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
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