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 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 19 /* give usermode some time for retries in setting up the TDLS session */ 20 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ) 21 22 void ieee80211_tdls_peer_del_work(struct work_struct *wk) 23 { 24 struct ieee80211_sub_if_data *sdata; 25 struct ieee80211_local *local; 26 27 sdata = container_of(wk, struct ieee80211_sub_if_data, 28 u.mgd.tdls_peer_del_work.work); 29 local = sdata->local; 30 31 mutex_lock(&local->mtx); 32 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) { 33 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer); 34 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer); 35 eth_zero_addr(sdata->u.mgd.tdls_peer); 36 } 37 mutex_unlock(&local->mtx); 38 } 39 40 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata, 41 struct sk_buff *skb) 42 { 43 struct ieee80211_local *local = sdata->local; 44 bool chan_switch = local->hw.wiphy->features & 45 NL80211_FEATURE_TDLS_CHANNEL_SWITCH; 46 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW); 47 enum ieee80211_band band = ieee80211_get_sdata_band(sdata); 48 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; 49 bool vht = sband && sband->vht_cap.vht_supported; 50 u8 *pos = (void *)skb_put(skb, 10); 51 52 *pos++ = WLAN_EID_EXT_CAPABILITY; 53 *pos++ = 8; /* len */ 54 *pos++ = 0x0; 55 *pos++ = 0x0; 56 *pos++ = 0x0; 57 *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0; 58 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED; 59 *pos++ = 0; 60 *pos++ = 0; 61 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0; 62 } 63 64 static u8 65 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata, 66 struct sk_buff *skb, u16 start, u16 end, 67 u16 spacing) 68 { 69 u8 subband_cnt = 0, ch_cnt = 0; 70 struct ieee80211_channel *ch; 71 struct cfg80211_chan_def chandef; 72 int i, subband_start; 73 struct wiphy *wiphy = sdata->local->hw.wiphy; 74 75 for (i = start; i <= end; i += spacing) { 76 if (!ch_cnt) 77 subband_start = i; 78 79 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i); 80 if (ch) { 81 /* we will be active on the channel */ 82 cfg80211_chandef_create(&chandef, ch, 83 NL80211_CHAN_NO_HT); 84 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef, 85 sdata->wdev.iftype)) { 86 ch_cnt++; 87 /* 88 * check if the next channel is also part of 89 * this allowed range 90 */ 91 continue; 92 } 93 } 94 95 /* 96 * we've reached the end of a range, with allowed channels 97 * found 98 */ 99 if (ch_cnt) { 100 u8 *pos = skb_put(skb, 2); 101 *pos++ = ieee80211_frequency_to_channel(subband_start); 102 *pos++ = ch_cnt; 103 104 subband_cnt++; 105 ch_cnt = 0; 106 } 107 } 108 109 /* all channels in the requested range are allowed - add them here */ 110 if (ch_cnt) { 111 u8 *pos = skb_put(skb, 2); 112 *pos++ = ieee80211_frequency_to_channel(subband_start); 113 *pos++ = ch_cnt; 114 115 subband_cnt++; 116 } 117 118 return subband_cnt; 119 } 120 121 static void 122 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata, 123 struct sk_buff *skb) 124 { 125 /* 126 * Add possible channels for TDLS. These are channels that are allowed 127 * to be active. 128 */ 129 u8 subband_cnt; 130 u8 *pos = skb_put(skb, 2); 131 132 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 133 134 /* 135 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as 136 * this doesn't happen in real world scenarios. 137 */ 138 139 /* 2GHz, with 5MHz spacing */ 140 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5); 141 142 /* 5GHz, with 20MHz spacing */ 143 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20); 144 145 /* length */ 146 *pos = 2 * subband_cnt; 147 } 148 149 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata, 150 struct sk_buff *skb) 151 { 152 u8 *pos; 153 u8 op_class; 154 155 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef, 156 &op_class)) 157 return; 158 159 pos = skb_put(skb, 4); 160 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES; 161 *pos++ = 2; /* len */ 162 163 *pos++ = op_class; 164 *pos++ = op_class; /* give current operating class as alternate too */ 165 } 166 167 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb) 168 { 169 u8 *pos = (void *)skb_put(skb, 3); 170 171 *pos++ = WLAN_EID_BSS_COEX_2040; 172 *pos++ = 1; /* len */ 173 174 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST; 175 } 176 177 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata, 178 u16 status_code) 179 { 180 /* The capability will be 0 when sending a failure code */ 181 if (status_code != 0) 182 return 0; 183 184 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_2GHZ) { 185 return WLAN_CAPABILITY_SHORT_SLOT_TIME | 186 WLAN_CAPABILITY_SHORT_PREAMBLE; 187 } 188 189 return 0; 190 } 191 192 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata, 193 struct sk_buff *skb, const u8 *peer, 194 bool initiator) 195 { 196 struct ieee80211_tdls_lnkie *lnkid; 197 const u8 *init_addr, *rsp_addr; 198 199 if (initiator) { 200 init_addr = sdata->vif.addr; 201 rsp_addr = peer; 202 } else { 203 init_addr = peer; 204 rsp_addr = sdata->vif.addr; 205 } 206 207 lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie)); 208 209 lnkid->ie_type = WLAN_EID_LINK_ID; 210 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2; 211 212 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN); 213 memcpy(lnkid->init_sta, init_addr, ETH_ALEN); 214 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN); 215 } 216 217 static void 218 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 219 { 220 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 221 u8 *pos = (void *)skb_put(skb, 4); 222 223 *pos++ = WLAN_EID_AID; 224 *pos++ = 2; /* len */ 225 put_unaligned_le16(ifmgd->aid, pos); 226 } 227 228 /* translate numbering in the WMM parameter IE to the mac80211 notation */ 229 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac) 230 { 231 switch (ac) { 232 default: 233 WARN_ON_ONCE(1); 234 case 0: 235 return IEEE80211_AC_BE; 236 case 1: 237 return IEEE80211_AC_BK; 238 case 2: 239 return IEEE80211_AC_VI; 240 case 3: 241 return IEEE80211_AC_VO; 242 } 243 } 244 245 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci) 246 { 247 u8 ret; 248 249 ret = aifsn & 0x0f; 250 if (acm) 251 ret |= 0x10; 252 ret |= (aci << 5) & 0x60; 253 return ret; 254 } 255 256 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max) 257 { 258 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) | 259 ((ilog2(cw_max + 1) << 0x4) & 0xf0); 260 } 261 262 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata, 263 struct sk_buff *skb) 264 { 265 struct ieee80211_wmm_param_ie *wmm; 266 struct ieee80211_tx_queue_params *txq; 267 int i; 268 269 wmm = (void *)skb_put(skb, sizeof(*wmm)); 270 memset(wmm, 0, sizeof(*wmm)); 271 272 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC; 273 wmm->len = sizeof(*wmm) - 2; 274 275 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */ 276 wmm->oui[1] = 0x50; 277 wmm->oui[2] = 0xf2; 278 wmm->oui_type = 2; /* WME */ 279 wmm->oui_subtype = 1; /* WME param */ 280 wmm->version = 1; /* WME ver */ 281 wmm->qos_info = 0; /* U-APSD not in use */ 282 283 /* 284 * Use the EDCA parameters defined for the BSS, or default if the AP 285 * doesn't support it, as mandated by 802.11-2012 section 10.22.4 286 */ 287 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 288 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)]; 289 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs, 290 txq->acm, i); 291 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max); 292 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop); 293 } 294 } 295 296 static void 297 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata, 298 struct sta_info *sta) 299 { 300 /* IEEE802.11ac-2013 Table E-4 */ 301 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 }; 302 struct cfg80211_chan_def uc = sta->tdls_chandef; 303 enum nl80211_chan_width max_width = ieee80211_get_sta_bw(&sta->sta); 304 int i; 305 306 /* only support upgrading non-narrow channels up to 80Mhz */ 307 if (max_width == NL80211_CHAN_WIDTH_5 || 308 max_width == NL80211_CHAN_WIDTH_10) 309 return; 310 311 if (max_width > NL80211_CHAN_WIDTH_80) 312 max_width = NL80211_CHAN_WIDTH_80; 313 314 if (uc.width == max_width) 315 return; 316 /* 317 * Channel usage constrains in the IEEE802.11ac-2013 specification only 318 * allow expanding a 20MHz channel to 80MHz in a single way. In 319 * addition, there are no 40MHz allowed channels that are not part of 320 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here). 321 */ 322 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++) 323 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) { 324 uc.center_freq1 = centers_80mhz[i]; 325 uc.width = NL80211_CHAN_WIDTH_80; 326 break; 327 } 328 329 if (!uc.center_freq1) 330 return; 331 332 /* proceed to downgrade the chandef until usable or the same */ 333 while (uc.width > max_width && 334 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, 335 &uc, sdata->wdev.iftype)) 336 ieee80211_chandef_downgrade(&uc); 337 338 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) { 339 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n", 340 sta->tdls_chandef.width, uc.width); 341 342 /* 343 * the station is not yet authorized when BW upgrade is done, 344 * locking is not required 345 */ 346 sta->tdls_chandef = uc; 347 } 348 } 349 350 static void 351 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata, 352 struct sk_buff *skb, const u8 *peer, 353 u8 action_code, bool initiator, 354 const u8 *extra_ies, size_t extra_ies_len) 355 { 356 enum ieee80211_band band = ieee80211_get_sdata_band(sdata); 357 struct ieee80211_local *local = sdata->local; 358 struct ieee80211_supported_band *sband; 359 struct ieee80211_sta_ht_cap ht_cap; 360 struct ieee80211_sta_vht_cap vht_cap; 361 struct sta_info *sta = NULL; 362 size_t offset = 0, noffset; 363 u8 *pos; 364 365 ieee80211_add_srates_ie(sdata, skb, false, band); 366 ieee80211_add_ext_srates_ie(sdata, skb, false, band); 367 ieee80211_tdls_add_supp_channels(sdata, skb); 368 369 /* add any custom IEs that go before Extended Capabilities */ 370 if (extra_ies_len) { 371 static const u8 before_ext_cap[] = { 372 WLAN_EID_SUPP_RATES, 373 WLAN_EID_COUNTRY, 374 WLAN_EID_EXT_SUPP_RATES, 375 WLAN_EID_SUPPORTED_CHANNELS, 376 WLAN_EID_RSN, 377 }; 378 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 379 before_ext_cap, 380 ARRAY_SIZE(before_ext_cap), 381 offset); 382 pos = skb_put(skb, noffset - offset); 383 memcpy(pos, extra_ies + offset, noffset - offset); 384 offset = noffset; 385 } 386 387 ieee80211_tdls_add_ext_capab(sdata, skb); 388 389 /* add the QoS element if we support it */ 390 if (local->hw.queues >= IEEE80211_NUM_ACS && 391 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) 392 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */ 393 394 /* add any custom IEs that go before HT capabilities */ 395 if (extra_ies_len) { 396 static const u8 before_ht_cap[] = { 397 WLAN_EID_SUPP_RATES, 398 WLAN_EID_COUNTRY, 399 WLAN_EID_EXT_SUPP_RATES, 400 WLAN_EID_SUPPORTED_CHANNELS, 401 WLAN_EID_RSN, 402 WLAN_EID_EXT_CAPABILITY, 403 WLAN_EID_QOS_CAPA, 404 WLAN_EID_FAST_BSS_TRANSITION, 405 WLAN_EID_TIMEOUT_INTERVAL, 406 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 407 }; 408 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 409 before_ht_cap, 410 ARRAY_SIZE(before_ht_cap), 411 offset); 412 pos = skb_put(skb, noffset - offset); 413 memcpy(pos, extra_ies + offset, noffset - offset); 414 offset = noffset; 415 } 416 417 mutex_lock(&local->sta_mtx); 418 419 /* we should have the peer STA if we're already responding */ 420 if (action_code == WLAN_TDLS_SETUP_RESPONSE) { 421 sta = sta_info_get(sdata, peer); 422 if (WARN_ON_ONCE(!sta)) { 423 mutex_unlock(&local->sta_mtx); 424 return; 425 } 426 427 sta->tdls_chandef = sdata->vif.bss_conf.chandef; 428 } 429 430 ieee80211_tdls_add_oper_classes(sdata, skb); 431 432 /* 433 * with TDLS we can switch channels, and HT-caps are not necessarily 434 * the same on all bands. The specification limits the setup to a 435 * single HT-cap, so use the current band for now. 436 */ 437 sband = local->hw.wiphy->bands[band]; 438 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 439 440 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 441 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 442 ht_cap.ht_supported) { 443 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 444 445 /* disable SMPS in TDLS initiator */ 446 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED 447 << IEEE80211_HT_CAP_SM_PS_SHIFT; 448 449 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 450 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 451 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 452 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { 453 /* the peer caps are already intersected with our own */ 454 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap)); 455 456 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 457 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 458 } 459 460 if (ht_cap.ht_supported && 461 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 462 ieee80211_tdls_add_bss_coex_ie(skb); 463 464 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 465 466 /* add any custom IEs that go before VHT capabilities */ 467 if (extra_ies_len) { 468 static const u8 before_vht_cap[] = { 469 WLAN_EID_SUPP_RATES, 470 WLAN_EID_COUNTRY, 471 WLAN_EID_EXT_SUPP_RATES, 472 WLAN_EID_SUPPORTED_CHANNELS, 473 WLAN_EID_RSN, 474 WLAN_EID_EXT_CAPABILITY, 475 WLAN_EID_QOS_CAPA, 476 WLAN_EID_FAST_BSS_TRANSITION, 477 WLAN_EID_TIMEOUT_INTERVAL, 478 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 479 WLAN_EID_MULTI_BAND, 480 }; 481 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 482 before_vht_cap, 483 ARRAY_SIZE(before_vht_cap), 484 offset); 485 pos = skb_put(skb, noffset - offset); 486 memcpy(pos, extra_ies + offset, noffset - offset); 487 offset = noffset; 488 } 489 490 /* build the VHT-cap similarly to the HT-cap */ 491 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 492 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 493 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 494 vht_cap.vht_supported) { 495 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 496 497 /* the AID is present only when VHT is implemented */ 498 if (action_code == WLAN_TDLS_SETUP_REQUEST) 499 ieee80211_tdls_add_aid(sdata, skb); 500 501 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 502 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 503 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 504 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) { 505 /* the peer caps are already intersected with our own */ 506 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap)); 507 508 /* the AID is present only when VHT is implemented */ 509 ieee80211_tdls_add_aid(sdata, skb); 510 511 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 512 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 513 514 /* 515 * if both peers support WIDER_BW, we can expand the chandef to 516 * a wider compatible one, up to 80MHz 517 */ 518 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 519 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 520 } 521 522 mutex_unlock(&local->sta_mtx); 523 524 /* add any remaining IEs */ 525 if (extra_ies_len) { 526 noffset = extra_ies_len; 527 pos = skb_put(skb, noffset - offset); 528 memcpy(pos, extra_ies + offset, noffset - offset); 529 } 530 531 } 532 533 static void 534 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata, 535 struct sk_buff *skb, const u8 *peer, 536 bool initiator, const u8 *extra_ies, 537 size_t extra_ies_len) 538 { 539 struct ieee80211_local *local = sdata->local; 540 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 541 size_t offset = 0, noffset; 542 struct sta_info *sta, *ap_sta; 543 enum ieee80211_band band = ieee80211_get_sdata_band(sdata); 544 u8 *pos; 545 546 mutex_lock(&local->sta_mtx); 547 548 sta = sta_info_get(sdata, peer); 549 ap_sta = sta_info_get(sdata, ifmgd->bssid); 550 if (WARN_ON_ONCE(!sta || !ap_sta)) { 551 mutex_unlock(&local->sta_mtx); 552 return; 553 } 554 555 sta->tdls_chandef = sdata->vif.bss_conf.chandef; 556 557 /* add any custom IEs that go before the QoS IE */ 558 if (extra_ies_len) { 559 static const u8 before_qos[] = { 560 WLAN_EID_RSN, 561 }; 562 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 563 before_qos, 564 ARRAY_SIZE(before_qos), 565 offset); 566 pos = skb_put(skb, noffset - offset); 567 memcpy(pos, extra_ies + offset, noffset - offset); 568 offset = noffset; 569 } 570 571 /* add the QoS param IE if both the peer and we support it */ 572 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme) 573 ieee80211_tdls_add_wmm_param_ie(sdata, skb); 574 575 /* add any custom IEs that go before HT operation */ 576 if (extra_ies_len) { 577 static const u8 before_ht_op[] = { 578 WLAN_EID_RSN, 579 WLAN_EID_QOS_CAPA, 580 WLAN_EID_FAST_BSS_TRANSITION, 581 WLAN_EID_TIMEOUT_INTERVAL, 582 }; 583 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 584 before_ht_op, 585 ARRAY_SIZE(before_ht_op), 586 offset); 587 pos = skb_put(skb, noffset - offset); 588 memcpy(pos, extra_ies + offset, noffset - offset); 589 offset = noffset; 590 } 591 592 /* if HT support is only added in TDLS, we need an HT-operation IE */ 593 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { 594 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 595 /* send an empty HT operation IE */ 596 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap, 597 &sdata->vif.bss_conf.chandef, 0); 598 } 599 600 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 601 602 /* only include VHT-operation if not on the 2.4GHz band */ 603 if (band != IEEE80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) { 604 /* 605 * if both peers support WIDER_BW, we can expand the chandef to 606 * a wider compatible one, up to 80MHz 607 */ 608 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 609 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 610 611 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 612 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap, 613 &sta->tdls_chandef); 614 } 615 616 mutex_unlock(&local->sta_mtx); 617 618 /* add any remaining IEs */ 619 if (extra_ies_len) { 620 noffset = extra_ies_len; 621 pos = skb_put(skb, noffset - offset); 622 memcpy(pos, extra_ies + offset, noffset - offset); 623 } 624 } 625 626 static void 627 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata, 628 struct sk_buff *skb, const u8 *peer, 629 bool initiator, const u8 *extra_ies, 630 size_t extra_ies_len, u8 oper_class, 631 struct cfg80211_chan_def *chandef) 632 { 633 struct ieee80211_tdls_data *tf; 634 size_t offset = 0, noffset; 635 u8 *pos; 636 637 if (WARN_ON_ONCE(!chandef)) 638 return; 639 640 tf = (void *)skb->data; 641 tf->u.chan_switch_req.target_channel = 642 ieee80211_frequency_to_channel(chandef->chan->center_freq); 643 tf->u.chan_switch_req.oper_class = oper_class; 644 645 if (extra_ies_len) { 646 static const u8 before_lnkie[] = { 647 WLAN_EID_SECONDARY_CHANNEL_OFFSET, 648 }; 649 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 650 before_lnkie, 651 ARRAY_SIZE(before_lnkie), 652 offset); 653 pos = skb_put(skb, noffset - offset); 654 memcpy(pos, extra_ies + offset, noffset - offset); 655 offset = noffset; 656 } 657 658 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 659 660 /* add any remaining IEs */ 661 if (extra_ies_len) { 662 noffset = extra_ies_len; 663 pos = skb_put(skb, noffset - offset); 664 memcpy(pos, extra_ies + offset, noffset - offset); 665 } 666 } 667 668 static void 669 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata, 670 struct sk_buff *skb, const u8 *peer, 671 u16 status_code, bool initiator, 672 const u8 *extra_ies, 673 size_t extra_ies_len) 674 { 675 if (status_code == 0) 676 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 677 678 if (extra_ies_len) 679 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len); 680 } 681 682 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata, 683 struct sk_buff *skb, const u8 *peer, 684 u8 action_code, u16 status_code, 685 bool initiator, const u8 *extra_ies, 686 size_t extra_ies_len, u8 oper_class, 687 struct cfg80211_chan_def *chandef) 688 { 689 switch (action_code) { 690 case WLAN_TDLS_SETUP_REQUEST: 691 case WLAN_TDLS_SETUP_RESPONSE: 692 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 693 if (status_code == 0) 694 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer, 695 action_code, 696 initiator, 697 extra_ies, 698 extra_ies_len); 699 break; 700 case WLAN_TDLS_SETUP_CONFIRM: 701 if (status_code == 0) 702 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer, 703 initiator, extra_ies, 704 extra_ies_len); 705 break; 706 case WLAN_TDLS_TEARDOWN: 707 case WLAN_TDLS_DISCOVERY_REQUEST: 708 if (extra_ies_len) 709 memcpy(skb_put(skb, extra_ies_len), extra_ies, 710 extra_ies_len); 711 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN) 712 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 713 break; 714 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 715 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer, 716 initiator, extra_ies, 717 extra_ies_len, 718 oper_class, chandef); 719 break; 720 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 721 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer, 722 status_code, 723 initiator, extra_ies, 724 extra_ies_len); 725 break; 726 } 727 728 } 729 730 static int 731 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev, 732 const u8 *peer, u8 action_code, u8 dialog_token, 733 u16 status_code, struct sk_buff *skb) 734 { 735 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 736 struct ieee80211_tdls_data *tf; 737 738 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u)); 739 740 memcpy(tf->da, peer, ETH_ALEN); 741 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN); 742 tf->ether_type = cpu_to_be16(ETH_P_TDLS); 743 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE; 744 745 /* network header is after the ethernet header */ 746 skb_set_network_header(skb, ETH_HLEN); 747 748 switch (action_code) { 749 case WLAN_TDLS_SETUP_REQUEST: 750 tf->category = WLAN_CATEGORY_TDLS; 751 tf->action_code = WLAN_TDLS_SETUP_REQUEST; 752 753 skb_put(skb, sizeof(tf->u.setup_req)); 754 tf->u.setup_req.dialog_token = dialog_token; 755 tf->u.setup_req.capability = 756 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 757 status_code)); 758 break; 759 case WLAN_TDLS_SETUP_RESPONSE: 760 tf->category = WLAN_CATEGORY_TDLS; 761 tf->action_code = WLAN_TDLS_SETUP_RESPONSE; 762 763 skb_put(skb, sizeof(tf->u.setup_resp)); 764 tf->u.setup_resp.status_code = cpu_to_le16(status_code); 765 tf->u.setup_resp.dialog_token = dialog_token; 766 tf->u.setup_resp.capability = 767 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 768 status_code)); 769 break; 770 case WLAN_TDLS_SETUP_CONFIRM: 771 tf->category = WLAN_CATEGORY_TDLS; 772 tf->action_code = WLAN_TDLS_SETUP_CONFIRM; 773 774 skb_put(skb, sizeof(tf->u.setup_cfm)); 775 tf->u.setup_cfm.status_code = cpu_to_le16(status_code); 776 tf->u.setup_cfm.dialog_token = dialog_token; 777 break; 778 case WLAN_TDLS_TEARDOWN: 779 tf->category = WLAN_CATEGORY_TDLS; 780 tf->action_code = WLAN_TDLS_TEARDOWN; 781 782 skb_put(skb, sizeof(tf->u.teardown)); 783 tf->u.teardown.reason_code = cpu_to_le16(status_code); 784 break; 785 case WLAN_TDLS_DISCOVERY_REQUEST: 786 tf->category = WLAN_CATEGORY_TDLS; 787 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST; 788 789 skb_put(skb, sizeof(tf->u.discover_req)); 790 tf->u.discover_req.dialog_token = dialog_token; 791 break; 792 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 793 tf->category = WLAN_CATEGORY_TDLS; 794 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 795 796 skb_put(skb, sizeof(tf->u.chan_switch_req)); 797 break; 798 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 799 tf->category = WLAN_CATEGORY_TDLS; 800 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 801 802 skb_put(skb, sizeof(tf->u.chan_switch_resp)); 803 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code); 804 break; 805 default: 806 return -EINVAL; 807 } 808 809 return 0; 810 } 811 812 static int 813 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev, 814 const u8 *peer, u8 action_code, u8 dialog_token, 815 u16 status_code, struct sk_buff *skb) 816 { 817 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 818 struct ieee80211_mgmt *mgmt; 819 820 mgmt = (void *)skb_put(skb, 24); 821 memset(mgmt, 0, 24); 822 memcpy(mgmt->da, peer, ETH_ALEN); 823 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 824 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 825 826 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 827 IEEE80211_STYPE_ACTION); 828 829 switch (action_code) { 830 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 831 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp)); 832 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC; 833 mgmt->u.action.u.tdls_discover_resp.action_code = 834 WLAN_PUB_ACTION_TDLS_DISCOVER_RES; 835 mgmt->u.action.u.tdls_discover_resp.dialog_token = 836 dialog_token; 837 mgmt->u.action.u.tdls_discover_resp.capability = 838 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 839 status_code)); 840 break; 841 default: 842 return -EINVAL; 843 } 844 845 return 0; 846 } 847 848 static struct sk_buff * 849 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata, 850 const u8 *peer, u8 action_code, 851 u8 dialog_token, u16 status_code, 852 bool initiator, const u8 *extra_ies, 853 size_t extra_ies_len, u8 oper_class, 854 struct cfg80211_chan_def *chandef) 855 { 856 struct ieee80211_local *local = sdata->local; 857 struct sk_buff *skb; 858 int ret; 859 860 skb = netdev_alloc_skb(sdata->dev, 861 local->hw.extra_tx_headroom + 862 max(sizeof(struct ieee80211_mgmt), 863 sizeof(struct ieee80211_tdls_data)) + 864 50 + /* supported rates */ 865 10 + /* ext capab */ 866 26 + /* max(WMM-info, WMM-param) */ 867 2 + max(sizeof(struct ieee80211_ht_cap), 868 sizeof(struct ieee80211_ht_operation)) + 869 2 + max(sizeof(struct ieee80211_vht_cap), 870 sizeof(struct ieee80211_vht_operation)) + 871 50 + /* supported channels */ 872 3 + /* 40/20 BSS coex */ 873 4 + /* AID */ 874 4 + /* oper classes */ 875 extra_ies_len + 876 sizeof(struct ieee80211_tdls_lnkie)); 877 if (!skb) 878 return NULL; 879 880 skb_reserve(skb, local->hw.extra_tx_headroom); 881 882 switch (action_code) { 883 case WLAN_TDLS_SETUP_REQUEST: 884 case WLAN_TDLS_SETUP_RESPONSE: 885 case WLAN_TDLS_SETUP_CONFIRM: 886 case WLAN_TDLS_TEARDOWN: 887 case WLAN_TDLS_DISCOVERY_REQUEST: 888 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 889 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 890 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy, 891 sdata->dev, peer, 892 action_code, dialog_token, 893 status_code, skb); 894 break; 895 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 896 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev, 897 peer, action_code, 898 dialog_token, status_code, 899 skb); 900 break; 901 default: 902 ret = -ENOTSUPP; 903 break; 904 } 905 906 if (ret < 0) 907 goto fail; 908 909 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code, 910 initiator, extra_ies, extra_ies_len, oper_class, 911 chandef); 912 return skb; 913 914 fail: 915 dev_kfree_skb(skb); 916 return NULL; 917 } 918 919 static int 920 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, 921 const u8 *peer, u8 action_code, u8 dialog_token, 922 u16 status_code, u32 peer_capability, 923 bool initiator, const u8 *extra_ies, 924 size_t extra_ies_len, u8 oper_class, 925 struct cfg80211_chan_def *chandef) 926 { 927 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 928 struct sk_buff *skb = NULL; 929 struct sta_info *sta; 930 u32 flags = 0; 931 int ret = 0; 932 933 rcu_read_lock(); 934 sta = sta_info_get(sdata, peer); 935 936 /* infer the initiator if we can, to support old userspace */ 937 switch (action_code) { 938 case WLAN_TDLS_SETUP_REQUEST: 939 if (sta) { 940 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 941 sta->sta.tdls_initiator = false; 942 } 943 /* fall-through */ 944 case WLAN_TDLS_SETUP_CONFIRM: 945 case WLAN_TDLS_DISCOVERY_REQUEST: 946 initiator = true; 947 break; 948 case WLAN_TDLS_SETUP_RESPONSE: 949 /* 950 * In some testing scenarios, we send a request and response. 951 * Make the last packet sent take effect for the initiator 952 * value. 953 */ 954 if (sta) { 955 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 956 sta->sta.tdls_initiator = true; 957 } 958 /* fall-through */ 959 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 960 initiator = false; 961 break; 962 case WLAN_TDLS_TEARDOWN: 963 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 964 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 965 /* any value is ok */ 966 break; 967 default: 968 ret = -ENOTSUPP; 969 break; 970 } 971 972 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR)) 973 initiator = true; 974 975 rcu_read_unlock(); 976 if (ret < 0) 977 goto fail; 978 979 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code, 980 dialog_token, status_code, 981 initiator, extra_ies, 982 extra_ies_len, oper_class, 983 chandef); 984 if (!skb) { 985 ret = -EINVAL; 986 goto fail; 987 } 988 989 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { 990 ieee80211_tx_skb(sdata, skb); 991 return 0; 992 } 993 994 /* 995 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise 996 * we should default to AC_VI. 997 */ 998 switch (action_code) { 999 case WLAN_TDLS_SETUP_REQUEST: 1000 case WLAN_TDLS_SETUP_RESPONSE: 1001 skb_set_queue_mapping(skb, IEEE80211_AC_BK); 1002 skb->priority = 2; 1003 break; 1004 default: 1005 skb_set_queue_mapping(skb, IEEE80211_AC_VI); 1006 skb->priority = 5; 1007 break; 1008 } 1009 1010 /* 1011 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress. 1012 * Later, if no ACK is returned from peer, we will re-send the teardown 1013 * packet through the AP. 1014 */ 1015 if ((action_code == WLAN_TDLS_TEARDOWN) && 1016 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 1017 bool try_resend; /* Should we keep skb for possible resend */ 1018 1019 /* If not sending directly to peer - no point in keeping skb */ 1020 rcu_read_lock(); 1021 sta = sta_info_get(sdata, peer); 1022 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1023 rcu_read_unlock(); 1024 1025 spin_lock_bh(&sdata->u.mgd.teardown_lock); 1026 if (try_resend && !sdata->u.mgd.teardown_skb) { 1027 /* Mark it as requiring TX status callback */ 1028 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 1029 IEEE80211_TX_INTFL_MLME_CONN_TX; 1030 1031 /* 1032 * skb is copied since mac80211 will later set 1033 * properties that might not be the same as the AP, 1034 * such as encryption, QoS, addresses, etc. 1035 * 1036 * No problem if skb_copy() fails, so no need to check. 1037 */ 1038 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC); 1039 sdata->u.mgd.orig_teardown_skb = skb; 1040 } 1041 spin_unlock_bh(&sdata->u.mgd.teardown_lock); 1042 } 1043 1044 /* disable bottom halves when entering the Tx path */ 1045 local_bh_disable(); 1046 __ieee80211_subif_start_xmit(skb, dev, flags); 1047 local_bh_enable(); 1048 1049 return ret; 1050 1051 fail: 1052 dev_kfree_skb(skb); 1053 return ret; 1054 } 1055 1056 static int 1057 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, 1058 const u8 *peer, u8 action_code, u8 dialog_token, 1059 u16 status_code, u32 peer_capability, bool initiator, 1060 const u8 *extra_ies, size_t extra_ies_len) 1061 { 1062 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1063 struct ieee80211_local *local = sdata->local; 1064 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode; 1065 int ret; 1066 1067 /* don't support setup with forced SMPS mode that's not off */ 1068 if (smps_mode != IEEE80211_SMPS_AUTOMATIC && 1069 smps_mode != IEEE80211_SMPS_OFF) { 1070 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n", 1071 smps_mode); 1072 return -ENOTSUPP; 1073 } 1074 1075 mutex_lock(&local->mtx); 1076 1077 /* we don't support concurrent TDLS peer setups */ 1078 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && 1079 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1080 ret = -EBUSY; 1081 goto out_unlock; 1082 } 1083 1084 /* 1085 * make sure we have a STA representing the peer so we drop or buffer 1086 * non-TDLS-setup frames to the peer. We can't send other packets 1087 * during setup through the AP path. 1088 * Allow error packets to be sent - sometimes we don't even add a STA 1089 * before failing the setup. 1090 */ 1091 if (status_code == 0) { 1092 rcu_read_lock(); 1093 if (!sta_info_get(sdata, peer)) { 1094 rcu_read_unlock(); 1095 ret = -ENOLINK; 1096 goto out_unlock; 1097 } 1098 rcu_read_unlock(); 1099 } 1100 1101 ieee80211_flush_queues(local, sdata, false); 1102 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); 1103 mutex_unlock(&local->mtx); 1104 1105 /* we cannot take the mutex while preparing the setup packet */ 1106 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1107 dialog_token, status_code, 1108 peer_capability, initiator, 1109 extra_ies, extra_ies_len, 0, 1110 NULL); 1111 if (ret < 0) { 1112 mutex_lock(&local->mtx); 1113 eth_zero_addr(sdata->u.mgd.tdls_peer); 1114 mutex_unlock(&local->mtx); 1115 return ret; 1116 } 1117 1118 ieee80211_queue_delayed_work(&sdata->local->hw, 1119 &sdata->u.mgd.tdls_peer_del_work, 1120 TDLS_PEER_SETUP_TIMEOUT); 1121 return 0; 1122 1123 out_unlock: 1124 mutex_unlock(&local->mtx); 1125 return ret; 1126 } 1127 1128 static int 1129 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, 1130 const u8 *peer, u8 action_code, u8 dialog_token, 1131 u16 status_code, u32 peer_capability, 1132 bool initiator, const u8 *extra_ies, 1133 size_t extra_ies_len) 1134 { 1135 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1136 struct ieee80211_local *local = sdata->local; 1137 struct sta_info *sta; 1138 int ret; 1139 1140 /* 1141 * No packets can be transmitted to the peer via the AP during setup - 1142 * the STA is set as a TDLS peer, but is not authorized. 1143 * During teardown, we prevent direct transmissions by stopping the 1144 * queues and flushing all direct packets. 1145 */ 1146 ieee80211_stop_vif_queues(local, sdata, 1147 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1148 ieee80211_flush_queues(local, sdata, false); 1149 1150 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1151 dialog_token, status_code, 1152 peer_capability, initiator, 1153 extra_ies, extra_ies_len, 0, 1154 NULL); 1155 if (ret < 0) 1156 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", 1157 ret); 1158 1159 /* 1160 * Remove the STA AUTH flag to force further traffic through the AP. If 1161 * the STA was unreachable, it was already removed. 1162 */ 1163 rcu_read_lock(); 1164 sta = sta_info_get(sdata, peer); 1165 if (sta) 1166 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1167 rcu_read_unlock(); 1168 1169 ieee80211_wake_vif_queues(local, sdata, 1170 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1171 1172 return 0; 1173 } 1174 1175 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 1176 const u8 *peer, u8 action_code, u8 dialog_token, 1177 u16 status_code, u32 peer_capability, 1178 bool initiator, const u8 *extra_ies, 1179 size_t extra_ies_len) 1180 { 1181 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1182 int ret; 1183 1184 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1185 return -ENOTSUPP; 1186 1187 /* make sure we are in managed mode, and associated */ 1188 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1189 !sdata->u.mgd.associated) 1190 return -EINVAL; 1191 1192 switch (action_code) { 1193 case WLAN_TDLS_SETUP_REQUEST: 1194 case WLAN_TDLS_SETUP_RESPONSE: 1195 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code, 1196 dialog_token, status_code, 1197 peer_capability, initiator, 1198 extra_ies, extra_ies_len); 1199 break; 1200 case WLAN_TDLS_TEARDOWN: 1201 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, 1202 action_code, dialog_token, 1203 status_code, 1204 peer_capability, initiator, 1205 extra_ies, extra_ies_len); 1206 break; 1207 case WLAN_TDLS_DISCOVERY_REQUEST: 1208 /* 1209 * Protect the discovery so we can hear the TDLS discovery 1210 * response frame. It is transmitted directly and not buffered 1211 * by the AP. 1212 */ 1213 drv_mgd_protect_tdls_discover(sdata->local, sdata); 1214 /* fall-through */ 1215 case WLAN_TDLS_SETUP_CONFIRM: 1216 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1217 /* no special handling */ 1218 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1219 action_code, 1220 dialog_token, 1221 status_code, 1222 peer_capability, 1223 initiator, extra_ies, 1224 extra_ies_len, 0, NULL); 1225 break; 1226 default: 1227 ret = -EOPNOTSUPP; 1228 break; 1229 } 1230 1231 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n", 1232 action_code, peer, ret); 1233 return ret; 1234 } 1235 1236 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata) 1237 { 1238 struct ieee80211_local *local = sdata->local; 1239 struct ieee80211_chanctx_conf *conf; 1240 struct ieee80211_chanctx *ctx; 1241 1242 mutex_lock(&local->chanctx_mtx); 1243 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1244 lockdep_is_held(&local->chanctx_mtx)); 1245 if (conf) { 1246 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1247 ieee80211_recalc_chanctx_chantype(local, ctx); 1248 } 1249 mutex_unlock(&local->chanctx_mtx); 1250 } 1251 1252 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 1253 const u8 *peer, enum nl80211_tdls_operation oper) 1254 { 1255 struct sta_info *sta; 1256 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1257 struct ieee80211_local *local = sdata->local; 1258 int ret; 1259 1260 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1261 return -ENOTSUPP; 1262 1263 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1264 return -EINVAL; 1265 1266 switch (oper) { 1267 case NL80211_TDLS_ENABLE_LINK: 1268 case NL80211_TDLS_DISABLE_LINK: 1269 break; 1270 case NL80211_TDLS_TEARDOWN: 1271 case NL80211_TDLS_SETUP: 1272 case NL80211_TDLS_DISCOVERY_REQ: 1273 /* We don't support in-driver setup/teardown/discovery */ 1274 return -ENOTSUPP; 1275 } 1276 1277 mutex_lock(&local->mtx); 1278 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); 1279 1280 switch (oper) { 1281 case NL80211_TDLS_ENABLE_LINK: 1282 if (sdata->vif.csa_active) { 1283 tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); 1284 ret = -EBUSY; 1285 break; 1286 } 1287 1288 iee80211_tdls_recalc_chanctx(sdata); 1289 1290 rcu_read_lock(); 1291 sta = sta_info_get(sdata, peer); 1292 if (!sta) { 1293 rcu_read_unlock(); 1294 ret = -ENOLINK; 1295 break; 1296 } 1297 1298 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1299 rcu_read_unlock(); 1300 1301 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || 1302 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); 1303 ret = 0; 1304 break; 1305 case NL80211_TDLS_DISABLE_LINK: 1306 /* 1307 * The teardown message in ieee80211_tdls_mgmt_teardown() was 1308 * created while the queues were stopped, so it might still be 1309 * pending. Before flushing the queues we need to be sure the 1310 * message is handled by the tasklet handling pending messages, 1311 * otherwise we might start destroying the station before 1312 * sending the teardown packet. 1313 * Note that this only forces the tasklet to flush pendings - 1314 * not to stop the tasklet from rescheduling itself. 1315 */ 1316 tasklet_kill(&local->tx_pending_tasklet); 1317 /* flush a potentially queued teardown packet */ 1318 ieee80211_flush_queues(local, sdata, false); 1319 1320 ret = sta_info_destroy_addr(sdata, peer); 1321 iee80211_tdls_recalc_chanctx(sdata); 1322 break; 1323 default: 1324 ret = -ENOTSUPP; 1325 break; 1326 } 1327 1328 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1329 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work); 1330 eth_zero_addr(sdata->u.mgd.tdls_peer); 1331 } 1332 1333 if (ret == 0) 1334 ieee80211_queue_work(&sdata->local->hw, 1335 &sdata->u.mgd.request_smps_work); 1336 1337 mutex_unlock(&local->mtx); 1338 return ret; 1339 } 1340 1341 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, 1342 enum nl80211_tdls_operation oper, 1343 u16 reason_code, gfp_t gfp) 1344 { 1345 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1346 1347 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) { 1348 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", 1349 oper); 1350 return; 1351 } 1352 1353 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); 1354 } 1355 EXPORT_SYMBOL(ieee80211_tdls_oper_request); 1356 1357 static void 1358 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) 1359 { 1360 struct ieee80211_ch_switch_timing *ch_sw; 1361 1362 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; 1363 *buf++ = sizeof(struct ieee80211_ch_switch_timing); 1364 1365 ch_sw = (void *)buf; 1366 ch_sw->switch_time = cpu_to_le16(switch_time); 1367 ch_sw->switch_timeout = cpu_to_le16(switch_timeout); 1368 } 1369 1370 /* find switch timing IE in SKB ready for Tx */ 1371 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) 1372 { 1373 struct ieee80211_tdls_data *tf; 1374 const u8 *ie_start; 1375 1376 /* 1377 * Get the offset for the new location of the switch timing IE. 1378 * The SKB network header will now point to the "payload_type" 1379 * element of the TDLS data frame struct. 1380 */ 1381 tf = container_of(skb->data + skb_network_offset(skb), 1382 struct ieee80211_tdls_data, payload_type); 1383 ie_start = tf->u.chan_switch_req.variable; 1384 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, 1385 skb->len - (ie_start - skb->data)); 1386 } 1387 1388 static struct sk_buff * 1389 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, 1390 struct cfg80211_chan_def *chandef, 1391 u32 *ch_sw_tm_ie_offset) 1392 { 1393 struct ieee80211_sub_if_data *sdata = sta->sdata; 1394 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 1395 2 + sizeof(struct ieee80211_ch_switch_timing)]; 1396 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); 1397 u8 *pos = extra_ies; 1398 struct sk_buff *skb; 1399 1400 /* 1401 * if chandef points to a wide channel add a Secondary-Channel 1402 * Offset information element 1403 */ 1404 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1405 struct ieee80211_sec_chan_offs_ie *sec_chan_ie; 1406 bool ht40plus; 1407 1408 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 1409 *pos++ = sizeof(*sec_chan_ie); 1410 sec_chan_ie = (void *)pos; 1411 1412 ht40plus = cfg80211_get_chandef_type(chandef) == 1413 NL80211_CHAN_HT40PLUS; 1414 sec_chan_ie->sec_chan_offs = ht40plus ? 1415 IEEE80211_HT_PARAM_CHA_SEC_ABOVE : 1416 IEEE80211_HT_PARAM_CHA_SEC_BELOW; 1417 pos += sizeof(*sec_chan_ie); 1418 1419 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 1420 } 1421 1422 /* just set the values to 0, this is a template */ 1423 iee80211_tdls_add_ch_switch_timing(pos, 0, 0); 1424 1425 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1426 WLAN_TDLS_CHANNEL_SWITCH_REQUEST, 1427 0, 0, !sta->sta.tdls_initiator, 1428 extra_ies, extra_ies_len, 1429 oper_class, chandef); 1430 if (!skb) 1431 return NULL; 1432 1433 skb = ieee80211_build_data_template(sdata, skb, 0); 1434 if (IS_ERR(skb)) { 1435 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); 1436 return NULL; 1437 } 1438 1439 if (ch_sw_tm_ie_offset) { 1440 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1441 1442 if (!tm_ie) { 1443 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); 1444 dev_kfree_skb_any(skb); 1445 return NULL; 1446 } 1447 1448 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1449 } 1450 1451 tdls_dbg(sdata, 1452 "TDLS channel switch request template for %pM ch %d width %d\n", 1453 sta->sta.addr, chandef->chan->center_freq, chandef->width); 1454 return skb; 1455 } 1456 1457 int 1458 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, 1459 const u8 *addr, u8 oper_class, 1460 struct cfg80211_chan_def *chandef) 1461 { 1462 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1463 struct ieee80211_local *local = sdata->local; 1464 struct sta_info *sta; 1465 struct sk_buff *skb = NULL; 1466 u32 ch_sw_tm_ie; 1467 int ret; 1468 1469 mutex_lock(&local->sta_mtx); 1470 sta = sta_info_get(sdata, addr); 1471 if (!sta) { 1472 tdls_dbg(sdata, 1473 "Invalid TDLS peer %pM for channel switch request\n", 1474 addr); 1475 ret = -ENOENT; 1476 goto out; 1477 } 1478 1479 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { 1480 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", 1481 addr); 1482 ret = -ENOTSUPP; 1483 goto out; 1484 } 1485 1486 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, 1487 &ch_sw_tm_ie); 1488 if (!skb) { 1489 ret = -ENOENT; 1490 goto out; 1491 } 1492 1493 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, 1494 chandef, skb, ch_sw_tm_ie); 1495 if (!ret) 1496 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1497 1498 out: 1499 mutex_unlock(&local->sta_mtx); 1500 dev_kfree_skb_any(skb); 1501 return ret; 1502 } 1503 1504 void 1505 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, 1506 struct net_device *dev, 1507 const u8 *addr) 1508 { 1509 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1510 struct ieee80211_local *local = sdata->local; 1511 struct sta_info *sta; 1512 1513 mutex_lock(&local->sta_mtx); 1514 sta = sta_info_get(sdata, addr); 1515 if (!sta) { 1516 tdls_dbg(sdata, 1517 "Invalid TDLS peer %pM for channel switch cancel\n", 1518 addr); 1519 goto out; 1520 } 1521 1522 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 1523 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", 1524 addr); 1525 goto out; 1526 } 1527 1528 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 1529 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1530 1531 out: 1532 mutex_unlock(&local->sta_mtx); 1533 } 1534 1535 static struct sk_buff * 1536 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, 1537 u32 *ch_sw_tm_ie_offset) 1538 { 1539 struct ieee80211_sub_if_data *sdata = sta->sdata; 1540 struct sk_buff *skb; 1541 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; 1542 1543 /* initial timing are always zero in the template */ 1544 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); 1545 1546 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1547 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, 1548 0, 0, !sta->sta.tdls_initiator, 1549 extra_ies, sizeof(extra_ies), 0, NULL); 1550 if (!skb) 1551 return NULL; 1552 1553 skb = ieee80211_build_data_template(sdata, skb, 0); 1554 if (IS_ERR(skb)) { 1555 tdls_dbg(sdata, 1556 "Failed building TDLS channel switch resp frame\n"); 1557 return NULL; 1558 } 1559 1560 if (ch_sw_tm_ie_offset) { 1561 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1562 1563 if (!tm_ie) { 1564 tdls_dbg(sdata, 1565 "No switch timing IE in TDLS switch resp\n"); 1566 dev_kfree_skb_any(skb); 1567 return NULL; 1568 } 1569 1570 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1571 } 1572 1573 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", 1574 sta->sta.addr); 1575 return skb; 1576 } 1577 1578 static int 1579 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, 1580 struct sk_buff *skb) 1581 { 1582 struct ieee80211_local *local = sdata->local; 1583 struct ieee802_11_elems elems; 1584 struct sta_info *sta; 1585 struct ieee80211_tdls_data *tf = (void *)skb->data; 1586 bool local_initiator; 1587 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1588 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); 1589 struct ieee80211_tdls_ch_sw_params params = {}; 1590 int ret; 1591 1592 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 1593 params.timestamp = rx_status->device_timestamp; 1594 1595 if (skb->len < baselen) { 1596 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", 1597 skb->len); 1598 return -EINVAL; 1599 } 1600 1601 mutex_lock(&local->sta_mtx); 1602 sta = sta_info_get(sdata, tf->sa); 1603 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1604 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1605 tf->sa); 1606 ret = -EINVAL; 1607 goto out; 1608 } 1609 1610 params.sta = &sta->sta; 1611 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); 1612 if (params.status != 0) { 1613 ret = 0; 1614 goto call_drv; 1615 } 1616 1617 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, 1618 skb->len - baselen, false, &elems); 1619 if (elems.parse_error) { 1620 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); 1621 ret = -EINVAL; 1622 goto out; 1623 } 1624 1625 if (!elems.ch_sw_timing || !elems.lnk_id) { 1626 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); 1627 ret = -EINVAL; 1628 goto out; 1629 } 1630 1631 /* validate the initiator is set correctly */ 1632 local_initiator = 1633 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1634 if (local_initiator == sta->sta.tdls_initiator) { 1635 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1636 ret = -EINVAL; 1637 goto out; 1638 } 1639 1640 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); 1641 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); 1642 1643 params.tmpl_skb = 1644 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); 1645 if (!params.tmpl_skb) { 1646 ret = -ENOENT; 1647 goto out; 1648 } 1649 1650 call_drv: 1651 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1652 1653 tdls_dbg(sdata, 1654 "TDLS channel switch response received from %pM status %d\n", 1655 tf->sa, params.status); 1656 1657 out: 1658 mutex_unlock(&local->sta_mtx); 1659 dev_kfree_skb_any(params.tmpl_skb); 1660 return ret; 1661 } 1662 1663 static int 1664 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, 1665 struct sk_buff *skb) 1666 { 1667 struct ieee80211_local *local = sdata->local; 1668 struct ieee802_11_elems elems; 1669 struct cfg80211_chan_def chandef; 1670 struct ieee80211_channel *chan; 1671 enum nl80211_channel_type chan_type; 1672 int freq; 1673 u8 target_channel, oper_class; 1674 bool local_initiator; 1675 struct sta_info *sta; 1676 enum ieee80211_band band; 1677 struct ieee80211_tdls_data *tf = (void *)skb->data; 1678 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1679 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); 1680 struct ieee80211_tdls_ch_sw_params params = {}; 1681 int ret = 0; 1682 1683 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 1684 params.timestamp = rx_status->device_timestamp; 1685 1686 if (skb->len < baselen) { 1687 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", 1688 skb->len); 1689 return -EINVAL; 1690 } 1691 1692 target_channel = tf->u.chan_switch_req.target_channel; 1693 oper_class = tf->u.chan_switch_req.oper_class; 1694 1695 /* 1696 * We can't easily infer the channel band. The operating class is 1697 * ambiguous - there are multiple tables (US/Europe/JP/Global). The 1698 * solution here is to treat channels with number >14 as 5GHz ones, 1699 * and specifically check for the (oper_class, channel) combinations 1700 * where this doesn't hold. These are thankfully unique according to 1701 * IEEE802.11-2012. 1702 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as 1703 * valid here. 1704 */ 1705 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || 1706 oper_class == 4 || oper_class == 5 || oper_class == 6) && 1707 target_channel < 14) 1708 band = IEEE80211_BAND_5GHZ; 1709 else 1710 band = target_channel < 14 ? IEEE80211_BAND_2GHZ : 1711 IEEE80211_BAND_5GHZ; 1712 1713 freq = ieee80211_channel_to_frequency(target_channel, band); 1714 if (freq == 0) { 1715 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", 1716 target_channel); 1717 return -EINVAL; 1718 } 1719 1720 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 1721 if (!chan) { 1722 tdls_dbg(sdata, 1723 "Unsupported channel for TDLS chan switch: %d\n", 1724 target_channel); 1725 return -EINVAL; 1726 } 1727 1728 ieee802_11_parse_elems(tf->u.chan_switch_req.variable, 1729 skb->len - baselen, false, &elems); 1730 if (elems.parse_error) { 1731 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); 1732 return -EINVAL; 1733 } 1734 1735 if (!elems.ch_sw_timing || !elems.lnk_id) { 1736 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); 1737 return -EINVAL; 1738 } 1739 1740 if (!elems.sec_chan_offs) { 1741 chan_type = NL80211_CHAN_HT20; 1742 } else { 1743 switch (elems.sec_chan_offs->sec_chan_offs) { 1744 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 1745 chan_type = NL80211_CHAN_HT40PLUS; 1746 break; 1747 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 1748 chan_type = NL80211_CHAN_HT40MINUS; 1749 break; 1750 default: 1751 chan_type = NL80211_CHAN_HT20; 1752 break; 1753 } 1754 } 1755 1756 cfg80211_chandef_create(&chandef, chan, chan_type); 1757 1758 /* we will be active on the TDLS link */ 1759 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, 1760 sdata->wdev.iftype)) { 1761 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); 1762 return -EINVAL; 1763 } 1764 1765 mutex_lock(&local->sta_mtx); 1766 sta = sta_info_get(sdata, tf->sa); 1767 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1768 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1769 tf->sa); 1770 ret = -EINVAL; 1771 goto out; 1772 } 1773 1774 params.sta = &sta->sta; 1775 1776 /* validate the initiator is set correctly */ 1777 local_initiator = 1778 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1779 if (local_initiator == sta->sta.tdls_initiator) { 1780 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1781 ret = -EINVAL; 1782 goto out; 1783 } 1784 1785 /* peer should have known better */ 1786 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs && 1787 elems.sec_chan_offs->sec_chan_offs) { 1788 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); 1789 ret = -ENOTSUPP; 1790 goto out; 1791 } 1792 1793 params.chandef = &chandef; 1794 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); 1795 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); 1796 1797 params.tmpl_skb = 1798 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, 1799 ¶ms.ch_sw_tm_ie); 1800 if (!params.tmpl_skb) { 1801 ret = -ENOENT; 1802 goto out; 1803 } 1804 1805 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1806 1807 tdls_dbg(sdata, 1808 "TDLS ch switch request received from %pM ch %d width %d\n", 1809 tf->sa, params.chandef->chan->center_freq, 1810 params.chandef->width); 1811 out: 1812 mutex_unlock(&local->sta_mtx); 1813 dev_kfree_skb_any(params.tmpl_skb); 1814 return ret; 1815 } 1816 1817 static void 1818 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, 1819 struct sk_buff *skb) 1820 { 1821 struct ieee80211_tdls_data *tf = (void *)skb->data; 1822 struct wiphy *wiphy = sdata->local->hw.wiphy; 1823 1824 ASSERT_RTNL(); 1825 1826 /* make sure the driver supports it */ 1827 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) 1828 return; 1829 1830 /* we want to access the entire packet */ 1831 if (skb_linearize(skb)) 1832 return; 1833 /* 1834 * The packet/size was already validated by mac80211 Rx path, only look 1835 * at the action type. 1836 */ 1837 switch (tf->action_code) { 1838 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 1839 ieee80211_process_tdls_channel_switch_req(sdata, skb); 1840 break; 1841 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 1842 ieee80211_process_tdls_channel_switch_resp(sdata, skb); 1843 break; 1844 default: 1845 WARN_ON_ONCE(1); 1846 return; 1847 } 1848 } 1849 1850 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata) 1851 { 1852 struct sta_info *sta; 1853 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 1854 1855 rcu_read_lock(); 1856 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1857 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1858 !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 1859 continue; 1860 1861 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, 1862 NL80211_TDLS_TEARDOWN, reason, 1863 GFP_ATOMIC); 1864 } 1865 rcu_read_unlock(); 1866 } 1867 1868 void ieee80211_tdls_chsw_work(struct work_struct *wk) 1869 { 1870 struct ieee80211_local *local = 1871 container_of(wk, struct ieee80211_local, tdls_chsw_work); 1872 struct ieee80211_sub_if_data *sdata; 1873 struct sk_buff *skb; 1874 struct ieee80211_tdls_data *tf; 1875 1876 rtnl_lock(); 1877 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) { 1878 tf = (struct ieee80211_tdls_data *)skb->data; 1879 list_for_each_entry(sdata, &local->interfaces, list) { 1880 if (!ieee80211_sdata_running(sdata) || 1881 sdata->vif.type != NL80211_IFTYPE_STATION || 1882 !ether_addr_equal(tf->da, sdata->vif.addr)) 1883 continue; 1884 1885 ieee80211_process_tdls_channel_switch(sdata, skb); 1886 break; 1887 } 1888 1889 kfree_skb(skb); 1890 } 1891 rtnl_unlock(); 1892 } 1893