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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/ax25/ax25_std_subr.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/ax25/ax25_std_subr.c')
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1 files changed, 88 insertions, 0 deletions
diff --git a/net/ax25/ax25_std_subr.c b/net/ax25/ax25_std_subr.c
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+++ b/net/ax25/ax25_std_subr.c
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+/*
+ * 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;
+}