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83 lines
2.1 KiB
83 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* |
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* Copyright (C) Jonathan Naylor G4KLX ([email protected]) |
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*/ |
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#include <linux/errno.h> |
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#include <linux/types.h> |
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#include <linux/socket.h> |
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#include <linux/in.h> |
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#include <linux/kernel.h> |
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#include <linux/timer.h> |
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#include <linux/string.h> |
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#include <linux/sockios.h> |
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#include <linux/net.h> |
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#include <net/ax25.h> |
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#include <linux/inet.h> |
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#include <linux/netdevice.h> |
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#include <linux/skbuff.h> |
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#include <net/sock.h> |
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#include <linux/uaccess.h> |
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#include <linux/fcntl.h> |
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#include <linux/mm.h> |
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#include <linux/interrupt.h> |
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/* |
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* The following routines are taken from page 170 of the 7th ARRL Computer |
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* Networking Conference paper, as is the whole state machine. |
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*/ |
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void ax25_std_nr_error_recovery(ax25_cb *ax25) |
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{ |
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ax25_std_establish_data_link(ax25); |
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} |
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void ax25_std_establish_data_link(ax25_cb *ax25) |
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{ |
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ax25->condition = 0x00; |
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ax25->n2count = 0; |
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if (ax25->modulus == AX25_MODULUS) |
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ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND); |
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else |
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ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND); |
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ax25_calculate_t1(ax25); |
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ax25_stop_idletimer(ax25); |
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ax25_stop_t3timer(ax25); |
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ax25_stop_t2timer(ax25); |
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ax25_start_t1timer(ax25); |
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} |
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void ax25_std_transmit_enquiry(ax25_cb *ax25) |
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{ |
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if (ax25->condition & AX25_COND_OWN_RX_BUSY) |
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ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_COMMAND); |
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else |
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ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_COMMAND); |
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ax25->condition &= ~AX25_COND_ACK_PENDING; |
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ax25_calculate_t1(ax25); |
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ax25_start_t1timer(ax25); |
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} |
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void ax25_std_enquiry_response(ax25_cb *ax25) |
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{ |
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if (ax25->condition & AX25_COND_OWN_RX_BUSY) |
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ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_RESPONSE); |
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else |
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ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_RESPONSE); |
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ax25->condition &= ~AX25_COND_ACK_PENDING; |
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} |
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void ax25_std_timeout_response(ax25_cb *ax25) |
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{ |
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if (ax25->condition & AX25_COND_OWN_RX_BUSY) |
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ax25_send_control(ax25, AX25_RNR, AX25_POLLOFF, AX25_RESPONSE); |
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else |
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ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE); |
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ax25->condition &= ~AX25_COND_ACK_PENDING; |
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}
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