aboutsummaryrefslogtreecommitdiff
path: root/drivers/staging/batman-adv/main.c
blob: bb89bfc5dda618d766072639e2dd500940f797dc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
/*
 * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors:
 *
 * Marek Lindner, Simon Wunderlich
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 *
 */

#include "main.h"
#include "proc.h"
#include "log.h"
#include "routing.h"
#include "send.h"
#include "soft-interface.h"
#include "device.h"
#include "translation-table.h"
#include "hard-interface.h"
#include "types.h"
#include "vis.h"
#include "hash.h"
#include "compat.h"

struct list_head if_list;
struct hlist_head forw_bat_list;
struct hlist_head forw_bcast_list;
struct hashtable_t *orig_hash;

DEFINE_SPINLOCK(orig_hash_lock);
DEFINE_SPINLOCK(forw_bat_list_lock);
DEFINE_SPINLOCK(forw_bcast_list_lock);

atomic_t originator_interval;
atomic_t vis_interval;
atomic_t aggregation_enabled;
int16_t num_hna;
int16_t num_ifs;

struct net_device *soft_device;

static struct task_struct *kthread_task;

unsigned char broadcastAddr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
atomic_t module_state;

struct workqueue_struct *bat_event_workqueue;

int init_module(void)
{
	int retval;

	INIT_LIST_HEAD(&if_list);
	INIT_HLIST_HEAD(&forw_bat_list);
	INIT_HLIST_HEAD(&forw_bcast_list);

	atomic_set(&module_state, MODULE_INACTIVE);

	atomic_set(&originator_interval, 1000);
	atomic_set(&vis_interval, 1000);/* TODO: raise this later, this is only
					 * for debugging now. */
	atomic_set(&aggregation_enabled, 1);

	/* the name should not be longer than 10 chars - see
	 * http://lwn.net/Articles/23634/ */
	bat_event_workqueue = create_singlethread_workqueue("bat_events");

	if (!bat_event_workqueue)
		return -ENOMEM;

	retval = setup_procfs();
	if (retval < 0)
		return retval;

	bat_device_init();

	/* initialize layer 2 interface */
	soft_device = alloc_netdev(sizeof(struct bat_priv) , "bat%d",
				   interface_setup);

	if (!soft_device) {
		debug_log(LOG_TYPE_CRIT, "Unable to allocate the batman interface\n");
		goto end;
	}

	retval = register_netdev(soft_device);

	if (retval < 0) {
		debug_log(LOG_TYPE_CRIT, "Unable to register the batman interface: %i\n", retval);
		goto free_soft_device;
	}

	register_netdevice_notifier(&hard_if_notifier);

	debug_log(LOG_TYPE_CRIT, "B.A.T.M.A.N. advanced %s%s (compatibility version %i) loaded \n",
	          SOURCE_VERSION, REVISION_VERSION_STR, COMPAT_VERSION);

	return 0;

free_soft_device:
	free_netdev(soft_device);
	soft_device = NULL;
end:
	return -ENOMEM;
}

void cleanup_module(void)
{
	shutdown_module();

	if (soft_device) {
		unregister_netdev(soft_device);
		soft_device = NULL;
	}

	unregister_netdevice_notifier(&hard_if_notifier);
	cleanup_procfs();

	destroy_workqueue(bat_event_workqueue);
	bat_event_workqueue = NULL;
}

/* activates the module, creates bat device, starts timer ... */
void activate_module(void)
{
	if (originator_init() < 1)
		goto err;

	if (hna_local_init() < 1)
		goto err;

	if (hna_global_init() < 1)
		goto err;

	hna_local_add(soft_device->dev_addr);

	if (bat_device_setup() < 1)
		goto end;

	if (vis_init() < 1)
		goto err;

	/* (re)start kernel thread for packet processing */
	if (!kthread_task) {
		kthread_task = kthread_run(packet_recv_thread, NULL, "batman-adv");

		if (IS_ERR(kthread_task)) {
			debug_log(LOG_TYPE_CRIT, "Unable to start packet receive thread\n");
			kthread_task = NULL;
		}
	}

	update_min_mtu();
	atomic_set(&module_state, MODULE_ACTIVE);
	goto end;

err:
	debug_log(LOG_TYPE_CRIT, "Unable to allocate memory for mesh information structures: out of mem ?\n");
	shutdown_module();
end:
	return;
}

/* shuts down the whole module.*/
void shutdown_module(void)
{
	atomic_set(&module_state, MODULE_DEACTIVATING);

	purge_outstanding_packets();
	flush_workqueue(bat_event_workqueue);

	vis_quit();

	/* deactivate kernel thread for packet processing (if running) */
	if (kthread_task) {
		atomic_set(&exit_cond, 1);
		wake_up_interruptible(&thread_wait);
		kthread_stop(kthread_task);

		kthread_task = NULL;
	}

	originator_free();

	hna_local_free();
	hna_global_free();

	synchronize_net();
	bat_device_destroy();

	hardif_remove_interfaces();
	synchronize_rcu();
	atomic_set(&module_state, MODULE_INACTIVE);
}

void inc_module_count(void)
{
	try_module_get(THIS_MODULE);
}

void dec_module_count(void)
{
	module_put(THIS_MODULE);
}

int addr_to_string(char *buff, uint8_t *addr)
{
	return sprintf(buff, "%02x:%02x:%02x:%02x:%02x:%02x",
		       addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
}

/* returns 1 if they are the same originator */

int compare_orig(void *data1, void *data2)
{
	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
}

/* hashfunction to choose an entry in a hash table of given size */
/* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */
int choose_orig(void *data, int32_t size)
{
	unsigned char *key = data;
	uint32_t hash = 0;
	size_t i;

	for (i = 0; i < 6; i++) {
		hash += key[i];
		hash += (hash << 10);
		hash ^= (hash >> 6);
	}

	hash += (hash << 3);
	hash ^= (hash >> 11);
	hash += (hash << 15);

	return hash % size;
}

int is_my_mac(uint8_t *addr)
{
	struct batman_if *batman_if;
	rcu_read_lock();
	list_for_each_entry_rcu(batman_if, &if_list, list) {
		if ((batman_if->net_dev) &&
		    (compare_orig(batman_if->net_dev->dev_addr, addr))) {
			rcu_read_unlock();
			return 1;
		}
	}
	rcu_read_unlock();
	return 0;

}

int is_bcast(uint8_t *addr)
{
	return (addr[0] == (uint8_t)0xff) && (addr[1] == (uint8_t)0xff);
}

int is_mcast(uint8_t *addr)
{
	return *addr & 0x01;
}

MODULE_LICENSE("GPL");

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE);
#ifdef REVISION_VERSION
MODULE_VERSION(SOURCE_VERSION "-" REVISION_VERSION);
#else
MODULE_VERSION(SOURCE_VERSION);
#endif