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208 lines
4.5 KiB
208 lines
4.5 KiB
// 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 ([email protected]) |
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* Copyright (C) 2002 Ralf Baechle DO1GRB ([email protected]) |
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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/fcntl.h> |
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#include <linux/mm.h> |
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#include <linux/interrupt.h> |
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#include <net/rose.h> |
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static void rose_heartbeat_expiry(struct timer_list *t); |
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static void rose_timer_expiry(struct timer_list *); |
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static void rose_idletimer_expiry(struct timer_list *); |
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void rose_start_heartbeat(struct sock *sk) |
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{ |
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del_timer(&sk->sk_timer); |
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sk->sk_timer.function = rose_heartbeat_expiry; |
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sk->sk_timer.expires = jiffies + 5 * HZ; |
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add_timer(&sk->sk_timer); |
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} |
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void rose_start_t1timer(struct sock *sk) |
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{ |
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struct rose_sock *rose = rose_sk(sk); |
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del_timer(&rose->timer); |
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rose->timer.function = rose_timer_expiry; |
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rose->timer.expires = jiffies + rose->t1; |
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add_timer(&rose->timer); |
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} |
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void rose_start_t2timer(struct sock *sk) |
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{ |
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struct rose_sock *rose = rose_sk(sk); |
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del_timer(&rose->timer); |
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rose->timer.function = rose_timer_expiry; |
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rose->timer.expires = jiffies + rose->t2; |
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add_timer(&rose->timer); |
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} |
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void rose_start_t3timer(struct sock *sk) |
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{ |
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struct rose_sock *rose = rose_sk(sk); |
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del_timer(&rose->timer); |
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rose->timer.function = rose_timer_expiry; |
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rose->timer.expires = jiffies + rose->t3; |
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add_timer(&rose->timer); |
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} |
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void rose_start_hbtimer(struct sock *sk) |
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{ |
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struct rose_sock *rose = rose_sk(sk); |
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del_timer(&rose->timer); |
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rose->timer.function = rose_timer_expiry; |
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rose->timer.expires = jiffies + rose->hb; |
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add_timer(&rose->timer); |
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} |
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void rose_start_idletimer(struct sock *sk) |
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{ |
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struct rose_sock *rose = rose_sk(sk); |
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del_timer(&rose->idletimer); |
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if (rose->idle > 0) { |
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rose->idletimer.function = rose_idletimer_expiry; |
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rose->idletimer.expires = jiffies + rose->idle; |
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add_timer(&rose->idletimer); |
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} |
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} |
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void rose_stop_heartbeat(struct sock *sk) |
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{ |
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del_timer(&sk->sk_timer); |
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} |
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void rose_stop_timer(struct sock *sk) |
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{ |
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del_timer(&rose_sk(sk)->timer); |
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} |
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void rose_stop_idletimer(struct sock *sk) |
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{ |
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del_timer(&rose_sk(sk)->idletimer); |
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} |
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static void rose_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 rose_sock *rose = rose_sk(sk); |
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bh_lock_sock(sk); |
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switch (rose->state) { |
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case ROSE_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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bh_unlock_sock(sk); |
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rose_destroy_socket(sk); |
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return; |
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} |
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break; |
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case ROSE_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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(rose->condition & ROSE_COND_OWN_RX_BUSY)) { |
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rose->condition &= ~ROSE_COND_OWN_RX_BUSY; |
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rose->condition &= ~ROSE_COND_ACK_PENDING; |
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rose->vl = rose->vr; |
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rose_write_internal(sk, ROSE_RR); |
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rose_stop_timer(sk); /* HB */ |
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break; |
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} |
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break; |
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} |
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rose_start_heartbeat(sk); |
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bh_unlock_sock(sk); |
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} |
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static void rose_timer_expiry(struct timer_list *t) |
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{ |
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struct rose_sock *rose = from_timer(rose, t, timer); |
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struct sock *sk = &rose->sock; |
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bh_lock_sock(sk); |
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switch (rose->state) { |
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case ROSE_STATE_1: /* T1 */ |
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case ROSE_STATE_4: /* T2 */ |
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rose_write_internal(sk, ROSE_CLEAR_REQUEST); |
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rose->state = ROSE_STATE_2; |
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rose_start_t3timer(sk); |
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break; |
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case ROSE_STATE_2: /* T3 */ |
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rose->neighbour->use--; |
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rose_disconnect(sk, ETIMEDOUT, -1, -1); |
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break; |
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case ROSE_STATE_3: /* HB */ |
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if (rose->condition & ROSE_COND_ACK_PENDING) { |
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rose->condition &= ~ROSE_COND_ACK_PENDING; |
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rose_enquiry_response(sk); |
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} |
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break; |
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} |
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bh_unlock_sock(sk); |
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} |
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static void rose_idletimer_expiry(struct timer_list *t) |
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{ |
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struct rose_sock *rose = from_timer(rose, t, idletimer); |
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struct sock *sk = &rose->sock; |
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bh_lock_sock(sk); |
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rose_clear_queues(sk); |
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rose_write_internal(sk, ROSE_CLEAR_REQUEST); |
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rose_sk(sk)->state = ROSE_STATE_2; |
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rose_start_t3timer(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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