1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)clnp_timer.c 7.6 (Berkeley) 10/11/92 8 */ 9 10 /*********************************************************** 11 Copyright IBM Corporation 1987 12 13 All Rights Reserved 14 15 Permission to use, copy, modify, and distribute this software and its 16 documentation for any purpose and without fee is hereby granted, 17 provided that the above copyright notice appear in all copies and that 18 both that copyright notice and this permission notice appear in 19 supporting documentation, and that the name of IBM not be 20 used in advertising or publicity pertaining to distribution of the 21 software without specific, written prior permission. 22 23 IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING 24 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL 25 IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR 26 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, 27 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 28 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 29 SOFTWARE. 30 31 ******************************************************************/ 32 33 /* 34 * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison 35 */ 36 /* $Header: clnp_timer.c,v 4.2 88/06/29 14:59:05 hagens Exp $ */ 37 /* $Source: /usr/argo/sys/netiso/RCS/clnp_timer.c,v $ */ 38 39 #include <sys/param.h> 40 #include <sys/mbuf.h> 41 #include <sys/domain.h> 42 #include <sys/protosw.h> 43 #include <sys/socket.h> 44 #include <sys/socketvar.h> 45 #include <sys/errno.h> 46 47 #include <net/if.h> 48 #include <net/route.h> 49 50 #include <netiso/iso.h> 51 #include <netiso/clnp.h> 52 #include <netiso/clnp_stat.h> 53 #include <netiso/argo_debug.h> 54 55 extern struct clnp_fragl *clnp_frags; 56 57 /* 58 * FUNCTION: clnp_freefrags 59 * 60 * PURPOSE: Free the resources associated with a fragment 61 * 62 * RETURNS: pointer to next fragment in list of fragments 63 * 64 * SIDE EFFECTS: 65 * 66 * NOTES: 67 * TODO: send ER back to source 68 */ 69 struct clnp_fragl * 70 clnp_freefrags(cfh) 71 register struct clnp_fragl *cfh; /* fragment header to delete */ 72 { 73 struct clnp_fragl *next = cfh->cfl_next; 74 struct clnp_frag *cf; 75 76 /* free any frags hanging around */ 77 cf = cfh->cfl_frags; 78 while (cf != NULL) { 79 struct clnp_frag *cf_next = cf->cfr_next; 80 INCSTAT(cns_fragdropped); 81 m_freem(cf->cfr_data); 82 cf = cf_next; 83 } 84 85 /* free the copy of the header */ 86 INCSTAT(cns_fragdropped); 87 m_freem(cfh->cfl_orighdr); 88 89 if (clnp_frags == cfh) { 90 clnp_frags = cfh->cfl_next; 91 } else { 92 struct clnp_fragl *scan; 93 94 for (scan = clnp_frags; scan != NULL; scan = scan->cfl_next) { 95 if (scan->cfl_next == cfh) { 96 scan->cfl_next = cfh->cfl_next; 97 break; 98 } 99 } 100 } 101 102 /* free the fragment header */ 103 m_freem(dtom(cfh)); 104 105 return(next); 106 } 107 108 /* 109 * FUNCTION: clnp_slowtimo 110 * 111 * PURPOSE: clnp timer processing; if the ttl expires on a 112 * packet on the reassembly queue, discard it. 113 * 114 * RETURNS: none 115 * 116 * SIDE EFFECTS: 117 * 118 * NOTES: 119 */ 120 clnp_slowtimo() 121 { 122 register struct clnp_fragl *cfh = clnp_frags; 123 int s = splnet(); 124 125 while (cfh != NULL) { 126 if (--cfh->cfl_ttl == 0) { 127 cfh = clnp_freefrags(cfh); 128 INCSTAT(cns_fragtimeout); 129 } else { 130 cfh = cfh->cfl_next; 131 } 132 } 133 splx(s); 134 } 135 136 /* 137 * FUNCTION: clnp_drain 138 * 139 * PURPOSE: drain off all datagram fragments 140 * 141 * RETURNS: none 142 * 143 * SIDE EFFECTS: 144 * 145 * NOTES: 146 * TODO: should send back ER 147 */ 148 clnp_drain() 149 { 150 register struct clnp_fragl *cfh = clnp_frags; 151 152 while (cfh != NULL) 153 cfh = clnp_freefrags(cfh); 154 } 155