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TOMOYO Linux Cross Reference
Linux/net/batman-adv/translation-table.c

Version: ~ [ linux-5.12-rc1 ] ~ [ linux-5.11.2 ] ~ [ linux-5.10.19 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.101 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.177 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.222 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.258 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.258 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /* Copyright (C) 2007-2016  B.A.T.M.A.N. contributors:
  2  *
  3  * Marek Lindner, Simon Wunderlich, Antonio Quartulli
  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, see <http://www.gnu.org/licenses/>.
 16  */
 17 
 18 #include "translation-table.h"
 19 #include "main.h"
 20 
 21 #include <linux/atomic.h>
 22 #include <linux/bitops.h>
 23 #include <linux/bug.h>
 24 #include <linux/byteorder/generic.h>
 25 #include <linux/compiler.h>
 26 #include <linux/crc32c.h>
 27 #include <linux/errno.h>
 28 #include <linux/etherdevice.h>
 29 #include <linux/fs.h>
 30 #include <linux/if_ether.h>
 31 #include <linux/jhash.h>
 32 #include <linux/jiffies.h>
 33 #include <linux/kernel.h>
 34 #include <linux/kref.h>
 35 #include <linux/list.h>
 36 #include <linux/lockdep.h>
 37 #include <linux/netdevice.h>
 38 #include <linux/rculist.h>
 39 #include <linux/rcupdate.h>
 40 #include <linux/seq_file.h>
 41 #include <linux/slab.h>
 42 #include <linux/spinlock.h>
 43 #include <linux/stddef.h>
 44 #include <linux/string.h>
 45 #include <linux/workqueue.h>
 46 
 47 #include "bridge_loop_avoidance.h"
 48 #include "hard-interface.h"
 49 #include "hash.h"
 50 #include "log.h"
 51 #include "multicast.h"
 52 #include "originator.h"
 53 #include "packet.h"
 54 #include "soft-interface.h"
 55 #include "tvlv.h"
 56 
 57 /* hash class keys */
 58 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
 59 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
 60 
 61 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
 62                                  unsigned short vid,
 63                                  struct batadv_orig_node *orig_node);
 64 static void batadv_tt_purge(struct work_struct *work);
 65 static void
 66 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
 67 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
 68                                  struct batadv_orig_node *orig_node,
 69                                  const unsigned char *addr,
 70                                  unsigned short vid, const char *message,
 71                                  bool roaming);
 72 
 73 /**
 74  * batadv_compare_tt - check if two TT entries are the same
 75  * @node: the list element pointer of the first TT entry
 76  * @data2: pointer to the tt_common_entry of the second TT entry
 77  *
 78  * Compare the MAC address and the VLAN ID of the two TT entries and check if
 79  * they are the same TT client.
 80  * Return: true if the two TT clients are the same, false otherwise
 81  */
 82 static bool batadv_compare_tt(const struct hlist_node *node, const void *data2)
 83 {
 84         const void *data1 = container_of(node, struct batadv_tt_common_entry,
 85                                          hash_entry);
 86         const struct batadv_tt_common_entry *tt1 = data1;
 87         const struct batadv_tt_common_entry *tt2 = data2;
 88 
 89         return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2);
 90 }
 91 
 92 /**
 93  * batadv_choose_tt - return the index of the tt entry in the hash table
 94  * @data: pointer to the tt_common_entry object to map
 95  * @size: the size of the hash table
 96  *
 97  * Return: the hash index where the object represented by 'data' should be
 98  * stored at.
 99  */
100 static inline u32 batadv_choose_tt(const void *data, u32 size)
101 {
102         struct batadv_tt_common_entry *tt;
103         u32 hash = 0;
104 
105         tt = (struct batadv_tt_common_entry *)data;
106         hash = jhash(&tt->addr, ETH_ALEN, hash);
107         hash = jhash(&tt->vid, sizeof(tt->vid), hash);
108 
109         return hash % size;
110 }
111 
112 /**
113  * batadv_tt_hash_find - look for a client in the given hash table
114  * @hash: the hash table to search
115  * @addr: the mac address of the client to look for
116  * @vid: VLAN identifier
117  *
118  * Return: a pointer to the tt_common struct belonging to the searched client if
119  * found, NULL otherwise.
120  */
121 static struct batadv_tt_common_entry *
122 batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
123                     unsigned short vid)
124 {
125         struct hlist_head *head;
126         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
127         u32 index;
128 
129         if (!hash)
130                 return NULL;
131 
132         ether_addr_copy(to_search.addr, addr);
133         to_search.vid = vid;
134 
135         index = batadv_choose_tt(&to_search, hash->size);
136         head = &hash->table[index];
137 
138         rcu_read_lock();
139         hlist_for_each_entry_rcu(tt, head, hash_entry) {
140                 if (!batadv_compare_eth(tt, addr))
141                         continue;
142 
143                 if (tt->vid != vid)
144                         continue;
145 
146                 if (!kref_get_unless_zero(&tt->refcount))
147                         continue;
148 
149                 tt_tmp = tt;
150                 break;
151         }
152         rcu_read_unlock();
153 
154         return tt_tmp;
155 }
156 
157 /**
158  * batadv_tt_local_hash_find - search the local table for a given client
159  * @bat_priv: the bat priv with all the soft interface information
160  * @addr: the mac address of the client to look for
161  * @vid: VLAN identifier
162  *
163  * Return: a pointer to the corresponding tt_local_entry struct if the client is
164  * found, NULL otherwise.
165  */
166 static struct batadv_tt_local_entry *
167 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
168                           unsigned short vid)
169 {
170         struct batadv_tt_common_entry *tt_common_entry;
171         struct batadv_tt_local_entry *tt_local_entry = NULL;
172 
173         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
174                                               vid);
175         if (tt_common_entry)
176                 tt_local_entry = container_of(tt_common_entry,
177                                               struct batadv_tt_local_entry,
178                                               common);
179         return tt_local_entry;
180 }
181 
182 /**
183  * batadv_tt_global_hash_find - search the global table for a given client
184  * @bat_priv: the bat priv with all the soft interface information
185  * @addr: the mac address of the client to look for
186  * @vid: VLAN identifier
187  *
188  * Return: a pointer to the corresponding tt_global_entry struct if the client
189  * is found, NULL otherwise.
190  */
191 static struct batadv_tt_global_entry *
192 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
193                            unsigned short vid)
194 {
195         struct batadv_tt_common_entry *tt_common_entry;
196         struct batadv_tt_global_entry *tt_global_entry = NULL;
197 
198         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
199                                               vid);
200         if (tt_common_entry)
201                 tt_global_entry = container_of(tt_common_entry,
202                                                struct batadv_tt_global_entry,
203                                                common);
204         return tt_global_entry;
205 }
206 
207 /**
208  * batadv_tt_local_entry_release - release tt_local_entry from lists and queue
209  *  for free after rcu grace period
210  * @ref: kref pointer of the nc_node
211  */
212 static void batadv_tt_local_entry_release(struct kref *ref)
213 {
214         struct batadv_tt_local_entry *tt_local_entry;
215 
216         tt_local_entry = container_of(ref, struct batadv_tt_local_entry,
217                                       common.refcount);
218 
219         batadv_softif_vlan_put(tt_local_entry->vlan);
220 
221         kfree_rcu(tt_local_entry, common.rcu);
222 }
223 
224 /**
225  * batadv_tt_local_entry_put - decrement the tt_local_entry refcounter and
226  *  possibly release it
227  * @tt_local_entry: tt_local_entry to be free'd
228  */
229 static void
230 batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry)
231 {
232         kref_put(&tt_local_entry->common.refcount,
233                  batadv_tt_local_entry_release);
234 }
235 
236 /**
237  * batadv_tt_global_entry_release - release tt_global_entry from lists and queue
238  *  for free after rcu grace period
239  * @ref: kref pointer of the nc_node
240  */
241 static void batadv_tt_global_entry_release(struct kref *ref)
242 {
243         struct batadv_tt_global_entry *tt_global_entry;
244 
245         tt_global_entry = container_of(ref, struct batadv_tt_global_entry,
246                                        common.refcount);
247 
248         batadv_tt_global_del_orig_list(tt_global_entry);
249         kfree_rcu(tt_global_entry, common.rcu);
250 }
251 
252 /**
253  * batadv_tt_global_entry_put - decrement the tt_global_entry refcounter and
254  *  possibly release it
255  * @tt_global_entry: tt_global_entry to be free'd
256  */
257 static void
258 batadv_tt_global_entry_put(struct batadv_tt_global_entry *tt_global_entry)
259 {
260         kref_put(&tt_global_entry->common.refcount,
261                  batadv_tt_global_entry_release);
262 }
263 
264 /**
265  * batadv_tt_global_hash_count - count the number of orig entries
266  * @bat_priv: the bat priv with all the soft interface information
267  * @addr: the mac address of the client to count entries for
268  * @vid: VLAN identifier
269  *
270  * Return: the number of originators advertising the given address/data
271  * (excluding ourself).
272  */
273 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
274                                 const u8 *addr, unsigned short vid)
275 {
276         struct batadv_tt_global_entry *tt_global_entry;
277         int count;
278 
279         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
280         if (!tt_global_entry)
281                 return 0;
282 
283         count = atomic_read(&tt_global_entry->orig_list_count);
284         batadv_tt_global_entry_put(tt_global_entry);
285 
286         return count;
287 }
288 
289 /**
290  * batadv_tt_local_size_mod - change the size by v of the local table identified
291  *  by vid
292  * @bat_priv: the bat priv with all the soft interface information
293  * @vid: the VLAN identifier of the sub-table to change
294  * @v: the amount to sum to the local table size
295  */
296 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
297                                      unsigned short vid, int v)
298 {
299         struct batadv_softif_vlan *vlan;
300 
301         vlan = batadv_softif_vlan_get(bat_priv, vid);
302         if (!vlan)
303                 return;
304 
305         atomic_add(v, &vlan->tt.num_entries);
306 
307         batadv_softif_vlan_put(vlan);
308 }
309 
310 /**
311  * batadv_tt_local_size_inc - increase by one the local table size for the given
312  *  vid
313  * @bat_priv: the bat priv with all the soft interface information
314  * @vid: the VLAN identifier
315  */
316 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
317                                      unsigned short vid)
318 {
319         batadv_tt_local_size_mod(bat_priv, vid, 1);
320 }
321 
322 /**
323  * batadv_tt_local_size_dec - decrease by one the local table size for the given
324  *  vid
325  * @bat_priv: the bat priv with all the soft interface information
326  * @vid: the VLAN identifier
327  */
328 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
329                                      unsigned short vid)
330 {
331         batadv_tt_local_size_mod(bat_priv, vid, -1);
332 }
333 
334 /**
335  * batadv_tt_global_size_mod - change the size by v of the global table
336  *  for orig_node identified by vid
337  * @orig_node: the originator for which the table has to be modified
338  * @vid: the VLAN identifier
339  * @v: the amount to sum to the global table size
340  */
341 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
342                                       unsigned short vid, int v)
343 {
344         struct batadv_orig_node_vlan *vlan;
345 
346         vlan = batadv_orig_node_vlan_new(orig_node, vid);
347         if (!vlan)
348                 return;
349 
350         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
351                 spin_lock_bh(&orig_node->vlan_list_lock);
352                 if (!hlist_unhashed(&vlan->list)) {
353                         hlist_del_init_rcu(&vlan->list);
354                         batadv_orig_node_vlan_put(vlan);
355                 }
356                 spin_unlock_bh(&orig_node->vlan_list_lock);
357         }
358 
359         batadv_orig_node_vlan_put(vlan);
360 }
361 
362 /**
363  * batadv_tt_global_size_inc - increase by one the global table size for the
364  *  given vid
365  * @orig_node: the originator which global table size has to be decreased
366  * @vid: the vlan identifier
367  */
368 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
369                                       unsigned short vid)
370 {
371         batadv_tt_global_size_mod(orig_node, vid, 1);
372 }
373 
374 /**
375  * batadv_tt_global_size_dec - decrease by one the global table size for the
376  *  given vid
377  * @orig_node: the originator which global table size has to be decreased
378  * @vid: the vlan identifier
379  */
380 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
381                                       unsigned short vid)
382 {
383         batadv_tt_global_size_mod(orig_node, vid, -1);
384 }
385 
386 /**
387  * batadv_tt_orig_list_entry_release - release tt orig entry from lists and
388  *  queue for free after rcu grace period
389  * @ref: kref pointer of the tt orig entry
390  */
391 static void batadv_tt_orig_list_entry_release(struct kref *ref)
392 {
393         struct batadv_tt_orig_list_entry *orig_entry;
394 
395         orig_entry = container_of(ref, struct batadv_tt_orig_list_entry,
396                                   refcount);
397 
398         batadv_orig_node_put(orig_entry->orig_node);
399         kfree_rcu(orig_entry, rcu);
400 }
401 
402 /**
403  * batadv_tt_orig_list_entry_put - decrement the tt orig entry refcounter and
404  *  possibly release it
405  * @orig_entry: tt orig entry to be free'd
406  */
407 static void
408 batadv_tt_orig_list_entry_put(struct batadv_tt_orig_list_entry *orig_entry)
409 {
410         kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release);
411 }
412 
413 /**
414  * batadv_tt_local_event - store a local TT event (ADD/DEL)
415  * @bat_priv: the bat priv with all the soft interface information
416  * @tt_local_entry: the TT entry involved in the event
417  * @event_flags: flags to store in the event structure
418  */
419 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
420                                   struct batadv_tt_local_entry *tt_local_entry,
421                                   u8 event_flags)
422 {
423         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
424         struct batadv_tt_common_entry *common = &tt_local_entry->common;
425         u8 flags = common->flags | event_flags;
426         bool event_removed = false;
427         bool del_op_requested, del_op_entry;
428 
429         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
430         if (!tt_change_node)
431                 return;
432 
433         tt_change_node->change.flags = flags;
434         memset(tt_change_node->change.reserved, 0,
435                sizeof(tt_change_node->change.reserved));
436         ether_addr_copy(tt_change_node->change.addr, common->addr);
437         tt_change_node->change.vid = htons(common->vid);
438 
439         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
440 
441         /* check for ADD+DEL or DEL+ADD events */
442         spin_lock_bh(&bat_priv->tt.changes_list_lock);
443         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
444                                  list) {
445                 if (!batadv_compare_eth(entry->change.addr, common->addr))
446                         continue;
447 
448                 /* DEL+ADD in the same orig interval have no effect and can be
449                  * removed to avoid silly behaviour on the receiver side. The
450                  * other way around (ADD+DEL) can happen in case of roaming of
451                  * a client still in the NEW state. Roaming of NEW clients is
452                  * now possible due to automatically recognition of "temporary"
453                  * clients
454                  */
455                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
456                 if (!del_op_requested && del_op_entry)
457                         goto del;
458                 if (del_op_requested && !del_op_entry)
459                         goto del;
460 
461                 /* this is a second add in the same originator interval. It
462                  * means that flags have been changed: update them!
463                  */
464                 if (!del_op_requested && !del_op_entry)
465                         entry->change.flags = flags;
466 
467                 continue;
468 del:
469                 list_del(&entry->list);
470                 kfree(entry);
471                 kfree(tt_change_node);
472                 event_removed = true;
473                 goto unlock;
474         }
475 
476         /* track the change in the OGMinterval list */
477         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
478 
479 unlock:
480         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
481 
482         if (event_removed)
483                 atomic_dec(&bat_priv->tt.local_changes);
484         else
485                 atomic_inc(&bat_priv->tt.local_changes);
486 }
487 
488 /**
489  * batadv_tt_len - compute length in bytes of given number of tt changes
490  * @changes_num: number of tt changes
491  *
492  * Return: computed length in bytes.
493  */
494 static int batadv_tt_len(int changes_num)
495 {
496         return changes_num * sizeof(struct batadv_tvlv_tt_change);
497 }
498 
499 /**
500  * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
501  * @tt_len: available space
502  *
503  * Return: the number of entries.
504  */
505 static u16 batadv_tt_entries(u16 tt_len)
506 {
507         return tt_len / batadv_tt_len(1);
508 }
509 
510 /**
511  * batadv_tt_local_table_transmit_size - calculates the local translation table
512  *  size when transmitted over the air
513  * @bat_priv: the bat priv with all the soft interface information
514  *
515  * Return: local translation table size in bytes.
516  */
517 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
518 {
519         u16 num_vlan = 0;
520         u16 tt_local_entries = 0;
521         struct batadv_softif_vlan *vlan;
522         int hdr_size;
523 
524         rcu_read_lock();
525         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
526                 num_vlan++;
527                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
528         }
529         rcu_read_unlock();
530 
531         /* header size of tvlv encapsulated tt response payload */
532         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
533         hdr_size += sizeof(struct batadv_tvlv_hdr);
534         hdr_size += sizeof(struct batadv_tvlv_tt_data);
535         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
536 
537         return hdr_size + batadv_tt_len(tt_local_entries);
538 }
539 
540 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
541 {
542         if (bat_priv->tt.local_hash)
543                 return 0;
544 
545         bat_priv->tt.local_hash = batadv_hash_new(1024);
546 
547         if (!bat_priv->tt.local_hash)
548                 return -ENOMEM;
549 
550         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
551                                    &batadv_tt_local_hash_lock_class_key);
552 
553         return 0;
554 }
555 
556 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
557                                   struct batadv_tt_global_entry *tt_global,
558                                   const char *message)
559 {
560         batadv_dbg(BATADV_DBG_TT, bat_priv,
561                    "Deleting global tt entry %pM (vid: %d): %s\n",
562                    tt_global->common.addr,
563                    BATADV_PRINT_VID(tt_global->common.vid), message);
564 
565         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
566                            batadv_choose_tt, &tt_global->common);
567         batadv_tt_global_entry_put(tt_global);
568 }
569 
570 /**
571  * batadv_tt_local_add - add a new client to the local table or update an
572  *  existing client
573  * @soft_iface: netdev struct of the mesh interface
574  * @addr: the mac address of the client to add
575  * @vid: VLAN identifier
576  * @ifindex: index of the interface where the client is connected to (useful to
577  *  identify wireless clients)
578  * @mark: the value contained in the skb->mark field of the received packet (if
579  *  any)
580  *
581  * Return: true if the client was successfully added, false otherwise.
582  */
583 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
584                          unsigned short vid, int ifindex, u32 mark)
585 {
586         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
587         struct batadv_tt_local_entry *tt_local;
588         struct batadv_tt_global_entry *tt_global = NULL;
589         struct net *net = dev_net(soft_iface);
590         struct batadv_softif_vlan *vlan;
591         struct net_device *in_dev = NULL;
592         struct hlist_head *head;
593         struct batadv_tt_orig_list_entry *orig_entry;
594         int hash_added, table_size, packet_size_max;
595         bool ret = false;
596         bool roamed_back = false;
597         u8 remote_flags;
598         u32 match_mark;
599 
600         if (ifindex != BATADV_NULL_IFINDEX)
601                 in_dev = dev_get_by_index(net, ifindex);
602 
603         tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
604 
605         if (!is_multicast_ether_addr(addr))
606                 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
607 
608         if (tt_local) {
609                 tt_local->last_seen = jiffies;
610                 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
611                         batadv_dbg(BATADV_DBG_TT, bat_priv,
612                                    "Re-adding pending client %pM (vid: %d)\n",
613                                    addr, BATADV_PRINT_VID(vid));
614                         /* whatever the reason why the PENDING flag was set,
615                          * this is a client which was enqueued to be removed in
616                          * this orig_interval. Since it popped up again, the
617                          * flag can be reset like it was never enqueued
618                          */
619                         tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
620                         goto add_event;
621                 }
622 
623                 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
624                         batadv_dbg(BATADV_DBG_TT, bat_priv,
625                                    "Roaming client %pM (vid: %d) came back to its original location\n",
626                                    addr, BATADV_PRINT_VID(vid));
627                         /* the ROAM flag is set because this client roamed away
628                          * and the node got a roaming_advertisement message. Now
629                          * that the client popped up again at its original
630                          * location such flag can be unset
631                          */
632                         tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
633                         roamed_back = true;
634                 }
635                 goto check_roaming;
636         }
637 
638         /* Ignore the client if we cannot send it in a full table response. */
639         table_size = batadv_tt_local_table_transmit_size(bat_priv);
640         table_size += batadv_tt_len(1);
641         packet_size_max = atomic_read(&bat_priv->packet_size_max);
642         if (table_size > packet_size_max) {
643                 net_ratelimited_function(batadv_info, soft_iface,
644                                          "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
645                                          table_size, packet_size_max, addr);
646                 goto out;
647         }
648 
649         tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
650         if (!tt_local)
651                 goto out;
652 
653         /* increase the refcounter of the related vlan */
654         vlan = batadv_softif_vlan_get(bat_priv, vid);
655         if (!vlan) {
656                 net_ratelimited_function(batadv_info, soft_iface,
657                                          "adding TT local entry %pM to non-existent VLAN %d\n",
658                                          addr, BATADV_PRINT_VID(vid));
659                 kfree(tt_local);
660                 tt_local = NULL;
661                 goto out;
662         }
663 
664         batadv_dbg(BATADV_DBG_TT, bat_priv,
665                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
666                    addr, BATADV_PRINT_VID(vid),
667                    (u8)atomic_read(&bat_priv->tt.vn));
668 
669         ether_addr_copy(tt_local->common.addr, addr);
670         /* The local entry has to be marked as NEW to avoid to send it in
671          * a full table response going out before the next ttvn increment
672          * (consistency check)
673          */
674         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
675         tt_local->common.vid = vid;
676         if (batadv_is_wifi_netdev(in_dev))
677                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
678         kref_init(&tt_local->common.refcount);
679         kref_get(&tt_local->common.refcount);
680         tt_local->last_seen = jiffies;
681         tt_local->common.added_at = tt_local->last_seen;
682         tt_local->vlan = vlan;
683 
684         /* the batman interface mac and multicast addresses should never be
685          * purged
686          */
687         if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
688             is_multicast_ether_addr(addr))
689                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
690 
691         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
692                                      batadv_choose_tt, &tt_local->common,
693                                      &tt_local->common.hash_entry);
694 
695         if (unlikely(hash_added != 0)) {
696                 /* remove the reference for the hash */
697                 batadv_tt_local_entry_put(tt_local);
698                 goto out;
699         }
700 
701 add_event:
702         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
703 
704 check_roaming:
705         /* Check whether it is a roaming, but don't do anything if the roaming
706          * process has already been handled
707          */
708         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
709                 /* These node are probably going to update their tt table */
710                 head = &tt_global->orig_list;
711                 rcu_read_lock();
712                 hlist_for_each_entry_rcu(orig_entry, head, list) {
713                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
714                                              tt_global->common.vid,
715                                              orig_entry->orig_node);
716                 }
717                 rcu_read_unlock();
718                 if (roamed_back) {
719                         batadv_tt_global_free(bat_priv, tt_global,
720                                               "Roaming canceled");
721                         tt_global = NULL;
722                 } else {
723                         /* The global entry has to be marked as ROAMING and
724                          * has to be kept for consistency purpose
725                          */
726                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
727                         tt_global->roam_at = jiffies;
728                 }
729         }
730 
731         /* store the current remote flags before altering them. This helps
732          * understanding is flags are changing or not
733          */
734         remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
735 
736         if (batadv_is_wifi_netdev(in_dev))
737                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
738         else
739                 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
740 
741         /* check the mark in the skb: if it's equal to the configured
742          * isolation_mark, it means the packet is coming from an isolated
743          * non-mesh client
744          */
745         match_mark = (mark & bat_priv->isolation_mark_mask);
746         if (bat_priv->isolation_mark_mask &&
747             match_mark == bat_priv->isolation_mark)
748                 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
749         else
750                 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
751 
752         /* if any "dynamic" flag has been modified, resend an ADD event for this
753          * entry so that all the nodes can get the new flags
754          */
755         if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
756                 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
757 
758         ret = true;
759 out:
760         if (in_dev)
761                 dev_put(in_dev);
762         if (tt_local)
763                 batadv_tt_local_entry_put(tt_local);
764         if (tt_global)
765                 batadv_tt_global_entry_put(tt_global);
766         return ret;
767 }
768 
769 /**
770  * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
771  *  within a TT Response directed to another node
772  * @orig_node: originator for which the TT data has to be prepared
773  * @tt_data: uninitialised pointer to the address of the TVLV buffer
774  * @tt_change: uninitialised pointer to the address of the area where the TT
775  *  changed can be stored
776  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
777  *  function reserves the amount of space needed to send the entire global TT
778  *  table. In case of success the value is updated with the real amount of
779  *  reserved bytes
780  * Allocate the needed amount of memory for the entire TT TVLV and write its
781  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
782  * objects, one per active VLAN served by the originator node.
783  *
784  * Return: the size of the allocated buffer or 0 in case of failure.
785  */
786 static u16
787 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
788                                    struct batadv_tvlv_tt_data **tt_data,
789                                    struct batadv_tvlv_tt_change **tt_change,
790                                    s32 *tt_len)
791 {
792         u16 num_vlan = 0;
793         u16 num_entries = 0;
794         u16 change_offset;
795         u16 tvlv_len;
796         struct batadv_tvlv_tt_vlan_data *tt_vlan;
797         struct batadv_orig_node_vlan *vlan;
798         u8 *tt_change_ptr;
799 
800         rcu_read_lock();
801         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
802                 num_vlan++;
803                 num_entries += atomic_read(&vlan->tt.num_entries);
804         }
805 
806         change_offset = sizeof(**tt_data);
807         change_offset += num_vlan * sizeof(*tt_vlan);
808 
809         /* if tt_len is negative, allocate the space needed by the full table */
810         if (*tt_len < 0)
811                 *tt_len = batadv_tt_len(num_entries);
812 
813         tvlv_len = *tt_len;
814         tvlv_len += change_offset;
815 
816         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
817         if (!*tt_data) {
818                 *tt_len = 0;
819                 goto out;
820         }
821 
822         (*tt_data)->flags = BATADV_NO_FLAGS;
823         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
824         (*tt_data)->num_vlan = htons(num_vlan);
825 
826         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
827         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
828                 tt_vlan->vid = htons(vlan->vid);
829                 tt_vlan->crc = htonl(vlan->tt.crc);
830 
831                 tt_vlan++;
832         }
833 
834         tt_change_ptr = (u8 *)*tt_data + change_offset;
835         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
836 
837 out:
838         rcu_read_unlock();
839         return tvlv_len;
840 }
841 
842 /**
843  * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
844  *  node
845  * @bat_priv: the bat priv with all the soft interface information
846  * @tt_data: uninitialised pointer to the address of the TVLV buffer
847  * @tt_change: uninitialised pointer to the address of the area where the TT
848  *  changes can be stored
849  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
850  *  function reserves the amount of space needed to send the entire local TT
851  *  table. In case of success the value is updated with the real amount of
852  *  reserved bytes
853  *
854  * Allocate the needed amount of memory for the entire TT TVLV and write its
855  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
856  * objects, one per active VLAN.
857  *
858  * Return: the size of the allocated buffer or 0 in case of failure.
859  */
860 static u16
861 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
862                                   struct batadv_tvlv_tt_data **tt_data,
863                                   struct batadv_tvlv_tt_change **tt_change,
864                                   s32 *tt_len)
865 {
866         struct batadv_tvlv_tt_vlan_data *tt_vlan;
867         struct batadv_softif_vlan *vlan;
868         u16 num_vlan = 0;
869         u16 num_entries = 0;
870         u16 tvlv_len;
871         u8 *tt_change_ptr;
872         int change_offset;
873 
874         rcu_read_lock();
875         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
876                 num_vlan++;
877                 num_entries += atomic_read(&vlan->tt.num_entries);
878         }
879 
880         change_offset = sizeof(**tt_data);
881         change_offset += num_vlan * sizeof(*tt_vlan);
882 
883         /* if tt_len is negative, allocate the space needed by the full table */
884         if (*tt_len < 0)
885                 *tt_len = batadv_tt_len(num_entries);
886 
887         tvlv_len = *tt_len;
888         tvlv_len += change_offset;
889 
890         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
891         if (!*tt_data) {
892                 tvlv_len = 0;
893                 goto out;
894         }
895 
896         (*tt_data)->flags = BATADV_NO_FLAGS;
897         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
898         (*tt_data)->num_vlan = htons(num_vlan);
899 
900         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
901         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
902                 tt_vlan->vid = htons(vlan->vid);
903                 tt_vlan->crc = htonl(vlan->tt.crc);
904 
905                 tt_vlan++;
906         }
907 
908         tt_change_ptr = (u8 *)*tt_data + change_offset;
909         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
910 
911 out:
912         rcu_read_unlock();
913         return tvlv_len;
914 }
915 
916 /**
917  * batadv_tt_tvlv_container_update - update the translation table tvlv container
918  *  after local tt changes have been committed
919  * @bat_priv: the bat priv with all the soft interface information
920  */
921 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
922 {
923         struct batadv_tt_change_node *entry, *safe;
924         struct batadv_tvlv_tt_data *tt_data;
925         struct batadv_tvlv_tt_change *tt_change;
926         int tt_diff_len, tt_change_len = 0;
927         int tt_diff_entries_num = 0;
928         int tt_diff_entries_count = 0;
929         u16 tvlv_len;
930 
931         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
932         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
933 
934         /* if we have too many changes for one packet don't send any
935          * and wait for the tt table request which will be fragmented
936          */
937         if (tt_diff_len > bat_priv->soft_iface->mtu)
938                 tt_diff_len = 0;
939 
940         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
941                                                      &tt_change, &tt_diff_len);
942         if (!tvlv_len)
943                 return;
944 
945         tt_data->flags = BATADV_TT_OGM_DIFF;
946 
947         if (tt_diff_len == 0)
948                 goto container_register;
949 
950         spin_lock_bh(&bat_priv->tt.changes_list_lock);
951         atomic_set(&bat_priv->tt.local_changes, 0);
952 
953         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
954                                  list) {
955                 if (tt_diff_entries_count < tt_diff_entries_num) {
956                         memcpy(tt_change + tt_diff_entries_count,
957                                &entry->change,
958                                sizeof(struct batadv_tvlv_tt_change));
959                         tt_diff_entries_count++;
960                 }
961                 list_del(&entry->list);
962                 kfree(entry);
963         }
964         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
965 
966         /* Keep the buffer for possible tt_request */
967         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
968         kfree(bat_priv->tt.last_changeset);
969         bat_priv->tt.last_changeset_len = 0;
970         bat_priv->tt.last_changeset = NULL;
971         tt_change_len = batadv_tt_len(tt_diff_entries_count);
972         /* check whether this new OGM has no changes due to size problems */
973         if (tt_diff_entries_count > 0) {
974                 /* if kmalloc() fails we will reply with the full table
975                  * instead of providing the diff
976                  */
977                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
978                 if (bat_priv->tt.last_changeset) {
979                         memcpy(bat_priv->tt.last_changeset,
980                                tt_change, tt_change_len);
981                         bat_priv->tt.last_changeset_len = tt_diff_len;
982                 }
983         }
984         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
985 
986 container_register:
987         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
988                                        tvlv_len);
989         kfree(tt_data);
990 }
991 
992 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
993 {
994         struct net_device *net_dev = (struct net_device *)seq->private;
995         struct batadv_priv *bat_priv = netdev_priv(net_dev);
996         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
997         struct batadv_tt_common_entry *tt_common_entry;
998         struct batadv_tt_local_entry *tt_local;
999         struct batadv_hard_iface *primary_if;
1000         struct hlist_head *head;
1001         u32 i;
1002         int last_seen_secs;
1003         int last_seen_msecs;
1004         unsigned long last_seen_jiffies;
1005         bool no_purge;
1006         u16 np_flag = BATADV_TT_CLIENT_NOPURGE;
1007 
1008         primary_if = batadv_seq_print_text_primary_if_get(seq);
1009         if (!primary_if)
1010                 goto out;
1011 
1012         seq_printf(seq,
1013                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
1014                    net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
1015         seq_puts(seq,
1016                  "       Client         VID Flags    Last seen (CRC       )\n");
1017 
1018         for (i = 0; i < hash->size; i++) {
1019                 head = &hash->table[i];
1020 
1021                 rcu_read_lock();
1022                 hlist_for_each_entry_rcu(tt_common_entry,
1023                                          head, hash_entry) {
1024                         tt_local = container_of(tt_common_entry,
1025                                                 struct batadv_tt_local_entry,
1026                                                 common);
1027                         last_seen_jiffies = jiffies - tt_local->last_seen;
1028                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1029                         last_seen_secs = last_seen_msecs / 1000;
1030                         last_seen_msecs = last_seen_msecs % 1000;
1031 
1032                         no_purge = tt_common_entry->flags & np_flag;
1033                         seq_printf(seq,
1034                                    " * %pM %4i [%c%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
1035                                    tt_common_entry->addr,
1036                                    BATADV_PRINT_VID(tt_common_entry->vid),
1037                                    ((tt_common_entry->flags &
1038                                      BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1039                                    no_purge ? 'P' : '.',
1040                                    ((tt_common_entry->flags &
1041                                      BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
1042                                    ((tt_common_entry->flags &
1043                                      BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
1044                                    ((tt_common_entry->flags &
1045                                      BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1046                                    ((tt_common_entry->flags &
1047                                      BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1048                                    no_purge ? 0 : last_seen_secs,
1049                                    no_purge ? 0 : last_seen_msecs,
1050                                    tt_local->vlan->tt.crc);
1051                 }
1052                 rcu_read_unlock();
1053         }
1054 out:
1055         if (primary_if)
1056                 batadv_hardif_put(primary_if);
1057         return 0;
1058 }
1059 
1060 static void
1061 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1062                             struct batadv_tt_local_entry *tt_local_entry,
1063                             u16 flags, const char *message)
1064 {
1065         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1066 
1067         /* The local client has to be marked as "pending to be removed" but has
1068          * to be kept in the table in order to send it in a full table
1069          * response issued before the net ttvn increment (consistency check)
1070          */
1071         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1072 
1073         batadv_dbg(BATADV_DBG_TT, bat_priv,
1074                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1075                    tt_local_entry->common.addr,
1076                    BATADV_PRINT_VID(tt_local_entry->common.vid), message);
1077 }
1078 
1079 /**
1080  * batadv_tt_local_remove - logically remove an entry from the local table
1081  * @bat_priv: the bat priv with all the soft interface information
1082  * @addr: the MAC address of the client to remove
1083  * @vid: VLAN identifier
1084  * @message: message to append to the log on deletion
1085  * @roaming: true if the deletion is due to a roaming event
1086  *
1087  * Return: the flags assigned to the local entry before being deleted
1088  */
1089 u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
1090                            unsigned short vid, const char *message,
1091                            bool roaming)
1092 {
1093         struct batadv_tt_local_entry *tt_local_entry;
1094         u16 flags, curr_flags = BATADV_NO_FLAGS;
1095         void *tt_entry_exists;
1096 
1097         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1098         if (!tt_local_entry)
1099                 goto out;
1100 
1101         curr_flags = tt_local_entry->common.flags;
1102 
1103         flags = BATADV_TT_CLIENT_DEL;
1104         /* if this global entry addition is due to a roaming, the node has to
1105          * mark the local entry as "roamed" in order to correctly reroute
1106          * packets later
1107          */
1108         if (roaming) {
1109                 flags |= BATADV_TT_CLIENT_ROAM;
1110                 /* mark the local client as ROAMed */
1111                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1112         }
1113 
1114         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1115                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1116                                             message);
1117                 goto out;
1118         }
1119         /* if this client has been added right now, it is possible to
1120          * immediately purge it
1121          */
1122         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1123 
1124         tt_entry_exists = batadv_hash_remove(bat_priv->tt.local_hash,
1125                                              batadv_compare_tt,
1126                                              batadv_choose_tt,
1127                                              &tt_local_entry->common);
1128         if (!tt_entry_exists)
1129                 goto out;
1130 
1131         /* extra call to free the local tt entry */
1132         batadv_tt_local_entry_put(tt_local_entry);
1133 
1134 out:
1135         if (tt_local_entry)
1136                 batadv_tt_local_entry_put(tt_local_entry);
1137 
1138         return curr_flags;
1139 }
1140 
1141 /**
1142  * batadv_tt_local_purge_list - purge inactive tt local entries
1143  * @bat_priv: the bat priv with all the soft interface information
1144  * @head: pointer to the list containing the local tt entries
1145  * @timeout: parameter deciding whether a given tt local entry is considered
1146  *  inactive or not
1147  */
1148 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1149                                        struct hlist_head *head,
1150                                        int timeout)
1151 {
1152         struct batadv_tt_local_entry *tt_local_entry;
1153         struct batadv_tt_common_entry *tt_common_entry;
1154         struct hlist_node *node_tmp;
1155 
1156         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1157                                   hash_entry) {
1158                 tt_local_entry = container_of(tt_common_entry,
1159                                               struct batadv_tt_local_entry,
1160                                               common);
1161                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1162                         continue;
1163 
1164                 /* entry already marked for deletion */
1165                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1166                         continue;
1167 
1168                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1169                         continue;
1170 
1171                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1172                                             BATADV_TT_CLIENT_DEL, "timed out");
1173         }
1174 }
1175 
1176 /**
1177  * batadv_tt_local_purge - purge inactive tt local entries
1178  * @bat_priv: the bat priv with all the soft interface information
1179  * @timeout: parameter deciding whether a given tt local entry is considered
1180  *  inactive or not
1181  */
1182 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1183                                   int timeout)
1184 {
1185         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1186         struct hlist_head *head;
1187         spinlock_t *list_lock; /* protects write access to the hash lists */
1188         u32 i;
1189 
1190         for (i = 0; i < hash->size; i++) {
1191                 head = &hash->table[i];
1192                 list_lock = &hash->list_locks[i];
1193 
1194                 spin_lock_bh(list_lock);
1195                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1196                 spin_unlock_bh(list_lock);
1197         }
1198 }
1199 
1200 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1201 {
1202         struct batadv_hashtable *hash;
1203         spinlock_t *list_lock; /* protects write access to the hash lists */
1204         struct batadv_tt_common_entry *tt_common_entry;
1205         struct batadv_tt_local_entry *tt_local;
1206         struct hlist_node *node_tmp;
1207         struct hlist_head *head;
1208         u32 i;
1209 
1210         if (!bat_priv->tt.local_hash)
1211                 return;
1212 
1213         hash = bat_priv->tt.local_hash;
1214 
1215         for (i = 0; i < hash->size; i++) {
1216                 head = &hash->table[i];
1217                 list_lock = &hash->list_locks[i];
1218 
1219                 spin_lock_bh(list_lock);
1220                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1221                                           head, hash_entry) {
1222                         hlist_del_rcu(&tt_common_entry->hash_entry);
1223                         tt_local = container_of(tt_common_entry,
1224                                                 struct batadv_tt_local_entry,
1225                                                 common);
1226 
1227                         batadv_tt_local_entry_put(tt_local);
1228                 }
1229                 spin_unlock_bh(list_lock);
1230         }
1231 
1232         batadv_hash_destroy(hash);
1233 
1234         bat_priv->tt.local_hash = NULL;
1235 }
1236 
1237 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1238 {
1239         if (bat_priv->tt.global_hash)
1240                 return 0;
1241 
1242         bat_priv->tt.global_hash = batadv_hash_new(1024);
1243 
1244         if (!bat_priv->tt.global_hash)
1245                 return -ENOMEM;
1246 
1247         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1248                                    &batadv_tt_global_hash_lock_class_key);
1249 
1250         return 0;
1251 }
1252 
1253 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1254 {
1255         struct batadv_tt_change_node *entry, *safe;
1256 
1257         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1258 
1259         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1260                                  list) {
1261                 list_del(&entry->list);
1262                 kfree(entry);
1263         }
1264 
1265         atomic_set(&bat_priv->tt.local_changes, 0);
1266         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1267 }
1268 
1269 /**
1270  * batadv_tt_global_orig_entry_find - find a TT orig_list_entry
1271  * @entry: the TT global entry where the orig_list_entry has to be
1272  *  extracted from
1273  * @orig_node: the originator for which the orig_list_entry has to be found
1274  *
1275  * retrieve the orig_tt_list_entry belonging to orig_node from the
1276  * batadv_tt_global_entry list
1277  *
1278  * Return: it with an increased refcounter, NULL if not found
1279  */
1280 static struct batadv_tt_orig_list_entry *
1281 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1282                                  const struct batadv_orig_node *orig_node)
1283 {
1284         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1285         const struct hlist_head *head;
1286 
1287         rcu_read_lock();
1288         head = &entry->orig_list;
1289         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1290                 if (tmp_orig_entry->orig_node != orig_node)
1291                         continue;
1292                 if (!kref_get_unless_zero(&tmp_orig_entry->refcount))
1293                         continue;
1294 
1295                 orig_entry = tmp_orig_entry;
1296                 break;
1297         }
1298         rcu_read_unlock();
1299 
1300         return orig_entry;
1301 }
1302 
1303 /**
1304  * batadv_tt_global_entry_has_orig - check if a TT global entry is also handled
1305  *  by a given originator
1306  * @entry: the TT global entry to check
1307  * @orig_node: the originator to search in the list
1308  *
1309  * find out if an orig_node is already in the list of a tt_global_entry.
1310  *
1311  * Return: true if found, false otherwise
1312  */
1313 static bool
1314 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1315                                 const struct batadv_orig_node *orig_node)
1316 {
1317         struct batadv_tt_orig_list_entry *orig_entry;
1318         bool found = false;
1319 
1320         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1321         if (orig_entry) {
1322                 found = true;
1323                 batadv_tt_orig_list_entry_put(orig_entry);
1324         }
1325 
1326         return found;
1327 }
1328 
1329 static void
1330 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1331                                 struct batadv_orig_node *orig_node, int ttvn)
1332 {
1333         struct batadv_tt_orig_list_entry *orig_entry;
1334 
1335         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1336         if (orig_entry) {
1337                 /* refresh the ttvn: the current value could be a bogus one that
1338                  * was added during a "temporary client detection"
1339                  */
1340                 orig_entry->ttvn = ttvn;
1341                 goto out;
1342         }
1343 
1344         orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1345         if (!orig_entry)
1346                 goto out;
1347 
1348         INIT_HLIST_NODE(&orig_entry->list);
1349         kref_get(&orig_node->refcount);
1350         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1351         orig_entry->orig_node = orig_node;
1352         orig_entry->ttvn = ttvn;
1353         kref_init(&orig_entry->refcount);
1354         kref_get(&orig_entry->refcount);
1355 
1356         spin_lock_bh(&tt_global->list_lock);
1357         hlist_add_head_rcu(&orig_entry->list,
1358                            &tt_global->orig_list);
1359         spin_unlock_bh(&tt_global->list_lock);
1360         atomic_inc(&tt_global->orig_list_count);
1361 
1362 out:
1363         if (orig_entry)
1364                 batadv_tt_orig_list_entry_put(orig_entry);
1365 }
1366 
1367 /**
1368  * batadv_tt_global_add - add a new TT global entry or update an existing one
1369  * @bat_priv: the bat priv with all the soft interface information
1370  * @orig_node: the originator announcing the client
1371  * @tt_addr: the mac address of the non-mesh client
1372  * @vid: VLAN identifier
1373  * @flags: TT flags that have to be set for this non-mesh client
1374  * @ttvn: the tt version number ever announcing this non-mesh client
1375  *
1376  * Add a new TT global entry for the given originator. If the entry already
1377  * exists add a new reference to the given originator (a global entry can have
1378  * references to multiple originators) and adjust the flags attribute to reflect
1379  * the function argument.
1380  * If a TT local entry exists for this non-mesh client remove it.
1381  *
1382  * The caller must hold orig_node refcount.
1383  *
1384  * Return: true if the new entry has been added, false otherwise
1385  */
1386 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1387                                  struct batadv_orig_node *orig_node,
1388                                  const unsigned char *tt_addr,
1389                                  unsigned short vid, u16 flags, u8 ttvn)
1390 {
1391         struct batadv_tt_global_entry *tt_global_entry;
1392         struct batadv_tt_local_entry *tt_local_entry;
1393         bool ret = false;
1394         int hash_added;
1395         struct batadv_tt_common_entry *common;
1396         u16 local_flags;
1397 
1398         /* ignore global entries from backbone nodes */
1399         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1400                 return true;
1401 
1402         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1403         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1404 
1405         /* if the node already has a local client for this entry, it has to wait
1406          * for a roaming advertisement instead of manually messing up the global
1407          * table
1408          */
1409         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1410             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1411                 goto out;
1412 
1413         if (!tt_global_entry) {
1414                 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1415                 if (!tt_global_entry)
1416                         goto out;
1417 
1418                 common = &tt_global_entry->common;
1419                 ether_addr_copy(common->addr, tt_addr);
1420                 common->vid = vid;
1421 
1422                 common->flags = flags;
1423                 tt_global_entry->roam_at = 0;
1424                 /* node must store current time in case of roaming. This is
1425                  * needed to purge this entry out on timeout (if nobody claims
1426                  * it)
1427                  */
1428                 if (flags & BATADV_TT_CLIENT_ROAM)
1429                         tt_global_entry->roam_at = jiffies;
1430                 kref_init(&common->refcount);
1431                 kref_get(&common->refcount);
1432                 common->added_at = jiffies;
1433 
1434                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1435                 atomic_set(&tt_global_entry->orig_list_count, 0);
1436                 spin_lock_init(&tt_global_entry->list_lock);
1437 
1438                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1439                                              batadv_compare_tt,
1440                                              batadv_choose_tt, common,
1441                                              &common->hash_entry);
1442 
1443                 if (unlikely(hash_added != 0)) {
1444                         /* remove the reference for the hash */
1445                         batadv_tt_global_entry_put(tt_global_entry);
1446                         goto out_remove;
1447                 }
1448         } else {
1449                 common = &tt_global_entry->common;
1450                 /* If there is already a global entry, we can use this one for
1451                  * our processing.
1452                  * But if we are trying to add a temporary client then here are
1453                  * two options at this point:
1454                  * 1) the global client is not a temporary client: the global
1455                  *    client has to be left as it is, temporary information
1456                  *    should never override any already known client state
1457                  * 2) the global client is a temporary client: purge the
1458                  *    originator list and add the new one orig_entry
1459                  */
1460                 if (flags & BATADV_TT_CLIENT_TEMP) {
1461                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1462                                 goto out;
1463                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1464                                                             orig_node))
1465                                 goto out_remove;
1466                         batadv_tt_global_del_orig_list(tt_global_entry);
1467                         goto add_orig_entry;
1468                 }
1469 
1470                 /* if the client was temporary added before receiving the first
1471                  * OGM announcing it, we have to clear the TEMP flag. Also,
1472                  * remove the previous temporary orig node and re-add it
1473                  * if required. If the orig entry changed, the new one which
1474                  * is a non-temporary entry is preferred.
1475                  */
1476                 if (common->flags & BATADV_TT_CLIENT_TEMP) {
1477                         batadv_tt_global_del_orig_list(tt_global_entry);
1478                         common->flags &= ~BATADV_TT_CLIENT_TEMP;
1479                 }
1480 
1481                 /* the change can carry possible "attribute" flags like the
1482                  * TT_CLIENT_WIFI, therefore they have to be copied in the
1483                  * client entry
1484                  */
1485                 common->flags |= flags;
1486 
1487                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1488                  * one originator left in the list and we previously received a
1489                  * delete + roaming change for this originator.
1490                  *
1491                  * We should first delete the old originator before adding the
1492                  * new one.
1493                  */
1494                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1495                         batadv_tt_global_del_orig_list(tt_global_entry);
1496                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1497                         tt_global_entry->roam_at = 0;
1498                 }
1499         }
1500 add_orig_entry:
1501         /* add the new orig_entry (if needed) or update it */
1502         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1503 
1504         batadv_dbg(BATADV_DBG_TT, bat_priv,
1505                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1506                    common->addr, BATADV_PRINT_VID(common->vid),
1507                    orig_node->orig);
1508         ret = true;
1509 
1510 out_remove:
1511         /* Do not remove multicast addresses from the local hash on
1512          * global additions
1513          */
1514         if (is_multicast_ether_addr(tt_addr))
1515                 goto out;
1516 
1517         /* remove address from local hash if present */
1518         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1519                                              "global tt received",
1520                                              flags & BATADV_TT_CLIENT_ROAM);
1521         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1522 
1523         if (!(flags & BATADV_TT_CLIENT_ROAM))
1524                 /* this is a normal global add. Therefore the client is not in a
1525                  * roaming state anymore.
1526                  */
1527                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1528 
1529 out:
1530         if (tt_global_entry)
1531                 batadv_tt_global_entry_put(tt_global_entry);
1532         if (tt_local_entry)
1533                 batadv_tt_local_entry_put(tt_local_entry);
1534         return ret;
1535 }
1536 
1537 /**
1538  * batadv_transtable_best_orig - Get best originator list entry from tt entry
1539  * @bat_priv: the bat priv with all the soft interface information
1540  * @tt_global_entry: global translation table entry to be analyzed
1541  *
1542  * This functon assumes the caller holds rcu_read_lock().
1543  * Return: best originator list entry or NULL on errors.
1544  */
1545 static struct batadv_tt_orig_list_entry *
1546 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1547                             struct batadv_tt_global_entry *tt_global_entry)
1548 {
1549         struct batadv_neigh_node *router, *best_router = NULL;
1550         struct batadv_algo_ops *bao = bat_priv->algo_ops;
1551         struct hlist_head *head;
1552         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1553 
1554         head = &tt_global_entry->orig_list;
1555         hlist_for_each_entry_rcu(orig_entry, head, list) {
1556                 router = batadv_orig_router_get(orig_entry->orig_node,
1557                                                 BATADV_IF_DEFAULT);
1558                 if (!router)
1559                         continue;
1560 
1561                 if (best_router &&
1562                     bao->neigh.cmp(router, BATADV_IF_DEFAULT, best_router,
1563                                    BATADV_IF_DEFAULT) <= 0) {
1564                         batadv_neigh_node_put(router);
1565                         continue;
1566                 }
1567 
1568                 /* release the refcount for the "old" best */
1569                 if (best_router)
1570                         batadv_neigh_node_put(best_router);
1571 
1572                 best_entry = orig_entry;
1573                 best_router = router;
1574         }
1575 
1576         if (best_router)
1577                 batadv_neigh_node_put(best_router);
1578 
1579         return best_entry;
1580 }
1581 
1582 /**
1583  * batadv_tt_global_print_entry - print all orig nodes who announce the address
1584  *  for this global entry
1585  * @bat_priv: the bat priv with all the soft interface information
1586  * @tt_global_entry: global translation table entry to be printed
1587  * @seq: debugfs table seq_file struct
1588  *
1589  * This functon assumes the caller holds rcu_read_lock().
1590  */
1591 static void
1592 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1593                              struct batadv_tt_global_entry *tt_global_entry,
1594                              struct seq_file *seq)
1595 {
1596         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1597         struct batadv_tt_common_entry *tt_common_entry;
1598         struct batadv_orig_node_vlan *vlan;
1599         struct hlist_head *head;
1600         u8 last_ttvn;
1601         u16 flags;
1602 
1603         tt_common_entry = &tt_global_entry->common;
1604         flags = tt_common_entry->flags;
1605 
1606         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1607         if (best_entry) {
1608                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1609                                                  tt_common_entry->vid);
1610                 if (!vlan) {
1611                         seq_printf(seq,
1612                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1613                                    BATADV_PRINT_VID(tt_common_entry->vid),
1614                                    best_entry->orig_node->orig);
1615                         goto print_list;
1616                 }
1617 
1618                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1619                 seq_printf(seq,
1620                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1621                            '*', tt_global_entry->common.addr,
1622                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1623                            best_entry->ttvn, best_entry->orig_node->orig,
1624                            last_ttvn, vlan->tt.crc,
1625                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1626                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1627                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1628                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1629 
1630                 batadv_orig_node_vlan_put(vlan);
1631         }
1632 
1633 print_list:
1634         head = &tt_global_entry->orig_list;
1635 
1636         hlist_for_each_entry_rcu(orig_entry, head, list) {
1637                 if (best_entry == orig_entry)
1638                         continue;
1639 
1640                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1641                                                  tt_common_entry->vid);
1642                 if (!vlan) {
1643                         seq_printf(seq,
1644                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1645                                    BATADV_PRINT_VID(tt_common_entry->vid),
1646                                    orig_entry->orig_node->orig);
1647                         continue;
1648                 }
1649 
1650                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1651                 seq_printf(seq,
1652                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1653                            '+', tt_global_entry->common.addr,
1654                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1655                            orig_entry->ttvn, orig_entry->orig_node->orig,
1656                            last_ttvn, vlan->tt.crc,
1657                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1658                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1659                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1660                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1661 
1662                 batadv_orig_node_vlan_put(vlan);
1663         }
1664 }
1665 
1666 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1667 {
1668         struct net_device *net_dev = (struct net_device *)seq->private;
1669         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1670         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1671         struct batadv_tt_common_entry *tt_common_entry;
1672         struct batadv_tt_global_entry *tt_global;
1673         struct batadv_hard_iface *primary_if;
1674         struct hlist_head *head;
1675         u32 i;
1676 
1677         primary_if = batadv_seq_print_text_primary_if_get(seq);
1678         if (!primary_if)
1679                 goto out;
1680 
1681         seq_printf(seq,
1682                    "Globally announced TT entries received via the mesh %s\n",
1683                    net_dev->name);
1684         seq_puts(seq,
1685                  "       Client         VID  (TTVN)       Originator      (Curr TTVN) (CRC       ) Flags\n");
1686 
1687         for (i = 0; i < hash->size; i++) {
1688                 head = &hash->table[i];
1689 
1690                 rcu_read_lock();
1691                 hlist_for_each_entry_rcu(tt_common_entry,
1692                                          head, hash_entry) {
1693                         tt_global = container_of(tt_common_entry,
1694                                                  struct batadv_tt_global_entry,
1695                                                  common);
1696                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1697                 }
1698                 rcu_read_unlock();
1699         }
1700 out:
1701         if (primary_if)
1702                 batadv_hardif_put(primary_if);
1703         return 0;
1704 }
1705 
1706 /**
1707  * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
1708  * @tt_global_entry: the global entry to remove the orig_entry from
1709  * @orig_entry: the orig entry to remove and free
1710  *
1711  * Remove an orig_entry from its list in the given tt_global_entry and
1712  * free this orig_entry afterwards.
1713  *
1714  * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
1715  * part of a list.
1716  */
1717 static void
1718 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
1719                                  struct batadv_tt_orig_list_entry *orig_entry)
1720 {
1721         lockdep_assert_held(&tt_global_entry->list_lock);
1722 
1723         batadv_tt_global_size_dec(orig_entry->orig_node,
1724                                   tt_global_entry->common.vid);
1725         atomic_dec(&tt_global_entry->orig_list_count);
1726         /* requires holding tt_global_entry->list_lock and orig_entry->list
1727          * being part of a list
1728          */
1729         hlist_del_rcu(&orig_entry->list);
1730         batadv_tt_orig_list_entry_put(orig_entry);
1731 }
1732 
1733 /* deletes the orig list of a tt_global_entry */
1734 static void
1735 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1736 {
1737         struct hlist_head *head;
1738         struct hlist_node *safe;
1739         struct batadv_tt_orig_list_entry *orig_entry;
1740 
1741         spin_lock_bh(&tt_global_entry->list_lock);
1742         head = &tt_global_entry->orig_list;
1743         hlist_for_each_entry_safe(orig_entry, safe, head, list)
1744                 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
1745         spin_unlock_bh(&tt_global_entry->list_lock);
1746 }
1747 
1748 /**
1749  * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1750  * @bat_priv: the bat priv with all the soft interface information
1751  * @tt_global_entry: the global entry to remove the orig_node from
1752  * @orig_node: the originator announcing the client
1753  * @message: message to append to the log on deletion
1754  *
1755  * Remove the given orig_node and its according orig_entry from the given
1756  * global tt entry.
1757  */
1758 static void
1759 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
1760                                struct batadv_tt_global_entry *tt_global_entry,
1761                                struct batadv_orig_node *orig_node,
1762                                const char *message)
1763 {
1764         struct hlist_head *head;
1765         struct hlist_node *safe;
1766         struct batadv_tt_orig_list_entry *orig_entry;
1767         unsigned short vid;
1768 
1769         spin_lock_bh(&tt_global_entry->list_lock);
1770         head = &tt_global_entry->orig_list;
1771         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1772                 if (orig_entry->orig_node == orig_node) {
1773                         vid = tt_global_entry->common.vid;
1774                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1775                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1776                                    orig_node->orig,
1777                                    tt_global_entry->common.addr,
1778                                    BATADV_PRINT_VID(vid), message);
1779                         _batadv_tt_global_del_orig_entry(tt_global_entry,
1780                                                          orig_entry);
1781                 }
1782         }
1783         spin_unlock_bh(&tt_global_entry->list_lock);
1784 }
1785 
1786 /* If the client is to be deleted, we check if it is the last origantor entry
1787  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1788  * timer, otherwise we simply remove the originator scheduled for deletion.
1789  */
1790 static void
1791 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1792                              struct batadv_tt_global_entry *tt_global_entry,
1793                              struct batadv_orig_node *orig_node,
1794                              const char *message)
1795 {
1796         bool last_entry = true;
1797         struct hlist_head *head;
1798         struct batadv_tt_orig_list_entry *orig_entry;
1799 
1800         /* no local entry exists, case 1:
1801          * Check if this is the last one or if other entries exist.
1802          */
1803 
1804         rcu_read_lock();
1805         head = &tt_global_entry->orig_list;
1806         hlist_for_each_entry_rcu(orig_entry, head, list) {
1807                 if (orig_entry->orig_node != orig_node) {
1808                         last_entry = false;
1809                         break;
1810                 }
1811         }
1812         rcu_read_unlock();
1813 
1814         if (last_entry) {
1815                 /* its the last one, mark for roaming. */
1816                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1817                 tt_global_entry->roam_at = jiffies;
1818         } else
1819                 /* there is another entry, we can simply delete this
1820                  * one and can still use the other one.
1821                  */
1822                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1823                                                orig_node, message);
1824 }
1825 
1826 /**
1827  * batadv_tt_global_del - remove a client from the global table
1828  * @bat_priv: the bat priv with all the soft interface information
1829  * @orig_node: an originator serving this client
1830  * @addr: the mac address of the client
1831  * @vid: VLAN identifier
1832  * @message: a message explaining the reason for deleting the client to print
1833  *  for debugging purpose
1834  * @roaming: true if the deletion has been triggered by a roaming event
1835  */
1836 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1837                                  struct batadv_orig_node *orig_node,
1838                                  const unsigned char *addr, unsigned short vid,
1839                                  const char *message, bool roaming)
1840 {
1841         struct batadv_tt_global_entry *tt_global_entry;
1842         struct batadv_tt_local_entry *local_entry = NULL;
1843 
1844         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1845         if (!tt_global_entry)
1846                 goto out;
1847 
1848         if (!roaming) {
1849                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1850                                                orig_node, message);
1851 
1852                 if (hlist_empty(&tt_global_entry->orig_list))
1853                         batadv_tt_global_free(bat_priv, tt_global_entry,
1854                                               message);
1855 
1856                 goto out;
1857         }
1858 
1859         /* if we are deleting a global entry due to a roam
1860          * event, there are two possibilities:
1861          * 1) the client roamed from node A to node B => if there
1862          *    is only one originator left for this client, we mark
1863          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1864          *    wait for node B to claim it. In case of timeout
1865          *    the entry is purged.
1866          *
1867          *    If there are other originators left, we directly delete
1868          *    the originator.
1869          * 2) the client roamed to us => we can directly delete
1870          *    the global entry, since it is useless now.
1871          */
1872         local_entry = batadv_tt_local_hash_find(bat_priv,
1873                                                 tt_global_entry->common.addr,
1874                                                 vid);
1875         if (local_entry) {
1876                 /* local entry exists, case 2: client roamed to us. */
1877                 batadv_tt_global_del_orig_list(tt_global_entry);
1878                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1879         } else
1880                 /* no local entry exists, case 1: check for roaming */
1881                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1882                                              orig_node, message);
1883 
1884 out:
1885         if (tt_global_entry)
1886                 batadv_tt_global_entry_put(tt_global_entry);
1887         if (local_entry)
1888                 batadv_tt_local_entry_put(local_entry);
1889 }
1890 
1891 /**
1892  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1893  *  given originator matching the provided vid
1894  * @bat_priv: the bat priv with all the soft interface information
1895  * @orig_node: the originator owning the entries to remove
1896  * @match_vid: the VLAN identifier to match. If negative all the entries will be
1897  *  removed
1898  * @message: debug message to print as "reason"
1899  */
1900 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1901                                struct batadv_orig_node *orig_node,
1902                                s32 match_vid,
1903                                const char *message)
1904 {
1905         struct batadv_tt_global_entry *tt_global;
1906         struct batadv_tt_common_entry *tt_common_entry;
1907         u32 i;
1908         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1909         struct hlist_node *safe;
1910         struct hlist_head *head;
1911         spinlock_t *list_lock; /* protects write access to the hash lists */
1912         unsigned short vid;
1913 
1914         if (!hash)
1915                 return;
1916 
1917         for (i = 0; i < hash->size; i++) {
1918                 head = &hash->table[i];
1919                 list_lock = &hash->list_locks[i];
1920 
1921                 spin_lock_bh(list_lock);
1922                 hlist_for_each_entry_safe(tt_common_entry, safe,
1923                                           head, hash_entry) {
1924                         /* remove only matching entries */
1925                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1926                                 continue;
1927 
1928                         tt_global = container_of(tt_common_entry,
1929                                                  struct batadv_tt_global_entry,
1930                                                  common);
1931 
1932                         batadv_tt_global_del_orig_node(bat_priv, tt_global,
1933                                                        orig_node, message);
1934 
1935                         if (hlist_empty(&tt_global->orig_list)) {
1936                                 vid = tt_global->common.vid;
1937                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1938                                            "Deleting global tt entry %pM (vid: %d): %s\n",
1939                                            tt_global->common.addr,
1940                                            BATADV_PRINT_VID(vid), message);
1941                                 hlist_del_rcu(&tt_common_entry->hash_entry);
1942                                 batadv_tt_global_entry_put(tt_global);
1943                         }
1944                 }
1945                 spin_unlock_bh(list_lock);
1946         }
1947         clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
1948 }
1949 
1950 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1951                                       char **msg)
1952 {
1953         bool purge = false;
1954         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1955         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1956 
1957         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1958             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1959                 purge = true;
1960                 *msg = "Roaming timeout\n";
1961         }
1962 
1963         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1964             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1965                 purge = true;
1966                 *msg = "Temporary client timeout\n";
1967         }
1968 
1969         return purge;
1970 }
1971 
1972 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1973 {
1974         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1975         struct hlist_head *head;
1976         struct hlist_node *node_tmp;
1977         spinlock_t *list_lock; /* protects write access to the hash lists */
1978         u32 i;
1979         char *msg = NULL;
1980         struct batadv_tt_common_entry *tt_common;
1981         struct batadv_tt_global_entry *tt_global;
1982 
1983         for (i = 0; i < hash->size; i++) {
1984                 head = &hash->table[i];
1985                 list_lock = &hash->list_locks[i];
1986 
1987                 spin_lock_bh(list_lock);
1988                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1989                                           hash_entry) {
1990                         tt_global = container_of(tt_common,
1991                                                  struct batadv_tt_global_entry,
1992                                                  common);
1993 
1994                         if (!batadv_tt_global_to_purge(tt_global, &msg))
1995                                 continue;
1996 
1997                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1998                                    "Deleting global tt entry %pM (vid: %d): %s\n",
1999                                    tt_global->common.addr,
2000                                    BATADV_PRINT_VID(tt_global->common.vid),
2001                                    msg);
2002 
2003                         hlist_del_rcu(&tt_common->hash_entry);
2004 
2005                         batadv_tt_global_entry_put(tt_global);
2006                 }
2007                 spin_unlock_bh(list_lock);
2008         }
2009 }
2010 
2011 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
2012 {
2013         struct batadv_hashtable *hash;
2014         spinlock_t *list_lock; /* protects write access to the hash lists */
2015         struct batadv_tt_common_entry *tt_common_entry;
2016         struct batadv_tt_global_entry *tt_global;
2017         struct hlist_node *node_tmp;
2018         struct hlist_head *head;
2019         u32 i;
2020 
2021         if (!bat_priv->tt.global_hash)
2022                 return;
2023 
2024         hash = bat_priv->tt.global_hash;
2025 
2026         for (i = 0; i < hash->size; i++) {
2027                 head = &hash->table[i];
2028                 list_lock = &hash->list_locks[i];
2029 
2030                 spin_lock_bh(list_lock);
2031                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
2032                                           head, hash_entry) {
2033                         hlist_del_rcu(&tt_common_entry->hash_entry);
2034                         tt_global = container_of(tt_common_entry,
2035                                                  struct batadv_tt_global_entry,
2036                                                  common);
2037                         batadv_tt_global_entry_put(tt_global);
2038                 }
2039                 spin_unlock_bh(list_lock);
2040         }
2041 
2042         batadv_hash_destroy(hash);
2043 
2044         bat_priv->tt.global_hash = NULL;
2045 }
2046 
2047 static bool
2048 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2049                        struct batadv_tt_global_entry *tt_global_entry)
2050 {
2051         bool ret = false;
2052 
2053         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2054             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2055                 ret = true;
2056 
2057         /* check if the two clients are marked as isolated */
2058         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2059             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2060                 ret = true;
2061 
2062         return ret;
2063 }
2064 
2065 /**
2066  * batadv_transtable_search - get the mesh destination for a given client
2067  * @bat_priv: the bat priv with all the soft interface information
2068  * @src: mac address of the source client
2069  * @addr: mac address of the destination client
2070  * @vid: VLAN identifier
2071  *
2072  * Return: a pointer to the originator that was selected as destination in the
2073  * mesh for contacting the client 'addr', NULL otherwise.
2074  * In case of multiple originators serving the same client, the function returns
2075  * the best one (best in terms of metric towards the destination node).
2076  *
2077  * If the two clients are AP isolated the function returns NULL.
2078  */
2079 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2080                                                   const u8 *src,
2081                                                   const u8 *addr,
2082                                                   unsigned short vid)
2083 {
2084         struct batadv_tt_local_entry *tt_local_entry = NULL;
2085         struct batadv_tt_global_entry *tt_global_entry = NULL;
2086         struct batadv_orig_node *orig_node = NULL;
2087         struct batadv_tt_orig_list_entry *best_entry;
2088 
2089         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2090                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2091                 if (!tt_local_entry ||
2092                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2093                         goto out;
2094         }
2095 
2096         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2097         if (!tt_global_entry)
2098                 goto out;
2099 
2100         /* check whether the clients should not communicate due to AP
2101          * isolation
2102          */
2103         if (tt_local_entry &&
2104             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2105                 goto out;
2106 
2107         rcu_read_lock();
2108         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2109         /* found anything? */
2110         if (best_entry)
2111                 orig_node = best_entry->orig_node;
2112         if (orig_node && !kref_get_unless_zero(&orig_node->refcount))
2113                 orig_node = NULL;
2114         rcu_read_unlock();
2115 
2116 out:
2117         if (tt_global_entry)
2118                 batadv_tt_global_entry_put(tt_global_entry);
2119         if (tt_local_entry)
2120                 batadv_tt_local_entry_put(tt_local_entry);
2121 
2122         return orig_node;
2123 }
2124 
2125 /**
2126  * batadv_tt_global_crc - calculates the checksum of the local table belonging
2127  *  to the given orig_node
2128  * @bat_priv: the bat priv with all the soft interface information
2129  * @orig_node: originator for which the CRC should be computed
2130  * @vid: VLAN identifier for which the CRC32 has to be computed
2131  *
2132  * This function computes the checksum for the global table corresponding to a
2133  * specific originator. In particular, the checksum is computed as follows: For
2134  * each client connected to the originator the CRC32C of the MAC address and the
2135  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2136  * together.
2137  *
2138  * The idea behind is that CRC32C should be used as much as possible in order to
2139  * produce a unique hash of the table, but since the order which is used to feed
2140  * the CRC32C function affects the result and since every node in the network
2141  * probably sorts the clients differently, the hash function cannot be directly
2142  * computed over the entire table. Hence the CRC32C is used only on
2143  * the single client entry, while all the results are then xor'ed together
2144  * because the XOR operation can combine them all while trying to reduce the
2145  * noise as much as possible.
2146  *
2147  * Return: the checksum of the global table of a given originator.
2148  */
2149 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2150                                 struct batadv_orig_node *orig_node,
2151                                 unsigned short vid)
2152 {
2153         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2154         struct batadv_tt_common_entry *tt_common;
2155         struct batadv_tt_global_entry *tt_global;
2156         struct hlist_head *head;
2157         u32 i, crc_tmp, crc = 0;
2158         u8 flags;
2159         __be16 tmp_vid;
2160 
2161         for (i = 0; i < hash->size; i++) {
2162                 head = &hash->table[i];
2163 
2164                 rcu_read_lock();
2165                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2166                         tt_global = container_of(tt_common,
2167                                                  struct batadv_tt_global_entry,
2168                                                  common);
2169                         /* compute the CRC only for entries belonging to the
2170                          * VLAN identified by the vid passed as parameter
2171                          */
2172                         if (tt_common->vid != vid)
2173                                 continue;
2174 
2175                         /* Roaming clients are in the global table for
2176                          * consistency only. They don't have to be
2177                          * taken into account while computing the
2178                          * global crc
2179                          */
2180                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2181                                 continue;
2182                         /* Temporary clients have not been announced yet, so
2183                          * they have to be skipped while computing the global
2184                          * crc
2185                          */
2186                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2187                                 continue;
2188 
2189                         /* find out if this global entry is announced by this
2190                          * originator
2191                          */
2192                         if (!batadv_tt_global_entry_has_orig(tt_global,
2193                                                              orig_node))
2194                                 continue;
2195 
2196                         /* use network order to read the VID: this ensures that
2197                          * every node reads the bytes in the same order.
2198                          */
2199                         tmp_vid = htons(tt_common->vid);
2200                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2201 
2202                         /* compute the CRC on flags that have to be kept in sync
2203                          * among nodes
2204                          */
2205                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2206                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2207 
2208                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2209                 }
2210                 rcu_read_unlock();
2211         }
2212 
2213         return crc;
2214 }
2215 
2216 /**
2217  * batadv_tt_local_crc - calculates the checksum of the local table
2218  * @bat_priv: the bat priv with all the soft interface information
2219  * @vid: VLAN identifier for which the CRC32 has to be computed
2220  *
2221  * For details about the computation, please refer to the documentation for
2222  * batadv_tt_global_crc().
2223  *
2224  * Return: the checksum of the local table
2225  */
2226 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2227                                unsigned short vid)
2228 {
2229         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2230         struct batadv_tt_common_entry *tt_common;
2231         struct hlist_head *head;
2232         u32 i, crc_tmp, crc = 0;
2233         u8 flags;
2234         __be16 tmp_vid;
2235 
2236         for (i = 0; i < hash->size; i++) {
2237                 head = &hash->table[i];
2238 
2239                 rcu_read_lock();
2240                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2241                         /* compute the CRC only for entries belonging to the
2242                          * VLAN identified by vid
2243                          */
2244                         if (tt_common->vid != vid)
2245                                 continue;
2246 
2247                         /* not yet committed clients have not to be taken into
2248                          * account while computing the CRC
2249                          */
2250                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2251                                 continue;
2252 
2253                         /* use network order to read the VID: this ensures that
2254                          * every node reads the bytes in the same order.
2255                          */
2256                         tmp_vid = htons(tt_common->vid);
2257                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2258 
2259                         /* compute the CRC on flags that have to be kept in sync
2260                          * among nodes
2261                          */
2262                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2263                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2264 
2265                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2266                 }
2267                 rcu_read_unlock();
2268         }
2269 
2270         return crc;
2271 }
2272 
2273 /**
2274  * batadv_tt_req_node_release - free tt_req node entry
2275  * @ref: kref pointer of the tt req_node entry
2276  */
2277 static void batadv_tt_req_node_release(struct kref *ref)
2278 {
2279         struct batadv_tt_req_node *tt_req_node;
2280 
2281         tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount);
2282 
2283         kfree(tt_req_node);
2284 }
2285 
2286 /**
2287  * batadv_tt_req_node_put - decrement the tt_req_node refcounter and
2288  *  possibly release it
2289  * @tt_req_node: tt_req_node to be free'd
2290  */
2291 static void batadv_tt_req_node_put(struct batadv_tt_req_node *tt_req_node)
2292 {
2293         kref_put(&tt_req_node->refcount, batadv_tt_req_node_release);
2294 }
2295 
2296 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2297 {
2298         struct batadv_tt_req_node *node;
2299         struct hlist_node *safe;
2300 
2301         spin_lock_bh(&bat_priv->tt.req_list_lock);
2302 
2303         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2304                 hlist_del_init(&node->list);
2305                 batadv_tt_req_node_put(node);
2306         }
2307 
2308         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2309 }
2310 
2311 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2312                                        struct batadv_orig_node *orig_node,
2313                                        const void *tt_buff,
2314                                        u16 tt_buff_len)
2315 {
2316         /* Replace the old buffer only if I received something in the
2317          * last OGM (the OGM could carry no changes)
2318          */
2319         spin_lock_bh(&orig_node->tt_buff_lock);
2320         if (tt_buff_len > 0) {
2321                 kfree(orig_node->tt_buff);
2322                 orig_node->tt_buff_len = 0;
2323                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2324                 if (orig_node->tt_buff) {
2325                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2326                         orig_node->tt_buff_len = tt_buff_len;
2327                 }
2328         }
2329         spin_unlock_bh(&orig_node->tt_buff_lock);
2330 }
2331 
2332 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2333 {
2334         struct batadv_tt_req_node *node;
2335         struct hlist_node *safe;
2336 
2337         spin_lock_bh(&bat_priv->tt.req_list_lock);
2338         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2339                 if (batadv_has_timed_out(node->issued_at,
2340                                          BATADV_TT_REQUEST_TIMEOUT)) {
2341                         hlist_del_init(&node->list);
2342                         batadv_tt_req_node_put(node);
2343                 }
2344         }
2345         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2346 }
2347 
2348 /**
2349  * batadv_tt_req_node_new - search and possibly create a tt_req_node object
2350  * @bat_priv: the bat priv with all the soft interface information
2351  * @orig_node: orig node this request is being issued for
2352  *
2353  * Return: the pointer to the new tt_req_node struct if no request
2354  * has already been issued for this orig_node, NULL otherwise.
2355  */
2356 static struct batadv_tt_req_node *
2357 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2358                        struct batadv_orig_node *orig_node)
2359 {
2360         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2361 
2362         spin_lock_bh(&bat_priv->tt.req_list_lock);
2363         hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2364                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2365                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2366                                           BATADV_TT_REQUEST_TIMEOUT))
2367                         goto unlock;
2368         }
2369 
2370         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2371         if (!tt_req_node)
2372                 goto unlock;
2373 
2374         kref_init(&tt_req_node->refcount);
2375         ether_addr_copy(tt_req_node->addr, orig_node->orig);
2376         tt_req_node->issued_at = jiffies;
2377 
2378         kref_get(&tt_req_node->refcount);
2379         hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2380 unlock:
2381         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2382         return tt_req_node;
2383 }
2384 
2385 /**
2386  * batadv_tt_local_valid - verify that given tt entry is a valid one
2387  * @entry_ptr: to be checked local tt entry
2388  * @data_ptr: not used but definition required to satisfy the callback prototype
2389  *
2390  * Return: true if the entry is a valid, false otherwise.
2391  */
2392 static bool batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2393 {
2394         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2395 
2396         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2397                 return false;
2398         return true;
2399 }
2400 
2401 static bool batadv_tt_global_valid(const void *entry_ptr,
2402                                    const void *data_ptr)
2403 {
2404         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2405         const struct batadv_tt_global_entry *tt_global_entry;
2406         const struct batadv_orig_node *orig_node = data_ptr;
2407 
2408         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2409             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2410                 return false;
2411 
2412         tt_global_entry = container_of(tt_common_entry,
2413                                        struct batadv_tt_global_entry,
2414                                        common);
2415 
2416         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2417 }
2418 
2419 /**
2420  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2421  *  specified tt hash
2422  * @bat_priv: the bat priv with all the soft interface information
2423  * @hash: hash table containing the tt entries
2424  * @tt_len: expected tvlv tt data buffer length in number of bytes
2425  * @tvlv_buff: pointer to the buffer to fill with the TT data
2426  * @valid_cb: function to filter tt change entries
2427  * @cb_data: data passed to the filter function as argument
2428  */
2429 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2430                                     struct batadv_hashtable *hash,
2431                                     void *tvlv_buff, u16 tt_len,
2432                                     bool (*valid_cb)(const void *,
2433                                                      const void *),
2434                                     void *cb_data)
2435 {
2436         struct batadv_tt_common_entry *tt_common_entry;
2437         struct batadv_tvlv_tt_change *tt_change;
2438         struct hlist_head *head;
2439         u16 tt_tot, tt_num_entries = 0;
2440         u32 i;
2441 
2442         tt_tot = batadv_tt_entries(tt_len);
2443         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2444 
2445         rcu_read_lock();
2446         for (i = 0; i < hash->size; i++) {
2447                 head = &hash->table[i];
2448 
2449                 hlist_for_each_entry_rcu(tt_common_entry,
2450                                          head, hash_entry) {
2451                         if (tt_tot == tt_num_entries)
2452                                 break;
2453 
2454                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2455                                 continue;
2456 
2457                         ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2458                         tt_change->flags = tt_common_entry->flags;
2459                         tt_change->vid = htons(tt_common_entry->vid);
2460                         memset(tt_change->reserved, 0,
2461                                sizeof(tt_change->reserved));
2462 
2463                         tt_num_entries++;
2464                         tt_change++;
2465                 }
2466         }
2467         rcu_read_unlock();
2468 }
2469 
2470 /**
2471  * batadv_tt_global_check_crc - check if all the CRCs are correct
2472  * @orig_node: originator for which the CRCs have to be checked
2473  * @tt_vlan: pointer to the first tvlv VLAN entry
2474  * @num_vlan: number of tvlv VLAN entries
2475  *
2476  * Return: true if all the received CRCs match the locally stored ones, false
2477  * otherwise
2478  */
2479 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2480                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2481                                        u16 num_vlan)
2482 {
2483         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2484         struct batadv_orig_node_vlan *vlan;
2485         int i, orig_num_vlan;
2486         u32 crc;
2487 
2488         /* check if each received CRC matches the locally stored one */
2489         for (i = 0; i < num_vlan; i++) {
2490                 tt_vlan_tmp = tt_vlan + i;
2491 
2492                 /* if orig_node is a backbone node for this VLAN, don't check
2493                  * the CRC as we ignore all the global entries over it
2494                  */
2495                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2496                                                    orig_node->orig,
2497                                                    ntohs(tt_vlan_tmp->vid)))
2498                         continue;
2499 
2500                 vlan = batadv_orig_node_vlan_get(orig_node,
2501                                                  ntohs(tt_vlan_tmp->vid));
2502                 if (!vlan)
2503                         return false;
2504 
2505                 crc = vlan->tt.crc;
2506                 batadv_orig_node_vlan_put(vlan);
2507 
2508                 if (crc != ntohl(tt_vlan_tmp->crc))
2509                         return false;
2510         }
2511 
2512         /* check if any excess VLANs exist locally for the originator
2513          * which are not mentioned in the TVLV from the originator.
2514          */
2515         rcu_read_lock();
2516         orig_num_vlan = 0;
2517         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
2518                 orig_num_vlan++;
2519         rcu_read_unlock();
2520 
2521         if (orig_num_vlan > num_vlan)
2522                 return false;
2523 
2524         return true;
2525 }
2526 
2527 /**
2528  * batadv_tt_local_update_crc - update all the local CRCs
2529  * @bat_priv: the bat priv with all the soft interface information
2530  */
2531 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2532 {
2533         struct batadv_softif_vlan *vlan;
2534 
2535         /* recompute the global CRC for each VLAN */
2536         rcu_read_lock();
2537         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2538                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2539         }
2540         rcu_read_unlock();
2541 }
2542 
2543 /**
2544  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2545  * @bat_priv: the bat priv with all the soft interface information
2546  * @orig_node: the orig_node for which the CRCs have to be updated
2547  */
2548 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2549                                         struct batadv_orig_node *orig_node)
2550 {
2551         struct batadv_orig_node_vlan *vlan;
2552         u32 crc;
2553 
2554         /* recompute the global CRC for each VLAN */
2555         rcu_read_lock();
2556         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2557                 /* if orig_node is a backbone node for this VLAN, don't compute
2558                  * the CRC as we ignore all the global entries over it
2559                  */
2560                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2561                                                    vlan->vid))
2562                         continue;
2563 
2564                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2565                 vlan->tt.crc = crc;
2566         }
2567         rcu_read_unlock();
2568 }
2569 
2570 /**
2571  * batadv_send_tt_request - send a TT Request message to a given node
2572  * @bat_priv: the bat priv with all the soft interface information
2573  * @dst_orig_node: the destination of the message
2574  * @ttvn: the version number that the source of the message is looking for
2575  * @tt_vlan: pointer to the first tvlv VLAN object to request
2576  * @num_vlan: number of tvlv VLAN entries
2577  * @full_table: ask for the entire translation table if true, while only for the
2578  *  last TT diff otherwise
2579  *
2580  * Return: true if the TT Request was sent, false otherwise
2581  */
2582 static bool batadv_send_tt_request(struct batadv_priv *bat_priv,
2583                                    struct batadv_orig_node *dst_orig_node,
2584                                    u8 ttvn,
2585                                    struct batadv_tvlv_tt_vlan_data *tt_vlan,
2586                                    u16 num_vlan, bool full_table)
2587 {
2588         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2589         struct batadv_tt_req_node *tt_req_node = NULL;
2590         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2591         struct batadv_hard_iface *primary_if;
2592         bool ret = false;
2593         int i, size;
2594 
2595         primary_if = batadv_primary_if_get_selected(bat_priv);
2596         if (!primary_if)
2597                 goto out;
2598 
2599         /* The new tt_req will be issued only if I'm not waiting for a
2600          * reply from the same orig_node yet
2601          */
2602         tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
2603         if (!tt_req_node)
2604                 goto out;
2605 
2606         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2607         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2608         if (!tvlv_tt_data)
2609                 goto out;
2610 
2611         tvlv_tt_data->flags = BATADV_TT_REQUEST;
2612         tvlv_tt_data->ttvn = ttvn;
2613         tvlv_tt_data->num_vlan = htons(num_vlan);
2614 
2615         /* send all the CRCs within the request. This is needed by intermediate
2616          * nodes to ensure they have the correct table before replying
2617          */
2618         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2619         for (i = 0; i < num_vlan; i++) {
2620                 tt_vlan_req->vid = tt_vlan->vid;
2621                 tt_vlan_req->crc = tt_vlan->crc;
2622 
2623                 tt_vlan_req++;
2624                 tt_vlan++;
2625         }
2626 
2627         if (full_table)
2628                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2629 
2630         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2631                    dst_orig_node->orig, full_table ? 'F' : '.');
2632 
2633         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2634         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2635                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
2636                                  tvlv_tt_data, size);
2637         ret = true;
2638 
2639 out:
2640         if (primary_if)
2641                 batadv_hardif_put(primary_if);
2642 
2643         if (ret && tt_req_node) {
2644                 spin_lock_bh(&bat_priv->tt.req_list_lock);
2645                 if (!hlist_unhashed(&tt_req_node->list)) {
2646                         hlist_del_init(&tt_req_node->list);
2647                         batadv_tt_req_node_put(tt_req_node);
2648                 }
2649                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2650         }
2651 
2652         if (tt_req_node)
2653                 batadv_tt_req_node_put(tt_req_node);
2654 
2655         kfree(tvlv_tt_data);
2656         return ret;
2657 }
2658 
2659 /**
2660  * batadv_send_other_tt_response - send reply to tt request concerning another
2661  *  node's translation table
2662  * @bat_priv: the bat priv with all the soft interface information
2663  * @tt_data: tt data containing the tt request information
2664  * @req_src: mac address of tt request sender
2665  * @req_dst: mac address of tt request recipient
2666  *
2667  * Return: true if tt request reply was sent, false otherwise.
2668  */
2669 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2670                                           struct batadv_tvlv_tt_data *tt_data,
2671                                           u8 *req_src, u8 *req_dst)
2672 {
2673         struct batadv_orig_node *req_dst_orig_node;
2674         struct batadv_orig_node *res_dst_orig_node = NULL;
2675         struct batadv_tvlv_tt_change *tt_change;
2676         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2677         struct batadv_tvlv_tt_vlan_data *tt_vlan;
2678         bool ret = false, full_table;
2679         u8 orig_ttvn, req_ttvn;
2680         u16 tvlv_len;
2681         s32 tt_len;
2682 
2683         batadv_dbg(BATADV_DBG_TT, bat_priv,
2684                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2685                    req_src, tt_data->ttvn, req_dst,
2686                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2687 
2688         /* Let's get the orig node of the REAL destination */
2689         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2690         if (!req_dst_orig_node)
2691                 goto out;
2692 
2693         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2694         if (!res_dst_orig_node)
2695                 goto out;
2696 
2697         orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
2698         req_ttvn = tt_data->ttvn;
2699 
2700         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2701         /* this node doesn't have the requested data */
2702         if (orig_ttvn != req_ttvn ||
2703             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2704                                         ntohs(tt_data->num_vlan)))
2705                 goto out;
2706 
2707         /* If the full table has been explicitly requested */
2708         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2709             !req_dst_orig_node->tt_buff)
2710                 full_table = true;
2711         else
2712                 full_table = false;
2713 
2714         /* TT fragmentation hasn't been implemented yet, so send as many
2715          * TT entries fit a single packet as possible only
2716          */
2717         if (!full_table) {
2718                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2719                 tt_len = req_dst_orig_node->tt_buff_len;
2720 
2721                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2722                                                               &tvlv_tt_data,
2723                                                               &tt_change,
2724                                                               &tt_len);
2725                 if (!tt_len)
2726                         goto unlock;
2727 
2728                 /* Copy the last orig_node's OGM buffer */
2729                 memcpy(tt_change, req_dst_orig_node->tt_buff,
2730                        req_dst_orig_node->tt_buff_len);
2731                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2732         } else {
2733                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2734                  * in the initial part
2735                  */
2736                 tt_len = -1;
2737                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2738                                                               &tvlv_tt_data,
2739                                                               &tt_change,
2740                                                               &tt_len);
2741                 if (!tt_len)
2742                         goto out;
2743 
2744                 /* fill the rest of the tvlv with the real TT entries */
2745                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2746                                         tt_change, tt_len,
2747                                         batadv_tt_global_valid,
2748                                         req_dst_orig_node);
2749         }
2750 
2751         /* Don't send the response, if larger than fragmented packet. */
2752         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2753         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2754                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2755                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2756                                          res_dst_orig_node->orig);
2757                 goto out;
2758         }
2759 
2760         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2761         tvlv_tt_data->ttvn = req_ttvn;
2762 
2763         if (full_table)
2764                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2765 
2766         batadv_dbg(BATADV_DBG_TT, bat_priv,
2767                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2768                    res_dst_orig_node->orig, req_dst_orig_node->orig,
2769                    full_table ? 'F' : '.', req_ttvn);
2770 
2771         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2772 
2773         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2774                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2775                                  tvlv_len);
2776 
2777         ret = true;
2778         goto out;
2779 
2780 unlock:
2781         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2782 
2783 out:
2784         if (res_dst_orig_node)
2785                 batadv_orig_node_put(res_dst_orig_node);
2786         if (req_dst_orig_node)
2787                 batadv_orig_node_put(req_dst_orig_node);
2788         kfree(tvlv_tt_data);
2789         return ret;
2790 }
2791 
2792 /**
2793  * batadv_send_my_tt_response - send reply to tt request concerning this node's
2794  *  translation table
2795  * @bat_priv: the bat priv with all the soft interface information
2796  * @tt_data: tt data containing the tt request information
2797  * @req_src: mac address of tt request sender
2798  *
2799  * Return: true if tt request reply was sent, false otherwise.
2800  */
2801 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2802                                        struct batadv_tvlv_tt_data *tt_data,
2803                                        u8 *req_src)
2804 {
2805         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2806         struct batadv_hard_iface *primary_if = NULL;
2807         struct batadv_tvlv_tt_change *tt_change;
2808         struct batadv_orig_node *orig_node;
2809         u8 my_ttvn, req_ttvn;
2810         u16 tvlv_len;
2811         bool full_table;
2812         s32 tt_len;
2813 
2814         batadv_dbg(BATADV_DBG_TT, bat_priv,
2815                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2816                    req_src, tt_data->ttvn,
2817                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2818 
2819         spin_lock_bh(&bat_priv->tt.commit_lock);
2820 
2821         my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2822         req_ttvn = tt_data->ttvn;
2823 
2824         orig_node = batadv_orig_hash_find(bat_priv, req_src);
2825         if (!orig_node)
2826                 goto out;
2827 
2828         primary_if = batadv_primary_if_get_selected(bat_priv);
2829         if (!primary_if)
2830                 goto out;
2831 
2832         /* If the full table has been explicitly requested or the gap
2833          * is too big send the whole local translation table
2834          */
2835         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2836             !bat_priv->tt.last_changeset)
2837                 full_table = true;
2838         else
2839                 full_table = false;
2840 
2841         /* TT fragmentation hasn't been implemented yet, so send as many
2842          * TT entries fit a single packet as possible only
2843          */
2844         if (!full_table) {
2845                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2846 
2847                 tt_len = bat_priv->tt.last_changeset_len;
2848                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2849                                                              &tvlv_tt_data,
2850                                                              &tt_change,
2851                                                              &tt_len);
2852                 if (!tt_len || !tvlv_len)
2853                         goto unlock;
2854 
2855                 /* Copy the last orig_node's OGM buffer */
2856                 memcpy(tt_change, bat_priv->tt.last_changeset,
2857                        bat_priv->tt.last_changeset_len);
2858                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2859         } else {
2860                 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2861 
2862                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2863                  * in the initial part
2864                  */
2865                 tt_len = -1;
2866                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2867                                                              &tvlv_tt_data,
2868                                                              &tt_change,
2869                                                              &tt_len);
2870                 if (!tt_len || !tvlv_len)
2871                         goto out;
2872 
2873                 /* fill the rest of the tvlv with the real TT entries */
2874                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2875                                         tt_change, tt_len,
2876                                         batadv_tt_local_valid, NULL);
2877         }
2878 
2879         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2880         tvlv_tt_data->ttvn = req_ttvn;
2881 
2882         if (full_table)
2883                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2884 
2885         batadv_dbg(BATADV_DBG_TT, bat_priv,
2886                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2887                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2888 
2889         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2890 
2891         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2892                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2893                                  tvlv_len);
2894 
2895         goto out;
2896 
2897 unlock:
2898         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2899 out:
2900         spin_unlock_bh(&bat_priv->tt.commit_lock);
2901         if (orig_node)
2902                 batadv_orig_node_put(orig_node);
2903         if (primary_if)
2904                 batadv_hardif_put(primary_if);
2905         kfree(tvlv_tt_data);
2906         /* The packet was for this host, so it doesn't need to be re-routed */
2907         return true;
2908 }
2909 
2910 /**
2911  * batadv_send_tt_response - send reply to tt request
2912  * @bat_priv: the bat priv with all the soft interface information
2913  * @tt_data: tt data containing the tt request information
2914  * @req_src: mac address of tt request sender
2915  * @req_dst: mac address of tt request recipient
2916  *
2917  * Return: true if tt request reply was sent, false otherwise.
2918  */
2919 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2920                                     struct batadv_tvlv_tt_data *tt_data,
2921                                     u8 *req_src, u8 *req_dst)
2922 {
2923         if (batadv_is_my_mac(bat_priv, req_dst))
2924                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2925         return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
2926                                              req_dst);
2927 }
2928 
2929 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2930                                       struct batadv_orig_node *orig_node,
2931                                       struct batadv_tvlv_tt_change *tt_change,
2932                                       u16 tt_num_changes, u8 ttvn)
2933 {
2934         int i;
2935         int roams;
2936 
2937         for (i = 0; i < tt_num_changes; i++) {
2938                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2939                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2940                         batadv_tt_global_del(bat_priv, orig_node,
2941                                              (tt_change + i)->addr,
2942                                              ntohs((tt_change + i)->vid),
2943                                              "tt removed by changes",
2944                                              roams);
2945                 } else {
2946                         if (!batadv_tt_global_add(bat_priv, orig_node,
2947                                                   (tt_change + i)->addr,
2948                                                   ntohs((tt_change + i)->vid),
2949                                                   (tt_change + i)->flags, ttvn))
2950                                 /* In case of problem while storing a
2951                                  * global_entry, we stop the updating
2952                                  * procedure without committing the
2953                                  * ttvn change. This will avoid to send
2954                                  * corrupted data on tt_request
2955                                  */
2956                                 return;
2957                 }
2958         }
2959         set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2960 }
2961 
2962 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2963                                   struct batadv_tvlv_tt_change *tt_change,
2964                                   u8 ttvn, u8 *resp_src,
2965                                   u16 num_entries)
2966 {
2967         struct batadv_orig_node *orig_node;
2968 
2969         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2970         if (!orig_node)
2971                 goto out;
2972 
2973         /* Purge the old table first.. */
2974         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2975                                   "Received full table");
2976 
2977         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2978                                   ttvn);
2979 
2980         spin_lock_bh(&orig_node->tt_buff_lock);
2981         kfree(orig_node->tt_buff);
2982         orig_node->tt_buff_len = 0;
2983         orig_node->tt_buff = NULL;
2984         spin_unlock_bh(&orig_node->tt_buff_lock);
2985 
2986         atomic_set(&orig_node->last_ttvn, ttvn);
2987 
2988 out:
2989         if (orig_node)
2990                 batadv_orig_node_put(orig_node);
2991 }
2992 
2993 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2994                                      struct batadv_orig_node *orig_node,
2995                                      u16 tt_num_changes, u8 ttvn,
2996                                      struct batadv_tvlv_tt_change *tt_change)
2997 {
2998         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2999                                   tt_num_changes, ttvn);
3000 
3001         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
3002                                    batadv_tt_len(tt_num_changes));
3003         atomic_set(&orig_node->last_ttvn, ttvn);
3004 }
3005 
3006 /**
3007  * batadv_is_my_client - check if a client is served by the local node
3008  * @bat_priv: the bat priv with all the soft interface information
3009  * @addr: the mac address of the client to check
3010  * @vid: VLAN identifier
3011  *
3012  * Return: true if the client is served by this node, false otherwise.
3013  */
3014 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
3015                          unsigned short vid)
3016 {
3017         struct batadv_tt_local_entry *tt_local_entry;
3018         bool ret = false;
3019 
3020         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3021         if (!tt_local_entry)
3022                 goto out;
3023         /* Check if the client has been logically deleted (but is kept for
3024          * consistency purpose)
3025          */
3026         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
3027             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
3028                 goto out;
3029         ret = true;
3030 out:
3031         if (tt_local_entry)
3032                 batadv_tt_local_entry_put(tt_local_entry);
3033         return ret;
3034 }
3035 
3036 /**
3037  * batadv_handle_tt_response - process incoming tt reply
3038  * @bat_priv: the bat priv with all the soft interface information
3039  * @tt_data: tt data containing the tt request information
3040  * @resp_src: mac address of tt reply sender
3041  * @num_entries: number of tt change entries appended to the tt data
3042  */
3043 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
3044                                       struct batadv_tvlv_tt_data *tt_data,
3045                                       u8 *resp_src, u16 num_entries)
3046 {
3047         struct batadv_tt_req_node *node;
3048         struct hlist_node *safe;
3049         struct batadv_orig_node *orig_node = NULL;
3050         struct batadv_tvlv_tt_change *tt_change;
3051         u8 *tvlv_ptr = (u8 *)tt_data;
3052         u16 change_offset;
3053 
3054         batadv_dbg(BATADV_DBG_TT, bat_priv,
3055                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
3056                    resp_src, tt_data->ttvn, num_entries,
3057                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3058 
3059         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3060         if (!orig_node)
3061                 goto out;
3062 
3063         spin_lock_bh(&orig_node->tt_lock);
3064 
3065         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
3066         change_offset *= ntohs(tt_data->num_vlan);
3067         change_offset += sizeof(*tt_data);
3068         tvlv_ptr += change_offset;
3069 
3070         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
3071         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
3072                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3073                                       resp_src, num_entries);
3074         } else {
3075                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3076                                          tt_data->ttvn, tt_change);
3077         }
3078 
3079         /* Recalculate the CRC for this orig_node and store it */
3080         batadv_tt_global_update_crc(bat_priv, orig_node);
3081 
3082         spin_unlock_bh(&orig_node->tt_lock);
3083 
3084         /* Delete the tt_req_node from pending tt_requests list */
3085         spin_lock_bh(&bat_priv->tt.req_list_lock);
3086         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3087                 if (!batadv_compare_eth(node->addr, resp_src))
3088                         continue;
3089                 hlist_del_init(&node->list);
3090                 batadv_tt_req_node_put(node);
3091         }
3092 
3093         spin_unlock_bh(&bat_priv->tt.req_list_lock);
3094 out:
3095         if (orig_node)
3096                 batadv_orig_node_put(orig_node);
3097 }
3098 
3099 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3100 {
3101         struct batadv_tt_roam_node *node, *safe;
3102 
3103         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3104 
3105         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3106                 list_del(&node->list);
3107                 kfree(node);
3108         }
3109 
3110         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3111 }
3112 
3113 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3114 {
3115         struct batadv_tt_roam_node *node, *safe;
3116 
3117         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3118         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3119                 if (!batadv_has_timed_out(node->first_time,
3120                                           BATADV_ROAMING_MAX_TIME))
3121                         continue;
3122 
3123                 list_del(&node->list);
3124                 kfree(node);
3125         }
3126         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3127 }
3128 
3129 /**
3130  * batadv_tt_check_roam_count - check if a client has roamed too frequently
3131  * @bat_priv: the bat priv with all the soft interface information
3132  * @client: mac address of the roaming client
3133  *
3134  * This function checks whether the client already reached the
3135  * maximum number of possible roaming phases. In this case the ROAMING_ADV
3136  * will not be sent.
3137  *
3138  * Return: true if the ROAMING_ADV can be sent, false otherwise
3139  */
3140 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3141 {
3142         struct batadv_tt_roam_node *tt_roam_node;
3143         bool ret = false;
3144 
3145         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3146         /* The new tt_req will be issued only if I'm not waiting for a
3147          * reply from the same orig_node yet
3148          */
3149         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3150                 if (!batadv_compare_eth(tt_roam_node->addr, client))
3151                         continue;
3152 
3153                 if (batadv_has_timed_out(tt_roam_node->first_time,
3154                                          BATADV_ROAMING_MAX_TIME))
3155                         continue;
3156 
3157                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3158                         /* Sorry, you roamed too many times! */
3159                         goto unlock;
3160                 ret = true;
3161                 break;
3162         }
3163 
3164         if (!ret) {
3165                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
3166                 if (!tt_roam_node)
3167                         goto unlock;
3168 
3169                 tt_roam_node->first_time = jiffies;
3170                 atomic_set(&tt_roam_node->counter,
3171                            BATADV_ROAMING_MAX_COUNT - 1);
3172                 ether_addr_copy(tt_roam_node->addr, client);
3173 
3174                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3175                 ret = true;
3176         }
3177 
3178 unlock:
3179         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3180         return ret;
3181 }
3182 
3183 /**
3184  * batadv_send_roam_adv - send a roaming advertisement message
3185  * @bat_priv: the bat priv with all the soft interface information
3186  * @client: mac address of the roaming client
3187  * @vid: VLAN identifier
3188  * @orig_node: message destination
3189  *
3190  * Send a ROAMING_ADV message to the node which was previously serving this
3191  * client. This is done to inform the node that from now on all traffic destined
3192  * for this particular roamed client has to be forwarded to the sender of the
3193  * roaming message.
3194  */
3195 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3196                                  unsigned short vid,
3197                                  struct batadv_orig_node *orig_node)
3198 {
3199         struct batadv_hard_iface *primary_if;
3200         struct batadv_tvlv_roam_adv tvlv_roam;
3201 
3202         primary_if = batadv_primary_if_get_selected(bat_priv);
3203         if (!primary_if)
3204                 goto out;
3205 
3206         /* before going on we have to check whether the client has
3207          * already roamed to us too many times
3208          */
3209         if (!batadv_tt_check_roam_count(bat_priv, client))
3210                 goto out;
3211 
3212         batadv_dbg(BATADV_DBG_TT, bat_priv,
3213                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3214                    orig_node->orig, client, BATADV_PRINT_VID(vid));
3215 
3216         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3217 
3218         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3219         tvlv_roam.vid = htons(vid);
3220 
3221         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3222                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
3223                                  &tvlv_roam, sizeof(tvlv_roam));
3224 
3225 out:
3226         if (primary_if)
3227                 batadv_hardif_put(primary_if);
3228 }
3229 
3230 static void batadv_tt_purge(struct work_struct *work)
3231 {
3232         struct delayed_work *delayed_work;
3233         struct batadv_priv_tt *priv_tt;
3234         struct batadv_priv *bat_priv;
3235 
3236         delayed_work = to_delayed_work(work);
3237         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3238         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3239 
3240         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3241         batadv_tt_global_purge(bat_priv);
3242         batadv_tt_req_purge(bat_priv);
3243         batadv_tt_roam_purge(bat_priv);
3244 
3245         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3246                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3247 }
3248 
3249 void batadv_tt_free(struct batadv_priv *bat_priv)
3250 {
3251         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3252         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3253 
3254         cancel_delayed_work_sync(&bat_priv->tt.work);
3255 
3256         batadv_tt_local_table_free(bat_priv);
3257         batadv_tt_global_table_free(bat_priv);
3258         batadv_tt_req_list_free(bat_priv);
3259         batadv_tt_changes_list_free(bat_priv);
3260         batadv_tt_roam_list_free(bat_priv);
3261 
3262         kfree(bat_priv->tt.last_changeset);
3263 }
3264 
3265 /**
3266  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3267  *  table and possibly count them in the TT size
3268  * @bat_priv: the bat priv with all the soft interface information
3269  * @flags: the flag to switch
3270  * @enable: whether to set or unset the flag
3271  * @count: whether to increase the TT size by the number of changed entries
3272  */
3273 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3274                                       bool enable, bool count)
3275 {
3276         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3277         struct batadv_tt_common_entry *tt_common_entry;
3278         u16 changed_num = 0;
3279         struct hlist_head *head;
3280         u32 i;
3281 
3282         if (!hash)
3283                 return;
3284 
3285         for (i = 0; i < hash->size; i++) {
3286                 head = &hash->table[i];
3287 
3288                 rcu_read_lock();
3289                 hlist_for_each_entry_rcu(tt_common_entry,
3290                                          head, hash_entry) {
3291                         if (enable) {
3292                                 if ((tt_common_entry->flags & flags) == flags)
3293                                         continue;
3294                                 tt_common_entry->flags |= flags;
3295                         } else {
3296                                 if (!(tt_common_entry->flags & flags))
3297                                         continue;
3298                                 tt_common_entry->flags &= ~flags;
3299                         }
3300                         changed_num++;
3301 
3302                         if (!count)
3303                                 continue;
3304 
3305                         batadv_tt_local_size_inc(bat_priv,
3306                                                  tt_common_entry->vid);
3307                 }
3308                 rcu_read_unlock();
3309         }
3310 }
3311 
3312 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3313 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3314 {
3315         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3316         struct batadv_tt_common_entry *tt_common;
3317         struct batadv_tt_local_entry *tt_local;
3318         struct hlist_node *node_tmp;
3319         struct hlist_head *head;
3320         spinlock_t *list_lock; /* protects write access to the hash lists */
3321         u32 i;
3322 
3323         if (!hash)
3324                 return;
3325 
3326         for (i = 0; i < hash->size; i++) {
3327                 head = &hash->table[i];
3328                 list_lock = &hash->list_locks[i];
3329 
3330                 spin_lock_bh(list_lock);
3331                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3332                                           hash_entry) {
3333                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3334                                 continue;
3335 
3336                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3337                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3338                                    tt_common->addr,
3339                                    BATADV_PRINT_VID(tt_common->vid));
3340 
3341                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3342                         hlist_del_rcu(&tt_common->hash_entry);
3343                         tt_local = container_of(tt_common,
3344                                                 struct batadv_tt_local_entry,
3345                                                 common);
3346 
3347                         batadv_tt_local_entry_put(tt_local);
3348                 }
3349                 spin_unlock_bh(list_lock);
3350         }
3351 }
3352 
3353 /**
3354  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3355  *  which have been queued in the time since the last commit
3356  * @bat_priv: the bat priv with all the soft interface information
3357  *
3358  * Caller must hold tt->commit_lock.
3359  */
3360 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3361 {
3362         lockdep_assert_held(&bat_priv->tt.commit_lock);
3363 
3364         /* Update multicast addresses in local translation table */
3365         batadv_mcast_mla_update(bat_priv);
3366 
3367         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3368                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3369                         batadv_tt_tvlv_container_update(bat_priv);
3370                 return;
3371         }
3372 
3373         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3374 
3375         batadv_tt_local_purge_pending_clients(bat_priv);
3376         batadv_tt_local_update_crc(bat_priv);
3377 
3378         /* Increment the TTVN only once per OGM interval */
3379         atomic_inc(&bat_priv->tt.vn);
3380         batadv_dbg(BATADV_DBG_TT, bat_priv,
3381                    "Local changes committed, updating to ttvn %u\n",
3382                    (u8)atomic_read(&bat_priv->tt.vn));
3383 
3384         /* reset the sending counter */
3385         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3386         batadv_tt_tvlv_container_update(bat_priv);
3387 }
3388 
3389 /**
3390  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3391  *  have been queued in the time since the last commit
3392  * @bat_priv: the bat priv with all the soft interface information
3393  */
3394 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3395 {
3396         spin_lock_bh(&bat_priv->tt.commit_lock);
3397         batadv_tt_local_commit_changes_nolock(bat_priv);
3398         spin_unlock_bh(&bat_priv->tt.commit_lock);
3399 }
3400 
3401 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3402                            unsigned short vid)
3403 {
3404         struct batadv_tt_local_entry *tt_local_entry = NULL;
3405         struct batadv_tt_global_entry *tt_global_entry = NULL;
3406         struct batadv_softif_vlan *vlan;
3407         bool ret = false;
3408 
3409         vlan = batadv_softif_vlan_get(bat_priv, vid);
3410         if (!vlan)
3411                 return false;
3412 
3413         if (!atomic_read(&vlan->ap_isolation))
3414                 goto out;
3415 
3416         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3417         if (!tt_local_entry)
3418                 goto out;
3419 
3420         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3421         if (!tt_global_entry)
3422                 goto out;
3423 
3424         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3425                 goto out;
3426 
3427         ret = true;
3428 
3429 out:
3430         batadv_softif_vlan_put(vlan);
3431         if (tt_global_entry)
3432                 batadv_tt_global_entry_put(tt_global_entry);
3433         if (tt_local_entry)
3434                 batadv_tt_local_entry_put(tt_local_entry);
3435         return ret;
3436 }
3437 
3438 /**
3439  * batadv_tt_update_orig - update global translation table with new tt
3440  *  information received via ogms
3441  * @bat_priv: the bat priv with all the soft interface information
3442  * @orig_node: the orig_node of the ogm
3443  * @tt_buff: pointer to the first tvlv VLAN entry
3444  * @tt_num_vlan: number of tvlv VLAN entries
3445  * @tt_change: pointer to the first entry in the TT buffer
3446  * @tt_num_changes: number of tt changes inside the tt buffer
3447  * @ttvn: translation table version number of this changeset
3448  */
3449 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3450                                   struct batadv_orig_node *orig_node,
3451                                   const void *tt_buff, u16 tt_num_vlan,
3452                                   struct batadv_tvlv_tt_change *tt_change,
3453                                   u16 tt_num_changes, u8 ttvn)
3454 {
3455         u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
3456         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3457         bool full_table = true;
3458         bool has_tt_init;
3459 
3460         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3461         has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
3462                                &orig_node->capa_initialized);
3463 
3464         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3465          * increased by one -> we can apply the attached changes
3466          */
3467         if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3468                 /* the OGM could not contain the changes due to their size or
3469                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3470                  * times.
3471                  * In this case send a tt request
3472                  */
3473                 if (!tt_num_changes) {
3474                         full_table = false;
3475                         goto request_table;
3476                 }
3477 
3478                 spin_lock_bh(&orig_node->tt_lock);
3479 
3480                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3481                                          ttvn, tt_change);
3482 
3483                 /* Even if we received the precomputed crc with the OGM, we
3484                  * prefer to recompute it to spot any possible inconsistency
3485                  * in the global table
3486                  */
3487                 batadv_tt_global_update_crc(bat_priv, orig_node);
3488 
3489                 spin_unlock_bh(&orig_node->tt_lock);
3490 
3491                 /* The ttvn alone is not enough to guarantee consistency
3492                  * because a single value could represent different states
3493                  * (due to the wrap around). Thus a node has to check whether
3494                  * the resulting table (after applying the changes) is still
3495                  * consistent or not. E.g. a node could disconnect while its
3496                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3497                  * checking the CRC value is mandatory to detect the
3498                  * inconsistency
3499                  */
3500                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3501                                                 tt_num_vlan))
3502                         goto request_table;
3503         } else {
3504                 /* if we missed more than one change or our tables are not
3505                  * in sync anymore -> request fresh tt data
3506                  */
3507                 if (!has_tt_init || ttvn != orig_ttvn ||
3508                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3509                                                 tt_num_vlan)) {
3510 request_table:
3511                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3512                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3513                                    orig_node->orig, ttvn, orig_ttvn,
3514                                    tt_num_changes);
3515                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3516                                                tt_vlan, tt_num_vlan,
3517                                                full_table);
3518                         return;
3519                 }
3520         }
3521 }
3522 
3523 /**
3524  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3525  * @bat_priv: the bat priv with all the soft interface information
3526  * @addr: the mac address of the client to check
3527  * @vid: VLAN identifier
3528  *
3529  * Return: true if we know that the client has moved from its old originator
3530  * to another one. This entry is still kept for consistency purposes and will be
3531  * deleted later by a DEL or because of timeout
3532  */
3533 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3534                                         u8 *addr, unsigned short vid)
3535 {
3536         struct batadv_tt_global_entry *tt_global_entry;
3537         bool ret = false;
3538 
3539         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3540         if (!tt_global_entry)
3541                 goto out;
3542 
3543         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3544         batadv_tt_global_entry_put(tt_global_entry);
3545 out:
3546         return ret;
3547 }
3548 
3549 /**
3550  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3551  * @bat_priv: the bat priv with all the soft interface information
3552  * @addr: the mac address of the local client to query
3553  * @vid: VLAN identifier
3554  *
3555  * Return: true if the local client is known to be roaming (it is not served by
3556  * this node anymore) or not. If yes, the client is still present in the table
3557  * to keep the latter consistent with the node TTVN
3558  */
3559 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3560                                        u8 *addr, unsigned short vid)
3561 {
3562         struct batadv_tt_local_entry *tt_local_entry;
3563         bool ret = false;
3564 
3565         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3566         if (!tt_local_entry)
3567                 goto out;
3568 
3569         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3570         batadv_tt_local_entry_put(tt_local_entry);
3571 out:
3572         return ret;
3573 }
3574 
3575 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3576                                           struct batadv_orig_node *orig_node,
3577                                           const unsigned char *addr,
3578                                           unsigned short vid)
3579 {
3580         bool ret = false;
3581 
3582         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3583                                   BATADV_TT_CLIENT_TEMP,
3584                                   atomic_read(&orig_node->last_ttvn)))
3585                 goto out;
3586 
3587         batadv_dbg(BATADV_DBG_TT, bat_priv,
3588                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3589                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
3590         ret = true;
3591 out:
3592         return ret;
3593 }
3594 
3595 /**
3596  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3597  *  maximum packet size that can be transported through the mesh
3598  * @soft_iface: netdev struct of the mesh interface
3599  *
3600  * Remove entries older than 'timeout' and half timeout if more entries need
3601  * to be removed.
3602  */
3603 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3604 {
3605         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3606         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3607         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3608         bool reduced = false;
3609 
3610         spin_lock_bh(&bat_priv->tt.commit_lock);
3611 
3612         while (true) {
3613                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3614                 if (packet_size_max >= table_size)
3615                         break;
3616 
3617                 batadv_tt_local_purge(bat_priv, timeout);
3618                 batadv_tt_local_purge_pending_clients(bat_priv);
3619 
3620                 timeout /= 2;
3621                 reduced = true;
3622                 net_ratelimited_function(batadv_info, soft_iface,
3623                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3624                                          packet_size_max);
3625         }
3626 
3627         /* commit these changes immediately, to avoid synchronization problem
3628          * with the TTVN
3629          */
3630         if (reduced)
3631                 batadv_tt_local_commit_changes_nolock(bat_priv);
3632 
3633         spin_unlock_bh(&bat_priv->tt.commit_lock);
3634 }
3635 
3636 /**
3637  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3638  * @bat_priv: the bat priv with all the soft interface information
3639  * @orig: the orig_node of the ogm
3640  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3641  * @tvlv_value: tvlv buffer containing the gateway data
3642  * @tvlv_value_len: tvlv buffer length
3643  */
3644 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3645                                           struct batadv_orig_node *orig,
3646                                           u8 flags, void *tvlv_value,
3647                                           u16 tvlv_value_len)
3648 {
3649         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3650         struct batadv_tvlv_tt_change *tt_change;
3651         struct batadv_tvlv_tt_data *tt_data;
3652         u16 num_entries, num_vlan;
3653 
3654         if (tvlv_value_len < sizeof(*tt_data))
3655                 return;
3656 
3657         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3658         tvlv_value_len -= sizeof(*tt_data);
3659 
3660         num_vlan = ntohs(tt_data->num_vlan);
3661 
3662         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3663                 return;
3664 
3665         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3666         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3667         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3668 
3669         num_entries = batadv_tt_entries(tvlv_value_len);
3670 
3671         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3672                               num_entries, tt_data->ttvn);
3673 }
3674 
3675 /**
3676  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3677  *  container
3678  * @bat_priv: the bat priv with all the soft interface information
3679  * @src: mac address of tt tvlv sender
3680  * @dst: mac address of tt tvlv recipient
3681  * @tvlv_value: tvlv buffer containing the tt data
3682  * @tvlv_value_len: tvlv buffer length
3683  *
3684  * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3685  * otherwise.
3686  */
3687 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3688                                              u8 *src, u8 *dst,
3689                                              void *tvlv_value,
3690                                              u16 tvlv_value_len)
3691 {
3692         struct batadv_tvlv_tt_data *tt_data;
3693         u16 tt_vlan_len, tt_num_entries;
3694         char tt_flag;
3695         bool ret;
3696 
3697         if (tvlv_value_len < sizeof(*tt_data))
3698                 return NET_RX_SUCCESS;
3699 
3700         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3701         tvlv_value_len -= sizeof(*tt_data);
3702 
3703         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3704         tt_vlan_len *= ntohs(tt_data->num_vlan);
3705 
3706         if (tvlv_value_len < tt_vlan_len)
3707                 return NET_RX_SUCCESS;
3708 
3709         tvlv_value_len -= tt_vlan_len;
3710         tt_num_entries = batadv_tt_entries(tvlv_value_len);
3711 
3712         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3713         case BATADV_TT_REQUEST:
3714                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3715 
3716                 /* If this node cannot provide a TT response the tt_request is
3717                  * forwarded
3718                  */
3719                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3720                 if (!ret) {
3721                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
3722                                 tt_flag = 'F';
3723                         else
3724                                 tt_flag = '.';
3725 
3726                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3727                                    "Routing TT_REQUEST to %pM [%c]\n",
3728                                    dst, tt_flag);
3729                         /* tvlv API will re-route the packet */
3730                         return NET_RX_DROP;
3731                 }
3732                 break;
3733         case BATADV_TT_RESPONSE:
3734                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3735 
3736                 if (batadv_is_my_mac(bat_priv, dst)) {
3737                         batadv_handle_tt_response(bat_priv, tt_data,
3738                                                   src, tt_num_entries);
3739                         return NET_RX_SUCCESS;
3740                 }
3741 
3742                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3743                         tt_flag =  'F';
3744                 else
3745                         tt_flag = '.';
3746 
3747                 batadv_dbg(BATADV_DBG_TT, bat_priv,
3748                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3749 
3750                 /* tvlv API will re-route the packet */
3751                 return NET_RX_DROP;
3752         }
3753 
3754         return NET_RX_SUCCESS;
3755 }
3756 
3757 /**
3758  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3759  * @bat_priv: the bat priv with all the soft interface information
3760  * @src: mac address of tt tvlv sender
3761  * @dst: mac address of tt tvlv recipient
3762  * @tvlv_value: tvlv buffer containing the tt data
3763  * @tvlv_value_len: tvlv buffer length
3764  *
3765  * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3766  * otherwise.
3767  */
3768 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3769                                                u8 *src, u8 *dst,
3770                                                void *tvlv_value,
3771                                                u16 tvlv_value_len)
3772 {
3773         struct batadv_tvlv_roam_adv *roaming_adv;
3774         struct batadv_orig_node *orig_node = NULL;
3775 
3776         /* If this node is not the intended recipient of the
3777          * roaming advertisement the packet is forwarded
3778          * (the tvlv API will re-route the packet).
3779          */
3780         if (!batadv_is_my_mac(bat_priv, dst))
3781                 return NET_RX_DROP;
3782 
3783         if (tvlv_value_len < sizeof(*roaming_adv))
3784                 goto out;
3785 
3786         orig_node = batadv_orig_hash_find(bat_priv, src);
3787         if (!orig_node)
3788                 goto out;
3789 
3790         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3791         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3792 
3793         batadv_dbg(BATADV_DBG_TT, bat_priv,
3794                    "Received ROAMING_ADV from %pM (client %pM)\n",
3795                    src, roaming_adv->client);
3796 
3797         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3798                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3799                              atomic_read(&orig_node->last_ttvn) + 1);
3800 
3801 out:
3802         if (orig_node)
3803                 batadv_orig_node_put(orig_node);
3804         return NET_RX_SUCCESS;
3805 }
3806 
3807 /**
3808  * batadv_tt_init - initialise the translation table internals
3809  * @bat_priv: the bat priv with all the soft interface information
3810  *
3811  * Return: 0 on success or negative error number in case of failure.
3812  */
3813 int batadv_tt_init(struct batadv_priv *bat_priv)
3814 {
3815         int ret;
3816 
3817         /* synchronized flags must be remote */
3818         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3819 
3820         ret = batadv_tt_local_init(bat_priv);
3821         if (ret < 0)
3822                 return ret;
3823 
3824         ret = batadv_tt_global_init(bat_priv);
3825         if (ret < 0)
3826                 return ret;
3827 
3828         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3829                                      batadv_tt_tvlv_unicast_handler_v1,
3830                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3831 
3832         batadv_tvlv_handler_register(bat_priv, NULL,
3833                                      batadv_roam_tvlv_unicast_handler_v1,
3834                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3835 
3836         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3837         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3838                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3839 
3840         return 1;
3841 }
3842 
3843 /**
3844  * batadv_tt_global_is_isolated - check if a client is marked as isolated
3845  * @bat_priv: the bat priv with all the soft interface information
3846  * @addr: the mac address of the client
3847  * @vid: the identifier of the VLAN where this client is connected
3848  *
3849  * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false
3850  * otherwise
3851  */
3852 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3853                                   const u8 *addr, unsigned short vid)
3854 {
3855         struct batadv_tt_global_entry *tt;
3856         bool ret;
3857 
3858         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3859         if (!tt)
3860                 return false;
3861 
3862         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3863 
3864         batadv_tt_global_entry_put(tt);
3865 
3866         return ret;
3867 }
3868 

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