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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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