FreeBSD/src d6e23cf (r353480)sys/net route.c, sys/netinet sctp_bsd_addr.c sctp_usrreq.c

Use an event handler to notify the SCTP about IP address changes
instead of calling an SCTP specific function from the IP code.
This is a requirement of supporting SCTP as a kernel loadable module.
This patch was developed by markj@, I tweaked a bit the SCTP related
code.

Submitted by:           markj@
MFC after:              3 days
DeltaFile
+4-20sys/net/route.c
+6-0sys/netinet/sctp_bsd_addr.c
+5-0sys/sys/eventhandler.h
+3-0sys/netinet/sctp_usrreq.c
+2-0sys/netinet/sctp_bsd_addr.h
+20-205 files

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