blob: dab77efe34a6620932d2a1063bcec9b8a129ad2b [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 */
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/timer.h>
17#include <linux/string.h>
18#include <linux/sockios.h>
19#include <linux/net.h>
20#include <linux/spinlock.h>
21#include <net/ax25.h>
22#include <linux/inet.h>
23#include <linux/netdevice.h>
24#include <linux/if_arp.h>
25#include <linux/skbuff.h>
26#include <net/sock.h>
27#include <asm/uaccess.h>
28#include <asm/system.h>
29#include <linux/fcntl.h>
30#include <linux/mm.h>
31#include <linux/interrupt.h>
32#include <linux/init.h>
33
34ax25_dev *ax25_dev_list;
35DEFINE_SPINLOCK(ax25_dev_lock);
36
37ax25_dev *ax25_addr_ax25dev(ax25_address *addr)
38{
39 ax25_dev *ax25_dev, *res = NULL;
40
41 spin_lock_bh(&ax25_dev_lock);
42 for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
43 if (ax25cmp(addr, (ax25_address *)ax25_dev->dev->dev_addr) == 0) {
44 res = ax25_dev;
45 }
46 spin_unlock_bh(&ax25_dev_lock);
47
48 return res;
49}
50
51/*
52 * This is called when an interface is brought up. These are
53 * reasonable defaults.
54 */
55void ax25_dev_device_up(struct net_device *dev)
56{
57 ax25_dev *ax25_dev;
58
59 if ((ax25_dev = kmalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) {
60 printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n");
61 return;
62 }
63
64 ax25_unregister_sysctl();
65
66 memset(ax25_dev, 0x00, sizeof(*ax25_dev));
67
68 dev->ax25_ptr = ax25_dev;
69 ax25_dev->dev = dev;
70 dev_hold(dev);
71 ax25_dev->forward = NULL;
72
73 ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE;
74 ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE;
75 ax25_dev->values[AX25_VALUES_BACKOFF] = AX25_DEF_BACKOFF;
76 ax25_dev->values[AX25_VALUES_CONMODE] = AX25_DEF_CONMODE;
77 ax25_dev->values[AX25_VALUES_WINDOW] = AX25_DEF_WINDOW;
78 ax25_dev->values[AX25_VALUES_EWINDOW] = AX25_DEF_EWINDOW;
79 ax25_dev->values[AX25_VALUES_T1] = AX25_DEF_T1;
80 ax25_dev->values[AX25_VALUES_T2] = AX25_DEF_T2;
81 ax25_dev->values[AX25_VALUES_T3] = AX25_DEF_T3;
82 ax25_dev->values[AX25_VALUES_IDLE] = AX25_DEF_IDLE;
83 ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2;
84 ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN;
85 ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL;
86 ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT;
87
88#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
89 init_timer(&ax25_dev->dama.slave_timer);
90#endif
91
92 spin_lock_bh(&ax25_dev_lock);
93 ax25_dev->next = ax25_dev_list;
94 ax25_dev_list = ax25_dev;
95 spin_unlock_bh(&ax25_dev_lock);
96
97 ax25_register_sysctl();
98}
99
100void ax25_dev_device_down(struct net_device *dev)
101{
102 ax25_dev *s, *ax25_dev;
103
104 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
105 return;
106
107 ax25_unregister_sysctl();
108
109 spin_lock_bh(&ax25_dev_lock);
110
111#ifdef CONFIG_AX25_DAMA_SLAVE
112 ax25_ds_del_timer(ax25_dev);
113#endif
114
115 /*
116 * Remove any packet forwarding that points to this device.
117 */
118 for (s = ax25_dev_list; s != NULL; s = s->next)
119 if (s->forward == dev)
120 s->forward = NULL;
121
122 if ((s = ax25_dev_list) == ax25_dev) {
123 ax25_dev_list = s->next;
124 spin_unlock_bh(&ax25_dev_lock);
125 dev_put(dev);
126 kfree(ax25_dev);
127 ax25_register_sysctl();
128 return;
129 }
130
131 while (s != NULL && s->next != NULL) {
132 if (s->next == ax25_dev) {
133 s->next = ax25_dev->next;
134 spin_unlock_bh(&ax25_dev_lock);
135 dev_put(dev);
136 kfree(ax25_dev);
137 ax25_register_sysctl();
138 return;
139 }
140
141 s = s->next;
142 }
143 spin_unlock_bh(&ax25_dev_lock);
144 dev->ax25_ptr = NULL;
145
146 ax25_register_sysctl();
147}
148
149int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd)
150{
151 ax25_dev *ax25_dev, *fwd_dev;
152
153 if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL)
154 return -EINVAL;
155
156 switch (cmd) {
157 case SIOCAX25ADDFWD:
158 if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL)
159 return -EINVAL;
160 if (ax25_dev->forward != NULL)
161 return -EINVAL;
162 ax25_dev->forward = fwd_dev->dev;
163 break;
164
165 case SIOCAX25DELFWD:
166 if (ax25_dev->forward == NULL)
167 return -EINVAL;
168 ax25_dev->forward = NULL;
169 break;
170
171 default:
172 return -EINVAL;
173 }
174
175 return 0;
176}
177
178struct net_device *ax25_fwd_dev(struct net_device *dev)
179{
180 ax25_dev *ax25_dev;
181
182 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
183 return dev;
184
185 if (ax25_dev->forward == NULL)
186 return dev;
187
188 return ax25_dev->forward;
189}
190
191/*
192 * Free all memory associated with device structures.
193 */
194void __exit ax25_dev_free(void)
195{
196 ax25_dev *s, *ax25_dev;
197
198 spin_lock_bh(&ax25_dev_lock);
199 ax25_dev = ax25_dev_list;
200 while (ax25_dev != NULL) {
201 s = ax25_dev;
202 dev_put(ax25_dev->dev);
203 ax25_dev = ax25_dev->next;
204 kfree(s);
205 }
206 ax25_dev_list = NULL;
207 spin_unlock_bh(&ax25_dev_lock);
208}