1 /*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 *
7 * @(#)clnp_timer.c 8.1 (Berkeley) 06/10/93
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 *
clnp_freefrags(cfh)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 */
clnp_slowtimo()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 */
clnp_drain()148 clnp_drain()
149 {
150 register struct clnp_fragl *cfh = clnp_frags;
151
152 while (cfh != NULL)
153 cfh = clnp_freefrags(cfh);
154 }
155