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->wrkq_flags |= MESH_WORK_HOUSEKEEPING;
  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
 324 static void ieee80211_mesh_path_timer(unsigned long data)
 325 {
 326         struct ieee80211_sub_if_data *sdata =
 327                 (struct ieee80211_sub_if_data *) data;
 328         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 329         struct ieee80211_local *local = sdata->local;
 330
 331         if (local->quiescing) {
 332                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 333                 return;
 334         }
 335
 336         ieee80211_queue_work(&local->hw, &ifmsh->work);
 337 }
 338
 339 /**
 340  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 341  * @hdr:        802.11 frame header
 342  * @fc:         frame control field
 343  * @meshda:     destination address in the mesh
 344  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 345  *              locally originated.
 346  *
 347  * Return the length of the 802.11 (does not include a mesh control header)
 348  */
 349 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, char
 350                 *meshda, char *meshsa) {
 351         if (is_multicast_ether_addr(meshda)) {
 352                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 353                 /* DA TA SA */
 354                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 355                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 356                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 357                 return 24;
 358         } else {
 359                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
 360                                 IEEE80211_FCTL_TODS);
 361                 /* RA TA DA SA */
 362                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 363                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 364                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 365                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 366                 return 30;
 367         }
 368 }
 369
 370 /**
 371  * ieee80211_new_mesh_header - create a new mesh header
 372  * @meshhdr:    uninitialized mesh header
 373  * @sdata:      mesh interface to be used
 374  * @addr4:      addr4 of the mesh frame (1st in ae header)
 375  *              may be NULL
 376  * @addr5:      addr5 of the mesh frame (1st or 2nd in ae header)
 377  *              may be NULL unless addr6 is present
 378  * @addr6:      addr6 of the mesh frame (2nd or 3rd in ae header)
 379  *              may be NULL unless addr5 is present
 380  *
 381  * Return the header length.
 382  */
 383 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 384                 struct ieee80211_sub_if_data *sdata, char *addr4,
 385                 char *addr5, char *addr6)
 386 {
 387         int aelen = 0;
 388         memset(meshhdr, 0, sizeof(meshhdr));
 389         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 390         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 391         sdata->u.mesh.mesh_seqnum++;
 392         if (addr4) {
 393                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 394                 aelen += ETH_ALEN;
 395                 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
 396         }
 397         if (addr5 && addr6) {
 398                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 399                 aelen += 2 * ETH_ALEN;
 400                 if (!addr4) {
 401                         memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
 402                         memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 403                 } else {
 404                         memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
 405                         memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
 406                 }
 407         }
 408         return 6 + aelen;
 409 }
 410
 411 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 412                            struct ieee80211_if_mesh *ifmsh)
 413 {
 414         bool free_plinks;
 415
 416 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 417         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 418                sdata->dev->name);
 419 #endif
 420
 421         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 422         mesh_path_expire(sdata);
 423
 424         free_plinks = mesh_plink_availables(sdata);
 425         if (free_plinks != sdata->u.mesh.accepting_plinks)
 426                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 427
 428         mod_timer(&ifmsh->housekeeping_timer,
 429                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 430 }
 431
 432 #ifdef CONFIG_PM
 433 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 434 {
 435         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 436
 437         /* might restart the timer but that doesn't matter */
 438         cancel_work_sync(&ifmsh->work);
 439
 440         /* use atomic bitops in case both timers fire at the same time */
 441
 442         if (del_timer_sync(&ifmsh->housekeeping_timer))
 443                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 444         if (del_timer_sync(&ifmsh->mesh_path_timer))
 445                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 446 }
 447
 448 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 449 {
 450         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 451
 452         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 453                 add_timer(&ifmsh->housekeeping_timer);
 454         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 455                 add_timer(&ifmsh->mesh_path_timer);
 456 }
 457 #endif
 458
 459 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 460 {
 461         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 462         struct ieee80211_local *local = sdata->local;
 463
 464         ifmsh->wrkq_flags |= MESH_WORK_HOUSEKEEPING;
 465         ieee80211_queue_work(&local->hw, &ifmsh->work);
 466         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 467         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 468                                                 BSS_CHANGED_BEACON_ENABLED |
 469                                                 BSS_CHANGED_BEACON_INT);
 470 }
 471
 472 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 473 {
 474         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 475         /*
 476          * If the timer fired while we waited for it, it will have
 477          * requeued the work. Now the work will be running again
 478          * but will not rearm the timer again because it checks
 479          * whether the interface is running, which, at this point,
 480          * it no longer is.
 481          */
 482         cancel_work_sync(&sdata->u.mesh.work);
 483
 484         /*
 485          * When we get here, the interface is marked down.
 486          * Call synchronize_rcu() to wait for the RX path
 487          * should it be using the interface and enqueuing
 488          * frames at this very time on another CPU.
 489          */
 490         rcu_barrier(); /* Wait for RX path and call_rcu()'s */
 491         skb_queue_purge(&sdata->u.mesh.skb_queue);
 492 }
 493
 494 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 495                                         u16 stype,
 496                                         struct ieee80211_mgmt *mgmt,
 497                                         size_t len,
 498                                         struct ieee80211_rx_status *rx_status)
 499 {
 500         struct ieee80211_local *local = sdata->local;
 501         struct ieee802_11_elems elems;
 502         struct ieee80211_channel *channel;
 503         u32 supp_rates = 0;
 504         size_t baselen;
 505         int freq;
 506         enum ieee80211_band band = rx_status->band;
 507
 508         /* ignore ProbeResp to foreign address */
 509         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 510             compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
 511                 return;
 512
 513         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 514         if (baselen > len)
 515                 return;
 516
 517         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 518                                &elems);
 519
 520         if (elems.ds_params && elems.ds_params_len == 1)
 521                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
 522         else
 523                 freq = rx_status->freq;
 524
 525         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 526
 527         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 528                 return;
 529
 530         if (elems.mesh_id && elems.mesh_config &&
 531             mesh_matches_local(&elems, sdata)) {
 532                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
 533
 534                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
 535                                       mesh_peer_accepts_plinks(&elems));
 536         }
 537 }
 538
 539 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 540                                           struct ieee80211_mgmt *mgmt,
 541                                           size_t len,
 542                                           struct ieee80211_rx_status *rx_status)
 543 {
 544         switch (mgmt->u.action.category) {
 545         case PLINK_CATEGORY:
 546                 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 547                 break;
 548         case MESH_PATH_SEL_CATEGORY:
 549                 mesh_rx_path_sel_frame(sdata, mgmt, len);
 550                 break;
 551         }
 552 }
 553
 554 static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 555                                           struct sk_buff *skb)
 556 {
 557         struct ieee80211_rx_status *rx_status;
 558         struct ieee80211_if_mesh *ifmsh;
 559         struct ieee80211_mgmt *mgmt;
 560         u16 stype;
 561
 562         ifmsh = &sdata->u.mesh;
 563
 564         rx_status = IEEE80211_SKB_RXCB(skb);
 565         mgmt = (struct ieee80211_mgmt *) skb->data;
 566         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 567
 568         switch (stype) {
 569         case IEEE80211_STYPE_PROBE_RESP:
 570         case IEEE80211_STYPE_BEACON:
 571                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 572                                             rx_status);
 573                 break;
 574         case IEEE80211_STYPE_ACTION:
 575                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 576                 break;
 577         }
 578
 579         kfree_skb(skb);
 580 }
 581
 582 static void ieee80211_mesh_work(struct work_struct *work)
 583 {
 584         struct ieee80211_sub_if_data *sdata =
 585                 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
 586         struct ieee80211_local *local = sdata->local;
 587         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 588         struct sk_buff *skb;
 589
 590         if (!netif_running(sdata->dev))
 591                 return;
 592
 593         if (local->scanning)
 594                 return;
 595
 596         while ((skb = skb_dequeue(&ifmsh->skb_queue)))
 597                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 598
 599         if (ifmsh->preq_queue_len &&
 600             time_after(jiffies,
 601                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 602                 mesh_path_start_discovery(sdata);
 603
 604         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 605                 mesh_mpath_table_grow();
 606
 607         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 608                 mesh_mpp_table_grow();
 609
 610         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 611                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 612 }
 613
 614 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 615 {
 616         struct ieee80211_sub_if_data *sdata;
 617
 618         rcu_read_lock();
 619         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 620                 if (ieee80211_vif_is_mesh(&sdata->vif))
 621                         ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
 622         rcu_read_unlock();
 623 }
 624
 625 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 626 {
 627         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 628
 629         INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
 630         setup_timer(&ifmsh->housekeeping_timer,
 631                     ieee80211_mesh_housekeeping_timer,
 632                     (unsigned long) sdata);
 633         skb_queue_head_init(&sdata->u.mesh.skb_queue);
 634
 635         ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
 636         ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
 637         ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
 638         ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
 639         ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
 640         ifmsh->mshcfg.auto_open_plinks = true;
 641         ifmsh->mshcfg.dot11MeshMaxPeerLinks =
 642                 MESH_MAX_ESTAB_PLINKS;
 643         ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
 644                 MESH_PATH_TIMEOUT;
 645         ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
 646                 MESH_PREQ_MIN_INT;
 647         ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
 648                 MESH_DIAM_TRAVERSAL_TIME;
 649         ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
 650                 MESH_MAX_PREQ_RETRIES;
 651         ifmsh->mshcfg.path_refresh_time =
 652                 MESH_PATH_REFRESH_TIME;
 653         ifmsh->mshcfg.min_discovery_timeout =
 654                 MESH_MIN_DISCOVERY_TIMEOUT;
 655         ifmsh->accepting_plinks = true;
 656         ifmsh->preq_id = 0;
 657         ifmsh->dsn = 0;
 658         atomic_set(&ifmsh->mpaths, 0);
 659         mesh_rmc_init(sdata);
 660         ifmsh->last_preq = jiffies;
 661         /* Allocate all mesh structures when creating the first mesh interface. */
 662         if (!mesh_allocated)
 663                 ieee80211s_init();
 664         mesh_ids_set_default(ifmsh);
 665         setup_timer(&ifmsh->mesh_path_timer,
 666                     ieee80211_mesh_path_timer,
 667                     (unsigned long) sdata);
 668         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 669         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 670 }
 671
 672 ieee80211_rx_result
 673 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 674 {
 675         struct ieee80211_local *local = sdata->local;
 676         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 677         struct ieee80211_mgmt *mgmt;
 678         u16 fc;
 679
 680         if (skb->len < 24)
 681                 return RX_DROP_MONITOR;
 682
 683         mgmt = (struct ieee80211_mgmt *) skb->data;
 684         fc = le16_to_cpu(mgmt->frame_control);
 685
 686         switch (fc & IEEE80211_FCTL_STYPE) {
 687         case IEEE80211_STYPE_ACTION:
 688                 if (skb->len < IEEE80211_MIN_ACTION_SIZE)
 689                         return RX_DROP_MONITOR;
 690                 /* fall through */
 691         case IEEE80211_STYPE_PROBE_RESP:
 692         case IEEE80211_STYPE_BEACON:
 693                 skb_queue_tail(&ifmsh->skb_queue, skb);
 694                 ieee80211_queue_work(&local->hw, &ifmsh->work);
 695                 return RX_QUEUED;
 696         }
 697
 698         return RX_CONTINUE;
 699 }