[NETROM/AX.25/ROSE]: Remove useless tests
[linux-3.10.git] / net / rose / rose_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/system.h>
27 #include <linux/fcntl.h>
28 #include <linux/mm.h>
29 #include <linux/interrupt.h>
30 #include <net/rose.h>
31
32 static void rose_heartbeat_expiry(unsigned long);
33 static void rose_timer_expiry(unsigned long);
34 static void rose_idletimer_expiry(unsigned long);
35
36 void rose_start_heartbeat(struct sock *sk)
37 {
38         del_timer(&sk->sk_timer);
39
40         sk->sk_timer.data     = (unsigned long)sk;
41         sk->sk_timer.function = &rose_heartbeat_expiry;
42         sk->sk_timer.expires  = jiffies + 5 * HZ;
43
44         add_timer(&sk->sk_timer);
45 }
46
47 void rose_start_t1timer(struct sock *sk)
48 {
49         struct rose_sock *rose = rose_sk(sk);
50
51         del_timer(&rose->timer);
52
53         rose->timer.data     = (unsigned long)sk;
54         rose->timer.function = &rose_timer_expiry;
55         rose->timer.expires  = jiffies + rose->t1;
56
57         add_timer(&rose->timer);
58 }
59
60 void rose_start_t2timer(struct sock *sk)
61 {
62         struct rose_sock *rose = rose_sk(sk);
63
64         del_timer(&rose->timer);
65
66         rose->timer.data     = (unsigned long)sk;
67         rose->timer.function = &rose_timer_expiry;
68         rose->timer.expires  = jiffies + rose->t2;
69
70         add_timer(&rose->timer);
71 }
72
73 void rose_start_t3timer(struct sock *sk)
74 {
75         struct rose_sock *rose = rose_sk(sk);
76
77         del_timer(&rose->timer);
78
79         rose->timer.data     = (unsigned long)sk;
80         rose->timer.function = &rose_timer_expiry;
81         rose->timer.expires  = jiffies + rose->t3;
82
83         add_timer(&rose->timer);
84 }
85
86 void rose_start_hbtimer(struct sock *sk)
87 {
88         struct rose_sock *rose = rose_sk(sk);
89
90         del_timer(&rose->timer);
91
92         rose->timer.data     = (unsigned long)sk;
93         rose->timer.function = &rose_timer_expiry;
94         rose->timer.expires  = jiffies + rose->hb;
95
96         add_timer(&rose->timer);
97 }
98
99 void rose_start_idletimer(struct sock *sk)
100 {
101         struct rose_sock *rose = rose_sk(sk);
102
103         del_timer(&rose->idletimer);
104
105         if (rose->idle > 0) {
106                 rose->idletimer.data     = (unsigned long)sk;
107                 rose->idletimer.function = &rose_idletimer_expiry;
108                 rose->idletimer.expires  = jiffies + rose->idle;
109
110                 add_timer(&rose->idletimer);
111         }
112 }
113
114 void rose_stop_heartbeat(struct sock *sk)
115 {
116         del_timer(&sk->sk_timer);
117 }
118
119 void rose_stop_timer(struct sock *sk)
120 {
121         del_timer(&rose_sk(sk)->timer);
122 }
123
124 void rose_stop_idletimer(struct sock *sk)
125 {
126         del_timer(&rose_sk(sk)->idletimer);
127 }
128
129 static void rose_heartbeat_expiry(unsigned long param)
130 {
131         struct sock *sk = (struct sock *)param;
132         struct rose_sock *rose = rose_sk(sk);
133
134         bh_lock_sock(sk);
135         switch (rose->state) {
136         case ROSE_STATE_0:
137                 /* Magic here: If we listen() and a new link dies before it
138                    is accepted() it isn't 'dead' so doesn't get removed. */
139                 if (sock_flag(sk, SOCK_DESTROY) ||
140                     (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
141                         rose_destroy_socket(sk);
142                         return;
143                 }
144                 break;
145
146         case ROSE_STATE_3:
147                 /*
148                  * Check for the state of the receive buffer.
149                  */
150                 if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
151                     (rose->condition & ROSE_COND_OWN_RX_BUSY)) {
152                         rose->condition &= ~ROSE_COND_OWN_RX_BUSY;
153                         rose->condition &= ~ROSE_COND_ACK_PENDING;
154                         rose->vl         = rose->vr;
155                         rose_write_internal(sk, ROSE_RR);
156                         rose_stop_timer(sk);    /* HB */
157                         break;
158                 }
159                 break;
160         }
161
162         rose_start_heartbeat(sk);
163         bh_unlock_sock(sk);
164 }
165
166 static void rose_timer_expiry(unsigned long param)
167 {
168         struct sock *sk = (struct sock *)param;
169         struct rose_sock *rose = rose_sk(sk);
170
171         bh_lock_sock(sk);
172         switch (rose->state) {
173         case ROSE_STATE_1:      /* T1 */
174         case ROSE_STATE_4:      /* T2 */
175                 rose_write_internal(sk, ROSE_CLEAR_REQUEST);
176                 rose->state = ROSE_STATE_2;
177                 rose_start_t3timer(sk);
178                 break;
179
180         case ROSE_STATE_2:      /* T3 */
181                 rose->neighbour->use--;
182                 rose_disconnect(sk, ETIMEDOUT, -1, -1);
183                 break;
184
185         case ROSE_STATE_3:      /* HB */
186                 if (rose->condition & ROSE_COND_ACK_PENDING) {
187                         rose->condition &= ~ROSE_COND_ACK_PENDING;
188                         rose_enquiry_response(sk);
189                 }
190                 break;
191         }
192         bh_unlock_sock(sk);
193 }
194
195 static void rose_idletimer_expiry(unsigned long param)
196 {
197         struct sock *sk = (struct sock *)param;
198
199         bh_lock_sock(sk);
200         rose_clear_queues(sk);
201
202         rose_write_internal(sk, ROSE_CLEAR_REQUEST);
203         rose_sk(sk)->state = ROSE_STATE_2;
204
205         rose_start_t3timer(sk);
206
207         sk->sk_state     = TCP_CLOSE;
208         sk->sk_err       = 0;
209         sk->sk_shutdown |= SEND_SHUTDOWN;
210
211         if (!sock_flag(sk, SOCK_DEAD)) {
212                 sk->sk_state_change(sk);
213                 sock_set_flag(sk, SOCK_DEAD);
214         }
215         bh_unlock_sock(sk);
216 }