netdev - Re: question about function igmp_stop

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Message-ID: <20161025121936.GI22417@lunn.ch>
Date:   Tue, 25 Oct 2016 14:19:36 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Dongpo Li <lidongpo@...ilicon.com>
Cc:     netdev <netdev@...r.kernel.org>
Subject: Re: question about function igmp_stop_timer() in net/ipv4/igmp.c

> Otherwise the host can't send IGMP leave message when it leaves the
> group because the im->reporter is 0.

Leave is optional for IGMP v2, so net sending it is fine. And only a
querier is going to take any notice of it.

What happens when you have a querier in your network and you are using
IGMPv3. That is the use case which matters.

     Andrew