bsd/netiso/clnp_timer.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*-
  23  * Copyright (c) 1991, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  *
  54  *      @(#)clnp_timer.c        8.1 (Berkeley) 6/10/93
  55  */
  56
  57 /***********************************************************
  58                 Copyright IBM Corporation 1987
  59
  60                       All Rights Reserved
  61
  62 Permission to use, copy, modify, and distribute this software and its
  63 documentation for any purpose and without fee is hereby granted,
  64 provided that the above copyright notice appear in all copies and that
  65 both that copyright notice and this permission notice appear in
  66 supporting documentation, and that the name of IBM not be
  67 used in advertising or publicity pertaining to distribution of the
  68 software without specific, written prior permission.
  69
  70 IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
  71 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
  72 IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
  73 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  74 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  75 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  76 SOFTWARE.
  77
  78 ******************************************************************/
  79
  80 /*
  81  * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
  82  */
  83
  84 #include <sys/param.h>
  85 #include <sys/mbuf.h>
  86 #include <sys/domain.h>
  87 #include <sys/protosw.h>
  88 #include <sys/socket.h>
  89 #include <sys/socketvar.h>
  90 #include <sys/errno.h>
  91
  92 #include <net/if.h>
  93 #include <net/route.h>
  94
  95 #include <netiso/iso.h>
  96 #include <netiso/clnp.h>
  97 #include <netiso/clnp_stat.h>
  98 #include <netiso/argo_debug.h>
  99
 100 extern struct clnp_fragl *clnp_frags;
 101
 102 /*
 103  * FUNCTION:            clnp_freefrags
 104  *
 105  * PURPOSE:                     Free the resources associated with a fragment
 106  *
 107  * RETURNS:                     pointer to next fragment in list of fragments
 108  *
 109  * SIDE EFFECTS:
 110  *
 111  * NOTES:
 112  *                      TODO: send ER back to source
 113  */
 114 struct clnp_fragl *
 115 clnp_freefrags(cfh)
 116 register struct clnp_fragl      *cfh;   /* fragment header to delete */
 117 {
 118         struct clnp_fragl       *next = cfh->cfl_next;
 119         struct clnp_frag        *cf;
 120
 121         /* free any frags hanging around */
 122         cf = cfh->cfl_frags;
 123         while (cf != NULL) {
 124                 struct clnp_frag        *cf_next = cf->cfr_next;
 125                 INCSTAT(cns_fragdropped);
 126                 m_freem(cf->cfr_data);
 127                 cf = cf_next;
 128         }
 129
 130         /* free the copy of the header */
 131         INCSTAT(cns_fragdropped);
 132         m_freem(cfh->cfl_orighdr);
 133
 134         if (clnp_frags == cfh) {
 135                 clnp_frags = cfh->cfl_next;
 136         } else {
 137                 struct clnp_fragl       *scan;
 138
 139                 for (scan = clnp_frags; scan != NULL; scan = scan->cfl_next) {
 140                         if (scan->cfl_next == cfh) {
 141                                 scan->cfl_next = cfh->cfl_next;
 142                                 break;
 143                         }
 144                 }
 145         }
 146
 147         /* free the fragment header */
 148         m_freem(dtom(cfh));
 149
 150         return(next);
 151 }
 152
 153 /*
 154  * FUNCTION:            clnp_slowtimo
 155  *
 156  * PURPOSE:                     clnp timer processing; if the ttl expires on a
 157  *                                      packet on the reassembly queue, discard it.
 158  *
 159  * RETURNS:                     none
 160  *
 161  * SIDE EFFECTS:
 162  *
 163  * NOTES:
 164  */
 165 clnp_slowtimo()
 166 {
 167         register struct clnp_fragl      *cfh = clnp_frags;
 168         int s = splnet();
 169
 170         while (cfh != NULL) {
 171                 if (--cfh->cfl_ttl == 0) {
 172                         cfh = clnp_freefrags(cfh);
 173                         INCSTAT(cns_fragtimeout);
 174                 } else {
 175                         cfh = cfh->cfl_next;
 176                 }
 177         }
 178         splx(s);
 179 }
 180
 181 /*
 182  * FUNCTION:            clnp_drain
 183  *
 184  * PURPOSE:                     drain off all datagram fragments
 185  *
 186  * RETURNS:                     none
 187  *
 188  * SIDE EFFECTS:
 189  *
 190  * NOTES:
 191  *      TODO: should send back ER
 192  */
 193 clnp_drain()
 194 {
 195         register struct clnp_fragl      *cfh = clnp_frags;
 196
 197         while (cfh != NULL)
 198                 cfh = clnp_freefrags(cfh);
 199 }