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         return 0;
 283 }
 284
 285 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 286 {
 287         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 288         u8 *pos;
 289
 290         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 291                 return -ENOMEM;
 292
 293         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 294         *pos++ = WLAN_EID_MESH_ID;
 295         *pos++ = ifmsh->mesh_id_len;
 296         if (ifmsh->mesh_id_len)
 297                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 298
 299         return 0;
 300 }
 301
 302 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
 303                                     struct sk_buff *skb)
 304 {
 305         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 306         u8 *pos;
 307
 308         /* see IEEE802.11-2012 13.14.6 */
 309         if (ifmsh->ps_peers_light_sleep == 0 &&
 310             ifmsh->ps_peers_deep_sleep == 0 &&
 311             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
 312                 return 0;
 313
 314         if (skb_tailroom(skb) < 4)
 315                 return -ENOMEM;
 316
 317         pos = skb_put(skb, 2 + 2);
 318         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
 319         *pos++ = 2;
 320         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 321
 322         return 0;
 323 }
 324
 325 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 326                         struct sk_buff *skb)
 327 {
 328         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 329         u8 offset, len;
 330         const u8 *data;
 331
 332         if (!ifmsh->ie || !ifmsh->ie_len)
 333                 return 0;
 334
 335         /* fast-forward to vendor IEs */
 336         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 337
 338         if (offset < ifmsh->ie_len) {
 339                 len = ifmsh->ie_len - offset;
 340                 data = ifmsh->ie + offset;
 341                 if (skb_tailroom(skb) < len)
 342                         return -ENOMEM;
 343                 memcpy(skb_put(skb, len), data, len);
 344         }
 345
 346         return 0;
 347 }
 348
 349 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 350 {
 351         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 352         u8 len = 0;
 353         const u8 *data;
 354
 355         if (!ifmsh->ie || !ifmsh->ie_len)
 356                 return 0;
 357
 358         /* find RSN IE */
 359         data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
 360         if (!data)
 361                 return 0;
 362
 363         len = data[1] + 2;
 364
 365         if (skb_tailroom(skb) < len)
 366                 return -ENOMEM;
 367         memcpy(skb_put(skb, len), data, len);
 368
 369         return 0;
 370 }
 371
 372 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
 373                                  struct sk_buff *skb)
 374 {
 375         struct ieee80211_chanctx_conf *chanctx_conf;
 376         struct ieee80211_channel *chan;
 377         u8 *pos;
 378
 379         if (skb_tailroom(skb) < 3)
 380                 return -ENOMEM;
 381
 382         rcu_read_lock();
 383         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 384         if (WARN_ON(!chanctx_conf)) {
 385                 rcu_read_unlock();
 386                 return -EINVAL;
 387         }
 388         chan = chanctx_conf->def.chan;
 389         rcu_read_unlock();
 390
 391         pos = skb_put(skb, 2 + 1);
 392         *pos++ = WLAN_EID_DS_PARAMS;
 393         *pos++ = 1;
 394         *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 395
 396         return 0;
 397 }
 398
 399 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
 400                        struct sk_buff *skb)
 401 {
 402         struct ieee80211_local *local = sdata->local;
 403         enum nl80211_band band = ieee80211_get_sdata_band(sdata);
 404         struct ieee80211_supported_band *sband;
 405         u8 *pos;
 406
 407         sband = local->hw.wiphy->bands[band];
 408         if (!sband->ht_cap.ht_supported ||
 409             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 410             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 411             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 412                 return 0;
 413
 414         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 415                 return -ENOMEM;
 416
 417         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 418         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 419
 420         return 0;
 421 }
 422
 423 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
 424                         struct sk_buff *skb)
 425 {
 426         struct ieee80211_local *local = sdata->local;
 427         struct ieee80211_chanctx_conf *chanctx_conf;
 428         struct ieee80211_channel *channel;
 429         struct ieee80211_supported_band *sband;
 430         struct ieee80211_sta_ht_cap *ht_cap;
 431         u8 *pos;
 432
 433         rcu_read_lock();
 434         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 435         if (WARN_ON(!chanctx_conf)) {
 436                 rcu_read_unlock();
 437                 return -EINVAL;
 438         }
 439         channel = chanctx_conf->def.chan;
 440         rcu_read_unlock();
 441
 442         sband = local->hw.wiphy->bands[channel->band];
 443         ht_cap = &sband->ht_cap;
 444
 445         if (!ht_cap->ht_supported ||
 446             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 447             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 448             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 449                 return 0;
 450
 451         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 452                 return -ENOMEM;
 453
 454         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 455         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
 456                                    sdata->vif.bss_conf.ht_operation_mode,
 457                                    false);
 458
 459         return 0;
 460 }
 461
 462 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
 463                         struct sk_buff *skb)
 464 {
 465         struct ieee80211_local *local = sdata->local;
 466         enum nl80211_band band = ieee80211_get_sdata_band(sdata);
 467         struct ieee80211_supported_band *sband;
 468         u8 *pos;
 469
 470         sband = local->hw.wiphy->bands[band];
 471         if (!sband->vht_cap.vht_supported ||
 472             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 473             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 474             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 475                 return 0;
 476
 477         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
 478                 return -ENOMEM;
 479
 480         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
 481         ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
 482
 483         return 0;
 484 }
 485
 486 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
 487                          struct sk_buff *skb)
 488 {
 489         struct ieee80211_local *local = sdata->local;
 490         struct ieee80211_chanctx_conf *chanctx_conf;
 491         struct ieee80211_channel *channel;
 492         struct ieee80211_supported_band *sband;
 493         struct ieee80211_sta_vht_cap *vht_cap;
 494         u8 *pos;
 495
 496         rcu_read_lock();
 497         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 498         if (WARN_ON(!chanctx_conf)) {
 499                 rcu_read_unlock();
 500                 return -EINVAL;
 501         }
 502         channel = chanctx_conf->def.chan;
 503         rcu_read_unlock();
 504
 505         sband = local->hw.wiphy->bands[channel->band];
 506         vht_cap = &sband->vht_cap;
 507
 508         if (!vht_cap->vht_supported ||
 509             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 510             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 511             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 512                 return 0;
 513
 514         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
 515                 return -ENOMEM;
 516
 517         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 518         ieee80211_ie_build_vht_oper(pos, vht_cap,
 519                                     &sdata->vif.bss_conf.chandef);
 520
 521         return 0;
 522 }
 523
 524 static void ieee80211_mesh_path_timer(unsigned long data)
 525 {
 526         struct ieee80211_sub_if_data *sdata =
 527                 (struct ieee80211_sub_if_data *) data;
 528
 529         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 530 }
 531
 532 static void ieee80211_mesh_path_root_timer(unsigned long data)
 533 {
 534         struct ieee80211_sub_if_data *sdata =
 535                 (struct ieee80211_sub_if_data *) data;
 536         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 537
 538         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 539
 540         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 541 }
 542
 543 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 544 {
 545         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 546                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 547         else {
 548                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 549                 /* stop running timer */
 550                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 551         }
 552 }
 553
 554 /**
 555  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 556  * @hdr:        802.11 frame header
 557  * @fc:         frame control field
 558  * @meshda:     destination address in the mesh
 559  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 560  *              locally originated.
 561  *
 562  * Return the length of the 802.11 (does not include a mesh control header)
 563  */
 564 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 565                                   const u8 *meshda, const u8 *meshsa)
 566 {
 567         if (is_multicast_ether_addr(meshda)) {
 568                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 569                 /* DA TA SA */
 570                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 571                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 572                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 573                 return 24;
 574         } else {
 575                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 576                 /* RA TA DA SA */
 577                 eth_zero_addr(hdr->addr1);   /* RA is resolved later */
 578                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 579                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 580                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 581                 return 30;
 582         }
 583 }
 584
 585 /**
 586  * ieee80211_new_mesh_header - create a new mesh header
 587  * @sdata:      mesh interface to be used
 588  * @meshhdr:    uninitialized mesh header
 589  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 590  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 591  *              be NULL.
 592  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 593  *              mesh frame
 594  *
 595  * Return the header length.
 596  */
 597 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 598                                        struct ieee80211s_hdr *meshhdr,
 599                                        const char *addr4or5, const char *addr6)
 600 {
 601         if (WARN_ON(!addr4or5 && addr6))
 602                 return 0;
 603
 604         memset(meshhdr, 0, sizeof(*meshhdr));
 605
 606         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 607
 608         /* FIXME: racy -- TX on multiple queues can be concurrent */
 609         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 610         sdata->u.mesh.mesh_seqnum++;
 611
 612         if (addr4or5 && !addr6) {
 613                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 614                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 615                 return 2 * ETH_ALEN;
 616         } else if (addr4or5 && addr6) {
 617                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 618                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 619                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 620                 return 3 * ETH_ALEN;
 621         }
 622
 623         return ETH_ALEN;
 624 }
 625
 626 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 627 {
 628         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 629         u32 changed;
 630
 631         if (ifmsh->mshcfg.plink_timeout > 0)
 632                 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
 633         mesh_path_expire(sdata);
 634
 635         changed = mesh_accept_plinks_update(sdata);
 636         ieee80211_mbss_info_change_notify(sdata, changed);
 637
 638         mod_timer(&ifmsh->housekeeping_timer,
 639                   round_jiffies(jiffies +
 640                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 641 }
 642
 643 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 644 {
 645         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 646         u32 interval;
 647
 648         mesh_path_tx_root_frame(sdata);
 649
 650         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 651                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 652         else
 653                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 654
 655         mod_timer(&ifmsh->mesh_path_root_timer,
 656                   round_jiffies(TU_TO_EXP_TIME(interval)));
 657 }
 658
 659 static int
 660 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 661 {
 662         struct beacon_data *bcn;
 663         int head_len, tail_len;
 664         struct sk_buff *skb;
 665         struct ieee80211_mgmt *mgmt;
 666         struct ieee80211_chanctx_conf *chanctx_conf;
 667         struct mesh_csa_settings *csa;
 668         enum nl80211_band band;
 669         u8 *pos;
 670         struct ieee80211_sub_if_data *sdata;
 671         int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
 672                       sizeof(mgmt->u.beacon);
 673
 674         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 675         rcu_read_lock();
 676         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 677         band = chanctx_conf->def.chan->band;
 678         rcu_read_unlock();
 679
 680         head_len = hdr_len +
 681                    2 + /* NULL SSID */
 682                    /* Channel Switch Announcement */
 683                    2 + sizeof(struct ieee80211_channel_sw_ie) +
 684                    /* Mesh Channel Swith Parameters */
 685                    2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
 686                    2 + 8 + /* supported rates */
 687                    2 + 3; /* DS params */
 688         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 689                    2 + sizeof(struct ieee80211_ht_cap) +
 690                    2 + sizeof(struct ieee80211_ht_operation) +
 691                    2 + ifmsh->mesh_id_len +
 692                    2 + sizeof(struct ieee80211_meshconf_ie) +
 693                    2 + sizeof(__le16) + /* awake window */
 694                    2 + sizeof(struct ieee80211_vht_cap) +
 695                    2 + sizeof(struct ieee80211_vht_operation) +
 696                    ifmsh->ie_len;
 697
 698         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
 699         /* need an skb for IE builders to operate on */
 700         skb = dev_alloc_skb(max(head_len, tail_len));
 701
 702         if (!bcn || !skb)
 703                 goto out_free;
 704
 705         /*
 706          * pointers go into the block we allocated,
 707          * memory is | beacon_data | head | tail |
 708          */
 709         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
 710
 711         /* fill in the head */
 712         mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
 713         memset(mgmt, 0, hdr_len);
 714         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 715                                           IEEE80211_STYPE_BEACON);
 716         eth_broadcast_addr(mgmt->da);
 717         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 718         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 719         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
 720         mgmt->u.beacon.beacon_int =
 721                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
 722         mgmt->u.beacon.capab_info |= cpu_to_le16(
 723                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
 724
 725         pos = skb_put(skb, 2);
 726         *pos++ = WLAN_EID_SSID;
 727         *pos++ = 0x0;
 728
 729         rcu_read_lock();
 730         csa = rcu_dereference(ifmsh->csa);
 731         if (csa) {
 732                 pos = skb_put(skb, 13);
 733                 memset(pos, 0, 13);
 734                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 735                 *pos++ = 3;
 736                 *pos++ = 0x0;
 737                 *pos++ = ieee80211_frequency_to_channel(
 738                                 csa->settings.chandef.chan->center_freq);
 739                 bcn->csa_current_counter = csa->settings.count;
 740                 bcn->csa_counter_offsets[0] = hdr_len + 6;
 741                 *pos++ = csa->settings.count;
 742                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
 743                 *pos++ = 6;
 744                 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
 745                         *pos++ = ifmsh->mshcfg.dot11MeshTTL;
 746                         *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
 747                 } else {
 748                         *pos++ = ifmsh->chsw_ttl;
 749                 }
 750                 *pos++ |= csa->settings.block_tx ?
 751                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
 752                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
 753                 pos += 2;
 754                 put_unaligned_le16(ifmsh->pre_value, pos);
 755                 pos += 2;
 756         }
 757         rcu_read_unlock();
 758
 759         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
 760             mesh_add_ds_params_ie(sdata, skb))
 761                 goto out_free;
 762
 763         bcn->head_len = skb->len;
 764         memcpy(bcn->head, skb->data, bcn->head_len);
 765
 766         /* now the tail */
 767         skb_trim(skb, 0);
 768         bcn->tail = bcn->head + bcn->head_len;
 769
 770         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
 771             mesh_add_rsn_ie(sdata, skb) ||
 772             mesh_add_ht_cap_ie(sdata, skb) ||
 773             mesh_add_ht_oper_ie(sdata, skb) ||
 774             mesh_add_meshid_ie(sdata, skb) ||
 775             mesh_add_meshconf_ie(sdata, skb) ||
 776             mesh_add_awake_window_ie(sdata, skb) ||
 777             mesh_add_vht_cap_ie(sdata, skb) ||
 778             mesh_add_vht_oper_ie(sdata, skb) ||
 779             mesh_add_vendor_ies(sdata, skb))
 780                 goto out_free;
 781
 782         bcn->tail_len = skb->len;
 783         memcpy(bcn->tail, skb->data, bcn->tail_len);
 784         bcn->meshconf = (struct ieee80211_meshconf_ie *)
 785                                         (bcn->tail + ifmsh->meshconf_offset);
 786
 787         dev_kfree_skb(skb);
 788         rcu_assign_pointer(ifmsh->beacon, bcn);
 789         return 0;
 790 out_free:
 791         kfree(bcn);
 792         dev_kfree_skb(skb);
 793         return -ENOMEM;
 794 }
 795
 796 static int
 797 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
 798 {
 799         struct beacon_data *old_bcn;
 800         int ret;
 801
 802         old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
 803                                             lockdep_is_held(&sdata->wdev.mtx));
 804         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
 805         if (ret)
 806                 /* just reuse old beacon */
 807                 return ret;
 808
 809         if (old_bcn)
 810                 kfree_rcu(old_bcn, rcu_head);
 811         return 0;
 812 }
 813
 814 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 815                                        u32 changed)
 816 {
 817         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 818         unsigned long bits = changed;
 819         u32 bit;
 820
 821         if (!bits)
 822                 return;
 823
 824         /* if we race with running work, worst case this work becomes a noop */
 825         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
 826                 set_bit(bit, &ifmsh->mbss_changed);
 827         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
 828         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 829 }
 830
 831 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 832 {
 833         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 834         struct ieee80211_local *local = sdata->local;
 835         u32 changed = BSS_CHANGED_BEACON |
 836                       BSS_CHANGED_BEACON_ENABLED |
 837                       BSS_CHANGED_HT |
 838                       BSS_CHANGED_BASIC_RATES |
 839                       BSS_CHANGED_BEACON_INT;
 840
 841         local->fif_other_bss++;
 842         /* mesh ifaces must set allmulti to forward mcast traffic */
 843         atomic_inc(&local->iff_allmultis);
 844         ieee80211_configure_filter(local);
 845
 846         ifmsh->mesh_cc_id = 0;  /* Disabled */
 847         /* register sync ops from extensible synchronization framework */
 848         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 849         ifmsh->sync_offset_clockdrift_max = 0;
 850         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 851         ieee80211_mesh_root_setup(ifmsh);
 852         ieee80211_queue_work(&local->hw, &sdata->work);
 853         sdata->vif.bss_conf.ht_operation_mode =
 854                                 ifmsh->mshcfg.ht_opmode;
 855         sdata->vif.bss_conf.enable_beacon = true;
 856
 857         changed |= ieee80211_mps_local_status_update(sdata);
 858
 859         if (ieee80211_mesh_build_beacon(ifmsh)) {
 860                 ieee80211_stop_mesh(sdata);
 861                 return -ENOMEM;
 862         }
 863
 864         ieee80211_recalc_dtim(local, sdata);
 865         ieee80211_bss_info_change_notify(sdata, changed);
 866
 867         netif_carrier_on(sdata->dev);
 868         return 0;
 869 }
 870
 871 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 872 {
 873         struct ieee80211_local *local = sdata->local;
 874         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 875         struct beacon_data *bcn;
 876
 877         netif_carrier_off(sdata->dev);
 878
 879         /* flush STAs and mpaths on this iface */
 880         sta_info_flush(sdata);
 881         mesh_path_flush_by_iface(sdata);
 882
 883         /* stop the beacon */
 884         ifmsh->mesh_id_len = 0;
 885         sdata->vif.bss_conf.enable_beacon = false;
 886         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 887         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 888
 889         /* remove beacon */
 890         bcn = rcu_dereference_protected(ifmsh->beacon,
 891                                         lockdep_is_held(&sdata->wdev.mtx));
 892         RCU_INIT_POINTER(ifmsh->beacon, NULL);
 893         kfree_rcu(bcn, rcu_head);
 894
 895         /* free all potentially still buffered group-addressed frames */
 896         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
 897         skb_queue_purge(&ifmsh->ps.bc_buf);
 898
 899         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 900         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 901         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 902
 903         /* clear any mesh work (for next join) we may have accrued */
 904         ifmsh->wrkq_flags = 0;
 905         ifmsh->mbss_changed = 0;
 906
 907         local->fif_other_bss--;
 908         atomic_dec(&local->iff_allmultis);
 909         ieee80211_configure_filter(local);
 910 }
 911
 912 static bool
 913 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
 914                                  struct ieee802_11_elems *elems, bool beacon)
 915 {
 916         struct cfg80211_csa_settings params;
 917         struct ieee80211_csa_ie csa_ie;
 918         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 919         enum nl80211_band band = ieee80211_get_sdata_band(sdata);
 920         int err;
 921         u32 sta_flags;
 922
 923         sdata_assert_lock(sdata);
 924
 925         sta_flags = IEEE80211_STA_DISABLE_VHT;
 926         switch (sdata->vif.bss_conf.chandef.width) {
 927         case NL80211_CHAN_WIDTH_20_NOHT:
 928                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 929         case NL80211_CHAN_WIDTH_20:
 930                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 931                 break;
 932         default:
 933                 break;
 934         }
 935
 936         memset(&params, 0, sizeof(params));
 937         memset(&csa_ie, 0, sizeof(csa_ie));
 938         err = ieee80211_parse_ch_switch_ie(sdata, elems, band,
 939                                            sta_flags, sdata->vif.addr,
 940                                            &csa_ie);
 941         if (err < 0)
 942                 return false;
 943         if (err)
 944                 return false;
 945
 946         params.chandef = csa_ie.chandef;
 947         params.count = csa_ie.count;
 948
 949         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
 950                                      IEEE80211_CHAN_DISABLED)) {
 951                 sdata_info(sdata,
 952                            "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
 953                            sdata->vif.addr,
 954                            params.chandef.chan->center_freq,
 955                            params.chandef.width,
 956                            params.chandef.center_freq1,
 957                            params.chandef.center_freq2);
 958                 return false;
 959         }
 960
 961         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 962                                             &params.chandef,
 963                                             NL80211_IFTYPE_MESH_POINT);
 964         if (err < 0)
 965                 return false;
 966         if (err > 0)
 967                 /* TODO: DFS not (yet) supported */
 968                 return false;
 969
 970         params.radar_required = err;
 971
 972         if (cfg80211_chandef_identical(&params.chandef,
 973                                        &sdata->vif.bss_conf.chandef)) {
 974                 mcsa_dbg(sdata,
 975                          "received csa with an identical chandef, ignoring\n");
 976                 return true;
 977         }
 978
 979         mcsa_dbg(sdata,
 980                  "received channel switch announcement to go to channel %d MHz\n",
 981                  params.chandef.chan->center_freq);
 982
 983         params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
 984         if (beacon) {
 985                 ifmsh->chsw_ttl = csa_ie.ttl - 1;
 986                 if (ifmsh->pre_value >= csa_ie.pre_value)
 987                         return false;
 988                 ifmsh->pre_value = csa_ie.pre_value;
 989         }
 990
 991         if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
 992                 return false;
 993
 994         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
 995
 996         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
 997                                      &params) < 0)
 998                 return false;
 999
1000         return true;
1001 }
1002
1003 static void
1004 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1005                             struct ieee80211_mgmt *mgmt, size_t len)
1006 {
1007         struct ieee80211_local *local = sdata->local;
1008         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1009         struct sk_buff *presp;
1010         struct beacon_data *bcn;
1011         struct ieee80211_mgmt *hdr;
1012         struct ieee802_11_elems elems;
1013         size_t baselen;
1014         u8 *pos;
1015
1016         pos = mgmt->u.probe_req.variable;
1017         baselen = (u8 *) pos - (u8 *) mgmt;
1018         if (baselen > len)
1019                 return;
1020
1021         ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1022
1023         if (!elems.mesh_id)
1024                 return;
1025
1026         /* 802.11-2012 10.1.4.3.2 */
1027         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1028              !is_broadcast_ether_addr(mgmt->da)) ||
1029             elems.ssid_len != 0)
1030                 return;
1031
1032         if (elems.mesh_id_len != 0 &&
1033             (elems.mesh_id_len != ifmsh->mesh_id_len ||
1034              memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1035                 return;
1036
1037         rcu_read_lock();
1038         bcn = rcu_dereference(ifmsh->beacon);
1039
1040         if (!bcn)
1041                 goto out;
1042
1043         presp = dev_alloc_skb(local->tx_headroom +
1044                               bcn->head_len + bcn->tail_len);
1045         if (!presp)
1046                 goto out;
1047
1048         skb_reserve(presp, local->tx_headroom);
1049         memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
1050         memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
1051         hdr = (struct ieee80211_mgmt *) presp->data;
1052         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1053                                          IEEE80211_STYPE_PROBE_RESP);
1054         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1055         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1056         ieee80211_tx_skb(sdata, presp);
1057 out:
1058         rcu_read_unlock();
1059 }
1060
1061 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1062                                         u16 stype,
1063                                         struct ieee80211_mgmt *mgmt,
1064                                         size_t len,
1065                                         struct ieee80211_rx_status *rx_status)
1066 {
1067         struct ieee80211_local *local = sdata->local;
1068         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1069         struct ieee802_11_elems elems;
1070         struct ieee80211_channel *channel;
1071         size_t baselen;
1072         int freq;
1073         enum nl80211_band band = rx_status->band;
1074
1075         /* ignore ProbeResp to foreign address */
1076         if (stype == IEEE80211_STYPE_PROBE_RESP &&
1077             !ether_addr_equal(mgmt->da, sdata->vif.addr))
1078                 return;
1079
1080         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1081         if (baselen > len)
1082                 return;
1083
1084         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1085                                false, &elems);
1086
1087         /* ignore non-mesh or secure / unsecure mismatch */
1088         if ((!elems.mesh_id || !elems.mesh_config) ||
1089             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1090             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1091                 return;
1092
1093         if (elems.ds_params)
1094                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1095         else
1096                 freq = rx_status->freq;
1097
1098         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1099
1100         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1101                 return;
1102
1103         if (mesh_matches_local(sdata, &elems))
1104                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
1105
1106         if (ifmsh->sync_ops)
1107                 ifmsh->sync_ops->rx_bcn_presp(sdata,
1108                         stype, mgmt, &elems, rx_status);
1109
1110         if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1111             !sdata->vif.csa_active)
1112                 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1113 }
1114
1115 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1116 {
1117         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1118         struct mesh_csa_settings *tmp_csa_settings;
1119         int ret = 0;
1120         int changed = 0;
1121
1122         /* Reset the TTL value and Initiator flag */
1123         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1124         ifmsh->chsw_ttl = 0;
1125
1126         /* Remove the CSA and MCSP elements from the beacon */
1127         tmp_csa_settings = rcu_dereference(ifmsh->csa);
1128         RCU_INIT_POINTER(ifmsh->csa, NULL);
1129         if (tmp_csa_settings)
1130                 kfree_rcu(tmp_csa_settings, rcu_head);
1131         ret = ieee80211_mesh_rebuild_beacon(sdata);
1132         if (ret)
1133                 return -EINVAL;
1134
1135         changed |= BSS_CHANGED_BEACON;
1136
1137         mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1138                  sdata->vif.bss_conf.chandef.chan->center_freq);
1139         return changed;
1140 }
1141
1142 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1143                               struct cfg80211_csa_settings *csa_settings)
1144 {
1145         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1146         struct mesh_csa_settings *tmp_csa_settings;
1147         int ret = 0;
1148
1149         tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1150                                    GFP_ATOMIC);
1151         if (!tmp_csa_settings)
1152                 return -ENOMEM;
1153
1154         memcpy(&tmp_csa_settings->settings, csa_settings,
1155                sizeof(struct cfg80211_csa_settings));
1156
1157         rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1158
1159         ret = ieee80211_mesh_rebuild_beacon(sdata);
1160         if (ret) {
1161                 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1162                 RCU_INIT_POINTER(ifmsh->csa, NULL);
1163                 kfree_rcu(tmp_csa_settings, rcu_head);
1164                 return ret;
1165         }
1166
1167         return BSS_CHANGED_BEACON;
1168 }
1169
1170 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1171                                struct ieee80211_mgmt *mgmt, size_t len)
1172 {
1173         struct ieee80211_mgmt *mgmt_fwd;
1174         struct sk_buff *skb;
1175         struct ieee80211_local *local = sdata->local;
1176         u8 *pos = mgmt->u.action.u.chan_switch.variable;
1177         size_t offset_ttl;
1178
1179         skb = dev_alloc_skb(local->tx_headroom + len);
1180         if (!skb)
1181                 return -ENOMEM;
1182         skb_reserve(skb, local->tx_headroom);
1183         mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
1184
1185         /* offset_ttl is based on whether the secondary channel
1186          * offset is available or not. Subtract 1 from the mesh TTL
1187          * and disable the initiator flag before forwarding.
1188          */
1189         offset_ttl = (len < 42) ? 7 : 10;
1190         *(pos + offset_ttl) -= 1;
1191         *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1192
1193         memcpy(mgmt_fwd, mgmt, len);
1194         eth_broadcast_addr(mgmt_fwd->da);
1195         memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1196         memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1197
1198         ieee80211_tx_skb(sdata, skb);
1199         return 0;
1200 }
1201
1202 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1203                               struct ieee80211_mgmt *mgmt, size_t len)
1204 {
1205         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1206         struct ieee802_11_elems elems;
1207         u16 pre_value;
1208         bool fwd_csa = true;
1209         size_t baselen;
1210         u8 *pos;
1211
1212         if (mgmt->u.action.u.measurement.action_code !=
1213             WLAN_ACTION_SPCT_CHL_SWITCH)
1214                 return;
1215
1216         pos = mgmt->u.action.u.chan_switch.variable;
1217         baselen = offsetof(struct ieee80211_mgmt,
1218                            u.action.u.chan_switch.variable);
1219         ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1220
1221         ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1222         if (!--ifmsh->chsw_ttl)
1223                 fwd_csa = false;
1224
1225         pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1226         if (ifmsh->pre_value >= pre_value)
1227                 return;
1228
1229         ifmsh->pre_value = pre_value;
1230
1231         if (!sdata->vif.csa_active &&
1232             !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1233                 mcsa_dbg(sdata, "Failed to process CSA action frame");
1234                 return;
1235         }
1236
1237         /* forward or re-broadcast the CSA frame */
1238         if (fwd_csa) {
1239                 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
1240                         mcsa_dbg(sdata, "Failed to forward the CSA frame");
1241         }
1242 }
1243
1244 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1245                                           struct ieee80211_mgmt *mgmt,
1246                                           size_t len,
1247                                           struct ieee80211_rx_status *rx_status)
1248 {
1249         switch (mgmt->u.action.category) {
1250         case WLAN_CATEGORY_SELF_PROTECTED:
1251                 switch (mgmt->u.action.u.self_prot.action_code) {
1252                 case WLAN_SP_MESH_PEERING_OPEN:
1253                 case WLAN_SP_MESH_PEERING_CLOSE:
1254                 case WLAN_SP_MESH_PEERING_CONFIRM:
1255                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1256                         break;
1257                 }
1258                 break;
1259         case WLAN_CATEGORY_MESH_ACTION:
1260                 if (mesh_action_is_path_sel(mgmt))
1261                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1262                 break;
1263         case WLAN_CATEGORY_SPECTRUM_MGMT:
1264                 mesh_rx_csa_frame(sdata, mgmt, len);
1265                 break;
1266         }
1267 }
1268
1269 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1270                                    struct sk_buff *skb)
1271 {
1272         struct ieee80211_rx_status *rx_status;
1273         struct ieee80211_mgmt *mgmt;
1274         u16 stype;
1275
1276         sdata_lock(sdata);
1277
1278         /* mesh already went down */
1279         if (!sdata->u.mesh.mesh_id_len)
1280                 goto out;
1281
1282         rx_status = IEEE80211_SKB_RXCB(skb);
1283         mgmt = (struct ieee80211_mgmt *) skb->data;
1284         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1285
1286         switch (stype) {
1287         case IEEE80211_STYPE_PROBE_RESP:
1288         case IEEE80211_STYPE_BEACON:
1289                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1290                                             rx_status);
1291                 break;
1292         case IEEE80211_STYPE_PROBE_REQ:
1293                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1294                 break;
1295         case IEEE80211_STYPE_ACTION:
1296                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1297                 break;
1298         }
1299 out:
1300         sdata_unlock(sdata);
1301 }
1302
1303 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1304 {
1305         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1306         u32 bit, changed = 0;
1307
1308         for_each_set_bit(bit, &ifmsh->mbss_changed,
1309                          sizeof(changed) * BITS_PER_BYTE) {
1310                 clear_bit(bit, &ifmsh->mbss_changed);
1311                 changed |= BIT(bit);
1312         }
1313
1314         if (sdata->vif.bss_conf.enable_beacon &&
1315             (changed & (BSS_CHANGED_BEACON |
1316                         BSS_CHANGED_HT |
1317                         BSS_CHANGED_BASIC_RATES |
1318                         BSS_CHANGED_BEACON_INT)))
1319                 if (ieee80211_mesh_rebuild_beacon(sdata))
1320                         return;
1321
1322         ieee80211_bss_info_change_notify(sdata, changed);
1323 }
1324
1325 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1326 {
1327         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1328
1329         sdata_lock(sdata);
1330
1331         /* mesh already went down */
1332         if (!sdata->u.mesh.mesh_id_len)
1333                 goto out;
1334
1335         if (ifmsh->preq_queue_len &&
1336             time_after(jiffies,
1337                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1338                 mesh_path_start_discovery(sdata);
1339
1340         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1341                 ieee80211_mesh_housekeeping(sdata);
1342
1343         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1344                 ieee80211_mesh_rootpath(sdata);
1345
1346         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1347                 mesh_sync_adjust_tsf(sdata);
1348
1349         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1350                 mesh_bss_info_changed(sdata);
1351 out:
1352         sdata_unlock(sdata);
1353 }
1354
1355
1356 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1357 {
1358         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1359         static u8 zero_addr[ETH_ALEN] = {};
1360
1361         setup_timer(&ifmsh->housekeeping_timer,
1362                     ieee80211_mesh_housekeeping_timer,
1363                     (unsigned long) sdata);
1364
1365         ifmsh->accepting_plinks = true;
1366         atomic_set(&ifmsh->mpaths, 0);
1367         mesh_rmc_init(sdata);
1368         ifmsh->last_preq = jiffies;
1369         ifmsh->next_perr = jiffies;
1370         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1371         /* Allocate all mesh structures when creating the first mesh interface. */
1372         if (!mesh_allocated)
1373                 ieee80211s_init();
1374
1375         mesh_pathtbl_init(sdata);
1376
1377         setup_timer(&ifmsh->mesh_path_timer,
1378                     ieee80211_mesh_path_timer,
1379                     (unsigned long) sdata);
1380         setup_timer(&ifmsh->mesh_path_root_timer,
1381                     ieee80211_mesh_path_root_timer,
1382                     (unsigned long) sdata);
1383         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1384         skb_queue_head_init(&ifmsh->ps.bc_buf);
1385         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1386         spin_lock_init(&ifmsh->sync_offset_lock);
1387         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1388
1389         sdata->vif.bss_conf.bssid = zero_addr;
1390 }
1391
1392 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1393 {
1394         mesh_rmc_free(sdata);
1395         mesh_pathtbl_unregister(sdata);
1396 }