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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) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
9 */
10#include <linux/errno.h>
11#include <linux/types.h>
12#include <linux/socket.h>
13#include <linux/in.h>
14#include <linux/kernel.h>
15#include <linux/jiffies.h>
16#include <linux/timer.h>
17#include <linux/string.h>
18#include <linux/sockios.h>
19#include <linux/net.h>
20#include <net/ax25.h>
21#include <linux/inet.h>
22#include <linux/netdevice.h>
23#include <linux/skbuff.h>
24#include <net/sock.h>
25#include <net/tcp_states.h>
26#include <linux/uaccess.h>
27#include <linux/fcntl.h>
28#include <linux/mm.h>
29#include <linux/interrupt.h>
30#include <net/netrom.h>
31
32static void nr_heartbeat_expiry(unsigned long);
33static void nr_t1timer_expiry(unsigned long);
34static void nr_t2timer_expiry(unsigned long);
35static void nr_t4timer_expiry(unsigned long);
36static void nr_idletimer_expiry(unsigned long);
37
38void nr_init_timers(struct sock *sk)
39{
40 struct nr_sock *nr = nr_sk(sk);
41
42 setup_timer(&nr->t1timer, nr_t1timer_expiry, (unsigned long)sk);
43 setup_timer(&nr->t2timer, nr_t2timer_expiry, (unsigned long)sk);
44 setup_timer(&nr->t4timer, nr_t4timer_expiry, (unsigned long)sk);
45 setup_timer(&nr->idletimer, nr_idletimer_expiry, (unsigned long)sk);
46
47 /* initialized by sock_init_data */
48 sk->sk_timer.data = (unsigned long)sk;
49 sk->sk_timer.function = &nr_heartbeat_expiry;
50}
51
52void nr_start_t1timer(struct sock *sk)
53{
54 struct nr_sock *nr = nr_sk(sk);
55
56 mod_timer(&nr->t1timer, jiffies + nr->t1);
57}
58
59void nr_start_t2timer(struct sock *sk)
60{
61 struct nr_sock *nr = nr_sk(sk);
62
63 mod_timer(&nr->t2timer, jiffies + nr->t2);
64}
65
66void nr_start_t4timer(struct sock *sk)
67{
68 struct nr_sock *nr = nr_sk(sk);
69
70 mod_timer(&nr->t4timer, jiffies + nr->t4);
71}
72
73void nr_start_idletimer(struct sock *sk)
74{
75 struct nr_sock *nr = nr_sk(sk);
76
77 if (nr->idle > 0)
78 mod_timer(&nr->idletimer, jiffies + nr->idle);
79}
80
81void nr_start_heartbeat(struct sock *sk)
82{
83 mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
84}
85
86void nr_stop_t1timer(struct sock *sk)
87{
88 del_timer(&nr_sk(sk)->t1timer);
89}
90
91void nr_stop_t2timer(struct sock *sk)
92{
93 del_timer(&nr_sk(sk)->t2timer);
94}
95
96void nr_stop_t4timer(struct sock *sk)
97{
98 del_timer(&nr_sk(sk)->t4timer);
99}
100
101void nr_stop_idletimer(struct sock *sk)
102{
103 del_timer(&nr_sk(sk)->idletimer);
104}
105
106void nr_stop_heartbeat(struct sock *sk)
107{
108 del_timer(&sk->sk_timer);
109}
110
111int nr_t1timer_running(struct sock *sk)
112{
113 return timer_pending(&nr_sk(sk)->t1timer);
114}
115
116static void nr_heartbeat_expiry(unsigned long param)
117{
118 struct sock *sk = (struct sock *)param;
119 struct nr_sock *nr = nr_sk(sk);
120
121 bh_lock_sock(sk);
122 switch (nr->state) {
123 case NR_STATE_0:
124 /* Magic here: If we listen() and a new link dies before it
125 is accepted() it isn't 'dead' so doesn't get removed. */
126 if (sock_flag(sk, SOCK_DESTROY) ||
127 (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
128 sock_hold(sk);
129 bh_unlock_sock(sk);
130 nr_destroy_socket(sk);
131 sock_put(sk);
132 return;
133 }
134 break;
135
136 case NR_STATE_3:
137 /*
138 * Check for the state of the receive buffer.
139 */
140 if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
141 (nr->condition & NR_COND_OWN_RX_BUSY)) {
142 nr->condition &= ~NR_COND_OWN_RX_BUSY;
143 nr->condition &= ~NR_COND_ACK_PENDING;
144 nr->vl = nr->vr;
145 nr_write_internal(sk, NR_INFOACK);
146 break;
147 }
148 break;
149 }
150
151 nr_start_heartbeat(sk);
152 bh_unlock_sock(sk);
153}
154
155static void nr_t2timer_expiry(unsigned long param)
156{
157 struct sock *sk = (struct sock *)param;
158 struct nr_sock *nr = nr_sk(sk);
159
160 bh_lock_sock(sk);
161 if (nr->condition & NR_COND_ACK_PENDING) {
162 nr->condition &= ~NR_COND_ACK_PENDING;
163 nr_enquiry_response(sk);
164 }
165 bh_unlock_sock(sk);
166}
167
168static void nr_t4timer_expiry(unsigned long param)
169{
170 struct sock *sk = (struct sock *)param;
171
172 bh_lock_sock(sk);
173 nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
174 bh_unlock_sock(sk);
175}
176
177static void nr_idletimer_expiry(unsigned long param)
178{
179 struct sock *sk = (struct sock *)param;
180 struct nr_sock *nr = nr_sk(sk);
181
182 bh_lock_sock(sk);
183
184 nr_clear_queues(sk);
185
186 nr->n2count = 0;
187 nr_write_internal(sk, NR_DISCREQ);
188 nr->state = NR_STATE_2;
189
190 nr_start_t1timer(sk);
191 nr_stop_t2timer(sk);
192 nr_stop_t4timer(sk);
193
194 sk->sk_state = TCP_CLOSE;
195 sk->sk_err = 0;
196 sk->sk_shutdown |= SEND_SHUTDOWN;
197
198 if (!sock_flag(sk, SOCK_DEAD)) {
199 sk->sk_state_change(sk);
200 sock_set_flag(sk, SOCK_DEAD);
201 }
202 bh_unlock_sock(sk);
203}
204
205static void nr_t1timer_expiry(unsigned long param)
206{
207 struct sock *sk = (struct sock *)param;
208 struct nr_sock *nr = nr_sk(sk);
209
210 bh_lock_sock(sk);
211 switch (nr->state) {
212 case NR_STATE_1:
213 if (nr->n2count == nr->n2) {
214 nr_disconnect(sk, ETIMEDOUT);
215 bh_unlock_sock(sk);
216 return;
217 } else {
218 nr->n2count++;
219 nr_write_internal(sk, NR_CONNREQ);
220 }
221 break;
222
223 case NR_STATE_2:
224 if (nr->n2count == nr->n2) {
225 nr_disconnect(sk, ETIMEDOUT);
226 bh_unlock_sock(sk);
227 return;
228 } else {
229 nr->n2count++;
230 nr_write_internal(sk, NR_DISCREQ);
231 }
232 break;
233
234 case NR_STATE_3:
235 if (nr->n2count == nr->n2) {
236 nr_disconnect(sk, ETIMEDOUT);
237 bh_unlock_sock(sk);
238 return;
239 } else {
240 nr->n2count++;
241 nr_requeue_frames(sk);
242 }
243 break;
244 }
245
246 nr_start_t1timer(sk);
247 bh_unlock_sock(sk);
248}
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) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
9 */
10#include <linux/errno.h>
11#include <linux/types.h>
12#include <linux/socket.h>
13#include <linux/in.h>
14#include <linux/kernel.h>
15#include <linux/jiffies.h>
16#include <linux/timer.h>
17#include <linux/string.h>
18#include <linux/sockios.h>
19#include <linux/net.h>
20#include <net/ax25.h>
21#include <linux/inet.h>
22#include <linux/netdevice.h>
23#include <linux/skbuff.h>
24#include <net/sock.h>
25#include <net/tcp_states.h>
26#include <asm/uaccess.h>
27#include <asm/system.h>
28#include <linux/fcntl.h>
29#include <linux/mm.h>
30#include <linux/interrupt.h>
31#include <net/netrom.h>
32
33static void nr_heartbeat_expiry(unsigned long);
34static void nr_t1timer_expiry(unsigned long);
35static void nr_t2timer_expiry(unsigned long);
36static void nr_t4timer_expiry(unsigned long);
37static void nr_idletimer_expiry(unsigned long);
38
39void nr_init_timers(struct sock *sk)
40{
41 struct nr_sock *nr = nr_sk(sk);
42
43 setup_timer(&nr->t1timer, nr_t1timer_expiry, (unsigned long)sk);
44 setup_timer(&nr->t2timer, nr_t2timer_expiry, (unsigned long)sk);
45 setup_timer(&nr->t4timer, nr_t4timer_expiry, (unsigned long)sk);
46 setup_timer(&nr->idletimer, nr_idletimer_expiry, (unsigned long)sk);
47
48 /* initialized by sock_init_data */
49 sk->sk_timer.data = (unsigned long)sk;
50 sk->sk_timer.function = &nr_heartbeat_expiry;
51}
52
53void nr_start_t1timer(struct sock *sk)
54{
55 struct nr_sock *nr = nr_sk(sk);
56
57 mod_timer(&nr->t1timer, jiffies + nr->t1);
58}
59
60void nr_start_t2timer(struct sock *sk)
61{
62 struct nr_sock *nr = nr_sk(sk);
63
64 mod_timer(&nr->t2timer, jiffies + nr->t2);
65}
66
67void nr_start_t4timer(struct sock *sk)
68{
69 struct nr_sock *nr = nr_sk(sk);
70
71 mod_timer(&nr->t4timer, jiffies + nr->t4);
72}
73
74void nr_start_idletimer(struct sock *sk)
75{
76 struct nr_sock *nr = nr_sk(sk);
77
78 if (nr->idle > 0)
79 mod_timer(&nr->idletimer, jiffies + nr->idle);
80}
81
82void nr_start_heartbeat(struct sock *sk)
83{
84 mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
85}
86
87void nr_stop_t1timer(struct sock *sk)
88{
89 del_timer(&nr_sk(sk)->t1timer);
90}
91
92void nr_stop_t2timer(struct sock *sk)
93{
94 del_timer(&nr_sk(sk)->t2timer);
95}
96
97void nr_stop_t4timer(struct sock *sk)
98{
99 del_timer(&nr_sk(sk)->t4timer);
100}
101
102void nr_stop_idletimer(struct sock *sk)
103{
104 del_timer(&nr_sk(sk)->idletimer);
105}
106
107void nr_stop_heartbeat(struct sock *sk)
108{
109 del_timer(&sk->sk_timer);
110}
111
112int nr_t1timer_running(struct sock *sk)
113{
114 return timer_pending(&nr_sk(sk)->t1timer);
115}
116
117static void nr_heartbeat_expiry(unsigned long param)
118{
119 struct sock *sk = (struct sock *)param;
120 struct nr_sock *nr = nr_sk(sk);
121
122 bh_lock_sock(sk);
123 switch (nr->state) {
124 case NR_STATE_0:
125 /* Magic here: If we listen() and a new link dies before it
126 is accepted() it isn't 'dead' so doesn't get removed. */
127 if (sock_flag(sk, SOCK_DESTROY) ||
128 (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
129 sock_hold(sk);
130 bh_unlock_sock(sk);
131 nr_destroy_socket(sk);
132 sock_put(sk);
133 return;
134 }
135 break;
136
137 case NR_STATE_3:
138 /*
139 * Check for the state of the receive buffer.
140 */
141 if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
142 (nr->condition & NR_COND_OWN_RX_BUSY)) {
143 nr->condition &= ~NR_COND_OWN_RX_BUSY;
144 nr->condition &= ~NR_COND_ACK_PENDING;
145 nr->vl = nr->vr;
146 nr_write_internal(sk, NR_INFOACK);
147 break;
148 }
149 break;
150 }
151
152 nr_start_heartbeat(sk);
153 bh_unlock_sock(sk);
154}
155
156static void nr_t2timer_expiry(unsigned long param)
157{
158 struct sock *sk = (struct sock *)param;
159 struct nr_sock *nr = nr_sk(sk);
160
161 bh_lock_sock(sk);
162 if (nr->condition & NR_COND_ACK_PENDING) {
163 nr->condition &= ~NR_COND_ACK_PENDING;
164 nr_enquiry_response(sk);
165 }
166 bh_unlock_sock(sk);
167}
168
169static void nr_t4timer_expiry(unsigned long param)
170{
171 struct sock *sk = (struct sock *)param;
172
173 bh_lock_sock(sk);
174 nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
175 bh_unlock_sock(sk);
176}
177
178static void nr_idletimer_expiry(unsigned long param)
179{
180 struct sock *sk = (struct sock *)param;
181 struct nr_sock *nr = nr_sk(sk);
182
183 bh_lock_sock(sk);
184
185 nr_clear_queues(sk);
186
187 nr->n2count = 0;
188 nr_write_internal(sk, NR_DISCREQ);
189 nr->state = NR_STATE_2;
190
191 nr_start_t1timer(sk);
192 nr_stop_t2timer(sk);
193 nr_stop_t4timer(sk);
194
195 sk->sk_state = TCP_CLOSE;
196 sk->sk_err = 0;
197 sk->sk_shutdown |= SEND_SHUTDOWN;
198
199 if (!sock_flag(sk, SOCK_DEAD)) {
200 sk->sk_state_change(sk);
201 sock_set_flag(sk, SOCK_DEAD);
202 }
203 bh_unlock_sock(sk);
204}
205
206static void nr_t1timer_expiry(unsigned long param)
207{
208 struct sock *sk = (struct sock *)param;
209 struct nr_sock *nr = nr_sk(sk);
210
211 bh_lock_sock(sk);
212 switch (nr->state) {
213 case NR_STATE_1:
214 if (nr->n2count == nr->n2) {
215 nr_disconnect(sk, ETIMEDOUT);
216 bh_unlock_sock(sk);
217 return;
218 } else {
219 nr->n2count++;
220 nr_write_internal(sk, NR_CONNREQ);
221 }
222 break;
223
224 case NR_STATE_2:
225 if (nr->n2count == nr->n2) {
226 nr_disconnect(sk, ETIMEDOUT);
227 bh_unlock_sock(sk);
228 return;
229 } else {
230 nr->n2count++;
231 nr_write_internal(sk, NR_DISCREQ);
232 }
233 break;
234
235 case NR_STATE_3:
236 if (nr->n2count == nr->n2) {
237 nr_disconnect(sk, ETIMEDOUT);
238 bh_unlock_sock(sk);
239 return;
240 } else {
241 nr->n2count++;
242 nr_requeue_frames(sk);
243 }
244 break;
245 }
246
247 nr_start_t1timer(sk);
248 bh_unlock_sock(sk);
249}