xref: /freebsd/sys/netinet/sctp_structs.h (revision ec273ebf3b6aed5fba8c56b6ece5ad8693a48ea7)
1 /*-
2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are met:
8  *
9  * a) Redistributions of source code must retain the above copyright notice,
10  *    this list of conditions and the following disclaimer.
11  *
12  * b) Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in
14  *    the documentation and/or other materials provided with the distribution.
15  *
16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
17  *    contributors may be used to endorse or promote products derived
18  *    from this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30  * THE POSSIBILITY OF SUCH DAMAGE.
31  */
32 
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35 
36 #ifndef _NETINET_SCTP_STRUCTS_H_
37 #define _NETINET_SCTP_STRUCTS_H_
38 
39 #include <netinet/sctp_os.h>
40 #include <netinet/sctp_header.h>
41 #include <netinet/sctp_auth.h>
42 
43 struct sctp_timer {
44 	sctp_os_timer_t timer;
45 
46 	int type;
47 	/*
48 	 * Depending on the timer type these will be setup and cast with the
49 	 * appropriate entity.
50 	 */
51 	void *ep;
52 	void *tcb;
53 	void *net;
54 	void *vnet;
55 
56 	/* for sanity checking */
57 	void *self;
58 	uint32_t ticks;
59 	uint32_t stopped_from;
60 };
61 
62 
63 struct sctp_foo_stuff {
64 	struct sctp_inpcb *inp;
65 	uint32_t lineno;
66 	uint32_t ticks;
67 	int updown;
68 };
69 
70 
71 /*
72  * This is the information we track on each interface that we know about from
73  * the distant end.
74  */
75 TAILQ_HEAD(sctpnetlisthead, sctp_nets);
76 
77 struct sctp_stream_reset_list {
78 	TAILQ_ENTRY(sctp_stream_reset_list) next_resp;
79 	uint32_t tsn;
80 	uint32_t number_entries;
81 	uint16_t list_of_streams[];
82 };
83 
84 TAILQ_HEAD(sctp_resethead, sctp_stream_reset_list);
85 
86 /*
87  * Users of the iterator need to malloc a iterator with a call to
88  * sctp_initiate_iterator(inp_func, assoc_func, inp_func,  pcb_flags, pcb_features,
89  *     asoc_state, void-ptr-arg, uint32-arg, end_func, inp);
90  *
91  * Use the following two defines if you don't care what pcb flags are on the EP
92  * and/or you don't care what state the association is in.
93  *
94  * Note that if you specify an INP as the last argument then ONLY each
95  * association of that single INP will be executed upon. Note that the pcb
96  * flags STILL apply so if the inp you specify has different pcb_flags then
97  * what you put in pcb_flags nothing will happen. use SCTP_PCB_ANY_FLAGS to
98  * assure the inp you specify gets treated.
99  */
100 #define SCTP_PCB_ANY_FLAGS	0x00000000
101 #define SCTP_PCB_ANY_FEATURES	0x00000000
102 #define SCTP_ASOC_ANY_STATE	0x00000000
103 
104 typedef void (*asoc_func) (struct sctp_inpcb *, struct sctp_tcb *, void *ptr,
105          uint32_t val);
106 typedef int (*inp_func) (struct sctp_inpcb *, void *ptr, uint32_t val);
107 typedef void (*end_func) (void *ptr, uint32_t val);
108 
109 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
110 /* whats on the mcore control struct */
111 struct sctp_mcore_queue {
112 	TAILQ_ENTRY(sctp_mcore_queue) next;
113 	struct vnet *vn;
114 	struct mbuf *m;
115 	int off;
116 	int v6;
117 };
118 
119 TAILQ_HEAD(sctp_mcore_qhead, sctp_mcore_queue);
120 
121 struct sctp_mcore_ctrl {
122 	SCTP_PROCESS_STRUCT thread_proc;
123 	struct sctp_mcore_qhead que;
124 	struct mtx core_mtx;
125 	struct mtx que_mtx;
126 	int running;
127 	int cpuid;
128 };
129 
130 
131 #endif
132 
133 
134 struct sctp_iterator {
135 	TAILQ_ENTRY(sctp_iterator) sctp_nxt_itr;
136 	struct vnet *vn;
137 	struct sctp_timer tmr;
138 	struct sctp_inpcb *inp;	/* current endpoint */
139 	struct sctp_tcb *stcb;	/* current* assoc */
140 	struct sctp_inpcb *next_inp;	/* special hook to skip to */
141 	asoc_func function_assoc;	/* per assoc function */
142 	inp_func function_inp;	/* per endpoint function */
143 	inp_func function_inp_end;	/* end INP function */
144 	end_func function_atend;/* iterator completion function */
145 	void *pointer;		/* pointer for apply func to use */
146 	uint32_t val;		/* value for apply func to use */
147 	uint32_t pcb_flags;	/* endpoint flags being checked */
148 	uint32_t pcb_features;	/* endpoint features being checked */
149 	uint32_t asoc_state;	/* assoc state being checked */
150 	uint32_t iterator_flags;
151 	uint8_t no_chunk_output;
152 	uint8_t done_current_ep;
153 };
154 
155 /* iterator_flags values */
156 #define SCTP_ITERATOR_DO_ALL_INP	0x00000001
157 #define SCTP_ITERATOR_DO_SINGLE_INP	0x00000002
158 
159 
160 TAILQ_HEAD(sctpiterators, sctp_iterator);
161 
162 struct sctp_copy_all {
163 	struct sctp_inpcb *inp;	/* ep */
164 	struct mbuf *m;
165 	struct sctp_sndrcvinfo sndrcv;
166 	int sndlen;
167 	int cnt_sent;
168 	int cnt_failed;
169 };
170 
171 struct sctp_asconf_iterator {
172 	struct sctpladdr list_of_work;
173 	int cnt;
174 };
175 
176 struct iterator_control {
177 	struct mtx ipi_iterator_wq_mtx;
178 	struct mtx it_mtx;
179 	SCTP_PROCESS_STRUCT thread_proc;
180 	struct sctpiterators iteratorhead;
181 	struct sctp_iterator *cur_it;
182 	uint32_t iterator_running;
183 	uint32_t iterator_flags;
184 };
185 
186 #define SCTP_ITERATOR_STOP_CUR_IT	0x00000004
187 #define SCTP_ITERATOR_STOP_CUR_INP	0x00000008
188 
189 struct sctp_net_route {
190 	sctp_rtentry_t *ro_rt;
191 	void *ro_lle;
192 	void *ro_ia;
193 	int ro_flags;
194 	union sctp_sockstore _l_addr;	/* remote peer addr */
195 	struct sctp_ifa *_s_addr;	/* our selected src addr */
196 };
197 
198 struct htcp {
199 	uint16_t alpha;		/* Fixed point arith, << 7 */
200 	uint8_t beta;		/* Fixed point arith, << 7 */
201 	uint8_t modeswitch;	/* Delay modeswitch until we had at least one
202 				 * congestion event */
203 	uint32_t last_cong;	/* Time since last congestion event end */
204 	uint32_t undo_last_cong;
205 	uint16_t bytes_acked;
206 	uint32_t bytecount;
207 	uint32_t minRTT;
208 	uint32_t maxRTT;
209 
210 	uint32_t undo_maxRTT;
211 	uint32_t undo_old_maxB;
212 
213 	/* Bandwidth estimation */
214 	uint32_t minB;
215 	uint32_t maxB;
216 	uint32_t old_maxB;
217 	uint32_t Bi;
218 	uint32_t lasttime;
219 };
220 
221 struct rtcc_cc {
222 	struct timeval tls;	/* The time we started the sending  */
223 	uint64_t lbw;		/* Our last estimated bw */
224 	uint64_t lbw_rtt;	/* RTT at bw estimate */
225 	uint64_t bw_bytes;	/* The total bytes since this sending began */
226 	uint64_t bw_tot_time;	/* The total time since sending began */
227 	uint64_t new_tot_time;	/* temp holding the new value */
228 	uint64_t bw_bytes_at_last_rttc;	/* What bw_bytes was at last rtt calc */
229 	uint32_t cwnd_at_bw_set;/* Cwnd at last bw saved - lbw */
230 	uint32_t vol_reduce;	/* cnt of voluntary reductions */
231 	uint16_t steady_step;	/* The number required to be in steady state */
232 	uint16_t step_cnt;	/* The current number */
233 	uint8_t ret_from_eq;	/* When all things are equal what do I return
234 				 * 0/1 - 1 no cc advance */
235 	uint8_t use_dccc_ecn;	/* Flag to enable DCCC ECN */
236 	uint8_t tls_needs_set;	/* Flag to indicate we need to set tls 0 or 1
237 				 * means set at send 2 not */
238 	uint8_t last_step_state;/* Last state if steady state stepdown is on */
239 	uint8_t rtt_set_this_sack;	/* Flag saying this sack had RTT calc
240 					 * on it */
241 	uint8_t last_inst_ind;	/* Last saved inst indication */
242 };
243 
244 
245 struct sctp_nets {
246 	TAILQ_ENTRY(sctp_nets) sctp_next;	/* next link */
247 
248 	/*
249 	 * Things on the top half may be able to be split into a common
250 	 * structure shared by all.
251 	 */
252 	struct sctp_timer pmtu_timer;
253 	struct sctp_timer hb_timer;
254 
255 	/*
256 	 * The following two in combination equate to a route entry for v6
257 	 * or v4.
258 	 */
259 	struct sctp_net_route ro;
260 
261 	/* mtu discovered so far */
262 	uint32_t mtu;
263 	uint32_t ssthresh;	/* not sure about this one for split */
264 	uint32_t last_cwr_tsn;
265 	uint32_t cwr_window_tsn;
266 	uint32_t ecn_ce_pkt_cnt;
267 	uint32_t lost_cnt;
268 	/* smoothed average things for RTT and RTO itself */
269 	int lastsa;
270 	int lastsv;
271 	uint64_t rtt;		/* last measured rtt value in us */
272 	unsigned int RTO;
273 
274 	/* This is used for SHUTDOWN/SHUTDOWN-ACK/SEND or INIT timers */
275 	struct sctp_timer rxt_timer;
276 
277 	/* last time in seconds I sent to it */
278 	struct timeval last_sent_time;
279 	union cc_control_data {
280 		struct htcp htcp_ca;	/* JRS - struct used in HTCP algorithm */
281 		struct rtcc_cc rtcc;	/* rtcc module cc stuff  */
282 	}               cc_mod;
283 	int ref_count;
284 
285 	/* Congestion stats per destination */
286 	/*
287 	 * flight size variables and such, sorry Vern, I could not avoid
288 	 * this if I wanted performance :>
289 	 */
290 	uint32_t flight_size;
291 	uint32_t cwnd;		/* actual cwnd */
292 	uint32_t prev_cwnd;	/* cwnd before any processing */
293 	uint32_t ecn_prev_cwnd;	/* ECN prev cwnd at first ecn_echo seen in new
294 				 * window */
295 	uint32_t partial_bytes_acked;	/* in CA tracks when to incr a MTU */
296 	/* tracking variables to avoid the aloc/free in sack processing */
297 	unsigned int net_ack;
298 	unsigned int net_ack2;
299 
300 	/*
301 	 * JRS - 5/8/07 - Variable to track last time a destination was
302 	 * active for CMT PF
303 	 */
304 	uint32_t last_active;
305 
306 	/*
307 	 * CMT variables (iyengar@cis.udel.edu)
308 	 */
309 	uint32_t this_sack_highest_newack;	/* tracks highest TSN newly
310 						 * acked for a given dest in
311 						 * the current SACK. Used in
312 						 * SFR and HTNA algos */
313 	uint32_t pseudo_cumack;	/* CMT CUC algorithm. Maintains next expected
314 				 * pseudo-cumack for this destination */
315 	uint32_t rtx_pseudo_cumack;	/* CMT CUC algorithm. Maintains next
316 					 * expected pseudo-cumack for this
317 					 * destination */
318 
319 	/* CMT fast recovery variables */
320 	uint32_t fast_recovery_tsn;
321 	uint32_t heartbeat_random1;
322 	uint32_t heartbeat_random2;
323 #ifdef INET6
324 	uint32_t flowlabel;
325 #endif
326 	uint8_t dscp;
327 
328 	struct timeval start_time;	/* time when this net was created */
329 	uint32_t marked_retrans;/* number or DATA chunks marked for timer
330 				 * based retransmissions */
331 	uint32_t marked_fastretrans;
332 	uint32_t heart_beat_delay;	/* Heart Beat delay in ms */
333 
334 	/* if this guy is ok or not ... status */
335 	uint16_t dest_state;
336 	/* number of timeouts to consider the destination unreachable */
337 	uint16_t failure_threshold;
338 	/* number of timeouts to consider the destination potentially failed */
339 	uint16_t pf_threshold;
340 	/* error stats on the destination */
341 	uint16_t error_count;
342 	/* UDP port number in case of UDP tunneling */
343 	uint16_t port;
344 
345 	uint8_t fast_retran_loss_recovery;
346 	uint8_t will_exit_fast_recovery;
347 	/* Flags that probably can be combined into dest_state */
348 	uint8_t fast_retran_ip;	/* fast retransmit in progress */
349 	uint8_t hb_responded;
350 	uint8_t saw_newack;	/* CMT's SFR algorithm flag */
351 	uint8_t src_addr_selected;	/* if we split we move */
352 	uint8_t indx_of_eligible_next_to_use;
353 	uint8_t addr_is_local;	/* its a local address (if known) could move
354 				 * in split */
355 
356 	/*
357 	 * CMT variables (iyengar@cis.udel.edu)
358 	 */
359 	uint8_t find_pseudo_cumack;	/* CMT CUC algorithm. Flag used to
360 					 * find a new pseudocumack. This flag
361 					 * is set after a new pseudo-cumack
362 					 * has been received and indicates
363 					 * that the sender should find the
364 					 * next pseudo-cumack expected for
365 					 * this destination */
366 	uint8_t find_rtx_pseudo_cumack;	/* CMT CUCv2 algorithm. Flag used to
367 					 * find a new rtx-pseudocumack. This
368 					 * flag is set after a new
369 					 * rtx-pseudo-cumack has been received
370 					 * and indicates that the sender
371 					 * should find the next
372 					 * rtx-pseudo-cumack expected for this
373 					 * destination */
374 	uint8_t new_pseudo_cumack;	/* CMT CUC algorithm. Flag used to
375 					 * indicate if a new pseudo-cumack or
376 					 * rtx-pseudo-cumack has been received */
377 	uint8_t window_probe;	/* Doing a window probe? */
378 	uint8_t RTO_measured;	/* Have we done the first measure */
379 	uint8_t last_hs_used;	/* index into the last HS table entry we used */
380 	uint8_t lan_type;
381 	uint8_t rto_needed;
382 	uint32_t flowid;
383 	uint8_t flowtype;
384 };
385 
386 
387 struct sctp_data_chunkrec {
388 	uint32_t TSN_seq;	/* the TSN of this transmit */
389 	uint16_t stream_seq;	/* the stream sequence number of this transmit */
390 	uint16_t stream_number;	/* the stream number of this guy */
391 	uint32_t payloadtype;
392 	uint32_t context;	/* from send */
393 	uint32_t cwnd_at_send;
394 	/*
395 	 * part of the Highest sacked algorithm to be able to stroke counts
396 	 * on ones that are FR'd.
397 	 */
398 	uint32_t fast_retran_tsn;	/* sending_seq at the time of FR */
399 	struct timeval timetodrop;	/* time we drop it from queue */
400 	uint8_t doing_fast_retransmit;
401 	uint8_t rcv_flags;	/* flags pulled from data chunk on inbound for
402 				 * outbound holds sending flags for PR-SCTP. */
403 	uint8_t state_flags;
404 	uint8_t chunk_was_revoked;
405 	uint8_t fwd_tsn_cnt;
406 };
407 
408 TAILQ_HEAD(sctpchunk_listhead, sctp_tmit_chunk);
409 
410 /* The lower byte is used to enumerate PR_SCTP policies */
411 #define CHUNK_FLAGS_PR_SCTP_TTL	        SCTP_PR_SCTP_TTL
412 #define CHUNK_FLAGS_PR_SCTP_BUF	        SCTP_PR_SCTP_BUF
413 #define CHUNK_FLAGS_PR_SCTP_RTX         SCTP_PR_SCTP_RTX
414 
415 /* The upper byte is used as a bit mask */
416 #define CHUNK_FLAGS_FRAGMENT_OK	        0x0100
417 
418 struct chk_id {
419 	uint8_t id;
420 	uint8_t can_take_data;
421 };
422 
423 
424 struct sctp_tmit_chunk {
425 	union {
426 		struct sctp_data_chunkrec data;
427 		struct chk_id chunk_id;
428 	}     rec;
429 	struct sctp_association *asoc;	/* bp to asoc this belongs to */
430 	struct timeval sent_rcv_time;	/* filled in if RTT being calculated */
431 	struct mbuf *data;	/* pointer to mbuf chain of data */
432 	struct mbuf *last_mbuf;	/* pointer to last mbuf in chain */
433 	struct sctp_nets *whoTo;
434 	          TAILQ_ENTRY(sctp_tmit_chunk) sctp_next;	/* next link */
435 	int32_t sent;		/* the send status */
436 	uint16_t snd_count;	/* number of times I sent */
437 	uint16_t flags;		/* flags, such as FRAGMENT_OK */
438 	uint16_t send_size;
439 	uint16_t book_size;
440 	uint16_t mbcnt;
441 	uint16_t auth_keyid;
442 	uint8_t holds_key_ref;	/* flag if auth keyid refcount is held */
443 	uint8_t pad_inplace;
444 	uint8_t do_rtt;
445 	uint8_t book_size_scale;
446 	uint8_t no_fr_allowed;
447 	uint8_t copy_by_ref;
448 	uint8_t window_probe;
449 };
450 
451 /*
452  * The first part of this structure MUST be the entire sinfo structure. Maybe
453  * I should have made it a sub structure... we can circle back later and do
454  * that if we want.
455  */
456 struct sctp_queued_to_read {	/* sinfo structure Pluse more */
457 	uint16_t sinfo_stream;	/* off the wire */
458 	uint16_t sinfo_ssn;	/* off the wire */
459 	uint16_t sinfo_flags;	/* SCTP_UNORDERED from wire use SCTP_EOF for
460 				 * EOR */
461 	uint32_t sinfo_ppid;	/* off the wire */
462 	uint32_t sinfo_context;	/* pick this up from assoc def context? */
463 	uint32_t sinfo_timetolive;	/* not used by kernel */
464 	uint32_t sinfo_tsn;	/* Use this in reassembly as first TSN */
465 	uint32_t sinfo_cumtsn;	/* Use this in reassembly as last TSN */
466 	sctp_assoc_t sinfo_assoc_id;	/* our assoc id */
467 	/* Non sinfo stuff */
468 	uint32_t length;	/* length of data */
469 	uint32_t held_length;	/* length held in sb */
470 	struct sctp_nets *whoFrom;	/* where it came from */
471 	struct mbuf *data;	/* front of the mbuf chain of data with
472 				 * PKT_HDR */
473 	struct mbuf *tail_mbuf;	/* used for multi-part data */
474 	struct mbuf *aux_data;	/* used to hold/cache  control if o/s does not
475 				 * take it from us */
476 	struct sctp_tcb *stcb;	/* assoc, used for window update */
477 	         TAILQ_ENTRY(sctp_queued_to_read) next;
478 	uint16_t port_from;
479 	uint16_t spec_flags;	/* Flags to hold the notification field */
480 	uint8_t do_not_ref_stcb;
481 	uint8_t end_added;
482 	uint8_t pdapi_aborted;
483 	uint8_t some_taken;
484 };
485 
486 /* This data structure will be on the outbound
487  * stream queues. Data will be pulled off from
488  * the front of the mbuf data and chunk-ified
489  * by the output routines. We will custom
490  * fit every chunk we pull to the send/sent
491  * queue to make up the next full packet
492  * if we can. An entry cannot be removed
493  * from the stream_out queue until
494  * the msg_is_complete flag is set. This
495  * means at times data/tail_mbuf MIGHT
496  * be NULL.. If that occurs it happens
497  * for one of two reasons. Either the user
498  * is blocked on a send() call and has not
499  * awoken to copy more data down... OR
500  * the user is in the explict MSG_EOR mode
501  * and wrote some data, but has not completed
502  * sending.
503  */
504 struct sctp_stream_queue_pending {
505 	struct mbuf *data;
506 	struct mbuf *tail_mbuf;
507 	struct timeval ts;
508 	struct sctp_nets *net;
509 	          TAILQ_ENTRY(sctp_stream_queue_pending) next;
510 	          TAILQ_ENTRY(sctp_stream_queue_pending) ss_next;
511 	uint32_t length;
512 	uint32_t timetolive;
513 	uint32_t ppid;
514 	uint32_t context;
515 	uint16_t sinfo_flags;
516 	uint16_t stream;
517 	uint16_t act_flags;
518 	uint16_t auth_keyid;
519 	uint8_t holds_key_ref;
520 	uint8_t msg_is_complete;
521 	uint8_t some_taken;
522 	uint8_t sender_all_done;
523 	uint8_t put_last_out;
524 	uint8_t discard_rest;
525 };
526 
527 /*
528  * this struct contains info that is used to track inbound stream data and
529  * help with ordering.
530  */
531 TAILQ_HEAD(sctpwheelunrel_listhead, sctp_stream_in);
532 struct sctp_stream_in {
533 	struct sctp_readhead inqueue;
534 	uint16_t stream_no;
535 	uint16_t last_sequence_delivered;	/* used for re-order */
536 	uint8_t delivery_started;
537 };
538 
539 TAILQ_HEAD(sctpwheel_listhead, sctp_stream_out);
540 TAILQ_HEAD(sctplist_listhead, sctp_stream_queue_pending);
541 
542 /* Round-robin schedulers */
543 struct ss_rr {
544 	/* next link in wheel */
545 	TAILQ_ENTRY(sctp_stream_out) next_spoke;
546 };
547 
548 /* Priority scheduler */
549 struct ss_prio {
550 	/* next link in wheel */
551 	TAILQ_ENTRY(sctp_stream_out) next_spoke;
552 	/* priority id */
553 	uint16_t priority;
554 };
555 
556 /* Fair Bandwidth scheduler */
557 struct ss_fb {
558 	/* next link in wheel */
559 	TAILQ_ENTRY(sctp_stream_out) next_spoke;
560 	/* stores message size */
561 	int32_t rounds;
562 };
563 
564 /*
565  * This union holds all data necessary for
566  * different stream schedulers.
567  */
568 union scheduling_data {
569 	struct sctpwheel_listhead out_wheel;
570 	struct sctplist_listhead out_list;
571 };
572 
573 /*
574  * This union holds all parameters per stream
575  * necessary for different stream schedulers.
576  */
577 union scheduling_parameters {
578 	struct ss_rr rr;
579 	struct ss_prio prio;
580 	struct ss_fb fb;
581 };
582 
583 /* This struct is used to track the traffic on outbound streams */
584 struct sctp_stream_out {
585 	struct sctp_streamhead outqueue;
586 	union scheduling_parameters ss_params;
587 	uint32_t chunks_on_queues;
588 #if defined(SCTP_DETAILED_STR_STATS)
589 	uint32_t abandoned_unsent[SCTP_PR_SCTP_MAX + 1];
590 	uint32_t abandoned_sent[SCTP_PR_SCTP_MAX + 1];
591 #else
592 	/* Only the aggregation */
593 	uint32_t abandoned_unsent[1];
594 	uint32_t abandoned_sent[1];
595 #endif
596 	uint16_t stream_no;
597 	uint16_t next_sequence_send;	/* next one I expect to send out */
598 	uint8_t last_msg_incomplete;
599 };
600 
601 /* used to keep track of the addresses yet to try to add/delete */
602 TAILQ_HEAD(sctp_asconf_addrhead, sctp_asconf_addr);
603 struct sctp_asconf_addr {
604 	TAILQ_ENTRY(sctp_asconf_addr) next;
605 	struct sctp_asconf_addr_param ap;
606 	struct sctp_ifa *ifa;	/* save the ifa for add/del ip */
607 	uint8_t sent;		/* has this been sent yet? */
608 	uint8_t special_del;	/* not to be used in lookup */
609 };
610 
611 struct sctp_scoping {
612 	uint8_t ipv4_addr_legal;
613 	uint8_t ipv6_addr_legal;
614 	uint8_t loopback_scope;
615 	uint8_t ipv4_local_scope;
616 	uint8_t local_scope;
617 	uint8_t site_scope;
618 };
619 
620 #define SCTP_TSN_LOG_SIZE 40
621 
622 struct sctp_tsn_log {
623 	void *stcb;
624 	uint32_t tsn;
625 	uint16_t strm;
626 	uint16_t seq;
627 	uint16_t sz;
628 	uint16_t flgs;
629 	uint16_t in_pos;
630 	uint16_t in_out;
631 };
632 
633 #define SCTP_FS_SPEC_LOG_SIZE 200
634 struct sctp_fs_spec_log {
635 	uint32_t sent;
636 	uint32_t total_flight;
637 	uint32_t tsn;
638 	uint16_t book;
639 	uint8_t incr;
640 	uint8_t decr;
641 };
642 
643 /* This struct is here to cut out the compatiabilty
644  * pad that bulks up both the inp and stcb. The non
645  * pad portion MUST stay in complete sync with
646  * sctp_sndrcvinfo... i.e. if sinfo_xxxx is added
647  * this must be done here too.
648  */
649 struct sctp_nonpad_sndrcvinfo {
650 	uint16_t sinfo_stream;
651 	uint16_t sinfo_ssn;
652 	uint16_t sinfo_flags;
653 	uint32_t sinfo_ppid;
654 	uint32_t sinfo_context;
655 	uint32_t sinfo_timetolive;
656 	uint32_t sinfo_tsn;
657 	uint32_t sinfo_cumtsn;
658 	sctp_assoc_t sinfo_assoc_id;
659 	uint16_t sinfo_keynumber;
660 	uint16_t sinfo_keynumber_valid;
661 };
662 
663 /*
664  * JRS - Structure to hold function pointers to the functions responsible
665  * for congestion control.
666  */
667 
668 struct sctp_cc_functions {
669 	void (*sctp_set_initial_cc_param) (struct sctp_tcb *stcb, struct sctp_nets *net);
670 	void (*sctp_cwnd_update_after_sack) (struct sctp_tcb *stcb,
671 	         struct sctp_association *asoc,
672 	         int accum_moved, int reneged_all, int will_exit);
673 	void (*sctp_cwnd_update_exit_pf) (struct sctp_tcb *stcb, struct sctp_nets *net);
674 	void (*sctp_cwnd_update_after_fr) (struct sctp_tcb *stcb,
675 	         struct sctp_association *asoc);
676 	void (*sctp_cwnd_update_after_timeout) (struct sctp_tcb *stcb,
677 	         struct sctp_nets *net);
678 	void (*sctp_cwnd_update_after_ecn_echo) (struct sctp_tcb *stcb,
679 	         struct sctp_nets *net, int in_window, int num_pkt_lost);
680 	void (*sctp_cwnd_update_after_packet_dropped) (struct sctp_tcb *stcb,
681 	         struct sctp_nets *net, struct sctp_pktdrop_chunk *cp,
682 	         uint32_t * bottle_bw, uint32_t * on_queue);
683 	void (*sctp_cwnd_update_after_output) (struct sctp_tcb *stcb,
684 	         struct sctp_nets *net, int burst_limit);
685 	void (*sctp_cwnd_update_packet_transmitted) (struct sctp_tcb *stcb,
686 	         struct sctp_nets *net);
687 	void (*sctp_cwnd_update_tsn_acknowledged) (struct sctp_nets *net,
688 	         struct sctp_tmit_chunk *);
689 	void (*sctp_cwnd_new_transmission_begins) (struct sctp_tcb *stcb,
690 	         struct sctp_nets *net);
691 	void (*sctp_cwnd_prepare_net_for_sack) (struct sctp_tcb *stcb,
692 	         struct sctp_nets *net);
693 	int (*sctp_cwnd_socket_option) (struct sctp_tcb *stcb, int set, struct sctp_cc_option *);
694 	void (*sctp_rtt_calculated) (struct sctp_tcb *, struct sctp_nets *, struct timeval *);
695 };
696 
697 /*
698  * RS - Structure to hold function pointers to the functions responsible
699  * for stream scheduling.
700  */
701 struct sctp_ss_functions {
702 	void (*sctp_ss_init) (struct sctp_tcb *stcb, struct sctp_association *asoc,
703 	         int holds_lock);
704 	void (*sctp_ss_clear) (struct sctp_tcb *stcb, struct sctp_association *asoc,
705 	         int clear_values, int holds_lock);
706 	void (*sctp_ss_init_stream) (struct sctp_stream_out *strq, struct sctp_stream_out *with_strq);
707 	void (*sctp_ss_add_to_stream) (struct sctp_tcb *stcb, struct sctp_association *asoc,
708 	         struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
709 	int (*sctp_ss_is_empty) (struct sctp_tcb *stcb, struct sctp_association *asoc);
710 	void (*sctp_ss_remove_from_stream) (struct sctp_tcb *stcb, struct sctp_association *asoc,
711 	         struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
712 	struct sctp_stream_out *(*sctp_ss_select_stream) (struct sctp_tcb *stcb,
713 	                    struct sctp_nets *net, struct sctp_association *asoc);
714 	void (*sctp_ss_scheduled) (struct sctp_tcb *stcb, struct sctp_nets *net,
715 	         struct sctp_association *asoc, struct sctp_stream_out *strq, int moved_how_much);
716 	void (*sctp_ss_packet_done) (struct sctp_tcb *stcb, struct sctp_nets *net,
717 	         struct sctp_association *asoc);
718 	int (*sctp_ss_get_value) (struct sctp_tcb *stcb, struct sctp_association *asoc,
719 	        struct sctp_stream_out *strq, uint16_t * value);
720 	int (*sctp_ss_set_value) (struct sctp_tcb *stcb, struct sctp_association *asoc,
721 	        struct sctp_stream_out *strq, uint16_t value);
722 };
723 
724 /* used to save ASCONF chunks for retransmission */
725 TAILQ_HEAD(sctp_asconf_head, sctp_asconf);
726 struct sctp_asconf {
727 	TAILQ_ENTRY(sctp_asconf) next;
728 	uint32_t serial_number;
729 	uint16_t snd_count;
730 	struct mbuf *data;
731 	uint16_t len;
732 };
733 
734 /* used to save ASCONF-ACK chunks for retransmission */
735 TAILQ_HEAD(sctp_asconf_ackhead, sctp_asconf_ack);
736 struct sctp_asconf_ack {
737 	TAILQ_ENTRY(sctp_asconf_ack) next;
738 	uint32_t serial_number;
739 	struct sctp_nets *last_sent_to;
740 	struct mbuf *data;
741 	uint16_t len;
742 };
743 
744 /*
745  * Here we have information about each individual association that we track.
746  * We probably in production would be more dynamic. But for ease of
747  * implementation we will have a fixed array that we hunt for in a linear
748  * fashion.
749  */
750 struct sctp_association {
751 	/* association state */
752 	int state;
753 
754 	/* queue of pending addrs to add/delete */
755 	struct sctp_asconf_addrhead asconf_queue;
756 
757 	struct timeval time_entered;	/* time we entered state */
758 	struct timeval time_last_rcvd;
759 	struct timeval time_last_sent;
760 	struct timeval time_last_sat_advance;
761 	struct sctp_nonpad_sndrcvinfo def_send;
762 
763 	/* timers and such */
764 	struct sctp_timer dack_timer;	/* Delayed ack timer */
765 	struct sctp_timer asconf_timer;	/* asconf */
766 	struct sctp_timer strreset_timer;	/* stream reset */
767 	struct sctp_timer shut_guard_timer;	/* shutdown guard */
768 	struct sctp_timer autoclose_timer;	/* automatic close timer */
769 	struct sctp_timer delayed_event_timer;	/* timer for delayed events */
770 	struct sctp_timer delete_prim_timer;	/* deleting primary dst */
771 
772 	/* list of restricted local addresses */
773 	struct sctpladdr sctp_restricted_addrs;
774 
775 	/* last local address pending deletion (waiting for an address add) */
776 	struct sctp_ifa *asconf_addr_del_pending;
777 	/* Deleted primary destination (used to stop timer) */
778 	struct sctp_nets *deleted_primary;
779 
780 	struct sctpnetlisthead nets;	/* remote address list */
781 
782 	/* Free chunk list */
783 	struct sctpchunk_listhead free_chunks;
784 
785 	/* Control chunk queue */
786 	struct sctpchunk_listhead control_send_queue;
787 
788 	/* ASCONF chunk queue */
789 	struct sctpchunk_listhead asconf_send_queue;
790 
791 	/*
792 	 * Once a TSN hits the wire it is moved to the sent_queue. We
793 	 * maintain two counts here (don't know if any but retran_cnt is
794 	 * needed). The idea is that the sent_queue_retran_cnt reflects how
795 	 * many chunks have been marked for retranmission by either T3-rxt
796 	 * or FR.
797 	 */
798 	struct sctpchunk_listhead sent_queue;
799 	struct sctpchunk_listhead send_queue;
800 
801 	/* re-assembly queue for fragmented chunks on the inbound path */
802 	struct sctpchunk_listhead reasmqueue;
803 
804 	/* Scheduling queues */
805 	union scheduling_data ss_data;
806 
807 	/*
808 	 * This pointer will be set to NULL most of the time. But when we
809 	 * have a fragmented message, where we could not get out all of the
810 	 * message at the last send then this will point to the stream to go
811 	 * get data from.
812 	 */
813 	struct sctp_stream_out *locked_on_sending;
814 
815 	/* If an iterator is looking at me, this is it */
816 	struct sctp_iterator *stcb_starting_point_for_iterator;
817 
818 	/* ASCONF save the last ASCONF-ACK so we can resend it if necessary */
819 	struct sctp_asconf_ackhead asconf_ack_sent;
820 
821 	/*
822 	 * pointer to last stream reset queued to control queue by us with
823 	 * requests.
824 	 */
825 	struct sctp_tmit_chunk *str_reset;
826 	/*
827 	 * if Source Address Selection happening, this will rotate through
828 	 * the link list.
829 	 */
830 	struct sctp_laddr *last_used_address;
831 
832 	/* stream arrays */
833 	struct sctp_stream_in *strmin;
834 	struct sctp_stream_out *strmout;
835 	uint8_t *mapping_array;
836 	/* primary destination to use */
837 	struct sctp_nets *primary_destination;
838 	struct sctp_nets *alternate;	/* If primary is down or PF */
839 	/* For CMT */
840 	struct sctp_nets *last_net_cmt_send_started;
841 	/* last place I got a data chunk from */
842 	struct sctp_nets *last_data_chunk_from;
843 	/* last place I got a control from */
844 	struct sctp_nets *last_control_chunk_from;
845 
846 	/* circular looking for output selection */
847 	struct sctp_stream_out *last_out_stream;
848 
849 	/*
850 	 * wait to the point the cum-ack passes req->send_reset_at_tsn for
851 	 * any req on the list.
852 	 */
853 	struct sctp_resethead resetHead;
854 
855 	/* queue of chunks waiting to be sent into the local stack */
856 	struct sctp_readhead pending_reply_queue;
857 
858 	/* JRS - the congestion control functions are in this struct */
859 	struct sctp_cc_functions cc_functions;
860 	/*
861 	 * JRS - value to store the currently loaded congestion control
862 	 * module
863 	 */
864 	uint32_t congestion_control_module;
865 	/* RS - the stream scheduling functions are in this struct */
866 	struct sctp_ss_functions ss_functions;
867 	/* RS - value to store the currently loaded stream scheduling module */
868 	uint32_t stream_scheduling_module;
869 
870 	uint32_t vrf_id;
871 
872 	uint32_t cookie_preserve_req;
873 	/* ASCONF next seq I am sending out, inits at init-tsn */
874 	uint32_t asconf_seq_out;
875 	uint32_t asconf_seq_out_acked;
876 	/* ASCONF last received ASCONF from peer, starts at peer's TSN-1 */
877 	uint32_t asconf_seq_in;
878 
879 	/* next seq I am sending in str reset messages */
880 	uint32_t str_reset_seq_out;
881 	/* next seq I am expecting in str reset messages */
882 	uint32_t str_reset_seq_in;
883 
884 	/* various verification tag information */
885 	uint32_t my_vtag;	/* The tag to be used. if assoc is re-initited
886 				 * by remote end, and I have unlocked this
887 				 * will be regenerated to a new random value. */
888 	uint32_t peer_vtag;	/* The peers last tag */
889 
890 	uint32_t my_vtag_nonce;
891 	uint32_t peer_vtag_nonce;
892 
893 	uint32_t assoc_id;
894 
895 	/* This is the SCTP fragmentation threshold */
896 	uint32_t smallest_mtu;
897 
898 	/*
899 	 * Special hook for Fast retransmit, allows us to track the highest
900 	 * TSN that is NEW in this SACK if gap ack blocks are present.
901 	 */
902 	uint32_t this_sack_highest_gap;
903 
904 	/*
905 	 * The highest consecutive TSN that has been acked by peer on my
906 	 * sends
907 	 */
908 	uint32_t last_acked_seq;
909 
910 	/* The next TSN that I will use in sending. */
911 	uint32_t sending_seq;
912 
913 	/* Original seq number I used ??questionable to keep?? */
914 	uint32_t init_seq_number;
915 
916 
917 	/* The Advanced Peer Ack Point, as required by the PR-SCTP */
918 	/* (A1 in Section 4.2) */
919 	uint32_t advanced_peer_ack_point;
920 
921 	/*
922 	 * The highest consequetive TSN at the bottom of the mapping array
923 	 * (for his sends).
924 	 */
925 	uint32_t cumulative_tsn;
926 	/*
927 	 * Used to track the mapping array and its offset bits. This MAY be
928 	 * lower then cumulative_tsn.
929 	 */
930 	uint32_t mapping_array_base_tsn;
931 	/*
932 	 * used to track highest TSN we have received and is listed in the
933 	 * mapping array.
934 	 */
935 	uint32_t highest_tsn_inside_map;
936 
937 	/* EY - new NR variables used for nr_sack based on mapping_array */
938 	uint8_t *nr_mapping_array;
939 	uint32_t highest_tsn_inside_nr_map;
940 
941 	uint32_t fast_recovery_tsn;
942 	uint32_t sat_t3_recovery_tsn;
943 	uint32_t tsn_last_delivered;
944 	/*
945 	 * For the pd-api we should re-write this a bit more efficent. We
946 	 * could have multiple sctp_queued_to_read's that we are building at
947 	 * once. Now we only do this when we get ready to deliver to the
948 	 * socket buffer. Note that we depend on the fact that the struct is
949 	 * "stuck" on the read queue until we finish all the pd-api.
950 	 */
951 	struct sctp_queued_to_read *control_pdapi;
952 
953 	uint32_t tsn_of_pdapi_last_delivered;
954 	uint32_t pdapi_ppid;
955 	uint32_t context;
956 	uint32_t last_reset_action[SCTP_MAX_RESET_PARAMS];
957 	uint32_t last_sending_seq[SCTP_MAX_RESET_PARAMS];
958 	uint32_t last_base_tsnsent[SCTP_MAX_RESET_PARAMS];
959 #ifdef SCTP_ASOCLOG_OF_TSNS
960 	/*
961 	 * special log  - This adds considerable size to the asoc, but
962 	 * provides a log that you can use to detect problems via kgdb.
963 	 */
964 	struct sctp_tsn_log in_tsnlog[SCTP_TSN_LOG_SIZE];
965 	struct sctp_tsn_log out_tsnlog[SCTP_TSN_LOG_SIZE];
966 	uint32_t cumack_log[SCTP_TSN_LOG_SIZE];
967 	uint32_t cumack_logsnt[SCTP_TSN_LOG_SIZE];
968 	uint16_t tsn_in_at;
969 	uint16_t tsn_out_at;
970 	uint16_t tsn_in_wrapped;
971 	uint16_t tsn_out_wrapped;
972 	uint16_t cumack_log_at;
973 	uint16_t cumack_log_atsnt;
974 #endif				/* SCTP_ASOCLOG_OF_TSNS */
975 #ifdef SCTP_FS_SPEC_LOG
976 	struct sctp_fs_spec_log fslog[SCTP_FS_SPEC_LOG_SIZE];
977 	uint16_t fs_index;
978 #endif
979 
980 	/*
981 	 * window state information and smallest MTU that I use to bound
982 	 * segmentation
983 	 */
984 	uint32_t peers_rwnd;
985 	uint32_t my_rwnd;
986 	uint32_t my_last_reported_rwnd;
987 	uint32_t sctp_frag_point;
988 
989 	uint32_t total_output_queue_size;
990 
991 	uint32_t sb_cc;		/* shadow of sb_cc */
992 	uint32_t sb_send_resv;	/* amount reserved on a send */
993 	uint32_t my_rwnd_control_len;	/* shadow of sb_mbcnt used for rwnd
994 					 * control */
995 #ifdef INET6
996 	uint32_t default_flowlabel;
997 #endif
998 	uint32_t pr_sctp_cnt;
999 	int ctrl_queue_cnt;	/* could be removed  REM - NO IT CAN'T!! RRS */
1000 	/*
1001 	 * All outbound datagrams queue into this list from the individual
1002 	 * stream queue. Here they get assigned a TSN and then await
1003 	 * sending. The stream seq comes when it is first put in the
1004 	 * individual str queue
1005 	 */
1006 	unsigned int stream_queue_cnt;
1007 	unsigned int send_queue_cnt;
1008 	unsigned int sent_queue_cnt;
1009 	unsigned int sent_queue_cnt_removeable;
1010 	/*
1011 	 * Number on sent queue that are marked for retran until this value
1012 	 * is 0 we only send one packet of retran'ed data.
1013 	 */
1014 	unsigned int sent_queue_retran_cnt;
1015 
1016 	unsigned int size_on_reasm_queue;
1017 	unsigned int cnt_on_reasm_queue;
1018 	unsigned int fwd_tsn_cnt;
1019 	/* amount of data (bytes) currently in flight (on all destinations) */
1020 	unsigned int total_flight;
1021 	/* Total book size in flight */
1022 	unsigned int total_flight_count;	/* count of chunks used with
1023 						 * book total */
1024 	/* count of destinaton nets and list of destination nets */
1025 	unsigned int numnets;
1026 
1027 	/* Total error count on this association */
1028 	unsigned int overall_error_count;
1029 
1030 	unsigned int cnt_msg_on_sb;
1031 
1032 	/* All stream count of chunks for delivery */
1033 	unsigned int size_on_all_streams;
1034 	unsigned int cnt_on_all_streams;
1035 
1036 	/* Heart Beat delay in ms */
1037 	uint32_t heart_beat_delay;
1038 
1039 	/* autoclose */
1040 	unsigned int sctp_autoclose_ticks;
1041 
1042 	/* how many preopen streams we have */
1043 	unsigned int pre_open_streams;
1044 
1045 	/* How many streams I support coming into me */
1046 	unsigned int max_inbound_streams;
1047 
1048 	/* the cookie life I award for any cookie, in seconds */
1049 	unsigned int cookie_life;
1050 	/* time to delay acks for */
1051 	unsigned int delayed_ack;
1052 	unsigned int old_delayed_ack;
1053 	unsigned int sack_freq;
1054 	unsigned int data_pkts_seen;
1055 
1056 	unsigned int numduptsns;
1057 	int dup_tsns[SCTP_MAX_DUP_TSNS];
1058 	unsigned int initial_init_rto_max;	/* initial RTO for INIT's */
1059 	unsigned int initial_rto;	/* initial send RTO */
1060 	unsigned int minrto;	/* per assoc RTO-MIN */
1061 	unsigned int maxrto;	/* per assoc RTO-MAX */
1062 
1063 	/* authentication fields */
1064 	sctp_auth_chklist_t *local_auth_chunks;
1065 	sctp_auth_chklist_t *peer_auth_chunks;
1066 	sctp_hmaclist_t *local_hmacs;	/* local HMACs supported */
1067 	sctp_hmaclist_t *peer_hmacs;	/* peer HMACs supported */
1068 	struct sctp_keyhead shared_keys;	/* assoc's shared keys */
1069 	sctp_authinfo_t authinfo;	/* randoms, cached keys */
1070 	/*
1071 	 * refcnt to block freeing when a sender or receiver is off coping
1072 	 * user data in.
1073 	 */
1074 	uint32_t refcnt;
1075 	uint32_t chunks_on_out_queue;	/* total chunks floating around,
1076 					 * locked by send socket buffer */
1077 	uint32_t peers_adaptation;
1078 	uint16_t peer_hmac_id;	/* peer HMAC id to send */
1079 
1080 	/*
1081 	 * Being that we have no bag to collect stale cookies, and that we
1082 	 * really would not want to anyway.. we will count them in this
1083 	 * counter. We of course feed them to the pigeons right away (I have
1084 	 * always thought of pigeons as flying rats).
1085 	 */
1086 	uint16_t stale_cookie_count;
1087 
1088 	/*
1089 	 * For the partial delivery API, if up, invoked this is what last
1090 	 * TSN I delivered
1091 	 */
1092 	uint16_t str_of_pdapi;
1093 	uint16_t ssn_of_pdapi;
1094 
1095 	/* counts of actual built streams. Allocation may be more however */
1096 	/* could re-arrange to optimize space here. */
1097 	uint16_t streamincnt;
1098 	uint16_t streamoutcnt;
1099 	uint16_t strm_realoutsize;
1100 	uint16_t strm_pending_add_size;
1101 	/* my maximum number of retrans of INIT and SEND */
1102 	/* copied from SCTP but should be individually setable */
1103 	uint16_t max_init_times;
1104 	uint16_t max_send_times;
1105 
1106 	uint16_t def_net_failure;
1107 
1108 	uint16_t def_net_pf_threshold;
1109 
1110 	/*
1111 	 * lock flag: 0 is ok to send, 1+ (duals as a retran count) is
1112 	 * awaiting ACK
1113 	 */
1114 	uint16_t mapping_array_size;
1115 
1116 	uint16_t last_strm_seq_delivered;
1117 	uint16_t last_strm_no_delivered;
1118 
1119 	uint16_t last_revoke_count;
1120 	int16_t num_send_timers_up;
1121 
1122 	uint16_t stream_locked_on;
1123 	uint16_t ecn_echo_cnt_onq;
1124 
1125 	uint16_t free_chunk_cnt;
1126 	uint8_t stream_locked;
1127 	uint8_t authenticated;	/* packet authenticated ok */
1128 	/*
1129 	 * This flag indicates that a SACK need to be sent. Initially this
1130 	 * is 1 to send the first sACK immediately.
1131 	 */
1132 	uint8_t send_sack;
1133 
1134 	/* max burst of new packets into the network */
1135 	uint32_t max_burst;
1136 	/* max burst of fast retransmit packets */
1137 	uint32_t fr_max_burst;
1138 
1139 	uint8_t sat_network;	/* RTT is in range of sat net or greater */
1140 	uint8_t sat_network_lockout;	/* lockout code */
1141 	uint8_t burst_limit_applied;	/* Burst limit in effect at last send? */
1142 	/* flag goes on when we are doing a partial delivery api */
1143 	uint8_t hb_random_values[4];
1144 	uint8_t fragmented_delivery_inprogress;
1145 	uint8_t fragment_flags;
1146 	uint8_t last_flags_delivered;
1147 	uint8_t hb_ect_randombit;
1148 	uint8_t hb_random_idx;
1149 	uint8_t default_dscp;
1150 	uint8_t asconf_del_pending;	/* asconf delete last addr pending */
1151 
1152 	/*
1153 	 * This value, plus all other ack'd but above cum-ack is added
1154 	 * together to cross check against the bit that we have yet to
1155 	 * define (probably in the SACK). When the cum-ack is updated, this
1156 	 * sum is updated as well.
1157 	 */
1158 
1159 	/* Flags whether an extension is supported or not */
1160 	uint8_t ecn_supported;
1161 	uint8_t prsctp_supported;
1162 	uint8_t auth_supported;
1163 	uint8_t asconf_supported;
1164 	uint8_t reconfig_supported;
1165 	uint8_t nrsack_supported;
1166 	uint8_t pktdrop_supported;
1167 
1168 	/* Did the peer make the stream config (add out) request */
1169 	uint8_t peer_req_out;
1170 
1171 	uint8_t local_strreset_support;
1172 
1173 	uint8_t peer_supports_nat;
1174 
1175 	struct sctp_scoping scope;
1176 	/* flags to handle send alternate net tracking */
1177 	uint8_t used_alt_onsack;
1178 	uint8_t used_alt_asconfack;
1179 	uint8_t fast_retran_loss_recovery;
1180 	uint8_t sat_t3_loss_recovery;
1181 	uint8_t dropped_special_cnt;
1182 	uint8_t seen_a_sack_this_pkt;
1183 	uint8_t stream_reset_outstanding;
1184 	uint8_t stream_reset_out_is_outstanding;
1185 	uint8_t delayed_connection;
1186 	uint8_t ifp_had_enobuf;
1187 	uint8_t saw_sack_with_frags;
1188 	uint8_t saw_sack_with_nr_frags;
1189 	uint8_t in_asocid_hash;
1190 	uint8_t assoc_up_sent;
1191 	uint8_t adaptation_needed;
1192 	uint8_t adaptation_sent;
1193 	/* CMT variables */
1194 	uint8_t cmt_dac_pkts_rcvd;
1195 	uint8_t sctp_cmt_on_off;
1196 	uint8_t iam_blocking;
1197 	uint8_t cookie_how[8];
1198 	/* JRS 5/21/07 - CMT PF variable */
1199 	uint8_t sctp_cmt_pf;
1200 	uint8_t use_precise_time;
1201 	uint64_t sctp_features;
1202 	uint16_t port;		/* remote UDP encapsulation port */
1203 	/*
1204 	 * The mapping array is used to track out of order sequences above
1205 	 * last_acked_seq. 0 indicates packet missing 1 indicates packet
1206 	 * rec'd. We slide it up every time we raise last_acked_seq and 0
1207 	 * trailing locactions out.  If I get a TSN above the array
1208 	 * mappingArraySz, I discard the datagram and let retransmit happen.
1209 	 */
1210 	uint32_t marked_retrans;
1211 	uint32_t timoinit;
1212 	uint32_t timodata;
1213 	uint32_t timosack;
1214 	uint32_t timoshutdown;
1215 	uint32_t timoheartbeat;
1216 	uint32_t timocookie;
1217 	uint32_t timoshutdownack;
1218 	struct timeval start_time;
1219 	struct timeval discontinuity_time;
1220 	uint64_t abandoned_unsent[SCTP_PR_SCTP_MAX + 1];
1221 	uint64_t abandoned_sent[SCTP_PR_SCTP_MAX + 1];
1222 };
1223 
1224 #endif
1225