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/errno.h>
10 #include <linux/types.h>
11 #include <linux/socket.h>
12 #include <linux/in.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/spinlock.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>
25 #include <asm/uaccess.h>
26 #include <asm/system.h>
27 #include <linux/fcntl.h>
28 #include <linux/mm.h>
29 #include <linux/interrupt.h>
30
31 static struct ax25_protocol *protocol_list;
32 static DEFINE_RWLOCK(protocol_list_lock);
33
34 static HLIST_HEAD(ax25_linkfail_list);
35 static DEFINE_SPINLOCK(linkfail_lock);
36
37 static struct listen_struct {
38 struct listen_struct *next;
39 ax25_address callsign;
40 struct net_device *dev;
41 } *listen_list = NULL;
42 static DEFINE_SPINLOCK(listen_lock);
43
44 /*
45 * Do not register the internal protocols AX25_P_TEXT, AX25_P_SEGMENT,
46 * AX25_P_IP or AX25_P_ARP ...
47 */
48 void ax25_register_pid(struct ax25_protocol *ap)
49 {
50 write_lock_bh(&protocol_list_lock);
51 ap->next = protocol_list;
52 protocol_list = ap;
53 write_unlock_bh(&protocol_list_lock);
54 }
55
56 EXPORT_SYMBOL_GPL(ax25_register_pid);
57
58 void ax25_protocol_release(unsigned int pid)
59 {
60 struct ax25_protocol *s, *protocol;
61
62 write_lock_bh(&protocol_list_lock);
63 protocol = protocol_list;
64 if (protocol == NULL) {
65 write_unlock_bh(&protocol_list_lock);
66 return;
67 }
68
69 if (protocol->pid == pid) {
70 protocol_list = protocol->next;
71 write_unlock_bh(&protocol_list_lock);
72 return;
73 }
74
75 while (protocol != NULL && protocol->next != NULL) {
76 if (protocol->next->pid == pid) {
77 s = protocol->next;
78 protocol->next = protocol->next->next;
79 write_unlock_bh(&protocol_list_lock);
80 return;
81 }
82
83 protocol = protocol->next;
84 }
85 write_unlock_bh(&protocol_list_lock);
86 }
87
88 EXPORT_SYMBOL(ax25_protocol_release);
89
90 void ax25_linkfail_register(struct ax25_linkfail *lf)
91 {
92 spin_lock_bh(&linkfail_lock);
93 hlist_add_head(&lf->lf_node, &ax25_linkfail_list);
94 spin_unlock_bh(&linkfail_lock);
95 }
96
97 EXPORT_SYMBOL(ax25_linkfail_register);
98
99 void ax25_linkfail_release(struct ax25_linkfail *lf)
100 {
101 spin_lock_bh(&linkfail_lock);
102 hlist_del_init(&lf->lf_node);
103 spin_unlock_bh(&linkfail_lock);
104 }
105
106 EXPORT_SYMBOL(ax25_linkfail_release);
107
108 int ax25_listen_register(ax25_address *callsign, struct net_device *dev)
109 {
110 struct listen_struct *listen;
111
112 if (ax25_listen_mine(callsign, dev))
113 return 0;
114
115 if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL)
116 return -ENOMEM;
117
118 listen->callsign = *callsign;
119 listen->dev = dev;
120
121 spin_lock_bh(&listen_lock);
122 listen->next = listen_list;
123 listen_list = listen;
124 spin_unlock_bh(&listen_lock);
125
126 return 0;
127 }
128
129 EXPORT_SYMBOL(ax25_listen_register);
130
131 void ax25_listen_release(ax25_address *callsign, struct net_device *dev)
132 {
133 struct listen_struct *s, *listen;
134
135 spin_lock_bh(&listen_lock);
136 listen = listen_list;
137 if (listen == NULL) {
138 spin_unlock_bh(&listen_lock);
139 return;
140 }
141
142 if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {
143 listen_list = listen->next;
144 spin_unlock_bh(&listen_lock);
145 kfree(listen);
146 return;
147 }
148
149 while (listen != NULL && listen->next != NULL) {
150 if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) {
151 s = listen->next;
152 listen->next = listen->next->next;
153 spin_unlock_bh(&listen_lock);
154 kfree(s);
155 return;
156 }
157
158 listen = listen->next;
159 }
160 spin_unlock_bh(&listen_lock);
161 }
162
163 EXPORT_SYMBOL(ax25_listen_release);
164
165 int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *)
166 {
167 int (*res)(struct sk_buff *, ax25_cb *) = NULL;
168 struct ax25_protocol *protocol;
169
170 read_lock(&protocol_list_lock);
171 for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
172 if (protocol->pid == pid) {
173 res = protocol->func;
174 break;
175 }
176 read_unlock(&protocol_list_lock);
177
178 return res;
179 }
180
181 int ax25_listen_mine(ax25_address *callsign, struct net_device *dev)
182 {
183 struct listen_struct *listen;
184
185 spin_lock_bh(&listen_lock);
186 for (listen = listen_list; listen != NULL; listen = listen->next)
187 if (ax25cmp(&listen->callsign, callsign) == 0 &&
188 (listen->dev == dev || listen->dev == NULL)) {
189 spin_unlock_bh(&listen_lock);
190 return 1;
191 }
192 spin_unlock_bh(&listen_lock);
193
194 return 0;
195 }
196
197 void ax25_link_failed(ax25_cb *ax25, int reason)
198 {
199 struct ax25_linkfail *lf;
200 struct hlist_node *node;
201
202 spin_lock_bh(&linkfail_lock);
203 hlist_for_each_entry(lf, node, &ax25_linkfail_list, lf_node)
204 lf->func(ax25, reason);
205 spin_unlock_bh(&linkfail_lock);
206 }
207
208 int ax25_protocol_is_registered(unsigned int pid)
209 {
210 struct ax25_protocol *protocol;
211 int res = 0;
212
213 read_lock_bh(&protocol_list_lock);
214 for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
215 if (protocol->pid == pid) {
216 res = 1;
217 break;
218 }
219 read_unlock_bh(&protocol_list_lock);
220
221 return res;
222 }
223
|
This page was automatically generated by the
LXR engine.
|