net/batman-adv/originator.c

   1 /* Copyright (C) 2009-2015 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich
   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 "originator.h"
  19 #include "main.h"
  20
  21 #include <linux/errno.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/fs.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/kernel.h>
  26 #include <linux/list.h>
  27 #include <linux/lockdep.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/rculist.h>
  30 #include <linux/seq_file.h>
  31 #include <linux/slab.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/workqueue.h>
  34
  35 #include "distributed-arp-table.h"
  36 #include "fragmentation.h"
  37 #include "gateway_client.h"
  38 #include "hard-interface.h"
  39 #include "hash.h"
  40 #include "multicast.h"
  41 #include "network-coding.h"
  42 #include "routing.h"
  43 #include "translation-table.h"
  44
  45 /* hash class keys */
  46 static struct lock_class_key batadv_orig_hash_lock_class_key;
  47
  48 static void batadv_purge_orig(struct work_struct *work);
  49
  50 /* returns 1 if they are the same originator */
  51 int batadv_compare_orig(const struct hlist_node *node, const void *data2)
  52 {
  53         const void *data1 = container_of(node, struct batadv_orig_node,
  54                                          hash_entry);
  55
  56         return batadv_compare_eth(data1, data2);
  57 }
  58
  59 /**
  60  * batadv_orig_node_vlan_get - get an orig_node_vlan object
  61  * @orig_node: the originator serving the VLAN
  62  * @vid: the VLAN identifier
  63  *
  64  * Returns the vlan object identified by vid and belonging to orig_node or NULL
  65  * if it does not exist.
  66  */
  67 struct batadv_orig_node_vlan *
  68 batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
  69                           unsigned short vid)
  70 {
  71         struct batadv_orig_node_vlan *vlan = NULL, *tmp;
  72
  73         rcu_read_lock();
  74         hlist_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) {
  75                 if (tmp->vid != vid)
  76                         continue;
  77
  78                 if (!atomic_inc_not_zero(&tmp->refcount))
  79                         continue;
  80
  81                 vlan = tmp;
  82
  83                 break;
  84         }
  85         rcu_read_unlock();
  86
  87         return vlan;
  88 }
  89
  90 /**
  91  * batadv_orig_node_vlan_new - search and possibly create an orig_node_vlan
  92  *  object
  93  * @orig_node: the originator serving the VLAN
  94  * @vid: the VLAN identifier
  95  *
  96  * Returns NULL in case of failure or the vlan object identified by vid and
  97  * belonging to orig_node otherwise. The object is created and added to the list
  98  * if it does not exist.
  99  *
 100  * The object is returned with refcounter increased by 1.
 101  */
 102 struct batadv_orig_node_vlan *
 103 batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
 104                           unsigned short vid)
 105 {
 106         struct batadv_orig_node_vlan *vlan;
 107
 108         spin_lock_bh(&orig_node->vlan_list_lock);
 109
 110         /* first look if an object for this vid already exists */
 111         vlan = batadv_orig_node_vlan_get(orig_node, vid);
 112         if (vlan)
 113                 goto out;
 114
 115         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 116         if (!vlan)
 117                 goto out;
 118
 119         atomic_set(&vlan->refcount, 2);
 120         vlan->vid = vid;
 121
 122         hlist_add_head_rcu(&vlan->list, &orig_node->vlan_list);
 123
 124 out:
 125         spin_unlock_bh(&orig_node->vlan_list_lock);
 126
 127         return vlan;
 128 }
 129
 130 /**
 131  * batadv_orig_node_vlan_free_ref - decrement the refcounter and possibly free
 132  *  the originator-vlan object
 133  * @orig_vlan: the originator-vlan object to release
 134  */
 135 void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan)
 136 {
 137         if (atomic_dec_and_test(&orig_vlan->refcount))
 138                 kfree_rcu(orig_vlan, rcu);
 139 }
 140
 141 int batadv_originator_init(struct batadv_priv *bat_priv)
 142 {
 143         if (bat_priv->orig_hash)
 144                 return 0;
 145
 146         bat_priv->orig_hash = batadv_hash_new(1024);
 147
 148         if (!bat_priv->orig_hash)
 149                 goto err;
 150
 151         batadv_hash_set_lock_class(bat_priv->orig_hash,
 152                                    &batadv_orig_hash_lock_class_key);
 153
 154         INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig);
 155         queue_delayed_work(batadv_event_workqueue,
 156                            &bat_priv->orig_work,
 157                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 158
 159         return 0;
 160
 161 err:
 162         return -ENOMEM;
 163 }
 164
 165 /**
 166  * batadv_neigh_ifinfo_free_rcu - free the neigh_ifinfo object
 167  * @rcu: rcu pointer of the neigh_ifinfo object
 168  */
 169 static void batadv_neigh_ifinfo_free_rcu(struct rcu_head *rcu)
 170 {
 171         struct batadv_neigh_ifinfo *neigh_ifinfo;
 172
 173         neigh_ifinfo = container_of(rcu, struct batadv_neigh_ifinfo, rcu);
 174
 175         if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 176                 batadv_hardif_free_ref_now(neigh_ifinfo->if_outgoing);
 177
 178         kfree(neigh_ifinfo);
 179 }
 180
 181 /**
 182  * batadv_neigh_ifinfo_free_now - decrement the refcounter and possibly free
 183  *  the neigh_ifinfo (without rcu callback)
 184  * @neigh_ifinfo: the neigh_ifinfo object to release
 185  */
 186 static void
 187 batadv_neigh_ifinfo_free_ref_now(struct batadv_neigh_ifinfo *neigh_ifinfo)
 188 {
 189         if (atomic_dec_and_test(&neigh_ifinfo->refcount))
 190                 batadv_neigh_ifinfo_free_rcu(&neigh_ifinfo->rcu);
 191 }
 192
 193 /**
 194  * batadv_neigh_ifinfo_free_ref - decrement the refcounter and possibly free
 195  *  the neigh_ifinfo
 196  * @neigh_ifinfo: the neigh_ifinfo object to release
 197  */
 198 void batadv_neigh_ifinfo_free_ref(struct batadv_neigh_ifinfo *neigh_ifinfo)
 199 {
 200         if (atomic_dec_and_test(&neigh_ifinfo->refcount))
 201                 call_rcu(&neigh_ifinfo->rcu, batadv_neigh_ifinfo_free_rcu);
 202 }
 203
 204 /**
 205  * batadv_hardif_neigh_free_rcu - free the hardif neigh_node
 206  * @rcu: rcu pointer of the neigh_node
 207  */
 208 static void batadv_hardif_neigh_free_rcu(struct rcu_head *rcu)
 209 {
 210         struct batadv_hardif_neigh_node *hardif_neigh;
 211
 212         hardif_neigh = container_of(rcu, struct batadv_hardif_neigh_node, rcu);
 213
 214         spin_lock_bh(&hardif_neigh->if_incoming->neigh_list_lock);
 215         hlist_del_init_rcu(&hardif_neigh->list);
 216         spin_unlock_bh(&hardif_neigh->if_incoming->neigh_list_lock);
 217
 218         batadv_hardif_free_ref_now(hardif_neigh->if_incoming);
 219         kfree(hardif_neigh);
 220 }
 221
 222 /**
 223  * batadv_hardif_neigh_free_now - decrement the hardif neighbors refcounter
 224  *  and possibly free it (without rcu callback)
 225  * @hardif_neigh: hardif neigh neighbor to free
 226  */
 227 static void
 228 batadv_hardif_neigh_free_now(struct batadv_hardif_neigh_node *hardif_neigh)
 229 {
 230         if (atomic_dec_and_test(&hardif_neigh->refcount))
 231                 batadv_hardif_neigh_free_rcu(&hardif_neigh->rcu);
 232 }
 233
 234 /**
 235  * batadv_hardif_neigh_free_ref - decrement the hardif neighbors refcounter
 236  *  and possibly free it
 237  * @hardif_neigh: hardif neigh neighbor to free
 238  */
 239 void batadv_hardif_neigh_free_ref(struct batadv_hardif_neigh_node *hardif_neigh)
 240 {
 241         if (atomic_dec_and_test(&hardif_neigh->refcount))
 242                 call_rcu(&hardif_neigh->rcu, batadv_hardif_neigh_free_rcu);
 243 }
 244
 245 /**
 246  * batadv_neigh_node_free_rcu - free the neigh_node
 247  * @rcu: rcu pointer of the neigh_node
 248  */
 249 static void batadv_neigh_node_free_rcu(struct rcu_head *rcu)
 250 {
 251         struct hlist_node *node_tmp;
 252         struct batadv_neigh_node *neigh_node;
 253         struct batadv_hardif_neigh_node *hardif_neigh;
 254         struct batadv_neigh_ifinfo *neigh_ifinfo;
 255         struct batadv_algo_ops *bao;
 256
 257         neigh_node = container_of(rcu, struct batadv_neigh_node, rcu);
 258         bao = neigh_node->orig_node->bat_priv->bat_algo_ops;
 259
 260         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
 261                                   &neigh_node->ifinfo_list, list) {
 262                 batadv_neigh_ifinfo_free_ref_now(neigh_ifinfo);
 263         }
 264
 265         hardif_neigh = batadv_hardif_neigh_get(neigh_node->if_incoming,
 266                                                neigh_node->addr);
 267         if (hardif_neigh) {
 268                 /* batadv_hardif_neigh_get() increases refcount too */
 269                 batadv_hardif_neigh_free_now(hardif_neigh);
 270                 batadv_hardif_neigh_free_now(hardif_neigh);
 271         }
 272
 273         if (bao->bat_neigh_free)
 274                 bao->bat_neigh_free(neigh_node);
 275
 276         batadv_hardif_free_ref_now(neigh_node->if_incoming);
 277
 278         kfree(neigh_node);
 279 }
 280
 281 /**
 282  * batadv_neigh_node_free_ref_now - decrement the neighbors refcounter
 283  *  and possibly free it (without rcu callback)
 284  * @neigh_node: neigh neighbor to free
 285  */
 286 static void
 287 batadv_neigh_node_free_ref_now(struct batadv_neigh_node *neigh_node)
 288 {
 289         if (atomic_dec_and_test(&neigh_node->refcount))
 290                 batadv_neigh_node_free_rcu(&neigh_node->rcu);
 291 }
 292
 293 /**
 294  * batadv_neigh_node_free_ref - decrement the neighbors refcounter
 295  *  and possibly free it
 296  * @neigh_node: neigh neighbor to free
 297  */
 298 void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node)
 299 {
 300         if (atomic_dec_and_test(&neigh_node->refcount))
 301                 call_rcu(&neigh_node->rcu, batadv_neigh_node_free_rcu);
 302 }
 303
 304 /**
 305  * batadv_orig_node_get_router - router to the originator depending on iface
 306  * @orig_node: the orig node for the router
 307  * @if_outgoing: the interface where the payload packet has been received or
 308  *  the OGM should be sent to
 309  *
 310  * Returns the neighbor which should be router for this orig_node/iface.
 311  *
 312  * The object is returned with refcounter increased by 1.
 313  */
 314 struct batadv_neigh_node *
 315 batadv_orig_router_get(struct batadv_orig_node *orig_node,
 316                        const struct batadv_hard_iface *if_outgoing)
 317 {
 318         struct batadv_orig_ifinfo *orig_ifinfo;
 319         struct batadv_neigh_node *router = NULL;
 320
 321         rcu_read_lock();
 322         hlist_for_each_entry_rcu(orig_ifinfo, &orig_node->ifinfo_list, list) {
 323                 if (orig_ifinfo->if_outgoing != if_outgoing)
 324                         continue;
 325
 326                 router = rcu_dereference(orig_ifinfo->router);
 327                 break;
 328         }
 329
 330         if (router && !atomic_inc_not_zero(&router->refcount))
 331                 router = NULL;
 332
 333         rcu_read_unlock();
 334         return router;
 335 }
 336
 337 /**
 338  * batadv_orig_ifinfo_get - find the ifinfo from an orig_node
 339  * @orig_node: the orig node to be queried
 340  * @if_outgoing: the interface for which the ifinfo should be acquired
 341  *
 342  * Returns the requested orig_ifinfo or NULL if not found.
 343  *
 344  * The object is returned with refcounter increased by 1.
 345  */
 346 struct batadv_orig_ifinfo *
 347 batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node,
 348                        struct batadv_hard_iface *if_outgoing)
 349 {
 350         struct batadv_orig_ifinfo *tmp, *orig_ifinfo = NULL;
 351
 352         rcu_read_lock();
 353         hlist_for_each_entry_rcu(tmp, &orig_node->ifinfo_list,
 354                                  list) {
 355                 if (tmp->if_outgoing != if_outgoing)
 356                         continue;
 357
 358                 if (!atomic_inc_not_zero(&tmp->refcount))
 359                         continue;
 360
 361                 orig_ifinfo = tmp;
 362                 break;
 363         }
 364         rcu_read_unlock();
 365
 366         return orig_ifinfo;
 367 }
 368
 369 /**
 370  * batadv_orig_ifinfo_new - search and possibly create an orig_ifinfo object
 371  * @orig_node: the orig node to be queried
 372  * @if_outgoing: the interface for which the ifinfo should be acquired
 373  *
 374  * Returns NULL in case of failure or the orig_ifinfo object for the if_outgoing
 375  * interface otherwise. The object is created and added to the list
 376  * if it does not exist.
 377  *
 378  * The object is returned with refcounter increased by 1.
 379  */
 380 struct batadv_orig_ifinfo *
 381 batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node,
 382                        struct batadv_hard_iface *if_outgoing)
 383 {
 384         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
 385         unsigned long reset_time;
 386
 387         spin_lock_bh(&orig_node->neigh_list_lock);
 388
 389         orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing);
 390         if (orig_ifinfo)
 391                 goto out;
 392
 393         orig_ifinfo = kzalloc(sizeof(*orig_ifinfo), GFP_ATOMIC);
 394         if (!orig_ifinfo)
 395                 goto out;
 396
 397         if (if_outgoing != BATADV_IF_DEFAULT &&
 398             !atomic_inc_not_zero(&if_outgoing->refcount)) {
 399                 kfree(orig_ifinfo);
 400                 orig_ifinfo = NULL;
 401                 goto out;
 402         }
 403
 404         reset_time = jiffies - 1;
 405         reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 406         orig_ifinfo->batman_seqno_reset = reset_time;
 407         orig_ifinfo->if_outgoing = if_outgoing;
 408         INIT_HLIST_NODE(&orig_ifinfo->list);
 409         atomic_set(&orig_ifinfo->refcount, 2);
 410         hlist_add_head_rcu(&orig_ifinfo->list,
 411                            &orig_node->ifinfo_list);
 412 out:
 413         spin_unlock_bh(&orig_node->neigh_list_lock);
 414         return orig_ifinfo;
 415 }
 416
 417 /**
 418  * batadv_neigh_ifinfo_get - find the ifinfo from an neigh_node
 419  * @neigh_node: the neigh node to be queried
 420  * @if_outgoing: the interface for which the ifinfo should be acquired
 421  *
 422  * The object is returned with refcounter increased by 1.
 423  *
 424  * Returns the requested neigh_ifinfo or NULL if not found
 425  */
 426 struct batadv_neigh_ifinfo *
 427 batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh,
 428                         struct batadv_hard_iface *if_outgoing)
 429 {
 430         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL,
 431                                    *tmp_neigh_ifinfo;
 432
 433         rcu_read_lock();
 434         hlist_for_each_entry_rcu(tmp_neigh_ifinfo, &neigh->ifinfo_list,
 435                                  list) {
 436                 if (tmp_neigh_ifinfo->if_outgoing != if_outgoing)
 437                         continue;
 438
 439                 if (!atomic_inc_not_zero(&tmp_neigh_ifinfo->refcount))
 440                         continue;
 441
 442                 neigh_ifinfo = tmp_neigh_ifinfo;
 443                 break;
 444         }
 445         rcu_read_unlock();
 446
 447         return neigh_ifinfo;
 448 }
 449
 450 /**
 451  * batadv_neigh_ifinfo_new - search and possibly create an neigh_ifinfo object
 452  * @neigh_node: the neigh node to be queried
 453  * @if_outgoing: the interface for which the ifinfo should be acquired
 454  *
 455  * Returns NULL in case of failure or the neigh_ifinfo object for the
 456  * if_outgoing interface otherwise. The object is created and added to the list
 457  * if it does not exist.
 458  *
 459  * The object is returned with refcounter increased by 1.
 460  */
 461 struct batadv_neigh_ifinfo *
 462 batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh,
 463                         struct batadv_hard_iface *if_outgoing)
 464 {
 465         struct batadv_neigh_ifinfo *neigh_ifinfo;
 466
 467         spin_lock_bh(&neigh->ifinfo_lock);
 468
 469         neigh_ifinfo = batadv_neigh_ifinfo_get(neigh, if_outgoing);
 470         if (neigh_ifinfo)
 471                 goto out;
 472
 473         neigh_ifinfo = kzalloc(sizeof(*neigh_ifinfo), GFP_ATOMIC);
 474         if (!neigh_ifinfo)
 475                 goto out;
 476
 477         if (if_outgoing && !atomic_inc_not_zero(&if_outgoing->refcount)) {
 478                 kfree(neigh_ifinfo);
 479                 neigh_ifinfo = NULL;
 480                 goto out;
 481         }
 482
 483         INIT_HLIST_NODE(&neigh_ifinfo->list);
 484         atomic_set(&neigh_ifinfo->refcount, 2);
 485         neigh_ifinfo->if_outgoing = if_outgoing;
 486
 487         hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list);
 488
 489 out:
 490         spin_unlock_bh(&neigh->ifinfo_lock);
 491
 492         return neigh_ifinfo;
 493 }
 494
 495 /**
 496  * batadv_neigh_node_get - retrieve a neighbour from the list
 497  * @orig_node: originator which the neighbour belongs to
 498  * @hard_iface: the interface where this neighbour is connected to
 499  * @addr: the address of the neighbour
 500  *
 501  * Looks for and possibly returns a neighbour belonging to this originator list
 502  * which is connected through the provided hard interface.
 503  * Returns NULL if the neighbour is not found.
 504  */
 505 static struct batadv_neigh_node *
 506 batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
 507                       const struct batadv_hard_iface *hard_iface,
 508                       const u8 *addr)
 509 {
 510         struct batadv_neigh_node *tmp_neigh_node, *res = NULL;
 511
 512         rcu_read_lock();
 513         hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) {
 514                 if (!batadv_compare_eth(tmp_neigh_node->addr, addr))
 515                         continue;
 516
 517                 if (tmp_neigh_node->if_incoming != hard_iface)
 518                         continue;
 519
 520                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 521                         continue;
 522
 523                 res = tmp_neigh_node;
 524                 break;
 525         }
 526         rcu_read_unlock();
 527
 528         return res;
 529 }
 530
 531 /**
 532  * batadv_hardif_neigh_create - create a hardif neighbour node
 533  * @hard_iface: the interface this neighbour is connected to
 534  * @neigh_addr: the interface address of the neighbour to retrieve
 535  *
 536  * Returns the hardif neighbour node if found or created or NULL otherwise.
 537  */
 538 static struct batadv_hardif_neigh_node *
 539 batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface,
 540                            const u8 *neigh_addr)
 541 {
 542         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 543         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
 544
 545         spin_lock_bh(&hard_iface->neigh_list_lock);
 546
 547         /* check if neighbor hasn't been added in the meantime */
 548         hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr);
 549         if (hardif_neigh)
 550                 goto out;
 551
 552         if (!atomic_inc_not_zero(&hard_iface->refcount))
 553                 goto out;
 554
 555         hardif_neigh = kzalloc(sizeof(*hardif_neigh), GFP_ATOMIC);
 556         if (!hardif_neigh) {
 557                 batadv_hardif_free_ref(hard_iface);
 558                 goto out;
 559         }
 560
 561         INIT_HLIST_NODE(&hardif_neigh->list);
 562         ether_addr_copy(hardif_neigh->addr, neigh_addr);
 563         hardif_neigh->if_incoming = hard_iface;
 564         hardif_neigh->last_seen = jiffies;
 565
 566         atomic_set(&hardif_neigh->refcount, 1);
 567
 568         if (bat_priv->bat_algo_ops->bat_hardif_neigh_init)
 569                 bat_priv->bat_algo_ops->bat_hardif_neigh_init(hardif_neigh);
 570
 571         hlist_add_head(&hardif_neigh->list, &hard_iface->neigh_list);
 572
 573 out:
 574         spin_unlock_bh(&hard_iface->neigh_list_lock);
 575         return hardif_neigh;
 576 }
 577
 578 /**
 579  * batadv_hardif_neigh_get_or_create - retrieve or create a hardif neighbour
 580  *  node
 581  * @hard_iface: the interface this neighbour is connected to
 582  * @neigh_addr: the interface address of the neighbour to retrieve
 583  *
 584  * Returns the hardif neighbour node if found or created or NULL otherwise.
 585  */
 586 static struct batadv_hardif_neigh_node *
 587 batadv_hardif_neigh_get_or_create(struct batadv_hard_iface *hard_iface,
 588                                   const u8 *neigh_addr)
 589 {
 590         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
 591
 592         /* first check without locking to avoid the overhead */
 593         hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr);
 594         if (hardif_neigh)
 595                 return hardif_neigh;
 596
 597         return batadv_hardif_neigh_create(hard_iface, neigh_addr);
 598 }
 599
 600 /**
 601  * batadv_hardif_neigh_get - retrieve a hardif neighbour from the list
 602  * @hard_iface: the interface where this neighbour is connected to
 603  * @neigh_addr: the address of the neighbour
 604  *
 605  * Looks for and possibly returns a neighbour belonging to this hard interface.
 606  * Returns NULL if the neighbour is not found.
 607  */
 608 struct batadv_hardif_neigh_node *
 609 batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface,
 610                         const u8 *neigh_addr)
 611 {
 612         struct batadv_hardif_neigh_node *tmp_hardif_neigh, *hardif_neigh = NULL;
 613
 614         rcu_read_lock();
 615         hlist_for_each_entry_rcu(tmp_hardif_neigh,
 616                                  &hard_iface->neigh_list, list) {
 617                 if (!batadv_compare_eth(tmp_hardif_neigh->addr, neigh_addr))
 618                         continue;
 619
 620                 if (!atomic_inc_not_zero(&tmp_hardif_neigh->refcount))
 621                         continue;
 622
 623                 hardif_neigh = tmp_hardif_neigh;
 624                 break;
 625         }
 626         rcu_read_unlock();
 627
 628         return hardif_neigh;
 629 }
 630
 631 /**
 632  * batadv_neigh_node_new - create and init a new neigh_node object
 633  * @orig_node: originator object representing the neighbour
 634  * @hard_iface: the interface where the neighbour is connected to
 635  * @neigh_addr: the mac address of the neighbour interface
 636  *
 637  * Allocates a new neigh_node object and initialises all the generic fields.
 638  * Returns the new object or NULL on failure.
 639  */
 640 struct batadv_neigh_node *
 641 batadv_neigh_node_new(struct batadv_orig_node *orig_node,
 642                       struct batadv_hard_iface *hard_iface,
 643                       const u8 *neigh_addr)
 644 {
 645         struct batadv_neigh_node *neigh_node;
 646         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
 647
 648         neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr);
 649         if (neigh_node)
 650                 goto out;
 651
 652         hardif_neigh = batadv_hardif_neigh_get_or_create(hard_iface,
 653                                                          neigh_addr);
 654         if (!hardif_neigh)
 655                 goto out;
 656
 657         neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
 658         if (!neigh_node)
 659                 goto out;
 660
 661         if (!atomic_inc_not_zero(&hard_iface->refcount)) {
 662                 kfree(neigh_node);
 663                 neigh_node = NULL;
 664                 goto out;
 665         }
 666
 667         INIT_HLIST_NODE(&neigh_node->list);
 668         INIT_HLIST_HEAD(&neigh_node->ifinfo_list);
 669         spin_lock_init(&neigh_node->ifinfo_lock);
 670
 671         ether_addr_copy(neigh_node->addr, neigh_addr);
 672         neigh_node->if_incoming = hard_iface;
 673         neigh_node->orig_node = orig_node;
 674
 675         /* extra reference for return */
 676         atomic_set(&neigh_node->refcount, 2);
 677
 678         spin_lock_bh(&orig_node->neigh_list_lock);
 679         hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
 680         spin_unlock_bh(&orig_node->neigh_list_lock);
 681
 682         /* increment unique neighbor refcount */
 683         atomic_inc(&hardif_neigh->refcount);
 684
 685         batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv,
 686                    "Creating new neighbor %pM for orig_node %pM on interface %s\n",
 687                    neigh_addr, orig_node->orig, hard_iface->net_dev->name);
 688
 689 out:
 690         if (hardif_neigh)
 691                 batadv_hardif_neigh_free_ref(hardif_neigh);
 692         return neigh_node;
 693 }
 694
 695 /**
 696  * batadv_hardif_neigh_seq_print_text - print the single hop neighbour list
 697  * @seq: neighbour table seq_file struct
 698  * @offset: not used
 699  *
 700  * Always returns 0.
 701  */
 702 int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset)
 703 {
 704         struct net_device *net_dev = (struct net_device *)seq->private;
 705         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 706         struct batadv_hard_iface *primary_if;
 707
 708         primary_if = batadv_seq_print_text_primary_if_get(seq);
 709         if (!primary_if)
 710                 return 0;
 711
 712         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
 713                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
 714                    primary_if->net_dev->dev_addr, net_dev->name,
 715                    bat_priv->bat_algo_ops->name);
 716
 717         batadv_hardif_free_ref(primary_if);
 718
 719         if (!bat_priv->bat_algo_ops->bat_neigh_print) {
 720                 seq_puts(seq,
 721                          "No printing function for this routing protocol\n");
 722                 return 0;
 723         }
 724
 725         bat_priv->bat_algo_ops->bat_neigh_print(bat_priv, seq);
 726         return 0;
 727 }
 728
 729 /**
 730  * batadv_orig_ifinfo_free_rcu - free the orig_ifinfo object
 731  * @rcu: rcu pointer of the orig_ifinfo object
 732  */
 733 static void batadv_orig_ifinfo_free_rcu(struct rcu_head *rcu)
 734 {
 735         struct batadv_orig_ifinfo *orig_ifinfo;
 736         struct batadv_neigh_node *router;
 737
 738         orig_ifinfo = container_of(rcu, struct batadv_orig_ifinfo, rcu);
 739
 740         if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 741                 batadv_hardif_free_ref_now(orig_ifinfo->if_outgoing);
 742
 743         /* this is the last reference to this object */
 744         router = rcu_dereference_protected(orig_ifinfo->router, true);
 745         if (router)
 746                 batadv_neigh_node_free_ref_now(router);
 747         kfree(orig_ifinfo);
 748 }
 749
 750 /**
 751  * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly free
 752  *  the orig_ifinfo (without rcu callback)
 753  * @orig_ifinfo: the orig_ifinfo object to release
 754  */
 755 static void
 756 batadv_orig_ifinfo_free_ref_now(struct batadv_orig_ifinfo *orig_ifinfo)
 757 {
 758         if (atomic_dec_and_test(&orig_ifinfo->refcount))
 759                 batadv_orig_ifinfo_free_rcu(&orig_ifinfo->rcu);
 760 }
 761
 762 /**
 763  * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly free
 764  *  the orig_ifinfo
 765  * @orig_ifinfo: the orig_ifinfo object to release
 766  */
 767 void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo)
 768 {
 769         if (atomic_dec_and_test(&orig_ifinfo->refcount))
 770                 call_rcu(&orig_ifinfo->rcu, batadv_orig_ifinfo_free_rcu);
 771 }
 772
 773 static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 774 {
 775         struct hlist_node *node_tmp;
 776         struct batadv_neigh_node *neigh_node;
 777         struct batadv_orig_node *orig_node;
 778         struct batadv_orig_ifinfo *orig_ifinfo;
 779
 780         orig_node = container_of(rcu, struct batadv_orig_node, rcu);
 781
 782         spin_lock_bh(&orig_node->neigh_list_lock);
 783
 784         /* for all neighbors towards this originator ... */
 785         hlist_for_each_entry_safe(neigh_node, node_tmp,
 786                                   &orig_node->neigh_list, list) {
 787                 hlist_del_rcu(&neigh_node->list);
 788                 batadv_neigh_node_free_ref_now(neigh_node);
 789         }
 790
 791         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 792                                   &orig_node->ifinfo_list, list) {
 793                 hlist_del_rcu(&orig_ifinfo->list);
 794                 batadv_orig_ifinfo_free_ref_now(orig_ifinfo);
 795         }
 796         spin_unlock_bh(&orig_node->neigh_list_lock);
 797
 798         batadv_mcast_purge_orig(orig_node);
 799
 800         /* Free nc_nodes */
 801         batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 802
 803         batadv_frag_purge_orig(orig_node, NULL);
 804
 805         if (orig_node->bat_priv->bat_algo_ops->bat_orig_free)
 806                 orig_node->bat_priv->bat_algo_ops->bat_orig_free(orig_node);
 807
 808         kfree(orig_node->tt_buff);
 809         kfree(orig_node);
 810 }
 811
 812 /**
 813  * batadv_orig_node_free_ref - decrement the orig node refcounter and possibly
 814  * schedule an rcu callback for freeing it
 815  * @orig_node: the orig node to free
 816  */
 817 void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
 818 {
 819         if (atomic_dec_and_test(&orig_node->refcount))
 820                 call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
 821 }
 822
 823 /**
 824  * batadv_orig_node_free_ref_now - decrement the orig node refcounter and
 825  * possibly free it (without rcu callback)
 826  * @orig_node: the orig node to free
 827  */
 828 void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node)
 829 {
 830         if (atomic_dec_and_test(&orig_node->refcount))
 831                 batadv_orig_node_free_rcu(&orig_node->rcu);
 832 }
 833
 834 void batadv_originator_free(struct batadv_priv *bat_priv)
 835 {
 836         struct batadv_hashtable *hash = bat_priv->orig_hash;
 837         struct hlist_node *node_tmp;
 838         struct hlist_head *head;
 839         spinlock_t *list_lock; /* spinlock to protect write access */
 840         struct batadv_orig_node *orig_node;
 841         u32 i;
 842
 843         if (!hash)
 844                 return;
 845
 846         cancel_delayed_work_sync(&bat_priv->orig_work);
 847
 848         bat_priv->orig_hash = NULL;
 849
 850         for (i = 0; i < hash->size; i++) {
 851                 head = &hash->table[i];
 852                 list_lock = &hash->list_locks[i];
 853
 854                 spin_lock_bh(list_lock);
 855                 hlist_for_each_entry_safe(orig_node, node_tmp,
 856                                           head, hash_entry) {
 857                         hlist_del_rcu(&orig_node->hash_entry);
 858                         batadv_orig_node_free_ref(orig_node);
 859                 }
 860                 spin_unlock_bh(list_lock);
 861         }
 862
 863         batadv_hash_destroy(hash);
 864 }
 865
 866 /**
 867  * batadv_orig_node_new - creates a new orig_node
 868  * @bat_priv: the bat priv with all the soft interface information
 869  * @addr: the mac address of the originator
 870  *
 871  * Creates a new originator object and initialise all the generic fields.
 872  * The new object is not added to the originator list.
 873  * Returns the newly created object or NULL on failure.
 874  */
 875 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
 876                                               const u8 *addr)
 877 {
 878         struct batadv_orig_node *orig_node;
 879         struct batadv_orig_node_vlan *vlan;
 880         unsigned long reset_time;
 881         int i;
 882
 883         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 884                    "Creating new originator: %pM\n", addr);
 885
 886         orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
 887         if (!orig_node)
 888                 return NULL;
 889
 890         INIT_HLIST_HEAD(&orig_node->neigh_list);
 891         INIT_HLIST_HEAD(&orig_node->vlan_list);
 892         INIT_HLIST_HEAD(&orig_node->ifinfo_list);
 893         spin_lock_init(&orig_node->bcast_seqno_lock);
 894         spin_lock_init(&orig_node->neigh_list_lock);
 895         spin_lock_init(&orig_node->tt_buff_lock);
 896         spin_lock_init(&orig_node->tt_lock);
 897         spin_lock_init(&orig_node->vlan_list_lock);
 898
 899         batadv_nc_init_orig(orig_node);
 900
 901         /* extra reference for return */
 902         atomic_set(&orig_node->refcount, 2);
 903
 904         orig_node->bat_priv = bat_priv;
 905         ether_addr_copy(orig_node->orig, addr);
 906         batadv_dat_init_orig_node_addr(orig_node);
 907         atomic_set(&orig_node->last_ttvn, 0);
 908         orig_node->tt_buff = NULL;
 909         orig_node->tt_buff_len = 0;
 910         orig_node->last_seen = jiffies;
 911         reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 912         orig_node->bcast_seqno_reset = reset_time;
 913
 914 #ifdef CONFIG_BATMAN_ADV_MCAST
 915         orig_node->mcast_flags = BATADV_NO_FLAGS;
 916         INIT_HLIST_NODE(&orig_node->mcast_want_all_unsnoopables_node);
 917         INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv4_node);
 918         INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv6_node);
 919         spin_lock_init(&orig_node->mcast_handler_lock);
 920 #endif
 921
 922         /* create a vlan object for the "untagged" LAN */
 923         vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);
 924         if (!vlan)
 925                 goto free_orig_node;
 926         /* batadv_orig_node_vlan_new() increases the refcounter.
 927          * Immediately release vlan since it is not needed anymore in this
 928          * context
 929          */
 930         batadv_orig_node_vlan_free_ref(vlan);
 931
 932         for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
 933                 INIT_HLIST_HEAD(&orig_node->fragments[i].head);
 934                 spin_lock_init(&orig_node->fragments[i].lock);
 935                 orig_node->fragments[i].size = 0;
 936         }
 937
 938         return orig_node;
 939 free_orig_node:
 940         kfree(orig_node);
 941         return NULL;
 942 }
 943
 944 /**
 945  * batadv_purge_neigh_ifinfo - purge obsolete ifinfo entries from neighbor
 946  * @bat_priv: the bat priv with all the soft interface information
 947  * @neigh: orig node which is to be checked
 948  */
 949 static void
 950 batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv,
 951                           struct batadv_neigh_node *neigh)
 952 {
 953         struct batadv_neigh_ifinfo *neigh_ifinfo;
 954         struct batadv_hard_iface *if_outgoing;
 955         struct hlist_node *node_tmp;
 956
 957         spin_lock_bh(&neigh->ifinfo_lock);
 958
 959         /* for all ifinfo objects for this neighinator */
 960         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
 961                                   &neigh->ifinfo_list, list) {
 962                 if_outgoing = neigh_ifinfo->if_outgoing;
 963
 964                 /* always keep the default interface */
 965                 if (if_outgoing == BATADV_IF_DEFAULT)
 966                         continue;
 967
 968                 /* don't purge if the interface is not (going) down */
 969                 if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
 970                     (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
 971                     (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
 972                         continue;
 973
 974                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 975                            "neighbor/ifinfo purge: neighbor %pM, iface: %s\n",
 976                            neigh->addr, if_outgoing->net_dev->name);
 977
 978                 hlist_del_rcu(&neigh_ifinfo->list);
 979                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
 980         }
 981
 982         spin_unlock_bh(&neigh->ifinfo_lock);
 983 }
 984
 985 /**
 986  * batadv_purge_orig_ifinfo - purge obsolete ifinfo entries from originator
 987  * @bat_priv: the bat priv with all the soft interface information
 988  * @orig_node: orig node which is to be checked
 989  *
 990  * Returns true if any ifinfo entry was purged, false otherwise.
 991  */
 992 static bool
 993 batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv,
 994                          struct batadv_orig_node *orig_node)
 995 {
 996         struct batadv_orig_ifinfo *orig_ifinfo;
 997         struct batadv_hard_iface *if_outgoing;
 998         struct hlist_node *node_tmp;
 999         bool ifinfo_purged = false;
1000
1001         spin_lock_bh(&orig_node->neigh_list_lock);
1002
1003         /* for all ifinfo objects for this originator */
1004         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
1005                                   &orig_node->ifinfo_list, list) {
1006                 if_outgoing = orig_ifinfo->if_outgoing;
1007
1008                 /* always keep the default interface */
1009                 if (if_outgoing == BATADV_IF_DEFAULT)
1010                         continue;
1011
1012                 /* don't purge if the interface is not (going) down */
1013                 if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
1014                     (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
1015                     (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
1016                         continue;
1017
1018                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1019                            "router/ifinfo purge: originator %pM, iface: %s\n",
1020                            orig_node->orig, if_outgoing->net_dev->name);
1021
1022                 ifinfo_purged = true;
1023
1024                 hlist_del_rcu(&orig_ifinfo->list);
1025                 batadv_orig_ifinfo_free_ref(orig_ifinfo);
1026                 if (orig_node->last_bonding_candidate == orig_ifinfo) {
1027                         orig_node->last_bonding_candidate = NULL;
1028                         batadv_orig_ifinfo_free_ref(orig_ifinfo);
1029                 }
1030         }
1031
1032         spin_unlock_bh(&orig_node->neigh_list_lock);
1033
1034         return ifinfo_purged;
1035 }
1036
1037 /**
1038  * batadv_purge_orig_neighbors - purges neighbors from originator
1039  * @bat_priv: the bat priv with all the soft interface information
1040  * @orig_node: orig node which is to be checked
1041  *
1042  * Returns true if any neighbor was purged, false otherwise
1043  */
1044 static bool
1045 batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
1046                             struct batadv_orig_node *orig_node)
1047 {
1048         struct hlist_node *node_tmp;
1049         struct batadv_neigh_node *neigh_node;
1050         bool neigh_purged = false;
1051         unsigned long last_seen;
1052         struct batadv_hard_iface *if_incoming;
1053
1054         spin_lock_bh(&orig_node->neigh_list_lock);
1055
1056         /* for all neighbors towards this originator ... */
1057         hlist_for_each_entry_safe(neigh_node, node_tmp,
1058                                   &orig_node->neigh_list, list) {
1059                 last_seen = neigh_node->last_seen;
1060                 if_incoming = neigh_node->if_incoming;
1061
1062                 if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) ||
1063                     (if_incoming->if_status == BATADV_IF_INACTIVE) ||
1064                     (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
1065                     (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) {
1066                         if ((if_incoming->if_status == BATADV_IF_INACTIVE) ||
1067                             (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
1068                             (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED))
1069                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1070                                            "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
1071                                            orig_node->orig, neigh_node->addr,
1072                                            if_incoming->net_dev->name);
1073                         else
1074                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1075                                            "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
1076                                            orig_node->orig, neigh_node->addr,
1077                                            jiffies_to_msecs(last_seen));
1078
1079                         neigh_purged = true;
1080
1081                         hlist_del_rcu(&neigh_node->list);
1082                         batadv_neigh_node_free_ref(neigh_node);
1083                 } else {
1084                         /* only necessary if not the whole neighbor is to be
1085                          * deleted, but some interface has been removed.
1086                          */
1087                         batadv_purge_neigh_ifinfo(bat_priv, neigh_node);
1088                 }
1089         }
1090
1091         spin_unlock_bh(&orig_node->neigh_list_lock);
1092         return neigh_purged;
1093 }
1094
1095 /**
1096  * batadv_find_best_neighbor - finds the best neighbor after purging
1097  * @bat_priv: the bat priv with all the soft interface information
1098  * @orig_node: orig node which is to be checked
1099  * @if_outgoing: the interface for which the metric should be compared
1100  *
1101  * Returns the current best neighbor, with refcount increased.
1102  */
1103 static struct batadv_neigh_node *
1104 batadv_find_best_neighbor(struct batadv_priv *bat_priv,
1105                           struct batadv_orig_node *orig_node,
1106                           struct batadv_hard_iface *if_outgoing)
1107 {
1108         struct batadv_neigh_node *best = NULL, *neigh;
1109         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1110
1111         rcu_read_lock();
1112         hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) {
1113                 if (best && (bao->bat_neigh_cmp(neigh, if_outgoing,
1114                                                 best, if_outgoing) <= 0))
1115                         continue;
1116
1117                 if (!atomic_inc_not_zero(&neigh->refcount))
1118                         continue;
1119
1120                 if (best)
1121                         batadv_neigh_node_free_ref(best);
1122
1123                 best = neigh;
1124         }
1125         rcu_read_unlock();
1126
1127         return best;
1128 }
1129
1130 /**
1131  * batadv_purge_orig_node - purges obsolete information from an orig_node
1132  * @bat_priv: the bat priv with all the soft interface information
1133  * @orig_node: orig node which is to be checked
1134  *
1135  * This function checks if the orig_node or substructures of it have become
1136  * obsolete, and purges this information if that's the case.
1137  *
1138  * Returns true if the orig_node is to be removed, false otherwise.
1139  */
1140 static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
1141                                    struct batadv_orig_node *orig_node)
1142 {
1143         struct batadv_neigh_node *best_neigh_node;
1144         struct batadv_hard_iface *hard_iface;
1145         bool changed_ifinfo, changed_neigh;
1146
1147         if (batadv_has_timed_out(orig_node->last_seen,
1148                                  2 * BATADV_PURGE_TIMEOUT)) {
1149                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1150                            "Originator timeout: originator %pM, last_seen %u\n",
1151                            orig_node->orig,
1152                            jiffies_to_msecs(orig_node->last_seen));
1153                 return true;
1154         }
1155         changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node);
1156         changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node);
1157
1158         if (!changed_ifinfo && !changed_neigh)
1159                 return false;
1160
1161         /* first for NULL ... */
1162         best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node,
1163                                                     BATADV_IF_DEFAULT);
1164         batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT,
1165                             best_neigh_node);
1166         if (best_neigh_node)
1167                 batadv_neigh_node_free_ref(best_neigh_node);
1168
1169         /* ... then for all other interfaces. */
1170         rcu_read_lock();
1171         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1172                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1173                         continue;
1174
1175                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1176                         continue;
1177
1178                 best_neigh_node = batadv_find_best_neighbor(bat_priv,
1179                                                             orig_node,
1180                                                             hard_iface);
1181                 batadv_update_route(bat_priv, orig_node, hard_iface,
1182                                     best_neigh_node);
1183                 if (best_neigh_node)
1184                         batadv_neigh_node_free_ref(best_neigh_node);
1185         }
1186         rcu_read_unlock();
1187
1188         return false;
1189 }
1190
1191 static void _batadv_purge_orig(struct batadv_priv *bat_priv)
1192 {
1193         struct batadv_hashtable *hash = bat_priv->orig_hash;
1194         struct hlist_node *node_tmp;
1195         struct hlist_head *head;
1196         spinlock_t *list_lock; /* spinlock to protect write access */
1197         struct batadv_orig_node *orig_node;
1198         u32 i;
1199
1200         if (!hash)
1201                 return;
1202
1203         /* for all origins... */
1204         for (i = 0; i < hash->size; i++) {
1205                 head = &hash->table[i];
1206                 list_lock = &hash->list_locks[i];
1207
1208                 spin_lock_bh(list_lock);
1209                 hlist_for_each_entry_safe(orig_node, node_tmp,
1210                                           head, hash_entry) {
1211                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
1212                                 batadv_gw_node_delete(bat_priv, orig_node);
1213                                 hlist_del_rcu(&orig_node->hash_entry);
1214                                 batadv_tt_global_del_orig(orig_node->bat_priv,
1215                                                           orig_node, -1,
1216                                                           "originator timed out");
1217                                 batadv_orig_node_free_ref(orig_node);
1218                                 continue;
1219                         }
1220
1221                         batadv_frag_purge_orig(orig_node,
1222                                                batadv_frag_check_entry);
1223                 }
1224                 spin_unlock_bh(list_lock);
1225         }
1226
1227         batadv_gw_election(bat_priv);
1228 }
1229
1230 static void batadv_purge_orig(struct work_struct *work)
1231 {
1232         struct delayed_work *delayed_work;
1233         struct batadv_priv *bat_priv;
1234
1235         delayed_work = container_of(work, struct delayed_work, work);
1236         bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
1237         _batadv_purge_orig(bat_priv);
1238         queue_delayed_work(batadv_event_workqueue,
1239                            &bat_priv->orig_work,
1240                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
1241 }
1242
1243 void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
1244 {
1245         _batadv_purge_orig(bat_priv);
1246 }
1247
1248 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
1249 {
1250         struct net_device *net_dev = (struct net_device *)seq->private;
1251         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1252         struct batadv_hard_iface *primary_if;
1253
1254         primary_if = batadv_seq_print_text_primary_if_get(seq);
1255         if (!primary_if)
1256                 return 0;
1257
1258         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
1259                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
1260                    primary_if->net_dev->dev_addr, net_dev->name,
1261                    bat_priv->bat_algo_ops->name);
1262
1263         batadv_hardif_free_ref(primary_if);
1264
1265         if (!bat_priv->bat_algo_ops->bat_orig_print) {
1266                 seq_puts(seq,
1267                          "No printing function for this routing protocol\n");
1268                 return 0;
1269         }
1270
1271         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq,
1272                                                BATADV_IF_DEFAULT);
1273
1274         return 0;
1275 }
1276
1277 /**
1278  * batadv_orig_hardif_seq_print_text - writes originator infos for a specific
1279  *  outgoing interface
1280  * @seq: debugfs table seq_file struct
1281  * @offset: not used
1282  *
1283  * Returns 0
1284  */
1285 int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset)
1286 {
1287         struct net_device *net_dev = (struct net_device *)seq->private;
1288         struct batadv_hard_iface *hard_iface;
1289         struct batadv_priv *bat_priv;
1290
1291         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1292
1293         if (!hard_iface || !hard_iface->soft_iface) {
1294                 seq_puts(seq, "Interface not known to B.A.T.M.A.N.\n");
1295                 goto out;
1296         }
1297
1298         bat_priv = netdev_priv(hard_iface->soft_iface);
1299         if (!bat_priv->bat_algo_ops->bat_orig_print) {
1300                 seq_puts(seq,
1301                          "No printing function for this routing protocol\n");
1302                 goto out;
1303         }
1304
1305         if (hard_iface->if_status != BATADV_IF_ACTIVE) {
1306                 seq_puts(seq, "Interface not active\n");
1307                 goto out;
1308         }
1309
1310         seq_printf(seq, "[B.A.T.M.A.N. adv %s, IF/MAC: %s/%pM (%s %s)]\n",
1311                    BATADV_SOURCE_VERSION, hard_iface->net_dev->name,
1312                    hard_iface->net_dev->dev_addr,
1313                    hard_iface->soft_iface->name, bat_priv->bat_algo_ops->name);
1314
1315         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, hard_iface);
1316
1317 out:
1318         if (hard_iface)
1319                 batadv_hardif_free_ref(hard_iface);
1320         return 0;
1321 }
1322
1323 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
1324                             int max_if_num)
1325 {
1326         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
1327         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1328         struct batadv_hashtable *hash = bat_priv->orig_hash;
1329         struct hlist_head *head;
1330         struct batadv_orig_node *orig_node;
1331         u32 i;
1332         int ret;
1333
1334         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1335          * if_num
1336          */
1337         for (i = 0; i < hash->size; i++) {
1338                 head = &hash->table[i];
1339
1340                 rcu_read_lock();
1341                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1342                         ret = 0;
1343                         if (bao->bat_orig_add_if)
1344                                 ret = bao->bat_orig_add_if(orig_node,
1345                                                            max_if_num);
1346                         if (ret == -ENOMEM)
1347                                 goto err;
1348                 }
1349                 rcu_read_unlock();
1350         }
1351
1352         return 0;
1353
1354 err:
1355         rcu_read_unlock();
1356         return -ENOMEM;
1357 }
1358
1359 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
1360                             int max_if_num)
1361 {
1362         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
1363         struct batadv_hashtable *hash = bat_priv->orig_hash;
1364         struct hlist_head *head;
1365         struct batadv_hard_iface *hard_iface_tmp;
1366         struct batadv_orig_node *orig_node;
1367         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1368         u32 i;
1369         int ret;
1370
1371         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1372          * if_num
1373          */
1374         for (i = 0; i < hash->size; i++) {
1375                 head = &hash->table[i];
1376
1377                 rcu_read_lock();
1378                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1379                         ret = 0;
1380                         if (bao->bat_orig_del_if)
1381                                 ret = bao->bat_orig_del_if(orig_node,
1382                                                            max_if_num,
1383                                                            hard_iface->if_num);
1384                         if (ret == -ENOMEM)
1385                                 goto err;
1386                 }
1387                 rcu_read_unlock();
1388         }
1389
1390         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
1391         rcu_read_lock();
1392         list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) {
1393                 if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE)
1394                         continue;
1395
1396                 if (hard_iface == hard_iface_tmp)
1397                         continue;
1398
1399                 if (hard_iface->soft_iface != hard_iface_tmp->soft_iface)
1400                         continue;
1401
1402                 if (hard_iface_tmp->if_num > hard_iface->if_num)
1403                         hard_iface_tmp->if_num--;
1404         }
1405         rcu_read_unlock();
1406
1407         hard_iface->if_num = -1;
1408         return 0;
1409
1410 err:
1411         rcu_read_unlock();
1412         return -ENOMEM;
1413 }