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From: Bruce M Simpson <bms@FreeBSD.org>
Date: Sun, 14 May 2006 14:22:49 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
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Subject: cvs commit: src/sys/netinet in.h ip_output.c ip_var.h
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bms         2006-05-14 14:22:49 UTC

  FreeBSD src repository

  Modified files:
    sys/netinet          in.h ip_output.c ip_var.h 
  Log:
  Fix a long-standing limitation in IPv4 multicast group membership.
  
  By making the imo_membership array a dynamically allocated vector,
  this minimizes disruption to existing IPv4 multicast code. This
  change breaks the ABI for the kernel module ip_mroute.ko, and may
  cause a small amount of churn for folks working on the IGMPv3 merge.
  
  Previously, sockets were subject to a compile-time limitation on
  the number of IPv4 group memberships, which was hard-coded to 20.
  The imo_membership relationship, however, is 1:1 with regards to
  a tuple of multicast group address and interface address. Users who
  ran routing protocols such as OSPF ran into this limitation on machines
  with a large system interface tree.
  
  Revision  Changes    Path
  1.96      +8 -1      src/sys/netinet/in.h
  1.256     +29 -1     src/sys/netinet/ip_output.c
  1.98      +3 -2      src/sys/netinet/ip_var.h