LXR linux/net/mac80211/tdls.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * mac80211 TDLS handling code
   4 *
   5 * Copyright 2006-2010  Johannes Berg <johannes@sipsolutions.net>
   6 * Copyright 2014, Intel Corporation
   7 * Copyright 2014  Intel Mobile Communications GmbH
   8 * Copyright 2015 - 2016 Intel Deutschland GmbH
   9 * Copyright (C) 2019, 2021 Intel Corporation
  10 */
  11
  12#include <linux/ieee80211.h>
  13#include <linux/log2.h>
  14#include <net/cfg80211.h>
  15#include <linux/rtnetlink.h>
  16#include "ieee80211_i.h"
  17#include "driver-ops.h"
  18#include "rate.h"
  19#include "wme.h"
  20
  21/* give usermode some time for retries in setting up the TDLS session */
  22#define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
  23
  24void ieee80211_tdls_peer_del_work(struct work_struct *wk)
  25{
  26        struct ieee80211_sub_if_data *sdata;
  27        struct ieee80211_local *local;
  28
  29        sdata = container_of(wk, struct ieee80211_sub_if_data,
  30                             u.mgd.tdls_peer_del_work.work);
  31        local = sdata->local;
  32
  33        mutex_lock(&local->mtx);
  34        if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
  35                tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
  36                sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
  37                eth_zero_addr(sdata->u.mgd.tdls_peer);
  38        }
  39        mutex_unlock(&local->mtx);
  40}
  41
  42static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
  43                                         struct sk_buff *skb)
  44{
  45        struct ieee80211_local *local = sdata->local;
  46        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  47        bool chan_switch = local->hw.wiphy->features &
  48                           NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
  49        bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
  50                          !ifmgd->tdls_wider_bw_prohibited;
  51        bool buffer_sta = ieee80211_hw_check(&local->hw,
  52                                             SUPPORTS_TDLS_BUFFER_STA);
  53        struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
  54        bool vht = sband && sband->vht_cap.vht_supported;
  55        u8 *pos = skb_put(skb, 10);
  56
  57        *pos++ = WLAN_EID_EXT_CAPABILITY;
  58        *pos++ = 8; /* len */
  59        *pos++ = 0x0;
  60        *pos++ = 0x0;
  61        *pos++ = 0x0;
  62        *pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) |
  63                 (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0);
  64        *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
  65        *pos++ = 0;
  66        *pos++ = 0;
  67        *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
  68}
  69
  70static u8
  71ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
  72                           struct sk_buff *skb, u16 start, u16 end,
  73                           u16 spacing)
  74{
  75        u8 subband_cnt = 0, ch_cnt = 0;
  76        struct ieee80211_channel *ch;
  77        struct cfg80211_chan_def chandef;
  78        int i, subband_start;
  79        struct wiphy *wiphy = sdata->local->hw.wiphy;
  80
  81        for (i = start; i <= end; i += spacing) {
  82                if (!ch_cnt)
  83                        subband_start = i;
  84
  85                ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
  86                if (ch) {
  87                        /* we will be active on the channel */
  88                        cfg80211_chandef_create(&chandef, ch,
  89                                                NL80211_CHAN_NO_HT);
  90                        if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
  91                                                          sdata->wdev.iftype)) {
  92                                ch_cnt++;
  93                                /*
  94                                 * check if the next channel is also part of
  95                                 * this allowed range
  96                                 */
  97                                continue;
  98                        }
  99                }
 100
 101                /*
 102                 * we've reached the end of a range, with allowed channels
 103                 * found
 104                 */
 105                if (ch_cnt) {
 106                        u8 *pos = skb_put(skb, 2);
 107                        *pos++ = ieee80211_frequency_to_channel(subband_start);
 108                        *pos++ = ch_cnt;
 109
 110                        subband_cnt++;
 111                        ch_cnt = 0;
 112                }
 113        }
 114
 115        /* all channels in the requested range are allowed - add them here */
 116        if (ch_cnt) {
 117                u8 *pos = skb_put(skb, 2);
 118                *pos++ = ieee80211_frequency_to_channel(subband_start);
 119                *pos++ = ch_cnt;
 120
 121                subband_cnt++;
 122        }
 123
 124        return subband_cnt;
 125}
 126
 127static void
 128ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
 129                                 struct sk_buff *skb)
 130{
 131        /*
 132         * Add possible channels for TDLS. These are channels that are allowed
 133         * to be active.
 134         */
 135        u8 subband_cnt;
 136        u8 *pos = skb_put(skb, 2);
 137
 138        *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 139
 140        /*
 141         * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
 142         * this doesn't happen in real world scenarios.
 143         */
 144
 145        /* 2GHz, with 5MHz spacing */
 146        subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
 147
 148        /* 5GHz, with 20MHz spacing */
 149        subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
 150
 151        /* length */
 152        *pos = 2 * subband_cnt;
 153}
 154
 155static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
 156                                            struct sk_buff *skb)
 157{
 158        u8 *pos;
 159        u8 op_class;
 160
 161        if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
 162                                                  &op_class))
 163                return;
 164
 165        pos = skb_put(skb, 4);
 166        *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
 167        *pos++ = 2; /* len */
 168
 169        *pos++ = op_class;
 170        *pos++ = op_class; /* give current operating class as alternate too */
 171}
 172
 173static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
 174{
 175        u8 *pos = skb_put(skb, 3);
 176
 177        *pos++ = WLAN_EID_BSS_COEX_2040;
 178        *pos++ = 1; /* len */
 179
 180        *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
 181}
 182
 183static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
 184                                        u16 status_code)
 185{
 186        struct ieee80211_supported_band *sband;
 187
 188        /* The capability will be 0 when sending a failure code */
 189        if (status_code != 0)
 190                return 0;
 191
 192        sband = ieee80211_get_sband(sdata);
 193        if (sband && sband->band == NL80211_BAND_2GHZ) {
 194                return WLAN_CAPABILITY_SHORT_SLOT_TIME |
 195                       WLAN_CAPABILITY_SHORT_PREAMBLE;
 196        }
 197
 198        return 0;
 199}
 200
 201static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
 202                                       struct sk_buff *skb, const u8 *peer,
 203                                       bool initiator)
 204{
 205        struct ieee80211_tdls_lnkie *lnkid;
 206        const u8 *init_addr, *rsp_addr;
 207
 208        if (initiator) {
 209                init_addr = sdata->vif.addr;
 210                rsp_addr = peer;
 211        } else {
 212                init_addr = peer;
 213                rsp_addr = sdata->vif.addr;
 214        }
 215
 216        lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
 217
 218        lnkid->ie_type = WLAN_EID_LINK_ID;
 219        lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
 220
 221        memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 222        memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
 223        memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
 224}
 225
 226static void
 227ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 228{
 229        u8 *pos = skb_put(skb, 4);
 230
 231        *pos++ = WLAN_EID_AID;
 232        *pos++ = 2; /* len */
 233        put_unaligned_le16(sdata->vif.bss_conf.aid, pos);
 234}
 235
 236/* translate numbering in the WMM parameter IE to the mac80211 notation */
 237static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
 238{
 239        switch (ac) {
 240        default:
 241                WARN_ON_ONCE(1);
 242                fallthrough;
 243        case 0:
 244                return IEEE80211_AC_BE;
 245        case 1:
 246                return IEEE80211_AC_BK;
 247        case 2:
 248                return IEEE80211_AC_VI;
 249        case 3:
 250                return IEEE80211_AC_VO;
 251        }
 252}
 253
 254static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
 255{
 256        u8 ret;
 257
 258        ret = aifsn & 0x0f;
 259        if (acm)
 260                ret |= 0x10;
 261        ret |= (aci << 5) & 0x60;
 262        return ret;
 263}
 264
 265static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
 266{
 267        return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
 268               ((ilog2(cw_max + 1) << 0x4) & 0xf0);
 269}
 270
 271static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
 272                                            struct sk_buff *skb)
 273{
 274        struct ieee80211_wmm_param_ie *wmm;
 275        struct ieee80211_tx_queue_params *txq;
 276        int i;
 277
 278        wmm = skb_put_zero(skb, sizeof(*wmm));
 279
 280        wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
 281        wmm->len = sizeof(*wmm) - 2;
 282
 283        wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
 284        wmm->oui[1] = 0x50;
 285        wmm->oui[2] = 0xf2;
 286        wmm->oui_type = 2; /* WME */
 287        wmm->oui_subtype = 1; /* WME param */
 288        wmm->version = 1; /* WME ver */
 289        wmm->qos_info = 0; /* U-APSD not in use */
 290
 291        /*
 292         * Use the EDCA parameters defined for the BSS, or default if the AP
 293         * doesn't support it, as mandated by 802.11-2012 section 10.22.4
 294         */
 295        for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 296                txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
 297                wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
 298                                                               txq->acm, i);
 299                wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
 300                wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
 301        }
 302}
 303
 304static void
 305ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
 306                                   struct sta_info *sta)
 307{
 308        /* IEEE802.11ac-2013 Table E-4 */
 309        u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
 310        struct cfg80211_chan_def uc = sta->tdls_chandef;
 311        enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
 312        int i;
 313
 314        /* only support upgrading non-narrow channels up to 80Mhz */
 315        if (max_width == NL80211_CHAN_WIDTH_5 ||
 316            max_width == NL80211_CHAN_WIDTH_10)
 317                return;
 318
 319        if (max_width > NL80211_CHAN_WIDTH_80)
 320                max_width = NL80211_CHAN_WIDTH_80;
 321
 322        if (uc.width >= max_width)
 323                return;
 324        /*
 325         * Channel usage constrains in the IEEE802.11ac-2013 specification only
 326         * allow expanding a 20MHz channel to 80MHz in a single way. In
 327         * addition, there are no 40MHz allowed channels that are not part of
 328         * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
 329         */
 330        for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
 331                if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
 332                        uc.center_freq1 = centers_80mhz[i];
 333                        uc.center_freq2 = 0;
 334                        uc.width = NL80211_CHAN_WIDTH_80;
 335                        break;
 336                }
 337
 338        if (!uc.center_freq1)
 339                return;
 340
 341        /* proceed to downgrade the chandef until usable or the same as AP BW */
 342        while (uc.width > max_width ||
 343               (uc.width > sta->tdls_chandef.width &&
 344                !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
 345                                               sdata->wdev.iftype)))
 346                ieee80211_chandef_downgrade(&uc);
 347
 348        if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
 349                tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
 350                         sta->tdls_chandef.width, uc.width);
 351
 352                /*
 353                 * the station is not yet authorized when BW upgrade is done,
 354                 * locking is not required
 355                 */
 356                sta->tdls_chandef = uc;
 357        }
 358}
 359
 360static void
 361ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
 362                                   struct sk_buff *skb, const u8 *peer,
 363                                   u8 action_code, bool initiator,
 364                                   const u8 *extra_ies, size_t extra_ies_len)
 365{
 366        struct ieee80211_supported_band *sband;
 367        struct ieee80211_local *local = sdata->local;
 368        struct ieee80211_sta_ht_cap ht_cap;
 369        struct ieee80211_sta_vht_cap vht_cap;
 370        struct sta_info *sta = NULL;
 371        size_t offset = 0, noffset;
 372        u8 *pos;
 373
 374        sband = ieee80211_get_sband(sdata);
 375        if (!sband)
 376                return;
 377
 378        ieee80211_add_srates_ie(sdata, skb, false, sband->band);
 379        ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
 380        ieee80211_tdls_add_supp_channels(sdata, skb);
 381
 382        /* add any custom IEs that go before Extended Capabilities */
 383        if (extra_ies_len) {
 384                static const u8 before_ext_cap[] = {
 385                        WLAN_EID_SUPP_RATES,
 386                        WLAN_EID_COUNTRY,
 387                        WLAN_EID_EXT_SUPP_RATES,
 388                        WLAN_EID_SUPPORTED_CHANNELS,
 389                        WLAN_EID_RSN,
 390                };
 391                noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 392                                             before_ext_cap,
 393                                             ARRAY_SIZE(before_ext_cap),
 394                                             offset);
 395                skb_put_data(skb, extra_ies + offset, noffset - offset);
 396                offset = noffset;
 397        }
 398
 399        ieee80211_tdls_add_ext_capab(sdata, skb);
 400
 401        /* add the QoS element if we support it */
 402        if (local->hw.queues >= IEEE80211_NUM_ACS &&
 403            action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 404                ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
 405
 406        /* add any custom IEs that go before HT capabilities */
 407        if (extra_ies_len) {
 408                static const u8 before_ht_cap[] = {
 409                        WLAN_EID_SUPP_RATES,
 410                        WLAN_EID_COUNTRY,
 411                        WLAN_EID_EXT_SUPP_RATES,
 412                        WLAN_EID_SUPPORTED_CHANNELS,
 413                        WLAN_EID_RSN,
 414                        WLAN_EID_EXT_CAPABILITY,
 415                        WLAN_EID_QOS_CAPA,
 416                        WLAN_EID_FAST_BSS_TRANSITION,
 417                        WLAN_EID_TIMEOUT_INTERVAL,
 418                        WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 419                };
 420                noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 421                                             before_ht_cap,
 422                                             ARRAY_SIZE(before_ht_cap),
 423                                             offset);
 424                skb_put_data(skb, extra_ies + offset, noffset - offset);
 425                offset = noffset;
 426        }
 427
 428        mutex_lock(&local->sta_mtx);
 429
 430        /* we should have the peer STA if we're already responding */
 431        if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
 432                sta = sta_info_get(sdata, peer);
 433                if (WARN_ON_ONCE(!sta)) {
 434                        mutex_unlock(&local->sta_mtx);
 435                        return;
 436                }
 437
 438                sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 439        }
 440
 441        ieee80211_tdls_add_oper_classes(sdata, skb);
 442
 443        /*
 444         * with TDLS we can switch channels, and HT-caps are not necessarily
 445         * the same on all bands. The specification limits the setup to a
 446         * single HT-cap, so use the current band for now.
 447         */
 448        memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 449
 450        if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 451             action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 452            ht_cap.ht_supported) {
 453                ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 454
 455                /* disable SMPS in TDLS initiator */
 456                ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 457                                << IEEE80211_HT_CAP_SM_PS_SHIFT;
 458
 459                pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 460                ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 461        } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 462                   ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 463                /* the peer caps are already intersected with our own */
 464                memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
 465
 466                pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 467                ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 468        }
 469
 470        if (ht_cap.ht_supported &&
 471            (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 472                ieee80211_tdls_add_bss_coex_ie(skb);
 473
 474        ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 475
 476        /* add any custom IEs that go before VHT capabilities */
 477        if (extra_ies_len) {
 478                static const u8 before_vht_cap[] = {
 479                        WLAN_EID_SUPP_RATES,
 480                        WLAN_EID_COUNTRY,
 481                        WLAN_EID_EXT_SUPP_RATES,
 482                        WLAN_EID_SUPPORTED_CHANNELS,
 483                        WLAN_EID_RSN,
 484                        WLAN_EID_EXT_CAPABILITY,
 485                        WLAN_EID_QOS_CAPA,
 486                        WLAN_EID_FAST_BSS_TRANSITION,
 487                        WLAN_EID_TIMEOUT_INTERVAL,
 488                        WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 489                        WLAN_EID_MULTI_BAND,
 490                };
 491                noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 492                                             before_vht_cap,
 493                                             ARRAY_SIZE(before_vht_cap),
 494                                             offset);
 495                skb_put_data(skb, extra_ies + offset, noffset - offset);
 496                offset = noffset;
 497        }
 498
 499        /* build the VHT-cap similarly to the HT-cap */
 500        memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 501        if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 502             action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 503            vht_cap.vht_supported) {
 504                ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 505
 506                /* the AID is present only when VHT is implemented */
 507                if (action_code == WLAN_TDLS_SETUP_REQUEST)
 508                        ieee80211_tdls_add_aid(sdata, skb);
 509
 510                pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 511                ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 512        } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 513                   vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
 514                /* the peer caps are already intersected with our own */
 515                memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
 516
 517                /* the AID is present only when VHT is implemented */
 518                ieee80211_tdls_add_aid(sdata, skb);
 519
 520                pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 521                ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 522
 523                /*
 524                 * if both peers support WIDER_BW, we can expand the chandef to
 525                 * a wider compatible one, up to 80MHz
 526                 */
 527                if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 528                        ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 529        }
 530
 531        mutex_unlock(&local->sta_mtx);
 532
 533        /* add any remaining IEs */
 534        if (extra_ies_len) {
 535                noffset = extra_ies_len;
 536                skb_put_data(skb, extra_ies + offset, noffset - offset);
 537        }
 538
 539}
 540
 541static void
 542ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
 543                                 struct sk_buff *skb, const u8 *peer,
 544                                 bool initiator, const u8 *extra_ies,
 545                                 size_t extra_ies_len)
 546{
 547        struct ieee80211_local *local = sdata->local;
 548        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 549        size_t offset = 0, noffset;
 550        struct sta_info *sta, *ap_sta;
 551        struct ieee80211_supported_band *sband;
 552        u8 *pos;
 553
 554        sband = ieee80211_get_sband(sdata);
 555        if (!sband)
 556                return;
 557
 558        mutex_lock(&local->sta_mtx);
 559
 560        sta = sta_info_get(sdata, peer);
 561        ap_sta = sta_info_get(sdata, ifmgd->bssid);
 562        if (WARN_ON_ONCE(!sta || !ap_sta)) {
 563                mutex_unlock(&local->sta_mtx);
 564                return;
 565        }
 566
 567        sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 568
 569        /* add any custom IEs that go before the QoS IE */
 570        if (extra_ies_len) {
 571                static const u8 before_qos[] = {
 572                        WLAN_EID_RSN,
 573                };
 574                noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 575                                             before_qos,
 576                                             ARRAY_SIZE(before_qos),
 577                                             offset);
 578                skb_put_data(skb, extra_ies + offset, noffset - offset);
 579                offset = noffset;
 580        }
 581
 582        /* add the QoS param IE if both the peer and we support it */
 583        if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 584                ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 585
 586        /* add any custom IEs that go before HT operation */
 587        if (extra_ies_len) {
 588                static const u8 before_ht_op[] = {
 589                        WLAN_EID_RSN,
 590                        WLAN_EID_QOS_CAPA,
 591                        WLAN_EID_FAST_BSS_TRANSITION,
 592                        WLAN_EID_TIMEOUT_INTERVAL,
 593                };
 594                noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 595                                             before_ht_op,
 596                                             ARRAY_SIZE(before_ht_op),
 597                                             offset);
 598                skb_put_data(skb, extra_ies + offset, noffset - offset);
 599                offset = noffset;
 600        }
 601
 602        /*
 603         * if HT support is only added in TDLS, we need an HT-operation IE.
 604         * add the IE as required by IEEE802.11-2012 9.23.3.2.
 605         */
 606        if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 607                u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
 608                           IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
 609                           IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
 610
 611                pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 612                ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
 613                                           &sdata->vif.bss_conf.chandef, prot,
 614                                           true);
 615        }
 616
 617        ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 618
 619        /* only include VHT-operation if not on the 2.4GHz band */
 620        if (sband->band != NL80211_BAND_2GHZ &&
 621            sta->sta.vht_cap.vht_supported) {
 622                /*
 623                 * if both peers support WIDER_BW, we can expand the chandef to
 624                 * a wider compatible one, up to 80MHz
 625                 */
 626                if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 627                        ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 628
 629                pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 630                ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
 631                                            &sta->tdls_chandef);
 632        }
 633
 634        mutex_unlock(&local->sta_mtx);
 635
 636        /* add any remaining IEs */
 637        if (extra_ies_len) {
 638                noffset = extra_ies_len;
 639                skb_put_data(skb, extra_ies + offset, noffset - offset);
 640        }
 641}
 642
 643static void
 644ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
 645                                       struct sk_buff *skb, const u8 *peer,
 646                                       bool initiator, const u8 *extra_ies,
 647                                       size_t extra_ies_len, u8 oper_class,
 648                                       struct cfg80211_chan_def *chandef)
 649{
 650        struct ieee80211_tdls_data *tf;
 651        size_t offset = 0, noffset;
 652
 653        if (WARN_ON_ONCE(!chandef))
 654                return;
 655
 656        tf = (void *)skb->data;
 657        tf->u.chan_switch_req.target_channel =
 658                ieee80211_frequency_to_channel(chandef->chan->center_freq);
 659        tf->u.chan_switch_req.oper_class = oper_class;
 660
 661        if (extra_ies_len) {
 662                static const u8 before_lnkie[] = {
 663                        WLAN_EID_SECONDARY_CHANNEL_OFFSET,
 664                };
 665                noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 666                                             before_lnkie,
 667                                             ARRAY_SIZE(before_lnkie),
 668                                             offset);
 669                skb_put_data(skb, extra_ies + offset, noffset - offset);
 670                offset = noffset;
 671        }
 672
 673        ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 674
 675        /* add any remaining IEs */
 676        if (extra_ies_len) {
 677                noffset = extra_ies_len;
 678                skb_put_data(skb, extra_ies + offset, noffset - offset);
 679        }
 680}
 681
 682static void
 683ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
 684                                        struct sk_buff *skb, const u8 *peer,
 685                                        u16 status_code, bool initiator,
 686                                        const u8 *extra_ies,
 687                                        size_t extra_ies_len)
 688{
 689        if (status_code == 0)
 690                ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 691
 692        if (extra_ies_len)
 693                skb_put_data(skb, extra_ies, extra_ies_len);
 694}
 695
 696static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
 697                                   struct sk_buff *skb, const u8 *peer,
 698                                   u8 action_code, u16 status_code,
 699                                   bool initiator, const u8 *extra_ies,
 700                                   size_t extra_ies_len, u8 oper_class,
 701                                   struct cfg80211_chan_def *chandef)
 702{
 703        switch (action_code) {
 704        case WLAN_TDLS_SETUP_REQUEST:
 705        case WLAN_TDLS_SETUP_RESPONSE:
 706        case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 707                if (status_code == 0)
 708                        ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
 709                                                           action_code,
 710                                                           initiator,
 711                                                           extra_ies,
 712                                                           extra_ies_len);
 713                break;
 714        case WLAN_TDLS_SETUP_CONFIRM:
 715                if (status_code == 0)
 716                        ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
 717                                                         initiator, extra_ies,
 718                                                         extra_ies_len);
 719                break;
 720        case WLAN_TDLS_TEARDOWN:
 721        case WLAN_TDLS_DISCOVERY_REQUEST:
 722                if (extra_ies_len)
 723                        skb_put_data(skb, extra_ies, extra_ies_len);
 724                if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
 725                        ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 726                break;
 727        case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 728                ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
 729                                                       initiator, extra_ies,
 730                                                       extra_ies_len,
 731                                                       oper_class, chandef);
 732                break;
 733        case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 734                ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
 735                                                        status_code,
 736                                                        initiator, extra_ies,
 737                                                        extra_ies_len);
 738                break;
 739        }
 740
 741}
 742
 743static int
 744ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 745                               const u8 *peer, u8 action_code, u8 dialog_token,
 746                               u16 status_code, struct sk_buff *skb)
 747{
 748        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 749        struct ieee80211_tdls_data *tf;
 750
 751        tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
 752
 753        memcpy(tf->da, peer, ETH_ALEN);
 754        memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
 755        tf->ether_type = cpu_to_be16(ETH_P_TDLS);
 756        tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
 757
 758        /* network header is after the ethernet header */
 759        skb_set_network_header(skb, ETH_HLEN);
 760
 761        switch (action_code) {
 762        case WLAN_TDLS_SETUP_REQUEST:
 763                tf->category = WLAN_CATEGORY_TDLS;
 764                tf->action_code = WLAN_TDLS_SETUP_REQUEST;
 765
 766                skb_put(skb, sizeof(tf->u.setup_req));
 767                tf->u.setup_req.dialog_token = dialog_token;
 768                tf->u.setup_req.capability =
 769                        cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 770                                                                 status_code));
 771                break;
 772        case WLAN_TDLS_SETUP_RESPONSE:
 773                tf->category = WLAN_CATEGORY_TDLS;
 774                tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
 775
 776                skb_put(skb, sizeof(tf->u.setup_resp));
 777                tf->u.setup_resp.status_code = cpu_to_le16(status_code);
 778                tf->u.setup_resp.dialog_token = dialog_token;
 779                tf->u.setup_resp.capability =
 780                        cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 781                                                                 status_code));
 782                break;
 783        case WLAN_TDLS_SETUP_CONFIRM:
 784                tf->category = WLAN_CATEGORY_TDLS;
 785                tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
 786
 787                skb_put(skb, sizeof(tf->u.setup_cfm));
 788                tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
 789                tf->u.setup_cfm.dialog_token = dialog_token;
 790                break;
 791        case WLAN_TDLS_TEARDOWN:
 792                tf->category = WLAN_CATEGORY_TDLS;
 793                tf->action_code = WLAN_TDLS_TEARDOWN;
 794
 795                skb_put(skb, sizeof(tf->u.teardown));
 796                tf->u.teardown.reason_code = cpu_to_le16(status_code);
 797                break;
 798        case WLAN_TDLS_DISCOVERY_REQUEST:
 799                tf->category = WLAN_CATEGORY_TDLS;
 800                tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
 801
 802                skb_put(skb, sizeof(tf->u.discover_req));
 803                tf->u.discover_req.dialog_token = dialog_token;
 804                break;
 805        case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 806                tf->category = WLAN_CATEGORY_TDLS;
 807                tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
 808
 809                skb_put(skb, sizeof(tf->u.chan_switch_req));
 810                break;
 811        case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 812                tf->category = WLAN_CATEGORY_TDLS;
 813                tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
 814
 815                skb_put(skb, sizeof(tf->u.chan_switch_resp));
 816                tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
 817                break;
 818        default:
 819                return -EINVAL;
 820        }
 821
 822        return 0;
 823}
 824
 825static int
 826ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 827                           const u8 *peer, u8 action_code, u8 dialog_token,
 828                           u16 status_code, struct sk_buff *skb)
 829{
 830        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 831        struct ieee80211_mgmt *mgmt;
 832
 833        mgmt = skb_put_zero(skb, 24);
 834        memcpy(mgmt->da, peer, ETH_ALEN);
 835        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 836        memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 837
 838        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 839                                          IEEE80211_STYPE_ACTION);
 840
 841        switch (action_code) {
 842        case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 843                skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
 844                mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
 845                mgmt->u.action.u.tdls_discover_resp.action_code =
 846                        WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
 847                mgmt->u.action.u.tdls_discover_resp.dialog_token =
 848                        dialog_token;
 849                mgmt->u.action.u.tdls_discover_resp.capability =
 850                        cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 851                                                                 status_code));
 852                break;
 853        default:
 854                return -EINVAL;
 855        }
 856
 857        return 0;
 858}
 859
 860static struct sk_buff *
 861ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
 862                                      const u8 *peer, u8 action_code,
 863                                      u8 dialog_token, u16 status_code,
 864                                      bool initiator, const u8 *extra_ies,
 865                                      size_t extra_ies_len, u8 oper_class,
 866                                      struct cfg80211_chan_def *chandef)
 867{
 868        struct ieee80211_local *local = sdata->local;
 869        struct sk_buff *skb;
 870        int ret;
 871
 872        skb = netdev_alloc_skb(sdata->dev,
 873                               local->hw.extra_tx_headroom +
 874                               max(sizeof(struct ieee80211_mgmt),
 875                                   sizeof(struct ieee80211_tdls_data)) +
 876                               50 + /* supported rates */
 877                               10 + /* ext capab */
 878                               26 + /* max(WMM-info, WMM-param) */
 879                               2 + max(sizeof(struct ieee80211_ht_cap),
 880                                       sizeof(struct ieee80211_ht_operation)) +
 881                               2 + max(sizeof(struct ieee80211_vht_cap),
 882                                       sizeof(struct ieee80211_vht_operation)) +
 883                               50 + /* supported channels */
 884                               3 + /* 40/20 BSS coex */
 885                               4 + /* AID */
 886                               4 + /* oper classes */
 887                               extra_ies_len +
 888                               sizeof(struct ieee80211_tdls_lnkie));
 889        if (!skb)
 890                return NULL;
 891
 892        skb_reserve(skb, local->hw.extra_tx_headroom);
 893
 894        switch (action_code) {
 895        case WLAN_TDLS_SETUP_REQUEST:
 896        case WLAN_TDLS_SETUP_RESPONSE:
 897        case WLAN_TDLS_SETUP_CONFIRM:
 898        case WLAN_TDLS_TEARDOWN:
 899        case WLAN_TDLS_DISCOVERY_REQUEST:
 900        case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 901        case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 902                ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
 903                                                     sdata->dev, peer,
 904                                                     action_code, dialog_token,
 905                                                     status_code, skb);
 906                break;
 907        case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 908                ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
 909                                                 peer, action_code,
 910                                                 dialog_token, status_code,
 911                                                 skb);
 912                break;
 913        default:
 914                ret = -ENOTSUPP;
 915                break;
 916        }
 917
 918        if (ret < 0)
 919                goto fail;
 920
 921        ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
 922                               initiator, extra_ies, extra_ies_len, oper_class,
 923                               chandef);
 924        return skb;
 925
 926fail:
 927        dev_kfree_skb(skb);
 928        return NULL;
 929}
 930
 931static int
 932ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
 933                                const u8 *peer, u8 action_code, u8 dialog_token,
 934                                u16 status_code, u32 peer_capability,
 935                                bool initiator, const u8 *extra_ies,
 936                                size_t extra_ies_len, u8 oper_class,
 937                                struct cfg80211_chan_def *chandef)
 938{
 939        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 940        struct sk_buff *skb = NULL;
 941        struct sta_info *sta;
 942        u32 flags = 0;
 943        int ret = 0;
 944
 945        rcu_read_lock();
 946        sta = sta_info_get(sdata, peer);
 947
 948        /* infer the initiator if we can, to support old userspace */
 949        switch (action_code) {
 950        case WLAN_TDLS_SETUP_REQUEST:
 951                if (sta) {
 952                        set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 953                        sta->sta.tdls_initiator = false;
 954                }
 955                fallthrough;
 956        case WLAN_TDLS_SETUP_CONFIRM:
 957        case WLAN_TDLS_DISCOVERY_REQUEST:
 958                initiator = true;
 959                break;
 960        case WLAN_TDLS_SETUP_RESPONSE:
 961                /*
 962                 * In some testing scenarios, we send a request and response.
 963                 * Make the last packet sent take effect for the initiator
 964                 * value.
 965                 */
 966                if (sta) {
 967                        clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 968                        sta->sta.tdls_initiator = true;
 969                }
 970                fallthrough;
 971        case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 972                initiator = false;
 973                break;
 974        case WLAN_TDLS_TEARDOWN:
 975        case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 976        case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 977                /* any value is ok */
 978                break;
 979        default:
 980                ret = -ENOTSUPP;
 981                break;
 982        }
 983
 984        if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
 985                initiator = true;
 986
 987        rcu_read_unlock();
 988        if (ret < 0)
 989                goto fail;
 990
 991        skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
 992                                                    dialog_token, status_code,
 993                                                    initiator, extra_ies,
 994                                                    extra_ies_len, oper_class,
 995                                                    chandef);
 996        if (!skb) {
 997                ret = -EINVAL;
 998                goto fail;
 999        }
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, 0, NULL);
1058        local_bh_enable();
1059
1060        return ret;
1061
1062fail:
1063        dev_kfree_skb(skb);
1064        return ret;
1065}
1066
1067static int
1068ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1069                          const u8 *peer, u8 action_code, u8 dialog_token,
1070                          u16 status_code, u32 peer_capability, bool initiator,
1071                          const u8 *extra_ies, size_t extra_ies_len)
1072{
1073        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1074        struct ieee80211_local *local = sdata->local;
1075        enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1076        int ret;
1077
1078        /* don't support setup with forced SMPS mode that's not off */
1079        if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1080            smps_mode != IEEE80211_SMPS_OFF) {
1081                tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1082                         smps_mode);
1083                return -ENOTSUPP;
1084        }
1085
1086        mutex_lock(&local->mtx);
1087
1088        /* we don't support concurrent TDLS peer setups */
1089        if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1090            !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1091                ret = -EBUSY;
1092                goto out_unlock;
1093        }
1094
1095        /*
1096         * make sure we have a STA representing the peer so we drop or buffer
1097         * non-TDLS-setup frames to the peer. We can't send other packets
1098         * during setup through the AP path.
1099         * Allow error packets to be sent - sometimes we don't even add a STA
1100         * before failing the setup.
1101         */
1102        if (status_code == 0) {
1103                rcu_read_lock();
1104                if (!sta_info_get(sdata, peer)) {
1105                        rcu_read_unlock();
1106                        ret = -ENOLINK;
1107                        goto out_unlock;
1108                }
1109                rcu_read_unlock();
1110        }
1111
1112        ieee80211_flush_queues(local, sdata, false);
1113        memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1114        mutex_unlock(&local->mtx);
1115
1116        /* we cannot take the mutex while preparing the setup packet */
1117        ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1118                                              dialog_token, status_code,
1119                                              peer_capability, initiator,
1120                                              extra_ies, extra_ies_len, 0,
1121                                              NULL);
1122        if (ret < 0) {
1123                mutex_lock(&local->mtx);
1124                eth_zero_addr(sdata->u.mgd.tdls_peer);
1125                mutex_unlock(&local->mtx);
1126                return ret;
1127        }
1128
1129        ieee80211_queue_delayed_work(&sdata->local->hw,
1130                                     &sdata->u.mgd.tdls_peer_del_work,
1131                                     TDLS_PEER_SETUP_TIMEOUT);
1132        return 0;
1133
1134out_unlock:
1135        mutex_unlock(&local->mtx);
1136        return ret;
1137}
1138
1139static int
1140ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1141                             const u8 *peer, u8 action_code, u8 dialog_token,
1142                             u16 status_code, u32 peer_capability,
1143                             bool initiator, const u8 *extra_ies,
1144                             size_t extra_ies_len)
1145{
1146        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1147        struct ieee80211_local *local = sdata->local;
1148        struct sta_info *sta;
1149        int ret;
1150
1151        /*
1152         * No packets can be transmitted to the peer via the AP during setup -
1153         * the STA is set as a TDLS peer, but is not authorized.
1154         * During teardown, we prevent direct transmissions by stopping the
1155         * queues and flushing all direct packets.
1156         */
1157        ieee80211_stop_vif_queues(local, sdata,
1158                                  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1159        ieee80211_flush_queues(local, sdata, false);
1160
1161        ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1162                                              dialog_token, status_code,
1163                                              peer_capability, initiator,
1164                                              extra_ies, extra_ies_len, 0,
1165                                              NULL);
1166        if (ret < 0)
1167                sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1168                          ret);
1169
1170        /*
1171         * Remove the STA AUTH flag to force further traffic through the AP. If
1172         * the STA was unreachable, it was already removed.
1173         */
1174        rcu_read_lock();
1175        sta = sta_info_get(sdata, peer);
1176        if (sta)
1177                clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1178        rcu_read_unlock();
1179
1180        ieee80211_wake_vif_queues(local, sdata,
1181                                  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1182
1183        return 0;
1184}
1185
1186int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1187                        const u8 *peer, u8 action_code, u8 dialog_token,
1188                        u16 status_code, u32 peer_capability,
1189                        bool initiator, const u8 *extra_ies,
1190                        size_t extra_ies_len)
1191{
1192        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1193        int ret;
1194
1195        if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1196                return -ENOTSUPP;
1197
1198        /* make sure we are in managed mode, and associated */
1199        if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1200            !sdata->u.mgd.associated)
1201                return -EINVAL;
1202
1203        switch (action_code) {
1204        case WLAN_TDLS_SETUP_REQUEST:
1205        case WLAN_TDLS_SETUP_RESPONSE:
1206                ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1207                                                dialog_token, status_code,
1208                                                peer_capability, initiator,
1209                                                extra_ies, extra_ies_len);
1210                break;
1211        case WLAN_TDLS_TEARDOWN:
1212                ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1213                                                   action_code, dialog_token,
1214                                                   status_code,
1215                                                   peer_capability, initiator,
1216                                                   extra_ies, extra_ies_len);
1217                break;
1218        case WLAN_TDLS_DISCOVERY_REQUEST:
1219                /*
1220                 * Protect the discovery so we can hear the TDLS discovery
1221                 * response frame. It is transmitted directly and not buffered
1222                 * by the AP.
1223                 */
1224                drv_mgd_protect_tdls_discover(sdata->local, sdata);
1225                fallthrough;
1226        case WLAN_TDLS_SETUP_CONFIRM:
1227        case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1228                /* no special handling */
1229                ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1230                                                      action_code,
1231                                                      dialog_token,
1232                                                      status_code,
1233                                                      peer_capability,
1234                                                      initiator, extra_ies,
1235                                                      extra_ies_len, 0, NULL);
1236                break;
1237        default:
1238                ret = -EOPNOTSUPP;
1239                break;
1240        }
1241
1242        tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1243                 action_code, peer, ret);
1244        return ret;
1245}
1246
1247static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1248                                         struct sta_info *sta)
1249{
1250        struct ieee80211_local *local = sdata->local;
1251        struct ieee80211_chanctx_conf *conf;
1252        struct ieee80211_chanctx *ctx;
1253        enum nl80211_chan_width width;
1254        struct ieee80211_supported_band *sband;
1255
1256        mutex_lock(&local->chanctx_mtx);
1257        conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1258                                         lockdep_is_held(&local->chanctx_mtx));
1259        if (conf) {
1260                width = conf->def.width;
1261                sband = local->hw.wiphy->bands[conf->def.chan->band];
1262                ctx = container_of(conf, struct ieee80211_chanctx, conf);
1263                ieee80211_recalc_chanctx_chantype(local, ctx);
1264
1265                /* if width changed and a peer is given, update its BW */
1266                if (width != conf->def.width && sta &&
1267                    test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1268                        enum ieee80211_sta_rx_bandwidth bw;
1269
1270                        bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1271                        bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1272                        if (bw != sta->sta.bandwidth) {
1273                                sta->sta.bandwidth = bw;
1274                                rate_control_rate_update(local, sband, sta,
1275                                                         IEEE80211_RC_BW_CHANGED);
1276                                /*
1277                                 * if a TDLS peer BW was updated, we need to
1278                                 * recalc the chandef width again, to get the
1279                                 * correct chanctx min_def
1280                                 */
1281                                ieee80211_recalc_chanctx_chantype(local, ctx);
1282                        }
1283                }
1284
1285        }
1286        mutex_unlock(&local->chanctx_mtx);
1287}
1288
1289static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1290{
1291        struct sta_info *sta;
1292        bool result = false;
1293
1294        rcu_read_lock();
1295        list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1296                if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1297                    !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1298                    !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1299                    !sta->sta.ht_cap.ht_supported)
1300                        continue;
1301                result = true;
1302                break;
1303        }
1304        rcu_read_unlock();
1305
1306        return result;
1307}
1308
1309static void
1310iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1311                                   struct sta_info *sta)
1312{
1313        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1314        bool tdls_ht;
1315        u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1316                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1317                         IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1318        u16 opmode;
1319
1320        /* Nothing to do if the BSS connection uses HT */
1321        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1322                return;
1323
1324        tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1325                  iee80211_tdls_have_ht_peers(sdata);
1326
1327        opmode = sdata->vif.bss_conf.ht_operation_mode;
1328
1329        if (tdls_ht)
1330                opmode |= protection;
1331        else
1332                opmode &= ~protection;
1333
1334        if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1335                return;
1336
1337        sdata->vif.bss_conf.ht_operation_mode = opmode;
1338        ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1339}
1340
1341int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1342                        const u8 *peer, enum nl80211_tdls_operation oper)
1343{
1344        struct sta_info *sta;
1345        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1346        struct ieee80211_local *local = sdata->local;
1347        int ret;
1348
1349        if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1350                return -ENOTSUPP;
1351
1352        if (sdata->vif.type != NL80211_IFTYPE_STATION)
1353                return -EINVAL;
1354
1355        switch (oper) {
1356        case NL80211_TDLS_ENABLE_LINK:
1357        case NL80211_TDLS_DISABLE_LINK:
1358                break;
1359        case NL80211_TDLS_TEARDOWN:
1360        case NL80211_TDLS_SETUP:
1361        case NL80211_TDLS_DISCOVERY_REQ:
1362                /* We don't support in-driver setup/teardown/discovery */
1363                return -ENOTSUPP;
1364        }
1365
1366        /* protect possible bss_conf changes and avoid concurrency in
1367         * ieee80211_bss_info_change_notify()
1368         */
1369        sdata_lock(sdata);
1370        mutex_lock(&local->mtx);
1371        tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1372
1373        switch (oper) {
1374        case NL80211_TDLS_ENABLE_LINK:
1375                if (sdata->vif.csa_active) {
1376                        tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1377                        ret = -EBUSY;
1378                        break;
1379                }
1380
1381                mutex_lock(&local->sta_mtx);
1382                sta = sta_info_get(sdata, peer);
1383                if (!sta) {
1384                        mutex_unlock(&local->sta_mtx);
1385                        ret = -ENOLINK;
1386                        break;
1387                }
1388
1389                iee80211_tdls_recalc_chanctx(sdata, sta);
1390                iee80211_tdls_recalc_ht_protection(sdata, sta);
1391
1392                set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1393                mutex_unlock(&local->sta_mtx);
1394
1395                WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1396                             !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1397                ret = 0;
1398                break;
1399        case NL80211_TDLS_DISABLE_LINK:
1400                /*
1401                 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1402                 * created while the queues were stopped, so it might still be
1403                 * pending. Before flushing the queues we need to be sure the
1404                 * message is handled by the tasklet handling pending messages,
1405                 * otherwise we might start destroying the station before
1406                 * sending the teardown packet.
1407                 * Note that this only forces the tasklet to flush pendings -
1408                 * not to stop the tasklet from rescheduling itself.
1409                 */
1410                tasklet_kill(&local->tx_pending_tasklet);
1411                /* flush a potentially queued teardown packet */
1412                ieee80211_flush_queues(local, sdata, false);
1413
1414                ret = sta_info_destroy_addr(sdata, peer);
1415
1416                mutex_lock(&local->sta_mtx);
1417                iee80211_tdls_recalc_ht_protection(sdata, NULL);
1418                mutex_unlock(&local->sta_mtx);
1419
1420                iee80211_tdls_recalc_chanctx(sdata, NULL);
1421                break;
1422        default:
1423                ret = -ENOTSUPP;
1424                break;
1425        }
1426
1427        if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1428                cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1429                eth_zero_addr(sdata->u.mgd.tdls_peer);
1430        }
1431
1432        if (ret == 0)
1433                ieee80211_queue_work(&sdata->local->hw,
1434                                     &sdata->u.mgd.request_smps_work);
1435
1436        mutex_unlock(&local->mtx);
1437        sdata_unlock(sdata);
1438        return ret;
1439}
1440
1441void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1442                                 enum nl80211_tdls_operation oper,
1443                                 u16 reason_code, gfp_t gfp)
1444{
1445        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1446
1447        if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1448                sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1449                          oper);
1450                return;
1451        }
1452
1453        cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1454}
1455EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1456
1457static void
1458iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1459{
1460        struct ieee80211_ch_switch_timing *ch_sw;
1461
1462        *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1463        *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1464
1465        ch_sw = (void *)buf;
1466        ch_sw->switch_time = cpu_to_le16(switch_time);
1467        ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1468}
1469
1470/* find switch timing IE in SKB ready for Tx */
1471static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1472{
1473        struct ieee80211_tdls_data *tf;
1474        const u8 *ie_start;
1475
1476        /*
1477         * Get the offset for the new location of the switch timing IE.
1478         * The SKB network header will now point to the "payload_type"
1479         * element of the TDLS data frame struct.
1480         */
1481        tf = container_of(skb->data + skb_network_offset(skb),
1482                          struct ieee80211_tdls_data, payload_type);
1483        ie_start = tf->u.chan_switch_req.variable;
1484        return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1485                                skb->len - (ie_start - skb->data));
1486}
1487
1488static struct sk_buff *
1489ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1490                              struct cfg80211_chan_def *chandef,
1491                              u32 *ch_sw_tm_ie_offset)
1492{
1493        struct ieee80211_sub_if_data *sdata = sta->sdata;
1494        u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1495                     2 + sizeof(struct ieee80211_ch_switch_timing)];
1496        int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1497        u8 *pos = extra_ies;
1498        struct sk_buff *skb;
1499
1500        /*
1501         * if chandef points to a wide channel add a Secondary-Channel
1502         * Offset information element
1503         */
1504        if (chandef->width == NL80211_CHAN_WIDTH_40) {
1505                struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1506                bool ht40plus;
1507
1508                *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1509                *pos++ = sizeof(*sec_chan_ie);
1510                sec_chan_ie = (void *)pos;
1511
1512                ht40plus = cfg80211_get_chandef_type(chandef) ==
1513                                                        NL80211_CHAN_HT40PLUS;
1514                sec_chan_ie->sec_chan_offs = ht40plus ?
1515                                             IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1516                                             IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1517                pos += sizeof(*sec_chan_ie);
1518
1519                extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1520        }
1521
1522        /* just set the values to 0, this is a template */
1523        iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1524
1525        skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1526                                              WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1527                                              0, 0, !sta->sta.tdls_initiator,
1528                                              extra_ies, extra_ies_len,
1529                                              oper_class, chandef);
1530        if (!skb)
1531                return NULL;
1532
1533        skb = ieee80211_build_data_template(sdata, skb, 0);
1534        if (IS_ERR(skb)) {
1535                tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1536                return NULL;
1537        }
1538
1539        if (ch_sw_tm_ie_offset) {
1540                const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1541
1542                if (!tm_ie) {
1543                        tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1544                        dev_kfree_skb_any(skb);
1545                        return NULL;
1546                }
1547
1548                *ch_sw_tm_ie_offset = tm_ie - skb->data;
1549        }
1550
1551        tdls_dbg(sdata,
1552                 "TDLS channel switch request template for %pM ch %d width %d\n",
1553                 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1554        return skb;
1555}
1556
1557int
1558ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1559                              const u8 *addr, u8 oper_class,
1560                              struct cfg80211_chan_def *chandef)
1561{
1562        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1563        struct ieee80211_local *local = sdata->local;
1564        struct sta_info *sta;
1565        struct sk_buff *skb = NULL;
1566        u32 ch_sw_tm_ie;
1567        int ret;
1568
1569        if (chandef->chan->freq_offset)
1570                /* this may work, but is untested */
1571                return -EOPNOTSUPP;
1572
1573        mutex_lock(&local->sta_mtx);
1574        sta = sta_info_get(sdata, addr);
1575        if (!sta) {
1576                tdls_dbg(sdata,
1577                         "Invalid TDLS peer %pM for channel switch request\n",
1578                         addr);
1579                ret = -ENOENT;
1580                goto out;
1581        }
1582
1583        if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1584                tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1585                         addr);
1586                ret = -ENOTSUPP;
1587                goto out;
1588        }
1589
1590        skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1591                                            &ch_sw_tm_ie);
1592        if (!skb) {
1593                ret = -ENOENT;
1594                goto out;
1595        }
1596
1597        ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1598                                      chandef, skb, ch_sw_tm_ie);
1599        if (!ret)
1600                set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1601
1602out:
1603        mutex_unlock(&local->sta_mtx);
1604        dev_kfree_skb_any(skb);
1605        return ret;
1606}
1607
1608void
1609ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1610                                     struct net_device *dev,
1611                                     const u8 *addr)
1612{
1613        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1614        struct ieee80211_local *local = sdata->local;
1615        struct sta_info *sta;
1616
1617        mutex_lock(&local->sta_mtx);
1618        sta = sta_info_get(sdata, addr);
1619        if (!sta) {
1620                tdls_dbg(sdata,
1621                         "Invalid TDLS peer %pM for channel switch cancel\n",
1622                         addr);
1623                goto out;
1624        }
1625
1626        if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1627                tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1628                         addr);
1629                goto out;
1630        }
1631
1632        drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1633        clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1634
1635out:
1636        mutex_unlock(&local->sta_mtx);
1637}
1638
1639static struct sk_buff *
1640ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1641                                   u32 *ch_sw_tm_ie_offset)
1642{
1643        struct ieee80211_sub_if_data *sdata = sta->sdata;
1644        struct sk_buff *skb;
1645        u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1646
1647        /* initial timing are always zero in the template */
1648        iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1649
1650        skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1651                                        WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1652                                        0, 0, !sta->sta.tdls_initiator,
1653                                        extra_ies, sizeof(extra_ies), 0, NULL);
1654        if (!skb)
1655                return NULL;
1656
1657        skb = ieee80211_build_data_template(sdata, skb, 0);
1658        if (IS_ERR(skb)) {
1659                tdls_dbg(sdata,
1660                         "Failed building TDLS channel switch resp frame\n");
1661                return NULL;
1662        }
1663
1664        if (ch_sw_tm_ie_offset) {
1665                const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1666
1667                if (!tm_ie) {
1668                        tdls_dbg(sdata,
1669                                 "No switch timing IE in TDLS switch resp\n");
1670                        dev_kfree_skb_any(skb);
1671                        return NULL;
1672                }
1673
1674                *ch_sw_tm_ie_offset = tm_ie - skb->data;
1675        }
1676
1677        tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1678                 sta->sta.addr);
1679        return skb;
1680}
1681
1682static int
1683ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1684                                           struct sk_buff *skb)
1685{
1686        struct ieee80211_local *local = sdata->local;
1687        struct ieee802_11_elems *elems = NULL;
1688        struct sta_info *sta;
1689        struct ieee80211_tdls_data *tf = (void *)skb->data;
1690        bool local_initiator;
1691        struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1692        int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1693        struct ieee80211_tdls_ch_sw_params params = {};
1694        int ret;
1695
1696        params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1697        params.timestamp = rx_status->device_timestamp;
1698
1699        if (skb->len < baselen) {
1700                tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1701                         skb->len);
1702                return -EINVAL;
1703        }
1704
1705        mutex_lock(&local->sta_mtx);
1706        sta = sta_info_get(sdata, tf->sa);
1707        if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1708                tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1709                         tf->sa);
1710                ret = -EINVAL;
1711                goto out;
1712        }
1713
1714        params.sta = &sta->sta;
1715        params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1716        if (params.status != 0) {
1717                ret = 0;
1718                goto call_drv;
1719        }
1720
1721        elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1722                                       skb->len - baselen, false, NULL, NULL);
1723        if (!elems) {
1724                ret = -ENOMEM;
1725                goto out;
1726        }
1727
1728        if (elems->parse_error) {
1729                tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1730                ret = -EINVAL;
1731                goto out;
1732        }
1733
1734        if (!elems->ch_sw_timing || !elems->lnk_id) {
1735                tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1736                ret = -EINVAL;
1737                goto out;
1738        }
1739
1740        /* validate the initiator is set correctly */
1741        local_initiator =
1742                !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1743        if (local_initiator == sta->sta.tdls_initiator) {
1744                tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1745                ret = -EINVAL;
1746                goto out;
1747        }
1748
1749        params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1750        params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1751
1752        params.tmpl_skb =
1753                ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1754        if (!params.tmpl_skb) {
1755                ret = -ENOENT;
1756                goto out;
1757        }
1758
1759        ret = 0;
1760call_drv:
1761        drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1762
1763        tdls_dbg(sdata,
1764                 "TDLS channel switch response received from %pM status %d\n",
1765                 tf->sa, params.status);
1766
1767out:
1768        mutex_unlock(&local->sta_mtx);
1769        dev_kfree_skb_any(params.tmpl_skb);
1770        kfree(elems);
1771        return ret;
1772}
1773
1774static int
1775ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1776                                          struct sk_buff *skb)
1777{
1778        struct ieee80211_local *local = sdata->local;
1779        struct ieee802_11_elems *elems;
1780        struct cfg80211_chan_def chandef;
1781        struct ieee80211_channel *chan;
1782        enum nl80211_channel_type chan_type;
1783        int freq;
1784        u8 target_channel, oper_class;
1785        bool local_initiator;
1786        struct sta_info *sta;
1787        enum nl80211_band band;
1788        struct ieee80211_tdls_data *tf = (void *)skb->data;
1789        struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1790        int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1791        struct ieee80211_tdls_ch_sw_params params = {};
1792        int ret = 0;
1793
1794        params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1795        params.timestamp = rx_status->device_timestamp;
1796
1797        if (skb->len < baselen) {
1798                tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1799                         skb->len);
1800                return -EINVAL;
1801        }
1802
1803        target_channel = tf->u.chan_switch_req.target_channel;
1804        oper_class = tf->u.chan_switch_req.oper_class;
1805
1806        /*
1807         * We can't easily infer the channel band. The operating class is
1808         * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1809         * solution here is to treat channels with number >14 as 5GHz ones,
1810         * and specifically check for the (oper_class, channel) combinations
1811         * where this doesn't hold. These are thankfully unique according to
1812         * IEEE802.11-2012.
1813         * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1814         * valid here.
1815         */
1816        if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1817             oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1818             target_channel < 14)
1819                band = NL80211_BAND_5GHZ;
1820        else
1821                band = target_channel < 14 ? NL80211_BAND_2GHZ :
1822                                             NL80211_BAND_5GHZ;
1823
1824        freq = ieee80211_channel_to_frequency(target_channel, band);
1825        if (freq == 0) {
1826                tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1827                         target_channel);
1828                return -EINVAL;
1829        }
1830
1831        chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1832        if (!chan) {
1833                tdls_dbg(sdata,
1834                         "Unsupported channel for TDLS chan switch: %d\n",
1835                         target_channel);
1836                return -EINVAL;
1837        }
1838
1839        elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1840                                       skb->len - baselen, false, NULL, NULL);
1841        if (!elems)
1842                return -ENOMEM;
1843
1844        if (elems->parse_error) {
1845                tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1846                ret = -EINVAL;
1847                goto free;
1848        }
1849
1850        if (!elems->ch_sw_timing || !elems->lnk_id) {
1851                tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1852                ret = -EINVAL;
1853                goto free;
1854        }
1855
1856        if (!elems->sec_chan_offs) {
1857                chan_type = NL80211_CHAN_HT20;
1858        } else {
1859                switch (elems->sec_chan_offs->sec_chan_offs) {
1860                case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1861                        chan_type = NL80211_CHAN_HT40PLUS;
1862                        break;
1863                case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1864                        chan_type = NL80211_CHAN_HT40MINUS;
1865                        break;
1866                default:
1867                        chan_type = NL80211_CHAN_HT20;
1868                        break;
1869                }
1870        }
1871
1872        cfg80211_chandef_create(&chandef, chan, chan_type);
1873
1874        /* we will be active on the TDLS link */
1875        if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1876                                           sdata->wdev.iftype)) {
1877                tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1878                ret = -EINVAL;
1879                goto free;
1880        }
1881
1882        mutex_lock(&local->sta_mtx);
1883        sta = sta_info_get(sdata, tf->sa);
1884        if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1885                tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1886                         tf->sa);
1887                ret = -EINVAL;
1888                goto out;
1889        }
1890
1891        params.sta = &sta->sta;
1892
1893        /* validate the initiator is set correctly */
1894        local_initiator =
1895                !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1896        if (local_initiator == sta->sta.tdls_initiator) {
1897                tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1898                ret = -EINVAL;
1899                goto out;
1900        }
1901
1902        /* peer should have known better */
1903        if (!sta->sta.ht_cap.ht_supported && elems->sec_chan_offs &&
1904            elems->sec_chan_offs->sec_chan_offs) {
1905                tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1906                ret = -ENOTSUPP;
1907                goto out;
1908        }
1909
1910        params.chandef = &chandef;
1911        params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time);
1912        params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout);
1913
1914        params.tmpl_skb =
1915                ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1916                                                   &params.ch_sw_tm_ie);
1917        if (!params.tmpl_skb) {
1918                ret = -ENOENT;
1919                goto out;
1920        }
1921
1922        drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1923
1924        tdls_dbg(sdata,
1925                 "TDLS ch switch request received from %pM ch %d width %d\n",
1926                 tf->sa, params.chandef->chan->center_freq,
1927                 params.chandef->width);
1928out:
1929        mutex_unlock(&local->sta_mtx);
1930        dev_kfree_skb_any(params.tmpl_skb);
1931free:
1932        kfree(elems);
1933        return ret;
1934}
1935
1936void
1937ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1938                                      struct sk_buff *skb)
1939{
1940        struct ieee80211_tdls_data *tf = (void *)skb->data;
1941        struct wiphy *wiphy = sdata->local->hw.wiphy;
1942
1943        lockdep_assert_wiphy(wiphy);
1944
1945        /* make sure the driver supports it */
1946        if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1947                return;
1948
1949        /* we want to access the entire packet */
1950        if (skb_linearize(skb))
1951                return;
1952        /*
1953         * The packet/size was already validated by mac80211 Rx path, only look
1954         * at the action type.
1955         */
1956        switch (tf->action_code) {
1957        case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1958                ieee80211_process_tdls_channel_switch_req(sdata, skb);
1959                break;
1960        case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1961                ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1962                break;
1963        default:
1964                WARN_ON_ONCE(1);
1965                return;
1966        }
1967}
1968
1969void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1970{
1971        struct sta_info *sta;
1972        u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1973
1974        rcu_read_lock();
1975        list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1976                if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1977                    !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1978                        continue;
1979
1980                ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1981                                            NL80211_TDLS_TEARDOWN, reason,
1982                                            GFP_ATOMIC);
1983        }
1984        rcu_read_unlock();
1985}
1986
1987void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
1988                                      const u8 *peer, u16 reason)
1989{
1990        struct ieee80211_sta *sta;
1991
1992        rcu_read_lock();
1993        sta = ieee80211_find_sta(&sdata->vif, peer);
1994        if (!sta || !sta->tdls) {
1995                rcu_read_unlock();
1996                return;
1997        }
1998        rcu_read_unlock();
1999
2000        tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",

2001                 peer, reason,
2002                 ieee80211_get_reason_code_string(reason));
2003
2004        ieee80211_tdls_oper_request(&sdata->vif, peer,
2005                                    NL80211_TDLS_TEARDOWN,
2006                                    WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
2007                                    GFP_ATOMIC);
2008}
2009