net/mac80211/mesh.c

   1 /*
   2  * Copyright (c) 2008, 2009 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 <linux/slab.h>
  12 #include <asm/unaligned.h>
  13 #include "ieee80211_i.h"
  14 #include "mesh.h"
  15
  16 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
  17 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
  18 #define IEEE80211_MESH_RANN_INTERVAL         (1 * HZ)
  19
  20 #define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01
  21 #define MESHCONF_CAPAB_FORWARDING    0x08
  22
  23 #define TMR_RUNNING_HK  0
  24 #define TMR_RUNNING_MP  1
  25 #define TMR_RUNNING_MPR 2
  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         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  51
  52         if (local->quiescing) {
  53                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
  54                 return;
  55         }
  56
  57         ieee80211_queue_work(&local->hw, &sdata->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                 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  86                 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  87                 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  88                 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  89                 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth))
  90                 return true;
  91
  92         return false;
  93 }
  94
  95 /**
  96  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
  97  *
  98  * @ie: information elements of a management frame from the mesh peer
  99  */
 100 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 101 {
 102         return (ie->mesh_config->meshconf_cap &
 103             MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 104 }
 105
 106 /**
 107  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
 108  *
 109  * @sdata: mesh interface in which mesh beacons are going to be updated
 110  */
 111 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 112 {
 113         bool free_plinks;
 114
 115         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 116          * the mesh interface might be able to establish plinks with peers that
 117          * are already on the table but are not on PLINK_ESTAB state. However,
 118          * in general the mesh interface is not accepting peer link requests
 119          * from new peers, and that must be reflected in the beacon
 120          */
 121         free_plinks = mesh_plink_availables(sdata);
 122
 123         if (free_plinks != sdata->u.mesh.accepting_plinks)
 124                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
 125 }
 126
 127 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 128 {
 129         int i;
 130
 131         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 132         if (!sdata->u.mesh.rmc)
 133                 return -ENOMEM;
 134         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 135         for (i = 0; i < RMC_BUCKETS; i++)
 136                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
 137         return 0;
 138 }
 139
 140 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 141 {
 142         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 143         struct rmc_entry *p, *n;
 144         int i;
 145
 146         if (!sdata->u.mesh.rmc)
 147                 return;
 148
 149         for (i = 0; i < RMC_BUCKETS; i++)
 150                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
 151                         list_del(&p->list);
 152                         kmem_cache_free(rm_cache, p);
 153                 }
 154
 155         kfree(rmc);
 156         sdata->u.mesh.rmc = NULL;
 157 }
 158
 159 /**
 160  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 161  *
 162  * @sa:         source address
 163  * @mesh_hdr:   mesh_header
 164  *
 165  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 166  *
 167  * Checks using the source address and the mesh sequence number if we have
 168  * received this frame lately. If the frame is not in the cache, it is added to
 169  * it.
 170  */
 171 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 172                    struct ieee80211_sub_if_data *sdata)
 173 {
 174         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 175         u32 seqnum = 0;
 176         int entries = 0;
 177         u8 idx;
 178         struct rmc_entry *p, *n;
 179
 180         /* Don't care about endianness since only match matters */
 181         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 182         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 183         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
 184                 ++entries;
 185                 if (time_after(jiffies, p->exp_time) ||
 186                                 (entries == RMC_QUEUE_MAX_LEN)) {
 187                         list_del(&p->list);
 188                         kmem_cache_free(rm_cache, p);
 189                         --entries;
 190                 } else if ((seqnum == p->seqnum) &&
 191                            (memcmp(sa, p->sa, ETH_ALEN) == 0))
 192                         return -1;
 193         }
 194
 195         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 196         if (!p) {
 197                 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
 198                 return 0;
 199         }
 200         p->seqnum = seqnum;
 201         p->exp_time = jiffies + RMC_TIMEOUT;
 202         memcpy(p->sa, sa, ETH_ALEN);
 203         list_add(&p->list, &rmc->bucket[idx].list);
 204         return 0;
 205 }
 206
 207 void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 208 {
 209         struct ieee80211_local *local = sdata->local;
 210         struct ieee80211_supported_band *sband;
 211         u8 *pos;
 212         int len, i, rate;
 213         u8 neighbors;
 214
 215         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 216         len = sband->n_bitrates;
 217         if (len > 8)
 218                 len = 8;
 219         pos = skb_put(skb, len + 2);
 220         *pos++ = WLAN_EID_SUPP_RATES;
 221         *pos++ = len;
 222         for (i = 0; i < len; i++) {
 223                 rate = sband->bitrates[i].bitrate;
 224                 *pos++ = (u8) (rate / 5);
 225         }
 226
 227         if (sband->n_bitrates > len) {
 228                 pos = skb_put(skb, sband->n_bitrates - len + 2);
 229                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 230                 *pos++ = sband->n_bitrates - len;
 231                 for (i = len; i < sband->n_bitrates; i++) {
 232                         rate = sband->bitrates[i].bitrate;
 233                         *pos++ = (u8) (rate / 5);
 234                 }
 235         }
 236
 237         if (sband->band == IEEE80211_BAND_2GHZ) {
 238                 pos = skb_put(skb, 2 + 1);
 239                 *pos++ = WLAN_EID_DS_PARAMS;
 240                 *pos++ = 1;
 241                 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
 242         }
 243
 244         pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
 245         *pos++ = WLAN_EID_MESH_ID;
 246         *pos++ = sdata->u.mesh.mesh_id_len;
 247         if (sdata->u.mesh.mesh_id_len)
 248                 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
 249
 250         pos = skb_put(skb, 2 + sizeof(struct ieee80211_meshconf_ie));
 251         *pos++ = WLAN_EID_MESH_CONFIG;
 252         *pos++ = sizeof(struct ieee80211_meshconf_ie);
 253
 254         /* Active path selection protocol ID */
 255         *pos++ = sdata->u.mesh.mesh_pp_id;
 256
 257         /* Active path selection metric ID   */
 258         *pos++ = sdata->u.mesh.mesh_pm_id;
 259
 260         /* Congestion control mode identifier */
 261         *pos++ = sdata->u.mesh.mesh_cc_id;
 262
 263         /* Synchronization protocol identifier */
 264         *pos++ = sdata->u.mesh.mesh_sp_id;
 265
 266         /* Authentication Protocol identifier */
 267         *pos++ = sdata->u.mesh.mesh_auth_id;
 268
 269         /* Mesh Formation Info - number of neighbors */
 270         neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
 271         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 272         neighbors = (neighbors > 15) ? 15 : neighbors;
 273         *pos++ = neighbors << 1;
 274
 275         /* Mesh capability */
 276         sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
 277         *pos = MESHCONF_CAPAB_FORWARDING;
 278         *pos++ |= sdata->u.mesh.accepting_plinks ?
 279             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 280         *pos++ = 0x00;
 281
 282         if (sdata->u.mesh.vendor_ie) {
 283                 int len = sdata->u.mesh.vendor_ie_len;
 284                 const u8 *data = sdata->u.mesh.vendor_ie;
 285                 if (skb_tailroom(skb) > len)
 286                         memcpy(skb_put(skb, len), data, len);
 287         }
 288 }
 289
 290 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
 291 {
 292         /* Use last four bytes of hw addr and interface index as hash index */
 293         return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
 294                 & tbl->hash_mask;
 295 }
 296
 297 struct mesh_table *mesh_table_alloc(int size_order)
 298 {
 299         int i;
 300         struct mesh_table *newtbl;
 301
 302         newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
 303         if (!newtbl)
 304                 return NULL;
 305
 306         newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
 307                         (1 << size_order), GFP_KERNEL);
 308
 309         if (!newtbl->hash_buckets) {
 310                 kfree(newtbl);
 311                 return NULL;
 312         }
 313
 314         newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
 315                         (1 << size_order), GFP_KERNEL);
 316         if (!newtbl->hashwlock) {
 317                 kfree(newtbl->hash_buckets);
 318                 kfree(newtbl);
 319                 return NULL;
 320         }
 321
 322         newtbl->size_order = size_order;
 323         newtbl->hash_mask = (1 << size_order) - 1;
 324         atomic_set(&newtbl->entries,  0);
 325         get_random_bytes(&newtbl->hash_rnd,
 326                         sizeof(newtbl->hash_rnd));
 327         for (i = 0; i <= newtbl->hash_mask; i++)
 328                 spin_lock_init(&newtbl->hashwlock[i]);
 329
 330         return newtbl;
 331 }
 332
 333
 334 static void ieee80211_mesh_path_timer(unsigned long data)
 335 {
 336         struct ieee80211_sub_if_data *sdata =
 337                 (struct ieee80211_sub_if_data *) data;
 338         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 339         struct ieee80211_local *local = sdata->local;
 340
 341         if (local->quiescing) {
 342                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 343                 return;
 344         }
 345
 346         ieee80211_queue_work(&local->hw, &sdata->work);
 347 }
 348
 349 static void ieee80211_mesh_path_root_timer(unsigned long data)
 350 {
 351         struct ieee80211_sub_if_data *sdata =
 352                 (struct ieee80211_sub_if_data *) data;
 353         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 354         struct ieee80211_local *local = sdata->local;
 355
 356         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 357
 358         if (local->quiescing) {
 359                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 360                 return;
 361         }
 362
 363         ieee80211_queue_work(&local->hw, &sdata->work);
 364 }
 365
 366 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 367 {
 368         if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
 369                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 370         else {
 371                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 372                 /* stop running timer */
 373                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 374         }
 375 }
 376
 377 /**
 378  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 379  * @hdr:        802.11 frame header
 380  * @fc:         frame control field
 381  * @meshda:     destination address in the mesh
 382  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 383  *              locally originated.
 384  *
 385  * Return the length of the 802.11 (does not include a mesh control header)
 386  */
 387 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 388                                   const u8 *meshda, const u8 *meshsa)
 389 {
 390         if (is_multicast_ether_addr(meshda)) {
 391                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 392                 /* DA TA SA */
 393                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 394                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 395                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 396                 return 24;
 397         } else {
 398                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
 399                                 IEEE80211_FCTL_TODS);
 400                 /* RA TA DA SA */
 401                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 402                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 403                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 404                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 405                 return 30;
 406         }
 407 }
 408
 409 /**
 410  * ieee80211_new_mesh_header - create a new mesh header
 411  * @meshhdr:    uninitialized mesh header
 412  * @sdata:      mesh interface to be used
 413  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 414  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 415  *              be NULL.
 416  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 417  *              mesh frame
 418  *
 419  * Return the header length.
 420  */
 421 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 422                 struct ieee80211_sub_if_data *sdata, char *addr4or5,
 423                 char *addr6)
 424 {
 425         int aelen = 0;
 426         BUG_ON(!addr4or5 && addr6);
 427         memset(meshhdr, 0, sizeof(*meshhdr));
 428         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 429         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 430         sdata->u.mesh.mesh_seqnum++;
 431         if (addr4or5 && !addr6) {
 432                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 433                 aelen += ETH_ALEN;
 434                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 435         } else if (addr4or5 && addr6) {
 436                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 437                 aelen += 2 * ETH_ALEN;
 438                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 439                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 440         }
 441         return 6 + aelen;
 442 }
 443
 444 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 445                            struct ieee80211_if_mesh *ifmsh)
 446 {
 447         bool free_plinks;
 448
 449 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 450         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 451                sdata->name);
 452 #endif
 453
 454         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 455         mesh_path_expire(sdata);
 456
 457         free_plinks = mesh_plink_availables(sdata);
 458         if (free_plinks != sdata->u.mesh.accepting_plinks)
 459                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 460
 461         mod_timer(&ifmsh->housekeeping_timer,
 462                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 463 }
 464
 465 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 466 {
 467         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 468
 469         mesh_path_tx_root_frame(sdata);
 470         mod_timer(&ifmsh->mesh_path_root_timer,
 471                   round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL));
 472 }
 473
 474 #ifdef CONFIG_PM
 475 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 476 {
 477         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 478
 479         /* use atomic bitops in case both timers fire at the same time */
 480
 481         if (del_timer_sync(&ifmsh->housekeeping_timer))
 482                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 483         if (del_timer_sync(&ifmsh->mesh_path_timer))
 484                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 485         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 486                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 487 }
 488
 489 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 490 {
 491         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 492
 493         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 494                 add_timer(&ifmsh->housekeeping_timer);
 495         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 496                 add_timer(&ifmsh->mesh_path_timer);
 497         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 498                 add_timer(&ifmsh->mesh_path_root_timer);
 499         ieee80211_mesh_root_setup(ifmsh);
 500 }
 501 #endif
 502
 503 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 504 {
 505         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 506         struct ieee80211_local *local = sdata->local;
 507
 508         local->fif_other_bss++;
 509         /* mesh ifaces must set allmulti to forward mcast traffic */
 510         atomic_inc(&local->iff_allmultis);
 511         ieee80211_configure_filter(local);
 512
 513         ifmsh->mesh_cc_id = 0;  /* Disabled */
 514         ifmsh->mesh_sp_id = 0;  /* Neighbor Offset */
 515         ifmsh->mesh_auth_id = 0;        /* Disabled */
 516         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 517         ieee80211_mesh_root_setup(ifmsh);
 518         ieee80211_queue_work(&local->hw, &sdata->work);
 519         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 520         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 521                                                 BSS_CHANGED_BEACON_ENABLED |
 522                                                 BSS_CHANGED_BEACON_INT);
 523 }
 524
 525 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 526 {
 527         struct ieee80211_local *local = sdata->local;
 528         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 529
 530         ifmsh->mesh_id_len = 0;
 531         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 532         sta_info_flush(local, NULL);
 533
 534         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 535         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 536         /*
 537          * If the timer fired while we waited for it, it will have
 538          * requeued the work. Now the work will be running again
 539          * but will not rearm the timer again because it checks
 540          * whether the interface is running, which, at this point,
 541          * it no longer is.
 542          */
 543         cancel_work_sync(&sdata->work);
 544
 545         local->fif_other_bss--;
 546         atomic_dec(&local->iff_allmultis);
 547         ieee80211_configure_filter(local);
 548 }
 549
 550 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 551                                         u16 stype,
 552                                         struct ieee80211_mgmt *mgmt,
 553                                         size_t len,
 554                                         struct ieee80211_rx_status *rx_status)
 555 {
 556         struct ieee80211_local *local = sdata->local;
 557         struct ieee802_11_elems elems;
 558         struct ieee80211_channel *channel;
 559         u32 supp_rates = 0;
 560         size_t baselen;
 561         int freq;
 562         enum ieee80211_band band = rx_status->band;
 563
 564         /* ignore ProbeResp to foreign address */
 565         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 566             compare_ether_addr(mgmt->da, sdata->vif.addr))
 567                 return;
 568
 569         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 570         if (baselen > len)
 571                 return;
 572
 573         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 574                                &elems);
 575
 576         if (elems.ds_params && elems.ds_params_len == 1)
 577                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
 578         else
 579                 freq = rx_status->freq;
 580
 581         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 582
 583         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 584                 return;
 585
 586         if (elems.mesh_id && elems.mesh_config &&
 587             mesh_matches_local(&elems, sdata)) {
 588                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
 589
 590                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
 591                                       mesh_peer_accepts_plinks(&elems));
 592         }
 593 }
 594
 595 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 596                                           struct ieee80211_mgmt *mgmt,
 597                                           size_t len,
 598                                           struct ieee80211_rx_status *rx_status)
 599 {
 600         switch (mgmt->u.action.category) {
 601         case WLAN_CATEGORY_MESH_PLINK:
 602                 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 603                 break;
 604         case WLAN_CATEGORY_MESH_PATH_SEL:
 605                 mesh_rx_path_sel_frame(sdata, mgmt, len);
 606                 break;
 607         }
 608 }
 609
 610 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 611                                    struct sk_buff *skb)
 612 {
 613         struct ieee80211_rx_status *rx_status;
 614         struct ieee80211_if_mesh *ifmsh;
 615         struct ieee80211_mgmt *mgmt;
 616         u16 stype;
 617
 618         ifmsh = &sdata->u.mesh;
 619
 620         rx_status = IEEE80211_SKB_RXCB(skb);
 621         mgmt = (struct ieee80211_mgmt *) skb->data;
 622         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 623
 624         switch (stype) {
 625         case IEEE80211_STYPE_PROBE_RESP:
 626         case IEEE80211_STYPE_BEACON:
 627                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 628                                             rx_status);
 629                 break;
 630         case IEEE80211_STYPE_ACTION:
 631                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 632                 break;
 633         }
 634 }
 635
 636 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 637 {
 638         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 639
 640         if (ifmsh->preq_queue_len &&
 641             time_after(jiffies,
 642                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 643                 mesh_path_start_discovery(sdata);
 644
 645         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 646                 mesh_mpath_table_grow();
 647
 648         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 649                 mesh_mpp_table_grow();
 650
 651         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 652                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 653
 654         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 655                 ieee80211_mesh_rootpath(sdata);
 656 }
 657
 658 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 659 {
 660         struct ieee80211_sub_if_data *sdata;
 661
 662         rcu_read_lock();
 663         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 664                 if (ieee80211_vif_is_mesh(&sdata->vif))
 665                         ieee80211_queue_work(&local->hw, &sdata->work);
 666         rcu_read_unlock();
 667 }
 668
 669 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 670 {
 671         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 672
 673         setup_timer(&ifmsh->housekeeping_timer,
 674                     ieee80211_mesh_housekeeping_timer,
 675                     (unsigned long) sdata);
 676
 677         ifmsh->accepting_plinks = true;
 678         ifmsh->preq_id = 0;
 679         ifmsh->sn = 0;
 680         atomic_set(&ifmsh->mpaths, 0);
 681         mesh_rmc_init(sdata);
 682         ifmsh->last_preq = jiffies;
 683         /* Allocate all mesh structures when creating the first mesh interface. */
 684         if (!mesh_allocated)
 685                 ieee80211s_init();
 686         setup_timer(&ifmsh->mesh_path_timer,
 687                     ieee80211_mesh_path_timer,
 688                     (unsigned long) sdata);
 689         setup_timer(&ifmsh->mesh_path_root_timer,
 690                     ieee80211_mesh_path_root_timer,
 691                     (unsigned long) sdata);
 692         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 693         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 694 }