xref: /freebsd/sys/netinet/sctp_structs.h (revision 85732ac8)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions are met:
10  *
11  * a) Redistributions of source code must retain the above copyright notice,
12  *    this list of conditions and the following disclaimer.
13  *
14  * b) Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in
16  *    the documentation and/or other materials provided with the distribution.
17  *
18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
19  *    contributors may be used to endorse or promote products derived
20  *    from this software without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
32  * THE POSSIBILITY OF SUCH DAMAGE.
33  */
34 
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37 
38 #ifndef _NETINET_SCTP_STRUCTS_H_
39 #define _NETINET_SCTP_STRUCTS_H_
40 
41 #include <netinet/sctp_os.h>
42 #include <netinet/sctp_header.h>
43 #include <netinet/sctp_auth.h>
44 
45 struct sctp_timer {
46 	sctp_os_timer_t timer;
47 
48 	int type;
49 	/*
50 	 * Depending on the timer type these will be setup and cast with the
51 	 * appropriate entity.
52 	 */
53 	void *ep;
54 	void *tcb;
55 	void *net;
56 	void *vnet;
57 
58 	/* for sanity checking */
59 	void *self;
60 	uint32_t ticks;
61 	uint32_t stopped_from;
62 };
63 
64 
65 struct sctp_foo_stuff {
66 	struct sctp_inpcb *inp;
67 	uint32_t lineno;
68 	uint32_t ticks;
69 	int updown;
70 };
71 
72 
73 /*
74  * This is the information we track on each interface that we know about from
75  * the distant end.
76  */
77 TAILQ_HEAD(sctpnetlisthead, sctp_nets);
78 
79 struct sctp_stream_reset_list {
80 	TAILQ_ENTRY(sctp_stream_reset_list) next_resp;
81 	uint32_t seq;
82 	uint32_t tsn;
83 	uint32_t number_entries;
84 	uint16_t list_of_streams[];
85 };
86 
87 TAILQ_HEAD(sctp_resethead, sctp_stream_reset_list);
88 
89 /*
90  * Users of the iterator need to malloc a iterator with a call to
91  * sctp_initiate_iterator(inp_func, assoc_func, inp_func,  pcb_flags, pcb_features,
92  *     asoc_state, void-ptr-arg, uint32-arg, end_func, inp);
93  *
94  * Use the following two defines if you don't care what pcb flags are on the EP
95  * and/or you don't care what state the association is in.
96  *
97  * Note that if you specify an INP as the last argument then ONLY each
98  * association of that single INP will be executed upon. Note that the pcb
99  * flags STILL apply so if the inp you specify has different pcb_flags then
100  * what you put in pcb_flags nothing will happen. use SCTP_PCB_ANY_FLAGS to
101  * assure the inp you specify gets treated.
102  */
103 #define SCTP_PCB_ANY_FLAGS	0x00000000
104 #define SCTP_PCB_ANY_FEATURES	0x00000000
105 #define SCTP_ASOC_ANY_STATE	0x00000000
106 
107 typedef void (*asoc_func) (struct sctp_inpcb *, struct sctp_tcb *, void *ptr,
108     uint32_t val);
109 typedef int (*inp_func) (struct sctp_inpcb *, void *ptr, uint32_t val);
110 typedef void (*end_func) (void *ptr, uint32_t val);
111 
112 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
113 /* whats on the mcore control struct */
114 struct sctp_mcore_queue {
115 	TAILQ_ENTRY(sctp_mcore_queue) next;
116 	struct vnet *vn;
117 	struct mbuf *m;
118 	int off;
119 	int v6;
120 };
121 
122 TAILQ_HEAD(sctp_mcore_qhead, sctp_mcore_queue);
123 
124 struct sctp_mcore_ctrl {
125 	SCTP_PROCESS_STRUCT thread_proc;
126 	struct sctp_mcore_qhead que;
127 	struct mtx core_mtx;
128 	struct mtx que_mtx;
129 	int running;
130 	int cpuid;
131 };
132 
133 
134 #endif
135 
136 
137 struct sctp_iterator {
138 	TAILQ_ENTRY(sctp_iterator) sctp_nxt_itr;
139 	struct vnet *vn;
140 	struct sctp_timer tmr;
141 	struct sctp_inpcb *inp;	/* current endpoint */
142 	struct sctp_tcb *stcb;	/* current* assoc */
143 	struct sctp_inpcb *next_inp;	/* special hook to skip to */
144 	asoc_func function_assoc;	/* per assoc function */
145 	inp_func function_inp;	/* per endpoint function */
146 	inp_func function_inp_end;	/* end INP function */
147 	end_func function_atend;	/* iterator completion function */
148 	void *pointer;		/* pointer for apply func to use */
149 	uint32_t val;		/* value for apply func to use */
150 	uint32_t pcb_flags;	/* endpoint flags being checked */
151 	uint32_t pcb_features;	/* endpoint features being checked */
152 	uint32_t asoc_state;	/* assoc state being checked */
153 	uint32_t iterator_flags;
154 	uint8_t no_chunk_output;
155 	uint8_t done_current_ep;
156 };
157 
158 /* iterator_flags values */
159 #define SCTP_ITERATOR_DO_ALL_INP	0x00000001
160 #define SCTP_ITERATOR_DO_SINGLE_INP	0x00000002
161 
162 
163 TAILQ_HEAD(sctpiterators, sctp_iterator);
164 
165 struct sctp_copy_all {
166 	struct sctp_inpcb *inp;	/* ep */
167 	struct mbuf *m;
168 	struct sctp_sndrcvinfo sndrcv;
169 	int sndlen;
170 	int cnt_sent;
171 	int cnt_failed;
172 };
173 
174 struct sctp_asconf_iterator {
175 	struct sctpladdr list_of_work;
176 	int cnt;
177 };
178 
179 struct iterator_control {
180 	struct mtx ipi_iterator_wq_mtx;
181 	struct mtx it_mtx;
182 	SCTP_PROCESS_STRUCT thread_proc;
183 	struct sctpiterators iteratorhead;
184 	struct sctp_iterator *cur_it;
185 	uint32_t iterator_running;
186 	uint32_t iterator_flags;
187 };
188 #define SCTP_ITERATOR_STOP_CUR_IT	0x00000004
189 #define SCTP_ITERATOR_STOP_CUR_INP	0x00000008
190 
191 struct sctp_net_route {
192 	sctp_rtentry_t *ro_rt;
193 	struct llentry *ro_lle;
194 	char *ro_prepend;
195 	uint16_t ro_plen;
196 	uint16_t ro_flags;
197 	uint16_t ro_mtu;
198 	uint16_t spare;
199 	union sctp_sockstore _l_addr;	/* remote peer addr */
200 	struct sctp_ifa *_s_addr;	/* our selected src addr */
201 };
202 
203 struct htcp {
204 	uint16_t alpha;		/* Fixed point arith, << 7 */
205 	uint8_t beta;		/* Fixed point arith, << 7 */
206 	uint8_t modeswitch;	/* Delay modeswitch until we had at least one
207 				 * congestion event */
208 	uint32_t last_cong;	/* Time since last congestion event end */
209 	uint32_t undo_last_cong;
210 	uint16_t bytes_acked;
211 	uint32_t bytecount;
212 	uint32_t minRTT;
213 	uint32_t maxRTT;
214 
215 	uint32_t undo_maxRTT;
216 	uint32_t undo_old_maxB;
217 
218 	/* Bandwidth estimation */
219 	uint32_t minB;
220 	uint32_t maxB;
221 	uint32_t old_maxB;
222 	uint32_t Bi;
223 	uint32_t lasttime;
224 };
225 
226 struct rtcc_cc {
227 	struct timeval tls;	/* The time we started the sending  */
228 	uint64_t lbw;		/* Our last estimated bw */
229 	uint64_t lbw_rtt;	/* RTT at bw estimate */
230 	uint64_t bw_bytes;	/* The total bytes since this sending began */
231 	uint64_t bw_tot_time;	/* The total time since sending began */
232 	uint64_t new_tot_time;	/* temp holding the new value */
233 	uint64_t bw_bytes_at_last_rttc;	/* What bw_bytes was at last rtt calc */
234 	uint32_t cwnd_at_bw_set;	/* Cwnd at last bw saved - lbw */
235 	uint32_t vol_reduce;	/* cnt of voluntary reductions */
236 	uint16_t steady_step;	/* The number required to be in steady state */
237 	uint16_t step_cnt;	/* The current number */
238 	uint8_t ret_from_eq;	/* When all things are equal what do I return
239 				 * 0/1 - 1 no cc advance */
240 	uint8_t use_dccc_ecn;	/* Flag to enable DCCC ECN */
241 	uint8_t tls_needs_set;	/* Flag to indicate we need to set tls 0 or 1
242 				 * means set at send 2 not */
243 	uint8_t last_step_state;	/* Last state if steady state stepdown
244 					 * is on */
245 	uint8_t rtt_set_this_sack;	/* Flag saying this sack had RTT calc
246 					 * on it */
247 	uint8_t last_inst_ind;	/* Last saved inst indication */
248 };
249 
250 
251 struct sctp_nets {
252 	TAILQ_ENTRY(sctp_nets) sctp_next;	/* next link */
253 
254 	/*
255 	 * Things on the top half may be able to be split into a common
256 	 * structure shared by all.
257 	 */
258 	struct sctp_timer pmtu_timer;
259 	struct sctp_timer hb_timer;
260 
261 	/*
262 	 * The following two in combination equate to a route entry for v6
263 	 * or v4.
264 	 */
265 	struct sctp_net_route ro;
266 
267 	/* mtu discovered so far */
268 	uint32_t mtu;
269 	uint32_t ssthresh;	/* not sure about this one for split */
270 	uint32_t last_cwr_tsn;
271 	uint32_t cwr_window_tsn;
272 	uint32_t ecn_ce_pkt_cnt;
273 	uint32_t lost_cnt;
274 	/* smoothed average things for RTT and RTO itself */
275 	int lastsa;
276 	int lastsv;
277 	uint64_t rtt;		/* last measured rtt value in us */
278 	unsigned int RTO;
279 
280 	/* This is used for SHUTDOWN/SHUTDOWN-ACK/SEND or INIT timers */
281 	struct sctp_timer rxt_timer;
282 
283 	/* last time in seconds I sent to it */
284 	struct timeval last_sent_time;
285 	union cc_control_data {
286 		struct htcp htcp_ca;	/* JRS - struct used in HTCP algorithm */
287 		struct rtcc_cc rtcc;	/* rtcc module cc stuff  */
288 	}               cc_mod;
289 	int ref_count;
290 
291 	/* Congestion stats per destination */
292 	/*
293 	 * flight size variables and such, sorry Vern, I could not avoid
294 	 * this if I wanted performance :>
295 	 */
296 	uint32_t flight_size;
297 	uint32_t cwnd;		/* actual cwnd */
298 	uint32_t prev_cwnd;	/* cwnd before any processing */
299 	uint32_t ecn_prev_cwnd;	/* ECN prev cwnd at first ecn_echo seen in new
300 				 * window */
301 	uint32_t partial_bytes_acked;	/* in CA tracks when to incr a MTU */
302 	/* tracking variables to avoid the aloc/free in sack processing */
303 	unsigned int net_ack;
304 	unsigned int net_ack2;
305 
306 	/*
307 	 * JRS - 5/8/07 - Variable to track last time a destination was
308 	 * active for CMT PF
309 	 */
310 	uint32_t last_active;
311 
312 	/*
313 	 * CMT variables (iyengar@cis.udel.edu)
314 	 */
315 	uint32_t this_sack_highest_newack;	/* tracks highest TSN newly
316 						 * acked for a given dest in
317 						 * the current SACK. Used in
318 						 * SFR and HTNA algos */
319 	uint32_t pseudo_cumack;	/* CMT CUC algorithm. Maintains next expected
320 				 * pseudo-cumack for this destination */
321 	uint32_t rtx_pseudo_cumack;	/* CMT CUC algorithm. Maintains next
322 					 * expected pseudo-cumack for this
323 					 * destination */
324 
325 	/* CMT fast recovery variables */
326 	uint32_t fast_recovery_tsn;
327 	uint32_t heartbeat_random1;
328 	uint32_t heartbeat_random2;
329 #ifdef INET6
330 	uint32_t flowlabel;
331 #endif
332 	uint8_t dscp;
333 
334 	struct timeval start_time;	/* time when this net was created */
335 	uint32_t marked_retrans;	/* number or DATA chunks marked for
336 					 * timer based retransmissions */
337 	uint32_t marked_fastretrans;
338 	uint32_t heart_beat_delay;	/* Heart Beat delay in ms */
339 
340 	/* if this guy is ok or not ... status */
341 	uint16_t dest_state;
342 	/* number of timeouts to consider the destination unreachable */
343 	uint16_t failure_threshold;
344 	/* number of timeouts to consider the destination potentially failed */
345 	uint16_t pf_threshold;
346 	/* error stats on the destination */
347 	uint16_t error_count;
348 	/* UDP port number in case of UDP tunneling */
349 	uint16_t port;
350 
351 	uint8_t fast_retran_loss_recovery;
352 	uint8_t will_exit_fast_recovery;
353 	/* Flags that probably can be combined into dest_state */
354 	uint8_t fast_retran_ip;	/* fast retransmit in progress */
355 	uint8_t hb_responded;
356 	uint8_t saw_newack;	/* CMT's SFR algorithm flag */
357 	uint8_t src_addr_selected;	/* if we split we move */
358 	uint8_t indx_of_eligible_next_to_use;
359 	uint8_t addr_is_local;	/* its a local address (if known) could move
360 				 * in split */
361 
362 	/*
363 	 * CMT variables (iyengar@cis.udel.edu)
364 	 */
365 	uint8_t find_pseudo_cumack;	/* CMT CUC algorithm. Flag used to
366 					 * find a new pseudocumack. This flag
367 					 * is set after a new pseudo-cumack
368 					 * has been received and indicates
369 					 * that the sender should find the
370 					 * next pseudo-cumack expected for
371 					 * this destination */
372 	uint8_t find_rtx_pseudo_cumack;	/* CMT CUCv2 algorithm. Flag used to
373 					 * find a new rtx-pseudocumack. This
374 					 * flag is set after a new
375 					 * rtx-pseudo-cumack has been received
376 					 * and indicates that the sender
377 					 * should find the next
378 					 * rtx-pseudo-cumack expected for this
379 					 * destination */
380 	uint8_t new_pseudo_cumack;	/* CMT CUC algorithm. Flag used to
381 					 * indicate if a new pseudo-cumack or
382 					 * rtx-pseudo-cumack has been received */
383 	uint8_t window_probe;	/* Doing a window probe? */
384 	uint8_t RTO_measured;	/* Have we done the first measure */
385 	uint8_t last_hs_used;	/* index into the last HS table entry we used */
386 	uint8_t lan_type;
387 	uint8_t rto_needed;
388 	uint32_t flowid;
389 	uint8_t flowtype;
390 };
391 
392 
393 struct sctp_data_chunkrec {
394 	uint32_t tsn;		/* the TSN of this transmit */
395 	uint32_t mid;		/* the message identifier of this transmit */
396 	uint16_t sid;		/* the stream number of this guy */
397 	uint32_t ppid;
398 	uint32_t context;	/* from send */
399 	uint32_t cwnd_at_send;
400 	/*
401 	 * part of the Highest sacked algorithm to be able to stroke counts
402 	 * on ones that are FR'd.
403 	 */
404 	uint32_t fast_retran_tsn;	/* sending_seq at the time of FR */
405 	struct timeval timetodrop;	/* time we drop it from queue */
406 	uint32_t fsn;		/* Fragment Sequence Number */
407 	uint8_t doing_fast_retransmit;
408 	uint8_t rcv_flags;	/* flags pulled from data chunk on inbound for
409 				 * outbound holds sending flags for PR-SCTP. */
410 	uint8_t state_flags;
411 	uint8_t chunk_was_revoked;
412 	uint8_t fwd_tsn_cnt;
413 };
414 
415 TAILQ_HEAD(sctpchunk_listhead, sctp_tmit_chunk);
416 
417 /* The lower byte is used to enumerate PR_SCTP policies */
418 #define CHUNK_FLAGS_PR_SCTP_TTL	        SCTP_PR_SCTP_TTL
419 #define CHUNK_FLAGS_PR_SCTP_BUF	        SCTP_PR_SCTP_BUF
420 #define CHUNK_FLAGS_PR_SCTP_RTX         SCTP_PR_SCTP_RTX
421 
422 /* The upper byte is used as a bit mask */
423 #define CHUNK_FLAGS_FRAGMENT_OK	        0x0100
424 
425 struct chk_id {
426 	uint8_t id;
427 	uint8_t can_take_data;
428 };
429 
430 
431 struct sctp_tmit_chunk {
432 	union {
433 		struct sctp_data_chunkrec data;
434 		struct chk_id chunk_id;
435 	}     rec;
436 	struct sctp_association *asoc;	/* bp to asoc this belongs to */
437 	struct timeval sent_rcv_time;	/* filled in if RTT being calculated */
438 	struct mbuf *data;	/* pointer to mbuf chain of data */
439 	struct mbuf *last_mbuf;	/* pointer to last mbuf in chain */
440 	struct sctp_nets *whoTo;
441 	          TAILQ_ENTRY(sctp_tmit_chunk) sctp_next;	/* next link */
442 	int32_t sent;		/* the send status */
443 	uint16_t snd_count;	/* number of times I sent */
444 	uint16_t flags;		/* flags, such as FRAGMENT_OK */
445 	uint16_t send_size;
446 	uint16_t book_size;
447 	uint16_t mbcnt;
448 	uint16_t auth_keyid;
449 	uint8_t holds_key_ref;	/* flag if auth keyid refcount is held */
450 	uint8_t pad_inplace;
451 	uint8_t do_rtt;
452 	uint8_t book_size_scale;
453 	uint8_t no_fr_allowed;
454 	uint8_t copy_by_ref;
455 	uint8_t window_probe;
456 };
457 
458 struct sctp_queued_to_read {	/* sinfo structure Pluse more */
459 	uint16_t sinfo_stream;	/* off the wire */
460 	uint16_t sinfo_flags;	/* SCTP_UNORDERED from wire use SCTP_EOF for
461 				 * EOR */
462 	uint32_t sinfo_ppid;	/* off the wire */
463 	uint32_t sinfo_context;	/* pick this up from assoc def context? */
464 	uint32_t sinfo_timetolive;	/* not used by kernel */
465 	uint32_t sinfo_tsn;	/* Use this in reassembly as first TSN */
466 	uint32_t sinfo_cumtsn;	/* Use this in reassembly as last TSN */
467 	sctp_assoc_t sinfo_assoc_id;	/* our assoc id */
468 	/* Non sinfo stuff */
469 	uint32_t mid;		/* Fragment Index */
470 	uint32_t length;	/* length of data */
471 	uint32_t held_length;	/* length held in sb */
472 	uint32_t top_fsn;	/* Highest FSN in queue */
473 	uint32_t fsn_included;	/* Highest FSN in *data portion */
474 	struct sctp_nets *whoFrom;	/* where it came from */
475 	struct mbuf *data;	/* front of the mbuf chain of data with
476 				 * PKT_HDR */
477 	struct mbuf *tail_mbuf;	/* used for multi-part data */
478 	struct mbuf *aux_data;	/* used to hold/cache  control if o/s does not
479 				 * take it from us */
480 	struct sctp_tcb *stcb;	/* assoc, used for window update */
481 	         TAILQ_ENTRY(sctp_queued_to_read) next;
482 	         TAILQ_ENTRY(sctp_queued_to_read) next_instrm;
483 	struct sctpchunk_listhead reasm;
484 	uint16_t port_from;
485 	uint16_t spec_flags;	/* Flags to hold the notification field */
486 	uint8_t do_not_ref_stcb;
487 	uint8_t end_added;
488 	uint8_t pdapi_aborted;
489 	uint8_t pdapi_started;
490 	uint8_t some_taken;
491 	uint8_t last_frag_seen;
492 	uint8_t first_frag_seen;
493 	uint8_t on_read_q;
494 	uint8_t on_strm_q;
495 };
496 
497 #define SCTP_ON_ORDERED 1
498 #define SCTP_ON_UNORDERED 2
499 
500 /* This data structure will be on the outbound
501  * stream queues. Data will be pulled off from
502  * the front of the mbuf data and chunk-ified
503  * by the output routines. We will custom
504  * fit every chunk we pull to the send/sent
505  * queue to make up the next full packet
506  * if we can. An entry cannot be removed
507  * from the stream_out queue until
508  * the msg_is_complete flag is set. This
509  * means at times data/tail_mbuf MIGHT
510  * be NULL.. If that occurs it happens
511  * for one of two reasons. Either the user
512  * is blocked on a send() call and has not
513  * awoken to copy more data down... OR
514  * the user is in the explict MSG_EOR mode
515  * and wrote some data, but has not completed
516  * sending.
517  */
518 struct sctp_stream_queue_pending {
519 	struct mbuf *data;
520 	struct mbuf *tail_mbuf;
521 	struct timeval ts;
522 	struct sctp_nets *net;
523 	          TAILQ_ENTRY(sctp_stream_queue_pending) next;
524 	          TAILQ_ENTRY(sctp_stream_queue_pending) ss_next;
525 	uint32_t fsn;
526 	uint32_t length;
527 	uint32_t timetolive;
528 	uint32_t ppid;
529 	uint32_t context;
530 	uint16_t sinfo_flags;
531 	uint16_t sid;
532 	uint16_t act_flags;
533 	uint16_t auth_keyid;
534 	uint8_t holds_key_ref;
535 	uint8_t msg_is_complete;
536 	uint8_t some_taken;
537 	uint8_t sender_all_done;
538 	uint8_t put_last_out;
539 	uint8_t discard_rest;
540 };
541 
542 /*
543  * this struct contains info that is used to track inbound stream data and
544  * help with ordering.
545  */
546 TAILQ_HEAD(sctpwheelunrel_listhead, sctp_stream_in);
547 struct sctp_stream_in {
548 	struct sctp_readhead inqueue;
549 	struct sctp_readhead uno_inqueue;
550 	uint32_t last_mid_delivered;	/* used for re-order */
551 	uint16_t sid;
552 	uint8_t delivery_started;
553 	uint8_t pd_api_started;
554 };
555 
556 TAILQ_HEAD(sctpwheel_listhead, sctp_stream_out);
557 TAILQ_HEAD(sctplist_listhead, sctp_stream_queue_pending);
558 
559 
560 /* Round-robin schedulers */
561 struct ss_rr {
562 	/* next link in wheel */
563 	TAILQ_ENTRY(sctp_stream_out) next_spoke;
564 };
565 
566 /* Priority scheduler */
567 struct ss_prio {
568 	/* next link in wheel */
569 	TAILQ_ENTRY(sctp_stream_out) next_spoke;
570 	/* priority id */
571 	uint16_t priority;
572 };
573 
574 /* Fair Bandwidth scheduler */
575 struct ss_fb {
576 	/* next link in wheel */
577 	TAILQ_ENTRY(sctp_stream_out) next_spoke;
578 	/* stores message size */
579 	int32_t rounds;
580 };
581 
582 /*
583  * This union holds all data necessary for
584  * different stream schedulers.
585  */
586 struct scheduling_data {
587 	struct sctp_stream_out *locked_on_sending;
588 	/* circular looking for output selection */
589 	struct sctp_stream_out *last_out_stream;
590 	union {
591 		struct sctpwheel_listhead wheel;
592 		struct sctplist_listhead list;
593 	}     out;
594 };
595 
596 /*
597  * This union holds all parameters per stream
598  * necessary for different stream schedulers.
599  */
600 union scheduling_parameters {
601 	struct ss_rr rr;
602 	struct ss_prio prio;
603 	struct ss_fb fb;
604 };
605 
606 /* States for outgoing streams */
607 #define SCTP_STREAM_CLOSED           0x00
608 #define SCTP_STREAM_OPENING          0x01
609 #define SCTP_STREAM_OPEN             0x02
610 #define SCTP_STREAM_RESET_PENDING    0x03
611 #define SCTP_STREAM_RESET_IN_FLIGHT  0x04
612 
613 #define SCTP_MAX_STREAMS_AT_ONCE_RESET 200
614 
615 /* This struct is used to track the traffic on outbound streams */
616 struct sctp_stream_out {
617 	struct sctp_streamhead outqueue;
618 	union scheduling_parameters ss_params;
619 	uint32_t chunks_on_queues;	/* send queue and sent queue */
620 #if defined(SCTP_DETAILED_STR_STATS)
621 	uint32_t abandoned_unsent[SCTP_PR_SCTP_MAX + 1];
622 	uint32_t abandoned_sent[SCTP_PR_SCTP_MAX + 1];
623 #else
624 	/* Only the aggregation */
625 	uint32_t abandoned_unsent[1];
626 	uint32_t abandoned_sent[1];
627 #endif
628 	/*
629 	 * For associations using DATA chunks, the lower 16-bit of
630 	 * next_mid_ordered are used as the next SSN.
631 	 */
632 	uint32_t next_mid_ordered;
633 	uint32_t next_mid_unordered;
634 	uint16_t sid;
635 	uint8_t last_msg_incomplete;
636 	uint8_t state;
637 };
638 
639 /* used to keep track of the addresses yet to try to add/delete */
640 TAILQ_HEAD(sctp_asconf_addrhead, sctp_asconf_addr);
641 struct sctp_asconf_addr {
642 	TAILQ_ENTRY(sctp_asconf_addr) next;
643 	struct sctp_asconf_addr_param ap;
644 	struct sctp_ifa *ifa;	/* save the ifa for add/del ip */
645 	uint8_t sent;		/* has this been sent yet? */
646 	uint8_t special_del;	/* not to be used in lookup */
647 };
648 
649 struct sctp_scoping {
650 	uint8_t ipv4_addr_legal;
651 	uint8_t ipv6_addr_legal;
652 	uint8_t loopback_scope;
653 	uint8_t ipv4_local_scope;
654 	uint8_t local_scope;
655 	uint8_t site_scope;
656 };
657 
658 #define SCTP_TSN_LOG_SIZE 40
659 
660 struct sctp_tsn_log {
661 	void *stcb;
662 	uint32_t tsn;
663 	uint32_t seq;
664 	uint16_t strm;
665 	uint16_t sz;
666 	uint16_t flgs;
667 	uint16_t in_pos;
668 	uint16_t in_out;
669 	uint16_t resv;
670 };
671 
672 #define SCTP_FS_SPEC_LOG_SIZE 200
673 struct sctp_fs_spec_log {
674 	uint32_t sent;
675 	uint32_t total_flight;
676 	uint32_t tsn;
677 	uint16_t book;
678 	uint8_t incr;
679 	uint8_t decr;
680 };
681 
682 /* This struct is here to cut out the compatiabilty
683  * pad that bulks up both the inp and stcb. The non
684  * pad portion MUST stay in complete sync with
685  * sctp_sndrcvinfo... i.e. if sinfo_xxxx is added
686  * this must be done here too.
687  */
688 struct sctp_nonpad_sndrcvinfo {
689 	uint16_t sinfo_stream;
690 	uint16_t sinfo_ssn;
691 	uint16_t sinfo_flags;
692 	uint32_t sinfo_ppid;
693 	uint32_t sinfo_context;
694 	uint32_t sinfo_timetolive;
695 	uint32_t sinfo_tsn;
696 	uint32_t sinfo_cumtsn;
697 	sctp_assoc_t sinfo_assoc_id;
698 	uint16_t sinfo_keynumber;
699 	uint16_t sinfo_keynumber_valid;
700 };
701 
702 /*
703  * JRS - Structure to hold function pointers to the functions responsible
704  * for congestion control.
705  */
706 
707 struct sctp_cc_functions {
708 	void (*sctp_set_initial_cc_param) (struct sctp_tcb *stcb, struct sctp_nets *net);
709 	void (*sctp_cwnd_update_after_sack) (struct sctp_tcb *stcb,
710 	    struct sctp_association *asoc,
711 	    int accum_moved, int reneged_all, int will_exit);
712 	void (*sctp_cwnd_update_exit_pf) (struct sctp_tcb *stcb, struct sctp_nets *net);
713 	void (*sctp_cwnd_update_after_fr) (struct sctp_tcb *stcb,
714 	    struct sctp_association *asoc);
715 	void (*sctp_cwnd_update_after_timeout) (struct sctp_tcb *stcb,
716 	    struct sctp_nets *net);
717 	void (*sctp_cwnd_update_after_ecn_echo) (struct sctp_tcb *stcb,
718 	    struct sctp_nets *net, int in_window, int num_pkt_lost);
719 	void (*sctp_cwnd_update_after_packet_dropped) (struct sctp_tcb *stcb,
720 	    struct sctp_nets *net, struct sctp_pktdrop_chunk *cp,
721 	    uint32_t *bottle_bw, uint32_t *on_queue);
722 	void (*sctp_cwnd_update_after_output) (struct sctp_tcb *stcb,
723 	    struct sctp_nets *net, int burst_limit);
724 	void (*sctp_cwnd_update_packet_transmitted) (struct sctp_tcb *stcb,
725 	    struct sctp_nets *net);
726 	void (*sctp_cwnd_update_tsn_acknowledged) (struct sctp_nets *net,
727 	    struct sctp_tmit_chunk *);
728 	void (*sctp_cwnd_new_transmission_begins) (struct sctp_tcb *stcb,
729 	    struct sctp_nets *net);
730 	void (*sctp_cwnd_prepare_net_for_sack) (struct sctp_tcb *stcb,
731 	    struct sctp_nets *net);
732 	int (*sctp_cwnd_socket_option) (struct sctp_tcb *stcb, int set, struct sctp_cc_option *);
733 	void (*sctp_rtt_calculated) (struct sctp_tcb *, struct sctp_nets *, struct timeval *);
734 };
735 
736 /*
737  * RS - Structure to hold function pointers to the functions responsible
738  * for stream scheduling.
739  */
740 struct sctp_ss_functions {
741 	void (*sctp_ss_init) (struct sctp_tcb *stcb, struct sctp_association *asoc,
742 	    int holds_lock);
743 	void (*sctp_ss_clear) (struct sctp_tcb *stcb, struct sctp_association *asoc,
744 	    int clear_values, int holds_lock);
745 	void (*sctp_ss_init_stream) (struct sctp_tcb *stcb, struct sctp_stream_out *strq, struct sctp_stream_out *with_strq);
746 	void (*sctp_ss_add_to_stream) (struct sctp_tcb *stcb, struct sctp_association *asoc,
747 	    struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
748 	int (*sctp_ss_is_empty) (struct sctp_tcb *stcb, struct sctp_association *asoc);
749 	void (*sctp_ss_remove_from_stream) (struct sctp_tcb *stcb, struct sctp_association *asoc,
750 	    struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
751 struct sctp_stream_out *(*sctp_ss_select_stream) (struct sctp_tcb *stcb,
752 	    struct sctp_nets *net, struct sctp_association *asoc);
753 	void (*sctp_ss_scheduled) (struct sctp_tcb *stcb, struct sctp_nets *net,
754 	    struct sctp_association *asoc, struct sctp_stream_out *strq, int moved_how_much);
755 	void (*sctp_ss_packet_done) (struct sctp_tcb *stcb, struct sctp_nets *net,
756 	    struct sctp_association *asoc);
757 	int (*sctp_ss_get_value) (struct sctp_tcb *stcb, struct sctp_association *asoc,
758 	    struct sctp_stream_out *strq, uint16_t *value);
759 	int (*sctp_ss_set_value) (struct sctp_tcb *stcb, struct sctp_association *asoc,
760 	    struct sctp_stream_out *strq, uint16_t value);
761 	int (*sctp_ss_is_user_msgs_incomplete) (struct sctp_tcb *stcb, struct sctp_association *asoc);
762 };
763 
764 /* used to save ASCONF chunks for retransmission */
765 TAILQ_HEAD(sctp_asconf_head, sctp_asconf);
766 struct sctp_asconf {
767 	TAILQ_ENTRY(sctp_asconf) next;
768 	uint32_t serial_number;
769 	uint16_t snd_count;
770 	struct mbuf *data;
771 	uint16_t len;
772 };
773 
774 /* used to save ASCONF-ACK chunks for retransmission */
775 TAILQ_HEAD(sctp_asconf_ackhead, sctp_asconf_ack);
776 struct sctp_asconf_ack {
777 	TAILQ_ENTRY(sctp_asconf_ack) next;
778 	uint32_t serial_number;
779 	struct sctp_nets *last_sent_to;
780 	struct mbuf *data;
781 	uint16_t len;
782 };
783 
784 /*
785  * Here we have information about each individual association that we track.
786  * We probably in production would be more dynamic. But for ease of
787  * implementation we will have a fixed array that we hunt for in a linear
788  * fashion.
789  */
790 struct sctp_association {
791 	/* association state */
792 	int state;
793 
794 	/* queue of pending addrs to add/delete */
795 	struct sctp_asconf_addrhead asconf_queue;
796 
797 	struct timeval time_entered;	/* time we entered state */
798 	struct timeval time_last_rcvd;
799 	struct timeval time_last_sent;
800 	struct timeval time_last_sat_advance;
801 	struct sctp_nonpad_sndrcvinfo def_send;
802 
803 	/* timers and such */
804 	struct sctp_timer dack_timer;	/* Delayed ack timer */
805 	struct sctp_timer asconf_timer;	/* asconf */
806 	struct sctp_timer strreset_timer;	/* stream reset */
807 	struct sctp_timer shut_guard_timer;	/* shutdown guard */
808 	struct sctp_timer autoclose_timer;	/* automatic close timer */
809 	struct sctp_timer delayed_event_timer;	/* timer for delayed events */
810 	struct sctp_timer delete_prim_timer;	/* deleting primary dst */
811 
812 	/* list of restricted local addresses */
813 	struct sctpladdr sctp_restricted_addrs;
814 
815 	/* last local address pending deletion (waiting for an address add) */
816 	struct sctp_ifa *asconf_addr_del_pending;
817 	/* Deleted primary destination (used to stop timer) */
818 	struct sctp_nets *deleted_primary;
819 
820 	struct sctpnetlisthead nets;	/* remote address list */
821 
822 	/* Free chunk list */
823 	struct sctpchunk_listhead free_chunks;
824 
825 	/* Control chunk queue */
826 	struct sctpchunk_listhead control_send_queue;
827 
828 	/* ASCONF chunk queue */
829 	struct sctpchunk_listhead asconf_send_queue;
830 
831 	/*
832 	 * Once a TSN hits the wire it is moved to the sent_queue. We
833 	 * maintain two counts here (don't know if any but retran_cnt is
834 	 * needed). The idea is that the sent_queue_retran_cnt reflects how
835 	 * many chunks have been marked for retranmission by either T3-rxt
836 	 * or FR.
837 	 */
838 	struct sctpchunk_listhead sent_queue;
839 	struct sctpchunk_listhead send_queue;
840 
841 	/* Scheduling queues */
842 	struct scheduling_data ss_data;
843 
844 	/* If an iterator is looking at me, this is it */
845 	struct sctp_iterator *stcb_starting_point_for_iterator;
846 
847 	/* ASCONF save the last ASCONF-ACK so we can resend it if necessary */
848 	struct sctp_asconf_ackhead asconf_ack_sent;
849 
850 	/*
851 	 * pointer to last stream reset queued to control queue by us with
852 	 * requests.
853 	 */
854 	struct sctp_tmit_chunk *str_reset;
855 	/*
856 	 * if Source Address Selection happening, this will rotate through
857 	 * the link list.
858 	 */
859 	struct sctp_laddr *last_used_address;
860 
861 	/* stream arrays */
862 	struct sctp_stream_in *strmin;
863 	struct sctp_stream_out *strmout;
864 	uint8_t *mapping_array;
865 	/* primary destination to use */
866 	struct sctp_nets *primary_destination;
867 	struct sctp_nets *alternate;	/* If primary is down or PF */
868 	/* For CMT */
869 	struct sctp_nets *last_net_cmt_send_started;
870 	/* last place I got a data chunk from */
871 	struct sctp_nets *last_data_chunk_from;
872 	/* last place I got a control from */
873 	struct sctp_nets *last_control_chunk_from;
874 
875 
876 	/*
877 	 * wait to the point the cum-ack passes req->send_reset_at_tsn for
878 	 * any req on the list.
879 	 */
880 	struct sctp_resethead resetHead;
881 
882 	/* queue of chunks waiting to be sent into the local stack */
883 	struct sctp_readhead pending_reply_queue;
884 
885 	/* JRS - the congestion control functions are in this struct */
886 	struct sctp_cc_functions cc_functions;
887 	/*
888 	 * JRS - value to store the currently loaded congestion control
889 	 * module
890 	 */
891 	uint32_t congestion_control_module;
892 	/* RS - the stream scheduling functions are in this struct */
893 	struct sctp_ss_functions ss_functions;
894 	/* RS - value to store the currently loaded stream scheduling module */
895 	uint32_t stream_scheduling_module;
896 
897 	uint32_t vrf_id;
898 	uint32_t cookie_preserve_req;
899 	/* ASCONF next seq I am sending out, inits at init-tsn */
900 	uint32_t asconf_seq_out;
901 	uint32_t asconf_seq_out_acked;
902 	/* ASCONF last received ASCONF from peer, starts at peer's TSN-1 */
903 	uint32_t asconf_seq_in;
904 
905 	/* next seq I am sending in str reset messages */
906 	uint32_t str_reset_seq_out;
907 	/* next seq I am expecting in str reset messages */
908 	uint32_t str_reset_seq_in;
909 
910 	/* various verification tag information */
911 	uint32_t my_vtag;	/* The tag to be used. if assoc is re-initited
912 				 * by remote end, and I have unlocked this
913 				 * will be regenerated to a new random value. */
914 	uint32_t peer_vtag;	/* The peers last tag */
915 
916 	uint32_t my_vtag_nonce;
917 	uint32_t peer_vtag_nonce;
918 
919 	uint32_t assoc_id;
920 
921 	/* This is the SCTP fragmentation threshold */
922 	uint32_t smallest_mtu;
923 
924 	/*
925 	 * Special hook for Fast retransmit, allows us to track the highest
926 	 * TSN that is NEW in this SACK if gap ack blocks are present.
927 	 */
928 	uint32_t this_sack_highest_gap;
929 
930 	/*
931 	 * The highest consecutive TSN that has been acked by peer on my
932 	 * sends
933 	 */
934 	uint32_t last_acked_seq;
935 
936 	/* The next TSN that I will use in sending. */
937 	uint32_t sending_seq;
938 
939 	/* Original seq number I used ??questionable to keep?? */
940 	uint32_t init_seq_number;
941 
942 
943 	/* The Advanced Peer Ack Point, as required by the PR-SCTP */
944 	/* (A1 in Section 4.2) */
945 	uint32_t advanced_peer_ack_point;
946 
947 	/*
948 	 * The highest consequetive TSN at the bottom of the mapping array
949 	 * (for his sends).
950 	 */
951 	uint32_t cumulative_tsn;
952 	/*
953 	 * Used to track the mapping array and its offset bits. This MAY be
954 	 * lower then cumulative_tsn.
955 	 */
956 	uint32_t mapping_array_base_tsn;
957 	/*
958 	 * used to track highest TSN we have received and is listed in the
959 	 * mapping array.
960 	 */
961 	uint32_t highest_tsn_inside_map;
962 
963 	/* EY - new NR variables used for nr_sack based on mapping_array */
964 	uint8_t *nr_mapping_array;
965 	uint32_t highest_tsn_inside_nr_map;
966 
967 	uint32_t fast_recovery_tsn;
968 	uint32_t sat_t3_recovery_tsn;
969 	uint32_t tsn_last_delivered;
970 	/*
971 	 * For the pd-api we should re-write this a bit more efficient. We
972 	 * could have multiple sctp_queued_to_read's that we are building at
973 	 * once. Now we only do this when we get ready to deliver to the
974 	 * socket buffer. Note that we depend on the fact that the struct is
975 	 * "stuck" on the read queue until we finish all the pd-api.
976 	 */
977 	struct sctp_queued_to_read *control_pdapi;
978 
979 	uint32_t tsn_of_pdapi_last_delivered;
980 	uint32_t pdapi_ppid;
981 	uint32_t context;
982 	uint32_t last_reset_action[SCTP_MAX_RESET_PARAMS];
983 	uint32_t last_sending_seq[SCTP_MAX_RESET_PARAMS];
984 	uint32_t last_base_tsnsent[SCTP_MAX_RESET_PARAMS];
985 #ifdef SCTP_ASOCLOG_OF_TSNS
986 	/*
987 	 * special log  - This adds considerable size to the asoc, but
988 	 * provides a log that you can use to detect problems via kgdb.
989 	 */
990 	struct sctp_tsn_log in_tsnlog[SCTP_TSN_LOG_SIZE];
991 	struct sctp_tsn_log out_tsnlog[SCTP_TSN_LOG_SIZE];
992 	uint32_t cumack_log[SCTP_TSN_LOG_SIZE];
993 	uint32_t cumack_logsnt[SCTP_TSN_LOG_SIZE];
994 	uint16_t tsn_in_at;
995 	uint16_t tsn_out_at;
996 	uint16_t tsn_in_wrapped;
997 	uint16_t tsn_out_wrapped;
998 	uint16_t cumack_log_at;
999 	uint16_t cumack_log_atsnt;
1000 #endif				/* SCTP_ASOCLOG_OF_TSNS */
1001 #ifdef SCTP_FS_SPEC_LOG
1002 	struct sctp_fs_spec_log fslog[SCTP_FS_SPEC_LOG_SIZE];
1003 	uint16_t fs_index;
1004 #endif
1005 
1006 	/*
1007 	 * window state information and smallest MTU that I use to bound
1008 	 * segmentation
1009 	 */
1010 	uint32_t peers_rwnd;
1011 	uint32_t my_rwnd;
1012 	uint32_t my_last_reported_rwnd;
1013 	uint32_t sctp_frag_point;
1014 
1015 	uint32_t total_output_queue_size;
1016 
1017 	uint32_t sb_cc;		/* shadow of sb_cc */
1018 	uint32_t sb_send_resv;	/* amount reserved on a send */
1019 	uint32_t my_rwnd_control_len;	/* shadow of sb_mbcnt used for rwnd
1020 					 * control */
1021 #ifdef INET6
1022 	uint32_t default_flowlabel;
1023 #endif
1024 	uint32_t pr_sctp_cnt;
1025 	int ctrl_queue_cnt;	/* could be removed  REM - NO IT CAN'T!! RRS */
1026 	/*
1027 	 * All outbound datagrams queue into this list from the individual
1028 	 * stream queue. Here they get assigned a TSN and then await
1029 	 * sending. The stream seq comes when it is first put in the
1030 	 * individual str queue
1031 	 */
1032 	unsigned int stream_queue_cnt;
1033 	unsigned int send_queue_cnt;
1034 	unsigned int sent_queue_cnt;
1035 	unsigned int sent_queue_cnt_removeable;
1036 	/*
1037 	 * Number on sent queue that are marked for retran until this value
1038 	 * is 0 we only send one packet of retran'ed data.
1039 	 */
1040 	unsigned int sent_queue_retran_cnt;
1041 
1042 	unsigned int size_on_reasm_queue;
1043 	unsigned int cnt_on_reasm_queue;
1044 	unsigned int fwd_tsn_cnt;
1045 	/* amount of data (bytes) currently in flight (on all destinations) */
1046 	unsigned int total_flight;
1047 	/* Total book size in flight */
1048 	unsigned int total_flight_count;	/* count of chunks used with
1049 						 * book total */
1050 	/* count of destinaton nets and list of destination nets */
1051 	unsigned int numnets;
1052 
1053 	/* Total error count on this association */
1054 	unsigned int overall_error_count;
1055 
1056 	unsigned int cnt_msg_on_sb;
1057 
1058 	/* All stream count of chunks for delivery */
1059 	unsigned int size_on_all_streams;
1060 	unsigned int cnt_on_all_streams;
1061 
1062 	/* Heart Beat delay in ms */
1063 	uint32_t heart_beat_delay;
1064 
1065 	/* autoclose */
1066 	unsigned int sctp_autoclose_ticks;
1067 
1068 	/* how many preopen streams we have */
1069 	unsigned int pre_open_streams;
1070 
1071 	/* How many streams I support coming into me */
1072 	unsigned int max_inbound_streams;
1073 
1074 	/* the cookie life I award for any cookie, in seconds */
1075 	unsigned int cookie_life;
1076 	/* time to delay acks for */
1077 	unsigned int delayed_ack;
1078 	unsigned int old_delayed_ack;
1079 	unsigned int sack_freq;
1080 	unsigned int data_pkts_seen;
1081 
1082 	unsigned int numduptsns;
1083 	int dup_tsns[SCTP_MAX_DUP_TSNS];
1084 	unsigned int initial_init_rto_max;	/* initial RTO for INIT's */
1085 	unsigned int initial_rto;	/* initial send RTO */
1086 	unsigned int minrto;	/* per assoc RTO-MIN */
1087 	unsigned int maxrto;	/* per assoc RTO-MAX */
1088 
1089 	/* authentication fields */
1090 	sctp_auth_chklist_t *local_auth_chunks;
1091 	sctp_auth_chklist_t *peer_auth_chunks;
1092 	sctp_hmaclist_t *local_hmacs;	/* local HMACs supported */
1093 	sctp_hmaclist_t *peer_hmacs;	/* peer HMACs supported */
1094 	struct sctp_keyhead shared_keys;	/* assoc's shared keys */
1095 	sctp_authinfo_t authinfo;	/* randoms, cached keys */
1096 	/*
1097 	 * refcnt to block freeing when a sender or receiver is off coping
1098 	 * user data in.
1099 	 */
1100 	uint32_t refcnt;
1101 	uint32_t chunks_on_out_queue;	/* total chunks floating around,
1102 					 * locked by send socket buffer */
1103 	uint32_t peers_adaptation;
1104 	uint32_t default_mtu;
1105 	uint16_t peer_hmac_id;	/* peer HMAC id to send */
1106 
1107 	/*
1108 	 * Being that we have no bag to collect stale cookies, and that we
1109 	 * really would not want to anyway.. we will count them in this
1110 	 * counter. We of course feed them to the pigeons right away (I have
1111 	 * always thought of pigeons as flying rats).
1112 	 */
1113 	uint16_t stale_cookie_count;
1114 
1115 	/*
1116 	 * For the partial delivery API, if up, invoked this is what last
1117 	 * TSN I delivered
1118 	 */
1119 	uint16_t str_of_pdapi;
1120 	uint16_t ssn_of_pdapi;
1121 
1122 	/* counts of actual built streams. Allocation may be more however */
1123 	/* could re-arrange to optimize space here. */
1124 	uint16_t streamincnt;
1125 	uint16_t streamoutcnt;
1126 	uint16_t strm_realoutsize;
1127 	uint16_t strm_pending_add_size;
1128 	/* my maximum number of retrans of INIT and SEND */
1129 	/* copied from SCTP but should be individually setable */
1130 	uint16_t max_init_times;
1131 	uint16_t max_send_times;
1132 
1133 	uint16_t def_net_failure;
1134 
1135 	uint16_t def_net_pf_threshold;
1136 
1137 	/*
1138 	 * lock flag: 0 is ok to send, 1+ (duals as a retran count) is
1139 	 * awaiting ACK
1140 	 */
1141 	uint16_t mapping_array_size;
1142 
1143 	uint16_t last_strm_seq_delivered;
1144 	uint16_t last_strm_no_delivered;
1145 
1146 	uint16_t last_revoke_count;
1147 	int16_t num_send_timers_up;
1148 
1149 	uint16_t stream_locked_on;
1150 	uint16_t ecn_echo_cnt_onq;
1151 
1152 	uint16_t free_chunk_cnt;
1153 	uint8_t stream_locked;
1154 	uint8_t authenticated;	/* packet authenticated ok */
1155 	/*
1156 	 * This flag indicates that a SACK need to be sent. Initially this
1157 	 * is 1 to send the first sACK immediately.
1158 	 */
1159 	uint8_t send_sack;
1160 
1161 	/* max burst of new packets into the network */
1162 	uint32_t max_burst;
1163 	/* max burst of fast retransmit packets */
1164 	uint32_t fr_max_burst;
1165 
1166 	uint8_t sat_network;	/* RTT is in range of sat net or greater */
1167 	uint8_t sat_network_lockout;	/* lockout code */
1168 	uint8_t burst_limit_applied;	/* Burst limit in effect at last send? */
1169 	/* flag goes on when we are doing a partial delivery api */
1170 	uint8_t hb_random_values[4];
1171 	uint8_t fragmented_delivery_inprogress;
1172 	uint8_t fragment_flags;
1173 	uint8_t last_flags_delivered;
1174 	uint8_t hb_ect_randombit;
1175 	uint8_t hb_random_idx;
1176 	uint8_t default_dscp;
1177 	uint8_t asconf_del_pending;	/* asconf delete last addr pending */
1178 	uint8_t trigger_reset;
1179 	/*
1180 	 * This value, plus all other ack'd but above cum-ack is added
1181 	 * together to cross check against the bit that we have yet to
1182 	 * define (probably in the SACK). When the cum-ack is updated, this
1183 	 * sum is updated as well.
1184 	 */
1185 
1186 	/* Flags whether an extension is supported or not */
1187 	uint8_t ecn_supported;
1188 	uint8_t prsctp_supported;
1189 	uint8_t auth_supported;
1190 	uint8_t asconf_supported;
1191 	uint8_t reconfig_supported;
1192 	uint8_t nrsack_supported;
1193 	uint8_t pktdrop_supported;
1194 	uint8_t idata_supported;
1195 
1196 	/* Did the peer make the stream config (add out) request */
1197 	uint8_t peer_req_out;
1198 
1199 	uint8_t local_strreset_support;
1200 	uint8_t peer_supports_nat;
1201 
1202 	struct sctp_scoping scope;
1203 	/* flags to handle send alternate net tracking */
1204 	uint8_t used_alt_asconfack;
1205 	uint8_t fast_retran_loss_recovery;
1206 	uint8_t sat_t3_loss_recovery;
1207 	uint8_t dropped_special_cnt;
1208 	uint8_t seen_a_sack_this_pkt;
1209 	uint8_t stream_reset_outstanding;
1210 	uint8_t stream_reset_out_is_outstanding;
1211 	uint8_t delayed_connection;
1212 	uint8_t ifp_had_enobuf;
1213 	uint8_t saw_sack_with_frags;
1214 	uint8_t saw_sack_with_nr_frags;
1215 	uint8_t in_asocid_hash;
1216 	uint8_t assoc_up_sent;
1217 	uint8_t adaptation_needed;
1218 	uint8_t adaptation_sent;
1219 	/* CMT variables */
1220 	uint8_t cmt_dac_pkts_rcvd;
1221 	uint8_t sctp_cmt_on_off;
1222 	uint8_t iam_blocking;
1223 	uint8_t cookie_how[8];
1224 	/* JRS 5/21/07 - CMT PF variable */
1225 	uint8_t sctp_cmt_pf;
1226 	uint8_t use_precise_time;
1227 	uint64_t sctp_features;
1228 	uint32_t max_cwnd;
1229 	uint16_t port;		/* remote UDP encapsulation port */
1230 	/*
1231 	 * The mapping array is used to track out of order sequences above
1232 	 * last_acked_seq. 0 indicates packet missing 1 indicates packet
1233 	 * rec'd. We slide it up every time we raise last_acked_seq and 0
1234 	 * trailing locactions out.  If I get a TSN above the array
1235 	 * mappingArraySz, I discard the datagram and let retransmit happen.
1236 	 */
1237 	uint32_t marked_retrans;
1238 	uint32_t timoinit;
1239 	uint32_t timodata;
1240 	uint32_t timosack;
1241 	uint32_t timoshutdown;
1242 	uint32_t timoheartbeat;
1243 	uint32_t timocookie;
1244 	uint32_t timoshutdownack;
1245 	struct timeval start_time;
1246 	struct timeval discontinuity_time;
1247 	uint64_t abandoned_unsent[SCTP_PR_SCTP_MAX + 1];
1248 	uint64_t abandoned_sent[SCTP_PR_SCTP_MAX + 1];
1249 };
1250 
1251 #endif
1252