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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
236 lines
5.7 KiB
C
236 lines
5.7 KiB
C
// 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 (g4klx@g4klx.demon.co.uk)
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* Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
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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/spinlock.h>
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#include <linux/in.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 <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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static void ax25_ds_timeout(struct timer_list *);
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/*
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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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* 1/10th of a second.
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*/
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void ax25_ds_setup_timer(ax25_dev *ax25_dev)
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{
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timer_setup(&ax25_dev->dama.slave_timer, ax25_ds_timeout, 0);
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}
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void ax25_ds_del_timer(ax25_dev *ax25_dev)
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{
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if (ax25_dev)
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del_timer(&ax25_dev->dama.slave_timer);
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}
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void ax25_ds_set_timer(ax25_dev *ax25_dev)
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{
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if (ax25_dev == NULL) /* paranoia */
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return;
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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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}
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/*
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* DAMA Slave Timeout
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* Silently discard all (slave) connections in case our master forgot us...
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*/
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static void ax25_ds_timeout(struct timer_list *t)
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{
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ax25_dev *ax25_dev = from_timer(ax25_dev, t, dama.slave_timer);
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ax25_cb *ax25;
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if (ax25_dev == NULL || !ax25_dev->dama.slave)
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return; /* Yikes! */
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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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return;
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}
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spin_lock(&ax25_list_lock);
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ax25_for_each(ax25, &ax25_list) {
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if (ax25->ax25_dev != ax25_dev || !(ax25->condition & AX25_COND_DAMA_MODE))
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continue;
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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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}
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spin_unlock(&ax25_list_lock);
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ax25_dev_dama_off(ax25_dev);
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}
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void ax25_ds_heartbeat_expiry(ax25_cb *ax25)
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{
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struct sock *sk=ax25->sk;
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if (sk)
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bh_lock_sock(sk);
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switch (ax25->state) {
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case AX25_STATE_0:
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case AX25_STATE_2:
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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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if (sk) {
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sock_hold(sk);
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ax25_destroy_socket(ax25);
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bh_unlock_sock(sk);
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/* Ungrab socket and destroy it */
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sock_put(sk);
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} else
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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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/*
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* Check the state of the receive buffer.
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*/
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if (sk != NULL) {
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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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break;
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}
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}
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break;
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}
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if (sk)
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bh_unlock_sock(sk);
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ax25_start_heartbeat(ax25);
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}
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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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* connection.
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*/
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void ax25_ds_t3timer_expiry(ax25_cb *ax25)
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{
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ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
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ax25_dama_off(ax25);
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ax25_disconnect(ax25, ETIMEDOUT);
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}
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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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* I frames.
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*/
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void ax25_ds_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->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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}
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bh_unlock_sock(ax25->sk);
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}
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}
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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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*
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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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*/
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void ax25_ds_t1_timeout(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_POLLOFF, 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_POLLOFF, AX25_COMMAND);
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else
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ax25_send_control(ax25, AX25_SABME, AX25_POLLOFF, 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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if (!sock_flag(ax25->sk, SOCK_DESTROY))
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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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}
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break;
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case AX25_STATE_3:
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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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}
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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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