patch-2.1.16 linux/net/x25/x25_timer.c

• Lines: 168
• Date: Wed Dec 18 12:07:56 1996
• Orig file: v2.1.15/linux/net/x25/x25_timer.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.15/linux/net/x25/x25_timer.c linux/net/x25/x25_timer.c
@@ -0,0 +1,166 @@
+/*
+ *	X.25 Packet Layer 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
+ *
+ *	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
+ *	X.25 001	Jonathan Naylor	Started coding.
+ */
+
+#include <linux/config.h>
+#if defined(CONFIG_X25) || defined(CONFIG_X25_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/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <asm/segment.h>
+#include <asm/system.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <net/x25.h>
+
+static void x25_timer(unsigned long);
+
+/*
+ *	Linux set/reset timer routines
+ */
+void x25_set_timer(struct sock *sk)
+{
+	unsigned long flags;
+	
+	save_flags(flags);
+	cli();
+
+	del_timer(&sk->timer);
+
+	restore_flags(flags);
+
+	sk->timer.next     = sk->timer.prev = NULL;	
+	sk->timer.data     = (unsigned long)sk;
+	sk->timer.function = &x25_timer;
+	sk->timer.expires  = jiffies + 100;
+
+	add_timer(&sk->timer);
+}
+
+static void x25_reset_timer(struct sock *sk)
+{
+	unsigned long flags;
+	
+	save_flags(flags);
+	cli();
+
+	del_timer(&sk->timer);
+
+	restore_flags(flags);
+
+	sk->timer.data     = (unsigned long)sk;
+	sk->timer.function = &x25_timer;
+	sk->timer.expires  = jiffies + 100;
+
+	add_timer(&sk->timer);
+}
+
+/*
+ *	X.25 TIMER 
+ *
+ *	This routine is called every second. Decrement timer by this
+ *	amount - if expired then process the event.
+ */
+static void x25_timer(unsigned long param)
+{
+	struct sock *sk = (struct sock *)param;
+
+	switch (sk->protinfo.x25->state) {
+		case X25_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->destroy || (sk->state == TCP_LISTEN && sk->dead)) {
+				del_timer(&sk->timer);
+				x25_destroy_socket(sk);
+				return;
+			}
+			break;
+
+		case X25_STATE_3:
+			/*
+			 * Check for the state of the receive buffer.
+			 */
+			if (sk->rmem_alloc < (sk->rcvbuf / 2) && (sk->protinfo.x25->condition & X25_COND_OWN_RX_BUSY)) {
+				sk->protinfo.x25->condition &= ~X25_COND_OWN_RX_BUSY;
+				sk->protinfo.x25->condition &= ~X25_COND_ACK_PENDING;
+				sk->protinfo.x25->vl         = sk->protinfo.x25->vr;
+				sk->protinfo.x25->timer      = 0;
+				x25_write_internal(sk, X25_RR);
+				break;
+			}
+			/*
+			 * Check for frames to transmit.
+			 */
+			x25_kick(sk);
+			break;
+
+		default:
+			break;
+	}
+
+	if (sk->protinfo.x25->timer == 0 || --sk->protinfo.x25->timer > 0) {
+		x25_reset_timer(sk);
+		return;
+	}
+
+	/*
+	 * Timer has expired, it may have been T2, T21, T22, or T23. We can tell
+	 * by the state machine state.
+	 */
+	switch (sk->protinfo.x25->state) {
+		case X25_STATE_3:	/* T2 */
+			if (sk->protinfo.x25->condition & X25_COND_ACK_PENDING) {
+				sk->protinfo.x25->condition &= ~X25_COND_ACK_PENDING;
+				x25_enquiry_response(sk);
+			}
+			break;
+
+		case X25_STATE_1:	/* T21 */
+		case X25_STATE_4:	/* T22 */
+			x25_write_internal(sk, X25_CLEAR_REQUEST);
+			sk->protinfo.x25->state = X25_STATE_2;
+			sk->protinfo.x25->timer = sk->protinfo.x25->t23;
+			break;
+
+		case X25_STATE_2:	/* T23 */
+			x25_clear_queues(sk);
+			sk->protinfo.x25->state = X25_STATE_0;
+			sk->state               = TCP_CLOSE;
+			sk->err                 = ETIMEDOUT;
+			sk->shutdown           |= SEND_SHUTDOWN;
+			if (!sk->dead)
+				sk->state_change(sk);
+			sk->dead                = 1;
+			break;
+	}
+
+	x25_set_timer(sk);
+}
+
+#endif