1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
8 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
9 * Copyright (C) Tomi Manninen OH2BNS (oh2bns@sral.fi)
10 * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk)
11 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
12 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
13 * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
14 */
15#include <linux/errno.h>
16#include <linux/types.h>
17#include <linux/socket.h>
18#include <linux/in.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/jiffies.h>
22#include <linux/timer.h>
23#include <linux/string.h>
24#include <linux/sockios.h>
25#include <linux/net.h>
26#include <net/ax25.h>
27#include <linux/inet.h>
28#include <linux/netdevice.h>
29#include <linux/skbuff.h>
30#include <net/sock.h>
31#include <asm/uaccess.h>
32#include <asm/system.h>
33#include <linux/fcntl.h>
34#include <linux/mm.h>
35#include <linux/interrupt.h>
36
37static void ax25_heartbeat_expiry(unsigned long);
38static void ax25_t1timer_expiry(unsigned long);
39static void ax25_t2timer_expiry(unsigned long);
40static void ax25_t3timer_expiry(unsigned long);
41static void ax25_idletimer_expiry(unsigned long);
42
43void ax25_start_heartbeat(ax25_cb *ax25)
44{
45	del_timer(&ax25->timer);
46
47	ax25->timer.data     = (unsigned long)ax25;
48	ax25->timer.function = &ax25_heartbeat_expiry;
49	ax25->timer.expires  = jiffies + 5 * HZ;
50
51	add_timer(&ax25->timer);
52}
53
54void ax25_start_t1timer(ax25_cb *ax25)
55{
56	del_timer(&ax25->t1timer);
57
58	ax25->t1timer.data     = (unsigned long)ax25;
59	ax25->t1timer.function = &ax25_t1timer_expiry;
60	ax25->t1timer.expires  = jiffies + ax25->t1;
61
62	add_timer(&ax25->t1timer);
63}
64
65void ax25_start_t2timer(ax25_cb *ax25)
66{
67	del_timer(&ax25->t2timer);
68
69	ax25->t2timer.data     = (unsigned long)ax25;
70	ax25->t2timer.function = &ax25_t2timer_expiry;
71	ax25->t2timer.expires  = jiffies + ax25->t2;
72
73	add_timer(&ax25->t2timer);
74}
75
76void ax25_start_t3timer(ax25_cb *ax25)
77{
78	del_timer(&ax25->t3timer);
79
80	if (ax25->t3 > 0) {
81		ax25->t3timer.data     = (unsigned long)ax25;
82		ax25->t3timer.function = &ax25_t3timer_expiry;
83		ax25->t3timer.expires  = jiffies + ax25->t3;
84
85		add_timer(&ax25->t3timer);
86	}
87}
88
89void ax25_start_idletimer(ax25_cb *ax25)
90{
91	del_timer(&ax25->idletimer);
92
93	if (ax25->idle > 0) {
94		ax25->idletimer.data     = (unsigned long)ax25;
95		ax25->idletimer.function = &ax25_idletimer_expiry;
96		ax25->idletimer.expires  = jiffies + ax25->idle;
97
98		add_timer(&ax25->idletimer);
99	}
100}
101
102void ax25_stop_heartbeat(ax25_cb *ax25)
103{
104	del_timer(&ax25->timer);
105}
106
107void ax25_stop_t1timer(ax25_cb *ax25)
108{
109	del_timer(&ax25->t1timer);
110}
111
112void ax25_stop_t2timer(ax25_cb *ax25)
113{
114	del_timer(&ax25->t2timer);
115}
116
117void ax25_stop_t3timer(ax25_cb *ax25)
118{
119	del_timer(&ax25->t3timer);
120}
121
122void ax25_stop_idletimer(ax25_cb *ax25)
123{
124	del_timer(&ax25->idletimer);
125}
126
127int ax25_t1timer_running(ax25_cb *ax25)
128{
129	return timer_pending(&ax25->t1timer);
130}
131
132unsigned long ax25_display_timer(struct timer_list *timer)
133{
134	if (!timer_pending(timer))
135		return 0;
136
137	return timer->expires - jiffies;
138}
139
140EXPORT_SYMBOL(ax25_display_timer);
141
142static void ax25_heartbeat_expiry(unsigned long param)
143{
144	int proto = AX25_PROTO_STD_SIMPLEX;
145	ax25_cb *ax25 = (ax25_cb *)param;
146
147	if (ax25->ax25_dev)
148		proto = ax25->ax25_dev->values[AX25_VALUES_PROTOCOL];
149
150	switch (proto) {
151	case AX25_PROTO_STD_SIMPLEX:
152	case AX25_PROTO_STD_DUPLEX:
153		ax25_std_heartbeat_expiry(ax25);
154		break;
155
156#ifdef CONFIG_AX25_DAMA_SLAVE
157	case AX25_PROTO_DAMA_SLAVE:
158		if (ax25->ax25_dev->dama.slave)
159			ax25_ds_heartbeat_expiry(ax25);
160		else
161			ax25_std_heartbeat_expiry(ax25);
162		break;
163#endif
164	}
165}
166
167static void ax25_t1timer_expiry(unsigned long param)
168{
169	ax25_cb *ax25 = (ax25_cb *)param;
170
171	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
172	case AX25_PROTO_STD_SIMPLEX:
173	case AX25_PROTO_STD_DUPLEX:
174		ax25_std_t1timer_expiry(ax25);
175		break;
176
177#ifdef CONFIG_AX25_DAMA_SLAVE
178	case AX25_PROTO_DAMA_SLAVE:
179		if (!ax25->ax25_dev->dama.slave)
180			ax25_std_t1timer_expiry(ax25);
181		break;
182#endif
183	}
184}
185
186static void ax25_t2timer_expiry(unsigned long param)
187{
188	ax25_cb *ax25 = (ax25_cb *)param;
189
190	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
191	case AX25_PROTO_STD_SIMPLEX:
192	case AX25_PROTO_STD_DUPLEX:
193		ax25_std_t2timer_expiry(ax25);
194		break;
195
196#ifdef CONFIG_AX25_DAMA_SLAVE
197	case AX25_PROTO_DAMA_SLAVE:
198		if (!ax25->ax25_dev->dama.slave)
199			ax25_std_t2timer_expiry(ax25);
200		break;
201#endif
202	}
203}
204
205static void ax25_t3timer_expiry(unsigned long param)
206{
207	ax25_cb *ax25 = (ax25_cb *)param;
208
209	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
210	case AX25_PROTO_STD_SIMPLEX:
211	case AX25_PROTO_STD_DUPLEX:
212		ax25_std_t3timer_expiry(ax25);
213		break;
214
215#ifdef CONFIG_AX25_DAMA_SLAVE
216	case AX25_PROTO_DAMA_SLAVE:
217		if (ax25->ax25_dev->dama.slave)
218			ax25_ds_t3timer_expiry(ax25);
219		else
220			ax25_std_t3timer_expiry(ax25);
221		break;
222#endif
223	}
224}
225
226static void ax25_idletimer_expiry(unsigned long param)
227{
228	ax25_cb *ax25 = (ax25_cb *)param;
229
230	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
231	case AX25_PROTO_STD_SIMPLEX:
232	case AX25_PROTO_STD_DUPLEX:
233		ax25_std_idletimer_expiry(ax25);
234		break;
235
236#ifdef CONFIG_AX25_DAMA_SLAVE
237	case AX25_PROTO_DAMA_SLAVE:
238		if (ax25->ax25_dev->dama.slave)
239			ax25_ds_idletimer_expiry(ax25);
240		else
241			ax25_std_idletimer_expiry(ax25);
242		break;
243#endif
244	}
245}
246