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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
245 lines
5.2 KiB
C
245 lines
5.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
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* Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/jiffies.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <net/ax25.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/tcp_states.h>
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#include <linux/uaccess.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <net/netrom.h>
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static void nr_heartbeat_expiry(struct timer_list *);
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static void nr_t1timer_expiry(struct timer_list *);
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static void nr_t2timer_expiry(struct timer_list *);
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static void nr_t4timer_expiry(struct timer_list *);
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static void nr_idletimer_expiry(struct timer_list *);
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void nr_init_timers(struct sock *sk)
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{
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struct nr_sock *nr = nr_sk(sk);
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timer_setup(&nr->t1timer, nr_t1timer_expiry, 0);
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timer_setup(&nr->t2timer, nr_t2timer_expiry, 0);
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timer_setup(&nr->t4timer, nr_t4timer_expiry, 0);
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timer_setup(&nr->idletimer, nr_idletimer_expiry, 0);
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/* initialized by sock_init_data */
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sk->sk_timer.function = nr_heartbeat_expiry;
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}
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void nr_start_t1timer(struct sock *sk)
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{
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struct nr_sock *nr = nr_sk(sk);
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sk_reset_timer(sk, &nr->t1timer, jiffies + nr->t1);
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}
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void nr_start_t2timer(struct sock *sk)
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{
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struct nr_sock *nr = nr_sk(sk);
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sk_reset_timer(sk, &nr->t2timer, jiffies + nr->t2);
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}
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void nr_start_t4timer(struct sock *sk)
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{
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struct nr_sock *nr = nr_sk(sk);
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sk_reset_timer(sk, &nr->t4timer, jiffies + nr->t4);
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}
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void nr_start_idletimer(struct sock *sk)
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{
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struct nr_sock *nr = nr_sk(sk);
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if (nr->idle > 0)
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sk_reset_timer(sk, &nr->idletimer, jiffies + nr->idle);
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}
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void nr_start_heartbeat(struct sock *sk)
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{
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sk_reset_timer(sk, &sk->sk_timer, jiffies + 5 * HZ);
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}
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void nr_stop_t1timer(struct sock *sk)
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{
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sk_stop_timer(sk, &nr_sk(sk)->t1timer);
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}
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void nr_stop_t2timer(struct sock *sk)
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{
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sk_stop_timer(sk, &nr_sk(sk)->t2timer);
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}
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void nr_stop_t4timer(struct sock *sk)
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{
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sk_stop_timer(sk, &nr_sk(sk)->t4timer);
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}
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void nr_stop_idletimer(struct sock *sk)
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{
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sk_stop_timer(sk, &nr_sk(sk)->idletimer);
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}
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void nr_stop_heartbeat(struct sock *sk)
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{
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sk_stop_timer(sk, &sk->sk_timer);
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}
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int nr_t1timer_running(struct sock *sk)
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{
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return timer_pending(&nr_sk(sk)->t1timer);
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}
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static void nr_heartbeat_expiry(struct timer_list *t)
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{
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struct sock *sk = from_timer(sk, t, sk_timer);
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struct nr_sock *nr = nr_sk(sk);
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bh_lock_sock(sk);
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switch (nr->state) {
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case NR_STATE_0:
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/* Magic here: If we listen() and a new link dies before it
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is accepted() it isn't 'dead' so doesn't get removed. */
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if (sock_flag(sk, SOCK_DESTROY) ||
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(sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
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sock_hold(sk);
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bh_unlock_sock(sk);
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nr_destroy_socket(sk);
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sock_put(sk);
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return;
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}
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break;
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case NR_STATE_3:
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/*
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* Check for the state of the receive buffer.
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*/
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if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
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(nr->condition & NR_COND_OWN_RX_BUSY)) {
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nr->condition &= ~NR_COND_OWN_RX_BUSY;
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nr->condition &= ~NR_COND_ACK_PENDING;
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nr->vl = nr->vr;
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nr_write_internal(sk, NR_INFOACK);
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break;
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}
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break;
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}
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nr_start_heartbeat(sk);
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bh_unlock_sock(sk);
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}
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static void nr_t2timer_expiry(struct timer_list *t)
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{
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struct nr_sock *nr = from_timer(nr, t, t2timer);
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struct sock *sk = &nr->sock;
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bh_lock_sock(sk);
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if (nr->condition & NR_COND_ACK_PENDING) {
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nr->condition &= ~NR_COND_ACK_PENDING;
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nr_enquiry_response(sk);
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}
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bh_unlock_sock(sk);
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}
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static void nr_t4timer_expiry(struct timer_list *t)
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{
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struct nr_sock *nr = from_timer(nr, t, t4timer);
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struct sock *sk = &nr->sock;
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bh_lock_sock(sk);
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nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
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bh_unlock_sock(sk);
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}
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static void nr_idletimer_expiry(struct timer_list *t)
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{
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struct nr_sock *nr = from_timer(nr, t, idletimer);
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struct sock *sk = &nr->sock;
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bh_lock_sock(sk);
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nr_clear_queues(sk);
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nr->n2count = 0;
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nr_write_internal(sk, NR_DISCREQ);
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nr->state = NR_STATE_2;
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nr_start_t1timer(sk);
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nr_stop_t2timer(sk);
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nr_stop_t4timer(sk);
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sk->sk_state = TCP_CLOSE;
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sk->sk_err = 0;
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sk->sk_shutdown |= SEND_SHUTDOWN;
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if (!sock_flag(sk, SOCK_DEAD)) {
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sk->sk_state_change(sk);
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sock_set_flag(sk, SOCK_DEAD);
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}
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bh_unlock_sock(sk);
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}
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static void nr_t1timer_expiry(struct timer_list *t)
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{
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struct nr_sock *nr = from_timer(nr, t, t1timer);
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struct sock *sk = &nr->sock;
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bh_lock_sock(sk);
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switch (nr->state) {
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case NR_STATE_1:
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if (nr->n2count == nr->n2) {
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nr_disconnect(sk, ETIMEDOUT);
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bh_unlock_sock(sk);
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return;
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} else {
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nr->n2count++;
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nr_write_internal(sk, NR_CONNREQ);
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}
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break;
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case NR_STATE_2:
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if (nr->n2count == nr->n2) {
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nr_disconnect(sk, ETIMEDOUT);
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bh_unlock_sock(sk);
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return;
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} else {
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nr->n2count++;
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nr_write_internal(sk, NR_DISCREQ);
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}
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break;
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case NR_STATE_3:
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if (nr->n2count == nr->n2) {
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nr_disconnect(sk, ETIMEDOUT);
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bh_unlock_sock(sk);
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return;
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} else {
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nr->n2count++;
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nr_requeue_frames(sk);
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}
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break;
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}
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nr_start_t1timer(sk);
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bh_unlock_sock(sk);
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}
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