Commit | Line | Data |
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9cfc7bd6 | 1 | /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 | 2 | * |
35c133a0 | 3 | * Marek Lindner, Simon Wunderlich, Antonio Quartulli |
c6c8fea2 SE |
4 | * |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
c6c8fea2 SE |
18 | */ |
19 | ||
20 | #include "main.h" | |
21 | #include "translation-table.h" | |
22 | #include "soft-interface.h" | |
32ae9b22 | 23 | #include "hard-interface.h" |
a73105b8 | 24 | #include "send.h" |
c6c8fea2 SE |
25 | #include "hash.h" |
26 | #include "originator.h" | |
a73105b8 | 27 | #include "routing.h" |
20ff9d59 | 28 | #include "bridge_loop_avoidance.h" |
c6c8fea2 | 29 | |
a73105b8 AQ |
30 | #include <linux/crc16.h> |
31 | ||
56303d34 SE |
32 | static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, |
33 | struct batadv_orig_node *orig_node); | |
a513088d SE |
34 | static void batadv_tt_purge(struct work_struct *work); |
35 | static void | |
56303d34 | 36 | batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry); |
c6c8fea2 | 37 | |
7aadf889 | 38 | /* returns 1 if they are the same mac addr */ |
a513088d | 39 | static int batadv_compare_tt(const struct hlist_node *node, const void *data2) |
7aadf889 | 40 | { |
56303d34 | 41 | const void *data1 = container_of(node, struct batadv_tt_common_entry, |
747e4221 | 42 | hash_entry); |
7aadf889 ML |
43 | |
44 | return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); | |
45 | } | |
46 | ||
56303d34 | 47 | static void batadv_tt_start_timer(struct batadv_priv *bat_priv) |
c6c8fea2 | 48 | { |
a513088d | 49 | INIT_DELAYED_WORK(&bat_priv->tt_work, batadv_tt_purge); |
3193e8fd | 50 | queue_delayed_work(batadv_event_workqueue, &bat_priv->tt_work, |
a73105b8 | 51 | msecs_to_jiffies(5000)); |
c6c8fea2 SE |
52 | } |
53 | ||
56303d34 | 54 | static struct batadv_tt_common_entry * |
5bf74e9c | 55 | batadv_tt_hash_find(struct batadv_hashtable *hash, const void *data) |
7aadf889 | 56 | { |
7aadf889 ML |
57 | struct hlist_head *head; |
58 | struct hlist_node *node; | |
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(); | |
48100bac | 70 | hlist_for_each_entry_rcu(tt_common_entry, node, 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 | |
a513088d | 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 | |
a513088d | 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 | 111 | |
7aadf889 ML |
112 | } |
113 | ||
a513088d | 114 | static void |
56303d34 | 115 | batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry) |
7683fdc1 | 116 | { |
48100bac AQ |
117 | if (atomic_dec_and_test(&tt_local_entry->common.refcount)) |
118 | kfree_rcu(tt_local_entry, common.rcu); | |
7683fdc1 AQ |
119 | } |
120 | ||
a513088d | 121 | static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu) |
531027fc | 122 | { |
56303d34 SE |
123 | struct batadv_tt_common_entry *tt_common_entry; |
124 | struct batadv_tt_global_entry *tt_global_entry; | |
531027fc | 125 | |
56303d34 SE |
126 | tt_common_entry = container_of(rcu, struct batadv_tt_common_entry, rcu); |
127 | tt_global_entry = container_of(tt_common_entry, | |
128 | struct batadv_tt_global_entry, common); | |
531027fc | 129 | |
531027fc SW |
130 | kfree(tt_global_entry); |
131 | } | |
132 | ||
a513088d | 133 | static void |
56303d34 | 134 | batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry) |
7683fdc1 | 135 | { |
db08e6e5 | 136 | if (atomic_dec_and_test(&tt_global_entry->common.refcount)) { |
a513088d | 137 | batadv_tt_global_del_orig_list(tt_global_entry); |
48100bac | 138 | call_rcu(&tt_global_entry->common.rcu, |
a513088d | 139 | batadv_tt_global_entry_free_rcu); |
db08e6e5 SW |
140 | } |
141 | } | |
142 | ||
a513088d | 143 | static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu) |
db08e6e5 | 144 | { |
56303d34 | 145 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 | 146 | |
56303d34 | 147 | orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu); |
7d211efc | 148 | batadv_orig_node_free_ref(orig_entry->orig_node); |
db08e6e5 SW |
149 | kfree(orig_entry); |
150 | } | |
151 | ||
a513088d | 152 | static void |
56303d34 | 153 | batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry) |
db08e6e5 | 154 | { |
29cb99de AQ |
155 | /* to avoid race conditions, immediately decrease the tt counter */ |
156 | atomic_dec(&orig_entry->orig_node->tt_size); | |
a513088d | 157 | call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu); |
7683fdc1 AQ |
158 | } |
159 | ||
56303d34 | 160 | static void batadv_tt_local_event(struct batadv_priv *bat_priv, |
a513088d | 161 | const uint8_t *addr, uint8_t flags) |
a73105b8 | 162 | { |
56303d34 | 163 | struct batadv_tt_change_node *tt_change_node, *entry, *safe; |
3b643de5 AQ |
164 | bool event_removed = false; |
165 | bool del_op_requested, del_op_entry; | |
a73105b8 AQ |
166 | |
167 | tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC); | |
168 | ||
169 | if (!tt_change_node) | |
170 | return; | |
171 | ||
ff66c975 | 172 | tt_change_node->change.flags = flags; |
a73105b8 AQ |
173 | memcpy(tt_change_node->change.addr, addr, ETH_ALEN); |
174 | ||
acd34afa | 175 | del_op_requested = flags & BATADV_TT_CLIENT_DEL; |
3b643de5 AQ |
176 | |
177 | /* check for ADD+DEL or DEL+ADD events */ | |
a73105b8 | 178 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
3b643de5 AQ |
179 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
180 | list) { | |
181 | if (!batadv_compare_eth(entry->change.addr, addr)) | |
182 | continue; | |
183 | ||
184 | /* DEL+ADD in the same orig interval have no effect and can be | |
185 | * removed to avoid silly behaviour on the receiver side. The | |
186 | * other way around (ADD+DEL) can happen in case of roaming of | |
187 | * a client still in the NEW state. Roaming of NEW clients is | |
188 | * now possible due to automatically recognition of "temporary" | |
189 | * clients | |
190 | */ | |
acd34afa | 191 | del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL; |
3b643de5 AQ |
192 | if (!del_op_requested && del_op_entry) |
193 | goto del; | |
194 | if (del_op_requested && !del_op_entry) | |
195 | goto del; | |
196 | continue; | |
197 | del: | |
198 | list_del(&entry->list); | |
199 | kfree(entry); | |
200 | event_removed = true; | |
201 | goto unlock; | |
202 | } | |
203 | ||
a73105b8 AQ |
204 | /* track the change in the OGMinterval list */ |
205 | list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list); | |
3b643de5 AQ |
206 | |
207 | unlock: | |
a73105b8 AQ |
208 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); |
209 | ||
3b643de5 AQ |
210 | if (event_removed) |
211 | atomic_dec(&bat_priv->tt_local_changes); | |
212 | else | |
213 | atomic_inc(&bat_priv->tt_local_changes); | |
a73105b8 AQ |
214 | } |
215 | ||
08c36d3e | 216 | int batadv_tt_len(int changes_num) |
a73105b8 | 217 | { |
96412690 | 218 | return changes_num * sizeof(struct batadv_tt_change); |
a73105b8 AQ |
219 | } |
220 | ||
56303d34 | 221 | static int batadv_tt_local_init(struct batadv_priv *bat_priv) |
c6c8fea2 | 222 | { |
2dafb49d | 223 | if (bat_priv->tt_local_hash) |
5346c35e | 224 | return 0; |
c6c8fea2 | 225 | |
1a8eaf07 | 226 | bat_priv->tt_local_hash = batadv_hash_new(1024); |
c6c8fea2 | 227 | |
2dafb49d | 228 | if (!bat_priv->tt_local_hash) |
5346c35e | 229 | return -ENOMEM; |
c6c8fea2 | 230 | |
5346c35e | 231 | return 0; |
c6c8fea2 SE |
232 | } |
233 | ||
08c36d3e SE |
234 | void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, |
235 | int ifindex) | |
c6c8fea2 | 236 | { |
56303d34 SE |
237 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
238 | struct batadv_tt_local_entry *tt_local_entry = NULL; | |
239 | struct batadv_tt_global_entry *tt_global_entry = NULL; | |
db08e6e5 SW |
240 | struct hlist_head *head; |
241 | struct hlist_node *node; | |
56303d34 | 242 | struct batadv_tt_orig_list_entry *orig_entry; |
80b3f58c | 243 | int hash_added; |
c6c8fea2 | 244 | |
a513088d | 245 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
c6c8fea2 | 246 | |
2dafb49d AQ |
247 | if (tt_local_entry) { |
248 | tt_local_entry->last_seen = jiffies; | |
acd34afa SE |
249 | /* possibly unset the BATADV_TT_CLIENT_PENDING flag */ |
250 | tt_local_entry->common.flags &= ~BATADV_TT_CLIENT_PENDING; | |
7683fdc1 | 251 | goto out; |
c6c8fea2 SE |
252 | } |
253 | ||
704509b8 | 254 | tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC); |
2dafb49d | 255 | if (!tt_local_entry) |
7683fdc1 | 256 | goto out; |
a73105b8 | 257 | |
39c75a51 | 258 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
259 | "Creating new local tt entry: %pM (ttvn: %d)\n", addr, |
260 | (uint8_t)atomic_read(&bat_priv->ttvn)); | |
c6c8fea2 | 261 | |
48100bac | 262 | memcpy(tt_local_entry->common.addr, addr, ETH_ALEN); |
42d0b044 | 263 | tt_local_entry->common.flags = BATADV_NO_FLAGS; |
9563877e | 264 | if (batadv_is_wifi_iface(ifindex)) |
acd34afa | 265 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_WIFI; |
48100bac AQ |
266 | atomic_set(&tt_local_entry->common.refcount, 2); |
267 | tt_local_entry->last_seen = jiffies; | |
c6c8fea2 SE |
268 | |
269 | /* the batman interface mac address should never be purged */ | |
1eda58bf | 270 | if (batadv_compare_eth(addr, soft_iface->dev_addr)) |
acd34afa | 271 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_NOPURGE; |
c6c8fea2 | 272 | |
c40ed2bf AQ |
273 | /* The local entry has to be marked as NEW to avoid to send it in |
274 | * a full table response going out before the next ttvn increment | |
9cfc7bd6 SE |
275 | * (consistency check) |
276 | */ | |
acd34afa | 277 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_NEW; |
c40ed2bf | 278 | |
a513088d | 279 | hash_added = batadv_hash_add(bat_priv->tt_local_hash, batadv_compare_tt, |
da641193 SE |
280 | batadv_choose_orig, |
281 | &tt_local_entry->common, | |
c0a55929 | 282 | &tt_local_entry->common.hash_entry); |
80b3f58c SW |
283 | |
284 | if (unlikely(hash_added != 0)) { | |
285 | /* remove the reference for the hash */ | |
a513088d | 286 | batadv_tt_local_entry_free_ref(tt_local_entry); |
80b3f58c SW |
287 | goto out; |
288 | } | |
289 | ||
a513088d | 290 | batadv_tt_local_event(bat_priv, addr, tt_local_entry->common.flags); |
ff66c975 | 291 | |
c6c8fea2 | 292 | /* remove address from global hash if present */ |
a513088d | 293 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
c6c8fea2 | 294 | |
cc47f66e AQ |
295 | /* Check whether it is a roaming! */ |
296 | if (tt_global_entry) { | |
db08e6e5 SW |
297 | /* These node are probably going to update their tt table */ |
298 | head = &tt_global_entry->orig_list; | |
299 | rcu_read_lock(); | |
300 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
301 | orig_entry->orig_node->tt_poss_change = true; | |
302 | ||
a513088d SE |
303 | batadv_send_roam_adv(bat_priv, |
304 | tt_global_entry->common.addr, | |
305 | orig_entry->orig_node); | |
db08e6e5 SW |
306 | } |
307 | rcu_read_unlock(); | |
308 | /* The global entry has to be marked as ROAMING and | |
309 | * has to be kept for consistency purpose | |
310 | */ | |
acd34afa | 311 | tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; |
03fc3070 | 312 | tt_global_entry->roam_at = jiffies; |
7683fdc1 AQ |
313 | } |
314 | out: | |
315 | if (tt_local_entry) | |
a513088d | 316 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7683fdc1 | 317 | if (tt_global_entry) |
a513088d | 318 | batadv_tt_global_entry_free_ref(tt_global_entry); |
c6c8fea2 SE |
319 | } |
320 | ||
a513088d SE |
321 | static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff, |
322 | int *packet_buff_len, | |
323 | int min_packet_len, | |
324 | int new_packet_len) | |
be9aa4c1 ML |
325 | { |
326 | unsigned char *new_buff; | |
327 | ||
328 | new_buff = kmalloc(new_packet_len, GFP_ATOMIC); | |
329 | ||
330 | /* keep old buffer if kmalloc should fail */ | |
331 | if (new_buff) { | |
332 | memcpy(new_buff, *packet_buff, min_packet_len); | |
333 | kfree(*packet_buff); | |
334 | *packet_buff = new_buff; | |
335 | *packet_buff_len = new_packet_len; | |
336 | } | |
337 | } | |
338 | ||
56303d34 | 339 | static void batadv_tt_prepare_packet_buff(struct batadv_priv *bat_priv, |
a513088d SE |
340 | unsigned char **packet_buff, |
341 | int *packet_buff_len, | |
342 | int min_packet_len) | |
be9aa4c1 | 343 | { |
56303d34 | 344 | struct batadv_hard_iface *primary_if; |
be9aa4c1 ML |
345 | int req_len; |
346 | ||
e5d89254 | 347 | primary_if = batadv_primary_if_get_selected(bat_priv); |
be9aa4c1 ML |
348 | |
349 | req_len = min_packet_len; | |
08c36d3e | 350 | req_len += batadv_tt_len(atomic_read(&bat_priv->tt_local_changes)); |
be9aa4c1 ML |
351 | |
352 | /* if we have too many changes for one packet don't send any | |
353 | * and wait for the tt table request which will be fragmented | |
354 | */ | |
355 | if ((!primary_if) || (req_len > primary_if->soft_iface->mtu)) | |
356 | req_len = min_packet_len; | |
357 | ||
a513088d SE |
358 | batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, |
359 | min_packet_len, req_len); | |
be9aa4c1 ML |
360 | |
361 | if (primary_if) | |
e5d89254 | 362 | batadv_hardif_free_ref(primary_if); |
be9aa4c1 ML |
363 | } |
364 | ||
56303d34 | 365 | static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv, |
a513088d SE |
366 | unsigned char **packet_buff, |
367 | int *packet_buff_len, | |
368 | int min_packet_len) | |
c6c8fea2 | 369 | { |
56303d34 | 370 | struct batadv_tt_change_node *entry, *safe; |
be9aa4c1 ML |
371 | int count = 0, tot_changes = 0, new_len; |
372 | unsigned char *tt_buff; | |
373 | ||
a513088d SE |
374 | batadv_tt_prepare_packet_buff(bat_priv, packet_buff, |
375 | packet_buff_len, min_packet_len); | |
c6c8fea2 | 376 | |
be9aa4c1 ML |
377 | new_len = *packet_buff_len - min_packet_len; |
378 | tt_buff = *packet_buff + min_packet_len; | |
379 | ||
380 | if (new_len > 0) | |
08c36d3e | 381 | tot_changes = new_len / batadv_tt_len(1); |
c6c8fea2 | 382 | |
a73105b8 AQ |
383 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
384 | atomic_set(&bat_priv->tt_local_changes, 0); | |
c6c8fea2 | 385 | |
a73105b8 | 386 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
7c64fd98 | 387 | list) { |
a73105b8 | 388 | if (count < tot_changes) { |
08c36d3e | 389 | memcpy(tt_buff + batadv_tt_len(count), |
96412690 | 390 | &entry->change, sizeof(struct batadv_tt_change)); |
c6c8fea2 SE |
391 | count++; |
392 | } | |
a73105b8 AQ |
393 | list_del(&entry->list); |
394 | kfree(entry); | |
c6c8fea2 | 395 | } |
a73105b8 AQ |
396 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); |
397 | ||
398 | /* Keep the buffer for possible tt_request */ | |
399 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
400 | kfree(bat_priv->tt_buff); | |
401 | bat_priv->tt_buff_len = 0; | |
402 | bat_priv->tt_buff = NULL; | |
be9aa4c1 ML |
403 | /* check whether this new OGM has no changes due to size problems */ |
404 | if (new_len > 0) { | |
405 | /* if kmalloc() fails we will reply with the full table | |
a73105b8 AQ |
406 | * instead of providing the diff |
407 | */ | |
be9aa4c1 | 408 | bat_priv->tt_buff = kmalloc(new_len, GFP_ATOMIC); |
a73105b8 | 409 | if (bat_priv->tt_buff) { |
be9aa4c1 ML |
410 | memcpy(bat_priv->tt_buff, tt_buff, new_len); |
411 | bat_priv->tt_buff_len = new_len; | |
a73105b8 AQ |
412 | } |
413 | } | |
414 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
c6c8fea2 | 415 | |
08ad76ec | 416 | return count; |
c6c8fea2 SE |
417 | } |
418 | ||
08c36d3e | 419 | int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
420 | { |
421 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 422 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
5bf74e9c | 423 | struct batadv_hashtable *hash = bat_priv->tt_local_hash; |
56303d34 SE |
424 | struct batadv_tt_common_entry *tt_common_entry; |
425 | struct batadv_hard_iface *primary_if; | |
7aadf889 | 426 | struct hlist_node *node; |
c6c8fea2 | 427 | struct hlist_head *head; |
c90681b8 AQ |
428 | uint32_t i; |
429 | int ret = 0; | |
32ae9b22 | 430 | |
e5d89254 | 431 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 432 | if (!primary_if) { |
86ceb360 SE |
433 | ret = seq_printf(seq, |
434 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
435 | net_dev->name); |
436 | goto out; | |
437 | } | |
c6c8fea2 | 438 | |
e9a4f295 | 439 | if (primary_if->if_status != BATADV_IF_ACTIVE) { |
86ceb360 SE |
440 | ret = seq_printf(seq, |
441 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
442 | net_dev->name); |
443 | goto out; | |
c6c8fea2 SE |
444 | } |
445 | ||
86ceb360 SE |
446 | seq_printf(seq, |
447 | "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n", | |
a73105b8 | 448 | net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn)); |
c6c8fea2 | 449 | |
c6c8fea2 SE |
450 | for (i = 0; i < hash->size; i++) { |
451 | head = &hash->table[i]; | |
452 | ||
7aadf889 | 453 | rcu_read_lock(); |
48100bac | 454 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 455 | head, hash_entry) { |
d099c2c5 | 456 | seq_printf(seq, " * %pM [%c%c%c%c%c]\n", |
7c64fd98 SE |
457 | tt_common_entry->addr, |
458 | (tt_common_entry->flags & | |
acd34afa | 459 | BATADV_TT_CLIENT_ROAM ? 'R' : '.'), |
7c64fd98 | 460 | (tt_common_entry->flags & |
acd34afa | 461 | BATADV_TT_CLIENT_NOPURGE ? 'P' : '.'), |
7c64fd98 | 462 | (tt_common_entry->flags & |
acd34afa | 463 | BATADV_TT_CLIENT_NEW ? 'N' : '.'), |
7c64fd98 | 464 | (tt_common_entry->flags & |
acd34afa | 465 | BATADV_TT_CLIENT_PENDING ? 'X' : '.'), |
7c64fd98 | 466 | (tt_common_entry->flags & |
acd34afa | 467 | BATADV_TT_CLIENT_WIFI ? 'W' : '.')); |
c6c8fea2 | 468 | } |
7aadf889 | 469 | rcu_read_unlock(); |
c6c8fea2 | 470 | } |
32ae9b22 ML |
471 | out: |
472 | if (primary_if) | |
e5d89254 | 473 | batadv_hardif_free_ref(primary_if); |
32ae9b22 | 474 | return ret; |
c6c8fea2 SE |
475 | } |
476 | ||
56303d34 SE |
477 | static void |
478 | batadv_tt_local_set_pending(struct batadv_priv *bat_priv, | |
479 | struct batadv_tt_local_entry *tt_local_entry, | |
480 | uint16_t flags, const char *message) | |
c6c8fea2 | 481 | { |
a513088d SE |
482 | batadv_tt_local_event(bat_priv, tt_local_entry->common.addr, |
483 | tt_local_entry->common.flags | flags); | |
a73105b8 | 484 | |
015758d0 AQ |
485 | /* The local client has to be marked as "pending to be removed" but has |
486 | * to be kept in the table in order to send it in a full table | |
9cfc7bd6 SE |
487 | * response issued before the net ttvn increment (consistency check) |
488 | */ | |
acd34afa | 489 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING; |
c566dbbe | 490 | |
39c75a51 | 491 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
492 | "Local tt entry (%pM) pending to be removed: %s\n", |
493 | tt_local_entry->common.addr, message); | |
c6c8fea2 SE |
494 | } |
495 | ||
56303d34 | 496 | void batadv_tt_local_remove(struct batadv_priv *bat_priv, const uint8_t *addr, |
08c36d3e | 497 | const char *message, bool roaming) |
c6c8fea2 | 498 | { |
56303d34 | 499 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
42d0b044 | 500 | uint16_t flags; |
c6c8fea2 | 501 | |
a513088d | 502 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
503 | if (!tt_local_entry) |
504 | goto out; | |
505 | ||
acd34afa | 506 | flags = BATADV_TT_CLIENT_DEL; |
42d0b044 | 507 | if (roaming) |
acd34afa | 508 | flags |= BATADV_TT_CLIENT_ROAM; |
42d0b044 SE |
509 | |
510 | batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags, message); | |
7683fdc1 AQ |
511 | out: |
512 | if (tt_local_entry) | |
a513088d | 513 | batadv_tt_local_entry_free_ref(tt_local_entry); |
c6c8fea2 SE |
514 | } |
515 | ||
56303d34 | 516 | static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, |
acd34afa | 517 | struct hlist_head *head) |
c6c8fea2 | 518 | { |
56303d34 SE |
519 | struct batadv_tt_local_entry *tt_local_entry; |
520 | struct batadv_tt_common_entry *tt_common_entry; | |
7aadf889 | 521 | struct hlist_node *node, *node_tmp; |
acd34afa SE |
522 | |
523 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, head, | |
524 | hash_entry) { | |
525 | tt_local_entry = container_of(tt_common_entry, | |
56303d34 SE |
526 | struct batadv_tt_local_entry, |
527 | common); | |
acd34afa SE |
528 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE) |
529 | continue; | |
530 | ||
531 | /* entry already marked for deletion */ | |
532 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) | |
533 | continue; | |
534 | ||
535 | if (!batadv_has_timed_out(tt_local_entry->last_seen, | |
536 | BATADV_TT_LOCAL_TIMEOUT)) | |
537 | continue; | |
538 | ||
539 | batadv_tt_local_set_pending(bat_priv, tt_local_entry, | |
540 | BATADV_TT_CLIENT_DEL, "timed out"); | |
541 | } | |
542 | } | |
543 | ||
56303d34 | 544 | static void batadv_tt_local_purge(struct batadv_priv *bat_priv) |
acd34afa | 545 | { |
5bf74e9c | 546 | struct batadv_hashtable *hash = bat_priv->tt_local_hash; |
c6c8fea2 | 547 | struct hlist_head *head; |
7683fdc1 | 548 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 549 | uint32_t i; |
c6c8fea2 | 550 | |
c6c8fea2 SE |
551 | for (i = 0; i < hash->size; i++) { |
552 | head = &hash->table[i]; | |
7683fdc1 | 553 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 554 | |
7683fdc1 | 555 | spin_lock_bh(list_lock); |
acd34afa | 556 | batadv_tt_local_purge_list(bat_priv, head); |
7683fdc1 | 557 | spin_unlock_bh(list_lock); |
c6c8fea2 SE |
558 | } |
559 | ||
c6c8fea2 SE |
560 | } |
561 | ||
56303d34 | 562 | static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 563 | { |
5bf74e9c | 564 | struct batadv_hashtable *hash; |
a73105b8 | 565 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
56303d34 SE |
566 | struct batadv_tt_common_entry *tt_common_entry; |
567 | struct batadv_tt_local_entry *tt_local; | |
7683fdc1 AQ |
568 | struct hlist_node *node, *node_tmp; |
569 | struct hlist_head *head; | |
c90681b8 | 570 | uint32_t i; |
a73105b8 | 571 | |
2dafb49d | 572 | if (!bat_priv->tt_local_hash) |
c6c8fea2 SE |
573 | return; |
574 | ||
a73105b8 AQ |
575 | hash = bat_priv->tt_local_hash; |
576 | ||
577 | for (i = 0; i < hash->size; i++) { | |
578 | head = &hash->table[i]; | |
579 | list_lock = &hash->list_locks[i]; | |
580 | ||
581 | spin_lock_bh(list_lock); | |
48100bac | 582 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
a73105b8 AQ |
583 | head, hash_entry) { |
584 | hlist_del_rcu(node); | |
56303d34 SE |
585 | tt_local = container_of(tt_common_entry, |
586 | struct batadv_tt_local_entry, | |
587 | common); | |
588 | batadv_tt_local_entry_free_ref(tt_local); | |
a73105b8 AQ |
589 | } |
590 | spin_unlock_bh(list_lock); | |
591 | } | |
592 | ||
1a8eaf07 | 593 | batadv_hash_destroy(hash); |
a73105b8 | 594 | |
2dafb49d | 595 | bat_priv->tt_local_hash = NULL; |
c6c8fea2 SE |
596 | } |
597 | ||
56303d34 | 598 | static int batadv_tt_global_init(struct batadv_priv *bat_priv) |
c6c8fea2 | 599 | { |
2dafb49d | 600 | if (bat_priv->tt_global_hash) |
5346c35e | 601 | return 0; |
c6c8fea2 | 602 | |
1a8eaf07 | 603 | bat_priv->tt_global_hash = batadv_hash_new(1024); |
c6c8fea2 | 604 | |
2dafb49d | 605 | if (!bat_priv->tt_global_hash) |
5346c35e | 606 | return -ENOMEM; |
c6c8fea2 | 607 | |
5346c35e | 608 | return 0; |
c6c8fea2 SE |
609 | } |
610 | ||
56303d34 | 611 | static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 612 | { |
56303d34 | 613 | struct batadv_tt_change_node *entry, *safe; |
c6c8fea2 | 614 | |
a73105b8 | 615 | spin_lock_bh(&bat_priv->tt_changes_list_lock); |
c6c8fea2 | 616 | |
a73105b8 AQ |
617 | list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list, |
618 | list) { | |
619 | list_del(&entry->list); | |
620 | kfree(entry); | |
621 | } | |
c6c8fea2 | 622 | |
a73105b8 AQ |
623 | atomic_set(&bat_priv->tt_local_changes, 0); |
624 | spin_unlock_bh(&bat_priv->tt_changes_list_lock); | |
625 | } | |
c6c8fea2 | 626 | |
db08e6e5 SW |
627 | /* find out if an orig_node is already in the list of a tt_global_entry. |
628 | * returns 1 if found, 0 otherwise | |
629 | */ | |
56303d34 SE |
630 | static bool |
631 | batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry, | |
632 | const struct batadv_orig_node *orig_node) | |
db08e6e5 | 633 | { |
56303d34 | 634 | struct batadv_tt_orig_list_entry *tmp_orig_entry; |
db08e6e5 SW |
635 | const struct hlist_head *head; |
636 | struct hlist_node *node; | |
637 | bool found = false; | |
638 | ||
639 | rcu_read_lock(); | |
640 | head = &entry->orig_list; | |
641 | hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) { | |
642 | if (tmp_orig_entry->orig_node == orig_node) { | |
643 | found = true; | |
644 | break; | |
645 | } | |
646 | } | |
647 | rcu_read_unlock(); | |
648 | return found; | |
649 | } | |
650 | ||
a513088d | 651 | static void |
56303d34 SE |
652 | batadv_tt_global_add_orig_entry(struct batadv_tt_global_entry *tt_global_entry, |
653 | struct batadv_orig_node *orig_node, int ttvn) | |
db08e6e5 | 654 | { |
56303d34 | 655 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 SW |
656 | |
657 | orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC); | |
658 | if (!orig_entry) | |
659 | return; | |
660 | ||
661 | INIT_HLIST_NODE(&orig_entry->list); | |
662 | atomic_inc(&orig_node->refcount); | |
663 | atomic_inc(&orig_node->tt_size); | |
664 | orig_entry->orig_node = orig_node; | |
665 | orig_entry->ttvn = ttvn; | |
666 | ||
667 | spin_lock_bh(&tt_global_entry->list_lock); | |
668 | hlist_add_head_rcu(&orig_entry->list, | |
669 | &tt_global_entry->orig_list); | |
670 | spin_unlock_bh(&tt_global_entry->list_lock); | |
671 | } | |
672 | ||
a73105b8 | 673 | /* caller must hold orig_node refcount */ |
56303d34 SE |
674 | int batadv_tt_global_add(struct batadv_priv *bat_priv, |
675 | struct batadv_orig_node *orig_node, | |
d4f44692 AQ |
676 | const unsigned char *tt_addr, uint8_t flags, |
677 | uint8_t ttvn) | |
a73105b8 | 678 | { |
56303d34 | 679 | struct batadv_tt_global_entry *tt_global_entry = NULL; |
7683fdc1 | 680 | int ret = 0; |
80b3f58c | 681 | int hash_added; |
56303d34 | 682 | struct batadv_tt_common_entry *common; |
c6c8fea2 | 683 | |
a513088d | 684 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr); |
a73105b8 AQ |
685 | |
686 | if (!tt_global_entry) { | |
d4f44692 | 687 | tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC); |
a73105b8 | 688 | if (!tt_global_entry) |
7683fdc1 AQ |
689 | goto out; |
690 | ||
c0a55929 SE |
691 | common = &tt_global_entry->common; |
692 | memcpy(common->addr, tt_addr, ETH_ALEN); | |
db08e6e5 | 693 | |
d4f44692 | 694 | common->flags = flags; |
cc47f66e | 695 | tt_global_entry->roam_at = 0; |
c0a55929 | 696 | atomic_set(&common->refcount, 2); |
db08e6e5 SW |
697 | |
698 | INIT_HLIST_HEAD(&tt_global_entry->orig_list); | |
699 | spin_lock_init(&tt_global_entry->list_lock); | |
7683fdc1 | 700 | |
c0a55929 | 701 | hash_added = batadv_hash_add(bat_priv->tt_global_hash, |
a513088d SE |
702 | batadv_compare_tt, |
703 | batadv_choose_orig, common, | |
704 | &common->hash_entry); | |
80b3f58c SW |
705 | |
706 | if (unlikely(hash_added != 0)) { | |
707 | /* remove the reference for the hash */ | |
a513088d | 708 | batadv_tt_global_entry_free_ref(tt_global_entry); |
80b3f58c SW |
709 | goto out_remove; |
710 | } | |
db08e6e5 | 711 | |
a513088d SE |
712 | batadv_tt_global_add_orig_entry(tt_global_entry, orig_node, |
713 | ttvn); | |
a73105b8 | 714 | } else { |
db08e6e5 SW |
715 | /* there is already a global entry, use this one. */ |
716 | ||
acd34afa SE |
717 | /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only |
718 | * one originator left in the list and we previously received a | |
db08e6e5 SW |
719 | * delete + roaming change for this originator. |
720 | * | |
721 | * We should first delete the old originator before adding the | |
722 | * new one. | |
723 | */ | |
acd34afa | 724 | if (tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM) { |
a513088d | 725 | batadv_tt_global_del_orig_list(tt_global_entry); |
acd34afa | 726 | tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM; |
db08e6e5 | 727 | tt_global_entry->roam_at = 0; |
a73105b8 | 728 | } |
db08e6e5 | 729 | |
a513088d SE |
730 | if (!batadv_tt_global_entry_has_orig(tt_global_entry, |
731 | orig_node)) | |
732 | batadv_tt_global_add_orig_entry(tt_global_entry, | |
733 | orig_node, ttvn); | |
a73105b8 | 734 | } |
c6c8fea2 | 735 | |
39c75a51 | 736 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
737 | "Creating new global tt entry: %pM (via %pM)\n", |
738 | tt_global_entry->common.addr, orig_node->orig); | |
c6c8fea2 | 739 | |
80b3f58c | 740 | out_remove: |
a73105b8 | 741 | /* remove address from local hash if present */ |
08c36d3e | 742 | batadv_tt_local_remove(bat_priv, tt_global_entry->common.addr, |
acd34afa SE |
743 | "global tt received", |
744 | flags & BATADV_TT_CLIENT_ROAM); | |
7683fdc1 AQ |
745 | ret = 1; |
746 | out: | |
747 | if (tt_global_entry) | |
a513088d | 748 | batadv_tt_global_entry_free_ref(tt_global_entry); |
7683fdc1 | 749 | return ret; |
c6c8fea2 SE |
750 | } |
751 | ||
db08e6e5 SW |
752 | /* print all orig nodes who announce the address for this global entry. |
753 | * it is assumed that the caller holds rcu_read_lock(); | |
754 | */ | |
a513088d | 755 | static void |
56303d34 | 756 | batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry, |
a513088d | 757 | struct seq_file *seq) |
db08e6e5 SW |
758 | { |
759 | struct hlist_head *head; | |
760 | struct hlist_node *node; | |
56303d34 SE |
761 | struct batadv_tt_orig_list_entry *orig_entry; |
762 | struct batadv_tt_common_entry *tt_common_entry; | |
db08e6e5 SW |
763 | uint16_t flags; |
764 | uint8_t last_ttvn; | |
765 | ||
766 | tt_common_entry = &tt_global_entry->common; | |
767 | ||
768 | head = &tt_global_entry->orig_list; | |
769 | ||
770 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
771 | flags = tt_common_entry->flags; | |
772 | last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn); | |
773 | seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c]\n", | |
774 | tt_global_entry->common.addr, orig_entry->ttvn, | |
775 | orig_entry->orig_node->orig, last_ttvn, | |
acd34afa SE |
776 | (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), |
777 | (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.')); | |
db08e6e5 SW |
778 | } |
779 | } | |
780 | ||
08c36d3e | 781 | int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
782 | { |
783 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 784 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
5bf74e9c | 785 | struct batadv_hashtable *hash = bat_priv->tt_global_hash; |
56303d34 SE |
786 | struct batadv_tt_common_entry *tt_common_entry; |
787 | struct batadv_tt_global_entry *tt_global; | |
788 | struct batadv_hard_iface *primary_if; | |
7aadf889 | 789 | struct hlist_node *node; |
c6c8fea2 | 790 | struct hlist_head *head; |
c90681b8 AQ |
791 | uint32_t i; |
792 | int ret = 0; | |
32ae9b22 | 793 | |
e5d89254 | 794 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 795 | if (!primary_if) { |
86ceb360 SE |
796 | ret = seq_printf(seq, |
797 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
798 | net_dev->name); |
799 | goto out; | |
800 | } | |
c6c8fea2 | 801 | |
e9a4f295 | 802 | if (primary_if->if_status != BATADV_IF_ACTIVE) { |
86ceb360 SE |
803 | ret = seq_printf(seq, |
804 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
805 | net_dev->name); |
806 | goto out; | |
c6c8fea2 SE |
807 | } |
808 | ||
2dafb49d AQ |
809 | seq_printf(seq, |
810 | "Globally announced TT entries received via the mesh %s\n", | |
c6c8fea2 | 811 | net_dev->name); |
df6edb9e AQ |
812 | seq_printf(seq, " %-13s %s %-15s %s %s\n", |
813 | "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags"); | |
c6c8fea2 | 814 | |
c6c8fea2 SE |
815 | for (i = 0; i < hash->size; i++) { |
816 | head = &hash->table[i]; | |
817 | ||
7aadf889 | 818 | rcu_read_lock(); |
48100bac | 819 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 820 | head, hash_entry) { |
56303d34 SE |
821 | tt_global = container_of(tt_common_entry, |
822 | struct batadv_tt_global_entry, | |
823 | common); | |
824 | batadv_tt_global_print_entry(tt_global, seq); | |
c6c8fea2 | 825 | } |
7aadf889 | 826 | rcu_read_unlock(); |
c6c8fea2 | 827 | } |
32ae9b22 ML |
828 | out: |
829 | if (primary_if) | |
e5d89254 | 830 | batadv_hardif_free_ref(primary_if); |
32ae9b22 | 831 | return ret; |
c6c8fea2 SE |
832 | } |
833 | ||
db08e6e5 | 834 | /* deletes the orig list of a tt_global_entry */ |
a513088d | 835 | static void |
56303d34 | 836 | batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry) |
c6c8fea2 | 837 | { |
db08e6e5 SW |
838 | struct hlist_head *head; |
839 | struct hlist_node *node, *safe; | |
56303d34 | 840 | struct batadv_tt_orig_list_entry *orig_entry; |
a73105b8 | 841 | |
db08e6e5 SW |
842 | spin_lock_bh(&tt_global_entry->list_lock); |
843 | head = &tt_global_entry->orig_list; | |
844 | hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { | |
845 | hlist_del_rcu(node); | |
a513088d | 846 | batadv_tt_orig_list_entry_free_ref(orig_entry); |
db08e6e5 SW |
847 | } |
848 | spin_unlock_bh(&tt_global_entry->list_lock); | |
c6c8fea2 | 849 | |
db08e6e5 SW |
850 | } |
851 | ||
a513088d | 852 | static void |
56303d34 SE |
853 | batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv, |
854 | struct batadv_tt_global_entry *tt_global_entry, | |
855 | struct batadv_orig_node *orig_node, | |
a513088d | 856 | const char *message) |
db08e6e5 SW |
857 | { |
858 | struct hlist_head *head; | |
859 | struct hlist_node *node, *safe; | |
56303d34 | 860 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 SW |
861 | |
862 | spin_lock_bh(&tt_global_entry->list_lock); | |
863 | head = &tt_global_entry->orig_list; | |
864 | hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { | |
865 | if (orig_entry->orig_node == orig_node) { | |
39c75a51 | 866 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
867 | "Deleting %pM from global tt entry %pM: %s\n", |
868 | orig_node->orig, | |
869 | tt_global_entry->common.addr, message); | |
db08e6e5 | 870 | hlist_del_rcu(node); |
a513088d | 871 | batadv_tt_orig_list_entry_free_ref(orig_entry); |
db08e6e5 SW |
872 | } |
873 | } | |
874 | spin_unlock_bh(&tt_global_entry->list_lock); | |
875 | } | |
876 | ||
56303d34 SE |
877 | static void |
878 | batadv_tt_global_del_struct(struct batadv_priv *bat_priv, | |
879 | struct batadv_tt_global_entry *tt_global_entry, | |
880 | const char *message) | |
db08e6e5 | 881 | { |
39c75a51 SE |
882 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
883 | "Deleting global tt entry %pM: %s\n", | |
1eda58bf | 884 | tt_global_entry->common.addr, message); |
7683fdc1 | 885 | |
a513088d | 886 | batadv_hash_remove(bat_priv->tt_global_hash, batadv_compare_tt, |
da641193 | 887 | batadv_choose_orig, tt_global_entry->common.addr); |
a513088d | 888 | batadv_tt_global_entry_free_ref(tt_global_entry); |
db08e6e5 | 889 | |
c6c8fea2 SE |
890 | } |
891 | ||
db08e6e5 | 892 | /* If the client is to be deleted, we check if it is the last origantor entry |
acd34afa SE |
893 | * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the |
894 | * timer, otherwise we simply remove the originator scheduled for deletion. | |
db08e6e5 | 895 | */ |
a513088d | 896 | static void |
56303d34 SE |
897 | batadv_tt_global_del_roaming(struct batadv_priv *bat_priv, |
898 | struct batadv_tt_global_entry *tt_global_entry, | |
899 | struct batadv_orig_node *orig_node, | |
900 | const char *message) | |
db08e6e5 SW |
901 | { |
902 | bool last_entry = true; | |
903 | struct hlist_head *head; | |
904 | struct hlist_node *node; | |
56303d34 | 905 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 SW |
906 | |
907 | /* no local entry exists, case 1: | |
908 | * Check if this is the last one or if other entries exist. | |
909 | */ | |
910 | ||
911 | rcu_read_lock(); | |
912 | head = &tt_global_entry->orig_list; | |
913 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
914 | if (orig_entry->orig_node != orig_node) { | |
915 | last_entry = false; | |
916 | break; | |
917 | } | |
918 | } | |
919 | rcu_read_unlock(); | |
920 | ||
921 | if (last_entry) { | |
922 | /* its the last one, mark for roaming. */ | |
acd34afa | 923 | tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; |
db08e6e5 SW |
924 | tt_global_entry->roam_at = jiffies; |
925 | } else | |
926 | /* there is another entry, we can simply delete this | |
927 | * one and can still use the other one. | |
928 | */ | |
a513088d SE |
929 | batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, |
930 | orig_node, message); | |
db08e6e5 SW |
931 | } |
932 | ||
933 | ||
934 | ||
56303d34 SE |
935 | static void batadv_tt_global_del(struct batadv_priv *bat_priv, |
936 | struct batadv_orig_node *orig_node, | |
a513088d SE |
937 | const unsigned char *addr, |
938 | const char *message, bool roaming) | |
a73105b8 | 939 | { |
56303d34 SE |
940 | struct batadv_tt_global_entry *tt_global_entry = NULL; |
941 | struct batadv_tt_local_entry *local_entry = NULL; | |
a73105b8 | 942 | |
a513088d | 943 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
db08e6e5 | 944 | if (!tt_global_entry) |
7683fdc1 | 945 | goto out; |
a73105b8 | 946 | |
db08e6e5 | 947 | if (!roaming) { |
a513088d SE |
948 | batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, |
949 | orig_node, message); | |
db08e6e5 SW |
950 | |
951 | if (hlist_empty(&tt_global_entry->orig_list)) | |
a513088d SE |
952 | batadv_tt_global_del_struct(bat_priv, tt_global_entry, |
953 | message); | |
db08e6e5 SW |
954 | |
955 | goto out; | |
956 | } | |
92f90f56 SE |
957 | |
958 | /* if we are deleting a global entry due to a roam | |
959 | * event, there are two possibilities: | |
db08e6e5 SW |
960 | * 1) the client roamed from node A to node B => if there |
961 | * is only one originator left for this client, we mark | |
acd34afa | 962 | * it with BATADV_TT_CLIENT_ROAM, we start a timer and we |
92f90f56 SE |
963 | * wait for node B to claim it. In case of timeout |
964 | * the entry is purged. | |
db08e6e5 SW |
965 | * |
966 | * If there are other originators left, we directly delete | |
967 | * the originator. | |
92f90f56 | 968 | * 2) the client roamed to us => we can directly delete |
9cfc7bd6 SE |
969 | * the global entry, since it is useless now. |
970 | */ | |
a513088d SE |
971 | local_entry = batadv_tt_local_hash_find(bat_priv, |
972 | tt_global_entry->common.addr); | |
973 | if (local_entry) { | |
db08e6e5 | 974 | /* local entry exists, case 2: client roamed to us. */ |
a513088d SE |
975 | batadv_tt_global_del_orig_list(tt_global_entry); |
976 | batadv_tt_global_del_struct(bat_priv, tt_global_entry, message); | |
db08e6e5 SW |
977 | } else |
978 | /* no local entry exists, case 1: check for roaming */ | |
a513088d SE |
979 | batadv_tt_global_del_roaming(bat_priv, tt_global_entry, |
980 | orig_node, message); | |
92f90f56 | 981 | |
92f90f56 | 982 | |
cc47f66e | 983 | out: |
7683fdc1 | 984 | if (tt_global_entry) |
a513088d SE |
985 | batadv_tt_global_entry_free_ref(tt_global_entry); |
986 | if (local_entry) | |
987 | batadv_tt_local_entry_free_ref(local_entry); | |
a73105b8 AQ |
988 | } |
989 | ||
56303d34 SE |
990 | void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, |
991 | struct batadv_orig_node *orig_node, | |
992 | const char *message) | |
c6c8fea2 | 993 | { |
56303d34 SE |
994 | struct batadv_tt_global_entry *tt_global; |
995 | struct batadv_tt_common_entry *tt_common_entry; | |
c90681b8 | 996 | uint32_t i; |
5bf74e9c | 997 | struct batadv_hashtable *hash = bat_priv->tt_global_hash; |
a73105b8 AQ |
998 | struct hlist_node *node, *safe; |
999 | struct hlist_head *head; | |
7683fdc1 | 1000 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c6c8fea2 | 1001 | |
6e801494 SW |
1002 | if (!hash) |
1003 | return; | |
1004 | ||
a73105b8 AQ |
1005 | for (i = 0; i < hash->size; i++) { |
1006 | head = &hash->table[i]; | |
7683fdc1 | 1007 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 1008 | |
7683fdc1 | 1009 | spin_lock_bh(list_lock); |
48100bac | 1010 | hlist_for_each_entry_safe(tt_common_entry, node, safe, |
7c64fd98 | 1011 | head, hash_entry) { |
56303d34 SE |
1012 | tt_global = container_of(tt_common_entry, |
1013 | struct batadv_tt_global_entry, | |
1014 | common); | |
db08e6e5 | 1015 | |
56303d34 | 1016 | batadv_tt_global_del_orig_entry(bat_priv, tt_global, |
a513088d | 1017 | orig_node, message); |
db08e6e5 | 1018 | |
56303d34 | 1019 | if (hlist_empty(&tt_global->orig_list)) { |
39c75a51 | 1020 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 1021 | "Deleting global tt entry %pM: %s\n", |
56303d34 | 1022 | tt_global->common.addr, message); |
7683fdc1 | 1023 | hlist_del_rcu(node); |
56303d34 | 1024 | batadv_tt_global_entry_free_ref(tt_global); |
7683fdc1 | 1025 | } |
a73105b8 | 1026 | } |
7683fdc1 | 1027 | spin_unlock_bh(list_lock); |
c6c8fea2 | 1028 | } |
17071578 | 1029 | orig_node->tt_initialised = false; |
c6c8fea2 SE |
1030 | } |
1031 | ||
56303d34 | 1032 | static void batadv_tt_global_roam_purge_list(struct batadv_priv *bat_priv, |
42d0b044 | 1033 | struct hlist_head *head) |
cc47f66e | 1034 | { |
56303d34 SE |
1035 | struct batadv_tt_common_entry *tt_common_entry; |
1036 | struct batadv_tt_global_entry *tt_global_entry; | |
cc47f66e | 1037 | struct hlist_node *node, *node_tmp; |
42d0b044 SE |
1038 | |
1039 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, head, | |
1040 | hash_entry) { | |
1041 | tt_global_entry = container_of(tt_common_entry, | |
56303d34 SE |
1042 | struct batadv_tt_global_entry, |
1043 | common); | |
acd34afa | 1044 | if (!(tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM)) |
42d0b044 SE |
1045 | continue; |
1046 | if (!batadv_has_timed_out(tt_global_entry->roam_at, | |
1047 | BATADV_TT_CLIENT_ROAM_TIMEOUT)) | |
1048 | continue; | |
1049 | ||
39c75a51 | 1050 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
42d0b044 SE |
1051 | "Deleting global tt entry (%pM): Roaming timeout\n", |
1052 | tt_global_entry->common.addr); | |
1053 | ||
1054 | hlist_del_rcu(node); | |
1055 | batadv_tt_global_entry_free_ref(tt_global_entry); | |
1056 | } | |
1057 | } | |
1058 | ||
56303d34 | 1059 | static void batadv_tt_global_roam_purge(struct batadv_priv *bat_priv) |
42d0b044 | 1060 | { |
5bf74e9c | 1061 | struct batadv_hashtable *hash = bat_priv->tt_global_hash; |
cc47f66e | 1062 | struct hlist_head *head; |
7683fdc1 | 1063 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 1064 | uint32_t i; |
cc47f66e | 1065 | |
cc47f66e AQ |
1066 | for (i = 0; i < hash->size; i++) { |
1067 | head = &hash->table[i]; | |
7683fdc1 | 1068 | list_lock = &hash->list_locks[i]; |
cc47f66e | 1069 | |
7683fdc1 | 1070 | spin_lock_bh(list_lock); |
42d0b044 | 1071 | batadv_tt_global_roam_purge_list(bat_priv, head); |
7683fdc1 | 1072 | spin_unlock_bh(list_lock); |
cc47f66e AQ |
1073 | } |
1074 | ||
cc47f66e AQ |
1075 | } |
1076 | ||
56303d34 | 1077 | static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 1078 | { |
5bf74e9c | 1079 | struct batadv_hashtable *hash; |
7683fdc1 | 1080 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
56303d34 SE |
1081 | struct batadv_tt_common_entry *tt_common_entry; |
1082 | struct batadv_tt_global_entry *tt_global; | |
7683fdc1 AQ |
1083 | struct hlist_node *node, *node_tmp; |
1084 | struct hlist_head *head; | |
c90681b8 | 1085 | uint32_t i; |
7683fdc1 | 1086 | |
2dafb49d | 1087 | if (!bat_priv->tt_global_hash) |
c6c8fea2 SE |
1088 | return; |
1089 | ||
7683fdc1 AQ |
1090 | hash = bat_priv->tt_global_hash; |
1091 | ||
1092 | for (i = 0; i < hash->size; i++) { | |
1093 | head = &hash->table[i]; | |
1094 | list_lock = &hash->list_locks[i]; | |
1095 | ||
1096 | spin_lock_bh(list_lock); | |
48100bac | 1097 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
7683fdc1 AQ |
1098 | head, hash_entry) { |
1099 | hlist_del_rcu(node); | |
56303d34 SE |
1100 | tt_global = container_of(tt_common_entry, |
1101 | struct batadv_tt_global_entry, | |
1102 | common); | |
1103 | batadv_tt_global_entry_free_ref(tt_global); | |
7683fdc1 AQ |
1104 | } |
1105 | spin_unlock_bh(list_lock); | |
1106 | } | |
1107 | ||
1a8eaf07 | 1108 | batadv_hash_destroy(hash); |
7683fdc1 | 1109 | |
2dafb49d | 1110 | bat_priv->tt_global_hash = NULL; |
c6c8fea2 SE |
1111 | } |
1112 | ||
56303d34 SE |
1113 | static bool |
1114 | _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry, | |
1115 | struct batadv_tt_global_entry *tt_global_entry) | |
59b699cd AQ |
1116 | { |
1117 | bool ret = false; | |
1118 | ||
acd34afa SE |
1119 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI && |
1120 | tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI) | |
59b699cd AQ |
1121 | ret = true; |
1122 | ||
1123 | return ret; | |
1124 | } | |
1125 | ||
56303d34 SE |
1126 | struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, |
1127 | const uint8_t *src, | |
1128 | const uint8_t *addr) | |
c6c8fea2 | 1129 | { |
56303d34 SE |
1130 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
1131 | struct batadv_tt_global_entry *tt_global_entry = NULL; | |
1132 | struct batadv_orig_node *orig_node = NULL; | |
1133 | struct batadv_neigh_node *router = NULL; | |
db08e6e5 SW |
1134 | struct hlist_head *head; |
1135 | struct hlist_node *node; | |
56303d34 | 1136 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 | 1137 | int best_tq; |
c6c8fea2 | 1138 | |
3d393e47 | 1139 | if (src && atomic_read(&bat_priv->ap_isolation)) { |
a513088d | 1140 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, src); |
3d393e47 AQ |
1141 | if (!tt_local_entry) |
1142 | goto out; | |
1143 | } | |
7aadf889 | 1144 | |
a513088d | 1145 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
2dafb49d | 1146 | if (!tt_global_entry) |
7b36e8ee | 1147 | goto out; |
7aadf889 | 1148 | |
3d393e47 | 1149 | /* check whether the clients should not communicate due to AP |
9cfc7bd6 SE |
1150 | * isolation |
1151 | */ | |
a513088d SE |
1152 | if (tt_local_entry && |
1153 | _batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) | |
3d393e47 AQ |
1154 | goto out; |
1155 | ||
db08e6e5 | 1156 | best_tq = 0; |
c6c8fea2 | 1157 | |
db08e6e5 SW |
1158 | rcu_read_lock(); |
1159 | head = &tt_global_entry->orig_list; | |
1160 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
7d211efc | 1161 | router = batadv_orig_node_get_router(orig_entry->orig_node); |
db08e6e5 SW |
1162 | if (!router) |
1163 | continue; | |
c6c8fea2 | 1164 | |
db08e6e5 SW |
1165 | if (router->tq_avg > best_tq) { |
1166 | orig_node = orig_entry->orig_node; | |
1167 | best_tq = router->tq_avg; | |
1168 | } | |
7d211efc | 1169 | batadv_neigh_node_free_ref(router); |
db08e6e5 SW |
1170 | } |
1171 | /* found anything? */ | |
1172 | if (orig_node && !atomic_inc_not_zero(&orig_node->refcount)) | |
1173 | orig_node = NULL; | |
1174 | rcu_read_unlock(); | |
7b36e8ee | 1175 | out: |
3d393e47 | 1176 | if (tt_global_entry) |
a513088d | 1177 | batadv_tt_global_entry_free_ref(tt_global_entry); |
3d393e47 | 1178 | if (tt_local_entry) |
a513088d | 1179 | batadv_tt_local_entry_free_ref(tt_local_entry); |
3d393e47 | 1180 | |
7b36e8ee | 1181 | return orig_node; |
c6c8fea2 | 1182 | } |
a73105b8 AQ |
1183 | |
1184 | /* Calculates the checksum of the local table of a given orig_node */ | |
56303d34 SE |
1185 | static uint16_t batadv_tt_global_crc(struct batadv_priv *bat_priv, |
1186 | struct batadv_orig_node *orig_node) | |
a73105b8 AQ |
1187 | { |
1188 | uint16_t total = 0, total_one; | |
5bf74e9c | 1189 | struct batadv_hashtable *hash = bat_priv->tt_global_hash; |
56303d34 SE |
1190 | struct batadv_tt_common_entry *tt_common; |
1191 | struct batadv_tt_global_entry *tt_global; | |
a73105b8 AQ |
1192 | struct hlist_node *node; |
1193 | struct hlist_head *head; | |
c90681b8 AQ |
1194 | uint32_t i; |
1195 | int j; | |
a73105b8 AQ |
1196 | |
1197 | for (i = 0; i < hash->size; i++) { | |
1198 | head = &hash->table[i]; | |
1199 | ||
1200 | rcu_read_lock(); | |
acd34afa | 1201 | hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) { |
56303d34 SE |
1202 | tt_global = container_of(tt_common, |
1203 | struct batadv_tt_global_entry, | |
1204 | common); | |
db08e6e5 SW |
1205 | /* Roaming clients are in the global table for |
1206 | * consistency only. They don't have to be | |
1207 | * taken into account while computing the | |
1208 | * global crc | |
1209 | */ | |
acd34afa | 1210 | if (tt_common->flags & BATADV_TT_CLIENT_ROAM) |
db08e6e5 SW |
1211 | continue; |
1212 | ||
1213 | /* find out if this global entry is announced by this | |
1214 | * originator | |
1215 | */ | |
56303d34 | 1216 | if (!batadv_tt_global_entry_has_orig(tt_global, |
a513088d | 1217 | orig_node)) |
db08e6e5 SW |
1218 | continue; |
1219 | ||
1220 | total_one = 0; | |
1221 | for (j = 0; j < ETH_ALEN; j++) | |
1222 | total_one = crc16_byte(total_one, | |
acd34afa | 1223 | tt_common->addr[j]); |
db08e6e5 | 1224 | total ^= total_one; |
a73105b8 AQ |
1225 | } |
1226 | rcu_read_unlock(); | |
1227 | } | |
1228 | ||
1229 | return total; | |
1230 | } | |
1231 | ||
1232 | /* Calculates the checksum of the local table */ | |
56303d34 | 1233 | static uint16_t batadv_tt_local_crc(struct batadv_priv *bat_priv) |
a73105b8 AQ |
1234 | { |
1235 | uint16_t total = 0, total_one; | |
5bf74e9c | 1236 | struct batadv_hashtable *hash = bat_priv->tt_local_hash; |
56303d34 | 1237 | struct batadv_tt_common_entry *tt_common; |
a73105b8 AQ |
1238 | struct hlist_node *node; |
1239 | struct hlist_head *head; | |
c90681b8 AQ |
1240 | uint32_t i; |
1241 | int j; | |
a73105b8 AQ |
1242 | |
1243 | for (i = 0; i < hash->size; i++) { | |
1244 | head = &hash->table[i]; | |
1245 | ||
1246 | rcu_read_lock(); | |
acd34afa | 1247 | hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) { |
058d0e26 | 1248 | /* not yet committed clients have not to be taken into |
9cfc7bd6 SE |
1249 | * account while computing the CRC |
1250 | */ | |
acd34afa | 1251 | if (tt_common->flags & BATADV_TT_CLIENT_NEW) |
058d0e26 | 1252 | continue; |
a73105b8 AQ |
1253 | total_one = 0; |
1254 | for (j = 0; j < ETH_ALEN; j++) | |
1255 | total_one = crc16_byte(total_one, | |
acd34afa | 1256 | tt_common->addr[j]); |
a73105b8 AQ |
1257 | total ^= total_one; |
1258 | } | |
a73105b8 AQ |
1259 | rcu_read_unlock(); |
1260 | } | |
1261 | ||
1262 | return total; | |
1263 | } | |
1264 | ||
56303d34 | 1265 | static void batadv_tt_req_list_free(struct batadv_priv *bat_priv) |
a73105b8 | 1266 | { |
56303d34 | 1267 | struct batadv_tt_req_node *node, *safe; |
a73105b8 AQ |
1268 | |
1269 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1270 | ||
1271 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
1272 | list_del(&node->list); | |
1273 | kfree(node); | |
1274 | } | |
1275 | ||
1276 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1277 | } | |
1278 | ||
56303d34 SE |
1279 | static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv, |
1280 | struct batadv_orig_node *orig_node, | |
a513088d SE |
1281 | const unsigned char *tt_buff, |
1282 | uint8_t tt_num_changes) | |
a73105b8 | 1283 | { |
08c36d3e | 1284 | uint16_t tt_buff_len = batadv_tt_len(tt_num_changes); |
a73105b8 AQ |
1285 | |
1286 | /* Replace the old buffer only if I received something in the | |
9cfc7bd6 SE |
1287 | * last OGM (the OGM could carry no changes) |
1288 | */ | |
a73105b8 AQ |
1289 | spin_lock_bh(&orig_node->tt_buff_lock); |
1290 | if (tt_buff_len > 0) { | |
1291 | kfree(orig_node->tt_buff); | |
1292 | orig_node->tt_buff_len = 0; | |
1293 | orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); | |
1294 | if (orig_node->tt_buff) { | |
1295 | memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); | |
1296 | orig_node->tt_buff_len = tt_buff_len; | |
1297 | } | |
1298 | } | |
1299 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1300 | } | |
1301 | ||
56303d34 | 1302 | static void batadv_tt_req_purge(struct batadv_priv *bat_priv) |
a73105b8 | 1303 | { |
56303d34 | 1304 | struct batadv_tt_req_node *node, *safe; |
a73105b8 AQ |
1305 | |
1306 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1307 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
42d0b044 SE |
1308 | if (batadv_has_timed_out(node->issued_at, |
1309 | BATADV_TT_REQUEST_TIMEOUT)) { | |
a73105b8 AQ |
1310 | list_del(&node->list); |
1311 | kfree(node); | |
1312 | } | |
1313 | } | |
1314 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1315 | } | |
1316 | ||
1317 | /* returns the pointer to the new tt_req_node struct if no request | |
9cfc7bd6 SE |
1318 | * has already been issued for this orig_node, NULL otherwise |
1319 | */ | |
56303d34 SE |
1320 | static struct batadv_tt_req_node * |
1321 | batadv_new_tt_req_node(struct batadv_priv *bat_priv, | |
1322 | struct batadv_orig_node *orig_node) | |
a73105b8 | 1323 | { |
56303d34 | 1324 | struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; |
a73105b8 AQ |
1325 | |
1326 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1327 | list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) { | |
1eda58bf SE |
1328 | if (batadv_compare_eth(tt_req_node_tmp, orig_node) && |
1329 | !batadv_has_timed_out(tt_req_node_tmp->issued_at, | |
42d0b044 | 1330 | BATADV_TT_REQUEST_TIMEOUT)) |
a73105b8 AQ |
1331 | goto unlock; |
1332 | } | |
1333 | ||
1334 | tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); | |
1335 | if (!tt_req_node) | |
1336 | goto unlock; | |
1337 | ||
1338 | memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); | |
1339 | tt_req_node->issued_at = jiffies; | |
1340 | ||
1341 | list_add(&tt_req_node->list, &bat_priv->tt_req_list); | |
1342 | unlock: | |
1343 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1344 | return tt_req_node; | |
1345 | } | |
1346 | ||
058d0e26 | 1347 | /* data_ptr is useless here, but has to be kept to respect the prototype */ |
a513088d SE |
1348 | static int batadv_tt_local_valid_entry(const void *entry_ptr, |
1349 | const void *data_ptr) | |
058d0e26 | 1350 | { |
56303d34 | 1351 | const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; |
058d0e26 | 1352 | |
acd34afa | 1353 | if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW) |
058d0e26 AQ |
1354 | return 0; |
1355 | return 1; | |
1356 | } | |
1357 | ||
a513088d SE |
1358 | static int batadv_tt_global_valid(const void *entry_ptr, |
1359 | const void *data_ptr) | |
a73105b8 | 1360 | { |
56303d34 SE |
1361 | const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; |
1362 | const struct batadv_tt_global_entry *tt_global_entry; | |
1363 | const struct batadv_orig_node *orig_node = data_ptr; | |
a73105b8 | 1364 | |
acd34afa | 1365 | if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM) |
cc47f66e AQ |
1366 | return 0; |
1367 | ||
56303d34 SE |
1368 | tt_global_entry = container_of(tt_common_entry, |
1369 | struct batadv_tt_global_entry, | |
48100bac AQ |
1370 | common); |
1371 | ||
a513088d | 1372 | return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node); |
a73105b8 AQ |
1373 | } |
1374 | ||
a513088d SE |
1375 | static struct sk_buff * |
1376 | batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, | |
5bf74e9c | 1377 | struct batadv_hashtable *hash, |
56303d34 | 1378 | struct batadv_hard_iface *primary_if, |
a513088d SE |
1379 | int (*valid_cb)(const void *, const void *), |
1380 | void *cb_data) | |
a73105b8 | 1381 | { |
56303d34 | 1382 | struct batadv_tt_common_entry *tt_common_entry; |
96412690 SE |
1383 | struct batadv_tt_query_packet *tt_response; |
1384 | struct batadv_tt_change *tt_change; | |
a73105b8 AQ |
1385 | struct hlist_node *node; |
1386 | struct hlist_head *head; | |
1387 | struct sk_buff *skb = NULL; | |
1388 | uint16_t tt_tot, tt_count; | |
96412690 | 1389 | ssize_t tt_query_size = sizeof(struct batadv_tt_query_packet); |
c90681b8 | 1390 | uint32_t i; |
96412690 | 1391 | size_t len; |
a73105b8 AQ |
1392 | |
1393 | if (tt_query_size + tt_len > primary_if->soft_iface->mtu) { | |
1394 | tt_len = primary_if->soft_iface->mtu - tt_query_size; | |
96412690 | 1395 | tt_len -= tt_len % sizeof(struct batadv_tt_change); |
a73105b8 | 1396 | } |
96412690 | 1397 | tt_tot = tt_len / sizeof(struct batadv_tt_change); |
a73105b8 | 1398 | |
96412690 SE |
1399 | len = tt_query_size + tt_len; |
1400 | skb = dev_alloc_skb(len + ETH_HLEN); | |
a73105b8 AQ |
1401 | if (!skb) |
1402 | goto out; | |
1403 | ||
1404 | skb_reserve(skb, ETH_HLEN); | |
96412690 | 1405 | tt_response = (struct batadv_tt_query_packet *)skb_put(skb, len); |
a73105b8 | 1406 | tt_response->ttvn = ttvn; |
a73105b8 | 1407 | |
96412690 | 1408 | tt_change = (struct batadv_tt_change *)(skb->data + tt_query_size); |
a73105b8 AQ |
1409 | tt_count = 0; |
1410 | ||
1411 | rcu_read_lock(); | |
1412 | for (i = 0; i < hash->size; i++) { | |
1413 | head = &hash->table[i]; | |
1414 | ||
48100bac | 1415 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 AQ |
1416 | head, hash_entry) { |
1417 | if (tt_count == tt_tot) | |
1418 | break; | |
1419 | ||
48100bac | 1420 | if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data))) |
a73105b8 AQ |
1421 | continue; |
1422 | ||
48100bac AQ |
1423 | memcpy(tt_change->addr, tt_common_entry->addr, |
1424 | ETH_ALEN); | |
42d0b044 | 1425 | tt_change->flags = BATADV_NO_FLAGS; |
a73105b8 AQ |
1426 | |
1427 | tt_count++; | |
1428 | tt_change++; | |
1429 | } | |
1430 | } | |
1431 | rcu_read_unlock(); | |
1432 | ||
9d852393 | 1433 | /* store in the message the number of entries we have successfully |
9cfc7bd6 SE |
1434 | * copied |
1435 | */ | |
9d852393 AQ |
1436 | tt_response->tt_data = htons(tt_count); |
1437 | ||
a73105b8 AQ |
1438 | out: |
1439 | return skb; | |
1440 | } | |
1441 | ||
56303d34 SE |
1442 | static int batadv_send_tt_request(struct batadv_priv *bat_priv, |
1443 | struct batadv_orig_node *dst_orig_node, | |
a513088d SE |
1444 | uint8_t ttvn, uint16_t tt_crc, |
1445 | bool full_table) | |
a73105b8 AQ |
1446 | { |
1447 | struct sk_buff *skb = NULL; | |
96412690 | 1448 | struct batadv_tt_query_packet *tt_request; |
56303d34 SE |
1449 | struct batadv_neigh_node *neigh_node = NULL; |
1450 | struct batadv_hard_iface *primary_if; | |
1451 | struct batadv_tt_req_node *tt_req_node = NULL; | |
a73105b8 | 1452 | int ret = 1; |
96412690 | 1453 | size_t tt_req_len; |
a73105b8 | 1454 | |
e5d89254 | 1455 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1456 | if (!primary_if) |
1457 | goto out; | |
1458 | ||
1459 | /* The new tt_req will be issued only if I'm not waiting for a | |
9cfc7bd6 SE |
1460 | * reply from the same orig_node yet |
1461 | */ | |
a513088d | 1462 | tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node); |
a73105b8 AQ |
1463 | if (!tt_req_node) |
1464 | goto out; | |
1465 | ||
96412690 | 1466 | skb = dev_alloc_skb(sizeof(*tt_request) + ETH_HLEN); |
a73105b8 AQ |
1467 | if (!skb) |
1468 | goto out; | |
1469 | ||
1470 | skb_reserve(skb, ETH_HLEN); | |
1471 | ||
96412690 SE |
1472 | tt_req_len = sizeof(*tt_request); |
1473 | tt_request = (struct batadv_tt_query_packet *)skb_put(skb, tt_req_len); | |
a73105b8 | 1474 | |
acd34afa | 1475 | tt_request->header.packet_type = BATADV_TT_QUERY; |
7e071c79 | 1476 | tt_request->header.version = BATADV_COMPAT_VERSION; |
a73105b8 AQ |
1477 | memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1478 | memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN); | |
42d0b044 | 1479 | tt_request->header.ttl = BATADV_TTL; |
a73105b8 | 1480 | tt_request->ttvn = ttvn; |
6d2003fc | 1481 | tt_request->tt_data = htons(tt_crc); |
acd34afa | 1482 | tt_request->flags = BATADV_TT_REQUEST; |
a73105b8 AQ |
1483 | |
1484 | if (full_table) | |
acd34afa | 1485 | tt_request->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1486 | |
7d211efc | 1487 | neigh_node = batadv_orig_node_get_router(dst_orig_node); |
a73105b8 AQ |
1488 | if (!neigh_node) |
1489 | goto out; | |
1490 | ||
39c75a51 | 1491 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1492 | "Sending TT_REQUEST to %pM via %pM [%c]\n", |
1493 | dst_orig_node->orig, neigh_node->addr, | |
1494 | (full_table ? 'F' : '.')); | |
a73105b8 | 1495 | |
d69909d2 | 1496 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX); |
f8214865 | 1497 | |
9455e34c | 1498 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1499 | ret = 0; |
1500 | ||
1501 | out: | |
1502 | if (neigh_node) | |
7d211efc | 1503 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1504 | if (primary_if) |
e5d89254 | 1505 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1506 | if (ret) |
1507 | kfree_skb(skb); | |
1508 | if (ret && tt_req_node) { | |
1509 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1510 | list_del(&tt_req_node->list); | |
1511 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1512 | kfree(tt_req_node); | |
1513 | } | |
1514 | return ret; | |
1515 | } | |
1516 | ||
96412690 | 1517 | static bool |
56303d34 | 1518 | batadv_send_other_tt_response(struct batadv_priv *bat_priv, |
96412690 | 1519 | struct batadv_tt_query_packet *tt_request) |
a73105b8 | 1520 | { |
56303d34 SE |
1521 | struct batadv_orig_node *req_dst_orig_node = NULL; |
1522 | struct batadv_orig_node *res_dst_orig_node = NULL; | |
1523 | struct batadv_neigh_node *neigh_node = NULL; | |
1524 | struct batadv_hard_iface *primary_if = NULL; | |
a73105b8 AQ |
1525 | uint8_t orig_ttvn, req_ttvn, ttvn; |
1526 | int ret = false; | |
1527 | unsigned char *tt_buff; | |
1528 | bool full_table; | |
1529 | uint16_t tt_len, tt_tot; | |
1530 | struct sk_buff *skb = NULL; | |
96412690 SE |
1531 | struct batadv_tt_query_packet *tt_response; |
1532 | size_t len; | |
a73105b8 | 1533 | |
39c75a51 | 1534 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1535 | "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", |
1536 | tt_request->src, tt_request->ttvn, tt_request->dst, | |
acd34afa | 1537 | (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 AQ |
1538 | |
1539 | /* Let's get the orig node of the REAL destination */ | |
da641193 | 1540 | req_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->dst); |
a73105b8 AQ |
1541 | if (!req_dst_orig_node) |
1542 | goto out; | |
1543 | ||
da641193 | 1544 | res_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1545 | if (!res_dst_orig_node) |
1546 | goto out; | |
1547 | ||
7d211efc | 1548 | neigh_node = batadv_orig_node_get_router(res_dst_orig_node); |
a73105b8 AQ |
1549 | if (!neigh_node) |
1550 | goto out; | |
1551 | ||
e5d89254 | 1552 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1553 | if (!primary_if) |
1554 | goto out; | |
1555 | ||
1556 | orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1557 | req_ttvn = tt_request->ttvn; | |
1558 | ||
015758d0 | 1559 | /* I don't have the requested data */ |
a73105b8 | 1560 | if (orig_ttvn != req_ttvn || |
f25bd58a | 1561 | tt_request->tt_data != htons(req_dst_orig_node->tt_crc)) |
a73105b8 AQ |
1562 | goto out; |
1563 | ||
015758d0 | 1564 | /* If the full table has been explicitly requested */ |
acd34afa | 1565 | if (tt_request->flags & BATADV_TT_FULL_TABLE || |
a73105b8 AQ |
1566 | !req_dst_orig_node->tt_buff) |
1567 | full_table = true; | |
1568 | else | |
1569 | full_table = false; | |
1570 | ||
1571 | /* In this version, fragmentation is not implemented, then | |
9cfc7bd6 SE |
1572 | * I'll send only one packet with as much TT entries as I can |
1573 | */ | |
a73105b8 AQ |
1574 | if (!full_table) { |
1575 | spin_lock_bh(&req_dst_orig_node->tt_buff_lock); | |
1576 | tt_len = req_dst_orig_node->tt_buff_len; | |
96412690 | 1577 | tt_tot = tt_len / sizeof(struct batadv_tt_change); |
a73105b8 | 1578 | |
96412690 SE |
1579 | len = sizeof(*tt_response) + tt_len; |
1580 | skb = dev_alloc_skb(len + ETH_HLEN); | |
a73105b8 AQ |
1581 | if (!skb) |
1582 | goto unlock; | |
1583 | ||
1584 | skb_reserve(skb, ETH_HLEN); | |
96412690 SE |
1585 | tt_response = (struct batadv_tt_query_packet *)skb_put(skb, |
1586 | len); | |
a73105b8 AQ |
1587 | tt_response->ttvn = req_ttvn; |
1588 | tt_response->tt_data = htons(tt_tot); | |
1589 | ||
96412690 | 1590 | tt_buff = skb->data + sizeof(*tt_response); |
a73105b8 AQ |
1591 | /* Copy the last orig_node's OGM buffer */ |
1592 | memcpy(tt_buff, req_dst_orig_node->tt_buff, | |
1593 | req_dst_orig_node->tt_buff_len); | |
1594 | ||
1595 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1596 | } else { | |
96412690 SE |
1597 | tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size); |
1598 | tt_len *= sizeof(struct batadv_tt_change); | |
a73105b8 AQ |
1599 | ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); |
1600 | ||
a513088d SE |
1601 | skb = batadv_tt_response_fill_table(tt_len, ttvn, |
1602 | bat_priv->tt_global_hash, | |
1603 | primary_if, | |
1604 | batadv_tt_global_valid, | |
1605 | req_dst_orig_node); | |
a73105b8 AQ |
1606 | if (!skb) |
1607 | goto out; | |
1608 | ||
96412690 | 1609 | tt_response = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 AQ |
1610 | } |
1611 | ||
acd34afa | 1612 | tt_response->header.packet_type = BATADV_TT_QUERY; |
7e071c79 | 1613 | tt_response->header.version = BATADV_COMPAT_VERSION; |
42d0b044 | 1614 | tt_response->header.ttl = BATADV_TTL; |
a73105b8 AQ |
1615 | memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN); |
1616 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
acd34afa | 1617 | tt_response->flags = BATADV_TT_RESPONSE; |
a73105b8 AQ |
1618 | |
1619 | if (full_table) | |
acd34afa | 1620 | tt_response->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1621 | |
39c75a51 | 1622 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1623 | "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n", |
1624 | res_dst_orig_node->orig, neigh_node->addr, | |
1625 | req_dst_orig_node->orig, req_ttvn); | |
a73105b8 | 1626 | |
d69909d2 | 1627 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); |
f8214865 | 1628 | |
9455e34c | 1629 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1630 | ret = true; |
1631 | goto out; | |
1632 | ||
1633 | unlock: | |
1634 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1635 | ||
1636 | out: | |
1637 | if (res_dst_orig_node) | |
7d211efc | 1638 | batadv_orig_node_free_ref(res_dst_orig_node); |
a73105b8 | 1639 | if (req_dst_orig_node) |
7d211efc | 1640 | batadv_orig_node_free_ref(req_dst_orig_node); |
a73105b8 | 1641 | if (neigh_node) |
7d211efc | 1642 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1643 | if (primary_if) |
e5d89254 | 1644 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1645 | if (!ret) |
1646 | kfree_skb(skb); | |
1647 | return ret; | |
1648 | ||
1649 | } | |
96412690 SE |
1650 | |
1651 | static bool | |
56303d34 | 1652 | batadv_send_my_tt_response(struct batadv_priv *bat_priv, |
96412690 | 1653 | struct batadv_tt_query_packet *tt_request) |
a73105b8 | 1654 | { |
56303d34 SE |
1655 | struct batadv_orig_node *orig_node = NULL; |
1656 | struct batadv_neigh_node *neigh_node = NULL; | |
1657 | struct batadv_hard_iface *primary_if = NULL; | |
a73105b8 AQ |
1658 | uint8_t my_ttvn, req_ttvn, ttvn; |
1659 | int ret = false; | |
1660 | unsigned char *tt_buff; | |
1661 | bool full_table; | |
1662 | uint16_t tt_len, tt_tot; | |
1663 | struct sk_buff *skb = NULL; | |
96412690 SE |
1664 | struct batadv_tt_query_packet *tt_response; |
1665 | size_t len; | |
a73105b8 | 1666 | |
39c75a51 | 1667 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1668 | "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", |
1669 | tt_request->src, tt_request->ttvn, | |
acd34afa | 1670 | (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 AQ |
1671 | |
1672 | ||
1673 | my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); | |
1674 | req_ttvn = tt_request->ttvn; | |
1675 | ||
da641193 | 1676 | orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1677 | if (!orig_node) |
1678 | goto out; | |
1679 | ||
7d211efc | 1680 | neigh_node = batadv_orig_node_get_router(orig_node); |
a73105b8 AQ |
1681 | if (!neigh_node) |
1682 | goto out; | |
1683 | ||
e5d89254 | 1684 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1685 | if (!primary_if) |
1686 | goto out; | |
1687 | ||
1688 | /* If the full table has been explicitly requested or the gap | |
9cfc7bd6 SE |
1689 | * is too big send the whole local translation table |
1690 | */ | |
acd34afa | 1691 | if (tt_request->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn || |
a73105b8 AQ |
1692 | !bat_priv->tt_buff) |
1693 | full_table = true; | |
1694 | else | |
1695 | full_table = false; | |
1696 | ||
1697 | /* In this version, fragmentation is not implemented, then | |
9cfc7bd6 SE |
1698 | * I'll send only one packet with as much TT entries as I can |
1699 | */ | |
a73105b8 AQ |
1700 | if (!full_table) { |
1701 | spin_lock_bh(&bat_priv->tt_buff_lock); | |
1702 | tt_len = bat_priv->tt_buff_len; | |
96412690 | 1703 | tt_tot = tt_len / sizeof(struct batadv_tt_change); |
a73105b8 | 1704 | |
96412690 SE |
1705 | len = sizeof(*tt_response) + tt_len; |
1706 | skb = dev_alloc_skb(len + ETH_HLEN); | |
a73105b8 AQ |
1707 | if (!skb) |
1708 | goto unlock; | |
1709 | ||
1710 | skb_reserve(skb, ETH_HLEN); | |
96412690 SE |
1711 | tt_response = (struct batadv_tt_query_packet *)skb_put(skb, |
1712 | len); | |
a73105b8 AQ |
1713 | tt_response->ttvn = req_ttvn; |
1714 | tt_response->tt_data = htons(tt_tot); | |
1715 | ||
96412690 | 1716 | tt_buff = skb->data + sizeof(*tt_response); |
a73105b8 AQ |
1717 | memcpy(tt_buff, bat_priv->tt_buff, |
1718 | bat_priv->tt_buff_len); | |
1719 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1720 | } else { | |
96412690 SE |
1721 | tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt); |
1722 | tt_len *= sizeof(struct batadv_tt_change); | |
a73105b8 AQ |
1723 | ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); |
1724 | ||
a513088d SE |
1725 | skb = batadv_tt_response_fill_table(tt_len, ttvn, |
1726 | bat_priv->tt_local_hash, | |
1727 | primary_if, | |
1728 | batadv_tt_local_valid_entry, | |
1729 | NULL); | |
a73105b8 AQ |
1730 | if (!skb) |
1731 | goto out; | |
1732 | ||
96412690 | 1733 | tt_response = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 AQ |
1734 | } |
1735 | ||
acd34afa | 1736 | tt_response->header.packet_type = BATADV_TT_QUERY; |
7e071c79 | 1737 | tt_response->header.version = BATADV_COMPAT_VERSION; |
42d0b044 | 1738 | tt_response->header.ttl = BATADV_TTL; |
a73105b8 AQ |
1739 | memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1740 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
acd34afa | 1741 | tt_response->flags = BATADV_TT_RESPONSE; |
a73105b8 AQ |
1742 | |
1743 | if (full_table) | |
acd34afa | 1744 | tt_response->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1745 | |
39c75a51 | 1746 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1747 | "Sending TT_RESPONSE to %pM via %pM [%c]\n", |
1748 | orig_node->orig, neigh_node->addr, | |
acd34afa | 1749 | (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 | 1750 | |
d69909d2 | 1751 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); |
f8214865 | 1752 | |
9455e34c | 1753 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1754 | ret = true; |
1755 | goto out; | |
1756 | ||
1757 | unlock: | |
1758 | spin_unlock_bh(&bat_priv->tt_buff_lock); | |
1759 | out: | |
1760 | if (orig_node) | |
7d211efc | 1761 | batadv_orig_node_free_ref(orig_node); |
a73105b8 | 1762 | if (neigh_node) |
7d211efc | 1763 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1764 | if (primary_if) |
e5d89254 | 1765 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1766 | if (!ret) |
1767 | kfree_skb(skb); | |
1768 | /* This packet was for me, so it doesn't need to be re-routed */ | |
1769 | return true; | |
1770 | } | |
1771 | ||
56303d34 | 1772 | bool batadv_send_tt_response(struct batadv_priv *bat_priv, |
96412690 | 1773 | struct batadv_tt_query_packet *tt_request) |
a73105b8 | 1774 | { |
3193e8fd | 1775 | if (batadv_is_my_mac(tt_request->dst)) { |
20ff9d59 | 1776 | /* don't answer backbone gws! */ |
08adf151 | 1777 | if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src)) |
20ff9d59 SW |
1778 | return true; |
1779 | ||
a513088d | 1780 | return batadv_send_my_tt_response(bat_priv, tt_request); |
20ff9d59 | 1781 | } else { |
a513088d | 1782 | return batadv_send_other_tt_response(bat_priv, tt_request); |
20ff9d59 | 1783 | } |
a73105b8 AQ |
1784 | } |
1785 | ||
56303d34 SE |
1786 | static void _batadv_tt_update_changes(struct batadv_priv *bat_priv, |
1787 | struct batadv_orig_node *orig_node, | |
96412690 | 1788 | struct batadv_tt_change *tt_change, |
a513088d | 1789 | uint16_t tt_num_changes, uint8_t ttvn) |
a73105b8 AQ |
1790 | { |
1791 | int i; | |
a513088d | 1792 | int roams; |
a73105b8 AQ |
1793 | |
1794 | for (i = 0; i < tt_num_changes; i++) { | |
acd34afa SE |
1795 | if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) { |
1796 | roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM; | |
a513088d SE |
1797 | batadv_tt_global_del(bat_priv, orig_node, |
1798 | (tt_change + i)->addr, | |
d4f44692 AQ |
1799 | "tt removed by changes", |
1800 | roams); | |
08c36d3e | 1801 | } else { |
08c36d3e | 1802 | if (!batadv_tt_global_add(bat_priv, orig_node, |
d4f44692 AQ |
1803 | (tt_change + i)->addr, |
1804 | (tt_change + i)->flags, ttvn)) | |
a73105b8 AQ |
1805 | /* In case of problem while storing a |
1806 | * global_entry, we stop the updating | |
1807 | * procedure without committing the | |
1808 | * ttvn change. This will avoid to send | |
1809 | * corrupted data on tt_request | |
1810 | */ | |
1811 | return; | |
08c36d3e | 1812 | } |
a73105b8 | 1813 | } |
17071578 | 1814 | orig_node->tt_initialised = true; |
a73105b8 AQ |
1815 | } |
1816 | ||
56303d34 | 1817 | static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv, |
96412690 | 1818 | struct batadv_tt_query_packet *tt_response) |
a73105b8 | 1819 | { |
56303d34 | 1820 | struct batadv_orig_node *orig_node = NULL; |
a73105b8 | 1821 | |
da641193 | 1822 | orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); |
a73105b8 AQ |
1823 | if (!orig_node) |
1824 | goto out; | |
1825 | ||
1826 | /* Purge the old table first.. */ | |
08c36d3e | 1827 | batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table"); |
a73105b8 | 1828 | |
a513088d | 1829 | _batadv_tt_update_changes(bat_priv, orig_node, |
96412690 | 1830 | (struct batadv_tt_change *)(tt_response + 1), |
a513088d SE |
1831 | ntohs(tt_response->tt_data), |
1832 | tt_response->ttvn); | |
a73105b8 AQ |
1833 | |
1834 | spin_lock_bh(&orig_node->tt_buff_lock); | |
1835 | kfree(orig_node->tt_buff); | |
1836 | orig_node->tt_buff_len = 0; | |
1837 | orig_node->tt_buff = NULL; | |
1838 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1839 | ||
1840 | atomic_set(&orig_node->last_ttvn, tt_response->ttvn); | |
1841 | ||
1842 | out: | |
1843 | if (orig_node) | |
7d211efc | 1844 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
1845 | } |
1846 | ||
56303d34 SE |
1847 | static void batadv_tt_update_changes(struct batadv_priv *bat_priv, |
1848 | struct batadv_orig_node *orig_node, | |
a513088d | 1849 | uint16_t tt_num_changes, uint8_t ttvn, |
96412690 | 1850 | struct batadv_tt_change *tt_change) |
a73105b8 | 1851 | { |
a513088d SE |
1852 | _batadv_tt_update_changes(bat_priv, orig_node, tt_change, |
1853 | tt_num_changes, ttvn); | |
a73105b8 | 1854 | |
a513088d SE |
1855 | batadv_tt_save_orig_buffer(bat_priv, orig_node, |
1856 | (unsigned char *)tt_change, tt_num_changes); | |
a73105b8 AQ |
1857 | atomic_set(&orig_node->last_ttvn, ttvn); |
1858 | } | |
1859 | ||
56303d34 | 1860 | bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr) |
a73105b8 | 1861 | { |
56303d34 | 1862 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
7683fdc1 | 1863 | bool ret = false; |
a73105b8 | 1864 | |
a513088d | 1865 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
1866 | if (!tt_local_entry) |
1867 | goto out; | |
058d0e26 | 1868 | /* Check if the client has been logically deleted (but is kept for |
9cfc7bd6 SE |
1869 | * consistency purpose) |
1870 | */ | |
acd34afa | 1871 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) |
058d0e26 | 1872 | goto out; |
7683fdc1 AQ |
1873 | ret = true; |
1874 | out: | |
a73105b8 | 1875 | if (tt_local_entry) |
a513088d | 1876 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7683fdc1 | 1877 | return ret; |
a73105b8 AQ |
1878 | } |
1879 | ||
56303d34 | 1880 | void batadv_handle_tt_response(struct batadv_priv *bat_priv, |
96412690 | 1881 | struct batadv_tt_query_packet *tt_response) |
a73105b8 | 1882 | { |
56303d34 SE |
1883 | struct batadv_tt_req_node *node, *safe; |
1884 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1885 | struct batadv_tt_change *tt_change; |
a73105b8 | 1886 | |
39c75a51 | 1887 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1888 | "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", |
1889 | tt_response->src, tt_response->ttvn, | |
1890 | ntohs(tt_response->tt_data), | |
acd34afa | 1891 | (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 | 1892 | |
20ff9d59 | 1893 | /* we should have never asked a backbone gw */ |
08adf151 | 1894 | if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src)) |
20ff9d59 SW |
1895 | goto out; |
1896 | ||
da641193 | 1897 | orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); |
a73105b8 AQ |
1898 | if (!orig_node) |
1899 | goto out; | |
1900 | ||
96412690 | 1901 | if (tt_response->flags & BATADV_TT_FULL_TABLE) { |
a513088d | 1902 | batadv_tt_fill_gtable(bat_priv, tt_response); |
96412690 SE |
1903 | } else { |
1904 | tt_change = (struct batadv_tt_change *)(tt_response + 1); | |
a513088d SE |
1905 | batadv_tt_update_changes(bat_priv, orig_node, |
1906 | ntohs(tt_response->tt_data), | |
96412690 SE |
1907 | tt_response->ttvn, tt_change); |
1908 | } | |
a73105b8 AQ |
1909 | |
1910 | /* Delete the tt_req_node from pending tt_requests list */ | |
1911 | spin_lock_bh(&bat_priv->tt_req_list_lock); | |
1912 | list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) { | |
1eda58bf | 1913 | if (!batadv_compare_eth(node->addr, tt_response->src)) |
a73105b8 AQ |
1914 | continue; |
1915 | list_del(&node->list); | |
1916 | kfree(node); | |
1917 | } | |
1918 | spin_unlock_bh(&bat_priv->tt_req_list_lock); | |
1919 | ||
1920 | /* Recalculate the CRC for this orig_node and store it */ | |
a513088d | 1921 | orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); |
cc47f66e | 1922 | /* Roaming phase is over: tables are in sync again. I can |
9cfc7bd6 SE |
1923 | * unset the flag |
1924 | */ | |
cc47f66e | 1925 | orig_node->tt_poss_change = false; |
a73105b8 AQ |
1926 | out: |
1927 | if (orig_node) | |
7d211efc | 1928 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
1929 | } |
1930 | ||
56303d34 | 1931 | int batadv_tt_init(struct batadv_priv *bat_priv) |
a73105b8 | 1932 | { |
5346c35e | 1933 | int ret; |
a73105b8 | 1934 | |
a513088d | 1935 | ret = batadv_tt_local_init(bat_priv); |
5346c35e SE |
1936 | if (ret < 0) |
1937 | return ret; | |
1938 | ||
a513088d | 1939 | ret = batadv_tt_global_init(bat_priv); |
5346c35e SE |
1940 | if (ret < 0) |
1941 | return ret; | |
a73105b8 | 1942 | |
a513088d | 1943 | batadv_tt_start_timer(bat_priv); |
a73105b8 AQ |
1944 | |
1945 | return 1; | |
1946 | } | |
1947 | ||
56303d34 | 1948 | static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv) |
a73105b8 | 1949 | { |
56303d34 | 1950 | struct batadv_tt_roam_node *node, *safe; |
a73105b8 | 1951 | |
cc47f66e | 1952 | spin_lock_bh(&bat_priv->tt_roam_list_lock); |
a73105b8 | 1953 | |
cc47f66e AQ |
1954 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { |
1955 | list_del(&node->list); | |
1956 | kfree(node); | |
1957 | } | |
1958 | ||
1959 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1960 | } | |
1961 | ||
56303d34 | 1962 | static void batadv_tt_roam_purge(struct batadv_priv *bat_priv) |
cc47f66e | 1963 | { |
56303d34 | 1964 | struct batadv_tt_roam_node *node, *safe; |
cc47f66e AQ |
1965 | |
1966 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1967 | list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) { | |
42d0b044 SE |
1968 | if (!batadv_has_timed_out(node->first_time, |
1969 | BATADV_ROAMING_MAX_TIME)) | |
cc47f66e AQ |
1970 | continue; |
1971 | ||
1972 | list_del(&node->list); | |
1973 | kfree(node); | |
1974 | } | |
1975 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
1976 | } | |
1977 | ||
1978 | /* This function checks whether the client already reached the | |
1979 | * maximum number of possible roaming phases. In this case the ROAMING_ADV | |
1980 | * will not be sent. | |
1981 | * | |
9cfc7bd6 SE |
1982 | * returns true if the ROAMING_ADV can be sent, false otherwise |
1983 | */ | |
56303d34 | 1984 | static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, |
a513088d | 1985 | uint8_t *client) |
cc47f66e | 1986 | { |
56303d34 | 1987 | struct batadv_tt_roam_node *tt_roam_node; |
cc47f66e AQ |
1988 | bool ret = false; |
1989 | ||
1990 | spin_lock_bh(&bat_priv->tt_roam_list_lock); | |
1991 | /* The new tt_req will be issued only if I'm not waiting for a | |
9cfc7bd6 SE |
1992 | * reply from the same orig_node yet |
1993 | */ | |
cc47f66e | 1994 | list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) { |
1eda58bf | 1995 | if (!batadv_compare_eth(tt_roam_node->addr, client)) |
cc47f66e AQ |
1996 | continue; |
1997 | ||
1eda58bf | 1998 | if (batadv_has_timed_out(tt_roam_node->first_time, |
42d0b044 | 1999 | BATADV_ROAMING_MAX_TIME)) |
cc47f66e AQ |
2000 | continue; |
2001 | ||
3e34819e | 2002 | if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter)) |
cc47f66e AQ |
2003 | /* Sorry, you roamed too many times! */ |
2004 | goto unlock; | |
2005 | ret = true; | |
2006 | break; | |
2007 | } | |
2008 | ||
2009 | if (!ret) { | |
2010 | tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); | |
2011 | if (!tt_roam_node) | |
2012 | goto unlock; | |
2013 | ||
2014 | tt_roam_node->first_time = jiffies; | |
42d0b044 SE |
2015 | atomic_set(&tt_roam_node->counter, |
2016 | BATADV_ROAMING_MAX_COUNT - 1); | |
cc47f66e AQ |
2017 | memcpy(tt_roam_node->addr, client, ETH_ALEN); |
2018 | ||
2019 | list_add(&tt_roam_node->list, &bat_priv->tt_roam_list); | |
2020 | ret = true; | |
2021 | } | |
2022 | ||
2023 | unlock: | |
2024 | spin_unlock_bh(&bat_priv->tt_roam_list_lock); | |
2025 | return ret; | |
2026 | } | |
2027 | ||
56303d34 SE |
2028 | static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, |
2029 | struct batadv_orig_node *orig_node) | |
cc47f66e | 2030 | { |
56303d34 | 2031 | struct batadv_neigh_node *neigh_node = NULL; |
cc47f66e | 2032 | struct sk_buff *skb = NULL; |
96412690 | 2033 | struct batadv_roam_adv_packet *roam_adv_packet; |
cc47f66e | 2034 | int ret = 1; |
56303d34 | 2035 | struct batadv_hard_iface *primary_if; |
96412690 | 2036 | size_t len = sizeof(*roam_adv_packet); |
cc47f66e AQ |
2037 | |
2038 | /* before going on we have to check whether the client has | |
9cfc7bd6 SE |
2039 | * already roamed to us too many times |
2040 | */ | |
a513088d | 2041 | if (!batadv_tt_check_roam_count(bat_priv, client)) |
cc47f66e AQ |
2042 | goto out; |
2043 | ||
96412690 | 2044 | skb = dev_alloc_skb(sizeof(*roam_adv_packet) + ETH_HLEN); |
cc47f66e AQ |
2045 | if (!skb) |
2046 | goto out; | |
2047 | ||
2048 | skb_reserve(skb, ETH_HLEN); | |
2049 | ||
96412690 | 2050 | roam_adv_packet = (struct batadv_roam_adv_packet *)skb_put(skb, len); |
cc47f66e | 2051 | |
acd34afa | 2052 | roam_adv_packet->header.packet_type = BATADV_ROAM_ADV; |
7e071c79 | 2053 | roam_adv_packet->header.version = BATADV_COMPAT_VERSION; |
42d0b044 | 2054 | roam_adv_packet->header.ttl = BATADV_TTL; |
162d549c | 2055 | roam_adv_packet->reserved = 0; |
e5d89254 | 2056 | primary_if = batadv_primary_if_get_selected(bat_priv); |
cc47f66e AQ |
2057 | if (!primary_if) |
2058 | goto out; | |
2059 | memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN); | |
e5d89254 | 2060 | batadv_hardif_free_ref(primary_if); |
cc47f66e AQ |
2061 | memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN); |
2062 | memcpy(roam_adv_packet->client, client, ETH_ALEN); | |
2063 | ||
7d211efc | 2064 | neigh_node = batadv_orig_node_get_router(orig_node); |
cc47f66e AQ |
2065 | if (!neigh_node) |
2066 | goto out; | |
2067 | ||
39c75a51 | 2068 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
2069 | "Sending ROAMING_ADV to %pM (client %pM) via %pM\n", |
2070 | orig_node->orig, client, neigh_node->addr); | |
cc47f66e | 2071 | |
d69909d2 | 2072 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX); |
f8214865 | 2073 | |
9455e34c | 2074 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
cc47f66e AQ |
2075 | ret = 0; |
2076 | ||
2077 | out: | |
2078 | if (neigh_node) | |
7d211efc | 2079 | batadv_neigh_node_free_ref(neigh_node); |
cc47f66e AQ |
2080 | if (ret) |
2081 | kfree_skb(skb); | |
2082 | return; | |
a73105b8 AQ |
2083 | } |
2084 | ||
a513088d | 2085 | static void batadv_tt_purge(struct work_struct *work) |
a73105b8 | 2086 | { |
56303d34 SE |
2087 | struct delayed_work *delayed_work; |
2088 | struct batadv_priv *bat_priv; | |
2089 | ||
2090 | delayed_work = container_of(work, struct delayed_work, work); | |
2091 | bat_priv = container_of(delayed_work, struct batadv_priv, tt_work); | |
a73105b8 | 2092 | |
a513088d SE |
2093 | batadv_tt_local_purge(bat_priv); |
2094 | batadv_tt_global_roam_purge(bat_priv); | |
2095 | batadv_tt_req_purge(bat_priv); | |
2096 | batadv_tt_roam_purge(bat_priv); | |
a73105b8 | 2097 | |
a513088d | 2098 | batadv_tt_start_timer(bat_priv); |
a73105b8 | 2099 | } |
cc47f66e | 2100 | |
56303d34 | 2101 | void batadv_tt_free(struct batadv_priv *bat_priv) |
cc47f66e AQ |
2102 | { |
2103 | cancel_delayed_work_sync(&bat_priv->tt_work); | |
2104 | ||
a513088d SE |
2105 | batadv_tt_local_table_free(bat_priv); |
2106 | batadv_tt_global_table_free(bat_priv); | |
2107 | batadv_tt_req_list_free(bat_priv); | |
2108 | batadv_tt_changes_list_free(bat_priv); | |
2109 | batadv_tt_roam_list_free(bat_priv); | |
cc47f66e AQ |
2110 | |
2111 | kfree(bat_priv->tt_buff); | |
2112 | } | |
058d0e26 | 2113 | |
697f2531 | 2114 | /* This function will enable or disable the specified flags for all the entries |
9cfc7bd6 SE |
2115 | * in the given hash table and returns the number of modified entries |
2116 | */ | |
5bf74e9c SE |
2117 | static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash, |
2118 | uint16_t flags, bool enable) | |
058d0e26 | 2119 | { |
c90681b8 | 2120 | uint32_t i; |
697f2531 | 2121 | uint16_t changed_num = 0; |
058d0e26 AQ |
2122 | struct hlist_head *head; |
2123 | struct hlist_node *node; | |
56303d34 | 2124 | struct batadv_tt_common_entry *tt_common_entry; |
058d0e26 AQ |
2125 | |
2126 | if (!hash) | |
697f2531 | 2127 | goto out; |
058d0e26 AQ |
2128 | |
2129 | for (i = 0; i < hash->size; i++) { | |
2130 | head = &hash->table[i]; | |
2131 | ||
2132 | rcu_read_lock(); | |
48100bac | 2133 | hlist_for_each_entry_rcu(tt_common_entry, node, |
058d0e26 | 2134 | head, hash_entry) { |
697f2531 AQ |
2135 | if (enable) { |
2136 | if ((tt_common_entry->flags & flags) == flags) | |
2137 | continue; | |
2138 | tt_common_entry->flags |= flags; | |
2139 | } else { | |
2140 | if (!(tt_common_entry->flags & flags)) | |
2141 | continue; | |
2142 | tt_common_entry->flags &= ~flags; | |
2143 | } | |
2144 | changed_num++; | |
058d0e26 AQ |
2145 | } |
2146 | rcu_read_unlock(); | |
2147 | } | |
697f2531 AQ |
2148 | out: |
2149 | return changed_num; | |
058d0e26 AQ |
2150 | } |
2151 | ||
acd34afa | 2152 | /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */ |
56303d34 | 2153 | static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) |
058d0e26 | 2154 | { |
5bf74e9c | 2155 | struct batadv_hashtable *hash = bat_priv->tt_local_hash; |
56303d34 SE |
2156 | struct batadv_tt_common_entry *tt_common; |
2157 | struct batadv_tt_local_entry *tt_local; | |
058d0e26 AQ |
2158 | struct hlist_node *node, *node_tmp; |
2159 | struct hlist_head *head; | |
2160 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
c90681b8 | 2161 | uint32_t i; |
058d0e26 AQ |
2162 | |
2163 | if (!hash) | |
2164 | return; | |
2165 | ||
2166 | for (i = 0; i < hash->size; i++) { | |
2167 | head = &hash->table[i]; | |
2168 | list_lock = &hash->list_locks[i]; | |
2169 | ||
2170 | spin_lock_bh(list_lock); | |
acd34afa SE |
2171 | hlist_for_each_entry_safe(tt_common, node, node_tmp, head, |
2172 | hash_entry) { | |
2173 | if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING)) | |
058d0e26 AQ |
2174 | continue; |
2175 | ||
39c75a51 | 2176 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 2177 | "Deleting local tt entry (%pM): pending\n", |
acd34afa | 2178 | tt_common->addr); |
058d0e26 AQ |
2179 | |
2180 | atomic_dec(&bat_priv->num_local_tt); | |
2181 | hlist_del_rcu(node); | |
56303d34 SE |
2182 | tt_local = container_of(tt_common, |
2183 | struct batadv_tt_local_entry, | |
2184 | common); | |
2185 | batadv_tt_local_entry_free_ref(tt_local); | |
058d0e26 AQ |
2186 | } |
2187 | spin_unlock_bh(list_lock); | |
2188 | } | |
2189 | ||
2190 | } | |
2191 | ||
56303d34 | 2192 | static int batadv_tt_commit_changes(struct batadv_priv *bat_priv, |
a513088d SE |
2193 | unsigned char **packet_buff, |
2194 | int *packet_buff_len, int packet_min_len) | |
058d0e26 | 2195 | { |
be9aa4c1 ML |
2196 | uint16_t changed_num = 0; |
2197 | ||
2198 | if (atomic_read(&bat_priv->tt_local_changes) < 1) | |
2199 | return -ENOENT; | |
2200 | ||
a513088d | 2201 | changed_num = batadv_tt_set_flags(bat_priv->tt_local_hash, |
acd34afa | 2202 | BATADV_TT_CLIENT_NEW, false); |
be9aa4c1 ML |
2203 | |
2204 | /* all reset entries have to be counted as local entries */ | |
697f2531 | 2205 | atomic_add(changed_num, &bat_priv->num_local_tt); |
a513088d | 2206 | batadv_tt_local_purge_pending_clients(bat_priv); |
be9aa4c1 | 2207 | bat_priv->tt_crc = batadv_tt_local_crc(bat_priv); |
058d0e26 AQ |
2208 | |
2209 | /* Increment the TTVN only once per OGM interval */ | |
2210 | atomic_inc(&bat_priv->ttvn); | |
39c75a51 | 2211 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
2212 | "Local changes committed, updating to ttvn %u\n", |
2213 | (uint8_t)atomic_read(&bat_priv->ttvn)); | |
058d0e26 | 2214 | bat_priv->tt_poss_change = false; |
be9aa4c1 ML |
2215 | |
2216 | /* reset the sending counter */ | |
42d0b044 | 2217 | atomic_set(&bat_priv->tt_ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX); |
be9aa4c1 | 2218 | |
a513088d SE |
2219 | return batadv_tt_changes_fill_buff(bat_priv, packet_buff, |
2220 | packet_buff_len, packet_min_len); | |
be9aa4c1 ML |
2221 | } |
2222 | ||
2223 | /* when calling this function (hard_iface == primary_if) has to be true */ | |
56303d34 | 2224 | int batadv_tt_append_diff(struct batadv_priv *bat_priv, |
be9aa4c1 ML |
2225 | unsigned char **packet_buff, int *packet_buff_len, |
2226 | int packet_min_len) | |
2227 | { | |
2228 | int tt_num_changes; | |
2229 | ||
2230 | /* if at least one change happened */ | |
a513088d SE |
2231 | tt_num_changes = batadv_tt_commit_changes(bat_priv, packet_buff, |
2232 | packet_buff_len, | |
2233 | packet_min_len); | |
be9aa4c1 ML |
2234 | |
2235 | /* if the changes have been sent often enough */ | |
2236 | if ((tt_num_changes < 0) && | |
3e34819e | 2237 | (!batadv_atomic_dec_not_zero(&bat_priv->tt_ogm_append_cnt))) { |
a513088d SE |
2238 | batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, |
2239 | packet_min_len, packet_min_len); | |
be9aa4c1 ML |
2240 | tt_num_changes = 0; |
2241 | } | |
2242 | ||
2243 | return tt_num_changes; | |
058d0e26 | 2244 | } |
59b699cd | 2245 | |
56303d34 | 2246 | bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src, |
08c36d3e | 2247 | uint8_t *dst) |
59b699cd | 2248 | { |
56303d34 SE |
2249 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
2250 | struct batadv_tt_global_entry *tt_global_entry = NULL; | |
5870adc6 | 2251 | bool ret = false; |
59b699cd AQ |
2252 | |
2253 | if (!atomic_read(&bat_priv->ap_isolation)) | |
5870adc6 | 2254 | goto out; |
59b699cd | 2255 | |
a513088d | 2256 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst); |
59b699cd AQ |
2257 | if (!tt_local_entry) |
2258 | goto out; | |
2259 | ||
a513088d | 2260 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, src); |
59b699cd AQ |
2261 | if (!tt_global_entry) |
2262 | goto out; | |
2263 | ||
1f129fef | 2264 | if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) |
59b699cd AQ |
2265 | goto out; |
2266 | ||
5870adc6 | 2267 | ret = true; |
59b699cd AQ |
2268 | |
2269 | out: | |
2270 | if (tt_global_entry) | |
a513088d | 2271 | batadv_tt_global_entry_free_ref(tt_global_entry); |
59b699cd | 2272 | if (tt_local_entry) |
a513088d | 2273 | batadv_tt_local_entry_free_ref(tt_local_entry); |
59b699cd AQ |
2274 | return ret; |
2275 | } | |
a943cac1 | 2276 | |
56303d34 SE |
2277 | void batadv_tt_update_orig(struct batadv_priv *bat_priv, |
2278 | struct batadv_orig_node *orig_node, | |
08c36d3e SE |
2279 | const unsigned char *tt_buff, uint8_t tt_num_changes, |
2280 | uint8_t ttvn, uint16_t tt_crc) | |
a943cac1 ML |
2281 | { |
2282 | uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
2283 | bool full_table = true; | |
96412690 | 2284 | struct batadv_tt_change *tt_change; |
a943cac1 | 2285 | |
20ff9d59 | 2286 | /* don't care about a backbone gateways updates. */ |
08adf151 | 2287 | if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) |
20ff9d59 SW |
2288 | return; |
2289 | ||
17071578 | 2290 | /* orig table not initialised AND first diff is in the OGM OR the ttvn |
9cfc7bd6 SE |
2291 | * increased by one -> we can apply the attached changes |
2292 | */ | |
17071578 AQ |
2293 | if ((!orig_node->tt_initialised && ttvn == 1) || |
2294 | ttvn - orig_ttvn == 1) { | |
a943cac1 | 2295 | /* the OGM could not contain the changes due to their size or |
42d0b044 SE |
2296 | * because they have already been sent BATADV_TT_OGM_APPEND_MAX |
2297 | * times. | |
9cfc7bd6 SE |
2298 | * In this case send a tt request |
2299 | */ | |
a943cac1 ML |
2300 | if (!tt_num_changes) { |
2301 | full_table = false; | |
2302 | goto request_table; | |
2303 | } | |
2304 | ||
96412690 | 2305 | tt_change = (struct batadv_tt_change *)tt_buff; |
a513088d | 2306 | batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes, |
96412690 | 2307 | ttvn, tt_change); |
a943cac1 ML |
2308 | |
2309 | /* Even if we received the precomputed crc with the OGM, we | |
2310 | * prefer to recompute it to spot any possible inconsistency | |
9cfc7bd6 SE |
2311 | * in the global table |
2312 | */ | |
a513088d | 2313 | orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); |
a943cac1 ML |
2314 | |
2315 | /* The ttvn alone is not enough to guarantee consistency | |
2316 | * because a single value could represent different states | |
2317 | * (due to the wrap around). Thus a node has to check whether | |
2318 | * the resulting table (after applying the changes) is still | |
2319 | * consistent or not. E.g. a node could disconnect while its | |
2320 | * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case | |
2321 | * checking the CRC value is mandatory to detect the | |
9cfc7bd6 SE |
2322 | * inconsistency |
2323 | */ | |
a943cac1 ML |
2324 | if (orig_node->tt_crc != tt_crc) |
2325 | goto request_table; | |
2326 | ||
2327 | /* Roaming phase is over: tables are in sync again. I can | |
9cfc7bd6 SE |
2328 | * unset the flag |
2329 | */ | |
a943cac1 ML |
2330 | orig_node->tt_poss_change = false; |
2331 | } else { | |
2332 | /* if we missed more than one change or our tables are not | |
9cfc7bd6 SE |
2333 | * in sync anymore -> request fresh tt data |
2334 | */ | |
17071578 AQ |
2335 | if (!orig_node->tt_initialised || ttvn != orig_ttvn || |
2336 | orig_node->tt_crc != tt_crc) { | |
a943cac1 | 2337 | request_table: |
39c75a51 | 2338 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
2339 | "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n", |
2340 | orig_node->orig, ttvn, orig_ttvn, tt_crc, | |
2341 | orig_node->tt_crc, tt_num_changes); | |
a513088d SE |
2342 | batadv_send_tt_request(bat_priv, orig_node, ttvn, |
2343 | tt_crc, full_table); | |
a943cac1 ML |
2344 | return; |
2345 | } | |
2346 | } | |
2347 | } | |
3275e7cc AQ |
2348 | |
2349 | /* returns true whether we know that the client has moved from its old | |
2350 | * originator to another one. This entry is kept is still kept for consistency | |
2351 | * purposes | |
2352 | */ | |
56303d34 | 2353 | bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv, |
08c36d3e | 2354 | uint8_t *addr) |
3275e7cc | 2355 | { |
56303d34 | 2356 | struct batadv_tt_global_entry *tt_global_entry; |
3275e7cc AQ |
2357 | bool ret = false; |
2358 | ||
a513088d | 2359 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
3275e7cc AQ |
2360 | if (!tt_global_entry) |
2361 | goto out; | |
2362 | ||
acd34afa | 2363 | ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM; |
a513088d | 2364 | batadv_tt_global_entry_free_ref(tt_global_entry); |
3275e7cc AQ |
2365 | out: |
2366 | return ret; | |
2367 | } |