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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * |
4 | * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) | |
5 | */ | |
6 | #include <linux/errno.h> | |
7 | #include <linux/types.h> | |
8 | #include <linux/socket.h> | |
9 | #include <linux/in.h> | |
10 | #include <linux/kernel.h> | |
1da177e4 LT |
11 | #include <linux/timer.h> |
12 | #include <linux/string.h> | |
13 | #include <linux/sockios.h> | |
14 | #include <linux/net.h> | |
15 | #include <net/ax25.h> | |
16 | #include <linux/inet.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <net/sock.h> | |
7c0f6ba6 | 20 | #include <linux/uaccess.h> |
1da177e4 LT |
21 | #include <linux/fcntl.h> |
22 | #include <linux/mm.h> | |
23 | #include <linux/interrupt.h> | |
24 | ||
25 | /* | |
26 | * The following routines are taken from page 170 of the 7th ARRL Computer | |
27 | * Networking Conference paper, as is the whole state machine. | |
28 | */ | |
29 | ||
30 | void ax25_std_nr_error_recovery(ax25_cb *ax25) | |
31 | { | |
32 | ax25_std_establish_data_link(ax25); | |
33 | } | |
34 | ||
35 | void ax25_std_establish_data_link(ax25_cb *ax25) | |
36 | { | |
37 | ax25->condition = 0x00; | |
38 | ax25->n2count = 0; | |
39 | ||
40 | if (ax25->modulus == AX25_MODULUS) | |
41 | ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND); | |
42 | else | |
43 | ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND); | |
44 | ||
45 | ax25_calculate_t1(ax25); | |
46 | ax25_stop_idletimer(ax25); | |
47 | ax25_stop_t3timer(ax25); | |
48 | ax25_stop_t2timer(ax25); | |
49 | ax25_start_t1timer(ax25); | |
50 | } | |
51 | ||
52 | void ax25_std_transmit_enquiry(ax25_cb *ax25) | |
53 | { | |
54 | if (ax25->condition & AX25_COND_OWN_RX_BUSY) | |
55 | ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_COMMAND); | |
56 | else | |
57 | ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_COMMAND); | |
58 | ||
59 | ax25->condition &= ~AX25_COND_ACK_PENDING; | |
60 | ||
61 | ax25_calculate_t1(ax25); | |
62 | ax25_start_t1timer(ax25); | |
63 | } | |
64 | ||
65 | void ax25_std_enquiry_response(ax25_cb *ax25) | |
66 | { | |
67 | if (ax25->condition & AX25_COND_OWN_RX_BUSY) | |
68 | ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_RESPONSE); | |
69 | else | |
70 | ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_RESPONSE); | |
71 | ||
72 | ax25->condition &= ~AX25_COND_ACK_PENDING; | |
73 | } | |
74 | ||
75 | void ax25_std_timeout_response(ax25_cb *ax25) | |
76 | { | |
77 | if (ax25->condition & AX25_COND_OWN_RX_BUSY) | |
78 | ax25_send_control(ax25, AX25_RNR, AX25_POLLOFF, AX25_RESPONSE); | |
79 | else | |
80 | ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE); | |
81 | ||
82 | ax25->condition &= ~AX25_COND_ACK_PENDING; | |
83 | } |