1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
5 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
6 * Copyright (C) Tomi Manninen OH2BNS (oh2bns@sral.fi)
7 * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk)
8 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
9 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
10 * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
11 */
12#include <linux/errno.h>
13#include <linux/types.h>
14#include <linux/socket.h>
15#include <linux/in.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/jiffies.h>
19#include <linux/timer.h>
20#include <linux/string.h>
21#include <linux/sockios.h>
22#include <linux/net.h>
23#include <net/ax25.h>
24#include <linux/inet.h>
25#include <linux/netdevice.h>
26#include <linux/skbuff.h>
27#include <net/sock.h>
28#include <linux/uaccess.h>
29#include <linux/fcntl.h>
30#include <linux/mm.h>
31#include <linux/interrupt.h>
32
33static void ax25_heartbeat_expiry(struct timer_list *);
34static void ax25_t1timer_expiry(struct timer_list *);
35static void ax25_t2timer_expiry(struct timer_list *);
36static void ax25_t3timer_expiry(struct timer_list *);
37static void ax25_idletimer_expiry(struct timer_list *);
38
39void ax25_setup_timers(ax25_cb *ax25)
40{
41	timer_setup(&ax25->timer, ax25_heartbeat_expiry, 0);
42	timer_setup(&ax25->t1timer, ax25_t1timer_expiry, 0);
43	timer_setup(&ax25->t2timer, ax25_t2timer_expiry, 0);
44	timer_setup(&ax25->t3timer, ax25_t3timer_expiry, 0);
45	timer_setup(&ax25->idletimer, ax25_idletimer_expiry, 0);
46}
47
48void ax25_start_heartbeat(ax25_cb *ax25)
49{
50	mod_timer(&ax25->timer, jiffies + 5 * HZ);
51}
52
53void ax25_start_t1timer(ax25_cb *ax25)
54{
55	mod_timer(&ax25->t1timer, jiffies + ax25->t1);
56}
57
58void ax25_start_t2timer(ax25_cb *ax25)
59{
60	mod_timer(&ax25->t2timer, jiffies + ax25->t2);
61}
62
63void ax25_start_t3timer(ax25_cb *ax25)
64{
65	if (ax25->t3 > 0)
66		mod_timer(&ax25->t3timer, jiffies + ax25->t3);
67	else
68		del_timer(&ax25->t3timer);
69}
70
71void ax25_start_idletimer(ax25_cb *ax25)
72{
73	if (ax25->idle > 0)
74		mod_timer(&ax25->idletimer, jiffies + ax25->idle);
75	else
76		del_timer(&ax25->idletimer);
77}
78
79void ax25_stop_heartbeat(ax25_cb *ax25)
80{
81	del_timer(&ax25->timer);
82}
83
84void ax25_stop_t1timer(ax25_cb *ax25)
85{
86	del_timer(&ax25->t1timer);
87}
88
89void ax25_stop_t2timer(ax25_cb *ax25)
90{
91	del_timer(&ax25->t2timer);
92}
93
94void ax25_stop_t3timer(ax25_cb *ax25)
95{
96	del_timer(&ax25->t3timer);
97}
98
99void ax25_stop_idletimer(ax25_cb *ax25)
100{
101	del_timer(&ax25->idletimer);
102}
103
104int ax25_t1timer_running(ax25_cb *ax25)
105{
106	return timer_pending(&ax25->t1timer);
107}
108
109unsigned long ax25_display_timer(struct timer_list *timer)
110{
111	long delta = timer->expires - jiffies;
112
113	if (!timer_pending(timer))
114		return 0;
115
116	return max(0L, delta);
117}
118
119EXPORT_SYMBOL(ax25_display_timer);
120
121static void ax25_heartbeat_expiry(struct timer_list *t)
122{
123	int proto = AX25_PROTO_STD_SIMPLEX;
124	ax25_cb *ax25 = from_timer(ax25, t, timer);
125
126	if (ax25->ax25_dev)
127		proto = ax25->ax25_dev->values[AX25_VALUES_PROTOCOL];
128
129	switch (proto) {
130	case AX25_PROTO_STD_SIMPLEX:
131	case AX25_PROTO_STD_DUPLEX:
132		ax25_std_heartbeat_expiry(ax25);
133		break;
134
135#ifdef CONFIG_AX25_DAMA_SLAVE
136	case AX25_PROTO_DAMA_SLAVE:
137		if (ax25->ax25_dev->dama.slave)
138			ax25_ds_heartbeat_expiry(ax25);
139		else
140			ax25_std_heartbeat_expiry(ax25);
141		break;
142#endif
143	}
144}
145
146static void ax25_t1timer_expiry(struct timer_list *t)
147{
148	ax25_cb *ax25 = from_timer(ax25, t, t1timer);
149
150	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
151	case AX25_PROTO_STD_SIMPLEX:
152	case AX25_PROTO_STD_DUPLEX:
153		ax25_std_t1timer_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_std_t1timer_expiry(ax25);
160		break;
161#endif
162	}
163}
164
165static void ax25_t2timer_expiry(struct timer_list *t)
166{
167	ax25_cb *ax25 = from_timer(ax25, t, t2timer);
168
169	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
170	case AX25_PROTO_STD_SIMPLEX:
171	case AX25_PROTO_STD_DUPLEX:
172		ax25_std_t2timer_expiry(ax25);
173		break;
174
175#ifdef CONFIG_AX25_DAMA_SLAVE
176	case AX25_PROTO_DAMA_SLAVE:
177		if (!ax25->ax25_dev->dama.slave)
178			ax25_std_t2timer_expiry(ax25);
179		break;
180#endif
181	}
182}
183
184static void ax25_t3timer_expiry(struct timer_list *t)
185{
186	ax25_cb *ax25 = from_timer(ax25, t, t3timer);
187
188	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
189	case AX25_PROTO_STD_SIMPLEX:
190	case AX25_PROTO_STD_DUPLEX:
191		ax25_std_t3timer_expiry(ax25);
192		break;
193
194#ifdef CONFIG_AX25_DAMA_SLAVE
195	case AX25_PROTO_DAMA_SLAVE:
196		if (ax25->ax25_dev->dama.slave)
197			ax25_ds_t3timer_expiry(ax25);
198		else
199			ax25_std_t3timer_expiry(ax25);
200		break;
201#endif
202	}
203}
204
205static void ax25_idletimer_expiry(struct timer_list *t)
206{
207	ax25_cb *ax25 = from_timer(ax25, t, idletimer);
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_idletimer_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_idletimer_expiry(ax25);
219		else
220			ax25_std_idletimer_expiry(ax25);
221		break;
222#endif
223	}
224}
225