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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 | */ | |
9 | #include <linux/config.h> | |
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/sched.h> | |
16 | #include <linux/spinlock.h> | |
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> | |
26 | #include <asm/uaccess.h> | |
27 | #include <asm/system.h> | |
28 | #include <linux/fcntl.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/interrupt.h> | |
31 | ||
32 | static struct protocol_struct { | |
33 | struct protocol_struct *next; | |
34 | unsigned int pid; | |
35 | int (*func)(struct sk_buff *, ax25_cb *); | |
36 | } *protocol_list = NULL; | |
37 | static DEFINE_RWLOCK(protocol_list_lock); | |
38 | ||
39 | static struct linkfail_struct { | |
40 | struct linkfail_struct *next; | |
41 | void (*func)(ax25_cb *, int); | |
42 | } *linkfail_list = NULL; | |
43 | static DEFINE_SPINLOCK(linkfail_lock); | |
44 | ||
45 | static struct listen_struct { | |
46 | struct listen_struct *next; | |
47 | ax25_address callsign; | |
48 | struct net_device *dev; | |
49 | } *listen_list = NULL; | |
50 | static DEFINE_SPINLOCK(listen_lock); | |
51 | ||
52 | int ax25_protocol_register(unsigned int pid, | |
53 | int (*func)(struct sk_buff *, ax25_cb *)) | |
54 | { | |
55 | struct protocol_struct *protocol; | |
56 | ||
57 | if (pid == AX25_P_TEXT || pid == AX25_P_SEGMENT) | |
58 | return 0; | |
59 | #ifdef CONFIG_INET | |
60 | if (pid == AX25_P_IP || pid == AX25_P_ARP) | |
61 | return 0; | |
62 | #endif | |
63 | if ((protocol = kmalloc(sizeof(*protocol), GFP_ATOMIC)) == NULL) | |
64 | return 0; | |
65 | ||
66 | protocol->pid = pid; | |
67 | protocol->func = func; | |
68 | ||
69 | write_lock(&protocol_list_lock); | |
70 | protocol->next = protocol_list; | |
71 | protocol_list = protocol; | |
72 | write_unlock(&protocol_list_lock); | |
73 | ||
74 | return 1; | |
75 | } | |
76 | ||
77 | void ax25_protocol_release(unsigned int pid) | |
78 | { | |
79 | struct protocol_struct *s, *protocol; | |
80 | ||
81 | write_lock(&protocol_list_lock); | |
82 | protocol = protocol_list; | |
83 | if (protocol == NULL) { | |
84 | write_unlock(&protocol_list_lock); | |
85 | return; | |
86 | } | |
87 | ||
88 | if (protocol->pid == pid) { | |
89 | protocol_list = protocol->next; | |
90 | write_unlock(&protocol_list_lock); | |
91 | kfree(protocol); | |
92 | return; | |
93 | } | |
94 | ||
95 | while (protocol != NULL && protocol->next != NULL) { | |
96 | if (protocol->next->pid == pid) { | |
97 | s = protocol->next; | |
98 | protocol->next = protocol->next->next; | |
99 | write_unlock(&protocol_list_lock); | |
100 | kfree(s); | |
101 | return; | |
102 | } | |
103 | ||
104 | protocol = protocol->next; | |
105 | } | |
106 | write_unlock(&protocol_list_lock); | |
107 | } | |
108 | ||
109 | int ax25_linkfail_register(void (*func)(ax25_cb *, int)) | |
110 | { | |
111 | struct linkfail_struct *linkfail; | |
112 | ||
113 | if ((linkfail = kmalloc(sizeof(*linkfail), GFP_ATOMIC)) == NULL) | |
114 | return 0; | |
115 | ||
116 | linkfail->func = func; | |
117 | ||
118 | spin_lock_bh(&linkfail_lock); | |
119 | linkfail->next = linkfail_list; | |
120 | linkfail_list = linkfail; | |
121 | spin_unlock_bh(&linkfail_lock); | |
122 | ||
123 | return 1; | |
124 | } | |
125 | ||
126 | void ax25_linkfail_release(void (*func)(ax25_cb *, int)) | |
127 | { | |
128 | struct linkfail_struct *s, *linkfail; | |
129 | ||
130 | spin_lock_bh(&linkfail_lock); | |
131 | linkfail = linkfail_list; | |
132 | if (linkfail == NULL) { | |
133 | spin_unlock_bh(&linkfail_lock); | |
134 | return; | |
135 | } | |
136 | ||
137 | if (linkfail->func == func) { | |
138 | linkfail_list = linkfail->next; | |
139 | spin_unlock_bh(&linkfail_lock); | |
140 | kfree(linkfail); | |
141 | return; | |
142 | } | |
143 | ||
144 | while (linkfail != NULL && linkfail->next != NULL) { | |
145 | if (linkfail->next->func == func) { | |
146 | s = linkfail->next; | |
147 | linkfail->next = linkfail->next->next; | |
148 | spin_unlock_bh(&linkfail_lock); | |
149 | kfree(s); | |
150 | return; | |
151 | } | |
152 | ||
153 | linkfail = linkfail->next; | |
154 | } | |
155 | spin_unlock_bh(&linkfail_lock); | |
156 | } | |
157 | ||
158 | int ax25_listen_register(ax25_address *callsign, struct net_device *dev) | |
159 | { | |
160 | struct listen_struct *listen; | |
161 | ||
162 | if (ax25_listen_mine(callsign, dev)) | |
163 | return 0; | |
164 | ||
165 | if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL) | |
166 | return 0; | |
167 | ||
168 | listen->callsign = *callsign; | |
169 | listen->dev = dev; | |
170 | ||
171 | spin_lock_bh(&listen_lock); | |
172 | listen->next = listen_list; | |
173 | listen_list = listen; | |
174 | spin_unlock_bh(&listen_lock); | |
175 | ||
176 | return 1; | |
177 | } | |
178 | ||
179 | void ax25_listen_release(ax25_address *callsign, struct net_device *dev) | |
180 | { | |
181 | struct listen_struct *s, *listen; | |
182 | ||
183 | spin_lock_bh(&listen_lock); | |
184 | listen = listen_list; | |
185 | if (listen == NULL) { | |
186 | spin_unlock_bh(&listen_lock); | |
187 | return; | |
188 | } | |
189 | ||
190 | if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) { | |
191 | listen_list = listen->next; | |
192 | spin_unlock_bh(&listen_lock); | |
193 | kfree(listen); | |
194 | return; | |
195 | } | |
196 | ||
197 | while (listen != NULL && listen->next != NULL) { | |
198 | if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) { | |
199 | s = listen->next; | |
200 | listen->next = listen->next->next; | |
201 | spin_unlock_bh(&listen_lock); | |
202 | kfree(s); | |
203 | return; | |
204 | } | |
205 | ||
206 | listen = listen->next; | |
207 | } | |
208 | spin_unlock_bh(&listen_lock); | |
209 | } | |
210 | ||
211 | int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *) | |
212 | { | |
213 | int (*res)(struct sk_buff *, ax25_cb *) = NULL; | |
214 | struct protocol_struct *protocol; | |
215 | ||
216 | read_lock(&protocol_list_lock); | |
217 | for (protocol = protocol_list; protocol != NULL; protocol = protocol->next) | |
218 | if (protocol->pid == pid) { | |
219 | res = protocol->func; | |
220 | break; | |
221 | } | |
222 | read_unlock(&protocol_list_lock); | |
223 | ||
224 | return res; | |
225 | } | |
226 | ||
227 | int ax25_listen_mine(ax25_address *callsign, struct net_device *dev) | |
228 | { | |
229 | struct listen_struct *listen; | |
230 | ||
231 | spin_lock_bh(&listen_lock); | |
232 | for (listen = listen_list; listen != NULL; listen = listen->next) | |
233 | if (ax25cmp(&listen->callsign, callsign) == 0 && (listen->dev == dev || listen->dev == NULL)) { | |
234 | spin_unlock_bh(&listen_lock); | |
235 | return 1; | |
236 | } | |
237 | spin_unlock_bh(&listen_lock); | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | void ax25_link_failed(ax25_cb *ax25, int reason) | |
243 | { | |
244 | struct linkfail_struct *linkfail; | |
245 | ||
246 | spin_lock_bh(&linkfail_lock); | |
247 | for (linkfail = linkfail_list; linkfail != NULL; linkfail = linkfail->next) | |
248 | (linkfail->func)(ax25, reason); | |
249 | spin_unlock_bh(&linkfail_lock); | |
250 | } | |
251 | ||
252 | int ax25_protocol_is_registered(unsigned int pid) | |
253 | { | |
254 | struct protocol_struct *protocol; | |
255 | int res = 0; | |
256 | ||
257 | read_lock(&protocol_list_lock); | |
258 | for (protocol = protocol_list; protocol != NULL; protocol = protocol->next) | |
259 | if (protocol->pid == pid) { | |
260 | res = 1; | |
261 | break; | |
262 | } | |
263 | read_unlock(&protocol_list_lock); | |
264 | ||
265 | return res; | |
266 | } |