Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 241 insertions, 0 deletions

diff --git a/net/ax25/ax25_ds_timer.c b/net/ax25/ax25_ds_timer.c
new file mode 100644
index 000000000000..3a8b67316fc3
--- /dev/null
+++ b/net/ax25/ax25_ds_timer.c
@@ -0,0 +1,241 @@
+/*
+ * This program 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.
+ *
+ * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
+ * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
+ */
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/spinlock.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/jiffies.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <net/tcp.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;
+        struct hlist_node *node;
+
+        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;
+        }
+
+        spin_lock_bh(&ax25_list_lock);
+        ax25_for_each(ax25, node, &ax25_list) {
+                if (ax25->ax25_dev != ax25_dev || !(ax25->condition & AX25_COND_DAMA_MODE))
+                        continue;
+
+                ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+                ax25_disconnect(ax25, ETIMEDOUT);
+        }
+        spin_unlock_bh(&ax25_list_lock);
+
+        ax25_dev_dama_off(ax25_dev);
+}
+
+void ax25_ds_heartbeat_expiry(ax25_cb *ax25)
+{
+        struct sock *sk=ax25->sk;
+
+        if (sk)
+                bh_lock_sock(sk);
+
+        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 (!sk || sock_flag(sk, SOCK_DESTROY) ||
+                    (sk->sk_state == TCP_LISTEN &&
+                     sock_flag(sk, SOCK_DEAD))) {
+                        if (sk) {
+                                sock_hold(sk);
+                                ax25_destroy_socket(ax25);
+                                sock_put(sk);
+                                bh_unlock_sock(sk);
+                        } else
+                                ax25_destroy_socket(ax25);
+                        return;
+                }
+                break;
+
+        case AX25_STATE_3:
+                /*
+                 * Check the state of the receive buffer.
+                 */
+                if (sk != NULL) {
+                        if (atomic_read(&sk->sk_rmem_alloc) <
+                            (sk->sk_rcvbuf / 2) &&
+                            (ax25->condition & AX25_COND_OWN_RX_BUSY)) {
+                                ax25->condition &= ~AX25_COND_OWN_RX_BUSY;
+                                ax25->condition &= ~AX25_COND_ACK_PENDING;
+                                break;
+                        }
+                }
+                break;
+        }
+
+        if (sk)
+                bh_unlock_sock(sk);
+
+        ax25_start_heartbeat(ax25);
+}
+
+/* dl1bke 960114: T3 works much like the IDLE timeout, but
+ *                gets reloaded with every frame for this
+ *                connection.
+ */
+void ax25_ds_t3timer_expiry(ax25_cb *ax25)
+{
+        ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+        ax25_dama_off(ax25);
+        ax25_disconnect(ax25, ETIMEDOUT);
+}
+
+/* dl1bke 960228: close the connection when IDLE expires.
+ *                unlike T3 this timer gets reloaded only on
+ *                I frames.
+ */
+void ax25_ds_idletimer_expiry(ax25_cb *ax25)
+{
+        ax25_clear_queues(ax25);
+
+        ax25->n2count = 0;
+        ax25->state = AX25_STATE_2;
+
+        ax25_calculate_t1(ax25);
+        ax25_start_t1timer(ax25);
+        ax25_stop_t3timer(ax25);
+
+        if (ax25->sk != NULL) {
+                bh_lock_sock(ax25->sk);
+                ax25->sk->sk_state     = TCP_CLOSE;
+                ax25->sk->sk_err       = 0;
+                ax25->sk->sk_shutdown |= SEND_SHUTDOWN;
+                if (!sock_flag(ax25->sk, SOCK_DEAD)) {
+                        ax25->sk->sk_state_change(ax25->sk);
+                        sock_set_flag(ax25->sk, SOCK_DEAD);
+                }
+                bh_unlock_sock(ax25->sk);
+        }
+}
+
+/* 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_disconnect(ax25, ETIMEDOUT);
+                                return;
+                        } 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_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+                        ax25_disconnect(ax25, ETIMEDOUT);
+                        return;
+                } else {
+                        ax25->n2count++;
+                }
+                break;
+
+        case AX25_STATE_3:
+                if (ax25->n2count == ax25->n2) {
+                        ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
+                        ax25_disconnect(ax25, ETIMEDOUT);
+                        return;
+                } else {
+                        ax25->n2count++;
+                }
+                break;
+        }
+
+        ax25_calculate_t1(ax25);
+        ax25_start_t1timer(ax25);
+}