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 void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
 128 {
 129         sta->mesh_pp_id = 0;    /* HWMP */
 130         sta->mesh_pm_id = 0;    /* Airtime */
 131         sta->mesh_cc_id = 0;    /* Disabled */
 132         sta->mesh_sp_id = 0;    /* Neighbor Offset */
 133         sta->mesh_auth_id = 0;  /* Disabled */
 134 }
 135
 136 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 137 {
 138         int i;
 139
 140         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 141         if (!sdata->u.mesh.rmc)
 142                 return -ENOMEM;
 143         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 144         for (i = 0; i < RMC_BUCKETS; i++)
 145                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
 146         return 0;
 147 }
 148
 149 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 150 {
 151         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 152         struct rmc_entry *p, *n;
 153         int i;
 154
 155         if (!sdata->u.mesh.rmc)
 156                 return;
 157
 158         for (i = 0; i < RMC_BUCKETS; i++)
 159                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
 160                         list_del(&p->list);
 161                         kmem_cache_free(rm_cache, p);
 162                 }
 163
 164         kfree(rmc);
 165         sdata->u.mesh.rmc = NULL;
 166 }
 167
 168 /**
 169  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 170  *
 171  * @sa:         source address
 172  * @mesh_hdr:   mesh_header
 173  *
 174  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 175  *
 176  * Checks using the source address and the mesh sequence number if we have
 177  * received this frame lately. If the frame is not in the cache, it is added to
 178  * it.
 179  */
 180 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 181                    struct ieee80211_sub_if_data *sdata)
 182 {
 183         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 184         u32 seqnum = 0;
 185         int entries = 0;
 186         u8 idx;
 187         struct rmc_entry *p, *n;
 188
 189         /* Don't care about endianness since only match matters */
 190         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 191         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 192         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
 193                 ++entries;
 194                 if (time_after(jiffies, p->exp_time) ||
 195                                 (entries == RMC_QUEUE_MAX_LEN)) {
 196                         list_del(&p->list);
 197                         kmem_cache_free(rm_cache, p);
 198                         --entries;
 199                 } else if ((seqnum == p->seqnum) &&
 200                            (memcmp(sa, p->sa, ETH_ALEN) == 0))
 201                         return -1;
 202         }
 203
 204         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 205         if (!p) {
 206                 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
 207                 return 0;
 208         }
 209         p->seqnum = seqnum;
 210         p->exp_time = jiffies + RMC_TIMEOUT;
 211         memcpy(p->sa, sa, ETH_ALEN);
 212         list_add(&p->list, &rmc->bucket[idx].list);
 213         return 0;
 214 }
 215
 216 void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 217 {
 218         struct ieee80211_local *local = sdata->local;
 219         struct ieee80211_supported_band *sband;
 220         u8 *pos;
 221         int len, i, rate;
 222         u8 neighbors;
 223
 224         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 225         len = sband->n_bitrates;
 226         if (len > 8)
 227                 len = 8;
 228         pos = skb_put(skb, len + 2);
 229         *pos++ = WLAN_EID_SUPP_RATES;
 230         *pos++ = len;
 231         for (i = 0; i < len; i++) {
 232                 rate = sband->bitrates[i].bitrate;
 233                 *pos++ = (u8) (rate / 5);
 234         }
 235
 236         if (sband->n_bitrates > len) {
 237                 pos = skb_put(skb, sband->n_bitrates - len + 2);
 238                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 239                 *pos++ = sband->n_bitrates - len;
 240                 for (i = len; i < sband->n_bitrates; i++) {
 241                         rate = sband->bitrates[i].bitrate;
 242                         *pos++ = (u8) (rate / 5);
 243                 }
 244         }
 245
 246         if (sband->band == IEEE80211_BAND_2GHZ) {
 247                 pos = skb_put(skb, 2 + 1);
 248                 *pos++ = WLAN_EID_DS_PARAMS;
 249                 *pos++ = 1;
 250                 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
 251         }
 252
 253         pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
 254         *pos++ = WLAN_EID_MESH_ID;
 255         *pos++ = sdata->u.mesh.mesh_id_len;
 256         if (sdata->u.mesh.mesh_id_len)
 257                 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
 258
 259         pos = skb_put(skb, 2 + sizeof(struct ieee80211_meshconf_ie));
 260         *pos++ = WLAN_EID_MESH_CONFIG;
 261         *pos++ = sizeof(struct ieee80211_meshconf_ie);
 262
 263         /* Active path selection protocol ID */
 264         *pos++ = sdata->u.mesh.mesh_pp_id;
 265
 266         /* Active path selection metric ID   */
 267         *pos++ = sdata->u.mesh.mesh_pm_id;
 268
 269         /* Congestion control mode identifier */
 270         *pos++ = sdata->u.mesh.mesh_cc_id;
 271
 272         /* Synchronization protocol identifier */
 273         *pos++ = sdata->u.mesh.mesh_sp_id;
 274
 275         /* Authentication Protocol identifier */
 276         *pos++ = sdata->u.mesh.mesh_auth_id;
 277
 278         /* Mesh Formation Info - number of neighbors */
 279         neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
 280         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 281         neighbors = (neighbors > 15) ? 15 : neighbors;
 282         *pos++ = neighbors << 1;
 283
 284         /* Mesh capability */
 285         sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
 286         *pos = MESHCONF_CAPAB_FORWARDING;
 287         *pos++ |= sdata->u.mesh.accepting_plinks ?
 288             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 289         *pos++ = 0x00;
 290 }
 291
 292 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
 293 {
 294         /* Use last four bytes of hw addr and interface index as hash index */
 295         return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
 296                 & tbl->hash_mask;
 297 }
 298
 299 struct mesh_table *mesh_table_alloc(int size_order)
 300 {
 301         int i;
 302         struct mesh_table *newtbl;
 303
 304         newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
 305         if (!newtbl)
 306                 return NULL;
 307
 308         newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
 309                         (1 << size_order), GFP_KERNEL);
 310
 311         if (!newtbl->hash_buckets) {
 312                 kfree(newtbl);
 313                 return NULL;
 314         }
 315
 316         newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
 317                         (1 << size_order), GFP_KERNEL);
 318         if (!newtbl->hashwlock) {
 319                 kfree(newtbl->hash_buckets);
 320                 kfree(newtbl);
 321                 return NULL;
 322         }
 323
 324         newtbl->size_order = size_order;
 325         newtbl->hash_mask = (1 << size_order) - 1;
 326         atomic_set(&newtbl->entries,  0);
 327         get_random_bytes(&newtbl->hash_rnd,
 328                         sizeof(newtbl->hash_rnd));
 329         for (i = 0; i <= newtbl->hash_mask; i++)
 330                 spin_lock_init(&newtbl->hashwlock[i]);
 331
 332         return newtbl;
 333 }
 334
 335
 336 static void ieee80211_mesh_path_timer(unsigned long data)
 337 {
 338         struct ieee80211_sub_if_data *sdata =
 339                 (struct ieee80211_sub_if_data *) data;
 340         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 341         struct ieee80211_local *local = sdata->local;
 342
 343         if (local->quiescing) {
 344                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 345                 return;
 346         }
 347
 348         ieee80211_queue_work(&local->hw, &sdata->work);
 349 }
 350
 351 static void ieee80211_mesh_path_root_timer(unsigned long data)
 352 {
 353         struct ieee80211_sub_if_data *sdata =
 354                 (struct ieee80211_sub_if_data *) data;
 355         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 356         struct ieee80211_local *local = sdata->local;
 357
 358         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 359
 360         if (local->quiescing) {
 361                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 362                 return;
 363         }
 364
 365         ieee80211_queue_work(&local->hw, &sdata->work);
 366 }
 367
 368 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 369 {
 370         if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
 371                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 372         else {
 373                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 374                 /* stop running timer */
 375                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 376         }
 377 }
 378
 379 /**
 380  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 381  * @hdr:        802.11 frame header
 382  * @fc:         frame control field
 383  * @meshda:     destination address in the mesh
 384  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 385  *              locally originated.
 386  *
 387  * Return the length of the 802.11 (does not include a mesh control header)
 388  */
 389 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 390                                   const u8 *meshda, const u8 *meshsa)
 391 {
 392         if (is_multicast_ether_addr(meshda)) {
 393                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 394                 /* DA TA SA */
 395                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 396                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 397                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 398                 return 24;
 399         } else {
 400                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
 401                                 IEEE80211_FCTL_TODS);
 402                 /* RA TA DA SA */
 403                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 404                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 405                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 406                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 407                 return 30;
 408         }
 409 }
 410
 411 /**
 412  * ieee80211_new_mesh_header - create a new mesh header
 413  * @meshhdr:    uninitialized mesh header
 414  * @sdata:      mesh interface to be used
 415  * @addr4:      addr4 of the mesh frame (1st in ae header)
 416  *              may be NULL
 417  * @addr5:      addr5 of the mesh frame (1st or 2nd in ae header)
 418  *              may be NULL unless addr6 is present
 419  * @addr6:      addr6 of the mesh frame (2nd or 3rd in ae header)
 420  *              may be NULL unless addr5 is present
 421  *
 422  * Return the header length.
 423  */
 424 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 425                 struct ieee80211_sub_if_data *sdata, char *addr4,
 426                 char *addr5, char *addr6)
 427 {
 428         int aelen = 0;
 429         memset(meshhdr, 0, sizeof(*meshhdr));
 430         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 431         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 432         sdata->u.mesh.mesh_seqnum++;
 433         if (addr4) {
 434                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 435                 aelen += ETH_ALEN;
 436                 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
 437         }
 438         if (addr5 && addr6) {
 439                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 440                 aelen += 2 * ETH_ALEN;
 441                 if (!addr4) {
 442                         memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
 443                         memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 444                 } else {
 445                         memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
 446                         memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
 447                 }
 448         }
 449         return 6 + aelen;
 450 }
 451
 452 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 453                            struct ieee80211_if_mesh *ifmsh)
 454 {
 455         bool free_plinks;
 456
 457 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 458         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 459                sdata->name);
 460 #endif
 461
 462         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 463         mesh_path_expire(sdata);
 464
 465         free_plinks = mesh_plink_availables(sdata);
 466         if (free_plinks != sdata->u.mesh.accepting_plinks)
 467                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 468
 469         mod_timer(&ifmsh->housekeeping_timer,
 470                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 471 }
 472
 473 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 474 {
 475         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 476
 477         mesh_path_tx_root_frame(sdata);
 478         mod_timer(&ifmsh->mesh_path_root_timer,
 479                   round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL));
 480 }
 481
 482 #ifdef CONFIG_PM
 483 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 484 {
 485         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 486
 487         /* use atomic bitops in case both timers fire at the same time */
 488
 489         if (del_timer_sync(&ifmsh->housekeeping_timer))
 490                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 491         if (del_timer_sync(&ifmsh->mesh_path_timer))
 492                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 493         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 494                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 495 }
 496
 497 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 498 {
 499         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 500
 501         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 502                 add_timer(&ifmsh->housekeeping_timer);
 503         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 504                 add_timer(&ifmsh->mesh_path_timer);
 505         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 506                 add_timer(&ifmsh->mesh_path_root_timer);
 507         ieee80211_mesh_root_setup(ifmsh);
 508 }
 509 #endif
 510
 511 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 512 {
 513         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 514         struct ieee80211_local *local = sdata->local;
 515
 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         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 528         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 529         /*
 530          * If the timer fired while we waited for it, it will have
 531          * requeued the work. Now the work will be running again
 532          * but will not rearm the timer again because it checks
 533          * whether the interface is running, which, at this point,
 534          * it no longer is.
 535          */
 536         cancel_work_sync(&sdata->work);
 537 }
 538
 539 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 540                                         u16 stype,
 541                                         struct ieee80211_mgmt *mgmt,
 542                                         size_t len,
 543                                         struct ieee80211_rx_status *rx_status)
 544 {
 545         struct ieee80211_local *local = sdata->local;
 546         struct ieee802_11_elems elems;
 547         struct ieee80211_channel *channel;
 548         u32 supp_rates = 0;
 549         size_t baselen;
 550         int freq;
 551         enum ieee80211_band band = rx_status->band;
 552
 553         /* ignore ProbeResp to foreign address */
 554         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 555             compare_ether_addr(mgmt->da, sdata->vif.addr))
 556                 return;
 557
 558         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 559         if (baselen > len)
 560                 return;
 561
 562         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 563                                &elems);
 564
 565         if (elems.ds_params && elems.ds_params_len == 1)
 566                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
 567         else
 568                 freq = rx_status->freq;
 569
 570         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 571
 572         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 573                 return;
 574
 575         if (elems.mesh_id && elems.mesh_config &&
 576             mesh_matches_local(&elems, sdata)) {
 577                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
 578
 579                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
 580                                       mesh_peer_accepts_plinks(&elems));
 581         }
 582 }
 583
 584 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 585                                           struct ieee80211_mgmt *mgmt,
 586                                           size_t len,
 587                                           struct ieee80211_rx_status *rx_status)
 588 {
 589         switch (mgmt->u.action.category) {
 590         case WLAN_CATEGORY_MESH_PLINK:
 591                 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 592                 break;
 593         case WLAN_CATEGORY_MESH_PATH_SEL:
 594                 mesh_rx_path_sel_frame(sdata, mgmt, len);
 595                 break;
 596         }
 597 }
 598
 599 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 600                                    struct sk_buff *skb)
 601 {
 602         struct ieee80211_rx_status *rx_status;
 603         struct ieee80211_if_mesh *ifmsh;
 604         struct ieee80211_mgmt *mgmt;
 605         u16 stype;
 606
 607         ifmsh = &sdata->u.mesh;
 608
 609         rx_status = IEEE80211_SKB_RXCB(skb);
 610         mgmt = (struct ieee80211_mgmt *) skb->data;
 611         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 612
 613         switch (stype) {
 614         case IEEE80211_STYPE_PROBE_RESP:
 615         case IEEE80211_STYPE_BEACON:
 616                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 617                                             rx_status);
 618                 break;
 619         case IEEE80211_STYPE_ACTION:
 620                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 621                 break;
 622         }
 623 }
 624
 625 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 626 {
 627         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 628
 629         if (ifmsh->preq_queue_len &&
 630             time_after(jiffies,
 631                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 632                 mesh_path_start_discovery(sdata);
 633
 634         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 635                 mesh_mpath_table_grow();
 636
 637         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 638                 mesh_mpp_table_grow();
 639
 640         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 641                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 642
 643         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 644                 ieee80211_mesh_rootpath(sdata);
 645 }
 646
 647 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 648 {
 649         struct ieee80211_sub_if_data *sdata;
 650
 651         rcu_read_lock();
 652         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 653                 if (ieee80211_vif_is_mesh(&sdata->vif))
 654                         ieee80211_queue_work(&local->hw, &sdata->work);
 655         rcu_read_unlock();
 656 }
 657
 658 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 659 {
 660         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 661
 662         setup_timer(&ifmsh->housekeeping_timer,
 663                     ieee80211_mesh_housekeeping_timer,
 664                     (unsigned long) sdata);
 665
 666         ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
 667         ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
 668         ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
 669         ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
 670         ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
 671         ifmsh->mshcfg.auto_open_plinks = true;
 672         ifmsh->mshcfg.dot11MeshMaxPeerLinks =
 673                 MESH_MAX_ESTAB_PLINKS;
 674         ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
 675                 MESH_PATH_TIMEOUT;
 676         ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
 677                 MESH_PREQ_MIN_INT;
 678         ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
 679                 MESH_DIAM_TRAVERSAL_TIME;
 680         ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
 681                 MESH_MAX_PREQ_RETRIES;
 682         ifmsh->mshcfg.path_refresh_time =
 683                 MESH_PATH_REFRESH_TIME;
 684         ifmsh->mshcfg.min_discovery_timeout =
 685                 MESH_MIN_DISCOVERY_TIMEOUT;
 686         ifmsh->accepting_plinks = true;
 687         ifmsh->preq_id = 0;
 688         ifmsh->sn = 0;
 689         atomic_set(&ifmsh->mpaths, 0);
 690         mesh_rmc_init(sdata);
 691         ifmsh->last_preq = jiffies;
 692         /* Allocate all mesh structures when creating the first mesh interface. */
 693         if (!mesh_allocated)
 694                 ieee80211s_init();
 695         mesh_ids_set_default(ifmsh);
 696         setup_timer(&ifmsh->mesh_path_timer,
 697                     ieee80211_mesh_path_timer,
 698                     (unsigned long) sdata);
 699         setup_timer(&ifmsh->mesh_path_root_timer,
 700                     ieee80211_mesh_path_root_timer,
 701                     (unsigned long) sdata);
 702         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 703         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 704 }