sctp_structs.h

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/*-
 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * a) Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * b) Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the distribution.
 *
 * c) Neither the name of Cisco Systems, Inc. nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifdef __FreeBSD__
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/sys/netinet/sctp_structs.h 303792 2016-08-06 12:33:15Z tuexen $");
#endif

#ifndef _NETINET_SCTP_STRUCTS_H_
#define _NETINET_SCTP_STRUCTS_H_

#include <netinet/sctp_os.h>
#include <netinet/sctp_header.h>
#include <netinet/sctp_auth.h>

struct sctp_timer {
    sctp_os_timer_t timer;

    int type;
    /*
     * Depending on the timer type these will be setup and cast with the
     * appropriate entity.
     */
    void *ep;
    void *tcb;
    void *net;
#if defined(__FreeBSD__) && __FreeBSD_version >= 800000
    void *vnet;
#endif

    /* for sanity checking */
    void *self;
    uint32_t ticks;
    uint32_t stopped_from;
};


struct sctp_foo_stuff {
    struct sctp_inpcb *inp;
    uint32_t        lineno;
    uint32_t        ticks;
    int             updown;
};


/*
 * This is the information we track on each interface that we know about from
 * the distant end.
 */
TAILQ_HEAD(sctpnetlisthead, sctp_nets);

struct sctp_stream_reset_list {
    TAILQ_ENTRY(sctp_stream_reset_list) next_resp;
    uint32_t seq;
    uint32_t tsn;
    uint32_t number_entries;
    uint16_t list_of_streams[];
};

TAILQ_HEAD(sctp_resethead, sctp_stream_reset_list);

/*
 * Users of the iterator need to malloc a iterator with a call to
 * sctp_initiate_iterator(inp_func, assoc_func, inp_func,  pcb_flags, pcb_features,
 *     asoc_state, void-ptr-arg, uint32-arg, end_func, inp);
 *
 * Use the following two defines if you don't care what pcb flags are on the EP
 * and/or you don't care what state the association is in.
 *
 * Note that if you specify an INP as the last argument then ONLY each
 * association of that single INP will be executed upon. Note that the pcb
 * flags STILL apply so if the inp you specify has different pcb_flags then
 * what you put in pcb_flags nothing will happen. use SCTP_PCB_ANY_FLAGS to
 * assure the inp you specify gets treated.
 */
#define SCTP_PCB_ANY_FLAGS  0x00000000
#define SCTP_PCB_ANY_FEATURES   0x00000000
#define SCTP_ASOC_ANY_STATE 0x00000000

typedef void (*asoc_func) (struct sctp_inpcb *, struct sctp_tcb *, void *ptr,
         uint32_t val);
typedef int (*inp_func) (struct sctp_inpcb *, void *ptr, uint32_t val);
typedef void (*end_func) (void *ptr, uint32_t val);

#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
/* whats on the mcore control struct */
struct sctp_mcore_queue {
    TAILQ_ENTRY(sctp_mcore_queue) next;
#if defined(__FreeBSD__) && __FreeBSD_version >= 801000
    struct vnet *vn;
#endif
    struct mbuf *m;
    int off;
    int v6;
};

TAILQ_HEAD(sctp_mcore_qhead, sctp_mcore_queue);

struct sctp_mcore_ctrl {
    SCTP_PROCESS_STRUCT thread_proc;
    struct sctp_mcore_qhead que;
    struct mtx core_mtx;
    struct mtx que_mtx;
    int running;
    int cpuid;
};


#endif


struct sctp_iterator {
    TAILQ_ENTRY(sctp_iterator) sctp_nxt_itr;
#if defined(__FreeBSD__) && __FreeBSD_version >= 801000
    struct vnet *vn;
#endif
    struct sctp_timer tmr;
    struct sctp_inpcb *inp;     /* current endpoint */
    struct sctp_tcb *stcb;      /* current* assoc */
    struct sctp_inpcb *next_inp;    /* special hook to skip to */
    asoc_func function_assoc;   /* per assoc function */
    inp_func function_inp;      /* per endpoint function */
    inp_func function_inp_end;  /* end INP function */
    end_func function_atend;    /* iterator completion function */
    void *pointer;          /* pointer for apply func to use */
    uint32_t val;           /* value for apply func to use */
    uint32_t pcb_flags;     /* endpoint flags being checked */
    uint32_t pcb_features;      /* endpoint features being checked */
    uint32_t asoc_state;        /* assoc state being checked */
    uint32_t iterator_flags;
    uint8_t  no_chunk_output;
    uint8_t  done_current_ep;
};
/* iterator_flags values */
#define SCTP_ITERATOR_DO_ALL_INP    0x00000001
#define SCTP_ITERATOR_DO_SINGLE_INP 0x00000002


TAILQ_HEAD(sctpiterators, sctp_iterator);

struct sctp_copy_all {
    struct sctp_inpcb *inp; /* ep */
    struct mbuf *m;
    struct sctp_sndrcvinfo sndrcv;
    int sndlen;
    int cnt_sent;
    int cnt_failed;
};

struct sctp_asconf_iterator {
    struct sctpladdr list_of_work;
    int cnt;
};

struct iterator_control {
#if defined(__FreeBSD__)
    struct mtx ipi_iterator_wq_mtx;
    struct mtx it_mtx;
#elif defined(__APPLE__)
    lck_mtx_t *ipi_iterator_wq_mtx;
    lck_mtx_t *it_mtx;
#elif defined(SCTP_PROCESS_LEVEL_LOCKS)
#if defined(__Userspace__)
    userland_mutex_t ipi_iterator_wq_mtx;
    userland_mutex_t it_mtx;
    userland_cond_t iterator_wakeup;
#else
    pthread_mutex_t ipi_iterator_wq_mtx;
    pthread_mutex_t it_mtx;
    pthread_cond_t iterator_wakeup;
#endif
#elif defined(__Windows__)
    struct spinlock it_lock;
    struct spinlock ipi_iterator_wq_lock;
    KEVENT iterator_wakeup[2];
    PFILE_OBJECT iterator_thread_obj;
#else
    void *it_mtx;
#endif
#if !defined(__Windows__)
#if !defined(__Userspace__)
    SCTP_PROCESS_STRUCT thread_proc;
#else
    userland_thread_t thread_proc;
#endif
#endif
    struct sctpiterators iteratorhead;
    struct sctp_iterator *cur_it;
    uint32_t iterator_running;
    uint32_t iterator_flags;
};
#if !defined(__FreeBSD__)
#define SCTP_ITERATOR_MUST_EXIT     0x00000001
#define SCTP_ITERATOR_EXITED        0x00000002
#endif
#define SCTP_ITERATOR_STOP_CUR_IT   0x00000004
#define SCTP_ITERATOR_STOP_CUR_INP  0x00000008

struct sctp_net_route {
    sctp_rtentry_t *ro_rt;
#if defined(__FreeBSD__)
#if __FreeBSD_version < 1100093
#if __FreeBSD_version >= 800000
    void *ro_lle;
#endif
#if __FreeBSD_version >= 900000
    void *ro_ia;
    int ro_flags;
#endif
#else
#if __FreeBSD_version >= 1100116
    struct llentry *ro_lle;
#endif
    char        *ro_prepend;
    uint16_t    ro_plen;
    uint16_t    ro_flags;
    uint16_t    ro_mtu;
    uint16_t    spare;
#endif
#endif
#if defined(__APPLE__)
#if !defined(APPLE_LEOPARD) && !defined(APPLE_SNOWLEOPARD) && !defined(APPLE_LION) && !defined(APPLE_MOUNTAINLION)
    struct ifaddr *ro_srcia;
#endif
#if !defined(APPLE_LEOPARD)
    uint32_t ro_flags;
#endif
#endif
    union sctp_sockstore _l_addr;   /* remote peer addr */
    struct sctp_ifa *_s_addr;   /* our selected src addr */
};

struct htcp {
    uint16_t    alpha;      /* Fixed point arith, << 7 */
    uint8_t     beta;           /* Fixed point arith, << 7 */
    uint8_t     modeswitch;     /* Delay modeswitch until we had at least one congestion event */
    uint32_t    last_cong;  /* Time since last congestion event end */
    uint32_t    undo_last_cong;
    uint16_t    bytes_acked;
    uint32_t    bytecount;
    uint32_t    minRTT;
    uint32_t    maxRTT;

    uint32_t    undo_maxRTT;
    uint32_t    undo_old_maxB;

    /* Bandwidth estimation */
    uint32_t    minB;
    uint32_t    maxB;
    uint32_t    old_maxB;
    uint32_t    Bi;
    uint32_t    lasttime;
};

struct rtcc_cc {
    struct timeval tls;   /* The time we started the sending  */
    uint64_t lbw;         /* Our last estimated bw */
    uint64_t lbw_rtt;     /* RTT at bw estimate */
    uint64_t bw_bytes;    /* The total bytes since this sending began */
    uint64_t bw_tot_time; /* The total time since sending began */
    uint64_t new_tot_time;  /* temp holding the new value */
    uint64_t bw_bytes_at_last_rttc; /* What bw_bytes was at last rtt calc */
    uint32_t cwnd_at_bw_set; /* Cwnd at last bw saved - lbw */
    uint32_t vol_reduce;  /* cnt of voluntary reductions */
    uint16_t steady_step; /* The number required to be in steady state*/
    uint16_t step_cnt;    /* The current number */
    uint8_t  ret_from_eq;  /* When all things are equal what do I return 0/1 - 1 no cc advance */
    uint8_t  use_dccc_ecn;  /* Flag to enable DCCC ECN */
    uint8_t  tls_needs_set; /* Flag to indicate we need to set tls 0 or 1 means set at send 2 not */
    uint8_t  last_step_state; /* Last state if steady state stepdown is on */
    uint8_t  rtt_set_this_sack; /* Flag saying this sack had RTT calc on it */
    uint8_t  last_inst_ind; /* Last saved inst indication */
};


struct sctp_nets {
    TAILQ_ENTRY(sctp_nets) sctp_next;   /* next link */

    /*
     * Things on the top half may be able to be split into a common
     * structure shared by all.
     */
    struct sctp_timer pmtu_timer;
    struct sctp_timer hb_timer;

    /*
     * The following two in combination equate to a route entry for v6
     * or v4.
     */
    struct sctp_net_route ro;

    /* mtu discovered so far */
    uint32_t mtu;
    uint32_t ssthresh;  /* not sure about this one for split */
    uint32_t last_cwr_tsn;
    uint32_t cwr_window_tsn;
    uint32_t ecn_ce_pkt_cnt;
    uint32_t lost_cnt;
    /* smoothed average things for RTT and RTO itself */
    int lastsa;
    int lastsv;
    uint64_t rtt; /* last measured rtt value in us */
    unsigned int RTO;

    /* This is used for SHUTDOWN/SHUTDOWN-ACK/SEND or INIT timers */
    struct sctp_timer rxt_timer;

    /* last time in seconds I sent to it */
    struct timeval last_sent_time;
    union cc_control_data {
        struct htcp htcp_ca;    /* JRS - struct used in HTCP algorithm */
        struct rtcc_cc rtcc;    /* rtcc module cc stuff  */
    } cc_mod;
    int ref_count;

    /* Congestion stats per destination */
    /*
     * flight size variables and such, sorry Vern, I could not avoid
     * this if I wanted performance :>
     */
    uint32_t flight_size;
    uint32_t cwnd;      /* actual cwnd */
    uint32_t prev_cwnd; /* cwnd before any processing */
    uint32_t ecn_prev_cwnd; /* ECN prev cwnd at first ecn_echo seen in new window */
    uint32_t partial_bytes_acked;   /* in CA tracks when to incr a MTU */
    /* tracking variables to avoid the aloc/free in sack processing */
    unsigned int net_ack;
    unsigned int net_ack2;

    /*
     * JRS - 5/8/07 - Variable to track last time
     *  a destination was active for CMT PF
     */
    uint32_t last_active;

    /*
     * CMT variables (iyengar@cis.udel.edu)
     */
    uint32_t this_sack_highest_newack;  /* tracks highest TSN newly
                         * acked for a given dest in
                         * the current SACK. Used in
                         * SFR and HTNA algos */
    uint32_t pseudo_cumack; /* CMT CUC algorithm. Maintains next expected
                 * pseudo-cumack for this destination */
    uint32_t rtx_pseudo_cumack; /* CMT CUC algorithm. Maintains next
                     * expected pseudo-cumack for this
                     * destination */

    /* CMT fast recovery variables */
    uint32_t fast_recovery_tsn;
    uint32_t heartbeat_random1;
    uint32_t heartbeat_random2;
#ifdef INET6
    uint32_t flowlabel;
#endif
    uint8_t dscp;

    struct timeval start_time;      /* time when this net was created */
    uint32_t marked_retrans;        /* number or DATA chunks marked for
                                       timer based retransmissions */
    uint32_t marked_fastretrans;
    uint32_t heart_beat_delay;      /* Heart Beat delay in ms */

    /* if this guy is ok or not ... status */
    uint16_t dest_state;
    /* number of timeouts to consider the destination unreachable */
    uint16_t failure_threshold;
    /* number of timeouts to consider the destination potentially failed */
    uint16_t pf_threshold;
    /* error stats on the destination */
    uint16_t error_count;
    /* UDP port number in case of UDP tunneling */
    uint16_t port;

    uint8_t fast_retran_loss_recovery;
    uint8_t will_exit_fast_recovery;
    /* Flags that probably can be combined into dest_state */
    uint8_t fast_retran_ip; /* fast retransmit in progress */
    uint8_t hb_responded;
    uint8_t saw_newack; /* CMT's SFR algorithm flag */
    uint8_t src_addr_selected;  /* if we split we move */
    uint8_t indx_of_eligible_next_to_use;
    uint8_t addr_is_local;  /* its a local address (if known) could move
                 * in split */

    /*
     * CMT variables (iyengar@cis.udel.edu)
     */
    uint8_t find_pseudo_cumack; /* CMT CUC algorithm. Flag used to
                     * find a new pseudocumack. This flag
                     * is set after a new pseudo-cumack
                     * has been received and indicates
                     * that the sender should find the
                     * next pseudo-cumack expected for
                     * this destination */
    uint8_t find_rtx_pseudo_cumack; /* CMT CUCv2 algorithm. Flag used to
                     * find a new rtx-pseudocumack. This
                     * flag is set after a new
                     * rtx-pseudo-cumack has been received
                     * and indicates that the sender
                     * should find the next
                     * rtx-pseudo-cumack expected for this
                     * destination */
    uint8_t new_pseudo_cumack;  /* CMT CUC algorithm. Flag used to
                     * indicate if a new pseudo-cumack or
                     * rtx-pseudo-cumack has been received */
    uint8_t window_probe;       /* Doing a window probe? */
    uint8_t RTO_measured;       /* Have we done the first measure */
    uint8_t last_hs_used;   /* index into the last HS table entry we used */
    uint8_t lan_type;
    uint8_t rto_needed;
#if defined(__FreeBSD__)
    uint32_t flowid;
    uint8_t flowtype;
#endif
};


struct sctp_data_chunkrec {
    uint32_t TSN_seq;   /* the TSN of this transmit */
    uint32_t stream_seq;    /* the stream sequence number of this transmit */
    uint16_t stream_number; /* the stream number of this guy */
    uint32_t payloadtype;
    uint32_t context;   /* from send */
    uint32_t cwnd_at_send;
    /*
     * part of the Highest sacked algorithm to be able to stroke counts
     * on ones that are FR'd.
     */
    uint32_t fast_retran_tsn;   /* sending_seq at the time of FR */
    struct timeval timetodrop;  /* time we drop it from queue */
    uint32_t fsn_num;       /* Fragment Sequence Number */
    uint8_t doing_fast_retransmit;
    uint8_t rcv_flags;  /* flags pulled from data chunk on inbound for
                 * outbound holds sending flags for PR-SCTP.
                 */
    uint8_t state_flags;
    uint8_t chunk_was_revoked;
    uint8_t fwd_tsn_cnt;
};

TAILQ_HEAD(sctpchunk_listhead, sctp_tmit_chunk);

/* The lower byte is used to enumerate PR_SCTP policies */
#define CHUNK_FLAGS_PR_SCTP_TTL         SCTP_PR_SCTP_TTL
#define CHUNK_FLAGS_PR_SCTP_BUF         SCTP_PR_SCTP_BUF
#define CHUNK_FLAGS_PR_SCTP_RTX         SCTP_PR_SCTP_RTX

/* The upper byte is used as a bit mask */
#define CHUNK_FLAGS_FRAGMENT_OK         0x0100

struct chk_id {
    uint8_t id;
    uint8_t can_take_data;
};


struct sctp_tmit_chunk {
    union {
        struct sctp_data_chunkrec data;
        struct chk_id chunk_id;
    }     rec;
    struct sctp_association *asoc;  /* bp to asoc this belongs to */
    struct timeval sent_rcv_time;   /* filled in if RTT being calculated */
    struct mbuf *data;  /* pointer to mbuf chain of data */
    struct mbuf *last_mbuf; /* pointer to last mbuf in chain */
    struct sctp_nets *whoTo;
    TAILQ_ENTRY(sctp_tmit_chunk) sctp_next; /* next link */
    int32_t sent;       /* the send status */
    uint16_t snd_count; /* number of times I sent */
    uint16_t flags;     /* flags, such as FRAGMENT_OK */
    uint16_t send_size;
    uint16_t book_size;
    uint16_t mbcnt;
    uint16_t auth_keyid;
    uint8_t holds_key_ref;  /* flag if auth keyid refcount is held */
    uint8_t pad_inplace;
    uint8_t do_rtt;
    uint8_t book_size_scale;
    uint8_t no_fr_allowed;
    uint8_t copy_by_ref;
    uint8_t window_probe;
};

struct sctp_queued_to_read {    /* sinfo structure Pluse more */
    uint16_t sinfo_stream;  /* off the wire */
    uint32_t sinfo_ssn; /* off the wire */
    uint16_t sinfo_flags;   /* SCTP_UNORDERED from wire use SCTP_EOF for
                 * EOR */
    uint32_t sinfo_ppid;    /* off the wire */
    uint32_t sinfo_context; /* pick this up from assoc def context? */
    uint32_t sinfo_timetolive;  /* not used by kernel */
    uint32_t sinfo_tsn; /* Use this in reassembly as first TSN */
    uint32_t sinfo_cumtsn;  /* Use this in reassembly as last TSN */
    sctp_assoc_t sinfo_assoc_id;    /* our assoc id */
    /* Non sinfo stuff */
    uint32_t msg_id;    /* Fragment Index */
    uint32_t length;    /* length of data */
    uint32_t held_length;   /* length held in sb */
    uint32_t top_fsn;   /* Highest FSN in queue */
    uint32_t fsn_included;  /* Highest FSN in *data portion */
    struct sctp_nets *whoFrom;  /* where it came from */
    struct mbuf *data;  /* front of the mbuf chain of data with
                 * PKT_HDR */
    struct mbuf *tail_mbuf; /* used for multi-part data */
    struct mbuf *aux_data;  /* used to hold/cache  control if o/s does not take it from us */
    struct sctp_tcb *stcb;  /* assoc, used for window update */
    TAILQ_ENTRY(sctp_queued_to_read) next;
    TAILQ_ENTRY(sctp_queued_to_read) next_instrm;
    struct sctpchunk_listhead reasm;
    uint16_t port_from;
    uint16_t spec_flags;    /* Flags to hold the notification field */
    uint8_t  do_not_ref_stcb;
    uint8_t  end_added;
    uint8_t  pdapi_aborted;
    uint8_t  pdapi_started;
    uint8_t  some_taken;
    uint8_t  last_frag_seen;
    uint8_t  first_frag_seen;
    uint8_t  on_read_q;
    uint8_t  on_strm_q;
};

#define SCTP_ON_ORDERED 1
#define SCTP_ON_UNORDERED 2

/* This data structure will be on the outbound
 * stream queues. Data will be pulled off from
 * the front of the mbuf data and chunk-ified
 * by the output routines. We will custom
 * fit every chunk we pull to the send/sent
 * queue to make up the next full packet
 * if we can. An entry cannot be removed
 * from the stream_out queue until
 * the msg_is_complete flag is set. This
 * means at times data/tail_mbuf MIGHT
 * be NULL.. If that occurs it happens
 * for one of two reasons. Either the user
 * is blocked on a send() call and has not
 * awoken to copy more data down... OR
 * the user is in the explict MSG_EOR mode
 * and wrote some data, but has not completed
 * sending.
 */
struct sctp_stream_queue_pending {
    struct mbuf *data;
    struct mbuf *tail_mbuf;
    struct timeval ts;
    struct sctp_nets *net;
    TAILQ_ENTRY (sctp_stream_queue_pending) next;
    TAILQ_ENTRY (sctp_stream_queue_pending) ss_next;
    uint32_t fsn;
    uint32_t length;
    uint32_t timetolive;
    uint32_t ppid;
    uint32_t context;
    uint16_t sinfo_flags;
    uint16_t stream;
    uint16_t act_flags;
    uint16_t auth_keyid;
    uint8_t  holds_key_ref;
    uint8_t  msg_is_complete;
    uint8_t  some_taken;
    uint8_t  sender_all_done;
    uint8_t  put_last_out;
    uint8_t  discard_rest;
};

/*
 * this struct contains info that is used to track inbound stream data and
 * help with ordering.
 */
TAILQ_HEAD(sctpwheelunrel_listhead, sctp_stream_in);
struct sctp_stream_in {
    struct sctp_readhead inqueue;
    struct sctp_readhead uno_inqueue;
    uint32_t last_sequence_delivered;   /* used for re-order */
    uint16_t stream_no;
    uint8_t  delivery_started;
    uint8_t  pd_api_started;
};

TAILQ_HEAD(sctpwheel_listhead, sctp_stream_out);
TAILQ_HEAD(sctplist_listhead, sctp_stream_queue_pending);


/* Round-robin schedulers */
struct ss_rr {
    /* next link in wheel */
    TAILQ_ENTRY(sctp_stream_out) next_spoke;
};

/* Priority scheduler */
struct ss_prio {
    /* next link in wheel */
    TAILQ_ENTRY(sctp_stream_out) next_spoke;
    /* priority id */
    uint16_t priority;
};

/* Fair Bandwidth scheduler */
struct ss_fb {
    /* next link in wheel */
    TAILQ_ENTRY(sctp_stream_out) next_spoke;
    /* stores message size */
    int32_t rounds;
};

/*
 * This union holds all data necessary for
 * different stream schedulers.
 */
struct scheduling_data {
    struct sctp_stream_out *locked_on_sending;
    /* circular looking for output selection */
    struct sctp_stream_out *last_out_stream;
    union {
        struct sctpwheel_listhead wheel;
        struct sctplist_listhead list;
    } out;
};

/*
 * This union holds all parameters per stream
 * necessary for different stream schedulers.
 */
union scheduling_parameters {
    struct ss_rr rr;
    struct ss_prio prio;
    struct ss_fb fb;
};

/* States for outgoing streams */
#define SCTP_STREAM_CLOSED           0x00
#define SCTP_STREAM_OPENING          0x01
#define SCTP_STREAM_OPEN             0x02
#define SCTP_STREAM_RESET_PENDING    0x03
#define SCTP_STREAM_RESET_IN_FLIGHT  0x04

#define SCTP_MAX_STREAMS_AT_ONCE_RESET 200

/* This struct is used to track the traffic on outbound streams */
struct sctp_stream_out {
    struct sctp_streamhead outqueue;
    union scheduling_parameters ss_params;
    uint32_t chunks_on_queues;      /* send queue and sent queue */
#if defined(SCTP_DETAILED_STR_STATS)
    uint32_t abandoned_unsent[SCTP_PR_SCTP_MAX + 1];
    uint32_t abandoned_sent[SCTP_PR_SCTP_MAX + 1];
#else
    /* Only the aggregation */
    uint32_t abandoned_unsent[1];
    uint32_t abandoned_sent[1];
#endif
    /* For associations using DATA chunks, the lower 16-bit of
     * next_mid_ordered are used as the next SSN.
     */
    uint32_t next_mid_ordered;
    uint32_t next_mid_unordered;
    uint16_t stream_no;
    uint8_t last_msg_incomplete;
    uint8_t state;
};

/* used to keep track of the addresses yet to try to add/delete */
TAILQ_HEAD(sctp_asconf_addrhead, sctp_asconf_addr);
struct sctp_asconf_addr {
    TAILQ_ENTRY(sctp_asconf_addr) next;
    struct sctp_asconf_addr_param ap;
    struct sctp_ifa *ifa;   /* save the ifa for add/del ip */
    uint8_t sent;       /* has this been sent yet? */
    uint8_t special_del;    /* not to be used in lookup */
};

struct sctp_scoping {
    uint8_t ipv4_addr_legal;
    uint8_t ipv6_addr_legal;
#if defined(__Userspace__)
    uint8_t conn_addr_legal;
#endif
    uint8_t loopback_scope;
    uint8_t ipv4_local_scope;
    uint8_t local_scope;
    uint8_t site_scope;
};

#define SCTP_TSN_LOG_SIZE 40

struct sctp_tsn_log {
    void     *stcb;
    uint32_t tsn;
    uint32_t seq;
    uint16_t strm;
    uint16_t sz;
    uint16_t flgs;
    uint16_t in_pos;
    uint16_t in_out;
    uint16_t resv;
};

#define SCTP_FS_SPEC_LOG_SIZE 200
struct sctp_fs_spec_log {
    uint32_t sent;
    uint32_t total_flight;
    uint32_t tsn;
    uint16_t book;
    uint8_t incr;
    uint8_t decr;
};

/* This struct is here to cut out the compatiabilty
 * pad that bulks up both the inp and stcb. The non
 * pad portion MUST stay in complete sync with
 * sctp_sndrcvinfo... i.e. if sinfo_xxxx is added
 * this must be done here too.
 */
struct sctp_nonpad_sndrcvinfo {
    uint16_t sinfo_stream;
    uint16_t sinfo_ssn;
    uint16_t sinfo_flags;
    uint32_t sinfo_ppid;
    uint32_t sinfo_context;
    uint32_t sinfo_timetolive;
    uint32_t sinfo_tsn;
    uint32_t sinfo_cumtsn;
    sctp_assoc_t sinfo_assoc_id;
    uint16_t sinfo_keynumber;
    uint16_t sinfo_keynumber_valid;
};

/*
 * JRS - Structure to hold function pointers to the functions responsible
 * for congestion control.
 */

struct sctp_cc_functions {
    void (*sctp_set_initial_cc_param)(struct sctp_tcb *stcb, struct sctp_nets *net);
    void (*sctp_cwnd_update_after_sack)(struct sctp_tcb *stcb,
                                        struct sctp_association *asoc,
                                        int accum_moved ,int reneged_all, int will_exit);
    void (*sctp_cwnd_update_exit_pf)(struct sctp_tcb *stcb, struct sctp_nets *net);
    void (*sctp_cwnd_update_after_fr)(struct sctp_tcb *stcb,
            struct sctp_association *asoc);
    void (*sctp_cwnd_update_after_timeout)(struct sctp_tcb *stcb,
            struct sctp_nets *net);
    void (*sctp_cwnd_update_after_ecn_echo)(struct sctp_tcb *stcb,
            struct sctp_nets *net, int in_window, int num_pkt_lost);
    void (*sctp_cwnd_update_after_packet_dropped)(struct sctp_tcb *stcb,
            struct sctp_nets *net, struct sctp_pktdrop_chunk *cp,
            uint32_t *bottle_bw, uint32_t *on_queue);
    void (*sctp_cwnd_update_after_output)(struct sctp_tcb *stcb,
            struct sctp_nets *net, int burst_limit);
    void (*sctp_cwnd_update_packet_transmitted)(struct sctp_tcb *stcb,
            struct sctp_nets *net);
    void (*sctp_cwnd_update_tsn_acknowledged)(struct sctp_nets *net,
            struct sctp_tmit_chunk *);
    void (*sctp_cwnd_new_transmission_begins)(struct sctp_tcb *stcb,
            struct sctp_nets *net);
    void (*sctp_cwnd_prepare_net_for_sack)(struct sctp_tcb *stcb,
            struct sctp_nets *net);
    int (*sctp_cwnd_socket_option)(struct sctp_tcb *stcb, int set, struct sctp_cc_option *);
    void (*sctp_rtt_calculated)(struct sctp_tcb *, struct sctp_nets *, struct timeval *);
};

/*
 * RS - Structure to hold function pointers to the functions responsible
 * for stream scheduling.
 */
struct sctp_ss_functions {
    void (*sctp_ss_init)(struct sctp_tcb *stcb, struct sctp_association *asoc,
        int holds_lock);
    void (*sctp_ss_clear)(struct sctp_tcb *stcb, struct sctp_association *asoc,
        int clear_values, int holds_lock);
    void (*sctp_ss_init_stream)(struct sctp_tcb *stcb, struct sctp_stream_out *strq, struct sctp_stream_out *with_strq);
    void (*sctp_ss_add_to_stream)(struct sctp_tcb *stcb, struct sctp_association *asoc,
        struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
    int (*sctp_ss_is_empty)(struct sctp_tcb *stcb, struct sctp_association *asoc);
    void (*sctp_ss_remove_from_stream)(struct sctp_tcb *stcb, struct sctp_association *asoc,
        struct sctp_stream_out *strq, struct sctp_stream_queue_pending *sp, int holds_lock);
    struct sctp_stream_out* (*sctp_ss_select_stream)(struct sctp_tcb *stcb,
        struct sctp_nets *net, struct sctp_association *asoc);
    void (*sctp_ss_scheduled)(struct sctp_tcb *stcb, struct sctp_nets *net,
        struct sctp_association *asoc, struct sctp_stream_out *strq, int moved_how_much);
    void (*sctp_ss_packet_done)(struct sctp_tcb *stcb, struct sctp_nets *net,
        struct sctp_association *asoc);
    int (*sctp_ss_get_value)(struct sctp_tcb *stcb, struct sctp_association *asoc,
        struct sctp_stream_out *strq, uint16_t *value);
    int (*sctp_ss_set_value)(struct sctp_tcb *stcb, struct sctp_association *asoc,
        struct sctp_stream_out *strq, uint16_t value);
    int (*sctp_ss_is_user_msgs_incomplete)(struct sctp_tcb *stcb, struct sctp_association *asoc);
};

/* used to save ASCONF chunks for retransmission */
TAILQ_HEAD(sctp_asconf_head, sctp_asconf);
struct sctp_asconf {
    TAILQ_ENTRY(sctp_asconf) next;
    uint32_t serial_number;
    uint16_t snd_count;
    struct mbuf *data;
    uint16_t len;
};

/* used to save ASCONF-ACK chunks for retransmission */
TAILQ_HEAD(sctp_asconf_ackhead, sctp_asconf_ack);
struct sctp_asconf_ack {
    TAILQ_ENTRY(sctp_asconf_ack) next;
    uint32_t serial_number;
    struct sctp_nets *last_sent_to;
    struct mbuf *data;
    uint16_t len;
};

/*
 * Here we have information about each individual association that we track.
 * We probably in production would be more dynamic. But for ease of
 * implementation we will have a fixed array that we hunt for in a linear
 * fashion.
 */
struct sctp_association {
    /* association state */
    int state;

    /* queue of pending addrs to add/delete */
    struct sctp_asconf_addrhead asconf_queue;

    struct timeval time_entered;    /* time we entered state */
    struct timeval time_last_rcvd;
    struct timeval time_last_sent;
    struct timeval time_last_sat_advance;
    struct sctp_nonpad_sndrcvinfo def_send;

    /* timers and such */
    struct sctp_timer dack_timer;       /* Delayed ack timer */
    struct sctp_timer asconf_timer;     /* asconf */
    struct sctp_timer strreset_timer;   /* stream reset */
    struct sctp_timer shut_guard_timer; /* shutdown guard */
    struct sctp_timer autoclose_timer;  /* automatic close timer */
    struct sctp_timer delayed_event_timer;  /* timer for delayed events */
    struct sctp_timer delete_prim_timer;    /* deleting primary dst */

    /* list of restricted local addresses */
    struct sctpladdr sctp_restricted_addrs;

    /* last local address pending deletion (waiting for an address add) */
    struct sctp_ifa *asconf_addr_del_pending;
    /* Deleted primary destination (used to stop timer) */
    struct sctp_nets *deleted_primary;

    struct sctpnetlisthead nets;        /* remote address list */

    /* Free chunk list */
    struct sctpchunk_listhead free_chunks;

    /* Control chunk queue */
    struct sctpchunk_listhead control_send_queue;

    /* ASCONF chunk queue */
    struct sctpchunk_listhead asconf_send_queue;

    /*
     * Once a TSN hits the wire it is moved to the sent_queue. We
     * maintain two counts here (don't know if any but retran_cnt is
     * needed). The idea is that the sent_queue_retran_cnt reflects how
     * many chunks have been marked for retranmission by either T3-rxt
     * or FR.
     */
    struct sctpchunk_listhead sent_queue;
    struct sctpchunk_listhead send_queue;

    /* Scheduling queues */
    struct scheduling_data ss_data;

    /* If an iterator is looking at me, this is it */
    struct sctp_iterator *stcb_starting_point_for_iterator;

    /* ASCONF save the last ASCONF-ACK so we can resend it if necessary */
    struct sctp_asconf_ackhead asconf_ack_sent;

    /*
     * pointer to last stream reset queued to control queue by us with
     * requests.
     */
    struct sctp_tmit_chunk *str_reset;
    /*
     * if Source Address Selection happening, this will rotate through
     * the link list.
     */
    struct sctp_laddr *last_used_address;

    /* stream arrays */
    struct sctp_stream_in *strmin;
    struct sctp_stream_out *strmout;
    uint8_t *mapping_array;
    /* primary destination to use */
    struct sctp_nets *primary_destination;
    struct sctp_nets *alternate; /* If primary is down or PF */
    /* For CMT */
    struct sctp_nets *last_net_cmt_send_started;
    /* last place I got a data chunk from */
    struct sctp_nets *last_data_chunk_from;
    /* last place I got a control from */
    struct sctp_nets *last_control_chunk_from;


    /*
     * wait to the point the cum-ack passes req->send_reset_at_tsn for
     * any req on the list.
     */
    struct sctp_resethead resetHead;

    /* queue of chunks waiting to be sent into the local stack */
    struct sctp_readhead pending_reply_queue;

    /* JRS - the congestion control functions are in this struct */
    struct sctp_cc_functions cc_functions;
    /* JRS - value to store the currently loaded congestion control module */
    uint32_t congestion_control_module;
    /* RS - the stream scheduling functions are in this struct */
    struct sctp_ss_functions ss_functions;
    /* RS - value to store the currently loaded stream scheduling module */
    uint32_t stream_scheduling_module;

    uint32_t vrf_id;
    uint32_t cookie_preserve_req;
    /* ASCONF next seq I am sending out, inits at init-tsn */
    uint32_t asconf_seq_out;
    uint32_t asconf_seq_out_acked;
    /* ASCONF last received ASCONF from peer, starts at peer's TSN-1 */
    uint32_t asconf_seq_in;

    /* next seq I am sending in str reset messages */
    uint32_t str_reset_seq_out;
    /* next seq I am expecting in str reset messages */
    uint32_t str_reset_seq_in;

    /* various verification tag information */
    uint32_t my_vtag;   /* The tag to be used. if assoc is re-initited
                 * by remote end, and I have unlocked this
                 * will be regenerated to a new random value. */
    uint32_t peer_vtag; /* The peers last tag */

    uint32_t my_vtag_nonce;
    uint32_t peer_vtag_nonce;

    uint32_t assoc_id;

    /* This is the SCTP fragmentation threshold */
    uint32_t smallest_mtu;

    /*
     * Special hook for Fast retransmit, allows us to track the highest
     * TSN that is NEW in this SACK if gap ack blocks are present.
     */
    uint32_t this_sack_highest_gap;

    /*
     * The highest consecutive TSN that has been acked by peer on my
     * sends
     */
    uint32_t last_acked_seq;

    /* The next TSN that I will use in sending. */
    uint32_t sending_seq;

    /* Original seq number I used ??questionable to keep?? */
    uint32_t init_seq_number;


    /* The Advanced Peer Ack Point, as required by the PR-SCTP */
    /* (A1 in Section 4.2) */
    uint32_t advanced_peer_ack_point;

    /*
     * The highest consequetive TSN at the bottom of the mapping array
     * (for his sends).
     */
    uint32_t cumulative_tsn;
    /*
     * Used to track the mapping array and its offset bits. This MAY be
     * lower then cumulative_tsn.
     */
    uint32_t mapping_array_base_tsn;
    /*
     * used to track highest TSN we have received and is listed in the
     * mapping array.
     */
    uint32_t highest_tsn_inside_map;

    /* EY - new NR variables used for nr_sack based on mapping_array*/
    uint8_t *nr_mapping_array;
    uint32_t highest_tsn_inside_nr_map;

    uint32_t fast_recovery_tsn;
    uint32_t sat_t3_recovery_tsn;
    uint32_t tsn_last_delivered;
    /*
     * For the pd-api we should re-write this a bit more efficient. We
     * could have multiple sctp_queued_to_read's that we are building at
     * once. Now we only do this when we get ready to deliver to the
     * socket buffer. Note that we depend on the fact that the struct is
     * "stuck" on the read queue until we finish all the pd-api.
     */
    struct sctp_queued_to_read *control_pdapi;

    uint32_t tsn_of_pdapi_last_delivered;
    uint32_t pdapi_ppid;
    uint32_t context;
    uint32_t last_reset_action[SCTP_MAX_RESET_PARAMS];
    uint32_t last_sending_seq[SCTP_MAX_RESET_PARAMS];
    uint32_t last_base_tsnsent[SCTP_MAX_RESET_PARAMS];
#ifdef SCTP_ASOCLOG_OF_TSNS
    /*
     * special log  - This adds considerable size
     * to the asoc, but provides a log that you
     * can use to detect problems via kgdb.
     */
    struct sctp_tsn_log  in_tsnlog[SCTP_TSN_LOG_SIZE];
    struct sctp_tsn_log  out_tsnlog[SCTP_TSN_LOG_SIZE];
    uint32_t cumack_log[SCTP_TSN_LOG_SIZE];
    uint32_t cumack_logsnt[SCTP_TSN_LOG_SIZE];
    uint16_t tsn_in_at;
    uint16_t tsn_out_at;
    uint16_t tsn_in_wrapped;
    uint16_t tsn_out_wrapped;
    uint16_t cumack_log_at;
    uint16_t cumack_log_atsnt;
#endif /* SCTP_ASOCLOG_OF_TSNS */
#ifdef SCTP_FS_SPEC_LOG
    struct sctp_fs_spec_log fslog[SCTP_FS_SPEC_LOG_SIZE];
    uint16_t fs_index;
#endif

    /*
     * window state information and smallest MTU that I use to bound
     * segmentation
     */
    uint32_t peers_rwnd;
    uint32_t my_rwnd;
    uint32_t my_last_reported_rwnd;
    uint32_t sctp_frag_point;

    uint32_t total_output_queue_size;

    uint32_t sb_cc;            /* shadow of sb_cc */
    uint32_t sb_send_resv;     /* amount reserved on a send */
    uint32_t my_rwnd_control_len; /* shadow of sb_mbcnt used for rwnd control */
#ifdef INET6
    uint32_t default_flowlabel;
#endif
    uint32_t pr_sctp_cnt;
    int ctrl_queue_cnt; /* could be removed  REM - NO IT CAN'T!! RRS */
    /*
     * All outbound datagrams queue into this list from the individual
     * stream queue. Here they get assigned a TSN and then await
     * sending. The stream seq comes when it is first put in the
     * individual str queue
     */
    unsigned int stream_queue_cnt;
    unsigned int send_queue_cnt;
    unsigned int sent_queue_cnt;
    unsigned int sent_queue_cnt_removeable;
    /*
     * Number on sent queue that are marked for retran until this value
     * is 0 we only send one packet of retran'ed data.
     */
    unsigned int sent_queue_retran_cnt;

    unsigned int size_on_reasm_queue;
    unsigned int cnt_on_reasm_queue;
    unsigned int fwd_tsn_cnt;
    /* amount of data (bytes) currently in flight (on all destinations) */
    unsigned int total_flight;
    /* Total book size in flight */
    unsigned int total_flight_count;    /* count of chunks used with
                         * book total */
    /* count of destinaton nets and list of destination nets */
    unsigned int numnets;

    /* Total error count on this association */
    unsigned int overall_error_count;

    unsigned int cnt_msg_on_sb;

    /* All stream count of chunks for delivery */
    unsigned int size_on_all_streams;
    unsigned int cnt_on_all_streams;

    /* Heart Beat delay in ms */
    uint32_t heart_beat_delay;

    /* autoclose */
    unsigned int sctp_autoclose_ticks;

    /* how many preopen streams we have */
    unsigned int pre_open_streams;

    /* How many streams I support coming into me */
    unsigned int max_inbound_streams;

    /* the cookie life I award for any cookie, in seconds */
    unsigned int cookie_life;
    /* time to delay acks for */
    unsigned int delayed_ack;
    unsigned int old_delayed_ack;
    unsigned int sack_freq;
    unsigned int data_pkts_seen;

    unsigned int numduptsns;
    int dup_tsns[SCTP_MAX_DUP_TSNS];
    unsigned int initial_init_rto_max;  /* initial RTO for INIT's */
    unsigned int initial_rto;   /* initial send RTO */
    unsigned int minrto;    /* per assoc RTO-MIN */
    unsigned int maxrto;    /* per assoc RTO-MAX */

    /* authentication fields */
    sctp_auth_chklist_t *local_auth_chunks;
    sctp_auth_chklist_t *peer_auth_chunks;
    sctp_hmaclist_t *local_hmacs;   /* local HMACs supported */
    sctp_hmaclist_t *peer_hmacs;    /* peer HMACs supported */
    struct sctp_keyhead shared_keys;    /* assoc's shared keys */
    sctp_authinfo_t authinfo;   /* randoms, cached keys */
    /*
     * refcnt to block freeing when a sender or receiver is off coping
     * user data in.
     */
    uint32_t refcnt;
    uint32_t chunks_on_out_queue;   /* total chunks floating around,
                     * locked by send socket buffer */
    uint32_t peers_adaptation;
    uint16_t peer_hmac_id;  /* peer HMAC id to send */

    /*
     * Being that we have no bag to collect stale cookies, and that we
     * really would not want to anyway.. we will count them in this
     * counter. We of course feed them to the pigeons right away (I have
     * always thought of pigeons as flying rats).
     */
    uint16_t stale_cookie_count;

    /*
     * For the partial delivery API, if up, invoked this is what last
     * TSN I delivered
     */
    uint16_t str_of_pdapi;
    uint16_t ssn_of_pdapi;

    /* counts of actual built streams. Allocation may be more however */
    /* could re-arrange to optimize space here. */
    uint16_t streamincnt;
    uint16_t streamoutcnt;
    uint16_t strm_realoutsize;
    uint16_t strm_pending_add_size;
    /* my maximum number of retrans of INIT and SEND */
    /* copied from SCTP but should be individually setable */
    uint16_t max_init_times;
    uint16_t max_send_times;

    uint16_t def_net_failure;

    uint16_t def_net_pf_threshold;

    /*
     * lock flag: 0 is ok to send, 1+ (duals as a retran count) is
     * awaiting ACK
     */
    uint16_t mapping_array_size;

    uint16_t last_strm_seq_delivered;
    uint16_t last_strm_no_delivered;

    uint16_t last_revoke_count;
    int16_t num_send_timers_up;

    uint16_t stream_locked_on;
    uint16_t ecn_echo_cnt_onq;

    uint16_t free_chunk_cnt;
    uint8_t stream_locked;
    uint8_t authenticated;  /* packet authenticated ok */
    /*
     * This flag indicates that a SACK need to be sent.
     * Initially this is 1 to send the first sACK immediately.
     */
    uint8_t send_sack;

    /* max burst of new packets into the network */
    uint32_t max_burst;
    /* max burst of fast retransmit packets */
    uint32_t fr_max_burst;

    uint8_t sat_network;    /* RTT is in range of sat net or greater */
    uint8_t sat_network_lockout;    /* lockout code */
    uint8_t burst_limit_applied;    /* Burst limit in effect at last send? */
    /* flag goes on when we are doing a partial delivery api */
    uint8_t hb_random_values[4];
    uint8_t fragmented_delivery_inprogress;
    uint8_t fragment_flags;
    uint8_t last_flags_delivered;
    uint8_t hb_ect_randombit;
    uint8_t hb_random_idx;
    uint8_t default_dscp;
    uint8_t asconf_del_pending; /* asconf delete last addr pending */
    uint8_t trigger_reset;
    /*
     * This value, plus all other ack'd but above cum-ack is added
     * together to cross check against the bit that we have yet to
     * define (probably in the SACK). When the cum-ack is updated, this
     * sum is updated as well.
     */

    /* Flags whether an extension is supported or not */
    uint8_t ecn_supported;
    uint8_t prsctp_supported;
    uint8_t auth_supported;
    uint8_t asconf_supported;
    uint8_t reconfig_supported;
    uint8_t nrsack_supported;
    uint8_t pktdrop_supported;
    uint8_t idata_supported;

    /* Did the peer make the stream config (add out) request */
    uint8_t peer_req_out;

    uint8_t local_strreset_support;
    uint8_t peer_supports_nat;

    struct sctp_scoping scope;
    /* flags to handle send alternate net tracking */
    uint8_t used_alt_asconfack;
    uint8_t fast_retran_loss_recovery;
    uint8_t sat_t3_loss_recovery;
    uint8_t dropped_special_cnt;
    uint8_t seen_a_sack_this_pkt;
    uint8_t stream_reset_outstanding;
    uint8_t stream_reset_out_is_outstanding;
    uint8_t delayed_connection;
    uint8_t ifp_had_enobuf;
    uint8_t saw_sack_with_frags;
    uint8_t saw_sack_with_nr_frags;
    uint8_t in_asocid_hash;
    uint8_t assoc_up_sent;
    uint8_t adaptation_needed;
    uint8_t adaptation_sent;
    /* CMT variables */
    uint8_t cmt_dac_pkts_rcvd;
    uint8_t sctp_cmt_on_off;
    uint8_t iam_blocking;
    uint8_t cookie_how[8];
    /* JRS 5/21/07 - CMT PF variable */
    uint8_t sctp_cmt_pf;
    uint8_t use_precise_time;
    uint64_t sctp_features;
    uint32_t max_cwnd;
    uint16_t port; /* remote UDP encapsulation port */
    /*
     * The mapping array is used to track out of order sequences above
     * last_acked_seq. 0 indicates packet missing 1 indicates packet
     * rec'd. We slide it up every time we raise last_acked_seq and 0
     * trailing locactions out.  If I get a TSN above the array
     * mappingArraySz, I discard the datagram and let retransmit happen.
     */
    uint32_t marked_retrans;
    uint32_t timoinit;
    uint32_t timodata;
    uint32_t timosack;
    uint32_t timoshutdown;
    uint32_t timoheartbeat;
    uint32_t timocookie;
    uint32_t timoshutdownack;
    struct timeval start_time;
    struct timeval discontinuity_time;
    uint64_t abandoned_unsent[SCTP_PR_SCTP_MAX + 1];
    uint64_t abandoned_sent[SCTP_PR_SCTP_MAX + 1];
};

#endif