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9cfc7bd6 | 1 | /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 | 2 | * |
35c133a0 | 3 | * Marek Lindner, Simon Wunderlich, Antonio Quartulli |
c6c8fea2 SE |
4 | * |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
c6c8fea2 SE |
18 | */ |
19 | ||
20 | #include "main.h" | |
21 | #include "translation-table.h" | |
22 | #include "soft-interface.h" | |
32ae9b22 | 23 | #include "hard-interface.h" |
a73105b8 | 24 | #include "send.h" |
c6c8fea2 SE |
25 | #include "hash.h" |
26 | #include "originator.h" | |
a73105b8 | 27 | #include "routing.h" |
20ff9d59 | 28 | #include "bridge_loop_avoidance.h" |
c6c8fea2 | 29 | |
a73105b8 AQ |
30 | #include <linux/crc16.h> |
31 | ||
56303d34 SE |
32 | static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, |
33 | struct batadv_orig_node *orig_node); | |
a513088d SE |
34 | static void batadv_tt_purge(struct work_struct *work); |
35 | static void | |
56303d34 | 36 | batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry); |
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) { | |
309 | orig_entry->orig_node->tt_poss_change = true; | |
310 | ||
a513088d SE |
311 | batadv_send_roam_adv(bat_priv, |
312 | tt_global_entry->common.addr, | |
313 | orig_entry->orig_node); | |
db08e6e5 SW |
314 | } |
315 | rcu_read_unlock(); | |
316 | /* The global entry has to be marked as ROAMING and | |
317 | * has to be kept for consistency purpose | |
318 | */ | |
acd34afa | 319 | tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; |
03fc3070 | 320 | tt_global_entry->roam_at = jiffies; |
7683fdc1 AQ |
321 | } |
322 | out: | |
323 | if (tt_local_entry) | |
a513088d | 324 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7683fdc1 | 325 | if (tt_global_entry) |
a513088d | 326 | batadv_tt_global_entry_free_ref(tt_global_entry); |
c6c8fea2 SE |
327 | } |
328 | ||
a513088d SE |
329 | static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff, |
330 | int *packet_buff_len, | |
331 | int min_packet_len, | |
332 | int new_packet_len) | |
be9aa4c1 ML |
333 | { |
334 | unsigned char *new_buff; | |
335 | ||
336 | new_buff = kmalloc(new_packet_len, GFP_ATOMIC); | |
337 | ||
338 | /* keep old buffer if kmalloc should fail */ | |
339 | if (new_buff) { | |
340 | memcpy(new_buff, *packet_buff, min_packet_len); | |
341 | kfree(*packet_buff); | |
342 | *packet_buff = new_buff; | |
343 | *packet_buff_len = new_packet_len; | |
344 | } | |
345 | } | |
346 | ||
56303d34 | 347 | static void batadv_tt_prepare_packet_buff(struct batadv_priv *bat_priv, |
a513088d SE |
348 | unsigned char **packet_buff, |
349 | int *packet_buff_len, | |
350 | int min_packet_len) | |
be9aa4c1 | 351 | { |
56303d34 | 352 | struct batadv_hard_iface *primary_if; |
be9aa4c1 ML |
353 | int req_len; |
354 | ||
e5d89254 | 355 | primary_if = batadv_primary_if_get_selected(bat_priv); |
be9aa4c1 ML |
356 | |
357 | req_len = min_packet_len; | |
807736f6 | 358 | req_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes)); |
be9aa4c1 ML |
359 | |
360 | /* if we have too many changes for one packet don't send any | |
361 | * and wait for the tt table request which will be fragmented | |
362 | */ | |
363 | if ((!primary_if) || (req_len > primary_if->soft_iface->mtu)) | |
364 | req_len = min_packet_len; | |
365 | ||
a513088d SE |
366 | batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, |
367 | min_packet_len, req_len); | |
be9aa4c1 ML |
368 | |
369 | if (primary_if) | |
e5d89254 | 370 | batadv_hardif_free_ref(primary_if); |
be9aa4c1 ML |
371 | } |
372 | ||
56303d34 | 373 | static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv, |
a513088d SE |
374 | unsigned char **packet_buff, |
375 | int *packet_buff_len, | |
376 | int min_packet_len) | |
c6c8fea2 | 377 | { |
56303d34 | 378 | struct batadv_tt_change_node *entry, *safe; |
be9aa4c1 ML |
379 | int count = 0, tot_changes = 0, new_len; |
380 | unsigned char *tt_buff; | |
381 | ||
a513088d SE |
382 | batadv_tt_prepare_packet_buff(bat_priv, packet_buff, |
383 | packet_buff_len, min_packet_len); | |
c6c8fea2 | 384 | |
be9aa4c1 ML |
385 | new_len = *packet_buff_len - min_packet_len; |
386 | tt_buff = *packet_buff + min_packet_len; | |
387 | ||
388 | if (new_len > 0) | |
08c36d3e | 389 | tot_changes = new_len / batadv_tt_len(1); |
c6c8fea2 | 390 | |
807736f6 SE |
391 | spin_lock_bh(&bat_priv->tt.changes_list_lock); |
392 | atomic_set(&bat_priv->tt.local_changes, 0); | |
c6c8fea2 | 393 | |
807736f6 | 394 | list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, |
7c64fd98 | 395 | list) { |
a73105b8 | 396 | if (count < tot_changes) { |
08c36d3e | 397 | memcpy(tt_buff + batadv_tt_len(count), |
96412690 | 398 | &entry->change, sizeof(struct batadv_tt_change)); |
c6c8fea2 SE |
399 | count++; |
400 | } | |
a73105b8 AQ |
401 | list_del(&entry->list); |
402 | kfree(entry); | |
c6c8fea2 | 403 | } |
807736f6 | 404 | spin_unlock_bh(&bat_priv->tt.changes_list_lock); |
a73105b8 AQ |
405 | |
406 | /* Keep the buffer for possible tt_request */ | |
807736f6 SE |
407 | spin_lock_bh(&bat_priv->tt.last_changeset_lock); |
408 | kfree(bat_priv->tt.last_changeset); | |
409 | bat_priv->tt.last_changeset_len = 0; | |
410 | bat_priv->tt.last_changeset = NULL; | |
be9aa4c1 ML |
411 | /* check whether this new OGM has no changes due to size problems */ |
412 | if (new_len > 0) { | |
413 | /* if kmalloc() fails we will reply with the full table | |
a73105b8 AQ |
414 | * instead of providing the diff |
415 | */ | |
807736f6 SE |
416 | bat_priv->tt.last_changeset = kmalloc(new_len, GFP_ATOMIC); |
417 | if (bat_priv->tt.last_changeset) { | |
418 | memcpy(bat_priv->tt.last_changeset, tt_buff, new_len); | |
419 | bat_priv->tt.last_changeset_len = new_len; | |
a73105b8 AQ |
420 | } |
421 | } | |
807736f6 | 422 | spin_unlock_bh(&bat_priv->tt.last_changeset_lock); |
c6c8fea2 | 423 | |
08ad76ec | 424 | return count; |
c6c8fea2 SE |
425 | } |
426 | ||
08c36d3e | 427 | int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
428 | { |
429 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 430 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 431 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
56303d34 SE |
432 | struct batadv_tt_common_entry *tt_common_entry; |
433 | struct batadv_hard_iface *primary_if; | |
7aadf889 | 434 | struct hlist_node *node; |
c6c8fea2 | 435 | struct hlist_head *head; |
c90681b8 AQ |
436 | uint32_t i; |
437 | int ret = 0; | |
32ae9b22 | 438 | |
e5d89254 | 439 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 440 | if (!primary_if) { |
86ceb360 SE |
441 | ret = seq_printf(seq, |
442 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
443 | net_dev->name); |
444 | goto out; | |
445 | } | |
c6c8fea2 | 446 | |
e9a4f295 | 447 | if (primary_if->if_status != BATADV_IF_ACTIVE) { |
86ceb360 SE |
448 | ret = seq_printf(seq, |
449 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
450 | net_dev->name); |
451 | goto out; | |
c6c8fea2 SE |
452 | } |
453 | ||
86ceb360 SE |
454 | seq_printf(seq, |
455 | "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n", | |
807736f6 | 456 | net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn)); |
c6c8fea2 | 457 | |
c6c8fea2 SE |
458 | for (i = 0; i < hash->size; i++) { |
459 | head = &hash->table[i]; | |
460 | ||
7aadf889 | 461 | rcu_read_lock(); |
48100bac | 462 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 463 | head, hash_entry) { |
d099c2c5 | 464 | seq_printf(seq, " * %pM [%c%c%c%c%c]\n", |
7c64fd98 SE |
465 | tt_common_entry->addr, |
466 | (tt_common_entry->flags & | |
acd34afa | 467 | BATADV_TT_CLIENT_ROAM ? 'R' : '.'), |
7c64fd98 | 468 | (tt_common_entry->flags & |
acd34afa | 469 | BATADV_TT_CLIENT_NOPURGE ? 'P' : '.'), |
7c64fd98 | 470 | (tt_common_entry->flags & |
acd34afa | 471 | BATADV_TT_CLIENT_NEW ? 'N' : '.'), |
7c64fd98 | 472 | (tt_common_entry->flags & |
acd34afa | 473 | BATADV_TT_CLIENT_PENDING ? 'X' : '.'), |
7c64fd98 | 474 | (tt_common_entry->flags & |
acd34afa | 475 | BATADV_TT_CLIENT_WIFI ? 'W' : '.')); |
c6c8fea2 | 476 | } |
7aadf889 | 477 | rcu_read_unlock(); |
c6c8fea2 | 478 | } |
32ae9b22 ML |
479 | out: |
480 | if (primary_if) | |
e5d89254 | 481 | batadv_hardif_free_ref(primary_if); |
32ae9b22 | 482 | return ret; |
c6c8fea2 SE |
483 | } |
484 | ||
56303d34 SE |
485 | static void |
486 | batadv_tt_local_set_pending(struct batadv_priv *bat_priv, | |
487 | struct batadv_tt_local_entry *tt_local_entry, | |
488 | uint16_t flags, const char *message) | |
c6c8fea2 | 489 | { |
a513088d SE |
490 | batadv_tt_local_event(bat_priv, tt_local_entry->common.addr, |
491 | tt_local_entry->common.flags | flags); | |
a73105b8 | 492 | |
015758d0 AQ |
493 | /* The local client has to be marked as "pending to be removed" but has |
494 | * to be kept in the table in order to send it in a full table | |
9cfc7bd6 SE |
495 | * response issued before the net ttvn increment (consistency check) |
496 | */ | |
acd34afa | 497 | tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING; |
c566dbbe | 498 | |
39c75a51 | 499 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
500 | "Local tt entry (%pM) pending to be removed: %s\n", |
501 | tt_local_entry->common.addr, message); | |
c6c8fea2 SE |
502 | } |
503 | ||
56303d34 | 504 | void batadv_tt_local_remove(struct batadv_priv *bat_priv, const uint8_t *addr, |
08c36d3e | 505 | const char *message, bool roaming) |
c6c8fea2 | 506 | { |
56303d34 | 507 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
42d0b044 | 508 | uint16_t flags; |
c6c8fea2 | 509 | |
a513088d | 510 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
511 | if (!tt_local_entry) |
512 | goto out; | |
513 | ||
acd34afa | 514 | flags = BATADV_TT_CLIENT_DEL; |
42d0b044 | 515 | if (roaming) |
acd34afa | 516 | flags |= BATADV_TT_CLIENT_ROAM; |
42d0b044 SE |
517 | |
518 | batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags, message); | |
7683fdc1 AQ |
519 | out: |
520 | if (tt_local_entry) | |
a513088d | 521 | batadv_tt_local_entry_free_ref(tt_local_entry); |
c6c8fea2 SE |
522 | } |
523 | ||
56303d34 | 524 | static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, |
acd34afa | 525 | struct hlist_head *head) |
c6c8fea2 | 526 | { |
56303d34 SE |
527 | struct batadv_tt_local_entry *tt_local_entry; |
528 | struct batadv_tt_common_entry *tt_common_entry; | |
7aadf889 | 529 | struct hlist_node *node, *node_tmp; |
acd34afa SE |
530 | |
531 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, head, | |
532 | hash_entry) { | |
533 | tt_local_entry = container_of(tt_common_entry, | |
56303d34 SE |
534 | struct batadv_tt_local_entry, |
535 | common); | |
acd34afa SE |
536 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE) |
537 | continue; | |
538 | ||
539 | /* entry already marked for deletion */ | |
540 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) | |
541 | continue; | |
542 | ||
543 | if (!batadv_has_timed_out(tt_local_entry->last_seen, | |
544 | BATADV_TT_LOCAL_TIMEOUT)) | |
545 | continue; | |
546 | ||
547 | batadv_tt_local_set_pending(bat_priv, tt_local_entry, | |
548 | BATADV_TT_CLIENT_DEL, "timed out"); | |
549 | } | |
550 | } | |
551 | ||
56303d34 | 552 | static void batadv_tt_local_purge(struct batadv_priv *bat_priv) |
acd34afa | 553 | { |
807736f6 | 554 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
c6c8fea2 | 555 | struct hlist_head *head; |
7683fdc1 | 556 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 557 | uint32_t i; |
c6c8fea2 | 558 | |
c6c8fea2 SE |
559 | for (i = 0; i < hash->size; i++) { |
560 | head = &hash->table[i]; | |
7683fdc1 | 561 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 562 | |
7683fdc1 | 563 | spin_lock_bh(list_lock); |
acd34afa | 564 | batadv_tt_local_purge_list(bat_priv, head); |
7683fdc1 | 565 | spin_unlock_bh(list_lock); |
c6c8fea2 SE |
566 | } |
567 | ||
c6c8fea2 SE |
568 | } |
569 | ||
56303d34 | 570 | static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 571 | { |
5bf74e9c | 572 | struct batadv_hashtable *hash; |
a73105b8 | 573 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
56303d34 SE |
574 | struct batadv_tt_common_entry *tt_common_entry; |
575 | struct batadv_tt_local_entry *tt_local; | |
7683fdc1 AQ |
576 | struct hlist_node *node, *node_tmp; |
577 | struct hlist_head *head; | |
c90681b8 | 578 | uint32_t i; |
a73105b8 | 579 | |
807736f6 | 580 | if (!bat_priv->tt.local_hash) |
c6c8fea2 SE |
581 | return; |
582 | ||
807736f6 | 583 | hash = bat_priv->tt.local_hash; |
a73105b8 AQ |
584 | |
585 | for (i = 0; i < hash->size; i++) { | |
586 | head = &hash->table[i]; | |
587 | list_lock = &hash->list_locks[i]; | |
588 | ||
589 | spin_lock_bh(list_lock); | |
48100bac | 590 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
a73105b8 AQ |
591 | head, hash_entry) { |
592 | hlist_del_rcu(node); | |
56303d34 SE |
593 | tt_local = container_of(tt_common_entry, |
594 | struct batadv_tt_local_entry, | |
595 | common); | |
596 | batadv_tt_local_entry_free_ref(tt_local); | |
a73105b8 AQ |
597 | } |
598 | spin_unlock_bh(list_lock); | |
599 | } | |
600 | ||
1a8eaf07 | 601 | batadv_hash_destroy(hash); |
a73105b8 | 602 | |
807736f6 | 603 | bat_priv->tt.local_hash = NULL; |
c6c8fea2 SE |
604 | } |
605 | ||
56303d34 | 606 | static int batadv_tt_global_init(struct batadv_priv *bat_priv) |
c6c8fea2 | 607 | { |
807736f6 | 608 | if (bat_priv->tt.global_hash) |
5346c35e | 609 | return 0; |
c6c8fea2 | 610 | |
807736f6 | 611 | bat_priv->tt.global_hash = batadv_hash_new(1024); |
c6c8fea2 | 612 | |
807736f6 | 613 | if (!bat_priv->tt.global_hash) |
5346c35e | 614 | return -ENOMEM; |
c6c8fea2 | 615 | |
5346c35e | 616 | return 0; |
c6c8fea2 SE |
617 | } |
618 | ||
56303d34 | 619 | static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 620 | { |
56303d34 | 621 | struct batadv_tt_change_node *entry, *safe; |
c6c8fea2 | 622 | |
807736f6 | 623 | spin_lock_bh(&bat_priv->tt.changes_list_lock); |
c6c8fea2 | 624 | |
807736f6 | 625 | list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, |
a73105b8 AQ |
626 | list) { |
627 | list_del(&entry->list); | |
628 | kfree(entry); | |
629 | } | |
c6c8fea2 | 630 | |
807736f6 SE |
631 | atomic_set(&bat_priv->tt.local_changes, 0); |
632 | spin_unlock_bh(&bat_priv->tt.changes_list_lock); | |
a73105b8 | 633 | } |
c6c8fea2 | 634 | |
d657e621 AQ |
635 | /* retrieves the orig_tt_list_entry belonging to orig_node from the |
636 | * batadv_tt_global_entry list | |
637 | * | |
638 | * returns it with an increased refcounter, NULL if not found | |
db08e6e5 | 639 | */ |
d657e621 AQ |
640 | static struct batadv_tt_orig_list_entry * |
641 | batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry, | |
642 | const struct batadv_orig_node *orig_node) | |
db08e6e5 | 643 | { |
d657e621 | 644 | struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL; |
db08e6e5 SW |
645 | const struct hlist_head *head; |
646 | struct hlist_node *node; | |
db08e6e5 SW |
647 | |
648 | rcu_read_lock(); | |
649 | head = &entry->orig_list; | |
650 | hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) { | |
d657e621 AQ |
651 | if (tmp_orig_entry->orig_node != orig_node) |
652 | continue; | |
653 | if (!atomic_inc_not_zero(&tmp_orig_entry->refcount)) | |
654 | continue; | |
655 | ||
656 | orig_entry = tmp_orig_entry; | |
657 | break; | |
db08e6e5 SW |
658 | } |
659 | rcu_read_unlock(); | |
d657e621 AQ |
660 | |
661 | return orig_entry; | |
662 | } | |
663 | ||
664 | /* find out if an orig_node is already in the list of a tt_global_entry. | |
665 | * returns true if found, false otherwise | |
666 | */ | |
667 | static bool | |
668 | batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry, | |
669 | const struct batadv_orig_node *orig_node) | |
670 | { | |
671 | struct batadv_tt_orig_list_entry *orig_entry; | |
672 | bool found = false; | |
673 | ||
674 | orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node); | |
675 | if (orig_entry) { | |
676 | found = true; | |
677 | batadv_tt_orig_list_entry_free_ref(orig_entry); | |
678 | } | |
679 | ||
db08e6e5 SW |
680 | return found; |
681 | } | |
682 | ||
a513088d | 683 | static void |
d657e621 | 684 | batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global, |
56303d34 | 685 | struct batadv_orig_node *orig_node, int ttvn) |
db08e6e5 | 686 | { |
56303d34 | 687 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 | 688 | |
d657e621 | 689 | orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node); |
30cfd02b AQ |
690 | if (orig_entry) { |
691 | /* refresh the ttvn: the current value could be a bogus one that | |
692 | * was added during a "temporary client detection" | |
693 | */ | |
694 | orig_entry->ttvn = ttvn; | |
d657e621 | 695 | goto out; |
30cfd02b | 696 | } |
d657e621 | 697 | |
db08e6e5 SW |
698 | orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC); |
699 | if (!orig_entry) | |
d657e621 | 700 | goto out; |
db08e6e5 SW |
701 | |
702 | INIT_HLIST_NODE(&orig_entry->list); | |
703 | atomic_inc(&orig_node->refcount); | |
704 | atomic_inc(&orig_node->tt_size); | |
705 | orig_entry->orig_node = orig_node; | |
706 | orig_entry->ttvn = ttvn; | |
d657e621 | 707 | atomic_set(&orig_entry->refcount, 2); |
db08e6e5 | 708 | |
d657e621 | 709 | spin_lock_bh(&tt_global->list_lock); |
db08e6e5 | 710 | hlist_add_head_rcu(&orig_entry->list, |
d657e621 AQ |
711 | &tt_global->orig_list); |
712 | spin_unlock_bh(&tt_global->list_lock); | |
713 | out: | |
714 | if (orig_entry) | |
715 | batadv_tt_orig_list_entry_free_ref(orig_entry); | |
db08e6e5 SW |
716 | } |
717 | ||
a73105b8 | 718 | /* caller must hold orig_node refcount */ |
56303d34 SE |
719 | int batadv_tt_global_add(struct batadv_priv *bat_priv, |
720 | struct batadv_orig_node *orig_node, | |
d4f44692 AQ |
721 | const unsigned char *tt_addr, uint8_t flags, |
722 | uint8_t ttvn) | |
a73105b8 | 723 | { |
56303d34 | 724 | struct batadv_tt_global_entry *tt_global_entry = NULL; |
7683fdc1 | 725 | int ret = 0; |
80b3f58c | 726 | int hash_added; |
56303d34 | 727 | struct batadv_tt_common_entry *common; |
c6c8fea2 | 728 | |
a513088d | 729 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr); |
a73105b8 AQ |
730 | |
731 | if (!tt_global_entry) { | |
d4f44692 | 732 | tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC); |
a73105b8 | 733 | if (!tt_global_entry) |
7683fdc1 AQ |
734 | goto out; |
735 | ||
c0a55929 SE |
736 | common = &tt_global_entry->common; |
737 | memcpy(common->addr, tt_addr, ETH_ALEN); | |
db08e6e5 | 738 | |
d4f44692 | 739 | common->flags = flags; |
cc47f66e | 740 | tt_global_entry->roam_at = 0; |
c0a55929 | 741 | atomic_set(&common->refcount, 2); |
30cfd02b | 742 | common->added_at = jiffies; |
db08e6e5 SW |
743 | |
744 | INIT_HLIST_HEAD(&tt_global_entry->orig_list); | |
745 | spin_lock_init(&tt_global_entry->list_lock); | |
7683fdc1 | 746 | |
807736f6 | 747 | hash_added = batadv_hash_add(bat_priv->tt.global_hash, |
a513088d SE |
748 | batadv_compare_tt, |
749 | batadv_choose_orig, common, | |
750 | &common->hash_entry); | |
80b3f58c SW |
751 | |
752 | if (unlikely(hash_added != 0)) { | |
753 | /* remove the reference for the hash */ | |
a513088d | 754 | batadv_tt_global_entry_free_ref(tt_global_entry); |
80b3f58c SW |
755 | goto out_remove; |
756 | } | |
a73105b8 | 757 | } else { |
30cfd02b AQ |
758 | /* If there is already a global entry, we can use this one for |
759 | * our processing. | |
760 | * But if we are trying to add a temporary client we can exit | |
761 | * directly because the temporary information should never | |
762 | * override any already known client state (whatever it is) | |
763 | */ | |
764 | if (flags & BATADV_TT_CLIENT_TEMP) | |
765 | goto out; | |
766 | ||
767 | /* if the client was temporary added before receiving the first | |
768 | * OGM announcing it, we have to clear the TEMP flag | |
769 | */ | |
770 | tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_TEMP; | |
db08e6e5 | 771 | |
e9c00136 AQ |
772 | /* the change can carry possible "attribute" flags like the |
773 | * TT_CLIENT_WIFI, therefore they have to be copied in the | |
774 | * client entry | |
775 | */ | |
776 | tt_global_entry->common.flags |= flags; | |
777 | ||
acd34afa SE |
778 | /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only |
779 | * one originator left in the list and we previously received a | |
db08e6e5 SW |
780 | * delete + roaming change for this originator. |
781 | * | |
782 | * We should first delete the old originator before adding the | |
783 | * new one. | |
784 | */ | |
acd34afa | 785 | if (tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM) { |
a513088d | 786 | batadv_tt_global_del_orig_list(tt_global_entry); |
acd34afa | 787 | tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM; |
db08e6e5 | 788 | tt_global_entry->roam_at = 0; |
a73105b8 AQ |
789 | } |
790 | } | |
30cfd02b | 791 | /* add the new orig_entry (if needed) or update it */ |
d657e621 | 792 | batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn); |
c6c8fea2 | 793 | |
39c75a51 | 794 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
795 | "Creating new global tt entry: %pM (via %pM)\n", |
796 | tt_global_entry->common.addr, orig_node->orig); | |
c6c8fea2 | 797 | |
80b3f58c | 798 | out_remove: |
a73105b8 | 799 | /* remove address from local hash if present */ |
08c36d3e | 800 | batadv_tt_local_remove(bat_priv, tt_global_entry->common.addr, |
acd34afa SE |
801 | "global tt received", |
802 | flags & BATADV_TT_CLIENT_ROAM); | |
7683fdc1 AQ |
803 | ret = 1; |
804 | out: | |
805 | if (tt_global_entry) | |
a513088d | 806 | batadv_tt_global_entry_free_ref(tt_global_entry); |
7683fdc1 | 807 | return ret; |
c6c8fea2 SE |
808 | } |
809 | ||
db08e6e5 SW |
810 | /* print all orig nodes who announce the address for this global entry. |
811 | * it is assumed that the caller holds rcu_read_lock(); | |
812 | */ | |
a513088d | 813 | static void |
56303d34 | 814 | batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry, |
a513088d | 815 | struct seq_file *seq) |
db08e6e5 SW |
816 | { |
817 | struct hlist_head *head; | |
818 | struct hlist_node *node; | |
56303d34 SE |
819 | struct batadv_tt_orig_list_entry *orig_entry; |
820 | struct batadv_tt_common_entry *tt_common_entry; | |
db08e6e5 SW |
821 | uint16_t flags; |
822 | uint8_t last_ttvn; | |
823 | ||
824 | tt_common_entry = &tt_global_entry->common; | |
825 | ||
826 | head = &tt_global_entry->orig_list; | |
827 | ||
828 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
829 | flags = tt_common_entry->flags; | |
830 | last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn); | |
30cfd02b | 831 | seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c%c]\n", |
db08e6e5 SW |
832 | tt_global_entry->common.addr, orig_entry->ttvn, |
833 | orig_entry->orig_node->orig, last_ttvn, | |
acd34afa | 834 | (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), |
30cfd02b AQ |
835 | (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), |
836 | (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.')); | |
db08e6e5 SW |
837 | } |
838 | } | |
839 | ||
08c36d3e | 840 | int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
841 | { |
842 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 843 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 844 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
56303d34 SE |
845 | struct batadv_tt_common_entry *tt_common_entry; |
846 | struct batadv_tt_global_entry *tt_global; | |
847 | struct batadv_hard_iface *primary_if; | |
7aadf889 | 848 | struct hlist_node *node; |
c6c8fea2 | 849 | struct hlist_head *head; |
c90681b8 AQ |
850 | uint32_t i; |
851 | int ret = 0; | |
32ae9b22 | 852 | |
e5d89254 | 853 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 854 | if (!primary_if) { |
86ceb360 SE |
855 | ret = seq_printf(seq, |
856 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
857 | net_dev->name); |
858 | goto out; | |
859 | } | |
c6c8fea2 | 860 | |
e9a4f295 | 861 | if (primary_if->if_status != BATADV_IF_ACTIVE) { |
86ceb360 SE |
862 | ret = seq_printf(seq, |
863 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
864 | net_dev->name); |
865 | goto out; | |
c6c8fea2 SE |
866 | } |
867 | ||
2dafb49d AQ |
868 | seq_printf(seq, |
869 | "Globally announced TT entries received via the mesh %s\n", | |
c6c8fea2 | 870 | net_dev->name); |
df6edb9e AQ |
871 | seq_printf(seq, " %-13s %s %-15s %s %s\n", |
872 | "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags"); | |
c6c8fea2 | 873 | |
c6c8fea2 SE |
874 | for (i = 0; i < hash->size; i++) { |
875 | head = &hash->table[i]; | |
876 | ||
7aadf889 | 877 | rcu_read_lock(); |
48100bac | 878 | hlist_for_each_entry_rcu(tt_common_entry, node, |
7aadf889 | 879 | head, hash_entry) { |
56303d34 SE |
880 | tt_global = container_of(tt_common_entry, |
881 | struct batadv_tt_global_entry, | |
882 | common); | |
883 | batadv_tt_global_print_entry(tt_global, seq); | |
c6c8fea2 | 884 | } |
7aadf889 | 885 | rcu_read_unlock(); |
c6c8fea2 | 886 | } |
32ae9b22 ML |
887 | out: |
888 | if (primary_if) | |
e5d89254 | 889 | batadv_hardif_free_ref(primary_if); |
32ae9b22 | 890 | return ret; |
c6c8fea2 SE |
891 | } |
892 | ||
db08e6e5 | 893 | /* deletes the orig list of a tt_global_entry */ |
a513088d | 894 | static void |
56303d34 | 895 | batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry) |
c6c8fea2 | 896 | { |
db08e6e5 SW |
897 | struct hlist_head *head; |
898 | struct hlist_node *node, *safe; | |
56303d34 | 899 | struct batadv_tt_orig_list_entry *orig_entry; |
a73105b8 | 900 | |
db08e6e5 SW |
901 | spin_lock_bh(&tt_global_entry->list_lock); |
902 | head = &tt_global_entry->orig_list; | |
903 | hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { | |
904 | hlist_del_rcu(node); | |
a513088d | 905 | batadv_tt_orig_list_entry_free_ref(orig_entry); |
db08e6e5 SW |
906 | } |
907 | spin_unlock_bh(&tt_global_entry->list_lock); | |
c6c8fea2 | 908 | |
db08e6e5 SW |
909 | } |
910 | ||
a513088d | 911 | static void |
56303d34 SE |
912 | batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv, |
913 | struct batadv_tt_global_entry *tt_global_entry, | |
914 | struct batadv_orig_node *orig_node, | |
a513088d | 915 | const char *message) |
db08e6e5 SW |
916 | { |
917 | struct hlist_head *head; | |
918 | struct hlist_node *node, *safe; | |
56303d34 | 919 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 SW |
920 | |
921 | spin_lock_bh(&tt_global_entry->list_lock); | |
922 | head = &tt_global_entry->orig_list; | |
923 | hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { | |
924 | if (orig_entry->orig_node == orig_node) { | |
39c75a51 | 925 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
926 | "Deleting %pM from global tt entry %pM: %s\n", |
927 | orig_node->orig, | |
928 | tt_global_entry->common.addr, message); | |
db08e6e5 | 929 | hlist_del_rcu(node); |
a513088d | 930 | batadv_tt_orig_list_entry_free_ref(orig_entry); |
db08e6e5 SW |
931 | } |
932 | } | |
933 | spin_unlock_bh(&tt_global_entry->list_lock); | |
934 | } | |
935 | ||
56303d34 SE |
936 | static void |
937 | batadv_tt_global_del_struct(struct batadv_priv *bat_priv, | |
938 | struct batadv_tt_global_entry *tt_global_entry, | |
939 | const char *message) | |
db08e6e5 | 940 | { |
39c75a51 SE |
941 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
942 | "Deleting global tt entry %pM: %s\n", | |
1eda58bf | 943 | tt_global_entry->common.addr, message); |
7683fdc1 | 944 | |
807736f6 | 945 | batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt, |
da641193 | 946 | batadv_choose_orig, tt_global_entry->common.addr); |
a513088d | 947 | batadv_tt_global_entry_free_ref(tt_global_entry); |
db08e6e5 | 948 | |
c6c8fea2 SE |
949 | } |
950 | ||
db08e6e5 | 951 | /* If the client is to be deleted, we check if it is the last origantor entry |
acd34afa SE |
952 | * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the |
953 | * timer, otherwise we simply remove the originator scheduled for deletion. | |
db08e6e5 | 954 | */ |
a513088d | 955 | static void |
56303d34 SE |
956 | batadv_tt_global_del_roaming(struct batadv_priv *bat_priv, |
957 | struct batadv_tt_global_entry *tt_global_entry, | |
958 | struct batadv_orig_node *orig_node, | |
959 | const char *message) | |
db08e6e5 SW |
960 | { |
961 | bool last_entry = true; | |
962 | struct hlist_head *head; | |
963 | struct hlist_node *node; | |
56303d34 | 964 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 SW |
965 | |
966 | /* no local entry exists, case 1: | |
967 | * Check if this is the last one or if other entries exist. | |
968 | */ | |
969 | ||
970 | rcu_read_lock(); | |
971 | head = &tt_global_entry->orig_list; | |
972 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
973 | if (orig_entry->orig_node != orig_node) { | |
974 | last_entry = false; | |
975 | break; | |
976 | } | |
977 | } | |
978 | rcu_read_unlock(); | |
979 | ||
980 | if (last_entry) { | |
981 | /* its the last one, mark for roaming. */ | |
acd34afa | 982 | tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; |
db08e6e5 SW |
983 | tt_global_entry->roam_at = jiffies; |
984 | } else | |
985 | /* there is another entry, we can simply delete this | |
986 | * one and can still use the other one. | |
987 | */ | |
a513088d SE |
988 | batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, |
989 | orig_node, message); | |
db08e6e5 SW |
990 | } |
991 | ||
992 | ||
993 | ||
56303d34 SE |
994 | static void batadv_tt_global_del(struct batadv_priv *bat_priv, |
995 | struct batadv_orig_node *orig_node, | |
a513088d SE |
996 | const unsigned char *addr, |
997 | const char *message, bool roaming) | |
a73105b8 | 998 | { |
56303d34 SE |
999 | struct batadv_tt_global_entry *tt_global_entry = NULL; |
1000 | struct batadv_tt_local_entry *local_entry = NULL; | |
a73105b8 | 1001 | |
a513088d | 1002 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
db08e6e5 | 1003 | if (!tt_global_entry) |
7683fdc1 | 1004 | goto out; |
a73105b8 | 1005 | |
db08e6e5 | 1006 | if (!roaming) { |
a513088d SE |
1007 | batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, |
1008 | orig_node, message); | |
db08e6e5 SW |
1009 | |
1010 | if (hlist_empty(&tt_global_entry->orig_list)) | |
a513088d SE |
1011 | batadv_tt_global_del_struct(bat_priv, tt_global_entry, |
1012 | message); | |
db08e6e5 SW |
1013 | |
1014 | goto out; | |
1015 | } | |
92f90f56 SE |
1016 | |
1017 | /* if we are deleting a global entry due to a roam | |
1018 | * event, there are two possibilities: | |
db08e6e5 SW |
1019 | * 1) the client roamed from node A to node B => if there |
1020 | * is only one originator left for this client, we mark | |
acd34afa | 1021 | * it with BATADV_TT_CLIENT_ROAM, we start a timer and we |
92f90f56 SE |
1022 | * wait for node B to claim it. In case of timeout |
1023 | * the entry is purged. | |
db08e6e5 SW |
1024 | * |
1025 | * If there are other originators left, we directly delete | |
1026 | * the originator. | |
92f90f56 | 1027 | * 2) the client roamed to us => we can directly delete |
9cfc7bd6 SE |
1028 | * the global entry, since it is useless now. |
1029 | */ | |
a513088d SE |
1030 | local_entry = batadv_tt_local_hash_find(bat_priv, |
1031 | tt_global_entry->common.addr); | |
1032 | if (local_entry) { | |
db08e6e5 | 1033 | /* local entry exists, case 2: client roamed to us. */ |
a513088d SE |
1034 | batadv_tt_global_del_orig_list(tt_global_entry); |
1035 | batadv_tt_global_del_struct(bat_priv, tt_global_entry, message); | |
db08e6e5 SW |
1036 | } else |
1037 | /* no local entry exists, case 1: check for roaming */ | |
a513088d SE |
1038 | batadv_tt_global_del_roaming(bat_priv, tt_global_entry, |
1039 | orig_node, message); | |
92f90f56 | 1040 | |
92f90f56 | 1041 | |
cc47f66e | 1042 | out: |
7683fdc1 | 1043 | if (tt_global_entry) |
a513088d SE |
1044 | batadv_tt_global_entry_free_ref(tt_global_entry); |
1045 | if (local_entry) | |
1046 | batadv_tt_local_entry_free_ref(local_entry); | |
a73105b8 AQ |
1047 | } |
1048 | ||
56303d34 SE |
1049 | void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, |
1050 | struct batadv_orig_node *orig_node, | |
1051 | const char *message) | |
c6c8fea2 | 1052 | { |
56303d34 SE |
1053 | struct batadv_tt_global_entry *tt_global; |
1054 | struct batadv_tt_common_entry *tt_common_entry; | |
c90681b8 | 1055 | uint32_t i; |
807736f6 | 1056 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
a73105b8 AQ |
1057 | struct hlist_node *node, *safe; |
1058 | struct hlist_head *head; | |
7683fdc1 | 1059 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c6c8fea2 | 1060 | |
6e801494 SW |
1061 | if (!hash) |
1062 | return; | |
1063 | ||
a73105b8 AQ |
1064 | for (i = 0; i < hash->size; i++) { |
1065 | head = &hash->table[i]; | |
7683fdc1 | 1066 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 1067 | |
7683fdc1 | 1068 | spin_lock_bh(list_lock); |
48100bac | 1069 | hlist_for_each_entry_safe(tt_common_entry, node, safe, |
7c64fd98 | 1070 | head, hash_entry) { |
56303d34 SE |
1071 | tt_global = container_of(tt_common_entry, |
1072 | struct batadv_tt_global_entry, | |
1073 | common); | |
db08e6e5 | 1074 | |
56303d34 | 1075 | batadv_tt_global_del_orig_entry(bat_priv, tt_global, |
a513088d | 1076 | orig_node, message); |
db08e6e5 | 1077 | |
56303d34 | 1078 | if (hlist_empty(&tt_global->orig_list)) { |
39c75a51 | 1079 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 1080 | "Deleting global tt entry %pM: %s\n", |
56303d34 | 1081 | tt_global->common.addr, message); |
7683fdc1 | 1082 | hlist_del_rcu(node); |
56303d34 | 1083 | batadv_tt_global_entry_free_ref(tt_global); |
7683fdc1 | 1084 | } |
a73105b8 | 1085 | } |
7683fdc1 | 1086 | spin_unlock_bh(list_lock); |
c6c8fea2 | 1087 | } |
17071578 | 1088 | orig_node->tt_initialised = false; |
c6c8fea2 SE |
1089 | } |
1090 | ||
30cfd02b AQ |
1091 | static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global, |
1092 | char **msg) | |
cc47f66e | 1093 | { |
30cfd02b AQ |
1094 | bool purge = false; |
1095 | unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT; | |
1096 | unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT; | |
42d0b044 | 1097 | |
30cfd02b AQ |
1098 | if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) && |
1099 | batadv_has_timed_out(tt_global->roam_at, roam_timeout)) { | |
1100 | purge = true; | |
1101 | *msg = "Roaming timeout\n"; | |
1102 | } | |
42d0b044 | 1103 | |
30cfd02b AQ |
1104 | if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) && |
1105 | batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) { | |
1106 | purge = true; | |
1107 | *msg = "Temporary client timeout\n"; | |
42d0b044 | 1108 | } |
30cfd02b AQ |
1109 | |
1110 | return purge; | |
42d0b044 SE |
1111 | } |
1112 | ||
30cfd02b | 1113 | static void batadv_tt_global_purge(struct batadv_priv *bat_priv) |
42d0b044 | 1114 | { |
807736f6 | 1115 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
cc47f66e | 1116 | struct hlist_head *head; |
30cfd02b | 1117 | struct hlist_node *node, *node_tmp; |
7683fdc1 | 1118 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
c90681b8 | 1119 | uint32_t i; |
30cfd02b AQ |
1120 | char *msg = NULL; |
1121 | struct batadv_tt_common_entry *tt_common; | |
1122 | struct batadv_tt_global_entry *tt_global; | |
cc47f66e | 1123 | |
cc47f66e AQ |
1124 | for (i = 0; i < hash->size; i++) { |
1125 | head = &hash->table[i]; | |
7683fdc1 | 1126 | list_lock = &hash->list_locks[i]; |
cc47f66e | 1127 | |
7683fdc1 | 1128 | spin_lock_bh(list_lock); |
30cfd02b AQ |
1129 | hlist_for_each_entry_safe(tt_common, node, node_tmp, head, |
1130 | hash_entry) { | |
1131 | tt_global = container_of(tt_common, | |
1132 | struct batadv_tt_global_entry, | |
1133 | common); | |
1134 | ||
1135 | if (!batadv_tt_global_to_purge(tt_global, &msg)) | |
1136 | continue; | |
1137 | ||
1138 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
1139 | "Deleting global tt entry (%pM): %s\n", | |
1140 | tt_global->common.addr, msg); | |
1141 | ||
1142 | hlist_del_rcu(node); | |
1143 | ||
1144 | batadv_tt_global_entry_free_ref(tt_global); | |
1145 | } | |
7683fdc1 | 1146 | spin_unlock_bh(list_lock); |
cc47f66e | 1147 | } |
cc47f66e AQ |
1148 | } |
1149 | ||
56303d34 | 1150 | static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 1151 | { |
5bf74e9c | 1152 | struct batadv_hashtable *hash; |
7683fdc1 | 1153 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
56303d34 SE |
1154 | struct batadv_tt_common_entry *tt_common_entry; |
1155 | struct batadv_tt_global_entry *tt_global; | |
7683fdc1 AQ |
1156 | struct hlist_node *node, *node_tmp; |
1157 | struct hlist_head *head; | |
c90681b8 | 1158 | uint32_t i; |
7683fdc1 | 1159 | |
807736f6 | 1160 | if (!bat_priv->tt.global_hash) |
c6c8fea2 SE |
1161 | return; |
1162 | ||
807736f6 | 1163 | hash = bat_priv->tt.global_hash; |
7683fdc1 AQ |
1164 | |
1165 | for (i = 0; i < hash->size; i++) { | |
1166 | head = &hash->table[i]; | |
1167 | list_lock = &hash->list_locks[i]; | |
1168 | ||
1169 | spin_lock_bh(list_lock); | |
48100bac | 1170 | hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, |
7683fdc1 AQ |
1171 | head, hash_entry) { |
1172 | hlist_del_rcu(node); | |
56303d34 SE |
1173 | tt_global = container_of(tt_common_entry, |
1174 | struct batadv_tt_global_entry, | |
1175 | common); | |
1176 | batadv_tt_global_entry_free_ref(tt_global); | |
7683fdc1 AQ |
1177 | } |
1178 | spin_unlock_bh(list_lock); | |
1179 | } | |
1180 | ||
1a8eaf07 | 1181 | batadv_hash_destroy(hash); |
7683fdc1 | 1182 | |
807736f6 | 1183 | bat_priv->tt.global_hash = NULL; |
c6c8fea2 SE |
1184 | } |
1185 | ||
56303d34 SE |
1186 | static bool |
1187 | _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry, | |
1188 | struct batadv_tt_global_entry *tt_global_entry) | |
59b699cd AQ |
1189 | { |
1190 | bool ret = false; | |
1191 | ||
acd34afa SE |
1192 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI && |
1193 | tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI) | |
59b699cd AQ |
1194 | ret = true; |
1195 | ||
1196 | return ret; | |
1197 | } | |
1198 | ||
56303d34 SE |
1199 | struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, |
1200 | const uint8_t *src, | |
1201 | const uint8_t *addr) | |
c6c8fea2 | 1202 | { |
56303d34 SE |
1203 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
1204 | struct batadv_tt_global_entry *tt_global_entry = NULL; | |
1205 | struct batadv_orig_node *orig_node = NULL; | |
1206 | struct batadv_neigh_node *router = NULL; | |
db08e6e5 SW |
1207 | struct hlist_head *head; |
1208 | struct hlist_node *node; | |
56303d34 | 1209 | struct batadv_tt_orig_list_entry *orig_entry; |
db08e6e5 | 1210 | int best_tq; |
c6c8fea2 | 1211 | |
3d393e47 | 1212 | if (src && atomic_read(&bat_priv->ap_isolation)) { |
a513088d | 1213 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, src); |
3d393e47 AQ |
1214 | if (!tt_local_entry) |
1215 | goto out; | |
1216 | } | |
7aadf889 | 1217 | |
a513088d | 1218 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
2dafb49d | 1219 | if (!tt_global_entry) |
7b36e8ee | 1220 | goto out; |
7aadf889 | 1221 | |
3d393e47 | 1222 | /* check whether the clients should not communicate due to AP |
9cfc7bd6 SE |
1223 | * isolation |
1224 | */ | |
a513088d SE |
1225 | if (tt_local_entry && |
1226 | _batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) | |
3d393e47 AQ |
1227 | goto out; |
1228 | ||
db08e6e5 | 1229 | best_tq = 0; |
c6c8fea2 | 1230 | |
db08e6e5 SW |
1231 | rcu_read_lock(); |
1232 | head = &tt_global_entry->orig_list; | |
1233 | hlist_for_each_entry_rcu(orig_entry, node, head, list) { | |
7d211efc | 1234 | router = batadv_orig_node_get_router(orig_entry->orig_node); |
db08e6e5 SW |
1235 | if (!router) |
1236 | continue; | |
c6c8fea2 | 1237 | |
db08e6e5 SW |
1238 | if (router->tq_avg > best_tq) { |
1239 | orig_node = orig_entry->orig_node; | |
1240 | best_tq = router->tq_avg; | |
1241 | } | |
7d211efc | 1242 | batadv_neigh_node_free_ref(router); |
db08e6e5 SW |
1243 | } |
1244 | /* found anything? */ | |
1245 | if (orig_node && !atomic_inc_not_zero(&orig_node->refcount)) | |
1246 | orig_node = NULL; | |
1247 | rcu_read_unlock(); | |
7b36e8ee | 1248 | out: |
3d393e47 | 1249 | if (tt_global_entry) |
a513088d | 1250 | batadv_tt_global_entry_free_ref(tt_global_entry); |
3d393e47 | 1251 | if (tt_local_entry) |
a513088d | 1252 | batadv_tt_local_entry_free_ref(tt_local_entry); |
3d393e47 | 1253 | |
7b36e8ee | 1254 | return orig_node; |
c6c8fea2 | 1255 | } |
a73105b8 AQ |
1256 | |
1257 | /* Calculates the checksum of the local table of a given orig_node */ | |
56303d34 SE |
1258 | static uint16_t batadv_tt_global_crc(struct batadv_priv *bat_priv, |
1259 | struct batadv_orig_node *orig_node) | |
a73105b8 AQ |
1260 | { |
1261 | uint16_t total = 0, total_one; | |
807736f6 | 1262 | struct batadv_hashtable *hash = bat_priv->tt.global_hash; |
56303d34 SE |
1263 | struct batadv_tt_common_entry *tt_common; |
1264 | struct batadv_tt_global_entry *tt_global; | |
a73105b8 AQ |
1265 | struct hlist_node *node; |
1266 | struct hlist_head *head; | |
c90681b8 AQ |
1267 | uint32_t i; |
1268 | int j; | |
a73105b8 AQ |
1269 | |
1270 | for (i = 0; i < hash->size; i++) { | |
1271 | head = &hash->table[i]; | |
1272 | ||
1273 | rcu_read_lock(); | |
acd34afa | 1274 | hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) { |
56303d34 SE |
1275 | tt_global = container_of(tt_common, |
1276 | struct batadv_tt_global_entry, | |
1277 | common); | |
db08e6e5 SW |
1278 | /* Roaming clients are in the global table for |
1279 | * consistency only. They don't have to be | |
1280 | * taken into account while computing the | |
1281 | * global crc | |
1282 | */ | |
acd34afa | 1283 | if (tt_common->flags & BATADV_TT_CLIENT_ROAM) |
db08e6e5 | 1284 | continue; |
30cfd02b AQ |
1285 | /* Temporary clients have not been announced yet, so |
1286 | * they have to be skipped while computing the global | |
1287 | * crc | |
1288 | */ | |
1289 | if (tt_common->flags & BATADV_TT_CLIENT_TEMP) | |
1290 | continue; | |
db08e6e5 SW |
1291 | |
1292 | /* find out if this global entry is announced by this | |
1293 | * originator | |
1294 | */ | |
56303d34 | 1295 | if (!batadv_tt_global_entry_has_orig(tt_global, |
a513088d | 1296 | orig_node)) |
db08e6e5 SW |
1297 | continue; |
1298 | ||
1299 | total_one = 0; | |
1300 | for (j = 0; j < ETH_ALEN; j++) | |
1301 | total_one = crc16_byte(total_one, | |
acd34afa | 1302 | tt_common->addr[j]); |
db08e6e5 | 1303 | total ^= total_one; |
a73105b8 AQ |
1304 | } |
1305 | rcu_read_unlock(); | |
1306 | } | |
1307 | ||
1308 | return total; | |
1309 | } | |
1310 | ||
1311 | /* Calculates the checksum of the local table */ | |
56303d34 | 1312 | static uint16_t batadv_tt_local_crc(struct batadv_priv *bat_priv) |
a73105b8 AQ |
1313 | { |
1314 | uint16_t total = 0, total_one; | |
807736f6 | 1315 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
56303d34 | 1316 | struct batadv_tt_common_entry *tt_common; |
a73105b8 AQ |
1317 | struct hlist_node *node; |
1318 | struct hlist_head *head; | |
c90681b8 AQ |
1319 | uint32_t i; |
1320 | int j; | |
a73105b8 AQ |
1321 | |
1322 | for (i = 0; i < hash->size; i++) { | |
1323 | head = &hash->table[i]; | |
1324 | ||
1325 | rcu_read_lock(); | |
acd34afa | 1326 | hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) { |
058d0e26 | 1327 | /* not yet committed clients have not to be taken into |
9cfc7bd6 SE |
1328 | * account while computing the CRC |
1329 | */ | |
acd34afa | 1330 | if (tt_common->flags & BATADV_TT_CLIENT_NEW) |
058d0e26 | 1331 | continue; |
a73105b8 AQ |
1332 | total_one = 0; |
1333 | for (j = 0; j < ETH_ALEN; j++) | |
1334 | total_one = crc16_byte(total_one, | |
acd34afa | 1335 | tt_common->addr[j]); |
a73105b8 AQ |
1336 | total ^= total_one; |
1337 | } | |
a73105b8 AQ |
1338 | rcu_read_unlock(); |
1339 | } | |
1340 | ||
1341 | return total; | |
1342 | } | |
1343 | ||
56303d34 | 1344 | static void batadv_tt_req_list_free(struct batadv_priv *bat_priv) |
a73105b8 | 1345 | { |
56303d34 | 1346 | struct batadv_tt_req_node *node, *safe; |
a73105b8 | 1347 | |
807736f6 | 1348 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 | 1349 | |
807736f6 | 1350 | list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { |
a73105b8 AQ |
1351 | list_del(&node->list); |
1352 | kfree(node); | |
1353 | } | |
1354 | ||
807736f6 | 1355 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1356 | } |
1357 | ||
56303d34 SE |
1358 | static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv, |
1359 | struct batadv_orig_node *orig_node, | |
a513088d SE |
1360 | const unsigned char *tt_buff, |
1361 | uint8_t tt_num_changes) | |
a73105b8 | 1362 | { |
08c36d3e | 1363 | uint16_t tt_buff_len = batadv_tt_len(tt_num_changes); |
a73105b8 AQ |
1364 | |
1365 | /* Replace the old buffer only if I received something in the | |
9cfc7bd6 SE |
1366 | * last OGM (the OGM could carry no changes) |
1367 | */ | |
a73105b8 AQ |
1368 | spin_lock_bh(&orig_node->tt_buff_lock); |
1369 | if (tt_buff_len > 0) { | |
1370 | kfree(orig_node->tt_buff); | |
1371 | orig_node->tt_buff_len = 0; | |
1372 | orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); | |
1373 | if (orig_node->tt_buff) { | |
1374 | memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); | |
1375 | orig_node->tt_buff_len = tt_buff_len; | |
1376 | } | |
1377 | } | |
1378 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1379 | } | |
1380 | ||
56303d34 | 1381 | static void batadv_tt_req_purge(struct batadv_priv *bat_priv) |
a73105b8 | 1382 | { |
56303d34 | 1383 | struct batadv_tt_req_node *node, *safe; |
a73105b8 | 1384 | |
807736f6 SE |
1385 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
1386 | list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { | |
42d0b044 SE |
1387 | if (batadv_has_timed_out(node->issued_at, |
1388 | BATADV_TT_REQUEST_TIMEOUT)) { | |
a73105b8 AQ |
1389 | list_del(&node->list); |
1390 | kfree(node); | |
1391 | } | |
1392 | } | |
807736f6 | 1393 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1394 | } |
1395 | ||
1396 | /* returns the pointer to the new tt_req_node struct if no request | |
9cfc7bd6 SE |
1397 | * has already been issued for this orig_node, NULL otherwise |
1398 | */ | |
56303d34 SE |
1399 | static struct batadv_tt_req_node * |
1400 | batadv_new_tt_req_node(struct batadv_priv *bat_priv, | |
1401 | struct batadv_orig_node *orig_node) | |
a73105b8 | 1402 | { |
56303d34 | 1403 | struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; |
a73105b8 | 1404 | |
807736f6 SE |
1405 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
1406 | list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) { | |
1eda58bf SE |
1407 | if (batadv_compare_eth(tt_req_node_tmp, orig_node) && |
1408 | !batadv_has_timed_out(tt_req_node_tmp->issued_at, | |
42d0b044 | 1409 | BATADV_TT_REQUEST_TIMEOUT)) |
a73105b8 AQ |
1410 | goto unlock; |
1411 | } | |
1412 | ||
1413 | tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); | |
1414 | if (!tt_req_node) | |
1415 | goto unlock; | |
1416 | ||
1417 | memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); | |
1418 | tt_req_node->issued_at = jiffies; | |
1419 | ||
807736f6 | 1420 | list_add(&tt_req_node->list, &bat_priv->tt.req_list); |
a73105b8 | 1421 | unlock: |
807736f6 | 1422 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1423 | return tt_req_node; |
1424 | } | |
1425 | ||
058d0e26 | 1426 | /* data_ptr is useless here, but has to be kept to respect the prototype */ |
a513088d SE |
1427 | static int batadv_tt_local_valid_entry(const void *entry_ptr, |
1428 | const void *data_ptr) | |
058d0e26 | 1429 | { |
56303d34 | 1430 | const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; |
058d0e26 | 1431 | |
acd34afa | 1432 | if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW) |
058d0e26 AQ |
1433 | return 0; |
1434 | return 1; | |
1435 | } | |
1436 | ||
a513088d SE |
1437 | static int batadv_tt_global_valid(const void *entry_ptr, |
1438 | const void *data_ptr) | |
a73105b8 | 1439 | { |
56303d34 SE |
1440 | const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; |
1441 | const struct batadv_tt_global_entry *tt_global_entry; | |
1442 | const struct batadv_orig_node *orig_node = data_ptr; | |
a73105b8 | 1443 | |
30cfd02b AQ |
1444 | if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM || |
1445 | tt_common_entry->flags & BATADV_TT_CLIENT_TEMP) | |
cc47f66e AQ |
1446 | return 0; |
1447 | ||
56303d34 SE |
1448 | tt_global_entry = container_of(tt_common_entry, |
1449 | struct batadv_tt_global_entry, | |
48100bac AQ |
1450 | common); |
1451 | ||
a513088d | 1452 | return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node); |
a73105b8 AQ |
1453 | } |
1454 | ||
a513088d SE |
1455 | static struct sk_buff * |
1456 | batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, | |
5bf74e9c | 1457 | struct batadv_hashtable *hash, |
56303d34 | 1458 | struct batadv_hard_iface *primary_if, |
a513088d SE |
1459 | int (*valid_cb)(const void *, const void *), |
1460 | void *cb_data) | |
a73105b8 | 1461 | { |
56303d34 | 1462 | struct batadv_tt_common_entry *tt_common_entry; |
96412690 SE |
1463 | struct batadv_tt_query_packet *tt_response; |
1464 | struct batadv_tt_change *tt_change; | |
a73105b8 AQ |
1465 | struct hlist_node *node; |
1466 | struct hlist_head *head; | |
1467 | struct sk_buff *skb = NULL; | |
1468 | uint16_t tt_tot, tt_count; | |
96412690 | 1469 | ssize_t tt_query_size = sizeof(struct batadv_tt_query_packet); |
c90681b8 | 1470 | uint32_t i; |
96412690 | 1471 | size_t len; |
a73105b8 AQ |
1472 | |
1473 | if (tt_query_size + tt_len > primary_if->soft_iface->mtu) { | |
1474 | tt_len = primary_if->soft_iface->mtu - tt_query_size; | |
96412690 | 1475 | tt_len -= tt_len % sizeof(struct batadv_tt_change); |
a73105b8 | 1476 | } |
96412690 | 1477 | tt_tot = tt_len / sizeof(struct batadv_tt_change); |
a73105b8 | 1478 | |
96412690 SE |
1479 | len = tt_query_size + tt_len; |
1480 | skb = dev_alloc_skb(len + ETH_HLEN); | |
a73105b8 AQ |
1481 | if (!skb) |
1482 | goto out; | |
1483 | ||
1484 | skb_reserve(skb, ETH_HLEN); | |
96412690 | 1485 | tt_response = (struct batadv_tt_query_packet *)skb_put(skb, len); |
a73105b8 | 1486 | tt_response->ttvn = ttvn; |
a73105b8 | 1487 | |
96412690 | 1488 | tt_change = (struct batadv_tt_change *)(skb->data + tt_query_size); |
a73105b8 AQ |
1489 | tt_count = 0; |
1490 | ||
1491 | rcu_read_lock(); | |
1492 | for (i = 0; i < hash->size; i++) { | |
1493 | head = &hash->table[i]; | |
1494 | ||
48100bac | 1495 | hlist_for_each_entry_rcu(tt_common_entry, node, |
a73105b8 AQ |
1496 | head, hash_entry) { |
1497 | if (tt_count == tt_tot) | |
1498 | break; | |
1499 | ||
48100bac | 1500 | if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data))) |
a73105b8 AQ |
1501 | continue; |
1502 | ||
48100bac AQ |
1503 | memcpy(tt_change->addr, tt_common_entry->addr, |
1504 | ETH_ALEN); | |
42d0b044 | 1505 | tt_change->flags = BATADV_NO_FLAGS; |
a73105b8 AQ |
1506 | |
1507 | tt_count++; | |
1508 | tt_change++; | |
1509 | } | |
1510 | } | |
1511 | rcu_read_unlock(); | |
1512 | ||
9d852393 | 1513 | /* store in the message the number of entries we have successfully |
9cfc7bd6 SE |
1514 | * copied |
1515 | */ | |
9d852393 AQ |
1516 | tt_response->tt_data = htons(tt_count); |
1517 | ||
a73105b8 AQ |
1518 | out: |
1519 | return skb; | |
1520 | } | |
1521 | ||
56303d34 SE |
1522 | static int batadv_send_tt_request(struct batadv_priv *bat_priv, |
1523 | struct batadv_orig_node *dst_orig_node, | |
a513088d SE |
1524 | uint8_t ttvn, uint16_t tt_crc, |
1525 | bool full_table) | |
a73105b8 AQ |
1526 | { |
1527 | struct sk_buff *skb = NULL; | |
96412690 | 1528 | struct batadv_tt_query_packet *tt_request; |
56303d34 SE |
1529 | struct batadv_neigh_node *neigh_node = NULL; |
1530 | struct batadv_hard_iface *primary_if; | |
1531 | struct batadv_tt_req_node *tt_req_node = NULL; | |
a73105b8 | 1532 | int ret = 1; |
96412690 | 1533 | size_t tt_req_len; |
a73105b8 | 1534 | |
e5d89254 | 1535 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1536 | if (!primary_if) |
1537 | goto out; | |
1538 | ||
1539 | /* The new tt_req will be issued only if I'm not waiting for a | |
9cfc7bd6 SE |
1540 | * reply from the same orig_node yet |
1541 | */ | |
a513088d | 1542 | tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node); |
a73105b8 AQ |
1543 | if (!tt_req_node) |
1544 | goto out; | |
1545 | ||
96412690 | 1546 | skb = dev_alloc_skb(sizeof(*tt_request) + ETH_HLEN); |
a73105b8 AQ |
1547 | if (!skb) |
1548 | goto out; | |
1549 | ||
1550 | skb_reserve(skb, ETH_HLEN); | |
1551 | ||
96412690 SE |
1552 | tt_req_len = sizeof(*tt_request); |
1553 | tt_request = (struct batadv_tt_query_packet *)skb_put(skb, tt_req_len); | |
a73105b8 | 1554 | |
acd34afa | 1555 | tt_request->header.packet_type = BATADV_TT_QUERY; |
7e071c79 | 1556 | tt_request->header.version = BATADV_COMPAT_VERSION; |
a73105b8 AQ |
1557 | memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1558 | memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN); | |
42d0b044 | 1559 | tt_request->header.ttl = BATADV_TTL; |
a73105b8 | 1560 | tt_request->ttvn = ttvn; |
6d2003fc | 1561 | tt_request->tt_data = htons(tt_crc); |
acd34afa | 1562 | tt_request->flags = BATADV_TT_REQUEST; |
a73105b8 AQ |
1563 | |
1564 | if (full_table) | |
acd34afa | 1565 | tt_request->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1566 | |
7d211efc | 1567 | neigh_node = batadv_orig_node_get_router(dst_orig_node); |
a73105b8 AQ |
1568 | if (!neigh_node) |
1569 | goto out; | |
1570 | ||
39c75a51 | 1571 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1572 | "Sending TT_REQUEST to %pM via %pM [%c]\n", |
1573 | dst_orig_node->orig, neigh_node->addr, | |
1574 | (full_table ? 'F' : '.')); | |
a73105b8 | 1575 | |
d69909d2 | 1576 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX); |
f8214865 | 1577 | |
9455e34c | 1578 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1579 | ret = 0; |
1580 | ||
1581 | out: | |
1582 | if (neigh_node) | |
7d211efc | 1583 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1584 | if (primary_if) |
e5d89254 | 1585 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1586 | if (ret) |
1587 | kfree_skb(skb); | |
1588 | if (ret && tt_req_node) { | |
807736f6 | 1589 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 | 1590 | list_del(&tt_req_node->list); |
807736f6 | 1591 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
1592 | kfree(tt_req_node); |
1593 | } | |
1594 | return ret; | |
1595 | } | |
1596 | ||
96412690 | 1597 | static bool |
56303d34 | 1598 | batadv_send_other_tt_response(struct batadv_priv *bat_priv, |
96412690 | 1599 | struct batadv_tt_query_packet *tt_request) |
a73105b8 | 1600 | { |
56303d34 SE |
1601 | struct batadv_orig_node *req_dst_orig_node = NULL; |
1602 | struct batadv_orig_node *res_dst_orig_node = NULL; | |
1603 | struct batadv_neigh_node *neigh_node = NULL; | |
1604 | struct batadv_hard_iface *primary_if = NULL; | |
a73105b8 AQ |
1605 | uint8_t orig_ttvn, req_ttvn, ttvn; |
1606 | int ret = false; | |
1607 | unsigned char *tt_buff; | |
1608 | bool full_table; | |
1609 | uint16_t tt_len, tt_tot; | |
1610 | struct sk_buff *skb = NULL; | |
96412690 | 1611 | struct batadv_tt_query_packet *tt_response; |
c67893d1 | 1612 | uint8_t *packet_pos; |
96412690 | 1613 | size_t len; |
a73105b8 | 1614 | |
39c75a51 | 1615 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1616 | "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", |
1617 | tt_request->src, tt_request->ttvn, tt_request->dst, | |
acd34afa | 1618 | (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 AQ |
1619 | |
1620 | /* Let's get the orig node of the REAL destination */ | |
da641193 | 1621 | req_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->dst); |
a73105b8 AQ |
1622 | if (!req_dst_orig_node) |
1623 | goto out; | |
1624 | ||
da641193 | 1625 | res_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1626 | if (!res_dst_orig_node) |
1627 | goto out; | |
1628 | ||
7d211efc | 1629 | neigh_node = batadv_orig_node_get_router(res_dst_orig_node); |
a73105b8 AQ |
1630 | if (!neigh_node) |
1631 | goto out; | |
1632 | ||
e5d89254 | 1633 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1634 | if (!primary_if) |
1635 | goto out; | |
1636 | ||
1637 | orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); | |
1638 | req_ttvn = tt_request->ttvn; | |
1639 | ||
015758d0 | 1640 | /* I don't have the requested data */ |
a73105b8 | 1641 | if (orig_ttvn != req_ttvn || |
f25bd58a | 1642 | tt_request->tt_data != htons(req_dst_orig_node->tt_crc)) |
a73105b8 AQ |
1643 | goto out; |
1644 | ||
015758d0 | 1645 | /* If the full table has been explicitly requested */ |
acd34afa | 1646 | if (tt_request->flags & BATADV_TT_FULL_TABLE || |
a73105b8 AQ |
1647 | !req_dst_orig_node->tt_buff) |
1648 | full_table = true; | |
1649 | else | |
1650 | full_table = false; | |
1651 | ||
1652 | /* In this version, fragmentation is not implemented, then | |
9cfc7bd6 SE |
1653 | * I'll send only one packet with as much TT entries as I can |
1654 | */ | |
a73105b8 AQ |
1655 | if (!full_table) { |
1656 | spin_lock_bh(&req_dst_orig_node->tt_buff_lock); | |
1657 | tt_len = req_dst_orig_node->tt_buff_len; | |
96412690 | 1658 | tt_tot = tt_len / sizeof(struct batadv_tt_change); |
a73105b8 | 1659 | |
96412690 SE |
1660 | len = sizeof(*tt_response) + tt_len; |
1661 | skb = dev_alloc_skb(len + ETH_HLEN); | |
a73105b8 AQ |
1662 | if (!skb) |
1663 | goto unlock; | |
1664 | ||
1665 | skb_reserve(skb, ETH_HLEN); | |
c67893d1 SE |
1666 | packet_pos = skb_put(skb, len); |
1667 | tt_response = (struct batadv_tt_query_packet *)packet_pos; | |
a73105b8 AQ |
1668 | tt_response->ttvn = req_ttvn; |
1669 | tt_response->tt_data = htons(tt_tot); | |
1670 | ||
96412690 | 1671 | tt_buff = skb->data + sizeof(*tt_response); |
a73105b8 AQ |
1672 | /* Copy the last orig_node's OGM buffer */ |
1673 | memcpy(tt_buff, req_dst_orig_node->tt_buff, | |
1674 | req_dst_orig_node->tt_buff_len); | |
1675 | ||
1676 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1677 | } else { | |
96412690 SE |
1678 | tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size); |
1679 | tt_len *= sizeof(struct batadv_tt_change); | |
a73105b8 AQ |
1680 | ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); |
1681 | ||
a513088d | 1682 | skb = batadv_tt_response_fill_table(tt_len, ttvn, |
807736f6 | 1683 | bat_priv->tt.global_hash, |
a513088d SE |
1684 | primary_if, |
1685 | batadv_tt_global_valid, | |
1686 | req_dst_orig_node); | |
a73105b8 AQ |
1687 | if (!skb) |
1688 | goto out; | |
1689 | ||
96412690 | 1690 | tt_response = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 AQ |
1691 | } |
1692 | ||
acd34afa | 1693 | tt_response->header.packet_type = BATADV_TT_QUERY; |
7e071c79 | 1694 | tt_response->header.version = BATADV_COMPAT_VERSION; |
42d0b044 | 1695 | tt_response->header.ttl = BATADV_TTL; |
a73105b8 AQ |
1696 | memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN); |
1697 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
acd34afa | 1698 | tt_response->flags = BATADV_TT_RESPONSE; |
a73105b8 AQ |
1699 | |
1700 | if (full_table) | |
acd34afa | 1701 | tt_response->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1702 | |
39c75a51 | 1703 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1704 | "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n", |
1705 | res_dst_orig_node->orig, neigh_node->addr, | |
1706 | req_dst_orig_node->orig, req_ttvn); | |
a73105b8 | 1707 | |
d69909d2 | 1708 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); |
f8214865 | 1709 | |
9455e34c | 1710 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1711 | ret = true; |
1712 | goto out; | |
1713 | ||
1714 | unlock: | |
1715 | spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); | |
1716 | ||
1717 | out: | |
1718 | if (res_dst_orig_node) | |
7d211efc | 1719 | batadv_orig_node_free_ref(res_dst_orig_node); |
a73105b8 | 1720 | if (req_dst_orig_node) |
7d211efc | 1721 | batadv_orig_node_free_ref(req_dst_orig_node); |
a73105b8 | 1722 | if (neigh_node) |
7d211efc | 1723 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1724 | if (primary_if) |
e5d89254 | 1725 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1726 | if (!ret) |
1727 | kfree_skb(skb); | |
1728 | return ret; | |
1729 | ||
1730 | } | |
96412690 SE |
1731 | |
1732 | static bool | |
56303d34 | 1733 | batadv_send_my_tt_response(struct batadv_priv *bat_priv, |
96412690 | 1734 | struct batadv_tt_query_packet *tt_request) |
a73105b8 | 1735 | { |
56303d34 SE |
1736 | struct batadv_orig_node *orig_node = NULL; |
1737 | struct batadv_neigh_node *neigh_node = NULL; | |
1738 | struct batadv_hard_iface *primary_if = NULL; | |
a73105b8 AQ |
1739 | uint8_t my_ttvn, req_ttvn, ttvn; |
1740 | int ret = false; | |
1741 | unsigned char *tt_buff; | |
1742 | bool full_table; | |
1743 | uint16_t tt_len, tt_tot; | |
1744 | struct sk_buff *skb = NULL; | |
96412690 | 1745 | struct batadv_tt_query_packet *tt_response; |
c67893d1 | 1746 | uint8_t *packet_pos; |
96412690 | 1747 | size_t len; |
a73105b8 | 1748 | |
39c75a51 | 1749 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1750 | "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", |
1751 | tt_request->src, tt_request->ttvn, | |
acd34afa | 1752 | (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 AQ |
1753 | |
1754 | ||
807736f6 | 1755 | my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); |
a73105b8 AQ |
1756 | req_ttvn = tt_request->ttvn; |
1757 | ||
da641193 | 1758 | orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); |
a73105b8 AQ |
1759 | if (!orig_node) |
1760 | goto out; | |
1761 | ||
7d211efc | 1762 | neigh_node = batadv_orig_node_get_router(orig_node); |
a73105b8 AQ |
1763 | if (!neigh_node) |
1764 | goto out; | |
1765 | ||
e5d89254 | 1766 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
1767 | if (!primary_if) |
1768 | goto out; | |
1769 | ||
1770 | /* If the full table has been explicitly requested or the gap | |
9cfc7bd6 SE |
1771 | * is too big send the whole local translation table |
1772 | */ | |
acd34afa | 1773 | if (tt_request->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn || |
807736f6 | 1774 | !bat_priv->tt.last_changeset) |
a73105b8 AQ |
1775 | full_table = true; |
1776 | else | |
1777 | full_table = false; | |
1778 | ||
1779 | /* In this version, fragmentation is not implemented, then | |
9cfc7bd6 SE |
1780 | * I'll send only one packet with as much TT entries as I can |
1781 | */ | |
a73105b8 | 1782 | if (!full_table) { |
807736f6 SE |
1783 | spin_lock_bh(&bat_priv->tt.last_changeset_lock); |
1784 | tt_len = bat_priv->tt.last_changeset_len; | |
96412690 | 1785 | tt_tot = tt_len / sizeof(struct batadv_tt_change); |
a73105b8 | 1786 | |
96412690 SE |
1787 | len = sizeof(*tt_response) + tt_len; |
1788 | skb = dev_alloc_skb(len + ETH_HLEN); | |
a73105b8 AQ |
1789 | if (!skb) |
1790 | goto unlock; | |
1791 | ||
1792 | skb_reserve(skb, ETH_HLEN); | |
c67893d1 SE |
1793 | packet_pos = skb_put(skb, len); |
1794 | tt_response = (struct batadv_tt_query_packet *)packet_pos; | |
a73105b8 AQ |
1795 | tt_response->ttvn = req_ttvn; |
1796 | tt_response->tt_data = htons(tt_tot); | |
1797 | ||
96412690 | 1798 | tt_buff = skb->data + sizeof(*tt_response); |
807736f6 SE |
1799 | memcpy(tt_buff, bat_priv->tt.last_changeset, |
1800 | bat_priv->tt.last_changeset_len); | |
1801 | spin_unlock_bh(&bat_priv->tt.last_changeset_lock); | |
a73105b8 | 1802 | } else { |
807736f6 | 1803 | tt_len = (uint16_t)atomic_read(&bat_priv->tt.local_entry_num); |
96412690 | 1804 | tt_len *= sizeof(struct batadv_tt_change); |
807736f6 | 1805 | ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); |
a73105b8 | 1806 | |
a513088d | 1807 | skb = batadv_tt_response_fill_table(tt_len, ttvn, |
807736f6 | 1808 | bat_priv->tt.local_hash, |
a513088d SE |
1809 | primary_if, |
1810 | batadv_tt_local_valid_entry, | |
1811 | NULL); | |
a73105b8 AQ |
1812 | if (!skb) |
1813 | goto out; | |
1814 | ||
96412690 | 1815 | tt_response = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 AQ |
1816 | } |
1817 | ||
acd34afa | 1818 | tt_response->header.packet_type = BATADV_TT_QUERY; |
7e071c79 | 1819 | tt_response->header.version = BATADV_COMPAT_VERSION; |
42d0b044 | 1820 | tt_response->header.ttl = BATADV_TTL; |
a73105b8 AQ |
1821 | memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
1822 | memcpy(tt_response->dst, tt_request->src, ETH_ALEN); | |
acd34afa | 1823 | tt_response->flags = BATADV_TT_RESPONSE; |
a73105b8 AQ |
1824 | |
1825 | if (full_table) | |
acd34afa | 1826 | tt_response->flags |= BATADV_TT_FULL_TABLE; |
a73105b8 | 1827 | |
39c75a51 | 1828 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1829 | "Sending TT_RESPONSE to %pM via %pM [%c]\n", |
1830 | orig_node->orig, neigh_node->addr, | |
acd34afa | 1831 | (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 | 1832 | |
d69909d2 | 1833 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); |
f8214865 | 1834 | |
9455e34c | 1835 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
a73105b8 AQ |
1836 | ret = true; |
1837 | goto out; | |
1838 | ||
1839 | unlock: | |
807736f6 | 1840 | spin_unlock_bh(&bat_priv->tt.last_changeset_lock); |
a73105b8 AQ |
1841 | out: |
1842 | if (orig_node) | |
7d211efc | 1843 | batadv_orig_node_free_ref(orig_node); |
a73105b8 | 1844 | if (neigh_node) |
7d211efc | 1845 | batadv_neigh_node_free_ref(neigh_node); |
a73105b8 | 1846 | if (primary_if) |
e5d89254 | 1847 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
1848 | if (!ret) |
1849 | kfree_skb(skb); | |
1850 | /* This packet was for me, so it doesn't need to be re-routed */ | |
1851 | return true; | |
1852 | } | |
1853 | ||
56303d34 | 1854 | bool batadv_send_tt_response(struct batadv_priv *bat_priv, |
96412690 | 1855 | struct batadv_tt_query_packet *tt_request) |
a73105b8 | 1856 | { |
3193e8fd | 1857 | if (batadv_is_my_mac(tt_request->dst)) { |
20ff9d59 | 1858 | /* don't answer backbone gws! */ |
08adf151 | 1859 | if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src)) |
20ff9d59 SW |
1860 | return true; |
1861 | ||
a513088d | 1862 | return batadv_send_my_tt_response(bat_priv, tt_request); |
20ff9d59 | 1863 | } else { |
a513088d | 1864 | return batadv_send_other_tt_response(bat_priv, tt_request); |
20ff9d59 | 1865 | } |
a73105b8 AQ |
1866 | } |
1867 | ||
56303d34 SE |
1868 | static void _batadv_tt_update_changes(struct batadv_priv *bat_priv, |
1869 | struct batadv_orig_node *orig_node, | |
96412690 | 1870 | struct batadv_tt_change *tt_change, |
a513088d | 1871 | uint16_t tt_num_changes, uint8_t ttvn) |
a73105b8 AQ |
1872 | { |
1873 | int i; | |
a513088d | 1874 | int roams; |
a73105b8 AQ |
1875 | |
1876 | for (i = 0; i < tt_num_changes; i++) { | |
acd34afa SE |
1877 | if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) { |
1878 | roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM; | |
a513088d SE |
1879 | batadv_tt_global_del(bat_priv, orig_node, |
1880 | (tt_change + i)->addr, | |
d4f44692 AQ |
1881 | "tt removed by changes", |
1882 | roams); | |
08c36d3e | 1883 | } else { |
08c36d3e | 1884 | if (!batadv_tt_global_add(bat_priv, orig_node, |
d4f44692 AQ |
1885 | (tt_change + i)->addr, |
1886 | (tt_change + i)->flags, ttvn)) | |
a73105b8 AQ |
1887 | /* In case of problem while storing a |
1888 | * global_entry, we stop the updating | |
1889 | * procedure without committing the | |
1890 | * ttvn change. This will avoid to send | |
1891 | * corrupted data on tt_request | |
1892 | */ | |
1893 | return; | |
08c36d3e | 1894 | } |
a73105b8 | 1895 | } |
17071578 | 1896 | orig_node->tt_initialised = true; |
a73105b8 AQ |
1897 | } |
1898 | ||
56303d34 | 1899 | static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv, |
96412690 | 1900 | struct batadv_tt_query_packet *tt_response) |
a73105b8 | 1901 | { |
56303d34 | 1902 | struct batadv_orig_node *orig_node = NULL; |
a73105b8 | 1903 | |
da641193 | 1904 | orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); |
a73105b8 AQ |
1905 | if (!orig_node) |
1906 | goto out; | |
1907 | ||
1908 | /* Purge the old table first.. */ | |
08c36d3e | 1909 | batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table"); |
a73105b8 | 1910 | |
a513088d | 1911 | _batadv_tt_update_changes(bat_priv, orig_node, |
96412690 | 1912 | (struct batadv_tt_change *)(tt_response + 1), |
a513088d SE |
1913 | ntohs(tt_response->tt_data), |
1914 | tt_response->ttvn); | |
a73105b8 AQ |
1915 | |
1916 | spin_lock_bh(&orig_node->tt_buff_lock); | |
1917 | kfree(orig_node->tt_buff); | |
1918 | orig_node->tt_buff_len = 0; | |
1919 | orig_node->tt_buff = NULL; | |
1920 | spin_unlock_bh(&orig_node->tt_buff_lock); | |
1921 | ||
1922 | atomic_set(&orig_node->last_ttvn, tt_response->ttvn); | |
1923 | ||
1924 | out: | |
1925 | if (orig_node) | |
7d211efc | 1926 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
1927 | } |
1928 | ||
56303d34 SE |
1929 | static void batadv_tt_update_changes(struct batadv_priv *bat_priv, |
1930 | struct batadv_orig_node *orig_node, | |
a513088d | 1931 | uint16_t tt_num_changes, uint8_t ttvn, |
96412690 | 1932 | struct batadv_tt_change *tt_change) |
a73105b8 | 1933 | { |
a513088d SE |
1934 | _batadv_tt_update_changes(bat_priv, orig_node, tt_change, |
1935 | tt_num_changes, ttvn); | |
a73105b8 | 1936 | |
a513088d SE |
1937 | batadv_tt_save_orig_buffer(bat_priv, orig_node, |
1938 | (unsigned char *)tt_change, tt_num_changes); | |
a73105b8 AQ |
1939 | atomic_set(&orig_node->last_ttvn, ttvn); |
1940 | } | |
1941 | ||
56303d34 | 1942 | bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr) |
a73105b8 | 1943 | { |
56303d34 | 1944 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
7683fdc1 | 1945 | bool ret = false; |
a73105b8 | 1946 | |
a513088d | 1947 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); |
7683fdc1 AQ |
1948 | if (!tt_local_entry) |
1949 | goto out; | |
058d0e26 | 1950 | /* Check if the client has been logically deleted (but is kept for |
9cfc7bd6 SE |
1951 | * consistency purpose) |
1952 | */ | |
acd34afa | 1953 | if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) |
058d0e26 | 1954 | goto out; |
7683fdc1 AQ |
1955 | ret = true; |
1956 | out: | |
a73105b8 | 1957 | if (tt_local_entry) |
a513088d | 1958 | batadv_tt_local_entry_free_ref(tt_local_entry); |
7683fdc1 | 1959 | return ret; |
a73105b8 AQ |
1960 | } |
1961 | ||
56303d34 | 1962 | void batadv_handle_tt_response(struct batadv_priv *bat_priv, |
96412690 | 1963 | struct batadv_tt_query_packet *tt_response) |
a73105b8 | 1964 | { |
56303d34 SE |
1965 | struct batadv_tt_req_node *node, *safe; |
1966 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1967 | struct batadv_tt_change *tt_change; |
a73105b8 | 1968 | |
39c75a51 | 1969 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
1970 | "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", |
1971 | tt_response->src, tt_response->ttvn, | |
1972 | ntohs(tt_response->tt_data), | |
acd34afa | 1973 | (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); |
a73105b8 | 1974 | |
20ff9d59 | 1975 | /* we should have never asked a backbone gw */ |
08adf151 | 1976 | if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src)) |
20ff9d59 SW |
1977 | goto out; |
1978 | ||
da641193 | 1979 | orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); |
a73105b8 AQ |
1980 | if (!orig_node) |
1981 | goto out; | |
1982 | ||
96412690 | 1983 | if (tt_response->flags & BATADV_TT_FULL_TABLE) { |
a513088d | 1984 | batadv_tt_fill_gtable(bat_priv, tt_response); |
96412690 SE |
1985 | } else { |
1986 | tt_change = (struct batadv_tt_change *)(tt_response + 1); | |
a513088d SE |
1987 | batadv_tt_update_changes(bat_priv, orig_node, |
1988 | ntohs(tt_response->tt_data), | |
96412690 SE |
1989 | tt_response->ttvn, tt_change); |
1990 | } | |
a73105b8 AQ |
1991 | |
1992 | /* Delete the tt_req_node from pending tt_requests list */ | |
807736f6 SE |
1993 | spin_lock_bh(&bat_priv->tt.req_list_lock); |
1994 | list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { | |
1eda58bf | 1995 | if (!batadv_compare_eth(node->addr, tt_response->src)) |
a73105b8 AQ |
1996 | continue; |
1997 | list_del(&node->list); | |
1998 | kfree(node); | |
1999 | } | |
807736f6 | 2000 | spin_unlock_bh(&bat_priv->tt.req_list_lock); |
a73105b8 AQ |
2001 | |
2002 | /* Recalculate the CRC for this orig_node and store it */ | |
a513088d | 2003 | orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); |
cc47f66e | 2004 | /* Roaming phase is over: tables are in sync again. I can |
9cfc7bd6 SE |
2005 | * unset the flag |
2006 | */ | |
cc47f66e | 2007 | orig_node->tt_poss_change = false; |
a73105b8 AQ |
2008 | out: |
2009 | if (orig_node) | |
7d211efc | 2010 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
2011 | } |
2012 | ||
56303d34 | 2013 | int batadv_tt_init(struct batadv_priv *bat_priv) |
a73105b8 | 2014 | { |
5346c35e | 2015 | int ret; |
a73105b8 | 2016 | |
a513088d | 2017 | ret = batadv_tt_local_init(bat_priv); |
5346c35e SE |
2018 | if (ret < 0) |
2019 | return ret; | |
2020 | ||
a513088d | 2021 | ret = batadv_tt_global_init(bat_priv); |
5346c35e SE |
2022 | if (ret < 0) |
2023 | return ret; | |
a73105b8 | 2024 | |
a513088d | 2025 | batadv_tt_start_timer(bat_priv); |
a73105b8 AQ |
2026 | |
2027 | return 1; | |
2028 | } | |
2029 | ||
56303d34 | 2030 | static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv) |
a73105b8 | 2031 | { |
56303d34 | 2032 | struct batadv_tt_roam_node *node, *safe; |
a73105b8 | 2033 | |
807736f6 | 2034 | spin_lock_bh(&bat_priv->tt.roam_list_lock); |
a73105b8 | 2035 | |
807736f6 | 2036 | list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { |
cc47f66e AQ |
2037 | list_del(&node->list); |
2038 | kfree(node); | |
2039 | } | |
2040 | ||
807736f6 | 2041 | spin_unlock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e AQ |
2042 | } |
2043 | ||
56303d34 | 2044 | static void batadv_tt_roam_purge(struct batadv_priv *bat_priv) |
cc47f66e | 2045 | { |
56303d34 | 2046 | struct batadv_tt_roam_node *node, *safe; |
cc47f66e | 2047 | |
807736f6 SE |
2048 | spin_lock_bh(&bat_priv->tt.roam_list_lock); |
2049 | list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { | |
42d0b044 SE |
2050 | if (!batadv_has_timed_out(node->first_time, |
2051 | BATADV_ROAMING_MAX_TIME)) | |
cc47f66e AQ |
2052 | continue; |
2053 | ||
2054 | list_del(&node->list); | |
2055 | kfree(node); | |
2056 | } | |
807736f6 | 2057 | spin_unlock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e AQ |
2058 | } |
2059 | ||
2060 | /* This function checks whether the client already reached the | |
2061 | * maximum number of possible roaming phases. In this case the ROAMING_ADV | |
2062 | * will not be sent. | |
2063 | * | |
9cfc7bd6 SE |
2064 | * returns true if the ROAMING_ADV can be sent, false otherwise |
2065 | */ | |
56303d34 | 2066 | static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, |
a513088d | 2067 | uint8_t *client) |
cc47f66e | 2068 | { |
56303d34 | 2069 | struct batadv_tt_roam_node *tt_roam_node; |
cc47f66e AQ |
2070 | bool ret = false; |
2071 | ||
807736f6 | 2072 | spin_lock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e | 2073 | /* The new tt_req will be issued only if I'm not waiting for a |
9cfc7bd6 SE |
2074 | * reply from the same orig_node yet |
2075 | */ | |
807736f6 | 2076 | list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) { |
1eda58bf | 2077 | if (!batadv_compare_eth(tt_roam_node->addr, client)) |
cc47f66e AQ |
2078 | continue; |
2079 | ||
1eda58bf | 2080 | if (batadv_has_timed_out(tt_roam_node->first_time, |
42d0b044 | 2081 | BATADV_ROAMING_MAX_TIME)) |
cc47f66e AQ |
2082 | continue; |
2083 | ||
3e34819e | 2084 | if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter)) |
cc47f66e AQ |
2085 | /* Sorry, you roamed too many times! */ |
2086 | goto unlock; | |
2087 | ret = true; | |
2088 | break; | |
2089 | } | |
2090 | ||
2091 | if (!ret) { | |
2092 | tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); | |
2093 | if (!tt_roam_node) | |
2094 | goto unlock; | |
2095 | ||
2096 | tt_roam_node->first_time = jiffies; | |
42d0b044 SE |
2097 | atomic_set(&tt_roam_node->counter, |
2098 | BATADV_ROAMING_MAX_COUNT - 1); | |
cc47f66e AQ |
2099 | memcpy(tt_roam_node->addr, client, ETH_ALEN); |
2100 | ||
807736f6 | 2101 | list_add(&tt_roam_node->list, &bat_priv->tt.roam_list); |
cc47f66e AQ |
2102 | ret = true; |
2103 | } | |
2104 | ||
2105 | unlock: | |
807736f6 | 2106 | spin_unlock_bh(&bat_priv->tt.roam_list_lock); |
cc47f66e AQ |
2107 | return ret; |
2108 | } | |
2109 | ||
56303d34 SE |
2110 | static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, |
2111 | struct batadv_orig_node *orig_node) | |
cc47f66e | 2112 | { |
56303d34 | 2113 | struct batadv_neigh_node *neigh_node = NULL; |
cc47f66e | 2114 | struct sk_buff *skb = NULL; |
96412690 | 2115 | struct batadv_roam_adv_packet *roam_adv_packet; |
cc47f66e | 2116 | int ret = 1; |
56303d34 | 2117 | struct batadv_hard_iface *primary_if; |
96412690 | 2118 | size_t len = sizeof(*roam_adv_packet); |
cc47f66e AQ |
2119 | |
2120 | /* before going on we have to check whether the client has | |
9cfc7bd6 SE |
2121 | * already roamed to us too many times |
2122 | */ | |
a513088d | 2123 | if (!batadv_tt_check_roam_count(bat_priv, client)) |
cc47f66e AQ |
2124 | goto out; |
2125 | ||
96412690 | 2126 | skb = dev_alloc_skb(sizeof(*roam_adv_packet) + ETH_HLEN); |
cc47f66e AQ |
2127 | if (!skb) |
2128 | goto out; | |
2129 | ||
2130 | skb_reserve(skb, ETH_HLEN); | |
2131 | ||
96412690 | 2132 | roam_adv_packet = (struct batadv_roam_adv_packet *)skb_put(skb, len); |
cc47f66e | 2133 | |
acd34afa | 2134 | roam_adv_packet->header.packet_type = BATADV_ROAM_ADV; |
7e071c79 | 2135 | roam_adv_packet->header.version = BATADV_COMPAT_VERSION; |
42d0b044 | 2136 | roam_adv_packet->header.ttl = BATADV_TTL; |
162d549c | 2137 | roam_adv_packet->reserved = 0; |
e5d89254 | 2138 | primary_if = batadv_primary_if_get_selected(bat_priv); |
cc47f66e AQ |
2139 | if (!primary_if) |
2140 | goto out; | |
2141 | memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN); | |
e5d89254 | 2142 | batadv_hardif_free_ref(primary_if); |
cc47f66e AQ |
2143 | memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN); |
2144 | memcpy(roam_adv_packet->client, client, ETH_ALEN); | |
2145 | ||
7d211efc | 2146 | neigh_node = batadv_orig_node_get_router(orig_node); |
cc47f66e AQ |
2147 | if (!neigh_node) |
2148 | goto out; | |
2149 | ||
39c75a51 | 2150 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
2151 | "Sending ROAMING_ADV to %pM (client %pM) via %pM\n", |
2152 | orig_node->orig, client, neigh_node->addr); | |
cc47f66e | 2153 | |
d69909d2 | 2154 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX); |
f8214865 | 2155 | |
9455e34c | 2156 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
cc47f66e AQ |
2157 | ret = 0; |
2158 | ||
2159 | out: | |
2160 | if (neigh_node) | |
7d211efc | 2161 | batadv_neigh_node_free_ref(neigh_node); |
cc47f66e AQ |
2162 | if (ret) |
2163 | kfree_skb(skb); | |
2164 | return; | |
a73105b8 AQ |
2165 | } |
2166 | ||
a513088d | 2167 | static void batadv_tt_purge(struct work_struct *work) |
a73105b8 | 2168 | { |
56303d34 | 2169 | struct delayed_work *delayed_work; |
807736f6 | 2170 | struct batadv_priv_tt *priv_tt; |
56303d34 SE |
2171 | struct batadv_priv *bat_priv; |
2172 | ||
2173 | delayed_work = container_of(work, struct delayed_work, work); | |
807736f6 SE |
2174 | priv_tt = container_of(delayed_work, struct batadv_priv_tt, work); |
2175 | bat_priv = container_of(priv_tt, struct batadv_priv, tt); | |
a73105b8 | 2176 | |
a513088d | 2177 | batadv_tt_local_purge(bat_priv); |
30cfd02b | 2178 | batadv_tt_global_purge(bat_priv); |
a513088d SE |
2179 | batadv_tt_req_purge(bat_priv); |
2180 | batadv_tt_roam_purge(bat_priv); | |
a73105b8 | 2181 | |
a513088d | 2182 | batadv_tt_start_timer(bat_priv); |
a73105b8 | 2183 | } |
cc47f66e | 2184 | |
56303d34 | 2185 | void batadv_tt_free(struct batadv_priv *bat_priv) |
cc47f66e | 2186 | { |
807736f6 | 2187 | cancel_delayed_work_sync(&bat_priv->tt.work); |
cc47f66e | 2188 | |
a513088d SE |
2189 | batadv_tt_local_table_free(bat_priv); |
2190 | batadv_tt_global_table_free(bat_priv); | |
2191 | batadv_tt_req_list_free(bat_priv); | |
2192 | batadv_tt_changes_list_free(bat_priv); | |
2193 | batadv_tt_roam_list_free(bat_priv); | |
cc47f66e | 2194 | |
807736f6 | 2195 | kfree(bat_priv->tt.last_changeset); |
cc47f66e | 2196 | } |
058d0e26 | 2197 | |
697f2531 | 2198 | /* This function will enable or disable the specified flags for all the entries |
9cfc7bd6 SE |
2199 | * in the given hash table and returns the number of modified entries |
2200 | */ | |
5bf74e9c SE |
2201 | static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash, |
2202 | uint16_t flags, bool enable) | |
058d0e26 | 2203 | { |
c90681b8 | 2204 | uint32_t i; |
697f2531 | 2205 | uint16_t changed_num = 0; |
058d0e26 AQ |
2206 | struct hlist_head *head; |
2207 | struct hlist_node *node; | |
56303d34 | 2208 | struct batadv_tt_common_entry *tt_common_entry; |
058d0e26 AQ |
2209 | |
2210 | if (!hash) | |
697f2531 | 2211 | goto out; |
058d0e26 AQ |
2212 | |
2213 | for (i = 0; i < hash->size; i++) { | |
2214 | head = &hash->table[i]; | |
2215 | ||
2216 | rcu_read_lock(); | |
48100bac | 2217 | hlist_for_each_entry_rcu(tt_common_entry, node, |
058d0e26 | 2218 | head, hash_entry) { |
697f2531 AQ |
2219 | if (enable) { |
2220 | if ((tt_common_entry->flags & flags) == flags) | |
2221 | continue; | |
2222 | tt_common_entry->flags |= flags; | |
2223 | } else { | |
2224 | if (!(tt_common_entry->flags & flags)) | |
2225 | continue; | |
2226 | tt_common_entry->flags &= ~flags; | |
2227 | } | |
2228 | changed_num++; | |
058d0e26 AQ |
2229 | } |
2230 | rcu_read_unlock(); | |
2231 | } | |
697f2531 AQ |
2232 | out: |
2233 | return changed_num; | |
058d0e26 AQ |
2234 | } |
2235 | ||
acd34afa | 2236 | /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */ |
56303d34 | 2237 | static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) |
058d0e26 | 2238 | { |
807736f6 | 2239 | struct batadv_hashtable *hash = bat_priv->tt.local_hash; |
56303d34 SE |
2240 | struct batadv_tt_common_entry *tt_common; |
2241 | struct batadv_tt_local_entry *tt_local; | |
058d0e26 AQ |
2242 | struct hlist_node *node, *node_tmp; |
2243 | struct hlist_head *head; | |
2244 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
c90681b8 | 2245 | uint32_t i; |
058d0e26 AQ |
2246 | |
2247 | if (!hash) | |
2248 | return; | |
2249 | ||
2250 | for (i = 0; i < hash->size; i++) { | |
2251 | head = &hash->table[i]; | |
2252 | list_lock = &hash->list_locks[i]; | |
2253 | ||
2254 | spin_lock_bh(list_lock); | |
acd34afa SE |
2255 | hlist_for_each_entry_safe(tt_common, node, node_tmp, head, |
2256 | hash_entry) { | |
2257 | if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING)) | |
058d0e26 AQ |
2258 | continue; |
2259 | ||
39c75a51 | 2260 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 2261 | "Deleting local tt entry (%pM): pending\n", |
acd34afa | 2262 | tt_common->addr); |
058d0e26 | 2263 | |
807736f6 | 2264 | atomic_dec(&bat_priv->tt.local_entry_num); |
058d0e26 | 2265 | hlist_del_rcu(node); |
56303d34 SE |
2266 | tt_local = container_of(tt_common, |
2267 | struct batadv_tt_local_entry, | |
2268 | common); | |
2269 | batadv_tt_local_entry_free_ref(tt_local); | |
058d0e26 AQ |
2270 | } |
2271 | spin_unlock_bh(list_lock); | |
2272 | } | |
2273 | ||
2274 | } | |
2275 | ||
56303d34 | 2276 | static int batadv_tt_commit_changes(struct batadv_priv *bat_priv, |
a513088d SE |
2277 | unsigned char **packet_buff, |
2278 | int *packet_buff_len, int packet_min_len) | |
058d0e26 | 2279 | { |
be9aa4c1 ML |
2280 | uint16_t changed_num = 0; |
2281 | ||
807736f6 | 2282 | if (atomic_read(&bat_priv->tt.local_changes) < 1) |
be9aa4c1 ML |
2283 | return -ENOENT; |
2284 | ||
807736f6 | 2285 | changed_num = batadv_tt_set_flags(bat_priv->tt.local_hash, |
acd34afa | 2286 | BATADV_TT_CLIENT_NEW, false); |
be9aa4c1 ML |
2287 | |
2288 | /* all reset entries have to be counted as local entries */ | |
807736f6 | 2289 | atomic_add(changed_num, &bat_priv->tt.local_entry_num); |
a513088d | 2290 | batadv_tt_local_purge_pending_clients(bat_priv); |
807736f6 | 2291 | bat_priv->tt.local_crc = batadv_tt_local_crc(bat_priv); |
058d0e26 AQ |
2292 | |
2293 | /* Increment the TTVN only once per OGM interval */ | |
807736f6 | 2294 | atomic_inc(&bat_priv->tt.vn); |
39c75a51 | 2295 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf | 2296 | "Local changes committed, updating to ttvn %u\n", |
807736f6 SE |
2297 | (uint8_t)atomic_read(&bat_priv->tt.vn)); |
2298 | bat_priv->tt.poss_change = false; | |
be9aa4c1 ML |
2299 | |
2300 | /* reset the sending counter */ | |
807736f6 | 2301 | atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX); |
be9aa4c1 | 2302 | |
a513088d SE |
2303 | return batadv_tt_changes_fill_buff(bat_priv, packet_buff, |
2304 | packet_buff_len, packet_min_len); | |
be9aa4c1 ML |
2305 | } |
2306 | ||
2307 | /* when calling this function (hard_iface == primary_if) has to be true */ | |
56303d34 | 2308 | int batadv_tt_append_diff(struct batadv_priv *bat_priv, |
be9aa4c1 ML |
2309 | unsigned char **packet_buff, int *packet_buff_len, |
2310 | int packet_min_len) | |
2311 | { | |
2312 | int tt_num_changes; | |
2313 | ||
2314 | /* if at least one change happened */ | |
a513088d SE |
2315 | tt_num_changes = batadv_tt_commit_changes(bat_priv, packet_buff, |
2316 | packet_buff_len, | |
2317 | packet_min_len); | |
be9aa4c1 ML |
2318 | |
2319 | /* if the changes have been sent often enough */ | |
2320 | if ((tt_num_changes < 0) && | |
807736f6 | 2321 | (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))) { |
a513088d SE |
2322 | batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, |
2323 | packet_min_len, packet_min_len); | |
be9aa4c1 ML |
2324 | tt_num_changes = 0; |
2325 | } | |
2326 | ||
2327 | return tt_num_changes; | |
058d0e26 | 2328 | } |
59b699cd | 2329 | |
56303d34 | 2330 | bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src, |
08c36d3e | 2331 | uint8_t *dst) |
59b699cd | 2332 | { |
56303d34 SE |
2333 | struct batadv_tt_local_entry *tt_local_entry = NULL; |
2334 | struct batadv_tt_global_entry *tt_global_entry = NULL; | |
5870adc6 | 2335 | bool ret = false; |
59b699cd AQ |
2336 | |
2337 | if (!atomic_read(&bat_priv->ap_isolation)) | |
5870adc6 | 2338 | goto out; |
59b699cd | 2339 | |
a513088d | 2340 | tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst); |
59b699cd AQ |
2341 | if (!tt_local_entry) |
2342 | goto out; | |
2343 | ||
a513088d | 2344 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, src); |
59b699cd AQ |
2345 | if (!tt_global_entry) |
2346 | goto out; | |
2347 | ||
1f129fef | 2348 | if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) |
59b699cd AQ |
2349 | goto out; |
2350 | ||
5870adc6 | 2351 | ret = true; |
59b699cd AQ |
2352 | |
2353 | out: | |
2354 | if (tt_global_entry) | |
a513088d | 2355 | batadv_tt_global_entry_free_ref(tt_global_entry); |
59b699cd | 2356 | if (tt_local_entry) |
a513088d | 2357 | batadv_tt_local_entry_free_ref(tt_local_entry); |
59b699cd AQ |
2358 | return ret; |
2359 | } | |
a943cac1 | 2360 | |
56303d34 SE |
2361 | void batadv_tt_update_orig(struct batadv_priv *bat_priv, |
2362 | struct batadv_orig_node *orig_node, | |
08c36d3e SE |
2363 | const unsigned char *tt_buff, uint8_t tt_num_changes, |
2364 | uint8_t ttvn, uint16_t tt_crc) | |
a943cac1 ML |
2365 | { |
2366 | uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
2367 | bool full_table = true; | |
96412690 | 2368 | struct batadv_tt_change *tt_change; |
a943cac1 | 2369 | |
20ff9d59 | 2370 | /* don't care about a backbone gateways updates. */ |
08adf151 | 2371 | if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) |
20ff9d59 SW |
2372 | return; |
2373 | ||
17071578 | 2374 | /* orig table not initialised AND first diff is in the OGM OR the ttvn |
9cfc7bd6 SE |
2375 | * increased by one -> we can apply the attached changes |
2376 | */ | |
17071578 AQ |
2377 | if ((!orig_node->tt_initialised && ttvn == 1) || |
2378 | ttvn - orig_ttvn == 1) { | |
a943cac1 | 2379 | /* the OGM could not contain the changes due to their size or |
42d0b044 SE |
2380 | * because they have already been sent BATADV_TT_OGM_APPEND_MAX |
2381 | * times. | |
9cfc7bd6 SE |
2382 | * In this case send a tt request |
2383 | */ | |
a943cac1 ML |
2384 | if (!tt_num_changes) { |
2385 | full_table = false; | |
2386 | goto request_table; | |
2387 | } | |
2388 | ||
96412690 | 2389 | tt_change = (struct batadv_tt_change *)tt_buff; |
a513088d | 2390 | batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes, |
96412690 | 2391 | ttvn, tt_change); |
a943cac1 ML |
2392 | |
2393 | /* Even if we received the precomputed crc with the OGM, we | |
2394 | * prefer to recompute it to spot any possible inconsistency | |
9cfc7bd6 SE |
2395 | * in the global table |
2396 | */ | |
a513088d | 2397 | orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); |
a943cac1 ML |
2398 | |
2399 | /* The ttvn alone is not enough to guarantee consistency | |
2400 | * because a single value could represent different states | |
2401 | * (due to the wrap around). Thus a node has to check whether | |
2402 | * the resulting table (after applying the changes) is still | |
2403 | * consistent or not. E.g. a node could disconnect while its | |
2404 | * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case | |
2405 | * checking the CRC value is mandatory to detect the | |
9cfc7bd6 SE |
2406 | * inconsistency |
2407 | */ | |
a943cac1 ML |
2408 | if (orig_node->tt_crc != tt_crc) |
2409 | goto request_table; | |
2410 | ||
2411 | /* Roaming phase is over: tables are in sync again. I can | |
9cfc7bd6 SE |
2412 | * unset the flag |
2413 | */ | |
a943cac1 ML |
2414 | orig_node->tt_poss_change = false; |
2415 | } else { | |
2416 | /* if we missed more than one change or our tables are not | |
9cfc7bd6 SE |
2417 | * in sync anymore -> request fresh tt data |
2418 | */ | |
17071578 AQ |
2419 | if (!orig_node->tt_initialised || ttvn != orig_ttvn || |
2420 | orig_node->tt_crc != tt_crc) { | |
a943cac1 | 2421 | request_table: |
39c75a51 | 2422 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
2423 | "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n", |
2424 | orig_node->orig, ttvn, orig_ttvn, tt_crc, | |
2425 | orig_node->tt_crc, tt_num_changes); | |
a513088d SE |
2426 | batadv_send_tt_request(bat_priv, orig_node, ttvn, |
2427 | tt_crc, full_table); | |
a943cac1 ML |
2428 | return; |
2429 | } | |
2430 | } | |
2431 | } | |
3275e7cc AQ |
2432 | |
2433 | /* returns true whether we know that the client has moved from its old | |
2434 | * originator to another one. This entry is kept is still kept for consistency | |
2435 | * purposes | |
2436 | */ | |
56303d34 | 2437 | bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv, |
08c36d3e | 2438 | uint8_t *addr) |
3275e7cc | 2439 | { |
56303d34 | 2440 | struct batadv_tt_global_entry *tt_global_entry; |
3275e7cc AQ |
2441 | bool ret = false; |
2442 | ||
a513088d | 2443 | tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); |
3275e7cc AQ |
2444 | if (!tt_global_entry) |
2445 | goto out; | |
2446 | ||
acd34afa | 2447 | ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM; |
a513088d | 2448 | batadv_tt_global_entry_free_ref(tt_global_entry); |
3275e7cc AQ |
2449 | out: |
2450 | return ret; | |
2451 | } | |
30cfd02b AQ |
2452 | |
2453 | bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv, | |
2454 | struct batadv_orig_node *orig_node, | |
2455 | const unsigned char *addr) | |
2456 | { | |
2457 | bool ret = false; | |
2458 | ||
2459 | if (!batadv_tt_global_add(bat_priv, orig_node, addr, | |
2460 | BATADV_TT_CLIENT_TEMP, | |
2461 | atomic_read(&orig_node->last_ttvn))) | |
2462 | goto out; | |
2463 | ||
2464 | batadv_dbg(BATADV_DBG_TT, bat_priv, | |
2465 | "Added temporary global client (addr: %pM orig: %pM)\n", | |
2466 | addr, orig_node->orig); | |
2467 | ret = true; | |
2468 | out: | |
2469 | return ret; | |
2470 | } |