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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> | |
1da177e4 LT |
17 | #include <linux/timer.h> |
18 | #include <linux/string.h> | |
19 | #include <linux/sockios.h> | |
20 | #include <linux/net.h> | |
21 | #include <net/ax25.h> | |
22 | #include <linux/inet.h> | |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <net/sock.h> | |
c752f073 | 26 | #include <net/tcp_states.h> |
1da177e4 LT |
27 | #include <asm/uaccess.h> |
28 | #include <asm/system.h> | |
29 | #include <linux/fcntl.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/interrupt.h> | |
32 | ||
33 | void ax25_std_heartbeat_expiry(ax25_cb *ax25) | |
34 | { | |
f16f3026 | 35 | struct sock *sk = ax25->sk; |
528930b9 | 36 | |
1da177e4 LT |
37 | if (sk) |
38 | bh_lock_sock(sk); | |
39 | ||
40 | switch (ax25->state) { | |
41 | case AX25_STATE_0: | |
30902dc3 DM |
42 | if (!sk || |
43 | sock_flag(sk, SOCK_DESTROY) || | |
44 | sock_flag(sk, SOCK_DEAD)) { | |
1da177e4 LT |
45 | if (sk) { |
46 | sock_hold(sk); | |
47 | ax25_destroy_socket(ax25); | |
48 | bh_unlock_sock(sk); | |
49 | sock_put(sk); | |
50 | } else | |
51 | ax25_destroy_socket(ax25); | |
52 | return; | |
53 | } | |
54 | break; | |
55 | ||
56 | case AX25_STATE_3: | |
57 | case AX25_STATE_4: | |
58 | /* | |
59 | * Check the state of the receive buffer. | |
60 | */ | |
61 | if (sk != NULL) { | |
62 | if (atomic_read(&sk->sk_rmem_alloc) < | |
f16f3026 | 63 | (sk->sk_rcvbuf >> 1) && |
1da177e4 LT |
64 | (ax25->condition & AX25_COND_OWN_RX_BUSY)) { |
65 | ax25->condition &= ~AX25_COND_OWN_RX_BUSY; | |
66 | ax25->condition &= ~AX25_COND_ACK_PENDING; | |
67 | ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE); | |
68 | break; | |
69 | } | |
70 | } | |
71 | } | |
72 | ||
73 | if (sk) | |
74 | bh_unlock_sock(sk); | |
75 | ||
76 | ax25_start_heartbeat(ax25); | |
77 | } | |
78 | ||
79 | void ax25_std_t2timer_expiry(ax25_cb *ax25) | |
80 | { | |
81 | if (ax25->condition & AX25_COND_ACK_PENDING) { | |
82 | ax25->condition &= ~AX25_COND_ACK_PENDING; | |
83 | ax25_std_timeout_response(ax25); | |
84 | } | |
85 | } | |
86 | ||
87 | void ax25_std_t3timer_expiry(ax25_cb *ax25) | |
88 | { | |
89 | ax25->n2count = 0; | |
90 | ax25_std_transmit_enquiry(ax25); | |
91 | ax25->state = AX25_STATE_4; | |
92 | } | |
93 | ||
94 | void ax25_std_idletimer_expiry(ax25_cb *ax25) | |
95 | { | |
96 | ax25_clear_queues(ax25); | |
97 | ||
98 | ax25->n2count = 0; | |
99 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); | |
100 | ax25->state = AX25_STATE_2; | |
101 | ||
102 | ax25_calculate_t1(ax25); | |
103 | ax25_start_t1timer(ax25); | |
104 | ax25_stop_t2timer(ax25); | |
105 | ax25_stop_t3timer(ax25); | |
106 | ||
107 | if (ax25->sk != NULL) { | |
108 | bh_lock_sock(ax25->sk); | |
109 | ax25->sk->sk_state = TCP_CLOSE; | |
110 | ax25->sk->sk_err = 0; | |
111 | ax25->sk->sk_shutdown |= SEND_SHUTDOWN; | |
112 | if (!sock_flag(ax25->sk, SOCK_DEAD)) { | |
113 | ax25->sk->sk_state_change(ax25->sk); | |
114 | sock_set_flag(ax25->sk, SOCK_DEAD); | |
115 | } | |
116 | bh_unlock_sock(ax25->sk); | |
117 | } | |
118 | } | |
119 | ||
120 | void ax25_std_t1timer_expiry(ax25_cb *ax25) | |
121 | { | |
122 | switch (ax25->state) { | |
123 | case AX25_STATE_1: | |
124 | if (ax25->n2count == ax25->n2) { | |
125 | if (ax25->modulus == AX25_MODULUS) { | |
126 | ax25_disconnect(ax25, ETIMEDOUT); | |
127 | return; | |
128 | } else { | |
129 | ax25->modulus = AX25_MODULUS; | |
130 | ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; | |
131 | ax25->n2count = 0; | |
132 | ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND); | |
133 | } | |
134 | } else { | |
135 | ax25->n2count++; | |
136 | if (ax25->modulus == AX25_MODULUS) | |
137 | ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND); | |
138 | else | |
139 | ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND); | |
140 | } | |
141 | break; | |
142 | ||
143 | case AX25_STATE_2: | |
144 | if (ax25->n2count == ax25->n2) { | |
145 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); | |
146 | ax25_disconnect(ax25, ETIMEDOUT); | |
147 | return; | |
148 | } else { | |
149 | ax25->n2count++; | |
150 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); | |
151 | } | |
152 | break; | |
153 | ||
154 | case AX25_STATE_3: | |
155 | ax25->n2count = 1; | |
156 | ax25_std_transmit_enquiry(ax25); | |
157 | ax25->state = AX25_STATE_4; | |
158 | break; | |
159 | ||
160 | case AX25_STATE_4: | |
161 | if (ax25->n2count == ax25->n2) { | |
162 | ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE); | |
163 | ax25_disconnect(ax25, ETIMEDOUT); | |
164 | return; | |
165 | } else { | |
166 | ax25->n2count++; | |
167 | ax25_std_transmit_enquiry(ax25); | |
168 | } | |
169 | break; | |
170 | } | |
171 | ||
172 | ax25_calculate_t1(ax25); | |
173 | ax25_start_t1timer(ax25); | |
174 | } |