cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ax25_std_subr.c (2100B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      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>
     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>
     20#include <linux/uaccess.h>
     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
     30void ax25_std_nr_error_recovery(ax25_cb *ax25)
     31{
     32	ax25_std_establish_data_link(ax25);
     33}
     34
     35void 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
     52void 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
     65void 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
     75void 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}