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Linux/net/x25/x25_timer.c

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  1 /*
  2  *      X.25 Packet Layer release 002
  3  *
  4  *      This is ALPHA test software. This code may break your machine,
  5  *      randomly fail to work with new releases, misbehave and/or generally
  6  *      screw up. It might even work.
  7  *
  8  *      This code REQUIRES 2.1.15 or higher
  9  *
 10  *      This module:
 11  *              This module is free software; you can redistribute it and/or
 12  *              modify it under the terms of the GNU General Public License
 13  *              as published by the Free Software Foundation; either version
 14  *              2 of the License, or (at your option) any later version.
 15  *
 16  *      History
 17  *      X.25 001        Jonathan Naylor Started coding.
 18  *      X.25 002        Jonathan Naylor New timer architecture.
 19  *                                      Centralised disconnection processing.
 20  */
 21 
 22 #include <linux/errno.h>
 23 #include <linux/jiffies.h>
 24 #include <linux/timer.h>
 25 #include <net/sock.h>
 26 #include <net/tcp_states.h>
 27 #include <net/x25.h>
 28 
 29 static void x25_heartbeat_expiry(unsigned long);
 30 static void x25_timer_expiry(unsigned long);
 31 
 32 void x25_init_timers(struct sock *sk)
 33 {
 34         struct x25_sock *x25 = x25_sk(sk);
 35 
 36         setup_timer(&x25->timer, x25_timer_expiry, (unsigned long)sk);
 37 
 38         /* initialized by sock_init_data */
 39         sk->sk_timer.data     = (unsigned long)sk;
 40         sk->sk_timer.function = &x25_heartbeat_expiry;
 41 }
 42 
 43 void x25_start_heartbeat(struct sock *sk)
 44 {
 45         mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
 46 }
 47 
 48 void x25_stop_heartbeat(struct sock *sk)
 49 {
 50         del_timer(&sk->sk_timer);
 51 }
 52 
 53 void x25_start_t2timer(struct sock *sk)
 54 {
 55         struct x25_sock *x25 = x25_sk(sk);
 56 
 57         mod_timer(&x25->timer, jiffies + x25->t2);
 58 }
 59 
 60 void x25_start_t21timer(struct sock *sk)
 61 {
 62         struct x25_sock *x25 = x25_sk(sk);
 63 
 64         mod_timer(&x25->timer, jiffies + x25->t21);
 65 }
 66 
 67 void x25_start_t22timer(struct sock *sk)
 68 {
 69         struct x25_sock *x25 = x25_sk(sk);
 70 
 71         mod_timer(&x25->timer, jiffies + x25->t22);
 72 }
 73 
 74 void x25_start_t23timer(struct sock *sk)
 75 {
 76         struct x25_sock *x25 = x25_sk(sk);
 77 
 78         mod_timer(&x25->timer, jiffies + x25->t23);
 79 }
 80 
 81 void x25_stop_timer(struct sock *sk)
 82 {
 83         del_timer(&x25_sk(sk)->timer);
 84 }
 85 
 86 unsigned long x25_display_timer(struct sock *sk)
 87 {
 88         struct x25_sock *x25 = x25_sk(sk);
 89 
 90         if (!timer_pending(&x25->timer))
 91                 return 0;
 92 
 93         return x25->timer.expires - jiffies;
 94 }
 95 
 96 static void x25_heartbeat_expiry(unsigned long param)
 97 {
 98         struct sock *sk = (struct sock *)param;
 99 
100         bh_lock_sock(sk);
101         if (sock_owned_by_user(sk)) /* can currently only occur in state 3 */
102                 goto restart_heartbeat;
103 
104         switch (x25_sk(sk)->state) {
105 
106                 case X25_STATE_0:
107                         /*
108                          * Magic here: If we listen() and a new link dies
109                          * before it is accepted() it isn't 'dead' so doesn't
110                          * get removed.
111                          */
112                         if (sock_flag(sk, SOCK_DESTROY) ||
113                             (sk->sk_state == TCP_LISTEN &&
114                              sock_flag(sk, SOCK_DEAD))) {
115                                 bh_unlock_sock(sk);
116                                 x25_destroy_socket_from_timer(sk);
117                                 return;
118                         }
119                         break;
120 
121                 case X25_STATE_3:
122                         /*
123                          * Check for the state of the receive buffer.
124                          */
125                         x25_check_rbuf(sk);
126                         break;
127         }
128 restart_heartbeat:
129         x25_start_heartbeat(sk);
130         bh_unlock_sock(sk);
131 }
132 
133 /*
134  *      Timer has expired, it may have been T2, T21, T22, or T23. We can tell
135  *      by the state machine state.
136  */
137 static inline void x25_do_timer_expiry(struct sock * sk)
138 {
139         struct x25_sock *x25 = x25_sk(sk);
140 
141         switch (x25->state) {
142 
143                 case X25_STATE_3:       /* T2 */
144                         if (x25->condition & X25_COND_ACK_PENDING) {
145                                 x25->condition &= ~X25_COND_ACK_PENDING;
146                                 x25_enquiry_response(sk);
147                         }
148                         break;
149 
150                 case X25_STATE_1:       /* T21 */
151                 case X25_STATE_4:       /* T22 */
152                         x25_write_internal(sk, X25_CLEAR_REQUEST);
153                         x25->state = X25_STATE_2;
154                         x25_start_t23timer(sk);
155                         break;
156 
157                 case X25_STATE_2:       /* T23 */
158                         x25_disconnect(sk, ETIMEDOUT, 0, 0);
159                         break;
160         }
161 }
162 
163 static void x25_timer_expiry(unsigned long param)
164 {
165         struct sock *sk = (struct sock *)param;
166 
167         bh_lock_sock(sk);
168         if (sock_owned_by_user(sk)) { /* can currently only occur in state 3 */
169                 if (x25_sk(sk)->state == X25_STATE_3)
170                         x25_start_t2timer(sk);
171         } else
172                 x25_do_timer_expiry(sk);
173         bh_unlock_sock(sk);
174 }
175 

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