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.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
9 * a) Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
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14 * the documentation and/or other materials provided with the distribution.
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17 * contributors may be used to endorse or promote products derived
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20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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30 * THE POSSIBILITY OF SUCH DAMAGE.
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #ifndef _NETINET_SCTP_STRUCTS_H_
37 #define _NETINET_SCTP_STRUCTS_H_
39 #include <netinet/sctp_os.h>
40 #include <netinet/sctp_header.h>
41 #include <netinet/sctp_auth.h>
44 sctp_os_timer_t timer;
48 * Depending on the timer type these will be setup and cast with the
56 /* for sanity checking */
59 uint32_t stopped_from;
63 struct sctp_foo_stuff {
64 struct sctp_inpcb *inp;
72 * This is the information we track on each interface that we know about from
75 TAILQ_HEAD(sctpnetlisthead, sctp_nets);
77 struct sctp_stream_reset_list {
78 TAILQ_ENTRY(sctp_stream_reset_list) next_resp;
81 uint32_t number_entries;
82 uint16_t list_of_streams[];
85 TAILQ_HEAD(sctp_resethead, sctp_stream_reset_list);
88 * Users of the iterator need to malloc a iterator with a call to
89 * sctp_initiate_iterator(inp_func, assoc_func, inp_func, pcb_flags, pcb_features,
90 * asoc_state, void-ptr-arg, uint32-arg, end_func, inp);
92 * Use the following two defines if you don't care what pcb flags are on the EP
93 * and/or you don't care what state the association is in.
95 * Note that if you specify an INP as the last argument then ONLY each
96 * association of that single INP will be executed upon. Note that the pcb
97 * flags STILL apply so if the inp you specify has different pcb_flags then
98 * what you put in pcb_flags nothing will happen. use SCTP_PCB_ANY_FLAGS to
99 * assure the inp you specify gets treated.
101 #define SCTP_PCB_ANY_FLAGS 0x00000000
102 #define SCTP_PCB_ANY_FEATURES 0x00000000
103 #define SCTP_ASOC_ANY_STATE 0x00000000
105 typedef void (*asoc_func) (struct sctp_inpcb *, struct sctp_tcb *, void *ptr,
107 typedef int (*inp_func) (struct sctp_inpcb *, void *ptr, uint32_t val);
108 typedef void (*end_func) (void *ptr, uint32_t val);
110 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
111 /* whats on the mcore control struct */
112 struct sctp_mcore_queue {
113 TAILQ_ENTRY(sctp_mcore_queue) next;
120 TAILQ_HEAD(sctp_mcore_qhead, sctp_mcore_queue);
122 struct sctp_mcore_ctrl {
123 SCTP_PROCESS_STRUCT thread_proc;
124 struct sctp_mcore_qhead que;
135 struct sctp_iterator {
136 TAILQ_ENTRY(sctp_iterator) sctp_nxt_itr;
138 struct sctp_timer tmr;
139 struct sctp_inpcb *inp; /* current endpoint */
140 struct sctp_tcb *stcb; /* current* assoc */
141 struct sctp_inpcb *next_inp; /* special hook to skip to */
142 asoc_func function_assoc; /* per assoc function */
143 inp_func function_inp; /* per endpoint function */
144 inp_func function_inp_end; /* end INP function */
145 end_func function_atend;/* iterator completion function */
146 void *pointer; /* pointer for apply func to use */
147 uint32_t val; /* value for apply func to use */
148 uint32_t pcb_flags; /* endpoint flags being checked */
149 uint32_t pcb_features; /* endpoint features being checked */
150 uint32_t asoc_state; /* assoc state being checked */
151 uint32_t iterator_flags;
152 uint8_t no_chunk_output;
153 uint8_t done_current_ep;
156 /* iterator_flags values */
157 #define SCTP_ITERATOR_DO_ALL_INP 0x00000001
158 #define SCTP_ITERATOR_DO_SINGLE_INP 0x00000002
161 TAILQ_HEAD(sctpiterators, sctp_iterator);
163 struct sctp_copy_all {
164 struct sctp_inpcb *inp; /* ep */
166 struct sctp_sndrcvinfo sndrcv;
172 struct sctp_asconf_iterator {
173 struct sctpladdr list_of_work;
177 struct iterator_control {
178 struct mtx ipi_iterator_wq_mtx;
180 SCTP_PROCESS_STRUCT thread_proc;
181 struct sctpiterators iteratorhead;
182 struct sctp_iterator *cur_it;
183 uint32_t iterator_running;
184 uint32_t iterator_flags;
187 #define SCTP_ITERATOR_STOP_CUR_IT 0x00000004
188 #define SCTP_ITERATOR_STOP_CUR_INP 0x00000008
190 struct sctp_net_route {
191 sctp_rtentry_t *ro_rt;
197 union sctp_sockstore _l_addr; /* remote peer addr */
198 struct sctp_ifa *_s_addr; /* our selected src addr */
202 uint16_t alpha; /* Fixed point arith, << 7 */
203 uint8_t beta; /* Fixed point arith, << 7 */
204 uint8_t modeswitch; /* Delay modeswitch until we had at least one
205 * congestion event */
206 uint32_t last_cong; /* Time since last congestion event end */
207 uint32_t undo_last_cong;
208 uint16_t bytes_acked;
213 uint32_t undo_maxRTT;
214 uint32_t undo_old_maxB;
216 /* Bandwidth estimation */
225 struct timeval tls; /* The time we started the sending */
226 uint64_t lbw; /* Our last estimated bw */
227 uint64_t lbw_rtt; /* RTT at bw estimate */
228 uint64_t bw_bytes; /* The total bytes since this sending began */
229 uint64_t bw_tot_time; /* The total time since sending began */
230 uint64_t new_tot_time; /* temp holding the new value */
231 uint64_t bw_bytes_at_last_rttc; /* What bw_bytes was at last rtt calc */
232 uint32_t cwnd_at_bw_set;/* Cwnd at last bw saved - lbw */
233 uint32_t vol_reduce; /* cnt of voluntary reductions */
234 uint16_t steady_step; /* The number required to be in steady state */
235 uint16_t step_cnt; /* The current number */
236 uint8_t ret_from_eq; /* When all things are equal what do I return
237 * 0/1 - 1 no cc advance */
238 uint8_t use_dccc_ecn; /* Flag to enable DCCC ECN */
239 uint8_t tls_needs_set; /* Flag to indicate we need to set tls 0 or 1
240 * means set at send 2 not */
241 uint8_t last_step_state;/* Last state if steady state stepdown is on */
242 uint8_t rtt_set_this_sack; /* Flag saying this sack had RTT calc
244 uint8_t last_inst_ind; /* Last saved inst indication */
249 TAILQ_ENTRY(sctp_nets) sctp_next; /* next link */
252 * Things on the top half may be able to be split into a common
253 * structure shared by all.
255 struct sctp_timer pmtu_timer;
256 struct sctp_timer hb_timer;
259 * The following two in combination equate to a route entry for v6
262 struct sctp_net_route ro;
264 /* mtu discovered so far */
266 uint32_t ssthresh; /* not sure about this one for split */
267 uint32_t last_cwr_tsn;
268 uint32_t cwr_window_tsn;
269 uint32_t ecn_ce_pkt_cnt;
271 /* smoothed average things for RTT and RTO itself */
274 uint64_t rtt; /* last measured rtt value in us */
277 /* This is used for SHUTDOWN/SHUTDOWN-ACK/SEND or INIT timers */
278 struct sctp_timer rxt_timer;
280 /* last time in seconds I sent to it */
281 struct timeval last_sent_time;
282 union cc_control_data {
283 struct htcp htcp_ca; /* JRS - struct used in HTCP algorithm */
284 struct rtcc_cc rtcc; /* rtcc module cc stuff */
288 /* Congestion stats per destination */
290 * flight size variables and such, sorry Vern, I could not avoid
291 * this if I wanted performance :>
293 uint32_t flight_size;
294 uint32_t cwnd; /* actual cwnd */
295 uint32_t prev_cwnd; /* cwnd before any processing */
296 uint32_t ecn_prev_cwnd; /* ECN prev cwnd at first ecn_echo seen in new
298 uint32_t partial_bytes_acked; /* in CA tracks when to incr a MTU */
299 /* tracking variables to avoid the aloc/free in sack processing */
300 unsigned int net_ack;
301 unsigned int net_ack2;
304 * JRS - 5/8/07 - Variable to track last time a destination was
307 uint32_t last_active;
310 * CMT variables (iyengar@cis.udel.edu)
312 uint32_t this_sack_highest_newack; /* tracks highest TSN newly
313 * acked for a given dest in
314 * the current SACK. Used in
315 * SFR and HTNA algos */
316 uint32_t pseudo_cumack; /* CMT CUC algorithm. Maintains next expected
317 * pseudo-cumack for this destination */
318 uint32_t rtx_pseudo_cumack; /* CMT CUC algorithm. Maintains next
319 * expected pseudo-cumack for this
322 /* CMT fast recovery variables */
323 uint32_t fast_recovery_tsn;
324 uint32_t heartbeat_random1;
325 uint32_t heartbeat_random2;
331 struct timeval start_time; /* time when this net was created */
332 uint32_t marked_retrans;/* number or DATA chunks marked for timer
333 * based retransmissions */
334 uint32_t marked_fastretrans;
335 uint32_t heart_beat_delay; /* Heart Beat delay in ms */
337 /* if this guy is ok or not ... status */
339 /* number of timeouts to consider the destination unreachable */
340 uint16_t failure_threshold;
341 /* number of timeouts to consider the destination potentially failed */
342 uint16_t pf_threshold;
343 /* error stats on the destination */
344 uint16_t error_count;
345 /* UDP port number in case of UDP tunneling */
348 uint8_t fast_retran_loss_recovery;
349 uint8_t will_exit_fast_recovery;
350 /* Flags that probably can be combined into dest_state */
351 uint8_t fast_retran_ip; /* fast retransmit in progress */
352 uint8_t hb_responded;
353 uint8_t saw_newack; /* CMT's SFR algorithm flag */
354 uint8_t src_addr_selected; /* if we split we move */
355 uint8_t indx_of_eligible_next_to_use;
356 uint8_t addr_is_local; /* its a local address (if known) could move
360 * CMT variables (iyengar@cis.udel.edu)
362 uint8_t find_pseudo_cumack; /* CMT CUC algorithm. Flag used to
363 * find a new pseudocumack. This flag
364 * is set after a new pseudo-cumack
365 * has been received and indicates
366 * that the sender should find the
367 * next pseudo-cumack expected for
368 * this destination */
369 uint8_t find_rtx_pseudo_cumack; /* CMT CUCv2 algorithm. Flag used to
370 * find a new rtx-pseudocumack. This
371 * flag is set after a new
372 * rtx-pseudo-cumack has been received
373 * and indicates that the sender
374 * should find the next
375 * rtx-pseudo-cumack expected for this
377 uint8_t new_pseudo_cumack; /* CMT CUC algorithm. Flag used to
378 * indicate if a new pseudo-cumack or
379 * rtx-pseudo-cumack has been received */
380 uint8_t window_probe; /* Doing a window probe? */
381 uint8_t RTO_measured; /* Have we done the first measure */
382 uint8_t last_hs_used; /* index into the last HS table entry we used */
390 struct sctp_data_chunkrec {
391 uint32_t TSN_seq; /* the TSN of this transmit */
392 uint32_t stream_seq; /* the stream sequence number of this transmit */
393 uint16_t stream_number; /* the stream number of this guy */
394 uint32_t payloadtype;
395 uint32_t context; /* from send */
396 uint32_t cwnd_at_send;
398 * part of the Highest sacked algorithm to be able to stroke counts
399 * on ones that are FR'd.
401 uint32_t fast_retran_tsn; /* sending_seq at the time of FR */
402 struct timeval timetodrop; /* time we drop it from queue */
403 uint32_t fsn_num; /* Fragment Sequence Number */
404 uint8_t doing_fast_retransmit;
405 uint8_t rcv_flags; /* flags pulled from data chunk on inbound for
406 * outbound holds sending flags for PR-SCTP. */
408 uint8_t chunk_was_revoked;
412 TAILQ_HEAD(sctpchunk_listhead, sctp_tmit_chunk);
414 /* The lower byte is used to enumerate PR_SCTP policies */
415 #define CHUNK_FLAGS_PR_SCTP_TTL SCTP_PR_SCTP_TTL
416 #define CHUNK_FLAGS_PR_SCTP_BUF SCTP_PR_SCTP_BUF
417 #define CHUNK_FLAGS_PR_SCTP_RTX SCTP_PR_SCTP_RTX
419 /* The upper byte is used as a bit mask */
420 #define CHUNK_FLAGS_FRAGMENT_OK 0x0100
424 uint8_t can_take_data;
428 struct sctp_tmit_chunk {
430 struct sctp_data_chunkrec data;
431 struct chk_id chunk_id;
433 struct sctp_association *asoc; /* bp to asoc this belongs to */
434 struct timeval sent_rcv_time; /* filled in if RTT being calculated */
435 struct mbuf *data; /* pointer to mbuf chain of data */
436 struct mbuf *last_mbuf; /* pointer to last mbuf in chain */
437 struct sctp_nets *whoTo;
438 TAILQ_ENTRY(sctp_tmit_chunk) sctp_next; /* next link */
439 int32_t sent; /* the send status */
440 uint16_t snd_count; /* number of times I sent */
441 uint16_t flags; /* flags, such as FRAGMENT_OK */
446 uint8_t holds_key_ref; /* flag if auth keyid refcount is held */
449 uint8_t book_size_scale;
450 uint8_t no_fr_allowed;
452 uint8_t window_probe;
456 * The first part of this structure MUST be the entire sinfo structure. Maybe
457 * I should have made it a sub structure... we can circle back later and do
460 struct sctp_queued_to_read { /* sinfo structure Pluse more */
461 uint16_t sinfo_stream; /* off the wire */
462 uint32_t sinfo_ssn; /* off the wire */
463 uint16_t sinfo_flags; /* SCTP_UNORDERED from wire use SCTP_EOF for
465 uint32_t sinfo_ppid; /* off the wire */
466 uint32_t sinfo_context; /* pick this up from assoc def context? */
467 uint32_t sinfo_timetolive; /* not used by kernel */
468 uint32_t sinfo_tsn; /* Use this in reassembly as first TSN */
469 uint32_t sinfo_cumtsn; /* Use this in reassembly as last TSN */
470 sctp_assoc_t sinfo_assoc_id; /* our assoc id */
471 /* Non sinfo stuff */
472 uint32_t msg_id; /* Fragment Index */
473 uint32_t length; /* length of data */
474 uint32_t held_length; /* length held in sb */
475 uint32_t top_fsn; /* Highest FSN in queue */
476 uint32_t fsn_included; /* Highest FSN in *data portion */
477 struct sctp_nets *whoFrom; /* where it came from */
478 struct mbuf *data; /* front of the mbuf chain of data with
480 struct mbuf *tail_mbuf; /* used for multi-part data */
481 struct mbuf *aux_data; /* used to hold/cache control if o/s does not
483 struct sctp_tcb *stcb; /* assoc, used for window update */
484 TAILQ_ENTRY(sctp_queued_to_read) next;
485 TAILQ_ENTRY(sctp_queued_to_read) next_instrm;
486 struct sctpchunk_listhead reasm;
488 uint16_t spec_flags; /* Flags to hold the notification field */
489 uint8_t do_not_ref_stcb;
491 uint8_t pdapi_aborted;
492 uint8_t pdapi_started;
494 uint8_t last_frag_seen;
495 uint8_t first_frag_seen;
500 #define SCTP_ON_ORDERED 1
501 #define SCTP_ON_UNORDERED 2
503 /* This data structure will be on the outbound
504 * stream queues. Data will be pulled off from
505 * the front of the mbuf data and chunk-ified
506 * by the output routines. We will custom
507 * fit every chunk we pull to the send/sent
508 * queue to make up the next full packet
509 * if we can. An entry cannot be removed
510 * from the stream_out queue until
511 * the msg_is_complete flag is set. This
512 * means at times data/tail_mbuf MIGHT
513 * be NULL.. If that occurs it happens
514 * for one of two reasons. Either the user
515 * is blocked on a send() call and has not
516 * awoken to copy more data down... OR
517 * the user is in the explict MSG_EOR mode
518 * and wrote some data, but has not completed
521 struct sctp_stream_queue_pending {
523 struct mbuf *tail_mbuf;
525 struct sctp_nets *net;
526 TAILQ_ENTRY(sctp_stream_queue_pending) next;
527 TAILQ_ENTRY(sctp_stream_queue_pending) ss_next;
534 uint16_t sinfo_flags;
538 uint8_t holds_key_ref;
539 uint8_t msg_is_complete;
541 uint8_t sender_all_done;
542 uint8_t put_last_out;
543 uint8_t discard_rest;
547 * this struct contains info that is used to track inbound stream data and
548 * help with ordering.
550 TAILQ_HEAD(sctpwheelunrel_listhead, sctp_stream_in);
551 struct sctp_stream_in {
552 struct sctp_readhead inqueue;
553 struct sctp_readhead uno_inqueue;
554 uint32_t last_sequence_delivered; /* used for re-order */
556 uint8_t delivery_started;
557 uint8_t pd_api_started;
560 TAILQ_HEAD(sctpwheel_listhead, sctp_stream_out);
561 TAILQ_HEAD(sctplist_listhead, sctp_stream_queue_pending);
563 /* Round-robin schedulers */
565 /* next link in wheel */
566 TAILQ_ENTRY(sctp_stream_out) next_spoke;
569 /* Priority scheduler */
571 /* next link in wheel */
572 TAILQ_ENTRY(sctp_stream_out) next_spoke;
577 /* Fair Bandwidth scheduler */
579 /* next link in wheel */
580 TAILQ_ENTRY(sctp_stream_out) next_spoke;
581 /* stores message size */
586 * This union holds all data necessary for
587 * different stream schedulers.
589 union scheduling_data {
590 struct sctpwheel_listhead out_wheel;
591 struct sctplist_listhead out_list;
595 * This union holds all parameters per stream
596 * necessary for different stream schedulers.
598 union scheduling_parameters {
604 /* States for outgoing streams */
605 #define SCTP_STREAM_CLOSED 0x00
606 #define SCTP_STREAM_OPENING 0x01
607 #define SCTP_STREAM_OPEN 0x02
608 #define SCTP_STREAM_RESET_PENDING 0x03
609 #define SCTP_STREAM_RESET_IN_FLIGHT 0x04
611 #define SCTP_MAX_STREAMS_AT_ONCE_RESET 200
613 /* This struct is used to track the traffic on outbound streams */
614 struct sctp_stream_out {
615 struct sctp_streamhead outqueue;
616 union scheduling_parameters ss_params;
617 uint32_t chunks_on_queues; /* send queue and sent queue */
618 #if defined(SCTP_DETAILED_STR_STATS)
619 uint32_t abandoned_unsent[SCTP_PR_SCTP_MAX + 1];
620 uint32_t abandoned_sent[SCTP_PR_SCTP_MAX + 1];
622 /* Only the aggregation */
623 uint32_t abandoned_unsent[1];
624 uint32_t abandoned_sent[1];
626 uint32_t next_sequence_send; /* next one I expect to send out */
628 uint8_t last_msg_incomplete;
632 /* used to keep track of the addresses yet to try to add/delete */
633 TAILQ_HEAD(sctp_asconf_addrhead, sctp_asconf_addr);
634 struct sctp_asconf_addr {
635 TAILQ_ENTRY(sctp_asconf_addr) next;
636 struct sctp_asconf_addr_param ap;
637 struct sctp_ifa *ifa; /* save the ifa for add/del ip */
638 uint8_t sent; /* has this been sent yet? */
639 uint8_t special_del; /* not to be used in lookup */
642 struct sctp_scoping {
643 uint8_t ipv4_addr_legal;
644 uint8_t ipv6_addr_legal;
645 uint8_t loopback_scope;
646 uint8_t ipv4_local_scope;
651 #define SCTP_TSN_LOG_SIZE 40
653 struct sctp_tsn_log {
665 #define SCTP_FS_SPEC_LOG_SIZE 200
666 struct sctp_fs_spec_log {
668 uint32_t total_flight;
675 /* This struct is here to cut out the compatiabilty
676 * pad that bulks up both the inp and stcb. The non
677 * pad portion MUST stay in complete sync with
678 * sctp_sndrcvinfo... i.e. if sinfo_xxxx is added
679 * this must be done here too.
681 struct sctp_nonpad_sndrcvinfo {
682 uint16_t sinfo_stream;
684 uint16_t sinfo_flags;
686 uint32_t sinfo_context;
687 uint32_t sinfo_timetolive;
689 uint32_t sinfo_cumtsn;
690 sctp_assoc_t sinfo_assoc_id;
691 uint16_t sinfo_keynumber;
692 uint16_t sinfo_keynumber_valid;
696 * JRS - Structure to hold function pointers to the functions responsible
697 * for congestion control.
700 struct sctp_cc_functions {
701 void (*sctp_set_initial_cc_param) (struct sctp_tcb *stcb, struct sctp_nets *net);
702 void (*sctp_cwnd_update_after_sack) (struct sctp_tcb *stcb,
703 struct sctp_association *asoc,
704 int accum_moved, int reneged_all, int will_exit);
705 void (*sctp_cwnd_update_exit_pf) (struct sctp_tcb *stcb, struct sctp_nets *net);
706 void (*sctp_cwnd_update_after_fr) (struct sctp_tcb *stcb,
707 struct sctp_association *asoc);
708 void (*sctp_cwnd_update_after_timeout) (struct sctp_tcb *stcb,
709 struct sctp_nets *net);
710 void (*sctp_cwnd_update_after_ecn_echo) (struct sctp_tcb *stcb,
711 struct sctp_nets *net, int in_window, int num_pkt_lost);
712 void (*sctp_cwnd_update_after_packet_dropped) (struct sctp_tcb *stcb,
713 struct sctp_nets *net, struct sctp_pktdrop_chunk *cp,
714 uint32_t * bottle_bw, uint32_t * on_queue);
715 void (*sctp_cwnd_update_after_output) (struct sctp_tcb *stcb,
716 struct sctp_nets *net, int burst_limit);
717 void (*sctp_cwnd_update_packet_transmitted) (struct sctp_tcb *stcb,
718 struct sctp_nets *net);
719 void (*sctp_cwnd_update_tsn_acknowledged) (struct sctp_nets *net,
720 struct sctp_tmit_chunk *);
721 void (*sctp_cwnd_new_transmission_begins) (struct sctp_tcb *stcb,
722 struct sctp_nets *net);
723 void (*sctp_cwnd_prepare_net_for_sack) (struct sctp_tcb *stcb,
724 struct sctp_nets *net);
725 int (*sctp_cwnd_socket_option) (struct sctp_tcb *stcb, int set, struct sctp_cc_option *);
726 void (*sctp_rtt_calculated) (struct sctp_tcb *, struct sctp_nets *, struct timeval *);
730 * RS - Structure to hold function pointers to the functions responsible
731 * for stream scheduling.
733 struct sctp_ss_functions {
734 void (*sctp_ss_init) (struct sctp_tcb *stcb, struct sctp_association *asoc,
736 void (*sctp_ss_clear) (struct sctp_tcb *stcb, struct sctp_association *asoc,
737 int clear_values, int holds_lock);
738 void (*sctp_ss_init_stream) (struct sctp_stream_out *strq, struct sctp_stream_out *with_strq);
739 void (*sctp_ss_add_to_stream) (struct sctp_tcb *stcb, struct sctp_association *asoc,
740 struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
741 int (*sctp_ss_is_empty) (struct sctp_tcb *stcb, struct sctp_association *asoc);
742 void (*sctp_ss_remove_from_stream) (struct sctp_tcb *stcb, struct sctp_association *asoc,
743 struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
744 struct sctp_stream_out *(*sctp_ss_select_stream) (struct sctp_tcb *stcb,
745 struct sctp_nets *net, struct sctp_association *asoc);
746 void (*sctp_ss_scheduled) (struct sctp_tcb *stcb, struct sctp_nets *net,
747 struct sctp_association *asoc, struct sctp_stream_out *strq, int moved_how_much);
748 void (*sctp_ss_packet_done) (struct sctp_tcb *stcb, struct sctp_nets *net,
749 struct sctp_association *asoc);
750 int (*sctp_ss_get_value) (struct sctp_tcb *stcb, struct sctp_association *asoc,
751 struct sctp_stream_out *strq, uint16_t * value);
752 int (*sctp_ss_set_value) (struct sctp_tcb *stcb, struct sctp_association *asoc,
753 struct sctp_stream_out *strq, uint16_t value);
756 /* used to save ASCONF chunks for retransmission */
757 TAILQ_HEAD(sctp_asconf_head, sctp_asconf);
759 TAILQ_ENTRY(sctp_asconf) next;
760 uint32_t serial_number;
766 /* used to save ASCONF-ACK chunks for retransmission */
767 TAILQ_HEAD(sctp_asconf_ackhead, sctp_asconf_ack);
768 struct sctp_asconf_ack {
769 TAILQ_ENTRY(sctp_asconf_ack) next;
770 uint32_t serial_number;
771 struct sctp_nets *last_sent_to;
777 * Here we have information about each individual association that we track.
778 * We probably in production would be more dynamic. But for ease of
779 * implementation we will have a fixed array that we hunt for in a linear
782 struct sctp_association {
783 /* association state */
786 /* queue of pending addrs to add/delete */
787 struct sctp_asconf_addrhead asconf_queue;
789 struct timeval time_entered; /* time we entered state */
790 struct timeval time_last_rcvd;
791 struct timeval time_last_sent;
792 struct timeval time_last_sat_advance;
793 struct sctp_nonpad_sndrcvinfo def_send;
795 /* timers and such */
796 struct sctp_timer dack_timer; /* Delayed ack timer */
797 struct sctp_timer asconf_timer; /* asconf */
798 struct sctp_timer strreset_timer; /* stream reset */
799 struct sctp_timer shut_guard_timer; /* shutdown guard */
800 struct sctp_timer autoclose_timer; /* automatic close timer */
801 struct sctp_timer delayed_event_timer; /* timer for delayed events */
802 struct sctp_timer delete_prim_timer; /* deleting primary dst */
804 /* list of restricted local addresses */
805 struct sctpladdr sctp_restricted_addrs;
807 /* last local address pending deletion (waiting for an address add) */
808 struct sctp_ifa *asconf_addr_del_pending;
809 /* Deleted primary destination (used to stop timer) */
810 struct sctp_nets *deleted_primary;
812 struct sctpnetlisthead nets; /* remote address list */
814 /* Free chunk list */
815 struct sctpchunk_listhead free_chunks;
817 /* Control chunk queue */
818 struct sctpchunk_listhead control_send_queue;
820 /* ASCONF chunk queue */
821 struct sctpchunk_listhead asconf_send_queue;
824 * Once a TSN hits the wire it is moved to the sent_queue. We
825 * maintain two counts here (don't know if any but retran_cnt is
826 * needed). The idea is that the sent_queue_retran_cnt reflects how
827 * many chunks have been marked for retranmission by either T3-rxt
830 struct sctpchunk_listhead sent_queue;
831 struct sctpchunk_listhead send_queue;
833 /* Scheduling queues */
834 union scheduling_data ss_data;
837 * This pointer will be set to NULL most of the time. But when we
838 * have a fragmented message, where we could not get out all of the
839 * message at the last send then this will point to the stream to go
842 struct sctp_stream_out *locked_on_sending;
844 /* If an iterator is looking at me, this is it */
845 struct sctp_iterator *stcb_starting_point_for_iterator;
847 /* ASCONF save the last ASCONF-ACK so we can resend it if necessary */
848 struct sctp_asconf_ackhead asconf_ack_sent;
851 * pointer to last stream reset queued to control queue by us with
854 struct sctp_tmit_chunk *str_reset;
856 * if Source Address Selection happening, this will rotate through
859 struct sctp_laddr *last_used_address;
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 */
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;
875 /* circular looking for output selection */
876 struct sctp_stream_out *last_out_stream;
879 * wait to the point the cum-ack passes req->send_reset_at_tsn for
880 * any req on the list.
882 struct sctp_resethead resetHead;
884 /* queue of chunks waiting to be sent into the local stack */
885 struct sctp_readhead pending_reply_queue;
887 /* JRS - the congestion control functions are in this struct */
888 struct sctp_cc_functions cc_functions;
890 * JRS - value to store the currently loaded congestion control
893 uint32_t congestion_control_module;
894 /* RS - the stream scheduling functions are in this struct */
895 struct sctp_ss_functions ss_functions;
896 /* RS - value to store the currently loaded stream scheduling module */
897 uint32_t stream_scheduling_module;
900 uint32_t assoc_msg_id;
901 uint32_t cookie_preserve_req;
902 /* ASCONF next seq I am sending out, inits at init-tsn */
903 uint32_t asconf_seq_out;
904 uint32_t asconf_seq_out_acked;
905 /* ASCONF last received ASCONF from peer, starts at peer's TSN-1 */
906 uint32_t asconf_seq_in;
908 /* next seq I am sending in str reset messages */
909 uint32_t str_reset_seq_out;
910 /* next seq I am expecting in str reset messages */
911 uint32_t str_reset_seq_in;
913 /* various verification tag information */
914 uint32_t my_vtag; /* The tag to be used. if assoc is re-initited
915 * by remote end, and I have unlocked this
916 * will be regenerated to a new random value. */
917 uint32_t peer_vtag; /* The peers last tag */
919 uint32_t my_vtag_nonce;
920 uint32_t peer_vtag_nonce;
924 /* This is the SCTP fragmentation threshold */
925 uint32_t smallest_mtu;
928 * Special hook for Fast retransmit, allows us to track the highest
929 * TSN that is NEW in this SACK if gap ack blocks are present.
931 uint32_t this_sack_highest_gap;
934 * The highest consecutive TSN that has been acked by peer on my
937 uint32_t last_acked_seq;
939 /* The next TSN that I will use in sending. */
940 uint32_t sending_seq;
942 /* Original seq number I used ??questionable to keep?? */
943 uint32_t init_seq_number;
946 /* The Advanced Peer Ack Point, as required by the PR-SCTP */
947 /* (A1 in Section 4.2) */
948 uint32_t advanced_peer_ack_point;
951 * The highest consequetive TSN at the bottom of the mapping array
954 uint32_t cumulative_tsn;
956 * Used to track the mapping array and its offset bits. This MAY be
957 * lower then cumulative_tsn.
959 uint32_t mapping_array_base_tsn;
961 * used to track highest TSN we have received and is listed in the
964 uint32_t highest_tsn_inside_map;
966 /* EY - new NR variables used for nr_sack based on mapping_array */
967 uint8_t *nr_mapping_array;
968 uint32_t highest_tsn_inside_nr_map;
970 uint32_t fast_recovery_tsn;
971 uint32_t sat_t3_recovery_tsn;
972 uint32_t tsn_last_delivered;
974 * For the pd-api we should re-write this a bit more efficent. We
975 * could have multiple sctp_queued_to_read's that we are building at
976 * once. Now we only do this when we get ready to deliver to the
977 * socket buffer. Note that we depend on the fact that the struct is
978 * "stuck" on the read queue until we finish all the pd-api.
980 struct sctp_queued_to_read *control_pdapi;
982 uint32_t tsn_of_pdapi_last_delivered;
985 uint32_t last_reset_action[SCTP_MAX_RESET_PARAMS];
986 uint32_t last_sending_seq[SCTP_MAX_RESET_PARAMS];
987 uint32_t last_base_tsnsent[SCTP_MAX_RESET_PARAMS];
988 #ifdef SCTP_ASOCLOG_OF_TSNS
990 * special log - This adds considerable size to the asoc, but
991 * provides a log that you can use to detect problems via kgdb.
993 struct sctp_tsn_log in_tsnlog[SCTP_TSN_LOG_SIZE];
994 struct sctp_tsn_log out_tsnlog[SCTP_TSN_LOG_SIZE];
995 uint32_t cumack_log[SCTP_TSN_LOG_SIZE];
996 uint32_t cumack_logsnt[SCTP_TSN_LOG_SIZE];
999 uint16_t tsn_in_wrapped;
1000 uint16_t tsn_out_wrapped;
1001 uint16_t cumack_log_at;
1002 uint16_t cumack_log_atsnt;
1003 #endif /* SCTP_ASOCLOG_OF_TSNS */
1004 #ifdef SCTP_FS_SPEC_LOG
1005 struct sctp_fs_spec_log fslog[SCTP_FS_SPEC_LOG_SIZE];
1010 * window state information and smallest MTU that I use to bound
1013 uint32_t peers_rwnd;
1015 uint32_t my_last_reported_rwnd;
1016 uint32_t sctp_frag_point;
1018 uint32_t total_output_queue_size;
1020 uint32_t sb_cc; /* shadow of sb_cc */
1021 uint32_t sb_send_resv; /* amount reserved on a send */
1022 uint32_t my_rwnd_control_len; /* shadow of sb_mbcnt used for rwnd
1025 uint32_t default_flowlabel;
1027 uint32_t pr_sctp_cnt;
1028 int ctrl_queue_cnt; /* could be removed REM - NO IT CAN'T!! RRS */
1030 * All outbound datagrams queue into this list from the individual
1031 * stream queue. Here they get assigned a TSN and then await
1032 * sending. The stream seq comes when it is first put in the
1033 * individual str queue
1035 unsigned int stream_queue_cnt;
1036 unsigned int send_queue_cnt;
1037 unsigned int sent_queue_cnt;
1038 unsigned int sent_queue_cnt_removeable;
1040 * Number on sent queue that are marked for retran until this value
1041 * is 0 we only send one packet of retran'ed data.
1043 unsigned int sent_queue_retran_cnt;
1045 unsigned int size_on_reasm_queue;
1046 unsigned int cnt_on_reasm_queue;
1047 unsigned int fwd_tsn_cnt;
1048 /* amount of data (bytes) currently in flight (on all destinations) */
1049 unsigned int total_flight;
1050 /* Total book size in flight */
1051 unsigned int total_flight_count; /* count of chunks used with
1053 /* count of destinaton nets and list of destination nets */
1054 unsigned int numnets;
1056 /* Total error count on this association */
1057 unsigned int overall_error_count;
1059 unsigned int cnt_msg_on_sb;
1061 /* All stream count of chunks for delivery */
1062 unsigned int size_on_all_streams;
1063 unsigned int cnt_on_all_streams;
1065 /* Heart Beat delay in ms */
1066 uint32_t heart_beat_delay;
1069 unsigned int sctp_autoclose_ticks;
1071 /* how many preopen streams we have */
1072 unsigned int pre_open_streams;
1074 /* How many streams I support coming into me */
1075 unsigned int max_inbound_streams;
1077 /* the cookie life I award for any cookie, in seconds */
1078 unsigned int cookie_life;
1079 /* time to delay acks for */
1080 unsigned int delayed_ack;
1081 unsigned int old_delayed_ack;
1082 unsigned int sack_freq;
1083 unsigned int data_pkts_seen;
1085 unsigned int numduptsns;
1086 int dup_tsns[SCTP_MAX_DUP_TSNS];
1087 unsigned int initial_init_rto_max; /* initial RTO for INIT's */
1088 unsigned int initial_rto; /* initial send RTO */
1089 unsigned int minrto; /* per assoc RTO-MIN */
1090 unsigned int maxrto; /* per assoc RTO-MAX */
1092 /* authentication fields */
1093 sctp_auth_chklist_t *local_auth_chunks;
1094 sctp_auth_chklist_t *peer_auth_chunks;
1095 sctp_hmaclist_t *local_hmacs; /* local HMACs supported */
1096 sctp_hmaclist_t *peer_hmacs; /* peer HMACs supported */
1097 struct sctp_keyhead shared_keys; /* assoc's shared keys */
1098 sctp_authinfo_t authinfo; /* randoms, cached keys */
1100 * refcnt to block freeing when a sender or receiver is off coping
1104 uint32_t chunks_on_out_queue; /* total chunks floating around,
1105 * locked by send socket buffer */
1106 uint32_t peers_adaptation;
1107 uint16_t peer_hmac_id; /* peer HMAC id to send */
1110 * Being that we have no bag to collect stale cookies, and that we
1111 * really would not want to anyway.. we will count them in this
1112 * counter. We of course feed them to the pigeons right away (I have
1113 * always thought of pigeons as flying rats).
1115 uint16_t stale_cookie_count;
1118 * For the partial delivery API, if up, invoked this is what last
1121 uint16_t str_of_pdapi;
1122 uint16_t ssn_of_pdapi;
1124 /* counts of actual built streams. Allocation may be more however */
1125 /* could re-arrange to optimize space here. */
1126 uint16_t streamincnt;
1127 uint16_t streamoutcnt;
1128 uint16_t strm_realoutsize;
1129 uint16_t strm_pending_add_size;
1130 /* my maximum number of retrans of INIT and SEND */
1131 /* copied from SCTP but should be individually setable */
1132 uint16_t max_init_times;
1133 uint16_t max_send_times;
1135 uint16_t def_net_failure;
1137 uint16_t def_net_pf_threshold;
1140 * lock flag: 0 is ok to send, 1+ (duals as a retran count) is
1143 uint16_t mapping_array_size;
1145 uint16_t last_strm_seq_delivered;
1146 uint16_t last_strm_no_delivered;
1148 uint16_t last_revoke_count;
1149 int16_t num_send_timers_up;
1151 uint16_t stream_locked_on;
1152 uint16_t ecn_echo_cnt_onq;
1154 uint16_t free_chunk_cnt;
1155 uint8_t stream_locked;
1156 uint8_t authenticated; /* packet authenticated ok */
1158 * This flag indicates that a SACK need to be sent. Initially this
1159 * is 1 to send the first sACK immediately.
1163 /* max burst of new packets into the network */
1165 /* max burst of fast retransmit packets */
1166 uint32_t fr_max_burst;
1168 uint8_t sat_network; /* RTT is in range of sat net or greater */
1169 uint8_t sat_network_lockout; /* lockout code */
1170 uint8_t burst_limit_applied; /* Burst limit in effect at last send? */
1171 /* flag goes on when we are doing a partial delivery api */
1172 uint8_t hb_random_values[4];
1173 uint8_t fragmented_delivery_inprogress;
1174 uint8_t fragment_flags;
1175 uint8_t last_flags_delivered;
1176 uint8_t hb_ect_randombit;
1177 uint8_t hb_random_idx;
1178 uint8_t default_dscp;
1179 uint8_t asconf_del_pending; /* asconf delete last addr pending */
1180 uint8_t trigger_reset;
1182 * This value, plus all other ack'd but above cum-ack is added
1183 * together to cross check against the bit that we have yet to
1184 * define (probably in the SACK). When the cum-ack is updated, this
1185 * sum is updated as well.
1188 /* Flags whether an extension is supported or not */
1189 uint8_t ecn_supported;
1190 uint8_t prsctp_supported;
1191 uint8_t auth_supported;
1192 uint8_t asconf_supported;
1193 uint8_t reconfig_supported;
1194 uint8_t nrsack_supported;
1195 uint8_t pktdrop_supported;
1196 uint8_t idata_supported;
1198 /* Did the peer make the stream config (add out) request */
1199 uint8_t peer_req_out;
1201 uint8_t local_strreset_support;
1202 uint8_t peer_supports_nat;
1204 struct sctp_scoping scope;
1205 /* flags to handle send alternate net tracking */
1206 uint8_t used_alt_asconfack;
1207 uint8_t fast_retran_loss_recovery;
1208 uint8_t sat_t3_loss_recovery;
1209 uint8_t dropped_special_cnt;
1210 uint8_t seen_a_sack_this_pkt;
1211 uint8_t stream_reset_outstanding;
1212 uint8_t stream_reset_out_is_outstanding;
1213 uint8_t delayed_connection;
1214 uint8_t ifp_had_enobuf;
1215 uint8_t saw_sack_with_frags;
1216 uint8_t saw_sack_with_nr_frags;
1217 uint8_t in_asocid_hash;
1218 uint8_t assoc_up_sent;
1219 uint8_t adaptation_needed;
1220 uint8_t adaptation_sent;
1222 uint8_t cmt_dac_pkts_rcvd;
1223 uint8_t sctp_cmt_on_off;
1224 uint8_t iam_blocking;
1225 uint8_t cookie_how[8];
1226 /* JRS 5/21/07 - CMT PF variable */
1227 uint8_t sctp_cmt_pf;
1228 uint8_t use_precise_time;
1229 uint64_t sctp_features;
1231 uint16_t port; /* remote UDP encapsulation port */
1233 * The mapping array is used to track out of order sequences above
1234 * last_acked_seq. 0 indicates packet missing 1 indicates packet
1235 * rec'd. We slide it up every time we raise last_acked_seq and 0
1236 * trailing locactions out. If I get a TSN above the array
1237 * mappingArraySz, I discard the datagram and let retransmit happen.
1239 uint32_t marked_retrans;
1243 uint32_t timoshutdown;
1244 uint32_t timoheartbeat;
1245 uint32_t timocookie;
1246 uint32_t timoshutdownack;
1247 struct timeval start_time;
1248 struct timeval discontinuity_time;
1249 uint64_t abandoned_unsent[SCTP_PR_SCTP_MAX + 1];
1250 uint64_t abandoned_sent[SCTP_PR_SCTP_MAX + 1];