| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
| 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> |
| 19 | #include <net/ax25.h> |
| 20 | #include <linux/inet.h> |
| 21 | #include <linux/netdevice.h> |
| 22 | #include <linux/skbuff.h> |
| 23 | #include <net/sock.h> |
| 24 | #include <asm/uaccess.h> |
| 25 | #include <asm/system.h> |
| 26 | #include <linux/fcntl.h> |
| 27 | #include <linux/mm.h> |
| 28 | #include <linux/interrupt.h> |
| 29 | |
| 30 | /* |
| 31 | * The following routines are taken from page 170 of the 7th ARRL Computer |
| 32 | * Networking Conference paper, as is the whole state machine. |
| 33 | */ |
| 34 | |
| 35 | void ax25_std_nr_error_recovery(ax25_cb *ax25) |
| 36 | { |
| 37 | ax25_std_establish_data_link(ax25); |
| 38 | } |
| 39 | |
| 40 | void ax25_std_establish_data_link(ax25_cb *ax25) |
| 41 | { |
| 42 | ax25->condition = 0x00; |
| 43 | ax25->n2count = 0; |
| 44 | |
| 45 | if (ax25->modulus == AX25_MODULUS) |
| 46 | ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND); |
| 47 | else |
| 48 | ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND); |
| 49 | |
| 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); |
| 55 | } |
| 56 | |
| 57 | void ax25_std_transmit_enquiry(ax25_cb *ax25) |
| 58 | { |
| 59 | if (ax25->condition & AX25_COND_OWN_RX_BUSY) |
| 60 | ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_COMMAND); |
| 61 | else |
| 62 | ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_COMMAND); |
| 63 | |
| 64 | ax25->condition &= ~AX25_COND_ACK_PENDING; |
| 65 | |
| 66 | ax25_calculate_t1(ax25); |
| 67 | ax25_start_t1timer(ax25); |
| 68 | } |
| 69 | |
| 70 | void ax25_std_enquiry_response(ax25_cb *ax25) |
| 71 | { |
| 72 | if (ax25->condition & AX25_COND_OWN_RX_BUSY) |
| 73 | ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_RESPONSE); |
| 74 | else |
| 75 | ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_RESPONSE); |
| 76 | |
| 77 | ax25->condition &= ~AX25_COND_ACK_PENDING; |
| 78 | } |
| 79 | |
| 80 | void ax25_std_timeout_response(ax25_cb *ax25) |
| 81 | { |
| 82 | if (ax25->condition & AX25_COND_OWN_RX_BUSY) |
| 83 | ax25_send_control(ax25, AX25_RNR, AX25_POLLOFF, AX25_RESPONSE); |
| 84 | else |
| 85 | ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE); |
| 86 | |
| 87 | ax25->condition &= ~AX25_COND_ACK_PENDING; |
| 88 | } |