1 files changed, 189 insertions, 0 deletions

diff --git a/net/lapb/lapb_timer.c b/net/lapb/lapb_timer.c
new file mode 100644
index 000000000000..2c8f0f809220
--- /dev/null
+++ b/net/lapb/lapb_timer.c
@@ -0,0 +1,189 @@
+/*
+ *      LAPB release 002
+ *
+ *      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
+ *      LAPB 001        Jonathan Naylor Started Coding
+ *      LAPB 002        Jonathan Naylor New timer architecture.
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.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 <linux/inet.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>
+#include <net/lapb.h>
+
+static void lapb_t1timer_expiry(unsigned long);
+static void lapb_t2timer_expiry(unsigned long);
+
+void lapb_start_t1timer(struct lapb_cb *lapb)
+{
+        del_timer(&lapb->t1timer);
+
+        lapb->t1timer.data     = (unsigned long)lapb;
+        lapb->t1timer.function = &lapb_t1timer_expiry;
+        lapb->t1timer.expires  = jiffies + lapb->t1;
+
+        add_timer(&lapb->t1timer);
+}
+
+void lapb_start_t2timer(struct lapb_cb *lapb)
+{
+        del_timer(&lapb->t2timer);
+
+        lapb->t2timer.data     = (unsigned long)lapb;
+        lapb->t2timer.function = &lapb_t2timer_expiry;
+        lapb->t2timer.expires  = jiffies + lapb->t2;
+
+        add_timer(&lapb->t2timer);
+}
+
+void lapb_stop_t1timer(struct lapb_cb *lapb)
+{
+        del_timer(&lapb->t1timer);
+}
+
+void lapb_stop_t2timer(struct lapb_cb *lapb)
+{
+        del_timer(&lapb->t2timer);
+}
+
+int lapb_t1timer_running(struct lapb_cb *lapb)
+{
+        return timer_pending(&lapb->t1timer);
+}
+
+static void lapb_t2timer_expiry(unsigned long param)
+{
+        struct lapb_cb *lapb = (struct lapb_cb *)param;
+
+        if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
+                lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
+                lapb_timeout_response(lapb);
+        }
+}
+
+static void lapb_t1timer_expiry(unsigned long param)
+{
+        struct lapb_cb *lapb = (struct lapb_cb *)param;
+
+        switch (lapb->state) {
+
+                /*
+                 *      If we are a DCE, keep going DM .. DM .. DM
+                 */
+                case LAPB_STATE_0:
+                        if (lapb->mode & LAPB_DCE)
+                                lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE);
+                        break;
+
+                /*
+                 *      Awaiting connection state, send SABM(E), up to N2 times.
+                 */
+                case LAPB_STATE_1: 
+                        if (lapb->n2count == lapb->n2) {
+                                lapb_clear_queues(lapb);
+                                lapb->state = LAPB_STATE_0;
+                                lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+                                printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->dev);
+#endif
+                                return;
+                        } else {
+                                lapb->n2count++;
+                                if (lapb->mode & LAPB_EXTENDED) {
+#if LAPB_DEBUG > 1
+                                        printk(KERN_DEBUG "lapb: (%p) S1 TX SABME(1)\n", lapb->dev);
+#endif
+                                        lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
+                                } else {
+#if LAPB_DEBUG > 1
+                                        printk(KERN_DEBUG "lapb: (%p) S1 TX SABM(1)\n", lapb->dev);
+#endif
+                                        lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
+                                }
+                        }
+                        break;
+
+                /*
+                 *      Awaiting disconnection state, send DISC, up to N2 times.
+                 */
+                case LAPB_STATE_2:
+                        if (lapb->n2count == lapb->n2) {
+                                lapb_clear_queues(lapb);
+                                lapb->state = LAPB_STATE_0;
+                                lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+                                printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->dev);
+#endif
+                                return;
+                        } else {
+                                lapb->n2count++;
+#if LAPB_DEBUG > 1
+                                printk(KERN_DEBUG "lapb: (%p) S2 TX DISC(1)\n", lapb->dev);
+#endif
+                                lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
+                        }
+                        break;
+
+                /*
+                 *      Data transfer state, restransmit I frames, up to N2 times.
+                 */
+                case LAPB_STATE_3:
+                        if (lapb->n2count == lapb->n2) {
+                                lapb_clear_queues(lapb);
+                                lapb->state = LAPB_STATE_0;
+                                lapb_stop_t2timer(lapb);
+                                lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+                                printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->dev);
+#endif
+                                return;
+                        } else {
+                                lapb->n2count++;
+                                lapb_requeue_frames(lapb);
+                        }
+                        break;
+
+                /*
+                 *      Frame reject state, restransmit FRMR frames, up to N2 times.
+                 */
+                case LAPB_STATE_4:
+                        if (lapb->n2count == lapb->n2) {
+                                lapb_clear_queues(lapb);
+                                lapb->state = LAPB_STATE_0;
+                                lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+                                printk(KERN_DEBUG "lapb: (%p) S4 -> S0\n", lapb->dev);
+#endif
+                                return;
+                        } else {
+                                lapb->n2count++;
+                                lapb_transmit_frmr(lapb);
+                        }
+                        break;
+        }
+
+        lapb_start_t1timer(lapb);
+}