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9cfc7bd6 | 1 | /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 | 2 | * |
35c133a0 | 3 | * Marek Lindner, Simon Wunderlich, Antonio Quartulli |
c6c8fea2 SE |
4 | * |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
c6c8fea2 SE |
18 | */ |
19 | ||
20 | #include "main.h" | |
21 | #include "translation-table.h" | |
22 | #include "soft-interface.h" | |
32ae9b22 | 23 | #include "hard-interface.h" |
a73105b8 | 24 | #include "send.h" |
c6c8fea2 SE |
25 | #include "hash.h" |
26 | #include "originator.h" | |
a73105b8 | 27 | #include "routing.h" |
20ff9d59 | 28 | #include "bridge_loop_avoidance.h" |
c6c8fea2 | 29 | |
a73105b8 AQ |
30 | #include <linux/crc16.h> |
31 | ||
a513088d SE |
32 | static void batadv_send_roam_adv(struct bat_priv *bat_priv, uint8_t *client, |
33 | struct orig_node *orig_node); | |
34 | static void batadv_tt_purge(struct work_struct *work); | |
35 | static void | |
36 | batadv_tt_global_del_orig_list(struct tt_global_entry *tt_global_entry); | |
c6c8fea2 | 37 | |
7aadf889 | 38 | /* returns 1 if they are the same mac addr */ |
a513088d | 39 | static int batadv_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 | ||
a513088d | 47 | static void batadv_tt_start_timer(struct bat_priv *bat_priv) |
c6c8fea2 | 48 | { |
a513088d | 49 | INIT_DELAYED_WORK(&bat_priv->tt_work, batadv_tt_purge); |
3193e8fd | 50 | queue_delayed_work(batadv_event_workqueue, &bat_priv->tt_work, |
a73105b8 | 51 | msecs_to_jiffies(5000)); |
c6c8fea2 SE |
52 | } |
53 | ||
a513088d SE |
54 | static struct tt_common_entry *batadv_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 | ||
da641193 | 65 | index = batadv_choose_orig(data, hash->size); |
7aadf889 ML |
66 | head = &hash->table[index]; |
67 | ||
68 | rcu_read_lock(); | |
48100bac | 69 | hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) { |
1eda58bf | 70 | if (!batadv_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 | ||
a513088d SE |
84 | static struct tt_local_entry * |
85 | batadv_tt_local_hash_find(struct bat_priv *bat_priv, 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 | |
a513088d | 90 | tt_common_entry = batadv_tt_hash_find(bat_priv->tt_local_hash, data); |
48100bac AQ |
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 | |
a513088d SE |
97 | static struct tt_global_entry * |
98 | batadv_tt_global_hash_find(struct bat_priv *bat_priv, const void *data) | |
48100bac AQ |
99 | { |
100 | struct tt_common_entry *tt_common_entry; | |
101 | struct tt_global_entry *tt_global_entry = NULL; | |
7683fdc1 | 102 | |
a513088d | 103 | tt_common_entry = batadv_tt_hash_find(bat_priv->tt_global_hash, data); |
48100bac AQ |
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 | ||
a513088d SE |
111 | static void |
112 | batadv_tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry) | |
7683fdc1 | 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 | ||
a513088d | 118 | static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu) |
531027fc | 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 | ||
a513088d SE |
130 | static void |
131 | batadv_tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry) | |
7683fdc1 | 132 | { |
db08e6e5 | 133 | if (atomic_dec_and_test(&tt_global_entry->common.refcount)) { |
a513088d | 134 | batadv_tt_global_del_orig_list(tt_global_entry); |
48100bac | 135 | call_rcu(&tt_global_entry->common.rcu, |
a513088d | 136 | batadv_tt_global_entry_free_rcu); |
db08e6e5 SW |
137 | } |
138 | } | |
139 | ||
a513088d | 140 | static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu) |
db08e6e5 SW |
141 | { |
142 | struct tt_orig_list_entry *orig_entry; | |
143 | ||
144 | orig_entry = container_of(rcu, struct tt_orig_list_entry, rcu); | |
7d211efc | 145 | batadv_orig_node_free_ref(orig_entry->orig_node); |
db08e6e5 SW |
146 | kfree(orig_entry); |
147 | } | |
148 | ||
a513088d SE |
149 | static void |
150 | batadv_tt_orig_list_entry_free_ref(struct tt_orig_list_entry *orig_entry) | |
db08e6e5 | 151 | { |
29cb99de AQ |
152 | /* to avoid race conditions, immediately decrease the tt counter */ |
153 | atomic_dec(&orig_entry->orig_node->tt_size); | |
a513088d | 154 | call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu); |
7683fdc1 AQ |
155 | } |
156 | ||
a513088d SE |
157 | static void batadv_tt_local_event(struct bat_priv *bat_priv, |
158 | const uint8_t *addr, uint8_t flags) | |
a73105b8 AQ |
159 | { |
160 | struct tt_change_node *tt_change_node; | |
161 | ||
162 | tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC); | |
163 | ||
164 | if (!tt_change_node) | |
165 | return; | |
166 | ||
ff66c975 | 167 | tt_change_node->change.flags = flags; |
a73105b8 AQ |
168 | memcpy(tt_change_node->change.addr, addr, ETH_ALEN); |
169 | ||
170 | spin_lock_bh(&bat_priv->tt_changes_list_lock); | |
171 | /* track the change in the OGMinterval list */ | |
172 | list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list); | |
173 | atomic_inc(&bat_priv->tt_local_changes); | |
174 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); | |
175 | ||
176 | atomic_set(&bat_priv->tt_ogm_append_cnt, 0); | |
177 | } | |
178 | ||
08c36d3e | 179 | int batadv_tt_len(int changes_num) |
a73105b8 AQ |
180 | { |
181 | return changes_num * sizeof(struct tt_change); | |
182 | } | |
183 | ||
a513088d | 184 | static int batadv_tt_local_init(struct bat_priv *bat_priv) |
c6c8fea2 | 185 | { |
2dafb49d | 186 | if (bat_priv->tt_local_hash) |
5346c35e | 187 | return 0; |
c6c8fea2 | 188 | |
1a8eaf07 | 189 | bat_priv->tt_local_hash = batadv_hash_new(1024); |
c6c8fea2 | 190 | |
2dafb49d | 191 | if (!bat_priv->tt_local_hash) |
5346c35e | 192 | return -ENOMEM; |
c6c8fea2 | 193 | |
5346c35e | 194 | return 0; |
c6c8fea2 SE |
195 | } |
196 | ||
08c36d3e SE |
197 | void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, |
198 | int ifindex) | |
c6c8fea2 SE |
199 | { |
200 | struct bat_priv *bat_priv = netdev_priv(soft_iface); | |
7683fdc1 AQ |
201 | struct tt_local_entry *tt_local_entry = NULL; |
202 | struct tt_global_entry *tt_global_entry = NULL; | |
db08e6e5 SW |
203 | struct hlist_head *head; |
204 | struct hlist_node *node; | |
205 | struct tt_orig_list_entry *orig_entry; | |
80b3f58c | 206 | int hash_added; |
c6c8fea2 | 207 | |
a513088d | 208 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
c6c8fea2 | 209 | |
2dafb49d AQ |
210 | if (tt_local_entry) { |
211 | tt_local_entry->last_seen = jiffies; | |
521251f2 AQ |
212 | /* possibly unset the TT_CLIENT_PENDING flag */ |
213 | tt_local_entry->common.flags &= ~TT_CLIENT_PENDING; | |
7683fdc1 | 214 | goto out; |
c6c8fea2 SE |
215 | } |
216 | ||
704509b8 | 217 | tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC); |
2dafb49d | 218 | if (!tt_local_entry) |
7683fdc1 | 219 | goto out; |
a73105b8 | 220 | |
1eda58bf SE |
221 | batadv_dbg(DBG_TT, bat_priv, |
222 | "Creating new local tt entry: %pM (ttvn: %d)\n", addr, | |
223 | (uint8_t)atomic_read(&bat_priv->ttvn)); | |
c6c8fea2 | 224 | |
48100bac AQ |
225 | memcpy(tt_local_entry->common.addr, addr, ETH_ALEN); |
226 | tt_local_entry->common.flags = NO_FLAGS; | |
9563877e | 227 | if (batadv_is_wifi_iface(ifindex)) |
48100bac AQ |
228 | tt_local_entry->common.flags |= TT_CLIENT_WIFI; |
229 | atomic_set(&tt_local_entry->common.refcount, 2); | |
230 | tt_local_entry->last_seen = jiffies; | |
c6c8fea2 SE |
231 | |
232 | /* the batman interface mac address should never be purged */ | |
1eda58bf | 233 | if (batadv_compare_eth(addr, soft_iface->dev_addr)) |
48100bac | 234 | tt_local_entry->common.flags |= TT_CLIENT_NOPURGE; |
c6c8fea2 | 235 | |
c40ed2bf AQ |
236 | /* The local entry has to be marked as NEW to avoid to send it in |
237 | * a full table response going out before the next ttvn increment | |
9cfc7bd6 SE |
238 | * (consistency check) |
239 | */ | |
c40ed2bf AQ |
240 | tt_local_entry->common.flags |= TT_CLIENT_NEW; |
241 | ||
a513088d | 242 | hash_added = batadv_hash_add(bat_priv->tt_local_hash, batadv_compare_tt, |
da641193 SE |
243 | batadv_choose_orig, |
244 | &tt_local_entry->common, | |
c0a55929 | 245 | &tt_local_entry->common.hash_entry); |
80b3f58c SW |
246 | |
247 | if (unlikely(hash_added != 0)) { | |
248 | /* remove the reference for the hash */ | |
a513088d | 249 | batadv_tt_local_entry_free_ref(tt_local_entry); |
80b3f58c SW |
250 | goto out; |
251 | } | |
252 | ||
a513088d | 253 | batadv_tt_local_event(bat_priv, addr, tt_local_entry->common.flags); |
ff66c975 | 254 | |
c6c8fea2 | 255 | /* remove address from global hash if present */ |
a513088d | 256 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
c6c8fea2 | 257 | |
cc47f66e AQ |
258 | /* Check whether it is a roaming! */ |
259 | if (tt_global_entry) { | |
db08e6e5 SW |
260 | /* These node are probably going to update their tt table */ |
261 | head = &tt_global_entry->orig_list; | |
262 | rcu_read_lock(); | |
263 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
264 | orig_entry->orig_node->tt_poss_change = true; | |
265 | ||
a513088d SE |
266 | batadv_send_roam_adv(bat_priv, |
267 | tt_global_entry->common.addr, | |
268 | orig_entry->orig_node); | |
db08e6e5 SW |
269 | } |
270 | rcu_read_unlock(); | |
271 | /* The global entry has to be marked as ROAMING and | |
272 | * has to be kept for consistency purpose | |
273 | */ | |
220b07e9 | 274 | tt_global_entry->common.flags |= TT_CLIENT_ROAM; |
03fc3070 | 275 | tt_global_entry->roam_at = jiffies; |
7683fdc1 AQ |
276 | } |
277 | out: | |
278 | if (tt_local_entry) | |
a513088d | 279 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7683fdc1 | 280 | if (tt_global_entry) |
a513088d | 281 | batadv_tt_global_entry_free_ref(tt_global_entry); |
c6c8fea2 SE |
282 | } |
283 | ||
a513088d SE |
284 | static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff, |
285 | int *packet_buff_len, | |
286 | int min_packet_len, | |
287 | int new_packet_len) | |
be9aa4c1 ML |
288 | { |
289 | unsigned char *new_buff; | |
290 | ||
291 | new_buff = kmalloc(new_packet_len, GFP_ATOMIC); | |
292 | ||
293 | /* keep old buffer if kmalloc should fail */ | |
294 | if (new_buff) { | |
295 | memcpy(new_buff, *packet_buff, min_packet_len); | |
296 | kfree(*packet_buff); | |
297 | *packet_buff = new_buff; | |
298 | *packet_buff_len = new_packet_len; | |
299 | } | |
300 | } | |
301 | ||
a513088d SE |
302 | static void batadv_tt_prepare_packet_buff(struct bat_priv *bat_priv, |
303 | unsigned char **packet_buff, | |
304 | int *packet_buff_len, | |
305 | int min_packet_len) | |
be9aa4c1 ML |
306 | { |
307 | struct hard_iface *primary_if; | |
308 | int req_len; | |
309 | ||
e5d89254 | 310 | primary_if = batadv_primary_if_get_selected(bat_priv); |
be9aa4c1 ML |
311 | |
312 | req_len = min_packet_len; | |
08c36d3e | 313 | req_len += batadv_tt_len(atomic_read(&bat_priv->tt_local_changes)); |
be9aa4c1 ML |
314 | |
315 | /* if we have too many changes for one packet don't send any | |
316 | * and wait for the tt table request which will be fragmented | |
317 | */ | |
318 | if ((!primary_if) || (req_len > primary_if->soft_iface->mtu)) | |
319 | req_len = min_packet_len; | |
320 | ||
a513088d SE |
321 | batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, |
322 | min_packet_len, req_len); | |
be9aa4c1 ML |
323 | |
324 | if (primary_if) | |
e5d89254 | 325 | batadv_hardif_free_ref(primary_if); |
be9aa4c1 ML |
326 | } |
327 | ||
a513088d SE |
328 | static int batadv_tt_changes_fill_buff(struct bat_priv *bat_priv, |
329 | unsigned char **packet_buff, | |
330 | int *packet_buff_len, | |
331 | int min_packet_len) | |
c6c8fea2 | 332 | { |
a73105b8 | 333 | struct tt_change_node *entry, *safe; |
be9aa4c1 ML |
334 | int count = 0, tot_changes = 0, new_len; |
335 | unsigned char *tt_buff; | |
336 | ||
a513088d SE |
337 | batadv_tt_prepare_packet_buff(bat_priv, packet_buff, |
338 | packet_buff_len, min_packet_len); | |
c6c8fea2 | 339 | |
be9aa4c1 ML |
340 | new_len = *packet_buff_len - min_packet_len; |
341 | tt_buff = *packet_buff + min_packet_len; | |
342 | ||
343 | if (new_len > 0) | |
08c36d3e | 344 | tot_changes = new_len / batadv_tt_len(1); |
c6c8fea2 | 345 | |
a73105b8 AQ |
346 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
347 | atomic_set(&bat_priv->tt_local_changes, 0); | |
c6c8fea2 | 348 | |
a73105b8 | 349 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
7c64fd98 | 350 | list) { |
a73105b8 | 351 | if (count < tot_changes) { |
08c36d3e | 352 | memcpy(tt_buff + batadv_tt_len(count), |
a73105b8 | 353 | &entry->change, sizeof(struct tt_change)); |
c6c8fea2 SE |
354 | count++; |
355 | } | |
a73105b8 AQ |
356 | list_del(&entry->list); |
357 | kfree(entry); | |
c6c8fea2 | 358 | } |
a73105b8 AQ |
359 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); |
360 | ||
361 | /* Keep the buffer for possible tt_request */ | |
362 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
363 | kfree(bat_priv->tt_buff); | |
364 | bat_priv->tt_buff_len = 0; | |
365 | bat_priv->tt_buff = NULL; | |
be9aa4c1 ML |
366 | /* check whether this new OGM has no changes due to size problems */ |
367 | if (new_len > 0) { | |
368 | /* if kmalloc() fails we will reply with the full table | |
a73105b8 AQ |
369 | * instead of providing the diff |
370 | */ | |
be9aa4c1 | 371 | bat_priv->tt_buff = kmalloc(new_len, GFP_ATOMIC); |
a73105b8 | 372 | if (bat_priv->tt_buff) { |
be9aa4c1 ML |
373 | memcpy(bat_priv->tt_buff, tt_buff, new_len); |
374 | bat_priv->tt_buff_len = new_len; | |
a73105b8 AQ |
375 | } |
376 | } | |
377 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
c6c8fea2 | 378 | |
08ad76ec | 379 | return count; |
c6c8fea2 SE |
380 | } |
381 | ||
08c36d3e | 382 | int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
383 | { |
384 | struct net_device *net_dev = (struct net_device *)seq->private; | |
385 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
2dafb49d | 386 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
48100bac | 387 | struct tt_common_entry *tt_common_entry; |
32ae9b22 | 388 | struct hard_iface *primary_if; |
7aadf889 | 389 | struct hlist_node *node; |
c6c8fea2 | 390 | struct hlist_head *head; |
c90681b8 AQ |
391 | uint32_t i; |
392 | int ret = 0; | |
32ae9b22 | 393 | |
e5d89254 | 394 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 395 | if (!primary_if) { |
86ceb360 SE |
396 | ret = seq_printf(seq, |
397 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
398 | net_dev->name); |
399 | goto out; | |
400 | } | |
c6c8fea2 | 401 | |
32ae9b22 | 402 | if (primary_if->if_status != IF_ACTIVE) { |
86ceb360 SE |
403 | ret = seq_printf(seq, |
404 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
405 | net_dev->name); |
406 | goto out; | |
c6c8fea2 SE |
407 | } |
408 | ||
86ceb360 SE |
409 | seq_printf(seq, |
410 | "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n", | |
a73105b8 | 411 | net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn)); |
c6c8fea2 | 412 | |
c6c8fea2 SE |
413 | for (i = 0; i < hash->size; i++) { |
414 | head = &hash->table[i]; | |
415 | ||
7aadf889 | 416 | rcu_read_lock(); |
48100bac | 417 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 418 | head, hash_entry) { |
d099c2c5 | 419 | seq_printf(seq, " * %pM [%c%c%c%c%c]\n", |
7c64fd98 SE |
420 | tt_common_entry->addr, |
421 | (tt_common_entry->flags & | |
422 | TT_CLIENT_ROAM ? 'R' : '.'), | |
423 | (tt_common_entry->flags & | |
424 | TT_CLIENT_NOPURGE ? 'P' : '.'), | |
425 | (tt_common_entry->flags & | |
426 | TT_CLIENT_NEW ? 'N' : '.'), | |
427 | (tt_common_entry->flags & | |
428 | TT_CLIENT_PENDING ? 'X' : '.'), | |
429 | (tt_common_entry->flags & | |
430 | TT_CLIENT_WIFI ? 'W' : '.')); | |
c6c8fea2 | 431 | } |
7aadf889 | 432 | rcu_read_unlock(); |
c6c8fea2 | 433 | } |
32ae9b22 ML |
434 | out: |
435 | if (primary_if) | |
e5d89254 | 436 | batadv_hardif_free_ref(primary_if); |
32ae9b22 | 437 | return ret; |
c6c8fea2 SE |
438 | } |
439 | ||
a513088d SE |
440 | static void batadv_tt_local_set_pending(struct bat_priv *bat_priv, |
441 | struct tt_local_entry *tt_local_entry, | |
442 | uint16_t flags, const char *message) | |
c6c8fea2 | 443 | { |
a513088d SE |
444 | batadv_tt_local_event(bat_priv, tt_local_entry->common.addr, |
445 | tt_local_entry->common.flags | flags); | |
a73105b8 | 446 | |
015758d0 AQ |
447 | /* The local client has to be marked as "pending to be removed" but has |
448 | * to be kept in the table in order to send it in a full table | |
9cfc7bd6 SE |
449 | * response issued before the net ttvn increment (consistency check) |
450 | */ | |
48100bac | 451 | tt_local_entry->common.flags |= TT_CLIENT_PENDING; |
c566dbbe | 452 | |
1eda58bf SE |
453 | batadv_dbg(DBG_TT, bat_priv, |
454 | "Local tt entry (%pM) pending to be removed: %s\n", | |
455 | tt_local_entry->common.addr, message); | |
c6c8fea2 SE |
456 | } |
457 | ||
08c36d3e SE |
458 | void batadv_tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr, |
459 | const char *message, bool roaming) | |
c6c8fea2 | 460 | { |
7683fdc1 | 461 | struct tt_local_entry *tt_local_entry = NULL; |
c6c8fea2 | 462 | |
a513088d | 463 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
464 | if (!tt_local_entry) |
465 | goto out; | |
466 | ||
a513088d SE |
467 | batadv_tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL | |
468 | (roaming ? TT_CLIENT_ROAM : NO_FLAGS), | |
469 | message); | |
7683fdc1 AQ |
470 | out: |
471 | if (tt_local_entry) | |
a513088d | 472 | batadv_tt_local_entry_free_ref(tt_local_entry); |
c6c8fea2 SE |
473 | } |
474 | ||
a513088d | 475 | static void batadv_tt_local_purge(struct bat_priv *bat_priv) |
c6c8fea2 | 476 | { |
2dafb49d AQ |
477 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
478 | struct tt_local_entry *tt_local_entry; | |
48100bac | 479 | struct tt_common_entry *tt_common_entry; |
7aadf889 | 480 | struct hlist_node *node, *node_tmp; |
c6c8fea2 | 481 | struct hlist_head *head; |
7683fdc1 | 482 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 483 | uint32_t i; |
c6c8fea2 | 484 | |
c6c8fea2 SE |
485 | for (i = 0; i < hash->size; i++) { |
486 | head = &hash->table[i]; | |
7683fdc1 | 487 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 488 | |
7683fdc1 | 489 | spin_lock_bh(list_lock); |
48100bac | 490 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
7aadf889 | 491 | head, hash_entry) { |
48100bac AQ |
492 | tt_local_entry = container_of(tt_common_entry, |
493 | struct tt_local_entry, | |
494 | common); | |
495 | if (tt_local_entry->common.flags & TT_CLIENT_NOPURGE) | |
7aadf889 | 496 | continue; |
c6c8fea2 | 497 | |
058d0e26 | 498 | /* entry already marked for deletion */ |
48100bac | 499 | if (tt_local_entry->common.flags & TT_CLIENT_PENDING) |
058d0e26 AQ |
500 | continue; |
501 | ||
1eda58bf SE |
502 | if (!batadv_has_timed_out(tt_local_entry->last_seen, |
503 | TT_LOCAL_TIMEOUT)) | |
7aadf889 ML |
504 | continue; |
505 | ||
a513088d SE |
506 | batadv_tt_local_set_pending(bat_priv, tt_local_entry, |
507 | TT_CLIENT_DEL, "timed out"); | |
c6c8fea2 | 508 | } |
7683fdc1 | 509 | spin_unlock_bh(list_lock); |
c6c8fea2 SE |
510 | } |
511 | ||
c6c8fea2 SE |
512 | } |
513 | ||
a513088d | 514 | static void batadv_tt_local_table_free(struct bat_priv *bat_priv) |
c6c8fea2 | 515 | { |
a73105b8 | 516 | struct hashtable_t *hash; |
a73105b8 | 517 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
48100bac | 518 | struct tt_common_entry *tt_common_entry; |
a73105b8 | 519 | struct tt_local_entry *tt_local_entry; |
7683fdc1 AQ |
520 | struct hlist_node *node, *node_tmp; |
521 | struct hlist_head *head; | |
c90681b8 | 522 | uint32_t i; |
a73105b8 | 523 | |
2dafb49d | 524 | if (!bat_priv->tt_local_hash) |
c6c8fea2 SE |
525 | return; |
526 | ||
a73105b8 AQ |
527 | hash = bat_priv->tt_local_hash; |
528 | ||
529 | for (i = 0; i < hash->size; i++) { | |
530 | head = &hash->table[i]; | |
531 | list_lock = &hash->list_locks[i]; | |
532 | ||
533 | spin_lock_bh(list_lock); | |
48100bac | 534 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
a73105b8 AQ |
535 | head, hash_entry) { |
536 | hlist_del_rcu(node); | |
48100bac AQ |
537 | tt_local_entry = container_of(tt_common_entry, |
538 | struct tt_local_entry, | |
539 | common); | |
a513088d | 540 | batadv_tt_local_entry_free_ref(tt_local_entry); |
a73105b8 AQ |
541 | } |
542 | spin_unlock_bh(list_lock); | |
543 | } | |
544 | ||
1a8eaf07 | 545 | batadv_hash_destroy(hash); |
a73105b8 | 546 | |
2dafb49d | 547 | bat_priv->tt_local_hash = NULL; |
c6c8fea2 SE |
548 | } |
549 | ||
a513088d | 550 | static int batadv_tt_global_init(struct bat_priv *bat_priv) |
c6c8fea2 | 551 | { |
2dafb49d | 552 | if (bat_priv->tt_global_hash) |
5346c35e | 553 | return 0; |
c6c8fea2 | 554 | |
1a8eaf07 | 555 | bat_priv->tt_global_hash = batadv_hash_new(1024); |
c6c8fea2 | 556 | |
2dafb49d | 557 | if (!bat_priv->tt_global_hash) |
5346c35e | 558 | return -ENOMEM; |
c6c8fea2 | 559 | |
5346c35e | 560 | return 0; |
c6c8fea2 SE |
561 | } |
562 | ||
a513088d | 563 | static void batadv_tt_changes_list_free(struct bat_priv *bat_priv) |
c6c8fea2 | 564 | { |
a73105b8 | 565 | struct tt_change_node *entry, *safe; |
c6c8fea2 | 566 | |
a73105b8 | 567 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
c6c8fea2 | 568 | |
a73105b8 AQ |
569 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
570 | list) { | |
571 | list_del(&entry->list); | |
572 | kfree(entry); | |
573 | } | |
c6c8fea2 | 574 | |
a73105b8 AQ |
575 | atomic_set(&bat_priv->tt_local_changes, 0); |
576 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); | |
577 | } | |
c6c8fea2 | 578 | |
db08e6e5 SW |
579 | /* find out if an orig_node is already in the list of a tt_global_entry. |
580 | * returns 1 if found, 0 otherwise | |
581 | */ | |
a513088d SE |
582 | static bool batadv_tt_global_entry_has_orig(const struct tt_global_entry *entry, |
583 | const struct orig_node *orig_node) | |
db08e6e5 SW |
584 | { |
585 | struct tt_orig_list_entry *tmp_orig_entry; | |
586 | const struct hlist_head *head; | |
587 | struct hlist_node *node; | |
588 | bool found = false; | |
589 | ||
590 | rcu_read_lock(); | |
591 | head = &entry->orig_list; | |
592 | hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) { | |
593 | if (tmp_orig_entry->orig_node == orig_node) { | |
594 | found = true; | |
595 | break; | |
596 | } | |
597 | } | |
598 | rcu_read_unlock(); | |
599 | return found; | |
600 | } | |
601 | ||
a513088d SE |
602 | static void |
603 | batadv_tt_global_add_orig_entry(struct tt_global_entry *tt_global_entry, | |
604 | struct orig_node *orig_node, int ttvn) | |
db08e6e5 SW |
605 | { |
606 | struct tt_orig_list_entry *orig_entry; | |
607 | ||
608 | orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC); | |
609 | if (!orig_entry) | |
610 | return; | |
611 | ||
612 | INIT_HLIST_NODE(&orig_entry->list); | |
613 | atomic_inc(&orig_node->refcount); | |
614 | atomic_inc(&orig_node->tt_size); | |
615 | orig_entry->orig_node = orig_node; | |
616 | orig_entry->ttvn = ttvn; | |
617 | ||
618 | spin_lock_bh(&tt_global_entry->list_lock); | |
619 | hlist_add_head_rcu(&orig_entry->list, | |
620 | &tt_global_entry->orig_list); | |
621 | spin_unlock_bh(&tt_global_entry->list_lock); | |
622 | } | |
623 | ||
a73105b8 | 624 | /* caller must hold orig_node refcount */ |
08c36d3e SE |
625 | int batadv_tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node, |
626 | const unsigned char *tt_addr, uint8_t ttvn, | |
627 | bool roaming, bool wifi) | |
a73105b8 | 628 | { |
db08e6e5 | 629 | struct tt_global_entry *tt_global_entry = NULL; |
7683fdc1 | 630 | int ret = 0; |
80b3f58c | 631 | int hash_added; |
c0a55929 | 632 | struct tt_common_entry *common; |
c6c8fea2 | 633 | |
a513088d | 634 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr); |
a73105b8 AQ |
635 | |
636 | if (!tt_global_entry) { | |
db08e6e5 SW |
637 | tt_global_entry = kzalloc(sizeof(*tt_global_entry), |
638 | GFP_ATOMIC); | |
a73105b8 | 639 | if (!tt_global_entry) |
7683fdc1 AQ |
640 | goto out; |
641 | ||
c0a55929 SE |
642 | common = &tt_global_entry->common; |
643 | memcpy(common->addr, tt_addr, ETH_ALEN); | |
db08e6e5 | 644 | |
c0a55929 | 645 | common->flags = NO_FLAGS; |
cc47f66e | 646 | tt_global_entry->roam_at = 0; |
c0a55929 | 647 | atomic_set(&common->refcount, 2); |
db08e6e5 SW |
648 | |
649 | INIT_HLIST_HEAD(&tt_global_entry->orig_list); | |
650 | spin_lock_init(&tt_global_entry->list_lock); | |
7683fdc1 | 651 | |
c0a55929 | 652 | hash_added = batadv_hash_add(bat_priv->tt_global_hash, |
a513088d SE |
653 | batadv_compare_tt, |
654 | batadv_choose_orig, common, | |
655 | &common->hash_entry); | |
80b3f58c SW |
656 | |
657 | if (unlikely(hash_added != 0)) { | |
658 | /* remove the reference for the hash */ | |
a513088d | 659 | batadv_tt_global_entry_free_ref(tt_global_entry); |
80b3f58c SW |
660 | goto out_remove; |
661 | } | |
db08e6e5 | 662 | |
a513088d SE |
663 | batadv_tt_global_add_orig_entry(tt_global_entry, orig_node, |
664 | ttvn); | |
a73105b8 | 665 | } else { |
db08e6e5 SW |
666 | /* there is already a global entry, use this one. */ |
667 | ||
668 | /* If there is the TT_CLIENT_ROAM flag set, there is only one | |
669 | * originator left in the list and we previously received a | |
670 | * delete + roaming change for this originator. | |
671 | * | |
672 | * We should first delete the old originator before adding the | |
673 | * new one. | |
674 | */ | |
675 | if (tt_global_entry->common.flags & TT_CLIENT_ROAM) { | |
a513088d | 676 | batadv_tt_global_del_orig_list(tt_global_entry); |
db08e6e5 SW |
677 | tt_global_entry->common.flags &= ~TT_CLIENT_ROAM; |
678 | tt_global_entry->roam_at = 0; | |
a73105b8 | 679 | } |
db08e6e5 | 680 | |
a513088d SE |
681 | if (!batadv_tt_global_entry_has_orig(tt_global_entry, |
682 | orig_node)) | |
683 | batadv_tt_global_add_orig_entry(tt_global_entry, | |
684 | orig_node, ttvn); | |
a73105b8 | 685 | } |
c6c8fea2 | 686 | |
bc279080 | 687 | if (wifi) |
48100bac | 688 | tt_global_entry->common.flags |= TT_CLIENT_WIFI; |
bc279080 | 689 | |
1eda58bf SE |
690 | batadv_dbg(DBG_TT, bat_priv, |
691 | "Creating new global tt entry: %pM (via %pM)\n", | |
692 | tt_global_entry->common.addr, orig_node->orig); | |
c6c8fea2 | 693 | |
80b3f58c | 694 | out_remove: |
a73105b8 | 695 | /* remove address from local hash if present */ |
08c36d3e SE |
696 | batadv_tt_local_remove(bat_priv, tt_global_entry->common.addr, |
697 | "global tt received", roaming); | |
7683fdc1 AQ |
698 | ret = 1; |
699 | out: | |
700 | if (tt_global_entry) | |
a513088d | 701 | batadv_tt_global_entry_free_ref(tt_global_entry); |
7683fdc1 | 702 | return ret; |
c6c8fea2 SE |
703 | } |
704 | ||
db08e6e5 SW |
705 | /* print all orig nodes who announce the address for this global entry. |
706 | * it is assumed that the caller holds rcu_read_lock(); | |
707 | */ | |
a513088d SE |
708 | static void |
709 | batadv_tt_global_print_entry(struct tt_global_entry *tt_global_entry, | |
710 | struct seq_file *seq) | |
db08e6e5 SW |
711 | { |
712 | struct hlist_head *head; | |
713 | struct hlist_node *node; | |
714 | struct tt_orig_list_entry *orig_entry; | |
715 | struct tt_common_entry *tt_common_entry; | |
716 | uint16_t flags; | |
717 | uint8_t last_ttvn; | |
718 | ||
719 | tt_common_entry = &tt_global_entry->common; | |
720 | ||
721 | head = &tt_global_entry->orig_list; | |
722 | ||
723 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
724 | flags = tt_common_entry->flags; | |
725 | last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn); | |
726 | seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c]\n", | |
727 | tt_global_entry->common.addr, orig_entry->ttvn, | |
728 | orig_entry->orig_node->orig, last_ttvn, | |
729 | (flags & TT_CLIENT_ROAM ? 'R' : '.'), | |
730 | (flags & TT_CLIENT_WIFI ? 'W' : '.')); | |
731 | } | |
732 | } | |
733 | ||
08c36d3e | 734 | int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
735 | { |
736 | struct net_device *net_dev = (struct net_device *)seq->private; | |
737 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
2dafb49d | 738 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
48100bac | 739 | struct tt_common_entry *tt_common_entry; |
2dafb49d | 740 | struct tt_global_entry *tt_global_entry; |
32ae9b22 | 741 | struct hard_iface *primary_if; |
7aadf889 | 742 | struct hlist_node *node; |
c6c8fea2 | 743 | struct hlist_head *head; |
c90681b8 AQ |
744 | uint32_t i; |
745 | int ret = 0; | |
32ae9b22 | 746 | |
e5d89254 | 747 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 748 | if (!primary_if) { |
86ceb360 SE |
749 | ret = seq_printf(seq, |
750 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
751 | net_dev->name); |
752 | goto out; | |
753 | } | |
c6c8fea2 | 754 | |
32ae9b22 | 755 | if (primary_if->if_status != IF_ACTIVE) { |
86ceb360 SE |
756 | ret = seq_printf(seq, |
757 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
758 | net_dev->name); |
759 | goto out; | |
c6c8fea2 SE |
760 | } |
761 | ||
2dafb49d AQ |
762 | seq_printf(seq, |
763 | "Globally announced TT entries received via the mesh %s\n", | |
c6c8fea2 | 764 | net_dev->name); |
df6edb9e AQ |
765 | seq_printf(seq, " %-13s %s %-15s %s %s\n", |
766 | "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags"); | |
c6c8fea2 | 767 | |
c6c8fea2 SE |
768 | for (i = 0; i < hash->size; i++) { |
769 | head = &hash->table[i]; | |
770 | ||
7aadf889 | 771 | rcu_read_lock(); |
48100bac | 772 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 773 | head, hash_entry) { |
48100bac AQ |
774 | tt_global_entry = container_of(tt_common_entry, |
775 | struct tt_global_entry, | |
776 | common); | |
a513088d | 777 | batadv_tt_global_print_entry(tt_global_entry, seq); |
c6c8fea2 | 778 | } |
7aadf889 | 779 | rcu_read_unlock(); |
c6c8fea2 | 780 | } |
32ae9b22 ML |
781 | out: |
782 | if (primary_if) | |
e5d89254 | 783 | batadv_hardif_free_ref(primary_if); |
32ae9b22 | 784 | return ret; |
c6c8fea2 SE |
785 | } |
786 | ||
db08e6e5 | 787 | /* deletes the orig list of a tt_global_entry */ |
a513088d SE |
788 | static void |
789 | batadv_tt_global_del_orig_list(struct tt_global_entry *tt_global_entry) | |
c6c8fea2 | 790 | { |
db08e6e5 SW |
791 | struct hlist_head *head; |
792 | struct hlist_node *node, *safe; | |
793 | struct tt_orig_list_entry *orig_entry; | |
a73105b8 | 794 | |
db08e6e5 SW |
795 | spin_lock_bh(&tt_global_entry->list_lock); |
796 | head = &tt_global_entry->orig_list; | |
797 | hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { | |
798 | hlist_del_rcu(node); | |
a513088d | 799 | batadv_tt_orig_list_entry_free_ref(orig_entry); |
db08e6e5 SW |
800 | } |
801 | spin_unlock_bh(&tt_global_entry->list_lock); | |
c6c8fea2 | 802 | |
db08e6e5 SW |
803 | } |
804 | ||
a513088d SE |
805 | static void |
806 | batadv_tt_global_del_orig_entry(struct bat_priv *bat_priv, | |
807 | struct tt_global_entry *tt_global_entry, | |
808 | struct orig_node *orig_node, | |
809 | const char *message) | |
db08e6e5 SW |
810 | { |
811 | struct hlist_head *head; | |
812 | struct hlist_node *node, *safe; | |
813 | struct tt_orig_list_entry *orig_entry; | |
814 | ||
815 | spin_lock_bh(&tt_global_entry->list_lock); | |
816 | head = &tt_global_entry->orig_list; | |
817 | hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { | |
818 | if (orig_entry->orig_node == orig_node) { | |
1eda58bf SE |
819 | batadv_dbg(DBG_TT, bat_priv, |
820 | "Deleting %pM from global tt entry %pM: %s\n", | |
821 | orig_node->orig, | |
822 | tt_global_entry->common.addr, message); | |
db08e6e5 | 823 | hlist_del_rcu(node); |
a513088d | 824 | batadv_tt_orig_list_entry_free_ref(orig_entry); |
db08e6e5 SW |
825 | } |
826 | } | |
827 | spin_unlock_bh(&tt_global_entry->list_lock); | |
828 | } | |
829 | ||
a513088d SE |
830 | static void batadv_tt_global_del_struct(struct bat_priv *bat_priv, |
831 | struct tt_global_entry *tt_global_entry, | |
832 | const char *message) | |
db08e6e5 | 833 | { |
1eda58bf SE |
834 | batadv_dbg(DBG_TT, bat_priv, "Deleting global tt entry %pM: %s\n", |
835 | tt_global_entry->common.addr, message); | |
7683fdc1 | 836 | |
a513088d | 837 | batadv_hash_remove(bat_priv->tt_global_hash, batadv_compare_tt, |
da641193 | 838 | batadv_choose_orig, tt_global_entry->common.addr); |
a513088d | 839 | batadv_tt_global_entry_free_ref(tt_global_entry); |
db08e6e5 | 840 | |
c6c8fea2 SE |
841 | } |
842 | ||
db08e6e5 SW |
843 | /* If the client is to be deleted, we check if it is the last origantor entry |
844 | * within tt_global entry. If yes, we set the TT_CLIENT_ROAM flag and the timer, | |
845 | * otherwise we simply remove the originator scheduled for deletion. | |
846 | */ | |
a513088d SE |
847 | static void |
848 | batadv_tt_global_del_roaming(struct bat_priv *bat_priv, | |
849 | struct tt_global_entry *tt_global_entry, | |
850 | struct orig_node *orig_node, const char *message) | |
db08e6e5 SW |
851 | { |
852 | bool last_entry = true; | |
853 | struct hlist_head *head; | |
854 | struct hlist_node *node; | |
855 | struct tt_orig_list_entry *orig_entry; | |
856 | ||
857 | /* no local entry exists, case 1: | |
858 | * Check if this is the last one or if other entries exist. | |
859 | */ | |
860 | ||
861 | rcu_read_lock(); | |
862 | head = &tt_global_entry->orig_list; | |
863 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
864 | if (orig_entry->orig_node != orig_node) { | |
865 | last_entry = false; | |
866 | break; | |
867 | } | |
868 | } | |
869 | rcu_read_unlock(); | |
870 | ||
871 | if (last_entry) { | |
872 | /* its the last one, mark for roaming. */ | |
873 | tt_global_entry->common.flags |= TT_CLIENT_ROAM; | |
874 | tt_global_entry->roam_at = jiffies; | |
875 | } else | |
876 | /* there is another entry, we can simply delete this | |
877 | * one and can still use the other one. | |
878 | */ | |
a513088d SE |
879 | batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, |
880 | orig_node, message); | |
db08e6e5 SW |
881 | } |
882 | ||
883 | ||
884 | ||
a513088d SE |
885 | static void batadv_tt_global_del(struct bat_priv *bat_priv, |
886 | struct orig_node *orig_node, | |
887 | const unsigned char *addr, | |
888 | const char *message, bool roaming) | |
a73105b8 | 889 | { |
7683fdc1 | 890 | struct tt_global_entry *tt_global_entry = NULL; |
a513088d | 891 | struct tt_local_entry *local_entry = NULL; |
a73105b8 | 892 | |
a513088d | 893 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
db08e6e5 | 894 | if (!tt_global_entry) |
7683fdc1 | 895 | goto out; |
a73105b8 | 896 | |
db08e6e5 | 897 | if (!roaming) { |
a513088d SE |
898 | batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, |
899 | orig_node, message); | |
db08e6e5 SW |
900 | |
901 | if (hlist_empty(&tt_global_entry->orig_list)) | |
a513088d SE |
902 | batadv_tt_global_del_struct(bat_priv, tt_global_entry, |
903 | message); | |
db08e6e5 SW |
904 | |
905 | goto out; | |
906 | } | |
92f90f56 SE |
907 | |
908 | /* if we are deleting a global entry due to a roam | |
909 | * event, there are two possibilities: | |
db08e6e5 SW |
910 | * 1) the client roamed from node A to node B => if there |
911 | * is only one originator left for this client, we mark | |
92f90f56 SE |
912 | * it with TT_CLIENT_ROAM, we start a timer and we |
913 | * wait for node B to claim it. In case of timeout | |
914 | * the entry is purged. | |
db08e6e5 SW |
915 | * |
916 | * If there are other originators left, we directly delete | |
917 | * the originator. | |
92f90f56 | 918 | * 2) the client roamed to us => we can directly delete |
9cfc7bd6 SE |
919 | * the global entry, since it is useless now. |
920 | */ | |
a513088d SE |
921 | local_entry = batadv_tt_local_hash_find(bat_priv, |
922 | tt_global_entry->common.addr); | |
923 | if (local_entry) { | |
db08e6e5 | 924 | /* local entry exists, case 2: client roamed to us. */ |
a513088d SE |
925 | batadv_tt_global_del_orig_list(tt_global_entry); |
926 | batadv_tt_global_del_struct(bat_priv, tt_global_entry, message); | |
db08e6e5 SW |
927 | } else |
928 | /* no local entry exists, case 1: check for roaming */ | |
a513088d SE |
929 | batadv_tt_global_del_roaming(bat_priv, tt_global_entry, |
930 | orig_node, message); | |
92f90f56 | 931 | |
92f90f56 | 932 | |
cc47f66e | 933 | out: |
7683fdc1 | 934 | if (tt_global_entry) |
a513088d SE |
935 | batadv_tt_global_entry_free_ref(tt_global_entry); |
936 | if (local_entry) | |
937 | batadv_tt_local_entry_free_ref(local_entry); | |
a73105b8 AQ |
938 | } |
939 | ||
08c36d3e SE |
940 | void batadv_tt_global_del_orig(struct bat_priv *bat_priv, |
941 | struct orig_node *orig_node, const char *message) | |
c6c8fea2 | 942 | { |
a513088d | 943 | struct tt_global_entry *global_entry; |
48100bac | 944 | struct tt_common_entry *tt_common_entry; |
c90681b8 | 945 | uint32_t i; |
a73105b8 AQ |
946 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
947 | struct hlist_node *node, *safe; | |
948 | struct hlist_head *head; | |
7683fdc1 | 949 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c6c8fea2 | 950 | |
6e801494 SW |
951 | if (!hash) |
952 | return; | |
953 | ||
a73105b8 AQ |
954 | for (i = 0; i < hash->size; i++) { |
955 | head = &hash->table[i]; | |
7683fdc1 | 956 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 957 | |
7683fdc1 | 958 | spin_lock_bh(list_lock); |
48100bac | 959 | hlist_for_each_entry_safe(tt_common_entry, node, safe, |
7c64fd98 | 960 | head, hash_entry) { |
a513088d SE |
961 | global_entry = container_of(tt_common_entry, |
962 | struct tt_global_entry, | |
963 | common); | |
db08e6e5 | 964 | |
a513088d SE |
965 | batadv_tt_global_del_orig_entry(bat_priv, global_entry, |
966 | orig_node, message); | |
db08e6e5 | 967 | |
a513088d | 968 | if (hlist_empty(&global_entry->orig_list)) { |
1eda58bf SE |
969 | batadv_dbg(DBG_TT, bat_priv, |
970 | "Deleting global tt entry %pM: %s\n", | |
a513088d | 971 | global_entry->common.addr, message); |
7683fdc1 | 972 | hlist_del_rcu(node); |
a513088d | 973 | batadv_tt_global_entry_free_ref(global_entry); |
7683fdc1 | 974 | } |
a73105b8 | 975 | } |
7683fdc1 | 976 | spin_unlock_bh(list_lock); |
c6c8fea2 | 977 | } |
17071578 | 978 | orig_node->tt_initialised = false; |
c6c8fea2 SE |
979 | } |
980 | ||
a513088d | 981 | static void batadv_tt_global_roam_purge(struct bat_priv *bat_priv) |
cc47f66e AQ |
982 | { |
983 | struct hashtable_t *hash = bat_priv->tt_global_hash; | |
48100bac | 984 | struct tt_common_entry *tt_common_entry; |
cc47f66e AQ |
985 | struct tt_global_entry *tt_global_entry; |
986 | struct hlist_node *node, *node_tmp; | |
987 | struct hlist_head *head; | |
7683fdc1 | 988 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 989 | uint32_t i; |
cc47f66e | 990 | |
cc47f66e AQ |
991 | for (i = 0; i < hash->size; i++) { |
992 | head = &hash->table[i]; | |
7683fdc1 | 993 | list_lock = &hash->list_locks[i]; |
cc47f66e | 994 | |
7683fdc1 | 995 | spin_lock_bh(list_lock); |
48100bac | 996 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
cc47f66e | 997 | head, hash_entry) { |
48100bac AQ |
998 | tt_global_entry = container_of(tt_common_entry, |
999 | struct tt_global_entry, | |
1000 | common); | |
1001 | if (!(tt_global_entry->common.flags & TT_CLIENT_ROAM)) | |
cc47f66e | 1002 | continue; |
1eda58bf SE |
1003 | if (!batadv_has_timed_out(tt_global_entry->roam_at, |
1004 | TT_CLIENT_ROAM_TIMEOUT)) | |
cc47f66e AQ |
1005 | continue; |
1006 | ||
1eda58bf SE |
1007 | batadv_dbg(DBG_TT, bat_priv, |
1008 | "Deleting global tt entry (%pM): Roaming timeout\n", | |
1009 | tt_global_entry->common.addr); | |
db08e6e5 | 1010 | |
7683fdc1 | 1011 | hlist_del_rcu(node); |
a513088d | 1012 | batadv_tt_global_entry_free_ref(tt_global_entry); |
cc47f66e | 1013 | } |
7683fdc1 | 1014 | spin_unlock_bh(list_lock); |
cc47f66e AQ |
1015 | } |
1016 | ||
cc47f66e AQ |
1017 | } |
1018 | ||
a513088d | 1019 | static void batadv_tt_global_table_free(struct bat_priv *bat_priv) |
c6c8fea2 | 1020 | { |
7683fdc1 AQ |
1021 | struct hashtable_t *hash; |
1022 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
48100bac | 1023 | struct tt_common_entry *tt_common_entry; |
7683fdc1 AQ |
1024 | struct tt_global_entry *tt_global_entry; |
1025 | struct hlist_node *node, *node_tmp; | |
1026 | struct hlist_head *head; | |
c90681b8 | 1027 | uint32_t i; |
7683fdc1 | 1028 | |
2dafb49d | 1029 | if (!bat_priv->tt_global_hash) |
c6c8fea2 SE |
1030 | return; |
1031 | ||
7683fdc1 AQ |
1032 | hash = bat_priv->tt_global_hash; |
1033 | ||
1034 | for (i = 0; i < hash->size; i++) { | |
1035 | head = &hash->table[i]; | |
1036 | list_lock = &hash->list_locks[i]; | |
1037 | ||
1038 | spin_lock_bh(list_lock); | |
48100bac | 1039 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
7683fdc1 AQ |
1040 | head, hash_entry) { |
1041 | hlist_del_rcu(node); | |
48100bac AQ |
1042 | tt_global_entry = container_of(tt_common_entry, |
1043 | struct tt_global_entry, | |
1044 | common); | |
a513088d | 1045 | batadv_tt_global_entry_free_ref(tt_global_entry); |
7683fdc1 AQ |
1046 | } |
1047 | spin_unlock_bh(list_lock); | |
1048 | } | |
1049 | ||
1a8eaf07 | 1050 | batadv_hash_destroy(hash); |
7683fdc1 | 1051 | |
2dafb49d | 1052 | bat_priv->tt_global_hash = NULL; |
c6c8fea2 SE |
1053 | } |
1054 | ||
a513088d SE |
1055 | static bool _batadv_is_ap_isolated(struct tt_local_entry *tt_local_entry, |
1056 | struct tt_global_entry *tt_global_entry) | |
59b699cd AQ |
1057 | { |
1058 | bool ret = false; | |
1059 | ||
48100bac AQ |
1060 | if (tt_local_entry->common.flags & TT_CLIENT_WIFI && |
1061 | tt_global_entry->common.flags & TT_CLIENT_WIFI) | |
59b699cd AQ |
1062 | ret = true; |
1063 | ||
1064 | return ret; | |
1065 | } | |
1066 | ||
08c36d3e SE |
1067 | struct orig_node *batadv_transtable_search(struct bat_priv *bat_priv, |
1068 | const uint8_t *src, | |
1069 | const uint8_t *addr) | |
c6c8fea2 | 1070 | { |
3d393e47 AQ |
1071 | struct tt_local_entry *tt_local_entry = NULL; |
1072 | struct tt_global_entry *tt_global_entry = NULL; | |
7b36e8ee | 1073 | struct orig_node *orig_node = NULL; |
db08e6e5 SW |
1074 | struct neigh_node *router = NULL; |
1075 | struct hlist_head *head; | |
1076 | struct hlist_node *node; | |
1077 | struct tt_orig_list_entry *orig_entry; | |
1078 | int best_tq; | |
c6c8fea2 | 1079 | |
3d393e47 | 1080 | if (src && atomic_read(&bat_priv->ap_isolation)) { |
a513088d | 1081 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, src); |
3d393e47 AQ |
1082 | if (!tt_local_entry) |
1083 | goto out; | |
1084 | } | |
7aadf889 | 1085 | |
a513088d | 1086 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
2dafb49d | 1087 | if (!tt_global_entry) |
7b36e8ee | 1088 | goto out; |
7aadf889 | 1089 | |
3d393e47 | 1090 | /* check whether the clients should not communicate due to AP |
9cfc7bd6 SE |
1091 | * isolation |
1092 | */ | |
a513088d SE |
1093 | if (tt_local_entry && |
1094 | _batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) | |
3d393e47 AQ |
1095 | goto out; |
1096 | ||
db08e6e5 | 1097 | best_tq = 0; |
c6c8fea2 | 1098 | |
db08e6e5 SW |
1099 | rcu_read_lock(); |
1100 | head = &tt_global_entry->orig_list; | |
1101 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
7d211efc | 1102 | router = batadv_orig_node_get_router(orig_entry->orig_node); |
db08e6e5 SW |
1103 | if (!router) |
1104 | continue; | |
c6c8fea2 | 1105 | |
db08e6e5 SW |
1106 | if (router->tq_avg > best_tq) { |
1107 | orig_node = orig_entry->orig_node; | |
1108 | best_tq = router->tq_avg; | |
1109 | } | |
7d211efc | 1110 | batadv_neigh_node_free_ref(router); |
db08e6e5 SW |
1111 | } |
1112 | /* found anything? */ | |
1113 | if (orig_node && !atomic_inc_not_zero(&orig_node->refcount)) | |
1114 | orig_node = NULL; | |
1115 | rcu_read_unlock(); | |
7b36e8ee | 1116 | out: |
3d393e47 | 1117 | if (tt_global_entry) |
a513088d | 1118 | batadv_tt_global_entry_free_ref(tt_global_entry); |
3d393e47 | 1119 | if (tt_local_entry) |
a513088d | 1120 | batadv_tt_local_entry_free_ref(tt_local_entry); |
3d393e47 | 1121 | |
7b36e8ee | 1122 | return orig_node; |
c6c8fea2 | 1123 | } |
a73105b8 AQ |
1124 | |
1125 | /* Calculates the checksum of the local table of a given orig_node */ | |
a513088d SE |
1126 | static uint16_t batadv_tt_global_crc(struct bat_priv *bat_priv, |
1127 | struct orig_node *orig_node) | |
a73105b8 AQ |
1128 | { |
1129 | uint16_t total = 0, total_one; | |
1130 | struct hashtable_t *hash = bat_priv->tt_global_hash; | |
48100bac | 1131 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
1132 | struct tt_global_entry *tt_global_entry; |
1133 | struct hlist_node *node; | |
1134 | struct hlist_head *head; | |
c90681b8 AQ |
1135 | uint32_t i; |
1136 | int j; | |
a73105b8 AQ |
1137 | |
1138 | for (i = 0; i < hash->size; i++) { | |
1139 | head = &hash->table[i]; | |
1140 | ||
1141 | rcu_read_lock(); | |
48100bac | 1142 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 | 1143 | head, hash_entry) { |
48100bac AQ |
1144 | tt_global_entry = container_of(tt_common_entry, |
1145 | struct tt_global_entry, | |
1146 | common); | |
db08e6e5 SW |
1147 | /* Roaming clients are in the global table for |
1148 | * consistency only. They don't have to be | |
1149 | * taken into account while computing the | |
1150 | * global crc | |
1151 | */ | |
1152 | if (tt_global_entry->common.flags & TT_CLIENT_ROAM) | |
1153 | continue; | |
1154 | ||
1155 | /* find out if this global entry is announced by this | |
1156 | * originator | |
1157 | */ | |
a513088d SE |
1158 | if (!batadv_tt_global_entry_has_orig(tt_global_entry, |
1159 | orig_node)) | |
db08e6e5 SW |
1160 | continue; |
1161 | ||
1162 | total_one = 0; | |
1163 | for (j = 0; j < ETH_ALEN; j++) | |
1164 | total_one = crc16_byte(total_one, | |
1165 | tt_global_entry->common.addr[j]); | |
1166 | total ^= total_one; | |
a73105b8 AQ |
1167 | } |
1168 | rcu_read_unlock(); | |
1169 | } | |
1170 | ||
1171 | return total; | |
1172 | } | |
1173 | ||
1174 | /* Calculates the checksum of the local table */ | |
be9aa4c1 | 1175 | static uint16_t batadv_tt_local_crc(struct bat_priv *bat_priv) |
a73105b8 AQ |
1176 | { |
1177 | uint16_t total = 0, total_one; | |
1178 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
48100bac | 1179 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
1180 | struct hlist_node *node; |
1181 | struct hlist_head *head; | |
c90681b8 AQ |
1182 | uint32_t i; |
1183 | int j; | |
a73105b8 AQ |
1184 | |
1185 | for (i = 0; i < hash->size; i++) { | |
1186 | head = &hash->table[i]; | |
1187 | ||
1188 | rcu_read_lock(); | |
48100bac | 1189 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 | 1190 | head, hash_entry) { |
058d0e26 | 1191 | /* not yet committed clients have not to be taken into |
9cfc7bd6 SE |
1192 | * account while computing the CRC |
1193 | */ | |
48100bac | 1194 | if (tt_common_entry->flags & TT_CLIENT_NEW) |
058d0e26 | 1195 | continue; |
a73105b8 AQ |
1196 | total_one = 0; |
1197 | for (j = 0; j < ETH_ALEN; j++) | |
1198 | total_one = crc16_byte(total_one, | |
48100bac | 1199 | tt_common_entry->addr[j]); |
a73105b8 AQ |
1200 | total ^= total_one; |
1201 | } | |
a73105b8 AQ |
1202 | rcu_read_unlock(); |
1203 | } | |
1204 | ||
1205 | return total; | |
1206 | } | |
1207 | ||
a513088d | 1208 | static void batadv_tt_req_list_free(struct bat_priv *bat_priv) |
a73105b8 AQ |
1209 | { |
1210 | struct tt_req_node *node, *safe; | |
1211 | ||
1212 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1213 | ||
1214 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
1215 | list_del(&node->list); | |
1216 | kfree(node); | |
1217 | } | |
1218 | ||
1219 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1220 | } | |
1221 | ||
a513088d SE |
1222 | static void batadv_tt_save_orig_buffer(struct bat_priv *bat_priv, |
1223 | struct orig_node *orig_node, | |
1224 | const unsigned char *tt_buff, | |
1225 | uint8_t tt_num_changes) | |
a73105b8 | 1226 | { |
08c36d3e | 1227 | uint16_t tt_buff_len = batadv_tt_len(tt_num_changes); |
a73105b8 AQ |
1228 | |
1229 | /* Replace the old buffer only if I received something in the | |
9cfc7bd6 SE |
1230 | * last OGM (the OGM could carry no changes) |
1231 | */ | |
a73105b8 AQ |
1232 | spin_lock_bh(&orig_node->tt_buff_lock); |
1233 | if (tt_buff_len > 0) { | |
1234 | kfree(orig_node->tt_buff); | |
1235 | orig_node->tt_buff_len = 0; | |
1236 | orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); | |
1237 | if (orig_node->tt_buff) { | |
1238 | memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); | |
1239 | orig_node->tt_buff_len = tt_buff_len; | |
1240 | } | |
1241 | } | |
1242 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1243 | } | |
1244 | ||
a513088d | 1245 | static void batadv_tt_req_purge(struct bat_priv *bat_priv) |
a73105b8 AQ |
1246 | { |
1247 | struct tt_req_node *node, *safe; | |
1248 | ||
1249 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1250 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
1eda58bf | 1251 | if (batadv_has_timed_out(node->issued_at, TT_REQUEST_TIMEOUT)) { |
a73105b8 AQ |
1252 | list_del(&node->list); |
1253 | kfree(node); | |
1254 | } | |
1255 | } | |
1256 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1257 | } | |
1258 | ||
1259 | /* returns the pointer to the new tt_req_node struct if no request | |
9cfc7bd6 SE |
1260 | * has already been issued for this orig_node, NULL otherwise |
1261 | */ | |
a513088d SE |
1262 | static struct tt_req_node *batadv_new_tt_req_node(struct bat_priv *bat_priv, |
1263 | struct orig_node *orig_node) | |
a73105b8 AQ |
1264 | { |
1265 | struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; | |
1266 | ||
1267 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1268 | list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) { | |
1eda58bf SE |
1269 | if (batadv_compare_eth(tt_req_node_tmp, orig_node) && |
1270 | !batadv_has_timed_out(tt_req_node_tmp->issued_at, | |
1271 | TT_REQUEST_TIMEOUT)) | |
a73105b8 AQ |
1272 | goto unlock; |
1273 | } | |
1274 | ||
1275 | tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); | |
1276 | if (!tt_req_node) | |
1277 | goto unlock; | |
1278 | ||
1279 | memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); | |
1280 | tt_req_node->issued_at = jiffies; | |
1281 | ||
1282 | list_add(&tt_req_node->list, &bat_priv->tt_req_list); | |
1283 | unlock: | |
1284 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1285 | return tt_req_node; | |
1286 | } | |
1287 | ||
058d0e26 | 1288 | /* data_ptr is useless here, but has to be kept to respect the prototype */ |
a513088d SE |
1289 | static int batadv_tt_local_valid_entry(const void *entry_ptr, |
1290 | const void *data_ptr) | |
058d0e26 | 1291 | { |
48100bac | 1292 | const struct tt_common_entry *tt_common_entry = entry_ptr; |
058d0e26 | 1293 | |
48100bac | 1294 | if (tt_common_entry->flags & TT_CLIENT_NEW) |
058d0e26 AQ |
1295 | return 0; |
1296 | return 1; | |
1297 | } | |
1298 | ||
a513088d SE |
1299 | static int batadv_tt_global_valid(const void *entry_ptr, |
1300 | const void *data_ptr) | |
a73105b8 | 1301 | { |
48100bac AQ |
1302 | const struct tt_common_entry *tt_common_entry = entry_ptr; |
1303 | const struct tt_global_entry *tt_global_entry; | |
a73105b8 AQ |
1304 | const struct orig_node *orig_node = data_ptr; |
1305 | ||
48100bac | 1306 | if (tt_common_entry->flags & TT_CLIENT_ROAM) |
cc47f66e AQ |
1307 | return 0; |
1308 | ||
48100bac AQ |
1309 | tt_global_entry = container_of(tt_common_entry, struct tt_global_entry, |
1310 | common); | |
1311 | ||
a513088d | 1312 | return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node); |
a73105b8 AQ |
1313 | } |
1314 | ||
a513088d SE |
1315 | static struct sk_buff * |
1316 | batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, | |
1317 | struct hashtable_t *hash, | |
1318 | struct hard_iface *primary_if, | |
1319 | int (*valid_cb)(const void *, const void *), | |
1320 | void *cb_data) | |
a73105b8 | 1321 | { |
48100bac | 1322 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
1323 | struct tt_query_packet *tt_response; |
1324 | struct tt_change *tt_change; | |
1325 | struct hlist_node *node; | |
1326 | struct hlist_head *head; | |
1327 | struct sk_buff *skb = NULL; | |
1328 | uint16_t tt_tot, tt_count; | |
1329 | ssize_t tt_query_size = sizeof(struct tt_query_packet); | |
c90681b8 | 1330 | uint32_t i; |
a73105b8 AQ |
1331 | |
1332 | if (tt_query_size + tt_len > primary_if->soft_iface->mtu) { | |
1333 | tt_len = primary_if->soft_iface->mtu - tt_query_size; | |
1334 | tt_len -= tt_len % sizeof(struct tt_change); | |
1335 | } | |
1336 | tt_tot = tt_len / sizeof(struct tt_change); | |
1337 | ||
1338 | skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN); | |
1339 | if (!skb) | |
1340 | goto out; | |
1341 | ||
1342 | skb_reserve(skb, ETH_HLEN); | |
1343 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1344 | tt_query_size + tt_len); | |
1345 | tt_response->ttvn = ttvn; | |
a73105b8 AQ |
1346 | |
1347 | tt_change = (struct tt_change *)(skb->data + tt_query_size); | |
1348 | tt_count = 0; | |
1349 | ||
1350 | rcu_read_lock(); | |
1351 | for (i = 0; i < hash->size; i++) { | |
1352 | head = &hash->table[i]; | |
1353 | ||
48100bac | 1354 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 AQ |
1355 | head, hash_entry) { |
1356 | if (tt_count == tt_tot) | |
1357 | break; | |
1358 | ||
48100bac | 1359 | if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data))) |
a73105b8 AQ |
1360 | continue; |
1361 | ||
48100bac AQ |
1362 | memcpy(tt_change->addr, tt_common_entry->addr, |
1363 | ETH_ALEN); | |
a73105b8 AQ |
1364 | tt_change->flags = NO_FLAGS; |
1365 | ||
1366 | tt_count++; | |
1367 | tt_change++; | |
1368 | } | |
1369 | } | |
1370 | rcu_read_unlock(); | |
1371 | ||
9d852393 | 1372 | /* store in the message the number of entries we have successfully |
9cfc7bd6 SE |
1373 | * copied |
1374 | */ | |
9d852393 AQ |
1375 | tt_response->tt_data = htons(tt_count); |
1376 | ||
a73105b8 AQ |
1377 | out: |
1378 | return skb; | |
1379 | } | |
1380 | ||
a513088d SE |
1381 | static int batadv_send_tt_request(struct bat_priv *bat_priv, |
1382 | struct orig_node *dst_orig_node, | |
1383 | uint8_t ttvn, uint16_t tt_crc, | |
1384 | bool full_table) | |
a73105b8 AQ |
1385 | { |
1386 | struct sk_buff *skb = NULL; | |
1387 | struct tt_query_packet *tt_request; | |
1388 | struct neigh_node *neigh_node = NULL; | |
1389 | struct hard_iface *primary_if; | |
1390 | struct tt_req_node *tt_req_node = NULL; | |
1391 | int ret = 1; | |
1392 | ||
e5d89254 | 1393 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1394 | if (!primary_if) |
1395 | goto out; | |
1396 | ||
1397 | /* The new tt_req will be issued only if I'm not waiting for a | |
9cfc7bd6 SE |
1398 | * reply from the same orig_node yet |
1399 | */ | |
a513088d | 1400 | tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node); |
a73105b8 AQ |
1401 | if (!tt_req_node) |
1402 | goto out; | |
1403 | ||
1404 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN); | |
1405 | if (!skb) | |
1406 | goto out; | |
1407 | ||
1408 | skb_reserve(skb, ETH_HLEN); | |
1409 | ||
1410 | tt_request = (struct tt_query_packet *)skb_put(skb, | |
1411 | sizeof(struct tt_query_packet)); | |
1412 | ||
76543d14 SE |
1413 | tt_request->header.packet_type = BAT_TT_QUERY; |
1414 | tt_request->header.version = COMPAT_VERSION; | |
a73105b8 AQ |
1415 | memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1416 | memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN); | |
76543d14 | 1417 | tt_request->header.ttl = TTL; |
a73105b8 | 1418 | tt_request->ttvn = ttvn; |
6d2003fc | 1419 | tt_request->tt_data = htons(tt_crc); |
a73105b8 AQ |
1420 | tt_request->flags = TT_REQUEST; |
1421 | ||
1422 | if (full_table) | |
1423 | tt_request->flags |= TT_FULL_TABLE; | |
1424 | ||
7d211efc | 1425 | neigh_node = batadv_orig_node_get_router(dst_orig_node); |
a73105b8 AQ |
1426 | if (!neigh_node) |
1427 | goto out; | |
1428 | ||
1eda58bf SE |
1429 | batadv_dbg(DBG_TT, bat_priv, |
1430 | "Sending TT_REQUEST to %pM via %pM [%c]\n", | |
1431 | dst_orig_node->orig, neigh_node->addr, | |
1432 | (full_table ? 'F' : '.')); | |
a73105b8 | 1433 | |
f8214865 MH |
1434 | batadv_inc_counter(bat_priv, BAT_CNT_TT_REQUEST_TX); |
1435 | ||
9455e34c | 1436 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1437 | ret = 0; |
1438 | ||
1439 | out: | |
1440 | if (neigh_node) | |
7d211efc | 1441 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1442 | if (primary_if) |
e5d89254 | 1443 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1444 | if (ret) |
1445 | kfree_skb(skb); | |
1446 | if (ret && tt_req_node) { | |
1447 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1448 | list_del(&tt_req_node->list); | |
1449 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1450 | kfree(tt_req_node); | |
1451 | } | |
1452 | return ret; | |
1453 | } | |
1454 | ||
a513088d SE |
1455 | static bool batadv_send_other_tt_response(struct bat_priv *bat_priv, |
1456 | struct tt_query_packet *tt_request) | |
a73105b8 AQ |
1457 | { |
1458 | struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL; | |
1459 | struct neigh_node *neigh_node = NULL; | |
1460 | struct hard_iface *primary_if = NULL; | |
1461 | uint8_t orig_ttvn, req_ttvn, ttvn; | |
1462 | int ret = false; | |
1463 | unsigned char *tt_buff; | |
1464 | bool full_table; | |
1465 | uint16_t tt_len, tt_tot; | |
1466 | struct sk_buff *skb = NULL; | |
1467 | struct tt_query_packet *tt_response; | |
1468 | ||
1eda58bf SE |
1469 | batadv_dbg(DBG_TT, bat_priv, |
1470 | "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", | |
1471 | tt_request->src, tt_request->ttvn, tt_request->dst, | |
1472 | (tt_request->flags & TT_FULL_TABLE ? 'F' : '.')); | |
a73105b8 AQ |
1473 | |
1474 | /* Let's get the orig node of the REAL destination */ | |
da641193 | 1475 | req_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->dst); |
a73105b8 AQ |
1476 | if (!req_dst_orig_node) |
1477 | goto out; | |
1478 | ||
da641193 | 1479 | res_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1480 | if (!res_dst_orig_node) |
1481 | goto out; | |
1482 | ||
7d211efc | 1483 | neigh_node = batadv_orig_node_get_router(res_dst_orig_node); |
a73105b8 AQ |
1484 | if (!neigh_node) |
1485 | goto out; | |
1486 | ||
e5d89254 | 1487 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1488 | if (!primary_if) |
1489 | goto out; | |
1490 | ||
1491 | orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1492 | req_ttvn = tt_request->ttvn; | |
1493 | ||
015758d0 | 1494 | /* I don't have the requested data */ |
a73105b8 | 1495 | if (orig_ttvn != req_ttvn || |
f25bd58a | 1496 | tt_request->tt_data != htons(req_dst_orig_node->tt_crc)) |
a73105b8 AQ |
1497 | goto out; |
1498 | ||
015758d0 | 1499 | /* If the full table has been explicitly requested */ |
a73105b8 AQ |
1500 | if (tt_request->flags & TT_FULL_TABLE || |
1501 | !req_dst_orig_node->tt_buff) | |
1502 | full_table = true; | |
1503 | else | |
1504 | full_table = false; | |
1505 | ||
1506 | /* In this version, fragmentation is not implemented, then | |
9cfc7bd6 SE |
1507 | * I'll send only one packet with as much TT entries as I can |
1508 | */ | |
a73105b8 AQ |
1509 | if (!full_table) { |
1510 | spin_lock_bh(&req_dst_orig_node->tt_buff_lock); | |
1511 | tt_len = req_dst_orig_node->tt_buff_len; | |
1512 | tt_tot = tt_len / sizeof(struct tt_change); | |
1513 | ||
1514 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + | |
1515 | tt_len + ETH_HLEN); | |
1516 | if (!skb) | |
1517 | goto unlock; | |
1518 | ||
1519 | skb_reserve(skb, ETH_HLEN); | |
1520 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1521 | sizeof(struct tt_query_packet) + tt_len); | |
1522 | tt_response->ttvn = req_ttvn; | |
1523 | tt_response->tt_data = htons(tt_tot); | |
1524 | ||
1525 | tt_buff = skb->data + sizeof(struct tt_query_packet); | |
1526 | /* Copy the last orig_node's OGM buffer */ | |
1527 | memcpy(tt_buff, req_dst_orig_node->tt_buff, | |
1528 | req_dst_orig_node->tt_buff_len); | |
1529 | ||
1530 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1531 | } else { | |
1532 | tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) * | |
1533 | sizeof(struct tt_change); | |
1534 | ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1535 | ||
a513088d SE |
1536 | skb = batadv_tt_response_fill_table(tt_len, ttvn, |
1537 | bat_priv->tt_global_hash, | |
1538 | primary_if, | |
1539 | batadv_tt_global_valid, | |
1540 | req_dst_orig_node); | |
a73105b8 AQ |
1541 | if (!skb) |
1542 | goto out; | |
1543 | ||
1544 | tt_response = (struct tt_query_packet *)skb->data; | |
1545 | } | |
1546 | ||
76543d14 SE |
1547 | tt_response->header.packet_type = BAT_TT_QUERY; |
1548 | tt_response->header.version = COMPAT_VERSION; | |
1549 | tt_response->header.ttl = TTL; | |
a73105b8 AQ |
1550 | memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN); |
1551 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
1552 | tt_response->flags = TT_RESPONSE; | |
1553 | ||
1554 | if (full_table) | |
1555 | tt_response->flags |= TT_FULL_TABLE; | |
1556 | ||
1eda58bf SE |
1557 | batadv_dbg(DBG_TT, bat_priv, |
1558 | "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n", | |
1559 | res_dst_orig_node->orig, neigh_node->addr, | |
1560 | req_dst_orig_node->orig, req_ttvn); | |
a73105b8 | 1561 | |
f8214865 MH |
1562 | batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_TX); |
1563 | ||
9455e34c | 1564 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1565 | ret = true; |
1566 | goto out; | |
1567 | ||
1568 | unlock: | |
1569 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1570 | ||
1571 | out: | |
1572 | if (res_dst_orig_node) | |
7d211efc | 1573 | batadv_orig_node_free_ref(res_dst_orig_node); |
a73105b8 | 1574 | if (req_dst_orig_node) |
7d211efc | 1575 | batadv_orig_node_free_ref(req_dst_orig_node); |
a73105b8 | 1576 | if (neigh_node) |
7d211efc | 1577 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1578 | if (primary_if) |
e5d89254 | 1579 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1580 | if (!ret) |
1581 | kfree_skb(skb); | |
1582 | return ret; | |
1583 | ||
1584 | } | |
a513088d SE |
1585 | static bool batadv_send_my_tt_response(struct bat_priv *bat_priv, |
1586 | struct tt_query_packet *tt_request) | |
a73105b8 AQ |
1587 | { |
1588 | struct orig_node *orig_node = NULL; | |
1589 | struct neigh_node *neigh_node = NULL; | |
1590 | struct hard_iface *primary_if = NULL; | |
1591 | uint8_t my_ttvn, req_ttvn, ttvn; | |
1592 | int ret = false; | |
1593 | unsigned char *tt_buff; | |
1594 | bool full_table; | |
1595 | uint16_t tt_len, tt_tot; | |
1596 | struct sk_buff *skb = NULL; | |
1597 | struct tt_query_packet *tt_response; | |
1598 | ||
1eda58bf SE |
1599 | batadv_dbg(DBG_TT, bat_priv, |
1600 | "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", | |
1601 | tt_request->src, tt_request->ttvn, | |
1602 | (tt_request->flags & TT_FULL_TABLE ? 'F' : '.')); | |
a73105b8 AQ |
1603 | |
1604 | ||
1605 | my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1606 | req_ttvn = tt_request->ttvn; | |
1607 | ||
da641193 | 1608 | orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1609 | if (!orig_node) |
1610 | goto out; | |
1611 | ||
7d211efc | 1612 | neigh_node = batadv_orig_node_get_router(orig_node); |
a73105b8 AQ |
1613 | if (!neigh_node) |
1614 | goto out; | |
1615 | ||
e5d89254 | 1616 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1617 | if (!primary_if) |
1618 | goto out; | |
1619 | ||
1620 | /* If the full table has been explicitly requested or the gap | |
9cfc7bd6 SE |
1621 | * is too big send the whole local translation table |
1622 | */ | |
a73105b8 AQ |
1623 | if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn || |
1624 | !bat_priv->tt_buff) | |
1625 | full_table = true; | |
1626 | else | |
1627 | full_table = false; | |
1628 | ||
1629 | /* In this version, fragmentation is not implemented, then | |
9cfc7bd6 SE |
1630 | * I'll send only one packet with as much TT entries as I can |
1631 | */ | |
a73105b8 AQ |
1632 | if (!full_table) { |
1633 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
1634 | tt_len = bat_priv->tt_buff_len; | |
1635 | tt_tot = tt_len / sizeof(struct tt_change); | |
1636 | ||
1637 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + | |
1638 | tt_len + ETH_HLEN); | |
1639 | if (!skb) | |
1640 | goto unlock; | |
1641 | ||
1642 | skb_reserve(skb, ETH_HLEN); | |
1643 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1644 | sizeof(struct tt_query_packet) + tt_len); | |
1645 | tt_response->ttvn = req_ttvn; | |
1646 | tt_response->tt_data = htons(tt_tot); | |
1647 | ||
1648 | tt_buff = skb->data + sizeof(struct tt_query_packet); | |
1649 | memcpy(tt_buff, bat_priv->tt_buff, | |
1650 | bat_priv->tt_buff_len); | |
1651 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1652 | } else { | |
1653 | tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) * | |
1654 | sizeof(struct tt_change); | |
1655 | ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1656 | ||
a513088d SE |
1657 | skb = batadv_tt_response_fill_table(tt_len, ttvn, |
1658 | bat_priv->tt_local_hash, | |
1659 | primary_if, | |
1660 | batadv_tt_local_valid_entry, | |
1661 | NULL); | |
a73105b8 AQ |
1662 | if (!skb) |
1663 | goto out; | |
1664 | ||
1665 | tt_response = (struct tt_query_packet *)skb->data; | |
1666 | } | |
1667 | ||
76543d14 SE |
1668 | tt_response->header.packet_type = BAT_TT_QUERY; |
1669 | tt_response->header.version = COMPAT_VERSION; | |
1670 | tt_response->header.ttl = TTL; | |
a73105b8 AQ |
1671 | memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1672 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
1673 | tt_response->flags = TT_RESPONSE; | |
1674 | ||
1675 | if (full_table) | |
1676 | tt_response->flags |= TT_FULL_TABLE; | |
1677 | ||
1eda58bf SE |
1678 | batadv_dbg(DBG_TT, bat_priv, |
1679 | "Sending TT_RESPONSE to %pM via %pM [%c]\n", | |
1680 | orig_node->orig, neigh_node->addr, | |
1681 | (tt_response->flags & TT_FULL_TABLE ? 'F' : '.')); | |
a73105b8 | 1682 | |
f8214865 MH |
1683 | batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_TX); |
1684 | ||
9455e34c | 1685 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1686 | ret = true; |
1687 | goto out; | |
1688 | ||
1689 | unlock: | |
1690 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1691 | out: | |
1692 | if (orig_node) | |
7d211efc | 1693 | batadv_orig_node_free_ref(orig_node); |
a73105b8 | 1694 | if (neigh_node) |
7d211efc | 1695 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1696 | if (primary_if) |
e5d89254 | 1697 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1698 | if (!ret) |
1699 | kfree_skb(skb); | |
1700 | /* This packet was for me, so it doesn't need to be re-routed */ | |
1701 | return true; | |
1702 | } | |
1703 | ||
08c36d3e SE |
1704 | bool batadv_send_tt_response(struct bat_priv *bat_priv, |
1705 | struct tt_query_packet *tt_request) | |
a73105b8 | 1706 | { |
3193e8fd | 1707 | if (batadv_is_my_mac(tt_request->dst)) { |
20ff9d59 | 1708 | /* don't answer backbone gws! */ |
08adf151 | 1709 | if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src)) |
20ff9d59 SW |
1710 | return true; |
1711 | ||
a513088d | 1712 | return batadv_send_my_tt_response(bat_priv, tt_request); |
20ff9d59 | 1713 | } else { |
a513088d | 1714 | return batadv_send_other_tt_response(bat_priv, tt_request); |
20ff9d59 | 1715 | } |
a73105b8 AQ |
1716 | } |
1717 | ||
a513088d SE |
1718 | static void _batadv_tt_update_changes(struct bat_priv *bat_priv, |
1719 | struct orig_node *orig_node, | |
1720 | struct tt_change *tt_change, | |
1721 | uint16_t tt_num_changes, uint8_t ttvn) | |
a73105b8 AQ |
1722 | { |
1723 | int i; | |
08c36d3e | 1724 | int is_wifi; |
a513088d | 1725 | int roams; |
a73105b8 AQ |
1726 | |
1727 | for (i = 0; i < tt_num_changes; i++) { | |
08c36d3e | 1728 | if ((tt_change + i)->flags & TT_CLIENT_DEL) { |
a513088d SE |
1729 | roams = (tt_change + i)->flags & TT_CLIENT_ROAM; |
1730 | batadv_tt_global_del(bat_priv, orig_node, | |
1731 | (tt_change + i)->addr, | |
1732 | "tt removed by changes", | |
1733 | roams); | |
08c36d3e SE |
1734 | } else { |
1735 | is_wifi = (tt_change + i)->flags & TT_CLIENT_WIFI; | |
1736 | if (!batadv_tt_global_add(bat_priv, orig_node, | |
1737 | (tt_change + i)->addr, ttvn, | |
1738 | false, is_wifi)) | |
a73105b8 AQ |
1739 | /* In case of problem while storing a |
1740 | * global_entry, we stop the updating | |
1741 | * procedure without committing the | |
1742 | * ttvn change. This will avoid to send | |
1743 | * corrupted data on tt_request | |
1744 | */ | |
1745 | return; | |
08c36d3e | 1746 | } |
a73105b8 | 1747 | } |
17071578 | 1748 | orig_node->tt_initialised = true; |
a73105b8 AQ |
1749 | } |
1750 | ||
a513088d SE |
1751 | static void batadv_tt_fill_gtable(struct bat_priv *bat_priv, |
1752 | struct tt_query_packet *tt_response) | |
a73105b8 AQ |
1753 | { |
1754 | struct orig_node *orig_node = NULL; | |
1755 | ||
da641193 | 1756 | orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); |
a73105b8 AQ |
1757 | if (!orig_node) |
1758 | goto out; | |
1759 | ||
1760 | /* Purge the old table first.. */ | |
08c36d3e | 1761 | batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table"); |
a73105b8 | 1762 | |
a513088d SE |
1763 | _batadv_tt_update_changes(bat_priv, orig_node, |
1764 | (struct tt_change *)(tt_response + 1), | |
1765 | ntohs(tt_response->tt_data), | |
1766 | tt_response->ttvn); | |
a73105b8 AQ |
1767 | |
1768 | spin_lock_bh(&orig_node->tt_buff_lock); | |
1769 | kfree(orig_node->tt_buff); | |
1770 | orig_node->tt_buff_len = 0; | |
1771 | orig_node->tt_buff = NULL; | |
1772 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1773 | ||
1774 | atomic_set(&orig_node->last_ttvn, tt_response->ttvn); | |
1775 | ||
1776 | out: | |
1777 | if (orig_node) | |
7d211efc | 1778 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
1779 | } |
1780 | ||
a513088d SE |
1781 | static void batadv_tt_update_changes(struct bat_priv *bat_priv, |
1782 | struct orig_node *orig_node, | |
1783 | uint16_t tt_num_changes, uint8_t ttvn, | |
1784 | struct tt_change *tt_change) | |
a73105b8 | 1785 | { |
a513088d SE |
1786 | _batadv_tt_update_changes(bat_priv, orig_node, tt_change, |
1787 | tt_num_changes, ttvn); | |
a73105b8 | 1788 | |
a513088d SE |
1789 | batadv_tt_save_orig_buffer(bat_priv, orig_node, |
1790 | (unsigned char *)tt_change, tt_num_changes); | |
a73105b8 AQ |
1791 | atomic_set(&orig_node->last_ttvn, ttvn); |
1792 | } | |
1793 | ||
08c36d3e | 1794 | bool batadv_is_my_client(struct bat_priv *bat_priv, const uint8_t *addr) |
a73105b8 | 1795 | { |
7683fdc1 AQ |
1796 | struct tt_local_entry *tt_local_entry = NULL; |
1797 | bool ret = false; | |
a73105b8 | 1798 | |
a513088d | 1799 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
1800 | if (!tt_local_entry) |
1801 | goto out; | |
058d0e26 | 1802 | /* Check if the client has been logically deleted (but is kept for |
9cfc7bd6 SE |
1803 | * consistency purpose) |
1804 | */ | |
48100bac | 1805 | if (tt_local_entry->common.flags & TT_CLIENT_PENDING) |
058d0e26 | 1806 | goto out; |
7683fdc1 AQ |
1807 | ret = true; |
1808 | out: | |
a73105b8 | 1809 | if (tt_local_entry) |
a513088d | 1810 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7683fdc1 | 1811 | return ret; |
a73105b8 AQ |
1812 | } |
1813 | ||
08c36d3e SE |
1814 | void batadv_handle_tt_response(struct bat_priv *bat_priv, |
1815 | struct tt_query_packet *tt_response) | |
a73105b8 AQ |
1816 | { |
1817 | struct tt_req_node *node, *safe; | |
1818 | struct orig_node *orig_node = NULL; | |
1819 | ||
1eda58bf SE |
1820 | batadv_dbg(DBG_TT, bat_priv, |
1821 | "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", | |
1822 | tt_response->src, tt_response->ttvn, | |
1823 | ntohs(tt_response->tt_data), | |
1824 | (tt_response->flags & TT_FULL_TABLE ? 'F' : '.')); | |
a73105b8 | 1825 | |
20ff9d59 | 1826 | /* we should have never asked a backbone gw */ |
08adf151 | 1827 | if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src)) |
20ff9d59 SW |
1828 | goto out; |
1829 | ||
da641193 | 1830 | orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); |
a73105b8 AQ |
1831 | if (!orig_node) |
1832 | goto out; | |
1833 | ||
1834 | if (tt_response->flags & TT_FULL_TABLE) | |
a513088d | 1835 | batadv_tt_fill_gtable(bat_priv, tt_response); |
a73105b8 | 1836 | else |
a513088d SE |
1837 | batadv_tt_update_changes(bat_priv, orig_node, |
1838 | ntohs(tt_response->tt_data), | |
1839 | tt_response->ttvn, | |
1840 | (struct tt_change *)(tt_response + 1)); | |
a73105b8 AQ |
1841 | |
1842 | /* Delete the tt_req_node from pending tt_requests list */ | |
1843 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1844 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
1eda58bf | 1845 | if (!batadv_compare_eth(node->addr, tt_response->src)) |
a73105b8 AQ |
1846 | continue; |
1847 | list_del(&node->list); | |
1848 | kfree(node); | |
1849 | } | |
1850 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1851 | ||
1852 | /* Recalculate the CRC for this orig_node and store it */ | |
a513088d | 1853 | orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); |
cc47f66e | 1854 | /* Roaming phase is over: tables are in sync again. I can |
9cfc7bd6 SE |
1855 | * unset the flag |
1856 | */ | |
cc47f66e | 1857 | orig_node->tt_poss_change = false; |
a73105b8 AQ |
1858 | out: |
1859 | if (orig_node) | |
7d211efc | 1860 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
1861 | } |
1862 | ||
08c36d3e | 1863 | int batadv_tt_init(struct bat_priv *bat_priv) |
a73105b8 | 1864 | { |
5346c35e | 1865 | int ret; |
a73105b8 | 1866 | |
a513088d | 1867 | ret = batadv_tt_local_init(bat_priv); |
5346c35e SE |
1868 | if (ret < 0) |
1869 | return ret; | |
1870 | ||
a513088d | 1871 | ret = batadv_tt_global_init(bat_priv); |
5346c35e SE |
1872 | if (ret < 0) |
1873 | return ret; | |
a73105b8 | 1874 | |
a513088d | 1875 | batadv_tt_start_timer(bat_priv); |
a73105b8 AQ |
1876 | |
1877 | return 1; | |
1878 | } | |
1879 | ||
a513088d | 1880 | static void batadv_tt_roam_list_free(struct bat_priv *bat_priv) |
a73105b8 | 1881 | { |
cc47f66e | 1882 | struct tt_roam_node *node, *safe; |
a73105b8 | 1883 | |
cc47f66e | 1884 | spin_lock_bh(&bat_priv->tt_roam_list_lock); |
a73105b8 | 1885 | |
cc47f66e AQ |
1886 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { |
1887 | list_del(&node->list); | |
1888 | kfree(node); | |
1889 | } | |
1890 | ||
1891 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1892 | } | |
1893 | ||
a513088d | 1894 | static void batadv_tt_roam_purge(struct bat_priv *bat_priv) |
cc47f66e AQ |
1895 | { |
1896 | struct tt_roam_node *node, *safe; | |
1897 | ||
1898 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1899 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { | |
1eda58bf | 1900 | if (!batadv_has_timed_out(node->first_time, ROAMING_MAX_TIME)) |
cc47f66e AQ |
1901 | continue; |
1902 | ||
1903 | list_del(&node->list); | |
1904 | kfree(node); | |
1905 | } | |
1906 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1907 | } | |
1908 | ||
1909 | /* This function checks whether the client already reached the | |
1910 | * maximum number of possible roaming phases. In this case the ROAMING_ADV | |
1911 | * will not be sent. | |
1912 | * | |
9cfc7bd6 SE |
1913 | * returns true if the ROAMING_ADV can be sent, false otherwise |
1914 | */ | |
a513088d SE |
1915 | static bool batadv_tt_check_roam_count(struct bat_priv *bat_priv, |
1916 | uint8_t *client) | |
cc47f66e AQ |
1917 | { |
1918 | struct tt_roam_node *tt_roam_node; | |
1919 | bool ret = false; | |
1920 | ||
1921 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1922 | /* The new tt_req will be issued only if I'm not waiting for a | |
9cfc7bd6 SE |
1923 | * reply from the same orig_node yet |
1924 | */ | |
cc47f66e | 1925 | list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) { |
1eda58bf | 1926 | if (!batadv_compare_eth(tt_roam_node->addr, client)) |
cc47f66e AQ |
1927 | continue; |
1928 | ||
1eda58bf SE |
1929 | if (batadv_has_timed_out(tt_roam_node->first_time, |
1930 | ROAMING_MAX_TIME)) | |
cc47f66e AQ |
1931 | continue; |
1932 | ||
1933 | if (!atomic_dec_not_zero(&tt_roam_node->counter)) | |
1934 | /* Sorry, you roamed too many times! */ | |
1935 | goto unlock; | |
1936 | ret = true; | |
1937 | break; | |
1938 | } | |
1939 | ||
1940 | if (!ret) { | |
1941 | tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); | |
1942 | if (!tt_roam_node) | |
1943 | goto unlock; | |
1944 | ||
1945 | tt_roam_node->first_time = jiffies; | |
1946 | atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1); | |
1947 | memcpy(tt_roam_node->addr, client, ETH_ALEN); | |
1948 | ||
1949 | list_add(&tt_roam_node->list, &bat_priv->tt_roam_list); | |
1950 | ret = true; | |
1951 | } | |
1952 | ||
1953 | unlock: | |
1954 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1955 | return ret; | |
1956 | } | |
1957 | ||
a513088d SE |
1958 | static void batadv_send_roam_adv(struct bat_priv *bat_priv, uint8_t *client, |
1959 | struct orig_node *orig_node) | |
cc47f66e AQ |
1960 | { |
1961 | struct neigh_node *neigh_node = NULL; | |
1962 | struct sk_buff *skb = NULL; | |
1963 | struct roam_adv_packet *roam_adv_packet; | |
1964 | int ret = 1; | |
1965 | struct hard_iface *primary_if; | |
1966 | ||
1967 | /* before going on we have to check whether the client has | |
9cfc7bd6 SE |
1968 | * already roamed to us too many times |
1969 | */ | |
a513088d | 1970 | if (!batadv_tt_check_roam_count(bat_priv, client)) |
cc47f66e AQ |
1971 | goto out; |
1972 | ||
1973 | skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN); | |
1974 | if (!skb) | |
1975 | goto out; | |
1976 | ||
1977 | skb_reserve(skb, ETH_HLEN); | |
1978 | ||
1979 | roam_adv_packet = (struct roam_adv_packet *)skb_put(skb, | |
1980 | sizeof(struct roam_adv_packet)); | |
1981 | ||
76543d14 SE |
1982 | roam_adv_packet->header.packet_type = BAT_ROAM_ADV; |
1983 | roam_adv_packet->header.version = COMPAT_VERSION; | |
1984 | roam_adv_packet->header.ttl = TTL; | |
e5d89254 | 1985 | primary_if = batadv_primary_if_get_selected(bat_priv); |
cc47f66e AQ |
1986 | if (!primary_if) |
1987 | goto out; | |
1988 | memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN); | |
e5d89254 | 1989 | batadv_hardif_free_ref(primary_if); |
cc47f66e AQ |
1990 | memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN); |
1991 | memcpy(roam_adv_packet->client, client, ETH_ALEN); | |
1992 | ||
7d211efc | 1993 | neigh_node = batadv_orig_node_get_router(orig_node); |
cc47f66e AQ |
1994 | if (!neigh_node) |
1995 | goto out; | |
1996 | ||
1eda58bf SE |
1997 | batadv_dbg(DBG_TT, bat_priv, |
1998 | "Sending ROAMING_ADV to %pM (client %pM) via %pM\n", | |
1999 | orig_node->orig, client, neigh_node->addr); | |
cc47f66e | 2000 | |
f8214865 MH |
2001 | batadv_inc_counter(bat_priv, BAT_CNT_TT_ROAM_ADV_TX); |
2002 | ||
9455e34c | 2003 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
cc47f66e AQ |
2004 | ret = 0; |
2005 | ||
2006 | out: | |
2007 | if (neigh_node) | |
7d211efc | 2008 | batadv_neigh_node_free_ref(neigh_node); |
cc47f66e AQ |
2009 | if (ret) |
2010 | kfree_skb(skb); | |
2011 | return; | |
a73105b8 AQ |
2012 | } |
2013 | ||
a513088d | 2014 | static void batadv_tt_purge(struct work_struct *work) |
a73105b8 AQ |
2015 | { |
2016 | struct delayed_work *delayed_work = | |
2017 | container_of(work, struct delayed_work, work); | |
2018 | struct bat_priv *bat_priv = | |
2019 | container_of(delayed_work, struct bat_priv, tt_work); | |
2020 | ||
a513088d SE |
2021 | batadv_tt_local_purge(bat_priv); |
2022 | batadv_tt_global_roam_purge(bat_priv); | |
2023 | batadv_tt_req_purge(bat_priv); | |
2024 | batadv_tt_roam_purge(bat_priv); | |
a73105b8 | 2025 | |
a513088d | 2026 | batadv_tt_start_timer(bat_priv); |
a73105b8 | 2027 | } |
cc47f66e | 2028 | |
08c36d3e | 2029 | void batadv_tt_free(struct bat_priv *bat_priv) |
cc47f66e AQ |
2030 | { |
2031 | cancel_delayed_work_sync(&bat_priv->tt_work); | |
2032 | ||
a513088d SE |
2033 | batadv_tt_local_table_free(bat_priv); |
2034 | batadv_tt_global_table_free(bat_priv); | |
2035 | batadv_tt_req_list_free(bat_priv); | |
2036 | batadv_tt_changes_list_free(bat_priv); | |
2037 | batadv_tt_roam_list_free(bat_priv); | |
cc47f66e AQ |
2038 | |
2039 | kfree(bat_priv->tt_buff); | |
2040 | } | |
058d0e26 | 2041 | |
697f2531 | 2042 | /* This function will enable or disable the specified flags for all the entries |
9cfc7bd6 SE |
2043 | * in the given hash table and returns the number of modified entries |
2044 | */ | |
a513088d SE |
2045 | static uint16_t batadv_tt_set_flags(struct hashtable_t *hash, uint16_t flags, |
2046 | bool enable) | |
058d0e26 | 2047 | { |
c90681b8 | 2048 | uint32_t i; |
697f2531 | 2049 | uint16_t changed_num = 0; |
058d0e26 AQ |
2050 | struct hlist_head *head; |
2051 | struct hlist_node *node; | |
48100bac | 2052 | struct tt_common_entry *tt_common_entry; |
058d0e26 AQ |
2053 | |
2054 | if (!hash) | |
697f2531 | 2055 | goto out; |
058d0e26 AQ |
2056 | |
2057 | for (i = 0; i < hash->size; i++) { | |
2058 | head = &hash->table[i]; | |
2059 | ||
2060 | rcu_read_lock(); | |
48100bac | 2061 | hlist_for_each_entry_rcu(tt_common_entry, node, |
058d0e26 | 2062 | head, hash_entry) { |
697f2531 AQ |
2063 | if (enable) { |
2064 | if ((tt_common_entry->flags & flags) == flags) | |
2065 | continue; | |
2066 | tt_common_entry->flags |= flags; | |
2067 | } else { | |
2068 | if (!(tt_common_entry->flags & flags)) | |
2069 | continue; | |
2070 | tt_common_entry->flags &= ~flags; | |
2071 | } | |
2072 | changed_num++; | |
058d0e26 AQ |
2073 | } |
2074 | rcu_read_unlock(); | |
2075 | } | |
697f2531 AQ |
2076 | out: |
2077 | return changed_num; | |
058d0e26 AQ |
2078 | } |
2079 | ||
2080 | /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */ | |
a513088d | 2081 | static void batadv_tt_local_purge_pending_clients(struct bat_priv *bat_priv) |
058d0e26 AQ |
2082 | { |
2083 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
48100bac | 2084 | struct tt_common_entry *tt_common_entry; |
058d0e26 AQ |
2085 | struct tt_local_entry *tt_local_entry; |
2086 | struct hlist_node *node, *node_tmp; | |
2087 | struct hlist_head *head; | |
2088 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
c90681b8 | 2089 | uint32_t i; |
058d0e26 AQ |
2090 | |
2091 | if (!hash) | |
2092 | return; | |
2093 | ||
2094 | for (i = 0; i < hash->size; i++) { | |
2095 | head = &hash->table[i]; | |
2096 | list_lock = &hash->list_locks[i]; | |
2097 | ||
2098 | spin_lock_bh(list_lock); | |
48100bac | 2099 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
058d0e26 | 2100 | head, hash_entry) { |
48100bac | 2101 | if (!(tt_common_entry->flags & TT_CLIENT_PENDING)) |
058d0e26 AQ |
2102 | continue; |
2103 | ||
1eda58bf SE |
2104 | batadv_dbg(DBG_TT, bat_priv, |
2105 | "Deleting local tt entry (%pM): pending\n", | |
2106 | tt_common_entry->addr); | |
058d0e26 AQ |
2107 | |
2108 | atomic_dec(&bat_priv->num_local_tt); | |
2109 | hlist_del_rcu(node); | |
48100bac AQ |
2110 | tt_local_entry = container_of(tt_common_entry, |
2111 | struct tt_local_entry, | |
2112 | common); | |
a513088d | 2113 | batadv_tt_local_entry_free_ref(tt_local_entry); |
058d0e26 AQ |
2114 | } |
2115 | spin_unlock_bh(list_lock); | |
2116 | } | |
2117 | ||
2118 | } | |
2119 | ||
a513088d SE |
2120 | static int batadv_tt_commit_changes(struct bat_priv *bat_priv, |
2121 | unsigned char **packet_buff, | |
2122 | int *packet_buff_len, int packet_min_len) | |
058d0e26 | 2123 | { |
be9aa4c1 ML |
2124 | uint16_t changed_num = 0; |
2125 | ||
2126 | if (atomic_read(&bat_priv->tt_local_changes) < 1) | |
2127 | return -ENOENT; | |
2128 | ||
a513088d SE |
2129 | changed_num = batadv_tt_set_flags(bat_priv->tt_local_hash, |
2130 | TT_CLIENT_NEW, false); | |
be9aa4c1 ML |
2131 | |
2132 | /* all reset entries have to be counted as local entries */ | |
697f2531 | 2133 | atomic_add(changed_num, &bat_priv->num_local_tt); |
a513088d | 2134 | batadv_tt_local_purge_pending_clients(bat_priv); |
be9aa4c1 | 2135 | bat_priv->tt_crc = batadv_tt_local_crc(bat_priv); |
058d0e26 AQ |
2136 | |
2137 | /* Increment the TTVN only once per OGM interval */ | |
2138 | atomic_inc(&bat_priv->ttvn); | |
1eda58bf SE |
2139 | batadv_dbg(DBG_TT, bat_priv, |
2140 | "Local changes committed, updating to ttvn %u\n", | |
2141 | (uint8_t)atomic_read(&bat_priv->ttvn)); | |
058d0e26 | 2142 | bat_priv->tt_poss_change = false; |
be9aa4c1 ML |
2143 | |
2144 | /* reset the sending counter */ | |
2145 | atomic_set(&bat_priv->tt_ogm_append_cnt, TT_OGM_APPEND_MAX); | |
2146 | ||
a513088d SE |
2147 | return batadv_tt_changes_fill_buff(bat_priv, packet_buff, |
2148 | packet_buff_len, packet_min_len); | |
be9aa4c1 ML |
2149 | } |
2150 | ||
2151 | /* when calling this function (hard_iface == primary_if) has to be true */ | |
2152 | int batadv_tt_append_diff(struct bat_priv *bat_priv, | |
2153 | unsigned char **packet_buff, int *packet_buff_len, | |
2154 | int packet_min_len) | |
2155 | { | |
2156 | int tt_num_changes; | |
2157 | ||
2158 | /* if at least one change happened */ | |
a513088d SE |
2159 | tt_num_changes = batadv_tt_commit_changes(bat_priv, packet_buff, |
2160 | packet_buff_len, | |
2161 | packet_min_len); | |
be9aa4c1 ML |
2162 | |
2163 | /* if the changes have been sent often enough */ | |
2164 | if ((tt_num_changes < 0) && | |
2165 | (!atomic_dec_not_zero(&bat_priv->tt_ogm_append_cnt))) { | |
a513088d SE |
2166 | batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, |
2167 | packet_min_len, packet_min_len); | |
be9aa4c1 ML |
2168 | tt_num_changes = 0; |
2169 | } | |
2170 | ||
2171 | return tt_num_changes; | |
058d0e26 | 2172 | } |
59b699cd | 2173 | |
08c36d3e SE |
2174 | bool batadv_is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, |
2175 | uint8_t *dst) | |
59b699cd AQ |
2176 | { |
2177 | struct tt_local_entry *tt_local_entry = NULL; | |
2178 | struct tt_global_entry *tt_global_entry = NULL; | |
5870adc6 | 2179 | bool ret = false; |
59b699cd AQ |
2180 | |
2181 | if (!atomic_read(&bat_priv->ap_isolation)) | |
5870adc6 | 2182 | goto out; |
59b699cd | 2183 | |
a513088d | 2184 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst); |
59b699cd AQ |
2185 | if (!tt_local_entry) |
2186 | goto out; | |
2187 | ||
a513088d | 2188 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, src); |
59b699cd AQ |
2189 | if (!tt_global_entry) |
2190 | goto out; | |
2191 | ||
1f129fef | 2192 | if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) |
59b699cd AQ |
2193 | goto out; |
2194 | ||
5870adc6 | 2195 | ret = true; |
59b699cd AQ |
2196 | |
2197 | out: | |
2198 | if (tt_global_entry) | |
a513088d | 2199 | batadv_tt_global_entry_free_ref(tt_global_entry); |
59b699cd | 2200 | if (tt_local_entry) |
a513088d | 2201 | batadv_tt_local_entry_free_ref(tt_local_entry); |
59b699cd AQ |
2202 | return ret; |
2203 | } | |
a943cac1 | 2204 | |
08c36d3e SE |
2205 | void batadv_tt_update_orig(struct bat_priv *bat_priv, |
2206 | struct orig_node *orig_node, | |
2207 | const unsigned char *tt_buff, uint8_t tt_num_changes, | |
2208 | uint8_t ttvn, uint16_t tt_crc) | |
a943cac1 ML |
2209 | { |
2210 | uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
2211 | bool full_table = true; | |
2212 | ||
20ff9d59 | 2213 | /* don't care about a backbone gateways updates. */ |
08adf151 | 2214 | if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) |
20ff9d59 SW |
2215 | return; |
2216 | ||
17071578 | 2217 | /* orig table not initialised AND first diff is in the OGM OR the ttvn |
9cfc7bd6 SE |
2218 | * increased by one -> we can apply the attached changes |
2219 | */ | |
17071578 AQ |
2220 | if ((!orig_node->tt_initialised && ttvn == 1) || |
2221 | ttvn - orig_ttvn == 1) { | |
a943cac1 ML |
2222 | /* the OGM could not contain the changes due to their size or |
2223 | * because they have already been sent TT_OGM_APPEND_MAX times. | |
9cfc7bd6 SE |
2224 | * In this case send a tt request |
2225 | */ | |
a943cac1 ML |
2226 | if (!tt_num_changes) { |
2227 | full_table = false; | |
2228 | goto request_table; | |
2229 | } | |
2230 | ||
a513088d SE |
2231 | batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes, |
2232 | ttvn, (struct tt_change *)tt_buff); | |
a943cac1 ML |
2233 | |
2234 | /* Even if we received the precomputed crc with the OGM, we | |
2235 | * prefer to recompute it to spot any possible inconsistency | |
9cfc7bd6 SE |
2236 | * in the global table |
2237 | */ | |
a513088d | 2238 | orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); |
a943cac1 ML |
2239 | |
2240 | /* The ttvn alone is not enough to guarantee consistency | |
2241 | * because a single value could represent different states | |
2242 | * (due to the wrap around). Thus a node has to check whether | |
2243 | * the resulting table (after applying the changes) is still | |
2244 | * consistent or not. E.g. a node could disconnect while its | |
2245 | * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case | |
2246 | * checking the CRC value is mandatory to detect the | |
9cfc7bd6 SE |
2247 | * inconsistency |
2248 | */ | |
a943cac1 ML |
2249 | if (orig_node->tt_crc != tt_crc) |
2250 | goto request_table; | |
2251 | ||
2252 | /* Roaming phase is over: tables are in sync again. I can | |
9cfc7bd6 SE |
2253 | * unset the flag |
2254 | */ | |
a943cac1 ML |
2255 | orig_node->tt_poss_change = false; |
2256 | } else { | |
2257 | /* if we missed more than one change or our tables are not | |
9cfc7bd6 SE |
2258 | * in sync anymore -> request fresh tt data |
2259 | */ | |
17071578 AQ |
2260 | if (!orig_node->tt_initialised || ttvn != orig_ttvn || |
2261 | orig_node->tt_crc != tt_crc) { | |
a943cac1 | 2262 | request_table: |
1eda58bf SE |
2263 | batadv_dbg(DBG_TT, bat_priv, |
2264 | "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n", | |
2265 | orig_node->orig, ttvn, orig_ttvn, tt_crc, | |
2266 | orig_node->tt_crc, tt_num_changes); | |
a513088d SE |
2267 | batadv_send_tt_request(bat_priv, orig_node, ttvn, |
2268 | tt_crc, full_table); | |
a943cac1 ML |
2269 | return; |
2270 | } | |
2271 | } | |
2272 | } | |
3275e7cc AQ |
2273 | |
2274 | /* returns true whether we know that the client has moved from its old | |
2275 | * originator to another one. This entry is kept is still kept for consistency | |
2276 | * purposes | |
2277 | */ | |
08c36d3e SE |
2278 | bool batadv_tt_global_client_is_roaming(struct bat_priv *bat_priv, |
2279 | uint8_t *addr) | |
3275e7cc AQ |
2280 | { |
2281 | struct tt_global_entry *tt_global_entry; | |
2282 | bool ret = false; | |
2283 | ||
a513088d | 2284 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
3275e7cc AQ |
2285 | if (!tt_global_entry) |
2286 | goto out; | |
2287 | ||
2288 | ret = tt_global_entry->common.flags & TT_CLIENT_ROAM; | |
a513088d | 2289 | batadv_tt_global_entry_free_ref(tt_global_entry); |
3275e7cc AQ |
2290 | out: |
2291 | return ret; | |
2292 | } |