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31 /* $KAME: sctp_structs.h,v 1.13 2005/03/06 16:04:18 itojun Exp $ */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #ifndef __sctp_structs_h__
37 #define __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 struct sctp_stream_reset_out_request req;
84 TAILQ_HEAD(sctp_resethead, sctp_stream_reset_list);
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);
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.
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.
100 #define SCTP_PCB_ANY_FLAGS 0x00000000
101 #define SCTP_PCB_ANY_FEATURES 0x00000000
102 #define SCTP_ASOC_ANY_STATE 0x00000000
104 typedef void (*asoc_func) (struct sctp_inpcb *, struct sctp_tcb *, void *ptr,
106 typedef int (*inp_func) (struct sctp_inpcb *, void *ptr, uint32_t val);
107 typedef void (*end_func) (void *ptr, uint32_t val);
109 struct sctp_iterator {
110 TAILQ_ENTRY(sctp_iterator) sctp_nxt_itr;
112 struct sctp_timer tmr;
113 struct sctp_inpcb *inp; /* current endpoint */
114 struct sctp_tcb *stcb; /* current* assoc */
115 struct sctp_inpcb *next_inp; /* special hook to skip to */
116 asoc_func function_assoc; /* per assoc function */
117 inp_func function_inp; /* per endpoint function */
118 inp_func function_inp_end; /* end INP function */
119 end_func function_atend;/* iterator completion function */
120 void *pointer; /* pointer for apply func to use */
121 uint32_t val; /* value for apply func to use */
122 uint32_t pcb_flags; /* endpoint flags being checked */
123 uint32_t pcb_features; /* endpoint features being checked */
124 uint32_t asoc_state; /* assoc state being checked */
125 uint32_t iterator_flags;
126 uint8_t no_chunk_output;
127 uint8_t done_current_ep;
130 /* iterator_flags values */
131 #define SCTP_ITERATOR_DO_ALL_INP 0x00000001
132 #define SCTP_ITERATOR_DO_SINGLE_INP 0x00000002
135 TAILQ_HEAD(sctpiterators, sctp_iterator);
137 struct sctp_copy_all {
138 struct sctp_inpcb *inp; /* ep */
140 struct sctp_sndrcvinfo sndrcv;
146 struct sctp_asconf_iterator {
147 struct sctpladdr list_of_work;
151 struct iterator_control {
152 struct mtx ipi_iterator_wq_mtx;
154 SCTP_PROCESS_STRUCT thread_proc;
155 struct sctpiterators iteratorhead;
156 struct sctp_iterator *cur_it;
157 uint32_t iterator_running;
158 uint32_t iterator_flags;
161 #define SCTP_ITERATOR_MUST_EXIT 0x00000001
162 #define SCTP_ITERATOR_STOP_CUR_IT 0x00000002
163 #define SCTP_ITERATOR_STOP_CUR_INP 0x00000004
165 struct sctp_net_route {
166 sctp_rtentry_t *ro_rt;
168 union sctp_sockstore _l_addr; /* remote peer addr */
169 struct sctp_ifa *_s_addr; /* our selected src addr */
173 uint16_t alpha; /* Fixed point arith, << 7 */
174 uint8_t beta; /* Fixed point arith, << 7 */
175 uint8_t modeswitch; /* Delay modeswitch until we had at least one
176 * congestion event */
177 uint32_t last_cong; /* Time since last congestion event end */
178 uint32_t undo_last_cong;
179 uint16_t bytes_acked;
184 uint32_t undo_maxRTT;
185 uint32_t undo_old_maxB;
187 /* Bandwidth estimation */
197 TAILQ_ENTRY(sctp_nets) sctp_next; /* next link */
200 * Things on the top half may be able to be split into a common
201 * structure shared by all.
203 struct sctp_timer pmtu_timer;
206 * The following two in combination equate to a route entry for v6
209 struct sctp_net_route ro;
211 /* mtu discovered so far */
213 uint32_t ssthresh; /* not sure about this one for split */
214 uint32_t last_cwr_tsn;
215 uint32_t cwr_window_tsn;
216 uint32_t ecn_ce_pkt_cnt;
218 /* smoothed average things for RTT and RTO itself */
221 int rtt; /* last measured rtt value in ms */
224 /* This is used for SHUTDOWN/SHUTDOWN-ACK/SEND or INIT timers */
225 struct sctp_timer rxt_timer;
226 struct sctp_timer fr_timer; /* for early fr */
228 /* last time in seconds I sent to it */
229 struct timeval last_sent_time;
232 /* Congestion stats per destination */
234 * flight size variables and such, sorry Vern, I could not avoid
235 * this if I wanted performance :>
237 uint32_t flight_size;
238 uint32_t cwnd; /* actual cwnd */
239 uint32_t prev_cwnd; /* cwnd before any processing */
240 uint32_t partial_bytes_acked; /* in CA tracks when to incr a MTU */
242 /* tracking variables to avoid the aloc/free in sack processing */
243 unsigned int net_ack;
244 unsigned int net_ack2;
247 * JRS - 5/8/07 - Variable to track last time a destination was
250 uint32_t last_active;
253 * CMT variables (iyengar@cis.udel.edu)
255 uint32_t this_sack_highest_newack; /* tracks highest TSN newly
256 * acked for a given dest in
257 * the current SACK. Used in
258 * SFR and HTNA algos */
259 uint32_t pseudo_cumack; /* CMT CUC algorithm. Maintains next expected
260 * pseudo-cumack for this destination */
261 uint32_t rtx_pseudo_cumack; /* CMT CUC algorithm. Maintains next
262 * expected pseudo-cumack for this
265 /* CMT fast recovery variables */
266 uint32_t fast_recovery_tsn;
267 uint32_t heartbeat_random1;
268 uint32_t heartbeat_random2;
269 uint32_t tos_flowlabel;
271 struct timeval start_time; /* time when this net was created */
272 struct timeval last_measured_rtt;
273 uint32_t marked_retrans;/* number or DATA chunks marked for timer
274 * based retransmissions */
275 uint32_t marked_fastretrans;
277 /* if this guy is ok or not ... status */
279 /* number of transmit failures to down this guy */
280 uint16_t failure_threshold;
281 /* error stats on destination */
282 uint16_t error_count;
283 /* UDP port number in case of UDP tunneling */
286 uint8_t fast_retran_loss_recovery;
287 uint8_t will_exit_fast_recovery;
288 /* Flags that probably can be combined into dest_state */
289 uint8_t fast_retran_ip; /* fast retransmit in progress */
290 uint8_t hb_responded;
291 uint8_t saw_newack; /* CMT's SFR algorithm flag */
292 uint8_t src_addr_selected; /* if we split we move */
293 uint8_t indx_of_eligible_next_to_use;
294 uint8_t addr_is_local; /* its a local address (if known) could move
298 * CMT variables (iyengar@cis.udel.edu)
300 uint8_t find_pseudo_cumack; /* CMT CUC algorithm. Flag used to
301 * find a new pseudocumack. This flag
302 * is set after a new pseudo-cumack
303 * has been received and indicates
304 * that the sender should find the
305 * next pseudo-cumack expected for
306 * this destination */
307 uint8_t find_rtx_pseudo_cumack; /* CMT CUCv2 algorithm. Flag used to
308 * find a new rtx-pseudocumack. This
309 * flag is set after a new
310 * rtx-pseudo-cumack has been received
311 * and indicates that the sender
312 * should find the next
313 * rtx-pseudo-cumack expected for this
315 uint8_t new_pseudo_cumack; /* CMT CUC algorithm. Flag used to
316 * indicate if a new pseudo-cumack or
317 * rtx-pseudo-cumack has been received */
318 uint8_t window_probe; /* Doing a window probe? */
319 uint8_t RTO_measured; /* Have we done the first measure */
320 uint8_t last_hs_used; /* index into the last HS table entry we used */
321 /* JRS - struct used in HTCP algorithm */
326 struct sctp_data_chunkrec {
327 uint32_t TSN_seq; /* the TSN of this transmit */
328 uint16_t stream_seq; /* the stream sequence number of this transmit */
329 uint16_t stream_number; /* the stream number of this guy */
330 uint32_t payloadtype;
331 uint32_t context; /* from send */
335 * part of the Highest sacked algorithm to be able to stroke counts
336 * on ones that are FR'd.
338 uint32_t fast_retran_tsn; /* sending_seq at the time of FR */
339 struct timeval timetodrop; /* time we drop it from queue */
340 uint8_t doing_fast_retransmit;
341 uint8_t rcv_flags; /* flags pulled from data chunk on inbound for
342 * outbound holds sending flags for PR-SCTP. */
344 uint8_t chunk_was_revoked;
347 TAILQ_HEAD(sctpchunk_listhead, sctp_tmit_chunk);
349 /* The lower byte is used to enumerate PR_SCTP policies */
350 #define CHUNK_FLAGS_PR_SCTP_TTL SCTP_PR_SCTP_TTL
351 #define CHUNK_FLAGS_PR_SCTP_BUF SCTP_PR_SCTP_BUF
352 #define CHUNK_FLAGS_PR_SCTP_RTX SCTP_PR_SCTP_RTX
354 /* The upper byte is used a a bit mask */
355 #define CHUNK_FLAGS_FRAGMENT_OK 0x0100
359 uint16_t can_take_data;
363 struct sctp_tmit_chunk {
365 struct sctp_data_chunkrec data;
366 struct chk_id chunk_id;
368 struct sctp_association *asoc; /* bp to asoc this belongs to */
369 struct timeval sent_rcv_time; /* filled in if RTT being calculated */
370 struct mbuf *data; /* pointer to mbuf chain of data */
371 struct mbuf *last_mbuf; /* pointer to last mbuf in chain */
372 struct sctp_nets *whoTo;
373 TAILQ_ENTRY(sctp_tmit_chunk) sctp_next; /* next link */
374 int32_t sent; /* the send status */
375 uint16_t snd_count; /* number of times I sent */
376 uint16_t flags; /* flags, such as FRAGMENT_OK */
381 uint8_t holds_key_ref; /* flag if auth keyid refcount is held */
384 uint8_t book_size_scale;
385 uint8_t no_fr_allowed;
388 uint8_t window_probe;
392 * The first part of this structure MUST be the entire sinfo structure. Maybe
393 * I should have made it a sub structure... we can circle back later and do
396 struct sctp_queued_to_read { /* sinfo structure Pluse more */
397 uint16_t sinfo_stream; /* off the wire */
398 uint16_t sinfo_ssn; /* off the wire */
399 uint16_t sinfo_flags; /* SCTP_UNORDERED from wire use SCTP_EOF for
401 uint32_t sinfo_ppid; /* off the wire */
402 uint32_t sinfo_context; /* pick this up from assoc def context? */
403 uint32_t sinfo_timetolive; /* not used by kernel */
404 uint32_t sinfo_tsn; /* Use this in reassembly as first TSN */
405 uint32_t sinfo_cumtsn; /* Use this in reassembly as last TSN */
406 sctp_assoc_t sinfo_assoc_id; /* our assoc id */
407 /* Non sinfo stuff */
408 uint32_t length; /* length of data */
409 uint32_t held_length; /* length held in sb */
410 struct sctp_nets *whoFrom; /* where it came from */
411 struct mbuf *data; /* front of the mbuf chain of data with
413 struct mbuf *tail_mbuf; /* used for multi-part data */
414 struct mbuf *aux_data; /* used to hold/cache control if o/s does not
416 struct sctp_tcb *stcb; /* assoc, used for window update */
417 TAILQ_ENTRY(sctp_queued_to_read) next;
419 uint16_t spec_flags; /* Flags to hold the notification field */
420 uint8_t do_not_ref_stcb;
422 uint8_t pdapi_aborted;
426 /* This data structure will be on the outbound
427 * stream queues. Data will be pulled off from
428 * the front of the mbuf data and chunk-ified
429 * by the output routines. We will custom
430 * fit every chunk we pull to the send/sent
431 * queue to make up the next full packet
432 * if we can. An entry cannot be removed
433 * from the stream_out queue until
434 * the msg_is_complete flag is set. This
435 * means at times data/tail_mbuf MIGHT
436 * be NULL.. If that occurs it happens
437 * for one of two reasons. Either the user
438 * is blocked on a send() call and has not
439 * awoken to copy more data down... OR
440 * the user is in the explict MSG_EOR mode
441 * and wrote some data, but has not completed
444 struct sctp_stream_queue_pending {
446 struct mbuf *tail_mbuf;
448 struct sctp_nets *net;
449 TAILQ_ENTRY(sctp_stream_queue_pending) next;
454 uint16_t sinfo_flags;
459 uint8_t holds_key_ref;
460 uint8_t msg_is_complete;
463 uint8_t sender_all_done;
464 uint8_t put_last_out;
465 uint8_t discard_rest;
469 * this struct contains info that is used to track inbound stream data and
470 * help with ordering.
472 TAILQ_HEAD(sctpwheelunrel_listhead, sctp_stream_in);
473 struct sctp_stream_in {
474 struct sctp_readhead inqueue;
476 uint16_t last_sequence_delivered; /* used for re-order */
477 uint8_t delivery_started;
480 TAILQ_HEAD(sctpwheel_listhead, sctp_stream_out);
481 TAILQ_HEAD(sctplist_listhead, sctp_stream_queue_pending);
483 /* Round-robin schedulers */
485 /* next link in wheel */
486 TAILQ_ENTRY(sctp_stream_out) next_spoke;
489 /* Priority scheduler */
491 /* next link in wheel */
492 TAILQ_ENTRY(sctp_stream_out) next_spoke;
497 /* Fair Bandwidth scheduler */
499 /* next link in wheel */
500 TAILQ_ENTRY(sctp_stream_out) next_spoke;
501 /* stores message size */
506 * This union holds all data necessary for
507 * different stream schedulers.
509 union scheduling_data {
510 struct sctpwheel_listhead out_wheel;
511 struct sctplist_listhead out_list;
515 * This union holds all parameters per stream
516 * necessary for different stream schedulers.
518 union scheduling_parameters {
524 /* This struct is used to track the traffic on outbound streams */
525 struct sctp_stream_out {
526 struct sctp_streamhead outqueue;
527 union scheduling_parameters ss_params;
529 uint16_t next_sequence_sent; /* next one I expect to send out */
530 uint8_t last_msg_incomplete;
533 /* used to keep track of the addresses yet to try to add/delete */
534 TAILQ_HEAD(sctp_asconf_addrhead, sctp_asconf_addr);
535 struct sctp_asconf_addr {
536 TAILQ_ENTRY(sctp_asconf_addr) next;
537 struct sctp_asconf_addr_param ap;
538 struct sctp_ifa *ifa; /* save the ifa for add/del ip */
539 uint8_t sent; /* has this been sent yet? */
540 uint8_t special_del; /* not to be used in lookup */
543 struct sctp_scoping {
544 uint8_t ipv4_addr_legal;
545 uint8_t ipv6_addr_legal;
546 uint8_t loopback_scope;
547 uint8_t ipv4_local_scope;
552 #define SCTP_TSN_LOG_SIZE 40
554 struct sctp_tsn_log {
565 #define SCTP_FS_SPEC_LOG_SIZE 200
566 struct sctp_fs_spec_log {
568 uint32_t total_flight;
575 /* This struct is here to cut out the compatiabilty
576 * pad that bulks up both the inp and stcb. The non
577 * pad portion MUST stay in complete sync with
578 * sctp_sndrcvinfo... i.e. if sinfo_xxxx is added
579 * this must be done here too.
581 struct sctp_nonpad_sndrcvinfo {
582 uint16_t sinfo_stream;
584 uint16_t sinfo_flags;
586 uint32_t sinfo_context;
587 uint32_t sinfo_timetolive;
589 uint32_t sinfo_cumtsn;
590 sctp_assoc_t sinfo_assoc_id;
594 * JRS - Structure to hold function pointers to the functions responsible
595 * for congestion control.
598 struct sctp_cc_functions {
599 void (*sctp_set_initial_cc_param) (struct sctp_tcb *stcb, struct sctp_nets *net);
600 void (*sctp_cwnd_update_after_sack) (struct sctp_tcb *stcb,
601 struct sctp_association *asoc,
602 int accum_moved, int reneged_all, int will_exit);
603 void (*sctp_cwnd_update_after_fr) (struct sctp_tcb *stcb,
604 struct sctp_association *asoc);
605 void (*sctp_cwnd_update_after_timeout) (struct sctp_tcb *stcb,
606 struct sctp_nets *net);
607 void (*sctp_cwnd_update_after_ecn_echo) (struct sctp_tcb *stcb,
608 struct sctp_nets *net, int in_window, int num_pkt_lost);
609 void (*sctp_cwnd_update_after_packet_dropped) (struct sctp_tcb *stcb,
610 struct sctp_nets *net, struct sctp_pktdrop_chunk *cp,
611 uint32_t * bottle_bw, uint32_t * on_queue);
612 void (*sctp_cwnd_update_after_output) (struct sctp_tcb *stcb,
613 struct sctp_nets *net, int burst_limit);
614 void (*sctp_cwnd_update_after_fr_timer) (struct sctp_inpcb *inp,
615 struct sctp_tcb *stcb, struct sctp_nets *net);
619 * RS - Structure to hold function pointers to the functions responsible
620 * for stream scheduling.
622 struct sctp_ss_functions {
623 void (*sctp_ss_init) (struct sctp_tcb *stcb, struct sctp_association *asoc,
625 void (*sctp_ss_clear) (struct sctp_tcb *stcb, struct sctp_association *asoc,
626 int clear_values, int holds_lock);
627 void (*sctp_ss_init_stream) (struct sctp_stream_out *strq);
628 void (*sctp_ss_add_to_stream) (struct sctp_tcb *stcb, struct sctp_association *asoc,
629 struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
630 int (*sctp_ss_is_empty) (struct sctp_tcb *stcb, struct sctp_association *asoc);
631 void (*sctp_ss_remove_from_stream) (struct sctp_tcb *stcb, struct sctp_association *asoc,
632 struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
633 struct sctp_stream_out *(*sctp_ss_select_stream) (struct sctp_tcb *stcb,
634 struct sctp_nets *net, struct sctp_association *asoc);
635 void (*sctp_ss_scheduled) (struct sctp_tcb *stcb, struct sctp_nets *net,
636 struct sctp_association *asoc, struct sctp_stream_out *strq, int moved_how_much);
637 void (*sctp_ss_packet_done) (struct sctp_tcb *stcb, struct sctp_nets *net,
638 struct sctp_association *asoc);
639 int (*sctp_ss_get_value) (struct sctp_tcb *stcb, struct sctp_association *asoc,
640 struct sctp_stream_out *strq, uint16_t * value);
641 int (*sctp_ss_set_value) (struct sctp_tcb *stcb, struct sctp_association *asoc,
642 struct sctp_stream_out *strq, uint16_t value);
645 /* used to save ASCONF chunks for retransmission */
646 TAILQ_HEAD(sctp_asconf_head, sctp_asconf);
648 TAILQ_ENTRY(sctp_asconf) next;
649 uint32_t serial_number;
655 /* used to save ASCONF-ACK chunks for retransmission */
656 TAILQ_HEAD(sctp_asconf_ackhead, sctp_asconf_ack);
657 struct sctp_asconf_ack {
658 TAILQ_ENTRY(sctp_asconf_ack) next;
659 uint32_t serial_number;
660 struct sctp_nets *last_sent_to;
666 * Here we have information about each individual association that we track.
667 * We probably in production would be more dynamic. But for ease of
668 * implementation we will have a fixed array that we hunt for in a linear
671 struct sctp_association {
672 /* association state */
675 /* queue of pending addrs to add/delete */
676 struct sctp_asconf_addrhead asconf_queue;
678 struct timeval time_entered; /* time we entered state */
679 struct timeval time_last_rcvd;
680 struct timeval time_last_sent;
681 struct timeval time_last_sat_advance;
682 struct sctp_nonpad_sndrcvinfo def_send;
684 /* timers and such */
685 struct sctp_timer hb_timer; /* hb timer */
686 struct sctp_timer dack_timer; /* Delayed ack timer */
687 struct sctp_timer asconf_timer; /* asconf */
688 struct sctp_timer strreset_timer; /* stream reset */
689 struct sctp_timer shut_guard_timer; /* shutdown guard */
690 struct sctp_timer autoclose_timer; /* automatic close timer */
691 struct sctp_timer delayed_event_timer; /* timer for delayed events */
692 struct sctp_timer delete_prim_timer; /* deleting primary dst */
694 /* list of restricted local addresses */
695 struct sctpladdr sctp_restricted_addrs;
697 /* last local address pending deletion (waiting for an address add) */
698 struct sctp_ifa *asconf_addr_del_pending;
699 /* Deleted primary destination (used to stop timer) */
700 struct sctp_nets *deleted_primary;
702 struct sctpnetlisthead nets; /* remote address list */
704 /* Free chunk list */
705 struct sctpchunk_listhead free_chunks;
707 /* Control chunk queue */
708 struct sctpchunk_listhead control_send_queue;
710 /* ASCONF chunk queue */
711 struct sctpchunk_listhead asconf_send_queue;
714 * Once a TSN hits the wire it is moved to the sent_queue. We
715 * maintain two counts here (don't know if any but retran_cnt is
716 * needed). The idea is that the sent_queue_retran_cnt reflects how
717 * many chunks have been marked for retranmission by either T3-rxt
720 struct sctpchunk_listhead sent_queue;
721 struct sctpchunk_listhead send_queue;
723 /* re-assembly queue for fragmented chunks on the inbound path */
724 struct sctpchunk_listhead reasmqueue;
727 * this queue is used when we reach a condition that we can NOT put
728 * data into the socket buffer. We track the size of this queue and
729 * set our rwnd to the space in the socket minus also the
730 * size_on_delivery_queue.
732 union scheduling_data ss_data;
735 * This pointer will be set to NULL most of the time. But when we
736 * have a fragmented message, where we could not get out all of the
737 * message at the last send then this will point to the stream to go
740 struct sctp_stream_out *locked_on_sending;
742 /* If an iterator is looking at me, this is it */
743 struct sctp_iterator *stcb_starting_point_for_iterator;
745 /* ASCONF save the last ASCONF-ACK so we can resend it if necessary */
746 struct sctp_asconf_ackhead asconf_ack_sent;
749 * pointer to last stream reset queued to control queue by us with
752 struct sctp_tmit_chunk *str_reset;
754 * if Source Address Selection happening, this will rotate through
757 struct sctp_laddr *last_used_address;
760 struct sctp_stream_in *strmin;
761 struct sctp_stream_out *strmout;
762 uint8_t *mapping_array;
763 /* primary destination to use */
764 struct sctp_nets *primary_destination;
766 struct sctp_nets *last_net_cmt_send_started;
767 /* last place I got a data chunk from */
768 struct sctp_nets *last_data_chunk_from;
769 /* last place I got a control from */
770 struct sctp_nets *last_control_chunk_from;
772 /* circular looking for output selection */
773 struct sctp_stream_out *last_out_stream;
776 * wait to the point the cum-ack passes req->send_reset_at_tsn for
777 * any req on the list.
779 struct sctp_resethead resetHead;
781 /* queue of chunks waiting to be sent into the local stack */
782 struct sctp_readhead pending_reply_queue;
784 /* JRS - the congestion control functions are in this struct */
785 struct sctp_cc_functions cc_functions;
787 * JRS - value to store the currently loaded congestion control
790 uint32_t congestion_control_module;
791 /* RS - the stream scheduling functions are in this struct */
792 struct sctp_ss_functions ss_functions;
793 /* RS - value to store the currently loaded stream scheduling module */
794 uint32_t stream_scheduling_module;
798 uint32_t cookie_preserve_req;
799 /* ASCONF next seq I am sending out, inits at init-tsn */
800 uint32_t asconf_seq_out;
801 uint32_t asconf_seq_out_acked;
802 /* ASCONF last received ASCONF from peer, starts at peer's TSN-1 */
803 uint32_t asconf_seq_in;
805 /* next seq I am sending in str reset messages */
806 uint32_t str_reset_seq_out;
807 /* next seq I am expecting in str reset messages */
808 uint32_t str_reset_seq_in;
810 /* various verification tag information */
811 uint32_t my_vtag; /* The tag to be used. if assoc is re-initited
812 * by remote end, and I have unlocked this
813 * will be regenerated to a new random value. */
814 uint32_t peer_vtag; /* The peers last tag */
816 uint32_t my_vtag_nonce;
817 uint32_t peer_vtag_nonce;
821 /* This is the SCTP fragmentation threshold */
822 uint32_t smallest_mtu;
825 * Special hook for Fast retransmit, allows us to track the highest
826 * TSN that is NEW in this SACK if gap ack blocks are present.
828 uint32_t this_sack_highest_gap;
831 * The highest consecutive TSN that has been acked by peer on my
834 uint32_t last_acked_seq;
836 /* The next TSN that I will use in sending. */
837 uint32_t sending_seq;
839 /* Original seq number I used ??questionable to keep?? */
840 uint32_t init_seq_number;
843 /* The Advanced Peer Ack Point, as required by the PR-SCTP */
844 /* (A1 in Section 4.2) */
845 uint32_t advanced_peer_ack_point;
848 * The highest consequetive TSN at the bottom of the mapping array
851 uint32_t cumulative_tsn;
853 * Used to track the mapping array and its offset bits. This MAY be
854 * lower then cumulative_tsn.
856 uint32_t mapping_array_base_tsn;
858 * used to track highest TSN we have received and is listed in the
861 uint32_t highest_tsn_inside_map;
863 /* EY - new NR variables used for nr_sack based on mapping_array */
864 uint8_t *nr_mapping_array;
865 uint32_t highest_tsn_inside_nr_map;
867 uint32_t fast_recovery_tsn;
868 uint32_t sat_t3_recovery_tsn;
869 uint32_t tsn_last_delivered;
871 * For the pd-api we should re-write this a bit more efficent. We
872 * could have multiple sctp_queued_to_read's that we are building at
873 * once. Now we only do this when we get ready to deliver to the
874 * socket buffer. Note that we depend on the fact that the struct is
875 * "stuck" on the read queue until we finish all the pd-api.
877 struct sctp_queued_to_read *control_pdapi;
879 uint32_t tsn_of_pdapi_last_delivered;
882 uint32_t last_reset_action[SCTP_MAX_RESET_PARAMS];
883 uint32_t last_sending_seq[SCTP_MAX_RESET_PARAMS];
884 uint32_t last_base_tsnsent[SCTP_MAX_RESET_PARAMS];
885 #ifdef SCTP_ASOCLOG_OF_TSNS
887 * special log - This adds considerable size to the asoc, but
888 * provides a log that you can use to detect problems via kgdb.
890 struct sctp_tsn_log in_tsnlog[SCTP_TSN_LOG_SIZE];
891 struct sctp_tsn_log out_tsnlog[SCTP_TSN_LOG_SIZE];
892 uint32_t cumack_log[SCTP_TSN_LOG_SIZE];
893 uint32_t cumack_logsnt[SCTP_TSN_LOG_SIZE];
896 uint16_t tsn_in_wrapped;
897 uint16_t tsn_out_wrapped;
898 uint16_t cumack_log_at;
899 uint16_t cumack_log_atsnt;
900 #endif /* SCTP_ASOCLOG_OF_TSNS */
901 #ifdef SCTP_FS_SPEC_LOG
902 struct sctp_fs_spec_log fslog[SCTP_FS_SPEC_LOG_SIZE];
907 * window state information and smallest MTU that I use to bound
912 uint32_t my_last_reported_rwnd;
913 uint32_t sctp_frag_point;
915 uint32_t total_output_queue_size;
917 uint32_t sb_cc; /* shadow of sb_cc */
918 uint32_t sb_send_resv; /* amount reserved on a send */
919 uint32_t my_rwnd_control_len; /* shadow of sb_mbcnt used for rwnd
921 uint32_t default_flowlabel;
922 uint32_t pr_sctp_cnt;
923 int ctrl_queue_cnt; /* could be removed REM - NO IT CAN'T!! RRS */
925 * All outbound datagrams queue into this list from the individual
926 * stream queue. Here they get assigned a TSN and then await
927 * sending. The stream seq comes when it is first put in the
928 * individual str queue
930 unsigned int stream_queue_cnt;
931 unsigned int send_queue_cnt;
932 unsigned int sent_queue_cnt;
933 unsigned int sent_queue_cnt_removeable;
935 * Number on sent queue that are marked for retran until this value
936 * is 0 we only send one packet of retran'ed data.
938 unsigned int sent_queue_retran_cnt;
940 unsigned int size_on_reasm_queue;
941 unsigned int cnt_on_reasm_queue;
942 unsigned int fwd_tsn_cnt;
943 /* amount of data (bytes) currently in flight (on all destinations) */
944 unsigned int total_flight;
945 /* Total book size in flight */
946 unsigned int total_flight_count; /* count of chunks used with
948 /* count of destinaton nets and list of destination nets */
949 unsigned int numnets;
951 /* Total error count on this association */
952 unsigned int overall_error_count;
954 unsigned int cnt_msg_on_sb;
956 /* All stream count of chunks for delivery */
957 unsigned int size_on_all_streams;
958 unsigned int cnt_on_all_streams;
960 /* Heart Beat delay in ticks */
961 unsigned int heart_beat_delay;
964 unsigned int sctp_autoclose_ticks;
966 /* how many preopen streams we have */
967 unsigned int pre_open_streams;
969 /* How many streams I support coming into me */
970 unsigned int max_inbound_streams;
972 /* the cookie life I award for any cookie, in seconds */
973 unsigned int cookie_life;
974 /* time to delay acks for */
975 unsigned int delayed_ack;
976 unsigned int old_delayed_ack;
977 unsigned int sack_freq;
978 unsigned int data_pkts_seen;
980 unsigned int numduptsns;
981 int dup_tsns[SCTP_MAX_DUP_TSNS];
982 unsigned int initial_init_rto_max; /* initial RTO for INIT's */
983 unsigned int initial_rto; /* initial send RTO */
984 unsigned int minrto; /* per assoc RTO-MIN */
985 unsigned int maxrto; /* per assoc RTO-MAX */
987 /* authentication fields */
988 sctp_auth_chklist_t *local_auth_chunks;
989 sctp_auth_chklist_t *peer_auth_chunks;
990 sctp_hmaclist_t *local_hmacs; /* local HMACs supported */
991 sctp_hmaclist_t *peer_hmacs; /* peer HMACs supported */
992 struct sctp_keyhead shared_keys; /* assoc's shared keys */
993 sctp_authinfo_t authinfo; /* randoms, cached keys */
995 * refcnt to block freeing when a sender or receiver is off coping
999 uint32_t chunks_on_out_queue; /* total chunks floating around,
1000 * locked by send socket buffer */
1001 uint32_t peers_adaptation;
1002 uint16_t peer_hmac_id; /* peer HMAC id to send */
1005 * Being that we have no bag to collect stale cookies, and that we
1006 * really would not want to anyway.. we will count them in this
1007 * counter. We of course feed them to the pigeons right away (I have
1008 * always thought of pigeons as flying rats).
1010 uint16_t stale_cookie_count;
1013 * For the partial delivery API, if up, invoked this is what last
1016 uint16_t str_of_pdapi;
1017 uint16_t ssn_of_pdapi;
1019 /* counts of actual built streams. Allocation may be more however */
1020 /* could re-arrange to optimize space here. */
1021 uint16_t streamincnt;
1022 uint16_t streamoutcnt;
1023 uint16_t strm_realoutsize;
1024 /* my maximum number of retrans of INIT and SEND */
1025 /* copied from SCTP but should be individually setable */
1026 uint16_t max_init_times;
1027 uint16_t max_send_times;
1029 uint16_t def_net_failure;
1032 * lock flag: 0 is ok to send, 1+ (duals as a retran count) is
1035 uint16_t mapping_array_size;
1037 uint16_t last_strm_seq_delivered;
1038 uint16_t last_strm_no_delivered;
1040 uint16_t last_revoke_count;
1041 int16_t num_send_timers_up;
1043 uint16_t stream_locked_on;
1044 uint16_t ecn_echo_cnt_onq;
1046 uint16_t free_chunk_cnt;
1047 uint8_t stream_locked;
1048 uint8_t authenticated; /* packet authenticated ok */
1050 * This flag indicates that a SACK need to be sent. Initially this
1051 * is 1 to send the first sACK immediately.
1055 /* max burst after fast retransmit completes */
1058 uint8_t sat_network; /* RTT is in range of sat net or greater */
1059 uint8_t sat_network_lockout; /* lockout code */
1060 uint8_t burst_limit_applied; /* Burst limit in effect at last send? */
1061 /* flag goes on when we are doing a partial delivery api */
1062 uint8_t hb_random_values[4];
1063 uint8_t fragmented_delivery_inprogress;
1064 uint8_t fragment_flags;
1065 uint8_t last_flags_delivered;
1066 uint8_t hb_ect_randombit;
1067 uint8_t hb_random_idx;
1068 uint8_t hb_is_disabled; /* is the hb disabled? */
1069 uint8_t default_tos;
1070 uint8_t asconf_del_pending; /* asconf delete last addr pending */
1073 * This value, plus all other ack'd but above cum-ack is added
1074 * together to cross check against the bit that we have yet to
1075 * define (probably in the SACK). When the cum-ack is updated, this
1076 * sum is updated as well.
1079 /* Flag to tell if ECN is allowed */
1080 uint8_t ecn_allowed;
1082 /* flag to indicate if peer can do asconf */
1083 uint8_t peer_supports_asconf;
1084 /* EY - flag to indicate if peer can do nr_sack */
1085 uint8_t peer_supports_nr_sack;
1086 /* pr-sctp support flag */
1087 uint8_t peer_supports_prsctp;
1088 /* peer authentication support flag */
1089 uint8_t peer_supports_auth;
1090 /* stream resets are supported by the peer */
1091 uint8_t peer_supports_strreset;
1093 uint8_t peer_supports_nat;
1095 * packet drop's are supported by the peer, we don't really care
1096 * about this but we bookkeep it anyway.
1098 uint8_t peer_supports_pktdrop;
1100 /* Do we allow V6/V4? */
1101 uint8_t ipv4_addr_legal;
1102 uint8_t ipv6_addr_legal;
1103 /* Address scoping flags */
1104 /* scope value for IPv4 */
1105 uint8_t ipv4_local_scope;
1106 /* scope values for IPv6 */
1107 uint8_t local_scope;
1109 /* loopback scope */
1110 uint8_t loopback_scope;
1111 /* flags to handle send alternate net tracking */
1112 uint8_t used_alt_onsack;
1113 uint8_t used_alt_asconfack;
1114 uint8_t fast_retran_loss_recovery;
1115 uint8_t sat_t3_loss_recovery;
1116 uint8_t dropped_special_cnt;
1117 uint8_t seen_a_sack_this_pkt;
1118 uint8_t stream_reset_outstanding;
1119 uint8_t stream_reset_out_is_outstanding;
1120 uint8_t delayed_connection;
1121 uint8_t ifp_had_enobuf;
1122 uint8_t saw_sack_with_frags;
1123 uint8_t saw_sack_with_nr_frags;
1124 uint8_t in_asocid_hash;
1125 uint8_t assoc_up_sent;
1126 uint8_t adaptation_needed;
1127 uint8_t adaptation_sent;
1129 uint8_t cmt_dac_pkts_rcvd;
1130 uint8_t sctp_cmt_on_off;
1131 uint8_t iam_blocking;
1132 uint8_t cookie_how[8];
1133 /* EY 05/05/08 - NR_SACK variable */
1134 uint8_t sctp_nr_sack_on_off;
1135 /* JRS 5/21/07 - CMT PF variable */
1136 uint8_t sctp_cmt_pf;
1138 * The mapping array is used to track out of order sequences above
1139 * last_acked_seq. 0 indicates packet missing 1 indicates packet
1140 * rec'd. We slide it up every time we raise last_acked_seq and 0
1141 * trailing locactions out. If I get a TSN above the array
1142 * mappingArraySz, I discard the datagram and let retransmit happen.
1144 uint32_t marked_retrans;
1148 uint32_t timoshutdown;
1149 uint32_t timoheartbeat;
1150 uint32_t timocookie;
1151 uint32_t timoshutdownack;
1152 struct timeval start_time;
1153 struct timeval discontinuity_time;