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->net_dev->name);
 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
 319         if ((!bat_priv->primary_if) ||
 320             (bat_priv->primary_if->if_status != IF_ACTIVE)) {
 321                 if (!bat_priv->primary_if)
 322                         return seq_printf(seq, "BATMAN mesh %s disabled - "
 323                                      "please specify interfaces to enable it\n",
 324                                      net_dev->name);
 325
 326                 return seq_printf(seq, "BATMAN mesh %s "
 327                                   "disabled - primary interface not active\n",
 328                                   net_dev->name);
 329         }
 330
 331         seq_printf(seq, "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n",
 332                    SOURCE_VERSION, REVISION_VERSION_STR,
 333                    bat_priv->primary_if->net_dev->name,
 334                    bat_priv->primary_if->net_dev->dev_addr, net_dev->name);
 335         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
 336                    "Originator", "last-seen", "#", TQ_MAX_VALUE, "Nexthop",
 337                    "outgoingIF", "Potential nexthops");
 338
 339         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 340
 341         while (hash_iterate(bat_priv->orig_hash, &hashit)) {
 342
 343                 orig_node = hashit.bucket->data;
 344
 345                 if (!orig_node->router)
 346                         continue;
 347
 348                 if (orig_node->router->tq_avg == 0)
 349                         continue;
 350
 351                 last_seen_secs = jiffies_to_msecs(jiffies -
 352                                                 orig_node->last_valid) / 1000;
 353                 last_seen_msecs = jiffies_to_msecs(jiffies -
 354                                                 orig_node->last_valid) % 1000;
 355
 356                 seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
 357                            orig_node->orig, last_seen_secs, last_seen_msecs,
 358                            orig_node->router->tq_avg, orig_node->router->addr,
 359                            orig_node->router->if_incoming->net_dev->name);
 360
 361                 list_for_each_entry(neigh_node, &orig_node->neigh_list, list) {
 362                         seq_printf(seq, " %pM (%3i)", neigh_node->addr,
 363                                            neigh_node->tq_avg);
 364                 }
 365
 366                 seq_printf(seq, "\n");
 367                 batman_count++;
 368         }
 369
 370         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 371
 372         if ((batman_count == 0))
 373                 seq_printf(seq, "No batman nodes in range ...\n");
 374
 375         return 0;
 376 }
 377
 378 static int orig_node_add_if(struct orig_node *orig_node, int max_if_num)
 379 {
 380         void *data_ptr;
 381
 382         data_ptr = kmalloc(max_if_num * sizeof(TYPE_OF_WORD) * NUM_WORDS,
 383                            GFP_ATOMIC);
 384         if (!data_ptr) {
 385                 pr_err("Can't resize orig: out of memory\n");
 386                 return -1;
 387         }
 388
 389         memcpy(data_ptr, orig_node->bcast_own,
 390                (max_if_num - 1) * sizeof(TYPE_OF_WORD) * NUM_WORDS);
 391         kfree(orig_node->bcast_own);
 392         orig_node->bcast_own = data_ptr;
 393
 394         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 395         if (!data_ptr) {
 396                 pr_err("Can't resize orig: out of memory\n");
 397                 return -1;
 398         }
 399
 400         memcpy(data_ptr, orig_node->bcast_own_sum,
 401                (max_if_num - 1) * sizeof(uint8_t));
 402         kfree(orig_node->bcast_own_sum);
 403         orig_node->bcast_own_sum = data_ptr;
 404
 405         return 0;
 406 }
 407
 408 int orig_hash_add_if(struct batman_if *batman_if, int max_if_num)
 409 {
 410         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
 411         struct orig_node *orig_node;
 412         unsigned long flags;
 413         HASHIT(hashit);
 414
 415         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 416          * if_num */
 417         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 418
 419         while (hash_iterate(bat_priv->orig_hash, &hashit)) {
 420                 orig_node = hashit.bucket->data;
 421
 422                 if (orig_node_add_if(orig_node, max_if_num) == -1)
 423                         goto err;
 424         }
 425
 426         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 427         return 0;
 428
 429 err:
 430         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 431         return -ENOMEM;
 432 }
 433
 434 static int orig_node_del_if(struct orig_node *orig_node,
 435                      int max_if_num, int del_if_num)
 436 {
 437         void *data_ptr = NULL;
 438         int chunk_size;
 439
 440         /* last interface was removed */
 441         if (max_if_num == 0)
 442                 goto free_bcast_own;
 443
 444         chunk_size = sizeof(TYPE_OF_WORD) * NUM_WORDS;
 445         data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC);
 446         if (!data_ptr) {
 447                 pr_err("Can't resize orig: out of memory\n");
 448                 return -1;
 449         }
 450
 451         /* copy first part */
 452         memcpy(data_ptr, orig_node->bcast_own, del_if_num * chunk_size);
 453
 454         /* copy second part */
 455         memcpy(data_ptr + del_if_num * chunk_size,
 456                orig_node->bcast_own + ((del_if_num + 1) * chunk_size),
 457                (max_if_num - del_if_num) * chunk_size);
 458
 459 free_bcast_own:
 460         kfree(orig_node->bcast_own);
 461         orig_node->bcast_own = data_ptr;
 462
 463         if (max_if_num == 0)
 464                 goto free_own_sum;
 465
 466         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 467         if (!data_ptr) {
 468                 pr_err("Can't resize orig: out of memory\n");
 469                 return -1;
 470         }
 471
 472         memcpy(data_ptr, orig_node->bcast_own_sum,
 473                del_if_num * sizeof(uint8_t));
 474
 475         memcpy(data_ptr + del_if_num * sizeof(uint8_t),
 476                orig_node->bcast_own_sum + ((del_if_num + 1) * sizeof(uint8_t)),
 477                (max_if_num - del_if_num) * sizeof(uint8_t));
 478
 479 free_own_sum:
 480         kfree(orig_node->bcast_own_sum);
 481         orig_node->bcast_own_sum = data_ptr;
 482
 483         return 0;
 484 }
 485
 486 int orig_hash_del_if(struct batman_if *batman_if, int max_if_num)
 487 {
 488         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
 489         struct batman_if *batman_if_tmp;
 490         struct orig_node *orig_node;
 491         unsigned long flags;
 492         HASHIT(hashit);
 493         int ret;
 494
 495         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 496          * if_num */
 497         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 498
 499         while (hash_iterate(bat_priv->orig_hash, &hashit)) {
 500                 orig_node = hashit.bucket->data;
 501
 502                 ret = orig_node_del_if(orig_node, max_if_num,
 503                                        batman_if->if_num);
 504
 505                 if (ret == -1)
 506                         goto err;
 507         }
 508
 509         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
 510         rcu_read_lock();
 511         list_for_each_entry_rcu(batman_if_tmp, &if_list, list) {
 512                 if (batman_if_tmp->if_status == IF_NOT_IN_USE)
 513                         continue;
 514
 515                 if (batman_if == batman_if_tmp)
 516                         continue;
 517
 518                 if (batman_if->soft_iface != batman_if_tmp->soft_iface)
 519                         continue;
 520
 521                 if (batman_if_tmp->if_num > batman_if->if_num)
 522                         batman_if_tmp->if_num--;
 523         }
 524         rcu_read_unlock();
 525
 526         batman_if->if_num = -1;
 527         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 528         return 0;
 529
 530 err:
 531         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 532         return -ENOMEM;
 533 }