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   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 MESHCONF_PP_OFFSET      0               /* Path Selection Protocol */
  19 #define MESHCONF_PM_OFFSET      1               /* Path Selection Metric   */
  20 #define MESHCONF_CC_OFFSET      2               /* Congestion Control Mode */
  21 #define MESHCONF_SP_OFFSET      3               /* Synchronization Protocol */
  22 #define MESHCONF_AUTH_OFFSET    4               /* Authentication Protocol */
  23 #define MESHCONF_CAPAB_OFFSET   6
  24 #define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01
  25 #define MESHCONF_CAPAB_FORWARDING    0x08
  26
  27 #define TMR_RUNNING_HK  0
  28 #define TMR_RUNNING_MP  1
  29
  30 int mesh_allocated;
  31 static struct kmem_cache *rm_cache;
  32
  33 void ieee80211s_init(void)
  34 {
  35         mesh_pathtbl_init();
  36         mesh_allocated = 1;
  37         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  38                                      0, 0, NULL);
  39 }
  40
  41 void ieee80211s_stop(void)
  42 {
  43         mesh_pathtbl_unregister();
  44         kmem_cache_destroy(rm_cache);
  45 }
  46
  47 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  48 {
  49         struct ieee80211_sub_if_data *sdata = (void *) data;
  50         struct ieee80211_local *local = sdata->local;
  51         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  52
  53         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  54
  55         if (local->quiescing) {
  56                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
  57                 return;
  58         }
  59
  60         ieee80211_queue_work(&local->hw, &ifmsh->work);
  61 }
  62
  63 /**
  64  * mesh_matches_local - check if the config of a mesh point matches ours
  65  *
  66  * @ie: information elements of a management frame from the mesh peer
  67  * @sdata: local mesh subif
  68  *
  69  * This function checks if the mesh configuration of a mesh point matches the
  70  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  71  */
  72 bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
  73 {
  74         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  75
  76         /*
  77          * As support for each feature is added, check for matching
  78          * - On mesh config capabilities
  79          *   - Power Save Support En
  80          *   - Sync support enabled
  81          *   - Sync support active
  82          *   - Sync support required from peer
  83          *   - MDA enabled
  84          * - Power management control on fc
  85          */
  86         if (ifmsh->mesh_id_len == ie->mesh_id_len &&
  87                 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  88                 (ifmsh->mesh_pp_id == *(ie->mesh_config + MESHCONF_PP_OFFSET))&&
  89                 (ifmsh->mesh_pm_id == *(ie->mesh_config + MESHCONF_PM_OFFSET))&&
  90                 (ifmsh->mesh_cc_id == *(ie->mesh_config + MESHCONF_CC_OFFSET))&&
  91                 (ifmsh->mesh_sp_id == *(ie->mesh_config + MESHCONF_SP_OFFSET))&&
  92                 (ifmsh->mesh_auth_id == *(ie->mesh_config +
  93                     MESHCONF_AUTH_OFFSET)))
  94                 return true;
  95
  96         return false;
  97 }
  98
  99 /**
 100  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 101  *
 102  * @ie: information elements of a management frame from the mesh peer
 103  */
 104 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 105 {
 106         return (*(ie->mesh_config + MESHCONF_CAPAB_OFFSET) &
 107             MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 108 }
 109
 110 /**
 111  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
 112  *
 113  * @sdata: mesh interface in which mesh beacons are going to be updated
 114  */
 115 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 116 {
 117         bool free_plinks;
 118
 119         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 120          * the mesh interface might be able to establish plinks with peers that
 121          * are already on the table but are not on PLINK_ESTAB state. However,
 122          * in general the mesh interface is not accepting peer link requests
 123          * from new peers, and that must be reflected in the beacon
 124          */
 125         free_plinks = mesh_plink_availables(sdata);
 126
 127         if (free_plinks != sdata->u.mesh.accepting_plinks)
 128                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
 129 }
 130
 131 void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
 132 {
 133         sta->mesh_pp_id = 0;    /* HWMP */
 134         sta->mesh_pm_id = 0;    /* Airtime */
 135         sta->mesh_cc_id = 0;    /* Disabled */
 136         sta->mesh_sp_id = 0;    /* Neighbor Offset */
 137         sta->mesh_auth_id = 0;  /* Disabled */
 138 }
 139
 140 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 141 {
 142         int i;
 143
 144         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 145         if (!sdata->u.mesh.rmc)
 146                 return -ENOMEM;
 147         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 148         for (i = 0; i < RMC_BUCKETS; i++)
 149                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
 150         return 0;
 151 }
 152
 153 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 154 {
 155         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 156         struct rmc_entry *p, *n;
 157         int i;
 158
 159         if (!sdata->u.mesh.rmc)
 160                 return;
 161
 162         for (i = 0; i < RMC_BUCKETS; i++)
 163                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
 164                         list_del(&p->list);
 165                         kmem_cache_free(rm_cache, p);
 166                 }
 167
 168         kfree(rmc);
 169         sdata->u.mesh.rmc = NULL;
 170 }
 171
 172 /**
 173  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 174  *
 175  * @sa:         source address
 176  * @mesh_hdr:   mesh_header
 177  *
 178  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 179  *
 180  * Checks using the source address and the mesh sequence number if we have
 181  * received this frame lately. If the frame is not in the cache, it is added to
 182  * it.
 183  */
 184 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 185                    struct ieee80211_sub_if_data *sdata)
 186 {
 187         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 188         u32 seqnum = 0;
 189         int entries = 0;
 190         u8 idx;
 191         struct rmc_entry *p, *n;
 192
 193         /* Don't care about endianness since only match matters */
 194         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 195         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 196         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
 197                 ++entries;
 198                 if (time_after(jiffies, p->exp_time) ||
 199                                 (entries == RMC_QUEUE_MAX_LEN)) {
 200                         list_del(&p->list);
 201                         kmem_cache_free(rm_cache, p);
 202                         --entries;
 203                 } else if ((seqnum == p->seqnum)
 204                                 && (memcmp(sa, p->sa, ETH_ALEN) == 0))
 205                         return -1;
 206         }
 207
 208         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 209         if (!p) {
 210                 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
 211                 return 0;
 212         }
 213         p->seqnum = seqnum;
 214         p->exp_time = jiffies + RMC_TIMEOUT;
 215         memcpy(p->sa, sa, ETH_ALEN);
 216         list_add(&p->list, &rmc->bucket[idx].list);
 217         return 0;
 218 }
 219
 220 void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 221 {
 222         struct ieee80211_local *local = sdata->local;
 223         struct ieee80211_supported_band *sband;
 224         u8 *pos;
 225         int len, i, rate;
 226         u8 neighbors;
 227
 228         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 229         len = sband->n_bitrates;
 230         if (len > 8)
 231                 len = 8;
 232         pos = skb_put(skb, len + 2);
 233         *pos++ = WLAN_EID_SUPP_RATES;
 234         *pos++ = len;
 235         for (i = 0; i < len; i++) {
 236                 rate = sband->bitrates[i].bitrate;
 237                 *pos++ = (u8) (rate / 5);
 238         }
 239
 240         if (sband->n_bitrates > len) {
 241                 pos = skb_put(skb, sband->n_bitrates - len + 2);
 242                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 243                 *pos++ = sband->n_bitrates - len;
 244                 for (i = len; i < sband->n_bitrates; i++) {
 245                         rate = sband->bitrates[i].bitrate;
 246                         *pos++ = (u8) (rate / 5);
 247                 }
 248         }
 249
 250         if (sband->band == IEEE80211_BAND_2GHZ) {
 251                 pos = skb_put(skb, 2 + 1);
 252                 *pos++ = WLAN_EID_DS_PARAMS;
 253                 *pos++ = 1;
 254                 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
 255         }
 256
 257         pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
 258         *pos++ = WLAN_EID_MESH_ID;
 259         *pos++ = sdata->u.mesh.mesh_id_len;
 260         if (sdata->u.mesh.mesh_id_len)
 261                 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
 262
 263         pos = skb_put(skb, 2 + IEEE80211_MESH_CONFIG_LEN);
 264         *pos++ = WLAN_EID_MESH_CONFIG;
 265         *pos++ = IEEE80211_MESH_CONFIG_LEN;
 266
 267         /* Active path selection protocol ID */
 268         *pos++ = sdata->u.mesh.mesh_pp_id;
 269
 270         /* Active path selection metric ID   */
 271         *pos++ = sdata->u.mesh.mesh_pm_id;
 272
 273         /* Congestion control mode identifier */
 274         *pos++ = sdata->u.mesh.mesh_cc_id;
 275
 276         /* Synchronization protocol identifier */
 277         *pos++ = sdata->u.mesh.mesh_sp_id;
 278
 279         /* Authentication Protocol identifier */
 280         *pos++ = sdata->u.mesh.mesh_auth_id;
 281
 282         /* Mesh Formation Info - number of neighbors */
 283         neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
 284         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 285         neighbors = (neighbors > 15) ? 15 : neighbors;
 286         *pos++ = neighbors << 1;
 287
 288         /* Mesh capability */
 289         sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
 290         *pos = MESHCONF_CAPAB_FORWARDING;
 291         *pos++ |= sdata->u.mesh.accepting_plinks ?
 292             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 293         *pos++ = 0x00;
 294
 295         return;
 296 }
 297
 298 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
 299 {
 300         /* Use last four bytes of hw addr and interface index as hash index */
 301         return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
 302                 & tbl->hash_mask;
 303 }
 304
 305 struct mesh_table *mesh_table_alloc(int size_order)
 306 {
 307         int i;
 308         struct mesh_table *newtbl;
 309
 310         newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
 311         if (!newtbl)
 312                 return NULL;
 313
 314         newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
 315                         (1 << size_order), GFP_KERNEL);
 316
 317         if (!newtbl->hash_buckets) {
 318                 kfree(newtbl);
 319                 return NULL;
 320         }
 321
 322         newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
 323                         (1 << size_order), GFP_KERNEL);
 324         if (!newtbl->hashwlock) {
 325                 kfree(newtbl->hash_buckets);
 326                 kfree(newtbl);
 327                 return NULL;
 328         }
 329
 330         newtbl->size_order = size_order;
 331         newtbl->hash_mask = (1 << size_order) - 1;
 332         atomic_set(&newtbl->entries,  0);
 333         get_random_bytes(&newtbl->hash_rnd,
 334                         sizeof(newtbl->hash_rnd));
 335         for (i = 0; i <= newtbl->hash_mask; i++)
 336                 spin_lock_init(&newtbl->hashwlock[i]);
 337
 338         return newtbl;
 339 }
 340
 341
 342 static void ieee80211_mesh_path_timer(unsigned long data)
 343 {
 344         struct ieee80211_sub_if_data *sdata =
 345                 (struct ieee80211_sub_if_data *) data;
 346         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 347         struct ieee80211_local *local = sdata->local;
 348
 349         if (local->quiescing) {
 350                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 351                 return;
 352         }
 353
 354         ieee80211_queue_work(&local->hw, &ifmsh->work);
 355 }
 356
 357 /**
 358  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 359  * @hdr:        802.11 frame header
 360  * @fc:         frame control field
 361  * @meshda:     destination address in the mesh
 362  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 363  *              locally originated.
 364  *
 365  * Return the length of the 802.11 (does not include a mesh control header)
 366  */
 367 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, char
 368                 *meshda, char *meshsa) {
 369         if (is_multicast_ether_addr(meshda)) {
 370                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 371                 /* DA TA SA */
 372                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 373                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 374                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 375                 return 24;
 376         } else {
 377                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
 378                                 IEEE80211_FCTL_TODS);
 379                 /* RA TA DA SA */
 380                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 381                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 382                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 383                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 384                 return 30;
 385         }
 386 }
 387
 388 /**
 389  * ieee80211_new_mesh_header - create a new mesh header
 390  * @meshhdr:    uninitialized mesh header
 391  * @sdata:      mesh interface to be used
 392  * @addr4:      addr4 of the mesh frame (1st in ae header)
 393  *              may be NULL
 394  * @addr5:      addr5 of the mesh frame (1st or 2nd in ae header)
 395  *              may be NULL unless addr6 is present
 396  * @addr6:      addr6 of the mesh frame (2nd or 3rd in ae header)
 397  *              may be NULL unless addr5 is present
 398  *
 399  * Return the header length.
 400  */
 401 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 402                 struct ieee80211_sub_if_data *sdata, char *addr4,
 403                 char *addr5, char *addr6)
 404 {
 405         int aelen = 0;
 406         memset(meshhdr, 0, sizeof(meshhdr));
 407         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 408         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 409         sdata->u.mesh.mesh_seqnum++;
 410         if (addr4) {
 411                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 412                 aelen += ETH_ALEN;
 413                 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
 414         }
 415         if (addr5 && addr6) {
 416                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 417                 aelen += 2 * ETH_ALEN;
 418                 if (!addr4) {
 419                         memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
 420                         memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 421                 } else {
 422                         memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
 423                         memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
 424                 }
 425         }
 426         return 6 + aelen;
 427 }
 428
 429 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 430                            struct ieee80211_if_mesh *ifmsh)
 431 {
 432         bool free_plinks;
 433
 434 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 435         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 436                sdata->dev->name);
 437 #endif
 438
 439         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 440         mesh_path_expire(sdata);
 441
 442         free_plinks = mesh_plink_availables(sdata);
 443         if (free_plinks != sdata->u.mesh.accepting_plinks)
 444                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 445
 446         mod_timer(&ifmsh->housekeeping_timer,
 447                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 448 }
 449
 450 #ifdef CONFIG_PM
 451 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 452 {
 453         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 454
 455         /* might restart the timer but that doesn't matter */
 456         cancel_work_sync(&ifmsh->work);
 457
 458         /* use atomic bitops in case both timers fire at the same time */
 459
 460         if (del_timer_sync(&ifmsh->housekeeping_timer))
 461                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 462         if (del_timer_sync(&ifmsh->mesh_path_timer))
 463                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 464 }
 465
 466 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 467 {
 468         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 469
 470         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 471                 add_timer(&ifmsh->housekeeping_timer);
 472         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 473                 add_timer(&ifmsh->mesh_path_timer);
 474 }
 475 #endif
 476
 477 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 478 {
 479         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 480         struct ieee80211_local *local = sdata->local;
 481
 482         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 483         ieee80211_queue_work(&local->hw, &ifmsh->work);
 484         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 485         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 486                                                 BSS_CHANGED_BEACON_ENABLED |
 487                                                 BSS_CHANGED_BEACON_INT);
 488 }
 489
 490 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 491 {
 492         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 493         /*
 494          * If the timer fired while we waited for it, it will have
 495          * requeued the work. Now the work will be running again
 496          * but will not rearm the timer again because it checks
 497          * whether the interface is running, which, at this point,
 498          * it no longer is.
 499          */
 500         cancel_work_sync(&sdata->u.mesh.work);
 501
 502         /*
 503          * When we get here, the interface is marked down.
 504          * Call synchronize_rcu() to wait for the RX path
 505          * should it be using the interface and enqueuing
 506          * frames at this very time on another CPU.
 507          */
 508         rcu_barrier(); /* Wait for RX path and call_rcu()'s */
 509         skb_queue_purge(&sdata->u.mesh.skb_queue);
 510 }
 511
 512 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 513                                         u16 stype,
 514                                         struct ieee80211_mgmt *mgmt,
 515                                         size_t len,
 516                                         struct ieee80211_rx_status *rx_status)
 517 {
 518         struct ieee80211_local *local = sdata->local;
 519         struct ieee802_11_elems elems;
 520         struct ieee80211_channel *channel;
 521         u32 supp_rates = 0;
 522         size_t baselen;
 523         int freq;
 524         enum ieee80211_band band = rx_status->band;
 525
 526         /* ignore ProbeResp to foreign address */
 527         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 528             compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
 529                 return;
 530
 531         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 532         if (baselen > len)
 533                 return;
 534
 535         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 536                                &elems);
 537
 538         if (elems.ds_params && elems.ds_params_len == 1)
 539                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
 540         else
 541                 freq = rx_status->freq;
 542
 543         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 544
 545         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 546                 return;
 547
 548         if (elems.mesh_id && elems.mesh_config &&
 549             mesh_matches_local(&elems, sdata)) {
 550                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
 551
 552                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
 553                                       mesh_peer_accepts_plinks(&elems));
 554         }
 555 }
 556
 557 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 558                                           struct ieee80211_mgmt *mgmt,
 559                                           size_t len,
 560                                           struct ieee80211_rx_status *rx_status)
 561 {
 562         switch (mgmt->u.action.category) {
 563         case MESH_PLINK_CATEGORY:
 564                 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 565                 break;
 566         case MESH_PATH_SEL_CATEGORY:
 567                 mesh_rx_path_sel_frame(sdata, mgmt, len);
 568                 break;
 569         }
 570 }
 571
 572 static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 573                                           struct sk_buff *skb)
 574 {
 575         struct ieee80211_rx_status *rx_status;
 576         struct ieee80211_if_mesh *ifmsh;
 577         struct ieee80211_mgmt *mgmt;
 578         u16 stype;
 579
 580         ifmsh = &sdata->u.mesh;
 581
 582         rx_status = IEEE80211_SKB_RXCB(skb);
 583         mgmt = (struct ieee80211_mgmt *) skb->data;
 584         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 585
 586         switch (stype) {
 587         case IEEE80211_STYPE_PROBE_RESP:
 588         case IEEE80211_STYPE_BEACON:
 589                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 590                                             rx_status);
 591                 break;
 592         case IEEE80211_STYPE_ACTION:
 593                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 594                 break;
 595         }
 596
 597         kfree_skb(skb);
 598 }
 599
 600 static void ieee80211_mesh_work(struct work_struct *work)
 601 {
 602         struct ieee80211_sub_if_data *sdata =
 603                 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
 604         struct ieee80211_local *local = sdata->local;
 605         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 606         struct sk_buff *skb;
 607
 608         if (!netif_running(sdata->dev))
 609                 return;
 610
 611         if (local->scanning)
 612                 return;
 613
 614         while ((skb = skb_dequeue(&ifmsh->skb_queue)))
 615                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 616
 617         if (ifmsh->preq_queue_len &&
 618             time_after(jiffies,
 619                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 620                 mesh_path_start_discovery(sdata);
 621
 622         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 623                 mesh_mpath_table_grow();
 624
 625         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 626                 mesh_mpp_table_grow();
 627
 628         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 629                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 630 }
 631
 632 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 633 {
 634         struct ieee80211_sub_if_data *sdata;
 635
 636         rcu_read_lock();
 637         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 638                 if (ieee80211_vif_is_mesh(&sdata->vif))
 639                         ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
 640         rcu_read_unlock();
 641 }
 642
 643 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 644 {
 645         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 646
 647         INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
 648         setup_timer(&ifmsh->housekeeping_timer,
 649                     ieee80211_mesh_housekeeping_timer,
 650                     (unsigned long) sdata);
 651         skb_queue_head_init(&sdata->u.mesh.skb_queue);
 652
 653         ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
 654         ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
 655         ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
 656         ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
 657         ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
 658         ifmsh->mshcfg.auto_open_plinks = true;
 659         ifmsh->mshcfg.dot11MeshMaxPeerLinks =
 660                 MESH_MAX_ESTAB_PLINKS;
 661         ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
 662                 MESH_PATH_TIMEOUT;
 663         ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
 664                 MESH_PREQ_MIN_INT;
 665         ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
 666                 MESH_DIAM_TRAVERSAL_TIME;
 667         ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
 668                 MESH_MAX_PREQ_RETRIES;
 669         ifmsh->mshcfg.path_refresh_time =
 670                 MESH_PATH_REFRESH_TIME;
 671         ifmsh->mshcfg.min_discovery_timeout =
 672                 MESH_MIN_DISCOVERY_TIMEOUT;
 673         ifmsh->accepting_plinks = true;
 674         ifmsh->preq_id = 0;
 675         ifmsh->sn = 0;
 676         atomic_set(&ifmsh->mpaths, 0);
 677         mesh_rmc_init(sdata);
 678         ifmsh->last_preq = jiffies;
 679         /* Allocate all mesh structures when creating the first mesh interface. */
 680         if (!mesh_allocated)
 681                 ieee80211s_init();
 682         mesh_ids_set_default(ifmsh);
 683         setup_timer(&ifmsh->mesh_path_timer,
 684                     ieee80211_mesh_path_timer,
 685                     (unsigned long) sdata);
 686         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 687         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 688 }
 689
 690 ieee80211_rx_result
 691 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 692 {
 693         struct ieee80211_local *local = sdata->local;
 694         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 695         struct ieee80211_mgmt *mgmt;
 696         u16 fc;
 697
 698         if (skb->len < 24)
 699                 return RX_DROP_MONITOR;
 700
 701         mgmt = (struct ieee80211_mgmt *) skb->data;
 702         fc = le16_to_cpu(mgmt->frame_control);
 703
 704         switch (fc & IEEE80211_FCTL_STYPE) {
 705         case IEEE80211_STYPE_ACTION:
 706                 if (skb->len < IEEE80211_MIN_ACTION_SIZE)
 707                         return RX_DROP_MONITOR;
 708                 /* fall through */
 709         case IEEE80211_STYPE_PROBE_RESP:
 710         case IEEE80211_STYPE_BEACON:
 711                 skb_queue_tail(&ifmsh->skb_queue, skb);
 712                 ieee80211_queue_work(&local->hw, &ifmsh->work);
 713                 return RX_QUEUED;
 714         }
 715
 716         return RX_CONTINUE;
 717 }