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.
7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
9 #include <linux/errno.h>
10 #include <linux/types.h>
11 #include <linux/socket.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>
20 #include <linux/inet.h>
21 #include <linux/netdevice.h>
22 #include <linux/skbuff.h>
24 #include <asm/uaccess.h>
25 #include <asm/system.h>
26 #include <linux/fcntl.h>
28 #include <linux/interrupt.h>
31 * The following routines are taken from page 170 of the 7th ARRL Computer
32 * Networking Conference paper, as is the whole state machine.
35 void ax25_std_nr_error_recovery(ax25_cb
*ax25
)
37 ax25_std_establish_data_link(ax25
);
40 void ax25_std_establish_data_link(ax25_cb
*ax25
)
42 ax25
->condition
= 0x00;
45 if (ax25
->modulus
== AX25_MODULUS
)
46 ax25_send_control(ax25
, AX25_SABM
, AX25_POLLON
, AX25_COMMAND
);
48 ax25_send_control(ax25
, AX25_SABME
, AX25_POLLON
, AX25_COMMAND
);
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
);
57 void ax25_std_transmit_enquiry(ax25_cb
*ax25
)
59 if (ax25
->condition
& AX25_COND_OWN_RX_BUSY
)
60 ax25_send_control(ax25
, AX25_RNR
, AX25_POLLON
, AX25_COMMAND
);
62 ax25_send_control(ax25
, AX25_RR
, AX25_POLLON
, AX25_COMMAND
);
64 ax25
->condition
&= ~AX25_COND_ACK_PENDING
;
66 ax25_calculate_t1(ax25
);
67 ax25_start_t1timer(ax25
);
70 void ax25_std_enquiry_response(ax25_cb
*ax25
)
72 if (ax25
->condition
& AX25_COND_OWN_RX_BUSY
)
73 ax25_send_control(ax25
, AX25_RNR
, AX25_POLLON
, AX25_RESPONSE
);
75 ax25_send_control(ax25
, AX25_RR
, AX25_POLLON
, AX25_RESPONSE
);
77 ax25
->condition
&= ~AX25_COND_ACK_PENDING
;
80 void ax25_std_timeout_response(ax25_cb
*ax25
)
82 if (ax25
->condition
& AX25_COND_OWN_RX_BUSY
)
83 ax25_send_control(ax25
, AX25_RNR
, AX25_POLLOFF
, AX25_RESPONSE
);
85 ax25_send_control(ax25
, AX25_RR
, AX25_POLLOFF
, AX25_RESPONSE
);
87 ax25
->condition
&= ~AX25_COND_ACK_PENDING
;
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