[NETROM]: Remove unessecary lock_sock calls in netrom_ioctl()
[linux-2.6.git] / net / netrom / nr_timer.c
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         init_timer(&nr->t1timer);
44         nr->t1timer.data     = (unsigned long)sk;
45         nr->t1timer.function = &nr_t1timer_expiry;
46         
47         init_timer(&nr->t2timer);
48         nr->t2timer.data     = (unsigned long)sk;
49         nr->t2timer.function = &nr_t2timer_expiry;
50
51         init_timer(&nr->t4timer);
52         nr->t4timer.data     = (unsigned long)sk;
53         nr->t4timer.function = &nr_t4timer_expiry;
54
55         init_timer(&nr->idletimer);
56         nr->idletimer.data     = (unsigned long)sk;
57         nr->idletimer.function = &nr_idletimer_expiry;
58
59         /* initialized by sock_init_data */
60         sk->sk_timer.data     = (unsigned long)sk;
61         sk->sk_timer.function = &nr_heartbeat_expiry;
62 }
63
64 void nr_start_t1timer(struct sock *sk)
65 {
66         struct nr_sock *nr = nr_sk(sk);
67
68         mod_timer(&nr->t1timer, jiffies + nr->t1);
69 }
70
71 void nr_start_t2timer(struct sock *sk)
72 {
73         struct nr_sock *nr = nr_sk(sk);
74
75         mod_timer(&nr->t2timer, jiffies + nr->t2);
76 }
77
78 void nr_start_t4timer(struct sock *sk)
79 {
80         struct nr_sock *nr = nr_sk(sk);
81
82         mod_timer(&nr->t4timer, jiffies + nr->t4);
83 }
84
85 void nr_start_idletimer(struct sock *sk)
86 {
87         struct nr_sock *nr = nr_sk(sk);
88
89         if (nr->idle > 0)
90                 mod_timer(&nr->idletimer, jiffies + nr->idle);
91 }
92
93 void nr_start_heartbeat(struct sock *sk)
94 {
95         mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
96 }
97
98 void nr_stop_t1timer(struct sock *sk)
99 {
100         del_timer(&nr_sk(sk)->t1timer);
101 }
102
103 void nr_stop_t2timer(struct sock *sk)
104 {
105         del_timer(&nr_sk(sk)->t2timer);
106 }
107
108 void nr_stop_t4timer(struct sock *sk)
109 {
110         del_timer(&nr_sk(sk)->t4timer);
111 }
112
113 void nr_stop_idletimer(struct sock *sk)
114 {
115         del_timer(&nr_sk(sk)->idletimer);
116 }
117
118 void nr_stop_heartbeat(struct sock *sk)
119 {
120         del_timer(&sk->sk_timer);
121 }
122
123 int nr_t1timer_running(struct sock *sk)
124 {
125         return timer_pending(&nr_sk(sk)->t1timer);
126 }
127
128 static void nr_heartbeat_expiry(unsigned long param)
129 {
130         struct sock *sk = (struct sock *)param;
131         struct nr_sock *nr = nr_sk(sk);
132
133         bh_lock_sock(sk);
134         switch (nr->state) {
135         case NR_STATE_0:
136                 /* Magic here: If we listen() and a new link dies before it
137                    is accepted() it isn't 'dead' so doesn't get removed. */
138                 if (sock_flag(sk, SOCK_DESTROY) ||
139                     (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
140                         sock_hold(sk);
141                         nr_destroy_socket(sk);
142                         bh_unlock_sock(sk);
143                         sock_put(sk);
144                         return;
145                 }
146                 break;
147
148         case NR_STATE_3:
149                 /*
150                  * Check for the state of the receive buffer.
151                  */
152                 if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
153                     (nr->condition & NR_COND_OWN_RX_BUSY)) {
154                         nr->condition &= ~NR_COND_OWN_RX_BUSY;
155                         nr->condition &= ~NR_COND_ACK_PENDING;
156                         nr->vl         = nr->vr;
157                         nr_write_internal(sk, NR_INFOACK);
158                         break;
159                 }
160                 break;
161         }
162
163         nr_start_heartbeat(sk);
164         bh_unlock_sock(sk);
165 }
166
167 static void nr_t2timer_expiry(unsigned long param)
168 {
169         struct sock *sk = (struct sock *)param;
170         struct nr_sock *nr = nr_sk(sk);
171
172         bh_lock_sock(sk);
173         if (nr->condition & NR_COND_ACK_PENDING) {
174                 nr->condition &= ~NR_COND_ACK_PENDING;
175                 nr_enquiry_response(sk);
176         }
177         bh_unlock_sock(sk);
178 }
179
180 static void nr_t4timer_expiry(unsigned long param)
181 {
182         struct sock *sk = (struct sock *)param;
183
184         bh_lock_sock(sk);
185         nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
186         bh_unlock_sock(sk);
187 }
188
189 static void nr_idletimer_expiry(unsigned long param)
190 {
191         struct sock *sk = (struct sock *)param;
192         struct nr_sock *nr = nr_sk(sk);
193
194         bh_lock_sock(sk);
195
196         nr_clear_queues(sk);
197
198         nr->n2count = 0;
199         nr_write_internal(sk, NR_DISCREQ);
200         nr->state = NR_STATE_2;
201
202         nr_start_t1timer(sk);
203         nr_stop_t2timer(sk);
204         nr_stop_t4timer(sk);
205
206         sk->sk_state     = TCP_CLOSE;
207         sk->sk_err       = 0;
208         sk->sk_shutdown |= SEND_SHUTDOWN;
209
210         if (!sock_flag(sk, SOCK_DEAD)) {
211                 sk->sk_state_change(sk);
212                 sock_set_flag(sk, SOCK_DEAD);
213         }
214         bh_unlock_sock(sk);
215 }
216
217 static void nr_t1timer_expiry(unsigned long param)
218 {
219         struct sock *sk = (struct sock *)param;
220         struct nr_sock *nr = nr_sk(sk);
221
222         bh_lock_sock(sk);
223         switch (nr->state) {
224         case NR_STATE_1:
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_CONNREQ);
232                 }
233                 break;
234
235         case NR_STATE_2:
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_write_internal(sk, NR_DISCREQ);
243                 }
244                 break;
245
246         case NR_STATE_3:
247                 if (nr->n2count == nr->n2) {
248                         nr_disconnect(sk, ETIMEDOUT);
249                         bh_unlock_sock(sk);
250                         return;
251                 } else {
252                         nr->n2count++;
253                         nr_requeue_frames(sk);
254                 }
255                 break;
256         }
257
258         nr_start_t1timer(sk);
259         bh_unlock_sock(sk);
260 }