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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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.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
32static void rose_heartbeat_expiry(unsigned long);
33static void rose_timer_expiry(unsigned long);
34static void rose_idletimer_expiry(unsigned long);
35
36void 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
47void 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
60void 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
73void 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
86void 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
99void 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
114void rose_stop_heartbeat(struct sock *sk)
115{
116 del_timer(&sk->sk_timer);
117}
118
119void rose_stop_timer(struct sock *sk)
120{
121 del_timer(&rose_sk(sk)->timer);
122}
123
124void rose_stop_idletimer(struct sock *sk)
125{
126 del_timer(&rose_sk(sk)->idletimer);
127}
128
129static 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
166static 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
195static 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}