net/mac80211/mesh.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2008, 2009 open80211s Ltd.
   4  * Copyright (C) 2018 - 2020 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 "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         u32 vht_cap_info = 0;
  67
  68         /*
  69          * As support for each feature is added, check for matching
  70          * - On mesh config capabilities
  71          *   - Power Save Support En
  72          *   - Sync support enabled
  73          *   - Sync support active
  74          *   - Sync support required from peer
  75          *   - MDA enabled
  76          * - Power management control on fc
  77          */
  78         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
  79              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  80              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  81              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  82              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  83              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  84              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  85                 return false;
  86
  87         sband = ieee80211_get_sband(sdata);
  88         if (!sband)
  89                 return false;
  90
  91         ieee80211_sta_get_rates(sdata, ie, sband->band,
  92                                 &basic_rates);
  93
  94         if (sdata->vif.bss_conf.basic_rates != basic_rates)
  95                 return false;
  96
  97         cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
  98                                 NL80211_CHAN_NO_HT);
  99         ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
 100
 101         if (ie->vht_cap_elem)
 102                 vht_cap_info = le32_to_cpu(ie->vht_cap_elem->vht_cap_info);
 103
 104         ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info,
 105                                    ie->vht_operation, ie->ht_operation,
 106                                    &sta_chan_def);
 107         ieee80211_chandef_he_6ghz_oper(sdata, ie->he_operation, &sta_chan_def);
 108
 109         if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
 110                                          &sta_chan_def))
 111                 return false;
 112
 113         return true;
 114 }
 115
 116 /**
 117  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 118  *
 119  * @ie: information elements of a management frame from the mesh peer
 120  */
 121 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 122 {
 123         return (ie->mesh_config->meshconf_cap &
 124                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 125 }
 126
 127 /**
 128  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
 129  *
 130  * @sdata: mesh interface in which mesh beacons are going to be updated
 131  *
 132  * Returns: beacon changed flag if the beacon content changed.
 133  */
 134 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 135 {
 136         bool free_plinks;
 137         u32 changed = 0;
 138
 139         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 140          * the mesh interface might be able to establish plinks with peers that
 141          * are already on the table but are not on PLINK_ESTAB state. However,
 142          * in general the mesh interface is not accepting peer link requests
 143          * from new peers, and that must be reflected in the beacon
 144          */
 145         free_plinks = mesh_plink_availables(sdata);
 146
 147         if (free_plinks != sdata->u.mesh.accepting_plinks) {
 148                 sdata->u.mesh.accepting_plinks = free_plinks;
 149                 changed = BSS_CHANGED_BEACON;
 150         }
 151
 152         return changed;
 153 }
 154
 155 /*
 156  * mesh_sta_cleanup - clean up any mesh sta state
 157  *
 158  * @sta: mesh sta to clean up.
 159  */
 160 void mesh_sta_cleanup(struct sta_info *sta)
 161 {
 162         struct ieee80211_sub_if_data *sdata = sta->sdata;
 163         u32 changed = mesh_plink_deactivate(sta);
 164
 165         if (changed)
 166                 ieee80211_mbss_info_change_notify(sdata, changed);
 167 }
 168
 169 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 170 {
 171         int i;
 172
 173         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 174         if (!sdata->u.mesh.rmc)
 175                 return -ENOMEM;
 176         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 177         for (i = 0; i < RMC_BUCKETS; i++)
 178                 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
 179         return 0;
 180 }
 181
 182 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 183 {
 184         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 185         struct rmc_entry *p;
 186         struct hlist_node *n;
 187         int i;
 188
 189         if (!sdata->u.mesh.rmc)
 190                 return;
 191
 192         for (i = 0; i < RMC_BUCKETS; i++) {
 193                 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 194                         hlist_del(&p->list);
 195                         kmem_cache_free(rm_cache, p);
 196                 }
 197         }
 198
 199         kfree(rmc);
 200         sdata->u.mesh.rmc = NULL;
 201 }
 202
 203 /**
 204  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 205  *
 206  * @sdata:      interface
 207  * @sa:         source address
 208  * @mesh_hdr:   mesh_header
 209  *
 210  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 211  *
 212  * Checks using the source address and the mesh sequence number if we have
 213  * received this frame lately. If the frame is not in the cache, it is added to
 214  * it.
 215  */
 216 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
 217                    const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
 218 {
 219         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 220         u32 seqnum = 0;
 221         int entries = 0;
 222         u8 idx;
 223         struct rmc_entry *p;
 224         struct hlist_node *n;
 225
 226         if (!rmc)
 227                 return -1;
 228
 229         /* Don't care about endianness since only match matters */
 230         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 231         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 232         hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 233                 ++entries;
 234                 if (time_after(jiffies, p->exp_time) ||
 235                     entries == RMC_QUEUE_MAX_LEN) {
 236                         hlist_del(&p->list);
 237                         kmem_cache_free(rm_cache, p);
 238                         --entries;
 239                 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
 240                         return -1;
 241         }
 242
 243         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 244         if (!p)
 245                 return 0;
 246
 247         p->seqnum = seqnum;
 248         p->exp_time = jiffies + RMC_TIMEOUT;
 249         memcpy(p->sa, sa, ETH_ALEN);
 250         hlist_add_head(&p->list, &rmc->bucket[idx]);
 251         return 0;
 252 }
 253
 254 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
 255                          struct sk_buff *skb)
 256 {
 257         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 258         u8 *pos, neighbors;
 259         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 260         bool is_connected_to_gate = ifmsh->num_gates > 0 ||
 261                 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
 262                 ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
 263         bool is_connected_to_as = ifmsh->mshcfg.dot11MeshConnectedToAuthServer;
 264
 265         if (skb_tailroom(skb) < 2 + meshconf_len)
 266                 return -ENOMEM;
 267
 268         pos = skb_put(skb, 2 + meshconf_len);
 269         *pos++ = WLAN_EID_MESH_CONFIG;
 270         *pos++ = meshconf_len;
 271
 272         /* save a pointer for quick updates in pre-tbtt */
 273         ifmsh->meshconf_offset = pos - skb->data;
 274
 275         /* Active path selection protocol ID */
 276         *pos++ = ifmsh->mesh_pp_id;
 277         /* Active path selection metric ID   */
 278         *pos++ = ifmsh->mesh_pm_id;
 279         /* Congestion control mode identifier */
 280         *pos++ = ifmsh->mesh_cc_id;
 281         /* Synchronization protocol identifier */
 282         *pos++ = ifmsh->mesh_sp_id;
 283         /* Authentication Protocol identifier */
 284         *pos++ = ifmsh->mesh_auth_id;
 285         /* Mesh Formation Info - number of neighbors */
 286         neighbors = atomic_read(&ifmsh->estab_plinks);
 287         neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
 288         *pos++ = (is_connected_to_as << 7) |
 289                  (neighbors << 1) |
 290                  is_connected_to_gate;
 291         /* Mesh capability */
 292         *pos = 0x00;
 293         *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
 294                         IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
 295         *pos |= ifmsh->accepting_plinks ?
 296                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 297         /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
 298         *pos |= ifmsh->ps_peers_deep_sleep ?
 299                         IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
 300         return 0;
 301 }
 302
 303 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 304 {
 305         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 306         u8 *pos;
 307
 308         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 309                 return -ENOMEM;
 310
 311         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 312         *pos++ = WLAN_EID_MESH_ID;
 313         *pos++ = ifmsh->mesh_id_len;
 314         if (ifmsh->mesh_id_len)
 315                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 316
 317         return 0;
 318 }
 319
 320 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
 321                                     struct sk_buff *skb)
 322 {
 323         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 324         u8 *pos;
 325
 326         /* see IEEE802.11-2012 13.14.6 */
 327         if (ifmsh->ps_peers_light_sleep == 0 &&
 328             ifmsh->ps_peers_deep_sleep == 0 &&
 329             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
 330                 return 0;
 331
 332         if (skb_tailroom(skb) < 4)
 333                 return -ENOMEM;
 334
 335         pos = skb_put(skb, 2 + 2);
 336         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
 337         *pos++ = 2;
 338         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 339
 340         return 0;
 341 }
 342
 343 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 344                         struct sk_buff *skb)
 345 {
 346         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 347         u8 offset, len;
 348         const u8 *data;
 349
 350         if (!ifmsh->ie || !ifmsh->ie_len)
 351                 return 0;
 352
 353         /* fast-forward to vendor IEs */
 354         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 355
 356         if (offset < ifmsh->ie_len) {
 357                 len = ifmsh->ie_len - offset;
 358                 data = ifmsh->ie + offset;
 359                 if (skb_tailroom(skb) < len)
 360                         return -ENOMEM;
 361                 skb_put_data(skb, data, len);
 362         }
 363
 364         return 0;
 365 }
 366
 367 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 368 {
 369         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 370         u8 len = 0;
 371         const u8 *data;
 372
 373         if (!ifmsh->ie || !ifmsh->ie_len)
 374                 return 0;
 375
 376         /* find RSN IE */
 377         data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
 378         if (!data)
 379                 return 0;
 380
 381         len = data[1] + 2;
 382
 383         if (skb_tailroom(skb) < len)
 384                 return -ENOMEM;
 385         skb_put_data(skb, data, len);
 386
 387         return 0;
 388 }
 389
 390 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
 391                                  struct sk_buff *skb)
 392 {
 393         struct ieee80211_chanctx_conf *chanctx_conf;
 394         struct ieee80211_channel *chan;
 395         u8 *pos;
 396
 397         if (skb_tailroom(skb) < 3)
 398                 return -ENOMEM;
 399
 400         rcu_read_lock();
 401         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 402         if (WARN_ON(!chanctx_conf)) {
 403                 rcu_read_unlock();
 404                 return -EINVAL;
 405         }
 406         chan = chanctx_conf->def.chan;
 407         rcu_read_unlock();
 408
 409         pos = skb_put(skb, 2 + 1);
 410         *pos++ = WLAN_EID_DS_PARAMS;
 411         *pos++ = 1;
 412         *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 413
 414         return 0;
 415 }
 416
 417 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
 418                        struct sk_buff *skb)
 419 {
 420         struct ieee80211_supported_band *sband;
 421         u8 *pos;
 422
 423         sband = ieee80211_get_sband(sdata);
 424         if (!sband)
 425                 return -EINVAL;
 426
 427         /* HT not allowed in 6 GHz */
 428         if (sband->band == NL80211_BAND_6GHZ)
 429                 return 0;
 430
 431         if (!sband->ht_cap.ht_supported ||
 432             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 433             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 434             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 435                 return 0;
 436
 437         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 438                 return -ENOMEM;
 439
 440         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 441         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 442
 443         return 0;
 444 }
 445
 446 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
 447                         struct sk_buff *skb)
 448 {
 449         struct ieee80211_local *local = sdata->local;
 450         struct ieee80211_chanctx_conf *chanctx_conf;
 451         struct ieee80211_channel *channel;
 452         struct ieee80211_supported_band *sband;
 453         struct ieee80211_sta_ht_cap *ht_cap;
 454         u8 *pos;
 455
 456         rcu_read_lock();
 457         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 458         if (WARN_ON(!chanctx_conf)) {
 459                 rcu_read_unlock();
 460                 return -EINVAL;
 461         }
 462         channel = chanctx_conf->def.chan;
 463         rcu_read_unlock();
 464
 465         sband = local->hw.wiphy->bands[channel->band];
 466         ht_cap = &sband->ht_cap;
 467
 468         /* HT not allowed in 6 GHz */
 469         if (sband->band == NL80211_BAND_6GHZ)
 470                 return 0;
 471
 472         if (!ht_cap->ht_supported ||
 473             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 474             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 475             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 476                 return 0;
 477
 478         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 479                 return -ENOMEM;
 480
 481         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 482         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
 483                                    sdata->vif.bss_conf.ht_operation_mode,
 484                                    false);
 485
 486         return 0;
 487 }
 488
 489 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
 490                         struct sk_buff *skb)
 491 {
 492         struct ieee80211_supported_band *sband;
 493         u8 *pos;
 494
 495         sband = ieee80211_get_sband(sdata);
 496         if (!sband)
 497                 return -EINVAL;
 498
 499         /* VHT not allowed in 6 GHz */
 500         if (sband->band == NL80211_BAND_6GHZ)
 501                 return 0;
 502
 503         if (!sband->vht_cap.vht_supported ||
 504             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 505             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 506             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 507                 return 0;
 508
 509         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
 510                 return -ENOMEM;
 511
 512         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
 513         ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
 514
 515         return 0;
 516 }
 517
 518 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
 519                          struct sk_buff *skb)
 520 {
 521         struct ieee80211_local *local = sdata->local;
 522         struct ieee80211_chanctx_conf *chanctx_conf;
 523         struct ieee80211_channel *channel;
 524         struct ieee80211_supported_band *sband;
 525         struct ieee80211_sta_vht_cap *vht_cap;
 526         u8 *pos;
 527
 528         rcu_read_lock();
 529         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 530         if (WARN_ON(!chanctx_conf)) {
 531                 rcu_read_unlock();
 532                 return -EINVAL;
 533         }
 534         channel = chanctx_conf->def.chan;
 535         rcu_read_unlock();
 536
 537         sband = local->hw.wiphy->bands[channel->band];
 538         vht_cap = &sband->vht_cap;
 539
 540         /* VHT not allowed in 6 GHz */
 541         if (sband->band == NL80211_BAND_6GHZ)
 542                 return 0;
 543
 544         if (!vht_cap->vht_supported ||
 545             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 546             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 547             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 548                 return 0;
 549
 550         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
 551                 return -ENOMEM;
 552
 553         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 554         ieee80211_ie_build_vht_oper(pos, vht_cap,
 555                                     &sdata->vif.bss_conf.chandef);
 556
 557         return 0;
 558 }
 559
 560 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
 561                        struct sk_buff *skb, u8 ie_len)
 562 {
 563         const struct ieee80211_sta_he_cap *he_cap;
 564         struct ieee80211_supported_band *sband;
 565         u8 *pos;
 566
 567         sband = ieee80211_get_sband(sdata);
 568         if (!sband)
 569                 return -EINVAL;
 570
 571         he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 572
 573         if (!he_cap ||
 574             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 575             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 576             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 577                 return 0;
 578
 579         if (skb_tailroom(skb) < ie_len)
 580                 return -ENOMEM;
 581
 582         pos = skb_put(skb, ie_len);
 583         ieee80211_ie_build_he_cap(pos, he_cap, pos + ie_len);
 584
 585         return 0;
 586 }
 587
 588 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
 589                         struct sk_buff *skb)
 590 {
 591         const struct ieee80211_sta_he_cap *he_cap;
 592         struct ieee80211_supported_band *sband;
 593         u32 len;
 594         u8 *pos;
 595
 596         sband = ieee80211_get_sband(sdata);
 597         if (!sband)
 598                 return -EINVAL;
 599
 600         he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 601         if (!he_cap ||
 602             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 603             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 604             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 605                 return 0;
 606
 607         len = 2 + 1 + sizeof(struct ieee80211_he_operation);
 608         if (sdata->vif.bss_conf.chandef.chan->band == NL80211_BAND_6GHZ)
 609                 len += sizeof(struct ieee80211_he_6ghz_oper);
 610
 611         if (skb_tailroom(skb) < len)
 612                 return -ENOMEM;
 613
 614         pos = skb_put(skb, len);
 615         ieee80211_ie_build_he_oper(pos, &sdata->vif.bss_conf.chandef);
 616
 617         return 0;
 618 }
 619
 620 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata,
 621                             struct sk_buff *skb)
 622 {
 623         struct ieee80211_supported_band *sband;
 624         const struct ieee80211_sband_iftype_data *iftd;
 625
 626         sband = ieee80211_get_sband(sdata);
 627         if (!sband)
 628                 return -EINVAL;
 629
 630         iftd = ieee80211_get_sband_iftype_data(sband,
 631                                                NL80211_IFTYPE_MESH_POINT);
 632         /* The device doesn't support HE in mesh mode or at all */
 633         if (!iftd)
 634                 return 0;
 635
 636         ieee80211_ie_build_he_6ghz_cap(sdata, skb);
 637         return 0;
 638 }
 639
 640 static void ieee80211_mesh_path_timer(struct timer_list *t)
 641 {
 642         struct ieee80211_sub_if_data *sdata =
 643                 from_timer(sdata, t, u.mesh.mesh_path_timer);
 644
 645         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 646 }
 647
 648 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
 649 {
 650         struct ieee80211_sub_if_data *sdata =
 651                 from_timer(sdata, t, u.mesh.mesh_path_root_timer);
 652         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 653
 654         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 655
 656         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 657 }
 658
 659 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 660 {
 661         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 662                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 663         else {
 664                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 665                 /* stop running timer */
 666                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 667         }
 668 }
 669
 670 /**
 671  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 672  * @hdr:        802.11 frame header
 673  * @fc:         frame control field
 674  * @meshda:     destination address in the mesh
 675  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 676  *              locally originated.
 677  *
 678  * Return the length of the 802.11 (does not include a mesh control header)
 679  */
 680 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 681                                   const u8 *meshda, const u8 *meshsa)
 682 {
 683         if (is_multicast_ether_addr(meshda)) {
 684                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 685                 /* DA TA SA */
 686                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 687                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 688                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 689                 return 24;
 690         } else {
 691                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 692                 /* RA TA DA SA */
 693                 eth_zero_addr(hdr->addr1);   /* RA is resolved later */
 694                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 695                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 696                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 697                 return 30;
 698         }
 699 }
 700
 701 /**
 702  * ieee80211_new_mesh_header - create a new mesh header
 703  * @sdata:      mesh interface to be used
 704  * @meshhdr:    uninitialized mesh header
 705  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 706  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 707  *              be NULL.
 708  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 709  *              mesh frame
 710  *
 711  * Return the header length.
 712  */
 713 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 714                                        struct ieee80211s_hdr *meshhdr,
 715                                        const char *addr4or5, const char *addr6)
 716 {
 717         if (WARN_ON(!addr4or5 && addr6))
 718                 return 0;
 719
 720         memset(meshhdr, 0, sizeof(*meshhdr));
 721
 722         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 723
 724         /* FIXME: racy -- TX on multiple queues can be concurrent */
 725         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 726         sdata->u.mesh.mesh_seqnum++;
 727
 728         if (addr4or5 && !addr6) {
 729                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 730                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 731                 return 2 * ETH_ALEN;
 732         } else if (addr4or5 && addr6) {
 733                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 734                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 735                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 736                 return 3 * ETH_ALEN;
 737         }
 738
 739         return ETH_ALEN;
 740 }
 741
 742 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 743 {
 744         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 745         u32 changed;
 746
 747         if (ifmsh->mshcfg.plink_timeout > 0)
 748                 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
 749         mesh_path_expire(sdata);
 750
 751         changed = mesh_accept_plinks_update(sdata);
 752         ieee80211_mbss_info_change_notify(sdata, changed);
 753
 754         mod_timer(&ifmsh->housekeeping_timer,
 755                   round_jiffies(jiffies +
 756                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 757 }
 758
 759 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 760 {
 761         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 762         u32 interval;
 763
 764         mesh_path_tx_root_frame(sdata);
 765
 766         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 767                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 768         else
 769                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 770
 771         mod_timer(&ifmsh->mesh_path_root_timer,
 772                   round_jiffies(TU_TO_EXP_TIME(interval)));
 773 }
 774
 775 static int
 776 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 777 {
 778         struct beacon_data *bcn;
 779         int head_len, tail_len;
 780         struct sk_buff *skb;
 781         struct ieee80211_mgmt *mgmt;
 782         struct ieee80211_chanctx_conf *chanctx_conf;
 783         struct mesh_csa_settings *csa;
 784         enum nl80211_band band;
 785         u8 ie_len_he_cap;
 786         u8 *pos;
 787         struct ieee80211_sub_if_data *sdata;
 788         int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
 789
 790         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 791         rcu_read_lock();
 792         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 793         band = chanctx_conf->def.chan->band;
 794         rcu_read_unlock();
 795
 796         ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
 797                                                 NL80211_IFTYPE_MESH_POINT);
 798         head_len = hdr_len +
 799                    2 + /* NULL SSID */
 800                    /* Channel Switch Announcement */
 801                    2 + sizeof(struct ieee80211_channel_sw_ie) +
 802                    /* Mesh Channel Switch Parameters */
 803                    2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
 804                    /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
 805                    2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
 806                    2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
 807                    2 + 8 + /* supported rates */
 808                    2 + 3; /* DS params */
 809         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 810                    2 + sizeof(struct ieee80211_ht_cap) +
 811                    2 + sizeof(struct ieee80211_ht_operation) +
 812                    2 + ifmsh->mesh_id_len +
 813                    2 + sizeof(struct ieee80211_meshconf_ie) +
 814                    2 + sizeof(__le16) + /* awake window */
 815                    2 + sizeof(struct ieee80211_vht_cap) +
 816                    2 + sizeof(struct ieee80211_vht_operation) +
 817                    ie_len_he_cap +
 818                    2 + 1 + sizeof(struct ieee80211_he_operation) +
 819                            sizeof(struct ieee80211_he_6ghz_oper) +
 820                    2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
 821                    ifmsh->ie_len;
 822
 823         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
 824         /* need an skb for IE builders to operate on */
 825         skb = dev_alloc_skb(max(head_len, tail_len));
 826
 827         if (!bcn || !skb)
 828                 goto out_free;
 829
 830         /*
 831          * pointers go into the block we allocated,
 832          * memory is | beacon_data | head | tail |
 833          */
 834         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
 835
 836         /* fill in the head */
 837         mgmt = skb_put_zero(skb, hdr_len);
 838         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 839                                           IEEE80211_STYPE_BEACON);
 840         eth_broadcast_addr(mgmt->da);
 841         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 842         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 843         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
 844         mgmt->u.beacon.beacon_int =
 845                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
 846         mgmt->u.beacon.capab_info |= cpu_to_le16(
 847                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
 848
 849         pos = skb_put(skb, 2);
 850         *pos++ = WLAN_EID_SSID;
 851         *pos++ = 0x0;
 852
 853         rcu_read_lock();
 854         csa = rcu_dereference(ifmsh->csa);
 855         if (csa) {
 856                 enum nl80211_channel_type ct;
 857                 struct cfg80211_chan_def *chandef;
 858                 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
 859                              2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
 860
 861                 pos = skb_put_zero(skb, ie_len);
 862                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 863                 *pos++ = 3;
 864                 *pos++ = 0x0;
 865                 *pos++ = ieee80211_frequency_to_channel(
 866                                 csa->settings.chandef.chan->center_freq);
 867                 bcn->csa_current_counter = csa->settings.count;
 868                 bcn->csa_counter_offsets[0] = hdr_len + 6;
 869                 *pos++ = csa->settings.count;
 870                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
 871                 *pos++ = 6;
 872                 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
 873                         *pos++ = ifmsh->mshcfg.dot11MeshTTL;
 874                         *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
 875                 } else {
 876                         *pos++ = ifmsh->chsw_ttl;
 877                 }
 878                 *pos++ |= csa->settings.block_tx ?
 879                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
 880                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
 881                 pos += 2;
 882                 put_unaligned_le16(ifmsh->pre_value, pos);
 883                 pos += 2;
 884
 885                 switch (csa->settings.chandef.width) {
 886                 case NL80211_CHAN_WIDTH_40:
 887                         ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
 888                         pos = skb_put_zero(skb, ie_len);
 889
 890                         *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
 891                         *pos++ = 1;                                 /* len */
 892                         ct = cfg80211_get_chandef_type(&csa->settings.chandef);
 893                         if (ct == NL80211_CHAN_HT40PLUS)
 894                                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 895                         else
 896                                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 897                         break;
 898                 case NL80211_CHAN_WIDTH_80:
 899                 case NL80211_CHAN_WIDTH_80P80:
 900                 case NL80211_CHAN_WIDTH_160:
 901                         /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
 902                         ie_len = 2 + 2 +
 903                                  sizeof(struct ieee80211_wide_bw_chansw_ie);
 904                         pos = skb_put_zero(skb, ie_len);
 905
 906                         *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
 907                         *pos++ = 5;                               /* len */
 908                         /* put sub IE */
 909                         chandef = &csa->settings.chandef;
 910                         ieee80211_ie_build_wide_bw_cs(pos, chandef);
 911                         break;
 912                 default:
 913                         break;
 914                 }
 915         }
 916         rcu_read_unlock();
 917
 918         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
 919             mesh_add_ds_params_ie(sdata, skb))
 920                 goto out_free;
 921
 922         bcn->head_len = skb->len;
 923         memcpy(bcn->head, skb->data, bcn->head_len);
 924
 925         /* now the tail */
 926         skb_trim(skb, 0);
 927         bcn->tail = bcn->head + bcn->head_len;
 928
 929         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
 930             mesh_add_rsn_ie(sdata, skb) ||
 931             mesh_add_ht_cap_ie(sdata, skb) ||
 932             mesh_add_ht_oper_ie(sdata, skb) ||
 933             mesh_add_meshid_ie(sdata, skb) ||
 934             mesh_add_meshconf_ie(sdata, skb) ||
 935             mesh_add_awake_window_ie(sdata, skb) ||
 936             mesh_add_vht_cap_ie(sdata, skb) ||
 937             mesh_add_vht_oper_ie(sdata, skb) ||
 938             mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
 939             mesh_add_he_oper_ie(sdata, skb) ||
 940             mesh_add_he_6ghz_cap_ie(sdata, skb) ||
 941             mesh_add_vendor_ies(sdata, skb))
 942                 goto out_free;
 943
 944         bcn->tail_len = skb->len;
 945         memcpy(bcn->tail, skb->data, bcn->tail_len);
 946         bcn->meshconf = (struct ieee80211_meshconf_ie *)
 947                                         (bcn->tail + ifmsh->meshconf_offset);
 948
 949         dev_kfree_skb(skb);
 950         rcu_assign_pointer(ifmsh->beacon, bcn);
 951         return 0;
 952 out_free:
 953         kfree(bcn);
 954         dev_kfree_skb(skb);
 955         return -ENOMEM;
 956 }
 957
 958 static int
 959 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
 960 {
 961         struct beacon_data *old_bcn;
 962         int ret;
 963
 964         old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
 965                                             lockdep_is_held(&sdata->wdev.mtx));
 966         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
 967         if (ret)
 968                 /* just reuse old beacon */
 969                 return ret;
 970
 971         if (old_bcn)
 972                 kfree_rcu(old_bcn, rcu_head);
 973         return 0;
 974 }
 975
 976 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 977                                        u32 changed)
 978 {
 979         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 980         unsigned long bits = changed;
 981         u32 bit;
 982
 983         if (!bits)
 984                 return;
 985
 986         /* if we race with running work, worst case this work becomes a noop */
 987         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
 988                 set_bit(bit, &ifmsh->mbss_changed);
 989         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
 990         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 991 }
 992
 993 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 994 {
 995         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 996         struct ieee80211_local *local = sdata->local;
 997         u32 changed = BSS_CHANGED_BEACON |
 998                       BSS_CHANGED_BEACON_ENABLED |
 999                       BSS_CHANGED_HT |
1000                       BSS_CHANGED_BASIC_RATES |
1001                       BSS_CHANGED_BEACON_INT |
1002                       BSS_CHANGED_MCAST_RATE;
1003
1004         local->fif_other_bss++;
1005         /* mesh ifaces must set allmulti to forward mcast traffic */
1006         atomic_inc(&local->iff_allmultis);
1007         ieee80211_configure_filter(local);
1008
1009         ifmsh->mesh_cc_id = 0;  /* Disabled */
1010         /* register sync ops from extensible synchronization framework */
1011         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
1012         ifmsh->sync_offset_clockdrift_max = 0;
1013         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
1014         ieee80211_mesh_root_setup(ifmsh);
1015         ieee80211_queue_work(&local->hw, &sdata->work);
1016         sdata->vif.bss_conf.ht_operation_mode =
1017                                 ifmsh->mshcfg.ht_opmode;
1018         sdata->vif.bss_conf.enable_beacon = true;
1019
1020         changed |= ieee80211_mps_local_status_update(sdata);
1021
1022         if (ieee80211_mesh_build_beacon(ifmsh)) {
1023                 ieee80211_stop_mesh(sdata);
1024                 return -ENOMEM;
1025         }
1026
1027         ieee80211_recalc_dtim(local, sdata);
1028         ieee80211_bss_info_change_notify(sdata, changed);
1029
1030         netif_carrier_on(sdata->dev);
1031         return 0;
1032 }
1033
1034 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
1035 {
1036         struct ieee80211_local *local = sdata->local;
1037         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1038         struct beacon_data *bcn;
1039
1040         netif_carrier_off(sdata->dev);
1041
1042         /* flush STAs and mpaths on this iface */
1043         sta_info_flush(sdata);
1044         ieee80211_free_keys(sdata, true);
1045         mesh_path_flush_by_iface(sdata);
1046
1047         /* stop the beacon */
1048         ifmsh->mesh_id_len = 0;
1049         sdata->vif.bss_conf.enable_beacon = false;
1050         sdata->beacon_rate_set = false;
1051         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1052         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
1053
1054         /* remove beacon */
1055         bcn = rcu_dereference_protected(ifmsh->beacon,
1056                                         lockdep_is_held(&sdata->wdev.mtx));
1057         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1058         kfree_rcu(bcn, rcu_head);
1059
1060         /* free all potentially still buffered group-addressed frames */
1061         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1062         skb_queue_purge(&ifmsh->ps.bc_buf);
1063
1064         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
1065         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
1066         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
1067
1068         /* clear any mesh work (for next join) we may have accrued */
1069         ifmsh->wrkq_flags = 0;
1070         ifmsh->mbss_changed = 0;
1071
1072         local->fif_other_bss--;
1073         atomic_dec(&local->iff_allmultis);
1074         ieee80211_configure_filter(local);
1075 }
1076
1077 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1078 {
1079         int err;
1080
1081         /* if the current channel is a DFS channel, mark the channel as
1082          * unavailable.
1083          */
1084         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1085                                             &sdata->vif.bss_conf.chandef,
1086                                             NL80211_IFTYPE_MESH_POINT);
1087         if (err > 0)
1088                 cfg80211_radar_event(sdata->local->hw.wiphy,
1089                                      &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
1090 }
1091
1092 static bool
1093 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1094                                  struct ieee802_11_elems *elems, bool beacon)
1095 {
1096         struct cfg80211_csa_settings params;
1097         struct ieee80211_csa_ie csa_ie;
1098         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1099         struct ieee80211_supported_band *sband;
1100         int err;
1101         u32 sta_flags, vht_cap_info = 0;
1102
1103         sdata_assert_lock(sdata);
1104
1105         sband = ieee80211_get_sband(sdata);
1106         if (!sband)
1107                 return false;
1108
1109         sta_flags = 0;
1110         switch (sdata->vif.bss_conf.chandef.width) {
1111         case NL80211_CHAN_WIDTH_20_NOHT:
1112                 sta_flags |= IEEE80211_STA_DISABLE_HT;
1113                 fallthrough;
1114         case NL80211_CHAN_WIDTH_20:
1115                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
1116                 fallthrough;
1117         case NL80211_CHAN_WIDTH_40:
1118                 sta_flags |= IEEE80211_STA_DISABLE_VHT;
1119                 break;
1120         default:
1121                 break;
1122         }
1123
1124         if (elems->vht_cap_elem)
1125                 vht_cap_info =
1126                         le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1127
1128         memset(&params, 0, sizeof(params));
1129         err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1130                                            vht_cap_info,
1131                                            sta_flags, sdata->vif.addr,
1132                                            &csa_ie);
1133         if (err < 0)
1134                 return false;
1135         if (err)
1136                 return false;
1137
1138         /* Mark the channel unavailable if the reason for the switch is
1139          * regulatory.
1140          */
1141         if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1142                 ieee80211_mesh_csa_mark_radar(sdata);
1143
1144         params.chandef = csa_ie.chandef;
1145         params.count = csa_ie.count;
1146
1147         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
1148                                      IEEE80211_CHAN_DISABLED) ||
1149             !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
1150                                      NL80211_IFTYPE_MESH_POINT)) {
1151                 sdata_info(sdata,
1152                            "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1153                            sdata->vif.addr,
1154                            params.chandef.chan->center_freq,
1155                            params.chandef.width,
1156                            params.chandef.center_freq1,
1157                            params.chandef.center_freq2);
1158                 return false;
1159         }
1160
1161         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1162                                             &params.chandef,
1163                                             NL80211_IFTYPE_MESH_POINT);
1164         if (err < 0)
1165                 return false;
1166         if (err > 0 && !ifmsh->userspace_handles_dfs) {
1167                 sdata_info(sdata,
1168                            "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1169                            sdata->vif.addr,
1170                            params.chandef.chan->center_freq,
1171                            params.chandef.width,
1172                            params.chandef.center_freq1,
1173                            params.chandef.center_freq2);
1174                 return false;
1175         }
1176
1177         params.radar_required = err;
1178
1179         if (cfg80211_chandef_identical(&params.chandef,
1180                                        &sdata->vif.bss_conf.chandef)) {
1181                 mcsa_dbg(sdata,
1182                          "received csa with an identical chandef, ignoring\n");
1183                 return true;
1184         }
1185
1186         mcsa_dbg(sdata,
1187                  "received channel switch announcement to go to channel %d MHz\n",
1188                  params.chandef.chan->center_freq);
1189
1190         params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1191         if (beacon) {
1192                 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1193                 if (ifmsh->pre_value >= csa_ie.pre_value)
1194                         return false;
1195                 ifmsh->pre_value = csa_ie.pre_value;
1196         }
1197
1198         if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1199                 return false;
1200
1201         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1202
1203         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1204                                      &params) < 0)
1205                 return false;
1206
1207         return true;
1208 }
1209
1210 static void
1211 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1212                             struct ieee80211_mgmt *mgmt, size_t len)
1213 {
1214         struct ieee80211_local *local = sdata->local;
1215         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1216         struct sk_buff *presp;
1217         struct beacon_data *bcn;
1218         struct ieee80211_mgmt *hdr;
1219         struct ieee802_11_elems elems;
1220         size_t baselen;
1221         u8 *pos;
1222
1223         pos = mgmt->u.probe_req.variable;
1224         baselen = (u8 *) pos - (u8 *) mgmt;
1225         if (baselen > len)
1226                 return;
1227
1228         ieee802_11_parse_elems(pos, len - baselen, false, &elems, mgmt->bssid,
1229                                NULL);
1230
1231         if (!elems.mesh_id)
1232                 return;
1233
1234         /* 802.11-2012 10.1.4.3.2 */
1235         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1236              !is_broadcast_ether_addr(mgmt->da)) ||
1237             elems.ssid_len != 0)
1238                 return;
1239
1240         if (elems.mesh_id_len != 0 &&
1241             (elems.mesh_id_len != ifmsh->mesh_id_len ||
1242              memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1243                 return;
1244
1245         rcu_read_lock();
1246         bcn = rcu_dereference(ifmsh->beacon);
1247
1248         if (!bcn)
1249                 goto out;
1250
1251         presp = dev_alloc_skb(local->tx_headroom +
1252                               bcn->head_len + bcn->tail_len);
1253         if (!presp)
1254                 goto out;
1255
1256         skb_reserve(presp, local->tx_headroom);
1257         skb_put_data(presp, bcn->head, bcn->head_len);
1258         skb_put_data(presp, bcn->tail, bcn->tail_len);
1259         hdr = (struct ieee80211_mgmt *) presp->data;
1260         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1261                                          IEEE80211_STYPE_PROBE_RESP);
1262         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1263         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1264         ieee80211_tx_skb(sdata, presp);
1265 out:
1266         rcu_read_unlock();
1267 }
1268
1269 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1270                                         u16 stype,
1271                                         struct ieee80211_mgmt *mgmt,
1272                                         size_t len,
1273                                         struct ieee80211_rx_status *rx_status)
1274 {
1275         struct ieee80211_local *local = sdata->local;
1276         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1277         struct ieee802_11_elems elems;
1278         struct ieee80211_channel *channel;
1279         size_t baselen;
1280         int freq;
1281         enum nl80211_band band = rx_status->band;
1282
1283         /* ignore ProbeResp to foreign address */
1284         if (stype == IEEE80211_STYPE_PROBE_RESP &&
1285             !ether_addr_equal(mgmt->da, sdata->vif.addr))
1286                 return;
1287
1288         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1289         if (baselen > len)
1290                 return;
1291
1292         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1293                                false, &elems, mgmt->bssid, NULL);
1294
1295         /* ignore non-mesh or secure / unsecure mismatch */
1296         if ((!elems.mesh_id || !elems.mesh_config) ||
1297             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1298             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1299                 return;
1300
1301         if (elems.ds_params)
1302                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1303         else
1304                 freq = rx_status->freq;
1305
1306         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1307
1308         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1309                 return;
1310
1311         if (mesh_matches_local(sdata, &elems)) {
1312                 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1313                         sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1314                 if (!sdata->u.mesh.user_mpm ||
1315                     sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1316                     sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1317                         mesh_neighbour_update(sdata, mgmt->sa, &elems,
1318                                               rx_status);
1319
1320                 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1321                     !sdata->vif.csa_active)
1322                         ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1323         }
1324
1325         if (ifmsh->sync_ops)
1326                 ifmsh->sync_ops->rx_bcn_presp(sdata,
1327                         stype, mgmt, &elems, rx_status);
1328 }
1329
1330 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1331 {
1332         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1333         struct mesh_csa_settings *tmp_csa_settings;
1334         int ret = 0;
1335         int changed = 0;
1336
1337         /* Reset the TTL value and Initiator flag */
1338         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1339         ifmsh->chsw_ttl = 0;
1340
1341         /* Remove the CSA and MCSP elements from the beacon */
1342         tmp_csa_settings = rcu_dereference_protected(ifmsh->csa,
1343                                             lockdep_is_held(&sdata->wdev.mtx));
1344         RCU_INIT_POINTER(ifmsh->csa, NULL);
1345         if (tmp_csa_settings)
1346                 kfree_rcu(tmp_csa_settings, rcu_head);
1347         ret = ieee80211_mesh_rebuild_beacon(sdata);
1348         if (ret)
1349                 return -EINVAL;
1350
1351         changed |= BSS_CHANGED_BEACON;
1352
1353         mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1354                  sdata->vif.bss_conf.chandef.chan->center_freq);
1355         return changed;
1356 }
1357
1358 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1359                               struct cfg80211_csa_settings *csa_settings)
1360 {
1361         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1362         struct mesh_csa_settings *tmp_csa_settings;
1363         int ret = 0;
1364
1365         lockdep_assert_held(&sdata->wdev.mtx);
1366
1367         tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1368                                    GFP_ATOMIC);
1369         if (!tmp_csa_settings)
1370                 return -ENOMEM;
1371
1372         memcpy(&tmp_csa_settings->settings, csa_settings,
1373                sizeof(struct cfg80211_csa_settings));
1374
1375         rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1376
1377         ret = ieee80211_mesh_rebuild_beacon(sdata);
1378         if (ret) {
1379                 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1380                 RCU_INIT_POINTER(ifmsh->csa, NULL);
1381                 kfree_rcu(tmp_csa_settings, rcu_head);
1382                 return ret;
1383         }
1384
1385         return BSS_CHANGED_BEACON;
1386 }
1387
1388 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1389                                struct ieee80211_mgmt *mgmt, size_t len,
1390                                struct ieee802_11_elems *elems)
1391 {
1392         struct ieee80211_mgmt *mgmt_fwd;
1393         struct sk_buff *skb;
1394         struct ieee80211_local *local = sdata->local;
1395
1396         skb = dev_alloc_skb(local->tx_headroom + len);
1397         if (!skb)
1398                 return -ENOMEM;
1399         skb_reserve(skb, local->tx_headroom);
1400         mgmt_fwd = skb_put(skb, len);
1401
1402         elems->mesh_chansw_params_ie->mesh_ttl--;
1403         elems->mesh_chansw_params_ie->mesh_flags &=
1404                 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1405
1406         memcpy(mgmt_fwd, mgmt, len);
1407         eth_broadcast_addr(mgmt_fwd->da);
1408         memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1409         memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1410
1411         ieee80211_tx_skb(sdata, skb);
1412         return 0;
1413 }
1414
1415 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1416                               struct ieee80211_mgmt *mgmt, size_t len)
1417 {
1418         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1419         struct ieee802_11_elems elems;
1420         u16 pre_value;
1421         bool fwd_csa = true;
1422         size_t baselen;
1423         u8 *pos;
1424
1425         if (mgmt->u.action.u.measurement.action_code !=
1426             WLAN_ACTION_SPCT_CHL_SWITCH)
1427                 return;
1428
1429         pos = mgmt->u.action.u.chan_switch.variable;
1430         baselen = offsetof(struct ieee80211_mgmt,
1431                            u.action.u.chan_switch.variable);
1432         ieee802_11_parse_elems(pos, len - baselen, true, &elems,
1433                                mgmt->bssid, NULL);
1434
1435         if (!mesh_matches_local(sdata, &elems))
1436                 return;
1437
1438         ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1439         if (!--ifmsh->chsw_ttl)
1440                 fwd_csa = false;
1441
1442         pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1443         if (ifmsh->pre_value >= pre_value)
1444                 return;
1445
1446         ifmsh->pre_value = pre_value;
1447
1448         if (!sdata->vif.csa_active &&
1449             !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1450                 mcsa_dbg(sdata, "Failed to process CSA action frame");
1451                 return;
1452         }
1453
1454         /* forward or re-broadcast the CSA frame */
1455         if (fwd_csa) {
1456                 if (mesh_fwd_csa_frame(sdata, mgmt, len, &elems) < 0)
1457                         mcsa_dbg(sdata, "Failed to forward the CSA frame");
1458         }
1459 }
1460
1461 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1462                                           struct ieee80211_mgmt *mgmt,
1463                                           size_t len,
1464                                           struct ieee80211_rx_status *rx_status)
1465 {
1466         switch (mgmt->u.action.category) {
1467         case WLAN_CATEGORY_SELF_PROTECTED:
1468                 switch (mgmt->u.action.u.self_prot.action_code) {
1469                 case WLAN_SP_MESH_PEERING_OPEN:
1470                 case WLAN_SP_MESH_PEERING_CLOSE:
1471                 case WLAN_SP_MESH_PEERING_CONFIRM:
1472                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1473                         break;
1474                 }
1475                 break;
1476         case WLAN_CATEGORY_MESH_ACTION:
1477                 if (mesh_action_is_path_sel(mgmt))
1478                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1479                 break;
1480         case WLAN_CATEGORY_SPECTRUM_MGMT:
1481                 mesh_rx_csa_frame(sdata, mgmt, len);
1482                 break;
1483         }
1484 }
1485
1486 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1487                                    struct sk_buff *skb)
1488 {
1489         struct ieee80211_rx_status *rx_status;
1490         struct ieee80211_mgmt *mgmt;
1491         u16 stype;
1492
1493         sdata_lock(sdata);
1494
1495         /* mesh already went down */
1496         if (!sdata->u.mesh.mesh_id_len)
1497                 goto out;
1498
1499         rx_status = IEEE80211_SKB_RXCB(skb);
1500         mgmt = (struct ieee80211_mgmt *) skb->data;
1501         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1502
1503         switch (stype) {
1504         case IEEE80211_STYPE_PROBE_RESP:
1505         case IEEE80211_STYPE_BEACON:
1506                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1507                                             rx_status);
1508                 break;
1509         case IEEE80211_STYPE_PROBE_REQ:
1510                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1511                 break;
1512         case IEEE80211_STYPE_ACTION:
1513                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1514                 break;
1515         }
1516 out:
1517         sdata_unlock(sdata);
1518 }
1519
1520 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1521 {
1522         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1523         u32 bit, changed = 0;
1524
1525         for_each_set_bit(bit, &ifmsh->mbss_changed,
1526                          sizeof(changed) * BITS_PER_BYTE) {
1527                 clear_bit(bit, &ifmsh->mbss_changed);
1528                 changed |= BIT(bit);
1529         }
1530
1531         if (sdata->vif.bss_conf.enable_beacon &&
1532             (changed & (BSS_CHANGED_BEACON |
1533                         BSS_CHANGED_HT |
1534                         BSS_CHANGED_BASIC_RATES |
1535                         BSS_CHANGED_BEACON_INT)))
1536                 if (ieee80211_mesh_rebuild_beacon(sdata))
1537                         return;
1538
1539         ieee80211_bss_info_change_notify(sdata, changed);
1540 }
1541
1542 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1543 {
1544         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1545
1546         sdata_lock(sdata);
1547
1548         /* mesh already went down */
1549         if (!sdata->u.mesh.mesh_id_len)
1550                 goto out;
1551
1552         if (ifmsh->preq_queue_len &&
1553             time_after(jiffies,
1554                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1555                 mesh_path_start_discovery(sdata);
1556
1557         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1558                 ieee80211_mesh_housekeeping(sdata);
1559
1560         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1561                 ieee80211_mesh_rootpath(sdata);
1562
1563         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1564                 mesh_sync_adjust_tsf(sdata);
1565
1566         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1567                 mesh_bss_info_changed(sdata);
1568 out:
1569         sdata_unlock(sdata);
1570 }
1571
1572
1573 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1574 {
1575         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1576         static u8 zero_addr[ETH_ALEN] = {};
1577
1578         timer_setup(&ifmsh->housekeeping_timer,
1579                     ieee80211_mesh_housekeeping_timer, 0);
1580
1581         ifmsh->accepting_plinks = true;
1582         atomic_set(&ifmsh->mpaths, 0);
1583         mesh_rmc_init(sdata);
1584         ifmsh->last_preq = jiffies;
1585         ifmsh->next_perr = jiffies;
1586         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1587         /* Allocate all mesh structures when creating the first mesh interface. */
1588         if (!mesh_allocated)
1589                 ieee80211s_init();
1590
1591         mesh_pathtbl_init(sdata);
1592
1593         timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1594         timer_setup(&ifmsh->mesh_path_root_timer,
1595                     ieee80211_mesh_path_root_timer, 0);
1596         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1597         skb_queue_head_init(&ifmsh->ps.bc_buf);
1598         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1599         spin_lock_init(&ifmsh->sync_offset_lock);
1600         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1601
1602         sdata->vif.bss_conf.bssid = zero_addr;
1603 }
1604
1605 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1606 {
1607         mesh_rmc_free(sdata);
1608         mesh_pathtbl_unregister(sdata);
1609 }