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_LIST_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, *n;
 185         int i;
 186
 187         if (!sdata->u.mesh.rmc)
 188                 return;
 189
 190         for (i = 0; i < RMC_BUCKETS; i++) {
 191                 list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 192                         list_del(&p->list);
 193                         kmem_cache_free(rm_cache, p);
 194                 }
 195         }
 196
 197         kfree(rmc);
 198         sdata->u.mesh.rmc = NULL;
 199 }
 200
 201 /**
 202  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 203  *
 204  * @sdata:      interface
 205  * @sa:         source address
 206  * @mesh_hdr:   mesh_header
 207  *
 208  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 209  *
 210  * Checks using the source address and the mesh sequence number if we have
 211  * received this frame lately. If the frame is not in the cache, it is added to
 212  * it.
 213  */
 214 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
 215                    const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
 216 {
 217         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 218         u32 seqnum = 0;
 219         int entries = 0;
 220         u8 idx;
 221         struct rmc_entry *p, *n;
 222
 223         /* Don't care about endianness since only match matters */
 224         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 225         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 226         list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 227                 ++entries;
 228                 if (time_after(jiffies, p->exp_time) ||
 229                     entries == RMC_QUEUE_MAX_LEN) {
 230                         list_del(&p->list);
 231                         kmem_cache_free(rm_cache, p);
 232                         --entries;
 233                 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
 234                         return -1;
 235         }
 236
 237         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 238         if (!p)
 239                 return 0;
 240
 241         p->seqnum = seqnum;
 242         p->exp_time = jiffies + RMC_TIMEOUT;
 243         memcpy(p->sa, sa, ETH_ALEN);
 244         list_add(&p->list, &rmc->bucket[idx]);
 245         return 0;
 246 }
 247
 248 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
 249                          struct sk_buff *skb)
 250 {
 251         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 252         u8 *pos, neighbors;
 253         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 254
 255         if (skb_tailroom(skb) < 2 + meshconf_len)
 256                 return -ENOMEM;
 257
 258         pos = skb_put(skb, 2 + meshconf_len);
 259         *pos++ = WLAN_EID_MESH_CONFIG;
 260         *pos++ = meshconf_len;
 261
 262         /* save a pointer for quick updates in pre-tbtt */
 263         ifmsh->meshconf_offset = pos - skb->data;
 264
 265         /* Active path selection protocol ID */
 266         *pos++ = ifmsh->mesh_pp_id;
 267         /* Active path selection metric ID   */
 268         *pos++ = ifmsh->mesh_pm_id;
 269         /* Congestion control mode identifier */
 270         *pos++ = ifmsh->mesh_cc_id;
 271         /* Synchronization protocol identifier */
 272         *pos++ = ifmsh->mesh_sp_id;
 273         /* Authentication Protocol identifier */
 274         *pos++ = ifmsh->mesh_auth_id;
 275         /* Mesh Formation Info - number of neighbors */
 276         neighbors = atomic_read(&ifmsh->estab_plinks);
 277         neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
 278         *pos++ = neighbors << 1;
 279         /* Mesh capability */
 280         *pos = 0x00;
 281         *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
 282                         IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
 283         *pos |= ifmsh->accepting_plinks ?
 284                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 285         /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
 286         *pos |= ifmsh->ps_peers_deep_sleep ?
 287                         IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
 288         *pos++ |= ifmsh->adjusting_tbtt ?
 289                         IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
 290         *pos++ = 0x00;
 291
 292         return 0;
 293 }
 294
 295 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 296 {
 297         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 298         u8 *pos;
 299
 300         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 301                 return -ENOMEM;
 302
 303         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 304         *pos++ = WLAN_EID_MESH_ID;
 305         *pos++ = ifmsh->mesh_id_len;
 306         if (ifmsh->mesh_id_len)
 307                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 308
 309         return 0;
 310 }
 311
 312 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
 313                                     struct sk_buff *skb)
 314 {
 315         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 316         u8 *pos;
 317
 318         /* see IEEE802.11-2012 13.14.6 */
 319         if (ifmsh->ps_peers_light_sleep == 0 &&
 320             ifmsh->ps_peers_deep_sleep == 0 &&
 321             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
 322                 return 0;
 323
 324         if (skb_tailroom(skb) < 4)
 325                 return -ENOMEM;
 326
 327         pos = skb_put(skb, 2 + 2);
 328         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
 329         *pos++ = 2;
 330         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 331
 332         return 0;
 333 }
 334
 335 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 336                         struct sk_buff *skb)
 337 {
 338         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 339         u8 offset, len;
 340         const u8 *data;
 341
 342         if (!ifmsh->ie || !ifmsh->ie_len)
 343                 return 0;
 344
 345         /* fast-forward to vendor IEs */
 346         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 347
 348         if (offset) {
 349                 len = ifmsh->ie_len - offset;
 350                 data = ifmsh->ie + offset;
 351                 if (skb_tailroom(skb) < len)
 352                         return -ENOMEM;
 353                 memcpy(skb_put(skb, len), data, len);
 354         }
 355
 356         return 0;
 357 }
 358
 359 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 360 {
 361         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 362         u8 len = 0;
 363         const u8 *data;
 364
 365         if (!ifmsh->ie || !ifmsh->ie_len)
 366                 return 0;
 367
 368         /* find RSN IE */
 369         data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
 370         if (!data)
 371                 return 0;
 372
 373         len = data[1] + 2;
 374
 375         if (skb_tailroom(skb) < len)
 376                 return -ENOMEM;
 377         memcpy(skb_put(skb, len), data, len);
 378
 379         return 0;
 380 }
 381
 382 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
 383                                  struct sk_buff *skb)
 384 {
 385         struct ieee80211_chanctx_conf *chanctx_conf;
 386         struct ieee80211_channel *chan;
 387         u8 *pos;
 388
 389         if (skb_tailroom(skb) < 3)
 390                 return -ENOMEM;
 391
 392         rcu_read_lock();
 393         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 394         if (WARN_ON(!chanctx_conf)) {
 395                 rcu_read_unlock();
 396                 return -EINVAL;
 397         }
 398         chan = chanctx_conf->def.chan;
 399         rcu_read_unlock();
 400
 401         pos = skb_put(skb, 2 + 1);
 402         *pos++ = WLAN_EID_DS_PARAMS;
 403         *pos++ = 1;
 404         *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 405
 406         return 0;
 407 }
 408
 409 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
 410                        struct sk_buff *skb)
 411 {
 412         struct ieee80211_local *local = sdata->local;
 413         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 414         struct ieee80211_supported_band *sband;
 415         u8 *pos;
 416
 417         sband = local->hw.wiphy->bands[band];
 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_local *local = sdata->local;
 476         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 477         struct ieee80211_supported_band *sband;
 478         u8 *pos;
 479
 480         sband = local->hw.wiphy->bands[band];
 481         if (!sband->vht_cap.vht_supported ||
 482             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 483             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 484             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 485                 return 0;
 486
 487         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
 488                 return -ENOMEM;
 489
 490         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
 491         ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
 492
 493         return 0;
 494 }
 495
 496 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
 497                          struct sk_buff *skb)
 498 {
 499         struct ieee80211_local *local = sdata->local;
 500         struct ieee80211_chanctx_conf *chanctx_conf;
 501         struct ieee80211_channel *channel;
 502         struct ieee80211_supported_band *sband;
 503         struct ieee80211_sta_vht_cap *vht_cap;
 504         u8 *pos;
 505
 506         rcu_read_lock();
 507         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 508         if (WARN_ON(!chanctx_conf)) {
 509                 rcu_read_unlock();
 510                 return -EINVAL;
 511         }
 512         channel = chanctx_conf->def.chan;
 513         rcu_read_unlock();
 514
 515         sband = local->hw.wiphy->bands[channel->band];
 516         vht_cap = &sband->vht_cap;
 517
 518         if (!vht_cap->vht_supported ||
 519             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 520             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 521             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 522                 return 0;
 523
 524         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
 525                 return -ENOMEM;
 526
 527         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 528         ieee80211_ie_build_vht_oper(pos, vht_cap,
 529                                     &sdata->vif.bss_conf.chandef);
 530
 531         return 0;
 532 }
 533
 534 static void ieee80211_mesh_path_timer(unsigned long data)
 535 {
 536         struct ieee80211_sub_if_data *sdata =
 537                 (struct ieee80211_sub_if_data *) data;
 538
 539         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 540 }
 541
 542 static void ieee80211_mesh_path_root_timer(unsigned long data)
 543 {
 544         struct ieee80211_sub_if_data *sdata =
 545                 (struct ieee80211_sub_if_data *) data;
 546         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 547
 548         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 549
 550         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 551 }
 552
 553 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 554 {
 555         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 556                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 557         else {
 558                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 559                 /* stop running timer */
 560                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 561         }
 562 }
 563
 564 /**
 565  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 566  * @hdr:        802.11 frame header
 567  * @fc:         frame control field
 568  * @meshda:     destination address in the mesh
 569  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 570  *              locally originated.
 571  *
 572  * Return the length of the 802.11 (does not include a mesh control header)
 573  */
 574 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 575                                   const u8 *meshda, const u8 *meshsa)
 576 {
 577         if (is_multicast_ether_addr(meshda)) {
 578                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 579                 /* DA TA SA */
 580                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 581                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 582                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 583                 return 24;
 584         } else {
 585                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 586                 /* RA TA DA SA */
 587                 eth_zero_addr(hdr->addr1);   /* RA is resolved later */
 588                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 589                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 590                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 591                 return 30;
 592         }
 593 }
 594
 595 /**
 596  * ieee80211_new_mesh_header - create a new mesh header
 597  * @sdata:      mesh interface to be used
 598  * @meshhdr:    uninitialized mesh header
 599  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 600  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 601  *              be NULL.
 602  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 603  *              mesh frame
 604  *
 605  * Return the header length.
 606  */
 607 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 608                                        struct ieee80211s_hdr *meshhdr,
 609                                        const char *addr4or5, const char *addr6)
 610 {
 611         if (WARN_ON(!addr4or5 && addr6))
 612                 return 0;
 613
 614         memset(meshhdr, 0, sizeof(*meshhdr));
 615
 616         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 617
 618         /* FIXME: racy -- TX on multiple queues can be concurrent */
 619         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 620         sdata->u.mesh.mesh_seqnum++;
 621
 622         if (addr4or5 && !addr6) {
 623                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 624                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 625                 return 2 * ETH_ALEN;
 626         } else if (addr4or5 && addr6) {
 627                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 628                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 629                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 630                 return 3 * ETH_ALEN;
 631         }
 632
 633         return ETH_ALEN;
 634 }
 635
 636 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 637 {
 638         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 639         u32 changed;
 640
 641         if (ifmsh->mshcfg.plink_timeout > 0)
 642                 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
 643         mesh_path_expire(sdata);
 644
 645         changed = mesh_accept_plinks_update(sdata);
 646         ieee80211_mbss_info_change_notify(sdata, changed);
 647
 648         mod_timer(&ifmsh->housekeeping_timer,
 649                   round_jiffies(jiffies +
 650                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 651 }
 652
 653 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 654 {
 655         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 656         u32 interval;
 657
 658         mesh_path_tx_root_frame(sdata);
 659
 660         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 661                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 662         else
 663                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 664
 665         mod_timer(&ifmsh->mesh_path_root_timer,
 666                   round_jiffies(TU_TO_EXP_TIME(interval)));
 667 }
 668
 669 static int
 670 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 671 {
 672         struct beacon_data *bcn;
 673         int head_len, tail_len;
 674         struct sk_buff *skb;
 675         struct ieee80211_mgmt *mgmt;
 676         struct ieee80211_chanctx_conf *chanctx_conf;
 677         struct mesh_csa_settings *csa;
 678         enum ieee80211_band band;
 679         u8 *pos;
 680         struct ieee80211_sub_if_data *sdata;
 681         int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
 682                       sizeof(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 Swith Parameters */
 695                    2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
 696                    2 + 8 + /* supported rates */
 697                    2 + 3; /* DS params */
 698         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 699                    2 + sizeof(struct ieee80211_ht_cap) +
 700                    2 + sizeof(struct ieee80211_ht_operation) +
 701                    2 + ifmsh->mesh_id_len +
 702                    2 + sizeof(struct ieee80211_meshconf_ie) +
 703                    2 + sizeof(__le16) + /* awake window */
 704                    2 + sizeof(struct ieee80211_vht_cap) +
 705                    2 + sizeof(struct ieee80211_vht_operation) +
 706                    ifmsh->ie_len;
 707
 708         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
 709         /* need an skb for IE builders to operate on */
 710         skb = dev_alloc_skb(max(head_len, tail_len));
 711
 712         if (!bcn || !skb)
 713                 goto out_free;
 714
 715         /*
 716          * pointers go into the block we allocated,
 717          * memory is | beacon_data | head | tail |
 718          */
 719         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
 720
 721         /* fill in the head */
 722         mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
 723         memset(mgmt, 0, hdr_len);
 724         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 725                                           IEEE80211_STYPE_BEACON);
 726         eth_broadcast_addr(mgmt->da);
 727         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 728         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 729         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
 730         mgmt->u.beacon.beacon_int =
 731                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
 732         mgmt->u.beacon.capab_info |= cpu_to_le16(
 733                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
 734
 735         pos = skb_put(skb, 2);
 736         *pos++ = WLAN_EID_SSID;
 737         *pos++ = 0x0;
 738
 739         rcu_read_lock();
 740         csa = rcu_dereference(ifmsh->csa);
 741         if (csa) {
 742                 pos = skb_put(skb, 13);
 743                 memset(pos, 0, 13);
 744                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 745                 *pos++ = 3;
 746                 *pos++ = 0x0;
 747                 *pos++ = ieee80211_frequency_to_channel(
 748                                 csa->settings.chandef.chan->center_freq);
 749                 bcn->csa_current_counter = csa->settings.count;
 750                 bcn->csa_counter_offsets[0] = hdr_len + 6;
 751                 *pos++ = csa->settings.count;
 752                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
 753                 *pos++ = 6;
 754                 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
 755                         *pos++ = ifmsh->mshcfg.dot11MeshTTL;
 756                         *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
 757                 } else {
 758                         *pos++ = ifmsh->chsw_ttl;
 759                 }
 760                 *pos++ |= csa->settings.block_tx ?
 761                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
 762                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
 763                 pos += 2;
 764                 put_unaligned_le16(ifmsh->pre_value, pos);
 765                 pos += 2;
 766         }
 767         rcu_read_unlock();
 768
 769         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
 770             mesh_add_ds_params_ie(sdata, skb))
 771                 goto out_free;
 772
 773         bcn->head_len = skb->len;
 774         memcpy(bcn->head, skb->data, bcn->head_len);
 775
 776         /* now the tail */
 777         skb_trim(skb, 0);
 778         bcn->tail = bcn->head + bcn->head_len;
 779
 780         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
 781             mesh_add_rsn_ie(sdata, skb) ||
 782             mesh_add_ht_cap_ie(sdata, skb) ||
 783             mesh_add_ht_oper_ie(sdata, skb) ||
 784             mesh_add_meshid_ie(sdata, skb) ||
 785             mesh_add_meshconf_ie(sdata, skb) ||
 786             mesh_add_awake_window_ie(sdata, skb) ||
 787             mesh_add_vht_cap_ie(sdata, skb) ||
 788             mesh_add_vht_oper_ie(sdata, skb) ||
 789             mesh_add_vendor_ies(sdata, skb))
 790                 goto out_free;
 791
 792         bcn->tail_len = skb->len;
 793         memcpy(bcn->tail, skb->data, bcn->tail_len);
 794         bcn->meshconf = (struct ieee80211_meshconf_ie *)
 795                                         (bcn->tail + ifmsh->meshconf_offset);
 796
 797         dev_kfree_skb(skb);
 798         rcu_assign_pointer(ifmsh->beacon, bcn);
 799         return 0;
 800 out_free:
 801         kfree(bcn);
 802         dev_kfree_skb(skb);
 803         return -ENOMEM;
 804 }
 805
 806 static int
 807 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
 808 {
 809         struct beacon_data *old_bcn;
 810         int ret;
 811
 812         old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
 813                                             lockdep_is_held(&sdata->wdev.mtx));
 814         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
 815         if (ret)
 816                 /* just reuse old beacon */
 817                 return ret;
 818
 819         if (old_bcn)
 820                 kfree_rcu(old_bcn, rcu_head);
 821         return 0;
 822 }
 823
 824 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 825                                        u32 changed)
 826 {
 827         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 828         unsigned long bits = changed;
 829         u32 bit;
 830
 831         if (!bits)
 832                 return;
 833
 834         /* if we race with running work, worst case this work becomes a noop */
 835         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
 836                 set_bit(bit, &ifmsh->mbss_changed);
 837         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
 838         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 839 }
 840
 841 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 842 {
 843         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 844         struct ieee80211_local *local = sdata->local;
 845         u32 changed = BSS_CHANGED_BEACON |
 846                       BSS_CHANGED_BEACON_ENABLED |
 847                       BSS_CHANGED_HT |
 848                       BSS_CHANGED_BASIC_RATES |
 849                       BSS_CHANGED_BEACON_INT;
 850
 851         local->fif_other_bss++;
 852         /* mesh ifaces must set allmulti to forward mcast traffic */
 853         atomic_inc(&local->iff_allmultis);
 854         ieee80211_configure_filter(local);
 855
 856         ifmsh->mesh_cc_id = 0;  /* Disabled */
 857         /* register sync ops from extensible synchronization framework */
 858         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 859         ifmsh->adjusting_tbtt = false;
 860         ifmsh->sync_offset_clockdrift_max = 0;
 861         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 862         ieee80211_mesh_root_setup(ifmsh);
 863         ieee80211_queue_work(&local->hw, &sdata->work);
 864         sdata->vif.bss_conf.ht_operation_mode =
 865                                 ifmsh->mshcfg.ht_opmode;
 866         sdata->vif.bss_conf.enable_beacon = true;
 867
 868         changed |= ieee80211_mps_local_status_update(sdata);
 869
 870         if (ieee80211_mesh_build_beacon(ifmsh)) {
 871                 ieee80211_stop_mesh(sdata);
 872                 return -ENOMEM;
 873         }
 874
 875         ieee80211_recalc_dtim(local, sdata);
 876         ieee80211_bss_info_change_notify(sdata, changed);
 877
 878         netif_carrier_on(sdata->dev);
 879         return 0;
 880 }
 881
 882 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 883 {
 884         struct ieee80211_local *local = sdata->local;
 885         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 886         struct beacon_data *bcn;
 887
 888         netif_carrier_off(sdata->dev);
 889
 890         /* stop the beacon */
 891         ifmsh->mesh_id_len = 0;
 892         sdata->vif.bss_conf.enable_beacon = false;
 893         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 894         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 895         bcn = rcu_dereference_protected(ifmsh->beacon,
 896                                         lockdep_is_held(&sdata->wdev.mtx));
 897         RCU_INIT_POINTER(ifmsh->beacon, NULL);
 898         kfree_rcu(bcn, rcu_head);
 899
 900         /* flush STAs and mpaths on this iface */
 901         sta_info_flush(sdata);
 902         mesh_path_flush_by_iface(sdata);
 903         mesh_pathtbl_unregister(sdata);
 904
 905         /* free all potentially still buffered group-addressed frames */
 906         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
 907         skb_queue_purge(&ifmsh->ps.bc_buf);
 908
 909         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 910         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 911         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 912
 913         /* clear any mesh work (for next join) we may have accrued */
 914         ifmsh->wrkq_flags = 0;
 915         ifmsh->mbss_changed = 0;
 916
 917         local->fif_other_bss--;
 918         atomic_dec(&local->iff_allmultis);
 919         ieee80211_configure_filter(local);
 920 }
 921
 922 static bool
 923 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
 924                                  struct ieee802_11_elems *elems, bool beacon)
 925 {
 926         struct cfg80211_csa_settings params;
 927         struct ieee80211_csa_ie csa_ie;
 928         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 929         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 930         int err;
 931         u32 sta_flags;
 932
 933         sdata_assert_lock(sdata);
 934
 935         sta_flags = IEEE80211_STA_DISABLE_VHT;
 936         switch (sdata->vif.bss_conf.chandef.width) {
 937         case NL80211_CHAN_WIDTH_20_NOHT:
 938                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 939         case NL80211_CHAN_WIDTH_20:
 940                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 941                 break;
 942         default:
 943                 break;
 944         }
 945
 946         memset(&params, 0, sizeof(params));
 947         memset(&csa_ie, 0, sizeof(csa_ie));
 948         err = ieee80211_parse_ch_switch_ie(sdata, elems, band,
 949                                            sta_flags, sdata->vif.addr,
 950                                            &csa_ie);
 951         if (err < 0)
 952                 return false;
 953         if (err)
 954                 return false;
 955
 956         params.chandef = csa_ie.chandef;
 957         params.count = csa_ie.count;
 958
 959         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
 960                                      IEEE80211_CHAN_DISABLED)) {
 961                 sdata_info(sdata,
 962                            "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
 963                            sdata->vif.addr,
 964                            params.chandef.chan->center_freq,
 965                            params.chandef.width,
 966                            params.chandef.center_freq1,
 967                            params.chandef.center_freq2);
 968                 return false;
 969         }
 970
 971         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 972                                             &params.chandef,
 973                                             NL80211_IFTYPE_MESH_POINT);
 974         if (err < 0)
 975                 return false;
 976         if (err > 0)
 977                 /* TODO: DFS not (yet) supported */
 978                 return false;
 979
 980         params.radar_required = err;
 981
 982         if (cfg80211_chandef_identical(&params.chandef,
 983                                        &sdata->vif.bss_conf.chandef)) {
 984                 mcsa_dbg(sdata,
 985                          "received csa with an identical chandef, ignoring\n");
 986                 return true;
 987         }
 988
 989         mcsa_dbg(sdata,
 990                  "received channel switch announcement to go to channel %d MHz\n",
 991                  params.chandef.chan->center_freq);
 992
 993         params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
 994         if (beacon) {
 995                 ifmsh->chsw_ttl = csa_ie.ttl - 1;
 996                 if (ifmsh->pre_value >= csa_ie.pre_value)
 997                         return false;
 998                 ifmsh->pre_value = csa_ie.pre_value;
 999         }
1000
1001         if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1002                 return false;
1003
1004         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1005
1006         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1007                                      &params) < 0)
1008                 return false;
1009
1010         return true;
1011 }
1012
1013 static void
1014 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1015                             struct ieee80211_mgmt *mgmt, size_t len)
1016 {
1017         struct ieee80211_local *local = sdata->local;
1018         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1019         struct sk_buff *presp;
1020         struct beacon_data *bcn;
1021         struct ieee80211_mgmt *hdr;
1022         struct ieee802_11_elems elems;
1023         size_t baselen;
1024         u8 *pos;
1025
1026         pos = mgmt->u.probe_req.variable;
1027         baselen = (u8 *) pos - (u8 *) mgmt;
1028         if (baselen > len)
1029                 return;
1030
1031         ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1032
1033         if (!elems.mesh_id)
1034                 return;
1035
1036         /* 802.11-2012 10.1.4.3.2 */
1037         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1038              !is_broadcast_ether_addr(mgmt->da)) ||
1039             elems.ssid_len != 0)
1040                 return;
1041
1042         if (elems.mesh_id_len != 0 &&
1043             (elems.mesh_id_len != ifmsh->mesh_id_len ||
1044              memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1045                 return;
1046
1047         rcu_read_lock();
1048         bcn = rcu_dereference(ifmsh->beacon);
1049
1050         if (!bcn)
1051                 goto out;
1052
1053         presp = dev_alloc_skb(local->tx_headroom +
1054                               bcn->head_len + bcn->tail_len);
1055         if (!presp)
1056                 goto out;
1057
1058         skb_reserve(presp, local->tx_headroom);
1059         memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
1060         memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
1061         hdr = (struct ieee80211_mgmt *) presp->data;
1062         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1063                                          IEEE80211_STYPE_PROBE_RESP);
1064         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1065         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1066         ieee80211_tx_skb(sdata, presp);
1067 out:
1068         rcu_read_unlock();
1069 }
1070
1071 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1072                                         u16 stype,
1073                                         struct ieee80211_mgmt *mgmt,
1074                                         size_t len,
1075                                         struct ieee80211_rx_status *rx_status)
1076 {
1077         struct ieee80211_local *local = sdata->local;
1078         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1079         struct ieee802_11_elems elems;
1080         struct ieee80211_channel *channel;
1081         size_t baselen;
1082         int freq;
1083         enum ieee80211_band band = rx_status->band;
1084
1085         /* ignore ProbeResp to foreign address */
1086         if (stype == IEEE80211_STYPE_PROBE_RESP &&
1087             !ether_addr_equal(mgmt->da, sdata->vif.addr))
1088                 return;
1089
1090         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1091         if (baselen > len)
1092                 return;
1093
1094         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1095                                false, &elems);
1096
1097         /* ignore non-mesh or secure / unsecure mismatch */
1098         if ((!elems.mesh_id || !elems.mesh_config) ||
1099             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1100             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1101                 return;
1102
1103         if (elems.ds_params)
1104                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1105         else
1106                 freq = rx_status->freq;
1107
1108         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1109
1110         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1111                 return;
1112
1113         if (mesh_matches_local(sdata, &elems))
1114                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
1115
1116         if (ifmsh->sync_ops)
1117                 ifmsh->sync_ops->rx_bcn_presp(sdata,
1118                         stype, mgmt, &elems, rx_status);
1119
1120         if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1121             !sdata->vif.csa_active)
1122                 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1123 }
1124
1125 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1126 {
1127         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1128         struct mesh_csa_settings *tmp_csa_settings;
1129         int ret = 0;
1130         int changed = 0;
1131
1132         /* Reset the TTL value and Initiator flag */
1133         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1134         ifmsh->chsw_ttl = 0;
1135
1136         /* Remove the CSA and MCSP elements from the beacon */
1137         tmp_csa_settings = rcu_dereference(ifmsh->csa);
1138         RCU_INIT_POINTER(ifmsh->csa, NULL);
1139         if (tmp_csa_settings)
1140                 kfree_rcu(tmp_csa_settings, rcu_head);
1141         ret = ieee80211_mesh_rebuild_beacon(sdata);
1142         if (ret)
1143                 return -EINVAL;
1144
1145         changed |= BSS_CHANGED_BEACON;
1146
1147         mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1148                  sdata->vif.bss_conf.chandef.chan->center_freq);
1149         return changed;
1150 }
1151
1152 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1153                               struct cfg80211_csa_settings *csa_settings)
1154 {
1155         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1156         struct mesh_csa_settings *tmp_csa_settings;
1157         int ret = 0;
1158
1159         tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1160                                    GFP_ATOMIC);
1161         if (!tmp_csa_settings)
1162                 return -ENOMEM;
1163
1164         memcpy(&tmp_csa_settings->settings, csa_settings,
1165                sizeof(struct cfg80211_csa_settings));
1166
1167         rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1168
1169         ret = ieee80211_mesh_rebuild_beacon(sdata);
1170         if (ret) {
1171                 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1172                 RCU_INIT_POINTER(ifmsh->csa, NULL);
1173                 kfree_rcu(tmp_csa_settings, rcu_head);
1174                 return ret;
1175         }
1176
1177         return BSS_CHANGED_BEACON;
1178 }
1179
1180 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1181                                struct ieee80211_mgmt *mgmt, size_t len)
1182 {
1183         struct ieee80211_mgmt *mgmt_fwd;
1184         struct sk_buff *skb;
1185         struct ieee80211_local *local = sdata->local;
1186         u8 *pos = mgmt->u.action.u.chan_switch.variable;
1187         size_t offset_ttl;
1188
1189         skb = dev_alloc_skb(local->tx_headroom + len);
1190         if (!skb)
1191                 return -ENOMEM;
1192         skb_reserve(skb, local->tx_headroom);
1193         mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
1194
1195         /* offset_ttl is based on whether the secondary channel
1196          * offset is available or not. Subtract 1 from the mesh TTL
1197          * and disable the initiator flag before forwarding.
1198          */
1199         offset_ttl = (len < 42) ? 7 : 10;
1200         *(pos + offset_ttl) -= 1;
1201         *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1202
1203         memcpy(mgmt_fwd, mgmt, len);
1204         eth_broadcast_addr(mgmt_fwd->da);
1205         memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1206         memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1207
1208         ieee80211_tx_skb(sdata, skb);
1209         return 0;
1210 }
1211
1212 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1213                               struct ieee80211_mgmt *mgmt, size_t len)
1214 {
1215         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1216         struct ieee802_11_elems elems;
1217         u16 pre_value;
1218         bool fwd_csa = true;
1219         size_t baselen;
1220         u8 *pos;
1221
1222         if (mgmt->u.action.u.measurement.action_code !=
1223             WLAN_ACTION_SPCT_CHL_SWITCH)
1224                 return;
1225
1226         pos = mgmt->u.action.u.chan_switch.variable;
1227         baselen = offsetof(struct ieee80211_mgmt,
1228                            u.action.u.chan_switch.variable);
1229         ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1230
1231         ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1232         if (!--ifmsh->chsw_ttl)
1233                 fwd_csa = false;
1234
1235         pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1236         if (ifmsh->pre_value >= pre_value)
1237                 return;
1238
1239         ifmsh->pre_value = pre_value;
1240
1241         if (!sdata->vif.csa_active &&
1242             !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1243                 mcsa_dbg(sdata, "Failed to process CSA action frame");
1244                 return;
1245         }
1246
1247         /* forward or re-broadcast the CSA frame */
1248         if (fwd_csa) {
1249                 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
1250                         mcsa_dbg(sdata, "Failed to forward the CSA frame");
1251         }
1252 }
1253
1254 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1255                                           struct ieee80211_mgmt *mgmt,
1256                                           size_t len,
1257                                           struct ieee80211_rx_status *rx_status)
1258 {
1259         switch (mgmt->u.action.category) {
1260         case WLAN_CATEGORY_SELF_PROTECTED:
1261                 switch (mgmt->u.action.u.self_prot.action_code) {
1262                 case WLAN_SP_MESH_PEERING_OPEN:
1263                 case WLAN_SP_MESH_PEERING_CLOSE:
1264                 case WLAN_SP_MESH_PEERING_CONFIRM:
1265                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1266                         break;
1267                 }
1268                 break;
1269         case WLAN_CATEGORY_MESH_ACTION:
1270                 if (mesh_action_is_path_sel(mgmt))
1271                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1272                 break;
1273         case WLAN_CATEGORY_SPECTRUM_MGMT:
1274                 mesh_rx_csa_frame(sdata, mgmt, len);
1275                 break;
1276         }
1277 }
1278
1279 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1280                                    struct sk_buff *skb)
1281 {
1282         struct ieee80211_rx_status *rx_status;
1283         struct ieee80211_mgmt *mgmt;
1284         u16 stype;
1285
1286         sdata_lock(sdata);
1287
1288         /* mesh already went down */
1289         if (!sdata->u.mesh.mesh_id_len)
1290                 goto out;
1291
1292         rx_status = IEEE80211_SKB_RXCB(skb);
1293         mgmt = (struct ieee80211_mgmt *) skb->data;
1294         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1295
1296         switch (stype) {
1297         case IEEE80211_STYPE_PROBE_RESP:
1298         case IEEE80211_STYPE_BEACON:
1299                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1300                                             rx_status);
1301                 break;
1302         case IEEE80211_STYPE_PROBE_REQ:
1303                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1304                 break;
1305         case IEEE80211_STYPE_ACTION:
1306                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1307                 break;
1308         }
1309 out:
1310         sdata_unlock(sdata);
1311 }
1312
1313 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1314 {
1315         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1316         u32 bit, changed = 0;
1317
1318         for_each_set_bit(bit, &ifmsh->mbss_changed,
1319                          sizeof(changed) * BITS_PER_BYTE) {
1320                 clear_bit(bit, &ifmsh->mbss_changed);
1321                 changed |= BIT(bit);
1322         }
1323
1324         if (sdata->vif.bss_conf.enable_beacon &&
1325             (changed & (BSS_CHANGED_BEACON |
1326                         BSS_CHANGED_HT |
1327                         BSS_CHANGED_BASIC_RATES |
1328                         BSS_CHANGED_BEACON_INT)))
1329                 if (ieee80211_mesh_rebuild_beacon(sdata))
1330                         return;
1331
1332         ieee80211_bss_info_change_notify(sdata, changed);
1333 }
1334
1335 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1336 {
1337         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1338
1339         sdata_lock(sdata);
1340
1341         /* mesh already went down */
1342         if (!sdata->u.mesh.mesh_id_len)
1343                 goto out;
1344
1345         if (ifmsh->preq_queue_len &&
1346             time_after(jiffies,
1347                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1348                 mesh_path_start_discovery(sdata);
1349
1350         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
1351                 mesh_mpath_table_grow(sdata);
1352
1353         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
1354                 mesh_mpp_table_grow(sdata);
1355
1356         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1357                 ieee80211_mesh_housekeeping(sdata);
1358
1359         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1360                 ieee80211_mesh_rootpath(sdata);
1361
1362         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1363                 mesh_sync_adjust_tbtt(sdata);
1364
1365         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1366                 mesh_bss_info_changed(sdata);
1367 out:
1368         sdata_unlock(sdata);
1369 }
1370
1371
1372 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1373 {
1374         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1375         static u8 zero_addr[ETH_ALEN] = {};
1376
1377         setup_timer(&ifmsh->housekeeping_timer,
1378                     ieee80211_mesh_housekeeping_timer,
1379                     (unsigned long) sdata);
1380
1381         ifmsh->accepting_plinks = true;
1382         atomic_set(&ifmsh->mpaths, 0);
1383         mesh_rmc_init(sdata);
1384         ifmsh->last_preq = jiffies;
1385         ifmsh->next_perr = jiffies;
1386         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1387         /* Allocate all mesh structures when creating the first mesh interface. */
1388         if (!mesh_allocated)
1389                 ieee80211s_init();
1390
1391         mesh_pathtbl_init(sdata);
1392
1393         setup_timer(&ifmsh->mesh_path_timer,
1394                     ieee80211_mesh_path_timer,
1395                     (unsigned long) sdata);
1396         setup_timer(&ifmsh->mesh_path_root_timer,
1397                     ieee80211_mesh_path_root_timer,
1398                     (unsigned long) sdata);
1399         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1400         skb_queue_head_init(&ifmsh->ps.bc_buf);
1401         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1402         spin_lock_init(&ifmsh->sync_offset_lock);
1403         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1404
1405         sdata->vif.bss_conf.bssid = zero_addr;
1406 }