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         queue_work(local->hw.workqueue, &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         queue_work(local->hw.workqueue, &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_new_mesh_header - create a new mesh header
 403  * @meshhdr:    uninitialized mesh header
 404  * @sdata:      mesh interface to be used
 405  *
 406  * Return the header length.
 407  */
 408 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 409                 struct ieee80211_sub_if_data *sdata)
 410 {
 411         meshhdr->flags = 0;
 412         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 413         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 414         sdata->u.mesh.mesh_seqnum++;
 415
 416         return 6;
 417 }
 418
 419 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 420                            struct ieee80211_if_mesh *ifmsh)
 421 {
 422         bool free_plinks;
 423
 424 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 425         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 426                sdata->dev->name);
 427 #endif
 428
 429         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 430         mesh_path_expire(sdata);
 431
 432         free_plinks = mesh_plink_availables(sdata);
 433         if (free_plinks != sdata->u.mesh.accepting_plinks)
 434                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 435
 436         ifmsh->housekeeping = false;
 437         mod_timer(&ifmsh->housekeeping_timer,
 438                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 439 }
 440
 441 #ifdef CONFIG_PM
 442 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 443 {
 444         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 445
 446         /* might restart the timer but that doesn't matter */
 447         cancel_work_sync(&ifmsh->work);
 448
 449         /* use atomic bitops in case both timers fire at the same time */
 450
 451         if (del_timer_sync(&ifmsh->housekeeping_timer))
 452                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 453         if (del_timer_sync(&ifmsh->mesh_path_timer))
 454                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 455 }
 456
 457 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 458 {
 459         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 460
 461         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 462                 add_timer(&ifmsh->housekeeping_timer);
 463         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 464                 add_timer(&ifmsh->mesh_path_timer);
 465 }
 466 #endif
 467
 468 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 469 {
 470         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 471         struct ieee80211_local *local = sdata->local;
 472
 473         ifmsh->housekeeping = true;
 474         queue_work(local->hw.workqueue, &ifmsh->work);
 475         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 476                                                 BSS_CHANGED_BEACON_ENABLED);
 477 }
 478
 479 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 480 {
 481         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 482         /*
 483          * If the timer fired while we waited for it, it will have
 484          * requeued the work. Now the work will be running again
 485          * but will not rearm the timer again because it checks
 486          * whether the interface is running, which, at this point,
 487          * it no longer is.
 488          */
 489         cancel_work_sync(&sdata->u.mesh.work);
 490
 491         /*
 492          * When we get here, the interface is marked down.
 493          * Call synchronize_rcu() to wait for the RX path
 494          * should it be using the interface and enqueuing
 495          * frames at this very time on another CPU.
 496          */
 497         synchronize_rcu();
 498         skb_queue_purge(&sdata->u.mesh.skb_queue);
 499 }
 500
 501 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 502                                         u16 stype,
 503                                         struct ieee80211_mgmt *mgmt,
 504                                         size_t len,
 505                                         struct ieee80211_rx_status *rx_status)
 506 {
 507         struct ieee80211_local *local = sdata->local;
 508         struct ieee802_11_elems elems;
 509         struct ieee80211_channel *channel;
 510         u32 supp_rates = 0;
 511         size_t baselen;
 512         int freq;
 513         enum ieee80211_band band = rx_status->band;
 514
 515         /* ignore ProbeResp to foreign address */
 516         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 517             compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
 518                 return;
 519
 520         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 521         if (baselen > len)
 522                 return;
 523
 524         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 525                                &elems);
 526
 527         if (elems.ds_params && elems.ds_params_len == 1)
 528                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
 529         else
 530                 freq = rx_status->freq;
 531
 532         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 533
 534         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 535                 return;
 536
 537         if (elems.mesh_id && elems.mesh_config &&
 538             mesh_matches_local(&elems, sdata)) {
 539                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
 540
 541                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
 542                                       mesh_peer_accepts_plinks(&elems));
 543         }
 544 }
 545
 546 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 547                                           struct ieee80211_mgmt *mgmt,
 548                                           size_t len,
 549                                           struct ieee80211_rx_status *rx_status)
 550 {
 551         switch (mgmt->u.action.category) {
 552         case PLINK_CATEGORY:
 553                 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 554                 break;
 555         case MESH_PATH_SEL_CATEGORY:
 556                 mesh_rx_path_sel_frame(sdata, mgmt, len);
 557                 break;
 558         }
 559 }
 560
 561 static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 562                                           struct sk_buff *skb)
 563 {
 564         struct ieee80211_rx_status *rx_status;
 565         struct ieee80211_if_mesh *ifmsh;
 566         struct ieee80211_mgmt *mgmt;
 567         u16 stype;
 568
 569         ifmsh = &sdata->u.mesh;
 570
 571         rx_status = (struct ieee80211_rx_status *) skb->cb;
 572         mgmt = (struct ieee80211_mgmt *) skb->data;
 573         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 574
 575         switch (stype) {
 576         case IEEE80211_STYPE_PROBE_RESP:
 577         case IEEE80211_STYPE_BEACON:
 578                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 579                                             rx_status);
 580                 break;
 581         case IEEE80211_STYPE_ACTION:
 582                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 583                 break;
 584         }
 585
 586         kfree_skb(skb);
 587 }
 588
 589 static void ieee80211_mesh_work(struct work_struct *work)
 590 {
 591         struct ieee80211_sub_if_data *sdata =
 592                 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
 593         struct ieee80211_local *local = sdata->local;
 594         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 595         struct sk_buff *skb;
 596
 597         if (!netif_running(sdata->dev))
 598                 return;
 599
 600         if (local->sw_scanning || local->hw_scanning)
 601                 return;
 602
 603         while ((skb = skb_dequeue(&ifmsh->skb_queue)))
 604                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 605
 606         if (ifmsh->preq_queue_len &&
 607             time_after(jiffies,
 608                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 609                 mesh_path_start_discovery(sdata);
 610
 611         if (ifmsh->housekeeping)
 612                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 613 }
 614
 615 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 616 {
 617         struct ieee80211_sub_if_data *sdata;
 618
 619         rcu_read_lock();
 620         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 621                 if (ieee80211_vif_is_mesh(&sdata->vif))
 622                         queue_work(local->hw.workqueue, &sdata->u.mesh.work);
 623         rcu_read_unlock();
 624 }
 625
 626 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 627 {
 628         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 629
 630         INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
 631         setup_timer(&ifmsh->housekeeping_timer,
 632                     ieee80211_mesh_housekeeping_timer,
 633                     (unsigned long) sdata);
 634         skb_queue_head_init(&sdata->u.mesh.skb_queue);
 635
 636         ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
 637         ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
 638         ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
 639         ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
 640         ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
 641         ifmsh->mshcfg.auto_open_plinks = true;
 642         ifmsh->mshcfg.dot11MeshMaxPeerLinks =
 643                 MESH_MAX_ESTAB_PLINKS;
 644         ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
 645                 MESH_PATH_TIMEOUT;
 646         ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
 647                 MESH_PREQ_MIN_INT;
 648         ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
 649                 MESH_DIAM_TRAVERSAL_TIME;
 650         ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
 651                 MESH_MAX_PREQ_RETRIES;
 652         ifmsh->mshcfg.path_refresh_time =
 653                 MESH_PATH_REFRESH_TIME;
 654         ifmsh->mshcfg.min_discovery_timeout =
 655                 MESH_MIN_DISCOVERY_TIMEOUT;
 656         ifmsh->accepting_plinks = true;
 657         ifmsh->preq_id = 0;
 658         ifmsh->dsn = 0;
 659         atomic_set(&ifmsh->mpaths, 0);
 660         mesh_rmc_init(sdata);
 661         ifmsh->last_preq = jiffies;
 662         /* Allocate all mesh structures when creating the first mesh interface. */
 663         if (!mesh_allocated)
 664                 ieee80211s_init();
 665         mesh_ids_set_default(ifmsh);
 666         setup_timer(&ifmsh->mesh_path_timer,
 667                     ieee80211_mesh_path_timer,
 668                     (unsigned long) sdata);
 669         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 670         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 671 }
 672
 673 ieee80211_rx_result
 674 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 675                        struct ieee80211_rx_status *rx_status)
 676 {
 677         struct ieee80211_local *local = sdata->local;
 678         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 679         struct ieee80211_mgmt *mgmt;
 680         u16 fc;
 681
 682         if (skb->len < 24)
 683                 return RX_DROP_MONITOR;
 684
 685         mgmt = (struct ieee80211_mgmt *) skb->data;
 686         fc = le16_to_cpu(mgmt->frame_control);
 687
 688         switch (fc & IEEE80211_FCTL_STYPE) {
 689         case IEEE80211_STYPE_PROBE_RESP:
 690         case IEEE80211_STYPE_BEACON:
 691         case IEEE80211_STYPE_ACTION:
 692                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
 693                 skb_queue_tail(&ifmsh->skb_queue, skb);
 694                 queue_work(local->hw.workqueue, &ifmsh->work);
 695                 return RX_QUEUED;
 696         }
 697
 698         return RX_CONTINUE;
 699 }