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-rw-r--r--net/netrom/nr_timer.c248
1 files changed, 248 insertions, 0 deletions
diff --git a/net/netrom/nr_timer.c b/net/netrom/nr_timer.c
new file mode 100644
index 000000000..4e7c968cd
--- /dev/null
+++ b/net/netrom/nr_timer.c
@@ -0,0 +1,248 @@
+// 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/uaccess.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <net/netrom.h>
+
+static void nr_heartbeat_expiry(struct timer_list *);
+static void nr_t1timer_expiry(struct timer_list *);
+static void nr_t2timer_expiry(struct timer_list *);
+static void nr_t4timer_expiry(struct timer_list *);
+static void nr_idletimer_expiry(struct timer_list *);
+
+void nr_init_timers(struct sock *sk)
+{
+ struct nr_sock *nr = nr_sk(sk);
+
+ timer_setup(&nr->t1timer, nr_t1timer_expiry, 0);
+ timer_setup(&nr->t2timer, nr_t2timer_expiry, 0);
+ timer_setup(&nr->t4timer, nr_t4timer_expiry, 0);
+ timer_setup(&nr->idletimer, nr_idletimer_expiry, 0);
+
+ /* initialized by sock_init_data */
+ sk->sk_timer.function = nr_heartbeat_expiry;
+}
+
+void nr_start_t1timer(struct sock *sk)
+{
+ struct nr_sock *nr = nr_sk(sk);
+
+ sk_reset_timer(sk, &nr->t1timer, jiffies + nr->t1);
+}
+
+void nr_start_t2timer(struct sock *sk)
+{
+ struct nr_sock *nr = nr_sk(sk);
+
+ sk_reset_timer(sk, &nr->t2timer, jiffies + nr->t2);
+}
+
+void nr_start_t4timer(struct sock *sk)
+{
+ struct nr_sock *nr = nr_sk(sk);
+
+ sk_reset_timer(sk, &nr->t4timer, jiffies + nr->t4);
+}
+
+void nr_start_idletimer(struct sock *sk)
+{
+ struct nr_sock *nr = nr_sk(sk);
+
+ if (nr->idle > 0)
+ sk_reset_timer(sk, &nr->idletimer, jiffies + nr->idle);
+}
+
+void nr_start_heartbeat(struct sock *sk)
+{
+ sk_reset_timer(sk, &sk->sk_timer, jiffies + 5 * HZ);
+}
+
+void nr_stop_t1timer(struct sock *sk)
+{
+ sk_stop_timer(sk, &nr_sk(sk)->t1timer);
+}
+
+void nr_stop_t2timer(struct sock *sk)
+{
+ sk_stop_timer(sk, &nr_sk(sk)->t2timer);
+}
+
+void nr_stop_t4timer(struct sock *sk)
+{
+ sk_stop_timer(sk, &nr_sk(sk)->t4timer);
+}
+
+void nr_stop_idletimer(struct sock *sk)
+{
+ sk_stop_timer(sk, &nr_sk(sk)->idletimer);
+}
+
+void nr_stop_heartbeat(struct sock *sk)
+{
+ sk_stop_timer(sk, &sk->sk_timer);
+}
+
+int nr_t1timer_running(struct sock *sk)
+{
+ return timer_pending(&nr_sk(sk)->t1timer);
+}
+
+static void nr_heartbeat_expiry(struct timer_list *t)
+{
+ struct sock *sk = from_timer(sk, t, sk_timer);
+ struct nr_sock *nr = nr_sk(sk);
+
+ bh_lock_sock(sk);
+ switch (nr->state) {
+ case NR_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))) {
+ sock_hold(sk);
+ bh_unlock_sock(sk);
+ nr_destroy_socket(sk);
+ goto out;
+ }
+ break;
+
+ case NR_STATE_3:
+ /*
+ * Check for the state of the receive buffer.
+ */
+ if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
+ (nr->condition & NR_COND_OWN_RX_BUSY)) {
+ nr->condition &= ~NR_COND_OWN_RX_BUSY;
+ nr->condition &= ~NR_COND_ACK_PENDING;
+ nr->vl = nr->vr;
+ nr_write_internal(sk, NR_INFOACK);
+ break;
+ }
+ break;
+ }
+
+ nr_start_heartbeat(sk);
+ bh_unlock_sock(sk);
+out:
+ sock_put(sk);
+}
+
+static void nr_t2timer_expiry(struct timer_list *t)
+{
+ struct nr_sock *nr = from_timer(nr, t, t2timer);
+ struct sock *sk = &nr->sock;
+
+ bh_lock_sock(sk);
+ if (nr->condition & NR_COND_ACK_PENDING) {
+ nr->condition &= ~NR_COND_ACK_PENDING;
+ nr_enquiry_response(sk);
+ }
+ bh_unlock_sock(sk);
+ sock_put(sk);
+}
+
+static void nr_t4timer_expiry(struct timer_list *t)
+{
+ struct nr_sock *nr = from_timer(nr, t, t4timer);
+ struct sock *sk = &nr->sock;
+
+ bh_lock_sock(sk);
+ nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
+ bh_unlock_sock(sk);
+ sock_put(sk);
+}
+
+static void nr_idletimer_expiry(struct timer_list *t)
+{
+ struct nr_sock *nr = from_timer(nr, t, idletimer);
+ struct sock *sk = &nr->sock;
+
+ bh_lock_sock(sk);
+
+ nr_clear_queues(sk);
+
+ nr->n2count = 0;
+ nr_write_internal(sk, NR_DISCREQ);
+ nr->state = NR_STATE_2;
+
+ nr_start_t1timer(sk);
+ nr_stop_t2timer(sk);
+ nr_stop_t4timer(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);
+}
+
+static void nr_t1timer_expiry(struct timer_list *t)
+{
+ struct nr_sock *nr = from_timer(nr, t, t1timer);
+ struct sock *sk = &nr->sock;
+
+ bh_lock_sock(sk);
+ switch (nr->state) {
+ case NR_STATE_1:
+ if (nr->n2count == nr->n2) {
+ nr_disconnect(sk, ETIMEDOUT);
+ goto out;
+ } else {
+ nr->n2count++;
+ nr_write_internal(sk, NR_CONNREQ);
+ }
+ break;
+
+ case NR_STATE_2:
+ if (nr->n2count == nr->n2) {
+ nr_disconnect(sk, ETIMEDOUT);
+ goto out;
+ } else {
+ nr->n2count++;
+ nr_write_internal(sk, NR_DISCREQ);
+ }
+ break;
+
+ case NR_STATE_3:
+ if (nr->n2count == nr->n2) {
+ nr_disconnect(sk, ETIMEDOUT);
+ goto out;
+ } else {
+ nr->n2count++;
+ nr_requeue_frames(sk);
+ }
+ break;
+ }
+
+ nr_start_t1timer(sk);
+out:
+ bh_unlock_sock(sk);
+ sock_put(sk);
+}