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-rw-r--r--net/rose/rose_timer.c212
1 files changed, 212 insertions, 0 deletions
diff --git a/net/rose/rose_timer.c b/net/rose/rose_timer.c
new file mode 100644
index 000000000..f06ddbed3
--- /dev/null
+++ b/net/rose/rose_timer.c
@@ -0,0 +1,212 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
+ * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
+ */
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/jiffies.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 <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <net/rose.h>
+
+static void rose_heartbeat_expiry(struct timer_list *t);
+static void rose_timer_expiry(struct timer_list *);
+static void rose_idletimer_expiry(struct timer_list *);
+
+void rose_start_heartbeat(struct sock *sk)
+{
+ sk_stop_timer(sk, &sk->sk_timer);
+
+ sk->sk_timer.function = rose_heartbeat_expiry;
+ sk->sk_timer.expires = jiffies + 5 * HZ;
+
+ sk_reset_timer(sk, &sk->sk_timer, sk->sk_timer.expires);
+}
+
+void rose_start_t1timer(struct sock *sk)
+{
+ struct rose_sock *rose = rose_sk(sk);
+
+ sk_stop_timer(sk, &rose->timer);
+
+ rose->timer.function = rose_timer_expiry;
+ rose->timer.expires = jiffies + rose->t1;
+
+ sk_reset_timer(sk, &rose->timer, rose->timer.expires);
+}
+
+void rose_start_t2timer(struct sock *sk)
+{
+ struct rose_sock *rose = rose_sk(sk);
+
+ sk_stop_timer(sk, &rose->timer);
+
+ rose->timer.function = rose_timer_expiry;
+ rose->timer.expires = jiffies + rose->t2;
+
+ sk_reset_timer(sk, &rose->timer, rose->timer.expires);
+}
+
+void rose_start_t3timer(struct sock *sk)
+{
+ struct rose_sock *rose = rose_sk(sk);
+
+ sk_stop_timer(sk, &rose->timer);
+
+ rose->timer.function = rose_timer_expiry;
+ rose->timer.expires = jiffies + rose->t3;
+
+ sk_reset_timer(sk, &rose->timer, rose->timer.expires);
+}
+
+void rose_start_hbtimer(struct sock *sk)
+{
+ struct rose_sock *rose = rose_sk(sk);
+
+ sk_stop_timer(sk, &rose->timer);
+
+ rose->timer.function = rose_timer_expiry;
+ rose->timer.expires = jiffies + rose->hb;
+
+ sk_reset_timer(sk, &rose->timer, rose->timer.expires);
+}
+
+void rose_start_idletimer(struct sock *sk)
+{
+ struct rose_sock *rose = rose_sk(sk);
+
+ sk_stop_timer(sk, &rose->idletimer);
+
+ if (rose->idle > 0) {
+ rose->idletimer.function = rose_idletimer_expiry;
+ rose->idletimer.expires = jiffies + rose->idle;
+
+ sk_reset_timer(sk, &rose->idletimer, rose->idletimer.expires);
+ }
+}
+
+void rose_stop_heartbeat(struct sock *sk)
+{
+ sk_stop_timer(sk, &sk->sk_timer);
+}
+
+void rose_stop_timer(struct sock *sk)
+{
+ sk_stop_timer(sk, &rose_sk(sk)->timer);
+}
+
+void rose_stop_idletimer(struct sock *sk)
+{
+ sk_stop_timer(sk, &rose_sk(sk)->idletimer);
+}
+
+static void rose_heartbeat_expiry(struct timer_list *t)
+{
+ struct sock *sk = from_timer(sk, t, sk_timer);
+ struct rose_sock *rose = rose_sk(sk);
+
+ bh_lock_sock(sk);
+ switch (rose->state) {
+ case ROSE_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 (sock_flag(sk, SOCK_DESTROY) ||
+ (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
+ bh_unlock_sock(sk);
+ rose_destroy_socket(sk);
+ sock_put(sk);
+ return;
+ }
+ break;
+
+ case ROSE_STATE_3:
+ /*
+ * Check for the state of the receive buffer.
+ */
+ if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
+ (rose->condition & ROSE_COND_OWN_RX_BUSY)) {
+ rose->condition &= ~ROSE_COND_OWN_RX_BUSY;
+ rose->condition &= ~ROSE_COND_ACK_PENDING;
+ rose->vl = rose->vr;
+ rose_write_internal(sk, ROSE_RR);
+ rose_stop_timer(sk); /* HB */
+ break;
+ }
+ break;
+ }
+
+ rose_start_heartbeat(sk);
+ bh_unlock_sock(sk);
+ sock_put(sk);
+}
+
+static void rose_timer_expiry(struct timer_list *t)
+{
+ struct rose_sock *rose = from_timer(rose, t, timer);
+ struct sock *sk = &rose->sock;
+
+ bh_lock_sock(sk);
+ switch (rose->state) {
+ case ROSE_STATE_1: /* T1 */
+ case ROSE_STATE_4: /* T2 */
+ rose_write_internal(sk, ROSE_CLEAR_REQUEST);
+ rose->state = ROSE_STATE_2;
+ rose_start_t3timer(sk);
+ break;
+
+ case ROSE_STATE_2: /* T3 */
+ rose->neighbour->use--;
+ rose_disconnect(sk, ETIMEDOUT, -1, -1);
+ break;
+
+ case ROSE_STATE_3: /* HB */
+ if (rose->condition & ROSE_COND_ACK_PENDING) {
+ rose->condition &= ~ROSE_COND_ACK_PENDING;
+ rose_enquiry_response(sk);
+ }
+ break;
+ }
+ bh_unlock_sock(sk);
+ sock_put(sk);
+}
+
+static void rose_idletimer_expiry(struct timer_list *t)
+{
+ struct rose_sock *rose = from_timer(rose, t, idletimer);
+ struct sock *sk = &rose->sock;
+
+ bh_lock_sock(sk);
+ rose_clear_queues(sk);
+
+ rose_write_internal(sk, ROSE_CLEAR_REQUEST);
+ rose_sk(sk)->state = ROSE_STATE_2;
+
+ rose_start_t3timer(sk);
+
+ sk->sk_state = TCP_CLOSE;
+ sk->sk_err = 0;
+ sk->sk_shutdown |= SEND_SHUTDOWN;
+
+ if (!sock_flag(sk, SOCK_DEAD)) {
+ sk->sk_state_change(sk);
+ sock_set_flag(sk, SOCK_DEAD);
+ }
+ bh_unlock_sock(sk);
+ sock_put(sk);
+}