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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
31static void rose_heartbeat_expiry(unsigned long);
32static void rose_timer_expiry(unsigned long);
33static void rose_idletimer_expiry(unsigned long);
34
35void 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
46void 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
59void 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
72void 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
85void 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
98void 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
113void rose_stop_heartbeat(struct sock *sk)
114{
115 del_timer(&sk->sk_timer);
116}
117
118void rose_stop_timer(struct sock *sk)
119{
120 del_timer(&rose_sk(sk)->timer);
121}
122
123void rose_stop_idletimer(struct sock *sk)
124{
125 del_timer(&rose_sk(sk)->idletimer);
126}
127
128static 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
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}
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
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 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
167static 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
196static 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}