Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / 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/errno.h>
10 #include <linux/types.h>
11 #include <linux/socket.h>
12 #include <linux/slab.h>
13 #include <linux/in.h>
14 #include <linux/kernel.h>
15 #include <linux/timer.h>
16 #include <linux/string.h>
17 #include <linux/sockios.h>
18 #include <linux/net.h>
19 #include <linux/spinlock.h>
20 #include <net/ax25.h>
21 #include <linux/inet.h>
22 #include <linux/netdevice.h>
23 #include <linux/if_arp.h>
24 #include <linux/skbuff.h>
25 #include <net/sock.h>
26 #include <asm/uaccess.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         dev->ax25_ptr     = ax25_dev;
63         ax25_dev->dev     = dev;
64         dev_hold(dev);
65         ax25_dev->forward = NULL;
66
67         ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE;
68         ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE;
69         ax25_dev->values[AX25_VALUES_BACKOFF]   = AX25_DEF_BACKOFF;
70         ax25_dev->values[AX25_VALUES_CONMODE]   = AX25_DEF_CONMODE;
71         ax25_dev->values[AX25_VALUES_WINDOW]    = AX25_DEF_WINDOW;
72         ax25_dev->values[AX25_VALUES_EWINDOW]   = AX25_DEF_EWINDOW;
73         ax25_dev->values[AX25_VALUES_T1]        = AX25_DEF_T1;
74         ax25_dev->values[AX25_VALUES_T2]        = AX25_DEF_T2;
75         ax25_dev->values[AX25_VALUES_T3]        = AX25_DEF_T3;
76         ax25_dev->values[AX25_VALUES_IDLE]      = AX25_DEF_IDLE;
77         ax25_dev->values[AX25_VALUES_N2]        = AX25_DEF_N2;
78         ax25_dev->values[AX25_VALUES_PACLEN]    = AX25_DEF_PACLEN;
79         ax25_dev->values[AX25_VALUES_PROTOCOL]  = AX25_DEF_PROTOCOL;
80         ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT;
81
82 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
83         ax25_ds_setup_timer(ax25_dev);
84 #endif
85
86         spin_lock_bh(&ax25_dev_lock);
87         ax25_dev->next = ax25_dev_list;
88         ax25_dev_list  = ax25_dev;
89         spin_unlock_bh(&ax25_dev_lock);
90
91         ax25_register_dev_sysctl(ax25_dev);
92 }
93
94 void ax25_dev_device_down(struct net_device *dev)
95 {
96         ax25_dev *s, *ax25_dev;
97
98         if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
99                 return;
100
101         ax25_unregister_dev_sysctl(ax25_dev);
102
103         spin_lock_bh(&ax25_dev_lock);
104
105 #ifdef CONFIG_AX25_DAMA_SLAVE
106         ax25_ds_del_timer(ax25_dev);
107 #endif
108
109         /*
110          *      Remove any packet forwarding that points to this device.
111          */
112         for (s = ax25_dev_list; s != NULL; s = s->next)
113                 if (s->forward == dev)
114                         s->forward = NULL;
115
116         if ((s = ax25_dev_list) == ax25_dev) {
117                 ax25_dev_list = s->next;
118                 spin_unlock_bh(&ax25_dev_lock);
119                 dev_put(dev);
120                 kfree(ax25_dev);
121                 return;
122         }
123
124         while (s != NULL && s->next != NULL) {
125                 if (s->next == ax25_dev) {
126                         s->next = ax25_dev->next;
127                         spin_unlock_bh(&ax25_dev_lock);
128                         dev_put(dev);
129                         kfree(ax25_dev);
130                         return;
131                 }
132
133                 s = s->next;
134         }
135         spin_unlock_bh(&ax25_dev_lock);
136         dev->ax25_ptr = NULL;
137 }
138
139 int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd)
140 {
141         ax25_dev *ax25_dev, *fwd_dev;
142
143         if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL)
144                 return -EINVAL;
145
146         switch (cmd) {
147         case SIOCAX25ADDFWD:
148                 if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL)
149                         return -EINVAL;
150                 if (ax25_dev->forward != NULL)
151                         return -EINVAL;
152                 ax25_dev->forward = fwd_dev->dev;
153                 break;
154
155         case SIOCAX25DELFWD:
156                 if (ax25_dev->forward == NULL)
157                         return -EINVAL;
158                 ax25_dev->forward = NULL;
159                 break;
160
161         default:
162                 return -EINVAL;
163         }
164
165         return 0;
166 }
167
168 struct net_device *ax25_fwd_dev(struct net_device *dev)
169 {
170         ax25_dev *ax25_dev;
171
172         if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
173                 return dev;
174
175         if (ax25_dev->forward == NULL)
176                 return dev;
177
178         return ax25_dev->forward;
179 }
180
181 /*
182  *      Free all memory associated with device structures.
183  */
184 void __exit ax25_dev_free(void)
185 {
186         ax25_dev *s, *ax25_dev;
187
188         spin_lock_bh(&ax25_dev_lock);
189         ax25_dev = ax25_dev_list;
190         while (ax25_dev != NULL) {
191                 s        = ax25_dev;
192                 dev_put(ax25_dev->dev);
193                 ax25_dev = ax25_dev->next;
194                 kfree(s);
195         }
196         ax25_dev_list = NULL;
197         spin_unlock_bh(&ax25_dev_lock);
198 }