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/netiso/clnp_timer.c

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    1 /*      $NetBSD: clnp_timer.c,v 1.15 2008/05/21 17:08:07 drochner Exp $ */
    2 
    3 /*-
    4  * Copyright (c) 1991, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)clnp_timer.c        8.1 (Berkeley) 6/10/93
   32  */
   33 
   34 /***********************************************************
   35                 Copyright IBM Corporation 1987
   36 
   37                       All Rights Reserved
   38 
   39 Permission to use, copy, modify, and distribute this software and its
   40 documentation for any purpose and without fee is hereby granted,
   41 provided that the above copyright notice appear in all copies and that
   42 both that copyright notice and this permission notice appear in
   43 supporting documentation, and that the name of IBM not be
   44 used in advertising or publicity pertaining to distribution of the
   45 software without specific, written prior permission.
   46 
   47 IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
   48 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
   49 IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
   50 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
   51 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
   52 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
   53 SOFTWARE.
   54 
   55 ******************************************************************/
   56 
   57 /*
   58  * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
   59  */
   60 
   61 #include <sys/cdefs.h>
   62 __KERNEL_RCSID(0, "$NetBSD: clnp_timer.c,v 1.15 2008/05/21 17:08:07 drochner Exp $");
   63 
   64 #include <sys/param.h>
   65 #include <sys/mbuf.h>
   66 #include <sys/domain.h>
   67 #include <sys/protosw.h>
   68 #include <sys/socket.h>
   69 #include <sys/socketvar.h>
   70 #include <sys/errno.h>
   71 
   72 #include <net/if.h>
   73 #include <net/route.h>
   74 
   75 #include <netiso/iso.h>
   76 #include <netiso/clnp.h>
   77 #include <netiso/clnp_stat.h>
   78 #include <netiso/argo_debug.h>
   79 
   80 extern struct clnp_fragl *clnp_frags;
   81 
   82 /*
   83  * FUNCTION:            clnp_freefrags
   84  *
   85  * PURPOSE:                     Free the resources associated with a fragment
   86  *
   87  * RETURNS:                     pointer to next fragment in list of fragments
   88  *
   89  * SIDE EFFECTS:
   90  *
   91  * NOTES:
   92  *                      TODO: send ER back to source
   93  */
   94 struct clnp_fragl *
   95 clnp_freefrags(
   96         struct clnp_fragl *cfh) /* fragment header to delete */
   97 {
   98         struct clnp_fragl *next = cfh->cfl_next;
   99         struct clnp_frag *cf;
  100 
  101         /* free any frags hanging around */
  102         cf = cfh->cfl_frags;
  103         while (cf != NULL) {
  104                 struct clnp_frag *cf_next = cf->cfr_next;
  105                 INCSTAT(cns_fragdropped);
  106                 m_freem(cf->cfr_data);
  107                 cf = cf_next;
  108         }
  109 
  110         /* free the copy of the header */
  111         INCSTAT(cns_fragdropped);
  112         m_freem(cfh->cfl_orighdr);
  113 
  114         if (clnp_frags == cfh) {
  115                 clnp_frags = cfh->cfl_next;
  116         } else {
  117                 struct clnp_fragl *scan;
  118 
  119                 for (scan = clnp_frags; scan != NULL; scan = scan->cfl_next) {
  120                         if (scan->cfl_next == cfh) {
  121                                 scan->cfl_next = cfh->cfl_next;
  122                                 break;
  123                         }
  124                 }
  125         }
  126 
  127         /* free the fragment header */
  128         FREE(cfh, M_FTABLE);
  129 
  130         return (next);
  131 }
  132 
  133 /*
  134  * FUNCTION:            clnp_slowtimo
  135  *
  136  * PURPOSE:                     clnp timer processing; if the ttl expires on a
  137  *                                      packet on the reassembly queue, discard it.
  138  *
  139  * RETURNS:                     none
  140  *
  141  * SIDE EFFECTS:
  142  *
  143  * NOTES:
  144  */
  145 void
  146 clnp_slowtimo(void)
  147 {
  148         struct clnp_fragl *cfh;
  149 
  150         mutex_enter(softnet_lock);
  151         KERNEL_LOCK(1, NULL);
  152         cfh = clnp_frags;
  153         while (cfh != NULL) {
  154                 if (--cfh->cfl_ttl == 0) {
  155                         cfh = clnp_freefrags(cfh);
  156                         INCSTAT(cns_fragtimeout);
  157                 } else {
  158                         cfh = cfh->cfl_next;
  159                 }
  160         }
  161         KERNEL_UNLOCK_ONE(NULL);
  162         mutex_exit(softnet_lock);
  163 }
  164 
  165 /*
  166  * FUNCTION:            clnp_drain
  167  *
  168  * PURPOSE:                     drain off all datagram fragments
  169  *
  170  * RETURNS:                     none
  171  *
  172  * SIDE EFFECTS:
  173  *
  174  * NOTES:
  175  *      TODO: should send back ER
  176  */
  177 void
  178 clnp_drain(void)
  179 {
  180         struct clnp_fragl *cfh;
  181 
  182         KERNEL_LOCK(1, NULL);
  183         cfh = clnp_frags;
  184         while (cfh != NULL)
  185                 cfh = clnp_freefrags(cfh);
  186         KERNEL_UNLOCK_ONE(NULL);
  187 }

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