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  * Returns: %true if both nodes belong to the same mesh
  61  */
  62 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
  63                         struct ieee802_11_elems *ie)
  64 {
  65         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  66         u32 basic_rates = 0;
  67         struct cfg80211_chan_def sta_chan_def;
  68         struct ieee80211_supported_band *sband;
  69         u32 vht_cap_info = 0;
  70
  71         /*
  72          * As support for each feature is added, check for matching
  73          * - On mesh config capabilities
  74          *   - Power Save Support En
  75          *   - Sync support enabled
  76          *   - Sync support active
  77          *   - Sync support required from peer
  78          *   - MDA enabled
  79          * - Power management control on fc
  80          */
  81         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
  82              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  83              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  84              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  85              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  86              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  87              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  88                 return false;
  89
  90         sband = ieee80211_get_sband(sdata);
  91         if (!sband)
  92                 return false;
  93
  94         ieee80211_sta_get_rates(sdata, ie, sband->band,
  95                                 &basic_rates);
  96
  97         if (sdata->vif.bss_conf.basic_rates != basic_rates)
  98                 return false;
  99
 100         cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
 101                                 NL80211_CHAN_NO_HT);
 102         ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
 103
 104         if (ie->vht_cap_elem)
 105                 vht_cap_info = le32_to_cpu(ie->vht_cap_elem->vht_cap_info);
 106
 107         ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info,
 108                                    ie->vht_operation, ie->ht_operation,
 109                                    &sta_chan_def);
 110         ieee80211_chandef_he_6ghz_oper(sdata, ie->he_operation, ie->eht_operation,
 111                                        &sta_chan_def);
 112
 113         if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
 114                                          &sta_chan_def))
 115                 return false;
 116
 117         return true;
 118 }
 119
 120 /**
 121  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 122  *
 123  * @ie: information elements of a management frame from the mesh peer
 124  *
 125  * Returns: %true if the mesh peer is willing to establish peer links
 126  */
 127 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 128 {
 129         return (ie->mesh_config->meshconf_cap &
 130                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 131 }
 132
 133 /**
 134  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
 135  *
 136  * @sdata: mesh interface in which mesh beacons are going to be updated
 137  *
 138  * Returns: beacon changed flag if the beacon content changed.
 139  */
 140 u64 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 141 {
 142         bool free_plinks;
 143         u64 changed = 0;
 144
 145         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 146          * the mesh interface might be able to establish plinks with peers that
 147          * are already on the table but are not on PLINK_ESTAB state. However,
 148          * in general the mesh interface is not accepting peer link requests
 149          * from new peers, and that must be reflected in the beacon
 150          */
 151         free_plinks = mesh_plink_availables(sdata);
 152
 153         if (free_plinks != sdata->u.mesh.accepting_plinks) {
 154                 sdata->u.mesh.accepting_plinks = free_plinks;
 155                 changed = BSS_CHANGED_BEACON;
 156         }
 157
 158         return changed;
 159 }
 160
 161 /*
 162  * mesh_sta_cleanup - clean up any mesh sta state
 163  *
 164  * @sta: mesh sta to clean up.
 165  */
 166 void mesh_sta_cleanup(struct sta_info *sta)
 167 {
 168         struct ieee80211_sub_if_data *sdata = sta->sdata;
 169         u64 changed = mesh_plink_deactivate(sta);
 170
 171         if (changed)
 172                 ieee80211_mbss_info_change_notify(sdata, changed);
 173 }
 174
 175 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 176 {
 177         int i;
 178
 179         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 180         if (!sdata->u.mesh.rmc)
 181                 return -ENOMEM;
 182         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 183         for (i = 0; i < RMC_BUCKETS; i++)
 184                 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
 185         return 0;
 186 }
 187
 188 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 189 {
 190         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 191         struct rmc_entry *p;
 192         struct hlist_node *n;
 193         int i;
 194
 195         if (!sdata->u.mesh.rmc)
 196                 return;
 197
 198         for (i = 0; i < RMC_BUCKETS; i++) {
 199                 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 200                         hlist_del(&p->list);
 201                         kmem_cache_free(rm_cache, p);
 202                 }
 203         }
 204
 205         kfree(rmc);
 206         sdata->u.mesh.rmc = NULL;
 207 }
 208
 209 /**
 210  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 211  *
 212  * @sdata:      interface
 213  * @sa:         source address
 214  * @mesh_hdr:   mesh_header
 215  *
 216  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 217  *
 218  * Checks using the source address and the mesh sequence number if we have
 219  * received this frame lately. If the frame is not in the cache, it is added to
 220  * it.
 221  */
 222 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
 223                    const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
 224 {
 225         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 226         u32 seqnum = 0;
 227         int entries = 0;
 228         u8 idx;
 229         struct rmc_entry *p;
 230         struct hlist_node *n;
 231
 232         if (!rmc)
 233                 return -1;
 234
 235         /* Don't care about endianness since only match matters */
 236         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 237         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 238         hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 239                 ++entries;
 240                 if (time_after(jiffies, p->exp_time) ||
 241                     entries == RMC_QUEUE_MAX_LEN) {
 242                         hlist_del(&p->list);
 243                         kmem_cache_free(rm_cache, p);
 244                         --entries;
 245                 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
 246                         return -1;
 247         }
 248
 249         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 250         if (!p)
 251                 return 0;
 252
 253         p->seqnum = seqnum;
 254         p->exp_time = jiffies + RMC_TIMEOUT;
 255         memcpy(p->sa, sa, ETH_ALEN);
 256         hlist_add_head(&p->list, &rmc->bucket[idx]);
 257         return 0;
 258 }
 259
 260 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
 261                          struct sk_buff *skb)
 262 {
 263         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 264         u8 *pos, neighbors;
 265         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 266         bool is_connected_to_gate = ifmsh->num_gates > 0 ||
 267                 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
 268                 ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
 269         bool is_connected_to_as = ifmsh->mshcfg.dot11MeshConnectedToAuthServer;
 270
 271         if (skb_tailroom(skb) < 2 + meshconf_len)
 272                 return -ENOMEM;
 273
 274         pos = skb_put(skb, 2 + meshconf_len);
 275         *pos++ = WLAN_EID_MESH_CONFIG;
 276         *pos++ = meshconf_len;
 277
 278         /* save a pointer for quick updates in pre-tbtt */
 279         ifmsh->meshconf_offset = pos - skb->data;
 280
 281         /* Active path selection protocol ID */
 282         *pos++ = ifmsh->mesh_pp_id;
 283         /* Active path selection metric ID   */
 284         *pos++ = ifmsh->mesh_pm_id;
 285         /* Congestion control mode identifier */
 286         *pos++ = ifmsh->mesh_cc_id;
 287         /* Synchronization protocol identifier */
 288         *pos++ = ifmsh->mesh_sp_id;
 289         /* Authentication Protocol identifier */
 290         *pos++ = ifmsh->mesh_auth_id;
 291         /* Mesh Formation Info - number of neighbors */
 292         neighbors = atomic_read(&ifmsh->estab_plinks);
 293         neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
 294         *pos++ = (is_connected_to_as << 7) |
 295                  (neighbors << 1) |
 296                  is_connected_to_gate;
 297         /* Mesh capability */
 298         *pos = 0x00;
 299         *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
 300                         IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
 301         *pos |= ifmsh->accepting_plinks ?
 302                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 303         /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
 304         *pos |= ifmsh->ps_peers_deep_sleep ?
 305                         IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
 306         return 0;
 307 }
 308
 309 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 310 {
 311         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 312         u8 *pos;
 313
 314         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 315                 return -ENOMEM;
 316
 317         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 318         *pos++ = WLAN_EID_MESH_ID;
 319         *pos++ = ifmsh->mesh_id_len;
 320         if (ifmsh->mesh_id_len)
 321                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 322
 323         return 0;
 324 }
 325
 326 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
 327                                     struct sk_buff *skb)
 328 {
 329         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 330         u8 *pos;
 331
 332         /* see IEEE802.11-2012 13.14.6 */
 333         if (ifmsh->ps_peers_light_sleep == 0 &&
 334             ifmsh->ps_peers_deep_sleep == 0 &&
 335             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
 336                 return 0;
 337
 338         if (skb_tailroom(skb) < 4)
 339                 return -ENOMEM;
 340
 341         pos = skb_put(skb, 2 + 2);
 342         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
 343         *pos++ = 2;
 344         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 345
 346         return 0;
 347 }
 348
 349 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 350                         struct sk_buff *skb)
 351 {
 352         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 353         u8 offset, len;
 354         const u8 *data;
 355
 356         if (!ifmsh->ie || !ifmsh->ie_len)
 357                 return 0;
 358
 359         /* fast-forward to vendor IEs */
 360         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 361
 362         if (offset < ifmsh->ie_len) {
 363                 len = ifmsh->ie_len - offset;
 364                 data = ifmsh->ie + offset;
 365                 if (skb_tailroom(skb) < len)
 366                         return -ENOMEM;
 367                 skb_put_data(skb, data, len);
 368         }
 369
 370         return 0;
 371 }
 372
 373 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 374 {
 375         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 376         u8 len = 0;
 377         const u8 *data;
 378
 379         if (!ifmsh->ie || !ifmsh->ie_len)
 380                 return 0;
 381
 382         /* find RSN IE */
 383         data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
 384         if (!data)
 385                 return 0;
 386
 387         len = data[1] + 2;
 388
 389         if (skb_tailroom(skb) < len)
 390                 return -ENOMEM;
 391         skb_put_data(skb, data, len);
 392
 393         return 0;
 394 }
 395
 396 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
 397                                  struct sk_buff *skb)
 398 {
 399         struct ieee80211_chanctx_conf *chanctx_conf;
 400         struct ieee80211_channel *chan;
 401         u8 *pos;
 402
 403         if (skb_tailroom(skb) < 3)
 404                 return -ENOMEM;
 405
 406         rcu_read_lock();
 407         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 408         if (WARN_ON(!chanctx_conf)) {
 409                 rcu_read_unlock();
 410                 return -EINVAL;
 411         }
 412         chan = chanctx_conf->def.chan;
 413         rcu_read_unlock();
 414
 415         pos = skb_put(skb, 2 + 1);
 416         *pos++ = WLAN_EID_DS_PARAMS;
 417         *pos++ = 1;
 418         *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 419
 420         return 0;
 421 }
 422
 423 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
 424                        struct sk_buff *skb)
 425 {
 426         struct ieee80211_supported_band *sband;
 427         u8 *pos;
 428
 429         sband = ieee80211_get_sband(sdata);
 430         if (!sband)
 431                 return -EINVAL;
 432
 433         /* HT not allowed in 6 GHz */
 434         if (sband->band == NL80211_BAND_6GHZ)
 435                 return 0;
 436
 437         if (!sband->ht_cap.ht_supported ||
 438             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 439             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 440             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 441                 return 0;
 442
 443         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 444                 return -ENOMEM;
 445
 446         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 447         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 448
 449         return 0;
 450 }
 451
 452 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
 453                         struct sk_buff *skb)
 454 {
 455         struct ieee80211_local *local = sdata->local;
 456         struct ieee80211_chanctx_conf *chanctx_conf;
 457         struct ieee80211_channel *channel;
 458         struct ieee80211_supported_band *sband;
 459         struct ieee80211_sta_ht_cap *ht_cap;
 460         u8 *pos;
 461
 462         rcu_read_lock();
 463         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 464         if (WARN_ON(!chanctx_conf)) {
 465                 rcu_read_unlock();
 466                 return -EINVAL;
 467         }
 468         channel = chanctx_conf->def.chan;
 469         rcu_read_unlock();
 470
 471         sband = local->hw.wiphy->bands[channel->band];
 472         ht_cap = &sband->ht_cap;
 473
 474         /* HT not allowed in 6 GHz */
 475         if (sband->band == NL80211_BAND_6GHZ)
 476                 return 0;
 477
 478         if (!ht_cap->ht_supported ||
 479             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 480             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 481             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 482                 return 0;
 483
 484         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 485                 return -ENOMEM;
 486
 487         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 488         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
 489                                    sdata->vif.bss_conf.ht_operation_mode,
 490                                    false);
 491
 492         return 0;
 493 }
 494
 495 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
 496                         struct sk_buff *skb)
 497 {
 498         struct ieee80211_supported_band *sband;
 499         u8 *pos;
 500
 501         sband = ieee80211_get_sband(sdata);
 502         if (!sband)
 503                 return -EINVAL;
 504
 505         /* VHT not allowed in 6 GHz */
 506         if (sband->band == NL80211_BAND_6GHZ)
 507                 return 0;
 508
 509         if (!sband->vht_cap.vht_supported ||
 510             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 511             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 512             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 513                 return 0;
 514
 515         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
 516                 return -ENOMEM;
 517
 518         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
 519         ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
 520
 521         return 0;
 522 }
 523
 524 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
 525                          struct sk_buff *skb)
 526 {
 527         struct ieee80211_local *local = sdata->local;
 528         struct ieee80211_chanctx_conf *chanctx_conf;
 529         struct ieee80211_channel *channel;
 530         struct ieee80211_supported_band *sband;
 531         struct ieee80211_sta_vht_cap *vht_cap;
 532         u8 *pos;
 533
 534         rcu_read_lock();
 535         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 536         if (WARN_ON(!chanctx_conf)) {
 537                 rcu_read_unlock();
 538                 return -EINVAL;
 539         }
 540         channel = chanctx_conf->def.chan;
 541         rcu_read_unlock();
 542
 543         sband = local->hw.wiphy->bands[channel->band];
 544         vht_cap = &sband->vht_cap;
 545
 546         /* VHT not allowed in 6 GHz */
 547         if (sband->band == NL80211_BAND_6GHZ)
 548                 return 0;
 549
 550         if (!vht_cap->vht_supported ||
 551             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 552             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 553             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 554                 return 0;
 555
 556         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
 557                 return -ENOMEM;
 558
 559         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 560         ieee80211_ie_build_vht_oper(pos, vht_cap,
 561                                     &sdata->vif.bss_conf.chandef);
 562
 563         return 0;
 564 }
 565
 566 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
 567                        struct sk_buff *skb, u8 ie_len)
 568 {
 569         const struct ieee80211_sta_he_cap *he_cap;
 570         struct ieee80211_supported_band *sband;
 571         u8 *pos;
 572
 573         sband = ieee80211_get_sband(sdata);
 574         if (!sband)
 575                 return -EINVAL;
 576
 577         he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 578
 579         if (!he_cap ||
 580             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 581             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 582             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 583                 return 0;
 584
 585         if (skb_tailroom(skb) < ie_len)
 586                 return -ENOMEM;
 587
 588         pos = skb_put(skb, ie_len);
 589         ieee80211_ie_build_he_cap(0, pos, he_cap, pos + ie_len);
 590
 591         return 0;
 592 }
 593
 594 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
 595                         struct sk_buff *skb)
 596 {
 597         const struct ieee80211_sta_he_cap *he_cap;
 598         struct ieee80211_supported_band *sband;
 599         u32 len;
 600         u8 *pos;
 601
 602         sband = ieee80211_get_sband(sdata);
 603         if (!sband)
 604                 return -EINVAL;
 605
 606         he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 607         if (!he_cap ||
 608             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 609             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 610             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 611                 return 0;
 612
 613         len = 2 + 1 + sizeof(struct ieee80211_he_operation);
 614         if (sdata->vif.bss_conf.chandef.chan->band == NL80211_BAND_6GHZ)
 615                 len += sizeof(struct ieee80211_he_6ghz_oper);
 616
 617         if (skb_tailroom(skb) < len)
 618                 return -ENOMEM;
 619
 620         pos = skb_put(skb, len);
 621         ieee80211_ie_build_he_oper(pos, &sdata->vif.bss_conf.chandef);
 622
 623         return 0;
 624 }
 625
 626 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata,
 627                             struct sk_buff *skb)
 628 {
 629         struct ieee80211_supported_band *sband;
 630         const struct ieee80211_sband_iftype_data *iftd;
 631
 632         sband = ieee80211_get_sband(sdata);
 633         if (!sband)
 634                 return -EINVAL;
 635
 636         iftd = ieee80211_get_sband_iftype_data(sband,
 637                                                NL80211_IFTYPE_MESH_POINT);
 638         /* The device doesn't support HE in mesh mode or at all */
 639         if (!iftd)
 640                 return 0;
 641
 642         ieee80211_ie_build_he_6ghz_cap(sdata, sdata->deflink.smps_mode, skb);
 643         return 0;
 644 }
 645
 646 int mesh_add_eht_cap_ie(struct ieee80211_sub_if_data *sdata,
 647                         struct sk_buff *skb, u8 ie_len)
 648 {
 649         const struct ieee80211_sta_he_cap *he_cap;
 650         const struct ieee80211_sta_eht_cap *eht_cap;
 651         struct ieee80211_supported_band *sband;
 652         u8 *pos;
 653
 654         sband = ieee80211_get_sband(sdata);
 655         if (!sband)
 656                 return -EINVAL;
 657
 658         he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 659         eht_cap = ieee80211_get_eht_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 660         if (!he_cap || !eht_cap ||
 661             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 662             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 663             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 664                 return 0;
 665
 666         if (skb_tailroom(skb) < ie_len)
 667                 return -ENOMEM;
 668
 669         pos = skb_put(skb, ie_len);
 670         ieee80211_ie_build_eht_cap(pos, he_cap, eht_cap, pos + ie_len, false);
 671
 672         return 0;
 673 }
 674
 675 int mesh_add_eht_oper_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 676 {
 677         const struct ieee80211_sta_eht_cap *eht_cap;
 678         struct ieee80211_supported_band *sband;
 679         u32 len;
 680         u8 *pos;
 681
 682         sband = ieee80211_get_sband(sdata);
 683         if (!sband)
 684                 return -EINVAL;
 685
 686         eht_cap = ieee80211_get_eht_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 687         if (!eht_cap ||
 688             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 689             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 690             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 691                 return 0;
 692
 693         len = 2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
 694                       offsetof(struct ieee80211_eht_operation_info, optional);
 695
 696         if (skb_tailroom(skb) < len)
 697                 return -ENOMEM;
 698
 699         pos = skb_put(skb, len);
 700         ieee80211_ie_build_eht_oper(pos, &sdata->vif.bss_conf.chandef, eht_cap);
 701
 702         return 0;
 703 }
 704
 705 static void ieee80211_mesh_path_timer(struct timer_list *t)
 706 {
 707         struct ieee80211_sub_if_data *sdata =
 708                 from_timer(sdata, t, u.mesh.mesh_path_timer);
 709
 710         wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
 711 }
 712
 713 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
 714 {
 715         struct ieee80211_sub_if_data *sdata =
 716                 from_timer(sdata, t, u.mesh.mesh_path_root_timer);
 717         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 718
 719         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 720
 721         wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
 722 }
 723
 724 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 725 {
 726         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 727                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 728         else {
 729                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 730                 /* stop running timer */
 731                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 732         }
 733 }
 734
 735 static void
 736 ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data *sdata,
 737                                  u8 *ie, u8 ie_len)
 738 {
 739         struct ieee80211_supported_band *sband;
 740         const struct element *cap;
 741         const struct ieee80211_he_operation *he_oper = NULL;
 742
 743         sband = ieee80211_get_sband(sdata);
 744         if (!sband)
 745                 return;
 746
 747         if (!ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT) ||
 748             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 749             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 750             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 751                 return;
 752
 753         sdata->vif.bss_conf.he_support = true;
 754
 755         cap = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ie_len);
 756         if (cap && cap->datalen >= 1 + sizeof(*he_oper) &&
 757             cap->datalen >= 1 + ieee80211_he_oper_size(cap->data + 1))
 758                 he_oper = (void *)(cap->data + 1);
 759
 760         if (he_oper)
 761                 sdata->vif.bss_conf.he_oper.params =
 762                         __le32_to_cpu(he_oper->he_oper_params);
 763
 764         sdata->vif.bss_conf.eht_support =
 765                 !!ieee80211_get_eht_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 766 }
 767
 768 bool ieee80211_mesh_xmit_fast(struct ieee80211_sub_if_data *sdata,
 769                               struct sk_buff *skb, u32 ctrl_flags)
 770 {
 771         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 772         struct ieee80211_mesh_fast_tx_key key = {
 773                 .type = MESH_FAST_TX_TYPE_LOCAL
 774         };
 775         struct ieee80211_mesh_fast_tx *entry;
 776         struct ieee80211s_hdr *meshhdr;
 777         u8 sa[ETH_ALEN] __aligned(2);
 778         struct tid_ampdu_tx *tid_tx;
 779         struct sta_info *sta;
 780         bool copy_sa = false;
 781         u16 ethertype;
 782         u8 tid;
 783
 784         if (ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP)
 785                 return false;
 786
 787         if (ifmsh->mshcfg.dot11MeshNolearn)
 788                 return false;
 789
 790         /* Add support for these cases later */
 791         if (ifmsh->ps_peers_light_sleep || ifmsh->ps_peers_deep_sleep)
 792                 return false;
 793
 794         if (is_multicast_ether_addr(skb->data))
 795                 return false;
 796
 797         ethertype = (skb->data[12] << 8) | skb->data[13];
 798         if (ethertype < ETH_P_802_3_MIN)
 799                 return false;
 800
 801         if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
 802                 return false;
 803
 804         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 805                 skb_set_transport_header(skb, skb_checksum_start_offset(skb));
 806                 if (skb_checksum_help(skb))
 807                         return false;
 808         }
 809
 810         ether_addr_copy(key.addr, skb->data);
 811         if (!ether_addr_equal(skb->data + ETH_ALEN, sdata->vif.addr))
 812                 key.type = MESH_FAST_TX_TYPE_PROXIED;
 813         entry = mesh_fast_tx_get(sdata, &key);
 814         if (!entry)
 815                 return false;
 816
 817         if (skb_headroom(skb) < entry->hdrlen + entry->fast_tx.hdr_len)
 818                 return false;
 819
 820         sta = rcu_dereference(entry->mpath->next_hop);
 821         if (!sta)
 822                 return false;
 823
 824         tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
 825         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 826         if (tid_tx) {
 827                 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
 828                         return false;
 829                 if (tid_tx->timeout)
 830                         tid_tx->last_tx = jiffies;
 831         }
 832
 833         skb = skb_share_check(skb, GFP_ATOMIC);
 834         if (!skb)
 835                 return true;
 836
 837         skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb));
 838
 839         meshhdr = (struct ieee80211s_hdr *)entry->hdr;
 840         if ((meshhdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) {
 841                 /* preserve SA from eth header for 6-addr frames */
 842                 ether_addr_copy(sa, skb->data + ETH_ALEN);
 843                 copy_sa = true;
 844         }
 845
 846         memcpy(skb_push(skb, entry->hdrlen - 2 * ETH_ALEN), entry->hdr,
 847                entry->hdrlen);
 848
 849         meshhdr = (struct ieee80211s_hdr *)skb->data;
 850         put_unaligned_le32(atomic_inc_return(&sdata->u.mesh.mesh_seqnum),
 851                            &meshhdr->seqnum);
 852         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 853         if (copy_sa)
 854             ether_addr_copy(meshhdr->eaddr2, sa);
 855
 856         skb_push(skb, 2 * ETH_ALEN);
 857         __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx,
 858                               entry->mpath->dst, sdata->vif.addr);
 859
 860         return true;
 861 }
 862
 863 /**
 864  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 865  * @hdr:        802.11 frame header
 866  * @fc:         frame control field
 867  * @meshda:     destination address in the mesh
 868  * @meshsa:     source address in the mesh.  Same as TA, as frame is
 869  *              locally originated.
 870  *
 871  * Returns: the length of the 802.11 frame header (excludes mesh control header)
 872  */
 873 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 874                                   const u8 *meshda, const u8 *meshsa)
 875 {
 876         if (is_multicast_ether_addr(meshda)) {
 877                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 878                 /* DA TA SA */
 879                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 880                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 881                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 882                 return 24;
 883         } else {
 884                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 885                 /* RA TA DA SA */
 886                 eth_zero_addr(hdr->addr1);   /* RA is resolved later */
 887                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 888                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 889                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 890                 return 30;
 891         }
 892 }
 893
 894 /**
 895  * ieee80211_new_mesh_header - create a new mesh header
 896  * @sdata:      mesh interface to be used
 897  * @meshhdr:    uninitialized mesh header
 898  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 899  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 900  *              be NULL.
 901  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 902  *              mesh frame
 903  *
 904  * Returns: the header length
 905  */
 906 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 907                                        struct ieee80211s_hdr *meshhdr,
 908                                        const char *addr4or5, const char *addr6)
 909 {
 910         if (WARN_ON(!addr4or5 && addr6))
 911                 return 0;
 912
 913         memset(meshhdr, 0, sizeof(*meshhdr));
 914
 915         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 916
 917         put_unaligned_le32(atomic_inc_return(&sdata->u.mesh.mesh_seqnum),
 918                            &meshhdr->seqnum);
 919         if (addr4or5 && !addr6) {
 920                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 921                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 922                 return 2 * ETH_ALEN;
 923         } else if (addr4or5 && addr6) {
 924                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 925                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 926                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 927                 return 3 * ETH_ALEN;
 928         }
 929
 930         return ETH_ALEN;
 931 }
 932
 933 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 934 {
 935         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 936         u64 changed;
 937
 938         if (ifmsh->mshcfg.plink_timeout > 0)
 939                 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
 940         mesh_path_expire(sdata);
 941
 942         changed = mesh_accept_plinks_update(sdata);
 943         ieee80211_mbss_info_change_notify(sdata, changed);
 944
 945         mesh_fast_tx_gc(sdata);
 946
 947         mod_timer(&ifmsh->housekeeping_timer,
 948                   round_jiffies(jiffies +
 949                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 950 }
 951
 952 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 953 {
 954         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 955         u32 interval;
 956
 957         mesh_path_tx_root_frame(sdata);
 958
 959         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 960                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 961         else
 962                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 963
 964         mod_timer(&ifmsh->mesh_path_root_timer,
 965                   round_jiffies(TU_TO_EXP_TIME(interval)));
 966 }
 967
 968 static int
 969 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 970 {
 971         struct beacon_data *bcn;
 972         int head_len, tail_len;
 973         struct sk_buff *skb;
 974         struct ieee80211_mgmt *mgmt;
 975         struct ieee80211_chanctx_conf *chanctx_conf;
 976         struct mesh_csa_settings *csa;
 977         enum nl80211_band band;
 978         u8 ie_len_he_cap, ie_len_eht_cap;
 979         u8 *pos;
 980         struct ieee80211_sub_if_data *sdata;
 981         int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
 982
 983         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 984         rcu_read_lock();
 985         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 986         band = chanctx_conf->def.chan->band;
 987         rcu_read_unlock();
 988
 989         ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
 990                                                 NL80211_IFTYPE_MESH_POINT);
 991         ie_len_eht_cap = ieee80211_ie_len_eht_cap(sdata,
 992                                                   NL80211_IFTYPE_MESH_POINT);
 993         head_len = hdr_len +
 994                    2 + /* NULL SSID */
 995                    /* Channel Switch Announcement */
 996                    2 + sizeof(struct ieee80211_channel_sw_ie) +
 997                    /* Mesh Channel Switch Parameters */
 998                    2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
 999                    /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
1000                    2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
1001                    2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1002                    2 + 8 + /* supported rates */
1003                    2 + 3; /* DS params */
1004         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1005                    2 + sizeof(struct ieee80211_ht_cap) +
1006                    2 + sizeof(struct ieee80211_ht_operation) +
1007                    2 + ifmsh->mesh_id_len +
1008                    2 + sizeof(struct ieee80211_meshconf_ie) +
1009                    2 + sizeof(__le16) + /* awake window */
1010                    2 + sizeof(struct ieee80211_vht_cap) +
1011                    2 + sizeof(struct ieee80211_vht_operation) +
1012                    ie_len_he_cap +
1013                    2 + 1 + sizeof(struct ieee80211_he_operation) +
1014                            sizeof(struct ieee80211_he_6ghz_oper) +
1015                    2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
1016                    ie_len_eht_cap +
1017                    2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
1018                            offsetof(struct ieee80211_eht_operation_info, optional) +
1019                    ifmsh->ie_len;
1020
1021         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
1022         /* need an skb for IE builders to operate on */
1023         skb = __dev_alloc_skb(max(head_len, tail_len), GFP_KERNEL);
1024
1025         if (!bcn || !skb)
1026                 goto out_free;
1027
1028         /*
1029          * pointers go into the block we allocated,
1030          * memory is | beacon_data | head | tail |
1031          */
1032         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
1033
1034         /* fill in the head */
1035         mgmt = skb_put_zero(skb, hdr_len);
1036         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1037                                           IEEE80211_STYPE_BEACON);
1038         eth_broadcast_addr(mgmt->da);
1039         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1040         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
1041         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
1042         mgmt->u.beacon.beacon_int =
1043                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
1044         mgmt->u.beacon.capab_info |= cpu_to_le16(
1045                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
1046
1047         pos = skb_put(skb, 2);
1048         *pos++ = WLAN_EID_SSID;
1049         *pos++ = 0x0;
1050
1051         rcu_read_lock();
1052         csa = rcu_dereference(ifmsh->csa);
1053         if (csa) {
1054                 enum nl80211_channel_type ct;
1055                 struct cfg80211_chan_def *chandef;
1056                 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
1057                              2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
1058
1059                 pos = skb_put_zero(skb, ie_len);
1060                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
1061                 *pos++ = 3;
1062                 *pos++ = 0x0;
1063                 *pos++ = ieee80211_frequency_to_channel(
1064                                 csa->settings.chandef.chan->center_freq);
1065                 bcn->cntdwn_current_counter = csa->settings.count;
1066                 bcn->cntdwn_counter_offsets[0] = hdr_len + 6;
1067                 *pos++ = csa->settings.count;
1068                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
1069                 *pos++ = 6;
1070                 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
1071                         *pos++ = ifmsh->mshcfg.dot11MeshTTL;
1072                         *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1073                 } else {
1074                         *pos++ = ifmsh->chsw_ttl;
1075                 }
1076                 *pos++ |= csa->settings.block_tx ?
1077                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
1078                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
1079                 pos += 2;
1080                 put_unaligned_le16(ifmsh->pre_value, pos);
1081                 pos += 2;
1082
1083                 switch (csa->settings.chandef.width) {
1084                 case NL80211_CHAN_WIDTH_40:
1085                         ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1086                         pos = skb_put_zero(skb, ie_len);
1087
1088                         *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
1089                         *pos++ = 1;                                 /* len */
1090                         ct = cfg80211_get_chandef_type(&csa->settings.chandef);
1091                         if (ct == NL80211_CHAN_HT40PLUS)
1092                                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1093                         else
1094                                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1095                         break;
1096                 case NL80211_CHAN_WIDTH_80:
1097                 case NL80211_CHAN_WIDTH_80P80:
1098                 case NL80211_CHAN_WIDTH_160:
1099                         /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
1100                         ie_len = 2 + 2 +
1101                                  sizeof(struct ieee80211_wide_bw_chansw_ie);
1102                         pos = skb_put_zero(skb, ie_len);
1103
1104                         *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
1105                         *pos++ = 5;                               /* len */
1106                         /* put sub IE */
1107                         chandef = &csa->settings.chandef;
1108                         ieee80211_ie_build_wide_bw_cs(pos, chandef);
1109                         break;
1110                 default:
1111                         break;
1112                 }
1113         }
1114         rcu_read_unlock();
1115
1116         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
1117             mesh_add_ds_params_ie(sdata, skb))
1118                 goto out_free;
1119
1120         bcn->head_len = skb->len;
1121         memcpy(bcn->head, skb->data, bcn->head_len);
1122
1123         /* now the tail */
1124         skb_trim(skb, 0);
1125         bcn->tail = bcn->head + bcn->head_len;
1126
1127         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
1128             mesh_add_rsn_ie(sdata, skb) ||
1129             mesh_add_ht_cap_ie(sdata, skb) ||
1130             mesh_add_ht_oper_ie(sdata, skb) ||
1131             mesh_add_meshid_ie(sdata, skb) ||
1132             mesh_add_meshconf_ie(sdata, skb) ||
1133             mesh_add_awake_window_ie(sdata, skb) ||
1134             mesh_add_vht_cap_ie(sdata, skb) ||
1135             mesh_add_vht_oper_ie(sdata, skb) ||
1136             mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
1137             mesh_add_he_oper_ie(sdata, skb) ||
1138             mesh_add_he_6ghz_cap_ie(sdata, skb) ||
1139             mesh_add_eht_cap_ie(sdata, skb, ie_len_eht_cap) ||
1140             mesh_add_eht_oper_ie(sdata, skb) ||
1141             mesh_add_vendor_ies(sdata, skb))
1142                 goto out_free;
1143
1144         bcn->tail_len = skb->len;
1145         memcpy(bcn->tail, skb->data, bcn->tail_len);
1146         ieee80211_mesh_update_bss_params(sdata, bcn->tail, bcn->tail_len);
1147         bcn->meshconf = (struct ieee80211_meshconf_ie *)
1148                                         (bcn->tail + ifmsh->meshconf_offset);
1149
1150         dev_kfree_skb(skb);
1151         rcu_assign_pointer(ifmsh->beacon, bcn);
1152         return 0;
1153 out_free:
1154         kfree(bcn);
1155         dev_kfree_skb(skb);
1156         return -ENOMEM;
1157 }
1158
1159 static int
1160 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
1161 {
1162         struct beacon_data *old_bcn;
1163         int ret;
1164
1165         old_bcn = sdata_dereference(sdata->u.mesh.beacon, sdata);
1166         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
1167         if (ret)
1168                 /* just reuse old beacon */
1169                 return ret;
1170
1171         if (old_bcn)
1172                 kfree_rcu(old_bcn, rcu_head);
1173         return 0;
1174 }
1175
1176 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1177                                        u64 changed)
1178 {
1179         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1180         unsigned long bits = changed;
1181         u32 bit;
1182
1183         if (!bits)
1184                 return;
1185
1186         /* if we race with running work, worst case this work becomes a noop */
1187         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
1188                 set_bit(bit, ifmsh->mbss_changed);
1189         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
1190         wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1191 }
1192
1193 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
1194 {
1195         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1196         struct ieee80211_local *local = sdata->local;
1197         u64 changed = BSS_CHANGED_BEACON |
1198                       BSS_CHANGED_BEACON_ENABLED |
1199                       BSS_CHANGED_HT |
1200                       BSS_CHANGED_BASIC_RATES |
1201                       BSS_CHANGED_BEACON_INT |
1202                       BSS_CHANGED_MCAST_RATE;
1203
1204         local->fif_other_bss++;
1205         /* mesh ifaces must set allmulti to forward mcast traffic */
1206         atomic_inc(&local->iff_allmultis);
1207         ieee80211_configure_filter(local);
1208
1209         ifmsh->mesh_cc_id = 0;  /* Disabled */
1210         /* register sync ops from extensible synchronization framework */
1211         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
1212         ifmsh->sync_offset_clockdrift_max = 0;
1213         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
1214         ieee80211_mesh_root_setup(ifmsh);
1215         wiphy_work_queue(local->hw.wiphy, &sdata->work);
1216         sdata->vif.bss_conf.ht_operation_mode =
1217                                 ifmsh->mshcfg.ht_opmode;
1218         sdata->vif.bss_conf.enable_beacon = true;
1219
1220         changed |= ieee80211_mps_local_status_update(sdata);
1221
1222         if (ieee80211_mesh_build_beacon(ifmsh)) {
1223                 ieee80211_stop_mesh(sdata);
1224                 return -ENOMEM;
1225         }
1226
1227         ieee80211_recalc_dtim(local, sdata);
1228         ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1229
1230         netif_carrier_on(sdata->dev);
1231         return 0;
1232 }
1233
1234 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
1235 {
1236         struct ieee80211_local *local = sdata->local;
1237         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1238         struct beacon_data *bcn;
1239
1240         netif_carrier_off(sdata->dev);
1241
1242         /* flush STAs and mpaths on this iface */
1243         sta_info_flush(sdata);
1244         ieee80211_free_keys(sdata, true);
1245         mesh_path_flush_by_iface(sdata);
1246
1247         /* stop the beacon */
1248         ifmsh->mesh_id_len = 0;
1249         sdata->vif.bss_conf.enable_beacon = false;
1250         sdata->beacon_rate_set = false;
1251         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1252         ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1253                                           BSS_CHANGED_BEACON_ENABLED);
1254
1255         /* remove beacon */
1256         bcn = sdata_dereference(ifmsh->beacon, sdata);
1257         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1258         kfree_rcu(bcn, rcu_head);
1259
1260         /* free all potentially still buffered group-addressed frames */
1261         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1262         skb_queue_purge(&ifmsh->ps.bc_buf);
1263
1264         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
1265         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
1266         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
1267
1268         /* clear any mesh work (for next join) we may have accrued */
1269         ifmsh->wrkq_flags = 0;
1270         memset(ifmsh->mbss_changed, 0, sizeof(ifmsh->mbss_changed));
1271
1272         local->fif_other_bss--;
1273         atomic_dec(&local->iff_allmultis);
1274         ieee80211_configure_filter(local);
1275 }
1276
1277 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1278 {
1279         int err;
1280
1281         /* if the current channel is a DFS channel, mark the channel as
1282          * unavailable.
1283          */
1284         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1285                                             &sdata->vif.bss_conf.chandef,
1286                                             NL80211_IFTYPE_MESH_POINT);
1287         if (err > 0)
1288                 cfg80211_radar_event(sdata->local->hw.wiphy,
1289                                      &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
1290 }
1291
1292 static bool
1293 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1294                                  struct ieee802_11_elems *elems, bool beacon)
1295 {
1296         struct cfg80211_csa_settings params;
1297         struct ieee80211_csa_ie csa_ie;
1298         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1299         struct ieee80211_supported_band *sband;
1300         int err;
1301         ieee80211_conn_flags_t conn_flags = 0;
1302         u32 vht_cap_info = 0;
1303
1304         lockdep_assert_wiphy(sdata->local->hw.wiphy);
1305
1306         sband = ieee80211_get_sband(sdata);
1307         if (!sband)
1308                 return false;
1309
1310         switch (sdata->vif.bss_conf.chandef.width) {
1311         case NL80211_CHAN_WIDTH_20_NOHT:
1312                 conn_flags |= IEEE80211_CONN_DISABLE_HT;
1313                 fallthrough;
1314         case NL80211_CHAN_WIDTH_20:
1315                 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ;
1316                 fallthrough;
1317         case NL80211_CHAN_WIDTH_40:
1318                 conn_flags |= IEEE80211_CONN_DISABLE_VHT;
1319                 break;
1320         default:
1321                 break;
1322         }
1323
1324         if (elems->vht_cap_elem)
1325                 vht_cap_info =
1326                         le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1327
1328         memset(&params, 0, sizeof(params));
1329         err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1330                                            vht_cap_info,
1331                                            conn_flags, sdata->vif.addr,
1332                                            &csa_ie);
1333         if (err < 0)
1334                 return false;
1335         if (err)
1336                 return false;
1337
1338         /* Mark the channel unavailable if the reason for the switch is
1339          * regulatory.
1340          */
1341         if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1342                 ieee80211_mesh_csa_mark_radar(sdata);
1343
1344         params.chandef = csa_ie.chandef;
1345         params.count = csa_ie.count;
1346
1347         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
1348                                      IEEE80211_CHAN_DISABLED) ||
1349             !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
1350                                      NL80211_IFTYPE_MESH_POINT)) {
1351                 sdata_info(sdata,
1352                            "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1353                            sdata->vif.addr,
1354                            params.chandef.chan->center_freq,
1355                            params.chandef.width,
1356                            params.chandef.center_freq1,
1357                            params.chandef.center_freq2);
1358                 return false;
1359         }
1360
1361         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1362                                             &params.chandef,
1363                                             NL80211_IFTYPE_MESH_POINT);
1364         if (err < 0)
1365                 return false;
1366         if (err > 0 && !ifmsh->userspace_handles_dfs) {
1367                 sdata_info(sdata,
1368                            "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1369                            sdata->vif.addr,
1370                            params.chandef.chan->center_freq,
1371                            params.chandef.width,
1372                            params.chandef.center_freq1,
1373                            params.chandef.center_freq2);
1374                 return false;
1375         }
1376
1377         params.radar_required = err;
1378
1379         if (cfg80211_chandef_identical(&params.chandef,
1380                                        &sdata->vif.bss_conf.chandef)) {
1381                 mcsa_dbg(sdata,
1382                          "received csa with an identical chandef, ignoring\n");
1383                 return true;
1384         }
1385
1386         mcsa_dbg(sdata,
1387                  "received channel switch announcement to go to channel %d MHz\n",
1388                  params.chandef.chan->center_freq);
1389
1390         params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1391         if (beacon) {
1392                 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1393                 if (ifmsh->pre_value >= csa_ie.pre_value)
1394                         return false;
1395                 ifmsh->pre_value = csa_ie.pre_value;
1396         }
1397
1398         if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1399                 return false;
1400
1401         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1402
1403         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1404                                      &params) < 0)
1405                 return false;
1406
1407         return true;
1408 }
1409
1410 static void
1411 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1412                             struct ieee80211_mgmt *mgmt, size_t len)
1413 {
1414         struct ieee80211_local *local = sdata->local;
1415         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1416         struct sk_buff *presp;
1417         struct beacon_data *bcn;
1418         struct ieee80211_mgmt *hdr;
1419         struct ieee802_11_elems *elems;
1420         size_t baselen;
1421         u8 *pos;
1422
1423         pos = mgmt->u.probe_req.variable;
1424         baselen = (u8 *) pos - (u8 *) mgmt;
1425         if (baselen > len)
1426                 return;
1427
1428         elems = ieee802_11_parse_elems(pos, len - baselen, false, NULL);
1429         if (!elems)
1430                 return;
1431
1432         if (!elems->mesh_id)
1433                 goto free;
1434
1435         /* 802.11-2012 10.1.4.3.2 */
1436         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1437              !is_broadcast_ether_addr(mgmt->da)) ||
1438             elems->ssid_len != 0)
1439                 goto free;
1440
1441         if (elems->mesh_id_len != 0 &&
1442             (elems->mesh_id_len != ifmsh->mesh_id_len ||
1443              memcmp(elems->mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1444                 goto free;
1445
1446         rcu_read_lock();
1447         bcn = rcu_dereference(ifmsh->beacon);
1448
1449         if (!bcn)
1450                 goto out;
1451
1452         presp = dev_alloc_skb(local->tx_headroom +
1453                               bcn->head_len + bcn->tail_len);
1454         if (!presp)
1455                 goto out;
1456
1457         skb_reserve(presp, local->tx_headroom);
1458         skb_put_data(presp, bcn->head, bcn->head_len);
1459         skb_put_data(presp, bcn->tail, bcn->tail_len);
1460         hdr = (struct ieee80211_mgmt *) presp->data;
1461         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1462                                          IEEE80211_STYPE_PROBE_RESP);
1463         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1464         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1465         ieee80211_tx_skb(sdata, presp);
1466 out:
1467         rcu_read_unlock();
1468 free:
1469         kfree(elems);
1470 }
1471
1472 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1473                                         u16 stype,
1474                                         struct ieee80211_mgmt *mgmt,
1475                                         size_t len,
1476                                         struct ieee80211_rx_status *rx_status)
1477 {
1478         struct ieee80211_local *local = sdata->local;
1479         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1480         struct ieee802_11_elems *elems;
1481         struct ieee80211_channel *channel;
1482         size_t baselen;
1483         int freq;
1484         enum nl80211_band band = rx_status->band;
1485
1486         /* ignore ProbeResp to foreign address */
1487         if (stype == IEEE80211_STYPE_PROBE_RESP &&
1488             !ether_addr_equal(mgmt->da, sdata->vif.addr))
1489                 return;
1490
1491         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1492         if (baselen > len)
1493                 return;
1494
1495         elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1496                                        len - baselen,
1497                                        false, NULL);
1498         if (!elems)
1499                 return;
1500
1501         /* ignore non-mesh or secure / unsecure mismatch */
1502         if ((!elems->mesh_id || !elems->mesh_config) ||
1503             (elems->rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1504             (!elems->rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1505                 goto free;
1506
1507         if (elems->ds_params)
1508                 freq = ieee80211_channel_to_frequency(elems->ds_params[0], band);
1509         else
1510                 freq = rx_status->freq;
1511
1512         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1513
1514         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1515                 goto free;
1516
1517         if (mesh_matches_local(sdata, elems)) {
1518                 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1519                         sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1520                 if (!sdata->u.mesh.user_mpm ||
1521                     sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1522                     sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1523                         mesh_neighbour_update(sdata, mgmt->sa, elems,
1524                                               rx_status);
1525
1526                 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1527                     !sdata->vif.bss_conf.csa_active)
1528                         ieee80211_mesh_process_chnswitch(sdata, elems, true);
1529         }
1530
1531         if (ifmsh->sync_ops)
1532                 ifmsh->sync_ops->rx_bcn_presp(sdata, stype, mgmt, len,
1533                                               elems->mesh_config, rx_status);
1534 free:
1535         kfree(elems);
1536 }
1537
1538 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed)
1539 {
1540         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1541         struct mesh_csa_settings *tmp_csa_settings;
1542         int ret = 0;
1543
1544         /* Reset the TTL value and Initiator flag */
1545         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1546         ifmsh->chsw_ttl = 0;
1547
1548         /* Remove the CSA and MCSP elements from the beacon */
1549         tmp_csa_settings = sdata_dereference(ifmsh->csa, sdata);
1550         RCU_INIT_POINTER(ifmsh->csa, NULL);
1551         if (tmp_csa_settings)
1552                 kfree_rcu(tmp_csa_settings, rcu_head);
1553         ret = ieee80211_mesh_rebuild_beacon(sdata);
1554         if (ret)
1555                 return -EINVAL;
1556
1557         *changed |= BSS_CHANGED_BEACON;
1558
1559         mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1560                  sdata->vif.bss_conf.chandef.chan->center_freq);
1561         return 0;
1562 }
1563
1564 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1565                               struct cfg80211_csa_settings *csa_settings,
1566                               u64 *changed)
1567 {
1568         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1569         struct mesh_csa_settings *tmp_csa_settings;
1570         int ret = 0;
1571
1572         lockdep_assert_wiphy(sdata->local->hw.wiphy);
1573
1574         tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1575                                    GFP_ATOMIC);
1576         if (!tmp_csa_settings)
1577                 return -ENOMEM;
1578
1579         memcpy(&tmp_csa_settings->settings, csa_settings,
1580                sizeof(struct cfg80211_csa_settings));
1581
1582         rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1583
1584         ret = ieee80211_mesh_rebuild_beacon(sdata);
1585         if (ret) {
1586                 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1587                 RCU_INIT_POINTER(ifmsh->csa, NULL);
1588                 kfree_rcu(tmp_csa_settings, rcu_head);
1589                 return ret;
1590         }
1591
1592         *changed |= BSS_CHANGED_BEACON;
1593         return 0;
1594 }
1595
1596 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1597                                struct ieee80211_mgmt *mgmt, size_t len,
1598                                struct ieee802_11_elems *elems)
1599 {
1600         struct ieee80211_mgmt *mgmt_fwd;
1601         struct sk_buff *skb;
1602         struct ieee80211_local *local = sdata->local;
1603
1604         skb = dev_alloc_skb(local->tx_headroom + len);
1605         if (!skb)
1606                 return -ENOMEM;
1607         skb_reserve(skb, local->tx_headroom);
1608         mgmt_fwd = skb_put(skb, len);
1609
1610         elems->mesh_chansw_params_ie->mesh_ttl--;
1611         elems->mesh_chansw_params_ie->mesh_flags &=
1612                 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1613
1614         memcpy(mgmt_fwd, mgmt, len);
1615         eth_broadcast_addr(mgmt_fwd->da);
1616         memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1617         memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1618
1619         ieee80211_tx_skb(sdata, skb);
1620         return 0;
1621 }
1622
1623 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1624                               struct ieee80211_mgmt *mgmt, size_t len)
1625 {
1626         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1627         struct ieee802_11_elems *elems;
1628         u16 pre_value;
1629         bool fwd_csa = true;
1630         size_t baselen;
1631         u8 *pos;
1632
1633         if (mgmt->u.action.u.measurement.action_code !=
1634             WLAN_ACTION_SPCT_CHL_SWITCH)
1635                 return;
1636
1637         pos = mgmt->u.action.u.chan_switch.variable;
1638         baselen = offsetof(struct ieee80211_mgmt,
1639                            u.action.u.chan_switch.variable);
1640         elems = ieee802_11_parse_elems(pos, len - baselen, true, NULL);
1641         if (!elems)
1642                 return;
1643
1644         if (!mesh_matches_local(sdata, elems))
1645                 goto free;
1646
1647         ifmsh->chsw_ttl = elems->mesh_chansw_params_ie->mesh_ttl;
1648         if (!--ifmsh->chsw_ttl)
1649                 fwd_csa = false;
1650
1651         pre_value = le16_to_cpu(elems->mesh_chansw_params_ie->mesh_pre_value);
1652         if (ifmsh->pre_value >= pre_value)
1653                 goto free;
1654
1655         ifmsh->pre_value = pre_value;
1656
1657         if (!sdata->vif.bss_conf.csa_active &&
1658             !ieee80211_mesh_process_chnswitch(sdata, elems, false)) {
1659                 mcsa_dbg(sdata, "Failed to process CSA action frame");
1660                 goto free;
1661         }
1662
1663         /* forward or re-broadcast the CSA frame */
1664         if (fwd_csa) {
1665                 if (mesh_fwd_csa_frame(sdata, mgmt, len, elems) < 0)
1666                         mcsa_dbg(sdata, "Failed to forward the CSA frame");
1667         }
1668 free:
1669         kfree(elems);
1670 }
1671
1672 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1673                                           struct ieee80211_mgmt *mgmt,
1674                                           size_t len,
1675                                           struct ieee80211_rx_status *rx_status)
1676 {
1677         switch (mgmt->u.action.category) {
1678         case WLAN_CATEGORY_SELF_PROTECTED:
1679                 switch (mgmt->u.action.u.self_prot.action_code) {
1680                 case WLAN_SP_MESH_PEERING_OPEN:
1681                 case WLAN_SP_MESH_PEERING_CLOSE:
1682                 case WLAN_SP_MESH_PEERING_CONFIRM:
1683                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1684                         break;
1685                 }
1686                 break;
1687         case WLAN_CATEGORY_MESH_ACTION:
1688                 if (mesh_action_is_path_sel(mgmt))
1689                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1690                 break;
1691         case WLAN_CATEGORY_SPECTRUM_MGMT:
1692                 mesh_rx_csa_frame(sdata, mgmt, len);
1693                 break;
1694         }
1695 }
1696
1697 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1698                                    struct sk_buff *skb)
1699 {
1700         struct ieee80211_rx_status *rx_status;
1701         struct ieee80211_mgmt *mgmt;
1702         u16 stype;
1703
1704         lockdep_assert_wiphy(sdata->local->hw.wiphy);
1705
1706         /* mesh already went down */
1707         if (!sdata->u.mesh.mesh_id_len)
1708                 return;
1709
1710         rx_status = IEEE80211_SKB_RXCB(skb);
1711         mgmt = (struct ieee80211_mgmt *) skb->data;
1712         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1713
1714         switch (stype) {
1715         case IEEE80211_STYPE_PROBE_RESP:
1716         case IEEE80211_STYPE_BEACON:
1717                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1718                                             rx_status);
1719                 break;
1720         case IEEE80211_STYPE_PROBE_REQ:
1721                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1722                 break;
1723         case IEEE80211_STYPE_ACTION:
1724                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1725                 break;
1726         }
1727 }
1728
1729 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1730 {
1731         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1732         u32 bit;
1733         u64 changed = 0;
1734
1735         for_each_set_bit(bit, ifmsh->mbss_changed,
1736                          sizeof(changed) * BITS_PER_BYTE) {
1737                 clear_bit(bit, ifmsh->mbss_changed);
1738                 changed |= BIT(bit);
1739         }
1740
1741         if (sdata->vif.bss_conf.enable_beacon &&
1742             (changed & (BSS_CHANGED_BEACON |
1743                         BSS_CHANGED_HT |
1744                         BSS_CHANGED_BASIC_RATES |
1745                         BSS_CHANGED_BEACON_INT)))
1746                 if (ieee80211_mesh_rebuild_beacon(sdata))
1747                         return;
1748
1749         ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1750 }
1751
1752 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1753 {
1754         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1755
1756         lockdep_assert_wiphy(sdata->local->hw.wiphy);
1757
1758         /* mesh already went down */
1759         if (!sdata->u.mesh.mesh_id_len)
1760                 return;
1761
1762         if (ifmsh->preq_queue_len &&
1763             time_after(jiffies,
1764                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1765                 mesh_path_start_discovery(sdata);
1766
1767         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1768                 ieee80211_mesh_housekeeping(sdata);
1769
1770         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1771                 ieee80211_mesh_rootpath(sdata);
1772
1773         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1774                 mesh_sync_adjust_tsf(sdata);
1775
1776         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1777                 mesh_bss_info_changed(sdata);
1778 }
1779
1780
1781 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1782 {
1783         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1784         static u8 zero_addr[ETH_ALEN] = {};
1785
1786         timer_setup(&ifmsh->housekeeping_timer,
1787                     ieee80211_mesh_housekeeping_timer, 0);
1788
1789         ifmsh->accepting_plinks = true;
1790         atomic_set(&ifmsh->mpaths, 0);
1791         mesh_rmc_init(sdata);
1792         ifmsh->last_preq = jiffies;
1793         ifmsh->next_perr = jiffies;
1794         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1795         /* Allocate all mesh structures when creating the first mesh interface. */
1796         if (!mesh_allocated)
1797                 ieee80211s_init();
1798
1799         mesh_pathtbl_init(sdata);
1800
1801         timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1802         timer_setup(&ifmsh->mesh_path_root_timer,
1803                     ieee80211_mesh_path_root_timer, 0);
1804         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1805         skb_queue_head_init(&ifmsh->ps.bc_buf);
1806         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1807         spin_lock_init(&ifmsh->sync_offset_lock);
1808         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1809
1810         sdata->vif.bss_conf.bssid = zero_addr;
1811 }
1812
1813 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1814 {
1815         mesh_rmc_free(sdata);
1816         mesh_pathtbl_unregister(sdata);
1817 }