netdev - Re: pimreg zombies

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Message-Id: <20100912.121713.189706279.davem@davemloft.net>
Date:	Sun, 12 Sep 2010 12:17:13 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	alex@...riz.org.uk
Cc:	netdev@...r.kernel.org
Subject: Re: pimreg zombies

From: Alexander Clouter <alex@...riz.org.uk>
Date: Sat, 4 Sep 2010 22:12:34 +0100

> I am writing a multicast pim daemon and noticed that if I call 
> setsockopt(MRT_ADD_VIF), also occurs for IPv6 too, incorrectly on a 
> socket established with socket(AF_INET, SOCK_RAW, IPPROTO_PIM)[1] then 
> when the application quits I have zombie pimreg (and pimreg6) interfaces 
> that can only be disposed of with a reboot.

pimreg interfaces can only be instantiated and removed from userspace
by using the appropriate MRT_*.  So you can get rid of these
interfaces by using an appropriate MRT_DEL_VIF call on an IPPROTO_PIM
socket.

They are not automatically removed by the closing of that userland
socket.
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