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 | |
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.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 | init_timer(&x25->timer); | |
37 | x25->timer.data = (unsigned long)sk; | |
38 | x25->timer.function = &x25_timer_expiry; | |
39 | ||
40 | /* initialized by sock_init_data */ | |
41 | sk->sk_timer.data = (unsigned long)sk; | |
42 | sk->sk_timer.function = &x25_heartbeat_expiry; | |
43 | } | |
44 | ||
45 | void x25_start_heartbeat(struct sock *sk) | |
46 | { | |
47 | mod_timer(&sk->sk_timer, jiffies + 5 * HZ); | |
48 | } | |
49 | ||
50 | void x25_stop_heartbeat(struct sock *sk) | |
51 | { | |
52 | del_timer(&sk->sk_timer); | |
53 | } | |
54 | ||
55 | void x25_start_t2timer(struct sock *sk) | |
56 | { | |
57 | struct x25_sock *x25 = x25_sk(sk); | |
58 | ||
59 | mod_timer(&x25->timer, jiffies + x25->t2); | |
60 | } | |
61 | ||
62 | void x25_start_t21timer(struct sock *sk) | |
63 | { | |
64 | struct x25_sock *x25 = x25_sk(sk); | |
65 | ||
66 | mod_timer(&x25->timer, jiffies + x25->t21); | |
67 | } | |
68 | ||
69 | void x25_start_t22timer(struct sock *sk) | |
70 | { | |
71 | struct x25_sock *x25 = x25_sk(sk); | |
72 | ||
73 | mod_timer(&x25->timer, jiffies + x25->t22); | |
74 | } | |
75 | ||
76 | void x25_start_t23timer(struct sock *sk) | |
77 | { | |
78 | struct x25_sock *x25 = x25_sk(sk); | |
79 | ||
80 | mod_timer(&x25->timer, jiffies + x25->t23); | |
81 | } | |
82 | ||
83 | void x25_stop_timer(struct sock *sk) | |
84 | { | |
85 | del_timer(&x25_sk(sk)->timer); | |
86 | } | |
87 | ||
88 | unsigned long x25_display_timer(struct sock *sk) | |
89 | { | |
90 | struct x25_sock *x25 = x25_sk(sk); | |
91 | ||
92 | if (!timer_pending(&x25->timer)) | |
93 | return 0; | |
94 | ||
95 | return x25->timer.expires - jiffies; | |
96 | } | |
97 | ||
98 | static void x25_heartbeat_expiry(unsigned long param) | |
99 | { | |
100 | struct sock *sk = (struct sock *)param; | |
101 | ||
102 | bh_lock_sock(sk); | |
103 | if (sock_owned_by_user(sk)) /* can currently only occur in state 3 */ | |
104 | goto restart_heartbeat; | |
105 | ||
106 | switch (x25_sk(sk)->state) { | |
107 | ||
108 | case X25_STATE_0: | |
109 | /* | |
110 | * Magic here: If we listen() and a new link dies | |
111 | * before it is accepted() it isn't 'dead' so doesn't | |
112 | * get removed. | |
113 | */ | |
114 | if (sock_flag(sk, SOCK_DESTROY) || | |
115 | (sk->sk_state == TCP_LISTEN && | |
116 | sock_flag(sk, SOCK_DEAD))) { | |
117 | x25_destroy_socket(sk); | |
118 | goto unlock; | |
119 | } | |
120 | break; | |
121 | ||
122 | case X25_STATE_3: | |
123 | /* | |
124 | * Check for the state of the receive buffer. | |
125 | */ | |
126 | x25_check_rbuf(sk); | |
127 | break; | |
128 | } | |
129 | restart_heartbeat: | |
130 | x25_start_heartbeat(sk); | |
131 | unlock: | |
132 | bh_unlock_sock(sk); | |
133 | } | |
134 | ||
135 | /* | |
136 | * Timer has expired, it may have been T2, T21, T22, or T23. We can tell | |
137 | * by the state machine state. | |
138 | */ | |
139 | static inline void x25_do_timer_expiry(struct sock * sk) | |
140 | { | |
141 | struct x25_sock *x25 = x25_sk(sk); | |
142 | ||
143 | switch (x25->state) { | |
144 | ||
145 | case X25_STATE_3: /* T2 */ | |
146 | if (x25->condition & X25_COND_ACK_PENDING) { | |
147 | x25->condition &= ~X25_COND_ACK_PENDING; | |
148 | x25_enquiry_response(sk); | |
149 | } | |
150 | break; | |
151 | ||
152 | case X25_STATE_1: /* T21 */ | |
153 | case X25_STATE_4: /* T22 */ | |
154 | x25_write_internal(sk, X25_CLEAR_REQUEST); | |
155 | x25->state = X25_STATE_2; | |
156 | x25_start_t23timer(sk); | |
157 | break; | |
158 | ||
159 | case X25_STATE_2: /* T23 */ | |
160 | x25_disconnect(sk, ETIMEDOUT, 0, 0); | |
161 | break; | |
162 | } | |
163 | } | |
164 | ||
165 | static void x25_timer_expiry(unsigned long param) | |
166 | { | |
167 | struct sock *sk = (struct sock *)param; | |
168 | ||
169 | bh_lock_sock(sk); | |
170 | if (sock_owned_by_user(sk)) { /* can currently only occur in state 3 */ | |
171 | if (x25_sk(sk)->state == X25_STATE_3) | |
172 | x25_start_t2timer(sk); | |
173 | } else | |
174 | x25_do_timer_expiry(sk); | |
175 | bh_unlock_sock(sk); | |
176 | } |