Commit | Line | Data |
---|---|---|
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); |
30cfd02b AQ |
37 | static void batadv_tt_global_del(struct batadv_priv *bat_priv, |
38 | struct batadv_orig_node *orig_node, | |
39 | const unsigned char *addr, | |
40 | const char *message, bool roaming); | |
c6c8fea2 | 41 | |
7aadf889 | 42 | /* returns 1 if they are the same mac addr */ |
a513088d | 43 | static int batadv_compare_tt(const struct hlist_node *node, const void *data2) |
7aadf889 | 44 | { |
56303d34 | 45 | const void *data1 = container_of(node, struct batadv_tt_common_entry, |
747e4221 | 46 | hash_entry); |
7aadf889 ML |
47 | |
48 | return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); | |
49 | } | |
50 | ||
56303d34 | 51 | static void batadv_tt_start_timer(struct batadv_priv *bat_priv) |
c6c8fea2 | 52 | { |
807736f6 SE |
53 | INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge); |
54 | queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work, | |
a73105b8 | 55 | msecs_to_jiffies(5000)); |
c6c8fea2 SE |
56 | } |
57 | ||
56303d34 | 58 | static struct batadv_tt_common_entry * |
5bf74e9c | 59 | batadv_tt_hash_find(struct batadv_hashtable *hash, const void *data) |
7aadf889 | 60 | { |
7aadf889 ML |
61 | struct hlist_head *head; |
62 | struct hlist_node *node; | |
56303d34 SE |
63 | struct batadv_tt_common_entry *tt_common_entry; |
64 | struct batadv_tt_common_entry *tt_common_entry_tmp = NULL; | |
c90681b8 | 65 | uint32_t index; |
7aadf889 ML |
66 | |
67 | if (!hash) | |
68 | return NULL; | |
69 | ||
da641193 | 70 | index = batadv_choose_orig(data, hash->size); |
7aadf889 ML |
71 | head = &hash->table[index]; |
72 | ||
73 | rcu_read_lock(); | |
48100bac | 74 | hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) { |
1eda58bf | 75 | if (!batadv_compare_eth(tt_common_entry, data)) |
7aadf889 ML |
76 | continue; |
77 | ||
48100bac | 78 | if (!atomic_inc_not_zero(&tt_common_entry->refcount)) |
7683fdc1 AQ |
79 | continue; |
80 | ||
48100bac | 81 | tt_common_entry_tmp = tt_common_entry; |
7aadf889 ML |
82 | break; |
83 | } | |
84 | rcu_read_unlock(); | |
85 | ||
48100bac | 86 | return tt_common_entry_tmp; |
7aadf889 ML |
87 | } |
88 | ||
56303d34 SE |
89 | static struct batadv_tt_local_entry * |
90 | batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const void *data) | |
7aadf889 | 91 | { |
56303d34 SE |
92 | struct batadv_tt_common_entry *tt_common_entry; |
93 | struct batadv_tt_local_entry *tt_local_entry = NULL; | |
7aadf889 | 94 | |
807736f6 | 95 | tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, data); |
48100bac AQ |
96 | if (tt_common_entry) |
97 | tt_local_entry = container_of(tt_common_entry, | |
56303d34 SE |
98 | struct batadv_tt_local_entry, |
99 | common); | |
48100bac AQ |
100 | return tt_local_entry; |
101 | } | |
7aadf889 | 102 | |
56303d34 SE |
103 | static struct batadv_tt_global_entry * |
104 | batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const void *data) | |
48100bac | 105 | { |
56303d34 SE |
106 | struct batadv_tt_common_entry *tt_common_entry; |
107 | struct batadv_tt_global_entry *tt_global_entry = NULL; | |
7683fdc1 | 108 | |
807736f6 | 109 | tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, data); |
48100bac AQ |
110 | if (tt_common_entry) |
111 | tt_global_entry = container_of(tt_common_entry, | |
56303d34 SE |
112 | struct batadv_tt_global_entry, |
113 | common); | |
48100bac | 114 | return tt_global_entry; |
7aadf889 | 115 | |
7aadf889 ML |
116 | } |
117 | ||
a513088d | 118 | static void |
56303d34 | 119 | batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry) |
7683fdc1 | 120 | { |
48100bac AQ |
121 | if (atomic_dec_and_test(&tt_local_entry->common.refcount)) |
122 | kfree_rcu(tt_local_entry, common.rcu); | |
7683fdc1 AQ |
123 | } |
124 | ||
a513088d | 125 | static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu) |
531027fc | 126 | { |
56303d34 SE |
127 | struct batadv_tt_common_entry *tt_common_entry; |
128 | struct batadv_tt_global_entry *tt_global_entry; | |
531027fc | 129 | |
56303d34 SE |
130 | tt_common_entry = container_of(rcu, struct batadv_tt_common_entry, rcu); |
131 | tt_global_entry = container_of(tt_common_entry, | |
132 | struct batadv_tt_global_entry, common); | |
531027fc | 133 | |
531027fc SW |
134 | kfree(tt_global_entry); |
135 | } | |
136 | ||
a513088d | 137 | static void |
56303d34 | 138 | batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry) |
7683fdc1 | 139 | { |
db08e6e5 | 140 | if (atomic_dec_and_test(&tt_global_entry->common.refcount)) { |
a513088d | 141 | batadv_tt_global_del_orig_list(tt_global_entry); |
48100bac | 142 | call_rcu(&tt_global_entry->common.rcu, |
a513088d | 143 | batadv_tt_global_entry_free_rcu); |
db08e6e5 SW |
144 | } |
145 | } | |
146 | ||
a513088d | 147 | static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu) |
db08e6e5 | 148 | { |
56303d34 | 149 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 | 150 | |
56303d34 | 151 | orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu); |
7d211efc | 152 | batadv_orig_node_free_ref(orig_entry->orig_node); |
db08e6e5 SW |
153 | kfree(orig_entry); |
154 | } | |
155 | ||
a513088d | 156 | static void |
56303d34 | 157 | batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry) |
db08e6e5 | 158 | { |
d657e621 AQ |
159 | if (!atomic_dec_and_test(&orig_entry->refcount)) |
160 | return; | |
29cb99de AQ |
161 | /* to avoid race conditions, immediately decrease the tt counter */ |
162 | atomic_dec(&orig_entry->orig_node->tt_size); | |
a513088d | 163 | call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu); |
7683fdc1 AQ |
164 | } |
165 | ||
56303d34 | 166 | static void batadv_tt_local_event(struct batadv_priv *bat_priv, |
a513088d | 167 | const uint8_t *addr, uint8_t flags) |
a73105b8 | 168 | { |
56303d34 | 169 | struct batadv_tt_change_node *tt_change_node, *entry, *safe; |
3b643de5 AQ |
170 | bool event_removed = false; |
171 | bool del_op_requested, del_op_entry; | |
a73105b8 AQ |
172 | |
173 | tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC); | |
174 | ||
175 | if (!tt_change_node) | |
176 | return; | |
177 | ||
ff66c975 | 178 | tt_change_node->change.flags = flags; |
a73105b8 AQ |
179 | memcpy(tt_change_node->change.addr, addr, ETH_ALEN); |
180 | ||
acd34afa | 181 | del_op_requested = flags & BATADV_TT_CLIENT_DEL; |
3b643de5 AQ |
182 | |
183 | /* check for ADD+DEL or DEL+ADD events */ | |
807736f6 SE |
184 | spin_lock_bh(&bat_priv->tt.changes_list_lock); |
185 | list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, | |
3b643de5 AQ |
186 | list) { |
187 | if (!batadv_compare_eth(entry->change.addr, addr)) | |
188 | continue; | |
189 | ||
190 | /* DEL+ADD in the same orig interval have no effect and can be | |
191 | * removed to avoid silly behaviour on the receiver side. The | |
192 | * other way around (ADD+DEL) can happen in case of roaming of | |
193 | * a client still in the NEW state. Roaming of NEW clients is | |
194 | * now possible due to automatically recognition of "temporary" | |
195 | * clients | |
196 | */ | |
acd34afa | 197 | del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL; |
3b643de5 AQ |
198 | if (!del_op_requested && del_op_entry) |
199 | goto del; | |
200 | if (del_op_requested && !del_op_entry) | |
201 | goto del; | |
202 | continue; | |
203 | del: | |
204 | list_del(&entry->list); | |
205 | kfree(entry); | |
155e4e12 | 206 | kfree(tt_change_node); |
3b643de5 AQ |
207 | event_removed = true; |
208 | goto unlock; | |
209 | } | |
210 | ||
a73105b8 | 211 | /* track the change in the OGMinterval list */ |
807736f6 | 212 | list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list); |
3b643de5 AQ |
213 | |
214 | unlock: | |
807736f6 | 215 | spin_unlock_bh(&bat_priv->tt.changes_list_lock); |
a73105b8 | 216 | |
3b643de5 | 217 | if (event_removed) |
807736f6 | 218 | atomic_dec(&bat_priv->tt.local_changes); |
3b643de5 | 219 | else |
807736f6 | 220 | atomic_inc(&bat_priv->tt.local_changes); |
a73105b8 AQ |
221 | } |
222 | ||
08c36d3e | 223 | int batadv_tt_len(int changes_num) |
a73105b8 | 224 | { |
96412690 | 225 | return changes_num * sizeof(struct batadv_tt_change); |
a73105b8 AQ |
226 | } |
227 | ||
56303d34 | 228 | static int batadv_tt_local_init(struct batadv_priv *bat_priv) |
c6c8fea2 | 229 | { |
807736f6 | 230 | if (bat_priv->tt.local_hash) |
5346c35e | 231 | return 0; |
c6c8fea2 | 232 | |
807736f6 | 233 | bat_priv->tt.local_hash = batadv_hash_new(1024); |
c6c8fea2 | 234 | |
807736f6 | 235 | if (!bat_priv->tt.local_hash) |
5346c35e | 236 | return -ENOMEM; |
c6c8fea2 | 237 | |
5346c35e | 238 | return 0; |
c6c8fea2 SE |
239 | } |
240 | ||
08c36d3e SE |
241 | void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, |
242 | int ifindex) | |
c6c8fea2 | 243 | { |
56303d34 SE |
244 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
245 | struct batadv_tt_local_entry *tt_local_entry = NULL; | |
246 | struct batadv_tt_global_entry *tt_global_entry = NULL; | |
db08e6e5 SW |
247 | struct hlist_head *head; |
248 | struct hlist_node *node; | |
56303d34 | 249 | struct batadv_tt_orig_list_entry *orig_entry; |
80b3f58c | 250 | int hash_added; |
c6c8fea2 | 251 | |
a513088d | 252 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
c6c8fea2 | 253 | |
2dafb49d AQ |
254 | if (tt_local_entry) { |
255 | tt_local_entry->last_seen = jiffies; | |
acd34afa SE |
256 | /* possibly unset the BATADV_TT_CLIENT_PENDING flag */ |
257 | tt_local_entry->common.flags &= ~BATADV_TT_CLIENT_PENDING; | |
7683fdc1 | 258 | goto out; |
c6c8fea2 SE |
259 | } |
260 | ||
704509b8 | 261 | tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC); |
2dafb49d | 262 | if (!tt_local_entry) |
7683fdc1 | 263 | goto out; |
a73105b8 | 264 | |
39c75a51 | 265 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 266 | "Creating new local tt entry: %pM (ttvn: %d)\n", addr, |
807736f6 | 267 | (uint8_t)atomic_read(&bat_priv->tt.vn)); |
c6c8fea2 | 268 | |
48100bac | 269 | memcpy(tt_local_entry->common.addr, addr, ETH_ALEN); |
42d0b044 | 270 | tt_local_entry->common.flags = BATADV_NO_FLAGS; |
9563877e | 271 | if (batadv_is_wifi_iface(ifindex)) |
acd34afa | 272 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_WIFI; |
48100bac AQ |
273 | atomic_set(&tt_local_entry->common.refcount, 2); |
274 | tt_local_entry->last_seen = jiffies; | |
30cfd02b | 275 | tt_local_entry->common.added_at = tt_local_entry->last_seen; |
c6c8fea2 SE |
276 | |
277 | /* the batman interface mac address should never be purged */ | |
1eda58bf | 278 | if (batadv_compare_eth(addr, soft_iface->dev_addr)) |
acd34afa | 279 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_NOPURGE; |
c6c8fea2 | 280 | |
c40ed2bf AQ |
281 | /* The local entry has to be marked as NEW to avoid to send it in |
282 | * a full table response going out before the next ttvn increment | |
9cfc7bd6 SE |
283 | * (consistency check) |
284 | */ | |
acd34afa | 285 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_NEW; |
c40ed2bf | 286 | |
807736f6 | 287 | hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt, |
da641193 SE |
288 | batadv_choose_orig, |
289 | &tt_local_entry->common, | |
c0a55929 | 290 | &tt_local_entry->common.hash_entry); |
80b3f58c SW |
291 | |
292 | if (unlikely(hash_added != 0)) { | |
293 | /* remove the reference for the hash */ | |
a513088d | 294 | batadv_tt_local_entry_free_ref(tt_local_entry); |
80b3f58c SW |
295 | goto out; |
296 | } | |
297 | ||
a513088d | 298 | batadv_tt_local_event(bat_priv, addr, tt_local_entry->common.flags); |
ff66c975 | 299 | |
c6c8fea2 | 300 | /* remove address from global hash if present */ |
a513088d | 301 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
c6c8fea2 | 302 | |
cc47f66e AQ |
303 | /* Check whether it is a roaming! */ |
304 | if (tt_global_entry) { | |
db08e6e5 SW |
305 | /* These node are probably going to update their tt table */ |
306 | head = &tt_global_entry->orig_list; | |
307 | rcu_read_lock(); | |
308 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
a513088d SE |
309 | batadv_send_roam_adv(bat_priv, |
310 | tt_global_entry->common.addr, | |
311 | orig_entry->orig_node); | |
db08e6e5 SW |
312 | } |
313 | rcu_read_unlock(); | |
314 | /* The global entry has to be marked as ROAMING and | |
315 | * has to be kept for consistency purpose | |
316 | */ | |
acd34afa | 317 | tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; |
03fc3070 | 318 | tt_global_entry->roam_at = jiffies; |
7683fdc1 AQ |
319 | } |
320 | out: | |
321 | if (tt_local_entry) | |
a513088d | 322 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7683fdc1 | 323 | if (tt_global_entry) |
a513088d | 324 | batadv_tt_global_entry_free_ref(tt_global_entry); |
c6c8fea2 SE |
325 | } |
326 | ||
a513088d SE |
327 | static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff, |
328 | int *packet_buff_len, | |
329 | int min_packet_len, | |
330 | int new_packet_len) | |
be9aa4c1 ML |
331 | { |
332 | unsigned char *new_buff; | |
333 | ||
334 | new_buff = kmalloc(new_packet_len, GFP_ATOMIC); | |
335 | ||
336 | /* keep old buffer if kmalloc should fail */ | |
337 | if (new_buff) { | |
338 | memcpy(new_buff, *packet_buff, min_packet_len); | |
339 | kfree(*packet_buff); | |
340 | *packet_buff = new_buff; | |
341 | *packet_buff_len = new_packet_len; | |
342 | } | |
343 | } | |
344 | ||
56303d34 | 345 | static void batadv_tt_prepare_packet_buff(struct batadv_priv *bat_priv, |
a513088d SE |
346 | unsigned char **packet_buff, |
347 | int *packet_buff_len, | |
348 | int min_packet_len) | |
be9aa4c1 | 349 | { |
56303d34 | 350 | struct batadv_hard_iface *primary_if; |
be9aa4c1 ML |
351 | int req_len; |
352 | ||
e5d89254 | 353 | primary_if = batadv_primary_if_get_selected(bat_priv); |
be9aa4c1 ML |
354 | |
355 | req_len = min_packet_len; | |
807736f6 | 356 | req_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes)); |
be9aa4c1 ML |
357 | |
358 | /* if we have too many changes for one packet don't send any | |
359 | * and wait for the tt table request which will be fragmented | |
360 | */ | |
361 | if ((!primary_if) || (req_len > primary_if->soft_iface->mtu)) | |
362 | req_len = min_packet_len; | |
363 | ||
a513088d SE |
364 | batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, |
365 | min_packet_len, req_len); | |
be9aa4c1 ML |
366 | |
367 | if (primary_if) | |
e5d89254 | 368 | batadv_hardif_free_ref(primary_if); |
be9aa4c1 ML |
369 | } |
370 | ||
56303d34 | 371 | static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv, |
a513088d SE |
372 | unsigned char **packet_buff, |
373 | int *packet_buff_len, | |
374 | int min_packet_len) | |
c6c8fea2 | 375 | { |
56303d34 | 376 | struct batadv_tt_change_node *entry, *safe; |
be9aa4c1 ML |
377 | int count = 0, tot_changes = 0, new_len; |
378 | unsigned char *tt_buff; | |
379 | ||
a513088d SE |
380 | batadv_tt_prepare_packet_buff(bat_priv, packet_buff, |
381 | packet_buff_len, min_packet_len); | |
c6c8fea2 | 382 | |
be9aa4c1 ML |
383 | new_len = *packet_buff_len - min_packet_len; |
384 | tt_buff = *packet_buff + min_packet_len; | |
385 | ||
386 | if (new_len > 0) | |
08c36d3e | 387 | tot_changes = new_len / batadv_tt_len(1); |
c6c8fea2 | 388 | |
807736f6 SE |
389 | spin_lock_bh(&bat_priv->tt.changes_list_lock); |
390 | atomic_set(&bat_priv->tt.local_changes, 0); | |
c6c8fea2 | 391 | |
807736f6 | 392 | list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, |
7c64fd98 | 393 | list) { |
a73105b8 | 394 | if (count < tot_changes) { |
08c36d3e | 395 | memcpy(tt_buff + batadv_tt_len(count), |
96412690 | 396 | &entry->change, sizeof(struct batadv_tt_change)); |
c6c8fea2 SE |
397 | count++; |
398 | } | |
a73105b8 AQ |
399 | list_del(&entry->list); |
400 | kfree(entry); | |
c6c8fea2 | 401 | } |
807736f6 | 402 | spin_unlock_bh(&bat_priv->tt.changes_list_lock); |
a73105b8 AQ |
403 | |
404 | /* Keep the buffer for possible tt_request */ | |
807736f6 SE |
405 | spin_lock_bh(&bat_priv->tt.last_changeset_lock); |
406 | kfree(bat_priv->tt.last_changeset); | |
407 | bat_priv->tt.last_changeset_len = 0; | |
408 | bat_priv->tt.last_changeset = NULL; | |
be9aa4c1 ML |
409 | /* check whether this new OGM has no changes due to size problems */ |
410 | if (new_len > 0) { | |
411 | /* if kmalloc() fails we will reply with the full table | |
a73105b8 AQ |
412 | * instead of providing the diff |
413 | */ | |
807736f6 SE |
414 | bat_priv->tt.last_changeset = kmalloc(new_len, GFP_ATOMIC); |
415 | if (bat_priv->tt.last_changeset) { | |
416 | memcpy(bat_priv->tt.last_changeset, tt_buff, new_len); | |
417 | bat_priv->tt.last_changeset_len = new_len; | |
a73105b8 AQ |
418 | } |
419 | } | |
807736f6 | 420 | spin_unlock_bh(&bat_priv->tt.last_changeset_lock); |
c6c8fea2 | 421 | |
08ad76ec | 422 | return count; |
c6c8fea2 SE |
423 | } |
424 | ||
08c36d3e | 425 | int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
426 | { |
427 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 428 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 429 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
56303d34 SE |
430 | struct batadv_tt_common_entry *tt_common_entry; |
431 | struct batadv_hard_iface *primary_if; | |
7aadf889 | 432 | struct hlist_node *node; |
c6c8fea2 | 433 | struct hlist_head *head; |
c90681b8 | 434 | uint32_t i; |
c6c8fea2 | 435 | |
30da63a6 ML |
436 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
437 | if (!primary_if) | |
32ae9b22 | 438 | goto out; |
c6c8fea2 | 439 | |
86ceb360 SE |
440 | seq_printf(seq, |
441 | "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n", | |
807736f6 | 442 | net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn)); |
c6c8fea2 | 443 | |
c6c8fea2 SE |
444 | for (i = 0; i < hash->size; i++) { |
445 | head = &hash->table[i]; | |
446 | ||
7aadf889 | 447 | rcu_read_lock(); |
48100bac | 448 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 449 | head, hash_entry) { |
d099c2c5 | 450 | seq_printf(seq, " * %pM [%c%c%c%c%c]\n", |
7c64fd98 SE |
451 | tt_common_entry->addr, |
452 | (tt_common_entry->flags & | |
acd34afa | 453 | BATADV_TT_CLIENT_ROAM ? 'R' : '.'), |
7c64fd98 | 454 | (tt_common_entry->flags & |
acd34afa | 455 | BATADV_TT_CLIENT_NOPURGE ? 'P' : '.'), |
7c64fd98 | 456 | (tt_common_entry->flags & |
acd34afa | 457 | BATADV_TT_CLIENT_NEW ? 'N' : '.'), |
7c64fd98 | 458 | (tt_common_entry->flags & |
acd34afa | 459 | BATADV_TT_CLIENT_PENDING ? 'X' : '.'), |
7c64fd98 | 460 | (tt_common_entry->flags & |
acd34afa | 461 | BATADV_TT_CLIENT_WIFI ? 'W' : '.')); |
c6c8fea2 | 462 | } |
7aadf889 | 463 | rcu_read_unlock(); |
c6c8fea2 | 464 | } |
32ae9b22 ML |
465 | out: |
466 | if (primary_if) | |
e5d89254 | 467 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 468 | return 0; |
c6c8fea2 SE |
469 | } |
470 | ||
56303d34 SE |
471 | static void |
472 | batadv_tt_local_set_pending(struct batadv_priv *bat_priv, | |
473 | struct batadv_tt_local_entry *tt_local_entry, | |
474 | uint16_t flags, const char *message) | |
c6c8fea2 | 475 | { |
a513088d SE |
476 | batadv_tt_local_event(bat_priv, tt_local_entry->common.addr, |
477 | tt_local_entry->common.flags | flags); | |
a73105b8 | 478 | |
015758d0 AQ |
479 | /* The local client has to be marked as "pending to be removed" but has |
480 | * to be kept in the table in order to send it in a full table | |
9cfc7bd6 SE |
481 | * response issued before the net ttvn increment (consistency check) |
482 | */ | |
acd34afa | 483 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING; |
c566dbbe | 484 | |
39c75a51 | 485 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
486 | "Local tt entry (%pM) pending to be removed: %s\n", |
487 | tt_local_entry->common.addr, message); | |
c6c8fea2 SE |
488 | } |
489 | ||
7f91d06c AQ |
490 | /** |
491 | * batadv_tt_local_remove - logically remove an entry from the local table | |
492 | * @bat_priv: the bat priv with all the soft interface information | |
493 | * @addr: the MAC address of the client to remove | |
494 | * @message: message to append to the log on deletion | |
495 | * @roaming: true if the deletion is due to a roaming event | |
496 | * | |
497 | * Returns the flags assigned to the local entry before being deleted | |
498 | */ | |
499 | uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv, | |
500 | const uint8_t *addr, const char *message, | |
501 | bool roaming) | |
c6c8fea2 | 502 | { |
56303d34 | 503 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
7f91d06c | 504 | uint16_t flags, curr_flags = BATADV_NO_FLAGS; |
c6c8fea2 | 505 | |
a513088d | 506 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
507 | if (!tt_local_entry) |
508 | goto out; | |
509 | ||
7f91d06c AQ |
510 | curr_flags = tt_local_entry->common.flags; |
511 | ||
acd34afa | 512 | flags = BATADV_TT_CLIENT_DEL; |
7c1fd91d | 513 | if (roaming) { |
acd34afa | 514 | flags |= BATADV_TT_CLIENT_ROAM; |
7c1fd91d AQ |
515 | /* mark the local client as ROAMed */ |
516 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM; | |
517 | } | |
42d0b044 SE |
518 | |
519 | batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags, message); | |
7f91d06c | 520 | |
7683fdc1 AQ |
521 | out: |
522 | if (tt_local_entry) | |
a513088d | 523 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7f91d06c AQ |
524 | |
525 | return curr_flags; | |
c6c8fea2 SE |
526 | } |
527 | ||
56303d34 | 528 | static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, |
acd34afa | 529 | struct hlist_head *head) |
c6c8fea2 | 530 | { |
56303d34 SE |
531 | struct batadv_tt_local_entry *tt_local_entry; |
532 | struct batadv_tt_common_entry *tt_common_entry; | |
7aadf889 | 533 | struct hlist_node *node, *node_tmp; |
acd34afa SE |
534 | |
535 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, head, | |
536 | hash_entry) { | |
537 | tt_local_entry = container_of(tt_common_entry, | |
56303d34 SE |
538 | struct batadv_tt_local_entry, |
539 | common); | |
acd34afa SE |
540 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE) |
541 | continue; | |
542 | ||
543 | /* entry already marked for deletion */ | |
544 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) | |
545 | continue; | |
546 | ||
547 | if (!batadv_has_timed_out(tt_local_entry->last_seen, | |
548 | BATADV_TT_LOCAL_TIMEOUT)) | |
549 | continue; | |
550 | ||
551 | batadv_tt_local_set_pending(bat_priv, tt_local_entry, | |
552 | BATADV_TT_CLIENT_DEL, "timed out"); | |
553 | } | |
554 | } | |
555 | ||
56303d34 | 556 | static void batadv_tt_local_purge(struct batadv_priv *bat_priv) |
acd34afa | 557 | { |
807736f6 | 558 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
c6c8fea2 | 559 | struct hlist_head *head; |
7683fdc1 | 560 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 561 | uint32_t i; |
c6c8fea2 | 562 | |
c6c8fea2 SE |
563 | for (i = 0; i < hash->size; i++) { |
564 | head = &hash->table[i]; | |
7683fdc1 | 565 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 566 | |
7683fdc1 | 567 | spin_lock_bh(list_lock); |
acd34afa | 568 | batadv_tt_local_purge_list(bat_priv, head); |
7683fdc1 | 569 | spin_unlock_bh(list_lock); |
c6c8fea2 SE |
570 | } |
571 | ||
c6c8fea2 SE |
572 | } |
573 | ||
56303d34 | 574 | static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 575 | { |
5bf74e9c | 576 | struct batadv_hashtable *hash; |
a73105b8 | 577 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
56303d34 SE |
578 | struct batadv_tt_common_entry *tt_common_entry; |
579 | struct batadv_tt_local_entry *tt_local; | |
7683fdc1 AQ |
580 | struct hlist_node *node, *node_tmp; |
581 | struct hlist_head *head; | |
c90681b8 | 582 | uint32_t i; |
a73105b8 | 583 | |
807736f6 | 584 | if (!bat_priv->tt.local_hash) |
c6c8fea2 SE |
585 | return; |
586 | ||
807736f6 | 587 | hash = bat_priv->tt.local_hash; |
a73105b8 AQ |
588 | |
589 | for (i = 0; i < hash->size; i++) { | |
590 | head = &hash->table[i]; | |
591 | list_lock = &hash->list_locks[i]; | |
592 | ||
593 | spin_lock_bh(list_lock); | |
48100bac | 594 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
a73105b8 AQ |
595 | head, hash_entry) { |
596 | hlist_del_rcu(node); | |
56303d34 SE |
597 | tt_local = container_of(tt_common_entry, |
598 | struct batadv_tt_local_entry, | |
599 | common); | |
600 | batadv_tt_local_entry_free_ref(tt_local); | |
a73105b8 AQ |
601 | } |
602 | spin_unlock_bh(list_lock); | |
603 | } | |
604 | ||
1a8eaf07 | 605 | batadv_hash_destroy(hash); |
a73105b8 | 606 | |
807736f6 | 607 | bat_priv->tt.local_hash = NULL; |
c6c8fea2 SE |
608 | } |
609 | ||
56303d34 | 610 | static int batadv_tt_global_init(struct batadv_priv *bat_priv) |
c6c8fea2 | 611 | { |
807736f6 | 612 | if (bat_priv->tt.global_hash) |
5346c35e | 613 | return 0; |
c6c8fea2 | 614 | |
807736f6 | 615 | bat_priv->tt.global_hash = batadv_hash_new(1024); |
c6c8fea2 | 616 | |
807736f6 | 617 | if (!bat_priv->tt.global_hash) |
5346c35e | 618 | return -ENOMEM; |
c6c8fea2 | 619 | |
5346c35e | 620 | return 0; |
c6c8fea2 SE |
621 | } |
622 | ||
56303d34 | 623 | static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 624 | { |
56303d34 | 625 | struct batadv_tt_change_node *entry, *safe; |
c6c8fea2 | 626 | |
807736f6 | 627 | spin_lock_bh(&bat_priv->tt.changes_list_lock); |
c6c8fea2 | 628 | |
807736f6 | 629 | list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, |
a73105b8 AQ |
630 | list) { |
631 | list_del(&entry->list); | |
632 | kfree(entry); | |
633 | } | |
c6c8fea2 | 634 | |
807736f6 SE |
635 | atomic_set(&bat_priv->tt.local_changes, 0); |
636 | spin_unlock_bh(&bat_priv->tt.changes_list_lock); | |
a73105b8 | 637 | } |
c6c8fea2 | 638 | |
d657e621 AQ |
639 | /* retrieves the orig_tt_list_entry belonging to orig_node from the |
640 | * batadv_tt_global_entry list | |
641 | * | |
642 | * returns it with an increased refcounter, NULL if not found | |
db08e6e5 | 643 | */ |
d657e621 AQ |
644 | static struct batadv_tt_orig_list_entry * |
645 | batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry, | |
646 | const struct batadv_orig_node *orig_node) | |
db08e6e5 | 647 | { |
d657e621 | 648 | struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL; |
db08e6e5 SW |
649 | const struct hlist_head *head; |
650 | struct hlist_node *node; | |
db08e6e5 SW |
651 | |
652 | rcu_read_lock(); | |
653 | head = &entry->orig_list; | |
654 | hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) { | |
d657e621 AQ |
655 | if (tmp_orig_entry->orig_node != orig_node) |
656 | continue; | |
657 | if (!atomic_inc_not_zero(&tmp_orig_entry->refcount)) | |
658 | continue; | |
659 | ||
660 | orig_entry = tmp_orig_entry; | |
661 | break; | |
db08e6e5 SW |
662 | } |
663 | rcu_read_unlock(); | |
d657e621 AQ |
664 | |
665 | return orig_entry; | |
666 | } | |
667 | ||
668 | /* find out if an orig_node is already in the list of a tt_global_entry. | |
669 | * returns true if found, false otherwise | |
670 | */ | |
671 | static bool | |
672 | batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry, | |
673 | const struct batadv_orig_node *orig_node) | |
674 | { | |
675 | struct batadv_tt_orig_list_entry *orig_entry; | |
676 | bool found = false; | |
677 | ||
678 | orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node); | |
679 | if (orig_entry) { | |
680 | found = true; | |
681 | batadv_tt_orig_list_entry_free_ref(orig_entry); | |
682 | } | |
683 | ||
db08e6e5 SW |
684 | return found; |
685 | } | |
686 | ||
a513088d | 687 | static void |
d657e621 | 688 | batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global, |
56303d34 | 689 | struct batadv_orig_node *orig_node, int ttvn) |
db08e6e5 | 690 | { |
56303d34 | 691 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 | 692 | |
d657e621 | 693 | orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node); |
30cfd02b AQ |
694 | if (orig_entry) { |
695 | /* refresh the ttvn: the current value could be a bogus one that | |
696 | * was added during a "temporary client detection" | |
697 | */ | |
698 | orig_entry->ttvn = ttvn; | |
d657e621 | 699 | goto out; |
30cfd02b | 700 | } |
d657e621 | 701 | |
db08e6e5 SW |
702 | orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC); |
703 | if (!orig_entry) | |
d657e621 | 704 | goto out; |
db08e6e5 SW |
705 | |
706 | INIT_HLIST_NODE(&orig_entry->list); | |
707 | atomic_inc(&orig_node->refcount); | |
708 | atomic_inc(&orig_node->tt_size); | |
709 | orig_entry->orig_node = orig_node; | |
710 | orig_entry->ttvn = ttvn; | |
d657e621 | 711 | atomic_set(&orig_entry->refcount, 2); |
db08e6e5 | 712 | |
d657e621 | 713 | spin_lock_bh(&tt_global->list_lock); |
db08e6e5 | 714 | hlist_add_head_rcu(&orig_entry->list, |
d657e621 AQ |
715 | &tt_global->orig_list); |
716 | spin_unlock_bh(&tt_global->list_lock); | |
717 | out: | |
718 | if (orig_entry) | |
719 | batadv_tt_orig_list_entry_free_ref(orig_entry); | |
db08e6e5 SW |
720 | } |
721 | ||
a73105b8 | 722 | /* caller must hold orig_node refcount */ |
56303d34 SE |
723 | int batadv_tt_global_add(struct batadv_priv *bat_priv, |
724 | struct batadv_orig_node *orig_node, | |
d4f44692 AQ |
725 | const unsigned char *tt_addr, uint8_t flags, |
726 | uint8_t ttvn) | |
a73105b8 | 727 | { |
56303d34 | 728 | struct batadv_tt_global_entry *tt_global_entry = NULL; |
7683fdc1 | 729 | int ret = 0; |
80b3f58c | 730 | int hash_added; |
56303d34 | 731 | struct batadv_tt_common_entry *common; |
7f91d06c | 732 | uint16_t local_flags; |
c6c8fea2 | 733 | |
a513088d | 734 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr); |
a73105b8 AQ |
735 | |
736 | if (!tt_global_entry) { | |
d4f44692 | 737 | tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC); |
a73105b8 | 738 | if (!tt_global_entry) |
7683fdc1 AQ |
739 | goto out; |
740 | ||
c0a55929 SE |
741 | common = &tt_global_entry->common; |
742 | memcpy(common->addr, tt_addr, ETH_ALEN); | |
db08e6e5 | 743 | |
d4f44692 | 744 | common->flags = flags; |
cc47f66e | 745 | tt_global_entry->roam_at = 0; |
fdf79320 AQ |
746 | /* node must store current time in case of roaming. This is |
747 | * needed to purge this entry out on timeout (if nobody claims | |
748 | * it) | |
749 | */ | |
750 | if (flags & BATADV_TT_CLIENT_ROAM) | |
751 | tt_global_entry->roam_at = jiffies; | |
c0a55929 | 752 | atomic_set(&common->refcount, 2); |
30cfd02b | 753 | common->added_at = jiffies; |
db08e6e5 SW |
754 | |
755 | INIT_HLIST_HEAD(&tt_global_entry->orig_list); | |
756 | spin_lock_init(&tt_global_entry->list_lock); | |
7683fdc1 | 757 | |
807736f6 | 758 | hash_added = batadv_hash_add(bat_priv->tt.global_hash, |
a513088d SE |
759 | batadv_compare_tt, |
760 | batadv_choose_orig, common, | |
761 | &common->hash_entry); | |
80b3f58c SW |
762 | |
763 | if (unlikely(hash_added != 0)) { | |
764 | /* remove the reference for the hash */ | |
a513088d | 765 | batadv_tt_global_entry_free_ref(tt_global_entry); |
80b3f58c SW |
766 | goto out_remove; |
767 | } | |
a73105b8 | 768 | } else { |
30cfd02b AQ |
769 | /* If there is already a global entry, we can use this one for |
770 | * our processing. | |
771 | * But if we are trying to add a temporary client we can exit | |
772 | * directly because the temporary information should never | |
773 | * override any already known client state (whatever it is) | |
774 | */ | |
775 | if (flags & BATADV_TT_CLIENT_TEMP) | |
776 | goto out; | |
777 | ||
778 | /* if the client was temporary added before receiving the first | |
779 | * OGM announcing it, we have to clear the TEMP flag | |
780 | */ | |
781 | tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_TEMP; | |
db08e6e5 | 782 | |
acd34afa SE |
783 | /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only |
784 | * one originator left in the list and we previously received a | |
db08e6e5 SW |
785 | * delete + roaming change for this originator. |
786 | * | |
787 | * We should first delete the old originator before adding the | |
788 | * new one. | |
789 | */ | |
acd34afa | 790 | if (tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM) { |
a513088d | 791 | batadv_tt_global_del_orig_list(tt_global_entry); |
acd34afa | 792 | tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM; |
db08e6e5 | 793 | tt_global_entry->roam_at = 0; |
a73105b8 AQ |
794 | } |
795 | } | |
30cfd02b | 796 | /* add the new orig_entry (if needed) or update it */ |
d657e621 | 797 | batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn); |
c6c8fea2 | 798 | |
39c75a51 | 799 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
800 | "Creating new global tt entry: %pM (via %pM)\n", |
801 | tt_global_entry->common.addr, orig_node->orig); | |
c10dba05 | 802 | ret = 1; |
c6c8fea2 | 803 | |
80b3f58c | 804 | out_remove: |
7f91d06c | 805 | |
a73105b8 | 806 | /* remove address from local hash if present */ |
7f91d06c AQ |
807 | local_flags = batadv_tt_local_remove(bat_priv, tt_addr, |
808 | "global tt received", | |
809 | flags & BATADV_TT_CLIENT_ROAM); | |
810 | tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI; | |
811 | ||
7683fdc1 AQ |
812 | out: |
813 | if (tt_global_entry) | |
a513088d | 814 | batadv_tt_global_entry_free_ref(tt_global_entry); |
7683fdc1 | 815 | return ret; |
c6c8fea2 SE |
816 | } |
817 | ||
db08e6e5 SW |
818 | /* print all orig nodes who announce the address for this global entry. |
819 | * it is assumed that the caller holds rcu_read_lock(); | |
820 | */ | |
a513088d | 821 | static void |
56303d34 | 822 | batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry, |
a513088d | 823 | struct seq_file *seq) |
db08e6e5 SW |
824 | { |
825 | struct hlist_head *head; | |
826 | struct hlist_node *node; | |
56303d34 SE |
827 | struct batadv_tt_orig_list_entry *orig_entry; |
828 | struct batadv_tt_common_entry *tt_common_entry; | |
db08e6e5 SW |
829 | uint16_t flags; |
830 | uint8_t last_ttvn; | |
831 | ||
832 | tt_common_entry = &tt_global_entry->common; | |
833 | ||
834 | head = &tt_global_entry->orig_list; | |
835 | ||
836 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
837 | flags = tt_common_entry->flags; | |
838 | last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn); | |
30cfd02b | 839 | seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c%c]\n", |
db08e6e5 SW |
840 | tt_global_entry->common.addr, orig_entry->ttvn, |
841 | orig_entry->orig_node->orig, last_ttvn, | |
acd34afa | 842 | (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), |
30cfd02b AQ |
843 | (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), |
844 | (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.')); | |
db08e6e5 SW |
845 | } |
846 | } | |
847 | ||
08c36d3e | 848 | int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
849 | { |
850 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 851 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 852 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
56303d34 SE |
853 | struct batadv_tt_common_entry *tt_common_entry; |
854 | struct batadv_tt_global_entry *tt_global; | |
855 | struct batadv_hard_iface *primary_if; | |
7aadf889 | 856 | struct hlist_node *node; |
c6c8fea2 | 857 | struct hlist_head *head; |
c90681b8 | 858 | uint32_t i; |
c6c8fea2 | 859 | |
30da63a6 ML |
860 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
861 | if (!primary_if) | |
32ae9b22 | 862 | goto out; |
c6c8fea2 | 863 | |
2dafb49d AQ |
864 | seq_printf(seq, |
865 | "Globally announced TT entries received via the mesh %s\n", | |
c6c8fea2 | 866 | net_dev->name); |
df6edb9e AQ |
867 | seq_printf(seq, " %-13s %s %-15s %s %s\n", |
868 | "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags"); | |
c6c8fea2 | 869 | |
c6c8fea2 SE |
870 | for (i = 0; i < hash->size; i++) { |
871 | head = &hash->table[i]; | |
872 | ||
7aadf889 | 873 | rcu_read_lock(); |
48100bac | 874 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 875 | head, hash_entry) { |
56303d34 SE |
876 | tt_global = container_of(tt_common_entry, |
877 | struct batadv_tt_global_entry, | |
878 | common); | |
879 | batadv_tt_global_print_entry(tt_global, seq); | |
c6c8fea2 | 880 | } |
7aadf889 | 881 | rcu_read_unlock(); |
c6c8fea2 | 882 | } |
32ae9b22 ML |
883 | out: |
884 | if (primary_if) | |
e5d89254 | 885 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 886 | return 0; |
c6c8fea2 SE |
887 | } |
888 | ||
db08e6e5 | 889 | /* deletes the orig list of a tt_global_entry */ |
a513088d | 890 | static void |
56303d34 | 891 | batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry) |
c6c8fea2 | 892 | { |
db08e6e5 SW |
893 | struct hlist_head *head; |
894 | struct hlist_node *node, *safe; | |
56303d34 | 895 | struct batadv_tt_orig_list_entry *orig_entry; |
a73105b8 | 896 | |
db08e6e5 SW |
897 | spin_lock_bh(&tt_global_entry->list_lock); |
898 | head = &tt_global_entry->orig_list; | |
899 | hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { | |
900 | hlist_del_rcu(node); | |
a513088d | 901 | batadv_tt_orig_list_entry_free_ref(orig_entry); |
db08e6e5 SW |
902 | } |
903 | spin_unlock_bh(&tt_global_entry->list_lock); | |
c6c8fea2 | 904 | |
db08e6e5 SW |
905 | } |
906 | ||
a513088d | 907 | static void |
56303d34 SE |
908 | batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv, |
909 | struct batadv_tt_global_entry *tt_global_entry, | |
910 | struct batadv_orig_node *orig_node, | |
a513088d | 911 | const char *message) |
db08e6e5 SW |
912 | { |
913 | struct hlist_head *head; | |
914 | struct hlist_node *node, *safe; | |
56303d34 | 915 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 SW |
916 | |
917 | spin_lock_bh(&tt_global_entry->list_lock); | |
918 | head = &tt_global_entry->orig_list; | |
919 | hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { | |
920 | if (orig_entry->orig_node == orig_node) { | |
39c75a51 | 921 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
922 | "Deleting %pM from global tt entry %pM: %s\n", |
923 | orig_node->orig, | |
924 | tt_global_entry->common.addr, message); | |
db08e6e5 | 925 | hlist_del_rcu(node); |
a513088d | 926 | batadv_tt_orig_list_entry_free_ref(orig_entry); |
db08e6e5 SW |
927 | } |
928 | } | |
929 | spin_unlock_bh(&tt_global_entry->list_lock); | |
930 | } | |
931 | ||
56303d34 SE |
932 | static void |
933 | batadv_tt_global_del_struct(struct batadv_priv *bat_priv, | |
934 | struct batadv_tt_global_entry *tt_global_entry, | |
935 | const char *message) | |
db08e6e5 | 936 | { |
39c75a51 SE |
937 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
938 | "Deleting global tt entry %pM: %s\n", | |
1eda58bf | 939 | tt_global_entry->common.addr, message); |
7683fdc1 | 940 | |
807736f6 | 941 | batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt, |
da641193 | 942 | batadv_choose_orig, tt_global_entry->common.addr); |
a513088d | 943 | batadv_tt_global_entry_free_ref(tt_global_entry); |
db08e6e5 | 944 | |
c6c8fea2 SE |
945 | } |
946 | ||
db08e6e5 | 947 | /* If the client is to be deleted, we check if it is the last origantor entry |
acd34afa SE |
948 | * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the |
949 | * timer, otherwise we simply remove the originator scheduled for deletion. | |
db08e6e5 | 950 | */ |
a513088d | 951 | static void |
56303d34 SE |
952 | batadv_tt_global_del_roaming(struct batadv_priv *bat_priv, |
953 | struct batadv_tt_global_entry *tt_global_entry, | |
954 | struct batadv_orig_node *orig_node, | |
955 | const char *message) | |
db08e6e5 SW |
956 | { |
957 | bool last_entry = true; | |
958 | struct hlist_head *head; | |
959 | struct hlist_node *node; | |
56303d34 | 960 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 SW |
961 | |
962 | /* no local entry exists, case 1: | |
963 | * Check if this is the last one or if other entries exist. | |
964 | */ | |
965 | ||
966 | rcu_read_lock(); | |
967 | head = &tt_global_entry->orig_list; | |
968 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
969 | if (orig_entry->orig_node != orig_node) { | |
970 | last_entry = false; | |
971 | break; | |
972 | } | |
973 | } | |
974 | rcu_read_unlock(); | |
975 | ||
976 | if (last_entry) { | |
977 | /* its the last one, mark for roaming. */ | |
acd34afa | 978 | tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; |
db08e6e5 SW |
979 | tt_global_entry->roam_at = jiffies; |
980 | } else | |
981 | /* there is another entry, we can simply delete this | |
982 | * one and can still use the other one. | |
983 | */ | |
a513088d SE |
984 | batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, |
985 | orig_node, message); | |
db08e6e5 SW |
986 | } |
987 | ||
988 | ||
989 | ||
56303d34 SE |
990 | static void batadv_tt_global_del(struct batadv_priv *bat_priv, |
991 | struct batadv_orig_node *orig_node, | |
a513088d SE |
992 | const unsigned char *addr, |
993 | const char *message, bool roaming) | |
a73105b8 | 994 | { |
56303d34 SE |
995 | struct batadv_tt_global_entry *tt_global_entry = NULL; |
996 | struct batadv_tt_local_entry *local_entry = NULL; | |
a73105b8 | 997 | |
a513088d | 998 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
db08e6e5 | 999 | if (!tt_global_entry) |
7683fdc1 | 1000 | goto out; |
a73105b8 | 1001 | |
db08e6e5 | 1002 | if (!roaming) { |
a513088d SE |
1003 | batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, |
1004 | orig_node, message); | |
db08e6e5 SW |
1005 | |
1006 | if (hlist_empty(&tt_global_entry->orig_list)) | |
a513088d SE |
1007 | batadv_tt_global_del_struct(bat_priv, tt_global_entry, |
1008 | message); | |
db08e6e5 SW |
1009 | |
1010 | goto out; | |
1011 | } | |
92f90f56 SE |
1012 | |
1013 | /* if we are deleting a global entry due to a roam | |
1014 | * event, there are two possibilities: | |
db08e6e5 SW |
1015 | * 1) the client roamed from node A to node B => if there |
1016 | * is only one originator left for this client, we mark | |
acd34afa | 1017 | * it with BATADV_TT_CLIENT_ROAM, we start a timer and we |
92f90f56 SE |
1018 | * wait for node B to claim it. In case of timeout |
1019 | * the entry is purged. | |
db08e6e5 SW |
1020 | * |
1021 | * If there are other originators left, we directly delete | |
1022 | * the originator. | |
92f90f56 | 1023 | * 2) the client roamed to us => we can directly delete |
9cfc7bd6 SE |
1024 | * the global entry, since it is useless now. |
1025 | */ | |
a513088d SE |
1026 | local_entry = batadv_tt_local_hash_find(bat_priv, |
1027 | tt_global_entry->common.addr); | |
1028 | if (local_entry) { | |
db08e6e5 | 1029 | /* local entry exists, case 2: client roamed to us. */ |
a513088d SE |
1030 | batadv_tt_global_del_orig_list(tt_global_entry); |
1031 | batadv_tt_global_del_struct(bat_priv, tt_global_entry, message); | |
db08e6e5 SW |
1032 | } else |
1033 | /* no local entry exists, case 1: check for roaming */ | |
a513088d SE |
1034 | batadv_tt_global_del_roaming(bat_priv, tt_global_entry, |
1035 | orig_node, message); | |
92f90f56 | 1036 | |
92f90f56 | 1037 | |
cc47f66e | 1038 | out: |
7683fdc1 | 1039 | if (tt_global_entry) |
a513088d SE |
1040 | batadv_tt_global_entry_free_ref(tt_global_entry); |
1041 | if (local_entry) | |
1042 | batadv_tt_local_entry_free_ref(local_entry); | |
a73105b8 AQ |
1043 | } |
1044 | ||
56303d34 SE |
1045 | void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, |
1046 | struct batadv_orig_node *orig_node, | |
1047 | const char *message) | |
c6c8fea2 | 1048 | { |
56303d34 SE |
1049 | struct batadv_tt_global_entry *tt_global; |
1050 | struct batadv_tt_common_entry *tt_common_entry; | |
c90681b8 | 1051 | uint32_t i; |
807736f6 | 1052 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
a73105b8 AQ |
1053 | struct hlist_node *node, *safe; |
1054 | struct hlist_head *head; | |
7683fdc1 | 1055 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c6c8fea2 | 1056 | |
6e801494 SW |
1057 | if (!hash) |
1058 | return; | |
1059 | ||
a73105b8 AQ |
1060 | for (i = 0; i < hash->size; i++) { |
1061 | head = &hash->table[i]; | |
7683fdc1 | 1062 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 1063 | |
7683fdc1 | 1064 | spin_lock_bh(list_lock); |
48100bac | 1065 | hlist_for_each_entry_safe(tt_common_entry, node, safe, |
7c64fd98 | 1066 | head, hash_entry) { |
56303d34 SE |
1067 | tt_global = container_of(tt_common_entry, |
1068 | struct batadv_tt_global_entry, | |
1069 | common); | |
db08e6e5 | 1070 | |
56303d34 | 1071 | batadv_tt_global_del_orig_entry(bat_priv, tt_global, |
a513088d | 1072 | orig_node, message); |
db08e6e5 | 1073 | |
56303d34 | 1074 | if (hlist_empty(&tt_global->orig_list)) { |
39c75a51 | 1075 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 1076 | "Deleting global tt entry %pM: %s\n", |
56303d34 | 1077 | tt_global->common.addr, message); |
7683fdc1 | 1078 | hlist_del_rcu(node); |
56303d34 | 1079 | batadv_tt_global_entry_free_ref(tt_global); |
7683fdc1 | 1080 | } |
a73105b8 | 1081 | } |
7683fdc1 | 1082 | spin_unlock_bh(list_lock); |
c6c8fea2 | 1083 | } |
17071578 | 1084 | orig_node->tt_initialised = false; |
c6c8fea2 SE |
1085 | } |
1086 | ||
30cfd02b AQ |
1087 | static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global, |
1088 | char **msg) | |
cc47f66e | 1089 | { |
30cfd02b AQ |
1090 | bool purge = false; |
1091 | unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT; | |
1092 | unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT; | |
42d0b044 | 1093 | |
30cfd02b AQ |
1094 | if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) && |
1095 | batadv_has_timed_out(tt_global->roam_at, roam_timeout)) { | |
1096 | purge = true; | |
1097 | *msg = "Roaming timeout\n"; | |
1098 | } | |
42d0b044 | 1099 | |
30cfd02b AQ |
1100 | if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) && |
1101 | batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) { | |
1102 | purge = true; | |
1103 | *msg = "Temporary client timeout\n"; | |
42d0b044 | 1104 | } |
30cfd02b AQ |
1105 | |
1106 | return purge; | |
42d0b044 SE |
1107 | } |
1108 | ||
30cfd02b | 1109 | static void batadv_tt_global_purge(struct batadv_priv *bat_priv) |
42d0b044 | 1110 | { |
807736f6 | 1111 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
cc47f66e | 1112 | struct hlist_head *head; |
30cfd02b | 1113 | struct hlist_node *node, *node_tmp; |
7683fdc1 | 1114 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 1115 | uint32_t i; |
30cfd02b AQ |
1116 | char *msg = NULL; |
1117 | struct batadv_tt_common_entry *tt_common; | |
1118 | struct batadv_tt_global_entry *tt_global; | |
cc47f66e | 1119 | |
cc47f66e AQ |
1120 | for (i = 0; i < hash->size; i++) { |
1121 | head = &hash->table[i]; | |
7683fdc1 | 1122 | list_lock = &hash->list_locks[i]; |
cc47f66e | 1123 | |
7683fdc1 | 1124 | spin_lock_bh(list_lock); |
30cfd02b AQ |
1125 | hlist_for_each_entry_safe(tt_common, node, node_tmp, head, |
1126 | hash_entry) { | |
1127 | tt_global = container_of(tt_common, | |
1128 | struct batadv_tt_global_entry, | |
1129 | common); | |
1130 | ||
1131 | if (!batadv_tt_global_to_purge(tt_global, &msg)) | |
1132 | continue; | |
1133 | ||
1134 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
1135 | "Deleting global tt entry (%pM): %s\n", | |
1136 | tt_global->common.addr, msg); | |
1137 | ||
1138 | hlist_del_rcu(node); | |
1139 | ||
1140 | batadv_tt_global_entry_free_ref(tt_global); | |
1141 | } | |
7683fdc1 | 1142 | spin_unlock_bh(list_lock); |
cc47f66e | 1143 | } |
cc47f66e AQ |
1144 | } |
1145 | ||
56303d34 | 1146 | static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 1147 | { |
5bf74e9c | 1148 | struct batadv_hashtable *hash; |
7683fdc1 | 1149 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
56303d34 SE |
1150 | struct batadv_tt_common_entry *tt_common_entry; |
1151 | struct batadv_tt_global_entry *tt_global; | |
7683fdc1 AQ |
1152 | struct hlist_node *node, *node_tmp; |
1153 | struct hlist_head *head; | |
c90681b8 | 1154 | uint32_t i; |
7683fdc1 | 1155 | |
807736f6 | 1156 | if (!bat_priv->tt.global_hash) |
c6c8fea2 SE |
1157 | return; |
1158 | ||
807736f6 | 1159 | hash = bat_priv->tt.global_hash; |
7683fdc1 AQ |
1160 | |
1161 | for (i = 0; i < hash->size; i++) { | |
1162 | head = &hash->table[i]; | |
1163 | list_lock = &hash->list_locks[i]; | |
1164 | ||
1165 | spin_lock_bh(list_lock); | |
48100bac | 1166 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
7683fdc1 AQ |
1167 | head, hash_entry) { |
1168 | hlist_del_rcu(node); | |
56303d34 SE |
1169 | tt_global = container_of(tt_common_entry, |
1170 | struct batadv_tt_global_entry, | |
1171 | common); | |
1172 | batadv_tt_global_entry_free_ref(tt_global); | |
7683fdc1 AQ |
1173 | } |
1174 | spin_unlock_bh(list_lock); | |
1175 | } | |
1176 | ||
1a8eaf07 | 1177 | batadv_hash_destroy(hash); |
7683fdc1 | 1178 | |
807736f6 | 1179 | bat_priv->tt.global_hash = NULL; |
c6c8fea2 SE |
1180 | } |
1181 | ||
56303d34 SE |
1182 | static bool |
1183 | _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry, | |
1184 | struct batadv_tt_global_entry *tt_global_entry) | |
59b699cd AQ |
1185 | { |
1186 | bool ret = false; | |
1187 | ||
acd34afa SE |
1188 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI && |
1189 | tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI) | |
59b699cd AQ |
1190 | ret = true; |
1191 | ||
1192 | return ret; | |
1193 | } | |
1194 | ||
56303d34 SE |
1195 | struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, |
1196 | const uint8_t *src, | |
1197 | const uint8_t *addr) | |
c6c8fea2 | 1198 | { |
56303d34 SE |
1199 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
1200 | struct batadv_tt_global_entry *tt_global_entry = NULL; | |
1201 | struct batadv_orig_node *orig_node = NULL; | |
1202 | struct batadv_neigh_node *router = NULL; | |
db08e6e5 SW |
1203 | struct hlist_head *head; |
1204 | struct hlist_node *node; | |
56303d34 | 1205 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 | 1206 | int best_tq; |
c6c8fea2 | 1207 | |
3d393e47 | 1208 | if (src && atomic_read(&bat_priv->ap_isolation)) { |
a513088d | 1209 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, src); |
3d393e47 AQ |
1210 | if (!tt_local_entry) |
1211 | goto out; | |
1212 | } | |
7aadf889 | 1213 | |
a513088d | 1214 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
2dafb49d | 1215 | if (!tt_global_entry) |
7b36e8ee | 1216 | goto out; |
7aadf889 | 1217 | |
3d393e47 | 1218 | /* check whether the clients should not communicate due to AP |
9cfc7bd6 SE |
1219 | * isolation |
1220 | */ | |
a513088d SE |
1221 | if (tt_local_entry && |
1222 | _batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) | |
3d393e47 AQ |
1223 | goto out; |
1224 | ||
db08e6e5 | 1225 | best_tq = 0; |
c6c8fea2 | 1226 | |
db08e6e5 SW |
1227 | rcu_read_lock(); |
1228 | head = &tt_global_entry->orig_list; | |
1229 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
7d211efc | 1230 | router = batadv_orig_node_get_router(orig_entry->orig_node); |
db08e6e5 SW |
1231 | if (!router) |
1232 | continue; | |
c6c8fea2 | 1233 | |
db08e6e5 SW |
1234 | if (router->tq_avg > best_tq) { |
1235 | orig_node = orig_entry->orig_node; | |
1236 | best_tq = router->tq_avg; | |
1237 | } | |
7d211efc | 1238 | batadv_neigh_node_free_ref(router); |
db08e6e5 SW |
1239 | } |
1240 | /* found anything? */ | |
1241 | if (orig_node && !atomic_inc_not_zero(&orig_node->refcount)) | |
1242 | orig_node = NULL; | |
1243 | rcu_read_unlock(); | |
7b36e8ee | 1244 | out: |
3d393e47 | 1245 | if (tt_global_entry) |
a513088d | 1246 | batadv_tt_global_entry_free_ref(tt_global_entry); |
3d393e47 | 1247 | if (tt_local_entry) |
a513088d | 1248 | batadv_tt_local_entry_free_ref(tt_local_entry); |
3d393e47 | 1249 | |
7b36e8ee | 1250 | return orig_node; |
c6c8fea2 | 1251 | } |
a73105b8 AQ |
1252 | |
1253 | /* Calculates the checksum of the local table of a given orig_node */ | |
56303d34 SE |
1254 | static uint16_t batadv_tt_global_crc(struct batadv_priv *bat_priv, |
1255 | struct batadv_orig_node *orig_node) | |
a73105b8 AQ |
1256 | { |
1257 | uint16_t total = 0, total_one; | |
807736f6 | 1258 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
56303d34 SE |
1259 | struct batadv_tt_common_entry *tt_common; |
1260 | struct batadv_tt_global_entry *tt_global; | |
a73105b8 AQ |
1261 | struct hlist_node *node; |
1262 | struct hlist_head *head; | |
c90681b8 AQ |
1263 | uint32_t i; |
1264 | int j; | |
a73105b8 AQ |
1265 | |
1266 | for (i = 0; i < hash->size; i++) { | |
1267 | head = &hash->table[i]; | |
1268 | ||
1269 | rcu_read_lock(); | |
acd34afa | 1270 | hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) { |
56303d34 SE |
1271 | tt_global = container_of(tt_common, |
1272 | struct batadv_tt_global_entry, | |
1273 | common); | |
db08e6e5 SW |
1274 | /* Roaming clients are in the global table for |
1275 | * consistency only. They don't have to be | |
1276 | * taken into account while computing the | |
1277 | * global crc | |
1278 | */ | |
acd34afa | 1279 | if (tt_common->flags & BATADV_TT_CLIENT_ROAM) |
db08e6e5 | 1280 | continue; |
30cfd02b AQ |
1281 | /* Temporary clients have not been announced yet, so |
1282 | * they have to be skipped while computing the global | |
1283 | * crc | |
1284 | */ | |
1285 | if (tt_common->flags & BATADV_TT_CLIENT_TEMP) | |
1286 | continue; | |
db08e6e5 SW |
1287 | |
1288 | /* find out if this global entry is announced by this | |
1289 | * originator | |
1290 | */ | |
56303d34 | 1291 | if (!batadv_tt_global_entry_has_orig(tt_global, |
a513088d | 1292 | orig_node)) |
db08e6e5 SW |
1293 | continue; |
1294 | ||
1295 | total_one = 0; | |
1296 | for (j = 0; j < ETH_ALEN; j++) | |
1297 | total_one = crc16_byte(total_one, | |
acd34afa | 1298 | tt_common->addr[j]); |
db08e6e5 | 1299 | total ^= total_one; |
a73105b8 AQ |
1300 | } |
1301 | rcu_read_unlock(); | |
1302 | } | |
1303 | ||
1304 | return total; | |
1305 | } | |
1306 | ||
1307 | /* Calculates the checksum of the local table */ | |
56303d34 | 1308 | static uint16_t batadv_tt_local_crc(struct batadv_priv *bat_priv) |
a73105b8 AQ |
1309 | { |
1310 | uint16_t total = 0, total_one; | |
807736f6 | 1311 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
56303d34 | 1312 | struct batadv_tt_common_entry *tt_common; |
a73105b8 AQ |
1313 | struct hlist_node *node; |
1314 | struct hlist_head *head; | |
c90681b8 AQ |
1315 | uint32_t i; |
1316 | int j; | |
a73105b8 AQ |
1317 | |
1318 | for (i = 0; i < hash->size; i++) { | |
1319 | head = &hash->table[i]; | |
1320 | ||
1321 | rcu_read_lock(); | |
acd34afa | 1322 | hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) { |
058d0e26 | 1323 | /* not yet committed clients have not to be taken into |
9cfc7bd6 SE |
1324 | * account while computing the CRC |
1325 | */ | |
acd34afa | 1326 | if (tt_common->flags & BATADV_TT_CLIENT_NEW) |
058d0e26 | 1327 | continue; |
a73105b8 AQ |
1328 | total_one = 0; |
1329 | for (j = 0; j < ETH_ALEN; j++) | |
1330 | total_one = crc16_byte(total_one, | |
acd34afa | 1331 | tt_common->addr[j]); |
a73105b8 AQ |
1332 | total ^= total_one; |
1333 | } | |
a73105b8 AQ |
1334 | rcu_read_unlock(); |
1335 | } | |
1336 | ||
1337 | return total; | |
1338 | } | |
1339 | ||
56303d34 | 1340 | static void batadv_tt_req_list_free(struct batadv_priv *bat_priv) |
a73105b8 | 1341 | { |
56303d34 | 1342 | struct batadv_tt_req_node *node, *safe; |
a73105b8 | 1343 | |
807736f6 | 1344 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 | 1345 | |
807736f6 | 1346 | list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { |
a73105b8 AQ |
1347 | list_del(&node->list); |
1348 | kfree(node); | |
1349 | } | |
1350 | ||
807736f6 | 1351 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1352 | } |
1353 | ||
56303d34 SE |
1354 | static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv, |
1355 | struct batadv_orig_node *orig_node, | |
a513088d SE |
1356 | const unsigned char *tt_buff, |
1357 | uint8_t tt_num_changes) | |
a73105b8 | 1358 | { |
08c36d3e | 1359 | uint16_t tt_buff_len = batadv_tt_len(tt_num_changes); |
a73105b8 AQ |
1360 | |
1361 | /* Replace the old buffer only if I received something in the | |
9cfc7bd6 SE |
1362 | * last OGM (the OGM could carry no changes) |
1363 | */ | |
a73105b8 AQ |
1364 | spin_lock_bh(&orig_node->tt_buff_lock); |
1365 | if (tt_buff_len > 0) { | |
1366 | kfree(orig_node->tt_buff); | |
1367 | orig_node->tt_buff_len = 0; | |
1368 | orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); | |
1369 | if (orig_node->tt_buff) { | |
1370 | memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); | |
1371 | orig_node->tt_buff_len = tt_buff_len; | |
1372 | } | |
1373 | } | |
1374 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1375 | } | |
1376 | ||
56303d34 | 1377 | static void batadv_tt_req_purge(struct batadv_priv *bat_priv) |
a73105b8 | 1378 | { |
56303d34 | 1379 | struct batadv_tt_req_node *node, *safe; |
a73105b8 | 1380 | |
807736f6 SE |
1381 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
1382 | list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { | |
42d0b044 SE |
1383 | if (batadv_has_timed_out(node->issued_at, |
1384 | BATADV_TT_REQUEST_TIMEOUT)) { | |
a73105b8 AQ |
1385 | list_del(&node->list); |
1386 | kfree(node); | |
1387 | } | |
1388 | } | |
807736f6 | 1389 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1390 | } |
1391 | ||
1392 | /* returns the pointer to the new tt_req_node struct if no request | |
9cfc7bd6 SE |
1393 | * has already been issued for this orig_node, NULL otherwise |
1394 | */ | |
56303d34 SE |
1395 | static struct batadv_tt_req_node * |
1396 | batadv_new_tt_req_node(struct batadv_priv *bat_priv, | |
1397 | struct batadv_orig_node *orig_node) | |
a73105b8 | 1398 | { |
56303d34 | 1399 | struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; |
a73105b8 | 1400 | |
807736f6 SE |
1401 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
1402 | list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) { | |
1eda58bf SE |
1403 | if (batadv_compare_eth(tt_req_node_tmp, orig_node) && |
1404 | !batadv_has_timed_out(tt_req_node_tmp->issued_at, | |
42d0b044 | 1405 | BATADV_TT_REQUEST_TIMEOUT)) |
a73105b8 AQ |
1406 | goto unlock; |
1407 | } | |
1408 | ||
1409 | tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); | |
1410 | if (!tt_req_node) | |
1411 | goto unlock; | |
1412 | ||
1413 | memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); | |
1414 | tt_req_node->issued_at = jiffies; | |
1415 | ||
807736f6 | 1416 | list_add(&tt_req_node->list, &bat_priv->tt.req_list); |
a73105b8 | 1417 | unlock: |
807736f6 | 1418 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1419 | return tt_req_node; |
1420 | } | |
1421 | ||
058d0e26 | 1422 | /* data_ptr is useless here, but has to be kept to respect the prototype */ |
a513088d SE |
1423 | static int batadv_tt_local_valid_entry(const void *entry_ptr, |
1424 | const void *data_ptr) | |
058d0e26 | 1425 | { |
56303d34 | 1426 | const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; |
058d0e26 | 1427 | |
acd34afa | 1428 | if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW) |
058d0e26 AQ |
1429 | return 0; |
1430 | return 1; | |
1431 | } | |
1432 | ||
a513088d SE |
1433 | static int batadv_tt_global_valid(const void *entry_ptr, |
1434 | const void *data_ptr) | |
a73105b8 | 1435 | { |
56303d34 SE |
1436 | const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; |
1437 | const struct batadv_tt_global_entry *tt_global_entry; | |
1438 | const struct batadv_orig_node *orig_node = data_ptr; | |
a73105b8 | 1439 | |
30cfd02b AQ |
1440 | if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM || |
1441 | tt_common_entry->flags & BATADV_TT_CLIENT_TEMP) | |
cc47f66e AQ |
1442 | return 0; |
1443 | ||
56303d34 SE |
1444 | tt_global_entry = container_of(tt_common_entry, |
1445 | struct batadv_tt_global_entry, | |
48100bac AQ |
1446 | common); |
1447 | ||
a513088d | 1448 | return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node); |
a73105b8 AQ |
1449 | } |
1450 | ||
a513088d SE |
1451 | static struct sk_buff * |
1452 | batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, | |
5bf74e9c | 1453 | struct batadv_hashtable *hash, |
56303d34 | 1454 | struct batadv_hard_iface *primary_if, |
a513088d SE |
1455 | int (*valid_cb)(const void *, const void *), |
1456 | void *cb_data) | |
a73105b8 | 1457 | { |
56303d34 | 1458 | struct batadv_tt_common_entry *tt_common_entry; |
96412690 SE |
1459 | struct batadv_tt_query_packet *tt_response; |
1460 | struct batadv_tt_change *tt_change; | |
a73105b8 AQ |
1461 | struct hlist_node *node; |
1462 | struct hlist_head *head; | |
1463 | struct sk_buff *skb = NULL; | |
1464 | uint16_t tt_tot, tt_count; | |
96412690 | 1465 | ssize_t tt_query_size = sizeof(struct batadv_tt_query_packet); |
c90681b8 | 1466 | uint32_t i; |
96412690 | 1467 | size_t len; |
a73105b8 AQ |
1468 | |
1469 | if (tt_query_size + tt_len > primary_if->soft_iface->mtu) { | |
1470 | tt_len = primary_if->soft_iface->mtu - tt_query_size; | |
96412690 | 1471 | tt_len -= tt_len % sizeof(struct batadv_tt_change); |
a73105b8 | 1472 | } |
96412690 | 1473 | tt_tot = tt_len / sizeof(struct batadv_tt_change); |
a73105b8 | 1474 | |
96412690 | 1475 | len = tt_query_size + tt_len; |
5b246574 | 1476 | skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN); |
a73105b8 AQ |
1477 | if (!skb) |
1478 | goto out; | |
1479 | ||
5b246574 | 1480 | skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); |
96412690 | 1481 | tt_response = (struct batadv_tt_query_packet *)skb_put(skb, len); |
a73105b8 | 1482 | tt_response->ttvn = ttvn; |
a73105b8 | 1483 | |
96412690 | 1484 | tt_change = (struct batadv_tt_change *)(skb->data + tt_query_size); |
a73105b8 AQ |
1485 | tt_count = 0; |
1486 | ||
1487 | rcu_read_lock(); | |
1488 | for (i = 0; i < hash->size; i++) { | |
1489 | head = &hash->table[i]; | |
1490 | ||
48100bac | 1491 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 AQ |
1492 | head, hash_entry) { |
1493 | if (tt_count == tt_tot) | |
1494 | break; | |
1495 | ||
48100bac | 1496 | if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data))) |
a73105b8 AQ |
1497 | continue; |
1498 | ||
48100bac AQ |
1499 | memcpy(tt_change->addr, tt_common_entry->addr, |
1500 | ETH_ALEN); | |
42d0b044 | 1501 | tt_change->flags = BATADV_NO_FLAGS; |
a73105b8 AQ |
1502 | |
1503 | tt_count++; | |
1504 | tt_change++; | |
1505 | } | |
1506 | } | |
1507 | rcu_read_unlock(); | |
1508 | ||
9d852393 | 1509 | /* store in the message the number of entries we have successfully |
9cfc7bd6 SE |
1510 | * copied |
1511 | */ | |
9d852393 AQ |
1512 | tt_response->tt_data = htons(tt_count); |
1513 | ||
a73105b8 AQ |
1514 | out: |
1515 | return skb; | |
1516 | } | |
1517 | ||
56303d34 SE |
1518 | static int batadv_send_tt_request(struct batadv_priv *bat_priv, |
1519 | struct batadv_orig_node *dst_orig_node, | |
a513088d SE |
1520 | uint8_t ttvn, uint16_t tt_crc, |
1521 | bool full_table) | |
a73105b8 AQ |
1522 | { |
1523 | struct sk_buff *skb = NULL; | |
96412690 | 1524 | struct batadv_tt_query_packet *tt_request; |
56303d34 SE |
1525 | struct batadv_neigh_node *neigh_node = NULL; |
1526 | struct batadv_hard_iface *primary_if; | |
1527 | struct batadv_tt_req_node *tt_req_node = NULL; | |
a73105b8 | 1528 | int ret = 1; |
96412690 | 1529 | size_t tt_req_len; |
a73105b8 | 1530 | |
e5d89254 | 1531 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1532 | if (!primary_if) |
1533 | goto out; | |
1534 | ||
1535 | /* The new tt_req will be issued only if I'm not waiting for a | |
9cfc7bd6 SE |
1536 | * reply from the same orig_node yet |
1537 | */ | |
a513088d | 1538 | tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node); |
a73105b8 AQ |
1539 | if (!tt_req_node) |
1540 | goto out; | |
1541 | ||
5b246574 | 1542 | skb = dev_alloc_skb(sizeof(*tt_request) + ETH_HLEN + NET_IP_ALIGN); |
a73105b8 AQ |
1543 | if (!skb) |
1544 | goto out; | |
1545 | ||
5b246574 | 1546 | skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); |
a73105b8 | 1547 | |
96412690 SE |
1548 | tt_req_len = sizeof(*tt_request); |
1549 | tt_request = (struct batadv_tt_query_packet *)skb_put(skb, tt_req_len); | |
a73105b8 | 1550 | |
acd34afa | 1551 | tt_request->header.packet_type = BATADV_TT_QUERY; |
7e071c79 | 1552 | tt_request->header.version = BATADV_COMPAT_VERSION; |
a73105b8 AQ |
1553 | memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1554 | memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN); | |
42d0b044 | 1555 | tt_request->header.ttl = BATADV_TTL; |
a73105b8 | 1556 | tt_request->ttvn = ttvn; |
6d2003fc | 1557 | tt_request->tt_data = htons(tt_crc); |
acd34afa | 1558 | tt_request->flags = BATADV_TT_REQUEST; |
a73105b8 AQ |
1559 | |
1560 | if (full_table) | |
acd34afa | 1561 | tt_request->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1562 | |
7d211efc | 1563 | neigh_node = batadv_orig_node_get_router(dst_orig_node); |
a73105b8 AQ |
1564 | if (!neigh_node) |
1565 | goto out; | |
1566 | ||
39c75a51 | 1567 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1568 | "Sending TT_REQUEST to %pM via %pM [%c]\n", |
1569 | dst_orig_node->orig, neigh_node->addr, | |
1570 | (full_table ? 'F' : '.')); | |
a73105b8 | 1571 | |
d69909d2 | 1572 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX); |
f8214865 | 1573 | |
9455e34c | 1574 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1575 | ret = 0; |
1576 | ||
1577 | out: | |
1578 | if (neigh_node) | |
7d211efc | 1579 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1580 | if (primary_if) |
e5d89254 | 1581 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1582 | if (ret) |
1583 | kfree_skb(skb); | |
1584 | if (ret && tt_req_node) { | |
807736f6 | 1585 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 | 1586 | list_del(&tt_req_node->list); |
807736f6 | 1587 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1588 | kfree(tt_req_node); |
1589 | } | |
1590 | return ret; | |
1591 | } | |
1592 | ||
96412690 | 1593 | static bool |
56303d34 | 1594 | batadv_send_other_tt_response(struct batadv_priv *bat_priv, |
96412690 | 1595 | struct batadv_tt_query_packet *tt_request) |
a73105b8 | 1596 | { |
56303d34 SE |
1597 | struct batadv_orig_node *req_dst_orig_node = NULL; |
1598 | struct batadv_orig_node *res_dst_orig_node = NULL; | |
1599 | struct batadv_neigh_node *neigh_node = NULL; | |
1600 | struct batadv_hard_iface *primary_if = NULL; | |
a73105b8 AQ |
1601 | uint8_t orig_ttvn, req_ttvn, ttvn; |
1602 | int ret = false; | |
1603 | unsigned char *tt_buff; | |
1604 | bool full_table; | |
1605 | uint16_t tt_len, tt_tot; | |
1606 | struct sk_buff *skb = NULL; | |
96412690 | 1607 | struct batadv_tt_query_packet *tt_response; |
c67893d1 | 1608 | uint8_t *packet_pos; |
96412690 | 1609 | size_t len; |
a73105b8 | 1610 | |
39c75a51 | 1611 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1612 | "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", |
1613 | tt_request->src, tt_request->ttvn, tt_request->dst, | |
acd34afa | 1614 | (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 AQ |
1615 | |
1616 | /* Let's get the orig node of the REAL destination */ | |
da641193 | 1617 | req_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->dst); |
a73105b8 AQ |
1618 | if (!req_dst_orig_node) |
1619 | goto out; | |
1620 | ||
da641193 | 1621 | res_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1622 | if (!res_dst_orig_node) |
1623 | goto out; | |
1624 | ||
7d211efc | 1625 | neigh_node = batadv_orig_node_get_router(res_dst_orig_node); |
a73105b8 AQ |
1626 | if (!neigh_node) |
1627 | goto out; | |
1628 | ||
e5d89254 | 1629 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1630 | if (!primary_if) |
1631 | goto out; | |
1632 | ||
1633 | orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1634 | req_ttvn = tt_request->ttvn; | |
1635 | ||
015758d0 | 1636 | /* I don't have the requested data */ |
a73105b8 | 1637 | if (orig_ttvn != req_ttvn || |
f25bd58a | 1638 | tt_request->tt_data != htons(req_dst_orig_node->tt_crc)) |
a73105b8 AQ |
1639 | goto out; |
1640 | ||
015758d0 | 1641 | /* If the full table has been explicitly requested */ |
acd34afa | 1642 | if (tt_request->flags & BATADV_TT_FULL_TABLE || |
a73105b8 AQ |
1643 | !req_dst_orig_node->tt_buff) |
1644 | full_table = true; | |
1645 | else | |
1646 | full_table = false; | |
1647 | ||
1648 | /* In this version, fragmentation is not implemented, then | |
9cfc7bd6 SE |
1649 | * I'll send only one packet with as much TT entries as I can |
1650 | */ | |
a73105b8 AQ |
1651 | if (!full_table) { |
1652 | spin_lock_bh(&req_dst_orig_node->tt_buff_lock); | |
1653 | tt_len = req_dst_orig_node->tt_buff_len; | |
96412690 | 1654 | tt_tot = tt_len / sizeof(struct batadv_tt_change); |
a73105b8 | 1655 | |
96412690 | 1656 | len = sizeof(*tt_response) + tt_len; |
5b246574 | 1657 | skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN); |
a73105b8 AQ |
1658 | if (!skb) |
1659 | goto unlock; | |
1660 | ||
5b246574 | 1661 | skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); |
c67893d1 SE |
1662 | packet_pos = skb_put(skb, len); |
1663 | tt_response = (struct batadv_tt_query_packet *)packet_pos; | |
a73105b8 AQ |
1664 | tt_response->ttvn = req_ttvn; |
1665 | tt_response->tt_data = htons(tt_tot); | |
1666 | ||
96412690 | 1667 | tt_buff = skb->data + sizeof(*tt_response); |
a73105b8 AQ |
1668 | /* Copy the last orig_node's OGM buffer */ |
1669 | memcpy(tt_buff, req_dst_orig_node->tt_buff, | |
1670 | req_dst_orig_node->tt_buff_len); | |
1671 | ||
1672 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1673 | } else { | |
96412690 SE |
1674 | tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size); |
1675 | tt_len *= sizeof(struct batadv_tt_change); | |
a73105b8 AQ |
1676 | ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); |
1677 | ||
a513088d | 1678 | skb = batadv_tt_response_fill_table(tt_len, ttvn, |
807736f6 | 1679 | bat_priv->tt.global_hash, |
a513088d SE |
1680 | primary_if, |
1681 | batadv_tt_global_valid, | |
1682 | req_dst_orig_node); | |
a73105b8 AQ |
1683 | if (!skb) |
1684 | goto out; | |
1685 | ||
96412690 | 1686 | tt_response = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 AQ |
1687 | } |
1688 | ||
acd34afa | 1689 | tt_response->header.packet_type = BATADV_TT_QUERY; |
7e071c79 | 1690 | tt_response->header.version = BATADV_COMPAT_VERSION; |
42d0b044 | 1691 | tt_response->header.ttl = BATADV_TTL; |
a73105b8 AQ |
1692 | memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN); |
1693 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
acd34afa | 1694 | tt_response->flags = BATADV_TT_RESPONSE; |
a73105b8 AQ |
1695 | |
1696 | if (full_table) | |
acd34afa | 1697 | tt_response->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1698 | |
39c75a51 | 1699 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1700 | "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n", |
1701 | res_dst_orig_node->orig, neigh_node->addr, | |
1702 | req_dst_orig_node->orig, req_ttvn); | |
a73105b8 | 1703 | |
d69909d2 | 1704 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); |
f8214865 | 1705 | |
9455e34c | 1706 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1707 | ret = true; |
1708 | goto out; | |
1709 | ||
1710 | unlock: | |
1711 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1712 | ||
1713 | out: | |
1714 | if (res_dst_orig_node) | |
7d211efc | 1715 | batadv_orig_node_free_ref(res_dst_orig_node); |
a73105b8 | 1716 | if (req_dst_orig_node) |
7d211efc | 1717 | batadv_orig_node_free_ref(req_dst_orig_node); |
a73105b8 | 1718 | if (neigh_node) |
7d211efc | 1719 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1720 | if (primary_if) |
e5d89254 | 1721 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1722 | if (!ret) |
1723 | kfree_skb(skb); | |
1724 | return ret; | |
1725 | ||
1726 | } | |
96412690 SE |
1727 | |
1728 | static bool | |
56303d34 | 1729 | batadv_send_my_tt_response(struct batadv_priv *bat_priv, |
96412690 | 1730 | struct batadv_tt_query_packet *tt_request) |
a73105b8 | 1731 | { |
56303d34 SE |
1732 | struct batadv_orig_node *orig_node = NULL; |
1733 | struct batadv_neigh_node *neigh_node = NULL; | |
1734 | struct batadv_hard_iface *primary_if = NULL; | |
a73105b8 AQ |
1735 | uint8_t my_ttvn, req_ttvn, ttvn; |
1736 | int ret = false; | |
1737 | unsigned char *tt_buff; | |
1738 | bool full_table; | |
1739 | uint16_t tt_len, tt_tot; | |
1740 | struct sk_buff *skb = NULL; | |
96412690 | 1741 | struct batadv_tt_query_packet *tt_response; |
c67893d1 | 1742 | uint8_t *packet_pos; |
96412690 | 1743 | size_t len; |
a73105b8 | 1744 | |
39c75a51 | 1745 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1746 | "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", |
1747 | tt_request->src, tt_request->ttvn, | |
acd34afa | 1748 | (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 AQ |
1749 | |
1750 | ||
807736f6 | 1751 | my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); |
a73105b8 AQ |
1752 | req_ttvn = tt_request->ttvn; |
1753 | ||
da641193 | 1754 | orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1755 | if (!orig_node) |
1756 | goto out; | |
1757 | ||
7d211efc | 1758 | neigh_node = batadv_orig_node_get_router(orig_node); |
a73105b8 AQ |
1759 | if (!neigh_node) |
1760 | goto out; | |
1761 | ||
e5d89254 | 1762 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1763 | if (!primary_if) |
1764 | goto out; | |
1765 | ||
1766 | /* If the full table has been explicitly requested or the gap | |
9cfc7bd6 SE |
1767 | * is too big send the whole local translation table |
1768 | */ | |
acd34afa | 1769 | if (tt_request->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn || |
807736f6 | 1770 | !bat_priv->tt.last_changeset) |
a73105b8 AQ |
1771 | full_table = true; |
1772 | else | |
1773 | full_table = false; | |
1774 | ||
1775 | /* In this version, fragmentation is not implemented, then | |
9cfc7bd6 SE |
1776 | * I'll send only one packet with as much TT entries as I can |
1777 | */ | |
a73105b8 | 1778 | if (!full_table) { |
807736f6 SE |
1779 | spin_lock_bh(&bat_priv->tt.last_changeset_lock); |
1780 | tt_len = bat_priv->tt.last_changeset_len; | |
96412690 | 1781 | tt_tot = tt_len / sizeof(struct batadv_tt_change); |
a73105b8 | 1782 | |
96412690 | 1783 | len = sizeof(*tt_response) + tt_len; |
5b246574 | 1784 | skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN); |
a73105b8 AQ |
1785 | if (!skb) |
1786 | goto unlock; | |
1787 | ||
5b246574 | 1788 | skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); |
c67893d1 SE |
1789 | packet_pos = skb_put(skb, len); |
1790 | tt_response = (struct batadv_tt_query_packet *)packet_pos; | |
a73105b8 AQ |
1791 | tt_response->ttvn = req_ttvn; |
1792 | tt_response->tt_data = htons(tt_tot); | |
1793 | ||
96412690 | 1794 | tt_buff = skb->data + sizeof(*tt_response); |
807736f6 SE |
1795 | memcpy(tt_buff, bat_priv->tt.last_changeset, |
1796 | bat_priv->tt.last_changeset_len); | |
1797 | spin_unlock_bh(&bat_priv->tt.last_changeset_lock); | |
a73105b8 | 1798 | } else { |
807736f6 | 1799 | tt_len = (uint16_t)atomic_read(&bat_priv->tt.local_entry_num); |
96412690 | 1800 | tt_len *= sizeof(struct batadv_tt_change); |
807736f6 | 1801 | ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); |
a73105b8 | 1802 | |
a513088d | 1803 | skb = batadv_tt_response_fill_table(tt_len, ttvn, |
807736f6 | 1804 | bat_priv->tt.local_hash, |
a513088d SE |
1805 | primary_if, |
1806 | batadv_tt_local_valid_entry, | |
1807 | NULL); | |
a73105b8 AQ |
1808 | if (!skb) |
1809 | goto out; | |
1810 | ||
96412690 | 1811 | tt_response = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 AQ |
1812 | } |
1813 | ||
acd34afa | 1814 | tt_response->header.packet_type = BATADV_TT_QUERY; |
7e071c79 | 1815 | tt_response->header.version = BATADV_COMPAT_VERSION; |
42d0b044 | 1816 | tt_response->header.ttl = BATADV_TTL; |
a73105b8 AQ |
1817 | memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1818 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
acd34afa | 1819 | tt_response->flags = BATADV_TT_RESPONSE; |
a73105b8 AQ |
1820 | |
1821 | if (full_table) | |
acd34afa | 1822 | tt_response->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1823 | |
39c75a51 | 1824 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1825 | "Sending TT_RESPONSE to %pM via %pM [%c]\n", |
1826 | orig_node->orig, neigh_node->addr, | |
acd34afa | 1827 | (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 | 1828 | |
d69909d2 | 1829 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); |
f8214865 | 1830 | |
9455e34c | 1831 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1832 | ret = true; |
1833 | goto out; | |
1834 | ||
1835 | unlock: | |
807736f6 | 1836 | spin_unlock_bh(&bat_priv->tt.last_changeset_lock); |
a73105b8 AQ |
1837 | out: |
1838 | if (orig_node) | |
7d211efc | 1839 | batadv_orig_node_free_ref(orig_node); |
a73105b8 | 1840 | if (neigh_node) |
7d211efc | 1841 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1842 | if (primary_if) |
e5d89254 | 1843 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1844 | if (!ret) |
1845 | kfree_skb(skb); | |
1846 | /* This packet was for me, so it doesn't need to be re-routed */ | |
1847 | return true; | |
1848 | } | |
1849 | ||
56303d34 | 1850 | bool batadv_send_tt_response(struct batadv_priv *bat_priv, |
96412690 | 1851 | struct batadv_tt_query_packet *tt_request) |
a73105b8 | 1852 | { |
3193e8fd | 1853 | if (batadv_is_my_mac(tt_request->dst)) { |
20ff9d59 | 1854 | /* don't answer backbone gws! */ |
08adf151 | 1855 | if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src)) |
20ff9d59 SW |
1856 | return true; |
1857 | ||
a513088d | 1858 | return batadv_send_my_tt_response(bat_priv, tt_request); |
20ff9d59 | 1859 | } else { |
a513088d | 1860 | return batadv_send_other_tt_response(bat_priv, tt_request); |
20ff9d59 | 1861 | } |
a73105b8 AQ |
1862 | } |
1863 | ||
56303d34 SE |
1864 | static void _batadv_tt_update_changes(struct batadv_priv *bat_priv, |
1865 | struct batadv_orig_node *orig_node, | |
96412690 | 1866 | struct batadv_tt_change *tt_change, |
a513088d | 1867 | uint16_t tt_num_changes, uint8_t ttvn) |
a73105b8 AQ |
1868 | { |
1869 | int i; | |
a513088d | 1870 | int roams; |
a73105b8 AQ |
1871 | |
1872 | for (i = 0; i < tt_num_changes; i++) { | |
acd34afa SE |
1873 | if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) { |
1874 | roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM; | |
a513088d SE |
1875 | batadv_tt_global_del(bat_priv, orig_node, |
1876 | (tt_change + i)->addr, | |
d4f44692 AQ |
1877 | "tt removed by changes", |
1878 | roams); | |
08c36d3e | 1879 | } else { |
08c36d3e | 1880 | if (!batadv_tt_global_add(bat_priv, orig_node, |
d4f44692 AQ |
1881 | (tt_change + i)->addr, |
1882 | (tt_change + i)->flags, ttvn)) | |
a73105b8 AQ |
1883 | /* In case of problem while storing a |
1884 | * global_entry, we stop the updating | |
1885 | * procedure without committing the | |
1886 | * ttvn change. This will avoid to send | |
1887 | * corrupted data on tt_request | |
1888 | */ | |
1889 | return; | |
08c36d3e | 1890 | } |
a73105b8 | 1891 | } |
17071578 | 1892 | orig_node->tt_initialised = true; |
a73105b8 AQ |
1893 | } |
1894 | ||
56303d34 | 1895 | static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv, |
96412690 | 1896 | struct batadv_tt_query_packet *tt_response) |
a73105b8 | 1897 | { |
56303d34 | 1898 | struct batadv_orig_node *orig_node = NULL; |
a73105b8 | 1899 | |
da641193 | 1900 | orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); |
a73105b8 AQ |
1901 | if (!orig_node) |
1902 | goto out; | |
1903 | ||
1904 | /* Purge the old table first.. */ | |
08c36d3e | 1905 | batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table"); |
a73105b8 | 1906 | |
a513088d | 1907 | _batadv_tt_update_changes(bat_priv, orig_node, |
96412690 | 1908 | (struct batadv_tt_change *)(tt_response + 1), |
a513088d SE |
1909 | ntohs(tt_response->tt_data), |
1910 | tt_response->ttvn); | |
a73105b8 AQ |
1911 | |
1912 | spin_lock_bh(&orig_node->tt_buff_lock); | |
1913 | kfree(orig_node->tt_buff); | |
1914 | orig_node->tt_buff_len = 0; | |
1915 | orig_node->tt_buff = NULL; | |
1916 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1917 | ||
1918 | atomic_set(&orig_node->last_ttvn, tt_response->ttvn); | |
1919 | ||
1920 | out: | |
1921 | if (orig_node) | |
7d211efc | 1922 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
1923 | } |
1924 | ||
56303d34 SE |
1925 | static void batadv_tt_update_changes(struct batadv_priv *bat_priv, |
1926 | struct batadv_orig_node *orig_node, | |
a513088d | 1927 | uint16_t tt_num_changes, uint8_t ttvn, |
96412690 | 1928 | struct batadv_tt_change *tt_change) |
a73105b8 | 1929 | { |
a513088d SE |
1930 | _batadv_tt_update_changes(bat_priv, orig_node, tt_change, |
1931 | tt_num_changes, ttvn); | |
a73105b8 | 1932 | |
a513088d SE |
1933 | batadv_tt_save_orig_buffer(bat_priv, orig_node, |
1934 | (unsigned char *)tt_change, tt_num_changes); | |
a73105b8 AQ |
1935 | atomic_set(&orig_node->last_ttvn, ttvn); |
1936 | } | |
1937 | ||
56303d34 | 1938 | bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr) |
a73105b8 | 1939 | { |
56303d34 | 1940 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
7683fdc1 | 1941 | bool ret = false; |
a73105b8 | 1942 | |
a513088d | 1943 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
1944 | if (!tt_local_entry) |
1945 | goto out; | |
058d0e26 | 1946 | /* Check if the client has been logically deleted (but is kept for |
9cfc7bd6 SE |
1947 | * consistency purpose) |
1948 | */ | |
7c1fd91d AQ |
1949 | if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) || |
1950 | (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM)) | |
058d0e26 | 1951 | goto out; |
7683fdc1 AQ |
1952 | ret = true; |
1953 | out: | |
a73105b8 | 1954 | if (tt_local_entry) |
a513088d | 1955 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7683fdc1 | 1956 | return ret; |
a73105b8 AQ |
1957 | } |
1958 | ||
56303d34 | 1959 | void batadv_handle_tt_response(struct batadv_priv *bat_priv, |
96412690 | 1960 | struct batadv_tt_query_packet *tt_response) |
a73105b8 | 1961 | { |
56303d34 SE |
1962 | struct batadv_tt_req_node *node, *safe; |
1963 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1964 | struct batadv_tt_change *tt_change; |
a73105b8 | 1965 | |
39c75a51 | 1966 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1967 | "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", |
1968 | tt_response->src, tt_response->ttvn, | |
1969 | ntohs(tt_response->tt_data), | |
acd34afa | 1970 | (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 | 1971 | |
20ff9d59 | 1972 | /* we should have never asked a backbone gw */ |
08adf151 | 1973 | if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src)) |
20ff9d59 SW |
1974 | goto out; |
1975 | ||
da641193 | 1976 | orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); |
a73105b8 AQ |
1977 | if (!orig_node) |
1978 | goto out; | |
1979 | ||
96412690 | 1980 | if (tt_response->flags & BATADV_TT_FULL_TABLE) { |
a513088d | 1981 | batadv_tt_fill_gtable(bat_priv, tt_response); |
96412690 SE |
1982 | } else { |
1983 | tt_change = (struct batadv_tt_change *)(tt_response + 1); | |
a513088d SE |
1984 | batadv_tt_update_changes(bat_priv, orig_node, |
1985 | ntohs(tt_response->tt_data), | |
96412690 SE |
1986 | tt_response->ttvn, tt_change); |
1987 | } | |
a73105b8 AQ |
1988 | |
1989 | /* Delete the tt_req_node from pending tt_requests list */ | |
807736f6 SE |
1990 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
1991 | list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { | |
1eda58bf | 1992 | if (!batadv_compare_eth(node->addr, tt_response->src)) |
a73105b8 AQ |
1993 | continue; |
1994 | list_del(&node->list); | |
1995 | kfree(node); | |
1996 | } | |
807736f6 | 1997 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1998 | |
1999 | /* Recalculate the CRC for this orig_node and store it */ | |
a513088d | 2000 | orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); |
a73105b8 AQ |
2001 | out: |
2002 | if (orig_node) | |
7d211efc | 2003 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
2004 | } |
2005 | ||
56303d34 | 2006 | int batadv_tt_init(struct batadv_priv *bat_priv) |
a73105b8 | 2007 | { |
5346c35e | 2008 | int ret; |
a73105b8 | 2009 | |
a513088d | 2010 | ret = batadv_tt_local_init(bat_priv); |
5346c35e SE |
2011 | if (ret < 0) |
2012 | return ret; | |
2013 | ||
a513088d | 2014 | ret = batadv_tt_global_init(bat_priv); |
5346c35e SE |
2015 | if (ret < 0) |
2016 | return ret; | |
a73105b8 | 2017 | |
a513088d | 2018 | batadv_tt_start_timer(bat_priv); |
a73105b8 AQ |
2019 | |
2020 | return 1; | |
2021 | } | |
2022 | ||
56303d34 | 2023 | static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv) |
a73105b8 | 2024 | { |
56303d34 | 2025 | struct batadv_tt_roam_node *node, *safe; |
a73105b8 | 2026 | |
807736f6 | 2027 | spin_lock_bh(&bat_priv->tt.roam_list_lock); |
a73105b8 | 2028 | |
807736f6 | 2029 | list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { |
cc47f66e AQ |
2030 | list_del(&node->list); |
2031 | kfree(node); | |
2032 | } | |
2033 | ||
807736f6 | 2034 | spin_unlock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e AQ |
2035 | } |
2036 | ||
56303d34 | 2037 | static void batadv_tt_roam_purge(struct batadv_priv *bat_priv) |
cc47f66e | 2038 | { |
56303d34 | 2039 | struct batadv_tt_roam_node *node, *safe; |
cc47f66e | 2040 | |
807736f6 SE |
2041 | spin_lock_bh(&bat_priv->tt.roam_list_lock); |
2042 | list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { | |
42d0b044 SE |
2043 | if (!batadv_has_timed_out(node->first_time, |
2044 | BATADV_ROAMING_MAX_TIME)) | |
cc47f66e AQ |
2045 | continue; |
2046 | ||
2047 | list_del(&node->list); | |
2048 | kfree(node); | |
2049 | } | |
807736f6 | 2050 | spin_unlock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e AQ |
2051 | } |
2052 | ||
2053 | /* This function checks whether the client already reached the | |
2054 | * maximum number of possible roaming phases. In this case the ROAMING_ADV | |
2055 | * will not be sent. | |
2056 | * | |
9cfc7bd6 SE |
2057 | * returns true if the ROAMING_ADV can be sent, false otherwise |
2058 | */ | |
56303d34 | 2059 | static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, |
a513088d | 2060 | uint8_t *client) |
cc47f66e | 2061 | { |
56303d34 | 2062 | struct batadv_tt_roam_node *tt_roam_node; |
cc47f66e AQ |
2063 | bool ret = false; |
2064 | ||
807736f6 | 2065 | spin_lock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e | 2066 | /* The new tt_req will be issued only if I'm not waiting for a |
9cfc7bd6 SE |
2067 | * reply from the same orig_node yet |
2068 | */ | |
807736f6 | 2069 | list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) { |
1eda58bf | 2070 | if (!batadv_compare_eth(tt_roam_node->addr, client)) |
cc47f66e AQ |
2071 | continue; |
2072 | ||
1eda58bf | 2073 | if (batadv_has_timed_out(tt_roam_node->first_time, |
42d0b044 | 2074 | BATADV_ROAMING_MAX_TIME)) |
cc47f66e AQ |
2075 | continue; |
2076 | ||
3e34819e | 2077 | if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter)) |
cc47f66e AQ |
2078 | /* Sorry, you roamed too many times! */ |
2079 | goto unlock; | |
2080 | ret = true; | |
2081 | break; | |
2082 | } | |
2083 | ||
2084 | if (!ret) { | |
2085 | tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); | |
2086 | if (!tt_roam_node) | |
2087 | goto unlock; | |
2088 | ||
2089 | tt_roam_node->first_time = jiffies; | |
42d0b044 SE |
2090 | atomic_set(&tt_roam_node->counter, |
2091 | BATADV_ROAMING_MAX_COUNT - 1); | |
cc47f66e AQ |
2092 | memcpy(tt_roam_node->addr, client, ETH_ALEN); |
2093 | ||
807736f6 | 2094 | list_add(&tt_roam_node->list, &bat_priv->tt.roam_list); |
cc47f66e AQ |
2095 | ret = true; |
2096 | } | |
2097 | ||
2098 | unlock: | |
807736f6 | 2099 | spin_unlock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e AQ |
2100 | return ret; |
2101 | } | |
2102 | ||
56303d34 SE |
2103 | static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, |
2104 | struct batadv_orig_node *orig_node) | |
cc47f66e | 2105 | { |
56303d34 | 2106 | struct batadv_neigh_node *neigh_node = NULL; |
cc47f66e | 2107 | struct sk_buff *skb = NULL; |
96412690 | 2108 | struct batadv_roam_adv_packet *roam_adv_packet; |
cc47f66e | 2109 | int ret = 1; |
56303d34 | 2110 | struct batadv_hard_iface *primary_if; |
96412690 | 2111 | size_t len = sizeof(*roam_adv_packet); |
cc47f66e AQ |
2112 | |
2113 | /* before going on we have to check whether the client has | |
9cfc7bd6 SE |
2114 | * already roamed to us too many times |
2115 | */ | |
a513088d | 2116 | if (!batadv_tt_check_roam_count(bat_priv, client)) |
cc47f66e AQ |
2117 | goto out; |
2118 | ||
5b246574 | 2119 | skb = dev_alloc_skb(sizeof(*roam_adv_packet) + ETH_HLEN + NET_IP_ALIGN); |
cc47f66e AQ |
2120 | if (!skb) |
2121 | goto out; | |
2122 | ||
5b246574 | 2123 | skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); |
cc47f66e | 2124 | |
96412690 | 2125 | roam_adv_packet = (struct batadv_roam_adv_packet *)skb_put(skb, len); |
cc47f66e | 2126 | |
acd34afa | 2127 | roam_adv_packet->header.packet_type = BATADV_ROAM_ADV; |
7e071c79 | 2128 | roam_adv_packet->header.version = BATADV_COMPAT_VERSION; |
42d0b044 | 2129 | roam_adv_packet->header.ttl = BATADV_TTL; |
162d549c | 2130 | roam_adv_packet->reserved = 0; |
e5d89254 | 2131 | primary_if = batadv_primary_if_get_selected(bat_priv); |
cc47f66e AQ |
2132 | if (!primary_if) |
2133 | goto out; | |
2134 | memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN); | |
e5d89254 | 2135 | batadv_hardif_free_ref(primary_if); |
cc47f66e AQ |
2136 | memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN); |
2137 | memcpy(roam_adv_packet->client, client, ETH_ALEN); | |
2138 | ||
7d211efc | 2139 | neigh_node = batadv_orig_node_get_router(orig_node); |
cc47f66e AQ |
2140 | if (!neigh_node) |
2141 | goto out; | |
2142 | ||
39c75a51 | 2143 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
2144 | "Sending ROAMING_ADV to %pM (client %pM) via %pM\n", |
2145 | orig_node->orig, client, neigh_node->addr); | |
cc47f66e | 2146 | |
d69909d2 | 2147 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX); |
f8214865 | 2148 | |
9455e34c | 2149 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
cc47f66e AQ |
2150 | ret = 0; |
2151 | ||
2152 | out: | |
2153 | if (neigh_node) | |
7d211efc | 2154 | batadv_neigh_node_free_ref(neigh_node); |
cc47f66e AQ |
2155 | if (ret) |
2156 | kfree_skb(skb); | |
2157 | return; | |
a73105b8 AQ |
2158 | } |
2159 | ||
a513088d | 2160 | static void batadv_tt_purge(struct work_struct *work) |
a73105b8 | 2161 | { |
56303d34 | 2162 | struct delayed_work *delayed_work; |
807736f6 | 2163 | struct batadv_priv_tt *priv_tt; |
56303d34 SE |
2164 | struct batadv_priv *bat_priv; |
2165 | ||
2166 | delayed_work = container_of(work, struct delayed_work, work); | |
807736f6 SE |
2167 | priv_tt = container_of(delayed_work, struct batadv_priv_tt, work); |
2168 | bat_priv = container_of(priv_tt, struct batadv_priv, tt); | |
a73105b8 | 2169 | |
a513088d | 2170 | batadv_tt_local_purge(bat_priv); |
30cfd02b | 2171 | batadv_tt_global_purge(bat_priv); |
a513088d SE |
2172 | batadv_tt_req_purge(bat_priv); |
2173 | batadv_tt_roam_purge(bat_priv); | |
a73105b8 | 2174 | |
a513088d | 2175 | batadv_tt_start_timer(bat_priv); |
a73105b8 | 2176 | } |
cc47f66e | 2177 | |
56303d34 | 2178 | void batadv_tt_free(struct batadv_priv *bat_priv) |
cc47f66e | 2179 | { |
807736f6 | 2180 | cancel_delayed_work_sync(&bat_priv->tt.work); |
cc47f66e | 2181 | |
a513088d SE |
2182 | batadv_tt_local_table_free(bat_priv); |
2183 | batadv_tt_global_table_free(bat_priv); | |
2184 | batadv_tt_req_list_free(bat_priv); | |
2185 | batadv_tt_changes_list_free(bat_priv); | |
2186 | batadv_tt_roam_list_free(bat_priv); | |
cc47f66e | 2187 | |
807736f6 | 2188 | kfree(bat_priv->tt.last_changeset); |
cc47f66e | 2189 | } |
058d0e26 | 2190 | |
697f2531 | 2191 | /* This function will enable or disable the specified flags for all the entries |
9cfc7bd6 SE |
2192 | * in the given hash table and returns the number of modified entries |
2193 | */ | |
5bf74e9c SE |
2194 | static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash, |
2195 | uint16_t flags, bool enable) | |
058d0e26 | 2196 | { |
c90681b8 | 2197 | uint32_t i; |
697f2531 | 2198 | uint16_t changed_num = 0; |
058d0e26 AQ |
2199 | struct hlist_head *head; |
2200 | struct hlist_node *node; | |
56303d34 | 2201 | struct batadv_tt_common_entry *tt_common_entry; |
058d0e26 AQ |
2202 | |
2203 | if (!hash) | |
697f2531 | 2204 | goto out; |
058d0e26 AQ |
2205 | |
2206 | for (i = 0; i < hash->size; i++) { | |
2207 | head = &hash->table[i]; | |
2208 | ||
2209 | rcu_read_lock(); | |
48100bac | 2210 | hlist_for_each_entry_rcu(tt_common_entry, node, |
058d0e26 | 2211 | head, hash_entry) { |
697f2531 AQ |
2212 | if (enable) { |
2213 | if ((tt_common_entry->flags & flags) == flags) | |
2214 | continue; | |
2215 | tt_common_entry->flags |= flags; | |
2216 | } else { | |
2217 | if (!(tt_common_entry->flags & flags)) | |
2218 | continue; | |
2219 | tt_common_entry->flags &= ~flags; | |
2220 | } | |
2221 | changed_num++; | |
058d0e26 AQ |
2222 | } |
2223 | rcu_read_unlock(); | |
2224 | } | |
697f2531 AQ |
2225 | out: |
2226 | return changed_num; | |
058d0e26 AQ |
2227 | } |
2228 | ||
acd34afa | 2229 | /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */ |
56303d34 | 2230 | static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) |
058d0e26 | 2231 | { |
807736f6 | 2232 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
56303d34 SE |
2233 | struct batadv_tt_common_entry *tt_common; |
2234 | struct batadv_tt_local_entry *tt_local; | |
058d0e26 AQ |
2235 | struct hlist_node *node, *node_tmp; |
2236 | struct hlist_head *head; | |
2237 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
c90681b8 | 2238 | uint32_t i; |
058d0e26 AQ |
2239 | |
2240 | if (!hash) | |
2241 | return; | |
2242 | ||
2243 | for (i = 0; i < hash->size; i++) { | |
2244 | head = &hash->table[i]; | |
2245 | list_lock = &hash->list_locks[i]; | |
2246 | ||
2247 | spin_lock_bh(list_lock); | |
acd34afa SE |
2248 | hlist_for_each_entry_safe(tt_common, node, node_tmp, head, |
2249 | hash_entry) { | |
2250 | if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING)) | |
058d0e26 AQ |
2251 | continue; |
2252 | ||
39c75a51 | 2253 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 2254 | "Deleting local tt entry (%pM): pending\n", |
acd34afa | 2255 | tt_common->addr); |
058d0e26 | 2256 | |
807736f6 | 2257 | atomic_dec(&bat_priv->tt.local_entry_num); |
058d0e26 | 2258 | hlist_del_rcu(node); |
56303d34 SE |
2259 | tt_local = container_of(tt_common, |
2260 | struct batadv_tt_local_entry, | |
2261 | common); | |
2262 | batadv_tt_local_entry_free_ref(tt_local); | |
058d0e26 AQ |
2263 | } |
2264 | spin_unlock_bh(list_lock); | |
2265 | } | |
2266 | ||
2267 | } | |
2268 | ||
56303d34 | 2269 | static int batadv_tt_commit_changes(struct batadv_priv *bat_priv, |
a513088d SE |
2270 | unsigned char **packet_buff, |
2271 | int *packet_buff_len, int packet_min_len) | |
058d0e26 | 2272 | { |
be9aa4c1 ML |
2273 | uint16_t changed_num = 0; |
2274 | ||
807736f6 | 2275 | if (atomic_read(&bat_priv->tt.local_changes) < 1) |
be9aa4c1 ML |
2276 | return -ENOENT; |
2277 | ||
807736f6 | 2278 | changed_num = batadv_tt_set_flags(bat_priv->tt.local_hash, |
acd34afa | 2279 | BATADV_TT_CLIENT_NEW, false); |
be9aa4c1 ML |
2280 | |
2281 | /* all reset entries have to be counted as local entries */ | |
807736f6 | 2282 | atomic_add(changed_num, &bat_priv->tt.local_entry_num); |
a513088d | 2283 | batadv_tt_local_purge_pending_clients(bat_priv); |
807736f6 | 2284 | bat_priv->tt.local_crc = batadv_tt_local_crc(bat_priv); |
058d0e26 AQ |
2285 | |
2286 | /* Increment the TTVN only once per OGM interval */ | |
807736f6 | 2287 | atomic_inc(&bat_priv->tt.vn); |
39c75a51 | 2288 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 2289 | "Local changes committed, updating to ttvn %u\n", |
807736f6 | 2290 | (uint8_t)atomic_read(&bat_priv->tt.vn)); |
be9aa4c1 ML |
2291 | |
2292 | /* reset the sending counter */ | |
807736f6 | 2293 | atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX); |
be9aa4c1 | 2294 | |
a513088d SE |
2295 | return batadv_tt_changes_fill_buff(bat_priv, packet_buff, |
2296 | packet_buff_len, packet_min_len); | |
be9aa4c1 ML |
2297 | } |
2298 | ||
2299 | /* when calling this function (hard_iface == primary_if) has to be true */ | |
56303d34 | 2300 | int batadv_tt_append_diff(struct batadv_priv *bat_priv, |
be9aa4c1 ML |
2301 | unsigned char **packet_buff, int *packet_buff_len, |
2302 | int packet_min_len) | |
2303 | { | |
2304 | int tt_num_changes; | |
2305 | ||
2306 | /* if at least one change happened */ | |
a513088d SE |
2307 | tt_num_changes = batadv_tt_commit_changes(bat_priv, packet_buff, |
2308 | packet_buff_len, | |
2309 | packet_min_len); | |
be9aa4c1 ML |
2310 | |
2311 | /* if the changes have been sent often enough */ | |
2312 | if ((tt_num_changes < 0) && | |
807736f6 | 2313 | (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))) { |
a513088d SE |
2314 | batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, |
2315 | packet_min_len, packet_min_len); | |
be9aa4c1 ML |
2316 | tt_num_changes = 0; |
2317 | } | |
2318 | ||
2319 | return tt_num_changes; | |
058d0e26 | 2320 | } |
59b699cd | 2321 | |
56303d34 | 2322 | bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src, |
08c36d3e | 2323 | uint8_t *dst) |
59b699cd | 2324 | { |
56303d34 SE |
2325 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
2326 | struct batadv_tt_global_entry *tt_global_entry = NULL; | |
5870adc6 | 2327 | bool ret = false; |
59b699cd AQ |
2328 | |
2329 | if (!atomic_read(&bat_priv->ap_isolation)) | |
5870adc6 | 2330 | goto out; |
59b699cd | 2331 | |
a513088d | 2332 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst); |
59b699cd AQ |
2333 | if (!tt_local_entry) |
2334 | goto out; | |
2335 | ||
a513088d | 2336 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, src); |
59b699cd AQ |
2337 | if (!tt_global_entry) |
2338 | goto out; | |
2339 | ||
1f129fef | 2340 | if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) |
59b699cd AQ |
2341 | goto out; |
2342 | ||
5870adc6 | 2343 | ret = true; |
59b699cd AQ |
2344 | |
2345 | out: | |
2346 | if (tt_global_entry) | |
a513088d | 2347 | batadv_tt_global_entry_free_ref(tt_global_entry); |
59b699cd | 2348 | if (tt_local_entry) |
a513088d | 2349 | batadv_tt_local_entry_free_ref(tt_local_entry); |
59b699cd AQ |
2350 | return ret; |
2351 | } | |
a943cac1 | 2352 | |
56303d34 SE |
2353 | void batadv_tt_update_orig(struct batadv_priv *bat_priv, |
2354 | struct batadv_orig_node *orig_node, | |
08c36d3e SE |
2355 | const unsigned char *tt_buff, uint8_t tt_num_changes, |
2356 | uint8_t ttvn, uint16_t tt_crc) | |
a943cac1 ML |
2357 | { |
2358 | uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
2359 | bool full_table = true; | |
96412690 | 2360 | struct batadv_tt_change *tt_change; |
a943cac1 | 2361 | |
20ff9d59 | 2362 | /* don't care about a backbone gateways updates. */ |
08adf151 | 2363 | if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) |
20ff9d59 SW |
2364 | return; |
2365 | ||
17071578 | 2366 | /* orig table not initialised AND first diff is in the OGM OR the ttvn |
9cfc7bd6 SE |
2367 | * increased by one -> we can apply the attached changes |
2368 | */ | |
17071578 AQ |
2369 | if ((!orig_node->tt_initialised && ttvn == 1) || |
2370 | ttvn - orig_ttvn == 1) { | |
a943cac1 | 2371 | /* the OGM could not contain the changes due to their size or |
42d0b044 SE |
2372 | * because they have already been sent BATADV_TT_OGM_APPEND_MAX |
2373 | * times. | |
9cfc7bd6 SE |
2374 | * In this case send a tt request |
2375 | */ | |
a943cac1 ML |
2376 | if (!tt_num_changes) { |
2377 | full_table = false; | |
2378 | goto request_table; | |
2379 | } | |
2380 | ||
96412690 | 2381 | tt_change = (struct batadv_tt_change *)tt_buff; |
a513088d | 2382 | batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes, |
96412690 | 2383 | ttvn, tt_change); |
a943cac1 ML |
2384 | |
2385 | /* Even if we received the precomputed crc with the OGM, we | |
2386 | * prefer to recompute it to spot any possible inconsistency | |
9cfc7bd6 SE |
2387 | * in the global table |
2388 | */ | |
a513088d | 2389 | orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); |
a943cac1 ML |
2390 | |
2391 | /* The ttvn alone is not enough to guarantee consistency | |
2392 | * because a single value could represent different states | |
2393 | * (due to the wrap around). Thus a node has to check whether | |
2394 | * the resulting table (after applying the changes) is still | |
2395 | * consistent or not. E.g. a node could disconnect while its | |
2396 | * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case | |
2397 | * checking the CRC value is mandatory to detect the | |
9cfc7bd6 SE |
2398 | * inconsistency |
2399 | */ | |
a943cac1 ML |
2400 | if (orig_node->tt_crc != tt_crc) |
2401 | goto request_table; | |
a943cac1 ML |
2402 | } else { |
2403 | /* if we missed more than one change or our tables are not | |
9cfc7bd6 SE |
2404 | * in sync anymore -> request fresh tt data |
2405 | */ | |
17071578 AQ |
2406 | if (!orig_node->tt_initialised || ttvn != orig_ttvn || |
2407 | orig_node->tt_crc != tt_crc) { | |
a943cac1 | 2408 | request_table: |
39c75a51 | 2409 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
2410 | "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n", |
2411 | orig_node->orig, ttvn, orig_ttvn, tt_crc, | |
2412 | orig_node->tt_crc, tt_num_changes); | |
a513088d SE |
2413 | batadv_send_tt_request(bat_priv, orig_node, ttvn, |
2414 | tt_crc, full_table); | |
a943cac1 ML |
2415 | return; |
2416 | } | |
2417 | } | |
2418 | } | |
3275e7cc AQ |
2419 | |
2420 | /* returns true whether we know that the client has moved from its old | |
2421 | * originator to another one. This entry is kept is still kept for consistency | |
2422 | * purposes | |
2423 | */ | |
56303d34 | 2424 | bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv, |
08c36d3e | 2425 | uint8_t *addr) |
3275e7cc | 2426 | { |
56303d34 | 2427 | struct batadv_tt_global_entry *tt_global_entry; |
3275e7cc AQ |
2428 | bool ret = false; |
2429 | ||
a513088d | 2430 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
3275e7cc AQ |
2431 | if (!tt_global_entry) |
2432 | goto out; | |
2433 | ||
9f9ff08d | 2434 | ret = !!(tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM); |
a513088d | 2435 | batadv_tt_global_entry_free_ref(tt_global_entry); |
3275e7cc AQ |
2436 | out: |
2437 | return ret; | |
2438 | } | |
30cfd02b | 2439 | |
7c1fd91d AQ |
2440 | /** |
2441 | * batadv_tt_local_client_is_roaming - tells whether the client is roaming | |
2442 | * @bat_priv: the bat priv with all the soft interface information | |
2443 | * @addr: the MAC address of the local client to query | |
2444 | * | |
2445 | * Returns true if the local client is known to be roaming (it is not served by | |
2446 | * this node anymore) or not. If yes, the client is still present in the table | |
2447 | * to keep the latter consistent with the node TTVN | |
2448 | */ | |
2449 | bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv, | |
2450 | uint8_t *addr) | |
2451 | { | |
2452 | struct batadv_tt_local_entry *tt_local_entry; | |
2453 | bool ret = false; | |
2454 | ||
2455 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); | |
2456 | if (!tt_local_entry) | |
2457 | goto out; | |
2458 | ||
2459 | ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM; | |
2460 | batadv_tt_local_entry_free_ref(tt_local_entry); | |
2461 | out: | |
2462 | return ret; | |
2463 | ||
2464 | } | |
2465 | ||
30cfd02b AQ |
2466 | bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv, |
2467 | struct batadv_orig_node *orig_node, | |
2468 | const unsigned char *addr) | |
2469 | { | |
2470 | bool ret = false; | |
2471 | ||
2472 | if (!batadv_tt_global_add(bat_priv, orig_node, addr, | |
2473 | BATADV_TT_CLIENT_TEMP, | |
2474 | atomic_read(&orig_node->last_ttvn))) | |
2475 | goto out; | |
2476 | ||
2477 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
2478 | "Added temporary global client (addr: %pM orig: %pM)\n", | |
2479 | addr, orig_node->orig); | |
2480 | ret = true; | |
2481 | out: | |
2482 | return ret; | |
2483 | } |