Commit | Line | Data |
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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 | ||
21026059 AQ |
120 | /** |
121 | * batadv_tt_global_entry_free_ref - decrement the refcounter for a | |
122 | * tt_global_entry and possibly free it | |
123 | * @tt_global_entry: the object to free | |
124 | */ | |
a513088d | 125 | static void |
56303d34 | 126 | batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry) |
7683fdc1 | 127 | { |
db08e6e5 | 128 | if (atomic_dec_and_test(&tt_global_entry->common.refcount)) { |
a513088d | 129 | batadv_tt_global_del_orig_list(tt_global_entry); |
21026059 | 130 | kfree_rcu(tt_global_entry, common.rcu); |
db08e6e5 SW |
131 | } |
132 | } | |
133 | ||
a513088d | 134 | static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu) |
db08e6e5 | 135 | { |
56303d34 | 136 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 | 137 | |
56303d34 | 138 | orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu); |
72822225 LL |
139 | |
140 | /* We are in an rcu callback here, therefore we cannot use | |
141 | * batadv_orig_node_free_ref() and its call_rcu(): | |
142 | * An rcu_barrier() wouldn't wait for that to finish | |
143 | */ | |
144 | batadv_orig_node_free_ref_now(orig_entry->orig_node); | |
db08e6e5 SW |
145 | kfree(orig_entry); |
146 | } | |
147 | ||
a513088d | 148 | static void |
56303d34 | 149 | batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry) |
db08e6e5 | 150 | { |
d657e621 AQ |
151 | if (!atomic_dec_and_test(&orig_entry->refcount)) |
152 | return; | |
29cb99de AQ |
153 | /* to avoid race conditions, immediately decrease the tt counter */ |
154 | atomic_dec(&orig_entry->orig_node->tt_size); | |
a513088d | 155 | call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu); |
7683fdc1 AQ |
156 | } |
157 | ||
3abe4adb AQ |
158 | /** |
159 | * batadv_tt_local_event - store a local TT event (ADD/DEL) | |
160 | * @bat_priv: the bat priv with all the soft interface information | |
161 | * @tt_local_entry: the TT entry involved in the event | |
162 | * @event_flags: flags to store in the event structure | |
163 | */ | |
56303d34 | 164 | static void batadv_tt_local_event(struct batadv_priv *bat_priv, |
3abe4adb AQ |
165 | struct batadv_tt_local_entry *tt_local_entry, |
166 | uint8_t event_flags) | |
a73105b8 | 167 | { |
56303d34 | 168 | struct batadv_tt_change_node *tt_change_node, *entry, *safe; |
3abe4adb AQ |
169 | struct batadv_tt_common_entry *common = &tt_local_entry->common; |
170 | uint8_t flags = common->flags | event_flags; | |
3b643de5 AQ |
171 | bool event_removed = false; |
172 | bool del_op_requested, del_op_entry; | |
a73105b8 AQ |
173 | |
174 | tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC); | |
a73105b8 AQ |
175 | if (!tt_change_node) |
176 | return; | |
177 | ||
ff66c975 | 178 | tt_change_node->change.flags = flags; |
e1bf0c14 | 179 | tt_change_node->change.reserved = 0; |
3abe4adb | 180 | memcpy(tt_change_node->change.addr, common->addr, ETH_ALEN); |
a73105b8 | 181 | |
acd34afa | 182 | del_op_requested = flags & BATADV_TT_CLIENT_DEL; |
3b643de5 AQ |
183 | |
184 | /* check for ADD+DEL or DEL+ADD events */ | |
807736f6 SE |
185 | spin_lock_bh(&bat_priv->tt.changes_list_lock); |
186 | list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, | |
3b643de5 | 187 | list) { |
3abe4adb | 188 | if (!batadv_compare_eth(entry->change.addr, common->addr)) |
3b643de5 AQ |
189 | continue; |
190 | ||
191 | /* DEL+ADD in the same orig interval have no effect and can be | |
192 | * removed to avoid silly behaviour on the receiver side. The | |
193 | * other way around (ADD+DEL) can happen in case of roaming of | |
194 | * a client still in the NEW state. Roaming of NEW clients is | |
195 | * now possible due to automatically recognition of "temporary" | |
196 | * clients | |
197 | */ | |
acd34afa | 198 | del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL; |
3b643de5 AQ |
199 | if (!del_op_requested && del_op_entry) |
200 | goto del; | |
201 | if (del_op_requested && !del_op_entry) | |
202 | goto del; | |
203 | continue; | |
204 | del: | |
205 | list_del(&entry->list); | |
206 | kfree(entry); | |
155e4e12 | 207 | kfree(tt_change_node); |
3b643de5 AQ |
208 | event_removed = true; |
209 | goto unlock; | |
210 | } | |
211 | ||
a73105b8 | 212 | /* track the change in the OGMinterval list */ |
807736f6 | 213 | list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list); |
3b643de5 AQ |
214 | |
215 | unlock: | |
807736f6 | 216 | spin_unlock_bh(&bat_priv->tt.changes_list_lock); |
a73105b8 | 217 | |
3b643de5 | 218 | if (event_removed) |
807736f6 | 219 | atomic_dec(&bat_priv->tt.local_changes); |
3b643de5 | 220 | else |
807736f6 | 221 | atomic_inc(&bat_priv->tt.local_changes); |
a73105b8 AQ |
222 | } |
223 | ||
335fbe0f ML |
224 | /** |
225 | * batadv_tt_len - compute length in bytes of given number of tt changes | |
226 | * @changes_num: number of tt changes | |
227 | * | |
228 | * Returns computed length in bytes. | |
229 | */ | |
230 | static int batadv_tt_len(int changes_num) | |
a73105b8 | 231 | { |
335fbe0f | 232 | return changes_num * sizeof(struct batadv_tvlv_tt_change); |
a73105b8 AQ |
233 | } |
234 | ||
56303d34 | 235 | static int batadv_tt_local_init(struct batadv_priv *bat_priv) |
c6c8fea2 | 236 | { |
807736f6 | 237 | if (bat_priv->tt.local_hash) |
5346c35e | 238 | return 0; |
c6c8fea2 | 239 | |
807736f6 | 240 | bat_priv->tt.local_hash = batadv_hash_new(1024); |
c6c8fea2 | 241 | |
807736f6 | 242 | if (!bat_priv->tt.local_hash) |
5346c35e | 243 | return -ENOMEM; |
c6c8fea2 | 244 | |
dec05074 AQ |
245 | batadv_hash_set_lock_class(bat_priv->tt.local_hash, |
246 | &batadv_tt_local_hash_lock_class_key); | |
247 | ||
5346c35e | 248 | return 0; |
c6c8fea2 SE |
249 | } |
250 | ||
068ee6e2 AQ |
251 | static void batadv_tt_global_free(struct batadv_priv *bat_priv, |
252 | struct batadv_tt_global_entry *tt_global, | |
253 | const char *message) | |
254 | { | |
255 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
256 | "Deleting global tt entry %pM: %s\n", | |
257 | tt_global->common.addr, message); | |
258 | ||
259 | batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt, | |
260 | batadv_choose_orig, tt_global->common.addr); | |
261 | batadv_tt_global_entry_free_ref(tt_global); | |
068ee6e2 AQ |
262 | } |
263 | ||
08c36d3e SE |
264 | void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, |
265 | int ifindex) | |
c6c8fea2 | 266 | { |
56303d34 | 267 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
170173bf SE |
268 | struct batadv_tt_local_entry *tt_local; |
269 | struct batadv_tt_global_entry *tt_global; | |
db08e6e5 | 270 | struct hlist_head *head; |
56303d34 | 271 | struct batadv_tt_orig_list_entry *orig_entry; |
80b3f58c | 272 | int hash_added; |
068ee6e2 | 273 | bool roamed_back = false; |
c6c8fea2 | 274 | |
47c94655 | 275 | tt_local = batadv_tt_local_hash_find(bat_priv, addr); |
068ee6e2 | 276 | tt_global = batadv_tt_global_hash_find(bat_priv, addr); |
c6c8fea2 | 277 | |
47c94655 AQ |
278 | if (tt_local) { |
279 | tt_local->last_seen = jiffies; | |
068ee6e2 AQ |
280 | if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) { |
281 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
282 | "Re-adding pending client %pM\n", addr); | |
283 | /* whatever the reason why the PENDING flag was set, | |
284 | * this is a client which was enqueued to be removed in | |
285 | * this orig_interval. Since it popped up again, the | |
286 | * flag can be reset like it was never enqueued | |
287 | */ | |
288 | tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING; | |
289 | goto add_event; | |
290 | } | |
291 | ||
292 | if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) { | |
293 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
294 | "Roaming client %pM came back to its original location\n", | |
295 | addr); | |
296 | /* the ROAM flag is set because this client roamed away | |
297 | * and the node got a roaming_advertisement message. Now | |
298 | * that the client popped up again at its original | |
299 | * location such flag can be unset | |
300 | */ | |
301 | tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM; | |
302 | roamed_back = true; | |
303 | } | |
304 | goto check_roaming; | |
c6c8fea2 SE |
305 | } |
306 | ||
47c94655 AQ |
307 | tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC); |
308 | if (!tt_local) | |
7683fdc1 | 309 | goto out; |
a73105b8 | 310 | |
39c75a51 | 311 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 312 | "Creating new local tt entry: %pM (ttvn: %d)\n", addr, |
807736f6 | 313 | (uint8_t)atomic_read(&bat_priv->tt.vn)); |
c6c8fea2 | 314 | |
47c94655 | 315 | memcpy(tt_local->common.addr, addr, ETH_ALEN); |
8425ec6a AQ |
316 | /* The local entry has to be marked as NEW to avoid to send it in |
317 | * a full table response going out before the next ttvn increment | |
318 | * (consistency check) | |
319 | */ | |
320 | tt_local->common.flags = BATADV_TT_CLIENT_NEW; | |
9563877e | 321 | if (batadv_is_wifi_iface(ifindex)) |
47c94655 AQ |
322 | tt_local->common.flags |= BATADV_TT_CLIENT_WIFI; |
323 | atomic_set(&tt_local->common.refcount, 2); | |
324 | tt_local->last_seen = jiffies; | |
325 | tt_local->common.added_at = tt_local->last_seen; | |
c6c8fea2 SE |
326 | |
327 | /* the batman interface mac address should never be purged */ | |
1eda58bf | 328 | if (batadv_compare_eth(addr, soft_iface->dev_addr)) |
47c94655 | 329 | tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE; |
c6c8fea2 | 330 | |
807736f6 | 331 | hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt, |
47c94655 AQ |
332 | batadv_choose_orig, &tt_local->common, |
333 | &tt_local->common.hash_entry); | |
80b3f58c SW |
334 | |
335 | if (unlikely(hash_added != 0)) { | |
336 | /* remove the reference for the hash */ | |
47c94655 | 337 | batadv_tt_local_entry_free_ref(tt_local); |
80b3f58c SW |
338 | goto out; |
339 | } | |
340 | ||
068ee6e2 | 341 | add_event: |
3abe4adb | 342 | batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS); |
ff66c975 | 343 | |
068ee6e2 AQ |
344 | check_roaming: |
345 | /* Check whether it is a roaming, but don't do anything if the roaming | |
346 | * process has already been handled | |
347 | */ | |
348 | if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) { | |
db08e6e5 | 349 | /* These node are probably going to update their tt table */ |
47c94655 | 350 | head = &tt_global->orig_list; |
db08e6e5 | 351 | rcu_read_lock(); |
b67bfe0d | 352 | hlist_for_each_entry_rcu(orig_entry, head, list) { |
47c94655 | 353 | batadv_send_roam_adv(bat_priv, tt_global->common.addr, |
a513088d | 354 | orig_entry->orig_node); |
db08e6e5 SW |
355 | } |
356 | rcu_read_unlock(); | |
068ee6e2 AQ |
357 | if (roamed_back) { |
358 | batadv_tt_global_free(bat_priv, tt_global, | |
359 | "Roaming canceled"); | |
360 | tt_global = NULL; | |
361 | } else { | |
362 | /* The global entry has to be marked as ROAMING and | |
363 | * has to be kept for consistency purpose | |
364 | */ | |
365 | tt_global->common.flags |= BATADV_TT_CLIENT_ROAM; | |
366 | tt_global->roam_at = jiffies; | |
367 | } | |
7683fdc1 | 368 | } |
068ee6e2 | 369 | |
7683fdc1 | 370 | out: |
47c94655 AQ |
371 | if (tt_local) |
372 | batadv_tt_local_entry_free_ref(tt_local); | |
373 | if (tt_global) | |
374 | batadv_tt_global_entry_free_ref(tt_global); | |
c6c8fea2 SE |
375 | } |
376 | ||
e1bf0c14 ML |
377 | /** |
378 | * batadv_tt_tvlv_container_update - update the translation table tvlv container | |
379 | * after local tt changes have been committed | |
380 | * @bat_priv: the bat priv with all the soft interface information | |
381 | */ | |
382 | static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv) | |
be9aa4c1 | 383 | { |
e1bf0c14 ML |
384 | struct batadv_tt_change_node *entry, *safe; |
385 | struct batadv_tvlv_tt_data *tt_data; | |
386 | struct batadv_tvlv_tt_change *tt_change; | |
387 | int tt_diff_len = 0, tt_change_len = 0; | |
388 | int tt_diff_entries_num = 0, tt_diff_entries_count = 0; | |
be9aa4c1 | 389 | |
e1bf0c14 | 390 | tt_diff_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes)); |
be9aa4c1 ML |
391 | |
392 | /* if we have too many changes for one packet don't send any | |
393 | * and wait for the tt table request which will be fragmented | |
394 | */ | |
e1bf0c14 ML |
395 | if (tt_diff_len > bat_priv->soft_iface->mtu) |
396 | tt_diff_len = 0; | |
be9aa4c1 | 397 | |
e1bf0c14 ML |
398 | tt_data = kzalloc(sizeof(*tt_data) + tt_diff_len, GFP_ATOMIC); |
399 | if (!tt_data) | |
400 | return; | |
be9aa4c1 | 401 | |
e1bf0c14 ML |
402 | tt_data->flags = BATADV_TT_OGM_DIFF; |
403 | tt_data->ttvn = atomic_read(&bat_priv->tt.vn); | |
ced72933 | 404 | tt_data->crc = htonl(bat_priv->tt.local_crc); |
c6c8fea2 | 405 | |
e1bf0c14 ML |
406 | if (tt_diff_len == 0) |
407 | goto container_register; | |
be9aa4c1 | 408 | |
e1bf0c14 | 409 | tt_diff_entries_num = tt_diff_len / batadv_tt_len(1); |
c6c8fea2 | 410 | |
807736f6 SE |
411 | spin_lock_bh(&bat_priv->tt.changes_list_lock); |
412 | atomic_set(&bat_priv->tt.local_changes, 0); | |
c6c8fea2 | 413 | |
e1bf0c14 ML |
414 | tt_change = (struct batadv_tvlv_tt_change *)(tt_data + 1); |
415 | ||
807736f6 | 416 | list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, |
7c64fd98 | 417 | list) { |
e1bf0c14 ML |
418 | if (tt_diff_entries_count < tt_diff_entries_num) { |
419 | memcpy(tt_change + tt_diff_entries_count, | |
420 | &entry->change, | |
421 | sizeof(struct batadv_tvlv_tt_change)); | |
422 | tt_diff_entries_count++; | |
c6c8fea2 | 423 | } |
a73105b8 AQ |
424 | list_del(&entry->list); |
425 | kfree(entry); | |
c6c8fea2 | 426 | } |
807736f6 | 427 | spin_unlock_bh(&bat_priv->tt.changes_list_lock); |
a73105b8 AQ |
428 | |
429 | /* Keep the buffer for possible tt_request */ | |
807736f6 SE |
430 | spin_lock_bh(&bat_priv->tt.last_changeset_lock); |
431 | kfree(bat_priv->tt.last_changeset); | |
432 | bat_priv->tt.last_changeset_len = 0; | |
433 | bat_priv->tt.last_changeset = NULL; | |
e1bf0c14 | 434 | tt_change_len = batadv_tt_len(tt_diff_entries_count); |
be9aa4c1 | 435 | /* check whether this new OGM has no changes due to size problems */ |
e1bf0c14 | 436 | if (tt_diff_entries_count > 0) { |
be9aa4c1 | 437 | /* if kmalloc() fails we will reply with the full table |
a73105b8 AQ |
438 | * instead of providing the diff |
439 | */ | |
e1bf0c14 | 440 | bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC); |
807736f6 | 441 | if (bat_priv->tt.last_changeset) { |
e1bf0c14 ML |
442 | memcpy(bat_priv->tt.last_changeset, |
443 | tt_change, tt_change_len); | |
444 | bat_priv->tt.last_changeset_len = tt_diff_len; | |
a73105b8 AQ |
445 | } |
446 | } | |
807736f6 | 447 | spin_unlock_bh(&bat_priv->tt.last_changeset_lock); |
c6c8fea2 | 448 | |
e1bf0c14 ML |
449 | container_register: |
450 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data, | |
451 | sizeof(*tt_data) + tt_change_len); | |
452 | kfree(tt_data); | |
c6c8fea2 SE |
453 | } |
454 | ||
08c36d3e | 455 | int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
456 | { |
457 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 458 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 459 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
56303d34 | 460 | struct batadv_tt_common_entry *tt_common_entry; |
85766a82 | 461 | struct batadv_tt_local_entry *tt_local; |
56303d34 | 462 | struct batadv_hard_iface *primary_if; |
c6c8fea2 | 463 | struct hlist_head *head; |
c90681b8 | 464 | uint32_t i; |
85766a82 AQ |
465 | int last_seen_secs; |
466 | int last_seen_msecs; | |
467 | unsigned long last_seen_jiffies; | |
468 | bool no_purge; | |
469 | uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE; | |
c6c8fea2 | 470 | |
30da63a6 ML |
471 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
472 | if (!primary_if) | |
32ae9b22 | 473 | goto out; |
c6c8fea2 | 474 | |
86ceb360 | 475 | seq_printf(seq, |
ced72933 | 476 | "Locally retrieved addresses (from %s) announced via TT (TTVN: %u CRC: %#.8x):\n", |
f9d8a537 AQ |
477 | net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn), |
478 | bat_priv->tt.local_crc); | |
85766a82 AQ |
479 | seq_printf(seq, " %-13s %-7s %-10s\n", "Client", "Flags", |
480 | "Last seen"); | |
c6c8fea2 | 481 | |
c6c8fea2 SE |
482 | for (i = 0; i < hash->size; i++) { |
483 | head = &hash->table[i]; | |
484 | ||
7aadf889 | 485 | rcu_read_lock(); |
b67bfe0d | 486 | hlist_for_each_entry_rcu(tt_common_entry, |
7aadf889 | 487 | head, hash_entry) { |
85766a82 AQ |
488 | tt_local = container_of(tt_common_entry, |
489 | struct batadv_tt_local_entry, | |
490 | common); | |
491 | last_seen_jiffies = jiffies - tt_local->last_seen; | |
492 | last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); | |
493 | last_seen_secs = last_seen_msecs / 1000; | |
494 | last_seen_msecs = last_seen_msecs % 1000; | |
495 | ||
496 | no_purge = tt_common_entry->flags & np_flag; | |
497 | ||
498 | seq_printf(seq, " * %pM [%c%c%c%c%c] %3u.%03u\n", | |
7c64fd98 SE |
499 | tt_common_entry->addr, |
500 | (tt_common_entry->flags & | |
acd34afa | 501 | BATADV_TT_CLIENT_ROAM ? 'R' : '.'), |
85766a82 | 502 | no_purge ? 'P' : '.', |
7c64fd98 | 503 | (tt_common_entry->flags & |
acd34afa | 504 | BATADV_TT_CLIENT_NEW ? 'N' : '.'), |
7c64fd98 | 505 | (tt_common_entry->flags & |
acd34afa | 506 | BATADV_TT_CLIENT_PENDING ? 'X' : '.'), |
7c64fd98 | 507 | (tt_common_entry->flags & |
85766a82 | 508 | BATADV_TT_CLIENT_WIFI ? 'W' : '.'), |
a7966d90 AQ |
509 | no_purge ? 0 : last_seen_secs, |
510 | no_purge ? 0 : last_seen_msecs); | |
c6c8fea2 | 511 | } |
7aadf889 | 512 | rcu_read_unlock(); |
c6c8fea2 | 513 | } |
32ae9b22 ML |
514 | out: |
515 | if (primary_if) | |
e5d89254 | 516 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 517 | return 0; |
c6c8fea2 SE |
518 | } |
519 | ||
56303d34 SE |
520 | static void |
521 | batadv_tt_local_set_pending(struct batadv_priv *bat_priv, | |
522 | struct batadv_tt_local_entry *tt_local_entry, | |
523 | uint16_t flags, const char *message) | |
c6c8fea2 | 524 | { |
3abe4adb | 525 | batadv_tt_local_event(bat_priv, tt_local_entry, flags); |
a73105b8 | 526 | |
015758d0 AQ |
527 | /* The local client has to be marked as "pending to be removed" but has |
528 | * to be kept in the table in order to send it in a full table | |
9cfc7bd6 SE |
529 | * response issued before the net ttvn increment (consistency check) |
530 | */ | |
acd34afa | 531 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING; |
c566dbbe | 532 | |
39c75a51 | 533 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
534 | "Local tt entry (%pM) pending to be removed: %s\n", |
535 | tt_local_entry->common.addr, message); | |
c6c8fea2 SE |
536 | } |
537 | ||
7f91d06c AQ |
538 | /** |
539 | * batadv_tt_local_remove - logically remove an entry from the local table | |
540 | * @bat_priv: the bat priv with all the soft interface information | |
541 | * @addr: the MAC address of the client to remove | |
542 | * @message: message to append to the log on deletion | |
543 | * @roaming: true if the deletion is due to a roaming event | |
544 | * | |
545 | * Returns the flags assigned to the local entry before being deleted | |
546 | */ | |
547 | uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv, | |
548 | const uint8_t *addr, const char *message, | |
549 | bool roaming) | |
c6c8fea2 | 550 | { |
170173bf | 551 | struct batadv_tt_local_entry *tt_local_entry; |
7f91d06c | 552 | uint16_t flags, curr_flags = BATADV_NO_FLAGS; |
c6c8fea2 | 553 | |
a513088d | 554 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
555 | if (!tt_local_entry) |
556 | goto out; | |
557 | ||
7f91d06c AQ |
558 | curr_flags = tt_local_entry->common.flags; |
559 | ||
acd34afa | 560 | flags = BATADV_TT_CLIENT_DEL; |
068ee6e2 AQ |
561 | /* if this global entry addition is due to a roaming, the node has to |
562 | * mark the local entry as "roamed" in order to correctly reroute | |
563 | * packets later | |
564 | */ | |
7c1fd91d | 565 | if (roaming) { |
acd34afa | 566 | flags |= BATADV_TT_CLIENT_ROAM; |
7c1fd91d AQ |
567 | /* mark the local client as ROAMed */ |
568 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM; | |
569 | } | |
42d0b044 | 570 | |
068ee6e2 AQ |
571 | if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) { |
572 | batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags, | |
573 | message); | |
574 | goto out; | |
575 | } | |
576 | /* if this client has been added right now, it is possible to | |
577 | * immediately purge it | |
578 | */ | |
3abe4adb | 579 | batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL); |
068ee6e2 AQ |
580 | hlist_del_rcu(&tt_local_entry->common.hash_entry); |
581 | batadv_tt_local_entry_free_ref(tt_local_entry); | |
7f91d06c | 582 | |
7683fdc1 AQ |
583 | out: |
584 | if (tt_local_entry) | |
a513088d | 585 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7f91d06c AQ |
586 | |
587 | return curr_flags; | |
c6c8fea2 SE |
588 | } |
589 | ||
56303d34 | 590 | static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, |
acd34afa | 591 | struct hlist_head *head) |
c6c8fea2 | 592 | { |
56303d34 SE |
593 | struct batadv_tt_local_entry *tt_local_entry; |
594 | struct batadv_tt_common_entry *tt_common_entry; | |
b67bfe0d | 595 | struct hlist_node *node_tmp; |
acd34afa | 596 | |
b67bfe0d | 597 | hlist_for_each_entry_safe(tt_common_entry, node_tmp, head, |
acd34afa SE |
598 | hash_entry) { |
599 | tt_local_entry = container_of(tt_common_entry, | |
56303d34 SE |
600 | struct batadv_tt_local_entry, |
601 | common); | |
acd34afa SE |
602 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE) |
603 | continue; | |
604 | ||
605 | /* entry already marked for deletion */ | |
606 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) | |
607 | continue; | |
608 | ||
609 | if (!batadv_has_timed_out(tt_local_entry->last_seen, | |
610 | BATADV_TT_LOCAL_TIMEOUT)) | |
611 | continue; | |
612 | ||
613 | batadv_tt_local_set_pending(bat_priv, tt_local_entry, | |
614 | BATADV_TT_CLIENT_DEL, "timed out"); | |
615 | } | |
616 | } | |
617 | ||
56303d34 | 618 | static void batadv_tt_local_purge(struct batadv_priv *bat_priv) |
acd34afa | 619 | { |
807736f6 | 620 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
c6c8fea2 | 621 | struct hlist_head *head; |
7683fdc1 | 622 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 623 | uint32_t i; |
c6c8fea2 | 624 | |
c6c8fea2 SE |
625 | for (i = 0; i < hash->size; i++) { |
626 | head = &hash->table[i]; | |
7683fdc1 | 627 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 628 | |
7683fdc1 | 629 | spin_lock_bh(list_lock); |
acd34afa | 630 | batadv_tt_local_purge_list(bat_priv, head); |
7683fdc1 | 631 | spin_unlock_bh(list_lock); |
c6c8fea2 | 632 | } |
c6c8fea2 SE |
633 | } |
634 | ||
56303d34 | 635 | static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 636 | { |
5bf74e9c | 637 | struct batadv_hashtable *hash; |
a73105b8 | 638 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
56303d34 SE |
639 | struct batadv_tt_common_entry *tt_common_entry; |
640 | struct batadv_tt_local_entry *tt_local; | |
b67bfe0d | 641 | struct hlist_node *node_tmp; |
7683fdc1 | 642 | struct hlist_head *head; |
c90681b8 | 643 | uint32_t i; |
a73105b8 | 644 | |
807736f6 | 645 | if (!bat_priv->tt.local_hash) |
c6c8fea2 SE |
646 | return; |
647 | ||
807736f6 | 648 | hash = bat_priv->tt.local_hash; |
a73105b8 AQ |
649 | |
650 | for (i = 0; i < hash->size; i++) { | |
651 | head = &hash->table[i]; | |
652 | list_lock = &hash->list_locks[i]; | |
653 | ||
654 | spin_lock_bh(list_lock); | |
b67bfe0d | 655 | hlist_for_each_entry_safe(tt_common_entry, node_tmp, |
a73105b8 | 656 | head, hash_entry) { |
b67bfe0d | 657 | hlist_del_rcu(&tt_common_entry->hash_entry); |
56303d34 SE |
658 | tt_local = container_of(tt_common_entry, |
659 | struct batadv_tt_local_entry, | |
660 | common); | |
661 | batadv_tt_local_entry_free_ref(tt_local); | |
a73105b8 AQ |
662 | } |
663 | spin_unlock_bh(list_lock); | |
664 | } | |
665 | ||
1a8eaf07 | 666 | batadv_hash_destroy(hash); |
a73105b8 | 667 | |
807736f6 | 668 | bat_priv->tt.local_hash = NULL; |
c6c8fea2 SE |
669 | } |
670 | ||
56303d34 | 671 | static int batadv_tt_global_init(struct batadv_priv *bat_priv) |
c6c8fea2 | 672 | { |
807736f6 | 673 | if (bat_priv->tt.global_hash) |
5346c35e | 674 | return 0; |
c6c8fea2 | 675 | |
807736f6 | 676 | bat_priv->tt.global_hash = batadv_hash_new(1024); |
c6c8fea2 | 677 | |
807736f6 | 678 | if (!bat_priv->tt.global_hash) |
5346c35e | 679 | return -ENOMEM; |
c6c8fea2 | 680 | |
dec05074 AQ |
681 | batadv_hash_set_lock_class(bat_priv->tt.global_hash, |
682 | &batadv_tt_global_hash_lock_class_key); | |
683 | ||
5346c35e | 684 | return 0; |
c6c8fea2 SE |
685 | } |
686 | ||
56303d34 | 687 | static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 688 | { |
56303d34 | 689 | struct batadv_tt_change_node *entry, *safe; |
c6c8fea2 | 690 | |
807736f6 | 691 | spin_lock_bh(&bat_priv->tt.changes_list_lock); |
c6c8fea2 | 692 | |
807736f6 | 693 | list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, |
a73105b8 AQ |
694 | list) { |
695 | list_del(&entry->list); | |
696 | kfree(entry); | |
697 | } | |
c6c8fea2 | 698 | |
807736f6 SE |
699 | atomic_set(&bat_priv->tt.local_changes, 0); |
700 | spin_unlock_bh(&bat_priv->tt.changes_list_lock); | |
a73105b8 | 701 | } |
c6c8fea2 | 702 | |
d657e621 AQ |
703 | /* retrieves the orig_tt_list_entry belonging to orig_node from the |
704 | * batadv_tt_global_entry list | |
705 | * | |
706 | * returns it with an increased refcounter, NULL if not found | |
db08e6e5 | 707 | */ |
d657e621 AQ |
708 | static struct batadv_tt_orig_list_entry * |
709 | batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry, | |
710 | const struct batadv_orig_node *orig_node) | |
db08e6e5 | 711 | { |
d657e621 | 712 | struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL; |
db08e6e5 | 713 | const struct hlist_head *head; |
db08e6e5 SW |
714 | |
715 | rcu_read_lock(); | |
716 | head = &entry->orig_list; | |
b67bfe0d | 717 | hlist_for_each_entry_rcu(tmp_orig_entry, head, list) { |
d657e621 AQ |
718 | if (tmp_orig_entry->orig_node != orig_node) |
719 | continue; | |
720 | if (!atomic_inc_not_zero(&tmp_orig_entry->refcount)) | |
721 | continue; | |
722 | ||
723 | orig_entry = tmp_orig_entry; | |
724 | break; | |
db08e6e5 SW |
725 | } |
726 | rcu_read_unlock(); | |
d657e621 AQ |
727 | |
728 | return orig_entry; | |
729 | } | |
730 | ||
731 | /* find out if an orig_node is already in the list of a tt_global_entry. | |
732 | * returns true if found, false otherwise | |
733 | */ | |
734 | static bool | |
735 | batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry, | |
736 | const struct batadv_orig_node *orig_node) | |
737 | { | |
738 | struct batadv_tt_orig_list_entry *orig_entry; | |
739 | bool found = false; | |
740 | ||
741 | orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node); | |
742 | if (orig_entry) { | |
743 | found = true; | |
744 | batadv_tt_orig_list_entry_free_ref(orig_entry); | |
745 | } | |
746 | ||
db08e6e5 SW |
747 | return found; |
748 | } | |
749 | ||
a513088d | 750 | static void |
d657e621 | 751 | batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global, |
56303d34 | 752 | struct batadv_orig_node *orig_node, int ttvn) |
db08e6e5 | 753 | { |
56303d34 | 754 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 | 755 | |
d657e621 | 756 | orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node); |
30cfd02b AQ |
757 | if (orig_entry) { |
758 | /* refresh the ttvn: the current value could be a bogus one that | |
759 | * was added during a "temporary client detection" | |
760 | */ | |
761 | orig_entry->ttvn = ttvn; | |
d657e621 | 762 | goto out; |
30cfd02b | 763 | } |
d657e621 | 764 | |
db08e6e5 SW |
765 | orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC); |
766 | if (!orig_entry) | |
d657e621 | 767 | goto out; |
db08e6e5 SW |
768 | |
769 | INIT_HLIST_NODE(&orig_entry->list); | |
770 | atomic_inc(&orig_node->refcount); | |
771 | atomic_inc(&orig_node->tt_size); | |
772 | orig_entry->orig_node = orig_node; | |
773 | orig_entry->ttvn = ttvn; | |
d657e621 | 774 | atomic_set(&orig_entry->refcount, 2); |
db08e6e5 | 775 | |
d657e621 | 776 | spin_lock_bh(&tt_global->list_lock); |
db08e6e5 | 777 | hlist_add_head_rcu(&orig_entry->list, |
d657e621 AQ |
778 | &tt_global->orig_list); |
779 | spin_unlock_bh(&tt_global->list_lock); | |
780 | out: | |
781 | if (orig_entry) | |
782 | batadv_tt_orig_list_entry_free_ref(orig_entry); | |
db08e6e5 SW |
783 | } |
784 | ||
d4ff40f6 AQ |
785 | /** |
786 | * batadv_tt_global_add - add a new TT global entry or update an existing one | |
787 | * @bat_priv: the bat priv with all the soft interface information | |
788 | * @orig_node: the originator announcing the client | |
789 | * @tt_addr: the mac address of the non-mesh client | |
790 | * @flags: TT flags that have to be set for this non-mesh client | |
791 | * @ttvn: the tt version number ever announcing this non-mesh client | |
792 | * | |
793 | * Add a new TT global entry for the given originator. If the entry already | |
794 | * exists add a new reference to the given originator (a global entry can have | |
795 | * references to multiple originators) and adjust the flags attribute to reflect | |
796 | * the function argument. | |
797 | * If a TT local entry exists for this non-mesh client remove it. | |
798 | * | |
799 | * The caller must hold orig_node refcount. | |
1e5d49fc AQ |
800 | * |
801 | * Return true if the new entry has been added, false otherwise | |
d4ff40f6 | 802 | */ |
1e5d49fc AQ |
803 | static bool batadv_tt_global_add(struct batadv_priv *bat_priv, |
804 | struct batadv_orig_node *orig_node, | |
805 | const unsigned char *tt_addr, uint16_t flags, | |
806 | uint8_t ttvn) | |
a73105b8 | 807 | { |
170173bf SE |
808 | struct batadv_tt_global_entry *tt_global_entry; |
809 | struct batadv_tt_local_entry *tt_local_entry; | |
1e5d49fc | 810 | bool ret = false; |
80b3f58c | 811 | int hash_added; |
56303d34 | 812 | struct batadv_tt_common_entry *common; |
7f91d06c | 813 | uint16_t local_flags; |
c6c8fea2 | 814 | |
a513088d | 815 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr); |
068ee6e2 AQ |
816 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr); |
817 | ||
818 | /* if the node already has a local client for this entry, it has to wait | |
819 | * for a roaming advertisement instead of manually messing up the global | |
820 | * table | |
821 | */ | |
822 | if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry && | |
823 | !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) | |
824 | goto out; | |
a73105b8 AQ |
825 | |
826 | if (!tt_global_entry) { | |
d4f44692 | 827 | tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC); |
a73105b8 | 828 | if (!tt_global_entry) |
7683fdc1 AQ |
829 | goto out; |
830 | ||
c0a55929 SE |
831 | common = &tt_global_entry->common; |
832 | memcpy(common->addr, tt_addr, ETH_ALEN); | |
db08e6e5 | 833 | |
d4f44692 | 834 | common->flags = flags; |
cc47f66e | 835 | tt_global_entry->roam_at = 0; |
fdf79320 AQ |
836 | /* node must store current time in case of roaming. This is |
837 | * needed to purge this entry out on timeout (if nobody claims | |
838 | * it) | |
839 | */ | |
840 | if (flags & BATADV_TT_CLIENT_ROAM) | |
841 | tt_global_entry->roam_at = jiffies; | |
c0a55929 | 842 | atomic_set(&common->refcount, 2); |
30cfd02b | 843 | common->added_at = jiffies; |
db08e6e5 SW |
844 | |
845 | INIT_HLIST_HEAD(&tt_global_entry->orig_list); | |
846 | spin_lock_init(&tt_global_entry->list_lock); | |
7683fdc1 | 847 | |
807736f6 | 848 | hash_added = batadv_hash_add(bat_priv->tt.global_hash, |
a513088d SE |
849 | batadv_compare_tt, |
850 | batadv_choose_orig, common, | |
851 | &common->hash_entry); | |
80b3f58c SW |
852 | |
853 | if (unlikely(hash_added != 0)) { | |
854 | /* remove the reference for the hash */ | |
a513088d | 855 | batadv_tt_global_entry_free_ref(tt_global_entry); |
80b3f58c SW |
856 | goto out_remove; |
857 | } | |
a73105b8 | 858 | } else { |
068ee6e2 | 859 | common = &tt_global_entry->common; |
30cfd02b AQ |
860 | /* If there is already a global entry, we can use this one for |
861 | * our processing. | |
068ee6e2 AQ |
862 | * But if we are trying to add a temporary client then here are |
863 | * two options at this point: | |
864 | * 1) the global client is not a temporary client: the global | |
865 | * client has to be left as it is, temporary information | |
866 | * should never override any already known client state | |
867 | * 2) the global client is a temporary client: purge the | |
868 | * originator list and add the new one orig_entry | |
30cfd02b | 869 | */ |
068ee6e2 AQ |
870 | if (flags & BATADV_TT_CLIENT_TEMP) { |
871 | if (!(common->flags & BATADV_TT_CLIENT_TEMP)) | |
872 | goto out; | |
873 | if (batadv_tt_global_entry_has_orig(tt_global_entry, | |
874 | orig_node)) | |
875 | goto out_remove; | |
876 | batadv_tt_global_del_orig_list(tt_global_entry); | |
877 | goto add_orig_entry; | |
878 | } | |
30cfd02b AQ |
879 | |
880 | /* if the client was temporary added before receiving the first | |
881 | * OGM announcing it, we have to clear the TEMP flag | |
882 | */ | |
068ee6e2 | 883 | common->flags &= ~BATADV_TT_CLIENT_TEMP; |
db08e6e5 | 884 | |
e9c00136 AQ |
885 | /* the change can carry possible "attribute" flags like the |
886 | * TT_CLIENT_WIFI, therefore they have to be copied in the | |
887 | * client entry | |
888 | */ | |
889 | tt_global_entry->common.flags |= flags; | |
890 | ||
acd34afa SE |
891 | /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only |
892 | * one originator left in the list and we previously received a | |
db08e6e5 SW |
893 | * delete + roaming change for this originator. |
894 | * | |
895 | * We should first delete the old originator before adding the | |
896 | * new one. | |
897 | */ | |
068ee6e2 | 898 | if (common->flags & BATADV_TT_CLIENT_ROAM) { |
a513088d | 899 | batadv_tt_global_del_orig_list(tt_global_entry); |
068ee6e2 | 900 | common->flags &= ~BATADV_TT_CLIENT_ROAM; |
db08e6e5 | 901 | tt_global_entry->roam_at = 0; |
a73105b8 AQ |
902 | } |
903 | } | |
068ee6e2 | 904 | add_orig_entry: |
30cfd02b | 905 | /* add the new orig_entry (if needed) or update it */ |
d657e621 | 906 | batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn); |
c6c8fea2 | 907 | |
39c75a51 | 908 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 909 | "Creating new global tt entry: %pM (via %pM)\n", |
068ee6e2 | 910 | common->addr, orig_node->orig); |
1e5d49fc | 911 | ret = true; |
c6c8fea2 | 912 | |
80b3f58c | 913 | out_remove: |
7f91d06c | 914 | |
a73105b8 | 915 | /* remove address from local hash if present */ |
7f91d06c AQ |
916 | local_flags = batadv_tt_local_remove(bat_priv, tt_addr, |
917 | "global tt received", | |
c1d07431 | 918 | flags & BATADV_TT_CLIENT_ROAM); |
7f91d06c AQ |
919 | tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI; |
920 | ||
068ee6e2 AQ |
921 | if (!(flags & BATADV_TT_CLIENT_ROAM)) |
922 | /* this is a normal global add. Therefore the client is not in a | |
923 | * roaming state anymore. | |
924 | */ | |
925 | tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM; | |
926 | ||
7683fdc1 AQ |
927 | out: |
928 | if (tt_global_entry) | |
a513088d | 929 | batadv_tt_global_entry_free_ref(tt_global_entry); |
068ee6e2 AQ |
930 | if (tt_local_entry) |
931 | batadv_tt_local_entry_free_ref(tt_local_entry); | |
7683fdc1 | 932 | return ret; |
c6c8fea2 SE |
933 | } |
934 | ||
981d8900 SE |
935 | /* batadv_transtable_best_orig - Get best originator list entry from tt entry |
936 | * @tt_global_entry: global translation table entry to be analyzed | |
937 | * | |
938 | * This functon assumes the caller holds rcu_read_lock(). | |
939 | * Returns best originator list entry or NULL on errors. | |
940 | */ | |
941 | static struct batadv_tt_orig_list_entry * | |
942 | batadv_transtable_best_orig(struct batadv_tt_global_entry *tt_global_entry) | |
943 | { | |
944 | struct batadv_neigh_node *router = NULL; | |
945 | struct hlist_head *head; | |
981d8900 SE |
946 | struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL; |
947 | int best_tq = 0; | |
948 | ||
949 | head = &tt_global_entry->orig_list; | |
b67bfe0d | 950 | hlist_for_each_entry_rcu(orig_entry, head, list) { |
981d8900 SE |
951 | router = batadv_orig_node_get_router(orig_entry->orig_node); |
952 | if (!router) | |
953 | continue; | |
954 | ||
955 | if (router->tq_avg > best_tq) { | |
956 | best_entry = orig_entry; | |
957 | best_tq = router->tq_avg; | |
958 | } | |
959 | ||
960 | batadv_neigh_node_free_ref(router); | |
961 | } | |
962 | ||
963 | return best_entry; | |
964 | } | |
965 | ||
966 | /* batadv_tt_global_print_entry - print all orig nodes who announce the address | |
967 | * for this global entry | |
968 | * @tt_global_entry: global translation table entry to be printed | |
969 | * @seq: debugfs table seq_file struct | |
970 | * | |
971 | * This functon assumes the caller holds rcu_read_lock(). | |
db08e6e5 | 972 | */ |
a513088d | 973 | static void |
56303d34 | 974 | batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry, |
a513088d | 975 | struct seq_file *seq) |
db08e6e5 SW |
976 | { |
977 | struct hlist_head *head; | |
981d8900 | 978 | struct batadv_tt_orig_list_entry *orig_entry, *best_entry; |
56303d34 | 979 | struct batadv_tt_common_entry *tt_common_entry; |
db08e6e5 SW |
980 | uint16_t flags; |
981 | uint8_t last_ttvn; | |
982 | ||
983 | tt_common_entry = &tt_global_entry->common; | |
981d8900 SE |
984 | flags = tt_common_entry->flags; |
985 | ||
986 | best_entry = batadv_transtable_best_orig(tt_global_entry); | |
987 | if (best_entry) { | |
988 | last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn); | |
f9d8a537 | 989 | seq_printf(seq, |
ced72933 | 990 | " %c %pM (%3u) via %pM (%3u) (%#.8x) [%c%c%c]\n", |
981d8900 SE |
991 | '*', tt_global_entry->common.addr, |
992 | best_entry->ttvn, best_entry->orig_node->orig, | |
f9d8a537 | 993 | last_ttvn, best_entry->orig_node->tt_crc, |
981d8900 SE |
994 | (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), |
995 | (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), | |
996 | (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.')); | |
997 | } | |
db08e6e5 SW |
998 | |
999 | head = &tt_global_entry->orig_list; | |
1000 | ||
b67bfe0d | 1001 | hlist_for_each_entry_rcu(orig_entry, head, list) { |
981d8900 SE |
1002 | if (best_entry == orig_entry) |
1003 | continue; | |
1004 | ||
db08e6e5 | 1005 | last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn); |
981d8900 SE |
1006 | seq_printf(seq, " %c %pM (%3u) via %pM (%3u) [%c%c%c]\n", |
1007 | '+', tt_global_entry->common.addr, | |
1008 | orig_entry->ttvn, orig_entry->orig_node->orig, | |
1009 | last_ttvn, | |
acd34afa | 1010 | (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), |
30cfd02b AQ |
1011 | (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), |
1012 | (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.')); | |
db08e6e5 SW |
1013 | } |
1014 | } | |
1015 | ||
08c36d3e | 1016 | int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
1017 | { |
1018 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1019 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 1020 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
56303d34 SE |
1021 | struct batadv_tt_common_entry *tt_common_entry; |
1022 | struct batadv_tt_global_entry *tt_global; | |
1023 | struct batadv_hard_iface *primary_if; | |
c6c8fea2 | 1024 | struct hlist_head *head; |
c90681b8 | 1025 | uint32_t i; |
c6c8fea2 | 1026 | |
30da63a6 ML |
1027 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1028 | if (!primary_if) | |
32ae9b22 | 1029 | goto out; |
c6c8fea2 | 1030 | |
2dafb49d AQ |
1031 | seq_printf(seq, |
1032 | "Globally announced TT entries received via the mesh %s\n", | |
c6c8fea2 | 1033 | net_dev->name); |
ced72933 | 1034 | seq_printf(seq, " %-13s %s %-15s %s (%-10s) %s\n", |
f9d8a537 AQ |
1035 | "Client", "(TTVN)", "Originator", "(Curr TTVN)", "CRC", |
1036 | "Flags"); | |
c6c8fea2 | 1037 | |
c6c8fea2 SE |
1038 | for (i = 0; i < hash->size; i++) { |
1039 | head = &hash->table[i]; | |
1040 | ||
7aadf889 | 1041 | rcu_read_lock(); |
b67bfe0d | 1042 | hlist_for_each_entry_rcu(tt_common_entry, |
7aadf889 | 1043 | head, hash_entry) { |
56303d34 SE |
1044 | tt_global = container_of(tt_common_entry, |
1045 | struct batadv_tt_global_entry, | |
1046 | common); | |
1047 | batadv_tt_global_print_entry(tt_global, seq); | |
c6c8fea2 | 1048 | } |
7aadf889 | 1049 | rcu_read_unlock(); |
c6c8fea2 | 1050 | } |
32ae9b22 ML |
1051 | out: |
1052 | if (primary_if) | |
e5d89254 | 1053 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 1054 | return 0; |
c6c8fea2 SE |
1055 | } |
1056 | ||
db08e6e5 | 1057 | /* deletes the orig list of a tt_global_entry */ |
a513088d | 1058 | static void |
56303d34 | 1059 | batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry) |
c6c8fea2 | 1060 | { |
db08e6e5 | 1061 | struct hlist_head *head; |
b67bfe0d | 1062 | struct hlist_node *safe; |
56303d34 | 1063 | struct batadv_tt_orig_list_entry *orig_entry; |
a73105b8 | 1064 | |
db08e6e5 SW |
1065 | spin_lock_bh(&tt_global_entry->list_lock); |
1066 | head = &tt_global_entry->orig_list; | |
b67bfe0d SL |
1067 | hlist_for_each_entry_safe(orig_entry, safe, head, list) { |
1068 | hlist_del_rcu(&orig_entry->list); | |
a513088d | 1069 | batadv_tt_orig_list_entry_free_ref(orig_entry); |
db08e6e5 SW |
1070 | } |
1071 | spin_unlock_bh(&tt_global_entry->list_lock); | |
db08e6e5 SW |
1072 | } |
1073 | ||
a513088d | 1074 | static void |
56303d34 SE |
1075 | batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv, |
1076 | struct batadv_tt_global_entry *tt_global_entry, | |
1077 | struct batadv_orig_node *orig_node, | |
a513088d | 1078 | const char *message) |
db08e6e5 SW |
1079 | { |
1080 | struct hlist_head *head; | |
b67bfe0d | 1081 | struct hlist_node *safe; |
56303d34 | 1082 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 SW |
1083 | |
1084 | spin_lock_bh(&tt_global_entry->list_lock); | |
1085 | head = &tt_global_entry->orig_list; | |
b67bfe0d | 1086 | hlist_for_each_entry_safe(orig_entry, safe, head, list) { |
db08e6e5 | 1087 | if (orig_entry->orig_node == orig_node) { |
39c75a51 | 1088 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1089 | "Deleting %pM from global tt entry %pM: %s\n", |
1090 | orig_node->orig, | |
1091 | tt_global_entry->common.addr, message); | |
b67bfe0d | 1092 | hlist_del_rcu(&orig_entry->list); |
a513088d | 1093 | batadv_tt_orig_list_entry_free_ref(orig_entry); |
db08e6e5 SW |
1094 | } |
1095 | } | |
1096 | spin_unlock_bh(&tt_global_entry->list_lock); | |
1097 | } | |
1098 | ||
db08e6e5 | 1099 | /* If the client is to be deleted, we check if it is the last origantor entry |
acd34afa SE |
1100 | * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the |
1101 | * timer, otherwise we simply remove the originator scheduled for deletion. | |
db08e6e5 | 1102 | */ |
a513088d | 1103 | static void |
56303d34 SE |
1104 | batadv_tt_global_del_roaming(struct batadv_priv *bat_priv, |
1105 | struct batadv_tt_global_entry *tt_global_entry, | |
1106 | struct batadv_orig_node *orig_node, | |
1107 | const char *message) | |
db08e6e5 SW |
1108 | { |
1109 | bool last_entry = true; | |
1110 | struct hlist_head *head; | |
56303d34 | 1111 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 SW |
1112 | |
1113 | /* no local entry exists, case 1: | |
1114 | * Check if this is the last one or if other entries exist. | |
1115 | */ | |
1116 | ||
1117 | rcu_read_lock(); | |
1118 | head = &tt_global_entry->orig_list; | |
b67bfe0d | 1119 | hlist_for_each_entry_rcu(orig_entry, head, list) { |
db08e6e5 SW |
1120 | if (orig_entry->orig_node != orig_node) { |
1121 | last_entry = false; | |
1122 | break; | |
1123 | } | |
1124 | } | |
1125 | rcu_read_unlock(); | |
1126 | ||
1127 | if (last_entry) { | |
1128 | /* its the last one, mark for roaming. */ | |
acd34afa | 1129 | tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; |
db08e6e5 SW |
1130 | tt_global_entry->roam_at = jiffies; |
1131 | } else | |
1132 | /* there is another entry, we can simply delete this | |
1133 | * one and can still use the other one. | |
1134 | */ | |
a513088d SE |
1135 | batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, |
1136 | orig_node, message); | |
db08e6e5 SW |
1137 | } |
1138 | ||
1139 | ||
1140 | ||
56303d34 SE |
1141 | static void batadv_tt_global_del(struct batadv_priv *bat_priv, |
1142 | struct batadv_orig_node *orig_node, | |
a513088d SE |
1143 | const unsigned char *addr, |
1144 | const char *message, bool roaming) | |
a73105b8 | 1145 | { |
170173bf | 1146 | struct batadv_tt_global_entry *tt_global_entry; |
56303d34 | 1147 | struct batadv_tt_local_entry *local_entry = NULL; |
a73105b8 | 1148 | |
a513088d | 1149 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
db08e6e5 | 1150 | if (!tt_global_entry) |
7683fdc1 | 1151 | goto out; |
a73105b8 | 1152 | |
db08e6e5 | 1153 | if (!roaming) { |
a513088d SE |
1154 | batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, |
1155 | orig_node, message); | |
db08e6e5 SW |
1156 | |
1157 | if (hlist_empty(&tt_global_entry->orig_list)) | |
be73b488 AQ |
1158 | batadv_tt_global_free(bat_priv, tt_global_entry, |
1159 | message); | |
db08e6e5 SW |
1160 | |
1161 | goto out; | |
1162 | } | |
92f90f56 SE |
1163 | |
1164 | /* if we are deleting a global entry due to a roam | |
1165 | * event, there are two possibilities: | |
db08e6e5 SW |
1166 | * 1) the client roamed from node A to node B => if there |
1167 | * is only one originator left for this client, we mark | |
acd34afa | 1168 | * it with BATADV_TT_CLIENT_ROAM, we start a timer and we |
92f90f56 SE |
1169 | * wait for node B to claim it. In case of timeout |
1170 | * the entry is purged. | |
db08e6e5 SW |
1171 | * |
1172 | * If there are other originators left, we directly delete | |
1173 | * the originator. | |
92f90f56 | 1174 | * 2) the client roamed to us => we can directly delete |
9cfc7bd6 SE |
1175 | * the global entry, since it is useless now. |
1176 | */ | |
a513088d SE |
1177 | local_entry = batadv_tt_local_hash_find(bat_priv, |
1178 | tt_global_entry->common.addr); | |
1179 | if (local_entry) { | |
db08e6e5 | 1180 | /* local entry exists, case 2: client roamed to us. */ |
a513088d | 1181 | batadv_tt_global_del_orig_list(tt_global_entry); |
be73b488 | 1182 | batadv_tt_global_free(bat_priv, tt_global_entry, message); |
db08e6e5 SW |
1183 | } else |
1184 | /* no local entry exists, case 1: check for roaming */ | |
a513088d SE |
1185 | batadv_tt_global_del_roaming(bat_priv, tt_global_entry, |
1186 | orig_node, message); | |
92f90f56 | 1187 | |
92f90f56 | 1188 | |
cc47f66e | 1189 | out: |
7683fdc1 | 1190 | if (tt_global_entry) |
a513088d SE |
1191 | batadv_tt_global_entry_free_ref(tt_global_entry); |
1192 | if (local_entry) | |
1193 | batadv_tt_local_entry_free_ref(local_entry); | |
a73105b8 AQ |
1194 | } |
1195 | ||
56303d34 SE |
1196 | void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, |
1197 | struct batadv_orig_node *orig_node, | |
1198 | const char *message) | |
c6c8fea2 | 1199 | { |
56303d34 SE |
1200 | struct batadv_tt_global_entry *tt_global; |
1201 | struct batadv_tt_common_entry *tt_common_entry; | |
c90681b8 | 1202 | uint32_t i; |
807736f6 | 1203 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
b67bfe0d | 1204 | struct hlist_node *safe; |
a73105b8 | 1205 | struct hlist_head *head; |
7683fdc1 | 1206 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c6c8fea2 | 1207 | |
6e801494 SW |
1208 | if (!hash) |
1209 | return; | |
1210 | ||
a73105b8 AQ |
1211 | for (i = 0; i < hash->size; i++) { |
1212 | head = &hash->table[i]; | |
7683fdc1 | 1213 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 1214 | |
7683fdc1 | 1215 | spin_lock_bh(list_lock); |
b67bfe0d | 1216 | hlist_for_each_entry_safe(tt_common_entry, safe, |
7c64fd98 | 1217 | head, hash_entry) { |
56303d34 SE |
1218 | tt_global = container_of(tt_common_entry, |
1219 | struct batadv_tt_global_entry, | |
1220 | common); | |
db08e6e5 | 1221 | |
56303d34 | 1222 | batadv_tt_global_del_orig_entry(bat_priv, tt_global, |
a513088d | 1223 | orig_node, message); |
db08e6e5 | 1224 | |
56303d34 | 1225 | if (hlist_empty(&tt_global->orig_list)) { |
39c75a51 | 1226 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 1227 | "Deleting global tt entry %pM: %s\n", |
56303d34 | 1228 | tt_global->common.addr, message); |
b67bfe0d | 1229 | hlist_del_rcu(&tt_common_entry->hash_entry); |
56303d34 | 1230 | batadv_tt_global_entry_free_ref(tt_global); |
7683fdc1 | 1231 | } |
a73105b8 | 1232 | } |
7683fdc1 | 1233 | spin_unlock_bh(list_lock); |
c6c8fea2 | 1234 | } |
17071578 | 1235 | orig_node->tt_initialised = false; |
c6c8fea2 SE |
1236 | } |
1237 | ||
30cfd02b AQ |
1238 | static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global, |
1239 | char **msg) | |
cc47f66e | 1240 | { |
30cfd02b AQ |
1241 | bool purge = false; |
1242 | unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT; | |
1243 | unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT; | |
42d0b044 | 1244 | |
30cfd02b AQ |
1245 | if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) && |
1246 | batadv_has_timed_out(tt_global->roam_at, roam_timeout)) { | |
1247 | purge = true; | |
1248 | *msg = "Roaming timeout\n"; | |
1249 | } | |
42d0b044 | 1250 | |
30cfd02b AQ |
1251 | if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) && |
1252 | batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) { | |
1253 | purge = true; | |
1254 | *msg = "Temporary client timeout\n"; | |
42d0b044 | 1255 | } |
30cfd02b AQ |
1256 | |
1257 | return purge; | |
42d0b044 SE |
1258 | } |
1259 | ||
30cfd02b | 1260 | static void batadv_tt_global_purge(struct batadv_priv *bat_priv) |
42d0b044 | 1261 | { |
807736f6 | 1262 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
cc47f66e | 1263 | struct hlist_head *head; |
b67bfe0d | 1264 | struct hlist_node *node_tmp; |
7683fdc1 | 1265 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 1266 | uint32_t i; |
30cfd02b AQ |
1267 | char *msg = NULL; |
1268 | struct batadv_tt_common_entry *tt_common; | |
1269 | struct batadv_tt_global_entry *tt_global; | |
cc47f66e | 1270 | |
cc47f66e AQ |
1271 | for (i = 0; i < hash->size; i++) { |
1272 | head = &hash->table[i]; | |
7683fdc1 | 1273 | list_lock = &hash->list_locks[i]; |
cc47f66e | 1274 | |
7683fdc1 | 1275 | spin_lock_bh(list_lock); |
b67bfe0d | 1276 | hlist_for_each_entry_safe(tt_common, node_tmp, head, |
30cfd02b AQ |
1277 | hash_entry) { |
1278 | tt_global = container_of(tt_common, | |
1279 | struct batadv_tt_global_entry, | |
1280 | common); | |
1281 | ||
1282 | if (!batadv_tt_global_to_purge(tt_global, &msg)) | |
1283 | continue; | |
1284 | ||
1285 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
1286 | "Deleting global tt entry (%pM): %s\n", | |
1287 | tt_global->common.addr, msg); | |
1288 | ||
b67bfe0d | 1289 | hlist_del_rcu(&tt_common->hash_entry); |
30cfd02b AQ |
1290 | |
1291 | batadv_tt_global_entry_free_ref(tt_global); | |
1292 | } | |
7683fdc1 | 1293 | spin_unlock_bh(list_lock); |
cc47f66e | 1294 | } |
cc47f66e AQ |
1295 | } |
1296 | ||
56303d34 | 1297 | static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 1298 | { |
5bf74e9c | 1299 | struct batadv_hashtable *hash; |
7683fdc1 | 1300 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
56303d34 SE |
1301 | struct batadv_tt_common_entry *tt_common_entry; |
1302 | struct batadv_tt_global_entry *tt_global; | |
b67bfe0d | 1303 | struct hlist_node *node_tmp; |
7683fdc1 | 1304 | struct hlist_head *head; |
c90681b8 | 1305 | uint32_t i; |
7683fdc1 | 1306 | |
807736f6 | 1307 | if (!bat_priv->tt.global_hash) |
c6c8fea2 SE |
1308 | return; |
1309 | ||
807736f6 | 1310 | hash = bat_priv->tt.global_hash; |
7683fdc1 AQ |
1311 | |
1312 | for (i = 0; i < hash->size; i++) { | |
1313 | head = &hash->table[i]; | |
1314 | list_lock = &hash->list_locks[i]; | |
1315 | ||
1316 | spin_lock_bh(list_lock); | |
b67bfe0d | 1317 | hlist_for_each_entry_safe(tt_common_entry, node_tmp, |
7683fdc1 | 1318 | head, hash_entry) { |
b67bfe0d | 1319 | hlist_del_rcu(&tt_common_entry->hash_entry); |
56303d34 SE |
1320 | tt_global = container_of(tt_common_entry, |
1321 | struct batadv_tt_global_entry, | |
1322 | common); | |
1323 | batadv_tt_global_entry_free_ref(tt_global); | |
7683fdc1 AQ |
1324 | } |
1325 | spin_unlock_bh(list_lock); | |
1326 | } | |
1327 | ||
1a8eaf07 | 1328 | batadv_hash_destroy(hash); |
7683fdc1 | 1329 | |
807736f6 | 1330 | bat_priv->tt.global_hash = NULL; |
c6c8fea2 SE |
1331 | } |
1332 | ||
56303d34 SE |
1333 | static bool |
1334 | _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry, | |
1335 | struct batadv_tt_global_entry *tt_global_entry) | |
59b699cd AQ |
1336 | { |
1337 | bool ret = false; | |
1338 | ||
acd34afa SE |
1339 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI && |
1340 | tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI) | |
59b699cd AQ |
1341 | ret = true; |
1342 | ||
1343 | return ret; | |
1344 | } | |
1345 | ||
56303d34 SE |
1346 | struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, |
1347 | const uint8_t *src, | |
1348 | const uint8_t *addr) | |
c6c8fea2 | 1349 | { |
56303d34 SE |
1350 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
1351 | struct batadv_tt_global_entry *tt_global_entry = NULL; | |
1352 | struct batadv_orig_node *orig_node = NULL; | |
981d8900 | 1353 | struct batadv_tt_orig_list_entry *best_entry; |
c6c8fea2 | 1354 | |
3d393e47 | 1355 | if (src && atomic_read(&bat_priv->ap_isolation)) { |
a513088d | 1356 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, src); |
068ee6e2 AQ |
1357 | if (!tt_local_entry || |
1358 | (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)) | |
3d393e47 AQ |
1359 | goto out; |
1360 | } | |
7aadf889 | 1361 | |
a513088d | 1362 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
2dafb49d | 1363 | if (!tt_global_entry) |
7b36e8ee | 1364 | goto out; |
7aadf889 | 1365 | |
3d393e47 | 1366 | /* check whether the clients should not communicate due to AP |
9cfc7bd6 SE |
1367 | * isolation |
1368 | */ | |
a513088d SE |
1369 | if (tt_local_entry && |
1370 | _batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) | |
3d393e47 AQ |
1371 | goto out; |
1372 | ||
db08e6e5 | 1373 | rcu_read_lock(); |
981d8900 | 1374 | best_entry = batadv_transtable_best_orig(tt_global_entry); |
db08e6e5 | 1375 | /* found anything? */ |
981d8900 SE |
1376 | if (best_entry) |
1377 | orig_node = best_entry->orig_node; | |
db08e6e5 SW |
1378 | if (orig_node && !atomic_inc_not_zero(&orig_node->refcount)) |
1379 | orig_node = NULL; | |
1380 | rcu_read_unlock(); | |
981d8900 | 1381 | |
7b36e8ee | 1382 | out: |
3d393e47 | 1383 | if (tt_global_entry) |
a513088d | 1384 | batadv_tt_global_entry_free_ref(tt_global_entry); |
3d393e47 | 1385 | if (tt_local_entry) |
a513088d | 1386 | batadv_tt_local_entry_free_ref(tt_local_entry); |
3d393e47 | 1387 | |
7b36e8ee | 1388 | return orig_node; |
c6c8fea2 | 1389 | } |
a73105b8 | 1390 | |
ced72933 AQ |
1391 | /** |
1392 | * batadv_tt_global_crc - calculates the checksum of the local table belonging | |
1393 | * to the given orig_node | |
1394 | * @bat_priv: the bat priv with all the soft interface information | |
1395 | */ | |
1396 | static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv, | |
56303d34 | 1397 | struct batadv_orig_node *orig_node) |
a73105b8 | 1398 | { |
807736f6 | 1399 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
56303d34 SE |
1400 | struct batadv_tt_common_entry *tt_common; |
1401 | struct batadv_tt_global_entry *tt_global; | |
a73105b8 | 1402 | struct hlist_head *head; |
ced72933 | 1403 | uint32_t i, crc = 0; |
a73105b8 AQ |
1404 | |
1405 | for (i = 0; i < hash->size; i++) { | |
1406 | head = &hash->table[i]; | |
1407 | ||
1408 | rcu_read_lock(); | |
b67bfe0d | 1409 | hlist_for_each_entry_rcu(tt_common, head, hash_entry) { |
56303d34 SE |
1410 | tt_global = container_of(tt_common, |
1411 | struct batadv_tt_global_entry, | |
1412 | common); | |
db08e6e5 SW |
1413 | /* Roaming clients are in the global table for |
1414 | * consistency only. They don't have to be | |
1415 | * taken into account while computing the | |
1416 | * global crc | |
1417 | */ | |
acd34afa | 1418 | if (tt_common->flags & BATADV_TT_CLIENT_ROAM) |
db08e6e5 | 1419 | continue; |
30cfd02b AQ |
1420 | /* Temporary clients have not been announced yet, so |
1421 | * they have to be skipped while computing the global | |
1422 | * crc | |
1423 | */ | |
1424 | if (tt_common->flags & BATADV_TT_CLIENT_TEMP) | |
1425 | continue; | |
db08e6e5 SW |
1426 | |
1427 | /* find out if this global entry is announced by this | |
1428 | * originator | |
1429 | */ | |
56303d34 | 1430 | if (!batadv_tt_global_entry_has_orig(tt_global, |
a513088d | 1431 | orig_node)) |
db08e6e5 SW |
1432 | continue; |
1433 | ||
ced72933 | 1434 | crc ^= crc32c(0, tt_common->addr, ETH_ALEN); |
a73105b8 AQ |
1435 | } |
1436 | rcu_read_unlock(); | |
1437 | } | |
1438 | ||
ced72933 | 1439 | return crc; |
a73105b8 AQ |
1440 | } |
1441 | ||
ced72933 AQ |
1442 | /** |
1443 | * batadv_tt_local_crc - calculates the checksum of the local table | |
1444 | * @bat_priv: the bat priv with all the soft interface information | |
1445 | */ | |
1446 | static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv) | |
a73105b8 | 1447 | { |
807736f6 | 1448 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
56303d34 | 1449 | struct batadv_tt_common_entry *tt_common; |
a73105b8 | 1450 | struct hlist_head *head; |
ced72933 | 1451 | uint32_t i, crc = 0; |
a73105b8 AQ |
1452 | |
1453 | for (i = 0; i < hash->size; i++) { | |
1454 | head = &hash->table[i]; | |
1455 | ||
1456 | rcu_read_lock(); | |
b67bfe0d | 1457 | hlist_for_each_entry_rcu(tt_common, head, hash_entry) { |
058d0e26 | 1458 | /* not yet committed clients have not to be taken into |
9cfc7bd6 SE |
1459 | * account while computing the CRC |
1460 | */ | |
acd34afa | 1461 | if (tt_common->flags & BATADV_TT_CLIENT_NEW) |
058d0e26 | 1462 | continue; |
ced72933 AQ |
1463 | |
1464 | crc ^= crc32c(0, tt_common->addr, ETH_ALEN); | |
a73105b8 | 1465 | } |
a73105b8 AQ |
1466 | rcu_read_unlock(); |
1467 | } | |
1468 | ||
ced72933 | 1469 | return crc; |
a73105b8 AQ |
1470 | } |
1471 | ||
56303d34 | 1472 | static void batadv_tt_req_list_free(struct batadv_priv *bat_priv) |
a73105b8 | 1473 | { |
56303d34 | 1474 | struct batadv_tt_req_node *node, *safe; |
a73105b8 | 1475 | |
807736f6 | 1476 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 | 1477 | |
807736f6 | 1478 | list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { |
a73105b8 AQ |
1479 | list_del(&node->list); |
1480 | kfree(node); | |
1481 | } | |
1482 | ||
807736f6 | 1483 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1484 | } |
1485 | ||
56303d34 SE |
1486 | static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv, |
1487 | struct batadv_orig_node *orig_node, | |
a513088d | 1488 | const unsigned char *tt_buff, |
e1bf0c14 | 1489 | uint16_t tt_num_changes) |
a73105b8 | 1490 | { |
08c36d3e | 1491 | uint16_t tt_buff_len = batadv_tt_len(tt_num_changes); |
a73105b8 AQ |
1492 | |
1493 | /* Replace the old buffer only if I received something in the | |
9cfc7bd6 SE |
1494 | * last OGM (the OGM could carry no changes) |
1495 | */ | |
a73105b8 AQ |
1496 | spin_lock_bh(&orig_node->tt_buff_lock); |
1497 | if (tt_buff_len > 0) { | |
1498 | kfree(orig_node->tt_buff); | |
1499 | orig_node->tt_buff_len = 0; | |
1500 | orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); | |
1501 | if (orig_node->tt_buff) { | |
1502 | memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); | |
1503 | orig_node->tt_buff_len = tt_buff_len; | |
1504 | } | |
1505 | } | |
1506 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1507 | } | |
1508 | ||
56303d34 | 1509 | static void batadv_tt_req_purge(struct batadv_priv *bat_priv) |
a73105b8 | 1510 | { |
56303d34 | 1511 | struct batadv_tt_req_node *node, *safe; |
a73105b8 | 1512 | |
807736f6 SE |
1513 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
1514 | list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { | |
42d0b044 SE |
1515 | if (batadv_has_timed_out(node->issued_at, |
1516 | BATADV_TT_REQUEST_TIMEOUT)) { | |
a73105b8 AQ |
1517 | list_del(&node->list); |
1518 | kfree(node); | |
1519 | } | |
1520 | } | |
807736f6 | 1521 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1522 | } |
1523 | ||
1524 | /* returns the pointer to the new tt_req_node struct if no request | |
9cfc7bd6 SE |
1525 | * has already been issued for this orig_node, NULL otherwise |
1526 | */ | |
56303d34 SE |
1527 | static struct batadv_tt_req_node * |
1528 | batadv_new_tt_req_node(struct batadv_priv *bat_priv, | |
1529 | struct batadv_orig_node *orig_node) | |
a73105b8 | 1530 | { |
56303d34 | 1531 | struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; |
a73105b8 | 1532 | |
807736f6 SE |
1533 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
1534 | list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) { | |
1eda58bf SE |
1535 | if (batadv_compare_eth(tt_req_node_tmp, orig_node) && |
1536 | !batadv_has_timed_out(tt_req_node_tmp->issued_at, | |
42d0b044 | 1537 | BATADV_TT_REQUEST_TIMEOUT)) |
a73105b8 AQ |
1538 | goto unlock; |
1539 | } | |
1540 | ||
1541 | tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); | |
1542 | if (!tt_req_node) | |
1543 | goto unlock; | |
1544 | ||
1545 | memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); | |
1546 | tt_req_node->issued_at = jiffies; | |
1547 | ||
807736f6 | 1548 | list_add(&tt_req_node->list, &bat_priv->tt.req_list); |
a73105b8 | 1549 | unlock: |
807736f6 | 1550 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1551 | return tt_req_node; |
1552 | } | |
1553 | ||
335fbe0f ML |
1554 | /** |
1555 | * batadv_tt_local_valid - verify that given tt entry is a valid one | |
1556 | * @entry_ptr: to be checked local tt entry | |
1557 | * @data_ptr: not used but definition required to satisfy the callback prototype | |
1558 | * | |
1559 | * Returns 1 if the entry is a valid, 0 otherwise. | |
1560 | */ | |
1561 | static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr) | |
058d0e26 | 1562 | { |
56303d34 | 1563 | const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; |
058d0e26 | 1564 | |
acd34afa | 1565 | if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW) |
058d0e26 AQ |
1566 | return 0; |
1567 | return 1; | |
1568 | } | |
1569 | ||
a513088d SE |
1570 | static int batadv_tt_global_valid(const void *entry_ptr, |
1571 | const void *data_ptr) | |
a73105b8 | 1572 | { |
56303d34 SE |
1573 | const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; |
1574 | const struct batadv_tt_global_entry *tt_global_entry; | |
1575 | const struct batadv_orig_node *orig_node = data_ptr; | |
a73105b8 | 1576 | |
30cfd02b AQ |
1577 | if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM || |
1578 | tt_common_entry->flags & BATADV_TT_CLIENT_TEMP) | |
cc47f66e AQ |
1579 | return 0; |
1580 | ||
56303d34 SE |
1581 | tt_global_entry = container_of(tt_common_entry, |
1582 | struct batadv_tt_global_entry, | |
48100bac AQ |
1583 | common); |
1584 | ||
a513088d | 1585 | return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node); |
a73105b8 AQ |
1586 | } |
1587 | ||
335fbe0f ML |
1588 | /** |
1589 | * batadv_tt_tvlv_generate - creates tvlv tt data buffer to fill it with the | |
1590 | * tt entries from the specified tt hash | |
1591 | * @bat_priv: the bat priv with all the soft interface information | |
1592 | * @hash: hash table containing the tt entries | |
1593 | * @tt_len: expected tvlv tt data buffer length in number of bytes | |
1594 | * @valid_cb: function to filter tt change entries | |
1595 | * @cb_data: data passed to the filter function as argument | |
1596 | * | |
1597 | * Returns pointer to allocated tvlv tt data buffer if operation was | |
1598 | * successful or NULL otherwise. | |
1599 | */ | |
1600 | static struct batadv_tvlv_tt_data * | |
1601 | batadv_tt_tvlv_generate(struct batadv_priv *bat_priv, | |
1602 | struct batadv_hashtable *hash, uint16_t tt_len, | |
1603 | int (*valid_cb)(const void *, const void *), | |
1604 | void *cb_data) | |
a73105b8 | 1605 | { |
56303d34 | 1606 | struct batadv_tt_common_entry *tt_common_entry; |
335fbe0f ML |
1607 | struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; |
1608 | struct batadv_tvlv_tt_change *tt_change; | |
a73105b8 | 1609 | struct hlist_head *head; |
335fbe0f ML |
1610 | uint16_t tt_tot, tt_num_entries = 0; |
1611 | ssize_t tvlv_tt_size = sizeof(struct batadv_tvlv_tt_data); | |
c90681b8 | 1612 | uint32_t i; |
a73105b8 | 1613 | |
335fbe0f ML |
1614 | if (tvlv_tt_size + tt_len > bat_priv->soft_iface->mtu) { |
1615 | tt_len = bat_priv->soft_iface->mtu - tvlv_tt_size; | |
1616 | tt_len -= tt_len % sizeof(struct batadv_tvlv_tt_change); | |
a73105b8 | 1617 | } |
a73105b8 | 1618 | |
335fbe0f | 1619 | tt_tot = tt_len / sizeof(struct batadv_tvlv_tt_change); |
a73105b8 | 1620 | |
335fbe0f ML |
1621 | tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data) + tt_len, |
1622 | GFP_ATOMIC); | |
1623 | if (!tvlv_tt_data) | |
1624 | goto out; | |
a73105b8 | 1625 | |
335fbe0f | 1626 | tt_change = (struct batadv_tvlv_tt_change *)(tvlv_tt_data + 1); |
a73105b8 AQ |
1627 | |
1628 | rcu_read_lock(); | |
1629 | for (i = 0; i < hash->size; i++) { | |
1630 | head = &hash->table[i]; | |
1631 | ||
b67bfe0d | 1632 | hlist_for_each_entry_rcu(tt_common_entry, |
a73105b8 | 1633 | head, hash_entry) { |
335fbe0f | 1634 | if (tt_tot == tt_num_entries) |
a73105b8 AQ |
1635 | break; |
1636 | ||
48100bac | 1637 | if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data))) |
a73105b8 AQ |
1638 | continue; |
1639 | ||
48100bac AQ |
1640 | memcpy(tt_change->addr, tt_common_entry->addr, |
1641 | ETH_ALEN); | |
27b37ebf | 1642 | tt_change->flags = tt_common_entry->flags; |
335fbe0f | 1643 | tt_change->reserved = 0; |
a73105b8 | 1644 | |
335fbe0f | 1645 | tt_num_entries++; |
a73105b8 AQ |
1646 | tt_change++; |
1647 | } | |
1648 | } | |
1649 | rcu_read_unlock(); | |
1650 | ||
1651 | out: | |
335fbe0f | 1652 | return tvlv_tt_data; |
a73105b8 AQ |
1653 | } |
1654 | ||
ced72933 AQ |
1655 | /** |
1656 | * batadv_send_tt_request - send a TT Request message to a given node | |
1657 | * @bat_priv: the bat priv with all the soft interface information | |
1658 | * @dst_orig_node: the destination of the message | |
1659 | * @ttvn: the version number that the source of the message is looking for | |
1660 | * @tt_crc: the CRC associated with the version number | |
1661 | * @full_table: ask for the entire translation table if true, while only for the | |
1662 | * last TT diff otherwise | |
1663 | */ | |
56303d34 SE |
1664 | static int batadv_send_tt_request(struct batadv_priv *bat_priv, |
1665 | struct batadv_orig_node *dst_orig_node, | |
ced72933 | 1666 | uint8_t ttvn, uint32_t tt_crc, |
a513088d | 1667 | bool full_table) |
a73105b8 | 1668 | { |
335fbe0f | 1669 | struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; |
56303d34 SE |
1670 | struct batadv_hard_iface *primary_if; |
1671 | struct batadv_tt_req_node *tt_req_node = NULL; | |
335fbe0f | 1672 | bool ret = false; |
a73105b8 | 1673 | |
e5d89254 | 1674 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1675 | if (!primary_if) |
1676 | goto out; | |
1677 | ||
1678 | /* The new tt_req will be issued only if I'm not waiting for a | |
9cfc7bd6 SE |
1679 | * reply from the same orig_node yet |
1680 | */ | |
a513088d | 1681 | tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node); |
a73105b8 AQ |
1682 | if (!tt_req_node) |
1683 | goto out; | |
1684 | ||
335fbe0f ML |
1685 | tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data), GFP_ATOMIC); |
1686 | if (!tvlv_tt_data) | |
a73105b8 AQ |
1687 | goto out; |
1688 | ||
335fbe0f ML |
1689 | tvlv_tt_data->flags = BATADV_TT_REQUEST; |
1690 | tvlv_tt_data->ttvn = ttvn; | |
ced72933 | 1691 | tvlv_tt_data->crc = htonl(tt_crc); |
a73105b8 AQ |
1692 | |
1693 | if (full_table) | |
335fbe0f | 1694 | tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1695 | |
bb351ba0 | 1696 | batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n", |
335fbe0f | 1697 | dst_orig_node->orig, full_table ? 'F' : '.'); |
a73105b8 | 1698 | |
d69909d2 | 1699 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX); |
335fbe0f ML |
1700 | batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr, |
1701 | dst_orig_node->orig, BATADV_TVLV_TT, 1, | |
1702 | tvlv_tt_data, sizeof(*tvlv_tt_data)); | |
1703 | ret = true; | |
a73105b8 AQ |
1704 | |
1705 | out: | |
a73105b8 | 1706 | if (primary_if) |
e5d89254 | 1707 | batadv_hardif_free_ref(primary_if); |
a73105b8 | 1708 | if (ret && tt_req_node) { |
807736f6 | 1709 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 | 1710 | list_del(&tt_req_node->list); |
807736f6 | 1711 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1712 | kfree(tt_req_node); |
1713 | } | |
335fbe0f | 1714 | kfree(tvlv_tt_data); |
a73105b8 AQ |
1715 | return ret; |
1716 | } | |
1717 | ||
335fbe0f ML |
1718 | /** |
1719 | * batadv_send_other_tt_response - send reply to tt request concerning another | |
1720 | * node's translation table | |
1721 | * @bat_priv: the bat priv with all the soft interface information | |
1722 | * @tt_data: tt data containing the tt request information | |
1723 | * @req_src: mac address of tt request sender | |
1724 | * @req_dst: mac address of tt request recipient | |
1725 | * | |
1726 | * Returns true if tt request reply was sent, false otherwise. | |
1727 | */ | |
1728 | static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv, | |
1729 | struct batadv_tvlv_tt_data *tt_data, | |
1730 | uint8_t *req_src, uint8_t *req_dst) | |
a73105b8 | 1731 | { |
170173bf | 1732 | struct batadv_orig_node *req_dst_orig_node; |
56303d34 | 1733 | struct batadv_orig_node *res_dst_orig_node = NULL; |
335fbe0f ML |
1734 | struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; |
1735 | uint8_t orig_ttvn, req_ttvn; | |
1736 | uint16_t tt_len; | |
1737 | bool ret = false, full_table; | |
a73105b8 | 1738 | |
39c75a51 | 1739 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 1740 | "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", |
335fbe0f ML |
1741 | req_src, tt_data->ttvn, req_dst, |
1742 | (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); | |
a73105b8 AQ |
1743 | |
1744 | /* Let's get the orig node of the REAL destination */ | |
335fbe0f | 1745 | req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst); |
a73105b8 AQ |
1746 | if (!req_dst_orig_node) |
1747 | goto out; | |
1748 | ||
335fbe0f | 1749 | res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src); |
a73105b8 AQ |
1750 | if (!res_dst_orig_node) |
1751 | goto out; | |
1752 | ||
a73105b8 | 1753 | orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); |
335fbe0f | 1754 | req_ttvn = tt_data->ttvn; |
a73105b8 | 1755 | |
335fbe0f | 1756 | /* this node doesn't have the requested data */ |
a73105b8 | 1757 | if (orig_ttvn != req_ttvn || |
ced72933 | 1758 | tt_data->crc != htonl(req_dst_orig_node->tt_crc)) |
a73105b8 AQ |
1759 | goto out; |
1760 | ||
015758d0 | 1761 | /* If the full table has been explicitly requested */ |
335fbe0f | 1762 | if (tt_data->flags & BATADV_TT_FULL_TABLE || |
a73105b8 AQ |
1763 | !req_dst_orig_node->tt_buff) |
1764 | full_table = true; | |
1765 | else | |
1766 | full_table = false; | |
1767 | ||
335fbe0f ML |
1768 | /* TT fragmentation hasn't been implemented yet, so send as many |
1769 | * TT entries fit a single packet as possible only | |
9cfc7bd6 | 1770 | */ |
a73105b8 AQ |
1771 | if (!full_table) { |
1772 | spin_lock_bh(&req_dst_orig_node->tt_buff_lock); | |
1773 | tt_len = req_dst_orig_node->tt_buff_len; | |
a73105b8 | 1774 | |
335fbe0f ML |
1775 | tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data) + tt_len, |
1776 | GFP_ATOMIC); | |
1777 | if (!tvlv_tt_data) | |
a73105b8 AQ |
1778 | goto unlock; |
1779 | ||
a73105b8 | 1780 | /* Copy the last orig_node's OGM buffer */ |
335fbe0f | 1781 | memcpy(tvlv_tt_data + 1, req_dst_orig_node->tt_buff, |
a73105b8 | 1782 | req_dst_orig_node->tt_buff_len); |
a73105b8 AQ |
1783 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); |
1784 | } else { | |
96412690 | 1785 | tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size); |
335fbe0f ML |
1786 | tt_len = batadv_tt_len(tt_len); |
1787 | ||
1788 | tvlv_tt_data = batadv_tt_tvlv_generate(bat_priv, | |
1789 | bat_priv->tt.global_hash, | |
1790 | tt_len, | |
1791 | batadv_tt_global_valid, | |
1792 | req_dst_orig_node); | |
1793 | if (!tvlv_tt_data) | |
a73105b8 | 1794 | goto out; |
a73105b8 AQ |
1795 | } |
1796 | ||
335fbe0f ML |
1797 | tvlv_tt_data->flags = BATADV_TT_RESPONSE; |
1798 | tvlv_tt_data->ttvn = req_ttvn; | |
a73105b8 AQ |
1799 | |
1800 | if (full_table) | |
335fbe0f | 1801 | tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1802 | |
39c75a51 | 1803 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
335fbe0f ML |
1804 | "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n", |
1805 | res_dst_orig_node->orig, req_dst_orig_node->orig, | |
1806 | full_table ? 'F' : '.', req_ttvn); | |
a73105b8 | 1807 | |
d69909d2 | 1808 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); |
f8214865 | 1809 | |
335fbe0f ML |
1810 | batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig, |
1811 | req_src, BATADV_TVLV_TT, 1, | |
1812 | tvlv_tt_data, sizeof(*tvlv_tt_data) + tt_len); | |
e91ecfc6 | 1813 | |
335fbe0f | 1814 | ret = true; |
a73105b8 AQ |
1815 | goto out; |
1816 | ||
1817 | unlock: | |
1818 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1819 | ||
1820 | out: | |
1821 | if (res_dst_orig_node) | |
7d211efc | 1822 | batadv_orig_node_free_ref(res_dst_orig_node); |
a73105b8 | 1823 | if (req_dst_orig_node) |
7d211efc | 1824 | batadv_orig_node_free_ref(req_dst_orig_node); |
335fbe0f | 1825 | kfree(tvlv_tt_data); |
a73105b8 | 1826 | return ret; |
a73105b8 | 1827 | } |
96412690 | 1828 | |
335fbe0f ML |
1829 | /** |
1830 | * batadv_send_my_tt_response - send reply to tt request concerning this node's | |
1831 | * translation table | |
1832 | * @bat_priv: the bat priv with all the soft interface information | |
1833 | * @tt_data: tt data containing the tt request information | |
1834 | * @req_src: mac address of tt request sender | |
1835 | * | |
1836 | * Returns true if tt request reply was sent, false otherwise. | |
1837 | */ | |
1838 | static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv, | |
1839 | struct batadv_tvlv_tt_data *tt_data, | |
1840 | uint8_t *req_src) | |
a73105b8 | 1841 | { |
335fbe0f | 1842 | struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; |
170173bf | 1843 | struct batadv_orig_node *orig_node; |
56303d34 | 1844 | struct batadv_hard_iface *primary_if = NULL; |
335fbe0f | 1845 | uint8_t my_ttvn, req_ttvn; |
a73105b8 | 1846 | bool full_table; |
335fbe0f | 1847 | uint16_t tt_len; |
a73105b8 | 1848 | |
39c75a51 | 1849 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 1850 | "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", |
335fbe0f ML |
1851 | req_src, tt_data->ttvn, |
1852 | (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); | |
a73105b8 AQ |
1853 | |
1854 | ||
807736f6 | 1855 | my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); |
335fbe0f | 1856 | req_ttvn = tt_data->ttvn; |
a73105b8 | 1857 | |
335fbe0f | 1858 | orig_node = batadv_orig_hash_find(bat_priv, req_src); |
a73105b8 AQ |
1859 | if (!orig_node) |
1860 | goto out; | |
1861 | ||
e5d89254 | 1862 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1863 | if (!primary_if) |
1864 | goto out; | |
1865 | ||
1866 | /* If the full table has been explicitly requested or the gap | |
9cfc7bd6 SE |
1867 | * is too big send the whole local translation table |
1868 | */ | |
335fbe0f | 1869 | if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn || |
807736f6 | 1870 | !bat_priv->tt.last_changeset) |
a73105b8 AQ |
1871 | full_table = true; |
1872 | else | |
1873 | full_table = false; | |
1874 | ||
335fbe0f ML |
1875 | /* TT fragmentation hasn't been implemented yet, so send as many |
1876 | * TT entries fit a single packet as possible only | |
9cfc7bd6 | 1877 | */ |
a73105b8 | 1878 | if (!full_table) { |
807736f6 SE |
1879 | spin_lock_bh(&bat_priv->tt.last_changeset_lock); |
1880 | tt_len = bat_priv->tt.last_changeset_len; | |
a73105b8 | 1881 | |
335fbe0f ML |
1882 | tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data) + tt_len, |
1883 | GFP_ATOMIC); | |
1884 | if (!tvlv_tt_data) | |
a73105b8 AQ |
1885 | goto unlock; |
1886 | ||
335fbe0f ML |
1887 | /* Copy the last orig_node's OGM buffer */ |
1888 | memcpy(tvlv_tt_data + 1, bat_priv->tt.last_changeset, | |
807736f6 SE |
1889 | bat_priv->tt.last_changeset_len); |
1890 | spin_unlock_bh(&bat_priv->tt.last_changeset_lock); | |
a73105b8 | 1891 | } else { |
807736f6 | 1892 | tt_len = (uint16_t)atomic_read(&bat_priv->tt.local_entry_num); |
335fbe0f ML |
1893 | tt_len = batadv_tt_len(tt_len); |
1894 | req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
1895 | ||
1896 | tvlv_tt_data = batadv_tt_tvlv_generate(bat_priv, | |
1897 | bat_priv->tt.local_hash, | |
1898 | tt_len, | |
1899 | batadv_tt_local_valid, | |
1900 | NULL); | |
1901 | if (!tvlv_tt_data) | |
a73105b8 | 1902 | goto out; |
a73105b8 AQ |
1903 | } |
1904 | ||
335fbe0f ML |
1905 | tvlv_tt_data->flags = BATADV_TT_RESPONSE; |
1906 | tvlv_tt_data->ttvn = req_ttvn; | |
a73105b8 AQ |
1907 | |
1908 | if (full_table) | |
335fbe0f | 1909 | tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1910 | |
39c75a51 | 1911 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
335fbe0f ML |
1912 | "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n", |
1913 | orig_node->orig, full_table ? 'F' : '.', req_ttvn); | |
a73105b8 | 1914 | |
d69909d2 | 1915 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); |
f8214865 | 1916 | |
335fbe0f ML |
1917 | batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr, |
1918 | req_src, BATADV_TVLV_TT, 1, | |
1919 | tvlv_tt_data, sizeof(*tvlv_tt_data) + tt_len); | |
1920 | ||
a73105b8 AQ |
1921 | goto out; |
1922 | ||
1923 | unlock: | |
807736f6 | 1924 | spin_unlock_bh(&bat_priv->tt.last_changeset_lock); |
a73105b8 AQ |
1925 | out: |
1926 | if (orig_node) | |
7d211efc | 1927 | batadv_orig_node_free_ref(orig_node); |
a73105b8 | 1928 | if (primary_if) |
e5d89254 | 1929 | batadv_hardif_free_ref(primary_if); |
335fbe0f ML |
1930 | kfree(tvlv_tt_data); |
1931 | /* The packet was for this host, so it doesn't need to be re-routed */ | |
a73105b8 AQ |
1932 | return true; |
1933 | } | |
1934 | ||
335fbe0f ML |
1935 | /** |
1936 | * batadv_send_tt_response - send reply to tt request | |
1937 | * @bat_priv: the bat priv with all the soft interface information | |
1938 | * @tt_data: tt data containing the tt request information | |
1939 | * @req_src: mac address of tt request sender | |
1940 | * @req_dst: mac address of tt request recipient | |
1941 | * | |
1942 | * Returns true if tt request reply was sent, false otherwise. | |
1943 | */ | |
1944 | static bool batadv_send_tt_response(struct batadv_priv *bat_priv, | |
1945 | struct batadv_tvlv_tt_data *tt_data, | |
1946 | uint8_t *req_src, uint8_t *req_dst) | |
a73105b8 | 1947 | { |
335fbe0f | 1948 | if (batadv_is_my_mac(bat_priv, req_dst)) { |
20ff9d59 | 1949 | /* don't answer backbone gws! */ |
335fbe0f | 1950 | if (batadv_bla_is_backbone_gw_orig(bat_priv, req_src)) |
20ff9d59 SW |
1951 | return true; |
1952 | ||
335fbe0f | 1953 | return batadv_send_my_tt_response(bat_priv, tt_data, req_src); |
20ff9d59 | 1954 | } else { |
335fbe0f ML |
1955 | return batadv_send_other_tt_response(bat_priv, tt_data, |
1956 | req_src, req_dst); | |
20ff9d59 | 1957 | } |
a73105b8 AQ |
1958 | } |
1959 | ||
56303d34 SE |
1960 | static void _batadv_tt_update_changes(struct batadv_priv *bat_priv, |
1961 | struct batadv_orig_node *orig_node, | |
335fbe0f | 1962 | struct batadv_tvlv_tt_change *tt_change, |
a513088d | 1963 | uint16_t tt_num_changes, uint8_t ttvn) |
a73105b8 AQ |
1964 | { |
1965 | int i; | |
a513088d | 1966 | int roams; |
a73105b8 AQ |
1967 | |
1968 | for (i = 0; i < tt_num_changes; i++) { | |
acd34afa SE |
1969 | if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) { |
1970 | roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM; | |
a513088d SE |
1971 | batadv_tt_global_del(bat_priv, orig_node, |
1972 | (tt_change + i)->addr, | |
d4f44692 AQ |
1973 | "tt removed by changes", |
1974 | roams); | |
08c36d3e | 1975 | } else { |
08c36d3e | 1976 | if (!batadv_tt_global_add(bat_priv, orig_node, |
d4f44692 AQ |
1977 | (tt_change + i)->addr, |
1978 | (tt_change + i)->flags, ttvn)) | |
a73105b8 AQ |
1979 | /* In case of problem while storing a |
1980 | * global_entry, we stop the updating | |
1981 | * procedure without committing the | |
1982 | * ttvn change. This will avoid to send | |
1983 | * corrupted data on tt_request | |
1984 | */ | |
1985 | return; | |
08c36d3e | 1986 | } |
a73105b8 | 1987 | } |
17071578 | 1988 | orig_node->tt_initialised = true; |
a73105b8 AQ |
1989 | } |
1990 | ||
56303d34 | 1991 | static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv, |
335fbe0f ML |
1992 | struct batadv_tvlv_tt_data *tt_data, |
1993 | uint8_t *resp_src, uint16_t num_entries) | |
a73105b8 | 1994 | { |
170173bf | 1995 | struct batadv_orig_node *orig_node; |
a73105b8 | 1996 | |
335fbe0f | 1997 | orig_node = batadv_orig_hash_find(bat_priv, resp_src); |
a73105b8 AQ |
1998 | if (!orig_node) |
1999 | goto out; | |
2000 | ||
2001 | /* Purge the old table first.. */ | |
08c36d3e | 2002 | batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table"); |
a73105b8 | 2003 | |
a513088d | 2004 | _batadv_tt_update_changes(bat_priv, orig_node, |
335fbe0f ML |
2005 | (struct batadv_tvlv_tt_change *)(tt_data + 1), |
2006 | num_entries, tt_data->ttvn); | |
a73105b8 AQ |
2007 | |
2008 | spin_lock_bh(&orig_node->tt_buff_lock); | |
2009 | kfree(orig_node->tt_buff); | |
2010 | orig_node->tt_buff_len = 0; | |
2011 | orig_node->tt_buff = NULL; | |
2012 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
2013 | ||
335fbe0f | 2014 | atomic_set(&orig_node->last_ttvn, tt_data->ttvn); |
a73105b8 AQ |
2015 | |
2016 | out: | |
2017 | if (orig_node) | |
7d211efc | 2018 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
2019 | } |
2020 | ||
56303d34 SE |
2021 | static void batadv_tt_update_changes(struct batadv_priv *bat_priv, |
2022 | struct batadv_orig_node *orig_node, | |
a513088d | 2023 | uint16_t tt_num_changes, uint8_t ttvn, |
335fbe0f | 2024 | struct batadv_tvlv_tt_change *tt_change) |
a73105b8 | 2025 | { |
a513088d SE |
2026 | _batadv_tt_update_changes(bat_priv, orig_node, tt_change, |
2027 | tt_num_changes, ttvn); | |
a73105b8 | 2028 | |
a513088d SE |
2029 | batadv_tt_save_orig_buffer(bat_priv, orig_node, |
2030 | (unsigned char *)tt_change, tt_num_changes); | |
a73105b8 AQ |
2031 | atomic_set(&orig_node->last_ttvn, ttvn); |
2032 | } | |
2033 | ||
56303d34 | 2034 | bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr) |
a73105b8 | 2035 | { |
170173bf | 2036 | struct batadv_tt_local_entry *tt_local_entry; |
7683fdc1 | 2037 | bool ret = false; |
a73105b8 | 2038 | |
a513088d | 2039 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
2040 | if (!tt_local_entry) |
2041 | goto out; | |
058d0e26 | 2042 | /* Check if the client has been logically deleted (but is kept for |
9cfc7bd6 SE |
2043 | * consistency purpose) |
2044 | */ | |
7c1fd91d AQ |
2045 | if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) || |
2046 | (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM)) | |
058d0e26 | 2047 | goto out; |
7683fdc1 AQ |
2048 | ret = true; |
2049 | out: | |
a73105b8 | 2050 | if (tt_local_entry) |
a513088d | 2051 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7683fdc1 | 2052 | return ret; |
a73105b8 AQ |
2053 | } |
2054 | ||
335fbe0f ML |
2055 | /** |
2056 | * batadv_handle_tt_response - process incoming tt reply | |
2057 | * @bat_priv: the bat priv with all the soft interface information | |
2058 | * @tt_data: tt data containing the tt request information | |
2059 | * @resp_src: mac address of tt reply sender | |
2060 | * @num_entries: number of tt change entries appended to the tt data | |
2061 | */ | |
2062 | static void batadv_handle_tt_response(struct batadv_priv *bat_priv, | |
2063 | struct batadv_tvlv_tt_data *tt_data, | |
2064 | uint8_t *resp_src, uint16_t num_entries) | |
a73105b8 | 2065 | { |
56303d34 SE |
2066 | struct batadv_tt_req_node *node, *safe; |
2067 | struct batadv_orig_node *orig_node = NULL; | |
335fbe0f | 2068 | struct batadv_tvlv_tt_change *tt_change; |
a73105b8 | 2069 | |
39c75a51 | 2070 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 2071 | "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", |
335fbe0f ML |
2072 | resp_src, tt_data->ttvn, num_entries, |
2073 | (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); | |
a73105b8 | 2074 | |
20ff9d59 | 2075 | /* we should have never asked a backbone gw */ |
335fbe0f | 2076 | if (batadv_bla_is_backbone_gw_orig(bat_priv, resp_src)) |
20ff9d59 SW |
2077 | goto out; |
2078 | ||
335fbe0f | 2079 | orig_node = batadv_orig_hash_find(bat_priv, resp_src); |
a73105b8 AQ |
2080 | if (!orig_node) |
2081 | goto out; | |
2082 | ||
335fbe0f ML |
2083 | if (tt_data->flags & BATADV_TT_FULL_TABLE) { |
2084 | batadv_tt_fill_gtable(bat_priv, tt_data, resp_src, num_entries); | |
96412690 | 2085 | } else { |
335fbe0f ML |
2086 | tt_change = (struct batadv_tvlv_tt_change *)(tt_data + 1); |
2087 | batadv_tt_update_changes(bat_priv, orig_node, num_entries, | |
2088 | tt_data->ttvn, tt_change); | |
96412690 | 2089 | } |
a73105b8 AQ |
2090 | |
2091 | /* Delete the tt_req_node from pending tt_requests list */ | |
807736f6 SE |
2092 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
2093 | list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { | |
335fbe0f | 2094 | if (!batadv_compare_eth(node->addr, resp_src)) |
a73105b8 AQ |
2095 | continue; |
2096 | list_del(&node->list); | |
2097 | kfree(node); | |
2098 | } | |
807736f6 | 2099 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
2100 | |
2101 | /* Recalculate the CRC for this orig_node and store it */ | |
a513088d | 2102 | orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); |
a73105b8 AQ |
2103 | out: |
2104 | if (orig_node) | |
7d211efc | 2105 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
2106 | } |
2107 | ||
56303d34 | 2108 | static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv) |
a73105b8 | 2109 | { |
56303d34 | 2110 | struct batadv_tt_roam_node *node, *safe; |
a73105b8 | 2111 | |
807736f6 | 2112 | spin_lock_bh(&bat_priv->tt.roam_list_lock); |
a73105b8 | 2113 | |
807736f6 | 2114 | list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { |
cc47f66e AQ |
2115 | list_del(&node->list); |
2116 | kfree(node); | |
2117 | } | |
2118 | ||
807736f6 | 2119 | spin_unlock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e AQ |
2120 | } |
2121 | ||
56303d34 | 2122 | static void batadv_tt_roam_purge(struct batadv_priv *bat_priv) |
cc47f66e | 2123 | { |
56303d34 | 2124 | struct batadv_tt_roam_node *node, *safe; |
cc47f66e | 2125 | |
807736f6 SE |
2126 | spin_lock_bh(&bat_priv->tt.roam_list_lock); |
2127 | list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { | |
42d0b044 SE |
2128 | if (!batadv_has_timed_out(node->first_time, |
2129 | BATADV_ROAMING_MAX_TIME)) | |
cc47f66e AQ |
2130 | continue; |
2131 | ||
2132 | list_del(&node->list); | |
2133 | kfree(node); | |
2134 | } | |
807736f6 | 2135 | spin_unlock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e AQ |
2136 | } |
2137 | ||
2138 | /* This function checks whether the client already reached the | |
2139 | * maximum number of possible roaming phases. In this case the ROAMING_ADV | |
2140 | * will not be sent. | |
2141 | * | |
9cfc7bd6 SE |
2142 | * returns true if the ROAMING_ADV can be sent, false otherwise |
2143 | */ | |
56303d34 | 2144 | static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, |
a513088d | 2145 | uint8_t *client) |
cc47f66e | 2146 | { |
56303d34 | 2147 | struct batadv_tt_roam_node *tt_roam_node; |
cc47f66e AQ |
2148 | bool ret = false; |
2149 | ||
807736f6 | 2150 | spin_lock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e | 2151 | /* The new tt_req will be issued only if I'm not waiting for a |
9cfc7bd6 SE |
2152 | * reply from the same orig_node yet |
2153 | */ | |
807736f6 | 2154 | list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) { |
1eda58bf | 2155 | if (!batadv_compare_eth(tt_roam_node->addr, client)) |
cc47f66e AQ |
2156 | continue; |
2157 | ||
1eda58bf | 2158 | if (batadv_has_timed_out(tt_roam_node->first_time, |
42d0b044 | 2159 | BATADV_ROAMING_MAX_TIME)) |
cc47f66e AQ |
2160 | continue; |
2161 | ||
3e34819e | 2162 | if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter)) |
cc47f66e AQ |
2163 | /* Sorry, you roamed too many times! */ |
2164 | goto unlock; | |
2165 | ret = true; | |
2166 | break; | |
2167 | } | |
2168 | ||
2169 | if (!ret) { | |
2170 | tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); | |
2171 | if (!tt_roam_node) | |
2172 | goto unlock; | |
2173 | ||
2174 | tt_roam_node->first_time = jiffies; | |
42d0b044 SE |
2175 | atomic_set(&tt_roam_node->counter, |
2176 | BATADV_ROAMING_MAX_COUNT - 1); | |
cc47f66e AQ |
2177 | memcpy(tt_roam_node->addr, client, ETH_ALEN); |
2178 | ||
807736f6 | 2179 | list_add(&tt_roam_node->list, &bat_priv->tt.roam_list); |
cc47f66e AQ |
2180 | ret = true; |
2181 | } | |
2182 | ||
2183 | unlock: | |
807736f6 | 2184 | spin_unlock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e AQ |
2185 | return ret; |
2186 | } | |
2187 | ||
56303d34 SE |
2188 | static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, |
2189 | struct batadv_orig_node *orig_node) | |
cc47f66e | 2190 | { |
56303d34 | 2191 | struct batadv_hard_iface *primary_if; |
122edaa0 ML |
2192 | struct batadv_tvlv_roam_adv tvlv_roam; |
2193 | ||
2194 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2195 | if (!primary_if) | |
2196 | goto out; | |
cc47f66e AQ |
2197 | |
2198 | /* before going on we have to check whether the client has | |
9cfc7bd6 SE |
2199 | * already roamed to us too many times |
2200 | */ | |
a513088d | 2201 | if (!batadv_tt_check_roam_count(bat_priv, client)) |
cc47f66e AQ |
2202 | goto out; |
2203 | ||
39c75a51 | 2204 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
bb351ba0 MH |
2205 | "Sending ROAMING_ADV to %pM (client %pM)\n", |
2206 | orig_node->orig, client); | |
cc47f66e | 2207 | |
d69909d2 | 2208 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX); |
f8214865 | 2209 | |
122edaa0 ML |
2210 | memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client)); |
2211 | tvlv_roam.reserved = 0; | |
2212 | ||
2213 | batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr, | |
2214 | orig_node->orig, BATADV_TVLV_ROAM, 1, | |
2215 | &tvlv_roam, sizeof(tvlv_roam)); | |
cc47f66e AQ |
2216 | |
2217 | out: | |
122edaa0 ML |
2218 | if (primary_if) |
2219 | batadv_hardif_free_ref(primary_if); | |
a73105b8 AQ |
2220 | } |
2221 | ||
a513088d | 2222 | static void batadv_tt_purge(struct work_struct *work) |
a73105b8 | 2223 | { |
56303d34 | 2224 | struct delayed_work *delayed_work; |
807736f6 | 2225 | struct batadv_priv_tt *priv_tt; |
56303d34 SE |
2226 | struct batadv_priv *bat_priv; |
2227 | ||
2228 | delayed_work = container_of(work, struct delayed_work, work); | |
807736f6 SE |
2229 | priv_tt = container_of(delayed_work, struct batadv_priv_tt, work); |
2230 | bat_priv = container_of(priv_tt, struct batadv_priv, tt); | |
a73105b8 | 2231 | |
a513088d | 2232 | batadv_tt_local_purge(bat_priv); |
30cfd02b | 2233 | batadv_tt_global_purge(bat_priv); |
a513088d SE |
2234 | batadv_tt_req_purge(bat_priv); |
2235 | batadv_tt_roam_purge(bat_priv); | |
a73105b8 | 2236 | |
72414442 AQ |
2237 | queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work, |
2238 | msecs_to_jiffies(BATADV_TT_WORK_PERIOD)); | |
a73105b8 | 2239 | } |
cc47f66e | 2240 | |
56303d34 | 2241 | void batadv_tt_free(struct batadv_priv *bat_priv) |
cc47f66e | 2242 | { |
e1bf0c14 ML |
2243 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1); |
2244 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1); | |
2245 | ||
807736f6 | 2246 | cancel_delayed_work_sync(&bat_priv->tt.work); |
cc47f66e | 2247 | |
a513088d SE |
2248 | batadv_tt_local_table_free(bat_priv); |
2249 | batadv_tt_global_table_free(bat_priv); | |
2250 | batadv_tt_req_list_free(bat_priv); | |
2251 | batadv_tt_changes_list_free(bat_priv); | |
2252 | batadv_tt_roam_list_free(bat_priv); | |
cc47f66e | 2253 | |
807736f6 | 2254 | kfree(bat_priv->tt.last_changeset); |
cc47f66e | 2255 | } |
058d0e26 | 2256 | |
697f2531 | 2257 | /* This function will enable or disable the specified flags for all the entries |
9cfc7bd6 SE |
2258 | * in the given hash table and returns the number of modified entries |
2259 | */ | |
5bf74e9c SE |
2260 | static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash, |
2261 | uint16_t flags, bool enable) | |
058d0e26 | 2262 | { |
c90681b8 | 2263 | uint32_t i; |
697f2531 | 2264 | uint16_t changed_num = 0; |
058d0e26 | 2265 | struct hlist_head *head; |
56303d34 | 2266 | struct batadv_tt_common_entry *tt_common_entry; |
058d0e26 AQ |
2267 | |
2268 | if (!hash) | |
697f2531 | 2269 | goto out; |
058d0e26 AQ |
2270 | |
2271 | for (i = 0; i < hash->size; i++) { | |
2272 | head = &hash->table[i]; | |
2273 | ||
2274 | rcu_read_lock(); | |
b67bfe0d | 2275 | hlist_for_each_entry_rcu(tt_common_entry, |
058d0e26 | 2276 | head, hash_entry) { |
697f2531 AQ |
2277 | if (enable) { |
2278 | if ((tt_common_entry->flags & flags) == flags) | |
2279 | continue; | |
2280 | tt_common_entry->flags |= flags; | |
2281 | } else { | |
2282 | if (!(tt_common_entry->flags & flags)) | |
2283 | continue; | |
2284 | tt_common_entry->flags &= ~flags; | |
2285 | } | |
2286 | changed_num++; | |
058d0e26 AQ |
2287 | } |
2288 | rcu_read_unlock(); | |
2289 | } | |
697f2531 AQ |
2290 | out: |
2291 | return changed_num; | |
058d0e26 AQ |
2292 | } |
2293 | ||
acd34afa | 2294 | /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */ |
56303d34 | 2295 | static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) |
058d0e26 | 2296 | { |
807736f6 | 2297 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
56303d34 SE |
2298 | struct batadv_tt_common_entry *tt_common; |
2299 | struct batadv_tt_local_entry *tt_local; | |
b67bfe0d | 2300 | struct hlist_node *node_tmp; |
058d0e26 AQ |
2301 | struct hlist_head *head; |
2302 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
c90681b8 | 2303 | uint32_t i; |
058d0e26 AQ |
2304 | |
2305 | if (!hash) | |
2306 | return; | |
2307 | ||
2308 | for (i = 0; i < hash->size; i++) { | |
2309 | head = &hash->table[i]; | |
2310 | list_lock = &hash->list_locks[i]; | |
2311 | ||
2312 | spin_lock_bh(list_lock); | |
b67bfe0d | 2313 | hlist_for_each_entry_safe(tt_common, node_tmp, head, |
acd34afa SE |
2314 | hash_entry) { |
2315 | if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING)) | |
058d0e26 AQ |
2316 | continue; |
2317 | ||
39c75a51 | 2318 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 2319 | "Deleting local tt entry (%pM): pending\n", |
acd34afa | 2320 | tt_common->addr); |
058d0e26 | 2321 | |
807736f6 | 2322 | atomic_dec(&bat_priv->tt.local_entry_num); |
b67bfe0d | 2323 | hlist_del_rcu(&tt_common->hash_entry); |
56303d34 SE |
2324 | tt_local = container_of(tt_common, |
2325 | struct batadv_tt_local_entry, | |
2326 | common); | |
2327 | batadv_tt_local_entry_free_ref(tt_local); | |
058d0e26 AQ |
2328 | } |
2329 | spin_unlock_bh(list_lock); | |
2330 | } | |
058d0e26 AQ |
2331 | } |
2332 | ||
e1bf0c14 ML |
2333 | /** |
2334 | * batadv_tt_local_commit_changes - commit all pending local tt changes which | |
2335 | * have been queued in the time since the last commit | |
2336 | * @bat_priv: the bat priv with all the soft interface information | |
2337 | */ | |
2338 | void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv) | |
058d0e26 | 2339 | { |
be9aa4c1 ML |
2340 | uint16_t changed_num = 0; |
2341 | ||
e1bf0c14 ML |
2342 | if (atomic_read(&bat_priv->tt.local_changes) < 1) { |
2343 | if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt)) | |
2344 | batadv_tt_tvlv_container_update(bat_priv); | |
2345 | return; | |
2346 | } | |
be9aa4c1 | 2347 | |
807736f6 | 2348 | changed_num = batadv_tt_set_flags(bat_priv->tt.local_hash, |
acd34afa | 2349 | BATADV_TT_CLIENT_NEW, false); |
be9aa4c1 ML |
2350 | |
2351 | /* all reset entries have to be counted as local entries */ | |
807736f6 | 2352 | atomic_add(changed_num, &bat_priv->tt.local_entry_num); |
a513088d | 2353 | batadv_tt_local_purge_pending_clients(bat_priv); |
807736f6 | 2354 | bat_priv->tt.local_crc = batadv_tt_local_crc(bat_priv); |
058d0e26 AQ |
2355 | |
2356 | /* Increment the TTVN only once per OGM interval */ | |
807736f6 | 2357 | atomic_inc(&bat_priv->tt.vn); |
39c75a51 | 2358 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 2359 | "Local changes committed, updating to ttvn %u\n", |
807736f6 | 2360 | (uint8_t)atomic_read(&bat_priv->tt.vn)); |
be9aa4c1 ML |
2361 | |
2362 | /* reset the sending counter */ | |
807736f6 | 2363 | atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX); |
e1bf0c14 | 2364 | batadv_tt_tvlv_container_update(bat_priv); |
058d0e26 | 2365 | } |
59b699cd | 2366 | |
56303d34 | 2367 | bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src, |
08c36d3e | 2368 | uint8_t *dst) |
59b699cd | 2369 | { |
56303d34 SE |
2370 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
2371 | struct batadv_tt_global_entry *tt_global_entry = NULL; | |
5870adc6 | 2372 | bool ret = false; |
59b699cd AQ |
2373 | |
2374 | if (!atomic_read(&bat_priv->ap_isolation)) | |
5870adc6 | 2375 | goto out; |
59b699cd | 2376 | |
a513088d | 2377 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst); |
59b699cd AQ |
2378 | if (!tt_local_entry) |
2379 | goto out; | |
2380 | ||
a513088d | 2381 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, src); |
59b699cd AQ |
2382 | if (!tt_global_entry) |
2383 | goto out; | |
2384 | ||
1f129fef | 2385 | if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) |
59b699cd AQ |
2386 | goto out; |
2387 | ||
5870adc6 | 2388 | ret = true; |
59b699cd AQ |
2389 | |
2390 | out: | |
2391 | if (tt_global_entry) | |
a513088d | 2392 | batadv_tt_global_entry_free_ref(tt_global_entry); |
59b699cd | 2393 | if (tt_local_entry) |
a513088d | 2394 | batadv_tt_local_entry_free_ref(tt_local_entry); |
59b699cd AQ |
2395 | return ret; |
2396 | } | |
a943cac1 | 2397 | |
e1bf0c14 ML |
2398 | /** |
2399 | * batadv_tt_update_orig - update global translation table with new tt | |
2400 | * information received via ogms | |
2401 | * @bat_priv: the bat priv with all the soft interface information | |
2402 | * @orig: the orig_node of the ogm | |
2403 | * @tt_buff: buffer holding the tt information | |
2404 | * @tt_num_changes: number of tt changes inside the tt buffer | |
2405 | * @ttvn: translation table version number of this changeset | |
ced72933 | 2406 | * @tt_crc: crc32 checksum of orig node's translation table |
e1bf0c14 ML |
2407 | */ |
2408 | static void batadv_tt_update_orig(struct batadv_priv *bat_priv, | |
2409 | struct batadv_orig_node *orig_node, | |
2410 | const unsigned char *tt_buff, | |
2411 | uint16_t tt_num_changes, uint8_t ttvn, | |
ced72933 | 2412 | uint32_t tt_crc) |
a943cac1 ML |
2413 | { |
2414 | uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
2415 | bool full_table = true; | |
335fbe0f | 2416 | struct batadv_tvlv_tt_change *tt_change; |
a943cac1 | 2417 | |
20ff9d59 | 2418 | /* don't care about a backbone gateways updates. */ |
08adf151 | 2419 | if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) |
20ff9d59 SW |
2420 | return; |
2421 | ||
17071578 | 2422 | /* orig table not initialised AND first diff is in the OGM OR the ttvn |
9cfc7bd6 SE |
2423 | * increased by one -> we can apply the attached changes |
2424 | */ | |
17071578 AQ |
2425 | if ((!orig_node->tt_initialised && ttvn == 1) || |
2426 | ttvn - orig_ttvn == 1) { | |
a943cac1 | 2427 | /* the OGM could not contain the changes due to their size or |
42d0b044 SE |
2428 | * because they have already been sent BATADV_TT_OGM_APPEND_MAX |
2429 | * times. | |
9cfc7bd6 SE |
2430 | * In this case send a tt request |
2431 | */ | |
a943cac1 ML |
2432 | if (!tt_num_changes) { |
2433 | full_table = false; | |
2434 | goto request_table; | |
2435 | } | |
2436 | ||
335fbe0f | 2437 | tt_change = (struct batadv_tvlv_tt_change *)tt_buff; |
a513088d | 2438 | batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes, |
96412690 | 2439 | ttvn, tt_change); |
a943cac1 ML |
2440 | |
2441 | /* Even if we received the precomputed crc with the OGM, we | |
2442 | * prefer to recompute it to spot any possible inconsistency | |
9cfc7bd6 SE |
2443 | * in the global table |
2444 | */ | |
a513088d | 2445 | orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); |
a943cac1 ML |
2446 | |
2447 | /* The ttvn alone is not enough to guarantee consistency | |
2448 | * because a single value could represent different states | |
2449 | * (due to the wrap around). Thus a node has to check whether | |
2450 | * the resulting table (after applying the changes) is still | |
2451 | * consistent or not. E.g. a node could disconnect while its | |
2452 | * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case | |
2453 | * checking the CRC value is mandatory to detect the | |
9cfc7bd6 SE |
2454 | * inconsistency |
2455 | */ | |
a943cac1 ML |
2456 | if (orig_node->tt_crc != tt_crc) |
2457 | goto request_table; | |
a943cac1 ML |
2458 | } else { |
2459 | /* if we missed more than one change or our tables are not | |
9cfc7bd6 SE |
2460 | * in sync anymore -> request fresh tt data |
2461 | */ | |
17071578 AQ |
2462 | if (!orig_node->tt_initialised || ttvn != orig_ttvn || |
2463 | orig_node->tt_crc != tt_crc) { | |
a943cac1 | 2464 | request_table: |
39c75a51 | 2465 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
ced72933 | 2466 | "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 |
2467 | orig_node->orig, ttvn, orig_ttvn, tt_crc, |
2468 | orig_node->tt_crc, tt_num_changes); | |
a513088d SE |
2469 | batadv_send_tt_request(bat_priv, orig_node, ttvn, |
2470 | tt_crc, full_table); | |
a943cac1 ML |
2471 | return; |
2472 | } | |
2473 | } | |
2474 | } | |
3275e7cc AQ |
2475 | |
2476 | /* returns true whether we know that the client has moved from its old | |
2477 | * originator to another one. This entry is kept is still kept for consistency | |
2478 | * purposes | |
2479 | */ | |
56303d34 | 2480 | bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv, |
08c36d3e | 2481 | uint8_t *addr) |
3275e7cc | 2482 | { |
56303d34 | 2483 | struct batadv_tt_global_entry *tt_global_entry; |
3275e7cc AQ |
2484 | bool ret = false; |
2485 | ||
a513088d | 2486 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
3275e7cc AQ |
2487 | if (!tt_global_entry) |
2488 | goto out; | |
2489 | ||
c1d07431 | 2490 | ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM; |
a513088d | 2491 | batadv_tt_global_entry_free_ref(tt_global_entry); |
3275e7cc AQ |
2492 | out: |
2493 | return ret; | |
2494 | } | |
30cfd02b | 2495 | |
7c1fd91d AQ |
2496 | /** |
2497 | * batadv_tt_local_client_is_roaming - tells whether the client is roaming | |
2498 | * @bat_priv: the bat priv with all the soft interface information | |
2499 | * @addr: the MAC address of the local client to query | |
2500 | * | |
2501 | * Returns true if the local client is known to be roaming (it is not served by | |
2502 | * this node anymore) or not. If yes, the client is still present in the table | |
2503 | * to keep the latter consistent with the node TTVN | |
2504 | */ | |
2505 | bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv, | |
2506 | uint8_t *addr) | |
2507 | { | |
2508 | struct batadv_tt_local_entry *tt_local_entry; | |
2509 | bool ret = false; | |
2510 | ||
2511 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); | |
2512 | if (!tt_local_entry) | |
2513 | goto out; | |
2514 | ||
2515 | ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM; | |
2516 | batadv_tt_local_entry_free_ref(tt_local_entry); | |
2517 | out: | |
2518 | return ret; | |
7c1fd91d AQ |
2519 | } |
2520 | ||
30cfd02b AQ |
2521 | bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv, |
2522 | struct batadv_orig_node *orig_node, | |
2523 | const unsigned char *addr) | |
2524 | { | |
2525 | bool ret = false; | |
2526 | ||
1f36aebc AQ |
2527 | /* if the originator is a backbone node (meaning it belongs to the same |
2528 | * LAN of this node) the temporary client must not be added because to | |
2529 | * reach such destination the node must use the LAN instead of the mesh | |
2530 | */ | |
2531 | if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) | |
2532 | goto out; | |
2533 | ||
30cfd02b AQ |
2534 | if (!batadv_tt_global_add(bat_priv, orig_node, addr, |
2535 | BATADV_TT_CLIENT_TEMP, | |
2536 | atomic_read(&orig_node->last_ttvn))) | |
2537 | goto out; | |
2538 | ||
2539 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
2540 | "Added temporary global client (addr: %pM orig: %pM)\n", | |
2541 | addr, orig_node->orig); | |
2542 | ret = true; | |
2543 | out: | |
2544 | return ret; | |
2545 | } | |
e1bf0c14 ML |
2546 | |
2547 | /** | |
2548 | * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container | |
2549 | * @bat_priv: the bat priv with all the soft interface information | |
2550 | * @orig: the orig_node of the ogm | |
2551 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
2552 | * @tvlv_value: tvlv buffer containing the gateway data | |
2553 | * @tvlv_value_len: tvlv buffer length | |
2554 | */ | |
2555 | static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, | |
2556 | struct batadv_orig_node *orig, | |
2557 | uint8_t flags, | |
2558 | void *tvlv_value, | |
2559 | uint16_t tvlv_value_len) | |
2560 | { | |
2561 | struct batadv_tvlv_tt_data *tt_data; | |
2562 | uint16_t num_entries; | |
2563 | ||
2564 | if (tvlv_value_len < sizeof(*tt_data)) | |
2565 | return; | |
2566 | ||
2567 | tt_data = (struct batadv_tvlv_tt_data *)tvlv_value; | |
2568 | tvlv_value_len -= sizeof(*tt_data); | |
2569 | ||
2570 | num_entries = tvlv_value_len / batadv_tt_len(1); | |
2571 | ||
2572 | batadv_tt_update_orig(bat_priv, orig, | |
2573 | (unsigned char *)(tt_data + 1), | |
ced72933 | 2574 | num_entries, tt_data->ttvn, ntohl(tt_data->crc)); |
e1bf0c14 ML |
2575 | } |
2576 | ||
335fbe0f ML |
2577 | /** |
2578 | * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv | |
2579 | * container | |
2580 | * @bat_priv: the bat priv with all the soft interface information | |
2581 | * @src: mac address of tt tvlv sender | |
2582 | * @dst: mac address of tt tvlv recipient | |
2583 | * @tvlv_value: tvlv buffer containing the tt data | |
2584 | * @tvlv_value_len: tvlv buffer length | |
2585 | * | |
2586 | * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS | |
2587 | * otherwise. | |
2588 | */ | |
2589 | static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, | |
2590 | uint8_t *src, uint8_t *dst, | |
2591 | void *tvlv_value, | |
2592 | uint16_t tvlv_value_len) | |
2593 | { | |
2594 | struct batadv_tvlv_tt_data *tt_data; | |
2595 | uint16_t num_entries; | |
2596 | char tt_flag; | |
2597 | bool ret; | |
2598 | ||
2599 | if (tvlv_value_len < sizeof(*tt_data)) | |
2600 | return NET_RX_SUCCESS; | |
2601 | ||
2602 | tt_data = (struct batadv_tvlv_tt_data *)tvlv_value; | |
2603 | tvlv_value_len -= sizeof(*tt_data); | |
2604 | ||
2605 | num_entries = tvlv_value_len / batadv_tt_len(1); | |
2606 | ||
2607 | switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) { | |
2608 | case BATADV_TT_REQUEST: | |
2609 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX); | |
2610 | ||
2611 | /* If this node cannot provide a TT response the tt_request is | |
2612 | * forwarded | |
2613 | */ | |
2614 | ret = batadv_send_tt_response(bat_priv, tt_data, src, dst); | |
2615 | if (!ret) { | |
2616 | if (tt_data->flags & BATADV_TT_FULL_TABLE) | |
2617 | tt_flag = 'F'; | |
2618 | else | |
2619 | tt_flag = '.'; | |
2620 | ||
2621 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
2622 | "Routing TT_REQUEST to %pM [%c]\n", | |
2623 | dst, tt_flag); | |
2624 | /* tvlv API will re-route the packet */ | |
2625 | return NET_RX_DROP; | |
2626 | } | |
2627 | break; | |
2628 | case BATADV_TT_RESPONSE: | |
2629 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX); | |
2630 | ||
2631 | if (batadv_is_my_mac(bat_priv, dst)) { | |
2632 | batadv_handle_tt_response(bat_priv, tt_data, | |
2633 | src, num_entries); | |
2634 | return NET_RX_SUCCESS; | |
2635 | } | |
2636 | ||
2637 | if (tt_data->flags & BATADV_TT_FULL_TABLE) | |
2638 | tt_flag = 'F'; | |
2639 | else | |
2640 | tt_flag = '.'; | |
2641 | ||
2642 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
2643 | "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag); | |
2644 | ||
2645 | /* tvlv API will re-route the packet */ | |
2646 | return NET_RX_DROP; | |
2647 | } | |
2648 | ||
2649 | return NET_RX_SUCCESS; | |
2650 | } | |
2651 | ||
122edaa0 ML |
2652 | /** |
2653 | * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container | |
2654 | * @bat_priv: the bat priv with all the soft interface information | |
2655 | * @src: mac address of tt tvlv sender | |
2656 | * @dst: mac address of tt tvlv recipient | |
2657 | * @tvlv_value: tvlv buffer containing the tt data | |
2658 | * @tvlv_value_len: tvlv buffer length | |
2659 | * | |
2660 | * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS | |
2661 | * otherwise. | |
2662 | */ | |
2663 | static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, | |
2664 | uint8_t *src, uint8_t *dst, | |
2665 | void *tvlv_value, | |
2666 | uint16_t tvlv_value_len) | |
2667 | { | |
2668 | struct batadv_tvlv_roam_adv *roaming_adv; | |
2669 | struct batadv_orig_node *orig_node = NULL; | |
2670 | ||
2671 | /* If this node is not the intended recipient of the | |
2672 | * roaming advertisement the packet is forwarded | |
2673 | * (the tvlv API will re-route the packet). | |
2674 | */ | |
2675 | if (!batadv_is_my_mac(bat_priv, dst)) | |
2676 | return NET_RX_DROP; | |
2677 | ||
2678 | /* check if it is a backbone gateway. we don't accept | |
2679 | * roaming advertisement from it, as it has the same | |
2680 | * entries as we have. | |
2681 | */ | |
2682 | if (batadv_bla_is_backbone_gw_orig(bat_priv, src)) | |
2683 | goto out; | |
2684 | ||
2685 | if (tvlv_value_len < sizeof(*roaming_adv)) | |
2686 | goto out; | |
2687 | ||
2688 | orig_node = batadv_orig_hash_find(bat_priv, src); | |
2689 | if (!orig_node) | |
2690 | goto out; | |
2691 | ||
2692 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX); | |
2693 | roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value; | |
2694 | ||
2695 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
2696 | "Received ROAMING_ADV from %pM (client %pM)\n", | |
2697 | src, roaming_adv->client); | |
2698 | ||
2699 | batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client, | |
2700 | BATADV_TT_CLIENT_ROAM, | |
2701 | atomic_read(&orig_node->last_ttvn) + 1); | |
2702 | ||
2703 | out: | |
2704 | if (orig_node) | |
2705 | batadv_orig_node_free_ref(orig_node); | |
2706 | return NET_RX_SUCCESS; | |
2707 | } | |
2708 | ||
e1bf0c14 ML |
2709 | /** |
2710 | * batadv_tt_init - initialise the translation table internals | |
2711 | * @bat_priv: the bat priv with all the soft interface information | |
2712 | * | |
2713 | * Return 0 on success or negative error number in case of failure. | |
2714 | */ | |
2715 | int batadv_tt_init(struct batadv_priv *bat_priv) | |
2716 | { | |
2717 | int ret; | |
2718 | ||
2719 | ret = batadv_tt_local_init(bat_priv); | |
2720 | if (ret < 0) | |
2721 | return ret; | |
2722 | ||
2723 | ret = batadv_tt_global_init(bat_priv); | |
2724 | if (ret < 0) | |
2725 | return ret; | |
2726 | ||
2727 | batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1, | |
335fbe0f ML |
2728 | batadv_tt_tvlv_unicast_handler_v1, |
2729 | BATADV_TVLV_TT, 1, BATADV_NO_FLAGS); | |
e1bf0c14 | 2730 | |
122edaa0 ML |
2731 | batadv_tvlv_handler_register(bat_priv, NULL, |
2732 | batadv_roam_tvlv_unicast_handler_v1, | |
2733 | BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS); | |
2734 | ||
e1bf0c14 ML |
2735 | INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge); |
2736 | queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work, | |
2737 | msecs_to_jiffies(BATADV_TT_WORK_PERIOD)); | |
2738 | ||
2739 | return 1; | |
2740 | } |