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_neigh_node_free_rcu - free the neigh_node
 206  * @rcu: rcu pointer of the neigh_node
 207  */
 208 static void batadv_neigh_node_free_rcu(struct rcu_head *rcu)
 209 {
 210         struct hlist_node *node_tmp;
 211         struct batadv_neigh_node *neigh_node;
 212         struct batadv_neigh_ifinfo *neigh_ifinfo;
 213         struct batadv_algo_ops *bao;
 214
 215         neigh_node = container_of(rcu, struct batadv_neigh_node, rcu);
 216         bao = neigh_node->orig_node->bat_priv->bat_algo_ops;
 217
 218         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
 219                                   &neigh_node->ifinfo_list, list) {
 220                 batadv_neigh_ifinfo_free_ref_now(neigh_ifinfo);
 221         }
 222
 223         if (bao->bat_neigh_free)
 224                 bao->bat_neigh_free(neigh_node);
 225
 226         batadv_hardif_free_ref_now(neigh_node->if_incoming);
 227
 228         kfree(neigh_node);
 229 }
 230
 231 /**
 232  * batadv_neigh_node_free_ref - decrement the neighbors refcounter
 233  *  and possibly release it
 234  * @neigh_node: neigh neighbor to free
 235  */
 236 void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node)
 237 {
 238         if (atomic_dec_and_test(&neigh_node->refcount))
 239                 call_rcu(&neigh_node->rcu, batadv_neigh_node_free_rcu);
 240 }
 241
 242 /**
 243  * batadv_orig_node_get_router - router to the originator depending on iface
 244  * @orig_node: the orig node for the router
 245  * @if_outgoing: the interface where the payload packet has been received or
 246  *  the OGM should be sent to
 247  *
 248  * Returns the neighbor which should be router for this orig_node/iface.
 249  *
 250  * The object is returned with refcounter increased by 1.
 251  */
 252 struct batadv_neigh_node *
 253 batadv_orig_router_get(struct batadv_orig_node *orig_node,
 254                        const struct batadv_hard_iface *if_outgoing)
 255 {
 256         struct batadv_orig_ifinfo *orig_ifinfo;
 257         struct batadv_neigh_node *router = NULL;
 258
 259         rcu_read_lock();
 260         hlist_for_each_entry_rcu(orig_ifinfo, &orig_node->ifinfo_list, list) {
 261                 if (orig_ifinfo->if_outgoing != if_outgoing)
 262                         continue;
 263
 264                 router = rcu_dereference(orig_ifinfo->router);
 265                 break;
 266         }
 267
 268         if (router && !atomic_inc_not_zero(&router->refcount))
 269                 router = NULL;
 270
 271         rcu_read_unlock();
 272         return router;
 273 }
 274
 275 /**
 276  * batadv_orig_ifinfo_get - find the ifinfo from an orig_node
 277  * @orig_node: the orig node to be queried
 278  * @if_outgoing: the interface for which the ifinfo should be acquired
 279  *
 280  * Returns the requested orig_ifinfo or NULL if not found.
 281  *
 282  * The object is returned with refcounter increased by 1.
 283  */
 284 struct batadv_orig_ifinfo *
 285 batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node,
 286                        struct batadv_hard_iface *if_outgoing)
 287 {
 288         struct batadv_orig_ifinfo *tmp, *orig_ifinfo = NULL;
 289
 290         rcu_read_lock();
 291         hlist_for_each_entry_rcu(tmp, &orig_node->ifinfo_list,
 292                                  list) {
 293                 if (tmp->if_outgoing != if_outgoing)
 294                         continue;
 295
 296                 if (!atomic_inc_not_zero(&tmp->refcount))
 297                         continue;
 298
 299                 orig_ifinfo = tmp;
 300                 break;
 301         }
 302         rcu_read_unlock();
 303
 304         return orig_ifinfo;
 305 }
 306
 307 /**
 308  * batadv_orig_ifinfo_new - search and possibly create an orig_ifinfo object
 309  * @orig_node: the orig node to be queried
 310  * @if_outgoing: the interface for which the ifinfo should be acquired
 311  *
 312  * Returns NULL in case of failure or the orig_ifinfo object for the if_outgoing
 313  * interface otherwise. The object is created and added to the list
 314  * if it does not exist.
 315  *
 316  * The object is returned with refcounter increased by 1.
 317  */
 318 struct batadv_orig_ifinfo *
 319 batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node,
 320                        struct batadv_hard_iface *if_outgoing)
 321 {
 322         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
 323         unsigned long reset_time;
 324
 325         spin_lock_bh(&orig_node->neigh_list_lock);
 326
 327         orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing);
 328         if (orig_ifinfo)
 329                 goto out;
 330
 331         orig_ifinfo = kzalloc(sizeof(*orig_ifinfo), GFP_ATOMIC);
 332         if (!orig_ifinfo)
 333                 goto out;
 334
 335         if (if_outgoing != BATADV_IF_DEFAULT &&
 336             !atomic_inc_not_zero(&if_outgoing->refcount)) {
 337                 kfree(orig_ifinfo);
 338                 orig_ifinfo = NULL;
 339                 goto out;
 340         }
 341
 342         reset_time = jiffies - 1;
 343         reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 344         orig_ifinfo->batman_seqno_reset = reset_time;
 345         orig_ifinfo->if_outgoing = if_outgoing;
 346         INIT_HLIST_NODE(&orig_ifinfo->list);
 347         atomic_set(&orig_ifinfo->refcount, 2);
 348         hlist_add_head_rcu(&orig_ifinfo->list,
 349                            &orig_node->ifinfo_list);
 350 out:
 351         spin_unlock_bh(&orig_node->neigh_list_lock);
 352         return orig_ifinfo;
 353 }
 354
 355 /**
 356  * batadv_neigh_ifinfo_get - find the ifinfo from an neigh_node
 357  * @neigh_node: the neigh node to be queried
 358  * @if_outgoing: the interface for which the ifinfo should be acquired
 359  *
 360  * The object is returned with refcounter increased by 1.
 361  *
 362  * Returns the requested neigh_ifinfo or NULL if not found
 363  */
 364 struct batadv_neigh_ifinfo *
 365 batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh,
 366                         struct batadv_hard_iface *if_outgoing)
 367 {
 368         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL,
 369                                    *tmp_neigh_ifinfo;
 370
 371         rcu_read_lock();
 372         hlist_for_each_entry_rcu(tmp_neigh_ifinfo, &neigh->ifinfo_list,
 373                                  list) {
 374                 if (tmp_neigh_ifinfo->if_outgoing != if_outgoing)
 375                         continue;
 376
 377                 if (!atomic_inc_not_zero(&tmp_neigh_ifinfo->refcount))
 378                         continue;
 379
 380                 neigh_ifinfo = tmp_neigh_ifinfo;
 381                 break;
 382         }
 383         rcu_read_unlock();
 384
 385         return neigh_ifinfo;
 386 }
 387
 388 /**
 389  * batadv_neigh_ifinfo_new - search and possibly create an neigh_ifinfo object
 390  * @neigh_node: the neigh node to be queried
 391  * @if_outgoing: the interface for which the ifinfo should be acquired
 392  *
 393  * Returns NULL in case of failure or the neigh_ifinfo object for the
 394  * if_outgoing interface otherwise. The object is created and added to the list
 395  * if it does not exist.
 396  *
 397  * The object is returned with refcounter increased by 1.
 398  */
 399 struct batadv_neigh_ifinfo *
 400 batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh,
 401                         struct batadv_hard_iface *if_outgoing)
 402 {
 403         struct batadv_neigh_ifinfo *neigh_ifinfo;
 404
 405         spin_lock_bh(&neigh->ifinfo_lock);
 406
 407         neigh_ifinfo = batadv_neigh_ifinfo_get(neigh, if_outgoing);
 408         if (neigh_ifinfo)
 409                 goto out;
 410
 411         neigh_ifinfo = kzalloc(sizeof(*neigh_ifinfo), GFP_ATOMIC);
 412         if (!neigh_ifinfo)
 413                 goto out;
 414
 415         if (if_outgoing && !atomic_inc_not_zero(&if_outgoing->refcount)) {
 416                 kfree(neigh_ifinfo);
 417                 neigh_ifinfo = NULL;
 418                 goto out;
 419         }
 420
 421         INIT_HLIST_NODE(&neigh_ifinfo->list);
 422         atomic_set(&neigh_ifinfo->refcount, 2);
 423         neigh_ifinfo->if_outgoing = if_outgoing;
 424
 425         hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list);
 426
 427 out:
 428         spin_unlock_bh(&neigh->ifinfo_lock);
 429
 430         return neigh_ifinfo;
 431 }
 432
 433 /**
 434  * batadv_neigh_node_get - retrieve a neighbour from the list
 435  * @orig_node: originator which the neighbour belongs to
 436  * @hard_iface: the interface where this neighbour is connected to
 437  * @addr: the address of the neighbour
 438  *
 439  * Looks for and possibly returns a neighbour belonging to this originator list
 440  * which is connected through the provided hard interface.
 441  * Returns NULL if the neighbour is not found.
 442  */
 443 static struct batadv_neigh_node *
 444 batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
 445                       const struct batadv_hard_iface *hard_iface,
 446                       const u8 *addr)
 447 {
 448         struct batadv_neigh_node *tmp_neigh_node, *res = NULL;
 449
 450         rcu_read_lock();
 451         hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) {
 452                 if (!batadv_compare_eth(tmp_neigh_node->addr, addr))
 453                         continue;
 454
 455                 if (tmp_neigh_node->if_incoming != hard_iface)
 456                         continue;
 457
 458                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 459                         continue;
 460
 461                 res = tmp_neigh_node;
 462                 break;
 463         }
 464         rcu_read_unlock();
 465
 466         return res;
 467 }
 468
 469 /**
 470  * batadv_neigh_node_new - create and init a new neigh_node object
 471  * @orig_node: originator object representing the neighbour
 472  * @hard_iface: the interface where the neighbour is connected to
 473  * @neigh_addr: the mac address of the neighbour interface
 474  *
 475  * Allocates a new neigh_node object and initialises all the generic fields.
 476  * Returns the new object or NULL on failure.
 477  */
 478 struct batadv_neigh_node *
 479 batadv_neigh_node_new(struct batadv_orig_node *orig_node,
 480                       struct batadv_hard_iface *hard_iface,
 481                       const u8 *neigh_addr)
 482 {
 483         struct batadv_neigh_node *neigh_node;
 484
 485         neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr);
 486         if (neigh_node)
 487                 goto out;
 488
 489         neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
 490         if (!neigh_node)
 491                 goto out;
 492
 493         if (!atomic_inc_not_zero(&hard_iface->refcount)) {
 494                 kfree(neigh_node);
 495                 neigh_node = NULL;
 496                 goto out;
 497         }
 498
 499         INIT_HLIST_NODE(&neigh_node->list);
 500         INIT_HLIST_HEAD(&neigh_node->ifinfo_list);
 501         spin_lock_init(&neigh_node->ifinfo_lock);
 502
 503         ether_addr_copy(neigh_node->addr, neigh_addr);
 504         neigh_node->if_incoming = hard_iface;
 505         neigh_node->orig_node = orig_node;
 506
 507         /* extra reference for return */
 508         atomic_set(&neigh_node->refcount, 2);
 509
 510         spin_lock_bh(&orig_node->neigh_list_lock);
 511         hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
 512         spin_unlock_bh(&orig_node->neigh_list_lock);
 513
 514         batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv,
 515                    "Creating new neighbor %pM for orig_node %pM on interface %s\n",
 516                    neigh_addr, orig_node->orig, hard_iface->net_dev->name);
 517
 518 out:
 519         return neigh_node;
 520 }
 521
 522 /**
 523  * batadv_orig_ifinfo_release - release orig_ifinfo from lists and queue for
 524  *  free after rcu grace period
 525  * @orig_ifinfo: the orig_ifinfo object to release
 526  */
 527 static void batadv_orig_ifinfo_release(struct batadv_orig_ifinfo *orig_ifinfo)
 528 {
 529         struct batadv_neigh_node *router;
 530
 531         if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
 532                 batadv_hardif_free_ref(orig_ifinfo->if_outgoing);
 533
 534         /* this is the last reference to this object */
 535         router = rcu_dereference_protected(orig_ifinfo->router, true);
 536         if (router)
 537                 batadv_neigh_node_free_ref(router);
 538
 539         kfree_rcu(orig_ifinfo, rcu);
 540 }
 541
 542 /**
 543  * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly release
 544  *  the orig_ifinfo
 545  * @orig_ifinfo: the orig_ifinfo object to release
 546  */
 547 void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo)
 548 {
 549         if (atomic_dec_and_test(&orig_ifinfo->refcount))
 550                 batadv_orig_ifinfo_release(orig_ifinfo);
 551 }
 552
 553 /**
 554  * batadv_orig_node_free_rcu - free the orig_node
 555  * @rcu: rcu pointer of the orig_node
 556  */
 557 static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 558 {
 559         struct batadv_orig_node *orig_node;
 560
 561         orig_node = container_of(rcu, struct batadv_orig_node, rcu);
 562
 563         batadv_mcast_purge_orig(orig_node);
 564
 565         batadv_frag_purge_orig(orig_node, NULL);
 566
 567         if (orig_node->bat_priv->bat_algo_ops->bat_orig_free)
 568                 orig_node->bat_priv->bat_algo_ops->bat_orig_free(orig_node);
 569
 570         kfree(orig_node->tt_buff);
 571         kfree(orig_node);
 572 }
 573
 574 /**
 575  * batadv_orig_node_release - release orig_node from lists and queue for
 576  *  free after rcu grace period
 577  * @orig_node: the orig node to free
 578  */
 579 static void batadv_orig_node_release(struct batadv_orig_node *orig_node)
 580 {
 581         struct hlist_node *node_tmp;
 582         struct batadv_neigh_node *neigh_node;
 583         struct batadv_orig_ifinfo *orig_ifinfo;
 584
 585         spin_lock_bh(&orig_node->neigh_list_lock);
 586
 587         /* for all neighbors towards this originator ... */
 588         hlist_for_each_entry_safe(neigh_node, node_tmp,
 589                                   &orig_node->neigh_list, list) {
 590                 hlist_del_rcu(&neigh_node->list);
 591                 batadv_neigh_node_free_ref(neigh_node);
 592         }
 593
 594         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 595                                   &orig_node->ifinfo_list, list) {
 596                 hlist_del_rcu(&orig_ifinfo->list);
 597                 batadv_orig_ifinfo_free_ref(orig_ifinfo);
 598         }
 599         spin_unlock_bh(&orig_node->neigh_list_lock);
 600
 601         /* Free nc_nodes */
 602         batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 603
 604         call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
 605 }
 606
 607 /**
 608  * batadv_orig_node_free_ref - decrement the orig node refcounter and possibly
 609  *  release it
 610  * @orig_node: the orig node to free
 611  */
 612 void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
 613 {
 614         if (atomic_dec_and_test(&orig_node->refcount))
 615                 batadv_orig_node_release(orig_node);
 616 }
 617
 618 /**
 619  * batadv_orig_node_free_ref_now - decrement the orig node refcounter and
 620  * possibly free it (without rcu callback)
 621  * @orig_node: the orig node to free
 622  */
 623 void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node)
 624 {
 625         if (atomic_dec_and_test(&orig_node->refcount))
 626                 batadv_orig_node_free_rcu(&orig_node->rcu);
 627 }
 628
 629 void batadv_originator_free(struct batadv_priv *bat_priv)
 630 {
 631         struct batadv_hashtable *hash = bat_priv->orig_hash;
 632         struct hlist_node *node_tmp;
 633         struct hlist_head *head;
 634         spinlock_t *list_lock; /* spinlock to protect write access */
 635         struct batadv_orig_node *orig_node;
 636         u32 i;
 637
 638         if (!hash)
 639                 return;
 640
 641         cancel_delayed_work_sync(&bat_priv->orig_work);
 642
 643         bat_priv->orig_hash = NULL;
 644
 645         for (i = 0; i < hash->size; i++) {
 646                 head = &hash->table[i];
 647                 list_lock = &hash->list_locks[i];
 648
 649                 spin_lock_bh(list_lock);
 650                 hlist_for_each_entry_safe(orig_node, node_tmp,
 651                                           head, hash_entry) {
 652                         hlist_del_rcu(&orig_node->hash_entry);
 653                         batadv_orig_node_free_ref(orig_node);
 654                 }
 655                 spin_unlock_bh(list_lock);
 656         }
 657
 658         batadv_hash_destroy(hash);
 659 }
 660
 661 /**
 662  * batadv_orig_node_new - creates a new orig_node
 663  * @bat_priv: the bat priv with all the soft interface information
 664  * @addr: the mac address of the originator
 665  *
 666  * Creates a new originator object and initialise all the generic fields.
 667  * The new object is not added to the originator list.
 668  * Returns the newly created object or NULL on failure.
 669  */
 670 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
 671                                               const u8 *addr)
 672 {
 673         struct batadv_orig_node *orig_node;
 674         struct batadv_orig_node_vlan *vlan;
 675         unsigned long reset_time;
 676         int i;
 677
 678         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 679                    "Creating new originator: %pM\n", addr);
 680
 681         orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
 682         if (!orig_node)
 683                 return NULL;
 684
 685         INIT_HLIST_HEAD(&orig_node->neigh_list);
 686         INIT_HLIST_HEAD(&orig_node->vlan_list);
 687         INIT_HLIST_HEAD(&orig_node->ifinfo_list);
 688         spin_lock_init(&orig_node->bcast_seqno_lock);
 689         spin_lock_init(&orig_node->neigh_list_lock);
 690         spin_lock_init(&orig_node->tt_buff_lock);
 691         spin_lock_init(&orig_node->tt_lock);
 692         spin_lock_init(&orig_node->vlan_list_lock);
 693
 694         batadv_nc_init_orig(orig_node);
 695
 696         /* extra reference for return */
 697         atomic_set(&orig_node->refcount, 2);
 698
 699         orig_node->bat_priv = bat_priv;
 700         ether_addr_copy(orig_node->orig, addr);
 701         batadv_dat_init_orig_node_addr(orig_node);
 702         atomic_set(&orig_node->last_ttvn, 0);
 703         orig_node->tt_buff = NULL;
 704         orig_node->tt_buff_len = 0;
 705         orig_node->last_seen = jiffies;
 706         reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 707         orig_node->bcast_seqno_reset = reset_time;
 708
 709 #ifdef CONFIG_BATMAN_ADV_MCAST
 710         orig_node->mcast_flags = BATADV_NO_FLAGS;
 711         INIT_HLIST_NODE(&orig_node->mcast_want_all_unsnoopables_node);
 712         INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv4_node);
 713         INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv6_node);
 714         spin_lock_init(&orig_node->mcast_handler_lock);
 715 #endif
 716
 717         /* create a vlan object for the "untagged" LAN */
 718         vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);
 719         if (!vlan)
 720                 goto free_orig_node;
 721         /* batadv_orig_node_vlan_new() increases the refcounter.
 722          * Immediately release vlan since it is not needed anymore in this
 723          * context
 724          */
 725         batadv_orig_node_vlan_free_ref(vlan);
 726
 727         for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
 728                 INIT_HLIST_HEAD(&orig_node->fragments[i].head);
 729                 spin_lock_init(&orig_node->fragments[i].lock);
 730                 orig_node->fragments[i].size = 0;
 731         }
 732
 733         return orig_node;
 734 free_orig_node:
 735         kfree(orig_node);
 736         return NULL;
 737 }
 738
 739 /**
 740  * batadv_purge_neigh_ifinfo - purge obsolete ifinfo entries from neighbor
 741  * @bat_priv: the bat priv with all the soft interface information
 742  * @neigh: orig node which is to be checked
 743  */
 744 static void
 745 batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv,
 746                           struct batadv_neigh_node *neigh)
 747 {
 748         struct batadv_neigh_ifinfo *neigh_ifinfo;
 749         struct batadv_hard_iface *if_outgoing;
 750         struct hlist_node *node_tmp;
 751
 752         spin_lock_bh(&neigh->ifinfo_lock);
 753
 754         /* for all ifinfo objects for this neighinator */
 755         hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
 756                                   &neigh->ifinfo_list, list) {
 757                 if_outgoing = neigh_ifinfo->if_outgoing;
 758
 759                 /* always keep the default interface */
 760                 if (if_outgoing == BATADV_IF_DEFAULT)
 761                         continue;
 762
 763                 /* don't purge if the interface is not (going) down */
 764                 if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
 765                     (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
 766                     (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
 767                         continue;
 768
 769                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 770                            "neighbor/ifinfo purge: neighbor %pM, iface: %s\n",
 771                            neigh->addr, if_outgoing->net_dev->name);
 772
 773                 hlist_del_rcu(&neigh_ifinfo->list);
 774                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
 775         }
 776
 777         spin_unlock_bh(&neigh->ifinfo_lock);
 778 }
 779
 780 /**
 781  * batadv_purge_orig_ifinfo - purge obsolete ifinfo entries from originator
 782  * @bat_priv: the bat priv with all the soft interface information
 783  * @orig_node: orig node which is to be checked
 784  *
 785  * Returns true if any ifinfo entry was purged, false otherwise.
 786  */
 787 static bool
 788 batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv,
 789                          struct batadv_orig_node *orig_node)
 790 {
 791         struct batadv_orig_ifinfo *orig_ifinfo;
 792         struct batadv_hard_iface *if_outgoing;
 793         struct hlist_node *node_tmp;
 794         bool ifinfo_purged = false;
 795
 796         spin_lock_bh(&orig_node->neigh_list_lock);
 797
 798         /* for all ifinfo objects for this originator */
 799         hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
 800                                   &orig_node->ifinfo_list, list) {
 801                 if_outgoing = orig_ifinfo->if_outgoing;
 802
 803                 /* always keep the default interface */
 804                 if (if_outgoing == BATADV_IF_DEFAULT)
 805                         continue;
 806
 807                 /* don't purge if the interface is not (going) down */
 808                 if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
 809                     (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
 810                     (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
 811                         continue;
 812
 813                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 814                            "router/ifinfo purge: originator %pM, iface: %s\n",
 815                            orig_node->orig, if_outgoing->net_dev->name);
 816
 817                 ifinfo_purged = true;
 818
 819                 hlist_del_rcu(&orig_ifinfo->list);
 820                 batadv_orig_ifinfo_free_ref(orig_ifinfo);
 821                 if (orig_node->last_bonding_candidate == orig_ifinfo) {
 822                         orig_node->last_bonding_candidate = NULL;
 823                         batadv_orig_ifinfo_free_ref(orig_ifinfo);
 824                 }
 825         }
 826
 827         spin_unlock_bh(&orig_node->neigh_list_lock);
 828
 829         return ifinfo_purged;
 830 }
 831
 832 /**
 833  * batadv_purge_orig_neighbors - purges neighbors from originator
 834  * @bat_priv: the bat priv with all the soft interface information
 835  * @orig_node: orig node which is to be checked
 836  *
 837  * Returns true if any neighbor was purged, false otherwise
 838  */
 839 static bool
 840 batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
 841                             struct batadv_orig_node *orig_node)
 842 {
 843         struct hlist_node *node_tmp;
 844         struct batadv_neigh_node *neigh_node;
 845         bool neigh_purged = false;
 846         unsigned long last_seen;
 847         struct batadv_hard_iface *if_incoming;
 848
 849         spin_lock_bh(&orig_node->neigh_list_lock);
 850
 851         /* for all neighbors towards this originator ... */
 852         hlist_for_each_entry_safe(neigh_node, node_tmp,
 853                                   &orig_node->neigh_list, list) {
 854                 last_seen = neigh_node->last_seen;
 855                 if_incoming = neigh_node->if_incoming;
 856
 857                 if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) ||
 858                     (if_incoming->if_status == BATADV_IF_INACTIVE) ||
 859                     (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 860                     (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) {
 861                         if ((if_incoming->if_status == BATADV_IF_INACTIVE) ||
 862                             (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 863                             (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED))
 864                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 865                                            "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
 866                                            orig_node->orig, neigh_node->addr,
 867                                            if_incoming->net_dev->name);
 868                         else
 869                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 870                                            "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
 871                                            orig_node->orig, neigh_node->addr,
 872                                            jiffies_to_msecs(last_seen));
 873
 874                         neigh_purged = true;
 875
 876                         hlist_del_rcu(&neigh_node->list);
 877                         batadv_neigh_node_free_ref(neigh_node);
 878                 } else {
 879                         /* only necessary if not the whole neighbor is to be
 880                          * deleted, but some interface has been removed.
 881                          */
 882                         batadv_purge_neigh_ifinfo(bat_priv, neigh_node);
 883                 }
 884         }
 885
 886         spin_unlock_bh(&orig_node->neigh_list_lock);
 887         return neigh_purged;
 888 }
 889
 890 /**
 891  * batadv_find_best_neighbor - finds the best neighbor after purging
 892  * @bat_priv: the bat priv with all the soft interface information
 893  * @orig_node: orig node which is to be checked
 894  * @if_outgoing: the interface for which the metric should be compared
 895  *
 896  * Returns the current best neighbor, with refcount increased.
 897  */
 898 static struct batadv_neigh_node *
 899 batadv_find_best_neighbor(struct batadv_priv *bat_priv,
 900                           struct batadv_orig_node *orig_node,
 901                           struct batadv_hard_iface *if_outgoing)
 902 {
 903         struct batadv_neigh_node *best = NULL, *neigh;
 904         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
 905
 906         rcu_read_lock();
 907         hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) {
 908                 if (best && (bao->bat_neigh_cmp(neigh, if_outgoing,
 909                                                 best, if_outgoing) <= 0))
 910                         continue;
 911
 912                 if (!atomic_inc_not_zero(&neigh->refcount))
 913                         continue;
 914
 915                 if (best)
 916                         batadv_neigh_node_free_ref(best);
 917
 918                 best = neigh;
 919         }
 920         rcu_read_unlock();
 921
 922         return best;
 923 }
 924
 925 /**
 926  * batadv_purge_orig_node - purges obsolete information from an orig_node
 927  * @bat_priv: the bat priv with all the soft interface information
 928  * @orig_node: orig node which is to be checked
 929  *
 930  * This function checks if the orig_node or substructures of it have become
 931  * obsolete, and purges this information if that's the case.
 932  *
 933  * Returns true if the orig_node is to be removed, false otherwise.
 934  */
 935 static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
 936                                    struct batadv_orig_node *orig_node)
 937 {
 938         struct batadv_neigh_node *best_neigh_node;
 939         struct batadv_hard_iface *hard_iface;
 940         bool changed_ifinfo, changed_neigh;
 941
 942         if (batadv_has_timed_out(orig_node->last_seen,
 943                                  2 * BATADV_PURGE_TIMEOUT)) {
 944                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 945                            "Originator timeout: originator %pM, last_seen %u\n",
 946                            orig_node->orig,
 947                            jiffies_to_msecs(orig_node->last_seen));
 948                 return true;
 949         }
 950         changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node);
 951         changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node);
 952
 953         if (!changed_ifinfo && !changed_neigh)
 954                 return false;
 955
 956         /* first for NULL ... */
 957         best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node,
 958                                                     BATADV_IF_DEFAULT);
 959         batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT,
 960                             best_neigh_node);
 961         if (best_neigh_node)
 962                 batadv_neigh_node_free_ref(best_neigh_node);
 963
 964         /* ... then for all other interfaces. */
 965         rcu_read_lock();
 966         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 967                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
 968                         continue;
 969
 970                 if (hard_iface->soft_iface != bat_priv->soft_iface)
 971                         continue;
 972
 973                 best_neigh_node = batadv_find_best_neighbor(bat_priv,
 974                                                             orig_node,
 975                                                             hard_iface);
 976                 batadv_update_route(bat_priv, orig_node, hard_iface,
 977                                     best_neigh_node);
 978                 if (best_neigh_node)
 979                         batadv_neigh_node_free_ref(best_neigh_node);
 980         }
 981         rcu_read_unlock();
 982
 983         return false;
 984 }
 985
 986 static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 987 {
 988         struct batadv_hashtable *hash = bat_priv->orig_hash;
 989         struct hlist_node *node_tmp;
 990         struct hlist_head *head;
 991         spinlock_t *list_lock; /* spinlock to protect write access */
 992         struct batadv_orig_node *orig_node;
 993         u32 i;
 994
 995         if (!hash)
 996                 return;
 997
 998         /* for all origins... */
 999         for (i = 0; i < hash->size; i++) {
1000                 head = &hash->table[i];
1001                 list_lock = &hash->list_locks[i];
1002
1003                 spin_lock_bh(list_lock);
1004                 hlist_for_each_entry_safe(orig_node, node_tmp,
1005                                           head, hash_entry) {
1006                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
1007                                 batadv_gw_node_delete(bat_priv, orig_node);
1008                                 hlist_del_rcu(&orig_node->hash_entry);
1009                                 batadv_tt_global_del_orig(orig_node->bat_priv,
1010                                                           orig_node, -1,
1011                                                           "originator timed out");
1012                                 batadv_orig_node_free_ref(orig_node);
1013                                 continue;
1014                         }
1015
1016                         batadv_frag_purge_orig(orig_node,
1017                                                batadv_frag_check_entry);
1018                 }
1019                 spin_unlock_bh(list_lock);
1020         }
1021
1022         batadv_gw_election(bat_priv);
1023 }
1024
1025 static void batadv_purge_orig(struct work_struct *work)
1026 {
1027         struct delayed_work *delayed_work;
1028         struct batadv_priv *bat_priv;
1029
1030         delayed_work = container_of(work, struct delayed_work, work);
1031         bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
1032         _batadv_purge_orig(bat_priv);
1033         queue_delayed_work(batadv_event_workqueue,
1034                            &bat_priv->orig_work,
1035                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
1036 }
1037
1038 void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
1039 {
1040         _batadv_purge_orig(bat_priv);
1041 }
1042
1043 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
1044 {
1045         struct net_device *net_dev = (struct net_device *)seq->private;
1046         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1047         struct batadv_hard_iface *primary_if;
1048
1049         primary_if = batadv_seq_print_text_primary_if_get(seq);
1050         if (!primary_if)
1051                 return 0;
1052
1053         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
1054                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
1055                    primary_if->net_dev->dev_addr, net_dev->name,
1056                    bat_priv->bat_algo_ops->name);
1057
1058         batadv_hardif_free_ref(primary_if);
1059
1060         if (!bat_priv->bat_algo_ops->bat_orig_print) {
1061                 seq_puts(seq,
1062                          "No printing function for this routing protocol\n");
1063                 return 0;
1064         }
1065
1066         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq,
1067                                                BATADV_IF_DEFAULT);
1068
1069         return 0;
1070 }
1071
1072 /**
1073  * batadv_orig_hardif_seq_print_text - writes originator infos for a specific
1074  *  outgoing interface
1075  * @seq: debugfs table seq_file struct
1076  * @offset: not used
1077  *
1078  * Returns 0
1079  */
1080 int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset)
1081 {
1082         struct net_device *net_dev = (struct net_device *)seq->private;
1083         struct batadv_hard_iface *hard_iface;
1084         struct batadv_priv *bat_priv;
1085
1086         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1087
1088         if (!hard_iface || !hard_iface->soft_iface) {
1089                 seq_puts(seq, "Interface not known to B.A.T.M.A.N.\n");
1090                 goto out;
1091         }
1092
1093         bat_priv = netdev_priv(hard_iface->soft_iface);
1094         if (!bat_priv->bat_algo_ops->bat_orig_print) {
1095                 seq_puts(seq,
1096                          "No printing function for this routing protocol\n");
1097                 goto out;
1098         }
1099
1100         if (hard_iface->if_status != BATADV_IF_ACTIVE) {
1101                 seq_puts(seq, "Interface not active\n");
1102                 goto out;
1103         }
1104
1105         seq_printf(seq, "[B.A.T.M.A.N. adv %s, IF/MAC: %s/%pM (%s %s)]\n",
1106                    BATADV_SOURCE_VERSION, hard_iface->net_dev->name,
1107                    hard_iface->net_dev->dev_addr,
1108                    hard_iface->soft_iface->name, bat_priv->bat_algo_ops->name);
1109
1110         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, hard_iface);
1111
1112 out:
1113         if (hard_iface)
1114                 batadv_hardif_free_ref(hard_iface);
1115         return 0;
1116 }
1117
1118 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
1119                             int max_if_num)
1120 {
1121         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
1122         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1123         struct batadv_hashtable *hash = bat_priv->orig_hash;
1124         struct hlist_head *head;
1125         struct batadv_orig_node *orig_node;
1126         u32 i;
1127         int ret;
1128
1129         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1130          * if_num
1131          */
1132         for (i = 0; i < hash->size; i++) {
1133                 head = &hash->table[i];
1134
1135                 rcu_read_lock();
1136                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1137                         ret = 0;
1138                         if (bao->bat_orig_add_if)
1139                                 ret = bao->bat_orig_add_if(orig_node,
1140                                                            max_if_num);
1141                         if (ret == -ENOMEM)
1142                                 goto err;
1143                 }
1144                 rcu_read_unlock();
1145         }
1146
1147         return 0;
1148
1149 err:
1150         rcu_read_unlock();
1151         return -ENOMEM;
1152 }
1153
1154 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
1155                             int max_if_num)
1156 {
1157         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
1158         struct batadv_hashtable *hash = bat_priv->orig_hash;
1159         struct hlist_head *head;
1160         struct batadv_hard_iface *hard_iface_tmp;
1161         struct batadv_orig_node *orig_node;
1162         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1163         u32 i;
1164         int ret;
1165
1166         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
1167          * if_num
1168          */
1169         for (i = 0; i < hash->size; i++) {
1170                 head = &hash->table[i];
1171
1172                 rcu_read_lock();
1173                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1174                         ret = 0;
1175                         if (bao->bat_orig_del_if)
1176                                 ret = bao->bat_orig_del_if(orig_node,
1177                                                            max_if_num,
1178                                                            hard_iface->if_num);
1179                         if (ret == -ENOMEM)
1180                                 goto err;
1181                 }
1182                 rcu_read_unlock();
1183         }
1184
1185         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
1186         rcu_read_lock();
1187         list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) {
1188                 if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE)
1189                         continue;
1190
1191                 if (hard_iface == hard_iface_tmp)
1192                         continue;
1193
1194                 if (hard_iface->soft_iface != hard_iface_tmp->soft_iface)
1195                         continue;
1196
1197                 if (hard_iface_tmp->if_num > hard_iface->if_num)
1198                         hard_iface_tmp->if_num--;
1199         }
1200         rcu_read_unlock();
1201
1202         hard_iface->if_num = -1;
1203         return 0;
1204
1205 err:
1206         rcu_read_unlock();
1207         return -ENOMEM;
1208 }