1 files changed, 88 insertions, 0 deletions

diff --git a/net/ax25/ax25_std_subr.c b/net/ax25/ax25_std_subr.c
new file mode 100644
index 000000000000..2b3c801ae486
--- /dev/null
+++ b/net/ax25/ax25_std_subr.c
@@ -0,0 +1,88 @@
+/*
+ * This program 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.
+ *
+ * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
+ */
+#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_calculate_t1(ax25);
+        ax25_stop_idletimer(ax25);
+        ax25_stop_t3timer(ax25);
+        ax25_stop_t2timer(ax25);
+        ax25_start_t1timer(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_calculate_t1(ax25);
+        ax25_start_t1timer(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;
+}