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_orig_ifinfo_free_rcu - free the orig_ifinfo object
 462  * @rcu: rcu pointer of the orig_ifinfo object
 463  */
 464 static void batadv_orig_ifinfo_free_rcu(struct rcu_head *rcu)
 465 {
 466         struct batadv_orig_ifinfo *orig_ifinfo;
 467
 468         orig_ifinfo = container_of(rcu, struct batadv_orig_ifinfo, rcu);
 469
 470         if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 471                 batadv_hardif_free_ref_now(orig_ifinfo->if_outgoing);
 472
 473         kfree(orig_ifinfo);
 474 }
 475
 476 /**
 477  * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly free
 478  *  the orig_ifinfo (without rcu callback)
 479  * @orig_ifinfo: the orig_ifinfo object to release
 480  */
 481 static void
 482 batadv_orig_ifinfo_free_ref_now(struct batadv_orig_ifinfo *orig_ifinfo)
 483 {
 484         if (atomic_dec_and_test(&orig_ifinfo->refcount))
 485                 batadv_orig_ifinfo_free_rcu(&orig_ifinfo->rcu);
 486 }
 487
 488 /**
 489  * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly free
 490  *  the orig_ifinfo
 491  * @orig_ifinfo: the orig_ifinfo object to release
 492  */
 493 void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo)
 494 {
 495         if (atomic_dec_and_test(&orig_ifinfo->refcount))
 496                 call_rcu(&orig_ifinfo->rcu, batadv_orig_ifinfo_free_rcu);
 497 }
 498
 499 static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 500 {
 501         struct hlist_node *node_tmp;
 502         struct batadv_neigh_node *neigh_node;
 503         struct batadv_orig_node *orig_node;
 504         struct batadv_orig_ifinfo *orig_ifinfo;
 505
 506         orig_node = container_of(rcu, struct batadv_orig_node, rcu);
 507
 508         spin_lock_bh(&orig_node->neigh_list_lock);
 509
 510         /* for all neighbors towards this originator ... */
 511         hlist_for_each_entry_safe(neigh_node, node_tmp,
 512                                   &orig_node->neigh_list, list) {
 513                 hlist_del_rcu(&neigh_node->list);
 514                 batadv_neigh_node_free_ref_now(neigh_node);
 515         }
 516
 517         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 518                                   &orig_node->ifinfo_list, list) {
 519                 hlist_del_rcu(&orig_ifinfo->list);
 520                 batadv_orig_ifinfo_free_ref_now(orig_ifinfo);
 521         }
 522         spin_unlock_bh(&orig_node->neigh_list_lock);
 523
 524         /* Free nc_nodes */
 525         batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 526
 527         batadv_frag_purge_orig(orig_node, NULL);
 528
 529         batadv_tt_global_del_orig(orig_node->bat_priv, orig_node, -1,
 530                                   "originator timed out");
 531
 532         if (orig_node->bat_priv->bat_algo_ops->bat_orig_free)
 533                 orig_node->bat_priv->bat_algo_ops->bat_orig_free(orig_node);
 534
 535         kfree(orig_node->tt_buff);
 536         kfree(orig_node);
 537 }
 538
 539 /**
 540  * batadv_orig_node_free_ref - decrement the orig node refcounter and possibly
 541  * schedule an rcu callback for freeing it
 542  * @orig_node: the orig node to free
 543  */
 544 void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
 545 {
 546         if (atomic_dec_and_test(&orig_node->refcount))
 547                 call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
 548 }
 549
 550 /**
 551  * batadv_orig_node_free_ref_now - decrement the orig node refcounter and
 552  * possibly free it (without rcu callback)
 553  * @orig_node: the orig node to free
 554  */
 555 void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node)
 556 {
 557         if (atomic_dec_and_test(&orig_node->refcount))
 558                 batadv_orig_node_free_rcu(&orig_node->rcu);
 559 }
 560
 561 void batadv_originator_free(struct batadv_priv *bat_priv)
 562 {
 563         struct batadv_hashtable *hash = bat_priv->orig_hash;
 564         struct hlist_node *node_tmp;
 565         struct hlist_head *head;
 566         spinlock_t *list_lock; /* spinlock to protect write access */
 567         struct batadv_orig_node *orig_node;
 568         uint32_t i;
 569
 570         if (!hash)
 571                 return;
 572
 573         cancel_delayed_work_sync(&bat_priv->orig_work);
 574
 575         bat_priv->orig_hash = NULL;
 576
 577         for (i = 0; i < hash->size; i++) {
 578                 head = &hash->table[i];
 579                 list_lock = &hash->list_locks[i];
 580
 581                 spin_lock_bh(list_lock);
 582                 hlist_for_each_entry_safe(orig_node, node_tmp,
 583                                           head, hash_entry) {
 584                         hlist_del_rcu(&orig_node->hash_entry);
 585                         batadv_orig_node_free_ref(orig_node);
 586                 }
 587                 spin_unlock_bh(list_lock);
 588         }
 589
 590         batadv_hash_destroy(hash);
 591 }
 592
 593 /**
 594  * batadv_orig_node_new - creates a new orig_node
 595  * @bat_priv: the bat priv with all the soft interface information
 596  * @addr: the mac address of the originator
 597  *
 598  * Creates a new originator object and initialise all the generic fields.
 599  * The new object is not added to the originator list.
 600  * Returns the newly created object or NULL on failure.
 601  */
 602 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
 603                                               const uint8_t *addr)
 604 {
 605         struct batadv_orig_node *orig_node;
 606         struct batadv_orig_node_vlan *vlan;
 607         unsigned long reset_time;
 608         int i;
 609
 610         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 611                    "Creating new originator: %pM\n", addr);
 612
 613         orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
 614         if (!orig_node)
 615                 return NULL;
 616
 617         INIT_HLIST_HEAD(&orig_node->neigh_list);
 618         INIT_LIST_HEAD(&orig_node->vlan_list);
 619         INIT_HLIST_HEAD(&orig_node->ifinfo_list);
 620         spin_lock_init(&orig_node->bcast_seqno_lock);
 621         spin_lock_init(&orig_node->neigh_list_lock);
 622         spin_lock_init(&orig_node->tt_buff_lock);
 623         spin_lock_init(&orig_node->tt_lock);
 624         spin_lock_init(&orig_node->vlan_list_lock);
 625
 626         batadv_nc_init_orig(orig_node);
 627
 628         /* extra reference for return */
 629         atomic_set(&orig_node->refcount, 2);
 630
 631         orig_node->tt_initialised = false;
 632         orig_node->bat_priv = bat_priv;
 633         memcpy(orig_node->orig, addr, ETH_ALEN);
 634         batadv_dat_init_orig_node_addr(orig_node);
 635         atomic_set(&orig_node->last_ttvn, 0);
 636         orig_node->tt_buff = NULL;
 637         orig_node->tt_buff_len = 0;
 638         reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 639         orig_node->bcast_seqno_reset = reset_time;
 640
 641         /* create a vlan object for the "untagged" LAN */
 642         vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);
 643         if (!vlan)
 644                 goto free_orig_node;
 645         /* batadv_orig_node_vlan_new() increases the refcounter.
 646          * Immediately release vlan since it is not needed anymore in this
 647          * context
 648          */
 649         batadv_orig_node_vlan_free_ref(vlan);
 650
 651         for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
 652                 INIT_HLIST_HEAD(&orig_node->fragments[i].head);
 653                 spin_lock_init(&orig_node->fragments[i].lock);
 654                 orig_node->fragments[i].size = 0;
 655         }
 656
 657         return orig_node;
 658 free_orig_node:
 659         kfree(orig_node);
 660         return NULL;
 661 }
 662
 663 /**
 664  * batadv_purge_orig_ifinfo - purge obsolete ifinfo entries from originator
 665  * @bat_priv: the bat priv with all the soft interface information
 666  * @orig_node: orig node which is to be checked
 667  *
 668  * Returns true if any ifinfo entry was purged, false otherwise.
 669  */
 670 static bool
 671 batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv,
 672                          struct batadv_orig_node *orig_node)
 673 {
 674         struct batadv_orig_ifinfo *orig_ifinfo;
 675         struct batadv_hard_iface *if_outgoing;
 676         struct hlist_node *node_tmp;
 677         bool ifinfo_purged = false;
 678
 679         spin_lock_bh(&orig_node->neigh_list_lock);
 680
 681         /* for all ifinfo objects for this originator */
 682         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 683                                   &orig_node->ifinfo_list, list) {
 684                 if_outgoing = orig_ifinfo->if_outgoing;
 685
 686                 /* always keep the default interface */
 687                 if (if_outgoing == BATADV_IF_DEFAULT)
 688                         continue;
 689
 690                 /* don't purge if the interface is not (going) down */
 691                 if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
 692                     (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
 693                     (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
 694                         continue;
 695
 696                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 697                            "router/ifinfo purge: originator %pM, iface: %s\n",
 698                            orig_node->orig, if_outgoing->net_dev->name);
 699
 700                 ifinfo_purged = true;
 701
 702                 hlist_del_rcu(&orig_ifinfo->list);
 703                 batadv_orig_ifinfo_free_ref(orig_ifinfo);
 704                 if (orig_node->last_bonding_candidate == orig_ifinfo) {
 705                         orig_node->last_bonding_candidate = NULL;
 706                         batadv_orig_ifinfo_free_ref(orig_ifinfo);
 707                 }
 708         }
 709
 710         spin_unlock_bh(&orig_node->neigh_list_lock);
 711
 712         return ifinfo_purged;
 713 }
 714
 715
 716 /**
 717  * batadv_purge_orig_neighbors - purges neighbors from originator
 718  * @bat_priv: the bat priv with all the soft interface information
 719  * @orig_node: orig node which is to be checked
 720  *
 721  * Returns true if any neighbor was purged, false otherwise
 722  */
 723 static bool
 724 batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
 725                             struct batadv_orig_node *orig_node)
 726 {
 727         struct hlist_node *node_tmp;
 728         struct batadv_neigh_node *neigh_node;
 729         bool neigh_purged = false;
 730         unsigned long last_seen;
 731         struct batadv_hard_iface *if_incoming;
 732
 733         spin_lock_bh(&orig_node->neigh_list_lock);
 734
 735         /* for all neighbors towards this originator ... */
 736         hlist_for_each_entry_safe(neigh_node, node_tmp,
 737                                   &orig_node->neigh_list, list) {
 738                 last_seen = neigh_node->last_seen;
 739                 if_incoming = neigh_node->if_incoming;
 740
 741                 if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) ||
 742                     (if_incoming->if_status == BATADV_IF_INACTIVE) ||
 743                     (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 744                     (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) {
 745                         if ((if_incoming->if_status == BATADV_IF_INACTIVE) ||
 746                             (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 747                             (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED))
 748                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 749                                            "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
 750                                            orig_node->orig, neigh_node->addr,
 751                                            if_incoming->net_dev->name);
 752                         else
 753                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 754                                            "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
 755                                            orig_node->orig, neigh_node->addr,
 756                                            jiffies_to_msecs(last_seen));
 757
 758                         neigh_purged = true;
 759
 760                         hlist_del_rcu(&neigh_node->list);
 761                         batadv_neigh_node_free_ref(neigh_node);
 762                 }
 763         }
 764
 765         spin_unlock_bh(&orig_node->neigh_list_lock);
 766         return neigh_purged;
 767 }
 768
 769 /**
 770  * batadv_find_best_neighbor - finds the best neighbor after purging
 771  * @bat_priv: the bat priv with all the soft interface information
 772  * @orig_node: orig node which is to be checked
 773  * @if_outgoing: the interface for which the metric should be compared
 774  *
 775  * Returns the current best neighbor, with refcount increased.
 776  */
 777 static struct batadv_neigh_node *
 778 batadv_find_best_neighbor(struct batadv_priv *bat_priv,
 779                           struct batadv_orig_node *orig_node,
 780                           struct batadv_hard_iface *if_outgoing)
 781 {
 782         struct batadv_neigh_node *best = NULL, *neigh;
 783         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
 784
 785         rcu_read_lock();
 786         hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) {
 787                 if (best && (bao->bat_neigh_cmp(neigh, if_outgoing,
 788                                                 best, if_outgoing) <= 0))
 789                         continue;
 790
 791                 if (!atomic_inc_not_zero(&neigh->refcount))
 792                         continue;
 793
 794                 if (best)
 795                         batadv_neigh_node_free_ref(best);
 796
 797                 best = neigh;
 798         }
 799         rcu_read_unlock();
 800
 801         return best;
 802 }
 803
 804 /**
 805  * batadv_purge_orig_node - purges obsolete information from an orig_node
 806  * @bat_priv: the bat priv with all the soft interface information
 807  * @orig_node: orig node which is to be checked
 808  *
 809  * This function checks if the orig_node or substructures of it have become
 810  * obsolete, and purges this information if that's the case.
 811  *
 812  * Returns true if the orig_node is to be removed, false otherwise.
 813  */
 814 static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
 815                                    struct batadv_orig_node *orig_node)
 816 {
 817         struct batadv_neigh_node *best_neigh_node;
 818         struct batadv_hard_iface *hard_iface;
 819         bool changed;
 820
 821         if (batadv_has_timed_out(orig_node->last_seen,
 822                                  2 * BATADV_PURGE_TIMEOUT)) {
 823                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 824                            "Originator timeout: originator %pM, last_seen %u\n",
 825                            orig_node->orig,
 826                            jiffies_to_msecs(orig_node->last_seen));
 827                 return true;
 828         }
 829         changed = batadv_purge_orig_ifinfo(bat_priv, orig_node);
 830         changed = changed || batadv_purge_orig_neighbors(bat_priv, orig_node);
 831
 832         if (!changed)
 833                 return false;
 834
 835         /* first for NULL ... */
 836         best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node,
 837                                                     BATADV_IF_DEFAULT);
 838         batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT,
 839                             best_neigh_node);
 840         if (best_neigh_node)
 841                 batadv_neigh_node_free_ref(best_neigh_node);
 842
 843         /* ... then for all other interfaces. */
 844         rcu_read_lock();
 845         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 846                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
 847                         continue;
 848
 849                 if (hard_iface->soft_iface != bat_priv->soft_iface)
 850                         continue;
 851
 852                 best_neigh_node = batadv_find_best_neighbor(bat_priv,
 853                                                             orig_node,
 854                                                             hard_iface);
 855                 batadv_update_route(bat_priv, orig_node, hard_iface,
 856                                     best_neigh_node);
 857                 if (best_neigh_node)
 858                         batadv_neigh_node_free_ref(best_neigh_node);
 859         }
 860         rcu_read_unlock();
 861
 862         return false;
 863 }
 864
 865 static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 866 {
 867         struct batadv_hashtable *hash = bat_priv->orig_hash;
 868         struct hlist_node *node_tmp;
 869         struct hlist_head *head;
 870         spinlock_t *list_lock; /* spinlock to protect write access */
 871         struct batadv_orig_node *orig_node;
 872         uint32_t i;
 873
 874         if (!hash)
 875                 return;
 876
 877         /* for all origins... */
 878         for (i = 0; i < hash->size; i++) {
 879                 head = &hash->table[i];
 880                 list_lock = &hash->list_locks[i];
 881
 882                 spin_lock_bh(list_lock);
 883                 hlist_for_each_entry_safe(orig_node, node_tmp,
 884                                           head, hash_entry) {
 885                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
 886                                 batadv_gw_node_delete(bat_priv, orig_node);
 887                                 hlist_del_rcu(&orig_node->hash_entry);
 888                                 batadv_orig_node_free_ref(orig_node);
 889                                 continue;
 890                         }
 891
 892                         batadv_frag_purge_orig(orig_node,
 893                                                batadv_frag_check_entry);
 894                 }
 895                 spin_unlock_bh(list_lock);
 896         }
 897
 898         batadv_gw_node_purge(bat_priv);
 899         batadv_gw_election(bat_priv);
 900 }
 901
 902 static void batadv_purge_orig(struct work_struct *work)
 903 {
 904         struct delayed_work *delayed_work;
 905         struct batadv_priv *bat_priv;
 906
 907         delayed_work = container_of(work, struct delayed_work, work);
 908         bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
 909         _batadv_purge_orig(bat_priv);
 910         queue_delayed_work(batadv_event_workqueue,
 911                            &bat_priv->orig_work,
 912                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 913 }
 914
 915 void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
 916 {
 917         _batadv_purge_orig(bat_priv);
 918 }
 919
 920 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
 921 {
 922         struct net_device *net_dev = (struct net_device *)seq->private;
 923         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 924         struct batadv_hard_iface *primary_if;
 925
 926         primary_if = batadv_seq_print_text_primary_if_get(seq);
 927         if (!primary_if)
 928                 return 0;
 929
 930         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
 931                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
 932                    primary_if->net_dev->dev_addr, net_dev->name,
 933                    bat_priv->bat_algo_ops->name);
 934
 935         batadv_hardif_free_ref(primary_if);
 936
 937         if (!bat_priv->bat_algo_ops->bat_orig_print) {
 938                 seq_puts(seq,
 939                          "No printing function for this routing protocol\n");
 940                 return 0;
 941         }
 942
 943         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq,
 944                                                BATADV_IF_DEFAULT);
 945
 946         return 0;
 947 }
 948
 949 /**
 950  * batadv_orig_hardif_seq_print_text - writes originator infos for a specific
 951  *  outgoing interface
 952  * @seq: debugfs table seq_file struct
 953  * @offset: not used
 954  *
 955  * Returns 0
 956  */
 957 int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset)
 958 {
 959         struct net_device *net_dev = (struct net_device *)seq->private;
 960         struct batadv_hard_iface *hard_iface;
 961         struct batadv_priv *bat_priv;
 962
 963         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 964
 965         if (!hard_iface || !hard_iface->soft_iface) {
 966                 seq_puts(seq, "Interface not known to B.A.T.M.A.N.\n");
 967                 goto out;
 968         }
 969
 970         bat_priv = netdev_priv(hard_iface->soft_iface);
 971         if (!bat_priv->bat_algo_ops->bat_orig_print) {
 972                 seq_puts(seq,
 973                          "No printing function for this routing protocol\n");
 974                 goto out;
 975         }
 976
 977         if (hard_iface->if_status != BATADV_IF_ACTIVE) {
 978                 seq_puts(seq, "Interface not active\n");
 979                 goto out;
 980         }
 981
 982         seq_printf(seq, "[B.A.T.M.A.N. adv %s, IF/MAC: %s/%pM (%s %s)]\n",
 983                    BATADV_SOURCE_VERSION, hard_iface->net_dev->name,
 984                    hard_iface->net_dev->dev_addr,
 985                    hard_iface->soft_iface->name, bat_priv->bat_algo_ops->name);
 986
 987         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, hard_iface);
 988
 989 out:
 990         batadv_hardif_free_ref(hard_iface);
 991         return 0;
 992 }
 993
 994 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
 995                             int max_if_num)
 996 {
 997         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 998         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
 999         struct batadv_hashtable *hash = bat_priv->orig_hash;
1000         struct hlist_head *head;
1001         struct batadv_orig_node *orig_node;
1002         uint32_t i;
1003         int ret;
1004
1005         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1006          * if_num
1007          */
1008         for (i = 0; i < hash->size; i++) {
1009                 head = &hash->table[i];
1010
1011                 rcu_read_lock();
1012                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1013                         ret = 0;
1014                         if (bao->bat_orig_add_if)
1015                                 ret = bao->bat_orig_add_if(orig_node,
1016                                                            max_if_num);
1017                         if (ret == -ENOMEM)
1018                                 goto err;
1019                 }
1020                 rcu_read_unlock();
1021         }
1022
1023         return 0;
1024
1025 err:
1026         rcu_read_unlock();
1027         return -ENOMEM;
1028 }
1029
1030 int batadv_orig_hash_del_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_hashtable *hash = bat_priv->orig_hash;
1035         struct hlist_head *head;
1036         struct batadv_hard_iface *hard_iface_tmp;
1037         struct batadv_orig_node *orig_node;
1038         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1039         uint32_t i;
1040         int ret;
1041
1042         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1043          * if_num
1044          */
1045         for (i = 0; i < hash->size; i++) {
1046                 head = &hash->table[i];
1047
1048                 rcu_read_lock();
1049                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1050                         ret = 0;
1051                         if (bao->bat_orig_del_if)
1052                                 ret = bao->bat_orig_del_if(orig_node,
1053                                                            max_if_num,
1054                                                            hard_iface->if_num);
1055                         if (ret == -ENOMEM)
1056                                 goto err;
1057                 }
1058                 rcu_read_unlock();
1059         }
1060
1061         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
1062         rcu_read_lock();
1063         list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) {
1064                 if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE)
1065                         continue;
1066
1067                 if (hard_iface == hard_iface_tmp)
1068                         continue;
1069
1070                 if (hard_iface->soft_iface != hard_iface_tmp->soft_iface)
1071                         continue;
1072
1073                 if (hard_iface_tmp->if_num > hard_iface->if_num)
1074                         hard_iface_tmp->if_num--;
1075         }
1076         rcu_read_unlock();
1077
1078         hard_iface->if_num = -1;
1079         return 0;
1080
1081 err:
1082         rcu_read_unlock();
1083         return -ENOMEM;
1084 }