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