The Tor Browser: netwerk/sctp/src/netinet/sctp_structs.h@ac0c01689b40 (annotated)

netwerk/sctp/src/netinet/sctp_structs.h@ac0c01689b40 (annotated)

netwerk/sctp/src/netinet/sctp_structs.h

Thu, 15 Jan 2015 15:59:08 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:59:08 +0100
branch: TOR_BUG_9701
changeset 10: ac0c01689b40
permissions: -rwxr-xr-x

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /*-
  * 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 255190 2013-09-03 19:31:59Z 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 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;
 	int 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 >= 800000
 	void *ro_lle;
 #endif
 #if __FreeBSD_version >= 900000
 	void *ro_ia;
 	int ro_flags;
 #endif
 #endif
 #if defined(__APPLE__)
 #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;
 #ifdef INVARIANTS
 	uint8_t flowidset;
 #endif
 #endif
 };
 struct sctp_data_chunkrec {
 	uint32_t TSN_seq;	/* the TSN of this transmit */
 	uint16_t stream_seq;	/* the stream sequence number of this transmit */
 	uint16_t stream_number;	/* the stream number of this guy */
 	uint32_t payloadtype;
 	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 */
 	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 {
 	uint16_t id;
 	uint16_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;
 };
 /*
  * The first part of this structure MUST be the entire sinfo structure. Maybe
  * I should have made it a sub structure... we can circle back later and do
  * that if we want.
  */
 struct sctp_queued_to_read {	/* sinfo structure Pluse more */
 	uint16_t sinfo_stream;	/* off the wire */
 	uint16_t sinfo_ssn;	/* 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 length;	/* length of data */
 	uint32_t held_length;	/* length held in sb */
 	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;
 	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  some_taken;
 };
 /* 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 length;
 	uint32_t timetolive;
 	uint32_t ppid;
 	uint32_t context;
 	uint16_t sinfo_flags;
 	uint16_t stream;
 	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;
 	uint16_t stream_no;
 	uint16_t last_sequence_delivered;	/* used for re-order */
 	uint8_t  delivery_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.
  */
 union scheduling_data {
 	struct sctpwheel_listhead out_wheel;
 	struct sctplist_listhead out_list;
 };
 /*
  * 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;
 };
 /* 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;
 	uint16_t stream_no;
 	uint16_t next_sequence_send;	/* next one I expect to send out */
 	uint8_t last_msg_incomplete;
 };
 /* 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;
 	uint16_t strm;
 	uint16_t seq;
 	uint16_t sz;
 	uint16_t flgs;
 	uint16_t in_pos;
 	uint16_t in_out;
 };
 #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_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);
 };
 /* 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;
 	/* re-assembly queue for fragmented chunks on the inbound path */
 	struct sctpchunk_listhead reasmqueue;
 	/* Scheduling queues */
 	union scheduling_data ss_data;
 	/* This pointer will be set to NULL
 	 * most of the time. But when we have
 	 * a fragmented message, where we could
 	 * not get out all of the message at
 	 * the last send then this will point
 	 * to the stream to go get data from.
 	 */
 	struct sctp_stream_out *locked_on_sending;
 	/* 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;
 	/* circular looking for output selection */
 	struct sctp_stream_out *last_out_stream;
 	/*
 	 * 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 efficent. 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;
 	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 */
 	/*
 	 * 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.
 	 */
 	/* Flag to tell if ECN is allowed */
 	uint8_t ecn_allowed;
 	/* Did the peer make the stream config (add out) request */
 	uint8_t peer_req_out;
 	/* flag to indicate if peer can do asconf */
 	uint8_t peer_supports_asconf;
 	/* EY - flag to indicate if peer can do nr_sack*/
 	uint8_t peer_supports_nr_sack;
 	/* pr-sctp support flag */
 	uint8_t peer_supports_prsctp;
 	/* peer authentication support flag */
 	uint8_t peer_supports_auth;
 	/* stream resets are supported by the peer */
 	uint8_t peer_supports_strreset;
 	uint8_t local_strreset_support;
         uint8_t peer_supports_nat;
 	/*
 	 * packet drop's are supported by the peer, we don't really care
 	 * about this but we bookkeep it anyway.
 	 */
 	uint8_t peer_supports_pktdrop;
 	struct sctp_scoping scope;
 	/* flags to handle send alternate net tracking */
 	uint8_t used_alt_onsack;
 	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];
 	/* EY 05/05/08 - NR_SACK variable*/
 	uint8_t sctp_nr_sack_on_off;
 	/* JRS 5/21/07 - CMT PF variable */
 	uint8_t sctp_cmt_pf;
 	uint8_t use_precise_time;
 	uint64_t sctp_features;
 	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;
 };
 #endif

The Tor Browser / annotate

netwerk/sctp/src/netinet/sctp_structs.h@ac0c01689b40 (annotated)

netwerk/sctp/src/netinet/sctp_structs.h