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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /net/ax25/ax25_std_timer.c
Initial import
Diffstat (limited to 'net/ax25/ax25_std_timer.c')
-rw-r--r--net/ax25/ax25_std_timer.c175
1 files changed, 175 insertions, 0 deletions
diff --git a/net/ax25/ax25_std_timer.c b/net/ax25/ax25_std_timer.c
new file mode 100644
index 000000000..004467c9e
--- /dev/null
+++ b/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);
+}