net/mac80211/mesh.c

   1 /*
   2  * Copyright (c) 2008, 2009 open80211s Ltd.
   3  * Copyright (C) 2018 Intel Corporation
   4  * Authors:    Luis Carlos Cobo <luisca@cozybit.com>
   5  *             Javier Cardona <javier@cozybit.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/slab.h>
  13 #include <asm/unaligned.h>
  14 #include "ieee80211_i.h"
  15 #include "mesh.h"
  16 #include "driver-ops.h"
  17
  18 static int mesh_allocated;
  19 static struct kmem_cache *rm_cache;
  20
  21 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  22 {
  23         return (mgmt->u.action.u.mesh_action.action_code ==
  24                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
  25 }
  26
  27 void ieee80211s_init(void)
  28 {
  29         mesh_allocated = 1;
  30         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  31                                      0, 0, NULL);
  32 }
  33
  34 void ieee80211s_stop(void)
  35 {
  36         if (!mesh_allocated)
  37                 return;
  38         kmem_cache_destroy(rm_cache);
  39 }
  40
  41 static void ieee80211_mesh_housekeeping_timer(struct timer_list *t)
  42 {
  43         struct ieee80211_sub_if_data *sdata =
  44                 from_timer(sdata, t, u.mesh.housekeeping_timer);
  45         struct ieee80211_local *local = sdata->local;
  46         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  47
  48         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  49
  50         ieee80211_queue_work(&local->hw, &sdata->work);
  51 }
  52
  53 /**
  54  * mesh_matches_local - check if the config of a mesh point matches ours
  55  *
  56  * @sdata: local mesh subif
  57  * @ie: information elements of a management frame from the mesh peer
  58  *
  59  * This function checks if the mesh configuration of a mesh point matches the
  60  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  61  */
  62 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
  63                         struct ieee802_11_elems *ie)
  64 {
  65         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  66         u32 basic_rates = 0;
  67         struct cfg80211_chan_def sta_chan_def;
  68         struct ieee80211_supported_band *sband;
  69
  70         /*
  71          * As support for each feature is added, check for matching
  72          * - On mesh config capabilities
  73          *   - Power Save Support En
  74          *   - Sync support enabled
  75          *   - Sync support active
  76          *   - Sync support required from peer
  77          *   - MDA enabled
  78          * - Power management control on fc
  79          */
  80         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
  81              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  82              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  83              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  84              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  85              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  86              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  87                 return false;
  88
  89         sband = ieee80211_get_sband(sdata);
  90         if (!sband)
  91                 return false;
  92
  93         ieee80211_sta_get_rates(sdata, ie, sband->band,
  94                                 &basic_rates);
  95
  96         if (sdata->vif.bss_conf.basic_rates != basic_rates)
  97                 return false;
  98
  99         cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
 100                                 NL80211_CHAN_NO_HT);
 101         ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
 102         ieee80211_chandef_vht_oper(&sdata->local->hw,
 103                                    ie->vht_operation, ie->ht_operation,
 104                                    &sta_chan_def);
 105
 106         if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
 107                                          &sta_chan_def))
 108                 return false;
 109
 110         return true;
 111 }
 112
 113 /**
 114  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 115  *
 116  * @ie: information elements of a management frame from the mesh peer
 117  */
 118 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 119 {
 120         return (ie->mesh_config->meshconf_cap &
 121                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 122 }
 123
 124 /**
 125  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
 126  *
 127  * @sdata: mesh interface in which mesh beacons are going to be updated
 128  *
 129  * Returns: beacon changed flag if the beacon content changed.
 130  */
 131 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 132 {
 133         bool free_plinks;
 134         u32 changed = 0;
 135
 136         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 137          * the mesh interface might be able to establish plinks with peers that
 138          * are already on the table but are not on PLINK_ESTAB state. However,
 139          * in general the mesh interface is not accepting peer link requests
 140          * from new peers, and that must be reflected in the beacon
 141          */
 142         free_plinks = mesh_plink_availables(sdata);
 143
 144         if (free_plinks != sdata->u.mesh.accepting_plinks) {
 145                 sdata->u.mesh.accepting_plinks = free_plinks;
 146                 changed = BSS_CHANGED_BEACON;
 147         }
 148
 149         return changed;
 150 }
 151
 152 /*
 153  * mesh_sta_cleanup - clean up any mesh sta state
 154  *
 155  * @sta: mesh sta to clean up.
 156  */
 157 void mesh_sta_cleanup(struct sta_info *sta)
 158 {
 159         struct ieee80211_sub_if_data *sdata = sta->sdata;
 160         u32 changed = mesh_plink_deactivate(sta);
 161
 162         if (changed)
 163                 ieee80211_mbss_info_change_notify(sdata, changed);
 164 }
 165
 166 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 167 {
 168         int i;
 169
 170         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 171         if (!sdata->u.mesh.rmc)
 172                 return -ENOMEM;
 173         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 174         for (i = 0; i < RMC_BUCKETS; i++)
 175                 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
 176         return 0;
 177 }
 178
 179 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 180 {
 181         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 182         struct rmc_entry *p;
 183         struct hlist_node *n;
 184         int i;
 185
 186         if (!sdata->u.mesh.rmc)
 187                 return;
 188
 189         for (i = 0; i < RMC_BUCKETS; i++) {
 190                 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 191                         hlist_del(&p->list);
 192                         kmem_cache_free(rm_cache, p);
 193                 }
 194         }
 195
 196         kfree(rmc);
 197         sdata->u.mesh.rmc = NULL;
 198 }
 199
 200 /**
 201  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 202  *
 203  * @sdata:      interface
 204  * @sa:         source address
 205  * @mesh_hdr:   mesh_header
 206  *
 207  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 208  *
 209  * Checks using the source address and the mesh sequence number if we have
 210  * received this frame lately. If the frame is not in the cache, it is added to
 211  * it.
 212  */
 213 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
 214                    const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
 215 {
 216         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 217         u32 seqnum = 0;
 218         int entries = 0;
 219         u8 idx;
 220         struct rmc_entry *p;
 221         struct hlist_node *n;
 222
 223         if (!rmc)
 224                 return -1;
 225
 226         /* Don't care about endianness since only match matters */
 227         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 228         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 229         hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 230                 ++entries;
 231                 if (time_after(jiffies, p->exp_time) ||
 232                     entries == RMC_QUEUE_MAX_LEN) {
 233                         hlist_del(&p->list);
 234                         kmem_cache_free(rm_cache, p);
 235                         --entries;
 236                 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
 237                         return -1;
 238         }
 239
 240         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 241         if (!p)
 242                 return 0;
 243
 244         p->seqnum = seqnum;
 245         p->exp_time = jiffies + RMC_TIMEOUT;
 246         memcpy(p->sa, sa, ETH_ALEN);
 247         hlist_add_head(&p->list, &rmc->bucket[idx]);
 248         return 0;
 249 }
 250
 251 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
 252                          struct sk_buff *skb)
 253 {
 254         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 255         u8 *pos, neighbors;
 256         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 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;
 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 static void ieee80211_mesh_path_timer(struct timer_list *t)
 536 {
 537         struct ieee80211_sub_if_data *sdata =
 538                 from_timer(sdata, t, u.mesh.mesh_path_timer);
 539
 540         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 541 }
 542
 543 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
 544 {
 545         struct ieee80211_sub_if_data *sdata =
 546                 from_timer(sdata, t, u.mesh.mesh_path_root_timer);
 547         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 548
 549         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 550
 551         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 552 }
 553
 554 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 555 {
 556         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 557                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 558         else {
 559                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 560                 /* stop running timer */
 561                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 562         }
 563 }
 564
 565 /**
 566  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 567  * @hdr:        802.11 frame header
 568  * @fc:         frame control field
 569  * @meshda:     destination address in the mesh
 570  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 571  *              locally originated.
 572  *
 573  * Return the length of the 802.11 (does not include a mesh control header)
 574  */
 575 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 576                                   const u8 *meshda, const u8 *meshsa)
 577 {
 578         if (is_multicast_ether_addr(meshda)) {
 579                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 580                 /* DA TA SA */
 581                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 582                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 583                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 584                 return 24;
 585         } else {
 586                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 587                 /* RA TA DA SA */
 588                 eth_zero_addr(hdr->addr1);   /* RA is resolved later */
 589                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 590                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 591                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 592                 return 30;
 593         }
 594 }
 595
 596 /**
 597  * ieee80211_new_mesh_header - create a new mesh header
 598  * @sdata:      mesh interface to be used
 599  * @meshhdr:    uninitialized mesh header
 600  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 601  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 602  *              be NULL.
 603  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 604  *              mesh frame
 605  *
 606  * Return the header length.
 607  */
 608 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 609                                        struct ieee80211s_hdr *meshhdr,
 610                                        const char *addr4or5, const char *addr6)
 611 {
 612         if (WARN_ON(!addr4or5 && addr6))
 613                 return 0;
 614
 615         memset(meshhdr, 0, sizeof(*meshhdr));
 616
 617         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 618
 619         /* FIXME: racy -- TX on multiple queues can be concurrent */
 620         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 621         sdata->u.mesh.mesh_seqnum++;
 622
 623         if (addr4or5 && !addr6) {
 624                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 625                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 626                 return 2 * ETH_ALEN;
 627         } else if (addr4or5 && addr6) {
 628                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 629                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 630                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 631                 return 3 * ETH_ALEN;
 632         }
 633
 634         return ETH_ALEN;
 635 }
 636
 637 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 638 {
 639         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 640         u32 changed;
 641
 642         if (ifmsh->mshcfg.plink_timeout > 0)
 643                 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
 644         mesh_path_expire(sdata);
 645
 646         changed = mesh_accept_plinks_update(sdata);
 647         ieee80211_mbss_info_change_notify(sdata, changed);
 648
 649         mod_timer(&ifmsh->housekeeping_timer,
 650                   round_jiffies(jiffies +
 651                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 652 }
 653
 654 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 655 {
 656         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 657         u32 interval;
 658
 659         mesh_path_tx_root_frame(sdata);
 660
 661         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 662                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 663         else
 664                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 665
 666         mod_timer(&ifmsh->mesh_path_root_timer,
 667                   round_jiffies(TU_TO_EXP_TIME(interval)));
 668 }
 669
 670 static int
 671 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 672 {
 673         struct beacon_data *bcn;
 674         int head_len, tail_len;
 675         struct sk_buff *skb;
 676         struct ieee80211_mgmt *mgmt;
 677         struct ieee80211_chanctx_conf *chanctx_conf;
 678         struct mesh_csa_settings *csa;
 679         enum nl80211_band band;
 680         u8 *pos;
 681         struct ieee80211_sub_if_data *sdata;
 682         int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
 683
 684         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 685         rcu_read_lock();
 686         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 687         band = chanctx_conf->def.chan->band;
 688         rcu_read_unlock();
 689
 690         head_len = hdr_len +
 691                    2 + /* NULL SSID */
 692                    /* Channel Switch Announcement */
 693                    2 + sizeof(struct ieee80211_channel_sw_ie) +
 694                    /* Mesh Channel Switch Parameters */
 695                    2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
 696                    /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
 697                    2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
 698                    2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
 699                    2 + 8 + /* supported rates */
 700                    2 + 3; /* DS params */
 701         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 702                    2 + sizeof(struct ieee80211_ht_cap) +
 703                    2 + sizeof(struct ieee80211_ht_operation) +
 704                    2 + ifmsh->mesh_id_len +
 705                    2 + sizeof(struct ieee80211_meshconf_ie) +
 706                    2 + sizeof(__le16) + /* awake window */
 707                    2 + sizeof(struct ieee80211_vht_cap) +
 708                    2 + sizeof(struct ieee80211_vht_operation) +
 709                    ifmsh->ie_len;
 710
 711         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
 712         /* need an skb for IE builders to operate on */
 713         skb = dev_alloc_skb(max(head_len, tail_len));
 714
 715         if (!bcn || !skb)
 716                 goto out_free;
 717
 718         /*
 719          * pointers go into the block we allocated,
 720          * memory is | beacon_data | head | tail |
 721          */
 722         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
 723
 724         /* fill in the head */
 725         mgmt = skb_put_zero(skb, hdr_len);
 726         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 727                                           IEEE80211_STYPE_BEACON);
 728         eth_broadcast_addr(mgmt->da);
 729         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 730         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 731         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
 732         mgmt->u.beacon.beacon_int =
 733                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
 734         mgmt->u.beacon.capab_info |= cpu_to_le16(
 735                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
 736
 737         pos = skb_put(skb, 2);
 738         *pos++ = WLAN_EID_SSID;
 739         *pos++ = 0x0;
 740
 741         rcu_read_lock();
 742         csa = rcu_dereference(ifmsh->csa);
 743         if (csa) {
 744                 enum nl80211_channel_type ct;
 745                 struct cfg80211_chan_def *chandef;
 746                 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
 747                              2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
 748
 749                 pos = skb_put_zero(skb, ie_len);
 750                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 751                 *pos++ = 3;
 752                 *pos++ = 0x0;
 753                 *pos++ = ieee80211_frequency_to_channel(
 754                                 csa->settings.chandef.chan->center_freq);
 755                 bcn->csa_current_counter = csa->settings.count;
 756                 bcn->csa_counter_offsets[0] = hdr_len + 6;
 757                 *pos++ = csa->settings.count;
 758                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
 759                 *pos++ = 6;
 760                 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
 761                         *pos++ = ifmsh->mshcfg.dot11MeshTTL;
 762                         *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
 763                 } else {
 764                         *pos++ = ifmsh->chsw_ttl;
 765                 }
 766                 *pos++ |= csa->settings.block_tx ?
 767                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
 768                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
 769                 pos += 2;
 770                 put_unaligned_le16(ifmsh->pre_value, pos);
 771                 pos += 2;
 772
 773                 switch (csa->settings.chandef.width) {
 774                 case NL80211_CHAN_WIDTH_40:
 775                         ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
 776                         pos = skb_put_zero(skb, ie_len);
 777
 778                         *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
 779                         *pos++ = 1;                                 /* len */
 780                         ct = cfg80211_get_chandef_type(&csa->settings.chandef);
 781                         if (ct == NL80211_CHAN_HT40PLUS)
 782                                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 783                         else
 784                                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 785                         break;
 786                 case NL80211_CHAN_WIDTH_80:
 787                 case NL80211_CHAN_WIDTH_80P80:
 788                 case NL80211_CHAN_WIDTH_160:
 789                         /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
 790                         ie_len = 2 + 2 +
 791                                  sizeof(struct ieee80211_wide_bw_chansw_ie);
 792                         pos = skb_put_zero(skb, ie_len);
 793
 794                         *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
 795                         *pos++ = 5;                               /* len */
 796                         /* put sub IE */
 797                         chandef = &csa->settings.chandef;
 798                         ieee80211_ie_build_wide_bw_cs(pos, chandef);
 799                         break;
 800                 default:
 801                         break;
 802                 }
 803         }
 804         rcu_read_unlock();
 805
 806         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
 807             mesh_add_ds_params_ie(sdata, skb))
 808                 goto out_free;
 809
 810         bcn->head_len = skb->len;
 811         memcpy(bcn->head, skb->data, bcn->head_len);
 812
 813         /* now the tail */
 814         skb_trim(skb, 0);
 815         bcn->tail = bcn->head + bcn->head_len;
 816
 817         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
 818             mesh_add_rsn_ie(sdata, skb) ||
 819             mesh_add_ht_cap_ie(sdata, skb) ||
 820             mesh_add_ht_oper_ie(sdata, skb) ||
 821             mesh_add_meshid_ie(sdata, skb) ||
 822             mesh_add_meshconf_ie(sdata, skb) ||
 823             mesh_add_awake_window_ie(sdata, skb) ||
 824             mesh_add_vht_cap_ie(sdata, skb) ||
 825             mesh_add_vht_oper_ie(sdata, skb) ||
 826             mesh_add_vendor_ies(sdata, skb))
 827                 goto out_free;
 828
 829         bcn->tail_len = skb->len;
 830         memcpy(bcn->tail, skb->data, bcn->tail_len);
 831         bcn->meshconf = (struct ieee80211_meshconf_ie *)
 832                                         (bcn->tail + ifmsh->meshconf_offset);
 833
 834         dev_kfree_skb(skb);
 835         rcu_assign_pointer(ifmsh->beacon, bcn);
 836         return 0;
 837 out_free:
 838         kfree(bcn);
 839         dev_kfree_skb(skb);
 840         return -ENOMEM;
 841 }
 842
 843 static int
 844 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
 845 {
 846         struct beacon_data *old_bcn;
 847         int ret;
 848
 849         old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
 850                                             lockdep_is_held(&sdata->wdev.mtx));
 851         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
 852         if (ret)
 853                 /* just reuse old beacon */
 854                 return ret;
 855
 856         if (old_bcn)
 857                 kfree_rcu(old_bcn, rcu_head);
 858         return 0;
 859 }
 860
 861 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 862                                        u32 changed)
 863 {
 864         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 865         unsigned long bits = changed;
 866         u32 bit;
 867
 868         if (!bits)
 869                 return;
 870
 871         /* if we race with running work, worst case this work becomes a noop */
 872         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
 873                 set_bit(bit, &ifmsh->mbss_changed);
 874         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
 875         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 876 }
 877
 878 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 879 {
 880         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 881         struct ieee80211_local *local = sdata->local;
 882         u32 changed = BSS_CHANGED_BEACON |
 883                       BSS_CHANGED_BEACON_ENABLED |
 884                       BSS_CHANGED_HT |
 885                       BSS_CHANGED_BASIC_RATES |
 886                       BSS_CHANGED_BEACON_INT |
 887                       BSS_CHANGED_MCAST_RATE;
 888
 889         local->fif_other_bss++;
 890         /* mesh ifaces must set allmulti to forward mcast traffic */
 891         atomic_inc(&local->iff_allmultis);
 892         ieee80211_configure_filter(local);
 893
 894         ifmsh->mesh_cc_id = 0;  /* Disabled */
 895         /* register sync ops from extensible synchronization framework */
 896         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 897         ifmsh->sync_offset_clockdrift_max = 0;
 898         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 899         ieee80211_mesh_root_setup(ifmsh);
 900         ieee80211_queue_work(&local->hw, &sdata->work);
 901         sdata->vif.bss_conf.ht_operation_mode =
 902                                 ifmsh->mshcfg.ht_opmode;
 903         sdata->vif.bss_conf.enable_beacon = true;
 904
 905         changed |= ieee80211_mps_local_status_update(sdata);
 906
 907         if (ieee80211_mesh_build_beacon(ifmsh)) {
 908                 ieee80211_stop_mesh(sdata);
 909                 return -ENOMEM;
 910         }
 911
 912         ieee80211_recalc_dtim(local, sdata);
 913         ieee80211_bss_info_change_notify(sdata, changed);
 914
 915         netif_carrier_on(sdata->dev);
 916         return 0;
 917 }
 918
 919 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 920 {
 921         struct ieee80211_local *local = sdata->local;
 922         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 923         struct beacon_data *bcn;
 924
 925         netif_carrier_off(sdata->dev);
 926
 927         /* flush STAs and mpaths on this iface */
 928         sta_info_flush(sdata);
 929         mesh_path_flush_by_iface(sdata);
 930
 931         /* stop the beacon */
 932         ifmsh->mesh_id_len = 0;
 933         sdata->vif.bss_conf.enable_beacon = false;
 934         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 935         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 936
 937         /* remove beacon */
 938         bcn = rcu_dereference_protected(ifmsh->beacon,
 939                                         lockdep_is_held(&sdata->wdev.mtx));
 940         RCU_INIT_POINTER(ifmsh->beacon, NULL);
 941         kfree_rcu(bcn, rcu_head);
 942
 943         /* free all potentially still buffered group-addressed frames */
 944         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
 945         skb_queue_purge(&ifmsh->ps.bc_buf);
 946
 947         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 948         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 949         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 950
 951         /* clear any mesh work (for next join) we may have accrued */
 952         ifmsh->wrkq_flags = 0;
 953         ifmsh->mbss_changed = 0;
 954
 955         local->fif_other_bss--;
 956         atomic_dec(&local->iff_allmultis);
 957         ieee80211_configure_filter(local);
 958 }
 959
 960 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 961 {
 962         int err;
 963
 964         /* if the current channel is a DFS channel, mark the channel as
 965          * unavailable.
 966          */
 967         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 968                                             &sdata->vif.bss_conf.chandef,
 969                                             NL80211_IFTYPE_MESH_POINT);
 970         if (err > 0)
 971                 cfg80211_radar_event(sdata->local->hw.wiphy,
 972                                      &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
 973 }
 974
 975 static bool
 976 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
 977                                  struct ieee802_11_elems *elems, bool beacon)
 978 {
 979         struct cfg80211_csa_settings params;
 980         struct ieee80211_csa_ie csa_ie;
 981         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 982         struct ieee80211_supported_band *sband;
 983         int err;
 984         u32 sta_flags;
 985
 986         sdata_assert_lock(sdata);
 987
 988         sband = ieee80211_get_sband(sdata);
 989         if (!sband)
 990                 return false;
 991
 992         sta_flags = 0;
 993         switch (sdata->vif.bss_conf.chandef.width) {
 994         case NL80211_CHAN_WIDTH_20_NOHT:
 995                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 996                 /* fall through */
 997         case NL80211_CHAN_WIDTH_20:
 998                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 999                 /* fall through */
1000         case NL80211_CHAN_WIDTH_40:
1001                 sta_flags |= IEEE80211_STA_DISABLE_VHT;
1002                 break;
1003         default:
1004                 break;
1005         }
1006
1007         memset(&params, 0, sizeof(params));
1008         err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1009                                            sta_flags, sdata->vif.addr,
1010                                            &csa_ie);
1011         if (err < 0)
1012                 return false;
1013         if (err)
1014                 return false;
1015
1016         /* Mark the channel unavailable if the reason for the switch is
1017          * regulatory.
1018          */
1019         if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1020                 ieee80211_mesh_csa_mark_radar(sdata);
1021
1022         params.chandef = csa_ie.chandef;
1023         params.count = csa_ie.count;
1024
1025         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
1026                                      IEEE80211_CHAN_DISABLED) ||
1027             !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
1028                                      NL80211_IFTYPE_MESH_POINT)) {
1029                 sdata_info(sdata,
1030                            "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1031                            sdata->vif.addr,
1032                            params.chandef.chan->center_freq,
1033                            params.chandef.width,
1034                            params.chandef.center_freq1,
1035                            params.chandef.center_freq2);
1036                 return false;
1037         }
1038
1039         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1040                                             &params.chandef,
1041                                             NL80211_IFTYPE_MESH_POINT);
1042         if (err < 0)
1043                 return false;
1044         if (err > 0 && !ifmsh->userspace_handles_dfs) {
1045                 sdata_info(sdata,
1046                            "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1047                            sdata->vif.addr,
1048                            params.chandef.chan->center_freq,
1049                            params.chandef.width,
1050                            params.chandef.center_freq1,
1051                            params.chandef.center_freq2);
1052                 return false;
1053         }
1054
1055         params.radar_required = err;
1056
1057         if (cfg80211_chandef_identical(&params.chandef,
1058                                        &sdata->vif.bss_conf.chandef)) {
1059                 mcsa_dbg(sdata,
1060                          "received csa with an identical chandef, ignoring\n");
1061                 return true;
1062         }
1063
1064         mcsa_dbg(sdata,
1065                  "received channel switch announcement to go to channel %d MHz\n",
1066                  params.chandef.chan->center_freq);
1067
1068         params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1069         if (beacon) {
1070                 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1071                 if (ifmsh->pre_value >= csa_ie.pre_value)
1072                         return false;
1073                 ifmsh->pre_value = csa_ie.pre_value;
1074         }
1075
1076         if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1077                 return false;
1078
1079         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1080
1081         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1082                                      &params) < 0)
1083                 return false;
1084
1085         return true;
1086 }
1087
1088 static void
1089 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1090                             struct ieee80211_mgmt *mgmt, size_t len)
1091 {
1092         struct ieee80211_local *local = sdata->local;
1093         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1094         struct sk_buff *presp;
1095         struct beacon_data *bcn;
1096         struct ieee80211_mgmt *hdr;
1097         struct ieee802_11_elems elems;
1098         size_t baselen;
1099         u8 *pos;
1100
1101         pos = mgmt->u.probe_req.variable;
1102         baselen = (u8 *) pos - (u8 *) mgmt;
1103         if (baselen > len)
1104                 return;
1105
1106         ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1107
1108         if (!elems.mesh_id)
1109                 return;
1110
1111         /* 802.11-2012 10.1.4.3.2 */
1112         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1113              !is_broadcast_ether_addr(mgmt->da)) ||
1114             elems.ssid_len != 0)
1115                 return;
1116
1117         if (elems.mesh_id_len != 0 &&
1118             (elems.mesh_id_len != ifmsh->mesh_id_len ||
1119              memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1120                 return;
1121
1122         rcu_read_lock();
1123         bcn = rcu_dereference(ifmsh->beacon);
1124
1125         if (!bcn)
1126                 goto out;
1127
1128         presp = dev_alloc_skb(local->tx_headroom +
1129                               bcn->head_len + bcn->tail_len);
1130         if (!presp)
1131                 goto out;
1132
1133         skb_reserve(presp, local->tx_headroom);
1134         skb_put_data(presp, bcn->head, bcn->head_len);
1135         skb_put_data(presp, bcn->tail, bcn->tail_len);
1136         hdr = (struct ieee80211_mgmt *) presp->data;
1137         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1138                                          IEEE80211_STYPE_PROBE_RESP);
1139         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1140         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1141         ieee80211_tx_skb(sdata, presp);
1142 out:
1143         rcu_read_unlock();
1144 }
1145
1146 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1147                                         u16 stype,
1148                                         struct ieee80211_mgmt *mgmt,
1149                                         size_t len,
1150                                         struct ieee80211_rx_status *rx_status)
1151 {
1152         struct ieee80211_local *local = sdata->local;
1153         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1154         struct ieee802_11_elems elems;
1155         struct ieee80211_channel *channel;
1156         size_t baselen;
1157         int freq;
1158         enum nl80211_band band = rx_status->band;
1159
1160         /* ignore ProbeResp to foreign address */
1161         if (stype == IEEE80211_STYPE_PROBE_RESP &&
1162             !ether_addr_equal(mgmt->da, sdata->vif.addr))
1163                 return;
1164
1165         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1166         if (baselen > len)
1167                 return;
1168
1169         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1170                                false, &elems);
1171
1172         /* ignore non-mesh or secure / unsecure mismatch */
1173         if ((!elems.mesh_id || !elems.mesh_config) ||
1174             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1175             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1176                 return;
1177
1178         if (elems.ds_params)
1179                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1180         else
1181                 freq = rx_status->freq;
1182
1183         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1184
1185         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1186                 return;
1187
1188         if (mesh_matches_local(sdata, &elems)) {
1189                 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1190                         sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1191                 if (!sdata->u.mesh.user_mpm ||
1192                     sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1193                     sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1194                         mesh_neighbour_update(sdata, mgmt->sa, &elems);
1195         }
1196
1197         if (ifmsh->sync_ops)
1198                 ifmsh->sync_ops->rx_bcn_presp(sdata,
1199                         stype, mgmt, &elems, rx_status);
1200
1201         if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1202             !sdata->vif.csa_active)
1203                 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1204 }
1205
1206 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1207 {
1208         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1209         struct mesh_csa_settings *tmp_csa_settings;
1210         int ret = 0;
1211         int changed = 0;
1212
1213         /* Reset the TTL value and Initiator flag */
1214         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1215         ifmsh->chsw_ttl = 0;
1216
1217         /* Remove the CSA and MCSP elements from the beacon */
1218         tmp_csa_settings = rcu_dereference(ifmsh->csa);
1219         RCU_INIT_POINTER(ifmsh->csa, NULL);
1220         if (tmp_csa_settings)
1221                 kfree_rcu(tmp_csa_settings, rcu_head);
1222         ret = ieee80211_mesh_rebuild_beacon(sdata);
1223         if (ret)
1224                 return -EINVAL;
1225
1226         changed |= BSS_CHANGED_BEACON;
1227
1228         mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1229                  sdata->vif.bss_conf.chandef.chan->center_freq);
1230         return changed;
1231 }
1232
1233 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1234                               struct cfg80211_csa_settings *csa_settings)
1235 {
1236         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1237         struct mesh_csa_settings *tmp_csa_settings;
1238         int ret = 0;
1239
1240         tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1241                                    GFP_ATOMIC);
1242         if (!tmp_csa_settings)
1243                 return -ENOMEM;
1244
1245         memcpy(&tmp_csa_settings->settings, csa_settings,
1246                sizeof(struct cfg80211_csa_settings));
1247
1248         rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1249
1250         ret = ieee80211_mesh_rebuild_beacon(sdata);
1251         if (ret) {
1252                 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1253                 RCU_INIT_POINTER(ifmsh->csa, NULL);
1254                 kfree_rcu(tmp_csa_settings, rcu_head);
1255                 return ret;
1256         }
1257
1258         return BSS_CHANGED_BEACON;
1259 }
1260
1261 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1262                                struct ieee80211_mgmt *mgmt, size_t len,
1263                                struct ieee802_11_elems *elems)
1264 {
1265         struct ieee80211_mgmt *mgmt_fwd;
1266         struct sk_buff *skb;
1267         struct ieee80211_local *local = sdata->local;
1268
1269         skb = dev_alloc_skb(local->tx_headroom + len);
1270         if (!skb)
1271                 return -ENOMEM;
1272         skb_reserve(skb, local->tx_headroom);
1273         mgmt_fwd = skb_put(skb, len);
1274
1275         elems->mesh_chansw_params_ie->mesh_ttl--;
1276         elems->mesh_chansw_params_ie->mesh_flags &=
1277                 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1278
1279         memcpy(mgmt_fwd, mgmt, len);
1280         eth_broadcast_addr(mgmt_fwd->da);
1281         memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1282         memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1283
1284         ieee80211_tx_skb(sdata, skb);
1285         return 0;
1286 }
1287
1288 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1289                               struct ieee80211_mgmt *mgmt, size_t len)
1290 {
1291         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1292         struct ieee802_11_elems elems;
1293         u16 pre_value;
1294         bool fwd_csa = true;
1295         size_t baselen;
1296         u8 *pos;
1297
1298         if (mgmt->u.action.u.measurement.action_code !=
1299             WLAN_ACTION_SPCT_CHL_SWITCH)
1300                 return;
1301
1302         pos = mgmt->u.action.u.chan_switch.variable;
1303         baselen = offsetof(struct ieee80211_mgmt,
1304                            u.action.u.chan_switch.variable);
1305         ieee802_11_parse_elems(pos, len - baselen, true, &elems);
1306
1307         ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1308         if (!--ifmsh->chsw_ttl)
1309                 fwd_csa = false;
1310
1311         pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1312         if (ifmsh->pre_value >= pre_value)
1313                 return;
1314
1315         ifmsh->pre_value = pre_value;
1316
1317         if (!sdata->vif.csa_active &&
1318             !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1319                 mcsa_dbg(sdata, "Failed to process CSA action frame");
1320                 return;
1321         }
1322
1323         /* forward or re-broadcast the CSA frame */
1324         if (fwd_csa) {
1325                 if (mesh_fwd_csa_frame(sdata, mgmt, len, &elems) < 0)
1326                         mcsa_dbg(sdata, "Failed to forward the CSA frame");
1327         }
1328 }
1329
1330 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1331                                           struct ieee80211_mgmt *mgmt,
1332                                           size_t len,
1333                                           struct ieee80211_rx_status *rx_status)
1334 {
1335         switch (mgmt->u.action.category) {
1336         case WLAN_CATEGORY_SELF_PROTECTED:
1337                 switch (mgmt->u.action.u.self_prot.action_code) {
1338                 case WLAN_SP_MESH_PEERING_OPEN:
1339                 case WLAN_SP_MESH_PEERING_CLOSE:
1340                 case WLAN_SP_MESH_PEERING_CONFIRM:
1341                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1342                         break;
1343                 }
1344                 break;
1345         case WLAN_CATEGORY_MESH_ACTION:
1346                 if (mesh_action_is_path_sel(mgmt))
1347                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1348                 break;
1349         case WLAN_CATEGORY_SPECTRUM_MGMT:
1350                 mesh_rx_csa_frame(sdata, mgmt, len);
1351                 break;
1352         }
1353 }
1354
1355 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1356                                    struct sk_buff *skb)
1357 {
1358         struct ieee80211_rx_status *rx_status;
1359         struct ieee80211_mgmt *mgmt;
1360         u16 stype;
1361
1362         sdata_lock(sdata);
1363
1364         /* mesh already went down */
1365         if (!sdata->u.mesh.mesh_id_len)
1366                 goto out;
1367
1368         rx_status = IEEE80211_SKB_RXCB(skb);
1369         mgmt = (struct ieee80211_mgmt *) skb->data;
1370         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1371
1372         switch (stype) {
1373         case IEEE80211_STYPE_PROBE_RESP:
1374         case IEEE80211_STYPE_BEACON:
1375                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1376                                             rx_status);
1377                 break;
1378         case IEEE80211_STYPE_PROBE_REQ:
1379                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1380                 break;
1381         case IEEE80211_STYPE_ACTION:
1382                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1383                 break;
1384         }
1385 out:
1386         sdata_unlock(sdata);
1387 }
1388
1389 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1390 {
1391         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1392         u32 bit, changed = 0;
1393
1394         for_each_set_bit(bit, &ifmsh->mbss_changed,
1395                          sizeof(changed) * BITS_PER_BYTE) {
1396                 clear_bit(bit, &ifmsh->mbss_changed);
1397                 changed |= BIT(bit);
1398         }
1399
1400         if (sdata->vif.bss_conf.enable_beacon &&
1401             (changed & (BSS_CHANGED_BEACON |
1402                         BSS_CHANGED_HT |
1403                         BSS_CHANGED_BASIC_RATES |
1404                         BSS_CHANGED_BEACON_INT)))
1405                 if (ieee80211_mesh_rebuild_beacon(sdata))
1406                         return;
1407
1408         ieee80211_bss_info_change_notify(sdata, changed);
1409 }
1410
1411 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1412 {
1413         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1414
1415         sdata_lock(sdata);
1416
1417         /* mesh already went down */
1418         if (!sdata->u.mesh.mesh_id_len)
1419                 goto out;
1420
1421         if (ifmsh->preq_queue_len &&
1422             time_after(jiffies,
1423                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1424                 mesh_path_start_discovery(sdata);
1425
1426         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1427                 ieee80211_mesh_housekeeping(sdata);
1428
1429         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1430                 ieee80211_mesh_rootpath(sdata);
1431
1432         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1433                 mesh_sync_adjust_tsf(sdata);
1434
1435         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1436                 mesh_bss_info_changed(sdata);
1437 out:
1438         sdata_unlock(sdata);
1439 }
1440
1441
1442 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1443 {
1444         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1445         static u8 zero_addr[ETH_ALEN] = {};
1446
1447         timer_setup(&ifmsh->housekeeping_timer,
1448                     ieee80211_mesh_housekeeping_timer, 0);
1449
1450         ifmsh->accepting_plinks = true;
1451         atomic_set(&ifmsh->mpaths, 0);
1452         mesh_rmc_init(sdata);
1453         ifmsh->last_preq = jiffies;
1454         ifmsh->next_perr = jiffies;
1455         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1456         /* Allocate all mesh structures when creating the first mesh interface. */
1457         if (!mesh_allocated)
1458                 ieee80211s_init();
1459
1460         mesh_pathtbl_init(sdata);
1461
1462         timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1463         timer_setup(&ifmsh->mesh_path_root_timer,
1464                     ieee80211_mesh_path_root_timer, 0);
1465         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1466         skb_queue_head_init(&ifmsh->ps.bc_buf);
1467         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1468         spin_lock_init(&ifmsh->sync_offset_lock);
1469         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1470
1471         sdata->vif.bss_conf.bssid = zero_addr;
1472 }
1473
1474 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1475 {
1476         mesh_rmc_free(sdata);
1477         mesh_pathtbl_unregister(sdata);
1478 }