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1da177e4 LT |
1 | /* |
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. | |
6 | * | |
7 | * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) | |
8 | * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) | |
9 | * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de) | |
10 | * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr) | |
11 | */ | |
12 | #include <linux/errno.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/socket.h> | |
15 | #include <linux/in.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/timer.h> | |
19 | #include <linux/string.h> | |
20 | #include <linux/sockios.h> | |
21 | #include <linux/net.h> | |
22 | #include <net/ax25.h> | |
23 | #include <linux/inet.h> | |
24 | #include <linux/netdevice.h> | |
25 | #include <linux/skbuff.h> | |
26 | #include <net/sock.h> | |
c752f073 | 27 | #include <net/tcp_states.h> |
1da177e4 LT |
28 | #include <asm/uaccess.h> |
29 | #include <asm/system.h> | |
30 | #include <linux/fcntl.h> | |
31 | #include <linux/mm.h> | |
32 | #include <linux/interrupt.h> | |
33 | ||
34 | void ax25_std_heartbeat_expiry(ax25_cb *ax25) | |
35 | { | |
36 | struct sock *sk=ax25->sk; | |
528930b9 | 37 | |
1da177e4 LT |
38 | if (sk) |
39 | bh_lock_sock(sk); | |
40 | ||
41 | switch (ax25->state) { | |
42 | case AX25_STATE_0: | |
43 | /* Magic here: If we listen() and a new link dies before it | |
44 | is accepted() it isn't 'dead' so doesn't get removed. */ | |
45 | if (!sk || sock_flag(sk, SOCK_DESTROY) || | |
46 | (sk->sk_state == TCP_LISTEN && | |
47 | sock_flag(sk, SOCK_DEAD))) { | |
48 | if (sk) { | |
49 | sock_hold(sk); | |
50 | ax25_destroy_socket(ax25); | |
51 | bh_unlock_sock(sk); | |
52 | sock_put(sk); | |
53 | } else | |
54 | ax25_destroy_socket(ax25); | |
55 | return; | |
56 | } | |
57 | break; | |
58 | ||
59 | case AX25_STATE_3: | |
60 | case AX25_STATE_4: | |
61 | /* | |
62 | * Check the state of the receive buffer. | |
63 | */ | |
64 | if (sk != NULL) { | |
65 | if (atomic_read(&sk->sk_rmem_alloc) < | |
66 | (sk->sk_rcvbuf / 2) && | |
67 | (ax25->condition & AX25_COND_OWN_RX_BUSY)) { | |
68 | ax25->condition &= ~AX25_COND_OWN_RX_BUSY; | |
69 | ax25->condition &= ~AX25_COND_ACK_PENDING; | |
70 | ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE); | |
71 | break; | |
72 | } | |
73 | } | |
74 | } | |
75 | ||
76 | if (sk) | |
77 | bh_unlock_sock(sk); | |
78 | ||
79 | ax25_start_heartbeat(ax25); | |
80 | } | |
81 | ||
82 | void ax25_std_t2timer_expiry(ax25_cb *ax25) | |
83 | { | |
84 | if (ax25->condition & AX25_COND_ACK_PENDING) { | |
85 | ax25->condition &= ~AX25_COND_ACK_PENDING; | |
86 | ax25_std_timeout_response(ax25); | |
87 | } | |
88 | } | |
89 | ||
90 | void ax25_std_t3timer_expiry(ax25_cb *ax25) | |
91 | { | |
92 | ax25->n2count = 0; | |
93 | ax25_std_transmit_enquiry(ax25); | |
94 | ax25->state = AX25_STATE_4; | |
95 | } | |
96 | ||
97 | void ax25_std_idletimer_expiry(ax25_cb *ax25) | |
98 | { | |
99 | ax25_clear_queues(ax25); | |
100 | ||
101 | ax25->n2count = 0; | |
102 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); | |
103 | ax25->state = AX25_STATE_2; | |
104 | ||
105 | ax25_calculate_t1(ax25); | |
106 | ax25_start_t1timer(ax25); | |
107 | ax25_stop_t2timer(ax25); | |
108 | ax25_stop_t3timer(ax25); | |
109 | ||
110 | if (ax25->sk != NULL) { | |
111 | bh_lock_sock(ax25->sk); | |
112 | ax25->sk->sk_state = TCP_CLOSE; | |
113 | ax25->sk->sk_err = 0; | |
114 | ax25->sk->sk_shutdown |= SEND_SHUTDOWN; | |
115 | if (!sock_flag(ax25->sk, SOCK_DEAD)) { | |
116 | ax25->sk->sk_state_change(ax25->sk); | |
117 | sock_set_flag(ax25->sk, SOCK_DEAD); | |
118 | } | |
119 | bh_unlock_sock(ax25->sk); | |
120 | } | |
121 | } | |
122 | ||
123 | void ax25_std_t1timer_expiry(ax25_cb *ax25) | |
124 | { | |
125 | switch (ax25->state) { | |
126 | case AX25_STATE_1: | |
127 | if (ax25->n2count == ax25->n2) { | |
128 | if (ax25->modulus == AX25_MODULUS) { | |
129 | ax25_disconnect(ax25, ETIMEDOUT); | |
130 | return; | |
131 | } else { | |
132 | ax25->modulus = AX25_MODULUS; | |
133 | ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; | |
134 | ax25->n2count = 0; | |
135 | ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND); | |
136 | } | |
137 | } else { | |
138 | ax25->n2count++; | |
139 | if (ax25->modulus == AX25_MODULUS) | |
140 | ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND); | |
141 | else | |
142 | ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND); | |
143 | } | |
144 | break; | |
145 | ||
146 | case AX25_STATE_2: | |
147 | if (ax25->n2count == ax25->n2) { | |
148 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); | |
149 | ax25_disconnect(ax25, ETIMEDOUT); | |
150 | return; | |
151 | } else { | |
152 | ax25->n2count++; | |
153 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); | |
154 | } | |
155 | break; | |
156 | ||
157 | case AX25_STATE_3: | |
158 | ax25->n2count = 1; | |
159 | ax25_std_transmit_enquiry(ax25); | |
160 | ax25->state = AX25_STATE_4; | |
161 | break; | |
162 | ||
163 | case AX25_STATE_4: | |
164 | if (ax25->n2count == ax25->n2) { | |
165 | ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE); | |
166 | ax25_disconnect(ax25, ETIMEDOUT); | |
167 | return; | |
168 | } else { | |
169 | ax25->n2count++; | |
170 | ax25_std_transmit_enquiry(ax25); | |
171 | } | |
172 | break; | |
173 | } | |
174 | ||
175 | ax25_calculate_t1(ax25); | |
176 | ax25_start_t1timer(ax25); | |
177 | } |