net/batman-adv/originator.c

   1 /* Copyright (C) 2009-2015 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "originator.h"
  19 #include "main.h"
  20
  21 #include <linux/errno.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/fs.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/kernel.h>
  26 #include <linux/list.h>
  27 #include <linux/lockdep.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/rculist.h>
  30 #include <linux/seq_file.h>
  31 #include <linux/slab.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/workqueue.h>
  34
  35 #include "distributed-arp-table.h"
  36 #include "fragmentation.h"
  37 #include "gateway_client.h"
  38 #include "hard-interface.h"
  39 #include "hash.h"
  40 #include "multicast.h"
  41 #include "network-coding.h"
  42 #include "routing.h"
  43 #include "translation-table.h"
  44
  45 /* hash class keys */
  46 static struct lock_class_key batadv_orig_hash_lock_class_key;
  47
  48 static void batadv_purge_orig(struct work_struct *work);
  49
  50 /* returns 1 if they are the same originator */
  51 int batadv_compare_orig(const struct hlist_node *node, const void *data2)
  52 {
  53         const void *data1 = container_of(node, struct batadv_orig_node,
  54                                          hash_entry);
  55
  56         return batadv_compare_eth(data1, data2);
  57 }
  58
  59 /**
  60  * batadv_orig_node_vlan_get - get an orig_node_vlan object
  61  * @orig_node: the originator serving the VLAN
  62  * @vid: the VLAN identifier
  63  *
  64  * Returns the vlan object identified by vid and belonging to orig_node or NULL
  65  * if it does not exist.
  66  */
  67 struct batadv_orig_node_vlan *
  68 batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
  69                           unsigned short vid)
  70 {
  71         struct batadv_orig_node_vlan *vlan = NULL, *tmp;
  72
  73         rcu_read_lock();
  74         hlist_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) {
  75                 if (tmp->vid != vid)
  76                         continue;
  77
  78                 if (!atomic_inc_not_zero(&tmp->refcount))
  79                         continue;
  80
  81                 vlan = tmp;
  82
  83                 break;
  84         }
  85         rcu_read_unlock();
  86
  87         return vlan;
  88 }
  89
  90 /**
  91  * batadv_orig_node_vlan_new - search and possibly create an orig_node_vlan
  92  *  object
  93  * @orig_node: the originator serving the VLAN
  94  * @vid: the VLAN identifier
  95  *
  96  * Returns NULL in case of failure or the vlan object identified by vid and
  97  * belonging to orig_node otherwise. The object is created and added to the list
  98  * if it does not exist.
  99  *
 100  * The object is returned with refcounter increased by 1.
 101  */
 102 struct batadv_orig_node_vlan *
 103 batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
 104                           unsigned short vid)
 105 {
 106         struct batadv_orig_node_vlan *vlan;
 107
 108         spin_lock_bh(&orig_node->vlan_list_lock);
 109
 110         /* first look if an object for this vid already exists */
 111         vlan = batadv_orig_node_vlan_get(orig_node, vid);
 112         if (vlan)
 113                 goto out;
 114
 115         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 116         if (!vlan)
 117                 goto out;
 118
 119         atomic_set(&vlan->refcount, 2);
 120         vlan->vid = vid;
 121
 122         hlist_add_head_rcu(&vlan->list, &orig_node->vlan_list);
 123
 124 out:
 125         spin_unlock_bh(&orig_node->vlan_list_lock);
 126
 127         return vlan;
 128 }
 129
 130 /**
 131  * batadv_orig_node_vlan_free_ref - decrement the refcounter and possibly free
 132  *  the originator-vlan object
 133  * @orig_vlan: the originator-vlan object to release
 134  */
 135 void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan)
 136 {
 137         if (atomic_dec_and_test(&orig_vlan->refcount))
 138                 kfree_rcu(orig_vlan, rcu);
 139 }
 140
 141 int batadv_originator_init(struct batadv_priv *bat_priv)
 142 {
 143         if (bat_priv->orig_hash)
 144                 return 0;
 145
 146         bat_priv->orig_hash = batadv_hash_new(1024);
 147
 148         if (!bat_priv->orig_hash)
 149                 goto err;
 150
 151         batadv_hash_set_lock_class(bat_priv->orig_hash,
 152                                    &batadv_orig_hash_lock_class_key);
 153
 154         INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig);
 155         queue_delayed_work(batadv_event_workqueue,
 156                            &bat_priv->orig_work,
 157                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 158
 159         return 0;
 160
 161 err:
 162         return -ENOMEM;
 163 }
 164
 165 /**
 166  * batadv_neigh_ifinfo_free_rcu - free the neigh_ifinfo object
 167  * @rcu: rcu pointer of the neigh_ifinfo object
 168  */
 169 static void batadv_neigh_ifinfo_free_rcu(struct rcu_head *rcu)
 170 {
 171         struct batadv_neigh_ifinfo *neigh_ifinfo;
 172
 173         neigh_ifinfo = container_of(rcu, struct batadv_neigh_ifinfo, rcu);
 174
 175         if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 176                 batadv_hardif_free_ref_now(neigh_ifinfo->if_outgoing);
 177
 178         kfree(neigh_ifinfo);
 179 }
 180
 181 /**
 182  * batadv_neigh_ifinfo_free_now - decrement the refcounter and possibly free
 183  *  the neigh_ifinfo (without rcu callback)
 184  * @neigh_ifinfo: the neigh_ifinfo object to release
 185  */
 186 static void
 187 batadv_neigh_ifinfo_free_ref_now(struct batadv_neigh_ifinfo *neigh_ifinfo)
 188 {
 189         if (atomic_dec_and_test(&neigh_ifinfo->refcount))
 190                 batadv_neigh_ifinfo_free_rcu(&neigh_ifinfo->rcu);
 191 }
 192
 193 /**
 194  * batadv_neigh_ifinfo_free_ref - decrement the refcounter and possibly free
 195  *  the neigh_ifinfo
 196  * @neigh_ifinfo: the neigh_ifinfo object to release
 197  */
 198 void batadv_neigh_ifinfo_free_ref(struct batadv_neigh_ifinfo *neigh_ifinfo)
 199 {
 200         if (atomic_dec_and_test(&neigh_ifinfo->refcount))
 201                 call_rcu(&neigh_ifinfo->rcu, batadv_neigh_ifinfo_free_rcu);
 202 }
 203
 204 /**
 205  * batadv_hardif_neigh_free_rcu - free the hardif neigh_node
 206  * @rcu: rcu pointer of the neigh_node
 207  */
 208 static void batadv_hardif_neigh_free_rcu(struct rcu_head *rcu)
 209 {
 210         struct batadv_hardif_neigh_node *hardif_neigh;
 211
 212         hardif_neigh = container_of(rcu, struct batadv_hardif_neigh_node, rcu);
 213
 214         batadv_hardif_free_ref_now(hardif_neigh->if_incoming);
 215         kfree(hardif_neigh);
 216 }
 217
 218 /**
 219  * batadv_hardif_neigh_free_now - decrement the hardif neighbors refcounter
 220  *  and possibly free it (without rcu callback)
 221  * @hardif_neigh: hardif neigh neighbor to free
 222  */
 223 static void
 224 batadv_hardif_neigh_free_now(struct batadv_hardif_neigh_node *hardif_neigh)
 225 {
 226         if (atomic_dec_and_test(&hardif_neigh->refcount)) {
 227                 spin_lock_bh(&hardif_neigh->if_incoming->neigh_list_lock);
 228                 hlist_del_init_rcu(&hardif_neigh->list);
 229                 spin_unlock_bh(&hardif_neigh->if_incoming->neigh_list_lock);
 230
 231                 batadv_hardif_neigh_free_rcu(&hardif_neigh->rcu);
 232         }
 233 }
 234
 235 /**
 236  * batadv_hardif_neigh_free_ref - decrement the hardif neighbors refcounter
 237  *  and possibly free it
 238  * @hardif_neigh: hardif neigh neighbor to free
 239  */
 240 void batadv_hardif_neigh_free_ref(struct batadv_hardif_neigh_node *hardif_neigh)
 241 {
 242         if (atomic_dec_and_test(&hardif_neigh->refcount)) {
 243                 spin_lock_bh(&hardif_neigh->if_incoming->neigh_list_lock);
 244                 hlist_del_init_rcu(&hardif_neigh->list);
 245                 spin_unlock_bh(&hardif_neigh->if_incoming->neigh_list_lock);
 246
 247                 call_rcu(&hardif_neigh->rcu, batadv_hardif_neigh_free_rcu);
 248         }
 249 }
 250
 251 /**
 252  * batadv_neigh_node_free_rcu - free the neigh_node
 253  * @rcu: rcu pointer of the neigh_node
 254  */
 255 static void batadv_neigh_node_free_rcu(struct rcu_head *rcu)
 256 {
 257         struct hlist_node *node_tmp;
 258         struct batadv_neigh_node *neigh_node;
 259         struct batadv_hardif_neigh_node *hardif_neigh;
 260         struct batadv_neigh_ifinfo *neigh_ifinfo;
 261         struct batadv_algo_ops *bao;
 262
 263         neigh_node = container_of(rcu, struct batadv_neigh_node, rcu);
 264         bao = neigh_node->orig_node->bat_priv->bat_algo_ops;
 265
 266         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
 267                                   &neigh_node->ifinfo_list, list) {
 268                 batadv_neigh_ifinfo_free_ref_now(neigh_ifinfo);
 269         }
 270
 271         hardif_neigh = batadv_hardif_neigh_get(neigh_node->if_incoming,
 272                                                neigh_node->addr);
 273         if (hardif_neigh) {
 274                 /* batadv_hardif_neigh_get() increases refcount too */
 275                 batadv_hardif_neigh_free_now(hardif_neigh);
 276                 batadv_hardif_neigh_free_now(hardif_neigh);
 277         }
 278
 279         if (bao->bat_neigh_free)
 280                 bao->bat_neigh_free(neigh_node);
 281
 282         batadv_hardif_free_ref_now(neigh_node->if_incoming);
 283
 284         kfree(neigh_node);
 285 }
 286
 287 /**
 288  * batadv_neigh_node_free_ref - decrement the neighbors refcounter
 289  *  and possibly release it
 290  * @neigh_node: neigh neighbor to free
 291  */
 292 void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node)
 293 {
 294         if (atomic_dec_and_test(&neigh_node->refcount))
 295                 call_rcu(&neigh_node->rcu, batadv_neigh_node_free_rcu);
 296 }
 297
 298 /**
 299  * batadv_orig_node_get_router - router to the originator depending on iface
 300  * @orig_node: the orig node for the router
 301  * @if_outgoing: the interface where the payload packet has been received or
 302  *  the OGM should be sent to
 303  *
 304  * Returns the neighbor which should be router for this orig_node/iface.
 305  *
 306  * The object is returned with refcounter increased by 1.
 307  */
 308 struct batadv_neigh_node *
 309 batadv_orig_router_get(struct batadv_orig_node *orig_node,
 310                        const struct batadv_hard_iface *if_outgoing)
 311 {
 312         struct batadv_orig_ifinfo *orig_ifinfo;
 313         struct batadv_neigh_node *router = NULL;
 314
 315         rcu_read_lock();
 316         hlist_for_each_entry_rcu(orig_ifinfo, &orig_node->ifinfo_list, list) {
 317                 if (orig_ifinfo->if_outgoing != if_outgoing)
 318                         continue;
 319
 320                 router = rcu_dereference(orig_ifinfo->router);
 321                 break;
 322         }
 323
 324         if (router && !atomic_inc_not_zero(&router->refcount))
 325                 router = NULL;
 326
 327         rcu_read_unlock();
 328         return router;
 329 }
 330
 331 /**
 332  * batadv_orig_ifinfo_get - find the ifinfo from an orig_node
 333  * @orig_node: the orig node to be queried
 334  * @if_outgoing: the interface for which the ifinfo should be acquired
 335  *
 336  * Returns the requested orig_ifinfo or NULL if not found.
 337  *
 338  * The object is returned with refcounter increased by 1.
 339  */
 340 struct batadv_orig_ifinfo *
 341 batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node,
 342                        struct batadv_hard_iface *if_outgoing)
 343 {
 344         struct batadv_orig_ifinfo *tmp, *orig_ifinfo = NULL;
 345
 346         rcu_read_lock();
 347         hlist_for_each_entry_rcu(tmp, &orig_node->ifinfo_list,
 348                                  list) {
 349                 if (tmp->if_outgoing != if_outgoing)
 350                         continue;
 351
 352                 if (!atomic_inc_not_zero(&tmp->refcount))
 353                         continue;
 354
 355                 orig_ifinfo = tmp;
 356                 break;
 357         }
 358         rcu_read_unlock();
 359
 360         return orig_ifinfo;
 361 }
 362
 363 /**
 364  * batadv_orig_ifinfo_new - search and possibly create an orig_ifinfo object
 365  * @orig_node: the orig node to be queried
 366  * @if_outgoing: the interface for which the ifinfo should be acquired
 367  *
 368  * Returns NULL in case of failure or the orig_ifinfo object for the if_outgoing
 369  * interface otherwise. The object is created and added to the list
 370  * if it does not exist.
 371  *
 372  * The object is returned with refcounter increased by 1.
 373  */
 374 struct batadv_orig_ifinfo *
 375 batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node,
 376                        struct batadv_hard_iface *if_outgoing)
 377 {
 378         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
 379         unsigned long reset_time;
 380
 381         spin_lock_bh(&orig_node->neigh_list_lock);
 382
 383         orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing);
 384         if (orig_ifinfo)
 385                 goto out;
 386
 387         orig_ifinfo = kzalloc(sizeof(*orig_ifinfo), GFP_ATOMIC);
 388         if (!orig_ifinfo)
 389                 goto out;
 390
 391         if (if_outgoing != BATADV_IF_DEFAULT &&
 392             !atomic_inc_not_zero(&if_outgoing->refcount)) {
 393                 kfree(orig_ifinfo);
 394                 orig_ifinfo = NULL;
 395                 goto out;
 396         }
 397
 398         reset_time = jiffies - 1;
 399         reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 400         orig_ifinfo->batman_seqno_reset = reset_time;
 401         orig_ifinfo->if_outgoing = if_outgoing;
 402         INIT_HLIST_NODE(&orig_ifinfo->list);
 403         atomic_set(&orig_ifinfo->refcount, 2);
 404         hlist_add_head_rcu(&orig_ifinfo->list,
 405                            &orig_node->ifinfo_list);
 406 out:
 407         spin_unlock_bh(&orig_node->neigh_list_lock);
 408         return orig_ifinfo;
 409 }
 410
 411 /**
 412  * batadv_neigh_ifinfo_get - find the ifinfo from an neigh_node
 413  * @neigh_node: the neigh node to be queried
 414  * @if_outgoing: the interface for which the ifinfo should be acquired
 415  *
 416  * The object is returned with refcounter increased by 1.
 417  *
 418  * Returns the requested neigh_ifinfo or NULL if not found
 419  */
 420 struct batadv_neigh_ifinfo *
 421 batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh,
 422                         struct batadv_hard_iface *if_outgoing)
 423 {
 424         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL,
 425                                    *tmp_neigh_ifinfo;
 426
 427         rcu_read_lock();
 428         hlist_for_each_entry_rcu(tmp_neigh_ifinfo, &neigh->ifinfo_list,
 429                                  list) {
 430                 if (tmp_neigh_ifinfo->if_outgoing != if_outgoing)
 431                         continue;
 432
 433                 if (!atomic_inc_not_zero(&tmp_neigh_ifinfo->refcount))
 434                         continue;
 435
 436                 neigh_ifinfo = tmp_neigh_ifinfo;
 437                 break;
 438         }
 439         rcu_read_unlock();
 440
 441         return neigh_ifinfo;
 442 }
 443
 444 /**
 445  * batadv_neigh_ifinfo_new - search and possibly create an neigh_ifinfo object
 446  * @neigh_node: the neigh node to be queried
 447  * @if_outgoing: the interface for which the ifinfo should be acquired
 448  *
 449  * Returns NULL in case of failure or the neigh_ifinfo object for the
 450  * if_outgoing interface otherwise. The object is created and added to the list
 451  * if it does not exist.
 452  *
 453  * The object is returned with refcounter increased by 1.
 454  */
 455 struct batadv_neigh_ifinfo *
 456 batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh,
 457                         struct batadv_hard_iface *if_outgoing)
 458 {
 459         struct batadv_neigh_ifinfo *neigh_ifinfo;
 460
 461         spin_lock_bh(&neigh->ifinfo_lock);
 462
 463         neigh_ifinfo = batadv_neigh_ifinfo_get(neigh, if_outgoing);
 464         if (neigh_ifinfo)
 465                 goto out;
 466
 467         neigh_ifinfo = kzalloc(sizeof(*neigh_ifinfo), GFP_ATOMIC);
 468         if (!neigh_ifinfo)
 469                 goto out;
 470
 471         if (if_outgoing && !atomic_inc_not_zero(&if_outgoing->refcount)) {
 472                 kfree(neigh_ifinfo);
 473                 neigh_ifinfo = NULL;
 474                 goto out;
 475         }
 476
 477         INIT_HLIST_NODE(&neigh_ifinfo->list);
 478         atomic_set(&neigh_ifinfo->refcount, 2);
 479         neigh_ifinfo->if_outgoing = if_outgoing;
 480
 481         hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list);
 482
 483 out:
 484         spin_unlock_bh(&neigh->ifinfo_lock);
 485
 486         return neigh_ifinfo;
 487 }
 488
 489 /**
 490  * batadv_neigh_node_get - retrieve a neighbour from the list
 491  * @orig_node: originator which the neighbour belongs to
 492  * @hard_iface: the interface where this neighbour is connected to
 493  * @addr: the address of the neighbour
 494  *
 495  * Looks for and possibly returns a neighbour belonging to this originator list
 496  * which is connected through the provided hard interface.
 497  * Returns NULL if the neighbour is not found.
 498  */
 499 static struct batadv_neigh_node *
 500 batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
 501                       const struct batadv_hard_iface *hard_iface,
 502                       const u8 *addr)
 503 {
 504         struct batadv_neigh_node *tmp_neigh_node, *res = NULL;
 505
 506         rcu_read_lock();
 507         hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) {
 508                 if (!batadv_compare_eth(tmp_neigh_node->addr, addr))
 509                         continue;
 510
 511                 if (tmp_neigh_node->if_incoming != hard_iface)
 512                         continue;
 513
 514                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 515                         continue;
 516
 517                 res = tmp_neigh_node;
 518                 break;
 519         }
 520         rcu_read_unlock();
 521
 522         return res;
 523 }
 524
 525 /**
 526  * batadv_hardif_neigh_create - create a hardif neighbour node
 527  * @hard_iface: the interface this neighbour is connected to
 528  * @neigh_addr: the interface address of the neighbour to retrieve
 529  *
 530  * Returns the hardif neighbour node if found or created or NULL otherwise.
 531  */
 532 static struct batadv_hardif_neigh_node *
 533 batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface,
 534                            const u8 *neigh_addr)
 535 {
 536         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 537         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
 538
 539         spin_lock_bh(&hard_iface->neigh_list_lock);
 540
 541         /* check if neighbor hasn't been added in the meantime */
 542         hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr);
 543         if (hardif_neigh)
 544                 goto out;
 545
 546         if (!atomic_inc_not_zero(&hard_iface->refcount))
 547                 goto out;
 548
 549         hardif_neigh = kzalloc(sizeof(*hardif_neigh), GFP_ATOMIC);
 550         if (!hardif_neigh) {
 551                 batadv_hardif_free_ref(hard_iface);
 552                 goto out;
 553         }
 554
 555         INIT_HLIST_NODE(&hardif_neigh->list);
 556         ether_addr_copy(hardif_neigh->addr, neigh_addr);
 557         hardif_neigh->if_incoming = hard_iface;
 558         hardif_neigh->last_seen = jiffies;
 559
 560         atomic_set(&hardif_neigh->refcount, 1);
 561
 562         if (bat_priv->bat_algo_ops->bat_hardif_neigh_init)
 563                 bat_priv->bat_algo_ops->bat_hardif_neigh_init(hardif_neigh);
 564
 565         hlist_add_head(&hardif_neigh->list, &hard_iface->neigh_list);
 566
 567 out:
 568         spin_unlock_bh(&hard_iface->neigh_list_lock);
 569         return hardif_neigh;
 570 }
 571
 572 /**
 573  * batadv_hardif_neigh_get_or_create - retrieve or create a hardif neighbour
 574  *  node
 575  * @hard_iface: the interface this neighbour is connected to
 576  * @neigh_addr: the interface address of the neighbour to retrieve
 577  *
 578  * Returns the hardif neighbour node if found or created or NULL otherwise.
 579  */
 580 static struct batadv_hardif_neigh_node *
 581 batadv_hardif_neigh_get_or_create(struct batadv_hard_iface *hard_iface,
 582                                   const u8 *neigh_addr)
 583 {
 584         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
 585
 586         /* first check without locking to avoid the overhead */
 587         hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr);
 588         if (hardif_neigh)
 589                 return hardif_neigh;
 590
 591         return batadv_hardif_neigh_create(hard_iface, neigh_addr);
 592 }
 593
 594 /**
 595  * batadv_hardif_neigh_get - retrieve a hardif neighbour from the list
 596  * @hard_iface: the interface where this neighbour is connected to
 597  * @neigh_addr: the address of the neighbour
 598  *
 599  * Looks for and possibly returns a neighbour belonging to this hard interface.
 600  * Returns NULL if the neighbour is not found.
 601  */
 602 struct batadv_hardif_neigh_node *
 603 batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface,
 604                         const u8 *neigh_addr)
 605 {
 606         struct batadv_hardif_neigh_node *tmp_hardif_neigh, *hardif_neigh = NULL;
 607
 608         rcu_read_lock();
 609         hlist_for_each_entry_rcu(tmp_hardif_neigh,
 610                                  &hard_iface->neigh_list, list) {
 611                 if (!batadv_compare_eth(tmp_hardif_neigh->addr, neigh_addr))
 612                         continue;
 613
 614                 if (!atomic_inc_not_zero(&tmp_hardif_neigh->refcount))
 615                         continue;
 616
 617                 hardif_neigh = tmp_hardif_neigh;
 618                 break;
 619         }
 620         rcu_read_unlock();
 621
 622         return hardif_neigh;
 623 }
 624
 625 /**
 626  * batadv_neigh_node_new - create and init a new neigh_node object
 627  * @orig_node: originator object representing the neighbour
 628  * @hard_iface: the interface where the neighbour is connected to
 629  * @neigh_addr: the mac address of the neighbour interface
 630  *
 631  * Allocates a new neigh_node object and initialises all the generic fields.
 632  * Returns the new object or NULL on failure.
 633  */
 634 struct batadv_neigh_node *
 635 batadv_neigh_node_new(struct batadv_orig_node *orig_node,
 636                       struct batadv_hard_iface *hard_iface,
 637                       const u8 *neigh_addr)
 638 {
 639         struct batadv_neigh_node *neigh_node;
 640         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
 641
 642         neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr);
 643         if (neigh_node)
 644                 goto out;
 645
 646         hardif_neigh = batadv_hardif_neigh_get_or_create(hard_iface,
 647                                                          neigh_addr);
 648         if (!hardif_neigh)
 649                 goto out;
 650
 651         neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
 652         if (!neigh_node)
 653                 goto out;
 654
 655         if (!atomic_inc_not_zero(&hard_iface->refcount)) {
 656                 kfree(neigh_node);
 657                 neigh_node = NULL;
 658                 goto out;
 659         }
 660
 661         INIT_HLIST_NODE(&neigh_node->list);
 662         INIT_HLIST_HEAD(&neigh_node->ifinfo_list);
 663         spin_lock_init(&neigh_node->ifinfo_lock);
 664
 665         ether_addr_copy(neigh_node->addr, neigh_addr);
 666         neigh_node->if_incoming = hard_iface;
 667         neigh_node->orig_node = orig_node;
 668
 669         /* extra reference for return */
 670         atomic_set(&neigh_node->refcount, 2);
 671
 672         spin_lock_bh(&orig_node->neigh_list_lock);
 673         hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
 674         spin_unlock_bh(&orig_node->neigh_list_lock);
 675
 676         /* increment unique neighbor refcount */
 677         atomic_inc(&hardif_neigh->refcount);
 678
 679         batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv,
 680                    "Creating new neighbor %pM for orig_node %pM on interface %s\n",
 681                    neigh_addr, orig_node->orig, hard_iface->net_dev->name);
 682
 683 out:
 684         if (hardif_neigh)
 685                 batadv_hardif_neigh_free_ref(hardif_neigh);
 686         return neigh_node;
 687 }
 688
 689 /**
 690  * batadv_hardif_neigh_seq_print_text - print the single hop neighbour list
 691  * @seq: neighbour table seq_file struct
 692  * @offset: not used
 693  *
 694  * Always returns 0.
 695  */
 696 int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset)
 697 {
 698         struct net_device *net_dev = (struct net_device *)seq->private;
 699         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 700         struct batadv_hard_iface *primary_if;
 701
 702         primary_if = batadv_seq_print_text_primary_if_get(seq);
 703         if (!primary_if)
 704                 return 0;
 705
 706         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
 707                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
 708                    primary_if->net_dev->dev_addr, net_dev->name,
 709                    bat_priv->bat_algo_ops->name);
 710
 711         batadv_hardif_free_ref(primary_if);
 712
 713         if (!bat_priv->bat_algo_ops->bat_neigh_print) {
 714                 seq_puts(seq,
 715                          "No printing function for this routing protocol\n");
 716                 return 0;
 717         }
 718
 719         bat_priv->bat_algo_ops->bat_neigh_print(bat_priv, seq);
 720         return 0;
 721 }
 722
 723 /**
 724  * batadv_orig_ifinfo_release - release orig_ifinfo from lists and queue for
 725  *  free after rcu grace period
 726  * @orig_ifinfo: the orig_ifinfo object to release
 727  */
 728 static void batadv_orig_ifinfo_release(struct batadv_orig_ifinfo *orig_ifinfo)
 729 {
 730         struct batadv_neigh_node *router;
 731
 732         if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 733                 batadv_hardif_free_ref(orig_ifinfo->if_outgoing);
 734
 735         /* this is the last reference to this object */
 736         router = rcu_dereference_protected(orig_ifinfo->router, true);
 737         if (router)
 738                 batadv_neigh_node_free_ref(router);
 739
 740         kfree_rcu(orig_ifinfo, rcu);
 741 }
 742
 743 /**
 744  * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly release
 745  *  the orig_ifinfo
 746  * @orig_ifinfo: the orig_ifinfo object to release
 747  */
 748 void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo)
 749 {
 750         if (atomic_dec_and_test(&orig_ifinfo->refcount))
 751                 batadv_orig_ifinfo_release(orig_ifinfo);
 752 }
 753
 754 /**
 755  * batadv_orig_node_free_rcu - free the orig_node
 756  * @rcu: rcu pointer of the orig_node
 757  */
 758 static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 759 {
 760         struct batadv_orig_node *orig_node;
 761
 762         orig_node = container_of(rcu, struct batadv_orig_node, rcu);
 763
 764         batadv_mcast_purge_orig(orig_node);
 765
 766         batadv_frag_purge_orig(orig_node, NULL);
 767
 768         if (orig_node->bat_priv->bat_algo_ops->bat_orig_free)
 769                 orig_node->bat_priv->bat_algo_ops->bat_orig_free(orig_node);
 770
 771         kfree(orig_node->tt_buff);
 772         kfree(orig_node);
 773 }
 774
 775 /**
 776  * batadv_orig_node_release - release orig_node from lists and queue for
 777  *  free after rcu grace period
 778  * @orig_node: the orig node to free
 779  */
 780 static void batadv_orig_node_release(struct batadv_orig_node *orig_node)
 781 {
 782         struct hlist_node *node_tmp;
 783         struct batadv_neigh_node *neigh_node;
 784         struct batadv_orig_ifinfo *orig_ifinfo;
 785
 786         spin_lock_bh(&orig_node->neigh_list_lock);
 787
 788         /* for all neighbors towards this originator ... */
 789         hlist_for_each_entry_safe(neigh_node, node_tmp,
 790                                   &orig_node->neigh_list, list) {
 791                 hlist_del_rcu(&neigh_node->list);
 792                 batadv_neigh_node_free_ref(neigh_node);
 793         }
 794
 795         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 796                                   &orig_node->ifinfo_list, list) {
 797                 hlist_del_rcu(&orig_ifinfo->list);
 798                 batadv_orig_ifinfo_free_ref(orig_ifinfo);
 799         }
 800         spin_unlock_bh(&orig_node->neigh_list_lock);
 801
 802         /* Free nc_nodes */
 803         batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 804
 805         call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
 806 }
 807
 808 /**
 809  * batadv_orig_node_free_ref - decrement the orig node refcounter and possibly
 810  *  release it
 811  * @orig_node: the orig node to free
 812  */
 813 void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
 814 {
 815         if (atomic_dec_and_test(&orig_node->refcount))
 816                 batadv_orig_node_release(orig_node);
 817 }
 818
 819 /**
 820  * batadv_orig_node_free_ref_now - decrement the orig node refcounter and
 821  * possibly free it (without rcu callback)
 822  * @orig_node: the orig node to free
 823  */
 824 void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node)
 825 {
 826         if (atomic_dec_and_test(&orig_node->refcount))
 827                 batadv_orig_node_free_rcu(&orig_node->rcu);
 828 }
 829
 830 void batadv_originator_free(struct batadv_priv *bat_priv)
 831 {
 832         struct batadv_hashtable *hash = bat_priv->orig_hash;
 833         struct hlist_node *node_tmp;
 834         struct hlist_head *head;
 835         spinlock_t *list_lock; /* spinlock to protect write access */
 836         struct batadv_orig_node *orig_node;
 837         u32 i;
 838
 839         if (!hash)
 840                 return;
 841
 842         cancel_delayed_work_sync(&bat_priv->orig_work);
 843
 844         bat_priv->orig_hash = NULL;
 845
 846         for (i = 0; i < hash->size; i++) {
 847                 head = &hash->table[i];
 848                 list_lock = &hash->list_locks[i];
 849
 850                 spin_lock_bh(list_lock);
 851                 hlist_for_each_entry_safe(orig_node, node_tmp,
 852                                           head, hash_entry) {
 853                         hlist_del_rcu(&orig_node->hash_entry);
 854                         batadv_orig_node_free_ref(orig_node);
 855                 }
 856                 spin_unlock_bh(list_lock);
 857         }
 858
 859         batadv_hash_destroy(hash);
 860 }
 861
 862 /**
 863  * batadv_orig_node_new - creates a new orig_node
 864  * @bat_priv: the bat priv with all the soft interface information
 865  * @addr: the mac address of the originator
 866  *
 867  * Creates a new originator object and initialise all the generic fields.
 868  * The new object is not added to the originator list.
 869  * Returns the newly created object or NULL on failure.
 870  */
 871 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
 872                                               const u8 *addr)
 873 {
 874         struct batadv_orig_node *orig_node;
 875         struct batadv_orig_node_vlan *vlan;
 876         unsigned long reset_time;
 877         int i;
 878
 879         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 880                    "Creating new originator: %pM\n", addr);
 881
 882         orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
 883         if (!orig_node)
 884                 return NULL;
 885
 886         INIT_HLIST_HEAD(&orig_node->neigh_list);
 887         INIT_HLIST_HEAD(&orig_node->vlan_list);
 888         INIT_HLIST_HEAD(&orig_node->ifinfo_list);
 889         spin_lock_init(&orig_node->bcast_seqno_lock);
 890         spin_lock_init(&orig_node->neigh_list_lock);
 891         spin_lock_init(&orig_node->tt_buff_lock);
 892         spin_lock_init(&orig_node->tt_lock);
 893         spin_lock_init(&orig_node->vlan_list_lock);
 894
 895         batadv_nc_init_orig(orig_node);
 896
 897         /* extra reference for return */
 898         atomic_set(&orig_node->refcount, 2);
 899
 900         orig_node->bat_priv = bat_priv;
 901         ether_addr_copy(orig_node->orig, addr);
 902         batadv_dat_init_orig_node_addr(orig_node);
 903         atomic_set(&orig_node->last_ttvn, 0);
 904         orig_node->tt_buff = NULL;
 905         orig_node->tt_buff_len = 0;
 906         orig_node->last_seen = jiffies;
 907         reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 908         orig_node->bcast_seqno_reset = reset_time;
 909
 910 #ifdef CONFIG_BATMAN_ADV_MCAST
 911         orig_node->mcast_flags = BATADV_NO_FLAGS;
 912         INIT_HLIST_NODE(&orig_node->mcast_want_all_unsnoopables_node);
 913         INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv4_node);
 914         INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv6_node);
 915         spin_lock_init(&orig_node->mcast_handler_lock);
 916 #endif
 917
 918         /* create a vlan object for the "untagged" LAN */
 919         vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);
 920         if (!vlan)
 921                 goto free_orig_node;
 922         /* batadv_orig_node_vlan_new() increases the refcounter.
 923          * Immediately release vlan since it is not needed anymore in this
 924          * context
 925          */
 926         batadv_orig_node_vlan_free_ref(vlan);
 927
 928         for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
 929                 INIT_HLIST_HEAD(&orig_node->fragments[i].head);
 930                 spin_lock_init(&orig_node->fragments[i].lock);
 931                 orig_node->fragments[i].size = 0;
 932         }
 933
 934         return orig_node;
 935 free_orig_node:
 936         kfree(orig_node);
 937         return NULL;
 938 }
 939
 940 /**
 941  * batadv_purge_neigh_ifinfo - purge obsolete ifinfo entries from neighbor
 942  * @bat_priv: the bat priv with all the soft interface information
 943  * @neigh: orig node which is to be checked
 944  */
 945 static void
 946 batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv,
 947                           struct batadv_neigh_node *neigh)
 948 {
 949         struct batadv_neigh_ifinfo *neigh_ifinfo;
 950         struct batadv_hard_iface *if_outgoing;
 951         struct hlist_node *node_tmp;
 952
 953         spin_lock_bh(&neigh->ifinfo_lock);
 954
 955         /* for all ifinfo objects for this neighinator */
 956         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
 957                                   &neigh->ifinfo_list, list) {
 958                 if_outgoing = neigh_ifinfo->if_outgoing;
 959
 960                 /* always keep the default interface */
 961                 if (if_outgoing == BATADV_IF_DEFAULT)
 962                         continue;
 963
 964                 /* don't purge if the interface is not (going) down */
 965                 if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
 966                     (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
 967                     (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
 968                         continue;
 969
 970                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 971                            "neighbor/ifinfo purge: neighbor %pM, iface: %s\n",
 972                            neigh->addr, if_outgoing->net_dev->name);
 973
 974                 hlist_del_rcu(&neigh_ifinfo->list);
 975                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
 976         }
 977
 978         spin_unlock_bh(&neigh->ifinfo_lock);
 979 }
 980
 981 /**
 982  * batadv_purge_orig_ifinfo - purge obsolete ifinfo entries from originator
 983  * @bat_priv: the bat priv with all the soft interface information
 984  * @orig_node: orig node which is to be checked
 985  *
 986  * Returns true if any ifinfo entry was purged, false otherwise.
 987  */
 988 static bool
 989 batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv,
 990                          struct batadv_orig_node *orig_node)
 991 {
 992         struct batadv_orig_ifinfo *orig_ifinfo;
 993         struct batadv_hard_iface *if_outgoing;
 994         struct hlist_node *node_tmp;
 995         bool ifinfo_purged = false;
 996
 997         spin_lock_bh(&orig_node->neigh_list_lock);
 998
 999         /* for all ifinfo objects for this originator */
1000         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
1001                                   &orig_node->ifinfo_list, list) {
1002                 if_outgoing = orig_ifinfo->if_outgoing;
1003
1004                 /* always keep the default interface */
1005                 if (if_outgoing == BATADV_IF_DEFAULT)
1006                         continue;
1007
1008                 /* don't purge if the interface is not (going) down */
1009                 if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
1010                     (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
1011                     (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
1012                         continue;
1013
1014                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1015                            "router/ifinfo purge: originator %pM, iface: %s\n",
1016                            orig_node->orig, if_outgoing->net_dev->name);
1017
1018                 ifinfo_purged = true;
1019
1020                 hlist_del_rcu(&orig_ifinfo->list);
1021                 batadv_orig_ifinfo_free_ref(orig_ifinfo);
1022                 if (orig_node->last_bonding_candidate == orig_ifinfo) {
1023                         orig_node->last_bonding_candidate = NULL;
1024                         batadv_orig_ifinfo_free_ref(orig_ifinfo);
1025                 }
1026         }
1027
1028         spin_unlock_bh(&orig_node->neigh_list_lock);
1029
1030         return ifinfo_purged;
1031 }
1032
1033 /**
1034  * batadv_purge_orig_neighbors - purges neighbors from originator
1035  * @bat_priv: the bat priv with all the soft interface information
1036  * @orig_node: orig node which is to be checked
1037  *
1038  * Returns true if any neighbor was purged, false otherwise
1039  */
1040 static bool
1041 batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
1042                             struct batadv_orig_node *orig_node)
1043 {
1044         struct hlist_node *node_tmp;
1045         struct batadv_neigh_node *neigh_node;
1046         bool neigh_purged = false;
1047         unsigned long last_seen;
1048         struct batadv_hard_iface *if_incoming;
1049
1050         spin_lock_bh(&orig_node->neigh_list_lock);
1051
1052         /* for all neighbors towards this originator ... */
1053         hlist_for_each_entry_safe(neigh_node, node_tmp,
1054                                   &orig_node->neigh_list, list) {
1055                 last_seen = neigh_node->last_seen;
1056                 if_incoming = neigh_node->if_incoming;
1057
1058                 if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) ||
1059                     (if_incoming->if_status == BATADV_IF_INACTIVE) ||
1060                     (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
1061                     (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) {
1062                         if ((if_incoming->if_status == BATADV_IF_INACTIVE) ||
1063                             (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
1064                             (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED))
1065                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1066                                            "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
1067                                            orig_node->orig, neigh_node->addr,
1068                                            if_incoming->net_dev->name);
1069                         else
1070                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1071                                            "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
1072                                            orig_node->orig, neigh_node->addr,
1073                                            jiffies_to_msecs(last_seen));
1074
1075                         neigh_purged = true;
1076
1077                         hlist_del_rcu(&neigh_node->list);
1078                         batadv_neigh_node_free_ref(neigh_node);
1079                 } else {
1080                         /* only necessary if not the whole neighbor is to be
1081                          * deleted, but some interface has been removed.
1082                          */
1083                         batadv_purge_neigh_ifinfo(bat_priv, neigh_node);
1084                 }
1085         }
1086
1087         spin_unlock_bh(&orig_node->neigh_list_lock);
1088         return neigh_purged;
1089 }
1090
1091 /**
1092  * batadv_find_best_neighbor - finds the best neighbor after purging
1093  * @bat_priv: the bat priv with all the soft interface information
1094  * @orig_node: orig node which is to be checked
1095  * @if_outgoing: the interface for which the metric should be compared
1096  *
1097  * Returns the current best neighbor, with refcount increased.
1098  */
1099 static struct batadv_neigh_node *
1100 batadv_find_best_neighbor(struct batadv_priv *bat_priv,
1101                           struct batadv_orig_node *orig_node,
1102                           struct batadv_hard_iface *if_outgoing)
1103 {
1104         struct batadv_neigh_node *best = NULL, *neigh;
1105         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1106
1107         rcu_read_lock();
1108         hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) {
1109                 if (best && (bao->bat_neigh_cmp(neigh, if_outgoing,
1110                                                 best, if_outgoing) <= 0))
1111                         continue;
1112
1113                 if (!atomic_inc_not_zero(&neigh->refcount))
1114                         continue;
1115
1116                 if (best)
1117                         batadv_neigh_node_free_ref(best);
1118
1119                 best = neigh;
1120         }
1121         rcu_read_unlock();
1122
1123         return best;
1124 }
1125
1126 /**
1127  * batadv_purge_orig_node - purges obsolete information from an orig_node
1128  * @bat_priv: the bat priv with all the soft interface information
1129  * @orig_node: orig node which is to be checked
1130  *
1131  * This function checks if the orig_node or substructures of it have become
1132  * obsolete, and purges this information if that's the case.
1133  *
1134  * Returns true if the orig_node is to be removed, false otherwise.
1135  */
1136 static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
1137                                    struct batadv_orig_node *orig_node)
1138 {
1139         struct batadv_neigh_node *best_neigh_node;
1140         struct batadv_hard_iface *hard_iface;
1141         bool changed_ifinfo, changed_neigh;
1142
1143         if (batadv_has_timed_out(orig_node->last_seen,
1144                                  2 * BATADV_PURGE_TIMEOUT)) {
1145                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1146                            "Originator timeout: originator %pM, last_seen %u\n",
1147                            orig_node->orig,
1148                            jiffies_to_msecs(orig_node->last_seen));
1149                 return true;
1150         }
1151         changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node);
1152         changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node);
1153
1154         if (!changed_ifinfo && !changed_neigh)
1155                 return false;
1156
1157         /* first for NULL ... */
1158         best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node,
1159                                                     BATADV_IF_DEFAULT);
1160         batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT,
1161                             best_neigh_node);
1162         if (best_neigh_node)
1163                 batadv_neigh_node_free_ref(best_neigh_node);
1164
1165         /* ... then for all other interfaces. */
1166         rcu_read_lock();
1167         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1168                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1169                         continue;
1170
1171                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1172                         continue;
1173
1174                 best_neigh_node = batadv_find_best_neighbor(bat_priv,
1175                                                             orig_node,
1176                                                             hard_iface);
1177                 batadv_update_route(bat_priv, orig_node, hard_iface,
1178                                     best_neigh_node);
1179                 if (best_neigh_node)
1180                         batadv_neigh_node_free_ref(best_neigh_node);
1181         }
1182         rcu_read_unlock();
1183
1184         return false;
1185 }
1186
1187 static void _batadv_purge_orig(struct batadv_priv *bat_priv)
1188 {
1189         struct batadv_hashtable *hash = bat_priv->orig_hash;
1190         struct hlist_node *node_tmp;
1191         struct hlist_head *head;
1192         spinlock_t *list_lock; /* spinlock to protect write access */
1193         struct batadv_orig_node *orig_node;
1194         u32 i;
1195
1196         if (!hash)
1197                 return;
1198
1199         /* for all origins... */
1200         for (i = 0; i < hash->size; i++) {
1201                 head = &hash->table[i];
1202                 list_lock = &hash->list_locks[i];
1203
1204                 spin_lock_bh(list_lock);
1205                 hlist_for_each_entry_safe(orig_node, node_tmp,
1206                                           head, hash_entry) {
1207                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
1208                                 batadv_gw_node_delete(bat_priv, orig_node);
1209                                 hlist_del_rcu(&orig_node->hash_entry);
1210                                 batadv_tt_global_del_orig(orig_node->bat_priv,
1211                                                           orig_node, -1,
1212                                                           "originator timed out");
1213                                 batadv_orig_node_free_ref(orig_node);
1214                                 continue;
1215                         }
1216
1217                         batadv_frag_purge_orig(orig_node,
1218                                                batadv_frag_check_entry);
1219                 }
1220                 spin_unlock_bh(list_lock);
1221         }
1222
1223         batadv_gw_election(bat_priv);
1224 }
1225
1226 static void batadv_purge_orig(struct work_struct *work)
1227 {
1228         struct delayed_work *delayed_work;
1229         struct batadv_priv *bat_priv;
1230
1231         delayed_work = container_of(work, struct delayed_work, work);
1232         bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
1233         _batadv_purge_orig(bat_priv);
1234         queue_delayed_work(batadv_event_workqueue,
1235                            &bat_priv->orig_work,
1236                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
1237 }
1238
1239 void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
1240 {
1241         _batadv_purge_orig(bat_priv);
1242 }
1243
1244 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
1245 {
1246         struct net_device *net_dev = (struct net_device *)seq->private;
1247         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1248         struct batadv_hard_iface *primary_if;
1249
1250         primary_if = batadv_seq_print_text_primary_if_get(seq);
1251         if (!primary_if)
1252                 return 0;
1253
1254         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
1255                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
1256                    primary_if->net_dev->dev_addr, net_dev->name,
1257                    bat_priv->bat_algo_ops->name);
1258
1259         batadv_hardif_free_ref(primary_if);
1260
1261         if (!bat_priv->bat_algo_ops->bat_orig_print) {
1262                 seq_puts(seq,
1263                          "No printing function for this routing protocol\n");
1264                 return 0;
1265         }
1266
1267         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq,
1268                                                BATADV_IF_DEFAULT);
1269
1270         return 0;
1271 }
1272
1273 /**
1274  * batadv_orig_hardif_seq_print_text - writes originator infos for a specific
1275  *  outgoing interface
1276  * @seq: debugfs table seq_file struct
1277  * @offset: not used
1278  *
1279  * Returns 0
1280  */
1281 int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset)
1282 {
1283         struct net_device *net_dev = (struct net_device *)seq->private;
1284         struct batadv_hard_iface *hard_iface;
1285         struct batadv_priv *bat_priv;
1286
1287         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1288
1289         if (!hard_iface || !hard_iface->soft_iface) {
1290                 seq_puts(seq, "Interface not known to B.A.T.M.A.N.\n");
1291                 goto out;
1292         }
1293
1294         bat_priv = netdev_priv(hard_iface->soft_iface);
1295         if (!bat_priv->bat_algo_ops->bat_orig_print) {
1296                 seq_puts(seq,
1297                          "No printing function for this routing protocol\n");
1298                 goto out;
1299         }
1300
1301         if (hard_iface->if_status != BATADV_IF_ACTIVE) {
1302                 seq_puts(seq, "Interface not active\n");
1303                 goto out;
1304         }
1305
1306         seq_printf(seq, "[B.A.T.M.A.N. adv %s, IF/MAC: %s/%pM (%s %s)]\n",
1307                    BATADV_SOURCE_VERSION, hard_iface->net_dev->name,
1308                    hard_iface->net_dev->dev_addr,
1309                    hard_iface->soft_iface->name, bat_priv->bat_algo_ops->name);
1310
1311         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, hard_iface);
1312
1313 out:
1314         if (hard_iface)
1315                 batadv_hardif_free_ref(hard_iface);
1316         return 0;
1317 }
1318
1319 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
1320                             int max_if_num)
1321 {
1322         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
1323         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1324         struct batadv_hashtable *hash = bat_priv->orig_hash;
1325         struct hlist_head *head;
1326         struct batadv_orig_node *orig_node;
1327         u32 i;
1328         int ret;
1329
1330         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1331          * if_num
1332          */
1333         for (i = 0; i < hash->size; i++) {
1334                 head = &hash->table[i];
1335
1336                 rcu_read_lock();
1337                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1338                         ret = 0;
1339                         if (bao->bat_orig_add_if)
1340                                 ret = bao->bat_orig_add_if(orig_node,
1341                                                            max_if_num);
1342                         if (ret == -ENOMEM)
1343                                 goto err;
1344                 }
1345                 rcu_read_unlock();
1346         }
1347
1348         return 0;
1349
1350 err:
1351         rcu_read_unlock();
1352         return -ENOMEM;
1353 }
1354
1355 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
1356                             int max_if_num)
1357 {
1358         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
1359         struct batadv_hashtable *hash = bat_priv->orig_hash;
1360         struct hlist_head *head;
1361         struct batadv_hard_iface *hard_iface_tmp;
1362         struct batadv_orig_node *orig_node;
1363         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1364         u32 i;
1365         int ret;
1366
1367         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1368          * if_num
1369          */
1370         for (i = 0; i < hash->size; i++) {
1371                 head = &hash->table[i];
1372
1373                 rcu_read_lock();
1374                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1375                         ret = 0;
1376                         if (bao->bat_orig_del_if)
1377                                 ret = bao->bat_orig_del_if(orig_node,
1378                                                            max_if_num,
1379                                                            hard_iface->if_num);
1380                         if (ret == -ENOMEM)
1381                                 goto err;
1382                 }
1383                 rcu_read_unlock();
1384         }
1385
1386         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
1387         rcu_read_lock();
1388         list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) {
1389                 if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE)
1390                         continue;
1391
1392                 if (hard_iface == hard_iface_tmp)
1393                         continue;
1394
1395                 if (hard_iface->soft_iface != hard_iface_tmp->soft_iface)
1396                         continue;
1397
1398                 if (hard_iface_tmp->if_num > hard_iface->if_num)
1399                         hard_iface_tmp->if_num--;
1400         }
1401         rcu_read_unlock();
1402
1403         hard_iface->if_num = -1;
1404         return 0;
1405
1406 err:
1407         rcu_read_unlock();
1408         return -ENOMEM;
1409 }