[lwip-devel] [bug #50220] mld6_leavegroup does not send ICMP6_TYPE_MLD, even if last reporter

[Luc Revardel]

URL:
  <http://savannah.nongnu.org/bugs/?50220>

                 Summary: mld6_leavegroup does not send ICMP6_TYPE_MLD, even
if last reporter
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: lrevardel
            Submitted on: Fri 03 Feb 2017 02:14:14 PM GMT
                Category: IPv6
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: 2.0.0

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Details:

Issue:
mld6_leavegroup() should generate an ICMP6 packet (ICMP6_TYPE_MLD) when the
host is the last one that reported ICMP6_TYPE_MLR for the specified group.
This packet is never sent, even when the host is the last reporter.

Root cause:
group->last_reporter_flag is never set to one.

Possible fix:
As done for IGMP, this flag could be set to one in mld6_send(), when the sent
packet is ICMP6_TYPE_MLR.

Tested version: STABLE-2_0_0_RC2

Behavior observed while attempting a group leave on FF15::1, after successful
group add and no other host on the network.




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