Commit | Line | Data |
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1da177e4 LT |
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 | |
f8e1d201 | 6 | * screw up. It might even work. |
1da177e4 LT |
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> | |
c752f073 | 26 | #include <net/tcp_states.h> |
1da177e4 LT |
27 | #include <net/x25.h> |
28 | ||
99767f27 KC |
29 | static void x25_heartbeat_expiry(struct timer_list *t); |
30 | static void x25_timer_expiry(struct timer_list *t); | |
1da177e4 LT |
31 | |
32 | void x25_init_timers(struct sock *sk) | |
33 | { | |
34 | struct x25_sock *x25 = x25_sk(sk); | |
35 | ||
99767f27 | 36 | timer_setup(&x25->timer, x25_timer_expiry, 0); |
1da177e4 LT |
37 | |
38 | /* initialized by sock_init_data */ | |
841b86f3 | 39 | sk->sk_timer.function = x25_heartbeat_expiry; |
1da177e4 LT |
40 | } |
41 | ||
42 | void x25_start_heartbeat(struct sock *sk) | |
43 | { | |
44 | mod_timer(&sk->sk_timer, jiffies + 5 * HZ); | |
45 | } | |
46 | ||
47 | void x25_stop_heartbeat(struct sock *sk) | |
48 | { | |
49 | del_timer(&sk->sk_timer); | |
50 | } | |
51 | ||
52 | void x25_start_t2timer(struct sock *sk) | |
53 | { | |
54 | struct x25_sock *x25 = x25_sk(sk); | |
55 | ||
56 | mod_timer(&x25->timer, jiffies + x25->t2); | |
57 | } | |
58 | ||
59 | void x25_start_t21timer(struct sock *sk) | |
60 | { | |
61 | struct x25_sock *x25 = x25_sk(sk); | |
62 | ||
63 | mod_timer(&x25->timer, jiffies + x25->t21); | |
64 | } | |
65 | ||
66 | void x25_start_t22timer(struct sock *sk) | |
67 | { | |
68 | struct x25_sock *x25 = x25_sk(sk); | |
69 | ||
70 | mod_timer(&x25->timer, jiffies + x25->t22); | |
71 | } | |
72 | ||
73 | void x25_start_t23timer(struct sock *sk) | |
74 | { | |
75 | struct x25_sock *x25 = x25_sk(sk); | |
76 | ||
77 | mod_timer(&x25->timer, jiffies + x25->t23); | |
78 | } | |
79 | ||
80 | void x25_stop_timer(struct sock *sk) | |
81 | { | |
82 | del_timer(&x25_sk(sk)->timer); | |
83 | } | |
84 | ||
85 | unsigned long x25_display_timer(struct sock *sk) | |
86 | { | |
87 | struct x25_sock *x25 = x25_sk(sk); | |
88 | ||
89 | if (!timer_pending(&x25->timer)) | |
90 | return 0; | |
91 | ||
92 | return x25->timer.expires - jiffies; | |
93 | } | |
94 | ||
99767f27 | 95 | static void x25_heartbeat_expiry(struct timer_list *t) |
1da177e4 | 96 | { |
99767f27 | 97 | struct sock *sk = from_timer(sk, t, sk_timer); |
1da177e4 | 98 | |
f8e1d201 YH |
99 | bh_lock_sock(sk); |
100 | if (sock_owned_by_user(sk)) /* can currently only occur in state 3 */ | |
1da177e4 LT |
101 | goto restart_heartbeat; |
102 | ||
103 | switch (x25_sk(sk)->state) { | |
104 | ||
105 | case X25_STATE_0: | |
106 | /* | |
107 | * Magic here: If we listen() and a new link dies | |
108 | * before it is accepted() it isn't 'dead' so doesn't | |
109 | * get removed. | |
110 | */ | |
111 | if (sock_flag(sk, SOCK_DESTROY) || | |
112 | (sk->sk_state == TCP_LISTEN && | |
113 | sock_flag(sk, SOCK_DEAD))) { | |
43dff98b | 114 | bh_unlock_sock(sk); |
14ebaf81 | 115 | x25_destroy_socket_from_timer(sk); |
43dff98b | 116 | return; |
1da177e4 LT |
117 | } |
118 | break; | |
119 | ||
120 | case X25_STATE_3: | |
121 | /* | |
122 | * Check for the state of the receive buffer. | |
123 | */ | |
124 | x25_check_rbuf(sk); | |
125 | break; | |
126 | } | |
127 | restart_heartbeat: | |
128 | x25_start_heartbeat(sk); | |
1da177e4 LT |
129 | bh_unlock_sock(sk); |
130 | } | |
131 | ||
132 | /* | |
133 | * Timer has expired, it may have been T2, T21, T22, or T23. We can tell | |
134 | * by the state machine state. | |
135 | */ | |
136 | static inline void x25_do_timer_expiry(struct sock * sk) | |
137 | { | |
138 | struct x25_sock *x25 = x25_sk(sk); | |
139 | ||
140 | switch (x25->state) { | |
141 | ||
142 | case X25_STATE_3: /* T2 */ | |
143 | if (x25->condition & X25_COND_ACK_PENDING) { | |
144 | x25->condition &= ~X25_COND_ACK_PENDING; | |
145 | x25_enquiry_response(sk); | |
146 | } | |
147 | break; | |
148 | ||
149 | case X25_STATE_1: /* T21 */ | |
150 | case X25_STATE_4: /* T22 */ | |
151 | x25_write_internal(sk, X25_CLEAR_REQUEST); | |
152 | x25->state = X25_STATE_2; | |
153 | x25_start_t23timer(sk); | |
154 | break; | |
155 | ||
156 | case X25_STATE_2: /* T23 */ | |
157 | x25_disconnect(sk, ETIMEDOUT, 0, 0); | |
158 | break; | |
159 | } | |
160 | } | |
161 | ||
99767f27 | 162 | static void x25_timer_expiry(struct timer_list *t) |
1da177e4 | 163 | { |
99767f27 KC |
164 | struct x25_sock *x25 = from_timer(x25, t, timer); |
165 | struct sock *sk = &x25->sk; | |
1da177e4 LT |
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 | } |