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[lwip-devel] [bug #43596] IGMP queries from 0.0.0.0 are discarded


From: Ben Hastings
Subject: [lwip-devel] [bug #43596] IGMP queries from 0.0.0.0 are discarded
Date: Thu, 13 Nov 2014 06:48:37 +0000
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.111 Safari/537.36

URL:
  <http://savannah.nongnu.org/bugs/?43596>

                 Summary: IGMP queries from 0.0.0.0 are discarded
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: hastings
            Submitted on: Thu 13 Nov 2014 01:48:36 AM EST
                Category: IPv4
                Severity: 3 - Normal
              Item Group: Change Request
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: 1.4.1

    _______________________________________________________

Details:

Experiencing an issue with LwIP in a network with an IGMP snooping switch. 
The switch is not an actual multicast router, so it sends general membership
queries with a source address of 0.0.0.0.  This appears to be in line with RFC
4541, however LwIP discards the packets due to the bogus source address.  This
causes the IGMP code to never respond with a membership report and the switch
to stop forwarding multicast packets on that port.

The attached patch to ip.c allows packets with an all zero source address and
the all systems (224.0.0.1) destination address to be passed to the IGMP code.



    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Thu 13 Nov 2014 01:48:36 AM EST  Name: ip_igmp_src_addr.patch  Size:
617B   By: hastings

<http://savannah.nongnu.org/bugs/download.php?file_id=32426>

    _______________________________________________________

Reply to this item at:

  <http://savannah.nongnu.org/bugs/?43596>

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