Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ax25 / ax25_std_timer.c

diff --git a/kernel/net/ax25/ax25_std_timer.c b/kernel/net/ax25/ax25_std_timer.c
new file mode 100644 (file)
index 0000000..004467c
--- /dev/null
+++ b/kernel/net/ax25/ax25_std_timer.c
@@ -0,0 +1,175 @@
+/*
+ * 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/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_states.h>
+#include <asm/uaccess.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 >> 1) &&
+                           (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);
+}