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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 <asm/system.h> |
29 | #include <linux/fcntl.h> |
30 | #include <linux/mm.h> |
31 | #include <linux/interrupt.h> |
32 | |
33 | static void ax25_ds_timeout(unsigned long); |
34 | |
35 | /* |
36 | * Add DAMA slave timeout timer to timer list. |
37 | * Unlike the connection based timers the timeout function gets |
38 | * triggered every second. Please note that NET_AX25_DAMA_SLAVE_TIMEOUT |
39 | * (aka /proc/sys/net/ax25/{dev}/dama_slave_timeout) is still in |
40 | * 1/10th of a second. |
41 | */ |
42 | |
43 | void ax25_ds_setup_timer(ax25_dev *ax25_dev) |
44 | { |
45 | setup_timer(&ax25_dev->dama.slave_timer, ax25_ds_timeout, |
46 | (unsigned long)ax25_dev); |
47 | } |
48 | |
49 | void ax25_ds_del_timer(ax25_dev *ax25_dev) |
50 | { |
51 | if (ax25_dev) |
52 | del_timer(&ax25_dev->dama.slave_timer); |
53 | } |
54 | |
55 | void ax25_ds_set_timer(ax25_dev *ax25_dev) |
56 | { |
57 | if (ax25_dev == NULL) /* paranoia */ |
58 | return; |
59 | |
60 | ax25_dev->dama.slave_timeout = |
61 | msecs_to_jiffies(ax25_dev->values[AX25_VALUES_DS_TIMEOUT]) / 10; |
62 | mod_timer(&ax25_dev->dama.slave_timer, jiffies + HZ); |
63 | } |
64 | |
65 | /* |
66 | * DAMA Slave Timeout |
67 | * Silently discard all (slave) connections in case our master forgot us... |
68 | */ |
69 | |
70 | static void ax25_ds_timeout(unsigned long arg) |
71 | { |
72 | ax25_dev *ax25_dev = (struct ax25_dev *) arg; |
73 | ax25_cb *ax25; |
74 | struct hlist_node *node; |
75 | |
76 | if (ax25_dev == NULL || !ax25_dev->dama.slave) |
77 | return; /* Yikes! */ |
78 | |
79 | if (!ax25_dev->dama.slave_timeout || --ax25_dev->dama.slave_timeout) { |
80 | ax25_ds_set_timer(ax25_dev); |
81 | return; |
82 | } |
83 | |
84 | spin_lock(&ax25_list_lock); |
85 | ax25_for_each(ax25, node, &ax25_list) { |
86 | if (ax25->ax25_dev != ax25_dev || !(ax25->condition & AX25_COND_DAMA_MODE)) |
87 | continue; |
88 | |
89 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); |
90 | ax25_disconnect(ax25, ETIMEDOUT); |
91 | } |
92 | spin_unlock(&ax25_list_lock); |
93 | |
94 | ax25_dev_dama_off(ax25_dev); |
95 | } |
96 | |
97 | void ax25_ds_heartbeat_expiry(ax25_cb *ax25) |
98 | { |
99 | struct sock *sk=ax25->sk; |
100 | |
101 | if (sk) |
102 | bh_lock_sock(sk); |
103 | |
104 | switch (ax25->state) { |
105 | |
106 | case AX25_STATE_0: |
107 | /* Magic here: If we listen() and a new link dies before it |
108 | is accepted() it isn't 'dead' so doesn't get removed. */ |
109 | if (!sk || sock_flag(sk, SOCK_DESTROY) || |
110 | (sk->sk_state == TCP_LISTEN && |
111 | sock_flag(sk, SOCK_DEAD))) { |
112 | if (sk) { |
113 | sock_hold(sk); |
114 | ax25_destroy_socket(ax25); |
115 | sock_put(sk); |
116 | bh_unlock_sock(sk); |
117 | } else |
118 | ax25_destroy_socket(ax25); |
119 | return; |
120 | } |
121 | break; |
122 | |
123 | case AX25_STATE_3: |
124 | /* |
125 | * Check the state of the receive buffer. |
126 | */ |
127 | if (sk != NULL) { |
128 | if (atomic_read(&sk->sk_rmem_alloc) < |
129 | (sk->sk_rcvbuf >> 1) && |
130 | (ax25->condition & AX25_COND_OWN_RX_BUSY)) { |
131 | ax25->condition &= ~AX25_COND_OWN_RX_BUSY; |
132 | ax25->condition &= ~AX25_COND_ACK_PENDING; |
133 | break; |
134 | } |
135 | } |
136 | break; |
137 | } |
138 | |
139 | if (sk) |
140 | bh_unlock_sock(sk); |
141 | |
142 | ax25_start_heartbeat(ax25); |
143 | } |
144 | |
145 | /* dl1bke 960114: T3 works much like the IDLE timeout, but |
146 | * gets reloaded with every frame for this |
147 | * connection. |
148 | */ |
149 | void ax25_ds_t3timer_expiry(ax25_cb *ax25) |
150 | { |
151 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); |
152 | ax25_dama_off(ax25); |
153 | ax25_disconnect(ax25, ETIMEDOUT); |
154 | } |
155 | |
156 | /* dl1bke 960228: close the connection when IDLE expires. |
157 | * unlike T3 this timer gets reloaded only on |
158 | * I frames. |
159 | */ |
160 | void ax25_ds_idletimer_expiry(ax25_cb *ax25) |
161 | { |
162 | ax25_clear_queues(ax25); |
163 | |
164 | ax25->n2count = 0; |
165 | ax25->state = AX25_STATE_2; |
166 | |
167 | ax25_calculate_t1(ax25); |
168 | ax25_start_t1timer(ax25); |
169 | ax25_stop_t3timer(ax25); |
170 | |
171 | if (ax25->sk != NULL) { |
172 | bh_lock_sock(ax25->sk); |
173 | ax25->sk->sk_state = TCP_CLOSE; |
174 | ax25->sk->sk_err = 0; |
175 | ax25->sk->sk_shutdown |= SEND_SHUTDOWN; |
176 | if (!sock_flag(ax25->sk, SOCK_DEAD)) { |
177 | ax25->sk->sk_state_change(ax25->sk); |
178 | sock_set_flag(ax25->sk, SOCK_DEAD); |
179 | } |
180 | bh_unlock_sock(ax25->sk); |
181 | } |
182 | } |
183 | |
184 | /* dl1bke 960114: The DAMA protocol requires to send data and SABM/DISC |
185 | * within the poll of any connected channel. Remember |
186 | * that we are not allowed to send anything unless we |
187 | * get polled by the Master. |
188 | * |
189 | * Thus we'll have to do parts of our T1 handling in |
190 | * ax25_enquiry_response(). |
191 | */ |
192 | void ax25_ds_t1_timeout(ax25_cb *ax25) |
193 | { |
194 | switch (ax25->state) { |
195 | case AX25_STATE_1: |
196 | if (ax25->n2count == ax25->n2) { |
197 | if (ax25->modulus == AX25_MODULUS) { |
198 | ax25_disconnect(ax25, ETIMEDOUT); |
199 | return; |
200 | } else { |
201 | ax25->modulus = AX25_MODULUS; |
202 | ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; |
203 | ax25->n2count = 0; |
204 | ax25_send_control(ax25, AX25_SABM, AX25_POLLOFF, AX25_COMMAND); |
205 | } |
206 | } else { |
207 | ax25->n2count++; |
208 | if (ax25->modulus == AX25_MODULUS) |
209 | ax25_send_control(ax25, AX25_SABM, AX25_POLLOFF, AX25_COMMAND); |
210 | else |
211 | ax25_send_control(ax25, AX25_SABME, AX25_POLLOFF, AX25_COMMAND); |
212 | } |
213 | break; |
214 | |
215 | case AX25_STATE_2: |
216 | if (ax25->n2count == ax25->n2) { |
217 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); |
218 | ax25_disconnect(ax25, ETIMEDOUT); |
219 | return; |
220 | } else { |
221 | ax25->n2count++; |
222 | } |
223 | break; |
224 | |
225 | case AX25_STATE_3: |
226 | if (ax25->n2count == ax25->n2) { |
227 | ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE); |
228 | ax25_disconnect(ax25, ETIMEDOUT); |
229 | return; |
230 | } else { |
231 | ax25->n2count++; |
232 | } |
233 | break; |
234 | } |
235 | |
236 | ax25_calculate_t1(ax25); |
237 | ax25_start_t1timer(ax25); |
238 | } |
239 |
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Tags:
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v2.6.34-rc5
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