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0b873931 | 1 | /* Copyright (C) 2007-2013 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 | |
ced72933 | 30 | #include <linux/crc32c.h> |
a73105b8 | 31 | |
dec05074 AQ |
32 | /* hash class keys */ |
33 | static struct lock_class_key batadv_tt_local_hash_lock_class_key; | |
34 | static struct lock_class_key batadv_tt_global_hash_lock_class_key; | |
35 | ||
56303d34 SE |
36 | static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, |
37 | struct batadv_orig_node *orig_node); | |
a513088d SE |
38 | static void batadv_tt_purge(struct work_struct *work); |
39 | static void | |
56303d34 | 40 | batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry); |
30cfd02b AQ |
41 | static void batadv_tt_global_del(struct batadv_priv *bat_priv, |
42 | struct batadv_orig_node *orig_node, | |
43 | const unsigned char *addr, | |
44 | const char *message, bool roaming); | |
c6c8fea2 | 45 | |
7aadf889 | 46 | /* returns 1 if they are the same mac addr */ |
a513088d | 47 | static int batadv_compare_tt(const struct hlist_node *node, const void *data2) |
7aadf889 | 48 | { |
56303d34 | 49 | const void *data1 = container_of(node, struct batadv_tt_common_entry, |
747e4221 | 50 | hash_entry); |
7aadf889 ML |
51 | |
52 | return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); | |
53 | } | |
54 | ||
56303d34 | 55 | static struct batadv_tt_common_entry * |
5bf74e9c | 56 | batadv_tt_hash_find(struct batadv_hashtable *hash, const void *data) |
7aadf889 | 57 | { |
7aadf889 | 58 | struct hlist_head *head; |
56303d34 SE |
59 | struct batadv_tt_common_entry *tt_common_entry; |
60 | struct batadv_tt_common_entry *tt_common_entry_tmp = NULL; | |
c90681b8 | 61 | uint32_t index; |
7aadf889 ML |
62 | |
63 | if (!hash) | |
64 | return NULL; | |
65 | ||
da641193 | 66 | index = batadv_choose_orig(data, hash->size); |
7aadf889 ML |
67 | head = &hash->table[index]; |
68 | ||
69 | rcu_read_lock(); | |
b67bfe0d | 70 | hlist_for_each_entry_rcu(tt_common_entry, head, hash_entry) { |
1eda58bf | 71 | if (!batadv_compare_eth(tt_common_entry, data)) |
7aadf889 ML |
72 | continue; |
73 | ||
48100bac | 74 | if (!atomic_inc_not_zero(&tt_common_entry->refcount)) |
7683fdc1 AQ |
75 | continue; |
76 | ||
48100bac | 77 | tt_common_entry_tmp = tt_common_entry; |
7aadf889 ML |
78 | break; |
79 | } | |
80 | rcu_read_unlock(); | |
81 | ||
48100bac | 82 | return tt_common_entry_tmp; |
7aadf889 ML |
83 | } |
84 | ||
56303d34 SE |
85 | static struct batadv_tt_local_entry * |
86 | batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const void *data) | |
7aadf889 | 87 | { |
56303d34 SE |
88 | struct batadv_tt_common_entry *tt_common_entry; |
89 | struct batadv_tt_local_entry *tt_local_entry = NULL; | |
7aadf889 | 90 | |
807736f6 | 91 | tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, data); |
48100bac AQ |
92 | if (tt_common_entry) |
93 | tt_local_entry = container_of(tt_common_entry, | |
56303d34 SE |
94 | struct batadv_tt_local_entry, |
95 | common); | |
48100bac AQ |
96 | return tt_local_entry; |
97 | } | |
7aadf889 | 98 | |
56303d34 SE |
99 | static struct batadv_tt_global_entry * |
100 | batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const void *data) | |
48100bac | 101 | { |
56303d34 SE |
102 | struct batadv_tt_common_entry *tt_common_entry; |
103 | struct batadv_tt_global_entry *tt_global_entry = NULL; | |
7683fdc1 | 104 | |
807736f6 | 105 | tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, data); |
48100bac AQ |
106 | if (tt_common_entry) |
107 | tt_global_entry = container_of(tt_common_entry, | |
56303d34 SE |
108 | struct batadv_tt_global_entry, |
109 | common); | |
48100bac | 110 | return tt_global_entry; |
7aadf889 ML |
111 | } |
112 | ||
a513088d | 113 | static void |
56303d34 | 114 | batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry) |
7683fdc1 | 115 | { |
48100bac AQ |
116 | if (atomic_dec_and_test(&tt_local_entry->common.refcount)) |
117 | kfree_rcu(tt_local_entry, common.rcu); | |
7683fdc1 AQ |
118 | } |
119 | ||
a513088d | 120 | static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu) |
531027fc | 121 | { |
56303d34 SE |
122 | struct batadv_tt_common_entry *tt_common_entry; |
123 | struct batadv_tt_global_entry *tt_global_entry; | |
531027fc | 124 | |
56303d34 SE |
125 | tt_common_entry = container_of(rcu, struct batadv_tt_common_entry, rcu); |
126 | tt_global_entry = container_of(tt_common_entry, | |
127 | struct batadv_tt_global_entry, common); | |
531027fc | 128 | |
531027fc SW |
129 | kfree(tt_global_entry); |
130 | } | |
131 | ||
a513088d | 132 | static void |
56303d34 | 133 | batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry) |
7683fdc1 | 134 | { |
db08e6e5 | 135 | if (atomic_dec_and_test(&tt_global_entry->common.refcount)) { |
a513088d | 136 | batadv_tt_global_del_orig_list(tt_global_entry); |
48100bac | 137 | call_rcu(&tt_global_entry->common.rcu, |
a513088d | 138 | batadv_tt_global_entry_free_rcu); |
db08e6e5 SW |
139 | } |
140 | } | |
141 | ||
a513088d | 142 | static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu) |
db08e6e5 | 143 | { |
56303d34 | 144 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 | 145 | |
56303d34 | 146 | orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu); |
72822225 LL |
147 | |
148 | /* We are in an rcu callback here, therefore we cannot use | |
149 | * batadv_orig_node_free_ref() and its call_rcu(): | |
150 | * An rcu_barrier() wouldn't wait for that to finish | |
151 | */ | |
152 | batadv_orig_node_free_ref_now(orig_entry->orig_node); | |
db08e6e5 SW |
153 | kfree(orig_entry); |
154 | } | |
155 | ||
a513088d | 156 | static void |
56303d34 | 157 | batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry) |
db08e6e5 | 158 | { |
d657e621 AQ |
159 | if (!atomic_dec_and_test(&orig_entry->refcount)) |
160 | return; | |
29cb99de AQ |
161 | /* to avoid race conditions, immediately decrease the tt counter */ |
162 | atomic_dec(&orig_entry->orig_node->tt_size); | |
a513088d | 163 | call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu); |
7683fdc1 AQ |
164 | } |
165 | ||
3abe4adb AQ |
166 | /** |
167 | * batadv_tt_local_event - store a local TT event (ADD/DEL) | |
168 | * @bat_priv: the bat priv with all the soft interface information | |
169 | * @tt_local_entry: the TT entry involved in the event | |
170 | * @event_flags: flags to store in the event structure | |
171 | */ | |
56303d34 | 172 | static void batadv_tt_local_event(struct batadv_priv *bat_priv, |
3abe4adb AQ |
173 | struct batadv_tt_local_entry *tt_local_entry, |
174 | uint8_t event_flags) | |
a73105b8 | 175 | { |
56303d34 | 176 | struct batadv_tt_change_node *tt_change_node, *entry, *safe; |
3abe4adb AQ |
177 | struct batadv_tt_common_entry *common = &tt_local_entry->common; |
178 | uint8_t flags = common->flags | event_flags; | |
3b643de5 AQ |
179 | bool event_removed = false; |
180 | bool del_op_requested, del_op_entry; | |
a73105b8 AQ |
181 | |
182 | tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC); | |
a73105b8 AQ |
183 | if (!tt_change_node) |
184 | return; | |
185 | ||
ff66c975 | 186 | tt_change_node->change.flags = flags; |
e1bf0c14 | 187 | tt_change_node->change.reserved = 0; |
3abe4adb | 188 | memcpy(tt_change_node->change.addr, common->addr, ETH_ALEN); |
a73105b8 | 189 | |
acd34afa | 190 | del_op_requested = flags & BATADV_TT_CLIENT_DEL; |
3b643de5 AQ |
191 | |
192 | /* check for ADD+DEL or DEL+ADD events */ | |
807736f6 SE |
193 | spin_lock_bh(&bat_priv->tt.changes_list_lock); |
194 | list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, | |
3b643de5 | 195 | list) { |
3abe4adb | 196 | if (!batadv_compare_eth(entry->change.addr, common->addr)) |
3b643de5 AQ |
197 | continue; |
198 | ||
199 | /* DEL+ADD in the same orig interval have no effect and can be | |
200 | * removed to avoid silly behaviour on the receiver side. The | |
201 | * other way around (ADD+DEL) can happen in case of roaming of | |
202 | * a client still in the NEW state. Roaming of NEW clients is | |
203 | * now possible due to automatically recognition of "temporary" | |
204 | * clients | |
205 | */ | |
acd34afa | 206 | del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL; |
3b643de5 AQ |
207 | if (!del_op_requested && del_op_entry) |
208 | goto del; | |
209 | if (del_op_requested && !del_op_entry) | |
210 | goto del; | |
211 | continue; | |
212 | del: | |
213 | list_del(&entry->list); | |
214 | kfree(entry); | |
155e4e12 | 215 | kfree(tt_change_node); |
3b643de5 AQ |
216 | event_removed = true; |
217 | goto unlock; | |
218 | } | |
219 | ||
a73105b8 | 220 | /* track the change in the OGMinterval list */ |
807736f6 | 221 | list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list); |
3b643de5 AQ |
222 | |
223 | unlock: | |
807736f6 | 224 | spin_unlock_bh(&bat_priv->tt.changes_list_lock); |
a73105b8 | 225 | |
3b643de5 | 226 | if (event_removed) |
807736f6 | 227 | atomic_dec(&bat_priv->tt.local_changes); |
3b643de5 | 228 | else |
807736f6 | 229 | atomic_inc(&bat_priv->tt.local_changes); |
a73105b8 AQ |
230 | } |
231 | ||
335fbe0f ML |
232 | /** |
233 | * batadv_tt_len - compute length in bytes of given number of tt changes | |
234 | * @changes_num: number of tt changes | |
235 | * | |
236 | * Returns computed length in bytes. | |
237 | */ | |
238 | static int batadv_tt_len(int changes_num) | |
a73105b8 | 239 | { |
335fbe0f | 240 | return changes_num * sizeof(struct batadv_tvlv_tt_change); |
a73105b8 AQ |
241 | } |
242 | ||
56303d34 | 243 | static int batadv_tt_local_init(struct batadv_priv *bat_priv) |
c6c8fea2 | 244 | { |
807736f6 | 245 | if (bat_priv->tt.local_hash) |
5346c35e | 246 | return 0; |
c6c8fea2 | 247 | |
807736f6 | 248 | bat_priv->tt.local_hash = batadv_hash_new(1024); |
c6c8fea2 | 249 | |
807736f6 | 250 | if (!bat_priv->tt.local_hash) |
5346c35e | 251 | return -ENOMEM; |
c6c8fea2 | 252 | |
dec05074 AQ |
253 | batadv_hash_set_lock_class(bat_priv->tt.local_hash, |
254 | &batadv_tt_local_hash_lock_class_key); | |
255 | ||
5346c35e | 256 | return 0; |
c6c8fea2 SE |
257 | } |
258 | ||
068ee6e2 AQ |
259 | static void batadv_tt_global_free(struct batadv_priv *bat_priv, |
260 | struct batadv_tt_global_entry *tt_global, | |
261 | const char *message) | |
262 | { | |
263 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
264 | "Deleting global tt entry %pM: %s\n", | |
265 | tt_global->common.addr, message); | |
266 | ||
267 | batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt, | |
268 | batadv_choose_orig, tt_global->common.addr); | |
269 | batadv_tt_global_entry_free_ref(tt_global); | |
068ee6e2 AQ |
270 | } |
271 | ||
08c36d3e SE |
272 | void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, |
273 | int ifindex) | |
c6c8fea2 | 274 | { |
56303d34 | 275 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
170173bf SE |
276 | struct batadv_tt_local_entry *tt_local; |
277 | struct batadv_tt_global_entry *tt_global; | |
db08e6e5 | 278 | struct hlist_head *head; |
56303d34 | 279 | struct batadv_tt_orig_list_entry *orig_entry; |
80b3f58c | 280 | int hash_added; |
068ee6e2 | 281 | bool roamed_back = false; |
c6c8fea2 | 282 | |
47c94655 | 283 | tt_local = batadv_tt_local_hash_find(bat_priv, addr); |
068ee6e2 | 284 | tt_global = batadv_tt_global_hash_find(bat_priv, addr); |
c6c8fea2 | 285 | |
47c94655 AQ |
286 | if (tt_local) { |
287 | tt_local->last_seen = jiffies; | |
068ee6e2 AQ |
288 | if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) { |
289 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
290 | "Re-adding pending client %pM\n", addr); | |
291 | /* whatever the reason why the PENDING flag was set, | |
292 | * this is a client which was enqueued to be removed in | |
293 | * this orig_interval. Since it popped up again, the | |
294 | * flag can be reset like it was never enqueued | |
295 | */ | |
296 | tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING; | |
297 | goto add_event; | |
298 | } | |
299 | ||
300 | if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) { | |
301 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
302 | "Roaming client %pM came back to its original location\n", | |
303 | addr); | |
304 | /* the ROAM flag is set because this client roamed away | |
305 | * and the node got a roaming_advertisement message. Now | |
306 | * that the client popped up again at its original | |
307 | * location such flag can be unset | |
308 | */ | |
309 | tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM; | |
310 | roamed_back = true; | |
311 | } | |
312 | goto check_roaming; | |
c6c8fea2 SE |
313 | } |
314 | ||
47c94655 AQ |
315 | tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC); |
316 | if (!tt_local) | |
7683fdc1 | 317 | goto out; |
a73105b8 | 318 | |
39c75a51 | 319 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 320 | "Creating new local tt entry: %pM (ttvn: %d)\n", addr, |
807736f6 | 321 | (uint8_t)atomic_read(&bat_priv->tt.vn)); |
c6c8fea2 | 322 | |
47c94655 | 323 | memcpy(tt_local->common.addr, addr, ETH_ALEN); |
8425ec6a AQ |
324 | /* The local entry has to be marked as NEW to avoid to send it in |
325 | * a full table response going out before the next ttvn increment | |
326 | * (consistency check) | |
327 | */ | |
328 | tt_local->common.flags = BATADV_TT_CLIENT_NEW; | |
9563877e | 329 | if (batadv_is_wifi_iface(ifindex)) |
47c94655 AQ |
330 | tt_local->common.flags |= BATADV_TT_CLIENT_WIFI; |
331 | atomic_set(&tt_local->common.refcount, 2); | |
332 | tt_local->last_seen = jiffies; | |
333 | tt_local->common.added_at = tt_local->last_seen; | |
c6c8fea2 SE |
334 | |
335 | /* the batman interface mac address should never be purged */ | |
1eda58bf | 336 | if (batadv_compare_eth(addr, soft_iface->dev_addr)) |
47c94655 | 337 | tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE; |
c6c8fea2 | 338 | |
807736f6 | 339 | hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt, |
47c94655 AQ |
340 | batadv_choose_orig, &tt_local->common, |
341 | &tt_local->common.hash_entry); | |
80b3f58c SW |
342 | |
343 | if (unlikely(hash_added != 0)) { | |
344 | /* remove the reference for the hash */ | |
47c94655 | 345 | batadv_tt_local_entry_free_ref(tt_local); |
80b3f58c SW |
346 | goto out; |
347 | } | |
348 | ||
068ee6e2 | 349 | add_event: |
3abe4adb | 350 | batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS); |
ff66c975 | 351 | |
068ee6e2 AQ |
352 | check_roaming: |
353 | /* Check whether it is a roaming, but don't do anything if the roaming | |
354 | * process has already been handled | |
355 | */ | |
356 | if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) { | |
db08e6e5 | 357 | /* These node are probably going to update their tt table */ |
47c94655 | 358 | head = &tt_global->orig_list; |
db08e6e5 | 359 | rcu_read_lock(); |
b67bfe0d | 360 | hlist_for_each_entry_rcu(orig_entry, head, list) { |
47c94655 | 361 | batadv_send_roam_adv(bat_priv, tt_global->common.addr, |
a513088d | 362 | orig_entry->orig_node); |
db08e6e5 SW |
363 | } |
364 | rcu_read_unlock(); | |
068ee6e2 AQ |
365 | if (roamed_back) { |
366 | batadv_tt_global_free(bat_priv, tt_global, | |
367 | "Roaming canceled"); | |
368 | tt_global = NULL; | |
369 | } else { | |
370 | /* The global entry has to be marked as ROAMING and | |
371 | * has to be kept for consistency purpose | |
372 | */ | |
373 | tt_global->common.flags |= BATADV_TT_CLIENT_ROAM; | |
374 | tt_global->roam_at = jiffies; | |
375 | } | |
7683fdc1 | 376 | } |
068ee6e2 | 377 | |
7683fdc1 | 378 | out: |
47c94655 AQ |
379 | if (tt_local) |
380 | batadv_tt_local_entry_free_ref(tt_local); | |
381 | if (tt_global) | |
382 | batadv_tt_global_entry_free_ref(tt_global); | |
c6c8fea2 SE |
383 | } |
384 | ||
e1bf0c14 ML |
385 | /** |
386 | * batadv_tt_tvlv_container_update - update the translation table tvlv container | |
387 | * after local tt changes have been committed | |
388 | * @bat_priv: the bat priv with all the soft interface information | |
389 | */ | |
390 | static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv) | |
be9aa4c1 | 391 | { |
e1bf0c14 ML |
392 | struct batadv_tt_change_node *entry, *safe; |
393 | struct batadv_tvlv_tt_data *tt_data; | |
394 | struct batadv_tvlv_tt_change *tt_change; | |
395 | int tt_diff_len = 0, tt_change_len = 0; | |
396 | int tt_diff_entries_num = 0, tt_diff_entries_count = 0; | |
be9aa4c1 | 397 | |
e1bf0c14 | 398 | tt_diff_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes)); |
be9aa4c1 ML |
399 | |
400 | /* if we have too many changes for one packet don't send any | |
401 | * and wait for the tt table request which will be fragmented | |
402 | */ | |
e1bf0c14 ML |
403 | if (tt_diff_len > bat_priv->soft_iface->mtu) |
404 | tt_diff_len = 0; | |
be9aa4c1 | 405 | |
e1bf0c14 ML |
406 | tt_data = kzalloc(sizeof(*tt_data) + tt_diff_len, GFP_ATOMIC); |
407 | if (!tt_data) | |
408 | return; | |
be9aa4c1 | 409 | |
e1bf0c14 ML |
410 | tt_data->flags = BATADV_TT_OGM_DIFF; |
411 | tt_data->ttvn = atomic_read(&bat_priv->tt.vn); | |
ced72933 | 412 | tt_data->crc = htonl(bat_priv->tt.local_crc); |
c6c8fea2 | 413 | |
e1bf0c14 ML |
414 | if (tt_diff_len == 0) |
415 | goto container_register; | |
be9aa4c1 | 416 | |
e1bf0c14 | 417 | tt_diff_entries_num = tt_diff_len / batadv_tt_len(1); |
c6c8fea2 | 418 | |
807736f6 SE |
419 | spin_lock_bh(&bat_priv->tt.changes_list_lock); |
420 | atomic_set(&bat_priv->tt.local_changes, 0); | |
c6c8fea2 | 421 | |
e1bf0c14 ML |
422 | tt_change = (struct batadv_tvlv_tt_change *)(tt_data + 1); |
423 | ||
807736f6 | 424 | list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, |
7c64fd98 | 425 | list) { |
e1bf0c14 ML |
426 | if (tt_diff_entries_count < tt_diff_entries_num) { |
427 | memcpy(tt_change + tt_diff_entries_count, | |
428 | &entry->change, | |
429 | sizeof(struct batadv_tvlv_tt_change)); | |
430 | tt_diff_entries_count++; | |
c6c8fea2 | 431 | } |
a73105b8 AQ |
432 | list_del(&entry->list); |
433 | kfree(entry); | |
c6c8fea2 | 434 | } |
807736f6 | 435 | spin_unlock_bh(&bat_priv->tt.changes_list_lock); |
a73105b8 AQ |
436 | |
437 | /* Keep the buffer for possible tt_request */ | |
807736f6 SE |
438 | spin_lock_bh(&bat_priv->tt.last_changeset_lock); |
439 | kfree(bat_priv->tt.last_changeset); | |
440 | bat_priv->tt.last_changeset_len = 0; | |
441 | bat_priv->tt.last_changeset = NULL; | |
e1bf0c14 | 442 | tt_change_len = batadv_tt_len(tt_diff_entries_count); |
be9aa4c1 | 443 | /* check whether this new OGM has no changes due to size problems */ |
e1bf0c14 | 444 | if (tt_diff_entries_count > 0) { |
be9aa4c1 | 445 | /* if kmalloc() fails we will reply with the full table |
a73105b8 AQ |
446 | * instead of providing the diff |
447 | */ | |
e1bf0c14 | 448 | bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC); |
807736f6 | 449 | if (bat_priv->tt.last_changeset) { |
e1bf0c14 ML |
450 | memcpy(bat_priv->tt.last_changeset, |
451 | tt_change, tt_change_len); | |
452 | bat_priv->tt.last_changeset_len = tt_diff_len; | |
a73105b8 AQ |
453 | } |
454 | } | |
807736f6 | 455 | spin_unlock_bh(&bat_priv->tt.last_changeset_lock); |
c6c8fea2 | 456 | |
e1bf0c14 ML |
457 | container_register: |
458 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data, | |
459 | sizeof(*tt_data) + tt_change_len); | |
460 | kfree(tt_data); | |
c6c8fea2 SE |
461 | } |
462 | ||
08c36d3e | 463 | int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
464 | { |
465 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 466 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 467 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
56303d34 | 468 | struct batadv_tt_common_entry *tt_common_entry; |
85766a82 | 469 | struct batadv_tt_local_entry *tt_local; |
56303d34 | 470 | struct batadv_hard_iface *primary_if; |
c6c8fea2 | 471 | struct hlist_head *head; |
c90681b8 | 472 | uint32_t i; |
85766a82 AQ |
473 | int last_seen_secs; |
474 | int last_seen_msecs; | |
475 | unsigned long last_seen_jiffies; | |
476 | bool no_purge; | |
477 | uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE; | |
c6c8fea2 | 478 | |
30da63a6 ML |
479 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
480 | if (!primary_if) | |
32ae9b22 | 481 | goto out; |
c6c8fea2 | 482 | |
86ceb360 | 483 | seq_printf(seq, |
ced72933 | 484 | "Locally retrieved addresses (from %s) announced via TT (TTVN: %u CRC: %#.8x):\n", |
f9d8a537 AQ |
485 | net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn), |
486 | bat_priv->tt.local_crc); | |
85766a82 AQ |
487 | seq_printf(seq, " %-13s %-7s %-10s\n", "Client", "Flags", |
488 | "Last seen"); | |
c6c8fea2 | 489 | |
c6c8fea2 SE |
490 | for (i = 0; i < hash->size; i++) { |
491 | head = &hash->table[i]; | |
492 | ||
7aadf889 | 493 | rcu_read_lock(); |
b67bfe0d | 494 | hlist_for_each_entry_rcu(tt_common_entry, |
7aadf889 | 495 | head, hash_entry) { |
85766a82 AQ |
496 | tt_local = container_of(tt_common_entry, |
497 | struct batadv_tt_local_entry, | |
498 | common); | |
499 | last_seen_jiffies = jiffies - tt_local->last_seen; | |
500 | last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); | |
501 | last_seen_secs = last_seen_msecs / 1000; | |
502 | last_seen_msecs = last_seen_msecs % 1000; | |
503 | ||
504 | no_purge = tt_common_entry->flags & np_flag; | |
505 | ||
506 | seq_printf(seq, " * %pM [%c%c%c%c%c] %3u.%03u\n", | |
7c64fd98 SE |
507 | tt_common_entry->addr, |
508 | (tt_common_entry->flags & | |
acd34afa | 509 | BATADV_TT_CLIENT_ROAM ? 'R' : '.'), |
85766a82 | 510 | no_purge ? 'P' : '.', |
7c64fd98 | 511 | (tt_common_entry->flags & |
acd34afa | 512 | BATADV_TT_CLIENT_NEW ? 'N' : '.'), |
7c64fd98 | 513 | (tt_common_entry->flags & |
acd34afa | 514 | BATADV_TT_CLIENT_PENDING ? 'X' : '.'), |
7c64fd98 | 515 | (tt_common_entry->flags & |
85766a82 | 516 | BATADV_TT_CLIENT_WIFI ? 'W' : '.'), |
a7966d90 AQ |
517 | no_purge ? 0 : last_seen_secs, |
518 | no_purge ? 0 : last_seen_msecs); | |
c6c8fea2 | 519 | } |
7aadf889 | 520 | rcu_read_unlock(); |
c6c8fea2 | 521 | } |
32ae9b22 ML |
522 | out: |
523 | if (primary_if) | |
e5d89254 | 524 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 525 | return 0; |
c6c8fea2 SE |
526 | } |
527 | ||
56303d34 SE |
528 | static void |
529 | batadv_tt_local_set_pending(struct batadv_priv *bat_priv, | |
530 | struct batadv_tt_local_entry *tt_local_entry, | |
531 | uint16_t flags, const char *message) | |
c6c8fea2 | 532 | { |
3abe4adb | 533 | batadv_tt_local_event(bat_priv, tt_local_entry, flags); |
a73105b8 | 534 | |
015758d0 AQ |
535 | /* The local client has to be marked as "pending to be removed" but has |
536 | * to be kept in the table in order to send it in a full table | |
9cfc7bd6 SE |
537 | * response issued before the net ttvn increment (consistency check) |
538 | */ | |
acd34afa | 539 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING; |
c566dbbe | 540 | |
39c75a51 | 541 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
542 | "Local tt entry (%pM) pending to be removed: %s\n", |
543 | tt_local_entry->common.addr, message); | |
c6c8fea2 SE |
544 | } |
545 | ||
7f91d06c AQ |
546 | /** |
547 | * batadv_tt_local_remove - logically remove an entry from the local table | |
548 | * @bat_priv: the bat priv with all the soft interface information | |
549 | * @addr: the MAC address of the client to remove | |
550 | * @message: message to append to the log on deletion | |
551 | * @roaming: true if the deletion is due to a roaming event | |
552 | * | |
553 | * Returns the flags assigned to the local entry before being deleted | |
554 | */ | |
555 | uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv, | |
556 | const uint8_t *addr, const char *message, | |
557 | bool roaming) | |
c6c8fea2 | 558 | { |
170173bf | 559 | struct batadv_tt_local_entry *tt_local_entry; |
7f91d06c | 560 | uint16_t flags, curr_flags = BATADV_NO_FLAGS; |
c6c8fea2 | 561 | |
a513088d | 562 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
563 | if (!tt_local_entry) |
564 | goto out; | |
565 | ||
7f91d06c AQ |
566 | curr_flags = tt_local_entry->common.flags; |
567 | ||
acd34afa | 568 | flags = BATADV_TT_CLIENT_DEL; |
068ee6e2 AQ |
569 | /* if this global entry addition is due to a roaming, the node has to |
570 | * mark the local entry as "roamed" in order to correctly reroute | |
571 | * packets later | |
572 | */ | |
7c1fd91d | 573 | if (roaming) { |
acd34afa | 574 | flags |= BATADV_TT_CLIENT_ROAM; |
7c1fd91d AQ |
575 | /* mark the local client as ROAMed */ |
576 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM; | |
577 | } | |
42d0b044 | 578 | |
068ee6e2 AQ |
579 | if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) { |
580 | batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags, | |
581 | message); | |
582 | goto out; | |
583 | } | |
584 | /* if this client has been added right now, it is possible to | |
585 | * immediately purge it | |
586 | */ | |
3abe4adb | 587 | batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL); |
068ee6e2 AQ |
588 | hlist_del_rcu(&tt_local_entry->common.hash_entry); |
589 | batadv_tt_local_entry_free_ref(tt_local_entry); | |
7f91d06c | 590 | |
7683fdc1 AQ |
591 | out: |
592 | if (tt_local_entry) | |
a513088d | 593 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7f91d06c AQ |
594 | |
595 | return curr_flags; | |
c6c8fea2 SE |
596 | } |
597 | ||
56303d34 | 598 | static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, |
acd34afa | 599 | struct hlist_head *head) |
c6c8fea2 | 600 | { |
56303d34 SE |
601 | struct batadv_tt_local_entry *tt_local_entry; |
602 | struct batadv_tt_common_entry *tt_common_entry; | |
b67bfe0d | 603 | struct hlist_node *node_tmp; |
acd34afa | 604 | |
b67bfe0d | 605 | hlist_for_each_entry_safe(tt_common_entry, node_tmp, head, |
acd34afa SE |
606 | hash_entry) { |
607 | tt_local_entry = container_of(tt_common_entry, | |
56303d34 SE |
608 | struct batadv_tt_local_entry, |
609 | common); | |
acd34afa SE |
610 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE) |
611 | continue; | |
612 | ||
613 | /* entry already marked for deletion */ | |
614 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) | |
615 | continue; | |
616 | ||
617 | if (!batadv_has_timed_out(tt_local_entry->last_seen, | |
618 | BATADV_TT_LOCAL_TIMEOUT)) | |
619 | continue; | |
620 | ||
621 | batadv_tt_local_set_pending(bat_priv, tt_local_entry, | |
622 | BATADV_TT_CLIENT_DEL, "timed out"); | |
623 | } | |
624 | } | |
625 | ||
56303d34 | 626 | static void batadv_tt_local_purge(struct batadv_priv *bat_priv) |
acd34afa | 627 | { |
807736f6 | 628 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
c6c8fea2 | 629 | struct hlist_head *head; |
7683fdc1 | 630 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 631 | uint32_t i; |
c6c8fea2 | 632 | |
c6c8fea2 SE |
633 | for (i = 0; i < hash->size; i++) { |
634 | head = &hash->table[i]; | |
7683fdc1 | 635 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 636 | |
7683fdc1 | 637 | spin_lock_bh(list_lock); |
acd34afa | 638 | batadv_tt_local_purge_list(bat_priv, head); |
7683fdc1 | 639 | spin_unlock_bh(list_lock); |
c6c8fea2 | 640 | } |
c6c8fea2 SE |
641 | } |
642 | ||
56303d34 | 643 | static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 644 | { |
5bf74e9c | 645 | struct batadv_hashtable *hash; |
a73105b8 | 646 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
56303d34 SE |
647 | struct batadv_tt_common_entry *tt_common_entry; |
648 | struct batadv_tt_local_entry *tt_local; | |
b67bfe0d | 649 | struct hlist_node *node_tmp; |
7683fdc1 | 650 | struct hlist_head *head; |
c90681b8 | 651 | uint32_t i; |
a73105b8 | 652 | |
807736f6 | 653 | if (!bat_priv->tt.local_hash) |
c6c8fea2 SE |
654 | return; |
655 | ||
807736f6 | 656 | hash = bat_priv->tt.local_hash; |
a73105b8 AQ |
657 | |
658 | for (i = 0; i < hash->size; i++) { | |
659 | head = &hash->table[i]; | |
660 | list_lock = &hash->list_locks[i]; | |
661 | ||
662 | spin_lock_bh(list_lock); | |
b67bfe0d | 663 | hlist_for_each_entry_safe(tt_common_entry, node_tmp, |
a73105b8 | 664 | head, hash_entry) { |
b67bfe0d | 665 | hlist_del_rcu(&tt_common_entry->hash_entry); |
56303d34 SE |
666 | tt_local = container_of(tt_common_entry, |
667 | struct batadv_tt_local_entry, | |
668 | common); | |
669 | batadv_tt_local_entry_free_ref(tt_local); | |
a73105b8 AQ |
670 | } |
671 | spin_unlock_bh(list_lock); | |
672 | } | |
673 | ||
1a8eaf07 | 674 | batadv_hash_destroy(hash); |
a73105b8 | 675 | |
807736f6 | 676 | bat_priv->tt.local_hash = NULL; |
c6c8fea2 SE |
677 | } |
678 | ||
56303d34 | 679 | static int batadv_tt_global_init(struct batadv_priv *bat_priv) |
c6c8fea2 | 680 | { |
807736f6 | 681 | if (bat_priv->tt.global_hash) |
5346c35e | 682 | return 0; |
c6c8fea2 | 683 | |
807736f6 | 684 | bat_priv->tt.global_hash = batadv_hash_new(1024); |
c6c8fea2 | 685 | |
807736f6 | 686 | if (!bat_priv->tt.global_hash) |
5346c35e | 687 | return -ENOMEM; |
c6c8fea2 | 688 | |
dec05074 AQ |
689 | batadv_hash_set_lock_class(bat_priv->tt.global_hash, |
690 | &batadv_tt_global_hash_lock_class_key); | |
691 | ||
5346c35e | 692 | return 0; |
c6c8fea2 SE |
693 | } |
694 | ||
56303d34 | 695 | static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 696 | { |
56303d34 | 697 | struct batadv_tt_change_node *entry, *safe; |
c6c8fea2 | 698 | |
807736f6 | 699 | spin_lock_bh(&bat_priv->tt.changes_list_lock); |
c6c8fea2 | 700 | |
807736f6 | 701 | list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, |
a73105b8 AQ |
702 | list) { |
703 | list_del(&entry->list); | |
704 | kfree(entry); | |
705 | } | |
c6c8fea2 | 706 | |
807736f6 SE |
707 | atomic_set(&bat_priv->tt.local_changes, 0); |
708 | spin_unlock_bh(&bat_priv->tt.changes_list_lock); | |
a73105b8 | 709 | } |
c6c8fea2 | 710 | |
d657e621 AQ |
711 | /* retrieves the orig_tt_list_entry belonging to orig_node from the |
712 | * batadv_tt_global_entry list | |
713 | * | |
714 | * returns it with an increased refcounter, NULL if not found | |
db08e6e5 | 715 | */ |
d657e621 AQ |
716 | static struct batadv_tt_orig_list_entry * |
717 | batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry, | |
718 | const struct batadv_orig_node *orig_node) | |
db08e6e5 | 719 | { |
d657e621 | 720 | struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL; |
db08e6e5 | 721 | const struct hlist_head *head; |
db08e6e5 SW |
722 | |
723 | rcu_read_lock(); | |
724 | head = &entry->orig_list; | |
b67bfe0d | 725 | hlist_for_each_entry_rcu(tmp_orig_entry, head, list) { |
d657e621 AQ |
726 | if (tmp_orig_entry->orig_node != orig_node) |
727 | continue; | |
728 | if (!atomic_inc_not_zero(&tmp_orig_entry->refcount)) | |
729 | continue; | |
730 | ||
731 | orig_entry = tmp_orig_entry; | |
732 | break; | |
db08e6e5 SW |
733 | } |
734 | rcu_read_unlock(); | |
d657e621 AQ |
735 | |
736 | return orig_entry; | |
737 | } | |
738 | ||
739 | /* find out if an orig_node is already in the list of a tt_global_entry. | |
740 | * returns true if found, false otherwise | |
741 | */ | |
742 | static bool | |
743 | batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry, | |
744 | const struct batadv_orig_node *orig_node) | |
745 | { | |
746 | struct batadv_tt_orig_list_entry *orig_entry; | |
747 | bool found = false; | |
748 | ||
749 | orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node); | |
750 | if (orig_entry) { | |
751 | found = true; | |
752 | batadv_tt_orig_list_entry_free_ref(orig_entry); | |
753 | } | |
754 | ||
db08e6e5 SW |
755 | return found; |
756 | } | |
757 | ||
a513088d | 758 | static void |
d657e621 | 759 | batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global, |
56303d34 | 760 | struct batadv_orig_node *orig_node, int ttvn) |
db08e6e5 | 761 | { |
56303d34 | 762 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 | 763 | |
d657e621 | 764 | orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node); |
30cfd02b AQ |
765 | if (orig_entry) { |
766 | /* refresh the ttvn: the current value could be a bogus one that | |
767 | * was added during a "temporary client detection" | |
768 | */ | |
769 | orig_entry->ttvn = ttvn; | |
d657e621 | 770 | goto out; |
30cfd02b | 771 | } |
d657e621 | 772 | |
db08e6e5 SW |
773 | orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC); |
774 | if (!orig_entry) | |
d657e621 | 775 | goto out; |
db08e6e5 SW |
776 | |
777 | INIT_HLIST_NODE(&orig_entry->list); | |
778 | atomic_inc(&orig_node->refcount); | |
779 | atomic_inc(&orig_node->tt_size); | |
780 | orig_entry->orig_node = orig_node; | |
781 | orig_entry->ttvn = ttvn; | |
d657e621 | 782 | atomic_set(&orig_entry->refcount, 2); |
db08e6e5 | 783 | |
d657e621 | 784 | spin_lock_bh(&tt_global->list_lock); |
db08e6e5 | 785 | hlist_add_head_rcu(&orig_entry->list, |
d657e621 AQ |
786 | &tt_global->orig_list); |
787 | spin_unlock_bh(&tt_global->list_lock); | |
788 | out: | |
789 | if (orig_entry) | |
790 | batadv_tt_orig_list_entry_free_ref(orig_entry); | |
db08e6e5 SW |
791 | } |
792 | ||
d4ff40f6 AQ |
793 | /** |
794 | * batadv_tt_global_add - add a new TT global entry or update an existing one | |
795 | * @bat_priv: the bat priv with all the soft interface information | |
796 | * @orig_node: the originator announcing the client | |
797 | * @tt_addr: the mac address of the non-mesh client | |
798 | * @flags: TT flags that have to be set for this non-mesh client | |
799 | * @ttvn: the tt version number ever announcing this non-mesh client | |
800 | * | |
801 | * Add a new TT global entry for the given originator. If the entry already | |
802 | * exists add a new reference to the given originator (a global entry can have | |
803 | * references to multiple originators) and adjust the flags attribute to reflect | |
804 | * the function argument. | |
805 | * If a TT local entry exists for this non-mesh client remove it. | |
806 | * | |
807 | * The caller must hold orig_node refcount. | |
1e5d49fc AQ |
808 | * |
809 | * Return true if the new entry has been added, false otherwise | |
d4ff40f6 | 810 | */ |
1e5d49fc AQ |
811 | static bool batadv_tt_global_add(struct batadv_priv *bat_priv, |
812 | struct batadv_orig_node *orig_node, | |
813 | const unsigned char *tt_addr, uint16_t flags, | |
814 | uint8_t ttvn) | |
a73105b8 | 815 | { |
170173bf SE |
816 | struct batadv_tt_global_entry *tt_global_entry; |
817 | struct batadv_tt_local_entry *tt_local_entry; | |
1e5d49fc | 818 | bool ret = false; |
80b3f58c | 819 | int hash_added; |
56303d34 | 820 | struct batadv_tt_common_entry *common; |
7f91d06c | 821 | uint16_t local_flags; |
c6c8fea2 | 822 | |
a513088d | 823 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr); |
068ee6e2 AQ |
824 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr); |
825 | ||
826 | /* if the node already has a local client for this entry, it has to wait | |
827 | * for a roaming advertisement instead of manually messing up the global | |
828 | * table | |
829 | */ | |
830 | if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry && | |
831 | !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) | |
832 | goto out; | |
a73105b8 AQ |
833 | |
834 | if (!tt_global_entry) { | |
d4f44692 | 835 | tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC); |
a73105b8 | 836 | if (!tt_global_entry) |
7683fdc1 AQ |
837 | goto out; |
838 | ||
c0a55929 SE |
839 | common = &tt_global_entry->common; |
840 | memcpy(common->addr, tt_addr, ETH_ALEN); | |
db08e6e5 | 841 | |
d4f44692 | 842 | common->flags = flags; |
cc47f66e | 843 | tt_global_entry->roam_at = 0; |
fdf79320 AQ |
844 | /* node must store current time in case of roaming. This is |
845 | * needed to purge this entry out on timeout (if nobody claims | |
846 | * it) | |
847 | */ | |
848 | if (flags & BATADV_TT_CLIENT_ROAM) | |
849 | tt_global_entry->roam_at = jiffies; | |
c0a55929 | 850 | atomic_set(&common->refcount, 2); |
30cfd02b | 851 | common->added_at = jiffies; |
db08e6e5 SW |
852 | |
853 | INIT_HLIST_HEAD(&tt_global_entry->orig_list); | |
854 | spin_lock_init(&tt_global_entry->list_lock); | |
7683fdc1 | 855 | |
807736f6 | 856 | hash_added = batadv_hash_add(bat_priv->tt.global_hash, |
a513088d SE |
857 | batadv_compare_tt, |
858 | batadv_choose_orig, common, | |
859 | &common->hash_entry); | |
80b3f58c SW |
860 | |
861 | if (unlikely(hash_added != 0)) { | |
862 | /* remove the reference for the hash */ | |
a513088d | 863 | batadv_tt_global_entry_free_ref(tt_global_entry); |
80b3f58c SW |
864 | goto out_remove; |
865 | } | |
a73105b8 | 866 | } else { |
068ee6e2 | 867 | common = &tt_global_entry->common; |
30cfd02b AQ |
868 | /* If there is already a global entry, we can use this one for |
869 | * our processing. | |
068ee6e2 AQ |
870 | * But if we are trying to add a temporary client then here are |
871 | * two options at this point: | |
872 | * 1) the global client is not a temporary client: the global | |
873 | * client has to be left as it is, temporary information | |
874 | * should never override any already known client state | |
875 | * 2) the global client is a temporary client: purge the | |
876 | * originator list and add the new one orig_entry | |
30cfd02b | 877 | */ |
068ee6e2 AQ |
878 | if (flags & BATADV_TT_CLIENT_TEMP) { |
879 | if (!(common->flags & BATADV_TT_CLIENT_TEMP)) | |
880 | goto out; | |
881 | if (batadv_tt_global_entry_has_orig(tt_global_entry, | |
882 | orig_node)) | |
883 | goto out_remove; | |
884 | batadv_tt_global_del_orig_list(tt_global_entry); | |
885 | goto add_orig_entry; | |
886 | } | |
30cfd02b AQ |
887 | |
888 | /* if the client was temporary added before receiving the first | |
889 | * OGM announcing it, we have to clear the TEMP flag | |
890 | */ | |
068ee6e2 | 891 | common->flags &= ~BATADV_TT_CLIENT_TEMP; |
db08e6e5 | 892 | |
e9c00136 AQ |
893 | /* the change can carry possible "attribute" flags like the |
894 | * TT_CLIENT_WIFI, therefore they have to be copied in the | |
895 | * client entry | |
896 | */ | |
897 | tt_global_entry->common.flags |= flags; | |
898 | ||
acd34afa SE |
899 | /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only |
900 | * one originator left in the list and we previously received a | |
db08e6e5 SW |
901 | * delete + roaming change for this originator. |
902 | * | |
903 | * We should first delete the old originator before adding the | |
904 | * new one. | |
905 | */ | |
068ee6e2 | 906 | if (common->flags & BATADV_TT_CLIENT_ROAM) { |
a513088d | 907 | batadv_tt_global_del_orig_list(tt_global_entry); |
068ee6e2 | 908 | common->flags &= ~BATADV_TT_CLIENT_ROAM; |
db08e6e5 | 909 | tt_global_entry->roam_at = 0; |
a73105b8 AQ |
910 | } |
911 | } | |
068ee6e2 | 912 | add_orig_entry: |
30cfd02b | 913 | /* add the new orig_entry (if needed) or update it */ |
d657e621 | 914 | batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn); |
c6c8fea2 | 915 | |
39c75a51 | 916 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 917 | "Creating new global tt entry: %pM (via %pM)\n", |
068ee6e2 | 918 | common->addr, orig_node->orig); |
1e5d49fc | 919 | ret = true; |
c6c8fea2 | 920 | |
80b3f58c | 921 | out_remove: |
7f91d06c | 922 | |
a73105b8 | 923 | /* remove address from local hash if present */ |
7f91d06c AQ |
924 | local_flags = batadv_tt_local_remove(bat_priv, tt_addr, |
925 | "global tt received", | |
c1d07431 | 926 | flags & BATADV_TT_CLIENT_ROAM); |
7f91d06c AQ |
927 | tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI; |
928 | ||
068ee6e2 AQ |
929 | if (!(flags & BATADV_TT_CLIENT_ROAM)) |
930 | /* this is a normal global add. Therefore the client is not in a | |
931 | * roaming state anymore. | |
932 | */ | |
933 | tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM; | |
934 | ||
7683fdc1 AQ |
935 | out: |
936 | if (tt_global_entry) | |
a513088d | 937 | batadv_tt_global_entry_free_ref(tt_global_entry); |
068ee6e2 AQ |
938 | if (tt_local_entry) |
939 | batadv_tt_local_entry_free_ref(tt_local_entry); | |
7683fdc1 | 940 | return ret; |
c6c8fea2 SE |
941 | } |
942 | ||
981d8900 SE |
943 | /* batadv_transtable_best_orig - Get best originator list entry from tt entry |
944 | * @tt_global_entry: global translation table entry to be analyzed | |
945 | * | |
946 | * This functon assumes the caller holds rcu_read_lock(). | |
947 | * Returns best originator list entry or NULL on errors. | |
948 | */ | |
949 | static struct batadv_tt_orig_list_entry * | |
950 | batadv_transtable_best_orig(struct batadv_tt_global_entry *tt_global_entry) | |
951 | { | |
952 | struct batadv_neigh_node *router = NULL; | |
953 | struct hlist_head *head; | |
981d8900 SE |
954 | struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL; |
955 | int best_tq = 0; | |
956 | ||
957 | head = &tt_global_entry->orig_list; | |
b67bfe0d | 958 | hlist_for_each_entry_rcu(orig_entry, head, list) { |
981d8900 SE |
959 | router = batadv_orig_node_get_router(orig_entry->orig_node); |
960 | if (!router) | |
961 | continue; | |
962 | ||
963 | if (router->tq_avg > best_tq) { | |
964 | best_entry = orig_entry; | |
965 | best_tq = router->tq_avg; | |
966 | } | |
967 | ||
968 | batadv_neigh_node_free_ref(router); | |
969 | } | |
970 | ||
971 | return best_entry; | |
972 | } | |
973 | ||
974 | /* batadv_tt_global_print_entry - print all orig nodes who announce the address | |
975 | * for this global entry | |
976 | * @tt_global_entry: global translation table entry to be printed | |
977 | * @seq: debugfs table seq_file struct | |
978 | * | |
979 | * This functon assumes the caller holds rcu_read_lock(). | |
db08e6e5 | 980 | */ |
a513088d | 981 | static void |
56303d34 | 982 | batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry, |
a513088d | 983 | struct seq_file *seq) |
db08e6e5 SW |
984 | { |
985 | struct hlist_head *head; | |
981d8900 | 986 | struct batadv_tt_orig_list_entry *orig_entry, *best_entry; |
56303d34 | 987 | struct batadv_tt_common_entry *tt_common_entry; |
db08e6e5 SW |
988 | uint16_t flags; |
989 | uint8_t last_ttvn; | |
990 | ||
991 | tt_common_entry = &tt_global_entry->common; | |
981d8900 SE |
992 | flags = tt_common_entry->flags; |
993 | ||
994 | best_entry = batadv_transtable_best_orig(tt_global_entry); | |
995 | if (best_entry) { | |
996 | last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn); | |
f9d8a537 | 997 | seq_printf(seq, |
ced72933 | 998 | " %c %pM (%3u) via %pM (%3u) (%#.8x) [%c%c%c]\n", |
981d8900 SE |
999 | '*', tt_global_entry->common.addr, |
1000 | best_entry->ttvn, best_entry->orig_node->orig, | |
f9d8a537 | 1001 | last_ttvn, best_entry->orig_node->tt_crc, |
981d8900 SE |
1002 | (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), |
1003 | (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), | |
1004 | (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.')); | |
1005 | } | |
db08e6e5 SW |
1006 | |
1007 | head = &tt_global_entry->orig_list; | |
1008 | ||
b67bfe0d | 1009 | hlist_for_each_entry_rcu(orig_entry, head, list) { |
981d8900 SE |
1010 | if (best_entry == orig_entry) |
1011 | continue; | |
1012 | ||
db08e6e5 | 1013 | last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn); |
981d8900 SE |
1014 | seq_printf(seq, " %c %pM (%3u) via %pM (%3u) [%c%c%c]\n", |
1015 | '+', tt_global_entry->common.addr, | |
1016 | orig_entry->ttvn, orig_entry->orig_node->orig, | |
1017 | last_ttvn, | |
acd34afa | 1018 | (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), |
30cfd02b AQ |
1019 | (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), |
1020 | (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.')); | |
db08e6e5 SW |
1021 | } |
1022 | } | |
1023 | ||
08c36d3e | 1024 | int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
1025 | { |
1026 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1027 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 1028 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
56303d34 SE |
1029 | struct batadv_tt_common_entry *tt_common_entry; |
1030 | struct batadv_tt_global_entry *tt_global; | |
1031 | struct batadv_hard_iface *primary_if; | |
c6c8fea2 | 1032 | struct hlist_head *head; |
c90681b8 | 1033 | uint32_t i; |
c6c8fea2 | 1034 | |
30da63a6 ML |
1035 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1036 | if (!primary_if) | |
32ae9b22 | 1037 | goto out; |
c6c8fea2 | 1038 | |
2dafb49d AQ |
1039 | seq_printf(seq, |
1040 | "Globally announced TT entries received via the mesh %s\n", | |
c6c8fea2 | 1041 | net_dev->name); |
ced72933 | 1042 | seq_printf(seq, " %-13s %s %-15s %s (%-10s) %s\n", |
f9d8a537 AQ |
1043 | "Client", "(TTVN)", "Originator", "(Curr TTVN)", "CRC", |
1044 | "Flags"); | |
c6c8fea2 | 1045 | |
c6c8fea2 SE |
1046 | for (i = 0; i < hash->size; i++) { |
1047 | head = &hash->table[i]; | |
1048 | ||
7aadf889 | 1049 | rcu_read_lock(); |
b67bfe0d | 1050 | hlist_for_each_entry_rcu(tt_common_entry, |
7aadf889 | 1051 | head, hash_entry) { |
56303d34 SE |
1052 | tt_global = container_of(tt_common_entry, |
1053 | struct batadv_tt_global_entry, | |
1054 | common); | |
1055 | batadv_tt_global_print_entry(tt_global, seq); | |
c6c8fea2 | 1056 | } |
7aadf889 | 1057 | rcu_read_unlock(); |
c6c8fea2 | 1058 | } |
32ae9b22 ML |
1059 | out: |
1060 | if (primary_if) | |
e5d89254 | 1061 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 1062 | return 0; |
c6c8fea2 SE |
1063 | } |
1064 | ||
db08e6e5 | 1065 | /* deletes the orig list of a tt_global_entry */ |
a513088d | 1066 | static void |
56303d34 | 1067 | batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry) |
c6c8fea2 | 1068 | { |
db08e6e5 | 1069 | struct hlist_head *head; |
b67bfe0d | 1070 | struct hlist_node *safe; |
56303d34 | 1071 | struct batadv_tt_orig_list_entry *orig_entry; |
a73105b8 | 1072 | |
db08e6e5 SW |
1073 | spin_lock_bh(&tt_global_entry->list_lock); |
1074 | head = &tt_global_entry->orig_list; | |
b67bfe0d SL |
1075 | hlist_for_each_entry_safe(orig_entry, safe, head, list) { |
1076 | hlist_del_rcu(&orig_entry->list); | |
a513088d | 1077 | batadv_tt_orig_list_entry_free_ref(orig_entry); |
db08e6e5 SW |
1078 | } |
1079 | spin_unlock_bh(&tt_global_entry->list_lock); | |
db08e6e5 SW |
1080 | } |
1081 | ||
a513088d | 1082 | static void |
56303d34 SE |
1083 | batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv, |
1084 | struct batadv_tt_global_entry *tt_global_entry, | |
1085 | struct batadv_orig_node *orig_node, | |
a513088d | 1086 | const char *message) |
db08e6e5 SW |
1087 | { |
1088 | struct hlist_head *head; | |
b67bfe0d | 1089 | struct hlist_node *safe; |
56303d34 | 1090 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 SW |
1091 | |
1092 | spin_lock_bh(&tt_global_entry->list_lock); | |
1093 | head = &tt_global_entry->orig_list; | |
b67bfe0d | 1094 | hlist_for_each_entry_safe(orig_entry, safe, head, list) { |
db08e6e5 | 1095 | if (orig_entry->orig_node == orig_node) { |
39c75a51 | 1096 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1097 | "Deleting %pM from global tt entry %pM: %s\n", |
1098 | orig_node->orig, | |
1099 | tt_global_entry->common.addr, message); | |
b67bfe0d | 1100 | hlist_del_rcu(&orig_entry->list); |
a513088d | 1101 | batadv_tt_orig_list_entry_free_ref(orig_entry); |
db08e6e5 SW |
1102 | } |
1103 | } | |
1104 | spin_unlock_bh(&tt_global_entry->list_lock); | |
1105 | } | |
1106 | ||
db08e6e5 | 1107 | /* If the client is to be deleted, we check if it is the last origantor entry |
acd34afa SE |
1108 | * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the |
1109 | * timer, otherwise we simply remove the originator scheduled for deletion. | |
db08e6e5 | 1110 | */ |
a513088d | 1111 | static void |
56303d34 SE |
1112 | batadv_tt_global_del_roaming(struct batadv_priv *bat_priv, |
1113 | struct batadv_tt_global_entry *tt_global_entry, | |
1114 | struct batadv_orig_node *orig_node, | |
1115 | const char *message) | |
db08e6e5 SW |
1116 | { |
1117 | bool last_entry = true; | |
1118 | struct hlist_head *head; | |
56303d34 | 1119 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 SW |
1120 | |
1121 | /* no local entry exists, case 1: | |
1122 | * Check if this is the last one or if other entries exist. | |
1123 | */ | |
1124 | ||
1125 | rcu_read_lock(); | |
1126 | head = &tt_global_entry->orig_list; | |
b67bfe0d | 1127 | hlist_for_each_entry_rcu(orig_entry, head, list) { |
db08e6e5 SW |
1128 | if (orig_entry->orig_node != orig_node) { |
1129 | last_entry = false; | |
1130 | break; | |
1131 | } | |
1132 | } | |
1133 | rcu_read_unlock(); | |
1134 | ||
1135 | if (last_entry) { | |
1136 | /* its the last one, mark for roaming. */ | |
acd34afa | 1137 | tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; |
db08e6e5 SW |
1138 | tt_global_entry->roam_at = jiffies; |
1139 | } else | |
1140 | /* there is another entry, we can simply delete this | |
1141 | * one and can still use the other one. | |
1142 | */ | |
a513088d SE |
1143 | batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, |
1144 | orig_node, message); | |
db08e6e5 SW |
1145 | } |
1146 | ||
1147 | ||
1148 | ||
56303d34 SE |
1149 | static void batadv_tt_global_del(struct batadv_priv *bat_priv, |
1150 | struct batadv_orig_node *orig_node, | |
a513088d SE |
1151 | const unsigned char *addr, |
1152 | const char *message, bool roaming) | |
a73105b8 | 1153 | { |
170173bf | 1154 | struct batadv_tt_global_entry *tt_global_entry; |
56303d34 | 1155 | struct batadv_tt_local_entry *local_entry = NULL; |
a73105b8 | 1156 | |
a513088d | 1157 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
db08e6e5 | 1158 | if (!tt_global_entry) |
7683fdc1 | 1159 | goto out; |
a73105b8 | 1160 | |
db08e6e5 | 1161 | if (!roaming) { |
a513088d SE |
1162 | batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, |
1163 | orig_node, message); | |
db08e6e5 SW |
1164 | |
1165 | if (hlist_empty(&tt_global_entry->orig_list)) | |
be73b488 AQ |
1166 | batadv_tt_global_free(bat_priv, tt_global_entry, |
1167 | message); | |
db08e6e5 SW |
1168 | |
1169 | goto out; | |
1170 | } | |
92f90f56 SE |
1171 | |
1172 | /* if we are deleting a global entry due to a roam | |
1173 | * event, there are two possibilities: | |
db08e6e5 SW |
1174 | * 1) the client roamed from node A to node B => if there |
1175 | * is only one originator left for this client, we mark | |
acd34afa | 1176 | * it with BATADV_TT_CLIENT_ROAM, we start a timer and we |
92f90f56 SE |
1177 | * wait for node B to claim it. In case of timeout |
1178 | * the entry is purged. | |
db08e6e5 SW |
1179 | * |
1180 | * If there are other originators left, we directly delete | |
1181 | * the originator. | |
92f90f56 | 1182 | * 2) the client roamed to us => we can directly delete |
9cfc7bd6 SE |
1183 | * the global entry, since it is useless now. |
1184 | */ | |
a513088d SE |
1185 | local_entry = batadv_tt_local_hash_find(bat_priv, |
1186 | tt_global_entry->common.addr); | |
1187 | if (local_entry) { | |
db08e6e5 | 1188 | /* local entry exists, case 2: client roamed to us. */ |
a513088d | 1189 | batadv_tt_global_del_orig_list(tt_global_entry); |
be73b488 | 1190 | batadv_tt_global_free(bat_priv, tt_global_entry, message); |
db08e6e5 SW |
1191 | } else |
1192 | /* no local entry exists, case 1: check for roaming */ | |
a513088d SE |
1193 | batadv_tt_global_del_roaming(bat_priv, tt_global_entry, |
1194 | orig_node, message); | |
92f90f56 | 1195 | |
92f90f56 | 1196 | |
cc47f66e | 1197 | out: |
7683fdc1 | 1198 | if (tt_global_entry) |
a513088d SE |
1199 | batadv_tt_global_entry_free_ref(tt_global_entry); |
1200 | if (local_entry) | |
1201 | batadv_tt_local_entry_free_ref(local_entry); | |
a73105b8 AQ |
1202 | } |
1203 | ||
56303d34 SE |
1204 | void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, |
1205 | struct batadv_orig_node *orig_node, | |
1206 | const char *message) | |
c6c8fea2 | 1207 | { |
56303d34 SE |
1208 | struct batadv_tt_global_entry *tt_global; |
1209 | struct batadv_tt_common_entry *tt_common_entry; | |
c90681b8 | 1210 | uint32_t i; |
807736f6 | 1211 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
b67bfe0d | 1212 | struct hlist_node *safe; |
a73105b8 | 1213 | struct hlist_head *head; |
7683fdc1 | 1214 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c6c8fea2 | 1215 | |
6e801494 SW |
1216 | if (!hash) |
1217 | return; | |
1218 | ||
a73105b8 AQ |
1219 | for (i = 0; i < hash->size; i++) { |
1220 | head = &hash->table[i]; | |
7683fdc1 | 1221 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 1222 | |
7683fdc1 | 1223 | spin_lock_bh(list_lock); |
b67bfe0d | 1224 | hlist_for_each_entry_safe(tt_common_entry, safe, |
7c64fd98 | 1225 | head, hash_entry) { |
56303d34 SE |
1226 | tt_global = container_of(tt_common_entry, |
1227 | struct batadv_tt_global_entry, | |
1228 | common); | |
db08e6e5 | 1229 | |
56303d34 | 1230 | batadv_tt_global_del_orig_entry(bat_priv, tt_global, |
a513088d | 1231 | orig_node, message); |
db08e6e5 | 1232 | |
56303d34 | 1233 | if (hlist_empty(&tt_global->orig_list)) { |
39c75a51 | 1234 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 1235 | "Deleting global tt entry %pM: %s\n", |
56303d34 | 1236 | tt_global->common.addr, message); |
b67bfe0d | 1237 | hlist_del_rcu(&tt_common_entry->hash_entry); |
56303d34 | 1238 | batadv_tt_global_entry_free_ref(tt_global); |
7683fdc1 | 1239 | } |
a73105b8 | 1240 | } |
7683fdc1 | 1241 | spin_unlock_bh(list_lock); |
c6c8fea2 | 1242 | } |
17071578 | 1243 | orig_node->tt_initialised = false; |
c6c8fea2 SE |
1244 | } |
1245 | ||
30cfd02b AQ |
1246 | static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global, |
1247 | char **msg) | |
cc47f66e | 1248 | { |
30cfd02b AQ |
1249 | bool purge = false; |
1250 | unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT; | |
1251 | unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT; | |
42d0b044 | 1252 | |
30cfd02b AQ |
1253 | if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) && |
1254 | batadv_has_timed_out(tt_global->roam_at, roam_timeout)) { | |
1255 | purge = true; | |
1256 | *msg = "Roaming timeout\n"; | |
1257 | } | |
42d0b044 | 1258 | |
30cfd02b AQ |
1259 | if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) && |
1260 | batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) { | |
1261 | purge = true; | |
1262 | *msg = "Temporary client timeout\n"; | |
42d0b044 | 1263 | } |
30cfd02b AQ |
1264 | |
1265 | return purge; | |
42d0b044 SE |
1266 | } |
1267 | ||
30cfd02b | 1268 | static void batadv_tt_global_purge(struct batadv_priv *bat_priv) |
42d0b044 | 1269 | { |
807736f6 | 1270 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
cc47f66e | 1271 | struct hlist_head *head; |
b67bfe0d | 1272 | struct hlist_node *node_tmp; |
7683fdc1 | 1273 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 1274 | uint32_t i; |
30cfd02b AQ |
1275 | char *msg = NULL; |
1276 | struct batadv_tt_common_entry *tt_common; | |
1277 | struct batadv_tt_global_entry *tt_global; | |
cc47f66e | 1278 | |
cc47f66e AQ |
1279 | for (i = 0; i < hash->size; i++) { |
1280 | head = &hash->table[i]; | |
7683fdc1 | 1281 | list_lock = &hash->list_locks[i]; |
cc47f66e | 1282 | |
7683fdc1 | 1283 | spin_lock_bh(list_lock); |
b67bfe0d | 1284 | hlist_for_each_entry_safe(tt_common, node_tmp, head, |
30cfd02b AQ |
1285 | hash_entry) { |
1286 | tt_global = container_of(tt_common, | |
1287 | struct batadv_tt_global_entry, | |
1288 | common); | |
1289 | ||
1290 | if (!batadv_tt_global_to_purge(tt_global, &msg)) | |
1291 | continue; | |
1292 | ||
1293 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
1294 | "Deleting global tt entry (%pM): %s\n", | |
1295 | tt_global->common.addr, msg); | |
1296 | ||
b67bfe0d | 1297 | hlist_del_rcu(&tt_common->hash_entry); |
30cfd02b AQ |
1298 | |
1299 | batadv_tt_global_entry_free_ref(tt_global); | |
1300 | } | |
7683fdc1 | 1301 | spin_unlock_bh(list_lock); |
cc47f66e | 1302 | } |
cc47f66e AQ |
1303 | } |
1304 | ||
56303d34 | 1305 | static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 1306 | { |
5bf74e9c | 1307 | struct batadv_hashtable *hash; |
7683fdc1 | 1308 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
56303d34 SE |
1309 | struct batadv_tt_common_entry *tt_common_entry; |
1310 | struct batadv_tt_global_entry *tt_global; | |
b67bfe0d | 1311 | struct hlist_node *node_tmp; |
7683fdc1 | 1312 | struct hlist_head *head; |
c90681b8 | 1313 | uint32_t i; |
7683fdc1 | 1314 | |
807736f6 | 1315 | if (!bat_priv->tt.global_hash) |
c6c8fea2 SE |
1316 | return; |
1317 | ||
807736f6 | 1318 | hash = bat_priv->tt.global_hash; |
7683fdc1 AQ |
1319 | |
1320 | for (i = 0; i < hash->size; i++) { | |
1321 | head = &hash->table[i]; | |
1322 | list_lock = &hash->list_locks[i]; | |
1323 | ||
1324 | spin_lock_bh(list_lock); | |
b67bfe0d | 1325 | hlist_for_each_entry_safe(tt_common_entry, node_tmp, |
7683fdc1 | 1326 | head, hash_entry) { |
b67bfe0d | 1327 | hlist_del_rcu(&tt_common_entry->hash_entry); |
56303d34 SE |
1328 | tt_global = container_of(tt_common_entry, |
1329 | struct batadv_tt_global_entry, | |
1330 | common); | |
1331 | batadv_tt_global_entry_free_ref(tt_global); | |
7683fdc1 AQ |
1332 | } |
1333 | spin_unlock_bh(list_lock); | |
1334 | } | |
1335 | ||
1a8eaf07 | 1336 | batadv_hash_destroy(hash); |
7683fdc1 | 1337 | |
807736f6 | 1338 | bat_priv->tt.global_hash = NULL; |
c6c8fea2 SE |
1339 | } |
1340 | ||
56303d34 SE |
1341 | static bool |
1342 | _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry, | |
1343 | struct batadv_tt_global_entry *tt_global_entry) | |
59b699cd AQ |
1344 | { |
1345 | bool ret = false; | |
1346 | ||
acd34afa SE |
1347 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI && |
1348 | tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI) | |
59b699cd AQ |
1349 | ret = true; |
1350 | ||
1351 | return ret; | |
1352 | } | |
1353 | ||
56303d34 SE |
1354 | struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, |
1355 | const uint8_t *src, | |
1356 | const uint8_t *addr) | |
c6c8fea2 | 1357 | { |
56303d34 SE |
1358 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
1359 | struct batadv_tt_global_entry *tt_global_entry = NULL; | |
1360 | struct batadv_orig_node *orig_node = NULL; | |
981d8900 | 1361 | struct batadv_tt_orig_list_entry *best_entry; |
c6c8fea2 | 1362 | |
3d393e47 | 1363 | if (src && atomic_read(&bat_priv->ap_isolation)) { |
a513088d | 1364 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, src); |
068ee6e2 AQ |
1365 | if (!tt_local_entry || |
1366 | (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)) | |
3d393e47 AQ |
1367 | goto out; |
1368 | } | |
7aadf889 | 1369 | |
a513088d | 1370 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
2dafb49d | 1371 | if (!tt_global_entry) |
7b36e8ee | 1372 | goto out; |
7aadf889 | 1373 | |
3d393e47 | 1374 | /* check whether the clients should not communicate due to AP |
9cfc7bd6 SE |
1375 | * isolation |
1376 | */ | |
a513088d SE |
1377 | if (tt_local_entry && |
1378 | _batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) | |
3d393e47 AQ |
1379 | goto out; |
1380 | ||
db08e6e5 | 1381 | rcu_read_lock(); |
981d8900 | 1382 | best_entry = batadv_transtable_best_orig(tt_global_entry); |
db08e6e5 | 1383 | /* found anything? */ |
981d8900 SE |
1384 | if (best_entry) |
1385 | orig_node = best_entry->orig_node; | |
db08e6e5 SW |
1386 | if (orig_node && !atomic_inc_not_zero(&orig_node->refcount)) |
1387 | orig_node = NULL; | |
1388 | rcu_read_unlock(); | |
981d8900 | 1389 | |
7b36e8ee | 1390 | out: |
3d393e47 | 1391 | if (tt_global_entry) |
a513088d | 1392 | batadv_tt_global_entry_free_ref(tt_global_entry); |
3d393e47 | 1393 | if (tt_local_entry) |
a513088d | 1394 | batadv_tt_local_entry_free_ref(tt_local_entry); |
3d393e47 | 1395 | |
7b36e8ee | 1396 | return orig_node; |
c6c8fea2 | 1397 | } |
a73105b8 | 1398 | |
ced72933 AQ |
1399 | /** |
1400 | * batadv_tt_global_crc - calculates the checksum of the local table belonging | |
1401 | * to the given orig_node | |
1402 | * @bat_priv: the bat priv with all the soft interface information | |
1403 | */ | |
1404 | static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv, | |
56303d34 | 1405 | struct batadv_orig_node *orig_node) |
a73105b8 | 1406 | { |
807736f6 | 1407 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
56303d34 SE |
1408 | struct batadv_tt_common_entry *tt_common; |
1409 | struct batadv_tt_global_entry *tt_global; | |
a73105b8 | 1410 | struct hlist_head *head; |
ced72933 | 1411 | uint32_t i, crc = 0; |
a73105b8 AQ |
1412 | |
1413 | for (i = 0; i < hash->size; i++) { | |
1414 | head = &hash->table[i]; | |
1415 | ||
1416 | rcu_read_lock(); | |
b67bfe0d | 1417 | hlist_for_each_entry_rcu(tt_common, head, hash_entry) { |
56303d34 SE |
1418 | tt_global = container_of(tt_common, |
1419 | struct batadv_tt_global_entry, | |
1420 | common); | |
db08e6e5 SW |
1421 | /* Roaming clients are in the global table for |
1422 | * consistency only. They don't have to be | |
1423 | * taken into account while computing the | |
1424 | * global crc | |
1425 | */ | |
acd34afa | 1426 | if (tt_common->flags & BATADV_TT_CLIENT_ROAM) |
db08e6e5 | 1427 | continue; |
30cfd02b AQ |
1428 | /* Temporary clients have not been announced yet, so |
1429 | * they have to be skipped while computing the global | |
1430 | * crc | |
1431 | */ | |
1432 | if (tt_common->flags & BATADV_TT_CLIENT_TEMP) | |
1433 | continue; | |
db08e6e5 SW |
1434 | |
1435 | /* find out if this global entry is announced by this | |
1436 | * originator | |
1437 | */ | |
56303d34 | 1438 | if (!batadv_tt_global_entry_has_orig(tt_global, |
a513088d | 1439 | orig_node)) |
db08e6e5 SW |
1440 | continue; |
1441 | ||
ced72933 | 1442 | crc ^= crc32c(0, tt_common->addr, ETH_ALEN); |
a73105b8 AQ |
1443 | } |
1444 | rcu_read_unlock(); | |
1445 | } | |
1446 | ||
ced72933 | 1447 | return crc; |
a73105b8 AQ |
1448 | } |
1449 | ||
ced72933 AQ |
1450 | /** |
1451 | * batadv_tt_local_crc - calculates the checksum of the local table | |
1452 | * @bat_priv: the bat priv with all the soft interface information | |
1453 | */ | |
1454 | static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv) | |
a73105b8 | 1455 | { |
807736f6 | 1456 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
56303d34 | 1457 | struct batadv_tt_common_entry *tt_common; |
a73105b8 | 1458 | struct hlist_head *head; |
ced72933 | 1459 | uint32_t i, crc = 0; |
a73105b8 AQ |
1460 | |
1461 | for (i = 0; i < hash->size; i++) { | |
1462 | head = &hash->table[i]; | |
1463 | ||
1464 | rcu_read_lock(); | |
b67bfe0d | 1465 | hlist_for_each_entry_rcu(tt_common, head, hash_entry) { |
058d0e26 | 1466 | /* not yet committed clients have not to be taken into |
9cfc7bd6 SE |
1467 | * account while computing the CRC |
1468 | */ | |
acd34afa | 1469 | if (tt_common->flags & BATADV_TT_CLIENT_NEW) |
058d0e26 | 1470 | continue; |
ced72933 AQ |
1471 | |
1472 | crc ^= crc32c(0, tt_common->addr, ETH_ALEN); | |
a73105b8 | 1473 | } |
a73105b8 AQ |
1474 | rcu_read_unlock(); |
1475 | } | |
1476 | ||
ced72933 | 1477 | return crc; |
a73105b8 AQ |
1478 | } |
1479 | ||
56303d34 | 1480 | static void batadv_tt_req_list_free(struct batadv_priv *bat_priv) |
a73105b8 | 1481 | { |
56303d34 | 1482 | struct batadv_tt_req_node *node, *safe; |
a73105b8 | 1483 | |
807736f6 | 1484 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 | 1485 | |
807736f6 | 1486 | list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { |
a73105b8 AQ |
1487 | list_del(&node->list); |
1488 | kfree(node); | |
1489 | } | |
1490 | ||
807736f6 | 1491 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1492 | } |
1493 | ||
56303d34 SE |
1494 | static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv, |
1495 | struct batadv_orig_node *orig_node, | |
a513088d | 1496 | const unsigned char *tt_buff, |
e1bf0c14 | 1497 | uint16_t tt_num_changes) |
a73105b8 | 1498 | { |
08c36d3e | 1499 | uint16_t tt_buff_len = batadv_tt_len(tt_num_changes); |
a73105b8 AQ |
1500 | |
1501 | /* Replace the old buffer only if I received something in the | |
9cfc7bd6 SE |
1502 | * last OGM (the OGM could carry no changes) |
1503 | */ | |
a73105b8 AQ |
1504 | spin_lock_bh(&orig_node->tt_buff_lock); |
1505 | if (tt_buff_len > 0) { | |
1506 | kfree(orig_node->tt_buff); | |
1507 | orig_node->tt_buff_len = 0; | |
1508 | orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); | |
1509 | if (orig_node->tt_buff) { | |
1510 | memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); | |
1511 | orig_node->tt_buff_len = tt_buff_len; | |
1512 | } | |
1513 | } | |
1514 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1515 | } | |
1516 | ||
56303d34 | 1517 | static void batadv_tt_req_purge(struct batadv_priv *bat_priv) |
a73105b8 | 1518 | { |
56303d34 | 1519 | struct batadv_tt_req_node *node, *safe; |
a73105b8 | 1520 | |
807736f6 SE |
1521 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
1522 | list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { | |
42d0b044 SE |
1523 | if (batadv_has_timed_out(node->issued_at, |
1524 | BATADV_TT_REQUEST_TIMEOUT)) { | |
a73105b8 AQ |
1525 | list_del(&node->list); |
1526 | kfree(node); | |
1527 | } | |
1528 | } | |
807736f6 | 1529 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1530 | } |
1531 | ||
1532 | /* returns the pointer to the new tt_req_node struct if no request | |
9cfc7bd6 SE |
1533 | * has already been issued for this orig_node, NULL otherwise |
1534 | */ | |
56303d34 SE |
1535 | static struct batadv_tt_req_node * |
1536 | batadv_new_tt_req_node(struct batadv_priv *bat_priv, | |
1537 | struct batadv_orig_node *orig_node) | |
a73105b8 | 1538 | { |
56303d34 | 1539 | struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; |
a73105b8 | 1540 | |
807736f6 SE |
1541 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
1542 | list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) { | |
1eda58bf SE |
1543 | if (batadv_compare_eth(tt_req_node_tmp, orig_node) && |
1544 | !batadv_has_timed_out(tt_req_node_tmp->issued_at, | |
42d0b044 | 1545 | BATADV_TT_REQUEST_TIMEOUT)) |
a73105b8 AQ |
1546 | goto unlock; |
1547 | } | |
1548 | ||
1549 | tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); | |
1550 | if (!tt_req_node) | |
1551 | goto unlock; | |
1552 | ||
1553 | memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); | |
1554 | tt_req_node->issued_at = jiffies; | |
1555 | ||
807736f6 | 1556 | list_add(&tt_req_node->list, &bat_priv->tt.req_list); |
a73105b8 | 1557 | unlock: |
807736f6 | 1558 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1559 | return tt_req_node; |
1560 | } | |
1561 | ||
335fbe0f ML |
1562 | /** |
1563 | * batadv_tt_local_valid - verify that given tt entry is a valid one | |
1564 | * @entry_ptr: to be checked local tt entry | |
1565 | * @data_ptr: not used but definition required to satisfy the callback prototype | |
1566 | * | |
1567 | * Returns 1 if the entry is a valid, 0 otherwise. | |
1568 | */ | |
1569 | static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr) | |
058d0e26 | 1570 | { |
56303d34 | 1571 | const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; |
058d0e26 | 1572 | |
acd34afa | 1573 | if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW) |
058d0e26 AQ |
1574 | return 0; |
1575 | return 1; | |
1576 | } | |
1577 | ||
a513088d SE |
1578 | static int batadv_tt_global_valid(const void *entry_ptr, |
1579 | const void *data_ptr) | |
a73105b8 | 1580 | { |
56303d34 SE |
1581 | const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; |
1582 | const struct batadv_tt_global_entry *tt_global_entry; | |
1583 | const struct batadv_orig_node *orig_node = data_ptr; | |
a73105b8 | 1584 | |
30cfd02b AQ |
1585 | if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM || |
1586 | tt_common_entry->flags & BATADV_TT_CLIENT_TEMP) | |
cc47f66e AQ |
1587 | return 0; |
1588 | ||
56303d34 SE |
1589 | tt_global_entry = container_of(tt_common_entry, |
1590 | struct batadv_tt_global_entry, | |
48100bac AQ |
1591 | common); |
1592 | ||
a513088d | 1593 | return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node); |
a73105b8 AQ |
1594 | } |
1595 | ||
335fbe0f ML |
1596 | /** |
1597 | * batadv_tt_tvlv_generate - creates tvlv tt data buffer to fill it with the | |
1598 | * tt entries from the specified tt hash | |
1599 | * @bat_priv: the bat priv with all the soft interface information | |
1600 | * @hash: hash table containing the tt entries | |
1601 | * @tt_len: expected tvlv tt data buffer length in number of bytes | |
1602 | * @valid_cb: function to filter tt change entries | |
1603 | * @cb_data: data passed to the filter function as argument | |
1604 | * | |
1605 | * Returns pointer to allocated tvlv tt data buffer if operation was | |
1606 | * successful or NULL otherwise. | |
1607 | */ | |
1608 | static struct batadv_tvlv_tt_data * | |
1609 | batadv_tt_tvlv_generate(struct batadv_priv *bat_priv, | |
1610 | struct batadv_hashtable *hash, uint16_t tt_len, | |
1611 | int (*valid_cb)(const void *, const void *), | |
1612 | void *cb_data) | |
a73105b8 | 1613 | { |
56303d34 | 1614 | struct batadv_tt_common_entry *tt_common_entry; |
335fbe0f ML |
1615 | struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; |
1616 | struct batadv_tvlv_tt_change *tt_change; | |
a73105b8 | 1617 | struct hlist_head *head; |
335fbe0f ML |
1618 | uint16_t tt_tot, tt_num_entries = 0; |
1619 | ssize_t tvlv_tt_size = sizeof(struct batadv_tvlv_tt_data); | |
c90681b8 | 1620 | uint32_t i; |
a73105b8 | 1621 | |
335fbe0f ML |
1622 | if (tvlv_tt_size + tt_len > bat_priv->soft_iface->mtu) { |
1623 | tt_len = bat_priv->soft_iface->mtu - tvlv_tt_size; | |
1624 | tt_len -= tt_len % sizeof(struct batadv_tvlv_tt_change); | |
a73105b8 | 1625 | } |
a73105b8 | 1626 | |
335fbe0f | 1627 | tt_tot = tt_len / sizeof(struct batadv_tvlv_tt_change); |
a73105b8 | 1628 | |
335fbe0f ML |
1629 | tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data) + tt_len, |
1630 | GFP_ATOMIC); | |
1631 | if (!tvlv_tt_data) | |
1632 | goto out; | |
a73105b8 | 1633 | |
335fbe0f | 1634 | tt_change = (struct batadv_tvlv_tt_change *)(tvlv_tt_data + 1); |
a73105b8 AQ |
1635 | |
1636 | rcu_read_lock(); | |
1637 | for (i = 0; i < hash->size; i++) { | |
1638 | head = &hash->table[i]; | |
1639 | ||
b67bfe0d | 1640 | hlist_for_each_entry_rcu(tt_common_entry, |
a73105b8 | 1641 | head, hash_entry) { |
335fbe0f | 1642 | if (tt_tot == tt_num_entries) |
a73105b8 AQ |
1643 | break; |
1644 | ||
48100bac | 1645 | if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data))) |
a73105b8 AQ |
1646 | continue; |
1647 | ||
48100bac AQ |
1648 | memcpy(tt_change->addr, tt_common_entry->addr, |
1649 | ETH_ALEN); | |
27b37ebf | 1650 | tt_change->flags = tt_common_entry->flags; |
335fbe0f | 1651 | tt_change->reserved = 0; |
a73105b8 | 1652 | |
335fbe0f | 1653 | tt_num_entries++; |
a73105b8 AQ |
1654 | tt_change++; |
1655 | } | |
1656 | } | |
1657 | rcu_read_unlock(); | |
1658 | ||
1659 | out: | |
335fbe0f | 1660 | return tvlv_tt_data; |
a73105b8 AQ |
1661 | } |
1662 | ||
ced72933 AQ |
1663 | /** |
1664 | * batadv_send_tt_request - send a TT Request message to a given node | |
1665 | * @bat_priv: the bat priv with all the soft interface information | |
1666 | * @dst_orig_node: the destination of the message | |
1667 | * @ttvn: the version number that the source of the message is looking for | |
1668 | * @tt_crc: the CRC associated with the version number | |
1669 | * @full_table: ask for the entire translation table if true, while only for the | |
1670 | * last TT diff otherwise | |
1671 | */ | |
56303d34 SE |
1672 | static int batadv_send_tt_request(struct batadv_priv *bat_priv, |
1673 | struct batadv_orig_node *dst_orig_node, | |
ced72933 | 1674 | uint8_t ttvn, uint32_t tt_crc, |
a513088d | 1675 | bool full_table) |
a73105b8 | 1676 | { |
335fbe0f | 1677 | struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; |
56303d34 SE |
1678 | struct batadv_hard_iface *primary_if; |
1679 | struct batadv_tt_req_node *tt_req_node = NULL; | |
335fbe0f | 1680 | bool ret = false; |
a73105b8 | 1681 | |
e5d89254 | 1682 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1683 | if (!primary_if) |
1684 | goto out; | |
1685 | ||
1686 | /* The new tt_req will be issued only if I'm not waiting for a | |
9cfc7bd6 SE |
1687 | * reply from the same orig_node yet |
1688 | */ | |
a513088d | 1689 | tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node); |
a73105b8 AQ |
1690 | if (!tt_req_node) |
1691 | goto out; | |
1692 | ||
335fbe0f ML |
1693 | tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data), GFP_ATOMIC); |
1694 | if (!tvlv_tt_data) | |
a73105b8 AQ |
1695 | goto out; |
1696 | ||
335fbe0f ML |
1697 | tvlv_tt_data->flags = BATADV_TT_REQUEST; |
1698 | tvlv_tt_data->ttvn = ttvn; | |
ced72933 | 1699 | tvlv_tt_data->crc = htonl(tt_crc); |
a73105b8 AQ |
1700 | |
1701 | if (full_table) | |
335fbe0f | 1702 | tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1703 | |
bb351ba0 | 1704 | batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n", |
335fbe0f | 1705 | dst_orig_node->orig, full_table ? 'F' : '.'); |
a73105b8 | 1706 | |
d69909d2 | 1707 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX); |
335fbe0f ML |
1708 | batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr, |
1709 | dst_orig_node->orig, BATADV_TVLV_TT, 1, | |
1710 | tvlv_tt_data, sizeof(*tvlv_tt_data)); | |
1711 | ret = true; | |
a73105b8 AQ |
1712 | |
1713 | out: | |
a73105b8 | 1714 | if (primary_if) |
e5d89254 | 1715 | batadv_hardif_free_ref(primary_if); |
a73105b8 | 1716 | if (ret && tt_req_node) { |
807736f6 | 1717 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 | 1718 | list_del(&tt_req_node->list); |
807736f6 | 1719 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1720 | kfree(tt_req_node); |
1721 | } | |
335fbe0f | 1722 | kfree(tvlv_tt_data); |
a73105b8 AQ |
1723 | return ret; |
1724 | } | |
1725 | ||
335fbe0f ML |
1726 | /** |
1727 | * batadv_send_other_tt_response - send reply to tt request concerning another | |
1728 | * node's translation table | |
1729 | * @bat_priv: the bat priv with all the soft interface information | |
1730 | * @tt_data: tt data containing the tt request information | |
1731 | * @req_src: mac address of tt request sender | |
1732 | * @req_dst: mac address of tt request recipient | |
1733 | * | |
1734 | * Returns true if tt request reply was sent, false otherwise. | |
1735 | */ | |
1736 | static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv, | |
1737 | struct batadv_tvlv_tt_data *tt_data, | |
1738 | uint8_t *req_src, uint8_t *req_dst) | |
a73105b8 | 1739 | { |
170173bf | 1740 | struct batadv_orig_node *req_dst_orig_node; |
56303d34 | 1741 | struct batadv_orig_node *res_dst_orig_node = NULL; |
335fbe0f ML |
1742 | struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; |
1743 | uint8_t orig_ttvn, req_ttvn; | |
1744 | uint16_t tt_len; | |
1745 | bool ret = false, full_table; | |
a73105b8 | 1746 | |
39c75a51 | 1747 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 1748 | "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", |
335fbe0f ML |
1749 | req_src, tt_data->ttvn, req_dst, |
1750 | (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); | |
a73105b8 AQ |
1751 | |
1752 | /* Let's get the orig node of the REAL destination */ | |
335fbe0f | 1753 | req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst); |
a73105b8 AQ |
1754 | if (!req_dst_orig_node) |
1755 | goto out; | |
1756 | ||
335fbe0f | 1757 | res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src); |
a73105b8 AQ |
1758 | if (!res_dst_orig_node) |
1759 | goto out; | |
1760 | ||
a73105b8 | 1761 | orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); |
335fbe0f | 1762 | req_ttvn = tt_data->ttvn; |
a73105b8 | 1763 | |
335fbe0f | 1764 | /* this node doesn't have the requested data */ |
a73105b8 | 1765 | if (orig_ttvn != req_ttvn || |
ced72933 | 1766 | tt_data->crc != htonl(req_dst_orig_node->tt_crc)) |
a73105b8 AQ |
1767 | goto out; |
1768 | ||
015758d0 | 1769 | /* If the full table has been explicitly requested */ |
335fbe0f | 1770 | if (tt_data->flags & BATADV_TT_FULL_TABLE || |
a73105b8 AQ |
1771 | !req_dst_orig_node->tt_buff) |
1772 | full_table = true; | |
1773 | else | |
1774 | full_table = false; | |
1775 | ||
335fbe0f ML |
1776 | /* TT fragmentation hasn't been implemented yet, so send as many |
1777 | * TT entries fit a single packet as possible only | |
9cfc7bd6 | 1778 | */ |
a73105b8 AQ |
1779 | if (!full_table) { |
1780 | spin_lock_bh(&req_dst_orig_node->tt_buff_lock); | |
1781 | tt_len = req_dst_orig_node->tt_buff_len; | |
a73105b8 | 1782 | |
335fbe0f ML |
1783 | tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data) + tt_len, |
1784 | GFP_ATOMIC); | |
1785 | if (!tvlv_tt_data) | |
a73105b8 AQ |
1786 | goto unlock; |
1787 | ||
a73105b8 | 1788 | /* Copy the last orig_node's OGM buffer */ |
335fbe0f | 1789 | memcpy(tvlv_tt_data + 1, req_dst_orig_node->tt_buff, |
a73105b8 | 1790 | req_dst_orig_node->tt_buff_len); |
a73105b8 AQ |
1791 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); |
1792 | } else { | |
96412690 | 1793 | tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size); |
335fbe0f ML |
1794 | tt_len = batadv_tt_len(tt_len); |
1795 | ||
1796 | tvlv_tt_data = batadv_tt_tvlv_generate(bat_priv, | |
1797 | bat_priv->tt.global_hash, | |
1798 | tt_len, | |
1799 | batadv_tt_global_valid, | |
1800 | req_dst_orig_node); | |
1801 | if (!tvlv_tt_data) | |
a73105b8 | 1802 | goto out; |
a73105b8 AQ |
1803 | } |
1804 | ||
335fbe0f ML |
1805 | tvlv_tt_data->flags = BATADV_TT_RESPONSE; |
1806 | tvlv_tt_data->ttvn = req_ttvn; | |
a73105b8 AQ |
1807 | |
1808 | if (full_table) | |
335fbe0f | 1809 | tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1810 | |
39c75a51 | 1811 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
335fbe0f ML |
1812 | "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n", |
1813 | res_dst_orig_node->orig, req_dst_orig_node->orig, | |
1814 | full_table ? 'F' : '.', req_ttvn); | |
a73105b8 | 1815 | |
d69909d2 | 1816 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); |
f8214865 | 1817 | |
335fbe0f ML |
1818 | batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig, |
1819 | req_src, BATADV_TVLV_TT, 1, | |
1820 | tvlv_tt_data, sizeof(*tvlv_tt_data) + tt_len); | |
e91ecfc6 | 1821 | |
335fbe0f | 1822 | ret = true; |
a73105b8 AQ |
1823 | goto out; |
1824 | ||
1825 | unlock: | |
1826 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1827 | ||
1828 | out: | |
1829 | if (res_dst_orig_node) | |
7d211efc | 1830 | batadv_orig_node_free_ref(res_dst_orig_node); |
a73105b8 | 1831 | if (req_dst_orig_node) |
7d211efc | 1832 | batadv_orig_node_free_ref(req_dst_orig_node); |
335fbe0f | 1833 | kfree(tvlv_tt_data); |
a73105b8 | 1834 | return ret; |
a73105b8 | 1835 | } |
96412690 | 1836 | |
335fbe0f ML |
1837 | /** |
1838 | * batadv_send_my_tt_response - send reply to tt request concerning this node's | |
1839 | * translation table | |
1840 | * @bat_priv: the bat priv with all the soft interface information | |
1841 | * @tt_data: tt data containing the tt request information | |
1842 | * @req_src: mac address of tt request sender | |
1843 | * | |
1844 | * Returns true if tt request reply was sent, false otherwise. | |
1845 | */ | |
1846 | static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv, | |
1847 | struct batadv_tvlv_tt_data *tt_data, | |
1848 | uint8_t *req_src) | |
a73105b8 | 1849 | { |
335fbe0f | 1850 | struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; |
170173bf | 1851 | struct batadv_orig_node *orig_node; |
56303d34 | 1852 | struct batadv_hard_iface *primary_if = NULL; |
335fbe0f | 1853 | uint8_t my_ttvn, req_ttvn; |
a73105b8 | 1854 | bool full_table; |
335fbe0f | 1855 | uint16_t tt_len; |
a73105b8 | 1856 | |
39c75a51 | 1857 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 1858 | "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", |
335fbe0f ML |
1859 | req_src, tt_data->ttvn, |
1860 | (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); | |
a73105b8 AQ |
1861 | |
1862 | ||
807736f6 | 1863 | my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); |
335fbe0f | 1864 | req_ttvn = tt_data->ttvn; |
a73105b8 | 1865 | |
335fbe0f | 1866 | orig_node = batadv_orig_hash_find(bat_priv, req_src); |
a73105b8 AQ |
1867 | if (!orig_node) |
1868 | goto out; | |
1869 | ||
e5d89254 | 1870 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1871 | if (!primary_if) |
1872 | goto out; | |
1873 | ||
1874 | /* If the full table has been explicitly requested or the gap | |
9cfc7bd6 SE |
1875 | * is too big send the whole local translation table |
1876 | */ | |
335fbe0f | 1877 | if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn || |
807736f6 | 1878 | !bat_priv->tt.last_changeset) |
a73105b8 AQ |
1879 | full_table = true; |
1880 | else | |
1881 | full_table = false; | |
1882 | ||
335fbe0f ML |
1883 | /* TT fragmentation hasn't been implemented yet, so send as many |
1884 | * TT entries fit a single packet as possible only | |
9cfc7bd6 | 1885 | */ |
a73105b8 | 1886 | if (!full_table) { |
807736f6 SE |
1887 | spin_lock_bh(&bat_priv->tt.last_changeset_lock); |
1888 | tt_len = bat_priv->tt.last_changeset_len; | |
a73105b8 | 1889 | |
335fbe0f ML |
1890 | tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data) + tt_len, |
1891 | GFP_ATOMIC); | |
1892 | if (!tvlv_tt_data) | |
a73105b8 AQ |
1893 | goto unlock; |
1894 | ||
335fbe0f ML |
1895 | /* Copy the last orig_node's OGM buffer */ |
1896 | memcpy(tvlv_tt_data + 1, bat_priv->tt.last_changeset, | |
807736f6 SE |
1897 | bat_priv->tt.last_changeset_len); |
1898 | spin_unlock_bh(&bat_priv->tt.last_changeset_lock); | |
a73105b8 | 1899 | } else { |
807736f6 | 1900 | tt_len = (uint16_t)atomic_read(&bat_priv->tt.local_entry_num); |
335fbe0f ML |
1901 | tt_len = batadv_tt_len(tt_len); |
1902 | req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
1903 | ||
1904 | tvlv_tt_data = batadv_tt_tvlv_generate(bat_priv, | |
1905 | bat_priv->tt.local_hash, | |
1906 | tt_len, | |
1907 | batadv_tt_local_valid, | |
1908 | NULL); | |
1909 | if (!tvlv_tt_data) | |
a73105b8 | 1910 | goto out; |
a73105b8 AQ |
1911 | } |
1912 | ||
335fbe0f ML |
1913 | tvlv_tt_data->flags = BATADV_TT_RESPONSE; |
1914 | tvlv_tt_data->ttvn = req_ttvn; | |
a73105b8 AQ |
1915 | |
1916 | if (full_table) | |
335fbe0f | 1917 | tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1918 | |
39c75a51 | 1919 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
335fbe0f ML |
1920 | "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n", |
1921 | orig_node->orig, full_table ? 'F' : '.', req_ttvn); | |
a73105b8 | 1922 | |
d69909d2 | 1923 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); |
f8214865 | 1924 | |
335fbe0f ML |
1925 | batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr, |
1926 | req_src, BATADV_TVLV_TT, 1, | |
1927 | tvlv_tt_data, sizeof(*tvlv_tt_data) + tt_len); | |
1928 | ||
a73105b8 AQ |
1929 | goto out; |
1930 | ||
1931 | unlock: | |
807736f6 | 1932 | spin_unlock_bh(&bat_priv->tt.last_changeset_lock); |
a73105b8 AQ |
1933 | out: |
1934 | if (orig_node) | |
7d211efc | 1935 | batadv_orig_node_free_ref(orig_node); |
a73105b8 | 1936 | if (primary_if) |
e5d89254 | 1937 | batadv_hardif_free_ref(primary_if); |
335fbe0f ML |
1938 | kfree(tvlv_tt_data); |
1939 | /* The packet was for this host, so it doesn't need to be re-routed */ | |
a73105b8 AQ |
1940 | return true; |
1941 | } | |
1942 | ||
335fbe0f ML |
1943 | /** |
1944 | * batadv_send_tt_response - send reply to tt request | |
1945 | * @bat_priv: the bat priv with all the soft interface information | |
1946 | * @tt_data: tt data containing the tt request information | |
1947 | * @req_src: mac address of tt request sender | |
1948 | * @req_dst: mac address of tt request recipient | |
1949 | * | |
1950 | * Returns true if tt request reply was sent, false otherwise. | |
1951 | */ | |
1952 | static bool batadv_send_tt_response(struct batadv_priv *bat_priv, | |
1953 | struct batadv_tvlv_tt_data *tt_data, | |
1954 | uint8_t *req_src, uint8_t *req_dst) | |
a73105b8 | 1955 | { |
335fbe0f | 1956 | if (batadv_is_my_mac(bat_priv, req_dst)) { |
20ff9d59 | 1957 | /* don't answer backbone gws! */ |
335fbe0f | 1958 | if (batadv_bla_is_backbone_gw_orig(bat_priv, req_src)) |
20ff9d59 SW |
1959 | return true; |
1960 | ||
335fbe0f | 1961 | return batadv_send_my_tt_response(bat_priv, tt_data, req_src); |
20ff9d59 | 1962 | } else { |
335fbe0f ML |
1963 | return batadv_send_other_tt_response(bat_priv, tt_data, |
1964 | req_src, req_dst); | |
20ff9d59 | 1965 | } |
a73105b8 AQ |
1966 | } |
1967 | ||
56303d34 SE |
1968 | static void _batadv_tt_update_changes(struct batadv_priv *bat_priv, |
1969 | struct batadv_orig_node *orig_node, | |
335fbe0f | 1970 | struct batadv_tvlv_tt_change *tt_change, |
a513088d | 1971 | uint16_t tt_num_changes, uint8_t ttvn) |
a73105b8 AQ |
1972 | { |
1973 | int i; | |
a513088d | 1974 | int roams; |
a73105b8 AQ |
1975 | |
1976 | for (i = 0; i < tt_num_changes; i++) { | |
acd34afa SE |
1977 | if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) { |
1978 | roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM; | |
a513088d SE |
1979 | batadv_tt_global_del(bat_priv, orig_node, |
1980 | (tt_change + i)->addr, | |
d4f44692 AQ |
1981 | "tt removed by changes", |
1982 | roams); | |
08c36d3e | 1983 | } else { |
08c36d3e | 1984 | if (!batadv_tt_global_add(bat_priv, orig_node, |
d4f44692 AQ |
1985 | (tt_change + i)->addr, |
1986 | (tt_change + i)->flags, ttvn)) | |
a73105b8 AQ |
1987 | /* In case of problem while storing a |
1988 | * global_entry, we stop the updating | |
1989 | * procedure without committing the | |
1990 | * ttvn change. This will avoid to send | |
1991 | * corrupted data on tt_request | |
1992 | */ | |
1993 | return; | |
08c36d3e | 1994 | } |
a73105b8 | 1995 | } |
17071578 | 1996 | orig_node->tt_initialised = true; |
a73105b8 AQ |
1997 | } |
1998 | ||
56303d34 | 1999 | static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv, |
335fbe0f ML |
2000 | struct batadv_tvlv_tt_data *tt_data, |
2001 | uint8_t *resp_src, uint16_t num_entries) | |
a73105b8 | 2002 | { |
170173bf | 2003 | struct batadv_orig_node *orig_node; |
a73105b8 | 2004 | |
335fbe0f | 2005 | orig_node = batadv_orig_hash_find(bat_priv, resp_src); |
a73105b8 AQ |
2006 | if (!orig_node) |
2007 | goto out; | |
2008 | ||
2009 | /* Purge the old table first.. */ | |
08c36d3e | 2010 | batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table"); |
a73105b8 | 2011 | |
a513088d | 2012 | _batadv_tt_update_changes(bat_priv, orig_node, |
335fbe0f ML |
2013 | (struct batadv_tvlv_tt_change *)(tt_data + 1), |
2014 | num_entries, tt_data->ttvn); | |
a73105b8 AQ |
2015 | |
2016 | spin_lock_bh(&orig_node->tt_buff_lock); | |
2017 | kfree(orig_node->tt_buff); | |
2018 | orig_node->tt_buff_len = 0; | |
2019 | orig_node->tt_buff = NULL; | |
2020 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
2021 | ||
335fbe0f | 2022 | atomic_set(&orig_node->last_ttvn, tt_data->ttvn); |
a73105b8 AQ |
2023 | |
2024 | out: | |
2025 | if (orig_node) | |
7d211efc | 2026 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
2027 | } |
2028 | ||
56303d34 SE |
2029 | static void batadv_tt_update_changes(struct batadv_priv *bat_priv, |
2030 | struct batadv_orig_node *orig_node, | |
a513088d | 2031 | uint16_t tt_num_changes, uint8_t ttvn, |
335fbe0f | 2032 | struct batadv_tvlv_tt_change *tt_change) |
a73105b8 | 2033 | { |
a513088d SE |
2034 | _batadv_tt_update_changes(bat_priv, orig_node, tt_change, |
2035 | tt_num_changes, ttvn); | |
a73105b8 | 2036 | |
a513088d SE |
2037 | batadv_tt_save_orig_buffer(bat_priv, orig_node, |
2038 | (unsigned char *)tt_change, tt_num_changes); | |
a73105b8 AQ |
2039 | atomic_set(&orig_node->last_ttvn, ttvn); |
2040 | } | |
2041 | ||
56303d34 | 2042 | bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr) |
a73105b8 | 2043 | { |
170173bf | 2044 | struct batadv_tt_local_entry *tt_local_entry; |
7683fdc1 | 2045 | bool ret = false; |
a73105b8 | 2046 | |
a513088d | 2047 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
2048 | if (!tt_local_entry) |
2049 | goto out; | |
058d0e26 | 2050 | /* Check if the client has been logically deleted (but is kept for |
9cfc7bd6 SE |
2051 | * consistency purpose) |
2052 | */ | |
7c1fd91d AQ |
2053 | if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) || |
2054 | (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM)) | |
058d0e26 | 2055 | goto out; |
7683fdc1 AQ |
2056 | ret = true; |
2057 | out: | |
a73105b8 | 2058 | if (tt_local_entry) |
a513088d | 2059 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7683fdc1 | 2060 | return ret; |
a73105b8 AQ |
2061 | } |
2062 | ||
335fbe0f ML |
2063 | /** |
2064 | * batadv_handle_tt_response - process incoming tt reply | |
2065 | * @bat_priv: the bat priv with all the soft interface information | |
2066 | * @tt_data: tt data containing the tt request information | |
2067 | * @resp_src: mac address of tt reply sender | |
2068 | * @num_entries: number of tt change entries appended to the tt data | |
2069 | */ | |
2070 | static void batadv_handle_tt_response(struct batadv_priv *bat_priv, | |
2071 | struct batadv_tvlv_tt_data *tt_data, | |
2072 | uint8_t *resp_src, uint16_t num_entries) | |
a73105b8 | 2073 | { |
56303d34 SE |
2074 | struct batadv_tt_req_node *node, *safe; |
2075 | struct batadv_orig_node *orig_node = NULL; | |
335fbe0f | 2076 | struct batadv_tvlv_tt_change *tt_change; |
a73105b8 | 2077 | |
39c75a51 | 2078 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 2079 | "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", |
335fbe0f ML |
2080 | resp_src, tt_data->ttvn, num_entries, |
2081 | (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); | |
a73105b8 | 2082 | |
20ff9d59 | 2083 | /* we should have never asked a backbone gw */ |
335fbe0f | 2084 | if (batadv_bla_is_backbone_gw_orig(bat_priv, resp_src)) |
20ff9d59 SW |
2085 | goto out; |
2086 | ||
335fbe0f | 2087 | orig_node = batadv_orig_hash_find(bat_priv, resp_src); |
a73105b8 AQ |
2088 | if (!orig_node) |
2089 | goto out; | |
2090 | ||
335fbe0f ML |
2091 | if (tt_data->flags & BATADV_TT_FULL_TABLE) { |
2092 | batadv_tt_fill_gtable(bat_priv, tt_data, resp_src, num_entries); | |
96412690 | 2093 | } else { |
335fbe0f ML |
2094 | tt_change = (struct batadv_tvlv_tt_change *)(tt_data + 1); |
2095 | batadv_tt_update_changes(bat_priv, orig_node, num_entries, | |
2096 | tt_data->ttvn, tt_change); | |
96412690 | 2097 | } |
a73105b8 AQ |
2098 | |
2099 | /* Delete the tt_req_node from pending tt_requests list */ | |
807736f6 SE |
2100 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
2101 | list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { | |
335fbe0f | 2102 | if (!batadv_compare_eth(node->addr, resp_src)) |
a73105b8 AQ |
2103 | continue; |
2104 | list_del(&node->list); | |
2105 | kfree(node); | |
2106 | } | |
807736f6 | 2107 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
2108 | |
2109 | /* Recalculate the CRC for this orig_node and store it */ | |
a513088d | 2110 | orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); |
a73105b8 AQ |
2111 | out: |
2112 | if (orig_node) | |
7d211efc | 2113 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
2114 | } |
2115 | ||
56303d34 | 2116 | static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv) |
a73105b8 | 2117 | { |
56303d34 | 2118 | struct batadv_tt_roam_node *node, *safe; |
a73105b8 | 2119 | |
807736f6 | 2120 | spin_lock_bh(&bat_priv->tt.roam_list_lock); |
a73105b8 | 2121 | |
807736f6 | 2122 | list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { |
cc47f66e AQ |
2123 | list_del(&node->list); |
2124 | kfree(node); | |
2125 | } | |
2126 | ||
807736f6 | 2127 | spin_unlock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e AQ |
2128 | } |
2129 | ||
56303d34 | 2130 | static void batadv_tt_roam_purge(struct batadv_priv *bat_priv) |
cc47f66e | 2131 | { |
56303d34 | 2132 | struct batadv_tt_roam_node *node, *safe; |
cc47f66e | 2133 | |
807736f6 SE |
2134 | spin_lock_bh(&bat_priv->tt.roam_list_lock); |
2135 | list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { | |
42d0b044 SE |
2136 | if (!batadv_has_timed_out(node->first_time, |
2137 | BATADV_ROAMING_MAX_TIME)) | |
cc47f66e AQ |
2138 | continue; |
2139 | ||
2140 | list_del(&node->list); | |
2141 | kfree(node); | |
2142 | } | |
807736f6 | 2143 | spin_unlock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e AQ |
2144 | } |
2145 | ||
2146 | /* This function checks whether the client already reached the | |
2147 | * maximum number of possible roaming phases. In this case the ROAMING_ADV | |
2148 | * will not be sent. | |
2149 | * | |
9cfc7bd6 SE |
2150 | * returns true if the ROAMING_ADV can be sent, false otherwise |
2151 | */ | |
56303d34 | 2152 | static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, |
a513088d | 2153 | uint8_t *client) |
cc47f66e | 2154 | { |
56303d34 | 2155 | struct batadv_tt_roam_node *tt_roam_node; |
cc47f66e AQ |
2156 | bool ret = false; |
2157 | ||
807736f6 | 2158 | spin_lock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e | 2159 | /* The new tt_req will be issued only if I'm not waiting for a |
9cfc7bd6 SE |
2160 | * reply from the same orig_node yet |
2161 | */ | |
807736f6 | 2162 | list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) { |
1eda58bf | 2163 | if (!batadv_compare_eth(tt_roam_node->addr, client)) |
cc47f66e AQ |
2164 | continue; |
2165 | ||
1eda58bf | 2166 | if (batadv_has_timed_out(tt_roam_node->first_time, |
42d0b044 | 2167 | BATADV_ROAMING_MAX_TIME)) |
cc47f66e AQ |
2168 | continue; |
2169 | ||
3e34819e | 2170 | if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter)) |
cc47f66e AQ |
2171 | /* Sorry, you roamed too many times! */ |
2172 | goto unlock; | |
2173 | ret = true; | |
2174 | break; | |
2175 | } | |
2176 | ||
2177 | if (!ret) { | |
2178 | tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); | |
2179 | if (!tt_roam_node) | |
2180 | goto unlock; | |
2181 | ||
2182 | tt_roam_node->first_time = jiffies; | |
42d0b044 SE |
2183 | atomic_set(&tt_roam_node->counter, |
2184 | BATADV_ROAMING_MAX_COUNT - 1); | |
cc47f66e AQ |
2185 | memcpy(tt_roam_node->addr, client, ETH_ALEN); |
2186 | ||
807736f6 | 2187 | list_add(&tt_roam_node->list, &bat_priv->tt.roam_list); |
cc47f66e AQ |
2188 | ret = true; |
2189 | } | |
2190 | ||
2191 | unlock: | |
807736f6 | 2192 | spin_unlock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e AQ |
2193 | return ret; |
2194 | } | |
2195 | ||
56303d34 SE |
2196 | static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, |
2197 | struct batadv_orig_node *orig_node) | |
cc47f66e | 2198 | { |
56303d34 | 2199 | struct batadv_hard_iface *primary_if; |
122edaa0 ML |
2200 | struct batadv_tvlv_roam_adv tvlv_roam; |
2201 | ||
2202 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2203 | if (!primary_if) | |
2204 | goto out; | |
cc47f66e AQ |
2205 | |
2206 | /* before going on we have to check whether the client has | |
9cfc7bd6 SE |
2207 | * already roamed to us too many times |
2208 | */ | |
a513088d | 2209 | if (!batadv_tt_check_roam_count(bat_priv, client)) |
cc47f66e AQ |
2210 | goto out; |
2211 | ||
39c75a51 | 2212 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
bb351ba0 MH |
2213 | "Sending ROAMING_ADV to %pM (client %pM)\n", |
2214 | orig_node->orig, client); | |
cc47f66e | 2215 | |
d69909d2 | 2216 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX); |
f8214865 | 2217 | |
122edaa0 ML |
2218 | memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client)); |
2219 | tvlv_roam.reserved = 0; | |
2220 | ||
2221 | batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr, | |
2222 | orig_node->orig, BATADV_TVLV_ROAM, 1, | |
2223 | &tvlv_roam, sizeof(tvlv_roam)); | |
cc47f66e AQ |
2224 | |
2225 | out: | |
122edaa0 ML |
2226 | if (primary_if) |
2227 | batadv_hardif_free_ref(primary_if); | |
a73105b8 AQ |
2228 | } |
2229 | ||
a513088d | 2230 | static void batadv_tt_purge(struct work_struct *work) |
a73105b8 | 2231 | { |
56303d34 | 2232 | struct delayed_work *delayed_work; |
807736f6 | 2233 | struct batadv_priv_tt *priv_tt; |
56303d34 SE |
2234 | struct batadv_priv *bat_priv; |
2235 | ||
2236 | delayed_work = container_of(work, struct delayed_work, work); | |
807736f6 SE |
2237 | priv_tt = container_of(delayed_work, struct batadv_priv_tt, work); |
2238 | bat_priv = container_of(priv_tt, struct batadv_priv, tt); | |
a73105b8 | 2239 | |
a513088d | 2240 | batadv_tt_local_purge(bat_priv); |
30cfd02b | 2241 | batadv_tt_global_purge(bat_priv); |
a513088d SE |
2242 | batadv_tt_req_purge(bat_priv); |
2243 | batadv_tt_roam_purge(bat_priv); | |
a73105b8 | 2244 | |
72414442 AQ |
2245 | queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work, |
2246 | msecs_to_jiffies(BATADV_TT_WORK_PERIOD)); | |
a73105b8 | 2247 | } |
cc47f66e | 2248 | |
56303d34 | 2249 | void batadv_tt_free(struct batadv_priv *bat_priv) |
cc47f66e | 2250 | { |
e1bf0c14 ML |
2251 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1); |
2252 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1); | |
2253 | ||
807736f6 | 2254 | cancel_delayed_work_sync(&bat_priv->tt.work); |
cc47f66e | 2255 | |
a513088d SE |
2256 | batadv_tt_local_table_free(bat_priv); |
2257 | batadv_tt_global_table_free(bat_priv); | |
2258 | batadv_tt_req_list_free(bat_priv); | |
2259 | batadv_tt_changes_list_free(bat_priv); | |
2260 | batadv_tt_roam_list_free(bat_priv); | |
cc47f66e | 2261 | |
807736f6 | 2262 | kfree(bat_priv->tt.last_changeset); |
cc47f66e | 2263 | } |
058d0e26 | 2264 | |
697f2531 | 2265 | /* This function will enable or disable the specified flags for all the entries |
9cfc7bd6 SE |
2266 | * in the given hash table and returns the number of modified entries |
2267 | */ | |
5bf74e9c SE |
2268 | static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash, |
2269 | uint16_t flags, bool enable) | |
058d0e26 | 2270 | { |
c90681b8 | 2271 | uint32_t i; |
697f2531 | 2272 | uint16_t changed_num = 0; |
058d0e26 | 2273 | struct hlist_head *head; |
56303d34 | 2274 | struct batadv_tt_common_entry *tt_common_entry; |
058d0e26 AQ |
2275 | |
2276 | if (!hash) | |
697f2531 | 2277 | goto out; |
058d0e26 AQ |
2278 | |
2279 | for (i = 0; i < hash->size; i++) { | |
2280 | head = &hash->table[i]; | |
2281 | ||
2282 | rcu_read_lock(); | |
b67bfe0d | 2283 | hlist_for_each_entry_rcu(tt_common_entry, |
058d0e26 | 2284 | head, hash_entry) { |
697f2531 AQ |
2285 | if (enable) { |
2286 | if ((tt_common_entry->flags & flags) == flags) | |
2287 | continue; | |
2288 | tt_common_entry->flags |= flags; | |
2289 | } else { | |
2290 | if (!(tt_common_entry->flags & flags)) | |
2291 | continue; | |
2292 | tt_common_entry->flags &= ~flags; | |
2293 | } | |
2294 | changed_num++; | |
058d0e26 AQ |
2295 | } |
2296 | rcu_read_unlock(); | |
2297 | } | |
697f2531 AQ |
2298 | out: |
2299 | return changed_num; | |
058d0e26 AQ |
2300 | } |
2301 | ||
acd34afa | 2302 | /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */ |
56303d34 | 2303 | static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) |
058d0e26 | 2304 | { |
807736f6 | 2305 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
56303d34 SE |
2306 | struct batadv_tt_common_entry *tt_common; |
2307 | struct batadv_tt_local_entry *tt_local; | |
b67bfe0d | 2308 | struct hlist_node *node_tmp; |
058d0e26 AQ |
2309 | struct hlist_head *head; |
2310 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
c90681b8 | 2311 | uint32_t i; |
058d0e26 AQ |
2312 | |
2313 | if (!hash) | |
2314 | return; | |
2315 | ||
2316 | for (i = 0; i < hash->size; i++) { | |
2317 | head = &hash->table[i]; | |
2318 | list_lock = &hash->list_locks[i]; | |
2319 | ||
2320 | spin_lock_bh(list_lock); | |
b67bfe0d | 2321 | hlist_for_each_entry_safe(tt_common, node_tmp, head, |
acd34afa SE |
2322 | hash_entry) { |
2323 | if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING)) | |
058d0e26 AQ |
2324 | continue; |
2325 | ||
39c75a51 | 2326 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 2327 | "Deleting local tt entry (%pM): pending\n", |
acd34afa | 2328 | tt_common->addr); |
058d0e26 | 2329 | |
807736f6 | 2330 | atomic_dec(&bat_priv->tt.local_entry_num); |
b67bfe0d | 2331 | hlist_del_rcu(&tt_common->hash_entry); |
56303d34 SE |
2332 | tt_local = container_of(tt_common, |
2333 | struct batadv_tt_local_entry, | |
2334 | common); | |
2335 | batadv_tt_local_entry_free_ref(tt_local); | |
058d0e26 AQ |
2336 | } |
2337 | spin_unlock_bh(list_lock); | |
2338 | } | |
058d0e26 AQ |
2339 | } |
2340 | ||
e1bf0c14 ML |
2341 | /** |
2342 | * batadv_tt_local_commit_changes - commit all pending local tt changes which | |
2343 | * have been queued in the time since the last commit | |
2344 | * @bat_priv: the bat priv with all the soft interface information | |
2345 | */ | |
2346 | void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv) | |
058d0e26 | 2347 | { |
be9aa4c1 ML |
2348 | uint16_t changed_num = 0; |
2349 | ||
e1bf0c14 ML |
2350 | if (atomic_read(&bat_priv->tt.local_changes) < 1) { |
2351 | if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt)) | |
2352 | batadv_tt_tvlv_container_update(bat_priv); | |
2353 | return; | |
2354 | } | |
be9aa4c1 | 2355 | |
807736f6 | 2356 | changed_num = batadv_tt_set_flags(bat_priv->tt.local_hash, |
acd34afa | 2357 | BATADV_TT_CLIENT_NEW, false); |
be9aa4c1 ML |
2358 | |
2359 | /* all reset entries have to be counted as local entries */ | |
807736f6 | 2360 | atomic_add(changed_num, &bat_priv->tt.local_entry_num); |
a513088d | 2361 | batadv_tt_local_purge_pending_clients(bat_priv); |
807736f6 | 2362 | bat_priv->tt.local_crc = batadv_tt_local_crc(bat_priv); |
058d0e26 AQ |
2363 | |
2364 | /* Increment the TTVN only once per OGM interval */ | |
807736f6 | 2365 | atomic_inc(&bat_priv->tt.vn); |
39c75a51 | 2366 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 2367 | "Local changes committed, updating to ttvn %u\n", |
807736f6 | 2368 | (uint8_t)atomic_read(&bat_priv->tt.vn)); |
be9aa4c1 ML |
2369 | |
2370 | /* reset the sending counter */ | |
807736f6 | 2371 | atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX); |
e1bf0c14 | 2372 | batadv_tt_tvlv_container_update(bat_priv); |
058d0e26 | 2373 | } |
59b699cd | 2374 | |
56303d34 | 2375 | bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src, |
08c36d3e | 2376 | uint8_t *dst) |
59b699cd | 2377 | { |
56303d34 SE |
2378 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
2379 | struct batadv_tt_global_entry *tt_global_entry = NULL; | |
5870adc6 | 2380 | bool ret = false; |
59b699cd AQ |
2381 | |
2382 | if (!atomic_read(&bat_priv->ap_isolation)) | |
5870adc6 | 2383 | goto out; |
59b699cd | 2384 | |
a513088d | 2385 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst); |
59b699cd AQ |
2386 | if (!tt_local_entry) |
2387 | goto out; | |
2388 | ||
a513088d | 2389 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, src); |
59b699cd AQ |
2390 | if (!tt_global_entry) |
2391 | goto out; | |
2392 | ||
1f129fef | 2393 | if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) |
59b699cd AQ |
2394 | goto out; |
2395 | ||
5870adc6 | 2396 | ret = true; |
59b699cd AQ |
2397 | |
2398 | out: | |
2399 | if (tt_global_entry) | |
a513088d | 2400 | batadv_tt_global_entry_free_ref(tt_global_entry); |
59b699cd | 2401 | if (tt_local_entry) |
a513088d | 2402 | batadv_tt_local_entry_free_ref(tt_local_entry); |
59b699cd AQ |
2403 | return ret; |
2404 | } | |
a943cac1 | 2405 | |
e1bf0c14 ML |
2406 | /** |
2407 | * batadv_tt_update_orig - update global translation table with new tt | |
2408 | * information received via ogms | |
2409 | * @bat_priv: the bat priv with all the soft interface information | |
2410 | * @orig: the orig_node of the ogm | |
2411 | * @tt_buff: buffer holding the tt information | |
2412 | * @tt_num_changes: number of tt changes inside the tt buffer | |
2413 | * @ttvn: translation table version number of this changeset | |
ced72933 | 2414 | * @tt_crc: crc32 checksum of orig node's translation table |
e1bf0c14 ML |
2415 | */ |
2416 | static void batadv_tt_update_orig(struct batadv_priv *bat_priv, | |
2417 | struct batadv_orig_node *orig_node, | |
2418 | const unsigned char *tt_buff, | |
2419 | uint16_t tt_num_changes, uint8_t ttvn, | |
ced72933 | 2420 | uint32_t tt_crc) |
a943cac1 ML |
2421 | { |
2422 | uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
2423 | bool full_table = true; | |
335fbe0f | 2424 | struct batadv_tvlv_tt_change *tt_change; |
a943cac1 | 2425 | |
20ff9d59 | 2426 | /* don't care about a backbone gateways updates. */ |
08adf151 | 2427 | if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) |
20ff9d59 SW |
2428 | return; |
2429 | ||
17071578 | 2430 | /* orig table not initialised AND first diff is in the OGM OR the ttvn |
9cfc7bd6 SE |
2431 | * increased by one -> we can apply the attached changes |
2432 | */ | |
17071578 AQ |
2433 | if ((!orig_node->tt_initialised && ttvn == 1) || |
2434 | ttvn - orig_ttvn == 1) { | |
a943cac1 | 2435 | /* the OGM could not contain the changes due to their size or |
42d0b044 SE |
2436 | * because they have already been sent BATADV_TT_OGM_APPEND_MAX |
2437 | * times. | |
9cfc7bd6 SE |
2438 | * In this case send a tt request |
2439 | */ | |
a943cac1 ML |
2440 | if (!tt_num_changes) { |
2441 | full_table = false; | |
2442 | goto request_table; | |
2443 | } | |
2444 | ||
335fbe0f | 2445 | tt_change = (struct batadv_tvlv_tt_change *)tt_buff; |
a513088d | 2446 | batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes, |
96412690 | 2447 | ttvn, tt_change); |
a943cac1 ML |
2448 | |
2449 | /* Even if we received the precomputed crc with the OGM, we | |
2450 | * prefer to recompute it to spot any possible inconsistency | |
9cfc7bd6 SE |
2451 | * in the global table |
2452 | */ | |
a513088d | 2453 | orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); |
a943cac1 ML |
2454 | |
2455 | /* The ttvn alone is not enough to guarantee consistency | |
2456 | * because a single value could represent different states | |
2457 | * (due to the wrap around). Thus a node has to check whether | |
2458 | * the resulting table (after applying the changes) is still | |
2459 | * consistent or not. E.g. a node could disconnect while its | |
2460 | * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case | |
2461 | * checking the CRC value is mandatory to detect the | |
9cfc7bd6 SE |
2462 | * inconsistency |
2463 | */ | |
a943cac1 ML |
2464 | if (orig_node->tt_crc != tt_crc) |
2465 | goto request_table; | |
a943cac1 ML |
2466 | } else { |
2467 | /* if we missed more than one change or our tables are not | |
9cfc7bd6 SE |
2468 | * in sync anymore -> request fresh tt data |
2469 | */ | |
17071578 AQ |
2470 | if (!orig_node->tt_initialised || ttvn != orig_ttvn || |
2471 | orig_node->tt_crc != tt_crc) { | |
a943cac1 | 2472 | request_table: |
39c75a51 | 2473 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
ced72933 | 2474 | "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %#.8x last_crc: %#.8x num_changes: %u)\n", |
1eda58bf SE |
2475 | orig_node->orig, ttvn, orig_ttvn, tt_crc, |
2476 | orig_node->tt_crc, tt_num_changes); | |
a513088d SE |
2477 | batadv_send_tt_request(bat_priv, orig_node, ttvn, |
2478 | tt_crc, full_table); | |
a943cac1 ML |
2479 | return; |
2480 | } | |
2481 | } | |
2482 | } | |
3275e7cc AQ |
2483 | |
2484 | /* returns true whether we know that the client has moved from its old | |
2485 | * originator to another one. This entry is kept is still kept for consistency | |
2486 | * purposes | |
2487 | */ | |
56303d34 | 2488 | bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv, |
08c36d3e | 2489 | uint8_t *addr) |
3275e7cc | 2490 | { |
56303d34 | 2491 | struct batadv_tt_global_entry *tt_global_entry; |
3275e7cc AQ |
2492 | bool ret = false; |
2493 | ||
a513088d | 2494 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
3275e7cc AQ |
2495 | if (!tt_global_entry) |
2496 | goto out; | |
2497 | ||
c1d07431 | 2498 | ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM; |
a513088d | 2499 | batadv_tt_global_entry_free_ref(tt_global_entry); |
3275e7cc AQ |
2500 | out: |
2501 | return ret; | |
2502 | } | |
30cfd02b | 2503 | |
7c1fd91d AQ |
2504 | /** |
2505 | * batadv_tt_local_client_is_roaming - tells whether the client is roaming | |
2506 | * @bat_priv: the bat priv with all the soft interface information | |
2507 | * @addr: the MAC address of the local client to query | |
2508 | * | |
2509 | * Returns true if the local client is known to be roaming (it is not served by | |
2510 | * this node anymore) or not. If yes, the client is still present in the table | |
2511 | * to keep the latter consistent with the node TTVN | |
2512 | */ | |
2513 | bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv, | |
2514 | uint8_t *addr) | |
2515 | { | |
2516 | struct batadv_tt_local_entry *tt_local_entry; | |
2517 | bool ret = false; | |
2518 | ||
2519 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); | |
2520 | if (!tt_local_entry) | |
2521 | goto out; | |
2522 | ||
2523 | ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM; | |
2524 | batadv_tt_local_entry_free_ref(tt_local_entry); | |
2525 | out: | |
2526 | return ret; | |
7c1fd91d AQ |
2527 | } |
2528 | ||
30cfd02b AQ |
2529 | bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv, |
2530 | struct batadv_orig_node *orig_node, | |
2531 | const unsigned char *addr) | |
2532 | { | |
2533 | bool ret = false; | |
2534 | ||
1f36aebc AQ |
2535 | /* if the originator is a backbone node (meaning it belongs to the same |
2536 | * LAN of this node) the temporary client must not be added because to | |
2537 | * reach such destination the node must use the LAN instead of the mesh | |
2538 | */ | |
2539 | if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) | |
2540 | goto out; | |
2541 | ||
30cfd02b AQ |
2542 | if (!batadv_tt_global_add(bat_priv, orig_node, addr, |
2543 | BATADV_TT_CLIENT_TEMP, | |
2544 | atomic_read(&orig_node->last_ttvn))) | |
2545 | goto out; | |
2546 | ||
2547 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
2548 | "Added temporary global client (addr: %pM orig: %pM)\n", | |
2549 | addr, orig_node->orig); | |
2550 | ret = true; | |
2551 | out: | |
2552 | return ret; | |
2553 | } | |
e1bf0c14 ML |
2554 | |
2555 | /** | |
2556 | * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container | |
2557 | * @bat_priv: the bat priv with all the soft interface information | |
2558 | * @orig: the orig_node of the ogm | |
2559 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
2560 | * @tvlv_value: tvlv buffer containing the gateway data | |
2561 | * @tvlv_value_len: tvlv buffer length | |
2562 | */ | |
2563 | static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, | |
2564 | struct batadv_orig_node *orig, | |
2565 | uint8_t flags, | |
2566 | void *tvlv_value, | |
2567 | uint16_t tvlv_value_len) | |
2568 | { | |
2569 | struct batadv_tvlv_tt_data *tt_data; | |
2570 | uint16_t num_entries; | |
2571 | ||
2572 | if (tvlv_value_len < sizeof(*tt_data)) | |
2573 | return; | |
2574 | ||
2575 | tt_data = (struct batadv_tvlv_tt_data *)tvlv_value; | |
2576 | tvlv_value_len -= sizeof(*tt_data); | |
2577 | ||
2578 | num_entries = tvlv_value_len / batadv_tt_len(1); | |
2579 | ||
2580 | batadv_tt_update_orig(bat_priv, orig, | |
2581 | (unsigned char *)(tt_data + 1), | |
ced72933 | 2582 | num_entries, tt_data->ttvn, ntohl(tt_data->crc)); |
e1bf0c14 ML |
2583 | } |
2584 | ||
335fbe0f ML |
2585 | /** |
2586 | * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv | |
2587 | * container | |
2588 | * @bat_priv: the bat priv with all the soft interface information | |
2589 | * @src: mac address of tt tvlv sender | |
2590 | * @dst: mac address of tt tvlv recipient | |
2591 | * @tvlv_value: tvlv buffer containing the tt data | |
2592 | * @tvlv_value_len: tvlv buffer length | |
2593 | * | |
2594 | * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS | |
2595 | * otherwise. | |
2596 | */ | |
2597 | static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, | |
2598 | uint8_t *src, uint8_t *dst, | |
2599 | void *tvlv_value, | |
2600 | uint16_t tvlv_value_len) | |
2601 | { | |
2602 | struct batadv_tvlv_tt_data *tt_data; | |
2603 | uint16_t num_entries; | |
2604 | char tt_flag; | |
2605 | bool ret; | |
2606 | ||
2607 | if (tvlv_value_len < sizeof(*tt_data)) | |
2608 | return NET_RX_SUCCESS; | |
2609 | ||
2610 | tt_data = (struct batadv_tvlv_tt_data *)tvlv_value; | |
2611 | tvlv_value_len -= sizeof(*tt_data); | |
2612 | ||
2613 | num_entries = tvlv_value_len / batadv_tt_len(1); | |
2614 | ||
2615 | switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) { | |
2616 | case BATADV_TT_REQUEST: | |
2617 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX); | |
2618 | ||
2619 | /* If this node cannot provide a TT response the tt_request is | |
2620 | * forwarded | |
2621 | */ | |
2622 | ret = batadv_send_tt_response(bat_priv, tt_data, src, dst); | |
2623 | if (!ret) { | |
2624 | if (tt_data->flags & BATADV_TT_FULL_TABLE) | |
2625 | tt_flag = 'F'; | |
2626 | else | |
2627 | tt_flag = '.'; | |
2628 | ||
2629 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
2630 | "Routing TT_REQUEST to %pM [%c]\n", | |
2631 | dst, tt_flag); | |
2632 | /* tvlv API will re-route the packet */ | |
2633 | return NET_RX_DROP; | |
2634 | } | |
2635 | break; | |
2636 | case BATADV_TT_RESPONSE: | |
2637 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX); | |
2638 | ||
2639 | if (batadv_is_my_mac(bat_priv, dst)) { | |
2640 | batadv_handle_tt_response(bat_priv, tt_data, | |
2641 | src, num_entries); | |
2642 | return NET_RX_SUCCESS; | |
2643 | } | |
2644 | ||
2645 | if (tt_data->flags & BATADV_TT_FULL_TABLE) | |
2646 | tt_flag = 'F'; | |
2647 | else | |
2648 | tt_flag = '.'; | |
2649 | ||
2650 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
2651 | "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag); | |
2652 | ||
2653 | /* tvlv API will re-route the packet */ | |
2654 | return NET_RX_DROP; | |
2655 | } | |
2656 | ||
2657 | return NET_RX_SUCCESS; | |
2658 | } | |
2659 | ||
122edaa0 ML |
2660 | /** |
2661 | * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container | |
2662 | * @bat_priv: the bat priv with all the soft interface information | |
2663 | * @src: mac address of tt tvlv sender | |
2664 | * @dst: mac address of tt tvlv recipient | |
2665 | * @tvlv_value: tvlv buffer containing the tt data | |
2666 | * @tvlv_value_len: tvlv buffer length | |
2667 | * | |
2668 | * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS | |
2669 | * otherwise. | |
2670 | */ | |
2671 | static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, | |
2672 | uint8_t *src, uint8_t *dst, | |
2673 | void *tvlv_value, | |
2674 | uint16_t tvlv_value_len) | |
2675 | { | |
2676 | struct batadv_tvlv_roam_adv *roaming_adv; | |
2677 | struct batadv_orig_node *orig_node = NULL; | |
2678 | ||
2679 | /* If this node is not the intended recipient of the | |
2680 | * roaming advertisement the packet is forwarded | |
2681 | * (the tvlv API will re-route the packet). | |
2682 | */ | |
2683 | if (!batadv_is_my_mac(bat_priv, dst)) | |
2684 | return NET_RX_DROP; | |
2685 | ||
2686 | /* check if it is a backbone gateway. we don't accept | |
2687 | * roaming advertisement from it, as it has the same | |
2688 | * entries as we have. | |
2689 | */ | |
2690 | if (batadv_bla_is_backbone_gw_orig(bat_priv, src)) | |
2691 | goto out; | |
2692 | ||
2693 | if (tvlv_value_len < sizeof(*roaming_adv)) | |
2694 | goto out; | |
2695 | ||
2696 | orig_node = batadv_orig_hash_find(bat_priv, src); | |
2697 | if (!orig_node) | |
2698 | goto out; | |
2699 | ||
2700 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX); | |
2701 | roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value; | |
2702 | ||
2703 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
2704 | "Received ROAMING_ADV from %pM (client %pM)\n", | |
2705 | src, roaming_adv->client); | |
2706 | ||
2707 | batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client, | |
2708 | BATADV_TT_CLIENT_ROAM, | |
2709 | atomic_read(&orig_node->last_ttvn) + 1); | |
2710 | ||
2711 | out: | |
2712 | if (orig_node) | |
2713 | batadv_orig_node_free_ref(orig_node); | |
2714 | return NET_RX_SUCCESS; | |
2715 | } | |
2716 | ||
e1bf0c14 ML |
2717 | /** |
2718 | * batadv_tt_init - initialise the translation table internals | |
2719 | * @bat_priv: the bat priv with all the soft interface information | |
2720 | * | |
2721 | * Return 0 on success or negative error number in case of failure. | |
2722 | */ | |
2723 | int batadv_tt_init(struct batadv_priv *bat_priv) | |
2724 | { | |
2725 | int ret; | |
2726 | ||
2727 | ret = batadv_tt_local_init(bat_priv); | |
2728 | if (ret < 0) | |
2729 | return ret; | |
2730 | ||
2731 | ret = batadv_tt_global_init(bat_priv); | |
2732 | if (ret < 0) | |
2733 | return ret; | |
2734 | ||
2735 | batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1, | |
335fbe0f ML |
2736 | batadv_tt_tvlv_unicast_handler_v1, |
2737 | BATADV_TVLV_TT, 1, BATADV_NO_FLAGS); | |
e1bf0c14 | 2738 | |
122edaa0 ML |
2739 | batadv_tvlv_handler_register(bat_priv, NULL, |
2740 | batadv_roam_tvlv_unicast_handler_v1, | |
2741 | BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS); | |
2742 | ||
e1bf0c14 ML |
2743 | INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge); |
2744 | queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work, | |
2745 | msecs_to_jiffies(BATADV_TT_WORK_PERIOD)); | |
2746 | ||
2747 | return 1; | |
2748 | } |