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-rw-r--r--net/ax25/ax25_ds_timer.c313
1 files changed, 313 insertions, 0 deletions
diff --git a/net/ax25/ax25_ds_timer.c b/net/ax25/ax25_ds_timer.c
new file mode 100644
index 000000000..1b9d3c95f
--- /dev/null
+++ b/net/ax25/ax25_ds_timer.c
@@ -0,0 +1,313 @@
+/*
+ * AX.25 release 036
+ *
+ * This is ALPHA test software. This code may break your machine, randomly fail to work with new
+ * releases, misbehave and/or generally screw up. It might even work.
+ *
+ * This code REQUIRES 2.1.15 or higher/ NET3.038
+ *
+ * This module:
+ * This module is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * History
+ * AX.25 036 Jonathan(G4KLX) Cloned from ax25_timer.c.
+ * Joerg(DL1BKE) Added DAMA Slave Timeout timer
+ */
+
+#include <linux/config.h>
+#if defined(CONFIG_AX25_DAMA_SLAVE)
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <net/ax25.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+
+static void ax25_ds_timeout(unsigned long);
+
+/*
+ * Add DAMA slave timeout timer to timer list.
+ * Unlike the connection based timers the timeout function gets
+ * triggered every second. Please note that NET_AX25_DAMA_SLAVE_TIMEOUT
+ * (aka /proc/sys/net/ax25/{dev}/dama_slave_timeout) is still in
+ * 1/10th of a second.
+ */
+
+static void ax25_ds_add_timer(ax25_dev *ax25_dev)
+{
+ struct timer_list *t = &ax25_dev->dama.slave_timer;
+ t->data = (unsigned long) ax25_dev;
+ t->function = &ax25_ds_timeout;
+ t->expires = jiffies + HZ;
+ add_timer(t);
+}
+
+void ax25_ds_del_timer(ax25_dev *ax25_dev)
+{
+ if (ax25_dev) del_timer(&ax25_dev->dama.slave_timer);
+}
+
+void ax25_ds_set_timer(ax25_dev *ax25_dev)
+{
+ if (ax25_dev == NULL) /* paranoia */
+ return;
+
+ del_timer(&ax25_dev->dama.slave_timer);
+ ax25_dev->dama.slave_timeout = ax25_dev->values[AX25_VALUES_DS_TIMEOUT] / 10;
+ ax25_ds_add_timer(ax25_dev);
+}
+
+/*
+ * DAMA Slave Timeout
+ * Silently discard all (slave) connections in case our master forgot us...
+ */
+
+static void ax25_ds_timeout(unsigned long arg)
+{
+ ax25_dev *ax25_dev = (struct ax25_dev *) arg;
+ ax25_cb *ax25;
+
+ if (ax25_dev == NULL || !ax25_dev->dama.slave)
+ return; /* Yikes! */
+
+ if (!ax25_dev->dama.slave_timeout || --ax25_dev->dama.slave_timeout)
+ {
+ ax25_ds_set_timer(ax25_dev);
+ return;
+ }
+
+ for (ax25=ax25_list; ax25 != NULL; ax25 = ax25->next)
+ {
+ if (ax25->ax25_dev != ax25_dev || !ax25->dama_slave)
+ continue;
+
+ ax25_link_failed(&ax25->dest_addr, ax25_dev->dev);
+ ax25_clear_queues(ax25);
+ ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+ ax25->state = AX25_STATE_0;
+
+ if (ax25->sk != NULL)
+ {
+ SOCK_DEBUG(ax25->sk, "AX.25 DAMA Slave Timeout\n");
+ ax25->sk->state = TCP_CLOSE;
+ ax25->sk->err = ETIMEDOUT;
+ ax25->sk->shutdown |= SEND_SHUTDOWN;
+ if (!ax25->sk->dead)
+ ax25->sk->state_change(ax25->sk);
+ ax25->sk->dead = 1;
+ }
+
+ ax25_set_timer(ax25); /* notify socket... */
+ }
+
+ ax25_dev_dama_off(ax25_dev);
+}
+
+
+/*
+ * AX.25 TIMER
+ *
+ * This routine is called every 100ms. Decrement timer by this
+ * amount - if expired then process the event.
+ */
+void ax25_ds_timer(ax25_cb *ax25)
+{
+ switch (ax25->state) {
+ case AX25_STATE_0:
+ /* Magic here: If we listen() and a new link dies before it
+ is accepted() it isn't 'dead' so doesn't get removed. */
+ if (ax25->sk == NULL || ax25->sk->destroy || (ax25->sk->state == TCP_LISTEN && ax25->sk->dead)) {
+ del_timer(&ax25->timer);
+ ax25_destroy_socket(ax25);
+ return;
+ }
+ break;
+
+ case AX25_STATE_3:
+ case AX25_STATE_4:
+ /*
+ * Check the state of the receive buffer.
+ */
+ if (ax25->sk != NULL) {
+ if (atomic_read(&ax25->sk->rmem_alloc) < (ax25->sk->rcvbuf / 2) && (ax25->condition & AX25_COND_OWN_RX_BUSY)) {
+ ax25->condition &= ~AX25_COND_OWN_RX_BUSY;
+ break;
+ }
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ /* dl1bke 960114: T3 works much like the IDLE timeout, but
+ * gets reloaded with every frame for this
+ * connection.
+ */
+
+ if (ax25->t3timer > 0 && --ax25->t3timer == 0) {
+ ax25_link_failed(&ax25->dest_addr, ax25->ax25_dev->dev);
+ ax25_clear_queues(ax25);
+ ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+
+ ax25->state = AX25_STATE_0;
+ ax25_dama_off(ax25);
+
+ if (ax25->sk != NULL) {
+ SOCK_DEBUG(ax25->sk, "AX.25 T3 Timeout\n");
+ ax25->sk->state = TCP_CLOSE;
+ ax25->sk->err = ETIMEDOUT;
+ ax25->sk->shutdown |= SEND_SHUTDOWN;
+ if (!ax25->sk->dead)
+ ax25->sk->state_change(ax25->sk);
+ ax25->sk->dead = 1;
+ }
+
+ ax25_set_timer(ax25);
+
+ return;
+ }
+
+ /* dl1bke 960228: close the connection when IDLE expires.
+ * unlike T3 this timer gets reloaded only on
+ * I frames.
+ */
+
+ if (ax25->idletimer > 0 && --ax25->idletimer == 0) {
+ ax25_clear_queues(ax25);
+
+ ax25->n2count = 0;
+ ax25->t3timer = ax25->t3;
+
+ /* state 1 or 2 should not happen, but... */
+
+ if (ax25->state == AX25_STATE_1 || ax25->state == AX25_STATE_2)
+ ax25->state = AX25_STATE_0;
+ else
+ ax25->state = AX25_STATE_2;
+
+ ax25->t1timer = ax25->t1 = ax25_calculate_t1(ax25);
+
+ if (ax25->sk != NULL) {
+ ax25->sk->state = TCP_CLOSE;
+ ax25->sk->err = 0;
+ ax25->sk->shutdown |= SEND_SHUTDOWN;
+ if (!ax25->sk->dead)
+ ax25->sk->state_change(ax25->sk);
+ ax25->sk->dead = 1;
+ ax25->sk->destroy = 1;
+ }
+ }
+
+ ax25_set_timer(ax25);
+}
+
+/* dl1bke 960114: The DAMA protocol requires to send data and SABM/DISC
+ * within the poll of any connected channel. Remember
+ * that we are not allowed to send anything unless we
+ * get polled by the Master.
+ *
+ * Thus we'll have to do parts of our T1 handling in
+ * ax25_enquiry_response().
+ */
+void ax25_ds_t1_timeout(ax25_cb *ax25)
+{
+ switch (ax25->state) {
+ case AX25_STATE_1:
+ if (ax25->n2count == ax25->n2) {
+ if (ax25->modulus == AX25_MODULUS) {
+ ax25_link_failed(&ax25->dest_addr, ax25->ax25_dev->dev);
+ ax25_clear_queues(ax25);
+ ax25->state = AX25_STATE_0;
+ if (ax25->sk != NULL) {
+ ax25->sk->state = TCP_CLOSE;
+ ax25->sk->err = ETIMEDOUT;
+ ax25->sk->shutdown |= SEND_SHUTDOWN;
+ if (!ax25->sk->dead)
+ ax25->sk->state_change(ax25->sk);
+ ax25->sk->dead = 1;
+ }
+ } else {
+ ax25->modulus = AX25_MODULUS;
+ ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
+ ax25->n2count = 0;
+ ax25_send_control(ax25, AX25_SABM, AX25_POLLOFF, AX25_COMMAND);
+ }
+ } else {
+ ax25->n2count++;
+ if (ax25->modulus == AX25_MODULUS)
+ ax25_send_control(ax25, AX25_SABM, AX25_POLLOFF, AX25_COMMAND);
+ else
+ ax25_send_control(ax25, AX25_SABME, AX25_POLLOFF, AX25_COMMAND);
+ }
+ break;
+
+ case AX25_STATE_2:
+ if (ax25->n2count == ax25->n2) {
+ ax25_link_failed(&ax25->dest_addr, ax25->ax25_dev->dev);
+ ax25_clear_queues(ax25);
+ ax25->state = AX25_STATE_0;
+ ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+
+ if (ax25->sk != NULL) {
+ ax25->sk->state = TCP_CLOSE;
+ ax25->sk->err = ETIMEDOUT;
+ ax25->sk->shutdown |= SEND_SHUTDOWN;
+ if (!ax25->sk->dead)
+ ax25->sk->state_change(ax25->sk);
+ ax25->sk->dead = 1;
+ }
+ } else {
+ ax25->n2count++;
+ }
+ break;
+
+ case AX25_STATE_3:
+ ax25->n2count = 1;
+ ax25->state = AX25_STATE_4;
+ break;
+
+ case AX25_STATE_4:
+ if (ax25->n2count == ax25->n2) {
+ ax25_link_failed(&ax25->dest_addr, ax25->ax25_dev->dev);
+ ax25_clear_queues(ax25);
+ ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
+ ax25->state = AX25_STATE_0;
+ if (ax25->sk != NULL) {
+ SOCK_DEBUG(ax25->sk, "AX.25 link Failure\n");
+ ax25->sk->state = TCP_CLOSE;
+ ax25->sk->err = ETIMEDOUT;
+ ax25->sk->shutdown |= SEND_SHUTDOWN;
+ if (!ax25->sk->dead)
+ ax25->sk->state_change(ax25->sk);
+ ax25->sk->dead = 1;
+ }
+ } else {
+ ax25->n2count++;
+ }
+ break;
+ }
+
+ ax25->t1timer = ax25->t1 = ax25_calculate_t1(ax25);
+
+ ax25_set_timer(ax25);
+}
+
+#endif
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