1 /*********************************************************** 2 Copyright IBM Corporation 1987 3 4 All Rights Reserved 5 6 Permission to use, copy, modify, and distribute this software and its 7 documentation for any purpose and without fee is hereby granted, 8 provided that the above copyright notice appear in all copies and that 9 both that copyright notice and this permission notice appear in 10 supporting documentation, and that the name of IBM not be 11 used in advertising or publicity pertaining to distribution of the 12 software without specific, written prior permission. 13 14 IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING 15 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL 16 IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR 17 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, 18 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 19 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 20 SOFTWARE. 21 22 ******************************************************************/ 23 24 /* 25 * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison 26 */ 27 /* $Header: clnp_timer.c,v 4.2 88/06/29 14:59:05 hagens Exp $ */ 28 /* $Source: /usr/argo/sys/netiso/RCS/clnp_timer.c,v $ */ 29 /* @(#)clnp_timer.c 7.4 (Berkeley) 09/22/89 */ 30 31 #ifndef lint 32 static char *rcsid = "$Header: clnp_timer.c,v 4.2 88/06/29 14:59:05 hagens Exp $"; 33 #endif lint 34 35 #include "param.h" 36 #include "mbuf.h" 37 #include "domain.h" 38 #include "protosw.h" 39 #include "socket.h" 40 #include "socketvar.h" 41 #include "errno.h" 42 43 #include "../net/if.h" 44 #include "../net/route.h" 45 46 #include "iso.h" 47 #include "clnp.h" 48 #include "clnp_stat.h" 49 #include "argo_debug.h" 50 51 extern struct clnp_fragl *clnp_frags; 52 53 /* 54 * FUNCTION: clnp_freefrags 55 * 56 * PURPOSE: Free the resources associated with a fragment 57 * 58 * RETURNS: pointer to next fragment in list of fragments 59 * 60 * SIDE EFFECTS: 61 * 62 * NOTES: 63 * TODO: send ER back to source 64 */ 65 struct clnp_fragl * 66 clnp_freefrags(cfh) 67 register struct clnp_fragl *cfh; /* fragment header to delete */ 68 { 69 struct clnp_fragl *next = cfh->cfl_next; 70 struct clnp_frag *cf; 71 72 /* free any frags hanging around */ 73 cf = cfh->cfl_frags; 74 while (cf != NULL) { 75 struct clnp_frag *cf_next = cf->cfr_next; 76 INCSTAT(cns_fragdropped); 77 m_freem(cf->cfr_data); 78 cf = cf_next; 79 } 80 81 /* free the copy of the header */ 82 INCSTAT(cns_fragdropped); 83 m_freem(cfh->cfl_orighdr); 84 85 if (clnp_frags == cfh) { 86 clnp_frags = cfh->cfl_next; 87 } else { 88 struct clnp_fragl *scan; 89 90 for (scan = clnp_frags; scan != NULL; scan = scan->cfl_next) { 91 if (scan->cfl_next == cfh) { 92 scan->cfl_next = cfh->cfl_next; 93 break; 94 } 95 } 96 } 97 98 /* free the fragment header */ 99 m_freem(dtom(cfh)); 100 101 return(next); 102 } 103 104 /* 105 * FUNCTION: clnp_slowtimo 106 * 107 * PURPOSE: clnp timer processing; if the ttl expires on a 108 * packet on the reassembly queue, discard it. 109 * 110 * RETURNS: none 111 * 112 * SIDE EFFECTS: 113 * 114 * NOTES: 115 */ 116 clnp_slowtimo() 117 { 118 register struct clnp_fragl *cfh = clnp_frags; 119 int s = splnet(); 120 121 while (cfh != NULL) { 122 if (--cfh->cfl_ttl == 0) { 123 cfh = clnp_freefrags(cfh); 124 INCSTAT(cns_fragtimeout); 125 } else { 126 cfh = cfh->cfl_next; 127 } 128 } 129 splx(s); 130 } 131 132 /* 133 * FUNCTION: clnp_drain 134 * 135 * PURPOSE: drain off all datagram fragments 136 * 137 * RETURNS: none 138 * 139 * SIDE EFFECTS: 140 * 141 * NOTES: 142 * TODO: should send back ER 143 */ 144 clnp_drain() 145 { 146 register struct clnp_fragl *cfh = clnp_frags; 147 148 while (cfh != NULL) 149 cfh = clnp_freefrags(cfh); 150 } 151