1 /*
2 * AX.25 release 037
3 *
4 * This code REQUIRES 2.1.15 or higher/ NET3.038
5 *
6 * This module:
7 * This module is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 *
12 * Other kernels modules in this kit are generally BSD derived. See the copyright headers.
13 *
14 *
15 * History
16 * AX.25 036 Jonathan(G4KLX) Split from ax25_route.c.
17 */
18
19 #include <linux/config.h>
20 #include <linux/errno.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/in.h>
24 #include <linux/kernel.h>
25 #include <linux/sched.h>
26 #include <linux/timer.h>
27 #include <linux/string.h>
28 #include <linux/sockios.h>
29 #include <linux/net.h>
30 #include <net/ax25.h>
31 #include <linux/inet.h>
32 #include <linux/netdevice.h>
33 #include <linux/if_arp.h>
34 #include <linux/skbuff.h>
35 #include <net/sock.h>
36 #include <asm/uaccess.h>
37 #include <asm/system.h>
38 #include <linux/fcntl.h>
39 #include <linux/mm.h>
40 #include <linux/interrupt.h>
41 #include <linux/init.h>
42
43 ax25_dev *ax25_dev_list;
44
45 ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
46 {
47 ax25_dev *ax25_dev;
48
49 for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
50 if (ax25_dev->dev == dev)
51 return ax25_dev;
52
53 return NULL;
54 }
55
56 ax25_dev *ax25_addr_ax25dev(ax25_address *addr)
57 {
58 ax25_dev *ax25_dev;
59
60 for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
61 if (ax25cmp(addr, (ax25_address *)ax25_dev->dev->dev_addr) == 0)
62 return ax25_dev;
63
64 return NULL;
65 }
66
67 /*
68 * This is called when an interface is brought up. These are
69 * reasonable defaults.
70 */
71 void ax25_dev_device_up(struct net_device *dev)
72 {
73 ax25_dev *ax25_dev;
74 unsigned long flags;
75
76 if ((ax25_dev = kmalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) {
77 printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n");
78 return;
79 }
80
81 ax25_unregister_sysctl();
82
83 memset(ax25_dev, 0x00, sizeof(*ax25_dev));
84
85 ax25_dev->dev = dev;
86 ax25_dev->forward = NULL;
87
88 ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE;
89 ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE;
90 ax25_dev->values[AX25_VALUES_BACKOFF] = AX25_DEF_BACKOFF;
91 ax25_dev->values[AX25_VALUES_CONMODE] = AX25_DEF_CONMODE;
92 ax25_dev->values[AX25_VALUES_WINDOW] = AX25_DEF_WINDOW;
93 ax25_dev->values[AX25_VALUES_EWINDOW] = AX25_DEF_EWINDOW;
94 ax25_dev->values[AX25_VALUES_T1] = AX25_DEF_T1;
95 ax25_dev->values[AX25_VALUES_T2] = AX25_DEF_T2;
96 ax25_dev->values[AX25_VALUES_T3] = AX25_DEF_T3;
97 ax25_dev->values[AX25_VALUES_IDLE] = AX25_DEF_IDLE;
98 ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2;
99 ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN;
100 ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL;
101 ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT;
102
103 save_flags(flags); cli();
104 ax25_dev->next = ax25_dev_list;
105 ax25_dev_list = ax25_dev;
106 restore_flags(flags);
107
108 ax25_register_sysctl();
109 }
110
111 void ax25_dev_device_down(struct net_device *dev)
112 {
113 ax25_dev *s, *ax25_dev;
114 unsigned long flags;
115
116 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
117 return;
118
119 ax25_unregister_sysctl();
120
121 save_flags(flags); cli();
122
123 #ifdef CONFIG_AX25_DAMA_SLAVE
124 ax25_ds_del_timer(ax25_dev);
125 #endif
126
127 /*
128 * Remove any packet forwarding that points to this device.
129 */
130 for (s = ax25_dev_list; s != NULL; s = s->next)
131 if (s->forward == dev)
132 s->forward = NULL;
133
134 if ((s = ax25_dev_list) == ax25_dev) {
135 ax25_dev_list = s->next;
136 restore_flags(flags);
137 kfree(ax25_dev);
138 ax25_register_sysctl();
139 return;
140 }
141
142 while (s != NULL && s->next != NULL) {
143 if (s->next == ax25_dev) {
144 s->next = ax25_dev->next;
145 restore_flags(flags);
146 kfree(ax25_dev);
147 ax25_register_sysctl();
148 return;
149 }
150
151 s = s->next;
152 }
153
154 restore_flags(flags);
155 ax25_register_sysctl();
156 }
157
158 int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd)
159 {
160 ax25_dev *ax25_dev, *fwd_dev;
161
162 if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL)
163 return -EINVAL;
164
165 switch (cmd) {
166 case SIOCAX25ADDFWD:
167 if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL)
168 return -EINVAL;
169 if (ax25_dev->forward != NULL)
170 return -EINVAL;
171 ax25_dev->forward = fwd_dev->dev;
172 break;
173
174 case SIOCAX25DELFWD:
175 if (ax25_dev->forward == NULL)
176 return -EINVAL;
177 ax25_dev->forward = NULL;
178 break;
179
180 default:
181 return -EINVAL;
182 }
183
184 return 0;
185 }
186
187 struct net_device *ax25_fwd_dev(struct net_device *dev)
188 {
189 ax25_dev *ax25_dev;
190
191 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
192 return dev;
193
194 if (ax25_dev->forward == NULL)
195 return dev;
196
197 return ax25_dev->forward;
198 }
199
200 /*
201 * Free all memory associated with device structures.
202 */
203 void __exit ax25_dev_free(void)
204 {
205 ax25_dev *s, *ax25_dev = ax25_dev_list;
206
207 while (ax25_dev != NULL) {
208 s = ax25_dev;
209 ax25_dev = ax25_dev->next;
210
211 kfree(s);
212 }
213 }
214
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