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

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    1 #ifndef __sctp_lock_bsd_h__
    2 #define __sctp_lock_bsd_h__
    3 /*-
    4  * Copyright (c) 2001-2007, by Cisco Systems, Inc. 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 /*
   34  * General locking concepts: The goal of our locking is to of course provide
   35  * consistency and yet minimize overhead. We will attempt to use
   36  * non-recursive locks which are supposed to be quite inexpensive. Now in
   37  * order to do this the goal is that most functions are not aware of locking.
   38  * Once we have a TCB we lock it and unlock when we are through. This means
   39  * that the TCB lock is kind-of a "global" lock when working on an
   40  * association. Caution must be used when asserting a TCB_LOCK since if we
   41  * recurse we deadlock.
   42  *
   43  * Most other locks (INP and INFO) attempt to localize the locking i.e. we try
   44  * to contain the lock and unlock within the function that needs to lock it.
   45  * This sometimes mean we do extra locks and unlocks and lose a bit of
   46  * efficency, but if the performance statements about non-recursive locks are
   47  * true this should not be a problem.  One issue that arises with this only
   48  * lock when needed is that if an implicit association setup is done we have
   49  * a problem. If at the time I lookup an association I have NULL in the tcb
   50  * return, by the time I call to create the association some other processor
   51  * could have created it. This is what the CREATE lock on the endpoint.
   52  * Places where we will be implicitly creating the association OR just
   53  * creating an association (the connect call) will assert the CREATE_INP
   54  * lock. This will assure us that during all the lookup of INP and INFO if
   55  * another creator is also locking/looking up we can gate the two to
   56  * synchronize. So the CREATE_INP lock is also another one we must use
   57  * extreme caution in locking to make sure we don't hit a re-entrancy issue.
   58  *
   59  * For non FreeBSD 5.x we provide a bunch of EMPTY lock macros so we can
   60  * blatantly put locks everywhere and they reduce to nothing on
   61  * NetBSD/OpenBSD and FreeBSD 4.x
   62  *
   63  */
   64 
   65 /*
   66  * When working with the global SCTP lists we lock and unlock the INP_INFO
   67  * lock. So when we go to lookup an association we will want to do a
   68  * SCTP_INP_INFO_RLOCK() and then when we want to add a new association to
   69  * the SCTP_BASE_INFO() list's we will do a SCTP_INP_INFO_WLOCK().
   70  */
   71 #include <sys/cdefs.h>
   72 __FBSDID("$FreeBSD: releng/8.2/sys/netinet/sctp_lock_bsd.h 209028 2010-06-11 03:13:19Z rrs $");
   73 
   74 
   75 extern struct sctp_foo_stuff sctp_logoff[];
   76 extern int sctp_logoff_stuff;
   77 
   78 #define SCTP_IPI_COUNT_INIT()
   79 
   80 #define SCTP_STATLOG_INIT_LOCK()
   81 #define SCTP_STATLOG_LOCK()
   82 #define SCTP_STATLOG_UNLOCK()
   83 #define SCTP_STATLOG_DESTROY()
   84 
   85 #define SCTP_INP_INFO_LOCK_DESTROY() do { \
   86         if(rw_wowned(&SCTP_BASE_INFO(ipi_ep_mtx))) { \
   87              rw_wunlock(&SCTP_BASE_INFO(ipi_ep_mtx)); \
   88         } \
   89         rw_destroy(&SCTP_BASE_INFO(ipi_ep_mtx)); \
   90       }  while (0)
   91 
   92 #define SCTP_INP_INFO_LOCK_INIT() \
   93         rw_init(&SCTP_BASE_INFO(ipi_ep_mtx), "sctp-info");
   94 
   95 
   96 #define SCTP_INP_INFO_RLOCK()   do {                                    \
   97              rw_rlock(&SCTP_BASE_INFO(ipi_ep_mtx));                         \
   98 } while (0)
   99 
  100 
  101 #define SCTP_INP_INFO_WLOCK()   do {                                    \
  102             rw_wlock(&SCTP_BASE_INFO(ipi_ep_mtx));                         \
  103 } while (0)
  104 
  105 
  106 #define SCTP_INP_INFO_RUNLOCK()         rw_runlock(&SCTP_BASE_INFO(ipi_ep_mtx))
  107 #define SCTP_INP_INFO_WUNLOCK()         rw_wunlock(&SCTP_BASE_INFO(ipi_ep_mtx))
  108 
  109 
  110 #define SCTP_IPI_ADDR_INIT()                                                            \
  111         rw_init(&SCTP_BASE_INFO(ipi_addr_mtx), "sctp-addr")
  112 #define SCTP_IPI_ADDR_DESTROY() do  { \
  113         if(rw_wowned(&SCTP_BASE_INFO(ipi_addr_mtx))) { \
  114              rw_wunlock(&SCTP_BASE_INFO(ipi_addr_mtx)); \
  115         } \
  116         rw_destroy(&SCTP_BASE_INFO(ipi_addr_mtx)); \
  117       }  while (0)
  118 #define SCTP_IPI_ADDR_RLOCK()   do {                                    \
  119              rw_rlock(&SCTP_BASE_INFO(ipi_addr_mtx));                         \
  120 } while (0)
  121 #define SCTP_IPI_ADDR_WLOCK()   do {                                    \
  122              rw_wlock(&SCTP_BASE_INFO(ipi_addr_mtx));                         \
  123 } while (0)
  124 
  125 #define SCTP_IPI_ADDR_RUNLOCK()         rw_runlock(&SCTP_BASE_INFO(ipi_addr_mtx))
  126 #define SCTP_IPI_ADDR_WUNLOCK()         rw_wunlock(&SCTP_BASE_INFO(ipi_addr_mtx))
  127 
  128 
  129 #define SCTP_IPI_ITERATOR_WQ_INIT() \
  130         mtx_init(&sctp_it_ctl.ipi_iterator_wq_mtx, "sctp-it-wq", "sctp_it_wq", MTX_DEF)
  131 
  132 #define SCTP_IPI_ITERATOR_WQ_DESTROY() \
  133         mtx_destroy(&sctp_it_ctl.ipi_iterator_wq_mtx)
  134 
  135 #define SCTP_IPI_ITERATOR_WQ_LOCK()     do {                                    \
  136              mtx_lock(&sctp_it_ctl.ipi_iterator_wq_mtx);                \
  137 } while (0)
  138 
  139 #define SCTP_IPI_ITERATOR_WQ_UNLOCK()           mtx_unlock(&sctp_it_ctl.ipi_iterator_wq_mtx)
  140 
  141 
  142 #define SCTP_IP_PKTLOG_INIT() \
  143         mtx_init(&SCTP_BASE_INFO(ipi_pktlog_mtx), "sctp-pktlog", "packetlog", MTX_DEF)
  144 
  145 
  146 #define SCTP_IP_PKTLOG_LOCK()   do {                    \
  147              mtx_lock(&SCTP_BASE_INFO(ipi_pktlog_mtx));     \
  148 } while (0)
  149 
  150 #define SCTP_IP_PKTLOG_UNLOCK() mtx_unlock(&SCTP_BASE_INFO(ipi_pktlog_mtx))
  151 
  152 #define SCTP_IP_PKTLOG_DESTROY() \
  153         mtx_destroy(&SCTP_BASE_INFO(ipi_pktlog_mtx))
  154 
  155 
  156 
  157 
  158 
  159 /*
  160  * The INP locks we will use for locking an SCTP endpoint, so for example if
  161  * we want to change something at the endpoint level for example random_store
  162  * or cookie secrets we lock the INP level.
  163  */
  164 
  165 #define SCTP_INP_READ_INIT(_inp) \
  166         mtx_init(&(_inp)->inp_rdata_mtx, "sctp-read", "inpr", MTX_DEF | MTX_DUPOK)
  167 
  168 #define SCTP_INP_READ_DESTROY(_inp) \
  169         mtx_destroy(&(_inp)->inp_rdata_mtx)
  170 
  171 #define SCTP_INP_READ_LOCK(_inp)        do { \
  172         mtx_lock(&(_inp)->inp_rdata_mtx);    \
  173 } while (0)
  174 
  175 
  176 #define SCTP_INP_READ_UNLOCK(_inp) mtx_unlock(&(_inp)->inp_rdata_mtx)
  177 
  178 
  179 #define SCTP_INP_LOCK_INIT(_inp) \
  180         mtx_init(&(_inp)->inp_mtx, "sctp-inp", "inp", MTX_DEF | MTX_DUPOK)
  181 #define SCTP_ASOC_CREATE_LOCK_INIT(_inp) \
  182         mtx_init(&(_inp)->inp_create_mtx, "sctp-create", "inp_create", \
  183                  MTX_DEF | MTX_DUPOK)
  184 
  185 #define SCTP_INP_LOCK_DESTROY(_inp) \
  186         mtx_destroy(&(_inp)->inp_mtx)
  187 
  188 #define SCTP_INP_LOCK_CONTENDED(_inp) ((_inp)->inp_mtx.mtx_lock & MTX_CONTESTED)
  189 
  190 #define SCTP_INP_READ_CONTENDED(_inp) ((_inp)->inp_rdata_mtx.mtx_lock & MTX_CONTESTED)
  191 
  192 #define SCTP_ASOC_CREATE_LOCK_CONTENDED(_inp) ((_inp)->inp_create_mtx.mtx_lock & MTX_CONTESTED)
  193 
  194 
  195 #define SCTP_ASOC_CREATE_LOCK_DESTROY(_inp) \
  196         mtx_destroy(&(_inp)->inp_create_mtx)
  197 
  198 
  199 #ifdef SCTP_LOCK_LOGGING
  200 #define SCTP_INP_RLOCK(_inp)    do {                                    \
  201         if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_INP);\
  202         mtx_lock(&(_inp)->inp_mtx);                                     \
  203 } while (0)
  204 
  205 #define SCTP_INP_WLOCK(_inp)    do {                                    \
  206         if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_INP);\
  207         mtx_lock(&(_inp)->inp_mtx);                                     \
  208 } while (0)
  209 
  210 #else
  211 
  212 #define SCTP_INP_RLOCK(_inp)    do {                                    \
  213         mtx_lock(&(_inp)->inp_mtx);                                     \
  214 } while (0)
  215 
  216 #define SCTP_INP_WLOCK(_inp)    do {                                    \
  217         mtx_lock(&(_inp)->inp_mtx);                                     \
  218 } while (0)
  219 
  220 #endif
  221 
  222 
  223 #define SCTP_TCB_SEND_LOCK_INIT(_tcb) \
  224         mtx_init(&(_tcb)->tcb_send_mtx, "sctp-send-tcb", "tcbs", MTX_DEF | MTX_DUPOK)
  225 
  226 #define SCTP_TCB_SEND_LOCK_DESTROY(_tcb) mtx_destroy(&(_tcb)->tcb_send_mtx)
  227 
  228 #define SCTP_TCB_SEND_LOCK(_tcb)  do { \
  229         mtx_lock(&(_tcb)->tcb_send_mtx); \
  230 } while (0)
  231 
  232 #define SCTP_TCB_SEND_UNLOCK(_tcb) mtx_unlock(&(_tcb)->tcb_send_mtx)
  233 
  234 #define SCTP_INP_INCR_REF(_inp) atomic_add_int(&((_inp)->refcount), 1)
  235 #define SCTP_INP_DECR_REF(_inp) atomic_add_int(&((_inp)->refcount), -1)
  236 
  237 
  238 #ifdef SCTP_LOCK_LOGGING
  239 #define SCTP_ASOC_CREATE_LOCK(_inp) \
  240         do {                                                            \
  241         if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_CREATE); \
  242                 mtx_lock(&(_inp)->inp_create_mtx);                      \
  243         } while (0)
  244 #else
  245 
  246 #define SCTP_ASOC_CREATE_LOCK(_inp) \
  247         do {                                                            \
  248                 mtx_lock(&(_inp)->inp_create_mtx);                      \
  249         } while (0)
  250 #endif
  251 
  252 #define SCTP_INP_RUNLOCK(_inp)          mtx_unlock(&(_inp)->inp_mtx)
  253 #define SCTP_INP_WUNLOCK(_inp)          mtx_unlock(&(_inp)->inp_mtx)
  254 #define SCTP_ASOC_CREATE_UNLOCK(_inp)   mtx_unlock(&(_inp)->inp_create_mtx)
  255 
  256 /*
  257  * For the majority of things (once we have found the association) we will
  258  * lock the actual association mutex. This will protect all the assoiciation
  259  * level queues and streams and such. We will need to lock the socket layer
  260  * when we stuff data up into the receiving sb_mb. I.e. we will need to do an
  261  * extra SOCKBUF_LOCK(&so->so_rcv) even though the association is locked.
  262  */
  263 
  264 #define SCTP_TCB_LOCK_INIT(_tcb) \
  265         mtx_init(&(_tcb)->tcb_mtx, "sctp-tcb", "tcb", MTX_DEF | MTX_DUPOK)
  266 
  267 #define SCTP_TCB_LOCK_DESTROY(_tcb)     mtx_destroy(&(_tcb)->tcb_mtx)
  268 
  269 #ifdef SCTP_LOCK_LOGGING
  270 #define SCTP_TCB_LOCK(_tcb)  do {                                       \
  271         if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE)  sctp_log_lock(_tcb->sctp_ep, _tcb, SCTP_LOG_LOCK_TCB);          \
  272         mtx_lock(&(_tcb)->tcb_mtx);                                     \
  273 } while (0)
  274 
  275 #else
  276 #define SCTP_TCB_LOCK(_tcb)  do {                                       \
  277         mtx_lock(&(_tcb)->tcb_mtx);                                     \
  278 } while (0)
  279 
  280 #endif
  281 
  282 
  283 #define SCTP_TCB_TRYLOCK(_tcb)  mtx_trylock(&(_tcb)->tcb_mtx)
  284 
  285 #define SCTP_TCB_UNLOCK(_tcb)           mtx_unlock(&(_tcb)->tcb_mtx)
  286 
  287 #define SCTP_TCB_UNLOCK_IFOWNED(_tcb)         do { \
  288                                                 if (mtx_owned(&(_tcb)->tcb_mtx)) \
  289                                                      mtx_unlock(&(_tcb)->tcb_mtx); \
  290                                               } while (0)
  291 
  292 
  293 
  294 #ifdef INVARIANTS
  295 #define SCTP_TCB_LOCK_ASSERT(_tcb) do { \
  296                             if (mtx_owned(&(_tcb)->tcb_mtx) == 0) \
  297                                 panic("Don't own TCB lock"); \
  298                             } while (0)
  299 #else
  300 #define SCTP_TCB_LOCK_ASSERT(_tcb)
  301 #endif
  302 
  303 #define SCTP_ITERATOR_LOCK_INIT() \
  304         mtx_init(&sctp_it_ctl.it_mtx, "sctp-it", "iterator", MTX_DEF)
  305 
  306 #ifdef INVARIANTS
  307 #define SCTP_ITERATOR_LOCK() \
  308         do {                                                            \
  309                 if (mtx_owned(&sctp_it_ctl.it_mtx))                     \
  310                         panic("Iterator Lock");                         \
  311                 mtx_lock(&sctp_it_ctl.it_mtx);                          \
  312         } while (0)
  313 #else
  314 #define SCTP_ITERATOR_LOCK() \
  315         do {                                                            \
  316                 mtx_lock(&sctp_it_ctl.it_mtx);                          \
  317         } while (0)
  318 
  319 #endif
  320 
  321 #define SCTP_ITERATOR_UNLOCK()          mtx_unlock(&sctp_it_ctl.it_mtx)
  322 #define SCTP_ITERATOR_LOCK_DESTROY()    mtx_destroy(&sctp_it_ctl.it_mtx)
  323 
  324 
  325 #define SCTP_WQ_ADDR_INIT() do { \
  326         mtx_init(&SCTP_BASE_INFO(wq_addr_mtx), "sctp-addr-wq","sctp_addr_wq",MTX_DEF); \
  327  } while (0)
  328 
  329 #define SCTP_WQ_ADDR_DESTROY() do  { \
  330         if(mtx_owned(&SCTP_BASE_INFO(wq_addr_mtx))) { \
  331              mtx_unlock(&SCTP_BASE_INFO(wq_addr_mtx)); \
  332         } \
  333             mtx_destroy(&SCTP_BASE_INFO(wq_addr_mtx)); \
  334       }  while (0)
  335 
  336 #define SCTP_WQ_ADDR_LOCK()     do { \
  337              mtx_lock(&SCTP_BASE_INFO(wq_addr_mtx));  \
  338 } while (0)
  339 #define SCTP_WQ_ADDR_UNLOCK() do { \
  340                 mtx_unlock(&SCTP_BASE_INFO(wq_addr_mtx)); \
  341 } while (0)
  342 
  343 
  344 
  345 #define SCTP_INCR_EP_COUNT() \
  346                 do { \
  347                        atomic_add_int(&SCTP_BASE_INFO(ipi_count_ep), 1); \
  348                 } while (0)
  349 
  350 #define SCTP_DECR_EP_COUNT() \
  351                 do { \
  352                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_ep), 1); \
  353                 } while (0)
  354 
  355 #define SCTP_INCR_ASOC_COUNT() \
  356                 do { \
  357                        atomic_add_int(&SCTP_BASE_INFO(ipi_count_asoc), 1); \
  358                 } while (0)
  359 
  360 #define SCTP_DECR_ASOC_COUNT() \
  361                 do { \
  362                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_asoc), 1); \
  363                 } while (0)
  364 
  365 #define SCTP_INCR_LADDR_COUNT() \
  366                 do { \
  367                        atomic_add_int(&SCTP_BASE_INFO(ipi_count_laddr), 1); \
  368                 } while (0)
  369 
  370 #define SCTP_DECR_LADDR_COUNT() \
  371                 do { \
  372                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_laddr), 1); \
  373                 } while (0)
  374 
  375 #define SCTP_INCR_RADDR_COUNT() \
  376                 do { \
  377                        atomic_add_int(&SCTP_BASE_INFO(ipi_count_raddr), 1); \
  378                 } while (0)
  379 
  380 #define SCTP_DECR_RADDR_COUNT() \
  381                 do { \
  382                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_raddr),1); \
  383                 } while (0)
  384 
  385 #define SCTP_INCR_CHK_COUNT() \
  386                 do { \
  387                        atomic_add_int(&SCTP_BASE_INFO(ipi_count_chunk), 1); \
  388                 } while (0)
  389 #ifdef INVARIANTS
  390 #define SCTP_DECR_CHK_COUNT() \
  391                 do { \
  392                        if(SCTP_BASE_INFO(ipi_count_chunk) == 0) \
  393                              panic("chunk count to 0?");    \
  394                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_chunk), 1); \
  395                 } while (0)
  396 #else
  397 #define SCTP_DECR_CHK_COUNT() \
  398                 do { \
  399                        if(SCTP_BASE_INFO(ipi_count_chunk) != 0) \
  400                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_chunk), 1); \
  401                 } while (0)
  402 #endif
  403 #define SCTP_INCR_READQ_COUNT() \
  404                 do { \
  405                        atomic_add_int(&SCTP_BASE_INFO(ipi_count_readq),1); \
  406                 } while (0)
  407 
  408 #define SCTP_DECR_READQ_COUNT() \
  409                 do { \
  410                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_readq), 1); \
  411                 } while (0)
  412 
  413 #define SCTP_INCR_STRMOQ_COUNT() \
  414                 do { \
  415                        atomic_add_int(&SCTP_BASE_INFO(ipi_count_strmoq), 1); \
  416                 } while (0)
  417 
  418 #define SCTP_DECR_STRMOQ_COUNT() \
  419                 do { \
  420                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_strmoq), 1); \
  421                 } while (0)
  422 
  423 
  424 #if defined(SCTP_SO_LOCK_TESTING)
  425 #define SCTP_INP_SO(sctpinp)    (sctpinp)->ip_inp.inp.inp_socket
  426 #define SCTP_SOCKET_LOCK(so, refcnt)
  427 #define SCTP_SOCKET_UNLOCK(so, refcnt)
  428 #endif
  429 
  430 #endif

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