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/seq_file.h>
  30 #include <linux/slab.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/workqueue.h>
  33
  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 "multicast.h"
  40 #include "network-coding.h"
  41 #include "routing.h"
  42 #include "translation-table.h"
  43
  44 /* hash class keys */
  45 static struct lock_class_key batadv_orig_hash_lock_class_key;
  46
  47 static void batadv_purge_orig(struct work_struct *work);
  48
  49 /* returns 1 if they are the same originator */
  50 int batadv_compare_orig(const struct hlist_node *node, const void *data2)
  51 {
  52         const void *data1 = container_of(node, struct batadv_orig_node,
  53                                          hash_entry);
  54
  55         return batadv_compare_eth(data1, data2);
  56 }
  57
  58 /**
  59  * batadv_orig_node_vlan_get - get an orig_node_vlan object
  60  * @orig_node: the originator serving the VLAN
  61  * @vid: the VLAN identifier
  62  *
  63  * Returns the vlan object identified by vid and belonging to orig_node or NULL
  64  * if it does not exist.
  65  */
  66 struct batadv_orig_node_vlan *
  67 batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
  68                           unsigned short vid)
  69 {
  70         struct batadv_orig_node_vlan *vlan = NULL, *tmp;
  71
  72         rcu_read_lock();
  73         list_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) {
  74                 if (tmp->vid != vid)
  75                         continue;
  76
  77                 if (!atomic_inc_not_zero(&tmp->refcount))
  78                         continue;
  79
  80                 vlan = tmp;
  81
  82                 break;
  83         }
  84         rcu_read_unlock();
  85
  86         return vlan;
  87 }
  88
  89 /**
  90  * batadv_orig_node_vlan_new - search and possibly create an orig_node_vlan
  91  *  object
  92  * @orig_node: the originator serving the VLAN
  93  * @vid: the VLAN identifier
  94  *
  95  * Returns NULL in case of failure or the vlan object identified by vid and
  96  * belonging to orig_node otherwise. The object is created and added to the list
  97  * if it does not exist.
  98  *
  99  * The object is returned with refcounter increased by 1.
 100  */
 101 struct batadv_orig_node_vlan *
 102 batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
 103                           unsigned short vid)
 104 {
 105         struct batadv_orig_node_vlan *vlan;
 106
 107         spin_lock_bh(&orig_node->vlan_list_lock);
 108
 109         /* first look if an object for this vid already exists */
 110         vlan = batadv_orig_node_vlan_get(orig_node, vid);
 111         if (vlan)
 112                 goto out;
 113
 114         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 115         if (!vlan)
 116                 goto out;
 117
 118         atomic_set(&vlan->refcount, 2);
 119         vlan->vid = vid;
 120
 121         list_add_rcu(&vlan->list, &orig_node->vlan_list);
 122
 123 out:
 124         spin_unlock_bh(&orig_node->vlan_list_lock);
 125
 126         return vlan;
 127 }
 128
 129 /**
 130  * batadv_orig_node_vlan_free_ref - decrement the refcounter and possibly free
 131  *  the originator-vlan object
 132  * @orig_vlan: the originator-vlan object to release
 133  */
 134 void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan)
 135 {
 136         if (atomic_dec_and_test(&orig_vlan->refcount))
 137                 kfree_rcu(orig_vlan, rcu);
 138 }
 139
 140 int batadv_originator_init(struct batadv_priv *bat_priv)
 141 {
 142         if (bat_priv->orig_hash)
 143                 return 0;
 144
 145         bat_priv->orig_hash = batadv_hash_new(1024);
 146
 147         if (!bat_priv->orig_hash)
 148                 goto err;
 149
 150         batadv_hash_set_lock_class(bat_priv->orig_hash,
 151                                    &batadv_orig_hash_lock_class_key);
 152
 153         INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig);
 154         queue_delayed_work(batadv_event_workqueue,
 155                            &bat_priv->orig_work,
 156                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 157
 158         return 0;
 159
 160 err:
 161         return -ENOMEM;
 162 }
 163
 164 /**
 165  * batadv_neigh_ifinfo_free_rcu - free the neigh_ifinfo object
 166  * @rcu: rcu pointer of the neigh_ifinfo object
 167  */
 168 static void batadv_neigh_ifinfo_free_rcu(struct rcu_head *rcu)
 169 {
 170         struct batadv_neigh_ifinfo *neigh_ifinfo;
 171
 172         neigh_ifinfo = container_of(rcu, struct batadv_neigh_ifinfo, rcu);
 173
 174         if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 175                 batadv_hardif_free_ref_now(neigh_ifinfo->if_outgoing);
 176
 177         kfree(neigh_ifinfo);
 178 }
 179
 180 /**
 181  * batadv_neigh_ifinfo_free_now - decrement the refcounter and possibly free
 182  *  the neigh_ifinfo (without rcu callback)
 183  * @neigh_ifinfo: the neigh_ifinfo object to release
 184  */
 185 static void
 186 batadv_neigh_ifinfo_free_ref_now(struct batadv_neigh_ifinfo *neigh_ifinfo)
 187 {
 188         if (atomic_dec_and_test(&neigh_ifinfo->refcount))
 189                 batadv_neigh_ifinfo_free_rcu(&neigh_ifinfo->rcu);
 190 }
 191
 192 /**
 193  * batadv_neigh_ifinfo_free_ref - decrement the refcounter and possibly free
 194  *  the neigh_ifinfo
 195  * @neigh_ifinfo: the neigh_ifinfo object to release
 196  */
 197 void batadv_neigh_ifinfo_free_ref(struct batadv_neigh_ifinfo *neigh_ifinfo)
 198 {
 199         if (atomic_dec_and_test(&neigh_ifinfo->refcount))
 200                 call_rcu(&neigh_ifinfo->rcu, batadv_neigh_ifinfo_free_rcu);
 201 }
 202
 203 /**
 204  * batadv_neigh_node_free_rcu - free the neigh_node
 205  * @rcu: rcu pointer of the neigh_node
 206  */
 207 static void batadv_neigh_node_free_rcu(struct rcu_head *rcu)
 208 {
 209         struct hlist_node *node_tmp;
 210         struct batadv_neigh_node *neigh_node;
 211         struct batadv_neigh_ifinfo *neigh_ifinfo;
 212         struct batadv_algo_ops *bao;
 213
 214         neigh_node = container_of(rcu, struct batadv_neigh_node, rcu);
 215         bao = neigh_node->orig_node->bat_priv->bat_algo_ops;
 216
 217         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
 218                                   &neigh_node->ifinfo_list, list) {
 219                 batadv_neigh_ifinfo_free_ref_now(neigh_ifinfo);
 220         }
 221
 222         if (bao->bat_neigh_free)
 223                 bao->bat_neigh_free(neigh_node);
 224
 225         batadv_hardif_free_ref_now(neigh_node->if_incoming);
 226
 227         kfree(neigh_node);
 228 }
 229
 230 /**
 231  * batadv_neigh_node_free_ref_now - decrement the neighbors refcounter
 232  *  and possibly free it (without rcu callback)
 233  * @neigh_node: neigh neighbor to free
 234  */
 235 static void
 236 batadv_neigh_node_free_ref_now(struct batadv_neigh_node *neigh_node)
 237 {
 238         if (atomic_dec_and_test(&neigh_node->refcount))
 239                 batadv_neigh_node_free_rcu(&neigh_node->rcu);
 240 }
 241
 242 /**
 243  * batadv_neigh_node_free_ref - decrement the neighbors refcounter
 244  *  and possibly free it
 245  * @neigh_node: neigh neighbor to free
 246  */
 247 void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node)
 248 {
 249         if (atomic_dec_and_test(&neigh_node->refcount))
 250                 call_rcu(&neigh_node->rcu, batadv_neigh_node_free_rcu);
 251 }
 252
 253 /**
 254  * batadv_orig_node_get_router - router to the originator depending on iface
 255  * @orig_node: the orig node for the router
 256  * @if_outgoing: the interface where the payload packet has been received or
 257  *  the OGM should be sent to
 258  *
 259  * Returns the neighbor which should be router for this orig_node/iface.
 260  *
 261  * The object is returned with refcounter increased by 1.
 262  */
 263 struct batadv_neigh_node *
 264 batadv_orig_router_get(struct batadv_orig_node *orig_node,
 265                        const struct batadv_hard_iface *if_outgoing)
 266 {
 267         struct batadv_orig_ifinfo *orig_ifinfo;
 268         struct batadv_neigh_node *router = NULL;
 269
 270         rcu_read_lock();
 271         hlist_for_each_entry_rcu(orig_ifinfo, &orig_node->ifinfo_list, list) {
 272                 if (orig_ifinfo->if_outgoing != if_outgoing)
 273                         continue;
 274
 275                 router = rcu_dereference(orig_ifinfo->router);
 276                 break;
 277         }
 278
 279         if (router && !atomic_inc_not_zero(&router->refcount))
 280                 router = NULL;
 281
 282         rcu_read_unlock();
 283         return router;
 284 }
 285
 286 /**
 287  * batadv_orig_ifinfo_get - find the ifinfo from an orig_node
 288  * @orig_node: the orig node to be queried
 289  * @if_outgoing: the interface for which the ifinfo should be acquired
 290  *
 291  * Returns the requested orig_ifinfo or NULL if not found.
 292  *
 293  * The object is returned with refcounter increased by 1.
 294  */
 295 struct batadv_orig_ifinfo *
 296 batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node,
 297                        struct batadv_hard_iface *if_outgoing)
 298 {
 299         struct batadv_orig_ifinfo *tmp, *orig_ifinfo = NULL;
 300
 301         rcu_read_lock();
 302         hlist_for_each_entry_rcu(tmp, &orig_node->ifinfo_list,
 303                                  list) {
 304                 if (tmp->if_outgoing != if_outgoing)
 305                         continue;
 306
 307                 if (!atomic_inc_not_zero(&tmp->refcount))
 308                         continue;
 309
 310                 orig_ifinfo = tmp;
 311                 break;
 312         }
 313         rcu_read_unlock();
 314
 315         return orig_ifinfo;
 316 }
 317
 318 /**
 319  * batadv_orig_ifinfo_new - search and possibly create an orig_ifinfo object
 320  * @orig_node: the orig node to be queried
 321  * @if_outgoing: the interface for which the ifinfo should be acquired
 322  *
 323  * Returns NULL in case of failure or the orig_ifinfo object for the if_outgoing
 324  * interface otherwise. The object is created and added to the list
 325  * if it does not exist.
 326  *
 327  * The object is returned with refcounter increased by 1.
 328  */
 329 struct batadv_orig_ifinfo *
 330 batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node,
 331                        struct batadv_hard_iface *if_outgoing)
 332 {
 333         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
 334         unsigned long reset_time;
 335
 336         spin_lock_bh(&orig_node->neigh_list_lock);
 337
 338         orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing);
 339         if (orig_ifinfo)
 340                 goto out;
 341
 342         orig_ifinfo = kzalloc(sizeof(*orig_ifinfo), GFP_ATOMIC);
 343         if (!orig_ifinfo)
 344                 goto out;
 345
 346         if (if_outgoing != BATADV_IF_DEFAULT &&
 347             !atomic_inc_not_zero(&if_outgoing->refcount)) {
 348                 kfree(orig_ifinfo);
 349                 orig_ifinfo = NULL;
 350                 goto out;
 351         }
 352
 353         reset_time = jiffies - 1;
 354         reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 355         orig_ifinfo->batman_seqno_reset = reset_time;
 356         orig_ifinfo->if_outgoing = if_outgoing;
 357         INIT_HLIST_NODE(&orig_ifinfo->list);
 358         atomic_set(&orig_ifinfo->refcount, 2);
 359         hlist_add_head_rcu(&orig_ifinfo->list,
 360                            &orig_node->ifinfo_list);
 361 out:
 362         spin_unlock_bh(&orig_node->neigh_list_lock);
 363         return orig_ifinfo;
 364 }
 365
 366 /**
 367  * batadv_neigh_ifinfo_get - find the ifinfo from an neigh_node
 368  * @neigh_node: the neigh node to be queried
 369  * @if_outgoing: the interface for which the ifinfo should be acquired
 370  *
 371  * The object is returned with refcounter increased by 1.
 372  *
 373  * Returns the requested neigh_ifinfo or NULL if not found
 374  */
 375 struct batadv_neigh_ifinfo *
 376 batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh,
 377                         struct batadv_hard_iface *if_outgoing)
 378 {
 379         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL,
 380                                    *tmp_neigh_ifinfo;
 381
 382         rcu_read_lock();
 383         hlist_for_each_entry_rcu(tmp_neigh_ifinfo, &neigh->ifinfo_list,
 384                                  list) {
 385                 if (tmp_neigh_ifinfo->if_outgoing != if_outgoing)
 386                         continue;
 387
 388                 if (!atomic_inc_not_zero(&tmp_neigh_ifinfo->refcount))
 389                         continue;
 390
 391                 neigh_ifinfo = tmp_neigh_ifinfo;
 392                 break;
 393         }
 394         rcu_read_unlock();
 395
 396         return neigh_ifinfo;
 397 }
 398
 399 /**
 400  * batadv_neigh_ifinfo_new - search and possibly create an neigh_ifinfo object
 401  * @neigh_node: the neigh node to be queried
 402  * @if_outgoing: the interface for which the ifinfo should be acquired
 403  *
 404  * Returns NULL in case of failure or the neigh_ifinfo object for the
 405  * if_outgoing interface otherwise. The object is created and added to the list
 406  * if it does not exist.
 407  *
 408  * The object is returned with refcounter increased by 1.
 409  */
 410 struct batadv_neigh_ifinfo *
 411 batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh,
 412                         struct batadv_hard_iface *if_outgoing)
 413 {
 414         struct batadv_neigh_ifinfo *neigh_ifinfo;
 415
 416         spin_lock_bh(&neigh->ifinfo_lock);
 417
 418         neigh_ifinfo = batadv_neigh_ifinfo_get(neigh, if_outgoing);
 419         if (neigh_ifinfo)
 420                 goto out;
 421
 422         neigh_ifinfo = kzalloc(sizeof(*neigh_ifinfo), GFP_ATOMIC);
 423         if (!neigh_ifinfo)
 424                 goto out;
 425
 426         if (if_outgoing && !atomic_inc_not_zero(&if_outgoing->refcount)) {
 427                 kfree(neigh_ifinfo);
 428                 neigh_ifinfo = NULL;
 429                 goto out;
 430         }
 431
 432         INIT_HLIST_NODE(&neigh_ifinfo->list);
 433         atomic_set(&neigh_ifinfo->refcount, 2);
 434         neigh_ifinfo->if_outgoing = if_outgoing;
 435
 436         hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list);
 437
 438 out:
 439         spin_unlock_bh(&neigh->ifinfo_lock);
 440
 441         return neigh_ifinfo;
 442 }
 443
 444 /**
 445  * batadv_neigh_node_new - create and init a new neigh_node object
 446  * @hard_iface: the interface where the neighbour is connected to
 447  * @neigh_addr: the mac address of the neighbour interface
 448  * @orig_node: originator object representing the neighbour
 449  *
 450  * Allocates a new neigh_node object and initialises all the generic fields.
 451  * Returns the new object or NULL on failure.
 452  */
 453 struct batadv_neigh_node *
 454 batadv_neigh_node_new(struct batadv_hard_iface *hard_iface,
 455                       const uint8_t *neigh_addr,
 456                       struct batadv_orig_node *orig_node)
 457 {
 458         struct batadv_neigh_node *neigh_node;
 459
 460         neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
 461         if (!neigh_node)
 462                 goto out;
 463
 464         INIT_HLIST_NODE(&neigh_node->list);
 465         INIT_HLIST_HEAD(&neigh_node->ifinfo_list);
 466         spin_lock_init(&neigh_node->ifinfo_lock);
 467
 468         ether_addr_copy(neigh_node->addr, neigh_addr);
 469         neigh_node->if_incoming = hard_iface;
 470         neigh_node->orig_node = orig_node;
 471
 472         /* extra reference for return */
 473         atomic_set(&neigh_node->refcount, 2);
 474
 475 out:
 476         return neigh_node;
 477 }
 478
 479 /**
 480  * batadv_neigh_node_get - retrieve a neighbour from the list
 481  * @orig_node: originator which the neighbour belongs to
 482  * @hard_iface: the interface where this neighbour is connected to
 483  * @addr: the address of the neighbour
 484  *
 485  * Looks for and possibly returns a neighbour belonging to this originator list
 486  * which is connected through the provided hard interface.
 487  * Returns NULL if the neighbour is not found.
 488  */
 489 struct batadv_neigh_node *
 490 batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
 491                       const struct batadv_hard_iface *hard_iface,
 492                       const uint8_t *addr)
 493 {
 494         struct batadv_neigh_node *tmp_neigh_node, *res = NULL;
 495
 496         rcu_read_lock();
 497         hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) {
 498                 if (!batadv_compare_eth(tmp_neigh_node->addr, addr))
 499                         continue;
 500
 501                 if (tmp_neigh_node->if_incoming != hard_iface)
 502                         continue;
 503
 504                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 505                         continue;
 506
 507                 res = tmp_neigh_node;
 508                 break;
 509         }
 510         rcu_read_unlock();
 511
 512         return res;
 513 }
 514
 515 /**
 516  * batadv_orig_ifinfo_free_rcu - free the orig_ifinfo object
 517  * @rcu: rcu pointer of the orig_ifinfo object
 518  */
 519 static void batadv_orig_ifinfo_free_rcu(struct rcu_head *rcu)
 520 {
 521         struct batadv_orig_ifinfo *orig_ifinfo;
 522         struct batadv_neigh_node *router;
 523
 524         orig_ifinfo = container_of(rcu, struct batadv_orig_ifinfo, rcu);
 525
 526         if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 527                 batadv_hardif_free_ref_now(orig_ifinfo->if_outgoing);
 528
 529         /* this is the last reference to this object */
 530         router = rcu_dereference_protected(orig_ifinfo->router, true);
 531         if (router)
 532                 batadv_neigh_node_free_ref_now(router);
 533         kfree(orig_ifinfo);
 534 }
 535
 536 /**
 537  * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly free
 538  *  the orig_ifinfo (without rcu callback)
 539  * @orig_ifinfo: the orig_ifinfo object to release
 540  */
 541 static void
 542 batadv_orig_ifinfo_free_ref_now(struct batadv_orig_ifinfo *orig_ifinfo)
 543 {
 544         if (atomic_dec_and_test(&orig_ifinfo->refcount))
 545                 batadv_orig_ifinfo_free_rcu(&orig_ifinfo->rcu);
 546 }
 547
 548 /**
 549  * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly free
 550  *  the orig_ifinfo
 551  * @orig_ifinfo: the orig_ifinfo object to release
 552  */
 553 void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo)
 554 {
 555         if (atomic_dec_and_test(&orig_ifinfo->refcount))
 556                 call_rcu(&orig_ifinfo->rcu, batadv_orig_ifinfo_free_rcu);
 557 }
 558
 559 static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 560 {
 561         struct hlist_node *node_tmp;
 562         struct batadv_neigh_node *neigh_node;
 563         struct batadv_orig_node *orig_node;
 564         struct batadv_orig_ifinfo *orig_ifinfo;
 565
 566         orig_node = container_of(rcu, struct batadv_orig_node, rcu);
 567
 568         spin_lock_bh(&orig_node->neigh_list_lock);
 569
 570         /* for all neighbors towards this originator ... */
 571         hlist_for_each_entry_safe(neigh_node, node_tmp,
 572                                   &orig_node->neigh_list, list) {
 573                 hlist_del_rcu(&neigh_node->list);
 574                 batadv_neigh_node_free_ref_now(neigh_node);
 575         }
 576
 577         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 578                                   &orig_node->ifinfo_list, list) {
 579                 hlist_del_rcu(&orig_ifinfo->list);
 580                 batadv_orig_ifinfo_free_ref_now(orig_ifinfo);
 581         }
 582         spin_unlock_bh(&orig_node->neigh_list_lock);
 583
 584         batadv_mcast_purge_orig(orig_node);
 585
 586         /* Free nc_nodes */
 587         batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 588
 589         batadv_frag_purge_orig(orig_node, NULL);
 590
 591         if (orig_node->bat_priv->bat_algo_ops->bat_orig_free)
 592                 orig_node->bat_priv->bat_algo_ops->bat_orig_free(orig_node);
 593
 594         kfree(orig_node->tt_buff);
 595         kfree(orig_node);
 596 }
 597
 598 /**
 599  * batadv_orig_node_free_ref - decrement the orig node refcounter and possibly
 600  * schedule an rcu callback for freeing it
 601  * @orig_node: the orig node to free
 602  */
 603 void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
 604 {
 605         if (atomic_dec_and_test(&orig_node->refcount))
 606                 call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
 607 }
 608
 609 /**
 610  * batadv_orig_node_free_ref_now - decrement the orig node refcounter and
 611  * possibly free it (without rcu callback)
 612  * @orig_node: the orig node to free
 613  */
 614 void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node)
 615 {
 616         if (atomic_dec_and_test(&orig_node->refcount))
 617                 batadv_orig_node_free_rcu(&orig_node->rcu);
 618 }
 619
 620 void batadv_originator_free(struct batadv_priv *bat_priv)
 621 {
 622         struct batadv_hashtable *hash = bat_priv->orig_hash;
 623         struct hlist_node *node_tmp;
 624         struct hlist_head *head;
 625         spinlock_t *list_lock; /* spinlock to protect write access */
 626         struct batadv_orig_node *orig_node;
 627         uint32_t i;
 628
 629         if (!hash)
 630                 return;
 631
 632         cancel_delayed_work_sync(&bat_priv->orig_work);
 633
 634         bat_priv->orig_hash = NULL;
 635
 636         for (i = 0; i < hash->size; i++) {
 637                 head = &hash->table[i];
 638                 list_lock = &hash->list_locks[i];
 639
 640                 spin_lock_bh(list_lock);
 641                 hlist_for_each_entry_safe(orig_node, node_tmp,
 642                                           head, hash_entry) {
 643                         hlist_del_rcu(&orig_node->hash_entry);
 644                         batadv_orig_node_free_ref(orig_node);
 645                 }
 646                 spin_unlock_bh(list_lock);
 647         }
 648
 649         batadv_hash_destroy(hash);
 650 }
 651
 652 /**
 653  * batadv_orig_node_new - creates a new orig_node
 654  * @bat_priv: the bat priv with all the soft interface information
 655  * @addr: the mac address of the originator
 656  *
 657  * Creates a new originator object and initialise all the generic fields.
 658  * The new object is not added to the originator list.
 659  * Returns the newly created object or NULL on failure.
 660  */
 661 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
 662                                               const uint8_t *addr)
 663 {
 664         struct batadv_orig_node *orig_node;
 665         struct batadv_orig_node_vlan *vlan;
 666         unsigned long reset_time;
 667         int i;
 668
 669         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 670                    "Creating new originator: %pM\n", addr);
 671
 672         orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
 673         if (!orig_node)
 674                 return NULL;
 675
 676         INIT_HLIST_HEAD(&orig_node->neigh_list);
 677         INIT_LIST_HEAD(&orig_node->vlan_list);
 678         INIT_HLIST_HEAD(&orig_node->ifinfo_list);
 679         spin_lock_init(&orig_node->bcast_seqno_lock);
 680         spin_lock_init(&orig_node->neigh_list_lock);
 681         spin_lock_init(&orig_node->tt_buff_lock);
 682         spin_lock_init(&orig_node->tt_lock);
 683         spin_lock_init(&orig_node->vlan_list_lock);
 684
 685         batadv_nc_init_orig(orig_node);
 686
 687         /* extra reference for return */
 688         atomic_set(&orig_node->refcount, 2);
 689
 690         orig_node->bat_priv = bat_priv;
 691         ether_addr_copy(orig_node->orig, addr);
 692         batadv_dat_init_orig_node_addr(orig_node);
 693         atomic_set(&orig_node->last_ttvn, 0);
 694         orig_node->tt_buff = NULL;
 695         orig_node->tt_buff_len = 0;
 696         orig_node->last_seen = jiffies;
 697         reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 698         orig_node->bcast_seqno_reset = reset_time;
 699
 700 #ifdef CONFIG_BATMAN_ADV_MCAST
 701         orig_node->mcast_flags = BATADV_NO_FLAGS;
 702         INIT_HLIST_NODE(&orig_node->mcast_want_all_unsnoopables_node);
 703         INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv4_node);
 704         INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv6_node);
 705         spin_lock_init(&orig_node->mcast_handler_lock);
 706 #endif
 707
 708         /* create a vlan object for the "untagged" LAN */
 709         vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);
 710         if (!vlan)
 711                 goto free_orig_node;
 712         /* batadv_orig_node_vlan_new() increases the refcounter.
 713          * Immediately release vlan since it is not needed anymore in this
 714          * context
 715          */
 716         batadv_orig_node_vlan_free_ref(vlan);
 717
 718         for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
 719                 INIT_HLIST_HEAD(&orig_node->fragments[i].head);
 720                 spin_lock_init(&orig_node->fragments[i].lock);
 721                 orig_node->fragments[i].size = 0;
 722         }
 723
 724         return orig_node;
 725 free_orig_node:
 726         kfree(orig_node);
 727         return NULL;
 728 }
 729
 730 /**
 731  * batadv_purge_neigh_ifinfo - purge obsolete ifinfo entries from neighbor
 732  * @bat_priv: the bat priv with all the soft interface information
 733  * @neigh: orig node which is to be checked
 734  */
 735 static void
 736 batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv,
 737                           struct batadv_neigh_node *neigh)
 738 {
 739         struct batadv_neigh_ifinfo *neigh_ifinfo;
 740         struct batadv_hard_iface *if_outgoing;
 741         struct hlist_node *node_tmp;
 742
 743         spin_lock_bh(&neigh->ifinfo_lock);
 744
 745         /* for all ifinfo objects for this neighinator */
 746         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
 747                                   &neigh->ifinfo_list, list) {
 748                 if_outgoing = neigh_ifinfo->if_outgoing;
 749
 750                 /* always keep the default interface */
 751                 if (if_outgoing == BATADV_IF_DEFAULT)
 752                         continue;
 753
 754                 /* don't purge if the interface is not (going) down */
 755                 if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
 756                     (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
 757                     (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
 758                         continue;
 759
 760                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 761                            "neighbor/ifinfo purge: neighbor %pM, iface: %s\n",
 762                            neigh->addr, if_outgoing->net_dev->name);
 763
 764                 hlist_del_rcu(&neigh_ifinfo->list);
 765                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
 766         }
 767
 768         spin_unlock_bh(&neigh->ifinfo_lock);
 769 }
 770
 771 /**
 772  * batadv_purge_orig_ifinfo - purge obsolete ifinfo entries from originator
 773  * @bat_priv: the bat priv with all the soft interface information
 774  * @orig_node: orig node which is to be checked
 775  *
 776  * Returns true if any ifinfo entry was purged, false otherwise.
 777  */
 778 static bool
 779 batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv,
 780                          struct batadv_orig_node *orig_node)
 781 {
 782         struct batadv_orig_ifinfo *orig_ifinfo;
 783         struct batadv_hard_iface *if_outgoing;
 784         struct hlist_node *node_tmp;
 785         bool ifinfo_purged = false;
 786
 787         spin_lock_bh(&orig_node->neigh_list_lock);
 788
 789         /* for all ifinfo objects for this originator */
 790         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 791                                   &orig_node->ifinfo_list, list) {
 792                 if_outgoing = orig_ifinfo->if_outgoing;
 793
 794                 /* always keep the default interface */
 795                 if (if_outgoing == BATADV_IF_DEFAULT)
 796                         continue;
 797
 798                 /* don't purge if the interface is not (going) down */
 799                 if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
 800                     (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
 801                     (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
 802                         continue;
 803
 804                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 805                            "router/ifinfo purge: originator %pM, iface: %s\n",
 806                            orig_node->orig, if_outgoing->net_dev->name);
 807
 808                 ifinfo_purged = true;
 809
 810                 hlist_del_rcu(&orig_ifinfo->list);
 811                 batadv_orig_ifinfo_free_ref(orig_ifinfo);
 812                 if (orig_node->last_bonding_candidate == orig_ifinfo) {
 813                         orig_node->last_bonding_candidate = NULL;
 814                         batadv_orig_ifinfo_free_ref(orig_ifinfo);
 815                 }
 816         }
 817
 818         spin_unlock_bh(&orig_node->neigh_list_lock);
 819
 820         return ifinfo_purged;
 821 }
 822
 823 /**
 824  * batadv_purge_orig_neighbors - purges neighbors from originator
 825  * @bat_priv: the bat priv with all the soft interface information
 826  * @orig_node: orig node which is to be checked
 827  *
 828  * Returns true if any neighbor was purged, false otherwise
 829  */
 830 static bool
 831 batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
 832                             struct batadv_orig_node *orig_node)
 833 {
 834         struct hlist_node *node_tmp;
 835         struct batadv_neigh_node *neigh_node;
 836         bool neigh_purged = false;
 837         unsigned long last_seen;
 838         struct batadv_hard_iface *if_incoming;
 839
 840         spin_lock_bh(&orig_node->neigh_list_lock);
 841
 842         /* for all neighbors towards this originator ... */
 843         hlist_for_each_entry_safe(neigh_node, node_tmp,
 844                                   &orig_node->neigh_list, list) {
 845                 last_seen = neigh_node->last_seen;
 846                 if_incoming = neigh_node->if_incoming;
 847
 848                 if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) ||
 849                     (if_incoming->if_status == BATADV_IF_INACTIVE) ||
 850                     (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 851                     (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) {
 852                         if ((if_incoming->if_status == BATADV_IF_INACTIVE) ||
 853                             (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 854                             (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED))
 855                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 856                                            "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
 857                                            orig_node->orig, neigh_node->addr,
 858                                            if_incoming->net_dev->name);
 859                         else
 860                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 861                                            "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
 862                                            orig_node->orig, neigh_node->addr,
 863                                            jiffies_to_msecs(last_seen));
 864
 865                         neigh_purged = true;
 866
 867                         hlist_del_rcu(&neigh_node->list);
 868                         batadv_neigh_node_free_ref(neigh_node);
 869                 } else {
 870                         /* only necessary if not the whole neighbor is to be
 871                          * deleted, but some interface has been removed.
 872                          */
 873                         batadv_purge_neigh_ifinfo(bat_priv, neigh_node);
 874                 }
 875         }
 876
 877         spin_unlock_bh(&orig_node->neigh_list_lock);
 878         return neigh_purged;
 879 }
 880
 881 /**
 882  * batadv_find_best_neighbor - finds the best neighbor after purging
 883  * @bat_priv: the bat priv with all the soft interface information
 884  * @orig_node: orig node which is to be checked
 885  * @if_outgoing: the interface for which the metric should be compared
 886  *
 887  * Returns the current best neighbor, with refcount increased.
 888  */
 889 static struct batadv_neigh_node *
 890 batadv_find_best_neighbor(struct batadv_priv *bat_priv,
 891                           struct batadv_orig_node *orig_node,
 892                           struct batadv_hard_iface *if_outgoing)
 893 {
 894         struct batadv_neigh_node *best = NULL, *neigh;
 895         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
 896
 897         rcu_read_lock();
 898         hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) {
 899                 if (best && (bao->bat_neigh_cmp(neigh, if_outgoing,
 900                                                 best, if_outgoing) <= 0))
 901                         continue;
 902
 903                 if (!atomic_inc_not_zero(&neigh->refcount))
 904                         continue;
 905
 906                 if (best)
 907                         batadv_neigh_node_free_ref(best);
 908
 909                 best = neigh;
 910         }
 911         rcu_read_unlock();
 912
 913         return best;
 914 }
 915
 916 /**
 917  * batadv_purge_orig_node - purges obsolete information from an orig_node
 918  * @bat_priv: the bat priv with all the soft interface information
 919  * @orig_node: orig node which is to be checked
 920  *
 921  * This function checks if the orig_node or substructures of it have become
 922  * obsolete, and purges this information if that's the case.
 923  *
 924  * Returns true if the orig_node is to be removed, false otherwise.
 925  */
 926 static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
 927                                    struct batadv_orig_node *orig_node)
 928 {
 929         struct batadv_neigh_node *best_neigh_node;
 930         struct batadv_hard_iface *hard_iface;
 931         bool changed_ifinfo, changed_neigh;
 932
 933         if (batadv_has_timed_out(orig_node->last_seen,
 934                                  2 * BATADV_PURGE_TIMEOUT)) {
 935                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 936                            "Originator timeout: originator %pM, last_seen %u\n",
 937                            orig_node->orig,
 938                            jiffies_to_msecs(orig_node->last_seen));
 939                 return true;
 940         }
 941         changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node);
 942         changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node);
 943
 944         if (!changed_ifinfo && !changed_neigh)
 945                 return false;
 946
 947         /* first for NULL ... */
 948         best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node,
 949                                                     BATADV_IF_DEFAULT);
 950         batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT,
 951                             best_neigh_node);
 952         if (best_neigh_node)
 953                 batadv_neigh_node_free_ref(best_neigh_node);
 954
 955         /* ... then for all other interfaces. */
 956         rcu_read_lock();
 957         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 958                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
 959                         continue;
 960
 961                 if (hard_iface->soft_iface != bat_priv->soft_iface)
 962                         continue;
 963
 964                 best_neigh_node = batadv_find_best_neighbor(bat_priv,
 965                                                             orig_node,
 966                                                             hard_iface);
 967                 batadv_update_route(bat_priv, orig_node, hard_iface,
 968                                     best_neigh_node);
 969                 if (best_neigh_node)
 970                         batadv_neigh_node_free_ref(best_neigh_node);
 971         }
 972         rcu_read_unlock();
 973
 974         return false;
 975 }
 976
 977 static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 978 {
 979         struct batadv_hashtable *hash = bat_priv->orig_hash;
 980         struct hlist_node *node_tmp;
 981         struct hlist_head *head;
 982         spinlock_t *list_lock; /* spinlock to protect write access */
 983         struct batadv_orig_node *orig_node;
 984         uint32_t i;
 985
 986         if (!hash)
 987                 return;
 988
 989         /* for all origins... */
 990         for (i = 0; i < hash->size; i++) {
 991                 head = &hash->table[i];
 992                 list_lock = &hash->list_locks[i];
 993
 994                 spin_lock_bh(list_lock);
 995                 hlist_for_each_entry_safe(orig_node, node_tmp,
 996                                           head, hash_entry) {
 997                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
 998                                 batadv_gw_node_delete(bat_priv, orig_node);
 999                                 hlist_del_rcu(&orig_node->hash_entry);
1000                                 batadv_tt_global_del_orig(orig_node->bat_priv,
1001                                                           orig_node, -1,
1002                                                           "originator timed out");
1003                                 batadv_orig_node_free_ref(orig_node);
1004                                 continue;
1005                         }
1006
1007                         batadv_frag_purge_orig(orig_node,
1008                                                batadv_frag_check_entry);
1009                 }
1010                 spin_unlock_bh(list_lock);
1011         }
1012
1013         batadv_gw_node_purge(bat_priv);
1014         batadv_gw_election(bat_priv);
1015 }
1016
1017 static void batadv_purge_orig(struct work_struct *work)
1018 {
1019         struct delayed_work *delayed_work;
1020         struct batadv_priv *bat_priv;
1021
1022         delayed_work = container_of(work, struct delayed_work, work);
1023         bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
1024         _batadv_purge_orig(bat_priv);
1025         queue_delayed_work(batadv_event_workqueue,
1026                            &bat_priv->orig_work,
1027                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
1028 }
1029
1030 void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
1031 {
1032         _batadv_purge_orig(bat_priv);
1033 }
1034
1035 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
1036 {
1037         struct net_device *net_dev = (struct net_device *)seq->private;
1038         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1039         struct batadv_hard_iface *primary_if;
1040
1041         primary_if = batadv_seq_print_text_primary_if_get(seq);
1042         if (!primary_if)
1043                 return 0;
1044
1045         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
1046                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
1047                    primary_if->net_dev->dev_addr, net_dev->name,
1048                    bat_priv->bat_algo_ops->name);
1049
1050         batadv_hardif_free_ref(primary_if);
1051
1052         if (!bat_priv->bat_algo_ops->bat_orig_print) {
1053                 seq_puts(seq,
1054                          "No printing function for this routing protocol\n");
1055                 return 0;
1056         }
1057
1058         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq,
1059                                                BATADV_IF_DEFAULT);
1060
1061         return 0;
1062 }
1063
1064 /**
1065  * batadv_orig_hardif_seq_print_text - writes originator infos for a specific
1066  *  outgoing interface
1067  * @seq: debugfs table seq_file struct
1068  * @offset: not used
1069  *
1070  * Returns 0
1071  */
1072 int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset)
1073 {
1074         struct net_device *net_dev = (struct net_device *)seq->private;
1075         struct batadv_hard_iface *hard_iface;
1076         struct batadv_priv *bat_priv;
1077
1078         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1079
1080         if (!hard_iface || !hard_iface->soft_iface) {
1081                 seq_puts(seq, "Interface not known to B.A.T.M.A.N.\n");
1082                 goto out;
1083         }
1084
1085         bat_priv = netdev_priv(hard_iface->soft_iface);
1086         if (!bat_priv->bat_algo_ops->bat_orig_print) {
1087                 seq_puts(seq,
1088                          "No printing function for this routing protocol\n");
1089                 goto out;
1090         }
1091
1092         if (hard_iface->if_status != BATADV_IF_ACTIVE) {
1093                 seq_puts(seq, "Interface not active\n");
1094                 goto out;
1095         }
1096
1097         seq_printf(seq, "[B.A.T.M.A.N. adv %s, IF/MAC: %s/%pM (%s %s)]\n",
1098                    BATADV_SOURCE_VERSION, hard_iface->net_dev->name,
1099                    hard_iface->net_dev->dev_addr,
1100                    hard_iface->soft_iface->name, bat_priv->bat_algo_ops->name);
1101
1102         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, hard_iface);
1103
1104 out:
1105         if (hard_iface)
1106                 batadv_hardif_free_ref(hard_iface);
1107         return 0;
1108 }
1109
1110 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
1111                             int max_if_num)
1112 {
1113         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
1114         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1115         struct batadv_hashtable *hash = bat_priv->orig_hash;
1116         struct hlist_head *head;
1117         struct batadv_orig_node *orig_node;
1118         uint32_t i;
1119         int ret;
1120
1121         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1122          * if_num
1123          */
1124         for (i = 0; i < hash->size; i++) {
1125                 head = &hash->table[i];
1126
1127                 rcu_read_lock();
1128                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1129                         ret = 0;
1130                         if (bao->bat_orig_add_if)
1131                                 ret = bao->bat_orig_add_if(orig_node,
1132                                                            max_if_num);
1133                         if (ret == -ENOMEM)
1134                                 goto err;
1135                 }
1136                 rcu_read_unlock();
1137         }
1138
1139         return 0;
1140
1141 err:
1142         rcu_read_unlock();
1143         return -ENOMEM;
1144 }
1145
1146 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
1147                             int max_if_num)
1148 {
1149         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
1150         struct batadv_hashtable *hash = bat_priv->orig_hash;
1151         struct hlist_head *head;
1152         struct batadv_hard_iface *hard_iface_tmp;
1153         struct batadv_orig_node *orig_node;
1154         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1155         uint32_t i;
1156         int ret;
1157
1158         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1159          * if_num
1160          */
1161         for (i = 0; i < hash->size; i++) {
1162                 head = &hash->table[i];
1163
1164                 rcu_read_lock();
1165                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1166                         ret = 0;
1167                         if (bao->bat_orig_del_if)
1168                                 ret = bao->bat_orig_del_if(orig_node,
1169                                                            max_if_num,
1170                                                            hard_iface->if_num);
1171                         if (ret == -ENOMEM)
1172                                 goto err;
1173                 }
1174                 rcu_read_unlock();
1175         }
1176
1177         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
1178         rcu_read_lock();
1179         list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) {
1180                 if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE)
1181                         continue;
1182
1183                 if (hard_iface == hard_iface_tmp)
1184                         continue;
1185
1186                 if (hard_iface->soft_iface != hard_iface_tmp->soft_iface)
1187                         continue;
1188
1189                 if (hard_iface_tmp->if_num > hard_iface->if_num)
1190                         hard_iface_tmp->if_num--;
1191         }
1192         rcu_read_unlock();
1193
1194         hard_iface->if_num = -1;
1195         return 0;
1196
1197 err:
1198         rcu_read_unlock();
1199         return -ENOMEM;
1200 }