[lwip-devel] [bug #43105] IGMP Membership General Query being ignored

[Alex]

URL:
  <http://savannah.nongnu.org/bugs/?43105>

                 Summary: IGMP Membership General Query being ignored
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: arudzki
            Submitted on: Fri 29 Aug 2014 06:30:11 GMT
                Category: IPv4
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: 1.3.1

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Details:

In my project I join a single multicast group

I have noticed since adding a switch with IGMP Snooping onto my network that
IGMPv2 Membership General Queries on All hosts (224.0.0.1) addresses are being
ignored from my project devices running lwIP.

I managed to track the problem down to igmp.c - igmp_lookfor_group.
The if statement should be (group->interface == ifp) &&
(ip_addr_cmp(&(group->group_address), addr) || ip_addr_cmp(&allsystems,
addr))
so that the Membership Query on the All hosts address can pass through..

igmp_lookfor_group(...) blocks the Membership Query when it is called in
ip_input(...) and then would block again in igmp_input(...).




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