The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_structs.h

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    1 /*-
    2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are met:
    8  *
    9  * a) Redistributions of source code must retain the above copyright notice,
   10  *    this list of conditions and the following disclaimer.
   11  *
   12  * b) Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in
   14  *    the documentation and/or other materials provided with the distribution.
   15  *
   16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   17  *    contributors may be used to endorse or promote products derived
   18  *    from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/11.1/sys/netinet/sctp_structs.h 310773 2016-12-29 11:32:42Z tuexen $");
   35 
   36 #ifndef _NETINET_SCTP_STRUCTS_H_
   37 #define _NETINET_SCTP_STRUCTS_H_
   38 
   39 #include <netinet/sctp_os.h>
   40 #include <netinet/sctp_header.h>
   41 #include <netinet/sctp_auth.h>
   42 
   43 struct sctp_timer {
   44         sctp_os_timer_t timer;
   45 
   46         int type;
   47         /*
   48          * Depending on the timer type these will be setup and cast with the
   49          * appropriate entity.
   50          */
   51         void *ep;
   52         void *tcb;
   53         void *net;
   54         void *vnet;
   55 
   56         /* for sanity checking */
   57         void *self;
   58         uint32_t ticks;
   59         uint32_t stopped_from;
   60 };
   61 
   62 
   63 struct sctp_foo_stuff {
   64         struct sctp_inpcb *inp;
   65         uint32_t lineno;
   66         uint32_t ticks;
   67         int updown;
   68 };
   69 
   70 
   71 /*
   72  * This is the information we track on each interface that we know about from
   73  * the distant end.
   74  */
   75 TAILQ_HEAD(sctpnetlisthead, sctp_nets);
   76 
   77 struct sctp_stream_reset_list {
   78         TAILQ_ENTRY(sctp_stream_reset_list) next_resp;
   79         uint32_t seq;
   80         uint32_t tsn;
   81         uint32_t number_entries;
   82         uint16_t list_of_streams[];
   83 };
   84 
   85 TAILQ_HEAD(sctp_resethead, sctp_stream_reset_list);
   86 
   87 /*
   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);
   91  *
   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.
   94  *
   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.
  100  */
  101 #define SCTP_PCB_ANY_FLAGS      0x00000000
  102 #define SCTP_PCB_ANY_FEATURES   0x00000000
  103 #define SCTP_ASOC_ANY_STATE     0x00000000
  104 
  105 typedef void (*asoc_func) (struct sctp_inpcb *, struct sctp_tcb *, void *ptr,
  106          uint32_t val);
  107 typedef int (*inp_func) (struct sctp_inpcb *, void *ptr, uint32_t val);
  108 typedef void (*end_func) (void *ptr, uint32_t val);
  109 
  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;
  114         struct vnet *vn;
  115         struct mbuf *m;
  116         int off;
  117         int v6;
  118 };
  119 
  120 TAILQ_HEAD(sctp_mcore_qhead, sctp_mcore_queue);
  121 
  122 struct sctp_mcore_ctrl {
  123         SCTP_PROCESS_STRUCT thread_proc;
  124         struct sctp_mcore_qhead que;
  125         struct mtx core_mtx;
  126         struct mtx que_mtx;
  127         int running;
  128         int cpuid;
  129 };
  130 
  131 
  132 #endif
  133 
  134 
  135 struct sctp_iterator {
  136         TAILQ_ENTRY(sctp_iterator) sctp_nxt_itr;
  137         struct vnet *vn;
  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;
  154 };
  155 
  156 /* iterator_flags values */
  157 #define SCTP_ITERATOR_DO_ALL_INP        0x00000001
  158 #define SCTP_ITERATOR_DO_SINGLE_INP     0x00000002
  159 
  160 
  161 TAILQ_HEAD(sctpiterators, sctp_iterator);
  162 
  163 struct sctp_copy_all {
  164         struct sctp_inpcb *inp; /* ep */
  165         struct mbuf *m;
  166         struct sctp_sndrcvinfo sndrcv;
  167         int sndlen;
  168         int cnt_sent;
  169         int cnt_failed;
  170 };
  171 
  172 struct sctp_asconf_iterator {
  173         struct sctpladdr list_of_work;
  174         int cnt;
  175 };
  176 
  177 struct iterator_control {
  178         struct mtx ipi_iterator_wq_mtx;
  179         struct mtx it_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;
  185 };
  186 #define SCTP_ITERATOR_STOP_CUR_IT       0x00000004
  187 #define SCTP_ITERATOR_STOP_CUR_INP      0x00000008
  188 
  189 struct sctp_net_route {
  190         sctp_rtentry_t *ro_rt;
  191         struct llentry *ro_lle;
  192         char *ro_prepend;
  193         uint16_t ro_plen;
  194         uint16_t ro_flags;
  195         uint16_t ro_mtu;
  196         uint16_t spare;
  197         union sctp_sockstore _l_addr;   /* remote peer addr */
  198         struct sctp_ifa *_s_addr;       /* our selected src addr */
  199 };
  200 
  201 struct htcp {
  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;
  209         uint32_t bytecount;
  210         uint32_t minRTT;
  211         uint32_t maxRTT;
  212 
  213         uint32_t undo_maxRTT;
  214         uint32_t undo_old_maxB;
  215 
  216         /* Bandwidth estimation */
  217         uint32_t minB;
  218         uint32_t maxB;
  219         uint32_t old_maxB;
  220         uint32_t Bi;
  221         uint32_t lasttime;
  222 };
  223 
  224 struct rtcc_cc {
  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
  243                                          * on it */
  244         uint8_t last_inst_ind;  /* Last saved inst indication */
  245 };
  246 
  247 
  248 struct sctp_nets {
  249         TAILQ_ENTRY(sctp_nets) sctp_next;       /* next link */
  250 
  251         /*
  252          * Things on the top half may be able to be split into a common
  253          * structure shared by all.
  254          */
  255         struct sctp_timer pmtu_timer;
  256         struct sctp_timer hb_timer;
  257 
  258         /*
  259          * The following two in combination equate to a route entry for v6
  260          * or v4.
  261          */
  262         struct sctp_net_route ro;
  263 
  264         /* mtu discovered so far */
  265         uint32_t mtu;
  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;
  270         uint32_t lost_cnt;
  271         /* smoothed average things for RTT and RTO itself */
  272         int lastsa;
  273         int lastsv;
  274         uint64_t rtt;           /* last measured rtt value in us */
  275         unsigned int RTO;
  276 
  277         /* This is used for SHUTDOWN/SHUTDOWN-ACK/SEND or INIT timers */
  278         struct sctp_timer rxt_timer;
  279 
  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  */
  285         }               cc_mod;
  286         int ref_count;
  287 
  288         /* Congestion stats per destination */
  289         /*
  290          * flight size variables and such, sorry Vern, I could not avoid
  291          * this if I wanted performance :>
  292          */
  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
  297                                  * window */
  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;
  302 
  303         /*
  304          * JRS - 5/8/07 - Variable to track last time a destination was
  305          * active for CMT PF
  306          */
  307         uint32_t last_active;
  308 
  309         /*
  310          * CMT variables (iyengar@cis.udel.edu)
  311          */
  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
  320                                          * destination */
  321 
  322         /* CMT fast recovery variables */
  323         uint32_t fast_recovery_tsn;
  324         uint32_t heartbeat_random1;
  325         uint32_t heartbeat_random2;
  326 #ifdef INET6
  327         uint32_t flowlabel;
  328 #endif
  329         uint8_t dscp;
  330 
  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 */
  336 
  337         /* if this guy is ok or not ... status */
  338         uint16_t dest_state;
  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 */
  346         uint16_t port;
  347 
  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
  357                                  * in split */
  358 
  359         /*
  360          * CMT variables (iyengar@cis.udel.edu)
  361          */
  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
  376                                          * destination */
  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 */
  383         uint8_t lan_type;
  384         uint8_t rto_needed;
  385         uint32_t flowid;
  386         uint8_t flowtype;
  387 };
  388 
  389 
  390 struct sctp_data_chunkrec {
  391         uint32_t tsn;           /* the TSN of this transmit */
  392         uint32_t mid;           /* the message identifier of this transmit */
  393         uint16_t sid;           /* the stream number of this guy */
  394         uint32_t ppid;
  395         uint32_t context;       /* from send */
  396         uint32_t cwnd_at_send;
  397         /*
  398          * part of the Highest sacked algorithm to be able to stroke counts
  399          * on ones that are FR'd.
  400          */
  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;           /* 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. */
  407         uint8_t state_flags;
  408         uint8_t chunk_was_revoked;
  409         uint8_t fwd_tsn_cnt;
  410 };
  411 
  412 TAILQ_HEAD(sctpchunk_listhead, sctp_tmit_chunk);
  413 
  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
  418 
  419 /* The upper byte is used as a bit mask */
  420 #define CHUNK_FLAGS_FRAGMENT_OK         0x0100
  421 
  422 struct chk_id {
  423         uint8_t id;
  424         uint8_t can_take_data;
  425 };
  426 
  427 
  428 struct sctp_tmit_chunk {
  429         union {
  430                 struct sctp_data_chunkrec data;
  431                 struct chk_id chunk_id;
  432         }     rec;
  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 */
  442         uint16_t send_size;
  443         uint16_t book_size;
  444         uint16_t mbcnt;
  445         uint16_t auth_keyid;
  446         uint8_t holds_key_ref;  /* flag if auth keyid refcount is held */
  447         uint8_t pad_inplace;
  448         uint8_t do_rtt;
  449         uint8_t book_size_scale;
  450         uint8_t no_fr_allowed;
  451         uint8_t copy_by_ref;
  452         uint8_t window_probe;
  453 };
  454 
  455 struct sctp_queued_to_read {    /* sinfo structure Pluse more */
  456         uint16_t sinfo_stream;  /* off the wire */
  457         uint16_t sinfo_flags;   /* SCTP_UNORDERED from wire use SCTP_EOF for
  458                                  * EOR */
  459         uint32_t sinfo_ppid;    /* off the wire */
  460         uint32_t sinfo_context; /* pick this up from assoc def context? */
  461         uint32_t sinfo_timetolive;      /* not used by kernel */
  462         uint32_t sinfo_tsn;     /* Use this in reassembly as first TSN */
  463         uint32_t sinfo_cumtsn;  /* Use this in reassembly as last TSN */
  464         sctp_assoc_t sinfo_assoc_id;    /* our assoc id */
  465         /* Non sinfo stuff */
  466         uint32_t mid;           /* Fragment Index */
  467         uint32_t length;        /* length of data */
  468         uint32_t held_length;   /* length held in sb */
  469         uint32_t top_fsn;       /* Highest FSN in queue */
  470         uint32_t fsn_included;  /* Highest FSN in *data portion */
  471         struct sctp_nets *whoFrom;      /* where it came from */
  472         struct mbuf *data;      /* front of the mbuf chain of data with
  473                                  * PKT_HDR */
  474         struct mbuf *tail_mbuf; /* used for multi-part data */
  475         struct mbuf *aux_data;  /* used to hold/cache  control if o/s does not
  476                                  * take it from us */
  477         struct sctp_tcb *stcb;  /* assoc, used for window update */
  478                  TAILQ_ENTRY(sctp_queued_to_read) next;
  479                  TAILQ_ENTRY(sctp_queued_to_read) next_instrm;
  480         struct sctpchunk_listhead reasm;
  481         uint16_t port_from;
  482         uint16_t spec_flags;    /* Flags to hold the notification field */
  483         uint8_t do_not_ref_stcb;
  484         uint8_t end_added;
  485         uint8_t pdapi_aborted;
  486         uint8_t pdapi_started;
  487         uint8_t some_taken;
  488         uint8_t last_frag_seen;
  489         uint8_t first_frag_seen;
  490         uint8_t on_read_q;
  491         uint8_t on_strm_q;
  492 };
  493 
  494 #define SCTP_ON_ORDERED 1
  495 #define SCTP_ON_UNORDERED 2
  496 
  497 /* This data structure will be on the outbound
  498  * stream queues. Data will be pulled off from
  499  * the front of the mbuf data and chunk-ified
  500  * by the output routines. We will custom
  501  * fit every chunk we pull to the send/sent
  502  * queue to make up the next full packet
  503  * if we can. An entry cannot be removed
  504  * from the stream_out queue until
  505  * the msg_is_complete flag is set. This
  506  * means at times data/tail_mbuf MIGHT
  507  * be NULL.. If that occurs it happens
  508  * for one of two reasons. Either the user
  509  * is blocked on a send() call and has not
  510  * awoken to copy more data down... OR
  511  * the user is in the explict MSG_EOR mode
  512  * and wrote some data, but has not completed
  513  * sending.
  514  */
  515 struct sctp_stream_queue_pending {
  516         struct mbuf *data;
  517         struct mbuf *tail_mbuf;
  518         struct timeval ts;
  519         struct sctp_nets *net;
  520                   TAILQ_ENTRY(sctp_stream_queue_pending) next;
  521                   TAILQ_ENTRY(sctp_stream_queue_pending) ss_next;
  522         uint32_t fsn;
  523         uint32_t length;
  524         uint32_t timetolive;
  525         uint32_t ppid;
  526         uint32_t context;
  527         uint16_t sinfo_flags;
  528         uint16_t sid;
  529         uint16_t act_flags;
  530         uint16_t auth_keyid;
  531         uint8_t holds_key_ref;
  532         uint8_t msg_is_complete;
  533         uint8_t some_taken;
  534         uint8_t sender_all_done;
  535         uint8_t put_last_out;
  536         uint8_t discard_rest;
  537 };
  538 
  539 /*
  540  * this struct contains info that is used to track inbound stream data and
  541  * help with ordering.
  542  */
  543 TAILQ_HEAD(sctpwheelunrel_listhead, sctp_stream_in);
  544 struct sctp_stream_in {
  545         struct sctp_readhead inqueue;
  546         struct sctp_readhead uno_inqueue;
  547         uint32_t last_mid_delivered;    /* used for re-order */
  548         uint16_t sid;
  549         uint8_t delivery_started;
  550         uint8_t pd_api_started;
  551 };
  552 
  553 TAILQ_HEAD(sctpwheel_listhead, sctp_stream_out);
  554 TAILQ_HEAD(sctplist_listhead, sctp_stream_queue_pending);
  555 
  556 
  557 /* Round-robin schedulers */
  558 struct ss_rr {
  559         /* next link in wheel */
  560         TAILQ_ENTRY(sctp_stream_out) next_spoke;
  561 };
  562 
  563 /* Priority scheduler */
  564 struct ss_prio {
  565         /* next link in wheel */
  566         TAILQ_ENTRY(sctp_stream_out) next_spoke;
  567         /* priority id */
  568         uint16_t priority;
  569 };
  570 
  571 /* Fair Bandwidth scheduler */
  572 struct ss_fb {
  573         /* next link in wheel */
  574         TAILQ_ENTRY(sctp_stream_out) next_spoke;
  575         /* stores message size */
  576         int32_t rounds;
  577 };
  578 
  579 /*
  580  * This union holds all data necessary for
  581  * different stream schedulers.
  582  */
  583 struct scheduling_data {
  584         struct sctp_stream_out *locked_on_sending;
  585         /* circular looking for output selection */
  586         struct sctp_stream_out *last_out_stream;
  587         union {
  588                 struct sctpwheel_listhead wheel;
  589                 struct sctplist_listhead list;
  590         }     out;
  591 };
  592 
  593 /*
  594  * This union holds all parameters per stream
  595  * necessary for different stream schedulers.
  596  */
  597 union scheduling_parameters {
  598         struct ss_rr rr;
  599         struct ss_prio prio;
  600         struct ss_fb fb;
  601 };
  602 
  603 /* States for outgoing streams */
  604 #define SCTP_STREAM_CLOSED           0x00
  605 #define SCTP_STREAM_OPENING          0x01
  606 #define SCTP_STREAM_OPEN             0x02
  607 #define SCTP_STREAM_RESET_PENDING    0x03
  608 #define SCTP_STREAM_RESET_IN_FLIGHT  0x04
  609 
  610 #define SCTP_MAX_STREAMS_AT_ONCE_RESET 200
  611 
  612 /* This struct is used to track the traffic on outbound streams */
  613 struct sctp_stream_out {
  614         struct sctp_streamhead outqueue;
  615         union scheduling_parameters ss_params;
  616         uint32_t chunks_on_queues;      /* send queue and sent queue */
  617 #if defined(SCTP_DETAILED_STR_STATS)
  618         uint32_t abandoned_unsent[SCTP_PR_SCTP_MAX + 1];
  619         uint32_t abandoned_sent[SCTP_PR_SCTP_MAX + 1];
  620 #else
  621         /* Only the aggregation */
  622         uint32_t abandoned_unsent[1];
  623         uint32_t abandoned_sent[1];
  624 #endif
  625         /*
  626          * For associations using DATA chunks, the lower 16-bit of
  627          * next_mid_ordered are used as the next SSN.
  628          */
  629         uint32_t next_mid_ordered;
  630         uint32_t next_mid_unordered;
  631         uint16_t sid;
  632         uint8_t last_msg_incomplete;
  633         uint8_t state;
  634 };
  635 
  636 /* used to keep track of the addresses yet to try to add/delete */
  637 TAILQ_HEAD(sctp_asconf_addrhead, sctp_asconf_addr);
  638 struct sctp_asconf_addr {
  639         TAILQ_ENTRY(sctp_asconf_addr) next;
  640         struct sctp_asconf_addr_param ap;
  641         struct sctp_ifa *ifa;   /* save the ifa for add/del ip */
  642         uint8_t sent;           /* has this been sent yet? */
  643         uint8_t special_del;    /* not to be used in lookup */
  644 };
  645 
  646 struct sctp_scoping {
  647         uint8_t ipv4_addr_legal;
  648         uint8_t ipv6_addr_legal;
  649         uint8_t loopback_scope;
  650         uint8_t ipv4_local_scope;
  651         uint8_t local_scope;
  652         uint8_t site_scope;
  653 };
  654 
  655 #define SCTP_TSN_LOG_SIZE 40
  656 
  657 struct sctp_tsn_log {
  658         void *stcb;
  659         uint32_t tsn;
  660         uint32_t seq;
  661         uint16_t strm;
  662         uint16_t sz;
  663         uint16_t flgs;
  664         uint16_t in_pos;
  665         uint16_t in_out;
  666         uint16_t resv;
  667 };
  668 
  669 #define SCTP_FS_SPEC_LOG_SIZE 200
  670 struct sctp_fs_spec_log {
  671         uint32_t sent;
  672         uint32_t total_flight;
  673         uint32_t tsn;
  674         uint16_t book;
  675         uint8_t incr;
  676         uint8_t decr;
  677 };
  678 
  679 /* This struct is here to cut out the compatiabilty
  680  * pad that bulks up both the inp and stcb. The non
  681  * pad portion MUST stay in complete sync with
  682  * sctp_sndrcvinfo... i.e. if sinfo_xxxx is added
  683  * this must be done here too.
  684  */
  685 struct sctp_nonpad_sndrcvinfo {
  686         uint16_t sinfo_stream;
  687         uint16_t sinfo_ssn;
  688         uint16_t sinfo_flags;
  689         uint32_t sinfo_ppid;
  690         uint32_t sinfo_context;
  691         uint32_t sinfo_timetolive;
  692         uint32_t sinfo_tsn;
  693         uint32_t sinfo_cumtsn;
  694         sctp_assoc_t sinfo_assoc_id;
  695         uint16_t sinfo_keynumber;
  696         uint16_t sinfo_keynumber_valid;
  697 };
  698 
  699 /*
  700  * JRS - Structure to hold function pointers to the functions responsible
  701  * for congestion control.
  702  */
  703 
  704 struct sctp_cc_functions {
  705         void (*sctp_set_initial_cc_param) (struct sctp_tcb *stcb, struct sctp_nets *net);
  706         void (*sctp_cwnd_update_after_sack) (struct sctp_tcb *stcb,
  707                  struct sctp_association *asoc,
  708                  int accum_moved, int reneged_all, int will_exit);
  709         void (*sctp_cwnd_update_exit_pf) (struct sctp_tcb *stcb, struct sctp_nets *net);
  710         void (*sctp_cwnd_update_after_fr) (struct sctp_tcb *stcb,
  711                  struct sctp_association *asoc);
  712         void (*sctp_cwnd_update_after_timeout) (struct sctp_tcb *stcb,
  713                  struct sctp_nets *net);
  714         void (*sctp_cwnd_update_after_ecn_echo) (struct sctp_tcb *stcb,
  715                  struct sctp_nets *net, int in_window, int num_pkt_lost);
  716         void (*sctp_cwnd_update_after_packet_dropped) (struct sctp_tcb *stcb,
  717                  struct sctp_nets *net, struct sctp_pktdrop_chunk *cp,
  718                  uint32_t *bottle_bw, uint32_t *on_queue);
  719         void (*sctp_cwnd_update_after_output) (struct sctp_tcb *stcb,
  720                  struct sctp_nets *net, int burst_limit);
  721         void (*sctp_cwnd_update_packet_transmitted) (struct sctp_tcb *stcb,
  722                  struct sctp_nets *net);
  723         void (*sctp_cwnd_update_tsn_acknowledged) (struct sctp_nets *net,
  724                  struct sctp_tmit_chunk *);
  725         void (*sctp_cwnd_new_transmission_begins) (struct sctp_tcb *stcb,
  726                  struct sctp_nets *net);
  727         void (*sctp_cwnd_prepare_net_for_sack) (struct sctp_tcb *stcb,
  728                  struct sctp_nets *net);
  729         int (*sctp_cwnd_socket_option) (struct sctp_tcb *stcb, int set, struct sctp_cc_option *);
  730         void (*sctp_rtt_calculated) (struct sctp_tcb *, struct sctp_nets *, struct timeval *);
  731 };
  732 
  733 /*
  734  * RS - Structure to hold function pointers to the functions responsible
  735  * for stream scheduling.
  736  */
  737 struct sctp_ss_functions {
  738         void (*sctp_ss_init) (struct sctp_tcb *stcb, struct sctp_association *asoc,
  739                  int holds_lock);
  740         void (*sctp_ss_clear) (struct sctp_tcb *stcb, struct sctp_association *asoc,
  741                  int clear_values, int holds_lock);
  742         void (*sctp_ss_init_stream) (struct sctp_tcb *stcb, struct sctp_stream_out *strq, struct sctp_stream_out *with_strq);
  743         void (*sctp_ss_add_to_stream) (struct sctp_tcb *stcb, struct sctp_association *asoc,
  744                  struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
  745         int (*sctp_ss_is_empty) (struct sctp_tcb *stcb, struct sctp_association *asoc);
  746         void (*sctp_ss_remove_from_stream) (struct sctp_tcb *stcb, struct sctp_association *asoc,
  747                  struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
  748         struct sctp_stream_out *(*sctp_ss_select_stream) (struct sctp_tcb *stcb,
  749                             struct sctp_nets *net, struct sctp_association *asoc);
  750         void (*sctp_ss_scheduled) (struct sctp_tcb *stcb, struct sctp_nets *net,
  751                  struct sctp_association *asoc, struct sctp_stream_out *strq, int moved_how_much);
  752         void (*sctp_ss_packet_done) (struct sctp_tcb *stcb, struct sctp_nets *net,
  753                  struct sctp_association *asoc);
  754         int (*sctp_ss_get_value) (struct sctp_tcb *stcb, struct sctp_association *asoc,
  755                 struct sctp_stream_out *strq, uint16_t *value);
  756         int (*sctp_ss_set_value) (struct sctp_tcb *stcb, struct sctp_association *asoc,
  757                 struct sctp_stream_out *strq, uint16_t value);
  758         int (*sctp_ss_is_user_msgs_incomplete) (struct sctp_tcb *stcb, struct sctp_association *asoc);
  759 };
  760 
  761 /* used to save ASCONF chunks for retransmission */
  762 TAILQ_HEAD(sctp_asconf_head, sctp_asconf);
  763 struct sctp_asconf {
  764         TAILQ_ENTRY(sctp_asconf) next;
  765         uint32_t serial_number;
  766         uint16_t snd_count;
  767         struct mbuf *data;
  768         uint16_t len;
  769 };
  770 
  771 /* used to save ASCONF-ACK chunks for retransmission */
  772 TAILQ_HEAD(sctp_asconf_ackhead, sctp_asconf_ack);
  773 struct sctp_asconf_ack {
  774         TAILQ_ENTRY(sctp_asconf_ack) next;
  775         uint32_t serial_number;
  776         struct sctp_nets *last_sent_to;
  777         struct mbuf *data;
  778         uint16_t len;
  779 };
  780 
  781 /*
  782  * Here we have information about each individual association that we track.
  783  * We probably in production would be more dynamic. But for ease of
  784  * implementation we will have a fixed array that we hunt for in a linear
  785  * fashion.
  786  */
  787 struct sctp_association {
  788         /* association state */
  789         int state;
  790 
  791         /* queue of pending addrs to add/delete */
  792         struct sctp_asconf_addrhead asconf_queue;
  793 
  794         struct timeval time_entered;    /* time we entered state */
  795         struct timeval time_last_rcvd;
  796         struct timeval time_last_sent;
  797         struct timeval time_last_sat_advance;
  798         struct sctp_nonpad_sndrcvinfo def_send;
  799 
  800         /* timers and such */
  801         struct sctp_timer dack_timer;   /* Delayed ack timer */
  802         struct sctp_timer asconf_timer; /* asconf */
  803         struct sctp_timer strreset_timer;       /* stream reset */
  804         struct sctp_timer shut_guard_timer;     /* shutdown guard */
  805         struct sctp_timer autoclose_timer;      /* automatic close timer */
  806         struct sctp_timer delayed_event_timer;  /* timer for delayed events */
  807         struct sctp_timer delete_prim_timer;    /* deleting primary dst */
  808 
  809         /* list of restricted local addresses */
  810         struct sctpladdr sctp_restricted_addrs;
  811 
  812         /* last local address pending deletion (waiting for an address add) */
  813         struct sctp_ifa *asconf_addr_del_pending;
  814         /* Deleted primary destination (used to stop timer) */
  815         struct sctp_nets *deleted_primary;
  816 
  817         struct sctpnetlisthead nets;    /* remote address list */
  818 
  819         /* Free chunk list */
  820         struct sctpchunk_listhead free_chunks;
  821 
  822         /* Control chunk queue */
  823         struct sctpchunk_listhead control_send_queue;
  824 
  825         /* ASCONF chunk queue */
  826         struct sctpchunk_listhead asconf_send_queue;
  827 
  828         /*
  829          * Once a TSN hits the wire it is moved to the sent_queue. We
  830          * maintain two counts here (don't know if any but retran_cnt is
  831          * needed). The idea is that the sent_queue_retran_cnt reflects how
  832          * many chunks have been marked for retranmission by either T3-rxt
  833          * or FR.
  834          */
  835         struct sctpchunk_listhead sent_queue;
  836         struct sctpchunk_listhead send_queue;
  837 
  838         /* Scheduling queues */
  839         struct scheduling_data ss_data;
  840 
  841         /* If an iterator is looking at me, this is it */
  842         struct sctp_iterator *stcb_starting_point_for_iterator;
  843 
  844         /* ASCONF save the last ASCONF-ACK so we can resend it if necessary */
  845         struct sctp_asconf_ackhead asconf_ack_sent;
  846 
  847         /*
  848          * pointer to last stream reset queued to control queue by us with
  849          * requests.
  850          */
  851         struct sctp_tmit_chunk *str_reset;
  852         /*
  853          * if Source Address Selection happening, this will rotate through
  854          * the link list.
  855          */
  856         struct sctp_laddr *last_used_address;
  857 
  858         /* stream arrays */
  859         struct sctp_stream_in *strmin;
  860         struct sctp_stream_out *strmout;
  861         uint8_t *mapping_array;
  862         /* primary destination to use */
  863         struct sctp_nets *primary_destination;
  864         struct sctp_nets *alternate;    /* If primary is down or PF */
  865         /* For CMT */
  866         struct sctp_nets *last_net_cmt_send_started;
  867         /* last place I got a data chunk from */
  868         struct sctp_nets *last_data_chunk_from;
  869         /* last place I got a control from */
  870         struct sctp_nets *last_control_chunk_from;
  871 
  872 
  873         /*
  874          * wait to the point the cum-ack passes req->send_reset_at_tsn for
  875          * any req on the list.
  876          */
  877         struct sctp_resethead resetHead;
  878 
  879         /* queue of chunks waiting to be sent into the local stack */
  880         struct sctp_readhead pending_reply_queue;
  881 
  882         /* JRS - the congestion control functions are in this struct */
  883         struct sctp_cc_functions cc_functions;
  884         /*
  885          * JRS - value to store the currently loaded congestion control
  886          * module
  887          */
  888         uint32_t congestion_control_module;
  889         /* RS - the stream scheduling functions are in this struct */
  890         struct sctp_ss_functions ss_functions;
  891         /* RS - value to store the currently loaded stream scheduling module */
  892         uint32_t stream_scheduling_module;
  893 
  894         uint32_t vrf_id;
  895         uint32_t cookie_preserve_req;
  896         /* ASCONF next seq I am sending out, inits at init-tsn */
  897         uint32_t asconf_seq_out;
  898         uint32_t asconf_seq_out_acked;
  899         /* ASCONF last received ASCONF from peer, starts at peer's TSN-1 */
  900         uint32_t asconf_seq_in;
  901 
  902         /* next seq I am sending in str reset messages */
  903         uint32_t str_reset_seq_out;
  904         /* next seq I am expecting in str reset messages */
  905         uint32_t str_reset_seq_in;
  906 
  907         /* various verification tag information */
  908         uint32_t my_vtag;       /* The tag to be used. if assoc is re-initited
  909                                  * by remote end, and I have unlocked this
  910                                  * will be regenerated to a new random value. */
  911         uint32_t peer_vtag;     /* The peers last tag */
  912 
  913         uint32_t my_vtag_nonce;
  914         uint32_t peer_vtag_nonce;
  915 
  916         uint32_t assoc_id;
  917 
  918         /* This is the SCTP fragmentation threshold */
  919         uint32_t smallest_mtu;
  920 
  921         /*
  922          * Special hook for Fast retransmit, allows us to track the highest
  923          * TSN that is NEW in this SACK if gap ack blocks are present.
  924          */
  925         uint32_t this_sack_highest_gap;
  926 
  927         /*
  928          * The highest consecutive TSN that has been acked by peer on my
  929          * sends
  930          */
  931         uint32_t last_acked_seq;
  932 
  933         /* The next TSN that I will use in sending. */
  934         uint32_t sending_seq;
  935 
  936         /* Original seq number I used ??questionable to keep?? */
  937         uint32_t init_seq_number;
  938 
  939 
  940         /* The Advanced Peer Ack Point, as required by the PR-SCTP */
  941         /* (A1 in Section 4.2) */
  942         uint32_t advanced_peer_ack_point;
  943 
  944         /*
  945          * The highest consequetive TSN at the bottom of the mapping array
  946          * (for his sends).
  947          */
  948         uint32_t cumulative_tsn;
  949         /*
  950          * Used to track the mapping array and its offset bits. This MAY be
  951          * lower then cumulative_tsn.
  952          */
  953         uint32_t mapping_array_base_tsn;
  954         /*
  955          * used to track highest TSN we have received and is listed in the
  956          * mapping array.
  957          */
  958         uint32_t highest_tsn_inside_map;
  959 
  960         /* EY - new NR variables used for nr_sack based on mapping_array */
  961         uint8_t *nr_mapping_array;
  962         uint32_t highest_tsn_inside_nr_map;
  963 
  964         uint32_t fast_recovery_tsn;
  965         uint32_t sat_t3_recovery_tsn;
  966         uint32_t tsn_last_delivered;
  967         /*
  968          * For the pd-api we should re-write this a bit more efficient. We
  969          * could have multiple sctp_queued_to_read's that we are building at
  970          * once. Now we only do this when we get ready to deliver to the
  971          * socket buffer. Note that we depend on the fact that the struct is
  972          * "stuck" on the read queue until we finish all the pd-api.
  973          */
  974         struct sctp_queued_to_read *control_pdapi;
  975 
  976         uint32_t tsn_of_pdapi_last_delivered;
  977         uint32_t pdapi_ppid;
  978         uint32_t context;
  979         uint32_t last_reset_action[SCTP_MAX_RESET_PARAMS];
  980         uint32_t last_sending_seq[SCTP_MAX_RESET_PARAMS];
  981         uint32_t last_base_tsnsent[SCTP_MAX_RESET_PARAMS];
  982 #ifdef SCTP_ASOCLOG_OF_TSNS
  983         /*
  984          * special log  - This adds considerable size to the asoc, but
  985          * provides a log that you can use to detect problems via kgdb.
  986          */
  987         struct sctp_tsn_log in_tsnlog[SCTP_TSN_LOG_SIZE];
  988         struct sctp_tsn_log out_tsnlog[SCTP_TSN_LOG_SIZE];
  989         uint32_t cumack_log[SCTP_TSN_LOG_SIZE];
  990         uint32_t cumack_logsnt[SCTP_TSN_LOG_SIZE];
  991         uint16_t tsn_in_at;
  992         uint16_t tsn_out_at;
  993         uint16_t tsn_in_wrapped;
  994         uint16_t tsn_out_wrapped;
  995         uint16_t cumack_log_at;
  996         uint16_t cumack_log_atsnt;
  997 #endif                          /* SCTP_ASOCLOG_OF_TSNS */
  998 #ifdef SCTP_FS_SPEC_LOG
  999         struct sctp_fs_spec_log fslog[SCTP_FS_SPEC_LOG_SIZE];
 1000         uint16_t fs_index;
 1001 #endif
 1002 
 1003         /*
 1004          * window state information and smallest MTU that I use to bound
 1005          * segmentation
 1006          */
 1007         uint32_t peers_rwnd;
 1008         uint32_t my_rwnd;
 1009         uint32_t my_last_reported_rwnd;
 1010         uint32_t sctp_frag_point;
 1011 
 1012         uint32_t total_output_queue_size;
 1013 
 1014         uint32_t sb_cc;         /* shadow of sb_cc */
 1015         uint32_t sb_send_resv;  /* amount reserved on a send */
 1016         uint32_t my_rwnd_control_len;   /* shadow of sb_mbcnt used for rwnd
 1017                                          * control */
 1018 #ifdef INET6
 1019         uint32_t default_flowlabel;
 1020 #endif
 1021         uint32_t pr_sctp_cnt;
 1022         int ctrl_queue_cnt;     /* could be removed  REM - NO IT CAN'T!! RRS */
 1023         /*
 1024          * All outbound datagrams queue into this list from the individual
 1025          * stream queue. Here they get assigned a TSN and then await
 1026          * sending. The stream seq comes when it is first put in the
 1027          * individual str queue
 1028          */
 1029         unsigned int stream_queue_cnt;
 1030         unsigned int send_queue_cnt;
 1031         unsigned int sent_queue_cnt;
 1032         unsigned int sent_queue_cnt_removeable;
 1033         /*
 1034          * Number on sent queue that are marked for retran until this value
 1035          * is 0 we only send one packet of retran'ed data.
 1036          */
 1037         unsigned int sent_queue_retran_cnt;
 1038 
 1039         unsigned int size_on_reasm_queue;
 1040         unsigned int cnt_on_reasm_queue;
 1041         unsigned int fwd_tsn_cnt;
 1042         /* amount of data (bytes) currently in flight (on all destinations) */
 1043         unsigned int total_flight;
 1044         /* Total book size in flight */
 1045         unsigned int total_flight_count;        /* count of chunks used with
 1046                                                  * book total */
 1047         /* count of destinaton nets and list of destination nets */
 1048         unsigned int numnets;
 1049 
 1050         /* Total error count on this association */
 1051         unsigned int overall_error_count;
 1052 
 1053         unsigned int cnt_msg_on_sb;
 1054 
 1055         /* All stream count of chunks for delivery */
 1056         unsigned int size_on_all_streams;
 1057         unsigned int cnt_on_all_streams;
 1058 
 1059         /* Heart Beat delay in ms */
 1060         uint32_t heart_beat_delay;
 1061 
 1062         /* autoclose */
 1063         unsigned int sctp_autoclose_ticks;
 1064 
 1065         /* how many preopen streams we have */
 1066         unsigned int pre_open_streams;
 1067 
 1068         /* How many streams I support coming into me */
 1069         unsigned int max_inbound_streams;
 1070 
 1071         /* the cookie life I award for any cookie, in seconds */
 1072         unsigned int cookie_life;
 1073         /* time to delay acks for */
 1074         unsigned int delayed_ack;
 1075         unsigned int old_delayed_ack;
 1076         unsigned int sack_freq;
 1077         unsigned int data_pkts_seen;
 1078 
 1079         unsigned int numduptsns;
 1080         int dup_tsns[SCTP_MAX_DUP_TSNS];
 1081         unsigned int initial_init_rto_max;      /* initial RTO for INIT's */
 1082         unsigned int initial_rto;       /* initial send RTO */
 1083         unsigned int minrto;    /* per assoc RTO-MIN */
 1084         unsigned int maxrto;    /* per assoc RTO-MAX */
 1085 
 1086         /* authentication fields */
 1087         sctp_auth_chklist_t *local_auth_chunks;
 1088         sctp_auth_chklist_t *peer_auth_chunks;
 1089         sctp_hmaclist_t *local_hmacs;   /* local HMACs supported */
 1090         sctp_hmaclist_t *peer_hmacs;    /* peer HMACs supported */
 1091         struct sctp_keyhead shared_keys;        /* assoc's shared keys */
 1092         sctp_authinfo_t authinfo;       /* randoms, cached keys */
 1093         /*
 1094          * refcnt to block freeing when a sender or receiver is off coping
 1095          * user data in.
 1096          */
 1097         uint32_t refcnt;
 1098         uint32_t chunks_on_out_queue;   /* total chunks floating around,
 1099                                          * locked by send socket buffer */
 1100         uint32_t peers_adaptation;
 1101         uint16_t peer_hmac_id;  /* peer HMAC id to send */
 1102 
 1103         /*
 1104          * Being that we have no bag to collect stale cookies, and that we
 1105          * really would not want to anyway.. we will count them in this
 1106          * counter. We of course feed them to the pigeons right away (I have
 1107          * always thought of pigeons as flying rats).
 1108          */
 1109         uint16_t stale_cookie_count;
 1110 
 1111         /*
 1112          * For the partial delivery API, if up, invoked this is what last
 1113          * TSN I delivered
 1114          */
 1115         uint16_t str_of_pdapi;
 1116         uint16_t ssn_of_pdapi;
 1117 
 1118         /* counts of actual built streams. Allocation may be more however */
 1119         /* could re-arrange to optimize space here. */
 1120         uint16_t streamincnt;
 1121         uint16_t streamoutcnt;
 1122         uint16_t strm_realoutsize;
 1123         uint16_t strm_pending_add_size;
 1124         /* my maximum number of retrans of INIT and SEND */
 1125         /* copied from SCTP but should be individually setable */
 1126         uint16_t max_init_times;
 1127         uint16_t max_send_times;
 1128 
 1129         uint16_t def_net_failure;
 1130 
 1131         uint16_t def_net_pf_threshold;
 1132 
 1133         /*
 1134          * lock flag: 0 is ok to send, 1+ (duals as a retran count) is
 1135          * awaiting ACK
 1136          */
 1137         uint16_t mapping_array_size;
 1138 
 1139         uint16_t last_strm_seq_delivered;
 1140         uint16_t last_strm_no_delivered;
 1141 
 1142         uint16_t last_revoke_count;
 1143         int16_t num_send_timers_up;
 1144 
 1145         uint16_t stream_locked_on;
 1146         uint16_t ecn_echo_cnt_onq;
 1147 
 1148         uint16_t free_chunk_cnt;
 1149         uint8_t stream_locked;
 1150         uint8_t authenticated;  /* packet authenticated ok */
 1151         /*
 1152          * This flag indicates that a SACK need to be sent. Initially this
 1153          * is 1 to send the first sACK immediately.
 1154          */
 1155         uint8_t send_sack;
 1156 
 1157         /* max burst of new packets into the network */
 1158         uint32_t max_burst;
 1159         /* max burst of fast retransmit packets */
 1160         uint32_t fr_max_burst;
 1161 
 1162         uint8_t sat_network;    /* RTT is in range of sat net or greater */
 1163         uint8_t sat_network_lockout;    /* lockout code */
 1164         uint8_t burst_limit_applied;    /* Burst limit in effect at last send? */
 1165         /* flag goes on when we are doing a partial delivery api */
 1166         uint8_t hb_random_values[4];
 1167         uint8_t fragmented_delivery_inprogress;
 1168         uint8_t fragment_flags;
 1169         uint8_t last_flags_delivered;
 1170         uint8_t hb_ect_randombit;
 1171         uint8_t hb_random_idx;
 1172         uint8_t default_dscp;
 1173         uint8_t asconf_del_pending;     /* asconf delete last addr pending */
 1174         uint8_t trigger_reset;
 1175         /*
 1176          * This value, plus all other ack'd but above cum-ack is added
 1177          * together to cross check against the bit that we have yet to
 1178          * define (probably in the SACK). When the cum-ack is updated, this
 1179          * sum is updated as well.
 1180          */
 1181 
 1182         /* Flags whether an extension is supported or not */
 1183         uint8_t ecn_supported;
 1184         uint8_t prsctp_supported;
 1185         uint8_t auth_supported;
 1186         uint8_t asconf_supported;
 1187         uint8_t reconfig_supported;
 1188         uint8_t nrsack_supported;
 1189         uint8_t pktdrop_supported;
 1190         uint8_t idata_supported;
 1191 
 1192         /* Did the peer make the stream config (add out) request */
 1193         uint8_t peer_req_out;
 1194 
 1195         uint8_t local_strreset_support;
 1196         uint8_t peer_supports_nat;
 1197 
 1198         struct sctp_scoping scope;
 1199         /* flags to handle send alternate net tracking */
 1200         uint8_t used_alt_asconfack;
 1201         uint8_t fast_retran_loss_recovery;
 1202         uint8_t sat_t3_loss_recovery;
 1203         uint8_t dropped_special_cnt;
 1204         uint8_t seen_a_sack_this_pkt;
 1205         uint8_t stream_reset_outstanding;
 1206         uint8_t stream_reset_out_is_outstanding;
 1207         uint8_t delayed_connection;
 1208         uint8_t ifp_had_enobuf;
 1209         uint8_t saw_sack_with_frags;
 1210         uint8_t saw_sack_with_nr_frags;
 1211         uint8_t in_asocid_hash;
 1212         uint8_t assoc_up_sent;
 1213         uint8_t adaptation_needed;
 1214         uint8_t adaptation_sent;
 1215         /* CMT variables */
 1216         uint8_t cmt_dac_pkts_rcvd;
 1217         uint8_t sctp_cmt_on_off;
 1218         uint8_t iam_blocking;
 1219         uint8_t cookie_how[8];
 1220         /* JRS 5/21/07 - CMT PF variable */
 1221         uint8_t sctp_cmt_pf;
 1222         uint8_t use_precise_time;
 1223         uint64_t sctp_features;
 1224         uint32_t max_cwnd;
 1225         uint16_t port;          /* remote UDP encapsulation port */
 1226         /*
 1227          * The mapping array is used to track out of order sequences above
 1228          * last_acked_seq. 0 indicates packet missing 1 indicates packet
 1229          * rec'd. We slide it up every time we raise last_acked_seq and 0
 1230          * trailing locactions out.  If I get a TSN above the array
 1231          * mappingArraySz, I discard the datagram and let retransmit happen.
 1232          */
 1233         uint32_t marked_retrans;
 1234         uint32_t timoinit;
 1235         uint32_t timodata;
 1236         uint32_t timosack;
 1237         uint32_t timoshutdown;
 1238         uint32_t timoheartbeat;
 1239         uint32_t timocookie;
 1240         uint32_t timoshutdownack;
 1241         struct timeval start_time;
 1242         struct timeval discontinuity_time;
 1243         uint64_t abandoned_unsent[SCTP_PR_SCTP_MAX + 1];
 1244         uint64_t abandoned_sent[SCTP_PR_SCTP_MAX + 1];
 1245 };
 1246 
 1247 #endif

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