drivers/staging/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 "hard-interface.h"
  30 #include "unicast.h"
  31
  32 static void purge_orig(struct work_struct *work);
  33
  34 static void start_purge_timer(struct bat_priv *bat_priv)
  35 {
  36         INIT_DELAYED_WORK(&bat_priv->orig_work, purge_orig);
  37         queue_delayed_work(bat_event_workqueue, &bat_priv->orig_work, 1 * HZ);
  38 }
  39
  40 int originator_init(struct bat_priv *bat_priv)
  41 {
  42         unsigned long flags;
  43         if (bat_priv->orig_hash)
  44                 return 1;
  45
  46         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
  47         bat_priv->orig_hash = hash_new(128, compare_orig, choose_orig);
  48
  49         if (!bat_priv->orig_hash)
  50                 goto err;
  51
  52         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
  53         start_purge_timer(bat_priv);
  54         return 1;
  55
  56 err:
  57         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
  58         return 0;
  59 }
  60
  61 struct neigh_node *
  62 create_neighbor(struct orig_node *orig_node, struct orig_node *orig_neigh_node,
  63                 uint8_t *neigh, struct batman_if *if_incoming)
  64 {
  65         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
  66         struct neigh_node *neigh_node;
  67
  68         bat_dbg(DBG_BATMAN, bat_priv,
  69                 "Creating new last-hop neighbor of originator\n");
  70
  71         neigh_node = kzalloc(sizeof(struct neigh_node), GFP_ATOMIC);
  72         if (!neigh_node)
  73                 return NULL;
  74
  75         INIT_LIST_HEAD(&neigh_node->list);
  76
  77         memcpy(neigh_node->addr, neigh, ETH_ALEN);
  78         neigh_node->orig_node = orig_neigh_node;
  79         neigh_node->if_incoming = if_incoming;
  80
  81         list_add_tail(&neigh_node->list, &orig_node->neigh_list);
  82         return neigh_node;
  83 }
  84
  85 static void free_orig_node(void *data, void *arg)
  86 {
  87         struct list_head *list_pos, *list_pos_tmp;
  88         struct neigh_node *neigh_node;
  89         struct orig_node *orig_node = (struct orig_node *)data;
  90         struct bat_priv *bat_priv = (struct bat_priv *)arg;
  91
  92         /* for all neighbors towards this originator ... */
  93         list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) {
  94                 neigh_node = list_entry(list_pos, struct neigh_node, list);
  95
  96                 list_del(list_pos);
  97                 kfree(neigh_node);
  98         }
  99
 100         frag_list_free(&orig_node->frag_list);
 101         hna_global_del_orig(bat_priv, orig_node, "originator timed out");
 102
 103         kfree(orig_node->bcast_own);
 104         kfree(orig_node->bcast_own_sum);
 105         kfree(orig_node);
 106 }
 107
 108 void originator_free(struct bat_priv *bat_priv)
 109 {
 110         unsigned long flags;
 111
 112         if (!bat_priv->orig_hash)
 113                 return;
 114
 115         cancel_delayed_work_sync(&bat_priv->orig_work);
 116
 117         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 118         hash_delete(bat_priv->orig_hash, free_orig_node, bat_priv);
 119         bat_priv->orig_hash = NULL;
 120         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 121 }
 122
 123 /* this function finds or creates an originator entry for the given
 124  * address if it does not exits */
 125 struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr)
 126 {
 127         struct orig_node *orig_node;
 128         struct hashtable_t *swaphash;
 129         int size;
 130
 131         orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash, addr));
 132
 133         if (orig_node)
 134                 return orig_node;
 135
 136         bat_dbg(DBG_BATMAN, bat_priv,
 137                 "Creating new originator: %pM\n", addr);
 138
 139         orig_node = kzalloc(sizeof(struct orig_node), GFP_ATOMIC);
 140         if (!orig_node)
 141                 return NULL;
 142
 143         INIT_LIST_HEAD(&orig_node->neigh_list);
 144
 145         memcpy(orig_node->orig, addr, ETH_ALEN);
 146         orig_node->router = NULL;
 147         orig_node->hna_buff = NULL;
 148         orig_node->bcast_seqno_reset = jiffies - 1
 149                                         - msecs_to_jiffies(RESET_PROTECTION_MS);
 150         orig_node->batman_seqno_reset = jiffies - 1
 151                                         - msecs_to_jiffies(RESET_PROTECTION_MS);
 152
 153         size = bat_priv->num_ifaces * sizeof(TYPE_OF_WORD) * NUM_WORDS;
 154
 155         orig_node->bcast_own = kzalloc(size, GFP_ATOMIC);
 156         if (!orig_node->bcast_own)
 157                 goto free_orig_node;
 158
 159         size = bat_priv->num_ifaces * sizeof(uint8_t);
 160         orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 161
 162         INIT_LIST_HEAD(&orig_node->frag_list);
 163         orig_node->last_frag_packet = 0;
 164
 165         if (!orig_node->bcast_own_sum)
 166                 goto free_bcast_own;
 167
 168         if (hash_add(bat_priv->orig_hash, orig_node) < 0)
 169                 goto free_bcast_own_sum;
 170
 171         if (bat_priv->orig_hash->elements * 4 > bat_priv->orig_hash->size) {
 172                 swaphash = hash_resize(bat_priv->orig_hash,
 173                                        bat_priv->orig_hash->size * 2);
 174
 175                 if (!swaphash)
 176                         bat_dbg(DBG_BATMAN, bat_priv,
 177                                 "Couldn't resize orig hash table\n");
 178                 else
 179                         bat_priv->orig_hash = swaphash;
 180         }
 181
 182         return orig_node;
 183 free_bcast_own_sum:
 184         kfree(orig_node->bcast_own_sum);
 185 free_bcast_own:
 186         kfree(orig_node->bcast_own);
 187 free_orig_node:
 188         kfree(orig_node);
 189         return NULL;
 190 }
 191
 192 static bool purge_orig_neighbors(struct bat_priv *bat_priv,
 193                                  struct orig_node *orig_node,
 194                                  struct neigh_node **best_neigh_node)
 195 {
 196         struct list_head *list_pos, *list_pos_tmp;
 197         struct neigh_node *neigh_node;
 198         bool neigh_purged = false;
 199
 200         *best_neigh_node = NULL;
 201
 202         /* for all neighbors towards this originator ... */
 203         list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) {
 204                 neigh_node = list_entry(list_pos, struct neigh_node, list);
 205
 206                 if ((time_after(jiffies,
 207                         neigh_node->last_valid + PURGE_TIMEOUT * HZ)) ||
 208                     (neigh_node->if_incoming->if_status == IF_INACTIVE) ||
 209                     (neigh_node->if_incoming->if_status == IF_TO_BE_REMOVED)) {
 210
 211                         if (neigh_node->if_incoming->if_status ==
 212                                                         IF_TO_BE_REMOVED)
 213                                 bat_dbg(DBG_BATMAN, bat_priv,
 214                                         "neighbor purge: originator %pM, "
 215                                         "neighbor: %pM, iface: %s\n",
 216                                         orig_node->orig, neigh_node->addr,
 217                                         neigh_node->if_incoming->dev);
 218                         else
 219                                 bat_dbg(DBG_BATMAN, bat_priv,
 220                                         "neighbor timeout: originator %pM, "
 221                                         "neighbor: %pM, last_valid: %lu\n",
 222                                         orig_node->orig, neigh_node->addr,
 223                                         (neigh_node->last_valid / HZ));
 224
 225                         neigh_purged = true;
 226                         list_del(list_pos);
 227                         kfree(neigh_node);
 228                 } else {
 229                         if ((*best_neigh_node == NULL) ||
 230                             (neigh_node->tq_avg > (*best_neigh_node)->tq_avg))
 231                                 *best_neigh_node = neigh_node;
 232                 }
 233         }
 234         return neigh_purged;
 235 }
 236
 237 static bool purge_orig_node(struct bat_priv *bat_priv,
 238                             struct orig_node *orig_node)
 239 {
 240         struct neigh_node *best_neigh_node;
 241
 242         if (time_after(jiffies,
 243                 orig_node->last_valid + 2 * PURGE_TIMEOUT * HZ)) {
 244
 245                 bat_dbg(DBG_BATMAN, bat_priv,
 246                         "Originator timeout: originator %pM, last_valid %lu\n",
 247                         orig_node->orig, (orig_node->last_valid / HZ));
 248                 return true;
 249         } else {
 250                 if (purge_orig_neighbors(bat_priv, orig_node,
 251                                                         &best_neigh_node)) {
 252                         update_routes(bat_priv, orig_node,
 253                                       best_neigh_node,
 254                                       orig_node->hna_buff,
 255                                       orig_node->hna_buff_len);
 256                         /* update bonding candidates, we could have lost
 257                          * some candidates. */
 258                         update_bonding_candidates(bat_priv, orig_node);
 259                 }
 260         }
 261
 262         return false;
 263 }
 264
 265 static void _purge_orig(struct bat_priv *bat_priv)
 266 {
 267         HASHIT(hashit);
 268         struct orig_node *orig_node;
 269         unsigned long flags;
 270
 271         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 272
 273         /* for all origins... */
 274         while (hash_iterate(bat_priv->orig_hash, &hashit)) {
 275                 orig_node = hashit.bucket->data;
 276
 277                 if (purge_orig_node(bat_priv, orig_node)) {
 278                         hash_remove_bucket(bat_priv->orig_hash, &hashit);
 279                         free_orig_node(orig_node, bat_priv);
 280                 }
 281
 282                 if (time_after(jiffies, (orig_node->last_frag_packet +
 283                                         msecs_to_jiffies(FRAG_TIMEOUT))))
 284                         frag_list_free(&orig_node->frag_list);
 285         }
 286
 287         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 288
 289 }
 290
 291 static void purge_orig(struct work_struct *work)
 292 {
 293         struct delayed_work *delayed_work =
 294                 container_of(work, struct delayed_work, work);
 295         struct bat_priv *bat_priv =
 296                 container_of(delayed_work, struct bat_priv, orig_work);
 297
 298         _purge_orig(bat_priv);
 299         start_purge_timer(bat_priv);
 300 }
 301
 302 void purge_orig_ref(struct bat_priv *bat_priv)
 303 {
 304         _purge_orig(bat_priv);
 305 }
 306
 307 int orig_seq_print_text(struct seq_file *seq, void *offset)
 308 {
 309         HASHIT(hashit);
 310         struct net_device *net_dev = (struct net_device *)seq->private;
 311         struct bat_priv *bat_priv = netdev_priv(net_dev);
 312         struct orig_node *orig_node;
 313         struct neigh_node *neigh_node;
 314         int batman_count = 0;
 315         int last_seen_secs;
 316         int last_seen_msecs;
 317         unsigned long flags;
 318         char orig_str[ETH_STR_LEN], router_str[ETH_STR_LEN];
 319
 320         if ((!bat_priv->primary_if) ||
 321             (bat_priv->primary_if->if_status != IF_ACTIVE)) {
 322                 if (!bat_priv->primary_if)
 323                         return seq_printf(seq, "BATMAN mesh %s disabled - "
 324                                      "please specify interfaces to enable it\n",
 325                                      net_dev->name);
 326
 327                 return seq_printf(seq, "BATMAN mesh %s "
 328                                   "disabled - primary interface not active\n",
 329                                   net_dev->name);
 330         }
 331
 332         rcu_read_lock();
 333         seq_printf(seq, "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%s (%s)]\n",
 334                    SOURCE_VERSION, REVISION_VERSION_STR,
 335                    bat_priv->primary_if->dev, bat_priv->primary_if->addr_str,
 336                    net_dev->name);
 337         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
 338                    "Originator", "last-seen", "#", TQ_MAX_VALUE, "Nexthop",
 339                    "outgoingIF", "Potential nexthops");
 340         rcu_read_unlock();
 341
 342         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 343
 344         while (hash_iterate(bat_priv->orig_hash, &hashit)) {
 345
 346                 orig_node = hashit.bucket->data;
 347
 348                 if (!orig_node->router)
 349                         continue;
 350
 351                 if (orig_node->router->tq_avg == 0)
 352                         continue;
 353
 354                 addr_to_string(orig_str, orig_node->orig);
 355                 addr_to_string(router_str, orig_node->router->addr);
 356                 last_seen_secs = jiffies_to_msecs(jiffies -
 357                                                 orig_node->last_valid) / 1000;
 358                 last_seen_msecs = jiffies_to_msecs(jiffies -
 359                                                 orig_node->last_valid) % 1000;
 360
 361                 seq_printf(seq, "%-17s %4i.%03is   (%3i) %17s [%10s]:",
 362                            orig_str, last_seen_secs, last_seen_msecs,
 363                            orig_node->router->tq_avg, router_str,
 364                            orig_node->router->if_incoming->dev);
 365
 366                 list_for_each_entry(neigh_node, &orig_node->neigh_list, list) {
 367                         addr_to_string(orig_str, neigh_node->addr);
 368                         seq_printf(seq, " %17s (%3i)", orig_str,
 369                                            neigh_node->tq_avg);
 370                 }
 371
 372                 seq_printf(seq, "\n");
 373                 batman_count++;
 374         }
 375
 376         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 377
 378         if ((batman_count == 0))
 379                 seq_printf(seq, "No batman nodes in range ...\n");
 380
 381         return 0;
 382 }
 383
 384 static int orig_node_add_if(struct orig_node *orig_node, int max_if_num)
 385 {
 386         void *data_ptr;
 387
 388         data_ptr = kmalloc(max_if_num * sizeof(TYPE_OF_WORD) * NUM_WORDS,
 389                            GFP_ATOMIC);
 390         if (!data_ptr) {
 391                 pr_err("Can't resize orig: out of memory\n");
 392                 return -1;
 393         }
 394
 395         memcpy(data_ptr, orig_node->bcast_own,
 396                (max_if_num - 1) * sizeof(TYPE_OF_WORD) * NUM_WORDS);
 397         kfree(orig_node->bcast_own);
 398         orig_node->bcast_own = data_ptr;
 399
 400         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 401         if (!data_ptr) {
 402                 pr_err("Can't resize orig: out of memory\n");
 403                 return -1;
 404         }
 405
 406         memcpy(data_ptr, orig_node->bcast_own_sum,
 407                (max_if_num - 1) * sizeof(uint8_t));
 408         kfree(orig_node->bcast_own_sum);
 409         orig_node->bcast_own_sum = data_ptr;
 410
 411         return 0;
 412 }
 413
 414 int orig_hash_add_if(struct batman_if *batman_if, int max_if_num)
 415 {
 416         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
 417         struct orig_node *orig_node;
 418         unsigned long flags;
 419         HASHIT(hashit);
 420
 421         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 422          * if_num */
 423         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 424
 425         while (hash_iterate(bat_priv->orig_hash, &hashit)) {
 426                 orig_node = hashit.bucket->data;
 427
 428                 if (orig_node_add_if(orig_node, max_if_num) == -1)
 429                         goto err;
 430         }
 431
 432         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 433         return 0;
 434
 435 err:
 436         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 437         return -ENOMEM;
 438 }
 439
 440 static int orig_node_del_if(struct orig_node *orig_node,
 441                      int max_if_num, int del_if_num)
 442 {
 443         void *data_ptr = NULL;
 444         int chunk_size;
 445
 446         /* last interface was removed */
 447         if (max_if_num == 0)
 448                 goto free_bcast_own;
 449
 450         chunk_size = sizeof(TYPE_OF_WORD) * NUM_WORDS;
 451         data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC);
 452         if (!data_ptr) {
 453                 pr_err("Can't resize orig: out of memory\n");
 454                 return -1;
 455         }
 456
 457         /* copy first part */
 458         memcpy(data_ptr, orig_node->bcast_own, del_if_num * chunk_size);
 459
 460         /* copy second part */
 461         memcpy(data_ptr,
 462                orig_node->bcast_own + ((del_if_num + 1) * chunk_size),
 463                (max_if_num - del_if_num) * chunk_size);
 464
 465 free_bcast_own:
 466         kfree(orig_node->bcast_own);
 467         orig_node->bcast_own = data_ptr;
 468
 469         if (max_if_num == 0)
 470                 goto free_own_sum;
 471
 472         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 473         if (!data_ptr) {
 474                 pr_err("Can't resize orig: out of memory\n");
 475                 return -1;
 476         }
 477
 478         memcpy(data_ptr, orig_node->bcast_own_sum,
 479                del_if_num * sizeof(uint8_t));
 480
 481         memcpy(data_ptr,
 482                orig_node->bcast_own_sum + ((del_if_num + 1) * sizeof(uint8_t)),
 483                (max_if_num - del_if_num) * sizeof(uint8_t));
 484
 485 free_own_sum:
 486         kfree(orig_node->bcast_own_sum);
 487         orig_node->bcast_own_sum = data_ptr;
 488
 489         return 0;
 490 }
 491
 492 int orig_hash_del_if(struct batman_if *batman_if, int max_if_num)
 493 {
 494         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
 495         struct batman_if *batman_if_tmp;
 496         struct orig_node *orig_node;
 497         unsigned long flags;
 498         HASHIT(hashit);
 499         int ret;
 500
 501         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 502          * if_num */
 503         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 504
 505         while (hash_iterate(bat_priv->orig_hash, &hashit)) {
 506                 orig_node = hashit.bucket->data;
 507
 508                 ret = orig_node_del_if(orig_node, max_if_num,
 509                                        batman_if->if_num);
 510
 511                 if (ret == -1)
 512                         goto err;
 513         }
 514
 515         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
 516         rcu_read_lock();
 517         list_for_each_entry_rcu(batman_if_tmp, &if_list, list) {
 518                 if (batman_if_tmp->if_status == IF_NOT_IN_USE)
 519                         continue;
 520
 521                 if (batman_if == batman_if_tmp)
 522                         continue;
 523
 524                 if (batman_if->soft_iface != batman_if_tmp->soft_iface)
 525                         continue;
 526
 527                 if (batman_if_tmp->if_num > batman_if->if_num)
 528                         batman_if_tmp->if_num--;
 529         }
 530         rcu_read_unlock();
 531
 532         batman_if->if_num = -1;
 533         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 534         return 0;
 535
 536 err:
 537         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 538         return -ENOMEM;
 539 }