net/batman-adv/originator.c

   1 /*
   2  * Copyright (C) 2009-2010 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         spin_lock_bh(&bat_priv->orig_hash_lock);
  48         bat_priv->orig_hash = hash_new(1024);
  49
  50         if (!bat_priv->orig_hash)
  51                 goto err;
  52
  53         spin_unlock_bh(&bat_priv->orig_hash_lock);
  54         start_purge_timer(bat_priv);
  55         return 1;
  56
  57 err:
  58         spin_unlock_bh(&bat_priv->orig_hash_lock);
  59         return 0;
  60 }
  61
  62 struct neigh_node *
  63 create_neighbor(struct orig_node *orig_node, struct orig_node *orig_neigh_node,
  64                 uint8_t *neigh, struct batman_if *if_incoming)
  65 {
  66         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
  67         struct neigh_node *neigh_node;
  68
  69         bat_dbg(DBG_BATMAN, bat_priv,
  70                 "Creating new last-hop neighbor of originator\n");
  71
  72         neigh_node = kzalloc(sizeof(struct neigh_node), GFP_ATOMIC);
  73         if (!neigh_node)
  74                 return NULL;
  75
  76         INIT_LIST_HEAD(&neigh_node->list);
  77
  78         memcpy(neigh_node->addr, neigh, ETH_ALEN);
  79         neigh_node->orig_node = orig_neigh_node;
  80         neigh_node->if_incoming = if_incoming;
  81
  82         list_add_tail(&neigh_node->list, &orig_node->neigh_list);
  83         return neigh_node;
  84 }
  85
  86 static void free_orig_node(void *data, void *arg)
  87 {
  88         struct list_head *list_pos, *list_pos_tmp;
  89         struct neigh_node *neigh_node;
  90         struct orig_node *orig_node = (struct orig_node *)data;
  91         struct bat_priv *bat_priv = (struct bat_priv *)arg;
  92
  93         /* for all neighbors towards this originator ... */
  94         list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) {
  95                 neigh_node = list_entry(list_pos, struct neigh_node, list);
  96
  97                 list_del(list_pos);
  98                 kfree(neigh_node);
  99         }
 100
 101         frag_list_free(&orig_node->frag_list);
 102         hna_global_del_orig(bat_priv, orig_node, "originator timed out");
 103
 104         kfree(orig_node->bcast_own);
 105         kfree(orig_node->bcast_own_sum);
 106         kfree(orig_node);
 107 }
 108
 109 void originator_free(struct bat_priv *bat_priv)
 110 {
 111         if (!bat_priv->orig_hash)
 112                 return;
 113
 114         cancel_delayed_work_sync(&bat_priv->orig_work);
 115
 116         spin_lock_bh(&bat_priv->orig_hash_lock);
 117         hash_delete(bat_priv->orig_hash, free_orig_node, bat_priv);
 118         bat_priv->orig_hash = NULL;
 119         spin_unlock_bh(&bat_priv->orig_hash_lock);
 120 }
 121
 122 /* this function finds or creates an originator entry for the given
 123  * address if it does not exits */
 124 struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr)
 125 {
 126         struct orig_node *orig_node;
 127         int size;
 128         int hash_added;
 129
 130         orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
 131                                                    compare_orig, choose_orig,
 132                                                    addr));
 133
 134         if (orig_node)
 135                 return orig_node;
 136
 137         bat_dbg(DBG_BATMAN, bat_priv,
 138                 "Creating new originator: %pM\n", addr);
 139
 140         orig_node = kzalloc(sizeof(struct orig_node), GFP_ATOMIC);
 141         if (!orig_node)
 142                 return NULL;
 143
 144         INIT_LIST_HEAD(&orig_node->neigh_list);
 145
 146         memcpy(orig_node->orig, addr, ETH_ALEN);
 147         orig_node->router = NULL;
 148         orig_node->hna_buff = NULL;
 149         orig_node->bcast_seqno_reset = jiffies - 1
 150                                         - msecs_to_jiffies(RESET_PROTECTION_MS);
 151         orig_node->batman_seqno_reset = jiffies - 1
 152                                         - msecs_to_jiffies(RESET_PROTECTION_MS);
 153
 154         size = bat_priv->num_ifaces * sizeof(unsigned long) * NUM_WORDS;
 155
 156         orig_node->bcast_own = kzalloc(size, GFP_ATOMIC);
 157         if (!orig_node->bcast_own)
 158                 goto free_orig_node;
 159
 160         size = bat_priv->num_ifaces * sizeof(uint8_t);
 161         orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 162
 163         INIT_LIST_HEAD(&orig_node->frag_list);
 164         orig_node->last_frag_packet = 0;
 165
 166         if (!orig_node->bcast_own_sum)
 167                 goto free_bcast_own;
 168
 169         hash_added = hash_add(bat_priv->orig_hash, compare_orig, choose_orig,
 170                               orig_node);
 171         if (hash_added < 0)
 172                 goto free_bcast_own_sum;
 173
 174         return orig_node;
 175 free_bcast_own_sum:
 176         kfree(orig_node->bcast_own_sum);
 177 free_bcast_own:
 178         kfree(orig_node->bcast_own);
 179 free_orig_node:
 180         kfree(orig_node);
 181         return NULL;
 182 }
 183
 184 static bool purge_orig_neighbors(struct bat_priv *bat_priv,
 185                                  struct orig_node *orig_node,
 186                                  struct neigh_node **best_neigh_node)
 187 {
 188         struct list_head *list_pos, *list_pos_tmp;
 189         struct neigh_node *neigh_node;
 190         bool neigh_purged = false;
 191
 192         *best_neigh_node = NULL;
 193
 194         /* for all neighbors towards this originator ... */
 195         list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) {
 196                 neigh_node = list_entry(list_pos, struct neigh_node, list);
 197
 198                 if ((time_after(jiffies,
 199                         neigh_node->last_valid + PURGE_TIMEOUT * HZ)) ||
 200                     (neigh_node->if_incoming->if_status == IF_INACTIVE) ||
 201                     (neigh_node->if_incoming->if_status == IF_TO_BE_REMOVED)) {
 202
 203                         if (neigh_node->if_incoming->if_status ==
 204                                                         IF_TO_BE_REMOVED)
 205                                 bat_dbg(DBG_BATMAN, bat_priv,
 206                                         "neighbor purge: originator %pM, "
 207                                         "neighbor: %pM, iface: %s\n",
 208                                         orig_node->orig, neigh_node->addr,
 209                                         neigh_node->if_incoming->net_dev->name);
 210                         else
 211                                 bat_dbg(DBG_BATMAN, bat_priv,
 212                                         "neighbor timeout: originator %pM, "
 213                                         "neighbor: %pM, last_valid: %lu\n",
 214                                         orig_node->orig, neigh_node->addr,
 215                                         (neigh_node->last_valid / HZ));
 216
 217                         neigh_purged = true;
 218                         list_del(list_pos);
 219                         kfree(neigh_node);
 220                 } else {
 221                         if ((!*best_neigh_node) ||
 222                             (neigh_node->tq_avg > (*best_neigh_node)->tq_avg))
 223                                 *best_neigh_node = neigh_node;
 224                 }
 225         }
 226         return neigh_purged;
 227 }
 228
 229 static bool purge_orig_node(struct bat_priv *bat_priv,
 230                             struct orig_node *orig_node)
 231 {
 232         struct neigh_node *best_neigh_node;
 233
 234         if (time_after(jiffies,
 235                 orig_node->last_valid + 2 * PURGE_TIMEOUT * HZ)) {
 236
 237                 bat_dbg(DBG_BATMAN, bat_priv,
 238                         "Originator timeout: originator %pM, last_valid %lu\n",
 239                         orig_node->orig, (orig_node->last_valid / HZ));
 240                 return true;
 241         } else {
 242                 if (purge_orig_neighbors(bat_priv, orig_node,
 243                                                         &best_neigh_node)) {
 244                         update_routes(bat_priv, orig_node,
 245                                       best_neigh_node,
 246                                       orig_node->hna_buff,
 247                                       orig_node->hna_buff_len);
 248                         /* update bonding candidates, we could have lost
 249                          * some candidates. */
 250                         update_bonding_candidates(bat_priv, orig_node);
 251                 }
 252         }
 253
 254         return false;
 255 }
 256
 257 static void _purge_orig(struct bat_priv *bat_priv)
 258 {
 259         struct hashtable_t *hash = bat_priv->orig_hash;
 260         struct hlist_node *walk, *safe;
 261         struct hlist_head *head;
 262         struct element_t *bucket;
 263         struct orig_node *orig_node;
 264         int i;
 265
 266         if (!hash)
 267                 return;
 268
 269         spin_lock_bh(&bat_priv->orig_hash_lock);
 270
 271         /* for all origins... */
 272         for (i = 0; i < hash->size; i++) {
 273                 head = &hash->table[i];
 274
 275                 hlist_for_each_entry_safe(bucket, walk, safe, head, hlist) {
 276                         orig_node = bucket->data;
 277
 278                         if (purge_orig_node(bat_priv, orig_node)) {
 279                                 if (orig_node->gw_flags)
 280                                         gw_node_delete(bat_priv, orig_node);
 281                                 hlist_del(walk);
 282                                 kfree(bucket);
 283                                 free_orig_node(orig_node, bat_priv);
 284                         }
 285
 286                         if (time_after(jiffies, orig_node->last_frag_packet +
 287                                                 msecs_to_jiffies(FRAG_TIMEOUT)))
 288                                 frag_list_free(&orig_node->frag_list);
 289                 }
 290         }
 291
 292         spin_unlock_bh(&bat_priv->orig_hash_lock);
 293
 294         gw_node_purge(bat_priv);
 295         gw_election(bat_priv);
 296
 297         softif_neigh_purge(bat_priv);
 298 }
 299
 300 static void purge_orig(struct work_struct *work)
 301 {
 302         struct delayed_work *delayed_work =
 303                 container_of(work, struct delayed_work, work);
 304         struct bat_priv *bat_priv =
 305                 container_of(delayed_work, struct bat_priv, orig_work);
 306
 307         _purge_orig(bat_priv);
 308         start_purge_timer(bat_priv);
 309 }
 310
 311 void purge_orig_ref(struct bat_priv *bat_priv)
 312 {
 313         _purge_orig(bat_priv);
 314 }
 315
 316 int orig_seq_print_text(struct seq_file *seq, void *offset)
 317 {
 318         struct net_device *net_dev = (struct net_device *)seq->private;
 319         struct bat_priv *bat_priv = netdev_priv(net_dev);
 320         struct hashtable_t *hash = bat_priv->orig_hash;
 321         struct hlist_node *walk;
 322         struct hlist_head *head;
 323         struct element_t *bucket;
 324         struct orig_node *orig_node;
 325         struct neigh_node *neigh_node;
 326         int batman_count = 0;
 327         int last_seen_secs;
 328         int last_seen_msecs;
 329         int i;
 330
 331         if ((!bat_priv->primary_if) ||
 332             (bat_priv->primary_if->if_status != IF_ACTIVE)) {
 333                 if (!bat_priv->primary_if)
 334                         return seq_printf(seq, "BATMAN mesh %s disabled - "
 335                                      "please specify interfaces to enable it\n",
 336                                      net_dev->name);
 337
 338                 return seq_printf(seq, "BATMAN mesh %s "
 339                                   "disabled - primary interface not active\n",
 340                                   net_dev->name);
 341         }
 342
 343         seq_printf(seq, "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n",
 344                    SOURCE_VERSION, REVISION_VERSION_STR,
 345                    bat_priv->primary_if->net_dev->name,
 346                    bat_priv->primary_if->net_dev->dev_addr, net_dev->name);
 347         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
 348                    "Originator", "last-seen", "#", TQ_MAX_VALUE, "Nexthop",
 349                    "outgoingIF", "Potential nexthops");
 350
 351         spin_lock_bh(&bat_priv->orig_hash_lock);
 352
 353         for (i = 0; i < hash->size; i++) {
 354                 head = &hash->table[i];
 355
 356                 hlist_for_each_entry(bucket, walk, head, hlist) {
 357                         orig_node = bucket->data;
 358
 359                         if (!orig_node->router)
 360                                 continue;
 361
 362                         if (orig_node->router->tq_avg == 0)
 363                                 continue;
 364
 365                         last_seen_secs = jiffies_to_msecs(jiffies -
 366                                                 orig_node->last_valid) / 1000;
 367                         last_seen_msecs = jiffies_to_msecs(jiffies -
 368                                                 orig_node->last_valid) % 1000;
 369
 370                         neigh_node = orig_node->router;
 371                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
 372                                    orig_node->orig, last_seen_secs,
 373                                    last_seen_msecs, neigh_node->tq_avg,
 374                                    neigh_node->addr,
 375                                    neigh_node->if_incoming->net_dev->name);
 376
 377                         list_for_each_entry(neigh_node, &orig_node->neigh_list,
 378                                             list) {
 379                                 seq_printf(seq, " %pM (%3i)", neigh_node->addr,
 380                                                 neigh_node->tq_avg);
 381                         }
 382
 383                         seq_printf(seq, "\n");
 384                         batman_count++;
 385                 }
 386         }
 387
 388         spin_unlock_bh(&bat_priv->orig_hash_lock);
 389
 390         if ((batman_count == 0))
 391                 seq_printf(seq, "No batman nodes in range ...\n");
 392
 393         return 0;
 394 }
 395
 396 static int orig_node_add_if(struct orig_node *orig_node, int max_if_num)
 397 {
 398         void *data_ptr;
 399
 400         data_ptr = kmalloc(max_if_num * sizeof(unsigned long) * NUM_WORDS,
 401                            GFP_ATOMIC);
 402         if (!data_ptr) {
 403                 pr_err("Can't resize orig: out of memory\n");
 404                 return -1;
 405         }
 406
 407         memcpy(data_ptr, orig_node->bcast_own,
 408                (max_if_num - 1) * sizeof(unsigned long) * NUM_WORDS);
 409         kfree(orig_node->bcast_own);
 410         orig_node->bcast_own = data_ptr;
 411
 412         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 413         if (!data_ptr) {
 414                 pr_err("Can't resize orig: out of memory\n");
 415                 return -1;
 416         }
 417
 418         memcpy(data_ptr, orig_node->bcast_own_sum,
 419                (max_if_num - 1) * sizeof(uint8_t));
 420         kfree(orig_node->bcast_own_sum);
 421         orig_node->bcast_own_sum = data_ptr;
 422
 423         return 0;
 424 }
 425
 426 int orig_hash_add_if(struct batman_if *batman_if, int max_if_num)
 427 {
 428         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
 429         struct hashtable_t *hash = bat_priv->orig_hash;
 430         struct hlist_node *walk;
 431         struct hlist_head *head;
 432         struct element_t *bucket;
 433         struct orig_node *orig_node;
 434         int i;
 435
 436         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 437          * if_num */
 438         spin_lock_bh(&bat_priv->orig_hash_lock);
 439
 440         for (i = 0; i < hash->size; i++) {
 441                 head = &hash->table[i];
 442
 443                 hlist_for_each_entry(bucket, walk, head, hlist) {
 444                         orig_node = bucket->data;
 445
 446                         if (orig_node_add_if(orig_node, max_if_num) == -1)
 447                                 goto err;
 448                 }
 449         }
 450
 451         spin_unlock_bh(&bat_priv->orig_hash_lock);
 452         return 0;
 453
 454 err:
 455         spin_unlock_bh(&bat_priv->orig_hash_lock);
 456         return -ENOMEM;
 457 }
 458
 459 static int orig_node_del_if(struct orig_node *orig_node,
 460                      int max_if_num, int del_if_num)
 461 {
 462         void *data_ptr = NULL;
 463         int chunk_size;
 464
 465         /* last interface was removed */
 466         if (max_if_num == 0)
 467                 goto free_bcast_own;
 468
 469         chunk_size = sizeof(unsigned long) * NUM_WORDS;
 470         data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC);
 471         if (!data_ptr) {
 472                 pr_err("Can't resize orig: out of memory\n");
 473                 return -1;
 474         }
 475
 476         /* copy first part */
 477         memcpy(data_ptr, orig_node->bcast_own, del_if_num * chunk_size);
 478
 479         /* copy second part */
 480         memcpy(data_ptr + del_if_num * chunk_size,
 481                orig_node->bcast_own + ((del_if_num + 1) * chunk_size),
 482                (max_if_num - del_if_num) * chunk_size);
 483
 484 free_bcast_own:
 485         kfree(orig_node->bcast_own);
 486         orig_node->bcast_own = data_ptr;
 487
 488         if (max_if_num == 0)
 489                 goto free_own_sum;
 490
 491         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 492         if (!data_ptr) {
 493                 pr_err("Can't resize orig: out of memory\n");
 494                 return -1;
 495         }
 496
 497         memcpy(data_ptr, orig_node->bcast_own_sum,
 498                del_if_num * sizeof(uint8_t));
 499
 500         memcpy(data_ptr + del_if_num * sizeof(uint8_t),
 501                orig_node->bcast_own_sum + ((del_if_num + 1) * sizeof(uint8_t)),
 502                (max_if_num - del_if_num) * sizeof(uint8_t));
 503
 504 free_own_sum:
 505         kfree(orig_node->bcast_own_sum);
 506         orig_node->bcast_own_sum = data_ptr;
 507
 508         return 0;
 509 }
 510
 511 int orig_hash_del_if(struct batman_if *batman_if, int max_if_num)
 512 {
 513         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
 514         struct hashtable_t *hash = bat_priv->orig_hash;
 515         struct hlist_node *walk;
 516         struct hlist_head *head;
 517         struct element_t *bucket;
 518         struct batman_if *batman_if_tmp;
 519         struct orig_node *orig_node;
 520         int i, ret;
 521
 522         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 523          * if_num */
 524         spin_lock_bh(&bat_priv->orig_hash_lock);
 525
 526         for (i = 0; i < hash->size; i++) {
 527                 head = &hash->table[i];
 528
 529                 hlist_for_each_entry(bucket, walk, head, hlist) {
 530                         orig_node = bucket->data;
 531
 532                         ret = orig_node_del_if(orig_node, max_if_num,
 533                                         batman_if->if_num);
 534
 535                         if (ret == -1)
 536                                 goto err;
 537                 }
 538         }
 539
 540         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
 541         rcu_read_lock();
 542         list_for_each_entry_rcu(batman_if_tmp, &if_list, list) {
 543                 if (batman_if_tmp->if_status == IF_NOT_IN_USE)
 544                         continue;
 545
 546                 if (batman_if == batman_if_tmp)
 547                         continue;
 548
 549                 if (batman_if->soft_iface != batman_if_tmp->soft_iface)
 550                         continue;
 551
 552                 if (batman_if_tmp->if_num > batman_if->if_num)
 553                         batman_if_tmp->if_num--;
 554         }
 555         rcu_read_unlock();
 556
 557         batman_if->if_num = -1;
 558         spin_unlock_bh(&bat_priv->orig_hash_lock);
 559         return 0;
 560
 561 err:
 562         spin_unlock_bh(&bat_priv->orig_hash_lock);
 563         return -ENOMEM;
 564 }