text: /*-
   * SPDX-License-Identifier: BSD-3-Clause
   *
   * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * a) Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   *
   * b) Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the distribution.
   *
   * c) Neither the name of Cisco Systems, Inc. nor the names of its
   *    contributors may be used to endorse or promote products derived
   *    from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   * THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifdef __FreeBSD__
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD: head/sys/netinet/sctp_structs.h 345467 2019-03-24 12:13:05Z tuexen $");
  #endif
  
  #ifndef _NETINET_SCTP_STRUCTS_H_
  #define _NETINET_SCTP_STRUCTS_H_
  
  #include <netinet/sctp_os.h>
  #include <netinet/sctp_header.h>
  #include <netinet/sctp_auth.h>
  
  struct sctp_timer {
  	sctp_os_timer_t timer;
  
  	int type;
  	/*
  	 * Depending on the timer type these will be setup and cast with the
  	 * appropriate entity.
  	 */
  	void *ep;
  	void *tcb;
  	void *net;
  #if defined(__FreeBSD__) && __FreeBSD_version >= 800000
  	void *vnet;
  #endif
  
  	/* for sanity checking */
  	void *self;
  	uint32_t ticks;
  	uint32_t stopped_from;
  };
  
  
  struct sctp_foo_stuff {
  	struct sctp_inpcb *inp;
  	uint32_t        lineno;
  	uint32_t        ticks;
  	int             updown;
  };
  
  
  /*
   * This is the information we track on each interface that we know about from
   * the distant end.
   */
  TAILQ_HEAD(sctpnetlisthead, sctp_nets);
  
  struct sctp_stream_reset_list {
  	TAILQ_ENTRY(sctp_stream_reset_list) next_resp;
  	uint32_t seq;
  	uint32_t tsn;
  	uint32_t number_entries;
  	uint16_t list_of_streams[];
  };
  
  TAILQ_HEAD(sctp_resethead, sctp_stream_reset_list);
  
  /*
   * Users of the iterator need to malloc a iterator with a call to
   * sctp_initiate_iterator(inp_func, assoc_func, inp_func,  pcb_flags, pcb_features,
   *     asoc_state, void-ptr-arg, uint32-arg, end_func, inp);
   *
   * Use the following two defines if you don't care what pcb flags are on the EP
   * and/or you don't care what state the association is in.
   *
   * Note that if you specify an INP as the last argument then ONLY each
   * association of that single INP will be executed upon. Note that the pcb
   * flags STILL apply so if the inp you specify has different pcb_flags then
   * what you put in pcb_flags nothing will happen. use SCTP_PCB_ANY_FLAGS to
   * assure the inp you specify gets treated.
   */
  #define SCTP_PCB_ANY_FLAGS	0x00000000
  #define SCTP_PCB_ANY_FEATURES	0x00000000
  #define SCTP_ASOC_ANY_STATE	0x00000000
  
  typedef void (*asoc_func) (struct sctp_inpcb *, struct sctp_tcb *, void *ptr,
           uint32_t val);
  typedef int (*inp_func) (struct sctp_inpcb *, void *ptr, uint32_t val);
  typedef void (*end_func) (void *ptr, uint32_t val);
  
  #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
  /* whats on the mcore control struct */
  struct sctp_mcore_queue {
  	TAILQ_ENTRY(sctp_mcore_queue) next;
  #if defined(__FreeBSD__) && __FreeBSD_version >= 801000
  	struct vnet *vn;
  #endif
  	struct mbuf *m;
  	int off;
  	int v6;
  };
  
  TAILQ_HEAD(sctp_mcore_qhead, sctp_mcore_queue);
  
  struct sctp_mcore_ctrl {
  	SCTP_PROCESS_STRUCT thread_proc;
  	struct sctp_mcore_qhead que;
  	struct mtx core_mtx;
  	struct mtx que_mtx;
  	int running;
  	int cpuid;
  };
  
  
  #endif
  
  
  struct sctp_iterator {
  	TAILQ_ENTRY(sctp_iterator) sctp_nxt_itr;
  #if defined(__FreeBSD__) && __FreeBSD_version >= 801000
  	struct vnet *vn;
  #endif
  	struct sctp_timer tmr;
  	struct sctp_inpcb *inp;		/* current endpoint */
  	struct sctp_tcb *stcb;		/* current* assoc */
  	struct sctp_inpcb *next_inp;    /* special hook to skip to */
  	asoc_func function_assoc;	/* per assoc function */
  	inp_func function_inp;		/* per endpoint function */
  	inp_func function_inp_end;	/* end INP function */
  	end_func function_atend;	/* iterator completion function */
  	void *pointer;			/* pointer for apply func to use */
  	uint32_t val;			/* value for apply func to use */
  	uint32_t pcb_flags;		/* endpoint flags being checked */
  	uint32_t pcb_features;		/* endpoint features being checked */
  	uint32_t asoc_state;		/* assoc state being checked */
  	uint32_t iterator_flags;
  	uint8_t  no_chunk_output;
  	uint8_t  done_current_ep;
  };
  /* iterator_flags values */
  #define SCTP_ITERATOR_DO_ALL_INP	0x00000001
  #define SCTP_ITERATOR_DO_SINGLE_INP	0x00000002
  
  
  TAILQ_HEAD(sctpiterators, sctp_iterator);
  
  struct sctp_copy_all {
  	struct sctp_inpcb *inp;	/* ep */
  	struct mbuf *m;
  	struct sctp_sndrcvinfo sndrcv;
  	ssize_t sndlen;
  	int cnt_sent;
  	int cnt_failed;
  };
  
  struct sctp_asconf_iterator {
  	struct sctpladdr list_of_work;
  	int cnt;
  };
  
  struct iterator_control {
  #if defined(__FreeBSD__)
  	struct mtx ipi_iterator_wq_mtx;
  	struct mtx it_mtx;
  #elif defined(__APPLE__)
  	lck_mtx_t *ipi_iterator_wq_mtx;
  	lck_mtx_t *it_mtx;
  #elif defined(SCTP_PROCESS_LEVEL_LOCKS)
  #if defined(__Userspace__)
  	userland_mutex_t ipi_iterator_wq_mtx;
  	userland_mutex_t it_mtx;
  	userland_cond_t iterator_wakeup;
  #else
  	pthread_mutex_t ipi_iterator_wq_mtx;
  	pthread_mutex_t it_mtx;
  	pthread_cond_t iterator_wakeup;
  #endif
  #elif defined(__Windows__)
  	struct spinlock it_lock;
  	struct spinlock ipi_iterator_wq_lock;
  	KEVENT iterator_wakeup[2];
  	PFILE_OBJECT iterator_thread_obj;
  #else
  	void *it_mtx;
  #endif
  #if !defined(__Windows__)
  #if !defined(__Userspace__)
  	SCTP_PROCESS_STRUCT thread_proc;
  #else
  	userland_thread_t thread_proc;
  #endif
  #endif
  	struct sctpiterators iteratorhead;
  	struct sctp_iterator *cur_it;
  	uint32_t iterator_running;
  	uint32_t iterator_flags;
  };
  #if !defined(__FreeBSD__)
  #define SCTP_ITERATOR_MUST_EXIT		0x00000001
  #define SCTP_ITERATOR_EXITED		0x00000002
  #endif
  #define SCTP_ITERATOR_STOP_CUR_IT	0x00000004
  #define SCTP_ITERATOR_STOP_CUR_INP	0x00000008
  
  struct sctp_net_route {
  	sctp_rtentry_t *ro_rt;
  #if defined(__FreeBSD__)
  #if __FreeBSD_version < 1100093
  #if __FreeBSD_version >= 800000
  	void *ro_lle;
  #endif
  #if __FreeBSD_version >= 900000
  	void *ro_ia;
  	int ro_flags;
  #endif
  #else
  #if __FreeBSD_version >= 1100116
  	struct llentry *ro_lle;
  #endif
  	char		*ro_prepend;
  	uint16_t	ro_plen;
  	uint16_t	ro_flags;
  	uint16_t	ro_mtu;
  	uint16_t	spare;
  #endif
  #endif
  #if defined(__APPLE__)
  #if !defined(APPLE_LEOPARD) && !defined(APPLE_SNOWLEOPARD) && !defined(APPLE_LION) && !defined(APPLE_MOUNTAINLION) && !defined(APPLE_ELCAPITAN)
  	struct llentry	*ro_lle;
  #endif
  #if !defined(APPLE_LEOPARD) && !defined(APPLE_SNOWLEOPARD) && !defined(APPLE_LION) && !defined(APPLE_MOUNTAINLION)
  	struct ifaddr *ro_srcia;
  #endif
  #if !defined(APPLE_LEOPARD)
  	uint32_t ro_flags;
  #endif
  #endif
  	union sctp_sockstore _l_addr;	/* remote peer addr */
  	struct sctp_ifa *_s_addr;	/* our selected src addr */
  };
  
  struct htcp {
  	uint16_t	alpha;		/* Fixed point arith, << 7 */
  	uint8_t		beta;           /* Fixed point arith, << 7 */
  	uint8_t		modeswitch;     /* Delay modeswitch until we had at least one congestion event */
  	uint32_t	last_cong;	/* Time since last congestion event end */
  	uint32_t	undo_last_cong;
  	uint16_t	bytes_acked;
  	uint32_t	bytecount;
  	uint32_t	minRTT;
  	uint32_t	maxRTT;
  
  	uint32_t	undo_maxRTT;
  	uint32_t	undo_old_maxB;
  
  	/* Bandwidth estimation */
  	uint32_t	minB;
  	uint32_t	maxB;
  	uint32_t	old_maxB;
  	uint32_t	Bi;
  	uint32_t	lasttime;
  };
  
  struct rtcc_cc {
  	struct timeval tls;   /* The time we started the sending  */
  	uint64_t lbw;         /* Our last estimated bw */
  	uint64_t lbw_rtt;     /* RTT at bw estimate */
  	uint64_t bw_bytes;    /* The total bytes since this sending began */
  	uint64_t bw_tot_time; /* The total time since sending began */
  	uint64_t new_tot_time;  /* temp holding the new value */
  	uint64_t bw_bytes_at_last_rttc; /* What bw_bytes was at last rtt calc */
  	uint32_t cwnd_at_bw_set; /* Cwnd at last bw saved - lbw */
  	uint32_t vol_reduce;  /* cnt of voluntary reductions */
  	uint16_t steady_step; /* The number required to be in steady state*/
  	uint16_t step_cnt;    /* The current number */
  	uint8_t  ret_from_eq;  /* When all things are equal what do I return 0/1 - 1 no cc advance */
  	uint8_t  use_dccc_ecn;  /* Flag to enable DCCC ECN */
  	uint8_t  tls_needs_set; /* Flag to indicate we need to set tls 0 or 1 means set at send 2 not */
  	uint8_t  last_step_state; /* Last state if steady state stepdown is on */
  	uint8_t  rtt_set_this_sack; /* Flag saying this sack had RTT calc on it */
  	uint8_t  last_inst_ind; /* Last saved inst indication */
  };
  
  
  struct sctp_nets {
  	TAILQ_ENTRY(sctp_nets) sctp_next;	/* next link */
  
  	/*
  	 * Things on the top half may be able to be split into a common
  	 * structure shared by all.
  	 */
  	struct sctp_timer pmtu_timer;
  	struct sctp_timer hb_timer;
  
  	/*
  	 * The following two in combination equate to a route entry for v6
  	 * or v4.
  	 */
  	struct sctp_net_route ro;
  
  	/* mtu discovered so far */
  	uint32_t mtu;
  	uint32_t ssthresh;	/* not sure about this one for split */
  	uint32_t last_cwr_tsn;
  	uint32_t cwr_window_tsn;
  	uint32_t ecn_ce_pkt_cnt;
  	uint32_t lost_cnt;
  	/* smoothed average things for RTT and RTO itself */
  	int lastsa;
  	int lastsv;
  	uint64_t rtt; /* last measured rtt value in us */
  	unsigned int RTO;
  
  	/* This is used for SHUTDOWN/SHUTDOWN-ACK/SEND or INIT timers */
  	struct sctp_timer rxt_timer;
  
  	/* last time in seconds I sent to it */
  	struct timeval last_sent_time;
  	union cc_control_data {
  		struct htcp htcp_ca; 	/* JRS - struct used in HTCP algorithm */
  		struct rtcc_cc rtcc;    /* rtcc module cc stuff  */
  	} cc_mod;
  	int ref_count;
  
  	/* Congestion stats per destination */
  	/*
  	 * flight size variables and such, sorry Vern, I could not avoid
  	 * this if I wanted performance :>
  	 */
  	uint32_t flight_size;
  	uint32_t cwnd;		/* actual cwnd */
  	uint32_t prev_cwnd;	/* cwnd before any processing */
  	uint32_t ecn_prev_cwnd;	/* ECN prev cwnd at first ecn_echo seen in new window */
  	uint32_t partial_bytes_acked;	/* in CA tracks when to incr a MTU */
  	/* tracking variables to avoid the aloc/free in sack processing */
  	unsigned int net_ack;
  	unsigned int net_ack2;
  
  	/*
  	 * JRS - 5/8/07 - Variable to track last time
  	 *  a destination was active for CMT PF
  	 */
  	uint32_t last_active;
  
  	/*
  	 * CMT variables (iyengar@cis.udel.edu)
  	 */
  	uint32_t this_sack_highest_newack;	/* tracks highest TSN newly
  						 * acked for a given dest in
  						 * the current SACK. Used in
  						 * SFR and HTNA algos */
  	uint32_t pseudo_cumack;	/* CMT CUC algorithm. Maintains next expected
  				 * pseudo-cumack for this destination */
  	uint32_t rtx_pseudo_cumack;	/* CMT CUC algorithm. Maintains next
  					 * expected pseudo-cumack for this
  					 * destination */
  
  	/* CMT fast recovery variables */
  	uint32_t fast_recovery_tsn;
  	uint32_t heartbeat_random1;
  	uint32_t heartbeat_random2;
  #ifdef INET6
  	uint32_t flowlabel;
  #endif
  	uint8_t dscp;
  
  	struct timeval start_time;      /* time when this net was created */
  	uint32_t marked_retrans;        /* number or DATA chunks marked for
  	                                   timer based retransmissions */
  	uint32_t marked_fastretrans;
  	uint32_t heart_beat_delay;      /* Heart Beat delay in ms */
  
  	/* if this guy is ok or not ... status */
  	uint16_t dest_state;
  	/* number of timeouts to consider the destination unreachable */
  	uint16_t failure_threshold;
  	/* number of timeouts to consider the destination potentially failed */
  	uint16_t pf_threshold;
  	/* error stats on the destination */
  	uint16_t error_count;
  	/* UDP port number in case of UDP tunneling */
  	uint16_t port;
  
  	uint8_t fast_retran_loss_recovery;
  	uint8_t will_exit_fast_recovery;
  	/* Flags that probably can be combined into dest_state */
  	uint8_t fast_retran_ip;	/* fast retransmit in progress */
  	uint8_t hb_responded;
  	uint8_t saw_newack;	/* CMT's SFR algorithm flag */
  	uint8_t src_addr_selected;	/* if we split we move */
  	uint8_t indx_of_eligible_next_to_use;
  	uint8_t addr_is_local;	/* its a local address (if known) could move
  				 * in split */
  
  	/*
  	 * CMT variables (iyengar@cis.udel.edu)
  	 */
  	uint8_t find_pseudo_cumack;	/* CMT CUC algorithm. Flag used to
  					 * find a new pseudocumack. This flag
  					 * is set after a new pseudo-cumack
  					 * has been received and indicates
  					 * that the sender should find the
  					 * next pseudo-cumack expected for
  					 * this destination */
  	uint8_t find_rtx_pseudo_cumack;	/* CMT CUCv2 algorithm. Flag used to
  					 * find a new rtx-pseudocumack. This
  					 * flag is set after a new
  					 * rtx-pseudo-cumack has been received
  					 * and indicates that the sender
  					 * should find the next
  					 * rtx-pseudo-cumack expected for this
  					 * destination */
  	uint8_t new_pseudo_cumack;	/* CMT CUC algorithm. Flag used to
  					 * indicate if a new pseudo-cumack or
  					 * rtx-pseudo-cumack has been received */
  	uint8_t window_probe;		/* Doing a window probe? */
  	uint8_t RTO_measured;		/* Have we done the first measure */
  	uint8_t last_hs_used;	/* index into the last HS table entry we used */
  	uint8_t lan_type;
  	uint8_t rto_needed;
  #if defined(__FreeBSD__)
  	uint32_t flowid;
  	uint8_t flowtype;
  #endif
  #if defined(__Userspace__) || defined(__FreeBSD__)
  	uint8_t got_max;
  #endif
  	uint32_t probed_size; /* size being probed for */
  	uint32_t plpmtu; /* confirmed plpmtu */
  	uint32_t max_pmtu;
  	uint16_t probe_count; /* Counter for the probing attempts */
  	uint16_t probing_state;
  	uint8_t mtu_probing; /* Flag to indicate whether mtu_probing should be processed */
  };
  
  
  struct sctp_data_chunkrec {
  	uint32_t tsn;		/* the TSN of this transmit */
  	uint32_t mid;		/* the message identifier of this transmit */
  	uint16_t sid;		/* the stream number of this guy */
  	uint32_t ppid;
  	uint32_t context;	/* from send */
  	uint32_t cwnd_at_send;
  	/*
  	 * part of the Highest sacked algorithm to be able to stroke counts
  	 * on ones that are FR'd.
  	 */
  	uint32_t fast_retran_tsn;	/* sending_seq at the time of FR */
  	struct timeval timetodrop;	/* time we drop it from queue */
  	uint32_t fsn;			/* Fragment Sequence Number */
  	uint8_t doing_fast_retransmit;
  	uint8_t rcv_flags;	/* flags pulled from data chunk on inbound for
  				 * outbound holds sending flags for PR-SCTP.
  				 */
  	uint8_t state_flags;
  	uint8_t chunk_was_revoked;
  	uint8_t fwd_tsn_cnt;
  };
  
  TAILQ_HEAD(sctpchunk_listhead, sctp_tmit_chunk);
  
  /* The lower byte is used to enumerate PR_SCTP policies */
  #define CHUNK_FLAGS_PR_SCTP_TTL	        SCTP_PR_SCTP_TTL
  #define CHUNK_FLAGS_PR_SCTP_BUF	        SCTP_PR_SCTP_BUF
  #define CHUNK_FLAGS_PR_SCTP_RTX         SCTP_PR_SCTP_RTX
  
  /* The upper byte is used as a bit mask */
  #define CHUNK_FLAGS_FRAGMENT_OK	        0x0100
  
  struct chk_id {
  	uint8_t id;
  	uint8_t can_take_data;
  };
  
  
  struct sctp_tmit_chunk {
  	union {
  		struct sctp_data_chunkrec data;
  		struct chk_id chunk_id;
  	}     rec;
  	struct sctp_association *asoc;	/* bp to asoc this belongs to */
  	struct timeval sent_rcv_time;	/* filled in if RTT being calculated */
  	struct mbuf *data;	/* pointer to mbuf chain of data */
  	struct mbuf *last_mbuf;	/* pointer to last mbuf in chain */
  	struct sctp_nets *whoTo;
  	TAILQ_ENTRY(sctp_tmit_chunk) sctp_next;	/* next link */
  	int32_t sent;		/* the send status */
  	uint16_t snd_count;	/* number of times I sent */
  	uint16_t flags;		/* flags, such as FRAGMENT_OK */
  	uint16_t send_size;
  	uint16_t book_size;
  	uint16_t mbcnt;
  	uint16_t auth_keyid;
  	uint8_t holds_key_ref;	/* flag if auth keyid refcount is held */
  	uint8_t pad_inplace;
  	uint8_t do_rtt;
  	uint8_t book_size_scale;
  	uint8_t no_fr_allowed;
  	uint8_t copy_by_ref;
  	uint8_t window_probe;
  };
  
  struct sctp_queued_to_read {	/* sinfo structure Pluse more */
  	uint16_t sinfo_stream;	/* off the wire */
  	uint16_t sinfo_flags;	/* SCTP_UNORDERED from wire use SCTP_EOF for
  				 * EOR */
  	uint32_t sinfo_ppid;	/* off the wire */
  	uint32_t sinfo_context;	/* pick this up from assoc def context? */
  	uint32_t sinfo_timetolive;	/* not used by kernel */
  	uint32_t sinfo_tsn;	/* Use this in reassembly as first TSN */
  	uint32_t sinfo_cumtsn;	/* Use this in reassembly as last TSN */
  	sctp_assoc_t sinfo_assoc_id;	/* our assoc id */
  	/* Non sinfo stuff */
  	uint32_t mid;		/* Fragment Index */
  	uint32_t length;	/* length of data */
  	uint32_t held_length;	/* length held in sb */
  	uint32_t top_fsn;	/* Highest FSN in queue */
  	uint32_t fsn_included;  /* Highest FSN in *data portion */
  	struct sctp_nets *whoFrom;	/* where it came from */
  	struct mbuf *data;	/* front of the mbuf chain of data with
  				 * PKT_HDR */
  	struct mbuf *tail_mbuf;	/* used for multi-part data */
  	struct mbuf *aux_data;  /* used to hold/cache  control if o/s does not take it from us */
  	struct sctp_tcb *stcb;	/* assoc, used for window update */
  	TAILQ_ENTRY(sctp_queued_to_read) next;
  	TAILQ_ENTRY(sctp_queued_to_read) next_instrm;
  	struct sctpchunk_listhead reasm;
  	uint16_t port_from;
  	uint16_t spec_flags;	/* Flags to hold the notification field */
  	uint8_t  do_not_ref_stcb;
  	uint8_t  end_added;
  	uint8_t  pdapi_aborted;
  	uint8_t  pdapi_started;
  	uint8_t  some_taken;
  	uint8_t  last_frag_seen;
  	uint8_t  first_frag_seen;
  	uint8_t  on_read_q;
  	uint8_t  on_strm_q;
  };
  
  #define SCTP_ON_ORDERED 1
  #define SCTP_ON_UNORDERED 2
  
  /* This data structure will be on the outbound
   * stream queues. Data will be pulled off from
   * the front of the mbuf data and chunk-ified
   * by the output routines. We will custom
   * fit every chunk we pull to the send/sent
   * queue to make up the next full packet
   * if we can. An entry cannot be removed
   * from the stream_out queue until
   * the msg_is_complete flag is set. This
   * means at times data/tail_mbuf MIGHT
   * be NULL.. If that occurs it happens
   * for one of two reasons. Either the user
   * is blocked on a send() call and has not
   * awoken to copy more data down... OR
   * the user is in the explict MSG_EOR mode
   * and wrote some data, but has not completed
   * sending.
   */
  struct sctp_stream_queue_pending {
  	struct mbuf *data;
  	struct mbuf *tail_mbuf;
  	struct timeval ts;
  	struct sctp_nets *net;
  	TAILQ_ENTRY (sctp_stream_queue_pending) next;
  	TAILQ_ENTRY (sctp_stream_queue_pending) ss_next;
  	uint32_t fsn;
  	uint32_t length;
  	uint32_t timetolive;
  	uint32_t ppid;
  	uint32_t context;
  	uint16_t sinfo_flags;
  	uint16_t sid;
  	uint16_t act_flags;
  	uint16_t auth_keyid;
  	uint8_t  holds_key_ref;
  	uint8_t  msg_is_complete;
  	uint8_t  some_taken;
  	uint8_t  sender_all_done;
  	uint8_t  put_last_out;
  	uint8_t  discard_rest;
  };
  
  /*
   * this struct contains info that is used to track inbound stream data and
   * help with ordering.
   */
  TAILQ_HEAD(sctpwheelunrel_listhead, sctp_stream_in);
  struct sctp_stream_in {
  	struct sctp_readhead inqueue;
  	struct sctp_readhead uno_inqueue;
  	uint32_t last_mid_delivered;	/* used for re-order */
  	uint16_t sid;
  	uint8_t  delivery_started;
  	uint8_t  pd_api_started;
  };
  
  TAILQ_HEAD(sctpwheel_listhead, sctp_stream_out);
  TAILQ_HEAD(sctplist_listhead, sctp_stream_queue_pending);
  
  
  /* Round-robin schedulers */
  struct ss_rr {
  	/* next link in wheel */
  	TAILQ_ENTRY(sctp_stream_out) next_spoke;
  };
  
  /* Priority scheduler */
  struct ss_prio {
  	/* next link in wheel */
  	TAILQ_ENTRY(sctp_stream_out) next_spoke;
  	/* priority id */
  	uint16_t priority;
  };
  
  /* Fair Bandwidth scheduler */
  struct ss_fb {
  	/* next link in wheel */
  	TAILQ_ENTRY(sctp_stream_out) next_spoke;
  	/* stores message size */
  	int32_t rounds;
  };
  
  /*
   * This union holds all data necessary for
   * different stream schedulers.
   */
  struct scheduling_data {
  	struct sctp_stream_out *locked_on_sending;
  	/* circular looking for output selection */
  	struct sctp_stream_out *last_out_stream;
  	union {
  		struct sctpwheel_listhead wheel;
  		struct sctplist_listhead list;
  	} out;
  };
  
  /*
   * This union holds all parameters per stream
   * necessary for different stream schedulers.
   */
  union scheduling_parameters {
  	struct ss_rr rr;
  	struct ss_prio prio;
  	struct ss_fb fb;
  };
  
  /* States for outgoing streams */
  #define SCTP_STREAM_CLOSED           0x00
  #define SCTP_STREAM_OPENING          0x01
  #define SCTP_STREAM_OPEN             0x02
  #define SCTP_STREAM_RESET_PENDING    0x03
  #define SCTP_STREAM_RESET_IN_FLIGHT  0x04
  
  #define SCTP_MAX_STREAMS_AT_ONCE_RESET 200
  
  /* This struct is used to track the traffic on outbound streams */
  struct sctp_stream_out {
  	struct sctp_streamhead outqueue;
  	union scheduling_parameters ss_params;
  	uint32_t chunks_on_queues;      /* send queue and sent queue */
  #if defined(SCTP_DETAILED_STR_STATS)
  	uint32_t abandoned_unsent[SCTP_PR_SCTP_MAX + 1];
  	uint32_t abandoned_sent[SCTP_PR_SCTP_MAX + 1];
  #else
  	/* Only the aggregation */
  	uint32_t abandoned_unsent[1];
  	uint32_t abandoned_sent[1];
  #endif
  	/* For associations using DATA chunks, the lower 16-bit of
  	 * next_mid_ordered are used as the next SSN.
  	 */
  	uint32_t next_mid_ordered;
  	uint32_t next_mid_unordered;
  	uint16_t sid;
  	uint8_t last_msg_incomplete;
  	uint8_t state;
  };
  
  /* used to keep track of the addresses yet to try to add/delete */
  TAILQ_HEAD(sctp_asconf_addrhead, sctp_asconf_addr);
  struct sctp_asconf_addr {
  	TAILQ_ENTRY(sctp_asconf_addr) next;
  	struct sctp_asconf_addr_param ap;
  	struct sctp_ifa *ifa;	/* save the ifa for add/del ip */
  	uint8_t sent;		/* has this been sent yet? */
  	uint8_t special_del;	/* not to be used in lookup */
  };
  
  struct sctp_scoping {
  	uint8_t ipv4_addr_legal;
  	uint8_t ipv6_addr_legal;
  #if defined(__Userspace__)
  	uint8_t conn_addr_legal;
  #endif
  	uint8_t loopback_scope;
  	uint8_t ipv4_local_scope;
  	uint8_t local_scope;
  	uint8_t site_scope;
  };
  
  #define SCTP_TSN_LOG_SIZE 40
  
  struct sctp_tsn_log {
  	void     *stcb;
  	uint32_t tsn;
  	uint32_t seq;
  	uint16_t strm;
  	uint16_t sz;
  	uint16_t flgs;
  	uint16_t in_pos;
  	uint16_t in_out;
  	uint16_t resv;
  };
  
  #define SCTP_FS_SPEC_LOG_SIZE 200
  struct sctp_fs_spec_log {
  	uint32_t sent;
  	uint32_t total_flight;
  	uint32_t tsn;
  	uint16_t book;
  	uint8_t incr;
  	uint8_t decr;
  };
  
  /* This struct is here to cut out the compatiabilty
   * pad that bulks up both the inp and stcb. The non
   * pad portion MUST stay in complete sync with
   * sctp_sndrcvinfo... i.e. if sinfo_xxxx is added
   * this must be done here too.
   */
  struct sctp_nonpad_sndrcvinfo {
  	uint16_t sinfo_stream;
  	uint16_t sinfo_ssn;
  	uint16_t sinfo_flags;
  	uint32_t sinfo_ppid;
  	uint32_t sinfo_context;
  	uint32_t sinfo_timetolive;
  	uint32_t sinfo_tsn;
  	uint32_t sinfo_cumtsn;
  	sctp_assoc_t sinfo_assoc_id;
  	uint16_t sinfo_keynumber;
  	uint16_t sinfo_keynumber_valid;
  };
  
  /*
   * JRS - Structure to hold function pointers to the functions responsible
   * for congestion control.
   */
  
  struct sctp_cc_functions {
  	void (*sctp_set_initial_cc_param)(struct sctp_tcb *stcb, struct sctp_nets *net);
  	void (*sctp_cwnd_update_after_sack)(struct sctp_tcb *stcb,
  	                                    struct sctp_association *asoc,
  	                                    int accum_moved ,int reneged_all, int will_exit);
  	void (*sctp_cwnd_update_exit_pf)(struct sctp_tcb *stcb, struct sctp_nets *net);
  	void (*sctp_cwnd_update_after_fr)(struct sctp_tcb *stcb,
  			struct sctp_association *asoc);
  	void (*sctp_cwnd_update_after_timeout)(struct sctp_tcb *stcb,
  			struct sctp_nets *net);
  	void (*sctp_cwnd_update_after_ecn_echo)(struct sctp_tcb *stcb,
  			struct sctp_nets *net, int in_window, int num_pkt_lost);
  	void (*sctp_cwnd_update_after_packet_dropped)(struct sctp_tcb *stcb,
  			struct sctp_nets *net, struct sctp_pktdrop_chunk *cp,
  			uint32_t *bottle_bw, uint32_t *on_queue);
  	void (*sctp_cwnd_update_after_output)(struct sctp_tcb *stcb,
  			struct sctp_nets *net, int burst_limit);
  	void (*sctp_cwnd_update_packet_transmitted)(struct sctp_tcb *stcb,
  			struct sctp_nets *net);
  	void (*sctp_cwnd_update_tsn_acknowledged)(struct sctp_nets *net,
  			struct sctp_tmit_chunk *);
  	void (*sctp_cwnd_new_transmission_begins)(struct sctp_tcb *stcb,
  			struct sctp_nets *net);
  	void (*sctp_cwnd_prepare_net_for_sack)(struct sctp_tcb *stcb,
  			struct sctp_nets *net);
  	int (*sctp_cwnd_socket_option)(struct sctp_tcb *stcb, int set, struct sctp_cc_option *);
  	void (*sctp_rtt_calculated)(struct sctp_tcb *, struct sctp_nets *, struct timeval *);
  };
  
  /*
   * RS - Structure to hold function pointers to the functions responsible
   * for stream scheduling.
   */
  struct sctp_ss_functions {
  	void (*sctp_ss_init)(struct sctp_tcb *stcb, struct sctp_association *asoc,
  		int holds_lock);
  	void (*sctp_ss_clear)(struct sctp_tcb *stcb, struct sctp_association *asoc,
  		int clear_values, int holds_lock);
  	void (*sctp_ss_init_stream)(struct sctp_tcb *stcb, struct sctp_stream_out *strq, struct sctp_stream_out *with_strq);
  	void (*sctp_ss_add_to_stream)(struct sctp_tcb *stcb, struct sctp_association *asoc,
  		struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
  	int (*sctp_ss_is_empty)(struct sctp_tcb *stcb, struct sctp_association *asoc);
  	void (*sctp_ss_remove_from_stream)(struct sctp_tcb *stcb, struct sctp_association *asoc,
  		struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
  	struct sctp_stream_out* (*sctp_ss_select_stream)(struct sctp_tcb *stcb,
  		struct sctp_nets *net, struct sctp_association *asoc);
  	void (*sctp_ss_scheduled)(struct sctp_tcb *stcb, struct sctp_nets *net,
  		struct sctp_association *asoc, struct sctp_stream_out *strq, int moved_how_much);
  	void (*sctp_ss_packet_done)(struct sctp_tcb *stcb, struct sctp_nets *net,
  		struct sctp_association *asoc);
  	int (*sctp_ss_get_value)(struct sctp_tcb *stcb, struct sctp_association *asoc,
  		struct sctp_stream_out *strq, uint16_t *value);
  	int (*sctp_ss_set_value)(struct sctp_tcb *stcb, struct sctp_association *asoc,
  		struct sctp_stream_out *strq, uint16_t value);
  	int (*sctp_ss_is_user_msgs_incomplete)(struct sctp_tcb *stcb, struct sctp_association *asoc);
  };
  
  /* used to save ASCONF chunks for retransmission */
  TAILQ_HEAD(sctp_asconf_head, sctp_asconf);
  struct sctp_asconf {
  	TAILQ_ENTRY(sctp_asconf) next;
  	uint32_t serial_number;
  	uint16_t snd_count;
  	struct mbuf *data;
  	uint16_t len;
  };
  
  /* used to save ASCONF-ACK chunks for retransmission */
  TAILQ_HEAD(sctp_asconf_ackhead, sctp_asconf_ack);
  struct sctp_asconf_ack {
  	TAILQ_ENTRY(sctp_asconf_ack) next;
  	uint32_t serial_number;
  	struct sctp_nets *last_sent_to;
  	struct mbuf *data;
  	uint16_t len;
  };
  
  /*
   * Here we have information about each individual association that we track.
   * We probably in production would be more dynamic. But for ease of
   * implementation we will have a fixed array that we hunt for in a linear
   * fashion.
   */
  struct sctp_association {
  	/* association state */
  	int state;
  
  	/* queue of pending addrs to add/delete */
  	struct sctp_asconf_addrhead asconf_queue;
  
  	struct timeval time_entered;	/* time we entered state */
  	struct timeval time_last_rcvd;
  	struct timeval time_last_sent;
  	struct timeval time_last_sat_advance;
  	struct sctp_nonpad_sndrcvinfo def_send;
  
  	/* timers and such */
  	struct sctp_timer dack_timer;		/* Delayed ack timer */
  	struct sctp_timer asconf_timer;		/* asconf */
  	struct sctp_timer strreset_timer;	/* stream reset */
  	struct sctp_timer shut_guard_timer;	/* shutdown guard */
  	struct sctp_timer autoclose_timer;	/* automatic close timer */
  	struct sctp_timer delayed_event_timer;	/* timer for delayed events */
  	struct sctp_timer delete_prim_timer;	/* deleting primary dst */
  
  	/* list of restricted local addresses */
  	struct sctpladdr sctp_restricted_addrs;
  
  	/* last local address pending deletion (waiting for an address add) */
  	struct sctp_ifa *asconf_addr_del_pending;
  	/* Deleted primary destination (used to stop timer) */
  	struct sctp_nets *deleted_primary;
  
  	struct sctpnetlisthead nets;		/* remote address list */
  
  	/* Free chunk list */
  	struct sctpchunk_listhead free_chunks;
  
  	/* Control chunk queue */
  	struct sctpchunk_listhead control_send_queue;
  
  	/* ASCONF chunk queue */
  	struct sctpchunk_listhead asconf_send_queue;
  
  	/*
  	 * Once a TSN hits the wire it is moved to the sent_queue. We
  	 * maintain two counts here (don't know if any but retran_cnt is
  	 * needed). The idea is that the sent_queue_retran_cnt reflects how
  	 * many chunks have been marked for retranmission by either T3-rxt
  	 * or FR.
  	 */
  	struct sctpchunk_listhead sent_queue;
  	struct sctpchunk_listhead send_queue;
  
  	/* Scheduling queues */
  	struct scheduling_data ss_data;
  
  	/* If an iterator is looking at me, this is it */
  	struct sctp_iterator *stcb_starting_point_for_iterator;
  
  	/* ASCONF save the last ASCONF-ACK so we can resend it if necessary */
  	struct sctp_asconf_ackhead asconf_ack_sent;
  
  	/*
  	 * pointer to last stream reset queued to control queue by us with
  	 * requests.
  	 */
  	struct sctp_tmit_chunk *str_reset;
  	/*
  	 * if Source Address Selection happening, this will rotate through
  	 * the link list.
  	 */
  	struct sctp_laddr *last_used_address;
  
  	/* stream arrays */
  	struct sctp_stream_in *strmin;
  	struct sctp_stream_out *strmout;
  	uint8_t *mapping_array;
  	/* primary destination to use */
  	struct sctp_nets *primary_destination;
  	struct sctp_nets *alternate; /* If primary is down or PF */
  	/* For CMT */
  	struct sctp_nets *last_net_cmt_send_started;
  	/* last place I got a data chunk from */
  	struct sctp_nets *last_data_chunk_from;
  	/* last place I got a control from */
  	struct sctp_nets *last_control_chunk_from;
  
  
  	/*
  	 * wait to the point the cum-ack passes req->send_reset_at_tsn for
  	 * any req on the list.
  	 */
  	struct sctp_resethead resetHead;
  
  	/* queue of chunks waiting to be sent into the local stack */
  	struct sctp_readhead pending_reply_queue;
  
  	/* JRS - the congestion control functions are in this struct */
  	struct sctp_cc_functions cc_functions;
  	/* JRS - value to store the currently loaded congestion control module */
  	uint32_t congestion_control_module;
  	/* RS - the stream scheduling functions are in this struct */
  	struct sctp_ss_functions ss_functions;
  	/* RS - value to store the currently loaded stream scheduling module */
  	uint32_t stream_scheduling_module;
  
  	uint32_t vrf_id;
  	uint32_t cookie_preserve_req;
  	/* ASCONF next seq I am sending out, inits at init-tsn */
  	uint32_t asconf_seq_out;
  	uint32_t asconf_seq_out_acked;
  	/* ASCONF last received ASCONF from peer, starts at peer's TSN-1 */
  	uint32_t asconf_seq_in;
  
  	/* next seq I am sending in str reset messages */
  	uint32_t str_reset_seq_out;
  	/* next seq I am expecting in str reset messages */
  	uint32_t str_reset_seq_in;
  
  	/* various verification tag information */
  	uint32_t my_vtag;	/* The tag to be used. if assoc is re-initited
  				 * by remote end, and I have unlocked this
  				 * will be regenerated to a new random value. */
  	uint32_t peer_vtag;	/* The peers last tag */
  
  	uint32_t my_vtag_nonce;
  	uint32_t peer_vtag_nonce;
  
  	uint32_t assoc_id;
  
  	/* This is the SCTP fragmentation threshold */
  	uint32_t smallest_mtu;
  
  	/*
  	 * Special hook for Fast retransmit, allows us to track the highest
  	 * TSN that is NEW in this SACK if gap ack blocks are present.
  	 */
  	uint32_t this_sack_highest_gap;
  
  	/*
  	 * The highest consecutive TSN that has been acked by peer on my
  	 * sends
  	 */
  	uint32_t last_acked_seq;
  
  	/* The next TSN that I will use in sending. */
  	uint32_t sending_seq;
  
  	/* Original seq number I used ??questionable to keep?? */
  	uint32_t init_seq_number;
  
  
  	/* The Advanced Peer Ack Point, as required by the PR-SCTP */
  	/* (A1 in Section 4.2) */
  	uint32_t advanced_peer_ack_point;
  
  	/*
  	 * The highest consequetive TSN at the bottom of the mapping array
  	 * (for his sends).
  	 */
  	uint32_t cumulative_tsn;
  	/*
  	 * Used to track the mapping array and its offset bits. This MAY be
  	 * lower then cumulative_tsn.
  	 */
  	uint32_t mapping_array_base_tsn;
  	/*
  	 * used to track highest TSN we have received and is listed in the
  	 * mapping array.
  	 */
  	uint32_t highest_tsn_inside_map;
  
  	/* EY - new NR variables used for nr_sack based on mapping_array*/
  	uint8_t *nr_mapping_array;
  	uint32_t highest_tsn_inside_nr_map;
  
  	uint32_t fast_recovery_tsn;
  	uint32_t sat_t3_recovery_tsn;
  	uint32_t tsn_last_delivered;
  	/*
  	 * For the pd-api we should re-write this a bit more efficient. We
  	 * could have multiple sctp_queued_to_read's that we are building at
  	 * once. Now we only do this when we get ready to deliver to the
  	 * socket buffer. Note that we depend on the fact that the struct is
  	 * "stuck" on the read queue until we finish all the pd-api.
  	 */
  	struct sctp_queued_to_read *control_pdapi;
  
  	uint32_t tsn_of_pdapi_last_delivered;
  	uint32_t pdapi_ppid;
  	uint32_t context;
  	uint32_t last_reset_action[SCTP_MAX_RESET_PARAMS];
  	uint32_t last_sending_seq[SCTP_MAX_RESET_PARAMS];
  	uint32_t last_base_tsnsent[SCTP_MAX_RESET_PARAMS];
  #ifdef SCTP_ASOCLOG_OF_TSNS
  	/*
  	 * special log  - This adds considerable size
  	 * to the asoc, but provides a log that you
  	 * can use to detect problems via kgdb.
  	 */
  	struct sctp_tsn_log  in_tsnlog[SCTP_TSN_LOG_SIZE];
  	struct sctp_tsn_log  out_tsnlog[SCTP_TSN_LOG_SIZE];
  	uint32_t cumack_log[SCTP_TSN_LOG_SIZE];
  	uint32_t cumack_logsnt[SCTP_TSN_LOG_SIZE];
  	uint16_t tsn_in_at;
  	uint16_t tsn_out_at;
  	uint16_t tsn_in_wrapped;
  	uint16_t tsn_out_wrapped;
  	uint16_t cumack_log_at;
  	uint16_t cumack_log_atsnt;
  #endif /* SCTP_ASOCLOG_OF_TSNS */
  #ifdef SCTP_FS_SPEC_LOG
  	struct sctp_fs_spec_log fslog[SCTP_FS_SPEC_LOG_SIZE];
  	uint16_t fs_index;
  #endif
  
  	/*
  	 * window state information and smallest MTU that I use to bound
  	 * segmentation
  	 */
  	uint32_t peers_rwnd;
  	uint32_t my_rwnd;
  	uint32_t my_last_reported_rwnd;
  	uint32_t sctp_frag_point;
  
  	uint32_t total_output_queue_size;
  
  	uint32_t sb_cc;		       /* shadow of sb_cc */
  	uint32_t sb_send_resv;     /* amount reserved on a send */
  	uint32_t my_rwnd_control_len; /* shadow of sb_mbcnt used for rwnd control */
  #ifdef INET6
  	uint32_t default_flowlabel;
  #endif
  	uint32_t pr_sctp_cnt;
  	int ctrl_queue_cnt;	/* could be removed  REM - NO IT CAN'T!! RRS */
  	/*
  	 * All outbound datagrams queue into this list from the individual
  	 * stream queue. Here they get assigned a TSN and then await
  	 * sending. The stream seq comes when it is first put in the
  	 * individual str queue
  	 */
  	unsigned int stream_queue_cnt;
  	unsigned int send_queue_cnt;
  	unsigned int sent_queue_cnt;
  	unsigned int sent_queue_cnt_removeable;
  	/*
  	 * Number on sent queue that are marked for retran until this value
  	 * is 0 we only send one packet of retran'ed data.
  	 */
  	unsigned int sent_queue_retran_cnt;
  
  	unsigned int size_on_reasm_queue;
  	unsigned int cnt_on_reasm_queue;
  	unsigned int fwd_tsn_cnt;
  	/* amount of data (bytes) currently in flight (on all destinations) */
  	unsigned int total_flight;
  	/* Total book size in flight */
  	unsigned int total_flight_count;	/* count of chunks used with
  						 * book total */
  	/* count of destinaton nets and list of destination nets */
  	unsigned int numnets;
  
  	/* Total error count on this association */
  	unsigned int overall_error_count;
  
  	unsigned int cnt_msg_on_sb;
  
  	/* All stream count of chunks for delivery */
  	unsigned int size_on_all_streams;
  	unsigned int cnt_on_all_streams;
  
  	/* Heart Beat delay in ms */
  	uint32_t heart_beat_delay;
  
  	/* autoclose */
  	unsigned int sctp_autoclose_ticks;
  
  	/* how many preopen streams we have */
  	unsigned int pre_open_streams;
  
  	/* How many streams I support coming into me */
  	unsigned int max_inbound_streams;
  
  	/* the cookie life I award for any cookie, in seconds */
  	unsigned int cookie_life;
  	/* time to delay acks for */
  	unsigned int delayed_ack;
  	unsigned int old_delayed_ack;
  	unsigned int sack_freq;
  	unsigned int data_pkts_seen;
  
  	unsigned int numduptsns;
  	int dup_tsns[SCTP_MAX_DUP_TSNS];
  	unsigned int initial_init_rto_max;	/* initial RTO for INIT's */
  	unsigned int initial_rto;	/* initial send RTO */
  	unsigned int minrto;	/* per assoc RTO-MIN */
  	unsigned int maxrto;	/* per assoc RTO-MAX */
  
  	/* authentication fields */
  	sctp_auth_chklist_t *local_auth_chunks;
  	sctp_auth_chklist_t *peer_auth_chunks;
  	sctp_hmaclist_t *local_hmacs;	/* local HMACs supported */
  	sctp_hmaclist_t *peer_hmacs;	/* peer HMACs supported */
  	struct sctp_keyhead shared_keys;	/* assoc's shared keys */
  	sctp_authinfo_t authinfo;	/* randoms, cached keys */
  	/*
  	 * refcnt to block freeing when a sender or receiver is off coping
  	 * user data in.
  	 */
  	uint32_t refcnt;
  	uint32_t chunks_on_out_queue;	/* total chunks floating around,
  					 * locked by send socket buffer */
  	uint32_t peers_adaptation;
  	uint32_t default_mtu;
  	uint16_t peer_hmac_id;	/* peer HMAC id to send */
  
  	/*
  	 * Being that we have no bag to collect stale cookies, and that we
  	 * really would not want to anyway.. we will count them in this
  	 * counter. We of course feed them to the pigeons right away (I have
  	 * always thought of pigeons as flying rats).
  	 */
  	uint16_t stale_cookie_count;
  
  	/*
  	 * For the partial delivery API, if up, invoked this is what last
  	 * TSN I delivered
  	 */
  	uint16_t str_of_pdapi;
  	uint16_t ssn_of_pdapi;
  
  	/* counts of actual built streams. Allocation may be more however */
  	/* could re-arrange to optimize space here. */
  	uint16_t streamincnt;
  	uint16_t streamoutcnt;
  	uint16_t strm_realoutsize;
  	uint16_t strm_pending_add_size;
  	/* my maximum number of retrans of INIT and SEND */
  	/* copied from SCTP but should be individually setable */
  	uint16_t max_init_times;
  	uint16_t max_send_times;
  
  	uint16_t def_net_failure;
  
  	uint16_t def_net_pf_threshold;
  
  	/*
  	 * lock flag: 0 is ok to send, 1+ (duals as a retran count) is
  	 * awaiting ACK
  	 */
  	uint16_t mapping_array_size;
  
  	uint16_t last_strm_seq_delivered;
  	uint16_t last_strm_no_delivered;
  
  	uint16_t last_revoke_count;
  	int16_t num_send_timers_up;
  
  	uint16_t stream_locked_on;
  	uint16_t ecn_echo_cnt_onq;
  
  	uint16_t free_chunk_cnt;
  	uint8_t stream_locked;
  	uint8_t authenticated;	/* packet authenticated ok */
  	/*
  	 * This flag indicates that a SACK need to be sent.
  	 * Initially this is 1 to send the first sACK immediately.
  	 */
  	uint8_t send_sack;
  
  	/* max burst of new packets into the network */
  	uint32_t max_burst;
  	/* max burst of fast retransmit packets */
  	uint32_t fr_max_burst;
  
  	uint8_t sat_network;	/* RTT is in range of sat net or greater */
  	uint8_t sat_network_lockout;	/* lockout code */
  	uint8_t burst_limit_applied;	/* Burst limit in effect at last send? */
  	/* flag goes on when we are doing a partial delivery api */
  	uint8_t hb_random_values[4];
  	uint8_t fragmented_delivery_inprogress;
  	uint8_t fragment_flags;
  	uint8_t last_flags_delivered;
  	uint8_t hb_ect_randombit;
  	uint8_t hb_random_idx;
  	uint8_t default_dscp;
  	uint8_t asconf_del_pending;	/* asconf delete last addr pending */
  	uint8_t trigger_reset;
  	/*
  	 * This value, plus all other ack'd but above cum-ack is added
  	 * together to cross check against the bit that we have yet to
  	 * define (probably in the SACK). When the cum-ack is updated, this
  	 * sum is updated as well.
  	 */
  
  	/* Flags whether an extension is supported or not */
  	uint8_t ecn_supported;
  	uint8_t prsctp_supported;
  	uint8_t auth_supported;
  	uint8_t asconf_supported;
  	uint8_t reconfig_supported;
  	uint8_t nrsack_supported;
  	uint8_t pktdrop_supported;
  	uint8_t plpmtud_supported;
  	uint8_t idata_supported;
  
  	/* Did the peer make the stream config (add out) request */
  	uint8_t peer_req_out;
  
  	uint8_t local_strreset_support;
  	uint8_t peer_supports_nat;
  
  	struct sctp_scoping scope;
  	/* flags to handle send alternate net tracking */
  	uint8_t used_alt_asconfack;
  	uint8_t fast_retran_loss_recovery;
  	uint8_t sat_t3_loss_recovery;
  	uint8_t dropped_special_cnt;
  	uint8_t seen_a_sack_this_pkt;
  	uint8_t stream_reset_outstanding;
  	uint8_t stream_reset_out_is_outstanding;
  	uint8_t delayed_connection;
  	uint8_t ifp_had_enobuf;
  	uint8_t saw_sack_with_frags;
  	uint8_t saw_sack_with_nr_frags;
  	uint8_t in_asocid_hash;
  	uint8_t assoc_up_sent;
  	uint8_t adaptation_needed;
  	uint8_t adaptation_sent;
  	/* CMT variables */
  	uint8_t cmt_dac_pkts_rcvd;
  	uint8_t sctp_cmt_on_off;
  	uint8_t iam_blocking;
  	uint8_t cookie_how[8];
  	/* JRS 5/21/07 - CMT PF variable */
  	uint8_t sctp_cmt_pf;
  	uint8_t use_precise_time;
  	uint64_t sctp_features;
  	uint32_t max_cwnd;
  	uint16_t port; /* remote UDP encapsulation port */
  	/*
  	 * The mapping array is used to track out of order sequences above
  	 * last_acked_seq. 0 indicates packet missing 1 indicates packet
  	 * rec'd. We slide it up every time we raise last_acked_seq and 0
  	 * trailing locactions out.  If I get a TSN above the array
  	 * mappingArraySz, I discard the datagram and let retransmit happen.
  	 */
  	uint32_t marked_retrans;
  	uint32_t timoinit;
  	uint32_t timodata;
  	uint32_t timosack;
  	uint32_t timoshutdown;
  	uint32_t timoheartbeat;
  	uint32_t timocookie;
  	uint32_t timoshutdownack;
  	struct timeval start_time;
  	struct timeval discontinuity_time;
  	uint64_t abandoned_unsent[SCTP_PR_SCTP_MAX + 1];
  	uint64_t abandoned_sent[SCTP_PR_SCTP_MAX + 1];
  };
  
  #endif
  