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 TMR_RUNNING_HK  0
  17 #define TMR_RUNNING_MP  1
  18 #define TMR_RUNNING_MPR 2
  19
  20 int mesh_allocated;
  21 static struct kmem_cache *rm_cache;
  22
  23 #ifdef CONFIG_MAC80211_MESH
  24 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  25 {
  26         return (mgmt->u.action.u.mesh_action.action_code ==
  27                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
  28 }
  29 #else
  30 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  31 { return false; }
  32 #endif
  33
  34 void ieee80211s_init(void)
  35 {
  36         mesh_pathtbl_init();
  37         mesh_allocated = 1;
  38         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  39                                      0, 0, NULL);
  40 }
  41
  42 void ieee80211s_stop(void)
  43 {
  44         mesh_pathtbl_unregister();
  45         kmem_cache_destroy(rm_cache);
  46 }
  47
  48 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  49 {
  50         struct ieee80211_sub_if_data *sdata = (void *) data;
  51         struct ieee80211_local *local = sdata->local;
  52         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  53
  54         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  55
  56         if (local->quiescing) {
  57                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
  58                 return;
  59         }
  60
  61         ieee80211_queue_work(&local->hw, &sdata->work);
  62 }
  63
  64 /**
  65  * mesh_matches_local - check if the config of a mesh point matches ours
  66  *
  67  * @sdata: local mesh subif
  68  * @ie: information elements of a management frame from the mesh peer
  69  *
  70  * This function checks if the mesh configuration of a mesh point matches the
  71  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  72  */
  73 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
  74                         struct ieee802_11_elems *ie)
  75 {
  76         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  77         struct ieee80211_local *local = sdata->local;
  78         u32 basic_rates = 0;
  79         enum nl80211_channel_type sta_channel_type = NL80211_CHAN_NO_HT;
  80
  81         /*
  82          * As support for each feature is added, check for matching
  83          * - On mesh config capabilities
  84          *   - Power Save Support En
  85          *   - Sync support enabled
  86          *   - Sync support active
  87          *   - Sync support required from peer
  88          *   - MDA enabled
  89          * - Power management control on fc
  90          */
  91         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
  92              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  93              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  94              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  95              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  96              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  97              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  98                 goto mismatch;
  99
 100         ieee80211_sta_get_rates(local, ie, local->oper_channel->band,
 101                                 &basic_rates);
 102
 103         if (sdata->vif.bss_conf.basic_rates != basic_rates)
 104                 goto mismatch;
 105
 106         if (ie->ht_operation)
 107                 sta_channel_type =
 108                         ieee80211_ht_oper_to_channel_type(ie->ht_operation);
 109
 110         /* Disallow HT40+/- mismatch */
 111         if (ie->ht_operation &&
 112             local->_oper_channel_type > NL80211_CHAN_HT20 &&
 113             sta_channel_type > NL80211_CHAN_HT20 &&
 114             local->_oper_channel_type != sta_channel_type)
 115                 goto mismatch;
 116
 117         return true;
 118 mismatch:
 119         return false;
 120 }
 121
 122 /**
 123  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 124  *
 125  * @ie: information elements of a management frame from the mesh peer
 126  */
 127 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 128 {
 129         return (ie->mesh_config->meshconf_cap &
 130             MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 131 }
 132
 133 /**
 134  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
 135  *
 136  * @sdata: mesh interface in which mesh beacons are going to be updated
 137  */
 138 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 139 {
 140         bool free_plinks;
 141
 142         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 143          * the mesh interface might be able to establish plinks with peers that
 144          * are already on the table but are not on PLINK_ESTAB state. However,
 145          * in general the mesh interface is not accepting peer link requests
 146          * from new peers, and that must be reflected in the beacon
 147          */
 148         free_plinks = mesh_plink_availables(sdata);
 149
 150         if (free_plinks != sdata->u.mesh.accepting_plinks)
 151                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
 152 }
 153
 154 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 155 {
 156         int i;
 157
 158         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 159         if (!sdata->u.mesh.rmc)
 160                 return -ENOMEM;
 161         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 162         for (i = 0; i < RMC_BUCKETS; i++)
 163                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
 164         return 0;
 165 }
 166
 167 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 168 {
 169         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 170         struct rmc_entry *p, *n;
 171         int i;
 172
 173         if (!sdata->u.mesh.rmc)
 174                 return;
 175
 176         for (i = 0; i < RMC_BUCKETS; i++)
 177                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
 178                         list_del(&p->list);
 179                         kmem_cache_free(rm_cache, p);
 180                 }
 181
 182         kfree(rmc);
 183         sdata->u.mesh.rmc = NULL;
 184 }
 185
 186 /**
 187  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 188  *
 189  * @sa:         source address
 190  * @mesh_hdr:   mesh_header
 191  *
 192  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 193  *
 194  * Checks using the source address and the mesh sequence number if we have
 195  * received this frame lately. If the frame is not in the cache, it is added to
 196  * it.
 197  */
 198 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 199                    struct ieee80211_sub_if_data *sdata)
 200 {
 201         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 202         u32 seqnum = 0;
 203         int entries = 0;
 204         u8 idx;
 205         struct rmc_entry *p, *n;
 206
 207         /* Don't care about endianness since only match matters */
 208         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 209         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 210         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
 211                 ++entries;
 212                 if (time_after(jiffies, p->exp_time) ||
 213                                 (entries == RMC_QUEUE_MAX_LEN)) {
 214                         list_del(&p->list);
 215                         kmem_cache_free(rm_cache, p);
 216                         --entries;
 217                 } else if ((seqnum == p->seqnum) &&
 218                            (ether_addr_equal(sa, p->sa)))
 219                         return -1;
 220         }
 221
 222         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 223         if (!p)
 224                 return 0;
 225
 226         p->seqnum = seqnum;
 227         p->exp_time = jiffies + RMC_TIMEOUT;
 228         memcpy(p->sa, sa, ETH_ALEN);
 229         list_add(&p->list, &rmc->bucket[idx].list);
 230         return 0;
 231 }
 232
 233 int
 234 mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 235 {
 236         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 237         u8 *pos, neighbors;
 238         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 239
 240         if (skb_tailroom(skb) < 2 + meshconf_len)
 241                 return -ENOMEM;
 242
 243         pos = skb_put(skb, 2 + meshconf_len);
 244         *pos++ = WLAN_EID_MESH_CONFIG;
 245         *pos++ = meshconf_len;
 246
 247         /* Active path selection protocol ID */
 248         *pos++ = ifmsh->mesh_pp_id;
 249         /* Active path selection metric ID   */
 250         *pos++ = ifmsh->mesh_pm_id;
 251         /* Congestion control mode identifier */
 252         *pos++ = ifmsh->mesh_cc_id;
 253         /* Synchronization protocol identifier */
 254         *pos++ = ifmsh->mesh_sp_id;
 255         /* Authentication Protocol identifier */
 256         *pos++ = ifmsh->mesh_auth_id;
 257         /* Mesh Formation Info - number of neighbors */
 258         neighbors = atomic_read(&ifmsh->mshstats.estab_plinks);
 259         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 260         neighbors = (neighbors > 15) ? 15 : neighbors;
 261         *pos++ = neighbors << 1;
 262         /* Mesh capability */
 263         ifmsh->accepting_plinks = mesh_plink_availables(sdata);
 264         *pos = MESHCONF_CAPAB_FORWARDING;
 265         *pos |= ifmsh->accepting_plinks ?
 266             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 267         *pos++ |= ifmsh->adjusting_tbtt ?
 268             MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
 269         *pos++ = 0x00;
 270
 271         return 0;
 272 }
 273
 274 int
 275 mesh_add_meshid_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 276 {
 277         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 278         u8 *pos;
 279
 280         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 281                 return -ENOMEM;
 282
 283         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 284         *pos++ = WLAN_EID_MESH_ID;
 285         *pos++ = ifmsh->mesh_id_len;
 286         if (ifmsh->mesh_id_len)
 287                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 288
 289         return 0;
 290 }
 291
 292 int
 293 mesh_add_vendor_ies(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 294 {
 295         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 296         u8 offset, len;
 297         const u8 *data;
 298
 299         if (!ifmsh->ie || !ifmsh->ie_len)
 300                 return 0;
 301
 302         /* fast-forward to vendor IEs */
 303         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 304
 305         if (offset) {
 306                 len = ifmsh->ie_len - offset;
 307                 data = ifmsh->ie + offset;
 308                 if (skb_tailroom(skb) < len)
 309                         return -ENOMEM;
 310                 memcpy(skb_put(skb, len), data, len);
 311         }
 312
 313         return 0;
 314 }
 315
 316 int
 317 mesh_add_rsn_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 318 {
 319         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 320         u8 len = 0;
 321         const u8 *data;
 322
 323         if (!ifmsh->ie || !ifmsh->ie_len)
 324                 return 0;
 325
 326         /* find RSN IE */
 327         data = ifmsh->ie;
 328         while (data < ifmsh->ie + ifmsh->ie_len) {
 329                 if (*data == WLAN_EID_RSN) {
 330                         len = data[1] + 2;
 331                         break;
 332                 }
 333                 data++;
 334         }
 335
 336         if (len) {
 337                 if (skb_tailroom(skb) < len)
 338                         return -ENOMEM;
 339                 memcpy(skb_put(skb, len), data, len);
 340         }
 341
 342         return 0;
 343 }
 344
 345 int mesh_add_ds_params_ie(struct sk_buff *skb,
 346                           struct ieee80211_sub_if_data *sdata)
 347 {
 348         struct ieee80211_local *local = sdata->local;
 349         struct ieee80211_supported_band *sband;
 350         u8 *pos;
 351
 352         if (skb_tailroom(skb) < 3)
 353                 return -ENOMEM;
 354
 355         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 356         if (sband->band == IEEE80211_BAND_2GHZ) {
 357                 pos = skb_put(skb, 2 + 1);
 358                 *pos++ = WLAN_EID_DS_PARAMS;
 359                 *pos++ = 1;
 360                 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
 361         }
 362
 363         return 0;
 364 }
 365
 366 int mesh_add_ht_cap_ie(struct sk_buff *skb,
 367                        struct ieee80211_sub_if_data *sdata)
 368 {
 369         struct ieee80211_local *local = sdata->local;
 370         struct ieee80211_supported_band *sband;
 371         u8 *pos;
 372
 373         sband = local->hw.wiphy->bands[local->oper_channel->band];
 374         if (!sband->ht_cap.ht_supported ||
 375             local->_oper_channel_type == NL80211_CHAN_NO_HT)
 376                 return 0;
 377
 378         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 379                 return -ENOMEM;
 380
 381         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 382         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 383
 384         return 0;
 385 }
 386
 387 int mesh_add_ht_oper_ie(struct sk_buff *skb,
 388                         struct ieee80211_sub_if_data *sdata)
 389 {
 390         struct ieee80211_local *local = sdata->local;
 391         struct ieee80211_channel *channel = local->oper_channel;
 392         enum nl80211_channel_type channel_type = local->_oper_channel_type;
 393         struct ieee80211_supported_band *sband =
 394                                 local->hw.wiphy->bands[channel->band];
 395         struct ieee80211_sta_ht_cap *ht_cap = &sband->ht_cap;
 396         u8 *pos;
 397
 398         if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
 399                 return 0;
 400
 401         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 402                 return -ENOMEM;
 403
 404         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 405         ieee80211_ie_build_ht_oper(pos, ht_cap, channel, channel_type,
 406                                    sdata->vif.bss_conf.ht_operation_mode);
 407
 408         return 0;
 409 }
 410 static void ieee80211_mesh_path_timer(unsigned long data)
 411 {
 412         struct ieee80211_sub_if_data *sdata =
 413                 (struct ieee80211_sub_if_data *) data;
 414         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 415         struct ieee80211_local *local = sdata->local;
 416
 417         if (local->quiescing) {
 418                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 419                 return;
 420         }
 421
 422         ieee80211_queue_work(&local->hw, &sdata->work);
 423 }
 424
 425 static void ieee80211_mesh_path_root_timer(unsigned long data)
 426 {
 427         struct ieee80211_sub_if_data *sdata =
 428                 (struct ieee80211_sub_if_data *) data;
 429         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 430         struct ieee80211_local *local = sdata->local;
 431
 432         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 433
 434         if (local->quiescing) {
 435                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 436                 return;
 437         }
 438
 439         ieee80211_queue_work(&local->hw, &sdata->work);
 440 }
 441
 442 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 443 {
 444         if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
 445                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 446         else {
 447                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 448                 /* stop running timer */
 449                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 450         }
 451 }
 452
 453 /**
 454  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 455  * @hdr:        802.11 frame header
 456  * @fc:         frame control field
 457  * @meshda:     destination address in the mesh
 458  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 459  *              locally originated.
 460  *
 461  * Return the length of the 802.11 (does not include a mesh control header)
 462  */
 463 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 464                                   const u8 *meshda, const u8 *meshsa)
 465 {
 466         if (is_multicast_ether_addr(meshda)) {
 467                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 468                 /* DA TA SA */
 469                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 470                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 471                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 472                 return 24;
 473         } else {
 474                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 475                 /* RA TA DA SA */
 476                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 477                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 478                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 479                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 480                 return 30;
 481         }
 482 }
 483
 484 /**
 485  * ieee80211_new_mesh_header - create a new mesh header
 486  * @meshhdr:    uninitialized mesh header
 487  * @sdata:      mesh interface to be used
 488  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 489  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 490  *              be NULL.
 491  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 492  *              mesh frame
 493  *
 494  * Return the header length.
 495  */
 496 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 497                 struct ieee80211_sub_if_data *sdata, char *addr4or5,
 498                 char *addr6)
 499 {
 500         int aelen = 0;
 501         BUG_ON(!addr4or5 && addr6);
 502         memset(meshhdr, 0, sizeof(*meshhdr));
 503         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 504         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 505         sdata->u.mesh.mesh_seqnum++;
 506         if (addr4or5 && !addr6) {
 507                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 508                 aelen += ETH_ALEN;
 509                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 510         } else if (addr4or5 && addr6) {
 511                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 512                 aelen += 2 * ETH_ALEN;
 513                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 514                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 515         }
 516         return 6 + aelen;
 517 }
 518
 519 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 520                            struct ieee80211_if_mesh *ifmsh)
 521 {
 522         bool free_plinks;
 523
 524 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 525         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 526                sdata->name);
 527 #endif
 528
 529         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 530         mesh_path_expire(sdata);
 531
 532         free_plinks = mesh_plink_availables(sdata);
 533         if (free_plinks != sdata->u.mesh.accepting_plinks)
 534                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 535
 536         mod_timer(&ifmsh->housekeeping_timer,
 537                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 538 }
 539
 540 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 541 {
 542         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 543
 544         mesh_path_tx_root_frame(sdata);
 545         mod_timer(&ifmsh->mesh_path_root_timer,
 546                   round_jiffies(TU_TO_EXP_TIME(
 547                                   ifmsh->mshcfg.dot11MeshHWMPRannInterval)));
 548 }
 549
 550 #ifdef CONFIG_PM
 551 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 552 {
 553         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 554
 555         /* use atomic bitops in case all timers fire at the same time */
 556
 557         if (del_timer_sync(&ifmsh->housekeeping_timer))
 558                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 559         if (del_timer_sync(&ifmsh->mesh_path_timer))
 560                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 561         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 562                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 563 }
 564
 565 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 566 {
 567         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 568
 569         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 570                 add_timer(&ifmsh->housekeeping_timer);
 571         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 572                 add_timer(&ifmsh->mesh_path_timer);
 573         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 574                 add_timer(&ifmsh->mesh_path_root_timer);
 575         ieee80211_mesh_root_setup(ifmsh);
 576 }
 577 #endif
 578
 579 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 580 {
 581         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 582         struct ieee80211_local *local = sdata->local;
 583
 584         local->fif_other_bss++;
 585         /* mesh ifaces must set allmulti to forward mcast traffic */
 586         atomic_inc(&local->iff_allmultis);
 587         ieee80211_configure_filter(local);
 588
 589         ifmsh->mesh_cc_id = 0;  /* Disabled */
 590         ifmsh->mesh_auth_id = 0;        /* Disabled */
 591         /* register sync ops from extensible synchronization framework */
 592         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 593         ifmsh->adjusting_tbtt = false;
 594         ifmsh->sync_offset_clockdrift_max = 0;
 595         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 596         ieee80211_mesh_root_setup(ifmsh);
 597         ieee80211_queue_work(&local->hw, &sdata->work);
 598         sdata->vif.bss_conf.ht_operation_mode =
 599                                 ifmsh->mshcfg.ht_opmode;
 600         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 601         sdata->vif.bss_conf.basic_rates =
 602                 ieee80211_mandatory_rates(sdata->local,
 603                                           sdata->local->hw.conf.channel->band);
 604         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 605                                                 BSS_CHANGED_BEACON_ENABLED |
 606                                                 BSS_CHANGED_HT |
 607                                                 BSS_CHANGED_BASIC_RATES |
 608                                                 BSS_CHANGED_BEACON_INT);
 609 }
 610
 611 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 612 {
 613         struct ieee80211_local *local = sdata->local;
 614         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 615
 616         ifmsh->mesh_id_len = 0;
 617         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 618         sta_info_flush(local, NULL);
 619
 620         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 621         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 622         /*
 623          * If the timer fired while we waited for it, it will have
 624          * requeued the work. Now the work will be running again
 625          * but will not rearm the timer again because it checks
 626          * whether the interface is running, which, at this point,
 627          * it no longer is.
 628          */
 629         cancel_work_sync(&sdata->work);
 630
 631         local->fif_other_bss--;
 632         atomic_dec(&local->iff_allmultis);
 633         ieee80211_configure_filter(local);
 634 }
 635
 636 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 637                                         u16 stype,
 638                                         struct ieee80211_mgmt *mgmt,
 639                                         size_t len,
 640                                         struct ieee80211_rx_status *rx_status)
 641 {
 642         struct ieee80211_local *local = sdata->local;
 643         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 644         struct ieee802_11_elems elems;
 645         struct ieee80211_channel *channel;
 646         size_t baselen;
 647         int freq;
 648         enum ieee80211_band band = rx_status->band;
 649
 650         /* ignore ProbeResp to foreign address */
 651         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 652             !ether_addr_equal(mgmt->da, sdata->vif.addr))
 653                 return;
 654
 655         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 656         if (baselen > len)
 657                 return;
 658
 659         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 660                                &elems);
 661
 662         /* ignore beacons from secure mesh peers if our security is off */
 663         if (elems.rsn_len && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE)
 664                 return;
 665
 666         if (elems.ds_params && elems.ds_params_len == 1)
 667                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 668         else
 669                 freq = rx_status->freq;
 670
 671         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 672
 673         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 674                 return;
 675
 676         if (elems.mesh_id && elems.mesh_config &&
 677             mesh_matches_local(sdata, &elems))
 678                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
 679
 680         if (ifmsh->sync_ops)
 681                 ifmsh->sync_ops->rx_bcn_presp(sdata,
 682                         stype, mgmt, &elems, rx_status);
 683 }
 684
 685 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 686                                           struct ieee80211_mgmt *mgmt,
 687                                           size_t len,
 688                                           struct ieee80211_rx_status *rx_status)
 689 {
 690         switch (mgmt->u.action.category) {
 691         case WLAN_CATEGORY_SELF_PROTECTED:
 692                 switch (mgmt->u.action.u.self_prot.action_code) {
 693                 case WLAN_SP_MESH_PEERING_OPEN:
 694                 case WLAN_SP_MESH_PEERING_CLOSE:
 695                 case WLAN_SP_MESH_PEERING_CONFIRM:
 696                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 697                         break;
 698                 }
 699                 break;
 700         case WLAN_CATEGORY_MESH_ACTION:
 701                 if (mesh_action_is_path_sel(mgmt))
 702                         mesh_rx_path_sel_frame(sdata, mgmt, len);
 703                 break;
 704         }
 705 }
 706
 707 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 708                                    struct sk_buff *skb)
 709 {
 710         struct ieee80211_rx_status *rx_status;
 711         struct ieee80211_mgmt *mgmt;
 712         u16 stype;
 713
 714         rx_status = IEEE80211_SKB_RXCB(skb);
 715         mgmt = (struct ieee80211_mgmt *) skb->data;
 716         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 717
 718         switch (stype) {
 719         case IEEE80211_STYPE_PROBE_RESP:
 720         case IEEE80211_STYPE_BEACON:
 721                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 722                                             rx_status);
 723                 break;
 724         case IEEE80211_STYPE_ACTION:
 725                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 726                 break;
 727         }
 728 }
 729
 730 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 731 {
 732         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 733
 734         if (ifmsh->preq_queue_len &&
 735             time_after(jiffies,
 736                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 737                 mesh_path_start_discovery(sdata);
 738
 739         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 740                 mesh_mpath_table_grow();
 741
 742         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
 743                 mesh_mpp_table_grow();
 744
 745         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 746                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 747
 748         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 749                 ieee80211_mesh_rootpath(sdata);
 750
 751         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
 752                 mesh_sync_adjust_tbtt(sdata);
 753 }
 754
 755 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 756 {
 757         struct ieee80211_sub_if_data *sdata;
 758
 759         rcu_read_lock();
 760         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 761                 if (ieee80211_vif_is_mesh(&sdata->vif))
 762                         ieee80211_queue_work(&local->hw, &sdata->work);
 763         rcu_read_unlock();
 764 }
 765
 766 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 767 {
 768         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 769
 770         setup_timer(&ifmsh->housekeeping_timer,
 771                     ieee80211_mesh_housekeeping_timer,
 772                     (unsigned long) sdata);
 773
 774         ifmsh->accepting_plinks = true;
 775         ifmsh->preq_id = 0;
 776         ifmsh->sn = 0;
 777         ifmsh->num_gates = 0;
 778         atomic_set(&ifmsh->mpaths, 0);
 779         mesh_rmc_init(sdata);
 780         ifmsh->last_preq = jiffies;
 781         ifmsh->next_perr = jiffies;
 782         /* Allocate all mesh structures when creating the first mesh interface. */
 783         if (!mesh_allocated)
 784                 ieee80211s_init();
 785         setup_timer(&ifmsh->mesh_path_timer,
 786                     ieee80211_mesh_path_timer,
 787                     (unsigned long) sdata);
 788         setup_timer(&ifmsh->mesh_path_root_timer,
 789                     ieee80211_mesh_path_root_timer,
 790                     (unsigned long) sdata);
 791         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 792         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 793         spin_lock_init(&ifmsh->sync_offset_lock);
 794 }