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
33 static void nr_heartbeat_expiry(unsigned long);
34 static void nr_t1timer_expiry(unsigned long);
35 static void nr_t2timer_expiry(unsigned long);
36 static void nr_t4timer_expiry(unsigned long);
37 static void nr_idletimer_expiry(unsigned long);
38
39 void 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
53 void 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
60 void 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
67 void 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
74 void 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
82 void nr_start_heartbeat(struct sock *sk)
83 {
84 mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
85 }
86
87 void nr_stop_t1timer(struct sock *sk)
88 {
89 del_timer(&nr_sk(sk)->t1timer);
90 }
91
92 void nr_stop_t2timer(struct sock *sk)
93 {
94 del_timer(&nr_sk(sk)->t2timer);
95 }
96
97 void nr_stop_t4timer(struct sock *sk)
98 {
99 del_timer(&nr_sk(sk)->t4timer);
100 }
101
102 void nr_stop_idletimer(struct sock *sk)
103 {
104 del_timer(&nr_sk(sk)->idletimer);
105 }
106
107 void nr_stop_heartbeat(struct sock *sk)
108 {
109 del_timer(&sk->sk_timer);
110 }
111
112 int nr_t1timer_running(struct sock *sk)
113 {
114 return timer_pending(&nr_sk(sk)->t1timer);
115 }
116
117 static 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
156 static 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
169 static 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
178 static 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
206 static 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 }
250
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