netdev - Re: /proc/net/igmp group address encoding

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Date:	Thu, 25 Sep 2008 00:35:40 -0700
From:	David Stevens <dlstevens@...ibm.com>
To:	"Rami Rosen" <roszenrami@...il.com>
Cc:	netdev@...r.kernel.org, netdev-owner@...r.kernel.org,
	"Pekka Savola" <pekkas@...core.fi>
Subject: Re: /proc/net/igmp group address encoding

netdev-owner@...r.kernel.org wrote on 09/24/2008 11:44:45 PM:

> Hi,
> 
> - I had noticed a long ago that the IP addresses under
>  /proc/net/igmp are in Hexa format. I am preparing a patch to fix it
> and it will be send very soon.

I don't think we can do that, since I believe netstat expects
to see this the way it is. Maybe if we change netstat to support
both and wait a year for all distros to get it... :-)


> So indeed , the count (mc_count of netdevice) shows both IPv4 and IPv6 
igmp
> groups, but in current implementation it is not immediate
> to change it. Currently, net_device struct does not have specific
> fields for ipv4 or ipv6.  One way of preparing a patch
> is to change net_device to have mc_count4 and mc_count6;
> I am really willing to prepare such a patch, but I am not sure such a
> change in net_device is a proper and a justified
> change to do.

        These belong with mc_list in inet6_dev and in_device. Really,
I'd just add "mc_count" as a field right next to mc_list and inc/dec
it when calling the group join/leave functions-- use the list lock
to protect it. The structure it's in distinguishes the protocol,
and the names are otherwise common.

                                                                +-DLS

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