blob: 277f81bb979a6f0dc0d19b754a0f7e356753f7c7 [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>
23#include <asm/uaccess.h>
24#include <asm/system.h>
25#include <linux/fcntl.h>
26#include <linux/mm.h>
27#include <linux/interrupt.h>
28
29/*
30 * The following routines are taken from page 170 of the 7th ARRL Computer
31 * Networking Conference paper, as is the whole state machine.
32 */
33
34void ax25_std_nr_error_recovery(ax25_cb *ax25)
35{
36 ax25_std_establish_data_link(ax25);
37}
38
39void ax25_std_establish_data_link(ax25_cb *ax25)
40{
41 ax25->condition = 0x00;
42 ax25->n2count = 0;
43
44 if (ax25->modulus == AX25_MODULUS)
45 ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
46 else
47 ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND);
48
49 ax25_calculate_t1(ax25);
50 ax25_stop_idletimer(ax25);
51 ax25_stop_t3timer(ax25);
52 ax25_stop_t2timer(ax25);
53 ax25_start_t1timer(ax25);
54}
55
56void ax25_std_transmit_enquiry(ax25_cb *ax25)
57{
58 if (ax25->condition & AX25_COND_OWN_RX_BUSY)
59 ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_COMMAND);
60 else
61 ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_COMMAND);
62
63 ax25->condition &= ~AX25_COND_ACK_PENDING;
64
65 ax25_calculate_t1(ax25);
66 ax25_start_t1timer(ax25);
67}
68
69void ax25_std_enquiry_response(ax25_cb *ax25)
70{
71 if (ax25->condition & AX25_COND_OWN_RX_BUSY)
72 ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_RESPONSE);
73 else
74 ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_RESPONSE);
75
76 ax25->condition &= ~AX25_COND_ACK_PENDING;
77}
78
79void ax25_std_timeout_response(ax25_cb *ax25)
80{
81 if (ax25->condition & AX25_COND_OWN_RX_BUSY)
82 ax25_send_control(ax25, AX25_RNR, AX25_POLLOFF, AX25_RESPONSE);
83 else
84 ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
85
86 ax25->condition &= ~AX25_COND_ACK_PENDING;
87}