blob: 94bd06396a43a274b5347b7a90330faa6fb03268 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/timer.h>
15#include <linux/string.h>
16#include <linux/sockios.h>
17#include <linux/net.h>
18#include <net/ax25.h>
19#include <linux/inet.h>
20#include <linux/netdevice.h>
21#include <linux/skbuff.h>
22#include <net/sock.h>
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080023#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/fcntl.h>
25#include <linux/mm.h>
26#include <linux/interrupt.h>
27
28/*
29 * The following routines are taken from page 170 of the 7th ARRL Computer
30 * Networking Conference paper, as is the whole state machine.
31 */
32
33void ax25_std_nr_error_recovery(ax25_cb *ax25)
34{
35 ax25_std_establish_data_link(ax25);
36}
37
38void ax25_std_establish_data_link(ax25_cb *ax25)
39{
40 ax25->condition = 0x00;
41 ax25->n2count = 0;
42
43 if (ax25->modulus == AX25_MODULUS)
44 ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
45 else
46 ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND);
47
48 ax25_calculate_t1(ax25);
49 ax25_stop_idletimer(ax25);
50 ax25_stop_t3timer(ax25);
51 ax25_stop_t2timer(ax25);
52 ax25_start_t1timer(ax25);
53}
54
55void ax25_std_transmit_enquiry(ax25_cb *ax25)
56{
57 if (ax25->condition & AX25_COND_OWN_RX_BUSY)
58 ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_COMMAND);
59 else
60 ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_COMMAND);
61
62 ax25->condition &= ~AX25_COND_ACK_PENDING;
63
64 ax25_calculate_t1(ax25);
65 ax25_start_t1timer(ax25);
66}
67
68void ax25_std_enquiry_response(ax25_cb *ax25)
69{
70 if (ax25->condition & AX25_COND_OWN_RX_BUSY)
71 ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_RESPONSE);
72 else
73 ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_RESPONSE);
74
75 ax25->condition &= ~AX25_COND_ACK_PENDING;
76}
77
78void ax25_std_timeout_response(ax25_cb *ax25)
79{
80 if (ax25->condition & AX25_COND_OWN_RX_BUSY)
81 ax25_send_control(ax25, AX25_RNR, AX25_POLLOFF, AX25_RESPONSE);
82 else
83 ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
84
85 ax25->condition &= ~AX25_COND_ACK_PENDING;
86}