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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) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) | |
8 | * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org) | |
9 | */ | |
10 | #include <linux/errno.h> | |
11 | #include <linux/types.h> | |
12 | #include <linux/socket.h> | |
13 | #include <linux/in.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/jiffies.h> | |
16 | #include <linux/timer.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/sockios.h> | |
19 | #include <linux/net.h> | |
20 | #include <net/ax25.h> | |
21 | #include <linux/inet.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/skbuff.h> | |
24 | #include <net/sock.h> | |
c752f073 | 25 | #include <net/tcp_states.h> |
dc8e5416 | 26 | #include <linux/uaccess.h> |
1da177e4 LT |
27 | #include <linux/fcntl.h> |
28 | #include <linux/mm.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <net/netrom.h> | |
31 | ||
32 | static void nr_heartbeat_expiry(unsigned long); | |
33 | static void nr_t1timer_expiry(unsigned long); | |
34 | static void nr_t2timer_expiry(unsigned long); | |
35 | static void nr_t4timer_expiry(unsigned long); | |
36 | static void nr_idletimer_expiry(unsigned long); | |
37 | ||
38 | void nr_init_timers(struct sock *sk) | |
39 | { | |
40 | struct nr_sock *nr = nr_sk(sk); | |
41 | ||
b24b8a24 PE |
42 | setup_timer(&nr->t1timer, nr_t1timer_expiry, (unsigned long)sk); |
43 | setup_timer(&nr->t2timer, nr_t2timer_expiry, (unsigned long)sk); | |
44 | setup_timer(&nr->t4timer, nr_t4timer_expiry, (unsigned long)sk); | |
45 | setup_timer(&nr->idletimer, nr_idletimer_expiry, (unsigned long)sk); | |
1da177e4 LT |
46 | |
47 | /* initialized by sock_init_data */ | |
48 | sk->sk_timer.data = (unsigned long)sk; | |
49 | sk->sk_timer.function = &nr_heartbeat_expiry; | |
50 | } | |
51 | ||
52 | void nr_start_t1timer(struct sock *sk) | |
53 | { | |
54 | struct nr_sock *nr = nr_sk(sk); | |
55 | ||
56 | mod_timer(&nr->t1timer, jiffies + nr->t1); | |
57 | } | |
58 | ||
59 | void nr_start_t2timer(struct sock *sk) | |
60 | { | |
61 | struct nr_sock *nr = nr_sk(sk); | |
62 | ||
63 | mod_timer(&nr->t2timer, jiffies + nr->t2); | |
64 | } | |
65 | ||
66 | void nr_start_t4timer(struct sock *sk) | |
67 | { | |
68 | struct nr_sock *nr = nr_sk(sk); | |
69 | ||
70 | mod_timer(&nr->t4timer, jiffies + nr->t4); | |
71 | } | |
72 | ||
73 | void nr_start_idletimer(struct sock *sk) | |
74 | { | |
75 | struct nr_sock *nr = nr_sk(sk); | |
76 | ||
77 | if (nr->idle > 0) | |
78 | mod_timer(&nr->idletimer, jiffies + nr->idle); | |
79 | } | |
80 | ||
81 | void nr_start_heartbeat(struct sock *sk) | |
82 | { | |
83 | mod_timer(&sk->sk_timer, jiffies + 5 * HZ); | |
84 | } | |
85 | ||
86 | void nr_stop_t1timer(struct sock *sk) | |
87 | { | |
88 | del_timer(&nr_sk(sk)->t1timer); | |
89 | } | |
90 | ||
91 | void nr_stop_t2timer(struct sock *sk) | |
92 | { | |
93 | del_timer(&nr_sk(sk)->t2timer); | |
94 | } | |
95 | ||
96 | void nr_stop_t4timer(struct sock *sk) | |
97 | { | |
98 | del_timer(&nr_sk(sk)->t4timer); | |
99 | } | |
100 | ||
101 | void nr_stop_idletimer(struct sock *sk) | |
102 | { | |
103 | del_timer(&nr_sk(sk)->idletimer); | |
104 | } | |
105 | ||
106 | void nr_stop_heartbeat(struct sock *sk) | |
107 | { | |
108 | del_timer(&sk->sk_timer); | |
109 | } | |
110 | ||
111 | int nr_t1timer_running(struct sock *sk) | |
112 | { | |
113 | return timer_pending(&nr_sk(sk)->t1timer); | |
114 | } | |
115 | ||
116 | static void nr_heartbeat_expiry(unsigned long param) | |
117 | { | |
118 | struct sock *sk = (struct sock *)param; | |
119 | struct nr_sock *nr = nr_sk(sk); | |
120 | ||
121 | bh_lock_sock(sk); | |
122 | switch (nr->state) { | |
123 | case NR_STATE_0: | |
124 | /* Magic here: If we listen() and a new link dies before it | |
125 | is accepted() it isn't 'dead' so doesn't get removed. */ | |
126 | if (sock_flag(sk, SOCK_DESTROY) || | |
127 | (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) { | |
128 | sock_hold(sk); | |
1da177e4 | 129 | bh_unlock_sock(sk); |
8bf2b7b1 | 130 | nr_destroy_socket(sk); |
1da177e4 LT |
131 | sock_put(sk); |
132 | return; | |
133 | } | |
134 | break; | |
135 | ||
136 | case NR_STATE_3: | |
137 | /* | |
138 | * Check for the state of the receive buffer. | |
139 | */ | |
140 | if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) && | |
141 | (nr->condition & NR_COND_OWN_RX_BUSY)) { | |
142 | nr->condition &= ~NR_COND_OWN_RX_BUSY; | |
143 | nr->condition &= ~NR_COND_ACK_PENDING; | |
144 | nr->vl = nr->vr; | |
145 | nr_write_internal(sk, NR_INFOACK); | |
146 | break; | |
147 | } | |
148 | break; | |
149 | } | |
150 | ||
151 | nr_start_heartbeat(sk); | |
152 | bh_unlock_sock(sk); | |
153 | } | |
154 | ||
155 | static void nr_t2timer_expiry(unsigned long param) | |
156 | { | |
157 | struct sock *sk = (struct sock *)param; | |
158 | struct nr_sock *nr = nr_sk(sk); | |
159 | ||
160 | bh_lock_sock(sk); | |
161 | if (nr->condition & NR_COND_ACK_PENDING) { | |
162 | nr->condition &= ~NR_COND_ACK_PENDING; | |
163 | nr_enquiry_response(sk); | |
164 | } | |
165 | bh_unlock_sock(sk); | |
166 | } | |
167 | ||
168 | static void nr_t4timer_expiry(unsigned long param) | |
169 | { | |
170 | struct sock *sk = (struct sock *)param; | |
171 | ||
172 | bh_lock_sock(sk); | |
173 | nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY; | |
174 | bh_unlock_sock(sk); | |
175 | } | |
176 | ||
177 | static void nr_idletimer_expiry(unsigned long param) | |
178 | { | |
179 | struct sock *sk = (struct sock *)param; | |
180 | struct nr_sock *nr = nr_sk(sk); | |
181 | ||
182 | bh_lock_sock(sk); | |
183 | ||
184 | nr_clear_queues(sk); | |
185 | ||
186 | nr->n2count = 0; | |
187 | nr_write_internal(sk, NR_DISCREQ); | |
188 | nr->state = NR_STATE_2; | |
189 | ||
190 | nr_start_t1timer(sk); | |
191 | nr_stop_t2timer(sk); | |
192 | nr_stop_t4timer(sk); | |
193 | ||
194 | sk->sk_state = TCP_CLOSE; | |
195 | sk->sk_err = 0; | |
196 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
197 | ||
198 | if (!sock_flag(sk, SOCK_DEAD)) { | |
199 | sk->sk_state_change(sk); | |
200 | sock_set_flag(sk, SOCK_DEAD); | |
201 | } | |
202 | bh_unlock_sock(sk); | |
203 | } | |
204 | ||
205 | static void nr_t1timer_expiry(unsigned long param) | |
206 | { | |
207 | struct sock *sk = (struct sock *)param; | |
208 | struct nr_sock *nr = nr_sk(sk); | |
209 | ||
210 | bh_lock_sock(sk); | |
211 | switch (nr->state) { | |
212 | case NR_STATE_1: | |
213 | if (nr->n2count == nr->n2) { | |
214 | nr_disconnect(sk, ETIMEDOUT); | |
215 | bh_unlock_sock(sk); | |
216 | return; | |
217 | } else { | |
218 | nr->n2count++; | |
219 | nr_write_internal(sk, NR_CONNREQ); | |
220 | } | |
221 | break; | |
222 | ||
223 | case NR_STATE_2: | |
224 | if (nr->n2count == nr->n2) { | |
225 | nr_disconnect(sk, ETIMEDOUT); | |
226 | bh_unlock_sock(sk); | |
227 | return; | |
228 | } else { | |
229 | nr->n2count++; | |
230 | nr_write_internal(sk, NR_DISCREQ); | |
231 | } | |
232 | break; | |
233 | ||
234 | case NR_STATE_3: | |
235 | if (nr->n2count == nr->n2) { | |
236 | nr_disconnect(sk, ETIMEDOUT); | |
237 | bh_unlock_sock(sk); | |
238 | return; | |
239 | } else { | |
240 | nr->n2count++; | |
241 | nr_requeue_frames(sk); | |
242 | } | |
243 | break; | |
244 | } | |
245 | ||
246 | nr_start_t1timer(sk); | |
247 | bh_unlock_sock(sk); | |
248 | } |