LXR linux/net/mac80211/tdls.c

   1/*
   2 * mac80211 TDLS handling code
   3 *
   4 * Copyright 2006-2010  Johannes Berg <johannes@sipsolutions.net>
   5 * Copyright 2014, Intel Corporation
   6 * Copyright 2014  Intel Mobile Communications GmbH
   7 * Copyright 2015 - 2016 Intel Deutschland GmbH
   8 *
   9 * This file is GPLv2 as found in COPYING.
  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
  20/* give usermode some time for retries in setting up the TDLS session */
  21#define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
  22
  23void ieee80211_tdls_peer_del_work(struct work_struct *wk)
  24{
  25        struct ieee80211_sub_if_data *sdata;
  26        struct ieee80211_local *local;
  27
  28        sdata = container_of(wk, struct ieee80211_sub_if_data,
  29                             u.mgd.tdls_peer_del_work.work);
  30        local = sdata->local;
  31
  32        mutex_lock(&local->mtx);
  33        if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
  34                tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
  35                sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
  36                eth_zero_addr(sdata->u.mgd.tdls_peer);
  37        }
  38        mutex_unlock(&local->mtx);
  39}
  40
  41static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
  42                                         struct sk_buff *skb)
  43{
  44        struct ieee80211_local *local = sdata->local;
  45        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  46        bool chan_switch = local->hw.wiphy->features &
  47                           NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
  48        bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
  49                          !ifmgd->tdls_wider_bw_prohibited;
  50        struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
  51        bool vht = sband && sband->vht_cap.vht_supported;
  52        u8 *pos = skb_put(skb, 10);
  53
  54        *pos++ = WLAN_EID_EXT_CAPABILITY;
  55        *pos++ = 8; /* len */
  56        *pos++ = 0x0;
  57        *pos++ = 0x0;
  58        *pos++ = 0x0;
  59        *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
  60        *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
  61        *pos++ = 0;
  62        *pos++ = 0;
  63        *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
  64}
  65
  66static u8
  67ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
  68                           struct sk_buff *skb, u16 start, u16 end,
  69                           u16 spacing)
  70{
  71        u8 subband_cnt = 0, ch_cnt = 0;
  72        struct ieee80211_channel *ch;
  73        struct cfg80211_chan_def chandef;
  74        int i, subband_start;
  75        struct wiphy *wiphy = sdata->local->hw.wiphy;
  76
  77        for (i = start; i <= end; i += spacing) {
  78                if (!ch_cnt)
  79                        subband_start = i;
  80
  81                ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
  82                if (ch) {
  83                        /* we will be active on the channel */
  84                        cfg80211_chandef_create(&chandef, ch,
  85                                                NL80211_CHAN_NO_HT);
  86                        if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
  87                                                          sdata->wdev.iftype)) {
  88                                ch_cnt++;
  89                                /*
  90                                 * check if the next channel is also part of
  91                                 * this allowed range
  92                                 */
  93                                continue;
  94                        }
  95                }
  96
  97                /*
  98                 * we've reached the end of a range, with allowed channels
  99                 * found
 100                 */
 101                if (ch_cnt) {
 102                        u8 *pos = skb_put(skb, 2);
 103                        *pos++ = ieee80211_frequency_to_channel(subband_start);
 104                        *pos++ = ch_cnt;
 105
 106                        subband_cnt++;
 107                        ch_cnt = 0;
 108                }
 109        }
 110
 111        /* all channels in the requested range are allowed - add them here */
 112        if (ch_cnt) {
 113                u8 *pos = skb_put(skb, 2);
 114                *pos++ = ieee80211_frequency_to_channel(subband_start);
 115                *pos++ = ch_cnt;
 116
 117                subband_cnt++;
 118        }
 119
 120        return subband_cnt;
 121}
 122
 123static void
 124ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
 125                                 struct sk_buff *skb)
 126{
 127        /*
 128         * Add possible channels for TDLS. These are channels that are allowed
 129         * to be active.
 130         */
 131        u8 subband_cnt;
 132        u8 *pos = skb_put(skb, 2);
 133
 134        *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 135
 136        /*
 137         * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
 138         * this doesn't happen in real world scenarios.
 139         */
 140
 141        /* 2GHz, with 5MHz spacing */
 142        subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
 143
 144        /* 5GHz, with 20MHz spacing */
 145        subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
 146
 147        /* length */
 148        *pos = 2 * subband_cnt;
 149}
 150
 151static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
 152                                            struct sk_buff *skb)
 153{
 154        u8 *pos;
 155        u8 op_class;
 156
 157        if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
 158                                                  &op_class))
 159                return;
 160
 161        pos = skb_put(skb, 4);
 162        *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
 163        *pos++ = 2; /* len */
 164
 165        *pos++ = op_class;
 166        *pos++ = op_class; /* give current operating class as alternate too */
 167}
 168
 169static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
 170{
 171        u8 *pos = skb_put(skb, 3);
 172
 173        *pos++ = WLAN_EID_BSS_COEX_2040;
 174        *pos++ = 1; /* len */
 175
 176        *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
 177}
 178
 179static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
 180                                        u16 status_code)
 181{
 182        struct ieee80211_supported_band *sband;
 183
 184        /* The capability will be 0 when sending a failure code */
 185        if (status_code != 0)
 186                return 0;
 187
 188        sband = ieee80211_get_sband(sdata);
 189        if (sband && sband->band == NL80211_BAND_2GHZ) {
 190                return WLAN_CAPABILITY_SHORT_SLOT_TIME |
 191                       WLAN_CAPABILITY_SHORT_PREAMBLE;
 192        }
 193
 194        return 0;
 195}
 196
 197static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
 198                                       struct sk_buff *skb, const u8 *peer,
 199                                       bool initiator)
 200{
 201        struct ieee80211_tdls_lnkie *lnkid;
 202        const u8 *init_addr, *rsp_addr;
 203
 204        if (initiator) {
 205                init_addr = sdata->vif.addr;
 206                rsp_addr = peer;
 207        } else {
 208                init_addr = peer;
 209                rsp_addr = sdata->vif.addr;
 210        }
 211
 212        lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
 213
 214        lnkid->ie_type = WLAN_EID_LINK_ID;
 215        lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
 216
 217        memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 218        memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
 219        memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
 220}
 221
 222static void
 223ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 224{
 225        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 226        u8 *pos = skb_put(skb, 4);
 227
 228        *pos++ = WLAN_EID_AID;
 229        *pos++ = 2; /* len */
 230        put_unaligned_le16(ifmgd->aid, pos);
 231}
 232
 233/* translate numbering in the WMM parameter IE to the mac80211 notation */
 234static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
 235{
 236        switch (ac) {
 237        default:
 238                WARN_ON_ONCE(1);
 239        case 0:
 240                return IEEE80211_AC_BE;
 241        case 1:
 242                return IEEE80211_AC_BK;
 243        case 2:
 244                return IEEE80211_AC_VI;
 245        case 3:
 246                return IEEE80211_AC_VO;
 247        }
 248}
 249
 250static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
 251{
 252        u8 ret;
 253
 254        ret = aifsn & 0x0f;
 255        if (acm)
 256                ret |= 0x10;
 257        ret |= (aci << 5) & 0x60;
 258        return ret;
 259}
 260
 261static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
 262{
 263        return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
 264               ((ilog2(cw_max + 1) << 0x4) & 0xf0);
 265}
 266
 267static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
 268                                            struct sk_buff *skb)
 269{
 270        struct ieee80211_wmm_param_ie *wmm;
 271        struct ieee80211_tx_queue_params *txq;
 272        int i;
 273
 274        wmm = skb_put_zero(skb, sizeof(*wmm));
 275
 276        wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
 277        wmm->len = sizeof(*wmm) - 2;
 278
 279        wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
 280        wmm->oui[1] = 0x50;
 281        wmm->oui[2] = 0xf2;
 282        wmm->oui_type = 2; /* WME */
 283        wmm->oui_subtype = 1; /* WME param */
 284        wmm->version = 1; /* WME ver */
 285        wmm->qos_info = 0; /* U-APSD not in use */
 286
 287        /*
 288         * Use the EDCA parameters defined for the BSS, or default if the AP
 289         * doesn't support it, as mandated by 802.11-2012 section 10.22.4
 290         */
 291        for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 292                txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
 293                wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
 294                                                               txq->acm, i);
 295                wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
 296                wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
 297        }
 298}
 299
 300static void
 301ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
 302                                   struct sta_info *sta)
 303{
 304        /* IEEE802.11ac-2013 Table E-4 */
 305        u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
 306        struct cfg80211_chan_def uc = sta->tdls_chandef;
 307        enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
 308        int i;
 309
 310        /* only support upgrading non-narrow channels up to 80Mhz */
 311        if (max_width == NL80211_CHAN_WIDTH_5 ||
 312            max_width == NL80211_CHAN_WIDTH_10)
 313                return;
 314
 315        if (max_width > NL80211_CHAN_WIDTH_80)
 316                max_width = NL80211_CHAN_WIDTH_80;
 317
 318        if (uc.width >= max_width)
 319                return;
 320        /*
 321         * Channel usage constrains in the IEEE802.11ac-2013 specification only
 322         * allow expanding a 20MHz channel to 80MHz in a single way. In
 323         * addition, there are no 40MHz allowed channels that are not part of
 324         * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
 325         */
 326        for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
 327                if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
 328                        uc.center_freq1 = centers_80mhz[i];
 329                        uc.center_freq2 = 0;
 330                        uc.width = NL80211_CHAN_WIDTH_80;
 331                        break;
 332                }
 333
 334        if (!uc.center_freq1)
 335                return;
 336
 337        /* proceed to downgrade the chandef until usable or the same as AP BW */
 338        while (uc.width > max_width ||
 339               (uc.width > sta->tdls_chandef.width &&
 340                !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
 341                                               sdata->wdev.iftype)))
 342                ieee80211_chandef_downgrade(&uc);
 343
 344        if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
 345                tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
 346                         sta->tdls_chandef.width, uc.width);
 347
 348                /*
 349                 * the station is not yet authorized when BW upgrade is done,
 350                 * locking is not required
 351                 */
 352                sta->tdls_chandef = uc;
 353        }
 354}
 355
 356static void
 357ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
 358                                   struct sk_buff *skb, const u8 *peer,
 359                                   u8 action_code, bool initiator,
 360                                   const u8 *extra_ies, size_t extra_ies_len)
 361{
 362        struct ieee80211_supported_band *sband;
 363        struct ieee80211_local *local = sdata->local;
 364        struct ieee80211_sta_ht_cap ht_cap;
 365        struct ieee80211_sta_vht_cap vht_cap;
 366        struct sta_info *sta = NULL;
 367        size_t offset = 0, noffset;
 368        u8 *pos;
 369
 370        sband = ieee80211_get_sband(sdata);
 371        if (!sband)
 372                return;
 373
 374        ieee80211_add_srates_ie(sdata, skb, false, sband->band);
 375        ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
 376        ieee80211_tdls_add_supp_channels(sdata, skb);
 377
 378        /* add any custom IEs that go before Extended Capabilities */
 379        if (extra_ies_len) {
 380                static const u8 before_ext_cap[] = {
 381                        WLAN_EID_SUPP_RATES,
 382                        WLAN_EID_COUNTRY,
 383                        WLAN_EID_EXT_SUPP_RATES,
 384                        WLAN_EID_SUPPORTED_CHANNELS,
 385                        WLAN_EID_RSN,
 386                };
 387                noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 388                                             before_ext_cap,
 389                                             ARRAY_SIZE(before_ext_cap),
 390                                             offset);
 391                skb_put_data(skb, extra_ies + offset, noffset - offset);
 392                offset = noffset;
 393        }
 394
 395        ieee80211_tdls_add_ext_capab(sdata, skb);
 396
 397        /* add the QoS element if we support it */
 398        if (local->hw.queues >= IEEE80211_NUM_ACS &&
 399            action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
 400                ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
 401
 402        /* add any custom IEs that go before HT capabilities */
 403        if (extra_ies_len) {
 404                static const u8 before_ht_cap[] = {
 405                        WLAN_EID_SUPP_RATES,
 406                        WLAN_EID_COUNTRY,
 407                        WLAN_EID_EXT_SUPP_RATES,
 408                        WLAN_EID_SUPPORTED_CHANNELS,
 409                        WLAN_EID_RSN,
 410                        WLAN_EID_EXT_CAPABILITY,
 411                        WLAN_EID_QOS_CAPA,
 412                        WLAN_EID_FAST_BSS_TRANSITION,
 413                        WLAN_EID_TIMEOUT_INTERVAL,
 414                        WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 415                };
 416                noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 417                                             before_ht_cap,
 418                                             ARRAY_SIZE(before_ht_cap),
 419                                             offset);
 420                skb_put_data(skb, extra_ies + offset, noffset - offset);
 421                offset = noffset;
 422        }
 423
 424        mutex_lock(&local->sta_mtx);
 425
 426        /* we should have the peer STA if we're already responding */
 427        if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
 428                sta = sta_info_get(sdata, peer);
 429                if (WARN_ON_ONCE(!sta)) {
 430                        mutex_unlock(&local->sta_mtx);
 431                        return;
 432                }
 433
 434                sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 435        }
 436
 437        ieee80211_tdls_add_oper_classes(sdata, skb);
 438
 439        /*
 440         * with TDLS we can switch channels, and HT-caps are not necessarily
 441         * the same on all bands. The specification limits the setup to a
 442         * single HT-cap, so use the current band for now.
 443         */
 444        memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 445
 446        if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 447             action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 448            ht_cap.ht_supported) {
 449                ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 450
 451                /* disable SMPS in TDLS initiator */
 452                ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
 453                                << IEEE80211_HT_CAP_SM_PS_SHIFT;
 454
 455                pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 456                ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 457        } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 458                   ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 459                /* the peer caps are already intersected with our own */
 460                memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
 461
 462                pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 463                ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
 464        }
 465
 466        if (ht_cap.ht_supported &&
 467            (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 468                ieee80211_tdls_add_bss_coex_ie(skb);
 469
 470        ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 471
 472        /* add any custom IEs that go before VHT capabilities */
 473        if (extra_ies_len) {
 474                static const u8 before_vht_cap[] = {
 475                        WLAN_EID_SUPP_RATES,
 476                        WLAN_EID_COUNTRY,
 477                        WLAN_EID_EXT_SUPP_RATES,
 478                        WLAN_EID_SUPPORTED_CHANNELS,
 479                        WLAN_EID_RSN,
 480                        WLAN_EID_EXT_CAPABILITY,
 481                        WLAN_EID_QOS_CAPA,
 482                        WLAN_EID_FAST_BSS_TRANSITION,
 483                        WLAN_EID_TIMEOUT_INTERVAL,
 484                        WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 485                        WLAN_EID_MULTI_BAND,
 486                };
 487                noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 488                                             before_vht_cap,
 489                                             ARRAY_SIZE(before_vht_cap),
 490                                             offset);
 491                skb_put_data(skb, extra_ies + offset, noffset - offset);
 492                offset = noffset;
 493        }
 494
 495        /* build the VHT-cap similarly to the HT-cap */
 496        memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 497        if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
 498             action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
 499            vht_cap.vht_supported) {
 500                ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 501
 502                /* the AID is present only when VHT is implemented */
 503                if (action_code == WLAN_TDLS_SETUP_REQUEST)
 504                        ieee80211_tdls_add_aid(sdata, skb);
 505
 506                pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 507                ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 508        } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
 509                   vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
 510                /* the peer caps are already intersected with our own */
 511                memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
 512
 513                /* the AID is present only when VHT is implemented */
 514                ieee80211_tdls_add_aid(sdata, skb);
 515
 516                pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 517                ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
 518
 519                /*
 520                 * if both peers support WIDER_BW, we can expand the chandef to
 521                 * a wider compatible one, up to 80MHz
 522                 */
 523                if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 524                        ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 525        }
 526
 527        mutex_unlock(&local->sta_mtx);
 528
 529        /* add any remaining IEs */
 530        if (extra_ies_len) {
 531                noffset = extra_ies_len;
 532                skb_put_data(skb, extra_ies + offset, noffset - offset);
 533        }
 534
 535}
 536
 537static void
 538ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
 539                                 struct sk_buff *skb, const u8 *peer,
 540                                 bool initiator, const u8 *extra_ies,
 541                                 size_t extra_ies_len)
 542{
 543        struct ieee80211_local *local = sdata->local;
 544        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 545        size_t offset = 0, noffset;
 546        struct sta_info *sta, *ap_sta;
 547        struct ieee80211_supported_band *sband;
 548        u8 *pos;
 549
 550        sband = ieee80211_get_sband(sdata);
 551        if (!sband)
 552                return;
 553
 554        mutex_lock(&local->sta_mtx);
 555
 556        sta = sta_info_get(sdata, peer);
 557        ap_sta = sta_info_get(sdata, ifmgd->bssid);
 558        if (WARN_ON_ONCE(!sta || !ap_sta)) {
 559                mutex_unlock(&local->sta_mtx);
 560                return;
 561        }
 562
 563        sta->tdls_chandef = sdata->vif.bss_conf.chandef;
 564
 565        /* add any custom IEs that go before the QoS IE */
 566        if (extra_ies_len) {
 567                static const u8 before_qos[] = {
 568                        WLAN_EID_RSN,
 569                };
 570                noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 571                                             before_qos,
 572                                             ARRAY_SIZE(before_qos),
 573                                             offset);
 574                skb_put_data(skb, extra_ies + offset, noffset - offset);
 575                offset = noffset;
 576        }
 577
 578        /* add the QoS param IE if both the peer and we support it */
 579        if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 580                ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 581
 582        /* add any custom IEs that go before HT operation */
 583        if (extra_ies_len) {
 584                static const u8 before_ht_op[] = {
 585                        WLAN_EID_RSN,
 586                        WLAN_EID_QOS_CAPA,
 587                        WLAN_EID_FAST_BSS_TRANSITION,
 588                        WLAN_EID_TIMEOUT_INTERVAL,
 589                };
 590                noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 591                                             before_ht_op,
 592                                             ARRAY_SIZE(before_ht_op),
 593                                             offset);
 594                skb_put_data(skb, extra_ies + offset, noffset - offset);
 595                offset = noffset;
 596        }
 597
 598        /*
 599         * if HT support is only added in TDLS, we need an HT-operation IE.
 600         * add the IE as required by IEEE802.11-2012 9.23.3.2.
 601         */
 602        if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
 603                u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
 604                           IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
 605                           IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
 606
 607                pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 608                ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
 609                                           &sdata->vif.bss_conf.chandef, prot,
 610                                           true);
 611        }
 612
 613        ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 614
 615        /* only include VHT-operation if not on the 2.4GHz band */
 616        if (sband->band != NL80211_BAND_2GHZ &&
 617            sta->sta.vht_cap.vht_supported) {
 618                /*
 619                 * if both peers support WIDER_BW, we can expand the chandef to
 620                 * a wider compatible one, up to 80MHz
 621                 */
 622                if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 623                        ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
 624
 625                pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 626                ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
 627                                            &sta->tdls_chandef);
 628        }
 629
 630        mutex_unlock(&local->sta_mtx);
 631
 632        /* add any remaining IEs */
 633        if (extra_ies_len) {
 634                noffset = extra_ies_len;
 635                skb_put_data(skb, extra_ies + offset, noffset - offset);
 636        }
 637}
 638
 639static void
 640ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
 641                                       struct sk_buff *skb, const u8 *peer,
 642                                       bool initiator, const u8 *extra_ies,
 643                                       size_t extra_ies_len, u8 oper_class,
 644                                       struct cfg80211_chan_def *chandef)
 645{
 646        struct ieee80211_tdls_data *tf;
 647        size_t offset = 0, noffset;
 648
 649        if (WARN_ON_ONCE(!chandef))
 650                return;
 651
 652        tf = (void *)skb->data;
 653        tf->u.chan_switch_req.target_channel =
 654                ieee80211_frequency_to_channel(chandef->chan->center_freq);
 655        tf->u.chan_switch_req.oper_class = oper_class;
 656
 657        if (extra_ies_len) {
 658                static const u8 before_lnkie[] = {
 659                        WLAN_EID_SECONDARY_CHANNEL_OFFSET,
 660                };
 661                noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
 662                                             before_lnkie,
 663                                             ARRAY_SIZE(before_lnkie),
 664                                             offset);
 665                skb_put_data(skb, extra_ies + offset, noffset - offset);
 666                offset = noffset;
 667        }
 668
 669        ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 670
 671        /* add any remaining IEs */
 672        if (extra_ies_len) {
 673                noffset = extra_ies_len;
 674                skb_put_data(skb, extra_ies + offset, noffset - offset);
 675        }
 676}
 677
 678static void
 679ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
 680                                        struct sk_buff *skb, const u8 *peer,
 681                                        u16 status_code, bool initiator,
 682                                        const u8 *extra_ies,
 683                                        size_t extra_ies_len)
 684{
 685        if (status_code == 0)
 686                ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 687
 688        if (extra_ies_len)
 689                skb_put_data(skb, extra_ies, extra_ies_len);
 690}
 691
 692static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
 693                                   struct sk_buff *skb, const u8 *peer,
 694                                   u8 action_code, u16 status_code,
 695                                   bool initiator, const u8 *extra_ies,
 696                                   size_t extra_ies_len, u8 oper_class,
 697                                   struct cfg80211_chan_def *chandef)
 698{
 699        switch (action_code) {
 700        case WLAN_TDLS_SETUP_REQUEST:
 701        case WLAN_TDLS_SETUP_RESPONSE:
 702        case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 703                if (status_code == 0)
 704                        ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
 705                                                           action_code,
 706                                                           initiator,
 707                                                           extra_ies,
 708                                                           extra_ies_len);
 709                break;
 710        case WLAN_TDLS_SETUP_CONFIRM:
 711                if (status_code == 0)
 712                        ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
 713                                                         initiator, extra_ies,
 714                                                         extra_ies_len);
 715                break;
 716        case WLAN_TDLS_TEARDOWN:
 717        case WLAN_TDLS_DISCOVERY_REQUEST:
 718                if (extra_ies_len)
 719                        skb_put_data(skb, extra_ies, extra_ies_len);
 720                if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
 721                        ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
 722                break;
 723        case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 724                ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
 725                                                       initiator, extra_ies,
 726                                                       extra_ies_len,
 727                                                       oper_class, chandef);
 728                break;
 729        case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 730                ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
 731                                                        status_code,
 732                                                        initiator, extra_ies,
 733                                                        extra_ies_len);
 734                break;
 735        }
 736
 737}
 738
 739static int
 740ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
 741                               const u8 *peer, u8 action_code, u8 dialog_token,
 742                               u16 status_code, struct sk_buff *skb)
 743{
 744        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 745        struct ieee80211_tdls_data *tf;
 746
 747        tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
 748
 749        memcpy(tf->da, peer, ETH_ALEN);
 750        memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
 751        tf->ether_type = cpu_to_be16(ETH_P_TDLS);
 752        tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
 753
 754        /* network header is after the ethernet header */
 755        skb_set_network_header(skb, ETH_HLEN);
 756
 757        switch (action_code) {
 758        case WLAN_TDLS_SETUP_REQUEST:
 759                tf->category = WLAN_CATEGORY_TDLS;
 760                tf->action_code = WLAN_TDLS_SETUP_REQUEST;
 761
 762                skb_put(skb, sizeof(tf->u.setup_req));
 763                tf->u.setup_req.dialog_token = dialog_token;
 764                tf->u.setup_req.capability =
 765                        cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 766                                                                 status_code));
 767                break;
 768        case WLAN_TDLS_SETUP_RESPONSE:
 769                tf->category = WLAN_CATEGORY_TDLS;
 770                tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
 771
 772                skb_put(skb, sizeof(tf->u.setup_resp));
 773                tf->u.setup_resp.status_code = cpu_to_le16(status_code);
 774                tf->u.setup_resp.dialog_token = dialog_token;
 775                tf->u.setup_resp.capability =
 776                        cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 777                                                                 status_code));
 778                break;
 779        case WLAN_TDLS_SETUP_CONFIRM:
 780                tf->category = WLAN_CATEGORY_TDLS;
 781                tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
 782
 783                skb_put(skb, sizeof(tf->u.setup_cfm));
 784                tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
 785                tf->u.setup_cfm.dialog_token = dialog_token;
 786                break;
 787        case WLAN_TDLS_TEARDOWN:
 788                tf->category = WLAN_CATEGORY_TDLS;
 789                tf->action_code = WLAN_TDLS_TEARDOWN;
 790
 791                skb_put(skb, sizeof(tf->u.teardown));
 792                tf->u.teardown.reason_code = cpu_to_le16(status_code);
 793                break;
 794        case WLAN_TDLS_DISCOVERY_REQUEST:
 795                tf->category = WLAN_CATEGORY_TDLS;
 796                tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
 797
 798                skb_put(skb, sizeof(tf->u.discover_req));
 799                tf->u.discover_req.dialog_token = dialog_token;
 800                break;
 801        case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 802                tf->category = WLAN_CATEGORY_TDLS;
 803                tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
 804
 805                skb_put(skb, sizeof(tf->u.chan_switch_req));
 806                break;
 807        case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 808                tf->category = WLAN_CATEGORY_TDLS;
 809                tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
 810
 811                skb_put(skb, sizeof(tf->u.chan_switch_resp));
 812                tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
 813                break;
 814        default:
 815                return -EINVAL;
 816        }
 817
 818        return 0;
 819}
 820
 821static int
 822ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
 823                           const u8 *peer, u8 action_code, u8 dialog_token,
 824                           u16 status_code, struct sk_buff *skb)
 825{
 826        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 827        struct ieee80211_mgmt *mgmt;
 828
 829        mgmt = skb_put_zero(skb, 24);
 830        memcpy(mgmt->da, peer, ETH_ALEN);
 831        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 832        memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 833
 834        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 835                                          IEEE80211_STYPE_ACTION);
 836
 837        switch (action_code) {
 838        case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 839                skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
 840                mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
 841                mgmt->u.action.u.tdls_discover_resp.action_code =
 842                        WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
 843                mgmt->u.action.u.tdls_discover_resp.dialog_token =
 844                        dialog_token;
 845                mgmt->u.action.u.tdls_discover_resp.capability =
 846                        cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
 847                                                                 status_code));
 848                break;
 849        default:
 850                return -EINVAL;
 851        }
 852
 853        return 0;
 854}
 855
 856static struct sk_buff *
 857ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
 858                                      const u8 *peer, u8 action_code,
 859                                      u8 dialog_token, u16 status_code,
 860                                      bool initiator, const u8 *extra_ies,
 861                                      size_t extra_ies_len, u8 oper_class,
 862                                      struct cfg80211_chan_def *chandef)
 863{
 864        struct ieee80211_local *local = sdata->local;
 865        struct sk_buff *skb;
 866        int ret;
 867
 868        skb = netdev_alloc_skb(sdata->dev,
 869                               local->hw.extra_tx_headroom +
 870                               max(sizeof(struct ieee80211_mgmt),
 871                                   sizeof(struct ieee80211_tdls_data)) +
 872                               50 + /* supported rates */
 873                               10 + /* ext capab */
 874                               26 + /* max(WMM-info, WMM-param) */
 875                               2 + max(sizeof(struct ieee80211_ht_cap),
 876                                       sizeof(struct ieee80211_ht_operation)) +
 877                               2 + max(sizeof(struct ieee80211_vht_cap),
 878                                       sizeof(struct ieee80211_vht_operation)) +
 879                               50 + /* supported channels */
 880                               3 + /* 40/20 BSS coex */
 881                               4 + /* AID */
 882                               4 + /* oper classes */
 883                               extra_ies_len +
 884                               sizeof(struct ieee80211_tdls_lnkie));
 885        if (!skb)
 886                return NULL;
 887
 888        skb_reserve(skb, local->hw.extra_tx_headroom);
 889
 890        switch (action_code) {
 891        case WLAN_TDLS_SETUP_REQUEST:
 892        case WLAN_TDLS_SETUP_RESPONSE:
 893        case WLAN_TDLS_SETUP_CONFIRM:
 894        case WLAN_TDLS_TEARDOWN:
 895        case WLAN_TDLS_DISCOVERY_REQUEST:
 896        case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 897        case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 898                ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
 899                                                     sdata->dev, peer,
 900                                                     action_code, dialog_token,
 901                                                     status_code, skb);
 902                break;
 903        case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 904                ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
 905                                                 peer, action_code,
 906                                                 dialog_token, status_code,
 907                                                 skb);
 908                break;
 909        default:
 910                ret = -ENOTSUPP;
 911                break;
 912        }
 913
 914        if (ret < 0)
 915                goto fail;
 916
 917        ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
 918                               initiator, extra_ies, extra_ies_len, oper_class,
 919                               chandef);
 920        return skb;
 921
 922fail:
 923        dev_kfree_skb(skb);
 924        return NULL;
 925}
 926
 927static int
 928ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
 929                                const u8 *peer, u8 action_code, u8 dialog_token,
 930                                u16 status_code, u32 peer_capability,
 931                                bool initiator, const u8 *extra_ies,
 932                                size_t extra_ies_len, u8 oper_class,
 933                                struct cfg80211_chan_def *chandef)
 934{
 935        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 936        struct sk_buff *skb = NULL;
 937        struct sta_info *sta;
 938        u32 flags = 0;
 939        int ret = 0;
 940
 941        rcu_read_lock();
 942        sta = sta_info_get(sdata, peer);
 943
 944        /* infer the initiator if we can, to support old userspace */
 945        switch (action_code) {
 946        case WLAN_TDLS_SETUP_REQUEST:
 947                if (sta) {
 948                        set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 949                        sta->sta.tdls_initiator = false;
 950                }
 951                /* fall-through */
 952        case WLAN_TDLS_SETUP_CONFIRM:
 953        case WLAN_TDLS_DISCOVERY_REQUEST:
 954                initiator = true;
 955                break;
 956        case WLAN_TDLS_SETUP_RESPONSE:
 957                /*
 958                 * In some testing scenarios, we send a request and response.
 959                 * Make the last packet sent take effect for the initiator
 960                 * value.
 961                 */
 962                if (sta) {
 963                        clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
 964                        sta->sta.tdls_initiator = true;
 965                }
 966                /* fall-through */
 967        case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
 968                initiator = false;
 969                break;
 970        case WLAN_TDLS_TEARDOWN:
 971        case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
 972        case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
 973                /* any value is ok */
 974                break;
 975        default:
 976                ret = -ENOTSUPP;
 977                break;
 978        }
 979
 980        if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
 981                initiator = true;
 982
 983        rcu_read_unlock();
 984        if (ret < 0)
 985                goto fail;
 986
 987        skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
 988                                                    dialog_token, status_code,
 989                                                    initiator, extra_ies,
 990                                                    extra_ies_len, oper_class,
 991                                                    chandef);
 992        if (!skb) {
 993                ret = -EINVAL;
 994                goto fail;
 995        }
 996
 997        if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
 998                ieee80211_tx_skb(sdata, skb);
 999                return 0;
1000        }

1001
1002        /*
1003         * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1004         * we should default to AC_VI.
1005         */
1006        switch (action_code) {
1007        case WLAN_TDLS_SETUP_REQUEST:
1008        case WLAN_TDLS_SETUP_RESPONSE:
1009                skb_set_queue_mapping(skb, IEEE80211_AC_BK);
1010                skb->priority = 2;
1011                break;
1012        default:
1013                skb_set_queue_mapping(skb, IEEE80211_AC_VI);
1014                skb->priority = 5;
1015                break;
1016        }
1017
1018        /*
1019         * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1020         * Later, if no ACK is returned from peer, we will re-send the teardown
1021         * packet through the AP.
1022         */
1023        if ((action_code == WLAN_TDLS_TEARDOWN) &&
1024            ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1025                bool try_resend; /* Should we keep skb for possible resend */
1026
1027                /* If not sending directly to peer - no point in keeping skb */
1028                rcu_read_lock();
1029                sta = sta_info_get(sdata, peer);
1030                try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1031                rcu_read_unlock();
1032
1033                spin_lock_bh(&sdata->u.mgd.teardown_lock);
1034                if (try_resend && !sdata->u.mgd.teardown_skb) {
1035                        /* Mark it as requiring TX status callback  */
1036                        flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1037                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
1038
1039                        /*
1040                         * skb is copied since mac80211 will later set
1041                         * properties that might not be the same as the AP,
1042                         * such as encryption, QoS, addresses, etc.
1043                         *
1044                         * No problem if skb_copy() fails, so no need to check.
1045                         */
1046                        sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1047                        sdata->u.mgd.orig_teardown_skb = skb;
1048                }
1049                spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1050        }
1051
1052        /* disable bottom halves when entering the Tx path */
1053        local_bh_disable();
1054        __ieee80211_subif_start_xmit(skb, dev, flags);
1055        local_bh_enable();
1056
1057        return ret;
1058
1059fail:
1060        dev_kfree_skb(skb);
1061        return ret;
1062}
1063
1064static int
1065ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1066                          const u8 *peer, u8 action_code, u8 dialog_token,
1067                          u16 status_code, u32 peer_capability, bool initiator,
1068                          const u8 *extra_ies, size_t extra_ies_len)
1069{
1070        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1071        struct ieee80211_local *local = sdata->local;
1072        enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1073        int ret;
1074
1075        /* don't support setup with forced SMPS mode that's not off */
1076        if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1077            smps_mode != IEEE80211_SMPS_OFF) {
1078                tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1079                         smps_mode);
1080                return -ENOTSUPP;
1081        }
1082
1083        mutex_lock(&local->mtx);
1084
1085        /* we don't support concurrent TDLS peer setups */
1086        if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1087            !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1088                ret = -EBUSY;
1089                goto out_unlock;
1090        }
1091
1092        /*
1093         * make sure we have a STA representing the peer so we drop or buffer
1094         * non-TDLS-setup frames to the peer. We can't send other packets
1095         * during setup through the AP path.
1096         * Allow error packets to be sent - sometimes we don't even add a STA
1097         * before failing the setup.
1098         */
1099        if (status_code == 0) {
1100                rcu_read_lock();
1101                if (!sta_info_get(sdata, peer)) {
1102                        rcu_read_unlock();
1103                        ret = -ENOLINK;
1104                        goto out_unlock;
1105                }
1106                rcu_read_unlock();
1107        }
1108
1109        ieee80211_flush_queues(local, sdata, false);
1110        memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1111        mutex_unlock(&local->mtx);
1112
1113        /* we cannot take the mutex while preparing the setup packet */
1114        ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1115                                              dialog_token, status_code,
1116                                              peer_capability, initiator,
1117                                              extra_ies, extra_ies_len, 0,
1118                                              NULL);
1119        if (ret < 0) {
1120                mutex_lock(&local->mtx);
1121                eth_zero_addr(sdata->u.mgd.tdls_peer);
1122                mutex_unlock(&local->mtx);
1123                return ret;
1124        }
1125
1126        ieee80211_queue_delayed_work(&sdata->local->hw,
1127                                     &sdata->u.mgd.tdls_peer_del_work,
1128                                     TDLS_PEER_SETUP_TIMEOUT);
1129        return 0;
1130
1131out_unlock:
1132        mutex_unlock(&local->mtx);
1133        return ret;
1134}
1135
1136static int
1137ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1138                             const u8 *peer, u8 action_code, u8 dialog_token,
1139                             u16 status_code, u32 peer_capability,
1140                             bool initiator, const u8 *extra_ies,
1141                             size_t extra_ies_len)
1142{
1143        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1144        struct ieee80211_local *local = sdata->local;
1145        struct sta_info *sta;
1146        int ret;
1147
1148        /*
1149         * No packets can be transmitted to the peer via the AP during setup -
1150         * the STA is set as a TDLS peer, but is not authorized.
1151         * During teardown, we prevent direct transmissions by stopping the
1152         * queues and flushing all direct packets.
1153         */
1154        ieee80211_stop_vif_queues(local, sdata,
1155                                  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1156        ieee80211_flush_queues(local, sdata, false);
1157
1158        ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1159                                              dialog_token, status_code,
1160                                              peer_capability, initiator,
1161                                              extra_ies, extra_ies_len, 0,
1162                                              NULL);
1163        if (ret < 0)
1164                sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1165                          ret);
1166
1167        /*
1168         * Remove the STA AUTH flag to force further traffic through the AP. If
1169         * the STA was unreachable, it was already removed.
1170         */
1171        rcu_read_lock();
1172        sta = sta_info_get(sdata, peer);
1173        if (sta)
1174                clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1175        rcu_read_unlock();
1176
1177        ieee80211_wake_vif_queues(local, sdata,
1178                                  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1179
1180        return 0;
1181}
1182
1183int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1184                        const u8 *peer, u8 action_code, u8 dialog_token,
1185                        u16 status_code, u32 peer_capability,
1186                        bool initiator, const u8 *extra_ies,
1187                        size_t extra_ies_len)
1188{
1189        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1190        int ret;
1191
1192        if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1193                return -ENOTSUPP;
1194
1195        /* make sure we are in managed mode, and associated */
1196        if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1197            !sdata->u.mgd.associated)
1198                return -EINVAL;
1199
1200        switch (action_code) {
1201        case WLAN_TDLS_SETUP_REQUEST:
1202        case WLAN_TDLS_SETUP_RESPONSE:
1203                ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1204                                                dialog_token, status_code,
1205                                                peer_capability, initiator,
1206                                                extra_ies, extra_ies_len);
1207                break;
1208        case WLAN_TDLS_TEARDOWN:
1209                ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1210                                                   action_code, dialog_token,
1211                                                   status_code,
1212                                                   peer_capability, initiator,
1213                                                   extra_ies, extra_ies_len);
1214                break;
1215        case WLAN_TDLS_DISCOVERY_REQUEST:
1216                /*
1217                 * Protect the discovery so we can hear the TDLS discovery
1218                 * response frame. It is transmitted directly and not buffered
1219                 * by the AP.
1220                 */
1221                drv_mgd_protect_tdls_discover(sdata->local, sdata);
1222                /* fall-through */
1223        case WLAN_TDLS_SETUP_CONFIRM:
1224        case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1225                /* no special handling */
1226                ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1227                                                      action_code,
1228                                                      dialog_token,
1229                                                      status_code,
1230                                                      peer_capability,
1231                                                      initiator, extra_ies,
1232                                                      extra_ies_len, 0, NULL);
1233                break;
1234        default:
1235                ret = -EOPNOTSUPP;
1236                break;
1237        }
1238
1239        tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1240                 action_code, peer, ret);
1241        return ret;
1242}
1243
1244static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1245                                         struct sta_info *sta)
1246{
1247        struct ieee80211_local *local = sdata->local;
1248        struct ieee80211_chanctx_conf *conf;
1249        struct ieee80211_chanctx *ctx;
1250        enum nl80211_chan_width width;
1251        struct ieee80211_supported_band *sband;
1252
1253        mutex_lock(&local->chanctx_mtx);
1254        conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1255                                         lockdep_is_held(&local->chanctx_mtx));
1256        if (conf) {
1257                width = conf->def.width;
1258                sband = local->hw.wiphy->bands[conf->def.chan->band];
1259                ctx = container_of(conf, struct ieee80211_chanctx, conf);
1260                ieee80211_recalc_chanctx_chantype(local, ctx);
1261
1262                /* if width changed and a peer is given, update its BW */
1263                if (width != conf->def.width && sta &&
1264                    test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1265                        enum ieee80211_sta_rx_bandwidth bw;
1266
1267                        bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1268                        bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1269                        if (bw != sta->sta.bandwidth) {
1270                                sta->sta.bandwidth = bw;
1271                                rate_control_rate_update(local, sband, sta,
1272                                                         IEEE80211_RC_BW_CHANGED);
1273                                /*
1274                                 * if a TDLS peer BW was updated, we need to
1275                                 * recalc the chandef width again, to get the
1276                                 * correct chanctx min_def
1277                                 */
1278                                ieee80211_recalc_chanctx_chantype(local, ctx);
1279                        }
1280                }
1281
1282        }
1283        mutex_unlock(&local->chanctx_mtx);
1284}
1285
1286static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1287{
1288        struct sta_info *sta;
1289        bool result = false;
1290
1291        rcu_read_lock();
1292        list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1293                if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1294                    !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1295                    !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1296                    !sta->sta.ht_cap.ht_supported)
1297                        continue;
1298                result = true;
1299                break;
1300        }
1301        rcu_read_unlock();
1302
1303        return result;
1304}
1305
1306static void
1307iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1308                                   struct sta_info *sta)
1309{
1310        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1311        bool tdls_ht;
1312        u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1313                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1314                         IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1315        u16 opmode;
1316
1317        /* Nothing to do if the BSS connection uses HT */
1318        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1319                return;
1320
1321        tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1322                  iee80211_tdls_have_ht_peers(sdata);
1323
1324        opmode = sdata->vif.bss_conf.ht_operation_mode;
1325
1326        if (tdls_ht)
1327                opmode |= protection;
1328        else
1329                opmode &= ~protection;
1330
1331        if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1332                return;
1333
1334        sdata->vif.bss_conf.ht_operation_mode = opmode;
1335        ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1336}
1337
1338int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1339                        const u8 *peer, enum nl80211_tdls_operation oper)
1340{
1341        struct sta_info *sta;
1342        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1343        struct ieee80211_local *local = sdata->local;
1344        int ret;
1345
1346        if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1347                return -ENOTSUPP;
1348
1349        if (sdata->vif.type != NL80211_IFTYPE_STATION)
1350                return -EINVAL;
1351
1352        switch (oper) {
1353        case NL80211_TDLS_ENABLE_LINK:
1354        case NL80211_TDLS_DISABLE_LINK:
1355                break;
1356        case NL80211_TDLS_TEARDOWN:
1357        case NL80211_TDLS_SETUP:
1358        case NL80211_TDLS_DISCOVERY_REQ:
1359                /* We don't support in-driver setup/teardown/discovery */
1360                return -ENOTSUPP;
1361        }
1362
1363        /* protect possible bss_conf changes and avoid concurrency in
1364         * ieee80211_bss_info_change_notify()
1365         */
1366        sdata_lock(sdata);
1367        mutex_lock(&local->mtx);
1368        tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1369
1370        switch (oper) {
1371        case NL80211_TDLS_ENABLE_LINK:
1372                if (sdata->vif.csa_active) {
1373                        tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1374                        ret = -EBUSY;
1375                        break;
1376                }
1377
1378                mutex_lock(&local->sta_mtx);
1379                sta = sta_info_get(sdata, peer);
1380                if (!sta) {
1381                        mutex_unlock(&local->sta_mtx);
1382                        ret = -ENOLINK;
1383                        break;
1384                }
1385
1386                iee80211_tdls_recalc_chanctx(sdata, sta);
1387                iee80211_tdls_recalc_ht_protection(sdata, sta);
1388
1389                set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1390                mutex_unlock(&local->sta_mtx);
1391
1392                WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1393                             !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1394                ret = 0;
1395                break;
1396        case NL80211_TDLS_DISABLE_LINK:
1397                /*
1398                 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1399                 * created while the queues were stopped, so it might still be
1400                 * pending. Before flushing the queues we need to be sure the
1401                 * message is handled by the tasklet handling pending messages,
1402                 * otherwise we might start destroying the station before
1403                 * sending the teardown packet.
1404                 * Note that this only forces the tasklet to flush pendings -
1405                 * not to stop the tasklet from rescheduling itself.
1406                 */
1407                tasklet_kill(&local->tx_pending_tasklet);
1408                /* flush a potentially queued teardown packet */
1409                ieee80211_flush_queues(local, sdata, false);
1410
1411                ret = sta_info_destroy_addr(sdata, peer);
1412
1413                mutex_lock(&local->sta_mtx);
1414                iee80211_tdls_recalc_ht_protection(sdata, NULL);
1415                mutex_unlock(&local->sta_mtx);
1416
1417                iee80211_tdls_recalc_chanctx(sdata, NULL);
1418                break;
1419        default:
1420                ret = -ENOTSUPP;
1421                break;
1422        }
1423
1424        if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1425                cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1426                eth_zero_addr(sdata->u.mgd.tdls_peer);
1427        }
1428
1429        if (ret == 0)
1430                ieee80211_queue_work(&sdata->local->hw,
1431                                     &sdata->u.mgd.request_smps_work);
1432
1433        mutex_unlock(&local->mtx);
1434        sdata_unlock(sdata);
1435        return ret;
1436}
1437
1438void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1439                                 enum nl80211_tdls_operation oper,
1440                                 u16 reason_code, gfp_t gfp)
1441{
1442        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1443
1444        if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1445                sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1446                          oper);
1447                return;
1448        }
1449
1450        cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1451}
1452EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1453
1454static void
1455iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1456{
1457        struct ieee80211_ch_switch_timing *ch_sw;
1458
1459        *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1460        *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1461
1462        ch_sw = (void *)buf;
1463        ch_sw->switch_time = cpu_to_le16(switch_time);
1464        ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1465}
1466
1467/* find switch timing IE in SKB ready for Tx */
1468static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1469{
1470        struct ieee80211_tdls_data *tf;
1471        const u8 *ie_start;
1472
1473        /*
1474         * Get the offset for the new location of the switch timing IE.
1475         * The SKB network header will now point to the "payload_type"
1476         * element of the TDLS data frame struct.
1477         */
1478        tf = container_of(skb->data + skb_network_offset(skb),
1479                          struct ieee80211_tdls_data, payload_type);
1480        ie_start = tf->u.chan_switch_req.variable;
1481        return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1482                                skb->len - (ie_start - skb->data));
1483}
1484
1485static struct sk_buff *
1486ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1487                              struct cfg80211_chan_def *chandef,
1488                              u32 *ch_sw_tm_ie_offset)
1489{
1490        struct ieee80211_sub_if_data *sdata = sta->sdata;
1491        u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1492                     2 + sizeof(struct ieee80211_ch_switch_timing)];
1493        int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1494        u8 *pos = extra_ies;
1495        struct sk_buff *skb;
1496
1497        /*
1498         * if chandef points to a wide channel add a Secondary-Channel
1499         * Offset information element
1500         */
1501        if (chandef->width == NL80211_CHAN_WIDTH_40) {
1502                struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1503                bool ht40plus;
1504
1505                *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1506                *pos++ = sizeof(*sec_chan_ie);
1507                sec_chan_ie = (void *)pos;
1508
1509                ht40plus = cfg80211_get_chandef_type(chandef) ==
1510                                                        NL80211_CHAN_HT40PLUS;
1511                sec_chan_ie->sec_chan_offs = ht40plus ?
1512                                             IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1513                                             IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1514                pos += sizeof(*sec_chan_ie);
1515
1516                extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1517        }
1518
1519        /* just set the values to 0, this is a template */
1520        iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1521
1522        skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1523                                              WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1524                                              0, 0, !sta->sta.tdls_initiator,
1525                                              extra_ies, extra_ies_len,
1526                                              oper_class, chandef);
1527        if (!skb)
1528                return NULL;
1529
1530        skb = ieee80211_build_data_template(sdata, skb, 0);
1531        if (IS_ERR(skb)) {
1532                tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1533                return NULL;
1534        }
1535
1536        if (ch_sw_tm_ie_offset) {
1537                const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1538
1539                if (!tm_ie) {
1540                        tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1541                        dev_kfree_skb_any(skb);
1542                        return NULL;
1543                }
1544
1545                *ch_sw_tm_ie_offset = tm_ie - skb->data;
1546        }
1547
1548        tdls_dbg(sdata,
1549                 "TDLS channel switch request template for %pM ch %d width %d\n",
1550                 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1551        return skb;
1552}
1553
1554int
1555ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1556                              const u8 *addr, u8 oper_class,
1557                              struct cfg80211_chan_def *chandef)
1558{
1559        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1560        struct ieee80211_local *local = sdata->local;
1561        struct sta_info *sta;
1562        struct sk_buff *skb = NULL;
1563        u32 ch_sw_tm_ie;
1564        int ret;
1565
1566        mutex_lock(&local->sta_mtx);
1567        sta = sta_info_get(sdata, addr);
1568        if (!sta) {
1569                tdls_dbg(sdata,
1570                         "Invalid TDLS peer %pM for channel switch request\n",
1571                         addr);
1572                ret = -ENOENT;
1573                goto out;
1574        }
1575
1576        if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1577                tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1578                         addr);
1579                ret = -ENOTSUPP;
1580                goto out;
1581        }
1582
1583        skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1584                                            &ch_sw_tm_ie);
1585        if (!skb) {
1586                ret = -ENOENT;
1587                goto out;
1588        }
1589
1590        ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1591                                      chandef, skb, ch_sw_tm_ie);
1592        if (!ret)
1593                set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1594
1595out:
1596        mutex_unlock(&local->sta_mtx);
1597        dev_kfree_skb_any(skb);
1598        return ret;
1599}
1600
1601void
1602ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1603                                     struct net_device *dev,
1604                                     const u8 *addr)
1605{
1606        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1607        struct ieee80211_local *local = sdata->local;
1608        struct sta_info *sta;
1609
1610        mutex_lock(&local->sta_mtx);
1611        sta = sta_info_get(sdata, addr);
1612        if (!sta) {
1613                tdls_dbg(sdata,
1614                         "Invalid TDLS peer %pM for channel switch cancel\n",
1615                         addr);
1616                goto out;
1617        }
1618
1619        if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1620                tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1621                         addr);
1622                goto out;
1623        }
1624
1625        drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1626        clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1627
1628out:
1629        mutex_unlock(&local->sta_mtx);
1630}
1631
1632static struct sk_buff *
1633ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1634                                   u32 *ch_sw_tm_ie_offset)
1635{
1636        struct ieee80211_sub_if_data *sdata = sta->sdata;
1637        struct sk_buff *skb;
1638        u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1639
1640        /* initial timing are always zero in the template */
1641        iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1642
1643        skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1644                                        WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1645                                        0, 0, !sta->sta.tdls_initiator,
1646                                        extra_ies, sizeof(extra_ies), 0, NULL);
1647        if (!skb)
1648                return NULL;
1649
1650        skb = ieee80211_build_data_template(sdata, skb, 0);
1651        if (IS_ERR(skb)) {
1652                tdls_dbg(sdata,
1653                         "Failed building TDLS channel switch resp frame\n");
1654                return NULL;
1655        }
1656
1657        if (ch_sw_tm_ie_offset) {
1658                const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1659
1660                if (!tm_ie) {
1661                        tdls_dbg(sdata,
1662                                 "No switch timing IE in TDLS switch resp\n");
1663                        dev_kfree_skb_any(skb);
1664                        return NULL;
1665                }
1666
1667                *ch_sw_tm_ie_offset = tm_ie - skb->data;
1668        }
1669
1670        tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1671                 sta->sta.addr);
1672        return skb;
1673}
1674
1675static int
1676ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1677                                           struct sk_buff *skb)
1678{
1679        struct ieee80211_local *local = sdata->local;
1680        struct ieee802_11_elems elems;
1681        struct sta_info *sta;
1682        struct ieee80211_tdls_data *tf = (void *)skb->data;
1683        bool local_initiator;
1684        struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1685        int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1686        struct ieee80211_tdls_ch_sw_params params = {};
1687        int ret;
1688
1689        params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1690        params.timestamp = rx_status->device_timestamp;
1691
1692        if (skb->len < baselen) {
1693                tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1694                         skb->len);
1695                return -EINVAL;
1696        }
1697
1698        mutex_lock(&local->sta_mtx);
1699        sta = sta_info_get(sdata, tf->sa);
1700        if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1701                tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1702                         tf->sa);
1703                ret = -EINVAL;
1704                goto out;
1705        }
1706
1707        params.sta = &sta->sta;
1708        params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1709        if (params.status != 0) {
1710                ret = 0;
1711                goto call_drv;
1712        }
1713
1714        ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1715                               skb->len - baselen, false, &elems);
1716        if (elems.parse_error) {
1717                tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1718                ret = -EINVAL;
1719                goto out;
1720        }
1721
1722        if (!elems.ch_sw_timing || !elems.lnk_id) {
1723                tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1724                ret = -EINVAL;
1725                goto out;
1726        }
1727
1728        /* validate the initiator is set correctly */
1729        local_initiator =
1730                !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1731        if (local_initiator == sta->sta.tdls_initiator) {
1732                tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1733                ret = -EINVAL;
1734                goto out;
1735        }
1736
1737        params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1738        params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1739
1740        params.tmpl_skb =
1741                ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1742        if (!params.tmpl_skb) {
1743                ret = -ENOENT;
1744                goto out;
1745        }
1746
1747        ret = 0;
1748call_drv:
1749        drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1750
1751        tdls_dbg(sdata,
1752                 "TDLS channel switch response received from %pM status %d\n",
1753                 tf->sa, params.status);
1754
1755out:
1756        mutex_unlock(&local->sta_mtx);
1757        dev_kfree_skb_any(params.tmpl_skb);
1758        return ret;
1759}
1760
1761static int
1762ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1763                                          struct sk_buff *skb)
1764{
1765        struct ieee80211_local *local = sdata->local;
1766        struct ieee802_11_elems elems;
1767        struct cfg80211_chan_def chandef;
1768        struct ieee80211_channel *chan;
1769        enum nl80211_channel_type chan_type;
1770        int freq;
1771        u8 target_channel, oper_class;
1772        bool local_initiator;
1773        struct sta_info *sta;
1774        enum nl80211_band band;
1775        struct ieee80211_tdls_data *tf = (void *)skb->data;
1776        struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1777        int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1778        struct ieee80211_tdls_ch_sw_params params = {};
1779        int ret = 0;
1780
1781        params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1782        params.timestamp = rx_status->device_timestamp;
1783
1784        if (skb->len < baselen) {
1785                tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1786                         skb->len);
1787                return -EINVAL;
1788        }
1789
1790        target_channel = tf->u.chan_switch_req.target_channel;
1791        oper_class = tf->u.chan_switch_req.oper_class;
1792
1793        /*
1794         * We can't easily infer the channel band. The operating class is
1795         * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1796         * solution here is to treat channels with number >14 as 5GHz ones,
1797         * and specifically check for the (oper_class, channel) combinations
1798         * where this doesn't hold. These are thankfully unique according to
1799         * IEEE802.11-2012.
1800         * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1801         * valid here.
1802         */
1803        if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1804             oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1805             target_channel < 14)
1806                band = NL80211_BAND_5GHZ;
1807        else
1808                band = target_channel < 14 ? NL80211_BAND_2GHZ :
1809                                             NL80211_BAND_5GHZ;
1810
1811        freq = ieee80211_channel_to_frequency(target_channel, band);
1812        if (freq == 0) {
1813                tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1814                         target_channel);
1815                return -EINVAL;
1816        }
1817
1818        chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1819        if (!chan) {
1820                tdls_dbg(sdata,
1821                         "Unsupported channel for TDLS chan switch: %d\n",
1822                         target_channel);
1823                return -EINVAL;
1824        }
1825
1826        ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1827                               skb->len - baselen, false, &elems);
1828        if (elems.parse_error) {
1829                tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1830                return -EINVAL;
1831        }
1832
1833        if (!elems.ch_sw_timing || !elems.lnk_id) {
1834                tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1835                return -EINVAL;
1836        }
1837
1838        if (!elems.sec_chan_offs) {
1839                chan_type = NL80211_CHAN_HT20;
1840        } else {
1841                switch (elems.sec_chan_offs->sec_chan_offs) {
1842                case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1843                        chan_type = NL80211_CHAN_HT40PLUS;
1844                        break;
1845                case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1846                        chan_type = NL80211_CHAN_HT40MINUS;
1847                        break;
1848                default:
1849                        chan_type = NL80211_CHAN_HT20;
1850                        break;
1851                }
1852        }
1853
1854        cfg80211_chandef_create(&chandef, chan, chan_type);
1855
1856        /* we will be active on the TDLS link */
1857        if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1858                                           sdata->wdev.iftype)) {
1859                tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1860                return -EINVAL;
1861        }
1862
1863        mutex_lock(&local->sta_mtx);
1864        sta = sta_info_get(sdata, tf->sa);
1865        if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1866                tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1867                         tf->sa);
1868                ret = -EINVAL;
1869                goto out;
1870        }
1871
1872        params.sta = &sta->sta;
1873
1874        /* validate the initiator is set correctly */
1875        local_initiator =
1876                !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1877        if (local_initiator == sta->sta.tdls_initiator) {
1878                tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1879                ret = -EINVAL;
1880                goto out;
1881        }
1882
1883        /* peer should have known better */
1884        if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1885            elems.sec_chan_offs->sec_chan_offs) {
1886                tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1887                ret = -ENOTSUPP;
1888                goto out;
1889        }
1890
1891        params.chandef = &chandef;
1892        params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1893        params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1894
1895        params.tmpl_skb =
1896                ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1897                                                   &params.ch_sw_tm_ie);
1898        if (!params.tmpl_skb) {
1899                ret = -ENOENT;
1900                goto out;
1901        }
1902
1903        drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1904
1905        tdls_dbg(sdata,
1906                 "TDLS ch switch request received from %pM ch %d width %d\n",
1907                 tf->sa, params.chandef->chan->center_freq,
1908                 params.chandef->width);
1909out:
1910        mutex_unlock(&local->sta_mtx);
1911        dev_kfree_skb_any(params.tmpl_skb);
1912        return ret;
1913}
1914
1915static void
1916ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1917                                      struct sk_buff *skb)
1918{
1919        struct ieee80211_tdls_data *tf = (void *)skb->data;
1920        struct wiphy *wiphy = sdata->local->hw.wiphy;
1921
1922        ASSERT_RTNL();
1923
1924        /* make sure the driver supports it */
1925        if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1926                return;
1927
1928        /* we want to access the entire packet */
1929        if (skb_linearize(skb))
1930                return;
1931        /*
1932         * The packet/size was already validated by mac80211 Rx path, only look
1933         * at the action type.
1934         */
1935        switch (tf->action_code) {
1936        case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1937                ieee80211_process_tdls_channel_switch_req(sdata, skb);
1938                break;
1939        case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1940                ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1941                break;
1942        default:
1943                WARN_ON_ONCE(1);
1944                return;
1945        }
1946}
1947
1948void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1949{
1950        struct sta_info *sta;
1951        u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1952
1953        rcu_read_lock();
1954        list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1955                if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1956                    !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1957                        continue;
1958
1959                ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1960                                            NL80211_TDLS_TEARDOWN, reason,
1961                                            GFP_ATOMIC);
1962        }
1963        rcu_read_unlock();
1964}
1965
1966void ieee80211_tdls_chsw_work(struct work_struct *wk)
1967{
1968        struct ieee80211_local *local =
1969                container_of(wk, struct ieee80211_local, tdls_chsw_work);
1970        struct ieee80211_sub_if_data *sdata;
1971        struct sk_buff *skb;
1972        struct ieee80211_tdls_data *tf;
1973
1974        rtnl_lock();
1975        while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1976                tf = (struct ieee80211_tdls_data *)skb->data;
1977                list_for_each_entry(sdata, &local->interfaces, list) {
1978                        if (!ieee80211_sdata_running(sdata) ||
1979                            sdata->vif.type != NL80211_IFTYPE_STATION ||
1980                            !ether_addr_equal(tf->da, sdata->vif.addr))
1981                                continue;
1982
1983                        ieee80211_process_tdls_channel_switch(sdata, skb);
1984                        break;
1985                }
1986
1987                kfree_skb(skb);
1988        }
1989        rtnl_unlock();
1990}
1991