net/batman-adv/originator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  */
   6
   7 #include "originator.h"
   8 #include "main.h"
   9
  10 #include <linux/atomic.h>
  11 #include <linux/errno.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/gfp.h>
  14 #include <linux/jiffies.h>
  15 #include <linux/kernel.h>
  16 #include <linux/kref.h>
  17 #include <linux/list.h>
  18 #include <linux/lockdep.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/netlink.h>
  21 #include <linux/rculist.h>
  22 #include <linux/rcupdate.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/slab.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/stddef.h>
  27 #include <linux/workqueue.h>
  28 #include <net/sock.h>
  29 #include <uapi/linux/batadv_packet.h>
  30 #include <uapi/linux/batman_adv.h>
  31
  32 #include "bat_algo.h"
  33 #include "distributed-arp-table.h"
  34 #include "fragmentation.h"
  35 #include "gateway_client.h"
  36 #include "hard-interface.h"
  37 #include "hash.h"
  38 #include "log.h"
  39 #include "multicast.h"
  40 #include "netlink.h"
  41 #include "network-coding.h"
  42 #include "routing.h"
  43 #include "soft-interface.h"
  44 #include "translation-table.h"
  45
  46 /* hash class keys */
  47 static struct lock_class_key batadv_orig_hash_lock_class_key;
  48
  49 /**
  50  * batadv_orig_hash_find() - Find and return originator from orig_hash
  51  * @bat_priv: the bat priv with all the soft interface information
  52  * @data: mac address of the originator
  53  *
  54  * Return: orig_node (with increased refcnt), NULL on errors
  55  */
  56 struct batadv_orig_node *
  57 batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data)
  58 {
  59         struct batadv_hashtable *hash = bat_priv->orig_hash;
  60         struct hlist_head *head;
  61         struct batadv_orig_node *orig_node, *orig_node_tmp = NULL;
  62         int index;
  63
  64         if (!hash)
  65                 return NULL;
  66
  67         index = batadv_choose_orig(data, hash->size);
  68         head = &hash->table[index];
  69
  70         rcu_read_lock();
  71         hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
  72                 if (!batadv_compare_eth(orig_node, data))
  73                         continue;
  74
  75                 if (!kref_get_unless_zero(&orig_node->refcount))
  76                         continue;
  77
  78                 orig_node_tmp = orig_node;
  79                 break;
  80         }
  81         rcu_read_unlock();
  82
  83         return orig_node_tmp;
  84 }
  85
  86 static void batadv_purge_orig(struct work_struct *work);
  87
  88 /**
  89  * batadv_compare_orig() - comparing function used in the originator hash table
  90  * @node: node in the local table
  91  * @data2: second object to compare the node to
  92  *
  93  * Return: true if they are the same originator
  94  */
  95 bool batadv_compare_orig(const struct hlist_node *node, const void *data2)
  96 {
  97         const void *data1 = container_of(node, struct batadv_orig_node,
  98                                          hash_entry);
  99
 100         return batadv_compare_eth(data1, data2);
 101 }
 102
 103 /**
 104  * batadv_orig_node_vlan_get() - get an orig_node_vlan object
 105  * @orig_node: the originator serving the VLAN
 106  * @vid: the VLAN identifier
 107  *
 108  * Return: the vlan object identified by vid and belonging to orig_node or NULL
 109  * if it does not exist.
 110  */
 111 struct batadv_orig_node_vlan *
 112 batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
 113                           unsigned short vid)
 114 {
 115         struct batadv_orig_node_vlan *vlan = NULL, *tmp;
 116
 117         rcu_read_lock();
 118         hlist_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) {
 119                 if (tmp->vid != vid)
 120                         continue;
 121
 122                 if (!kref_get_unless_zero(&tmp->refcount))
 123                         continue;
 124
 125                 vlan = tmp;
 126
 127                 break;
 128         }
 129         rcu_read_unlock();
 130
 131         return vlan;
 132 }
 133
 134 /**
 135  * batadv_orig_node_vlan_new() - search and possibly create an orig_node_vlan
 136  *  object
 137  * @orig_node: the originator serving the VLAN
 138  * @vid: the VLAN identifier
 139  *
 140  * Return: NULL in case of failure or the vlan object identified by vid and
 141  * belonging to orig_node otherwise. The object is created and added to the list
 142  * if it does not exist.
 143  *
 144  * The object is returned with refcounter increased by 1.
 145  */
 146 struct batadv_orig_node_vlan *
 147 batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
 148                           unsigned short vid)
 149 {
 150         struct batadv_orig_node_vlan *vlan;
 151
 152         spin_lock_bh(&orig_node->vlan_list_lock);
 153
 154         /* first look if an object for this vid already exists */
 155         vlan = batadv_orig_node_vlan_get(orig_node, vid);
 156         if (vlan)
 157                 goto out;
 158
 159         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 160         if (!vlan)
 161                 goto out;
 162
 163         kref_init(&vlan->refcount);
 164         vlan->vid = vid;
 165
 166         kref_get(&vlan->refcount);
 167         hlist_add_head_rcu(&vlan->list, &orig_node->vlan_list);
 168
 169 out:
 170         spin_unlock_bh(&orig_node->vlan_list_lock);
 171
 172         return vlan;
 173 }
 174
 175 /**
 176  * batadv_orig_node_vlan_release() - release originator-vlan object from lists
 177  *  and queue for free after rcu grace period
 178  * @ref: kref pointer of the originator-vlan object
 179  */
 180 void batadv_orig_node_vlan_release(struct kref *ref)
 181 {
 182         struct batadv_orig_node_vlan *orig_vlan;
 183
 184         orig_vlan = container_of(ref, struct batadv_orig_node_vlan, refcount);
 185
 186         kfree_rcu(orig_vlan, rcu);
 187 }
 188
 189 /**
 190  * batadv_originator_init() - Initialize all originator structures
 191  * @bat_priv: the bat priv with all the soft interface information
 192  *
 193  * Return: 0 on success or negative error number in case of failure
 194  */
 195 int batadv_originator_init(struct batadv_priv *bat_priv)
 196 {
 197         if (bat_priv->orig_hash)
 198                 return 0;
 199
 200         bat_priv->orig_hash = batadv_hash_new(1024);
 201
 202         if (!bat_priv->orig_hash)
 203                 goto err;
 204
 205         batadv_hash_set_lock_class(bat_priv->orig_hash,
 206                                    &batadv_orig_hash_lock_class_key);
 207
 208         INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig);
 209         queue_delayed_work(batadv_event_workqueue,
 210                            &bat_priv->orig_work,
 211                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 212
 213         return 0;
 214
 215 err:
 216         return -ENOMEM;
 217 }
 218
 219 /**
 220  * batadv_neigh_ifinfo_release() - release neigh_ifinfo from lists and queue for
 221  *  free after rcu grace period
 222  * @ref: kref pointer of the neigh_ifinfo
 223  */
 224 void batadv_neigh_ifinfo_release(struct kref *ref)
 225 {
 226         struct batadv_neigh_ifinfo *neigh_ifinfo;
 227
 228         neigh_ifinfo = container_of(ref, struct batadv_neigh_ifinfo, refcount);
 229
 230         if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 231                 batadv_hardif_put(neigh_ifinfo->if_outgoing);
 232
 233         kfree_rcu(neigh_ifinfo, rcu);
 234 }
 235
 236 /**
 237  * batadv_hardif_neigh_release() - release hardif neigh node from lists and
 238  *  queue for free after rcu grace period
 239  * @ref: kref pointer of the neigh_node
 240  */
 241 void batadv_hardif_neigh_release(struct kref *ref)
 242 {
 243         struct batadv_hardif_neigh_node *hardif_neigh;
 244
 245         hardif_neigh = container_of(ref, struct batadv_hardif_neigh_node,
 246                                     refcount);
 247
 248         spin_lock_bh(&hardif_neigh->if_incoming->neigh_list_lock);
 249         hlist_del_init_rcu(&hardif_neigh->list);
 250         spin_unlock_bh(&hardif_neigh->if_incoming->neigh_list_lock);
 251
 252         batadv_hardif_put(hardif_neigh->if_incoming);
 253         kfree_rcu(hardif_neigh, rcu);
 254 }
 255
 256 /**
 257  * batadv_neigh_node_release() - release neigh_node from lists and queue for
 258  *  free after rcu grace period
 259  * @ref: kref pointer of the neigh_node
 260  */
 261 void batadv_neigh_node_release(struct kref *ref)
 262 {
 263         struct hlist_node *node_tmp;
 264         struct batadv_neigh_node *neigh_node;
 265         struct batadv_neigh_ifinfo *neigh_ifinfo;
 266
 267         neigh_node = container_of(ref, struct batadv_neigh_node, refcount);
 268
 269         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
 270                                   &neigh_node->ifinfo_list, list) {
 271                 batadv_neigh_ifinfo_put(neigh_ifinfo);
 272         }
 273
 274         batadv_hardif_neigh_put(neigh_node->hardif_neigh);
 275
 276         batadv_hardif_put(neigh_node->if_incoming);
 277
 278         kfree_rcu(neigh_node, rcu);
 279 }
 280
 281 /**
 282  * batadv_orig_router_get() - router to the originator depending on iface
 283  * @orig_node: the orig node for the router
 284  * @if_outgoing: the interface where the payload packet has been received or
 285  *  the OGM should be sent to
 286  *
 287  * Return: the neighbor which should be the router for this orig_node/iface.
 288  *
 289  * The object is returned with refcounter increased by 1.
 290  */
 291 struct batadv_neigh_node *
 292 batadv_orig_router_get(struct batadv_orig_node *orig_node,
 293                        const struct batadv_hard_iface *if_outgoing)
 294 {
 295         struct batadv_orig_ifinfo *orig_ifinfo;
 296         struct batadv_neigh_node *router = NULL;
 297
 298         rcu_read_lock();
 299         hlist_for_each_entry_rcu(orig_ifinfo, &orig_node->ifinfo_list, list) {
 300                 if (orig_ifinfo->if_outgoing != if_outgoing)
 301                         continue;
 302
 303                 router = rcu_dereference(orig_ifinfo->router);
 304                 break;
 305         }
 306
 307         if (router && !kref_get_unless_zero(&router->refcount))
 308                 router = NULL;
 309
 310         rcu_read_unlock();
 311         return router;
 312 }
 313
 314 /**
 315  * batadv_orig_ifinfo_get() - find the ifinfo from an orig_node
 316  * @orig_node: the orig node to be queried
 317  * @if_outgoing: the interface for which the ifinfo should be acquired
 318  *
 319  * Return: the requested orig_ifinfo or NULL if not found.
 320  *
 321  * The object is returned with refcounter increased by 1.
 322  */
 323 struct batadv_orig_ifinfo *
 324 batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node,
 325                        struct batadv_hard_iface *if_outgoing)
 326 {
 327         struct batadv_orig_ifinfo *tmp, *orig_ifinfo = NULL;
 328
 329         rcu_read_lock();
 330         hlist_for_each_entry_rcu(tmp, &orig_node->ifinfo_list,
 331                                  list) {
 332                 if (tmp->if_outgoing != if_outgoing)
 333                         continue;
 334
 335                 if (!kref_get_unless_zero(&tmp->refcount))
 336                         continue;
 337
 338                 orig_ifinfo = tmp;
 339                 break;
 340         }
 341         rcu_read_unlock();
 342
 343         return orig_ifinfo;
 344 }
 345
 346 /**
 347  * batadv_orig_ifinfo_new() - search and possibly create an orig_ifinfo object
 348  * @orig_node: the orig node to be queried
 349  * @if_outgoing: the interface for which the ifinfo should be acquired
 350  *
 351  * Return: NULL in case of failure or the orig_ifinfo object for the if_outgoing
 352  * interface otherwise. The object is created and added to the list
 353  * if it does not exist.
 354  *
 355  * The object is returned with refcounter increased by 1.
 356  */
 357 struct batadv_orig_ifinfo *
 358 batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node,
 359                        struct batadv_hard_iface *if_outgoing)
 360 {
 361         struct batadv_orig_ifinfo *orig_ifinfo;
 362         unsigned long reset_time;
 363
 364         spin_lock_bh(&orig_node->neigh_list_lock);
 365
 366         orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing);
 367         if (orig_ifinfo)
 368                 goto out;
 369
 370         orig_ifinfo = kzalloc(sizeof(*orig_ifinfo), GFP_ATOMIC);
 371         if (!orig_ifinfo)
 372                 goto out;
 373
 374         if (if_outgoing != BATADV_IF_DEFAULT)
 375                 kref_get(&if_outgoing->refcount);
 376
 377         reset_time = jiffies - 1;
 378         reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 379         orig_ifinfo->batman_seqno_reset = reset_time;
 380         orig_ifinfo->if_outgoing = if_outgoing;
 381         INIT_HLIST_NODE(&orig_ifinfo->list);
 382         kref_init(&orig_ifinfo->refcount);
 383
 384         kref_get(&orig_ifinfo->refcount);
 385         hlist_add_head_rcu(&orig_ifinfo->list,
 386                            &orig_node->ifinfo_list);
 387 out:
 388         spin_unlock_bh(&orig_node->neigh_list_lock);
 389         return orig_ifinfo;
 390 }
 391
 392 /**
 393  * batadv_neigh_ifinfo_get() - find the ifinfo from an neigh_node
 394  * @neigh: the neigh node to be queried
 395  * @if_outgoing: the interface for which the ifinfo should be acquired
 396  *
 397  * The object is returned with refcounter increased by 1.
 398  *
 399  * Return: the requested neigh_ifinfo or NULL if not found
 400  */
 401 struct batadv_neigh_ifinfo *
 402 batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh,
 403                         struct batadv_hard_iface *if_outgoing)
 404 {
 405         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL,
 406                                    *tmp_neigh_ifinfo;
 407
 408         rcu_read_lock();
 409         hlist_for_each_entry_rcu(tmp_neigh_ifinfo, &neigh->ifinfo_list,
 410                                  list) {
 411                 if (tmp_neigh_ifinfo->if_outgoing != if_outgoing)
 412                         continue;
 413
 414                 if (!kref_get_unless_zero(&tmp_neigh_ifinfo->refcount))
 415                         continue;
 416
 417                 neigh_ifinfo = tmp_neigh_ifinfo;
 418                 break;
 419         }
 420         rcu_read_unlock();
 421
 422         return neigh_ifinfo;
 423 }
 424
 425 /**
 426  * batadv_neigh_ifinfo_new() - search and possibly create an neigh_ifinfo object
 427  * @neigh: the neigh node to be queried
 428  * @if_outgoing: the interface for which the ifinfo should be acquired
 429  *
 430  * Return: NULL in case of failure or the neigh_ifinfo object for the
 431  * if_outgoing interface otherwise. The object is created and added to the list
 432  * if it does not exist.
 433  *
 434  * The object is returned with refcounter increased by 1.
 435  */
 436 struct batadv_neigh_ifinfo *
 437 batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh,
 438                         struct batadv_hard_iface *if_outgoing)
 439 {
 440         struct batadv_neigh_ifinfo *neigh_ifinfo;
 441
 442         spin_lock_bh(&neigh->ifinfo_lock);
 443
 444         neigh_ifinfo = batadv_neigh_ifinfo_get(neigh, if_outgoing);
 445         if (neigh_ifinfo)
 446                 goto out;
 447
 448         neigh_ifinfo = kzalloc(sizeof(*neigh_ifinfo), GFP_ATOMIC);
 449         if (!neigh_ifinfo)
 450                 goto out;
 451
 452         if (if_outgoing)
 453                 kref_get(&if_outgoing->refcount);
 454
 455         INIT_HLIST_NODE(&neigh_ifinfo->list);
 456         kref_init(&neigh_ifinfo->refcount);
 457         neigh_ifinfo->if_outgoing = if_outgoing;
 458
 459         kref_get(&neigh_ifinfo->refcount);
 460         hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list);
 461
 462 out:
 463         spin_unlock_bh(&neigh->ifinfo_lock);
 464
 465         return neigh_ifinfo;
 466 }
 467
 468 /**
 469  * batadv_neigh_node_get() - retrieve a neighbour from the list
 470  * @orig_node: originator which the neighbour belongs to
 471  * @hard_iface: the interface where this neighbour is connected to
 472  * @addr: the address of the neighbour
 473  *
 474  * Looks for and possibly returns a neighbour belonging to this originator list
 475  * which is connected through the provided hard interface.
 476  *
 477  * Return: neighbor when found. Otherwise NULL
 478  */
 479 static struct batadv_neigh_node *
 480 batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
 481                       const struct batadv_hard_iface *hard_iface,
 482                       const u8 *addr)
 483 {
 484         struct batadv_neigh_node *tmp_neigh_node, *res = NULL;
 485
 486         rcu_read_lock();
 487         hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) {
 488                 if (!batadv_compare_eth(tmp_neigh_node->addr, addr))
 489                         continue;
 490
 491                 if (tmp_neigh_node->if_incoming != hard_iface)
 492                         continue;
 493
 494                 if (!kref_get_unless_zero(&tmp_neigh_node->refcount))
 495                         continue;
 496
 497                 res = tmp_neigh_node;
 498                 break;
 499         }
 500         rcu_read_unlock();
 501
 502         return res;
 503 }
 504
 505 /**
 506  * batadv_hardif_neigh_create() - create a hardif neighbour node
 507  * @hard_iface: the interface this neighbour is connected to
 508  * @neigh_addr: the interface address of the neighbour to retrieve
 509  * @orig_node: originator object representing the neighbour
 510  *
 511  * Return: the hardif neighbour node if found or created or NULL otherwise.
 512  */
 513 static struct batadv_hardif_neigh_node *
 514 batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface,
 515                            const u8 *neigh_addr,
 516                            struct batadv_orig_node *orig_node)
 517 {
 518         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 519         struct batadv_hardif_neigh_node *hardif_neigh;
 520
 521         spin_lock_bh(&hard_iface->neigh_list_lock);
 522
 523         /* check if neighbor hasn't been added in the meantime */
 524         hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr);
 525         if (hardif_neigh)
 526                 goto out;
 527
 528         hardif_neigh = kzalloc(sizeof(*hardif_neigh), GFP_ATOMIC);
 529         if (!hardif_neigh)
 530                 goto out;
 531
 532         kref_get(&hard_iface->refcount);
 533         INIT_HLIST_NODE(&hardif_neigh->list);
 534         ether_addr_copy(hardif_neigh->addr, neigh_addr);
 535         ether_addr_copy(hardif_neigh->orig, orig_node->orig);
 536         hardif_neigh->if_incoming = hard_iface;
 537         hardif_neigh->last_seen = jiffies;
 538
 539         kref_init(&hardif_neigh->refcount);
 540
 541         if (bat_priv->algo_ops->neigh.hardif_init)
 542                 bat_priv->algo_ops->neigh.hardif_init(hardif_neigh);
 543
 544         hlist_add_head_rcu(&hardif_neigh->list, &hard_iface->neigh_list);
 545
 546 out:
 547         spin_unlock_bh(&hard_iface->neigh_list_lock);
 548         return hardif_neigh;
 549 }
 550
 551 /**
 552  * batadv_hardif_neigh_get_or_create() - retrieve or create a hardif neighbour
 553  *  node
 554  * @hard_iface: the interface this neighbour is connected to
 555  * @neigh_addr: the interface address of the neighbour to retrieve
 556  * @orig_node: originator object representing the neighbour
 557  *
 558  * Return: the hardif neighbour node if found or created or NULL otherwise.
 559  */
 560 static struct batadv_hardif_neigh_node *
 561 batadv_hardif_neigh_get_or_create(struct batadv_hard_iface *hard_iface,
 562                                   const u8 *neigh_addr,
 563                                   struct batadv_orig_node *orig_node)
 564 {
 565         struct batadv_hardif_neigh_node *hardif_neigh;
 566
 567         /* first check without locking to avoid the overhead */
 568         hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr);
 569         if (hardif_neigh)
 570                 return hardif_neigh;
 571
 572         return batadv_hardif_neigh_create(hard_iface, neigh_addr, orig_node);
 573 }
 574
 575 /**
 576  * batadv_hardif_neigh_get() - retrieve a hardif neighbour from the list
 577  * @hard_iface: the interface where this neighbour is connected to
 578  * @neigh_addr: the address of the neighbour
 579  *
 580  * Looks for and possibly returns a neighbour belonging to this hard interface.
 581  *
 582  * Return: neighbor when found. Otherwise NULL
 583  */
 584 struct batadv_hardif_neigh_node *
 585 batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface,
 586                         const u8 *neigh_addr)
 587 {
 588         struct batadv_hardif_neigh_node *tmp_hardif_neigh, *hardif_neigh = NULL;
 589
 590         rcu_read_lock();
 591         hlist_for_each_entry_rcu(tmp_hardif_neigh,
 592                                  &hard_iface->neigh_list, list) {
 593                 if (!batadv_compare_eth(tmp_hardif_neigh->addr, neigh_addr))
 594                         continue;
 595
 596                 if (!kref_get_unless_zero(&tmp_hardif_neigh->refcount))
 597                         continue;
 598
 599                 hardif_neigh = tmp_hardif_neigh;
 600                 break;
 601         }
 602         rcu_read_unlock();
 603
 604         return hardif_neigh;
 605 }
 606
 607 /**
 608  * batadv_neigh_node_create() - create a neigh node object
 609  * @orig_node: originator object representing the neighbour
 610  * @hard_iface: the interface where the neighbour is connected to
 611  * @neigh_addr: the mac address of the neighbour interface
 612  *
 613  * Allocates a new neigh_node object and initialises all the generic fields.
 614  *
 615  * Return: the neighbour node if found or created or NULL otherwise.
 616  */
 617 static struct batadv_neigh_node *
 618 batadv_neigh_node_create(struct batadv_orig_node *orig_node,
 619                          struct batadv_hard_iface *hard_iface,
 620                          const u8 *neigh_addr)
 621 {
 622         struct batadv_neigh_node *neigh_node;
 623         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
 624
 625         spin_lock_bh(&orig_node->neigh_list_lock);
 626
 627         neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr);
 628         if (neigh_node)
 629                 goto out;
 630
 631         hardif_neigh = batadv_hardif_neigh_get_or_create(hard_iface,
 632                                                          neigh_addr, orig_node);
 633         if (!hardif_neigh)
 634                 goto out;
 635
 636         neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
 637         if (!neigh_node)
 638                 goto out;
 639
 640         INIT_HLIST_NODE(&neigh_node->list);
 641         INIT_HLIST_HEAD(&neigh_node->ifinfo_list);
 642         spin_lock_init(&neigh_node->ifinfo_lock);
 643
 644         kref_get(&hard_iface->refcount);
 645         ether_addr_copy(neigh_node->addr, neigh_addr);
 646         neigh_node->if_incoming = hard_iface;
 647         neigh_node->orig_node = orig_node;
 648         neigh_node->last_seen = jiffies;
 649
 650         /* increment unique neighbor refcount */
 651         kref_get(&hardif_neigh->refcount);
 652         neigh_node->hardif_neigh = hardif_neigh;
 653
 654         /* extra reference for return */
 655         kref_init(&neigh_node->refcount);
 656
 657         kref_get(&neigh_node->refcount);
 658         hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
 659
 660         batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv,
 661                    "Creating new neighbor %pM for orig_node %pM on interface %s\n",
 662                    neigh_addr, orig_node->orig, hard_iface->net_dev->name);
 663
 664 out:
 665         spin_unlock_bh(&orig_node->neigh_list_lock);
 666
 667         batadv_hardif_neigh_put(hardif_neigh);
 668         return neigh_node;
 669 }
 670
 671 /**
 672  * batadv_neigh_node_get_or_create() - retrieve or create a neigh node object
 673  * @orig_node: originator object representing the neighbour
 674  * @hard_iface: the interface where the neighbour is connected to
 675  * @neigh_addr: the mac address of the neighbour interface
 676  *
 677  * Return: the neighbour node if found or created or NULL otherwise.
 678  */
 679 struct batadv_neigh_node *
 680 batadv_neigh_node_get_or_create(struct batadv_orig_node *orig_node,
 681                                 struct batadv_hard_iface *hard_iface,
 682                                 const u8 *neigh_addr)
 683 {
 684         struct batadv_neigh_node *neigh_node;
 685
 686         /* first check without locking to avoid the overhead */
 687         neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr);
 688         if (neigh_node)
 689                 return neigh_node;
 690
 691         return batadv_neigh_node_create(orig_node, hard_iface, neigh_addr);
 692 }
 693
 694 /**
 695  * batadv_hardif_neigh_dump() - Dump to netlink the neighbor infos for a
 696  *  specific outgoing interface
 697  * @msg: message to dump into
 698  * @cb: parameters for the dump
 699  *
 700  * Return: 0 or error value
 701  */
 702 int batadv_hardif_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb)
 703 {
 704         struct net *net = sock_net(cb->skb->sk);
 705         struct net_device *soft_iface;
 706         struct net_device *hard_iface = NULL;
 707         struct batadv_hard_iface *hardif = BATADV_IF_DEFAULT;
 708         struct batadv_priv *bat_priv;
 709         struct batadv_hard_iface *primary_if = NULL;
 710         int ret;
 711         int ifindex, hard_ifindex;
 712
 713         ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
 714         if (!ifindex)
 715                 return -EINVAL;
 716
 717         soft_iface = dev_get_by_index(net, ifindex);
 718         if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
 719                 ret = -ENODEV;
 720                 goto out;
 721         }
 722
 723         bat_priv = netdev_priv(soft_iface);
 724
 725         primary_if = batadv_primary_if_get_selected(bat_priv);
 726         if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
 727                 ret = -ENOENT;
 728                 goto out;
 729         }
 730
 731         hard_ifindex = batadv_netlink_get_ifindex(cb->nlh,
 732                                                   BATADV_ATTR_HARD_IFINDEX);
 733         if (hard_ifindex) {
 734                 hard_iface = dev_get_by_index(net, hard_ifindex);
 735                 if (hard_iface)
 736                         hardif = batadv_hardif_get_by_netdev(hard_iface);
 737
 738                 if (!hardif) {
 739                         ret = -ENODEV;
 740                         goto out;
 741                 }
 742
 743                 if (hardif->soft_iface != soft_iface) {
 744                         ret = -ENOENT;
 745                         goto out;
 746                 }
 747         }
 748
 749         if (!bat_priv->algo_ops->neigh.dump) {
 750                 ret = -EOPNOTSUPP;
 751                 goto out;
 752         }
 753
 754         bat_priv->algo_ops->neigh.dump(msg, cb, bat_priv, hardif);
 755
 756         ret = msg->len;
 757
 758  out:
 759         batadv_hardif_put(hardif);
 760         dev_put(hard_iface);
 761         batadv_hardif_put(primary_if);
 762         dev_put(soft_iface);
 763
 764         return ret;
 765 }
 766
 767 /**
 768  * batadv_orig_ifinfo_release() - release orig_ifinfo from lists and queue for
 769  *  free after rcu grace period
 770  * @ref: kref pointer of the orig_ifinfo
 771  */
 772 void batadv_orig_ifinfo_release(struct kref *ref)
 773 {
 774         struct batadv_orig_ifinfo *orig_ifinfo;
 775         struct batadv_neigh_node *router;
 776
 777         orig_ifinfo = container_of(ref, struct batadv_orig_ifinfo, refcount);
 778
 779         if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 780                 batadv_hardif_put(orig_ifinfo->if_outgoing);
 781
 782         /* this is the last reference to this object */
 783         router = rcu_dereference_protected(orig_ifinfo->router, true);
 784         batadv_neigh_node_put(router);
 785
 786         kfree_rcu(orig_ifinfo, rcu);
 787 }
 788
 789 /**
 790  * batadv_orig_node_free_rcu() - free the orig_node
 791  * @rcu: rcu pointer of the orig_node
 792  */
 793 static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 794 {
 795         struct batadv_orig_node *orig_node;
 796
 797         orig_node = container_of(rcu, struct batadv_orig_node, rcu);
 798
 799         batadv_mcast_purge_orig(orig_node);
 800
 801         batadv_frag_purge_orig(orig_node, NULL);
 802
 803         kfree(orig_node->tt_buff);
 804         kfree(orig_node);
 805 }
 806
 807 /**
 808  * batadv_orig_node_release() - release orig_node from lists and queue for
 809  *  free after rcu grace period
 810  * @ref: kref pointer of the orig_node
 811  */
 812 void batadv_orig_node_release(struct kref *ref)
 813 {
 814         struct hlist_node *node_tmp;
 815         struct batadv_neigh_node *neigh_node;
 816         struct batadv_orig_node *orig_node;
 817         struct batadv_orig_ifinfo *orig_ifinfo;
 818         struct batadv_orig_node_vlan *vlan;
 819         struct batadv_orig_ifinfo *last_candidate;
 820
 821         orig_node = container_of(ref, struct batadv_orig_node, refcount);
 822
 823         spin_lock_bh(&orig_node->neigh_list_lock);
 824
 825         /* for all neighbors towards this originator ... */
 826         hlist_for_each_entry_safe(neigh_node, node_tmp,
 827                                   &orig_node->neigh_list, list) {
 828                 hlist_del_rcu(&neigh_node->list);
 829                 batadv_neigh_node_put(neigh_node);
 830         }
 831
 832         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 833                                   &orig_node->ifinfo_list, list) {
 834                 hlist_del_rcu(&orig_ifinfo->list);
 835                 batadv_orig_ifinfo_put(orig_ifinfo);
 836         }
 837
 838         last_candidate = orig_node->last_bonding_candidate;
 839         orig_node->last_bonding_candidate = NULL;
 840         spin_unlock_bh(&orig_node->neigh_list_lock);
 841
 842         batadv_orig_ifinfo_put(last_candidate);
 843
 844         spin_lock_bh(&orig_node->vlan_list_lock);
 845         hlist_for_each_entry_safe(vlan, node_tmp, &orig_node->vlan_list, list) {
 846                 hlist_del_rcu(&vlan->list);
 847                 batadv_orig_node_vlan_put(vlan);
 848         }
 849         spin_unlock_bh(&orig_node->vlan_list_lock);
 850
 851         /* Free nc_nodes */
 852         batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 853
 854         call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
 855 }
 856
 857 /**
 858  * batadv_originator_free() - Free all originator structures
 859  * @bat_priv: the bat priv with all the soft interface information
 860  */
 861 void batadv_originator_free(struct batadv_priv *bat_priv)
 862 {
 863         struct batadv_hashtable *hash = bat_priv->orig_hash;
 864         struct hlist_node *node_tmp;
 865         struct hlist_head *head;
 866         spinlock_t *list_lock; /* spinlock to protect write access */
 867         struct batadv_orig_node *orig_node;
 868         u32 i;
 869
 870         if (!hash)
 871                 return;
 872
 873         cancel_delayed_work_sync(&bat_priv->orig_work);
 874
 875         bat_priv->orig_hash = NULL;
 876
 877         for (i = 0; i < hash->size; i++) {
 878                 head = &hash->table[i];
 879                 list_lock = &hash->list_locks[i];
 880
 881                 spin_lock_bh(list_lock);
 882                 hlist_for_each_entry_safe(orig_node, node_tmp,
 883                                           head, hash_entry) {
 884                         hlist_del_rcu(&orig_node->hash_entry);
 885                         batadv_orig_node_put(orig_node);
 886                 }
 887                 spin_unlock_bh(list_lock);
 888         }
 889
 890         batadv_hash_destroy(hash);
 891 }
 892
 893 /**
 894  * batadv_orig_node_new() - creates a new orig_node
 895  * @bat_priv: the bat priv with all the soft interface information
 896  * @addr: the mac address of the originator
 897  *
 898  * Creates a new originator object and initialises all the generic fields.
 899  * The new object is not added to the originator list.
 900  *
 901  * Return: the newly created object or NULL on failure.
 902  */
 903 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
 904                                               const u8 *addr)
 905 {
 906         struct batadv_orig_node *orig_node;
 907         struct batadv_orig_node_vlan *vlan;
 908         unsigned long reset_time;
 909         int i;
 910
 911         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 912                    "Creating new originator: %pM\n", addr);
 913
 914         orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
 915         if (!orig_node)
 916                 return NULL;
 917
 918         INIT_HLIST_HEAD(&orig_node->neigh_list);
 919         INIT_HLIST_HEAD(&orig_node->vlan_list);
 920         INIT_HLIST_HEAD(&orig_node->ifinfo_list);
 921         spin_lock_init(&orig_node->bcast_seqno_lock);
 922         spin_lock_init(&orig_node->neigh_list_lock);
 923         spin_lock_init(&orig_node->tt_buff_lock);
 924         spin_lock_init(&orig_node->tt_lock);
 925         spin_lock_init(&orig_node->vlan_list_lock);
 926
 927         batadv_nc_init_orig(orig_node);
 928
 929         /* extra reference for return */
 930         kref_init(&orig_node->refcount);
 931
 932         orig_node->bat_priv = bat_priv;
 933         ether_addr_copy(orig_node->orig, addr);
 934         batadv_dat_init_orig_node_addr(orig_node);
 935         atomic_set(&orig_node->last_ttvn, 0);
 936         orig_node->tt_buff = NULL;
 937         orig_node->tt_buff_len = 0;
 938         orig_node->last_seen = jiffies;
 939         reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 940         orig_node->bcast_seqno_reset = reset_time;
 941
 942 #ifdef CONFIG_BATMAN_ADV_MCAST
 943         orig_node->mcast_flags = BATADV_MCAST_WANT_NO_RTR4;
 944         orig_node->mcast_flags |= BATADV_MCAST_WANT_NO_RTR6;
 945         INIT_HLIST_NODE(&orig_node->mcast_want_all_unsnoopables_node);
 946         INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv4_node);
 947         INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv6_node);
 948         spin_lock_init(&orig_node->mcast_handler_lock);
 949 #endif
 950
 951         /* create a vlan object for the "untagged" LAN */
 952         vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);
 953         if (!vlan)
 954                 goto free_orig_node;
 955         /* batadv_orig_node_vlan_new() increases the refcounter.
 956          * Immediately release vlan since it is not needed anymore in this
 957          * context
 958          */
 959         batadv_orig_node_vlan_put(vlan);
 960
 961         for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
 962                 INIT_HLIST_HEAD(&orig_node->fragments[i].fragment_list);
 963                 spin_lock_init(&orig_node->fragments[i].lock);
 964                 orig_node->fragments[i].size = 0;
 965         }
 966
 967         return orig_node;
 968 free_orig_node:
 969         kfree(orig_node);
 970         return NULL;
 971 }
 972
 973 /**
 974  * batadv_purge_neigh_ifinfo() - purge obsolete ifinfo entries from neighbor
 975  * @bat_priv: the bat priv with all the soft interface information
 976  * @neigh: orig node which is to be checked
 977  */
 978 static void
 979 batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv,
 980                           struct batadv_neigh_node *neigh)
 981 {
 982         struct batadv_neigh_ifinfo *neigh_ifinfo;
 983         struct batadv_hard_iface *if_outgoing;
 984         struct hlist_node *node_tmp;
 985
 986         spin_lock_bh(&neigh->ifinfo_lock);
 987
 988         /* for all ifinfo objects for this neighinator */
 989         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
 990                                   &neigh->ifinfo_list, list) {
 991                 if_outgoing = neigh_ifinfo->if_outgoing;
 992
 993                 /* always keep the default interface */
 994                 if (if_outgoing == BATADV_IF_DEFAULT)
 995                         continue;
 996
 997                 /* don't purge if the interface is not (going) down */
 998                 if (if_outgoing->if_status != BATADV_IF_INACTIVE &&
 999                     if_outgoing->if_status != BATADV_IF_NOT_IN_USE &&
1000                     if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED)
1001                         continue;
1002
1003                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1004                            "neighbor/ifinfo purge: neighbor %pM, iface: %s\n",
1005                            neigh->addr, if_outgoing->net_dev->name);
1006
1007                 hlist_del_rcu(&neigh_ifinfo->list);
1008                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1009         }
1010
1011         spin_unlock_bh(&neigh->ifinfo_lock);
1012 }
1013
1014 /**
1015  * batadv_purge_orig_ifinfo() - purge obsolete ifinfo entries from originator
1016  * @bat_priv: the bat priv with all the soft interface information
1017  * @orig_node: orig node which is to be checked
1018  *
1019  * Return: true if any ifinfo entry was purged, false otherwise.
1020  */
1021 static bool
1022 batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv,
1023                          struct batadv_orig_node *orig_node)
1024 {
1025         struct batadv_orig_ifinfo *orig_ifinfo;
1026         struct batadv_hard_iface *if_outgoing;
1027         struct hlist_node *node_tmp;
1028         bool ifinfo_purged = false;
1029
1030         spin_lock_bh(&orig_node->neigh_list_lock);
1031
1032         /* for all ifinfo objects for this originator */
1033         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
1034                                   &orig_node->ifinfo_list, list) {
1035                 if_outgoing = orig_ifinfo->if_outgoing;
1036
1037                 /* always keep the default interface */
1038                 if (if_outgoing == BATADV_IF_DEFAULT)
1039                         continue;
1040
1041                 /* don't purge if the interface is not (going) down */
1042                 if (if_outgoing->if_status != BATADV_IF_INACTIVE &&
1043                     if_outgoing->if_status != BATADV_IF_NOT_IN_USE &&
1044                     if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED)
1045                         continue;
1046
1047                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1048                            "router/ifinfo purge: originator %pM, iface: %s\n",
1049                            orig_node->orig, if_outgoing->net_dev->name);
1050
1051                 ifinfo_purged = true;
1052
1053                 hlist_del_rcu(&orig_ifinfo->list);
1054                 batadv_orig_ifinfo_put(orig_ifinfo);
1055                 if (orig_node->last_bonding_candidate == orig_ifinfo) {
1056                         orig_node->last_bonding_candidate = NULL;
1057                         batadv_orig_ifinfo_put(orig_ifinfo);
1058                 }
1059         }
1060
1061         spin_unlock_bh(&orig_node->neigh_list_lock);
1062
1063         return ifinfo_purged;
1064 }
1065
1066 /**
1067  * batadv_purge_orig_neighbors() - purges neighbors from originator
1068  * @bat_priv: the bat priv with all the soft interface information
1069  * @orig_node: orig node which is to be checked
1070  *
1071  * Return: true if any neighbor was purged, false otherwise
1072  */
1073 static bool
1074 batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
1075                             struct batadv_orig_node *orig_node)
1076 {
1077         struct hlist_node *node_tmp;
1078         struct batadv_neigh_node *neigh_node;
1079         bool neigh_purged = false;
1080         unsigned long last_seen;
1081         struct batadv_hard_iface *if_incoming;
1082
1083         spin_lock_bh(&orig_node->neigh_list_lock);
1084
1085         /* for all neighbors towards this originator ... */
1086         hlist_for_each_entry_safe(neigh_node, node_tmp,
1087                                   &orig_node->neigh_list, list) {
1088                 last_seen = neigh_node->last_seen;
1089                 if_incoming = neigh_node->if_incoming;
1090
1091                 if (batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT) ||
1092                     if_incoming->if_status == BATADV_IF_INACTIVE ||
1093                     if_incoming->if_status == BATADV_IF_NOT_IN_USE ||
1094                     if_incoming->if_status == BATADV_IF_TO_BE_REMOVED) {
1095                         if (if_incoming->if_status == BATADV_IF_INACTIVE ||
1096                             if_incoming->if_status == BATADV_IF_NOT_IN_USE ||
1097                             if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)
1098                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1099                                            "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
1100                                            orig_node->orig, neigh_node->addr,
1101                                            if_incoming->net_dev->name);
1102                         else
1103                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1104                                            "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
1105                                            orig_node->orig, neigh_node->addr,
1106                                            jiffies_to_msecs(last_seen));
1107
1108                         neigh_purged = true;
1109
1110                         hlist_del_rcu(&neigh_node->list);
1111                         batadv_neigh_node_put(neigh_node);
1112                 } else {
1113                         /* only necessary if not the whole neighbor is to be
1114                          * deleted, but some interface has been removed.
1115                          */
1116                         batadv_purge_neigh_ifinfo(bat_priv, neigh_node);
1117                 }
1118         }
1119
1120         spin_unlock_bh(&orig_node->neigh_list_lock);
1121         return neigh_purged;
1122 }
1123
1124 /**
1125  * batadv_find_best_neighbor() - finds the best neighbor after purging
1126  * @bat_priv: the bat priv with all the soft interface information
1127  * @orig_node: orig node which is to be checked
1128  * @if_outgoing: the interface for which the metric should be compared
1129  *
1130  * Return: the current best neighbor, with refcount increased.
1131  */
1132 static struct batadv_neigh_node *
1133 batadv_find_best_neighbor(struct batadv_priv *bat_priv,
1134                           struct batadv_orig_node *orig_node,
1135                           struct batadv_hard_iface *if_outgoing)
1136 {
1137         struct batadv_neigh_node *best = NULL, *neigh;
1138         struct batadv_algo_ops *bao = bat_priv->algo_ops;
1139
1140         rcu_read_lock();
1141         hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) {
1142                 if (best && (bao->neigh.cmp(neigh, if_outgoing, best,
1143                                             if_outgoing) <= 0))
1144                         continue;
1145
1146                 if (!kref_get_unless_zero(&neigh->refcount))
1147                         continue;
1148
1149                 batadv_neigh_node_put(best);
1150
1151                 best = neigh;
1152         }
1153         rcu_read_unlock();
1154
1155         return best;
1156 }
1157
1158 /**
1159  * batadv_purge_orig_node() - purges obsolete information from an orig_node
1160  * @bat_priv: the bat priv with all the soft interface information
1161  * @orig_node: orig node which is to be checked
1162  *
1163  * This function checks if the orig_node or substructures of it have become
1164  * obsolete, and purges this information if that's the case.
1165  *
1166  * Return: true if the orig_node is to be removed, false otherwise.
1167  */
1168 static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
1169                                    struct batadv_orig_node *orig_node)
1170 {
1171         struct batadv_neigh_node *best_neigh_node;
1172         struct batadv_hard_iface *hard_iface;
1173         bool changed_ifinfo, changed_neigh;
1174
1175         if (batadv_has_timed_out(orig_node->last_seen,
1176                                  2 * BATADV_PURGE_TIMEOUT)) {
1177                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1178                            "Originator timeout: originator %pM, last_seen %u\n",
1179                            orig_node->orig,
1180                            jiffies_to_msecs(orig_node->last_seen));
1181                 return true;
1182         }
1183         changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node);
1184         changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node);
1185
1186         if (!changed_ifinfo && !changed_neigh)
1187                 return false;
1188
1189         /* first for NULL ... */
1190         best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node,
1191                                                     BATADV_IF_DEFAULT);
1192         batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT,
1193                             best_neigh_node);
1194         batadv_neigh_node_put(best_neigh_node);
1195
1196         /* ... then for all other interfaces. */
1197         rcu_read_lock();
1198         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1199                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1200                         continue;
1201
1202                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1203                         continue;
1204
1205                 if (!kref_get_unless_zero(&hard_iface->refcount))
1206                         continue;
1207
1208                 best_neigh_node = batadv_find_best_neighbor(bat_priv,
1209                                                             orig_node,
1210                                                             hard_iface);
1211                 batadv_update_route(bat_priv, orig_node, hard_iface,
1212                                     best_neigh_node);
1213                 batadv_neigh_node_put(best_neigh_node);
1214
1215                 batadv_hardif_put(hard_iface);
1216         }
1217         rcu_read_unlock();
1218
1219         return false;
1220 }
1221
1222 /**
1223  * batadv_purge_orig_ref() - Purge all outdated originators
1224  * @bat_priv: the bat priv with all the soft interface information
1225  */
1226 void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
1227 {
1228         struct batadv_hashtable *hash = bat_priv->orig_hash;
1229         struct hlist_node *node_tmp;
1230         struct hlist_head *head;
1231         spinlock_t *list_lock; /* spinlock to protect write access */
1232         struct batadv_orig_node *orig_node;
1233         u32 i;
1234
1235         if (!hash)
1236                 return;
1237
1238         /* for all origins... */
1239         for (i = 0; i < hash->size; i++) {
1240                 head = &hash->table[i];
1241                 list_lock = &hash->list_locks[i];
1242
1243                 spin_lock_bh(list_lock);
1244                 hlist_for_each_entry_safe(orig_node, node_tmp,
1245                                           head, hash_entry) {
1246                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
1247                                 batadv_gw_node_delete(bat_priv, orig_node);
1248                                 hlist_del_rcu(&orig_node->hash_entry);
1249                                 batadv_tt_global_del_orig(orig_node->bat_priv,
1250                                                           orig_node, -1,
1251                                                           "originator timed out");
1252                                 batadv_orig_node_put(orig_node);
1253                                 continue;
1254                         }
1255
1256                         batadv_frag_purge_orig(orig_node,
1257                                                batadv_frag_check_entry);
1258                 }
1259                 spin_unlock_bh(list_lock);
1260         }
1261
1262         batadv_gw_election(bat_priv);
1263 }
1264
1265 static void batadv_purge_orig(struct work_struct *work)
1266 {
1267         struct delayed_work *delayed_work;
1268         struct batadv_priv *bat_priv;
1269
1270         delayed_work = to_delayed_work(work);
1271         bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
1272         batadv_purge_orig_ref(bat_priv);
1273         queue_delayed_work(batadv_event_workqueue,
1274                            &bat_priv->orig_work,
1275                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
1276 }
1277
1278 /**
1279  * batadv_orig_dump() - Dump to netlink the originator infos for a specific
1280  *  outgoing interface
1281  * @msg: message to dump into
1282  * @cb: parameters for the dump
1283  *
1284  * Return: 0 or error value
1285  */
1286 int batadv_orig_dump(struct sk_buff *msg, struct netlink_callback *cb)
1287 {
1288         struct net *net = sock_net(cb->skb->sk);
1289         struct net_device *soft_iface;
1290         struct net_device *hard_iface = NULL;
1291         struct batadv_hard_iface *hardif = BATADV_IF_DEFAULT;
1292         struct batadv_priv *bat_priv;
1293         struct batadv_hard_iface *primary_if = NULL;
1294         int ret;
1295         int ifindex, hard_ifindex;
1296
1297         ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
1298         if (!ifindex)
1299                 return -EINVAL;
1300
1301         soft_iface = dev_get_by_index(net, ifindex);
1302         if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
1303                 ret = -ENODEV;
1304                 goto out;
1305         }
1306
1307         bat_priv = netdev_priv(soft_iface);
1308
1309         primary_if = batadv_primary_if_get_selected(bat_priv);
1310         if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
1311                 ret = -ENOENT;
1312                 goto out;
1313         }
1314
1315         hard_ifindex = batadv_netlink_get_ifindex(cb->nlh,
1316                                                   BATADV_ATTR_HARD_IFINDEX);
1317         if (hard_ifindex) {
1318                 hard_iface = dev_get_by_index(net, hard_ifindex);
1319                 if (hard_iface)
1320                         hardif = batadv_hardif_get_by_netdev(hard_iface);
1321
1322                 if (!hardif) {
1323                         ret = -ENODEV;
1324                         goto out;
1325                 }
1326
1327                 if (hardif->soft_iface != soft_iface) {
1328                         ret = -ENOENT;
1329                         goto out;
1330                 }
1331         }
1332
1333         if (!bat_priv->algo_ops->orig.dump) {
1334                 ret = -EOPNOTSUPP;
1335                 goto out;
1336         }
1337
1338         bat_priv->algo_ops->orig.dump(msg, cb, bat_priv, hardif);
1339
1340         ret = msg->len;
1341
1342  out:
1343         batadv_hardif_put(hardif);
1344         dev_put(hard_iface);
1345         batadv_hardif_put(primary_if);
1346         dev_put(soft_iface);
1347
1348         return ret;
1349 }