From owner-freebsd-net  Thu Sep 20  8:21:25 2001
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From: "Wilbert de Graaf" <wilbertdg@hetnet.nl>
To: "deepika kakrania" <deepika_77@yahoo.com>
Cc: <freebsd-net@FreeBSD.ORG>
References: <20010920110649.75508.qmail@web11203.mail.yahoo.com>
Subject: Re: IP multicasting...
Date: Thu, 20 Sep 2001 08:21:21 -0700
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Hello Deepika,

> But where is the handling of other case where a IGMPv2
> router sends the GENERAL QUERY(igmp_group.s_addr = 0).
> In this case igmp_code is non-zero. In other words,
> where is the validity check for general Query message
> when it comes from IGMPV2 router??
>
> Can anyone tell me where it's done?

It's this line:

if (igmp->igmp_group.s_addr != 0 &&
    !IN_MULTICAST(ntohl(igmp->igmp_group.s_addr))) {
    ++igmpstat.igps_rcv_badqueries;
    m_freem(m);
    return;
}

This test gets executed when it's a v2 query (mtu != 0). The test stops
further processing if the group address is NOT "0.0.0.0" or NOT a valid
multicast address.

Wilbert



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