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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * mac80211 TDLS handling code
0004  *
0005  * Copyright 2006-2010  Johannes Berg <johannes@sipsolutions.net>
0006  * Copyright 2014, Intel Corporation
0007  * Copyright 2014  Intel Mobile Communications GmbH
0008  * Copyright 2015 - 2016 Intel Deutschland GmbH
0009  * Copyright (C) 2019, 2021-2022 Intel Corporation
0010  */
0011 
0012 #include <linux/ieee80211.h>
0013 #include <linux/log2.h>
0014 #include <net/cfg80211.h>
0015 #include <linux/rtnetlink.h>
0016 #include "ieee80211_i.h"
0017 #include "driver-ops.h"
0018 #include "rate.h"
0019 #include "wme.h"
0020 
0021 /* give usermode some time for retries in setting up the TDLS session */
0022 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
0023 
0024 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
0025 {
0026     struct ieee80211_sub_if_data *sdata;
0027     struct ieee80211_local *local;
0028 
0029     sdata = container_of(wk, struct ieee80211_sub_if_data,
0030                  u.mgd.tdls_peer_del_work.work);
0031     local = sdata->local;
0032 
0033     mutex_lock(&local->mtx);
0034     if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
0035         tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
0036         sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
0037         eth_zero_addr(sdata->u.mgd.tdls_peer);
0038     }
0039     mutex_unlock(&local->mtx);
0040 }
0041 
0042 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
0043                      struct sk_buff *skb)
0044 {
0045     struct ieee80211_local *local = sdata->local;
0046     struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
0047     bool chan_switch = local->hw.wiphy->features &
0048                NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
0049     bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
0050               !ifmgd->tdls_wider_bw_prohibited;
0051     bool buffer_sta = ieee80211_hw_check(&local->hw,
0052                          SUPPORTS_TDLS_BUFFER_STA);
0053     struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
0054     bool vht = sband && sband->vht_cap.vht_supported;
0055     u8 *pos = skb_put(skb, 10);
0056 
0057     *pos++ = WLAN_EID_EXT_CAPABILITY;
0058     *pos++ = 8; /* len */
0059     *pos++ = 0x0;
0060     *pos++ = 0x0;
0061     *pos++ = 0x0;
0062     *pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) |
0063          (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0);
0064     *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
0065     *pos++ = 0;
0066     *pos++ = 0;
0067     *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
0068 }
0069 
0070 static u8
0071 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
0072                struct sk_buff *skb, u16 start, u16 end,
0073                u16 spacing)
0074 {
0075     u8 subband_cnt = 0, ch_cnt = 0;
0076     struct ieee80211_channel *ch;
0077     struct cfg80211_chan_def chandef;
0078     int i, subband_start;
0079     struct wiphy *wiphy = sdata->local->hw.wiphy;
0080 
0081     for (i = start; i <= end; i += spacing) {
0082         if (!ch_cnt)
0083             subband_start = i;
0084 
0085         ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
0086         if (ch) {
0087             /* we will be active on the channel */
0088             cfg80211_chandef_create(&chandef, ch,
0089                         NL80211_CHAN_NO_HT);
0090             if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
0091                               sdata->wdev.iftype)) {
0092                 ch_cnt++;
0093                 /*
0094                  * check if the next channel is also part of
0095                  * this allowed range
0096                  */
0097                 continue;
0098             }
0099         }
0100 
0101         /*
0102          * we've reached the end of a range, with allowed channels
0103          * found
0104          */
0105         if (ch_cnt) {
0106             u8 *pos = skb_put(skb, 2);
0107             *pos++ = ieee80211_frequency_to_channel(subband_start);
0108             *pos++ = ch_cnt;
0109 
0110             subband_cnt++;
0111             ch_cnt = 0;
0112         }
0113     }
0114 
0115     /* all channels in the requested range are allowed - add them here */
0116     if (ch_cnt) {
0117         u8 *pos = skb_put(skb, 2);
0118         *pos++ = ieee80211_frequency_to_channel(subband_start);
0119         *pos++ = ch_cnt;
0120 
0121         subband_cnt++;
0122     }
0123 
0124     return subband_cnt;
0125 }
0126 
0127 static void
0128 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
0129                  struct sk_buff *skb)
0130 {
0131     /*
0132      * Add possible channels for TDLS. These are channels that are allowed
0133      * to be active.
0134      */
0135     u8 subband_cnt;
0136     u8 *pos = skb_put(skb, 2);
0137 
0138     *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
0139 
0140     /*
0141      * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
0142      * this doesn't happen in real world scenarios.
0143      */
0144 
0145     /* 2GHz, with 5MHz spacing */
0146     subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
0147 
0148     /* 5GHz, with 20MHz spacing */
0149     subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
0150 
0151     /* length */
0152     *pos = 2 * subband_cnt;
0153 }
0154 
0155 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
0156                         struct sk_buff *skb)
0157 {
0158     u8 *pos;
0159     u8 op_class;
0160 
0161     if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
0162                           &op_class))
0163         return;
0164 
0165     pos = skb_put(skb, 4);
0166     *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
0167     *pos++ = 2; /* len */
0168 
0169     *pos++ = op_class;
0170     *pos++ = op_class; /* give current operating class as alternate too */
0171 }
0172 
0173 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
0174 {
0175     u8 *pos = skb_put(skb, 3);
0176 
0177     *pos++ = WLAN_EID_BSS_COEX_2040;
0178     *pos++ = 1; /* len */
0179 
0180     *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
0181 }
0182 
0183 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
0184                     u16 status_code)
0185 {
0186     struct ieee80211_supported_band *sband;
0187 
0188     /* The capability will be 0 when sending a failure code */
0189     if (status_code != 0)
0190         return 0;
0191 
0192     sband = ieee80211_get_sband(sdata);
0193     if (sband && sband->band == NL80211_BAND_2GHZ) {
0194         return WLAN_CAPABILITY_SHORT_SLOT_TIME |
0195                WLAN_CAPABILITY_SHORT_PREAMBLE;
0196     }
0197 
0198     return 0;
0199 }
0200 
0201 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
0202                        struct sk_buff *skb, const u8 *peer,
0203                        bool initiator)
0204 {
0205     struct ieee80211_tdls_lnkie *lnkid;
0206     const u8 *init_addr, *rsp_addr;
0207 
0208     if (initiator) {
0209         init_addr = sdata->vif.addr;
0210         rsp_addr = peer;
0211     } else {
0212         init_addr = peer;
0213         rsp_addr = sdata->vif.addr;
0214     }
0215 
0216     lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
0217 
0218     lnkid->ie_type = WLAN_EID_LINK_ID;
0219     lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
0220 
0221     memcpy(lnkid->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
0222     memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
0223     memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
0224 }
0225 
0226 static void
0227 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
0228 {
0229     u8 *pos = skb_put(skb, 4);
0230 
0231     *pos++ = WLAN_EID_AID;
0232     *pos++ = 2; /* len */
0233     put_unaligned_le16(sdata->vif.cfg.aid, pos);
0234 }
0235 
0236 /* translate numbering in the WMM parameter IE to the mac80211 notation */
0237 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
0238 {
0239     switch (ac) {
0240     default:
0241         WARN_ON_ONCE(1);
0242         fallthrough;
0243     case 0:
0244         return IEEE80211_AC_BE;
0245     case 1:
0246         return IEEE80211_AC_BK;
0247     case 2:
0248         return IEEE80211_AC_VI;
0249     case 3:
0250         return IEEE80211_AC_VO;
0251     }
0252 }
0253 
0254 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
0255 {
0256     u8 ret;
0257 
0258     ret = aifsn & 0x0f;
0259     if (acm)
0260         ret |= 0x10;
0261     ret |= (aci << 5) & 0x60;
0262     return ret;
0263 }
0264 
0265 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
0266 {
0267     return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
0268            ((ilog2(cw_max + 1) << 0x4) & 0xf0);
0269 }
0270 
0271 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
0272                         struct sk_buff *skb)
0273 {
0274     struct ieee80211_wmm_param_ie *wmm;
0275     struct ieee80211_tx_queue_params *txq;
0276     int i;
0277 
0278     wmm = skb_put_zero(skb, sizeof(*wmm));
0279 
0280     wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
0281     wmm->len = sizeof(*wmm) - 2;
0282 
0283     wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
0284     wmm->oui[1] = 0x50;
0285     wmm->oui[2] = 0xf2;
0286     wmm->oui_type = 2; /* WME */
0287     wmm->oui_subtype = 1; /* WME param */
0288     wmm->version = 1; /* WME ver */
0289     wmm->qos_info = 0; /* U-APSD not in use */
0290 
0291     /*
0292      * Use the EDCA parameters defined for the BSS, or default if the AP
0293      * doesn't support it, as mandated by 802.11-2012 section 10.22.4
0294      */
0295     for (i = 0; i < IEEE80211_NUM_ACS; i++) {
0296         txq = &sdata->deflink.tx_conf[ieee80211_ac_from_wmm(i)];
0297         wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
0298                                    txq->acm, i);
0299         wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
0300         wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
0301     }
0302 }
0303 
0304 static void
0305 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
0306                    struct sta_info *sta)
0307 {
0308     /* IEEE802.11ac-2013 Table E-4 */
0309     u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
0310     struct cfg80211_chan_def uc = sta->tdls_chandef;
0311     enum nl80211_chan_width max_width =
0312         ieee80211_sta_cap_chan_bw(&sta->deflink);
0313     int i;
0314 
0315     /* only support upgrading non-narrow channels up to 80Mhz */
0316     if (max_width == NL80211_CHAN_WIDTH_5 ||
0317         max_width == NL80211_CHAN_WIDTH_10)
0318         return;
0319 
0320     if (max_width > NL80211_CHAN_WIDTH_80)
0321         max_width = NL80211_CHAN_WIDTH_80;
0322 
0323     if (uc.width >= max_width)
0324         return;
0325     /*
0326      * Channel usage constrains in the IEEE802.11ac-2013 specification only
0327      * allow expanding a 20MHz channel to 80MHz in a single way. In
0328      * addition, there are no 40MHz allowed channels that are not part of
0329      * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
0330      */
0331     for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
0332         if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
0333             uc.center_freq1 = centers_80mhz[i];
0334             uc.center_freq2 = 0;
0335             uc.width = NL80211_CHAN_WIDTH_80;
0336             break;
0337         }
0338 
0339     if (!uc.center_freq1)
0340         return;
0341 
0342     /* proceed to downgrade the chandef until usable or the same as AP BW */
0343     while (uc.width > max_width ||
0344            (uc.width > sta->tdls_chandef.width &&
0345         !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
0346                            sdata->wdev.iftype)))
0347         ieee80211_chandef_downgrade(&uc);
0348 
0349     if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
0350         tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
0351              sta->tdls_chandef.width, uc.width);
0352 
0353         /*
0354          * the station is not yet authorized when BW upgrade is done,
0355          * locking is not required
0356          */
0357         sta->tdls_chandef = uc;
0358     }
0359 }
0360 
0361 static void
0362 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
0363                    struct sk_buff *skb, const u8 *peer,
0364                    u8 action_code, bool initiator,
0365                    const u8 *extra_ies, size_t extra_ies_len)
0366 {
0367     struct ieee80211_supported_band *sband;
0368     struct ieee80211_local *local = sdata->local;
0369     struct ieee80211_sta_ht_cap ht_cap;
0370     struct ieee80211_sta_vht_cap vht_cap;
0371     struct sta_info *sta = NULL;
0372     size_t offset = 0, noffset;
0373     u8 *pos;
0374 
0375     sband = ieee80211_get_sband(sdata);
0376     if (!sband)
0377         return;
0378 
0379     ieee80211_add_srates_ie(sdata, skb, false, sband->band);
0380     ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
0381     ieee80211_tdls_add_supp_channels(sdata, skb);
0382 
0383     /* add any custom IEs that go before Extended Capabilities */
0384     if (extra_ies_len) {
0385         static const u8 before_ext_cap[] = {
0386             WLAN_EID_SUPP_RATES,
0387             WLAN_EID_COUNTRY,
0388             WLAN_EID_EXT_SUPP_RATES,
0389             WLAN_EID_SUPPORTED_CHANNELS,
0390             WLAN_EID_RSN,
0391         };
0392         noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
0393                          before_ext_cap,
0394                          ARRAY_SIZE(before_ext_cap),
0395                          offset);
0396         skb_put_data(skb, extra_ies + offset, noffset - offset);
0397         offset = noffset;
0398     }
0399 
0400     ieee80211_tdls_add_ext_capab(sdata, skb);
0401 
0402     /* add the QoS element if we support it */
0403     if (local->hw.queues >= IEEE80211_NUM_ACS &&
0404         action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
0405         ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
0406 
0407     /* add any custom IEs that go before HT capabilities */
0408     if (extra_ies_len) {
0409         static const u8 before_ht_cap[] = {
0410             WLAN_EID_SUPP_RATES,
0411             WLAN_EID_COUNTRY,
0412             WLAN_EID_EXT_SUPP_RATES,
0413             WLAN_EID_SUPPORTED_CHANNELS,
0414             WLAN_EID_RSN,
0415             WLAN_EID_EXT_CAPABILITY,
0416             WLAN_EID_QOS_CAPA,
0417             WLAN_EID_FAST_BSS_TRANSITION,
0418             WLAN_EID_TIMEOUT_INTERVAL,
0419             WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
0420         };
0421         noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
0422                          before_ht_cap,
0423                          ARRAY_SIZE(before_ht_cap),
0424                          offset);
0425         skb_put_data(skb, extra_ies + offset, noffset - offset);
0426         offset = noffset;
0427     }
0428 
0429     mutex_lock(&local->sta_mtx);
0430 
0431     /* we should have the peer STA if we're already responding */
0432     if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
0433         sta = sta_info_get(sdata, peer);
0434         if (WARN_ON_ONCE(!sta)) {
0435             mutex_unlock(&local->sta_mtx);
0436             return;
0437         }
0438 
0439         sta->tdls_chandef = sdata->vif.bss_conf.chandef;
0440     }
0441 
0442     ieee80211_tdls_add_oper_classes(sdata, skb);
0443 
0444     /*
0445      * with TDLS we can switch channels, and HT-caps are not necessarily
0446      * the same on all bands. The specification limits the setup to a
0447      * single HT-cap, so use the current band for now.
0448      */
0449     memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
0450 
0451     if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
0452          action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
0453         ht_cap.ht_supported) {
0454         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
0455 
0456         /* disable SMPS in TDLS initiator */
0457         ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
0458                 << IEEE80211_HT_CAP_SM_PS_SHIFT;
0459 
0460         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
0461         ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
0462     } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
0463            ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) {
0464         /* the peer caps are already intersected with our own */
0465         memcpy(&ht_cap, &sta->sta.deflink.ht_cap, sizeof(ht_cap));
0466 
0467         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
0468         ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
0469     }
0470 
0471     if (ht_cap.ht_supported &&
0472         (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
0473         ieee80211_tdls_add_bss_coex_ie(skb);
0474 
0475     ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
0476 
0477     /* add any custom IEs that go before VHT capabilities */
0478     if (extra_ies_len) {
0479         static const u8 before_vht_cap[] = {
0480             WLAN_EID_SUPP_RATES,
0481             WLAN_EID_COUNTRY,
0482             WLAN_EID_EXT_SUPP_RATES,
0483             WLAN_EID_SUPPORTED_CHANNELS,
0484             WLAN_EID_RSN,
0485             WLAN_EID_EXT_CAPABILITY,
0486             WLAN_EID_QOS_CAPA,
0487             WLAN_EID_FAST_BSS_TRANSITION,
0488             WLAN_EID_TIMEOUT_INTERVAL,
0489             WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
0490             WLAN_EID_MULTI_BAND,
0491         };
0492         noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
0493                          before_vht_cap,
0494                          ARRAY_SIZE(before_vht_cap),
0495                          offset);
0496         skb_put_data(skb, extra_ies + offset, noffset - offset);
0497         offset = noffset;
0498     }
0499 
0500     /* build the VHT-cap similarly to the HT-cap */
0501     memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
0502     if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
0503          action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
0504         vht_cap.vht_supported) {
0505         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
0506 
0507         /* the AID is present only when VHT is implemented */
0508         if (action_code == WLAN_TDLS_SETUP_REQUEST)
0509             ieee80211_tdls_add_aid(sdata, skb);
0510 
0511         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
0512         ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
0513     } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
0514            vht_cap.vht_supported && sta->sta.deflink.vht_cap.vht_supported) {
0515         /* the peer caps are already intersected with our own */
0516         memcpy(&vht_cap, &sta->sta.deflink.vht_cap, sizeof(vht_cap));
0517 
0518         /* the AID is present only when VHT is implemented */
0519         ieee80211_tdls_add_aid(sdata, skb);
0520 
0521         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
0522         ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
0523 
0524         /*
0525          * if both peers support WIDER_BW, we can expand the chandef to
0526          * a wider compatible one, up to 80MHz
0527          */
0528         if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
0529             ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
0530     }
0531 
0532     mutex_unlock(&local->sta_mtx);
0533 
0534     /* add any remaining IEs */
0535     if (extra_ies_len) {
0536         noffset = extra_ies_len;
0537         skb_put_data(skb, extra_ies + offset, noffset - offset);
0538     }
0539 
0540 }
0541 
0542 static void
0543 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
0544                  struct sk_buff *skb, const u8 *peer,
0545                  bool initiator, const u8 *extra_ies,
0546                  size_t extra_ies_len)
0547 {
0548     struct ieee80211_local *local = sdata->local;
0549     size_t offset = 0, noffset;
0550     struct sta_info *sta, *ap_sta;
0551     struct ieee80211_supported_band *sband;
0552     u8 *pos;
0553 
0554     sband = ieee80211_get_sband(sdata);
0555     if (!sband)
0556         return;
0557 
0558     mutex_lock(&local->sta_mtx);
0559 
0560     sta = sta_info_get(sdata, peer);
0561     ap_sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
0562     if (WARN_ON_ONCE(!sta || !ap_sta)) {
0563         mutex_unlock(&local->sta_mtx);
0564         return;
0565     }
0566 
0567     sta->tdls_chandef = sdata->vif.bss_conf.chandef;
0568 
0569     /* add any custom IEs that go before the QoS IE */
0570     if (extra_ies_len) {
0571         static const u8 before_qos[] = {
0572             WLAN_EID_RSN,
0573         };
0574         noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
0575                          before_qos,
0576                          ARRAY_SIZE(before_qos),
0577                          offset);
0578         skb_put_data(skb, extra_ies + offset, noffset - offset);
0579         offset = noffset;
0580     }
0581 
0582     /* add the QoS param IE if both the peer and we support it */
0583     if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
0584         ieee80211_tdls_add_wmm_param_ie(sdata, skb);
0585 
0586     /* add any custom IEs that go before HT operation */
0587     if (extra_ies_len) {
0588         static const u8 before_ht_op[] = {
0589             WLAN_EID_RSN,
0590             WLAN_EID_QOS_CAPA,
0591             WLAN_EID_FAST_BSS_TRANSITION,
0592             WLAN_EID_TIMEOUT_INTERVAL,
0593         };
0594         noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
0595                          before_ht_op,
0596                          ARRAY_SIZE(before_ht_op),
0597                          offset);
0598         skb_put_data(skb, extra_ies + offset, noffset - offset);
0599         offset = noffset;
0600     }
0601 
0602     /*
0603      * if HT support is only added in TDLS, we need an HT-operation IE.
0604      * add the IE as required by IEEE802.11-2012 9.23.3.2.
0605      */
0606     if (!ap_sta->sta.deflink.ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) {
0607         u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
0608                IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
0609                IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
0610 
0611         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
0612         ieee80211_ie_build_ht_oper(pos, &sta->sta.deflink.ht_cap,
0613                        &sdata->vif.bss_conf.chandef, prot,
0614                        true);
0615     }
0616 
0617     ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
0618 
0619     /* only include VHT-operation if not on the 2.4GHz band */
0620     if (sband->band != NL80211_BAND_2GHZ &&
0621         sta->sta.deflink.vht_cap.vht_supported) {
0622         /*
0623          * if both peers support WIDER_BW, we can expand the chandef to
0624          * a wider compatible one, up to 80MHz
0625          */
0626         if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
0627             ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
0628 
0629         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
0630         ieee80211_ie_build_vht_oper(pos, &sta->sta.deflink.vht_cap,
0631                         &sta->tdls_chandef);
0632     }
0633 
0634     mutex_unlock(&local->sta_mtx);
0635 
0636     /* add any remaining IEs */
0637     if (extra_ies_len) {
0638         noffset = extra_ies_len;
0639         skb_put_data(skb, extra_ies + offset, noffset - offset);
0640     }
0641 }
0642 
0643 static void
0644 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
0645                        struct sk_buff *skb, const u8 *peer,
0646                        bool initiator, const u8 *extra_ies,
0647                        size_t extra_ies_len, u8 oper_class,
0648                        struct cfg80211_chan_def *chandef)
0649 {
0650     struct ieee80211_tdls_data *tf;
0651     size_t offset = 0, noffset;
0652 
0653     if (WARN_ON_ONCE(!chandef))
0654         return;
0655 
0656     tf = (void *)skb->data;
0657     tf->u.chan_switch_req.target_channel =
0658         ieee80211_frequency_to_channel(chandef->chan->center_freq);
0659     tf->u.chan_switch_req.oper_class = oper_class;
0660 
0661     if (extra_ies_len) {
0662         static const u8 before_lnkie[] = {
0663             WLAN_EID_SECONDARY_CHANNEL_OFFSET,
0664         };
0665         noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
0666                          before_lnkie,
0667                          ARRAY_SIZE(before_lnkie),
0668                          offset);
0669         skb_put_data(skb, extra_ies + offset, noffset - offset);
0670         offset = noffset;
0671     }
0672 
0673     ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
0674 
0675     /* add any remaining IEs */
0676     if (extra_ies_len) {
0677         noffset = extra_ies_len;
0678         skb_put_data(skb, extra_ies + offset, noffset - offset);
0679     }
0680 }
0681 
0682 static void
0683 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
0684                     struct sk_buff *skb, const u8 *peer,
0685                     u16 status_code, bool initiator,
0686                     const u8 *extra_ies,
0687                     size_t extra_ies_len)
0688 {
0689     if (status_code == 0)
0690         ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
0691 
0692     if (extra_ies_len)
0693         skb_put_data(skb, extra_ies, extra_ies_len);
0694 }
0695 
0696 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
0697                    struct sk_buff *skb, const u8 *peer,
0698                    u8 action_code, u16 status_code,
0699                    bool initiator, const u8 *extra_ies,
0700                    size_t extra_ies_len, u8 oper_class,
0701                    struct cfg80211_chan_def *chandef)
0702 {
0703     switch (action_code) {
0704     case WLAN_TDLS_SETUP_REQUEST:
0705     case WLAN_TDLS_SETUP_RESPONSE:
0706     case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
0707         if (status_code == 0)
0708             ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
0709                                action_code,
0710                                initiator,
0711                                extra_ies,
0712                                extra_ies_len);
0713         break;
0714     case WLAN_TDLS_SETUP_CONFIRM:
0715         if (status_code == 0)
0716             ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
0717                              initiator, extra_ies,
0718                              extra_ies_len);
0719         break;
0720     case WLAN_TDLS_TEARDOWN:
0721     case WLAN_TDLS_DISCOVERY_REQUEST:
0722         if (extra_ies_len)
0723             skb_put_data(skb, extra_ies, extra_ies_len);
0724         if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
0725             ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
0726         break;
0727     case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
0728         ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
0729                                initiator, extra_ies,
0730                                extra_ies_len,
0731                                oper_class, chandef);
0732         break;
0733     case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
0734         ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
0735                             status_code,
0736                             initiator, extra_ies,
0737                             extra_ies_len);
0738         break;
0739     }
0740 
0741 }
0742 
0743 static int
0744 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
0745                    const u8 *peer, u8 action_code, u8 dialog_token,
0746                    u16 status_code, struct sk_buff *skb)
0747 {
0748     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
0749     struct ieee80211_tdls_data *tf;
0750 
0751     tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
0752 
0753     memcpy(tf->da, peer, ETH_ALEN);
0754     memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
0755     tf->ether_type = cpu_to_be16(ETH_P_TDLS);
0756     tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
0757 
0758     /* network header is after the ethernet header */
0759     skb_set_network_header(skb, ETH_HLEN);
0760 
0761     switch (action_code) {
0762     case WLAN_TDLS_SETUP_REQUEST:
0763         tf->category = WLAN_CATEGORY_TDLS;
0764         tf->action_code = WLAN_TDLS_SETUP_REQUEST;
0765 
0766         skb_put(skb, sizeof(tf->u.setup_req));
0767         tf->u.setup_req.dialog_token = dialog_token;
0768         tf->u.setup_req.capability =
0769             cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
0770                                  status_code));
0771         break;
0772     case WLAN_TDLS_SETUP_RESPONSE:
0773         tf->category = WLAN_CATEGORY_TDLS;
0774         tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
0775 
0776         skb_put(skb, sizeof(tf->u.setup_resp));
0777         tf->u.setup_resp.status_code = cpu_to_le16(status_code);
0778         tf->u.setup_resp.dialog_token = dialog_token;
0779         tf->u.setup_resp.capability =
0780             cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
0781                                  status_code));
0782         break;
0783     case WLAN_TDLS_SETUP_CONFIRM:
0784         tf->category = WLAN_CATEGORY_TDLS;
0785         tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
0786 
0787         skb_put(skb, sizeof(tf->u.setup_cfm));
0788         tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
0789         tf->u.setup_cfm.dialog_token = dialog_token;
0790         break;
0791     case WLAN_TDLS_TEARDOWN:
0792         tf->category = WLAN_CATEGORY_TDLS;
0793         tf->action_code = WLAN_TDLS_TEARDOWN;
0794 
0795         skb_put(skb, sizeof(tf->u.teardown));
0796         tf->u.teardown.reason_code = cpu_to_le16(status_code);
0797         break;
0798     case WLAN_TDLS_DISCOVERY_REQUEST:
0799         tf->category = WLAN_CATEGORY_TDLS;
0800         tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
0801 
0802         skb_put(skb, sizeof(tf->u.discover_req));
0803         tf->u.discover_req.dialog_token = dialog_token;
0804         break;
0805     case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
0806         tf->category = WLAN_CATEGORY_TDLS;
0807         tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
0808 
0809         skb_put(skb, sizeof(tf->u.chan_switch_req));
0810         break;
0811     case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
0812         tf->category = WLAN_CATEGORY_TDLS;
0813         tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
0814 
0815         skb_put(skb, sizeof(tf->u.chan_switch_resp));
0816         tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
0817         break;
0818     default:
0819         return -EINVAL;
0820     }
0821 
0822     return 0;
0823 }
0824 
0825 static int
0826 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
0827                const u8 *peer, u8 action_code, u8 dialog_token,
0828                u16 status_code, struct sk_buff *skb)
0829 {
0830     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
0831     struct ieee80211_mgmt *mgmt;
0832 
0833     mgmt = skb_put_zero(skb, 24);
0834     memcpy(mgmt->da, peer, ETH_ALEN);
0835     memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
0836     memcpy(mgmt->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
0837 
0838     mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
0839                       IEEE80211_STYPE_ACTION);
0840 
0841     switch (action_code) {
0842     case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
0843         skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
0844         mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
0845         mgmt->u.action.u.tdls_discover_resp.action_code =
0846             WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
0847         mgmt->u.action.u.tdls_discover_resp.dialog_token =
0848             dialog_token;
0849         mgmt->u.action.u.tdls_discover_resp.capability =
0850             cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
0851                                  status_code));
0852         break;
0853     default:
0854         return -EINVAL;
0855     }
0856 
0857     return 0;
0858 }
0859 
0860 static struct sk_buff *
0861 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
0862                       const u8 *peer, u8 action_code,
0863                       u8 dialog_token, u16 status_code,
0864                       bool initiator, const u8 *extra_ies,
0865                       size_t extra_ies_len, u8 oper_class,
0866                       struct cfg80211_chan_def *chandef)
0867 {
0868     struct ieee80211_local *local = sdata->local;
0869     struct sk_buff *skb;
0870     int ret;
0871 
0872     skb = netdev_alloc_skb(sdata->dev,
0873                    local->hw.extra_tx_headroom +
0874                    max(sizeof(struct ieee80211_mgmt),
0875                    sizeof(struct ieee80211_tdls_data)) +
0876                    50 + /* supported rates */
0877                    10 + /* ext capab */
0878                    26 + /* max(WMM-info, WMM-param) */
0879                    2 + max(sizeof(struct ieee80211_ht_cap),
0880                        sizeof(struct ieee80211_ht_operation)) +
0881                    2 + max(sizeof(struct ieee80211_vht_cap),
0882                        sizeof(struct ieee80211_vht_operation)) +
0883                    50 + /* supported channels */
0884                    3 + /* 40/20 BSS coex */
0885                    4 + /* AID */
0886                    4 + /* oper classes */
0887                    extra_ies_len +
0888                    sizeof(struct ieee80211_tdls_lnkie));
0889     if (!skb)
0890         return NULL;
0891 
0892     skb_reserve(skb, local->hw.extra_tx_headroom);
0893 
0894     switch (action_code) {
0895     case WLAN_TDLS_SETUP_REQUEST:
0896     case WLAN_TDLS_SETUP_RESPONSE:
0897     case WLAN_TDLS_SETUP_CONFIRM:
0898     case WLAN_TDLS_TEARDOWN:
0899     case WLAN_TDLS_DISCOVERY_REQUEST:
0900     case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
0901     case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
0902         ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
0903                              sdata->dev, peer,
0904                              action_code, dialog_token,
0905                              status_code, skb);
0906         break;
0907     case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
0908         ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
0909                          peer, action_code,
0910                          dialog_token, status_code,
0911                          skb);
0912         break;
0913     default:
0914         ret = -ENOTSUPP;
0915         break;
0916     }
0917 
0918     if (ret < 0)
0919         goto fail;
0920 
0921     ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
0922                    initiator, extra_ies, extra_ies_len, oper_class,
0923                    chandef);
0924     return skb;
0925 
0926 fail:
0927     dev_kfree_skb(skb);
0928     return NULL;
0929 }
0930 
0931 static int
0932 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
0933                 const u8 *peer, u8 action_code, u8 dialog_token,
0934                 u16 status_code, u32 peer_capability,
0935                 bool initiator, const u8 *extra_ies,
0936                 size_t extra_ies_len, u8 oper_class,
0937                 struct cfg80211_chan_def *chandef)
0938 {
0939     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
0940     struct sk_buff *skb = NULL;
0941     struct sta_info *sta;
0942     u32 flags = 0;
0943     int ret = 0;
0944 
0945     rcu_read_lock();
0946     sta = sta_info_get(sdata, peer);
0947 
0948     /* infer the initiator if we can, to support old userspace */
0949     switch (action_code) {
0950     case WLAN_TDLS_SETUP_REQUEST:
0951         if (sta) {
0952             set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
0953             sta->sta.tdls_initiator = false;
0954         }
0955         fallthrough;
0956     case WLAN_TDLS_SETUP_CONFIRM:
0957     case WLAN_TDLS_DISCOVERY_REQUEST:
0958         initiator = true;
0959         break;
0960     case WLAN_TDLS_SETUP_RESPONSE:
0961         /*
0962          * In some testing scenarios, we send a request and response.
0963          * Make the last packet sent take effect for the initiator
0964          * value.
0965          */
0966         if (sta) {
0967             clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
0968             sta->sta.tdls_initiator = true;
0969         }
0970         fallthrough;
0971     case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
0972         initiator = false;
0973         break;
0974     case WLAN_TDLS_TEARDOWN:
0975     case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
0976     case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
0977         /* any value is ok */
0978         break;
0979     default:
0980         ret = -ENOTSUPP;
0981         break;
0982     }
0983 
0984     if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
0985         initiator = true;
0986 
0987     rcu_read_unlock();
0988     if (ret < 0)
0989         goto fail;
0990 
0991     skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
0992                             dialog_token, status_code,
0993                             initiator, extra_ies,
0994                             extra_ies_len, oper_class,
0995                             chandef);
0996     if (!skb) {
0997         ret = -EINVAL;
0998         goto fail;
0999     }
1000 
1001     if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1002         ieee80211_tx_skb(sdata, skb);
1003         return 0;
1004     }
1005 
1006     /*
1007      * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1008      * we should default to AC_VI.
1009      */
1010     switch (action_code) {
1011     case WLAN_TDLS_SETUP_REQUEST:
1012     case WLAN_TDLS_SETUP_RESPONSE:
1013         skb->priority = 256 + 2;
1014         break;
1015     default:
1016         skb->priority = 256 + 5;
1017         break;
1018     }
1019     skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb));
1020 
1021     /*
1022      * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1023      * Later, if no ACK is returned from peer, we will re-send the teardown
1024      * packet through the AP.
1025      */
1026     if ((action_code == WLAN_TDLS_TEARDOWN) &&
1027         ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1028         bool try_resend; /* Should we keep skb for possible resend */
1029 
1030         /* If not sending directly to peer - no point in keeping skb */
1031         rcu_read_lock();
1032         sta = sta_info_get(sdata, peer);
1033         try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1034         rcu_read_unlock();
1035 
1036         spin_lock_bh(&sdata->u.mgd.teardown_lock);
1037         if (try_resend && !sdata->u.mgd.teardown_skb) {
1038             /* Mark it as requiring TX status callback  */
1039             flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1040                  IEEE80211_TX_INTFL_MLME_CONN_TX;
1041 
1042             /*
1043              * skb is copied since mac80211 will later set
1044              * properties that might not be the same as the AP,
1045              * such as encryption, QoS, addresses, etc.
1046              *
1047              * No problem if skb_copy() fails, so no need to check.
1048              */
1049             sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1050             sdata->u.mgd.orig_teardown_skb = skb;
1051         }
1052         spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1053     }
1054 
1055     /* disable bottom halves when entering the Tx path */
1056     local_bh_disable();
1057     __ieee80211_subif_start_xmit(skb, dev, flags,
1058                      IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL);
1059     local_bh_enable();
1060 
1061     return ret;
1062 
1063 fail:
1064     dev_kfree_skb(skb);
1065     return ret;
1066 }
1067 
1068 static int
1069 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1070               const u8 *peer, u8 action_code, u8 dialog_token,
1071               u16 status_code, u32 peer_capability, bool initiator,
1072               const u8 *extra_ies, size_t extra_ies_len)
1073 {
1074     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1075     struct ieee80211_local *local = sdata->local;
1076     enum ieee80211_smps_mode smps_mode =
1077         sdata->deflink.u.mgd.driver_smps_mode;
1078     int ret;
1079 
1080     /* don't support setup with forced SMPS mode that's not off */
1081     if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1082         smps_mode != IEEE80211_SMPS_OFF) {
1083         tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1084              smps_mode);
1085         return -ENOTSUPP;
1086     }
1087 
1088     mutex_lock(&local->mtx);
1089 
1090     /* we don't support concurrent TDLS peer setups */
1091     if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1092         !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1093         ret = -EBUSY;
1094         goto out_unlock;
1095     }
1096 
1097     /*
1098      * make sure we have a STA representing the peer so we drop or buffer
1099      * non-TDLS-setup frames to the peer. We can't send other packets
1100      * during setup through the AP path.
1101      * Allow error packets to be sent - sometimes we don't even add a STA
1102      * before failing the setup.
1103      */
1104     if (status_code == 0) {
1105         rcu_read_lock();
1106         if (!sta_info_get(sdata, peer)) {
1107             rcu_read_unlock();
1108             ret = -ENOLINK;
1109             goto out_unlock;
1110         }
1111         rcu_read_unlock();
1112     }
1113 
1114     ieee80211_flush_queues(local, sdata, false);
1115     memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1116     mutex_unlock(&local->mtx);
1117 
1118     /* we cannot take the mutex while preparing the setup packet */
1119     ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1120                           dialog_token, status_code,
1121                           peer_capability, initiator,
1122                           extra_ies, extra_ies_len, 0,
1123                           NULL);
1124     if (ret < 0) {
1125         mutex_lock(&local->mtx);
1126         eth_zero_addr(sdata->u.mgd.tdls_peer);
1127         mutex_unlock(&local->mtx);
1128         return ret;
1129     }
1130 
1131     ieee80211_queue_delayed_work(&sdata->local->hw,
1132                      &sdata->u.mgd.tdls_peer_del_work,
1133                      TDLS_PEER_SETUP_TIMEOUT);
1134     return 0;
1135 
1136 out_unlock:
1137     mutex_unlock(&local->mtx);
1138     return ret;
1139 }
1140 
1141 static int
1142 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1143                  const u8 *peer, u8 action_code, u8 dialog_token,
1144                  u16 status_code, u32 peer_capability,
1145                  bool initiator, const u8 *extra_ies,
1146                  size_t extra_ies_len)
1147 {
1148     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1149     struct ieee80211_local *local = sdata->local;
1150     struct sta_info *sta;
1151     int ret;
1152 
1153     /*
1154      * No packets can be transmitted to the peer via the AP during setup -
1155      * the STA is set as a TDLS peer, but is not authorized.
1156      * During teardown, we prevent direct transmissions by stopping the
1157      * queues and flushing all direct packets.
1158      */
1159     ieee80211_stop_vif_queues(local, sdata,
1160                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1161     ieee80211_flush_queues(local, sdata, false);
1162 
1163     ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1164                           dialog_token, status_code,
1165                           peer_capability, initiator,
1166                           extra_ies, extra_ies_len, 0,
1167                           NULL);
1168     if (ret < 0)
1169         sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1170               ret);
1171 
1172     /*
1173      * Remove the STA AUTH flag to force further traffic through the AP. If
1174      * the STA was unreachable, it was already removed.
1175      */
1176     rcu_read_lock();
1177     sta = sta_info_get(sdata, peer);
1178     if (sta)
1179         clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1180     rcu_read_unlock();
1181 
1182     ieee80211_wake_vif_queues(local, sdata,
1183                   IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1184 
1185     return 0;
1186 }
1187 
1188 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1189             const u8 *peer, u8 action_code, u8 dialog_token,
1190             u16 status_code, u32 peer_capability,
1191             bool initiator, const u8 *extra_ies,
1192             size_t extra_ies_len)
1193 {
1194     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1195     int ret;
1196 
1197     if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1198         return -ENOTSUPP;
1199 
1200     /* make sure we are in managed mode, and associated */
1201     if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1202         !sdata->u.mgd.associated)
1203         return -EINVAL;
1204 
1205     switch (action_code) {
1206     case WLAN_TDLS_SETUP_REQUEST:
1207     case WLAN_TDLS_SETUP_RESPONSE:
1208         ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1209                         dialog_token, status_code,
1210                         peer_capability, initiator,
1211                         extra_ies, extra_ies_len);
1212         break;
1213     case WLAN_TDLS_TEARDOWN:
1214         ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1215                            action_code, dialog_token,
1216                            status_code,
1217                            peer_capability, initiator,
1218                            extra_ies, extra_ies_len);
1219         break;
1220     case WLAN_TDLS_DISCOVERY_REQUEST:
1221         /*
1222          * Protect the discovery so we can hear the TDLS discovery
1223          * response frame. It is transmitted directly and not buffered
1224          * by the AP.
1225          */
1226         drv_mgd_protect_tdls_discover(sdata->local, sdata);
1227         fallthrough;
1228     case WLAN_TDLS_SETUP_CONFIRM:
1229     case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1230         /* no special handling */
1231         ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1232                               action_code,
1233                               dialog_token,
1234                               status_code,
1235                               peer_capability,
1236                               initiator, extra_ies,
1237                               extra_ies_len, 0, NULL);
1238         break;
1239     default:
1240         ret = -EOPNOTSUPP;
1241         break;
1242     }
1243 
1244     tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1245          action_code, peer, ret);
1246     return ret;
1247 }
1248 
1249 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1250                      struct sta_info *sta)
1251 {
1252     struct ieee80211_local *local = sdata->local;
1253     struct ieee80211_chanctx_conf *conf;
1254     struct ieee80211_chanctx *ctx;
1255     enum nl80211_chan_width width;
1256     struct ieee80211_supported_band *sband;
1257 
1258     mutex_lock(&local->chanctx_mtx);
1259     conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
1260                      lockdep_is_held(&local->chanctx_mtx));
1261     if (conf) {
1262         width = conf->def.width;
1263         sband = local->hw.wiphy->bands[conf->def.chan->band];
1264         ctx = container_of(conf, struct ieee80211_chanctx, conf);
1265         ieee80211_recalc_chanctx_chantype(local, ctx);
1266 
1267         /* if width changed and a peer is given, update its BW */
1268         if (width != conf->def.width && sta &&
1269             test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1270             enum ieee80211_sta_rx_bandwidth bw;
1271 
1272             bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1273             bw = min(bw, ieee80211_sta_cap_rx_bw(&sta->deflink));
1274             if (bw != sta->sta.deflink.bandwidth) {
1275                 sta->sta.deflink.bandwidth = bw;
1276                 rate_control_rate_update(local, sband, sta, 0,
1277                              IEEE80211_RC_BW_CHANGED);
1278                 /*
1279                  * if a TDLS peer BW was updated, we need to
1280                  * recalc the chandef width again, to get the
1281                  * correct chanctx min_def
1282                  */
1283                 ieee80211_recalc_chanctx_chantype(local, ctx);
1284             }
1285         }
1286 
1287     }
1288     mutex_unlock(&local->chanctx_mtx);
1289 }
1290 
1291 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1292 {
1293     struct sta_info *sta;
1294     bool result = false;
1295 
1296     rcu_read_lock();
1297     list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1298         if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1299             !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1300             !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1301             !sta->sta.deflink.ht_cap.ht_supported)
1302             continue;
1303         result = true;
1304         break;
1305     }
1306     rcu_read_unlock();
1307 
1308     return result;
1309 }
1310 
1311 static void
1312 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1313                    struct sta_info *sta)
1314 {
1315     bool tdls_ht;
1316     u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1317              IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1318              IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1319     u16 opmode;
1320 
1321     /* Nothing to do if the BSS connection uses HT */
1322     if (!(sdata->deflink.u.mgd.conn_flags & IEEE80211_CONN_DISABLE_HT))
1323         return;
1324 
1325     tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) ||
1326           iee80211_tdls_have_ht_peers(sdata);
1327 
1328     opmode = sdata->vif.bss_conf.ht_operation_mode;
1329 
1330     if (tdls_ht)
1331         opmode |= protection;
1332     else
1333         opmode &= ~protection;
1334 
1335     if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1336         return;
1337 
1338     sdata->vif.bss_conf.ht_operation_mode = opmode;
1339     ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1340                       BSS_CHANGED_HT);
1341 }
1342 
1343 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1344             const u8 *peer, enum nl80211_tdls_operation oper)
1345 {
1346     struct sta_info *sta;
1347     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1348     struct ieee80211_local *local = sdata->local;
1349     int ret;
1350 
1351     if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1352         return -ENOTSUPP;
1353 
1354     if (sdata->vif.type != NL80211_IFTYPE_STATION)
1355         return -EINVAL;
1356 
1357     switch (oper) {
1358     case NL80211_TDLS_ENABLE_LINK:
1359     case NL80211_TDLS_DISABLE_LINK:
1360         break;
1361     case NL80211_TDLS_TEARDOWN:
1362     case NL80211_TDLS_SETUP:
1363     case NL80211_TDLS_DISCOVERY_REQ:
1364         /* We don't support in-driver setup/teardown/discovery */
1365         return -ENOTSUPP;
1366     }
1367 
1368     /* protect possible bss_conf changes and avoid concurrency in
1369      * ieee80211_bss_info_change_notify()
1370      */
1371     sdata_lock(sdata);
1372     mutex_lock(&local->mtx);
1373     tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1374 
1375     switch (oper) {
1376     case NL80211_TDLS_ENABLE_LINK:
1377         if (sdata->vif.bss_conf.csa_active) {
1378             tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1379             ret = -EBUSY;
1380             break;
1381         }
1382 
1383         mutex_lock(&local->sta_mtx);
1384         sta = sta_info_get(sdata, peer);
1385         if (!sta) {
1386             mutex_unlock(&local->sta_mtx);
1387             ret = -ENOLINK;
1388             break;
1389         }
1390 
1391         iee80211_tdls_recalc_chanctx(sdata, sta);
1392         iee80211_tdls_recalc_ht_protection(sdata, sta);
1393 
1394         set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1395         mutex_unlock(&local->sta_mtx);
1396 
1397         WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1398                  !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1399         ret = 0;
1400         break;
1401     case NL80211_TDLS_DISABLE_LINK:
1402         /*
1403          * The teardown message in ieee80211_tdls_mgmt_teardown() was
1404          * created while the queues were stopped, so it might still be
1405          * pending. Before flushing the queues we need to be sure the
1406          * message is handled by the tasklet handling pending messages,
1407          * otherwise we might start destroying the station before
1408          * sending the teardown packet.
1409          * Note that this only forces the tasklet to flush pendings -
1410          * not to stop the tasklet from rescheduling itself.
1411          */
1412         tasklet_kill(&local->tx_pending_tasklet);
1413         /* flush a potentially queued teardown packet */
1414         ieee80211_flush_queues(local, sdata, false);
1415 
1416         ret = sta_info_destroy_addr(sdata, peer);
1417 
1418         mutex_lock(&local->sta_mtx);
1419         iee80211_tdls_recalc_ht_protection(sdata, NULL);
1420         mutex_unlock(&local->sta_mtx);
1421 
1422         iee80211_tdls_recalc_chanctx(sdata, NULL);
1423         break;
1424     default:
1425         ret = -ENOTSUPP;
1426         break;
1427     }
1428 
1429     if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1430         cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1431         eth_zero_addr(sdata->u.mgd.tdls_peer);
1432     }
1433 
1434     if (ret == 0)
1435         ieee80211_queue_work(&sdata->local->hw,
1436                      &sdata->deflink.u.mgd.request_smps_work);
1437 
1438     mutex_unlock(&local->mtx);
1439     sdata_unlock(sdata);
1440     return ret;
1441 }
1442 
1443 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1444                  enum nl80211_tdls_operation oper,
1445                  u16 reason_code, gfp_t gfp)
1446 {
1447     struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1448 
1449     if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) {
1450         sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1451               oper);
1452         return;
1453     }
1454 
1455     cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1456 }
1457 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1458 
1459 static void
1460 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1461 {
1462     struct ieee80211_ch_switch_timing *ch_sw;
1463 
1464     *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1465     *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1466 
1467     ch_sw = (void *)buf;
1468     ch_sw->switch_time = cpu_to_le16(switch_time);
1469     ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1470 }
1471 
1472 /* find switch timing IE in SKB ready for Tx */
1473 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1474 {
1475     struct ieee80211_tdls_data *tf;
1476     const u8 *ie_start;
1477 
1478     /*
1479      * Get the offset for the new location of the switch timing IE.
1480      * The SKB network header will now point to the "payload_type"
1481      * element of the TDLS data frame struct.
1482      */
1483     tf = container_of(skb->data + skb_network_offset(skb),
1484               struct ieee80211_tdls_data, payload_type);
1485     ie_start = tf->u.chan_switch_req.variable;
1486     return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1487                 skb->len - (ie_start - skb->data));
1488 }
1489 
1490 static struct sk_buff *
1491 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1492                   struct cfg80211_chan_def *chandef,
1493                   u32 *ch_sw_tm_ie_offset)
1494 {
1495     struct ieee80211_sub_if_data *sdata = sta->sdata;
1496     u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1497              2 + sizeof(struct ieee80211_ch_switch_timing)];
1498     int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1499     u8 *pos = extra_ies;
1500     struct sk_buff *skb;
1501 
1502     /*
1503      * if chandef points to a wide channel add a Secondary-Channel
1504      * Offset information element
1505      */
1506     if (chandef->width == NL80211_CHAN_WIDTH_40) {
1507         struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1508         bool ht40plus;
1509 
1510         *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1511         *pos++ = sizeof(*sec_chan_ie);
1512         sec_chan_ie = (void *)pos;
1513 
1514         ht40plus = cfg80211_get_chandef_type(chandef) ==
1515                             NL80211_CHAN_HT40PLUS;
1516         sec_chan_ie->sec_chan_offs = ht40plus ?
1517                          IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1518                          IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1519         pos += sizeof(*sec_chan_ie);
1520 
1521         extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1522     }
1523 
1524     /* just set the values to 0, this is a template */
1525     iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1526 
1527     skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1528                           WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1529                           0, 0, !sta->sta.tdls_initiator,
1530                           extra_ies, extra_ies_len,
1531                           oper_class, chandef);
1532     if (!skb)
1533         return NULL;
1534 
1535     skb = ieee80211_build_data_template(sdata, skb, 0);
1536     if (IS_ERR(skb)) {
1537         tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1538         return NULL;
1539     }
1540 
1541     if (ch_sw_tm_ie_offset) {
1542         const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1543 
1544         if (!tm_ie) {
1545             tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1546             dev_kfree_skb_any(skb);
1547             return NULL;
1548         }
1549 
1550         *ch_sw_tm_ie_offset = tm_ie - skb->data;
1551     }
1552 
1553     tdls_dbg(sdata,
1554          "TDLS channel switch request template for %pM ch %d width %d\n",
1555          sta->sta.addr, chandef->chan->center_freq, chandef->width);
1556     return skb;
1557 }
1558 
1559 int
1560 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1561                   const u8 *addr, u8 oper_class,
1562                   struct cfg80211_chan_def *chandef)
1563 {
1564     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1565     struct ieee80211_local *local = sdata->local;
1566     struct sta_info *sta;
1567     struct sk_buff *skb = NULL;
1568     u32 ch_sw_tm_ie;
1569     int ret;
1570 
1571     if (chandef->chan->freq_offset)
1572         /* this may work, but is untested */
1573         return -EOPNOTSUPP;
1574 
1575     mutex_lock(&local->sta_mtx);
1576     sta = sta_info_get(sdata, addr);
1577     if (!sta) {
1578         tdls_dbg(sdata,
1579              "Invalid TDLS peer %pM for channel switch request\n",
1580              addr);
1581         ret = -ENOENT;
1582         goto out;
1583     }
1584 
1585     if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1586         tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1587              addr);
1588         ret = -ENOTSUPP;
1589         goto out;
1590     }
1591 
1592     skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1593                         &ch_sw_tm_ie);
1594     if (!skb) {
1595         ret = -ENOENT;
1596         goto out;
1597     }
1598 
1599     ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1600                       chandef, skb, ch_sw_tm_ie);
1601     if (!ret)
1602         set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1603 
1604 out:
1605     mutex_unlock(&local->sta_mtx);
1606     dev_kfree_skb_any(skb);
1607     return ret;
1608 }
1609 
1610 void
1611 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1612                      struct net_device *dev,
1613                      const u8 *addr)
1614 {
1615     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1616     struct ieee80211_local *local = sdata->local;
1617     struct sta_info *sta;
1618 
1619     mutex_lock(&local->sta_mtx);
1620     sta = sta_info_get(sdata, addr);
1621     if (!sta) {
1622         tdls_dbg(sdata,
1623              "Invalid TDLS peer %pM for channel switch cancel\n",
1624              addr);
1625         goto out;
1626     }
1627 
1628     if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1629         tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1630              addr);
1631         goto out;
1632     }
1633 
1634     drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1635     clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1636 
1637 out:
1638     mutex_unlock(&local->sta_mtx);
1639 }
1640 
1641 static struct sk_buff *
1642 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1643                    u32 *ch_sw_tm_ie_offset)
1644 {
1645     struct ieee80211_sub_if_data *sdata = sta->sdata;
1646     struct sk_buff *skb;
1647     u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1648 
1649     /* initial timing are always zero in the template */
1650     iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1651 
1652     skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1653                     WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1654                     0, 0, !sta->sta.tdls_initiator,
1655                     extra_ies, sizeof(extra_ies), 0, NULL);
1656     if (!skb)
1657         return NULL;
1658 
1659     skb = ieee80211_build_data_template(sdata, skb, 0);
1660     if (IS_ERR(skb)) {
1661         tdls_dbg(sdata,
1662              "Failed building TDLS channel switch resp frame\n");
1663         return NULL;
1664     }
1665 
1666     if (ch_sw_tm_ie_offset) {
1667         const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1668 
1669         if (!tm_ie) {
1670             tdls_dbg(sdata,
1671                  "No switch timing IE in TDLS switch resp\n");
1672             dev_kfree_skb_any(skb);
1673             return NULL;
1674         }
1675 
1676         *ch_sw_tm_ie_offset = tm_ie - skb->data;
1677     }
1678 
1679     tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1680          sta->sta.addr);
1681     return skb;
1682 }
1683 
1684 static int
1685 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1686                        struct sk_buff *skb)
1687 {
1688     struct ieee80211_local *local = sdata->local;
1689     struct ieee802_11_elems *elems = NULL;
1690     struct sta_info *sta;
1691     struct ieee80211_tdls_data *tf = (void *)skb->data;
1692     bool local_initiator;
1693     struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1694     int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1695     struct ieee80211_tdls_ch_sw_params params = {};
1696     int ret;
1697 
1698     params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1699     params.timestamp = rx_status->device_timestamp;
1700 
1701     if (skb->len < baselen) {
1702         tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1703              skb->len);
1704         return -EINVAL;
1705     }
1706 
1707     mutex_lock(&local->sta_mtx);
1708     sta = sta_info_get(sdata, tf->sa);
1709     if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1710         tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1711              tf->sa);
1712         ret = -EINVAL;
1713         goto out;
1714     }
1715 
1716     params.sta = &sta->sta;
1717     params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1718     if (params.status != 0) {
1719         ret = 0;
1720         goto call_drv;
1721     }
1722 
1723     elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1724                        skb->len - baselen, false, NULL);
1725     if (!elems) {
1726         ret = -ENOMEM;
1727         goto out;
1728     }
1729 
1730     if (elems->parse_error) {
1731         tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1732         ret = -EINVAL;
1733         goto out;
1734     }
1735 
1736     if (!elems->ch_sw_timing || !elems->lnk_id) {
1737         tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1738         ret = -EINVAL;
1739         goto out;
1740     }
1741 
1742     /* validate the initiator is set correctly */
1743     local_initiator =
1744         !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1745     if (local_initiator == sta->sta.tdls_initiator) {
1746         tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1747         ret = -EINVAL;
1748         goto out;
1749     }
1750 
1751     params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1752     params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1753 
1754     params.tmpl_skb =
1755         ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1756     if (!params.tmpl_skb) {
1757         ret = -ENOENT;
1758         goto out;
1759     }
1760 
1761     ret = 0;
1762 call_drv:
1763     drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1764 
1765     tdls_dbg(sdata,
1766          "TDLS channel switch response received from %pM status %d\n",
1767          tf->sa, params.status);
1768 
1769 out:
1770     mutex_unlock(&local->sta_mtx);
1771     dev_kfree_skb_any(params.tmpl_skb);
1772     kfree(elems);
1773     return ret;
1774 }
1775 
1776 static int
1777 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1778                       struct sk_buff *skb)
1779 {
1780     struct ieee80211_local *local = sdata->local;
1781     struct ieee802_11_elems *elems;
1782     struct cfg80211_chan_def chandef;
1783     struct ieee80211_channel *chan;
1784     enum nl80211_channel_type chan_type;
1785     int freq;
1786     u8 target_channel, oper_class;
1787     bool local_initiator;
1788     struct sta_info *sta;
1789     enum nl80211_band band;
1790     struct ieee80211_tdls_data *tf = (void *)skb->data;
1791     struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1792     int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1793     struct ieee80211_tdls_ch_sw_params params = {};
1794     int ret = 0;
1795 
1796     params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1797     params.timestamp = rx_status->device_timestamp;
1798 
1799     if (skb->len < baselen) {
1800         tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1801              skb->len);
1802         return -EINVAL;
1803     }
1804 
1805     target_channel = tf->u.chan_switch_req.target_channel;
1806     oper_class = tf->u.chan_switch_req.oper_class;
1807 
1808     /*
1809      * We can't easily infer the channel band. The operating class is
1810      * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1811      * solution here is to treat channels with number >14 as 5GHz ones,
1812      * and specifically check for the (oper_class, channel) combinations
1813      * where this doesn't hold. These are thankfully unique according to
1814      * IEEE802.11-2012.
1815      * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1816      * valid here.
1817      */
1818     if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1819          oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1820          target_channel < 14)
1821         band = NL80211_BAND_5GHZ;
1822     else
1823         band = target_channel < 14 ? NL80211_BAND_2GHZ :
1824                          NL80211_BAND_5GHZ;
1825 
1826     freq = ieee80211_channel_to_frequency(target_channel, band);
1827     if (freq == 0) {
1828         tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1829              target_channel);
1830         return -EINVAL;
1831     }
1832 
1833     chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1834     if (!chan) {
1835         tdls_dbg(sdata,
1836              "Unsupported channel for TDLS chan switch: %d\n",
1837              target_channel);
1838         return -EINVAL;
1839     }
1840 
1841     elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1842                        skb->len - baselen, false, NULL);
1843     if (!elems)
1844         return -ENOMEM;
1845 
1846     if (elems->parse_error) {
1847         tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1848         ret = -EINVAL;
1849         goto free;
1850     }
1851 
1852     if (!elems->ch_sw_timing || !elems->lnk_id) {
1853         tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1854         ret = -EINVAL;
1855         goto free;
1856     }
1857 
1858     if (!elems->sec_chan_offs) {
1859         chan_type = NL80211_CHAN_HT20;
1860     } else {
1861         switch (elems->sec_chan_offs->sec_chan_offs) {
1862         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1863             chan_type = NL80211_CHAN_HT40PLUS;
1864             break;
1865         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1866             chan_type = NL80211_CHAN_HT40MINUS;
1867             break;
1868         default:
1869             chan_type = NL80211_CHAN_HT20;
1870             break;
1871         }
1872     }
1873 
1874     cfg80211_chandef_create(&chandef, chan, chan_type);
1875 
1876     /* we will be active on the TDLS link */
1877     if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1878                        sdata->wdev.iftype)) {
1879         tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1880         ret = -EINVAL;
1881         goto free;
1882     }
1883 
1884     mutex_lock(&local->sta_mtx);
1885     sta = sta_info_get(sdata, tf->sa);
1886     if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1887         tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1888              tf->sa);
1889         ret = -EINVAL;
1890         goto out;
1891     }
1892 
1893     params.sta = &sta->sta;
1894 
1895     /* validate the initiator is set correctly */
1896     local_initiator =
1897         !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1898     if (local_initiator == sta->sta.tdls_initiator) {
1899         tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1900         ret = -EINVAL;
1901         goto out;
1902     }
1903 
1904     /* peer should have known better */
1905     if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs &&
1906         elems->sec_chan_offs->sec_chan_offs) {
1907         tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1908         ret = -ENOTSUPP;
1909         goto out;
1910     }
1911 
1912     params.chandef = &chandef;
1913     params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1914     params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1915 
1916     params.tmpl_skb =
1917         ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1918                            &params.ch_sw_tm_ie);
1919     if (!params.tmpl_skb) {
1920         ret = -ENOENT;
1921         goto out;
1922     }
1923 
1924     drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1925 
1926     tdls_dbg(sdata,
1927          "TDLS ch switch request received from %pM ch %d width %d\n",
1928          tf->sa, params.chandef->chan->center_freq,
1929          params.chandef->width);
1930 out:
1931     mutex_unlock(&local->sta_mtx);
1932     dev_kfree_skb_any(params.tmpl_skb);
1933 free:
1934     kfree(elems);
1935     return ret;
1936 }
1937 
1938 void
1939 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1940                       struct sk_buff *skb)
1941 {
1942     struct ieee80211_tdls_data *tf = (void *)skb->data;
1943     struct wiphy *wiphy = sdata->local->hw.wiphy;
1944 
1945     lockdep_assert_wiphy(wiphy);
1946 
1947     /* make sure the driver supports it */
1948     if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1949         return;
1950 
1951     /* we want to access the entire packet */
1952     if (skb_linearize(skb))
1953         return;
1954     /*
1955      * The packet/size was already validated by mac80211 Rx path, only look
1956      * at the action type.
1957      */
1958     switch (tf->action_code) {
1959     case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1960         ieee80211_process_tdls_channel_switch_req(sdata, skb);
1961         break;
1962     case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1963         ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1964         break;
1965     default:
1966         WARN_ON_ONCE(1);
1967         return;
1968     }
1969 }
1970 
1971 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1972 {
1973     struct sta_info *sta;
1974     u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1975 
1976     rcu_read_lock();
1977     list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1978         if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1979             !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1980             continue;
1981 
1982         ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1983                         NL80211_TDLS_TEARDOWN, reason,
1984                         GFP_ATOMIC);
1985     }
1986     rcu_read_unlock();
1987 }
1988 
1989 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
1990                       const u8 *peer, u16 reason)
1991 {
1992     struct ieee80211_sta *sta;
1993 
1994     rcu_read_lock();
1995     sta = ieee80211_find_sta(&sdata->vif, peer);
1996     if (!sta || !sta->tdls) {
1997         rcu_read_unlock();
1998         return;
1999     }
2000     rcu_read_unlock();
2001 
2002     tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
2003          peer, reason,
2004          ieee80211_get_reason_code_string(reason));
2005 
2006     ieee80211_tdls_oper_request(&sdata->vif, peer,
2007                     NL80211_TDLS_TEARDOWN,
2008                     WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
2009                     GFP_ATOMIC);
2010 }
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