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/timer.h>
15 #include <linux/string.h>
16 #include <linux/sockios.h>
17 #include <linux/net.h>
18 #include <linux/spinlock.h>
19 #include <net/ax25.h>
20 #include <linux/inet.h>
21 #include <linux/netdevice.h>
22 #include <linux/if_arp.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 #include <linux/init.h>
31
32 ax25_dev *ax25_dev_list;
33 DEFINE_SPINLOCK(ax25_dev_lock);
34
35 ax25_dev *ax25_addr_ax25dev(ax25_address *addr)
36 {
37 ax25_dev *ax25_dev, *res = NULL;
38
39 spin_lock_bh(&ax25_dev_lock);
40 for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
41 if (ax25cmp(addr, (ax25_address *)ax25_dev->dev->dev_addr) == 0) {
42 res = ax25_dev;
43 }
44 spin_unlock_bh(&ax25_dev_lock);
45
46 return res;
47 }
48
49 /*
50 * This is called when an interface is brought up. These are
51 * reasonable defaults.
52 */
53 void ax25_dev_device_up(struct net_device *dev)
54 {
55 ax25_dev *ax25_dev;
56
57 if ((ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) {
58 printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n");
59 return;
60 }
61
62 ax25_unregister_sysctl();
63
64 dev->ax25_ptr = ax25_dev;
65 ax25_dev->dev = dev;
66 dev_hold(dev);
67 ax25_dev->forward = NULL;
68
69 ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE;
70 ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE;
71 ax25_dev->values[AX25_VALUES_BACKOFF] = AX25_DEF_BACKOFF;
72 ax25_dev->values[AX25_VALUES_CONMODE] = AX25_DEF_CONMODE;
73 ax25_dev->values[AX25_VALUES_WINDOW] = AX25_DEF_WINDOW;
74 ax25_dev->values[AX25_VALUES_EWINDOW] = AX25_DEF_EWINDOW;
75 ax25_dev->values[AX25_VALUES_T1] = AX25_DEF_T1;
76 ax25_dev->values[AX25_VALUES_T2] = AX25_DEF_T2;
77 ax25_dev->values[AX25_VALUES_T3] = AX25_DEF_T3;
78 ax25_dev->values[AX25_VALUES_IDLE] = AX25_DEF_IDLE;
79 ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2;
80 ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN;
81 ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL;
82 ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT;
83
84 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
85 ax25_ds_setup_timer(ax25_dev);
86 #endif
87
88 spin_lock_bh(&ax25_dev_lock);
89 ax25_dev->next = ax25_dev_list;
90 ax25_dev_list = ax25_dev;
91 spin_unlock_bh(&ax25_dev_lock);
92
93 ax25_register_sysctl();
94 }
95
96 void ax25_dev_device_down(struct net_device *dev)
97 {
98 ax25_dev *s, *ax25_dev;
99
100 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
101 return;
102
103 ax25_unregister_sysctl();
104
105 spin_lock_bh(&ax25_dev_lock);
106
107 #ifdef CONFIG_AX25_DAMA_SLAVE
108 ax25_ds_del_timer(ax25_dev);
109 #endif
110
111 /*
112 * Remove any packet forwarding that points to this device.
113 */
114 for (s = ax25_dev_list; s != NULL; s = s->next)
115 if (s->forward == dev)
116 s->forward = NULL;
117
118 if ((s = ax25_dev_list) == ax25_dev) {
119 ax25_dev_list = s->next;
120 spin_unlock_bh(&ax25_dev_lock);
121 dev_put(dev);
122 kfree(ax25_dev);
123 ax25_register_sysctl();
124 return;
125 }
126
127 while (s != NULL && s->next != NULL) {
128 if (s->next == ax25_dev) {
129 s->next = ax25_dev->next;
130 spin_unlock_bh(&ax25_dev_lock);
131 dev_put(dev);
132 kfree(ax25_dev);
133 ax25_register_sysctl();
134 return;
135 }
136
137 s = s->next;
138 }
139 spin_unlock_bh(&ax25_dev_lock);
140 dev->ax25_ptr = NULL;
141
142 ax25_register_sysctl();
143 }
144
145 int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd)
146 {
147 ax25_dev *ax25_dev, *fwd_dev;
148
149 if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL)
150 return -EINVAL;
151
152 switch (cmd) {
153 case SIOCAX25ADDFWD:
154 if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL)
155 return -EINVAL;
156 if (ax25_dev->forward != NULL)
157 return -EINVAL;
158 ax25_dev->forward = fwd_dev->dev;
159 break;
160
161 case SIOCAX25DELFWD:
162 if (ax25_dev->forward == NULL)
163 return -EINVAL;
164 ax25_dev->forward = NULL;
165 break;
166
167 default:
168 return -EINVAL;
169 }
170
171 return 0;
172 }
173
174 struct net_device *ax25_fwd_dev(struct net_device *dev)
175 {
176 ax25_dev *ax25_dev;
177
178 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
179 return dev;
180
181 if (ax25_dev->forward == NULL)
182 return dev;
183
184 return ax25_dev->forward;
185 }
186
187 /*
188 * Free all memory associated with device structures.
189 */
190 void __exit ax25_dev_free(void)
191 {
192 ax25_dev *s, *ax25_dev;
193
194 spin_lock_bh(&ax25_dev_lock);
195 ax25_dev = ax25_dev_list;
196 while (ax25_dev != NULL) {
197 s = ax25_dev;
198 dev_put(ax25_dev->dev);
199 ax25_dev = ax25_dev->next;
200 kfree(s);
201 }
202 ax25_dev_list = NULL;
203 spin_unlock_bh(&ax25_dev_lock);
204 }
205
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