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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (c) 2008, 2009 open80211s Ltd.
0004  * Copyright (C) 2019, 2021-2022 Intel Corporation
0005  * Author:     Luis Carlos Cobo <luisca@cozybit.com>
0006  */
0007 #include <linux/gfp.h>
0008 #include <linux/kernel.h>
0009 #include <linux/random.h>
0010 #include <linux/rculist.h>
0011 
0012 #include "ieee80211_i.h"
0013 #include "rate.h"
0014 #include "mesh.h"
0015 
0016 #define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
0017 #define PLINK_GET_LLID(p) (p + 2)
0018 #define PLINK_GET_PLID(p) (p + 4)
0019 
0020 #define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
0021                 jiffies + msecs_to_jiffies(t)))
0022 
0023 enum plink_event {
0024     PLINK_UNDEFINED,
0025     OPN_ACPT,
0026     OPN_RJCT,
0027     OPN_IGNR,
0028     CNF_ACPT,
0029     CNF_RJCT,
0030     CNF_IGNR,
0031     CLS_ACPT,
0032     CLS_IGNR
0033 };
0034 
0035 static const char * const mplstates[] = {
0036     [NL80211_PLINK_LISTEN] = "LISTEN",
0037     [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
0038     [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
0039     [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
0040     [NL80211_PLINK_ESTAB] = "ESTAB",
0041     [NL80211_PLINK_HOLDING] = "HOLDING",
0042     [NL80211_PLINK_BLOCKED] = "BLOCKED"
0043 };
0044 
0045 static const char * const mplevents[] = {
0046     [PLINK_UNDEFINED] = "NONE",
0047     [OPN_ACPT] = "OPN_ACPT",
0048     [OPN_RJCT] = "OPN_RJCT",
0049     [OPN_IGNR] = "OPN_IGNR",
0050     [CNF_ACPT] = "CNF_ACPT",
0051     [CNF_RJCT] = "CNF_RJCT",
0052     [CNF_IGNR] = "CNF_IGNR",
0053     [CLS_ACPT] = "CLS_ACPT",
0054     [CLS_IGNR] = "CLS_IGNR"
0055 };
0056 
0057 /* We only need a valid sta if user configured a minimum rssi_threshold. */
0058 static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
0059                  struct sta_info *sta)
0060 {
0061     s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
0062     return rssi_threshold == 0 ||
0063            (sta &&
0064         (s8)-ewma_signal_read(&sta->deflink.rx_stats_avg.signal) >
0065         rssi_threshold);
0066 }
0067 
0068 /**
0069  * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
0070  *
0071  * @sta: mesh peer link to restart
0072  *
0073  * Locking: this function must be called holding sta->mesh->plink_lock
0074  */
0075 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
0076 {
0077     lockdep_assert_held(&sta->mesh->plink_lock);
0078     sta->mesh->plink_state = NL80211_PLINK_LISTEN;
0079     sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
0080     sta->mesh->plink_retries = 0;
0081 }
0082 
0083 /*
0084  * mesh_set_short_slot_time - enable / disable ERP short slot time.
0085  *
0086  * The standard indirectly mandates mesh STAs to turn off short slot time by
0087  * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
0088  * can't be sneaky about it. Enable short slot time if all mesh STAs in the
0089  * MBSS support ERP rates.
0090  *
0091  * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
0092  */
0093 static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
0094 {
0095     struct ieee80211_local *local = sdata->local;
0096     struct ieee80211_supported_band *sband;
0097     struct sta_info *sta;
0098     u32 erp_rates = 0, changed = 0;
0099     int i;
0100     bool short_slot = false;
0101 
0102     sband = ieee80211_get_sband(sdata);
0103     if (!sband)
0104         return changed;
0105 
0106     if (sband->band == NL80211_BAND_5GHZ) {
0107         /* (IEEE 802.11-2012 19.4.5) */
0108         short_slot = true;
0109         goto out;
0110     } else if (sband->band != NL80211_BAND_2GHZ) {
0111         goto out;
0112     }
0113 
0114     for (i = 0; i < sband->n_bitrates; i++)
0115         if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
0116             erp_rates |= BIT(i);
0117 
0118     if (!erp_rates)
0119         goto out;
0120 
0121     rcu_read_lock();
0122     list_for_each_entry_rcu(sta, &local->sta_list, list) {
0123         if (sdata != sta->sdata ||
0124             sta->mesh->plink_state != NL80211_PLINK_ESTAB)
0125             continue;
0126 
0127         short_slot = false;
0128         if (erp_rates & sta->sta.deflink.supp_rates[sband->band])
0129             short_slot = true;
0130          else
0131             break;
0132     }
0133     rcu_read_unlock();
0134 
0135 out:
0136     if (sdata->vif.bss_conf.use_short_slot != short_slot) {
0137         sdata->vif.bss_conf.use_short_slot = short_slot;
0138         changed = BSS_CHANGED_ERP_SLOT;
0139         mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
0140             sdata->vif.addr, short_slot);
0141     }
0142     return changed;
0143 }
0144 
0145 /**
0146  * mesh_set_ht_prot_mode - set correct HT protection mode
0147  * @sdata: the (mesh) interface to handle
0148  *
0149  * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
0150  * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
0151  * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
0152  * selected if any non-HT peers are present in our MBSS.  20MHz-protection mode
0153  * is selected if all peers in our 20/40MHz MBSS support HT and at least one
0154  * HT20 peer is present. Otherwise no-protection mode is selected.
0155  */
0156 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
0157 {
0158     struct ieee80211_local *local = sdata->local;
0159     struct sta_info *sta;
0160     u16 ht_opmode;
0161     bool non_ht_sta = false, ht20_sta = false;
0162 
0163     switch (sdata->vif.bss_conf.chandef.width) {
0164     case NL80211_CHAN_WIDTH_20_NOHT:
0165     case NL80211_CHAN_WIDTH_5:
0166     case NL80211_CHAN_WIDTH_10:
0167         return 0;
0168     default:
0169         break;
0170     }
0171 
0172     rcu_read_lock();
0173     list_for_each_entry_rcu(sta, &local->sta_list, list) {
0174         if (sdata != sta->sdata ||
0175             sta->mesh->plink_state != NL80211_PLINK_ESTAB)
0176             continue;
0177 
0178         if (sta->sta.deflink.bandwidth > IEEE80211_STA_RX_BW_20)
0179             continue;
0180 
0181         if (!sta->sta.deflink.ht_cap.ht_supported) {
0182             mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
0183                        sta->sta.addr);
0184             non_ht_sta = true;
0185             break;
0186         }
0187 
0188         mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
0189         ht20_sta = true;
0190     }
0191     rcu_read_unlock();
0192 
0193     if (non_ht_sta)
0194         ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
0195     else if (ht20_sta &&
0196          sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
0197         ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
0198     else
0199         ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
0200 
0201     if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
0202         return 0;
0203 
0204     sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
0205     sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
0206     mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
0207     return BSS_CHANGED_HT;
0208 }
0209 
0210 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
0211                    struct sta_info *sta,
0212                    enum ieee80211_self_protected_actioncode action,
0213                    u8 *da, u16 llid, u16 plid, u16 reason)
0214 {
0215     struct ieee80211_local *local = sdata->local;
0216     struct sk_buff *skb;
0217     struct ieee80211_tx_info *info;
0218     struct ieee80211_mgmt *mgmt;
0219     bool include_plid = false;
0220     u16 peering_proto = 0;
0221     u8 *pos, ie_len = 4;
0222     u8 ie_len_he_cap;
0223     int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot);
0224     int err = -ENOMEM;
0225 
0226     ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
0227                         NL80211_IFTYPE_MESH_POINT);
0228     skb = dev_alloc_skb(local->tx_headroom +
0229                 hdr_len +
0230                 2 + /* capability info */
0231                 2 + /* AID */
0232                 2 + 8 + /* supported rates */
0233                 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
0234                 2 + sdata->u.mesh.mesh_id_len +
0235                 2 + sizeof(struct ieee80211_meshconf_ie) +
0236                 2 + sizeof(struct ieee80211_ht_cap) +
0237                 2 + sizeof(struct ieee80211_ht_operation) +
0238                 2 + sizeof(struct ieee80211_vht_cap) +
0239                 2 + sizeof(struct ieee80211_vht_operation) +
0240                 ie_len_he_cap +
0241                 2 + 1 + sizeof(struct ieee80211_he_operation) +
0242                     sizeof(struct ieee80211_he_6ghz_oper) +
0243                 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
0244                 2 + 8 + /* peering IE */
0245                 sdata->u.mesh.ie_len);
0246     if (!skb)
0247         return err;
0248     info = IEEE80211_SKB_CB(skb);
0249     skb_reserve(skb, local->tx_headroom);
0250     mgmt = skb_put_zero(skb, hdr_len);
0251     mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
0252                       IEEE80211_STYPE_ACTION);
0253     memcpy(mgmt->da, da, ETH_ALEN);
0254     memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
0255     memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
0256     mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
0257     mgmt->u.action.u.self_prot.action_code = action;
0258 
0259     if (action != WLAN_SP_MESH_PEERING_CLOSE) {
0260         struct ieee80211_supported_band *sband;
0261         enum nl80211_band band;
0262 
0263         sband = ieee80211_get_sband(sdata);
0264         if (!sband) {
0265             err = -EINVAL;
0266             goto free;
0267         }
0268         band = sband->band;
0269 
0270         /* capability info */
0271         pos = skb_put_zero(skb, 2);
0272         if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
0273             /* AID */
0274             pos = skb_put(skb, 2);
0275             put_unaligned_le16(sta->sta.aid, pos);
0276         }
0277         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
0278             ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
0279             mesh_add_rsn_ie(sdata, skb) ||
0280             mesh_add_meshid_ie(sdata, skb) ||
0281             mesh_add_meshconf_ie(sdata, skb))
0282             goto free;
0283     } else {    /* WLAN_SP_MESH_PEERING_CLOSE */
0284         info->flags |= IEEE80211_TX_CTL_NO_ACK;
0285         if (mesh_add_meshid_ie(sdata, skb))
0286             goto free;
0287     }
0288 
0289     /* Add Mesh Peering Management element */
0290     switch (action) {
0291     case WLAN_SP_MESH_PEERING_OPEN:
0292         break;
0293     case WLAN_SP_MESH_PEERING_CONFIRM:
0294         ie_len += 2;
0295         include_plid = true;
0296         break;
0297     case WLAN_SP_MESH_PEERING_CLOSE:
0298         if (plid) {
0299             ie_len += 2;
0300             include_plid = true;
0301         }
0302         ie_len += 2;    /* reason code */
0303         break;
0304     default:
0305         err = -EINVAL;
0306         goto free;
0307     }
0308 
0309     if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
0310         goto free;
0311 
0312     pos = skb_put(skb, 2 + ie_len);
0313     *pos++ = WLAN_EID_PEER_MGMT;
0314     *pos++ = ie_len;
0315     memcpy(pos, &peering_proto, 2);
0316     pos += 2;
0317     put_unaligned_le16(llid, pos);
0318     pos += 2;
0319     if (include_plid) {
0320         put_unaligned_le16(plid, pos);
0321         pos += 2;
0322     }
0323     if (action == WLAN_SP_MESH_PEERING_CLOSE) {
0324         put_unaligned_le16(reason, pos);
0325         pos += 2;
0326     }
0327 
0328     if (action != WLAN_SP_MESH_PEERING_CLOSE) {
0329         if (mesh_add_ht_cap_ie(sdata, skb) ||
0330             mesh_add_ht_oper_ie(sdata, skb) ||
0331             mesh_add_vht_cap_ie(sdata, skb) ||
0332             mesh_add_vht_oper_ie(sdata, skb) ||
0333             mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
0334             mesh_add_he_oper_ie(sdata, skb) ||
0335             mesh_add_he_6ghz_cap_ie(sdata, skb))
0336             goto free;
0337     }
0338 
0339     if (mesh_add_vendor_ies(sdata, skb))
0340         goto free;
0341 
0342     ieee80211_tx_skb(sdata, skb);
0343     return 0;
0344 free:
0345     kfree_skb(skb);
0346     return err;
0347 }
0348 
0349 /**
0350  * __mesh_plink_deactivate - deactivate mesh peer link
0351  *
0352  * @sta: mesh peer link to deactivate
0353  *
0354  * Mesh paths with this peer as next hop should be flushed
0355  * by the caller outside of plink_lock.
0356  *
0357  * Returns beacon changed flag if the beacon content changed.
0358  *
0359  * Locking: the caller must hold sta->mesh->plink_lock
0360  */
0361 static u32 __mesh_plink_deactivate(struct sta_info *sta)
0362 {
0363     struct ieee80211_sub_if_data *sdata = sta->sdata;
0364     u32 changed = 0;
0365 
0366     lockdep_assert_held(&sta->mesh->plink_lock);
0367 
0368     if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
0369         changed = mesh_plink_dec_estab_count(sdata);
0370     sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
0371 
0372     ieee80211_mps_sta_status_update(sta);
0373     changed |= ieee80211_mps_set_sta_local_pm(sta,
0374             NL80211_MESH_POWER_UNKNOWN);
0375 
0376     return changed;
0377 }
0378 
0379 /**
0380  * mesh_plink_deactivate - deactivate mesh peer link
0381  *
0382  * @sta: mesh peer link to deactivate
0383  *
0384  * All mesh paths with this peer as next hop will be flushed
0385  */
0386 u32 mesh_plink_deactivate(struct sta_info *sta)
0387 {
0388     struct ieee80211_sub_if_data *sdata = sta->sdata;
0389     u32 changed;
0390 
0391     spin_lock_bh(&sta->mesh->plink_lock);
0392     changed = __mesh_plink_deactivate(sta);
0393 
0394     if (!sdata->u.mesh.user_mpm) {
0395         sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
0396         mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
0397                     sta->sta.addr, sta->mesh->llid,
0398                     sta->mesh->plid, sta->mesh->reason);
0399     }
0400     spin_unlock_bh(&sta->mesh->plink_lock);
0401     if (!sdata->u.mesh.user_mpm)
0402         del_timer_sync(&sta->mesh->plink_timer);
0403     mesh_path_flush_by_nexthop(sta);
0404 
0405     /* make sure no readers can access nexthop sta from here on */
0406     synchronize_net();
0407 
0408     return changed;
0409 }
0410 
0411 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
0412                    struct sta_info *sta,
0413                    struct ieee802_11_elems *elems)
0414 {
0415     struct ieee80211_local *local = sdata->local;
0416     struct ieee80211_supported_band *sband;
0417     u32 rates, basic_rates = 0, changed = 0;
0418     enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
0419 
0420     sband = ieee80211_get_sband(sdata);
0421     if (!sband)
0422         return;
0423 
0424     rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
0425                     &basic_rates);
0426 
0427     spin_lock_bh(&sta->mesh->plink_lock);
0428     sta->deflink.rx_stats.last_rx = jiffies;
0429 
0430     /* rates and capabilities don't change during peering */
0431     if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
0432         sta->mesh->processed_beacon)
0433         goto out;
0434     sta->mesh->processed_beacon = true;
0435 
0436     if (sta->sta.deflink.supp_rates[sband->band] != rates)
0437         changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
0438     sta->sta.deflink.supp_rates[sband->band] = rates;
0439 
0440     if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
0441                           elems->ht_cap_elem,
0442                           &sta->deflink))
0443         changed |= IEEE80211_RC_BW_CHANGED;
0444 
0445     ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
0446                         elems->vht_cap_elem,
0447                         &sta->deflink);
0448 
0449     ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband, elems->he_cap,
0450                       elems->he_cap_len,
0451                       elems->he_6ghz_capa,
0452                       &sta->deflink);
0453 
0454     if (bw != sta->sta.deflink.bandwidth)
0455         changed |= IEEE80211_RC_BW_CHANGED;
0456 
0457     /* HT peer is operating 20MHz-only */
0458     if (elems->ht_operation &&
0459         !(elems->ht_operation->ht_param &
0460           IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
0461         if (sta->sta.deflink.bandwidth != IEEE80211_STA_RX_BW_20)
0462             changed |= IEEE80211_RC_BW_CHANGED;
0463         sta->sta.deflink.bandwidth = IEEE80211_STA_RX_BW_20;
0464     }
0465 
0466     if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
0467         rate_control_rate_init(sta);
0468     else
0469         rate_control_rate_update(local, sband, sta, 0, changed);
0470 out:
0471     spin_unlock_bh(&sta->mesh->plink_lock);
0472 }
0473 
0474 static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
0475 {
0476     struct sta_info *sta;
0477     unsigned long *aid_map;
0478     int aid;
0479 
0480     aid_map = bitmap_zalloc(IEEE80211_MAX_AID + 1, GFP_KERNEL);
0481     if (!aid_map)
0482         return -ENOMEM;
0483 
0484     /* reserve aid 0 for mcast indication */
0485     __set_bit(0, aid_map);
0486 
0487     rcu_read_lock();
0488     list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
0489         __set_bit(sta->sta.aid, aid_map);
0490     rcu_read_unlock();
0491 
0492     aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
0493     bitmap_free(aid_map);
0494 
0495     if (aid > IEEE80211_MAX_AID)
0496         return -ENOBUFS;
0497 
0498     return aid;
0499 }
0500 
0501 static struct sta_info *
0502 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
0503 {
0504     struct sta_info *sta;
0505     int aid;
0506 
0507     if (sdata->local->num_sta >= MESH_MAX_PLINKS)
0508         return NULL;
0509 
0510     aid = mesh_allocate_aid(sdata);
0511     if (aid < 0)
0512         return NULL;
0513 
0514     sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
0515     if (!sta)
0516         return NULL;
0517 
0518     sta->mesh->plink_state = NL80211_PLINK_LISTEN;
0519     sta->sta.wme = true;
0520     sta->sta.aid = aid;
0521 
0522     sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
0523     sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
0524     sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
0525 
0526     return sta;
0527 }
0528 
0529 static struct sta_info *
0530 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
0531             struct ieee802_11_elems *elems,
0532             struct ieee80211_rx_status *rx_status)
0533 {
0534     struct sta_info *sta = NULL;
0535 
0536     /* Userspace handles station allocation */
0537     if (sdata->u.mesh.user_mpm ||
0538         sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
0539         if (mesh_peer_accepts_plinks(elems) &&
0540             mesh_plink_availables(sdata)) {
0541             int sig = 0;
0542 
0543             if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM))
0544                 sig = rx_status->signal;
0545 
0546             cfg80211_notify_new_peer_candidate(sdata->dev, addr,
0547                                elems->ie_start,
0548                                elems->total_len,
0549                                sig, GFP_KERNEL);
0550         }
0551     } else
0552         sta = __mesh_sta_info_alloc(sdata, addr);
0553 
0554     return sta;
0555 }
0556 
0557 /*
0558  * mesh_sta_info_get - return mesh sta info entry for @addr.
0559  *
0560  * @sdata: local meshif
0561  * @addr: peer's address
0562  * @elems: IEs from beacon or mesh peering frame.
0563  * @rx_status: rx status for the frame for signal reporting
0564  *
0565  * Return existing or newly allocated sta_info under RCU read lock.
0566  * (re)initialize with given IEs.
0567  */
0568 static struct sta_info *
0569 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
0570           u8 *addr, struct ieee802_11_elems *elems,
0571           struct ieee80211_rx_status *rx_status) __acquires(RCU)
0572 {
0573     struct sta_info *sta = NULL;
0574 
0575     rcu_read_lock();
0576     sta = sta_info_get(sdata, addr);
0577     if (sta) {
0578         mesh_sta_info_init(sdata, sta, elems);
0579     } else {
0580         rcu_read_unlock();
0581         /* can't run atomic */
0582         sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status);
0583         if (!sta) {
0584             rcu_read_lock();
0585             return NULL;
0586         }
0587 
0588         mesh_sta_info_init(sdata, sta, elems);
0589 
0590         if (sta_info_insert_rcu(sta))
0591             return NULL;
0592     }
0593 
0594     return sta;
0595 }
0596 
0597 /*
0598  * mesh_neighbour_update - update or initialize new mesh neighbor.
0599  *
0600  * @sdata: local meshif
0601  * @addr: peer's address
0602  * @elems: IEs from beacon or mesh peering frame
0603  * @rx_status: rx status for the frame for signal reporting
0604  *
0605  * Initiates peering if appropriate.
0606  */
0607 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
0608                u8 *hw_addr,
0609                struct ieee802_11_elems *elems,
0610                struct ieee80211_rx_status *rx_status)
0611 {
0612     struct sta_info *sta;
0613     u32 changed = 0;
0614 
0615     sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status);
0616     if (!sta)
0617         goto out;
0618 
0619     sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form &
0620         IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE;
0621 
0622     if (mesh_peer_accepts_plinks(elems) &&
0623         sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
0624         sdata->u.mesh.accepting_plinks &&
0625         sdata->u.mesh.mshcfg.auto_open_plinks &&
0626         rssi_threshold_check(sdata, sta))
0627         changed = mesh_plink_open(sta);
0628 
0629     ieee80211_mps_frame_release(sta, elems);
0630 out:
0631     rcu_read_unlock();
0632     ieee80211_mbss_info_change_notify(sdata, changed);
0633 }
0634 
0635 void mesh_plink_timer(struct timer_list *t)
0636 {
0637     struct mesh_sta *mesh = from_timer(mesh, t, plink_timer);
0638     struct sta_info *sta;
0639     u16 reason = 0;
0640     struct ieee80211_sub_if_data *sdata;
0641     struct mesh_config *mshcfg;
0642     enum ieee80211_self_protected_actioncode action = 0;
0643 
0644     /*
0645      * This STA is valid because sta_info_destroy() will
0646      * del_timer_sync() this timer after having made sure
0647      * it cannot be readded (by deleting the plink.)
0648      */
0649     sta = mesh->plink_sta;
0650 
0651     if (sta->sdata->local->quiescing)
0652         return;
0653 
0654     spin_lock_bh(&sta->mesh->plink_lock);
0655 
0656     /* If a timer fires just before a state transition on another CPU,
0657      * we may have already extended the timeout and changed state by the
0658      * time we've acquired the lock and arrived  here.  In that case,
0659      * skip this timer and wait for the new one.
0660      */
0661     if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
0662         mpl_dbg(sta->sdata,
0663             "Ignoring timer for %pM in state %s (timer adjusted)",
0664             sta->sta.addr, mplstates[sta->mesh->plink_state]);
0665         spin_unlock_bh(&sta->mesh->plink_lock);
0666         return;
0667     }
0668 
0669     /* del_timer() and handler may race when entering these states */
0670     if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
0671         sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
0672         mpl_dbg(sta->sdata,
0673             "Ignoring timer for %pM in state %s (timer deleted)",
0674             sta->sta.addr, mplstates[sta->mesh->plink_state]);
0675         spin_unlock_bh(&sta->mesh->plink_lock);
0676         return;
0677     }
0678 
0679     mpl_dbg(sta->sdata,
0680         "Mesh plink timer for %pM fired on state %s\n",
0681         sta->sta.addr, mplstates[sta->mesh->plink_state]);
0682     sdata = sta->sdata;
0683     mshcfg = &sdata->u.mesh.mshcfg;
0684 
0685     switch (sta->mesh->plink_state) {
0686     case NL80211_PLINK_OPN_RCVD:
0687     case NL80211_PLINK_OPN_SNT:
0688         /* retry timer */
0689         if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
0690             u32 rand;
0691             mpl_dbg(sta->sdata,
0692                 "Mesh plink for %pM (retry, timeout): %d %d\n",
0693                 sta->sta.addr, sta->mesh->plink_retries,
0694                 sta->mesh->plink_timeout);
0695             get_random_bytes(&rand, sizeof(u32));
0696             sta->mesh->plink_timeout = sta->mesh->plink_timeout +
0697                          rand % sta->mesh->plink_timeout;
0698             ++sta->mesh->plink_retries;
0699             mod_plink_timer(sta, sta->mesh->plink_timeout);
0700             action = WLAN_SP_MESH_PEERING_OPEN;
0701             break;
0702         }
0703         reason = WLAN_REASON_MESH_MAX_RETRIES;
0704         fallthrough;
0705     case NL80211_PLINK_CNF_RCVD:
0706         /* confirm timer */
0707         if (!reason)
0708             reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
0709         sta->mesh->plink_state = NL80211_PLINK_HOLDING;
0710         mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
0711         action = WLAN_SP_MESH_PEERING_CLOSE;
0712         break;
0713     case NL80211_PLINK_HOLDING:
0714         /* holding timer */
0715         del_timer(&sta->mesh->plink_timer);
0716         mesh_plink_fsm_restart(sta);
0717         break;
0718     default:
0719         break;
0720     }
0721     spin_unlock_bh(&sta->mesh->plink_lock);
0722     if (action)
0723         mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
0724                     sta->mesh->llid, sta->mesh->plid, reason);
0725 }
0726 
0727 static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
0728 {
0729     sta->mesh->plink_timeout = timeout;
0730     mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout));
0731 }
0732 
0733 static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
0734             u16 llid)
0735 {
0736     struct ieee80211_local *local = sdata->local;
0737     bool in_use = false;
0738     struct sta_info *sta;
0739 
0740     rcu_read_lock();
0741     list_for_each_entry_rcu(sta, &local->sta_list, list) {
0742         if (sdata != sta->sdata)
0743             continue;
0744 
0745         if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
0746             in_use = true;
0747             break;
0748         }
0749     }
0750     rcu_read_unlock();
0751 
0752     return in_use;
0753 }
0754 
0755 static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
0756 {
0757     u16 llid;
0758 
0759     do {
0760         get_random_bytes(&llid, sizeof(llid));
0761     } while (llid_in_use(sdata, llid));
0762 
0763     return llid;
0764 }
0765 
0766 u32 mesh_plink_open(struct sta_info *sta)
0767 {
0768     struct ieee80211_sub_if_data *sdata = sta->sdata;
0769     u32 changed;
0770 
0771     if (!test_sta_flag(sta, WLAN_STA_AUTH))
0772         return 0;
0773 
0774     spin_lock_bh(&sta->mesh->plink_lock);
0775     sta->mesh->llid = mesh_get_new_llid(sdata);
0776     if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
0777         sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
0778         spin_unlock_bh(&sta->mesh->plink_lock);
0779         return 0;
0780     }
0781     sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
0782     mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
0783     spin_unlock_bh(&sta->mesh->plink_lock);
0784     mpl_dbg(sdata,
0785         "Mesh plink: starting establishment with %pM\n",
0786         sta->sta.addr);
0787 
0788     /* set the non-peer mode to active during peering */
0789     changed = ieee80211_mps_local_status_update(sdata);
0790 
0791     mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
0792                 sta->sta.addr, sta->mesh->llid, 0, 0);
0793     return changed;
0794 }
0795 
0796 u32 mesh_plink_block(struct sta_info *sta)
0797 {
0798     u32 changed;
0799 
0800     spin_lock_bh(&sta->mesh->plink_lock);
0801     changed = __mesh_plink_deactivate(sta);
0802     sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
0803     spin_unlock_bh(&sta->mesh->plink_lock);
0804     mesh_path_flush_by_nexthop(sta);
0805 
0806     return changed;
0807 }
0808 
0809 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
0810                  struct sta_info *sta,
0811                  enum plink_event event)
0812 {
0813     struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
0814     u16 reason = (event == CLS_ACPT) ?
0815              WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
0816 
0817     sta->mesh->reason = reason;
0818     sta->mesh->plink_state = NL80211_PLINK_HOLDING;
0819     mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
0820 }
0821 
0822 static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
0823                 struct sta_info *sta)
0824 {
0825     struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
0826     u32 changed = 0;
0827 
0828     del_timer(&sta->mesh->plink_timer);
0829     sta->mesh->plink_state = NL80211_PLINK_ESTAB;
0830     changed |= mesh_plink_inc_estab_count(sdata);
0831     changed |= mesh_set_ht_prot_mode(sdata);
0832     changed |= mesh_set_short_slot_time(sdata);
0833     mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
0834     ieee80211_mps_sta_status_update(sta);
0835     changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
0836     return changed;
0837 }
0838 
0839 /**
0840  * mesh_plink_fsm - step @sta MPM based on @event
0841  *
0842  * @sdata: interface
0843  * @sta: mesh neighbor
0844  * @event: peering event
0845  *
0846  * Return: changed MBSS flags
0847  */
0848 static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
0849               struct sta_info *sta, enum plink_event event)
0850 {
0851     struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
0852     enum ieee80211_self_protected_actioncode action = 0;
0853     u32 changed = 0;
0854     bool flush = false;
0855 
0856     mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
0857         mplstates[sta->mesh->plink_state], mplevents[event]);
0858 
0859     spin_lock_bh(&sta->mesh->plink_lock);
0860     switch (sta->mesh->plink_state) {
0861     case NL80211_PLINK_LISTEN:
0862         switch (event) {
0863         case CLS_ACPT:
0864             mesh_plink_fsm_restart(sta);
0865             break;
0866         case OPN_ACPT:
0867             sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
0868             sta->mesh->llid = mesh_get_new_llid(sdata);
0869             mesh_plink_timer_set(sta,
0870                          mshcfg->dot11MeshRetryTimeout);
0871 
0872             /* set the non-peer mode to active during peering */
0873             changed |= ieee80211_mps_local_status_update(sdata);
0874             action = WLAN_SP_MESH_PEERING_OPEN;
0875             break;
0876         default:
0877             break;
0878         }
0879         break;
0880     case NL80211_PLINK_OPN_SNT:
0881         switch (event) {
0882         case OPN_RJCT:
0883         case CNF_RJCT:
0884         case CLS_ACPT:
0885             mesh_plink_close(sdata, sta, event);
0886             action = WLAN_SP_MESH_PEERING_CLOSE;
0887             break;
0888         case OPN_ACPT:
0889             /* retry timer is left untouched */
0890             sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
0891             action = WLAN_SP_MESH_PEERING_CONFIRM;
0892             break;
0893         case CNF_ACPT:
0894             sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
0895             mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
0896             break;
0897         default:
0898             break;
0899         }
0900         break;
0901     case NL80211_PLINK_OPN_RCVD:
0902         switch (event) {
0903         case OPN_RJCT:
0904         case CNF_RJCT:
0905         case CLS_ACPT:
0906             mesh_plink_close(sdata, sta, event);
0907             action = WLAN_SP_MESH_PEERING_CLOSE;
0908             break;
0909         case OPN_ACPT:
0910             action = WLAN_SP_MESH_PEERING_CONFIRM;
0911             break;
0912         case CNF_ACPT:
0913             changed |= mesh_plink_establish(sdata, sta);
0914             break;
0915         default:
0916             break;
0917         }
0918         break;
0919     case NL80211_PLINK_CNF_RCVD:
0920         switch (event) {
0921         case OPN_RJCT:
0922         case CNF_RJCT:
0923         case CLS_ACPT:
0924             mesh_plink_close(sdata, sta, event);
0925             action = WLAN_SP_MESH_PEERING_CLOSE;
0926             break;
0927         case OPN_ACPT:
0928             changed |= mesh_plink_establish(sdata, sta);
0929             action = WLAN_SP_MESH_PEERING_CONFIRM;
0930             break;
0931         default:
0932             break;
0933         }
0934         break;
0935     case NL80211_PLINK_ESTAB:
0936         switch (event) {
0937         case CLS_ACPT:
0938             changed |= __mesh_plink_deactivate(sta);
0939             changed |= mesh_set_ht_prot_mode(sdata);
0940             changed |= mesh_set_short_slot_time(sdata);
0941             mesh_plink_close(sdata, sta, event);
0942             action = WLAN_SP_MESH_PEERING_CLOSE;
0943             flush = true;
0944             break;
0945         case OPN_ACPT:
0946             action = WLAN_SP_MESH_PEERING_CONFIRM;
0947             break;
0948         default:
0949             break;
0950         }
0951         break;
0952     case NL80211_PLINK_HOLDING:
0953         switch (event) {
0954         case CLS_ACPT:
0955             del_timer(&sta->mesh->plink_timer);
0956             mesh_plink_fsm_restart(sta);
0957             break;
0958         case OPN_ACPT:
0959         case CNF_ACPT:
0960         case OPN_RJCT:
0961         case CNF_RJCT:
0962             action = WLAN_SP_MESH_PEERING_CLOSE;
0963             break;
0964         default:
0965             break;
0966         }
0967         break;
0968     default:
0969         /* should not get here, PLINK_BLOCKED is dealt with at the
0970          * beginning of the function
0971          */
0972         break;
0973     }
0974     spin_unlock_bh(&sta->mesh->plink_lock);
0975     if (flush)
0976         mesh_path_flush_by_nexthop(sta);
0977     if (action) {
0978         mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
0979                     sta->mesh->llid, sta->mesh->plid,
0980                     sta->mesh->reason);
0981 
0982         /* also send confirm in open case */
0983         if (action == WLAN_SP_MESH_PEERING_OPEN) {
0984             mesh_plink_frame_tx(sdata, sta,
0985                         WLAN_SP_MESH_PEERING_CONFIRM,
0986                         sta->sta.addr, sta->mesh->llid,
0987                         sta->mesh->plid, 0);
0988         }
0989     }
0990 
0991     return changed;
0992 }
0993 
0994 /*
0995  * mesh_plink_get_event - get correct MPM event
0996  *
0997  * @sdata: interface
0998  * @sta: peer, leave NULL if processing a frame from a new suitable peer
0999  * @elems: peering management IEs
1000  * @ftype: frame type
1001  * @llid: peer's peer link ID
1002  * @plid: peer's local link ID
1003  *
1004  * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
1005  * an error.
1006  */
1007 static enum plink_event
1008 mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
1009              struct sta_info *sta,
1010              struct ieee802_11_elems *elems,
1011              enum ieee80211_self_protected_actioncode ftype,
1012              u16 llid, u16 plid)
1013 {
1014     enum plink_event event = PLINK_UNDEFINED;
1015     u8 ie_len = elems->peering_len;
1016     bool matches_local;
1017 
1018     matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
1019              mesh_matches_local(sdata, elems));
1020 
1021     /* deny open request from non-matching peer */
1022     if (!matches_local && !sta) {
1023         event = OPN_RJCT;
1024         goto out;
1025     }
1026 
1027     if (!sta) {
1028         if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1029             mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1030             goto out;
1031         }
1032         /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1033         if (!mesh_plink_free_count(sdata)) {
1034             mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1035             goto out;
1036         }
1037 
1038         /* new matching peer */
1039         event = OPN_ACPT;
1040         goto out;
1041     } else {
1042         if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1043             mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1044             goto out;
1045         }
1046         if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
1047             goto out;
1048     }
1049 
1050     switch (ftype) {
1051     case WLAN_SP_MESH_PEERING_OPEN:
1052         if (!matches_local)
1053             event = OPN_RJCT;
1054         if (!mesh_plink_free_count(sdata) ||
1055             (sta->mesh->plid && sta->mesh->plid != plid))
1056             event = OPN_IGNR;
1057         else
1058             event = OPN_ACPT;
1059         break;
1060     case WLAN_SP_MESH_PEERING_CONFIRM:
1061         if (!matches_local)
1062             event = CNF_RJCT;
1063         if (!mesh_plink_free_count(sdata) ||
1064             sta->mesh->llid != llid ||
1065             (sta->mesh->plid && sta->mesh->plid != plid))
1066             event = CNF_IGNR;
1067         else
1068             event = CNF_ACPT;
1069         break;
1070     case WLAN_SP_MESH_PEERING_CLOSE:
1071         if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1072             /* Do not check for llid or plid. This does not
1073              * follow the standard but since multiple plinks
1074              * per sta are not supported, it is necessary in
1075              * order to avoid a livelock when MP A sees an
1076              * establish peer link to MP B but MP B does not
1077              * see it. This can be caused by a timeout in
1078              * B's peer link establishment or B beign
1079              * restarted.
1080              */
1081             event = CLS_ACPT;
1082         else if (sta->mesh->plid != plid)
1083             event = CLS_IGNR;
1084         else if (ie_len == 8 && sta->mesh->llid != llid)
1085             event = CLS_IGNR;
1086         else
1087             event = CLS_ACPT;
1088         break;
1089     default:
1090         mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1091         break;
1092     }
1093 
1094 out:
1095     return event;
1096 }
1097 
1098 static void
1099 mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1100              struct ieee80211_mgmt *mgmt,
1101              struct ieee802_11_elems *elems,
1102              struct ieee80211_rx_status *rx_status)
1103 {
1104 
1105     struct sta_info *sta;
1106     enum plink_event event;
1107     enum ieee80211_self_protected_actioncode ftype;
1108     u32 changed = 0;
1109     u8 ie_len = elems->peering_len;
1110     u16 plid, llid = 0;
1111 
1112     if (!elems->peering) {
1113         mpl_dbg(sdata,
1114             "Mesh plink: missing necessary peer link ie\n");
1115         return;
1116     }
1117 
1118     if (elems->rsn_len &&
1119         sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1120         mpl_dbg(sdata,
1121             "Mesh plink: can't establish link with secure peer\n");
1122         return;
1123     }
1124 
1125     ftype = mgmt->u.action.u.self_prot.action_code;
1126     if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1127         (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1128         (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1129                             && ie_len != 8)) {
1130         mpl_dbg(sdata,
1131             "Mesh plink: incorrect plink ie length %d %d\n",
1132             ftype, ie_len);
1133         return;
1134     }
1135 
1136     if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1137         (!elems->mesh_id || !elems->mesh_config)) {
1138         mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1139         return;
1140     }
1141     /* Note the lines below are correct, the llid in the frame is the plid
1142      * from the point of view of this host.
1143      */
1144     plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1145     if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1146         (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1147         llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1148 
1149     /* WARNING: Only for sta pointer, is dropped & re-acquired */
1150     rcu_read_lock();
1151 
1152     sta = sta_info_get(sdata, mgmt->sa);
1153 
1154     if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1155         !rssi_threshold_check(sdata, sta)) {
1156         mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1157             mgmt->sa);
1158         goto unlock_rcu;
1159     }
1160 
1161     /* Now we will figure out the appropriate event... */
1162     event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1163 
1164     if (event == OPN_ACPT) {
1165         rcu_read_unlock();
1166         /* allocate sta entry if necessary and update info */
1167         sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
1168         if (!sta) {
1169             mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1170             goto unlock_rcu;
1171         }
1172         sta->mesh->plid = plid;
1173     } else if (!sta && event == OPN_RJCT) {
1174         mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1175                     mgmt->sa, 0, plid,
1176                     WLAN_REASON_MESH_CONFIG);
1177         goto unlock_rcu;
1178     } else if (!sta || event == PLINK_UNDEFINED) {
1179         /* something went wrong */
1180         goto unlock_rcu;
1181     }
1182 
1183     if (event == CNF_ACPT) {
1184         /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1185         if (!sta->mesh->plid)
1186             sta->mesh->plid = plid;
1187 
1188         sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1189     }
1190 
1191     changed |= mesh_plink_fsm(sdata, sta, event);
1192 
1193 unlock_rcu:
1194     rcu_read_unlock();
1195 
1196     if (changed)
1197         ieee80211_mbss_info_change_notify(sdata, changed);
1198 }
1199 
1200 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1201              struct ieee80211_mgmt *mgmt, size_t len,
1202              struct ieee80211_rx_status *rx_status)
1203 {
1204     struct ieee802_11_elems *elems;
1205     size_t baselen;
1206     u8 *baseaddr;
1207 
1208     /* need action_code, aux */
1209     if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1210         return;
1211 
1212     if (sdata->u.mesh.user_mpm)
1213         /* userspace must register for these */
1214         return;
1215 
1216     if (is_multicast_ether_addr(mgmt->da)) {
1217         mpl_dbg(sdata,
1218             "Mesh plink: ignore frame from multicast address\n");
1219         return;
1220     }
1221 
1222     baseaddr = mgmt->u.action.u.self_prot.variable;
1223     baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1224     if (mgmt->u.action.u.self_prot.action_code ==
1225                         WLAN_SP_MESH_PEERING_CONFIRM) {
1226         baseaddr += 4;
1227         baselen += 4;
1228 
1229         if (baselen > len)
1230             return;
1231     }
1232     elems = ieee802_11_parse_elems(baseaddr, len - baselen, true, NULL);
1233     mesh_process_plink_frame(sdata, mgmt, elems, rx_status);
1234     kfree(elems);
1235 }
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