net/batman-adv/translation-table.c

   1 /*
   2  * Copyright (C) 2007-2010 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 #include "main.h"
  23 #include "translation-table.h"
  24 #include "soft-interface.h"
  25 #include "types.h"
  26 #include "hash.h"
  27 #include "originator.h"
  28
  29 static void hna_local_purge(struct work_struct *work);
  30 static void _hna_global_del_orig(struct bat_priv *bat_priv,
  31                                  struct hna_global_entry *hna_global_entry,
  32                                  char *message);
  33
  34 static void hna_local_start_timer(struct bat_priv *bat_priv)
  35 {
  36         INIT_DELAYED_WORK(&bat_priv->hna_work, hna_local_purge);
  37         queue_delayed_work(bat_event_workqueue, &bat_priv->hna_work, 10 * HZ);
  38 }
  39
  40 int hna_local_init(struct bat_priv *bat_priv)
  41 {
  42         if (bat_priv->hna_local_hash)
  43                 return 1;
  44
  45         bat_priv->hna_local_hash = hash_new(1024);
  46
  47         if (!bat_priv->hna_local_hash)
  48                 return 0;
  49
  50         atomic_set(&bat_priv->hna_local_changed, 0);
  51         hna_local_start_timer(bat_priv);
  52
  53         return 1;
  54 }
  55
  56 void hna_local_add(struct net_device *soft_iface, uint8_t *addr)
  57 {
  58         struct bat_priv *bat_priv = netdev_priv(soft_iface);
  59         struct hna_local_entry *hna_local_entry;
  60         struct hna_global_entry *hna_global_entry;
  61         int required_bytes;
  62
  63         spin_lock_bh(&bat_priv->hna_lhash_lock);
  64         hna_local_entry =
  65                 ((struct hna_local_entry *)hash_find(bat_priv->hna_local_hash,
  66                                                      compare_orig, choose_orig,
  67                                                      addr));
  68         spin_unlock_bh(&bat_priv->hna_lhash_lock);
  69
  70         if (hna_local_entry) {
  71                 hna_local_entry->last_seen = jiffies;
  72                 return;
  73         }
  74
  75         /* only announce as many hosts as possible in the batman-packet and
  76            space in batman_packet->num_hna That also should give a limit to
  77            MAC-flooding. */
  78         required_bytes = (bat_priv->num_local_hna + 1) * ETH_ALEN;
  79         required_bytes += BAT_PACKET_LEN;
  80
  81         if ((required_bytes > ETH_DATA_LEN) ||
  82             (atomic_read(&bat_priv->aggregated_ogms) &&
  83              required_bytes > MAX_AGGREGATION_BYTES) ||
  84             (bat_priv->num_local_hna + 1 > 255)) {
  85                 bat_dbg(DBG_ROUTES, bat_priv,
  86                         "Can't add new local hna entry (%pM): "
  87                         "number of local hna entries exceeds packet size\n",
  88                         addr);
  89                 return;
  90         }
  91
  92         bat_dbg(DBG_ROUTES, bat_priv,
  93                 "Creating new local hna entry: %pM\n", addr);
  94
  95         hna_local_entry = kmalloc(sizeof(struct hna_local_entry), GFP_ATOMIC);
  96         if (!hna_local_entry)
  97                 return;
  98
  99         memcpy(hna_local_entry->addr, addr, ETH_ALEN);
 100         hna_local_entry->last_seen = jiffies;
 101
 102         /* the batman interface mac address should never be purged */
 103         if (compare_orig(addr, soft_iface->dev_addr))
 104                 hna_local_entry->never_purge = 1;
 105         else
 106                 hna_local_entry->never_purge = 0;
 107
 108         spin_lock_bh(&bat_priv->hna_lhash_lock);
 109
 110         hash_add(bat_priv->hna_local_hash, compare_orig, choose_orig,
 111                  hna_local_entry);
 112         bat_priv->num_local_hna++;
 113         atomic_set(&bat_priv->hna_local_changed, 1);
 114
 115         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 116
 117         /* remove address from global hash if present */
 118         spin_lock_bh(&bat_priv->hna_ghash_lock);
 119
 120         hna_global_entry = ((struct hna_global_entry *)
 121                                 hash_find(bat_priv->hna_global_hash,
 122                                           compare_orig, choose_orig, addr));
 123
 124         if (hna_global_entry)
 125                 _hna_global_del_orig(bat_priv, hna_global_entry,
 126                                      "local hna received");
 127
 128         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 129 }
 130
 131 int hna_local_fill_buffer(struct bat_priv *bat_priv,
 132                           unsigned char *buff, int buff_len)
 133 {
 134         struct hashtable_t *hash = bat_priv->hna_local_hash;
 135         struct hna_local_entry *hna_local_entry;
 136         struct element_t *bucket;
 137         int i;
 138         struct hlist_node *walk;
 139         struct hlist_head *head;
 140         int count = 0;
 141
 142         spin_lock_bh(&bat_priv->hna_lhash_lock);
 143
 144         for (i = 0; i < hash->size; i++) {
 145                 head = &hash->table[i];
 146
 147                 hlist_for_each_entry(bucket, walk, head, hlist) {
 148
 149                         if (buff_len < (count + 1) * ETH_ALEN)
 150                                 break;
 151
 152                         hna_local_entry = bucket->data;
 153                         memcpy(buff + (count * ETH_ALEN), hna_local_entry->addr,
 154                                ETH_ALEN);
 155
 156                         count++;
 157                 }
 158         }
 159
 160         /* if we did not get all new local hnas see you next time  ;-) */
 161         if (count == bat_priv->num_local_hna)
 162                 atomic_set(&bat_priv->hna_local_changed, 0);
 163
 164         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 165         return count;
 166 }
 167
 168 int hna_local_seq_print_text(struct seq_file *seq, void *offset)
 169 {
 170         struct net_device *net_dev = (struct net_device *)seq->private;
 171         struct bat_priv *bat_priv = netdev_priv(net_dev);
 172         struct hashtable_t *hash = bat_priv->hna_local_hash;
 173         struct hna_local_entry *hna_local_entry;
 174         int i;
 175         struct hlist_node *walk;
 176         struct hlist_head *head;
 177         struct element_t *bucket;
 178         size_t buf_size, pos;
 179         char *buff;
 180
 181         if (!bat_priv->primary_if) {
 182                 return seq_printf(seq, "BATMAN mesh %s disabled - "
 183                                "please specify interfaces to enable it\n",
 184                                net_dev->name);
 185         }
 186
 187         seq_printf(seq, "Locally retrieved addresses (from %s) "
 188                    "announced via HNA:\n",
 189                    net_dev->name);
 190
 191         spin_lock_bh(&bat_priv->hna_lhash_lock);
 192
 193         buf_size = 1;
 194         /* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
 195         for (i = 0; i < hash->size; i++) {
 196                 head = &hash->table[i];
 197
 198                 hlist_for_each(walk, head)
 199                         buf_size += 21;
 200         }
 201
 202         buff = kmalloc(buf_size, GFP_ATOMIC);
 203         if (!buff) {
 204                 spin_unlock_bh(&bat_priv->hna_lhash_lock);
 205                 return -ENOMEM;
 206         }
 207         buff[0] = '\0';
 208         pos = 0;
 209
 210         for (i = 0; i < hash->size; i++) {
 211                 head = &hash->table[i];
 212
 213                 hlist_for_each_entry(bucket, walk, head, hlist) {
 214                         hna_local_entry = bucket->data;
 215
 216                         pos += snprintf(buff + pos, 22, " * %pM\n",
 217                                         hna_local_entry->addr);
 218                 }
 219         }
 220
 221         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 222
 223         seq_printf(seq, "%s", buff);
 224         kfree(buff);
 225         return 0;
 226 }
 227
 228 static void _hna_local_del(void *data, void *arg)
 229 {
 230         struct bat_priv *bat_priv = (struct bat_priv *)arg;
 231
 232         kfree(data);
 233         bat_priv->num_local_hna--;
 234         atomic_set(&bat_priv->hna_local_changed, 1);
 235 }
 236
 237 static void hna_local_del(struct bat_priv *bat_priv,
 238                           struct hna_local_entry *hna_local_entry,
 239                           char *message)
 240 {
 241         bat_dbg(DBG_ROUTES, bat_priv, "Deleting local hna entry (%pM): %s\n",
 242                 hna_local_entry->addr, message);
 243
 244         hash_remove(bat_priv->hna_local_hash, compare_orig, choose_orig,
 245                     hna_local_entry->addr);
 246         _hna_local_del(hna_local_entry, bat_priv);
 247 }
 248
 249 void hna_local_remove(struct bat_priv *bat_priv,
 250                       uint8_t *addr, char *message)
 251 {
 252         struct hna_local_entry *hna_local_entry;
 253
 254         spin_lock_bh(&bat_priv->hna_lhash_lock);
 255
 256         hna_local_entry = (struct hna_local_entry *)
 257                 hash_find(bat_priv->hna_local_hash, compare_orig, choose_orig,
 258                           addr);
 259
 260         if (hna_local_entry)
 261                 hna_local_del(bat_priv, hna_local_entry, message);
 262
 263         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 264 }
 265
 266 static void hna_local_purge(struct work_struct *work)
 267 {
 268         struct delayed_work *delayed_work =
 269                 container_of(work, struct delayed_work, work);
 270         struct bat_priv *bat_priv =
 271                 container_of(delayed_work, struct bat_priv, hna_work);
 272         struct hashtable_t *hash = bat_priv->hna_local_hash;
 273         struct hna_local_entry *hna_local_entry;
 274         int i;
 275         struct hlist_node *walk, *safe;
 276         struct hlist_head *head;
 277         struct element_t *bucket;
 278         unsigned long timeout;
 279
 280         spin_lock_bh(&bat_priv->hna_lhash_lock);
 281
 282         for (i = 0; i < hash->size; i++) {
 283                 head = &hash->table[i];
 284
 285                 hlist_for_each_entry_safe(bucket, walk, safe, head, hlist) {
 286                         hna_local_entry = bucket->data;
 287
 288                         timeout = hna_local_entry->last_seen;
 289                         timeout += LOCAL_HNA_TIMEOUT * HZ;
 290
 291                         if ((!hna_local_entry->never_purge) &&
 292                             time_after(jiffies, timeout))
 293                                 hna_local_del(bat_priv, hna_local_entry,
 294                                         "address timed out");
 295                 }
 296         }
 297
 298         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 299         hna_local_start_timer(bat_priv);
 300 }
 301
 302 void hna_local_free(struct bat_priv *bat_priv)
 303 {
 304         if (!bat_priv->hna_local_hash)
 305                 return;
 306
 307         cancel_delayed_work_sync(&bat_priv->hna_work);
 308         hash_delete(bat_priv->hna_local_hash, _hna_local_del, bat_priv);
 309         bat_priv->hna_local_hash = NULL;
 310 }
 311
 312 int hna_global_init(struct bat_priv *bat_priv)
 313 {
 314         if (bat_priv->hna_global_hash)
 315                 return 1;
 316
 317         bat_priv->hna_global_hash = hash_new(1024);
 318
 319         if (!bat_priv->hna_global_hash)
 320                 return 0;
 321
 322         return 1;
 323 }
 324
 325 void hna_global_add_orig(struct bat_priv *bat_priv,
 326                          struct orig_node *orig_node,
 327                          unsigned char *hna_buff, int hna_buff_len)
 328 {
 329         struct hna_global_entry *hna_global_entry;
 330         struct hna_local_entry *hna_local_entry;
 331         int hna_buff_count = 0;
 332         unsigned char *hna_ptr;
 333
 334         while ((hna_buff_count + 1) * ETH_ALEN <= hna_buff_len) {
 335                 spin_lock_bh(&bat_priv->hna_ghash_lock);
 336
 337                 hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
 338                 hna_global_entry = (struct hna_global_entry *)
 339                         hash_find(bat_priv->hna_global_hash, compare_orig,
 340                                   choose_orig, hna_ptr);
 341
 342                 if (!hna_global_entry) {
 343                         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 344
 345                         hna_global_entry =
 346                                 kmalloc(sizeof(struct hna_global_entry),
 347                                         GFP_ATOMIC);
 348
 349                         if (!hna_global_entry)
 350                                 break;
 351
 352                         memcpy(hna_global_entry->addr, hna_ptr, ETH_ALEN);
 353
 354                         bat_dbg(DBG_ROUTES, bat_priv,
 355                                 "Creating new global hna entry: "
 356                                 "%pM (via %pM)\n",
 357                                 hna_global_entry->addr, orig_node->orig);
 358
 359                         spin_lock_bh(&bat_priv->hna_ghash_lock);
 360                         hash_add(bat_priv->hna_global_hash, compare_orig,
 361                                  choose_orig, hna_global_entry);
 362
 363                 }
 364
 365                 hna_global_entry->orig_node = orig_node;
 366                 spin_unlock_bh(&bat_priv->hna_ghash_lock);
 367
 368                 /* remove address from local hash if present */
 369                 spin_lock_bh(&bat_priv->hna_lhash_lock);
 370
 371                 hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
 372                 hna_local_entry = (struct hna_local_entry *)
 373                         hash_find(bat_priv->hna_local_hash, compare_orig,
 374                                   choose_orig, hna_ptr);
 375
 376                 if (hna_local_entry)
 377                         hna_local_del(bat_priv, hna_local_entry,
 378                                       "global hna received");
 379
 380                 spin_unlock_bh(&bat_priv->hna_lhash_lock);
 381
 382                 hna_buff_count++;
 383         }
 384
 385         /* initialize, and overwrite if malloc succeeds */
 386         orig_node->hna_buff = NULL;
 387         orig_node->hna_buff_len = 0;
 388
 389         if (hna_buff_len > 0) {
 390                 orig_node->hna_buff = kmalloc(hna_buff_len, GFP_ATOMIC);
 391                 if (orig_node->hna_buff) {
 392                         memcpy(orig_node->hna_buff, hna_buff, hna_buff_len);
 393                         orig_node->hna_buff_len = hna_buff_len;
 394                 }
 395         }
 396 }
 397
 398 int hna_global_seq_print_text(struct seq_file *seq, void *offset)
 399 {
 400         struct net_device *net_dev = (struct net_device *)seq->private;
 401         struct bat_priv *bat_priv = netdev_priv(net_dev);
 402         struct hashtable_t *hash = bat_priv->hna_global_hash;
 403         struct hna_global_entry *hna_global_entry;
 404         int i;
 405         struct hlist_node *walk;
 406         struct hlist_head *head;
 407         struct element_t *bucket;
 408         size_t buf_size, pos;
 409         char *buff;
 410
 411         if (!bat_priv->primary_if) {
 412                 return seq_printf(seq, "BATMAN mesh %s disabled - "
 413                                   "please specify interfaces to enable it\n",
 414                                   net_dev->name);
 415         }
 416
 417         seq_printf(seq, "Globally announced HNAs received via the mesh %s\n",
 418                    net_dev->name);
 419
 420         spin_lock_bh(&bat_priv->hna_ghash_lock);
 421
 422         buf_size = 1;
 423         /* Estimate length for: " * xx:xx:xx:xx:xx:xx via xx:xx:xx:xx:xx:xx\n"*/
 424         for (i = 0; i < hash->size; i++) {
 425                 head = &hash->table[i];
 426
 427                 hlist_for_each(walk, head)
 428                         buf_size += 43;
 429         }
 430
 431         buff = kmalloc(buf_size, GFP_ATOMIC);
 432         if (!buff) {
 433                 spin_unlock_bh(&bat_priv->hna_ghash_lock);
 434                 return -ENOMEM;
 435         }
 436         buff[0] = '\0';
 437         pos = 0;
 438
 439         for (i = 0; i < hash->size; i++) {
 440                 head = &hash->table[i];
 441
 442                 hlist_for_each_entry(bucket, walk, head, hlist) {
 443                         hna_global_entry = bucket->data;
 444
 445                         pos += snprintf(buff + pos, 44,
 446                                         " * %pM via %pM\n",
 447                                         hna_global_entry->addr,
 448                                         hna_global_entry->orig_node->orig);
 449                 }
 450         }
 451
 452         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 453
 454         seq_printf(seq, "%s", buff);
 455         kfree(buff);
 456         return 0;
 457 }
 458
 459 static void _hna_global_del_orig(struct bat_priv *bat_priv,
 460                                  struct hna_global_entry *hna_global_entry,
 461                                  char *message)
 462 {
 463         bat_dbg(DBG_ROUTES, bat_priv,
 464                 "Deleting global hna entry %pM (via %pM): %s\n",
 465                 hna_global_entry->addr, hna_global_entry->orig_node->orig,
 466                 message);
 467
 468         hash_remove(bat_priv->hna_global_hash, compare_orig, choose_orig,
 469                     hna_global_entry->addr);
 470         kfree(hna_global_entry);
 471 }
 472
 473 void hna_global_del_orig(struct bat_priv *bat_priv,
 474                          struct orig_node *orig_node, char *message)
 475 {
 476         struct hna_global_entry *hna_global_entry;
 477         int hna_buff_count = 0;
 478         unsigned char *hna_ptr;
 479
 480         if (orig_node->hna_buff_len == 0)
 481                 return;
 482
 483         spin_lock_bh(&bat_priv->hna_ghash_lock);
 484
 485         while ((hna_buff_count + 1) * ETH_ALEN <= orig_node->hna_buff_len) {
 486                 hna_ptr = orig_node->hna_buff + (hna_buff_count * ETH_ALEN);
 487                 hna_global_entry = (struct hna_global_entry *)
 488                         hash_find(bat_priv->hna_global_hash, compare_orig,
 489                                   choose_orig, hna_ptr);
 490
 491                 if ((hna_global_entry) &&
 492                     (hna_global_entry->orig_node == orig_node))
 493                         _hna_global_del_orig(bat_priv, hna_global_entry,
 494                                              message);
 495
 496                 hna_buff_count++;
 497         }
 498
 499         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 500
 501         orig_node->hna_buff_len = 0;
 502         kfree(orig_node->hna_buff);
 503         orig_node->hna_buff = NULL;
 504 }
 505
 506 static void hna_global_del(void *data, void *arg)
 507 {
 508         kfree(data);
 509 }
 510
 511 void hna_global_free(struct bat_priv *bat_priv)
 512 {
 513         if (!bat_priv->hna_global_hash)
 514                 return;
 515
 516         hash_delete(bat_priv->hna_global_hash, hna_global_del, NULL);
 517         bat_priv->hna_global_hash = NULL;
 518 }
 519
 520 struct orig_node *transtable_search(struct bat_priv *bat_priv, uint8_t *addr)
 521 {
 522         struct hna_global_entry *hna_global_entry;
 523
 524         spin_lock_bh(&bat_priv->hna_ghash_lock);
 525         hna_global_entry = (struct hna_global_entry *)
 526                                 hash_find(bat_priv->hna_global_hash,
 527                                           compare_orig, choose_orig, addr);
 528         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 529
 530         if (!hna_global_entry)
 531                 return NULL;
 532
 533         return hna_global_entry->orig_node;
 534 }