threads:[~2015-12-02  1:41 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-01 12:04 [RFC] Stable interface index option Maximilian Wilhelm
2015-12-01 15:34 ` Sowmini Varadhan
2015-12-01 15:50   ` Maximilian Wilhelm
2015-12-01 16:02     ` Hannes Frederic Sowa
2015-12-01 16:06       ` Stephen Hemminger
2015-12-01 19:28         ` David Miller
2015-12-01 20:20           ` Stephen Hemminger
2015-12-01 20:57             ` David Miller
2015-12-01 21:06               ` Sowmini Varadhan
2015-12-01 21:14               ` Hannes Frederic Sowa
2015-12-01 21:44                 ` Stephen Hemminger
2015-12-01 21:54                   ` Hannes Frederic Sowa
2015-12-01 22:31                     ` Stephen Hemminger
2015-12-01 19:27       ` David Miller
2015-12-01 20:26         ` Hannes Frederic Sowa
2015-12-01 22:43           ` Maximilian Wilhelm
2015-12-01 23:58             ` Hannes Frederic Sowa
2015-12-02  1:41               ` Andrew Lunn [this message]
2015-12-02 11:03               ` Marcelo Ricardo Leitner
2015-12-01 16:11     ` Sowmini Varadhan
2015-12-01 16:10 Maximilian Wilhelm

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