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 int mesh_allocated;
  25 static struct kmem_cache *rm_cache;
  26
  27 void ieee80211s_init(void)
  28 {
  29         mesh_pathtbl_init();
  30         mesh_allocated = 1;
  31         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  32                                      0, 0, NULL);
  33 }
  34
  35 void ieee80211s_stop(void)
  36 {
  37         mesh_pathtbl_unregister();
  38         kmem_cache_destroy(rm_cache);
  39 }
  40
  41 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  42 {
  43         struct ieee80211_sub_if_data *sdata = (void *) data;
  44         struct ieee80211_local *local = sdata->local;
  45         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  46
  47         ifmsh->housekeeping = true;
  48         queue_work(local->hw.workqueue, &ifmsh->work);
  49 }
  50
  51 /**
  52  * mesh_matches_local - check if the config of a mesh point matches ours
  53  *
  54  * @ie: information elements of a management frame from the mesh peer
  55  * @sdata: local mesh subif
  56  *
  57  * This function checks if the mesh configuration of a mesh point matches the
  58  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  59  */
  60 bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
  61 {
  62         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  63
  64         /*
  65          * As support for each feature is added, check for matching
  66          * - On mesh config capabilities
  67          *   - Power Save Support En
  68          *   - Sync support enabled
  69          *   - Sync support active
  70          *   - Sync support required from peer
  71          *   - MDA enabled
  72          * - Power management control on fc
  73          */
  74         if (ifmsh->mesh_id_len == ie->mesh_id_len &&
  75                 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  76                 memcmp(ifmsh->mesh_pp_id, ie->mesh_config + PP_OFFSET, 4) == 0 &&
  77                 memcmp(ifmsh->mesh_pm_id, ie->mesh_config + PM_OFFSET, 4) == 0 &&
  78                 memcmp(ifmsh->mesh_cc_id, ie->mesh_config + CC_OFFSET, 4) == 0)
  79                 return true;
  80
  81         return false;
  82 }
  83
  84 /**
  85  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
  86  *
  87  * @ie: information elements of a management frame from the mesh peer
  88  */
  89 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
  90 {
  91         return (*(ie->mesh_config + CAPAB_OFFSET) & ACCEPT_PLINKS) != 0;
  92 }
  93
  94 /**
  95  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
  96  *
  97  * @sdata: mesh interface in which mesh beacons are going to be updated
  98  */
  99 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 100 {
 101         bool free_plinks;
 102
 103         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 104          * the mesh interface might be able to establish plinks with peers that
 105          * are already on the table but are not on PLINK_ESTAB state. However,
 106          * in general the mesh interface is not accepting peer link requests
 107          * from new peers, and that must be reflected in the beacon
 108          */
 109         free_plinks = mesh_plink_availables(sdata);
 110
 111         if (free_plinks != sdata->u.mesh.accepting_plinks)
 112                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
 113 }
 114
 115 void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
 116 {
 117         u8 def_id[4] = {0x00, 0x0F, 0xAC, 0xff};
 118
 119         memcpy(sta->mesh_pp_id, def_id, 4);
 120         memcpy(sta->mesh_pm_id, def_id, 4);
 121         memcpy(sta->mesh_cc_id, def_id, 4);
 122 }
 123
 124 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 125 {
 126         int i;
 127
 128         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 129         if (!sdata->u.mesh.rmc)
 130                 return -ENOMEM;
 131         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 132         for (i = 0; i < RMC_BUCKETS; i++)
 133                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
 134         return 0;
 135 }
 136
 137 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 138 {
 139         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 140         struct rmc_entry *p, *n;
 141         int i;
 142
 143         if (!sdata->u.mesh.rmc)
 144                 return;
 145
 146         for (i = 0; i < RMC_BUCKETS; i++)
 147                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
 148                         list_del(&p->list);
 149                         kmem_cache_free(rm_cache, p);
 150                 }
 151
 152         kfree(rmc);
 153         sdata->u.mesh.rmc = NULL;
 154 }
 155
 156 /**
 157  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 158  *
 159  * @sa:         source address
 160  * @mesh_hdr:   mesh_header
 161  *
 162  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 163  *
 164  * Checks using the source address and the mesh sequence number if we have
 165  * received this frame lately. If the frame is not in the cache, it is added to
 166  * it.
 167  */
 168 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 169                    struct ieee80211_sub_if_data *sdata)
 170 {
 171         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 172         u32 seqnum = 0;
 173         int entries = 0;
 174         u8 idx;
 175         struct rmc_entry *p, *n;
 176
 177         /* Don't care about endianness since only match matters */
 178         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 179         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 180         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
 181                 ++entries;
 182                 if (time_after(jiffies, p->exp_time) ||
 183                                 (entries == RMC_QUEUE_MAX_LEN)) {
 184                         list_del(&p->list);
 185                         kmem_cache_free(rm_cache, p);
 186                         --entries;
 187                 } else if ((seqnum == p->seqnum)
 188                                 && (memcmp(sa, p->sa, ETH_ALEN) == 0))
 189                         return -1;
 190         }
 191
 192         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 193         if (!p) {
 194                 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
 195                 return 0;
 196         }
 197         p->seqnum = seqnum;
 198         p->exp_time = jiffies + RMC_TIMEOUT;
 199         memcpy(p->sa, sa, ETH_ALEN);
 200         list_add(&p->list, &rmc->bucket[idx].list);
 201         return 0;
 202 }
 203
 204 void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 205 {
 206         struct ieee80211_local *local = sdata->local;
 207         struct ieee80211_supported_band *sband;
 208         u8 *pos;
 209         int len, i, rate;
 210
 211         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 212         len = sband->n_bitrates;
 213         if (len > 8)
 214                 len = 8;
 215         pos = skb_put(skb, len + 2);
 216         *pos++ = WLAN_EID_SUPP_RATES;
 217         *pos++ = len;
 218         for (i = 0; i < len; i++) {
 219                 rate = sband->bitrates[i].bitrate;
 220                 *pos++ = (u8) (rate / 5);
 221         }
 222
 223         if (sband->n_bitrates > len) {
 224                 pos = skb_put(skb, sband->n_bitrates - len + 2);
 225                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 226                 *pos++ = sband->n_bitrates - len;
 227                 for (i = len; i < sband->n_bitrates; i++) {
 228                         rate = sband->bitrates[i].bitrate;
 229                         *pos++ = (u8) (rate / 5);
 230                 }
 231         }
 232
 233         pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
 234         *pos++ = WLAN_EID_MESH_ID;
 235         *pos++ = sdata->u.mesh.mesh_id_len;
 236         if (sdata->u.mesh.mesh_id_len)
 237                 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
 238
 239         pos = skb_put(skb, 21);
 240         *pos++ = WLAN_EID_MESH_CONFIG;
 241         *pos++ = IEEE80211_MESH_CONFIG_LEN;
 242         /* Version */
 243         *pos++ = 1;
 244
 245         /* Active path selection protocol ID */
 246         memcpy(pos, sdata->u.mesh.mesh_pp_id, 4);
 247         pos += 4;
 248
 249         /* Active path selection metric ID   */
 250         memcpy(pos, sdata->u.mesh.mesh_pm_id, 4);
 251         pos += 4;
 252
 253         /* Congestion control mode identifier */
 254         memcpy(pos, sdata->u.mesh.mesh_cc_id, 4);
 255         pos += 4;
 256
 257         /* Channel precedence:
 258          * Not running simple channel unification protocol
 259          */
 260         memset(pos, 0x00, 4);
 261         pos += 4;
 262
 263         /* Mesh capability */
 264         sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
 265         *pos++ = sdata->u.mesh.accepting_plinks ? ACCEPT_PLINKS : 0x00;
 266         *pos++ = 0x00;
 267
 268         return;
 269 }
 270
 271 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
 272 {
 273         /* Use last four bytes of hw addr and interface index as hash index */
 274         return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
 275                 & tbl->hash_mask;
 276 }
 277
 278 struct mesh_table *mesh_table_alloc(int size_order)
 279 {
 280         int i;
 281         struct mesh_table *newtbl;
 282
 283         newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
 284         if (!newtbl)
 285                 return NULL;
 286
 287         newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
 288                         (1 << size_order), GFP_KERNEL);
 289
 290         if (!newtbl->hash_buckets) {
 291                 kfree(newtbl);
 292                 return NULL;
 293         }
 294
 295         newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
 296                         (1 << size_order), GFP_KERNEL);
 297         if (!newtbl->hashwlock) {
 298                 kfree(newtbl->hash_buckets);
 299                 kfree(newtbl);
 300                 return NULL;
 301         }
 302
 303         newtbl->size_order = size_order;
 304         newtbl->hash_mask = (1 << size_order) - 1;
 305         atomic_set(&newtbl->entries,  0);
 306         get_random_bytes(&newtbl->hash_rnd,
 307                         sizeof(newtbl->hash_rnd));
 308         for (i = 0; i <= newtbl->hash_mask; i++)
 309                 spin_lock_init(&newtbl->hashwlock[i]);
 310
 311         return newtbl;
 312 }
 313
 314 static void __mesh_table_free(struct mesh_table *tbl)
 315 {
 316         kfree(tbl->hash_buckets);
 317         kfree(tbl->hashwlock);
 318         kfree(tbl);
 319 }
 320
 321 void mesh_table_free(struct mesh_table *tbl, bool free_leafs)
 322 {
 323         struct hlist_head *mesh_hash;
 324         struct hlist_node *p, *q;
 325         int i;
 326
 327         mesh_hash = tbl->hash_buckets;
 328         for (i = 0; i <= tbl->hash_mask; i++) {
 329                 spin_lock(&tbl->hashwlock[i]);
 330                 hlist_for_each_safe(p, q, &mesh_hash[i]) {
 331                         tbl->free_node(p, free_leafs);
 332                         atomic_dec(&tbl->entries);
 333                 }
 334                 spin_unlock(&tbl->hashwlock[i]);
 335         }
 336         __mesh_table_free(tbl);
 337 }
 338
 339 static void ieee80211_mesh_path_timer(unsigned long data)
 340 {
 341         struct ieee80211_sub_if_data *sdata =
 342                 (struct ieee80211_sub_if_data *) data;
 343         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 344         struct ieee80211_local *local = sdata->local;
 345
 346         queue_work(local->hw.workqueue, &ifmsh->work);
 347 }
 348
 349 struct mesh_table *mesh_table_grow(struct mesh_table *tbl)
 350 {
 351         struct mesh_table *newtbl;
 352         struct hlist_head *oldhash;
 353         struct hlist_node *p, *q;
 354         int i;
 355
 356         if (atomic_read(&tbl->entries)
 357                         < tbl->mean_chain_len * (tbl->hash_mask + 1))
 358                 goto endgrow;
 359
 360         newtbl = mesh_table_alloc(tbl->size_order + 1);
 361         if (!newtbl)
 362                 goto endgrow;
 363
 364         newtbl->free_node = tbl->free_node;
 365         newtbl->mean_chain_len = tbl->mean_chain_len;
 366         newtbl->copy_node = tbl->copy_node;
 367         atomic_set(&newtbl->entries, atomic_read(&tbl->entries));
 368
 369         oldhash = tbl->hash_buckets;
 370         for (i = 0; i <= tbl->hash_mask; i++)
 371                 hlist_for_each(p, &oldhash[i])
 372                         if (tbl->copy_node(p, newtbl) < 0)
 373                                 goto errcopy;
 374
 375         return newtbl;
 376
 377 errcopy:
 378         for (i = 0; i <= newtbl->hash_mask; i++) {
 379                 hlist_for_each_safe(p, q, &newtbl->hash_buckets[i])
 380                         tbl->free_node(p, 0);
 381         }
 382         __mesh_table_free(newtbl);
 383 endgrow:
 384         return NULL;
 385 }
 386
 387 /**
 388  * ieee80211_new_mesh_header - create a new mesh header
 389  * @meshhdr:    uninitialized mesh header
 390  * @sdata:      mesh interface to be used
 391  *
 392  * Return the header length.
 393  */
 394 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 395                 struct ieee80211_sub_if_data *sdata)
 396 {
 397         meshhdr->flags = 0;
 398         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 399         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 400         sdata->u.mesh.mesh_seqnum++;
 401
 402         return 6;
 403 }
 404
 405 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 406                            struct ieee80211_if_mesh *ifmsh)
 407 {
 408         bool free_plinks;
 409
 410 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 411         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 412                sdata->dev->name);
 413 #endif
 414
 415         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 416         mesh_path_expire(sdata);
 417
 418         free_plinks = mesh_plink_availables(sdata);
 419         if (free_plinks != sdata->u.mesh.accepting_plinks)
 420                 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
 421
 422         ifmsh->housekeeping = false;
 423         mod_timer(&ifmsh->housekeeping_timer,
 424                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 425 }
 426
 427
 428 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 429 {
 430         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 431         struct ieee80211_local *local = sdata->local;
 432
 433         ifmsh->housekeeping = true;
 434         queue_work(local->hw.workqueue, &ifmsh->work);
 435         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
 436                                    IEEE80211_IFCC_BEACON_ENABLED);
 437 }
 438
 439 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 440 {
 441         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 442         /*
 443          * If the timer fired while we waited for it, it will have
 444          * requeued the work. Now the work will be running again
 445          * but will not rearm the timer again because it checks
 446          * whether the interface is running, which, at this point,
 447          * it no longer is.
 448          */
 449         cancel_work_sync(&sdata->u.mesh.work);
 450
 451         /*
 452          * When we get here, the interface is marked down.
 453          * Call synchronize_rcu() to wait for the RX path
 454          * should it be using the interface and enqueuing
 455          * frames at this very time on another CPU.
 456          */
 457         synchronize_rcu();
 458         skb_queue_purge(&sdata->u.mesh.skb_queue);
 459 }
 460
 461 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 462                                         u16 stype,
 463                                         struct ieee80211_mgmt *mgmt,
 464                                         size_t len,
 465                                         struct ieee80211_rx_status *rx_status)
 466 {
 467         struct ieee80211_local *local = sdata->local;
 468         struct ieee802_11_elems elems;
 469         struct ieee80211_channel *channel;
 470         u32 supp_rates = 0;
 471         size_t baselen;
 472         int freq;
 473         enum ieee80211_band band = rx_status->band;
 474
 475         /* ignore ProbeResp to foreign address */
 476         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 477             compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
 478                 return;
 479
 480         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 481         if (baselen > len)
 482                 return;
 483
 484         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 485                                &elems);
 486
 487         if (elems.ds_params && elems.ds_params_len == 1)
 488                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
 489         else
 490                 freq = rx_status->freq;
 491
 492         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 493
 494         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 495                 return;
 496
 497         if (elems.mesh_id && elems.mesh_config &&
 498             mesh_matches_local(&elems, sdata)) {
 499                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
 500
 501                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
 502                                       mesh_peer_accepts_plinks(&elems));
 503         }
 504 }
 505
 506 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 507                                           struct ieee80211_mgmt *mgmt,
 508                                           size_t len,
 509                                           struct ieee80211_rx_status *rx_status)
 510 {
 511         switch (mgmt->u.action.category) {
 512         case PLINK_CATEGORY:
 513                 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 514                 break;
 515         case MESH_PATH_SEL_CATEGORY:
 516                 mesh_rx_path_sel_frame(sdata, mgmt, len);
 517                 break;
 518         }
 519 }
 520
 521 static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 522                                           struct sk_buff *skb)
 523 {
 524         struct ieee80211_rx_status *rx_status;
 525         struct ieee80211_if_mesh *ifmsh;
 526         struct ieee80211_mgmt *mgmt;
 527         u16 stype;
 528
 529         ifmsh = &sdata->u.mesh;
 530
 531         rx_status = (struct ieee80211_rx_status *) skb->cb;
 532         mgmt = (struct ieee80211_mgmt *) skb->data;
 533         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 534
 535         switch (stype) {
 536         case IEEE80211_STYPE_PROBE_RESP:
 537         case IEEE80211_STYPE_BEACON:
 538                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 539                                             rx_status);
 540                 break;
 541         case IEEE80211_STYPE_ACTION:
 542                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 543                 break;
 544         }
 545
 546         kfree_skb(skb);
 547 }
 548
 549 static void ieee80211_mesh_work(struct work_struct *work)
 550 {
 551         struct ieee80211_sub_if_data *sdata =
 552                 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
 553         struct ieee80211_local *local = sdata->local;
 554         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 555         struct sk_buff *skb;
 556
 557         if (!netif_running(sdata->dev))
 558                 return;
 559
 560         if (local->sw_scanning || local->hw_scanning)
 561                 return;
 562
 563         while ((skb = skb_dequeue(&ifmsh->skb_queue)))
 564                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 565
 566         if (ifmsh->preq_queue_len &&
 567             time_after(jiffies,
 568                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 569                 mesh_path_start_discovery(sdata);
 570
 571         if (ifmsh->housekeeping)
 572                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 573 }
 574
 575 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 576 {
 577         struct ieee80211_sub_if_data *sdata;
 578
 579         rcu_read_lock();
 580         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 581                 if (ieee80211_vif_is_mesh(&sdata->vif))
 582                         queue_work(local->hw.workqueue, &sdata->u.mesh.work);
 583         rcu_read_unlock();
 584 }
 585
 586 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 587 {
 588         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 589
 590         INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
 591         setup_timer(&ifmsh->housekeeping_timer,
 592                     ieee80211_mesh_housekeeping_timer,
 593                     (unsigned long) sdata);
 594         skb_queue_head_init(&sdata->u.mesh.skb_queue);
 595
 596         ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
 597         ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
 598         ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
 599         ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
 600         ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
 601         ifmsh->mshcfg.auto_open_plinks = true;
 602         ifmsh->mshcfg.dot11MeshMaxPeerLinks =
 603                 MESH_MAX_ESTAB_PLINKS;
 604         ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
 605                 MESH_PATH_TIMEOUT;
 606         ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
 607                 MESH_PREQ_MIN_INT;
 608         ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
 609                 MESH_DIAM_TRAVERSAL_TIME;
 610         ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
 611                 MESH_MAX_PREQ_RETRIES;
 612         ifmsh->mshcfg.path_refresh_time =
 613                 MESH_PATH_REFRESH_TIME;
 614         ifmsh->mshcfg.min_discovery_timeout =
 615                 MESH_MIN_DISCOVERY_TIMEOUT;
 616         ifmsh->accepting_plinks = true;
 617         ifmsh->preq_id = 0;
 618         ifmsh->dsn = 0;
 619         atomic_set(&ifmsh->mpaths, 0);
 620         mesh_rmc_init(sdata);
 621         ifmsh->last_preq = jiffies;
 622         /* Allocate all mesh structures when creating the first mesh interface. */
 623         if (!mesh_allocated)
 624                 ieee80211s_init();
 625         mesh_ids_set_default(ifmsh);
 626         setup_timer(&ifmsh->mesh_path_timer,
 627                     ieee80211_mesh_path_timer,
 628                     (unsigned long) sdata);
 629         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 630         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 631 }
 632
 633 ieee80211_rx_result
 634 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 635                        struct ieee80211_rx_status *rx_status)
 636 {
 637         struct ieee80211_local *local = sdata->local;
 638         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 639         struct ieee80211_mgmt *mgmt;
 640         u16 fc;
 641
 642         if (skb->len < 24)
 643                 return RX_DROP_MONITOR;
 644
 645         mgmt = (struct ieee80211_mgmt *) skb->data;
 646         fc = le16_to_cpu(mgmt->frame_control);
 647
 648         switch (fc & IEEE80211_FCTL_STYPE) {
 649         case IEEE80211_STYPE_PROBE_RESP:
 650         case IEEE80211_STYPE_BEACON:
 651         case IEEE80211_STYPE_ACTION:
 652                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
 653                 skb_queue_tail(&ifmsh->skb_queue, skb);
 654                 queue_work(local->hw.workqueue, &ifmsh->work);
 655                 return RX_QUEUED;
 656         }
 657
 658         return RX_CONTINUE;
 659 }