netdev - Re: multicasting netlink messages to groups

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Date:	Thu, 05 Jul 2007 16:08:12 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	hadi@...erus.ca
CC:	Johannes Berg <johannes@...solutions.net>,
	netdev <netdev@...r.kernel.org>, Thomas Graf <tgraf@...g.ch>
Subject: Re: multicasting netlink messages to groups > 31 from userspace

jamal wrote:
>
>>Looking through the code that uses NL_NONROOT_SEND I just realised that
>>it's impossible to send multicast messages from userspace to multicast
>>groups with IDs higher than 31. That's not really good given that
>>everywhere else we handle multicast groups up to 2^32-1 :/
> 
> 
> Yes, this is TheWayItHasBeen(tm).
> Patrick had a patch a while back to allow for subscribing to higher
> groups because bind() has a similar issue in that it allows you only to
> subscribe to the first 32. So it is logical to fix connect, and sendmsg
> in a similar fashion.


For sendmsg I'd suggest to use cmsgs as in recvmsg().

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