net/mac80211/mesh_plink.c

   1 /*
   2  * Copyright (c) 2008, 2009 open80211s Ltd.
   3  * Author:     Luis Carlos Cobo <luisca@cozybit.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9 #include <linux/gfp.h>
  10 #include <linux/kernel.h>
  11 #include <linux/random.h>
  12 #include <linux/rculist.h>
  13
  14 #include "ieee80211_i.h"
  15 #include "rate.h"
  16 #include "mesh.h"
  17
  18 #define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
  19 #define PLINK_GET_LLID(p) (p + 2)
  20 #define PLINK_GET_PLID(p) (p + 4)
  21
  22 #define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
  23                                 jiffies + msecs_to_jiffies(t)))
  24
  25 enum plink_event {
  26         PLINK_UNDEFINED,
  27         OPN_ACPT,
  28         OPN_RJCT,
  29         OPN_IGNR,
  30         CNF_ACPT,
  31         CNF_RJCT,
  32         CNF_IGNR,
  33         CLS_ACPT,
  34         CLS_IGNR
  35 };
  36
  37 static const char * const mplstates[] = {
  38         [NL80211_PLINK_LISTEN] = "LISTEN",
  39         [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
  40         [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
  41         [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
  42         [NL80211_PLINK_ESTAB] = "ESTAB",
  43         [NL80211_PLINK_HOLDING] = "HOLDING",
  44         [NL80211_PLINK_BLOCKED] = "BLOCKED"
  45 };
  46
  47 static const char * const mplevents[] = {
  48         [PLINK_UNDEFINED] = "NONE",
  49         [OPN_ACPT] = "OPN_ACPT",
  50         [OPN_RJCT] = "OPN_RJCT",
  51         [OPN_IGNR] = "OPN_IGNR",
  52         [CNF_ACPT] = "CNF_ACPT",
  53         [CNF_RJCT] = "CNF_RJCT",
  54         [CNF_IGNR] = "CNF_IGNR",
  55         [CLS_ACPT] = "CLS_ACPT",
  56         [CLS_IGNR] = "CLS_IGNR"
  57 };
  58
  59 /* We only need a valid sta if user configured a minimum rssi_threshold. */
  60 static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
  61                                  struct sta_info *sta)
  62 {
  63         s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
  64         return rssi_threshold == 0 ||
  65                (sta &&
  66                 (s8)-ewma_signal_read(&sta->rx_stats_avg.signal) >
  67                                                 rssi_threshold);
  68 }
  69
  70 /**
  71  * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
  72  *
  73  * @sta: mesh peer link to restart
  74  *
  75  * Locking: this function must be called holding sta->mesh->plink_lock
  76  */
  77 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
  78 {
  79         lockdep_assert_held(&sta->mesh->plink_lock);
  80         sta->mesh->plink_state = NL80211_PLINK_LISTEN;
  81         sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
  82         sta->mesh->plink_retries = 0;
  83 }
  84
  85 /*
  86  * mesh_set_short_slot_time - enable / disable ERP short slot time.
  87  *
  88  * The standard indirectly mandates mesh STAs to turn off short slot time by
  89  * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
  90  * can't be sneaky about it. Enable short slot time if all mesh STAs in the
  91  * MBSS support ERP rates.
  92  *
  93  * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
  94  */
  95 static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
  96 {
  97         struct ieee80211_local *local = sdata->local;
  98         struct ieee80211_supported_band *sband;
  99         struct sta_info *sta;
 100         u32 erp_rates = 0, changed = 0;
 101         int i;
 102         bool short_slot = false;
 103
 104         sband = ieee80211_get_sband(sdata);
 105         if (!sband)
 106                 return changed;
 107
 108         if (sband->band == NL80211_BAND_5GHZ) {
 109                 /* (IEEE 802.11-2012 19.4.5) */
 110                 short_slot = true;
 111                 goto out;
 112         } else if (sband->band != NL80211_BAND_2GHZ) {
 113                 goto out;
 114         }
 115
 116         for (i = 0; i < sband->n_bitrates; i++)
 117                 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
 118                         erp_rates |= BIT(i);
 119
 120         if (!erp_rates)
 121                 goto out;
 122
 123         rcu_read_lock();
 124         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 125                 if (sdata != sta->sdata ||
 126                     sta->mesh->plink_state != NL80211_PLINK_ESTAB)
 127                         continue;
 128
 129                 short_slot = false;
 130                 if (erp_rates & sta->sta.supp_rates[sband->band])
 131                         short_slot = true;
 132                  else
 133                         break;
 134         }
 135         rcu_read_unlock();
 136
 137 out:
 138         if (sdata->vif.bss_conf.use_short_slot != short_slot) {
 139                 sdata->vif.bss_conf.use_short_slot = short_slot;
 140                 changed = BSS_CHANGED_ERP_SLOT;
 141                 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
 142                         sdata->vif.addr, short_slot);
 143         }
 144         return changed;
 145 }
 146
 147 /**
 148  * mesh_set_ht_prot_mode - set correct HT protection mode
 149  *
 150  * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
 151  * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
 152  * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
 153  * selected if any non-HT peers are present in our MBSS.  20MHz-protection mode
 154  * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
 155  * HT20 peer is present. Otherwise no-protection mode is selected.
 156  */
 157 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
 158 {
 159         struct ieee80211_local *local = sdata->local;
 160         struct sta_info *sta;
 161         u16 ht_opmode;
 162         bool non_ht_sta = false, ht20_sta = false;
 163
 164         switch (sdata->vif.bss_conf.chandef.width) {
 165         case NL80211_CHAN_WIDTH_20_NOHT:
 166         case NL80211_CHAN_WIDTH_5:
 167         case NL80211_CHAN_WIDTH_10:
 168                 return 0;
 169         default:
 170                 break;
 171         }
 172
 173         rcu_read_lock();
 174         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 175                 if (sdata != sta->sdata ||
 176                     sta->mesh->plink_state != NL80211_PLINK_ESTAB)
 177                         continue;
 178
 179                 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
 180                         continue;
 181
 182                 if (!sta->sta.ht_cap.ht_supported) {
 183                         mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
 184                                        sta->sta.addr);
 185                         non_ht_sta = true;
 186                         break;
 187                 }
 188
 189                 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
 190                 ht20_sta = true;
 191         }
 192         rcu_read_unlock();
 193
 194         if (non_ht_sta)
 195                 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
 196         else if (ht20_sta &&
 197                  sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
 198                 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
 199         else
 200                 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
 201
 202         if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
 203                 return 0;
 204
 205         sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 206         sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
 207         mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
 208         return BSS_CHANGED_HT;
 209 }
 210
 211 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
 212                                struct sta_info *sta,
 213                                enum ieee80211_self_protected_actioncode action,
 214                                u8 *da, u16 llid, u16 plid, u16 reason)
 215 {
 216         struct ieee80211_local *local = sdata->local;
 217         struct sk_buff *skb;
 218         struct ieee80211_tx_info *info;
 219         struct ieee80211_mgmt *mgmt;
 220         bool include_plid = false;
 221         u16 peering_proto = 0;
 222         u8 *pos, ie_len = 4;
 223         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
 224                       sizeof(mgmt->u.action.u.self_prot);
 225         int err = -ENOMEM;
 226
 227         skb = dev_alloc_skb(local->tx_headroom +
 228                             hdr_len +
 229                             2 + /* capability info */
 230                             2 + /* AID */
 231                             2 + 8 + /* supported rates */
 232                             2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 233                             2 + sdata->u.mesh.mesh_id_len +
 234                             2 + sizeof(struct ieee80211_meshconf_ie) +
 235                             2 + sizeof(struct ieee80211_ht_cap) +
 236                             2 + sizeof(struct ieee80211_ht_operation) +
 237                             2 + sizeof(struct ieee80211_vht_cap) +
 238                             2 + sizeof(struct ieee80211_vht_operation) +
 239                             2 + 8 + /* peering IE */
 240                             sdata->u.mesh.ie_len);
 241         if (!skb)
 242                 return err;
 243         info = IEEE80211_SKB_CB(skb);
 244         skb_reserve(skb, local->tx_headroom);
 245         mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
 246         memset(mgmt, 0, hdr_len);
 247         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 248                                           IEEE80211_STYPE_ACTION);
 249         memcpy(mgmt->da, da, ETH_ALEN);
 250         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 251         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 252         mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
 253         mgmt->u.action.u.self_prot.action_code = action;
 254
 255         if (action != WLAN_SP_MESH_PEERING_CLOSE) {
 256                 struct ieee80211_supported_band *sband;
 257                 enum nl80211_band band;
 258
 259                 sband = ieee80211_get_sband(sdata);
 260                 if (!sband) {
 261                         err = -EINVAL;
 262                         goto free;
 263                 }
 264                 band = sband->band;
 265
 266                 /* capability info */
 267                 pos = skb_put(skb, 2);
 268                 memset(pos, 0, 2);
 269                 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
 270                         /* AID */
 271                         pos = skb_put(skb, 2);
 272                         put_unaligned_le16(sta->sta.aid, pos);
 273                 }
 274                 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
 275                     ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
 276                     mesh_add_rsn_ie(sdata, skb) ||
 277                     mesh_add_meshid_ie(sdata, skb) ||
 278                     mesh_add_meshconf_ie(sdata, skb))
 279                         goto free;
 280         } else {        /* WLAN_SP_MESH_PEERING_CLOSE */
 281                 info->flags |= IEEE80211_TX_CTL_NO_ACK;
 282                 if (mesh_add_meshid_ie(sdata, skb))
 283                         goto free;
 284         }
 285
 286         /* Add Mesh Peering Management element */
 287         switch (action) {
 288         case WLAN_SP_MESH_PEERING_OPEN:
 289                 break;
 290         case WLAN_SP_MESH_PEERING_CONFIRM:
 291                 ie_len += 2;
 292                 include_plid = true;
 293                 break;
 294         case WLAN_SP_MESH_PEERING_CLOSE:
 295                 if (plid) {
 296                         ie_len += 2;
 297                         include_plid = true;
 298                 }
 299                 ie_len += 2;    /* reason code */
 300                 break;
 301         default:
 302                 err = -EINVAL;
 303                 goto free;
 304         }
 305
 306         if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
 307                 goto free;
 308
 309         pos = skb_put(skb, 2 + ie_len);
 310         *pos++ = WLAN_EID_PEER_MGMT;
 311         *pos++ = ie_len;
 312         memcpy(pos, &peering_proto, 2);
 313         pos += 2;
 314         put_unaligned_le16(llid, pos);
 315         pos += 2;
 316         if (include_plid) {
 317                 put_unaligned_le16(plid, pos);
 318                 pos += 2;
 319         }
 320         if (action == WLAN_SP_MESH_PEERING_CLOSE) {
 321                 put_unaligned_le16(reason, pos);
 322                 pos += 2;
 323         }
 324
 325         if (action != WLAN_SP_MESH_PEERING_CLOSE) {
 326                 if (mesh_add_ht_cap_ie(sdata, skb) ||
 327                     mesh_add_ht_oper_ie(sdata, skb) ||
 328                     mesh_add_vht_cap_ie(sdata, skb) ||
 329                     mesh_add_vht_oper_ie(sdata, skb))
 330                         goto free;
 331         }
 332
 333         if (mesh_add_vendor_ies(sdata, skb))
 334                 goto free;
 335
 336         ieee80211_tx_skb(sdata, skb);
 337         return 0;
 338 free:
 339         kfree_skb(skb);
 340         return err;
 341 }
 342
 343 /**
 344  * __mesh_plink_deactivate - deactivate mesh peer link
 345  *
 346  * @sta: mesh peer link to deactivate
 347  *
 348  * Mesh paths with this peer as next hop should be flushed
 349  * by the caller outside of plink_lock.
 350  *
 351  * Returns beacon changed flag if the beacon content changed.
 352  *
 353  * Locking: the caller must hold sta->mesh->plink_lock
 354  */
 355 static u32 __mesh_plink_deactivate(struct sta_info *sta)
 356 {
 357         struct ieee80211_sub_if_data *sdata = sta->sdata;
 358         u32 changed = 0;
 359
 360         lockdep_assert_held(&sta->mesh->plink_lock);
 361
 362         if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
 363                 changed = mesh_plink_dec_estab_count(sdata);
 364         sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
 365
 366         ieee80211_mps_sta_status_update(sta);
 367         changed |= ieee80211_mps_set_sta_local_pm(sta,
 368                         NL80211_MESH_POWER_UNKNOWN);
 369
 370         return changed;
 371 }
 372
 373 /**
 374  * mesh_plink_deactivate - deactivate mesh peer link
 375  *
 376  * @sta: mesh peer link to deactivate
 377  *
 378  * All mesh paths with this peer as next hop will be flushed
 379  */
 380 u32 mesh_plink_deactivate(struct sta_info *sta)
 381 {
 382         struct ieee80211_sub_if_data *sdata = sta->sdata;
 383         u32 changed;
 384
 385         spin_lock_bh(&sta->mesh->plink_lock);
 386         changed = __mesh_plink_deactivate(sta);
 387
 388         if (!sdata->u.mesh.user_mpm) {
 389                 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
 390                 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
 391                                     sta->sta.addr, sta->mesh->llid,
 392                                     sta->mesh->plid, sta->mesh->reason);
 393         }
 394         spin_unlock_bh(&sta->mesh->plink_lock);
 395         if (!sdata->u.mesh.user_mpm)
 396                 del_timer_sync(&sta->mesh->plink_timer);
 397         mesh_path_flush_by_nexthop(sta);
 398
 399         /* make sure no readers can access nexthop sta from here on */
 400         synchronize_net();
 401
 402         return changed;
 403 }
 404
 405 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
 406                                struct sta_info *sta,
 407                                struct ieee802_11_elems *elems, bool insert)
 408 {
 409         struct ieee80211_local *local = sdata->local;
 410         struct ieee80211_supported_band *sband;
 411         u32 rates, basic_rates = 0, changed = 0;
 412         enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
 413
 414         sband = ieee80211_get_sband(sdata);
 415         if (!sband)
 416                 return;
 417
 418         rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
 419                                         &basic_rates);
 420
 421         spin_lock_bh(&sta->mesh->plink_lock);
 422         sta->rx_stats.last_rx = jiffies;
 423
 424         /* rates and capabilities don't change during peering */
 425         if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
 426             sta->mesh->processed_beacon)
 427                 goto out;
 428         sta->mesh->processed_beacon = true;
 429
 430         if (sta->sta.supp_rates[sband->band] != rates)
 431                 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
 432         sta->sta.supp_rates[sband->band] = rates;
 433
 434         if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
 435                                               elems->ht_cap_elem, sta))
 436                 changed |= IEEE80211_RC_BW_CHANGED;
 437
 438         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
 439                                             elems->vht_cap_elem, sta);
 440
 441         if (bw != sta->sta.bandwidth)
 442                 changed |= IEEE80211_RC_BW_CHANGED;
 443
 444         /* HT peer is operating 20MHz-only */
 445         if (elems->ht_operation &&
 446             !(elems->ht_operation->ht_param &
 447               IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 448                 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
 449                         changed |= IEEE80211_RC_BW_CHANGED;
 450                 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
 451         }
 452
 453         if (insert)
 454                 rate_control_rate_init(sta);
 455         else
 456                 rate_control_rate_update(local, sband, sta, changed);
 457 out:
 458         spin_unlock_bh(&sta->mesh->plink_lock);
 459 }
 460
 461 static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
 462 {
 463         struct sta_info *sta;
 464         unsigned long *aid_map;
 465         int aid;
 466
 467         aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
 468                           sizeof(*aid_map), GFP_KERNEL);
 469         if (!aid_map)
 470                 return -ENOMEM;
 471
 472         /* reserve aid 0 for mcast indication */
 473         __set_bit(0, aid_map);
 474
 475         rcu_read_lock();
 476         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
 477                 __set_bit(sta->sta.aid, aid_map);
 478         rcu_read_unlock();
 479
 480         aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
 481         kfree(aid_map);
 482
 483         if (aid > IEEE80211_MAX_AID)
 484                 return -ENOBUFS;
 485
 486         return aid;
 487 }
 488
 489 static struct sta_info *
 490 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
 491 {
 492         struct sta_info *sta;
 493         int aid;
 494
 495         if (sdata->local->num_sta >= MESH_MAX_PLINKS)
 496                 return NULL;
 497
 498         aid = mesh_allocate_aid(sdata);
 499         if (aid < 0)
 500                 return NULL;
 501
 502         sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
 503         if (!sta)
 504                 return NULL;
 505
 506         sta->mesh->plink_state = NL80211_PLINK_LISTEN;
 507         sta->sta.wme = true;
 508         sta->sta.aid = aid;
 509
 510         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 511         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 512         sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 513
 514         return sta;
 515 }
 516
 517 static struct sta_info *
 518 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
 519                     struct ieee802_11_elems *elems)
 520 {
 521         struct sta_info *sta = NULL;
 522
 523         /* Userspace handles station allocation */
 524         if (sdata->u.mesh.user_mpm ||
 525             sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
 526                 if (mesh_peer_accepts_plinks(elems) &&
 527                     mesh_plink_availables(sdata))
 528                         cfg80211_notify_new_peer_candidate(sdata->dev, addr,
 529                                                            elems->ie_start,
 530                                                            elems->total_len,
 531                                                            GFP_KERNEL);
 532         } else
 533                 sta = __mesh_sta_info_alloc(sdata, addr);
 534
 535         return sta;
 536 }
 537
 538 /*
 539  * mesh_sta_info_get - return mesh sta info entry for @addr.
 540  *
 541  * @sdata: local meshif
 542  * @addr: peer's address
 543  * @elems: IEs from beacon or mesh peering frame.
 544  *
 545  * Return existing or newly allocated sta_info under RCU read lock.
 546  * (re)initialize with given IEs.
 547  */
 548 static struct sta_info *
 549 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
 550                   u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
 551 {
 552         struct sta_info *sta = NULL;
 553
 554         rcu_read_lock();
 555         sta = sta_info_get(sdata, addr);
 556         if (sta) {
 557                 mesh_sta_info_init(sdata, sta, elems, false);
 558         } else {
 559                 rcu_read_unlock();
 560                 /* can't run atomic */
 561                 sta = mesh_sta_info_alloc(sdata, addr, elems);
 562                 if (!sta) {
 563                         rcu_read_lock();
 564                         return NULL;
 565                 }
 566
 567                 mesh_sta_info_init(sdata, sta, elems, true);
 568
 569                 if (sta_info_insert_rcu(sta))
 570                         return NULL;
 571         }
 572
 573         return sta;
 574 }
 575
 576 /*
 577  * mesh_neighbour_update - update or initialize new mesh neighbor.
 578  *
 579  * @sdata: local meshif
 580  * @addr: peer's address
 581  * @elems: IEs from beacon or mesh peering frame
 582  *
 583  * Initiates peering if appropriate.
 584  */
 585 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
 586                            u8 *hw_addr,
 587                            struct ieee802_11_elems *elems)
 588 {
 589         struct sta_info *sta;
 590         u32 changed = 0;
 591
 592         sta = mesh_sta_info_get(sdata, hw_addr, elems);
 593         if (!sta)
 594                 goto out;
 595
 596         if (mesh_peer_accepts_plinks(elems) &&
 597             sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
 598             sdata->u.mesh.accepting_plinks &&
 599             sdata->u.mesh.mshcfg.auto_open_plinks &&
 600             rssi_threshold_check(sdata, sta))
 601                 changed = mesh_plink_open(sta);
 602
 603         ieee80211_mps_frame_release(sta, elems);
 604 out:
 605         rcu_read_unlock();
 606         ieee80211_mbss_info_change_notify(sdata, changed);
 607 }
 608
 609 static void mesh_plink_timer(unsigned long data)
 610 {
 611         struct sta_info *sta;
 612         u16 reason = 0;
 613         struct ieee80211_sub_if_data *sdata;
 614         struct mesh_config *mshcfg;
 615         enum ieee80211_self_protected_actioncode action = 0;
 616
 617         /*
 618          * This STA is valid because sta_info_destroy() will
 619          * del_timer_sync() this timer after having made sure
 620          * it cannot be readded (by deleting the plink.)
 621          */
 622         sta = (struct sta_info *) data;
 623
 624         if (sta->sdata->local->quiescing)
 625                 return;
 626
 627         spin_lock_bh(&sta->mesh->plink_lock);
 628
 629         /* If a timer fires just before a state transition on another CPU,
 630          * we may have already extended the timeout and changed state by the
 631          * time we've acquired the lock and arrived  here.  In that case,
 632          * skip this timer and wait for the new one.
 633          */
 634         if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
 635                 mpl_dbg(sta->sdata,
 636                         "Ignoring timer for %pM in state %s (timer adjusted)",
 637                         sta->sta.addr, mplstates[sta->mesh->plink_state]);
 638                 spin_unlock_bh(&sta->mesh->plink_lock);
 639                 return;
 640         }
 641
 642         /* del_timer() and handler may race when entering these states */
 643         if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
 644             sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
 645                 mpl_dbg(sta->sdata,
 646                         "Ignoring timer for %pM in state %s (timer deleted)",
 647                         sta->sta.addr, mplstates[sta->mesh->plink_state]);
 648                 spin_unlock_bh(&sta->mesh->plink_lock);
 649                 return;
 650         }
 651
 652         mpl_dbg(sta->sdata,
 653                 "Mesh plink timer for %pM fired on state %s\n",
 654                 sta->sta.addr, mplstates[sta->mesh->plink_state]);
 655         sdata = sta->sdata;
 656         mshcfg = &sdata->u.mesh.mshcfg;
 657
 658         switch (sta->mesh->plink_state) {
 659         case NL80211_PLINK_OPN_RCVD:
 660         case NL80211_PLINK_OPN_SNT:
 661                 /* retry timer */
 662                 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
 663                         u32 rand;
 664                         mpl_dbg(sta->sdata,
 665                                 "Mesh plink for %pM (retry, timeout): %d %d\n",
 666                                 sta->sta.addr, sta->mesh->plink_retries,
 667                                 sta->mesh->plink_timeout);
 668                         get_random_bytes(&rand, sizeof(u32));
 669                         sta->mesh->plink_timeout = sta->mesh->plink_timeout +
 670                                              rand % sta->mesh->plink_timeout;
 671                         ++sta->mesh->plink_retries;
 672                         mod_plink_timer(sta, sta->mesh->plink_timeout);
 673                         action = WLAN_SP_MESH_PEERING_OPEN;
 674                         break;
 675                 }
 676                 reason = WLAN_REASON_MESH_MAX_RETRIES;
 677                 /* fall through on else */
 678         case NL80211_PLINK_CNF_RCVD:
 679                 /* confirm timer */
 680                 if (!reason)
 681                         reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
 682                 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
 683                 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
 684                 action = WLAN_SP_MESH_PEERING_CLOSE;
 685                 break;
 686         case NL80211_PLINK_HOLDING:
 687                 /* holding timer */
 688                 del_timer(&sta->mesh->plink_timer);
 689                 mesh_plink_fsm_restart(sta);
 690                 break;
 691         default:
 692                 break;
 693         }
 694         spin_unlock_bh(&sta->mesh->plink_lock);
 695         if (action)
 696                 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
 697                                     sta->mesh->llid, sta->mesh->plid, reason);
 698 }
 699
 700 static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
 701 {
 702         sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
 703         sta->mesh->plink_timer.data = (unsigned long) sta;
 704         sta->mesh->plink_timer.function = mesh_plink_timer;
 705         sta->mesh->plink_timeout = timeout;
 706         add_timer(&sta->mesh->plink_timer);
 707 }
 708
 709 static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
 710                         u16 llid)
 711 {
 712         struct ieee80211_local *local = sdata->local;
 713         bool in_use = false;
 714         struct sta_info *sta;
 715
 716         rcu_read_lock();
 717         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 718                 if (sdata != sta->sdata)
 719                         continue;
 720
 721                 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
 722                         in_use = true;
 723                         break;
 724                 }
 725         }
 726         rcu_read_unlock();
 727
 728         return in_use;
 729 }
 730
 731 static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
 732 {
 733         u16 llid;
 734
 735         do {
 736                 get_random_bytes(&llid, sizeof(llid));
 737         } while (llid_in_use(sdata, llid));
 738
 739         return llid;
 740 }
 741
 742 u32 mesh_plink_open(struct sta_info *sta)
 743 {
 744         struct ieee80211_sub_if_data *sdata = sta->sdata;
 745         u32 changed;
 746
 747         if (!test_sta_flag(sta, WLAN_STA_AUTH))
 748                 return 0;
 749
 750         spin_lock_bh(&sta->mesh->plink_lock);
 751         sta->mesh->llid = mesh_get_new_llid(sdata);
 752         if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
 753             sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
 754                 spin_unlock_bh(&sta->mesh->plink_lock);
 755                 return 0;
 756         }
 757         sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
 758         mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
 759         spin_unlock_bh(&sta->mesh->plink_lock);
 760         mpl_dbg(sdata,
 761                 "Mesh plink: starting establishment with %pM\n",
 762                 sta->sta.addr);
 763
 764         /* set the non-peer mode to active during peering */
 765         changed = ieee80211_mps_local_status_update(sdata);
 766
 767         mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
 768                             sta->sta.addr, sta->mesh->llid, 0, 0);
 769         return changed;
 770 }
 771
 772 u32 mesh_plink_block(struct sta_info *sta)
 773 {
 774         u32 changed;
 775
 776         spin_lock_bh(&sta->mesh->plink_lock);
 777         changed = __mesh_plink_deactivate(sta);
 778         sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
 779         spin_unlock_bh(&sta->mesh->plink_lock);
 780         mesh_path_flush_by_nexthop(sta);
 781
 782         return changed;
 783 }
 784
 785 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
 786                              struct sta_info *sta,
 787                              enum plink_event event)
 788 {
 789         struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
 790         u16 reason = (event == CLS_ACPT) ?
 791                      WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
 792
 793         sta->mesh->reason = reason;
 794         sta->mesh->plink_state = NL80211_PLINK_HOLDING;
 795         mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
 796 }
 797
 798 static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
 799                                 struct sta_info *sta)
 800 {
 801         struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
 802         u32 changed = 0;
 803
 804         del_timer(&sta->mesh->plink_timer);
 805         sta->mesh->plink_state = NL80211_PLINK_ESTAB;
 806         changed |= mesh_plink_inc_estab_count(sdata);
 807         changed |= mesh_set_ht_prot_mode(sdata);
 808         changed |= mesh_set_short_slot_time(sdata);
 809         mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
 810         ieee80211_mps_sta_status_update(sta);
 811         changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
 812         return changed;
 813 }
 814
 815 /**
 816  * mesh_plink_fsm - step @sta MPM based on @event
 817  *
 818  * @sdata: interface
 819  * @sta: mesh neighbor
 820  * @event: peering event
 821  *
 822  * Return: changed MBSS flags
 823  */
 824 static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
 825                           struct sta_info *sta, enum plink_event event)
 826 {
 827         struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
 828         enum ieee80211_self_protected_actioncode action = 0;
 829         u32 changed = 0;
 830         bool flush = false;
 831
 832         mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
 833                 mplstates[sta->mesh->plink_state], mplevents[event]);
 834
 835         spin_lock_bh(&sta->mesh->plink_lock);
 836         switch (sta->mesh->plink_state) {
 837         case NL80211_PLINK_LISTEN:
 838                 switch (event) {
 839                 case CLS_ACPT:
 840                         mesh_plink_fsm_restart(sta);
 841                         break;
 842                 case OPN_ACPT:
 843                         sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
 844                         sta->mesh->llid = mesh_get_new_llid(sdata);
 845                         mesh_plink_timer_set(sta,
 846                                              mshcfg->dot11MeshRetryTimeout);
 847
 848                         /* set the non-peer mode to active during peering */
 849                         changed |= ieee80211_mps_local_status_update(sdata);
 850                         action = WLAN_SP_MESH_PEERING_OPEN;
 851                         break;
 852                 default:
 853                         break;
 854                 }
 855                 break;
 856         case NL80211_PLINK_OPN_SNT:
 857                 switch (event) {
 858                 case OPN_RJCT:
 859                 case CNF_RJCT:
 860                 case CLS_ACPT:
 861                         mesh_plink_close(sdata, sta, event);
 862                         action = WLAN_SP_MESH_PEERING_CLOSE;
 863                         break;
 864                 case OPN_ACPT:
 865                         /* retry timer is left untouched */
 866                         sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
 867                         action = WLAN_SP_MESH_PEERING_CONFIRM;
 868                         break;
 869                 case CNF_ACPT:
 870                         sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
 871                         mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
 872                         break;
 873                 default:
 874                         break;
 875                 }
 876                 break;
 877         case NL80211_PLINK_OPN_RCVD:
 878                 switch (event) {
 879                 case OPN_RJCT:
 880                 case CNF_RJCT:
 881                 case CLS_ACPT:
 882                         mesh_plink_close(sdata, sta, event);
 883                         action = WLAN_SP_MESH_PEERING_CLOSE;
 884                         break;
 885                 case OPN_ACPT:
 886                         action = WLAN_SP_MESH_PEERING_CONFIRM;
 887                         break;
 888                 case CNF_ACPT:
 889                         changed |= mesh_plink_establish(sdata, sta);
 890                         break;
 891                 default:
 892                         break;
 893                 }
 894                 break;
 895         case NL80211_PLINK_CNF_RCVD:
 896                 switch (event) {
 897                 case OPN_RJCT:
 898                 case CNF_RJCT:
 899                 case CLS_ACPT:
 900                         mesh_plink_close(sdata, sta, event);
 901                         action = WLAN_SP_MESH_PEERING_CLOSE;
 902                         break;
 903                 case OPN_ACPT:
 904                         changed |= mesh_plink_establish(sdata, sta);
 905                         action = WLAN_SP_MESH_PEERING_CONFIRM;
 906                         break;
 907                 default:
 908                         break;
 909                 }
 910                 break;
 911         case NL80211_PLINK_ESTAB:
 912                 switch (event) {
 913                 case CLS_ACPT:
 914                         changed |= __mesh_plink_deactivate(sta);
 915                         changed |= mesh_set_ht_prot_mode(sdata);
 916                         changed |= mesh_set_short_slot_time(sdata);
 917                         mesh_plink_close(sdata, sta, event);
 918                         action = WLAN_SP_MESH_PEERING_CLOSE;
 919                         flush = true;
 920                         break;
 921                 case OPN_ACPT:
 922                         action = WLAN_SP_MESH_PEERING_CONFIRM;
 923                         break;
 924                 default:
 925                         break;
 926                 }
 927                 break;
 928         case NL80211_PLINK_HOLDING:
 929                 switch (event) {
 930                 case CLS_ACPT:
 931                         del_timer(&sta->mesh->plink_timer);
 932                         mesh_plink_fsm_restart(sta);
 933                         break;
 934                 case OPN_ACPT:
 935                 case CNF_ACPT:
 936                 case OPN_RJCT:
 937                 case CNF_RJCT:
 938                         action = WLAN_SP_MESH_PEERING_CLOSE;
 939                         break;
 940                 default:
 941                         break;
 942                 }
 943                 break;
 944         default:
 945                 /* should not get here, PLINK_BLOCKED is dealt with at the
 946                  * beginning of the function
 947                  */
 948                 break;
 949         }
 950         spin_unlock_bh(&sta->mesh->plink_lock);
 951         if (flush)
 952                 mesh_path_flush_by_nexthop(sta);
 953         if (action) {
 954                 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
 955                                     sta->mesh->llid, sta->mesh->plid,
 956                                     sta->mesh->reason);
 957
 958                 /* also send confirm in open case */
 959                 if (action == WLAN_SP_MESH_PEERING_OPEN) {
 960                         mesh_plink_frame_tx(sdata, sta,
 961                                             WLAN_SP_MESH_PEERING_CONFIRM,
 962                                             sta->sta.addr, sta->mesh->llid,
 963                                             sta->mesh->plid, 0);
 964                 }
 965         }
 966
 967         return changed;
 968 }
 969
 970 /*
 971  * mesh_plink_get_event - get correct MPM event
 972  *
 973  * @sdata: interface
 974  * @sta: peer, leave NULL if processing a frame from a new suitable peer
 975  * @elems: peering management IEs
 976  * @ftype: frame type
 977  * @llid: peer's peer link ID
 978  * @plid: peer's local link ID
 979  *
 980  * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
 981  * an error.
 982  */
 983 static enum plink_event
 984 mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
 985                      struct sta_info *sta,
 986                      struct ieee802_11_elems *elems,
 987                      enum ieee80211_self_protected_actioncode ftype,
 988                      u16 llid, u16 plid)
 989 {
 990         enum plink_event event = PLINK_UNDEFINED;
 991         u8 ie_len = elems->peering_len;
 992         bool matches_local;
 993
 994         matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
 995                          mesh_matches_local(sdata, elems));
 996
 997         /* deny open request from non-matching peer */
 998         if (!matches_local && !sta) {
 999                 event = OPN_RJCT;
1000                 goto out;
1001         }
1002
1003         if (!sta) {
1004                 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1005                         mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1006                         goto out;
1007                 }
1008                 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1009                 if (!mesh_plink_free_count(sdata)) {
1010                         mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1011                         goto out;
1012                 }
1013
1014                 /* new matching peer */
1015                 event = OPN_ACPT;
1016                 goto out;
1017         } else {
1018                 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1019                         mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1020                         goto out;
1021                 }
1022                 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
1023                         goto out;
1024         }
1025
1026         switch (ftype) {
1027         case WLAN_SP_MESH_PEERING_OPEN:
1028                 if (!matches_local)
1029                         event = OPN_RJCT;
1030                 if (!mesh_plink_free_count(sdata) ||
1031                     (sta->mesh->plid && sta->mesh->plid != plid))
1032                         event = OPN_IGNR;
1033                 else
1034                         event = OPN_ACPT;
1035                 break;
1036         case WLAN_SP_MESH_PEERING_CONFIRM:
1037                 if (!matches_local)
1038                         event = CNF_RJCT;
1039                 if (!mesh_plink_free_count(sdata) ||
1040                     sta->mesh->llid != llid ||
1041                     (sta->mesh->plid && sta->mesh->plid != plid))
1042                         event = CNF_IGNR;
1043                 else
1044                         event = CNF_ACPT;
1045                 break;
1046         case WLAN_SP_MESH_PEERING_CLOSE:
1047                 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1048                         /* Do not check for llid or plid. This does not
1049                          * follow the standard but since multiple plinks
1050                          * per sta are not supported, it is necessary in
1051                          * order to avoid a livelock when MP A sees an
1052                          * establish peer link to MP B but MP B does not
1053                          * see it. This can be caused by a timeout in
1054                          * B's peer link establishment or B beign
1055                          * restarted.
1056                          */
1057                         event = CLS_ACPT;
1058                 else if (sta->mesh->plid != plid)
1059                         event = CLS_IGNR;
1060                 else if (ie_len == 8 && sta->mesh->llid != llid)
1061                         event = CLS_IGNR;
1062                 else
1063                         event = CLS_ACPT;
1064                 break;
1065         default:
1066                 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1067                 break;
1068         }
1069
1070 out:
1071         return event;
1072 }
1073
1074 static void
1075 mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1076                          struct ieee80211_mgmt *mgmt,
1077                          struct ieee802_11_elems *elems)
1078 {
1079
1080         struct sta_info *sta;
1081         enum plink_event event;
1082         enum ieee80211_self_protected_actioncode ftype;
1083         u32 changed = 0;
1084         u8 ie_len = elems->peering_len;
1085         u16 plid, llid = 0;
1086
1087         if (!elems->peering) {
1088                 mpl_dbg(sdata,
1089                         "Mesh plink: missing necessary peer link ie\n");
1090                 return;
1091         }
1092
1093         if (elems->rsn_len &&
1094             sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1095                 mpl_dbg(sdata,
1096                         "Mesh plink: can't establish link with secure peer\n");
1097                 return;
1098         }
1099
1100         ftype = mgmt->u.action.u.self_prot.action_code;
1101         if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1102             (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1103             (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1104                                                         && ie_len != 8)) {
1105                 mpl_dbg(sdata,
1106                         "Mesh plink: incorrect plink ie length %d %d\n",
1107                         ftype, ie_len);
1108                 return;
1109         }
1110
1111         if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1112             (!elems->mesh_id || !elems->mesh_config)) {
1113                 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1114                 return;
1115         }
1116         /* Note the lines below are correct, the llid in the frame is the plid
1117          * from the point of view of this host.
1118          */
1119         plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1120         if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1121             (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1122                 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1123
1124         /* WARNING: Only for sta pointer, is dropped & re-acquired */
1125         rcu_read_lock();
1126
1127         sta = sta_info_get(sdata, mgmt->sa);
1128
1129         if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1130             !rssi_threshold_check(sdata, sta)) {
1131                 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1132                         mgmt->sa);
1133                 goto unlock_rcu;
1134         }
1135
1136         /* Now we will figure out the appropriate event... */
1137         event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1138
1139         if (event == OPN_ACPT) {
1140                 rcu_read_unlock();
1141                 /* allocate sta entry if necessary and update info */
1142                 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
1143                 if (!sta) {
1144                         mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1145                         goto unlock_rcu;
1146                 }
1147                 sta->mesh->plid = plid;
1148         } else if (!sta && event == OPN_RJCT) {
1149                 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1150                                     mgmt->sa, 0, plid,
1151                                     WLAN_REASON_MESH_CONFIG);
1152                 goto unlock_rcu;
1153         } else if (!sta || event == PLINK_UNDEFINED) {
1154                 /* something went wrong */
1155                 goto unlock_rcu;
1156         }
1157
1158         if (event == CNF_ACPT) {
1159                 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1160                 if (!sta->mesh->plid)
1161                         sta->mesh->plid = plid;
1162
1163                 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1164         }
1165
1166         changed |= mesh_plink_fsm(sdata, sta, event);
1167
1168 unlock_rcu:
1169         rcu_read_unlock();
1170
1171         if (changed)
1172                 ieee80211_mbss_info_change_notify(sdata, changed);
1173 }
1174
1175 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1176                          struct ieee80211_mgmt *mgmt, size_t len,
1177                          struct ieee80211_rx_status *rx_status)
1178 {
1179         struct ieee802_11_elems elems;
1180         size_t baselen;
1181         u8 *baseaddr;
1182
1183         /* need action_code, aux */
1184         if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1185                 return;
1186
1187         if (sdata->u.mesh.user_mpm)
1188                 /* userspace must register for these */
1189                 return;
1190
1191         if (is_multicast_ether_addr(mgmt->da)) {
1192                 mpl_dbg(sdata,
1193                         "Mesh plink: ignore frame from multicast address\n");
1194                 return;
1195         }
1196
1197         baseaddr = mgmt->u.action.u.self_prot.variable;
1198         baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1199         if (mgmt->u.action.u.self_prot.action_code ==
1200                                                 WLAN_SP_MESH_PEERING_CONFIRM) {
1201                 baseaddr += 4;
1202                 baselen += 4;
1203
1204                 if (baselen > len)
1205                         return;
1206         }
1207         ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1208         mesh_process_plink_frame(sdata, mgmt, &elems);
1209 }