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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
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* Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
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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/spinlock.h>
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#include <linux/kernel.h>
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#include <linux/jiffies.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/tcp_states.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 <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/interrupt.h>
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static void ax25_ds_timeout(unsigned long);
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* Add DAMA slave timeout timer to timer list.
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* Unlike the connection based timers the timeout function gets
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* triggered every second. Please note that NET_AX25_DAMA_SLAVE_TIMEOUT
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* (aka /proc/sys/net/ax25/{dev}/dama_slave_timeout) is still in
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void ax25_ds_setup_timer(ax25_dev *ax25_dev)
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setup_timer(&ax25_dev->dama.slave_timer, ax25_ds_timeout,
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(unsigned long)ax25_dev);
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void ax25_ds_del_timer(ax25_dev *ax25_dev)
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del_timer(&ax25_dev->dama.slave_timer);
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void ax25_ds_set_timer(ax25_dev *ax25_dev)
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if (ax25_dev == NULL) /* paranoia */
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ax25_dev->dama.slave_timeout =
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msecs_to_jiffies(ax25_dev->values[AX25_VALUES_DS_TIMEOUT]) / 10;
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mod_timer(&ax25_dev->dama.slave_timer, jiffies + HZ);
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* Silently discard all (slave) connections in case our master forgot us...
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static void ax25_ds_timeout(unsigned long arg)
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ax25_dev *ax25_dev = (struct ax25_dev *) arg;
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struct hlist_node *node;
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if (ax25_dev == NULL || !ax25_dev->dama.slave)
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if (!ax25_dev->dama.slave_timeout || --ax25_dev->dama.slave_timeout) {
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ax25_ds_set_timer(ax25_dev);
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spin_lock(&ax25_list_lock);
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ax25_for_each(ax25, node, &ax25_list) {
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if (ax25->ax25_dev != ax25_dev || !(ax25->condition & AX25_COND_DAMA_MODE))
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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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spin_unlock(&ax25_list_lock);
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ax25_dev_dama_off(ax25_dev);
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void ax25_ds_heartbeat_expiry(ax25_cb *ax25)
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struct sock *sk=ax25->sk;
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switch (ax25->state) {
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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 (!sk || sock_flag(sk, SOCK_DESTROY) ||
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(sk->sk_state == TCP_LISTEN &&
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sock_flag(sk, SOCK_DEAD))) {
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ax25_destroy_socket(ax25);
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ax25_destroy_socket(ax25);
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* Check the state of the receive buffer.
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if (atomic_read(&sk->sk_rmem_alloc) <
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(sk->sk_rcvbuf >> 1) &&
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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_start_heartbeat(ax25);
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/* dl1bke 960114: T3 works much like the IDLE timeout, but
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* gets reloaded with every frame for this
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void ax25_ds_t3timer_expiry(ax25_cb *ax25)
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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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/* dl1bke 960228: close the connection when IDLE expires.
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* unlike T3 this timer gets reloaded only on
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void ax25_ds_idletimer_expiry(ax25_cb *ax25)
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ax25_clear_queues(ax25);
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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_t3timer(ax25);
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if (ax25->sk != NULL) {
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bh_lock_sock(ax25->sk);
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ax25->sk->sk_state = TCP_CLOSE;
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ax25->sk->sk_err = 0;
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ax25->sk->sk_shutdown |= SEND_SHUTDOWN;
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if (!sock_flag(ax25->sk, SOCK_DEAD)) {
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ax25->sk->sk_state_change(ax25->sk);
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sock_set_flag(ax25->sk, SOCK_DEAD);
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bh_unlock_sock(ax25->sk);
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/* dl1bke 960114: The DAMA protocol requires to send data and SABM/DISC
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* within the poll of any connected channel. Remember
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* that we are not allowed to send anything unless we
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* get polled by the Master.
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* Thus we'll have to do parts of our T1 handling in
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* ax25_enquiry_response().
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void ax25_ds_t1_timeout(ax25_cb *ax25)
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switch (ax25->state) {
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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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ax25->modulus = AX25_MODULUS;
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ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
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ax25_send_control(ax25, AX25_SABM, AX25_POLLOFF, AX25_COMMAND);
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if (ax25->modulus == AX25_MODULUS)
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ax25_send_control(ax25, AX25_SABM, AX25_POLLOFF, AX25_COMMAND);
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ax25_send_control(ax25, AX25_SABME, AX25_POLLOFF, AX25_COMMAND);
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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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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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ax25_calculate_t1(ax25);
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ax25_start_t1timer(ax25);