release/src-rt-6.x.4708/linux/linux-2.6.36/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
  31 static DECLARE_DELAYED_WORK(purge_orig_wq, purge_orig);
  32
  33 static void start_purge_timer(void)
  34 {
  35         queue_delayed_work(bat_event_workqueue, &purge_orig_wq, 1 * HZ);
  36 }
  37
  38 int originator_init(void)
  39 {
  40         unsigned long flags;
  41         if (orig_hash)
  42                 return 1;
  43
  44         spin_lock_irqsave(&orig_hash_lock, flags);
  45         orig_hash = hash_new(128, compare_orig, choose_orig);
  46
  47         if (!orig_hash)
  48                 goto err;
  49
  50         spin_unlock_irqrestore(&orig_hash_lock, flags);
  51         start_purge_timer();
  52         return 1;
  53
  54 err:
  55         spin_unlock_irqrestore(&orig_hash_lock, flags);
  56         return 0;
  57 }
  58
  59 struct neigh_node *
  60 create_neighbor(struct orig_node *orig_node, struct orig_node *orig_neigh_node,
  61                 uint8_t *neigh, struct batman_if *if_incoming)
  62 {
  63         struct bat_priv *bat_priv = netdev_priv(soft_device);
  64         struct neigh_node *neigh_node;
  65
  66         bat_dbg(DBG_BATMAN, bat_priv,
  67                 "Creating new last-hop neighbor of originator\n");
  68
  69         neigh_node = kzalloc(sizeof(struct neigh_node), GFP_ATOMIC);
  70         if (!neigh_node)
  71                 return NULL;
  72
  73         INIT_LIST_HEAD(&neigh_node->list);
  74
  75         memcpy(neigh_node->addr, neigh, ETH_ALEN);
  76         neigh_node->orig_node = orig_neigh_node;
  77         neigh_node->if_incoming = if_incoming;
  78
  79         list_add_tail(&neigh_node->list, &orig_node->neigh_list);
  80         return neigh_node;
  81 }
  82
  83 static void free_orig_node(void *data)
  84 {
  85         struct list_head *list_pos, *list_pos_tmp;
  86         struct neigh_node *neigh_node;
  87         struct orig_node *orig_node = (struct orig_node *)data;
  88
  89         /* for all neighbors towards this originator ... */
  90         list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) {
  91                 neigh_node = list_entry(list_pos, struct neigh_node, list);
  92
  93                 list_del(list_pos);
  94                 kfree(neigh_node);
  95         }
  96
  97         hna_global_del_orig(orig_node, "originator timed out");
  98
  99         kfree(orig_node->bcast_own);
 100         kfree(orig_node->bcast_own_sum);
 101         kfree(orig_node);
 102 }
 103
 104 void originator_free(void)
 105 {
 106         unsigned long flags;
 107
 108         if (!orig_hash)
 109                 return;
 110
 111         cancel_delayed_work_sync(&purge_orig_wq);
 112
 113         spin_lock_irqsave(&orig_hash_lock, flags);
 114         hash_delete(orig_hash, free_orig_node);
 115         orig_hash = NULL;
 116         spin_unlock_irqrestore(&orig_hash_lock, flags);
 117 }
 118
 119 /* this function finds or creates an originator entry for the given
 120  * address if it does not exits */
 121 struct orig_node *get_orig_node(uint8_t *addr)
 122 {
 123         struct bat_priv *bat_priv = netdev_priv(soft_device);
 124         struct orig_node *orig_node;
 125         struct hashtable_t *swaphash;
 126         int size;
 127
 128         orig_node = ((struct orig_node *)hash_find(orig_hash, addr));
 129
 130         if (orig_node != NULL)
 131                 return orig_node;
 132
 133         bat_dbg(DBG_BATMAN, bat_priv,
 134                 "Creating new originator: %pM\n", addr);
 135
 136         orig_node = kzalloc(sizeof(struct orig_node), GFP_ATOMIC);
 137         if (!orig_node)
 138                 return NULL;
 139
 140         INIT_LIST_HEAD(&orig_node->neigh_list);
 141
 142         memcpy(orig_node->orig, addr, ETH_ALEN);
 143         orig_node->router = NULL;
 144         orig_node->hna_buff = NULL;
 145         orig_node->bcast_seqno_reset = jiffies - 1
 146                                         - msecs_to_jiffies(RESET_PROTECTION_MS);
 147         orig_node->batman_seqno_reset = jiffies - 1
 148                                         - msecs_to_jiffies(RESET_PROTECTION_MS);
 149
 150         size = bat_priv->num_ifaces * sizeof(TYPE_OF_WORD) * NUM_WORDS;
 151
 152         orig_node->bcast_own = kzalloc(size, GFP_ATOMIC);
 153         if (!orig_node->bcast_own)
 154                 goto free_orig_node;
 155
 156         size = bat_priv->num_ifaces * sizeof(uint8_t);
 157         orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 158         if (!orig_node->bcast_own_sum)
 159                 goto free_bcast_own;
 160
 161         if (hash_add(orig_hash, orig_node) < 0)
 162                 goto free_bcast_own_sum;
 163
 164         if (orig_hash->elements * 4 > orig_hash->size) {
 165                 swaphash = hash_resize(orig_hash, orig_hash->size * 2);
 166
 167                 if (swaphash == NULL)
 168                         bat_err(soft_device,
 169                                 "Couldn't resize orig hash table\n");
 170                 else
 171                         orig_hash = swaphash;
 172         }
 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 orig_node *orig_node,
 185                                  struct neigh_node **best_neigh_node)
 186 {
 187         struct bat_priv *bat_priv = netdev_priv(soft_device);
 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 ==
 201                                                 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->dev);
 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 == NULL) ||
 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 orig_node *orig_node)
 230 {
 231         struct bat_priv *bat_priv = netdev_priv(soft_device);
 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(orig_node, &best_neigh_node)) {
 243                         update_routes(orig_node, best_neigh_node,
 244                                       orig_node->hna_buff,
 245                                       orig_node->hna_buff_len);
 246                         /* update bonding candidates, we could have lost
 247                          * some candidates. */
 248                         update_bonding_candidates(bat_priv, orig_node);
 249                 }
 250         }
 251
 252         return false;
 253 }
 254
 255 void purge_orig(struct work_struct *work)
 256 {
 257         HASHIT(hashit);
 258         struct orig_node *orig_node;
 259         unsigned long flags;
 260
 261         spin_lock_irqsave(&orig_hash_lock, flags);
 262
 263         /* for all origins... */
 264         while (hash_iterate(orig_hash, &hashit)) {
 265                 orig_node = hashit.bucket->data;
 266                 if (purge_orig_node(orig_node)) {
 267                         hash_remove_bucket(orig_hash, &hashit);
 268                         free_orig_node(orig_node);
 269                 }
 270         }
 271
 272         spin_unlock_irqrestore(&orig_hash_lock, flags);
 273
 274         /* if work == NULL we were not called by the timer
 275          * and thus do not need to re-arm the timer */
 276         if (work)
 277                 start_purge_timer();
 278 }
 279
 280 int orig_seq_print_text(struct seq_file *seq, void *offset)
 281 {
 282         HASHIT(hashit);
 283         struct net_device *net_dev = (struct net_device *)seq->private;
 284         struct bat_priv *bat_priv = netdev_priv(net_dev);
 285         struct orig_node *orig_node;
 286         struct neigh_node *neigh_node;
 287         int batman_count = 0;
 288         int last_seen_secs;
 289         int last_seen_msecs;
 290         unsigned long flags;
 291         char orig_str[ETH_STR_LEN], router_str[ETH_STR_LEN];
 292
 293         if ((!bat_priv->primary_if) ||
 294             (bat_priv->primary_if->if_status != IF_ACTIVE)) {
 295                 if (!bat_priv->primary_if)
 296                         return seq_printf(seq, "BATMAN mesh %s disabled - "
 297                                      "please specify interfaces to enable it\n",
 298                                      net_dev->name);
 299
 300                 return seq_printf(seq, "BATMAN mesh %s "
 301                                   "disabled - primary interface not active\n",
 302                                   net_dev->name);
 303         }
 304
 305         rcu_read_lock();
 306         seq_printf(seq, "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%s (%s)]\n",
 307                    SOURCE_VERSION, REVISION_VERSION_STR,
 308                    bat_priv->primary_if->dev, bat_priv->primary_if->addr_str,
 309                    net_dev->name);
 310         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
 311                    "Originator", "last-seen", "#", TQ_MAX_VALUE, "Nexthop",
 312                    "outgoingIF", "Potential nexthops");
 313         rcu_read_unlock();
 314
 315         spin_lock_irqsave(&orig_hash_lock, flags);
 316
 317         while (hash_iterate(orig_hash, &hashit)) {
 318
 319                 orig_node = hashit.bucket->data;
 320
 321                 if (!orig_node->router)
 322                         continue;
 323
 324                 if (orig_node->router->tq_avg == 0)
 325                         continue;
 326
 327                 addr_to_string(orig_str, orig_node->orig);
 328                 addr_to_string(router_str, orig_node->router->addr);
 329                 last_seen_secs = jiffies_to_msecs(jiffies -
 330                                                 orig_node->last_valid) / 1000;
 331                 last_seen_msecs = jiffies_to_msecs(jiffies -
 332                                                 orig_node->last_valid) % 1000;
 333
 334                 seq_printf(seq, "%-17s %4i.%03is   (%3i) %17s [%10s]:",
 335                            orig_str, last_seen_secs, last_seen_msecs,
 336                            orig_node->router->tq_avg, router_str,
 337                            orig_node->router->if_incoming->dev);
 338
 339                 list_for_each_entry(neigh_node, &orig_node->neigh_list, list) {
 340                         addr_to_string(orig_str, neigh_node->addr);
 341                         seq_printf(seq, " %17s (%3i)", orig_str,
 342                                            neigh_node->tq_avg);
 343                 }
 344
 345                 seq_printf(seq, "\n");
 346                 batman_count++;
 347         }
 348
 349         spin_unlock_irqrestore(&orig_hash_lock, flags);
 350
 351         if ((batman_count == 0))
 352                 seq_printf(seq, "No batman nodes in range ...\n");
 353
 354         return 0;
 355 }
 356
 357 static int orig_node_add_if(struct orig_node *orig_node, int max_if_num)
 358 {
 359         void *data_ptr;
 360
 361         data_ptr = kmalloc(max_if_num * sizeof(TYPE_OF_WORD) * NUM_WORDS,
 362                            GFP_ATOMIC);
 363         if (!data_ptr) {
 364                 pr_err("Can't resize orig: out of memory\n");
 365                 return -1;
 366         }
 367
 368         memcpy(data_ptr, orig_node->bcast_own,
 369                (max_if_num - 1) * sizeof(TYPE_OF_WORD) * NUM_WORDS);
 370         kfree(orig_node->bcast_own);
 371         orig_node->bcast_own = data_ptr;
 372
 373         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 374         if (!data_ptr) {
 375                 pr_err("Can't resize orig: out of memory\n");
 376                 return -1;
 377         }
 378
 379         memcpy(data_ptr, orig_node->bcast_own_sum,
 380                (max_if_num - 1) * sizeof(uint8_t));
 381         kfree(orig_node->bcast_own_sum);
 382         orig_node->bcast_own_sum = data_ptr;
 383
 384         return 0;
 385 }
 386
 387 int orig_hash_add_if(struct batman_if *batman_if, int max_if_num)
 388 {
 389         struct orig_node *orig_node;
 390         unsigned long flags;
 391         HASHIT(hashit);
 392
 393         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 394          * if_num */
 395         spin_lock_irqsave(&orig_hash_lock, flags);
 396
 397         while (hash_iterate(orig_hash, &hashit)) {
 398                 orig_node = hashit.bucket->data;
 399
 400                 if (orig_node_add_if(orig_node, max_if_num) == -1)
 401                         goto err;
 402         }
 403
 404         spin_unlock_irqrestore(&orig_hash_lock, flags);
 405         return 0;
 406
 407 err:
 408         spin_unlock_irqrestore(&orig_hash_lock, flags);
 409         return -ENOMEM;
 410 }
 411
 412 static int orig_node_del_if(struct orig_node *orig_node,
 413                      int max_if_num, int del_if_num)
 414 {
 415         void *data_ptr = NULL;
 416         int chunk_size;
 417
 418         /* last interface was removed */
 419         if (max_if_num == 0)
 420                 goto free_bcast_own;
 421
 422         chunk_size = sizeof(TYPE_OF_WORD) * NUM_WORDS;
 423         data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC);
 424         if (!data_ptr) {
 425                 pr_err("Can't resize orig: out of memory\n");
 426                 return -1;
 427         }
 428
 429         /* copy first part */
 430         memcpy(data_ptr, orig_node->bcast_own, del_if_num * chunk_size);
 431
 432         /* copy second part */
 433         memcpy(data_ptr,
 434                orig_node->bcast_own + ((del_if_num + 1) * chunk_size),
 435                (max_if_num - del_if_num) * chunk_size);
 436
 437 free_bcast_own:
 438         kfree(orig_node->bcast_own);
 439         orig_node->bcast_own = data_ptr;
 440
 441         if (max_if_num == 0)
 442                 goto free_own_sum;
 443
 444         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 445         if (!data_ptr) {
 446                 pr_err("Can't resize orig: out of memory\n");
 447                 return -1;
 448         }
 449
 450         memcpy(data_ptr, orig_node->bcast_own_sum,
 451                del_if_num * sizeof(uint8_t));
 452
 453         memcpy(data_ptr,
 454                orig_node->bcast_own_sum + ((del_if_num + 1) * sizeof(uint8_t)),
 455                (max_if_num - del_if_num) * sizeof(uint8_t));
 456
 457 free_own_sum:
 458         kfree(orig_node->bcast_own_sum);
 459         orig_node->bcast_own_sum = data_ptr;
 460
 461         return 0;
 462 }
 463
 464 int orig_hash_del_if(struct batman_if *batman_if, int max_if_num)
 465 {
 466         struct batman_if *batman_if_tmp;
 467         struct orig_node *orig_node;
 468         unsigned long flags;
 469         HASHIT(hashit);
 470         int ret;
 471
 472         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 473          * if_num */
 474         spin_lock_irqsave(&orig_hash_lock, flags);
 475
 476         while (hash_iterate(orig_hash, &hashit)) {
 477                 orig_node = hashit.bucket->data;
 478
 479                 ret = orig_node_del_if(orig_node, max_if_num,
 480                                        batman_if->if_num);
 481
 482                 if (ret == -1)
 483                         goto err;
 484         }
 485
 486         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
 487         rcu_read_lock();
 488         list_for_each_entry_rcu(batman_if_tmp, &if_list, list) {
 489                 if (batman_if_tmp->if_status == IF_NOT_IN_USE)
 490                         continue;
 491
 492                 if (batman_if == batman_if_tmp)
 493                         continue;
 494
 495                 if (batman_if_tmp->if_num > batman_if->if_num)
 496                         batman_if_tmp->if_num--;
 497         }
 498         rcu_read_unlock();
 499
 500         batman_if->if_num = -1;
 501         spin_unlock_irqrestore(&orig_hash_lock, flags);
 502         return 0;
 503
 504 err:
 505         spin_unlock_irqrestore(&orig_hash_lock, flags);
 506         return -ENOMEM;
 507 }