blob: 16be0c14780a18415bf203f617b8cb1c4cdb0808 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/errno.h>
10#include <linux/types.h>
11#include <linux/socket.h>
12#include <linux/in.h>
13#include <linux/kernel.h>
Ralf Baechle70868ea2006-05-03 23:25:17 -070014#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#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
Ralf Baechle8d5cf592006-12-14 15:50:01 -080031static struct ax25_protocol *protocol_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070032static DEFINE_RWLOCK(protocol_list_lock);
33
Ralf Baechlea4282712006-12-14 15:51:23 -080034static HLIST_HEAD(ax25_linkfail_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035static DEFINE_SPINLOCK(linkfail_lock);
36
37static struct listen_struct {
38 struct listen_struct *next;
39 ax25_address callsign;
40 struct net_device *dev;
41} *listen_list = NULL;
42static DEFINE_SPINLOCK(listen_lock);
43
Ralf Baechle8d5cf592006-12-14 15:50:01 -080044/*
45 * Do not register the internal protocols AX25_P_TEXT, AX25_P_SEGMENT,
46 * AX25_P_IP or AX25_P_ARP ...
47 */
48void ax25_register_pid(struct ax25_protocol *ap)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
Ralf Baechle95ff9f42006-07-10 16:21:29 -070050 write_lock_bh(&protocol_list_lock);
Ralf Baechle8d5cf592006-12-14 15:50:01 -080051 ap->next = protocol_list;
52 protocol_list = ap;
Ralf Baechle95ff9f42006-07-10 16:21:29 -070053 write_unlock_bh(&protocol_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054}
55
Ralf Baechle8d5cf592006-12-14 15:50:01 -080056EXPORT_SYMBOL_GPL(ax25_register_pid);
Ralf Baechle70868ea2006-05-03 23:25:17 -070057
Linus Torvalds1da177e2005-04-16 15:20:36 -070058void ax25_protocol_release(unsigned int pid)
59{
Ralf Baechle8d5cf592006-12-14 15:50:01 -080060 struct ax25_protocol *s, *protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Ralf Baechle95ff9f42006-07-10 16:21:29 -070062 write_lock_bh(&protocol_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 protocol = protocol_list;
64 if (protocol == NULL) {
Ralf Baechle95ff9f42006-07-10 16:21:29 -070065 write_unlock_bh(&protocol_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 return;
67 }
68
69 if (protocol->pid == pid) {
70 protocol_list = protocol->next;
Ralf Baechle95ff9f42006-07-10 16:21:29 -070071 write_unlock_bh(&protocol_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 kfree(protocol);
73 return;
74 }
75
76 while (protocol != NULL && protocol->next != NULL) {
77 if (protocol->next->pid == pid) {
78 s = protocol->next;
79 protocol->next = protocol->next->next;
Ralf Baechle95ff9f42006-07-10 16:21:29 -070080 write_unlock_bh(&protocol_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 kfree(s);
82 return;
83 }
84
85 protocol = protocol->next;
86 }
Ralf Baechle95ff9f42006-07-10 16:21:29 -070087 write_unlock_bh(&protocol_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088}
89
Ralf Baechle70868ea2006-05-03 23:25:17 -070090EXPORT_SYMBOL(ax25_protocol_release);
91
Ralf Baechlea4282712006-12-14 15:51:23 -080092void ax25_linkfail_register(struct ax25_linkfail *lf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 spin_lock_bh(&linkfail_lock);
Ralf Baechlea4282712006-12-14 15:51:23 -080095 hlist_add_head(&lf->lf_node, &ax25_linkfail_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 spin_unlock_bh(&linkfail_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097}
98
Ralf Baechle70868ea2006-05-03 23:25:17 -070099EXPORT_SYMBOL(ax25_linkfail_register);
100
Ralf Baechlea4282712006-12-14 15:51:23 -0800101void ax25_linkfail_release(struct ax25_linkfail *lf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 spin_lock_bh(&linkfail_lock);
Ralf Baechlea4282712006-12-14 15:51:23 -0800104 hlist_del_init(&lf->lf_node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 spin_unlock_bh(&linkfail_lock);
106}
107
Ralf Baechle70868ea2006-05-03 23:25:17 -0700108EXPORT_SYMBOL(ax25_linkfail_release);
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110int ax25_listen_register(ax25_address *callsign, struct net_device *dev)
111{
112 struct listen_struct *listen;
113
114 if (ax25_listen_mine(callsign, dev))
115 return 0;
116
117 if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL)
Ralf Baechle81dcd162006-12-14 15:50:34 -0800118 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120 listen->callsign = *callsign;
121 listen->dev = dev;
122
123 spin_lock_bh(&listen_lock);
124 listen->next = listen_list;
125 listen_list = listen;
126 spin_unlock_bh(&listen_lock);
127
Ralf Baechle81dcd162006-12-14 15:50:34 -0800128 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129}
130
Ralf Baechle70868ea2006-05-03 23:25:17 -0700131EXPORT_SYMBOL(ax25_listen_register);
132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133void ax25_listen_release(ax25_address *callsign, struct net_device *dev)
134{
135 struct listen_struct *s, *listen;
136
137 spin_lock_bh(&listen_lock);
138 listen = listen_list;
139 if (listen == NULL) {
140 spin_unlock_bh(&listen_lock);
141 return;
142 }
143
144 if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {
145 listen_list = listen->next;
146 spin_unlock_bh(&listen_lock);
147 kfree(listen);
148 return;
149 }
150
151 while (listen != NULL && listen->next != NULL) {
152 if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) {
153 s = listen->next;
154 listen->next = listen->next->next;
155 spin_unlock_bh(&listen_lock);
156 kfree(s);
157 return;
158 }
159
160 listen = listen->next;
161 }
162 spin_unlock_bh(&listen_lock);
163}
164
Ralf Baechle70868ea2006-05-03 23:25:17 -0700165EXPORT_SYMBOL(ax25_listen_release);
166
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *)
168{
169 int (*res)(struct sk_buff *, ax25_cb *) = NULL;
Ralf Baechle8d5cf592006-12-14 15:50:01 -0800170 struct ax25_protocol *protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172 read_lock(&protocol_list_lock);
173 for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
174 if (protocol->pid == pid) {
175 res = protocol->func;
176 break;
177 }
178 read_unlock(&protocol_list_lock);
179
180 return res;
181}
182
183int ax25_listen_mine(ax25_address *callsign, struct net_device *dev)
184{
185 struct listen_struct *listen;
186
187 spin_lock_bh(&listen_lock);
188 for (listen = listen_list; listen != NULL; listen = listen->next)
Ralf Baechle81dcd162006-12-14 15:50:34 -0800189 if (ax25cmp(&listen->callsign, callsign) == 0 &&
190 (listen->dev == dev || listen->dev == NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 spin_unlock_bh(&listen_lock);
192 return 1;
193 }
194 spin_unlock_bh(&listen_lock);
195
196 return 0;
197}
198
199void ax25_link_failed(ax25_cb *ax25, int reason)
200{
Ralf Baechlea4282712006-12-14 15:51:23 -0800201 struct ax25_linkfail *lf;
202 struct hlist_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204 spin_lock_bh(&linkfail_lock);
Ralf Baechlea4282712006-12-14 15:51:23 -0800205 hlist_for_each_entry(lf, node, &ax25_linkfail_list, lf_node)
206 lf->func(ax25, reason);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 spin_unlock_bh(&linkfail_lock);
208}
209
210int ax25_protocol_is_registered(unsigned int pid)
211{
Ralf Baechle8d5cf592006-12-14 15:50:01 -0800212 struct ax25_protocol *protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 int res = 0;
214
Ralf Baechle95ff9f42006-07-10 16:21:29 -0700215 read_lock_bh(&protocol_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
217 if (protocol->pid == pid) {
218 res = 1;
219 break;
220 }
Ralf Baechle95ff9f42006-07-10 16:21:29 -0700221 read_unlock_bh(&protocol_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
223 return res;
224}