net/mac80211/mesh.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2008, 2009 open80211s Ltd.
   4  * Copyright (C) 2018 - 2019 Intel Corporation
   5  * Authors:    Luis Carlos Cobo <[email protected]>
   6  *             Javier Cardona <[email protected]>
   7  */
   8
   9 #include <linux/slab.h>
  10 #include <asm/unaligned.h>
  11 #include "ieee80211_i.h"
  12 #include "mesh.h"
  13 #include "driver-ops.h"
  14
  15 static int mesh_allocated;
  16 static struct kmem_cache *rm_cache;
  17
  18 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  19 {
  20         return (mgmt->u.action.u.mesh_action.action_code ==
  21                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
  22 }
  23
  24 void ieee80211s_init(void)
  25 {
  26         mesh_allocated = 1;
  27         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  28                                      0, 0, NULL);
  29 }
  30
  31 void ieee80211s_stop(void)
  32 {
  33         if (!mesh_allocated)
  34                 return;
  35         kmem_cache_destroy(rm_cache);
  36 }
  37
  38 static void ieee80211_mesh_housekeeping_timer(struct timer_list *t)
  39 {
  40         struct ieee80211_sub_if_data *sdata =
  41                 from_timer(sdata, t, u.mesh.housekeeping_timer);
  42         struct ieee80211_local *local = sdata->local;
  43         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  44
  45         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  46
  47         ieee80211_queue_work(&local->hw, &sdata->work);
  48 }
  49
  50 /**
  51  * mesh_matches_local - check if the config of a mesh point matches ours
  52  *
  53  * @sdata: local mesh subif
  54  * @ie: information elements of a management frame from the mesh peer
  55  *
  56  * This function checks if the mesh configuration of a mesh point matches the
  57  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  58  */
  59 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
  60                         struct ieee802_11_elems *ie)
  61 {
  62         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  63         u32 basic_rates = 0;
  64         struct cfg80211_chan_def sta_chan_def;
  65         struct ieee80211_supported_band *sband;
  66
  67         /*
  68          * As support for each feature is added, check for matching
  69          * - On mesh config capabilities
  70          *   - Power Save Support En
  71          *   - Sync support enabled
  72          *   - Sync support active
  73          *   - Sync support required from peer
  74          *   - MDA enabled
  75          * - Power management control on fc
  76          */
  77         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
  78              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  79              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  80              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  81              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  82              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  83              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  84                 return false;
  85
  86         sband = ieee80211_get_sband(sdata);
  87         if (!sband)
  88                 return false;
  89
  90         ieee80211_sta_get_rates(sdata, ie, sband->band,
  91                                 &basic_rates);
  92
  93         if (sdata->vif.bss_conf.basic_rates != basic_rates)
  94                 return false;
  95
  96         cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
  97                                 NL80211_CHAN_NO_HT);
  98         ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
  99         ieee80211_chandef_vht_oper(&sdata->local->hw,
 100                                    ie->vht_operation, ie->ht_operation,
 101                                    &sta_chan_def);
 102
 103         if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
 104                                          &sta_chan_def))
 105                 return false;
 106
 107         return true;
 108 }
 109
 110 /**
 111  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 112  *
 113  * @ie: information elements of a management frame from the mesh peer
 114  */
 115 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 116 {
 117         return (ie->mesh_config->meshconf_cap &
 118                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 119 }
 120
 121 /**
 122  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
 123  *
 124  * @sdata: mesh interface in which mesh beacons are going to be updated
 125  *
 126  * Returns: beacon changed flag if the beacon content changed.
 127  */
 128 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 129 {
 130         bool free_plinks;
 131         u32 changed = 0;
 132
 133         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 134          * the mesh interface might be able to establish plinks with peers that
 135          * are already on the table but are not on PLINK_ESTAB state. However,
 136          * in general the mesh interface is not accepting peer link requests
 137          * from new peers, and that must be reflected in the beacon
 138          */
 139         free_plinks = mesh_plink_availables(sdata);
 140
 141         if (free_plinks != sdata->u.mesh.accepting_plinks) {
 142                 sdata->u.mesh.accepting_plinks = free_plinks;
 143                 changed = BSS_CHANGED_BEACON;
 144         }
 145
 146         return changed;
 147 }
 148
 149 /*
 150  * mesh_sta_cleanup - clean up any mesh sta state
 151  *
 152  * @sta: mesh sta to clean up.
 153  */
 154 void mesh_sta_cleanup(struct sta_info *sta)
 155 {
 156         struct ieee80211_sub_if_data *sdata = sta->sdata;
 157         u32 changed = mesh_plink_deactivate(sta);
 158
 159         if (changed)
 160                 ieee80211_mbss_info_change_notify(sdata, changed);
 161 }
 162
 163 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 164 {
 165         int i;
 166
 167         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 168         if (!sdata->u.mesh.rmc)
 169                 return -ENOMEM;
 170         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 171         for (i = 0; i < RMC_BUCKETS; i++)
 172                 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
 173         return 0;
 174 }
 175
 176 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 177 {
 178         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 179         struct rmc_entry *p;
 180         struct hlist_node *n;
 181         int i;
 182
 183         if (!sdata->u.mesh.rmc)
 184                 return;
 185
 186         for (i = 0; i < RMC_BUCKETS; i++) {
 187                 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 188                         hlist_del(&p->list);
 189                         kmem_cache_free(rm_cache, p);
 190                 }
 191         }
 192
 193         kfree(rmc);
 194         sdata->u.mesh.rmc = NULL;
 195 }
 196
 197 /**
 198  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 199  *
 200  * @sdata:      interface
 201  * @sa:         source address
 202  * @mesh_hdr:   mesh_header
 203  *
 204  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 205  *
 206  * Checks using the source address and the mesh sequence number if we have
 207  * received this frame lately. If the frame is not in the cache, it is added to
 208  * it.
 209  */
 210 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
 211                    const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
 212 {
 213         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 214         u32 seqnum = 0;
 215         int entries = 0;
 216         u8 idx;
 217         struct rmc_entry *p;
 218         struct hlist_node *n;
 219
 220         if (!rmc)
 221                 return -1;
 222
 223         /* Don't care about endianness since only match matters */
 224         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 225         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 226         hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 227                 ++entries;
 228                 if (time_after(jiffies, p->exp_time) ||
 229                     entries == RMC_QUEUE_MAX_LEN) {
 230                         hlist_del(&p->list);
 231                         kmem_cache_free(rm_cache, p);
 232                         --entries;
 233                 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
 234                         return -1;
 235         }
 236
 237         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 238         if (!p)
 239                 return 0;
 240
 241         p->seqnum = seqnum;
 242         p->exp_time = jiffies + RMC_TIMEOUT;
 243         memcpy(p->sa, sa, ETH_ALEN);
 244         hlist_add_head(&p->list, &rmc->bucket[idx]);
 245         return 0;
 246 }
 247
 248 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
 249                          struct sk_buff *skb)
 250 {
 251         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 252         u8 *pos, neighbors;
 253         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 254         bool is_connected_to_gate = ifmsh->num_gates > 0 ||
 255                 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
 256                 ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
 257
 258         if (skb_tailroom(skb) < 2 + meshconf_len)
 259                 return -ENOMEM;
 260
 261         pos = skb_put(skb, 2 + meshconf_len);
 262         *pos++ = WLAN_EID_MESH_CONFIG;
 263         *pos++ = meshconf_len;
 264
 265         /* save a pointer for quick updates in pre-tbtt */
 266         ifmsh->meshconf_offset = pos - skb->data;
 267
 268         /* Active path selection protocol ID */
 269         *pos++ = ifmsh->mesh_pp_id;
 270         /* Active path selection metric ID   */
 271         *pos++ = ifmsh->mesh_pm_id;
 272         /* Congestion control mode identifier */
 273         *pos++ = ifmsh->mesh_cc_id;
 274         /* Synchronization protocol identifier */
 275         *pos++ = ifmsh->mesh_sp_id;
 276         /* Authentication Protocol identifier */
 277         *pos++ = ifmsh->mesh_auth_id;
 278         /* Mesh Formation Info - number of neighbors */
 279         neighbors = atomic_read(&ifmsh->estab_plinks);
 280         neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
 281         *pos++ = (neighbors << 1) | is_connected_to_gate;
 282         /* Mesh capability */
 283         *pos = 0x00;
 284         *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
 285                         IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
 286         *pos |= ifmsh->accepting_plinks ?
 287                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 288         /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
 289         *pos |= ifmsh->ps_peers_deep_sleep ?
 290                         IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
 291         return 0;
 292 }
 293
 294 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 295 {
 296         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 297         u8 *pos;
 298
 299         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 300                 return -ENOMEM;
 301
 302         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 303         *pos++ = WLAN_EID_MESH_ID;
 304         *pos++ = ifmsh->mesh_id_len;
 305         if (ifmsh->mesh_id_len)
 306                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 307
 308         return 0;
 309 }
 310
 311 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
 312                                     struct sk_buff *skb)
 313 {
 314         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 315         u8 *pos;
 316
 317         /* see IEEE802.11-2012 13.14.6 */
 318         if (ifmsh->ps_peers_light_sleep == 0 &&
 319             ifmsh->ps_peers_deep_sleep == 0 &&
 320             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
 321                 return 0;
 322
 323         if (skb_tailroom(skb) < 4)
 324                 return -ENOMEM;
 325
 326         pos = skb_put(skb, 2 + 2);
 327         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
 328         *pos++ = 2;
 329         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 330
 331         return 0;
 332 }
 333
 334 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 335                         struct sk_buff *skb)
 336 {
 337         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 338         u8 offset, len;
 339         const u8 *data;
 340
 341         if (!ifmsh->ie || !ifmsh->ie_len)
 342                 return 0;
 343
 344         /* fast-forward to vendor IEs */
 345         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 346
 347         if (offset < ifmsh->ie_len) {
 348                 len = ifmsh->ie_len - offset;
 349                 data = ifmsh->ie + offset;
 350                 if (skb_tailroom(skb) < len)
 351                         return -ENOMEM;
 352                 skb_put_data(skb, data, len);
 353         }
 354
 355         return 0;
 356 }
 357
 358 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 359 {
 360         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 361         u8 len = 0;
 362         const u8 *data;
 363
 364         if (!ifmsh->ie || !ifmsh->ie_len)
 365                 return 0;
 366
 367         /* find RSN IE */
 368         data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
 369         if (!data)
 370                 return 0;
 371
 372         len = data[1] + 2;
 373
 374         if (skb_tailroom(skb) < len)
 375                 return -ENOMEM;
 376         skb_put_data(skb, data, len);
 377
 378         return 0;
 379 }
 380
 381 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
 382                                  struct sk_buff *skb)
 383 {
 384         struct ieee80211_chanctx_conf *chanctx_conf;
 385         struct ieee80211_channel *chan;
 386         u8 *pos;
 387
 388         if (skb_tailroom(skb) < 3)
 389                 return -ENOMEM;
 390
 391         rcu_read_lock();
 392         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 393         if (WARN_ON(!chanctx_conf)) {
 394                 rcu_read_unlock();
 395                 return -EINVAL;
 396         }
 397         chan = chanctx_conf->def.chan;
 398         rcu_read_unlock();
 399
 400         pos = skb_put(skb, 2 + 1);
 401         *pos++ = WLAN_EID_DS_PARAMS;
 402         *pos++ = 1;
 403         *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 404
 405         return 0;
 406 }
 407
 408 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
 409                        struct sk_buff *skb)
 410 {
 411         struct ieee80211_supported_band *sband;
 412         u8 *pos;
 413
 414         sband = ieee80211_get_sband(sdata);
 415         if (!sband)
 416                 return -EINVAL;
 417
 418         if (!sband->ht_cap.ht_supported ||
 419             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 420             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 421             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 422                 return 0;
 423
 424         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 425                 return -ENOMEM;
 426
 427         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 428         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 429
 430         return 0;
 431 }
 432
 433 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
 434                         struct sk_buff *skb)
 435 {
 436         struct ieee80211_local *local = sdata->local;
 437         struct ieee80211_chanctx_conf *chanctx_conf;
 438         struct ieee80211_channel *channel;
 439         struct ieee80211_supported_band *sband;
 440         struct ieee80211_sta_ht_cap *ht_cap;
 441         u8 *pos;
 442
 443         rcu_read_lock();
 444         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 445         if (WARN_ON(!chanctx_conf)) {
 446                 rcu_read_unlock();
 447                 return -EINVAL;
 448         }
 449         channel = chanctx_conf->def.chan;
 450         rcu_read_unlock();
 451
 452         sband = local->hw.wiphy->bands[channel->band];
 453         ht_cap = &sband->ht_cap;
 454
 455         if (!ht_cap->ht_supported ||
 456             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 457             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 458             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 459                 return 0;
 460
 461         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 462                 return -ENOMEM;
 463
 464         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 465         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
 466                                    sdata->vif.bss_conf.ht_operation_mode,
 467                                    false);
 468
 469         return 0;
 470 }
 471
 472 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
 473                         struct sk_buff *skb)
 474 {
 475         struct ieee80211_supported_band *sband;
 476         u8 *pos;
 477
 478         sband = ieee80211_get_sband(sdata);
 479         if (!sband)
 480                 return -EINVAL;
 481
 482         if (!sband->vht_cap.vht_supported ||
 483             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 484             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 485             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 486                 return 0;
 487
 488         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
 489                 return -ENOMEM;
 490
 491         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
 492         ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
 493
 494         return 0;
 495 }
 496
 497 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
 498                          struct sk_buff *skb)
 499 {
 500         struct ieee80211_local *local = sdata->local;
 501         struct ieee80211_chanctx_conf *chanctx_conf;
 502         struct ieee80211_channel *channel;
 503         struct ieee80211_supported_band *sband;
 504         struct ieee80211_sta_vht_cap *vht_cap;
 505         u8 *pos;
 506
 507         rcu_read_lock();
 508         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 509         if (WARN_ON(!chanctx_conf)) {
 510                 rcu_read_unlock();
 511                 return -EINVAL;
 512         }
 513         channel = chanctx_conf->def.chan;
 514         rcu_read_unlock();
 515
 516         sband = local->hw.wiphy->bands[channel->band];
 517         vht_cap = &sband->vht_cap;
 518
 519         if (!vht_cap->vht_supported ||
 520             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 521             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 522             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 523                 return 0;
 524
 525         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
 526                 return -ENOMEM;
 527
 528         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 529         ieee80211_ie_build_vht_oper(pos, vht_cap,
 530                                     &sdata->vif.bss_conf.chandef);
 531
 532         return 0;
 533 }
 534
 535 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
 536                        struct sk_buff *skb, u8 ie_len)
 537 {
 538         const struct ieee80211_sta_he_cap *he_cap;
 539         struct ieee80211_supported_band *sband;
 540         u8 *pos;
 541
 542         sband = ieee80211_get_sband(sdata);
 543         if (!sband)
 544                 return -EINVAL;
 545
 546         he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 547
 548         if (!he_cap ||
 549             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 550             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 551             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 552                 return 0;
 553
 554         if (skb_tailroom(skb) < ie_len)
 555                 return -ENOMEM;
 556
 557         pos = skb_put(skb, ie_len);
 558         ieee80211_ie_build_he_cap(pos, he_cap, pos + ie_len);
 559
 560         return 0;
 561 }
 562
 563 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
 564                         struct sk_buff *skb)
 565 {
 566         const struct ieee80211_sta_he_cap *he_cap;
 567         struct ieee80211_supported_band *sband;
 568         u8 *pos;
 569
 570         sband = ieee80211_get_sband(sdata);
 571         if (!sband)
 572                 return -EINVAL;
 573
 574         he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 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) < 2 + 1 + sizeof(struct ieee80211_he_operation))
 582                 return -ENOMEM;
 583
 584         pos = skb_put(skb, 2 + 1 + sizeof(struct ieee80211_he_operation));
 585         ieee80211_ie_build_he_oper(pos);
 586
 587         return 0;
 588 }
 589
 590 static void ieee80211_mesh_path_timer(struct timer_list *t)
 591 {
 592         struct ieee80211_sub_if_data *sdata =
 593                 from_timer(sdata, t, u.mesh.mesh_path_timer);
 594
 595         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 596 }
 597
 598 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
 599 {
 600         struct ieee80211_sub_if_data *sdata =
 601                 from_timer(sdata, t, u.mesh.mesh_path_root_timer);
 602         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 603
 604         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 605
 606         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 607 }
 608
 609 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 610 {
 611         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 612                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 613         else {
 614                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 615                 /* stop running timer */
 616                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 617         }
 618 }
 619
 620 /**
 621  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 622  * @hdr:        802.11 frame header
 623  * @fc:         frame control field
 624  * @meshda:     destination address in the mesh
 625  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 626  *              locally originated.
 627  *
 628  * Return the length of the 802.11 (does not include a mesh control header)
 629  */
 630 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 631                                   const u8 *meshda, const u8 *meshsa)
 632 {
 633         if (is_multicast_ether_addr(meshda)) {
 634                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 635                 /* DA TA SA */
 636                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 637                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 638                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 639                 return 24;
 640         } else {
 641                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 642                 /* RA TA DA SA */
 643                 eth_zero_addr(hdr->addr1);   /* RA is resolved later */
 644                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 645                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 646                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 647                 return 30;
 648         }
 649 }
 650
 651 /**
 652  * ieee80211_new_mesh_header - create a new mesh header
 653  * @sdata:      mesh interface to be used
 654  * @meshhdr:    uninitialized mesh header
 655  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 656  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 657  *              be NULL.
 658  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 659  *              mesh frame
 660  *
 661  * Return the header length.
 662  */
 663 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 664                                        struct ieee80211s_hdr *meshhdr,
 665                                        const char *addr4or5, const char *addr6)
 666 {
 667         if (WARN_ON(!addr4or5 && addr6))
 668                 return 0;
 669
 670         memset(meshhdr, 0, sizeof(*meshhdr));
 671
 672         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 673
 674         /* FIXME: racy -- TX on multiple queues can be concurrent */
 675         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 676         sdata->u.mesh.mesh_seqnum++;
 677
 678         if (addr4or5 && !addr6) {
 679                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 680                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 681                 return 2 * ETH_ALEN;
 682         } else if (addr4or5 && addr6) {
 683                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 684                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 685                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 686                 return 3 * ETH_ALEN;
 687         }
 688
 689         return ETH_ALEN;
 690 }
 691
 692 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 693 {
 694         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 695         u32 changed;
 696
 697         if (ifmsh->mshcfg.plink_timeout > 0)
 698                 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
 699         mesh_path_expire(sdata);
 700
 701         changed = mesh_accept_plinks_update(sdata);
 702         ieee80211_mbss_info_change_notify(sdata, changed);
 703
 704         mod_timer(&ifmsh->housekeeping_timer,
 705                   round_jiffies(jiffies +
 706                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 707 }
 708
 709 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 710 {
 711         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 712         u32 interval;
 713
 714         mesh_path_tx_root_frame(sdata);
 715
 716         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 717                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 718         else
 719                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 720
 721         mod_timer(&ifmsh->mesh_path_root_timer,
 722                   round_jiffies(TU_TO_EXP_TIME(interval)));
 723 }
 724
 725 static int
 726 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 727 {
 728         struct beacon_data *bcn;
 729         int head_len, tail_len;
 730         struct sk_buff *skb;
 731         struct ieee80211_mgmt *mgmt;
 732         struct ieee80211_chanctx_conf *chanctx_conf;
 733         struct mesh_csa_settings *csa;
 734         enum nl80211_band band;
 735         u8 ie_len_he_cap;
 736         u8 *pos;
 737         struct ieee80211_sub_if_data *sdata;
 738         int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
 739
 740         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 741         rcu_read_lock();
 742         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 743         band = chanctx_conf->def.chan->band;
 744         rcu_read_unlock();
 745
 746         ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
 747                                                 NL80211_IFTYPE_MESH_POINT);
 748         head_len = hdr_len +
 749                    2 + /* NULL SSID */
 750                    /* Channel Switch Announcement */
 751                    2 + sizeof(struct ieee80211_channel_sw_ie) +
 752                    /* Mesh Channel Switch Parameters */
 753                    2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
 754                    /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
 755                    2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
 756                    2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
 757                    2 + 8 + /* supported rates */
 758                    2 + 3; /* DS params */
 759         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 760                    2 + sizeof(struct ieee80211_ht_cap) +
 761                    2 + sizeof(struct ieee80211_ht_operation) +
 762                    2 + ifmsh->mesh_id_len +
 763                    2 + sizeof(struct ieee80211_meshconf_ie) +
 764                    2 + sizeof(__le16) + /* awake window */
 765                    2 + sizeof(struct ieee80211_vht_cap) +
 766                    2 + sizeof(struct ieee80211_vht_operation) +
 767                    ie_len_he_cap +
 768                    2 + 1 + sizeof(struct ieee80211_he_operation) +
 769                    ifmsh->ie_len;
 770
 771         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
 772         /* need an skb for IE builders to operate on */
 773         skb = dev_alloc_skb(max(head_len, tail_len));
 774
 775         if (!bcn || !skb)
 776                 goto out_free;
 777
 778         /*
 779          * pointers go into the block we allocated,
 780          * memory is | beacon_data | head | tail |
 781          */
 782         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
 783
 784         /* fill in the head */
 785         mgmt = skb_put_zero(skb, hdr_len);
 786         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 787                                           IEEE80211_STYPE_BEACON);
 788         eth_broadcast_addr(mgmt->da);
 789         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 790         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 791         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
 792         mgmt->u.beacon.beacon_int =
 793                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
 794         mgmt->u.beacon.capab_info |= cpu_to_le16(
 795                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
 796
 797         pos = skb_put(skb, 2);
 798         *pos++ = WLAN_EID_SSID;
 799         *pos++ = 0x0;
 800
 801         rcu_read_lock();
 802         csa = rcu_dereference(ifmsh->csa);
 803         if (csa) {
 804                 enum nl80211_channel_type ct;
 805                 struct cfg80211_chan_def *chandef;
 806                 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
 807                              2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
 808
 809                 pos = skb_put_zero(skb, ie_len);
 810                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 811                 *pos++ = 3;
 812                 *pos++ = 0x0;
 813                 *pos++ = ieee80211_frequency_to_channel(
 814                                 csa->settings.chandef.chan->center_freq);
 815                 bcn->csa_current_counter = csa->settings.count;
 816                 bcn->csa_counter_offsets[0] = hdr_len + 6;
 817                 *pos++ = csa->settings.count;
 818                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
 819                 *pos++ = 6;
 820                 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
 821                         *pos++ = ifmsh->mshcfg.dot11MeshTTL;
 822                         *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
 823                 } else {
 824                         *pos++ = ifmsh->chsw_ttl;
 825                 }
 826                 *pos++ |= csa->settings.block_tx ?
 827                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
 828                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
 829                 pos += 2;
 830                 put_unaligned_le16(ifmsh->pre_value, pos);
 831                 pos += 2;
 832
 833                 switch (csa->settings.chandef.width) {
 834                 case NL80211_CHAN_WIDTH_40:
 835                         ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
 836                         pos = skb_put_zero(skb, ie_len);
 837
 838                         *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
 839                         *pos++ = 1;                                 /* len */
 840                         ct = cfg80211_get_chandef_type(&csa->settings.chandef);
 841                         if (ct == NL80211_CHAN_HT40PLUS)
 842                                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 843                         else
 844                                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 845                         break;
 846                 case NL80211_CHAN_WIDTH_80:
 847                 case NL80211_CHAN_WIDTH_80P80:
 848                 case NL80211_CHAN_WIDTH_160:
 849                         /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
 850                         ie_len = 2 + 2 +
 851                                  sizeof(struct ieee80211_wide_bw_chansw_ie);
 852                         pos = skb_put_zero(skb, ie_len);
 853
 854                         *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
 855                         *pos++ = 5;                               /* len */
 856                         /* put sub IE */
 857                         chandef = &csa->settings.chandef;
 858                         ieee80211_ie_build_wide_bw_cs(pos, chandef);
 859                         break;
 860                 default:
 861                         break;
 862                 }
 863         }
 864         rcu_read_unlock();
 865
 866         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
 867             mesh_add_ds_params_ie(sdata, skb))
 868                 goto out_free;
 869
 870         bcn->head_len = skb->len;
 871         memcpy(bcn->head, skb->data, bcn->head_len);
 872
 873         /* now the tail */
 874         skb_trim(skb, 0);
 875         bcn->tail = bcn->head + bcn->head_len;
 876
 877         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
 878             mesh_add_rsn_ie(sdata, skb) ||
 879             mesh_add_ht_cap_ie(sdata, skb) ||
 880             mesh_add_ht_oper_ie(sdata, skb) ||
 881             mesh_add_meshid_ie(sdata, skb) ||
 882             mesh_add_meshconf_ie(sdata, skb) ||
 883             mesh_add_awake_window_ie(sdata, skb) ||
 884             mesh_add_vht_cap_ie(sdata, skb) ||
 885             mesh_add_vht_oper_ie(sdata, skb) ||
 886             mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
 887             mesh_add_he_oper_ie(sdata, skb) ||
 888             mesh_add_vendor_ies(sdata, skb))
 889                 goto out_free;
 890
 891         bcn->tail_len = skb->len;
 892         memcpy(bcn->tail, skb->data, bcn->tail_len);
 893         bcn->meshconf = (struct ieee80211_meshconf_ie *)
 894                                         (bcn->tail + ifmsh->meshconf_offset);
 895
 896         dev_kfree_skb(skb);
 897         rcu_assign_pointer(ifmsh->beacon, bcn);
 898         return 0;
 899 out_free:
 900         kfree(bcn);
 901         dev_kfree_skb(skb);
 902         return -ENOMEM;
 903 }
 904
 905 static int
 906 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
 907 {
 908         struct beacon_data *old_bcn;
 909         int ret;
 910
 911         old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
 912                                             lockdep_is_held(&sdata->wdev.mtx));
 913         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
 914         if (ret)
 915                 /* just reuse old beacon */
 916                 return ret;
 917
 918         if (old_bcn)
 919                 kfree_rcu(old_bcn, rcu_head);
 920         return 0;
 921 }
 922
 923 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 924                                        u32 changed)
 925 {
 926         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 927         unsigned long bits = changed;
 928         u32 bit;
 929
 930         if (!bits)
 931                 return;
 932
 933         /* if we race with running work, worst case this work becomes a noop */
 934         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
 935                 set_bit(bit, &ifmsh->mbss_changed);
 936         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
 937         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 938 }
 939
 940 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 941 {
 942         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 943         struct ieee80211_local *local = sdata->local;
 944         u32 changed = BSS_CHANGED_BEACON |
 945                       BSS_CHANGED_BEACON_ENABLED |
 946                       BSS_CHANGED_HT |
 947                       BSS_CHANGED_BASIC_RATES |
 948                       BSS_CHANGED_BEACON_INT |
 949                       BSS_CHANGED_MCAST_RATE;
 950
 951         local->fif_other_bss++;
 952         /* mesh ifaces must set allmulti to forward mcast traffic */
 953         atomic_inc(&local->iff_allmultis);
 954         ieee80211_configure_filter(local);
 955
 956         ifmsh->mesh_cc_id = 0;  /* Disabled */
 957         /* register sync ops from extensible synchronization framework */
 958         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 959         ifmsh->sync_offset_clockdrift_max = 0;
 960         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 961         ieee80211_mesh_root_setup(ifmsh);
 962         ieee80211_queue_work(&local->hw, &sdata->work);
 963         sdata->vif.bss_conf.ht_operation_mode =
 964                                 ifmsh->mshcfg.ht_opmode;
 965         sdata->vif.bss_conf.enable_beacon = true;
 966
 967         changed |= ieee80211_mps_local_status_update(sdata);
 968
 969         if (ieee80211_mesh_build_beacon(ifmsh)) {
 970                 ieee80211_stop_mesh(sdata);
 971                 return -ENOMEM;
 972         }
 973
 974         ieee80211_recalc_dtim(local, sdata);
 975         ieee80211_bss_info_change_notify(sdata, changed);
 976
 977         netif_carrier_on(sdata->dev);
 978         return 0;
 979 }
 980
 981 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 982 {
 983         struct ieee80211_local *local = sdata->local;
 984         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 985         struct beacon_data *bcn;
 986
 987         netif_carrier_off(sdata->dev);
 988
 989         /* flush STAs and mpaths on this iface */
 990         sta_info_flush(sdata);
 991         ieee80211_free_keys(sdata, true);
 992         mesh_path_flush_by_iface(sdata);
 993
 994         /* stop the beacon */
 995         ifmsh->mesh_id_len = 0;
 996         sdata->vif.bss_conf.enable_beacon = false;
 997         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 998         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 999
1000         /* remove beacon */
1001         bcn = rcu_dereference_protected(ifmsh->beacon,
1002                                         lockdep_is_held(&sdata->wdev.mtx));
1003         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1004         kfree_rcu(bcn, rcu_head);
1005
1006         /* free all potentially still buffered group-addressed frames */
1007         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1008         skb_queue_purge(&ifmsh->ps.bc_buf);
1009
1010         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
1011         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
1012         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
1013
1014         /* clear any mesh work (for next join) we may have accrued */
1015         ifmsh->wrkq_flags = 0;
1016         ifmsh->mbss_changed = 0;
1017
1018         local->fif_other_bss--;
1019         atomic_dec(&local->iff_allmultis);
1020         ieee80211_configure_filter(local);
1021 }
1022
1023 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1024 {
1025         int err;
1026
1027         /* if the current channel is a DFS channel, mark the channel as
1028          * unavailable.
1029          */
1030         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1031                                             &sdata->vif.bss_conf.chandef,
1032                                             NL80211_IFTYPE_MESH_POINT);
1033         if (err > 0)
1034                 cfg80211_radar_event(sdata->local->hw.wiphy,
1035                                      &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
1036 }
1037
1038 static bool
1039 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1040                                  struct ieee802_11_elems *elems, bool beacon)
1041 {
1042         struct cfg80211_csa_settings params;
1043         struct ieee80211_csa_ie csa_ie;
1044         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1045         struct ieee80211_supported_band *sband;
1046         int err;
1047         u32 sta_flags;
1048
1049         sdata_assert_lock(sdata);
1050
1051         sband = ieee80211_get_sband(sdata);
1052         if (!sband)
1053                 return false;
1054
1055         sta_flags = 0;
1056         switch (sdata->vif.bss_conf.chandef.width) {
1057         case NL80211_CHAN_WIDTH_20_NOHT:
1058                 sta_flags |= IEEE80211_STA_DISABLE_HT;
1059                 /* fall through */
1060         case NL80211_CHAN_WIDTH_20:
1061                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
1062                 /* fall through */
1063         case NL80211_CHAN_WIDTH_40:
1064                 sta_flags |= IEEE80211_STA_DISABLE_VHT;
1065                 break;
1066         default:
1067                 break;
1068         }
1069
1070         memset(&params, 0, sizeof(params));
1071         err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1072                                            sta_flags, sdata->vif.addr,
1073                                            &csa_ie);
1074         if (err < 0)
1075                 return false;
1076         if (err)
1077                 return false;
1078
1079         /* Mark the channel unavailable if the reason for the switch is
1080          * regulatory.
1081          */
1082         if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1083                 ieee80211_mesh_csa_mark_radar(sdata);
1084
1085         params.chandef = csa_ie.chandef;
1086         params.count = csa_ie.count;
1087
1088         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
1089                                      IEEE80211_CHAN_DISABLED) ||
1090             !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
1091                                      NL80211_IFTYPE_MESH_POINT)) {
1092                 sdata_info(sdata,
1093                            "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1094                            sdata->vif.addr,
1095                            params.chandef.chan->center_freq,
1096                            params.chandef.width,
1097                            params.chandef.center_freq1,
1098                            params.chandef.center_freq2);
1099                 return false;
1100         }
1101
1102         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1103                                             &params.chandef,
1104                                             NL80211_IFTYPE_MESH_POINT);
1105         if (err < 0)
1106                 return false;
1107         if (err > 0 && !ifmsh->userspace_handles_dfs) {
1108                 sdata_info(sdata,
1109                            "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1110                            sdata->vif.addr,
1111                            params.chandef.chan->center_freq,
1112                            params.chandef.width,
1113                            params.chandef.center_freq1,
1114                            params.chandef.center_freq2);
1115                 return false;
1116         }
1117
1118         params.radar_required = err;
1119
1120         if (cfg80211_chandef_identical(&params.chandef,
1121                                        &sdata->vif.bss_conf.chandef)) {
1122                 mcsa_dbg(sdata,
1123                          "received csa with an identical chandef, ignoring\n");
1124                 return true;
1125         }
1126
1127         mcsa_dbg(sdata,
1128                  "received channel switch announcement to go to channel %d MHz\n",
1129                  params.chandef.chan->center_freq);
1130
1131         params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1132         if (beacon) {
1133                 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1134                 if (ifmsh->pre_value >= csa_ie.pre_value)
1135                         return false;
1136                 ifmsh->pre_value = csa_ie.pre_value;
1137         }
1138
1139         if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1140                 return false;
1141
1142         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1143
1144         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1145                                      &params) < 0)
1146                 return false;
1147
1148         return true;
1149 }
1150
1151 static void
1152 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1153                             struct ieee80211_mgmt *mgmt, size_t len)
1154 {
1155         struct ieee80211_local *local = sdata->local;
1156         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1157         struct sk_buff *presp;
1158         struct beacon_data *bcn;
1159         struct ieee80211_mgmt *hdr;
1160         struct ieee802_11_elems elems;
1161         size_t baselen;
1162         u8 *pos;
1163
1164         pos = mgmt->u.probe_req.variable;
1165         baselen = (u8 *) pos - (u8 *) mgmt;
1166         if (baselen > len)
1167                 return;
1168
1169         ieee802_11_parse_elems(pos, len - baselen, false, &elems, mgmt->bssid,
1170                                NULL);
1171
1172         if (!elems.mesh_id)
1173                 return;
1174
1175         /* 802.11-2012 10.1.4.3.2 */
1176         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1177              !is_broadcast_ether_addr(mgmt->da)) ||
1178             elems.ssid_len != 0)
1179                 return;
1180
1181         if (elems.mesh_id_len != 0 &&
1182             (elems.mesh_id_len != ifmsh->mesh_id_len ||
1183              memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1184                 return;
1185
1186         rcu_read_lock();
1187         bcn = rcu_dereference(ifmsh->beacon);
1188
1189         if (!bcn)
1190                 goto out;
1191
1192         presp = dev_alloc_skb(local->tx_headroom +
1193                               bcn->head_len + bcn->tail_len);
1194         if (!presp)
1195                 goto out;
1196
1197         skb_reserve(presp, local->tx_headroom);
1198         skb_put_data(presp, bcn->head, bcn->head_len);
1199         skb_put_data(presp, bcn->tail, bcn->tail_len);
1200         hdr = (struct ieee80211_mgmt *) presp->data;
1201         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1202                                          IEEE80211_STYPE_PROBE_RESP);
1203         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1204         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1205         ieee80211_tx_skb(sdata, presp);
1206 out:
1207         rcu_read_unlock();
1208 }
1209
1210 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1211                                         u16 stype,
1212                                         struct ieee80211_mgmt *mgmt,
1213                                         size_t len,
1214                                         struct ieee80211_rx_status *rx_status)
1215 {
1216         struct ieee80211_local *local = sdata->local;
1217         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1218         struct ieee802_11_elems elems;
1219         struct ieee80211_channel *channel;
1220         size_t baselen;
1221         int freq;
1222         enum nl80211_band band = rx_status->band;
1223
1224         /* ignore ProbeResp to foreign address */
1225         if (stype == IEEE80211_STYPE_PROBE_RESP &&
1226             !ether_addr_equal(mgmt->da, sdata->vif.addr))
1227                 return;
1228
1229         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1230         if (baselen > len)
1231                 return;
1232
1233         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1234                                false, &elems, mgmt->bssid, NULL);
1235
1236         /* ignore non-mesh or secure / unsecure mismatch */
1237         if ((!elems.mesh_id || !elems.mesh_config) ||
1238             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1239             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1240                 return;
1241
1242         if (elems.ds_params)
1243                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1244         else
1245                 freq = rx_status->freq;
1246
1247         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1248
1249         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1250                 return;
1251
1252         if (mesh_matches_local(sdata, &elems)) {
1253                 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1254                         sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1255                 if (!sdata->u.mesh.user_mpm ||
1256                     sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1257                     sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1258                         mesh_neighbour_update(sdata, mgmt->sa, &elems,
1259                                               rx_status);
1260         }
1261
1262         if (ifmsh->sync_ops)
1263                 ifmsh->sync_ops->rx_bcn_presp(sdata,
1264                         stype, mgmt, &elems, rx_status);
1265
1266         if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1267             !sdata->vif.csa_active)
1268                 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1269 }
1270
1271 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1272 {
1273         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1274         struct mesh_csa_settings *tmp_csa_settings;
1275         int ret = 0;
1276         int changed = 0;
1277
1278         /* Reset the TTL value and Initiator flag */
1279         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1280         ifmsh->chsw_ttl = 0;
1281
1282         /* Remove the CSA and MCSP elements from the beacon */
1283         tmp_csa_settings = rcu_dereference_protected(ifmsh->csa,
1284                                             lockdep_is_held(&sdata->wdev.mtx));
1285         RCU_INIT_POINTER(ifmsh->csa, NULL);
1286         if (tmp_csa_settings)
1287                 kfree_rcu(tmp_csa_settings, rcu_head);
1288         ret = ieee80211_mesh_rebuild_beacon(sdata);
1289         if (ret)
1290                 return -EINVAL;
1291
1292         changed |= BSS_CHANGED_BEACON;
1293
1294         mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1295                  sdata->vif.bss_conf.chandef.chan->center_freq);
1296         return changed;
1297 }
1298
1299 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1300                               struct cfg80211_csa_settings *csa_settings)
1301 {
1302         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1303         struct mesh_csa_settings *tmp_csa_settings;
1304         int ret = 0;
1305
1306         lockdep_assert_held(&sdata->wdev.mtx);
1307
1308         tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1309                                    GFP_ATOMIC);
1310         if (!tmp_csa_settings)
1311                 return -ENOMEM;
1312
1313         memcpy(&tmp_csa_settings->settings, csa_settings,
1314                sizeof(struct cfg80211_csa_settings));
1315
1316         rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1317
1318         ret = ieee80211_mesh_rebuild_beacon(sdata);
1319         if (ret) {
1320                 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1321                 RCU_INIT_POINTER(ifmsh->csa, NULL);
1322                 kfree_rcu(tmp_csa_settings, rcu_head);
1323                 return ret;
1324         }
1325
1326         return BSS_CHANGED_BEACON;
1327 }
1328
1329 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1330                                struct ieee80211_mgmt *mgmt, size_t len,
1331                                struct ieee802_11_elems *elems)
1332 {
1333         struct ieee80211_mgmt *mgmt_fwd;
1334         struct sk_buff *skb;
1335         struct ieee80211_local *local = sdata->local;
1336
1337         skb = dev_alloc_skb(local->tx_headroom + len);
1338         if (!skb)
1339                 return -ENOMEM;
1340         skb_reserve(skb, local->tx_headroom);
1341         mgmt_fwd = skb_put(skb, len);
1342
1343         elems->mesh_chansw_params_ie->mesh_ttl--;
1344         elems->mesh_chansw_params_ie->mesh_flags &=
1345                 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1346
1347         memcpy(mgmt_fwd, mgmt, len);
1348         eth_broadcast_addr(mgmt_fwd->da);
1349         memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1350         memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1351
1352         ieee80211_tx_skb(sdata, skb);
1353         return 0;
1354 }
1355
1356 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1357                               struct ieee80211_mgmt *mgmt, size_t len)
1358 {
1359         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1360         struct ieee802_11_elems elems;
1361         u16 pre_value;
1362         bool fwd_csa = true;
1363         size_t baselen;
1364         u8 *pos;
1365
1366         if (mgmt->u.action.u.measurement.action_code !=
1367             WLAN_ACTION_SPCT_CHL_SWITCH)
1368                 return;
1369
1370         pos = mgmt->u.action.u.chan_switch.variable;
1371         baselen = offsetof(struct ieee80211_mgmt,
1372                            u.action.u.chan_switch.variable);
1373         ieee802_11_parse_elems(pos, len - baselen, true, &elems,
1374                                mgmt->bssid, NULL);
1375
1376         ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1377         if (!--ifmsh->chsw_ttl)
1378                 fwd_csa = false;
1379
1380         pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1381         if (ifmsh->pre_value >= pre_value)
1382                 return;
1383
1384         ifmsh->pre_value = pre_value;
1385
1386         if (!sdata->vif.csa_active &&
1387             !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1388                 mcsa_dbg(sdata, "Failed to process CSA action frame");
1389                 return;
1390         }
1391
1392         /* forward or re-broadcast the CSA frame */
1393         if (fwd_csa) {
1394                 if (mesh_fwd_csa_frame(sdata, mgmt, len, &elems) < 0)
1395                         mcsa_dbg(sdata, "Failed to forward the CSA frame");
1396         }
1397 }
1398
1399 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1400                                           struct ieee80211_mgmt *mgmt,
1401                                           size_t len,
1402                                           struct ieee80211_rx_status *rx_status)
1403 {
1404         switch (mgmt->u.action.category) {
1405         case WLAN_CATEGORY_SELF_PROTECTED:
1406                 switch (mgmt->u.action.u.self_prot.action_code) {
1407                 case WLAN_SP_MESH_PEERING_OPEN:
1408                 case WLAN_SP_MESH_PEERING_CLOSE:
1409                 case WLAN_SP_MESH_PEERING_CONFIRM:
1410                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1411                         break;
1412                 }
1413                 break;
1414         case WLAN_CATEGORY_MESH_ACTION:
1415                 if (mesh_action_is_path_sel(mgmt))
1416                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1417                 break;
1418         case WLAN_CATEGORY_SPECTRUM_MGMT:
1419                 mesh_rx_csa_frame(sdata, mgmt, len);
1420                 break;
1421         }
1422 }
1423
1424 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1425                                    struct sk_buff *skb)
1426 {
1427         struct ieee80211_rx_status *rx_status;
1428         struct ieee80211_mgmt *mgmt;
1429         u16 stype;
1430
1431         sdata_lock(sdata);
1432
1433         /* mesh already went down */
1434         if (!sdata->u.mesh.mesh_id_len)
1435                 goto out;
1436
1437         rx_status = IEEE80211_SKB_RXCB(skb);
1438         mgmt = (struct ieee80211_mgmt *) skb->data;
1439         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1440
1441         switch (stype) {
1442         case IEEE80211_STYPE_PROBE_RESP:
1443         case IEEE80211_STYPE_BEACON:
1444                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1445                                             rx_status);
1446                 break;
1447         case IEEE80211_STYPE_PROBE_REQ:
1448                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1449                 break;
1450         case IEEE80211_STYPE_ACTION:
1451                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1452                 break;
1453         }
1454 out:
1455         sdata_unlock(sdata);
1456 }
1457
1458 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1459 {
1460         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1461         u32 bit, changed = 0;
1462
1463         for_each_set_bit(bit, &ifmsh->mbss_changed,
1464                          sizeof(changed) * BITS_PER_BYTE) {
1465                 clear_bit(bit, &ifmsh->mbss_changed);
1466                 changed |= BIT(bit);
1467         }
1468
1469         if (sdata->vif.bss_conf.enable_beacon &&
1470             (changed & (BSS_CHANGED_BEACON |
1471                         BSS_CHANGED_HT |
1472                         BSS_CHANGED_BASIC_RATES |
1473                         BSS_CHANGED_BEACON_INT)))
1474                 if (ieee80211_mesh_rebuild_beacon(sdata))
1475                         return;
1476
1477         ieee80211_bss_info_change_notify(sdata, changed);
1478 }
1479
1480 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1481 {
1482         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1483
1484         sdata_lock(sdata);
1485
1486         /* mesh already went down */
1487         if (!sdata->u.mesh.mesh_id_len)
1488                 goto out;
1489
1490         if (ifmsh->preq_queue_len &&
1491             time_after(jiffies,
1492                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1493                 mesh_path_start_discovery(sdata);
1494
1495         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1496                 ieee80211_mesh_housekeeping(sdata);
1497
1498         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1499                 ieee80211_mesh_rootpath(sdata);
1500
1501         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1502                 mesh_sync_adjust_tsf(sdata);
1503
1504         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1505                 mesh_bss_info_changed(sdata);
1506 out:
1507         sdata_unlock(sdata);
1508 }
1509
1510
1511 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1512 {
1513         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1514         static u8 zero_addr[ETH_ALEN] = {};
1515
1516         timer_setup(&ifmsh->housekeeping_timer,
1517                     ieee80211_mesh_housekeeping_timer, 0);
1518
1519         ifmsh->accepting_plinks = true;
1520         atomic_set(&ifmsh->mpaths, 0);
1521         mesh_rmc_init(sdata);
1522         ifmsh->last_preq = jiffies;
1523         ifmsh->next_perr = jiffies;
1524         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1525         /* Allocate all mesh structures when creating the first mesh interface. */
1526         if (!mesh_allocated)
1527                 ieee80211s_init();
1528
1529         mesh_pathtbl_init(sdata);
1530
1531         timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1532         timer_setup(&ifmsh->mesh_path_root_timer,
1533                     ieee80211_mesh_path_root_timer, 0);
1534         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1535         skb_queue_head_init(&ifmsh->ps.bc_buf);
1536         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1537         spin_lock_init(&ifmsh->sync_offset_lock);
1538         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1539
1540         sdata->vif.bss_conf.bssid = zero_addr;
1541 }
1542
1543 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1544 {
1545         mesh_rmc_free(sdata);
1546         mesh_pathtbl_unregister(sdata);
1547 }