Pileus Git - ~andy/linux/blob - net/batman-adv/translation-table.c

   1 /*
   2  * Copyright (C) 2007-2011 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 "hash.h"
  26 #include "originator.h"
  27
  28 static void hna_local_purge(struct work_struct *work);
  29 static void _hna_global_del_orig(struct bat_priv *bat_priv,
  30                                  struct hna_global_entry *hna_global_entry,
  31                                  char *message);
  32
  33 static void hna_local_start_timer(struct bat_priv *bat_priv)
  34 {
  35         INIT_DELAYED_WORK(&bat_priv->hna_work, hna_local_purge);
  36         queue_delayed_work(bat_event_workqueue, &bat_priv->hna_work, 10 * HZ);
  37 }
  38
  39 int hna_local_init(struct bat_priv *bat_priv)
  40 {
  41         if (bat_priv->hna_local_hash)
  42                 return 1;
  43
  44         bat_priv->hna_local_hash = hash_new(1024);
  45
  46         if (!bat_priv->hna_local_hash)
  47                 return 0;
  48
  49         atomic_set(&bat_priv->hna_local_changed, 0);
  50         hna_local_start_timer(bat_priv);
  51
  52         return 1;
  53 }
  54
  55 void hna_local_add(struct net_device *soft_iface, uint8_t *addr)
  56 {
  57         struct bat_priv *bat_priv = netdev_priv(soft_iface);
  58         struct hna_local_entry *hna_local_entry;
  59         struct hna_global_entry *hna_global_entry;
  60         int required_bytes;
  61
  62         spin_lock_bh(&bat_priv->hna_lhash_lock);
  63         hna_local_entry =
  64                 ((struct hna_local_entry *)hash_find(bat_priv->hna_local_hash,
  65                                                      compare_orig, choose_orig,
  66                                                      addr));
  67         spin_unlock_bh(&bat_priv->hna_lhash_lock);
  68
  69         if (hna_local_entry) {
  70                 hna_local_entry->last_seen = jiffies;
  71                 return;
  72         }
  73
  74         /* only announce as many hosts as possible in the batman-packet and
  75            space in batman_packet->num_hna That also should give a limit to
  76            MAC-flooding. */
  77         required_bytes = (bat_priv->num_local_hna + 1) * ETH_ALEN;
  78         required_bytes += BAT_PACKET_LEN;
  79
  80         if ((required_bytes > ETH_DATA_LEN) ||
  81             (atomic_read(&bat_priv->aggregated_ogms) &&
  82              required_bytes > MAX_AGGREGATION_BYTES) ||
  83             (bat_priv->num_local_hna + 1 > 255)) {
  84                 bat_dbg(DBG_ROUTES, bat_priv,
  85                         "Can't add new local hna entry (%pM): "
  86                         "number of local hna entries exceeds packet size\n",
  87                         addr);
  88                 return;
  89         }
  90
  91         bat_dbg(DBG_ROUTES, bat_priv,
  92                 "Creating new local hna entry: %pM\n", addr);
  93
  94         hna_local_entry = kmalloc(sizeof(struct hna_local_entry), GFP_ATOMIC);
  95         if (!hna_local_entry)
  96                 return;
  97
  98         memcpy(hna_local_entry->addr, addr, ETH_ALEN);
  99         hna_local_entry->last_seen = jiffies;
 100
 101         /* the batman interface mac address should never be purged */
 102         if (compare_orig(addr, soft_iface->dev_addr))
 103                 hna_local_entry->never_purge = 1;
 104         else
 105                 hna_local_entry->never_purge = 0;
 106
 107         spin_lock_bh(&bat_priv->hna_lhash_lock);
 108
 109         hash_add(bat_priv->hna_local_hash, compare_orig, choose_orig,
 110                  hna_local_entry);
 111         bat_priv->num_local_hna++;
 112         atomic_set(&bat_priv->hna_local_changed, 1);
 113
 114         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 115
 116         /* remove address from global hash if present */
 117         spin_lock_bh(&bat_priv->hna_ghash_lock);
 118
 119         hna_global_entry = ((struct hna_global_entry *)
 120                                 hash_find(bat_priv->hna_global_hash,
 121                                           compare_orig, choose_orig, addr));
 122
 123         if (hna_global_entry)
 124                 _hna_global_del_orig(bat_priv, hna_global_entry,
 125                                      "local hna received");
 126
 127         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 128 }
 129
 130 int hna_local_fill_buffer(struct bat_priv *bat_priv,
 131                           unsigned char *buff, int buff_len)
 132 {
 133         struct hashtable_t *hash = bat_priv->hna_local_hash;
 134         struct hna_local_entry *hna_local_entry;
 135         struct element_t *bucket;
 136         int i;
 137         struct hlist_node *walk;
 138         struct hlist_head *head;
 139         int count = 0;
 140
 141         spin_lock_bh(&bat_priv->hna_lhash_lock);
 142
 143         for (i = 0; i < hash->size; i++) {
 144                 head = &hash->table[i];
 145
 146                 hlist_for_each_entry(bucket, walk, head, hlist) {
 147
 148                         if (buff_len < (count + 1) * ETH_ALEN)
 149                                 break;
 150
 151                         hna_local_entry = bucket->data;
 152                         memcpy(buff + (count * ETH_ALEN), hna_local_entry->addr,
 153                                ETH_ALEN);
 154
 155                         count++;
 156                 }
 157         }
 158
 159         /* if we did not get all new local hnas see you next time  ;-) */
 160         if (count == bat_priv->num_local_hna)
 161                 atomic_set(&bat_priv->hna_local_changed, 0);
 162
 163         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 164         return count;
 165 }
 166
 167 int hna_local_seq_print_text(struct seq_file *seq, void *offset)
 168 {
 169         struct net_device *net_dev = (struct net_device *)seq->private;
 170         struct bat_priv *bat_priv = netdev_priv(net_dev);
 171         struct hashtable_t *hash = bat_priv->hna_local_hash;
 172         struct hna_local_entry *hna_local_entry;
 173         int i;
 174         struct hlist_node *walk;
 175         struct hlist_head *head;
 176         struct element_t *bucket;
 177         size_t buf_size, pos;
 178         char *buff;
 179
 180         if (!bat_priv->primary_if) {
 181                 return seq_printf(seq, "BATMAN mesh %s disabled - "
 182                                "please specify interfaces to enable it\n",
 183                                net_dev->name);
 184         }
 185
 186         seq_printf(seq, "Locally retrieved addresses (from %s) "
 187                    "announced via HNA:\n",
 188                    net_dev->name);
 189
 190         spin_lock_bh(&bat_priv->hna_lhash_lock);
 191
 192         buf_size = 1;
 193         /* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
 194         for (i = 0; i < hash->size; i++) {
 195                 head = &hash->table[i];
 196
 197                 hlist_for_each(walk, head)
 198                         buf_size += 21;
 199         }
 200
 201         buff = kmalloc(buf_size, GFP_ATOMIC);
 202         if (!buff) {
 203                 spin_unlock_bh(&bat_priv->hna_lhash_lock);
 204                 return -ENOMEM;
 205         }
 206         buff[0] = '\0';
 207         pos = 0;
 208
 209         for (i = 0; i < hash->size; i++) {
 210                 head = &hash->table[i];
 211
 212                 hlist_for_each_entry(bucket, walk, head, hlist) {
 213                         hna_local_entry = bucket->data;
 214
 215                         pos += snprintf(buff + pos, 22, " * %pM\n",
 216                                         hna_local_entry->addr);
 217                 }
 218         }
 219
 220         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 221
 222         seq_printf(seq, "%s", buff);
 223         kfree(buff);
 224         return 0;
 225 }
 226
 227 static void _hna_local_del(void *data, void *arg)
 228 {
 229         struct bat_priv *bat_priv = (struct bat_priv *)arg;
 230
 231         kfree(data);
 232         bat_priv->num_local_hna--;
 233         atomic_set(&bat_priv->hna_local_changed, 1);
 234 }
 235
 236 static void hna_local_del(struct bat_priv *bat_priv,
 237                           struct hna_local_entry *hna_local_entry,
 238                           char *message)
 239 {
 240         bat_dbg(DBG_ROUTES, bat_priv, "Deleting local hna entry (%pM): %s\n",
 241                 hna_local_entry->addr, message);
 242
 243         hash_remove(bat_priv->hna_local_hash, compare_orig, choose_orig,
 244                     hna_local_entry->addr);
 245         _hna_local_del(hna_local_entry, bat_priv);
 246 }
 247
 248 void hna_local_remove(struct bat_priv *bat_priv,
 249                       uint8_t *addr, char *message)
 250 {
 251         struct hna_local_entry *hna_local_entry;
 252
 253         spin_lock_bh(&bat_priv->hna_lhash_lock);
 254
 255         hna_local_entry = (struct hna_local_entry *)
 256                 hash_find(bat_priv->hna_local_hash, compare_orig, choose_orig,
 257                           addr);
 258
 259         if (hna_local_entry)
 260                 hna_local_del(bat_priv, hna_local_entry, message);
 261
 262         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 263 }
 264
 265 static void hna_local_purge(struct work_struct *work)
 266 {
 267         struct delayed_work *delayed_work =
 268                 container_of(work, struct delayed_work, work);
 269         struct bat_priv *bat_priv =
 270                 container_of(delayed_work, struct bat_priv, hna_work);
 271         struct hashtable_t *hash = bat_priv->hna_local_hash;
 272         struct hna_local_entry *hna_local_entry;
 273         int i;
 274         struct hlist_node *walk, *safe;
 275         struct hlist_head *head;
 276         struct element_t *bucket;
 277         unsigned long timeout;
 278
 279         spin_lock_bh(&bat_priv->hna_lhash_lock);
 280
 281         for (i = 0; i < hash->size; i++) {
 282                 head = &hash->table[i];
 283
 284                 hlist_for_each_entry_safe(bucket, walk, safe, head, hlist) {
 285                         hna_local_entry = bucket->data;
 286
 287                         timeout = hna_local_entry->last_seen;
 288                         timeout += LOCAL_HNA_TIMEOUT * HZ;
 289
 290                         if ((!hna_local_entry->never_purge) &&
 291                             time_after(jiffies, timeout))
 292                                 hna_local_del(bat_priv, hna_local_entry,
 293                                         "address timed out");
 294                 }
 295         }
 296
 297         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 298         hna_local_start_timer(bat_priv);
 299 }
 300
 301 void hna_local_free(struct bat_priv *bat_priv)
 302 {
 303         if (!bat_priv->hna_local_hash)
 304                 return;
 305
 306         cancel_delayed_work_sync(&bat_priv->hna_work);
 307         hash_delete(bat_priv->hna_local_hash, _hna_local_del, bat_priv);
 308         bat_priv->hna_local_hash = NULL;
 309 }
 310
 311 int hna_global_init(struct bat_priv *bat_priv)
 312 {
 313         if (bat_priv->hna_global_hash)
 314                 return 1;
 315
 316         bat_priv->hna_global_hash = hash_new(1024);
 317
 318         if (!bat_priv->hna_global_hash)
 319                 return 0;
 320
 321         return 1;
 322 }
 323
 324 void hna_global_add_orig(struct bat_priv *bat_priv,
 325                          struct orig_node *orig_node,
 326                          unsigned char *hna_buff, int hna_buff_len)
 327 {
 328         struct hna_global_entry *hna_global_entry;
 329         struct hna_local_entry *hna_local_entry;
 330         int hna_buff_count = 0;
 331         unsigned char *hna_ptr;
 332
 333         while ((hna_buff_count + 1) * ETH_ALEN <= hna_buff_len) {
 334                 spin_lock_bh(&bat_priv->hna_ghash_lock);
 335
 336                 hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
 337                 hna_global_entry = (struct hna_global_entry *)
 338                         hash_find(bat_priv->hna_global_hash, compare_orig,
 339                                   choose_orig, hna_ptr);
 340
 341                 if (!hna_global_entry) {
 342                         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 343
 344                         hna_global_entry =
 345                                 kmalloc(sizeof(struct hna_global_entry),
 346                                         GFP_ATOMIC);
 347
 348                         if (!hna_global_entry)
 349                                 break;
 350
 351                         memcpy(hna_global_entry->addr, hna_ptr, ETH_ALEN);
 352
 353                         bat_dbg(DBG_ROUTES, bat_priv,
 354                                 "Creating new global hna entry: "
 355                                 "%pM (via %pM)\n",
 356                                 hna_global_entry->addr, orig_node->orig);
 357
 358                         spin_lock_bh(&bat_priv->hna_ghash_lock);
 359                         hash_add(bat_priv->hna_global_hash, compare_orig,
 360                                  choose_orig, hna_global_entry);
 361
 362                 }
 363
 364                 hna_global_entry->orig_node = orig_node;
 365                 spin_unlock_bh(&bat_priv->hna_ghash_lock);
 366
 367                 /* remove address from local hash if present */
 368                 spin_lock_bh(&bat_priv->hna_lhash_lock);
 369
 370                 hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
 371                 hna_local_entry = (struct hna_local_entry *)
 372                         hash_find(bat_priv->hna_local_hash, compare_orig,
 373                                   choose_orig, hna_ptr);
 374
 375                 if (hna_local_entry)
 376                         hna_local_del(bat_priv, hna_local_entry,
 377                                       "global hna received");
 378
 379                 spin_unlock_bh(&bat_priv->hna_lhash_lock);
 380
 381                 hna_buff_count++;
 382         }
 383
 384         /* initialize, and overwrite if malloc succeeds */
 385         orig_node->hna_buff = NULL;
 386         orig_node->hna_buff_len = 0;
 387
 388         if (hna_buff_len > 0) {
 389                 orig_node->hna_buff = kmalloc(hna_buff_len, GFP_ATOMIC);
 390                 if (orig_node->hna_buff) {
 391                         memcpy(orig_node->hna_buff, hna_buff, hna_buff_len);
 392                         orig_node->hna_buff_len = hna_buff_len;
 393                 }
 394         }
 395 }
 396
 397 int hna_global_seq_print_text(struct seq_file *seq, void *offset)
 398 {
 399         struct net_device *net_dev = (struct net_device *)seq->private;
 400         struct bat_priv *bat_priv = netdev_priv(net_dev);
 401         struct hashtable_t *hash = bat_priv->hna_global_hash;
 402         struct hna_global_entry *hna_global_entry;
 403         int i;
 404         struct hlist_node *walk;
 405         struct hlist_head *head;
 406         struct element_t *bucket;
 407         size_t buf_size, pos;
 408         char *buff;
 409
 410         if (!bat_priv->primary_if) {
 411                 return seq_printf(seq, "BATMAN mesh %s disabled - "
 412                                   "please specify interfaces to enable it\n",
 413                                   net_dev->name);
 414         }
 415
 416         seq_printf(seq, "Globally announced HNAs received via the mesh %s\n",
 417                    net_dev->name);
 418
 419         spin_lock_bh(&bat_priv->hna_ghash_lock);
 420
 421         buf_size = 1;
 422         /* Estimate length for: " * xx:xx:xx:xx:xx:xx via xx:xx:xx:xx:xx:xx\n"*/
 423         for (i = 0; i < hash->size; i++) {
 424                 head = &hash->table[i];
 425
 426                 hlist_for_each(walk, head)
 427                         buf_size += 43;
 428         }
 429
 430         buff = kmalloc(buf_size, GFP_ATOMIC);
 431         if (!buff) {
 432                 spin_unlock_bh(&bat_priv->hna_ghash_lock);
 433                 return -ENOMEM;
 434         }
 435         buff[0] = '\0';
 436         pos = 0;
 437
 438         for (i = 0; i < hash->size; i++) {
 439                 head = &hash->table[i];
 440
 441                 hlist_for_each_entry(bucket, walk, head, hlist) {
 442                         hna_global_entry = bucket->data;
 443
 444                         pos += snprintf(buff + pos, 44,
 445                                         " * %pM via %pM\n",
 446                                         hna_global_entry->addr,
 447                                         hna_global_entry->orig_node->orig);
 448                 }
 449         }
 450
 451         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 452
 453         seq_printf(seq, "%s", buff);
 454         kfree(buff);
 455         return 0;
 456 }
 457
 458 static void _hna_global_del_orig(struct bat_priv *bat_priv,
 459                                  struct hna_global_entry *hna_global_entry,
 460                                  char *message)
 461 {
 462         bat_dbg(DBG_ROUTES, bat_priv,
 463                 "Deleting global hna entry %pM (via %pM): %s\n",
 464                 hna_global_entry->addr, hna_global_entry->orig_node->orig,
 465                 message);
 466
 467         hash_remove(bat_priv->hna_global_hash, compare_orig, choose_orig,
 468                     hna_global_entry->addr);
 469         kfree(hna_global_entry);
 470 }
 471
 472 void hna_global_del_orig(struct bat_priv *bat_priv,
 473                          struct orig_node *orig_node, char *message)
 474 {
 475         struct hna_global_entry *hna_global_entry;
 476         int hna_buff_count = 0;
 477         unsigned char *hna_ptr;
 478
 479         if (orig_node->hna_buff_len == 0)
 480                 return;
 481
 482         spin_lock_bh(&bat_priv->hna_ghash_lock);
 483
 484         while ((hna_buff_count + 1) * ETH_ALEN <= orig_node->hna_buff_len) {
 485                 hna_ptr = orig_node->hna_buff + (hna_buff_count * ETH_ALEN);
 486                 hna_global_entry = (struct hna_global_entry *)
 487                         hash_find(bat_priv->hna_global_hash, compare_orig,
 488                                   choose_orig, hna_ptr);
 489
 490                 if ((hna_global_entry) &&
 491                     (hna_global_entry->orig_node == orig_node))
 492                         _hna_global_del_orig(bat_priv, hna_global_entry,
 493                                              message);
 494
 495                 hna_buff_count++;
 496         }
 497
 498         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 499
 500         orig_node->hna_buff_len = 0;
 501         kfree(orig_node->hna_buff);
 502         orig_node->hna_buff = NULL;
 503 }
 504
 505 static void hna_global_del(void *data, void *arg)
 506 {
 507         kfree(data);
 508 }
 509
 510 void hna_global_free(struct bat_priv *bat_priv)
 511 {
 512         if (!bat_priv->hna_global_hash)
 513                 return;
 514
 515         hash_delete(bat_priv->hna_global_hash, hna_global_del, NULL);
 516         bat_priv->hna_global_hash = NULL;
 517 }
 518
 519 struct orig_node *transtable_search(struct bat_priv *bat_priv, uint8_t *addr)
 520 {
 521         struct hna_global_entry *hna_global_entry;
 522
 523         spin_lock_bh(&bat_priv->hna_ghash_lock);
 524         hna_global_entry = (struct hna_global_entry *)
 525                                 hash_find(bat_priv->hna_global_hash,
 526                                           compare_orig, choose_orig, addr);
 527         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 528
 529         if (!hna_global_entry)
 530                 return NULL;
 531
 532         return hna_global_entry->orig_node;
 533 }