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1da177e4 LT |
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.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 | } |