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1da177e4 LT |
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> | |
1da177e4 LT |
14 | #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> | |
1da177e4 LT |
24 | #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 | ||
33 | void ax25_std_nr_error_recovery(ax25_cb *ax25) | |
34 | { | |
35 | ax25_std_establish_data_link(ax25); | |
36 | } | |
37 | ||
38 | void 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 | ||
55 | void 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 | ||
68 | void 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 | ||
78 | void 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 | } |