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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> | |
c752f073 | 25 | #include <net/tcp_states.h> |
1da177e4 LT |
26 | #include <linux/fcntl.h> |
27 | #include <linux/mm.h> | |
28 | #include <linux/interrupt.h> | |
29 | #include <net/rose.h> | |
30 | ||
99767f27 | 31 | static void rose_heartbeat_expiry(struct timer_list *t); |
4966babd KC |
32 | static void rose_timer_expiry(struct timer_list *); |
33 | static void rose_idletimer_expiry(struct timer_list *); | |
1da177e4 LT |
34 | |
35 | void rose_start_heartbeat(struct sock *sk) | |
36 | { | |
37 | del_timer(&sk->sk_timer); | |
38 | ||
841b86f3 | 39 | sk->sk_timer.function = rose_heartbeat_expiry; |
1da177e4 LT |
40 | sk->sk_timer.expires = jiffies + 5 * HZ; |
41 | ||
42 | add_timer(&sk->sk_timer); | |
43 | } | |
44 | ||
45 | void rose_start_t1timer(struct sock *sk) | |
46 | { | |
47 | struct rose_sock *rose = rose_sk(sk); | |
48 | ||
49 | del_timer(&rose->timer); | |
50 | ||
841b86f3 | 51 | rose->timer.function = rose_timer_expiry; |
1da177e4 LT |
52 | rose->timer.expires = jiffies + rose->t1; |
53 | ||
54 | add_timer(&rose->timer); | |
55 | } | |
56 | ||
57 | void rose_start_t2timer(struct sock *sk) | |
58 | { | |
59 | struct rose_sock *rose = rose_sk(sk); | |
60 | ||
61 | del_timer(&rose->timer); | |
62 | ||
841b86f3 | 63 | rose->timer.function = rose_timer_expiry; |
1da177e4 LT |
64 | rose->timer.expires = jiffies + rose->t2; |
65 | ||
66 | add_timer(&rose->timer); | |
67 | } | |
68 | ||
69 | void rose_start_t3timer(struct sock *sk) | |
70 | { | |
71 | struct rose_sock *rose = rose_sk(sk); | |
72 | ||
73 | del_timer(&rose->timer); | |
74 | ||
841b86f3 | 75 | rose->timer.function = rose_timer_expiry; |
1da177e4 LT |
76 | rose->timer.expires = jiffies + rose->t3; |
77 | ||
78 | add_timer(&rose->timer); | |
79 | } | |
80 | ||
81 | void rose_start_hbtimer(struct sock *sk) | |
82 | { | |
83 | struct rose_sock *rose = rose_sk(sk); | |
84 | ||
85 | del_timer(&rose->timer); | |
86 | ||
841b86f3 | 87 | rose->timer.function = rose_timer_expiry; |
1da177e4 LT |
88 | rose->timer.expires = jiffies + rose->hb; |
89 | ||
90 | add_timer(&rose->timer); | |
91 | } | |
92 | ||
93 | void rose_start_idletimer(struct sock *sk) | |
94 | { | |
95 | struct rose_sock *rose = rose_sk(sk); | |
96 | ||
97 | del_timer(&rose->idletimer); | |
98 | ||
99 | if (rose->idle > 0) { | |
841b86f3 | 100 | rose->idletimer.function = rose_idletimer_expiry; |
1da177e4 LT |
101 | rose->idletimer.expires = jiffies + rose->idle; |
102 | ||
103 | add_timer(&rose->idletimer); | |
104 | } | |
105 | } | |
106 | ||
107 | void rose_stop_heartbeat(struct sock *sk) | |
108 | { | |
109 | del_timer(&sk->sk_timer); | |
110 | } | |
111 | ||
112 | void rose_stop_timer(struct sock *sk) | |
113 | { | |
114 | del_timer(&rose_sk(sk)->timer); | |
115 | } | |
116 | ||
117 | void rose_stop_idletimer(struct sock *sk) | |
118 | { | |
119 | del_timer(&rose_sk(sk)->idletimer); | |
120 | } | |
121 | ||
99767f27 | 122 | static void rose_heartbeat_expiry(struct timer_list *t) |
1da177e4 | 123 | { |
99767f27 | 124 | struct sock *sk = from_timer(sk, t, sk_timer); |
1da177e4 LT |
125 | struct rose_sock *rose = rose_sk(sk); |
126 | ||
127 | bh_lock_sock(sk); | |
128 | switch (rose->state) { | |
129 | case ROSE_STATE_0: | |
130 | /* Magic here: If we listen() and a new link dies before it | |
131 | is accepted() it isn't 'dead' so doesn't get removed. */ | |
132 | if (sock_flag(sk, SOCK_DESTROY) || | |
133 | (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) { | |
a3d7a9d7 | 134 | bh_unlock_sock(sk); |
1da177e4 LT |
135 | rose_destroy_socket(sk); |
136 | return; | |
137 | } | |
138 | break; | |
139 | ||
140 | case ROSE_STATE_3: | |
141 | /* | |
142 | * Check for the state of the receive buffer. | |
143 | */ | |
144 | if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) && | |
145 | (rose->condition & ROSE_COND_OWN_RX_BUSY)) { | |
146 | rose->condition &= ~ROSE_COND_OWN_RX_BUSY; | |
147 | rose->condition &= ~ROSE_COND_ACK_PENDING; | |
148 | rose->vl = rose->vr; | |
149 | rose_write_internal(sk, ROSE_RR); | |
150 | rose_stop_timer(sk); /* HB */ | |
151 | break; | |
152 | } | |
153 | break; | |
154 | } | |
155 | ||
156 | rose_start_heartbeat(sk); | |
157 | bh_unlock_sock(sk); | |
158 | } | |
159 | ||
4966babd | 160 | static void rose_timer_expiry(struct timer_list *t) |
1da177e4 | 161 | { |
4966babd KC |
162 | struct rose_sock *rose = from_timer(rose, t, timer); |
163 | struct sock *sk = &rose->sock; | |
1da177e4 LT |
164 | |
165 | bh_lock_sock(sk); | |
166 | switch (rose->state) { | |
167 | case ROSE_STATE_1: /* T1 */ | |
168 | case ROSE_STATE_4: /* T2 */ | |
169 | rose_write_internal(sk, ROSE_CLEAR_REQUEST); | |
170 | rose->state = ROSE_STATE_2; | |
171 | rose_start_t3timer(sk); | |
172 | break; | |
173 | ||
174 | case ROSE_STATE_2: /* T3 */ | |
175 | rose->neighbour->use--; | |
176 | rose_disconnect(sk, ETIMEDOUT, -1, -1); | |
177 | break; | |
178 | ||
179 | case ROSE_STATE_3: /* HB */ | |
180 | if (rose->condition & ROSE_COND_ACK_PENDING) { | |
181 | rose->condition &= ~ROSE_COND_ACK_PENDING; | |
182 | rose_enquiry_response(sk); | |
183 | } | |
184 | break; | |
185 | } | |
186 | bh_unlock_sock(sk); | |
187 | } | |
188 | ||
4966babd | 189 | static void rose_idletimer_expiry(struct timer_list *t) |
1da177e4 | 190 | { |
4966babd KC |
191 | struct rose_sock *rose = from_timer(rose, t, idletimer); |
192 | struct sock *sk = &rose->sock; | |
1da177e4 LT |
193 | |
194 | bh_lock_sock(sk); | |
195 | rose_clear_queues(sk); | |
196 | ||
197 | rose_write_internal(sk, ROSE_CLEAR_REQUEST); | |
198 | rose_sk(sk)->state = ROSE_STATE_2; | |
199 | ||
200 | rose_start_t3timer(sk); | |
201 | ||
202 | sk->sk_state = TCP_CLOSE; | |
203 | sk->sk_err = 0; | |
204 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
205 | ||
206 | if (!sock_flag(sk, SOCK_DEAD)) { | |
207 | sk->sk_state_change(sk); | |
208 | sock_set_flag(sk, SOCK_DEAD); | |
209 | } | |
210 | bh_unlock_sock(sk); | |
211 | } |