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 
33 static void ax25_heartbeat_expiry(struct timer_list *);
34 static void ax25_t1timer_expiry(struct timer_list *);
35 static void ax25_t2timer_expiry(struct timer_list *);
36 static void ax25_t3timer_expiry(struct timer_list *);
37 static void ax25_idletimer_expiry(struct timer_list *);
38 
ax25_setup_timers(ax25_cb * ax25)39 void 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 
ax25_start_heartbeat(ax25_cb * ax25)48 void ax25_start_heartbeat(ax25_cb *ax25)
49 {
50 	mod_timer(&ax25->timer, jiffies + 5 * HZ);
51 }
52 
ax25_start_t1timer(ax25_cb * ax25)53 void ax25_start_t1timer(ax25_cb *ax25)
54 {
55 	mod_timer(&ax25->t1timer, jiffies + ax25->t1);
56 }
57 
ax25_start_t2timer(ax25_cb * ax25)58 void ax25_start_t2timer(ax25_cb *ax25)
59 {
60 	mod_timer(&ax25->t2timer, jiffies + ax25->t2);
61 }
62 
ax25_start_t3timer(ax25_cb * ax25)63 void 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 
ax25_start_idletimer(ax25_cb * ax25)71 void 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 
ax25_stop_heartbeat(ax25_cb * ax25)79 void ax25_stop_heartbeat(ax25_cb *ax25)
80 {
81 	del_timer(&ax25->timer);
82 }
83 
ax25_stop_t1timer(ax25_cb * ax25)84 void ax25_stop_t1timer(ax25_cb *ax25)
85 {
86 	del_timer(&ax25->t1timer);
87 }
88 
ax25_stop_t2timer(ax25_cb * ax25)89 void ax25_stop_t2timer(ax25_cb *ax25)
90 {
91 	del_timer(&ax25->t2timer);
92 }
93 
ax25_stop_t3timer(ax25_cb * ax25)94 void ax25_stop_t3timer(ax25_cb *ax25)
95 {
96 	del_timer(&ax25->t3timer);
97 }
98 
ax25_stop_idletimer(ax25_cb * ax25)99 void ax25_stop_idletimer(ax25_cb *ax25)
100 {
101 	del_timer(&ax25->idletimer);
102 }
103 
ax25_t1timer_running(ax25_cb * ax25)104 int ax25_t1timer_running(ax25_cb *ax25)
105 {
106 	return timer_pending(&ax25->t1timer);
107 }
108 
ax25_display_timer(struct timer_list * timer)109 unsigned long ax25_display_timer(struct timer_list *timer)
110 {
111 	if (!timer_pending(timer))
112 		return 0;
113 
114 	return timer->expires - jiffies;
115 }
116 
117 EXPORT_SYMBOL(ax25_display_timer);
118 
ax25_heartbeat_expiry(struct timer_list * t)119 static void ax25_heartbeat_expiry(struct timer_list *t)
120 {
121 	int proto = AX25_PROTO_STD_SIMPLEX;
122 	ax25_cb *ax25 = from_timer(ax25, t, timer);
123 
124 	if (ax25->ax25_dev)
125 		proto = ax25->ax25_dev->values[AX25_VALUES_PROTOCOL];
126 
127 	switch (proto) {
128 	case AX25_PROTO_STD_SIMPLEX:
129 	case AX25_PROTO_STD_DUPLEX:
130 		ax25_std_heartbeat_expiry(ax25);
131 		break;
132 
133 #ifdef CONFIG_AX25_DAMA_SLAVE
134 	case AX25_PROTO_DAMA_SLAVE:
135 		if (ax25->ax25_dev->dama.slave)
136 			ax25_ds_heartbeat_expiry(ax25);
137 		else
138 			ax25_std_heartbeat_expiry(ax25);
139 		break;
140 #endif
141 	}
142 }
143 
ax25_t1timer_expiry(struct timer_list * t)144 static void ax25_t1timer_expiry(struct timer_list *t)
145 {
146 	ax25_cb *ax25 = from_timer(ax25, t, t1timer);
147 
148 	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
149 	case AX25_PROTO_STD_SIMPLEX:
150 	case AX25_PROTO_STD_DUPLEX:
151 		ax25_std_t1timer_expiry(ax25);
152 		break;
153 
154 #ifdef CONFIG_AX25_DAMA_SLAVE
155 	case AX25_PROTO_DAMA_SLAVE:
156 		if (!ax25->ax25_dev->dama.slave)
157 			ax25_std_t1timer_expiry(ax25);
158 		break;
159 #endif
160 	}
161 }
162 
ax25_t2timer_expiry(struct timer_list * t)163 static void ax25_t2timer_expiry(struct timer_list *t)
164 {
165 	ax25_cb *ax25 = from_timer(ax25, t, t2timer);
166 
167 	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
168 	case AX25_PROTO_STD_SIMPLEX:
169 	case AX25_PROTO_STD_DUPLEX:
170 		ax25_std_t2timer_expiry(ax25);
171 		break;
172 
173 #ifdef CONFIG_AX25_DAMA_SLAVE
174 	case AX25_PROTO_DAMA_SLAVE:
175 		if (!ax25->ax25_dev->dama.slave)
176 			ax25_std_t2timer_expiry(ax25);
177 		break;
178 #endif
179 	}
180 }
181 
ax25_t3timer_expiry(struct timer_list * t)182 static void ax25_t3timer_expiry(struct timer_list *t)
183 {
184 	ax25_cb *ax25 = from_timer(ax25, t, t3timer);
185 
186 	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
187 	case AX25_PROTO_STD_SIMPLEX:
188 	case AX25_PROTO_STD_DUPLEX:
189 		ax25_std_t3timer_expiry(ax25);
190 		break;
191 
192 #ifdef CONFIG_AX25_DAMA_SLAVE
193 	case AX25_PROTO_DAMA_SLAVE:
194 		if (ax25->ax25_dev->dama.slave)
195 			ax25_ds_t3timer_expiry(ax25);
196 		else
197 			ax25_std_t3timer_expiry(ax25);
198 		break;
199 #endif
200 	}
201 }
202 
ax25_idletimer_expiry(struct timer_list * t)203 static void ax25_idletimer_expiry(struct timer_list *t)
204 {
205 	ax25_cb *ax25 = from_timer(ax25, t, idletimer);
206 
207 	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
208 	case AX25_PROTO_STD_SIMPLEX:
209 	case AX25_PROTO_STD_DUPLEX:
210 		ax25_std_idletimer_expiry(ax25);
211 		break;
212 
213 #ifdef CONFIG_AX25_DAMA_SLAVE
214 	case AX25_PROTO_DAMA_SLAVE:
215 		if (ax25->ax25_dev->dama.slave)
216 			ax25_ds_idletimer_expiry(ax25);
217 		else
218 			ax25_std_idletimer_expiry(ax25);
219 		break;
220 #endif
221 	}
222 }
223