2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
10 #include <linux/errno.h>
11 #include <linux/types.h>
12 #include <linux/socket.h>
14 #include <linux/kernel.h>
15 #include <linux/jiffies.h>
16 #include <linux/timer.h>
17 #include <linux/string.h>
18 #include <linux/sockios.h>
19 #include <linux/net.h>
21 #include <linux/inet.h>
22 #include <linux/netdevice.h>
23 #include <linux/skbuff.h>
25 #include <net/tcp_states.h>
26 #include <linux/uaccess.h>
27 #include <linux/fcntl.h>
29 #include <linux/interrupt.h>
30 #include <net/netrom.h>
32 static void nr_heartbeat_expiry(unsigned long);
33 static void nr_t1timer_expiry(unsigned long);
34 static void nr_t2timer_expiry(unsigned long);
35 static void nr_t4timer_expiry(unsigned long);
36 static void nr_idletimer_expiry(unsigned long);
38 void nr_init_timers(struct sock *sk)
40 struct nr_sock *nr = nr_sk(sk);
42 setup_timer(&nr->t1timer, nr_t1timer_expiry, (unsigned long)sk);
43 setup_timer(&nr->t2timer, nr_t2timer_expiry, (unsigned long)sk);
44 setup_timer(&nr->t4timer, nr_t4timer_expiry, (unsigned long)sk);
45 setup_timer(&nr->idletimer, nr_idletimer_expiry, (unsigned long)sk);
47 /* initialized by sock_init_data */
48 sk->sk_timer.data = (unsigned long)sk;
49 sk->sk_timer.function = &nr_heartbeat_expiry;
52 void nr_start_t1timer(struct sock *sk)
54 struct nr_sock *nr = nr_sk(sk);
56 sk_reset_timer(sk, &nr->t1timer, jiffies + nr->t1);
59 void nr_start_t2timer(struct sock *sk)
61 struct nr_sock *nr = nr_sk(sk);
63 sk_reset_timer(sk, &nr->t2timer, jiffies + nr->t2);
66 void nr_start_t4timer(struct sock *sk)
68 struct nr_sock *nr = nr_sk(sk);
70 sk_reset_timer(sk, &nr->t4timer, jiffies + nr->t4);
73 void nr_start_idletimer(struct sock *sk)
75 struct nr_sock *nr = nr_sk(sk);
78 sk_reset_timer(sk, &nr->idletimer, jiffies + nr->idle);
81 void nr_start_heartbeat(struct sock *sk)
83 sk_reset_timer(sk, &sk->sk_timer, jiffies + 5 * HZ);
86 void nr_stop_t1timer(struct sock *sk)
88 sk_stop_timer(sk, &nr_sk(sk)->t1timer);
91 void nr_stop_t2timer(struct sock *sk)
93 sk_stop_timer(sk, &nr_sk(sk)->t2timer);
96 void nr_stop_t4timer(struct sock *sk)
98 sk_stop_timer(sk, &nr_sk(sk)->t4timer);
101 void nr_stop_idletimer(struct sock *sk)
103 sk_stop_timer(sk, &nr_sk(sk)->idletimer);
106 void nr_stop_heartbeat(struct sock *sk)
108 sk_stop_timer(sk, &sk->sk_timer);
111 int nr_t1timer_running(struct sock *sk)
113 return timer_pending(&nr_sk(sk)->t1timer);
116 static void nr_heartbeat_expiry(unsigned long param)
118 struct sock *sk = (struct sock *)param;
119 struct nr_sock *nr = nr_sk(sk);
124 /* Magic here: If we listen() and a new link dies before it
125 is accepted() it isn't 'dead' so doesn't get removed. */
126 if (sock_flag(sk, SOCK_DESTROY) ||
127 (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
130 nr_destroy_socket(sk);
137 * Check for the state of the receive buffer.
139 if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
140 (nr->condition & NR_COND_OWN_RX_BUSY)) {
141 nr->condition &= ~NR_COND_OWN_RX_BUSY;
142 nr->condition &= ~NR_COND_ACK_PENDING;
144 nr_write_internal(sk, NR_INFOACK);
150 nr_start_heartbeat(sk);
156 static void nr_t2timer_expiry(unsigned long param)
158 struct sock *sk = (struct sock *)param;
159 struct nr_sock *nr = nr_sk(sk);
162 if (nr->condition & NR_COND_ACK_PENDING) {
163 nr->condition &= ~NR_COND_ACK_PENDING;
164 nr_enquiry_response(sk);
170 static void nr_t4timer_expiry(unsigned long param)
172 struct sock *sk = (struct sock *)param;
175 nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
180 static void nr_idletimer_expiry(unsigned long param)
182 struct sock *sk = (struct sock *)param;
183 struct nr_sock *nr = nr_sk(sk);
190 nr_write_internal(sk, NR_DISCREQ);
191 nr->state = NR_STATE_2;
193 nr_start_t1timer(sk);
197 sk->sk_state = TCP_CLOSE;
199 sk->sk_shutdown |= SEND_SHUTDOWN;
201 if (!sock_flag(sk, SOCK_DEAD)) {
202 sk->sk_state_change(sk);
203 sock_set_flag(sk, SOCK_DEAD);
209 static void nr_t1timer_expiry(unsigned long param)
211 struct sock *sk = (struct sock *)param;
212 struct nr_sock *nr = nr_sk(sk);
217 if (nr->n2count == nr->n2) {
218 nr_disconnect(sk, ETIMEDOUT);
222 nr_write_internal(sk, NR_CONNREQ);
227 if (nr->n2count == nr->n2) {
228 nr_disconnect(sk, ETIMEDOUT);
232 nr_write_internal(sk, NR_DISCREQ);
237 if (nr->n2count == nr->n2) {
238 nr_disconnect(sk, ETIMEDOUT);
242 nr_requeue_frames(sk);
247 nr_start_t1timer(sk);