net/mac80211/mesh.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2008, 2009 open80211s Ltd.
   4  * Copyright (C) 2018 - 2023 Intel Corporation
   5  * Authors:    Luis Carlos Cobo <luisca@cozybit.com>
   6  *             Javier Cardona <javier@cozybit.com>
   7  */
   8
   9 #include <linux/slab.h>
  10 #include <asm/unaligned.h>
  11 #include "ieee80211_i.h"
  12 #include "mesh.h"
  13 #include "wme.h"
  14 #include "driver-ops.h"
  15
  16 static int mesh_allocated;
  17 static struct kmem_cache *rm_cache;
  18
  19 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  20 {
  21         return (mgmt->u.action.u.mesh_action.action_code ==
  22                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
  23 }
  24
  25 void ieee80211s_init(void)
  26 {
  27         mesh_allocated = 1;
  28         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  29                                      0, 0, NULL);
  30 }
  31
  32 void ieee80211s_stop(void)
  33 {
  34         if (!mesh_allocated)
  35                 return;
  36         kmem_cache_destroy(rm_cache);
  37 }
  38
  39 static void ieee80211_mesh_housekeeping_timer(struct timer_list *t)
  40 {
  41         struct ieee80211_sub_if_data *sdata =
  42                 from_timer(sdata, t, u.mesh.housekeeping_timer);
  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         wiphy_work_queue(local->hw.wiphy, &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         struct ieee80211_supported_band *sband;
  67         u32 vht_cap_info = 0;
  68
  69         /*
  70          * As support for each feature is added, check for matching
  71          * - On mesh config capabilities
  72          *   - Power Save Support En
  73          *   - Sync support enabled
  74          *   - Sync support active
  75          *   - Sync support required from peer
  76          *   - MDA enabled
  77          * - Power management control on fc
  78          */
  79         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
  80              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  81              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  82              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  83              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  84              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  85              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  86                 return false;
  87
  88         sband = ieee80211_get_sband(sdata);
  89         if (!sband)
  90                 return false;
  91
  92         ieee80211_sta_get_rates(sdata, ie, sband->band,
  93                                 &basic_rates);
  94
  95         if (sdata->vif.bss_conf.basic_rates != basic_rates)
  96                 return false;
  97
  98         cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
  99                                 NL80211_CHAN_NO_HT);
 100         ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
 101
 102         if (ie->vht_cap_elem)
 103                 vht_cap_info = le32_to_cpu(ie->vht_cap_elem->vht_cap_info);
 104
 105         ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info,
 106                                    ie->vht_operation, ie->ht_operation,
 107                                    &sta_chan_def);
 108         ieee80211_chandef_he_6ghz_oper(sdata, ie->he_operation, ie->eht_operation,
 109                                        &sta_chan_def);
 110
 111         if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
 112                                          &sta_chan_def))
 113                 return false;
 114
 115         return true;
 116 }
 117
 118 /**
 119  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 120  *
 121  * @ie: information elements of a management frame from the mesh peer
 122  */
 123 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 124 {
 125         return (ie->mesh_config->meshconf_cap &
 126                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 127 }
 128
 129 /**
 130  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
 131  *
 132  * @sdata: mesh interface in which mesh beacons are going to be updated
 133  *
 134  * Returns: beacon changed flag if the beacon content changed.
 135  */
 136 u64 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 137 {
 138         bool free_plinks;
 139         u64 changed = 0;
 140
 141         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 142          * the mesh interface might be able to establish plinks with peers that
 143          * are already on the table but are not on PLINK_ESTAB state. However,
 144          * in general the mesh interface is not accepting peer link requests
 145          * from new peers, and that must be reflected in the beacon
 146          */
 147         free_plinks = mesh_plink_availables(sdata);
 148
 149         if (free_plinks != sdata->u.mesh.accepting_plinks) {
 150                 sdata->u.mesh.accepting_plinks = free_plinks;
 151                 changed = BSS_CHANGED_BEACON;
 152         }
 153
 154         return changed;
 155 }
 156
 157 /*
 158  * mesh_sta_cleanup - clean up any mesh sta state
 159  *
 160  * @sta: mesh sta to clean up.
 161  */
 162 void mesh_sta_cleanup(struct sta_info *sta)
 163 {
 164         struct ieee80211_sub_if_data *sdata = sta->sdata;
 165         u64 changed = mesh_plink_deactivate(sta);
 166
 167         if (changed)
 168                 ieee80211_mbss_info_change_notify(sdata, changed);
 169 }
 170
 171 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 172 {
 173         int i;
 174
 175         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 176         if (!sdata->u.mesh.rmc)
 177                 return -ENOMEM;
 178         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 179         for (i = 0; i < RMC_BUCKETS; i++)
 180                 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
 181         return 0;
 182 }
 183
 184 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 185 {
 186         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 187         struct rmc_entry *p;
 188         struct hlist_node *n;
 189         int i;
 190
 191         if (!sdata->u.mesh.rmc)
 192                 return;
 193
 194         for (i = 0; i < RMC_BUCKETS; i++) {
 195                 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 196                         hlist_del(&p->list);
 197                         kmem_cache_free(rm_cache, p);
 198                 }
 199         }
 200
 201         kfree(rmc);
 202         sdata->u.mesh.rmc = NULL;
 203 }
 204
 205 /**
 206  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 207  *
 208  * @sdata:      interface
 209  * @sa:         source address
 210  * @mesh_hdr:   mesh_header
 211  *
 212  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 213  *
 214  * Checks using the source address and the mesh sequence number if we have
 215  * received this frame lately. If the frame is not in the cache, it is added to
 216  * it.
 217  */
 218 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
 219                    const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
 220 {
 221         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 222         u32 seqnum = 0;
 223         int entries = 0;
 224         u8 idx;
 225         struct rmc_entry *p;
 226         struct hlist_node *n;
 227
 228         if (!rmc)
 229                 return -1;
 230
 231         /* Don't care about endianness since only match matters */
 232         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 233         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 234         hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 235                 ++entries;
 236                 if (time_after(jiffies, p->exp_time) ||
 237                     entries == RMC_QUEUE_MAX_LEN) {
 238                         hlist_del(&p->list);
 239                         kmem_cache_free(rm_cache, p);
 240                         --entries;
 241                 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
 242                         return -1;
 243         }
 244
 245         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 246         if (!p)
 247                 return 0;
 248
 249         p->seqnum = seqnum;
 250         p->exp_time = jiffies + RMC_TIMEOUT;
 251         memcpy(p->sa, sa, ETH_ALEN);
 252         hlist_add_head(&p->list, &rmc->bucket[idx]);
 253         return 0;
 254 }
 255
 256 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
 257                          struct sk_buff *skb)
 258 {
 259         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 260         u8 *pos, neighbors;
 261         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 262         bool is_connected_to_gate = ifmsh->num_gates > 0 ||
 263                 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
 264                 ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
 265         bool is_connected_to_as = ifmsh->mshcfg.dot11MeshConnectedToAuthServer;
 266
 267         if (skb_tailroom(skb) < 2 + meshconf_len)
 268                 return -ENOMEM;
 269
 270         pos = skb_put(skb, 2 + meshconf_len);
 271         *pos++ = WLAN_EID_MESH_CONFIG;
 272         *pos++ = meshconf_len;
 273
 274         /* save a pointer for quick updates in pre-tbtt */
 275         ifmsh->meshconf_offset = pos - skb->data;
 276
 277         /* Active path selection protocol ID */
 278         *pos++ = ifmsh->mesh_pp_id;
 279         /* Active path selection metric ID   */
 280         *pos++ = ifmsh->mesh_pm_id;
 281         /* Congestion control mode identifier */
 282         *pos++ = ifmsh->mesh_cc_id;
 283         /* Synchronization protocol identifier */
 284         *pos++ = ifmsh->mesh_sp_id;
 285         /* Authentication Protocol identifier */
 286         *pos++ = ifmsh->mesh_auth_id;
 287         /* Mesh Formation Info - number of neighbors */
 288         neighbors = atomic_read(&ifmsh->estab_plinks);
 289         neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
 290         *pos++ = (is_connected_to_as << 7) |
 291                  (neighbors << 1) |
 292                  is_connected_to_gate;
 293         /* Mesh capability */
 294         *pos = 0x00;
 295         *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
 296                         IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
 297         *pos |= ifmsh->accepting_plinks ?
 298                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 299         /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
 300         *pos |= ifmsh->ps_peers_deep_sleep ?
 301                         IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
 302         return 0;
 303 }
 304
 305 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 306 {
 307         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 308         u8 *pos;
 309
 310         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 311                 return -ENOMEM;
 312
 313         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 314         *pos++ = WLAN_EID_MESH_ID;
 315         *pos++ = ifmsh->mesh_id_len;
 316         if (ifmsh->mesh_id_len)
 317                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 318
 319         return 0;
 320 }
 321
 322 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
 323                                     struct sk_buff *skb)
 324 {
 325         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 326         u8 *pos;
 327
 328         /* see IEEE802.11-2012 13.14.6 */
 329         if (ifmsh->ps_peers_light_sleep == 0 &&
 330             ifmsh->ps_peers_deep_sleep == 0 &&
 331             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
 332                 return 0;
 333
 334         if (skb_tailroom(skb) < 4)
 335                 return -ENOMEM;
 336
 337         pos = skb_put(skb, 2 + 2);
 338         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
 339         *pos++ = 2;
 340         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 341
 342         return 0;
 343 }
 344
 345 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 346                         struct sk_buff *skb)
 347 {
 348         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 349         u8 offset, len;
 350         const u8 *data;
 351
 352         if (!ifmsh->ie || !ifmsh->ie_len)
 353                 return 0;
 354
 355         /* fast-forward to vendor IEs */
 356         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 357
 358         if (offset < ifmsh->ie_len) {
 359                 len = ifmsh->ie_len - offset;
 360                 data = ifmsh->ie + offset;
 361                 if (skb_tailroom(skb) < len)
 362                         return -ENOMEM;
 363                 skb_put_data(skb, data, len);
 364         }
 365
 366         return 0;
 367 }
 368
 369 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 370 {
 371         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 372         u8 len = 0;
 373         const u8 *data;
 374
 375         if (!ifmsh->ie || !ifmsh->ie_len)
 376                 return 0;
 377
 378         /* find RSN IE */
 379         data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
 380         if (!data)
 381                 return 0;
 382
 383         len = data[1] + 2;
 384
 385         if (skb_tailroom(skb) < len)
 386                 return -ENOMEM;
 387         skb_put_data(skb, data, len);
 388
 389         return 0;
 390 }
 391
 392 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
 393                                  struct sk_buff *skb)
 394 {
 395         struct ieee80211_chanctx_conf *chanctx_conf;
 396         struct ieee80211_channel *chan;
 397         u8 *pos;
 398
 399         if (skb_tailroom(skb) < 3)
 400                 return -ENOMEM;
 401
 402         rcu_read_lock();
 403         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 404         if (WARN_ON(!chanctx_conf)) {
 405                 rcu_read_unlock();
 406                 return -EINVAL;
 407         }
 408         chan = chanctx_conf->def.chan;
 409         rcu_read_unlock();
 410
 411         pos = skb_put(skb, 2 + 1);
 412         *pos++ = WLAN_EID_DS_PARAMS;
 413         *pos++ = 1;
 414         *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 415
 416         return 0;
 417 }
 418
 419 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
 420                        struct sk_buff *skb)
 421 {
 422         struct ieee80211_supported_band *sband;
 423         u8 *pos;
 424
 425         sband = ieee80211_get_sband(sdata);
 426         if (!sband)
 427                 return -EINVAL;
 428
 429         /* HT not allowed in 6 GHz */
 430         if (sband->band == NL80211_BAND_6GHZ)
 431                 return 0;
 432
 433         if (!sband->ht_cap.ht_supported ||
 434             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 435             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 436             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 437                 return 0;
 438
 439         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 440                 return -ENOMEM;
 441
 442         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 443         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 444
 445         return 0;
 446 }
 447
 448 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
 449                         struct sk_buff *skb)
 450 {
 451         struct ieee80211_local *local = sdata->local;
 452         struct ieee80211_chanctx_conf *chanctx_conf;
 453         struct ieee80211_channel *channel;
 454         struct ieee80211_supported_band *sband;
 455         struct ieee80211_sta_ht_cap *ht_cap;
 456         u8 *pos;
 457
 458         rcu_read_lock();
 459         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 460         if (WARN_ON(!chanctx_conf)) {
 461                 rcu_read_unlock();
 462                 return -EINVAL;
 463         }
 464         channel = chanctx_conf->def.chan;
 465         rcu_read_unlock();
 466
 467         sband = local->hw.wiphy->bands[channel->band];
 468         ht_cap = &sband->ht_cap;
 469
 470         /* HT not allowed in 6 GHz */
 471         if (sband->band == NL80211_BAND_6GHZ)
 472                 return 0;
 473
 474         if (!ht_cap->ht_supported ||
 475             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 476             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 477             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 478                 return 0;
 479
 480         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 481                 return -ENOMEM;
 482
 483         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 484         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
 485                                    sdata->vif.bss_conf.ht_operation_mode,
 486                                    false);
 487
 488         return 0;
 489 }
 490
 491 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
 492                         struct sk_buff *skb)
 493 {
 494         struct ieee80211_supported_band *sband;
 495         u8 *pos;
 496
 497         sband = ieee80211_get_sband(sdata);
 498         if (!sband)
 499                 return -EINVAL;
 500
 501         /* VHT not allowed in 6 GHz */
 502         if (sband->band == NL80211_BAND_6GHZ)
 503                 return 0;
 504
 505         if (!sband->vht_cap.vht_supported ||
 506             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 507             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 508             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 509                 return 0;
 510
 511         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
 512                 return -ENOMEM;
 513
 514         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
 515         ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
 516
 517         return 0;
 518 }
 519
 520 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
 521                          struct sk_buff *skb)
 522 {
 523         struct ieee80211_local *local = sdata->local;
 524         struct ieee80211_chanctx_conf *chanctx_conf;
 525         struct ieee80211_channel *channel;
 526         struct ieee80211_supported_band *sband;
 527         struct ieee80211_sta_vht_cap *vht_cap;
 528         u8 *pos;
 529
 530         rcu_read_lock();
 531         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 532         if (WARN_ON(!chanctx_conf)) {
 533                 rcu_read_unlock();
 534                 return -EINVAL;
 535         }
 536         channel = chanctx_conf->def.chan;
 537         rcu_read_unlock();
 538
 539         sband = local->hw.wiphy->bands[channel->band];
 540         vht_cap = &sband->vht_cap;
 541
 542         /* VHT not allowed in 6 GHz */
 543         if (sband->band == NL80211_BAND_6GHZ)
 544                 return 0;
 545
 546         if (!vht_cap->vht_supported ||
 547             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 548             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 549             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 550                 return 0;
 551
 552         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
 553                 return -ENOMEM;
 554
 555         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 556         ieee80211_ie_build_vht_oper(pos, vht_cap,
 557                                     &sdata->vif.bss_conf.chandef);
 558
 559         return 0;
 560 }
 561
 562 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
 563                        struct sk_buff *skb, u8 ie_len)
 564 {
 565         const struct ieee80211_sta_he_cap *he_cap;
 566         struct ieee80211_supported_band *sband;
 567         u8 *pos;
 568
 569         sband = ieee80211_get_sband(sdata);
 570         if (!sband)
 571                 return -EINVAL;
 572
 573         he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 574
 575         if (!he_cap ||
 576             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 577             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 578             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 579                 return 0;
 580
 581         if (skb_tailroom(skb) < ie_len)
 582                 return -ENOMEM;
 583
 584         pos = skb_put(skb, ie_len);
 585         ieee80211_ie_build_he_cap(0, pos, he_cap, pos + ie_len);
 586
 587         return 0;
 588 }
 589
 590 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
 591                         struct sk_buff *skb)
 592 {
 593         const struct ieee80211_sta_he_cap *he_cap;
 594         struct ieee80211_supported_band *sband;
 595         u32 len;
 596         u8 *pos;
 597
 598         sband = ieee80211_get_sband(sdata);
 599         if (!sband)
 600                 return -EINVAL;
 601
 602         he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 603         if (!he_cap ||
 604             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 605             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 606             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 607                 return 0;
 608
 609         len = 2 + 1 + sizeof(struct ieee80211_he_operation);
 610         if (sdata->vif.bss_conf.chandef.chan->band == NL80211_BAND_6GHZ)
 611                 len += sizeof(struct ieee80211_he_6ghz_oper);
 612
 613         if (skb_tailroom(skb) < len)
 614                 return -ENOMEM;
 615
 616         pos = skb_put(skb, len);
 617         ieee80211_ie_build_he_oper(pos, &sdata->vif.bss_conf.chandef);
 618
 619         return 0;
 620 }
 621
 622 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata,
 623                             struct sk_buff *skb)
 624 {
 625         struct ieee80211_supported_band *sband;
 626         const struct ieee80211_sband_iftype_data *iftd;
 627
 628         sband = ieee80211_get_sband(sdata);
 629         if (!sband)
 630                 return -EINVAL;
 631
 632         iftd = ieee80211_get_sband_iftype_data(sband,
 633                                                NL80211_IFTYPE_MESH_POINT);
 634         /* The device doesn't support HE in mesh mode or at all */
 635         if (!iftd)
 636                 return 0;
 637
 638         ieee80211_ie_build_he_6ghz_cap(sdata, sdata->deflink.smps_mode, skb);
 639         return 0;
 640 }
 641
 642 int mesh_add_eht_cap_ie(struct ieee80211_sub_if_data *sdata,
 643                         struct sk_buff *skb, u8 ie_len)
 644 {
 645         const struct ieee80211_sta_he_cap *he_cap;
 646         const struct ieee80211_sta_eht_cap *eht_cap;
 647         struct ieee80211_supported_band *sband;
 648         u8 *pos;
 649
 650         sband = ieee80211_get_sband(sdata);
 651         if (!sband)
 652                 return -EINVAL;
 653
 654         he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 655         eht_cap = ieee80211_get_eht_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 656         if (!he_cap || !eht_cap ||
 657             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 658             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 659             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 660                 return 0;
 661
 662         if (skb_tailroom(skb) < ie_len)
 663                 return -ENOMEM;
 664
 665         pos = skb_put(skb, ie_len);
 666         ieee80211_ie_build_eht_cap(pos, he_cap, eht_cap, pos + ie_len, false);
 667
 668         return 0;
 669 }
 670
 671 int mesh_add_eht_oper_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 672 {
 673         const struct ieee80211_sta_eht_cap *eht_cap;
 674         struct ieee80211_supported_band *sband;
 675         u32 len;
 676         u8 *pos;
 677
 678         sband = ieee80211_get_sband(sdata);
 679         if (!sband)
 680                 return -EINVAL;
 681
 682         eht_cap = ieee80211_get_eht_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 683         if (!eht_cap ||
 684             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 685             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 686             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 687                 return 0;
 688
 689         len = 2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
 690                       offsetof(struct ieee80211_eht_operation_info, optional);
 691
 692         if (skb_tailroom(skb) < len)
 693                 return -ENOMEM;
 694
 695         pos = skb_put(skb, len);
 696         ieee80211_ie_build_eht_oper(pos, &sdata->vif.bss_conf.chandef, eht_cap);
 697
 698         return 0;
 699 }
 700
 701 static void ieee80211_mesh_path_timer(struct timer_list *t)
 702 {
 703         struct ieee80211_sub_if_data *sdata =
 704                 from_timer(sdata, t, u.mesh.mesh_path_timer);
 705
 706         wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
 707 }
 708
 709 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
 710 {
 711         struct ieee80211_sub_if_data *sdata =
 712                 from_timer(sdata, t, u.mesh.mesh_path_root_timer);
 713         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 714
 715         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 716
 717         wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
 718 }
 719
 720 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 721 {
 722         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 723                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 724         else {
 725                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 726                 /* stop running timer */
 727                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 728         }
 729 }
 730
 731 static void
 732 ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data *sdata,
 733                                  u8 *ie, u8 ie_len)
 734 {
 735         struct ieee80211_supported_band *sband;
 736         const struct element *cap;
 737         const struct ieee80211_he_operation *he_oper = NULL;
 738
 739         sband = ieee80211_get_sband(sdata);
 740         if (!sband)
 741                 return;
 742
 743         if (!ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT) ||
 744             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 745             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 746             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 747                 return;
 748
 749         sdata->vif.bss_conf.he_support = true;
 750
 751         cap = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ie_len);
 752         if (cap && cap->datalen >= 1 + sizeof(*he_oper) &&
 753             cap->datalen >= 1 + ieee80211_he_oper_size(cap->data + 1))
 754                 he_oper = (void *)(cap->data + 1);
 755
 756         if (he_oper)
 757                 sdata->vif.bss_conf.he_oper.params =
 758                         __le32_to_cpu(he_oper->he_oper_params);
 759
 760         sdata->vif.bss_conf.eht_support =
 761                 !!ieee80211_get_eht_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 762 }
 763
 764 bool ieee80211_mesh_xmit_fast(struct ieee80211_sub_if_data *sdata,
 765                               struct sk_buff *skb, u32 ctrl_flags)
 766 {
 767         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 768         struct ieee80211_mesh_fast_tx *entry;
 769         struct ieee80211s_hdr *meshhdr;
 770         u8 sa[ETH_ALEN] __aligned(2);
 771         struct tid_ampdu_tx *tid_tx;
 772         struct sta_info *sta;
 773         bool copy_sa = false;
 774         u16 ethertype;
 775         u8 tid;
 776
 777         if (ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP)
 778                 return false;
 779
 780         if (ifmsh->mshcfg.dot11MeshNolearn)
 781                 return false;
 782
 783         /* Add support for these cases later */
 784         if (ifmsh->ps_peers_light_sleep || ifmsh->ps_peers_deep_sleep)
 785                 return false;
 786
 787         if (is_multicast_ether_addr(skb->data))
 788                 return false;
 789
 790         ethertype = (skb->data[12] << 8) | skb->data[13];
 791         if (ethertype < ETH_P_802_3_MIN)
 792                 return false;
 793
 794         if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
 795                 return false;
 796
 797         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 798                 skb_set_transport_header(skb, skb_checksum_start_offset(skb));
 799                 if (skb_checksum_help(skb))
 800                         return false;
 801         }
 802
 803         entry = mesh_fast_tx_get(sdata, skb->data);
 804         if (!entry)
 805                 return false;
 806
 807         if (skb_headroom(skb) < entry->hdrlen + entry->fast_tx.hdr_len)
 808                 return false;
 809
 810         sta = rcu_dereference(entry->mpath->next_hop);
 811         if (!sta)
 812                 return false;
 813
 814         tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
 815         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 816         if (tid_tx) {
 817                 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
 818                         return false;
 819                 if (tid_tx->timeout)
 820                         tid_tx->last_tx = jiffies;
 821         }
 822
 823         skb = skb_share_check(skb, GFP_ATOMIC);
 824         if (!skb)
 825                 return true;
 826
 827         skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb));
 828
 829         meshhdr = (struct ieee80211s_hdr *)entry->hdr;
 830         if ((meshhdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) {
 831                 /* preserve SA from eth header for 6-addr frames */
 832                 ether_addr_copy(sa, skb->data + ETH_ALEN);
 833                 copy_sa = true;
 834         }
 835
 836         memcpy(skb_push(skb, entry->hdrlen - 2 * ETH_ALEN), entry->hdr,
 837                entry->hdrlen);
 838
 839         meshhdr = (struct ieee80211s_hdr *)skb->data;
 840         put_unaligned_le32(atomic_inc_return(&sdata->u.mesh.mesh_seqnum),
 841                            &meshhdr->seqnum);
 842         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 843         if (copy_sa)
 844             ether_addr_copy(meshhdr->eaddr2, sa);
 845
 846         skb_push(skb, 2 * ETH_ALEN);
 847         __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx,
 848                               entry->mpath->dst, sdata->vif.addr);
 849
 850         return true;
 851 }
 852
 853 /**
 854  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 855  * @hdr:        802.11 frame header
 856  * @fc:         frame control field
 857  * @meshda:     destination address in the mesh
 858  * @meshsa:     source address in the mesh.  Same as TA, as frame is
 859  *              locally originated.
 860  *
 861  * Return the length of the 802.11 (does not include a mesh control header)
 862  */
 863 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 864                                   const u8 *meshda, const u8 *meshsa)
 865 {
 866         if (is_multicast_ether_addr(meshda)) {
 867                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 868                 /* DA TA SA */
 869                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 870                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 871                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 872                 return 24;
 873         } else {
 874                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 875                 /* RA TA DA SA */
 876                 eth_zero_addr(hdr->addr1);   /* RA is resolved later */
 877                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 878                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 879                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 880                 return 30;
 881         }
 882 }
 883
 884 /**
 885  * ieee80211_new_mesh_header - create a new mesh header
 886  * @sdata:      mesh interface to be used
 887  * @meshhdr:    uninitialized mesh header
 888  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 889  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 890  *              be NULL.
 891  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 892  *              mesh frame
 893  *
 894  * Return the header length.
 895  */
 896 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 897                                        struct ieee80211s_hdr *meshhdr,
 898                                        const char *addr4or5, const char *addr6)
 899 {
 900         if (WARN_ON(!addr4or5 && addr6))
 901                 return 0;
 902
 903         memset(meshhdr, 0, sizeof(*meshhdr));
 904
 905         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 906
 907         put_unaligned_le32(atomic_inc_return(&sdata->u.mesh.mesh_seqnum),
 908                            &meshhdr->seqnum);
 909         if (addr4or5 && !addr6) {
 910                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 911                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 912                 return 2 * ETH_ALEN;
 913         } else if (addr4or5 && addr6) {
 914                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 915                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 916                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 917                 return 3 * ETH_ALEN;
 918         }
 919
 920         return ETH_ALEN;
 921 }
 922
 923 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 924 {
 925         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 926         u64 changed;
 927
 928         if (ifmsh->mshcfg.plink_timeout > 0)
 929                 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
 930         mesh_path_expire(sdata);
 931
 932         changed = mesh_accept_plinks_update(sdata);
 933         ieee80211_mbss_info_change_notify(sdata, changed);
 934
 935         mesh_fast_tx_gc(sdata);
 936
 937         mod_timer(&ifmsh->housekeeping_timer,
 938                   round_jiffies(jiffies +
 939                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 940 }
 941
 942 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 943 {
 944         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 945         u32 interval;
 946
 947         mesh_path_tx_root_frame(sdata);
 948
 949         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 950                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 951         else
 952                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 953
 954         mod_timer(&ifmsh->mesh_path_root_timer,
 955                   round_jiffies(TU_TO_EXP_TIME(interval)));
 956 }
 957
 958 static int
 959 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 960 {
 961         struct beacon_data *bcn;
 962         int head_len, tail_len;
 963         struct sk_buff *skb;
 964         struct ieee80211_mgmt *mgmt;
 965         struct ieee80211_chanctx_conf *chanctx_conf;
 966         struct mesh_csa_settings *csa;
 967         enum nl80211_band band;
 968         u8 ie_len_he_cap, ie_len_eht_cap;
 969         u8 *pos;
 970         struct ieee80211_sub_if_data *sdata;
 971         int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
 972
 973         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 974         rcu_read_lock();
 975         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 976         band = chanctx_conf->def.chan->band;
 977         rcu_read_unlock();
 978
 979         ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
 980                                                 NL80211_IFTYPE_MESH_POINT);
 981         ie_len_eht_cap = ieee80211_ie_len_eht_cap(sdata,
 982                                                   NL80211_IFTYPE_MESH_POINT);
 983         head_len = hdr_len +
 984                    2 + /* NULL SSID */
 985                    /* Channel Switch Announcement */
 986                    2 + sizeof(struct ieee80211_channel_sw_ie) +
 987                    /* Mesh Channel Switch Parameters */
 988                    2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
 989                    /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
 990                    2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
 991                    2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
 992                    2 + 8 + /* supported rates */
 993                    2 + 3; /* DS params */
 994         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 995                    2 + sizeof(struct ieee80211_ht_cap) +
 996                    2 + sizeof(struct ieee80211_ht_operation) +
 997                    2 + ifmsh->mesh_id_len +
 998                    2 + sizeof(struct ieee80211_meshconf_ie) +
 999                    2 + sizeof(__le16) + /* awake window */
1000                    2 + sizeof(struct ieee80211_vht_cap) +
1001                    2 + sizeof(struct ieee80211_vht_operation) +
1002                    ie_len_he_cap +
1003                    2 + 1 + sizeof(struct ieee80211_he_operation) +
1004                            sizeof(struct ieee80211_he_6ghz_oper) +
1005                    2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
1006                    ie_len_eht_cap +
1007                    2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
1008                            offsetof(struct ieee80211_eht_operation_info, optional) +
1009                    ifmsh->ie_len;
1010
1011         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
1012         /* need an skb for IE builders to operate on */
1013         skb = __dev_alloc_skb(max(head_len, tail_len), GFP_KERNEL);
1014
1015         if (!bcn || !skb)
1016                 goto out_free;
1017
1018         /*
1019          * pointers go into the block we allocated,
1020          * memory is | beacon_data | head | tail |
1021          */
1022         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
1023
1024         /* fill in the head */
1025         mgmt = skb_put_zero(skb, hdr_len);
1026         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1027                                           IEEE80211_STYPE_BEACON);
1028         eth_broadcast_addr(mgmt->da);
1029         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1030         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
1031         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
1032         mgmt->u.beacon.beacon_int =
1033                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
1034         mgmt->u.beacon.capab_info |= cpu_to_le16(
1035                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
1036
1037         pos = skb_put(skb, 2);
1038         *pos++ = WLAN_EID_SSID;
1039         *pos++ = 0x0;
1040
1041         rcu_read_lock();
1042         csa = rcu_dereference(ifmsh->csa);
1043         if (csa) {
1044                 enum nl80211_channel_type ct;
1045                 struct cfg80211_chan_def *chandef;
1046                 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
1047                              2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
1048
1049                 pos = skb_put_zero(skb, ie_len);
1050                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
1051                 *pos++ = 3;
1052                 *pos++ = 0x0;
1053                 *pos++ = ieee80211_frequency_to_channel(
1054                                 csa->settings.chandef.chan->center_freq);
1055                 bcn->cntdwn_current_counter = csa->settings.count;
1056                 bcn->cntdwn_counter_offsets[0] = hdr_len + 6;
1057                 *pos++ = csa->settings.count;
1058                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
1059                 *pos++ = 6;
1060                 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
1061                         *pos++ = ifmsh->mshcfg.dot11MeshTTL;
1062                         *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1063                 } else {
1064                         *pos++ = ifmsh->chsw_ttl;
1065                 }
1066                 *pos++ |= csa->settings.block_tx ?
1067                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
1068                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
1069                 pos += 2;
1070                 put_unaligned_le16(ifmsh->pre_value, pos);
1071                 pos += 2;
1072
1073                 switch (csa->settings.chandef.width) {
1074                 case NL80211_CHAN_WIDTH_40:
1075                         ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1076                         pos = skb_put_zero(skb, ie_len);
1077
1078                         *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
1079                         *pos++ = 1;                                 /* len */
1080                         ct = cfg80211_get_chandef_type(&csa->settings.chandef);
1081                         if (ct == NL80211_CHAN_HT40PLUS)
1082                                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1083                         else
1084                                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1085                         break;
1086                 case NL80211_CHAN_WIDTH_80:
1087                 case NL80211_CHAN_WIDTH_80P80:
1088                 case NL80211_CHAN_WIDTH_160:
1089                         /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
1090                         ie_len = 2 + 2 +
1091                                  sizeof(struct ieee80211_wide_bw_chansw_ie);
1092                         pos = skb_put_zero(skb, ie_len);
1093
1094                         *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
1095                         *pos++ = 5;                               /* len */
1096                         /* put sub IE */
1097                         chandef = &csa->settings.chandef;
1098                         ieee80211_ie_build_wide_bw_cs(pos, chandef);
1099                         break;
1100                 default:
1101                         break;
1102                 }
1103         }
1104         rcu_read_unlock();
1105
1106         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
1107             mesh_add_ds_params_ie(sdata, skb))
1108                 goto out_free;
1109
1110         bcn->head_len = skb->len;
1111         memcpy(bcn->head, skb->data, bcn->head_len);
1112
1113         /* now the tail */
1114         skb_trim(skb, 0);
1115         bcn->tail = bcn->head + bcn->head_len;
1116
1117         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
1118             mesh_add_rsn_ie(sdata, skb) ||
1119             mesh_add_ht_cap_ie(sdata, skb) ||
1120             mesh_add_ht_oper_ie(sdata, skb) ||
1121             mesh_add_meshid_ie(sdata, skb) ||
1122             mesh_add_meshconf_ie(sdata, skb) ||
1123             mesh_add_awake_window_ie(sdata, skb) ||
1124             mesh_add_vht_cap_ie(sdata, skb) ||
1125             mesh_add_vht_oper_ie(sdata, skb) ||
1126             mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
1127             mesh_add_he_oper_ie(sdata, skb) ||
1128             mesh_add_he_6ghz_cap_ie(sdata, skb) ||
1129             mesh_add_eht_cap_ie(sdata, skb, ie_len_eht_cap) ||
1130             mesh_add_eht_oper_ie(sdata, skb) ||
1131             mesh_add_vendor_ies(sdata, skb))
1132                 goto out_free;
1133
1134         bcn->tail_len = skb->len;
1135         memcpy(bcn->tail, skb->data, bcn->tail_len);
1136         ieee80211_mesh_update_bss_params(sdata, bcn->tail, bcn->tail_len);
1137         bcn->meshconf = (struct ieee80211_meshconf_ie *)
1138                                         (bcn->tail + ifmsh->meshconf_offset);
1139
1140         dev_kfree_skb(skb);
1141         rcu_assign_pointer(ifmsh->beacon, bcn);
1142         return 0;
1143 out_free:
1144         kfree(bcn);
1145         dev_kfree_skb(skb);
1146         return -ENOMEM;
1147 }
1148
1149 static int
1150 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
1151 {
1152         struct beacon_data *old_bcn;
1153         int ret;
1154
1155         old_bcn = sdata_dereference(sdata->u.mesh.beacon, sdata);
1156         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
1157         if (ret)
1158                 /* just reuse old beacon */
1159                 return ret;
1160
1161         if (old_bcn)
1162                 kfree_rcu(old_bcn, rcu_head);
1163         return 0;
1164 }
1165
1166 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1167                                        u64 changed)
1168 {
1169         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1170         unsigned long bits = changed;
1171         u32 bit;
1172
1173         if (!bits)
1174                 return;
1175
1176         /* if we race with running work, worst case this work becomes a noop */
1177         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
1178                 set_bit(bit, ifmsh->mbss_changed);
1179         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
1180         wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1181 }
1182
1183 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
1184 {
1185         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1186         struct ieee80211_local *local = sdata->local;
1187         u64 changed = BSS_CHANGED_BEACON |
1188                       BSS_CHANGED_BEACON_ENABLED |
1189                       BSS_CHANGED_HT |
1190                       BSS_CHANGED_BASIC_RATES |
1191                       BSS_CHANGED_BEACON_INT |
1192                       BSS_CHANGED_MCAST_RATE;
1193
1194         local->fif_other_bss++;
1195         /* mesh ifaces must set allmulti to forward mcast traffic */
1196         atomic_inc(&local->iff_allmultis);
1197         ieee80211_configure_filter(local);
1198
1199         ifmsh->mesh_cc_id = 0;  /* Disabled */
1200         /* register sync ops from extensible synchronization framework */
1201         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
1202         ifmsh->sync_offset_clockdrift_max = 0;
1203         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
1204         ieee80211_mesh_root_setup(ifmsh);
1205         wiphy_work_queue(local->hw.wiphy, &sdata->work);
1206         sdata->vif.bss_conf.ht_operation_mode =
1207                                 ifmsh->mshcfg.ht_opmode;
1208         sdata->vif.bss_conf.enable_beacon = true;
1209
1210         changed |= ieee80211_mps_local_status_update(sdata);
1211
1212         if (ieee80211_mesh_build_beacon(ifmsh)) {
1213                 ieee80211_stop_mesh(sdata);
1214                 return -ENOMEM;
1215         }
1216
1217         ieee80211_recalc_dtim(local, sdata);
1218         ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1219
1220         netif_carrier_on(sdata->dev);
1221         return 0;
1222 }
1223
1224 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
1225 {
1226         struct ieee80211_local *local = sdata->local;
1227         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1228         struct beacon_data *bcn;
1229
1230         netif_carrier_off(sdata->dev);
1231
1232         /* flush STAs and mpaths on this iface */
1233         sta_info_flush(sdata);
1234         ieee80211_free_keys(sdata, true);
1235         mesh_path_flush_by_iface(sdata);
1236
1237         /* stop the beacon */
1238         ifmsh->mesh_id_len = 0;
1239         sdata->vif.bss_conf.enable_beacon = false;
1240         sdata->beacon_rate_set = false;
1241         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1242         ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1243                                           BSS_CHANGED_BEACON_ENABLED);
1244
1245         /* remove beacon */
1246         bcn = sdata_dereference(ifmsh->beacon, sdata);
1247         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1248         kfree_rcu(bcn, rcu_head);
1249
1250         /* free all potentially still buffered group-addressed frames */
1251         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1252         skb_queue_purge(&ifmsh->ps.bc_buf);
1253
1254         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
1255         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
1256         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
1257
1258         /* clear any mesh work (for next join) we may have accrued */
1259         ifmsh->wrkq_flags = 0;
1260         memset(ifmsh->mbss_changed, 0, sizeof(ifmsh->mbss_changed));
1261
1262         local->fif_other_bss--;
1263         atomic_dec(&local->iff_allmultis);
1264         ieee80211_configure_filter(local);
1265 }
1266
1267 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1268 {
1269         int err;
1270
1271         /* if the current channel is a DFS channel, mark the channel as
1272          * unavailable.
1273          */
1274         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1275                                             &sdata->vif.bss_conf.chandef,
1276                                             NL80211_IFTYPE_MESH_POINT);
1277         if (err > 0)
1278                 cfg80211_radar_event(sdata->local->hw.wiphy,
1279                                      &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
1280 }
1281
1282 static bool
1283 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1284                                  struct ieee802_11_elems *elems, bool beacon)
1285 {
1286         struct cfg80211_csa_settings params;
1287         struct ieee80211_csa_ie csa_ie;
1288         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1289         struct ieee80211_supported_band *sband;
1290         int err;
1291         ieee80211_conn_flags_t conn_flags = 0;
1292         u32 vht_cap_info = 0;
1293
1294         sdata_assert_lock(sdata);
1295
1296         sband = ieee80211_get_sband(sdata);
1297         if (!sband)
1298                 return false;
1299
1300         switch (sdata->vif.bss_conf.chandef.width) {
1301         case NL80211_CHAN_WIDTH_20_NOHT:
1302                 conn_flags |= IEEE80211_CONN_DISABLE_HT;
1303                 fallthrough;
1304         case NL80211_CHAN_WIDTH_20:
1305                 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ;
1306                 fallthrough;
1307         case NL80211_CHAN_WIDTH_40:
1308                 conn_flags |= IEEE80211_CONN_DISABLE_VHT;
1309                 break;
1310         default:
1311                 break;
1312         }
1313
1314         if (elems->vht_cap_elem)
1315                 vht_cap_info =
1316                         le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1317
1318         memset(&params, 0, sizeof(params));
1319         err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1320                                            vht_cap_info,
1321                                            conn_flags, sdata->vif.addr,
1322                                            &csa_ie);
1323         if (err < 0)
1324                 return false;
1325         if (err)
1326                 return false;
1327
1328         /* Mark the channel unavailable if the reason for the switch is
1329          * regulatory.
1330          */
1331         if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1332                 ieee80211_mesh_csa_mark_radar(sdata);
1333
1334         params.chandef = csa_ie.chandef;
1335         params.count = csa_ie.count;
1336
1337         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
1338                                      IEEE80211_CHAN_DISABLED) ||
1339             !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
1340                                      NL80211_IFTYPE_MESH_POINT)) {
1341                 sdata_info(sdata,
1342                            "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1343                            sdata->vif.addr,
1344                            params.chandef.chan->center_freq,
1345                            params.chandef.width,
1346                            params.chandef.center_freq1,
1347                            params.chandef.center_freq2);
1348                 return false;
1349         }
1350
1351         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1352                                             &params.chandef,
1353                                             NL80211_IFTYPE_MESH_POINT);
1354         if (err < 0)
1355                 return false;
1356         if (err > 0 && !ifmsh->userspace_handles_dfs) {
1357                 sdata_info(sdata,
1358                            "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1359                            sdata->vif.addr,
1360                            params.chandef.chan->center_freq,
1361                            params.chandef.width,
1362                            params.chandef.center_freq1,
1363                            params.chandef.center_freq2);
1364                 return false;
1365         }
1366
1367         params.radar_required = err;
1368
1369         if (cfg80211_chandef_identical(&params.chandef,
1370                                        &sdata->vif.bss_conf.chandef)) {
1371                 mcsa_dbg(sdata,
1372                          "received csa with an identical chandef, ignoring\n");
1373                 return true;
1374         }
1375
1376         mcsa_dbg(sdata,
1377                  "received channel switch announcement to go to channel %d MHz\n",
1378                  params.chandef.chan->center_freq);
1379
1380         params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1381         if (beacon) {
1382                 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1383                 if (ifmsh->pre_value >= csa_ie.pre_value)
1384                         return false;
1385                 ifmsh->pre_value = csa_ie.pre_value;
1386         }
1387
1388         if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1389                 return false;
1390
1391         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1392
1393         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1394                                      &params) < 0)
1395                 return false;
1396
1397         return true;
1398 }
1399
1400 static void
1401 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1402                             struct ieee80211_mgmt *mgmt, size_t len)
1403 {
1404         struct ieee80211_local *local = sdata->local;
1405         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1406         struct sk_buff *presp;
1407         struct beacon_data *bcn;
1408         struct ieee80211_mgmt *hdr;
1409         struct ieee802_11_elems *elems;
1410         size_t baselen;
1411         u8 *pos;
1412
1413         pos = mgmt->u.probe_req.variable;
1414         baselen = (u8 *) pos - (u8 *) mgmt;
1415         if (baselen > len)
1416                 return;
1417
1418         elems = ieee802_11_parse_elems(pos, len - baselen, false, NULL);
1419         if (!elems)
1420                 return;
1421
1422         if (!elems->mesh_id)
1423                 goto free;
1424
1425         /* 802.11-2012 10.1.4.3.2 */
1426         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1427              !is_broadcast_ether_addr(mgmt->da)) ||
1428             elems->ssid_len != 0)
1429                 goto free;
1430
1431         if (elems->mesh_id_len != 0 &&
1432             (elems->mesh_id_len != ifmsh->mesh_id_len ||
1433              memcmp(elems->mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1434                 goto free;
1435
1436         rcu_read_lock();
1437         bcn = rcu_dereference(ifmsh->beacon);
1438
1439         if (!bcn)
1440                 goto out;
1441
1442         presp = dev_alloc_skb(local->tx_headroom +
1443                               bcn->head_len + bcn->tail_len);
1444         if (!presp)
1445                 goto out;
1446
1447         skb_reserve(presp, local->tx_headroom);
1448         skb_put_data(presp, bcn->head, bcn->head_len);
1449         skb_put_data(presp, bcn->tail, bcn->tail_len);
1450         hdr = (struct ieee80211_mgmt *) presp->data;
1451         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1452                                          IEEE80211_STYPE_PROBE_RESP);
1453         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1454         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1455         ieee80211_tx_skb(sdata, presp);
1456 out:
1457         rcu_read_unlock();
1458 free:
1459         kfree(elems);
1460 }
1461
1462 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1463                                         u16 stype,
1464                                         struct ieee80211_mgmt *mgmt,
1465                                         size_t len,
1466                                         struct ieee80211_rx_status *rx_status)
1467 {
1468         struct ieee80211_local *local = sdata->local;
1469         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1470         struct ieee802_11_elems *elems;
1471         struct ieee80211_channel *channel;
1472         size_t baselen;
1473         int freq;
1474         enum nl80211_band band = rx_status->band;
1475
1476         /* ignore ProbeResp to foreign address */
1477         if (stype == IEEE80211_STYPE_PROBE_RESP &&
1478             !ether_addr_equal(mgmt->da, sdata->vif.addr))
1479                 return;
1480
1481         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1482         if (baselen > len)
1483                 return;
1484
1485         elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1486                                        len - baselen,
1487                                        false, NULL);
1488         if (!elems)
1489                 return;
1490
1491         /* ignore non-mesh or secure / unsecure mismatch */
1492         if ((!elems->mesh_id || !elems->mesh_config) ||
1493             (elems->rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1494             (!elems->rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1495                 goto free;
1496
1497         if (elems->ds_params)
1498                 freq = ieee80211_channel_to_frequency(elems->ds_params[0], band);
1499         else
1500                 freq = rx_status->freq;
1501
1502         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1503
1504         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1505                 goto free;
1506
1507         if (mesh_matches_local(sdata, elems)) {
1508                 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1509                         sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1510                 if (!sdata->u.mesh.user_mpm ||
1511                     sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1512                     sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1513                         mesh_neighbour_update(sdata, mgmt->sa, elems,
1514                                               rx_status);
1515
1516                 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1517                     !sdata->vif.bss_conf.csa_active)
1518                         ieee80211_mesh_process_chnswitch(sdata, elems, true);
1519         }
1520
1521         if (ifmsh->sync_ops)
1522                 ifmsh->sync_ops->rx_bcn_presp(sdata, stype, mgmt, len,
1523                                               elems->mesh_config, rx_status);
1524 free:
1525         kfree(elems);
1526 }
1527
1528 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed)
1529 {
1530         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1531         struct mesh_csa_settings *tmp_csa_settings;
1532         int ret = 0;
1533
1534         /* Reset the TTL value and Initiator flag */
1535         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1536         ifmsh->chsw_ttl = 0;
1537
1538         /* Remove the CSA and MCSP elements from the beacon */
1539         tmp_csa_settings = sdata_dereference(ifmsh->csa, sdata);
1540         RCU_INIT_POINTER(ifmsh->csa, NULL);
1541         if (tmp_csa_settings)
1542                 kfree_rcu(tmp_csa_settings, rcu_head);
1543         ret = ieee80211_mesh_rebuild_beacon(sdata);
1544         if (ret)
1545                 return -EINVAL;
1546
1547         *changed |= BSS_CHANGED_BEACON;
1548
1549         mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1550                  sdata->vif.bss_conf.chandef.chan->center_freq);
1551         return 0;
1552 }
1553
1554 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1555                               struct cfg80211_csa_settings *csa_settings,
1556                               u64 *changed)
1557 {
1558         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1559         struct mesh_csa_settings *tmp_csa_settings;
1560         int ret = 0;
1561
1562         lockdep_assert_held(&sdata->wdev.mtx);
1563
1564         tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1565                                    GFP_ATOMIC);
1566         if (!tmp_csa_settings)
1567                 return -ENOMEM;
1568
1569         memcpy(&tmp_csa_settings->settings, csa_settings,
1570                sizeof(struct cfg80211_csa_settings));
1571
1572         rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1573
1574         ret = ieee80211_mesh_rebuild_beacon(sdata);
1575         if (ret) {
1576                 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1577                 RCU_INIT_POINTER(ifmsh->csa, NULL);
1578                 kfree_rcu(tmp_csa_settings, rcu_head);
1579                 return ret;
1580         }
1581
1582         *changed |= BSS_CHANGED_BEACON;
1583         return 0;
1584 }
1585
1586 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1587                                struct ieee80211_mgmt *mgmt, size_t len,
1588                                struct ieee802_11_elems *elems)
1589 {
1590         struct ieee80211_mgmt *mgmt_fwd;
1591         struct sk_buff *skb;
1592         struct ieee80211_local *local = sdata->local;
1593
1594         skb = dev_alloc_skb(local->tx_headroom + len);
1595         if (!skb)
1596                 return -ENOMEM;
1597         skb_reserve(skb, local->tx_headroom);
1598         mgmt_fwd = skb_put(skb, len);
1599
1600         elems->mesh_chansw_params_ie->mesh_ttl--;
1601         elems->mesh_chansw_params_ie->mesh_flags &=
1602                 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1603
1604         memcpy(mgmt_fwd, mgmt, len);
1605         eth_broadcast_addr(mgmt_fwd->da);
1606         memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1607         memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1608
1609         ieee80211_tx_skb(sdata, skb);
1610         return 0;
1611 }
1612
1613 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1614                               struct ieee80211_mgmt *mgmt, size_t len)
1615 {
1616         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1617         struct ieee802_11_elems *elems;
1618         u16 pre_value;
1619         bool fwd_csa = true;
1620         size_t baselen;
1621         u8 *pos;
1622
1623         if (mgmt->u.action.u.measurement.action_code !=
1624             WLAN_ACTION_SPCT_CHL_SWITCH)
1625                 return;
1626
1627         pos = mgmt->u.action.u.chan_switch.variable;
1628         baselen = offsetof(struct ieee80211_mgmt,
1629                            u.action.u.chan_switch.variable);
1630         elems = ieee802_11_parse_elems(pos, len - baselen, true, NULL);
1631         if (!elems)
1632                 return;
1633
1634         if (!mesh_matches_local(sdata, elems))
1635                 goto free;
1636
1637         ifmsh->chsw_ttl = elems->mesh_chansw_params_ie->mesh_ttl;
1638         if (!--ifmsh->chsw_ttl)
1639                 fwd_csa = false;
1640
1641         pre_value = le16_to_cpu(elems->mesh_chansw_params_ie->mesh_pre_value);
1642         if (ifmsh->pre_value >= pre_value)
1643                 goto free;
1644
1645         ifmsh->pre_value = pre_value;
1646
1647         if (!sdata->vif.bss_conf.csa_active &&
1648             !ieee80211_mesh_process_chnswitch(sdata, elems, false)) {
1649                 mcsa_dbg(sdata, "Failed to process CSA action frame");
1650                 goto free;
1651         }
1652
1653         /* forward or re-broadcast the CSA frame */
1654         if (fwd_csa) {
1655                 if (mesh_fwd_csa_frame(sdata, mgmt, len, elems) < 0)
1656                         mcsa_dbg(sdata, "Failed to forward the CSA frame");
1657         }
1658 free:
1659         kfree(elems);
1660 }
1661
1662 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1663                                           struct ieee80211_mgmt *mgmt,
1664                                           size_t len,
1665                                           struct ieee80211_rx_status *rx_status)
1666 {
1667         switch (mgmt->u.action.category) {
1668         case WLAN_CATEGORY_SELF_PROTECTED:
1669                 switch (mgmt->u.action.u.self_prot.action_code) {
1670                 case WLAN_SP_MESH_PEERING_OPEN:
1671                 case WLAN_SP_MESH_PEERING_CLOSE:
1672                 case WLAN_SP_MESH_PEERING_CONFIRM:
1673                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1674                         break;
1675                 }
1676                 break;
1677         case WLAN_CATEGORY_MESH_ACTION:
1678                 if (mesh_action_is_path_sel(mgmt))
1679                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1680                 break;
1681         case WLAN_CATEGORY_SPECTRUM_MGMT:
1682                 mesh_rx_csa_frame(sdata, mgmt, len);
1683                 break;
1684         }
1685 }
1686
1687 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1688                                    struct sk_buff *skb)
1689 {
1690         struct ieee80211_rx_status *rx_status;
1691         struct ieee80211_mgmt *mgmt;
1692         u16 stype;
1693
1694         sdata_lock(sdata);
1695
1696         /* mesh already went down */
1697         if (!sdata->u.mesh.mesh_id_len)
1698                 goto out;
1699
1700         rx_status = IEEE80211_SKB_RXCB(skb);
1701         mgmt = (struct ieee80211_mgmt *) skb->data;
1702         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1703
1704         switch (stype) {
1705         case IEEE80211_STYPE_PROBE_RESP:
1706         case IEEE80211_STYPE_BEACON:
1707                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1708                                             rx_status);
1709                 break;
1710         case IEEE80211_STYPE_PROBE_REQ:
1711                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1712                 break;
1713         case IEEE80211_STYPE_ACTION:
1714                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1715                 break;
1716         }
1717 out:
1718         sdata_unlock(sdata);
1719 }
1720
1721 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1722 {
1723         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1724         u32 bit;
1725         u64 changed = 0;
1726
1727         for_each_set_bit(bit, ifmsh->mbss_changed,
1728                          sizeof(changed) * BITS_PER_BYTE) {
1729                 clear_bit(bit, ifmsh->mbss_changed);
1730                 changed |= BIT(bit);
1731         }
1732
1733         if (sdata->vif.bss_conf.enable_beacon &&
1734             (changed & (BSS_CHANGED_BEACON |
1735                         BSS_CHANGED_HT |
1736                         BSS_CHANGED_BASIC_RATES |
1737                         BSS_CHANGED_BEACON_INT)))
1738                 if (ieee80211_mesh_rebuild_beacon(sdata))
1739                         return;
1740
1741         ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1742 }
1743
1744 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1745 {
1746         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1747
1748         sdata_lock(sdata);
1749
1750         /* mesh already went down */
1751         if (!sdata->u.mesh.mesh_id_len)
1752                 goto out;
1753
1754         if (ifmsh->preq_queue_len &&
1755             time_after(jiffies,
1756                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1757                 mesh_path_start_discovery(sdata);
1758
1759         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1760                 ieee80211_mesh_housekeeping(sdata);
1761
1762         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1763                 ieee80211_mesh_rootpath(sdata);
1764
1765         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1766                 mesh_sync_adjust_tsf(sdata);
1767
1768         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1769                 mesh_bss_info_changed(sdata);
1770 out:
1771         sdata_unlock(sdata);
1772 }
1773
1774
1775 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1776 {
1777         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1778         static u8 zero_addr[ETH_ALEN] = {};
1779
1780         timer_setup(&ifmsh->housekeeping_timer,
1781                     ieee80211_mesh_housekeeping_timer, 0);
1782
1783         ifmsh->accepting_plinks = true;
1784         atomic_set(&ifmsh->mpaths, 0);
1785         mesh_rmc_init(sdata);
1786         ifmsh->last_preq = jiffies;
1787         ifmsh->next_perr = jiffies;
1788         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1789         /* Allocate all mesh structures when creating the first mesh interface. */
1790         if (!mesh_allocated)
1791                 ieee80211s_init();
1792
1793         mesh_pathtbl_init(sdata);
1794
1795         timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1796         timer_setup(&ifmsh->mesh_path_root_timer,
1797                     ieee80211_mesh_path_root_timer, 0);
1798         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1799         skb_queue_head_init(&ifmsh->ps.bc_buf);
1800         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1801         spin_lock_init(&ifmsh->sync_offset_lock);
1802         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1803
1804         sdata->vif.bss_conf.bssid = zero_addr;
1805 }
1806
1807 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1808 {
1809         mesh_rmc_free(sdata);
1810         mesh_pathtbl_unregister(sdata);
1811 }