net/mac80211/mesh.c

   1 /*
   2  * Copyright (c) 2008, 2009 open80211s Ltd.
   3  * Authors:    Luis Carlos Cobo <luisca@cozybit.com>
   4  *             Javier Cardona <javier@cozybit.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/slab.h>
  12 #include <asm/unaligned.h>
  13 #include "ieee80211_i.h"
  14 #include "mesh.h"
  15 #include "driver-ops.h"
  16
  17 static int mesh_allocated;
  18 static struct kmem_cache *rm_cache;
  19
  20 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  21 {
  22         return (mgmt->u.action.u.mesh_action.action_code ==
  23                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
  24 }
  25
  26 void ieee80211s_init(void)
  27 {
  28         mesh_allocated = 1;
  29         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  30                                      0, 0, NULL);
  31 }
  32
  33 void ieee80211s_stop(void)
  34 {
  35         if (!mesh_allocated)
  36                 return;
  37         kmem_cache_destroy(rm_cache);
  38 }
  39
  40 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  41 {
  42         struct ieee80211_sub_if_data *sdata = (void *) data;
  43         struct ieee80211_local *local = sdata->local;
  44         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  45
  46         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  47
  48         ieee80211_queue_work(&local->hw, &sdata->work);
  49 }
  50
  51 /**
  52  * mesh_matches_local - check if the config of a mesh point matches ours
  53  *
  54  * @sdata: local mesh subif
  55  * @ie: information elements of a management frame from the mesh peer
  56  *
  57  * This function checks if the mesh configuration of a mesh point matches the
  58  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  59  */
  60 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
  61                         struct ieee802_11_elems *ie)
  62 {
  63         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  64         u32 basic_rates = 0;
  65         struct cfg80211_chan_def sta_chan_def;
  66
  67         /*
  68          * As support for each feature is added, check for matching
  69          * - On mesh config capabilities
  70          *   - Power Save Support En
  71          *   - Sync support enabled
  72          *   - Sync support active
  73          *   - Sync support required from peer
  74          *   - MDA enabled
  75          * - Power management control on fc
  76          */
  77         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
  78              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  79              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  80              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  81              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  82              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  83              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  84                 return false;
  85
  86         ieee80211_sta_get_rates(sdata, ie, ieee80211_get_sdata_band(sdata),
  87                                 &basic_rates);
  88
  89         if (sdata->vif.bss_conf.basic_rates != basic_rates)
  90                 return false;
  91
  92         cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
  93                                 NL80211_CHAN_NO_HT);
  94         ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
  95         ieee80211_chandef_vht_oper(ie->vht_operation, &sta_chan_def);
  96
  97         if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
  98                                          &sta_chan_def))
  99                 return false;
 100
 101         return true;
 102 }
 103
 104 /**
 105  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 106  *
 107  * @ie: information elements of a management frame from the mesh peer
 108  */
 109 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 110 {
 111         return (ie->mesh_config->meshconf_cap &
 112                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 113 }
 114
 115 /**
 116  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
 117  *
 118  * @sdata: mesh interface in which mesh beacons are going to be updated
 119  *
 120  * Returns: beacon changed flag if the beacon content changed.
 121  */
 122 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 123 {
 124         bool free_plinks;
 125         u32 changed = 0;
 126
 127         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 128          * the mesh interface might be able to establish plinks with peers that
 129          * are already on the table but are not on PLINK_ESTAB state. However,
 130          * in general the mesh interface is not accepting peer link requests
 131          * from new peers, and that must be reflected in the beacon
 132          */
 133         free_plinks = mesh_plink_availables(sdata);
 134
 135         if (free_plinks != sdata->u.mesh.accepting_plinks) {
 136                 sdata->u.mesh.accepting_plinks = free_plinks;
 137                 changed = BSS_CHANGED_BEACON;
 138         }
 139
 140         return changed;
 141 }
 142
 143 /*
 144  * mesh_sta_cleanup - clean up any mesh sta state
 145  *
 146  * @sta: mesh sta to clean up.
 147  */
 148 void mesh_sta_cleanup(struct sta_info *sta)
 149 {
 150         struct ieee80211_sub_if_data *sdata = sta->sdata;
 151         u32 changed;
 152
 153         /*
 154          * maybe userspace handles peer allocation and peering, but in either
 155          * case the beacon is still generated by the kernel and we might need
 156          * an update.
 157          */
 158         changed = mesh_accept_plinks_update(sdata);
 159         if (!sdata->u.mesh.user_mpm) {
 160                 changed |= mesh_plink_deactivate(sta);
 161                 del_timer_sync(&sta->mesh->plink_timer);
 162         }
 163
 164         if (changed)
 165                 ieee80211_mbss_info_change_notify(sdata, changed);
 166 }
 167
 168 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 169 {
 170         int i;
 171
 172         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 173         if (!sdata->u.mesh.rmc)
 174                 return -ENOMEM;
 175         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 176         for (i = 0; i < RMC_BUCKETS; i++)
 177                 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
 178         return 0;
 179 }
 180
 181 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 182 {
 183         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 184         struct rmc_entry *p;
 185         struct hlist_node *n;
 186         int i;
 187
 188         if (!sdata->u.mesh.rmc)
 189                 return;
 190
 191         for (i = 0; i < RMC_BUCKETS; i++) {
 192                 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 193                         hlist_del(&p->list);
 194                         kmem_cache_free(rm_cache, p);
 195                 }
 196         }
 197
 198         kfree(rmc);
 199         sdata->u.mesh.rmc = NULL;
 200 }
 201
 202 /**
 203  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 204  *
 205  * @sdata:      interface
 206  * @sa:         source address
 207  * @mesh_hdr:   mesh_header
 208  *
 209  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 210  *
 211  * Checks using the source address and the mesh sequence number if we have
 212  * received this frame lately. If the frame is not in the cache, it is added to
 213  * it.
 214  */
 215 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
 216                    const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
 217 {
 218         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 219         u32 seqnum = 0;
 220         int entries = 0;
 221         u8 idx;
 222         struct rmc_entry *p;
 223         struct hlist_node *n;
 224
 225         if (!rmc)
 226                 return -1;
 227
 228         /* Don't care about endianness since only match matters */
 229         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 230         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 231         hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 232                 ++entries;
 233                 if (time_after(jiffies, p->exp_time) ||
 234                     entries == RMC_QUEUE_MAX_LEN) {
 235                         hlist_del(&p->list);
 236                         kmem_cache_free(rm_cache, p);
 237                         --entries;
 238                 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
 239                         return -1;
 240         }
 241
 242         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 243         if (!p)
 244                 return 0;
 245
 246         p->seqnum = seqnum;
 247         p->exp_time = jiffies + RMC_TIMEOUT;
 248         memcpy(p->sa, sa, ETH_ALEN);
 249         hlist_add_head(&p->list, &rmc->bucket[idx]);
 250         return 0;
 251 }
 252
 253 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
 254                          struct sk_buff *skb)
 255 {
 256         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 257         u8 *pos, neighbors;
 258         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 259
 260         if (skb_tailroom(skb) < 2 + meshconf_len)
 261                 return -ENOMEM;
 262
 263         pos = skb_put(skb, 2 + meshconf_len);
 264         *pos++ = WLAN_EID_MESH_CONFIG;
 265         *pos++ = meshconf_len;
 266
 267         /* save a pointer for quick updates in pre-tbtt */
 268         ifmsh->meshconf_offset = pos - skb->data;
 269
 270         /* Active path selection protocol ID */
 271         *pos++ = ifmsh->mesh_pp_id;
 272         /* Active path selection metric ID   */
 273         *pos++ = ifmsh->mesh_pm_id;
 274         /* Congestion control mode identifier */
 275         *pos++ = ifmsh->mesh_cc_id;
 276         /* Synchronization protocol identifier */
 277         *pos++ = ifmsh->mesh_sp_id;
 278         /* Authentication Protocol identifier */
 279         *pos++ = ifmsh->mesh_auth_id;
 280         /* Mesh Formation Info - number of neighbors */
 281         neighbors = atomic_read(&ifmsh->estab_plinks);
 282         neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
 283         *pos++ = neighbors << 1;
 284         /* Mesh capability */
 285         *pos = 0x00;
 286         *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
 287                         IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
 288         *pos |= ifmsh->accepting_plinks ?
 289                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 290         /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
 291         *pos |= ifmsh->ps_peers_deep_sleep ?
 292                         IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
 293         *pos++ |= ifmsh->adjusting_tbtt ?
 294                         IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
 295         *pos++ = 0x00;
 296
 297         return 0;
 298 }
 299
 300 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 301 {
 302         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 303         u8 *pos;
 304
 305         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 306                 return -ENOMEM;
 307
 308         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 309         *pos++ = WLAN_EID_MESH_ID;
 310         *pos++ = ifmsh->mesh_id_len;
 311         if (ifmsh->mesh_id_len)
 312                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 313
 314         return 0;
 315 }
 316
 317 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
 318                                     struct sk_buff *skb)
 319 {
 320         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 321         u8 *pos;
 322
 323         /* see IEEE802.11-2012 13.14.6 */
 324         if (ifmsh->ps_peers_light_sleep == 0 &&
 325             ifmsh->ps_peers_deep_sleep == 0 &&
 326             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
 327                 return 0;
 328
 329         if (skb_tailroom(skb) < 4)
 330                 return -ENOMEM;
 331
 332         pos = skb_put(skb, 2 + 2);
 333         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
 334         *pos++ = 2;
 335         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 336
 337         return 0;
 338 }
 339
 340 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 341                         struct sk_buff *skb)
 342 {
 343         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 344         u8 offset, len;
 345         const u8 *data;
 346
 347         if (!ifmsh->ie || !ifmsh->ie_len)
 348                 return 0;
 349
 350         /* fast-forward to vendor IEs */
 351         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 352
 353         if (offset) {
 354                 len = ifmsh->ie_len - offset;
 355                 data = ifmsh->ie + offset;
 356                 if (skb_tailroom(skb) < len)
 357                         return -ENOMEM;
 358                 memcpy(skb_put(skb, len), data, len);
 359         }
 360
 361         return 0;
 362 }
 363
 364 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 365 {
 366         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 367         u8 len = 0;
 368         const u8 *data;
 369
 370         if (!ifmsh->ie || !ifmsh->ie_len)
 371                 return 0;
 372
 373         /* find RSN IE */
 374         data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
 375         if (!data)
 376                 return 0;
 377
 378         len = data[1] + 2;
 379
 380         if (skb_tailroom(skb) < len)
 381                 return -ENOMEM;
 382         memcpy(skb_put(skb, len), data, len);
 383
 384         return 0;
 385 }
 386
 387 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
 388                                  struct sk_buff *skb)
 389 {
 390         struct ieee80211_chanctx_conf *chanctx_conf;
 391         struct ieee80211_channel *chan;
 392         u8 *pos;
 393
 394         if (skb_tailroom(skb) < 3)
 395                 return -ENOMEM;
 396
 397         rcu_read_lock();
 398         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 399         if (WARN_ON(!chanctx_conf)) {
 400                 rcu_read_unlock();
 401                 return -EINVAL;
 402         }
 403         chan = chanctx_conf->def.chan;
 404         rcu_read_unlock();
 405
 406         pos = skb_put(skb, 2 + 1);
 407         *pos++ = WLAN_EID_DS_PARAMS;
 408         *pos++ = 1;
 409         *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 410
 411         return 0;
 412 }
 413
 414 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
 415                        struct sk_buff *skb)
 416 {
 417         struct ieee80211_local *local = sdata->local;
 418         enum nl80211_band band = ieee80211_get_sdata_band(sdata);
 419         struct ieee80211_supported_band *sband;
 420         u8 *pos;
 421
 422         sband = local->hw.wiphy->bands[band];
 423         if (!sband->ht_cap.ht_supported ||
 424             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 425             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 426             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 427                 return 0;
 428
 429         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 430                 return -ENOMEM;
 431
 432         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 433         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 434
 435         return 0;
 436 }
 437
 438 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
 439                         struct sk_buff *skb)
 440 {
 441         struct ieee80211_local *local = sdata->local;
 442         struct ieee80211_chanctx_conf *chanctx_conf;
 443         struct ieee80211_channel *channel;
 444         struct ieee80211_supported_band *sband;
 445         struct ieee80211_sta_ht_cap *ht_cap;
 446         u8 *pos;
 447
 448         rcu_read_lock();
 449         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 450         if (WARN_ON(!chanctx_conf)) {
 451                 rcu_read_unlock();
 452                 return -EINVAL;
 453         }
 454         channel = chanctx_conf->def.chan;
 455         rcu_read_unlock();
 456
 457         sband = local->hw.wiphy->bands[channel->band];
 458         ht_cap = &sband->ht_cap;
 459
 460         if (!ht_cap->ht_supported ||
 461             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 462             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 463             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 464                 return 0;
 465
 466         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 467                 return -ENOMEM;
 468
 469         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 470         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
 471                                    sdata->vif.bss_conf.ht_operation_mode,
 472                                    false);
 473
 474         return 0;
 475 }
 476
 477 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
 478                         struct sk_buff *skb)
 479 {
 480         struct ieee80211_local *local = sdata->local;
 481         enum nl80211_band band = ieee80211_get_sdata_band(sdata);
 482         struct ieee80211_supported_band *sband;
 483         u8 *pos;
 484
 485         sband = local->hw.wiphy->bands[band];
 486         if (!sband->vht_cap.vht_supported ||
 487             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 488             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 489             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 490                 return 0;
 491
 492         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
 493                 return -ENOMEM;
 494
 495         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
 496         ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
 497
 498         return 0;
 499 }
 500
 501 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
 502                          struct sk_buff *skb)
 503 {
 504         struct ieee80211_local *local = sdata->local;
 505         struct ieee80211_chanctx_conf *chanctx_conf;
 506         struct ieee80211_channel *channel;
 507         struct ieee80211_supported_band *sband;
 508         struct ieee80211_sta_vht_cap *vht_cap;
 509         u8 *pos;
 510
 511         rcu_read_lock();
 512         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 513         if (WARN_ON(!chanctx_conf)) {
 514                 rcu_read_unlock();
 515                 return -EINVAL;
 516         }
 517         channel = chanctx_conf->def.chan;
 518         rcu_read_unlock();
 519
 520         sband = local->hw.wiphy->bands[channel->band];
 521         vht_cap = &sband->vht_cap;
 522
 523         if (!vht_cap->vht_supported ||
 524             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 525             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 526             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 527                 return 0;
 528
 529         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
 530                 return -ENOMEM;
 531
 532         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 533         ieee80211_ie_build_vht_oper(pos, vht_cap,
 534                                     &sdata->vif.bss_conf.chandef);
 535
 536         return 0;
 537 }
 538
 539 static void ieee80211_mesh_path_timer(unsigned long data)
 540 {
 541         struct ieee80211_sub_if_data *sdata =
 542                 (struct ieee80211_sub_if_data *) data;
 543
 544         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 545 }
 546
 547 static void ieee80211_mesh_path_root_timer(unsigned long data)
 548 {
 549         struct ieee80211_sub_if_data *sdata =
 550                 (struct ieee80211_sub_if_data *) data;
 551         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 552
 553         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 554
 555         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 556 }
 557
 558 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 559 {
 560         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 561                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 562         else {
 563                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 564                 /* stop running timer */
 565                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 566         }
 567 }
 568
 569 /**
 570  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 571  * @hdr:        802.11 frame header
 572  * @fc:         frame control field
 573  * @meshda:     destination address in the mesh
 574  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 575  *              locally originated.
 576  *
 577  * Return the length of the 802.11 (does not include a mesh control header)
 578  */
 579 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 580                                   const u8 *meshda, const u8 *meshsa)
 581 {
 582         if (is_multicast_ether_addr(meshda)) {
 583                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 584                 /* DA TA SA */
 585                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 586                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 587                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 588                 return 24;
 589         } else {
 590                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 591                 /* RA TA DA SA */
 592                 eth_zero_addr(hdr->addr1);   /* RA is resolved later */
 593                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 594                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 595                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 596                 return 30;
 597         }
 598 }
 599
 600 /**
 601  * ieee80211_new_mesh_header - create a new mesh header
 602  * @sdata:      mesh interface to be used
 603  * @meshhdr:    uninitialized mesh header
 604  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 605  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 606  *              be NULL.
 607  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 608  *              mesh frame
 609  *
 610  * Return the header length.
 611  */
 612 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 613                                        struct ieee80211s_hdr *meshhdr,
 614                                        const char *addr4or5, const char *addr6)
 615 {
 616         if (WARN_ON(!addr4or5 && addr6))
 617                 return 0;
 618
 619         memset(meshhdr, 0, sizeof(*meshhdr));
 620
 621         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 622
 623         /* FIXME: racy -- TX on multiple queues can be concurrent */
 624         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 625         sdata->u.mesh.mesh_seqnum++;
 626
 627         if (addr4or5 && !addr6) {
 628                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 629                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 630                 return 2 * ETH_ALEN;
 631         } else if (addr4or5 && addr6) {
 632                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 633                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 634                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 635                 return 3 * ETH_ALEN;
 636         }
 637
 638         return ETH_ALEN;
 639 }
 640
 641 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 642 {
 643         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 644         u32 changed;
 645
 646         if (ifmsh->mshcfg.plink_timeout > 0)
 647                 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
 648         mesh_path_expire(sdata);
 649
 650         changed = mesh_accept_plinks_update(sdata);
 651         ieee80211_mbss_info_change_notify(sdata, changed);
 652
 653         mod_timer(&ifmsh->housekeeping_timer,
 654                   round_jiffies(jiffies +
 655                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 656 }
 657
 658 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 659 {
 660         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 661         u32 interval;
 662
 663         mesh_path_tx_root_frame(sdata);
 664
 665         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 666                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 667         else
 668                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 669
 670         mod_timer(&ifmsh->mesh_path_root_timer,
 671                   round_jiffies(TU_TO_EXP_TIME(interval)));
 672 }
 673
 674 static int
 675 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 676 {
 677         struct beacon_data *bcn;
 678         int head_len, tail_len;
 679         struct sk_buff *skb;
 680         struct ieee80211_mgmt *mgmt;
 681         struct ieee80211_chanctx_conf *chanctx_conf;
 682         struct mesh_csa_settings *csa;
 683         enum nl80211_band band;
 684         u8 *pos;
 685         struct ieee80211_sub_if_data *sdata;
 686         int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
 687                       sizeof(mgmt->u.beacon);
 688
 689         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 690         rcu_read_lock();
 691         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 692         band = chanctx_conf->def.chan->band;
 693         rcu_read_unlock();
 694
 695         head_len = hdr_len +
 696                    2 + /* NULL SSID */
 697                    /* Channel Switch Announcement */
 698                    2 + sizeof(struct ieee80211_channel_sw_ie) +
 699                    /* Mesh Channel Swith Parameters */
 700                    2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
 701                    2 + 8 + /* supported rates */
 702                    2 + 3; /* DS params */
 703         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 704                    2 + sizeof(struct ieee80211_ht_cap) +
 705                    2 + sizeof(struct ieee80211_ht_operation) +
 706                    2 + ifmsh->mesh_id_len +
 707                    2 + sizeof(struct ieee80211_meshconf_ie) +
 708                    2 + sizeof(__le16) + /* awake window */
 709                    2 + sizeof(struct ieee80211_vht_cap) +
 710                    2 + sizeof(struct ieee80211_vht_operation) +
 711                    ifmsh->ie_len;
 712
 713         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
 714         /* need an skb for IE builders to operate on */
 715         skb = dev_alloc_skb(max(head_len, tail_len));
 716
 717         if (!bcn || !skb)
 718                 goto out_free;
 719
 720         /*
 721          * pointers go into the block we allocated,
 722          * memory is | beacon_data | head | tail |
 723          */
 724         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
 725
 726         /* fill in the head */
 727         mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
 728         memset(mgmt, 0, hdr_len);
 729         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 730                                           IEEE80211_STYPE_BEACON);
 731         eth_broadcast_addr(mgmt->da);
 732         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 733         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 734         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
 735         mgmt->u.beacon.beacon_int =
 736                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
 737         mgmt->u.beacon.capab_info |= cpu_to_le16(
 738                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
 739
 740         pos = skb_put(skb, 2);
 741         *pos++ = WLAN_EID_SSID;
 742         *pos++ = 0x0;
 743
 744         rcu_read_lock();
 745         csa = rcu_dereference(ifmsh->csa);
 746         if (csa) {
 747                 pos = skb_put(skb, 13);
 748                 memset(pos, 0, 13);
 749                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 750                 *pos++ = 3;
 751                 *pos++ = 0x0;
 752                 *pos++ = ieee80211_frequency_to_channel(
 753                                 csa->settings.chandef.chan->center_freq);
 754                 bcn->csa_current_counter = csa->settings.count;
 755                 bcn->csa_counter_offsets[0] = hdr_len + 6;
 756                 *pos++ = csa->settings.count;
 757                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
 758                 *pos++ = 6;
 759                 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
 760                         *pos++ = ifmsh->mshcfg.dot11MeshTTL;
 761                         *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
 762                 } else {
 763                         *pos++ = ifmsh->chsw_ttl;
 764                 }
 765                 *pos++ |= csa->settings.block_tx ?
 766                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
 767                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
 768                 pos += 2;
 769                 put_unaligned_le16(ifmsh->pre_value, pos);
 770                 pos += 2;
 771         }
 772         rcu_read_unlock();
 773
 774         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
 775             mesh_add_ds_params_ie(sdata, skb))
 776                 goto out_free;
 777
 778         bcn->head_len = skb->len;
 779         memcpy(bcn->head, skb->data, bcn->head_len);
 780
 781         /* now the tail */
 782         skb_trim(skb, 0);
 783         bcn->tail = bcn->head + bcn->head_len;
 784
 785         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
 786             mesh_add_rsn_ie(sdata, skb) ||
 787             mesh_add_ht_cap_ie(sdata, skb) ||
 788             mesh_add_ht_oper_ie(sdata, skb) ||
 789             mesh_add_meshid_ie(sdata, skb) ||
 790             mesh_add_meshconf_ie(sdata, skb) ||
 791             mesh_add_awake_window_ie(sdata, skb) ||
 792             mesh_add_vht_cap_ie(sdata, skb) ||
 793             mesh_add_vht_oper_ie(sdata, skb) ||
 794             mesh_add_vendor_ies(sdata, skb))
 795                 goto out_free;
 796
 797         bcn->tail_len = skb->len;
 798         memcpy(bcn->tail, skb->data, bcn->tail_len);
 799         bcn->meshconf = (struct ieee80211_meshconf_ie *)
 800                                         (bcn->tail + ifmsh->meshconf_offset);
 801
 802         dev_kfree_skb(skb);
 803         rcu_assign_pointer(ifmsh->beacon, bcn);
 804         return 0;
 805 out_free:
 806         kfree(bcn);
 807         dev_kfree_skb(skb);
 808         return -ENOMEM;
 809 }
 810
 811 static int
 812 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
 813 {
 814         struct beacon_data *old_bcn;
 815         int ret;
 816
 817         old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
 818                                             lockdep_is_held(&sdata->wdev.mtx));
 819         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
 820         if (ret)
 821                 /* just reuse old beacon */
 822                 return ret;
 823
 824         if (old_bcn)
 825                 kfree_rcu(old_bcn, rcu_head);
 826         return 0;
 827 }
 828
 829 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 830                                        u32 changed)
 831 {
 832         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 833         unsigned long bits = changed;
 834         u32 bit;
 835
 836         if (!bits)
 837                 return;
 838
 839         /* if we race with running work, worst case this work becomes a noop */
 840         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
 841                 set_bit(bit, &ifmsh->mbss_changed);
 842         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
 843         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 844 }
 845
 846 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 847 {
 848         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 849         struct ieee80211_local *local = sdata->local;
 850         u32 changed = BSS_CHANGED_BEACON |
 851                       BSS_CHANGED_BEACON_ENABLED |
 852                       BSS_CHANGED_HT |
 853                       BSS_CHANGED_BASIC_RATES |
 854                       BSS_CHANGED_BEACON_INT;
 855
 856         local->fif_other_bss++;
 857         /* mesh ifaces must set allmulti to forward mcast traffic */
 858         atomic_inc(&local->iff_allmultis);
 859         ieee80211_configure_filter(local);
 860
 861         ifmsh->mesh_cc_id = 0;  /* Disabled */
 862         /* register sync ops from extensible synchronization framework */
 863         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 864         ifmsh->adjusting_tbtt = false;
 865         ifmsh->sync_offset_clockdrift_max = 0;
 866         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 867         ieee80211_mesh_root_setup(ifmsh);
 868         ieee80211_queue_work(&local->hw, &sdata->work);
 869         sdata->vif.bss_conf.ht_operation_mode =
 870                                 ifmsh->mshcfg.ht_opmode;
 871         sdata->vif.bss_conf.enable_beacon = true;
 872
 873         changed |= ieee80211_mps_local_status_update(sdata);
 874
 875         if (ieee80211_mesh_build_beacon(ifmsh)) {
 876                 ieee80211_stop_mesh(sdata);
 877                 return -ENOMEM;
 878         }
 879
 880         ieee80211_recalc_dtim(local, sdata);
 881         ieee80211_bss_info_change_notify(sdata, changed);
 882
 883         netif_carrier_on(sdata->dev);
 884         return 0;
 885 }
 886
 887 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 888 {
 889         struct ieee80211_local *local = sdata->local;
 890         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 891         struct beacon_data *bcn;
 892
 893         netif_carrier_off(sdata->dev);
 894
 895         /* stop the beacon */
 896         ifmsh->mesh_id_len = 0;
 897         sdata->vif.bss_conf.enable_beacon = false;
 898         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 899         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 900         bcn = rcu_dereference_protected(ifmsh->beacon,
 901                                         lockdep_is_held(&sdata->wdev.mtx));
 902         RCU_INIT_POINTER(ifmsh->beacon, NULL);
 903         kfree_rcu(bcn, rcu_head);
 904
 905         /* flush STAs and mpaths on this iface */
 906         sta_info_flush(sdata);
 907         mesh_path_flush_by_iface(sdata);
 908
 909         /* free all potentially still buffered group-addressed frames */
 910         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
 911         skb_queue_purge(&ifmsh->ps.bc_buf);
 912
 913         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 914         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 915         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 916
 917         /* clear any mesh work (for next join) we may have accrued */
 918         ifmsh->wrkq_flags = 0;
 919         ifmsh->mbss_changed = 0;
 920
 921         local->fif_other_bss--;
 922         atomic_dec(&local->iff_allmultis);
 923         ieee80211_configure_filter(local);
 924 }
 925
 926 static bool
 927 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
 928                                  struct ieee802_11_elems *elems, bool beacon)
 929 {
 930         struct cfg80211_csa_settings params;
 931         struct ieee80211_csa_ie csa_ie;
 932         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 933         enum nl80211_band band = ieee80211_get_sdata_band(sdata);
 934         int err;
 935         u32 sta_flags;
 936
 937         sdata_assert_lock(sdata);
 938
 939         sta_flags = IEEE80211_STA_DISABLE_VHT;
 940         switch (sdata->vif.bss_conf.chandef.width) {
 941         case NL80211_CHAN_WIDTH_20_NOHT:
 942                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 943         case NL80211_CHAN_WIDTH_20:
 944                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 945                 break;
 946         default:
 947                 break;
 948         }
 949
 950         memset(&params, 0, sizeof(params));
 951         memset(&csa_ie, 0, sizeof(csa_ie));
 952         err = ieee80211_parse_ch_switch_ie(sdata, elems, band,
 953                                            sta_flags, sdata->vif.addr,
 954                                            &csa_ie);
 955         if (err < 0)
 956                 return false;
 957         if (err)
 958                 return false;
 959
 960         params.chandef = csa_ie.chandef;
 961         params.count = csa_ie.count;
 962
 963         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
 964                                      IEEE80211_CHAN_DISABLED)) {
 965                 sdata_info(sdata,
 966                            "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
 967                            sdata->vif.addr,
 968                            params.chandef.chan->center_freq,
 969                            params.chandef.width,
 970                            params.chandef.center_freq1,
 971                            params.chandef.center_freq2);
 972                 return false;
 973         }
 974
 975         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 976                                             &params.chandef,
 977                                             NL80211_IFTYPE_MESH_POINT);
 978         if (err < 0)
 979                 return false;
 980         if (err > 0)
 981                 /* TODO: DFS not (yet) supported */
 982                 return false;
 983
 984         params.radar_required = err;
 985
 986         if (cfg80211_chandef_identical(&params.chandef,
 987                                        &sdata->vif.bss_conf.chandef)) {
 988                 mcsa_dbg(sdata,
 989                          "received csa with an identical chandef, ignoring\n");
 990                 return true;
 991         }
 992
 993         mcsa_dbg(sdata,
 994                  "received channel switch announcement to go to channel %d MHz\n",
 995                  params.chandef.chan->center_freq);
 996
 997         params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
 998         if (beacon) {
 999                 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1000                 if (ifmsh->pre_value >= csa_ie.pre_value)
1001                         return false;
1002                 ifmsh->pre_value = csa_ie.pre_value;
1003         }
1004
1005         if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1006                 return false;
1007
1008         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1009
1010         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1011                                      &params) < 0)
1012                 return false;
1013
1014         return true;
1015 }
1016
1017 static void
1018 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1019                             struct ieee80211_mgmt *mgmt, size_t len)
1020 {
1021         struct ieee80211_local *local = sdata->local;
1022         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1023         struct sk_buff *presp;
1024         struct beacon_data *bcn;
1025         struct ieee80211_mgmt *hdr;
1026         struct ieee802_11_elems elems;
1027         size_t baselen;
1028         u8 *pos;
1029
1030         pos = mgmt->u.probe_req.variable;
1031         baselen = (u8 *) pos - (u8 *) mgmt;
1032         if (baselen > len)
1033                 return;
1034
1035         ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1036
1037         if (!elems.mesh_id)
1038                 return;
1039
1040         /* 802.11-2012 10.1.4.3.2 */
1041         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1042              !is_broadcast_ether_addr(mgmt->da)) ||
1043             elems.ssid_len != 0)
1044                 return;
1045
1046         if (elems.mesh_id_len != 0 &&
1047             (elems.mesh_id_len != ifmsh->mesh_id_len ||
1048              memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1049                 return;
1050
1051         rcu_read_lock();
1052         bcn = rcu_dereference(ifmsh->beacon);
1053
1054         if (!bcn)
1055                 goto out;
1056
1057         presp = dev_alloc_skb(local->tx_headroom +
1058                               bcn->head_len + bcn->tail_len);
1059         if (!presp)
1060                 goto out;
1061
1062         skb_reserve(presp, local->tx_headroom);
1063         memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
1064         memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
1065         hdr = (struct ieee80211_mgmt *) presp->data;
1066         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1067                                          IEEE80211_STYPE_PROBE_RESP);
1068         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1069         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1070         ieee80211_tx_skb(sdata, presp);
1071 out:
1072         rcu_read_unlock();
1073 }
1074
1075 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1076                                         u16 stype,
1077                                         struct ieee80211_mgmt *mgmt,
1078                                         size_t len,
1079                                         struct ieee80211_rx_status *rx_status)
1080 {
1081         struct ieee80211_local *local = sdata->local;
1082         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1083         struct ieee802_11_elems elems;
1084         struct ieee80211_channel *channel;
1085         size_t baselen;
1086         int freq;
1087         enum nl80211_band band = rx_status->band;
1088
1089         /* ignore ProbeResp to foreign address */
1090         if (stype == IEEE80211_STYPE_PROBE_RESP &&
1091             !ether_addr_equal(mgmt->da, sdata->vif.addr))
1092                 return;
1093
1094         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1095         if (baselen > len)
1096                 return;
1097
1098         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1099                                false, &elems);
1100
1101         /* ignore non-mesh or secure / unsecure mismatch */
1102         if ((!elems.mesh_id || !elems.mesh_config) ||
1103             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1104             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1105                 return;
1106
1107         if (elems.ds_params)
1108                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1109         else
1110                 freq = rx_status->freq;
1111
1112         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1113
1114         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1115                 return;
1116
1117         if (mesh_matches_local(sdata, &elems))
1118                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
1119
1120         if (ifmsh->sync_ops)
1121                 ifmsh->sync_ops->rx_bcn_presp(sdata,
1122                         stype, mgmt, &elems, rx_status);
1123
1124         if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1125             !sdata->vif.csa_active)
1126                 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1127 }
1128
1129 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1130 {
1131         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1132         struct mesh_csa_settings *tmp_csa_settings;
1133         int ret = 0;
1134         int changed = 0;
1135
1136         /* Reset the TTL value and Initiator flag */
1137         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1138         ifmsh->chsw_ttl = 0;
1139
1140         /* Remove the CSA and MCSP elements from the beacon */
1141         tmp_csa_settings = rcu_dereference(ifmsh->csa);
1142         RCU_INIT_POINTER(ifmsh->csa, NULL);
1143         if (tmp_csa_settings)
1144                 kfree_rcu(tmp_csa_settings, rcu_head);
1145         ret = ieee80211_mesh_rebuild_beacon(sdata);
1146         if (ret)
1147                 return -EINVAL;
1148
1149         changed |= BSS_CHANGED_BEACON;
1150
1151         mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1152                  sdata->vif.bss_conf.chandef.chan->center_freq);
1153         return changed;
1154 }
1155
1156 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1157                               struct cfg80211_csa_settings *csa_settings)
1158 {
1159         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1160         struct mesh_csa_settings *tmp_csa_settings;
1161         int ret = 0;
1162
1163         tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1164                                    GFP_ATOMIC);
1165         if (!tmp_csa_settings)
1166                 return -ENOMEM;
1167
1168         memcpy(&tmp_csa_settings->settings, csa_settings,
1169                sizeof(struct cfg80211_csa_settings));
1170
1171         rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1172
1173         ret = ieee80211_mesh_rebuild_beacon(sdata);
1174         if (ret) {
1175                 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1176                 RCU_INIT_POINTER(ifmsh->csa, NULL);
1177                 kfree_rcu(tmp_csa_settings, rcu_head);
1178                 return ret;
1179         }
1180
1181         return BSS_CHANGED_BEACON;
1182 }
1183
1184 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1185                                struct ieee80211_mgmt *mgmt, size_t len)
1186 {
1187         struct ieee80211_mgmt *mgmt_fwd;
1188         struct sk_buff *skb;
1189         struct ieee80211_local *local = sdata->local;
1190         u8 *pos = mgmt->u.action.u.chan_switch.variable;
1191         size_t offset_ttl;
1192
1193         skb = dev_alloc_skb(local->tx_headroom + len);
1194         if (!skb)
1195                 return -ENOMEM;
1196         skb_reserve(skb, local->tx_headroom);
1197         mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
1198
1199         /* offset_ttl is based on whether the secondary channel
1200          * offset is available or not. Subtract 1 from the mesh TTL
1201          * and disable the initiator flag before forwarding.
1202          */
1203         offset_ttl = (len < 42) ? 7 : 10;
1204         *(pos + offset_ttl) -= 1;
1205         *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1206
1207         memcpy(mgmt_fwd, mgmt, len);
1208         eth_broadcast_addr(mgmt_fwd->da);
1209         memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1210         memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1211
1212         ieee80211_tx_skb(sdata, skb);
1213         return 0;
1214 }
1215
1216 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1217                               struct ieee80211_mgmt *mgmt, size_t len)
1218 {
1219         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1220         struct ieee802_11_elems elems;
1221         u16 pre_value;
1222         bool fwd_csa = true;
1223         size_t baselen;
1224         u8 *pos;
1225
1226         if (mgmt->u.action.u.measurement.action_code !=
1227             WLAN_ACTION_SPCT_CHL_SWITCH)
1228                 return;
1229
1230         pos = mgmt->u.action.u.chan_switch.variable;
1231         baselen = offsetof(struct ieee80211_mgmt,
1232                            u.action.u.chan_switch.variable);
1233         ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1234
1235         ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1236         if (!--ifmsh->chsw_ttl)
1237                 fwd_csa = false;
1238
1239         pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1240         if (ifmsh->pre_value >= pre_value)
1241                 return;
1242
1243         ifmsh->pre_value = pre_value;
1244
1245         if (!sdata->vif.csa_active &&
1246             !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1247                 mcsa_dbg(sdata, "Failed to process CSA action frame");
1248                 return;
1249         }
1250
1251         /* forward or re-broadcast the CSA frame */
1252         if (fwd_csa) {
1253                 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
1254                         mcsa_dbg(sdata, "Failed to forward the CSA frame");
1255         }
1256 }
1257
1258 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1259                                           struct ieee80211_mgmt *mgmt,
1260                                           size_t len,
1261                                           struct ieee80211_rx_status *rx_status)
1262 {
1263         switch (mgmt->u.action.category) {
1264         case WLAN_CATEGORY_SELF_PROTECTED:
1265                 switch (mgmt->u.action.u.self_prot.action_code) {
1266                 case WLAN_SP_MESH_PEERING_OPEN:
1267                 case WLAN_SP_MESH_PEERING_CLOSE:
1268                 case WLAN_SP_MESH_PEERING_CONFIRM:
1269                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1270                         break;
1271                 }
1272                 break;
1273         case WLAN_CATEGORY_MESH_ACTION:
1274                 if (mesh_action_is_path_sel(mgmt))
1275                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1276                 break;
1277         case WLAN_CATEGORY_SPECTRUM_MGMT:
1278                 mesh_rx_csa_frame(sdata, mgmt, len);
1279                 break;
1280         }
1281 }
1282
1283 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1284                                    struct sk_buff *skb)
1285 {
1286         struct ieee80211_rx_status *rx_status;
1287         struct ieee80211_mgmt *mgmt;
1288         u16 stype;
1289
1290         sdata_lock(sdata);
1291
1292         /* mesh already went down */
1293         if (!sdata->u.mesh.mesh_id_len)
1294                 goto out;
1295
1296         rx_status = IEEE80211_SKB_RXCB(skb);
1297         mgmt = (struct ieee80211_mgmt *) skb->data;
1298         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1299
1300         switch (stype) {
1301         case IEEE80211_STYPE_PROBE_RESP:
1302         case IEEE80211_STYPE_BEACON:
1303                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1304                                             rx_status);
1305                 break;
1306         case IEEE80211_STYPE_PROBE_REQ:
1307                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1308                 break;
1309         case IEEE80211_STYPE_ACTION:
1310                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1311                 break;
1312         }
1313 out:
1314         sdata_unlock(sdata);
1315 }
1316
1317 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1318 {
1319         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1320         u32 bit, changed = 0;
1321
1322         for_each_set_bit(bit, &ifmsh->mbss_changed,
1323                          sizeof(changed) * BITS_PER_BYTE) {
1324                 clear_bit(bit, &ifmsh->mbss_changed);
1325                 changed |= BIT(bit);
1326         }
1327
1328         if (sdata->vif.bss_conf.enable_beacon &&
1329             (changed & (BSS_CHANGED_BEACON |
1330                         BSS_CHANGED_HT |
1331                         BSS_CHANGED_BASIC_RATES |
1332                         BSS_CHANGED_BEACON_INT)))
1333                 if (ieee80211_mesh_rebuild_beacon(sdata))
1334                         return;
1335
1336         ieee80211_bss_info_change_notify(sdata, changed);
1337 }
1338
1339 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1340 {
1341         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1342
1343         sdata_lock(sdata);
1344
1345         /* mesh already went down */
1346         if (!sdata->u.mesh.mesh_id_len)
1347                 goto out;
1348
1349         if (ifmsh->preq_queue_len &&
1350             time_after(jiffies,
1351                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1352                 mesh_path_start_discovery(sdata);
1353
1354         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1355                 ieee80211_mesh_housekeeping(sdata);
1356
1357         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1358                 ieee80211_mesh_rootpath(sdata);
1359
1360         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1361                 mesh_sync_adjust_tbtt(sdata);
1362
1363         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1364                 mesh_bss_info_changed(sdata);
1365 out:
1366         sdata_unlock(sdata);
1367 }
1368
1369
1370 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1371 {
1372         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1373         static u8 zero_addr[ETH_ALEN] = {};
1374
1375         setup_timer(&ifmsh->housekeeping_timer,
1376                     ieee80211_mesh_housekeeping_timer,
1377                     (unsigned long) sdata);
1378
1379         ifmsh->accepting_plinks = true;
1380         atomic_set(&ifmsh->mpaths, 0);
1381         mesh_rmc_init(sdata);
1382         ifmsh->last_preq = jiffies;
1383         ifmsh->next_perr = jiffies;
1384         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1385         /* Allocate all mesh structures when creating the first mesh interface. */
1386         if (!mesh_allocated)
1387                 ieee80211s_init();
1388
1389         mesh_pathtbl_init(sdata);
1390
1391         setup_timer(&ifmsh->mesh_path_timer,
1392                     ieee80211_mesh_path_timer,
1393                     (unsigned long) sdata);
1394         setup_timer(&ifmsh->mesh_path_root_timer,
1395                     ieee80211_mesh_path_root_timer,
1396                     (unsigned long) sdata);
1397         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1398         skb_queue_head_init(&ifmsh->ps.bc_buf);
1399         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1400         spin_lock_init(&ifmsh->sync_offset_lock);
1401         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1402
1403         sdata->vif.bss_conf.bssid = zero_addr;
1404 }
1405
1406 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1407 {
1408         mesh_rmc_free(sdata);
1409         mesh_pathtbl_unregister(sdata);
1410 }