From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 net/ax25/ax25_std_subr.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 net/ax25/ax25_std_subr.c

(limited to 'net/ax25/ax25_std_subr.c')

diff --git a/net/ax25/ax25_std_subr.c b/net/ax25/ax25_std_subr.c
new file mode 100644
index 000000000..4c36f1342
--- /dev/null
+++ b/net/ax25/ax25_std_subr.c
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * 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/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 <linux/uaccess.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;
+}
-- 
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