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

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Message-ID: <9edf97da-5492-b598-492e-c982591dddff@dd-wrt.com>
Date:   Tue, 16 Jan 2018 05:26:27 +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

Am 16.01.2018 um 04:58 schrieb Kevin Cernekee:
> On Mon, Jan 15, 2018 at 7:50 PM, Sebastian Gottschall
> <s.gottschall@...wrt.com> wrote:
>> please revert that on 4.9 and 4.14
>> it breaks igmp routing. it can be reproduced with any iptv connection using
>> igmp-proxy. reverting this patch fixes the issue.
> Hi Sebastian,
>
> Is this the correct igmp-proxy (based on mrouted)?
>
> https://github.com/mirror/dd-wrt/tree/master/src/router/igmp-proxy
>
> What is the actual vs. expected source address you are seeing on the
> IGMP packets?
this github mirror is unmaintained. (svn.dd-wrt.com is the correct 
repository)
but yes, but same applies to upstream https://github.com/pali/igmpproxy

havent check the source addresses right now. i basicly discovered that 
this patch breaks the igmp routing and all traffic stops
this here is from a working system with the reverted patch. if you 
really need that i break it again using the patch you need to wait a 
little bit

05:14:22.697962 IP 10.88.195.138 > 239.35.100.8: igmp v2 report 239.35.100.8
root@...llfast:/proc/4032/net# /tmp/ip mroute
(193.158.35.251, 239.35.20.4)    Iif: ppp0       Oifs: briptv
(10.88.193.141, 239.255.255.250) Iif: ppp0       Oifs: briptv
(10.88.193.145, 239.255.255.250) Iif: ppp0       Oifs: briptv
(10.88.195.138, 239.255.255.250) Iif: ppp0       Oifs: briptv
(10.88.195.129, 239.255.255.250) Iif: ppp0       Oifs: briptv
(10.88.193.134, 239.255.255.250) Iif: ppp0       Oifs: briptv
(10.88.195.1, 239.255.255.250)   Iif: ppp0       Oifs: briptv
(10.88.193.109, 239.255.255.250) Iif: ppp0       Oifs: br0
(10.88.193.145, 239.192.152.143) Iif: ppp0       Oifs: br0
(10.88.193.1, 239.255.255.250)   Iif: ppp0       Oifs: br0

>

-- 
Mit freundlichen Grüssen / Regards

Sebastian Gottschall / CTO

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