linux-kernel - Re: [PATCH 4.9 27/75] net: igmp: Use correct source address on IGMPv3 reports

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Message-ID: <d98ce7ce-2a51-ddf3-c6b7-7b7343fbbd9f@dd-wrt.com>
Date:   Tue, 16 Jan 2018 16:40:24 +0100
From:   Sebastian Gottschall <s.gottschall@...wrt.com>
To:     Kevin Cernekee <cernekee@...omium.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable <stable@...r.kernel.org>,
        Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 4.9 27/75] net: igmp: Use correct source address on IGMPv3
 reports

>> easy answer from wikipedia. 224.0.x.x is not the only multicast block
> AFAICT the code that was changed by this patch should not have
> anything to do with other multicast blocks.  It generates an IGMPv3
> report with destination address 224.0.0.22.  So it would be useful to
> get more information on how exactly it is causing a failure, so we can
> find the root cause.
from your code it always returns 0.0.0.0 and not the correct origin if 
your rule doesnt match. this is a different behaviour. before, the 
origin was used as is and not modified.
if the origin is set to zero, the routing of the network doesnt work 
anymore. this works for local multicast addresses, but not for neighbor 
networks which are using the routing table
but correct me if i'm wrong


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