Commit | Line | Data |
---|---|---|
c6c8fea2 | 1 | /* |
567db7b0 | 2 | * Copyright (C) 2007-2012 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 | ||
de7aae65 SE |
33 | static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client, |
34 | struct orig_node *orig_node); | |
a73105b8 AQ |
35 | static void _tt_global_del(struct bat_priv *bat_priv, |
36 | struct tt_global_entry *tt_global_entry, | |
37 | const char *message); | |
38 | static void tt_purge(struct work_struct *work); | |
c6c8fea2 | 39 | |
7aadf889 | 40 | /* returns 1 if they are the same mac addr */ |
48100bac | 41 | static int compare_tt(const struct hlist_node *node, const void *data2) |
7aadf889 | 42 | { |
48100bac | 43 | const void *data1 = container_of(node, struct tt_common_entry, |
747e4221 | 44 | hash_entry); |
7aadf889 ML |
45 | |
46 | return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); | |
47 | } | |
48 | ||
a73105b8 | 49 | static void tt_start_timer(struct bat_priv *bat_priv) |
c6c8fea2 | 50 | { |
a73105b8 AQ |
51 | INIT_DELAYED_WORK(&bat_priv->tt_work, tt_purge); |
52 | queue_delayed_work(bat_event_workqueue, &bat_priv->tt_work, | |
53 | msecs_to_jiffies(5000)); | |
c6c8fea2 SE |
54 | } |
55 | ||
48100bac AQ |
56 | static struct tt_common_entry *tt_hash_find(struct hashtable_t *hash, |
57 | const void *data) | |
7aadf889 | 58 | { |
7aadf889 ML |
59 | struct hlist_head *head; |
60 | struct hlist_node *node; | |
48100bac | 61 | struct tt_common_entry *tt_common_entry, *tt_common_entry_tmp = NULL; |
c90681b8 | 62 | uint32_t index; |
7aadf889 ML |
63 | |
64 | if (!hash) | |
65 | return NULL; | |
66 | ||
67 | index = choose_orig(data, hash->size); | |
68 | head = &hash->table[index]; | |
69 | ||
70 | rcu_read_lock(); | |
48100bac AQ |
71 | hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) { |
72 | if (!compare_eth(tt_common_entry, data)) | |
7aadf889 ML |
73 | continue; |
74 | ||
48100bac | 75 | if (!atomic_inc_not_zero(&tt_common_entry->refcount)) |
7683fdc1 AQ |
76 | continue; |
77 | ||
48100bac | 78 | tt_common_entry_tmp = tt_common_entry; |
7aadf889 ML |
79 | break; |
80 | } | |
81 | rcu_read_unlock(); | |
82 | ||
48100bac | 83 | return tt_common_entry_tmp; |
7aadf889 ML |
84 | } |
85 | ||
48100bac AQ |
86 | static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv, |
87 | const void *data) | |
7aadf889 | 88 | { |
48100bac AQ |
89 | struct tt_common_entry *tt_common_entry; |
90 | struct tt_local_entry *tt_local_entry = NULL; | |
7aadf889 | 91 | |
48100bac AQ |
92 | tt_common_entry = tt_hash_find(bat_priv->tt_local_hash, data); |
93 | if (tt_common_entry) | |
94 | tt_local_entry = container_of(tt_common_entry, | |
95 | struct tt_local_entry, common); | |
96 | return tt_local_entry; | |
97 | } | |
7aadf889 | 98 | |
48100bac AQ |
99 | static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv, |
100 | const void *data) | |
101 | { | |
102 | struct tt_common_entry *tt_common_entry; | |
103 | struct tt_global_entry *tt_global_entry = NULL; | |
7683fdc1 | 104 | |
48100bac AQ |
105 | tt_common_entry = tt_hash_find(bat_priv->tt_global_hash, data); |
106 | if (tt_common_entry) | |
107 | tt_global_entry = container_of(tt_common_entry, | |
108 | struct tt_global_entry, common); | |
109 | return tt_global_entry; | |
7aadf889 | 110 | |
7aadf889 ML |
111 | } |
112 | ||
7683fdc1 AQ |
113 | static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry) |
114 | { | |
48100bac AQ |
115 | if (atomic_dec_and_test(&tt_local_entry->common.refcount)) |
116 | kfree_rcu(tt_local_entry, common.rcu); | |
7683fdc1 AQ |
117 | } |
118 | ||
531027fc SW |
119 | static void tt_global_entry_free_rcu(struct rcu_head *rcu) |
120 | { | |
48100bac | 121 | struct tt_common_entry *tt_common_entry; |
531027fc SW |
122 | struct tt_global_entry *tt_global_entry; |
123 | ||
48100bac AQ |
124 | tt_common_entry = container_of(rcu, struct tt_common_entry, rcu); |
125 | tt_global_entry = container_of(tt_common_entry, struct tt_global_entry, | |
126 | common); | |
531027fc SW |
127 | |
128 | if (tt_global_entry->orig_node) | |
129 | orig_node_free_ref(tt_global_entry->orig_node); | |
130 | ||
131 | kfree(tt_global_entry); | |
132 | } | |
133 | ||
7683fdc1 AQ |
134 | static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry) |
135 | { | |
48100bac AQ |
136 | if (atomic_dec_and_test(&tt_global_entry->common.refcount)) |
137 | call_rcu(&tt_global_entry->common.rcu, | |
138 | tt_global_entry_free_rcu); | |
7683fdc1 AQ |
139 | } |
140 | ||
ff66c975 AQ |
141 | static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr, |
142 | uint8_t flags) | |
a73105b8 AQ |
143 | { |
144 | struct tt_change_node *tt_change_node; | |
145 | ||
146 | tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC); | |
147 | ||
148 | if (!tt_change_node) | |
149 | return; | |
150 | ||
ff66c975 | 151 | tt_change_node->change.flags = flags; |
a73105b8 AQ |
152 | memcpy(tt_change_node->change.addr, addr, ETH_ALEN); |
153 | ||
154 | spin_lock_bh(&bat_priv->tt_changes_list_lock); | |
155 | /* track the change in the OGMinterval list */ | |
156 | list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list); | |
157 | atomic_inc(&bat_priv->tt_local_changes); | |
158 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); | |
159 | ||
160 | atomic_set(&bat_priv->tt_ogm_append_cnt, 0); | |
161 | } | |
162 | ||
163 | int tt_len(int changes_num) | |
164 | { | |
165 | return changes_num * sizeof(struct tt_change); | |
166 | } | |
167 | ||
168 | static int tt_local_init(struct bat_priv *bat_priv) | |
c6c8fea2 | 169 | { |
2dafb49d | 170 | if (bat_priv->tt_local_hash) |
c6c8fea2 SE |
171 | return 1; |
172 | ||
2dafb49d | 173 | bat_priv->tt_local_hash = hash_new(1024); |
c6c8fea2 | 174 | |
2dafb49d | 175 | if (!bat_priv->tt_local_hash) |
c6c8fea2 SE |
176 | return 0; |
177 | ||
c6c8fea2 SE |
178 | return 1; |
179 | } | |
180 | ||
bc279080 AQ |
181 | void tt_local_add(struct net_device *soft_iface, const uint8_t *addr, |
182 | int ifindex) | |
c6c8fea2 SE |
183 | { |
184 | struct bat_priv *bat_priv = netdev_priv(soft_iface); | |
7683fdc1 AQ |
185 | struct tt_local_entry *tt_local_entry = NULL; |
186 | struct tt_global_entry *tt_global_entry = NULL; | |
80b3f58c | 187 | int hash_added; |
c6c8fea2 | 188 | |
2dafb49d | 189 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
c6c8fea2 | 190 | |
2dafb49d AQ |
191 | if (tt_local_entry) { |
192 | tt_local_entry->last_seen = jiffies; | |
7683fdc1 | 193 | goto out; |
c6c8fea2 SE |
194 | } |
195 | ||
704509b8 | 196 | tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC); |
2dafb49d | 197 | if (!tt_local_entry) |
7683fdc1 | 198 | goto out; |
a73105b8 | 199 | |
a73105b8 AQ |
200 | bat_dbg(DBG_TT, bat_priv, |
201 | "Creating new local tt entry: %pM (ttvn: %d)\n", addr, | |
202 | (uint8_t)atomic_read(&bat_priv->ttvn)); | |
c6c8fea2 | 203 | |
48100bac AQ |
204 | memcpy(tt_local_entry->common.addr, addr, ETH_ALEN); |
205 | tt_local_entry->common.flags = NO_FLAGS; | |
bc279080 | 206 | if (is_wifi_iface(ifindex)) |
48100bac AQ |
207 | tt_local_entry->common.flags |= TT_CLIENT_WIFI; |
208 | atomic_set(&tt_local_entry->common.refcount, 2); | |
209 | tt_local_entry->last_seen = jiffies; | |
c6c8fea2 SE |
210 | |
211 | /* the batman interface mac address should never be purged */ | |
39901e71 | 212 | if (compare_eth(addr, soft_iface->dev_addr)) |
48100bac | 213 | tt_local_entry->common.flags |= TT_CLIENT_NOPURGE; |
c6c8fea2 | 214 | |
c40ed2bf AQ |
215 | /* The local entry has to be marked as NEW to avoid to send it in |
216 | * a full table response going out before the next ttvn increment | |
217 | * (consistency check) */ | |
218 | tt_local_entry->common.flags |= TT_CLIENT_NEW; | |
219 | ||
80b3f58c SW |
220 | hash_added = hash_add(bat_priv->tt_local_hash, compare_tt, choose_orig, |
221 | &tt_local_entry->common, | |
222 | &tt_local_entry->common.hash_entry); | |
223 | ||
224 | if (unlikely(hash_added != 0)) { | |
225 | /* remove the reference for the hash */ | |
226 | tt_local_entry_free_ref(tt_local_entry); | |
227 | goto out; | |
228 | } | |
229 | ||
48100bac | 230 | tt_local_event(bat_priv, addr, tt_local_entry->common.flags); |
ff66c975 | 231 | |
c6c8fea2 | 232 | /* remove address from global hash if present */ |
2dafb49d | 233 | tt_global_entry = tt_global_hash_find(bat_priv, addr); |
c6c8fea2 | 234 | |
cc47f66e AQ |
235 | /* Check whether it is a roaming! */ |
236 | if (tt_global_entry) { | |
cc47f66e AQ |
237 | /* This node is probably going to update its tt table */ |
238 | tt_global_entry->orig_node->tt_poss_change = true; | |
03fc3070 | 239 | /* The global entry has to be marked as ROAMING and has to be |
980d55b2 | 240 | * kept for consistency purpose */ |
220b07e9 | 241 | tt_global_entry->common.flags |= TT_CLIENT_ROAM; |
03fc3070 | 242 | tt_global_entry->roam_at = jiffies; |
48100bac | 243 | send_roam_adv(bat_priv, tt_global_entry->common.addr, |
7683fdc1 AQ |
244 | tt_global_entry->orig_node); |
245 | } | |
246 | out: | |
247 | if (tt_local_entry) | |
248 | tt_local_entry_free_ref(tt_local_entry); | |
249 | if (tt_global_entry) | |
250 | tt_global_entry_free_ref(tt_global_entry); | |
c6c8fea2 SE |
251 | } |
252 | ||
a73105b8 AQ |
253 | int tt_changes_fill_buffer(struct bat_priv *bat_priv, |
254 | unsigned char *buff, int buff_len) | |
c6c8fea2 | 255 | { |
a73105b8 AQ |
256 | int count = 0, tot_changes = 0; |
257 | struct tt_change_node *entry, *safe; | |
c6c8fea2 | 258 | |
a73105b8 AQ |
259 | if (buff_len > 0) |
260 | tot_changes = buff_len / tt_len(1); | |
c6c8fea2 | 261 | |
a73105b8 AQ |
262 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
263 | atomic_set(&bat_priv->tt_local_changes, 0); | |
c6c8fea2 | 264 | |
a73105b8 | 265 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
7c64fd98 | 266 | list) { |
a73105b8 AQ |
267 | if (count < tot_changes) { |
268 | memcpy(buff + tt_len(count), | |
269 | &entry->change, sizeof(struct tt_change)); | |
c6c8fea2 SE |
270 | count++; |
271 | } | |
a73105b8 AQ |
272 | list_del(&entry->list); |
273 | kfree(entry); | |
c6c8fea2 | 274 | } |
a73105b8 AQ |
275 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); |
276 | ||
277 | /* Keep the buffer for possible tt_request */ | |
278 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
279 | kfree(bat_priv->tt_buff); | |
280 | bat_priv->tt_buff_len = 0; | |
281 | bat_priv->tt_buff = NULL; | |
282 | /* We check whether this new OGM has no changes due to size | |
283 | * problems */ | |
284 | if (buff_len > 0) { | |
285 | /** | |
286 | * if kmalloc() fails we will reply with the full table | |
287 | * instead of providing the diff | |
288 | */ | |
289 | bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC); | |
290 | if (bat_priv->tt_buff) { | |
291 | memcpy(bat_priv->tt_buff, buff, buff_len); | |
292 | bat_priv->tt_buff_len = buff_len; | |
293 | } | |
294 | } | |
295 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
c6c8fea2 | 296 | |
a73105b8 | 297 | return tot_changes; |
c6c8fea2 SE |
298 | } |
299 | ||
2dafb49d | 300 | int tt_local_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
301 | { |
302 | struct net_device *net_dev = (struct net_device *)seq->private; | |
303 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
2dafb49d | 304 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
48100bac | 305 | struct tt_common_entry *tt_common_entry; |
32ae9b22 | 306 | struct hard_iface *primary_if; |
7aadf889 | 307 | struct hlist_node *node; |
c6c8fea2 | 308 | struct hlist_head *head; |
c90681b8 AQ |
309 | uint32_t i; |
310 | int ret = 0; | |
32ae9b22 ML |
311 | |
312 | primary_if = primary_if_get_selected(bat_priv); | |
313 | if (!primary_if) { | |
86ceb360 SE |
314 | ret = seq_printf(seq, |
315 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
316 | net_dev->name); |
317 | goto out; | |
318 | } | |
c6c8fea2 | 319 | |
32ae9b22 | 320 | if (primary_if->if_status != IF_ACTIVE) { |
86ceb360 SE |
321 | ret = seq_printf(seq, |
322 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
323 | net_dev->name); |
324 | goto out; | |
c6c8fea2 SE |
325 | } |
326 | ||
86ceb360 SE |
327 | seq_printf(seq, |
328 | "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n", | |
a73105b8 | 329 | net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn)); |
c6c8fea2 | 330 | |
c6c8fea2 SE |
331 | for (i = 0; i < hash->size; i++) { |
332 | head = &hash->table[i]; | |
333 | ||
7aadf889 | 334 | rcu_read_lock(); |
48100bac | 335 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 336 | head, hash_entry) { |
d099c2c5 | 337 | seq_printf(seq, " * %pM [%c%c%c%c%c]\n", |
7c64fd98 SE |
338 | tt_common_entry->addr, |
339 | (tt_common_entry->flags & | |
340 | TT_CLIENT_ROAM ? 'R' : '.'), | |
341 | (tt_common_entry->flags & | |
342 | TT_CLIENT_NOPURGE ? 'P' : '.'), | |
343 | (tt_common_entry->flags & | |
344 | TT_CLIENT_NEW ? 'N' : '.'), | |
345 | (tt_common_entry->flags & | |
346 | TT_CLIENT_PENDING ? 'X' : '.'), | |
347 | (tt_common_entry->flags & | |
348 | TT_CLIENT_WIFI ? 'W' : '.')); | |
c6c8fea2 | 349 | } |
7aadf889 | 350 | rcu_read_unlock(); |
c6c8fea2 | 351 | } |
32ae9b22 ML |
352 | out: |
353 | if (primary_if) | |
354 | hardif_free_ref(primary_if); | |
355 | return ret; | |
c6c8fea2 SE |
356 | } |
357 | ||
058d0e26 AQ |
358 | static void tt_local_set_pending(struct bat_priv *bat_priv, |
359 | struct tt_local_entry *tt_local_entry, | |
c566dbbe | 360 | uint16_t flags, const char *message) |
c6c8fea2 | 361 | { |
48100bac AQ |
362 | tt_local_event(bat_priv, tt_local_entry->common.addr, |
363 | tt_local_entry->common.flags | flags); | |
a73105b8 | 364 | |
015758d0 AQ |
365 | /* The local client has to be marked as "pending to be removed" but has |
366 | * to be kept in the table in order to send it in a full table | |
058d0e26 | 367 | * response issued before the net ttvn increment (consistency check) */ |
48100bac | 368 | tt_local_entry->common.flags |= TT_CLIENT_PENDING; |
c566dbbe | 369 | |
86ceb360 SE |
370 | bat_dbg(DBG_TT, bat_priv, |
371 | "Local tt entry (%pM) pending to be removed: %s\n", | |
372 | tt_local_entry->common.addr, message); | |
c6c8fea2 SE |
373 | } |
374 | ||
a73105b8 | 375 | void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr, |
cc47f66e | 376 | const char *message, bool roaming) |
c6c8fea2 | 377 | { |
7683fdc1 | 378 | struct tt_local_entry *tt_local_entry = NULL; |
c6c8fea2 | 379 | |
2dafb49d | 380 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
381 | if (!tt_local_entry) |
382 | goto out; | |
383 | ||
058d0e26 | 384 | tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL | |
c566dbbe | 385 | (roaming ? TT_CLIENT_ROAM : NO_FLAGS), message); |
7683fdc1 AQ |
386 | out: |
387 | if (tt_local_entry) | |
388 | tt_local_entry_free_ref(tt_local_entry); | |
c6c8fea2 SE |
389 | } |
390 | ||
a73105b8 | 391 | static void tt_local_purge(struct bat_priv *bat_priv) |
c6c8fea2 | 392 | { |
2dafb49d AQ |
393 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
394 | struct tt_local_entry *tt_local_entry; | |
48100bac | 395 | struct tt_common_entry *tt_common_entry; |
7aadf889 | 396 | struct hlist_node *node, *node_tmp; |
c6c8fea2 | 397 | struct hlist_head *head; |
7683fdc1 | 398 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 399 | uint32_t i; |
c6c8fea2 | 400 | |
c6c8fea2 SE |
401 | for (i = 0; i < hash->size; i++) { |
402 | head = &hash->table[i]; | |
7683fdc1 | 403 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 404 | |
7683fdc1 | 405 | spin_lock_bh(list_lock); |
48100bac | 406 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
7aadf889 | 407 | head, hash_entry) { |
48100bac AQ |
408 | tt_local_entry = container_of(tt_common_entry, |
409 | struct tt_local_entry, | |
410 | common); | |
411 | if (tt_local_entry->common.flags & TT_CLIENT_NOPURGE) | |
7aadf889 | 412 | continue; |
c6c8fea2 | 413 | |
058d0e26 | 414 | /* entry already marked for deletion */ |
48100bac | 415 | if (tt_local_entry->common.flags & TT_CLIENT_PENDING) |
058d0e26 AQ |
416 | continue; |
417 | ||
a04ccd59 | 418 | if (!has_timed_out(tt_local_entry->last_seen, |
032b7969 | 419 | TT_LOCAL_TIMEOUT)) |
7aadf889 ML |
420 | continue; |
421 | ||
058d0e26 | 422 | tt_local_set_pending(bat_priv, tt_local_entry, |
c566dbbe | 423 | TT_CLIENT_DEL, "timed out"); |
c6c8fea2 | 424 | } |
7683fdc1 | 425 | spin_unlock_bh(list_lock); |
c6c8fea2 SE |
426 | } |
427 | ||
c6c8fea2 SE |
428 | } |
429 | ||
a73105b8 | 430 | static void tt_local_table_free(struct bat_priv *bat_priv) |
c6c8fea2 | 431 | { |
a73105b8 | 432 | struct hashtable_t *hash; |
a73105b8 | 433 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
48100bac | 434 | struct tt_common_entry *tt_common_entry; |
a73105b8 | 435 | struct tt_local_entry *tt_local_entry; |
7683fdc1 AQ |
436 | struct hlist_node *node, *node_tmp; |
437 | struct hlist_head *head; | |
c90681b8 | 438 | uint32_t i; |
a73105b8 | 439 | |
2dafb49d | 440 | if (!bat_priv->tt_local_hash) |
c6c8fea2 SE |
441 | return; |
442 | ||
a73105b8 AQ |
443 | hash = bat_priv->tt_local_hash; |
444 | ||
445 | for (i = 0; i < hash->size; i++) { | |
446 | head = &hash->table[i]; | |
447 | list_lock = &hash->list_locks[i]; | |
448 | ||
449 | spin_lock_bh(list_lock); | |
48100bac | 450 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
a73105b8 AQ |
451 | head, hash_entry) { |
452 | hlist_del_rcu(node); | |
48100bac AQ |
453 | tt_local_entry = container_of(tt_common_entry, |
454 | struct tt_local_entry, | |
455 | common); | |
7683fdc1 | 456 | tt_local_entry_free_ref(tt_local_entry); |
a73105b8 AQ |
457 | } |
458 | spin_unlock_bh(list_lock); | |
459 | } | |
460 | ||
461 | hash_destroy(hash); | |
462 | ||
2dafb49d | 463 | bat_priv->tt_local_hash = NULL; |
c6c8fea2 SE |
464 | } |
465 | ||
a73105b8 | 466 | static int tt_global_init(struct bat_priv *bat_priv) |
c6c8fea2 | 467 | { |
2dafb49d | 468 | if (bat_priv->tt_global_hash) |
c6c8fea2 SE |
469 | return 1; |
470 | ||
2dafb49d | 471 | bat_priv->tt_global_hash = hash_new(1024); |
c6c8fea2 | 472 | |
2dafb49d | 473 | if (!bat_priv->tt_global_hash) |
c6c8fea2 SE |
474 | return 0; |
475 | ||
476 | return 1; | |
477 | } | |
478 | ||
a73105b8 | 479 | static void tt_changes_list_free(struct bat_priv *bat_priv) |
c6c8fea2 | 480 | { |
a73105b8 | 481 | struct tt_change_node *entry, *safe; |
c6c8fea2 | 482 | |
a73105b8 | 483 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
c6c8fea2 | 484 | |
a73105b8 AQ |
485 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
486 | list) { | |
487 | list_del(&entry->list); | |
488 | kfree(entry); | |
489 | } | |
c6c8fea2 | 490 | |
a73105b8 AQ |
491 | atomic_set(&bat_priv->tt_local_changes, 0); |
492 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); | |
493 | } | |
c6c8fea2 | 494 | |
a73105b8 AQ |
495 | /* caller must hold orig_node refcount */ |
496 | int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
bc279080 AQ |
497 | const unsigned char *tt_addr, uint8_t ttvn, bool roaming, |
498 | bool wifi) | |
a73105b8 AQ |
499 | { |
500 | struct tt_global_entry *tt_global_entry; | |
a73105b8 | 501 | struct orig_node *orig_node_tmp; |
7683fdc1 | 502 | int ret = 0; |
80b3f58c | 503 | int hash_added; |
c6c8fea2 | 504 | |
a73105b8 AQ |
505 | tt_global_entry = tt_global_hash_find(bat_priv, tt_addr); |
506 | ||
507 | if (!tt_global_entry) { | |
508 | tt_global_entry = | |
509 | kmalloc(sizeof(*tt_global_entry), | |
510 | GFP_ATOMIC); | |
511 | if (!tt_global_entry) | |
7683fdc1 AQ |
512 | goto out; |
513 | ||
48100bac AQ |
514 | memcpy(tt_global_entry->common.addr, tt_addr, ETH_ALEN); |
515 | tt_global_entry->common.flags = NO_FLAGS; | |
516 | atomic_set(&tt_global_entry->common.refcount, 2); | |
a73105b8 AQ |
517 | /* Assign the new orig_node */ |
518 | atomic_inc(&orig_node->refcount); | |
2dafb49d | 519 | tt_global_entry->orig_node = orig_node; |
a73105b8 | 520 | tt_global_entry->ttvn = ttvn; |
cc47f66e | 521 | tt_global_entry->roam_at = 0; |
7683fdc1 | 522 | |
80b3f58c SW |
523 | hash_added = hash_add(bat_priv->tt_global_hash, compare_tt, |
524 | choose_orig, &tt_global_entry->common, | |
525 | &tt_global_entry->common.hash_entry); | |
526 | ||
527 | if (unlikely(hash_added != 0)) { | |
528 | /* remove the reference for the hash */ | |
529 | tt_global_entry_free_ref(tt_global_entry); | |
530 | goto out_remove; | |
531 | } | |
7683fdc1 | 532 | atomic_inc(&orig_node->tt_size); |
a73105b8 AQ |
533 | } else { |
534 | if (tt_global_entry->orig_node != orig_node) { | |
535 | atomic_dec(&tt_global_entry->orig_node->tt_size); | |
536 | orig_node_tmp = tt_global_entry->orig_node; | |
537 | atomic_inc(&orig_node->refcount); | |
538 | tt_global_entry->orig_node = orig_node; | |
a73105b8 AQ |
539 | orig_node_free_ref(orig_node_tmp); |
540 | atomic_inc(&orig_node->tt_size); | |
541 | } | |
48100bac | 542 | tt_global_entry->common.flags = NO_FLAGS; |
cc47f66e | 543 | tt_global_entry->ttvn = ttvn; |
cc47f66e | 544 | tt_global_entry->roam_at = 0; |
a73105b8 | 545 | } |
c6c8fea2 | 546 | |
bc279080 | 547 | if (wifi) |
48100bac | 548 | tt_global_entry->common.flags |= TT_CLIENT_WIFI; |
bc279080 | 549 | |
a73105b8 AQ |
550 | bat_dbg(DBG_TT, bat_priv, |
551 | "Creating new global tt entry: %pM (via %pM)\n", | |
48100bac | 552 | tt_global_entry->common.addr, orig_node->orig); |
c6c8fea2 | 553 | |
80b3f58c | 554 | out_remove: |
a73105b8 | 555 | /* remove address from local hash if present */ |
48100bac | 556 | tt_local_remove(bat_priv, tt_global_entry->common.addr, |
7683fdc1 AQ |
557 | "global tt received", roaming); |
558 | ret = 1; | |
559 | out: | |
560 | if (tt_global_entry) | |
561 | tt_global_entry_free_ref(tt_global_entry); | |
562 | return ret; | |
c6c8fea2 SE |
563 | } |
564 | ||
2dafb49d | 565 | int tt_global_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
566 | { |
567 | struct net_device *net_dev = (struct net_device *)seq->private; | |
568 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
2dafb49d | 569 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
48100bac | 570 | struct tt_common_entry *tt_common_entry; |
2dafb49d | 571 | struct tt_global_entry *tt_global_entry; |
32ae9b22 | 572 | struct hard_iface *primary_if; |
7aadf889 | 573 | struct hlist_node *node; |
c6c8fea2 | 574 | struct hlist_head *head; |
c90681b8 AQ |
575 | uint32_t i; |
576 | int ret = 0; | |
32ae9b22 ML |
577 | |
578 | primary_if = primary_if_get_selected(bat_priv); | |
579 | if (!primary_if) { | |
86ceb360 SE |
580 | ret = seq_printf(seq, |
581 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
582 | net_dev->name); |
583 | goto out; | |
584 | } | |
c6c8fea2 | 585 | |
32ae9b22 | 586 | if (primary_if->if_status != IF_ACTIVE) { |
86ceb360 SE |
587 | ret = seq_printf(seq, |
588 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
589 | net_dev->name); |
590 | goto out; | |
c6c8fea2 SE |
591 | } |
592 | ||
2dafb49d AQ |
593 | seq_printf(seq, |
594 | "Globally announced TT entries received via the mesh %s\n", | |
c6c8fea2 | 595 | net_dev->name); |
df6edb9e AQ |
596 | seq_printf(seq, " %-13s %s %-15s %s %s\n", |
597 | "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags"); | |
c6c8fea2 | 598 | |
c6c8fea2 SE |
599 | for (i = 0; i < hash->size; i++) { |
600 | head = &hash->table[i]; | |
601 | ||
7aadf889 | 602 | rcu_read_lock(); |
48100bac | 603 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 604 | head, hash_entry) { |
48100bac AQ |
605 | tt_global_entry = container_of(tt_common_entry, |
606 | struct tt_global_entry, | |
607 | common); | |
86ceb360 SE |
608 | seq_printf(seq, |
609 | " * %pM (%3u) via %pM (%3u) [%c%c]\n", | |
610 | tt_global_entry->common.addr, | |
611 | tt_global_entry->ttvn, | |
612 | tt_global_entry->orig_node->orig, | |
613 | (uint8_t) atomic_read( | |
a73105b8 | 614 | &tt_global_entry->orig_node-> |
df6edb9e | 615 | last_ttvn), |
86ceb360 SE |
616 | (tt_global_entry->common.flags & |
617 | TT_CLIENT_ROAM ? 'R' : '.'), | |
618 | (tt_global_entry->common.flags & | |
619 | TT_CLIENT_WIFI ? 'W' : '.')); | |
c6c8fea2 | 620 | } |
7aadf889 | 621 | rcu_read_unlock(); |
c6c8fea2 | 622 | } |
32ae9b22 ML |
623 | out: |
624 | if (primary_if) | |
625 | hardif_free_ref(primary_if); | |
626 | return ret; | |
c6c8fea2 SE |
627 | } |
628 | ||
a73105b8 AQ |
629 | static void _tt_global_del(struct bat_priv *bat_priv, |
630 | struct tt_global_entry *tt_global_entry, | |
631 | const char *message) | |
c6c8fea2 | 632 | { |
a73105b8 | 633 | if (!tt_global_entry) |
7683fdc1 | 634 | goto out; |
a73105b8 AQ |
635 | |
636 | bat_dbg(DBG_TT, bat_priv, | |
2dafb49d | 637 | "Deleting global tt entry %pM (via %pM): %s\n", |
48100bac | 638 | tt_global_entry->common.addr, tt_global_entry->orig_node->orig, |
c6c8fea2 SE |
639 | message); |
640 | ||
a73105b8 | 641 | atomic_dec(&tt_global_entry->orig_node->tt_size); |
7683fdc1 | 642 | |
48100bac AQ |
643 | hash_remove(bat_priv->tt_global_hash, compare_tt, choose_orig, |
644 | tt_global_entry->common.addr); | |
7683fdc1 AQ |
645 | out: |
646 | if (tt_global_entry) | |
647 | tt_global_entry_free_ref(tt_global_entry); | |
c6c8fea2 SE |
648 | } |
649 | ||
de7aae65 SE |
650 | static void tt_global_del(struct bat_priv *bat_priv, |
651 | struct orig_node *orig_node, | |
652 | const unsigned char *addr, | |
653 | const char *message, bool roaming) | |
a73105b8 | 654 | { |
7683fdc1 | 655 | struct tt_global_entry *tt_global_entry = NULL; |
797399b4 | 656 | struct tt_local_entry *tt_local_entry = NULL; |
a73105b8 | 657 | |
a73105b8 | 658 | tt_global_entry = tt_global_hash_find(bat_priv, addr); |
92f90f56 | 659 | if (!tt_global_entry || tt_global_entry->orig_node != orig_node) |
7683fdc1 | 660 | goto out; |
a73105b8 | 661 | |
92f90f56 SE |
662 | if (!roaming) |
663 | goto out_del; | |
664 | ||
665 | /* if we are deleting a global entry due to a roam | |
666 | * event, there are two possibilities: | |
667 | * 1) the client roamed from node A to node B => we mark | |
668 | * it with TT_CLIENT_ROAM, we start a timer and we | |
669 | * wait for node B to claim it. In case of timeout | |
670 | * the entry is purged. | |
671 | * 2) the client roamed to us => we can directly delete | |
672 | * the global entry, since it is useless now. */ | |
673 | tt_local_entry = tt_local_hash_find(bat_priv, | |
674 | tt_global_entry->common.addr); | |
675 | if (!tt_local_entry) { | |
676 | tt_global_entry->common.flags |= TT_CLIENT_ROAM; | |
677 | tt_global_entry->roam_at = jiffies; | |
678 | goto out; | |
a73105b8 | 679 | } |
92f90f56 SE |
680 | |
681 | out_del: | |
682 | _tt_global_del(bat_priv, tt_global_entry, message); | |
683 | ||
cc47f66e | 684 | out: |
7683fdc1 AQ |
685 | if (tt_global_entry) |
686 | tt_global_entry_free_ref(tt_global_entry); | |
797399b4 AQ |
687 | if (tt_local_entry) |
688 | tt_local_entry_free_ref(tt_local_entry); | |
a73105b8 AQ |
689 | } |
690 | ||
2dafb49d | 691 | void tt_global_del_orig(struct bat_priv *bat_priv, |
a73105b8 | 692 | struct orig_node *orig_node, const char *message) |
c6c8fea2 | 693 | { |
2dafb49d | 694 | struct tt_global_entry *tt_global_entry; |
48100bac | 695 | struct tt_common_entry *tt_common_entry; |
c90681b8 | 696 | uint32_t i; |
a73105b8 AQ |
697 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
698 | struct hlist_node *node, *safe; | |
699 | struct hlist_head *head; | |
7683fdc1 | 700 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c6c8fea2 | 701 | |
6e801494 SW |
702 | if (!hash) |
703 | return; | |
704 | ||
a73105b8 AQ |
705 | for (i = 0; i < hash->size; i++) { |
706 | head = &hash->table[i]; | |
7683fdc1 | 707 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 708 | |
7683fdc1 | 709 | spin_lock_bh(list_lock); |
48100bac | 710 | hlist_for_each_entry_safe(tt_common_entry, node, safe, |
7c64fd98 | 711 | head, hash_entry) { |
48100bac AQ |
712 | tt_global_entry = container_of(tt_common_entry, |
713 | struct tt_global_entry, | |
714 | common); | |
7683fdc1 AQ |
715 | if (tt_global_entry->orig_node == orig_node) { |
716 | bat_dbg(DBG_TT, bat_priv, | |
86ceb360 | 717 | "Deleting global tt entry %pM (via %pM): %s\n", |
48100bac | 718 | tt_global_entry->common.addr, |
87944973 AQ |
719 | tt_global_entry->orig_node->orig, |
720 | message); | |
7683fdc1 AQ |
721 | hlist_del_rcu(node); |
722 | tt_global_entry_free_ref(tt_global_entry); | |
723 | } | |
a73105b8 | 724 | } |
7683fdc1 | 725 | spin_unlock_bh(list_lock); |
c6c8fea2 | 726 | } |
a73105b8 | 727 | atomic_set(&orig_node->tt_size, 0); |
17071578 | 728 | orig_node->tt_initialised = false; |
c6c8fea2 SE |
729 | } |
730 | ||
cc47f66e AQ |
731 | static void tt_global_roam_purge(struct bat_priv *bat_priv) |
732 | { | |
733 | struct hashtable_t *hash = bat_priv->tt_global_hash; | |
48100bac | 734 | struct tt_common_entry *tt_common_entry; |
cc47f66e AQ |
735 | struct tt_global_entry *tt_global_entry; |
736 | struct hlist_node *node, *node_tmp; | |
737 | struct hlist_head *head; | |
7683fdc1 | 738 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 739 | uint32_t i; |
cc47f66e | 740 | |
cc47f66e AQ |
741 | for (i = 0; i < hash->size; i++) { |
742 | head = &hash->table[i]; | |
7683fdc1 | 743 | list_lock = &hash->list_locks[i]; |
cc47f66e | 744 | |
7683fdc1 | 745 | spin_lock_bh(list_lock); |
48100bac | 746 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
cc47f66e | 747 | head, hash_entry) { |
48100bac AQ |
748 | tt_global_entry = container_of(tt_common_entry, |
749 | struct tt_global_entry, | |
750 | common); | |
751 | if (!(tt_global_entry->common.flags & TT_CLIENT_ROAM)) | |
cc47f66e | 752 | continue; |
a04ccd59 | 753 | if (!has_timed_out(tt_global_entry->roam_at, |
032b7969 | 754 | TT_CLIENT_ROAM_TIMEOUT)) |
cc47f66e AQ |
755 | continue; |
756 | ||
86ceb360 SE |
757 | bat_dbg(DBG_TT, bat_priv, |
758 | "Deleting global tt entry (%pM): Roaming timeout\n", | |
48100bac | 759 | tt_global_entry->common.addr); |
7683fdc1 AQ |
760 | atomic_dec(&tt_global_entry->orig_node->tt_size); |
761 | hlist_del_rcu(node); | |
762 | tt_global_entry_free_ref(tt_global_entry); | |
cc47f66e | 763 | } |
7683fdc1 | 764 | spin_unlock_bh(list_lock); |
cc47f66e AQ |
765 | } |
766 | ||
cc47f66e AQ |
767 | } |
768 | ||
a73105b8 | 769 | static void tt_global_table_free(struct bat_priv *bat_priv) |
c6c8fea2 | 770 | { |
7683fdc1 AQ |
771 | struct hashtable_t *hash; |
772 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
48100bac | 773 | struct tt_common_entry *tt_common_entry; |
7683fdc1 AQ |
774 | struct tt_global_entry *tt_global_entry; |
775 | struct hlist_node *node, *node_tmp; | |
776 | struct hlist_head *head; | |
c90681b8 | 777 | uint32_t i; |
7683fdc1 | 778 | |
2dafb49d | 779 | if (!bat_priv->tt_global_hash) |
c6c8fea2 SE |
780 | return; |
781 | ||
7683fdc1 AQ |
782 | hash = bat_priv->tt_global_hash; |
783 | ||
784 | for (i = 0; i < hash->size; i++) { | |
785 | head = &hash->table[i]; | |
786 | list_lock = &hash->list_locks[i]; | |
787 | ||
788 | spin_lock_bh(list_lock); | |
48100bac | 789 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
7683fdc1 AQ |
790 | head, hash_entry) { |
791 | hlist_del_rcu(node); | |
48100bac AQ |
792 | tt_global_entry = container_of(tt_common_entry, |
793 | struct tt_global_entry, | |
794 | common); | |
7683fdc1 AQ |
795 | tt_global_entry_free_ref(tt_global_entry); |
796 | } | |
797 | spin_unlock_bh(list_lock); | |
798 | } | |
799 | ||
800 | hash_destroy(hash); | |
801 | ||
2dafb49d | 802 | bat_priv->tt_global_hash = NULL; |
c6c8fea2 SE |
803 | } |
804 | ||
59b699cd AQ |
805 | static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry, |
806 | struct tt_global_entry *tt_global_entry) | |
807 | { | |
808 | bool ret = false; | |
809 | ||
48100bac AQ |
810 | if (tt_local_entry->common.flags & TT_CLIENT_WIFI && |
811 | tt_global_entry->common.flags & TT_CLIENT_WIFI) | |
59b699cd AQ |
812 | ret = true; |
813 | ||
814 | return ret; | |
815 | } | |
816 | ||
747e4221 | 817 | struct orig_node *transtable_search(struct bat_priv *bat_priv, |
3d393e47 | 818 | const uint8_t *src, const uint8_t *addr) |
c6c8fea2 | 819 | { |
3d393e47 AQ |
820 | struct tt_local_entry *tt_local_entry = NULL; |
821 | struct tt_global_entry *tt_global_entry = NULL; | |
7b36e8ee | 822 | struct orig_node *orig_node = NULL; |
c6c8fea2 | 823 | |
3d393e47 AQ |
824 | if (src && atomic_read(&bat_priv->ap_isolation)) { |
825 | tt_local_entry = tt_local_hash_find(bat_priv, src); | |
826 | if (!tt_local_entry) | |
827 | goto out; | |
828 | } | |
7aadf889 | 829 | |
3d393e47 | 830 | tt_global_entry = tt_global_hash_find(bat_priv, addr); |
2dafb49d | 831 | if (!tt_global_entry) |
7b36e8ee | 832 | goto out; |
7aadf889 | 833 | |
3d393e47 AQ |
834 | /* check whether the clients should not communicate due to AP |
835 | * isolation */ | |
836 | if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry)) | |
837 | goto out; | |
838 | ||
2dafb49d | 839 | if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount)) |
3d393e47 | 840 | goto out; |
c6c8fea2 | 841 | |
2dafb49d | 842 | orig_node = tt_global_entry->orig_node; |
c6c8fea2 | 843 | |
7b36e8ee | 844 | out: |
3d393e47 AQ |
845 | if (tt_global_entry) |
846 | tt_global_entry_free_ref(tt_global_entry); | |
847 | if (tt_local_entry) | |
848 | tt_local_entry_free_ref(tt_local_entry); | |
849 | ||
7b36e8ee | 850 | return orig_node; |
c6c8fea2 | 851 | } |
a73105b8 AQ |
852 | |
853 | /* Calculates the checksum of the local table of a given orig_node */ | |
de7aae65 SE |
854 | static uint16_t tt_global_crc(struct bat_priv *bat_priv, |
855 | struct orig_node *orig_node) | |
a73105b8 AQ |
856 | { |
857 | uint16_t total = 0, total_one; | |
858 | struct hashtable_t *hash = bat_priv->tt_global_hash; | |
48100bac | 859 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
860 | struct tt_global_entry *tt_global_entry; |
861 | struct hlist_node *node; | |
862 | struct hlist_head *head; | |
c90681b8 AQ |
863 | uint32_t i; |
864 | int j; | |
a73105b8 AQ |
865 | |
866 | for (i = 0; i < hash->size; i++) { | |
867 | head = &hash->table[i]; | |
868 | ||
869 | rcu_read_lock(); | |
48100bac | 870 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 | 871 | head, hash_entry) { |
48100bac AQ |
872 | tt_global_entry = container_of(tt_common_entry, |
873 | struct tt_global_entry, | |
874 | common); | |
a73105b8 AQ |
875 | if (compare_eth(tt_global_entry->orig_node, |
876 | orig_node)) { | |
cc47f66e AQ |
877 | /* Roaming clients are in the global table for |
878 | * consistency only. They don't have to be | |
879 | * taken into account while computing the | |
880 | * global crc */ | |
48100bac | 881 | if (tt_common_entry->flags & TT_CLIENT_ROAM) |
cc47f66e | 882 | continue; |
a73105b8 AQ |
883 | total_one = 0; |
884 | for (j = 0; j < ETH_ALEN; j++) | |
885 | total_one = crc16_byte(total_one, | |
48100bac | 886 | tt_common_entry->addr[j]); |
a73105b8 AQ |
887 | total ^= total_one; |
888 | } | |
889 | } | |
890 | rcu_read_unlock(); | |
891 | } | |
892 | ||
893 | return total; | |
894 | } | |
895 | ||
896 | /* Calculates the checksum of the local table */ | |
897 | uint16_t tt_local_crc(struct bat_priv *bat_priv) | |
898 | { | |
899 | uint16_t total = 0, total_one; | |
900 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
48100bac | 901 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
902 | struct hlist_node *node; |
903 | struct hlist_head *head; | |
c90681b8 AQ |
904 | uint32_t i; |
905 | int j; | |
a73105b8 AQ |
906 | |
907 | for (i = 0; i < hash->size; i++) { | |
908 | head = &hash->table[i]; | |
909 | ||
910 | rcu_read_lock(); | |
48100bac | 911 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 | 912 | head, hash_entry) { |
058d0e26 AQ |
913 | /* not yet committed clients have not to be taken into |
914 | * account while computing the CRC */ | |
48100bac | 915 | if (tt_common_entry->flags & TT_CLIENT_NEW) |
058d0e26 | 916 | continue; |
a73105b8 AQ |
917 | total_one = 0; |
918 | for (j = 0; j < ETH_ALEN; j++) | |
919 | total_one = crc16_byte(total_one, | |
48100bac | 920 | tt_common_entry->addr[j]); |
a73105b8 AQ |
921 | total ^= total_one; |
922 | } | |
a73105b8 AQ |
923 | rcu_read_unlock(); |
924 | } | |
925 | ||
926 | return total; | |
927 | } | |
928 | ||
929 | static void tt_req_list_free(struct bat_priv *bat_priv) | |
930 | { | |
931 | struct tt_req_node *node, *safe; | |
932 | ||
933 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
934 | ||
935 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
936 | list_del(&node->list); | |
937 | kfree(node); | |
938 | } | |
939 | ||
940 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
941 | } | |
942 | ||
de7aae65 SE |
943 | static void tt_save_orig_buffer(struct bat_priv *bat_priv, |
944 | struct orig_node *orig_node, | |
945 | const unsigned char *tt_buff, | |
946 | uint8_t tt_num_changes) | |
a73105b8 AQ |
947 | { |
948 | uint16_t tt_buff_len = tt_len(tt_num_changes); | |
949 | ||
950 | /* Replace the old buffer only if I received something in the | |
951 | * last OGM (the OGM could carry no changes) */ | |
952 | spin_lock_bh(&orig_node->tt_buff_lock); | |
953 | if (tt_buff_len > 0) { | |
954 | kfree(orig_node->tt_buff); | |
955 | orig_node->tt_buff_len = 0; | |
956 | orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); | |
957 | if (orig_node->tt_buff) { | |
958 | memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); | |
959 | orig_node->tt_buff_len = tt_buff_len; | |
960 | } | |
961 | } | |
962 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
963 | } | |
964 | ||
965 | static void tt_req_purge(struct bat_priv *bat_priv) | |
966 | { | |
967 | struct tt_req_node *node, *safe; | |
968 | ||
969 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
970 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
032b7969 | 971 | if (has_timed_out(node->issued_at, TT_REQUEST_TIMEOUT)) { |
a73105b8 AQ |
972 | list_del(&node->list); |
973 | kfree(node); | |
974 | } | |
975 | } | |
976 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
977 | } | |
978 | ||
979 | /* returns the pointer to the new tt_req_node struct if no request | |
980 | * has already been issued for this orig_node, NULL otherwise */ | |
981 | static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv, | |
982 | struct orig_node *orig_node) | |
983 | { | |
984 | struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; | |
985 | ||
986 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
987 | list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) { | |
988 | if (compare_eth(tt_req_node_tmp, orig_node) && | |
a04ccd59 | 989 | !has_timed_out(tt_req_node_tmp->issued_at, |
032b7969 | 990 | TT_REQUEST_TIMEOUT)) |
a73105b8 AQ |
991 | goto unlock; |
992 | } | |
993 | ||
994 | tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); | |
995 | if (!tt_req_node) | |
996 | goto unlock; | |
997 | ||
998 | memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); | |
999 | tt_req_node->issued_at = jiffies; | |
1000 | ||
1001 | list_add(&tt_req_node->list, &bat_priv->tt_req_list); | |
1002 | unlock: | |
1003 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1004 | return tt_req_node; | |
1005 | } | |
1006 | ||
058d0e26 AQ |
1007 | /* data_ptr is useless here, but has to be kept to respect the prototype */ |
1008 | static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr) | |
1009 | { | |
48100bac | 1010 | const struct tt_common_entry *tt_common_entry = entry_ptr; |
058d0e26 | 1011 | |
48100bac | 1012 | if (tt_common_entry->flags & TT_CLIENT_NEW) |
058d0e26 AQ |
1013 | return 0; |
1014 | return 1; | |
1015 | } | |
1016 | ||
a73105b8 AQ |
1017 | static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr) |
1018 | { | |
48100bac AQ |
1019 | const struct tt_common_entry *tt_common_entry = entry_ptr; |
1020 | const struct tt_global_entry *tt_global_entry; | |
a73105b8 AQ |
1021 | const struct orig_node *orig_node = data_ptr; |
1022 | ||
48100bac | 1023 | if (tt_common_entry->flags & TT_CLIENT_ROAM) |
cc47f66e AQ |
1024 | return 0; |
1025 | ||
48100bac AQ |
1026 | tt_global_entry = container_of(tt_common_entry, struct tt_global_entry, |
1027 | common); | |
1028 | ||
a73105b8 AQ |
1029 | return (tt_global_entry->orig_node == orig_node); |
1030 | } | |
1031 | ||
1032 | static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, | |
1033 | struct hashtable_t *hash, | |
1034 | struct hard_iface *primary_if, | |
1035 | int (*valid_cb)(const void *, | |
1036 | const void *), | |
1037 | void *cb_data) | |
1038 | { | |
48100bac | 1039 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
1040 | struct tt_query_packet *tt_response; |
1041 | struct tt_change *tt_change; | |
1042 | struct hlist_node *node; | |
1043 | struct hlist_head *head; | |
1044 | struct sk_buff *skb = NULL; | |
1045 | uint16_t tt_tot, tt_count; | |
1046 | ssize_t tt_query_size = sizeof(struct tt_query_packet); | |
c90681b8 | 1047 | uint32_t i; |
a73105b8 AQ |
1048 | |
1049 | if (tt_query_size + tt_len > primary_if->soft_iface->mtu) { | |
1050 | tt_len = primary_if->soft_iface->mtu - tt_query_size; | |
1051 | tt_len -= tt_len % sizeof(struct tt_change); | |
1052 | } | |
1053 | tt_tot = tt_len / sizeof(struct tt_change); | |
1054 | ||
1055 | skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN); | |
1056 | if (!skb) | |
1057 | goto out; | |
1058 | ||
1059 | skb_reserve(skb, ETH_HLEN); | |
1060 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1061 | tt_query_size + tt_len); | |
1062 | tt_response->ttvn = ttvn; | |
a73105b8 AQ |
1063 | |
1064 | tt_change = (struct tt_change *)(skb->data + tt_query_size); | |
1065 | tt_count = 0; | |
1066 | ||
1067 | rcu_read_lock(); | |
1068 | for (i = 0; i < hash->size; i++) { | |
1069 | head = &hash->table[i]; | |
1070 | ||
48100bac | 1071 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 AQ |
1072 | head, hash_entry) { |
1073 | if (tt_count == tt_tot) | |
1074 | break; | |
1075 | ||
48100bac | 1076 | if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data))) |
a73105b8 AQ |
1077 | continue; |
1078 | ||
48100bac AQ |
1079 | memcpy(tt_change->addr, tt_common_entry->addr, |
1080 | ETH_ALEN); | |
a73105b8 AQ |
1081 | tt_change->flags = NO_FLAGS; |
1082 | ||
1083 | tt_count++; | |
1084 | tt_change++; | |
1085 | } | |
1086 | } | |
1087 | rcu_read_unlock(); | |
1088 | ||
9d852393 AQ |
1089 | /* store in the message the number of entries we have successfully |
1090 | * copied */ | |
1091 | tt_response->tt_data = htons(tt_count); | |
1092 | ||
a73105b8 AQ |
1093 | out: |
1094 | return skb; | |
1095 | } | |
1096 | ||
a943cac1 ML |
1097 | static int send_tt_request(struct bat_priv *bat_priv, |
1098 | struct orig_node *dst_orig_node, | |
1099 | uint8_t ttvn, uint16_t tt_crc, bool full_table) | |
a73105b8 AQ |
1100 | { |
1101 | struct sk_buff *skb = NULL; | |
1102 | struct tt_query_packet *tt_request; | |
1103 | struct neigh_node *neigh_node = NULL; | |
1104 | struct hard_iface *primary_if; | |
1105 | struct tt_req_node *tt_req_node = NULL; | |
1106 | int ret = 1; | |
1107 | ||
1108 | primary_if = primary_if_get_selected(bat_priv); | |
1109 | if (!primary_if) | |
1110 | goto out; | |
1111 | ||
1112 | /* The new tt_req will be issued only if I'm not waiting for a | |
1113 | * reply from the same orig_node yet */ | |
1114 | tt_req_node = new_tt_req_node(bat_priv, dst_orig_node); | |
1115 | if (!tt_req_node) | |
1116 | goto out; | |
1117 | ||
1118 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN); | |
1119 | if (!skb) | |
1120 | goto out; | |
1121 | ||
1122 | skb_reserve(skb, ETH_HLEN); | |
1123 | ||
1124 | tt_request = (struct tt_query_packet *)skb_put(skb, | |
1125 | sizeof(struct tt_query_packet)); | |
1126 | ||
76543d14 SE |
1127 | tt_request->header.packet_type = BAT_TT_QUERY; |
1128 | tt_request->header.version = COMPAT_VERSION; | |
a73105b8 AQ |
1129 | memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1130 | memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN); | |
76543d14 | 1131 | tt_request->header.ttl = TTL; |
a73105b8 AQ |
1132 | tt_request->ttvn = ttvn; |
1133 | tt_request->tt_data = tt_crc; | |
1134 | tt_request->flags = TT_REQUEST; | |
1135 | ||
1136 | if (full_table) | |
1137 | tt_request->flags |= TT_FULL_TABLE; | |
1138 | ||
1139 | neigh_node = orig_node_get_router(dst_orig_node); | |
1140 | if (!neigh_node) | |
1141 | goto out; | |
1142 | ||
86ceb360 SE |
1143 | bat_dbg(DBG_TT, bat_priv, |
1144 | "Sending TT_REQUEST to %pM via %pM [%c]\n", | |
1145 | dst_orig_node->orig, neigh_node->addr, | |
a73105b8 AQ |
1146 | (full_table ? 'F' : '.')); |
1147 | ||
1148 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1149 | ret = 0; | |
1150 | ||
1151 | out: | |
1152 | if (neigh_node) | |
1153 | neigh_node_free_ref(neigh_node); | |
1154 | if (primary_if) | |
1155 | hardif_free_ref(primary_if); | |
1156 | if (ret) | |
1157 | kfree_skb(skb); | |
1158 | if (ret && tt_req_node) { | |
1159 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1160 | list_del(&tt_req_node->list); | |
1161 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1162 | kfree(tt_req_node); | |
1163 | } | |
1164 | return ret; | |
1165 | } | |
1166 | ||
1167 | static bool send_other_tt_response(struct bat_priv *bat_priv, | |
1168 | struct tt_query_packet *tt_request) | |
1169 | { | |
1170 | struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL; | |
1171 | struct neigh_node *neigh_node = NULL; | |
1172 | struct hard_iface *primary_if = NULL; | |
1173 | uint8_t orig_ttvn, req_ttvn, ttvn; | |
1174 | int ret = false; | |
1175 | unsigned char *tt_buff; | |
1176 | bool full_table; | |
1177 | uint16_t tt_len, tt_tot; | |
1178 | struct sk_buff *skb = NULL; | |
1179 | struct tt_query_packet *tt_response; | |
1180 | ||
1181 | bat_dbg(DBG_TT, bat_priv, | |
86ceb360 SE |
1182 | "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", |
1183 | tt_request->src, tt_request->ttvn, tt_request->dst, | |
a73105b8 AQ |
1184 | (tt_request->flags & TT_FULL_TABLE ? 'F' : '.')); |
1185 | ||
1186 | /* Let's get the orig node of the REAL destination */ | |
eb7e2a1e | 1187 | req_dst_orig_node = orig_hash_find(bat_priv, tt_request->dst); |
a73105b8 AQ |
1188 | if (!req_dst_orig_node) |
1189 | goto out; | |
1190 | ||
eb7e2a1e | 1191 | res_dst_orig_node = orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1192 | if (!res_dst_orig_node) |
1193 | goto out; | |
1194 | ||
1195 | neigh_node = orig_node_get_router(res_dst_orig_node); | |
1196 | if (!neigh_node) | |
1197 | goto out; | |
1198 | ||
1199 | primary_if = primary_if_get_selected(bat_priv); | |
1200 | if (!primary_if) | |
1201 | goto out; | |
1202 | ||
1203 | orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1204 | req_ttvn = tt_request->ttvn; | |
1205 | ||
015758d0 | 1206 | /* I don't have the requested data */ |
a73105b8 AQ |
1207 | if (orig_ttvn != req_ttvn || |
1208 | tt_request->tt_data != req_dst_orig_node->tt_crc) | |
1209 | goto out; | |
1210 | ||
015758d0 | 1211 | /* If the full table has been explicitly requested */ |
a73105b8 AQ |
1212 | if (tt_request->flags & TT_FULL_TABLE || |
1213 | !req_dst_orig_node->tt_buff) | |
1214 | full_table = true; | |
1215 | else | |
1216 | full_table = false; | |
1217 | ||
1218 | /* In this version, fragmentation is not implemented, then | |
1219 | * I'll send only one packet with as much TT entries as I can */ | |
1220 | if (!full_table) { | |
1221 | spin_lock_bh(&req_dst_orig_node->tt_buff_lock); | |
1222 | tt_len = req_dst_orig_node->tt_buff_len; | |
1223 | tt_tot = tt_len / sizeof(struct tt_change); | |
1224 | ||
1225 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + | |
1226 | tt_len + ETH_HLEN); | |
1227 | if (!skb) | |
1228 | goto unlock; | |
1229 | ||
1230 | skb_reserve(skb, ETH_HLEN); | |
1231 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1232 | sizeof(struct tt_query_packet) + tt_len); | |
1233 | tt_response->ttvn = req_ttvn; | |
1234 | tt_response->tt_data = htons(tt_tot); | |
1235 | ||
1236 | tt_buff = skb->data + sizeof(struct tt_query_packet); | |
1237 | /* Copy the last orig_node's OGM buffer */ | |
1238 | memcpy(tt_buff, req_dst_orig_node->tt_buff, | |
1239 | req_dst_orig_node->tt_buff_len); | |
1240 | ||
1241 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1242 | } else { | |
1243 | tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) * | |
1244 | sizeof(struct tt_change); | |
1245 | ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1246 | ||
1247 | skb = tt_response_fill_table(tt_len, ttvn, | |
1248 | bat_priv->tt_global_hash, | |
1249 | primary_if, tt_global_valid_entry, | |
1250 | req_dst_orig_node); | |
1251 | if (!skb) | |
1252 | goto out; | |
1253 | ||
1254 | tt_response = (struct tt_query_packet *)skb->data; | |
1255 | } | |
1256 | ||
76543d14 SE |
1257 | tt_response->header.packet_type = BAT_TT_QUERY; |
1258 | tt_response->header.version = COMPAT_VERSION; | |
1259 | tt_response->header.ttl = TTL; | |
a73105b8 AQ |
1260 | memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN); |
1261 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
1262 | tt_response->flags = TT_RESPONSE; | |
1263 | ||
1264 | if (full_table) | |
1265 | tt_response->flags |= TT_FULL_TABLE; | |
1266 | ||
1267 | bat_dbg(DBG_TT, bat_priv, | |
1268 | "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n", | |
1269 | res_dst_orig_node->orig, neigh_node->addr, | |
1270 | req_dst_orig_node->orig, req_ttvn); | |
1271 | ||
1272 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1273 | ret = true; | |
1274 | goto out; | |
1275 | ||
1276 | unlock: | |
1277 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1278 | ||
1279 | out: | |
1280 | if (res_dst_orig_node) | |
1281 | orig_node_free_ref(res_dst_orig_node); | |
1282 | if (req_dst_orig_node) | |
1283 | orig_node_free_ref(req_dst_orig_node); | |
1284 | if (neigh_node) | |
1285 | neigh_node_free_ref(neigh_node); | |
1286 | if (primary_if) | |
1287 | hardif_free_ref(primary_if); | |
1288 | if (!ret) | |
1289 | kfree_skb(skb); | |
1290 | return ret; | |
1291 | ||
1292 | } | |
1293 | static bool send_my_tt_response(struct bat_priv *bat_priv, | |
1294 | struct tt_query_packet *tt_request) | |
1295 | { | |
1296 | struct orig_node *orig_node = NULL; | |
1297 | struct neigh_node *neigh_node = NULL; | |
1298 | struct hard_iface *primary_if = NULL; | |
1299 | uint8_t my_ttvn, req_ttvn, ttvn; | |
1300 | int ret = false; | |
1301 | unsigned char *tt_buff; | |
1302 | bool full_table; | |
1303 | uint16_t tt_len, tt_tot; | |
1304 | struct sk_buff *skb = NULL; | |
1305 | struct tt_query_packet *tt_response; | |
1306 | ||
1307 | bat_dbg(DBG_TT, bat_priv, | |
86ceb360 SE |
1308 | "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", |
1309 | tt_request->src, tt_request->ttvn, | |
a73105b8 AQ |
1310 | (tt_request->flags & TT_FULL_TABLE ? 'F' : '.')); |
1311 | ||
1312 | ||
1313 | my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1314 | req_ttvn = tt_request->ttvn; | |
1315 | ||
eb7e2a1e | 1316 | orig_node = orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1317 | if (!orig_node) |
1318 | goto out; | |
1319 | ||
1320 | neigh_node = orig_node_get_router(orig_node); | |
1321 | if (!neigh_node) | |
1322 | goto out; | |
1323 | ||
1324 | primary_if = primary_if_get_selected(bat_priv); | |
1325 | if (!primary_if) | |
1326 | goto out; | |
1327 | ||
1328 | /* If the full table has been explicitly requested or the gap | |
1329 | * is too big send the whole local translation table */ | |
1330 | if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn || | |
1331 | !bat_priv->tt_buff) | |
1332 | full_table = true; | |
1333 | else | |
1334 | full_table = false; | |
1335 | ||
1336 | /* In this version, fragmentation is not implemented, then | |
1337 | * I'll send only one packet with as much TT entries as I can */ | |
1338 | if (!full_table) { | |
1339 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
1340 | tt_len = bat_priv->tt_buff_len; | |
1341 | tt_tot = tt_len / sizeof(struct tt_change); | |
1342 | ||
1343 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + | |
1344 | tt_len + ETH_HLEN); | |
1345 | if (!skb) | |
1346 | goto unlock; | |
1347 | ||
1348 | skb_reserve(skb, ETH_HLEN); | |
1349 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1350 | sizeof(struct tt_query_packet) + tt_len); | |
1351 | tt_response->ttvn = req_ttvn; | |
1352 | tt_response->tt_data = htons(tt_tot); | |
1353 | ||
1354 | tt_buff = skb->data + sizeof(struct tt_query_packet); | |
1355 | memcpy(tt_buff, bat_priv->tt_buff, | |
1356 | bat_priv->tt_buff_len); | |
1357 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1358 | } else { | |
1359 | tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) * | |
1360 | sizeof(struct tt_change); | |
1361 | ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1362 | ||
1363 | skb = tt_response_fill_table(tt_len, ttvn, | |
1364 | bat_priv->tt_local_hash, | |
058d0e26 AQ |
1365 | primary_if, tt_local_valid_entry, |
1366 | NULL); | |
a73105b8 AQ |
1367 | if (!skb) |
1368 | goto out; | |
1369 | ||
1370 | tt_response = (struct tt_query_packet *)skb->data; | |
1371 | } | |
1372 | ||
76543d14 SE |
1373 | tt_response->header.packet_type = BAT_TT_QUERY; |
1374 | tt_response->header.version = COMPAT_VERSION; | |
1375 | tt_response->header.ttl = TTL; | |
a73105b8 AQ |
1376 | memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1377 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
1378 | tt_response->flags = TT_RESPONSE; | |
1379 | ||
1380 | if (full_table) | |
1381 | tt_response->flags |= TT_FULL_TABLE; | |
1382 | ||
1383 | bat_dbg(DBG_TT, bat_priv, | |
1384 | "Sending TT_RESPONSE to %pM via %pM [%c]\n", | |
1385 | orig_node->orig, neigh_node->addr, | |
1386 | (tt_response->flags & TT_FULL_TABLE ? 'F' : '.')); | |
1387 | ||
1388 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1389 | ret = true; | |
1390 | goto out; | |
1391 | ||
1392 | unlock: | |
1393 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1394 | out: | |
1395 | if (orig_node) | |
1396 | orig_node_free_ref(orig_node); | |
1397 | if (neigh_node) | |
1398 | neigh_node_free_ref(neigh_node); | |
1399 | if (primary_if) | |
1400 | hardif_free_ref(primary_if); | |
1401 | if (!ret) | |
1402 | kfree_skb(skb); | |
1403 | /* This packet was for me, so it doesn't need to be re-routed */ | |
1404 | return true; | |
1405 | } | |
1406 | ||
1407 | bool send_tt_response(struct bat_priv *bat_priv, | |
1408 | struct tt_query_packet *tt_request) | |
1409 | { | |
1410 | if (is_my_mac(tt_request->dst)) | |
1411 | return send_my_tt_response(bat_priv, tt_request); | |
1412 | else | |
1413 | return send_other_tt_response(bat_priv, tt_request); | |
1414 | } | |
1415 | ||
1416 | static void _tt_update_changes(struct bat_priv *bat_priv, | |
1417 | struct orig_node *orig_node, | |
1418 | struct tt_change *tt_change, | |
1419 | uint16_t tt_num_changes, uint8_t ttvn) | |
1420 | { | |
1421 | int i; | |
1422 | ||
1423 | for (i = 0; i < tt_num_changes; i++) { | |
5fbc1598 | 1424 | if ((tt_change + i)->flags & TT_CLIENT_DEL) |
a73105b8 AQ |
1425 | tt_global_del(bat_priv, orig_node, |
1426 | (tt_change + i)->addr, | |
cc47f66e AQ |
1427 | "tt removed by changes", |
1428 | (tt_change + i)->flags & TT_CLIENT_ROAM); | |
a73105b8 AQ |
1429 | else |
1430 | if (!tt_global_add(bat_priv, orig_node, | |
bc279080 AQ |
1431 | (tt_change + i)->addr, ttvn, false, |
1432 | (tt_change + i)->flags & | |
1433 | TT_CLIENT_WIFI)) | |
a73105b8 AQ |
1434 | /* In case of problem while storing a |
1435 | * global_entry, we stop the updating | |
1436 | * procedure without committing the | |
1437 | * ttvn change. This will avoid to send | |
1438 | * corrupted data on tt_request | |
1439 | */ | |
1440 | return; | |
1441 | } | |
17071578 | 1442 | orig_node->tt_initialised = true; |
a73105b8 AQ |
1443 | } |
1444 | ||
1445 | static void tt_fill_gtable(struct bat_priv *bat_priv, | |
1446 | struct tt_query_packet *tt_response) | |
1447 | { | |
1448 | struct orig_node *orig_node = NULL; | |
1449 | ||
1450 | orig_node = orig_hash_find(bat_priv, tt_response->src); | |
1451 | if (!orig_node) | |
1452 | goto out; | |
1453 | ||
1454 | /* Purge the old table first.. */ | |
1455 | tt_global_del_orig(bat_priv, orig_node, "Received full table"); | |
1456 | ||
1457 | _tt_update_changes(bat_priv, orig_node, | |
1458 | (struct tt_change *)(tt_response + 1), | |
1459 | tt_response->tt_data, tt_response->ttvn); | |
1460 | ||
1461 | spin_lock_bh(&orig_node->tt_buff_lock); | |
1462 | kfree(orig_node->tt_buff); | |
1463 | orig_node->tt_buff_len = 0; | |
1464 | orig_node->tt_buff = NULL; | |
1465 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1466 | ||
1467 | atomic_set(&orig_node->last_ttvn, tt_response->ttvn); | |
1468 | ||
1469 | out: | |
1470 | if (orig_node) | |
1471 | orig_node_free_ref(orig_node); | |
1472 | } | |
1473 | ||
a943cac1 ML |
1474 | static void tt_update_changes(struct bat_priv *bat_priv, |
1475 | struct orig_node *orig_node, | |
1476 | uint16_t tt_num_changes, uint8_t ttvn, | |
1477 | struct tt_change *tt_change) | |
a73105b8 AQ |
1478 | { |
1479 | _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes, | |
1480 | ttvn); | |
1481 | ||
1482 | tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change, | |
1483 | tt_num_changes); | |
1484 | atomic_set(&orig_node->last_ttvn, ttvn); | |
1485 | } | |
1486 | ||
1487 | bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr) | |
1488 | { | |
7683fdc1 AQ |
1489 | struct tt_local_entry *tt_local_entry = NULL; |
1490 | bool ret = false; | |
a73105b8 | 1491 | |
a73105b8 | 1492 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
1493 | if (!tt_local_entry) |
1494 | goto out; | |
058d0e26 AQ |
1495 | /* Check if the client has been logically deleted (but is kept for |
1496 | * consistency purpose) */ | |
48100bac | 1497 | if (tt_local_entry->common.flags & TT_CLIENT_PENDING) |
058d0e26 | 1498 | goto out; |
7683fdc1 AQ |
1499 | ret = true; |
1500 | out: | |
a73105b8 | 1501 | if (tt_local_entry) |
7683fdc1 AQ |
1502 | tt_local_entry_free_ref(tt_local_entry); |
1503 | return ret; | |
a73105b8 AQ |
1504 | } |
1505 | ||
1506 | void handle_tt_response(struct bat_priv *bat_priv, | |
1507 | struct tt_query_packet *tt_response) | |
1508 | { | |
1509 | struct tt_req_node *node, *safe; | |
1510 | struct orig_node *orig_node = NULL; | |
1511 | ||
86ceb360 SE |
1512 | bat_dbg(DBG_TT, bat_priv, |
1513 | "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", | |
1514 | tt_response->src, tt_response->ttvn, tt_response->tt_data, | |
a73105b8 AQ |
1515 | (tt_response->flags & TT_FULL_TABLE ? 'F' : '.')); |
1516 | ||
1517 | orig_node = orig_hash_find(bat_priv, tt_response->src); | |
1518 | if (!orig_node) | |
1519 | goto out; | |
1520 | ||
1521 | if (tt_response->flags & TT_FULL_TABLE) | |
1522 | tt_fill_gtable(bat_priv, tt_response); | |
1523 | else | |
1524 | tt_update_changes(bat_priv, orig_node, tt_response->tt_data, | |
1525 | tt_response->ttvn, | |
1526 | (struct tt_change *)(tt_response + 1)); | |
1527 | ||
1528 | /* Delete the tt_req_node from pending tt_requests list */ | |
1529 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1530 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
1531 | if (!compare_eth(node->addr, tt_response->src)) | |
1532 | continue; | |
1533 | list_del(&node->list); | |
1534 | kfree(node); | |
1535 | } | |
1536 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1537 | ||
1538 | /* Recalculate the CRC for this orig_node and store it */ | |
a73105b8 | 1539 | orig_node->tt_crc = tt_global_crc(bat_priv, orig_node); |
cc47f66e AQ |
1540 | /* Roaming phase is over: tables are in sync again. I can |
1541 | * unset the flag */ | |
1542 | orig_node->tt_poss_change = false; | |
a73105b8 AQ |
1543 | out: |
1544 | if (orig_node) | |
1545 | orig_node_free_ref(orig_node); | |
1546 | } | |
1547 | ||
1548 | int tt_init(struct bat_priv *bat_priv) | |
1549 | { | |
1550 | if (!tt_local_init(bat_priv)) | |
1551 | return 0; | |
1552 | ||
1553 | if (!tt_global_init(bat_priv)) | |
1554 | return 0; | |
1555 | ||
1556 | tt_start_timer(bat_priv); | |
1557 | ||
1558 | return 1; | |
1559 | } | |
1560 | ||
cc47f66e | 1561 | static void tt_roam_list_free(struct bat_priv *bat_priv) |
a73105b8 | 1562 | { |
cc47f66e | 1563 | struct tt_roam_node *node, *safe; |
a73105b8 | 1564 | |
cc47f66e | 1565 | spin_lock_bh(&bat_priv->tt_roam_list_lock); |
a73105b8 | 1566 | |
cc47f66e AQ |
1567 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { |
1568 | list_del(&node->list); | |
1569 | kfree(node); | |
1570 | } | |
1571 | ||
1572 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1573 | } | |
1574 | ||
1575 | static void tt_roam_purge(struct bat_priv *bat_priv) | |
1576 | { | |
1577 | struct tt_roam_node *node, *safe; | |
1578 | ||
1579 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1580 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { | |
032b7969 | 1581 | if (!has_timed_out(node->first_time, ROAMING_MAX_TIME)) |
cc47f66e AQ |
1582 | continue; |
1583 | ||
1584 | list_del(&node->list); | |
1585 | kfree(node); | |
1586 | } | |
1587 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1588 | } | |
1589 | ||
1590 | /* This function checks whether the client already reached the | |
1591 | * maximum number of possible roaming phases. In this case the ROAMING_ADV | |
1592 | * will not be sent. | |
1593 | * | |
1594 | * returns true if the ROAMING_ADV can be sent, false otherwise */ | |
1595 | static bool tt_check_roam_count(struct bat_priv *bat_priv, | |
1596 | uint8_t *client) | |
1597 | { | |
1598 | struct tt_roam_node *tt_roam_node; | |
1599 | bool ret = false; | |
1600 | ||
1601 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1602 | /* The new tt_req will be issued only if I'm not waiting for a | |
1603 | * reply from the same orig_node yet */ | |
1604 | list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) { | |
1605 | if (!compare_eth(tt_roam_node->addr, client)) | |
1606 | continue; | |
1607 | ||
032b7969 | 1608 | if (has_timed_out(tt_roam_node->first_time, ROAMING_MAX_TIME)) |
cc47f66e AQ |
1609 | continue; |
1610 | ||
1611 | if (!atomic_dec_not_zero(&tt_roam_node->counter)) | |
1612 | /* Sorry, you roamed too many times! */ | |
1613 | goto unlock; | |
1614 | ret = true; | |
1615 | break; | |
1616 | } | |
1617 | ||
1618 | if (!ret) { | |
1619 | tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); | |
1620 | if (!tt_roam_node) | |
1621 | goto unlock; | |
1622 | ||
1623 | tt_roam_node->first_time = jiffies; | |
1624 | atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1); | |
1625 | memcpy(tt_roam_node->addr, client, ETH_ALEN); | |
1626 | ||
1627 | list_add(&tt_roam_node->list, &bat_priv->tt_roam_list); | |
1628 | ret = true; | |
1629 | } | |
1630 | ||
1631 | unlock: | |
1632 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1633 | return ret; | |
1634 | } | |
1635 | ||
de7aae65 SE |
1636 | static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client, |
1637 | struct orig_node *orig_node) | |
cc47f66e AQ |
1638 | { |
1639 | struct neigh_node *neigh_node = NULL; | |
1640 | struct sk_buff *skb = NULL; | |
1641 | struct roam_adv_packet *roam_adv_packet; | |
1642 | int ret = 1; | |
1643 | struct hard_iface *primary_if; | |
1644 | ||
1645 | /* before going on we have to check whether the client has | |
1646 | * already roamed to us too many times */ | |
1647 | if (!tt_check_roam_count(bat_priv, client)) | |
1648 | goto out; | |
1649 | ||
1650 | skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN); | |
1651 | if (!skb) | |
1652 | goto out; | |
1653 | ||
1654 | skb_reserve(skb, ETH_HLEN); | |
1655 | ||
1656 | roam_adv_packet = (struct roam_adv_packet *)skb_put(skb, | |
1657 | sizeof(struct roam_adv_packet)); | |
1658 | ||
76543d14 SE |
1659 | roam_adv_packet->header.packet_type = BAT_ROAM_ADV; |
1660 | roam_adv_packet->header.version = COMPAT_VERSION; | |
1661 | roam_adv_packet->header.ttl = TTL; | |
cc47f66e AQ |
1662 | primary_if = primary_if_get_selected(bat_priv); |
1663 | if (!primary_if) | |
1664 | goto out; | |
1665 | memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN); | |
1666 | hardif_free_ref(primary_if); | |
1667 | memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN); | |
1668 | memcpy(roam_adv_packet->client, client, ETH_ALEN); | |
1669 | ||
1670 | neigh_node = orig_node_get_router(orig_node); | |
1671 | if (!neigh_node) | |
1672 | goto out; | |
1673 | ||
1674 | bat_dbg(DBG_TT, bat_priv, | |
1675 | "Sending ROAMING_ADV to %pM (client %pM) via %pM\n", | |
1676 | orig_node->orig, client, neigh_node->addr); | |
1677 | ||
1678 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1679 | ret = 0; | |
1680 | ||
1681 | out: | |
1682 | if (neigh_node) | |
1683 | neigh_node_free_ref(neigh_node); | |
1684 | if (ret) | |
1685 | kfree_skb(skb); | |
1686 | return; | |
a73105b8 AQ |
1687 | } |
1688 | ||
1689 | static void tt_purge(struct work_struct *work) | |
1690 | { | |
1691 | struct delayed_work *delayed_work = | |
1692 | container_of(work, struct delayed_work, work); | |
1693 | struct bat_priv *bat_priv = | |
1694 | container_of(delayed_work, struct bat_priv, tt_work); | |
1695 | ||
1696 | tt_local_purge(bat_priv); | |
cc47f66e | 1697 | tt_global_roam_purge(bat_priv); |
a73105b8 | 1698 | tt_req_purge(bat_priv); |
cc47f66e | 1699 | tt_roam_purge(bat_priv); |
a73105b8 AQ |
1700 | |
1701 | tt_start_timer(bat_priv); | |
1702 | } | |
cc47f66e AQ |
1703 | |
1704 | void tt_free(struct bat_priv *bat_priv) | |
1705 | { | |
1706 | cancel_delayed_work_sync(&bat_priv->tt_work); | |
1707 | ||
1708 | tt_local_table_free(bat_priv); | |
1709 | tt_global_table_free(bat_priv); | |
1710 | tt_req_list_free(bat_priv); | |
1711 | tt_changes_list_free(bat_priv); | |
1712 | tt_roam_list_free(bat_priv); | |
1713 | ||
1714 | kfree(bat_priv->tt_buff); | |
1715 | } | |
058d0e26 | 1716 | |
697f2531 AQ |
1717 | /* This function will enable or disable the specified flags for all the entries |
1718 | * in the given hash table and returns the number of modified entries */ | |
1719 | static uint16_t tt_set_flags(struct hashtable_t *hash, uint16_t flags, | |
1720 | bool enable) | |
058d0e26 | 1721 | { |
c90681b8 | 1722 | uint32_t i; |
697f2531 | 1723 | uint16_t changed_num = 0; |
058d0e26 AQ |
1724 | struct hlist_head *head; |
1725 | struct hlist_node *node; | |
48100bac | 1726 | struct tt_common_entry *tt_common_entry; |
058d0e26 AQ |
1727 | |
1728 | if (!hash) | |
697f2531 | 1729 | goto out; |
058d0e26 AQ |
1730 | |
1731 | for (i = 0; i < hash->size; i++) { | |
1732 | head = &hash->table[i]; | |
1733 | ||
1734 | rcu_read_lock(); | |
48100bac | 1735 | hlist_for_each_entry_rcu(tt_common_entry, node, |
058d0e26 | 1736 | head, hash_entry) { |
697f2531 AQ |
1737 | if (enable) { |
1738 | if ((tt_common_entry->flags & flags) == flags) | |
1739 | continue; | |
1740 | tt_common_entry->flags |= flags; | |
1741 | } else { | |
1742 | if (!(tt_common_entry->flags & flags)) | |
1743 | continue; | |
1744 | tt_common_entry->flags &= ~flags; | |
1745 | } | |
1746 | changed_num++; | |
058d0e26 AQ |
1747 | } |
1748 | rcu_read_unlock(); | |
1749 | } | |
697f2531 AQ |
1750 | out: |
1751 | return changed_num; | |
058d0e26 AQ |
1752 | } |
1753 | ||
1754 | /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */ | |
1755 | static void tt_local_purge_pending_clients(struct bat_priv *bat_priv) | |
1756 | { | |
1757 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
48100bac | 1758 | struct tt_common_entry *tt_common_entry; |
058d0e26 AQ |
1759 | struct tt_local_entry *tt_local_entry; |
1760 | struct hlist_node *node, *node_tmp; | |
1761 | struct hlist_head *head; | |
1762 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
c90681b8 | 1763 | uint32_t i; |
058d0e26 AQ |
1764 | |
1765 | if (!hash) | |
1766 | return; | |
1767 | ||
1768 | for (i = 0; i < hash->size; i++) { | |
1769 | head = &hash->table[i]; | |
1770 | list_lock = &hash->list_locks[i]; | |
1771 | ||
1772 | spin_lock_bh(list_lock); | |
48100bac | 1773 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
058d0e26 | 1774 | head, hash_entry) { |
48100bac | 1775 | if (!(tt_common_entry->flags & TT_CLIENT_PENDING)) |
058d0e26 AQ |
1776 | continue; |
1777 | ||
86ceb360 SE |
1778 | bat_dbg(DBG_TT, bat_priv, |
1779 | "Deleting local tt entry (%pM): pending\n", | |
1780 | tt_common_entry->addr); | |
058d0e26 AQ |
1781 | |
1782 | atomic_dec(&bat_priv->num_local_tt); | |
1783 | hlist_del_rcu(node); | |
48100bac AQ |
1784 | tt_local_entry = container_of(tt_common_entry, |
1785 | struct tt_local_entry, | |
1786 | common); | |
058d0e26 AQ |
1787 | tt_local_entry_free_ref(tt_local_entry); |
1788 | } | |
1789 | spin_unlock_bh(list_lock); | |
1790 | } | |
1791 | ||
1792 | } | |
1793 | ||
1794 | void tt_commit_changes(struct bat_priv *bat_priv) | |
1795 | { | |
697f2531 AQ |
1796 | uint16_t changed_num = tt_set_flags(bat_priv->tt_local_hash, |
1797 | TT_CLIENT_NEW, false); | |
1798 | /* all the reset entries have now to be effectively counted as local | |
1799 | * entries */ | |
1800 | atomic_add(changed_num, &bat_priv->num_local_tt); | |
058d0e26 AQ |
1801 | tt_local_purge_pending_clients(bat_priv); |
1802 | ||
1803 | /* Increment the TTVN only once per OGM interval */ | |
1804 | atomic_inc(&bat_priv->ttvn); | |
1805 | bat_priv->tt_poss_change = false; | |
1806 | } | |
59b699cd AQ |
1807 | |
1808 | bool is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, uint8_t *dst) | |
1809 | { | |
1810 | struct tt_local_entry *tt_local_entry = NULL; | |
1811 | struct tt_global_entry *tt_global_entry = NULL; | |
1812 | bool ret = true; | |
1813 | ||
1814 | if (!atomic_read(&bat_priv->ap_isolation)) | |
1815 | return false; | |
1816 | ||
1817 | tt_local_entry = tt_local_hash_find(bat_priv, dst); | |
1818 | if (!tt_local_entry) | |
1819 | goto out; | |
1820 | ||
1821 | tt_global_entry = tt_global_hash_find(bat_priv, src); | |
1822 | if (!tt_global_entry) | |
1823 | goto out; | |
1824 | ||
1825 | if (_is_ap_isolated(tt_local_entry, tt_global_entry)) | |
1826 | goto out; | |
1827 | ||
1828 | ret = false; | |
1829 | ||
1830 | out: | |
1831 | if (tt_global_entry) | |
1832 | tt_global_entry_free_ref(tt_global_entry); | |
1833 | if (tt_local_entry) | |
1834 | tt_local_entry_free_ref(tt_local_entry); | |
1835 | return ret; | |
1836 | } | |
a943cac1 ML |
1837 | |
1838 | void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
1839 | const unsigned char *tt_buff, uint8_t tt_num_changes, | |
1840 | uint8_t ttvn, uint16_t tt_crc) | |
1841 | { | |
1842 | uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
1843 | bool full_table = true; | |
1844 | ||
17071578 AQ |
1845 | /* orig table not initialised AND first diff is in the OGM OR the ttvn |
1846 | * increased by one -> we can apply the attached changes */ | |
1847 | if ((!orig_node->tt_initialised && ttvn == 1) || | |
1848 | ttvn - orig_ttvn == 1) { | |
a943cac1 ML |
1849 | /* the OGM could not contain the changes due to their size or |
1850 | * because they have already been sent TT_OGM_APPEND_MAX times. | |
1851 | * In this case send a tt request */ | |
1852 | if (!tt_num_changes) { | |
1853 | full_table = false; | |
1854 | goto request_table; | |
1855 | } | |
1856 | ||
1857 | tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn, | |
1858 | (struct tt_change *)tt_buff); | |
1859 | ||
1860 | /* Even if we received the precomputed crc with the OGM, we | |
1861 | * prefer to recompute it to spot any possible inconsistency | |
1862 | * in the global table */ | |
1863 | orig_node->tt_crc = tt_global_crc(bat_priv, orig_node); | |
1864 | ||
1865 | /* The ttvn alone is not enough to guarantee consistency | |
1866 | * because a single value could represent different states | |
1867 | * (due to the wrap around). Thus a node has to check whether | |
1868 | * the resulting table (after applying the changes) is still | |
1869 | * consistent or not. E.g. a node could disconnect while its | |
1870 | * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case | |
1871 | * checking the CRC value is mandatory to detect the | |
1872 | * inconsistency */ | |
1873 | if (orig_node->tt_crc != tt_crc) | |
1874 | goto request_table; | |
1875 | ||
1876 | /* Roaming phase is over: tables are in sync again. I can | |
1877 | * unset the flag */ | |
1878 | orig_node->tt_poss_change = false; | |
1879 | } else { | |
1880 | /* if we missed more than one change or our tables are not | |
1881 | * in sync anymore -> request fresh tt data */ | |
17071578 AQ |
1882 | if (!orig_node->tt_initialised || ttvn != orig_ttvn || |
1883 | orig_node->tt_crc != tt_crc) { | |
a943cac1 | 1884 | request_table: |
86ceb360 SE |
1885 | bat_dbg(DBG_TT, bat_priv, |
1886 | "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n", | |
1887 | orig_node->orig, ttvn, orig_ttvn, tt_crc, | |
1888 | orig_node->tt_crc, tt_num_changes); | |
a943cac1 ML |
1889 | send_tt_request(bat_priv, orig_node, ttvn, tt_crc, |
1890 | full_table); | |
1891 | return; | |
1892 | } | |
1893 | } | |
1894 | } |