patch-2.1.27 linux/net/ax25/ax25_std_subr.c

• Lines: 106
• Date: Tue Feb 25 17:12:51 1997
• Orig file: v2.1.26/linux/net/ax25/ax25_std_subr.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.26/linux/net/ax25/ax25_std_subr.c linux/net/ax25/ax25_std_subr.c
@@ -0,0 +1,105 @@
+/*
+ *	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.
+ *
+ *	Most of this code is based on the SDL diagrams published in the 7th
+ *	ARRL Computer Networking Conference papers. The diagrams have mistakes
+ *	in them, but are mostly correct. Before you modify the code could you
+ *	read the SDL diagrams as the code is not obvious and probably very
+ *	easy to break;
+ *
+ *	History
+ *	AX.25 036	Jonathan(G4KLX)	Split from ax25_out.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>
+
+/*
+ * The following routines are taken from page 170 of the 7th ARRL Computer
+ * Networking Conference paper, as is the whole state machine.
+ */
+
+void ax25_std_nr_error_recovery(ax25_cb *ax25)
+{
+	ax25_std_establish_data_link(ax25);
+}
+
+void ax25_std_establish_data_link(ax25_cb *ax25)
+{
+	ax25->condition = 0x00;
+	ax25->n2count   = 0;
+
+	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);
+
+	ax25->t3timer = 0;
+	ax25->t2timer = 0;
+	ax25->t1timer = ax25->t1 = ax25_calculate_t1(ax25);
+}
+
+void ax25_std_transmit_enquiry(ax25_cb *ax25)
+{
+	if (ax25->condition & AX25_COND_OWN_RX_BUSY)
+		ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_COMMAND);
+	else
+		ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_COMMAND);
+
+	ax25->condition &= ~AX25_COND_ACK_PENDING;
+
+	ax25->t1timer = ax25->t1 = ax25_calculate_t1(ax25);
+}
+ 	
+void ax25_std_enquiry_response(ax25_cb *ax25)
+{
+	if (ax25->condition & AX25_COND_OWN_RX_BUSY)
+		ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_RESPONSE);
+	else
+		ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_RESPONSE);
+
+	ax25->condition &= ~AX25_COND_ACK_PENDING;
+}
+
+void ax25_std_timeout_response(ax25_cb *ax25)
+{
+	if (ax25->condition & AX25_COND_OWN_RX_BUSY)
+		ax25_send_control(ax25, AX25_RNR, AX25_POLLOFF, AX25_RESPONSE);
+	else
+		ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
+
+	ax25->condition &= ~AX25_COND_ACK_PENDING;
+}
+
+#endif