1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * mac80211 TDLS handling code 4 * 5 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2014, Intel Corporation 7 * Copyright 2014 Intel Mobile Communications GmbH 8 * Copyright 2015 - 2016 Intel Deutschland GmbH 9 * Copyright (C) 2019 Intel Corporation 10 */ 11 12 #include <linux/ieee80211.h> 13 #include <linux/log2.h> 14 #include <net/cfg80211.h> 15 #include <linux/rtnetlink.h> 16 #include "ieee80211_i.h" 17 #include "driver-ops.h" 18 #include "rate.h" 19 #include "wme.h" 20 21 /* give usermode some time for retries in setting up the TDLS session */ 22 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ) 23 24 void ieee80211_tdls_peer_del_work(struct work_struct *wk) 25 { 26 struct ieee80211_sub_if_data *sdata; 27 struct ieee80211_local *local; 28 29 sdata = container_of(wk, struct ieee80211_sub_if_data, 30 u.mgd.tdls_peer_del_work.work); 31 local = sdata->local; 32 33 mutex_lock(&local->mtx); 34 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) { 35 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer); 36 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer); 37 eth_zero_addr(sdata->u.mgd.tdls_peer); 38 } 39 mutex_unlock(&local->mtx); 40 } 41 42 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata, 43 struct sk_buff *skb) 44 { 45 struct ieee80211_local *local = sdata->local; 46 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 47 bool chan_switch = local->hw.wiphy->features & 48 NL80211_FEATURE_TDLS_CHANNEL_SWITCH; 49 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) && 50 !ifmgd->tdls_wider_bw_prohibited; 51 bool buffer_sta = ieee80211_hw_check(&local->hw, 52 SUPPORTS_TDLS_BUFFER_STA); 53 struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata); 54 bool vht = sband && sband->vht_cap.vht_supported; 55 u8 *pos = skb_put(skb, 10); 56 57 *pos++ = WLAN_EID_EXT_CAPABILITY; 58 *pos++ = 8; /* len */ 59 *pos++ = 0x0; 60 *pos++ = 0x0; 61 *pos++ = 0x0; 62 *pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) | 63 (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0); 64 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED; 65 *pos++ = 0; 66 *pos++ = 0; 67 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0; 68 } 69 70 static u8 71 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata, 72 struct sk_buff *skb, u16 start, u16 end, 73 u16 spacing) 74 { 75 u8 subband_cnt = 0, ch_cnt = 0; 76 struct ieee80211_channel *ch; 77 struct cfg80211_chan_def chandef; 78 int i, subband_start; 79 struct wiphy *wiphy = sdata->local->hw.wiphy; 80 81 for (i = start; i <= end; i += spacing) { 82 if (!ch_cnt) 83 subband_start = i; 84 85 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i); 86 if (ch) { 87 /* we will be active on the channel */ 88 cfg80211_chandef_create(&chandef, ch, 89 NL80211_CHAN_NO_HT); 90 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef, 91 sdata->wdev.iftype)) { 92 ch_cnt++; 93 /* 94 * check if the next channel is also part of 95 * this allowed range 96 */ 97 continue; 98 } 99 } 100 101 /* 102 * we've reached the end of a range, with allowed channels 103 * found 104 */ 105 if (ch_cnt) { 106 u8 *pos = skb_put(skb, 2); 107 *pos++ = ieee80211_frequency_to_channel(subband_start); 108 *pos++ = ch_cnt; 109 110 subband_cnt++; 111 ch_cnt = 0; 112 } 113 } 114 115 /* all channels in the requested range are allowed - add them here */ 116 if (ch_cnt) { 117 u8 *pos = skb_put(skb, 2); 118 *pos++ = ieee80211_frequency_to_channel(subband_start); 119 *pos++ = ch_cnt; 120 121 subband_cnt++; 122 } 123 124 return subband_cnt; 125 } 126 127 static void 128 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata, 129 struct sk_buff *skb) 130 { 131 /* 132 * Add possible channels for TDLS. These are channels that are allowed 133 * to be active. 134 */ 135 u8 subband_cnt; 136 u8 *pos = skb_put(skb, 2); 137 138 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 139 140 /* 141 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as 142 * this doesn't happen in real world scenarios. 143 */ 144 145 /* 2GHz, with 5MHz spacing */ 146 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5); 147 148 /* 5GHz, with 20MHz spacing */ 149 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20); 150 151 /* length */ 152 *pos = 2 * subband_cnt; 153 } 154 155 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata, 156 struct sk_buff *skb) 157 { 158 u8 *pos; 159 u8 op_class; 160 161 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef, 162 &op_class)) 163 return; 164 165 pos = skb_put(skb, 4); 166 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES; 167 *pos++ = 2; /* len */ 168 169 *pos++ = op_class; 170 *pos++ = op_class; /* give current operating class as alternate too */ 171 } 172 173 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb) 174 { 175 u8 *pos = skb_put(skb, 3); 176 177 *pos++ = WLAN_EID_BSS_COEX_2040; 178 *pos++ = 1; /* len */ 179 180 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST; 181 } 182 183 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata, 184 u16 status_code) 185 { 186 struct ieee80211_supported_band *sband; 187 188 /* The capability will be 0 when sending a failure code */ 189 if (status_code != 0) 190 return 0; 191 192 sband = ieee80211_get_sband(sdata); 193 if (sband && sband->band == NL80211_BAND_2GHZ) { 194 return WLAN_CAPABILITY_SHORT_SLOT_TIME | 195 WLAN_CAPABILITY_SHORT_PREAMBLE; 196 } 197 198 return 0; 199 } 200 201 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata, 202 struct sk_buff *skb, const u8 *peer, 203 bool initiator) 204 { 205 struct ieee80211_tdls_lnkie *lnkid; 206 const u8 *init_addr, *rsp_addr; 207 208 if (initiator) { 209 init_addr = sdata->vif.addr; 210 rsp_addr = peer; 211 } else { 212 init_addr = peer; 213 rsp_addr = sdata->vif.addr; 214 } 215 216 lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie)); 217 218 lnkid->ie_type = WLAN_EID_LINK_ID; 219 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2; 220 221 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN); 222 memcpy(lnkid->init_sta, init_addr, ETH_ALEN); 223 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN); 224 } 225 226 static void 227 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 228 { 229 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 230 u8 *pos = skb_put(skb, 4); 231 232 *pos++ = WLAN_EID_AID; 233 *pos++ = 2; /* len */ 234 put_unaligned_le16(ifmgd->aid, pos); 235 } 236 237 /* translate numbering in the WMM parameter IE to the mac80211 notation */ 238 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac) 239 { 240 switch (ac) { 241 default: 242 WARN_ON_ONCE(1); 243 /* fall through */ 244 case 0: 245 return IEEE80211_AC_BE; 246 case 1: 247 return IEEE80211_AC_BK; 248 case 2: 249 return IEEE80211_AC_VI; 250 case 3: 251 return IEEE80211_AC_VO; 252 } 253 } 254 255 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci) 256 { 257 u8 ret; 258 259 ret = aifsn & 0x0f; 260 if (acm) 261 ret |= 0x10; 262 ret |= (aci << 5) & 0x60; 263 return ret; 264 } 265 266 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max) 267 { 268 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) | 269 ((ilog2(cw_max + 1) << 0x4) & 0xf0); 270 } 271 272 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata, 273 struct sk_buff *skb) 274 { 275 struct ieee80211_wmm_param_ie *wmm; 276 struct ieee80211_tx_queue_params *txq; 277 int i; 278 279 wmm = skb_put_zero(skb, sizeof(*wmm)); 280 281 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC; 282 wmm->len = sizeof(*wmm) - 2; 283 284 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */ 285 wmm->oui[1] = 0x50; 286 wmm->oui[2] = 0xf2; 287 wmm->oui_type = 2; /* WME */ 288 wmm->oui_subtype = 1; /* WME param */ 289 wmm->version = 1; /* WME ver */ 290 wmm->qos_info = 0; /* U-APSD not in use */ 291 292 /* 293 * Use the EDCA parameters defined for the BSS, or default if the AP 294 * doesn't support it, as mandated by 802.11-2012 section 10.22.4 295 */ 296 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 297 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)]; 298 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs, 299 txq->acm, i); 300 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max); 301 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop); 302 } 303 } 304 305 static void 306 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata, 307 struct sta_info *sta) 308 { 309 /* IEEE802.11ac-2013 Table E-4 */ 310 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 }; 311 struct cfg80211_chan_def uc = sta->tdls_chandef; 312 enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta); 313 int i; 314 315 /* only support upgrading non-narrow channels up to 80Mhz */ 316 if (max_width == NL80211_CHAN_WIDTH_5 || 317 max_width == NL80211_CHAN_WIDTH_10) 318 return; 319 320 if (max_width > NL80211_CHAN_WIDTH_80) 321 max_width = NL80211_CHAN_WIDTH_80; 322 323 if (uc.width >= max_width) 324 return; 325 /* 326 * Channel usage constrains in the IEEE802.11ac-2013 specification only 327 * allow expanding a 20MHz channel to 80MHz in a single way. In 328 * addition, there are no 40MHz allowed channels that are not part of 329 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here). 330 */ 331 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++) 332 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) { 333 uc.center_freq1 = centers_80mhz[i]; 334 uc.center_freq2 = 0; 335 uc.width = NL80211_CHAN_WIDTH_80; 336 break; 337 } 338 339 if (!uc.center_freq1) 340 return; 341 342 /* proceed to downgrade the chandef until usable or the same as AP BW */ 343 while (uc.width > max_width || 344 (uc.width > sta->tdls_chandef.width && 345 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc, 346 sdata->wdev.iftype))) 347 ieee80211_chandef_downgrade(&uc); 348 349 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) { 350 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n", 351 sta->tdls_chandef.width, uc.width); 352 353 /* 354 * the station is not yet authorized when BW upgrade is done, 355 * locking is not required 356 */ 357 sta->tdls_chandef = uc; 358 } 359 } 360 361 static void 362 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata, 363 struct sk_buff *skb, const u8 *peer, 364 u8 action_code, bool initiator, 365 const u8 *extra_ies, size_t extra_ies_len) 366 { 367 struct ieee80211_supported_band *sband; 368 struct ieee80211_local *local = sdata->local; 369 struct ieee80211_sta_ht_cap ht_cap; 370 struct ieee80211_sta_vht_cap vht_cap; 371 struct sta_info *sta = NULL; 372 size_t offset = 0, noffset; 373 u8 *pos; 374 375 sband = ieee80211_get_sband(sdata); 376 if (!sband) 377 return; 378 379 ieee80211_add_srates_ie(sdata, skb, false, sband->band); 380 ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band); 381 ieee80211_tdls_add_supp_channels(sdata, skb); 382 383 /* add any custom IEs that go before Extended Capabilities */ 384 if (extra_ies_len) { 385 static const u8 before_ext_cap[] = { 386 WLAN_EID_SUPP_RATES, 387 WLAN_EID_COUNTRY, 388 WLAN_EID_EXT_SUPP_RATES, 389 WLAN_EID_SUPPORTED_CHANNELS, 390 WLAN_EID_RSN, 391 }; 392 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 393 before_ext_cap, 394 ARRAY_SIZE(before_ext_cap), 395 offset); 396 skb_put_data(skb, extra_ies + offset, noffset - offset); 397 offset = noffset; 398 } 399 400 ieee80211_tdls_add_ext_capab(sdata, skb); 401 402 /* add the QoS element if we support it */ 403 if (local->hw.queues >= IEEE80211_NUM_ACS && 404 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) 405 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */ 406 407 /* add any custom IEs that go before HT capabilities */ 408 if (extra_ies_len) { 409 static const u8 before_ht_cap[] = { 410 WLAN_EID_SUPP_RATES, 411 WLAN_EID_COUNTRY, 412 WLAN_EID_EXT_SUPP_RATES, 413 WLAN_EID_SUPPORTED_CHANNELS, 414 WLAN_EID_RSN, 415 WLAN_EID_EXT_CAPABILITY, 416 WLAN_EID_QOS_CAPA, 417 WLAN_EID_FAST_BSS_TRANSITION, 418 WLAN_EID_TIMEOUT_INTERVAL, 419 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 420 }; 421 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 422 before_ht_cap, 423 ARRAY_SIZE(before_ht_cap), 424 offset); 425 skb_put_data(skb, extra_ies + offset, noffset - offset); 426 offset = noffset; 427 } 428 429 mutex_lock(&local->sta_mtx); 430 431 /* we should have the peer STA if we're already responding */ 432 if (action_code == WLAN_TDLS_SETUP_RESPONSE) { 433 sta = sta_info_get(sdata, peer); 434 if (WARN_ON_ONCE(!sta)) { 435 mutex_unlock(&local->sta_mtx); 436 return; 437 } 438 439 sta->tdls_chandef = sdata->vif.bss_conf.chandef; 440 } 441 442 ieee80211_tdls_add_oper_classes(sdata, skb); 443 444 /* 445 * with TDLS we can switch channels, and HT-caps are not necessarily 446 * the same on all bands. The specification limits the setup to a 447 * single HT-cap, so use the current band for now. 448 */ 449 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 450 451 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 452 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 453 ht_cap.ht_supported) { 454 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 455 456 /* disable SMPS in TDLS initiator */ 457 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED 458 << IEEE80211_HT_CAP_SM_PS_SHIFT; 459 460 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 461 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 462 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 463 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { 464 /* the peer caps are already intersected with our own */ 465 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap)); 466 467 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 468 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 469 } 470 471 if (ht_cap.ht_supported && 472 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 473 ieee80211_tdls_add_bss_coex_ie(skb); 474 475 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 476 477 /* add any custom IEs that go before VHT capabilities */ 478 if (extra_ies_len) { 479 static const u8 before_vht_cap[] = { 480 WLAN_EID_SUPP_RATES, 481 WLAN_EID_COUNTRY, 482 WLAN_EID_EXT_SUPP_RATES, 483 WLAN_EID_SUPPORTED_CHANNELS, 484 WLAN_EID_RSN, 485 WLAN_EID_EXT_CAPABILITY, 486 WLAN_EID_QOS_CAPA, 487 WLAN_EID_FAST_BSS_TRANSITION, 488 WLAN_EID_TIMEOUT_INTERVAL, 489 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 490 WLAN_EID_MULTI_BAND, 491 }; 492 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 493 before_vht_cap, 494 ARRAY_SIZE(before_vht_cap), 495 offset); 496 skb_put_data(skb, extra_ies + offset, noffset - offset); 497 offset = noffset; 498 } 499 500 /* build the VHT-cap similarly to the HT-cap */ 501 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 502 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 503 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 504 vht_cap.vht_supported) { 505 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 506 507 /* the AID is present only when VHT is implemented */ 508 if (action_code == WLAN_TDLS_SETUP_REQUEST) 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 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 514 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) { 515 /* the peer caps are already intersected with our own */ 516 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap)); 517 518 /* the AID is present only when VHT is implemented */ 519 ieee80211_tdls_add_aid(sdata, skb); 520 521 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 522 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 523 524 /* 525 * if both peers support WIDER_BW, we can expand the chandef to 526 * a wider compatible one, up to 80MHz 527 */ 528 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 529 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 530 } 531 532 mutex_unlock(&local->sta_mtx); 533 534 /* add any remaining IEs */ 535 if (extra_ies_len) { 536 noffset = extra_ies_len; 537 skb_put_data(skb, extra_ies + offset, noffset - offset); 538 } 539 540 } 541 542 static void 543 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata, 544 struct sk_buff *skb, const u8 *peer, 545 bool initiator, const u8 *extra_ies, 546 size_t extra_ies_len) 547 { 548 struct ieee80211_local *local = sdata->local; 549 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 550 size_t offset = 0, noffset; 551 struct sta_info *sta, *ap_sta; 552 struct ieee80211_supported_band *sband; 553 u8 *pos; 554 555 sband = ieee80211_get_sband(sdata); 556 if (!sband) 557 return; 558 559 mutex_lock(&local->sta_mtx); 560 561 sta = sta_info_get(sdata, peer); 562 ap_sta = sta_info_get(sdata, ifmgd->bssid); 563 if (WARN_ON_ONCE(!sta || !ap_sta)) { 564 mutex_unlock(&local->sta_mtx); 565 return; 566 } 567 568 sta->tdls_chandef = sdata->vif.bss_conf.chandef; 569 570 /* add any custom IEs that go before the QoS IE */ 571 if (extra_ies_len) { 572 static const u8 before_qos[] = { 573 WLAN_EID_RSN, 574 }; 575 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 576 before_qos, 577 ARRAY_SIZE(before_qos), 578 offset); 579 skb_put_data(skb, extra_ies + offset, noffset - offset); 580 offset = noffset; 581 } 582 583 /* add the QoS param IE if both the peer and we support it */ 584 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme) 585 ieee80211_tdls_add_wmm_param_ie(sdata, skb); 586 587 /* add any custom IEs that go before HT operation */ 588 if (extra_ies_len) { 589 static const u8 before_ht_op[] = { 590 WLAN_EID_RSN, 591 WLAN_EID_QOS_CAPA, 592 WLAN_EID_FAST_BSS_TRANSITION, 593 WLAN_EID_TIMEOUT_INTERVAL, 594 }; 595 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 596 before_ht_op, 597 ARRAY_SIZE(before_ht_op), 598 offset); 599 skb_put_data(skb, extra_ies + offset, noffset - offset); 600 offset = noffset; 601 } 602 603 /* 604 * if HT support is only added in TDLS, we need an HT-operation IE. 605 * add the IE as required by IEEE802.11-2012 9.23.3.2. 606 */ 607 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { 608 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 609 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 610 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 611 612 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 613 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap, 614 &sdata->vif.bss_conf.chandef, prot, 615 true); 616 } 617 618 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 619 620 /* only include VHT-operation if not on the 2.4GHz band */ 621 if (sband->band != NL80211_BAND_2GHZ && 622 sta->sta.vht_cap.vht_supported) { 623 /* 624 * if both peers support WIDER_BW, we can expand the chandef to 625 * a wider compatible one, up to 80MHz 626 */ 627 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 628 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 629 630 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 631 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap, 632 &sta->tdls_chandef); 633 } 634 635 mutex_unlock(&local->sta_mtx); 636 637 /* add any remaining IEs */ 638 if (extra_ies_len) { 639 noffset = extra_ies_len; 640 skb_put_data(skb, extra_ies + offset, noffset - offset); 641 } 642 } 643 644 static void 645 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata, 646 struct sk_buff *skb, const u8 *peer, 647 bool initiator, const u8 *extra_ies, 648 size_t extra_ies_len, u8 oper_class, 649 struct cfg80211_chan_def *chandef) 650 { 651 struct ieee80211_tdls_data *tf; 652 size_t offset = 0, noffset; 653 654 if (WARN_ON_ONCE(!chandef)) 655 return; 656 657 tf = (void *)skb->data; 658 tf->u.chan_switch_req.target_channel = 659 ieee80211_frequency_to_channel(chandef->chan->center_freq); 660 tf->u.chan_switch_req.oper_class = oper_class; 661 662 if (extra_ies_len) { 663 static const u8 before_lnkie[] = { 664 WLAN_EID_SECONDARY_CHANNEL_OFFSET, 665 }; 666 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 667 before_lnkie, 668 ARRAY_SIZE(before_lnkie), 669 offset); 670 skb_put_data(skb, extra_ies + offset, noffset - offset); 671 offset = noffset; 672 } 673 674 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 675 676 /* add any remaining IEs */ 677 if (extra_ies_len) { 678 noffset = extra_ies_len; 679 skb_put_data(skb, extra_ies + offset, noffset - offset); 680 } 681 } 682 683 static void 684 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata, 685 struct sk_buff *skb, const u8 *peer, 686 u16 status_code, bool initiator, 687 const u8 *extra_ies, 688 size_t extra_ies_len) 689 { 690 if (status_code == 0) 691 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 692 693 if (extra_ies_len) 694 skb_put_data(skb, extra_ies, extra_ies_len); 695 } 696 697 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata, 698 struct sk_buff *skb, const u8 *peer, 699 u8 action_code, u16 status_code, 700 bool initiator, const u8 *extra_ies, 701 size_t extra_ies_len, u8 oper_class, 702 struct cfg80211_chan_def *chandef) 703 { 704 switch (action_code) { 705 case WLAN_TDLS_SETUP_REQUEST: 706 case WLAN_TDLS_SETUP_RESPONSE: 707 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 708 if (status_code == 0) 709 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer, 710 action_code, 711 initiator, 712 extra_ies, 713 extra_ies_len); 714 break; 715 case WLAN_TDLS_SETUP_CONFIRM: 716 if (status_code == 0) 717 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer, 718 initiator, extra_ies, 719 extra_ies_len); 720 break; 721 case WLAN_TDLS_TEARDOWN: 722 case WLAN_TDLS_DISCOVERY_REQUEST: 723 if (extra_ies_len) 724 skb_put_data(skb, extra_ies, extra_ies_len); 725 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN) 726 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 727 break; 728 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 729 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer, 730 initiator, extra_ies, 731 extra_ies_len, 732 oper_class, chandef); 733 break; 734 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 735 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer, 736 status_code, 737 initiator, extra_ies, 738 extra_ies_len); 739 break; 740 } 741 742 } 743 744 static int 745 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev, 746 const u8 *peer, u8 action_code, u8 dialog_token, 747 u16 status_code, struct sk_buff *skb) 748 { 749 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 750 struct ieee80211_tdls_data *tf; 751 752 tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u)); 753 754 memcpy(tf->da, peer, ETH_ALEN); 755 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN); 756 tf->ether_type = cpu_to_be16(ETH_P_TDLS); 757 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE; 758 759 /* network header is after the ethernet header */ 760 skb_set_network_header(skb, ETH_HLEN); 761 762 switch (action_code) { 763 case WLAN_TDLS_SETUP_REQUEST: 764 tf->category = WLAN_CATEGORY_TDLS; 765 tf->action_code = WLAN_TDLS_SETUP_REQUEST; 766 767 skb_put(skb, sizeof(tf->u.setup_req)); 768 tf->u.setup_req.dialog_token = dialog_token; 769 tf->u.setup_req.capability = 770 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 771 status_code)); 772 break; 773 case WLAN_TDLS_SETUP_RESPONSE: 774 tf->category = WLAN_CATEGORY_TDLS; 775 tf->action_code = WLAN_TDLS_SETUP_RESPONSE; 776 777 skb_put(skb, sizeof(tf->u.setup_resp)); 778 tf->u.setup_resp.status_code = cpu_to_le16(status_code); 779 tf->u.setup_resp.dialog_token = dialog_token; 780 tf->u.setup_resp.capability = 781 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 782 status_code)); 783 break; 784 case WLAN_TDLS_SETUP_CONFIRM: 785 tf->category = WLAN_CATEGORY_TDLS; 786 tf->action_code = WLAN_TDLS_SETUP_CONFIRM; 787 788 skb_put(skb, sizeof(tf->u.setup_cfm)); 789 tf->u.setup_cfm.status_code = cpu_to_le16(status_code); 790 tf->u.setup_cfm.dialog_token = dialog_token; 791 break; 792 case WLAN_TDLS_TEARDOWN: 793 tf->category = WLAN_CATEGORY_TDLS; 794 tf->action_code = WLAN_TDLS_TEARDOWN; 795 796 skb_put(skb, sizeof(tf->u.teardown)); 797 tf->u.teardown.reason_code = cpu_to_le16(status_code); 798 break; 799 case WLAN_TDLS_DISCOVERY_REQUEST: 800 tf->category = WLAN_CATEGORY_TDLS; 801 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST; 802 803 skb_put(skb, sizeof(tf->u.discover_req)); 804 tf->u.discover_req.dialog_token = dialog_token; 805 break; 806 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 807 tf->category = WLAN_CATEGORY_TDLS; 808 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 809 810 skb_put(skb, sizeof(tf->u.chan_switch_req)); 811 break; 812 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 813 tf->category = WLAN_CATEGORY_TDLS; 814 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 815 816 skb_put(skb, sizeof(tf->u.chan_switch_resp)); 817 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code); 818 break; 819 default: 820 return -EINVAL; 821 } 822 823 return 0; 824 } 825 826 static int 827 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev, 828 const u8 *peer, u8 action_code, u8 dialog_token, 829 u16 status_code, struct sk_buff *skb) 830 { 831 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 832 struct ieee80211_mgmt *mgmt; 833 834 mgmt = skb_put_zero(skb, 24); 835 memcpy(mgmt->da, peer, ETH_ALEN); 836 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 837 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 838 839 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 840 IEEE80211_STYPE_ACTION); 841 842 switch (action_code) { 843 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 844 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp)); 845 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC; 846 mgmt->u.action.u.tdls_discover_resp.action_code = 847 WLAN_PUB_ACTION_TDLS_DISCOVER_RES; 848 mgmt->u.action.u.tdls_discover_resp.dialog_token = 849 dialog_token; 850 mgmt->u.action.u.tdls_discover_resp.capability = 851 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 852 status_code)); 853 break; 854 default: 855 return -EINVAL; 856 } 857 858 return 0; 859 } 860 861 static struct sk_buff * 862 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata, 863 const u8 *peer, u8 action_code, 864 u8 dialog_token, u16 status_code, 865 bool initiator, const u8 *extra_ies, 866 size_t extra_ies_len, u8 oper_class, 867 struct cfg80211_chan_def *chandef) 868 { 869 struct ieee80211_local *local = sdata->local; 870 struct sk_buff *skb; 871 int ret; 872 873 skb = netdev_alloc_skb(sdata->dev, 874 local->hw.extra_tx_headroom + 875 max(sizeof(struct ieee80211_mgmt), 876 sizeof(struct ieee80211_tdls_data)) + 877 50 + /* supported rates */ 878 10 + /* ext capab */ 879 26 + /* max(WMM-info, WMM-param) */ 880 2 + max(sizeof(struct ieee80211_ht_cap), 881 sizeof(struct ieee80211_ht_operation)) + 882 2 + max(sizeof(struct ieee80211_vht_cap), 883 sizeof(struct ieee80211_vht_operation)) + 884 50 + /* supported channels */ 885 3 + /* 40/20 BSS coex */ 886 4 + /* AID */ 887 4 + /* oper classes */ 888 extra_ies_len + 889 sizeof(struct ieee80211_tdls_lnkie)); 890 if (!skb) 891 return NULL; 892 893 skb_reserve(skb, local->hw.extra_tx_headroom); 894 895 switch (action_code) { 896 case WLAN_TDLS_SETUP_REQUEST: 897 case WLAN_TDLS_SETUP_RESPONSE: 898 case WLAN_TDLS_SETUP_CONFIRM: 899 case WLAN_TDLS_TEARDOWN: 900 case WLAN_TDLS_DISCOVERY_REQUEST: 901 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 902 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 903 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy, 904 sdata->dev, peer, 905 action_code, dialog_token, 906 status_code, skb); 907 break; 908 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 909 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev, 910 peer, action_code, 911 dialog_token, status_code, 912 skb); 913 break; 914 default: 915 ret = -ENOTSUPP; 916 break; 917 } 918 919 if (ret < 0) 920 goto fail; 921 922 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code, 923 initiator, extra_ies, extra_ies_len, oper_class, 924 chandef); 925 return skb; 926 927 fail: 928 dev_kfree_skb(skb); 929 return NULL; 930 } 931 932 static int 933 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, 934 const u8 *peer, u8 action_code, u8 dialog_token, 935 u16 status_code, u32 peer_capability, 936 bool initiator, const u8 *extra_ies, 937 size_t extra_ies_len, u8 oper_class, 938 struct cfg80211_chan_def *chandef) 939 { 940 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 941 struct sk_buff *skb = NULL; 942 struct sta_info *sta; 943 u32 flags = 0; 944 int ret = 0; 945 946 rcu_read_lock(); 947 sta = sta_info_get(sdata, peer); 948 949 /* infer the initiator if we can, to support old userspace */ 950 switch (action_code) { 951 case WLAN_TDLS_SETUP_REQUEST: 952 if (sta) { 953 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 954 sta->sta.tdls_initiator = false; 955 } 956 /* fall-through */ 957 case WLAN_TDLS_SETUP_CONFIRM: 958 case WLAN_TDLS_DISCOVERY_REQUEST: 959 initiator = true; 960 break; 961 case WLAN_TDLS_SETUP_RESPONSE: 962 /* 963 * In some testing scenarios, we send a request and response. 964 * Make the last packet sent take effect for the initiator 965 * value. 966 */ 967 if (sta) { 968 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 969 sta->sta.tdls_initiator = true; 970 } 971 /* fall-through */ 972 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 973 initiator = false; 974 break; 975 case WLAN_TDLS_TEARDOWN: 976 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 977 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 978 /* any value is ok */ 979 break; 980 default: 981 ret = -ENOTSUPP; 982 break; 983 } 984 985 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR)) 986 initiator = true; 987 988 rcu_read_unlock(); 989 if (ret < 0) 990 goto fail; 991 992 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code, 993 dialog_token, status_code, 994 initiator, extra_ies, 995 extra_ies_len, oper_class, 996 chandef); 997 if (!skb) { 998 ret = -EINVAL; 999 goto fail; 1000 } 1001 1002 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { 1003 ieee80211_tx_skb(sdata, skb); 1004 return 0; 1005 } 1006 1007 /* 1008 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise 1009 * we should default to AC_VI. 1010 */ 1011 switch (action_code) { 1012 case WLAN_TDLS_SETUP_REQUEST: 1013 case WLAN_TDLS_SETUP_RESPONSE: 1014 skb->priority = 256 + 2; 1015 break; 1016 default: 1017 skb->priority = 256 + 5; 1018 break; 1019 } 1020 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb)); 1021 1022 /* 1023 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress. 1024 * Later, if no ACK is returned from peer, we will re-send the teardown 1025 * packet through the AP. 1026 */ 1027 if ((action_code == WLAN_TDLS_TEARDOWN) && 1028 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 1029 bool try_resend; /* Should we keep skb for possible resend */ 1030 1031 /* If not sending directly to peer - no point in keeping skb */ 1032 rcu_read_lock(); 1033 sta = sta_info_get(sdata, peer); 1034 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1035 rcu_read_unlock(); 1036 1037 spin_lock_bh(&sdata->u.mgd.teardown_lock); 1038 if (try_resend && !sdata->u.mgd.teardown_skb) { 1039 /* Mark it as requiring TX status callback */ 1040 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 1041 IEEE80211_TX_INTFL_MLME_CONN_TX; 1042 1043 /* 1044 * skb is copied since mac80211 will later set 1045 * properties that might not be the same as the AP, 1046 * such as encryption, QoS, addresses, etc. 1047 * 1048 * No problem if skb_copy() fails, so no need to check. 1049 */ 1050 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC); 1051 sdata->u.mgd.orig_teardown_skb = skb; 1052 } 1053 spin_unlock_bh(&sdata->u.mgd.teardown_lock); 1054 } 1055 1056 /* disable bottom halves when entering the Tx path */ 1057 local_bh_disable(); 1058 __ieee80211_subif_start_xmit(skb, dev, flags, 0); 1059 local_bh_enable(); 1060 1061 return ret; 1062 1063 fail: 1064 dev_kfree_skb(skb); 1065 return ret; 1066 } 1067 1068 static int 1069 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, 1070 const u8 *peer, u8 action_code, u8 dialog_token, 1071 u16 status_code, u32 peer_capability, bool initiator, 1072 const u8 *extra_ies, size_t extra_ies_len) 1073 { 1074 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1075 struct ieee80211_local *local = sdata->local; 1076 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode; 1077 int ret; 1078 1079 /* don't support setup with forced SMPS mode that's not off */ 1080 if (smps_mode != IEEE80211_SMPS_AUTOMATIC && 1081 smps_mode != IEEE80211_SMPS_OFF) { 1082 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n", 1083 smps_mode); 1084 return -ENOTSUPP; 1085 } 1086 1087 mutex_lock(&local->mtx); 1088 1089 /* we don't support concurrent TDLS peer setups */ 1090 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && 1091 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1092 ret = -EBUSY; 1093 goto out_unlock; 1094 } 1095 1096 /* 1097 * make sure we have a STA representing the peer so we drop or buffer 1098 * non-TDLS-setup frames to the peer. We can't send other packets 1099 * during setup through the AP path. 1100 * Allow error packets to be sent - sometimes we don't even add a STA 1101 * before failing the setup. 1102 */ 1103 if (status_code == 0) { 1104 rcu_read_lock(); 1105 if (!sta_info_get(sdata, peer)) { 1106 rcu_read_unlock(); 1107 ret = -ENOLINK; 1108 goto out_unlock; 1109 } 1110 rcu_read_unlock(); 1111 } 1112 1113 ieee80211_flush_queues(local, sdata, false); 1114 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); 1115 mutex_unlock(&local->mtx); 1116 1117 /* we cannot take the mutex while preparing the setup packet */ 1118 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1119 dialog_token, status_code, 1120 peer_capability, initiator, 1121 extra_ies, extra_ies_len, 0, 1122 NULL); 1123 if (ret < 0) { 1124 mutex_lock(&local->mtx); 1125 eth_zero_addr(sdata->u.mgd.tdls_peer); 1126 mutex_unlock(&local->mtx); 1127 return ret; 1128 } 1129 1130 ieee80211_queue_delayed_work(&sdata->local->hw, 1131 &sdata->u.mgd.tdls_peer_del_work, 1132 TDLS_PEER_SETUP_TIMEOUT); 1133 return 0; 1134 1135 out_unlock: 1136 mutex_unlock(&local->mtx); 1137 return ret; 1138 } 1139 1140 static int 1141 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, 1142 const u8 *peer, u8 action_code, u8 dialog_token, 1143 u16 status_code, u32 peer_capability, 1144 bool initiator, const u8 *extra_ies, 1145 size_t extra_ies_len) 1146 { 1147 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1148 struct ieee80211_local *local = sdata->local; 1149 struct sta_info *sta; 1150 int ret; 1151 1152 /* 1153 * No packets can be transmitted to the peer via the AP during setup - 1154 * the STA is set as a TDLS peer, but is not authorized. 1155 * During teardown, we prevent direct transmissions by stopping the 1156 * queues and flushing all direct packets. 1157 */ 1158 ieee80211_stop_vif_queues(local, sdata, 1159 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1160 ieee80211_flush_queues(local, sdata, false); 1161 1162 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1163 dialog_token, status_code, 1164 peer_capability, initiator, 1165 extra_ies, extra_ies_len, 0, 1166 NULL); 1167 if (ret < 0) 1168 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", 1169 ret); 1170 1171 /* 1172 * Remove the STA AUTH flag to force further traffic through the AP. If 1173 * the STA was unreachable, it was already removed. 1174 */ 1175 rcu_read_lock(); 1176 sta = sta_info_get(sdata, peer); 1177 if (sta) 1178 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1179 rcu_read_unlock(); 1180 1181 ieee80211_wake_vif_queues(local, sdata, 1182 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1183 1184 return 0; 1185 } 1186 1187 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 1188 const u8 *peer, u8 action_code, u8 dialog_token, 1189 u16 status_code, u32 peer_capability, 1190 bool initiator, const u8 *extra_ies, 1191 size_t extra_ies_len) 1192 { 1193 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1194 int ret; 1195 1196 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1197 return -ENOTSUPP; 1198 1199 /* make sure we are in managed mode, and associated */ 1200 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1201 !sdata->u.mgd.associated) 1202 return -EINVAL; 1203 1204 switch (action_code) { 1205 case WLAN_TDLS_SETUP_REQUEST: 1206 case WLAN_TDLS_SETUP_RESPONSE: 1207 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code, 1208 dialog_token, status_code, 1209 peer_capability, initiator, 1210 extra_ies, extra_ies_len); 1211 break; 1212 case WLAN_TDLS_TEARDOWN: 1213 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, 1214 action_code, dialog_token, 1215 status_code, 1216 peer_capability, initiator, 1217 extra_ies, extra_ies_len); 1218 break; 1219 case WLAN_TDLS_DISCOVERY_REQUEST: 1220 /* 1221 * Protect the discovery so we can hear the TDLS discovery 1222 * response frame. It is transmitted directly and not buffered 1223 * by the AP. 1224 */ 1225 drv_mgd_protect_tdls_discover(sdata->local, sdata); 1226 /* fall-through */ 1227 case WLAN_TDLS_SETUP_CONFIRM: 1228 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1229 /* no special handling */ 1230 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1231 action_code, 1232 dialog_token, 1233 status_code, 1234 peer_capability, 1235 initiator, extra_ies, 1236 extra_ies_len, 0, NULL); 1237 break; 1238 default: 1239 ret = -EOPNOTSUPP; 1240 break; 1241 } 1242 1243 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n", 1244 action_code, peer, ret); 1245 return ret; 1246 } 1247 1248 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata, 1249 struct sta_info *sta) 1250 { 1251 struct ieee80211_local *local = sdata->local; 1252 struct ieee80211_chanctx_conf *conf; 1253 struct ieee80211_chanctx *ctx; 1254 enum nl80211_chan_width width; 1255 struct ieee80211_supported_band *sband; 1256 1257 mutex_lock(&local->chanctx_mtx); 1258 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1259 lockdep_is_held(&local->chanctx_mtx)); 1260 if (conf) { 1261 width = conf->def.width; 1262 sband = local->hw.wiphy->bands[conf->def.chan->band]; 1263 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1264 ieee80211_recalc_chanctx_chantype(local, ctx); 1265 1266 /* if width changed and a peer is given, update its BW */ 1267 if (width != conf->def.width && sta && 1268 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) { 1269 enum ieee80211_sta_rx_bandwidth bw; 1270 1271 bw = ieee80211_chan_width_to_rx_bw(conf->def.width); 1272 bw = min(bw, ieee80211_sta_cap_rx_bw(sta)); 1273 if (bw != sta->sta.bandwidth) { 1274 sta->sta.bandwidth = bw; 1275 rate_control_rate_update(local, sband, sta, 1276 IEEE80211_RC_BW_CHANGED); 1277 /* 1278 * if a TDLS peer BW was updated, we need to 1279 * recalc the chandef width again, to get the 1280 * correct chanctx min_def 1281 */ 1282 ieee80211_recalc_chanctx_chantype(local, ctx); 1283 } 1284 } 1285 1286 } 1287 mutex_unlock(&local->chanctx_mtx); 1288 } 1289 1290 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata) 1291 { 1292 struct sta_info *sta; 1293 bool result = false; 1294 1295 rcu_read_lock(); 1296 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1297 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1298 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 1299 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) || 1300 !sta->sta.ht_cap.ht_supported) 1301 continue; 1302 result = true; 1303 break; 1304 } 1305 rcu_read_unlock(); 1306 1307 return result; 1308 } 1309 1310 static void 1311 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata, 1312 struct sta_info *sta) 1313 { 1314 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1315 bool tdls_ht; 1316 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 1317 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 1318 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 1319 u16 opmode; 1320 1321 /* Nothing to do if the BSS connection uses HT */ 1322 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 1323 return; 1324 1325 tdls_ht = (sta && sta->sta.ht_cap.ht_supported) || 1326 iee80211_tdls_have_ht_peers(sdata); 1327 1328 opmode = sdata->vif.bss_conf.ht_operation_mode; 1329 1330 if (tdls_ht) 1331 opmode |= protection; 1332 else 1333 opmode &= ~protection; 1334 1335 if (opmode == sdata->vif.bss_conf.ht_operation_mode) 1336 return; 1337 1338 sdata->vif.bss_conf.ht_operation_mode = opmode; 1339 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT); 1340 } 1341 1342 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 1343 const u8 *peer, enum nl80211_tdls_operation oper) 1344 { 1345 struct sta_info *sta; 1346 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1347 struct ieee80211_local *local = sdata->local; 1348 int ret; 1349 1350 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1351 return -ENOTSUPP; 1352 1353 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1354 return -EINVAL; 1355 1356 switch (oper) { 1357 case NL80211_TDLS_ENABLE_LINK: 1358 case NL80211_TDLS_DISABLE_LINK: 1359 break; 1360 case NL80211_TDLS_TEARDOWN: 1361 case NL80211_TDLS_SETUP: 1362 case NL80211_TDLS_DISCOVERY_REQ: 1363 /* We don't support in-driver setup/teardown/discovery */ 1364 return -ENOTSUPP; 1365 } 1366 1367 /* protect possible bss_conf changes and avoid concurrency in 1368 * ieee80211_bss_info_change_notify() 1369 */ 1370 sdata_lock(sdata); 1371 mutex_lock(&local->mtx); 1372 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); 1373 1374 switch (oper) { 1375 case NL80211_TDLS_ENABLE_LINK: 1376 if (sdata->vif.csa_active) { 1377 tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); 1378 ret = -EBUSY; 1379 break; 1380 } 1381 1382 mutex_lock(&local->sta_mtx); 1383 sta = sta_info_get(sdata, peer); 1384 if (!sta) { 1385 mutex_unlock(&local->sta_mtx); 1386 ret = -ENOLINK; 1387 break; 1388 } 1389 1390 iee80211_tdls_recalc_chanctx(sdata, sta); 1391 iee80211_tdls_recalc_ht_protection(sdata, sta); 1392 1393 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1394 mutex_unlock(&local->sta_mtx); 1395 1396 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || 1397 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); 1398 ret = 0; 1399 break; 1400 case NL80211_TDLS_DISABLE_LINK: 1401 /* 1402 * The teardown message in ieee80211_tdls_mgmt_teardown() was 1403 * created while the queues were stopped, so it might still be 1404 * pending. Before flushing the queues we need to be sure the 1405 * message is handled by the tasklet handling pending messages, 1406 * otherwise we might start destroying the station before 1407 * sending the teardown packet. 1408 * Note that this only forces the tasklet to flush pendings - 1409 * not to stop the tasklet from rescheduling itself. 1410 */ 1411 tasklet_kill(&local->tx_pending_tasklet); 1412 /* flush a potentially queued teardown packet */ 1413 ieee80211_flush_queues(local, sdata, false); 1414 1415 ret = sta_info_destroy_addr(sdata, peer); 1416 1417 mutex_lock(&local->sta_mtx); 1418 iee80211_tdls_recalc_ht_protection(sdata, NULL); 1419 mutex_unlock(&local->sta_mtx); 1420 1421 iee80211_tdls_recalc_chanctx(sdata, NULL); 1422 break; 1423 default: 1424 ret = -ENOTSUPP; 1425 break; 1426 } 1427 1428 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1429 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work); 1430 eth_zero_addr(sdata->u.mgd.tdls_peer); 1431 } 1432 1433 if (ret == 0) 1434 ieee80211_queue_work(&sdata->local->hw, 1435 &sdata->u.mgd.request_smps_work); 1436 1437 mutex_unlock(&local->mtx); 1438 sdata_unlock(sdata); 1439 return ret; 1440 } 1441 1442 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, 1443 enum nl80211_tdls_operation oper, 1444 u16 reason_code, gfp_t gfp) 1445 { 1446 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1447 1448 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) { 1449 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", 1450 oper); 1451 return; 1452 } 1453 1454 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); 1455 } 1456 EXPORT_SYMBOL(ieee80211_tdls_oper_request); 1457 1458 static void 1459 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) 1460 { 1461 struct ieee80211_ch_switch_timing *ch_sw; 1462 1463 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; 1464 *buf++ = sizeof(struct ieee80211_ch_switch_timing); 1465 1466 ch_sw = (void *)buf; 1467 ch_sw->switch_time = cpu_to_le16(switch_time); 1468 ch_sw->switch_timeout = cpu_to_le16(switch_timeout); 1469 } 1470 1471 /* find switch timing IE in SKB ready for Tx */ 1472 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) 1473 { 1474 struct ieee80211_tdls_data *tf; 1475 const u8 *ie_start; 1476 1477 /* 1478 * Get the offset for the new location of the switch timing IE. 1479 * The SKB network header will now point to the "payload_type" 1480 * element of the TDLS data frame struct. 1481 */ 1482 tf = container_of(skb->data + skb_network_offset(skb), 1483 struct ieee80211_tdls_data, payload_type); 1484 ie_start = tf->u.chan_switch_req.variable; 1485 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, 1486 skb->len - (ie_start - skb->data)); 1487 } 1488 1489 static struct sk_buff * 1490 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, 1491 struct cfg80211_chan_def *chandef, 1492 u32 *ch_sw_tm_ie_offset) 1493 { 1494 struct ieee80211_sub_if_data *sdata = sta->sdata; 1495 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 1496 2 + sizeof(struct ieee80211_ch_switch_timing)]; 1497 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); 1498 u8 *pos = extra_ies; 1499 struct sk_buff *skb; 1500 1501 /* 1502 * if chandef points to a wide channel add a Secondary-Channel 1503 * Offset information element 1504 */ 1505 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1506 struct ieee80211_sec_chan_offs_ie *sec_chan_ie; 1507 bool ht40plus; 1508 1509 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 1510 *pos++ = sizeof(*sec_chan_ie); 1511 sec_chan_ie = (void *)pos; 1512 1513 ht40plus = cfg80211_get_chandef_type(chandef) == 1514 NL80211_CHAN_HT40PLUS; 1515 sec_chan_ie->sec_chan_offs = ht40plus ? 1516 IEEE80211_HT_PARAM_CHA_SEC_ABOVE : 1517 IEEE80211_HT_PARAM_CHA_SEC_BELOW; 1518 pos += sizeof(*sec_chan_ie); 1519 1520 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 1521 } 1522 1523 /* just set the values to 0, this is a template */ 1524 iee80211_tdls_add_ch_switch_timing(pos, 0, 0); 1525 1526 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1527 WLAN_TDLS_CHANNEL_SWITCH_REQUEST, 1528 0, 0, !sta->sta.tdls_initiator, 1529 extra_ies, extra_ies_len, 1530 oper_class, chandef); 1531 if (!skb) 1532 return NULL; 1533 1534 skb = ieee80211_build_data_template(sdata, skb, 0); 1535 if (IS_ERR(skb)) { 1536 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); 1537 return NULL; 1538 } 1539 1540 if (ch_sw_tm_ie_offset) { 1541 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1542 1543 if (!tm_ie) { 1544 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); 1545 dev_kfree_skb_any(skb); 1546 return NULL; 1547 } 1548 1549 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1550 } 1551 1552 tdls_dbg(sdata, 1553 "TDLS channel switch request template for %pM ch %d width %d\n", 1554 sta->sta.addr, chandef->chan->center_freq, chandef->width); 1555 return skb; 1556 } 1557 1558 int 1559 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, 1560 const u8 *addr, u8 oper_class, 1561 struct cfg80211_chan_def *chandef) 1562 { 1563 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1564 struct ieee80211_local *local = sdata->local; 1565 struct sta_info *sta; 1566 struct sk_buff *skb = NULL; 1567 u32 ch_sw_tm_ie; 1568 int ret; 1569 1570 mutex_lock(&local->sta_mtx); 1571 sta = sta_info_get(sdata, addr); 1572 if (!sta) { 1573 tdls_dbg(sdata, 1574 "Invalid TDLS peer %pM for channel switch request\n", 1575 addr); 1576 ret = -ENOENT; 1577 goto out; 1578 } 1579 1580 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { 1581 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", 1582 addr); 1583 ret = -ENOTSUPP; 1584 goto out; 1585 } 1586 1587 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, 1588 &ch_sw_tm_ie); 1589 if (!skb) { 1590 ret = -ENOENT; 1591 goto out; 1592 } 1593 1594 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, 1595 chandef, skb, ch_sw_tm_ie); 1596 if (!ret) 1597 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1598 1599 out: 1600 mutex_unlock(&local->sta_mtx); 1601 dev_kfree_skb_any(skb); 1602 return ret; 1603 } 1604 1605 void 1606 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, 1607 struct net_device *dev, 1608 const u8 *addr) 1609 { 1610 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1611 struct ieee80211_local *local = sdata->local; 1612 struct sta_info *sta; 1613 1614 mutex_lock(&local->sta_mtx); 1615 sta = sta_info_get(sdata, addr); 1616 if (!sta) { 1617 tdls_dbg(sdata, 1618 "Invalid TDLS peer %pM for channel switch cancel\n", 1619 addr); 1620 goto out; 1621 } 1622 1623 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 1624 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", 1625 addr); 1626 goto out; 1627 } 1628 1629 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 1630 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1631 1632 out: 1633 mutex_unlock(&local->sta_mtx); 1634 } 1635 1636 static struct sk_buff * 1637 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, 1638 u32 *ch_sw_tm_ie_offset) 1639 { 1640 struct ieee80211_sub_if_data *sdata = sta->sdata; 1641 struct sk_buff *skb; 1642 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; 1643 1644 /* initial timing are always zero in the template */ 1645 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); 1646 1647 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1648 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, 1649 0, 0, !sta->sta.tdls_initiator, 1650 extra_ies, sizeof(extra_ies), 0, NULL); 1651 if (!skb) 1652 return NULL; 1653 1654 skb = ieee80211_build_data_template(sdata, skb, 0); 1655 if (IS_ERR(skb)) { 1656 tdls_dbg(sdata, 1657 "Failed building TDLS channel switch resp frame\n"); 1658 return NULL; 1659 } 1660 1661 if (ch_sw_tm_ie_offset) { 1662 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1663 1664 if (!tm_ie) { 1665 tdls_dbg(sdata, 1666 "No switch timing IE in TDLS switch resp\n"); 1667 dev_kfree_skb_any(skb); 1668 return NULL; 1669 } 1670 1671 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1672 } 1673 1674 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", 1675 sta->sta.addr); 1676 return skb; 1677 } 1678 1679 static int 1680 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, 1681 struct sk_buff *skb) 1682 { 1683 struct ieee80211_local *local = sdata->local; 1684 struct ieee802_11_elems elems; 1685 struct sta_info *sta; 1686 struct ieee80211_tdls_data *tf = (void *)skb->data; 1687 bool local_initiator; 1688 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1689 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); 1690 struct ieee80211_tdls_ch_sw_params params = {}; 1691 int ret; 1692 1693 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 1694 params.timestamp = rx_status->device_timestamp; 1695 1696 if (skb->len < baselen) { 1697 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", 1698 skb->len); 1699 return -EINVAL; 1700 } 1701 1702 mutex_lock(&local->sta_mtx); 1703 sta = sta_info_get(sdata, tf->sa); 1704 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1705 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1706 tf->sa); 1707 ret = -EINVAL; 1708 goto out; 1709 } 1710 1711 params.sta = &sta->sta; 1712 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); 1713 if (params.status != 0) { 1714 ret = 0; 1715 goto call_drv; 1716 } 1717 1718 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, 1719 skb->len - baselen, false, &elems, 1720 NULL, NULL); 1721 if (elems.parse_error) { 1722 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); 1723 ret = -EINVAL; 1724 goto out; 1725 } 1726 1727 if (!elems.ch_sw_timing || !elems.lnk_id) { 1728 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); 1729 ret = -EINVAL; 1730 goto out; 1731 } 1732 1733 /* validate the initiator is set correctly */ 1734 local_initiator = 1735 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1736 if (local_initiator == sta->sta.tdls_initiator) { 1737 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1738 ret = -EINVAL; 1739 goto out; 1740 } 1741 1742 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); 1743 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); 1744 1745 params.tmpl_skb = 1746 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); 1747 if (!params.tmpl_skb) { 1748 ret = -ENOENT; 1749 goto out; 1750 } 1751 1752 ret = 0; 1753 call_drv: 1754 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1755 1756 tdls_dbg(sdata, 1757 "TDLS channel switch response received from %pM status %d\n", 1758 tf->sa, params.status); 1759 1760 out: 1761 mutex_unlock(&local->sta_mtx); 1762 dev_kfree_skb_any(params.tmpl_skb); 1763 return ret; 1764 } 1765 1766 static int 1767 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, 1768 struct sk_buff *skb) 1769 { 1770 struct ieee80211_local *local = sdata->local; 1771 struct ieee802_11_elems elems; 1772 struct cfg80211_chan_def chandef; 1773 struct ieee80211_channel *chan; 1774 enum nl80211_channel_type chan_type; 1775 int freq; 1776 u8 target_channel, oper_class; 1777 bool local_initiator; 1778 struct sta_info *sta; 1779 enum nl80211_band band; 1780 struct ieee80211_tdls_data *tf = (void *)skb->data; 1781 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1782 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); 1783 struct ieee80211_tdls_ch_sw_params params = {}; 1784 int ret = 0; 1785 1786 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 1787 params.timestamp = rx_status->device_timestamp; 1788 1789 if (skb->len < baselen) { 1790 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", 1791 skb->len); 1792 return -EINVAL; 1793 } 1794 1795 target_channel = tf->u.chan_switch_req.target_channel; 1796 oper_class = tf->u.chan_switch_req.oper_class; 1797 1798 /* 1799 * We can't easily infer the channel band. The operating class is 1800 * ambiguous - there are multiple tables (US/Europe/JP/Global). The 1801 * solution here is to treat channels with number >14 as 5GHz ones, 1802 * and specifically check for the (oper_class, channel) combinations 1803 * where this doesn't hold. These are thankfully unique according to 1804 * IEEE802.11-2012. 1805 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as 1806 * valid here. 1807 */ 1808 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || 1809 oper_class == 4 || oper_class == 5 || oper_class == 6) && 1810 target_channel < 14) 1811 band = NL80211_BAND_5GHZ; 1812 else 1813 band = target_channel < 14 ? NL80211_BAND_2GHZ : 1814 NL80211_BAND_5GHZ; 1815 1816 freq = ieee80211_channel_to_frequency(target_channel, band); 1817 if (freq == 0) { 1818 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", 1819 target_channel); 1820 return -EINVAL; 1821 } 1822 1823 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 1824 if (!chan) { 1825 tdls_dbg(sdata, 1826 "Unsupported channel for TDLS chan switch: %d\n", 1827 target_channel); 1828 return -EINVAL; 1829 } 1830 1831 ieee802_11_parse_elems(tf->u.chan_switch_req.variable, 1832 skb->len - baselen, false, &elems, NULL, NULL); 1833 if (elems.parse_error) { 1834 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); 1835 return -EINVAL; 1836 } 1837 1838 if (!elems.ch_sw_timing || !elems.lnk_id) { 1839 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); 1840 return -EINVAL; 1841 } 1842 1843 if (!elems.sec_chan_offs) { 1844 chan_type = NL80211_CHAN_HT20; 1845 } else { 1846 switch (elems.sec_chan_offs->sec_chan_offs) { 1847 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 1848 chan_type = NL80211_CHAN_HT40PLUS; 1849 break; 1850 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 1851 chan_type = NL80211_CHAN_HT40MINUS; 1852 break; 1853 default: 1854 chan_type = NL80211_CHAN_HT20; 1855 break; 1856 } 1857 } 1858 1859 cfg80211_chandef_create(&chandef, chan, chan_type); 1860 1861 /* we will be active on the TDLS link */ 1862 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, 1863 sdata->wdev.iftype)) { 1864 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); 1865 return -EINVAL; 1866 } 1867 1868 mutex_lock(&local->sta_mtx); 1869 sta = sta_info_get(sdata, tf->sa); 1870 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1871 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1872 tf->sa); 1873 ret = -EINVAL; 1874 goto out; 1875 } 1876 1877 params.sta = &sta->sta; 1878 1879 /* validate the initiator is set correctly */ 1880 local_initiator = 1881 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1882 if (local_initiator == sta->sta.tdls_initiator) { 1883 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1884 ret = -EINVAL; 1885 goto out; 1886 } 1887 1888 /* peer should have known better */ 1889 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs && 1890 elems.sec_chan_offs->sec_chan_offs) { 1891 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); 1892 ret = -ENOTSUPP; 1893 goto out; 1894 } 1895 1896 params.chandef = &chandef; 1897 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); 1898 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); 1899 1900 params.tmpl_skb = 1901 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, 1902 ¶ms.ch_sw_tm_ie); 1903 if (!params.tmpl_skb) { 1904 ret = -ENOENT; 1905 goto out; 1906 } 1907 1908 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1909 1910 tdls_dbg(sdata, 1911 "TDLS ch switch request received from %pM ch %d width %d\n", 1912 tf->sa, params.chandef->chan->center_freq, 1913 params.chandef->width); 1914 out: 1915 mutex_unlock(&local->sta_mtx); 1916 dev_kfree_skb_any(params.tmpl_skb); 1917 return ret; 1918 } 1919 1920 static void 1921 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, 1922 struct sk_buff *skb) 1923 { 1924 struct ieee80211_tdls_data *tf = (void *)skb->data; 1925 struct wiphy *wiphy = sdata->local->hw.wiphy; 1926 1927 ASSERT_RTNL(); 1928 1929 /* make sure the driver supports it */ 1930 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) 1931 return; 1932 1933 /* we want to access the entire packet */ 1934 if (skb_linearize(skb)) 1935 return; 1936 /* 1937 * The packet/size was already validated by mac80211 Rx path, only look 1938 * at the action type. 1939 */ 1940 switch (tf->action_code) { 1941 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 1942 ieee80211_process_tdls_channel_switch_req(sdata, skb); 1943 break; 1944 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 1945 ieee80211_process_tdls_channel_switch_resp(sdata, skb); 1946 break; 1947 default: 1948 WARN_ON_ONCE(1); 1949 return; 1950 } 1951 } 1952 1953 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata) 1954 { 1955 struct sta_info *sta; 1956 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 1957 1958 rcu_read_lock(); 1959 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1960 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1961 !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 1962 continue; 1963 1964 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, 1965 NL80211_TDLS_TEARDOWN, reason, 1966 GFP_ATOMIC); 1967 } 1968 rcu_read_unlock(); 1969 } 1970 1971 void ieee80211_tdls_chsw_work(struct work_struct *wk) 1972 { 1973 struct ieee80211_local *local = 1974 container_of(wk, struct ieee80211_local, tdls_chsw_work); 1975 struct ieee80211_sub_if_data *sdata; 1976 struct sk_buff *skb; 1977 struct ieee80211_tdls_data *tf; 1978 1979 rtnl_lock(); 1980 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) { 1981 tf = (struct ieee80211_tdls_data *)skb->data; 1982 list_for_each_entry(sdata, &local->interfaces, list) { 1983 if (!ieee80211_sdata_running(sdata) || 1984 sdata->vif.type != NL80211_IFTYPE_STATION || 1985 !ether_addr_equal(tf->da, sdata->vif.addr)) 1986 continue; 1987 1988 ieee80211_process_tdls_channel_switch(sdata, skb); 1989 break; 1990 } 1991 1992 kfree_skb(skb); 1993 } 1994 rtnl_unlock(); 1995 } 1996 1997 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata, 1998 const u8 *peer, u16 reason) 1999 { 2000 struct ieee80211_sta *sta; 2001 2002 rcu_read_lock(); 2003 sta = ieee80211_find_sta(&sdata->vif, peer); 2004 if (!sta || !sta->tdls) { 2005 rcu_read_unlock(); 2006 return; 2007 } 2008 rcu_read_unlock(); 2009 2010 tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n", 2011 peer, reason, 2012 ieee80211_get_reason_code_string(reason)); 2013 2014 ieee80211_tdls_oper_request(&sdata->vif, peer, 2015 NL80211_TDLS_TEARDOWN, 2016 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE, 2017 GFP_ATOMIC); 2018 } 2019