drivers/staging/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
  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(128, compare_orig, choose_orig);
  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         struct hashtable_t *swaphash;
  61         unsigned long flags;
  62         int required_bytes;
  63
  64         spin_lock_irqsave(&bat_priv->hna_lhash_lock, flags);
  65         hna_local_entry =
  66                 ((struct hna_local_entry *)hash_find(bat_priv->hna_local_hash,
  67                                                      addr));
  68         spin_unlock_irqrestore(&bat_priv->hna_lhash_lock, flags);
  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->aggregation_enabled) &&
  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_irqsave(&bat_priv->hna_lhash_lock, flags);
 109
 110         hash_add(bat_priv->hna_local_hash, hna_local_entry);
 111         bat_priv->num_local_hna++;
 112         atomic_set(&bat_priv->hna_local_changed, 1);
 113
 114         if (bat_priv->hna_local_hash->elements * 4 >
 115                                         bat_priv->hna_local_hash->size) {
 116                 swaphash = hash_resize(bat_priv->hna_local_hash,
 117                                        bat_priv->hna_local_hash->size * 2);
 118
 119                 if (!swaphash)
 120                         pr_err("Couldn't resize local hna hash table\n");
 121                 else
 122                         bat_priv->hna_local_hash = swaphash;
 123         }
 124
 125         spin_unlock_irqrestore(&bat_priv->hna_lhash_lock, flags);
 126
 127         /* remove address from global hash if present */
 128         spin_lock_irqsave(&bat_priv->hna_ghash_lock, flags);
 129
 130         hna_global_entry = ((struct hna_global_entry *)
 131                                 hash_find(bat_priv->hna_global_hash, addr));
 132
 133         if (hna_global_entry)
 134                 _hna_global_del_orig(bat_priv, hna_global_entry,
 135                                      "local hna received");
 136
 137         spin_unlock_irqrestore(&bat_priv->hna_ghash_lock, flags);
 138 }
 139
 140 int hna_local_fill_buffer(struct bat_priv *bat_priv,
 141                           unsigned char *buff, int buff_len)
 142 {
 143         struct hna_local_entry *hna_local_entry;
 144         HASHIT(hashit);
 145         int i = 0;
 146         unsigned long flags;
 147
 148         spin_lock_irqsave(&bat_priv->hna_lhash_lock, flags);
 149
 150         while (hash_iterate(bat_priv->hna_local_hash, &hashit)) {
 151
 152                 if (buff_len < (i + 1) * ETH_ALEN)
 153                         break;
 154
 155                 hna_local_entry = hashit.bucket->data;
 156                 memcpy(buff + (i * ETH_ALEN), hna_local_entry->addr, ETH_ALEN);
 157
 158                 i++;
 159         }
 160
 161         /* if we did not get all new local hnas see you next time  ;-) */
 162         if (i == bat_priv->num_local_hna)
 163                 atomic_set(&bat_priv->hna_local_changed, 0);
 164
 165         spin_unlock_irqrestore(&bat_priv->hna_lhash_lock, flags);
 166         return i;
 167 }
 168
 169 int hna_local_seq_print_text(struct seq_file *seq, void *offset)
 170 {
 171         struct net_device *net_dev = (struct net_device *)seq->private;
 172         struct bat_priv *bat_priv = netdev_priv(net_dev);
 173         struct hna_local_entry *hna_local_entry;
 174         HASHIT(hashit);
 175         HASHIT(hashit_count);
 176         unsigned long flags;
 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_irqsave(&bat_priv->hna_lhash_lock, flags);
 191
 192         buf_size = 1;
 193         /* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
 194         while (hash_iterate(bat_priv->hna_local_hash, &hashit_count))
 195                 buf_size += 21;
 196
 197         buff = kmalloc(buf_size, GFP_ATOMIC);
 198         if (!buff) {
 199                 spin_unlock_irqrestore(&bat_priv->hna_lhash_lock, flags);
 200                 return -ENOMEM;
 201         }
 202         buff[0] = '\0';
 203         pos = 0;
 204
 205         while (hash_iterate(bat_priv->hna_local_hash, &hashit)) {
 206                 hna_local_entry = hashit.bucket->data;
 207
 208                 pos += snprintf(buff + pos, 22, " * %pM\n",
 209                                 hna_local_entry->addr);
 210         }
 211
 212         spin_unlock_irqrestore(&bat_priv->hna_lhash_lock, flags);
 213
 214         seq_printf(seq, "%s", buff);
 215         kfree(buff);
 216         return 0;
 217 }
 218
 219 static void _hna_local_del(void *data, void *arg)
 220 {
 221         struct bat_priv *bat_priv = (struct bat_priv *)arg;
 222
 223         kfree(data);
 224         bat_priv->num_local_hna--;
 225         atomic_set(&bat_priv->hna_local_changed, 1);
 226 }
 227
 228 static void hna_local_del(struct bat_priv *bat_priv,
 229                           struct hna_local_entry *hna_local_entry,
 230                           char *message)
 231 {
 232         bat_dbg(DBG_ROUTES, bat_priv, "Deleting local hna entry (%pM): %s\n",
 233                 hna_local_entry->addr, message);
 234
 235         hash_remove(bat_priv->hna_local_hash, hna_local_entry->addr);
 236         _hna_local_del(hna_local_entry, bat_priv);
 237 }
 238
 239 void hna_local_remove(struct bat_priv *bat_priv,
 240                       uint8_t *addr, char *message)
 241 {
 242         struct hna_local_entry *hna_local_entry;
 243         unsigned long flags;
 244
 245         spin_lock_irqsave(&bat_priv->hna_lhash_lock, flags);
 246
 247         hna_local_entry = (struct hna_local_entry *)
 248                 hash_find(bat_priv->hna_local_hash, addr);
 249         if (hna_local_entry)
 250                 hna_local_del(bat_priv, hna_local_entry, message);
 251
 252         spin_unlock_irqrestore(&bat_priv->hna_lhash_lock, flags);
 253 }
 254
 255 static void hna_local_purge(struct work_struct *work)
 256 {
 257         struct delayed_work *delayed_work =
 258                 container_of(work, struct delayed_work, work);
 259         struct bat_priv *bat_priv =
 260                 container_of(delayed_work, struct bat_priv, hna_work);
 261         struct hna_local_entry *hna_local_entry;
 262         HASHIT(hashit);
 263         unsigned long flags;
 264         unsigned long timeout;
 265
 266         spin_lock_irqsave(&bat_priv->hna_lhash_lock, flags);
 267
 268         while (hash_iterate(bat_priv->hna_local_hash, &hashit)) {
 269                 hna_local_entry = hashit.bucket->data;
 270
 271                 timeout = hna_local_entry->last_seen + LOCAL_HNA_TIMEOUT * HZ;
 272
 273                 if ((!hna_local_entry->never_purge) &&
 274                     time_after(jiffies, timeout))
 275                         hna_local_del(bat_priv, hna_local_entry,
 276                                       "address timed out");
 277         }
 278
 279         spin_unlock_irqrestore(&bat_priv->hna_lhash_lock, flags);
 280         hna_local_start_timer(bat_priv);
 281 }
 282
 283 void hna_local_free(struct bat_priv *bat_priv)
 284 {
 285         if (!bat_priv->hna_local_hash)
 286                 return;
 287
 288         cancel_delayed_work_sync(&bat_priv->hna_work);
 289         hash_delete(bat_priv->hna_local_hash, _hna_local_del, bat_priv);
 290         bat_priv->hna_local_hash = NULL;
 291 }
 292
 293 int hna_global_init(struct bat_priv *bat_priv)
 294 {
 295         if (bat_priv->hna_global_hash)
 296                 return 1;
 297
 298         bat_priv->hna_global_hash = hash_new(128, compare_orig, choose_orig);
 299
 300         if (!bat_priv->hna_global_hash)
 301                 return 0;
 302
 303         return 1;
 304 }
 305
 306 void hna_global_add_orig(struct bat_priv *bat_priv,
 307                          struct orig_node *orig_node,
 308                          unsigned char *hna_buff, int hna_buff_len)
 309 {
 310         struct hna_global_entry *hna_global_entry;
 311         struct hna_local_entry *hna_local_entry;
 312         struct hashtable_t *swaphash;
 313         int hna_buff_count = 0;
 314         unsigned long flags;
 315         unsigned char *hna_ptr;
 316
 317         while ((hna_buff_count + 1) * ETH_ALEN <= hna_buff_len) {
 318                 spin_lock_irqsave(&bat_priv->hna_ghash_lock, flags);
 319
 320                 hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
 321                 hna_global_entry = (struct hna_global_entry *)
 322                         hash_find(bat_priv->hna_global_hash, hna_ptr);
 323
 324                 if (!hna_global_entry) {
 325                         spin_unlock_irqrestore(&bat_priv->hna_ghash_lock,
 326                                                flags);
 327
 328                         hna_global_entry =
 329                                 kmalloc(sizeof(struct hna_global_entry),
 330                                         GFP_ATOMIC);
 331
 332                         if (!hna_global_entry)
 333                                 break;
 334
 335                         memcpy(hna_global_entry->addr, hna_ptr, ETH_ALEN);
 336
 337                         bat_dbg(DBG_ROUTES, bat_priv,
 338                                 "Creating new global hna entry: "
 339                                 "%pM (via %pM)\n",
 340                                 hna_global_entry->addr, orig_node->orig);
 341
 342                         spin_lock_irqsave(&bat_priv->hna_ghash_lock, flags);
 343                         hash_add(bat_priv->hna_global_hash, hna_global_entry);
 344
 345                 }
 346
 347                 hna_global_entry->orig_node = orig_node;
 348                 spin_unlock_irqrestore(&bat_priv->hna_ghash_lock, flags);
 349
 350                 /* remove address from local hash if present */
 351                 spin_lock_irqsave(&bat_priv->hna_lhash_lock, flags);
 352
 353                 hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
 354                 hna_local_entry = (struct hna_local_entry *)
 355                         hash_find(bat_priv->hna_local_hash, hna_ptr);
 356
 357                 if (hna_local_entry)
 358                         hna_local_del(bat_priv, hna_local_entry,
 359                                       "global hna received");
 360
 361                 spin_unlock_irqrestore(&bat_priv->hna_lhash_lock, flags);
 362
 363                 hna_buff_count++;
 364         }
 365
 366         /* initialize, and overwrite if malloc succeeds */
 367         orig_node->hna_buff = NULL;
 368         orig_node->hna_buff_len = 0;
 369
 370         if (hna_buff_len > 0) {
 371                 orig_node->hna_buff = kmalloc(hna_buff_len, GFP_ATOMIC);
 372                 if (orig_node->hna_buff) {
 373                         memcpy(orig_node->hna_buff, hna_buff, hna_buff_len);
 374                         orig_node->hna_buff_len = hna_buff_len;
 375                 }
 376         }
 377
 378         spin_lock_irqsave(&bat_priv->hna_ghash_lock, flags);
 379
 380         if (bat_priv->hna_global_hash->elements * 4 >
 381                                         bat_priv->hna_global_hash->size) {
 382                 swaphash = hash_resize(bat_priv->hna_global_hash,
 383                                        bat_priv->hna_global_hash->size * 2);
 384
 385                 if (!swaphash)
 386                         pr_err("Couldn't resize global hna hash table\n");
 387                 else
 388                         bat_priv->hna_global_hash = swaphash;
 389         }
 390
 391         spin_unlock_irqrestore(&bat_priv->hna_ghash_lock, flags);
 392 }
 393
 394 int hna_global_seq_print_text(struct seq_file *seq, void *offset)
 395 {
 396         struct net_device *net_dev = (struct net_device *)seq->private;
 397         struct bat_priv *bat_priv = netdev_priv(net_dev);
 398         struct hna_global_entry *hna_global_entry;
 399         HASHIT(hashit);
 400         HASHIT(hashit_count);
 401         unsigned long flags;
 402         size_t buf_size, pos;
 403         char *buff;
 404
 405         if (!bat_priv->primary_if) {
 406                 return seq_printf(seq, "BATMAN mesh %s disabled - "
 407                                   "please specify interfaces to enable it\n",
 408                                   net_dev->name);
 409         }
 410
 411         seq_printf(seq, "Globally announced HNAs received via the mesh %s\n",
 412                    net_dev->name);
 413
 414         spin_lock_irqsave(&bat_priv->hna_ghash_lock, flags);
 415
 416         buf_size = 1;
 417         /* Estimate length for: " * xx:xx:xx:xx:xx:xx via xx:xx:xx:xx:xx:xx\n"*/
 418         while (hash_iterate(bat_priv->hna_global_hash, &hashit_count))
 419                 buf_size += 43;
 420
 421         buff = kmalloc(buf_size, GFP_ATOMIC);
 422         if (!buff) {
 423                 spin_unlock_irqrestore(&bat_priv->hna_ghash_lock, flags);
 424                 return -ENOMEM;
 425         }
 426         buff[0] = '\0';
 427         pos = 0;
 428
 429         while (hash_iterate(bat_priv->hna_global_hash, &hashit)) {
 430                 hna_global_entry = hashit.bucket->data;
 431
 432                 pos += snprintf(buff + pos, 44,
 433                                 " * %pM via %pM\n", hna_global_entry->addr,
 434                                 hna_global_entry->orig_node->orig);
 435         }
 436
 437         spin_unlock_irqrestore(&bat_priv->hna_ghash_lock, flags);
 438
 439         seq_printf(seq, "%s", buff);
 440         kfree(buff);
 441         return 0;
 442 }
 443
 444 static void _hna_global_del_orig(struct bat_priv *bat_priv,
 445                                  struct hna_global_entry *hna_global_entry,
 446                                  char *message)
 447 {
 448         bat_dbg(DBG_ROUTES, bat_priv,
 449                 "Deleting global hna entry %pM (via %pM): %s\n",
 450                 hna_global_entry->addr, hna_global_entry->orig_node->orig,
 451                 message);
 452
 453         hash_remove(bat_priv->hna_global_hash, hna_global_entry->addr);
 454         kfree(hna_global_entry);
 455 }
 456
 457 void hna_global_del_orig(struct bat_priv *bat_priv,
 458                          struct orig_node *orig_node, char *message)
 459 {
 460         struct hna_global_entry *hna_global_entry;
 461         int hna_buff_count = 0;
 462         unsigned long flags;
 463         unsigned char *hna_ptr;
 464
 465         if (orig_node->hna_buff_len == 0)
 466                 return;
 467
 468         spin_lock_irqsave(&bat_priv->hna_ghash_lock, flags);
 469
 470         while ((hna_buff_count + 1) * ETH_ALEN <= orig_node->hna_buff_len) {
 471                 hna_ptr = orig_node->hna_buff + (hna_buff_count * ETH_ALEN);
 472                 hna_global_entry = (struct hna_global_entry *)
 473                         hash_find(bat_priv->hna_global_hash, hna_ptr);
 474
 475                 if ((hna_global_entry) &&
 476                     (hna_global_entry->orig_node == orig_node))
 477                         _hna_global_del_orig(bat_priv, hna_global_entry,
 478                                              message);
 479
 480                 hna_buff_count++;
 481         }
 482
 483         spin_unlock_irqrestore(&bat_priv->hna_ghash_lock, flags);
 484
 485         orig_node->hna_buff_len = 0;
 486         kfree(orig_node->hna_buff);
 487         orig_node->hna_buff = NULL;
 488 }
 489
 490 static void hna_global_del(void *data, void *arg)
 491 {
 492         kfree(data);
 493 }
 494
 495 void hna_global_free(struct bat_priv *bat_priv)
 496 {
 497         if (!bat_priv->hna_global_hash)
 498                 return;
 499
 500         hash_delete(bat_priv->hna_global_hash, hna_global_del, NULL);
 501         bat_priv->hna_global_hash = NULL;
 502 }
 503
 504 struct orig_node *transtable_search(struct bat_priv *bat_priv, uint8_t *addr)
 505 {
 506         struct hna_global_entry *hna_global_entry;
 507         unsigned long flags;
 508
 509         spin_lock_irqsave(&bat_priv->hna_ghash_lock, flags);
 510         hna_global_entry = (struct hna_global_entry *)
 511                                 hash_find(bat_priv->hna_global_hash, addr);
 512         spin_unlock_irqrestore(&bat_priv->hna_ghash_lock, flags);
 513
 514         if (!hna_global_entry)
 515                 return NULL;
 516
 517         return hna_global_entry->orig_node;
 518 }