patch-2.1.27 linux/net/ax25/ax25_std_timer.c

• Lines: 218
• Date: Tue Feb 25 17:12:51 1997
• Orig file: v2.1.26/linux/net/ax25/ax25_std_timer.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.26/linux/net/ax25/ax25_std_timer.c linux/net/ax25/ax25_std_timer.c
@@ -0,0 +1,217 @@
+/*
+ *	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 028a	Jonathan(G4KLX)	New state machine based on SDL diagrams.
+ *	AX.25 028b	Jonathan(G4KLX)	Extracted AX25 control block from the
+ *					sock structure.
+ *	AX.25 029	Alan(GW4PTS)	Switched to KA9Q constant names.
+ *	AX.25 031	Joerg(DL1BKE)	Added DAMA support
+ *	AX.25 032	Joerg(DL1BKE)	Fixed DAMA timeout bug
+ *	AX.25 033	Jonathan(G4KLX)	Modularisation functions.
+ *	AX.25 035	Frederic(F1OAT)	Support for pseudo-digipeating.
+ *	AX.25 036	Jonathan(G4KLX)	Split from ax25_timer.c.
+ */
+
+#include <linux/config.h>
+#if defined(CONFIG_AX25) || defined(CONFIG_AX25_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 <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>
+
+void ax25_std_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 (ax25->sk->rmem_alloc < (ax25->sk->rcvbuf / 2) && (ax25->condition & AX25_COND_OWN_RX_BUSY)) {
+					ax25->condition &= ~AX25_COND_OWN_RX_BUSY;
+					ax25->condition &= ~AX25_COND_ACK_PENDING;
+					ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
+					break;
+				}
+			}
+			/*
+			 * Check for frames to transmit.
+			 */
+			ax25_kick(ax25);
+			break;
+
+		default:
+			break;
+	}
+
+	if (ax25->t2timer > 0 && --ax25->t2timer == 0) {
+		if (ax25->state == AX25_STATE_3 || ax25->state == AX25_STATE_4) {
+			if (ax25->condition & AX25_COND_ACK_PENDING) {
+				ax25->condition &= ~AX25_COND_ACK_PENDING;
+				ax25_std_timeout_response(ax25);
+			}
+		}
+	}
+
+	if (ax25->t3timer > 0 && --ax25->t3timer == 0) {
+		if (ax25->state == AX25_STATE_3) {
+			ax25->n2count = 0;
+			ax25_std_transmit_enquiry(ax25);
+			ax25->state   = AX25_STATE_4;
+		}
+		ax25->t3timer = ax25->t3;
+	}
+
+	if (ax25->idletimer > 0 && --ax25->idletimer == 0) {
+		/* dl1bke 960228: close the connection when IDLE expires */
+		/* 		  similar to DAMA T3 timeout but with    */
+		/* 		  a "clean" disconnect of the connection */
+
+		ax25_clear_queues(ax25);
+
+		ax25->n2count = 0;
+		ax25->t3timer = 0;
+		ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+		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;
+		}
+	}
+
+	if (ax25->t1timer == 0 || --ax25->t1timer > 0) {
+		ax25_set_timer(ax25);
+		return;
+	}
+
+	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_POLLON, AX25_COMMAND);
+				}
+			} else {
+				ax25->n2count++;
+				if (ax25->modulus == AX25_MODULUS)
+					ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
+				else
+					ax25_send_control(ax25, AX25_SABME, AX25_POLLON, 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++;
+				ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+			}
+			break;
+
+		case AX25_STATE_3: 
+			ax25->n2count = 1;
+			ax25_std_transmit_enquiry(ax25);
+			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++;
+				ax25_std_transmit_enquiry(ax25);
+			}
+			break;
+	}
+
+	ax25->t1timer = ax25->t1 = ax25_calculate_t1(ax25);
+
+	ax25_set_timer(ax25);
+}
+
+#endif