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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) Joerg Reuter DL1BKE (jreuter@yaina.de) |
9 | */ |
10 | #include <linux/errno.h> |
11 | #include <linux/types.h> |
12 | #include <linux/socket.h> |
13 | #include <linux/spinlock.h> |
14 | #include <linux/in.h> |
15 | #include <linux/kernel.h> |
16 | #include <linux/jiffies.h> |
17 | #include <linux/timer.h> |
18 | #include <linux/string.h> |
19 | #include <linux/sockios.h> |
20 | #include <linux/net.h> |
21 | #include <net/tcp_states.h> |
22 | #include <net/ax25.h> |
23 | #include <linux/inet.h> |
24 | #include <linux/netdevice.h> |
25 | #include <linux/skbuff.h> |
26 | #include <net/sock.h> |
27 | #include <asm/uaccess.h> |
28 | #include <linux/fcntl.h> |
29 | #include <linux/mm.h> |
30 | #include <linux/interrupt.h> |
31 | |
32 | static void ax25_ds_timeout(unsigned long); |
33 | |
34 | /* |
35 | * Add DAMA slave timeout timer to timer list. |
36 | * Unlike the connection based timers the timeout function gets |
37 | * triggered every second. Please note that NET_AX25_DAMA_SLAVE_TIMEOUT |
38 | * (aka /proc/sys/net/ax25/{dev}/dama_slave_timeout) is still in |
39 | * 1/10th of a second. |
40 | */ |
41 | |
42 | void ax25_ds_setup_timer(ax25_dev *ax25_dev) |
43 | { |
44 | setup_timer(&ax25_dev->dama.slave_timer, ax25_ds_timeout, |
45 | (unsigned long)ax25_dev); |
46 | } |
47 | |
48 | void ax25_ds_del_timer(ax25_dev *ax25_dev) |
49 | { |
50 | if (ax25_dev) |
51 | del_timer(&ax25_dev->dama.slave_timer); |
52 | } |
53 | |
54 | void ax25_ds_set_timer(ax25_dev *ax25_dev) |
55 | { |
56 | if (ax25_dev == NULL) /* paranoia */ |
57 | return; |
58 | |
59 | ax25_dev->dama.slave_timeout = |
60 | msecs_to_jiffies(ax25_dev->values[AX25_VALUES_DS_TIMEOUT]) / 10; |
61 | mod_timer(&ax25_dev->dama.slave_timer, jiffies + HZ); |
62 | } |
63 | |
64 | /* |
65 | * DAMA Slave Timeout |
66 | * Silently discard all (slave) connections in case our master forgot us... |
67 | */ |
68 | |
69 | static void ax25_ds_timeout(unsigned long arg) |
70 | { |
71 | ax25_dev *ax25_dev = (struct ax25_dev *) arg; |
72 | ax25_cb *ax25; |
73 | |
74 | if (ax25_dev == NULL || !ax25_dev->dama.slave) |
75 | return; /* Yikes! */ |
76 | |
77 | if (!ax25_dev->dama.slave_timeout || --ax25_dev->dama.slave_timeout) { |
78 | ax25_ds_set_timer(ax25_dev); |
79 | return; |
80 | } |
81 | |
82 | spin_lock(&ax25_list_lock); |
83 | ax25_for_each(ax25, &ax25_list) { |
84 | if (ax25->ax25_dev != ax25_dev || !(ax25->condition & AX25_COND_DAMA_MODE)) |
85 | continue; |
86 | |
87 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); |
88 | ax25_disconnect(ax25, ETIMEDOUT); |
89 | } |
90 | spin_unlock(&ax25_list_lock); |
91 | |
92 | ax25_dev_dama_off(ax25_dev); |
93 | } |
94 | |
95 | void ax25_ds_heartbeat_expiry(ax25_cb *ax25) |
96 | { |
97 | struct sock *sk=ax25->sk; |
98 | |
99 | if (sk) |
100 | bh_lock_sock(sk); |
101 | |
102 | switch (ax25->state) { |
103 | |
104 | case AX25_STATE_0: |
105 | /* Magic here: If we listen() and a new link dies before it |
106 | is accepted() it isn't 'dead' so doesn't get removed. */ |
107 | if (!sk || sock_flag(sk, SOCK_DESTROY) || |
108 | (sk->sk_state == TCP_LISTEN && |
109 | sock_flag(sk, SOCK_DEAD))) { |
110 | if (sk) { |
111 | sock_hold(sk); |
112 | ax25_destroy_socket(ax25); |
113 | bh_unlock_sock(sk); |
114 | sock_put(sk); |
115 | } else |
116 | ax25_destroy_socket(ax25); |
117 | return; |
118 | } |
119 | break; |
120 | |
121 | case AX25_STATE_3: |
122 | /* |
123 | * Check the state of the receive buffer. |
124 | */ |
125 | if (sk != NULL) { |
126 | if (atomic_read(&sk->sk_rmem_alloc) < |
127 | (sk->sk_rcvbuf >> 1) && |
128 | (ax25->condition & AX25_COND_OWN_RX_BUSY)) { |
129 | ax25->condition &= ~AX25_COND_OWN_RX_BUSY; |
130 | ax25->condition &= ~AX25_COND_ACK_PENDING; |
131 | break; |
132 | } |
133 | } |
134 | break; |
135 | } |
136 | |
137 | if (sk) |
138 | bh_unlock_sock(sk); |
139 | |
140 | ax25_start_heartbeat(ax25); |
141 | } |
142 | |
143 | /* dl1bke 960114: T3 works much like the IDLE timeout, but |
144 | * gets reloaded with every frame for this |
145 | * connection. |
146 | */ |
147 | void ax25_ds_t3timer_expiry(ax25_cb *ax25) |
148 | { |
149 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); |
150 | ax25_dama_off(ax25); |
151 | ax25_disconnect(ax25, ETIMEDOUT); |
152 | } |
153 | |
154 | /* dl1bke 960228: close the connection when IDLE expires. |
155 | * unlike T3 this timer gets reloaded only on |
156 | * I frames. |
157 | */ |
158 | void ax25_ds_idletimer_expiry(ax25_cb *ax25) |
159 | { |
160 | ax25_clear_queues(ax25); |
161 | |
162 | ax25->n2count = 0; |
163 | ax25->state = AX25_STATE_2; |
164 | |
165 | ax25_calculate_t1(ax25); |
166 | ax25_start_t1timer(ax25); |
167 | ax25_stop_t3timer(ax25); |
168 | |
169 | if (ax25->sk != NULL) { |
170 | bh_lock_sock(ax25->sk); |
171 | ax25->sk->sk_state = TCP_CLOSE; |
172 | ax25->sk->sk_err = 0; |
173 | ax25->sk->sk_shutdown |= SEND_SHUTDOWN; |
174 | if (!sock_flag(ax25->sk, SOCK_DEAD)) { |
175 | ax25->sk->sk_state_change(ax25->sk); |
176 | sock_set_flag(ax25->sk, SOCK_DEAD); |
177 | } |
178 | bh_unlock_sock(ax25->sk); |
179 | } |
180 | } |
181 | |
182 | /* dl1bke 960114: The DAMA protocol requires to send data and SABM/DISC |
183 | * within the poll of any connected channel. Remember |
184 | * that we are not allowed to send anything unless we |
185 | * get polled by the Master. |
186 | * |
187 | * Thus we'll have to do parts of our T1 handling in |
188 | * ax25_enquiry_response(). |
189 | */ |
190 | void ax25_ds_t1_timeout(ax25_cb *ax25) |
191 | { |
192 | switch (ax25->state) { |
193 | case AX25_STATE_1: |
194 | if (ax25->n2count == ax25->n2) { |
195 | if (ax25->modulus == AX25_MODULUS) { |
196 | ax25_disconnect(ax25, ETIMEDOUT); |
197 | return; |
198 | } else { |
199 | ax25->modulus = AX25_MODULUS; |
200 | ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; |
201 | ax25->n2count = 0; |
202 | ax25_send_control(ax25, AX25_SABM, AX25_POLLOFF, AX25_COMMAND); |
203 | } |
204 | } else { |
205 | ax25->n2count++; |
206 | if (ax25->modulus == AX25_MODULUS) |
207 | ax25_send_control(ax25, AX25_SABM, AX25_POLLOFF, AX25_COMMAND); |
208 | else |
209 | ax25_send_control(ax25, AX25_SABME, AX25_POLLOFF, AX25_COMMAND); |
210 | } |
211 | break; |
212 | |
213 | case AX25_STATE_2: |
214 | if (ax25->n2count == ax25->n2) { |
215 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); |
216 | ax25_disconnect(ax25, ETIMEDOUT); |
217 | return; |
218 | } else { |
219 | ax25->n2count++; |
220 | } |
221 | break; |
222 | |
223 | case AX25_STATE_3: |
224 | if (ax25->n2count == ax25->n2) { |
225 | ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE); |
226 | ax25_disconnect(ax25, ETIMEDOUT); |
227 | return; |
228 | } else { |
229 | ax25->n2count++; |
230 | } |
231 | break; |
232 | } |
233 | |
234 | ax25_calculate_t1(ax25); |
235 | ax25_start_t1timer(ax25); |
236 | } |
237 |
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od-2011-09-04
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v2.6.34-rc5
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