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 #include "driver-ops.h"
  16
  17 static int mesh_allocated;
  18 static struct kmem_cache *rm_cache;
  19
  20 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  21 {
  22         return (mgmt->u.action.u.mesh_action.action_code ==
  23                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
  24 }
  25
  26 void ieee80211s_init(void)
  27 {
  28         mesh_allocated = 1;
  29         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  30                                      0, 0, NULL);
  31 }
  32
  33 void ieee80211s_stop(void)
  34 {
  35         if (!mesh_allocated)
  36                 return;
  37         kmem_cache_destroy(rm_cache);
  38 }
  39
  40 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  41 {
  42         struct ieee80211_sub_if_data *sdata = (void *) data;
  43         struct ieee80211_local *local = sdata->local;
  44         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  45
  46         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  47
  48         ieee80211_queue_work(&local->hw, &sdata->work);
  49 }
  50
  51 /**
  52  * mesh_matches_local - check if the config of a mesh point matches ours
  53  *
  54  * @sdata: local mesh subif
  55  * @ie: information elements of a management frame from the mesh peer
  56  *
  57  * This function checks if the mesh configuration of a mesh point matches the
  58  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  59  */
  60 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
  61                         struct ieee802_11_elems *ie)
  62 {
  63         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  64         u32 basic_rates = 0;
  65         struct cfg80211_chan_def sta_chan_def;
  66
  67         /*
  68          * As support for each feature is added, check for matching
  69          * - On mesh config capabilities
  70          *   - Power Save Support En
  71          *   - Sync support enabled
  72          *   - Sync support active
  73          *   - Sync support required from peer
  74          *   - MDA enabled
  75          * - Power management control on fc
  76          */
  77         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
  78              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  79              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  80              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  81              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  82              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  83              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  84                 return false;
  85
  86         ieee80211_sta_get_rates(sdata, ie, ieee80211_get_sdata_band(sdata),
  87                                 &basic_rates);
  88
  89         if (sdata->vif.bss_conf.basic_rates != basic_rates)
  90                 return false;
  91
  92         cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
  93                                 NL80211_CHAN_NO_HT);
  94         ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
  95         ieee80211_chandef_vht_oper(ie->vht_operation, &sta_chan_def);
  96
  97         if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
  98                                          &sta_chan_def))
  99                 return false;
 100
 101         return true;
 102 }
 103
 104 /**
 105  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 106  *
 107  * @ie: information elements of a management frame from the mesh peer
 108  */
 109 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 110 {
 111         return (ie->mesh_config->meshconf_cap &
 112                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 113 }
 114
 115 /**
 116  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
 117  *
 118  * @sdata: mesh interface in which mesh beacons are going to be updated
 119  *
 120  * Returns: beacon changed flag if the beacon content changed.
 121  */
 122 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 123 {
 124         bool free_plinks;
 125         u32 changed = 0;
 126
 127         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 128          * the mesh interface might be able to establish plinks with peers that
 129          * are already on the table but are not on PLINK_ESTAB state. However,
 130          * in general the mesh interface is not accepting peer link requests
 131          * from new peers, and that must be reflected in the beacon
 132          */
 133         free_plinks = mesh_plink_availables(sdata);
 134
 135         if (free_plinks != sdata->u.mesh.accepting_plinks) {
 136                 sdata->u.mesh.accepting_plinks = free_plinks;
 137                 changed = BSS_CHANGED_BEACON;
 138         }
 139
 140         return changed;
 141 }
 142
 143 /*
 144  * mesh_sta_cleanup - clean up any mesh sta state
 145  *
 146  * @sta: mesh sta to clean up.
 147  */
 148 void mesh_sta_cleanup(struct sta_info *sta)
 149 {
 150         struct ieee80211_sub_if_data *sdata = sta->sdata;
 151         u32 changed = mesh_plink_deactivate(sta);
 152
 153         if (changed)
 154                 ieee80211_mbss_info_change_notify(sdata, changed);
 155 }
 156
 157 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 158 {
 159         int i;
 160
 161         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 162         if (!sdata->u.mesh.rmc)
 163                 return -ENOMEM;
 164         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 165         for (i = 0; i < RMC_BUCKETS; i++)
 166                 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
 167         return 0;
 168 }
 169
 170 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 171 {
 172         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 173         struct rmc_entry *p;
 174         struct hlist_node *n;
 175         int i;
 176
 177         if (!sdata->u.mesh.rmc)
 178                 return;
 179
 180         for (i = 0; i < RMC_BUCKETS; i++) {
 181                 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 182                         hlist_del(&p->list);
 183                         kmem_cache_free(rm_cache, p);
 184                 }
 185         }
 186
 187         kfree(rmc);
 188         sdata->u.mesh.rmc = NULL;
 189 }
 190
 191 /**
 192  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 193  *
 194  * @sdata:      interface
 195  * @sa:         source address
 196  * @mesh_hdr:   mesh_header
 197  *
 198  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 199  *
 200  * Checks using the source address and the mesh sequence number if we have
 201  * received this frame lately. If the frame is not in the cache, it is added to
 202  * it.
 203  */
 204 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
 205                    const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
 206 {
 207         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 208         u32 seqnum = 0;
 209         int entries = 0;
 210         u8 idx;
 211         struct rmc_entry *p;
 212         struct hlist_node *n;
 213
 214         if (!rmc)
 215                 return -1;
 216
 217         /* Don't care about endianness since only match matters */
 218         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 219         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 220         hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 221                 ++entries;
 222                 if (time_after(jiffies, p->exp_time) ||
 223                     entries == RMC_QUEUE_MAX_LEN) {
 224                         hlist_del(&p->list);
 225                         kmem_cache_free(rm_cache, p);
 226                         --entries;
 227                 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
 228                         return -1;
 229         }
 230
 231         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 232         if (!p)
 233                 return 0;
 234
 235         p->seqnum = seqnum;
 236         p->exp_time = jiffies + RMC_TIMEOUT;
 237         memcpy(p->sa, sa, ETH_ALEN);
 238         hlist_add_head(&p->list, &rmc->bucket[idx]);
 239         return 0;
 240 }
 241
 242 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
 243                          struct sk_buff *skb)
 244 {
 245         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 246         u8 *pos, neighbors;
 247         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 248
 249         if (skb_tailroom(skb) < 2 + meshconf_len)
 250                 return -ENOMEM;
 251
 252         pos = skb_put(skb, 2 + meshconf_len);
 253         *pos++ = WLAN_EID_MESH_CONFIG;
 254         *pos++ = meshconf_len;
 255
 256         /* save a pointer for quick updates in pre-tbtt */
 257         ifmsh->meshconf_offset = pos - skb->data;
 258
 259         /* Active path selection protocol ID */
 260         *pos++ = ifmsh->mesh_pp_id;
 261         /* Active path selection metric ID   */
 262         *pos++ = ifmsh->mesh_pm_id;
 263         /* Congestion control mode identifier */
 264         *pos++ = ifmsh->mesh_cc_id;
 265         /* Synchronization protocol identifier */
 266         *pos++ = ifmsh->mesh_sp_id;
 267         /* Authentication Protocol identifier */
 268         *pos++ = ifmsh->mesh_auth_id;
 269         /* Mesh Formation Info - number of neighbors */
 270         neighbors = atomic_read(&ifmsh->estab_plinks);
 271         neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
 272         *pos++ = neighbors << 1;
 273         /* Mesh capability */
 274         *pos = 0x00;
 275         *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
 276                         IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
 277         *pos |= ifmsh->accepting_plinks ?
 278                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 279         /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
 280         *pos |= ifmsh->ps_peers_deep_sleep ?
 281                         IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
 282         *pos++ |= ifmsh->adjusting_tbtt ?
 283                         IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
 284         *pos++ = 0x00;
 285
 286         return 0;
 287 }
 288
 289 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 290 {
 291         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 292         u8 *pos;
 293
 294         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 295                 return -ENOMEM;
 296
 297         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 298         *pos++ = WLAN_EID_MESH_ID;
 299         *pos++ = ifmsh->mesh_id_len;
 300         if (ifmsh->mesh_id_len)
 301                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 302
 303         return 0;
 304 }
 305
 306 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
 307                                     struct sk_buff *skb)
 308 {
 309         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 310         u8 *pos;
 311
 312         /* see IEEE802.11-2012 13.14.6 */
 313         if (ifmsh->ps_peers_light_sleep == 0 &&
 314             ifmsh->ps_peers_deep_sleep == 0 &&
 315             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
 316                 return 0;
 317
 318         if (skb_tailroom(skb) < 4)
 319                 return -ENOMEM;
 320
 321         pos = skb_put(skb, 2 + 2);
 322         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
 323         *pos++ = 2;
 324         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 325
 326         return 0;
 327 }
 328
 329 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 330                         struct sk_buff *skb)
 331 {
 332         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 333         u8 offset, len;
 334         const u8 *data;
 335
 336         if (!ifmsh->ie || !ifmsh->ie_len)
 337                 return 0;
 338
 339         /* fast-forward to vendor IEs */
 340         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 341
 342         if (offset) {
 343                 len = ifmsh->ie_len - offset;
 344                 data = ifmsh->ie + offset;
 345                 if (skb_tailroom(skb) < len)
 346                         return -ENOMEM;
 347                 memcpy(skb_put(skb, len), data, len);
 348         }
 349
 350         return 0;
 351 }
 352
 353 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 354 {
 355         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 356         u8 len = 0;
 357         const u8 *data;
 358
 359         if (!ifmsh->ie || !ifmsh->ie_len)
 360                 return 0;
 361
 362         /* find RSN IE */
 363         data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
 364         if (!data)
 365                 return 0;
 366
 367         len = data[1] + 2;
 368
 369         if (skb_tailroom(skb) < len)
 370                 return -ENOMEM;
 371         memcpy(skb_put(skb, len), data, len);
 372
 373         return 0;
 374 }
 375
 376 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
 377                                  struct sk_buff *skb)
 378 {
 379         struct ieee80211_chanctx_conf *chanctx_conf;
 380         struct ieee80211_channel *chan;
 381         u8 *pos;
 382
 383         if (skb_tailroom(skb) < 3)
 384                 return -ENOMEM;
 385
 386         rcu_read_lock();
 387         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 388         if (WARN_ON(!chanctx_conf)) {
 389                 rcu_read_unlock();
 390                 return -EINVAL;
 391         }
 392         chan = chanctx_conf->def.chan;
 393         rcu_read_unlock();
 394
 395         pos = skb_put(skb, 2 + 1);
 396         *pos++ = WLAN_EID_DS_PARAMS;
 397         *pos++ = 1;
 398         *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 399
 400         return 0;
 401 }
 402
 403 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
 404                        struct sk_buff *skb)
 405 {
 406         struct ieee80211_local *local = sdata->local;
 407         enum nl80211_band band = ieee80211_get_sdata_band(sdata);
 408         struct ieee80211_supported_band *sband;
 409         u8 *pos;
 410
 411         sband = local->hw.wiphy->bands[band];
 412         if (!sband->ht_cap.ht_supported ||
 413             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 414             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 415             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 416                 return 0;
 417
 418         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 419                 return -ENOMEM;
 420
 421         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 422         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 423
 424         return 0;
 425 }
 426
 427 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
 428                         struct sk_buff *skb)
 429 {
 430         struct ieee80211_local *local = sdata->local;
 431         struct ieee80211_chanctx_conf *chanctx_conf;
 432         struct ieee80211_channel *channel;
 433         struct ieee80211_supported_band *sband;
 434         struct ieee80211_sta_ht_cap *ht_cap;
 435         u8 *pos;
 436
 437         rcu_read_lock();
 438         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 439         if (WARN_ON(!chanctx_conf)) {
 440                 rcu_read_unlock();
 441                 return -EINVAL;
 442         }
 443         channel = chanctx_conf->def.chan;
 444         rcu_read_unlock();
 445
 446         sband = local->hw.wiphy->bands[channel->band];
 447         ht_cap = &sband->ht_cap;
 448
 449         if (!ht_cap->ht_supported ||
 450             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 451             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 452             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 453                 return 0;
 454
 455         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 456                 return -ENOMEM;
 457
 458         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 459         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
 460                                    sdata->vif.bss_conf.ht_operation_mode,
 461                                    false);
 462
 463         return 0;
 464 }
 465
 466 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
 467                         struct sk_buff *skb)
 468 {
 469         struct ieee80211_local *local = sdata->local;
 470         enum nl80211_band band = ieee80211_get_sdata_band(sdata);
 471         struct ieee80211_supported_band *sband;
 472         u8 *pos;
 473
 474         sband = local->hw.wiphy->bands[band];
 475         if (!sband->vht_cap.vht_supported ||
 476             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 477             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 478             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 479                 return 0;
 480
 481         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
 482                 return -ENOMEM;
 483
 484         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
 485         ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
 486
 487         return 0;
 488 }
 489
 490 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
 491                          struct sk_buff *skb)
 492 {
 493         struct ieee80211_local *local = sdata->local;
 494         struct ieee80211_chanctx_conf *chanctx_conf;
 495         struct ieee80211_channel *channel;
 496         struct ieee80211_supported_band *sband;
 497         struct ieee80211_sta_vht_cap *vht_cap;
 498         u8 *pos;
 499
 500         rcu_read_lock();
 501         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 502         if (WARN_ON(!chanctx_conf)) {
 503                 rcu_read_unlock();
 504                 return -EINVAL;
 505         }
 506         channel = chanctx_conf->def.chan;
 507         rcu_read_unlock();
 508
 509         sband = local->hw.wiphy->bands[channel->band];
 510         vht_cap = &sband->vht_cap;
 511
 512         if (!vht_cap->vht_supported ||
 513             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 514             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 515             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 516                 return 0;
 517
 518         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
 519                 return -ENOMEM;
 520
 521         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 522         ieee80211_ie_build_vht_oper(pos, vht_cap,
 523                                     &sdata->vif.bss_conf.chandef);
 524
 525         return 0;
 526 }
 527
 528 static void ieee80211_mesh_path_timer(unsigned long data)
 529 {
 530         struct ieee80211_sub_if_data *sdata =
 531                 (struct ieee80211_sub_if_data *) data;
 532
 533         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 534 }
 535
 536 static void ieee80211_mesh_path_root_timer(unsigned long data)
 537 {
 538         struct ieee80211_sub_if_data *sdata =
 539                 (struct ieee80211_sub_if_data *) data;
 540         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 541
 542         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 543
 544         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 545 }
 546
 547 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 548 {
 549         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 550                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 551         else {
 552                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 553                 /* stop running timer */
 554                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 555         }
 556 }
 557
 558 /**
 559  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 560  * @hdr:        802.11 frame header
 561  * @fc:         frame control field
 562  * @meshda:     destination address in the mesh
 563  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 564  *              locally originated.
 565  *
 566  * Return the length of the 802.11 (does not include a mesh control header)
 567  */
 568 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 569                                   const u8 *meshda, const u8 *meshsa)
 570 {
 571         if (is_multicast_ether_addr(meshda)) {
 572                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 573                 /* DA TA SA */
 574                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 575                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 576                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 577                 return 24;
 578         } else {
 579                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 580                 /* RA TA DA SA */
 581                 eth_zero_addr(hdr->addr1);   /* RA is resolved later */
 582                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 583                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 584                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 585                 return 30;
 586         }
 587 }
 588
 589 /**
 590  * ieee80211_new_mesh_header - create a new mesh header
 591  * @sdata:      mesh interface to be used
 592  * @meshhdr:    uninitialized mesh header
 593  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 594  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 595  *              be NULL.
 596  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 597  *              mesh frame
 598  *
 599  * Return the header length.
 600  */
 601 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 602                                        struct ieee80211s_hdr *meshhdr,
 603                                        const char *addr4or5, const char *addr6)
 604 {
 605         if (WARN_ON(!addr4or5 && addr6))
 606                 return 0;
 607
 608         memset(meshhdr, 0, sizeof(*meshhdr));
 609
 610         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 611
 612         /* FIXME: racy -- TX on multiple queues can be concurrent */
 613         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 614         sdata->u.mesh.mesh_seqnum++;
 615
 616         if (addr4or5 && !addr6) {
 617                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 618                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 619                 return 2 * ETH_ALEN;
 620         } else if (addr4or5 && addr6) {
 621                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 622                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 623                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 624                 return 3 * ETH_ALEN;
 625         }
 626
 627         return ETH_ALEN;
 628 }
 629
 630 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 631 {
 632         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 633         u32 changed;
 634
 635         if (ifmsh->mshcfg.plink_timeout > 0)
 636                 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
 637         mesh_path_expire(sdata);
 638
 639         changed = mesh_accept_plinks_update(sdata);
 640         ieee80211_mbss_info_change_notify(sdata, changed);
 641
 642         mod_timer(&ifmsh->housekeeping_timer,
 643                   round_jiffies(jiffies +
 644                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 645 }
 646
 647 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 648 {
 649         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 650         u32 interval;
 651
 652         mesh_path_tx_root_frame(sdata);
 653
 654         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 655                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 656         else
 657                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 658
 659         mod_timer(&ifmsh->mesh_path_root_timer,
 660                   round_jiffies(TU_TO_EXP_TIME(interval)));
 661 }
 662
 663 static int
 664 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 665 {
 666         struct beacon_data *bcn;
 667         int head_len, tail_len;
 668         struct sk_buff *skb;
 669         struct ieee80211_mgmt *mgmt;
 670         struct ieee80211_chanctx_conf *chanctx_conf;
 671         struct mesh_csa_settings *csa;
 672         enum nl80211_band band;
 673         u8 *pos;
 674         struct ieee80211_sub_if_data *sdata;
 675         int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
 676                       sizeof(mgmt->u.beacon);
 677
 678         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 679         rcu_read_lock();
 680         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 681         band = chanctx_conf->def.chan->band;
 682         rcu_read_unlock();
 683
 684         head_len = hdr_len +
 685                    2 + /* NULL SSID */
 686                    /* Channel Switch Announcement */
 687                    2 + sizeof(struct ieee80211_channel_sw_ie) +
 688                    /* Mesh Channel Swith Parameters */
 689                    2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
 690                    2 + 8 + /* supported rates */
 691                    2 + 3; /* DS params */
 692         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 693                    2 + sizeof(struct ieee80211_ht_cap) +
 694                    2 + sizeof(struct ieee80211_ht_operation) +
 695                    2 + ifmsh->mesh_id_len +
 696                    2 + sizeof(struct ieee80211_meshconf_ie) +
 697                    2 + sizeof(__le16) + /* awake window */
 698                    2 + sizeof(struct ieee80211_vht_cap) +
 699                    2 + sizeof(struct ieee80211_vht_operation) +
 700                    ifmsh->ie_len;
 701
 702         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
 703         /* need an skb for IE builders to operate on */
 704         skb = dev_alloc_skb(max(head_len, tail_len));
 705
 706         if (!bcn || !skb)
 707                 goto out_free;
 708
 709         /*
 710          * pointers go into the block we allocated,
 711          * memory is | beacon_data | head | tail |
 712          */
 713         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
 714
 715         /* fill in the head */
 716         mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
 717         memset(mgmt, 0, hdr_len);
 718         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 719                                           IEEE80211_STYPE_BEACON);
 720         eth_broadcast_addr(mgmt->da);
 721         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 722         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 723         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
 724         mgmt->u.beacon.beacon_int =
 725                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
 726         mgmt->u.beacon.capab_info |= cpu_to_le16(
 727                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
 728
 729         pos = skb_put(skb, 2);
 730         *pos++ = WLAN_EID_SSID;
 731         *pos++ = 0x0;
 732
 733         rcu_read_lock();
 734         csa = rcu_dereference(ifmsh->csa);
 735         if (csa) {
 736                 pos = skb_put(skb, 13);
 737                 memset(pos, 0, 13);
 738                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 739                 *pos++ = 3;
 740                 *pos++ = 0x0;
 741                 *pos++ = ieee80211_frequency_to_channel(
 742                                 csa->settings.chandef.chan->center_freq);
 743                 bcn->csa_current_counter = csa->settings.count;
 744                 bcn->csa_counter_offsets[0] = hdr_len + 6;
 745                 *pos++ = csa->settings.count;
 746                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
 747                 *pos++ = 6;
 748                 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
 749                         *pos++ = ifmsh->mshcfg.dot11MeshTTL;
 750                         *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
 751                 } else {
 752                         *pos++ = ifmsh->chsw_ttl;
 753                 }
 754                 *pos++ |= csa->settings.block_tx ?
 755                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
 756                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
 757                 pos += 2;
 758                 put_unaligned_le16(ifmsh->pre_value, pos);
 759                 pos += 2;
 760         }
 761         rcu_read_unlock();
 762
 763         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
 764             mesh_add_ds_params_ie(sdata, skb))
 765                 goto out_free;
 766
 767         bcn->head_len = skb->len;
 768         memcpy(bcn->head, skb->data, bcn->head_len);
 769
 770         /* now the tail */
 771         skb_trim(skb, 0);
 772         bcn->tail = bcn->head + bcn->head_len;
 773
 774         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
 775             mesh_add_rsn_ie(sdata, skb) ||
 776             mesh_add_ht_cap_ie(sdata, skb) ||
 777             mesh_add_ht_oper_ie(sdata, skb) ||
 778             mesh_add_meshid_ie(sdata, skb) ||
 779             mesh_add_meshconf_ie(sdata, skb) ||
 780             mesh_add_awake_window_ie(sdata, skb) ||
 781             mesh_add_vht_cap_ie(sdata, skb) ||
 782             mesh_add_vht_oper_ie(sdata, skb) ||
 783             mesh_add_vendor_ies(sdata, skb))
 784                 goto out_free;
 785
 786         bcn->tail_len = skb->len;
 787         memcpy(bcn->tail, skb->data, bcn->tail_len);
 788         bcn->meshconf = (struct ieee80211_meshconf_ie *)
 789                                         (bcn->tail + ifmsh->meshconf_offset);
 790
 791         dev_kfree_skb(skb);
 792         rcu_assign_pointer(ifmsh->beacon, bcn);
 793         return 0;
 794 out_free:
 795         kfree(bcn);
 796         dev_kfree_skb(skb);
 797         return -ENOMEM;
 798 }
 799
 800 static int
 801 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
 802 {
 803         struct beacon_data *old_bcn;
 804         int ret;
 805
 806         old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
 807                                             lockdep_is_held(&sdata->wdev.mtx));
 808         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
 809         if (ret)
 810                 /* just reuse old beacon */
 811                 return ret;
 812
 813         if (old_bcn)
 814                 kfree_rcu(old_bcn, rcu_head);
 815         return 0;
 816 }
 817
 818 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 819                                        u32 changed)
 820 {
 821         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 822         unsigned long bits = changed;
 823         u32 bit;
 824
 825         if (!bits)
 826                 return;
 827
 828         /* if we race with running work, worst case this work becomes a noop */
 829         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
 830                 set_bit(bit, &ifmsh->mbss_changed);
 831         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
 832         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 833 }
 834
 835 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 836 {
 837         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 838         struct ieee80211_local *local = sdata->local;
 839         u32 changed = BSS_CHANGED_BEACON |
 840                       BSS_CHANGED_BEACON_ENABLED |
 841                       BSS_CHANGED_HT |
 842                       BSS_CHANGED_BASIC_RATES |
 843                       BSS_CHANGED_BEACON_INT;
 844
 845         local->fif_other_bss++;
 846         /* mesh ifaces must set allmulti to forward mcast traffic */
 847         atomic_inc(&local->iff_allmultis);
 848         ieee80211_configure_filter(local);
 849
 850         ifmsh->mesh_cc_id = 0;  /* Disabled */
 851         /* register sync ops from extensible synchronization framework */
 852         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 853         ifmsh->adjusting_tbtt = false;
 854         ifmsh->sync_offset_clockdrift_max = 0;
 855         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 856         ieee80211_mesh_root_setup(ifmsh);
 857         ieee80211_queue_work(&local->hw, &sdata->work);
 858         sdata->vif.bss_conf.ht_operation_mode =
 859                                 ifmsh->mshcfg.ht_opmode;
 860         sdata->vif.bss_conf.enable_beacon = true;
 861
 862         changed |= ieee80211_mps_local_status_update(sdata);
 863
 864         if (ieee80211_mesh_build_beacon(ifmsh)) {
 865                 ieee80211_stop_mesh(sdata);
 866                 return -ENOMEM;
 867         }
 868
 869         ieee80211_recalc_dtim(local, sdata);
 870         ieee80211_bss_info_change_notify(sdata, changed);
 871
 872         netif_carrier_on(sdata->dev);
 873         return 0;
 874 }
 875
 876 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 877 {
 878         struct ieee80211_local *local = sdata->local;
 879         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 880         struct beacon_data *bcn;
 881
 882         netif_carrier_off(sdata->dev);
 883
 884         /* flush STAs and mpaths on this iface */
 885         sta_info_flush(sdata);
 886         mesh_path_flush_by_iface(sdata);
 887
 888         /* stop the beacon */
 889         ifmsh->mesh_id_len = 0;
 890         sdata->vif.bss_conf.enable_beacon = false;
 891         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 892         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 893
 894         /* remove beacon */
 895         bcn = rcu_dereference_protected(ifmsh->beacon,
 896                                         lockdep_is_held(&sdata->wdev.mtx));
 897         RCU_INIT_POINTER(ifmsh->beacon, NULL);
 898         kfree_rcu(bcn, rcu_head);
 899
 900         /* free all potentially still buffered group-addressed frames */
 901         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
 902         skb_queue_purge(&ifmsh->ps.bc_buf);
 903
 904         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 905         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 906         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 907
 908         /* clear any mesh work (for next join) we may have accrued */
 909         ifmsh->wrkq_flags = 0;
 910         ifmsh->mbss_changed = 0;
 911
 912         local->fif_other_bss--;
 913         atomic_dec(&local->iff_allmultis);
 914         ieee80211_configure_filter(local);
 915 }
 916
 917 static bool
 918 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
 919                                  struct ieee802_11_elems *elems, bool beacon)
 920 {
 921         struct cfg80211_csa_settings params;
 922         struct ieee80211_csa_ie csa_ie;
 923         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 924         enum nl80211_band band = ieee80211_get_sdata_band(sdata);
 925         int err;
 926         u32 sta_flags;
 927
 928         sdata_assert_lock(sdata);
 929
 930         sta_flags = IEEE80211_STA_DISABLE_VHT;
 931         switch (sdata->vif.bss_conf.chandef.width) {
 932         case NL80211_CHAN_WIDTH_20_NOHT:
 933                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 934         case NL80211_CHAN_WIDTH_20:
 935                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 936                 break;
 937         default:
 938                 break;
 939         }
 940
 941         memset(&params, 0, sizeof(params));
 942         memset(&csa_ie, 0, sizeof(csa_ie));
 943         err = ieee80211_parse_ch_switch_ie(sdata, elems, band,
 944                                            sta_flags, sdata->vif.addr,
 945                                            &csa_ie);
 946         if (err < 0)
 947                 return false;
 948         if (err)
 949                 return false;
 950
 951         params.chandef = csa_ie.chandef;
 952         params.count = csa_ie.count;
 953
 954         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
 955                                      IEEE80211_CHAN_DISABLED)) {
 956                 sdata_info(sdata,
 957                            "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
 958                            sdata->vif.addr,
 959                            params.chandef.chan->center_freq,
 960                            params.chandef.width,
 961                            params.chandef.center_freq1,
 962                            params.chandef.center_freq2);
 963                 return false;
 964         }
 965
 966         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 967                                             &params.chandef,
 968                                             NL80211_IFTYPE_MESH_POINT);
 969         if (err < 0)
 970                 return false;
 971         if (err > 0)
 972                 /* TODO: DFS not (yet) supported */
 973                 return false;
 974
 975         params.radar_required = err;
 976
 977         if (cfg80211_chandef_identical(&params.chandef,
 978                                        &sdata->vif.bss_conf.chandef)) {
 979                 mcsa_dbg(sdata,
 980                          "received csa with an identical chandef, ignoring\n");
 981                 return true;
 982         }
 983
 984         mcsa_dbg(sdata,
 985                  "received channel switch announcement to go to channel %d MHz\n",
 986                  params.chandef.chan->center_freq);
 987
 988         params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
 989         if (beacon) {
 990                 ifmsh->chsw_ttl = csa_ie.ttl - 1;
 991                 if (ifmsh->pre_value >= csa_ie.pre_value)
 992                         return false;
 993                 ifmsh->pre_value = csa_ie.pre_value;
 994         }
 995
 996         if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
 997                 return false;
 998
 999         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1000
1001         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1002                                      &params) < 0)
1003                 return false;
1004
1005         return true;
1006 }
1007
1008 static void
1009 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1010                             struct ieee80211_mgmt *mgmt, size_t len)
1011 {
1012         struct ieee80211_local *local = sdata->local;
1013         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1014         struct sk_buff *presp;
1015         struct beacon_data *bcn;
1016         struct ieee80211_mgmt *hdr;
1017         struct ieee802_11_elems elems;
1018         size_t baselen;
1019         u8 *pos;
1020
1021         pos = mgmt->u.probe_req.variable;
1022         baselen = (u8 *) pos - (u8 *) mgmt;
1023         if (baselen > len)
1024                 return;
1025
1026         ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1027
1028         if (!elems.mesh_id)
1029                 return;
1030
1031         /* 802.11-2012 10.1.4.3.2 */
1032         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1033              !is_broadcast_ether_addr(mgmt->da)) ||
1034             elems.ssid_len != 0)
1035                 return;
1036
1037         if (elems.mesh_id_len != 0 &&
1038             (elems.mesh_id_len != ifmsh->mesh_id_len ||
1039              memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1040                 return;
1041
1042         rcu_read_lock();
1043         bcn = rcu_dereference(ifmsh->beacon);
1044
1045         if (!bcn)
1046                 goto out;
1047
1048         presp = dev_alloc_skb(local->tx_headroom +
1049                               bcn->head_len + bcn->tail_len);
1050         if (!presp)
1051                 goto out;
1052
1053         skb_reserve(presp, local->tx_headroom);
1054         memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
1055         memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
1056         hdr = (struct ieee80211_mgmt *) presp->data;
1057         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1058                                          IEEE80211_STYPE_PROBE_RESP);
1059         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1060         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1061         ieee80211_tx_skb(sdata, presp);
1062 out:
1063         rcu_read_unlock();
1064 }
1065
1066 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1067                                         u16 stype,
1068                                         struct ieee80211_mgmt *mgmt,
1069                                         size_t len,
1070                                         struct ieee80211_rx_status *rx_status)
1071 {
1072         struct ieee80211_local *local = sdata->local;
1073         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1074         struct ieee802_11_elems elems;
1075         struct ieee80211_channel *channel;
1076         size_t baselen;
1077         int freq;
1078         enum nl80211_band band = rx_status->band;
1079
1080         /* ignore ProbeResp to foreign address */
1081         if (stype == IEEE80211_STYPE_PROBE_RESP &&
1082             !ether_addr_equal(mgmt->da, sdata->vif.addr))
1083                 return;
1084
1085         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1086         if (baselen > len)
1087                 return;
1088
1089         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1090                                false, &elems);
1091
1092         /* ignore non-mesh or secure / unsecure mismatch */
1093         if ((!elems.mesh_id || !elems.mesh_config) ||
1094             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1095             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1096                 return;
1097
1098         if (elems.ds_params)
1099                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1100         else
1101                 freq = rx_status->freq;
1102
1103         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1104
1105         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1106                 return;
1107
1108         if (mesh_matches_local(sdata, &elems))
1109                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
1110
1111         if (ifmsh->sync_ops)
1112                 ifmsh->sync_ops->rx_bcn_presp(sdata,
1113                         stype, mgmt, &elems, rx_status);
1114
1115         if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1116             !sdata->vif.csa_active)
1117                 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1118 }
1119
1120 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1121 {
1122         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1123         struct mesh_csa_settings *tmp_csa_settings;
1124         int ret = 0;
1125         int changed = 0;
1126
1127         /* Reset the TTL value and Initiator flag */
1128         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1129         ifmsh->chsw_ttl = 0;
1130
1131         /* Remove the CSA and MCSP elements from the beacon */
1132         tmp_csa_settings = rcu_dereference(ifmsh->csa);
1133         RCU_INIT_POINTER(ifmsh->csa, NULL);
1134         if (tmp_csa_settings)
1135                 kfree_rcu(tmp_csa_settings, rcu_head);
1136         ret = ieee80211_mesh_rebuild_beacon(sdata);
1137         if (ret)
1138                 return -EINVAL;
1139
1140         changed |= BSS_CHANGED_BEACON;
1141
1142         mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1143                  sdata->vif.bss_conf.chandef.chan->center_freq);
1144         return changed;
1145 }
1146
1147 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1148                               struct cfg80211_csa_settings *csa_settings)
1149 {
1150         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1151         struct mesh_csa_settings *tmp_csa_settings;
1152         int ret = 0;
1153
1154         tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1155                                    GFP_ATOMIC);
1156         if (!tmp_csa_settings)
1157                 return -ENOMEM;
1158
1159         memcpy(&tmp_csa_settings->settings, csa_settings,
1160                sizeof(struct cfg80211_csa_settings));
1161
1162         rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1163
1164         ret = ieee80211_mesh_rebuild_beacon(sdata);
1165         if (ret) {
1166                 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1167                 RCU_INIT_POINTER(ifmsh->csa, NULL);
1168                 kfree_rcu(tmp_csa_settings, rcu_head);
1169                 return ret;
1170         }
1171
1172         return BSS_CHANGED_BEACON;
1173 }
1174
1175 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1176                                struct ieee80211_mgmt *mgmt, size_t len)
1177 {
1178         struct ieee80211_mgmt *mgmt_fwd;
1179         struct sk_buff *skb;
1180         struct ieee80211_local *local = sdata->local;
1181         u8 *pos = mgmt->u.action.u.chan_switch.variable;
1182         size_t offset_ttl;
1183
1184         skb = dev_alloc_skb(local->tx_headroom + len);
1185         if (!skb)
1186                 return -ENOMEM;
1187         skb_reserve(skb, local->tx_headroom);
1188         mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
1189
1190         /* offset_ttl is based on whether the secondary channel
1191          * offset is available or not. Subtract 1 from the mesh TTL
1192          * and disable the initiator flag before forwarding.
1193          */
1194         offset_ttl = (len < 42) ? 7 : 10;
1195         *(pos + offset_ttl) -= 1;
1196         *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1197
1198         memcpy(mgmt_fwd, mgmt, len);
1199         eth_broadcast_addr(mgmt_fwd->da);
1200         memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1201         memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1202
1203         ieee80211_tx_skb(sdata, skb);
1204         return 0;
1205 }
1206
1207 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1208                               struct ieee80211_mgmt *mgmt, size_t len)
1209 {
1210         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1211         struct ieee802_11_elems elems;
1212         u16 pre_value;
1213         bool fwd_csa = true;
1214         size_t baselen;
1215         u8 *pos;
1216
1217         if (mgmt->u.action.u.measurement.action_code !=
1218             WLAN_ACTION_SPCT_CHL_SWITCH)
1219                 return;
1220
1221         pos = mgmt->u.action.u.chan_switch.variable;
1222         baselen = offsetof(struct ieee80211_mgmt,
1223                            u.action.u.chan_switch.variable);
1224         ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1225
1226         ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1227         if (!--ifmsh->chsw_ttl)
1228                 fwd_csa = false;
1229
1230         pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1231         if (ifmsh->pre_value >= pre_value)
1232                 return;
1233
1234         ifmsh->pre_value = pre_value;
1235
1236         if (!sdata->vif.csa_active &&
1237             !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1238                 mcsa_dbg(sdata, "Failed to process CSA action frame");
1239                 return;
1240         }
1241
1242         /* forward or re-broadcast the CSA frame */
1243         if (fwd_csa) {
1244                 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
1245                         mcsa_dbg(sdata, "Failed to forward the CSA frame");
1246         }
1247 }
1248
1249 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1250                                           struct ieee80211_mgmt *mgmt,
1251                                           size_t len,
1252                                           struct ieee80211_rx_status *rx_status)
1253 {
1254         switch (mgmt->u.action.category) {
1255         case WLAN_CATEGORY_SELF_PROTECTED:
1256                 switch (mgmt->u.action.u.self_prot.action_code) {
1257                 case WLAN_SP_MESH_PEERING_OPEN:
1258                 case WLAN_SP_MESH_PEERING_CLOSE:
1259                 case WLAN_SP_MESH_PEERING_CONFIRM:
1260                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1261                         break;
1262                 }
1263                 break;
1264         case WLAN_CATEGORY_MESH_ACTION:
1265                 if (mesh_action_is_path_sel(mgmt))
1266                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1267                 break;
1268         case WLAN_CATEGORY_SPECTRUM_MGMT:
1269                 mesh_rx_csa_frame(sdata, mgmt, len);
1270                 break;
1271         }
1272 }
1273
1274 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1275                                    struct sk_buff *skb)
1276 {
1277         struct ieee80211_rx_status *rx_status;
1278         struct ieee80211_mgmt *mgmt;
1279         u16 stype;
1280
1281         sdata_lock(sdata);
1282
1283         /* mesh already went down */
1284         if (!sdata->u.mesh.mesh_id_len)
1285                 goto out;
1286
1287         rx_status = IEEE80211_SKB_RXCB(skb);
1288         mgmt = (struct ieee80211_mgmt *) skb->data;
1289         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1290
1291         switch (stype) {
1292         case IEEE80211_STYPE_PROBE_RESP:
1293         case IEEE80211_STYPE_BEACON:
1294                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1295                                             rx_status);
1296                 break;
1297         case IEEE80211_STYPE_PROBE_REQ:
1298                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1299                 break;
1300         case IEEE80211_STYPE_ACTION:
1301                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1302                 break;
1303         }
1304 out:
1305         sdata_unlock(sdata);
1306 }
1307
1308 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1309 {
1310         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1311         u32 bit, changed = 0;
1312
1313         for_each_set_bit(bit, &ifmsh->mbss_changed,
1314                          sizeof(changed) * BITS_PER_BYTE) {
1315                 clear_bit(bit, &ifmsh->mbss_changed);
1316                 changed |= BIT(bit);
1317         }
1318
1319         if (sdata->vif.bss_conf.enable_beacon &&
1320             (changed & (BSS_CHANGED_BEACON |
1321                         BSS_CHANGED_HT |
1322                         BSS_CHANGED_BASIC_RATES |
1323                         BSS_CHANGED_BEACON_INT)))
1324                 if (ieee80211_mesh_rebuild_beacon(sdata))
1325                         return;
1326
1327         ieee80211_bss_info_change_notify(sdata, changed);
1328 }
1329
1330 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1331 {
1332         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1333
1334         sdata_lock(sdata);
1335
1336         /* mesh already went down */
1337         if (!sdata->u.mesh.mesh_id_len)
1338                 goto out;
1339
1340         if (ifmsh->preq_queue_len &&
1341             time_after(jiffies,
1342                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1343                 mesh_path_start_discovery(sdata);
1344
1345         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1346                 ieee80211_mesh_housekeeping(sdata);
1347
1348         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1349                 ieee80211_mesh_rootpath(sdata);
1350
1351         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1352                 mesh_sync_adjust_tbtt(sdata);
1353
1354         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1355                 mesh_bss_info_changed(sdata);
1356 out:
1357         sdata_unlock(sdata);
1358 }
1359
1360
1361 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1362 {
1363         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1364         static u8 zero_addr[ETH_ALEN] = {};
1365
1366         setup_timer(&ifmsh->housekeeping_timer,
1367                     ieee80211_mesh_housekeeping_timer,
1368                     (unsigned long) sdata);
1369
1370         ifmsh->accepting_plinks = true;
1371         atomic_set(&ifmsh->mpaths, 0);
1372         mesh_rmc_init(sdata);
1373         ifmsh->last_preq = jiffies;
1374         ifmsh->next_perr = jiffies;
1375         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1376         /* Allocate all mesh structures when creating the first mesh interface. */
1377         if (!mesh_allocated)
1378                 ieee80211s_init();
1379
1380         mesh_pathtbl_init(sdata);
1381
1382         setup_timer(&ifmsh->mesh_path_timer,
1383                     ieee80211_mesh_path_timer,
1384                     (unsigned long) sdata);
1385         setup_timer(&ifmsh->mesh_path_root_timer,
1386                     ieee80211_mesh_path_root_timer,
1387                     (unsigned long) sdata);
1388         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1389         skb_queue_head_init(&ifmsh->ps.bc_buf);
1390         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1391         spin_lock_init(&ifmsh->sync_offset_lock);
1392         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1393
1394         sdata->vif.bss_conf.bssid = zero_addr;
1395 }
1396
1397 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1398 {
1399         mesh_rmc_free(sdata);
1400         mesh_pathtbl_unregister(sdata);
1401 }