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 <linux/fcntl.h>
27 #include <linux/mm.h>
28 #include <linux/interrupt.h>
29 #include <net/rose.h>
30
31 static void rose_heartbeat_expiry(unsigned long);
32 static void rose_timer_expiry(unsigned long);
33 static void rose_idletimer_expiry(unsigned long);
34
rose_start_heartbeat(struct sock * sk)35 void rose_start_heartbeat(struct sock *sk)
36 {
37 del_timer(&sk->sk_timer);
38
39 sk->sk_timer.data = (unsigned long)sk;
40 sk->sk_timer.function = &rose_heartbeat_expiry;
41 sk->sk_timer.expires = jiffies + 5 * HZ;
42
43 add_timer(&sk->sk_timer);
44 }
45
rose_start_t1timer(struct sock * sk)46 void rose_start_t1timer(struct sock *sk)
47 {
48 struct rose_sock *rose = rose_sk(sk);
49
50 del_timer(&rose->timer);
51
52 rose->timer.data = (unsigned long)sk;
53 rose->timer.function = &rose_timer_expiry;
54 rose->timer.expires = jiffies + rose->t1;
55
56 add_timer(&rose->timer);
57 }
58
rose_start_t2timer(struct sock * sk)59 void rose_start_t2timer(struct sock *sk)
60 {
61 struct rose_sock *rose = rose_sk(sk);
62
63 del_timer(&rose->timer);
64
65 rose->timer.data = (unsigned long)sk;
66 rose->timer.function = &rose_timer_expiry;
67 rose->timer.expires = jiffies + rose->t2;
68
69 add_timer(&rose->timer);
70 }
71
rose_start_t3timer(struct sock * sk)72 void rose_start_t3timer(struct sock *sk)
73 {
74 struct rose_sock *rose = rose_sk(sk);
75
76 del_timer(&rose->timer);
77
78 rose->timer.data = (unsigned long)sk;
79 rose->timer.function = &rose_timer_expiry;
80 rose->timer.expires = jiffies + rose->t3;
81
82 add_timer(&rose->timer);
83 }
84
rose_start_hbtimer(struct sock * sk)85 void rose_start_hbtimer(struct sock *sk)
86 {
87 struct rose_sock *rose = rose_sk(sk);
88
89 del_timer(&rose->timer);
90
91 rose->timer.data = (unsigned long)sk;
92 rose->timer.function = &rose_timer_expiry;
93 rose->timer.expires = jiffies + rose->hb;
94
95 add_timer(&rose->timer);
96 }
97
rose_start_idletimer(struct sock * sk)98 void rose_start_idletimer(struct sock *sk)
99 {
100 struct rose_sock *rose = rose_sk(sk);
101
102 del_timer(&rose->idletimer);
103
104 if (rose->idle > 0) {
105 rose->idletimer.data = (unsigned long)sk;
106 rose->idletimer.function = &rose_idletimer_expiry;
107 rose->idletimer.expires = jiffies + rose->idle;
108
109 add_timer(&rose->idletimer);
110 }
111 }
112
rose_stop_heartbeat(struct sock * sk)113 void rose_stop_heartbeat(struct sock *sk)
114 {
115 del_timer(&sk->sk_timer);
116 }
117
rose_stop_timer(struct sock * sk)118 void rose_stop_timer(struct sock *sk)
119 {
120 del_timer(&rose_sk(sk)->timer);
121 }
122
rose_stop_idletimer(struct sock * sk)123 void rose_stop_idletimer(struct sock *sk)
124 {
125 del_timer(&rose_sk(sk)->idletimer);
126 }
127
rose_heartbeat_expiry(unsigned long param)128 static void rose_heartbeat_expiry(unsigned long param)
129 {
130 struct sock *sk = (struct sock *)param;
131 struct rose_sock *rose = rose_sk(sk);
132
133 bh_lock_sock(sk);
134 switch (rose->state) {
135 case ROSE_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 bh_unlock_sock(sk);
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
rose_timer_expiry(unsigned long param)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
rose_idletimer_expiry(unsigned long param)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 }
217