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 long delta = timer->expires - jiffies;
112
113 if (!timer_pending(timer))
114 return 0;
115
116 return max(0L, delta);
117 }
118
119 EXPORT_SYMBOL(ax25_display_timer);
120
ax25_heartbeat_expiry(struct timer_list * t)121 static 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
ax25_t1timer_expiry(struct timer_list * t)146 static 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
ax25_t2timer_expiry(struct timer_list * t)165 static 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
ax25_t3timer_expiry(struct timer_list * t)184 static 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
ax25_idletimer_expiry(struct timer_list * t)205 static 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