blob: 5a0dda8df492424b4e0c24255a625373b5cacf09 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#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
Ralf Baechle8d5cf592006-12-14 15:50:01 -080032static struct ax25_protocol *protocol_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070033static DEFINE_RWLOCK(protocol_list_lock);
34
Ralf Baechlea4282712006-12-14 15:51:23 -080035static HLIST_HEAD(ax25_linkfail_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036static DEFINE_SPINLOCK(linkfail_lock);
37
38static struct listen_struct {
39 struct listen_struct *next;
40 ax25_address callsign;
41 struct net_device *dev;
42} *listen_list = NULL;
43static DEFINE_SPINLOCK(listen_lock);
44
Ralf Baechle8d5cf592006-12-14 15:50:01 -080045/*
46 * Do not register the internal protocols AX25_P_TEXT, AX25_P_SEGMENT,
47 * AX25_P_IP or AX25_P_ARP ...
48 */
49void ax25_register_pid(struct ax25_protocol *ap)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050{
Ralf Baechle95ff9f42006-07-10 16:21:29 -070051 write_lock_bh(&protocol_list_lock);
Ralf Baechle8d5cf592006-12-14 15:50:01 -080052 ap->next = protocol_list;
53 protocol_list = ap;
Ralf Baechle95ff9f42006-07-10 16:21:29 -070054 write_unlock_bh(&protocol_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055}
56
Ralf Baechle8d5cf592006-12-14 15:50:01 -080057EXPORT_SYMBOL_GPL(ax25_register_pid);
Ralf Baechle70868ea2006-05-03 23:25:17 -070058
Linus Torvalds1da177e2005-04-16 15:20:36 -070059void ax25_protocol_release(unsigned int pid)
60{
Ralf Baechle8d5cf592006-12-14 15:50:01 -080061 struct ax25_protocol *s, *protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Ralf Baechle95ff9f42006-07-10 16:21:29 -070063 write_lock_bh(&protocol_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 protocol = protocol_list;
Ilpo Järvinen910d30b2009-02-06 23:47:14 -080065 if (protocol == NULL)
66 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68 if (protocol->pid == pid) {
69 protocol_list = protocol->next;
Ilpo Järvinen910d30b2009-02-06 23:47:14 -080070 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 }
72
73 while (protocol != NULL && protocol->next != NULL) {
74 if (protocol->next->pid == pid) {
75 s = protocol->next;
76 protocol->next = protocol->next->next;
Ilpo Järvinen910d30b2009-02-06 23:47:14 -080077 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 }
79
80 protocol = protocol->next;
81 }
Ilpo Järvinen910d30b2009-02-06 23:47:14 -080082out:
Ralf Baechle95ff9f42006-07-10 16:21:29 -070083 write_unlock_bh(&protocol_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084}
85
Ralf Baechle70868ea2006-05-03 23:25:17 -070086EXPORT_SYMBOL(ax25_protocol_release);
87
Ralf Baechlea4282712006-12-14 15:51:23 -080088void ax25_linkfail_register(struct ax25_linkfail *lf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089{
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 spin_lock_bh(&linkfail_lock);
Ralf Baechlea4282712006-12-14 15:51:23 -080091 hlist_add_head(&lf->lf_node, &ax25_linkfail_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 spin_unlock_bh(&linkfail_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093}
94
Ralf Baechle70868ea2006-05-03 23:25:17 -070095EXPORT_SYMBOL(ax25_linkfail_register);
96
Ralf Baechlea4282712006-12-14 15:51:23 -080097void ax25_linkfail_release(struct ax25_linkfail *lf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 spin_lock_bh(&linkfail_lock);
Ralf Baechlea4282712006-12-14 15:51:23 -0800100 hlist_del_init(&lf->lf_node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 spin_unlock_bh(&linkfail_lock);
102}
103
Ralf Baechle70868ea2006-05-03 23:25:17 -0700104EXPORT_SYMBOL(ax25_linkfail_release);
105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106int ax25_listen_register(ax25_address *callsign, struct net_device *dev)
107{
108 struct listen_struct *listen;
109
110 if (ax25_listen_mine(callsign, dev))
111 return 0;
112
113 if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL)
Ralf Baechle81dcd162006-12-14 15:50:34 -0800114 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
116 listen->callsign = *callsign;
117 listen->dev = dev;
118
119 spin_lock_bh(&listen_lock);
120 listen->next = listen_list;
121 listen_list = listen;
122 spin_unlock_bh(&listen_lock);
123
Ralf Baechle81dcd162006-12-14 15:50:34 -0800124 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125}
126
Ralf Baechle70868ea2006-05-03 23:25:17 -0700127EXPORT_SYMBOL(ax25_listen_register);
128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129void ax25_listen_release(ax25_address *callsign, struct net_device *dev)
130{
131 struct listen_struct *s, *listen;
132
133 spin_lock_bh(&listen_lock);
134 listen = listen_list;
135 if (listen == NULL) {
136 spin_unlock_bh(&listen_lock);
137 return;
138 }
139
140 if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {
141 listen_list = listen->next;
142 spin_unlock_bh(&listen_lock);
143 kfree(listen);
144 return;
145 }
146
147 while (listen != NULL && listen->next != NULL) {
148 if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) {
149 s = listen->next;
150 listen->next = listen->next->next;
151 spin_unlock_bh(&listen_lock);
152 kfree(s);
153 return;
154 }
155
156 listen = listen->next;
157 }
158 spin_unlock_bh(&listen_lock);
159}
160
Ralf Baechle70868ea2006-05-03 23:25:17 -0700161EXPORT_SYMBOL(ax25_listen_release);
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *)
164{
165 int (*res)(struct sk_buff *, ax25_cb *) = NULL;
Ralf Baechle8d5cf592006-12-14 15:50:01 -0800166 struct ax25_protocol *protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
168 read_lock(&protocol_list_lock);
169 for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
170 if (protocol->pid == pid) {
171 res = protocol->func;
172 break;
173 }
174 read_unlock(&protocol_list_lock);
175
176 return res;
177}
178
179int ax25_listen_mine(ax25_address *callsign, struct net_device *dev)
180{
181 struct listen_struct *listen;
182
183 spin_lock_bh(&listen_lock);
184 for (listen = listen_list; listen != NULL; listen = listen->next)
Ralf Baechle81dcd162006-12-14 15:50:34 -0800185 if (ax25cmp(&listen->callsign, callsign) == 0 &&
186 (listen->dev == dev || listen->dev == NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 spin_unlock_bh(&listen_lock);
188 return 1;
189 }
190 spin_unlock_bh(&listen_lock);
191
192 return 0;
193}
194
195void ax25_link_failed(ax25_cb *ax25, int reason)
196{
Ralf Baechlea4282712006-12-14 15:51:23 -0800197 struct ax25_linkfail *lf;
198 struct hlist_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
200 spin_lock_bh(&linkfail_lock);
Ralf Baechlea4282712006-12-14 15:51:23 -0800201 hlist_for_each_entry(lf, node, &ax25_linkfail_list, lf_node)
202 lf->func(ax25, reason);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 spin_unlock_bh(&linkfail_lock);
204}
205
206int ax25_protocol_is_registered(unsigned int pid)
207{
Ralf Baechle8d5cf592006-12-14 15:50:01 -0800208 struct ax25_protocol *protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 int res = 0;
210
Ralf Baechle95ff9f42006-07-10 16:21:29 -0700211 read_lock_bh(&protocol_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
213 if (protocol->pid == pid) {
214 res = 1;
215 break;
216 }
Ralf Baechle95ff9f42006-07-10 16:21:29 -0700217 read_unlock_bh(&protocol_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
219 return res;
220}