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
32ax25_dev *ax25_dev_list;
33DEFINE_SPINLOCK(ax25_dev_lock);
34
35ax25_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 */
53void 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	init_timer(&ax25_dev->dama.slave_timer);
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
96void 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
145int 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
174struct 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 */
190void __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