net/batman-adv/originator.c

   1 /* Copyright (C) 2009-2014 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 "main.h"
  19 #include "distributed-arp-table.h"
  20 #include "originator.h"
  21 #include "hash.h"
  22 #include "translation-table.h"
  23 #include "routing.h"
  24 #include "gateway_client.h"
  25 #include "hard-interface.h"
  26 #include "soft-interface.h"
  27 #include "bridge_loop_avoidance.h"
  28 #include "network-coding.h"
  29 #include "fragmentation.h"
  30
  31 /* hash class keys */
  32 static struct lock_class_key batadv_orig_hash_lock_class_key;
  33
  34 static void batadv_purge_orig(struct work_struct *work);
  35
  36 /* returns 1 if they are the same originator */
  37 int batadv_compare_orig(const struct hlist_node *node, const void *data2)
  38 {
  39         const void *data1 = container_of(node, struct batadv_orig_node,
  40                                          hash_entry);
  41
  42         return batadv_compare_eth(data1, data2);
  43 }
  44
  45 /**
  46  * batadv_orig_node_vlan_get - get an orig_node_vlan object
  47  * @orig_node: the originator serving the VLAN
  48  * @vid: the VLAN identifier
  49  *
  50  * Returns the vlan object identified by vid and belonging to orig_node or NULL
  51  * if it does not exist.
  52  */
  53 struct batadv_orig_node_vlan *
  54 batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
  55                           unsigned short vid)
  56 {
  57         struct batadv_orig_node_vlan *vlan = NULL, *tmp;
  58
  59         rcu_read_lock();
  60         list_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) {
  61                 if (tmp->vid != vid)
  62                         continue;
  63
  64                 if (!atomic_inc_not_zero(&tmp->refcount))
  65                         continue;
  66
  67                 vlan = tmp;
  68
  69                 break;
  70         }
  71         rcu_read_unlock();
  72
  73         return vlan;
  74 }
  75
  76 /**
  77  * batadv_orig_node_vlan_new - search and possibly create an orig_node_vlan
  78  *  object
  79  * @orig_node: the originator serving the VLAN
  80  * @vid: the VLAN identifier
  81  *
  82  * Returns NULL in case of failure or the vlan object identified by vid and
  83  * belonging to orig_node otherwise. The object is created and added to the list
  84  * if it does not exist.
  85  *
  86  * The object is returned with refcounter increased by 1.
  87  */
  88 struct batadv_orig_node_vlan *
  89 batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
  90                           unsigned short vid)
  91 {
  92         struct batadv_orig_node_vlan *vlan;
  93
  94         spin_lock_bh(&orig_node->vlan_list_lock);
  95
  96         /* first look if an object for this vid already exists */
  97         vlan = batadv_orig_node_vlan_get(orig_node, vid);
  98         if (vlan)
  99                 goto out;
 100
 101         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 102         if (!vlan)
 103                 goto out;
 104
 105         atomic_set(&vlan->refcount, 2);
 106         vlan->vid = vid;
 107
 108         list_add_rcu(&vlan->list, &orig_node->vlan_list);
 109
 110 out:
 111         spin_unlock_bh(&orig_node->vlan_list_lock);
 112
 113         return vlan;
 114 }
 115
 116 /**
 117  * batadv_orig_node_vlan_free_ref - decrement the refcounter and possibly free
 118  *  the originator-vlan object
 119  * @orig_vlan: the originator-vlan object to release
 120  */
 121 void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan)
 122 {
 123         if (atomic_dec_and_test(&orig_vlan->refcount))
 124                 kfree_rcu(orig_vlan, rcu);
 125 }
 126
 127 int batadv_originator_init(struct batadv_priv *bat_priv)
 128 {
 129         if (bat_priv->orig_hash)
 130                 return 0;
 131
 132         bat_priv->orig_hash = batadv_hash_new(1024);
 133
 134         if (!bat_priv->orig_hash)
 135                 goto err;
 136
 137         batadv_hash_set_lock_class(bat_priv->orig_hash,
 138                                    &batadv_orig_hash_lock_class_key);
 139
 140         INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig);
 141         queue_delayed_work(batadv_event_workqueue,
 142                            &bat_priv->orig_work,
 143                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 144
 145         return 0;
 146
 147 err:
 148         return -ENOMEM;
 149 }
 150
 151 /**
 152  * batadv_neigh_ifinfo_free_rcu - free the neigh_ifinfo object
 153  * @rcu: rcu pointer of the neigh_ifinfo object
 154  */
 155 static void batadv_neigh_ifinfo_free_rcu(struct rcu_head *rcu)
 156 {
 157         struct batadv_neigh_ifinfo *neigh_ifinfo;
 158
 159         neigh_ifinfo = container_of(rcu, struct batadv_neigh_ifinfo, rcu);
 160
 161         if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 162                 batadv_hardif_free_ref_now(neigh_ifinfo->if_outgoing);
 163
 164         kfree(neigh_ifinfo);
 165 }
 166
 167 /**
 168  * batadv_neigh_ifinfo_free_now - decrement the refcounter and possibly free
 169  *  the neigh_ifinfo (without rcu callback)
 170  * @neigh_ifinfo: the neigh_ifinfo object to release
 171  */
 172 static void
 173 batadv_neigh_ifinfo_free_ref_now(struct batadv_neigh_ifinfo *neigh_ifinfo)
 174 {
 175         if (atomic_dec_and_test(&neigh_ifinfo->refcount))
 176                 batadv_neigh_ifinfo_free_rcu(&neigh_ifinfo->rcu);
 177 }
 178
 179 /**
 180  * batadv_neigh_ifinfo_free_ref - decrement the refcounter and possibly free
 181  *  the neigh_ifinfo
 182  * @neigh_ifinfo: the neigh_ifinfo object to release
 183  */
 184 void batadv_neigh_ifinfo_free_ref(struct batadv_neigh_ifinfo *neigh_ifinfo)
 185 {
 186         if (atomic_dec_and_test(&neigh_ifinfo->refcount))
 187                 call_rcu(&neigh_ifinfo->rcu, batadv_neigh_ifinfo_free_rcu);
 188 }
 189
 190 /**
 191  * batadv_neigh_node_free_rcu - free the neigh_node
 192  * @rcu: rcu pointer of the neigh_node
 193  */
 194 static void batadv_neigh_node_free_rcu(struct rcu_head *rcu)
 195 {
 196         struct hlist_node *node_tmp;
 197         struct batadv_neigh_node *neigh_node;
 198         struct batadv_neigh_ifinfo *neigh_ifinfo;
 199
 200         neigh_node = container_of(rcu, struct batadv_neigh_node, rcu);
 201
 202         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
 203                                   &neigh_node->ifinfo_list, list) {
 204                 batadv_neigh_ifinfo_free_ref_now(neigh_ifinfo);
 205         }
 206         batadv_hardif_free_ref_now(neigh_node->if_incoming);
 207
 208         kfree(neigh_node);
 209 }
 210
 211 /**
 212  * batadv_neigh_node_free_ref_now - decrement the neighbors refcounter
 213  *  and possibly free it (without rcu callback)
 214  * @neigh_node: neigh neighbor to free
 215  */
 216 static void
 217 batadv_neigh_node_free_ref_now(struct batadv_neigh_node *neigh_node)
 218 {
 219         if (atomic_dec_and_test(&neigh_node->refcount))
 220                 batadv_neigh_node_free_rcu(&neigh_node->rcu);
 221 }
 222
 223 /**
 224  * batadv_neigh_node_free_ref - decrement the neighbors refcounter
 225  *  and possibly free it
 226  * @neigh_node: neigh neighbor to free
 227  */
 228 void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node)
 229 {
 230         if (atomic_dec_and_test(&neigh_node->refcount))
 231                 call_rcu(&neigh_node->rcu, batadv_neigh_node_free_rcu);
 232 }
 233
 234 /**
 235  * batadv_orig_node_get_router - router to the originator depending on iface
 236  * @orig_node: the orig node for the router
 237  * @if_outgoing: the interface where the payload packet has been received or
 238  *  the OGM should be sent to
 239  *
 240  * Returns the neighbor which should be router for this orig_node/iface.
 241  *
 242  * The object is returned with refcounter increased by 1.
 243  */
 244 struct batadv_neigh_node *
 245 batadv_orig_router_get(struct batadv_orig_node *orig_node,
 246                        const struct batadv_hard_iface *if_outgoing)
 247 {
 248         struct batadv_orig_ifinfo *orig_ifinfo;
 249         struct batadv_neigh_node *router = NULL;
 250
 251         rcu_read_lock();
 252         hlist_for_each_entry_rcu(orig_ifinfo, &orig_node->ifinfo_list, list) {
 253                 if (orig_ifinfo->if_outgoing != if_outgoing)
 254                         continue;
 255
 256                 router = rcu_dereference(orig_ifinfo->router);
 257                 break;
 258         }
 259
 260         if (router && !atomic_inc_not_zero(&router->refcount))
 261                 router = NULL;
 262
 263         rcu_read_unlock();
 264         return router;
 265 }
 266
 267 /**
 268  * batadv_orig_ifinfo_get - find the ifinfo from an orig_node
 269  * @orig_node: the orig node to be queried
 270  * @if_outgoing: the interface for which the ifinfo should be acquired
 271  *
 272  * Returns the requested orig_ifinfo or NULL if not found.
 273  *
 274  * The object is returned with refcounter increased by 1.
 275  */
 276 struct batadv_orig_ifinfo *
 277 batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node,
 278                        struct batadv_hard_iface *if_outgoing)
 279 {
 280         struct batadv_orig_ifinfo *tmp, *orig_ifinfo = NULL;
 281
 282         rcu_read_lock();
 283         hlist_for_each_entry_rcu(tmp, &orig_node->ifinfo_list,
 284                                  list) {
 285                 if (tmp->if_outgoing != if_outgoing)
 286                         continue;
 287
 288                 if (!atomic_inc_not_zero(&tmp->refcount))
 289                         continue;
 290
 291                 orig_ifinfo = tmp;
 292                 break;
 293         }
 294         rcu_read_unlock();
 295
 296         return orig_ifinfo;
 297 }
 298
 299 /**
 300  * batadv_orig_ifinfo_new - search and possibly create an orig_ifinfo object
 301  * @orig_node: the orig node to be queried
 302  * @if_outgoing: the interface for which the ifinfo should be acquired
 303  *
 304  * Returns NULL in case of failure or the orig_ifinfo object for the if_outgoing
 305  * interface otherwise. The object is created and added to the list
 306  * if it does not exist.
 307  *
 308  * The object is returned with refcounter increased by 1.
 309  */
 310 struct batadv_orig_ifinfo *
 311 batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node,
 312                        struct batadv_hard_iface *if_outgoing)
 313 {
 314         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
 315         unsigned long reset_time;
 316
 317         spin_lock_bh(&orig_node->neigh_list_lock);
 318
 319         orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing);
 320         if (orig_ifinfo)
 321                 goto out;
 322
 323         orig_ifinfo = kzalloc(sizeof(*orig_ifinfo), GFP_ATOMIC);
 324         if (!orig_ifinfo)
 325                 goto out;
 326
 327         if (if_outgoing != BATADV_IF_DEFAULT &&
 328             !atomic_inc_not_zero(&if_outgoing->refcount)) {
 329                 kfree(orig_ifinfo);
 330                 orig_ifinfo = NULL;
 331                 goto out;
 332         }
 333
 334         reset_time = jiffies - 1;
 335         reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 336         orig_ifinfo->batman_seqno_reset = reset_time;
 337         orig_ifinfo->if_outgoing = if_outgoing;
 338         INIT_HLIST_NODE(&orig_ifinfo->list);
 339         atomic_set(&orig_ifinfo->refcount, 2);
 340         hlist_add_head_rcu(&orig_ifinfo->list,
 341                            &orig_node->ifinfo_list);
 342 out:
 343         spin_unlock_bh(&orig_node->neigh_list_lock);
 344         return orig_ifinfo;
 345 }
 346
 347 /**
 348  * batadv_neigh_ifinfo_get - find the ifinfo from an neigh_node
 349  * @neigh_node: the neigh node to be queried
 350  * @if_outgoing: the interface for which the ifinfo should be acquired
 351  *
 352  * The object is returned with refcounter increased by 1.
 353  *
 354  * Returns the requested neigh_ifinfo or NULL if not found
 355  */
 356 struct batadv_neigh_ifinfo *
 357 batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh,
 358                         struct batadv_hard_iface *if_outgoing)
 359 {
 360         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL,
 361                                    *tmp_neigh_ifinfo;
 362
 363         rcu_read_lock();
 364         hlist_for_each_entry_rcu(tmp_neigh_ifinfo, &neigh->ifinfo_list,
 365                                  list) {
 366                 if (tmp_neigh_ifinfo->if_outgoing != if_outgoing)
 367                         continue;
 368
 369                 if (!atomic_inc_not_zero(&tmp_neigh_ifinfo->refcount))
 370                         continue;
 371
 372                 neigh_ifinfo = tmp_neigh_ifinfo;
 373                 break;
 374         }
 375         rcu_read_unlock();
 376
 377         return neigh_ifinfo;
 378 }
 379
 380 /**
 381  * batadv_neigh_ifinfo_new - search and possibly create an neigh_ifinfo object
 382  * @neigh_node: the neigh node to be queried
 383  * @if_outgoing: the interface for which the ifinfo should be acquired
 384  *
 385  * Returns NULL in case of failure or the neigh_ifinfo object for the
 386  * if_outgoing interface otherwise. The object is created and added to the list
 387  * if it does not exist.
 388  *
 389  * The object is returned with refcounter increased by 1.
 390  */
 391 struct batadv_neigh_ifinfo *
 392 batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh,
 393                         struct batadv_hard_iface *if_outgoing)
 394 {
 395         struct batadv_neigh_ifinfo *neigh_ifinfo;
 396
 397         spin_lock_bh(&neigh->ifinfo_lock);
 398
 399         neigh_ifinfo = batadv_neigh_ifinfo_get(neigh, if_outgoing);
 400         if (neigh_ifinfo)
 401                 goto out;
 402
 403         neigh_ifinfo = kzalloc(sizeof(*neigh_ifinfo), GFP_ATOMIC);
 404         if (!neigh_ifinfo)
 405                 goto out;
 406
 407         if (if_outgoing && !atomic_inc_not_zero(&if_outgoing->refcount)) {
 408                 kfree(neigh_ifinfo);
 409                 neigh_ifinfo = NULL;
 410                 goto out;
 411         }
 412
 413         INIT_HLIST_NODE(&neigh_ifinfo->list);
 414         atomic_set(&neigh_ifinfo->refcount, 2);
 415         neigh_ifinfo->if_outgoing = if_outgoing;
 416
 417         hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list);
 418
 419 out:
 420         spin_unlock_bh(&neigh->ifinfo_lock);
 421
 422         return neigh_ifinfo;
 423 }
 424
 425 /**
 426  * batadv_neigh_node_new - create and init a new neigh_node object
 427  * @hard_iface: the interface where the neighbour is connected to
 428  * @neigh_addr: the mac address of the neighbour interface
 429  * @orig_node: originator object representing the neighbour
 430  *
 431  * Allocates a new neigh_node object and initialises all the generic fields.
 432  * Returns the new object or NULL on failure.
 433  */
 434 struct batadv_neigh_node *
 435 batadv_neigh_node_new(struct batadv_hard_iface *hard_iface,
 436                       const uint8_t *neigh_addr,
 437                       struct batadv_orig_node *orig_node)
 438 {
 439         struct batadv_neigh_node *neigh_node;
 440
 441         neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
 442         if (!neigh_node)
 443                 goto out;
 444
 445         INIT_HLIST_NODE(&neigh_node->list);
 446         INIT_HLIST_HEAD(&neigh_node->ifinfo_list);
 447         spin_lock_init(&neigh_node->ifinfo_lock);
 448
 449         memcpy(neigh_node->addr, neigh_addr, ETH_ALEN);
 450         neigh_node->if_incoming = hard_iface;
 451         neigh_node->orig_node = orig_node;
 452
 453         /* extra reference for return */
 454         atomic_set(&neigh_node->refcount, 2);
 455
 456 out:
 457         return neigh_node;
 458 }
 459
 460 /**
 461  * batadv_neigh_node_get - retrieve a neighbour from the list
 462  * @orig_node: originator which the neighbour belongs to
 463  * @hard_iface: the interface where this neighbour is connected to
 464  * @addr: the address of the neighbour
 465  *
 466  * Looks for and possibly returns a neighbour belonging to this originator list
 467  * which is connected through the provided hard interface.
 468  * Returns NULL if the neighbour is not found.
 469  */
 470 struct batadv_neigh_node *
 471 batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
 472                       const struct batadv_hard_iface *hard_iface,
 473                       const uint8_t *addr)
 474 {
 475         struct batadv_neigh_node *tmp_neigh_node, *res = NULL;
 476
 477         rcu_read_lock();
 478         hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) {
 479                 if (!batadv_compare_eth(tmp_neigh_node->addr, addr))
 480                         continue;
 481
 482                 if (tmp_neigh_node->if_incoming != hard_iface)
 483                         continue;
 484
 485                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 486                         continue;
 487
 488                 res = tmp_neigh_node;
 489                 break;
 490         }
 491         rcu_read_unlock();
 492
 493         return res;
 494 }
 495
 496 /**
 497  * batadv_orig_ifinfo_free_rcu - free the orig_ifinfo object
 498  * @rcu: rcu pointer of the orig_ifinfo object
 499  */
 500 static void batadv_orig_ifinfo_free_rcu(struct rcu_head *rcu)
 501 {
 502         struct batadv_orig_ifinfo *orig_ifinfo;
 503
 504         orig_ifinfo = container_of(rcu, struct batadv_orig_ifinfo, rcu);
 505
 506         if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 507                 batadv_hardif_free_ref_now(orig_ifinfo->if_outgoing);
 508
 509         kfree(orig_ifinfo);
 510 }
 511
 512 /**
 513  * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly free
 514  *  the orig_ifinfo (without rcu callback)
 515  * @orig_ifinfo: the orig_ifinfo object to release
 516  */
 517 static void
 518 batadv_orig_ifinfo_free_ref_now(struct batadv_orig_ifinfo *orig_ifinfo)
 519 {
 520         if (atomic_dec_and_test(&orig_ifinfo->refcount))
 521                 batadv_orig_ifinfo_free_rcu(&orig_ifinfo->rcu);
 522 }
 523
 524 /**
 525  * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly free
 526  *  the orig_ifinfo
 527  * @orig_ifinfo: the orig_ifinfo object to release
 528  */
 529 void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo)
 530 {
 531         if (atomic_dec_and_test(&orig_ifinfo->refcount))
 532                 call_rcu(&orig_ifinfo->rcu, batadv_orig_ifinfo_free_rcu);
 533 }
 534
 535 static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 536 {
 537         struct hlist_node *node_tmp;
 538         struct batadv_neigh_node *neigh_node;
 539         struct batadv_orig_node *orig_node;
 540         struct batadv_orig_ifinfo *orig_ifinfo;
 541
 542         orig_node = container_of(rcu, struct batadv_orig_node, rcu);
 543
 544         spin_lock_bh(&orig_node->neigh_list_lock);
 545
 546         /* for all neighbors towards this originator ... */
 547         hlist_for_each_entry_safe(neigh_node, node_tmp,
 548                                   &orig_node->neigh_list, list) {
 549                 hlist_del_rcu(&neigh_node->list);
 550                 batadv_neigh_node_free_ref_now(neigh_node);
 551         }
 552
 553         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 554                                   &orig_node->ifinfo_list, list) {
 555                 hlist_del_rcu(&orig_ifinfo->list);
 556                 batadv_orig_ifinfo_free_ref_now(orig_ifinfo);
 557         }
 558         spin_unlock_bh(&orig_node->neigh_list_lock);
 559
 560         /* Free nc_nodes */
 561         batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 562
 563         batadv_frag_purge_orig(orig_node, NULL);
 564
 565         batadv_tt_global_del_orig(orig_node->bat_priv, orig_node, -1,
 566                                   "originator timed out");
 567
 568         if (orig_node->bat_priv->bat_algo_ops->bat_orig_free)
 569                 orig_node->bat_priv->bat_algo_ops->bat_orig_free(orig_node);
 570
 571         kfree(orig_node->tt_buff);
 572         kfree(orig_node);
 573 }
 574
 575 /**
 576  * batadv_orig_node_free_ref - decrement the orig node refcounter and possibly
 577  * schedule an rcu callback for freeing it
 578  * @orig_node: the orig node to free
 579  */
 580 void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
 581 {
 582         if (atomic_dec_and_test(&orig_node->refcount))
 583                 call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
 584 }
 585
 586 /**
 587  * batadv_orig_node_free_ref_now - decrement the orig node refcounter and
 588  * possibly free it (without rcu callback)
 589  * @orig_node: the orig node to free
 590  */
 591 void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node)
 592 {
 593         if (atomic_dec_and_test(&orig_node->refcount))
 594                 batadv_orig_node_free_rcu(&orig_node->rcu);
 595 }
 596
 597 void batadv_originator_free(struct batadv_priv *bat_priv)
 598 {
 599         struct batadv_hashtable *hash = bat_priv->orig_hash;
 600         struct hlist_node *node_tmp;
 601         struct hlist_head *head;
 602         spinlock_t *list_lock; /* spinlock to protect write access */
 603         struct batadv_orig_node *orig_node;
 604         uint32_t i;
 605
 606         if (!hash)
 607                 return;
 608
 609         cancel_delayed_work_sync(&bat_priv->orig_work);
 610
 611         bat_priv->orig_hash = NULL;
 612
 613         for (i = 0; i < hash->size; i++) {
 614                 head = &hash->table[i];
 615                 list_lock = &hash->list_locks[i];
 616
 617                 spin_lock_bh(list_lock);
 618                 hlist_for_each_entry_safe(orig_node, node_tmp,
 619                                           head, hash_entry) {
 620                         hlist_del_rcu(&orig_node->hash_entry);
 621                         batadv_orig_node_free_ref(orig_node);
 622                 }
 623                 spin_unlock_bh(list_lock);
 624         }
 625
 626         batadv_hash_destroy(hash);
 627 }
 628
 629 /**
 630  * batadv_orig_node_new - creates a new orig_node
 631  * @bat_priv: the bat priv with all the soft interface information
 632  * @addr: the mac address of the originator
 633  *
 634  * Creates a new originator object and initialise all the generic fields.
 635  * The new object is not added to the originator list.
 636  * Returns the newly created object or NULL on failure.
 637  */
 638 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
 639                                               const uint8_t *addr)
 640 {
 641         struct batadv_orig_node *orig_node;
 642         struct batadv_orig_node_vlan *vlan;
 643         unsigned long reset_time;
 644         int i;
 645
 646         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 647                    "Creating new originator: %pM\n", addr);
 648
 649         orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
 650         if (!orig_node)
 651                 return NULL;
 652
 653         INIT_HLIST_HEAD(&orig_node->neigh_list);
 654         INIT_LIST_HEAD(&orig_node->vlan_list);
 655         INIT_HLIST_HEAD(&orig_node->ifinfo_list);
 656         spin_lock_init(&orig_node->bcast_seqno_lock);
 657         spin_lock_init(&orig_node->neigh_list_lock);
 658         spin_lock_init(&orig_node->tt_buff_lock);
 659         spin_lock_init(&orig_node->tt_lock);
 660         spin_lock_init(&orig_node->vlan_list_lock);
 661
 662         batadv_nc_init_orig(orig_node);
 663
 664         /* extra reference for return */
 665         atomic_set(&orig_node->refcount, 2);
 666
 667         orig_node->tt_initialised = false;
 668         orig_node->bat_priv = bat_priv;
 669         memcpy(orig_node->orig, addr, ETH_ALEN);
 670         batadv_dat_init_orig_node_addr(orig_node);
 671         atomic_set(&orig_node->last_ttvn, 0);
 672         orig_node->tt_buff = NULL;
 673         orig_node->tt_buff_len = 0;
 674         reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 675         orig_node->bcast_seqno_reset = reset_time;
 676
 677         /* create a vlan object for the "untagged" LAN */
 678         vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);
 679         if (!vlan)
 680                 goto free_orig_node;
 681         /* batadv_orig_node_vlan_new() increases the refcounter.
 682          * Immediately release vlan since it is not needed anymore in this
 683          * context
 684          */
 685         batadv_orig_node_vlan_free_ref(vlan);
 686
 687         for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
 688                 INIT_HLIST_HEAD(&orig_node->fragments[i].head);
 689                 spin_lock_init(&orig_node->fragments[i].lock);
 690                 orig_node->fragments[i].size = 0;
 691         }
 692
 693         return orig_node;
 694 free_orig_node:
 695         kfree(orig_node);
 696         return NULL;
 697 }
 698
 699 /**
 700  * batadv_purge_orig_ifinfo - purge obsolete ifinfo entries from originator
 701  * @bat_priv: the bat priv with all the soft interface information
 702  * @orig_node: orig node which is to be checked
 703  *
 704  * Returns true if any ifinfo entry was purged, false otherwise.
 705  */
 706 static bool
 707 batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv,
 708                          struct batadv_orig_node *orig_node)
 709 {
 710         struct batadv_orig_ifinfo *orig_ifinfo;
 711         struct batadv_hard_iface *if_outgoing;
 712         struct hlist_node *node_tmp;
 713         bool ifinfo_purged = false;
 714
 715         spin_lock_bh(&orig_node->neigh_list_lock);
 716
 717         /* for all ifinfo objects for this originator */
 718         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 719                                   &orig_node->ifinfo_list, list) {
 720                 if_outgoing = orig_ifinfo->if_outgoing;
 721
 722                 /* always keep the default interface */
 723                 if (if_outgoing == BATADV_IF_DEFAULT)
 724                         continue;
 725
 726                 /* don't purge if the interface is not (going) down */
 727                 if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
 728                     (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
 729                     (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
 730                         continue;
 731
 732                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 733                            "router/ifinfo purge: originator %pM, iface: %s\n",
 734                            orig_node->orig, if_outgoing->net_dev->name);
 735
 736                 ifinfo_purged = true;
 737
 738                 hlist_del_rcu(&orig_ifinfo->list);
 739                 batadv_orig_ifinfo_free_ref(orig_ifinfo);
 740                 if (orig_node->last_bonding_candidate == orig_ifinfo) {
 741                         orig_node->last_bonding_candidate = NULL;
 742                         batadv_orig_ifinfo_free_ref(orig_ifinfo);
 743                 }
 744         }
 745
 746         spin_unlock_bh(&orig_node->neigh_list_lock);
 747
 748         return ifinfo_purged;
 749 }
 750
 751
 752 /**
 753  * batadv_purge_orig_neighbors - purges neighbors from originator
 754  * @bat_priv: the bat priv with all the soft interface information
 755  * @orig_node: orig node which is to be checked
 756  *
 757  * Returns true if any neighbor was purged, false otherwise
 758  */
 759 static bool
 760 batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
 761                             struct batadv_orig_node *orig_node)
 762 {
 763         struct hlist_node *node_tmp;
 764         struct batadv_neigh_node *neigh_node;
 765         bool neigh_purged = false;
 766         unsigned long last_seen;
 767         struct batadv_hard_iface *if_incoming;
 768
 769         spin_lock_bh(&orig_node->neigh_list_lock);
 770
 771         /* for all neighbors towards this originator ... */
 772         hlist_for_each_entry_safe(neigh_node, node_tmp,
 773                                   &orig_node->neigh_list, list) {
 774                 last_seen = neigh_node->last_seen;
 775                 if_incoming = neigh_node->if_incoming;
 776
 777                 if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) ||
 778                     (if_incoming->if_status == BATADV_IF_INACTIVE) ||
 779                     (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 780                     (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) {
 781                         if ((if_incoming->if_status == BATADV_IF_INACTIVE) ||
 782                             (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 783                             (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED))
 784                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 785                                            "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
 786                                            orig_node->orig, neigh_node->addr,
 787                                            if_incoming->net_dev->name);
 788                         else
 789                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 790                                            "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
 791                                            orig_node->orig, neigh_node->addr,
 792                                            jiffies_to_msecs(last_seen));
 793
 794                         neigh_purged = true;
 795
 796                         hlist_del_rcu(&neigh_node->list);
 797                         batadv_neigh_node_free_ref(neigh_node);
 798                 }
 799         }
 800
 801         spin_unlock_bh(&orig_node->neigh_list_lock);
 802         return neigh_purged;
 803 }
 804
 805 /**
 806  * batadv_find_best_neighbor - finds the best neighbor after purging
 807  * @bat_priv: the bat priv with all the soft interface information
 808  * @orig_node: orig node which is to be checked
 809  * @if_outgoing: the interface for which the metric should be compared
 810  *
 811  * Returns the current best neighbor, with refcount increased.
 812  */
 813 static struct batadv_neigh_node *
 814 batadv_find_best_neighbor(struct batadv_priv *bat_priv,
 815                           struct batadv_orig_node *orig_node,
 816                           struct batadv_hard_iface *if_outgoing)
 817 {
 818         struct batadv_neigh_node *best = NULL, *neigh;
 819         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
 820
 821         rcu_read_lock();
 822         hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) {
 823                 if (best && (bao->bat_neigh_cmp(neigh, if_outgoing,
 824                                                 best, if_outgoing) <= 0))
 825                         continue;
 826
 827                 if (!atomic_inc_not_zero(&neigh->refcount))
 828                         continue;
 829
 830                 if (best)
 831                         batadv_neigh_node_free_ref(best);
 832
 833                 best = neigh;
 834         }
 835         rcu_read_unlock();
 836
 837         return best;
 838 }
 839
 840 /**
 841  * batadv_purge_orig_node - purges obsolete information from an orig_node
 842  * @bat_priv: the bat priv with all the soft interface information
 843  * @orig_node: orig node which is to be checked
 844  *
 845  * This function checks if the orig_node or substructures of it have become
 846  * obsolete, and purges this information if that's the case.
 847  *
 848  * Returns true if the orig_node is to be removed, false otherwise.
 849  */
 850 static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
 851                                    struct batadv_orig_node *orig_node)
 852 {
 853         struct batadv_neigh_node *best_neigh_node;
 854         struct batadv_hard_iface *hard_iface;
 855         bool changed;
 856
 857         if (batadv_has_timed_out(orig_node->last_seen,
 858                                  2 * BATADV_PURGE_TIMEOUT)) {
 859                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 860                            "Originator timeout: originator %pM, last_seen %u\n",
 861                            orig_node->orig,
 862                            jiffies_to_msecs(orig_node->last_seen));
 863                 return true;
 864         }
 865         changed = batadv_purge_orig_ifinfo(bat_priv, orig_node);
 866         changed = changed || batadv_purge_orig_neighbors(bat_priv, orig_node);
 867
 868         if (!changed)
 869                 return false;
 870
 871         /* first for NULL ... */
 872         best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node,
 873                                                     BATADV_IF_DEFAULT);
 874         batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT,
 875                             best_neigh_node);
 876         if (best_neigh_node)
 877                 batadv_neigh_node_free_ref(best_neigh_node);
 878
 879         /* ... then for all other interfaces. */
 880         rcu_read_lock();
 881         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 882                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
 883                         continue;
 884
 885                 if (hard_iface->soft_iface != bat_priv->soft_iface)
 886                         continue;
 887
 888                 best_neigh_node = batadv_find_best_neighbor(bat_priv,
 889                                                             orig_node,
 890                                                             hard_iface);
 891                 batadv_update_route(bat_priv, orig_node, hard_iface,
 892                                     best_neigh_node);
 893                 if (best_neigh_node)
 894                         batadv_neigh_node_free_ref(best_neigh_node);
 895         }
 896         rcu_read_unlock();
 897
 898         return false;
 899 }
 900
 901 static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 902 {
 903         struct batadv_hashtable *hash = bat_priv->orig_hash;
 904         struct hlist_node *node_tmp;
 905         struct hlist_head *head;
 906         spinlock_t *list_lock; /* spinlock to protect write access */
 907         struct batadv_orig_node *orig_node;
 908         uint32_t i;
 909
 910         if (!hash)
 911                 return;
 912
 913         /* for all origins... */
 914         for (i = 0; i < hash->size; i++) {
 915                 head = &hash->table[i];
 916                 list_lock = &hash->list_locks[i];
 917
 918                 spin_lock_bh(list_lock);
 919                 hlist_for_each_entry_safe(orig_node, node_tmp,
 920                                           head, hash_entry) {
 921                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
 922                                 batadv_gw_node_delete(bat_priv, orig_node);
 923                                 hlist_del_rcu(&orig_node->hash_entry);
 924                                 batadv_orig_node_free_ref(orig_node);
 925                                 continue;
 926                         }
 927
 928                         batadv_frag_purge_orig(orig_node,
 929                                                batadv_frag_check_entry);
 930                 }
 931                 spin_unlock_bh(list_lock);
 932         }
 933
 934         batadv_gw_node_purge(bat_priv);
 935         batadv_gw_election(bat_priv);
 936 }
 937
 938 static void batadv_purge_orig(struct work_struct *work)
 939 {
 940         struct delayed_work *delayed_work;
 941         struct batadv_priv *bat_priv;
 942
 943         delayed_work = container_of(work, struct delayed_work, work);
 944         bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
 945         _batadv_purge_orig(bat_priv);
 946         queue_delayed_work(batadv_event_workqueue,
 947                            &bat_priv->orig_work,
 948                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 949 }
 950
 951 void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
 952 {
 953         _batadv_purge_orig(bat_priv);
 954 }
 955
 956 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
 957 {
 958         struct net_device *net_dev = (struct net_device *)seq->private;
 959         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 960         struct batadv_hard_iface *primary_if;
 961
 962         primary_if = batadv_seq_print_text_primary_if_get(seq);
 963         if (!primary_if)
 964                 return 0;
 965
 966         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
 967                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
 968                    primary_if->net_dev->dev_addr, net_dev->name,
 969                    bat_priv->bat_algo_ops->name);
 970
 971         batadv_hardif_free_ref(primary_if);
 972
 973         if (!bat_priv->bat_algo_ops->bat_orig_print) {
 974                 seq_puts(seq,
 975                          "No printing function for this routing protocol\n");
 976                 return 0;
 977         }
 978
 979         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq,
 980                                                BATADV_IF_DEFAULT);
 981
 982         return 0;
 983 }
 984
 985 /**
 986  * batadv_orig_hardif_seq_print_text - writes originator infos for a specific
 987  *  outgoing interface
 988  * @seq: debugfs table seq_file struct
 989  * @offset: not used
 990  *
 991  * Returns 0
 992  */
 993 int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset)
 994 {
 995         struct net_device *net_dev = (struct net_device *)seq->private;
 996         struct batadv_hard_iface *hard_iface;
 997         struct batadv_priv *bat_priv;
 998
 999         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1000
1001         if (!hard_iface || !hard_iface->soft_iface) {
1002                 seq_puts(seq, "Interface not known to B.A.T.M.A.N.\n");
1003                 goto out;
1004         }
1005
1006         bat_priv = netdev_priv(hard_iface->soft_iface);
1007         if (!bat_priv->bat_algo_ops->bat_orig_print) {
1008                 seq_puts(seq,
1009                          "No printing function for this routing protocol\n");
1010                 goto out;
1011         }
1012
1013         if (hard_iface->if_status != BATADV_IF_ACTIVE) {
1014                 seq_puts(seq, "Interface not active\n");
1015                 goto out;
1016         }
1017
1018         seq_printf(seq, "[B.A.T.M.A.N. adv %s, IF/MAC: %s/%pM (%s %s)]\n",
1019                    BATADV_SOURCE_VERSION, hard_iface->net_dev->name,
1020                    hard_iface->net_dev->dev_addr,
1021                    hard_iface->soft_iface->name, bat_priv->bat_algo_ops->name);
1022
1023         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, hard_iface);
1024
1025 out:
1026         batadv_hardif_free_ref(hard_iface);
1027         return 0;
1028 }
1029
1030 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
1031                             int max_if_num)
1032 {
1033         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
1034         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1035         struct batadv_hashtable *hash = bat_priv->orig_hash;
1036         struct hlist_head *head;
1037         struct batadv_orig_node *orig_node;
1038         uint32_t i;
1039         int ret;
1040
1041         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1042          * if_num
1043          */
1044         for (i = 0; i < hash->size; i++) {
1045                 head = &hash->table[i];
1046
1047                 rcu_read_lock();
1048                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1049                         ret = 0;
1050                         if (bao->bat_orig_add_if)
1051                                 ret = bao->bat_orig_add_if(orig_node,
1052                                                            max_if_num);
1053                         if (ret == -ENOMEM)
1054                                 goto err;
1055                 }
1056                 rcu_read_unlock();
1057         }
1058
1059         return 0;
1060
1061 err:
1062         rcu_read_unlock();
1063         return -ENOMEM;
1064 }
1065
1066 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
1067                             int max_if_num)
1068 {
1069         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
1070         struct batadv_hashtable *hash = bat_priv->orig_hash;
1071         struct hlist_head *head;
1072         struct batadv_hard_iface *hard_iface_tmp;
1073         struct batadv_orig_node *orig_node;
1074         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1075         uint32_t i;
1076         int ret;
1077
1078         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1079          * if_num
1080          */
1081         for (i = 0; i < hash->size; i++) {
1082                 head = &hash->table[i];
1083
1084                 rcu_read_lock();
1085                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1086                         ret = 0;
1087                         if (bao->bat_orig_del_if)
1088                                 ret = bao->bat_orig_del_if(orig_node,
1089                                                            max_if_num,
1090                                                            hard_iface->if_num);
1091                         if (ret == -ENOMEM)
1092                                 goto err;
1093                 }
1094                 rcu_read_unlock();
1095         }
1096
1097         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
1098         rcu_read_lock();
1099         list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) {
1100                 if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE)
1101                         continue;
1102
1103                 if (hard_iface == hard_iface_tmp)
1104                         continue;
1105
1106                 if (hard_iface->soft_iface != hard_iface_tmp->soft_iface)
1107                         continue;
1108
1109                 if (hard_iface_tmp->if_num > hard_iface->if_num)
1110                         hard_iface_tmp->if_num--;
1111         }
1112         rcu_read_unlock();
1113
1114         hard_iface->if_num = -1;
1115         return 0;
1116
1117 err:
1118         rcu_read_unlock();
1119         return -ENOMEM;
1120 }