net/batman-adv/originator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2009-2020  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/seq_file.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/slab.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/stddef.h>
  28 #include <linux/workqueue.h>
  29 #include <net/sock.h>
  30 #include <uapi/linux/batadv_packet.h>
  31 #include <uapi/linux/batman_adv.h>
  32
  33 #include "bat_algo.h"
  34 #include "distributed-arp-table.h"
  35 #include "fragmentation.h"
  36 #include "gateway_client.h"
  37 #include "hard-interface.h"
  38 #include "hash.h"
  39 #include "log.h"
  40 #include "multicast.h"
  41 #include "netlink.h"
  42 #include "network-coding.h"
  43 #include "routing.h"
  44 #include "soft-interface.h"
  45 #include "translation-table.h"
  46
  47 /* hash class keys */
  48 static struct lock_class_key batadv_orig_hash_lock_class_key;
  49
  50 /**
  51  * batadv_orig_hash_find() - Find and return originator from orig_hash
  52  * @bat_priv: the bat priv with all the soft interface information
  53  * @data: mac address of the originator
  54  *
  55  * Return: orig_node (with increased refcnt), NULL on errors
  56  */
  57 struct batadv_orig_node *
  58 batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data)
  59 {
  60         struct batadv_hashtable *hash = bat_priv->orig_hash;
  61         struct hlist_head *head;
  62         struct batadv_orig_node *orig_node, *orig_node_tmp = NULL;
  63         int index;
  64
  65         if (!hash)
  66                 return NULL;
  67
  68         index = batadv_choose_orig(data, hash->size);
  69         head = &hash->table[index];
  70
  71         rcu_read_lock();
  72         hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
  73                 if (!batadv_compare_eth(orig_node, data))
  74                         continue;
  75
  76                 if (!kref_get_unless_zero(&orig_node->refcount))
  77                         continue;
  78
  79                 orig_node_tmp = orig_node;
  80                 break;
  81         }
  82         rcu_read_unlock();
  83
  84         return orig_node_tmp;
  85 }
  86
  87 static void batadv_purge_orig(struct work_struct *work);
  88
  89 /**
  90  * batadv_compare_orig() - comparing function used in the originator hash table
  91  * @node: node in the local table
  92  * @data2: second object to compare the node to
  93  *
  94  * Return: true if they are the same originator
  95  */
  96 bool batadv_compare_orig(const struct hlist_node *node, const void *data2)
  97 {
  98         const void *data1 = container_of(node, struct batadv_orig_node,
  99                                          hash_entry);
 100
 101         return batadv_compare_eth(data1, data2);
 102 }
 103
 104 /**
 105  * batadv_orig_node_vlan_get() - get an orig_node_vlan object
 106  * @orig_node: the originator serving the VLAN
 107  * @vid: the VLAN identifier
 108  *
 109  * Return: the vlan object identified by vid and belonging to orig_node or NULL
 110  * if it does not exist.
 111  */
 112 struct batadv_orig_node_vlan *
 113 batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
 114                           unsigned short vid)
 115 {
 116         struct batadv_orig_node_vlan *vlan = NULL, *tmp;
 117
 118         rcu_read_lock();
 119         hlist_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) {
 120                 if (tmp->vid != vid)
 121                         continue;
 122
 123                 if (!kref_get_unless_zero(&tmp->refcount))
 124                         continue;
 125
 126                 vlan = tmp;
 127
 128                 break;
 129         }
 130         rcu_read_unlock();
 131
 132         return vlan;
 133 }
 134
 135 /**
 136  * batadv_orig_node_vlan_new() - search and possibly create an orig_node_vlan
 137  *  object
 138  * @orig_node: the originator serving the VLAN
 139  * @vid: the VLAN identifier
 140  *
 141  * Return: NULL in case of failure or the vlan object identified by vid and
 142  * belonging to orig_node otherwise. The object is created and added to the list
 143  * if it does not exist.
 144  *
 145  * The object is returned with refcounter increased by 1.
 146  */
 147 struct batadv_orig_node_vlan *
 148 batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
 149                           unsigned short vid)
 150 {
 151         struct batadv_orig_node_vlan *vlan;
 152
 153         spin_lock_bh(&orig_node->vlan_list_lock);
 154
 155         /* first look if an object for this vid already exists */
 156         vlan = batadv_orig_node_vlan_get(orig_node, vid);
 157         if (vlan)
 158                 goto out;
 159
 160         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 161         if (!vlan)
 162                 goto out;
 163
 164         kref_init(&vlan->refcount);
 165         vlan->vid = vid;
 166
 167         kref_get(&vlan->refcount);
 168         hlist_add_head_rcu(&vlan->list, &orig_node->vlan_list);
 169
 170 out:
 171         spin_unlock_bh(&orig_node->vlan_list_lock);
 172
 173         return vlan;
 174 }
 175
 176 /**
 177  * batadv_orig_node_vlan_release() - release originator-vlan object from lists
 178  *  and queue for free after rcu grace period
 179  * @ref: kref pointer of the originator-vlan object
 180  */
 181 static void batadv_orig_node_vlan_release(struct kref *ref)
 182 {
 183         struct batadv_orig_node_vlan *orig_vlan;
 184
 185         orig_vlan = container_of(ref, struct batadv_orig_node_vlan, refcount);
 186
 187         kfree_rcu(orig_vlan, rcu);
 188 }
 189
 190 /**
 191  * batadv_orig_node_vlan_put() - decrement the refcounter and possibly release
 192  *  the originator-vlan object
 193  * @orig_vlan: the originator-vlan object to release
 194  */
 195 void batadv_orig_node_vlan_put(struct batadv_orig_node_vlan *orig_vlan)
 196 {
 197         kref_put(&orig_vlan->refcount, batadv_orig_node_vlan_release);
 198 }
 199
 200 /**
 201  * batadv_originator_init() - Initialize all originator structures
 202  * @bat_priv: the bat priv with all the soft interface information
 203  *
 204  * Return: 0 on success or negative error number in case of failure
 205  */
 206 int batadv_originator_init(struct batadv_priv *bat_priv)
 207 {
 208         if (bat_priv->orig_hash)
 209                 return 0;
 210
 211         bat_priv->orig_hash = batadv_hash_new(1024);
 212
 213         if (!bat_priv->orig_hash)
 214                 goto err;
 215
 216         batadv_hash_set_lock_class(bat_priv->orig_hash,
 217                                    &batadv_orig_hash_lock_class_key);
 218
 219         INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig);
 220         queue_delayed_work(batadv_event_workqueue,
 221                            &bat_priv->orig_work,
 222                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 223
 224         return 0;
 225
 226 err:
 227         return -ENOMEM;
 228 }
 229
 230 /**
 231  * batadv_neigh_ifinfo_release() - release neigh_ifinfo from lists and queue for
 232  *  free after rcu grace period
 233  * @ref: kref pointer of the neigh_ifinfo
 234  */
 235 static void batadv_neigh_ifinfo_release(struct kref *ref)
 236 {
 237         struct batadv_neigh_ifinfo *neigh_ifinfo;
 238
 239         neigh_ifinfo = container_of(ref, struct batadv_neigh_ifinfo, refcount);
 240
 241         if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 242                 batadv_hardif_put(neigh_ifinfo->if_outgoing);
 243
 244         kfree_rcu(neigh_ifinfo, rcu);
 245 }
 246
 247 /**
 248  * batadv_neigh_ifinfo_put() - decrement the refcounter and possibly release
 249  *  the neigh_ifinfo
 250  * @neigh_ifinfo: the neigh_ifinfo object to release
 251  */
 252 void batadv_neigh_ifinfo_put(struct batadv_neigh_ifinfo *neigh_ifinfo)
 253 {
 254         kref_put(&neigh_ifinfo->refcount, batadv_neigh_ifinfo_release);
 255 }
 256
 257 /**
 258  * batadv_hardif_neigh_release() - release hardif neigh node from lists and
 259  *  queue for free after rcu grace period
 260  * @ref: kref pointer of the neigh_node
 261  */
 262 static void batadv_hardif_neigh_release(struct kref *ref)
 263 {
 264         struct batadv_hardif_neigh_node *hardif_neigh;
 265
 266         hardif_neigh = container_of(ref, struct batadv_hardif_neigh_node,
 267                                     refcount);
 268
 269         spin_lock_bh(&hardif_neigh->if_incoming->neigh_list_lock);
 270         hlist_del_init_rcu(&hardif_neigh->list);
 271         spin_unlock_bh(&hardif_neigh->if_incoming->neigh_list_lock);
 272
 273         batadv_hardif_put(hardif_neigh->if_incoming);
 274         kfree_rcu(hardif_neigh, rcu);
 275 }
 276
 277 /**
 278  * batadv_hardif_neigh_put() - decrement the hardif neighbors refcounter
 279  *  and possibly release it
 280  * @hardif_neigh: hardif neigh neighbor to free
 281  */
 282 void batadv_hardif_neigh_put(struct batadv_hardif_neigh_node *hardif_neigh)
 283 {
 284         kref_put(&hardif_neigh->refcount, batadv_hardif_neigh_release);
 285 }
 286
 287 /**
 288  * batadv_neigh_node_release() - release neigh_node from lists and queue for
 289  *  free after rcu grace period
 290  * @ref: kref pointer of the neigh_node
 291  */
 292 static void batadv_neigh_node_release(struct kref *ref)
 293 {
 294         struct hlist_node *node_tmp;
 295         struct batadv_neigh_node *neigh_node;
 296         struct batadv_neigh_ifinfo *neigh_ifinfo;
 297
 298         neigh_node = container_of(ref, struct batadv_neigh_node, refcount);
 299
 300         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
 301                                   &neigh_node->ifinfo_list, list) {
 302                 batadv_neigh_ifinfo_put(neigh_ifinfo);
 303         }
 304
 305         batadv_hardif_neigh_put(neigh_node->hardif_neigh);
 306
 307         batadv_hardif_put(neigh_node->if_incoming);
 308
 309         kfree_rcu(neigh_node, rcu);
 310 }
 311
 312 /**
 313  * batadv_neigh_node_put() - decrement the neighbors refcounter and possibly
 314  *  release it
 315  * @neigh_node: neigh neighbor to free
 316  */
 317 void batadv_neigh_node_put(struct batadv_neigh_node *neigh_node)
 318 {
 319         kref_put(&neigh_node->refcount, batadv_neigh_node_release);
 320 }
 321
 322 /**
 323  * batadv_orig_router_get() - router to the originator depending on iface
 324  * @orig_node: the orig node for the router
 325  * @if_outgoing: the interface where the payload packet has been received or
 326  *  the OGM should be sent to
 327  *
 328  * Return: the neighbor which should be the router for this orig_node/iface.
 329  *
 330  * The object is returned with refcounter increased by 1.
 331  */
 332 struct batadv_neigh_node *
 333 batadv_orig_router_get(struct batadv_orig_node *orig_node,
 334                        const struct batadv_hard_iface *if_outgoing)
 335 {
 336         struct batadv_orig_ifinfo *orig_ifinfo;
 337         struct batadv_neigh_node *router = NULL;
 338
 339         rcu_read_lock();
 340         hlist_for_each_entry_rcu(orig_ifinfo, &orig_node->ifinfo_list, list) {
 341                 if (orig_ifinfo->if_outgoing != if_outgoing)
 342                         continue;
 343
 344                 router = rcu_dereference(orig_ifinfo->router);
 345                 break;
 346         }
 347
 348         if (router && !kref_get_unless_zero(&router->refcount))
 349                 router = NULL;
 350
 351         rcu_read_unlock();
 352         return router;
 353 }
 354
 355 /**
 356  * batadv_orig_ifinfo_get() - find the ifinfo from an orig_node
 357  * @orig_node: the orig node to be queried
 358  * @if_outgoing: the interface for which the ifinfo should be acquired
 359  *
 360  * Return: the requested orig_ifinfo or NULL if not found.
 361  *
 362  * The object is returned with refcounter increased by 1.
 363  */
 364 struct batadv_orig_ifinfo *
 365 batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node,
 366                        struct batadv_hard_iface *if_outgoing)
 367 {
 368         struct batadv_orig_ifinfo *tmp, *orig_ifinfo = NULL;
 369
 370         rcu_read_lock();
 371         hlist_for_each_entry_rcu(tmp, &orig_node->ifinfo_list,
 372                                  list) {
 373                 if (tmp->if_outgoing != if_outgoing)
 374                         continue;
 375
 376                 if (!kref_get_unless_zero(&tmp->refcount))
 377                         continue;
 378
 379                 orig_ifinfo = tmp;
 380                 break;
 381         }
 382         rcu_read_unlock();
 383
 384         return orig_ifinfo;
 385 }
 386
 387 /**
 388  * batadv_orig_ifinfo_new() - search and possibly create an orig_ifinfo object
 389  * @orig_node: the orig node to be queried
 390  * @if_outgoing: the interface for which the ifinfo should be acquired
 391  *
 392  * Return: NULL in case of failure or the orig_ifinfo object for the if_outgoing
 393  * interface otherwise. The object is created and added to the list
 394  * if it does not exist.
 395  *
 396  * The object is returned with refcounter increased by 1.
 397  */
 398 struct batadv_orig_ifinfo *
 399 batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node,
 400                        struct batadv_hard_iface *if_outgoing)
 401 {
 402         struct batadv_orig_ifinfo *orig_ifinfo;
 403         unsigned long reset_time;
 404
 405         spin_lock_bh(&orig_node->neigh_list_lock);
 406
 407         orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing);
 408         if (orig_ifinfo)
 409                 goto out;
 410
 411         orig_ifinfo = kzalloc(sizeof(*orig_ifinfo), GFP_ATOMIC);
 412         if (!orig_ifinfo)
 413                 goto out;
 414
 415         if (if_outgoing != BATADV_IF_DEFAULT)
 416                 kref_get(&if_outgoing->refcount);
 417
 418         reset_time = jiffies - 1;
 419         reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 420         orig_ifinfo->batman_seqno_reset = reset_time;
 421         orig_ifinfo->if_outgoing = if_outgoing;
 422         INIT_HLIST_NODE(&orig_ifinfo->list);
 423         kref_init(&orig_ifinfo->refcount);
 424
 425         kref_get(&orig_ifinfo->refcount);
 426         hlist_add_head_rcu(&orig_ifinfo->list,
 427                            &orig_node->ifinfo_list);
 428 out:
 429         spin_unlock_bh(&orig_node->neigh_list_lock);
 430         return orig_ifinfo;
 431 }
 432
 433 /**
 434  * batadv_neigh_ifinfo_get() - find the ifinfo from an neigh_node
 435  * @neigh: the neigh node to be queried
 436  * @if_outgoing: the interface for which the ifinfo should be acquired
 437  *
 438  * The object is returned with refcounter increased by 1.
 439  *
 440  * Return: the requested neigh_ifinfo or NULL if not found
 441  */
 442 struct batadv_neigh_ifinfo *
 443 batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh,
 444                         struct batadv_hard_iface *if_outgoing)
 445 {
 446         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL,
 447                                    *tmp_neigh_ifinfo;
 448
 449         rcu_read_lock();
 450         hlist_for_each_entry_rcu(tmp_neigh_ifinfo, &neigh->ifinfo_list,
 451                                  list) {
 452                 if (tmp_neigh_ifinfo->if_outgoing != if_outgoing)
 453                         continue;
 454
 455                 if (!kref_get_unless_zero(&tmp_neigh_ifinfo->refcount))
 456                         continue;
 457
 458                 neigh_ifinfo = tmp_neigh_ifinfo;
 459                 break;
 460         }
 461         rcu_read_unlock();
 462
 463         return neigh_ifinfo;
 464 }
 465
 466 /**
 467  * batadv_neigh_ifinfo_new() - search and possibly create an neigh_ifinfo object
 468  * @neigh: the neigh node to be queried
 469  * @if_outgoing: the interface for which the ifinfo should be acquired
 470  *
 471  * Return: NULL in case of failure or the neigh_ifinfo object for the
 472  * if_outgoing interface otherwise. The object is created and added to the list
 473  * if it does not exist.
 474  *
 475  * The object is returned with refcounter increased by 1.
 476  */
 477 struct batadv_neigh_ifinfo *
 478 batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh,
 479                         struct batadv_hard_iface *if_outgoing)
 480 {
 481         struct batadv_neigh_ifinfo *neigh_ifinfo;
 482
 483         spin_lock_bh(&neigh->ifinfo_lock);
 484
 485         neigh_ifinfo = batadv_neigh_ifinfo_get(neigh, if_outgoing);
 486         if (neigh_ifinfo)
 487                 goto out;
 488
 489         neigh_ifinfo = kzalloc(sizeof(*neigh_ifinfo), GFP_ATOMIC);
 490         if (!neigh_ifinfo)
 491                 goto out;
 492
 493         if (if_outgoing)
 494                 kref_get(&if_outgoing->refcount);
 495
 496         INIT_HLIST_NODE(&neigh_ifinfo->list);
 497         kref_init(&neigh_ifinfo->refcount);
 498         neigh_ifinfo->if_outgoing = if_outgoing;
 499
 500         kref_get(&neigh_ifinfo->refcount);
 501         hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list);
 502
 503 out:
 504         spin_unlock_bh(&neigh->ifinfo_lock);
 505
 506         return neigh_ifinfo;
 507 }
 508
 509 /**
 510  * batadv_neigh_node_get() - retrieve a neighbour from the list
 511  * @orig_node: originator which the neighbour belongs to
 512  * @hard_iface: the interface where this neighbour is connected to
 513  * @addr: the address of the neighbour
 514  *
 515  * Looks for and possibly returns a neighbour belonging to this originator list
 516  * which is connected through the provided hard interface.
 517  *
 518  * Return: neighbor when found. Otherwise NULL
 519  */
 520 static struct batadv_neigh_node *
 521 batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
 522                       const struct batadv_hard_iface *hard_iface,
 523                       const u8 *addr)
 524 {
 525         struct batadv_neigh_node *tmp_neigh_node, *res = NULL;
 526
 527         rcu_read_lock();
 528         hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) {
 529                 if (!batadv_compare_eth(tmp_neigh_node->addr, addr))
 530                         continue;
 531
 532                 if (tmp_neigh_node->if_incoming != hard_iface)
 533                         continue;
 534
 535                 if (!kref_get_unless_zero(&tmp_neigh_node->refcount))
 536                         continue;
 537
 538                 res = tmp_neigh_node;
 539                 break;
 540         }
 541         rcu_read_unlock();
 542
 543         return res;
 544 }
 545
 546 /**
 547  * batadv_hardif_neigh_create() - create a hardif neighbour node
 548  * @hard_iface: the interface this neighbour is connected to
 549  * @neigh_addr: the interface address of the neighbour to retrieve
 550  * @orig_node: originator object representing the neighbour
 551  *
 552  * Return: the hardif neighbour node if found or created or NULL otherwise.
 553  */
 554 static struct batadv_hardif_neigh_node *
 555 batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface,
 556                            const u8 *neigh_addr,
 557                            struct batadv_orig_node *orig_node)
 558 {
 559         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 560         struct batadv_hardif_neigh_node *hardif_neigh;
 561
 562         spin_lock_bh(&hard_iface->neigh_list_lock);
 563
 564         /* check if neighbor hasn't been added in the meantime */
 565         hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr);
 566         if (hardif_neigh)
 567                 goto out;
 568
 569         hardif_neigh = kzalloc(sizeof(*hardif_neigh), GFP_ATOMIC);
 570         if (!hardif_neigh)
 571                 goto out;
 572
 573         kref_get(&hard_iface->refcount);
 574         INIT_HLIST_NODE(&hardif_neigh->list);
 575         ether_addr_copy(hardif_neigh->addr, neigh_addr);
 576         ether_addr_copy(hardif_neigh->orig, orig_node->orig);
 577         hardif_neigh->if_incoming = hard_iface;
 578         hardif_neigh->last_seen = jiffies;
 579
 580         kref_init(&hardif_neigh->refcount);
 581
 582         if (bat_priv->algo_ops->neigh.hardif_init)
 583                 bat_priv->algo_ops->neigh.hardif_init(hardif_neigh);
 584
 585         hlist_add_head_rcu(&hardif_neigh->list, &hard_iface->neigh_list);
 586
 587 out:
 588         spin_unlock_bh(&hard_iface->neigh_list_lock);
 589         return hardif_neigh;
 590 }
 591
 592 /**
 593  * batadv_hardif_neigh_get_or_create() - retrieve or create a hardif neighbour
 594  *  node
 595  * @hard_iface: the interface this neighbour is connected to
 596  * @neigh_addr: the interface address of the neighbour to retrieve
 597  * @orig_node: originator object representing the neighbour
 598  *
 599  * Return: the hardif neighbour node if found or created or NULL otherwise.
 600  */
 601 static struct batadv_hardif_neigh_node *
 602 batadv_hardif_neigh_get_or_create(struct batadv_hard_iface *hard_iface,
 603                                   const u8 *neigh_addr,
 604                                   struct batadv_orig_node *orig_node)
 605 {
 606         struct batadv_hardif_neigh_node *hardif_neigh;
 607
 608         /* first check without locking to avoid the overhead */
 609         hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr);
 610         if (hardif_neigh)
 611                 return hardif_neigh;
 612
 613         return batadv_hardif_neigh_create(hard_iface, neigh_addr, orig_node);
 614 }
 615
 616 /**
 617  * batadv_hardif_neigh_get() - retrieve a hardif neighbour from the list
 618  * @hard_iface: the interface where this neighbour is connected to
 619  * @neigh_addr: the address of the neighbour
 620  *
 621  * Looks for and possibly returns a neighbour belonging to this hard interface.
 622  *
 623  * Return: neighbor when found. Otherwise NULL
 624  */
 625 struct batadv_hardif_neigh_node *
 626 batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface,
 627                         const u8 *neigh_addr)
 628 {
 629         struct batadv_hardif_neigh_node *tmp_hardif_neigh, *hardif_neigh = NULL;
 630
 631         rcu_read_lock();
 632         hlist_for_each_entry_rcu(tmp_hardif_neigh,
 633                                  &hard_iface->neigh_list, list) {
 634                 if (!batadv_compare_eth(tmp_hardif_neigh->addr, neigh_addr))
 635                         continue;
 636
 637                 if (!kref_get_unless_zero(&tmp_hardif_neigh->refcount))
 638                         continue;
 639
 640                 hardif_neigh = tmp_hardif_neigh;
 641                 break;
 642         }
 643         rcu_read_unlock();
 644
 645         return hardif_neigh;
 646 }
 647
 648 /**
 649  * batadv_neigh_node_create() - create a neigh node object
 650  * @orig_node: originator object representing the neighbour
 651  * @hard_iface: the interface where the neighbour is connected to
 652  * @neigh_addr: the mac address of the neighbour interface
 653  *
 654  * Allocates a new neigh_node object and initialises all the generic fields.
 655  *
 656  * Return: the neighbour node if found or created or NULL otherwise.
 657  */
 658 static struct batadv_neigh_node *
 659 batadv_neigh_node_create(struct batadv_orig_node *orig_node,
 660                          struct batadv_hard_iface *hard_iface,
 661                          const u8 *neigh_addr)
 662 {
 663         struct batadv_neigh_node *neigh_node;
 664         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
 665
 666         spin_lock_bh(&orig_node->neigh_list_lock);
 667
 668         neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr);
 669         if (neigh_node)
 670                 goto out;
 671
 672         hardif_neigh = batadv_hardif_neigh_get_or_create(hard_iface,
 673                                                          neigh_addr, orig_node);
 674         if (!hardif_neigh)
 675                 goto out;
 676
 677         neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
 678         if (!neigh_node)
 679                 goto out;
 680
 681         INIT_HLIST_NODE(&neigh_node->list);
 682         INIT_HLIST_HEAD(&neigh_node->ifinfo_list);
 683         spin_lock_init(&neigh_node->ifinfo_lock);
 684
 685         kref_get(&hard_iface->refcount);
 686         ether_addr_copy(neigh_node->addr, neigh_addr);
 687         neigh_node->if_incoming = hard_iface;
 688         neigh_node->orig_node = orig_node;
 689         neigh_node->last_seen = jiffies;
 690
 691         /* increment unique neighbor refcount */
 692         kref_get(&hardif_neigh->refcount);
 693         neigh_node->hardif_neigh = hardif_neigh;
 694
 695         /* extra reference for return */
 696         kref_init(&neigh_node->refcount);
 697
 698         kref_get(&neigh_node->refcount);
 699         hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
 700
 701         batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv,
 702                    "Creating new neighbor %pM for orig_node %pM on interface %s\n",
 703                    neigh_addr, orig_node->orig, hard_iface->net_dev->name);
 704
 705 out:
 706         spin_unlock_bh(&orig_node->neigh_list_lock);
 707
 708         if (hardif_neigh)
 709                 batadv_hardif_neigh_put(hardif_neigh);
 710         return neigh_node;
 711 }
 712
 713 /**
 714  * batadv_neigh_node_get_or_create() - retrieve or create a neigh node object
 715  * @orig_node: originator object representing the neighbour
 716  * @hard_iface: the interface where the neighbour is connected to
 717  * @neigh_addr: the mac address of the neighbour interface
 718  *
 719  * Return: the neighbour node if found or created or NULL otherwise.
 720  */
 721 struct batadv_neigh_node *
 722 batadv_neigh_node_get_or_create(struct batadv_orig_node *orig_node,
 723                                 struct batadv_hard_iface *hard_iface,
 724                                 const u8 *neigh_addr)
 725 {
 726         struct batadv_neigh_node *neigh_node;
 727
 728         /* first check without locking to avoid the overhead */
 729         neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr);
 730         if (neigh_node)
 731                 return neigh_node;
 732
 733         return batadv_neigh_node_create(orig_node, hard_iface, neigh_addr);
 734 }
 735
 736 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
 737 /**
 738  * batadv_hardif_neigh_seq_print_text() - print the single hop neighbour list
 739  * @seq: neighbour table seq_file struct
 740  * @offset: not used
 741  *
 742  * Return: always 0
 743  */
 744 int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset)
 745 {
 746         struct net_device *net_dev = (struct net_device *)seq->private;
 747         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 748         struct batadv_hard_iface *primary_if;
 749
 750         primary_if = batadv_seq_print_text_primary_if_get(seq);
 751         if (!primary_if)
 752                 return 0;
 753
 754         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
 755                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
 756                    primary_if->net_dev->dev_addr, net_dev->name,
 757                    bat_priv->algo_ops->name);
 758
 759         batadv_hardif_put(primary_if);
 760
 761         if (!bat_priv->algo_ops->neigh.print) {
 762                 seq_puts(seq,
 763                          "No printing function for this routing protocol\n");
 764                 return 0;
 765         }
 766
 767         bat_priv->algo_ops->neigh.print(bat_priv, seq);
 768         return 0;
 769 }
 770 #endif
 771
 772 /**
 773  * batadv_hardif_neigh_dump() - Dump to netlink the neighbor infos for a
 774  *  specific outgoing interface
 775  * @msg: message to dump into
 776  * @cb: parameters for the dump
 777  *
 778  * Return: 0 or error value
 779  */
 780 int batadv_hardif_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb)
 781 {
 782         struct net *net = sock_net(cb->skb->sk);
 783         struct net_device *soft_iface;
 784         struct net_device *hard_iface = NULL;
 785         struct batadv_hard_iface *hardif = BATADV_IF_DEFAULT;
 786         struct batadv_priv *bat_priv;
 787         struct batadv_hard_iface *primary_if = NULL;
 788         int ret;
 789         int ifindex, hard_ifindex;
 790
 791         ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
 792         if (!ifindex)
 793                 return -EINVAL;
 794
 795         soft_iface = dev_get_by_index(net, ifindex);
 796         if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
 797                 ret = -ENODEV;
 798                 goto out;
 799         }
 800
 801         bat_priv = netdev_priv(soft_iface);
 802
 803         primary_if = batadv_primary_if_get_selected(bat_priv);
 804         if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
 805                 ret = -ENOENT;
 806                 goto out;
 807         }
 808
 809         hard_ifindex = batadv_netlink_get_ifindex(cb->nlh,
 810                                                   BATADV_ATTR_HARD_IFINDEX);
 811         if (hard_ifindex) {
 812                 hard_iface = dev_get_by_index(net, hard_ifindex);
 813                 if (hard_iface)
 814                         hardif = batadv_hardif_get_by_netdev(hard_iface);
 815
 816                 if (!hardif) {
 817                         ret = -ENODEV;
 818                         goto out;
 819                 }
 820
 821                 if (hardif->soft_iface != soft_iface) {
 822                         ret = -ENOENT;
 823                         goto out;
 824                 }
 825         }
 826
 827         if (!bat_priv->algo_ops->neigh.dump) {
 828                 ret = -EOPNOTSUPP;
 829                 goto out;
 830         }
 831
 832         bat_priv->algo_ops->neigh.dump(msg, cb, bat_priv, hardif);
 833
 834         ret = msg->len;
 835
 836  out:
 837         if (hardif)
 838                 batadv_hardif_put(hardif);
 839         if (hard_iface)
 840                 dev_put(hard_iface);
 841         if (primary_if)
 842                 batadv_hardif_put(primary_if);
 843         if (soft_iface)
 844                 dev_put(soft_iface);
 845
 846         return ret;
 847 }
 848
 849 /**
 850  * batadv_orig_ifinfo_release() - release orig_ifinfo from lists and queue for
 851  *  free after rcu grace period
 852  * @ref: kref pointer of the orig_ifinfo
 853  */
 854 static void batadv_orig_ifinfo_release(struct kref *ref)
 855 {
 856         struct batadv_orig_ifinfo *orig_ifinfo;
 857         struct batadv_neigh_node *router;
 858
 859         orig_ifinfo = container_of(ref, struct batadv_orig_ifinfo, refcount);
 860
 861         if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 862                 batadv_hardif_put(orig_ifinfo->if_outgoing);
 863
 864         /* this is the last reference to this object */
 865         router = rcu_dereference_protected(orig_ifinfo->router, true);
 866         if (router)
 867                 batadv_neigh_node_put(router);
 868
 869         kfree_rcu(orig_ifinfo, rcu);
 870 }
 871
 872 /**
 873  * batadv_orig_ifinfo_put() - decrement the refcounter and possibly release
 874  *  the orig_ifinfo
 875  * @orig_ifinfo: the orig_ifinfo object to release
 876  */
 877 void batadv_orig_ifinfo_put(struct batadv_orig_ifinfo *orig_ifinfo)
 878 {
 879         kref_put(&orig_ifinfo->refcount, batadv_orig_ifinfo_release);
 880 }
 881
 882 /**
 883  * batadv_orig_node_free_rcu() - free the orig_node
 884  * @rcu: rcu pointer of the orig_node
 885  */
 886 static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 887 {
 888         struct batadv_orig_node *orig_node;
 889
 890         orig_node = container_of(rcu, struct batadv_orig_node, rcu);
 891
 892         batadv_mcast_purge_orig(orig_node);
 893
 894         batadv_frag_purge_orig(orig_node, NULL);
 895
 896         kfree(orig_node->tt_buff);
 897         kfree(orig_node);
 898 }
 899
 900 /**
 901  * batadv_orig_node_release() - release orig_node from lists and queue for
 902  *  free after rcu grace period
 903  * @ref: kref pointer of the orig_node
 904  */
 905 static void batadv_orig_node_release(struct kref *ref)
 906 {
 907         struct hlist_node *node_tmp;
 908         struct batadv_neigh_node *neigh_node;
 909         struct batadv_orig_node *orig_node;
 910         struct batadv_orig_ifinfo *orig_ifinfo;
 911         struct batadv_orig_node_vlan *vlan;
 912         struct batadv_orig_ifinfo *last_candidate;
 913
 914         orig_node = container_of(ref, struct batadv_orig_node, refcount);
 915
 916         spin_lock_bh(&orig_node->neigh_list_lock);
 917
 918         /* for all neighbors towards this originator ... */
 919         hlist_for_each_entry_safe(neigh_node, node_tmp,
 920                                   &orig_node->neigh_list, list) {
 921                 hlist_del_rcu(&neigh_node->list);
 922                 batadv_neigh_node_put(neigh_node);
 923         }
 924
 925         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 926                                   &orig_node->ifinfo_list, list) {
 927                 hlist_del_rcu(&orig_ifinfo->list);
 928                 batadv_orig_ifinfo_put(orig_ifinfo);
 929         }
 930
 931         last_candidate = orig_node->last_bonding_candidate;
 932         orig_node->last_bonding_candidate = NULL;
 933         spin_unlock_bh(&orig_node->neigh_list_lock);
 934
 935         if (last_candidate)
 936                 batadv_orig_ifinfo_put(last_candidate);
 937
 938         spin_lock_bh(&orig_node->vlan_list_lock);
 939         hlist_for_each_entry_safe(vlan, node_tmp, &orig_node->vlan_list, list) {
 940                 hlist_del_rcu(&vlan->list);
 941                 batadv_orig_node_vlan_put(vlan);
 942         }
 943         spin_unlock_bh(&orig_node->vlan_list_lock);
 944
 945         /* Free nc_nodes */
 946         batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 947
 948         call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
 949 }
 950
 951 /**
 952  * batadv_orig_node_put() - decrement the orig node refcounter and possibly
 953  *  release it
 954  * @orig_node: the orig node to free
 955  */
 956 void batadv_orig_node_put(struct batadv_orig_node *orig_node)
 957 {
 958         kref_put(&orig_node->refcount, batadv_orig_node_release);
 959 }
 960
 961 /**
 962  * batadv_originator_free() - Free all originator structures
 963  * @bat_priv: the bat priv with all the soft interface information
 964  */
 965 void batadv_originator_free(struct batadv_priv *bat_priv)
 966 {
 967         struct batadv_hashtable *hash = bat_priv->orig_hash;
 968         struct hlist_node *node_tmp;
 969         struct hlist_head *head;
 970         spinlock_t *list_lock; /* spinlock to protect write access */
 971         struct batadv_orig_node *orig_node;
 972         u32 i;
 973
 974         if (!hash)
 975                 return;
 976
 977         cancel_delayed_work_sync(&bat_priv->orig_work);
 978
 979         bat_priv->orig_hash = NULL;
 980
 981         for (i = 0; i < hash->size; i++) {
 982                 head = &hash->table[i];
 983                 list_lock = &hash->list_locks[i];
 984
 985                 spin_lock_bh(list_lock);
 986                 hlist_for_each_entry_safe(orig_node, node_tmp,
 987                                           head, hash_entry) {
 988                         hlist_del_rcu(&orig_node->hash_entry);
 989                         batadv_orig_node_put(orig_node);
 990                 }
 991                 spin_unlock_bh(list_lock);
 992         }
 993
 994         batadv_hash_destroy(hash);
 995 }
 996
 997 /**
 998  * batadv_orig_node_new() - creates a new orig_node
 999  * @bat_priv: the bat priv with all the soft interface information
1000  * @addr: the mac address of the originator
1001  *
1002  * Creates a new originator object and initialises all the generic fields.
1003  * The new object is not added to the originator list.
1004  *
1005  * Return: the newly created object or NULL on failure.
1006  */
1007 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
1008                                               const u8 *addr)
1009 {
1010         struct batadv_orig_node *orig_node;
1011         struct batadv_orig_node_vlan *vlan;
1012         unsigned long reset_time;
1013         int i;
1014
1015         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1016                    "Creating new originator: %pM\n", addr);
1017
1018         orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
1019         if (!orig_node)
1020                 return NULL;
1021
1022         INIT_HLIST_HEAD(&orig_node->neigh_list);
1023         INIT_HLIST_HEAD(&orig_node->vlan_list);
1024         INIT_HLIST_HEAD(&orig_node->ifinfo_list);
1025         spin_lock_init(&orig_node->bcast_seqno_lock);
1026         spin_lock_init(&orig_node->neigh_list_lock);
1027         spin_lock_init(&orig_node->tt_buff_lock);
1028         spin_lock_init(&orig_node->tt_lock);
1029         spin_lock_init(&orig_node->vlan_list_lock);
1030
1031         batadv_nc_init_orig(orig_node);
1032
1033         /* extra reference for return */
1034         kref_init(&orig_node->refcount);
1035
1036         orig_node->bat_priv = bat_priv;
1037         ether_addr_copy(orig_node->orig, addr);
1038         batadv_dat_init_orig_node_addr(orig_node);
1039         atomic_set(&orig_node->last_ttvn, 0);
1040         orig_node->tt_buff = NULL;
1041         orig_node->tt_buff_len = 0;
1042         orig_node->last_seen = jiffies;
1043         reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
1044         orig_node->bcast_seqno_reset = reset_time;
1045
1046 #ifdef CONFIG_BATMAN_ADV_MCAST
1047         orig_node->mcast_flags = BATADV_MCAST_WANT_NO_RTR4;
1048         orig_node->mcast_flags |= BATADV_MCAST_WANT_NO_RTR6;
1049         INIT_HLIST_NODE(&orig_node->mcast_want_all_unsnoopables_node);
1050         INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv4_node);
1051         INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv6_node);
1052         spin_lock_init(&orig_node->mcast_handler_lock);
1053 #endif
1054
1055         /* create a vlan object for the "untagged" LAN */
1056         vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);
1057         if (!vlan)
1058                 goto free_orig_node;
1059         /* batadv_orig_node_vlan_new() increases the refcounter.
1060          * Immediately release vlan since it is not needed anymore in this
1061          * context
1062          */
1063         batadv_orig_node_vlan_put(vlan);
1064
1065         for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
1066                 INIT_HLIST_HEAD(&orig_node->fragments[i].fragment_list);
1067                 spin_lock_init(&orig_node->fragments[i].lock);
1068                 orig_node->fragments[i].size = 0;
1069         }
1070
1071         return orig_node;
1072 free_orig_node:
1073         kfree(orig_node);
1074         return NULL;
1075 }
1076
1077 /**
1078  * batadv_purge_neigh_ifinfo() - purge obsolete ifinfo entries from neighbor
1079  * @bat_priv: the bat priv with all the soft interface information
1080  * @neigh: orig node which is to be checked
1081  */
1082 static void
1083 batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv,
1084                           struct batadv_neigh_node *neigh)
1085 {
1086         struct batadv_neigh_ifinfo *neigh_ifinfo;
1087         struct batadv_hard_iface *if_outgoing;
1088         struct hlist_node *node_tmp;
1089
1090         spin_lock_bh(&neigh->ifinfo_lock);
1091
1092         /* for all ifinfo objects for this neighinator */
1093         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
1094                                   &neigh->ifinfo_list, list) {
1095                 if_outgoing = neigh_ifinfo->if_outgoing;
1096
1097                 /* always keep the default interface */
1098                 if (if_outgoing == BATADV_IF_DEFAULT)
1099                         continue;
1100
1101                 /* don't purge if the interface is not (going) down */
1102                 if (if_outgoing->if_status != BATADV_IF_INACTIVE &&
1103                     if_outgoing->if_status != BATADV_IF_NOT_IN_USE &&
1104                     if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED)
1105                         continue;
1106
1107                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1108                            "neighbor/ifinfo purge: neighbor %pM, iface: %s\n",
1109                            neigh->addr, if_outgoing->net_dev->name);
1110
1111                 hlist_del_rcu(&neigh_ifinfo->list);
1112                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1113         }
1114
1115         spin_unlock_bh(&neigh->ifinfo_lock);
1116 }
1117
1118 /**
1119  * batadv_purge_orig_ifinfo() - purge obsolete ifinfo entries from originator
1120  * @bat_priv: the bat priv with all the soft interface information
1121  * @orig_node: orig node which is to be checked
1122  *
1123  * Return: true if any ifinfo entry was purged, false otherwise.
1124  */
1125 static bool
1126 batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv,
1127                          struct batadv_orig_node *orig_node)
1128 {
1129         struct batadv_orig_ifinfo *orig_ifinfo;
1130         struct batadv_hard_iface *if_outgoing;
1131         struct hlist_node *node_tmp;
1132         bool ifinfo_purged = false;
1133
1134         spin_lock_bh(&orig_node->neigh_list_lock);
1135
1136         /* for all ifinfo objects for this originator */
1137         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
1138                                   &orig_node->ifinfo_list, list) {
1139                 if_outgoing = orig_ifinfo->if_outgoing;
1140
1141                 /* always keep the default interface */
1142                 if (if_outgoing == BATADV_IF_DEFAULT)
1143                         continue;
1144
1145                 /* don't purge if the interface is not (going) down */
1146                 if (if_outgoing->if_status != BATADV_IF_INACTIVE &&
1147                     if_outgoing->if_status != BATADV_IF_NOT_IN_USE &&
1148                     if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED)
1149                         continue;
1150
1151                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1152                            "router/ifinfo purge: originator %pM, iface: %s\n",
1153                            orig_node->orig, if_outgoing->net_dev->name);
1154
1155                 ifinfo_purged = true;
1156
1157                 hlist_del_rcu(&orig_ifinfo->list);
1158                 batadv_orig_ifinfo_put(orig_ifinfo);
1159                 if (orig_node->last_bonding_candidate == orig_ifinfo) {
1160                         orig_node->last_bonding_candidate = NULL;
1161                         batadv_orig_ifinfo_put(orig_ifinfo);
1162                 }
1163         }
1164
1165         spin_unlock_bh(&orig_node->neigh_list_lock);
1166
1167         return ifinfo_purged;
1168 }
1169
1170 /**
1171  * batadv_purge_orig_neighbors() - purges neighbors from originator
1172  * @bat_priv: the bat priv with all the soft interface information
1173  * @orig_node: orig node which is to be checked
1174  *
1175  * Return: true if any neighbor was purged, false otherwise
1176  */
1177 static bool
1178 batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
1179                             struct batadv_orig_node *orig_node)
1180 {
1181         struct hlist_node *node_tmp;
1182         struct batadv_neigh_node *neigh_node;
1183         bool neigh_purged = false;
1184         unsigned long last_seen;
1185         struct batadv_hard_iface *if_incoming;
1186
1187         spin_lock_bh(&orig_node->neigh_list_lock);
1188
1189         /* for all neighbors towards this originator ... */
1190         hlist_for_each_entry_safe(neigh_node, node_tmp,
1191                                   &orig_node->neigh_list, list) {
1192                 last_seen = neigh_node->last_seen;
1193                 if_incoming = neigh_node->if_incoming;
1194
1195                 if (batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT) ||
1196                     if_incoming->if_status == BATADV_IF_INACTIVE ||
1197                     if_incoming->if_status == BATADV_IF_NOT_IN_USE ||
1198                     if_incoming->if_status == BATADV_IF_TO_BE_REMOVED) {
1199                         if (if_incoming->if_status == BATADV_IF_INACTIVE ||
1200                             if_incoming->if_status == BATADV_IF_NOT_IN_USE ||
1201                             if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)
1202                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1203                                            "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
1204                                            orig_node->orig, neigh_node->addr,
1205                                            if_incoming->net_dev->name);
1206                         else
1207                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1208                                            "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
1209                                            orig_node->orig, neigh_node->addr,
1210                                            jiffies_to_msecs(last_seen));
1211
1212                         neigh_purged = true;
1213
1214                         hlist_del_rcu(&neigh_node->list);
1215                         batadv_neigh_node_put(neigh_node);
1216                 } else {
1217                         /* only necessary if not the whole neighbor is to be
1218                          * deleted, but some interface has been removed.
1219                          */
1220                         batadv_purge_neigh_ifinfo(bat_priv, neigh_node);
1221                 }
1222         }
1223
1224         spin_unlock_bh(&orig_node->neigh_list_lock);
1225         return neigh_purged;
1226 }
1227
1228 /**
1229  * batadv_find_best_neighbor() - finds the best neighbor after purging
1230  * @bat_priv: the bat priv with all the soft interface information
1231  * @orig_node: orig node which is to be checked
1232  * @if_outgoing: the interface for which the metric should be compared
1233  *
1234  * Return: the current best neighbor, with refcount increased.
1235  */
1236 static struct batadv_neigh_node *
1237 batadv_find_best_neighbor(struct batadv_priv *bat_priv,
1238                           struct batadv_orig_node *orig_node,
1239                           struct batadv_hard_iface *if_outgoing)
1240 {
1241         struct batadv_neigh_node *best = NULL, *neigh;
1242         struct batadv_algo_ops *bao = bat_priv->algo_ops;
1243
1244         rcu_read_lock();
1245         hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) {
1246                 if (best && (bao->neigh.cmp(neigh, if_outgoing, best,
1247                                             if_outgoing) <= 0))
1248                         continue;
1249
1250                 if (!kref_get_unless_zero(&neigh->refcount))
1251                         continue;
1252
1253                 if (best)
1254                         batadv_neigh_node_put(best);
1255
1256                 best = neigh;
1257         }
1258         rcu_read_unlock();
1259
1260         return best;
1261 }
1262
1263 /**
1264  * batadv_purge_orig_node() - purges obsolete information from an orig_node
1265  * @bat_priv: the bat priv with all the soft interface information
1266  * @orig_node: orig node which is to be checked
1267  *
1268  * This function checks if the orig_node or substructures of it have become
1269  * obsolete, and purges this information if that's the case.
1270  *
1271  * Return: true if the orig_node is to be removed, false otherwise.
1272  */
1273 static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
1274                                    struct batadv_orig_node *orig_node)
1275 {
1276         struct batadv_neigh_node *best_neigh_node;
1277         struct batadv_hard_iface *hard_iface;
1278         bool changed_ifinfo, changed_neigh;
1279
1280         if (batadv_has_timed_out(orig_node->last_seen,
1281                                  2 * BATADV_PURGE_TIMEOUT)) {
1282                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1283                            "Originator timeout: originator %pM, last_seen %u\n",
1284                            orig_node->orig,
1285                            jiffies_to_msecs(orig_node->last_seen));
1286                 return true;
1287         }
1288         changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node);
1289         changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node);
1290
1291         if (!changed_ifinfo && !changed_neigh)
1292                 return false;
1293
1294         /* first for NULL ... */
1295         best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node,
1296                                                     BATADV_IF_DEFAULT);
1297         batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT,
1298                             best_neigh_node);
1299         if (best_neigh_node)
1300                 batadv_neigh_node_put(best_neigh_node);
1301
1302         /* ... then for all other interfaces. */
1303         rcu_read_lock();
1304         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1305                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1306                         continue;
1307
1308                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1309                         continue;
1310
1311                 if (!kref_get_unless_zero(&hard_iface->refcount))
1312                         continue;
1313
1314                 best_neigh_node = batadv_find_best_neighbor(bat_priv,
1315                                                             orig_node,
1316                                                             hard_iface);
1317                 batadv_update_route(bat_priv, orig_node, hard_iface,
1318                                     best_neigh_node);
1319                 if (best_neigh_node)
1320                         batadv_neigh_node_put(best_neigh_node);
1321
1322                 batadv_hardif_put(hard_iface);
1323         }
1324         rcu_read_unlock();
1325
1326         return false;
1327 }
1328
1329 /**
1330  * batadv_purge_orig_ref() - Purge all outdated originators
1331  * @bat_priv: the bat priv with all the soft interface information
1332  */
1333 void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
1334 {
1335         struct batadv_hashtable *hash = bat_priv->orig_hash;
1336         struct hlist_node *node_tmp;
1337         struct hlist_head *head;
1338         spinlock_t *list_lock; /* spinlock to protect write access */
1339         struct batadv_orig_node *orig_node;
1340         u32 i;
1341
1342         if (!hash)
1343                 return;
1344
1345         /* for all origins... */
1346         for (i = 0; i < hash->size; i++) {
1347                 head = &hash->table[i];
1348                 list_lock = &hash->list_locks[i];
1349
1350                 spin_lock_bh(list_lock);
1351                 hlist_for_each_entry_safe(orig_node, node_tmp,
1352                                           head, hash_entry) {
1353                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
1354                                 batadv_gw_node_delete(bat_priv, orig_node);
1355                                 hlist_del_rcu(&orig_node->hash_entry);
1356                                 batadv_tt_global_del_orig(orig_node->bat_priv,
1357                                                           orig_node, -1,
1358                                                           "originator timed out");
1359                                 batadv_orig_node_put(orig_node);
1360                                 continue;
1361                         }
1362
1363                         batadv_frag_purge_orig(orig_node,
1364                                                batadv_frag_check_entry);
1365                 }
1366                 spin_unlock_bh(list_lock);
1367         }
1368
1369         batadv_gw_election(bat_priv);
1370 }
1371
1372 static void batadv_purge_orig(struct work_struct *work)
1373 {
1374         struct delayed_work *delayed_work;
1375         struct batadv_priv *bat_priv;
1376
1377         delayed_work = to_delayed_work(work);
1378         bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
1379         batadv_purge_orig_ref(bat_priv);
1380         queue_delayed_work(batadv_event_workqueue,
1381                            &bat_priv->orig_work,
1382                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
1383 }
1384
1385 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
1386
1387 /**
1388  * batadv_orig_seq_print_text() - Print the originator table in a seq file
1389  * @seq: seq file to print on
1390  * @offset: not used
1391  *
1392  * Return: always 0
1393  */
1394 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
1395 {
1396         struct net_device *net_dev = (struct net_device *)seq->private;
1397         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1398         struct batadv_hard_iface *primary_if;
1399
1400         primary_if = batadv_seq_print_text_primary_if_get(seq);
1401         if (!primary_if)
1402                 return 0;
1403
1404         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
1405                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
1406                    primary_if->net_dev->dev_addr, net_dev->name,
1407                    bat_priv->algo_ops->name);
1408
1409         batadv_hardif_put(primary_if);
1410
1411         if (!bat_priv->algo_ops->orig.print) {
1412                 seq_puts(seq,
1413                          "No printing function for this routing protocol\n");
1414                 return 0;
1415         }
1416
1417         bat_priv->algo_ops->orig.print(bat_priv, seq, BATADV_IF_DEFAULT);
1418
1419         return 0;
1420 }
1421
1422 /**
1423  * batadv_orig_hardif_seq_print_text() - writes originator infos for a specific
1424  *  outgoing interface
1425  * @seq: debugfs table seq_file struct
1426  * @offset: not used
1427  *
1428  * Return: 0
1429  */
1430 int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset)
1431 {
1432         struct net_device *net_dev = (struct net_device *)seq->private;
1433         struct batadv_hard_iface *hard_iface;
1434         struct batadv_priv *bat_priv;
1435
1436         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1437
1438         if (!hard_iface || !hard_iface->soft_iface) {
1439                 seq_puts(seq, "Interface not known to B.A.T.M.A.N.\n");
1440                 goto out;
1441         }
1442
1443         bat_priv = netdev_priv(hard_iface->soft_iface);
1444         if (!bat_priv->algo_ops->orig.print) {
1445                 seq_puts(seq,
1446                          "No printing function for this routing protocol\n");
1447                 goto out;
1448         }
1449
1450         if (hard_iface->if_status != BATADV_IF_ACTIVE) {
1451                 seq_puts(seq, "Interface not active\n");
1452                 goto out;
1453         }
1454
1455         seq_printf(seq, "[B.A.T.M.A.N. adv %s, IF/MAC: %s/%pM (%s %s)]\n",
1456                    BATADV_SOURCE_VERSION, hard_iface->net_dev->name,
1457                    hard_iface->net_dev->dev_addr,
1458                    hard_iface->soft_iface->name, bat_priv->algo_ops->name);
1459
1460         bat_priv->algo_ops->orig.print(bat_priv, seq, hard_iface);
1461
1462 out:
1463         if (hard_iface)
1464                 batadv_hardif_put(hard_iface);
1465         return 0;
1466 }
1467 #endif
1468
1469 /**
1470  * batadv_orig_dump() - Dump to netlink the originator infos for a specific
1471  *  outgoing interface
1472  * @msg: message to dump into
1473  * @cb: parameters for the dump
1474  *
1475  * Return: 0 or error value
1476  */
1477 int batadv_orig_dump(struct sk_buff *msg, struct netlink_callback *cb)
1478 {
1479         struct net *net = sock_net(cb->skb->sk);
1480         struct net_device *soft_iface;
1481         struct net_device *hard_iface = NULL;
1482         struct batadv_hard_iface *hardif = BATADV_IF_DEFAULT;
1483         struct batadv_priv *bat_priv;
1484         struct batadv_hard_iface *primary_if = NULL;
1485         int ret;
1486         int ifindex, hard_ifindex;
1487
1488         ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
1489         if (!ifindex)
1490                 return -EINVAL;
1491
1492         soft_iface = dev_get_by_index(net, ifindex);
1493         if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
1494                 ret = -ENODEV;
1495                 goto out;
1496         }
1497
1498         bat_priv = netdev_priv(soft_iface);
1499
1500         primary_if = batadv_primary_if_get_selected(bat_priv);
1501         if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
1502                 ret = -ENOENT;
1503                 goto out;
1504         }
1505
1506         hard_ifindex = batadv_netlink_get_ifindex(cb->nlh,
1507                                                   BATADV_ATTR_HARD_IFINDEX);
1508         if (hard_ifindex) {
1509                 hard_iface = dev_get_by_index(net, hard_ifindex);
1510                 if (hard_iface)
1511                         hardif = batadv_hardif_get_by_netdev(hard_iface);
1512
1513                 if (!hardif) {
1514                         ret = -ENODEV;
1515                         goto out;
1516                 }
1517
1518                 if (hardif->soft_iface != soft_iface) {
1519                         ret = -ENOENT;
1520                         goto out;
1521                 }
1522         }
1523
1524         if (!bat_priv->algo_ops->orig.dump) {
1525                 ret = -EOPNOTSUPP;
1526                 goto out;
1527         }
1528
1529         bat_priv->algo_ops->orig.dump(msg, cb, bat_priv, hardif);
1530
1531         ret = msg->len;
1532
1533  out:
1534         if (hardif)
1535                 batadv_hardif_put(hardif);
1536         if (hard_iface)
1537                 dev_put(hard_iface);
1538         if (primary_if)
1539                 batadv_hardif_put(primary_if);
1540         if (soft_iface)
1541                 dev_put(soft_iface);
1542
1543         return ret;
1544 }