sys/netiso/clnp_timer.c

   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 }