netdev - Regarding processing IGMPv2 reports from a snooping switch

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Message-ID: <CADAe=++aQH+p-4HxOBa6tznOB=CKQbhyFCm=fMv7SZUR34jLVg@mail.gmail.com>
Date:	Fri, 24 May 2013 15:31:21 +0530
From:	Ajith Adapa <adapa.ajith@...il.com>
To:	netdev@...r.kernel.org
Subject: Regarding processing IGMPv2 reports from a snooping switch

Hi,

Router -- snooping switch -- host(s)

Router sends a general igmpv2 query which is forwarded to host(s).

Hosts reply back with report messages that they r intrested in group G
(i.e. 234.1.1.1) as destination address.

Let us say report suppression is enabled in igmp snooping switch. So
switch sends a single report message to router with source address as
0.0.0.0 and destination address as group address  G (for e.g.
234.1.1.1).

But linux kernel in multicast router is dropping the packet.

in ipv4/route.c in ip_route_input_mc function

        if (ipv4_is_zeronet(saddr)) {
                if (!ipv4_is_local_multicast(daddr))
                        goto e_inval;

Ideally packet is dropped in above code. Is it expected behaviour ?

Regards,
Ajith
--------------------------------------------
codingfreak.in
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