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 39Permission to use, copy, modify, and distribute this software and its 40documentation for any purpose and without fee is hereby granted, 41provided that the above copyright notice appear in all copies and that 42both that copyright notice and this permission notice appear in 43supporting documentation, and that the name of IBM not be 44used in advertising or publicity pertaining to distribution of the 45software without specific, written prior permission. 46 47IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING 48ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL 49IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR 50ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, 51WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 52ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 53SOFTWARE. 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 80extern 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 */ 94struct clnp_fragl * 95clnp_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 */ 145void 146clnp_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 */ 177void 178clnp_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} 188