Index: share/man/man4/sctp.4
===================================================================
--- share/man/man4/sctp.4
+++ share/man/man4/sctp.4
@@ -26,7 +26,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd December 15, 2006
+.Dd September 7, 2015
 .Dt SCTP 4
 .Os
 .Sh NAME
@@ -168,7 +168,7 @@
 This extension allows a user on either side to reset the
 stream sequence numbers used by any or all streams.
 .El
-.Pp
+.Ss Socket Options
 .Tn SCTP
 supports a number of socket options which can be set with
 .Xr setsockopt 2
@@ -409,6 +409,164 @@
 endpoint must also support the stream reset extension
 as well.
 .El
+.Ss MIB Variables
+The
+.Tn SCTP
+protocol implements a number of variables in the
+.Va net.inet.sctp
+branch of the
+.Xr sysctl 3
+MIB.
+.Bl -tag -width ".Va default_frag_interleave"
+.It getcred
+Get the ucred of a SCTP connection
+.It assoclist
+List of active SCTP associations
+.It stats
+SCTP statistics (struct sctp_stat)
+.It diag_info_code
+Diagnostic information error cause code
+.It blackhole
+Enable SCTP blackholing. See
+.Xr blackhole 4
+for more details.
+.It use_dcccecn
+Enable for RTCC CC datacenter ECN
+.It rttvar_steady_step
+How many the sames it takes to try step down of cwnd
+.It rttvar_eqret
+What to return when rtt and bw are unchanged
+.It rttvar_rtt
+Shift amount for rtt smoothing on rtt calc
+.It rttvar_bw
+Shift amount for bw smoothing on rtt calc
+.It initial_cwnd
+Initial congestion window in MTUs
+.It buffer_splitting
+Enable send/receive buffer splitting.
+.It vtag_time_wait
+Vtag time wait time in seconds, 0 disables it.
+.It nat_friendly_init
+Enable sending of the nat-friendly SCTP option on INITs.
+.It enable_sack_immediately
+Enable sending of the SACK-IMMEDIATELY-bit.
+.It udp_tunneling_port
+Set the SCTP/UDP tunneling port
+.It mobility_fasthandoff
+Enable SCTP fast handoff
+.It mobility_base
+Enable SCTP base mobility
+.It default_frag_interleave
+Default fragment interleave level
+.It default_ss_module
+Default stream scheduling module
+.It default_cc_module
+Default congestion control module
+.It log_level
+Ltrace/KTR trace logging level
+.It max_retran_chunk
+Maximum times an unlucky chunk can be retran'd before assoc abort
+.It min_residual
+Minimum residual data chunk in second part of split
+.It strict_data_order
+Enforce strict data ordering, abort if control inside data
+.It abort_at_limit
+When one-2-one hits qlimit abort
+.It hb_max_burst
+Confirmation Heartbeat max burst
+.It do_sctp_drain
+Should SCTP respond to the drain calls
+.It max_chained_mbufs
+Default max number of small mbufs on a chain
+.It abc_l_var
+SCTP ABC max increase per SACK (L)
+.It nat_friendly
+SCTP NAT friendly operation
+.It cwnd_maxburst
+Use a CWND adjusting maxburst
+.It cmt_use_dac
+CMT DAC on/off flag
+.It cmt_on_off
+CMT settings
+.It outgoing_streams
+Default number of outgoing streams
+.It incoming_streams
+Default number of incoming streams
+.It add_more_on_output
+When space-wise is it worthwhile to try to add more to a socket send buffer
+.It path_pf_threshold
+Default potentially failed threshold
+.It path_rtx_max
+Default maximum of retransmissions per path
+.It assoc_rtx_max
+Default maximum number of retransmissions per association
+.It init_rtx_max
+Default maximum number of retransmission for INIT chunks
+.It valid_cookie_life
+Default cookie lifetime in seconds
+.It init_rto_max
+Default maximum retransmission timeout during association setup in ms
+.It rto_initial
+Default initial retransmission timeout in ms
+.It rto_min
+Default minimum retransmission timeout in ms
+.It rto_max
+Default maximum retransmission timeout in ms
+.It secret_lifetime
+Default secret lifetime in seconds
+.It shutdown_guard_time
+Shutdown guard timer in seconds (0 means 5 times RTO.Max)
+.It pmtu_raise_time
+Default PMTU raise timer in seconds
+.It heartbeat_interval
+Default heartbeat interval in ms
+.It asoc_resource
+Max number of cached resources in an asoc
+.It sys_resource
+Max number of cached resources in the system
+.It sack_freq
+Default SACK frequency
+.It delayed_sack_time
+Default delayed SACK timer in ms
+.It chunkscale
+Tunable for Scaling of number of chunks and messages
+.It min_split_point
+Minimum size when splitting a chunk
+.It pcbhashsize
+Tunable for PCB hash table sizes
+.It tcbhashsize
+Tunable for TCB hash table sizes
+.It maxchunks
+Default max chunks on queue per asoc
+.It fr_maxburst
+Default fr max burst for sctp endpoints
+.It maxburst
+Default max burst for sctp endpoints
+.It peer_chkoh
+Amount to debit peers rwnd per chunk sent
+.It strict_sacks
+Enable SCTP Strict SACK checking
+.It pktdrop_enable
+Enable SCTP PKTDROP
+.It nrsack_enable
+Enable SCTP NR-SACK
+.It reconfig_enable
+Enable SCTP RE-CONFIG
+.It asconf_enable
+Enable SCTP ASCONF
+.It auth_enable
+Enable SCTP AUTH function
+.It pr_enable
+Enable PR-SCTP
+.It ecn_enable
+Enable SCTP ECN
+.It auto_asconf
+Enable SCTP Auto-ASCONF
+.It recvspace
+Maximum incoming SCTP buffer size
+.It sendspace
+Maximum outgoing SCTP buffer size
+.El
 .Sh SEE ALSO
 .Xr accept 2 ,
 .Xr bind 2 ,
@@ -418,4 +576,5 @@
 .Xr sctp_connectx 3 ,
 .Xr sctp_opt_info 3 ,
 .Xr sctp_recvmsg 3 ,
-.Xr sctp_sendmsg 3
+.Xr sctp_sendmsg 3 ,
+.Xr blackhole 4