2 * SPDX-License-Identifier: BSD-3-Clause
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.
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9 * modification, are permitted provided that the following conditions are met:
11 * a) Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
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35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #ifndef _NETINET_SCTP_STRUCTS_H_
39 #define _NETINET_SCTP_STRUCTS_H_
41 #include <netinet/sctp_os.h>
42 #include <netinet/sctp_header.h>
43 #include <netinet/sctp_auth.h>
46 sctp_os_timer_t timer;
50 * Depending on the timer type these will be setup and cast with the
58 /* for sanity checking */
61 uint32_t stopped_from;
65 struct sctp_foo_stuff {
66 struct sctp_inpcb *inp;
74 * This is the information we track on each interface that we know about from
77 TAILQ_HEAD(sctpnetlisthead, sctp_nets);
79 struct sctp_stream_reset_list {
80 TAILQ_ENTRY(sctp_stream_reset_list) next_resp;
83 uint32_t number_entries;
84 uint16_t list_of_streams[];
87 TAILQ_HEAD(sctp_resethead, sctp_stream_reset_list);
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);
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.
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.
103 #define SCTP_PCB_ANY_FLAGS 0x00000000
104 #define SCTP_PCB_ANY_FEATURES 0x00000000
105 #define SCTP_ASOC_ANY_STATE 0x00000000
107 typedef void (*asoc_func) (struct sctp_inpcb *, struct sctp_tcb *, void *ptr,
109 typedef int (*inp_func) (struct sctp_inpcb *, void *ptr, uint32_t val);
110 typedef void (*end_func) (void *ptr, uint32_t val);
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;
122 TAILQ_HEAD(sctp_mcore_qhead, sctp_mcore_queue);
124 struct sctp_mcore_ctrl {
125 SCTP_PROCESS_STRUCT thread_proc;
126 struct sctp_mcore_qhead que;
137 struct sctp_iterator {
138 TAILQ_ENTRY(sctp_iterator) sctp_nxt_itr;
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;
158 /* iterator_flags values */
159 #define SCTP_ITERATOR_DO_ALL_INP 0x00000001
160 #define SCTP_ITERATOR_DO_SINGLE_INP 0x00000002
163 TAILQ_HEAD(sctpiterators, sctp_iterator);
165 struct sctp_copy_all {
166 struct sctp_inpcb *inp; /* ep */
168 struct sctp_sndrcvinfo sndrcv;
174 struct sctp_asconf_iterator {
175 struct sctpladdr list_of_work;
179 struct iterator_control {
180 struct mtx ipi_iterator_wq_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;
188 #define SCTP_ITERATOR_STOP_CUR_IT 0x00000004
189 #define SCTP_ITERATOR_STOP_CUR_INP 0x00000008
191 struct sctp_net_route {
192 sctp_rtentry_t *ro_rt;
193 struct llentry *ro_lle;
199 union sctp_sockstore _l_addr; /* remote peer addr */
200 struct sctp_ifa *_s_addr; /* our selected src addr */
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;
215 uint32_t undo_maxRTT;
216 uint32_t undo_old_maxB;
218 /* Bandwidth estimation */
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 is on */
244 uint8_t rtt_set_this_sack; /* Flag saying this sack had RTT calc
246 uint8_t last_inst_ind; /* Last saved inst indication */
251 TAILQ_ENTRY(sctp_nets) sctp_next; /* next link */
254 * Things on the top half may be able to be split into a common
255 * structure shared by all.
257 struct sctp_timer pmtu_timer;
258 struct sctp_timer hb_timer;
261 * The following two in combination equate to a route entry for v6
264 struct sctp_net_route ro;
266 /* mtu discovered so far */
268 uint32_t ssthresh; /* not sure about this one for split */
269 uint32_t last_cwr_tsn;
270 uint32_t cwr_window_tsn;
271 uint32_t ecn_ce_pkt_cnt;
273 /* smoothed average things for RTT and RTO itself */
276 uint64_t rtt; /* last measured rtt value in us */
279 /* This is used for SHUTDOWN/SHUTDOWN-ACK/SEND or INIT timers */
280 struct sctp_timer rxt_timer;
282 /* last time in seconds I sent to it */
283 struct timeval last_sent_time;
284 union cc_control_data {
285 struct htcp htcp_ca; /* JRS - struct used in HTCP algorithm */
286 struct rtcc_cc rtcc; /* rtcc module cc stuff */
290 /* Congestion stats per destination */
292 * flight size variables and such, sorry Vern, I could not avoid
293 * this if I wanted performance :>
295 uint32_t flight_size;
296 uint32_t cwnd; /* actual cwnd */
297 uint32_t prev_cwnd; /* cwnd before any processing */
298 uint32_t ecn_prev_cwnd; /* ECN prev cwnd at first ecn_echo seen in new
300 uint32_t partial_bytes_acked; /* in CA tracks when to incr a MTU */
301 /* tracking variables to avoid the aloc/free in sack processing */
302 unsigned int net_ack;
303 unsigned int net_ack2;
306 * JRS - 5/8/07 - Variable to track last time a destination was
309 uint32_t last_active;
312 * CMT variables (iyengar@cis.udel.edu)
314 uint32_t this_sack_highest_newack; /* tracks highest TSN newly
315 * acked for a given dest in
316 * the current SACK. Used in
317 * SFR and HTNA algos */
318 uint32_t pseudo_cumack; /* CMT CUC algorithm. Maintains next expected
319 * pseudo-cumack for this destination */
320 uint32_t rtx_pseudo_cumack; /* CMT CUC algorithm. Maintains next
321 * expected pseudo-cumack for this
324 /* CMT fast recovery variables */
325 uint32_t fast_recovery_tsn;
326 uint32_t heartbeat_random1;
327 uint32_t heartbeat_random2;
333 struct timeval start_time; /* time when this net was created */
334 uint32_t marked_retrans;/* number or DATA chunks marked for timer
335 * based retransmissions */
336 uint32_t marked_fastretrans;
337 uint32_t heart_beat_delay; /* Heart Beat delay in ms */
339 /* if this guy is ok or not ... status */
341 /* number of timeouts to consider the destination unreachable */
342 uint16_t failure_threshold;
343 /* number of timeouts to consider the destination potentially failed */
344 uint16_t pf_threshold;
345 /* error stats on the destination */
346 uint16_t error_count;
347 /* UDP port number in case of UDP tunneling */
350 uint8_t fast_retran_loss_recovery;
351 uint8_t will_exit_fast_recovery;
352 /* Flags that probably can be combined into dest_state */
353 uint8_t fast_retran_ip; /* fast retransmit in progress */
354 uint8_t hb_responded;
355 uint8_t saw_newack; /* CMT's SFR algorithm flag */
356 uint8_t src_addr_selected; /* if we split we move */
357 uint8_t indx_of_eligible_next_to_use;
358 uint8_t addr_is_local; /* its a local address (if known) could move
362 * CMT variables (iyengar@cis.udel.edu)
364 uint8_t find_pseudo_cumack; /* CMT CUC algorithm. Flag used to
365 * find a new pseudocumack. This flag
366 * is set after a new pseudo-cumack
367 * has been received and indicates
368 * that the sender should find the
369 * next pseudo-cumack expected for
370 * this destination */
371 uint8_t find_rtx_pseudo_cumack; /* CMT CUCv2 algorithm. Flag used to
372 * find a new rtx-pseudocumack. This
373 * flag is set after a new
374 * rtx-pseudo-cumack has been received
375 * and indicates that the sender
376 * should find the next
377 * rtx-pseudo-cumack expected for this
379 uint8_t new_pseudo_cumack; /* CMT CUC algorithm. Flag used to
380 * indicate if a new pseudo-cumack or
381 * rtx-pseudo-cumack has been received */
382 uint8_t window_probe; /* Doing a window probe? */
383 uint8_t RTO_measured; /* Have we done the first measure */
384 uint8_t last_hs_used; /* index into the last HS table entry we used */
392 struct sctp_data_chunkrec {
393 uint32_t tsn; /* the TSN of this transmit */
394 uint32_t mid; /* the message identifier of this transmit */
395 uint16_t sid; /* the stream number of this guy */
397 uint32_t context; /* from send */
398 uint32_t cwnd_at_send;
400 * part of the Highest sacked algorithm to be able to stroke counts
401 * on ones that are FR'd.
403 uint32_t fast_retran_tsn; /* sending_seq at the time of FR */
404 struct timeval timetodrop; /* time we drop it from queue */
405 uint32_t fsn; /* Fragment Sequence Number */
406 uint8_t doing_fast_retransmit;
407 uint8_t rcv_flags; /* flags pulled from data chunk on inbound for
408 * outbound holds sending flags for PR-SCTP. */
410 uint8_t chunk_was_revoked;
414 TAILQ_HEAD(sctpchunk_listhead, sctp_tmit_chunk);
416 /* The lower byte is used to enumerate PR_SCTP policies */
417 #define CHUNK_FLAGS_PR_SCTP_TTL SCTP_PR_SCTP_TTL
418 #define CHUNK_FLAGS_PR_SCTP_BUF SCTP_PR_SCTP_BUF
419 #define CHUNK_FLAGS_PR_SCTP_RTX SCTP_PR_SCTP_RTX
421 /* The upper byte is used as a bit mask */
422 #define CHUNK_FLAGS_FRAGMENT_OK 0x0100
426 uint8_t can_take_data;
430 struct sctp_tmit_chunk {
432 struct sctp_data_chunkrec data;
433 struct chk_id chunk_id;
435 struct sctp_association *asoc; /* bp to asoc this belongs to */
436 struct timeval sent_rcv_time; /* filled in if RTT being calculated */
437 struct mbuf *data; /* pointer to mbuf chain of data */
438 struct mbuf *last_mbuf; /* pointer to last mbuf in chain */
439 struct sctp_nets *whoTo;
440 TAILQ_ENTRY(sctp_tmit_chunk) sctp_next; /* next link */
441 int32_t sent; /* the send status */
442 uint16_t snd_count; /* number of times I sent */
443 uint16_t flags; /* flags, such as FRAGMENT_OK */
448 uint8_t holds_key_ref; /* flag if auth keyid refcount is held */
451 uint8_t book_size_scale;
452 uint8_t no_fr_allowed;
454 uint8_t window_probe;
457 struct sctp_queued_to_read { /* sinfo structure Pluse more */
458 uint16_t sinfo_stream; /* off the wire */
459 uint16_t sinfo_flags; /* SCTP_UNORDERED from wire use SCTP_EOF for
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 mid; /* Fragment Index */
469 uint32_t length; /* length of data */
470 uint32_t held_length; /* length held in sb */
471 uint32_t top_fsn; /* Highest FSN in queue */
472 uint32_t fsn_included; /* Highest FSN in *data portion */
473 struct sctp_nets *whoFrom; /* where it came from */
474 struct mbuf *data; /* front of the mbuf chain of data with
476 struct mbuf *tail_mbuf; /* used for multi-part data */
477 struct mbuf *aux_data; /* used to hold/cache control if o/s does not
479 struct sctp_tcb *stcb; /* assoc, used for window update */
480 TAILQ_ENTRY(sctp_queued_to_read) next;
481 TAILQ_ENTRY(sctp_queued_to_read) next_instrm;
482 struct sctpchunk_listhead reasm;
484 uint16_t spec_flags; /* Flags to hold the notification field */
485 uint8_t do_not_ref_stcb;
487 uint8_t pdapi_aborted;
488 uint8_t pdapi_started;
490 uint8_t last_frag_seen;
491 uint8_t first_frag_seen;
496 #define SCTP_ON_ORDERED 1
497 #define SCTP_ON_UNORDERED 2
499 /* This data structure will be on the outbound
500 * stream queues. Data will be pulled off from
501 * the front of the mbuf data and chunk-ified
502 * by the output routines. We will custom
503 * fit every chunk we pull to the send/sent
504 * queue to make up the next full packet
505 * if we can. An entry cannot be removed
506 * from the stream_out queue until
507 * the msg_is_complete flag is set. This
508 * means at times data/tail_mbuf MIGHT
509 * be NULL.. If that occurs it happens
510 * for one of two reasons. Either the user
511 * is blocked on a send() call and has not
512 * awoken to copy more data down... OR
513 * the user is in the explict MSG_EOR mode
514 * and wrote some data, but has not completed
517 struct sctp_stream_queue_pending {
519 struct mbuf *tail_mbuf;
521 struct sctp_nets *net;
522 TAILQ_ENTRY(sctp_stream_queue_pending) next;
523 TAILQ_ENTRY(sctp_stream_queue_pending) ss_next;
529 uint16_t sinfo_flags;
533 uint8_t holds_key_ref;
534 uint8_t msg_is_complete;
536 uint8_t sender_all_done;
537 uint8_t put_last_out;
538 uint8_t discard_rest;
542 * this struct contains info that is used to track inbound stream data and
543 * help with ordering.
545 TAILQ_HEAD(sctpwheelunrel_listhead, sctp_stream_in);
546 struct sctp_stream_in {
547 struct sctp_readhead inqueue;
548 struct sctp_readhead uno_inqueue;
549 uint32_t last_mid_delivered; /* used for re-order */
551 uint8_t delivery_started;
552 uint8_t pd_api_started;
555 TAILQ_HEAD(sctpwheel_listhead, sctp_stream_out);
556 TAILQ_HEAD(sctplist_listhead, sctp_stream_queue_pending);
559 /* Round-robin schedulers */
561 /* next link in wheel */
562 TAILQ_ENTRY(sctp_stream_out) next_spoke;
565 /* Priority scheduler */
567 /* next link in wheel */
568 TAILQ_ENTRY(sctp_stream_out) next_spoke;
573 /* Fair Bandwidth scheduler */
575 /* next link in wheel */
576 TAILQ_ENTRY(sctp_stream_out) next_spoke;
577 /* stores message size */
582 * This union holds all data necessary for
583 * different stream schedulers.
585 struct scheduling_data {
586 struct sctp_stream_out *locked_on_sending;
587 /* circular looking for output selection */
588 struct sctp_stream_out *last_out_stream;
590 struct sctpwheel_listhead wheel;
591 struct sctplist_listhead list;
596 * This union holds all parameters per stream
597 * necessary for different stream schedulers.
599 union scheduling_parameters {
605 /* States for outgoing streams */
606 #define SCTP_STREAM_CLOSED 0x00
607 #define SCTP_STREAM_OPENING 0x01
608 #define SCTP_STREAM_OPEN 0x02
609 #define SCTP_STREAM_RESET_PENDING 0x03
610 #define SCTP_STREAM_RESET_IN_FLIGHT 0x04
612 #define SCTP_MAX_STREAMS_AT_ONCE_RESET 200
614 /* This struct is used to track the traffic on outbound streams */
615 struct sctp_stream_out {
616 struct sctp_streamhead outqueue;
617 union scheduling_parameters ss_params;
618 uint32_t chunks_on_queues; /* send queue and sent queue */
619 #if defined(SCTP_DETAILED_STR_STATS)
620 uint32_t abandoned_unsent[SCTP_PR_SCTP_MAX + 1];
621 uint32_t abandoned_sent[SCTP_PR_SCTP_MAX + 1];
623 /* Only the aggregation */
624 uint32_t abandoned_unsent[1];
625 uint32_t abandoned_sent[1];
628 * For associations using DATA chunks, the lower 16-bit of
629 * next_mid_ordered are used as the next SSN.
631 uint32_t next_mid_ordered;
632 uint32_t next_mid_unordered;
634 uint8_t last_msg_incomplete;
638 /* used to keep track of the addresses yet to try to add/delete */
639 TAILQ_HEAD(sctp_asconf_addrhead, sctp_asconf_addr);
640 struct sctp_asconf_addr {
641 TAILQ_ENTRY(sctp_asconf_addr) next;
642 struct sctp_asconf_addr_param ap;
643 struct sctp_ifa *ifa; /* save the ifa for add/del ip */
644 uint8_t sent; /* has this been sent yet? */
645 uint8_t special_del; /* not to be used in lookup */
648 struct sctp_scoping {
649 uint8_t ipv4_addr_legal;
650 uint8_t ipv6_addr_legal;
651 uint8_t loopback_scope;
652 uint8_t ipv4_local_scope;
657 #define SCTP_TSN_LOG_SIZE 40
659 struct sctp_tsn_log {
671 #define SCTP_FS_SPEC_LOG_SIZE 200
672 struct sctp_fs_spec_log {
674 uint32_t total_flight;
681 /* This struct is here to cut out the compatiabilty
682 * pad that bulks up both the inp and stcb. The non
683 * pad portion MUST stay in complete sync with
684 * sctp_sndrcvinfo... i.e. if sinfo_xxxx is added
685 * this must be done here too.
687 struct sctp_nonpad_sndrcvinfo {
688 uint16_t sinfo_stream;
690 uint16_t sinfo_flags;
692 uint32_t sinfo_context;
693 uint32_t sinfo_timetolive;
695 uint32_t sinfo_cumtsn;
696 sctp_assoc_t sinfo_assoc_id;
697 uint16_t sinfo_keynumber;
698 uint16_t sinfo_keynumber_valid;
702 * JRS - Structure to hold function pointers to the functions responsible
703 * for congestion control.
706 struct sctp_cc_functions {
707 void (*sctp_set_initial_cc_param) (struct sctp_tcb *stcb, struct sctp_nets *net);
708 void (*sctp_cwnd_update_after_sack) (struct sctp_tcb *stcb,
709 struct sctp_association *asoc,
710 int accum_moved, int reneged_all, int will_exit);
711 void (*sctp_cwnd_update_exit_pf) (struct sctp_tcb *stcb, struct sctp_nets *net);
712 void (*sctp_cwnd_update_after_fr) (struct sctp_tcb *stcb,
713 struct sctp_association *asoc);
714 void (*sctp_cwnd_update_after_timeout) (struct sctp_tcb *stcb,
715 struct sctp_nets *net);
716 void (*sctp_cwnd_update_after_ecn_echo) (struct sctp_tcb *stcb,
717 struct sctp_nets *net, int in_window, int num_pkt_lost);
718 void (*sctp_cwnd_update_after_packet_dropped) (struct sctp_tcb *stcb,
719 struct sctp_nets *net, struct sctp_pktdrop_chunk *cp,
720 uint32_t *bottle_bw, uint32_t *on_queue);
721 void (*sctp_cwnd_update_after_output) (struct sctp_tcb *stcb,
722 struct sctp_nets *net, int burst_limit);
723 void (*sctp_cwnd_update_packet_transmitted) (struct sctp_tcb *stcb,
724 struct sctp_nets *net);
725 void (*sctp_cwnd_update_tsn_acknowledged) (struct sctp_nets *net,
726 struct sctp_tmit_chunk *);
727 void (*sctp_cwnd_new_transmission_begins) (struct sctp_tcb *stcb,
728 struct sctp_nets *net);
729 void (*sctp_cwnd_prepare_net_for_sack) (struct sctp_tcb *stcb,
730 struct sctp_nets *net);
731 int (*sctp_cwnd_socket_option) (struct sctp_tcb *stcb, int set, struct sctp_cc_option *);
732 void (*sctp_rtt_calculated) (struct sctp_tcb *, struct sctp_nets *, struct timeval *);
736 * RS - Structure to hold function pointers to the functions responsible
737 * for stream scheduling.
739 struct sctp_ss_functions {
740 void (*sctp_ss_init) (struct sctp_tcb *stcb, struct sctp_association *asoc,
742 void (*sctp_ss_clear) (struct sctp_tcb *stcb, struct sctp_association *asoc,
743 int clear_values, int holds_lock);
744 void (*sctp_ss_init_stream) (struct sctp_tcb *stcb, struct sctp_stream_out *strq, struct sctp_stream_out *with_strq);
745 void (*sctp_ss_add_to_stream) (struct sctp_tcb *stcb, struct sctp_association *asoc,
746 struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
747 int (*sctp_ss_is_empty) (struct sctp_tcb *stcb, struct sctp_association *asoc);
748 void (*sctp_ss_remove_from_stream) (struct sctp_tcb *stcb, struct sctp_association *asoc,
749 struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
750 struct sctp_stream_out *(*sctp_ss_select_stream) (struct sctp_tcb *stcb,
751 struct sctp_nets *net, struct sctp_association *asoc);
752 void (*sctp_ss_scheduled) (struct sctp_tcb *stcb, struct sctp_nets *net,
753 struct sctp_association *asoc, struct sctp_stream_out *strq, int moved_how_much);
754 void (*sctp_ss_packet_done) (struct sctp_tcb *stcb, struct sctp_nets *net,
755 struct sctp_association *asoc);
756 int (*sctp_ss_get_value) (struct sctp_tcb *stcb, struct sctp_association *asoc,
757 struct sctp_stream_out *strq, uint16_t *value);
758 int (*sctp_ss_set_value) (struct sctp_tcb *stcb, struct sctp_association *asoc,
759 struct sctp_stream_out *strq, uint16_t value);
760 int (*sctp_ss_is_user_msgs_incomplete) (struct sctp_tcb *stcb, struct sctp_association *asoc);
763 /* used to save ASCONF chunks for retransmission */
764 TAILQ_HEAD(sctp_asconf_head, sctp_asconf);
766 TAILQ_ENTRY(sctp_asconf) next;
767 uint32_t serial_number;
773 /* used to save ASCONF-ACK chunks for retransmission */
774 TAILQ_HEAD(sctp_asconf_ackhead, sctp_asconf_ack);
775 struct sctp_asconf_ack {
776 TAILQ_ENTRY(sctp_asconf_ack) next;
777 uint32_t serial_number;
778 struct sctp_nets *last_sent_to;
784 * Here we have information about each individual association that we track.
785 * We probably in production would be more dynamic. But for ease of
786 * implementation we will have a fixed array that we hunt for in a linear
789 struct sctp_association {
790 /* association state */
793 /* queue of pending addrs to add/delete */
794 struct sctp_asconf_addrhead asconf_queue;
796 struct timeval time_entered; /* time we entered state */
797 struct timeval time_last_rcvd;
798 struct timeval time_last_sent;
799 struct timeval time_last_sat_advance;
800 struct sctp_nonpad_sndrcvinfo def_send;
802 /* timers and such */
803 struct sctp_timer dack_timer; /* Delayed ack timer */
804 struct sctp_timer asconf_timer; /* asconf */
805 struct sctp_timer strreset_timer; /* stream reset */
806 struct sctp_timer shut_guard_timer; /* shutdown guard */
807 struct sctp_timer autoclose_timer; /* automatic close timer */
808 struct sctp_timer delayed_event_timer; /* timer for delayed events */
809 struct sctp_timer delete_prim_timer; /* deleting primary dst */
811 /* list of restricted local addresses */
812 struct sctpladdr sctp_restricted_addrs;
814 /* last local address pending deletion (waiting for an address add) */
815 struct sctp_ifa *asconf_addr_del_pending;
816 /* Deleted primary destination (used to stop timer) */
817 struct sctp_nets *deleted_primary;
819 struct sctpnetlisthead nets; /* remote address list */
821 /* Free chunk list */
822 struct sctpchunk_listhead free_chunks;
824 /* Control chunk queue */
825 struct sctpchunk_listhead control_send_queue;
827 /* ASCONF chunk queue */
828 struct sctpchunk_listhead asconf_send_queue;
831 * Once a TSN hits the wire it is moved to the sent_queue. We
832 * maintain two counts here (don't know if any but retran_cnt is
833 * needed). The idea is that the sent_queue_retran_cnt reflects how
834 * many chunks have been marked for retranmission by either T3-rxt
837 struct sctpchunk_listhead sent_queue;
838 struct sctpchunk_listhead send_queue;
840 /* Scheduling queues */
841 struct scheduling_data ss_data;
843 /* If an iterator is looking at me, this is it */
844 struct sctp_iterator *stcb_starting_point_for_iterator;
846 /* ASCONF save the last ASCONF-ACK so we can resend it if necessary */
847 struct sctp_asconf_ackhead asconf_ack_sent;
850 * pointer to last stream reset queued to control queue by us with
853 struct sctp_tmit_chunk *str_reset;
855 * if Source Address Selection happening, this will rotate through
858 struct sctp_laddr *last_used_address;
861 struct sctp_stream_in *strmin;
862 struct sctp_stream_out *strmout;
863 uint8_t *mapping_array;
864 /* primary destination to use */
865 struct sctp_nets *primary_destination;
866 struct sctp_nets *alternate; /* If primary is down or PF */
868 struct sctp_nets *last_net_cmt_send_started;
869 /* last place I got a data chunk from */
870 struct sctp_nets *last_data_chunk_from;
871 /* last place I got a control from */
872 struct sctp_nets *last_control_chunk_from;
876 * wait to the point the cum-ack passes req->send_reset_at_tsn for
877 * any req on the list.
879 struct sctp_resethead resetHead;
881 /* queue of chunks waiting to be sent into the local stack */
882 struct sctp_readhead pending_reply_queue;
884 /* JRS - the congestion control functions are in this struct */
885 struct sctp_cc_functions cc_functions;
887 * JRS - value to store the currently loaded congestion control
890 uint32_t congestion_control_module;
891 /* RS - the stream scheduling functions are in this struct */
892 struct sctp_ss_functions ss_functions;
893 /* RS - value to store the currently loaded stream scheduling module */
894 uint32_t stream_scheduling_module;
897 uint32_t cookie_preserve_req;
898 /* ASCONF next seq I am sending out, inits at init-tsn */
899 uint32_t asconf_seq_out;
900 uint32_t asconf_seq_out_acked;
901 /* ASCONF last received ASCONF from peer, starts at peer's TSN-1 */
902 uint32_t asconf_seq_in;
904 /* next seq I am sending in str reset messages */
905 uint32_t str_reset_seq_out;
906 /* next seq I am expecting in str reset messages */
907 uint32_t str_reset_seq_in;
909 /* various verification tag information */
910 uint32_t my_vtag; /* The tag to be used. if assoc is re-initited
911 * by remote end, and I have unlocked this
912 * will be regenerated to a new random value. */
913 uint32_t peer_vtag; /* The peers last tag */
915 uint32_t my_vtag_nonce;
916 uint32_t peer_vtag_nonce;
920 /* This is the SCTP fragmentation threshold */
921 uint32_t smallest_mtu;
924 * Special hook for Fast retransmit, allows us to track the highest
925 * TSN that is NEW in this SACK if gap ack blocks are present.
927 uint32_t this_sack_highest_gap;
930 * The highest consecutive TSN that has been acked by peer on my
933 uint32_t last_acked_seq;
935 /* The next TSN that I will use in sending. */
936 uint32_t sending_seq;
938 /* Original seq number I used ??questionable to keep?? */
939 uint32_t init_seq_number;
942 /* The Advanced Peer Ack Point, as required by the PR-SCTP */
943 /* (A1 in Section 4.2) */
944 uint32_t advanced_peer_ack_point;
947 * The highest consequetive TSN at the bottom of the mapping array
950 uint32_t cumulative_tsn;
952 * Used to track the mapping array and its offset bits. This MAY be
953 * lower then cumulative_tsn.
955 uint32_t mapping_array_base_tsn;
957 * used to track highest TSN we have received and is listed in the
960 uint32_t highest_tsn_inside_map;
962 /* EY - new NR variables used for nr_sack based on mapping_array */
963 uint8_t *nr_mapping_array;
964 uint32_t highest_tsn_inside_nr_map;
966 uint32_t fast_recovery_tsn;
967 uint32_t sat_t3_recovery_tsn;
968 uint32_t tsn_last_delivered;
970 * For the pd-api we should re-write this a bit more efficient. We
971 * could have multiple sctp_queued_to_read's that we are building at
972 * once. Now we only do this when we get ready to deliver to the
973 * socket buffer. Note that we depend on the fact that the struct is
974 * "stuck" on the read queue until we finish all the pd-api.
976 struct sctp_queued_to_read *control_pdapi;
978 uint32_t tsn_of_pdapi_last_delivered;
981 uint32_t last_reset_action[SCTP_MAX_RESET_PARAMS];
982 uint32_t last_sending_seq[SCTP_MAX_RESET_PARAMS];
983 uint32_t last_base_tsnsent[SCTP_MAX_RESET_PARAMS];
984 #ifdef SCTP_ASOCLOG_OF_TSNS
986 * special log - This adds considerable size to the asoc, but
987 * provides a log that you can use to detect problems via kgdb.
989 struct sctp_tsn_log in_tsnlog[SCTP_TSN_LOG_SIZE];
990 struct sctp_tsn_log out_tsnlog[SCTP_TSN_LOG_SIZE];
991 uint32_t cumack_log[SCTP_TSN_LOG_SIZE];
992 uint32_t cumack_logsnt[SCTP_TSN_LOG_SIZE];
995 uint16_t tsn_in_wrapped;
996 uint16_t tsn_out_wrapped;
997 uint16_t cumack_log_at;
998 uint16_t cumack_log_atsnt;
999 #endif /* SCTP_ASOCLOG_OF_TSNS */
1000 #ifdef SCTP_FS_SPEC_LOG
1001 struct sctp_fs_spec_log fslog[SCTP_FS_SPEC_LOG_SIZE];
1006 * window state information and smallest MTU that I use to bound
1009 uint32_t peers_rwnd;
1011 uint32_t my_last_reported_rwnd;
1012 uint32_t sctp_frag_point;
1014 uint32_t total_output_queue_size;
1016 uint32_t sb_cc; /* shadow of sb_cc */
1017 uint32_t sb_send_resv; /* amount reserved on a send */
1018 uint32_t my_rwnd_control_len; /* shadow of sb_mbcnt used for rwnd
1021 uint32_t default_flowlabel;
1023 uint32_t pr_sctp_cnt;
1024 int ctrl_queue_cnt; /* could be removed REM - NO IT CAN'T!! RRS */
1026 * All outbound datagrams queue into this list from the individual
1027 * stream queue. Here they get assigned a TSN and then await
1028 * sending. The stream seq comes when it is first put in the
1029 * individual str queue
1031 unsigned int stream_queue_cnt;
1032 unsigned int send_queue_cnt;
1033 unsigned int sent_queue_cnt;
1034 unsigned int sent_queue_cnt_removeable;
1036 * Number on sent queue that are marked for retran until this value
1037 * is 0 we only send one packet of retran'ed data.
1039 unsigned int sent_queue_retran_cnt;
1041 unsigned int size_on_reasm_queue;
1042 unsigned int cnt_on_reasm_queue;
1043 unsigned int fwd_tsn_cnt;
1044 /* amount of data (bytes) currently in flight (on all destinations) */
1045 unsigned int total_flight;
1046 /* Total book size in flight */
1047 unsigned int total_flight_count; /* count of chunks used with
1049 /* count of destinaton nets and list of destination nets */
1050 unsigned int numnets;
1052 /* Total error count on this association */
1053 unsigned int overall_error_count;
1055 unsigned int cnt_msg_on_sb;
1057 /* All stream count of chunks for delivery */
1058 unsigned int size_on_all_streams;
1059 unsigned int cnt_on_all_streams;
1061 /* Heart Beat delay in ms */
1062 uint32_t heart_beat_delay;
1065 unsigned int sctp_autoclose_ticks;
1067 /* how many preopen streams we have */
1068 unsigned int pre_open_streams;
1070 /* How many streams I support coming into me */
1071 unsigned int max_inbound_streams;
1073 /* the cookie life I award for any cookie, in seconds */
1074 unsigned int cookie_life;
1075 /* time to delay acks for */
1076 unsigned int delayed_ack;
1077 unsigned int old_delayed_ack;
1078 unsigned int sack_freq;
1079 unsigned int data_pkts_seen;
1081 unsigned int numduptsns;
1082 int dup_tsns[SCTP_MAX_DUP_TSNS];
1083 unsigned int initial_init_rto_max; /* initial RTO for INIT's */
1084 unsigned int initial_rto; /* initial send RTO */
1085 unsigned int minrto; /* per assoc RTO-MIN */
1086 unsigned int maxrto; /* per assoc RTO-MAX */
1088 /* authentication fields */
1089 sctp_auth_chklist_t *local_auth_chunks;
1090 sctp_auth_chklist_t *peer_auth_chunks;
1091 sctp_hmaclist_t *local_hmacs; /* local HMACs supported */
1092 sctp_hmaclist_t *peer_hmacs; /* peer HMACs supported */
1093 struct sctp_keyhead shared_keys; /* assoc's shared keys */
1094 sctp_authinfo_t authinfo; /* randoms, cached keys */
1096 * refcnt to block freeing when a sender or receiver is off coping
1100 uint32_t chunks_on_out_queue; /* total chunks floating around,
1101 * locked by send socket buffer */
1102 uint32_t peers_adaptation;
1103 uint32_t default_mtu;
1104 uint16_t peer_hmac_id; /* peer HMAC id to send */
1107 * Being that we have no bag to collect stale cookies, and that we
1108 * really would not want to anyway.. we will count them in this
1109 * counter. We of course feed them to the pigeons right away (I have
1110 * always thought of pigeons as flying rats).
1112 uint16_t stale_cookie_count;
1115 * For the partial delivery API, if up, invoked this is what last
1118 uint16_t str_of_pdapi;
1119 uint16_t ssn_of_pdapi;
1121 /* counts of actual built streams. Allocation may be more however */
1122 /* could re-arrange to optimize space here. */
1123 uint16_t streamincnt;
1124 uint16_t streamoutcnt;
1125 uint16_t strm_realoutsize;
1126 uint16_t strm_pending_add_size;
1127 /* my maximum number of retrans of INIT and SEND */
1128 /* copied from SCTP but should be individually setable */
1129 uint16_t max_init_times;
1130 uint16_t max_send_times;
1132 uint16_t def_net_failure;
1134 uint16_t def_net_pf_threshold;
1137 * lock flag: 0 is ok to send, 1+ (duals as a retran count) is
1140 uint16_t mapping_array_size;
1142 uint16_t last_strm_seq_delivered;
1143 uint16_t last_strm_no_delivered;
1145 uint16_t last_revoke_count;
1146 int16_t num_send_timers_up;
1148 uint16_t stream_locked_on;
1149 uint16_t ecn_echo_cnt_onq;
1151 uint16_t free_chunk_cnt;
1152 uint8_t stream_locked;
1153 uint8_t authenticated; /* packet authenticated ok */
1155 * This flag indicates that a SACK need to be sent. Initially this
1156 * is 1 to send the first sACK immediately.
1160 /* max burst of new packets into the network */
1162 /* max burst of fast retransmit packets */
1163 uint32_t fr_max_burst;
1165 uint8_t sat_network; /* RTT is in range of sat net or greater */
1166 uint8_t sat_network_lockout; /* lockout code */
1167 uint8_t burst_limit_applied; /* Burst limit in effect at last send? */
1168 /* flag goes on when we are doing a partial delivery api */
1169 uint8_t hb_random_values[4];
1170 uint8_t fragmented_delivery_inprogress;
1171 uint8_t fragment_flags;
1172 uint8_t last_flags_delivered;
1173 uint8_t hb_ect_randombit;
1174 uint8_t hb_random_idx;
1175 uint8_t default_dscp;
1176 uint8_t asconf_del_pending; /* asconf delete last addr pending */
1177 uint8_t trigger_reset;
1179 * This value, plus all other ack'd but above cum-ack is added
1180 * together to cross check against the bit that we have yet to
1181 * define (probably in the SACK). When the cum-ack is updated, this
1182 * sum is updated as well.
1185 /* Flags whether an extension is supported or not */
1186 uint8_t ecn_supported;
1187 uint8_t prsctp_supported;
1188 uint8_t auth_supported;
1189 uint8_t asconf_supported;
1190 uint8_t reconfig_supported;
1191 uint8_t nrsack_supported;
1192 uint8_t pktdrop_supported;
1193 uint8_t idata_supported;
1195 /* Did the peer make the stream config (add out) request */
1196 uint8_t peer_req_out;
1198 uint8_t local_strreset_support;
1199 uint8_t peer_supports_nat;
1201 struct sctp_scoping scope;
1202 /* flags to handle send alternate net tracking */
1203 uint8_t used_alt_asconfack;
1204 uint8_t fast_retran_loss_recovery;
1205 uint8_t sat_t3_loss_recovery;
1206 uint8_t dropped_special_cnt;
1207 uint8_t seen_a_sack_this_pkt;
1208 uint8_t stream_reset_outstanding;
1209 uint8_t stream_reset_out_is_outstanding;
1210 uint8_t delayed_connection;
1211 uint8_t ifp_had_enobuf;
1212 uint8_t saw_sack_with_frags;
1213 uint8_t saw_sack_with_nr_frags;
1214 uint8_t in_asocid_hash;
1215 uint8_t assoc_up_sent;
1216 uint8_t adaptation_needed;
1217 uint8_t adaptation_sent;
1219 uint8_t cmt_dac_pkts_rcvd;
1220 uint8_t sctp_cmt_on_off;
1221 uint8_t iam_blocking;
1222 uint8_t cookie_how[8];
1223 /* JRS 5/21/07 - CMT PF variable */
1224 uint8_t sctp_cmt_pf;
1225 uint8_t use_precise_time;
1226 uint64_t sctp_features;
1228 uint16_t port; /* remote UDP encapsulation port */
1230 * The mapping array is used to track out of order sequences above
1231 * last_acked_seq. 0 indicates packet missing 1 indicates packet
1232 * rec'd. We slide it up every time we raise last_acked_seq and 0
1233 * trailing locactions out. If I get a TSN above the array
1234 * mappingArraySz, I discard the datagram and let retransmit happen.
1236 uint32_t marked_retrans;
1240 uint32_t timoshutdown;
1241 uint32_t timoheartbeat;
1242 uint32_t timocookie;
1243 uint32_t timoshutdownack;
1244 struct timeval start_time;
1245 struct timeval discontinuity_time;
1246 uint64_t abandoned_unsent[SCTP_PR_SCTP_MAX + 1];
1247 uint64_t abandoned_sent[SCTP_PR_SCTP_MAX + 1];