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1275 |
phoenix |
/*
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* AX.25 release 037
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*
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* This code REQUIRES 2.1.15 or higher/ NET3.038
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*
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* This module:
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* This module is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* History
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* AX.25 028a Jonathan(G4KLX) New state machine based on SDL diagrams.
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* AX.25 028b Jonathan(G4KLX) Extracted AX25 control block from the
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* sock structure.
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* AX.25 029 Alan(GW4PTS) Switched to KA9Q constant names.
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* AX.25 031 Joerg(DL1BKE) Added DAMA support
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* AX.25 032 Joerg(DL1BKE) Fixed DAMA timeout bug
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* AX.25 033 Jonathan(G4KLX) Modularisation functions.
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* AX.25 035 Frederic(F1OAT) Support for pseudo-digipeating.
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* AX.25 036 Jonathan(G4KLX) Split from ax25_timer.c.
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* AX.25 037 Jonathan(G4KLX) New timer architecture.
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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/sched.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 <asm/uaccess.h>
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#include <asm/system.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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void ax25_std_heartbeat_expiry(ax25_cb *ax25)
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{
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switch (ax25->state) {
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case AX25_STATE_0:
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/* Magic here: If we listen() and a new link dies before it
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is accepted() it isn't 'dead' so doesn't get removed. */
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if (ax25->sk == NULL || ax25->sk->destroy || (ax25->sk->state == TCP_LISTEN && ax25->sk->dead)) {
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ax25_destroy_socket(ax25);
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return;
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}
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break;
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case AX25_STATE_3:
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case AX25_STATE_4:
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/*
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* Check the state of the receive buffer.
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*/
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if (ax25->sk != NULL) {
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if (atomic_read(&ax25->sk->rmem_alloc) < (ax25->sk->rcvbuf / 2) &&
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(ax25->condition & AX25_COND_OWN_RX_BUSY)) {
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ax25->condition &= ~AX25_COND_OWN_RX_BUSY;
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ax25->condition &= ~AX25_COND_ACK_PENDING;
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ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
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break;
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}
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}
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}
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ax25_start_heartbeat(ax25);
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}
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void ax25_std_t2timer_expiry(ax25_cb *ax25)
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{
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if (ax25->condition & AX25_COND_ACK_PENDING) {
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ax25->condition &= ~AX25_COND_ACK_PENDING;
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ax25_std_timeout_response(ax25);
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}
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}
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void ax25_std_t3timer_expiry(ax25_cb *ax25)
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{
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ax25->n2count = 0;
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ax25_std_transmit_enquiry(ax25);
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ax25->state = AX25_STATE_4;
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}
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void ax25_std_idletimer_expiry(ax25_cb *ax25)
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{
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ax25_clear_queues(ax25);
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ax25->n2count = 0;
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ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
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ax25->state = AX25_STATE_2;
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ax25_calculate_t1(ax25);
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ax25_start_t1timer(ax25);
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ax25_stop_t2timer(ax25);
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ax25_stop_t3timer(ax25);
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if (ax25->sk != NULL) {
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ax25->sk->state = TCP_CLOSE;
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ax25->sk->err = 0;
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ax25->sk->shutdown |= SEND_SHUTDOWN;
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if (!ax25->sk->dead)
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ax25->sk->state_change(ax25->sk);
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ax25->sk->dead = 1;
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}
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}
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void ax25_std_t1timer_expiry(ax25_cb *ax25)
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{
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switch (ax25->state) {
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case AX25_STATE_1:
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if (ax25->n2count == ax25->n2) {
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if (ax25->modulus == AX25_MODULUS) {
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ax25_disconnect(ax25, ETIMEDOUT);
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return;
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} else {
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ax25->modulus = AX25_MODULUS;
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ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
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ax25->n2count = 0;
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ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
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}
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} else {
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ax25->n2count++;
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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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}
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break;
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case AX25_STATE_2:
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if (ax25->n2count == ax25->n2) {
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ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
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ax25_disconnect(ax25, ETIMEDOUT);
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return;
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} else {
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ax25->n2count++;
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ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
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}
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break;
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case AX25_STATE_3:
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ax25->n2count = 1;
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ax25_std_transmit_enquiry(ax25);
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ax25->state = AX25_STATE_4;
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break;
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case AX25_STATE_4:
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if (ax25->n2count == ax25->n2) {
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ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
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ax25_disconnect(ax25, ETIMEDOUT);
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return;
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} else {
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ax25->n2count++;
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ax25_std_transmit_enquiry(ax25);
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}
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break;
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}
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ax25_calculate_t1(ax25);
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ax25_start_t1timer(ax25);
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}
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