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Commit | Line | Data |
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c6c8fea2 | 1 | /* |
567db7b0 | 2 | * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner, Simon Wunderlich | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "main.h" | |
23 | #include "translation-table.h" | |
24 | #include "soft-interface.h" | |
32ae9b22 | 25 | #include "hard-interface.h" |
a73105b8 | 26 | #include "send.h" |
c6c8fea2 SE |
27 | #include "hash.h" |
28 | #include "originator.h" | |
a73105b8 | 29 | #include "routing.h" |
c6c8fea2 | 30 | |
a73105b8 AQ |
31 | #include <linux/crc16.h> |
32 | ||
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 | ||
7683fdc1 AQ |
111 | static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry) |
112 | { | |
48100bac AQ |
113 | if (atomic_dec_and_test(&tt_local_entry->common.refcount)) |
114 | kfree_rcu(tt_local_entry, common.rcu); | |
7683fdc1 AQ |
115 | } |
116 | ||
531027fc SW |
117 | static void tt_global_entry_free_rcu(struct rcu_head *rcu) |
118 | { | |
48100bac | 119 | struct tt_common_entry *tt_common_entry; |
531027fc SW |
120 | struct tt_global_entry *tt_global_entry; |
121 | ||
48100bac AQ |
122 | tt_common_entry = container_of(rcu, struct tt_common_entry, rcu); |
123 | tt_global_entry = container_of(tt_common_entry, struct tt_global_entry, | |
124 | common); | |
531027fc SW |
125 | |
126 | if (tt_global_entry->orig_node) | |
127 | orig_node_free_ref(tt_global_entry->orig_node); | |
128 | ||
129 | kfree(tt_global_entry); | |
130 | } | |
131 | ||
7683fdc1 AQ |
132 | static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry) |
133 | { | |
48100bac AQ |
134 | if (atomic_dec_and_test(&tt_global_entry->common.refcount)) |
135 | call_rcu(&tt_global_entry->common.rcu, | |
136 | tt_global_entry_free_rcu); | |
7683fdc1 AQ |
137 | } |
138 | ||
ff66c975 AQ |
139 | static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr, |
140 | uint8_t flags) | |
a73105b8 AQ |
141 | { |
142 | struct tt_change_node *tt_change_node; | |
143 | ||
144 | tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC); | |
145 | ||
146 | if (!tt_change_node) | |
147 | return; | |
148 | ||
ff66c975 | 149 | tt_change_node->change.flags = flags; |
a73105b8 AQ |
150 | memcpy(tt_change_node->change.addr, addr, ETH_ALEN); |
151 | ||
152 | spin_lock_bh(&bat_priv->tt_changes_list_lock); | |
153 | /* track the change in the OGMinterval list */ | |
154 | list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list); | |
155 | atomic_inc(&bat_priv->tt_local_changes); | |
156 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); | |
157 | ||
158 | atomic_set(&bat_priv->tt_ogm_append_cnt, 0); | |
159 | } | |
160 | ||
161 | int tt_len(int changes_num) | |
162 | { | |
163 | return changes_num * sizeof(struct tt_change); | |
164 | } | |
165 | ||
166 | static int tt_local_init(struct bat_priv *bat_priv) | |
c6c8fea2 | 167 | { |
2dafb49d | 168 | if (bat_priv->tt_local_hash) |
c6c8fea2 SE |
169 | return 1; |
170 | ||
2dafb49d | 171 | bat_priv->tt_local_hash = hash_new(1024); |
c6c8fea2 | 172 | |
2dafb49d | 173 | if (!bat_priv->tt_local_hash) |
c6c8fea2 SE |
174 | return 0; |
175 | ||
c6c8fea2 SE |
176 | return 1; |
177 | } | |
178 | ||
bc279080 AQ |
179 | void tt_local_add(struct net_device *soft_iface, const uint8_t *addr, |
180 | int ifindex) | |
c6c8fea2 SE |
181 | { |
182 | struct bat_priv *bat_priv = netdev_priv(soft_iface); | |
7683fdc1 AQ |
183 | struct tt_local_entry *tt_local_entry = NULL; |
184 | struct tt_global_entry *tt_global_entry = NULL; | |
80b3f58c | 185 | int hash_added; |
c6c8fea2 | 186 | |
2dafb49d | 187 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
c6c8fea2 | 188 | |
2dafb49d AQ |
189 | if (tt_local_entry) { |
190 | tt_local_entry->last_seen = jiffies; | |
7683fdc1 | 191 | goto out; |
c6c8fea2 SE |
192 | } |
193 | ||
704509b8 | 194 | tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC); |
2dafb49d | 195 | if (!tt_local_entry) |
7683fdc1 | 196 | goto out; |
a73105b8 | 197 | |
a73105b8 AQ |
198 | bat_dbg(DBG_TT, bat_priv, |
199 | "Creating new local tt entry: %pM (ttvn: %d)\n", addr, | |
200 | (uint8_t)atomic_read(&bat_priv->ttvn)); | |
c6c8fea2 | 201 | |
48100bac AQ |
202 | memcpy(tt_local_entry->common.addr, addr, ETH_ALEN); |
203 | tt_local_entry->common.flags = NO_FLAGS; | |
bc279080 | 204 | if (is_wifi_iface(ifindex)) |
48100bac AQ |
205 | tt_local_entry->common.flags |= TT_CLIENT_WIFI; |
206 | atomic_set(&tt_local_entry->common.refcount, 2); | |
207 | tt_local_entry->last_seen = jiffies; | |
c6c8fea2 SE |
208 | |
209 | /* the batman interface mac address should never be purged */ | |
39901e71 | 210 | if (compare_eth(addr, soft_iface->dev_addr)) |
48100bac | 211 | tt_local_entry->common.flags |= TT_CLIENT_NOPURGE; |
c6c8fea2 | 212 | |
c40ed2bf AQ |
213 | /* The local entry has to be marked as NEW to avoid to send it in |
214 | * a full table response going out before the next ttvn increment | |
215 | * (consistency check) */ | |
216 | tt_local_entry->common.flags |= TT_CLIENT_NEW; | |
217 | ||
80b3f58c SW |
218 | hash_added = hash_add(bat_priv->tt_local_hash, compare_tt, choose_orig, |
219 | &tt_local_entry->common, | |
220 | &tt_local_entry->common.hash_entry); | |
221 | ||
222 | if (unlikely(hash_added != 0)) { | |
223 | /* remove the reference for the hash */ | |
224 | tt_local_entry_free_ref(tt_local_entry); | |
225 | goto out; | |
226 | } | |
227 | ||
48100bac | 228 | tt_local_event(bat_priv, addr, tt_local_entry->common.flags); |
ff66c975 | 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; | |
03fc3070 | 237 | /* The global entry has to be marked as ROAMING and has to be |
980d55b2 | 238 | * kept for consistency purpose */ |
220b07e9 | 239 | tt_global_entry->common.flags |= TT_CLIENT_ROAM; |
03fc3070 | 240 | tt_global_entry->roam_at = jiffies; |
48100bac | 241 | send_roam_adv(bat_priv, tt_global_entry->common.addr, |
7683fdc1 AQ |
242 | tt_global_entry->orig_node); |
243 | } | |
244 | out: | |
245 | if (tt_local_entry) | |
246 | tt_local_entry_free_ref(tt_local_entry); | |
247 | if (tt_global_entry) | |
248 | tt_global_entry_free_ref(tt_global_entry); | |
c6c8fea2 SE |
249 | } |
250 | ||
a73105b8 AQ |
251 | int tt_changes_fill_buffer(struct bat_priv *bat_priv, |
252 | unsigned char *buff, int buff_len) | |
c6c8fea2 | 253 | { |
a73105b8 AQ |
254 | int count = 0, tot_changes = 0; |
255 | struct tt_change_node *entry, *safe; | |
c6c8fea2 | 256 | |
a73105b8 AQ |
257 | if (buff_len > 0) |
258 | tot_changes = buff_len / tt_len(1); | |
c6c8fea2 | 259 | |
a73105b8 AQ |
260 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
261 | atomic_set(&bat_priv->tt_local_changes, 0); | |
c6c8fea2 | 262 | |
a73105b8 AQ |
263 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
264 | list) { | |
265 | if (count < tot_changes) { | |
266 | memcpy(buff + tt_len(count), | |
267 | &entry->change, sizeof(struct tt_change)); | |
c6c8fea2 SE |
268 | count++; |
269 | } | |
a73105b8 AQ |
270 | list_del(&entry->list); |
271 | kfree(entry); | |
c6c8fea2 | 272 | } |
a73105b8 AQ |
273 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); |
274 | ||
275 | /* Keep the buffer for possible tt_request */ | |
276 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
277 | kfree(bat_priv->tt_buff); | |
278 | bat_priv->tt_buff_len = 0; | |
279 | bat_priv->tt_buff = NULL; | |
280 | /* We check whether this new OGM has no changes due to size | |
281 | * problems */ | |
282 | if (buff_len > 0) { | |
283 | /** | |
284 | * if kmalloc() fails we will reply with the full table | |
285 | * instead of providing the diff | |
286 | */ | |
287 | bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC); | |
288 | if (bat_priv->tt_buff) { | |
289 | memcpy(bat_priv->tt_buff, buff, buff_len); | |
290 | bat_priv->tt_buff_len = buff_len; | |
291 | } | |
292 | } | |
293 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
c6c8fea2 | 294 | |
a73105b8 | 295 | return tot_changes; |
c6c8fea2 SE |
296 | } |
297 | ||
2dafb49d | 298 | int tt_local_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
299 | { |
300 | struct net_device *net_dev = (struct net_device *)seq->private; | |
301 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
2dafb49d | 302 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
48100bac | 303 | struct tt_common_entry *tt_common_entry; |
32ae9b22 | 304 | struct hard_iface *primary_if; |
7aadf889 | 305 | struct hlist_node *node; |
c6c8fea2 | 306 | struct hlist_head *head; |
c90681b8 AQ |
307 | uint32_t i; |
308 | int ret = 0; | |
32ae9b22 ML |
309 | |
310 | primary_if = primary_if_get_selected(bat_priv); | |
311 | if (!primary_if) { | |
312 | ret = seq_printf(seq, "BATMAN mesh %s disabled - " | |
313 | "please specify interfaces to enable it\n", | |
314 | net_dev->name); | |
315 | goto out; | |
316 | } | |
c6c8fea2 | 317 | |
32ae9b22 ML |
318 | if (primary_if->if_status != IF_ACTIVE) { |
319 | ret = seq_printf(seq, "BATMAN mesh %s disabled - " | |
320 | "primary interface not active\n", | |
321 | net_dev->name); | |
322 | goto out; | |
c6c8fea2 SE |
323 | } |
324 | ||
325 | seq_printf(seq, "Locally retrieved addresses (from %s) " | |
a73105b8 AQ |
326 | "announced via TT (TTVN: %u):\n", |
327 | net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn)); | |
c6c8fea2 | 328 | |
c6c8fea2 SE |
329 | for (i = 0; i < hash->size; i++) { |
330 | head = &hash->table[i]; | |
331 | ||
7aadf889 | 332 | rcu_read_lock(); |
48100bac | 333 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 334 | head, hash_entry) { |
d099c2c5 | 335 | seq_printf(seq, " * %pM [%c%c%c%c%c]\n", |
48100bac AQ |
336 | tt_common_entry->addr, |
337 | (tt_common_entry->flags & | |
df6edb9e | 338 | TT_CLIENT_ROAM ? 'R' : '.'), |
48100bac | 339 | (tt_common_entry->flags & |
df6edb9e | 340 | TT_CLIENT_NOPURGE ? 'P' : '.'), |
48100bac | 341 | (tt_common_entry->flags & |
df6edb9e | 342 | TT_CLIENT_NEW ? 'N' : '.'), |
48100bac | 343 | (tt_common_entry->flags & |
df6edb9e | 344 | TT_CLIENT_PENDING ? 'X' : '.'), |
48100bac | 345 | (tt_common_entry->flags & |
df6edb9e | 346 | TT_CLIENT_WIFI ? 'W' : '.')); |
c6c8fea2 | 347 | } |
7aadf889 | 348 | rcu_read_unlock(); |
c6c8fea2 | 349 | } |
32ae9b22 ML |
350 | out: |
351 | if (primary_if) | |
352 | hardif_free_ref(primary_if); | |
353 | return ret; | |
c6c8fea2 SE |
354 | } |
355 | ||
058d0e26 AQ |
356 | static void tt_local_set_pending(struct bat_priv *bat_priv, |
357 | struct tt_local_entry *tt_local_entry, | |
c566dbbe | 358 | uint16_t flags, const char *message) |
c6c8fea2 | 359 | { |
48100bac AQ |
360 | tt_local_event(bat_priv, tt_local_entry->common.addr, |
361 | tt_local_entry->common.flags | flags); | |
a73105b8 | 362 | |
015758d0 AQ |
363 | /* The local client has to be marked as "pending to be removed" but has |
364 | * to be kept in the table in order to send it in a full table | |
058d0e26 | 365 | * response issued before the net ttvn increment (consistency check) */ |
48100bac | 366 | tt_local_entry->common.flags |= TT_CLIENT_PENDING; |
c566dbbe AQ |
367 | |
368 | bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) pending to be removed: " | |
369 | "%s\n", tt_local_entry->common.addr, message); | |
c6c8fea2 SE |
370 | } |
371 | ||
a73105b8 | 372 | void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr, |
cc47f66e | 373 | const char *message, bool roaming) |
c6c8fea2 | 374 | { |
7683fdc1 | 375 | struct tt_local_entry *tt_local_entry = NULL; |
c6c8fea2 | 376 | |
2dafb49d | 377 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
378 | if (!tt_local_entry) |
379 | goto out; | |
380 | ||
058d0e26 | 381 | tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL | |
c566dbbe | 382 | (roaming ? TT_CLIENT_ROAM : NO_FLAGS), message); |
7683fdc1 AQ |
383 | out: |
384 | if (tt_local_entry) | |
385 | tt_local_entry_free_ref(tt_local_entry); | |
c6c8fea2 SE |
386 | } |
387 | ||
a73105b8 | 388 | static void tt_local_purge(struct bat_priv *bat_priv) |
c6c8fea2 | 389 | { |
2dafb49d AQ |
390 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
391 | struct tt_local_entry *tt_local_entry; | |
48100bac | 392 | struct tt_common_entry *tt_common_entry; |
7aadf889 | 393 | struct hlist_node *node, *node_tmp; |
c6c8fea2 | 394 | struct hlist_head *head; |
7683fdc1 | 395 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 396 | uint32_t i; |
c6c8fea2 | 397 | |
c6c8fea2 SE |
398 | for (i = 0; i < hash->size; i++) { |
399 | head = &hash->table[i]; | |
7683fdc1 | 400 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 401 | |
7683fdc1 | 402 | spin_lock_bh(list_lock); |
48100bac | 403 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
7aadf889 | 404 | head, hash_entry) { |
48100bac AQ |
405 | tt_local_entry = container_of(tt_common_entry, |
406 | struct tt_local_entry, | |
407 | common); | |
408 | if (tt_local_entry->common.flags & TT_CLIENT_NOPURGE) | |
7aadf889 | 409 | continue; |
c6c8fea2 | 410 | |
058d0e26 | 411 | /* entry already marked for deletion */ |
48100bac | 412 | if (tt_local_entry->common.flags & TT_CLIENT_PENDING) |
058d0e26 AQ |
413 | continue; |
414 | ||
a04ccd59 | 415 | if (!has_timed_out(tt_local_entry->last_seen, |
032b7969 | 416 | TT_LOCAL_TIMEOUT)) |
7aadf889 ML |
417 | continue; |
418 | ||
058d0e26 | 419 | tt_local_set_pending(bat_priv, tt_local_entry, |
c566dbbe | 420 | TT_CLIENT_DEL, "timed out"); |
c6c8fea2 | 421 | } |
7683fdc1 | 422 | spin_unlock_bh(list_lock); |
c6c8fea2 SE |
423 | } |
424 | ||
c6c8fea2 SE |
425 | } |
426 | ||
a73105b8 | 427 | static void tt_local_table_free(struct bat_priv *bat_priv) |
c6c8fea2 | 428 | { |
a73105b8 | 429 | struct hashtable_t *hash; |
a73105b8 | 430 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
48100bac | 431 | struct tt_common_entry *tt_common_entry; |
a73105b8 | 432 | struct tt_local_entry *tt_local_entry; |
7683fdc1 AQ |
433 | struct hlist_node *node, *node_tmp; |
434 | struct hlist_head *head; | |
c90681b8 | 435 | uint32_t i; |
a73105b8 | 436 | |
2dafb49d | 437 | if (!bat_priv->tt_local_hash) |
c6c8fea2 SE |
438 | return; |
439 | ||
a73105b8 AQ |
440 | hash = bat_priv->tt_local_hash; |
441 | ||
442 | for (i = 0; i < hash->size; i++) { | |
443 | head = &hash->table[i]; | |
444 | list_lock = &hash->list_locks[i]; | |
445 | ||
446 | spin_lock_bh(list_lock); | |
48100bac | 447 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
a73105b8 AQ |
448 | head, hash_entry) { |
449 | hlist_del_rcu(node); | |
48100bac AQ |
450 | tt_local_entry = container_of(tt_common_entry, |
451 | struct tt_local_entry, | |
452 | common); | |
7683fdc1 | 453 | tt_local_entry_free_ref(tt_local_entry); |
a73105b8 AQ |
454 | } |
455 | spin_unlock_bh(list_lock); | |
456 | } | |
457 | ||
458 | hash_destroy(hash); | |
459 | ||
2dafb49d | 460 | bat_priv->tt_local_hash = NULL; |
c6c8fea2 SE |
461 | } |
462 | ||
a73105b8 | 463 | static int tt_global_init(struct bat_priv *bat_priv) |
c6c8fea2 | 464 | { |
2dafb49d | 465 | if (bat_priv->tt_global_hash) |
c6c8fea2 SE |
466 | return 1; |
467 | ||
2dafb49d | 468 | bat_priv->tt_global_hash = hash_new(1024); |
c6c8fea2 | 469 | |
2dafb49d | 470 | if (!bat_priv->tt_global_hash) |
c6c8fea2 SE |
471 | return 0; |
472 | ||
473 | return 1; | |
474 | } | |
475 | ||
a73105b8 | 476 | static void tt_changes_list_free(struct bat_priv *bat_priv) |
c6c8fea2 | 477 | { |
a73105b8 | 478 | struct tt_change_node *entry, *safe; |
c6c8fea2 | 479 | |
a73105b8 | 480 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
c6c8fea2 | 481 | |
a73105b8 AQ |
482 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
483 | list) { | |
484 | list_del(&entry->list); | |
485 | kfree(entry); | |
486 | } | |
c6c8fea2 | 487 | |
a73105b8 AQ |
488 | atomic_set(&bat_priv->tt_local_changes, 0); |
489 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); | |
490 | } | |
c6c8fea2 | 491 | |
a73105b8 AQ |
492 | /* caller must hold orig_node refcount */ |
493 | int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
bc279080 AQ |
494 | const unsigned char *tt_addr, uint8_t ttvn, bool roaming, |
495 | bool wifi) | |
a73105b8 AQ |
496 | { |
497 | struct tt_global_entry *tt_global_entry; | |
a73105b8 | 498 | struct orig_node *orig_node_tmp; |
7683fdc1 | 499 | int ret = 0; |
80b3f58c | 500 | int hash_added; |
c6c8fea2 | 501 | |
a73105b8 AQ |
502 | tt_global_entry = tt_global_hash_find(bat_priv, tt_addr); |
503 | ||
504 | if (!tt_global_entry) { | |
505 | tt_global_entry = | |
506 | kmalloc(sizeof(*tt_global_entry), | |
507 | GFP_ATOMIC); | |
508 | if (!tt_global_entry) | |
7683fdc1 AQ |
509 | goto out; |
510 | ||
48100bac AQ |
511 | memcpy(tt_global_entry->common.addr, tt_addr, ETH_ALEN); |
512 | tt_global_entry->common.flags = NO_FLAGS; | |
513 | atomic_set(&tt_global_entry->common.refcount, 2); | |
a73105b8 AQ |
514 | /* Assign the new orig_node */ |
515 | atomic_inc(&orig_node->refcount); | |
2dafb49d | 516 | tt_global_entry->orig_node = orig_node; |
a73105b8 | 517 | tt_global_entry->ttvn = ttvn; |
cc47f66e | 518 | tt_global_entry->roam_at = 0; |
7683fdc1 | 519 | |
80b3f58c SW |
520 | hash_added = hash_add(bat_priv->tt_global_hash, compare_tt, |
521 | choose_orig, &tt_global_entry->common, | |
522 | &tt_global_entry->common.hash_entry); | |
523 | ||
524 | if (unlikely(hash_added != 0)) { | |
525 | /* remove the reference for the hash */ | |
526 | tt_global_entry_free_ref(tt_global_entry); | |
527 | goto out_remove; | |
528 | } | |
7683fdc1 | 529 | atomic_inc(&orig_node->tt_size); |
a73105b8 AQ |
530 | } else { |
531 | if (tt_global_entry->orig_node != orig_node) { | |
532 | atomic_dec(&tt_global_entry->orig_node->tt_size); | |
533 | orig_node_tmp = tt_global_entry->orig_node; | |
534 | atomic_inc(&orig_node->refcount); | |
535 | tt_global_entry->orig_node = orig_node; | |
a73105b8 AQ |
536 | orig_node_free_ref(orig_node_tmp); |
537 | atomic_inc(&orig_node->tt_size); | |
538 | } | |
48100bac | 539 | tt_global_entry->common.flags = NO_FLAGS; |
cc47f66e | 540 | tt_global_entry->ttvn = ttvn; |
cc47f66e | 541 | tt_global_entry->roam_at = 0; |
a73105b8 | 542 | } |
c6c8fea2 | 543 | |
bc279080 | 544 | if (wifi) |
48100bac | 545 | tt_global_entry->common.flags |= TT_CLIENT_WIFI; |
bc279080 | 546 | |
a73105b8 AQ |
547 | bat_dbg(DBG_TT, bat_priv, |
548 | "Creating new global tt entry: %pM (via %pM)\n", | |
48100bac | 549 | tt_global_entry->common.addr, orig_node->orig); |
c6c8fea2 | 550 | |
80b3f58c | 551 | out_remove: |
a73105b8 | 552 | /* remove address from local hash if present */ |
48100bac | 553 | tt_local_remove(bat_priv, tt_global_entry->common.addr, |
7683fdc1 AQ |
554 | "global tt received", roaming); |
555 | ret = 1; | |
556 | out: | |
557 | if (tt_global_entry) | |
558 | tt_global_entry_free_ref(tt_global_entry); | |
559 | return ret; | |
c6c8fea2 SE |
560 | } |
561 | ||
2dafb49d | 562 | int tt_global_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
563 | { |
564 | struct net_device *net_dev = (struct net_device *)seq->private; | |
565 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
2dafb49d | 566 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
48100bac | 567 | struct tt_common_entry *tt_common_entry; |
2dafb49d | 568 | struct tt_global_entry *tt_global_entry; |
32ae9b22 | 569 | struct hard_iface *primary_if; |
7aadf889 | 570 | struct hlist_node *node; |
c6c8fea2 | 571 | struct hlist_head *head; |
c90681b8 AQ |
572 | uint32_t i; |
573 | int ret = 0; | |
32ae9b22 ML |
574 | |
575 | primary_if = primary_if_get_selected(bat_priv); | |
576 | if (!primary_if) { | |
577 | ret = seq_printf(seq, "BATMAN mesh %s disabled - please " | |
578 | "specify interfaces to enable it\n", | |
579 | net_dev->name); | |
580 | goto out; | |
581 | } | |
c6c8fea2 | 582 | |
32ae9b22 ML |
583 | if (primary_if->if_status != IF_ACTIVE) { |
584 | ret = seq_printf(seq, "BATMAN mesh %s disabled - " | |
585 | "primary interface not active\n", | |
586 | net_dev->name); | |
587 | goto out; | |
c6c8fea2 SE |
588 | } |
589 | ||
2dafb49d AQ |
590 | seq_printf(seq, |
591 | "Globally announced TT entries received via the mesh %s\n", | |
c6c8fea2 | 592 | net_dev->name); |
df6edb9e AQ |
593 | seq_printf(seq, " %-13s %s %-15s %s %s\n", |
594 | "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags"); | |
c6c8fea2 | 595 | |
c6c8fea2 SE |
596 | for (i = 0; i < hash->size; i++) { |
597 | head = &hash->table[i]; | |
598 | ||
7aadf889 | 599 | rcu_read_lock(); |
48100bac | 600 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 601 | head, hash_entry) { |
48100bac AQ |
602 | tt_global_entry = container_of(tt_common_entry, |
603 | struct tt_global_entry, | |
604 | common); | |
d099c2c5 | 605 | seq_printf(seq, " * %pM (%3u) via %pM (%3u) " |
78d6942a | 606 | "[%c%c]\n", |
48100bac | 607 | tt_global_entry->common.addr, |
a73105b8 AQ |
608 | tt_global_entry->ttvn, |
609 | tt_global_entry->orig_node->orig, | |
610 | (uint8_t) atomic_read( | |
611 | &tt_global_entry->orig_node-> | |
df6edb9e | 612 | last_ttvn), |
48100bac | 613 | (tt_global_entry->common.flags & |
df6edb9e | 614 | TT_CLIENT_ROAM ? 'R' : '.'), |
48100bac | 615 | (tt_global_entry->common.flags & |
df6edb9e | 616 | TT_CLIENT_WIFI ? 'W' : '.')); |
c6c8fea2 | 617 | } |
7aadf889 | 618 | rcu_read_unlock(); |
c6c8fea2 | 619 | } |
32ae9b22 ML |
620 | out: |
621 | if (primary_if) | |
622 | hardif_free_ref(primary_if); | |
623 | return ret; | |
c6c8fea2 SE |
624 | } |
625 | ||
a73105b8 AQ |
626 | static void _tt_global_del(struct bat_priv *bat_priv, |
627 | struct tt_global_entry *tt_global_entry, | |
628 | const char *message) | |
c6c8fea2 | 629 | { |
a73105b8 | 630 | if (!tt_global_entry) |
7683fdc1 | 631 | goto out; |
a73105b8 AQ |
632 | |
633 | bat_dbg(DBG_TT, bat_priv, | |
2dafb49d | 634 | "Deleting global tt entry %pM (via %pM): %s\n", |
48100bac | 635 | tt_global_entry->common.addr, tt_global_entry->orig_node->orig, |
c6c8fea2 SE |
636 | message); |
637 | ||
a73105b8 | 638 | atomic_dec(&tt_global_entry->orig_node->tt_size); |
7683fdc1 | 639 | |
48100bac AQ |
640 | hash_remove(bat_priv->tt_global_hash, compare_tt, choose_orig, |
641 | tt_global_entry->common.addr); | |
7683fdc1 AQ |
642 | out: |
643 | if (tt_global_entry) | |
644 | tt_global_entry_free_ref(tt_global_entry); | |
c6c8fea2 SE |
645 | } |
646 | ||
a73105b8 AQ |
647 | void tt_global_del(struct bat_priv *bat_priv, |
648 | struct orig_node *orig_node, const unsigned char *addr, | |
cc47f66e | 649 | const char *message, bool roaming) |
a73105b8 | 650 | { |
7683fdc1 | 651 | struct tt_global_entry *tt_global_entry = NULL; |
797399b4 | 652 | struct tt_local_entry *tt_local_entry = NULL; |
a73105b8 | 653 | |
a73105b8 | 654 | tt_global_entry = tt_global_hash_find(bat_priv, addr); |
92f90f56 | 655 | if (!tt_global_entry || tt_global_entry->orig_node != orig_node) |
7683fdc1 | 656 | goto out; |
a73105b8 | 657 | |
92f90f56 SE |
658 | if (!roaming) |
659 | goto out_del; | |
660 | ||
661 | /* if we are deleting a global entry due to a roam | |
662 | * event, there are two possibilities: | |
663 | * 1) the client roamed from node A to node B => we mark | |
664 | * it with TT_CLIENT_ROAM, we start a timer and we | |
665 | * wait for node B to claim it. In case of timeout | |
666 | * the entry is purged. | |
667 | * 2) the client roamed to us => we can directly delete | |
668 | * the global entry, since it is useless now. */ | |
669 | tt_local_entry = tt_local_hash_find(bat_priv, | |
670 | tt_global_entry->common.addr); | |
671 | if (!tt_local_entry) { | |
672 | tt_global_entry->common.flags |= TT_CLIENT_ROAM; | |
673 | tt_global_entry->roam_at = jiffies; | |
674 | goto out; | |
a73105b8 | 675 | } |
92f90f56 SE |
676 | |
677 | out_del: | |
678 | _tt_global_del(bat_priv, tt_global_entry, message); | |
679 | ||
cc47f66e | 680 | out: |
7683fdc1 AQ |
681 | if (tt_global_entry) |
682 | tt_global_entry_free_ref(tt_global_entry); | |
797399b4 AQ |
683 | if (tt_local_entry) |
684 | tt_local_entry_free_ref(tt_local_entry); | |
a73105b8 AQ |
685 | } |
686 | ||
2dafb49d | 687 | void tt_global_del_orig(struct bat_priv *bat_priv, |
a73105b8 | 688 | struct orig_node *orig_node, const char *message) |
c6c8fea2 | 689 | { |
2dafb49d | 690 | struct tt_global_entry *tt_global_entry; |
48100bac | 691 | struct tt_common_entry *tt_common_entry; |
c90681b8 | 692 | uint32_t i; |
a73105b8 AQ |
693 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
694 | struct hlist_node *node, *safe; | |
695 | struct hlist_head *head; | |
7683fdc1 | 696 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c6c8fea2 | 697 | |
6e801494 SW |
698 | if (!hash) |
699 | return; | |
700 | ||
a73105b8 AQ |
701 | for (i = 0; i < hash->size; i++) { |
702 | head = &hash->table[i]; | |
7683fdc1 | 703 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 704 | |
7683fdc1 | 705 | spin_lock_bh(list_lock); |
48100bac | 706 | hlist_for_each_entry_safe(tt_common_entry, node, safe, |
a73105b8 | 707 | head, hash_entry) { |
48100bac AQ |
708 | tt_global_entry = container_of(tt_common_entry, |
709 | struct tt_global_entry, | |
710 | common); | |
7683fdc1 AQ |
711 | if (tt_global_entry->orig_node == orig_node) { |
712 | bat_dbg(DBG_TT, bat_priv, | |
713 | "Deleting global tt entry %pM " | |
87944973 | 714 | "(via %pM): %s\n", |
48100bac | 715 | tt_global_entry->common.addr, |
87944973 AQ |
716 | tt_global_entry->orig_node->orig, |
717 | message); | |
7683fdc1 AQ |
718 | hlist_del_rcu(node); |
719 | tt_global_entry_free_ref(tt_global_entry); | |
720 | } | |
a73105b8 | 721 | } |
7683fdc1 | 722 | spin_unlock_bh(list_lock); |
c6c8fea2 | 723 | } |
a73105b8 | 724 | atomic_set(&orig_node->tt_size, 0); |
17071578 | 725 | orig_node->tt_initialised = false; |
c6c8fea2 SE |
726 | } |
727 | ||
cc47f66e AQ |
728 | static void tt_global_roam_purge(struct bat_priv *bat_priv) |
729 | { | |
730 | struct hashtable_t *hash = bat_priv->tt_global_hash; | |
48100bac | 731 | struct tt_common_entry *tt_common_entry; |
cc47f66e AQ |
732 | struct tt_global_entry *tt_global_entry; |
733 | struct hlist_node *node, *node_tmp; | |
734 | struct hlist_head *head; | |
7683fdc1 | 735 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 736 | uint32_t i; |
cc47f66e | 737 | |
cc47f66e AQ |
738 | for (i = 0; i < hash->size; i++) { |
739 | head = &hash->table[i]; | |
7683fdc1 | 740 | list_lock = &hash->list_locks[i]; |
cc47f66e | 741 | |
7683fdc1 | 742 | spin_lock_bh(list_lock); |
48100bac | 743 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
cc47f66e | 744 | head, hash_entry) { |
48100bac AQ |
745 | tt_global_entry = container_of(tt_common_entry, |
746 | struct tt_global_entry, | |
747 | common); | |
748 | if (!(tt_global_entry->common.flags & TT_CLIENT_ROAM)) | |
cc47f66e | 749 | continue; |
a04ccd59 | 750 | if (!has_timed_out(tt_global_entry->roam_at, |
032b7969 | 751 | TT_CLIENT_ROAM_TIMEOUT)) |
cc47f66e AQ |
752 | continue; |
753 | ||
7683fdc1 AQ |
754 | bat_dbg(DBG_TT, bat_priv, "Deleting global " |
755 | "tt entry (%pM): Roaming timeout\n", | |
48100bac | 756 | tt_global_entry->common.addr); |
7683fdc1 AQ |
757 | atomic_dec(&tt_global_entry->orig_node->tt_size); |
758 | hlist_del_rcu(node); | |
759 | tt_global_entry_free_ref(tt_global_entry); | |
cc47f66e | 760 | } |
7683fdc1 | 761 | spin_unlock_bh(list_lock); |
cc47f66e AQ |
762 | } |
763 | ||
cc47f66e AQ |
764 | } |
765 | ||
a73105b8 | 766 | static void tt_global_table_free(struct bat_priv *bat_priv) |
c6c8fea2 | 767 | { |
7683fdc1 AQ |
768 | struct hashtable_t *hash; |
769 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
48100bac | 770 | struct tt_common_entry *tt_common_entry; |
7683fdc1 AQ |
771 | struct tt_global_entry *tt_global_entry; |
772 | struct hlist_node *node, *node_tmp; | |
773 | struct hlist_head *head; | |
c90681b8 | 774 | uint32_t i; |
7683fdc1 | 775 | |
2dafb49d | 776 | if (!bat_priv->tt_global_hash) |
c6c8fea2 SE |
777 | return; |
778 | ||
7683fdc1 AQ |
779 | hash = bat_priv->tt_global_hash; |
780 | ||
781 | for (i = 0; i < hash->size; i++) { | |
782 | head = &hash->table[i]; | |
783 | list_lock = &hash->list_locks[i]; | |
784 | ||
785 | spin_lock_bh(list_lock); | |
48100bac | 786 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
7683fdc1 AQ |
787 | head, hash_entry) { |
788 | hlist_del_rcu(node); | |
48100bac AQ |
789 | tt_global_entry = container_of(tt_common_entry, |
790 | struct tt_global_entry, | |
791 | common); | |
7683fdc1 AQ |
792 | tt_global_entry_free_ref(tt_global_entry); |
793 | } | |
794 | spin_unlock_bh(list_lock); | |
795 | } | |
796 | ||
797 | hash_destroy(hash); | |
798 | ||
2dafb49d | 799 | bat_priv->tt_global_hash = NULL; |
c6c8fea2 SE |
800 | } |
801 | ||
59b699cd AQ |
802 | static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry, |
803 | struct tt_global_entry *tt_global_entry) | |
804 | { | |
805 | bool ret = false; | |
806 | ||
48100bac AQ |
807 | if (tt_local_entry->common.flags & TT_CLIENT_WIFI && |
808 | tt_global_entry->common.flags & TT_CLIENT_WIFI) | |
59b699cd AQ |
809 | ret = true; |
810 | ||
811 | return ret; | |
812 | } | |
813 | ||
747e4221 | 814 | struct orig_node *transtable_search(struct bat_priv *bat_priv, |
3d393e47 | 815 | const uint8_t *src, const uint8_t *addr) |
c6c8fea2 | 816 | { |
3d393e47 AQ |
817 | struct tt_local_entry *tt_local_entry = NULL; |
818 | struct tt_global_entry *tt_global_entry = NULL; | |
7b36e8ee | 819 | struct orig_node *orig_node = NULL; |
c6c8fea2 | 820 | |
3d393e47 AQ |
821 | if (src && atomic_read(&bat_priv->ap_isolation)) { |
822 | tt_local_entry = tt_local_hash_find(bat_priv, src); | |
823 | if (!tt_local_entry) | |
824 | goto out; | |
825 | } | |
7aadf889 | 826 | |
3d393e47 | 827 | tt_global_entry = tt_global_hash_find(bat_priv, addr); |
2dafb49d | 828 | if (!tt_global_entry) |
7b36e8ee | 829 | goto out; |
7aadf889 | 830 | |
3d393e47 AQ |
831 | /* check whether the clients should not communicate due to AP |
832 | * isolation */ | |
833 | if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry)) | |
834 | goto out; | |
835 | ||
2dafb49d | 836 | if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount)) |
3d393e47 | 837 | goto out; |
c6c8fea2 | 838 | |
2dafb49d | 839 | orig_node = tt_global_entry->orig_node; |
c6c8fea2 | 840 | |
7b36e8ee | 841 | out: |
3d393e47 AQ |
842 | if (tt_global_entry) |
843 | tt_global_entry_free_ref(tt_global_entry); | |
844 | if (tt_local_entry) | |
845 | tt_local_entry_free_ref(tt_local_entry); | |
846 | ||
7b36e8ee | 847 | return orig_node; |
c6c8fea2 | 848 | } |
a73105b8 AQ |
849 | |
850 | /* Calculates the checksum of the local table of a given orig_node */ | |
851 | uint16_t tt_global_crc(struct bat_priv *bat_priv, struct orig_node *orig_node) | |
852 | { | |
853 | uint16_t total = 0, total_one; | |
854 | struct hashtable_t *hash = bat_priv->tt_global_hash; | |
48100bac | 855 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
856 | struct tt_global_entry *tt_global_entry; |
857 | struct hlist_node *node; | |
858 | struct hlist_head *head; | |
c90681b8 AQ |
859 | uint32_t i; |
860 | int j; | |
a73105b8 AQ |
861 | |
862 | for (i = 0; i < hash->size; i++) { | |
863 | head = &hash->table[i]; | |
864 | ||
865 | rcu_read_lock(); | |
48100bac | 866 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 | 867 | head, hash_entry) { |
48100bac AQ |
868 | tt_global_entry = container_of(tt_common_entry, |
869 | struct tt_global_entry, | |
870 | common); | |
a73105b8 AQ |
871 | if (compare_eth(tt_global_entry->orig_node, |
872 | orig_node)) { | |
cc47f66e AQ |
873 | /* Roaming clients are in the global table for |
874 | * consistency only. They don't have to be | |
875 | * taken into account while computing the | |
876 | * global crc */ | |
48100bac | 877 | if (tt_common_entry->flags & TT_CLIENT_ROAM) |
cc47f66e | 878 | continue; |
a73105b8 AQ |
879 | total_one = 0; |
880 | for (j = 0; j < ETH_ALEN; j++) | |
881 | total_one = crc16_byte(total_one, | |
48100bac | 882 | tt_common_entry->addr[j]); |
a73105b8 AQ |
883 | total ^= total_one; |
884 | } | |
885 | } | |
886 | rcu_read_unlock(); | |
887 | } | |
888 | ||
889 | return total; | |
890 | } | |
891 | ||
892 | /* Calculates the checksum of the local table */ | |
893 | uint16_t tt_local_crc(struct bat_priv *bat_priv) | |
894 | { | |
895 | uint16_t total = 0, total_one; | |
896 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
48100bac | 897 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
898 | struct hlist_node *node; |
899 | struct hlist_head *head; | |
c90681b8 AQ |
900 | uint32_t i; |
901 | int j; | |
a73105b8 AQ |
902 | |
903 | for (i = 0; i < hash->size; i++) { | |
904 | head = &hash->table[i]; | |
905 | ||
906 | rcu_read_lock(); | |
48100bac | 907 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 | 908 | head, hash_entry) { |
058d0e26 AQ |
909 | /* not yet committed clients have not to be taken into |
910 | * account while computing the CRC */ | |
48100bac | 911 | if (tt_common_entry->flags & TT_CLIENT_NEW) |
058d0e26 | 912 | continue; |
a73105b8 AQ |
913 | total_one = 0; |
914 | for (j = 0; j < ETH_ALEN; j++) | |
915 | total_one = crc16_byte(total_one, | |
48100bac | 916 | tt_common_entry->addr[j]); |
a73105b8 AQ |
917 | total ^= total_one; |
918 | } | |
a73105b8 AQ |
919 | rcu_read_unlock(); |
920 | } | |
921 | ||
922 | return total; | |
923 | } | |
924 | ||
925 | static void tt_req_list_free(struct bat_priv *bat_priv) | |
926 | { | |
927 | struct tt_req_node *node, *safe; | |
928 | ||
929 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
930 | ||
931 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
932 | list_del(&node->list); | |
933 | kfree(node); | |
934 | } | |
935 | ||
936 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
937 | } | |
938 | ||
939 | void tt_save_orig_buffer(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
940 | const unsigned char *tt_buff, uint8_t tt_num_changes) | |
941 | { | |
942 | uint16_t tt_buff_len = tt_len(tt_num_changes); | |
943 | ||
944 | /* Replace the old buffer only if I received something in the | |
945 | * last OGM (the OGM could carry no changes) */ | |
946 | spin_lock_bh(&orig_node->tt_buff_lock); | |
947 | if (tt_buff_len > 0) { | |
948 | kfree(orig_node->tt_buff); | |
949 | orig_node->tt_buff_len = 0; | |
950 | orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); | |
951 | if (orig_node->tt_buff) { | |
952 | memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); | |
953 | orig_node->tt_buff_len = tt_buff_len; | |
954 | } | |
955 | } | |
956 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
957 | } | |
958 | ||
959 | static void tt_req_purge(struct bat_priv *bat_priv) | |
960 | { | |
961 | struct tt_req_node *node, *safe; | |
962 | ||
963 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
964 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
032b7969 | 965 | if (has_timed_out(node->issued_at, TT_REQUEST_TIMEOUT)) { |
a73105b8 AQ |
966 | list_del(&node->list); |
967 | kfree(node); | |
968 | } | |
969 | } | |
970 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
971 | } | |
972 | ||
973 | /* returns the pointer to the new tt_req_node struct if no request | |
974 | * has already been issued for this orig_node, NULL otherwise */ | |
975 | static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv, | |
976 | struct orig_node *orig_node) | |
977 | { | |
978 | struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; | |
979 | ||
980 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
981 | list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) { | |
982 | if (compare_eth(tt_req_node_tmp, orig_node) && | |
a04ccd59 | 983 | !has_timed_out(tt_req_node_tmp->issued_at, |
032b7969 | 984 | TT_REQUEST_TIMEOUT)) |
a73105b8 AQ |
985 | goto unlock; |
986 | } | |
987 | ||
988 | tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); | |
989 | if (!tt_req_node) | |
990 | goto unlock; | |
991 | ||
992 | memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); | |
993 | tt_req_node->issued_at = jiffies; | |
994 | ||
995 | list_add(&tt_req_node->list, &bat_priv->tt_req_list); | |
996 | unlock: | |
997 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
998 | return tt_req_node; | |
999 | } | |
1000 | ||
058d0e26 AQ |
1001 | /* data_ptr is useless here, but has to be kept to respect the prototype */ |
1002 | static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr) | |
1003 | { | |
48100bac | 1004 | const struct tt_common_entry *tt_common_entry = entry_ptr; |
058d0e26 | 1005 | |
48100bac | 1006 | if (tt_common_entry->flags & TT_CLIENT_NEW) |
058d0e26 AQ |
1007 | return 0; |
1008 | return 1; | |
1009 | } | |
1010 | ||
a73105b8 AQ |
1011 | static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr) |
1012 | { | |
48100bac AQ |
1013 | const struct tt_common_entry *tt_common_entry = entry_ptr; |
1014 | const struct tt_global_entry *tt_global_entry; | |
a73105b8 AQ |
1015 | const struct orig_node *orig_node = data_ptr; |
1016 | ||
48100bac | 1017 | if (tt_common_entry->flags & TT_CLIENT_ROAM) |
cc47f66e AQ |
1018 | return 0; |
1019 | ||
48100bac AQ |
1020 | tt_global_entry = container_of(tt_common_entry, struct tt_global_entry, |
1021 | common); | |
1022 | ||
a73105b8 AQ |
1023 | return (tt_global_entry->orig_node == orig_node); |
1024 | } | |
1025 | ||
1026 | static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, | |
1027 | struct hashtable_t *hash, | |
1028 | struct hard_iface *primary_if, | |
1029 | int (*valid_cb)(const void *, | |
1030 | const void *), | |
1031 | void *cb_data) | |
1032 | { | |
48100bac | 1033 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
1034 | struct tt_query_packet *tt_response; |
1035 | struct tt_change *tt_change; | |
1036 | struct hlist_node *node; | |
1037 | struct hlist_head *head; | |
1038 | struct sk_buff *skb = NULL; | |
1039 | uint16_t tt_tot, tt_count; | |
1040 | ssize_t tt_query_size = sizeof(struct tt_query_packet); | |
c90681b8 | 1041 | uint32_t i; |
a73105b8 AQ |
1042 | |
1043 | if (tt_query_size + tt_len > primary_if->soft_iface->mtu) { | |
1044 | tt_len = primary_if->soft_iface->mtu - tt_query_size; | |
1045 | tt_len -= tt_len % sizeof(struct tt_change); | |
1046 | } | |
1047 | tt_tot = tt_len / sizeof(struct tt_change); | |
1048 | ||
1049 | skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN); | |
1050 | if (!skb) | |
1051 | goto out; | |
1052 | ||
1053 | skb_reserve(skb, ETH_HLEN); | |
1054 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1055 | tt_query_size + tt_len); | |
1056 | tt_response->ttvn = ttvn; | |
a73105b8 AQ |
1057 | |
1058 | tt_change = (struct tt_change *)(skb->data + tt_query_size); | |
1059 | tt_count = 0; | |
1060 | ||
1061 | rcu_read_lock(); | |
1062 | for (i = 0; i < hash->size; i++) { | |
1063 | head = &hash->table[i]; | |
1064 | ||
48100bac | 1065 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 AQ |
1066 | head, hash_entry) { |
1067 | if (tt_count == tt_tot) | |
1068 | break; | |
1069 | ||
48100bac | 1070 | if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data))) |
a73105b8 AQ |
1071 | continue; |
1072 | ||
48100bac AQ |
1073 | memcpy(tt_change->addr, tt_common_entry->addr, |
1074 | ETH_ALEN); | |
a73105b8 AQ |
1075 | tt_change->flags = NO_FLAGS; |
1076 | ||
1077 | tt_count++; | |
1078 | tt_change++; | |
1079 | } | |
1080 | } | |
1081 | rcu_read_unlock(); | |
1082 | ||
9d852393 AQ |
1083 | /* store in the message the number of entries we have successfully |
1084 | * copied */ | |
1085 | tt_response->tt_data = htons(tt_count); | |
1086 | ||
a73105b8 AQ |
1087 | out: |
1088 | return skb; | |
1089 | } | |
1090 | ||
a943cac1 ML |
1091 | static int send_tt_request(struct bat_priv *bat_priv, |
1092 | struct orig_node *dst_orig_node, | |
1093 | uint8_t ttvn, uint16_t tt_crc, bool full_table) | |
a73105b8 AQ |
1094 | { |
1095 | struct sk_buff *skb = NULL; | |
1096 | struct tt_query_packet *tt_request; | |
1097 | struct neigh_node *neigh_node = NULL; | |
1098 | struct hard_iface *primary_if; | |
1099 | struct tt_req_node *tt_req_node = NULL; | |
1100 | int ret = 1; | |
1101 | ||
1102 | primary_if = primary_if_get_selected(bat_priv); | |
1103 | if (!primary_if) | |
1104 | goto out; | |
1105 | ||
1106 | /* The new tt_req will be issued only if I'm not waiting for a | |
1107 | * reply from the same orig_node yet */ | |
1108 | tt_req_node = new_tt_req_node(bat_priv, dst_orig_node); | |
1109 | if (!tt_req_node) | |
1110 | goto out; | |
1111 | ||
1112 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN); | |
1113 | if (!skb) | |
1114 | goto out; | |
1115 | ||
1116 | skb_reserve(skb, ETH_HLEN); | |
1117 | ||
1118 | tt_request = (struct tt_query_packet *)skb_put(skb, | |
1119 | sizeof(struct tt_query_packet)); | |
1120 | ||
76543d14 SE |
1121 | tt_request->header.packet_type = BAT_TT_QUERY; |
1122 | tt_request->header.version = COMPAT_VERSION; | |
a73105b8 AQ |
1123 | memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1124 | memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN); | |
76543d14 | 1125 | tt_request->header.ttl = TTL; |
a73105b8 AQ |
1126 | tt_request->ttvn = ttvn; |
1127 | tt_request->tt_data = tt_crc; | |
1128 | tt_request->flags = TT_REQUEST; | |
1129 | ||
1130 | if (full_table) | |
1131 | tt_request->flags |= TT_FULL_TABLE; | |
1132 | ||
1133 | neigh_node = orig_node_get_router(dst_orig_node); | |
1134 | if (!neigh_node) | |
1135 | goto out; | |
1136 | ||
1137 | bat_dbg(DBG_TT, bat_priv, "Sending TT_REQUEST to %pM via %pM " | |
1138 | "[%c]\n", dst_orig_node->orig, neigh_node->addr, | |
1139 | (full_table ? 'F' : '.')); | |
1140 | ||
1141 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1142 | ret = 0; | |
1143 | ||
1144 | out: | |
1145 | if (neigh_node) | |
1146 | neigh_node_free_ref(neigh_node); | |
1147 | if (primary_if) | |
1148 | hardif_free_ref(primary_if); | |
1149 | if (ret) | |
1150 | kfree_skb(skb); | |
1151 | if (ret && tt_req_node) { | |
1152 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1153 | list_del(&tt_req_node->list); | |
1154 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1155 | kfree(tt_req_node); | |
1156 | } | |
1157 | return ret; | |
1158 | } | |
1159 | ||
1160 | static bool send_other_tt_response(struct bat_priv *bat_priv, | |
1161 | struct tt_query_packet *tt_request) | |
1162 | { | |
1163 | struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL; | |
1164 | struct neigh_node *neigh_node = NULL; | |
1165 | struct hard_iface *primary_if = NULL; | |
1166 | uint8_t orig_ttvn, req_ttvn, ttvn; | |
1167 | int ret = false; | |
1168 | unsigned char *tt_buff; | |
1169 | bool full_table; | |
1170 | uint16_t tt_len, tt_tot; | |
1171 | struct sk_buff *skb = NULL; | |
1172 | struct tt_query_packet *tt_response; | |
1173 | ||
1174 | bat_dbg(DBG_TT, bat_priv, | |
1175 | "Received TT_REQUEST from %pM for " | |
1176 | "ttvn: %u (%pM) [%c]\n", tt_request->src, | |
1177 | tt_request->ttvn, tt_request->dst, | |
1178 | (tt_request->flags & TT_FULL_TABLE ? 'F' : '.')); | |
1179 | ||
1180 | /* Let's get the orig node of the REAL destination */ | |
eb7e2a1e | 1181 | req_dst_orig_node = orig_hash_find(bat_priv, tt_request->dst); |
a73105b8 AQ |
1182 | if (!req_dst_orig_node) |
1183 | goto out; | |
1184 | ||
eb7e2a1e | 1185 | res_dst_orig_node = orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1186 | if (!res_dst_orig_node) |
1187 | goto out; | |
1188 | ||
1189 | neigh_node = orig_node_get_router(res_dst_orig_node); | |
1190 | if (!neigh_node) | |
1191 | goto out; | |
1192 | ||
1193 | primary_if = primary_if_get_selected(bat_priv); | |
1194 | if (!primary_if) | |
1195 | goto out; | |
1196 | ||
1197 | orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1198 | req_ttvn = tt_request->ttvn; | |
1199 | ||
015758d0 | 1200 | /* I don't have the requested data */ |
a73105b8 AQ |
1201 | if (orig_ttvn != req_ttvn || |
1202 | tt_request->tt_data != req_dst_orig_node->tt_crc) | |
1203 | goto out; | |
1204 | ||
015758d0 | 1205 | /* If the full table has been explicitly requested */ |
a73105b8 AQ |
1206 | if (tt_request->flags & TT_FULL_TABLE || |
1207 | !req_dst_orig_node->tt_buff) | |
1208 | full_table = true; | |
1209 | else | |
1210 | full_table = false; | |
1211 | ||
1212 | /* In this version, fragmentation is not implemented, then | |
1213 | * I'll send only one packet with as much TT entries as I can */ | |
1214 | if (!full_table) { | |
1215 | spin_lock_bh(&req_dst_orig_node->tt_buff_lock); | |
1216 | tt_len = req_dst_orig_node->tt_buff_len; | |
1217 | tt_tot = tt_len / sizeof(struct tt_change); | |
1218 | ||
1219 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + | |
1220 | tt_len + ETH_HLEN); | |
1221 | if (!skb) | |
1222 | goto unlock; | |
1223 | ||
1224 | skb_reserve(skb, ETH_HLEN); | |
1225 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1226 | sizeof(struct tt_query_packet) + tt_len); | |
1227 | tt_response->ttvn = req_ttvn; | |
1228 | tt_response->tt_data = htons(tt_tot); | |
1229 | ||
1230 | tt_buff = skb->data + sizeof(struct tt_query_packet); | |
1231 | /* Copy the last orig_node's OGM buffer */ | |
1232 | memcpy(tt_buff, req_dst_orig_node->tt_buff, | |
1233 | req_dst_orig_node->tt_buff_len); | |
1234 | ||
1235 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1236 | } else { | |
1237 | tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) * | |
1238 | sizeof(struct tt_change); | |
1239 | ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1240 | ||
1241 | skb = tt_response_fill_table(tt_len, ttvn, | |
1242 | bat_priv->tt_global_hash, | |
1243 | primary_if, tt_global_valid_entry, | |
1244 | req_dst_orig_node); | |
1245 | if (!skb) | |
1246 | goto out; | |
1247 | ||
1248 | tt_response = (struct tt_query_packet *)skb->data; | |
1249 | } | |
1250 | ||
76543d14 SE |
1251 | tt_response->header.packet_type = BAT_TT_QUERY; |
1252 | tt_response->header.version = COMPAT_VERSION; | |
1253 | tt_response->header.ttl = TTL; | |
a73105b8 AQ |
1254 | memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN); |
1255 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
1256 | tt_response->flags = TT_RESPONSE; | |
1257 | ||
1258 | if (full_table) | |
1259 | tt_response->flags |= TT_FULL_TABLE; | |
1260 | ||
1261 | bat_dbg(DBG_TT, bat_priv, | |
1262 | "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n", | |
1263 | res_dst_orig_node->orig, neigh_node->addr, | |
1264 | req_dst_orig_node->orig, req_ttvn); | |
1265 | ||
1266 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1267 | ret = true; | |
1268 | goto out; | |
1269 | ||
1270 | unlock: | |
1271 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1272 | ||
1273 | out: | |
1274 | if (res_dst_orig_node) | |
1275 | orig_node_free_ref(res_dst_orig_node); | |
1276 | if (req_dst_orig_node) | |
1277 | orig_node_free_ref(req_dst_orig_node); | |
1278 | if (neigh_node) | |
1279 | neigh_node_free_ref(neigh_node); | |
1280 | if (primary_if) | |
1281 | hardif_free_ref(primary_if); | |
1282 | if (!ret) | |
1283 | kfree_skb(skb); | |
1284 | return ret; | |
1285 | ||
1286 | } | |
1287 | static bool send_my_tt_response(struct bat_priv *bat_priv, | |
1288 | struct tt_query_packet *tt_request) | |
1289 | { | |
1290 | struct orig_node *orig_node = NULL; | |
1291 | struct neigh_node *neigh_node = NULL; | |
1292 | struct hard_iface *primary_if = NULL; | |
1293 | uint8_t my_ttvn, req_ttvn, ttvn; | |
1294 | int ret = false; | |
1295 | unsigned char *tt_buff; | |
1296 | bool full_table; | |
1297 | uint16_t tt_len, tt_tot; | |
1298 | struct sk_buff *skb = NULL; | |
1299 | struct tt_query_packet *tt_response; | |
1300 | ||
1301 | bat_dbg(DBG_TT, bat_priv, | |
1302 | "Received TT_REQUEST from %pM for " | |
1303 | "ttvn: %u (me) [%c]\n", tt_request->src, | |
1304 | tt_request->ttvn, | |
1305 | (tt_request->flags & TT_FULL_TABLE ? 'F' : '.')); | |
1306 | ||
1307 | ||
1308 | my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1309 | req_ttvn = tt_request->ttvn; | |
1310 | ||
eb7e2a1e | 1311 | orig_node = orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1312 | if (!orig_node) |
1313 | goto out; | |
1314 | ||
1315 | neigh_node = orig_node_get_router(orig_node); | |
1316 | if (!neigh_node) | |
1317 | goto out; | |
1318 | ||
1319 | primary_if = primary_if_get_selected(bat_priv); | |
1320 | if (!primary_if) | |
1321 | goto out; | |
1322 | ||
1323 | /* If the full table has been explicitly requested or the gap | |
1324 | * is too big send the whole local translation table */ | |
1325 | if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn || | |
1326 | !bat_priv->tt_buff) | |
1327 | full_table = true; | |
1328 | else | |
1329 | full_table = false; | |
1330 | ||
1331 | /* In this version, fragmentation is not implemented, then | |
1332 | * I'll send only one packet with as much TT entries as I can */ | |
1333 | if (!full_table) { | |
1334 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
1335 | tt_len = bat_priv->tt_buff_len; | |
1336 | tt_tot = tt_len / sizeof(struct tt_change); | |
1337 | ||
1338 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + | |
1339 | tt_len + ETH_HLEN); | |
1340 | if (!skb) | |
1341 | goto unlock; | |
1342 | ||
1343 | skb_reserve(skb, ETH_HLEN); | |
1344 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1345 | sizeof(struct tt_query_packet) + tt_len); | |
1346 | tt_response->ttvn = req_ttvn; | |
1347 | tt_response->tt_data = htons(tt_tot); | |
1348 | ||
1349 | tt_buff = skb->data + sizeof(struct tt_query_packet); | |
1350 | memcpy(tt_buff, bat_priv->tt_buff, | |
1351 | bat_priv->tt_buff_len); | |
1352 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1353 | } else { | |
1354 | tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) * | |
1355 | sizeof(struct tt_change); | |
1356 | ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1357 | ||
1358 | skb = tt_response_fill_table(tt_len, ttvn, | |
1359 | bat_priv->tt_local_hash, | |
058d0e26 AQ |
1360 | primary_if, tt_local_valid_entry, |
1361 | NULL); | |
a73105b8 AQ |
1362 | if (!skb) |
1363 | goto out; | |
1364 | ||
1365 | tt_response = (struct tt_query_packet *)skb->data; | |
1366 | } | |
1367 | ||
76543d14 SE |
1368 | tt_response->header.packet_type = BAT_TT_QUERY; |
1369 | tt_response->header.version = COMPAT_VERSION; | |
1370 | tt_response->header.ttl = TTL; | |
a73105b8 AQ |
1371 | memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1372 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
1373 | tt_response->flags = TT_RESPONSE; | |
1374 | ||
1375 | if (full_table) | |
1376 | tt_response->flags |= TT_FULL_TABLE; | |
1377 | ||
1378 | bat_dbg(DBG_TT, bat_priv, | |
1379 | "Sending TT_RESPONSE to %pM via %pM [%c]\n", | |
1380 | orig_node->orig, neigh_node->addr, | |
1381 | (tt_response->flags & TT_FULL_TABLE ? 'F' : '.')); | |
1382 | ||
1383 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1384 | ret = true; | |
1385 | goto out; | |
1386 | ||
1387 | unlock: | |
1388 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1389 | out: | |
1390 | if (orig_node) | |
1391 | orig_node_free_ref(orig_node); | |
1392 | if (neigh_node) | |
1393 | neigh_node_free_ref(neigh_node); | |
1394 | if (primary_if) | |
1395 | hardif_free_ref(primary_if); | |
1396 | if (!ret) | |
1397 | kfree_skb(skb); | |
1398 | /* This packet was for me, so it doesn't need to be re-routed */ | |
1399 | return true; | |
1400 | } | |
1401 | ||
1402 | bool send_tt_response(struct bat_priv *bat_priv, | |
1403 | struct tt_query_packet *tt_request) | |
1404 | { | |
1405 | if (is_my_mac(tt_request->dst)) | |
1406 | return send_my_tt_response(bat_priv, tt_request); | |
1407 | else | |
1408 | return send_other_tt_response(bat_priv, tt_request); | |
1409 | } | |
1410 | ||
1411 | static void _tt_update_changes(struct bat_priv *bat_priv, | |
1412 | struct orig_node *orig_node, | |
1413 | struct tt_change *tt_change, | |
1414 | uint16_t tt_num_changes, uint8_t ttvn) | |
1415 | { | |
1416 | int i; | |
1417 | ||
1418 | for (i = 0; i < tt_num_changes; i++) { | |
5fbc1598 | 1419 | if ((tt_change + i)->flags & TT_CLIENT_DEL) |
a73105b8 AQ |
1420 | tt_global_del(bat_priv, orig_node, |
1421 | (tt_change + i)->addr, | |
cc47f66e AQ |
1422 | "tt removed by changes", |
1423 | (tt_change + i)->flags & TT_CLIENT_ROAM); | |
a73105b8 AQ |
1424 | else |
1425 | if (!tt_global_add(bat_priv, orig_node, | |
bc279080 AQ |
1426 | (tt_change + i)->addr, ttvn, false, |
1427 | (tt_change + i)->flags & | |
1428 | TT_CLIENT_WIFI)) | |
a73105b8 AQ |
1429 | /* In case of problem while storing a |
1430 | * global_entry, we stop the updating | |
1431 | * procedure without committing the | |
1432 | * ttvn change. This will avoid to send | |
1433 | * corrupted data on tt_request | |
1434 | */ | |
1435 | return; | |
1436 | } | |
17071578 | 1437 | orig_node->tt_initialised = true; |
a73105b8 AQ |
1438 | } |
1439 | ||
1440 | static void tt_fill_gtable(struct bat_priv *bat_priv, | |
1441 | struct tt_query_packet *tt_response) | |
1442 | { | |
1443 | struct orig_node *orig_node = NULL; | |
1444 | ||
1445 | orig_node = orig_hash_find(bat_priv, tt_response->src); | |
1446 | if (!orig_node) | |
1447 | goto out; | |
1448 | ||
1449 | /* Purge the old table first.. */ | |
1450 | tt_global_del_orig(bat_priv, orig_node, "Received full table"); | |
1451 | ||
1452 | _tt_update_changes(bat_priv, orig_node, | |
1453 | (struct tt_change *)(tt_response + 1), | |
1454 | tt_response->tt_data, tt_response->ttvn); | |
1455 | ||
1456 | spin_lock_bh(&orig_node->tt_buff_lock); | |
1457 | kfree(orig_node->tt_buff); | |
1458 | orig_node->tt_buff_len = 0; | |
1459 | orig_node->tt_buff = NULL; | |
1460 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1461 | ||
1462 | atomic_set(&orig_node->last_ttvn, tt_response->ttvn); | |
1463 | ||
1464 | out: | |
1465 | if (orig_node) | |
1466 | orig_node_free_ref(orig_node); | |
1467 | } | |
1468 | ||
a943cac1 ML |
1469 | static void tt_update_changes(struct bat_priv *bat_priv, |
1470 | struct orig_node *orig_node, | |
1471 | uint16_t tt_num_changes, uint8_t ttvn, | |
1472 | struct tt_change *tt_change) | |
a73105b8 AQ |
1473 | { |
1474 | _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes, | |
1475 | ttvn); | |
1476 | ||
1477 | tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change, | |
1478 | tt_num_changes); | |
1479 | atomic_set(&orig_node->last_ttvn, ttvn); | |
1480 | } | |
1481 | ||
1482 | bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr) | |
1483 | { | |
7683fdc1 AQ |
1484 | struct tt_local_entry *tt_local_entry = NULL; |
1485 | bool ret = false; | |
a73105b8 | 1486 | |
a73105b8 | 1487 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
1488 | if (!tt_local_entry) |
1489 | goto out; | |
058d0e26 AQ |
1490 | /* Check if the client has been logically deleted (but is kept for |
1491 | * consistency purpose) */ | |
48100bac | 1492 | if (tt_local_entry->common.flags & TT_CLIENT_PENDING) |
058d0e26 | 1493 | goto out; |
7683fdc1 AQ |
1494 | ret = true; |
1495 | out: | |
a73105b8 | 1496 | if (tt_local_entry) |
7683fdc1 AQ |
1497 | tt_local_entry_free_ref(tt_local_entry); |
1498 | return ret; | |
a73105b8 AQ |
1499 | } |
1500 | ||
1501 | void handle_tt_response(struct bat_priv *bat_priv, | |
1502 | struct tt_query_packet *tt_response) | |
1503 | { | |
1504 | struct tt_req_node *node, *safe; | |
1505 | struct orig_node *orig_node = NULL; | |
1506 | ||
1507 | bat_dbg(DBG_TT, bat_priv, "Received TT_RESPONSE from %pM for " | |
1508 | "ttvn %d t_size: %d [%c]\n", | |
1509 | tt_response->src, tt_response->ttvn, | |
1510 | tt_response->tt_data, | |
1511 | (tt_response->flags & TT_FULL_TABLE ? 'F' : '.')); | |
1512 | ||
1513 | orig_node = orig_hash_find(bat_priv, tt_response->src); | |
1514 | if (!orig_node) | |
1515 | goto out; | |
1516 | ||
1517 | if (tt_response->flags & TT_FULL_TABLE) | |
1518 | tt_fill_gtable(bat_priv, tt_response); | |
1519 | else | |
1520 | tt_update_changes(bat_priv, orig_node, tt_response->tt_data, | |
1521 | tt_response->ttvn, | |
1522 | (struct tt_change *)(tt_response + 1)); | |
1523 | ||
1524 | /* Delete the tt_req_node from pending tt_requests list */ | |
1525 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1526 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
1527 | if (!compare_eth(node->addr, tt_response->src)) | |
1528 | continue; | |
1529 | list_del(&node->list); | |
1530 | kfree(node); | |
1531 | } | |
1532 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1533 | ||
1534 | /* Recalculate the CRC for this orig_node and store it */ | |
a73105b8 | 1535 | orig_node->tt_crc = tt_global_crc(bat_priv, orig_node); |
cc47f66e AQ |
1536 | /* Roaming phase is over: tables are in sync again. I can |
1537 | * unset the flag */ | |
1538 | orig_node->tt_poss_change = false; | |
a73105b8 AQ |
1539 | out: |
1540 | if (orig_node) | |
1541 | orig_node_free_ref(orig_node); | |
1542 | } | |
1543 | ||
1544 | int tt_init(struct bat_priv *bat_priv) | |
1545 | { | |
1546 | if (!tt_local_init(bat_priv)) | |
1547 | return 0; | |
1548 | ||
1549 | if (!tt_global_init(bat_priv)) | |
1550 | return 0; | |
1551 | ||
1552 | tt_start_timer(bat_priv); | |
1553 | ||
1554 | return 1; | |
1555 | } | |
1556 | ||
cc47f66e | 1557 | static void tt_roam_list_free(struct bat_priv *bat_priv) |
a73105b8 | 1558 | { |
cc47f66e | 1559 | struct tt_roam_node *node, *safe; |
a73105b8 | 1560 | |
cc47f66e | 1561 | spin_lock_bh(&bat_priv->tt_roam_list_lock); |
a73105b8 | 1562 | |
cc47f66e AQ |
1563 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { |
1564 | list_del(&node->list); | |
1565 | kfree(node); | |
1566 | } | |
1567 | ||
1568 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1569 | } | |
1570 | ||
1571 | static void tt_roam_purge(struct bat_priv *bat_priv) | |
1572 | { | |
1573 | struct tt_roam_node *node, *safe; | |
1574 | ||
1575 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1576 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { | |
032b7969 | 1577 | if (!has_timed_out(node->first_time, ROAMING_MAX_TIME)) |
cc47f66e AQ |
1578 | continue; |
1579 | ||
1580 | list_del(&node->list); | |
1581 | kfree(node); | |
1582 | } | |
1583 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1584 | } | |
1585 | ||
1586 | /* This function checks whether the client already reached the | |
1587 | * maximum number of possible roaming phases. In this case the ROAMING_ADV | |
1588 | * will not be sent. | |
1589 | * | |
1590 | * returns true if the ROAMING_ADV can be sent, false otherwise */ | |
1591 | static bool tt_check_roam_count(struct bat_priv *bat_priv, | |
1592 | uint8_t *client) | |
1593 | { | |
1594 | struct tt_roam_node *tt_roam_node; | |
1595 | bool ret = false; | |
1596 | ||
1597 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1598 | /* The new tt_req will be issued only if I'm not waiting for a | |
1599 | * reply from the same orig_node yet */ | |
1600 | list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) { | |
1601 | if (!compare_eth(tt_roam_node->addr, client)) | |
1602 | continue; | |
1603 | ||
032b7969 | 1604 | if (has_timed_out(tt_roam_node->first_time, ROAMING_MAX_TIME)) |
cc47f66e AQ |
1605 | continue; |
1606 | ||
1607 | if (!atomic_dec_not_zero(&tt_roam_node->counter)) | |
1608 | /* Sorry, you roamed too many times! */ | |
1609 | goto unlock; | |
1610 | ret = true; | |
1611 | break; | |
1612 | } | |
1613 | ||
1614 | if (!ret) { | |
1615 | tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); | |
1616 | if (!tt_roam_node) | |
1617 | goto unlock; | |
1618 | ||
1619 | tt_roam_node->first_time = jiffies; | |
1620 | atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1); | |
1621 | memcpy(tt_roam_node->addr, client, ETH_ALEN); | |
1622 | ||
1623 | list_add(&tt_roam_node->list, &bat_priv->tt_roam_list); | |
1624 | ret = true; | |
1625 | } | |
1626 | ||
1627 | unlock: | |
1628 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1629 | return ret; | |
1630 | } | |
1631 | ||
1632 | void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client, | |
1633 | struct orig_node *orig_node) | |
1634 | { | |
1635 | struct neigh_node *neigh_node = NULL; | |
1636 | struct sk_buff *skb = NULL; | |
1637 | struct roam_adv_packet *roam_adv_packet; | |
1638 | int ret = 1; | |
1639 | struct hard_iface *primary_if; | |
1640 | ||
1641 | /* before going on we have to check whether the client has | |
1642 | * already roamed to us too many times */ | |
1643 | if (!tt_check_roam_count(bat_priv, client)) | |
1644 | goto out; | |
1645 | ||
1646 | skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN); | |
1647 | if (!skb) | |
1648 | goto out; | |
1649 | ||
1650 | skb_reserve(skb, ETH_HLEN); | |
1651 | ||
1652 | roam_adv_packet = (struct roam_adv_packet *)skb_put(skb, | |
1653 | sizeof(struct roam_adv_packet)); | |
1654 | ||
76543d14 SE |
1655 | roam_adv_packet->header.packet_type = BAT_ROAM_ADV; |
1656 | roam_adv_packet->header.version = COMPAT_VERSION; | |
1657 | roam_adv_packet->header.ttl = TTL; | |
cc47f66e AQ |
1658 | primary_if = primary_if_get_selected(bat_priv); |
1659 | if (!primary_if) | |
1660 | goto out; | |
1661 | memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN); | |
1662 | hardif_free_ref(primary_if); | |
1663 | memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN); | |
1664 | memcpy(roam_adv_packet->client, client, ETH_ALEN); | |
1665 | ||
1666 | neigh_node = orig_node_get_router(orig_node); | |
1667 | if (!neigh_node) | |
1668 | goto out; | |
1669 | ||
1670 | bat_dbg(DBG_TT, bat_priv, | |
1671 | "Sending ROAMING_ADV to %pM (client %pM) via %pM\n", | |
1672 | orig_node->orig, client, neigh_node->addr); | |
1673 | ||
1674 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
1675 | ret = 0; | |
1676 | ||
1677 | out: | |
1678 | if (neigh_node) | |
1679 | neigh_node_free_ref(neigh_node); | |
1680 | if (ret) | |
1681 | kfree_skb(skb); | |
1682 | return; | |
a73105b8 AQ |
1683 | } |
1684 | ||
1685 | static void tt_purge(struct work_struct *work) | |
1686 | { | |
1687 | struct delayed_work *delayed_work = | |
1688 | container_of(work, struct delayed_work, work); | |
1689 | struct bat_priv *bat_priv = | |
1690 | container_of(delayed_work, struct bat_priv, tt_work); | |
1691 | ||
1692 | tt_local_purge(bat_priv); | |
cc47f66e | 1693 | tt_global_roam_purge(bat_priv); |
a73105b8 | 1694 | tt_req_purge(bat_priv); |
cc47f66e | 1695 | tt_roam_purge(bat_priv); |
a73105b8 AQ |
1696 | |
1697 | tt_start_timer(bat_priv); | |
1698 | } | |
cc47f66e AQ |
1699 | |
1700 | void tt_free(struct bat_priv *bat_priv) | |
1701 | { | |
1702 | cancel_delayed_work_sync(&bat_priv->tt_work); | |
1703 | ||
1704 | tt_local_table_free(bat_priv); | |
1705 | tt_global_table_free(bat_priv); | |
1706 | tt_req_list_free(bat_priv); | |
1707 | tt_changes_list_free(bat_priv); | |
1708 | tt_roam_list_free(bat_priv); | |
1709 | ||
1710 | kfree(bat_priv->tt_buff); | |
1711 | } | |
058d0e26 | 1712 | |
697f2531 AQ |
1713 | /* This function will enable or disable the specified flags for all the entries |
1714 | * in the given hash table and returns the number of modified entries */ | |
1715 | static uint16_t tt_set_flags(struct hashtable_t *hash, uint16_t flags, | |
1716 | bool enable) | |
058d0e26 | 1717 | { |
c90681b8 | 1718 | uint32_t i; |
697f2531 | 1719 | uint16_t changed_num = 0; |
058d0e26 AQ |
1720 | struct hlist_head *head; |
1721 | struct hlist_node *node; | |
48100bac | 1722 | struct tt_common_entry *tt_common_entry; |
058d0e26 AQ |
1723 | |
1724 | if (!hash) | |
697f2531 | 1725 | goto out; |
058d0e26 AQ |
1726 | |
1727 | for (i = 0; i < hash->size; i++) { | |
1728 | head = &hash->table[i]; | |
1729 | ||
1730 | rcu_read_lock(); | |
48100bac | 1731 | hlist_for_each_entry_rcu(tt_common_entry, node, |
058d0e26 | 1732 | head, hash_entry) { |
697f2531 AQ |
1733 | if (enable) { |
1734 | if ((tt_common_entry->flags & flags) == flags) | |
1735 | continue; | |
1736 | tt_common_entry->flags |= flags; | |
1737 | } else { | |
1738 | if (!(tt_common_entry->flags & flags)) | |
1739 | continue; | |
1740 | tt_common_entry->flags &= ~flags; | |
1741 | } | |
1742 | changed_num++; | |
058d0e26 AQ |
1743 | } |
1744 | rcu_read_unlock(); | |
1745 | } | |
697f2531 AQ |
1746 | out: |
1747 | return changed_num; | |
058d0e26 AQ |
1748 | } |
1749 | ||
1750 | /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */ | |
1751 | static void tt_local_purge_pending_clients(struct bat_priv *bat_priv) | |
1752 | { | |
1753 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
48100bac | 1754 | struct tt_common_entry *tt_common_entry; |
058d0e26 AQ |
1755 | struct tt_local_entry *tt_local_entry; |
1756 | struct hlist_node *node, *node_tmp; | |
1757 | struct hlist_head *head; | |
1758 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
c90681b8 | 1759 | uint32_t i; |
058d0e26 AQ |
1760 | |
1761 | if (!hash) | |
1762 | return; | |
1763 | ||
1764 | for (i = 0; i < hash->size; i++) { | |
1765 | head = &hash->table[i]; | |
1766 | list_lock = &hash->list_locks[i]; | |
1767 | ||
1768 | spin_lock_bh(list_lock); | |
48100bac | 1769 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
058d0e26 | 1770 | head, hash_entry) { |
48100bac | 1771 | if (!(tt_common_entry->flags & TT_CLIENT_PENDING)) |
058d0e26 AQ |
1772 | continue; |
1773 | ||
1774 | bat_dbg(DBG_TT, bat_priv, "Deleting local tt entry " | |
48100bac | 1775 | "(%pM): pending\n", tt_common_entry->addr); |
058d0e26 AQ |
1776 | |
1777 | atomic_dec(&bat_priv->num_local_tt); | |
1778 | hlist_del_rcu(node); | |
48100bac AQ |
1779 | tt_local_entry = container_of(tt_common_entry, |
1780 | struct tt_local_entry, | |
1781 | common); | |
058d0e26 AQ |
1782 | tt_local_entry_free_ref(tt_local_entry); |
1783 | } | |
1784 | spin_unlock_bh(list_lock); | |
1785 | } | |
1786 | ||
1787 | } | |
1788 | ||
1789 | void tt_commit_changes(struct bat_priv *bat_priv) | |
1790 | { | |
697f2531 AQ |
1791 | uint16_t changed_num = tt_set_flags(bat_priv->tt_local_hash, |
1792 | TT_CLIENT_NEW, false); | |
1793 | /* all the reset entries have now to be effectively counted as local | |
1794 | * entries */ | |
1795 | atomic_add(changed_num, &bat_priv->num_local_tt); | |
058d0e26 AQ |
1796 | tt_local_purge_pending_clients(bat_priv); |
1797 | ||
1798 | /* Increment the TTVN only once per OGM interval */ | |
1799 | atomic_inc(&bat_priv->ttvn); | |
1800 | bat_priv->tt_poss_change = false; | |
1801 | } | |
59b699cd AQ |
1802 | |
1803 | bool is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, uint8_t *dst) | |
1804 | { | |
1805 | struct tt_local_entry *tt_local_entry = NULL; | |
1806 | struct tt_global_entry *tt_global_entry = NULL; | |
1807 | bool ret = true; | |
1808 | ||
1809 | if (!atomic_read(&bat_priv->ap_isolation)) | |
1810 | return false; | |
1811 | ||
1812 | tt_local_entry = tt_local_hash_find(bat_priv, dst); | |
1813 | if (!tt_local_entry) | |
1814 | goto out; | |
1815 | ||
1816 | tt_global_entry = tt_global_hash_find(bat_priv, src); | |
1817 | if (!tt_global_entry) | |
1818 | goto out; | |
1819 | ||
1820 | if (_is_ap_isolated(tt_local_entry, tt_global_entry)) | |
1821 | goto out; | |
1822 | ||
1823 | ret = false; | |
1824 | ||
1825 | out: | |
1826 | if (tt_global_entry) | |
1827 | tt_global_entry_free_ref(tt_global_entry); | |
1828 | if (tt_local_entry) | |
1829 | tt_local_entry_free_ref(tt_local_entry); | |
1830 | return ret; | |
1831 | } | |
a943cac1 ML |
1832 | |
1833 | void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
1834 | const unsigned char *tt_buff, uint8_t tt_num_changes, | |
1835 | uint8_t ttvn, uint16_t tt_crc) | |
1836 | { | |
1837 | uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
1838 | bool full_table = true; | |
1839 | ||
17071578 AQ |
1840 | /* orig table not initialised AND first diff is in the OGM OR the ttvn |
1841 | * increased by one -> we can apply the attached changes */ | |
1842 | if ((!orig_node->tt_initialised && ttvn == 1) || | |
1843 | ttvn - orig_ttvn == 1) { | |
a943cac1 ML |
1844 | /* the OGM could not contain the changes due to their size or |
1845 | * because they have already been sent TT_OGM_APPEND_MAX times. | |
1846 | * In this case send a tt request */ | |
1847 | if (!tt_num_changes) { | |
1848 | full_table = false; | |
1849 | goto request_table; | |
1850 | } | |
1851 | ||
1852 | tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn, | |
1853 | (struct tt_change *)tt_buff); | |
1854 | ||
1855 | /* Even if we received the precomputed crc with the OGM, we | |
1856 | * prefer to recompute it to spot any possible inconsistency | |
1857 | * in the global table */ | |
1858 | orig_node->tt_crc = tt_global_crc(bat_priv, orig_node); | |
1859 | ||
1860 | /* The ttvn alone is not enough to guarantee consistency | |
1861 | * because a single value could represent different states | |
1862 | * (due to the wrap around). Thus a node has to check whether | |
1863 | * the resulting table (after applying the changes) is still | |
1864 | * consistent or not. E.g. a node could disconnect while its | |
1865 | * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case | |
1866 | * checking the CRC value is mandatory to detect the | |
1867 | * inconsistency */ | |
1868 | if (orig_node->tt_crc != tt_crc) | |
1869 | goto request_table; | |
1870 | ||
1871 | /* Roaming phase is over: tables are in sync again. I can | |
1872 | * unset the flag */ | |
1873 | orig_node->tt_poss_change = false; | |
1874 | } else { | |
1875 | /* if we missed more than one change or our tables are not | |
1876 | * in sync anymore -> request fresh tt data */ | |
17071578 AQ |
1877 | if (!orig_node->tt_initialised || ttvn != orig_ttvn || |
1878 | orig_node->tt_crc != tt_crc) { | |
a943cac1 ML |
1879 | request_table: |
1880 | bat_dbg(DBG_TT, bat_priv, "TT inconsistency for %pM. " | |
1881 | "Need to retrieve the correct information " | |
1882 | "(ttvn: %u last_ttvn: %u crc: %u last_crc: " | |
1883 | "%u num_changes: %u)\n", orig_node->orig, ttvn, | |
1884 | orig_ttvn, tt_crc, orig_node->tt_crc, | |
1885 | tt_num_changes); | |
1886 | send_tt_request(bat_priv, orig_node, ttvn, tt_crc, | |
1887 | full_table); | |
1888 | return; | |
1889 | } | |
1890 | } | |
1891 | } |