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 struct hashtable_t *hna_local_hash;
  29 static struct hashtable_t *hna_global_hash;
  30 atomic_t hna_local_changed;
  31
  32 DEFINE_SPINLOCK(hna_local_hash_lock);
  33 static DEFINE_SPINLOCK(hna_global_hash_lock);
  34
  35 static void hna_local_purge(struct work_struct *work);
  36 static DECLARE_DELAYED_WORK(hna_local_purge_wq, hna_local_purge);
  37 static void _hna_global_del_orig(struct hna_global_entry *hna_global_entry,
  38                                  char *message);
  39
  40 static void hna_local_start_timer(void)
  41 {
  42         queue_delayed_work(bat_event_workqueue, &hna_local_purge_wq, 10 * HZ);
  43 }
  44
  45 int hna_local_init(void)
  46 {
  47         if (hna_local_hash)
  48                 return 1;
  49
  50         hna_local_hash = hash_new(128, compare_orig, choose_orig);
  51
  52         if (!hna_local_hash)
  53                 return 0;
  54
  55         atomic_set(&hna_local_changed, 0);
  56         hna_local_start_timer();
  57
  58         return 1;
  59 }
  60
  61 void hna_local_add(uint8_t *addr)
  62 {
  63         /* FIXME: each orig_node->batman_if will be attached to a softif */
  64         struct bat_priv *bat_priv = netdev_priv(soft_device);
  65         struct hna_local_entry *hna_local_entry;
  66         struct hna_global_entry *hna_global_entry;
  67         struct hashtable_t *swaphash;
  68         unsigned long flags;
  69
  70         spin_lock_irqsave(&hna_local_hash_lock, flags);
  71         hna_local_entry =
  72                 ((struct hna_local_entry *)hash_find(hna_local_hash, addr));
  73         spin_unlock_irqrestore(&hna_local_hash_lock, flags);
  74
  75         if (hna_local_entry != NULL) {
  76                 hna_local_entry->last_seen = jiffies;
  77                 return;
  78         }
  79
  80         /* only announce as many hosts as possible in the batman-packet and
  81            space in batman_packet->num_hna That also should give a limit to
  82            MAC-flooding. */
  83         if ((num_hna + 1 > (ETH_DATA_LEN - BAT_PACKET_LEN) / ETH_ALEN) ||
  84             (num_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_device->dev_addr))
 104                 hna_local_entry->never_purge = 1;
 105         else
 106                 hna_local_entry->never_purge = 0;
 107
 108         spin_lock_irqsave(&hna_local_hash_lock, flags);
 109
 110         hash_add(hna_local_hash, hna_local_entry);
 111         num_hna++;
 112         atomic_set(&hna_local_changed, 1);
 113
 114         if (hna_local_hash->elements * 4 > hna_local_hash->size) {
 115                 swaphash = hash_resize(hna_local_hash,
 116                                        hna_local_hash->size * 2);
 117
 118                 if (swaphash == NULL)
 119                         pr_err("Couldn't resize local hna hash table\n");
 120                 else
 121                         hna_local_hash = swaphash;
 122         }
 123
 124         spin_unlock_irqrestore(&hna_local_hash_lock, flags);
 125
 126         /* remove address from global hash if present */
 127         spin_lock_irqsave(&hna_global_hash_lock, flags);
 128
 129         hna_global_entry =
 130                 ((struct hna_global_entry *)hash_find(hna_global_hash, addr));
 131
 132         if (hna_global_entry != NULL)
 133                 _hna_global_del_orig(hna_global_entry, "local hna received");
 134
 135         spin_unlock_irqrestore(&hna_global_hash_lock, flags);
 136 }
 137
 138 int hna_local_fill_buffer(unsigned char *buff, int buff_len)
 139 {
 140         struct hna_local_entry *hna_local_entry;
 141         HASHIT(hashit);
 142         int i = 0;
 143         unsigned long flags;
 144
 145         spin_lock_irqsave(&hna_local_hash_lock, flags);
 146
 147         while (hash_iterate(hna_local_hash, &hashit)) {
 148
 149                 if (buff_len < (i + 1) * ETH_ALEN)
 150                         break;
 151
 152                 hna_local_entry = hashit.bucket->data;
 153                 memcpy(buff + (i * ETH_ALEN), hna_local_entry->addr, ETH_ALEN);
 154
 155                 i++;
 156         }
 157
 158         /* if we did not get all new local hnas see you next time  ;-) */
 159         if (i == num_hna)
 160                 atomic_set(&hna_local_changed, 0);
 161
 162         spin_unlock_irqrestore(&hna_local_hash_lock, flags);
 163
 164         return i;
 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 hna_local_entry *hna_local_entry;
 172         HASHIT(hashit);
 173         HASHIT(hashit_count);
 174         unsigned long flags;
 175         size_t buf_size, pos;
 176         char *buff;
 177
 178         if (!bat_priv->primary_if) {
 179                 return seq_printf(seq, "BATMAN mesh %s disabled - "
 180                                "please specify interfaces to enable it\n",
 181                                net_dev->name);
 182         }
 183
 184         seq_printf(seq, "Locally retrieved addresses (from %s) "
 185                    "announced via HNA:\n",
 186                    net_dev->name);
 187
 188         spin_lock_irqsave(&hna_local_hash_lock, flags);
 189
 190         buf_size = 1;
 191         /* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
 192         while (hash_iterate(hna_local_hash, &hashit_count))
 193                 buf_size += 21;
 194
 195         buff = kmalloc(buf_size, GFP_ATOMIC);
 196         if (!buff) {
 197                 spin_unlock_irqrestore(&hna_local_hash_lock, flags);
 198                 return -ENOMEM;
 199         }
 200         buff[0] = '\0';
 201         pos = 0;
 202
 203         while (hash_iterate(hna_local_hash, &hashit)) {
 204                 hna_local_entry = hashit.bucket->data;
 205
 206                 pos += snprintf(buff + pos, 22, " * %pM\n",
 207                                 hna_local_entry->addr);
 208         }
 209
 210         spin_unlock_irqrestore(&hna_local_hash_lock, flags);
 211
 212         seq_printf(seq, "%s", buff);
 213         kfree(buff);
 214         return 0;
 215 }
 216
 217 static void _hna_local_del(void *data)
 218 {
 219         kfree(data);
 220         num_hna--;
 221         atomic_set(&hna_local_changed, 1);
 222 }
 223
 224 static void hna_local_del(struct hna_local_entry *hna_local_entry,
 225                           char *message)
 226 {
 227         /* FIXME: each orig_node->batman_if will be attached to a softif */
 228         struct bat_priv *bat_priv = netdev_priv(soft_device);
 229         bat_dbg(DBG_ROUTES, bat_priv, "Deleting local hna entry (%pM): %s\n",
 230                 hna_local_entry->addr, message);
 231
 232         hash_remove(hna_local_hash, hna_local_entry->addr);
 233         _hna_local_del(hna_local_entry);
 234 }
 235
 236 void hna_local_remove(uint8_t *addr, char *message)
 237 {
 238         struct hna_local_entry *hna_local_entry;
 239         unsigned long flags;
 240
 241         spin_lock_irqsave(&hna_local_hash_lock, flags);
 242
 243         hna_local_entry = (struct hna_local_entry *)
 244                 hash_find(hna_local_hash, addr);
 245         if (hna_local_entry)
 246                 hna_local_del(hna_local_entry, message);
 247
 248         spin_unlock_irqrestore(&hna_local_hash_lock, flags);
 249 }
 250
 251 static void hna_local_purge(struct work_struct *work)
 252 {
 253         struct hna_local_entry *hna_local_entry;
 254         HASHIT(hashit);
 255         unsigned long flags;
 256         unsigned long timeout;
 257
 258         spin_lock_irqsave(&hna_local_hash_lock, flags);
 259
 260         while (hash_iterate(hna_local_hash, &hashit)) {
 261                 hna_local_entry = hashit.bucket->data;
 262
 263                 timeout = hna_local_entry->last_seen + LOCAL_HNA_TIMEOUT * HZ;
 264                 if ((!hna_local_entry->never_purge) &&
 265                     time_after(jiffies, timeout))
 266                         hna_local_del(hna_local_entry, "address timed out");
 267         }
 268
 269         spin_unlock_irqrestore(&hna_local_hash_lock, flags);
 270         hna_local_start_timer();
 271 }
 272
 273 void hna_local_free(void)
 274 {
 275         if (!hna_local_hash)
 276                 return;
 277
 278         cancel_delayed_work_sync(&hna_local_purge_wq);
 279         hash_delete(hna_local_hash, _hna_local_del);
 280         hna_local_hash = NULL;
 281 }
 282
 283 int hna_global_init(void)
 284 {
 285         if (hna_global_hash)
 286                 return 1;
 287
 288         hna_global_hash = hash_new(128, compare_orig, choose_orig);
 289
 290         if (!hna_global_hash)
 291                 return 0;
 292
 293         return 1;
 294 }
 295
 296 void hna_global_add_orig(struct orig_node *orig_node,
 297                          unsigned char *hna_buff, int hna_buff_len)
 298 {
 299         /* FIXME: each orig_node->batman_if will be attached to a softif */
 300         struct bat_priv *bat_priv = netdev_priv(soft_device);
 301         struct hna_global_entry *hna_global_entry;
 302         struct hna_local_entry *hna_local_entry;
 303         struct hashtable_t *swaphash;
 304         int hna_buff_count = 0;
 305         unsigned long flags;
 306         unsigned char *hna_ptr;
 307
 308         while ((hna_buff_count + 1) * ETH_ALEN <= hna_buff_len) {
 309                 spin_lock_irqsave(&hna_global_hash_lock, flags);
 310
 311                 hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
 312                 hna_global_entry = (struct hna_global_entry *)
 313                         hash_find(hna_global_hash, hna_ptr);
 314
 315                 if (hna_global_entry == NULL) {
 316                         spin_unlock_irqrestore(&hna_global_hash_lock, flags);
 317
 318                         hna_global_entry =
 319                                 kmalloc(sizeof(struct hna_global_entry),
 320                                         GFP_ATOMIC);
 321
 322                         if (!hna_global_entry)
 323                                 break;
 324
 325                         memcpy(hna_global_entry->addr, hna_ptr, ETH_ALEN);
 326
 327                         bat_dbg(DBG_ROUTES, bat_priv,
 328                                 "Creating new global hna entry: "
 329                                 "%pM (via %pM)\n",
 330                                 hna_global_entry->addr, orig_node->orig);
 331
 332                         spin_lock_irqsave(&hna_global_hash_lock, flags);
 333                         hash_add(hna_global_hash, hna_global_entry);
 334
 335                 }
 336
 337                 hna_global_entry->orig_node = orig_node;
 338                 spin_unlock_irqrestore(&hna_global_hash_lock, flags);
 339
 340                 /* remove address from local hash if present */
 341                 spin_lock_irqsave(&hna_local_hash_lock, flags);
 342
 343                 hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
 344                 hna_local_entry = (struct hna_local_entry *)
 345                         hash_find(hna_local_hash, hna_ptr);
 346
 347                 if (hna_local_entry != NULL)
 348                         hna_local_del(hna_local_entry, "global hna received");
 349
 350                 spin_unlock_irqrestore(&hna_local_hash_lock, flags);
 351
 352                 hna_buff_count++;
 353         }
 354
 355         /* initialize, and overwrite if malloc succeeds */
 356         orig_node->hna_buff = NULL;
 357         orig_node->hna_buff_len = 0;
 358
 359         if (hna_buff_len > 0) {
 360                 orig_node->hna_buff = kmalloc(hna_buff_len, GFP_ATOMIC);
 361                 if (orig_node->hna_buff) {
 362                         memcpy(orig_node->hna_buff, hna_buff, hna_buff_len);
 363                         orig_node->hna_buff_len = hna_buff_len;
 364                 }
 365         }
 366
 367         spin_lock_irqsave(&hna_global_hash_lock, flags);
 368
 369         if (hna_global_hash->elements * 4 > hna_global_hash->size) {
 370                 swaphash = hash_resize(hna_global_hash,
 371                                        hna_global_hash->size * 2);
 372
 373                 if (swaphash == NULL)
 374                         pr_err("Couldn't resize global hna hash table\n");
 375                 else
 376                         hna_global_hash = swaphash;
 377         }
 378
 379         spin_unlock_irqrestore(&hna_global_hash_lock, flags);
 380 }
 381
 382 int hna_global_seq_print_text(struct seq_file *seq, void *offset)
 383 {
 384         struct net_device *net_dev = (struct net_device *)seq->private;
 385         struct bat_priv *bat_priv = netdev_priv(net_dev);
 386         struct hna_global_entry *hna_global_entry;
 387         HASHIT(hashit);
 388         HASHIT(hashit_count);
 389         unsigned long flags;
 390         size_t buf_size, pos;
 391         char *buff;
 392
 393         if (!bat_priv->primary_if) {
 394                 return seq_printf(seq, "BATMAN mesh %s disabled - "
 395                                   "please specify interfaces to enable it\n",
 396                                   net_dev->name);
 397         }
 398
 399         seq_printf(seq, "Globally announced HNAs received via the mesh %s\n",
 400                    net_dev->name);
 401
 402         spin_lock_irqsave(&hna_global_hash_lock, flags);
 403
 404         buf_size = 1;
 405         /* Estimate length for: " * xx:xx:xx:xx:xx:xx via xx:xx:xx:xx:xx:xx\n"*/
 406         while (hash_iterate(hna_global_hash, &hashit_count))
 407                 buf_size += 43;
 408
 409         buff = kmalloc(buf_size, GFP_ATOMIC);
 410         if (!buff) {
 411                 spin_unlock_irqrestore(&hna_global_hash_lock, flags);
 412                 return -ENOMEM;
 413         }
 414         buff[0] = '\0';
 415         pos = 0;
 416
 417         while (hash_iterate(hna_global_hash, &hashit)) {
 418                 hna_global_entry = hashit.bucket->data;
 419
 420                 pos += snprintf(buff + pos, 44,
 421                                 " * %pM via %pM\n", hna_global_entry->addr,
 422                                 hna_global_entry->orig_node->orig);
 423         }
 424
 425         spin_unlock_irqrestore(&hna_global_hash_lock, flags);
 426
 427         seq_printf(seq, "%s", buff);
 428         kfree(buff);
 429         return 0;
 430 }
 431
 432 static void _hna_global_del_orig(struct hna_global_entry *hna_global_entry,
 433                                  char *message)
 434 {
 435         /* FIXME: each orig_node->batman_if will be attached to a softif */
 436         struct bat_priv *bat_priv = netdev_priv(soft_device);
 437         bat_dbg(DBG_ROUTES, bat_priv,
 438                 "Deleting global hna entry %pM (via %pM): %s\n",
 439                 hna_global_entry->addr, hna_global_entry->orig_node->orig,
 440                 message);
 441
 442         hash_remove(hna_global_hash, hna_global_entry->addr);
 443         kfree(hna_global_entry);
 444 }
 445
 446 void hna_global_del_orig(struct orig_node *orig_node, char *message)
 447 {
 448         struct hna_global_entry *hna_global_entry;
 449         int hna_buff_count = 0;
 450         unsigned long flags;
 451         unsigned char *hna_ptr;
 452
 453         if (orig_node->hna_buff_len == 0)
 454                 return;
 455
 456         spin_lock_irqsave(&hna_global_hash_lock, flags);
 457
 458         while ((hna_buff_count + 1) * ETH_ALEN <= orig_node->hna_buff_len) {
 459                 hna_ptr = orig_node->hna_buff + (hna_buff_count * ETH_ALEN);
 460                 hna_global_entry = (struct hna_global_entry *)
 461                         hash_find(hna_global_hash, hna_ptr);
 462
 463                 if ((hna_global_entry != NULL) &&
 464                     (hna_global_entry->orig_node == orig_node))
 465                         _hna_global_del_orig(hna_global_entry, message);
 466
 467                 hna_buff_count++;
 468         }
 469
 470         spin_unlock_irqrestore(&hna_global_hash_lock, flags);
 471
 472         orig_node->hna_buff_len = 0;
 473         kfree(orig_node->hna_buff);
 474         orig_node->hna_buff = NULL;
 475 }
 476
 477 static void hna_global_del(void *data)
 478 {
 479         kfree(data);
 480 }
 481
 482 void hna_global_free(void)
 483 {
 484         if (!hna_global_hash)
 485                 return;
 486
 487         hash_delete(hna_global_hash, hna_global_del);
 488         hna_global_hash = NULL;
 489 }
 490
 491 struct orig_node *transtable_search(uint8_t *addr)
 492 {
 493         struct hna_global_entry *hna_global_entry;
 494         unsigned long flags;
 495
 496         spin_lock_irqsave(&hna_global_hash_lock, flags);
 497         hna_global_entry = (struct hna_global_entry *)
 498                 hash_find(hna_global_hash, addr);
 499         spin_unlock_irqrestore(&hna_global_hash_lock, flags);
 500
 501         if (hna_global_entry == NULL)
 502                 return NULL;
 503
 504         return hna_global_entry->orig_node;
 505 }