^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/sockios.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <net/ax25.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * The following routines are taken from page 170 of the 7th ARRL Computer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * Networking Conference paper, as is the whole state machine.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) void ax25_std_nr_error_recovery(ax25_cb *ax25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) ax25_std_establish_data_link(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) void ax25_std_establish_data_link(ax25_cb *ax25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) ax25->condition = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) ax25->n2count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (ax25->modulus == AX25_MODULUS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) ax25_calculate_t1(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) ax25_stop_idletimer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) ax25_stop_t3timer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) ax25_stop_t2timer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) ax25_start_t1timer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) void ax25_std_transmit_enquiry(ax25_cb *ax25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (ax25->condition & AX25_COND_OWN_RX_BUSY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_COMMAND);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_COMMAND);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) ax25->condition &= ~AX25_COND_ACK_PENDING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ax25_calculate_t1(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) ax25_start_t1timer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) void ax25_std_enquiry_response(ax25_cb *ax25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (ax25->condition & AX25_COND_OWN_RX_BUSY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_RESPONSE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_RESPONSE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) ax25->condition &= ~AX25_COND_ACK_PENDING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) void ax25_std_timeout_response(ax25_cb *ax25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (ax25->condition & AX25_COND_OWN_RX_BUSY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) ax25_send_control(ax25, AX25_RNR, AX25_POLLOFF, AX25_RESPONSE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) ax25->condition &= ~AX25_COND_ACK_PENDING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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