net/batman-adv/originator.c

   1 /* Copyright (C) 2009-2015 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "originator.h"
  19 #include "main.h"
  20
  21 #include <linux/errno.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/fs.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/kernel.h>
  26 #include <linux/list.h>
  27 #include <linux/lockdep.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/rculist.h>
  30 #include <linux/seq_file.h>
  31 #include <linux/slab.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/workqueue.h>
  34
  35 #include "distributed-arp-table.h"
  36 #include "fragmentation.h"
  37 #include "gateway_client.h"
  38 #include "hard-interface.h"
  39 #include "hash.h"
  40 #include "multicast.h"
  41 #include "network-coding.h"
  42 #include "routing.h"
  43 #include "translation-table.h"
  44
  45 /* hash class keys */
  46 static struct lock_class_key batadv_orig_hash_lock_class_key;
  47
  48 static void batadv_purge_orig(struct work_struct *work);
  49
  50 /* returns 1 if they are the same originator */
  51 int batadv_compare_orig(const struct hlist_node *node, const void *data2)
  52 {
  53         const void *data1 = container_of(node, struct batadv_orig_node,
  54                                          hash_entry);
  55
  56         return batadv_compare_eth(data1, data2);
  57 }
  58
  59 /**
  60  * batadv_orig_node_vlan_get - get an orig_node_vlan object
  61  * @orig_node: the originator serving the VLAN
  62  * @vid: the VLAN identifier
  63  *
  64  * Returns the vlan object identified by vid and belonging to orig_node or NULL
  65  * if it does not exist.
  66  */
  67 struct batadv_orig_node_vlan *
  68 batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
  69                           unsigned short vid)
  70 {
  71         struct batadv_orig_node_vlan *vlan = NULL, *tmp;
  72
  73         rcu_read_lock();
  74         hlist_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) {
  75                 if (tmp->vid != vid)
  76                         continue;
  77
  78                 if (!atomic_inc_not_zero(&tmp->refcount))
  79                         continue;
  80
  81                 vlan = tmp;
  82
  83                 break;
  84         }
  85         rcu_read_unlock();
  86
  87         return vlan;
  88 }
  89
  90 /**
  91  * batadv_orig_node_vlan_new - search and possibly create an orig_node_vlan
  92  *  object
  93  * @orig_node: the originator serving the VLAN
  94  * @vid: the VLAN identifier
  95  *
  96  * Returns NULL in case of failure or the vlan object identified by vid and
  97  * belonging to orig_node otherwise. The object is created and added to the list
  98  * if it does not exist.
  99  *
 100  * The object is returned with refcounter increased by 1.
 101  */
 102 struct batadv_orig_node_vlan *
 103 batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
 104                           unsigned short vid)
 105 {
 106         struct batadv_orig_node_vlan *vlan;
 107
 108         spin_lock_bh(&orig_node->vlan_list_lock);
 109
 110         /* first look if an object for this vid already exists */
 111         vlan = batadv_orig_node_vlan_get(orig_node, vid);
 112         if (vlan)
 113                 goto out;
 114
 115         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 116         if (!vlan)
 117                 goto out;
 118
 119         atomic_set(&vlan->refcount, 2);
 120         vlan->vid = vid;
 121
 122         hlist_add_head_rcu(&vlan->list, &orig_node->vlan_list);
 123
 124 out:
 125         spin_unlock_bh(&orig_node->vlan_list_lock);
 126
 127         return vlan;
 128 }
 129
 130 /**
 131  * batadv_orig_node_vlan_free_ref - decrement the refcounter and possibly free
 132  *  the originator-vlan object
 133  * @orig_vlan: the originator-vlan object to release
 134  */
 135 void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan)
 136 {
 137         if (atomic_dec_and_test(&orig_vlan->refcount))
 138                 kfree_rcu(orig_vlan, rcu);
 139 }
 140
 141 int batadv_originator_init(struct batadv_priv *bat_priv)
 142 {
 143         if (bat_priv->orig_hash)
 144                 return 0;
 145
 146         bat_priv->orig_hash = batadv_hash_new(1024);
 147
 148         if (!bat_priv->orig_hash)
 149                 goto err;
 150
 151         batadv_hash_set_lock_class(bat_priv->orig_hash,
 152                                    &batadv_orig_hash_lock_class_key);
 153
 154         INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig);
 155         queue_delayed_work(batadv_event_workqueue,
 156                            &bat_priv->orig_work,
 157                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 158
 159         return 0;
 160
 161 err:
 162         return -ENOMEM;
 163 }
 164
 165 /**
 166  * batadv_neigh_ifinfo_release - release neigh_ifinfo from lists and queue for
 167  *  free after rcu grace period
 168  * @neigh_ifinfo: the neigh_ifinfo object to release
 169  */
 170 static void
 171 batadv_neigh_ifinfo_release(struct batadv_neigh_ifinfo *neigh_ifinfo)
 172 {
 173         if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 174                 batadv_hardif_free_ref(neigh_ifinfo->if_outgoing);
 175
 176         kfree_rcu(neigh_ifinfo, rcu);
 177 }
 178
 179 /**
 180  * batadv_neigh_ifinfo_free_ref - decrement the refcounter and possibly release
 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                 batadv_neigh_ifinfo_release(neigh_ifinfo);
 188 }
 189
 190 /**
 191  * batadv_neigh_node_free_rcu - free the neigh_node
 192  * batadv_neigh_node_release - release neigh_node from lists and queue for
 193  *  free after rcu grace period
 194  * @neigh_node: neigh neighbor to free
 195  */
 196 static void batadv_neigh_node_release(struct batadv_neigh_node *neigh_node)
 197 {
 198         struct hlist_node *node_tmp;
 199         struct batadv_neigh_ifinfo *neigh_ifinfo;
 200
 201         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
 202                                   &neigh_node->ifinfo_list, list) {
 203                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
 204         }
 205
 206         batadv_hardif_free_ref(neigh_node->if_incoming);
 207
 208         kfree_rcu(neigh_node, rcu);
 209 }
 210
 211 /**
 212  * batadv_neigh_node_free_ref - decrement the neighbors refcounter
 213  *  and possibly release it
 214  * @neigh_node: neigh neighbor to free
 215  */
 216 void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node)
 217 {
 218         if (atomic_dec_and_test(&neigh_node->refcount))
 219                 batadv_neigh_node_release(neigh_node);
 220 }
 221
 222 /**
 223  * batadv_orig_node_get_router - router to the originator depending on iface
 224  * @orig_node: the orig node for the router
 225  * @if_outgoing: the interface where the payload packet has been received or
 226  *  the OGM should be sent to
 227  *
 228  * Returns the neighbor which should be router for this orig_node/iface.
 229  *
 230  * The object is returned with refcounter increased by 1.
 231  */
 232 struct batadv_neigh_node *
 233 batadv_orig_router_get(struct batadv_orig_node *orig_node,
 234                        const struct batadv_hard_iface *if_outgoing)
 235 {
 236         struct batadv_orig_ifinfo *orig_ifinfo;
 237         struct batadv_neigh_node *router = NULL;
 238
 239         rcu_read_lock();
 240         hlist_for_each_entry_rcu(orig_ifinfo, &orig_node->ifinfo_list, list) {
 241                 if (orig_ifinfo->if_outgoing != if_outgoing)
 242                         continue;
 243
 244                 router = rcu_dereference(orig_ifinfo->router);
 245                 break;
 246         }
 247
 248         if (router && !atomic_inc_not_zero(&router->refcount))
 249                 router = NULL;
 250
 251         rcu_read_unlock();
 252         return router;
 253 }
 254
 255 /**
 256  * batadv_orig_ifinfo_get - find the ifinfo from an orig_node
 257  * @orig_node: the orig node to be queried
 258  * @if_outgoing: the interface for which the ifinfo should be acquired
 259  *
 260  * Returns the requested orig_ifinfo or NULL if not found.
 261  *
 262  * The object is returned with refcounter increased by 1.
 263  */
 264 struct batadv_orig_ifinfo *
 265 batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node,
 266                        struct batadv_hard_iface *if_outgoing)
 267 {
 268         struct batadv_orig_ifinfo *tmp, *orig_ifinfo = NULL;
 269
 270         rcu_read_lock();
 271         hlist_for_each_entry_rcu(tmp, &orig_node->ifinfo_list,
 272                                  list) {
 273                 if (tmp->if_outgoing != if_outgoing)
 274                         continue;
 275
 276                 if (!atomic_inc_not_zero(&tmp->refcount))
 277                         continue;
 278
 279                 orig_ifinfo = tmp;
 280                 break;
 281         }
 282         rcu_read_unlock();
 283
 284         return orig_ifinfo;
 285 }
 286
 287 /**
 288  * batadv_orig_ifinfo_new - search and possibly create an orig_ifinfo object
 289  * @orig_node: the orig node to be queried
 290  * @if_outgoing: the interface for which the ifinfo should be acquired
 291  *
 292  * Returns NULL in case of failure or the orig_ifinfo object for the if_outgoing
 293  * interface otherwise. The object is created and added to the list
 294  * if it does not exist.
 295  *
 296  * The object is returned with refcounter increased by 1.
 297  */
 298 struct batadv_orig_ifinfo *
 299 batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node,
 300                        struct batadv_hard_iface *if_outgoing)
 301 {
 302         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
 303         unsigned long reset_time;
 304
 305         spin_lock_bh(&orig_node->neigh_list_lock);
 306
 307         orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing);
 308         if (orig_ifinfo)
 309                 goto out;
 310
 311         orig_ifinfo = kzalloc(sizeof(*orig_ifinfo), GFP_ATOMIC);
 312         if (!orig_ifinfo)
 313                 goto out;
 314
 315         if (if_outgoing != BATADV_IF_DEFAULT &&
 316             !atomic_inc_not_zero(&if_outgoing->refcount)) {
 317                 kfree(orig_ifinfo);
 318                 orig_ifinfo = NULL;
 319                 goto out;
 320         }
 321
 322         reset_time = jiffies - 1;
 323         reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 324         orig_ifinfo->batman_seqno_reset = reset_time;
 325         orig_ifinfo->if_outgoing = if_outgoing;
 326         INIT_HLIST_NODE(&orig_ifinfo->list);
 327         atomic_set(&orig_ifinfo->refcount, 2);
 328         hlist_add_head_rcu(&orig_ifinfo->list,
 329                            &orig_node->ifinfo_list);
 330 out:
 331         spin_unlock_bh(&orig_node->neigh_list_lock);
 332         return orig_ifinfo;
 333 }
 334
 335 /**
 336  * batadv_neigh_ifinfo_get - find the ifinfo from an neigh_node
 337  * @neigh_node: the neigh node to be queried
 338  * @if_outgoing: the interface for which the ifinfo should be acquired
 339  *
 340  * The object is returned with refcounter increased by 1.
 341  *
 342  * Returns the requested neigh_ifinfo or NULL if not found
 343  */
 344 struct batadv_neigh_ifinfo *
 345 batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh,
 346                         struct batadv_hard_iface *if_outgoing)
 347 {
 348         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL,
 349                                    *tmp_neigh_ifinfo;
 350
 351         rcu_read_lock();
 352         hlist_for_each_entry_rcu(tmp_neigh_ifinfo, &neigh->ifinfo_list,
 353                                  list) {
 354                 if (tmp_neigh_ifinfo->if_outgoing != if_outgoing)
 355                         continue;
 356
 357                 if (!atomic_inc_not_zero(&tmp_neigh_ifinfo->refcount))
 358                         continue;
 359
 360                 neigh_ifinfo = tmp_neigh_ifinfo;
 361                 break;
 362         }
 363         rcu_read_unlock();
 364
 365         return neigh_ifinfo;
 366 }
 367
 368 /**
 369  * batadv_neigh_ifinfo_new - search and possibly create an neigh_ifinfo object
 370  * @neigh_node: the neigh node to be queried
 371  * @if_outgoing: the interface for which the ifinfo should be acquired
 372  *
 373  * Returns NULL in case of failure or the neigh_ifinfo object for the
 374  * if_outgoing interface otherwise. The object is created and added to the list
 375  * if it does not exist.
 376  *
 377  * The object is returned with refcounter increased by 1.
 378  */
 379 struct batadv_neigh_ifinfo *
 380 batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh,
 381                         struct batadv_hard_iface *if_outgoing)
 382 {
 383         struct batadv_neigh_ifinfo *neigh_ifinfo;
 384
 385         spin_lock_bh(&neigh->ifinfo_lock);
 386
 387         neigh_ifinfo = batadv_neigh_ifinfo_get(neigh, if_outgoing);
 388         if (neigh_ifinfo)
 389                 goto out;
 390
 391         neigh_ifinfo = kzalloc(sizeof(*neigh_ifinfo), GFP_ATOMIC);
 392         if (!neigh_ifinfo)
 393                 goto out;
 394
 395         if (if_outgoing && !atomic_inc_not_zero(&if_outgoing->refcount)) {
 396                 kfree(neigh_ifinfo);
 397                 neigh_ifinfo = NULL;
 398                 goto out;
 399         }
 400
 401         INIT_HLIST_NODE(&neigh_ifinfo->list);
 402         atomic_set(&neigh_ifinfo->refcount, 2);
 403         neigh_ifinfo->if_outgoing = if_outgoing;
 404
 405         hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list);
 406
 407 out:
 408         spin_unlock_bh(&neigh->ifinfo_lock);
 409
 410         return neigh_ifinfo;
 411 }
 412
 413 /**
 414  * batadv_neigh_node_get - retrieve a neighbour from the list
 415  * @orig_node: originator which the neighbour belongs to
 416  * @hard_iface: the interface where this neighbour is connected to
 417  * @addr: the address of the neighbour
 418  *
 419  * Looks for and possibly returns a neighbour belonging to this originator list
 420  * which is connected through the provided hard interface.
 421  * Returns NULL if the neighbour is not found.
 422  */
 423 static struct batadv_neigh_node *
 424 batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
 425                       const struct batadv_hard_iface *hard_iface,
 426                       const u8 *addr)
 427 {
 428         struct batadv_neigh_node *tmp_neigh_node, *res = NULL;
 429
 430         rcu_read_lock();
 431         hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) {
 432                 if (!batadv_compare_eth(tmp_neigh_node->addr, addr))
 433                         continue;
 434
 435                 if (tmp_neigh_node->if_incoming != hard_iface)
 436                         continue;
 437
 438                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 439                         continue;
 440
 441                 res = tmp_neigh_node;
 442                 break;
 443         }
 444         rcu_read_unlock();
 445
 446         return res;
 447 }
 448
 449 /**
 450  * batadv_neigh_node_new - create and init a new neigh_node object
 451  * @orig_node: originator object representing the neighbour
 452  * @hard_iface: the interface where the neighbour is connected to
 453  * @neigh_addr: the mac address of the neighbour interface
 454  *
 455  * Allocates a new neigh_node object and initialises all the generic fields.
 456  * Returns the new object or NULL on failure.
 457  */
 458 struct batadv_neigh_node *
 459 batadv_neigh_node_new(struct batadv_orig_node *orig_node,
 460                       struct batadv_hard_iface *hard_iface,
 461                       const u8 *neigh_addr)
 462 {
 463         struct batadv_neigh_node *neigh_node;
 464
 465         spin_lock_bh(&orig_node->neigh_list_lock);
 466
 467         neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr);
 468         if (neigh_node)
 469                 goto out;
 470
 471         neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
 472         if (!neigh_node)
 473                 goto out;
 474
 475         if (!atomic_inc_not_zero(&hard_iface->refcount)) {
 476                 kfree(neigh_node);
 477                 neigh_node = NULL;
 478                 goto out;
 479         }
 480
 481         INIT_HLIST_NODE(&neigh_node->list);
 482         INIT_HLIST_HEAD(&neigh_node->ifinfo_list);
 483         spin_lock_init(&neigh_node->ifinfo_lock);
 484
 485         ether_addr_copy(neigh_node->addr, neigh_addr);
 486         neigh_node->if_incoming = hard_iface;
 487         neigh_node->orig_node = orig_node;
 488         neigh_node->last_seen = jiffies;
 489
 490         /* extra reference for return */
 491         atomic_set(&neigh_node->refcount, 2);
 492
 493         hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
 494
 495         batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv,
 496                    "Creating new neighbor %pM for orig_node %pM on interface %s\n",
 497                    neigh_addr, orig_node->orig, hard_iface->net_dev->name);
 498
 499 out:
 500         spin_unlock_bh(&orig_node->neigh_list_lock);
 501
 502         return neigh_node;
 503 }
 504
 505 /**
 506  * batadv_orig_ifinfo_release - release orig_ifinfo from lists and queue for
 507  *  free after rcu grace period
 508  * @orig_ifinfo: the orig_ifinfo object to release
 509  */
 510 static void batadv_orig_ifinfo_release(struct batadv_orig_ifinfo *orig_ifinfo)
 511 {
 512         struct batadv_neigh_node *router;
 513
 514         if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 515                 batadv_hardif_free_ref(orig_ifinfo->if_outgoing);
 516
 517         /* this is the last reference to this object */
 518         router = rcu_dereference_protected(orig_ifinfo->router, true);
 519         if (router)
 520                 batadv_neigh_node_free_ref(router);
 521
 522         kfree_rcu(orig_ifinfo, rcu);
 523 }
 524
 525 /**
 526  * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly release
 527  *  the orig_ifinfo
 528  * @orig_ifinfo: the orig_ifinfo object to release
 529  */
 530 void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo)
 531 {
 532         if (atomic_dec_and_test(&orig_ifinfo->refcount))
 533                 batadv_orig_ifinfo_release(orig_ifinfo);
 534 }
 535
 536 /**
 537  * batadv_orig_node_free_rcu - free the orig_node
 538  * @rcu: rcu pointer of the orig_node
 539  */
 540 static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 541 {
 542         struct batadv_orig_node *orig_node;
 543
 544         orig_node = container_of(rcu, struct batadv_orig_node, rcu);
 545
 546         batadv_mcast_purge_orig(orig_node);
 547
 548         batadv_frag_purge_orig(orig_node, NULL);
 549
 550         if (orig_node->bat_priv->bat_algo_ops->bat_orig_free)
 551                 orig_node->bat_priv->bat_algo_ops->bat_orig_free(orig_node);
 552
 553         kfree(orig_node->tt_buff);
 554         kfree(orig_node);
 555 }
 556
 557 /**
 558  * batadv_orig_node_release - release orig_node from lists and queue for
 559  *  free after rcu grace period
 560  * @orig_node: the orig node to free
 561  */
 562 static void batadv_orig_node_release(struct batadv_orig_node *orig_node)
 563 {
 564         struct hlist_node *node_tmp;
 565         struct batadv_neigh_node *neigh_node;
 566         struct batadv_orig_ifinfo *orig_ifinfo;
 567         struct batadv_orig_node_vlan *vlan;
 568         struct batadv_orig_ifinfo *last_candidate;
 569
 570         spin_lock_bh(&orig_node->neigh_list_lock);
 571
 572         /* for all neighbors towards this originator ... */
 573         hlist_for_each_entry_safe(neigh_node, node_tmp,
 574                                   &orig_node->neigh_list, list) {
 575                 hlist_del_rcu(&neigh_node->list);
 576                 batadv_neigh_node_free_ref(neigh_node);
 577         }
 578
 579         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 580                                   &orig_node->ifinfo_list, list) {
 581                 hlist_del_rcu(&orig_ifinfo->list);
 582                 batadv_orig_ifinfo_free_ref(orig_ifinfo);
 583         }
 584
 585         last_candidate = orig_node->last_bonding_candidate;
 586         orig_node->last_bonding_candidate = NULL;
 587         spin_unlock_bh(&orig_node->neigh_list_lock);
 588
 589         if (last_candidate)
 590                 batadv_orig_ifinfo_free_ref(last_candidate);
 591
 592         spin_lock_bh(&orig_node->vlan_list_lock);
 593         hlist_for_each_entry_safe(vlan, node_tmp, &orig_node->vlan_list, list) {
 594                 hlist_del_rcu(&vlan->list);
 595                 batadv_orig_node_vlan_free_ref(vlan);
 596         }
 597         spin_unlock_bh(&orig_node->vlan_list_lock);
 598
 599         /* Free nc_nodes */
 600         batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 601
 602         call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
 603 }
 604
 605 /**
 606  * batadv_orig_node_free_ref - decrement the orig node refcounter and possibly
 607  *  release it
 608  * @orig_node: the orig node to free
 609  */
 610 void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
 611 {
 612         if (atomic_dec_and_test(&orig_node->refcount))
 613                 batadv_orig_node_release(orig_node);
 614 }
 615
 616 void batadv_originator_free(struct batadv_priv *bat_priv)
 617 {
 618         struct batadv_hashtable *hash = bat_priv->orig_hash;
 619         struct hlist_node *node_tmp;
 620         struct hlist_head *head;
 621         spinlock_t *list_lock; /* spinlock to protect write access */
 622         struct batadv_orig_node *orig_node;
 623         u32 i;
 624
 625         if (!hash)
 626                 return;
 627
 628         cancel_delayed_work_sync(&bat_priv->orig_work);
 629
 630         bat_priv->orig_hash = NULL;
 631
 632         for (i = 0; i < hash->size; i++) {
 633                 head = &hash->table[i];
 634                 list_lock = &hash->list_locks[i];
 635
 636                 spin_lock_bh(list_lock);
 637                 hlist_for_each_entry_safe(orig_node, node_tmp,
 638                                           head, hash_entry) {
 639                         hlist_del_rcu(&orig_node->hash_entry);
 640                         batadv_orig_node_free_ref(orig_node);
 641                 }
 642                 spin_unlock_bh(list_lock);
 643         }
 644
 645         batadv_hash_destroy(hash);
 646 }
 647
 648 /**
 649  * batadv_orig_node_new - creates a new orig_node
 650  * @bat_priv: the bat priv with all the soft interface information
 651  * @addr: the mac address of the originator
 652  *
 653  * Creates a new originator object and initialise all the generic fields.
 654  * The new object is not added to the originator list.
 655  * Returns the newly created object or NULL on failure.
 656  */
 657 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
 658                                               const u8 *addr)
 659 {
 660         struct batadv_orig_node *orig_node;
 661         struct batadv_orig_node_vlan *vlan;
 662         unsigned long reset_time;
 663         int i;
 664
 665         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 666                    "Creating new originator: %pM\n", addr);
 667
 668         orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
 669         if (!orig_node)
 670                 return NULL;
 671
 672         INIT_HLIST_HEAD(&orig_node->neigh_list);
 673         INIT_HLIST_HEAD(&orig_node->vlan_list);
 674         INIT_HLIST_HEAD(&orig_node->ifinfo_list);
 675         spin_lock_init(&orig_node->bcast_seqno_lock);
 676         spin_lock_init(&orig_node->neigh_list_lock);
 677         spin_lock_init(&orig_node->tt_buff_lock);
 678         spin_lock_init(&orig_node->tt_lock);
 679         spin_lock_init(&orig_node->vlan_list_lock);
 680
 681         batadv_nc_init_orig(orig_node);
 682
 683         /* extra reference for return */
 684         atomic_set(&orig_node->refcount, 2);
 685
 686         orig_node->bat_priv = bat_priv;
 687         ether_addr_copy(orig_node->orig, addr);
 688         batadv_dat_init_orig_node_addr(orig_node);
 689         atomic_set(&orig_node->last_ttvn, 0);
 690         orig_node->tt_buff = NULL;
 691         orig_node->tt_buff_len = 0;
 692         orig_node->last_seen = jiffies;
 693         reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 694         orig_node->bcast_seqno_reset = reset_time;
 695
 696 #ifdef CONFIG_BATMAN_ADV_MCAST
 697         orig_node->mcast_flags = BATADV_NO_FLAGS;
 698         INIT_HLIST_NODE(&orig_node->mcast_want_all_unsnoopables_node);
 699         INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv4_node);
 700         INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv6_node);
 701         spin_lock_init(&orig_node->mcast_handler_lock);
 702 #endif
 703
 704         /* create a vlan object for the "untagged" LAN */
 705         vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);
 706         if (!vlan)
 707                 goto free_orig_node;
 708         /* batadv_orig_node_vlan_new() increases the refcounter.
 709          * Immediately release vlan since it is not needed anymore in this
 710          * context
 711          */
 712         batadv_orig_node_vlan_free_ref(vlan);
 713
 714         for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
 715                 INIT_HLIST_HEAD(&orig_node->fragments[i].head);
 716                 spin_lock_init(&orig_node->fragments[i].lock);
 717                 orig_node->fragments[i].size = 0;
 718         }
 719
 720         return orig_node;
 721 free_orig_node:
 722         kfree(orig_node);
 723         return NULL;
 724 }
 725
 726 /**
 727  * batadv_purge_neigh_ifinfo - purge obsolete ifinfo entries from neighbor
 728  * @bat_priv: the bat priv with all the soft interface information
 729  * @neigh: orig node which is to be checked
 730  */
 731 static void
 732 batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv,
 733                           struct batadv_neigh_node *neigh)
 734 {
 735         struct batadv_neigh_ifinfo *neigh_ifinfo;
 736         struct batadv_hard_iface *if_outgoing;
 737         struct hlist_node *node_tmp;
 738
 739         spin_lock_bh(&neigh->ifinfo_lock);
 740
 741         /* for all ifinfo objects for this neighinator */
 742         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
 743                                   &neigh->ifinfo_list, list) {
 744                 if_outgoing = neigh_ifinfo->if_outgoing;
 745
 746                 /* always keep the default interface */
 747                 if (if_outgoing == BATADV_IF_DEFAULT)
 748                         continue;
 749
 750                 /* don't purge if the interface is not (going) down */
 751                 if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
 752                     (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
 753                     (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
 754                         continue;
 755
 756                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 757                            "neighbor/ifinfo purge: neighbor %pM, iface: %s\n",
 758                            neigh->addr, if_outgoing->net_dev->name);
 759
 760                 hlist_del_rcu(&neigh_ifinfo->list);
 761                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
 762         }
 763
 764         spin_unlock_bh(&neigh->ifinfo_lock);
 765 }
 766
 767 /**
 768  * batadv_purge_orig_ifinfo - purge obsolete ifinfo entries from originator
 769  * @bat_priv: the bat priv with all the soft interface information
 770  * @orig_node: orig node which is to be checked
 771  *
 772  * Returns true if any ifinfo entry was purged, false otherwise.
 773  */
 774 static bool
 775 batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv,
 776                          struct batadv_orig_node *orig_node)
 777 {
 778         struct batadv_orig_ifinfo *orig_ifinfo;
 779         struct batadv_hard_iface *if_outgoing;
 780         struct hlist_node *node_tmp;
 781         bool ifinfo_purged = false;
 782
 783         spin_lock_bh(&orig_node->neigh_list_lock);
 784
 785         /* for all ifinfo objects for this originator */
 786         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 787                                   &orig_node->ifinfo_list, list) {
 788                 if_outgoing = orig_ifinfo->if_outgoing;
 789
 790                 /* always keep the default interface */
 791                 if (if_outgoing == BATADV_IF_DEFAULT)
 792                         continue;
 793
 794                 /* don't purge if the interface is not (going) down */
 795                 if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
 796                     (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
 797                     (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
 798                         continue;
 799
 800                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 801                            "router/ifinfo purge: originator %pM, iface: %s\n",
 802                            orig_node->orig, if_outgoing->net_dev->name);
 803
 804                 ifinfo_purged = true;
 805
 806                 hlist_del_rcu(&orig_ifinfo->list);
 807                 batadv_orig_ifinfo_free_ref(orig_ifinfo);
 808                 if (orig_node->last_bonding_candidate == orig_ifinfo) {
 809                         orig_node->last_bonding_candidate = NULL;
 810                         batadv_orig_ifinfo_free_ref(orig_ifinfo);
 811                 }
 812         }
 813
 814         spin_unlock_bh(&orig_node->neigh_list_lock);
 815
 816         return ifinfo_purged;
 817 }
 818
 819 /**
 820  * batadv_purge_orig_neighbors - purges neighbors from originator
 821  * @bat_priv: the bat priv with all the soft interface information
 822  * @orig_node: orig node which is to be checked
 823  *
 824  * Returns true if any neighbor was purged, false otherwise
 825  */
 826 static bool
 827 batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
 828                             struct batadv_orig_node *orig_node)
 829 {
 830         struct hlist_node *node_tmp;
 831         struct batadv_neigh_node *neigh_node;
 832         bool neigh_purged = false;
 833         unsigned long last_seen;
 834         struct batadv_hard_iface *if_incoming;
 835
 836         spin_lock_bh(&orig_node->neigh_list_lock);
 837
 838         /* for all neighbors towards this originator ... */
 839         hlist_for_each_entry_safe(neigh_node, node_tmp,
 840                                   &orig_node->neigh_list, list) {
 841                 last_seen = neigh_node->last_seen;
 842                 if_incoming = neigh_node->if_incoming;
 843
 844                 if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) ||
 845                     (if_incoming->if_status == BATADV_IF_INACTIVE) ||
 846                     (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 847                     (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) {
 848                         if ((if_incoming->if_status == BATADV_IF_INACTIVE) ||
 849                             (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 850                             (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED))
 851                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 852                                            "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
 853                                            orig_node->orig, neigh_node->addr,
 854                                            if_incoming->net_dev->name);
 855                         else
 856                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 857                                            "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
 858                                            orig_node->orig, neigh_node->addr,
 859                                            jiffies_to_msecs(last_seen));
 860
 861                         neigh_purged = true;
 862
 863                         hlist_del_rcu(&neigh_node->list);
 864                         batadv_neigh_node_free_ref(neigh_node);
 865                 } else {
 866                         /* only necessary if not the whole neighbor is to be
 867                          * deleted, but some interface has been removed.
 868                          */
 869                         batadv_purge_neigh_ifinfo(bat_priv, neigh_node);
 870                 }
 871         }
 872
 873         spin_unlock_bh(&orig_node->neigh_list_lock);
 874         return neigh_purged;
 875 }
 876
 877 /**
 878  * batadv_find_best_neighbor - finds the best neighbor after purging
 879  * @bat_priv: the bat priv with all the soft interface information
 880  * @orig_node: orig node which is to be checked
 881  * @if_outgoing: the interface for which the metric should be compared
 882  *
 883  * Returns the current best neighbor, with refcount increased.
 884  */
 885 static struct batadv_neigh_node *
 886 batadv_find_best_neighbor(struct batadv_priv *bat_priv,
 887                           struct batadv_orig_node *orig_node,
 888                           struct batadv_hard_iface *if_outgoing)
 889 {
 890         struct batadv_neigh_node *best = NULL, *neigh;
 891         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
 892
 893         rcu_read_lock();
 894         hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) {
 895                 if (best && (bao->bat_neigh_cmp(neigh, if_outgoing,
 896                                                 best, if_outgoing) <= 0))
 897                         continue;
 898
 899                 if (!atomic_inc_not_zero(&neigh->refcount))
 900                         continue;
 901
 902                 if (best)
 903                         batadv_neigh_node_free_ref(best);
 904
 905                 best = neigh;
 906         }
 907         rcu_read_unlock();
 908
 909         return best;
 910 }
 911
 912 /**
 913  * batadv_purge_orig_node - purges obsolete information from an orig_node
 914  * @bat_priv: the bat priv with all the soft interface information
 915  * @orig_node: orig node which is to be checked
 916  *
 917  * This function checks if the orig_node or substructures of it have become
 918  * obsolete, and purges this information if that's the case.
 919  *
 920  * Returns true if the orig_node is to be removed, false otherwise.
 921  */
 922 static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
 923                                    struct batadv_orig_node *orig_node)
 924 {
 925         struct batadv_neigh_node *best_neigh_node;
 926         struct batadv_hard_iface *hard_iface;
 927         bool changed_ifinfo, changed_neigh;
 928
 929         if (batadv_has_timed_out(orig_node->last_seen,
 930                                  2 * BATADV_PURGE_TIMEOUT)) {
 931                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 932                            "Originator timeout: originator %pM, last_seen %u\n",
 933                            orig_node->orig,
 934                            jiffies_to_msecs(orig_node->last_seen));
 935                 return true;
 936         }
 937         changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node);
 938         changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node);
 939
 940         if (!changed_ifinfo && !changed_neigh)
 941                 return false;
 942
 943         /* first for NULL ... */
 944         best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node,
 945                                                     BATADV_IF_DEFAULT);
 946         batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT,
 947                             best_neigh_node);
 948         if (best_neigh_node)
 949                 batadv_neigh_node_free_ref(best_neigh_node);
 950
 951         /* ... then for all other interfaces. */
 952         rcu_read_lock();
 953         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 954                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
 955                         continue;
 956
 957                 if (hard_iface->soft_iface != bat_priv->soft_iface)
 958                         continue;
 959
 960                 best_neigh_node = batadv_find_best_neighbor(bat_priv,
 961                                                             orig_node,
 962                                                             hard_iface);
 963                 batadv_update_route(bat_priv, orig_node, hard_iface,
 964                                     best_neigh_node);
 965                 if (best_neigh_node)
 966                         batadv_neigh_node_free_ref(best_neigh_node);
 967         }
 968         rcu_read_unlock();
 969
 970         return false;
 971 }
 972
 973 static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 974 {
 975         struct batadv_hashtable *hash = bat_priv->orig_hash;
 976         struct hlist_node *node_tmp;
 977         struct hlist_head *head;
 978         spinlock_t *list_lock; /* spinlock to protect write access */
 979         struct batadv_orig_node *orig_node;
 980         u32 i;
 981
 982         if (!hash)
 983                 return;
 984
 985         /* for all origins... */
 986         for (i = 0; i < hash->size; i++) {
 987                 head = &hash->table[i];
 988                 list_lock = &hash->list_locks[i];
 989
 990                 spin_lock_bh(list_lock);
 991                 hlist_for_each_entry_safe(orig_node, node_tmp,
 992                                           head, hash_entry) {
 993                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
 994                                 batadv_gw_node_delete(bat_priv, orig_node);
 995                                 hlist_del_rcu(&orig_node->hash_entry);
 996                                 batadv_tt_global_del_orig(orig_node->bat_priv,
 997                                                           orig_node, -1,
 998                                                           "originator timed out");
 999                                 batadv_orig_node_free_ref(orig_node);
1000                                 continue;
1001                         }
1002
1003                         batadv_frag_purge_orig(orig_node,
1004                                                batadv_frag_check_entry);
1005                 }
1006                 spin_unlock_bh(list_lock);
1007         }
1008
1009         batadv_gw_election(bat_priv);
1010 }
1011
1012 static void batadv_purge_orig(struct work_struct *work)
1013 {
1014         struct delayed_work *delayed_work;
1015         struct batadv_priv *bat_priv;
1016
1017         delayed_work = container_of(work, struct delayed_work, work);
1018         bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
1019         _batadv_purge_orig(bat_priv);
1020         queue_delayed_work(batadv_event_workqueue,
1021                            &bat_priv->orig_work,
1022                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
1023 }
1024
1025 void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
1026 {
1027         _batadv_purge_orig(bat_priv);
1028 }
1029
1030 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
1031 {
1032         struct net_device *net_dev = (struct net_device *)seq->private;
1033         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1034         struct batadv_hard_iface *primary_if;
1035
1036         primary_if = batadv_seq_print_text_primary_if_get(seq);
1037         if (!primary_if)
1038                 return 0;
1039
1040         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
1041                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
1042                    primary_if->net_dev->dev_addr, net_dev->name,
1043                    bat_priv->bat_algo_ops->name);
1044
1045         batadv_hardif_free_ref(primary_if);
1046
1047         if (!bat_priv->bat_algo_ops->bat_orig_print) {
1048                 seq_puts(seq,
1049                          "No printing function for this routing protocol\n");
1050                 return 0;
1051         }
1052
1053         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq,
1054                                                BATADV_IF_DEFAULT);
1055
1056         return 0;
1057 }
1058
1059 /**
1060  * batadv_orig_hardif_seq_print_text - writes originator infos for a specific
1061  *  outgoing interface
1062  * @seq: debugfs table seq_file struct
1063  * @offset: not used
1064  *
1065  * Returns 0
1066  */
1067 int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset)
1068 {
1069         struct net_device *net_dev = (struct net_device *)seq->private;
1070         struct batadv_hard_iface *hard_iface;
1071         struct batadv_priv *bat_priv;
1072
1073         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1074
1075         if (!hard_iface || !hard_iface->soft_iface) {
1076                 seq_puts(seq, "Interface not known to B.A.T.M.A.N.\n");
1077                 goto out;
1078         }
1079
1080         bat_priv = netdev_priv(hard_iface->soft_iface);
1081         if (!bat_priv->bat_algo_ops->bat_orig_print) {
1082                 seq_puts(seq,
1083                          "No printing function for this routing protocol\n");
1084                 goto out;
1085         }
1086
1087         if (hard_iface->if_status != BATADV_IF_ACTIVE) {
1088                 seq_puts(seq, "Interface not active\n");
1089                 goto out;
1090         }
1091
1092         seq_printf(seq, "[B.A.T.M.A.N. adv %s, IF/MAC: %s/%pM (%s %s)]\n",
1093                    BATADV_SOURCE_VERSION, hard_iface->net_dev->name,
1094                    hard_iface->net_dev->dev_addr,
1095                    hard_iface->soft_iface->name, bat_priv->bat_algo_ops->name);
1096
1097         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, hard_iface);
1098
1099 out:
1100         if (hard_iface)
1101                 batadv_hardif_free_ref(hard_iface);
1102         return 0;
1103 }
1104
1105 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
1106                             unsigned int max_if_num)
1107 {
1108         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
1109         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1110         struct batadv_hashtable *hash = bat_priv->orig_hash;
1111         struct hlist_head *head;
1112         struct batadv_orig_node *orig_node;
1113         u32 i;
1114         int ret;
1115
1116         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1117          * if_num
1118          */
1119         for (i = 0; i < hash->size; i++) {
1120                 head = &hash->table[i];
1121
1122                 rcu_read_lock();
1123                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1124                         ret = 0;
1125                         if (bao->bat_orig_add_if)
1126                                 ret = bao->bat_orig_add_if(orig_node,
1127                                                            max_if_num);
1128                         if (ret == -ENOMEM)
1129                                 goto err;
1130                 }
1131                 rcu_read_unlock();
1132         }
1133
1134         return 0;
1135
1136 err:
1137         rcu_read_unlock();
1138         return -ENOMEM;
1139 }
1140
1141 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
1142                             unsigned int max_if_num)
1143 {
1144         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
1145         struct batadv_hashtable *hash = bat_priv->orig_hash;
1146         struct hlist_head *head;
1147         struct batadv_hard_iface *hard_iface_tmp;
1148         struct batadv_orig_node *orig_node;
1149         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1150         u32 i;
1151         int ret;
1152
1153         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1154          * if_num
1155          */
1156         for (i = 0; i < hash->size; i++) {
1157                 head = &hash->table[i];
1158
1159                 rcu_read_lock();
1160                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1161                         ret = 0;
1162                         if (bao->bat_orig_del_if)
1163                                 ret = bao->bat_orig_del_if(orig_node,
1164                                                            max_if_num,
1165                                                            hard_iface->if_num);
1166                         if (ret == -ENOMEM)
1167                                 goto err;
1168                 }
1169                 rcu_read_unlock();
1170         }
1171
1172         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
1173         rcu_read_lock();
1174         list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) {
1175                 if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE)
1176                         continue;
1177
1178                 if (hard_iface == hard_iface_tmp)
1179                         continue;
1180
1181                 if (hard_iface->soft_iface != hard_iface_tmp->soft_iface)
1182                         continue;
1183
1184                 if (hard_iface_tmp->if_num > hard_iface->if_num)
1185                         hard_iface_tmp->if_num--;
1186         }
1187         rcu_read_unlock();
1188
1189         hard_iface->if_num = -1;
1190         return 0;
1191
1192 err:
1193         rcu_read_unlock();
1194         return -ENOMEM;
1195 }