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