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235 lines
5.7 KiB
235 lines
5.7 KiB
// 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 ([email protected]) |
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* Copyright (C) Joerg Reuter DL1BKE ([email protected]) |
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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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