patch-2.1.20 linux/net/lapb/lapb_timer.c

• Lines: 184
• Date: Thu Jan 2 15:13:29 1997
• Orig file: v2.1.19/linux/net/lapb/lapb_timer.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.19/linux/net/lapb/lapb_timer.c linux/net/lapb/lapb_timer.c
@@ -0,0 +1,183 @@
+/*
+ *	LAPB release 001
+ *
+ *	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
+ *	LAPB 001	Jonathan Naylor	Started Coding
+ */
+
+#include <linux/config.h>
+#if defined(CONFIG_LAPB) || defined(CONFIG_LAPB_MODULE)
+#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 <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_timer(unsigned long);
+
+/*
+ *	Linux set/reset timer routines
+ */
+void lapb_set_timer(lapb_cb *lapb)
+{
+	unsigned long flags;	
+
+	save_flags(flags);
+	cli();
+	del_timer(&lapb->timer);
+	restore_flags(flags);
+
+	lapb->timer.next     = lapb->timer.prev = NULL;	
+	lapb->timer.data     = (unsigned long)lapb;
+	lapb->timer.function = &lapb_timer;
+
+	lapb->timer.expires = jiffies + 10;
+	add_timer(&lapb->timer);
+}
+
+static void lapb_reset_timer(lapb_cb *lapb)
+{
+	unsigned long flags;
+	
+	save_flags(flags);
+	cli();
+	del_timer(&lapb->timer);
+	restore_flags(flags);
+
+	lapb->timer.data     = (unsigned long)lapb;
+	lapb->timer.function = &lapb_timer;
+	lapb->timer.expires  = jiffies + 10;
+	add_timer(&lapb->timer);
+}
+
+/*
+ *	LAPB TIMER 
+ *
+ *	This routine is called every 100ms. Decrement timer by this
+ *	amount - if expired then process the event.
+ */
+static void lapb_timer(unsigned long param)
+{
+	lapb_cb *lapb = (lapb_cb *)param;
+
+	if (lapb->state == LAPB_STATE_3 || lapb->state == LAPB_STATE_4)
+		lapb_kick(lapb);
+
+	if (lapb->t2timer > 0 && --lapb->t2timer == 0) {
+		if (lapb->state == LAPB_STATE_3 || lapb->state == LAPB_STATE_4) {
+			if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
+				lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
+				lapb_timeout_response(lapb);
+			}
+		}
+	}
+
+	if (lapb->t1timer == 0 || --lapb->t1timer > 0) {
+		lapb_reset_timer(lapb);
+		return;
+	}
+
+	switch (lapb->state) {
+		case LAPB_STATE_0:
+			if (lapb->mode & LAPB_DCE)
+				lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE);
+			break;
+		case LAPB_STATE_1: 
+			if (lapb->n2count == lapb->n2) {
+				lapb_clear_queues(lapb);
+				lapb->state   = LAPB_STATE_0;
+				lapb->t1timer = (lapb->mode & LAPB_DCE) ? lapb->t1 : 0;
+				lapb->t2timer = 0;
+				lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+				printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->token);
+#endif
+			} else {
+				lapb->n2count++;
+				if (lapb->mode & LAPB_EXTENDED) {
+#if LAPB_DEBUG > 1
+					printk(KERN_DEBUG "lapb: (%p) S1 TX SABME(1)\n", lapb->token);
+#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->token);
+#endif
+					lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
+				}
+			}
+			break;
+
+		case LAPB_STATE_2:
+			if (lapb->n2count == lapb->n2) {
+				lapb_clear_queues(lapb);
+				lapb->state   = LAPB_STATE_0;
+				lapb->t1timer = (lapb->mode & LAPB_DCE) ? lapb->t1 : 0;
+				lapb->t2timer = 0;
+				lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+				printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->token);
+#endif
+			} else {
+				lapb->n2count++;
+#if LAPB_DEBUG > 1
+				printk(KERN_DEBUG "lapb: (%p) S2 TX DISC(1)\n", lapb->token);
+#endif
+				lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
+			}
+			break;
+
+		case LAPB_STATE_3: 
+			lapb->n2count = 1;
+			lapb_transmit_enquiry(lapb);
+			lapb->state   = LAPB_STATE_4;
+			break;
+
+		case LAPB_STATE_4:
+			if (lapb->n2count == lapb->n2) {
+				lapb_clear_queues(lapb);
+				lapb->state   = LAPB_STATE_0;
+				lapb->t1timer = (lapb->mode & LAPB_DCE) ? lapb->t1 : 0;
+				lapb->t2timer = 0;
+				lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+				printk(KERN_DEBUG "lapb: (%p) S4 -> S0\n", lapb->token);
+#endif
+			} else {
+				lapb->n2count++;
+				lapb_transmit_enquiry(lapb);
+			}
+			break;
+	}
+
+	lapb->t1timer = lapb->t1;
+
+	lapb_set_timer(lapb);
+}
+
+#endif