net/mac80211/mesh.c

   1 /*
   2  * Copyright (c) 2008 open80211s Ltd.
   3  * Authors:    Luis Carlos Cobo <luisca@cozybit.com>
   4  *             Javier Cardona <javier@cozybit.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <asm/unaligned.h>
  12 #include "ieee80211_i.h"
  13 #include "mesh.h"
  14
  15 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
  16 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
  17
  18 #define PP_OFFSET       1               /* Path Selection Protocol */
  19 #define PM_OFFSET       5               /* Path Selection Metric   */
  20 #define CC_OFFSET       9               /* Congestion Control Mode */
  21 #define CAPAB_OFFSET 17
  22 #define ACCEPT_PLINKS 0x80
  23
  24 #define TMR_RUNNING_HK  0
  25 #define TMR_RUNNING_MP  1
  26
  27 int mesh_allocated;
  28 static struct kmem_cache *rm_cache;
  29
  30 void ieee80211s_init(void)
  31 {
  32         mesh_pathtbl_init();
  33         mesh_allocated = 1;
  34         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  35                                      0, 0, NULL);
  36 }
  37
  38 void ieee80211s_stop(void)
  39 {
  40         mesh_pathtbl_unregister();
  41         kmem_cache_destroy(rm_cache);
  42 }
  43
  44 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  45 {
  46         struct ieee80211_sub_if_data *sdata = (void *) data;
  47         struct ieee80211_local *local = sdata->local;
  48         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  49
  50         ifmsh->housekeeping = true;
  51
  52         if (local->quiescing) {
  53                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
  54                 return;
  55         }
  56
  57         ieee80211_queue_work(&local->hw, &ifmsh->work);
  58 }
  59
  60 /**
  61  * mesh_matches_local - check if the config of a mesh point matches ours
  62  *
  63  * @ie: information elements of a management frame from the mesh peer
  64  * @sdata: local mesh subif
  65  *
  66  * This function checks if the mesh configuration of a mesh point matches the
  67  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  68  */
  69 bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
  70 {
  71         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  72
  73         /*
  74          * As support for each feature is added, check for matching
  75          * - On mesh config capabilities
  76          *   - Power Save Support En
  77          *   - Sync support enabled
  78          *   - Sync support active
  79          *   - Sync support required from peer
  80          *   - MDA enabled
  81          * - Power management control on fc
  82          */
  83         if (ifmsh->mesh_id_len == ie->mesh_id_len &&
  84                 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  85                 memcmp(ifmsh->mesh_pp_id, ie->mesh_config + PP_OFFSET, 4) == 0 &&
  86                 memcmp(ifmsh->mesh_pm_id, ie->mesh_config + PM_OFFSET, 4) == 0 &&
  87                 memcmp(ifmsh->mesh_cc_id, ie->mesh_config + CC_OFFSET, 4) == 0)
  88                 return true;
  89
  90         return false;
  91 }
  92
  93 /**
  94  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
  95  *
  96  * @ie: information elements of a management frame from the mesh peer
  97  */
  98 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
  99 {
 100         return (*(ie->mesh_config + CAPAB_OFFSET) & ACCEPT_PLINKS) != 0;
 101 }
 102
 103 /**
 104  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
 105  *
 106  * @sdata: mesh interface in which mesh beacons are going to be updated
 107  */
 108 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 109 {
 110         bool free_plinks;
 111
 112         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 113          * the mesh interface might be able to establish plinks with peers that
 114          * are already on the table but are not on PLINK_ESTAB state. However,
 115          * in general the mesh interface is not accepting peer link requests
 116          * from new peers, and that must be reflected in the beacon
 117          */
 118         free_plinks = mesh_plink_availables(sdata);
 119
 120         if (free_plinks != sdata->u.mesh.accepting_plinks)
 121                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
 122 }
 123
 124 void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
 125 {
 126         u8 def_id[4] = {0x00, 0x0F, 0xAC, 0xff};
 127
 128         memcpy(sta->mesh_pp_id, def_id, 4);
 129         memcpy(sta->mesh_pm_id, def_id, 4);
 130         memcpy(sta->mesh_cc_id, def_id, 4);
 131 }
 132
 133 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 134 {
 135         int i;
 136
 137         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 138         if (!sdata->u.mesh.rmc)
 139                 return -ENOMEM;
 140         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 141         for (i = 0; i < RMC_BUCKETS; i++)
 142                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
 143         return 0;
 144 }
 145
 146 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 147 {
 148         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 149         struct rmc_entry *p, *n;
 150         int i;
 151
 152         if (!sdata->u.mesh.rmc)
 153                 return;
 154
 155         for (i = 0; i < RMC_BUCKETS; i++)
 156                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
 157                         list_del(&p->list);
 158                         kmem_cache_free(rm_cache, p);
 159                 }
 160
 161         kfree(rmc);
 162         sdata->u.mesh.rmc = NULL;
 163 }
 164
 165 /**
 166  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 167  *
 168  * @sa:         source address
 169  * @mesh_hdr:   mesh_header
 170  *
 171  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 172  *
 173  * Checks using the source address and the mesh sequence number if we have
 174  * received this frame lately. If the frame is not in the cache, it is added to
 175  * it.
 176  */
 177 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 178                    struct ieee80211_sub_if_data *sdata)
 179 {
 180         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 181         u32 seqnum = 0;
 182         int entries = 0;
 183         u8 idx;
 184         struct rmc_entry *p, *n;
 185
 186         /* Don't care about endianness since only match matters */
 187         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 188         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 189         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
 190                 ++entries;
 191                 if (time_after(jiffies, p->exp_time) ||
 192                                 (entries == RMC_QUEUE_MAX_LEN)) {
 193                         list_del(&p->list);
 194                         kmem_cache_free(rm_cache, p);
 195                         --entries;
 196                 } else if ((seqnum == p->seqnum)
 197                                 && (memcmp(sa, p->sa, ETH_ALEN) == 0))
 198                         return -1;
 199         }
 200
 201         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 202         if (!p) {
 203                 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
 204                 return 0;
 205         }
 206         p->seqnum = seqnum;
 207         p->exp_time = jiffies + RMC_TIMEOUT;
 208         memcpy(p->sa, sa, ETH_ALEN);
 209         list_add(&p->list, &rmc->bucket[idx].list);
 210         return 0;
 211 }
 212
 213 void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 214 {
 215         struct ieee80211_local *local = sdata->local;
 216         struct ieee80211_supported_band *sband;
 217         u8 *pos;
 218         int len, i, rate;
 219
 220         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 221         len = sband->n_bitrates;
 222         if (len > 8)
 223                 len = 8;
 224         pos = skb_put(skb, len + 2);
 225         *pos++ = WLAN_EID_SUPP_RATES;
 226         *pos++ = len;
 227         for (i = 0; i < len; i++) {
 228                 rate = sband->bitrates[i].bitrate;
 229                 *pos++ = (u8) (rate / 5);
 230         }
 231
 232         if (sband->n_bitrates > len) {
 233                 pos = skb_put(skb, sband->n_bitrates - len + 2);
 234                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 235                 *pos++ = sband->n_bitrates - len;
 236                 for (i = len; i < sband->n_bitrates; i++) {
 237                         rate = sband->bitrates[i].bitrate;
 238                         *pos++ = (u8) (rate / 5);
 239                 }
 240         }
 241
 242         pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
 243         *pos++ = WLAN_EID_MESH_ID;
 244         *pos++ = sdata->u.mesh.mesh_id_len;
 245         if (sdata->u.mesh.mesh_id_len)
 246                 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
 247
 248         pos = skb_put(skb, 21);
 249         *pos++ = WLAN_EID_MESH_CONFIG;
 250         *pos++ = IEEE80211_MESH_CONFIG_LEN;
 251         /* Version */
 252         *pos++ = 1;
 253
 254         /* Active path selection protocol ID */
 255         memcpy(pos, sdata->u.mesh.mesh_pp_id, 4);
 256         pos += 4;
 257
 258         /* Active path selection metric ID   */
 259         memcpy(pos, sdata->u.mesh.mesh_pm_id, 4);
 260         pos += 4;
 261
 262         /* Congestion control mode identifier */
 263         memcpy(pos, sdata->u.mesh.mesh_cc_id, 4);
 264         pos += 4;
 265
 266         /* Channel precedence:
 267          * Not running simple channel unification protocol
 268          */
 269         memset(pos, 0x00, 4);
 270         pos += 4;
 271
 272         /* Mesh capability */
 273         sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
 274         *pos++ = sdata->u.mesh.accepting_plinks ? ACCEPT_PLINKS : 0x00;
 275         *pos++ = 0x00;
 276
 277         return;
 278 }
 279
 280 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
 281 {
 282         /* Use last four bytes of hw addr and interface index as hash index */
 283         return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
 284                 & tbl->hash_mask;
 285 }
 286
 287 struct mesh_table *mesh_table_alloc(int size_order)
 288 {
 289         int i;
 290         struct mesh_table *newtbl;
 291
 292         newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
 293         if (!newtbl)
 294                 return NULL;
 295
 296         newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
 297                         (1 << size_order), GFP_KERNEL);
 298
 299         if (!newtbl->hash_buckets) {
 300                 kfree(newtbl);
 301                 return NULL;
 302         }
 303
 304         newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
 305                         (1 << size_order), GFP_KERNEL);
 306         if (!newtbl->hashwlock) {
 307                 kfree(newtbl->hash_buckets);
 308                 kfree(newtbl);
 309                 return NULL;
 310         }
 311
 312         newtbl->size_order = size_order;
 313         newtbl->hash_mask = (1 << size_order) - 1;
 314         atomic_set(&newtbl->entries,  0);
 315         get_random_bytes(&newtbl->hash_rnd,
 316                         sizeof(newtbl->hash_rnd));
 317         for (i = 0; i <= newtbl->hash_mask; i++)
 318                 spin_lock_init(&newtbl->hashwlock[i]);
 319
 320         return newtbl;
 321 }
 322
 323 static void __mesh_table_free(struct mesh_table *tbl)
 324 {
 325         kfree(tbl->hash_buckets);
 326         kfree(tbl->hashwlock);
 327         kfree(tbl);
 328 }
 329
 330 void mesh_table_free(struct mesh_table *tbl, bool free_leafs)
 331 {
 332         struct hlist_head *mesh_hash;
 333         struct hlist_node *p, *q;
 334         int i;
 335
 336         mesh_hash = tbl->hash_buckets;
 337         for (i = 0; i <= tbl->hash_mask; i++) {
 338                 spin_lock(&tbl->hashwlock[i]);
 339                 hlist_for_each_safe(p, q, &mesh_hash[i]) {
 340                         tbl->free_node(p, free_leafs);
 341                         atomic_dec(&tbl->entries);
 342                 }
 343                 spin_unlock(&tbl->hashwlock[i]);
 344         }
 345         __mesh_table_free(tbl);
 346 }
 347
 348 static void ieee80211_mesh_path_timer(unsigned long data)
 349 {
 350         struct ieee80211_sub_if_data *sdata =
 351                 (struct ieee80211_sub_if_data *) data;
 352         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 353         struct ieee80211_local *local = sdata->local;
 354
 355         if (local->quiescing) {
 356                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 357                 return;
 358         }
 359
 360         ieee80211_queue_work(&local->hw, &ifmsh->work);
 361 }
 362
 363 struct mesh_table *mesh_table_grow(struct mesh_table *tbl)
 364 {
 365         struct mesh_table *newtbl;
 366         struct hlist_head *oldhash;
 367         struct hlist_node *p, *q;
 368         int i;
 369
 370         if (atomic_read(&tbl->entries)
 371                         < tbl->mean_chain_len * (tbl->hash_mask + 1))
 372                 goto endgrow;
 373
 374         newtbl = mesh_table_alloc(tbl->size_order + 1);
 375         if (!newtbl)
 376                 goto endgrow;
 377
 378         newtbl->free_node = tbl->free_node;
 379         newtbl->mean_chain_len = tbl->mean_chain_len;
 380         newtbl->copy_node = tbl->copy_node;
 381         atomic_set(&newtbl->entries, atomic_read(&tbl->entries));
 382
 383         oldhash = tbl->hash_buckets;
 384         for (i = 0; i <= tbl->hash_mask; i++)
 385                 hlist_for_each(p, &oldhash[i])
 386                         if (tbl->copy_node(p, newtbl) < 0)
 387                                 goto errcopy;
 388
 389         return newtbl;
 390
 391 errcopy:
 392         for (i = 0; i <= newtbl->hash_mask; i++) {
 393                 hlist_for_each_safe(p, q, &newtbl->hash_buckets[i])
 394                         tbl->free_node(p, 0);
 395         }
 396         __mesh_table_free(newtbl);
 397 endgrow:
 398         return NULL;
 399 }
 400
 401 /**
 402  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 403  * @hdr:        802.11 frame header
 404  * @fc:         frame control field
 405  * @meshda:     destination address in the mesh
 406  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 407  *              locally originated.
 408  *
 409  * Return the length of the 802.11 (does not include a mesh control header)
 410  */
 411 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, char
 412                 *meshda, char *meshsa) {
 413         if (is_multicast_ether_addr(meshda)) {
 414                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 415                 /* DA TA SA */
 416                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 417                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 418                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 419                 return 24;
 420         } else {
 421                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
 422                                 IEEE80211_FCTL_TODS);
 423                 /* RA TA DA SA */
 424                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 425                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 426                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 427                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 428                 return 30;
 429         }
 430 }
 431
 432 /**
 433  * ieee80211_new_mesh_header - create a new mesh header
 434  * @meshhdr:    uninitialized mesh header
 435  * @sdata:      mesh interface to be used
 436  * @addr4:      addr4 of the mesh frame (1st in ae header)
 437  *              may be NULL
 438  * @addr5:      addr5 of the mesh frame (1st or 2nd in ae header)
 439  *              may be NULL unless addr6 is present
 440  * @addr6:      addr6 of the mesh frame (2nd or 3rd in ae header)
 441  *              may be NULL unless addr5 is present
 442  *
 443  * Return the header length.
 444  */
 445 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 446                 struct ieee80211_sub_if_data *sdata, char *addr4,
 447                 char *addr5, char *addr6)
 448 {
 449         int aelen = 0;
 450         memset(meshhdr, 0, sizeof(meshhdr));
 451         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 452         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 453         sdata->u.mesh.mesh_seqnum++;
 454         if (addr4) {
 455                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 456                 aelen += ETH_ALEN;
 457                 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
 458         }
 459         if (addr5 && addr6) {
 460                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 461                 aelen += 2 * ETH_ALEN;
 462                 if (!addr4) {
 463                         memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
 464                         memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 465                 } else {
 466                         memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
 467                         memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
 468                 }
 469         }
 470         return 6 + aelen;
 471 }
 472
 473 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 474                            struct ieee80211_if_mesh *ifmsh)
 475 {
 476         bool free_plinks;
 477
 478 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 479         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 480                sdata->dev->name);
 481 #endif
 482
 483         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 484         mesh_path_expire(sdata);
 485
 486         free_plinks = mesh_plink_availables(sdata);
 487         if (free_plinks != sdata->u.mesh.accepting_plinks)
 488                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 489
 490         ifmsh->housekeeping = false;
 491         mod_timer(&ifmsh->housekeeping_timer,
 492                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 493 }
 494
 495 #ifdef CONFIG_PM
 496 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 497 {
 498         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 499
 500         /* might restart the timer but that doesn't matter */
 501         cancel_work_sync(&ifmsh->work);
 502
 503         /* use atomic bitops in case both timers fire at the same time */
 504
 505         if (del_timer_sync(&ifmsh->housekeeping_timer))
 506                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 507         if (del_timer_sync(&ifmsh->mesh_path_timer))
 508                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 509 }
 510
 511 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 512 {
 513         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 514
 515         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 516                 add_timer(&ifmsh->housekeeping_timer);
 517         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 518                 add_timer(&ifmsh->mesh_path_timer);
 519 }
 520 #endif
 521
 522 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 523 {
 524         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 525         struct ieee80211_local *local = sdata->local;
 526
 527         ifmsh->housekeeping = true;
 528         queue_work(local->hw, &ifmsh->work);
 529         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 530         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 531                                                 BSS_CHANGED_BEACON_ENABLED |
 532                                                 BSS_CHANGED_BEACON_INT);
 533 }
 534
 535 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 536 {
 537         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 538         /*
 539          * If the timer fired while we waited for it, it will have
 540          * requeued the work. Now the work will be running again
 541          * but will not rearm the timer again because it checks
 542          * whether the interface is running, which, at this point,
 543          * it no longer is.
 544          */
 545         cancel_work_sync(&sdata->u.mesh.work);
 546
 547         /*
 548          * When we get here, the interface is marked down.
 549          * Call synchronize_rcu() to wait for the RX path
 550          * should it be using the interface and enqueuing
 551          * frames at this very time on another CPU.
 552          */
 553         rcu_barrier(); /* Wait for RX path and call_rcu()'s */
 554         skb_queue_purge(&sdata->u.mesh.skb_queue);
 555 }
 556
 557 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 558                                         u16 stype,
 559                                         struct ieee80211_mgmt *mgmt,
 560                                         size_t len,
 561                                         struct ieee80211_rx_status *rx_status)
 562 {
 563         struct ieee80211_local *local = sdata->local;
 564         struct ieee802_11_elems elems;
 565         struct ieee80211_channel *channel;
 566         u32 supp_rates = 0;
 567         size_t baselen;
 568         int freq;
 569         enum ieee80211_band band = rx_status->band;
 570
 571         /* ignore ProbeResp to foreign address */
 572         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 573             compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
 574                 return;
 575
 576         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 577         if (baselen > len)
 578                 return;
 579
 580         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 581                                &elems);
 582
 583         if (elems.ds_params && elems.ds_params_len == 1)
 584                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
 585         else
 586                 freq = rx_status->freq;
 587
 588         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 589
 590         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 591                 return;
 592
 593         if (elems.mesh_id && elems.mesh_config &&
 594             mesh_matches_local(&elems, sdata)) {
 595                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
 596
 597                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
 598                                       mesh_peer_accepts_plinks(&elems));
 599         }
 600 }
 601
 602 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 603                                           struct ieee80211_mgmt *mgmt,
 604                                           size_t len,
 605                                           struct ieee80211_rx_status *rx_status)
 606 {
 607         switch (mgmt->u.action.category) {
 608         case PLINK_CATEGORY:
 609                 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 610                 break;
 611         case MESH_PATH_SEL_CATEGORY:
 612                 mesh_rx_path_sel_frame(sdata, mgmt, len);
 613                 break;
 614         }
 615 }
 616
 617 static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 618                                           struct sk_buff *skb)
 619 {
 620         struct ieee80211_rx_status *rx_status;
 621         struct ieee80211_if_mesh *ifmsh;
 622         struct ieee80211_mgmt *mgmt;
 623         u16 stype;
 624
 625         ifmsh = &sdata->u.mesh;
 626
 627         rx_status = IEEE80211_SKB_RXCB(skb);
 628         mgmt = (struct ieee80211_mgmt *) skb->data;
 629         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 630
 631         switch (stype) {
 632         case IEEE80211_STYPE_PROBE_RESP:
 633         case IEEE80211_STYPE_BEACON:
 634                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 635                                             rx_status);
 636                 break;
 637         case IEEE80211_STYPE_ACTION:
 638                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 639                 break;
 640         }
 641
 642         kfree_skb(skb);
 643 }
 644
 645 static void ieee80211_mesh_work(struct work_struct *work)
 646 {
 647         struct ieee80211_sub_if_data *sdata =
 648                 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
 649         struct ieee80211_local *local = sdata->local;
 650         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 651         struct sk_buff *skb;
 652
 653         if (!netif_running(sdata->dev))
 654                 return;
 655
 656         if (local->scanning)
 657                 return;
 658
 659         while ((skb = skb_dequeue(&ifmsh->skb_queue)))
 660                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 661
 662         if (ifmsh->preq_queue_len &&
 663             time_after(jiffies,
 664                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 665                 mesh_path_start_discovery(sdata);
 666
 667         if (ifmsh->housekeeping)
 668                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 669 }
 670
 671 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 672 {
 673         struct ieee80211_sub_if_data *sdata;
 674
 675         rcu_read_lock();
 676         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 677                 if (ieee80211_vif_is_mesh(&sdata->vif))
 678                         ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
 679         rcu_read_unlock();
 680 }
 681
 682 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 683 {
 684         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 685
 686         INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
 687         setup_timer(&ifmsh->housekeeping_timer,
 688                     ieee80211_mesh_housekeeping_timer,
 689                     (unsigned long) sdata);
 690         skb_queue_head_init(&sdata->u.mesh.skb_queue);
 691
 692         ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
 693         ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
 694         ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
 695         ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
 696         ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
 697         ifmsh->mshcfg.auto_open_plinks = true;
 698         ifmsh->mshcfg.dot11MeshMaxPeerLinks =
 699                 MESH_MAX_ESTAB_PLINKS;
 700         ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
 701                 MESH_PATH_TIMEOUT;
 702         ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
 703                 MESH_PREQ_MIN_INT;
 704         ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
 705                 MESH_DIAM_TRAVERSAL_TIME;
 706         ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
 707                 MESH_MAX_PREQ_RETRIES;
 708         ifmsh->mshcfg.path_refresh_time =
 709                 MESH_PATH_REFRESH_TIME;
 710         ifmsh->mshcfg.min_discovery_timeout =
 711                 MESH_MIN_DISCOVERY_TIMEOUT;
 712         ifmsh->accepting_plinks = true;
 713         ifmsh->preq_id = 0;
 714         ifmsh->dsn = 0;
 715         atomic_set(&ifmsh->mpaths, 0);
 716         mesh_rmc_init(sdata);
 717         ifmsh->last_preq = jiffies;
 718         /* Allocate all mesh structures when creating the first mesh interface. */
 719         if (!mesh_allocated)
 720                 ieee80211s_init();
 721         mesh_ids_set_default(ifmsh);
 722         setup_timer(&ifmsh->mesh_path_timer,
 723                     ieee80211_mesh_path_timer,
 724                     (unsigned long) sdata);
 725         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 726         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 727 }
 728
 729 ieee80211_rx_result
 730 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 731 {
 732         struct ieee80211_local *local = sdata->local;
 733         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 734         struct ieee80211_mgmt *mgmt;
 735         u16 fc;
 736
 737         if (skb->len < 24)
 738                 return RX_DROP_MONITOR;
 739
 740         mgmt = (struct ieee80211_mgmt *) skb->data;
 741         fc = le16_to_cpu(mgmt->frame_control);
 742
 743         switch (fc & IEEE80211_FCTL_STYPE) {
 744         case IEEE80211_STYPE_ACTION:
 745                 if (skb->len < IEEE80211_MIN_ACTION_SIZE)
 746                         return RX_DROP_MONITOR;
 747                 /* fall through */
 748         case IEEE80211_STYPE_PROBE_RESP:
 749         case IEEE80211_STYPE_BEACON:
 750                 skb_queue_tail(&ifmsh->skb_queue, skb);
 751                 ieee80211_queue_work(&local->hw, &ifmsh->work);
 752                 return RX_QUEUED;
 753         }
 754
 755         return RX_CONTINUE;
 756 }