1 files changed, 177 insertions, 0 deletions

diff --git a/net/ax25/ax25_std_timer.c b/net/ax25/ax25_std_timer.c
new file mode 100644
index 000000000000..066897bc0749
--- /dev/null
+++ b/net/ax25/ax25_std_timer.c
@@ -0,0 +1,177 @@
+/*
+ * 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.
+ *
+ * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
+ * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
+ * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
+ * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
+ */
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <net/ax25.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+
+void ax25_std_heartbeat_expiry(ax25_cb *ax25)
+{
+        struct sock *sk=ax25->sk;
+        
+        if (sk)
+                bh_lock_sock(sk);
+
+        switch (ax25->state) {
+        case AX25_STATE_0:
+                /* Magic here: If we listen() and a new link dies before it
+                   is accepted() it isn't 'dead' so doesn't get removed. */
+                if (!sk || sock_flag(sk, SOCK_DESTROY) ||
+                    (sk->sk_state == TCP_LISTEN &&
+                     sock_flag(sk, SOCK_DEAD))) {
+                        if (sk) {
+                                sock_hold(sk);
+                                ax25_destroy_socket(ax25);
+                                bh_unlock_sock(sk);
+                                sock_put(sk);
+                        } else
+                                ax25_destroy_socket(ax25);
+                        return;
+                }
+                break;
+
+        case AX25_STATE_3:
+        case AX25_STATE_4:
+                /*
+                 * Check the state of the receive buffer.
+                 */
+                if (sk != NULL) {
+                        if (atomic_read(&sk->sk_rmem_alloc) <
+                            (sk->sk_rcvbuf / 2) &&
+                            (ax25->condition & AX25_COND_OWN_RX_BUSY)) {
+                                ax25->condition &= ~AX25_COND_OWN_RX_BUSY;
+                                ax25->condition &= ~AX25_COND_ACK_PENDING;
+                                ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
+                                break;
+                        }
+                }
+        }
+
+        if (sk)
+                bh_unlock_sock(sk);
+
+        ax25_start_heartbeat(ax25);
+}
+
+void ax25_std_t2timer_expiry(ax25_cb *ax25)
+{
+        if (ax25->condition & AX25_COND_ACK_PENDING) {
+                ax25->condition &= ~AX25_COND_ACK_PENDING;
+                ax25_std_timeout_response(ax25);
+        }
+}
+
+void ax25_std_t3timer_expiry(ax25_cb *ax25)
+{
+        ax25->n2count = 0;
+        ax25_std_transmit_enquiry(ax25);
+        ax25->state   = AX25_STATE_4;
+}
+
+void ax25_std_idletimer_expiry(ax25_cb *ax25)
+{
+        ax25_clear_queues(ax25);
+
+        ax25->n2count = 0;
+        ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+        ax25->state   = AX25_STATE_2;
+
+        ax25_calculate_t1(ax25);
+        ax25_start_t1timer(ax25);
+        ax25_stop_t2timer(ax25);
+        ax25_stop_t3timer(ax25);
+
+        if (ax25->sk != NULL) {
+                bh_lock_sock(ax25->sk);
+                ax25->sk->sk_state     = TCP_CLOSE;
+                ax25->sk->sk_err       = 0;
+                ax25->sk->sk_shutdown |= SEND_SHUTDOWN;
+                if (!sock_flag(ax25->sk, SOCK_DEAD)) {
+                        ax25->sk->sk_state_change(ax25->sk);
+                        sock_set_flag(ax25->sk, SOCK_DEAD);
+                }
+                bh_unlock_sock(ax25->sk);
+        }
+}
+
+void ax25_std_t1timer_expiry(ax25_cb *ax25)
+{
+        switch (ax25->state) {
+        case AX25_STATE_1:
+                if (ax25->n2count == ax25->n2) {
+                        if (ax25->modulus == AX25_MODULUS) {
+                                ax25_disconnect(ax25, ETIMEDOUT);
+                                return;
+                        } else {
+                                ax25->modulus = AX25_MODULUS;
+                                ax25->window  = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
+                                ax25->n2count = 0;
+                                ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
+                        }
+                } else {
+                        ax25->n2count++;
+                        if (ax25->modulus == AX25_MODULUS)
+                                ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
+                        else
+                                ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND);
+                }
+                break;
+
+        case AX25_STATE_2:
+                if (ax25->n2count == ax25->n2) {
+                        ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+                        ax25_disconnect(ax25, ETIMEDOUT);
+                        return;
+                } else {
+                        ax25->n2count++;
+                        ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+                }
+                break;
+
+        case AX25_STATE_3:
+                ax25->n2count = 1;
+                ax25_std_transmit_enquiry(ax25);
+                ax25->state   = AX25_STATE_4;
+                break;
+
+        case AX25_STATE_4:
+                if (ax25->n2count == ax25->n2) {
+                        ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
+                        ax25_disconnect(ax25, ETIMEDOUT);
+                        return;
+                } else {
+                        ax25->n2count++;
+                        ax25_std_transmit_enquiry(ax25);
+                }
+                break;
+        }
+
+        ax25_calculate_t1(ax25);
+        ax25_start_t1timer(ax25);
+}