Commit | Line | Data |
---|---|---|
c6c8fea2 | 1 | /* |
567db7b0 | 2 | * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 | 3 | * |
35c133a0 | 4 | * Marek Lindner, Simon Wunderlich, Antonio Quartulli |
c6c8fea2 SE |
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" |
20ff9d59 | 30 | #include "bridge_loop_avoidance.h" |
c6c8fea2 | 31 | |
a73105b8 AQ |
32 | #include <linux/crc16.h> |
33 | ||
de7aae65 SE |
34 | static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client, |
35 | struct orig_node *orig_node); | |
a73105b8 | 36 | static void tt_purge(struct work_struct *work); |
db08e6e5 | 37 | static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry); |
c6c8fea2 | 38 | |
7aadf889 | 39 | /* returns 1 if they are the same mac addr */ |
48100bac | 40 | static int compare_tt(const struct hlist_node *node, const void *data2) |
7aadf889 | 41 | { |
48100bac | 42 | const void *data1 = container_of(node, struct tt_common_entry, |
747e4221 | 43 | hash_entry); |
7aadf889 ML |
44 | |
45 | return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); | |
46 | } | |
47 | ||
a73105b8 | 48 | static void tt_start_timer(struct bat_priv *bat_priv) |
c6c8fea2 | 49 | { |
a73105b8 AQ |
50 | INIT_DELAYED_WORK(&bat_priv->tt_work, tt_purge); |
51 | queue_delayed_work(bat_event_workqueue, &bat_priv->tt_work, | |
52 | msecs_to_jiffies(5000)); | |
c6c8fea2 SE |
53 | } |
54 | ||
48100bac AQ |
55 | static struct tt_common_entry *tt_hash_find(struct hashtable_t *hash, |
56 | const void *data) | |
7aadf889 | 57 | { |
7aadf889 ML |
58 | struct hlist_head *head; |
59 | struct hlist_node *node; | |
48100bac | 60 | struct tt_common_entry *tt_common_entry, *tt_common_entry_tmp = NULL; |
c90681b8 | 61 | uint32_t index; |
7aadf889 ML |
62 | |
63 | if (!hash) | |
64 | return NULL; | |
65 | ||
66 | index = choose_orig(data, hash->size); | |
67 | head = &hash->table[index]; | |
68 | ||
69 | rcu_read_lock(); | |
48100bac AQ |
70 | hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) { |
71 | if (!compare_eth(tt_common_entry, data)) | |
7aadf889 ML |
72 | continue; |
73 | ||
48100bac | 74 | if (!atomic_inc_not_zero(&tt_common_entry->refcount)) |
7683fdc1 AQ |
75 | continue; |
76 | ||
48100bac | 77 | tt_common_entry_tmp = tt_common_entry; |
7aadf889 ML |
78 | break; |
79 | } | |
80 | rcu_read_unlock(); | |
81 | ||
48100bac | 82 | return tt_common_entry_tmp; |
7aadf889 ML |
83 | } |
84 | ||
48100bac AQ |
85 | static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv, |
86 | const void *data) | |
7aadf889 | 87 | { |
48100bac AQ |
88 | struct tt_common_entry *tt_common_entry; |
89 | struct tt_local_entry *tt_local_entry = NULL; | |
7aadf889 | 90 | |
48100bac AQ |
91 | tt_common_entry = tt_hash_find(bat_priv->tt_local_hash, data); |
92 | if (tt_common_entry) | |
93 | tt_local_entry = container_of(tt_common_entry, | |
94 | struct tt_local_entry, common); | |
95 | return tt_local_entry; | |
96 | } | |
7aadf889 | 97 | |
48100bac AQ |
98 | static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv, |
99 | const void *data) | |
100 | { | |
101 | struct tt_common_entry *tt_common_entry; | |
102 | struct tt_global_entry *tt_global_entry = NULL; | |
7683fdc1 | 103 | |
48100bac AQ |
104 | tt_common_entry = tt_hash_find(bat_priv->tt_global_hash, data); |
105 | if (tt_common_entry) | |
106 | tt_global_entry = container_of(tt_common_entry, | |
107 | struct tt_global_entry, common); | |
108 | return tt_global_entry; | |
7aadf889 | 109 | |
7aadf889 ML |
110 | } |
111 | ||
7683fdc1 AQ |
112 | static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry) |
113 | { | |
48100bac AQ |
114 | if (atomic_dec_and_test(&tt_local_entry->common.refcount)) |
115 | kfree_rcu(tt_local_entry, common.rcu); | |
7683fdc1 AQ |
116 | } |
117 | ||
531027fc SW |
118 | static void tt_global_entry_free_rcu(struct rcu_head *rcu) |
119 | { | |
48100bac | 120 | struct tt_common_entry *tt_common_entry; |
531027fc SW |
121 | struct tt_global_entry *tt_global_entry; |
122 | ||
48100bac AQ |
123 | tt_common_entry = container_of(rcu, struct tt_common_entry, rcu); |
124 | tt_global_entry = container_of(tt_common_entry, struct tt_global_entry, | |
125 | common); | |
531027fc | 126 | |
531027fc SW |
127 | kfree(tt_global_entry); |
128 | } | |
129 | ||
7683fdc1 AQ |
130 | static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry) |
131 | { | |
db08e6e5 SW |
132 | if (atomic_dec_and_test(&tt_global_entry->common.refcount)) { |
133 | tt_global_del_orig_list(tt_global_entry); | |
48100bac AQ |
134 | call_rcu(&tt_global_entry->common.rcu, |
135 | tt_global_entry_free_rcu); | |
db08e6e5 SW |
136 | } |
137 | } | |
138 | ||
139 | static void tt_orig_list_entry_free_rcu(struct rcu_head *rcu) | |
140 | { | |
141 | struct tt_orig_list_entry *orig_entry; | |
142 | ||
143 | orig_entry = container_of(rcu, struct tt_orig_list_entry, rcu); | |
db08e6e5 SW |
144 | orig_node_free_ref(orig_entry->orig_node); |
145 | kfree(orig_entry); | |
146 | } | |
147 | ||
148 | static void tt_orig_list_entry_free_ref(struct tt_orig_list_entry *orig_entry) | |
149 | { | |
8b8e4bc0 AQ |
150 | /* to avoid race conditions, immediately decrease the tt counter */ |
151 | atomic_dec(&orig_entry->orig_node->tt_size); | |
db08e6e5 | 152 | call_rcu(&orig_entry->rcu, tt_orig_list_entry_free_rcu); |
7683fdc1 AQ |
153 | } |
154 | ||
ff66c975 AQ |
155 | static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr, |
156 | uint8_t flags) | |
a73105b8 AQ |
157 | { |
158 | struct tt_change_node *tt_change_node; | |
159 | ||
160 | tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC); | |
161 | ||
162 | if (!tt_change_node) | |
163 | return; | |
164 | ||
ff66c975 | 165 | tt_change_node->change.flags = flags; |
a73105b8 AQ |
166 | memcpy(tt_change_node->change.addr, addr, ETH_ALEN); |
167 | ||
168 | spin_lock_bh(&bat_priv->tt_changes_list_lock); | |
169 | /* track the change in the OGMinterval list */ | |
170 | list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list); | |
171 | atomic_inc(&bat_priv->tt_local_changes); | |
172 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); | |
173 | ||
174 | atomic_set(&bat_priv->tt_ogm_append_cnt, 0); | |
175 | } | |
176 | ||
177 | int tt_len(int changes_num) | |
178 | { | |
179 | return changes_num * sizeof(struct tt_change); | |
180 | } | |
181 | ||
182 | static int tt_local_init(struct bat_priv *bat_priv) | |
c6c8fea2 | 183 | { |
2dafb49d | 184 | if (bat_priv->tt_local_hash) |
c6c8fea2 SE |
185 | return 1; |
186 | ||
2dafb49d | 187 | bat_priv->tt_local_hash = hash_new(1024); |
c6c8fea2 | 188 | |
2dafb49d | 189 | if (!bat_priv->tt_local_hash) |
c6c8fea2 SE |
190 | return 0; |
191 | ||
c6c8fea2 SE |
192 | return 1; |
193 | } | |
194 | ||
bc279080 AQ |
195 | void tt_local_add(struct net_device *soft_iface, const uint8_t *addr, |
196 | int ifindex) | |
c6c8fea2 SE |
197 | { |
198 | struct bat_priv *bat_priv = netdev_priv(soft_iface); | |
7683fdc1 AQ |
199 | struct tt_local_entry *tt_local_entry = NULL; |
200 | struct tt_global_entry *tt_global_entry = NULL; | |
db08e6e5 SW |
201 | struct hlist_head *head; |
202 | struct hlist_node *node; | |
203 | struct tt_orig_list_entry *orig_entry; | |
80b3f58c | 204 | int hash_added; |
c6c8fea2 | 205 | |
2dafb49d | 206 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
c6c8fea2 | 207 | |
2dafb49d AQ |
208 | if (tt_local_entry) { |
209 | tt_local_entry->last_seen = jiffies; | |
521251f2 AQ |
210 | /* possibly unset the TT_CLIENT_PENDING flag */ |
211 | tt_local_entry->common.flags &= ~TT_CLIENT_PENDING; | |
7683fdc1 | 212 | goto out; |
c6c8fea2 SE |
213 | } |
214 | ||
704509b8 | 215 | tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC); |
2dafb49d | 216 | if (!tt_local_entry) |
7683fdc1 | 217 | goto out; |
a73105b8 | 218 | |
a73105b8 AQ |
219 | bat_dbg(DBG_TT, bat_priv, |
220 | "Creating new local tt entry: %pM (ttvn: %d)\n", addr, | |
221 | (uint8_t)atomic_read(&bat_priv->ttvn)); | |
c6c8fea2 | 222 | |
48100bac AQ |
223 | memcpy(tt_local_entry->common.addr, addr, ETH_ALEN); |
224 | tt_local_entry->common.flags = NO_FLAGS; | |
bc279080 | 225 | if (is_wifi_iface(ifindex)) |
48100bac AQ |
226 | tt_local_entry->common.flags |= TT_CLIENT_WIFI; |
227 | atomic_set(&tt_local_entry->common.refcount, 2); | |
228 | tt_local_entry->last_seen = jiffies; | |
c6c8fea2 SE |
229 | |
230 | /* the batman interface mac address should never be purged */ | |
39901e71 | 231 | if (compare_eth(addr, soft_iface->dev_addr)) |
48100bac | 232 | tt_local_entry->common.flags |= TT_CLIENT_NOPURGE; |
c6c8fea2 | 233 | |
c40ed2bf AQ |
234 | /* The local entry has to be marked as NEW to avoid to send it in |
235 | * a full table response going out before the next ttvn increment | |
236 | * (consistency check) */ | |
237 | tt_local_entry->common.flags |= TT_CLIENT_NEW; | |
238 | ||
80b3f58c SW |
239 | hash_added = hash_add(bat_priv->tt_local_hash, compare_tt, choose_orig, |
240 | &tt_local_entry->common, | |
241 | &tt_local_entry->common.hash_entry); | |
242 | ||
243 | if (unlikely(hash_added != 0)) { | |
244 | /* remove the reference for the hash */ | |
245 | tt_local_entry_free_ref(tt_local_entry); | |
246 | goto out; | |
247 | } | |
248 | ||
48100bac | 249 | tt_local_event(bat_priv, addr, tt_local_entry->common.flags); |
ff66c975 | 250 | |
c6c8fea2 | 251 | /* remove address from global hash if present */ |
2dafb49d | 252 | tt_global_entry = tt_global_hash_find(bat_priv, addr); |
c6c8fea2 | 253 | |
cc47f66e AQ |
254 | /* Check whether it is a roaming! */ |
255 | if (tt_global_entry) { | |
db08e6e5 SW |
256 | /* These node are probably going to update their tt table */ |
257 | head = &tt_global_entry->orig_list; | |
258 | rcu_read_lock(); | |
259 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
260 | orig_entry->orig_node->tt_poss_change = true; | |
261 | ||
262 | send_roam_adv(bat_priv, tt_global_entry->common.addr, | |
263 | orig_entry->orig_node); | |
264 | } | |
265 | rcu_read_unlock(); | |
266 | /* The global entry has to be marked as ROAMING and | |
267 | * has to be kept for consistency purpose | |
268 | */ | |
220b07e9 | 269 | tt_global_entry->common.flags |= TT_CLIENT_ROAM; |
03fc3070 | 270 | tt_global_entry->roam_at = jiffies; |
7683fdc1 AQ |
271 | } |
272 | out: | |
273 | if (tt_local_entry) | |
274 | tt_local_entry_free_ref(tt_local_entry); | |
275 | if (tt_global_entry) | |
276 | tt_global_entry_free_ref(tt_global_entry); | |
c6c8fea2 SE |
277 | } |
278 | ||
a73105b8 AQ |
279 | int tt_changes_fill_buffer(struct bat_priv *bat_priv, |
280 | unsigned char *buff, int buff_len) | |
c6c8fea2 | 281 | { |
a73105b8 AQ |
282 | int count = 0, tot_changes = 0; |
283 | struct tt_change_node *entry, *safe; | |
c6c8fea2 | 284 | |
a73105b8 AQ |
285 | if (buff_len > 0) |
286 | tot_changes = buff_len / tt_len(1); | |
c6c8fea2 | 287 | |
a73105b8 AQ |
288 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
289 | atomic_set(&bat_priv->tt_local_changes, 0); | |
c6c8fea2 | 290 | |
a73105b8 | 291 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
7c64fd98 | 292 | list) { |
a73105b8 AQ |
293 | if (count < tot_changes) { |
294 | memcpy(buff + tt_len(count), | |
295 | &entry->change, sizeof(struct tt_change)); | |
c6c8fea2 SE |
296 | count++; |
297 | } | |
a73105b8 AQ |
298 | list_del(&entry->list); |
299 | kfree(entry); | |
c6c8fea2 | 300 | } |
a73105b8 AQ |
301 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); |
302 | ||
303 | /* Keep the buffer for possible tt_request */ | |
304 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
305 | kfree(bat_priv->tt_buff); | |
306 | bat_priv->tt_buff_len = 0; | |
307 | bat_priv->tt_buff = NULL; | |
308 | /* We check whether this new OGM has no changes due to size | |
309 | * problems */ | |
310 | if (buff_len > 0) { | |
311 | /** | |
312 | * if kmalloc() fails we will reply with the full table | |
313 | * instead of providing the diff | |
314 | */ | |
315 | bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC); | |
316 | if (bat_priv->tt_buff) { | |
317 | memcpy(bat_priv->tt_buff, buff, buff_len); | |
318 | bat_priv->tt_buff_len = buff_len; | |
319 | } | |
320 | } | |
321 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
c6c8fea2 | 322 | |
a73105b8 | 323 | return tot_changes; |
c6c8fea2 SE |
324 | } |
325 | ||
2dafb49d | 326 | int tt_local_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
327 | { |
328 | struct net_device *net_dev = (struct net_device *)seq->private; | |
329 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
2dafb49d | 330 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
48100bac | 331 | struct tt_common_entry *tt_common_entry; |
32ae9b22 | 332 | struct hard_iface *primary_if; |
7aadf889 | 333 | struct hlist_node *node; |
c6c8fea2 | 334 | struct hlist_head *head; |
c90681b8 AQ |
335 | uint32_t i; |
336 | int ret = 0; | |
32ae9b22 ML |
337 | |
338 | primary_if = primary_if_get_selected(bat_priv); | |
339 | if (!primary_if) { | |
86ceb360 SE |
340 | ret = seq_printf(seq, |
341 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
342 | net_dev->name); |
343 | goto out; | |
344 | } | |
c6c8fea2 | 345 | |
32ae9b22 | 346 | if (primary_if->if_status != IF_ACTIVE) { |
86ceb360 SE |
347 | ret = seq_printf(seq, |
348 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
349 | net_dev->name); |
350 | goto out; | |
c6c8fea2 SE |
351 | } |
352 | ||
86ceb360 SE |
353 | seq_printf(seq, |
354 | "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n", | |
a73105b8 | 355 | net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn)); |
c6c8fea2 | 356 | |
c6c8fea2 SE |
357 | for (i = 0; i < hash->size; i++) { |
358 | head = &hash->table[i]; | |
359 | ||
7aadf889 | 360 | rcu_read_lock(); |
48100bac | 361 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 362 | head, hash_entry) { |
d099c2c5 | 363 | seq_printf(seq, " * %pM [%c%c%c%c%c]\n", |
7c64fd98 SE |
364 | tt_common_entry->addr, |
365 | (tt_common_entry->flags & | |
366 | TT_CLIENT_ROAM ? 'R' : '.'), | |
367 | (tt_common_entry->flags & | |
368 | TT_CLIENT_NOPURGE ? 'P' : '.'), | |
369 | (tt_common_entry->flags & | |
370 | TT_CLIENT_NEW ? 'N' : '.'), | |
371 | (tt_common_entry->flags & | |
372 | TT_CLIENT_PENDING ? 'X' : '.'), | |
373 | (tt_common_entry->flags & | |
374 | TT_CLIENT_WIFI ? 'W' : '.')); | |
c6c8fea2 | 375 | } |
7aadf889 | 376 | rcu_read_unlock(); |
c6c8fea2 | 377 | } |
32ae9b22 ML |
378 | out: |
379 | if (primary_if) | |
380 | hardif_free_ref(primary_if); | |
381 | return ret; | |
c6c8fea2 SE |
382 | } |
383 | ||
058d0e26 AQ |
384 | static void tt_local_set_pending(struct bat_priv *bat_priv, |
385 | struct tt_local_entry *tt_local_entry, | |
c566dbbe | 386 | uint16_t flags, const char *message) |
c6c8fea2 | 387 | { |
48100bac AQ |
388 | tt_local_event(bat_priv, tt_local_entry->common.addr, |
389 | tt_local_entry->common.flags | flags); | |
a73105b8 | 390 | |
015758d0 AQ |
391 | /* The local client has to be marked as "pending to be removed" but has |
392 | * to be kept in the table in order to send it in a full table | |
058d0e26 | 393 | * response issued before the net ttvn increment (consistency check) */ |
48100bac | 394 | tt_local_entry->common.flags |= TT_CLIENT_PENDING; |
c566dbbe | 395 | |
86ceb360 SE |
396 | bat_dbg(DBG_TT, bat_priv, |
397 | "Local tt entry (%pM) pending to be removed: %s\n", | |
398 | tt_local_entry->common.addr, message); | |
c6c8fea2 SE |
399 | } |
400 | ||
a73105b8 | 401 | void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr, |
cc47f66e | 402 | const char *message, bool roaming) |
c6c8fea2 | 403 | { |
7683fdc1 | 404 | struct tt_local_entry *tt_local_entry = NULL; |
c6c8fea2 | 405 | |
2dafb49d | 406 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
407 | if (!tt_local_entry) |
408 | goto out; | |
409 | ||
058d0e26 | 410 | tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL | |
c566dbbe | 411 | (roaming ? TT_CLIENT_ROAM : NO_FLAGS), message); |
7683fdc1 AQ |
412 | out: |
413 | if (tt_local_entry) | |
414 | tt_local_entry_free_ref(tt_local_entry); | |
c6c8fea2 SE |
415 | } |
416 | ||
a73105b8 | 417 | static void tt_local_purge(struct bat_priv *bat_priv) |
c6c8fea2 | 418 | { |
2dafb49d AQ |
419 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
420 | struct tt_local_entry *tt_local_entry; | |
48100bac | 421 | struct tt_common_entry *tt_common_entry; |
7aadf889 | 422 | struct hlist_node *node, *node_tmp; |
c6c8fea2 | 423 | struct hlist_head *head; |
7683fdc1 | 424 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 425 | uint32_t i; |
c6c8fea2 | 426 | |
c6c8fea2 SE |
427 | for (i = 0; i < hash->size; i++) { |
428 | head = &hash->table[i]; | |
7683fdc1 | 429 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 430 | |
7683fdc1 | 431 | spin_lock_bh(list_lock); |
48100bac | 432 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
7aadf889 | 433 | head, hash_entry) { |
48100bac AQ |
434 | tt_local_entry = container_of(tt_common_entry, |
435 | struct tt_local_entry, | |
436 | common); | |
437 | if (tt_local_entry->common.flags & TT_CLIENT_NOPURGE) | |
7aadf889 | 438 | continue; |
c6c8fea2 | 439 | |
058d0e26 | 440 | /* entry already marked for deletion */ |
48100bac | 441 | if (tt_local_entry->common.flags & TT_CLIENT_PENDING) |
058d0e26 AQ |
442 | continue; |
443 | ||
a04ccd59 | 444 | if (!has_timed_out(tt_local_entry->last_seen, |
032b7969 | 445 | TT_LOCAL_TIMEOUT)) |
7aadf889 ML |
446 | continue; |
447 | ||
058d0e26 | 448 | tt_local_set_pending(bat_priv, tt_local_entry, |
c566dbbe | 449 | TT_CLIENT_DEL, "timed out"); |
c6c8fea2 | 450 | } |
7683fdc1 | 451 | spin_unlock_bh(list_lock); |
c6c8fea2 SE |
452 | } |
453 | ||
c6c8fea2 SE |
454 | } |
455 | ||
a73105b8 | 456 | static void tt_local_table_free(struct bat_priv *bat_priv) |
c6c8fea2 | 457 | { |
a73105b8 | 458 | struct hashtable_t *hash; |
a73105b8 | 459 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
48100bac | 460 | struct tt_common_entry *tt_common_entry; |
a73105b8 | 461 | struct tt_local_entry *tt_local_entry; |
7683fdc1 AQ |
462 | struct hlist_node *node, *node_tmp; |
463 | struct hlist_head *head; | |
c90681b8 | 464 | uint32_t i; |
a73105b8 | 465 | |
2dafb49d | 466 | if (!bat_priv->tt_local_hash) |
c6c8fea2 SE |
467 | return; |
468 | ||
a73105b8 AQ |
469 | hash = bat_priv->tt_local_hash; |
470 | ||
471 | for (i = 0; i < hash->size; i++) { | |
472 | head = &hash->table[i]; | |
473 | list_lock = &hash->list_locks[i]; | |
474 | ||
475 | spin_lock_bh(list_lock); | |
48100bac | 476 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
a73105b8 AQ |
477 | head, hash_entry) { |
478 | hlist_del_rcu(node); | |
48100bac AQ |
479 | tt_local_entry = container_of(tt_common_entry, |
480 | struct tt_local_entry, | |
481 | common); | |
7683fdc1 | 482 | tt_local_entry_free_ref(tt_local_entry); |
a73105b8 AQ |
483 | } |
484 | spin_unlock_bh(list_lock); | |
485 | } | |
486 | ||
487 | hash_destroy(hash); | |
488 | ||
2dafb49d | 489 | bat_priv->tt_local_hash = NULL; |
c6c8fea2 SE |
490 | } |
491 | ||
a73105b8 | 492 | static int tt_global_init(struct bat_priv *bat_priv) |
c6c8fea2 | 493 | { |
2dafb49d | 494 | if (bat_priv->tt_global_hash) |
c6c8fea2 SE |
495 | return 1; |
496 | ||
2dafb49d | 497 | bat_priv->tt_global_hash = hash_new(1024); |
c6c8fea2 | 498 | |
2dafb49d | 499 | if (!bat_priv->tt_global_hash) |
c6c8fea2 SE |
500 | return 0; |
501 | ||
502 | return 1; | |
503 | } | |
504 | ||
a73105b8 | 505 | static void tt_changes_list_free(struct bat_priv *bat_priv) |
c6c8fea2 | 506 | { |
a73105b8 | 507 | struct tt_change_node *entry, *safe; |
c6c8fea2 | 508 | |
a73105b8 | 509 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
c6c8fea2 | 510 | |
a73105b8 AQ |
511 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
512 | list) { | |
513 | list_del(&entry->list); | |
514 | kfree(entry); | |
515 | } | |
c6c8fea2 | 516 | |
a73105b8 AQ |
517 | atomic_set(&bat_priv->tt_local_changes, 0); |
518 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); | |
519 | } | |
c6c8fea2 | 520 | |
db08e6e5 SW |
521 | /* find out if an orig_node is already in the list of a tt_global_entry. |
522 | * returns 1 if found, 0 otherwise | |
523 | */ | |
524 | static bool tt_global_entry_has_orig(const struct tt_global_entry *entry, | |
525 | const struct orig_node *orig_node) | |
526 | { | |
527 | struct tt_orig_list_entry *tmp_orig_entry; | |
528 | const struct hlist_head *head; | |
529 | struct hlist_node *node; | |
530 | bool found = false; | |
531 | ||
532 | rcu_read_lock(); | |
533 | head = &entry->orig_list; | |
534 | hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) { | |
535 | if (tmp_orig_entry->orig_node == orig_node) { | |
536 | found = true; | |
537 | break; | |
538 | } | |
539 | } | |
540 | rcu_read_unlock(); | |
541 | return found; | |
542 | } | |
543 | ||
544 | static void tt_global_add_orig_entry(struct tt_global_entry *tt_global_entry, | |
545 | struct orig_node *orig_node, | |
546 | int ttvn) | |
547 | { | |
548 | struct tt_orig_list_entry *orig_entry; | |
549 | ||
550 | orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC); | |
551 | if (!orig_entry) | |
552 | return; | |
553 | ||
554 | INIT_HLIST_NODE(&orig_entry->list); | |
555 | atomic_inc(&orig_node->refcount); | |
556 | atomic_inc(&orig_node->tt_size); | |
557 | orig_entry->orig_node = orig_node; | |
558 | orig_entry->ttvn = ttvn; | |
559 | ||
560 | spin_lock_bh(&tt_global_entry->list_lock); | |
561 | hlist_add_head_rcu(&orig_entry->list, | |
562 | &tt_global_entry->orig_list); | |
563 | spin_unlock_bh(&tt_global_entry->list_lock); | |
564 | } | |
565 | ||
a73105b8 AQ |
566 | /* caller must hold orig_node refcount */ |
567 | int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
bc279080 AQ |
568 | const unsigned char *tt_addr, uint8_t ttvn, bool roaming, |
569 | bool wifi) | |
a73105b8 | 570 | { |
db08e6e5 | 571 | struct tt_global_entry *tt_global_entry = NULL; |
7683fdc1 | 572 | int ret = 0; |
80b3f58c | 573 | int hash_added; |
c6c8fea2 | 574 | |
a73105b8 AQ |
575 | tt_global_entry = tt_global_hash_find(bat_priv, tt_addr); |
576 | ||
577 | if (!tt_global_entry) { | |
db08e6e5 SW |
578 | tt_global_entry = kzalloc(sizeof(*tt_global_entry), |
579 | GFP_ATOMIC); | |
a73105b8 | 580 | if (!tt_global_entry) |
7683fdc1 AQ |
581 | goto out; |
582 | ||
48100bac | 583 | memcpy(tt_global_entry->common.addr, tt_addr, ETH_ALEN); |
db08e6e5 | 584 | |
48100bac | 585 | tt_global_entry->common.flags = NO_FLAGS; |
cc47f66e | 586 | tt_global_entry->roam_at = 0; |
db08e6e5 SW |
587 | atomic_set(&tt_global_entry->common.refcount, 2); |
588 | ||
589 | INIT_HLIST_HEAD(&tt_global_entry->orig_list); | |
590 | spin_lock_init(&tt_global_entry->list_lock); | |
7683fdc1 | 591 | |
80b3f58c SW |
592 | hash_added = hash_add(bat_priv->tt_global_hash, compare_tt, |
593 | choose_orig, &tt_global_entry->common, | |
594 | &tt_global_entry->common.hash_entry); | |
595 | ||
596 | if (unlikely(hash_added != 0)) { | |
597 | /* remove the reference for the hash */ | |
598 | tt_global_entry_free_ref(tt_global_entry); | |
599 | goto out_remove; | |
600 | } | |
db08e6e5 SW |
601 | |
602 | tt_global_add_orig_entry(tt_global_entry, orig_node, ttvn); | |
a73105b8 | 603 | } else { |
db08e6e5 SW |
604 | /* there is already a global entry, use this one. */ |
605 | ||
606 | /* If there is the TT_CLIENT_ROAM flag set, there is only one | |
607 | * originator left in the list and we previously received a | |
608 | * delete + roaming change for this originator. | |
609 | * | |
610 | * We should first delete the old originator before adding the | |
611 | * new one. | |
612 | */ | |
613 | if (tt_global_entry->common.flags & TT_CLIENT_ROAM) { | |
614 | tt_global_del_orig_list(tt_global_entry); | |
615 | tt_global_entry->common.flags &= ~TT_CLIENT_ROAM; | |
616 | tt_global_entry->roam_at = 0; | |
a73105b8 | 617 | } |
db08e6e5 SW |
618 | |
619 | if (!tt_global_entry_has_orig(tt_global_entry, orig_node)) | |
620 | tt_global_add_orig_entry(tt_global_entry, orig_node, | |
621 | ttvn); | |
a73105b8 | 622 | } |
c6c8fea2 | 623 | |
bc279080 | 624 | if (wifi) |
48100bac | 625 | tt_global_entry->common.flags |= TT_CLIENT_WIFI; |
bc279080 | 626 | |
a73105b8 AQ |
627 | bat_dbg(DBG_TT, bat_priv, |
628 | "Creating new global tt entry: %pM (via %pM)\n", | |
48100bac | 629 | tt_global_entry->common.addr, orig_node->orig); |
c6c8fea2 | 630 | |
80b3f58c | 631 | out_remove: |
a73105b8 | 632 | /* remove address from local hash if present */ |
48100bac | 633 | tt_local_remove(bat_priv, tt_global_entry->common.addr, |
7683fdc1 AQ |
634 | "global tt received", roaming); |
635 | ret = 1; | |
636 | out: | |
637 | if (tt_global_entry) | |
638 | tt_global_entry_free_ref(tt_global_entry); | |
639 | return ret; | |
c6c8fea2 SE |
640 | } |
641 | ||
db08e6e5 SW |
642 | /* print all orig nodes who announce the address for this global entry. |
643 | * it is assumed that the caller holds rcu_read_lock(); | |
644 | */ | |
645 | static void tt_global_print_entry(struct tt_global_entry *tt_global_entry, | |
646 | struct seq_file *seq) | |
647 | { | |
648 | struct hlist_head *head; | |
649 | struct hlist_node *node; | |
650 | struct tt_orig_list_entry *orig_entry; | |
651 | struct tt_common_entry *tt_common_entry; | |
652 | uint16_t flags; | |
653 | uint8_t last_ttvn; | |
654 | ||
655 | tt_common_entry = &tt_global_entry->common; | |
656 | ||
657 | head = &tt_global_entry->orig_list; | |
658 | ||
659 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
660 | flags = tt_common_entry->flags; | |
661 | last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn); | |
662 | seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c]\n", | |
663 | tt_global_entry->common.addr, orig_entry->ttvn, | |
664 | orig_entry->orig_node->orig, last_ttvn, | |
665 | (flags & TT_CLIENT_ROAM ? 'R' : '.'), | |
666 | (flags & TT_CLIENT_WIFI ? 'W' : '.')); | |
667 | } | |
668 | } | |
669 | ||
2dafb49d | 670 | int tt_global_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
671 | { |
672 | struct net_device *net_dev = (struct net_device *)seq->private; | |
673 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
2dafb49d | 674 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
48100bac | 675 | struct tt_common_entry *tt_common_entry; |
2dafb49d | 676 | struct tt_global_entry *tt_global_entry; |
32ae9b22 | 677 | struct hard_iface *primary_if; |
7aadf889 | 678 | struct hlist_node *node; |
c6c8fea2 | 679 | struct hlist_head *head; |
c90681b8 AQ |
680 | uint32_t i; |
681 | int ret = 0; | |
32ae9b22 ML |
682 | |
683 | primary_if = primary_if_get_selected(bat_priv); | |
684 | if (!primary_if) { | |
86ceb360 SE |
685 | ret = seq_printf(seq, |
686 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
687 | net_dev->name); |
688 | goto out; | |
689 | } | |
c6c8fea2 | 690 | |
32ae9b22 | 691 | if (primary_if->if_status != IF_ACTIVE) { |
86ceb360 SE |
692 | ret = seq_printf(seq, |
693 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
694 | net_dev->name); |
695 | goto out; | |
c6c8fea2 SE |
696 | } |
697 | ||
2dafb49d AQ |
698 | seq_printf(seq, |
699 | "Globally announced TT entries received via the mesh %s\n", | |
c6c8fea2 | 700 | net_dev->name); |
df6edb9e AQ |
701 | seq_printf(seq, " %-13s %s %-15s %s %s\n", |
702 | "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags"); | |
c6c8fea2 | 703 | |
c6c8fea2 SE |
704 | for (i = 0; i < hash->size; i++) { |
705 | head = &hash->table[i]; | |
706 | ||
7aadf889 | 707 | rcu_read_lock(); |
48100bac | 708 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 709 | head, hash_entry) { |
48100bac AQ |
710 | tt_global_entry = container_of(tt_common_entry, |
711 | struct tt_global_entry, | |
712 | common); | |
db08e6e5 | 713 | tt_global_print_entry(tt_global_entry, seq); |
c6c8fea2 | 714 | } |
7aadf889 | 715 | rcu_read_unlock(); |
c6c8fea2 | 716 | } |
32ae9b22 ML |
717 | out: |
718 | if (primary_if) | |
719 | hardif_free_ref(primary_if); | |
720 | return ret; | |
c6c8fea2 SE |
721 | } |
722 | ||
db08e6e5 SW |
723 | /* deletes the orig list of a tt_global_entry */ |
724 | static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry) | |
c6c8fea2 | 725 | { |
db08e6e5 SW |
726 | struct hlist_head *head; |
727 | struct hlist_node *node, *safe; | |
728 | struct tt_orig_list_entry *orig_entry; | |
a73105b8 | 729 | |
db08e6e5 SW |
730 | spin_lock_bh(&tt_global_entry->list_lock); |
731 | head = &tt_global_entry->orig_list; | |
732 | hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { | |
733 | hlist_del_rcu(node); | |
734 | tt_orig_list_entry_free_ref(orig_entry); | |
735 | } | |
736 | spin_unlock_bh(&tt_global_entry->list_lock); | |
c6c8fea2 | 737 | |
db08e6e5 SW |
738 | } |
739 | ||
740 | static void tt_global_del_orig_entry(struct bat_priv *bat_priv, | |
741 | struct tt_global_entry *tt_global_entry, | |
742 | struct orig_node *orig_node, | |
743 | const char *message) | |
744 | { | |
745 | struct hlist_head *head; | |
746 | struct hlist_node *node, *safe; | |
747 | struct tt_orig_list_entry *orig_entry; | |
748 | ||
749 | spin_lock_bh(&tt_global_entry->list_lock); | |
750 | head = &tt_global_entry->orig_list; | |
751 | hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { | |
752 | if (orig_entry->orig_node == orig_node) { | |
753 | bat_dbg(DBG_TT, bat_priv, | |
754 | "Deleting %pM from global tt entry %pM: %s\n", | |
755 | orig_node->orig, tt_global_entry->common.addr, | |
756 | message); | |
757 | hlist_del_rcu(node); | |
758 | tt_orig_list_entry_free_ref(orig_entry); | |
759 | } | |
760 | } | |
761 | spin_unlock_bh(&tt_global_entry->list_lock); | |
762 | } | |
763 | ||
764 | static void tt_global_del_struct(struct bat_priv *bat_priv, | |
765 | struct tt_global_entry *tt_global_entry, | |
766 | const char *message) | |
767 | { | |
768 | bat_dbg(DBG_TT, bat_priv, | |
769 | "Deleting global tt entry %pM: %s\n", | |
770 | tt_global_entry->common.addr, message); | |
7683fdc1 | 771 | |
48100bac AQ |
772 | hash_remove(bat_priv->tt_global_hash, compare_tt, choose_orig, |
773 | tt_global_entry->common.addr); | |
db08e6e5 SW |
774 | tt_global_entry_free_ref(tt_global_entry); |
775 | ||
c6c8fea2 SE |
776 | } |
777 | ||
db08e6e5 SW |
778 | /* If the client is to be deleted, we check if it is the last origantor entry |
779 | * within tt_global entry. If yes, we set the TT_CLIENT_ROAM flag and the timer, | |
780 | * otherwise we simply remove the originator scheduled for deletion. | |
781 | */ | |
782 | static void tt_global_del_roaming(struct bat_priv *bat_priv, | |
783 | struct tt_global_entry *tt_global_entry, | |
784 | struct orig_node *orig_node, | |
785 | const char *message) | |
786 | { | |
787 | bool last_entry = true; | |
788 | struct hlist_head *head; | |
789 | struct hlist_node *node; | |
790 | struct tt_orig_list_entry *orig_entry; | |
791 | ||
792 | /* no local entry exists, case 1: | |
793 | * Check if this is the last one or if other entries exist. | |
794 | */ | |
795 | ||
796 | rcu_read_lock(); | |
797 | head = &tt_global_entry->orig_list; | |
798 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
799 | if (orig_entry->orig_node != orig_node) { | |
800 | last_entry = false; | |
801 | break; | |
802 | } | |
803 | } | |
804 | rcu_read_unlock(); | |
805 | ||
806 | if (last_entry) { | |
807 | /* its the last one, mark for roaming. */ | |
808 | tt_global_entry->common.flags |= TT_CLIENT_ROAM; | |
809 | tt_global_entry->roam_at = jiffies; | |
810 | } else | |
811 | /* there is another entry, we can simply delete this | |
812 | * one and can still use the other one. | |
813 | */ | |
814 | tt_global_del_orig_entry(bat_priv, tt_global_entry, | |
815 | orig_node, message); | |
816 | } | |
817 | ||
818 | ||
819 | ||
de7aae65 SE |
820 | static void tt_global_del(struct bat_priv *bat_priv, |
821 | struct orig_node *orig_node, | |
822 | const unsigned char *addr, | |
823 | const char *message, bool roaming) | |
a73105b8 | 824 | { |
7683fdc1 | 825 | struct tt_global_entry *tt_global_entry = NULL; |
797399b4 | 826 | struct tt_local_entry *tt_local_entry = NULL; |
a73105b8 | 827 | |
a73105b8 | 828 | tt_global_entry = tt_global_hash_find(bat_priv, addr); |
db08e6e5 | 829 | if (!tt_global_entry) |
7683fdc1 | 830 | goto out; |
a73105b8 | 831 | |
db08e6e5 SW |
832 | if (!roaming) { |
833 | tt_global_del_orig_entry(bat_priv, tt_global_entry, orig_node, | |
834 | message); | |
835 | ||
836 | if (hlist_empty(&tt_global_entry->orig_list)) | |
837 | tt_global_del_struct(bat_priv, tt_global_entry, | |
838 | message); | |
839 | ||
840 | goto out; | |
841 | } | |
92f90f56 SE |
842 | |
843 | /* if we are deleting a global entry due to a roam | |
844 | * event, there are two possibilities: | |
db08e6e5 SW |
845 | * 1) the client roamed from node A to node B => if there |
846 | * is only one originator left for this client, we mark | |
92f90f56 SE |
847 | * it with TT_CLIENT_ROAM, we start a timer and we |
848 | * wait for node B to claim it. In case of timeout | |
849 | * the entry is purged. | |
db08e6e5 SW |
850 | * |
851 | * If there are other originators left, we directly delete | |
852 | * the originator. | |
92f90f56 SE |
853 | * 2) the client roamed to us => we can directly delete |
854 | * the global entry, since it is useless now. */ | |
db08e6e5 | 855 | |
92f90f56 SE |
856 | tt_local_entry = tt_local_hash_find(bat_priv, |
857 | tt_global_entry->common.addr); | |
db08e6e5 SW |
858 | if (tt_local_entry) { |
859 | /* local entry exists, case 2: client roamed to us. */ | |
860 | tt_global_del_orig_list(tt_global_entry); | |
861 | tt_global_del_struct(bat_priv, tt_global_entry, message); | |
862 | } else | |
863 | /* no local entry exists, case 1: check for roaming */ | |
864 | tt_global_del_roaming(bat_priv, tt_global_entry, orig_node, | |
865 | message); | |
92f90f56 | 866 | |
92f90f56 | 867 | |
cc47f66e | 868 | out: |
7683fdc1 AQ |
869 | if (tt_global_entry) |
870 | tt_global_entry_free_ref(tt_global_entry); | |
797399b4 AQ |
871 | if (tt_local_entry) |
872 | tt_local_entry_free_ref(tt_local_entry); | |
a73105b8 AQ |
873 | } |
874 | ||
2dafb49d | 875 | void tt_global_del_orig(struct bat_priv *bat_priv, |
a73105b8 | 876 | struct orig_node *orig_node, const char *message) |
c6c8fea2 | 877 | { |
2dafb49d | 878 | struct tt_global_entry *tt_global_entry; |
48100bac | 879 | struct tt_common_entry *tt_common_entry; |
c90681b8 | 880 | uint32_t i; |
a73105b8 AQ |
881 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
882 | struct hlist_node *node, *safe; | |
883 | struct hlist_head *head; | |
7683fdc1 | 884 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c6c8fea2 | 885 | |
6e801494 SW |
886 | if (!hash) |
887 | return; | |
888 | ||
a73105b8 AQ |
889 | for (i = 0; i < hash->size; i++) { |
890 | head = &hash->table[i]; | |
7683fdc1 | 891 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 892 | |
7683fdc1 | 893 | spin_lock_bh(list_lock); |
48100bac | 894 | hlist_for_each_entry_safe(tt_common_entry, node, safe, |
7c64fd98 | 895 | head, hash_entry) { |
48100bac AQ |
896 | tt_global_entry = container_of(tt_common_entry, |
897 | struct tt_global_entry, | |
898 | common); | |
db08e6e5 SW |
899 | |
900 | tt_global_del_orig_entry(bat_priv, tt_global_entry, | |
901 | orig_node, message); | |
902 | ||
903 | if (hlist_empty(&tt_global_entry->orig_list)) { | |
7683fdc1 | 904 | bat_dbg(DBG_TT, bat_priv, |
db08e6e5 | 905 | "Deleting global tt entry %pM: %s\n", |
48100bac | 906 | tt_global_entry->common.addr, |
87944973 | 907 | message); |
7683fdc1 AQ |
908 | hlist_del_rcu(node); |
909 | tt_global_entry_free_ref(tt_global_entry); | |
910 | } | |
a73105b8 | 911 | } |
7683fdc1 | 912 | spin_unlock_bh(list_lock); |
c6c8fea2 | 913 | } |
17071578 | 914 | orig_node->tt_initialised = false; |
c6c8fea2 SE |
915 | } |
916 | ||
cc47f66e AQ |
917 | static void tt_global_roam_purge(struct bat_priv *bat_priv) |
918 | { | |
919 | struct hashtable_t *hash = bat_priv->tt_global_hash; | |
48100bac | 920 | struct tt_common_entry *tt_common_entry; |
cc47f66e AQ |
921 | struct tt_global_entry *tt_global_entry; |
922 | struct hlist_node *node, *node_tmp; | |
923 | struct hlist_head *head; | |
7683fdc1 | 924 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 925 | uint32_t i; |
cc47f66e | 926 | |
cc47f66e AQ |
927 | for (i = 0; i < hash->size; i++) { |
928 | head = &hash->table[i]; | |
7683fdc1 | 929 | list_lock = &hash->list_locks[i]; |
cc47f66e | 930 | |
7683fdc1 | 931 | spin_lock_bh(list_lock); |
48100bac | 932 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
cc47f66e | 933 | head, hash_entry) { |
48100bac AQ |
934 | tt_global_entry = container_of(tt_common_entry, |
935 | struct tt_global_entry, | |
936 | common); | |
937 | if (!(tt_global_entry->common.flags & TT_CLIENT_ROAM)) | |
cc47f66e | 938 | continue; |
a04ccd59 | 939 | if (!has_timed_out(tt_global_entry->roam_at, |
032b7969 | 940 | TT_CLIENT_ROAM_TIMEOUT)) |
cc47f66e AQ |
941 | continue; |
942 | ||
86ceb360 SE |
943 | bat_dbg(DBG_TT, bat_priv, |
944 | "Deleting global tt entry (%pM): Roaming timeout\n", | |
48100bac | 945 | tt_global_entry->common.addr); |
db08e6e5 | 946 | |
7683fdc1 AQ |
947 | hlist_del_rcu(node); |
948 | tt_global_entry_free_ref(tt_global_entry); | |
cc47f66e | 949 | } |
7683fdc1 | 950 | spin_unlock_bh(list_lock); |
cc47f66e AQ |
951 | } |
952 | ||
cc47f66e AQ |
953 | } |
954 | ||
a73105b8 | 955 | static void tt_global_table_free(struct bat_priv *bat_priv) |
c6c8fea2 | 956 | { |
7683fdc1 AQ |
957 | struct hashtable_t *hash; |
958 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
48100bac | 959 | struct tt_common_entry *tt_common_entry; |
7683fdc1 AQ |
960 | struct tt_global_entry *tt_global_entry; |
961 | struct hlist_node *node, *node_tmp; | |
962 | struct hlist_head *head; | |
c90681b8 | 963 | uint32_t i; |
7683fdc1 | 964 | |
2dafb49d | 965 | if (!bat_priv->tt_global_hash) |
c6c8fea2 SE |
966 | return; |
967 | ||
7683fdc1 AQ |
968 | hash = bat_priv->tt_global_hash; |
969 | ||
970 | for (i = 0; i < hash->size; i++) { | |
971 | head = &hash->table[i]; | |
972 | list_lock = &hash->list_locks[i]; | |
973 | ||
974 | spin_lock_bh(list_lock); | |
48100bac | 975 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
7683fdc1 AQ |
976 | head, hash_entry) { |
977 | hlist_del_rcu(node); | |
48100bac AQ |
978 | tt_global_entry = container_of(tt_common_entry, |
979 | struct tt_global_entry, | |
980 | common); | |
7683fdc1 AQ |
981 | tt_global_entry_free_ref(tt_global_entry); |
982 | } | |
983 | spin_unlock_bh(list_lock); | |
984 | } | |
985 | ||
986 | hash_destroy(hash); | |
987 | ||
2dafb49d | 988 | bat_priv->tt_global_hash = NULL; |
c6c8fea2 SE |
989 | } |
990 | ||
59b699cd AQ |
991 | static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry, |
992 | struct tt_global_entry *tt_global_entry) | |
993 | { | |
994 | bool ret = false; | |
995 | ||
48100bac AQ |
996 | if (tt_local_entry->common.flags & TT_CLIENT_WIFI && |
997 | tt_global_entry->common.flags & TT_CLIENT_WIFI) | |
59b699cd AQ |
998 | ret = true; |
999 | ||
1000 | return ret; | |
1001 | } | |
1002 | ||
747e4221 | 1003 | struct orig_node *transtable_search(struct bat_priv *bat_priv, |
3d393e47 | 1004 | const uint8_t *src, const uint8_t *addr) |
c6c8fea2 | 1005 | { |
3d393e47 AQ |
1006 | struct tt_local_entry *tt_local_entry = NULL; |
1007 | struct tt_global_entry *tt_global_entry = NULL; | |
7b36e8ee | 1008 | struct orig_node *orig_node = NULL; |
db08e6e5 SW |
1009 | struct neigh_node *router = NULL; |
1010 | struct hlist_head *head; | |
1011 | struct hlist_node *node; | |
1012 | struct tt_orig_list_entry *orig_entry; | |
1013 | int best_tq; | |
c6c8fea2 | 1014 | |
3d393e47 AQ |
1015 | if (src && atomic_read(&bat_priv->ap_isolation)) { |
1016 | tt_local_entry = tt_local_hash_find(bat_priv, src); | |
1017 | if (!tt_local_entry) | |
1018 | goto out; | |
1019 | } | |
7aadf889 | 1020 | |
3d393e47 | 1021 | tt_global_entry = tt_global_hash_find(bat_priv, addr); |
2dafb49d | 1022 | if (!tt_global_entry) |
7b36e8ee | 1023 | goto out; |
7aadf889 | 1024 | |
3d393e47 AQ |
1025 | /* check whether the clients should not communicate due to AP |
1026 | * isolation */ | |
1027 | if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry)) | |
1028 | goto out; | |
1029 | ||
db08e6e5 | 1030 | best_tq = 0; |
c6c8fea2 | 1031 | |
db08e6e5 SW |
1032 | rcu_read_lock(); |
1033 | head = &tt_global_entry->orig_list; | |
1034 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
1035 | router = orig_node_get_router(orig_entry->orig_node); | |
1036 | if (!router) | |
1037 | continue; | |
c6c8fea2 | 1038 | |
db08e6e5 SW |
1039 | if (router->tq_avg > best_tq) { |
1040 | orig_node = orig_entry->orig_node; | |
1041 | best_tq = router->tq_avg; | |
1042 | } | |
1043 | neigh_node_free_ref(router); | |
1044 | } | |
1045 | /* found anything? */ | |
1046 | if (orig_node && !atomic_inc_not_zero(&orig_node->refcount)) | |
1047 | orig_node = NULL; | |
1048 | rcu_read_unlock(); | |
7b36e8ee | 1049 | out: |
3d393e47 AQ |
1050 | if (tt_global_entry) |
1051 | tt_global_entry_free_ref(tt_global_entry); | |
1052 | if (tt_local_entry) | |
1053 | tt_local_entry_free_ref(tt_local_entry); | |
1054 | ||
7b36e8ee | 1055 | return orig_node; |
c6c8fea2 | 1056 | } |
a73105b8 AQ |
1057 | |
1058 | /* Calculates the checksum of the local table of a given orig_node */ | |
de7aae65 SE |
1059 | static uint16_t tt_global_crc(struct bat_priv *bat_priv, |
1060 | struct orig_node *orig_node) | |
a73105b8 AQ |
1061 | { |
1062 | uint16_t total = 0, total_one; | |
1063 | struct hashtable_t *hash = bat_priv->tt_global_hash; | |
48100bac | 1064 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
1065 | struct tt_global_entry *tt_global_entry; |
1066 | struct hlist_node *node; | |
1067 | struct hlist_head *head; | |
c90681b8 AQ |
1068 | uint32_t i; |
1069 | int j; | |
a73105b8 AQ |
1070 | |
1071 | for (i = 0; i < hash->size; i++) { | |
1072 | head = &hash->table[i]; | |
1073 | ||
1074 | rcu_read_lock(); | |
48100bac | 1075 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 | 1076 | head, hash_entry) { |
48100bac AQ |
1077 | tt_global_entry = container_of(tt_common_entry, |
1078 | struct tt_global_entry, | |
1079 | common); | |
db08e6e5 SW |
1080 | /* Roaming clients are in the global table for |
1081 | * consistency only. They don't have to be | |
1082 | * taken into account while computing the | |
1083 | * global crc | |
1084 | */ | |
1085 | if (tt_global_entry->common.flags & TT_CLIENT_ROAM) | |
1086 | continue; | |
1087 | ||
1088 | /* find out if this global entry is announced by this | |
1089 | * originator | |
1090 | */ | |
1091 | if (!tt_global_entry_has_orig(tt_global_entry, | |
1092 | orig_node)) | |
1093 | continue; | |
1094 | ||
1095 | total_one = 0; | |
1096 | for (j = 0; j < ETH_ALEN; j++) | |
1097 | total_one = crc16_byte(total_one, | |
1098 | tt_global_entry->common.addr[j]); | |
1099 | total ^= total_one; | |
a73105b8 AQ |
1100 | } |
1101 | rcu_read_unlock(); | |
1102 | } | |
1103 | ||
1104 | return total; | |
1105 | } | |
1106 | ||
1107 | /* Calculates the checksum of the local table */ | |
1108 | uint16_t tt_local_crc(struct bat_priv *bat_priv) | |
1109 | { | |
1110 | uint16_t total = 0, total_one; | |
1111 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
48100bac | 1112 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
1113 | struct hlist_node *node; |
1114 | struct hlist_head *head; | |
c90681b8 AQ |
1115 | uint32_t i; |
1116 | int j; | |
a73105b8 AQ |
1117 | |
1118 | for (i = 0; i < hash->size; i++) { | |
1119 | head = &hash->table[i]; | |
1120 | ||
1121 | rcu_read_lock(); | |
48100bac | 1122 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 | 1123 | head, hash_entry) { |
058d0e26 AQ |
1124 | /* not yet committed clients have not to be taken into |
1125 | * account while computing the CRC */ | |
48100bac | 1126 | if (tt_common_entry->flags & TT_CLIENT_NEW) |
058d0e26 | 1127 | continue; |
a73105b8 AQ |
1128 | total_one = 0; |
1129 | for (j = 0; j < ETH_ALEN; j++) | |
1130 | total_one = crc16_byte(total_one, | |
48100bac | 1131 | tt_common_entry->addr[j]); |
a73105b8 AQ |
1132 | total ^= total_one; |
1133 | } | |
a73105b8 AQ |
1134 | rcu_read_unlock(); |
1135 | } | |
1136 | ||
1137 | return total; | |
1138 | } | |
1139 | ||
1140 | static void tt_req_list_free(struct bat_priv *bat_priv) | |
1141 | { | |
1142 | struct tt_req_node *node, *safe; | |
1143 | ||
1144 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1145 | ||
1146 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
1147 | list_del(&node->list); | |
1148 | kfree(node); | |
1149 | } | |
1150 | ||
1151 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1152 | } | |
1153 | ||
de7aae65 SE |
1154 | static void tt_save_orig_buffer(struct bat_priv *bat_priv, |
1155 | struct orig_node *orig_node, | |
1156 | const unsigned char *tt_buff, | |
1157 | uint8_t tt_num_changes) | |
a73105b8 AQ |
1158 | { |
1159 | uint16_t tt_buff_len = tt_len(tt_num_changes); | |
1160 | ||
1161 | /* Replace the old buffer only if I received something in the | |
1162 | * last OGM (the OGM could carry no changes) */ | |
1163 | spin_lock_bh(&orig_node->tt_buff_lock); | |
1164 | if (tt_buff_len > 0) { | |
1165 | kfree(orig_node->tt_buff); | |
1166 | orig_node->tt_buff_len = 0; | |
1167 | orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); | |
1168 | if (orig_node->tt_buff) { | |
1169 | memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); | |
1170 | orig_node->tt_buff_len = tt_buff_len; | |
1171 | } | |
1172 | } | |
1173 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1174 | } | |
1175 | ||
1176 | static void tt_req_purge(struct bat_priv *bat_priv) | |
1177 | { | |
1178 | struct tt_req_node *node, *safe; | |
1179 | ||
1180 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1181 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
032b7969 | 1182 | if (has_timed_out(node->issued_at, TT_REQUEST_TIMEOUT)) { |
a73105b8 AQ |
1183 | list_del(&node->list); |
1184 | kfree(node); | |
1185 | } | |
1186 | } | |
1187 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1188 | } | |
1189 | ||
1190 | /* returns the pointer to the new tt_req_node struct if no request | |
1191 | * has already been issued for this orig_node, NULL otherwise */ | |
1192 | static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv, | |
1193 | struct orig_node *orig_node) | |
1194 | { | |
1195 | struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; | |
1196 | ||
1197 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1198 | list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) { | |
1199 | if (compare_eth(tt_req_node_tmp, orig_node) && | |
a04ccd59 | 1200 | !has_timed_out(tt_req_node_tmp->issued_at, |
032b7969 | 1201 | TT_REQUEST_TIMEOUT)) |
a73105b8 AQ |
1202 | goto unlock; |
1203 | } | |
1204 | ||
1205 | tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); | |
1206 | if (!tt_req_node) | |
1207 | goto unlock; | |
1208 | ||
1209 | memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); | |
1210 | tt_req_node->issued_at = jiffies; | |
1211 | ||
1212 | list_add(&tt_req_node->list, &bat_priv->tt_req_list); | |
1213 | unlock: | |
1214 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1215 | return tt_req_node; | |
1216 | } | |
1217 | ||
058d0e26 AQ |
1218 | /* data_ptr is useless here, but has to be kept to respect the prototype */ |
1219 | static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr) | |
1220 | { | |
48100bac | 1221 | const struct tt_common_entry *tt_common_entry = entry_ptr; |
058d0e26 | 1222 | |
48100bac | 1223 | if (tt_common_entry->flags & TT_CLIENT_NEW) |
058d0e26 AQ |
1224 | return 0; |
1225 | return 1; | |
1226 | } | |
1227 | ||
a73105b8 AQ |
1228 | static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr) |
1229 | { | |
48100bac AQ |
1230 | const struct tt_common_entry *tt_common_entry = entry_ptr; |
1231 | const struct tt_global_entry *tt_global_entry; | |
a73105b8 AQ |
1232 | const struct orig_node *orig_node = data_ptr; |
1233 | ||
48100bac | 1234 | if (tt_common_entry->flags & TT_CLIENT_ROAM) |
cc47f66e AQ |
1235 | return 0; |
1236 | ||
48100bac AQ |
1237 | tt_global_entry = container_of(tt_common_entry, struct tt_global_entry, |
1238 | common); | |
1239 | ||
db08e6e5 | 1240 | return tt_global_entry_has_orig(tt_global_entry, orig_node); |
a73105b8 AQ |
1241 | } |
1242 | ||
1243 | static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, | |
1244 | struct hashtable_t *hash, | |
1245 | struct hard_iface *primary_if, | |
1246 | int (*valid_cb)(const void *, | |
1247 | const void *), | |
1248 | void *cb_data) | |
1249 | { | |
48100bac | 1250 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
1251 | struct tt_query_packet *tt_response; |
1252 | struct tt_change *tt_change; | |
1253 | struct hlist_node *node; | |
1254 | struct hlist_head *head; | |
1255 | struct sk_buff *skb = NULL; | |
1256 | uint16_t tt_tot, tt_count; | |
1257 | ssize_t tt_query_size = sizeof(struct tt_query_packet); | |
c90681b8 | 1258 | uint32_t i; |
a73105b8 AQ |
1259 | |
1260 | if (tt_query_size + tt_len > primary_if->soft_iface->mtu) { | |
1261 | tt_len = primary_if->soft_iface->mtu - tt_query_size; | |
1262 | tt_len -= tt_len % sizeof(struct tt_change); | |
1263 | } | |
1264 | tt_tot = tt_len / sizeof(struct tt_change); | |
1265 | ||
1266 | skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN); | |
1267 | if (!skb) | |
1268 | goto out; | |
1269 | ||
1270 | skb_reserve(skb, ETH_HLEN); | |
1271 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1272 | tt_query_size + tt_len); | |
1273 | tt_response->ttvn = ttvn; | |
a73105b8 AQ |
1274 | |
1275 | tt_change = (struct tt_change *)(skb->data + tt_query_size); | |
1276 | tt_count = 0; | |
1277 | ||
1278 | rcu_read_lock(); | |
1279 | for (i = 0; i < hash->size; i++) { | |
1280 | head = &hash->table[i]; | |
1281 | ||
48100bac | 1282 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 AQ |
1283 | head, hash_entry) { |
1284 | if (tt_count == tt_tot) | |
1285 | break; | |
1286 | ||
48100bac | 1287 | if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data))) |
a73105b8 AQ |
1288 | continue; |
1289 | ||
48100bac AQ |
1290 | memcpy(tt_change->addr, tt_common_entry->addr, |
1291 | ETH_ALEN); | |
a73105b8 AQ |
1292 | tt_change->flags = NO_FLAGS; |
1293 | ||
1294 | tt_count++; | |
1295 | tt_change++; | |
1296 | } | |
1297 | } | |
1298 | rcu_read_unlock(); | |
1299 | ||
9d852393 AQ |
1300 | /* store in the message the number of entries we have successfully |
1301 | * copied */ | |
1302 | tt_response->tt_data = htons(tt_count); | |
1303 | ||
a73105b8 AQ |
1304 | out: |
1305 | return skb; | |
1306 | } | |
1307 | ||
a943cac1 ML |
1308 | static int send_tt_request(struct bat_priv *bat_priv, |
1309 | struct orig_node *dst_orig_node, | |
1310 | uint8_t ttvn, uint16_t tt_crc, bool full_table) | |
a73105b8 AQ |
1311 | { |
1312 | struct sk_buff *skb = NULL; | |
1313 | struct tt_query_packet *tt_request; | |
1314 | struct neigh_node *neigh_node = NULL; | |
1315 | struct hard_iface *primary_if; | |
1316 | struct tt_req_node *tt_req_node = NULL; | |
1317 | int ret = 1; | |
1318 | ||
1319 | primary_if = primary_if_get_selected(bat_priv); | |
1320 | if (!primary_if) | |
1321 | goto out; | |
1322 | ||
1323 | /* The new tt_req will be issued only if I'm not waiting for a | |
1324 | * reply from the same orig_node yet */ | |
1325 | tt_req_node = new_tt_req_node(bat_priv, dst_orig_node); | |
1326 | if (!tt_req_node) | |
1327 | goto out; | |
1328 | ||
1329 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN); | |
1330 | if (!skb) | |
1331 | goto out; | |
1332 | ||
1333 | skb_reserve(skb, ETH_HLEN); | |
1334 | ||
1335 | tt_request = (struct tt_query_packet *)skb_put(skb, | |
1336 | sizeof(struct tt_query_packet)); | |
1337 | ||
76543d14 SE |
1338 | tt_request->header.packet_type = BAT_TT_QUERY; |
1339 | tt_request->header.version = COMPAT_VERSION; | |
a73105b8 AQ |
1340 | memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1341 | memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN); | |
76543d14 | 1342 | tt_request->header.ttl = TTL; |
a73105b8 | 1343 | tt_request->ttvn = ttvn; |
6d2003fc | 1344 | tt_request->tt_data = htons(tt_crc); |
a73105b8 AQ |
1345 | tt_request->flags = TT_REQUEST; |
1346 | ||
1347 | if (full_table) | |
1348 | tt_request->flags |= TT_FULL_TABLE; | |
1349 | ||
1350 | neigh_node = orig_node_get_router(dst_orig_node); | |
1351 | if (!neigh_node) | |
1352 | goto out; | |
1353 | ||
86ceb360 SE |
1354 | bat_dbg(DBG_TT, bat_priv, |
1355 | "Sending TT_REQUEST to %pM via %pM [%c]\n", | |
1356 | dst_orig_node->orig, neigh_node->addr, | |
a73105b8 AQ |
1357 | (full_table ? 'F' : '.')); |
1358 | ||
1359 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1360 | ret = 0; | |
1361 | ||
1362 | out: | |
1363 | if (neigh_node) | |
1364 | neigh_node_free_ref(neigh_node); | |
1365 | if (primary_if) | |
1366 | hardif_free_ref(primary_if); | |
1367 | if (ret) | |
1368 | kfree_skb(skb); | |
1369 | if (ret && tt_req_node) { | |
1370 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1371 | list_del(&tt_req_node->list); | |
1372 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1373 | kfree(tt_req_node); | |
1374 | } | |
1375 | return ret; | |
1376 | } | |
1377 | ||
1378 | static bool send_other_tt_response(struct bat_priv *bat_priv, | |
1379 | struct tt_query_packet *tt_request) | |
1380 | { | |
1381 | struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL; | |
1382 | struct neigh_node *neigh_node = NULL; | |
1383 | struct hard_iface *primary_if = NULL; | |
1384 | uint8_t orig_ttvn, req_ttvn, ttvn; | |
1385 | int ret = false; | |
1386 | unsigned char *tt_buff; | |
1387 | bool full_table; | |
1388 | uint16_t tt_len, tt_tot; | |
1389 | struct sk_buff *skb = NULL; | |
1390 | struct tt_query_packet *tt_response; | |
1391 | ||
1392 | bat_dbg(DBG_TT, bat_priv, | |
86ceb360 SE |
1393 | "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", |
1394 | tt_request->src, tt_request->ttvn, tt_request->dst, | |
a73105b8 AQ |
1395 | (tt_request->flags & TT_FULL_TABLE ? 'F' : '.')); |
1396 | ||
1397 | /* Let's get the orig node of the REAL destination */ | |
eb7e2a1e | 1398 | req_dst_orig_node = orig_hash_find(bat_priv, tt_request->dst); |
a73105b8 AQ |
1399 | if (!req_dst_orig_node) |
1400 | goto out; | |
1401 | ||
eb7e2a1e | 1402 | res_dst_orig_node = orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1403 | if (!res_dst_orig_node) |
1404 | goto out; | |
1405 | ||
1406 | neigh_node = orig_node_get_router(res_dst_orig_node); | |
1407 | if (!neigh_node) | |
1408 | goto out; | |
1409 | ||
1410 | primary_if = primary_if_get_selected(bat_priv); | |
1411 | if (!primary_if) | |
1412 | goto out; | |
1413 | ||
1414 | orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1415 | req_ttvn = tt_request->ttvn; | |
1416 | ||
015758d0 | 1417 | /* I don't have the requested data */ |
a73105b8 AQ |
1418 | if (orig_ttvn != req_ttvn || |
1419 | tt_request->tt_data != req_dst_orig_node->tt_crc) | |
1420 | goto out; | |
1421 | ||
015758d0 | 1422 | /* If the full table has been explicitly requested */ |
a73105b8 AQ |
1423 | if (tt_request->flags & TT_FULL_TABLE || |
1424 | !req_dst_orig_node->tt_buff) | |
1425 | full_table = true; | |
1426 | else | |
1427 | full_table = false; | |
1428 | ||
1429 | /* In this version, fragmentation is not implemented, then | |
1430 | * I'll send only one packet with as much TT entries as I can */ | |
1431 | if (!full_table) { | |
1432 | spin_lock_bh(&req_dst_orig_node->tt_buff_lock); | |
1433 | tt_len = req_dst_orig_node->tt_buff_len; | |
1434 | tt_tot = tt_len / sizeof(struct tt_change); | |
1435 | ||
1436 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + | |
1437 | tt_len + ETH_HLEN); | |
1438 | if (!skb) | |
1439 | goto unlock; | |
1440 | ||
1441 | skb_reserve(skb, ETH_HLEN); | |
1442 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1443 | sizeof(struct tt_query_packet) + tt_len); | |
1444 | tt_response->ttvn = req_ttvn; | |
1445 | tt_response->tt_data = htons(tt_tot); | |
1446 | ||
1447 | tt_buff = skb->data + sizeof(struct tt_query_packet); | |
1448 | /* Copy the last orig_node's OGM buffer */ | |
1449 | memcpy(tt_buff, req_dst_orig_node->tt_buff, | |
1450 | req_dst_orig_node->tt_buff_len); | |
1451 | ||
1452 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1453 | } else { | |
1454 | tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) * | |
1455 | sizeof(struct tt_change); | |
1456 | ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1457 | ||
1458 | skb = tt_response_fill_table(tt_len, ttvn, | |
1459 | bat_priv->tt_global_hash, | |
1460 | primary_if, tt_global_valid_entry, | |
1461 | req_dst_orig_node); | |
1462 | if (!skb) | |
1463 | goto out; | |
1464 | ||
1465 | tt_response = (struct tt_query_packet *)skb->data; | |
1466 | } | |
1467 | ||
76543d14 SE |
1468 | tt_response->header.packet_type = BAT_TT_QUERY; |
1469 | tt_response->header.version = COMPAT_VERSION; | |
1470 | tt_response->header.ttl = TTL; | |
a73105b8 AQ |
1471 | memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN); |
1472 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
1473 | tt_response->flags = TT_RESPONSE; | |
1474 | ||
1475 | if (full_table) | |
1476 | tt_response->flags |= TT_FULL_TABLE; | |
1477 | ||
1478 | bat_dbg(DBG_TT, bat_priv, | |
1479 | "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n", | |
1480 | res_dst_orig_node->orig, neigh_node->addr, | |
1481 | req_dst_orig_node->orig, req_ttvn); | |
1482 | ||
1483 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1484 | ret = true; | |
1485 | goto out; | |
1486 | ||
1487 | unlock: | |
1488 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1489 | ||
1490 | out: | |
1491 | if (res_dst_orig_node) | |
1492 | orig_node_free_ref(res_dst_orig_node); | |
1493 | if (req_dst_orig_node) | |
1494 | orig_node_free_ref(req_dst_orig_node); | |
1495 | if (neigh_node) | |
1496 | neigh_node_free_ref(neigh_node); | |
1497 | if (primary_if) | |
1498 | hardif_free_ref(primary_if); | |
1499 | if (!ret) | |
1500 | kfree_skb(skb); | |
1501 | return ret; | |
1502 | ||
1503 | } | |
1504 | static bool send_my_tt_response(struct bat_priv *bat_priv, | |
1505 | struct tt_query_packet *tt_request) | |
1506 | { | |
1507 | struct orig_node *orig_node = NULL; | |
1508 | struct neigh_node *neigh_node = NULL; | |
1509 | struct hard_iface *primary_if = NULL; | |
1510 | uint8_t my_ttvn, req_ttvn, ttvn; | |
1511 | int ret = false; | |
1512 | unsigned char *tt_buff; | |
1513 | bool full_table; | |
1514 | uint16_t tt_len, tt_tot; | |
1515 | struct sk_buff *skb = NULL; | |
1516 | struct tt_query_packet *tt_response; | |
1517 | ||
1518 | bat_dbg(DBG_TT, bat_priv, | |
86ceb360 SE |
1519 | "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", |
1520 | tt_request->src, tt_request->ttvn, | |
a73105b8 AQ |
1521 | (tt_request->flags & TT_FULL_TABLE ? 'F' : '.')); |
1522 | ||
1523 | ||
1524 | my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1525 | req_ttvn = tt_request->ttvn; | |
1526 | ||
eb7e2a1e | 1527 | orig_node = orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1528 | if (!orig_node) |
1529 | goto out; | |
1530 | ||
1531 | neigh_node = orig_node_get_router(orig_node); | |
1532 | if (!neigh_node) | |
1533 | goto out; | |
1534 | ||
1535 | primary_if = primary_if_get_selected(bat_priv); | |
1536 | if (!primary_if) | |
1537 | goto out; | |
1538 | ||
1539 | /* If the full table has been explicitly requested or the gap | |
1540 | * is too big send the whole local translation table */ | |
1541 | if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn || | |
1542 | !bat_priv->tt_buff) | |
1543 | full_table = true; | |
1544 | else | |
1545 | full_table = false; | |
1546 | ||
1547 | /* In this version, fragmentation is not implemented, then | |
1548 | * I'll send only one packet with as much TT entries as I can */ | |
1549 | if (!full_table) { | |
1550 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
1551 | tt_len = bat_priv->tt_buff_len; | |
1552 | tt_tot = tt_len / sizeof(struct tt_change); | |
1553 | ||
1554 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + | |
1555 | tt_len + ETH_HLEN); | |
1556 | if (!skb) | |
1557 | goto unlock; | |
1558 | ||
1559 | skb_reserve(skb, ETH_HLEN); | |
1560 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1561 | sizeof(struct tt_query_packet) + tt_len); | |
1562 | tt_response->ttvn = req_ttvn; | |
1563 | tt_response->tt_data = htons(tt_tot); | |
1564 | ||
1565 | tt_buff = skb->data + sizeof(struct tt_query_packet); | |
1566 | memcpy(tt_buff, bat_priv->tt_buff, | |
1567 | bat_priv->tt_buff_len); | |
1568 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1569 | } else { | |
1570 | tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) * | |
1571 | sizeof(struct tt_change); | |
1572 | ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1573 | ||
1574 | skb = tt_response_fill_table(tt_len, ttvn, | |
1575 | bat_priv->tt_local_hash, | |
058d0e26 AQ |
1576 | primary_if, tt_local_valid_entry, |
1577 | NULL); | |
a73105b8 AQ |
1578 | if (!skb) |
1579 | goto out; | |
1580 | ||
1581 | tt_response = (struct tt_query_packet *)skb->data; | |
1582 | } | |
1583 | ||
76543d14 SE |
1584 | tt_response->header.packet_type = BAT_TT_QUERY; |
1585 | tt_response->header.version = COMPAT_VERSION; | |
1586 | tt_response->header.ttl = TTL; | |
a73105b8 AQ |
1587 | memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1588 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
1589 | tt_response->flags = TT_RESPONSE; | |
1590 | ||
1591 | if (full_table) | |
1592 | tt_response->flags |= TT_FULL_TABLE; | |
1593 | ||
1594 | bat_dbg(DBG_TT, bat_priv, | |
1595 | "Sending TT_RESPONSE to %pM via %pM [%c]\n", | |
1596 | orig_node->orig, neigh_node->addr, | |
1597 | (tt_response->flags & TT_FULL_TABLE ? 'F' : '.')); | |
1598 | ||
1599 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1600 | ret = true; | |
1601 | goto out; | |
1602 | ||
1603 | unlock: | |
1604 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1605 | out: | |
1606 | if (orig_node) | |
1607 | orig_node_free_ref(orig_node); | |
1608 | if (neigh_node) | |
1609 | neigh_node_free_ref(neigh_node); | |
1610 | if (primary_if) | |
1611 | hardif_free_ref(primary_if); | |
1612 | if (!ret) | |
1613 | kfree_skb(skb); | |
1614 | /* This packet was for me, so it doesn't need to be re-routed */ | |
1615 | return true; | |
1616 | } | |
1617 | ||
1618 | bool send_tt_response(struct bat_priv *bat_priv, | |
1619 | struct tt_query_packet *tt_request) | |
1620 | { | |
20ff9d59 SW |
1621 | if (is_my_mac(tt_request->dst)) { |
1622 | /* don't answer backbone gws! */ | |
1623 | if (bla_is_backbone_gw_orig(bat_priv, tt_request->src)) | |
1624 | return true; | |
1625 | ||
a73105b8 | 1626 | return send_my_tt_response(bat_priv, tt_request); |
20ff9d59 | 1627 | } else { |
a73105b8 | 1628 | return send_other_tt_response(bat_priv, tt_request); |
20ff9d59 | 1629 | } |
a73105b8 AQ |
1630 | } |
1631 | ||
1632 | static void _tt_update_changes(struct bat_priv *bat_priv, | |
1633 | struct orig_node *orig_node, | |
1634 | struct tt_change *tt_change, | |
1635 | uint16_t tt_num_changes, uint8_t ttvn) | |
1636 | { | |
1637 | int i; | |
1638 | ||
1639 | for (i = 0; i < tt_num_changes; i++) { | |
5fbc1598 | 1640 | if ((tt_change + i)->flags & TT_CLIENT_DEL) |
a73105b8 AQ |
1641 | tt_global_del(bat_priv, orig_node, |
1642 | (tt_change + i)->addr, | |
cc47f66e AQ |
1643 | "tt removed by changes", |
1644 | (tt_change + i)->flags & TT_CLIENT_ROAM); | |
a73105b8 AQ |
1645 | else |
1646 | if (!tt_global_add(bat_priv, orig_node, | |
bc279080 AQ |
1647 | (tt_change + i)->addr, ttvn, false, |
1648 | (tt_change + i)->flags & | |
1649 | TT_CLIENT_WIFI)) | |
a73105b8 AQ |
1650 | /* In case of problem while storing a |
1651 | * global_entry, we stop the updating | |
1652 | * procedure without committing the | |
1653 | * ttvn change. This will avoid to send | |
1654 | * corrupted data on tt_request | |
1655 | */ | |
1656 | return; | |
1657 | } | |
17071578 | 1658 | orig_node->tt_initialised = true; |
a73105b8 AQ |
1659 | } |
1660 | ||
1661 | static void tt_fill_gtable(struct bat_priv *bat_priv, | |
1662 | struct tt_query_packet *tt_response) | |
1663 | { | |
1664 | struct orig_node *orig_node = NULL; | |
1665 | ||
1666 | orig_node = orig_hash_find(bat_priv, tt_response->src); | |
1667 | if (!orig_node) | |
1668 | goto out; | |
1669 | ||
1670 | /* Purge the old table first.. */ | |
1671 | tt_global_del_orig(bat_priv, orig_node, "Received full table"); | |
1672 | ||
1673 | _tt_update_changes(bat_priv, orig_node, | |
1674 | (struct tt_change *)(tt_response + 1), | |
1675 | tt_response->tt_data, tt_response->ttvn); | |
1676 | ||
1677 | spin_lock_bh(&orig_node->tt_buff_lock); | |
1678 | kfree(orig_node->tt_buff); | |
1679 | orig_node->tt_buff_len = 0; | |
1680 | orig_node->tt_buff = NULL; | |
1681 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1682 | ||
1683 | atomic_set(&orig_node->last_ttvn, tt_response->ttvn); | |
1684 | ||
1685 | out: | |
1686 | if (orig_node) | |
1687 | orig_node_free_ref(orig_node); | |
1688 | } | |
1689 | ||
a943cac1 ML |
1690 | static void tt_update_changes(struct bat_priv *bat_priv, |
1691 | struct orig_node *orig_node, | |
1692 | uint16_t tt_num_changes, uint8_t ttvn, | |
1693 | struct tt_change *tt_change) | |
a73105b8 AQ |
1694 | { |
1695 | _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes, | |
1696 | ttvn); | |
1697 | ||
1698 | tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change, | |
1699 | tt_num_changes); | |
1700 | atomic_set(&orig_node->last_ttvn, ttvn); | |
1701 | } | |
1702 | ||
1703 | bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr) | |
1704 | { | |
7683fdc1 AQ |
1705 | struct tt_local_entry *tt_local_entry = NULL; |
1706 | bool ret = false; | |
a73105b8 | 1707 | |
a73105b8 | 1708 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
1709 | if (!tt_local_entry) |
1710 | goto out; | |
058d0e26 AQ |
1711 | /* Check if the client has been logically deleted (but is kept for |
1712 | * consistency purpose) */ | |
48100bac | 1713 | if (tt_local_entry->common.flags & TT_CLIENT_PENDING) |
058d0e26 | 1714 | goto out; |
7683fdc1 AQ |
1715 | ret = true; |
1716 | out: | |
a73105b8 | 1717 | if (tt_local_entry) |
7683fdc1 AQ |
1718 | tt_local_entry_free_ref(tt_local_entry); |
1719 | return ret; | |
a73105b8 AQ |
1720 | } |
1721 | ||
1722 | void handle_tt_response(struct bat_priv *bat_priv, | |
1723 | struct tt_query_packet *tt_response) | |
1724 | { | |
1725 | struct tt_req_node *node, *safe; | |
1726 | struct orig_node *orig_node = NULL; | |
1727 | ||
86ceb360 SE |
1728 | bat_dbg(DBG_TT, bat_priv, |
1729 | "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", | |
1730 | tt_response->src, tt_response->ttvn, tt_response->tt_data, | |
a73105b8 AQ |
1731 | (tt_response->flags & TT_FULL_TABLE ? 'F' : '.')); |
1732 | ||
20ff9d59 SW |
1733 | /* we should have never asked a backbone gw */ |
1734 | if (bla_is_backbone_gw_orig(bat_priv, tt_response->src)) | |
1735 | goto out; | |
1736 | ||
a73105b8 AQ |
1737 | orig_node = orig_hash_find(bat_priv, tt_response->src); |
1738 | if (!orig_node) | |
1739 | goto out; | |
1740 | ||
1741 | if (tt_response->flags & TT_FULL_TABLE) | |
1742 | tt_fill_gtable(bat_priv, tt_response); | |
1743 | else | |
1744 | tt_update_changes(bat_priv, orig_node, tt_response->tt_data, | |
1745 | tt_response->ttvn, | |
1746 | (struct tt_change *)(tt_response + 1)); | |
1747 | ||
1748 | /* Delete the tt_req_node from pending tt_requests list */ | |
1749 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1750 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
1751 | if (!compare_eth(node->addr, tt_response->src)) | |
1752 | continue; | |
1753 | list_del(&node->list); | |
1754 | kfree(node); | |
1755 | } | |
1756 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1757 | ||
1758 | /* Recalculate the CRC for this orig_node and store it */ | |
a73105b8 | 1759 | orig_node->tt_crc = tt_global_crc(bat_priv, orig_node); |
cc47f66e AQ |
1760 | /* Roaming phase is over: tables are in sync again. I can |
1761 | * unset the flag */ | |
1762 | orig_node->tt_poss_change = false; | |
a73105b8 AQ |
1763 | out: |
1764 | if (orig_node) | |
1765 | orig_node_free_ref(orig_node); | |
1766 | } | |
1767 | ||
1768 | int tt_init(struct bat_priv *bat_priv) | |
1769 | { | |
1770 | if (!tt_local_init(bat_priv)) | |
1771 | return 0; | |
1772 | ||
1773 | if (!tt_global_init(bat_priv)) | |
1774 | return 0; | |
1775 | ||
1776 | tt_start_timer(bat_priv); | |
1777 | ||
1778 | return 1; | |
1779 | } | |
1780 | ||
cc47f66e | 1781 | static void tt_roam_list_free(struct bat_priv *bat_priv) |
a73105b8 | 1782 | { |
cc47f66e | 1783 | struct tt_roam_node *node, *safe; |
a73105b8 | 1784 | |
cc47f66e | 1785 | spin_lock_bh(&bat_priv->tt_roam_list_lock); |
a73105b8 | 1786 | |
cc47f66e AQ |
1787 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { |
1788 | list_del(&node->list); | |
1789 | kfree(node); | |
1790 | } | |
1791 | ||
1792 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1793 | } | |
1794 | ||
1795 | static void tt_roam_purge(struct bat_priv *bat_priv) | |
1796 | { | |
1797 | struct tt_roam_node *node, *safe; | |
1798 | ||
1799 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1800 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { | |
032b7969 | 1801 | if (!has_timed_out(node->first_time, ROAMING_MAX_TIME)) |
cc47f66e AQ |
1802 | continue; |
1803 | ||
1804 | list_del(&node->list); | |
1805 | kfree(node); | |
1806 | } | |
1807 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1808 | } | |
1809 | ||
1810 | /* This function checks whether the client already reached the | |
1811 | * maximum number of possible roaming phases. In this case the ROAMING_ADV | |
1812 | * will not be sent. | |
1813 | * | |
1814 | * returns true if the ROAMING_ADV can be sent, false otherwise */ | |
1815 | static bool tt_check_roam_count(struct bat_priv *bat_priv, | |
1816 | uint8_t *client) | |
1817 | { | |
1818 | struct tt_roam_node *tt_roam_node; | |
1819 | bool ret = false; | |
1820 | ||
1821 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1822 | /* The new tt_req will be issued only if I'm not waiting for a | |
1823 | * reply from the same orig_node yet */ | |
1824 | list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) { | |
1825 | if (!compare_eth(tt_roam_node->addr, client)) | |
1826 | continue; | |
1827 | ||
032b7969 | 1828 | if (has_timed_out(tt_roam_node->first_time, ROAMING_MAX_TIME)) |
cc47f66e AQ |
1829 | continue; |
1830 | ||
1831 | if (!atomic_dec_not_zero(&tt_roam_node->counter)) | |
1832 | /* Sorry, you roamed too many times! */ | |
1833 | goto unlock; | |
1834 | ret = true; | |
1835 | break; | |
1836 | } | |
1837 | ||
1838 | if (!ret) { | |
1839 | tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); | |
1840 | if (!tt_roam_node) | |
1841 | goto unlock; | |
1842 | ||
1843 | tt_roam_node->first_time = jiffies; | |
1844 | atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1); | |
1845 | memcpy(tt_roam_node->addr, client, ETH_ALEN); | |
1846 | ||
1847 | list_add(&tt_roam_node->list, &bat_priv->tt_roam_list); | |
1848 | ret = true; | |
1849 | } | |
1850 | ||
1851 | unlock: | |
1852 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1853 | return ret; | |
1854 | } | |
1855 | ||
de7aae65 SE |
1856 | static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client, |
1857 | struct orig_node *orig_node) | |
cc47f66e AQ |
1858 | { |
1859 | struct neigh_node *neigh_node = NULL; | |
1860 | struct sk_buff *skb = NULL; | |
1861 | struct roam_adv_packet *roam_adv_packet; | |
1862 | int ret = 1; | |
1863 | struct hard_iface *primary_if; | |
1864 | ||
1865 | /* before going on we have to check whether the client has | |
1866 | * already roamed to us too many times */ | |
1867 | if (!tt_check_roam_count(bat_priv, client)) | |
1868 | goto out; | |
1869 | ||
1870 | skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN); | |
1871 | if (!skb) | |
1872 | goto out; | |
1873 | ||
1874 | skb_reserve(skb, ETH_HLEN); | |
1875 | ||
1876 | roam_adv_packet = (struct roam_adv_packet *)skb_put(skb, | |
1877 | sizeof(struct roam_adv_packet)); | |
1878 | ||
76543d14 SE |
1879 | roam_adv_packet->header.packet_type = BAT_ROAM_ADV; |
1880 | roam_adv_packet->header.version = COMPAT_VERSION; | |
1881 | roam_adv_packet->header.ttl = TTL; | |
cc47f66e AQ |
1882 | primary_if = primary_if_get_selected(bat_priv); |
1883 | if (!primary_if) | |
1884 | goto out; | |
1885 | memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN); | |
1886 | hardif_free_ref(primary_if); | |
1887 | memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN); | |
1888 | memcpy(roam_adv_packet->client, client, ETH_ALEN); | |
1889 | ||
1890 | neigh_node = orig_node_get_router(orig_node); | |
1891 | if (!neigh_node) | |
1892 | goto out; | |
1893 | ||
1894 | bat_dbg(DBG_TT, bat_priv, | |
1895 | "Sending ROAMING_ADV to %pM (client %pM) via %pM\n", | |
1896 | orig_node->orig, client, neigh_node->addr); | |
1897 | ||
1898 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1899 | ret = 0; | |
1900 | ||
1901 | out: | |
1902 | if (neigh_node) | |
1903 | neigh_node_free_ref(neigh_node); | |
1904 | if (ret) | |
1905 | kfree_skb(skb); | |
1906 | return; | |
a73105b8 AQ |
1907 | } |
1908 | ||
1909 | static void tt_purge(struct work_struct *work) | |
1910 | { | |
1911 | struct delayed_work *delayed_work = | |
1912 | container_of(work, struct delayed_work, work); | |
1913 | struct bat_priv *bat_priv = | |
1914 | container_of(delayed_work, struct bat_priv, tt_work); | |
1915 | ||
1916 | tt_local_purge(bat_priv); | |
cc47f66e | 1917 | tt_global_roam_purge(bat_priv); |
a73105b8 | 1918 | tt_req_purge(bat_priv); |
cc47f66e | 1919 | tt_roam_purge(bat_priv); |
a73105b8 AQ |
1920 | |
1921 | tt_start_timer(bat_priv); | |
1922 | } | |
cc47f66e AQ |
1923 | |
1924 | void tt_free(struct bat_priv *bat_priv) | |
1925 | { | |
1926 | cancel_delayed_work_sync(&bat_priv->tt_work); | |
1927 | ||
1928 | tt_local_table_free(bat_priv); | |
1929 | tt_global_table_free(bat_priv); | |
1930 | tt_req_list_free(bat_priv); | |
1931 | tt_changes_list_free(bat_priv); | |
1932 | tt_roam_list_free(bat_priv); | |
1933 | ||
1934 | kfree(bat_priv->tt_buff); | |
1935 | } | |
058d0e26 | 1936 | |
697f2531 AQ |
1937 | /* This function will enable or disable the specified flags for all the entries |
1938 | * in the given hash table and returns the number of modified entries */ | |
1939 | static uint16_t tt_set_flags(struct hashtable_t *hash, uint16_t flags, | |
1940 | bool enable) | |
058d0e26 | 1941 | { |
c90681b8 | 1942 | uint32_t i; |
697f2531 | 1943 | uint16_t changed_num = 0; |
058d0e26 AQ |
1944 | struct hlist_head *head; |
1945 | struct hlist_node *node; | |
48100bac | 1946 | struct tt_common_entry *tt_common_entry; |
058d0e26 AQ |
1947 | |
1948 | if (!hash) | |
697f2531 | 1949 | goto out; |
058d0e26 AQ |
1950 | |
1951 | for (i = 0; i < hash->size; i++) { | |
1952 | head = &hash->table[i]; | |
1953 | ||
1954 | rcu_read_lock(); | |
48100bac | 1955 | hlist_for_each_entry_rcu(tt_common_entry, node, |
058d0e26 | 1956 | head, hash_entry) { |
697f2531 AQ |
1957 | if (enable) { |
1958 | if ((tt_common_entry->flags & flags) == flags) | |
1959 | continue; | |
1960 | tt_common_entry->flags |= flags; | |
1961 | } else { | |
1962 | if (!(tt_common_entry->flags & flags)) | |
1963 | continue; | |
1964 | tt_common_entry->flags &= ~flags; | |
1965 | } | |
1966 | changed_num++; | |
058d0e26 AQ |
1967 | } |
1968 | rcu_read_unlock(); | |
1969 | } | |
697f2531 AQ |
1970 | out: |
1971 | return changed_num; | |
058d0e26 AQ |
1972 | } |
1973 | ||
1974 | /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */ | |
1975 | static void tt_local_purge_pending_clients(struct bat_priv *bat_priv) | |
1976 | { | |
1977 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
48100bac | 1978 | struct tt_common_entry *tt_common_entry; |
058d0e26 AQ |
1979 | struct tt_local_entry *tt_local_entry; |
1980 | struct hlist_node *node, *node_tmp; | |
1981 | struct hlist_head *head; | |
1982 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
c90681b8 | 1983 | uint32_t i; |
058d0e26 AQ |
1984 | |
1985 | if (!hash) | |
1986 | return; | |
1987 | ||
1988 | for (i = 0; i < hash->size; i++) { | |
1989 | head = &hash->table[i]; | |
1990 | list_lock = &hash->list_locks[i]; | |
1991 | ||
1992 | spin_lock_bh(list_lock); | |
48100bac | 1993 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
058d0e26 | 1994 | head, hash_entry) { |
48100bac | 1995 | if (!(tt_common_entry->flags & TT_CLIENT_PENDING)) |
058d0e26 AQ |
1996 | continue; |
1997 | ||
86ceb360 SE |
1998 | bat_dbg(DBG_TT, bat_priv, |
1999 | "Deleting local tt entry (%pM): pending\n", | |
2000 | tt_common_entry->addr); | |
058d0e26 AQ |
2001 | |
2002 | atomic_dec(&bat_priv->num_local_tt); | |
2003 | hlist_del_rcu(node); | |
48100bac AQ |
2004 | tt_local_entry = container_of(tt_common_entry, |
2005 | struct tt_local_entry, | |
2006 | common); | |
058d0e26 AQ |
2007 | tt_local_entry_free_ref(tt_local_entry); |
2008 | } | |
2009 | spin_unlock_bh(list_lock); | |
2010 | } | |
2011 | ||
2012 | } | |
2013 | ||
2014 | void tt_commit_changes(struct bat_priv *bat_priv) | |
2015 | { | |
697f2531 AQ |
2016 | uint16_t changed_num = tt_set_flags(bat_priv->tt_local_hash, |
2017 | TT_CLIENT_NEW, false); | |
2018 | /* all the reset entries have now to be effectively counted as local | |
2019 | * entries */ | |
2020 | atomic_add(changed_num, &bat_priv->num_local_tt); | |
058d0e26 AQ |
2021 | tt_local_purge_pending_clients(bat_priv); |
2022 | ||
2023 | /* Increment the TTVN only once per OGM interval */ | |
2024 | atomic_inc(&bat_priv->ttvn); | |
db08e6e5 SW |
2025 | bat_dbg(DBG_TT, bat_priv, "Local changes committed, updating to ttvn %u\n", |
2026 | (uint8_t)atomic_read(&bat_priv->ttvn)); | |
058d0e26 AQ |
2027 | bat_priv->tt_poss_change = false; |
2028 | } | |
59b699cd AQ |
2029 | |
2030 | bool is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, uint8_t *dst) | |
2031 | { | |
2032 | struct tt_local_entry *tt_local_entry = NULL; | |
2033 | struct tt_global_entry *tt_global_entry = NULL; | |
5870adc6 | 2034 | bool ret = false; |
59b699cd AQ |
2035 | |
2036 | if (!atomic_read(&bat_priv->ap_isolation)) | |
5870adc6 | 2037 | goto out; |
59b699cd AQ |
2038 | |
2039 | tt_local_entry = tt_local_hash_find(bat_priv, dst); | |
2040 | if (!tt_local_entry) | |
2041 | goto out; | |
2042 | ||
2043 | tt_global_entry = tt_global_hash_find(bat_priv, src); | |
2044 | if (!tt_global_entry) | |
2045 | goto out; | |
2046 | ||
5870adc6 | 2047 | if (!_is_ap_isolated(tt_local_entry, tt_global_entry)) |
59b699cd AQ |
2048 | goto out; |
2049 | ||
5870adc6 | 2050 | ret = true; |
59b699cd AQ |
2051 | |
2052 | out: | |
2053 | if (tt_global_entry) | |
2054 | tt_global_entry_free_ref(tt_global_entry); | |
2055 | if (tt_local_entry) | |
2056 | tt_local_entry_free_ref(tt_local_entry); | |
2057 | return ret; | |
2058 | } | |
a943cac1 ML |
2059 | |
2060 | void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
2061 | const unsigned char *tt_buff, uint8_t tt_num_changes, | |
2062 | uint8_t ttvn, uint16_t tt_crc) | |
2063 | { | |
2064 | uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
2065 | bool full_table = true; | |
2066 | ||
20ff9d59 SW |
2067 | /* don't care about a backbone gateways updates. */ |
2068 | if (bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) | |
2069 | return; | |
2070 | ||
17071578 AQ |
2071 | /* orig table not initialised AND first diff is in the OGM OR the ttvn |
2072 | * increased by one -> we can apply the attached changes */ | |
2073 | if ((!orig_node->tt_initialised && ttvn == 1) || | |
2074 | ttvn - orig_ttvn == 1) { | |
a943cac1 ML |
2075 | /* the OGM could not contain the changes due to their size or |
2076 | * because they have already been sent TT_OGM_APPEND_MAX times. | |
2077 | * In this case send a tt request */ | |
2078 | if (!tt_num_changes) { | |
2079 | full_table = false; | |
2080 | goto request_table; | |
2081 | } | |
2082 | ||
2083 | tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn, | |
2084 | (struct tt_change *)tt_buff); | |
2085 | ||
2086 | /* Even if we received the precomputed crc with the OGM, we | |
2087 | * prefer to recompute it to spot any possible inconsistency | |
2088 | * in the global table */ | |
2089 | orig_node->tt_crc = tt_global_crc(bat_priv, orig_node); | |
2090 | ||
2091 | /* The ttvn alone is not enough to guarantee consistency | |
2092 | * because a single value could represent different states | |
2093 | * (due to the wrap around). Thus a node has to check whether | |
2094 | * the resulting table (after applying the changes) is still | |
2095 | * consistent or not. E.g. a node could disconnect while its | |
2096 | * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case | |
2097 | * checking the CRC value is mandatory to detect the | |
2098 | * inconsistency */ | |
2099 | if (orig_node->tt_crc != tt_crc) | |
2100 | goto request_table; | |
2101 | ||
2102 | /* Roaming phase is over: tables are in sync again. I can | |
2103 | * unset the flag */ | |
2104 | orig_node->tt_poss_change = false; | |
2105 | } else { | |
2106 | /* if we missed more than one change or our tables are not | |
2107 | * in sync anymore -> request fresh tt data */ | |
db08e6e5 | 2108 | |
17071578 AQ |
2109 | if (!orig_node->tt_initialised || ttvn != orig_ttvn || |
2110 | orig_node->tt_crc != tt_crc) { | |
a943cac1 | 2111 | request_table: |
86ceb360 SE |
2112 | bat_dbg(DBG_TT, bat_priv, |
2113 | "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n", | |
2114 | orig_node->orig, ttvn, orig_ttvn, tt_crc, | |
2115 | orig_node->tt_crc, tt_num_changes); | |
a943cac1 ML |
2116 | send_tt_request(bat_priv, orig_node, ttvn, tt_crc, |
2117 | full_table); | |
2118 | return; | |
2119 | } | |
2120 | } | |
2121 | } | |
3275e7cc AQ |
2122 | |
2123 | /* returns true whether we know that the client has moved from its old | |
2124 | * originator to another one. This entry is kept is still kept for consistency | |
2125 | * purposes | |
2126 | */ | |
2127 | bool tt_global_client_is_roaming(struct bat_priv *bat_priv, uint8_t *addr) | |
2128 | { | |
2129 | struct tt_global_entry *tt_global_entry; | |
2130 | bool ret = false; | |
2131 | ||
2132 | tt_global_entry = tt_global_hash_find(bat_priv, addr); | |
2133 | if (!tt_global_entry) | |
2134 | goto out; | |
2135 | ||
2136 | ret = tt_global_entry->common.flags & TT_CLIENT_ROAM; | |
2137 | tt_global_entry_free_ref(tt_global_entry); | |
2138 | out: | |
2139 | return ret; | |
2140 | } |