ia64/linux-2.6.18-xen.hg

view net/ax25/ax25_ds_timer.c @ 673:3161879fdf22

[IA64] xencomm: support XENMEM_add_to_physmap and XENMEM_remove_from_phsymap

support XENMEM_add_to_physmap and XENMEM_remove_from_phsymap.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Tue Sep 16 21:26:15 2008 +0900 (2008-09-16)
parents 831230e53067
children
line source
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>
33 static void ax25_ds_timeout(unsigned long);
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 */
43 static void ax25_ds_add_timer(ax25_dev *ax25_dev)
44 {
45 struct timer_list *t = &ax25_dev->dama.slave_timer;
46 t->data = (unsigned long) ax25_dev;
47 t->function = &ax25_ds_timeout;
48 t->expires = jiffies + HZ;
49 add_timer(t);
50 }
52 void ax25_ds_del_timer(ax25_dev *ax25_dev)
53 {
54 if (ax25_dev)
55 del_timer(&ax25_dev->dama.slave_timer);
56 }
58 void ax25_ds_set_timer(ax25_dev *ax25_dev)
59 {
60 if (ax25_dev == NULL) /* paranoia */
61 return;
63 del_timer(&ax25_dev->dama.slave_timer);
64 ax25_dev->dama.slave_timeout =
65 msecs_to_jiffies(ax25_dev->values[AX25_VALUES_DS_TIMEOUT]) / 10;
66 ax25_ds_add_timer(ax25_dev);
67 }
69 /*
70 * DAMA Slave Timeout
71 * Silently discard all (slave) connections in case our master forgot us...
72 */
74 static void ax25_ds_timeout(unsigned long arg)
75 {
76 ax25_dev *ax25_dev = (struct ax25_dev *) arg;
77 ax25_cb *ax25;
78 struct hlist_node *node;
80 if (ax25_dev == NULL || !ax25_dev->dama.slave)
81 return; /* Yikes! */
83 if (!ax25_dev->dama.slave_timeout || --ax25_dev->dama.slave_timeout) {
84 ax25_ds_set_timer(ax25_dev);
85 return;
86 }
88 spin_lock(&ax25_list_lock);
89 ax25_for_each(ax25, node, &ax25_list) {
90 if (ax25->ax25_dev != ax25_dev || !(ax25->condition & AX25_COND_DAMA_MODE))
91 continue;
93 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
94 ax25_disconnect(ax25, ETIMEDOUT);
95 }
96 spin_unlock(&ax25_list_lock);
98 ax25_dev_dama_off(ax25_dev);
99 }
101 void ax25_ds_heartbeat_expiry(ax25_cb *ax25)
102 {
103 struct sock *sk=ax25->sk;
105 if (sk)
106 bh_lock_sock(sk);
108 switch (ax25->state) {
110 case AX25_STATE_0:
111 /* Magic here: If we listen() and a new link dies before it
112 is accepted() it isn't 'dead' so doesn't get removed. */
113 if (!sk || sock_flag(sk, SOCK_DESTROY) ||
114 (sk->sk_state == TCP_LISTEN &&
115 sock_flag(sk, SOCK_DEAD))) {
116 if (sk) {
117 sock_hold(sk);
118 ax25_destroy_socket(ax25);
119 sock_put(sk);
120 bh_unlock_sock(sk);
121 } else
122 ax25_destroy_socket(ax25);
123 return;
124 }
125 break;
127 case AX25_STATE_3:
128 /*
129 * Check the state of the receive buffer.
130 */
131 if (sk != NULL) {
132 if (atomic_read(&sk->sk_rmem_alloc) <
133 (sk->sk_rcvbuf / 2) &&
134 (ax25->condition & AX25_COND_OWN_RX_BUSY)) {
135 ax25->condition &= ~AX25_COND_OWN_RX_BUSY;
136 ax25->condition &= ~AX25_COND_ACK_PENDING;
137 break;
138 }
139 }
140 break;
141 }
143 if (sk)
144 bh_unlock_sock(sk);
146 ax25_start_heartbeat(ax25);
147 }
149 /* dl1bke 960114: T3 works much like the IDLE timeout, but
150 * gets reloaded with every frame for this
151 * connection.
152 */
153 void ax25_ds_t3timer_expiry(ax25_cb *ax25)
154 {
155 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
156 ax25_dama_off(ax25);
157 ax25_disconnect(ax25, ETIMEDOUT);
158 }
160 /* dl1bke 960228: close the connection when IDLE expires.
161 * unlike T3 this timer gets reloaded only on
162 * I frames.
163 */
164 void ax25_ds_idletimer_expiry(ax25_cb *ax25)
165 {
166 ax25_clear_queues(ax25);
168 ax25->n2count = 0;
169 ax25->state = AX25_STATE_2;
171 ax25_calculate_t1(ax25);
172 ax25_start_t1timer(ax25);
173 ax25_stop_t3timer(ax25);
175 if (ax25->sk != NULL) {
176 bh_lock_sock(ax25->sk);
177 ax25->sk->sk_state = TCP_CLOSE;
178 ax25->sk->sk_err = 0;
179 ax25->sk->sk_shutdown |= SEND_SHUTDOWN;
180 if (!sock_flag(ax25->sk, SOCK_DEAD)) {
181 ax25->sk->sk_state_change(ax25->sk);
182 sock_set_flag(ax25->sk, SOCK_DEAD);
183 }
184 bh_unlock_sock(ax25->sk);
185 }
186 }
188 /* dl1bke 960114: The DAMA protocol requires to send data and SABM/DISC
189 * within the poll of any connected channel. Remember
190 * that we are not allowed to send anything unless we
191 * get polled by the Master.
192 *
193 * Thus we'll have to do parts of our T1 handling in
194 * ax25_enquiry_response().
195 */
196 void ax25_ds_t1_timeout(ax25_cb *ax25)
197 {
198 switch (ax25->state) {
199 case AX25_STATE_1:
200 if (ax25->n2count == ax25->n2) {
201 if (ax25->modulus == AX25_MODULUS) {
202 ax25_disconnect(ax25, ETIMEDOUT);
203 return;
204 } else {
205 ax25->modulus = AX25_MODULUS;
206 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
207 ax25->n2count = 0;
208 ax25_send_control(ax25, AX25_SABM, AX25_POLLOFF, AX25_COMMAND);
209 }
210 } else {
211 ax25->n2count++;
212 if (ax25->modulus == AX25_MODULUS)
213 ax25_send_control(ax25, AX25_SABM, AX25_POLLOFF, AX25_COMMAND);
214 else
215 ax25_send_control(ax25, AX25_SABME, AX25_POLLOFF, AX25_COMMAND);
216 }
217 break;
219 case AX25_STATE_2:
220 if (ax25->n2count == ax25->n2) {
221 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
222 ax25_disconnect(ax25, ETIMEDOUT);
223 return;
224 } else {
225 ax25->n2count++;
226 }
227 break;
229 case AX25_STATE_3:
230 if (ax25->n2count == ax25->n2) {
231 ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
232 ax25_disconnect(ax25, ETIMEDOUT);
233 return;
234 } else {
235 ax25->n2count++;
236 }
237 break;
238 }
240 ax25_calculate_t1(ax25);
241 ax25_start_t1timer(ax25);
242 }