net/batman-adv/originator.c

   1 /*
   2  * Copyright (C) 2009-2011 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 /* increase the reference counter for this originator */
  23
  24 #include "main.h"
  25 #include "originator.h"
  26 #include "hash.h"
  27 #include "translation-table.h"
  28 #include "routing.h"
  29 #include "gateway_client.h"
  30 #include "hard-interface.h"
  31 #include "unicast.h"
  32 #include "soft-interface.h"
  33
  34 static void purge_orig(struct work_struct *work);
  35
  36 static void start_purge_timer(struct bat_priv *bat_priv)
  37 {
  38         INIT_DELAYED_WORK(&bat_priv->orig_work, purge_orig);
  39         queue_delayed_work(bat_event_workqueue, &bat_priv->orig_work, 1 * HZ);
  40 }
  41
  42 int originator_init(struct bat_priv *bat_priv)
  43 {
  44         if (bat_priv->orig_hash)
  45                 return 1;
  46
  47         bat_priv->orig_hash = hash_new(1024);
  48
  49         if (!bat_priv->orig_hash)
  50                 goto err;
  51
  52         start_purge_timer(bat_priv);
  53         return 1;
  54
  55 err:
  56         return 0;
  57 }
  58
  59 void neigh_node_free_ref(struct neigh_node *neigh_node)
  60 {
  61         if (atomic_dec_and_test(&neigh_node->refcount))
  62                 kfree_rcu(neigh_node, rcu);
  63 }
  64
  65 struct neigh_node *create_neighbor(struct orig_node *orig_node,
  66                                    struct orig_node *orig_neigh_node,
  67                                    uint8_t *neigh,
  68                                    struct hard_iface *if_incoming)
  69 {
  70         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
  71         struct neigh_node *neigh_node;
  72
  73         bat_dbg(DBG_BATMAN, bat_priv,
  74                 "Creating new last-hop neighbor of originator\n");
  75
  76         neigh_node = kzalloc(sizeof(struct neigh_node), GFP_ATOMIC);
  77         if (!neigh_node)
  78                 return NULL;
  79
  80         INIT_HLIST_NODE(&neigh_node->list);
  81         INIT_LIST_HEAD(&neigh_node->bonding_list);
  82
  83         memcpy(neigh_node->addr, neigh, ETH_ALEN);
  84         neigh_node->orig_node = orig_neigh_node;
  85         neigh_node->if_incoming = if_incoming;
  86
  87         /* extra reference for return */
  88         atomic_set(&neigh_node->refcount, 2);
  89
  90         spin_lock_bh(&orig_node->neigh_list_lock);
  91         hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
  92         spin_unlock_bh(&orig_node->neigh_list_lock);
  93         return neigh_node;
  94 }
  95
  96 static void orig_node_free_rcu(struct rcu_head *rcu)
  97 {
  98         struct hlist_node *node, *node_tmp;
  99         struct neigh_node *neigh_node, *tmp_neigh_node;
 100         struct orig_node *orig_node;
 101
 102         orig_node = container_of(rcu, struct orig_node, rcu);
 103
 104         spin_lock_bh(&orig_node->neigh_list_lock);
 105
 106         /* for all bonding members ... */
 107         list_for_each_entry_safe(neigh_node, tmp_neigh_node,
 108                                  &orig_node->bond_list, bonding_list) {
 109                 list_del_rcu(&neigh_node->bonding_list);
 110                 neigh_node_free_ref(neigh_node);
 111         }
 112
 113         /* for all neighbors towards this originator ... */
 114         hlist_for_each_entry_safe(neigh_node, node, node_tmp,
 115                                   &orig_node->neigh_list, list) {
 116                 hlist_del_rcu(&neigh_node->list);
 117                 neigh_node_free_ref(neigh_node);
 118         }
 119
 120         spin_unlock_bh(&orig_node->neigh_list_lock);
 121
 122         frag_list_free(&orig_node->frag_list);
 123         hna_global_del_orig(orig_node->bat_priv, orig_node,
 124                             "originator timed out");
 125
 126         kfree(orig_node->bcast_own);
 127         kfree(orig_node->bcast_own_sum);
 128         kfree(orig_node);
 129 }
 130
 131 void orig_node_free_ref(struct orig_node *orig_node)
 132 {
 133         if (atomic_dec_and_test(&orig_node->refcount))
 134                 call_rcu(&orig_node->rcu, orig_node_free_rcu);
 135 }
 136
 137 void originator_free(struct bat_priv *bat_priv)
 138 {
 139         struct hashtable_t *hash = bat_priv->orig_hash;
 140         struct hlist_node *node, *node_tmp;
 141         struct hlist_head *head;
 142         spinlock_t *list_lock; /* spinlock to protect write access */
 143         struct orig_node *orig_node;
 144         int i;
 145
 146         if (!hash)
 147                 return;
 148
 149         cancel_delayed_work_sync(&bat_priv->orig_work);
 150
 151         bat_priv->orig_hash = NULL;
 152
 153         for (i = 0; i < hash->size; i++) {
 154                 head = &hash->table[i];
 155                 list_lock = &hash->list_locks[i];
 156
 157                 spin_lock_bh(list_lock);
 158                 hlist_for_each_entry_safe(orig_node, node, node_tmp,
 159                                           head, hash_entry) {
 160
 161                         hlist_del_rcu(node);
 162                         orig_node_free_ref(orig_node);
 163                 }
 164                 spin_unlock_bh(list_lock);
 165         }
 166
 167         hash_destroy(hash);
 168 }
 169
 170 /* this function finds or creates an originator entry for the given
 171  * address if it does not exits */
 172 struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr)
 173 {
 174         struct orig_node *orig_node;
 175         int size;
 176         int hash_added;
 177
 178         orig_node = orig_hash_find(bat_priv, addr);
 179         if (orig_node)
 180                 return orig_node;
 181
 182         bat_dbg(DBG_BATMAN, bat_priv,
 183                 "Creating new originator: %pM\n", addr);
 184
 185         orig_node = kzalloc(sizeof(struct orig_node), GFP_ATOMIC);
 186         if (!orig_node)
 187                 return NULL;
 188
 189         INIT_HLIST_HEAD(&orig_node->neigh_list);
 190         INIT_LIST_HEAD(&orig_node->bond_list);
 191         spin_lock_init(&orig_node->ogm_cnt_lock);
 192         spin_lock_init(&orig_node->bcast_seqno_lock);
 193         spin_lock_init(&orig_node->neigh_list_lock);
 194
 195         /* extra reference for return */
 196         atomic_set(&orig_node->refcount, 2);
 197
 198         orig_node->bat_priv = bat_priv;
 199         memcpy(orig_node->orig, addr, ETH_ALEN);
 200         orig_node->router = NULL;
 201         orig_node->hna_buff = NULL;
 202         orig_node->bcast_seqno_reset = jiffies - 1
 203                                         - msecs_to_jiffies(RESET_PROTECTION_MS);
 204         orig_node->batman_seqno_reset = jiffies - 1
 205                                         - msecs_to_jiffies(RESET_PROTECTION_MS);
 206
 207         atomic_set(&orig_node->bond_candidates, 0);
 208
 209         size = bat_priv->num_ifaces * sizeof(unsigned long) * NUM_WORDS;
 210
 211         orig_node->bcast_own = kzalloc(size, GFP_ATOMIC);
 212         if (!orig_node->bcast_own)
 213                 goto free_orig_node;
 214
 215         size = bat_priv->num_ifaces * sizeof(uint8_t);
 216         orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 217
 218         INIT_LIST_HEAD(&orig_node->frag_list);
 219         orig_node->last_frag_packet = 0;
 220
 221         if (!orig_node->bcast_own_sum)
 222                 goto free_bcast_own;
 223
 224         hash_added = hash_add(bat_priv->orig_hash, compare_orig,
 225                               choose_orig, orig_node, &orig_node->hash_entry);
 226         if (hash_added < 0)
 227                 goto free_bcast_own_sum;
 228
 229         return orig_node;
 230 free_bcast_own_sum:
 231         kfree(orig_node->bcast_own_sum);
 232 free_bcast_own:
 233         kfree(orig_node->bcast_own);
 234 free_orig_node:
 235         kfree(orig_node);
 236         return NULL;
 237 }
 238
 239 static bool purge_orig_neighbors(struct bat_priv *bat_priv,
 240                                  struct orig_node *orig_node,
 241                                  struct neigh_node **best_neigh_node)
 242 {
 243         struct hlist_node *node, *node_tmp;
 244         struct neigh_node *neigh_node;
 245         bool neigh_purged = false;
 246
 247         *best_neigh_node = NULL;
 248
 249         spin_lock_bh(&orig_node->neigh_list_lock);
 250
 251         /* for all neighbors towards this originator ... */
 252         hlist_for_each_entry_safe(neigh_node, node, node_tmp,
 253                                   &orig_node->neigh_list, list) {
 254
 255                 if ((time_after(jiffies,
 256                         neigh_node->last_valid + PURGE_TIMEOUT * HZ)) ||
 257                     (neigh_node->if_incoming->if_status == IF_INACTIVE) ||
 258                     (neigh_node->if_incoming->if_status == IF_NOT_IN_USE) ||
 259                     (neigh_node->if_incoming->if_status == IF_TO_BE_REMOVED)) {
 260
 261                         if ((neigh_node->if_incoming->if_status ==
 262                                                                 IF_INACTIVE) ||
 263                             (neigh_node->if_incoming->if_status ==
 264                                                         IF_NOT_IN_USE) ||
 265                             (neigh_node->if_incoming->if_status ==
 266                                                         IF_TO_BE_REMOVED))
 267                                 bat_dbg(DBG_BATMAN, bat_priv,
 268                                         "neighbor purge: originator %pM, "
 269                                         "neighbor: %pM, iface: %s\n",
 270                                         orig_node->orig, neigh_node->addr,
 271                                         neigh_node->if_incoming->net_dev->name);
 272                         else
 273                                 bat_dbg(DBG_BATMAN, bat_priv,
 274                                         "neighbor timeout: originator %pM, "
 275                                         "neighbor: %pM, last_valid: %lu\n",
 276                                         orig_node->orig, neigh_node->addr,
 277                                         (neigh_node->last_valid / HZ));
 278
 279                         neigh_purged = true;
 280
 281                         hlist_del_rcu(&neigh_node->list);
 282                         bonding_candidate_del(orig_node, neigh_node);
 283                         neigh_node_free_ref(neigh_node);
 284                 } else {
 285                         if ((!*best_neigh_node) ||
 286                             (neigh_node->tq_avg > (*best_neigh_node)->tq_avg))
 287                                 *best_neigh_node = neigh_node;
 288                 }
 289         }
 290
 291         spin_unlock_bh(&orig_node->neigh_list_lock);
 292         return neigh_purged;
 293 }
 294
 295 static bool purge_orig_node(struct bat_priv *bat_priv,
 296                             struct orig_node *orig_node)
 297 {
 298         struct neigh_node *best_neigh_node;
 299
 300         if (time_after(jiffies,
 301                 orig_node->last_valid + 2 * PURGE_TIMEOUT * HZ)) {
 302
 303                 bat_dbg(DBG_BATMAN, bat_priv,
 304                         "Originator timeout: originator %pM, last_valid %lu\n",
 305                         orig_node->orig, (orig_node->last_valid / HZ));
 306                 return true;
 307         } else {
 308                 if (purge_orig_neighbors(bat_priv, orig_node,
 309                                                         &best_neigh_node)) {
 310                         update_routes(bat_priv, orig_node,
 311                                       best_neigh_node,
 312                                       orig_node->hna_buff,
 313                                       orig_node->hna_buff_len);
 314                 }
 315         }
 316
 317         return false;
 318 }
 319
 320 static void _purge_orig(struct bat_priv *bat_priv)
 321 {
 322         struct hashtable_t *hash = bat_priv->orig_hash;
 323         struct hlist_node *node, *node_tmp;
 324         struct hlist_head *head;
 325         spinlock_t *list_lock; /* spinlock to protect write access */
 326         struct orig_node *orig_node;
 327         int i;
 328
 329         if (!hash)
 330                 return;
 331
 332         /* for all origins... */
 333         for (i = 0; i < hash->size; i++) {
 334                 head = &hash->table[i];
 335                 list_lock = &hash->list_locks[i];
 336
 337                 spin_lock_bh(list_lock);
 338                 hlist_for_each_entry_safe(orig_node, node, node_tmp,
 339                                           head, hash_entry) {
 340                         if (purge_orig_node(bat_priv, orig_node)) {
 341                                 if (orig_node->gw_flags)
 342                                         gw_node_delete(bat_priv, orig_node);
 343                                 hlist_del_rcu(node);
 344                                 orig_node_free_ref(orig_node);
 345                                 continue;
 346                         }
 347
 348                         if (time_after(jiffies, orig_node->last_frag_packet +
 349                                                 msecs_to_jiffies(FRAG_TIMEOUT)))
 350                                 frag_list_free(&orig_node->frag_list);
 351                 }
 352                 spin_unlock_bh(list_lock);
 353         }
 354
 355         gw_node_purge(bat_priv);
 356         gw_election(bat_priv);
 357
 358         softif_neigh_purge(bat_priv);
 359 }
 360
 361 static void purge_orig(struct work_struct *work)
 362 {
 363         struct delayed_work *delayed_work =
 364                 container_of(work, struct delayed_work, work);
 365         struct bat_priv *bat_priv =
 366                 container_of(delayed_work, struct bat_priv, orig_work);
 367
 368         _purge_orig(bat_priv);
 369         start_purge_timer(bat_priv);
 370 }
 371
 372 void purge_orig_ref(struct bat_priv *bat_priv)
 373 {
 374         _purge_orig(bat_priv);
 375 }
 376
 377 int orig_seq_print_text(struct seq_file *seq, void *offset)
 378 {
 379         struct net_device *net_dev = (struct net_device *)seq->private;
 380         struct bat_priv *bat_priv = netdev_priv(net_dev);
 381         struct hashtable_t *hash = bat_priv->orig_hash;
 382         struct hlist_node *node, *node_tmp;
 383         struct hlist_head *head;
 384         struct orig_node *orig_node;
 385         struct neigh_node *neigh_node;
 386         int batman_count = 0;
 387         int last_seen_secs;
 388         int last_seen_msecs;
 389         int i;
 390
 391         if ((!bat_priv->primary_if) ||
 392             (bat_priv->primary_if->if_status != IF_ACTIVE)) {
 393                 if (!bat_priv->primary_if)
 394                         return seq_printf(seq, "BATMAN mesh %s disabled - "
 395                                      "please specify interfaces to enable it\n",
 396                                      net_dev->name);
 397
 398                 return seq_printf(seq, "BATMAN mesh %s "
 399                                   "disabled - primary interface not active\n",
 400                                   net_dev->name);
 401         }
 402
 403         seq_printf(seq, "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n",
 404                    SOURCE_VERSION, REVISION_VERSION_STR,
 405                    bat_priv->primary_if->net_dev->name,
 406                    bat_priv->primary_if->net_dev->dev_addr, net_dev->name);
 407         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
 408                    "Originator", "last-seen", "#", TQ_MAX_VALUE, "Nexthop",
 409                    "outgoingIF", "Potential nexthops");
 410
 411         for (i = 0; i < hash->size; i++) {
 412                 head = &hash->table[i];
 413
 414                 rcu_read_lock();
 415                 hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
 416                         if (!orig_node->router)
 417                                 continue;
 418
 419                         if (orig_node->router->tq_avg == 0)
 420                                 continue;
 421
 422                         last_seen_secs = jiffies_to_msecs(jiffies -
 423                                                 orig_node->last_valid) / 1000;
 424                         last_seen_msecs = jiffies_to_msecs(jiffies -
 425                                                 orig_node->last_valid) % 1000;
 426
 427                         neigh_node = orig_node->router;
 428                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
 429                                    orig_node->orig, last_seen_secs,
 430                                    last_seen_msecs, neigh_node->tq_avg,
 431                                    neigh_node->addr,
 432                                    neigh_node->if_incoming->net_dev->name);
 433
 434                         hlist_for_each_entry_rcu(neigh_node, node_tmp,
 435                                                  &orig_node->neigh_list, list) {
 436                                 seq_printf(seq, " %pM (%3i)", neigh_node->addr,
 437                                                 neigh_node->tq_avg);
 438                         }
 439
 440                         seq_printf(seq, "\n");
 441                         batman_count++;
 442                 }
 443                 rcu_read_unlock();
 444         }
 445
 446         if ((batman_count == 0))
 447                 seq_printf(seq, "No batman nodes in range ...\n");
 448
 449         return 0;
 450 }
 451
 452 static int orig_node_add_if(struct orig_node *orig_node, int max_if_num)
 453 {
 454         void *data_ptr;
 455
 456         data_ptr = kmalloc(max_if_num * sizeof(unsigned long) * NUM_WORDS,
 457                            GFP_ATOMIC);
 458         if (!data_ptr) {
 459                 pr_err("Can't resize orig: out of memory\n");
 460                 return -1;
 461         }
 462
 463         memcpy(data_ptr, orig_node->bcast_own,
 464                (max_if_num - 1) * sizeof(unsigned long) * NUM_WORDS);
 465         kfree(orig_node->bcast_own);
 466         orig_node->bcast_own = data_ptr;
 467
 468         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 469         if (!data_ptr) {
 470                 pr_err("Can't resize orig: out of memory\n");
 471                 return -1;
 472         }
 473
 474         memcpy(data_ptr, orig_node->bcast_own_sum,
 475                (max_if_num - 1) * sizeof(uint8_t));
 476         kfree(orig_node->bcast_own_sum);
 477         orig_node->bcast_own_sum = data_ptr;
 478
 479         return 0;
 480 }
 481
 482 int orig_hash_add_if(struct hard_iface *hard_iface, int max_if_num)
 483 {
 484         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 485         struct hashtable_t *hash = bat_priv->orig_hash;
 486         struct hlist_node *node;
 487         struct hlist_head *head;
 488         struct orig_node *orig_node;
 489         int i, ret;
 490
 491         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 492          * if_num */
 493         for (i = 0; i < hash->size; i++) {
 494                 head = &hash->table[i];
 495
 496                 rcu_read_lock();
 497                 hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
 498                         spin_lock_bh(&orig_node->ogm_cnt_lock);
 499                         ret = orig_node_add_if(orig_node, max_if_num);
 500                         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 501
 502                         if (ret == -1)
 503                                 goto err;
 504                 }
 505                 rcu_read_unlock();
 506         }
 507
 508         return 0;
 509
 510 err:
 511         rcu_read_unlock();
 512         return -ENOMEM;
 513 }
 514
 515 static int orig_node_del_if(struct orig_node *orig_node,
 516                      int max_if_num, int del_if_num)
 517 {
 518         void *data_ptr = NULL;
 519         int chunk_size;
 520
 521         /* last interface was removed */
 522         if (max_if_num == 0)
 523                 goto free_bcast_own;
 524
 525         chunk_size = sizeof(unsigned long) * NUM_WORDS;
 526         data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC);
 527         if (!data_ptr) {
 528                 pr_err("Can't resize orig: out of memory\n");
 529                 return -1;
 530         }
 531
 532         /* copy first part */
 533         memcpy(data_ptr, orig_node->bcast_own, del_if_num * chunk_size);
 534
 535         /* copy second part */
 536         memcpy(data_ptr + del_if_num * chunk_size,
 537                orig_node->bcast_own + ((del_if_num + 1) * chunk_size),
 538                (max_if_num - del_if_num) * chunk_size);
 539
 540 free_bcast_own:
 541         kfree(orig_node->bcast_own);
 542         orig_node->bcast_own = data_ptr;
 543
 544         if (max_if_num == 0)
 545                 goto free_own_sum;
 546
 547         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 548         if (!data_ptr) {
 549                 pr_err("Can't resize orig: out of memory\n");
 550                 return -1;
 551         }
 552
 553         memcpy(data_ptr, orig_node->bcast_own_sum,
 554                del_if_num * sizeof(uint8_t));
 555
 556         memcpy(data_ptr + del_if_num * sizeof(uint8_t),
 557                orig_node->bcast_own_sum + ((del_if_num + 1) * sizeof(uint8_t)),
 558                (max_if_num - del_if_num) * sizeof(uint8_t));
 559
 560 free_own_sum:
 561         kfree(orig_node->bcast_own_sum);
 562         orig_node->bcast_own_sum = data_ptr;
 563
 564         return 0;
 565 }
 566
 567 int orig_hash_del_if(struct hard_iface *hard_iface, int max_if_num)
 568 {
 569         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 570         struct hashtable_t *hash = bat_priv->orig_hash;
 571         struct hlist_node *node;
 572         struct hlist_head *head;
 573         struct hard_iface *hard_iface_tmp;
 574         struct orig_node *orig_node;
 575         int i, ret;
 576
 577         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 578          * if_num */
 579         for (i = 0; i < hash->size; i++) {
 580                 head = &hash->table[i];
 581
 582                 rcu_read_lock();
 583                 hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
 584                         spin_lock_bh(&orig_node->ogm_cnt_lock);
 585                         ret = orig_node_del_if(orig_node, max_if_num,
 586                                         hard_iface->if_num);
 587                         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 588
 589                         if (ret == -1)
 590                                 goto err;
 591                 }
 592                 rcu_read_unlock();
 593         }
 594
 595         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
 596         rcu_read_lock();
 597         list_for_each_entry_rcu(hard_iface_tmp, &hardif_list, list) {
 598                 if (hard_iface_tmp->if_status == IF_NOT_IN_USE)
 599                         continue;
 600
 601                 if (hard_iface == hard_iface_tmp)
 602                         continue;
 603
 604                 if (hard_iface->soft_iface != hard_iface_tmp->soft_iface)
 605                         continue;
 606
 607                 if (hard_iface_tmp->if_num > hard_iface->if_num)
 608                         hard_iface_tmp->if_num--;
 609         }
 610         rcu_read_unlock();
 611
 612         hard_iface->if_num = -1;
 613         return 0;
 614
 615 err:
 616         rcu_read_unlock();
 617         return -ENOMEM;
 618 }