This is not intended to be committed as-is and should be split into
several pieces. For instance:
- dtrace probes can be moved to sctp_kdtrace.c separately
- rt_addrmsg eventhandler can be added separately
- addition of the SCTP_SUPPORT option can be done separately
There are some XXX comments that I plan to address.
My goal is to enable removal of SCTP from our GENERIC kernels: I believe
there are relatively few users, and SCTP presents a relatively large
attack surface. Consider that IPSEC has more users and is similarly not
in GENERIC; one can set ipsec_enable="YES" in /etc/rc.conf and have it
automatically be loaded.