netdev - Regarding processing IGMPv2 reports from a snooping switch

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

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
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html