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         struct batadv_neigh_node *router;
 504
 505         orig_ifinfo = container_of(rcu, struct batadv_orig_ifinfo, rcu);
 506
 507         if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 508                 batadv_hardif_free_ref_now(orig_ifinfo->if_outgoing);
 509
 510         /* this is the last reference to this object */
 511         router = rcu_dereference_protected(orig_ifinfo->router, true);
 512         if (router)
 513                 batadv_neigh_node_free_ref_now(router);
 514         kfree(orig_ifinfo);
 515 }
 516
 517 /**
 518  * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly free
 519  *  the orig_ifinfo (without rcu callback)
 520  * @orig_ifinfo: the orig_ifinfo object to release
 521  */
 522 static void
 523 batadv_orig_ifinfo_free_ref_now(struct batadv_orig_ifinfo *orig_ifinfo)
 524 {
 525         if (atomic_dec_and_test(&orig_ifinfo->refcount))
 526                 batadv_orig_ifinfo_free_rcu(&orig_ifinfo->rcu);
 527 }
 528
 529 /**
 530  * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly free
 531  *  the orig_ifinfo
 532  * @orig_ifinfo: the orig_ifinfo object to release
 533  */
 534 void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo)
 535 {
 536         if (atomic_dec_and_test(&orig_ifinfo->refcount))
 537                 call_rcu(&orig_ifinfo->rcu, batadv_orig_ifinfo_free_rcu);
 538 }
 539
 540 static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 541 {
 542         struct hlist_node *node_tmp;
 543         struct batadv_neigh_node *neigh_node;
 544         struct batadv_orig_node *orig_node;
 545         struct batadv_orig_ifinfo *orig_ifinfo;
 546
 547         orig_node = container_of(rcu, struct batadv_orig_node, rcu);
 548
 549         spin_lock_bh(&orig_node->neigh_list_lock);
 550
 551         /* for all neighbors towards this originator ... */
 552         hlist_for_each_entry_safe(neigh_node, node_tmp,
 553                                   &orig_node->neigh_list, list) {
 554                 hlist_del_rcu(&neigh_node->list);
 555                 batadv_neigh_node_free_ref_now(neigh_node);
 556         }
 557
 558         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 559                                   &orig_node->ifinfo_list, list) {
 560                 hlist_del_rcu(&orig_ifinfo->list);
 561                 batadv_orig_ifinfo_free_ref_now(orig_ifinfo);
 562         }
 563         spin_unlock_bh(&orig_node->neigh_list_lock);
 564
 565         /* Free nc_nodes */
 566         batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 567
 568         batadv_frag_purge_orig(orig_node, NULL);
 569
 570         batadv_tt_global_del_orig(orig_node->bat_priv, orig_node, -1,
 571                                   "originator timed out");
 572
 573         if (orig_node->bat_priv->bat_algo_ops->bat_orig_free)
 574                 orig_node->bat_priv->bat_algo_ops->bat_orig_free(orig_node);
 575
 576         kfree(orig_node->tt_buff);
 577         kfree(orig_node);
 578 }
 579
 580 /**
 581  * batadv_orig_node_free_ref - decrement the orig node refcounter and possibly
 582  * schedule an rcu callback for freeing it
 583  * @orig_node: the orig node to free
 584  */
 585 void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
 586 {
 587         if (atomic_dec_and_test(&orig_node->refcount))
 588                 call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
 589 }
 590
 591 /**
 592  * batadv_orig_node_free_ref_now - decrement the orig node refcounter and
 593  * possibly free it (without rcu callback)
 594  * @orig_node: the orig node to free
 595  */
 596 void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node)
 597 {
 598         if (atomic_dec_and_test(&orig_node->refcount))
 599                 batadv_orig_node_free_rcu(&orig_node->rcu);
 600 }
 601
 602 void batadv_originator_free(struct batadv_priv *bat_priv)
 603 {
 604         struct batadv_hashtable *hash = bat_priv->orig_hash;
 605         struct hlist_node *node_tmp;
 606         struct hlist_head *head;
 607         spinlock_t *list_lock; /* spinlock to protect write access */
 608         struct batadv_orig_node *orig_node;
 609         uint32_t i;
 610
 611         if (!hash)
 612                 return;
 613
 614         cancel_delayed_work_sync(&bat_priv->orig_work);
 615
 616         bat_priv->orig_hash = NULL;
 617
 618         for (i = 0; i < hash->size; i++) {
 619                 head = &hash->table[i];
 620                 list_lock = &hash->list_locks[i];
 621
 622                 spin_lock_bh(list_lock);
 623                 hlist_for_each_entry_safe(orig_node, node_tmp,
 624                                           head, hash_entry) {
 625                         hlist_del_rcu(&orig_node->hash_entry);
 626                         batadv_orig_node_free_ref(orig_node);
 627                 }
 628                 spin_unlock_bh(list_lock);
 629         }
 630
 631         batadv_hash_destroy(hash);
 632 }
 633
 634 /**
 635  * batadv_orig_node_new - creates a new orig_node
 636  * @bat_priv: the bat priv with all the soft interface information
 637  * @addr: the mac address of the originator
 638  *
 639  * Creates a new originator object and initialise all the generic fields.
 640  * The new object is not added to the originator list.
 641  * Returns the newly created object or NULL on failure.
 642  */
 643 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
 644                                               const uint8_t *addr)
 645 {
 646         struct batadv_orig_node *orig_node;
 647         struct batadv_orig_node_vlan *vlan;
 648         unsigned long reset_time;
 649         int i;
 650
 651         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 652                    "Creating new originator: %pM\n", addr);
 653
 654         orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
 655         if (!orig_node)
 656                 return NULL;
 657
 658         INIT_HLIST_HEAD(&orig_node->neigh_list);
 659         INIT_LIST_HEAD(&orig_node->vlan_list);
 660         INIT_HLIST_HEAD(&orig_node->ifinfo_list);
 661         spin_lock_init(&orig_node->bcast_seqno_lock);
 662         spin_lock_init(&orig_node->neigh_list_lock);
 663         spin_lock_init(&orig_node->tt_buff_lock);
 664         spin_lock_init(&orig_node->tt_lock);
 665         spin_lock_init(&orig_node->vlan_list_lock);
 666
 667         batadv_nc_init_orig(orig_node);
 668
 669         /* extra reference for return */
 670         atomic_set(&orig_node->refcount, 2);
 671
 672         orig_node->tt_initialised = false;
 673         orig_node->bat_priv = bat_priv;
 674         memcpy(orig_node->orig, addr, ETH_ALEN);
 675         batadv_dat_init_orig_node_addr(orig_node);
 676         atomic_set(&orig_node->last_ttvn, 0);
 677         orig_node->tt_buff = NULL;
 678         orig_node->tt_buff_len = 0;
 679         reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 680         orig_node->bcast_seqno_reset = reset_time;
 681
 682         /* create a vlan object for the "untagged" LAN */
 683         vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);
 684         if (!vlan)
 685                 goto free_orig_node;
 686         /* batadv_orig_node_vlan_new() increases the refcounter.
 687          * Immediately release vlan since it is not needed anymore in this
 688          * context
 689          */
 690         batadv_orig_node_vlan_free_ref(vlan);
 691
 692         for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
 693                 INIT_HLIST_HEAD(&orig_node->fragments[i].head);
 694                 spin_lock_init(&orig_node->fragments[i].lock);
 695                 orig_node->fragments[i].size = 0;
 696         }
 697
 698         return orig_node;
 699 free_orig_node:
 700         kfree(orig_node);
 701         return NULL;
 702 }
 703
 704 /**
 705  * batadv_purge_orig_ifinfo - purge obsolete ifinfo entries from originator
 706  * @bat_priv: the bat priv with all the soft interface information
 707  * @orig_node: orig node which is to be checked
 708  *
 709  * Returns true if any ifinfo entry was purged, false otherwise.
 710  */
 711 static bool
 712 batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv,
 713                          struct batadv_orig_node *orig_node)
 714 {
 715         struct batadv_orig_ifinfo *orig_ifinfo;
 716         struct batadv_hard_iface *if_outgoing;
 717         struct hlist_node *node_tmp;
 718         bool ifinfo_purged = false;
 719
 720         spin_lock_bh(&orig_node->neigh_list_lock);
 721
 722         /* for all ifinfo objects for this originator */
 723         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 724                                   &orig_node->ifinfo_list, list) {
 725                 if_outgoing = orig_ifinfo->if_outgoing;
 726
 727                 /* always keep the default interface */
 728                 if (if_outgoing == BATADV_IF_DEFAULT)
 729                         continue;
 730
 731                 /* don't purge if the interface is not (going) down */
 732                 if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
 733                     (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
 734                     (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
 735                         continue;
 736
 737                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 738                            "router/ifinfo purge: originator %pM, iface: %s\n",
 739                            orig_node->orig, if_outgoing->net_dev->name);
 740
 741                 ifinfo_purged = true;
 742
 743                 hlist_del_rcu(&orig_ifinfo->list);
 744                 batadv_orig_ifinfo_free_ref(orig_ifinfo);
 745                 if (orig_node->last_bonding_candidate == orig_ifinfo) {
 746                         orig_node->last_bonding_candidate = NULL;
 747                         batadv_orig_ifinfo_free_ref(orig_ifinfo);
 748                 }
 749         }
 750
 751         spin_unlock_bh(&orig_node->neigh_list_lock);
 752
 753         return ifinfo_purged;
 754 }
 755
 756
 757 /**
 758  * batadv_purge_orig_neighbors - purges neighbors from originator
 759  * @bat_priv: the bat priv with all the soft interface information
 760  * @orig_node: orig node which is to be checked
 761  *
 762  * Returns true if any neighbor was purged, false otherwise
 763  */
 764 static bool
 765 batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
 766                             struct batadv_orig_node *orig_node)
 767 {
 768         struct hlist_node *node_tmp;
 769         struct batadv_neigh_node *neigh_node;
 770         bool neigh_purged = false;
 771         unsigned long last_seen;
 772         struct batadv_hard_iface *if_incoming;
 773
 774         spin_lock_bh(&orig_node->neigh_list_lock);
 775
 776         /* for all neighbors towards this originator ... */
 777         hlist_for_each_entry_safe(neigh_node, node_tmp,
 778                                   &orig_node->neigh_list, list) {
 779                 last_seen = neigh_node->last_seen;
 780                 if_incoming = neigh_node->if_incoming;
 781
 782                 if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) ||
 783                     (if_incoming->if_status == BATADV_IF_INACTIVE) ||
 784                     (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 785                     (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) {
 786                         if ((if_incoming->if_status == BATADV_IF_INACTIVE) ||
 787                             (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 788                             (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED))
 789                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 790                                            "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
 791                                            orig_node->orig, neigh_node->addr,
 792                                            if_incoming->net_dev->name);
 793                         else
 794                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 795                                            "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
 796                                            orig_node->orig, neigh_node->addr,
 797                                            jiffies_to_msecs(last_seen));
 798
 799                         neigh_purged = true;
 800
 801                         hlist_del_rcu(&neigh_node->list);
 802                         batadv_neigh_node_free_ref(neigh_node);
 803                 }
 804         }
 805
 806         spin_unlock_bh(&orig_node->neigh_list_lock);
 807         return neigh_purged;
 808 }
 809
 810 /**
 811  * batadv_find_best_neighbor - finds the best neighbor after purging
 812  * @bat_priv: the bat priv with all the soft interface information
 813  * @orig_node: orig node which is to be checked
 814  * @if_outgoing: the interface for which the metric should be compared
 815  *
 816  * Returns the current best neighbor, with refcount increased.
 817  */
 818 static struct batadv_neigh_node *
 819 batadv_find_best_neighbor(struct batadv_priv *bat_priv,
 820                           struct batadv_orig_node *orig_node,
 821                           struct batadv_hard_iface *if_outgoing)
 822 {
 823         struct batadv_neigh_node *best = NULL, *neigh;
 824         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
 825
 826         rcu_read_lock();
 827         hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) {
 828                 if (best && (bao->bat_neigh_cmp(neigh, if_outgoing,
 829                                                 best, if_outgoing) <= 0))
 830                         continue;
 831
 832                 if (!atomic_inc_not_zero(&neigh->refcount))
 833                         continue;
 834
 835                 if (best)
 836                         batadv_neigh_node_free_ref(best);
 837
 838                 best = neigh;
 839         }
 840         rcu_read_unlock();
 841
 842         return best;
 843 }
 844
 845 /**
 846  * batadv_purge_orig_node - purges obsolete information from an orig_node
 847  * @bat_priv: the bat priv with all the soft interface information
 848  * @orig_node: orig node which is to be checked
 849  *
 850  * This function checks if the orig_node or substructures of it have become
 851  * obsolete, and purges this information if that's the case.
 852  *
 853  * Returns true if the orig_node is to be removed, false otherwise.
 854  */
 855 static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
 856                                    struct batadv_orig_node *orig_node)
 857 {
 858         struct batadv_neigh_node *best_neigh_node;
 859         struct batadv_hard_iface *hard_iface;
 860         bool changed_ifinfo, changed_neigh;
 861
 862         if (batadv_has_timed_out(orig_node->last_seen,
 863                                  2 * BATADV_PURGE_TIMEOUT)) {
 864                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 865                            "Originator timeout: originator %pM, last_seen %u\n",
 866                            orig_node->orig,
 867                            jiffies_to_msecs(orig_node->last_seen));
 868                 return true;
 869         }
 870         changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node);
 871         changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node);
 872
 873         if (!changed_ifinfo && !changed_neigh)
 874                 return false;
 875
 876         /* first for NULL ... */
 877         best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node,
 878                                                     BATADV_IF_DEFAULT);
 879         batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT,
 880                             best_neigh_node);
 881         if (best_neigh_node)
 882                 batadv_neigh_node_free_ref(best_neigh_node);
 883
 884         /* ... then for all other interfaces. */
 885         rcu_read_lock();
 886         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 887                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
 888                         continue;
 889
 890                 if (hard_iface->soft_iface != bat_priv->soft_iface)
 891                         continue;
 892
 893                 best_neigh_node = batadv_find_best_neighbor(bat_priv,
 894                                                             orig_node,
 895                                                             hard_iface);
 896                 batadv_update_route(bat_priv, orig_node, hard_iface,
 897                                     best_neigh_node);
 898                 if (best_neigh_node)
 899                         batadv_neigh_node_free_ref(best_neigh_node);
 900         }
 901         rcu_read_unlock();
 902
 903         return false;
 904 }
 905
 906 static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 907 {
 908         struct batadv_hashtable *hash = bat_priv->orig_hash;
 909         struct hlist_node *node_tmp;
 910         struct hlist_head *head;
 911         spinlock_t *list_lock; /* spinlock to protect write access */
 912         struct batadv_orig_node *orig_node;
 913         uint32_t i;
 914
 915         if (!hash)
 916                 return;
 917
 918         /* for all origins... */
 919         for (i = 0; i < hash->size; i++) {
 920                 head = &hash->table[i];
 921                 list_lock = &hash->list_locks[i];
 922
 923                 spin_lock_bh(list_lock);
 924                 hlist_for_each_entry_safe(orig_node, node_tmp,
 925                                           head, hash_entry) {
 926                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
 927                                 batadv_gw_node_delete(bat_priv, orig_node);
 928                                 hlist_del_rcu(&orig_node->hash_entry);
 929                                 batadv_orig_node_free_ref(orig_node);
 930                                 continue;
 931                         }
 932
 933                         batadv_frag_purge_orig(orig_node,
 934                                                batadv_frag_check_entry);
 935                 }
 936                 spin_unlock_bh(list_lock);
 937         }
 938
 939         batadv_gw_node_purge(bat_priv);
 940         batadv_gw_election(bat_priv);
 941 }
 942
 943 static void batadv_purge_orig(struct work_struct *work)
 944 {
 945         struct delayed_work *delayed_work;
 946         struct batadv_priv *bat_priv;
 947
 948         delayed_work = container_of(work, struct delayed_work, work);
 949         bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
 950         _batadv_purge_orig(bat_priv);
 951         queue_delayed_work(batadv_event_workqueue,
 952                            &bat_priv->orig_work,
 953                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 954 }
 955
 956 void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
 957 {
 958         _batadv_purge_orig(bat_priv);
 959 }
 960
 961 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
 962 {
 963         struct net_device *net_dev = (struct net_device *)seq->private;
 964         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 965         struct batadv_hard_iface *primary_if;
 966
 967         primary_if = batadv_seq_print_text_primary_if_get(seq);
 968         if (!primary_if)
 969                 return 0;
 970
 971         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
 972                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
 973                    primary_if->net_dev->dev_addr, net_dev->name,
 974                    bat_priv->bat_algo_ops->name);
 975
 976         batadv_hardif_free_ref(primary_if);
 977
 978         if (!bat_priv->bat_algo_ops->bat_orig_print) {
 979                 seq_puts(seq,
 980                          "No printing function for this routing protocol\n");
 981                 return 0;
 982         }
 983
 984         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq,
 985                                                BATADV_IF_DEFAULT);
 986
 987         return 0;
 988 }
 989
 990 /**
 991  * batadv_orig_hardif_seq_print_text - writes originator infos for a specific
 992  *  outgoing interface
 993  * @seq: debugfs table seq_file struct
 994  * @offset: not used
 995  *
 996  * Returns 0
 997  */
 998 int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset)
 999 {
1000         struct net_device *net_dev = (struct net_device *)seq->private;
1001         struct batadv_hard_iface *hard_iface;
1002         struct batadv_priv *bat_priv;
1003
1004         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1005
1006         if (!hard_iface || !hard_iface->soft_iface) {
1007                 seq_puts(seq, "Interface not known to B.A.T.M.A.N.\n");
1008                 goto out;
1009         }
1010
1011         bat_priv = netdev_priv(hard_iface->soft_iface);
1012         if (!bat_priv->bat_algo_ops->bat_orig_print) {
1013                 seq_puts(seq,
1014                          "No printing function for this routing protocol\n");
1015                 goto out;
1016         }
1017
1018         if (hard_iface->if_status != BATADV_IF_ACTIVE) {
1019                 seq_puts(seq, "Interface not active\n");
1020                 goto out;
1021         }
1022
1023         seq_printf(seq, "[B.A.T.M.A.N. adv %s, IF/MAC: %s/%pM (%s %s)]\n",
1024                    BATADV_SOURCE_VERSION, hard_iface->net_dev->name,
1025                    hard_iface->net_dev->dev_addr,
1026                    hard_iface->soft_iface->name, bat_priv->bat_algo_ops->name);
1027
1028         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, hard_iface);
1029
1030 out:
1031         batadv_hardif_free_ref(hard_iface);
1032         return 0;
1033 }
1034
1035 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
1036                             int max_if_num)
1037 {
1038         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
1039         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1040         struct batadv_hashtable *hash = bat_priv->orig_hash;
1041         struct hlist_head *head;
1042         struct batadv_orig_node *orig_node;
1043         uint32_t i;
1044         int ret;
1045
1046         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1047          * if_num
1048          */
1049         for (i = 0; i < hash->size; i++) {
1050                 head = &hash->table[i];
1051
1052                 rcu_read_lock();
1053                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1054                         ret = 0;
1055                         if (bao->bat_orig_add_if)
1056                                 ret = bao->bat_orig_add_if(orig_node,
1057                                                            max_if_num);
1058                         if (ret == -ENOMEM)
1059                                 goto err;
1060                 }
1061                 rcu_read_unlock();
1062         }
1063
1064         return 0;
1065
1066 err:
1067         rcu_read_unlock();
1068         return -ENOMEM;
1069 }
1070
1071 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
1072                             int max_if_num)
1073 {
1074         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
1075         struct batadv_hashtable *hash = bat_priv->orig_hash;
1076         struct hlist_head *head;
1077         struct batadv_hard_iface *hard_iface_tmp;
1078         struct batadv_orig_node *orig_node;
1079         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1080         uint32_t i;
1081         int ret;
1082
1083         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1084          * if_num
1085          */
1086         for (i = 0; i < hash->size; i++) {
1087                 head = &hash->table[i];
1088
1089                 rcu_read_lock();
1090                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1091                         ret = 0;
1092                         if (bao->bat_orig_del_if)
1093                                 ret = bao->bat_orig_del_if(orig_node,
1094                                                            max_if_num,
1095                                                            hard_iface->if_num);
1096                         if (ret == -ENOMEM)
1097                                 goto err;
1098                 }
1099                 rcu_read_unlock();
1100         }
1101
1102         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
1103         rcu_read_lock();
1104         list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) {
1105                 if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE)
1106                         continue;
1107
1108                 if (hard_iface == hard_iface_tmp)
1109                         continue;
1110
1111                 if (hard_iface->soft_iface != hard_iface_tmp->soft_iface)
1112                         continue;
1113
1114                 if (hard_iface_tmp->if_num > hard_iface->if_num)
1115                         hard_iface_tmp->if_num--;
1116         }
1117         rcu_read_unlock();
1118
1119         hard_iface->if_num = -1;
1120         return 0;
1121
1122 err:
1123         rcu_read_unlock();
1124         return -ENOMEM;
1125 }