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 bh_unlock_sock(sk);
142 rose_destroy_socket(sk);
143 return;
144 }
145 break;
146
147 case ROSE_STATE_3:
148 /*
149 * Check for the state of the receive buffer.
150 */
151 if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
152 (rose->condition & ROSE_COND_OWN_RX_BUSY)) {
153 rose->condition &= ~ROSE_COND_OWN_RX_BUSY;
154 rose->condition &= ~ROSE_COND_ACK_PENDING;
155 rose->vl = rose->vr;
156 rose_write_internal(sk, ROSE_RR);
157 rose_stop_timer(sk); /* HB */
158 break;
159 }
160 break;
161 }
162
163 rose_start_heartbeat(sk);
164 bh_unlock_sock(sk);
165 }
166
167 static void rose_timer_expiry(unsigned long param)
168 {
169 struct sock *sk = (struct sock *)param;
170 struct rose_sock *rose = rose_sk(sk);
171
172 bh_lock_sock(sk);
173 switch (rose->state) {
174 case ROSE_STATE_1: /* T1 */
175 case ROSE_STATE_4: /* T2 */
176 rose_write_internal(sk, ROSE_CLEAR_REQUEST);
177 rose->state = ROSE_STATE_2;
178 rose_start_t3timer(sk);
179 break;
180
181 case ROSE_STATE_2: /* T3 */
182 rose->neighbour->use--;
183 rose_disconnect(sk, ETIMEDOUT, -1, -1);
184 break;
185
186 case ROSE_STATE_3: /* HB */
187 if (rose->condition & ROSE_COND_ACK_PENDING) {
188 rose->condition &= ~ROSE_COND_ACK_PENDING;
189 rose_enquiry_response(sk);
190 }
191 break;
192 }
193 bh_unlock_sock(sk);
194 }
195
196 static void rose_idletimer_expiry(unsigned long param)
197 {
198 struct sock *sk = (struct sock *)param;
199
200 bh_lock_sock(sk);
201 rose_clear_queues(sk);
202
203 rose_write_internal(sk, ROSE_CLEAR_REQUEST);
204 rose_sk(sk)->state = ROSE_STATE_2;
205
206 rose_start_t3timer(sk);
207
208 sk->sk_state = TCP_CLOSE;
209 sk->sk_err = 0;
210 sk->sk_shutdown |= SEND_SHUTDOWN;
211
212 if (!sock_flag(sk, SOCK_DEAD)) {
213 sk->sk_state_change(sk);
214 sock_set_flag(sk, SOCK_DEAD);
215 }
216 bh_unlock_sock(sk);
217 }
218
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