tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 */
9#include <linux/errno.h>
10#include <linux/types.h>
11#include <linux/socket.h>
12#include <linux/in.h>
13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/timer.h>
16#include <linux/string.h>
17#include <linux/sockios.h>
18#include <linux/net.h>
19#include <net/ax25.h>
20#include <linux/inet.h>
21#include <linux/netdevice.h>
22#include <linux/skbuff.h>
23#include <net/sock.h>
24#include <asm/uaccess.h>
25#include <asm/system.h>
26#include <linux/fcntl.h>
27#include <linux/mm.h>
28#include <linux/interrupt.h>
29
30/*
31 * The following routines are taken from page 170 of the 7th ARRL Computer
32 * Networking Conference paper, as is the whole state machine.
33 */
34
35void ax25_std_nr_error_recovery(ax25_cb *ax25)
36{
37 ax25_std_establish_data_link(ax25);
38}
39
40void ax25_std_establish_data_link(ax25_cb *ax25)
41{
42 ax25->condition = 0x00;
43 ax25->n2count = 0;
44
45 if (ax25->modulus == AX25_MODULUS)
46 ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
47 else
48 ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND);
49
50 ax25_calculate_t1(ax25);
51 ax25_stop_idletimer(ax25);
52 ax25_stop_t3timer(ax25);
53 ax25_stop_t2timer(ax25);
54 ax25_start_t1timer(ax25);
55}
56
57void ax25_std_transmit_enquiry(ax25_cb *ax25)
58{
59 if (ax25->condition & AX25_COND_OWN_RX_BUSY)
60 ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_COMMAND);
61 else
62 ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_COMMAND);
63
64 ax25->condition &= ~AX25_COND_ACK_PENDING;
65
66 ax25_calculate_t1(ax25);
67 ax25_start_t1timer(ax25);
68}
69
70void ax25_std_enquiry_response(ax25_cb *ax25)
71{
72 if (ax25->condition & AX25_COND_OWN_RX_BUSY)
73 ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_RESPONSE);
74 else
75 ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_RESPONSE);
76
77 ax25->condition &= ~AX25_COND_ACK_PENDING;
78}
79
80void ax25_std_timeout_response(ax25_cb *ax25)
81{
82 if (ax25->condition & AX25_COND_OWN_RX_BUSY)
83 ax25_send_control(ax25, AX25_RNR, AX25_POLLOFF, AX25_RESPONSE);
84 else
85 ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
86
87 ax25->condition &= ~AX25_COND_ACK_PENDING;
88}