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Commit | Line | Data |
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c6c8fea2 | 1 | /* |
64afe353 | 2 | * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
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 "translation-table.h" | |
24 | #include "soft-interface.h" | |
32ae9b22 | 25 | #include "hard-interface.h" |
a73105b8 | 26 | #include "send.h" |
c6c8fea2 SE |
27 | #include "hash.h" |
28 | #include "originator.h" | |
a73105b8 | 29 | #include "routing.h" |
c6c8fea2 | 30 | |
a73105b8 AQ |
31 | #include <linux/crc16.h> |
32 | ||
33 | static void _tt_global_del(struct bat_priv *bat_priv, | |
34 | struct tt_global_entry *tt_global_entry, | |
35 | const char *message); | |
36 | static void tt_purge(struct work_struct *work); | |
c6c8fea2 | 37 | |
7aadf889 | 38 | /* returns 1 if they are the same mac addr */ |
747e4221 | 39 | static int compare_ltt(const struct hlist_node *node, const void *data2) |
7aadf889 | 40 | { |
747e4221 SE |
41 | const void *data1 = container_of(node, struct tt_local_entry, |
42 | hash_entry); | |
7aadf889 ML |
43 | |
44 | return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); | |
45 | } | |
46 | ||
47 | /* returns 1 if they are the same mac addr */ | |
747e4221 | 48 | static int compare_gtt(const struct hlist_node *node, const void *data2) |
7aadf889 | 49 | { |
747e4221 SE |
50 | const void *data1 = container_of(node, struct tt_global_entry, |
51 | hash_entry); | |
7aadf889 ML |
52 | |
53 | return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); | |
54 | } | |
55 | ||
a73105b8 | 56 | static void tt_start_timer(struct bat_priv *bat_priv) |
c6c8fea2 | 57 | { |
a73105b8 AQ |
58 | INIT_DELAYED_WORK(&bat_priv->tt_work, tt_purge); |
59 | queue_delayed_work(bat_event_workqueue, &bat_priv->tt_work, | |
60 | msecs_to_jiffies(5000)); | |
c6c8fea2 SE |
61 | } |
62 | ||
2dafb49d | 63 | static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv, |
747e4221 | 64 | const void *data) |
7aadf889 | 65 | { |
2dafb49d | 66 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
7aadf889 ML |
67 | struct hlist_head *head; |
68 | struct hlist_node *node; | |
2dafb49d | 69 | struct tt_local_entry *tt_local_entry, *tt_local_entry_tmp = NULL; |
c90681b8 | 70 | uint32_t index; |
7aadf889 ML |
71 | |
72 | if (!hash) | |
73 | return NULL; | |
74 | ||
75 | index = choose_orig(data, hash->size); | |
76 | head = &hash->table[index]; | |
77 | ||
78 | rcu_read_lock(); | |
2dafb49d AQ |
79 | hlist_for_each_entry_rcu(tt_local_entry, node, head, hash_entry) { |
80 | if (!compare_eth(tt_local_entry, data)) | |
7aadf889 ML |
81 | continue; |
82 | ||
7683fdc1 AQ |
83 | if (!atomic_inc_not_zero(&tt_local_entry->refcount)) |
84 | continue; | |
85 | ||
2dafb49d | 86 | tt_local_entry_tmp = tt_local_entry; |
7aadf889 ML |
87 | break; |
88 | } | |
89 | rcu_read_unlock(); | |
90 | ||
2dafb49d | 91 | return tt_local_entry_tmp; |
7aadf889 ML |
92 | } |
93 | ||
2dafb49d | 94 | static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv, |
747e4221 | 95 | const void *data) |
7aadf889 | 96 | { |
2dafb49d | 97 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
7aadf889 ML |
98 | struct hlist_head *head; |
99 | struct hlist_node *node; | |
2dafb49d AQ |
100 | struct tt_global_entry *tt_global_entry; |
101 | struct tt_global_entry *tt_global_entry_tmp = NULL; | |
c90681b8 | 102 | uint32_t index; |
7aadf889 ML |
103 | |
104 | if (!hash) | |
105 | return NULL; | |
106 | ||
107 | index = choose_orig(data, hash->size); | |
108 | head = &hash->table[index]; | |
109 | ||
110 | rcu_read_lock(); | |
2dafb49d AQ |
111 | hlist_for_each_entry_rcu(tt_global_entry, node, head, hash_entry) { |
112 | if (!compare_eth(tt_global_entry, data)) | |
7aadf889 ML |
113 | continue; |
114 | ||
7683fdc1 AQ |
115 | if (!atomic_inc_not_zero(&tt_global_entry->refcount)) |
116 | continue; | |
117 | ||
2dafb49d | 118 | tt_global_entry_tmp = tt_global_entry; |
7aadf889 ML |
119 | break; |
120 | } | |
121 | rcu_read_unlock(); | |
122 | ||
2dafb49d | 123 | return tt_global_entry_tmp; |
7aadf889 ML |
124 | } |
125 | ||
a73105b8 AQ |
126 | static bool is_out_of_time(unsigned long starting_time, unsigned long timeout) |
127 | { | |
128 | unsigned long deadline; | |
129 | deadline = starting_time + msecs_to_jiffies(timeout); | |
130 | ||
131 | return time_after(jiffies, deadline); | |
132 | } | |
133 | ||
7683fdc1 AQ |
134 | static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry) |
135 | { | |
136 | if (atomic_dec_and_test(&tt_local_entry->refcount)) | |
137 | kfree_rcu(tt_local_entry, rcu); | |
138 | } | |
139 | ||
531027fc SW |
140 | static void tt_global_entry_free_rcu(struct rcu_head *rcu) |
141 | { | |
142 | struct tt_global_entry *tt_global_entry; | |
143 | ||
144 | tt_global_entry = container_of(rcu, struct tt_global_entry, rcu); | |
145 | ||
146 | if (tt_global_entry->orig_node) | |
147 | orig_node_free_ref(tt_global_entry->orig_node); | |
148 | ||
149 | kfree(tt_global_entry); | |
150 | } | |
151 | ||
7683fdc1 AQ |
152 | static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry) |
153 | { | |
154 | if (atomic_dec_and_test(&tt_global_entry->refcount)) | |
531027fc | 155 | call_rcu(&tt_global_entry->rcu, tt_global_entry_free_rcu); |
7683fdc1 AQ |
156 | } |
157 | ||
ff66c975 AQ |
158 | static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr, |
159 | uint8_t flags) | |
a73105b8 AQ |
160 | { |
161 | struct tt_change_node *tt_change_node; | |
162 | ||
163 | tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC); | |
164 | ||
165 | if (!tt_change_node) | |
166 | return; | |
167 | ||
ff66c975 | 168 | tt_change_node->change.flags = flags; |
a73105b8 AQ |
169 | memcpy(tt_change_node->change.addr, addr, ETH_ALEN); |
170 | ||
171 | spin_lock_bh(&bat_priv->tt_changes_list_lock); | |
172 | /* track the change in the OGMinterval list */ | |
173 | list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list); | |
174 | atomic_inc(&bat_priv->tt_local_changes); | |
175 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); | |
176 | ||
177 | atomic_set(&bat_priv->tt_ogm_append_cnt, 0); | |
178 | } | |
179 | ||
180 | int tt_len(int changes_num) | |
181 | { | |
182 | return changes_num * sizeof(struct tt_change); | |
183 | } | |
184 | ||
185 | static int tt_local_init(struct bat_priv *bat_priv) | |
c6c8fea2 | 186 | { |
2dafb49d | 187 | if (bat_priv->tt_local_hash) |
c6c8fea2 SE |
188 | return 1; |
189 | ||
2dafb49d | 190 | bat_priv->tt_local_hash = hash_new(1024); |
c6c8fea2 | 191 | |
2dafb49d | 192 | if (!bat_priv->tt_local_hash) |
c6c8fea2 SE |
193 | return 0; |
194 | ||
c6c8fea2 SE |
195 | return 1; |
196 | } | |
197 | ||
bc279080 AQ |
198 | void tt_local_add(struct net_device *soft_iface, const uint8_t *addr, |
199 | int ifindex) | |
c6c8fea2 SE |
200 | { |
201 | struct bat_priv *bat_priv = netdev_priv(soft_iface); | |
7683fdc1 AQ |
202 | struct tt_local_entry *tt_local_entry = NULL; |
203 | struct tt_global_entry *tt_global_entry = NULL; | |
c6c8fea2 | 204 | |
2dafb49d | 205 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
c6c8fea2 | 206 | |
2dafb49d AQ |
207 | if (tt_local_entry) { |
208 | tt_local_entry->last_seen = jiffies; | |
7683fdc1 | 209 | goto out; |
c6c8fea2 SE |
210 | } |
211 | ||
704509b8 | 212 | tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC); |
2dafb49d | 213 | if (!tt_local_entry) |
7683fdc1 | 214 | goto out; |
a73105b8 | 215 | |
a73105b8 AQ |
216 | bat_dbg(DBG_TT, bat_priv, |
217 | "Creating new local tt entry: %pM (ttvn: %d)\n", addr, | |
218 | (uint8_t)atomic_read(&bat_priv->ttvn)); | |
c6c8fea2 | 219 | |
2dafb49d AQ |
220 | memcpy(tt_local_entry->addr, addr, ETH_ALEN); |
221 | tt_local_entry->last_seen = jiffies; | |
5fbc1598 | 222 | tt_local_entry->flags = NO_FLAGS; |
bc279080 AQ |
223 | if (is_wifi_iface(ifindex)) |
224 | tt_local_entry->flags |= TT_CLIENT_WIFI; | |
7683fdc1 | 225 | atomic_set(&tt_local_entry->refcount, 2); |
c6c8fea2 SE |
226 | |
227 | /* the batman interface mac address should never be purged */ | |
39901e71 | 228 | if (compare_eth(addr, soft_iface->dev_addr)) |
5fbc1598 | 229 | tt_local_entry->flags |= TT_CLIENT_NOPURGE; |
c6c8fea2 | 230 | |
ff66c975 AQ |
231 | tt_local_event(bat_priv, addr, tt_local_entry->flags); |
232 | ||
058d0e26 AQ |
233 | /* The local entry has to be marked as NEW to avoid to send it in |
234 | * a full table response going out before the next ttvn increment | |
235 | * (consistency check) */ | |
236 | tt_local_entry->flags |= TT_CLIENT_NEW; | |
237 | ||
2dafb49d AQ |
238 | hash_add(bat_priv->tt_local_hash, compare_ltt, choose_orig, |
239 | tt_local_entry, &tt_local_entry->hash_entry); | |
7683fdc1 | 240 | |
c6c8fea2 | 241 | /* remove address from global hash if present */ |
2dafb49d | 242 | tt_global_entry = tt_global_hash_find(bat_priv, addr); |
c6c8fea2 | 243 | |
cc47f66e AQ |
244 | /* Check whether it is a roaming! */ |
245 | if (tt_global_entry) { | |
cc47f66e AQ |
246 | /* This node is probably going to update its tt table */ |
247 | tt_global_entry->orig_node->tt_poss_change = true; | |
980d55b2 AQ |
248 | /* The global entry has to be marked as PENDING and has to be |
249 | * kept for consistency purpose */ | |
250 | tt_global_entry->flags |= TT_CLIENT_PENDING; | |
cc47f66e | 251 | send_roam_adv(bat_priv, tt_global_entry->addr, |
7683fdc1 AQ |
252 | tt_global_entry->orig_node); |
253 | } | |
254 | out: | |
255 | if (tt_local_entry) | |
256 | tt_local_entry_free_ref(tt_local_entry); | |
257 | if (tt_global_entry) | |
258 | tt_global_entry_free_ref(tt_global_entry); | |
c6c8fea2 SE |
259 | } |
260 | ||
a73105b8 AQ |
261 | int tt_changes_fill_buffer(struct bat_priv *bat_priv, |
262 | unsigned char *buff, int buff_len) | |
c6c8fea2 | 263 | { |
a73105b8 AQ |
264 | int count = 0, tot_changes = 0; |
265 | struct tt_change_node *entry, *safe; | |
c6c8fea2 | 266 | |
a73105b8 AQ |
267 | if (buff_len > 0) |
268 | tot_changes = buff_len / tt_len(1); | |
c6c8fea2 | 269 | |
a73105b8 AQ |
270 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
271 | atomic_set(&bat_priv->tt_local_changes, 0); | |
c6c8fea2 | 272 | |
a73105b8 AQ |
273 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
274 | list) { | |
275 | if (count < tot_changes) { | |
276 | memcpy(buff + tt_len(count), | |
277 | &entry->change, sizeof(struct tt_change)); | |
c6c8fea2 SE |
278 | count++; |
279 | } | |
a73105b8 AQ |
280 | list_del(&entry->list); |
281 | kfree(entry); | |
c6c8fea2 | 282 | } |
a73105b8 AQ |
283 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); |
284 | ||
285 | /* Keep the buffer for possible tt_request */ | |
286 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
287 | kfree(bat_priv->tt_buff); | |
288 | bat_priv->tt_buff_len = 0; | |
289 | bat_priv->tt_buff = NULL; | |
290 | /* We check whether this new OGM has no changes due to size | |
291 | * problems */ | |
292 | if (buff_len > 0) { | |
293 | /** | |
294 | * if kmalloc() fails we will reply with the full table | |
295 | * instead of providing the diff | |
296 | */ | |
297 | bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC); | |
298 | if (bat_priv->tt_buff) { | |
299 | memcpy(bat_priv->tt_buff, buff, buff_len); | |
300 | bat_priv->tt_buff_len = buff_len; | |
301 | } | |
302 | } | |
303 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
c6c8fea2 | 304 | |
a73105b8 | 305 | return tot_changes; |
c6c8fea2 SE |
306 | } |
307 | ||
2dafb49d | 308 | int tt_local_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
309 | { |
310 | struct net_device *net_dev = (struct net_device *)seq->private; | |
311 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
2dafb49d AQ |
312 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
313 | struct tt_local_entry *tt_local_entry; | |
32ae9b22 | 314 | struct hard_iface *primary_if; |
7aadf889 | 315 | struct hlist_node *node; |
c6c8fea2 | 316 | struct hlist_head *head; |
c90681b8 AQ |
317 | uint32_t i; |
318 | int ret = 0; | |
32ae9b22 ML |
319 | |
320 | primary_if = primary_if_get_selected(bat_priv); | |
321 | if (!primary_if) { | |
322 | ret = seq_printf(seq, "BATMAN mesh %s disabled - " | |
323 | "please specify interfaces to enable it\n", | |
324 | net_dev->name); | |
325 | goto out; | |
326 | } | |
c6c8fea2 | 327 | |
32ae9b22 ML |
328 | if (primary_if->if_status != IF_ACTIVE) { |
329 | ret = seq_printf(seq, "BATMAN mesh %s disabled - " | |
330 | "primary interface not active\n", | |
331 | net_dev->name); | |
332 | goto out; | |
c6c8fea2 SE |
333 | } |
334 | ||
335 | seq_printf(seq, "Locally retrieved addresses (from %s) " | |
a73105b8 AQ |
336 | "announced via TT (TTVN: %u):\n", |
337 | net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn)); | |
c6c8fea2 | 338 | |
c6c8fea2 SE |
339 | for (i = 0; i < hash->size; i++) { |
340 | head = &hash->table[i]; | |
341 | ||
7aadf889 | 342 | rcu_read_lock(); |
2dafb49d | 343 | hlist_for_each_entry_rcu(tt_local_entry, node, |
7aadf889 | 344 | head, hash_entry) { |
d099c2c5 | 345 | seq_printf(seq, " * %pM [%c%c%c%c%c]\n", |
df6edb9e AQ |
346 | tt_local_entry->addr, |
347 | (tt_local_entry->flags & | |
348 | TT_CLIENT_ROAM ? 'R' : '.'), | |
349 | (tt_local_entry->flags & | |
350 | TT_CLIENT_NOPURGE ? 'P' : '.'), | |
351 | (tt_local_entry->flags & | |
352 | TT_CLIENT_NEW ? 'N' : '.'), | |
353 | (tt_local_entry->flags & | |
354 | TT_CLIENT_PENDING ? 'X' : '.'), | |
355 | (tt_local_entry->flags & | |
356 | TT_CLIENT_WIFI ? 'W' : '.')); | |
c6c8fea2 | 357 | } |
7aadf889 | 358 | rcu_read_unlock(); |
c6c8fea2 | 359 | } |
32ae9b22 ML |
360 | out: |
361 | if (primary_if) | |
362 | hardif_free_ref(primary_if); | |
363 | return ret; | |
c6c8fea2 SE |
364 | } |
365 | ||
058d0e26 AQ |
366 | static void tt_local_set_pending(struct bat_priv *bat_priv, |
367 | struct tt_local_entry *tt_local_entry, | |
368 | uint16_t flags) | |
c6c8fea2 | 369 | { |
058d0e26 AQ |
370 | tt_local_event(bat_priv, tt_local_entry->addr, |
371 | tt_local_entry->flags | flags); | |
a73105b8 | 372 | |
015758d0 AQ |
373 | /* The local client has to be marked as "pending to be removed" but has |
374 | * to be kept in the table in order to send it in a full table | |
058d0e26 AQ |
375 | * response issued before the net ttvn increment (consistency check) */ |
376 | tt_local_entry->flags |= TT_CLIENT_PENDING; | |
c6c8fea2 SE |
377 | } |
378 | ||
a73105b8 | 379 | void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr, |
cc47f66e | 380 | const char *message, bool roaming) |
c6c8fea2 | 381 | { |
7683fdc1 | 382 | struct tt_local_entry *tt_local_entry = NULL; |
c6c8fea2 | 383 | |
2dafb49d | 384 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
385 | if (!tt_local_entry) |
386 | goto out; | |
387 | ||
058d0e26 AQ |
388 | tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL | |
389 | (roaming ? TT_CLIENT_ROAM : NO_FLAGS)); | |
390 | ||
391 | bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) pending to be removed: " | |
392 | "%s\n", tt_local_entry->addr, message); | |
7683fdc1 AQ |
393 | out: |
394 | if (tt_local_entry) | |
395 | tt_local_entry_free_ref(tt_local_entry); | |
c6c8fea2 SE |
396 | } |
397 | ||
a73105b8 | 398 | static void tt_local_purge(struct bat_priv *bat_priv) |
c6c8fea2 | 399 | { |
2dafb49d AQ |
400 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
401 | struct tt_local_entry *tt_local_entry; | |
7aadf889 | 402 | struct hlist_node *node, *node_tmp; |
c6c8fea2 | 403 | struct hlist_head *head; |
7683fdc1 | 404 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 405 | uint32_t i; |
c6c8fea2 | 406 | |
c6c8fea2 SE |
407 | for (i = 0; i < hash->size; i++) { |
408 | head = &hash->table[i]; | |
7683fdc1 | 409 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 410 | |
7683fdc1 | 411 | spin_lock_bh(list_lock); |
2dafb49d | 412 | hlist_for_each_entry_safe(tt_local_entry, node, node_tmp, |
7aadf889 | 413 | head, hash_entry) { |
5fbc1598 | 414 | if (tt_local_entry->flags & TT_CLIENT_NOPURGE) |
7aadf889 | 415 | continue; |
c6c8fea2 | 416 | |
058d0e26 AQ |
417 | /* entry already marked for deletion */ |
418 | if (tt_local_entry->flags & TT_CLIENT_PENDING) | |
419 | continue; | |
420 | ||
a73105b8 | 421 | if (!is_out_of_time(tt_local_entry->last_seen, |
7683fdc1 | 422 | TT_LOCAL_TIMEOUT * 1000)) |
7aadf889 ML |
423 | continue; |
424 | ||
058d0e26 AQ |
425 | tt_local_set_pending(bat_priv, tt_local_entry, |
426 | TT_CLIENT_DEL); | |
427 | bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) " | |
428 | "pending to be removed: timed out\n", | |
7683fdc1 | 429 | tt_local_entry->addr); |
c6c8fea2 | 430 | } |
7683fdc1 | 431 | spin_unlock_bh(list_lock); |
c6c8fea2 SE |
432 | } |
433 | ||
c6c8fea2 SE |
434 | } |
435 | ||
a73105b8 | 436 | static void tt_local_table_free(struct bat_priv *bat_priv) |
c6c8fea2 | 437 | { |
a73105b8 | 438 | struct hashtable_t *hash; |
a73105b8 | 439 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
a73105b8 | 440 | struct tt_local_entry *tt_local_entry; |
7683fdc1 AQ |
441 | struct hlist_node *node, *node_tmp; |
442 | struct hlist_head *head; | |
c90681b8 | 443 | uint32_t i; |
a73105b8 | 444 | |
2dafb49d | 445 | if (!bat_priv->tt_local_hash) |
c6c8fea2 SE |
446 | return; |
447 | ||
a73105b8 AQ |
448 | hash = bat_priv->tt_local_hash; |
449 | ||
450 | for (i = 0; i < hash->size; i++) { | |
451 | head = &hash->table[i]; | |
452 | list_lock = &hash->list_locks[i]; | |
453 | ||
454 | spin_lock_bh(list_lock); | |
455 | hlist_for_each_entry_safe(tt_local_entry, node, node_tmp, | |
456 | head, hash_entry) { | |
457 | hlist_del_rcu(node); | |
7683fdc1 | 458 | tt_local_entry_free_ref(tt_local_entry); |
a73105b8 AQ |
459 | } |
460 | spin_unlock_bh(list_lock); | |
461 | } | |
462 | ||
463 | hash_destroy(hash); | |
464 | ||
2dafb49d | 465 | bat_priv->tt_local_hash = NULL; |
c6c8fea2 SE |
466 | } |
467 | ||
a73105b8 | 468 | static int tt_global_init(struct bat_priv *bat_priv) |
c6c8fea2 | 469 | { |
2dafb49d | 470 | if (bat_priv->tt_global_hash) |
c6c8fea2 SE |
471 | return 1; |
472 | ||
2dafb49d | 473 | bat_priv->tt_global_hash = hash_new(1024); |
c6c8fea2 | 474 | |
2dafb49d | 475 | if (!bat_priv->tt_global_hash) |
c6c8fea2 SE |
476 | return 0; |
477 | ||
478 | return 1; | |
479 | } | |
480 | ||
a73105b8 | 481 | static void tt_changes_list_free(struct bat_priv *bat_priv) |
c6c8fea2 | 482 | { |
a73105b8 | 483 | struct tt_change_node *entry, *safe; |
c6c8fea2 | 484 | |
a73105b8 | 485 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
c6c8fea2 | 486 | |
a73105b8 AQ |
487 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
488 | list) { | |
489 | list_del(&entry->list); | |
490 | kfree(entry); | |
491 | } | |
c6c8fea2 | 492 | |
a73105b8 AQ |
493 | atomic_set(&bat_priv->tt_local_changes, 0); |
494 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); | |
495 | } | |
c6c8fea2 | 496 | |
a73105b8 AQ |
497 | /* caller must hold orig_node refcount */ |
498 | int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
bc279080 AQ |
499 | const unsigned char *tt_addr, uint8_t ttvn, bool roaming, |
500 | bool wifi) | |
a73105b8 AQ |
501 | { |
502 | struct tt_global_entry *tt_global_entry; | |
a73105b8 | 503 | struct orig_node *orig_node_tmp; |
7683fdc1 | 504 | int ret = 0; |
c6c8fea2 | 505 | |
a73105b8 AQ |
506 | tt_global_entry = tt_global_hash_find(bat_priv, tt_addr); |
507 | ||
508 | if (!tt_global_entry) { | |
509 | tt_global_entry = | |
510 | kmalloc(sizeof(*tt_global_entry), | |
511 | GFP_ATOMIC); | |
512 | if (!tt_global_entry) | |
7683fdc1 AQ |
513 | goto out; |
514 | ||
a73105b8 AQ |
515 | memcpy(tt_global_entry->addr, tt_addr, ETH_ALEN); |
516 | /* Assign the new orig_node */ | |
517 | atomic_inc(&orig_node->refcount); | |
2dafb49d | 518 | tt_global_entry->orig_node = orig_node; |
a73105b8 | 519 | tt_global_entry->ttvn = ttvn; |
cc47f66e AQ |
520 | tt_global_entry->flags = NO_FLAGS; |
521 | tt_global_entry->roam_at = 0; | |
7683fdc1 AQ |
522 | atomic_set(&tt_global_entry->refcount, 2); |
523 | ||
a73105b8 AQ |
524 | hash_add(bat_priv->tt_global_hash, compare_gtt, |
525 | choose_orig, tt_global_entry, | |
526 | &tt_global_entry->hash_entry); | |
7683fdc1 | 527 | atomic_inc(&orig_node->tt_size); |
a73105b8 AQ |
528 | } else { |
529 | if (tt_global_entry->orig_node != orig_node) { | |
530 | atomic_dec(&tt_global_entry->orig_node->tt_size); | |
531 | orig_node_tmp = tt_global_entry->orig_node; | |
532 | atomic_inc(&orig_node->refcount); | |
533 | tt_global_entry->orig_node = orig_node; | |
a73105b8 AQ |
534 | orig_node_free_ref(orig_node_tmp); |
535 | atomic_inc(&orig_node->tt_size); | |
536 | } | |
cc47f66e AQ |
537 | tt_global_entry->ttvn = ttvn; |
538 | tt_global_entry->flags = NO_FLAGS; | |
539 | tt_global_entry->roam_at = 0; | |
a73105b8 | 540 | } |
c6c8fea2 | 541 | |
bc279080 AQ |
542 | if (wifi) |
543 | tt_global_entry->flags |= TT_CLIENT_WIFI; | |
544 | ||
a73105b8 AQ |
545 | bat_dbg(DBG_TT, bat_priv, |
546 | "Creating new global tt entry: %pM (via %pM)\n", | |
547 | tt_global_entry->addr, orig_node->orig); | |
c6c8fea2 | 548 | |
a73105b8 | 549 | /* remove address from local hash if present */ |
7683fdc1 AQ |
550 | tt_local_remove(bat_priv, tt_global_entry->addr, |
551 | "global tt received", roaming); | |
552 | ret = 1; | |
553 | out: | |
554 | if (tt_global_entry) | |
555 | tt_global_entry_free_ref(tt_global_entry); | |
556 | return ret; | |
c6c8fea2 SE |
557 | } |
558 | ||
2dafb49d | 559 | int tt_global_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
560 | { |
561 | struct net_device *net_dev = (struct net_device *)seq->private; | |
562 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
2dafb49d AQ |
563 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
564 | struct tt_global_entry *tt_global_entry; | |
32ae9b22 | 565 | struct hard_iface *primary_if; |
7aadf889 | 566 | struct hlist_node *node; |
c6c8fea2 | 567 | struct hlist_head *head; |
c90681b8 AQ |
568 | uint32_t i; |
569 | int ret = 0; | |
32ae9b22 ML |
570 | |
571 | primary_if = primary_if_get_selected(bat_priv); | |
572 | if (!primary_if) { | |
573 | ret = seq_printf(seq, "BATMAN mesh %s disabled - please " | |
574 | "specify interfaces to enable it\n", | |
575 | net_dev->name); | |
576 | goto out; | |
577 | } | |
c6c8fea2 | 578 | |
32ae9b22 ML |
579 | if (primary_if->if_status != IF_ACTIVE) { |
580 | ret = seq_printf(seq, "BATMAN mesh %s disabled - " | |
581 | "primary interface not active\n", | |
582 | net_dev->name); | |
583 | goto out; | |
c6c8fea2 SE |
584 | } |
585 | ||
2dafb49d AQ |
586 | seq_printf(seq, |
587 | "Globally announced TT entries received via the mesh %s\n", | |
c6c8fea2 | 588 | net_dev->name); |
df6edb9e AQ |
589 | seq_printf(seq, " %-13s %s %-15s %s %s\n", |
590 | "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags"); | |
c6c8fea2 | 591 | |
c6c8fea2 SE |
592 | for (i = 0; i < hash->size; i++) { |
593 | head = &hash->table[i]; | |
594 | ||
7aadf889 | 595 | rcu_read_lock(); |
2dafb49d | 596 | hlist_for_each_entry_rcu(tt_global_entry, node, |
7aadf889 | 597 | head, hash_entry) { |
d099c2c5 | 598 | seq_printf(seq, " * %pM (%3u) via %pM (%3u) " |
df6edb9e | 599 | "[%c%c%c]\n", tt_global_entry->addr, |
a73105b8 AQ |
600 | tt_global_entry->ttvn, |
601 | tt_global_entry->orig_node->orig, | |
602 | (uint8_t) atomic_read( | |
603 | &tt_global_entry->orig_node-> | |
df6edb9e AQ |
604 | last_ttvn), |
605 | (tt_global_entry->flags & | |
606 | TT_CLIENT_ROAM ? 'R' : '.'), | |
607 | (tt_global_entry->flags & | |
608 | TT_CLIENT_PENDING ? 'X' : '.'), | |
609 | (tt_global_entry->flags & | |
610 | TT_CLIENT_WIFI ? 'W' : '.')); | |
c6c8fea2 | 611 | } |
7aadf889 | 612 | rcu_read_unlock(); |
c6c8fea2 | 613 | } |
32ae9b22 ML |
614 | out: |
615 | if (primary_if) | |
616 | hardif_free_ref(primary_if); | |
617 | return ret; | |
c6c8fea2 SE |
618 | } |
619 | ||
a73105b8 AQ |
620 | static void _tt_global_del(struct bat_priv *bat_priv, |
621 | struct tt_global_entry *tt_global_entry, | |
622 | const char *message) | |
c6c8fea2 | 623 | { |
a73105b8 | 624 | if (!tt_global_entry) |
7683fdc1 | 625 | goto out; |
a73105b8 AQ |
626 | |
627 | bat_dbg(DBG_TT, bat_priv, | |
2dafb49d AQ |
628 | "Deleting global tt entry %pM (via %pM): %s\n", |
629 | tt_global_entry->addr, tt_global_entry->orig_node->orig, | |
c6c8fea2 SE |
630 | message); |
631 | ||
a73105b8 | 632 | atomic_dec(&tt_global_entry->orig_node->tt_size); |
7683fdc1 | 633 | |
2dafb49d AQ |
634 | hash_remove(bat_priv->tt_global_hash, compare_gtt, choose_orig, |
635 | tt_global_entry->addr); | |
7683fdc1 AQ |
636 | out: |
637 | if (tt_global_entry) | |
638 | tt_global_entry_free_ref(tt_global_entry); | |
c6c8fea2 SE |
639 | } |
640 | ||
a73105b8 AQ |
641 | void tt_global_del(struct bat_priv *bat_priv, |
642 | struct orig_node *orig_node, const unsigned char *addr, | |
cc47f66e | 643 | const char *message, bool roaming) |
a73105b8 | 644 | { |
7683fdc1 | 645 | struct tt_global_entry *tt_global_entry = NULL; |
a73105b8 | 646 | |
a73105b8 | 647 | tt_global_entry = tt_global_hash_find(bat_priv, addr); |
7683fdc1 AQ |
648 | if (!tt_global_entry) |
649 | goto out; | |
a73105b8 | 650 | |
7683fdc1 | 651 | if (tt_global_entry->orig_node == orig_node) { |
cc47f66e AQ |
652 | if (roaming) { |
653 | tt_global_entry->flags |= TT_CLIENT_ROAM; | |
654 | tt_global_entry->roam_at = jiffies; | |
655 | goto out; | |
656 | } | |
a73105b8 AQ |
657 | _tt_global_del(bat_priv, tt_global_entry, message); |
658 | } | |
cc47f66e | 659 | out: |
7683fdc1 AQ |
660 | if (tt_global_entry) |
661 | tt_global_entry_free_ref(tt_global_entry); | |
a73105b8 AQ |
662 | } |
663 | ||
2dafb49d | 664 | void tt_global_del_orig(struct bat_priv *bat_priv, |
a73105b8 | 665 | struct orig_node *orig_node, const char *message) |
c6c8fea2 | 666 | { |
2dafb49d | 667 | struct tt_global_entry *tt_global_entry; |
c90681b8 | 668 | uint32_t i; |
a73105b8 AQ |
669 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
670 | struct hlist_node *node, *safe; | |
671 | struct hlist_head *head; | |
7683fdc1 | 672 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c6c8fea2 | 673 | |
6e801494 SW |
674 | if (!hash) |
675 | return; | |
676 | ||
a73105b8 AQ |
677 | for (i = 0; i < hash->size; i++) { |
678 | head = &hash->table[i]; | |
7683fdc1 | 679 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 680 | |
7683fdc1 | 681 | spin_lock_bh(list_lock); |
a73105b8 AQ |
682 | hlist_for_each_entry_safe(tt_global_entry, node, safe, |
683 | head, hash_entry) { | |
7683fdc1 AQ |
684 | if (tt_global_entry->orig_node == orig_node) { |
685 | bat_dbg(DBG_TT, bat_priv, | |
686 | "Deleting global tt entry %pM " | |
87944973 | 687 | "(via %pM): %s\n", |
7683fdc1 | 688 | tt_global_entry->addr, |
87944973 AQ |
689 | tt_global_entry->orig_node->orig, |
690 | message); | |
7683fdc1 AQ |
691 | hlist_del_rcu(node); |
692 | tt_global_entry_free_ref(tt_global_entry); | |
693 | } | |
a73105b8 | 694 | } |
7683fdc1 | 695 | spin_unlock_bh(list_lock); |
c6c8fea2 | 696 | } |
a73105b8 | 697 | atomic_set(&orig_node->tt_size, 0); |
c6c8fea2 SE |
698 | } |
699 | ||
cc47f66e AQ |
700 | static void tt_global_roam_purge(struct bat_priv *bat_priv) |
701 | { | |
702 | struct hashtable_t *hash = bat_priv->tt_global_hash; | |
703 | struct tt_global_entry *tt_global_entry; | |
704 | struct hlist_node *node, *node_tmp; | |
705 | struct hlist_head *head; | |
7683fdc1 | 706 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 707 | uint32_t i; |
cc47f66e | 708 | |
cc47f66e AQ |
709 | for (i = 0; i < hash->size; i++) { |
710 | head = &hash->table[i]; | |
7683fdc1 | 711 | list_lock = &hash->list_locks[i]; |
cc47f66e | 712 | |
7683fdc1 | 713 | spin_lock_bh(list_lock); |
cc47f66e AQ |
714 | hlist_for_each_entry_safe(tt_global_entry, node, node_tmp, |
715 | head, hash_entry) { | |
716 | if (!(tt_global_entry->flags & TT_CLIENT_ROAM)) | |
717 | continue; | |
718 | if (!is_out_of_time(tt_global_entry->roam_at, | |
719 | TT_CLIENT_ROAM_TIMEOUT * 1000)) | |
720 | continue; | |
721 | ||
7683fdc1 AQ |
722 | bat_dbg(DBG_TT, bat_priv, "Deleting global " |
723 | "tt entry (%pM): Roaming timeout\n", | |
724 | tt_global_entry->addr); | |
725 | atomic_dec(&tt_global_entry->orig_node->tt_size); | |
726 | hlist_del_rcu(node); | |
727 | tt_global_entry_free_ref(tt_global_entry); | |
cc47f66e | 728 | } |
7683fdc1 | 729 | spin_unlock_bh(list_lock); |
cc47f66e AQ |
730 | } |
731 | ||
cc47f66e AQ |
732 | } |
733 | ||
a73105b8 | 734 | static void tt_global_table_free(struct bat_priv *bat_priv) |
c6c8fea2 | 735 | { |
7683fdc1 AQ |
736 | struct hashtable_t *hash; |
737 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
738 | struct tt_global_entry *tt_global_entry; | |
739 | struct hlist_node *node, *node_tmp; | |
740 | struct hlist_head *head; | |
c90681b8 | 741 | uint32_t i; |
7683fdc1 | 742 | |
2dafb49d | 743 | if (!bat_priv->tt_global_hash) |
c6c8fea2 SE |
744 | return; |
745 | ||
7683fdc1 AQ |
746 | hash = bat_priv->tt_global_hash; |
747 | ||
748 | for (i = 0; i < hash->size; i++) { | |
749 | head = &hash->table[i]; | |
750 | list_lock = &hash->list_locks[i]; | |
751 | ||
752 | spin_lock_bh(list_lock); | |
753 | hlist_for_each_entry_safe(tt_global_entry, node, node_tmp, | |
754 | head, hash_entry) { | |
755 | hlist_del_rcu(node); | |
756 | tt_global_entry_free_ref(tt_global_entry); | |
757 | } | |
758 | spin_unlock_bh(list_lock); | |
759 | } | |
760 | ||
761 | hash_destroy(hash); | |
762 | ||
2dafb49d | 763 | bat_priv->tt_global_hash = NULL; |
c6c8fea2 SE |
764 | } |
765 | ||
59b699cd AQ |
766 | static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry, |
767 | struct tt_global_entry *tt_global_entry) | |
768 | { | |
769 | bool ret = false; | |
770 | ||
771 | if (tt_local_entry->flags & TT_CLIENT_WIFI && | |
772 | tt_global_entry->flags & TT_CLIENT_WIFI) | |
773 | ret = true; | |
774 | ||
775 | return ret; | |
776 | } | |
777 | ||
747e4221 | 778 | struct orig_node *transtable_search(struct bat_priv *bat_priv, |
3d393e47 | 779 | const uint8_t *src, const uint8_t *addr) |
c6c8fea2 | 780 | { |
3d393e47 AQ |
781 | struct tt_local_entry *tt_local_entry = NULL; |
782 | struct tt_global_entry *tt_global_entry = NULL; | |
7b36e8ee | 783 | struct orig_node *orig_node = NULL; |
c6c8fea2 | 784 | |
3d393e47 AQ |
785 | if (src && atomic_read(&bat_priv->ap_isolation)) { |
786 | tt_local_entry = tt_local_hash_find(bat_priv, src); | |
787 | if (!tt_local_entry) | |
788 | goto out; | |
789 | } | |
7aadf889 | 790 | |
3d393e47 | 791 | tt_global_entry = tt_global_hash_find(bat_priv, addr); |
2dafb49d | 792 | if (!tt_global_entry) |
7b36e8ee | 793 | goto out; |
7aadf889 | 794 | |
3d393e47 AQ |
795 | /* check whether the clients should not communicate due to AP |
796 | * isolation */ | |
797 | if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry)) | |
798 | goto out; | |
799 | ||
2dafb49d | 800 | if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount)) |
3d393e47 | 801 | goto out; |
c6c8fea2 | 802 | |
980d55b2 AQ |
803 | /* A global client marked as PENDING has already moved from that |
804 | * originator */ | |
805 | if (tt_global_entry->flags & TT_CLIENT_PENDING) | |
3d393e47 | 806 | goto out; |
980d55b2 | 807 | |
2dafb49d | 808 | orig_node = tt_global_entry->orig_node; |
c6c8fea2 | 809 | |
7b36e8ee | 810 | out: |
3d393e47 AQ |
811 | if (tt_global_entry) |
812 | tt_global_entry_free_ref(tt_global_entry); | |
813 | if (tt_local_entry) | |
814 | tt_local_entry_free_ref(tt_local_entry); | |
815 | ||
7b36e8ee | 816 | return orig_node; |
c6c8fea2 | 817 | } |
a73105b8 AQ |
818 | |
819 | /* Calculates the checksum of the local table of a given orig_node */ | |
820 | uint16_t tt_global_crc(struct bat_priv *bat_priv, struct orig_node *orig_node) | |
821 | { | |
822 | uint16_t total = 0, total_one; | |
823 | struct hashtable_t *hash = bat_priv->tt_global_hash; | |
824 | struct tt_global_entry *tt_global_entry; | |
825 | struct hlist_node *node; | |
826 | struct hlist_head *head; | |
c90681b8 AQ |
827 | uint32_t i; |
828 | int j; | |
a73105b8 AQ |
829 | |
830 | for (i = 0; i < hash->size; i++) { | |
831 | head = &hash->table[i]; | |
832 | ||
833 | rcu_read_lock(); | |
834 | hlist_for_each_entry_rcu(tt_global_entry, node, | |
835 | head, hash_entry) { | |
836 | if (compare_eth(tt_global_entry->orig_node, | |
837 | orig_node)) { | |
cc47f66e AQ |
838 | /* Roaming clients are in the global table for |
839 | * consistency only. They don't have to be | |
840 | * taken into account while computing the | |
841 | * global crc */ | |
842 | if (tt_global_entry->flags & TT_CLIENT_ROAM) | |
843 | continue; | |
a73105b8 AQ |
844 | total_one = 0; |
845 | for (j = 0; j < ETH_ALEN; j++) | |
846 | total_one = crc16_byte(total_one, | |
847 | tt_global_entry->addr[j]); | |
848 | total ^= total_one; | |
849 | } | |
850 | } | |
851 | rcu_read_unlock(); | |
852 | } | |
853 | ||
854 | return total; | |
855 | } | |
856 | ||
857 | /* Calculates the checksum of the local table */ | |
858 | uint16_t tt_local_crc(struct bat_priv *bat_priv) | |
859 | { | |
860 | uint16_t total = 0, total_one; | |
861 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
862 | struct tt_local_entry *tt_local_entry; | |
863 | struct hlist_node *node; | |
864 | struct hlist_head *head; | |
c90681b8 AQ |
865 | uint32_t i; |
866 | int j; | |
a73105b8 AQ |
867 | |
868 | for (i = 0; i < hash->size; i++) { | |
869 | head = &hash->table[i]; | |
870 | ||
871 | rcu_read_lock(); | |
872 | hlist_for_each_entry_rcu(tt_local_entry, node, | |
873 | head, hash_entry) { | |
058d0e26 AQ |
874 | /* not yet committed clients have not to be taken into |
875 | * account while computing the CRC */ | |
876 | if (tt_local_entry->flags & TT_CLIENT_NEW) | |
877 | continue; | |
a73105b8 AQ |
878 | total_one = 0; |
879 | for (j = 0; j < ETH_ALEN; j++) | |
880 | total_one = crc16_byte(total_one, | |
881 | tt_local_entry->addr[j]); | |
882 | total ^= total_one; | |
883 | } | |
a73105b8 AQ |
884 | rcu_read_unlock(); |
885 | } | |
886 | ||
887 | return total; | |
888 | } | |
889 | ||
890 | static void tt_req_list_free(struct bat_priv *bat_priv) | |
891 | { | |
892 | struct tt_req_node *node, *safe; | |
893 | ||
894 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
895 | ||
896 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
897 | list_del(&node->list); | |
898 | kfree(node); | |
899 | } | |
900 | ||
901 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
902 | } | |
903 | ||
904 | void tt_save_orig_buffer(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
905 | const unsigned char *tt_buff, uint8_t tt_num_changes) | |
906 | { | |
907 | uint16_t tt_buff_len = tt_len(tt_num_changes); | |
908 | ||
909 | /* Replace the old buffer only if I received something in the | |
910 | * last OGM (the OGM could carry no changes) */ | |
911 | spin_lock_bh(&orig_node->tt_buff_lock); | |
912 | if (tt_buff_len > 0) { | |
913 | kfree(orig_node->tt_buff); | |
914 | orig_node->tt_buff_len = 0; | |
915 | orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); | |
916 | if (orig_node->tt_buff) { | |
917 | memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); | |
918 | orig_node->tt_buff_len = tt_buff_len; | |
919 | } | |
920 | } | |
921 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
922 | } | |
923 | ||
924 | static void tt_req_purge(struct bat_priv *bat_priv) | |
925 | { | |
926 | struct tt_req_node *node, *safe; | |
927 | ||
928 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
929 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
930 | if (is_out_of_time(node->issued_at, | |
931 | TT_REQUEST_TIMEOUT * 1000)) { | |
932 | list_del(&node->list); | |
933 | kfree(node); | |
934 | } | |
935 | } | |
936 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
937 | } | |
938 | ||
939 | /* returns the pointer to the new tt_req_node struct if no request | |
940 | * has already been issued for this orig_node, NULL otherwise */ | |
941 | static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv, | |
942 | struct orig_node *orig_node) | |
943 | { | |
944 | struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; | |
945 | ||
946 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
947 | list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) { | |
948 | if (compare_eth(tt_req_node_tmp, orig_node) && | |
949 | !is_out_of_time(tt_req_node_tmp->issued_at, | |
950 | TT_REQUEST_TIMEOUT * 1000)) | |
951 | goto unlock; | |
952 | } | |
953 | ||
954 | tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); | |
955 | if (!tt_req_node) | |
956 | goto unlock; | |
957 | ||
958 | memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); | |
959 | tt_req_node->issued_at = jiffies; | |
960 | ||
961 | list_add(&tt_req_node->list, &bat_priv->tt_req_list); | |
962 | unlock: | |
963 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
964 | return tt_req_node; | |
965 | } | |
966 | ||
058d0e26 AQ |
967 | /* data_ptr is useless here, but has to be kept to respect the prototype */ |
968 | static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr) | |
969 | { | |
970 | const struct tt_local_entry *tt_local_entry = entry_ptr; | |
971 | ||
972 | if (tt_local_entry->flags & TT_CLIENT_NEW) | |
973 | return 0; | |
974 | return 1; | |
975 | } | |
976 | ||
a73105b8 AQ |
977 | static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr) |
978 | { | |
979 | const struct tt_global_entry *tt_global_entry = entry_ptr; | |
980 | const struct orig_node *orig_node = data_ptr; | |
981 | ||
cc47f66e AQ |
982 | if (tt_global_entry->flags & TT_CLIENT_ROAM) |
983 | return 0; | |
984 | ||
a73105b8 AQ |
985 | return (tt_global_entry->orig_node == orig_node); |
986 | } | |
987 | ||
988 | static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, | |
989 | struct hashtable_t *hash, | |
990 | struct hard_iface *primary_if, | |
991 | int (*valid_cb)(const void *, | |
992 | const void *), | |
993 | void *cb_data) | |
994 | { | |
995 | struct tt_local_entry *tt_local_entry; | |
996 | struct tt_query_packet *tt_response; | |
997 | struct tt_change *tt_change; | |
998 | struct hlist_node *node; | |
999 | struct hlist_head *head; | |
1000 | struct sk_buff *skb = NULL; | |
1001 | uint16_t tt_tot, tt_count; | |
1002 | ssize_t tt_query_size = sizeof(struct tt_query_packet); | |
c90681b8 | 1003 | uint32_t i; |
a73105b8 AQ |
1004 | |
1005 | if (tt_query_size + tt_len > primary_if->soft_iface->mtu) { | |
1006 | tt_len = primary_if->soft_iface->mtu - tt_query_size; | |
1007 | tt_len -= tt_len % sizeof(struct tt_change); | |
1008 | } | |
1009 | tt_tot = tt_len / sizeof(struct tt_change); | |
1010 | ||
1011 | skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN); | |
1012 | if (!skb) | |
1013 | goto out; | |
1014 | ||
1015 | skb_reserve(skb, ETH_HLEN); | |
1016 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1017 | tt_query_size + tt_len); | |
1018 | tt_response->ttvn = ttvn; | |
a73105b8 AQ |
1019 | |
1020 | tt_change = (struct tt_change *)(skb->data + tt_query_size); | |
1021 | tt_count = 0; | |
1022 | ||
1023 | rcu_read_lock(); | |
1024 | for (i = 0; i < hash->size; i++) { | |
1025 | head = &hash->table[i]; | |
1026 | ||
1027 | hlist_for_each_entry_rcu(tt_local_entry, node, | |
1028 | head, hash_entry) { | |
1029 | if (tt_count == tt_tot) | |
1030 | break; | |
1031 | ||
1032 | if ((valid_cb) && (!valid_cb(tt_local_entry, cb_data))) | |
1033 | continue; | |
1034 | ||
1035 | memcpy(tt_change->addr, tt_local_entry->addr, ETH_ALEN); | |
1036 | tt_change->flags = NO_FLAGS; | |
1037 | ||
1038 | tt_count++; | |
1039 | tt_change++; | |
1040 | } | |
1041 | } | |
1042 | rcu_read_unlock(); | |
1043 | ||
9d852393 AQ |
1044 | /* store in the message the number of entries we have successfully |
1045 | * copied */ | |
1046 | tt_response->tt_data = htons(tt_count); | |
1047 | ||
a73105b8 AQ |
1048 | out: |
1049 | return skb; | |
1050 | } | |
1051 | ||
a943cac1 ML |
1052 | static int send_tt_request(struct bat_priv *bat_priv, |
1053 | struct orig_node *dst_orig_node, | |
1054 | uint8_t ttvn, uint16_t tt_crc, bool full_table) | |
a73105b8 AQ |
1055 | { |
1056 | struct sk_buff *skb = NULL; | |
1057 | struct tt_query_packet *tt_request; | |
1058 | struct neigh_node *neigh_node = NULL; | |
1059 | struct hard_iface *primary_if; | |
1060 | struct tt_req_node *tt_req_node = NULL; | |
1061 | int ret = 1; | |
1062 | ||
1063 | primary_if = primary_if_get_selected(bat_priv); | |
1064 | if (!primary_if) | |
1065 | goto out; | |
1066 | ||
1067 | /* The new tt_req will be issued only if I'm not waiting for a | |
1068 | * reply from the same orig_node yet */ | |
1069 | tt_req_node = new_tt_req_node(bat_priv, dst_orig_node); | |
1070 | if (!tt_req_node) | |
1071 | goto out; | |
1072 | ||
1073 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN); | |
1074 | if (!skb) | |
1075 | goto out; | |
1076 | ||
1077 | skb_reserve(skb, ETH_HLEN); | |
1078 | ||
1079 | tt_request = (struct tt_query_packet *)skb_put(skb, | |
1080 | sizeof(struct tt_query_packet)); | |
1081 | ||
1082 | tt_request->packet_type = BAT_TT_QUERY; | |
1083 | tt_request->version = COMPAT_VERSION; | |
1084 | memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN); | |
1085 | memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN); | |
1086 | tt_request->ttl = TTL; | |
1087 | tt_request->ttvn = ttvn; | |
1088 | tt_request->tt_data = tt_crc; | |
1089 | tt_request->flags = TT_REQUEST; | |
1090 | ||
1091 | if (full_table) | |
1092 | tt_request->flags |= TT_FULL_TABLE; | |
1093 | ||
1094 | neigh_node = orig_node_get_router(dst_orig_node); | |
1095 | if (!neigh_node) | |
1096 | goto out; | |
1097 | ||
1098 | bat_dbg(DBG_TT, bat_priv, "Sending TT_REQUEST to %pM via %pM " | |
1099 | "[%c]\n", dst_orig_node->orig, neigh_node->addr, | |
1100 | (full_table ? 'F' : '.')); | |
1101 | ||
1102 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1103 | ret = 0; | |
1104 | ||
1105 | out: | |
1106 | if (neigh_node) | |
1107 | neigh_node_free_ref(neigh_node); | |
1108 | if (primary_if) | |
1109 | hardif_free_ref(primary_if); | |
1110 | if (ret) | |
1111 | kfree_skb(skb); | |
1112 | if (ret && tt_req_node) { | |
1113 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1114 | list_del(&tt_req_node->list); | |
1115 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1116 | kfree(tt_req_node); | |
1117 | } | |
1118 | return ret; | |
1119 | } | |
1120 | ||
1121 | static bool send_other_tt_response(struct bat_priv *bat_priv, | |
1122 | struct tt_query_packet *tt_request) | |
1123 | { | |
1124 | struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL; | |
1125 | struct neigh_node *neigh_node = NULL; | |
1126 | struct hard_iface *primary_if = NULL; | |
1127 | uint8_t orig_ttvn, req_ttvn, ttvn; | |
1128 | int ret = false; | |
1129 | unsigned char *tt_buff; | |
1130 | bool full_table; | |
1131 | uint16_t tt_len, tt_tot; | |
1132 | struct sk_buff *skb = NULL; | |
1133 | struct tt_query_packet *tt_response; | |
1134 | ||
1135 | bat_dbg(DBG_TT, bat_priv, | |
1136 | "Received TT_REQUEST from %pM for " | |
1137 | "ttvn: %u (%pM) [%c]\n", tt_request->src, | |
1138 | tt_request->ttvn, tt_request->dst, | |
1139 | (tt_request->flags & TT_FULL_TABLE ? 'F' : '.')); | |
1140 | ||
1141 | /* Let's get the orig node of the REAL destination */ | |
eb7e2a1e | 1142 | req_dst_orig_node = orig_hash_find(bat_priv, tt_request->dst); |
a73105b8 AQ |
1143 | if (!req_dst_orig_node) |
1144 | goto out; | |
1145 | ||
eb7e2a1e | 1146 | res_dst_orig_node = orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1147 | if (!res_dst_orig_node) |
1148 | goto out; | |
1149 | ||
1150 | neigh_node = orig_node_get_router(res_dst_orig_node); | |
1151 | if (!neigh_node) | |
1152 | goto out; | |
1153 | ||
1154 | primary_if = primary_if_get_selected(bat_priv); | |
1155 | if (!primary_if) | |
1156 | goto out; | |
1157 | ||
1158 | orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1159 | req_ttvn = tt_request->ttvn; | |
1160 | ||
015758d0 | 1161 | /* I don't have the requested data */ |
a73105b8 AQ |
1162 | if (orig_ttvn != req_ttvn || |
1163 | tt_request->tt_data != req_dst_orig_node->tt_crc) | |
1164 | goto out; | |
1165 | ||
015758d0 | 1166 | /* If the full table has been explicitly requested */ |
a73105b8 AQ |
1167 | if (tt_request->flags & TT_FULL_TABLE || |
1168 | !req_dst_orig_node->tt_buff) | |
1169 | full_table = true; | |
1170 | else | |
1171 | full_table = false; | |
1172 | ||
1173 | /* In this version, fragmentation is not implemented, then | |
1174 | * I'll send only one packet with as much TT entries as I can */ | |
1175 | if (!full_table) { | |
1176 | spin_lock_bh(&req_dst_orig_node->tt_buff_lock); | |
1177 | tt_len = req_dst_orig_node->tt_buff_len; | |
1178 | tt_tot = tt_len / sizeof(struct tt_change); | |
1179 | ||
1180 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + | |
1181 | tt_len + ETH_HLEN); | |
1182 | if (!skb) | |
1183 | goto unlock; | |
1184 | ||
1185 | skb_reserve(skb, ETH_HLEN); | |
1186 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1187 | sizeof(struct tt_query_packet) + tt_len); | |
1188 | tt_response->ttvn = req_ttvn; | |
1189 | tt_response->tt_data = htons(tt_tot); | |
1190 | ||
1191 | tt_buff = skb->data + sizeof(struct tt_query_packet); | |
1192 | /* Copy the last orig_node's OGM buffer */ | |
1193 | memcpy(tt_buff, req_dst_orig_node->tt_buff, | |
1194 | req_dst_orig_node->tt_buff_len); | |
1195 | ||
1196 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1197 | } else { | |
1198 | tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) * | |
1199 | sizeof(struct tt_change); | |
1200 | ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1201 | ||
1202 | skb = tt_response_fill_table(tt_len, ttvn, | |
1203 | bat_priv->tt_global_hash, | |
1204 | primary_if, tt_global_valid_entry, | |
1205 | req_dst_orig_node); | |
1206 | if (!skb) | |
1207 | goto out; | |
1208 | ||
1209 | tt_response = (struct tt_query_packet *)skb->data; | |
1210 | } | |
1211 | ||
1212 | tt_response->packet_type = BAT_TT_QUERY; | |
1213 | tt_response->version = COMPAT_VERSION; | |
1214 | tt_response->ttl = TTL; | |
1215 | memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN); | |
1216 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
1217 | tt_response->flags = TT_RESPONSE; | |
1218 | ||
1219 | if (full_table) | |
1220 | tt_response->flags |= TT_FULL_TABLE; | |
1221 | ||
1222 | bat_dbg(DBG_TT, bat_priv, | |
1223 | "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n", | |
1224 | res_dst_orig_node->orig, neigh_node->addr, | |
1225 | req_dst_orig_node->orig, req_ttvn); | |
1226 | ||
1227 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1228 | ret = true; | |
1229 | goto out; | |
1230 | ||
1231 | unlock: | |
1232 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1233 | ||
1234 | out: | |
1235 | if (res_dst_orig_node) | |
1236 | orig_node_free_ref(res_dst_orig_node); | |
1237 | if (req_dst_orig_node) | |
1238 | orig_node_free_ref(req_dst_orig_node); | |
1239 | if (neigh_node) | |
1240 | neigh_node_free_ref(neigh_node); | |
1241 | if (primary_if) | |
1242 | hardif_free_ref(primary_if); | |
1243 | if (!ret) | |
1244 | kfree_skb(skb); | |
1245 | return ret; | |
1246 | ||
1247 | } | |
1248 | static bool send_my_tt_response(struct bat_priv *bat_priv, | |
1249 | struct tt_query_packet *tt_request) | |
1250 | { | |
1251 | struct orig_node *orig_node = NULL; | |
1252 | struct neigh_node *neigh_node = NULL; | |
1253 | struct hard_iface *primary_if = NULL; | |
1254 | uint8_t my_ttvn, req_ttvn, ttvn; | |
1255 | int ret = false; | |
1256 | unsigned char *tt_buff; | |
1257 | bool full_table; | |
1258 | uint16_t tt_len, tt_tot; | |
1259 | struct sk_buff *skb = NULL; | |
1260 | struct tt_query_packet *tt_response; | |
1261 | ||
1262 | bat_dbg(DBG_TT, bat_priv, | |
1263 | "Received TT_REQUEST from %pM for " | |
1264 | "ttvn: %u (me) [%c]\n", tt_request->src, | |
1265 | tt_request->ttvn, | |
1266 | (tt_request->flags & TT_FULL_TABLE ? 'F' : '.')); | |
1267 | ||
1268 | ||
1269 | my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1270 | req_ttvn = tt_request->ttvn; | |
1271 | ||
eb7e2a1e | 1272 | orig_node = orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1273 | if (!orig_node) |
1274 | goto out; | |
1275 | ||
1276 | neigh_node = orig_node_get_router(orig_node); | |
1277 | if (!neigh_node) | |
1278 | goto out; | |
1279 | ||
1280 | primary_if = primary_if_get_selected(bat_priv); | |
1281 | if (!primary_if) | |
1282 | goto out; | |
1283 | ||
1284 | /* If the full table has been explicitly requested or the gap | |
1285 | * is too big send the whole local translation table */ | |
1286 | if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn || | |
1287 | !bat_priv->tt_buff) | |
1288 | full_table = true; | |
1289 | else | |
1290 | full_table = false; | |
1291 | ||
1292 | /* In this version, fragmentation is not implemented, then | |
1293 | * I'll send only one packet with as much TT entries as I can */ | |
1294 | if (!full_table) { | |
1295 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
1296 | tt_len = bat_priv->tt_buff_len; | |
1297 | tt_tot = tt_len / sizeof(struct tt_change); | |
1298 | ||
1299 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + | |
1300 | tt_len + ETH_HLEN); | |
1301 | if (!skb) | |
1302 | goto unlock; | |
1303 | ||
1304 | skb_reserve(skb, ETH_HLEN); | |
1305 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1306 | sizeof(struct tt_query_packet) + tt_len); | |
1307 | tt_response->ttvn = req_ttvn; | |
1308 | tt_response->tt_data = htons(tt_tot); | |
1309 | ||
1310 | tt_buff = skb->data + sizeof(struct tt_query_packet); | |
1311 | memcpy(tt_buff, bat_priv->tt_buff, | |
1312 | bat_priv->tt_buff_len); | |
1313 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1314 | } else { | |
1315 | tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) * | |
1316 | sizeof(struct tt_change); | |
1317 | ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1318 | ||
1319 | skb = tt_response_fill_table(tt_len, ttvn, | |
1320 | bat_priv->tt_local_hash, | |
058d0e26 AQ |
1321 | primary_if, tt_local_valid_entry, |
1322 | NULL); | |
a73105b8 AQ |
1323 | if (!skb) |
1324 | goto out; | |
1325 | ||
1326 | tt_response = (struct tt_query_packet *)skb->data; | |
1327 | } | |
1328 | ||
1329 | tt_response->packet_type = BAT_TT_QUERY; | |
1330 | tt_response->version = COMPAT_VERSION; | |
1331 | tt_response->ttl = TTL; | |
1332 | memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN); | |
1333 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
1334 | tt_response->flags = TT_RESPONSE; | |
1335 | ||
1336 | if (full_table) | |
1337 | tt_response->flags |= TT_FULL_TABLE; | |
1338 | ||
1339 | bat_dbg(DBG_TT, bat_priv, | |
1340 | "Sending TT_RESPONSE to %pM via %pM [%c]\n", | |
1341 | orig_node->orig, neigh_node->addr, | |
1342 | (tt_response->flags & TT_FULL_TABLE ? 'F' : '.')); | |
1343 | ||
1344 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1345 | ret = true; | |
1346 | goto out; | |
1347 | ||
1348 | unlock: | |
1349 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1350 | out: | |
1351 | if (orig_node) | |
1352 | orig_node_free_ref(orig_node); | |
1353 | if (neigh_node) | |
1354 | neigh_node_free_ref(neigh_node); | |
1355 | if (primary_if) | |
1356 | hardif_free_ref(primary_if); | |
1357 | if (!ret) | |
1358 | kfree_skb(skb); | |
1359 | /* This packet was for me, so it doesn't need to be re-routed */ | |
1360 | return true; | |
1361 | } | |
1362 | ||
1363 | bool send_tt_response(struct bat_priv *bat_priv, | |
1364 | struct tt_query_packet *tt_request) | |
1365 | { | |
1366 | if (is_my_mac(tt_request->dst)) | |
1367 | return send_my_tt_response(bat_priv, tt_request); | |
1368 | else | |
1369 | return send_other_tt_response(bat_priv, tt_request); | |
1370 | } | |
1371 | ||
1372 | static void _tt_update_changes(struct bat_priv *bat_priv, | |
1373 | struct orig_node *orig_node, | |
1374 | struct tt_change *tt_change, | |
1375 | uint16_t tt_num_changes, uint8_t ttvn) | |
1376 | { | |
1377 | int i; | |
1378 | ||
1379 | for (i = 0; i < tt_num_changes; i++) { | |
5fbc1598 | 1380 | if ((tt_change + i)->flags & TT_CLIENT_DEL) |
a73105b8 AQ |
1381 | tt_global_del(bat_priv, orig_node, |
1382 | (tt_change + i)->addr, | |
cc47f66e AQ |
1383 | "tt removed by changes", |
1384 | (tt_change + i)->flags & TT_CLIENT_ROAM); | |
a73105b8 AQ |
1385 | else |
1386 | if (!tt_global_add(bat_priv, orig_node, | |
bc279080 AQ |
1387 | (tt_change + i)->addr, ttvn, false, |
1388 | (tt_change + i)->flags & | |
1389 | TT_CLIENT_WIFI)) | |
a73105b8 AQ |
1390 | /* In case of problem while storing a |
1391 | * global_entry, we stop the updating | |
1392 | * procedure without committing the | |
1393 | * ttvn change. This will avoid to send | |
1394 | * corrupted data on tt_request | |
1395 | */ | |
1396 | return; | |
1397 | } | |
1398 | } | |
1399 | ||
1400 | static void tt_fill_gtable(struct bat_priv *bat_priv, | |
1401 | struct tt_query_packet *tt_response) | |
1402 | { | |
1403 | struct orig_node *orig_node = NULL; | |
1404 | ||
1405 | orig_node = orig_hash_find(bat_priv, tt_response->src); | |
1406 | if (!orig_node) | |
1407 | goto out; | |
1408 | ||
1409 | /* Purge the old table first.. */ | |
1410 | tt_global_del_orig(bat_priv, orig_node, "Received full table"); | |
1411 | ||
1412 | _tt_update_changes(bat_priv, orig_node, | |
1413 | (struct tt_change *)(tt_response + 1), | |
1414 | tt_response->tt_data, tt_response->ttvn); | |
1415 | ||
1416 | spin_lock_bh(&orig_node->tt_buff_lock); | |
1417 | kfree(orig_node->tt_buff); | |
1418 | orig_node->tt_buff_len = 0; | |
1419 | orig_node->tt_buff = NULL; | |
1420 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1421 | ||
1422 | atomic_set(&orig_node->last_ttvn, tt_response->ttvn); | |
1423 | ||
1424 | out: | |
1425 | if (orig_node) | |
1426 | orig_node_free_ref(orig_node); | |
1427 | } | |
1428 | ||
a943cac1 ML |
1429 | static void tt_update_changes(struct bat_priv *bat_priv, |
1430 | struct orig_node *orig_node, | |
1431 | uint16_t tt_num_changes, uint8_t ttvn, | |
1432 | struct tt_change *tt_change) | |
a73105b8 AQ |
1433 | { |
1434 | _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes, | |
1435 | ttvn); | |
1436 | ||
1437 | tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change, | |
1438 | tt_num_changes); | |
1439 | atomic_set(&orig_node->last_ttvn, ttvn); | |
1440 | } | |
1441 | ||
1442 | bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr) | |
1443 | { | |
7683fdc1 AQ |
1444 | struct tt_local_entry *tt_local_entry = NULL; |
1445 | bool ret = false; | |
a73105b8 | 1446 | |
a73105b8 | 1447 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
1448 | if (!tt_local_entry) |
1449 | goto out; | |
058d0e26 AQ |
1450 | /* Check if the client has been logically deleted (but is kept for |
1451 | * consistency purpose) */ | |
1452 | if (tt_local_entry->flags & TT_CLIENT_PENDING) | |
1453 | goto out; | |
7683fdc1 AQ |
1454 | ret = true; |
1455 | out: | |
a73105b8 | 1456 | if (tt_local_entry) |
7683fdc1 AQ |
1457 | tt_local_entry_free_ref(tt_local_entry); |
1458 | return ret; | |
a73105b8 AQ |
1459 | } |
1460 | ||
1461 | void handle_tt_response(struct bat_priv *bat_priv, | |
1462 | struct tt_query_packet *tt_response) | |
1463 | { | |
1464 | struct tt_req_node *node, *safe; | |
1465 | struct orig_node *orig_node = NULL; | |
1466 | ||
1467 | bat_dbg(DBG_TT, bat_priv, "Received TT_RESPONSE from %pM for " | |
1468 | "ttvn %d t_size: %d [%c]\n", | |
1469 | tt_response->src, tt_response->ttvn, | |
1470 | tt_response->tt_data, | |
1471 | (tt_response->flags & TT_FULL_TABLE ? 'F' : '.')); | |
1472 | ||
1473 | orig_node = orig_hash_find(bat_priv, tt_response->src); | |
1474 | if (!orig_node) | |
1475 | goto out; | |
1476 | ||
1477 | if (tt_response->flags & TT_FULL_TABLE) | |
1478 | tt_fill_gtable(bat_priv, tt_response); | |
1479 | else | |
1480 | tt_update_changes(bat_priv, orig_node, tt_response->tt_data, | |
1481 | tt_response->ttvn, | |
1482 | (struct tt_change *)(tt_response + 1)); | |
1483 | ||
1484 | /* Delete the tt_req_node from pending tt_requests list */ | |
1485 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1486 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
1487 | if (!compare_eth(node->addr, tt_response->src)) | |
1488 | continue; | |
1489 | list_del(&node->list); | |
1490 | kfree(node); | |
1491 | } | |
1492 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1493 | ||
1494 | /* Recalculate the CRC for this orig_node and store it */ | |
a73105b8 | 1495 | orig_node->tt_crc = tt_global_crc(bat_priv, orig_node); |
cc47f66e AQ |
1496 | /* Roaming phase is over: tables are in sync again. I can |
1497 | * unset the flag */ | |
1498 | orig_node->tt_poss_change = false; | |
a73105b8 AQ |
1499 | out: |
1500 | if (orig_node) | |
1501 | orig_node_free_ref(orig_node); | |
1502 | } | |
1503 | ||
1504 | int tt_init(struct bat_priv *bat_priv) | |
1505 | { | |
1506 | if (!tt_local_init(bat_priv)) | |
1507 | return 0; | |
1508 | ||
1509 | if (!tt_global_init(bat_priv)) | |
1510 | return 0; | |
1511 | ||
1512 | tt_start_timer(bat_priv); | |
1513 | ||
1514 | return 1; | |
1515 | } | |
1516 | ||
cc47f66e | 1517 | static void tt_roam_list_free(struct bat_priv *bat_priv) |
a73105b8 | 1518 | { |
cc47f66e | 1519 | struct tt_roam_node *node, *safe; |
a73105b8 | 1520 | |
cc47f66e | 1521 | spin_lock_bh(&bat_priv->tt_roam_list_lock); |
a73105b8 | 1522 | |
cc47f66e AQ |
1523 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { |
1524 | list_del(&node->list); | |
1525 | kfree(node); | |
1526 | } | |
1527 | ||
1528 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1529 | } | |
1530 | ||
1531 | static void tt_roam_purge(struct bat_priv *bat_priv) | |
1532 | { | |
1533 | struct tt_roam_node *node, *safe; | |
1534 | ||
1535 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1536 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { | |
1537 | if (!is_out_of_time(node->first_time, | |
1538 | ROAMING_MAX_TIME * 1000)) | |
1539 | continue; | |
1540 | ||
1541 | list_del(&node->list); | |
1542 | kfree(node); | |
1543 | } | |
1544 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1545 | } | |
1546 | ||
1547 | /* This function checks whether the client already reached the | |
1548 | * maximum number of possible roaming phases. In this case the ROAMING_ADV | |
1549 | * will not be sent. | |
1550 | * | |
1551 | * returns true if the ROAMING_ADV can be sent, false otherwise */ | |
1552 | static bool tt_check_roam_count(struct bat_priv *bat_priv, | |
1553 | uint8_t *client) | |
1554 | { | |
1555 | struct tt_roam_node *tt_roam_node; | |
1556 | bool ret = false; | |
1557 | ||
1558 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1559 | /* The new tt_req will be issued only if I'm not waiting for a | |
1560 | * reply from the same orig_node yet */ | |
1561 | list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) { | |
1562 | if (!compare_eth(tt_roam_node->addr, client)) | |
1563 | continue; | |
1564 | ||
1565 | if (is_out_of_time(tt_roam_node->first_time, | |
1566 | ROAMING_MAX_TIME * 1000)) | |
1567 | continue; | |
1568 | ||
1569 | if (!atomic_dec_not_zero(&tt_roam_node->counter)) | |
1570 | /* Sorry, you roamed too many times! */ | |
1571 | goto unlock; | |
1572 | ret = true; | |
1573 | break; | |
1574 | } | |
1575 | ||
1576 | if (!ret) { | |
1577 | tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); | |
1578 | if (!tt_roam_node) | |
1579 | goto unlock; | |
1580 | ||
1581 | tt_roam_node->first_time = jiffies; | |
1582 | atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1); | |
1583 | memcpy(tt_roam_node->addr, client, ETH_ALEN); | |
1584 | ||
1585 | list_add(&tt_roam_node->list, &bat_priv->tt_roam_list); | |
1586 | ret = true; | |
1587 | } | |
1588 | ||
1589 | unlock: | |
1590 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1591 | return ret; | |
1592 | } | |
1593 | ||
1594 | void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client, | |
1595 | struct orig_node *orig_node) | |
1596 | { | |
1597 | struct neigh_node *neigh_node = NULL; | |
1598 | struct sk_buff *skb = NULL; | |
1599 | struct roam_adv_packet *roam_adv_packet; | |
1600 | int ret = 1; | |
1601 | struct hard_iface *primary_if; | |
1602 | ||
1603 | /* before going on we have to check whether the client has | |
1604 | * already roamed to us too many times */ | |
1605 | if (!tt_check_roam_count(bat_priv, client)) | |
1606 | goto out; | |
1607 | ||
1608 | skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN); | |
1609 | if (!skb) | |
1610 | goto out; | |
1611 | ||
1612 | skb_reserve(skb, ETH_HLEN); | |
1613 | ||
1614 | roam_adv_packet = (struct roam_adv_packet *)skb_put(skb, | |
1615 | sizeof(struct roam_adv_packet)); | |
1616 | ||
1617 | roam_adv_packet->packet_type = BAT_ROAM_ADV; | |
1618 | roam_adv_packet->version = COMPAT_VERSION; | |
1619 | roam_adv_packet->ttl = TTL; | |
1620 | primary_if = primary_if_get_selected(bat_priv); | |
1621 | if (!primary_if) | |
1622 | goto out; | |
1623 | memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN); | |
1624 | hardif_free_ref(primary_if); | |
1625 | memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN); | |
1626 | memcpy(roam_adv_packet->client, client, ETH_ALEN); | |
1627 | ||
1628 | neigh_node = orig_node_get_router(orig_node); | |
1629 | if (!neigh_node) | |
1630 | goto out; | |
1631 | ||
1632 | bat_dbg(DBG_TT, bat_priv, | |
1633 | "Sending ROAMING_ADV to %pM (client %pM) via %pM\n", | |
1634 | orig_node->orig, client, neigh_node->addr); | |
1635 | ||
1636 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1637 | ret = 0; | |
1638 | ||
1639 | out: | |
1640 | if (neigh_node) | |
1641 | neigh_node_free_ref(neigh_node); | |
1642 | if (ret) | |
1643 | kfree_skb(skb); | |
1644 | return; | |
a73105b8 AQ |
1645 | } |
1646 | ||
1647 | static void tt_purge(struct work_struct *work) | |
1648 | { | |
1649 | struct delayed_work *delayed_work = | |
1650 | container_of(work, struct delayed_work, work); | |
1651 | struct bat_priv *bat_priv = | |
1652 | container_of(delayed_work, struct bat_priv, tt_work); | |
1653 | ||
1654 | tt_local_purge(bat_priv); | |
cc47f66e | 1655 | tt_global_roam_purge(bat_priv); |
a73105b8 | 1656 | tt_req_purge(bat_priv); |
cc47f66e | 1657 | tt_roam_purge(bat_priv); |
a73105b8 AQ |
1658 | |
1659 | tt_start_timer(bat_priv); | |
1660 | } | |
cc47f66e AQ |
1661 | |
1662 | void tt_free(struct bat_priv *bat_priv) | |
1663 | { | |
1664 | cancel_delayed_work_sync(&bat_priv->tt_work); | |
1665 | ||
1666 | tt_local_table_free(bat_priv); | |
1667 | tt_global_table_free(bat_priv); | |
1668 | tt_req_list_free(bat_priv); | |
1669 | tt_changes_list_free(bat_priv); | |
1670 | tt_roam_list_free(bat_priv); | |
1671 | ||
1672 | kfree(bat_priv->tt_buff); | |
1673 | } | |
058d0e26 AQ |
1674 | |
1675 | /* This function will reset the specified flags from all the entries in | |
1676 | * the given hash table and will increment num_local_tt for each involved | |
1677 | * entry */ | |
1678 | static void tt_local_reset_flags(struct bat_priv *bat_priv, uint16_t flags) | |
1679 | { | |
c90681b8 | 1680 | uint32_t i; |
058d0e26 AQ |
1681 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
1682 | struct hlist_head *head; | |
1683 | struct hlist_node *node; | |
1684 | struct tt_local_entry *tt_local_entry; | |
1685 | ||
1686 | if (!hash) | |
1687 | return; | |
1688 | ||
1689 | for (i = 0; i < hash->size; i++) { | |
1690 | head = &hash->table[i]; | |
1691 | ||
1692 | rcu_read_lock(); | |
1693 | hlist_for_each_entry_rcu(tt_local_entry, node, | |
1694 | head, hash_entry) { | |
31901264 AQ |
1695 | if (!(tt_local_entry->flags & flags)) |
1696 | continue; | |
058d0e26 AQ |
1697 | tt_local_entry->flags &= ~flags; |
1698 | atomic_inc(&bat_priv->num_local_tt); | |
1699 | } | |
1700 | rcu_read_unlock(); | |
1701 | } | |
1702 | ||
1703 | } | |
1704 | ||
1705 | /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */ | |
1706 | static void tt_local_purge_pending_clients(struct bat_priv *bat_priv) | |
1707 | { | |
1708 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
1709 | struct tt_local_entry *tt_local_entry; | |
1710 | struct hlist_node *node, *node_tmp; | |
1711 | struct hlist_head *head; | |
1712 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
c90681b8 | 1713 | uint32_t i; |
058d0e26 AQ |
1714 | |
1715 | if (!hash) | |
1716 | return; | |
1717 | ||
1718 | for (i = 0; i < hash->size; i++) { | |
1719 | head = &hash->table[i]; | |
1720 | list_lock = &hash->list_locks[i]; | |
1721 | ||
1722 | spin_lock_bh(list_lock); | |
1723 | hlist_for_each_entry_safe(tt_local_entry, node, node_tmp, | |
1724 | head, hash_entry) { | |
1725 | if (!(tt_local_entry->flags & TT_CLIENT_PENDING)) | |
1726 | continue; | |
1727 | ||
1728 | bat_dbg(DBG_TT, bat_priv, "Deleting local tt entry " | |
1729 | "(%pM): pending\n", tt_local_entry->addr); | |
1730 | ||
1731 | atomic_dec(&bat_priv->num_local_tt); | |
1732 | hlist_del_rcu(node); | |
1733 | tt_local_entry_free_ref(tt_local_entry); | |
1734 | } | |
1735 | spin_unlock_bh(list_lock); | |
1736 | } | |
1737 | ||
1738 | } | |
1739 | ||
1740 | void tt_commit_changes(struct bat_priv *bat_priv) | |
1741 | { | |
1742 | tt_local_reset_flags(bat_priv, TT_CLIENT_NEW); | |
1743 | tt_local_purge_pending_clients(bat_priv); | |
1744 | ||
1745 | /* Increment the TTVN only once per OGM interval */ | |
1746 | atomic_inc(&bat_priv->ttvn); | |
1747 | bat_priv->tt_poss_change = false; | |
1748 | } | |
59b699cd AQ |
1749 | |
1750 | bool is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, uint8_t *dst) | |
1751 | { | |
1752 | struct tt_local_entry *tt_local_entry = NULL; | |
1753 | struct tt_global_entry *tt_global_entry = NULL; | |
1754 | bool ret = true; | |
1755 | ||
1756 | if (!atomic_read(&bat_priv->ap_isolation)) | |
1757 | return false; | |
1758 | ||
1759 | tt_local_entry = tt_local_hash_find(bat_priv, dst); | |
1760 | if (!tt_local_entry) | |
1761 | goto out; | |
1762 | ||
1763 | tt_global_entry = tt_global_hash_find(bat_priv, src); | |
1764 | if (!tt_global_entry) | |
1765 | goto out; | |
1766 | ||
1767 | if (_is_ap_isolated(tt_local_entry, tt_global_entry)) | |
1768 | goto out; | |
1769 | ||
1770 | ret = false; | |
1771 | ||
1772 | out: | |
1773 | if (tt_global_entry) | |
1774 | tt_global_entry_free_ref(tt_global_entry); | |
1775 | if (tt_local_entry) | |
1776 | tt_local_entry_free_ref(tt_local_entry); | |
1777 | return ret; | |
1778 | } | |
a943cac1 ML |
1779 | |
1780 | void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
1781 | const unsigned char *tt_buff, uint8_t tt_num_changes, | |
1782 | uint8_t ttvn, uint16_t tt_crc) | |
1783 | { | |
1784 | uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
1785 | bool full_table = true; | |
1786 | ||
1787 | /* the ttvn increased by one -> we can apply the attached changes */ | |
1788 | if (ttvn - orig_ttvn == 1) { | |
1789 | /* the OGM could not contain the changes due to their size or | |
1790 | * because they have already been sent TT_OGM_APPEND_MAX times. | |
1791 | * In this case send a tt request */ | |
1792 | if (!tt_num_changes) { | |
1793 | full_table = false; | |
1794 | goto request_table; | |
1795 | } | |
1796 | ||
1797 | tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn, | |
1798 | (struct tt_change *)tt_buff); | |
1799 | ||
1800 | /* Even if we received the precomputed crc with the OGM, we | |
1801 | * prefer to recompute it to spot any possible inconsistency | |
1802 | * in the global table */ | |
1803 | orig_node->tt_crc = tt_global_crc(bat_priv, orig_node); | |
1804 | ||
1805 | /* The ttvn alone is not enough to guarantee consistency | |
1806 | * because a single value could represent different states | |
1807 | * (due to the wrap around). Thus a node has to check whether | |
1808 | * the resulting table (after applying the changes) is still | |
1809 | * consistent or not. E.g. a node could disconnect while its | |
1810 | * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case | |
1811 | * checking the CRC value is mandatory to detect the | |
1812 | * inconsistency */ | |
1813 | if (orig_node->tt_crc != tt_crc) | |
1814 | goto request_table; | |
1815 | ||
1816 | /* Roaming phase is over: tables are in sync again. I can | |
1817 | * unset the flag */ | |
1818 | orig_node->tt_poss_change = false; | |
1819 | } else { | |
1820 | /* if we missed more than one change or our tables are not | |
1821 | * in sync anymore -> request fresh tt data */ | |
1822 | if (ttvn != orig_ttvn || orig_node->tt_crc != tt_crc) { | |
1823 | request_table: | |
1824 | bat_dbg(DBG_TT, bat_priv, "TT inconsistency for %pM. " | |
1825 | "Need to retrieve the correct information " | |
1826 | "(ttvn: %u last_ttvn: %u crc: %u last_crc: " | |
1827 | "%u num_changes: %u)\n", orig_node->orig, ttvn, | |
1828 | orig_ttvn, tt_crc, orig_node->tt_crc, | |
1829 | tt_num_changes); | |
1830 | send_tt_request(bat_priv, orig_node, ttvn, tt_crc, | |
1831 | full_table); | |
1832 | return; | |
1833 | } | |
1834 | } | |
1835 | } |