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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 | 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); | |
144 | atomic_dec(&orig_entry->orig_node->tt_size); | |
145 | orig_node_free_ref(orig_entry->orig_node); | |
146 | kfree(orig_entry); | |
147 | } | |
148 | ||
149 | static void tt_orig_list_entry_free_ref(struct tt_orig_list_entry *orig_entry) | |
150 | { | |
151 | call_rcu(&orig_entry->rcu, tt_orig_list_entry_free_rcu); | |
7683fdc1 AQ |
152 | } |
153 | ||
ff66c975 AQ |
154 | static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr, |
155 | uint8_t flags) | |
a73105b8 AQ |
156 | { |
157 | struct tt_change_node *tt_change_node; | |
158 | ||
159 | tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC); | |
160 | ||
161 | if (!tt_change_node) | |
162 | return; | |
163 | ||
ff66c975 | 164 | tt_change_node->change.flags = flags; |
a73105b8 AQ |
165 | memcpy(tt_change_node->change.addr, addr, ETH_ALEN); |
166 | ||
167 | spin_lock_bh(&bat_priv->tt_changes_list_lock); | |
168 | /* track the change in the OGMinterval list */ | |
169 | list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list); | |
170 | atomic_inc(&bat_priv->tt_local_changes); | |
171 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); | |
172 | ||
173 | atomic_set(&bat_priv->tt_ogm_append_cnt, 0); | |
174 | } | |
175 | ||
176 | int tt_len(int changes_num) | |
177 | { | |
178 | return changes_num * sizeof(struct tt_change); | |
179 | } | |
180 | ||
181 | static int tt_local_init(struct bat_priv *bat_priv) | |
c6c8fea2 | 182 | { |
2dafb49d | 183 | if (bat_priv->tt_local_hash) |
5346c35e | 184 | return 0; |
c6c8fea2 | 185 | |
1a8eaf07 | 186 | bat_priv->tt_local_hash = batadv_hash_new(1024); |
c6c8fea2 | 187 | |
2dafb49d | 188 | if (!bat_priv->tt_local_hash) |
5346c35e | 189 | return -ENOMEM; |
c6c8fea2 | 190 | |
5346c35e | 191 | return 0; |
c6c8fea2 SE |
192 | } |
193 | ||
bc279080 AQ |
194 | void tt_local_add(struct net_device *soft_iface, const uint8_t *addr, |
195 | int ifindex) | |
c6c8fea2 SE |
196 | { |
197 | struct bat_priv *bat_priv = netdev_priv(soft_iface); | |
7683fdc1 AQ |
198 | struct tt_local_entry *tt_local_entry = NULL; |
199 | struct tt_global_entry *tt_global_entry = NULL; | |
db08e6e5 SW |
200 | struct hlist_head *head; |
201 | struct hlist_node *node; | |
202 | struct tt_orig_list_entry *orig_entry; | |
80b3f58c | 203 | int hash_added; |
c6c8fea2 | 204 | |
2dafb49d | 205 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
c6c8fea2 | 206 | |
2dafb49d AQ |
207 | if (tt_local_entry) { |
208 | tt_local_entry->last_seen = jiffies; | |
521251f2 AQ |
209 | /* possibly unset the TT_CLIENT_PENDING flag */ |
210 | tt_local_entry->common.flags &= ~TT_CLIENT_PENDING; | |
7683fdc1 | 211 | goto out; |
c6c8fea2 SE |
212 | } |
213 | ||
704509b8 | 214 | tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC); |
2dafb49d | 215 | if (!tt_local_entry) |
7683fdc1 | 216 | goto out; |
a73105b8 | 217 | |
a73105b8 AQ |
218 | bat_dbg(DBG_TT, bat_priv, |
219 | "Creating new local tt entry: %pM (ttvn: %d)\n", addr, | |
220 | (uint8_t)atomic_read(&bat_priv->ttvn)); | |
c6c8fea2 | 221 | |
48100bac AQ |
222 | memcpy(tt_local_entry->common.addr, addr, ETH_ALEN); |
223 | tt_local_entry->common.flags = NO_FLAGS; | |
9563877e | 224 | if (batadv_is_wifi_iface(ifindex)) |
48100bac AQ |
225 | tt_local_entry->common.flags |= TT_CLIENT_WIFI; |
226 | atomic_set(&tt_local_entry->common.refcount, 2); | |
227 | tt_local_entry->last_seen = jiffies; | |
c6c8fea2 SE |
228 | |
229 | /* the batman interface mac address should never be purged */ | |
39901e71 | 230 | if (compare_eth(addr, soft_iface->dev_addr)) |
48100bac | 231 | tt_local_entry->common.flags |= TT_CLIENT_NOPURGE; |
c6c8fea2 | 232 | |
c40ed2bf AQ |
233 | /* The local entry has to be marked as NEW to avoid to send it in |
234 | * a full table response going out before the next ttvn increment | |
235 | * (consistency check) */ | |
236 | tt_local_entry->common.flags |= TT_CLIENT_NEW; | |
237 | ||
80b3f58c SW |
238 | hash_added = hash_add(bat_priv->tt_local_hash, compare_tt, choose_orig, |
239 | &tt_local_entry->common, | |
240 | &tt_local_entry->common.hash_entry); | |
241 | ||
242 | if (unlikely(hash_added != 0)) { | |
243 | /* remove the reference for the hash */ | |
244 | tt_local_entry_free_ref(tt_local_entry); | |
245 | goto out; | |
246 | } | |
247 | ||
48100bac | 248 | tt_local_event(bat_priv, addr, tt_local_entry->common.flags); |
ff66c975 | 249 | |
c6c8fea2 | 250 | /* remove address from global hash if present */ |
2dafb49d | 251 | tt_global_entry = tt_global_hash_find(bat_priv, addr); |
c6c8fea2 | 252 | |
cc47f66e AQ |
253 | /* Check whether it is a roaming! */ |
254 | if (tt_global_entry) { | |
db08e6e5 SW |
255 | /* These node are probably going to update their tt table */ |
256 | head = &tt_global_entry->orig_list; | |
257 | rcu_read_lock(); | |
258 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
259 | orig_entry->orig_node->tt_poss_change = true; | |
260 | ||
261 | send_roam_adv(bat_priv, tt_global_entry->common.addr, | |
262 | orig_entry->orig_node); | |
263 | } | |
264 | rcu_read_unlock(); | |
265 | /* The global entry has to be marked as ROAMING and | |
266 | * has to be kept for consistency purpose | |
267 | */ | |
220b07e9 | 268 | tt_global_entry->common.flags |= TT_CLIENT_ROAM; |
03fc3070 | 269 | tt_global_entry->roam_at = jiffies; |
7683fdc1 AQ |
270 | } |
271 | out: | |
272 | if (tt_local_entry) | |
273 | tt_local_entry_free_ref(tt_local_entry); | |
274 | if (tt_global_entry) | |
275 | tt_global_entry_free_ref(tt_global_entry); | |
c6c8fea2 SE |
276 | } |
277 | ||
be9aa4c1 ML |
278 | static void tt_realloc_packet_buff(unsigned char **packet_buff, |
279 | int *packet_buff_len, int min_packet_len, | |
280 | int new_packet_len) | |
281 | { | |
282 | unsigned char *new_buff; | |
283 | ||
284 | new_buff = kmalloc(new_packet_len, GFP_ATOMIC); | |
285 | ||
286 | /* keep old buffer if kmalloc should fail */ | |
287 | if (new_buff) { | |
288 | memcpy(new_buff, *packet_buff, min_packet_len); | |
289 | kfree(*packet_buff); | |
290 | *packet_buff = new_buff; | |
291 | *packet_buff_len = new_packet_len; | |
292 | } | |
293 | } | |
294 | ||
295 | static void tt_prepare_packet_buff(struct bat_priv *bat_priv, | |
296 | unsigned char **packet_buff, | |
297 | int *packet_buff_len, int min_packet_len) | |
298 | { | |
299 | struct hard_iface *primary_if; | |
300 | int req_len; | |
301 | ||
302 | primary_if = primary_if_get_selected(bat_priv); | |
303 | ||
304 | req_len = min_packet_len; | |
305 | req_len += tt_len(atomic_read(&bat_priv->tt_local_changes)); | |
306 | ||
307 | /* if we have too many changes for one packet don't send any | |
308 | * and wait for the tt table request which will be fragmented | |
309 | */ | |
310 | if ((!primary_if) || (req_len > primary_if->soft_iface->mtu)) | |
311 | req_len = min_packet_len; | |
312 | ||
313 | tt_realloc_packet_buff(packet_buff, packet_buff_len, | |
314 | min_packet_len, req_len); | |
315 | ||
316 | if (primary_if) | |
317 | hardif_free_ref(primary_if); | |
318 | } | |
319 | ||
320 | static int tt_changes_fill_buff(struct bat_priv *bat_priv, | |
321 | unsigned char **packet_buff, | |
322 | int *packet_buff_len, int min_packet_len) | |
c6c8fea2 | 323 | { |
a73105b8 | 324 | struct tt_change_node *entry, *safe; |
be9aa4c1 ML |
325 | int count = 0, tot_changes = 0, new_len; |
326 | unsigned char *tt_buff; | |
327 | ||
328 | tt_prepare_packet_buff(bat_priv, packet_buff, | |
329 | packet_buff_len, min_packet_len); | |
c6c8fea2 | 330 | |
be9aa4c1 ML |
331 | new_len = *packet_buff_len - min_packet_len; |
332 | tt_buff = *packet_buff + min_packet_len; | |
333 | ||
334 | if (new_len > 0) | |
335 | tot_changes = new_len / tt_len(1); | |
c6c8fea2 | 336 | |
a73105b8 AQ |
337 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
338 | atomic_set(&bat_priv->tt_local_changes, 0); | |
c6c8fea2 | 339 | |
a73105b8 | 340 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
7c64fd98 | 341 | list) { |
a73105b8 | 342 | if (count < tot_changes) { |
be9aa4c1 | 343 | memcpy(tt_buff + tt_len(count), |
a73105b8 | 344 | &entry->change, sizeof(struct tt_change)); |
c6c8fea2 SE |
345 | count++; |
346 | } | |
a73105b8 AQ |
347 | list_del(&entry->list); |
348 | kfree(entry); | |
c6c8fea2 | 349 | } |
a73105b8 AQ |
350 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); |
351 | ||
352 | /* Keep the buffer for possible tt_request */ | |
353 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
354 | kfree(bat_priv->tt_buff); | |
355 | bat_priv->tt_buff_len = 0; | |
356 | bat_priv->tt_buff = NULL; | |
be9aa4c1 ML |
357 | /* check whether this new OGM has no changes due to size problems */ |
358 | if (new_len > 0) { | |
359 | /* if kmalloc() fails we will reply with the full table | |
a73105b8 AQ |
360 | * instead of providing the diff |
361 | */ | |
be9aa4c1 | 362 | bat_priv->tt_buff = kmalloc(new_len, GFP_ATOMIC); |
a73105b8 | 363 | if (bat_priv->tt_buff) { |
be9aa4c1 ML |
364 | memcpy(bat_priv->tt_buff, tt_buff, new_len); |
365 | bat_priv->tt_buff_len = new_len; | |
a73105b8 AQ |
366 | } |
367 | } | |
368 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
c6c8fea2 | 369 | |
08ad76ec | 370 | return count; |
c6c8fea2 SE |
371 | } |
372 | ||
2dafb49d | 373 | int tt_local_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
374 | { |
375 | struct net_device *net_dev = (struct net_device *)seq->private; | |
376 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
2dafb49d | 377 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
48100bac | 378 | struct tt_common_entry *tt_common_entry; |
32ae9b22 | 379 | struct hard_iface *primary_if; |
7aadf889 | 380 | struct hlist_node *node; |
c6c8fea2 | 381 | struct hlist_head *head; |
c90681b8 AQ |
382 | uint32_t i; |
383 | int ret = 0; | |
32ae9b22 ML |
384 | |
385 | primary_if = primary_if_get_selected(bat_priv); | |
386 | if (!primary_if) { | |
86ceb360 SE |
387 | ret = seq_printf(seq, |
388 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
389 | net_dev->name); |
390 | goto out; | |
391 | } | |
c6c8fea2 | 392 | |
32ae9b22 | 393 | if (primary_if->if_status != IF_ACTIVE) { |
86ceb360 SE |
394 | ret = seq_printf(seq, |
395 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
396 | net_dev->name); |
397 | goto out; | |
c6c8fea2 SE |
398 | } |
399 | ||
86ceb360 SE |
400 | seq_printf(seq, |
401 | "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n", | |
a73105b8 | 402 | net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn)); |
c6c8fea2 | 403 | |
c6c8fea2 SE |
404 | for (i = 0; i < hash->size; i++) { |
405 | head = &hash->table[i]; | |
406 | ||
7aadf889 | 407 | rcu_read_lock(); |
48100bac | 408 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 409 | head, hash_entry) { |
d099c2c5 | 410 | seq_printf(seq, " * %pM [%c%c%c%c%c]\n", |
7c64fd98 SE |
411 | tt_common_entry->addr, |
412 | (tt_common_entry->flags & | |
413 | TT_CLIENT_ROAM ? 'R' : '.'), | |
414 | (tt_common_entry->flags & | |
415 | TT_CLIENT_NOPURGE ? 'P' : '.'), | |
416 | (tt_common_entry->flags & | |
417 | TT_CLIENT_NEW ? 'N' : '.'), | |
418 | (tt_common_entry->flags & | |
419 | TT_CLIENT_PENDING ? 'X' : '.'), | |
420 | (tt_common_entry->flags & | |
421 | TT_CLIENT_WIFI ? 'W' : '.')); | |
c6c8fea2 | 422 | } |
7aadf889 | 423 | rcu_read_unlock(); |
c6c8fea2 | 424 | } |
32ae9b22 ML |
425 | out: |
426 | if (primary_if) | |
427 | hardif_free_ref(primary_if); | |
428 | return ret; | |
c6c8fea2 SE |
429 | } |
430 | ||
058d0e26 AQ |
431 | static void tt_local_set_pending(struct bat_priv *bat_priv, |
432 | struct tt_local_entry *tt_local_entry, | |
c566dbbe | 433 | uint16_t flags, const char *message) |
c6c8fea2 | 434 | { |
48100bac AQ |
435 | tt_local_event(bat_priv, tt_local_entry->common.addr, |
436 | tt_local_entry->common.flags | flags); | |
a73105b8 | 437 | |
015758d0 AQ |
438 | /* The local client has to be marked as "pending to be removed" but has |
439 | * to be kept in the table in order to send it in a full table | |
058d0e26 | 440 | * response issued before the net ttvn increment (consistency check) */ |
48100bac | 441 | tt_local_entry->common.flags |= TT_CLIENT_PENDING; |
c566dbbe | 442 | |
86ceb360 SE |
443 | bat_dbg(DBG_TT, bat_priv, |
444 | "Local tt entry (%pM) pending to be removed: %s\n", | |
445 | tt_local_entry->common.addr, message); | |
c6c8fea2 SE |
446 | } |
447 | ||
a73105b8 | 448 | void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr, |
cc47f66e | 449 | const char *message, bool roaming) |
c6c8fea2 | 450 | { |
7683fdc1 | 451 | struct tt_local_entry *tt_local_entry = NULL; |
c6c8fea2 | 452 | |
2dafb49d | 453 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
454 | if (!tt_local_entry) |
455 | goto out; | |
456 | ||
058d0e26 | 457 | tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL | |
c566dbbe | 458 | (roaming ? TT_CLIENT_ROAM : NO_FLAGS), message); |
7683fdc1 AQ |
459 | out: |
460 | if (tt_local_entry) | |
461 | tt_local_entry_free_ref(tt_local_entry); | |
c6c8fea2 SE |
462 | } |
463 | ||
a73105b8 | 464 | static void tt_local_purge(struct bat_priv *bat_priv) |
c6c8fea2 | 465 | { |
2dafb49d AQ |
466 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
467 | struct tt_local_entry *tt_local_entry; | |
48100bac | 468 | struct tt_common_entry *tt_common_entry; |
7aadf889 | 469 | struct hlist_node *node, *node_tmp; |
c6c8fea2 | 470 | struct hlist_head *head; |
7683fdc1 | 471 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 472 | uint32_t i; |
c6c8fea2 | 473 | |
c6c8fea2 SE |
474 | for (i = 0; i < hash->size; i++) { |
475 | head = &hash->table[i]; | |
7683fdc1 | 476 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 477 | |
7683fdc1 | 478 | spin_lock_bh(list_lock); |
48100bac | 479 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
7aadf889 | 480 | head, hash_entry) { |
48100bac AQ |
481 | tt_local_entry = container_of(tt_common_entry, |
482 | struct tt_local_entry, | |
483 | common); | |
484 | if (tt_local_entry->common.flags & TT_CLIENT_NOPURGE) | |
7aadf889 | 485 | continue; |
c6c8fea2 | 486 | |
058d0e26 | 487 | /* entry already marked for deletion */ |
48100bac | 488 | if (tt_local_entry->common.flags & TT_CLIENT_PENDING) |
058d0e26 AQ |
489 | continue; |
490 | ||
a04ccd59 | 491 | if (!has_timed_out(tt_local_entry->last_seen, |
032b7969 | 492 | TT_LOCAL_TIMEOUT)) |
7aadf889 ML |
493 | continue; |
494 | ||
058d0e26 | 495 | tt_local_set_pending(bat_priv, tt_local_entry, |
c566dbbe | 496 | TT_CLIENT_DEL, "timed out"); |
c6c8fea2 | 497 | } |
7683fdc1 | 498 | spin_unlock_bh(list_lock); |
c6c8fea2 SE |
499 | } |
500 | ||
c6c8fea2 SE |
501 | } |
502 | ||
a73105b8 | 503 | static void tt_local_table_free(struct bat_priv *bat_priv) |
c6c8fea2 | 504 | { |
a73105b8 | 505 | struct hashtable_t *hash; |
a73105b8 | 506 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
48100bac | 507 | struct tt_common_entry *tt_common_entry; |
a73105b8 | 508 | struct tt_local_entry *tt_local_entry; |
7683fdc1 AQ |
509 | struct hlist_node *node, *node_tmp; |
510 | struct hlist_head *head; | |
c90681b8 | 511 | uint32_t i; |
a73105b8 | 512 | |
2dafb49d | 513 | if (!bat_priv->tt_local_hash) |
c6c8fea2 SE |
514 | return; |
515 | ||
a73105b8 AQ |
516 | hash = bat_priv->tt_local_hash; |
517 | ||
518 | for (i = 0; i < hash->size; i++) { | |
519 | head = &hash->table[i]; | |
520 | list_lock = &hash->list_locks[i]; | |
521 | ||
522 | spin_lock_bh(list_lock); | |
48100bac | 523 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
a73105b8 AQ |
524 | head, hash_entry) { |
525 | hlist_del_rcu(node); | |
48100bac AQ |
526 | tt_local_entry = container_of(tt_common_entry, |
527 | struct tt_local_entry, | |
528 | common); | |
7683fdc1 | 529 | tt_local_entry_free_ref(tt_local_entry); |
a73105b8 AQ |
530 | } |
531 | spin_unlock_bh(list_lock); | |
532 | } | |
533 | ||
1a8eaf07 | 534 | batadv_hash_destroy(hash); |
a73105b8 | 535 | |
2dafb49d | 536 | bat_priv->tt_local_hash = NULL; |
c6c8fea2 SE |
537 | } |
538 | ||
a73105b8 | 539 | static int tt_global_init(struct bat_priv *bat_priv) |
c6c8fea2 | 540 | { |
2dafb49d | 541 | if (bat_priv->tt_global_hash) |
5346c35e | 542 | return 0; |
c6c8fea2 | 543 | |
1a8eaf07 | 544 | bat_priv->tt_global_hash = batadv_hash_new(1024); |
c6c8fea2 | 545 | |
2dafb49d | 546 | if (!bat_priv->tt_global_hash) |
5346c35e | 547 | return -ENOMEM; |
c6c8fea2 | 548 | |
5346c35e | 549 | return 0; |
c6c8fea2 SE |
550 | } |
551 | ||
a73105b8 | 552 | static void tt_changes_list_free(struct bat_priv *bat_priv) |
c6c8fea2 | 553 | { |
a73105b8 | 554 | struct tt_change_node *entry, *safe; |
c6c8fea2 | 555 | |
a73105b8 | 556 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
c6c8fea2 | 557 | |
a73105b8 AQ |
558 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
559 | list) { | |
560 | list_del(&entry->list); | |
561 | kfree(entry); | |
562 | } | |
c6c8fea2 | 563 | |
a73105b8 AQ |
564 | atomic_set(&bat_priv->tt_local_changes, 0); |
565 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); | |
566 | } | |
c6c8fea2 | 567 | |
db08e6e5 SW |
568 | /* find out if an orig_node is already in the list of a tt_global_entry. |
569 | * returns 1 if found, 0 otherwise | |
570 | */ | |
571 | static bool tt_global_entry_has_orig(const struct tt_global_entry *entry, | |
572 | const struct orig_node *orig_node) | |
573 | { | |
574 | struct tt_orig_list_entry *tmp_orig_entry; | |
575 | const struct hlist_head *head; | |
576 | struct hlist_node *node; | |
577 | bool found = false; | |
578 | ||
579 | rcu_read_lock(); | |
580 | head = &entry->orig_list; | |
581 | hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) { | |
582 | if (tmp_orig_entry->orig_node == orig_node) { | |
583 | found = true; | |
584 | break; | |
585 | } | |
586 | } | |
587 | rcu_read_unlock(); | |
588 | return found; | |
589 | } | |
590 | ||
591 | static void tt_global_add_orig_entry(struct tt_global_entry *tt_global_entry, | |
592 | struct orig_node *orig_node, | |
593 | int ttvn) | |
594 | { | |
595 | struct tt_orig_list_entry *orig_entry; | |
596 | ||
597 | orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC); | |
598 | if (!orig_entry) | |
599 | return; | |
600 | ||
601 | INIT_HLIST_NODE(&orig_entry->list); | |
602 | atomic_inc(&orig_node->refcount); | |
603 | atomic_inc(&orig_node->tt_size); | |
604 | orig_entry->orig_node = orig_node; | |
605 | orig_entry->ttvn = ttvn; | |
606 | ||
607 | spin_lock_bh(&tt_global_entry->list_lock); | |
608 | hlist_add_head_rcu(&orig_entry->list, | |
609 | &tt_global_entry->orig_list); | |
610 | spin_unlock_bh(&tt_global_entry->list_lock); | |
611 | } | |
612 | ||
a73105b8 AQ |
613 | /* caller must hold orig_node refcount */ |
614 | int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
bc279080 AQ |
615 | const unsigned char *tt_addr, uint8_t ttvn, bool roaming, |
616 | bool wifi) | |
a73105b8 | 617 | { |
db08e6e5 | 618 | struct tt_global_entry *tt_global_entry = NULL; |
7683fdc1 | 619 | int ret = 0; |
80b3f58c | 620 | int hash_added; |
c6c8fea2 | 621 | |
a73105b8 AQ |
622 | tt_global_entry = tt_global_hash_find(bat_priv, tt_addr); |
623 | ||
624 | if (!tt_global_entry) { | |
db08e6e5 SW |
625 | tt_global_entry = kzalloc(sizeof(*tt_global_entry), |
626 | GFP_ATOMIC); | |
a73105b8 | 627 | if (!tt_global_entry) |
7683fdc1 AQ |
628 | goto out; |
629 | ||
48100bac | 630 | memcpy(tt_global_entry->common.addr, tt_addr, ETH_ALEN); |
db08e6e5 | 631 | |
48100bac | 632 | tt_global_entry->common.flags = NO_FLAGS; |
cc47f66e | 633 | tt_global_entry->roam_at = 0; |
db08e6e5 SW |
634 | atomic_set(&tt_global_entry->common.refcount, 2); |
635 | ||
636 | INIT_HLIST_HEAD(&tt_global_entry->orig_list); | |
637 | spin_lock_init(&tt_global_entry->list_lock); | |
7683fdc1 | 638 | |
80b3f58c SW |
639 | hash_added = hash_add(bat_priv->tt_global_hash, compare_tt, |
640 | choose_orig, &tt_global_entry->common, | |
641 | &tt_global_entry->common.hash_entry); | |
642 | ||
643 | if (unlikely(hash_added != 0)) { | |
644 | /* remove the reference for the hash */ | |
645 | tt_global_entry_free_ref(tt_global_entry); | |
646 | goto out_remove; | |
647 | } | |
db08e6e5 SW |
648 | |
649 | tt_global_add_orig_entry(tt_global_entry, orig_node, ttvn); | |
a73105b8 | 650 | } else { |
db08e6e5 SW |
651 | /* there is already a global entry, use this one. */ |
652 | ||
653 | /* If there is the TT_CLIENT_ROAM flag set, there is only one | |
654 | * originator left in the list and we previously received a | |
655 | * delete + roaming change for this originator. | |
656 | * | |
657 | * We should first delete the old originator before adding the | |
658 | * new one. | |
659 | */ | |
660 | if (tt_global_entry->common.flags & TT_CLIENT_ROAM) { | |
661 | tt_global_del_orig_list(tt_global_entry); | |
662 | tt_global_entry->common.flags &= ~TT_CLIENT_ROAM; | |
663 | tt_global_entry->roam_at = 0; | |
a73105b8 | 664 | } |
db08e6e5 SW |
665 | |
666 | if (!tt_global_entry_has_orig(tt_global_entry, orig_node)) | |
667 | tt_global_add_orig_entry(tt_global_entry, orig_node, | |
668 | ttvn); | |
a73105b8 | 669 | } |
c6c8fea2 | 670 | |
bc279080 | 671 | if (wifi) |
48100bac | 672 | tt_global_entry->common.flags |= TT_CLIENT_WIFI; |
bc279080 | 673 | |
a73105b8 AQ |
674 | bat_dbg(DBG_TT, bat_priv, |
675 | "Creating new global tt entry: %pM (via %pM)\n", | |
48100bac | 676 | tt_global_entry->common.addr, orig_node->orig); |
c6c8fea2 | 677 | |
80b3f58c | 678 | out_remove: |
a73105b8 | 679 | /* remove address from local hash if present */ |
48100bac | 680 | tt_local_remove(bat_priv, tt_global_entry->common.addr, |
7683fdc1 AQ |
681 | "global tt received", roaming); |
682 | ret = 1; | |
683 | out: | |
684 | if (tt_global_entry) | |
685 | tt_global_entry_free_ref(tt_global_entry); | |
686 | return ret; | |
c6c8fea2 SE |
687 | } |
688 | ||
db08e6e5 SW |
689 | /* print all orig nodes who announce the address for this global entry. |
690 | * it is assumed that the caller holds rcu_read_lock(); | |
691 | */ | |
692 | static void tt_global_print_entry(struct tt_global_entry *tt_global_entry, | |
693 | struct seq_file *seq) | |
694 | { | |
695 | struct hlist_head *head; | |
696 | struct hlist_node *node; | |
697 | struct tt_orig_list_entry *orig_entry; | |
698 | struct tt_common_entry *tt_common_entry; | |
699 | uint16_t flags; | |
700 | uint8_t last_ttvn; | |
701 | ||
702 | tt_common_entry = &tt_global_entry->common; | |
703 | ||
704 | head = &tt_global_entry->orig_list; | |
705 | ||
706 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
707 | flags = tt_common_entry->flags; | |
708 | last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn); | |
709 | seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c]\n", | |
710 | tt_global_entry->common.addr, orig_entry->ttvn, | |
711 | orig_entry->orig_node->orig, last_ttvn, | |
712 | (flags & TT_CLIENT_ROAM ? 'R' : '.'), | |
713 | (flags & TT_CLIENT_WIFI ? 'W' : '.')); | |
714 | } | |
715 | } | |
716 | ||
2dafb49d | 717 | int tt_global_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
718 | { |
719 | struct net_device *net_dev = (struct net_device *)seq->private; | |
720 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
2dafb49d | 721 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
48100bac | 722 | struct tt_common_entry *tt_common_entry; |
2dafb49d | 723 | struct tt_global_entry *tt_global_entry; |
32ae9b22 | 724 | struct hard_iface *primary_if; |
7aadf889 | 725 | struct hlist_node *node; |
c6c8fea2 | 726 | struct hlist_head *head; |
c90681b8 AQ |
727 | uint32_t i; |
728 | int ret = 0; | |
32ae9b22 ML |
729 | |
730 | primary_if = primary_if_get_selected(bat_priv); | |
731 | if (!primary_if) { | |
86ceb360 SE |
732 | ret = seq_printf(seq, |
733 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
734 | net_dev->name); |
735 | goto out; | |
736 | } | |
c6c8fea2 | 737 | |
32ae9b22 | 738 | if (primary_if->if_status != IF_ACTIVE) { |
86ceb360 SE |
739 | ret = seq_printf(seq, |
740 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
741 | net_dev->name); |
742 | goto out; | |
c6c8fea2 SE |
743 | } |
744 | ||
2dafb49d AQ |
745 | seq_printf(seq, |
746 | "Globally announced TT entries received via the mesh %s\n", | |
c6c8fea2 | 747 | net_dev->name); |
df6edb9e AQ |
748 | seq_printf(seq, " %-13s %s %-15s %s %s\n", |
749 | "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags"); | |
c6c8fea2 | 750 | |
c6c8fea2 SE |
751 | for (i = 0; i < hash->size; i++) { |
752 | head = &hash->table[i]; | |
753 | ||
7aadf889 | 754 | rcu_read_lock(); |
48100bac | 755 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 756 | head, hash_entry) { |
48100bac AQ |
757 | tt_global_entry = container_of(tt_common_entry, |
758 | struct tt_global_entry, | |
759 | common); | |
db08e6e5 | 760 | tt_global_print_entry(tt_global_entry, seq); |
c6c8fea2 | 761 | } |
7aadf889 | 762 | rcu_read_unlock(); |
c6c8fea2 | 763 | } |
32ae9b22 ML |
764 | out: |
765 | if (primary_if) | |
766 | hardif_free_ref(primary_if); | |
767 | return ret; | |
c6c8fea2 SE |
768 | } |
769 | ||
db08e6e5 SW |
770 | /* deletes the orig list of a tt_global_entry */ |
771 | static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry) | |
c6c8fea2 | 772 | { |
db08e6e5 SW |
773 | struct hlist_head *head; |
774 | struct hlist_node *node, *safe; | |
775 | struct tt_orig_list_entry *orig_entry; | |
a73105b8 | 776 | |
db08e6e5 SW |
777 | spin_lock_bh(&tt_global_entry->list_lock); |
778 | head = &tt_global_entry->orig_list; | |
779 | hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { | |
780 | hlist_del_rcu(node); | |
781 | tt_orig_list_entry_free_ref(orig_entry); | |
782 | } | |
783 | spin_unlock_bh(&tt_global_entry->list_lock); | |
c6c8fea2 | 784 | |
db08e6e5 SW |
785 | } |
786 | ||
787 | static void tt_global_del_orig_entry(struct bat_priv *bat_priv, | |
788 | struct tt_global_entry *tt_global_entry, | |
789 | struct orig_node *orig_node, | |
790 | const char *message) | |
791 | { | |
792 | struct hlist_head *head; | |
793 | struct hlist_node *node, *safe; | |
794 | struct tt_orig_list_entry *orig_entry; | |
795 | ||
796 | spin_lock_bh(&tt_global_entry->list_lock); | |
797 | head = &tt_global_entry->orig_list; | |
798 | hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { | |
799 | if (orig_entry->orig_node == orig_node) { | |
800 | bat_dbg(DBG_TT, bat_priv, | |
801 | "Deleting %pM from global tt entry %pM: %s\n", | |
802 | orig_node->orig, tt_global_entry->common.addr, | |
803 | message); | |
804 | hlist_del_rcu(node); | |
805 | tt_orig_list_entry_free_ref(orig_entry); | |
806 | } | |
807 | } | |
808 | spin_unlock_bh(&tt_global_entry->list_lock); | |
809 | } | |
810 | ||
811 | static void tt_global_del_struct(struct bat_priv *bat_priv, | |
812 | struct tt_global_entry *tt_global_entry, | |
813 | const char *message) | |
814 | { | |
815 | bat_dbg(DBG_TT, bat_priv, | |
816 | "Deleting global tt entry %pM: %s\n", | |
817 | tt_global_entry->common.addr, message); | |
7683fdc1 | 818 | |
48100bac AQ |
819 | hash_remove(bat_priv->tt_global_hash, compare_tt, choose_orig, |
820 | tt_global_entry->common.addr); | |
db08e6e5 SW |
821 | tt_global_entry_free_ref(tt_global_entry); |
822 | ||
c6c8fea2 SE |
823 | } |
824 | ||
db08e6e5 SW |
825 | /* If the client is to be deleted, we check if it is the last origantor entry |
826 | * within tt_global entry. If yes, we set the TT_CLIENT_ROAM flag and the timer, | |
827 | * otherwise we simply remove the originator scheduled for deletion. | |
828 | */ | |
829 | static void tt_global_del_roaming(struct bat_priv *bat_priv, | |
830 | struct tt_global_entry *tt_global_entry, | |
831 | struct orig_node *orig_node, | |
832 | const char *message) | |
833 | { | |
834 | bool last_entry = true; | |
835 | struct hlist_head *head; | |
836 | struct hlist_node *node; | |
837 | struct tt_orig_list_entry *orig_entry; | |
838 | ||
839 | /* no local entry exists, case 1: | |
840 | * Check if this is the last one or if other entries exist. | |
841 | */ | |
842 | ||
843 | rcu_read_lock(); | |
844 | head = &tt_global_entry->orig_list; | |
845 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
846 | if (orig_entry->orig_node != orig_node) { | |
847 | last_entry = false; | |
848 | break; | |
849 | } | |
850 | } | |
851 | rcu_read_unlock(); | |
852 | ||
853 | if (last_entry) { | |
854 | /* its the last one, mark for roaming. */ | |
855 | tt_global_entry->common.flags |= TT_CLIENT_ROAM; | |
856 | tt_global_entry->roam_at = jiffies; | |
857 | } else | |
858 | /* there is another entry, we can simply delete this | |
859 | * one and can still use the other one. | |
860 | */ | |
861 | tt_global_del_orig_entry(bat_priv, tt_global_entry, | |
862 | orig_node, message); | |
863 | } | |
864 | ||
865 | ||
866 | ||
de7aae65 SE |
867 | static void tt_global_del(struct bat_priv *bat_priv, |
868 | struct orig_node *orig_node, | |
869 | const unsigned char *addr, | |
870 | const char *message, bool roaming) | |
a73105b8 | 871 | { |
7683fdc1 | 872 | struct tt_global_entry *tt_global_entry = NULL; |
797399b4 | 873 | struct tt_local_entry *tt_local_entry = NULL; |
a73105b8 | 874 | |
a73105b8 | 875 | tt_global_entry = tt_global_hash_find(bat_priv, addr); |
db08e6e5 | 876 | if (!tt_global_entry) |
7683fdc1 | 877 | goto out; |
a73105b8 | 878 | |
db08e6e5 SW |
879 | if (!roaming) { |
880 | tt_global_del_orig_entry(bat_priv, tt_global_entry, orig_node, | |
881 | message); | |
882 | ||
883 | if (hlist_empty(&tt_global_entry->orig_list)) | |
884 | tt_global_del_struct(bat_priv, tt_global_entry, | |
885 | message); | |
886 | ||
887 | goto out; | |
888 | } | |
92f90f56 SE |
889 | |
890 | /* if we are deleting a global entry due to a roam | |
891 | * event, there are two possibilities: | |
db08e6e5 SW |
892 | * 1) the client roamed from node A to node B => if there |
893 | * is only one originator left for this client, we mark | |
92f90f56 SE |
894 | * it with TT_CLIENT_ROAM, we start a timer and we |
895 | * wait for node B to claim it. In case of timeout | |
896 | * the entry is purged. | |
db08e6e5 SW |
897 | * |
898 | * If there are other originators left, we directly delete | |
899 | * the originator. | |
92f90f56 SE |
900 | * 2) the client roamed to us => we can directly delete |
901 | * the global entry, since it is useless now. */ | |
db08e6e5 | 902 | |
92f90f56 SE |
903 | tt_local_entry = tt_local_hash_find(bat_priv, |
904 | tt_global_entry->common.addr); | |
db08e6e5 SW |
905 | if (tt_local_entry) { |
906 | /* local entry exists, case 2: client roamed to us. */ | |
907 | tt_global_del_orig_list(tt_global_entry); | |
908 | tt_global_del_struct(bat_priv, tt_global_entry, message); | |
909 | } else | |
910 | /* no local entry exists, case 1: check for roaming */ | |
911 | tt_global_del_roaming(bat_priv, tt_global_entry, orig_node, | |
912 | message); | |
92f90f56 | 913 | |
92f90f56 | 914 | |
cc47f66e | 915 | out: |
7683fdc1 AQ |
916 | if (tt_global_entry) |
917 | tt_global_entry_free_ref(tt_global_entry); | |
797399b4 AQ |
918 | if (tt_local_entry) |
919 | tt_local_entry_free_ref(tt_local_entry); | |
a73105b8 AQ |
920 | } |
921 | ||
2dafb49d | 922 | void tt_global_del_orig(struct bat_priv *bat_priv, |
a73105b8 | 923 | struct orig_node *orig_node, const char *message) |
c6c8fea2 | 924 | { |
2dafb49d | 925 | struct tt_global_entry *tt_global_entry; |
48100bac | 926 | struct tt_common_entry *tt_common_entry; |
c90681b8 | 927 | uint32_t i; |
a73105b8 AQ |
928 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
929 | struct hlist_node *node, *safe; | |
930 | struct hlist_head *head; | |
7683fdc1 | 931 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c6c8fea2 | 932 | |
6e801494 SW |
933 | if (!hash) |
934 | return; | |
935 | ||
a73105b8 AQ |
936 | for (i = 0; i < hash->size; i++) { |
937 | head = &hash->table[i]; | |
7683fdc1 | 938 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 939 | |
7683fdc1 | 940 | spin_lock_bh(list_lock); |
48100bac | 941 | hlist_for_each_entry_safe(tt_common_entry, node, safe, |
7c64fd98 | 942 | head, hash_entry) { |
48100bac AQ |
943 | tt_global_entry = container_of(tt_common_entry, |
944 | struct tt_global_entry, | |
945 | common); | |
db08e6e5 SW |
946 | |
947 | tt_global_del_orig_entry(bat_priv, tt_global_entry, | |
948 | orig_node, message); | |
949 | ||
950 | if (hlist_empty(&tt_global_entry->orig_list)) { | |
7683fdc1 | 951 | bat_dbg(DBG_TT, bat_priv, |
db08e6e5 | 952 | "Deleting global tt entry %pM: %s\n", |
48100bac | 953 | tt_global_entry->common.addr, |
87944973 | 954 | message); |
7683fdc1 AQ |
955 | hlist_del_rcu(node); |
956 | tt_global_entry_free_ref(tt_global_entry); | |
957 | } | |
a73105b8 | 958 | } |
7683fdc1 | 959 | spin_unlock_bh(list_lock); |
c6c8fea2 | 960 | } |
a73105b8 | 961 | atomic_set(&orig_node->tt_size, 0); |
17071578 | 962 | orig_node->tt_initialised = false; |
c6c8fea2 SE |
963 | } |
964 | ||
cc47f66e AQ |
965 | static void tt_global_roam_purge(struct bat_priv *bat_priv) |
966 | { | |
967 | struct hashtable_t *hash = bat_priv->tt_global_hash; | |
48100bac | 968 | struct tt_common_entry *tt_common_entry; |
cc47f66e AQ |
969 | struct tt_global_entry *tt_global_entry; |
970 | struct hlist_node *node, *node_tmp; | |
971 | struct hlist_head *head; | |
7683fdc1 | 972 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 973 | uint32_t i; |
cc47f66e | 974 | |
cc47f66e AQ |
975 | for (i = 0; i < hash->size; i++) { |
976 | head = &hash->table[i]; | |
7683fdc1 | 977 | list_lock = &hash->list_locks[i]; |
cc47f66e | 978 | |
7683fdc1 | 979 | spin_lock_bh(list_lock); |
48100bac | 980 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
cc47f66e | 981 | head, hash_entry) { |
48100bac AQ |
982 | tt_global_entry = container_of(tt_common_entry, |
983 | struct tt_global_entry, | |
984 | common); | |
985 | if (!(tt_global_entry->common.flags & TT_CLIENT_ROAM)) | |
cc47f66e | 986 | continue; |
a04ccd59 | 987 | if (!has_timed_out(tt_global_entry->roam_at, |
032b7969 | 988 | TT_CLIENT_ROAM_TIMEOUT)) |
cc47f66e AQ |
989 | continue; |
990 | ||
86ceb360 SE |
991 | bat_dbg(DBG_TT, bat_priv, |
992 | "Deleting global tt entry (%pM): Roaming timeout\n", | |
48100bac | 993 | tt_global_entry->common.addr); |
db08e6e5 | 994 | |
7683fdc1 AQ |
995 | hlist_del_rcu(node); |
996 | tt_global_entry_free_ref(tt_global_entry); | |
cc47f66e | 997 | } |
7683fdc1 | 998 | spin_unlock_bh(list_lock); |
cc47f66e AQ |
999 | } |
1000 | ||
cc47f66e AQ |
1001 | } |
1002 | ||
a73105b8 | 1003 | static void tt_global_table_free(struct bat_priv *bat_priv) |
c6c8fea2 | 1004 | { |
7683fdc1 AQ |
1005 | struct hashtable_t *hash; |
1006 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
48100bac | 1007 | struct tt_common_entry *tt_common_entry; |
7683fdc1 AQ |
1008 | struct tt_global_entry *tt_global_entry; |
1009 | struct hlist_node *node, *node_tmp; | |
1010 | struct hlist_head *head; | |
c90681b8 | 1011 | uint32_t i; |
7683fdc1 | 1012 | |
2dafb49d | 1013 | if (!bat_priv->tt_global_hash) |
c6c8fea2 SE |
1014 | return; |
1015 | ||
7683fdc1 AQ |
1016 | hash = bat_priv->tt_global_hash; |
1017 | ||
1018 | for (i = 0; i < hash->size; i++) { | |
1019 | head = &hash->table[i]; | |
1020 | list_lock = &hash->list_locks[i]; | |
1021 | ||
1022 | spin_lock_bh(list_lock); | |
48100bac | 1023 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
7683fdc1 AQ |
1024 | head, hash_entry) { |
1025 | hlist_del_rcu(node); | |
48100bac AQ |
1026 | tt_global_entry = container_of(tt_common_entry, |
1027 | struct tt_global_entry, | |
1028 | common); | |
7683fdc1 AQ |
1029 | tt_global_entry_free_ref(tt_global_entry); |
1030 | } | |
1031 | spin_unlock_bh(list_lock); | |
1032 | } | |
1033 | ||
1a8eaf07 | 1034 | batadv_hash_destroy(hash); |
7683fdc1 | 1035 | |
2dafb49d | 1036 | bat_priv->tt_global_hash = NULL; |
c6c8fea2 SE |
1037 | } |
1038 | ||
59b699cd AQ |
1039 | static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry, |
1040 | struct tt_global_entry *tt_global_entry) | |
1041 | { | |
1042 | bool ret = false; | |
1043 | ||
48100bac AQ |
1044 | if (tt_local_entry->common.flags & TT_CLIENT_WIFI && |
1045 | tt_global_entry->common.flags & TT_CLIENT_WIFI) | |
59b699cd AQ |
1046 | ret = true; |
1047 | ||
1048 | return ret; | |
1049 | } | |
1050 | ||
747e4221 | 1051 | struct orig_node *transtable_search(struct bat_priv *bat_priv, |
3d393e47 | 1052 | const uint8_t *src, const uint8_t *addr) |
c6c8fea2 | 1053 | { |
3d393e47 AQ |
1054 | struct tt_local_entry *tt_local_entry = NULL; |
1055 | struct tt_global_entry *tt_global_entry = NULL; | |
7b36e8ee | 1056 | struct orig_node *orig_node = NULL; |
db08e6e5 SW |
1057 | struct neigh_node *router = NULL; |
1058 | struct hlist_head *head; | |
1059 | struct hlist_node *node; | |
1060 | struct tt_orig_list_entry *orig_entry; | |
1061 | int best_tq; | |
c6c8fea2 | 1062 | |
3d393e47 AQ |
1063 | if (src && atomic_read(&bat_priv->ap_isolation)) { |
1064 | tt_local_entry = tt_local_hash_find(bat_priv, src); | |
1065 | if (!tt_local_entry) | |
1066 | goto out; | |
1067 | } | |
7aadf889 | 1068 | |
3d393e47 | 1069 | tt_global_entry = tt_global_hash_find(bat_priv, addr); |
2dafb49d | 1070 | if (!tt_global_entry) |
7b36e8ee | 1071 | goto out; |
7aadf889 | 1072 | |
3d393e47 AQ |
1073 | /* check whether the clients should not communicate due to AP |
1074 | * isolation */ | |
1075 | if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry)) | |
1076 | goto out; | |
1077 | ||
db08e6e5 | 1078 | best_tq = 0; |
c6c8fea2 | 1079 | |
db08e6e5 SW |
1080 | rcu_read_lock(); |
1081 | head = &tt_global_entry->orig_list; | |
1082 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
1083 | router = orig_node_get_router(orig_entry->orig_node); | |
1084 | if (!router) | |
1085 | continue; | |
c6c8fea2 | 1086 | |
db08e6e5 SW |
1087 | if (router->tq_avg > best_tq) { |
1088 | orig_node = orig_entry->orig_node; | |
1089 | best_tq = router->tq_avg; | |
1090 | } | |
1091 | neigh_node_free_ref(router); | |
1092 | } | |
1093 | /* found anything? */ | |
1094 | if (orig_node && !atomic_inc_not_zero(&orig_node->refcount)) | |
1095 | orig_node = NULL; | |
1096 | rcu_read_unlock(); | |
7b36e8ee | 1097 | out: |
3d393e47 AQ |
1098 | if (tt_global_entry) |
1099 | tt_global_entry_free_ref(tt_global_entry); | |
1100 | if (tt_local_entry) | |
1101 | tt_local_entry_free_ref(tt_local_entry); | |
1102 | ||
7b36e8ee | 1103 | return orig_node; |
c6c8fea2 | 1104 | } |
a73105b8 AQ |
1105 | |
1106 | /* Calculates the checksum of the local table of a given orig_node */ | |
de7aae65 SE |
1107 | static uint16_t tt_global_crc(struct bat_priv *bat_priv, |
1108 | struct orig_node *orig_node) | |
a73105b8 AQ |
1109 | { |
1110 | uint16_t total = 0, total_one; | |
1111 | struct hashtable_t *hash = bat_priv->tt_global_hash; | |
48100bac | 1112 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
1113 | struct tt_global_entry *tt_global_entry; |
1114 | struct hlist_node *node; | |
1115 | struct hlist_head *head; | |
c90681b8 AQ |
1116 | uint32_t i; |
1117 | int j; | |
a73105b8 AQ |
1118 | |
1119 | for (i = 0; i < hash->size; i++) { | |
1120 | head = &hash->table[i]; | |
1121 | ||
1122 | rcu_read_lock(); | |
48100bac | 1123 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 | 1124 | head, hash_entry) { |
48100bac AQ |
1125 | tt_global_entry = container_of(tt_common_entry, |
1126 | struct tt_global_entry, | |
1127 | common); | |
db08e6e5 SW |
1128 | /* Roaming clients are in the global table for |
1129 | * consistency only. They don't have to be | |
1130 | * taken into account while computing the | |
1131 | * global crc | |
1132 | */ | |
1133 | if (tt_global_entry->common.flags & TT_CLIENT_ROAM) | |
1134 | continue; | |
1135 | ||
1136 | /* find out if this global entry is announced by this | |
1137 | * originator | |
1138 | */ | |
1139 | if (!tt_global_entry_has_orig(tt_global_entry, | |
1140 | orig_node)) | |
1141 | continue; | |
1142 | ||
1143 | total_one = 0; | |
1144 | for (j = 0; j < ETH_ALEN; j++) | |
1145 | total_one = crc16_byte(total_one, | |
1146 | tt_global_entry->common.addr[j]); | |
1147 | total ^= total_one; | |
a73105b8 AQ |
1148 | } |
1149 | rcu_read_unlock(); | |
1150 | } | |
1151 | ||
1152 | return total; | |
1153 | } | |
1154 | ||
1155 | /* Calculates the checksum of the local table */ | |
be9aa4c1 | 1156 | static uint16_t batadv_tt_local_crc(struct bat_priv *bat_priv) |
a73105b8 AQ |
1157 | { |
1158 | uint16_t total = 0, total_one; | |
1159 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
48100bac | 1160 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
1161 | struct hlist_node *node; |
1162 | struct hlist_head *head; | |
c90681b8 AQ |
1163 | uint32_t i; |
1164 | int j; | |
a73105b8 AQ |
1165 | |
1166 | for (i = 0; i < hash->size; i++) { | |
1167 | head = &hash->table[i]; | |
1168 | ||
1169 | rcu_read_lock(); | |
48100bac | 1170 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 | 1171 | head, hash_entry) { |
058d0e26 AQ |
1172 | /* not yet committed clients have not to be taken into |
1173 | * account while computing the CRC */ | |
48100bac | 1174 | if (tt_common_entry->flags & TT_CLIENT_NEW) |
058d0e26 | 1175 | continue; |
a73105b8 AQ |
1176 | total_one = 0; |
1177 | for (j = 0; j < ETH_ALEN; j++) | |
1178 | total_one = crc16_byte(total_one, | |
48100bac | 1179 | tt_common_entry->addr[j]); |
a73105b8 AQ |
1180 | total ^= total_one; |
1181 | } | |
a73105b8 AQ |
1182 | rcu_read_unlock(); |
1183 | } | |
1184 | ||
1185 | return total; | |
1186 | } | |
1187 | ||
1188 | static void tt_req_list_free(struct bat_priv *bat_priv) | |
1189 | { | |
1190 | struct tt_req_node *node, *safe; | |
1191 | ||
1192 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1193 | ||
1194 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
1195 | list_del(&node->list); | |
1196 | kfree(node); | |
1197 | } | |
1198 | ||
1199 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1200 | } | |
1201 | ||
de7aae65 SE |
1202 | static void tt_save_orig_buffer(struct bat_priv *bat_priv, |
1203 | struct orig_node *orig_node, | |
1204 | const unsigned char *tt_buff, | |
1205 | uint8_t tt_num_changes) | |
a73105b8 AQ |
1206 | { |
1207 | uint16_t tt_buff_len = tt_len(tt_num_changes); | |
1208 | ||
1209 | /* Replace the old buffer only if I received something in the | |
1210 | * last OGM (the OGM could carry no changes) */ | |
1211 | spin_lock_bh(&orig_node->tt_buff_lock); | |
1212 | if (tt_buff_len > 0) { | |
1213 | kfree(orig_node->tt_buff); | |
1214 | orig_node->tt_buff_len = 0; | |
1215 | orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); | |
1216 | if (orig_node->tt_buff) { | |
1217 | memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); | |
1218 | orig_node->tt_buff_len = tt_buff_len; | |
1219 | } | |
1220 | } | |
1221 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1222 | } | |
1223 | ||
1224 | static void tt_req_purge(struct bat_priv *bat_priv) | |
1225 | { | |
1226 | struct tt_req_node *node, *safe; | |
1227 | ||
1228 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1229 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
032b7969 | 1230 | if (has_timed_out(node->issued_at, TT_REQUEST_TIMEOUT)) { |
a73105b8 AQ |
1231 | list_del(&node->list); |
1232 | kfree(node); | |
1233 | } | |
1234 | } | |
1235 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1236 | } | |
1237 | ||
1238 | /* returns the pointer to the new tt_req_node struct if no request | |
1239 | * has already been issued for this orig_node, NULL otherwise */ | |
1240 | static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv, | |
1241 | struct orig_node *orig_node) | |
1242 | { | |
1243 | struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; | |
1244 | ||
1245 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1246 | list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) { | |
1247 | if (compare_eth(tt_req_node_tmp, orig_node) && | |
a04ccd59 | 1248 | !has_timed_out(tt_req_node_tmp->issued_at, |
032b7969 | 1249 | TT_REQUEST_TIMEOUT)) |
a73105b8 AQ |
1250 | goto unlock; |
1251 | } | |
1252 | ||
1253 | tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); | |
1254 | if (!tt_req_node) | |
1255 | goto unlock; | |
1256 | ||
1257 | memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); | |
1258 | tt_req_node->issued_at = jiffies; | |
1259 | ||
1260 | list_add(&tt_req_node->list, &bat_priv->tt_req_list); | |
1261 | unlock: | |
1262 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1263 | return tt_req_node; | |
1264 | } | |
1265 | ||
058d0e26 AQ |
1266 | /* data_ptr is useless here, but has to be kept to respect the prototype */ |
1267 | static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr) | |
1268 | { | |
48100bac | 1269 | const struct tt_common_entry *tt_common_entry = entry_ptr; |
058d0e26 | 1270 | |
48100bac | 1271 | if (tt_common_entry->flags & TT_CLIENT_NEW) |
058d0e26 AQ |
1272 | return 0; |
1273 | return 1; | |
1274 | } | |
1275 | ||
a73105b8 AQ |
1276 | static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr) |
1277 | { | |
48100bac AQ |
1278 | const struct tt_common_entry *tt_common_entry = entry_ptr; |
1279 | const struct tt_global_entry *tt_global_entry; | |
a73105b8 AQ |
1280 | const struct orig_node *orig_node = data_ptr; |
1281 | ||
48100bac | 1282 | if (tt_common_entry->flags & TT_CLIENT_ROAM) |
cc47f66e AQ |
1283 | return 0; |
1284 | ||
48100bac AQ |
1285 | tt_global_entry = container_of(tt_common_entry, struct tt_global_entry, |
1286 | common); | |
1287 | ||
db08e6e5 | 1288 | return tt_global_entry_has_orig(tt_global_entry, orig_node); |
a73105b8 AQ |
1289 | } |
1290 | ||
1291 | static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, | |
1292 | struct hashtable_t *hash, | |
1293 | struct hard_iface *primary_if, | |
1294 | int (*valid_cb)(const void *, | |
1295 | const void *), | |
1296 | void *cb_data) | |
1297 | { | |
48100bac | 1298 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
1299 | struct tt_query_packet *tt_response; |
1300 | struct tt_change *tt_change; | |
1301 | struct hlist_node *node; | |
1302 | struct hlist_head *head; | |
1303 | struct sk_buff *skb = NULL; | |
1304 | uint16_t tt_tot, tt_count; | |
1305 | ssize_t tt_query_size = sizeof(struct tt_query_packet); | |
c90681b8 | 1306 | uint32_t i; |
a73105b8 AQ |
1307 | |
1308 | if (tt_query_size + tt_len > primary_if->soft_iface->mtu) { | |
1309 | tt_len = primary_if->soft_iface->mtu - tt_query_size; | |
1310 | tt_len -= tt_len % sizeof(struct tt_change); | |
1311 | } | |
1312 | tt_tot = tt_len / sizeof(struct tt_change); | |
1313 | ||
1314 | skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN); | |
1315 | if (!skb) | |
1316 | goto out; | |
1317 | ||
1318 | skb_reserve(skb, ETH_HLEN); | |
1319 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1320 | tt_query_size + tt_len); | |
1321 | tt_response->ttvn = ttvn; | |
a73105b8 AQ |
1322 | |
1323 | tt_change = (struct tt_change *)(skb->data + tt_query_size); | |
1324 | tt_count = 0; | |
1325 | ||
1326 | rcu_read_lock(); | |
1327 | for (i = 0; i < hash->size; i++) { | |
1328 | head = &hash->table[i]; | |
1329 | ||
48100bac | 1330 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 AQ |
1331 | head, hash_entry) { |
1332 | if (tt_count == tt_tot) | |
1333 | break; | |
1334 | ||
48100bac | 1335 | if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data))) |
a73105b8 AQ |
1336 | continue; |
1337 | ||
48100bac AQ |
1338 | memcpy(tt_change->addr, tt_common_entry->addr, |
1339 | ETH_ALEN); | |
a73105b8 AQ |
1340 | tt_change->flags = NO_FLAGS; |
1341 | ||
1342 | tt_count++; | |
1343 | tt_change++; | |
1344 | } | |
1345 | } | |
1346 | rcu_read_unlock(); | |
1347 | ||
9d852393 AQ |
1348 | /* store in the message the number of entries we have successfully |
1349 | * copied */ | |
1350 | tt_response->tt_data = htons(tt_count); | |
1351 | ||
a73105b8 AQ |
1352 | out: |
1353 | return skb; | |
1354 | } | |
1355 | ||
a943cac1 ML |
1356 | static int send_tt_request(struct bat_priv *bat_priv, |
1357 | struct orig_node *dst_orig_node, | |
1358 | uint8_t ttvn, uint16_t tt_crc, bool full_table) | |
a73105b8 AQ |
1359 | { |
1360 | struct sk_buff *skb = NULL; | |
1361 | struct tt_query_packet *tt_request; | |
1362 | struct neigh_node *neigh_node = NULL; | |
1363 | struct hard_iface *primary_if; | |
1364 | struct tt_req_node *tt_req_node = NULL; | |
1365 | int ret = 1; | |
1366 | ||
1367 | primary_if = primary_if_get_selected(bat_priv); | |
1368 | if (!primary_if) | |
1369 | goto out; | |
1370 | ||
1371 | /* The new tt_req will be issued only if I'm not waiting for a | |
1372 | * reply from the same orig_node yet */ | |
1373 | tt_req_node = new_tt_req_node(bat_priv, dst_orig_node); | |
1374 | if (!tt_req_node) | |
1375 | goto out; | |
1376 | ||
1377 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN); | |
1378 | if (!skb) | |
1379 | goto out; | |
1380 | ||
1381 | skb_reserve(skb, ETH_HLEN); | |
1382 | ||
1383 | tt_request = (struct tt_query_packet *)skb_put(skb, | |
1384 | sizeof(struct tt_query_packet)); | |
1385 | ||
76543d14 SE |
1386 | tt_request->header.packet_type = BAT_TT_QUERY; |
1387 | tt_request->header.version = COMPAT_VERSION; | |
a73105b8 AQ |
1388 | memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1389 | memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN); | |
76543d14 | 1390 | tt_request->header.ttl = TTL; |
a73105b8 | 1391 | tt_request->ttvn = ttvn; |
6d2003fc | 1392 | tt_request->tt_data = htons(tt_crc); |
a73105b8 AQ |
1393 | tt_request->flags = TT_REQUEST; |
1394 | ||
1395 | if (full_table) | |
1396 | tt_request->flags |= TT_FULL_TABLE; | |
1397 | ||
1398 | neigh_node = orig_node_get_router(dst_orig_node); | |
1399 | if (!neigh_node) | |
1400 | goto out; | |
1401 | ||
86ceb360 SE |
1402 | bat_dbg(DBG_TT, bat_priv, |
1403 | "Sending TT_REQUEST to %pM via %pM [%c]\n", | |
1404 | dst_orig_node->orig, neigh_node->addr, | |
a73105b8 AQ |
1405 | (full_table ? 'F' : '.')); |
1406 | ||
f8214865 MH |
1407 | batadv_inc_counter(bat_priv, BAT_CNT_TT_REQUEST_TX); |
1408 | ||
a73105b8 AQ |
1409 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
1410 | ret = 0; | |
1411 | ||
1412 | out: | |
1413 | if (neigh_node) | |
1414 | neigh_node_free_ref(neigh_node); | |
1415 | if (primary_if) | |
1416 | hardif_free_ref(primary_if); | |
1417 | if (ret) | |
1418 | kfree_skb(skb); | |
1419 | if (ret && tt_req_node) { | |
1420 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1421 | list_del(&tt_req_node->list); | |
1422 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1423 | kfree(tt_req_node); | |
1424 | } | |
1425 | return ret; | |
1426 | } | |
1427 | ||
1428 | static bool send_other_tt_response(struct bat_priv *bat_priv, | |
1429 | struct tt_query_packet *tt_request) | |
1430 | { | |
1431 | struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL; | |
1432 | struct neigh_node *neigh_node = NULL; | |
1433 | struct hard_iface *primary_if = NULL; | |
1434 | uint8_t orig_ttvn, req_ttvn, ttvn; | |
1435 | int ret = false; | |
1436 | unsigned char *tt_buff; | |
1437 | bool full_table; | |
1438 | uint16_t tt_len, tt_tot; | |
1439 | struct sk_buff *skb = NULL; | |
1440 | struct tt_query_packet *tt_response; | |
1441 | ||
1442 | bat_dbg(DBG_TT, bat_priv, | |
86ceb360 SE |
1443 | "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", |
1444 | tt_request->src, tt_request->ttvn, tt_request->dst, | |
a73105b8 AQ |
1445 | (tt_request->flags & TT_FULL_TABLE ? 'F' : '.')); |
1446 | ||
1447 | /* Let's get the orig node of the REAL destination */ | |
eb7e2a1e | 1448 | req_dst_orig_node = orig_hash_find(bat_priv, tt_request->dst); |
a73105b8 AQ |
1449 | if (!req_dst_orig_node) |
1450 | goto out; | |
1451 | ||
eb7e2a1e | 1452 | res_dst_orig_node = orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1453 | if (!res_dst_orig_node) |
1454 | goto out; | |
1455 | ||
1456 | neigh_node = orig_node_get_router(res_dst_orig_node); | |
1457 | if (!neigh_node) | |
1458 | goto out; | |
1459 | ||
1460 | primary_if = primary_if_get_selected(bat_priv); | |
1461 | if (!primary_if) | |
1462 | goto out; | |
1463 | ||
1464 | orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1465 | req_ttvn = tt_request->ttvn; | |
1466 | ||
015758d0 | 1467 | /* I don't have the requested data */ |
a73105b8 | 1468 | if (orig_ttvn != req_ttvn || |
f25bd58a | 1469 | tt_request->tt_data != htons(req_dst_orig_node->tt_crc)) |
a73105b8 AQ |
1470 | goto out; |
1471 | ||
015758d0 | 1472 | /* If the full table has been explicitly requested */ |
a73105b8 AQ |
1473 | if (tt_request->flags & TT_FULL_TABLE || |
1474 | !req_dst_orig_node->tt_buff) | |
1475 | full_table = true; | |
1476 | else | |
1477 | full_table = false; | |
1478 | ||
1479 | /* In this version, fragmentation is not implemented, then | |
1480 | * I'll send only one packet with as much TT entries as I can */ | |
1481 | if (!full_table) { | |
1482 | spin_lock_bh(&req_dst_orig_node->tt_buff_lock); | |
1483 | tt_len = req_dst_orig_node->tt_buff_len; | |
1484 | tt_tot = tt_len / sizeof(struct tt_change); | |
1485 | ||
1486 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + | |
1487 | tt_len + ETH_HLEN); | |
1488 | if (!skb) | |
1489 | goto unlock; | |
1490 | ||
1491 | skb_reserve(skb, ETH_HLEN); | |
1492 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1493 | sizeof(struct tt_query_packet) + tt_len); | |
1494 | tt_response->ttvn = req_ttvn; | |
1495 | tt_response->tt_data = htons(tt_tot); | |
1496 | ||
1497 | tt_buff = skb->data + sizeof(struct tt_query_packet); | |
1498 | /* Copy the last orig_node's OGM buffer */ | |
1499 | memcpy(tt_buff, req_dst_orig_node->tt_buff, | |
1500 | req_dst_orig_node->tt_buff_len); | |
1501 | ||
1502 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1503 | } else { | |
1504 | tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) * | |
1505 | sizeof(struct tt_change); | |
1506 | ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1507 | ||
1508 | skb = tt_response_fill_table(tt_len, ttvn, | |
1509 | bat_priv->tt_global_hash, | |
1510 | primary_if, tt_global_valid_entry, | |
1511 | req_dst_orig_node); | |
1512 | if (!skb) | |
1513 | goto out; | |
1514 | ||
1515 | tt_response = (struct tt_query_packet *)skb->data; | |
1516 | } | |
1517 | ||
76543d14 SE |
1518 | tt_response->header.packet_type = BAT_TT_QUERY; |
1519 | tt_response->header.version = COMPAT_VERSION; | |
1520 | tt_response->header.ttl = TTL; | |
a73105b8 AQ |
1521 | memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN); |
1522 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
1523 | tt_response->flags = TT_RESPONSE; | |
1524 | ||
1525 | if (full_table) | |
1526 | tt_response->flags |= TT_FULL_TABLE; | |
1527 | ||
1528 | bat_dbg(DBG_TT, bat_priv, | |
1529 | "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n", | |
1530 | res_dst_orig_node->orig, neigh_node->addr, | |
1531 | req_dst_orig_node->orig, req_ttvn); | |
1532 | ||
f8214865 MH |
1533 | batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_TX); |
1534 | ||
a73105b8 AQ |
1535 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
1536 | ret = true; | |
1537 | goto out; | |
1538 | ||
1539 | unlock: | |
1540 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1541 | ||
1542 | out: | |
1543 | if (res_dst_orig_node) | |
1544 | orig_node_free_ref(res_dst_orig_node); | |
1545 | if (req_dst_orig_node) | |
1546 | orig_node_free_ref(req_dst_orig_node); | |
1547 | if (neigh_node) | |
1548 | neigh_node_free_ref(neigh_node); | |
1549 | if (primary_if) | |
1550 | hardif_free_ref(primary_if); | |
1551 | if (!ret) | |
1552 | kfree_skb(skb); | |
1553 | return ret; | |
1554 | ||
1555 | } | |
1556 | static bool send_my_tt_response(struct bat_priv *bat_priv, | |
1557 | struct tt_query_packet *tt_request) | |
1558 | { | |
1559 | struct orig_node *orig_node = NULL; | |
1560 | struct neigh_node *neigh_node = NULL; | |
1561 | struct hard_iface *primary_if = NULL; | |
1562 | uint8_t my_ttvn, req_ttvn, ttvn; | |
1563 | int ret = false; | |
1564 | unsigned char *tt_buff; | |
1565 | bool full_table; | |
1566 | uint16_t tt_len, tt_tot; | |
1567 | struct sk_buff *skb = NULL; | |
1568 | struct tt_query_packet *tt_response; | |
1569 | ||
1570 | bat_dbg(DBG_TT, bat_priv, | |
86ceb360 SE |
1571 | "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", |
1572 | tt_request->src, tt_request->ttvn, | |
a73105b8 AQ |
1573 | (tt_request->flags & TT_FULL_TABLE ? 'F' : '.')); |
1574 | ||
1575 | ||
1576 | my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1577 | req_ttvn = tt_request->ttvn; | |
1578 | ||
eb7e2a1e | 1579 | orig_node = orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1580 | if (!orig_node) |
1581 | goto out; | |
1582 | ||
1583 | neigh_node = orig_node_get_router(orig_node); | |
1584 | if (!neigh_node) | |
1585 | goto out; | |
1586 | ||
1587 | primary_if = primary_if_get_selected(bat_priv); | |
1588 | if (!primary_if) | |
1589 | goto out; | |
1590 | ||
1591 | /* If the full table has been explicitly requested or the gap | |
1592 | * is too big send the whole local translation table */ | |
1593 | if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn || | |
1594 | !bat_priv->tt_buff) | |
1595 | full_table = true; | |
1596 | else | |
1597 | full_table = false; | |
1598 | ||
1599 | /* In this version, fragmentation is not implemented, then | |
1600 | * I'll send only one packet with as much TT entries as I can */ | |
1601 | if (!full_table) { | |
1602 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
1603 | tt_len = bat_priv->tt_buff_len; | |
1604 | tt_tot = tt_len / sizeof(struct tt_change); | |
1605 | ||
1606 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + | |
1607 | tt_len + ETH_HLEN); | |
1608 | if (!skb) | |
1609 | goto unlock; | |
1610 | ||
1611 | skb_reserve(skb, ETH_HLEN); | |
1612 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1613 | sizeof(struct tt_query_packet) + tt_len); | |
1614 | tt_response->ttvn = req_ttvn; | |
1615 | tt_response->tt_data = htons(tt_tot); | |
1616 | ||
1617 | tt_buff = skb->data + sizeof(struct tt_query_packet); | |
1618 | memcpy(tt_buff, bat_priv->tt_buff, | |
1619 | bat_priv->tt_buff_len); | |
1620 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1621 | } else { | |
1622 | tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) * | |
1623 | sizeof(struct tt_change); | |
1624 | ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1625 | ||
1626 | skb = tt_response_fill_table(tt_len, ttvn, | |
1627 | bat_priv->tt_local_hash, | |
058d0e26 AQ |
1628 | primary_if, tt_local_valid_entry, |
1629 | NULL); | |
a73105b8 AQ |
1630 | if (!skb) |
1631 | goto out; | |
1632 | ||
1633 | tt_response = (struct tt_query_packet *)skb->data; | |
1634 | } | |
1635 | ||
76543d14 SE |
1636 | tt_response->header.packet_type = BAT_TT_QUERY; |
1637 | tt_response->header.version = COMPAT_VERSION; | |
1638 | tt_response->header.ttl = TTL; | |
a73105b8 AQ |
1639 | memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1640 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
1641 | tt_response->flags = TT_RESPONSE; | |
1642 | ||
1643 | if (full_table) | |
1644 | tt_response->flags |= TT_FULL_TABLE; | |
1645 | ||
1646 | bat_dbg(DBG_TT, bat_priv, | |
1647 | "Sending TT_RESPONSE to %pM via %pM [%c]\n", | |
1648 | orig_node->orig, neigh_node->addr, | |
1649 | (tt_response->flags & TT_FULL_TABLE ? 'F' : '.')); | |
1650 | ||
f8214865 MH |
1651 | batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_TX); |
1652 | ||
a73105b8 AQ |
1653 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
1654 | ret = true; | |
1655 | goto out; | |
1656 | ||
1657 | unlock: | |
1658 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1659 | out: | |
1660 | if (orig_node) | |
1661 | orig_node_free_ref(orig_node); | |
1662 | if (neigh_node) | |
1663 | neigh_node_free_ref(neigh_node); | |
1664 | if (primary_if) | |
1665 | hardif_free_ref(primary_if); | |
1666 | if (!ret) | |
1667 | kfree_skb(skb); | |
1668 | /* This packet was for me, so it doesn't need to be re-routed */ | |
1669 | return true; | |
1670 | } | |
1671 | ||
1672 | bool send_tt_response(struct bat_priv *bat_priv, | |
1673 | struct tt_query_packet *tt_request) | |
1674 | { | |
20ff9d59 SW |
1675 | if (is_my_mac(tt_request->dst)) { |
1676 | /* don't answer backbone gws! */ | |
08adf151 | 1677 | if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src)) |
20ff9d59 SW |
1678 | return true; |
1679 | ||
a73105b8 | 1680 | return send_my_tt_response(bat_priv, tt_request); |
20ff9d59 | 1681 | } else { |
a73105b8 | 1682 | return send_other_tt_response(bat_priv, tt_request); |
20ff9d59 | 1683 | } |
a73105b8 AQ |
1684 | } |
1685 | ||
1686 | static void _tt_update_changes(struct bat_priv *bat_priv, | |
1687 | struct orig_node *orig_node, | |
1688 | struct tt_change *tt_change, | |
1689 | uint16_t tt_num_changes, uint8_t ttvn) | |
1690 | { | |
1691 | int i; | |
1692 | ||
1693 | for (i = 0; i < tt_num_changes; i++) { | |
5fbc1598 | 1694 | if ((tt_change + i)->flags & TT_CLIENT_DEL) |
a73105b8 AQ |
1695 | tt_global_del(bat_priv, orig_node, |
1696 | (tt_change + i)->addr, | |
cc47f66e AQ |
1697 | "tt removed by changes", |
1698 | (tt_change + i)->flags & TT_CLIENT_ROAM); | |
a73105b8 AQ |
1699 | else |
1700 | if (!tt_global_add(bat_priv, orig_node, | |
bc279080 AQ |
1701 | (tt_change + i)->addr, ttvn, false, |
1702 | (tt_change + i)->flags & | |
1703 | TT_CLIENT_WIFI)) | |
a73105b8 AQ |
1704 | /* In case of problem while storing a |
1705 | * global_entry, we stop the updating | |
1706 | * procedure without committing the | |
1707 | * ttvn change. This will avoid to send | |
1708 | * corrupted data on tt_request | |
1709 | */ | |
1710 | return; | |
1711 | } | |
17071578 | 1712 | orig_node->tt_initialised = true; |
a73105b8 AQ |
1713 | } |
1714 | ||
1715 | static void tt_fill_gtable(struct bat_priv *bat_priv, | |
1716 | struct tt_query_packet *tt_response) | |
1717 | { | |
1718 | struct orig_node *orig_node = NULL; | |
1719 | ||
1720 | orig_node = orig_hash_find(bat_priv, tt_response->src); | |
1721 | if (!orig_node) | |
1722 | goto out; | |
1723 | ||
1724 | /* Purge the old table first.. */ | |
1725 | tt_global_del_orig(bat_priv, orig_node, "Received full table"); | |
1726 | ||
1727 | _tt_update_changes(bat_priv, orig_node, | |
1728 | (struct tt_change *)(tt_response + 1), | |
f25bd58a | 1729 | ntohs(tt_response->tt_data), tt_response->ttvn); |
a73105b8 AQ |
1730 | |
1731 | spin_lock_bh(&orig_node->tt_buff_lock); | |
1732 | kfree(orig_node->tt_buff); | |
1733 | orig_node->tt_buff_len = 0; | |
1734 | orig_node->tt_buff = NULL; | |
1735 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1736 | ||
1737 | atomic_set(&orig_node->last_ttvn, tt_response->ttvn); | |
1738 | ||
1739 | out: | |
1740 | if (orig_node) | |
1741 | orig_node_free_ref(orig_node); | |
1742 | } | |
1743 | ||
a943cac1 ML |
1744 | static void tt_update_changes(struct bat_priv *bat_priv, |
1745 | struct orig_node *orig_node, | |
1746 | uint16_t tt_num_changes, uint8_t ttvn, | |
1747 | struct tt_change *tt_change) | |
a73105b8 AQ |
1748 | { |
1749 | _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes, | |
1750 | ttvn); | |
1751 | ||
1752 | tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change, | |
1753 | tt_num_changes); | |
1754 | atomic_set(&orig_node->last_ttvn, ttvn); | |
1755 | } | |
1756 | ||
1757 | bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr) | |
1758 | { | |
7683fdc1 AQ |
1759 | struct tt_local_entry *tt_local_entry = NULL; |
1760 | bool ret = false; | |
a73105b8 | 1761 | |
a73105b8 | 1762 | tt_local_entry = tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
1763 | if (!tt_local_entry) |
1764 | goto out; | |
058d0e26 AQ |
1765 | /* Check if the client has been logically deleted (but is kept for |
1766 | * consistency purpose) */ | |
48100bac | 1767 | if (tt_local_entry->common.flags & TT_CLIENT_PENDING) |
058d0e26 | 1768 | goto out; |
7683fdc1 AQ |
1769 | ret = true; |
1770 | out: | |
a73105b8 | 1771 | if (tt_local_entry) |
7683fdc1 AQ |
1772 | tt_local_entry_free_ref(tt_local_entry); |
1773 | return ret; | |
a73105b8 AQ |
1774 | } |
1775 | ||
1776 | void handle_tt_response(struct bat_priv *bat_priv, | |
1777 | struct tt_query_packet *tt_response) | |
1778 | { | |
1779 | struct tt_req_node *node, *safe; | |
1780 | struct orig_node *orig_node = NULL; | |
1781 | ||
86ceb360 SE |
1782 | bat_dbg(DBG_TT, bat_priv, |
1783 | "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", | |
f25bd58a AV |
1784 | tt_response->src, tt_response->ttvn, |
1785 | ntohs(tt_response->tt_data), | |
a73105b8 AQ |
1786 | (tt_response->flags & TT_FULL_TABLE ? 'F' : '.')); |
1787 | ||
20ff9d59 | 1788 | /* we should have never asked a backbone gw */ |
08adf151 | 1789 | if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src)) |
20ff9d59 SW |
1790 | goto out; |
1791 | ||
a73105b8 AQ |
1792 | orig_node = orig_hash_find(bat_priv, tt_response->src); |
1793 | if (!orig_node) | |
1794 | goto out; | |
1795 | ||
1796 | if (tt_response->flags & TT_FULL_TABLE) | |
1797 | tt_fill_gtable(bat_priv, tt_response); | |
1798 | else | |
f25bd58a AV |
1799 | tt_update_changes(bat_priv, orig_node, |
1800 | ntohs(tt_response->tt_data), | |
a73105b8 AQ |
1801 | tt_response->ttvn, |
1802 | (struct tt_change *)(tt_response + 1)); | |
1803 | ||
1804 | /* Delete the tt_req_node from pending tt_requests list */ | |
1805 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1806 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
1807 | if (!compare_eth(node->addr, tt_response->src)) | |
1808 | continue; | |
1809 | list_del(&node->list); | |
1810 | kfree(node); | |
1811 | } | |
1812 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1813 | ||
1814 | /* Recalculate the CRC for this orig_node and store it */ | |
a73105b8 | 1815 | orig_node->tt_crc = tt_global_crc(bat_priv, orig_node); |
cc47f66e AQ |
1816 | /* Roaming phase is over: tables are in sync again. I can |
1817 | * unset the flag */ | |
1818 | orig_node->tt_poss_change = false; | |
a73105b8 AQ |
1819 | out: |
1820 | if (orig_node) | |
1821 | orig_node_free_ref(orig_node); | |
1822 | } | |
1823 | ||
1824 | int tt_init(struct bat_priv *bat_priv) | |
1825 | { | |
5346c35e | 1826 | int ret; |
a73105b8 | 1827 | |
5346c35e SE |
1828 | ret = tt_local_init(bat_priv); |
1829 | if (ret < 0) | |
1830 | return ret; | |
1831 | ||
1832 | ret = tt_global_init(bat_priv); | |
1833 | if (ret < 0) | |
1834 | return ret; | |
a73105b8 AQ |
1835 | |
1836 | tt_start_timer(bat_priv); | |
1837 | ||
1838 | return 1; | |
1839 | } | |
1840 | ||
cc47f66e | 1841 | static void tt_roam_list_free(struct bat_priv *bat_priv) |
a73105b8 | 1842 | { |
cc47f66e | 1843 | struct tt_roam_node *node, *safe; |
a73105b8 | 1844 | |
cc47f66e | 1845 | spin_lock_bh(&bat_priv->tt_roam_list_lock); |
a73105b8 | 1846 | |
cc47f66e AQ |
1847 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { |
1848 | list_del(&node->list); | |
1849 | kfree(node); | |
1850 | } | |
1851 | ||
1852 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1853 | } | |
1854 | ||
1855 | static void tt_roam_purge(struct bat_priv *bat_priv) | |
1856 | { | |
1857 | struct tt_roam_node *node, *safe; | |
1858 | ||
1859 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1860 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { | |
032b7969 | 1861 | if (!has_timed_out(node->first_time, ROAMING_MAX_TIME)) |
cc47f66e AQ |
1862 | continue; |
1863 | ||
1864 | list_del(&node->list); | |
1865 | kfree(node); | |
1866 | } | |
1867 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1868 | } | |
1869 | ||
1870 | /* This function checks whether the client already reached the | |
1871 | * maximum number of possible roaming phases. In this case the ROAMING_ADV | |
1872 | * will not be sent. | |
1873 | * | |
1874 | * returns true if the ROAMING_ADV can be sent, false otherwise */ | |
1875 | static bool tt_check_roam_count(struct bat_priv *bat_priv, | |
1876 | uint8_t *client) | |
1877 | { | |
1878 | struct tt_roam_node *tt_roam_node; | |
1879 | bool ret = false; | |
1880 | ||
1881 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1882 | /* The new tt_req will be issued only if I'm not waiting for a | |
1883 | * reply from the same orig_node yet */ | |
1884 | list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) { | |
1885 | if (!compare_eth(tt_roam_node->addr, client)) | |
1886 | continue; | |
1887 | ||
032b7969 | 1888 | if (has_timed_out(tt_roam_node->first_time, ROAMING_MAX_TIME)) |
cc47f66e AQ |
1889 | continue; |
1890 | ||
1891 | if (!atomic_dec_not_zero(&tt_roam_node->counter)) | |
1892 | /* Sorry, you roamed too many times! */ | |
1893 | goto unlock; | |
1894 | ret = true; | |
1895 | break; | |
1896 | } | |
1897 | ||
1898 | if (!ret) { | |
1899 | tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); | |
1900 | if (!tt_roam_node) | |
1901 | goto unlock; | |
1902 | ||
1903 | tt_roam_node->first_time = jiffies; | |
1904 | atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1); | |
1905 | memcpy(tt_roam_node->addr, client, ETH_ALEN); | |
1906 | ||
1907 | list_add(&tt_roam_node->list, &bat_priv->tt_roam_list); | |
1908 | ret = true; | |
1909 | } | |
1910 | ||
1911 | unlock: | |
1912 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1913 | return ret; | |
1914 | } | |
1915 | ||
de7aae65 SE |
1916 | static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client, |
1917 | struct orig_node *orig_node) | |
cc47f66e AQ |
1918 | { |
1919 | struct neigh_node *neigh_node = NULL; | |
1920 | struct sk_buff *skb = NULL; | |
1921 | struct roam_adv_packet *roam_adv_packet; | |
1922 | int ret = 1; | |
1923 | struct hard_iface *primary_if; | |
1924 | ||
1925 | /* before going on we have to check whether the client has | |
1926 | * already roamed to us too many times */ | |
1927 | if (!tt_check_roam_count(bat_priv, client)) | |
1928 | goto out; | |
1929 | ||
1930 | skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN); | |
1931 | if (!skb) | |
1932 | goto out; | |
1933 | ||
1934 | skb_reserve(skb, ETH_HLEN); | |
1935 | ||
1936 | roam_adv_packet = (struct roam_adv_packet *)skb_put(skb, | |
1937 | sizeof(struct roam_adv_packet)); | |
1938 | ||
76543d14 SE |
1939 | roam_adv_packet->header.packet_type = BAT_ROAM_ADV; |
1940 | roam_adv_packet->header.version = COMPAT_VERSION; | |
1941 | roam_adv_packet->header.ttl = TTL; | |
cc47f66e AQ |
1942 | primary_if = primary_if_get_selected(bat_priv); |
1943 | if (!primary_if) | |
1944 | goto out; | |
1945 | memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN); | |
1946 | hardif_free_ref(primary_if); | |
1947 | memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN); | |
1948 | memcpy(roam_adv_packet->client, client, ETH_ALEN); | |
1949 | ||
1950 | neigh_node = orig_node_get_router(orig_node); | |
1951 | if (!neigh_node) | |
1952 | goto out; | |
1953 | ||
1954 | bat_dbg(DBG_TT, bat_priv, | |
1955 | "Sending ROAMING_ADV to %pM (client %pM) via %pM\n", | |
1956 | orig_node->orig, client, neigh_node->addr); | |
1957 | ||
f8214865 MH |
1958 | batadv_inc_counter(bat_priv, BAT_CNT_TT_ROAM_ADV_TX); |
1959 | ||
cc47f66e AQ |
1960 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
1961 | ret = 0; | |
1962 | ||
1963 | out: | |
1964 | if (neigh_node) | |
1965 | neigh_node_free_ref(neigh_node); | |
1966 | if (ret) | |
1967 | kfree_skb(skb); | |
1968 | return; | |
a73105b8 AQ |
1969 | } |
1970 | ||
1971 | static void tt_purge(struct work_struct *work) | |
1972 | { | |
1973 | struct delayed_work *delayed_work = | |
1974 | container_of(work, struct delayed_work, work); | |
1975 | struct bat_priv *bat_priv = | |
1976 | container_of(delayed_work, struct bat_priv, tt_work); | |
1977 | ||
1978 | tt_local_purge(bat_priv); | |
cc47f66e | 1979 | tt_global_roam_purge(bat_priv); |
a73105b8 | 1980 | tt_req_purge(bat_priv); |
cc47f66e | 1981 | tt_roam_purge(bat_priv); |
a73105b8 AQ |
1982 | |
1983 | tt_start_timer(bat_priv); | |
1984 | } | |
cc47f66e AQ |
1985 | |
1986 | void tt_free(struct bat_priv *bat_priv) | |
1987 | { | |
1988 | cancel_delayed_work_sync(&bat_priv->tt_work); | |
1989 | ||
1990 | tt_local_table_free(bat_priv); | |
1991 | tt_global_table_free(bat_priv); | |
1992 | tt_req_list_free(bat_priv); | |
1993 | tt_changes_list_free(bat_priv); | |
1994 | tt_roam_list_free(bat_priv); | |
1995 | ||
1996 | kfree(bat_priv->tt_buff); | |
1997 | } | |
058d0e26 | 1998 | |
697f2531 AQ |
1999 | /* This function will enable or disable the specified flags for all the entries |
2000 | * in the given hash table and returns the number of modified entries */ | |
2001 | static uint16_t tt_set_flags(struct hashtable_t *hash, uint16_t flags, | |
2002 | bool enable) | |
058d0e26 | 2003 | { |
c90681b8 | 2004 | uint32_t i; |
697f2531 | 2005 | uint16_t changed_num = 0; |
058d0e26 AQ |
2006 | struct hlist_head *head; |
2007 | struct hlist_node *node; | |
48100bac | 2008 | struct tt_common_entry *tt_common_entry; |
058d0e26 AQ |
2009 | |
2010 | if (!hash) | |
697f2531 | 2011 | goto out; |
058d0e26 AQ |
2012 | |
2013 | for (i = 0; i < hash->size; i++) { | |
2014 | head = &hash->table[i]; | |
2015 | ||
2016 | rcu_read_lock(); | |
48100bac | 2017 | hlist_for_each_entry_rcu(tt_common_entry, node, |
058d0e26 | 2018 | head, hash_entry) { |
697f2531 AQ |
2019 | if (enable) { |
2020 | if ((tt_common_entry->flags & flags) == flags) | |
2021 | continue; | |
2022 | tt_common_entry->flags |= flags; | |
2023 | } else { | |
2024 | if (!(tt_common_entry->flags & flags)) | |
2025 | continue; | |
2026 | tt_common_entry->flags &= ~flags; | |
2027 | } | |
2028 | changed_num++; | |
058d0e26 AQ |
2029 | } |
2030 | rcu_read_unlock(); | |
2031 | } | |
697f2531 AQ |
2032 | out: |
2033 | return changed_num; | |
058d0e26 AQ |
2034 | } |
2035 | ||
2036 | /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */ | |
2037 | static void tt_local_purge_pending_clients(struct bat_priv *bat_priv) | |
2038 | { | |
2039 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
48100bac | 2040 | struct tt_common_entry *tt_common_entry; |
058d0e26 AQ |
2041 | struct tt_local_entry *tt_local_entry; |
2042 | struct hlist_node *node, *node_tmp; | |
2043 | struct hlist_head *head; | |
2044 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
c90681b8 | 2045 | uint32_t i; |
058d0e26 AQ |
2046 | |
2047 | if (!hash) | |
2048 | return; | |
2049 | ||
2050 | for (i = 0; i < hash->size; i++) { | |
2051 | head = &hash->table[i]; | |
2052 | list_lock = &hash->list_locks[i]; | |
2053 | ||
2054 | spin_lock_bh(list_lock); | |
48100bac | 2055 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
058d0e26 | 2056 | head, hash_entry) { |
48100bac | 2057 | if (!(tt_common_entry->flags & TT_CLIENT_PENDING)) |
058d0e26 AQ |
2058 | continue; |
2059 | ||
86ceb360 SE |
2060 | bat_dbg(DBG_TT, bat_priv, |
2061 | "Deleting local tt entry (%pM): pending\n", | |
2062 | tt_common_entry->addr); | |
058d0e26 AQ |
2063 | |
2064 | atomic_dec(&bat_priv->num_local_tt); | |
2065 | hlist_del_rcu(node); | |
48100bac AQ |
2066 | tt_local_entry = container_of(tt_common_entry, |
2067 | struct tt_local_entry, | |
2068 | common); | |
058d0e26 AQ |
2069 | tt_local_entry_free_ref(tt_local_entry); |
2070 | } | |
2071 | spin_unlock_bh(list_lock); | |
2072 | } | |
2073 | ||
2074 | } | |
2075 | ||
be9aa4c1 ML |
2076 | static int tt_commit_changes(struct bat_priv *bat_priv, |
2077 | unsigned char **packet_buff, int *packet_buff_len, | |
2078 | int packet_min_len) | |
058d0e26 | 2079 | { |
be9aa4c1 ML |
2080 | uint16_t changed_num = 0; |
2081 | ||
2082 | if (atomic_read(&bat_priv->tt_local_changes) < 1) | |
2083 | return -ENOENT; | |
2084 | ||
2085 | changed_num = tt_set_flags(bat_priv->tt_local_hash, | |
2086 | TT_CLIENT_NEW, false); | |
2087 | ||
2088 | /* all reset entries have to be counted as local entries */ | |
697f2531 | 2089 | atomic_add(changed_num, &bat_priv->num_local_tt); |
058d0e26 | 2090 | tt_local_purge_pending_clients(bat_priv); |
be9aa4c1 | 2091 | bat_priv->tt_crc = batadv_tt_local_crc(bat_priv); |
058d0e26 AQ |
2092 | |
2093 | /* Increment the TTVN only once per OGM interval */ | |
2094 | atomic_inc(&bat_priv->ttvn); | |
db08e6e5 SW |
2095 | bat_dbg(DBG_TT, bat_priv, "Local changes committed, updating to ttvn %u\n", |
2096 | (uint8_t)atomic_read(&bat_priv->ttvn)); | |
058d0e26 | 2097 | bat_priv->tt_poss_change = false; |
be9aa4c1 ML |
2098 | |
2099 | /* reset the sending counter */ | |
2100 | atomic_set(&bat_priv->tt_ogm_append_cnt, TT_OGM_APPEND_MAX); | |
2101 | ||
2102 | return tt_changes_fill_buff(bat_priv, packet_buff, | |
2103 | packet_buff_len, packet_min_len); | |
2104 | } | |
2105 | ||
2106 | /* when calling this function (hard_iface == primary_if) has to be true */ | |
2107 | int batadv_tt_append_diff(struct bat_priv *bat_priv, | |
2108 | unsigned char **packet_buff, int *packet_buff_len, | |
2109 | int packet_min_len) | |
2110 | { | |
2111 | int tt_num_changes; | |
2112 | ||
2113 | /* if at least one change happened */ | |
2114 | tt_num_changes = tt_commit_changes(bat_priv, packet_buff, | |
2115 | packet_buff_len, packet_min_len); | |
2116 | ||
2117 | /* if the changes have been sent often enough */ | |
2118 | if ((tt_num_changes < 0) && | |
2119 | (!atomic_dec_not_zero(&bat_priv->tt_ogm_append_cnt))) { | |
2120 | tt_realloc_packet_buff(packet_buff, packet_buff_len, | |
2121 | packet_min_len, packet_min_len); | |
2122 | tt_num_changes = 0; | |
2123 | } | |
2124 | ||
2125 | return tt_num_changes; | |
058d0e26 | 2126 | } |
59b699cd AQ |
2127 | |
2128 | bool is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, uint8_t *dst) | |
2129 | { | |
2130 | struct tt_local_entry *tt_local_entry = NULL; | |
2131 | struct tt_global_entry *tt_global_entry = NULL; | |
2132 | bool ret = true; | |
2133 | ||
2134 | if (!atomic_read(&bat_priv->ap_isolation)) | |
2135 | return false; | |
2136 | ||
2137 | tt_local_entry = tt_local_hash_find(bat_priv, dst); | |
2138 | if (!tt_local_entry) | |
2139 | goto out; | |
2140 | ||
2141 | tt_global_entry = tt_global_hash_find(bat_priv, src); | |
2142 | if (!tt_global_entry) | |
2143 | goto out; | |
2144 | ||
2145 | if (_is_ap_isolated(tt_local_entry, tt_global_entry)) | |
2146 | goto out; | |
2147 | ||
2148 | ret = false; | |
2149 | ||
2150 | out: | |
2151 | if (tt_global_entry) | |
2152 | tt_global_entry_free_ref(tt_global_entry); | |
2153 | if (tt_local_entry) | |
2154 | tt_local_entry_free_ref(tt_local_entry); | |
2155 | return ret; | |
2156 | } | |
a943cac1 ML |
2157 | |
2158 | void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
2159 | const unsigned char *tt_buff, uint8_t tt_num_changes, | |
2160 | uint8_t ttvn, uint16_t tt_crc) | |
2161 | { | |
2162 | uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
2163 | bool full_table = true; | |
2164 | ||
20ff9d59 | 2165 | /* don't care about a backbone gateways updates. */ |
08adf151 | 2166 | if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) |
20ff9d59 SW |
2167 | return; |
2168 | ||
17071578 AQ |
2169 | /* orig table not initialised AND first diff is in the OGM OR the ttvn |
2170 | * increased by one -> we can apply the attached changes */ | |
2171 | if ((!orig_node->tt_initialised && ttvn == 1) || | |
2172 | ttvn - orig_ttvn == 1) { | |
a943cac1 ML |
2173 | /* the OGM could not contain the changes due to their size or |
2174 | * because they have already been sent TT_OGM_APPEND_MAX times. | |
2175 | * In this case send a tt request */ | |
2176 | if (!tt_num_changes) { | |
2177 | full_table = false; | |
2178 | goto request_table; | |
2179 | } | |
2180 | ||
2181 | tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn, | |
2182 | (struct tt_change *)tt_buff); | |
2183 | ||
2184 | /* Even if we received the precomputed crc with the OGM, we | |
2185 | * prefer to recompute it to spot any possible inconsistency | |
2186 | * in the global table */ | |
2187 | orig_node->tt_crc = tt_global_crc(bat_priv, orig_node); | |
2188 | ||
2189 | /* The ttvn alone is not enough to guarantee consistency | |
2190 | * because a single value could represent different states | |
2191 | * (due to the wrap around). Thus a node has to check whether | |
2192 | * the resulting table (after applying the changes) is still | |
2193 | * consistent or not. E.g. a node could disconnect while its | |
2194 | * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case | |
2195 | * checking the CRC value is mandatory to detect the | |
2196 | * inconsistency */ | |
2197 | if (orig_node->tt_crc != tt_crc) | |
2198 | goto request_table; | |
2199 | ||
2200 | /* Roaming phase is over: tables are in sync again. I can | |
2201 | * unset the flag */ | |
2202 | orig_node->tt_poss_change = false; | |
2203 | } else { | |
2204 | /* if we missed more than one change or our tables are not | |
2205 | * in sync anymore -> request fresh tt data */ | |
db08e6e5 | 2206 | |
17071578 AQ |
2207 | if (!orig_node->tt_initialised || ttvn != orig_ttvn || |
2208 | orig_node->tt_crc != tt_crc) { | |
a943cac1 | 2209 | request_table: |
86ceb360 SE |
2210 | bat_dbg(DBG_TT, bat_priv, |
2211 | "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n", | |
2212 | orig_node->orig, ttvn, orig_ttvn, tt_crc, | |
2213 | orig_node->tt_crc, tt_num_changes); | |
a943cac1 ML |
2214 | send_tt_request(bat_priv, orig_node, ttvn, tt_crc, |
2215 | full_table); | |
2216 | return; | |
2217 | } | |
2218 | } | |
2219 | } | |
3275e7cc AQ |
2220 | |
2221 | /* returns true whether we know that the client has moved from its old | |
2222 | * originator to another one. This entry is kept is still kept for consistency | |
2223 | * purposes | |
2224 | */ | |
2225 | bool tt_global_client_is_roaming(struct bat_priv *bat_priv, uint8_t *addr) | |
2226 | { | |
2227 | struct tt_global_entry *tt_global_entry; | |
2228 | bool ret = false; | |
2229 | ||
2230 | tt_global_entry = tt_global_hash_find(bat_priv, addr); | |
2231 | if (!tt_global_entry) | |
2232 | goto out; | |
2233 | ||
2234 | ret = tt_global_entry->common.flags & TT_CLIENT_ROAM; | |
2235 | tt_global_entry_free_ref(tt_global_entry); | |
2236 | out: | |
2237 | return ret; | |
2238 | } |