[NETFILTER]: Fix warnings in ip_nat_snmp_basic.c
[linux-2.6] / net / ax25 / ax25_dev.c
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/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
34 ax25_dev *ax25_dev_list;
35 DEFINE_SPINLOCK(ax25_dev_lock);
36
37 ax25_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  */
55 void 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
100 void 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
149 int 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
178 struct 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  */
194 void __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 }