FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_pcb.h

     /*      $KAME: sctp_pcb.h,v 1.21 2005/07/16 01:18:47 suz Exp $  */
     /*      $NetBSD: sctp_pcb.h,v 1.7 2022/10/28 05:26:29 ozaki-r Exp $ */
     
     #ifndef __SCTP_PCB_H__
     #define __SCTP_PCB_H__
     
     /*
      * Copyright (c) 2001, 2002, 2003, 2004 Cisco Systems, Inc.
      * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Cisco Systems, Inc.
     * 4. Neither the name of the project 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 CISCO SYSTEMS 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 CISCO SYSTEMS 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.
     */
    
    /*
     * We must have V6 so the size of the proto can be calculated. Otherwise
     * we would not allocate enough for Net/Open BSD :-<
     */
    #include <net/if.h>
    #include <netinet/in_pcb.h>
    #include <netinet/ip6.h>
    #include <netinet6/ip6_var.h>
    #include <netinet6/ip6protosw.h>
    #include <netinet6/in6_var.h>
    #include <netinet6/in6_pcb.h>
    
    #include <netinet/sctp.h>
    #include <netinet/sctp_constants.h>
    
    LIST_HEAD(sctppcbhead, sctp_inpcb);
    LIST_HEAD(sctpasochead, sctp_tcb);
    TAILQ_HEAD(sctpsocketq, sctp_socket_q_list);
    LIST_HEAD(sctpladdr, sctp_laddr);
    LIST_HEAD(sctpvtaghead, sctp_tagblock);
    
    #include <netinet/sctp_structs.h>
    #include <netinet/sctp_uio.h>
    
    /*
     * PCB flags
     */
    #define SCTP_PCB_FLAGS_UDPTYPE          0x00000001
    #define SCTP_PCB_FLAGS_TCPTYPE          0x00000002
    #define SCTP_PCB_FLAGS_BOUNDALL         0x00000004
    #define SCTP_PCB_FLAGS_ACCEPTING        0x00000008
    #define SCTP_PCB_FLAGS_UNBOUND          0x00000010
    #define SCTP_PCB_FLAGS_DO_ASCONF        0x00000020
    #define SCTP_PCB_FLAGS_AUTO_ASCONF      0x00000040
    /* socket options */
    #define SCTP_PCB_FLAGS_NODELAY          0x00000100
    #define SCTP_PCB_FLAGS_AUTOCLOSE        0x00000200
    #define SCTP_PCB_FLAGS_RECVDATAIOEVNT   0x00000400
    #define SCTP_PCB_FLAGS_RECVASSOCEVNT    0x00000800
    #define SCTP_PCB_FLAGS_RECVPADDREVNT    0x00001000
    #define SCTP_PCB_FLAGS_RECVPEERERR      0x00002000
    #define SCTP_PCB_FLAGS_RECVSENDFAILEVNT 0x00004000
    #define SCTP_PCB_FLAGS_RECVSHUTDOWNEVNT 0x00008000
    #define SCTP_PCB_FLAGS_ADAPTIONEVNT     0x00010000
    #define SCTP_PCB_FLAGS_PDAPIEVNT        0x00020000
    #define SCTP_PCB_FLAGS_STREAM_RESETEVNT 0x00040000
    #define SCTP_PCB_FLAGS_NO_FRAGMENT      0x00080000
    /* TCP model support */
    #define SCTP_PCB_FLAGS_CONNECTED        0x00100000
    #define SCTP_PCB_FLAGS_IN_TCPPOOL       0x00200000
    #define SCTP_PCB_FLAGS_DONT_WAKE        0x00400000
    #define SCTP_PCB_FLAGS_WAKEOUTPUT       0x00800000
    #define SCTP_PCB_FLAGS_WAKEINPUT        0x01000000
    #define SCTP_PCB_FLAGS_BOUND_V6         0x02000000
    #define SCTP_PCB_FLAGS_NEEDS_MAPPED_V4  0x04000000
    #define SCTP_PCB_FLAGS_BLOCKING_IO      0x08000000
    #define SCTP_PCB_FLAGS_SOCKET_GONE      0x10000000
    #define SCTP_PCB_FLAGS_SOCKET_ALLGONE   0x20000000
    
    /* flags to copy to new PCB */
    #define SCTP_PCB_COPY_FLAGS             0x0707ff64
   
   #define SCTP_PCBHASH_ALLADDR(port, mask) (port & mask)
   #define SCTP_PCBHASH_ASOC(tag, mask) (tag & mask)
   
   struct sctp_laddr {
           LIST_ENTRY(sctp_laddr) sctp_nxt_addr;   /* next in list */
           struct ifaddr *ifa;
   };
   
   struct sctp_timewait {
           uint32_t tv_sec_at_expire;      /* the seconds from boot to expire */
           uint32_t v_tag;         /* the vtag that can not be reused */
   };
   
   struct sctp_tagblock {
           LIST_ENTRY(sctp_tagblock) sctp_nxt_tagblock;
           struct sctp_timewait vtag_block[SCTP_NUMBER_IN_VTAG_BLOCK];
   };
   
   struct sctp_epinfo {
           struct sctpasochead *sctp_asochash;
           u_long hashasocmark;
   
           struct sctppcbhead *sctp_ephash;
           u_long hashmark;
   
           /*
            * The TCP model represents a substantial overhead in that we get
            * an additional hash table to keep explicit connections in. The
            * listening TCP endpoint will exist in the usual ephash above and
            * accept only INIT's. It will be incapable of sending off an INIT.
            * When a dg arrives we must look in the normal ephash. If we find
            * a TCP endpoint that will tell us to go to the specific endpoint
            * hash and re-hash to find the right assoc/socket. If we find a
            * UDP model socket we then must complete the lookup. If this fails,
            * i.e. no association can be found then we must continue to see if
            * a sctp_peeloff()'d socket is in the tcpephash (a spun off socket
            * acts like a TCP model connected socket).
            */
           struct sctppcbhead *sctp_tcpephash;
           u_long hashtcpmark;
           uint32_t hashtblsize;
   
           struct sctppcbhead listhead;
   
           struct sctpiterators iteratorhead;
   
           /* ep zone info */
   #if defined(__FreeBSD__) || defined(__APPLE__)
   #if __FreeBSD_version >= 500000
           struct uma_zone *ipi_zone_ep;
           struct uma_zone *ipi_zone_asoc;
           struct uma_zone *ipi_zone_laddr;
           struct uma_zone *ipi_zone_net;
           struct uma_zone *ipi_zone_chunk;
           struct uma_zone *ipi_zone_sockq;
   #else
           struct vm_zone *ipi_zone_ep;
           struct vm_zone *ipi_zone_asoc;
           struct vm_zone *ipi_zone_laddr;
           struct vm_zone *ipi_zone_net;
           struct vm_zone *ipi_zone_chunk;
           struct vm_zone *ipi_zone_sockq;
   #endif
   #endif
   #if defined(__NetBSD__) || defined(__OpenBSD__)
           struct pool ipi_zone_ep;
           struct pool ipi_zone_asoc;
           struct pool ipi_zone_laddr;
           struct pool ipi_zone_net;
           struct pool ipi_zone_chunk;
           struct pool ipi_zone_sockq;
           struct pool ipi_zone_hash;
   #endif
   
   #if defined(__FreeBSD__) && __FreeBSD_version >= 503000
           struct mtx ipi_ep_mtx;
           struct mtx it_mtx;
   #elif 0 /* defined(__NetBSD__) */
           krwlock_t ipi_ep_mtx;
           kmutex_t it_mtx;
   #endif
           u_int ipi_count_ep;
           u_quad_t ipi_gencnt_ep;
   
           /* assoc/tcb zone info */
           u_int ipi_count_asoc;
           u_quad_t ipi_gencnt_asoc;
   
           /* local addrlist zone info */
           u_int ipi_count_laddr;
           u_quad_t ipi_gencnt_laddr;
   
           /* remote addrlist zone info */
           u_int ipi_count_raddr;
           u_quad_t ipi_gencnt_raddr;
   
           /* chunk structure list for output */
           u_int ipi_count_chunk;
           u_quad_t ipi_gencnt_chunk;
   
           /* socket queue zone info */
           u_int ipi_count_sockq;
           u_quad_t ipi_gencnt_sockq;
   
           struct sctpvtaghead vtag_timewait[SCTP_STACK_VTAG_HASH_SIZE];
   
   #ifdef _SCTP_NEEDS_CALLOUT_
           struct calloutlist callqueue;
   #endif /* _SCTP_NEEDS_CALLOUT_ */
   
           uint32_t mbuf_track;
   
           /* for port allocations */
           uint16_t lastport;
           uint16_t lastlow;
           uint16_t lasthi;
   
   };
   
   extern uint32_t sctp_pegs[SCTP_NUMBER_OF_PEGS];
   /*
    * Here we have all the relevant information for each SCTP entity created.
    * We will need to modify this as approprate. We also need to figure out
    * how to access /dev/random.
    */
   struct sctp_pcb {
           unsigned int time_of_secret_change; /* number of seconds from timeval.tv_sec */
           uint32_t secret_key[SCTP_HOW_MANY_SECRETS][SCTP_NUMBER_OF_SECRETS];
           unsigned int size_of_a_cookie;
   
           unsigned int sctp_timeoutticks[SCTP_NUM_TMRS];
           unsigned int sctp_minrto;
           unsigned int sctp_maxrto;
           unsigned int initial_rto;
   
           int initial_init_rto_max;
   
           uint32_t sctp_sws_sender;
           uint32_t sctp_sws_receiver;
   
           /* various thresholds */
           /* Max times I will init at a guy */
           uint16_t max_init_times;
   
           /* Max times I will send before we consider someone dead */
           uint16_t max_send_times;
   
           uint16_t def_net_failure;
   
           /* number of streams to pre-open on a association */
           uint16_t pre_open_stream_count;
           uint16_t max_open_streams_intome;
   
           /*
            * This timer is kept running per endpoint.  When it fires it
            * will change the secret key.  The default is once a hour
            */
           struct sctp_timer signature_change;
           int def_cookie_life;
           /* defaults to 0 */
           int auto_close_time;
           uint32_t initial_sequence_debug;
           uint32_t adaption_layer_indicator;
           uint8_t max_burst;
           char current_secret_number;
           char last_secret_number;
   };
   
   #ifndef SCTP_ALIGNMENT
   #define SCTP_ALIGNMENT 32
   #endif
   
   #ifndef SCTP_ALIGNM1
   #define SCTP_ALIGNM1 (SCTP_ALIGNMENT-1)
   #endif
   
   #define sctp_lport ip_inp.inp.inp_lport
   
   struct sctp_socket_q_list {
           struct sctp_tcb *tcb;
           TAILQ_ENTRY(sctp_socket_q_list) next_sq;
   };
   
   struct sctp_inpcb {
           /*
            * put an inpcb in front of it all, kind of a waste but we need
            * to for compatibility with all the other stuff.
            */
           union {
                   struct inpcb inp;
                   char align[(sizeof(struct in6pcb) + SCTP_ALIGNM1) &
                             ~SCTP_ALIGNM1];
           } ip_inp;
           LIST_ENTRY(sctp_inpcb) sctp_list;       /* lists all endpoints */
           /* hash of all endpoints for model */
           LIST_ENTRY(sctp_inpcb) sctp_hash;
   
           /* count of local addresses bound, 0 if bound all */
           int laddr_count;
           /* list of addrs in use by the EP */
           struct sctpladdr sctp_addr_list;
           /* used for source address selection rotation */
           struct sctp_laddr *next_addr_touse;
           struct ifnet *next_ifn_touse;
           /* back pointer to our socket */
           struct socket *sctp_socket;
           uint32_t sctp_flags;                    /* flag set */
           struct sctp_pcb sctp_ep;                /* SCTP ep data */
           /* head of the hash of all associations */
           struct sctpasochead *sctp_tcbhash;
           u_long sctp_hashmark;
           /* head of the list of all associations */
           struct sctpasochead sctp_asoc_list;
           /* queue of TCB's waiting to stuff data up the socket */
           struct sctpsocketq sctp_queue_list;
           void *sctp_tcb_at_block;
           struct sctp_iterator *inp_starting_point_for_iterator;
           int  error_on_block;
           uint32_t sctp_frag_point;
           uint32_t sctp_vtag_first;
           struct mbuf *pkt, *pkt_last, *sb_last_mpkt;
           struct mbuf *control;
   #if !(defined(__FreeBSD__) || defined(__APPLE__))
   #ifndef INP_IPV6
   #define INP_IPV6        0x1
   #endif
   #ifndef INP_IPV4
   #define INP_IPV4        0x2
   #endif
           u_char inp_vflag;
           u_char inp_ip_ttl;
           u_char inp_ip_tos;
           u_char inp_ip_resv;
   #endif
   #if defined(__FreeBSD__) && __FreeBSD_version >= 503000
           struct mtx inp_mtx;
           struct mtx inp_create_mtx;
           u_int32_t refcount;
   #elif defined(__NetBSD__)
           kmutex_t inp_mtx;
           kmutex_t inp_create_mtx;
           u_int32_t refcount;
   #endif
   };
   
   struct sctp_tcb {
           struct socket *sctp_socket;             /* back pointer to socket */
           struct sctp_inpcb *sctp_ep;             /* back pointer to ep */
           LIST_ENTRY(sctp_tcb) sctp_tcbhash;      /* next link in hash table */
           LIST_ENTRY(sctp_tcb) sctp_tcblist;      /* list of all of the TCB's */
           LIST_ENTRY(sctp_tcb) sctp_asocs;
           struct sctp_association asoc;
           uint16_t rport;                 /* remote port in network format */
           uint16_t resv;
   #if defined(__FreeBSD__) && __FreeBSD_version >= 503000
           struct mtx tcb_mtx;
   #elif defined(__NetBSD__)
           kmutex_t tcb_mtx;
   #endif
   };
   
   #if defined(__FreeBSD__) && __FreeBSD_version >= 503000
   
   /* General locking concepts:
    * The goal of our locking is to of course provide
    * consistency and yet minimize overhead. We will
    * attempt to use non-recursive locks which are supposed
    * to be quite inexpensive. Now in order to do this the goal
    * is that most functions are not aware of locking. Once we
    * have a TCB we lock it and unlock when we are through. This
    * means that the TCB lock is kind-of a "global" lock when
    * working on an association. Caution must be used when
    * asserting a TCB_LOCK since if we recurse we deadlock.
    *
    * Most other locks (INP and INFO) attempt to localize
    * the locking i.e. we try to contain the lock and
    * unlock within the function that needs to lock it. This
    * sometimes mean we do extra locks and unlocks and loose
    * a bit of efficiency, but if the performance statements about
    * non-recursive locks are true this should not be a problem.
    * One issue that arises with this only lock when needed
    * is that if an implicit association setup is done we
    * have a problem. If at the time I lookup an association
    * I have NULL in the tcb return, by the time I call to
    * create the association some other processor could
    * have created it. This is what the CREATE lock on
    * the endpoint. Places where we will be implicitly
    * creating the association OR just creating an association
    * (the connect call) will assert the CREATE_INP lock. This
    * will assure us that during all the lookup of INP and INFO
    * if another creator is also locking/looking up we can
    * gate the two to synchronize. So the CREATE_INP lock is
    * also another one we must use extreme caution in locking
    * to make sure we don't hit a re-entrancy issue.
    *
    * For non FreeBSD 5.x and above we provide a bunch
    * of EMPTY lock macro's so we can blatantly put locks
    * everywhere and they reduce to nothing on NetBSD/OpenBSD
    * and FreeBSD 4.x
    *
    */
   
   
   /* When working with the global SCTP lists we lock and unlock
    * the INP_INFO lock. So when we go to lookup an association
    * we will want to do a SCTP_INP_INFO_RLOCK() and then when
    * we want to add a new association to the sctppcbinfo list's
    * we will do a SCTP_INP_INFO_WLOCK().
    */
   
   /*
    * FIX ME, all locks right now have a
    * recursive check/panic to validate that I
    * don't have any lock recursion going on.
    */
   
   #define SCTP_INP_INFO_LOCK_INIT() \
           mtx_init(&sctppcbinfo.ipi_ep_mtx, "sctp", "inp_info", MTX_DEF)
   
   #ifdef xyzzy
   #define SCTP_INP_INFO_RLOCK()   do {                                    \
                if (mtx_owned(&sctppcbinfo.ipi_ep_mtx))                     \
                   panic("INP INFO Recursive Lock-R");                     \
                mtx_lock(&sctppcbinfo.ipi_ep_mtx);                         \
   } while (0)
   
   #define SCTP_INP_INFO_WLOCK()   do {                                    \
                if (mtx_owned(&sctppcbinfo.ipi_ep_mtx))                     \
                   panic("INP INFO Recursive Lock-W");                     \
                mtx_lock(&sctppcbinfo.ipi_ep_mtx);                         \
   } while (0)
   
   #else
   
   void SCTP_INP_INFO_RLOCK(void);
   void SCTP_INP_INFO_WLOCK(void);
   
   #endif
   
   #define SCTP_INP_INFO_RUNLOCK()         mtx_unlock(&sctppcbinfo.ipi_ep_mtx)
   #define SCTP_INP_INFO_WUNLOCK()         mtx_unlock(&sctppcbinfo.ipi_ep_mtx)
   
   /* The INP locks we will use for locking an SCTP endpoint, so for
    * example if we want to change something at the endpoint level for
    * example cookie secrets we lock the INP level.
    */
   #define SCTP_INP_LOCK_INIT(_inp) \
           mtx_init(&(_inp)->inp_mtx, "sctp", "inp", MTX_DEF | MTX_DUPOK)
   
   #define SCTP_ASOC_CREATE_LOCK_INIT(_inp) \
           mtx_init(&(_inp)->inp_create_mtx, "sctp", "inp_create", \
                    MTX_DEF | MTX_DUPOK)
   
   #define SCTP_INP_LOCK_DESTROY(_inp)     mtx_destroy(&(_inp)->inp_mtx)
   #define SCTP_ASOC_CREATE_LOCK_DESTROY(_inp)     mtx_destroy(&(_inp)->inp_create_mtx)
   
   #ifdef xyzzy
   #define SCTP_INP_RLOCK(_inp)    do {                                    \
           struct sctp_tcb *xx_stcb;                                       \
           xx_stcb = LIST_FIRST(&_inp->sctp_asoc_list);                    \
           if (xx_stcb)                                                     \
                 if (mtx_owned(&(xx_stcb)->tcb_mtx))                        \
                        panic("I own TCB lock?");                          \
           if (mtx_owned(&(_inp)->inp_mtx))                                 \
                   panic("INP Recursive Lock-R");                          \
           mtx_lock(&(_inp)->inp_mtx);                                     \
   } while (0)
   
   #define SCTP_INP_WLOCK(_inp)    do {                                    \
           struct sctp_tcb *xx_stcb;                                       \
           xx_stcb = LIST_FIRST(&_inp->sctp_asoc_list);                    \
           if (xx_stcb)                                                     \
                 if (mtx_owned(&(xx_stcb)->tcb_mtx))                        \
                        panic("I own TCB lock?");                          \
           if (mtx_owned(&(_inp)->inp_mtx))                                 \
                   panic("INP Recursive Lock-W");                          \
           mtx_lock(&(_inp)->inp_mtx);                                     \
   } while (0)
   
   #else
   void SCTP_INP_RLOCK(struct sctp_inpcb *);
   void SCTP_INP_WLOCK(struct sctp_inpcb *);
   
   #endif
   
   
   #define SCTP_INP_INCR_REF(_inp)        _inp->refcount++
   
   #define SCTP_INP_DECR_REF(_inp)         do {                                 \
                                                if (_inp->refcount > 0)          \
                                                     _inp->refcount--;          \
                                                else                            \
                                                     panic("bad inp refcount"); \
   }while (0)
   
   #define SCTP_ASOC_CREATE_LOCK(_inp)  do {                               \
           if (mtx_owned(&(_inp)->inp_create_mtx))                          \
                   panic("INP Recursive CREATE");                          \
           mtx_lock(&(_inp)->inp_create_mtx);                              \
   } while (0)
   
   #define SCTP_INP_RUNLOCK(_inp)          mtx_unlock(&(_inp)->inp_mtx)
   #define SCTP_INP_WUNLOCK(_inp)          mtx_unlock(&(_inp)->inp_mtx)
   #define SCTP_ASOC_CREATE_UNLOCK(_inp)   mtx_unlock(&(_inp)->inp_create_mtx)
   
   /* For the majority of things (once we have found the association) we
    * will lock the actual association mutex. This will protect all
    * the assoiciation level queues and streams and such. We will
    * need to lock the socket layer when we stuff data up into
    * the receiving sb_mb. I.e. we will need to do an extra
    * SOCKBUF_LOCK(&so->so_rcv) even though the association is
    * locked.
    */
   
   #define SCTP_TCB_LOCK_INIT(_tcb) \
           mutex_init(&(_tcb)->tcb_mtx, MUTEX_DEFAULT, IPL_NET)
   #define SCTP_TCB_LOCK_DESTROY(_tcb)     mtx_destroy(&(_tcb)->tcb_mtx)
   #define SCTP_TCB_LOCK(_tcb)  do {                                       \
           if (!mtx_owned(&(_tcb->sctp_ep->inp_mtx)))                       \
                   panic("TCB locking and no INP lock");                   \
           if (mtx_owned(&(_tcb)->tcb_mtx))                                 \
                   panic("TCB Lock-recursive");                            \
           mtx_lock(&(_tcb)->tcb_mtx);                                     \
   } while (0)
   #define SCTP_TCB_UNLOCK(_tcb)           mtx_unlock(&(_tcb)->tcb_mtx)
   
   #define SCTP_ITERATOR_LOCK_INIT() \
           mtx_init(&sctppcbinfo.it_mtx, "sctp", "iterator", MTX_DEF)
   #define SCTP_ITERATOR_LOCK()  do {                                      \
           if (mtx_owned(&sctppcbinfo.it_mtx))                              \
                   panic("Iterator Lock");                                 \
           mtx_lock(&sctppcbinfo.it_mtx);                                  \
   } while (0)
   
   #define SCTP_ITERATOR_UNLOCK()          mtx_unlock(&sctppcbinfo.it_mtx)
   #define SCTP_ITERATOR_LOCK_DESTROY()    mtx_destroy(&sctppcbinfo.it_mtx)
   #elif 0 /* defined(__NetBSD__) */
   #define SCTP_INP_INFO_LOCK_INIT() \
           rw_init(&sctppcbinfo.ipi_ep_mtx)
   
   #define SCTP_INP_INFO_RLOCK()   do {                                    \
                   rw_enter(&sctppcbinfo.ipi_ep_mtx, RW_READER);           \
   } while (0)
   
   #define SCTP_INP_INFO_WLOCK()   do {                                    \
                rw_enter(&sctppcbinfo.ipi_ep_mtx, RW_WRITER);              \
   } while (0)
   
   #define SCTP_INP_INFO_RUNLOCK()         rw_exit(&sctppcbinfo.ipi_ep_mtx)
   #define SCTP_INP_INFO_WUNLOCK()         rw_exit(&sctppcbinfo.ipi_ep_mtx)
   
   /* The INP locks we will use for locking an SCTP endpoint, so for
    * example if we want to change something at the endpoint level for
    * example cookie secrets we lock the INP level.
    */
   #define SCTP_INP_LOCK_INIT(_inp) \
           mutex_init(&(_inp)->inp_mtx, MUTEX_DEFAULT, IPL_NET)
   
   #define SCTP_ASOC_CREATE_LOCK_INIT(_inp) \
           mutex_init(&(_inp)->inp_create_mtx, MUTEX_DEFAULT, IPL_NET)
   
   #define SCTP_INP_LOCK_DESTROY(_inp)     mutex_destroy(&(_inp)->inp_mtx)
   #define SCTP_ASOC_CREATE_LOCK_DESTROY(_inp)     mutex_destroy(&(_inp)->inp_create_mtx)
   
   #define SCTP_INP_RLOCK(_inp)    do {                                    \
           mutex_enter(&(_inp)->inp_mtx);                                  \
   } while (0)
   
   #define SCTP_INP_WLOCK(_inp)    do {                                    \
           mutex_enter(&(_inp)->inp_mtx);                                  \
   } while (0)
   
   
   #define SCTP_INP_INCR_REF(_inp) atomic_add_int(&((_inp)->refcount), 1)
   
   #define SCTP_INP_DECR_REF(_inp) atomic_add_int(&((_inp)->refcount), -1)
   
   #define SCTP_ASOC_CREATE_LOCK(_inp)  do {                               \
           mutex_enter(&(_inp)->inp_create_mtx);                              \
   } while (0)
   
   #define SCTP_INP_RUNLOCK(_inp)          mutex_exit(&(_inp)->inp_mtx)
   #define SCTP_INP_WUNLOCK(_inp)          mutex_exit(&(_inp)->inp_mtx)
   #define SCTP_ASOC_CREATE_UNLOCK(_inp)   mutex_exit(&(_inp)->inp_create_mtx)
   
   /* For the majority of things (once we have found the association) we
    * will lock the actual association mutex. This will protect all
    * the assoiciation level queues and streams and such. We will
    * need to lock the socket layer when we stuff data up into
    * the receiving sb_mb. I.e. we will need to do an extra
    * SOCKBUF_LOCK(&so->so_rcv) even though the association is
    * locked.
    */
   
   #define SCTP_TCB_LOCK_INIT(_tcb) \
           mutex_init(&(_tcb)->tcb_mtx, MUTEX_DEFAULT, IPL_NET)
   #define SCTP_TCB_LOCK_DESTROY(_tcb)     mutex_destroy(&(_tcb)->tcb_mtx)
   #define SCTP_TCB_LOCK(_tcb)  do {                                       \
           mutex_enter(&(_tcb)->tcb_mtx);                                     \
   } while (0)
   #define SCTP_TCB_UNLOCK(_tcb)           mutex_exit(&(_tcb)->tcb_mtx)
   
   #define SCTP_ITERATOR_LOCK_INIT() \
           mutex_init(&sctppcbinfo.it_mtx, MUTEX_DEFAULT, IPL_NET)
   #define SCTP_ITERATOR_LOCK()  do {                                      \
           if (mutex_owned(&sctppcbinfo.it_mtx))                           \
                   panic("Iterator Lock");                                 \
           mutex_enter(&sctppcbinfo.it_mtx);                               \
   } while (0)
   
   #define SCTP_ITERATOR_UNLOCK()          mutex_exit(&sctppcbinfo.it_mtx)
   #define SCTP_ITERATOR_LOCK_DESTROY()    mutex_destroy(&sctppcbinfo.it_mtx)
   #else
   
   /* Empty Lock declarations for all other
    * platforms pre-process away to nothing.
    */
   
   /* Lock for INFO stuff */
   #define SCTP_INP_INFO_LOCK_INIT()
   #define SCTP_INP_INFO_RLOCK()
   #define SCTP_INP_INFO_RLOCK()
   #define SCTP_INP_INFO_WLOCK()
   
   #define SCTP_INP_INFO_RUNLOCK()
   #define SCTP_INP_INFO_WUNLOCK()
   /* Lock for INP */
   #define SCTP_INP_LOCK_INIT(_inp)
   #define SCTP_INP_LOCK_DESTROY(_inp)
   #define SCTP_INP_RLOCK(_inp)
   #define SCTP_INP_RUNLOCK(_inp)
   #define SCTP_INP_WLOCK(_inp)
   #define SCTP_INP_INCR_REF(_inp)
   #define SCTP_INP_DECR_REF(_inp)
   #define SCTP_INP_WUNLOCK(_inp)
   #define SCTP_ASOC_CREATE_LOCK_INIT(_inp)
   #define SCTP_ASOC_CREATE_LOCK_DESTROY(_inp)
   #define SCTP_ASOC_CREATE_LOCK(_inp)
   #define SCTP_ASOC_CREATE_UNLOCK(_inp)
   /* Lock for TCB */
   #define SCTP_TCB_LOCK_INIT(_tcb)
   #define SCTP_TCB_LOCK_DESTROY(_tcb)
   #define SCTP_TCB_LOCK(_tcb)
   #define SCTP_TCB_UNLOCK(_tcb)
   /* iterator locks */
   #define SCTP_ITERATOR_LOCK_INIT()
   #define SCTP_ITERATOR_LOCK()
   #define SCTP_ITERATOR_UNLOCK()
   #define SCTP_ITERATOR_LOCK_DESTROY()
   #endif
   
   #if defined(_KERNEL)
   
   extern struct sctp_epinfo sctppcbinfo;
   extern int sctp_auto_asconf;
   
   int SCTP6_ARE_ADDR_EQUAL(const struct in6_addr *a, const struct in6_addr *b);
   
   void sctp_fill_pcbinfo(struct sctp_pcbinfo *);
   
   struct sctp_nets *sctp_findnet(struct sctp_tcb *, struct sockaddr *);
   
   struct sctp_inpcb *sctp_pcb_findep(struct sockaddr *, int, int);
   
   int sctp_inpcb_bind(struct socket *, struct sockaddr *, struct lwp *);
   
   struct sctp_tcb *sctp_findassociation_addr(struct mbuf *, int, int,
       struct sctphdr *, struct sctp_chunkhdr *, struct sctp_inpcb **,
       struct sctp_nets **);
   
   struct sctp_tcb *sctp_findassociation_addr_sa(struct sockaddr *,
           struct sockaddr *, struct sctp_inpcb **, struct sctp_nets **, int);
   
   void sctp_move_pcb_and_assoc(struct sctp_inpcb *, struct sctp_inpcb *,
           struct sctp_tcb *);
   
   /*
    * For this call ep_addr, the to is the destination endpoint address
    * of the peer (relative to outbound). The from field is only used if
    * the TCP model is enabled and helps distingush amongst the subset
    * bound (non-boundall). The TCP model MAY change the actual ep field,
    * this is why it is passed.
    */
   struct sctp_tcb *sctp_findassociation_ep_addr(struct sctp_inpcb **,
           struct sockaddr *, struct sctp_nets **, struct sockaddr *, struct sctp_tcb *);
   
   struct sctp_tcb *sctp_findassociation_ep_asocid(struct sctp_inpcb *, vaddr_t);
   
   struct sctp_tcb *sctp_findassociation_ep_asconf(struct mbuf *, int, int,
       struct sctphdr *, struct sctp_inpcb **, struct sctp_nets **);
   
   int sctp_inpcb_alloc(struct socket *);
   
   
   int sctp_is_address_on_local_host(struct sockaddr *addr);
   
   void sctp_inpcb_free(struct sctp_inpcb *, int);
   
   struct sctp_tcb *sctp_aloc_assoc(struct sctp_inpcb *, struct sockaddr *,
           int, int *, uint32_t);
   
   void sctp_free_assoc(struct sctp_inpcb *, struct sctp_tcb *);
   
   int sctp_add_local_addr_ep(struct sctp_inpcb *, struct ifaddr *);
   
   int sctp_insert_laddr(struct sctpladdr *, struct ifaddr *);
   
   void sctp_remove_laddr(struct sctp_laddr *);
   
   int sctp_del_local_addr_ep(struct sctp_inpcb *, struct ifaddr *);
   
   int sctp_del_local_addr_ep_sa(struct sctp_inpcb *, struct sockaddr *);
   
   int sctp_add_remote_addr(struct sctp_tcb *, struct sockaddr *, int, int);
   
   int sctp_del_remote_addr(struct sctp_tcb *, struct sockaddr *);
   
   void sctp_pcb_init(void);
   
   void sctp_free_remote_addr(struct sctp_nets *);
   
   int sctp_add_local_addr_assoc(struct sctp_tcb *, struct ifaddr *);
   
   int sctp_del_local_addr_assoc(struct sctp_tcb *, struct ifaddr *);
   
   int sctp_del_local_addr_assoc_sa(struct sctp_tcb *, struct sockaddr *);
   
   int sctp_load_addresses_from_init(struct sctp_tcb *, struct mbuf *, int, int,
       int, struct sctphdr *, struct sockaddr *);
   
   int sctp_set_primary_addr(struct sctp_tcb *, struct sockaddr *, struct sctp_nets *);
   
   int sctp_is_vtag_good(struct sctp_inpcb *, uint32_t, struct timeval *);
   
   /*void sctp_drain(void);*/
   
   int sctp_destination_is_reachable(struct sctp_tcb *, const struct sockaddr *);
   
   int sctp_add_to_socket_q(struct sctp_inpcb *, struct sctp_tcb *);
   
   struct sctp_tcb *sctp_remove_from_socket_q(struct sctp_inpcb *);
   
   
   /* Null in last arg inpcb indicate run on ALL ep's. Specific
    * inp in last arg indicates run on ONLY assoc's of the
    * specified endpoint.
    */
   int
   sctp_initiate_iterator(asoc_func af, uint32_t, uint32_t, void *, uint32_t,
                          end_func ef, struct sctp_inpcb *);
   
   void in6_sin6_2_sin (struct sockaddr_in *,
                               struct sockaddr_in6 *sin6);
   
   #ifdef __NetBSD__
   #ifndef sotoin6pcb
   #define sotoin6pcb(so)  ((struct in6pcb *)((so)->so_pcb))
   #endif
   #ifndef in6p_flags
   #define in6p_flags      in6p_pcb.inp_flags
   #endif
   #ifndef in6p_af
   #define in6p_af         in6p_pcb.inp_af
   #endif
   #ifndef inpcb_hdr
   #define inpcb_hdr       inpcb
   #endif
   #ifndef sp_inph
   #define sp_inph         sp_inp
   #endif
   #endif
   
   #endif /* _KERNEL */
   #endif /* !__SCTP_PCB_H__ */

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