Commit | Line | Data |
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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 | 159 | { |
3b643de5 AQ |
160 | struct tt_change_node *tt_change_node, *entry, *safe; |
161 | bool event_removed = false; | |
162 | bool del_op_requested, del_op_entry; | |
a73105b8 AQ |
163 | |
164 | tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC); | |
165 | ||
166 | if (!tt_change_node) | |
167 | return; | |
168 | ||
ff66c975 | 169 | tt_change_node->change.flags = flags; |
a73105b8 AQ |
170 | memcpy(tt_change_node->change.addr, addr, ETH_ALEN); |
171 | ||
acd34afa | 172 | del_op_requested = flags & BATADV_TT_CLIENT_DEL; |
3b643de5 AQ |
173 | |
174 | /* check for ADD+DEL or DEL+ADD events */ | |
a73105b8 | 175 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
3b643de5 AQ |
176 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
177 | list) { | |
178 | if (!batadv_compare_eth(entry->change.addr, addr)) | |
179 | continue; | |
180 | ||
181 | /* DEL+ADD in the same orig interval have no effect and can be | |
182 | * removed to avoid silly behaviour on the receiver side. The | |
183 | * other way around (ADD+DEL) can happen in case of roaming of | |
184 | * a client still in the NEW state. Roaming of NEW clients is | |
185 | * now possible due to automatically recognition of "temporary" | |
186 | * clients | |
187 | */ | |
acd34afa | 188 | del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL; |
3b643de5 AQ |
189 | if (!del_op_requested && del_op_entry) |
190 | goto del; | |
191 | if (del_op_requested && !del_op_entry) | |
192 | goto del; | |
193 | continue; | |
194 | del: | |
195 | list_del(&entry->list); | |
196 | kfree(entry); | |
197 | event_removed = true; | |
198 | goto unlock; | |
199 | } | |
200 | ||
a73105b8 AQ |
201 | /* track the change in the OGMinterval list */ |
202 | list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list); | |
3b643de5 AQ |
203 | |
204 | unlock: | |
a73105b8 AQ |
205 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); |
206 | ||
3b643de5 AQ |
207 | if (event_removed) |
208 | atomic_dec(&bat_priv->tt_local_changes); | |
209 | else | |
210 | atomic_inc(&bat_priv->tt_local_changes); | |
a73105b8 AQ |
211 | } |
212 | ||
08c36d3e | 213 | int batadv_tt_len(int changes_num) |
a73105b8 AQ |
214 | { |
215 | return changes_num * sizeof(struct tt_change); | |
216 | } | |
217 | ||
a513088d | 218 | static int batadv_tt_local_init(struct bat_priv *bat_priv) |
c6c8fea2 | 219 | { |
2dafb49d | 220 | if (bat_priv->tt_local_hash) |
5346c35e | 221 | return 0; |
c6c8fea2 | 222 | |
1a8eaf07 | 223 | bat_priv->tt_local_hash = batadv_hash_new(1024); |
c6c8fea2 | 224 | |
2dafb49d | 225 | if (!bat_priv->tt_local_hash) |
5346c35e | 226 | return -ENOMEM; |
c6c8fea2 | 227 | |
5346c35e | 228 | return 0; |
c6c8fea2 SE |
229 | } |
230 | ||
08c36d3e SE |
231 | void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, |
232 | int ifindex) | |
c6c8fea2 SE |
233 | { |
234 | struct bat_priv *bat_priv = netdev_priv(soft_iface); | |
7683fdc1 AQ |
235 | struct tt_local_entry *tt_local_entry = NULL; |
236 | struct tt_global_entry *tt_global_entry = NULL; | |
db08e6e5 SW |
237 | struct hlist_head *head; |
238 | struct hlist_node *node; | |
239 | struct tt_orig_list_entry *orig_entry; | |
80b3f58c | 240 | int hash_added; |
c6c8fea2 | 241 | |
a513088d | 242 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
c6c8fea2 | 243 | |
2dafb49d AQ |
244 | if (tt_local_entry) { |
245 | tt_local_entry->last_seen = jiffies; | |
acd34afa SE |
246 | /* possibly unset the BATADV_TT_CLIENT_PENDING flag */ |
247 | tt_local_entry->common.flags &= ~BATADV_TT_CLIENT_PENDING; | |
7683fdc1 | 248 | goto out; |
c6c8fea2 SE |
249 | } |
250 | ||
704509b8 | 251 | tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC); |
2dafb49d | 252 | if (!tt_local_entry) |
7683fdc1 | 253 | goto out; |
a73105b8 | 254 | |
1eda58bf SE |
255 | batadv_dbg(DBG_TT, bat_priv, |
256 | "Creating new local tt entry: %pM (ttvn: %d)\n", addr, | |
257 | (uint8_t)atomic_read(&bat_priv->ttvn)); | |
c6c8fea2 | 258 | |
48100bac | 259 | memcpy(tt_local_entry->common.addr, addr, ETH_ALEN); |
42d0b044 | 260 | tt_local_entry->common.flags = BATADV_NO_FLAGS; |
9563877e | 261 | if (batadv_is_wifi_iface(ifindex)) |
acd34afa | 262 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_WIFI; |
48100bac AQ |
263 | atomic_set(&tt_local_entry->common.refcount, 2); |
264 | tt_local_entry->last_seen = jiffies; | |
c6c8fea2 SE |
265 | |
266 | /* the batman interface mac address should never be purged */ | |
1eda58bf | 267 | if (batadv_compare_eth(addr, soft_iface->dev_addr)) |
acd34afa | 268 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_NOPURGE; |
c6c8fea2 | 269 | |
c40ed2bf AQ |
270 | /* The local entry has to be marked as NEW to avoid to send it in |
271 | * a full table response going out before the next ttvn increment | |
9cfc7bd6 SE |
272 | * (consistency check) |
273 | */ | |
acd34afa | 274 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_NEW; |
c40ed2bf | 275 | |
a513088d | 276 | hash_added = batadv_hash_add(bat_priv->tt_local_hash, batadv_compare_tt, |
da641193 SE |
277 | batadv_choose_orig, |
278 | &tt_local_entry->common, | |
c0a55929 | 279 | &tt_local_entry->common.hash_entry); |
80b3f58c SW |
280 | |
281 | if (unlikely(hash_added != 0)) { | |
282 | /* remove the reference for the hash */ | |
a513088d | 283 | batadv_tt_local_entry_free_ref(tt_local_entry); |
80b3f58c SW |
284 | goto out; |
285 | } | |
286 | ||
a513088d | 287 | batadv_tt_local_event(bat_priv, addr, tt_local_entry->common.flags); |
ff66c975 | 288 | |
c6c8fea2 | 289 | /* remove address from global hash if present */ |
a513088d | 290 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
c6c8fea2 | 291 | |
cc47f66e AQ |
292 | /* Check whether it is a roaming! */ |
293 | if (tt_global_entry) { | |
db08e6e5 SW |
294 | /* These node are probably going to update their tt table */ |
295 | head = &tt_global_entry->orig_list; | |
296 | rcu_read_lock(); | |
297 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
298 | orig_entry->orig_node->tt_poss_change = true; | |
299 | ||
a513088d SE |
300 | batadv_send_roam_adv(bat_priv, |
301 | tt_global_entry->common.addr, | |
302 | orig_entry->orig_node); | |
db08e6e5 SW |
303 | } |
304 | rcu_read_unlock(); | |
305 | /* The global entry has to be marked as ROAMING and | |
306 | * has to be kept for consistency purpose | |
307 | */ | |
acd34afa | 308 | tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; |
03fc3070 | 309 | tt_global_entry->roam_at = jiffies; |
7683fdc1 AQ |
310 | } |
311 | out: | |
312 | if (tt_local_entry) | |
a513088d | 313 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7683fdc1 | 314 | if (tt_global_entry) |
a513088d | 315 | batadv_tt_global_entry_free_ref(tt_global_entry); |
c6c8fea2 SE |
316 | } |
317 | ||
a513088d SE |
318 | static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff, |
319 | int *packet_buff_len, | |
320 | int min_packet_len, | |
321 | int new_packet_len) | |
be9aa4c1 ML |
322 | { |
323 | unsigned char *new_buff; | |
324 | ||
325 | new_buff = kmalloc(new_packet_len, GFP_ATOMIC); | |
326 | ||
327 | /* keep old buffer if kmalloc should fail */ | |
328 | if (new_buff) { | |
329 | memcpy(new_buff, *packet_buff, min_packet_len); | |
330 | kfree(*packet_buff); | |
331 | *packet_buff = new_buff; | |
332 | *packet_buff_len = new_packet_len; | |
333 | } | |
334 | } | |
335 | ||
a513088d SE |
336 | static void batadv_tt_prepare_packet_buff(struct bat_priv *bat_priv, |
337 | unsigned char **packet_buff, | |
338 | int *packet_buff_len, | |
339 | int min_packet_len) | |
be9aa4c1 ML |
340 | { |
341 | struct hard_iface *primary_if; | |
342 | int req_len; | |
343 | ||
e5d89254 | 344 | primary_if = batadv_primary_if_get_selected(bat_priv); |
be9aa4c1 ML |
345 | |
346 | req_len = min_packet_len; | |
08c36d3e | 347 | req_len += batadv_tt_len(atomic_read(&bat_priv->tt_local_changes)); |
be9aa4c1 ML |
348 | |
349 | /* if we have too many changes for one packet don't send any | |
350 | * and wait for the tt table request which will be fragmented | |
351 | */ | |
352 | if ((!primary_if) || (req_len > primary_if->soft_iface->mtu)) | |
353 | req_len = min_packet_len; | |
354 | ||
a513088d SE |
355 | batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, |
356 | min_packet_len, req_len); | |
be9aa4c1 ML |
357 | |
358 | if (primary_if) | |
e5d89254 | 359 | batadv_hardif_free_ref(primary_if); |
be9aa4c1 ML |
360 | } |
361 | ||
a513088d SE |
362 | static int batadv_tt_changes_fill_buff(struct bat_priv *bat_priv, |
363 | unsigned char **packet_buff, | |
364 | int *packet_buff_len, | |
365 | int min_packet_len) | |
c6c8fea2 | 366 | { |
a73105b8 | 367 | struct tt_change_node *entry, *safe; |
be9aa4c1 ML |
368 | int count = 0, tot_changes = 0, new_len; |
369 | unsigned char *tt_buff; | |
370 | ||
a513088d SE |
371 | batadv_tt_prepare_packet_buff(bat_priv, packet_buff, |
372 | packet_buff_len, min_packet_len); | |
c6c8fea2 | 373 | |
be9aa4c1 ML |
374 | new_len = *packet_buff_len - min_packet_len; |
375 | tt_buff = *packet_buff + min_packet_len; | |
376 | ||
377 | if (new_len > 0) | |
08c36d3e | 378 | tot_changes = new_len / batadv_tt_len(1); |
c6c8fea2 | 379 | |
a73105b8 AQ |
380 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
381 | atomic_set(&bat_priv->tt_local_changes, 0); | |
c6c8fea2 | 382 | |
a73105b8 | 383 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
7c64fd98 | 384 | list) { |
a73105b8 | 385 | if (count < tot_changes) { |
08c36d3e | 386 | memcpy(tt_buff + batadv_tt_len(count), |
a73105b8 | 387 | &entry->change, sizeof(struct tt_change)); |
c6c8fea2 SE |
388 | count++; |
389 | } | |
a73105b8 AQ |
390 | list_del(&entry->list); |
391 | kfree(entry); | |
c6c8fea2 | 392 | } |
a73105b8 AQ |
393 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); |
394 | ||
395 | /* Keep the buffer for possible tt_request */ | |
396 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
397 | kfree(bat_priv->tt_buff); | |
398 | bat_priv->tt_buff_len = 0; | |
399 | bat_priv->tt_buff = NULL; | |
be9aa4c1 ML |
400 | /* check whether this new OGM has no changes due to size problems */ |
401 | if (new_len > 0) { | |
402 | /* if kmalloc() fails we will reply with the full table | |
a73105b8 AQ |
403 | * instead of providing the diff |
404 | */ | |
be9aa4c1 | 405 | bat_priv->tt_buff = kmalloc(new_len, GFP_ATOMIC); |
a73105b8 | 406 | if (bat_priv->tt_buff) { |
be9aa4c1 ML |
407 | memcpy(bat_priv->tt_buff, tt_buff, new_len); |
408 | bat_priv->tt_buff_len = new_len; | |
a73105b8 AQ |
409 | } |
410 | } | |
411 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
c6c8fea2 | 412 | |
08ad76ec | 413 | return count; |
c6c8fea2 SE |
414 | } |
415 | ||
08c36d3e | 416 | int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
417 | { |
418 | struct net_device *net_dev = (struct net_device *)seq->private; | |
419 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
2dafb49d | 420 | struct hashtable_t *hash = bat_priv->tt_local_hash; |
48100bac | 421 | struct tt_common_entry *tt_common_entry; |
32ae9b22 | 422 | struct hard_iface *primary_if; |
7aadf889 | 423 | struct hlist_node *node; |
c6c8fea2 | 424 | struct hlist_head *head; |
c90681b8 AQ |
425 | uint32_t i; |
426 | int ret = 0; | |
32ae9b22 | 427 | |
e5d89254 | 428 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 429 | if (!primary_if) { |
86ceb360 SE |
430 | ret = seq_printf(seq, |
431 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
432 | net_dev->name); |
433 | goto out; | |
434 | } | |
c6c8fea2 | 435 | |
e9a4f295 | 436 | if (primary_if->if_status != BATADV_IF_ACTIVE) { |
86ceb360 SE |
437 | ret = seq_printf(seq, |
438 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
439 | net_dev->name); |
440 | goto out; | |
c6c8fea2 SE |
441 | } |
442 | ||
86ceb360 SE |
443 | seq_printf(seq, |
444 | "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n", | |
a73105b8 | 445 | net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn)); |
c6c8fea2 | 446 | |
c6c8fea2 SE |
447 | for (i = 0; i < hash->size; i++) { |
448 | head = &hash->table[i]; | |
449 | ||
7aadf889 | 450 | rcu_read_lock(); |
48100bac | 451 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 452 | head, hash_entry) { |
d099c2c5 | 453 | seq_printf(seq, " * %pM [%c%c%c%c%c]\n", |
7c64fd98 SE |
454 | tt_common_entry->addr, |
455 | (tt_common_entry->flags & | |
acd34afa | 456 | BATADV_TT_CLIENT_ROAM ? 'R' : '.'), |
7c64fd98 | 457 | (tt_common_entry->flags & |
acd34afa | 458 | BATADV_TT_CLIENT_NOPURGE ? 'P' : '.'), |
7c64fd98 | 459 | (tt_common_entry->flags & |
acd34afa | 460 | BATADV_TT_CLIENT_NEW ? 'N' : '.'), |
7c64fd98 | 461 | (tt_common_entry->flags & |
acd34afa | 462 | BATADV_TT_CLIENT_PENDING ? 'X' : '.'), |
7c64fd98 | 463 | (tt_common_entry->flags & |
acd34afa | 464 | BATADV_TT_CLIENT_WIFI ? 'W' : '.')); |
c6c8fea2 | 465 | } |
7aadf889 | 466 | rcu_read_unlock(); |
c6c8fea2 | 467 | } |
32ae9b22 ML |
468 | out: |
469 | if (primary_if) | |
e5d89254 | 470 | batadv_hardif_free_ref(primary_if); |
32ae9b22 | 471 | return ret; |
c6c8fea2 SE |
472 | } |
473 | ||
a513088d SE |
474 | static void batadv_tt_local_set_pending(struct bat_priv *bat_priv, |
475 | struct tt_local_entry *tt_local_entry, | |
476 | uint16_t flags, const char *message) | |
c6c8fea2 | 477 | { |
a513088d SE |
478 | batadv_tt_local_event(bat_priv, tt_local_entry->common.addr, |
479 | tt_local_entry->common.flags | flags); | |
a73105b8 | 480 | |
015758d0 AQ |
481 | /* The local client has to be marked as "pending to be removed" but has |
482 | * to be kept in the table in order to send it in a full table | |
9cfc7bd6 SE |
483 | * response issued before the net ttvn increment (consistency check) |
484 | */ | |
acd34afa | 485 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING; |
c566dbbe | 486 | |
1eda58bf SE |
487 | batadv_dbg(DBG_TT, bat_priv, |
488 | "Local tt entry (%pM) pending to be removed: %s\n", | |
489 | tt_local_entry->common.addr, message); | |
c6c8fea2 SE |
490 | } |
491 | ||
08c36d3e SE |
492 | void batadv_tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr, |
493 | const char *message, bool roaming) | |
c6c8fea2 | 494 | { |
7683fdc1 | 495 | struct tt_local_entry *tt_local_entry = NULL; |
42d0b044 | 496 | uint16_t flags; |
c6c8fea2 | 497 | |
a513088d | 498 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
499 | if (!tt_local_entry) |
500 | goto out; | |
501 | ||
acd34afa | 502 | flags = BATADV_TT_CLIENT_DEL; |
42d0b044 | 503 | if (roaming) |
acd34afa | 504 | flags |= BATADV_TT_CLIENT_ROAM; |
42d0b044 SE |
505 | |
506 | batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags, message); | |
7683fdc1 AQ |
507 | out: |
508 | if (tt_local_entry) | |
a513088d | 509 | batadv_tt_local_entry_free_ref(tt_local_entry); |
c6c8fea2 SE |
510 | } |
511 | ||
acd34afa SE |
512 | static void batadv_tt_local_purge_list(struct bat_priv *bat_priv, |
513 | struct hlist_head *head) | |
c6c8fea2 | 514 | { |
2dafb49d | 515 | struct tt_local_entry *tt_local_entry; |
48100bac | 516 | struct tt_common_entry *tt_common_entry; |
7aadf889 | 517 | struct hlist_node *node, *node_tmp; |
acd34afa SE |
518 | |
519 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, head, | |
520 | hash_entry) { | |
521 | tt_local_entry = container_of(tt_common_entry, | |
522 | struct tt_local_entry, common); | |
523 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE) | |
524 | continue; | |
525 | ||
526 | /* entry already marked for deletion */ | |
527 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) | |
528 | continue; | |
529 | ||
530 | if (!batadv_has_timed_out(tt_local_entry->last_seen, | |
531 | BATADV_TT_LOCAL_TIMEOUT)) | |
532 | continue; | |
533 | ||
534 | batadv_tt_local_set_pending(bat_priv, tt_local_entry, | |
535 | BATADV_TT_CLIENT_DEL, "timed out"); | |
536 | } | |
537 | } | |
538 | ||
539 | static void batadv_tt_local_purge(struct bat_priv *bat_priv) | |
540 | { | |
541 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
c6c8fea2 | 542 | struct hlist_head *head; |
7683fdc1 | 543 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 544 | uint32_t i; |
c6c8fea2 | 545 | |
c6c8fea2 SE |
546 | for (i = 0; i < hash->size; i++) { |
547 | head = &hash->table[i]; | |
7683fdc1 | 548 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 549 | |
7683fdc1 | 550 | spin_lock_bh(list_lock); |
acd34afa | 551 | batadv_tt_local_purge_list(bat_priv, head); |
7683fdc1 | 552 | spin_unlock_bh(list_lock); |
c6c8fea2 SE |
553 | } |
554 | ||
c6c8fea2 SE |
555 | } |
556 | ||
a513088d | 557 | static void batadv_tt_local_table_free(struct bat_priv *bat_priv) |
c6c8fea2 | 558 | { |
a73105b8 | 559 | struct hashtable_t *hash; |
a73105b8 | 560 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
48100bac | 561 | struct tt_common_entry *tt_common_entry; |
a73105b8 | 562 | struct tt_local_entry *tt_local_entry; |
7683fdc1 AQ |
563 | struct hlist_node *node, *node_tmp; |
564 | struct hlist_head *head; | |
c90681b8 | 565 | uint32_t i; |
a73105b8 | 566 | |
2dafb49d | 567 | if (!bat_priv->tt_local_hash) |
c6c8fea2 SE |
568 | return; |
569 | ||
a73105b8 AQ |
570 | hash = bat_priv->tt_local_hash; |
571 | ||
572 | for (i = 0; i < hash->size; i++) { | |
573 | head = &hash->table[i]; | |
574 | list_lock = &hash->list_locks[i]; | |
575 | ||
576 | spin_lock_bh(list_lock); | |
48100bac | 577 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
a73105b8 AQ |
578 | head, hash_entry) { |
579 | hlist_del_rcu(node); | |
48100bac AQ |
580 | tt_local_entry = container_of(tt_common_entry, |
581 | struct tt_local_entry, | |
582 | common); | |
a513088d | 583 | batadv_tt_local_entry_free_ref(tt_local_entry); |
a73105b8 AQ |
584 | } |
585 | spin_unlock_bh(list_lock); | |
586 | } | |
587 | ||
1a8eaf07 | 588 | batadv_hash_destroy(hash); |
a73105b8 | 589 | |
2dafb49d | 590 | bat_priv->tt_local_hash = NULL; |
c6c8fea2 SE |
591 | } |
592 | ||
a513088d | 593 | static int batadv_tt_global_init(struct bat_priv *bat_priv) |
c6c8fea2 | 594 | { |
2dafb49d | 595 | if (bat_priv->tt_global_hash) |
5346c35e | 596 | return 0; |
c6c8fea2 | 597 | |
1a8eaf07 | 598 | bat_priv->tt_global_hash = batadv_hash_new(1024); |
c6c8fea2 | 599 | |
2dafb49d | 600 | if (!bat_priv->tt_global_hash) |
5346c35e | 601 | return -ENOMEM; |
c6c8fea2 | 602 | |
5346c35e | 603 | return 0; |
c6c8fea2 SE |
604 | } |
605 | ||
a513088d | 606 | static void batadv_tt_changes_list_free(struct bat_priv *bat_priv) |
c6c8fea2 | 607 | { |
a73105b8 | 608 | struct tt_change_node *entry, *safe; |
c6c8fea2 | 609 | |
a73105b8 | 610 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
c6c8fea2 | 611 | |
a73105b8 AQ |
612 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
613 | list) { | |
614 | list_del(&entry->list); | |
615 | kfree(entry); | |
616 | } | |
c6c8fea2 | 617 | |
a73105b8 AQ |
618 | atomic_set(&bat_priv->tt_local_changes, 0); |
619 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); | |
620 | } | |
c6c8fea2 | 621 | |
db08e6e5 SW |
622 | /* find out if an orig_node is already in the list of a tt_global_entry. |
623 | * returns 1 if found, 0 otherwise | |
624 | */ | |
a513088d SE |
625 | static bool batadv_tt_global_entry_has_orig(const struct tt_global_entry *entry, |
626 | const struct orig_node *orig_node) | |
db08e6e5 SW |
627 | { |
628 | struct tt_orig_list_entry *tmp_orig_entry; | |
629 | const struct hlist_head *head; | |
630 | struct hlist_node *node; | |
631 | bool found = false; | |
632 | ||
633 | rcu_read_lock(); | |
634 | head = &entry->orig_list; | |
635 | hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) { | |
636 | if (tmp_orig_entry->orig_node == orig_node) { | |
637 | found = true; | |
638 | break; | |
639 | } | |
640 | } | |
641 | rcu_read_unlock(); | |
642 | return found; | |
643 | } | |
644 | ||
a513088d SE |
645 | static void |
646 | batadv_tt_global_add_orig_entry(struct tt_global_entry *tt_global_entry, | |
647 | struct orig_node *orig_node, int ttvn) | |
db08e6e5 SW |
648 | { |
649 | struct tt_orig_list_entry *orig_entry; | |
650 | ||
651 | orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC); | |
652 | if (!orig_entry) | |
653 | return; | |
654 | ||
655 | INIT_HLIST_NODE(&orig_entry->list); | |
656 | atomic_inc(&orig_node->refcount); | |
657 | atomic_inc(&orig_node->tt_size); | |
658 | orig_entry->orig_node = orig_node; | |
659 | orig_entry->ttvn = ttvn; | |
660 | ||
661 | spin_lock_bh(&tt_global_entry->list_lock); | |
662 | hlist_add_head_rcu(&orig_entry->list, | |
663 | &tt_global_entry->orig_list); | |
664 | spin_unlock_bh(&tt_global_entry->list_lock); | |
665 | } | |
666 | ||
a73105b8 | 667 | /* caller must hold orig_node refcount */ |
08c36d3e | 668 | int batadv_tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node, |
d4f44692 AQ |
669 | const unsigned char *tt_addr, uint8_t flags, |
670 | uint8_t ttvn) | |
a73105b8 | 671 | { |
db08e6e5 | 672 | struct tt_global_entry *tt_global_entry = NULL; |
7683fdc1 | 673 | int ret = 0; |
80b3f58c | 674 | int hash_added; |
c0a55929 | 675 | struct tt_common_entry *common; |
c6c8fea2 | 676 | |
a513088d | 677 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr); |
a73105b8 AQ |
678 | |
679 | if (!tt_global_entry) { | |
d4f44692 | 680 | tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC); |
a73105b8 | 681 | if (!tt_global_entry) |
7683fdc1 AQ |
682 | goto out; |
683 | ||
c0a55929 SE |
684 | common = &tt_global_entry->common; |
685 | memcpy(common->addr, tt_addr, ETH_ALEN); | |
db08e6e5 | 686 | |
d4f44692 | 687 | common->flags = flags; |
cc47f66e | 688 | tt_global_entry->roam_at = 0; |
c0a55929 | 689 | atomic_set(&common->refcount, 2); |
db08e6e5 SW |
690 | |
691 | INIT_HLIST_HEAD(&tt_global_entry->orig_list); | |
692 | spin_lock_init(&tt_global_entry->list_lock); | |
7683fdc1 | 693 | |
c0a55929 | 694 | hash_added = batadv_hash_add(bat_priv->tt_global_hash, |
a513088d SE |
695 | batadv_compare_tt, |
696 | batadv_choose_orig, common, | |
697 | &common->hash_entry); | |
80b3f58c SW |
698 | |
699 | if (unlikely(hash_added != 0)) { | |
700 | /* remove the reference for the hash */ | |
a513088d | 701 | batadv_tt_global_entry_free_ref(tt_global_entry); |
80b3f58c SW |
702 | goto out_remove; |
703 | } | |
db08e6e5 | 704 | |
a513088d SE |
705 | batadv_tt_global_add_orig_entry(tt_global_entry, orig_node, |
706 | ttvn); | |
a73105b8 | 707 | } else { |
db08e6e5 SW |
708 | /* there is already a global entry, use this one. */ |
709 | ||
acd34afa SE |
710 | /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only |
711 | * one originator left in the list and we previously received a | |
db08e6e5 SW |
712 | * delete + roaming change for this originator. |
713 | * | |
714 | * We should first delete the old originator before adding the | |
715 | * new one. | |
716 | */ | |
acd34afa | 717 | if (tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM) { |
a513088d | 718 | batadv_tt_global_del_orig_list(tt_global_entry); |
acd34afa | 719 | tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM; |
db08e6e5 | 720 | tt_global_entry->roam_at = 0; |
a73105b8 | 721 | } |
db08e6e5 | 722 | |
a513088d SE |
723 | if (!batadv_tt_global_entry_has_orig(tt_global_entry, |
724 | orig_node)) | |
725 | batadv_tt_global_add_orig_entry(tt_global_entry, | |
726 | orig_node, ttvn); | |
a73105b8 | 727 | } |
c6c8fea2 | 728 | |
1eda58bf SE |
729 | batadv_dbg(DBG_TT, bat_priv, |
730 | "Creating new global tt entry: %pM (via %pM)\n", | |
731 | tt_global_entry->common.addr, orig_node->orig); | |
c6c8fea2 | 732 | |
80b3f58c | 733 | out_remove: |
a73105b8 | 734 | /* remove address from local hash if present */ |
08c36d3e | 735 | batadv_tt_local_remove(bat_priv, tt_global_entry->common.addr, |
acd34afa SE |
736 | "global tt received", |
737 | flags & BATADV_TT_CLIENT_ROAM); | |
7683fdc1 AQ |
738 | ret = 1; |
739 | out: | |
740 | if (tt_global_entry) | |
a513088d | 741 | batadv_tt_global_entry_free_ref(tt_global_entry); |
7683fdc1 | 742 | return ret; |
c6c8fea2 SE |
743 | } |
744 | ||
db08e6e5 SW |
745 | /* print all orig nodes who announce the address for this global entry. |
746 | * it is assumed that the caller holds rcu_read_lock(); | |
747 | */ | |
a513088d SE |
748 | static void |
749 | batadv_tt_global_print_entry(struct tt_global_entry *tt_global_entry, | |
750 | struct seq_file *seq) | |
db08e6e5 SW |
751 | { |
752 | struct hlist_head *head; | |
753 | struct hlist_node *node; | |
754 | struct tt_orig_list_entry *orig_entry; | |
755 | struct tt_common_entry *tt_common_entry; | |
756 | uint16_t flags; | |
757 | uint8_t last_ttvn; | |
758 | ||
759 | tt_common_entry = &tt_global_entry->common; | |
760 | ||
761 | head = &tt_global_entry->orig_list; | |
762 | ||
763 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
764 | flags = tt_common_entry->flags; | |
765 | last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn); | |
766 | seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c]\n", | |
767 | tt_global_entry->common.addr, orig_entry->ttvn, | |
768 | orig_entry->orig_node->orig, last_ttvn, | |
acd34afa SE |
769 | (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), |
770 | (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.')); | |
db08e6e5 SW |
771 | } |
772 | } | |
773 | ||
08c36d3e | 774 | int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
775 | { |
776 | struct net_device *net_dev = (struct net_device *)seq->private; | |
777 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
2dafb49d | 778 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
48100bac | 779 | struct tt_common_entry *tt_common_entry; |
2dafb49d | 780 | struct tt_global_entry *tt_global_entry; |
32ae9b22 | 781 | struct hard_iface *primary_if; |
7aadf889 | 782 | struct hlist_node *node; |
c6c8fea2 | 783 | struct hlist_head *head; |
c90681b8 AQ |
784 | uint32_t i; |
785 | int ret = 0; | |
32ae9b22 | 786 | |
e5d89254 | 787 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 788 | if (!primary_if) { |
86ceb360 SE |
789 | ret = seq_printf(seq, |
790 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
791 | net_dev->name); |
792 | goto out; | |
793 | } | |
c6c8fea2 | 794 | |
e9a4f295 | 795 | if (primary_if->if_status != BATADV_IF_ACTIVE) { |
86ceb360 SE |
796 | ret = seq_printf(seq, |
797 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
798 | net_dev->name); |
799 | goto out; | |
c6c8fea2 SE |
800 | } |
801 | ||
2dafb49d AQ |
802 | seq_printf(seq, |
803 | "Globally announced TT entries received via the mesh %s\n", | |
c6c8fea2 | 804 | net_dev->name); |
df6edb9e AQ |
805 | seq_printf(seq, " %-13s %s %-15s %s %s\n", |
806 | "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags"); | |
c6c8fea2 | 807 | |
c6c8fea2 SE |
808 | for (i = 0; i < hash->size; i++) { |
809 | head = &hash->table[i]; | |
810 | ||
7aadf889 | 811 | rcu_read_lock(); |
48100bac | 812 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 813 | head, hash_entry) { |
48100bac AQ |
814 | tt_global_entry = container_of(tt_common_entry, |
815 | struct tt_global_entry, | |
816 | common); | |
a513088d | 817 | batadv_tt_global_print_entry(tt_global_entry, seq); |
c6c8fea2 | 818 | } |
7aadf889 | 819 | rcu_read_unlock(); |
c6c8fea2 | 820 | } |
32ae9b22 ML |
821 | out: |
822 | if (primary_if) | |
e5d89254 | 823 | batadv_hardif_free_ref(primary_if); |
32ae9b22 | 824 | return ret; |
c6c8fea2 SE |
825 | } |
826 | ||
db08e6e5 | 827 | /* deletes the orig list of a tt_global_entry */ |
a513088d SE |
828 | static void |
829 | batadv_tt_global_del_orig_list(struct tt_global_entry *tt_global_entry) | |
c6c8fea2 | 830 | { |
db08e6e5 SW |
831 | struct hlist_head *head; |
832 | struct hlist_node *node, *safe; | |
833 | struct tt_orig_list_entry *orig_entry; | |
a73105b8 | 834 | |
db08e6e5 SW |
835 | spin_lock_bh(&tt_global_entry->list_lock); |
836 | head = &tt_global_entry->orig_list; | |
837 | hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { | |
838 | hlist_del_rcu(node); | |
a513088d | 839 | batadv_tt_orig_list_entry_free_ref(orig_entry); |
db08e6e5 SW |
840 | } |
841 | spin_unlock_bh(&tt_global_entry->list_lock); | |
c6c8fea2 | 842 | |
db08e6e5 SW |
843 | } |
844 | ||
a513088d SE |
845 | static void |
846 | batadv_tt_global_del_orig_entry(struct bat_priv *bat_priv, | |
847 | struct tt_global_entry *tt_global_entry, | |
848 | struct orig_node *orig_node, | |
849 | const char *message) | |
db08e6e5 SW |
850 | { |
851 | struct hlist_head *head; | |
852 | struct hlist_node *node, *safe; | |
853 | struct tt_orig_list_entry *orig_entry; | |
854 | ||
855 | spin_lock_bh(&tt_global_entry->list_lock); | |
856 | head = &tt_global_entry->orig_list; | |
857 | hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { | |
858 | if (orig_entry->orig_node == orig_node) { | |
1eda58bf SE |
859 | batadv_dbg(DBG_TT, bat_priv, |
860 | "Deleting %pM from global tt entry %pM: %s\n", | |
861 | orig_node->orig, | |
862 | tt_global_entry->common.addr, message); | |
db08e6e5 | 863 | hlist_del_rcu(node); |
a513088d | 864 | batadv_tt_orig_list_entry_free_ref(orig_entry); |
db08e6e5 SW |
865 | } |
866 | } | |
867 | spin_unlock_bh(&tt_global_entry->list_lock); | |
868 | } | |
869 | ||
a513088d SE |
870 | static void batadv_tt_global_del_struct(struct bat_priv *bat_priv, |
871 | struct tt_global_entry *tt_global_entry, | |
872 | const char *message) | |
db08e6e5 | 873 | { |
1eda58bf SE |
874 | batadv_dbg(DBG_TT, bat_priv, "Deleting global tt entry %pM: %s\n", |
875 | tt_global_entry->common.addr, message); | |
7683fdc1 | 876 | |
a513088d | 877 | batadv_hash_remove(bat_priv->tt_global_hash, batadv_compare_tt, |
da641193 | 878 | batadv_choose_orig, tt_global_entry->common.addr); |
a513088d | 879 | batadv_tt_global_entry_free_ref(tt_global_entry); |
db08e6e5 | 880 | |
c6c8fea2 SE |
881 | } |
882 | ||
db08e6e5 | 883 | /* If the client is to be deleted, we check if it is the last origantor entry |
acd34afa SE |
884 | * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the |
885 | * timer, otherwise we simply remove the originator scheduled for deletion. | |
db08e6e5 | 886 | */ |
a513088d SE |
887 | static void |
888 | batadv_tt_global_del_roaming(struct bat_priv *bat_priv, | |
889 | struct tt_global_entry *tt_global_entry, | |
890 | struct orig_node *orig_node, const char *message) | |
db08e6e5 SW |
891 | { |
892 | bool last_entry = true; | |
893 | struct hlist_head *head; | |
894 | struct hlist_node *node; | |
895 | struct tt_orig_list_entry *orig_entry; | |
896 | ||
897 | /* no local entry exists, case 1: | |
898 | * Check if this is the last one or if other entries exist. | |
899 | */ | |
900 | ||
901 | rcu_read_lock(); | |
902 | head = &tt_global_entry->orig_list; | |
903 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
904 | if (orig_entry->orig_node != orig_node) { | |
905 | last_entry = false; | |
906 | break; | |
907 | } | |
908 | } | |
909 | rcu_read_unlock(); | |
910 | ||
911 | if (last_entry) { | |
912 | /* its the last one, mark for roaming. */ | |
acd34afa | 913 | tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; |
db08e6e5 SW |
914 | tt_global_entry->roam_at = jiffies; |
915 | } else | |
916 | /* there is another entry, we can simply delete this | |
917 | * one and can still use the other one. | |
918 | */ | |
a513088d SE |
919 | batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, |
920 | orig_node, message); | |
db08e6e5 SW |
921 | } |
922 | ||
923 | ||
924 | ||
a513088d SE |
925 | static void batadv_tt_global_del(struct bat_priv *bat_priv, |
926 | struct orig_node *orig_node, | |
927 | const unsigned char *addr, | |
928 | const char *message, bool roaming) | |
a73105b8 | 929 | { |
7683fdc1 | 930 | struct tt_global_entry *tt_global_entry = NULL; |
a513088d | 931 | struct tt_local_entry *local_entry = NULL; |
a73105b8 | 932 | |
a513088d | 933 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
db08e6e5 | 934 | if (!tt_global_entry) |
7683fdc1 | 935 | goto out; |
a73105b8 | 936 | |
db08e6e5 | 937 | if (!roaming) { |
a513088d SE |
938 | batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, |
939 | orig_node, message); | |
db08e6e5 SW |
940 | |
941 | if (hlist_empty(&tt_global_entry->orig_list)) | |
a513088d SE |
942 | batadv_tt_global_del_struct(bat_priv, tt_global_entry, |
943 | message); | |
db08e6e5 SW |
944 | |
945 | goto out; | |
946 | } | |
92f90f56 SE |
947 | |
948 | /* if we are deleting a global entry due to a roam | |
949 | * event, there are two possibilities: | |
db08e6e5 SW |
950 | * 1) the client roamed from node A to node B => if there |
951 | * is only one originator left for this client, we mark | |
acd34afa | 952 | * it with BATADV_TT_CLIENT_ROAM, we start a timer and we |
92f90f56 SE |
953 | * wait for node B to claim it. In case of timeout |
954 | * the entry is purged. | |
db08e6e5 SW |
955 | * |
956 | * If there are other originators left, we directly delete | |
957 | * the originator. | |
92f90f56 | 958 | * 2) the client roamed to us => we can directly delete |
9cfc7bd6 SE |
959 | * the global entry, since it is useless now. |
960 | */ | |
a513088d SE |
961 | local_entry = batadv_tt_local_hash_find(bat_priv, |
962 | tt_global_entry->common.addr); | |
963 | if (local_entry) { | |
db08e6e5 | 964 | /* local entry exists, case 2: client roamed to us. */ |
a513088d SE |
965 | batadv_tt_global_del_orig_list(tt_global_entry); |
966 | batadv_tt_global_del_struct(bat_priv, tt_global_entry, message); | |
db08e6e5 SW |
967 | } else |
968 | /* no local entry exists, case 1: check for roaming */ | |
a513088d SE |
969 | batadv_tt_global_del_roaming(bat_priv, tt_global_entry, |
970 | orig_node, message); | |
92f90f56 | 971 | |
92f90f56 | 972 | |
cc47f66e | 973 | out: |
7683fdc1 | 974 | if (tt_global_entry) |
a513088d SE |
975 | batadv_tt_global_entry_free_ref(tt_global_entry); |
976 | if (local_entry) | |
977 | batadv_tt_local_entry_free_ref(local_entry); | |
a73105b8 AQ |
978 | } |
979 | ||
08c36d3e SE |
980 | void batadv_tt_global_del_orig(struct bat_priv *bat_priv, |
981 | struct orig_node *orig_node, const char *message) | |
c6c8fea2 | 982 | { |
a513088d | 983 | struct tt_global_entry *global_entry; |
48100bac | 984 | struct tt_common_entry *tt_common_entry; |
c90681b8 | 985 | uint32_t i; |
a73105b8 AQ |
986 | struct hashtable_t *hash = bat_priv->tt_global_hash; |
987 | struct hlist_node *node, *safe; | |
988 | struct hlist_head *head; | |
7683fdc1 | 989 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c6c8fea2 | 990 | |
6e801494 SW |
991 | if (!hash) |
992 | return; | |
993 | ||
a73105b8 AQ |
994 | for (i = 0; i < hash->size; i++) { |
995 | head = &hash->table[i]; | |
7683fdc1 | 996 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 997 | |
7683fdc1 | 998 | spin_lock_bh(list_lock); |
48100bac | 999 | hlist_for_each_entry_safe(tt_common_entry, node, safe, |
7c64fd98 | 1000 | head, hash_entry) { |
a513088d SE |
1001 | global_entry = container_of(tt_common_entry, |
1002 | struct tt_global_entry, | |
1003 | common); | |
db08e6e5 | 1004 | |
a513088d SE |
1005 | batadv_tt_global_del_orig_entry(bat_priv, global_entry, |
1006 | orig_node, message); | |
db08e6e5 | 1007 | |
a513088d | 1008 | if (hlist_empty(&global_entry->orig_list)) { |
1eda58bf SE |
1009 | batadv_dbg(DBG_TT, bat_priv, |
1010 | "Deleting global tt entry %pM: %s\n", | |
a513088d | 1011 | global_entry->common.addr, message); |
7683fdc1 | 1012 | hlist_del_rcu(node); |
a513088d | 1013 | batadv_tt_global_entry_free_ref(global_entry); |
7683fdc1 | 1014 | } |
a73105b8 | 1015 | } |
7683fdc1 | 1016 | spin_unlock_bh(list_lock); |
c6c8fea2 | 1017 | } |
17071578 | 1018 | orig_node->tt_initialised = false; |
c6c8fea2 SE |
1019 | } |
1020 | ||
42d0b044 SE |
1021 | static void batadv_tt_global_roam_purge_list(struct bat_priv *bat_priv, |
1022 | struct hlist_head *head) | |
cc47f66e | 1023 | { |
48100bac | 1024 | struct tt_common_entry *tt_common_entry; |
cc47f66e AQ |
1025 | struct tt_global_entry *tt_global_entry; |
1026 | struct hlist_node *node, *node_tmp; | |
42d0b044 SE |
1027 | |
1028 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, head, | |
1029 | hash_entry) { | |
1030 | tt_global_entry = container_of(tt_common_entry, | |
1031 | struct tt_global_entry, common); | |
acd34afa | 1032 | if (!(tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM)) |
42d0b044 SE |
1033 | continue; |
1034 | if (!batadv_has_timed_out(tt_global_entry->roam_at, | |
1035 | BATADV_TT_CLIENT_ROAM_TIMEOUT)) | |
1036 | continue; | |
1037 | ||
1038 | batadv_dbg(DBG_TT, bat_priv, | |
1039 | "Deleting global tt entry (%pM): Roaming timeout\n", | |
1040 | tt_global_entry->common.addr); | |
1041 | ||
1042 | hlist_del_rcu(node); | |
1043 | batadv_tt_global_entry_free_ref(tt_global_entry); | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | static void batadv_tt_global_roam_purge(struct bat_priv *bat_priv) | |
1048 | { | |
1049 | struct hashtable_t *hash = bat_priv->tt_global_hash; | |
cc47f66e | 1050 | struct hlist_head *head; |
7683fdc1 | 1051 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 1052 | uint32_t i; |
cc47f66e | 1053 | |
cc47f66e AQ |
1054 | for (i = 0; i < hash->size; i++) { |
1055 | head = &hash->table[i]; | |
7683fdc1 | 1056 | list_lock = &hash->list_locks[i]; |
cc47f66e | 1057 | |
7683fdc1 | 1058 | spin_lock_bh(list_lock); |
42d0b044 | 1059 | batadv_tt_global_roam_purge_list(bat_priv, head); |
7683fdc1 | 1060 | spin_unlock_bh(list_lock); |
cc47f66e AQ |
1061 | } |
1062 | ||
cc47f66e AQ |
1063 | } |
1064 | ||
a513088d | 1065 | static void batadv_tt_global_table_free(struct bat_priv *bat_priv) |
c6c8fea2 | 1066 | { |
7683fdc1 AQ |
1067 | struct hashtable_t *hash; |
1068 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
48100bac | 1069 | struct tt_common_entry *tt_common_entry; |
7683fdc1 AQ |
1070 | struct tt_global_entry *tt_global_entry; |
1071 | struct hlist_node *node, *node_tmp; | |
1072 | struct hlist_head *head; | |
c90681b8 | 1073 | uint32_t i; |
7683fdc1 | 1074 | |
2dafb49d | 1075 | if (!bat_priv->tt_global_hash) |
c6c8fea2 SE |
1076 | return; |
1077 | ||
7683fdc1 AQ |
1078 | hash = bat_priv->tt_global_hash; |
1079 | ||
1080 | for (i = 0; i < hash->size; i++) { | |
1081 | head = &hash->table[i]; | |
1082 | list_lock = &hash->list_locks[i]; | |
1083 | ||
1084 | spin_lock_bh(list_lock); | |
48100bac | 1085 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
7683fdc1 AQ |
1086 | head, hash_entry) { |
1087 | hlist_del_rcu(node); | |
48100bac AQ |
1088 | tt_global_entry = container_of(tt_common_entry, |
1089 | struct tt_global_entry, | |
1090 | common); | |
a513088d | 1091 | batadv_tt_global_entry_free_ref(tt_global_entry); |
7683fdc1 AQ |
1092 | } |
1093 | spin_unlock_bh(list_lock); | |
1094 | } | |
1095 | ||
1a8eaf07 | 1096 | batadv_hash_destroy(hash); |
7683fdc1 | 1097 | |
2dafb49d | 1098 | bat_priv->tt_global_hash = NULL; |
c6c8fea2 SE |
1099 | } |
1100 | ||
a513088d SE |
1101 | static bool _batadv_is_ap_isolated(struct tt_local_entry *tt_local_entry, |
1102 | struct tt_global_entry *tt_global_entry) | |
59b699cd AQ |
1103 | { |
1104 | bool ret = false; | |
1105 | ||
acd34afa SE |
1106 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI && |
1107 | tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI) | |
59b699cd AQ |
1108 | ret = true; |
1109 | ||
1110 | return ret; | |
1111 | } | |
1112 | ||
08c36d3e SE |
1113 | struct orig_node *batadv_transtable_search(struct bat_priv *bat_priv, |
1114 | const uint8_t *src, | |
1115 | const uint8_t *addr) | |
c6c8fea2 | 1116 | { |
3d393e47 AQ |
1117 | struct tt_local_entry *tt_local_entry = NULL; |
1118 | struct tt_global_entry *tt_global_entry = NULL; | |
7b36e8ee | 1119 | struct orig_node *orig_node = NULL; |
db08e6e5 SW |
1120 | struct neigh_node *router = NULL; |
1121 | struct hlist_head *head; | |
1122 | struct hlist_node *node; | |
1123 | struct tt_orig_list_entry *orig_entry; | |
1124 | int best_tq; | |
c6c8fea2 | 1125 | |
3d393e47 | 1126 | if (src && atomic_read(&bat_priv->ap_isolation)) { |
a513088d | 1127 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, src); |
3d393e47 AQ |
1128 | if (!tt_local_entry) |
1129 | goto out; | |
1130 | } | |
7aadf889 | 1131 | |
a513088d | 1132 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
2dafb49d | 1133 | if (!tt_global_entry) |
7b36e8ee | 1134 | goto out; |
7aadf889 | 1135 | |
3d393e47 | 1136 | /* check whether the clients should not communicate due to AP |
9cfc7bd6 SE |
1137 | * isolation |
1138 | */ | |
a513088d SE |
1139 | if (tt_local_entry && |
1140 | _batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) | |
3d393e47 AQ |
1141 | goto out; |
1142 | ||
db08e6e5 | 1143 | best_tq = 0; |
c6c8fea2 | 1144 | |
db08e6e5 SW |
1145 | rcu_read_lock(); |
1146 | head = &tt_global_entry->orig_list; | |
1147 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
7d211efc | 1148 | router = batadv_orig_node_get_router(orig_entry->orig_node); |
db08e6e5 SW |
1149 | if (!router) |
1150 | continue; | |
c6c8fea2 | 1151 | |
db08e6e5 SW |
1152 | if (router->tq_avg > best_tq) { |
1153 | orig_node = orig_entry->orig_node; | |
1154 | best_tq = router->tq_avg; | |
1155 | } | |
7d211efc | 1156 | batadv_neigh_node_free_ref(router); |
db08e6e5 SW |
1157 | } |
1158 | /* found anything? */ | |
1159 | if (orig_node && !atomic_inc_not_zero(&orig_node->refcount)) | |
1160 | orig_node = NULL; | |
1161 | rcu_read_unlock(); | |
7b36e8ee | 1162 | out: |
3d393e47 | 1163 | if (tt_global_entry) |
a513088d | 1164 | batadv_tt_global_entry_free_ref(tt_global_entry); |
3d393e47 | 1165 | if (tt_local_entry) |
a513088d | 1166 | batadv_tt_local_entry_free_ref(tt_local_entry); |
3d393e47 | 1167 | |
7b36e8ee | 1168 | return orig_node; |
c6c8fea2 | 1169 | } |
a73105b8 AQ |
1170 | |
1171 | /* Calculates the checksum of the local table of a given orig_node */ | |
a513088d SE |
1172 | static uint16_t batadv_tt_global_crc(struct bat_priv *bat_priv, |
1173 | struct orig_node *orig_node) | |
a73105b8 AQ |
1174 | { |
1175 | uint16_t total = 0, total_one; | |
1176 | struct hashtable_t *hash = bat_priv->tt_global_hash; | |
acd34afa | 1177 | struct tt_common_entry *tt_common; |
a73105b8 AQ |
1178 | struct tt_global_entry *tt_global_entry; |
1179 | struct hlist_node *node; | |
1180 | struct hlist_head *head; | |
c90681b8 AQ |
1181 | uint32_t i; |
1182 | int j; | |
a73105b8 AQ |
1183 | |
1184 | for (i = 0; i < hash->size; i++) { | |
1185 | head = &hash->table[i]; | |
1186 | ||
1187 | rcu_read_lock(); | |
acd34afa SE |
1188 | hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) { |
1189 | tt_global_entry = container_of(tt_common, | |
48100bac AQ |
1190 | struct tt_global_entry, |
1191 | common); | |
db08e6e5 SW |
1192 | /* Roaming clients are in the global table for |
1193 | * consistency only. They don't have to be | |
1194 | * taken into account while computing the | |
1195 | * global crc | |
1196 | */ | |
acd34afa | 1197 | if (tt_common->flags & BATADV_TT_CLIENT_ROAM) |
db08e6e5 SW |
1198 | continue; |
1199 | ||
1200 | /* find out if this global entry is announced by this | |
1201 | * originator | |
1202 | */ | |
a513088d SE |
1203 | if (!batadv_tt_global_entry_has_orig(tt_global_entry, |
1204 | orig_node)) | |
db08e6e5 SW |
1205 | continue; |
1206 | ||
1207 | total_one = 0; | |
1208 | for (j = 0; j < ETH_ALEN; j++) | |
1209 | total_one = crc16_byte(total_one, | |
acd34afa | 1210 | tt_common->addr[j]); |
db08e6e5 | 1211 | total ^= total_one; |
a73105b8 AQ |
1212 | } |
1213 | rcu_read_unlock(); | |
1214 | } | |
1215 | ||
1216 | return total; | |
1217 | } | |
1218 | ||
1219 | /* Calculates the checksum of the local table */ | |
be9aa4c1 | 1220 | static uint16_t batadv_tt_local_crc(struct bat_priv *bat_priv) |
a73105b8 AQ |
1221 | { |
1222 | uint16_t total = 0, total_one; | |
1223 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
acd34afa | 1224 | struct tt_common_entry *tt_common; |
a73105b8 AQ |
1225 | struct hlist_node *node; |
1226 | struct hlist_head *head; | |
c90681b8 AQ |
1227 | uint32_t i; |
1228 | int j; | |
a73105b8 AQ |
1229 | |
1230 | for (i = 0; i < hash->size; i++) { | |
1231 | head = &hash->table[i]; | |
1232 | ||
1233 | rcu_read_lock(); | |
acd34afa | 1234 | hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) { |
058d0e26 | 1235 | /* not yet committed clients have not to be taken into |
9cfc7bd6 SE |
1236 | * account while computing the CRC |
1237 | */ | |
acd34afa | 1238 | if (tt_common->flags & BATADV_TT_CLIENT_NEW) |
058d0e26 | 1239 | continue; |
a73105b8 AQ |
1240 | total_one = 0; |
1241 | for (j = 0; j < ETH_ALEN; j++) | |
1242 | total_one = crc16_byte(total_one, | |
acd34afa | 1243 | tt_common->addr[j]); |
a73105b8 AQ |
1244 | total ^= total_one; |
1245 | } | |
a73105b8 AQ |
1246 | rcu_read_unlock(); |
1247 | } | |
1248 | ||
1249 | return total; | |
1250 | } | |
1251 | ||
a513088d | 1252 | static void batadv_tt_req_list_free(struct bat_priv *bat_priv) |
a73105b8 AQ |
1253 | { |
1254 | struct tt_req_node *node, *safe; | |
1255 | ||
1256 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1257 | ||
1258 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
1259 | list_del(&node->list); | |
1260 | kfree(node); | |
1261 | } | |
1262 | ||
1263 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1264 | } | |
1265 | ||
a513088d SE |
1266 | static void batadv_tt_save_orig_buffer(struct bat_priv *bat_priv, |
1267 | struct orig_node *orig_node, | |
1268 | const unsigned char *tt_buff, | |
1269 | uint8_t tt_num_changes) | |
a73105b8 | 1270 | { |
08c36d3e | 1271 | uint16_t tt_buff_len = batadv_tt_len(tt_num_changes); |
a73105b8 AQ |
1272 | |
1273 | /* Replace the old buffer only if I received something in the | |
9cfc7bd6 SE |
1274 | * last OGM (the OGM could carry no changes) |
1275 | */ | |
a73105b8 AQ |
1276 | spin_lock_bh(&orig_node->tt_buff_lock); |
1277 | if (tt_buff_len > 0) { | |
1278 | kfree(orig_node->tt_buff); | |
1279 | orig_node->tt_buff_len = 0; | |
1280 | orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); | |
1281 | if (orig_node->tt_buff) { | |
1282 | memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); | |
1283 | orig_node->tt_buff_len = tt_buff_len; | |
1284 | } | |
1285 | } | |
1286 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1287 | } | |
1288 | ||
a513088d | 1289 | static void batadv_tt_req_purge(struct bat_priv *bat_priv) |
a73105b8 AQ |
1290 | { |
1291 | struct tt_req_node *node, *safe; | |
1292 | ||
1293 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1294 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
42d0b044 SE |
1295 | if (batadv_has_timed_out(node->issued_at, |
1296 | BATADV_TT_REQUEST_TIMEOUT)) { | |
a73105b8 AQ |
1297 | list_del(&node->list); |
1298 | kfree(node); | |
1299 | } | |
1300 | } | |
1301 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1302 | } | |
1303 | ||
1304 | /* returns the pointer to the new tt_req_node struct if no request | |
9cfc7bd6 SE |
1305 | * has already been issued for this orig_node, NULL otherwise |
1306 | */ | |
a513088d SE |
1307 | static struct tt_req_node *batadv_new_tt_req_node(struct bat_priv *bat_priv, |
1308 | struct orig_node *orig_node) | |
a73105b8 AQ |
1309 | { |
1310 | struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; | |
1311 | ||
1312 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1313 | list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) { | |
1eda58bf SE |
1314 | if (batadv_compare_eth(tt_req_node_tmp, orig_node) && |
1315 | !batadv_has_timed_out(tt_req_node_tmp->issued_at, | |
42d0b044 | 1316 | BATADV_TT_REQUEST_TIMEOUT)) |
a73105b8 AQ |
1317 | goto unlock; |
1318 | } | |
1319 | ||
1320 | tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); | |
1321 | if (!tt_req_node) | |
1322 | goto unlock; | |
1323 | ||
1324 | memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); | |
1325 | tt_req_node->issued_at = jiffies; | |
1326 | ||
1327 | list_add(&tt_req_node->list, &bat_priv->tt_req_list); | |
1328 | unlock: | |
1329 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1330 | return tt_req_node; | |
1331 | } | |
1332 | ||
058d0e26 | 1333 | /* data_ptr is useless here, but has to be kept to respect the prototype */ |
a513088d SE |
1334 | static int batadv_tt_local_valid_entry(const void *entry_ptr, |
1335 | const void *data_ptr) | |
058d0e26 | 1336 | { |
48100bac | 1337 | const struct tt_common_entry *tt_common_entry = entry_ptr; |
058d0e26 | 1338 | |
acd34afa | 1339 | if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW) |
058d0e26 AQ |
1340 | return 0; |
1341 | return 1; | |
1342 | } | |
1343 | ||
a513088d SE |
1344 | static int batadv_tt_global_valid(const void *entry_ptr, |
1345 | const void *data_ptr) | |
a73105b8 | 1346 | { |
48100bac AQ |
1347 | const struct tt_common_entry *tt_common_entry = entry_ptr; |
1348 | const struct tt_global_entry *tt_global_entry; | |
a73105b8 AQ |
1349 | const struct orig_node *orig_node = data_ptr; |
1350 | ||
acd34afa | 1351 | if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM) |
cc47f66e AQ |
1352 | return 0; |
1353 | ||
48100bac AQ |
1354 | tt_global_entry = container_of(tt_common_entry, struct tt_global_entry, |
1355 | common); | |
1356 | ||
a513088d | 1357 | return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node); |
a73105b8 AQ |
1358 | } |
1359 | ||
a513088d SE |
1360 | static struct sk_buff * |
1361 | batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, | |
1362 | struct hashtable_t *hash, | |
1363 | struct hard_iface *primary_if, | |
1364 | int (*valid_cb)(const void *, const void *), | |
1365 | void *cb_data) | |
a73105b8 | 1366 | { |
48100bac | 1367 | struct tt_common_entry *tt_common_entry; |
a73105b8 AQ |
1368 | struct tt_query_packet *tt_response; |
1369 | struct tt_change *tt_change; | |
1370 | struct hlist_node *node; | |
1371 | struct hlist_head *head; | |
1372 | struct sk_buff *skb = NULL; | |
1373 | uint16_t tt_tot, tt_count; | |
1374 | ssize_t tt_query_size = sizeof(struct tt_query_packet); | |
c90681b8 | 1375 | uint32_t i; |
a73105b8 AQ |
1376 | |
1377 | if (tt_query_size + tt_len > primary_if->soft_iface->mtu) { | |
1378 | tt_len = primary_if->soft_iface->mtu - tt_query_size; | |
1379 | tt_len -= tt_len % sizeof(struct tt_change); | |
1380 | } | |
1381 | tt_tot = tt_len / sizeof(struct tt_change); | |
1382 | ||
1383 | skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN); | |
1384 | if (!skb) | |
1385 | goto out; | |
1386 | ||
1387 | skb_reserve(skb, ETH_HLEN); | |
1388 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1389 | tt_query_size + tt_len); | |
1390 | tt_response->ttvn = ttvn; | |
a73105b8 AQ |
1391 | |
1392 | tt_change = (struct tt_change *)(skb->data + tt_query_size); | |
1393 | tt_count = 0; | |
1394 | ||
1395 | rcu_read_lock(); | |
1396 | for (i = 0; i < hash->size; i++) { | |
1397 | head = &hash->table[i]; | |
1398 | ||
48100bac | 1399 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 AQ |
1400 | head, hash_entry) { |
1401 | if (tt_count == tt_tot) | |
1402 | break; | |
1403 | ||
48100bac | 1404 | if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data))) |
a73105b8 AQ |
1405 | continue; |
1406 | ||
48100bac AQ |
1407 | memcpy(tt_change->addr, tt_common_entry->addr, |
1408 | ETH_ALEN); | |
42d0b044 | 1409 | tt_change->flags = BATADV_NO_FLAGS; |
a73105b8 AQ |
1410 | |
1411 | tt_count++; | |
1412 | tt_change++; | |
1413 | } | |
1414 | } | |
1415 | rcu_read_unlock(); | |
1416 | ||
9d852393 | 1417 | /* store in the message the number of entries we have successfully |
9cfc7bd6 SE |
1418 | * copied |
1419 | */ | |
9d852393 AQ |
1420 | tt_response->tt_data = htons(tt_count); |
1421 | ||
a73105b8 AQ |
1422 | out: |
1423 | return skb; | |
1424 | } | |
1425 | ||
a513088d SE |
1426 | static int batadv_send_tt_request(struct bat_priv *bat_priv, |
1427 | struct orig_node *dst_orig_node, | |
1428 | uint8_t ttvn, uint16_t tt_crc, | |
1429 | bool full_table) | |
a73105b8 AQ |
1430 | { |
1431 | struct sk_buff *skb = NULL; | |
1432 | struct tt_query_packet *tt_request; | |
1433 | struct neigh_node *neigh_node = NULL; | |
1434 | struct hard_iface *primary_if; | |
1435 | struct tt_req_node *tt_req_node = NULL; | |
1436 | int ret = 1; | |
1437 | ||
e5d89254 | 1438 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1439 | if (!primary_if) |
1440 | goto out; | |
1441 | ||
1442 | /* The new tt_req will be issued only if I'm not waiting for a | |
9cfc7bd6 SE |
1443 | * reply from the same orig_node yet |
1444 | */ | |
a513088d | 1445 | tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node); |
a73105b8 AQ |
1446 | if (!tt_req_node) |
1447 | goto out; | |
1448 | ||
1449 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN); | |
1450 | if (!skb) | |
1451 | goto out; | |
1452 | ||
1453 | skb_reserve(skb, ETH_HLEN); | |
1454 | ||
1455 | tt_request = (struct tt_query_packet *)skb_put(skb, | |
1456 | sizeof(struct tt_query_packet)); | |
1457 | ||
acd34afa | 1458 | tt_request->header.packet_type = BATADV_TT_QUERY; |
7e071c79 | 1459 | tt_request->header.version = BATADV_COMPAT_VERSION; |
a73105b8 AQ |
1460 | memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1461 | memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN); | |
42d0b044 | 1462 | tt_request->header.ttl = BATADV_TTL; |
a73105b8 | 1463 | tt_request->ttvn = ttvn; |
6d2003fc | 1464 | tt_request->tt_data = htons(tt_crc); |
acd34afa | 1465 | tt_request->flags = BATADV_TT_REQUEST; |
a73105b8 AQ |
1466 | |
1467 | if (full_table) | |
acd34afa | 1468 | tt_request->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1469 | |
7d211efc | 1470 | neigh_node = batadv_orig_node_get_router(dst_orig_node); |
a73105b8 AQ |
1471 | if (!neigh_node) |
1472 | goto out; | |
1473 | ||
1eda58bf SE |
1474 | batadv_dbg(DBG_TT, bat_priv, |
1475 | "Sending TT_REQUEST to %pM via %pM [%c]\n", | |
1476 | dst_orig_node->orig, neigh_node->addr, | |
1477 | (full_table ? 'F' : '.')); | |
a73105b8 | 1478 | |
d69909d2 | 1479 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX); |
f8214865 | 1480 | |
9455e34c | 1481 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1482 | ret = 0; |
1483 | ||
1484 | out: | |
1485 | if (neigh_node) | |
7d211efc | 1486 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1487 | if (primary_if) |
e5d89254 | 1488 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1489 | if (ret) |
1490 | kfree_skb(skb); | |
1491 | if (ret && tt_req_node) { | |
1492 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1493 | list_del(&tt_req_node->list); | |
1494 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1495 | kfree(tt_req_node); | |
1496 | } | |
1497 | return ret; | |
1498 | } | |
1499 | ||
a513088d SE |
1500 | static bool batadv_send_other_tt_response(struct bat_priv *bat_priv, |
1501 | struct tt_query_packet *tt_request) | |
a73105b8 AQ |
1502 | { |
1503 | struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL; | |
1504 | struct neigh_node *neigh_node = NULL; | |
1505 | struct hard_iface *primary_if = NULL; | |
1506 | uint8_t orig_ttvn, req_ttvn, ttvn; | |
1507 | int ret = false; | |
1508 | unsigned char *tt_buff; | |
1509 | bool full_table; | |
1510 | uint16_t tt_len, tt_tot; | |
1511 | struct sk_buff *skb = NULL; | |
1512 | struct tt_query_packet *tt_response; | |
1513 | ||
1eda58bf SE |
1514 | batadv_dbg(DBG_TT, bat_priv, |
1515 | "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", | |
1516 | tt_request->src, tt_request->ttvn, tt_request->dst, | |
acd34afa | 1517 | (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 AQ |
1518 | |
1519 | /* Let's get the orig node of the REAL destination */ | |
da641193 | 1520 | req_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->dst); |
a73105b8 AQ |
1521 | if (!req_dst_orig_node) |
1522 | goto out; | |
1523 | ||
da641193 | 1524 | res_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1525 | if (!res_dst_orig_node) |
1526 | goto out; | |
1527 | ||
7d211efc | 1528 | neigh_node = batadv_orig_node_get_router(res_dst_orig_node); |
a73105b8 AQ |
1529 | if (!neigh_node) |
1530 | goto out; | |
1531 | ||
e5d89254 | 1532 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1533 | if (!primary_if) |
1534 | goto out; | |
1535 | ||
1536 | orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1537 | req_ttvn = tt_request->ttvn; | |
1538 | ||
015758d0 | 1539 | /* I don't have the requested data */ |
a73105b8 | 1540 | if (orig_ttvn != req_ttvn || |
f25bd58a | 1541 | tt_request->tt_data != htons(req_dst_orig_node->tt_crc)) |
a73105b8 AQ |
1542 | goto out; |
1543 | ||
015758d0 | 1544 | /* If the full table has been explicitly requested */ |
acd34afa | 1545 | if (tt_request->flags & BATADV_TT_FULL_TABLE || |
a73105b8 AQ |
1546 | !req_dst_orig_node->tt_buff) |
1547 | full_table = true; | |
1548 | else | |
1549 | full_table = false; | |
1550 | ||
1551 | /* In this version, fragmentation is not implemented, then | |
9cfc7bd6 SE |
1552 | * I'll send only one packet with as much TT entries as I can |
1553 | */ | |
a73105b8 AQ |
1554 | if (!full_table) { |
1555 | spin_lock_bh(&req_dst_orig_node->tt_buff_lock); | |
1556 | tt_len = req_dst_orig_node->tt_buff_len; | |
1557 | tt_tot = tt_len / sizeof(struct tt_change); | |
1558 | ||
1559 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + | |
1560 | tt_len + ETH_HLEN); | |
1561 | if (!skb) | |
1562 | goto unlock; | |
1563 | ||
1564 | skb_reserve(skb, ETH_HLEN); | |
1565 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1566 | sizeof(struct tt_query_packet) + tt_len); | |
1567 | tt_response->ttvn = req_ttvn; | |
1568 | tt_response->tt_data = htons(tt_tot); | |
1569 | ||
1570 | tt_buff = skb->data + sizeof(struct tt_query_packet); | |
1571 | /* Copy the last orig_node's OGM buffer */ | |
1572 | memcpy(tt_buff, req_dst_orig_node->tt_buff, | |
1573 | req_dst_orig_node->tt_buff_len); | |
1574 | ||
1575 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1576 | } else { | |
1577 | tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) * | |
1578 | sizeof(struct tt_change); | |
1579 | ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1580 | ||
a513088d SE |
1581 | skb = batadv_tt_response_fill_table(tt_len, ttvn, |
1582 | bat_priv->tt_global_hash, | |
1583 | primary_if, | |
1584 | batadv_tt_global_valid, | |
1585 | req_dst_orig_node); | |
a73105b8 AQ |
1586 | if (!skb) |
1587 | goto out; | |
1588 | ||
1589 | tt_response = (struct tt_query_packet *)skb->data; | |
1590 | } | |
1591 | ||
acd34afa | 1592 | tt_response->header.packet_type = BATADV_TT_QUERY; |
7e071c79 | 1593 | tt_response->header.version = BATADV_COMPAT_VERSION; |
42d0b044 | 1594 | tt_response->header.ttl = BATADV_TTL; |
a73105b8 AQ |
1595 | memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN); |
1596 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
acd34afa | 1597 | tt_response->flags = BATADV_TT_RESPONSE; |
a73105b8 AQ |
1598 | |
1599 | if (full_table) | |
acd34afa | 1600 | tt_response->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1601 | |
1eda58bf SE |
1602 | batadv_dbg(DBG_TT, bat_priv, |
1603 | "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n", | |
1604 | res_dst_orig_node->orig, neigh_node->addr, | |
1605 | req_dst_orig_node->orig, req_ttvn); | |
a73105b8 | 1606 | |
d69909d2 | 1607 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); |
f8214865 | 1608 | |
9455e34c | 1609 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1610 | ret = true; |
1611 | goto out; | |
1612 | ||
1613 | unlock: | |
1614 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1615 | ||
1616 | out: | |
1617 | if (res_dst_orig_node) | |
7d211efc | 1618 | batadv_orig_node_free_ref(res_dst_orig_node); |
a73105b8 | 1619 | if (req_dst_orig_node) |
7d211efc | 1620 | batadv_orig_node_free_ref(req_dst_orig_node); |
a73105b8 | 1621 | if (neigh_node) |
7d211efc | 1622 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1623 | if (primary_if) |
e5d89254 | 1624 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1625 | if (!ret) |
1626 | kfree_skb(skb); | |
1627 | return ret; | |
1628 | ||
1629 | } | |
a513088d SE |
1630 | static bool batadv_send_my_tt_response(struct bat_priv *bat_priv, |
1631 | struct tt_query_packet *tt_request) | |
a73105b8 AQ |
1632 | { |
1633 | struct orig_node *orig_node = NULL; | |
1634 | struct neigh_node *neigh_node = NULL; | |
1635 | struct hard_iface *primary_if = NULL; | |
1636 | uint8_t my_ttvn, req_ttvn, ttvn; | |
1637 | int ret = false; | |
1638 | unsigned char *tt_buff; | |
1639 | bool full_table; | |
1640 | uint16_t tt_len, tt_tot; | |
1641 | struct sk_buff *skb = NULL; | |
1642 | struct tt_query_packet *tt_response; | |
1643 | ||
1eda58bf SE |
1644 | batadv_dbg(DBG_TT, bat_priv, |
1645 | "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", | |
1646 | tt_request->src, tt_request->ttvn, | |
acd34afa | 1647 | (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 AQ |
1648 | |
1649 | ||
1650 | my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1651 | req_ttvn = tt_request->ttvn; | |
1652 | ||
da641193 | 1653 | orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1654 | if (!orig_node) |
1655 | goto out; | |
1656 | ||
7d211efc | 1657 | neigh_node = batadv_orig_node_get_router(orig_node); |
a73105b8 AQ |
1658 | if (!neigh_node) |
1659 | goto out; | |
1660 | ||
e5d89254 | 1661 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1662 | if (!primary_if) |
1663 | goto out; | |
1664 | ||
1665 | /* If the full table has been explicitly requested or the gap | |
9cfc7bd6 SE |
1666 | * is too big send the whole local translation table |
1667 | */ | |
acd34afa | 1668 | if (tt_request->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn || |
a73105b8 AQ |
1669 | !bat_priv->tt_buff) |
1670 | full_table = true; | |
1671 | else | |
1672 | full_table = false; | |
1673 | ||
1674 | /* In this version, fragmentation is not implemented, then | |
9cfc7bd6 SE |
1675 | * I'll send only one packet with as much TT entries as I can |
1676 | */ | |
a73105b8 AQ |
1677 | if (!full_table) { |
1678 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
1679 | tt_len = bat_priv->tt_buff_len; | |
1680 | tt_tot = tt_len / sizeof(struct tt_change); | |
1681 | ||
1682 | skb = dev_alloc_skb(sizeof(struct tt_query_packet) + | |
1683 | tt_len + ETH_HLEN); | |
1684 | if (!skb) | |
1685 | goto unlock; | |
1686 | ||
1687 | skb_reserve(skb, ETH_HLEN); | |
1688 | tt_response = (struct tt_query_packet *)skb_put(skb, | |
1689 | sizeof(struct tt_query_packet) + tt_len); | |
1690 | tt_response->ttvn = req_ttvn; | |
1691 | tt_response->tt_data = htons(tt_tot); | |
1692 | ||
1693 | tt_buff = skb->data + sizeof(struct tt_query_packet); | |
1694 | memcpy(tt_buff, bat_priv->tt_buff, | |
1695 | bat_priv->tt_buff_len); | |
1696 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1697 | } else { | |
1698 | tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) * | |
1699 | sizeof(struct tt_change); | |
1700 | ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1701 | ||
a513088d SE |
1702 | skb = batadv_tt_response_fill_table(tt_len, ttvn, |
1703 | bat_priv->tt_local_hash, | |
1704 | primary_if, | |
1705 | batadv_tt_local_valid_entry, | |
1706 | NULL); | |
a73105b8 AQ |
1707 | if (!skb) |
1708 | goto out; | |
1709 | ||
1710 | tt_response = (struct tt_query_packet *)skb->data; | |
1711 | } | |
1712 | ||
acd34afa | 1713 | tt_response->header.packet_type = BATADV_TT_QUERY; |
7e071c79 | 1714 | tt_response->header.version = BATADV_COMPAT_VERSION; |
42d0b044 | 1715 | tt_response->header.ttl = BATADV_TTL; |
a73105b8 AQ |
1716 | memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1717 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
acd34afa | 1718 | tt_response->flags = BATADV_TT_RESPONSE; |
a73105b8 AQ |
1719 | |
1720 | if (full_table) | |
acd34afa | 1721 | tt_response->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1722 | |
1eda58bf SE |
1723 | batadv_dbg(DBG_TT, bat_priv, |
1724 | "Sending TT_RESPONSE to %pM via %pM [%c]\n", | |
1725 | orig_node->orig, neigh_node->addr, | |
acd34afa | 1726 | (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 | 1727 | |
d69909d2 | 1728 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); |
f8214865 | 1729 | |
9455e34c | 1730 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1731 | ret = true; |
1732 | goto out; | |
1733 | ||
1734 | unlock: | |
1735 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1736 | out: | |
1737 | if (orig_node) | |
7d211efc | 1738 | batadv_orig_node_free_ref(orig_node); |
a73105b8 | 1739 | if (neigh_node) |
7d211efc | 1740 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1741 | if (primary_if) |
e5d89254 | 1742 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1743 | if (!ret) |
1744 | kfree_skb(skb); | |
1745 | /* This packet was for me, so it doesn't need to be re-routed */ | |
1746 | return true; | |
1747 | } | |
1748 | ||
08c36d3e SE |
1749 | bool batadv_send_tt_response(struct bat_priv *bat_priv, |
1750 | struct tt_query_packet *tt_request) | |
a73105b8 | 1751 | { |
3193e8fd | 1752 | if (batadv_is_my_mac(tt_request->dst)) { |
20ff9d59 | 1753 | /* don't answer backbone gws! */ |
08adf151 | 1754 | if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src)) |
20ff9d59 SW |
1755 | return true; |
1756 | ||
a513088d | 1757 | return batadv_send_my_tt_response(bat_priv, tt_request); |
20ff9d59 | 1758 | } else { |
a513088d | 1759 | return batadv_send_other_tt_response(bat_priv, tt_request); |
20ff9d59 | 1760 | } |
a73105b8 AQ |
1761 | } |
1762 | ||
a513088d SE |
1763 | static void _batadv_tt_update_changes(struct bat_priv *bat_priv, |
1764 | struct orig_node *orig_node, | |
1765 | struct tt_change *tt_change, | |
1766 | uint16_t tt_num_changes, uint8_t ttvn) | |
a73105b8 AQ |
1767 | { |
1768 | int i; | |
a513088d | 1769 | int roams; |
a73105b8 AQ |
1770 | |
1771 | for (i = 0; i < tt_num_changes; i++) { | |
acd34afa SE |
1772 | if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) { |
1773 | roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM; | |
a513088d SE |
1774 | batadv_tt_global_del(bat_priv, orig_node, |
1775 | (tt_change + i)->addr, | |
d4f44692 AQ |
1776 | "tt removed by changes", |
1777 | roams); | |
08c36d3e | 1778 | } else { |
08c36d3e | 1779 | if (!batadv_tt_global_add(bat_priv, orig_node, |
d4f44692 AQ |
1780 | (tt_change + i)->addr, |
1781 | (tt_change + i)->flags, ttvn)) | |
a73105b8 AQ |
1782 | /* In case of problem while storing a |
1783 | * global_entry, we stop the updating | |
1784 | * procedure without committing the | |
1785 | * ttvn change. This will avoid to send | |
1786 | * corrupted data on tt_request | |
1787 | */ | |
1788 | return; | |
08c36d3e | 1789 | } |
a73105b8 | 1790 | } |
17071578 | 1791 | orig_node->tt_initialised = true; |
a73105b8 AQ |
1792 | } |
1793 | ||
a513088d SE |
1794 | static void batadv_tt_fill_gtable(struct bat_priv *bat_priv, |
1795 | struct tt_query_packet *tt_response) | |
a73105b8 AQ |
1796 | { |
1797 | struct orig_node *orig_node = NULL; | |
1798 | ||
da641193 | 1799 | orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); |
a73105b8 AQ |
1800 | if (!orig_node) |
1801 | goto out; | |
1802 | ||
1803 | /* Purge the old table first.. */ | |
08c36d3e | 1804 | batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table"); |
a73105b8 | 1805 | |
a513088d SE |
1806 | _batadv_tt_update_changes(bat_priv, orig_node, |
1807 | (struct tt_change *)(tt_response + 1), | |
1808 | ntohs(tt_response->tt_data), | |
1809 | tt_response->ttvn); | |
a73105b8 AQ |
1810 | |
1811 | spin_lock_bh(&orig_node->tt_buff_lock); | |
1812 | kfree(orig_node->tt_buff); | |
1813 | orig_node->tt_buff_len = 0; | |
1814 | orig_node->tt_buff = NULL; | |
1815 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1816 | ||
1817 | atomic_set(&orig_node->last_ttvn, tt_response->ttvn); | |
1818 | ||
1819 | out: | |
1820 | if (orig_node) | |
7d211efc | 1821 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
1822 | } |
1823 | ||
a513088d SE |
1824 | static void batadv_tt_update_changes(struct bat_priv *bat_priv, |
1825 | struct orig_node *orig_node, | |
1826 | uint16_t tt_num_changes, uint8_t ttvn, | |
1827 | struct tt_change *tt_change) | |
a73105b8 | 1828 | { |
a513088d SE |
1829 | _batadv_tt_update_changes(bat_priv, orig_node, tt_change, |
1830 | tt_num_changes, ttvn); | |
a73105b8 | 1831 | |
a513088d SE |
1832 | batadv_tt_save_orig_buffer(bat_priv, orig_node, |
1833 | (unsigned char *)tt_change, tt_num_changes); | |
a73105b8 AQ |
1834 | atomic_set(&orig_node->last_ttvn, ttvn); |
1835 | } | |
1836 | ||
08c36d3e | 1837 | bool batadv_is_my_client(struct bat_priv *bat_priv, const uint8_t *addr) |
a73105b8 | 1838 | { |
7683fdc1 AQ |
1839 | struct tt_local_entry *tt_local_entry = NULL; |
1840 | bool ret = false; | |
a73105b8 | 1841 | |
a513088d | 1842 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
1843 | if (!tt_local_entry) |
1844 | goto out; | |
058d0e26 | 1845 | /* Check if the client has been logically deleted (but is kept for |
9cfc7bd6 SE |
1846 | * consistency purpose) |
1847 | */ | |
acd34afa | 1848 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) |
058d0e26 | 1849 | goto out; |
7683fdc1 AQ |
1850 | ret = true; |
1851 | out: | |
a73105b8 | 1852 | if (tt_local_entry) |
a513088d | 1853 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7683fdc1 | 1854 | return ret; |
a73105b8 AQ |
1855 | } |
1856 | ||
08c36d3e SE |
1857 | void batadv_handle_tt_response(struct bat_priv *bat_priv, |
1858 | struct tt_query_packet *tt_response) | |
a73105b8 AQ |
1859 | { |
1860 | struct tt_req_node *node, *safe; | |
1861 | struct orig_node *orig_node = NULL; | |
1862 | ||
1eda58bf SE |
1863 | batadv_dbg(DBG_TT, bat_priv, |
1864 | "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", | |
1865 | tt_response->src, tt_response->ttvn, | |
1866 | ntohs(tt_response->tt_data), | |
acd34afa | 1867 | (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 | 1868 | |
20ff9d59 | 1869 | /* we should have never asked a backbone gw */ |
08adf151 | 1870 | if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src)) |
20ff9d59 SW |
1871 | goto out; |
1872 | ||
da641193 | 1873 | orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); |
a73105b8 AQ |
1874 | if (!orig_node) |
1875 | goto out; | |
1876 | ||
acd34afa | 1877 | if (tt_response->flags & BATADV_TT_FULL_TABLE) |
a513088d | 1878 | batadv_tt_fill_gtable(bat_priv, tt_response); |
a73105b8 | 1879 | else |
a513088d SE |
1880 | batadv_tt_update_changes(bat_priv, orig_node, |
1881 | ntohs(tt_response->tt_data), | |
1882 | tt_response->ttvn, | |
1883 | (struct tt_change *)(tt_response + 1)); | |
a73105b8 AQ |
1884 | |
1885 | /* Delete the tt_req_node from pending tt_requests list */ | |
1886 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1887 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
1eda58bf | 1888 | if (!batadv_compare_eth(node->addr, tt_response->src)) |
a73105b8 AQ |
1889 | continue; |
1890 | list_del(&node->list); | |
1891 | kfree(node); | |
1892 | } | |
1893 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1894 | ||
1895 | /* Recalculate the CRC for this orig_node and store it */ | |
a513088d | 1896 | orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); |
cc47f66e | 1897 | /* Roaming phase is over: tables are in sync again. I can |
9cfc7bd6 SE |
1898 | * unset the flag |
1899 | */ | |
cc47f66e | 1900 | orig_node->tt_poss_change = false; |
a73105b8 AQ |
1901 | out: |
1902 | if (orig_node) | |
7d211efc | 1903 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
1904 | } |
1905 | ||
08c36d3e | 1906 | int batadv_tt_init(struct bat_priv *bat_priv) |
a73105b8 | 1907 | { |
5346c35e | 1908 | int ret; |
a73105b8 | 1909 | |
a513088d | 1910 | ret = batadv_tt_local_init(bat_priv); |
5346c35e SE |
1911 | if (ret < 0) |
1912 | return ret; | |
1913 | ||
a513088d | 1914 | ret = batadv_tt_global_init(bat_priv); |
5346c35e SE |
1915 | if (ret < 0) |
1916 | return ret; | |
a73105b8 | 1917 | |
a513088d | 1918 | batadv_tt_start_timer(bat_priv); |
a73105b8 AQ |
1919 | |
1920 | return 1; | |
1921 | } | |
1922 | ||
a513088d | 1923 | static void batadv_tt_roam_list_free(struct bat_priv *bat_priv) |
a73105b8 | 1924 | { |
cc47f66e | 1925 | struct tt_roam_node *node, *safe; |
a73105b8 | 1926 | |
cc47f66e | 1927 | spin_lock_bh(&bat_priv->tt_roam_list_lock); |
a73105b8 | 1928 | |
cc47f66e AQ |
1929 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { |
1930 | list_del(&node->list); | |
1931 | kfree(node); | |
1932 | } | |
1933 | ||
1934 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1935 | } | |
1936 | ||
a513088d | 1937 | static void batadv_tt_roam_purge(struct bat_priv *bat_priv) |
cc47f66e AQ |
1938 | { |
1939 | struct tt_roam_node *node, *safe; | |
1940 | ||
1941 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1942 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { | |
42d0b044 SE |
1943 | if (!batadv_has_timed_out(node->first_time, |
1944 | BATADV_ROAMING_MAX_TIME)) | |
cc47f66e AQ |
1945 | continue; |
1946 | ||
1947 | list_del(&node->list); | |
1948 | kfree(node); | |
1949 | } | |
1950 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1951 | } | |
1952 | ||
1953 | /* This function checks whether the client already reached the | |
1954 | * maximum number of possible roaming phases. In this case the ROAMING_ADV | |
1955 | * will not be sent. | |
1956 | * | |
9cfc7bd6 SE |
1957 | * returns true if the ROAMING_ADV can be sent, false otherwise |
1958 | */ | |
a513088d SE |
1959 | static bool batadv_tt_check_roam_count(struct bat_priv *bat_priv, |
1960 | uint8_t *client) | |
cc47f66e AQ |
1961 | { |
1962 | struct tt_roam_node *tt_roam_node; | |
1963 | bool ret = false; | |
1964 | ||
1965 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1966 | /* The new tt_req will be issued only if I'm not waiting for a | |
9cfc7bd6 SE |
1967 | * reply from the same orig_node yet |
1968 | */ | |
cc47f66e | 1969 | list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) { |
1eda58bf | 1970 | if (!batadv_compare_eth(tt_roam_node->addr, client)) |
cc47f66e AQ |
1971 | continue; |
1972 | ||
1eda58bf | 1973 | if (batadv_has_timed_out(tt_roam_node->first_time, |
42d0b044 | 1974 | BATADV_ROAMING_MAX_TIME)) |
cc47f66e AQ |
1975 | continue; |
1976 | ||
3e34819e | 1977 | if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter)) |
cc47f66e AQ |
1978 | /* Sorry, you roamed too many times! */ |
1979 | goto unlock; | |
1980 | ret = true; | |
1981 | break; | |
1982 | } | |
1983 | ||
1984 | if (!ret) { | |
1985 | tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); | |
1986 | if (!tt_roam_node) | |
1987 | goto unlock; | |
1988 | ||
1989 | tt_roam_node->first_time = jiffies; | |
42d0b044 SE |
1990 | atomic_set(&tt_roam_node->counter, |
1991 | BATADV_ROAMING_MAX_COUNT - 1); | |
cc47f66e AQ |
1992 | memcpy(tt_roam_node->addr, client, ETH_ALEN); |
1993 | ||
1994 | list_add(&tt_roam_node->list, &bat_priv->tt_roam_list); | |
1995 | ret = true; | |
1996 | } | |
1997 | ||
1998 | unlock: | |
1999 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
2000 | return ret; | |
2001 | } | |
2002 | ||
a513088d SE |
2003 | static void batadv_send_roam_adv(struct bat_priv *bat_priv, uint8_t *client, |
2004 | struct orig_node *orig_node) | |
cc47f66e AQ |
2005 | { |
2006 | struct neigh_node *neigh_node = NULL; | |
2007 | struct sk_buff *skb = NULL; | |
2008 | struct roam_adv_packet *roam_adv_packet; | |
2009 | int ret = 1; | |
2010 | struct hard_iface *primary_if; | |
2011 | ||
2012 | /* before going on we have to check whether the client has | |
9cfc7bd6 SE |
2013 | * already roamed to us too many times |
2014 | */ | |
a513088d | 2015 | if (!batadv_tt_check_roam_count(bat_priv, client)) |
cc47f66e AQ |
2016 | goto out; |
2017 | ||
2018 | skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN); | |
2019 | if (!skb) | |
2020 | goto out; | |
2021 | ||
2022 | skb_reserve(skb, ETH_HLEN); | |
2023 | ||
2024 | roam_adv_packet = (struct roam_adv_packet *)skb_put(skb, | |
2025 | sizeof(struct roam_adv_packet)); | |
2026 | ||
acd34afa | 2027 | roam_adv_packet->header.packet_type = BATADV_ROAM_ADV; |
7e071c79 | 2028 | roam_adv_packet->header.version = BATADV_COMPAT_VERSION; |
42d0b044 | 2029 | roam_adv_packet->header.ttl = BATADV_TTL; |
e5d89254 | 2030 | primary_if = batadv_primary_if_get_selected(bat_priv); |
cc47f66e AQ |
2031 | if (!primary_if) |
2032 | goto out; | |
2033 | memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN); | |
e5d89254 | 2034 | batadv_hardif_free_ref(primary_if); |
cc47f66e AQ |
2035 | memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN); |
2036 | memcpy(roam_adv_packet->client, client, ETH_ALEN); | |
2037 | ||
7d211efc | 2038 | neigh_node = batadv_orig_node_get_router(orig_node); |
cc47f66e AQ |
2039 | if (!neigh_node) |
2040 | goto out; | |
2041 | ||
1eda58bf SE |
2042 | batadv_dbg(DBG_TT, bat_priv, |
2043 | "Sending ROAMING_ADV to %pM (client %pM) via %pM\n", | |
2044 | orig_node->orig, client, neigh_node->addr); | |
cc47f66e | 2045 | |
d69909d2 | 2046 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX); |
f8214865 | 2047 | |
9455e34c | 2048 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
cc47f66e AQ |
2049 | ret = 0; |
2050 | ||
2051 | out: | |
2052 | if (neigh_node) | |
7d211efc | 2053 | batadv_neigh_node_free_ref(neigh_node); |
cc47f66e AQ |
2054 | if (ret) |
2055 | kfree_skb(skb); | |
2056 | return; | |
a73105b8 AQ |
2057 | } |
2058 | ||
a513088d | 2059 | static void batadv_tt_purge(struct work_struct *work) |
a73105b8 AQ |
2060 | { |
2061 | struct delayed_work *delayed_work = | |
2062 | container_of(work, struct delayed_work, work); | |
2063 | struct bat_priv *bat_priv = | |
2064 | container_of(delayed_work, struct bat_priv, tt_work); | |
2065 | ||
a513088d SE |
2066 | batadv_tt_local_purge(bat_priv); |
2067 | batadv_tt_global_roam_purge(bat_priv); | |
2068 | batadv_tt_req_purge(bat_priv); | |
2069 | batadv_tt_roam_purge(bat_priv); | |
a73105b8 | 2070 | |
a513088d | 2071 | batadv_tt_start_timer(bat_priv); |
a73105b8 | 2072 | } |
cc47f66e | 2073 | |
08c36d3e | 2074 | void batadv_tt_free(struct bat_priv *bat_priv) |
cc47f66e AQ |
2075 | { |
2076 | cancel_delayed_work_sync(&bat_priv->tt_work); | |
2077 | ||
a513088d SE |
2078 | batadv_tt_local_table_free(bat_priv); |
2079 | batadv_tt_global_table_free(bat_priv); | |
2080 | batadv_tt_req_list_free(bat_priv); | |
2081 | batadv_tt_changes_list_free(bat_priv); | |
2082 | batadv_tt_roam_list_free(bat_priv); | |
cc47f66e AQ |
2083 | |
2084 | kfree(bat_priv->tt_buff); | |
2085 | } | |
058d0e26 | 2086 | |
697f2531 | 2087 | /* This function will enable or disable the specified flags for all the entries |
9cfc7bd6 SE |
2088 | * in the given hash table and returns the number of modified entries |
2089 | */ | |
a513088d SE |
2090 | static uint16_t batadv_tt_set_flags(struct hashtable_t *hash, uint16_t flags, |
2091 | bool enable) | |
058d0e26 | 2092 | { |
c90681b8 | 2093 | uint32_t i; |
697f2531 | 2094 | uint16_t changed_num = 0; |
058d0e26 AQ |
2095 | struct hlist_head *head; |
2096 | struct hlist_node *node; | |
48100bac | 2097 | struct tt_common_entry *tt_common_entry; |
058d0e26 AQ |
2098 | |
2099 | if (!hash) | |
697f2531 | 2100 | goto out; |
058d0e26 AQ |
2101 | |
2102 | for (i = 0; i < hash->size; i++) { | |
2103 | head = &hash->table[i]; | |
2104 | ||
2105 | rcu_read_lock(); | |
48100bac | 2106 | hlist_for_each_entry_rcu(tt_common_entry, node, |
058d0e26 | 2107 | head, hash_entry) { |
697f2531 AQ |
2108 | if (enable) { |
2109 | if ((tt_common_entry->flags & flags) == flags) | |
2110 | continue; | |
2111 | tt_common_entry->flags |= flags; | |
2112 | } else { | |
2113 | if (!(tt_common_entry->flags & flags)) | |
2114 | continue; | |
2115 | tt_common_entry->flags &= ~flags; | |
2116 | } | |
2117 | changed_num++; | |
058d0e26 AQ |
2118 | } |
2119 | rcu_read_unlock(); | |
2120 | } | |
697f2531 AQ |
2121 | out: |
2122 | return changed_num; | |
058d0e26 AQ |
2123 | } |
2124 | ||
acd34afa | 2125 | /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */ |
a513088d | 2126 | static void batadv_tt_local_purge_pending_clients(struct bat_priv *bat_priv) |
058d0e26 AQ |
2127 | { |
2128 | struct hashtable_t *hash = bat_priv->tt_local_hash; | |
acd34afa | 2129 | struct tt_common_entry *tt_common; |
058d0e26 AQ |
2130 | struct tt_local_entry *tt_local_entry; |
2131 | struct hlist_node *node, *node_tmp; | |
2132 | struct hlist_head *head; | |
2133 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
c90681b8 | 2134 | uint32_t i; |
058d0e26 AQ |
2135 | |
2136 | if (!hash) | |
2137 | return; | |
2138 | ||
2139 | for (i = 0; i < hash->size; i++) { | |
2140 | head = &hash->table[i]; | |
2141 | list_lock = &hash->list_locks[i]; | |
2142 | ||
2143 | spin_lock_bh(list_lock); | |
acd34afa SE |
2144 | hlist_for_each_entry_safe(tt_common, node, node_tmp, head, |
2145 | hash_entry) { | |
2146 | if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING)) | |
058d0e26 AQ |
2147 | continue; |
2148 | ||
1eda58bf SE |
2149 | batadv_dbg(DBG_TT, bat_priv, |
2150 | "Deleting local tt entry (%pM): pending\n", | |
acd34afa | 2151 | tt_common->addr); |
058d0e26 AQ |
2152 | |
2153 | atomic_dec(&bat_priv->num_local_tt); | |
2154 | hlist_del_rcu(node); | |
acd34afa | 2155 | tt_local_entry = container_of(tt_common, |
48100bac AQ |
2156 | struct tt_local_entry, |
2157 | common); | |
a513088d | 2158 | batadv_tt_local_entry_free_ref(tt_local_entry); |
058d0e26 AQ |
2159 | } |
2160 | spin_unlock_bh(list_lock); | |
2161 | } | |
2162 | ||
2163 | } | |
2164 | ||
a513088d SE |
2165 | static int batadv_tt_commit_changes(struct bat_priv *bat_priv, |
2166 | unsigned char **packet_buff, | |
2167 | int *packet_buff_len, int packet_min_len) | |
058d0e26 | 2168 | { |
be9aa4c1 ML |
2169 | uint16_t changed_num = 0; |
2170 | ||
2171 | if (atomic_read(&bat_priv->tt_local_changes) < 1) | |
2172 | return -ENOENT; | |
2173 | ||
a513088d | 2174 | changed_num = batadv_tt_set_flags(bat_priv->tt_local_hash, |
acd34afa | 2175 | BATADV_TT_CLIENT_NEW, false); |
be9aa4c1 ML |
2176 | |
2177 | /* all reset entries have to be counted as local entries */ | |
697f2531 | 2178 | atomic_add(changed_num, &bat_priv->num_local_tt); |
a513088d | 2179 | batadv_tt_local_purge_pending_clients(bat_priv); |
be9aa4c1 | 2180 | bat_priv->tt_crc = batadv_tt_local_crc(bat_priv); |
058d0e26 AQ |
2181 | |
2182 | /* Increment the TTVN only once per OGM interval */ | |
2183 | atomic_inc(&bat_priv->ttvn); | |
1eda58bf SE |
2184 | batadv_dbg(DBG_TT, bat_priv, |
2185 | "Local changes committed, updating to ttvn %u\n", | |
2186 | (uint8_t)atomic_read(&bat_priv->ttvn)); | |
058d0e26 | 2187 | bat_priv->tt_poss_change = false; |
be9aa4c1 ML |
2188 | |
2189 | /* reset the sending counter */ | |
42d0b044 | 2190 | atomic_set(&bat_priv->tt_ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX); |
be9aa4c1 | 2191 | |
a513088d SE |
2192 | return batadv_tt_changes_fill_buff(bat_priv, packet_buff, |
2193 | packet_buff_len, packet_min_len); | |
be9aa4c1 ML |
2194 | } |
2195 | ||
2196 | /* when calling this function (hard_iface == primary_if) has to be true */ | |
2197 | int batadv_tt_append_diff(struct bat_priv *bat_priv, | |
2198 | unsigned char **packet_buff, int *packet_buff_len, | |
2199 | int packet_min_len) | |
2200 | { | |
2201 | int tt_num_changes; | |
2202 | ||
2203 | /* if at least one change happened */ | |
a513088d SE |
2204 | tt_num_changes = batadv_tt_commit_changes(bat_priv, packet_buff, |
2205 | packet_buff_len, | |
2206 | packet_min_len); | |
be9aa4c1 ML |
2207 | |
2208 | /* if the changes have been sent often enough */ | |
2209 | if ((tt_num_changes < 0) && | |
3e34819e | 2210 | (!batadv_atomic_dec_not_zero(&bat_priv->tt_ogm_append_cnt))) { |
a513088d SE |
2211 | batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, |
2212 | packet_min_len, packet_min_len); | |
be9aa4c1 ML |
2213 | tt_num_changes = 0; |
2214 | } | |
2215 | ||
2216 | return tt_num_changes; | |
058d0e26 | 2217 | } |
59b699cd | 2218 | |
08c36d3e SE |
2219 | bool batadv_is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, |
2220 | uint8_t *dst) | |
59b699cd AQ |
2221 | { |
2222 | struct tt_local_entry *tt_local_entry = NULL; | |
2223 | struct tt_global_entry *tt_global_entry = NULL; | |
5870adc6 | 2224 | bool ret = false; |
59b699cd AQ |
2225 | |
2226 | if (!atomic_read(&bat_priv->ap_isolation)) | |
5870adc6 | 2227 | goto out; |
59b699cd | 2228 | |
a513088d | 2229 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst); |
59b699cd AQ |
2230 | if (!tt_local_entry) |
2231 | goto out; | |
2232 | ||
a513088d | 2233 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, src); |
59b699cd AQ |
2234 | if (!tt_global_entry) |
2235 | goto out; | |
2236 | ||
1f129fef | 2237 | if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) |
59b699cd AQ |
2238 | goto out; |
2239 | ||
5870adc6 | 2240 | ret = true; |
59b699cd AQ |
2241 | |
2242 | out: | |
2243 | if (tt_global_entry) | |
a513088d | 2244 | batadv_tt_global_entry_free_ref(tt_global_entry); |
59b699cd | 2245 | if (tt_local_entry) |
a513088d | 2246 | batadv_tt_local_entry_free_ref(tt_local_entry); |
59b699cd AQ |
2247 | return ret; |
2248 | } | |
a943cac1 | 2249 | |
08c36d3e SE |
2250 | void batadv_tt_update_orig(struct bat_priv *bat_priv, |
2251 | struct orig_node *orig_node, | |
2252 | const unsigned char *tt_buff, uint8_t tt_num_changes, | |
2253 | uint8_t ttvn, uint16_t tt_crc) | |
a943cac1 ML |
2254 | { |
2255 | uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
2256 | bool full_table = true; | |
2257 | ||
20ff9d59 | 2258 | /* don't care about a backbone gateways updates. */ |
08adf151 | 2259 | if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) |
20ff9d59 SW |
2260 | return; |
2261 | ||
17071578 | 2262 | /* orig table not initialised AND first diff is in the OGM OR the ttvn |
9cfc7bd6 SE |
2263 | * increased by one -> we can apply the attached changes |
2264 | */ | |
17071578 AQ |
2265 | if ((!orig_node->tt_initialised && ttvn == 1) || |
2266 | ttvn - orig_ttvn == 1) { | |
a943cac1 | 2267 | /* the OGM could not contain the changes due to their size or |
42d0b044 SE |
2268 | * because they have already been sent BATADV_TT_OGM_APPEND_MAX |
2269 | * times. | |
9cfc7bd6 SE |
2270 | * In this case send a tt request |
2271 | */ | |
a943cac1 ML |
2272 | if (!tt_num_changes) { |
2273 | full_table = false; | |
2274 | goto request_table; | |
2275 | } | |
2276 | ||
a513088d SE |
2277 | batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes, |
2278 | ttvn, (struct tt_change *)tt_buff); | |
a943cac1 ML |
2279 | |
2280 | /* Even if we received the precomputed crc with the OGM, we | |
2281 | * prefer to recompute it to spot any possible inconsistency | |
9cfc7bd6 SE |
2282 | * in the global table |
2283 | */ | |
a513088d | 2284 | orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); |
a943cac1 ML |
2285 | |
2286 | /* The ttvn alone is not enough to guarantee consistency | |
2287 | * because a single value could represent different states | |
2288 | * (due to the wrap around). Thus a node has to check whether | |
2289 | * the resulting table (after applying the changes) is still | |
2290 | * consistent or not. E.g. a node could disconnect while its | |
2291 | * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case | |
2292 | * checking the CRC value is mandatory to detect the | |
9cfc7bd6 SE |
2293 | * inconsistency |
2294 | */ | |
a943cac1 ML |
2295 | if (orig_node->tt_crc != tt_crc) |
2296 | goto request_table; | |
2297 | ||
2298 | /* Roaming phase is over: tables are in sync again. I can | |
9cfc7bd6 SE |
2299 | * unset the flag |
2300 | */ | |
a943cac1 ML |
2301 | orig_node->tt_poss_change = false; |
2302 | } else { | |
2303 | /* if we missed more than one change or our tables are not | |
9cfc7bd6 SE |
2304 | * in sync anymore -> request fresh tt data |
2305 | */ | |
17071578 AQ |
2306 | if (!orig_node->tt_initialised || ttvn != orig_ttvn || |
2307 | orig_node->tt_crc != tt_crc) { | |
a943cac1 | 2308 | request_table: |
1eda58bf SE |
2309 | batadv_dbg(DBG_TT, bat_priv, |
2310 | "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n", | |
2311 | orig_node->orig, ttvn, orig_ttvn, tt_crc, | |
2312 | orig_node->tt_crc, tt_num_changes); | |
a513088d SE |
2313 | batadv_send_tt_request(bat_priv, orig_node, ttvn, |
2314 | tt_crc, full_table); | |
a943cac1 ML |
2315 | return; |
2316 | } | |
2317 | } | |
2318 | } | |
3275e7cc AQ |
2319 | |
2320 | /* returns true whether we know that the client has moved from its old | |
2321 | * originator to another one. This entry is kept is still kept for consistency | |
2322 | * purposes | |
2323 | */ | |
08c36d3e SE |
2324 | bool batadv_tt_global_client_is_roaming(struct bat_priv *bat_priv, |
2325 | uint8_t *addr) | |
3275e7cc AQ |
2326 | { |
2327 | struct tt_global_entry *tt_global_entry; | |
2328 | bool ret = false; | |
2329 | ||
a513088d | 2330 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
3275e7cc AQ |
2331 | if (!tt_global_entry) |
2332 | goto out; | |
2333 | ||
acd34afa | 2334 | ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM; |
a513088d | 2335 | batadv_tt_global_entry_free_ref(tt_global_entry); |
3275e7cc AQ |
2336 | out: |
2337 | return ret; | |
2338 | } |