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5beef3c9 AL |
1 | /* |
2 | * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: | |
3 | * | |
4 | * Marek Lindner, Simon Wunderlich | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "main.h" | |
23 | #include "proc.h" | |
5beef3c9 AL |
24 | #include "routing.h" |
25 | #include "send.h" | |
8a2e042c | 26 | #include "originator.h" |
5beef3c9 AL |
27 | #include "soft-interface.h" |
28 | #include "device.h" | |
29 | #include "translation-table.h" | |
30 | #include "hard-interface.h" | |
31 | #include "types.h" | |
32 | #include "vis.h" | |
33 | #include "hash.h" | |
34 | #include "compat.h" | |
35 | ||
36 | struct list_head if_list; | |
37 | struct hlist_head forw_bat_list; | |
38 | struct hlist_head forw_bcast_list; | |
39 | struct hashtable_t *orig_hash; | |
40 | ||
41 | DEFINE_SPINLOCK(orig_hash_lock); | |
42 | DEFINE_SPINLOCK(forw_bat_list_lock); | |
43 | DEFINE_SPINLOCK(forw_bcast_list_lock); | |
44 | ||
45 | atomic_t originator_interval; | |
46 | atomic_t vis_interval; | |
47 | atomic_t aggregation_enabled; | |
48 | int16_t num_hna; | |
49 | int16_t num_ifs; | |
50 | ||
51 | struct net_device *soft_device; | |
52 | ||
53 | static struct task_struct *kthread_task; | |
54 | ||
55 | unsigned char broadcastAddr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; | |
56 | atomic_t module_state; | |
57 | ||
58 | struct workqueue_struct *bat_event_workqueue; | |
59 | ||
bad2239e AL |
60 | #ifdef CONFIG_BATMAN_DEBUG |
61 | int debug; | |
62 | ||
63 | module_param(debug, int, 0644); | |
64 | ||
65 | int bat_debug_type(int type) | |
66 | { | |
67 | return debug & type; | |
68 | } | |
69 | #endif | |
70 | ||
5beef3c9 AL |
71 | int init_module(void) |
72 | { | |
73 | int retval; | |
74 | ||
75 | INIT_LIST_HEAD(&if_list); | |
76 | INIT_HLIST_HEAD(&forw_bat_list); | |
77 | INIT_HLIST_HEAD(&forw_bcast_list); | |
78 | ||
79 | atomic_set(&module_state, MODULE_INACTIVE); | |
80 | ||
81 | atomic_set(&originator_interval, 1000); | |
82 | atomic_set(&vis_interval, 1000);/* TODO: raise this later, this is only | |
83 | * for debugging now. */ | |
84 | atomic_set(&aggregation_enabled, 1); | |
85 | ||
86 | /* the name should not be longer than 10 chars - see | |
87 | * http://lwn.net/Articles/23634/ */ | |
88 | bat_event_workqueue = create_singlethread_workqueue("bat_events"); | |
89 | ||
90 | if (!bat_event_workqueue) | |
91 | return -ENOMEM; | |
92 | ||
93 | retval = setup_procfs(); | |
94 | if (retval < 0) | |
95 | return retval; | |
96 | ||
97 | bat_device_init(); | |
98 | ||
99 | /* initialize layer 2 interface */ | |
100 | soft_device = alloc_netdev(sizeof(struct bat_priv) , "bat%d", | |
101 | interface_setup); | |
102 | ||
103 | if (!soft_device) { | |
bad2239e | 104 | printk(KERN_ERR "batman-adv:Unable to allocate the batman interface\n"); |
5beef3c9 AL |
105 | goto end; |
106 | } | |
107 | ||
108 | retval = register_netdev(soft_device); | |
109 | ||
110 | if (retval < 0) { | |
bad2239e | 111 | printk(KERN_ERR "batman-adv:Unable to register the batman interface: %i\n", retval); |
5beef3c9 AL |
112 | goto free_soft_device; |
113 | } | |
114 | ||
115 | register_netdevice_notifier(&hard_if_notifier); | |
116 | ||
bad2239e AL |
117 | printk(KERN_INFO "batman-adv:B.A.T.M.A.N. advanced %s%s (compatibility version %i) loaded \n", |
118 | SOURCE_VERSION, REVISION_VERSION_STR, COMPAT_VERSION); | |
5beef3c9 AL |
119 | |
120 | return 0; | |
121 | ||
122 | free_soft_device: | |
123 | free_netdev(soft_device); | |
124 | soft_device = NULL; | |
125 | end: | |
126 | return -ENOMEM; | |
127 | } | |
128 | ||
129 | void cleanup_module(void) | |
130 | { | |
131 | shutdown_module(); | |
132 | ||
133 | if (soft_device) { | |
134 | unregister_netdev(soft_device); | |
135 | soft_device = NULL; | |
136 | } | |
137 | ||
138 | unregister_netdevice_notifier(&hard_if_notifier); | |
139 | cleanup_procfs(); | |
140 | ||
141 | destroy_workqueue(bat_event_workqueue); | |
142 | bat_event_workqueue = NULL; | |
143 | } | |
144 | ||
145 | /* activates the module, creates bat device, starts timer ... */ | |
146 | void activate_module(void) | |
147 | { | |
148 | if (originator_init() < 1) | |
149 | goto err; | |
150 | ||
151 | if (hna_local_init() < 1) | |
152 | goto err; | |
153 | ||
154 | if (hna_global_init() < 1) | |
155 | goto err; | |
156 | ||
157 | hna_local_add(soft_device->dev_addr); | |
158 | ||
159 | if (bat_device_setup() < 1) | |
160 | goto end; | |
161 | ||
162 | if (vis_init() < 1) | |
163 | goto err; | |
164 | ||
165 | /* (re)start kernel thread for packet processing */ | |
166 | if (!kthread_task) { | |
167 | kthread_task = kthread_run(packet_recv_thread, NULL, "batman-adv"); | |
168 | ||
169 | if (IS_ERR(kthread_task)) { | |
bad2239e | 170 | printk(KERN_ERR "batman-adv:Unable to start packet receive thread\n"); |
5beef3c9 AL |
171 | kthread_task = NULL; |
172 | } | |
173 | } | |
174 | ||
175 | update_min_mtu(); | |
176 | atomic_set(&module_state, MODULE_ACTIVE); | |
177 | goto end; | |
178 | ||
179 | err: | |
bad2239e | 180 | printk(KERN_ERR "batman-adv:Unable to allocate memory for mesh information structures: out of mem ?\n"); |
5beef3c9 AL |
181 | shutdown_module(); |
182 | end: | |
183 | return; | |
184 | } | |
185 | ||
186 | /* shuts down the whole module.*/ | |
187 | void shutdown_module(void) | |
188 | { | |
189 | atomic_set(&module_state, MODULE_DEACTIVATING); | |
190 | ||
191 | purge_outstanding_packets(); | |
192 | flush_workqueue(bat_event_workqueue); | |
193 | ||
194 | vis_quit(); | |
195 | ||
196 | /* deactivate kernel thread for packet processing (if running) */ | |
197 | if (kthread_task) { | |
198 | atomic_set(&exit_cond, 1); | |
199 | wake_up_interruptible(&thread_wait); | |
200 | kthread_stop(kthread_task); | |
201 | ||
202 | kthread_task = NULL; | |
203 | } | |
204 | ||
205 | originator_free(); | |
206 | ||
207 | hna_local_free(); | |
208 | hna_global_free(); | |
209 | ||
210 | synchronize_net(); | |
211 | bat_device_destroy(); | |
212 | ||
213 | hardif_remove_interfaces(); | |
214 | synchronize_rcu(); | |
215 | atomic_set(&module_state, MODULE_INACTIVE); | |
216 | } | |
217 | ||
218 | void inc_module_count(void) | |
219 | { | |
220 | try_module_get(THIS_MODULE); | |
221 | } | |
222 | ||
223 | void dec_module_count(void) | |
224 | { | |
225 | module_put(THIS_MODULE); | |
226 | } | |
227 | ||
228 | int addr_to_string(char *buff, uint8_t *addr) | |
229 | { | |
230 | return sprintf(buff, "%02x:%02x:%02x:%02x:%02x:%02x", | |
231 | addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); | |
232 | } | |
233 | ||
234 | /* returns 1 if they are the same originator */ | |
235 | ||
236 | int compare_orig(void *data1, void *data2) | |
237 | { | |
238 | return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); | |
239 | } | |
240 | ||
241 | /* hashfunction to choose an entry in a hash table of given size */ | |
242 | /* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */ | |
243 | int choose_orig(void *data, int32_t size) | |
244 | { | |
245 | unsigned char *key = data; | |
246 | uint32_t hash = 0; | |
247 | size_t i; | |
248 | ||
249 | for (i = 0; i < 6; i++) { | |
250 | hash += key[i]; | |
251 | hash += (hash << 10); | |
252 | hash ^= (hash >> 6); | |
253 | } | |
254 | ||
255 | hash += (hash << 3); | |
256 | hash ^= (hash >> 11); | |
257 | hash += (hash << 15); | |
258 | ||
259 | return hash % size; | |
260 | } | |
261 | ||
262 | int is_my_mac(uint8_t *addr) | |
263 | { | |
264 | struct batman_if *batman_if; | |
265 | rcu_read_lock(); | |
266 | list_for_each_entry_rcu(batman_if, &if_list, list) { | |
267 | if ((batman_if->net_dev) && | |
268 | (compare_orig(batman_if->net_dev->dev_addr, addr))) { | |
269 | rcu_read_unlock(); | |
270 | return 1; | |
271 | } | |
272 | } | |
273 | rcu_read_unlock(); | |
274 | return 0; | |
275 | ||
276 | } | |
277 | ||
278 | int is_bcast(uint8_t *addr) | |
279 | { | |
280 | return (addr[0] == (uint8_t)0xff) && (addr[1] == (uint8_t)0xff); | |
281 | } | |
282 | ||
283 | int is_mcast(uint8_t *addr) | |
284 | { | |
285 | return *addr & 0x01; | |
286 | } | |
287 | ||
288 | MODULE_LICENSE("GPL"); | |
289 | ||
290 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
291 | MODULE_DESCRIPTION(DRIVER_DESC); | |
292 | MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE); | |
293 | #ifdef REVISION_VERSION | |
294 | MODULE_VERSION(SOURCE_VERSION "-" REVISION_VERSION); | |
295 | #else | |
296 | MODULE_VERSION(SOURCE_VERSION); | |
297 | #endif |