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