The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/rpc/replay.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
    5  * Authors: Doug Rabson <dfr@rabson.org>
    6  * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include <sys/param.h>
   34 #include <sys/hash.h>
   35 #include <sys/kernel.h>
   36 #include <sys/lock.h>
   37 #include <sys/malloc.h>
   38 #include <sys/mbuf.h>
   39 #include <sys/mutex.h>
   40 #include <sys/queue.h>
   41 
   42 #include <rpc/rpc.h>
   43 #include <rpc/replay.h>
   44 
   45 struct replay_cache_entry {
   46         int             rce_hash;
   47         struct rpc_msg  rce_msg;
   48         struct sockaddr_storage rce_addr;
   49         struct rpc_msg  rce_repmsg;
   50         struct mbuf     *rce_repbody;
   51 
   52         TAILQ_ENTRY(replay_cache_entry) rce_link;
   53         TAILQ_ENTRY(replay_cache_entry) rce_alllink;
   54 };
   55 TAILQ_HEAD(replay_cache_list, replay_cache_entry);
   56 
   57 static struct replay_cache_entry *
   58                 replay_alloc(struct replay_cache *rc, struct rpc_msg *msg,
   59                     struct sockaddr *addr, int h);
   60 static void     replay_free(struct replay_cache *rc,
   61     struct replay_cache_entry *rce);
   62 static void     replay_prune(struct replay_cache *rc);
   63 
   64 #define REPLAY_HASH_SIZE        256
   65 #define REPLAY_MAX              1024
   66 
   67 struct replay_cache {
   68         struct replay_cache_list        rc_cache[REPLAY_HASH_SIZE];
   69         struct replay_cache_list        rc_all;
   70         struct mtx                      rc_lock;
   71         int                             rc_count;
   72         size_t                          rc_size;
   73         size_t                          rc_maxsize;
   74 };
   75 
   76 struct replay_cache *
   77 replay_newcache(size_t maxsize)
   78 {
   79         struct replay_cache *rc;
   80         int i;
   81 
   82         rc = malloc(sizeof(*rc), M_RPC, M_WAITOK|M_ZERO);
   83         for (i = 0; i < REPLAY_HASH_SIZE; i++)
   84                 TAILQ_INIT(&rc->rc_cache[i]);
   85         TAILQ_INIT(&rc->rc_all);
   86         mtx_init(&rc->rc_lock, "rc_lock", NULL, MTX_DEF);
   87         rc->rc_maxsize = maxsize;
   88 
   89         return (rc);
   90 }
   91 
   92 void
   93 replay_setsize(struct replay_cache *rc, size_t newmaxsize)
   94 {
   95 
   96         mtx_lock(&rc->rc_lock);
   97         rc->rc_maxsize = newmaxsize;
   98         replay_prune(rc);
   99         mtx_unlock(&rc->rc_lock);
  100 }
  101 
  102 void
  103 replay_freecache(struct replay_cache *rc)
  104 {
  105 
  106         mtx_lock(&rc->rc_lock);
  107         while (TAILQ_FIRST(&rc->rc_all))
  108                 replay_free(rc, TAILQ_FIRST(&rc->rc_all));
  109         mtx_destroy(&rc->rc_lock);
  110         free(rc, M_RPC);
  111 }
  112 
  113 static struct replay_cache_entry *
  114 replay_alloc(struct replay_cache *rc,
  115     struct rpc_msg *msg, struct sockaddr *addr, int h)
  116 {
  117         struct replay_cache_entry *rce;
  118 
  119         mtx_assert(&rc->rc_lock, MA_OWNED);
  120 
  121         rc->rc_count++;
  122         rce = malloc(sizeof(*rce), M_RPC, M_NOWAIT|M_ZERO);
  123         if (!rce)
  124                 return (NULL);
  125         rce->rce_hash = h;
  126         rce->rce_msg = *msg;
  127         bcopy(addr, &rce->rce_addr, addr->sa_len);
  128 
  129         TAILQ_INSERT_HEAD(&rc->rc_cache[h], rce, rce_link);
  130         TAILQ_INSERT_HEAD(&rc->rc_all, rce, rce_alllink);
  131 
  132         return (rce);
  133 }
  134 
  135 static void
  136 replay_free(struct replay_cache *rc, struct replay_cache_entry *rce)
  137 {
  138 
  139         mtx_assert(&rc->rc_lock, MA_OWNED);
  140 
  141         rc->rc_count--;
  142         TAILQ_REMOVE(&rc->rc_cache[rce->rce_hash], rce, rce_link);
  143         TAILQ_REMOVE(&rc->rc_all, rce, rce_alllink);
  144         if (rce->rce_repbody) {
  145                 rc->rc_size -= m_length(rce->rce_repbody, NULL);
  146                 m_freem(rce->rce_repbody);
  147         }
  148         free(rce, M_RPC);
  149 }
  150 
  151 static void
  152 replay_prune(struct replay_cache *rc)
  153 {
  154         struct replay_cache_entry *rce;
  155 
  156         mtx_assert(&rc->rc_lock, MA_OWNED);
  157 
  158         if (rc->rc_count < REPLAY_MAX && rc->rc_size <= rc->rc_maxsize)
  159                 return;
  160 
  161         do {
  162                 /*
  163                  * Try to free an entry. Don't free in-progress entries.
  164                  */
  165                 TAILQ_FOREACH_REVERSE(rce, &rc->rc_all, replay_cache_list,
  166                     rce_alllink) {
  167                         if (rce->rce_repmsg.rm_xid)
  168                                 break;
  169                 }
  170                 if (rce)
  171                         replay_free(rc, rce);
  172         } while (rce && (rc->rc_count >= REPLAY_MAX
  173             || rc->rc_size > rc->rc_maxsize));
  174 }
  175 
  176 enum replay_state
  177 replay_find(struct replay_cache *rc, struct rpc_msg *msg,
  178     struct sockaddr *addr, struct rpc_msg *repmsg, struct mbuf **mp)
  179 {
  180         int h = HASHSTEP(HASHINIT, msg->rm_xid) % REPLAY_HASH_SIZE;
  181         struct replay_cache_entry *rce;
  182 
  183         mtx_lock(&rc->rc_lock);
  184         TAILQ_FOREACH(rce, &rc->rc_cache[h], rce_link) {
  185                 if (rce->rce_msg.rm_xid == msg->rm_xid
  186                     && rce->rce_msg.rm_call.cb_prog == msg->rm_call.cb_prog     
  187                     && rce->rce_msg.rm_call.cb_vers == msg->rm_call.cb_vers
  188                     && rce->rce_msg.rm_call.cb_proc == msg->rm_call.cb_proc
  189                     && rce->rce_addr.ss_len == addr->sa_len
  190                     && bcmp(&rce->rce_addr, addr, addr->sa_len) == 0) {
  191                         if (rce->rce_repmsg.rm_xid) {
  192                                 /*
  193                                  * We have a reply for this
  194                                  * message. Copy it and return. Keep
  195                                  * replay_all LRU sorted
  196                                  */
  197                                 TAILQ_REMOVE(&rc->rc_all, rce, rce_alllink);
  198                                 TAILQ_INSERT_HEAD(&rc->rc_all, rce,
  199                                     rce_alllink);
  200                                 *repmsg = rce->rce_repmsg;
  201                                 if (rce->rce_repbody) {
  202                                         *mp = m_copym(rce->rce_repbody,
  203                                             0, M_COPYALL, M_NOWAIT);
  204                                         mtx_unlock(&rc->rc_lock);
  205                                         if (!*mp)
  206                                                 return (RS_ERROR);
  207                                 } else {
  208                                         mtx_unlock(&rc->rc_lock);
  209                                 }
  210                                 return (RS_DONE);
  211                         } else {
  212                                 mtx_unlock(&rc->rc_lock);
  213                                 return (RS_INPROGRESS);
  214                         }
  215                 }
  216         }
  217 
  218         replay_prune(rc);
  219 
  220         rce = replay_alloc(rc, msg, addr, h);
  221 
  222         mtx_unlock(&rc->rc_lock);
  223 
  224         if (!rce)
  225                 return (RS_ERROR);
  226         else
  227                 return (RS_NEW);
  228 }
  229 
  230 void
  231 replay_setreply(struct replay_cache *rc,
  232     struct rpc_msg *repmsg, struct sockaddr *addr, struct mbuf *m)
  233 {
  234         int h = HASHSTEP(HASHINIT, repmsg->rm_xid) % REPLAY_HASH_SIZE;
  235         struct replay_cache_entry *rce;
  236 
  237         /*
  238          * Copy the reply before the lock so we can sleep.
  239          */
  240         if (m)
  241                 m = m_copym(m, 0, M_COPYALL, M_WAITOK);
  242 
  243         mtx_lock(&rc->rc_lock);
  244         TAILQ_FOREACH(rce, &rc->rc_cache[h], rce_link) {
  245                 if (rce->rce_msg.rm_xid == repmsg->rm_xid
  246                     && rce->rce_addr.ss_len == addr->sa_len
  247                     && bcmp(&rce->rce_addr, addr, addr->sa_len) == 0) {
  248                         break;
  249                 }
  250         }
  251         if (rce) {
  252                 rce->rce_repmsg = *repmsg;
  253                 rce->rce_repbody = m;
  254                 if (m)
  255                         rc->rc_size += m_length(m, NULL);
  256         }
  257         mtx_unlock(&rc->rc_lock);
  258 }

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