1 /* 2 * mac80211 TDLS handling code 3 * 4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 5 * Copyright 2014, Intel Corporation 6 * Copyright 2014 Intel Mobile Communications GmbH 7 * Copyright 2015 - 2016 Intel Deutschland GmbH 8 * Copyright (C) 2019 Intel Corporation 9 * 10 * This file is GPLv2 as found in COPYING. 11 */ 12 13 #include <linux/ieee80211.h> 14 #include <linux/log2.h> 15 #include <net/cfg80211.h> 16 #include <linux/rtnetlink.h> 17 #include "ieee80211_i.h" 18 #include "driver-ops.h" 19 #include "rate.h" 20 #include "wme.h" 21 22 /* give usermode some time for retries in setting up the TDLS session */ 23 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ) 24 25 void ieee80211_tdls_peer_del_work(struct work_struct *wk) 26 { 27 struct ieee80211_sub_if_data *sdata; 28 struct ieee80211_local *local; 29 30 sdata = container_of(wk, struct ieee80211_sub_if_data, 31 u.mgd.tdls_peer_del_work.work); 32 local = sdata->local; 33 34 mutex_lock(&local->mtx); 35 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) { 36 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer); 37 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer); 38 eth_zero_addr(sdata->u.mgd.tdls_peer); 39 } 40 mutex_unlock(&local->mtx); 41 } 42 43 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata, 44 struct sk_buff *skb) 45 { 46 struct ieee80211_local *local = sdata->local; 47 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 48 bool chan_switch = local->hw.wiphy->features & 49 NL80211_FEATURE_TDLS_CHANNEL_SWITCH; 50 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) && 51 !ifmgd->tdls_wider_bw_prohibited; 52 bool buffer_sta = ieee80211_hw_check(&local->hw, 53 SUPPORTS_TDLS_BUFFER_STA); 54 struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata); 55 bool vht = sband && sband->vht_cap.vht_supported; 56 u8 *pos = skb_put(skb, 10); 57 58 *pos++ = WLAN_EID_EXT_CAPABILITY; 59 *pos++ = 8; /* len */ 60 *pos++ = 0x0; 61 *pos++ = 0x0; 62 *pos++ = 0x0; 63 *pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) | 64 (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0); 65 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED; 66 *pos++ = 0; 67 *pos++ = 0; 68 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0; 69 } 70 71 static u8 72 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata, 73 struct sk_buff *skb, u16 start, u16 end, 74 u16 spacing) 75 { 76 u8 subband_cnt = 0, ch_cnt = 0; 77 struct ieee80211_channel *ch; 78 struct cfg80211_chan_def chandef; 79 int i, subband_start; 80 struct wiphy *wiphy = sdata->local->hw.wiphy; 81 82 for (i = start; i <= end; i += spacing) { 83 if (!ch_cnt) 84 subband_start = i; 85 86 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i); 87 if (ch) { 88 /* we will be active on the channel */ 89 cfg80211_chandef_create(&chandef, ch, 90 NL80211_CHAN_NO_HT); 91 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef, 92 sdata->wdev.iftype)) { 93 ch_cnt++; 94 /* 95 * check if the next channel is also part of 96 * this allowed range 97 */ 98 continue; 99 } 100 } 101 102 /* 103 * we've reached the end of a range, with allowed channels 104 * found 105 */ 106 if (ch_cnt) { 107 u8 *pos = skb_put(skb, 2); 108 *pos++ = ieee80211_frequency_to_channel(subband_start); 109 *pos++ = ch_cnt; 110 111 subband_cnt++; 112 ch_cnt = 0; 113 } 114 } 115 116 /* all channels in the requested range are allowed - add them here */ 117 if (ch_cnt) { 118 u8 *pos = skb_put(skb, 2); 119 *pos++ = ieee80211_frequency_to_channel(subband_start); 120 *pos++ = ch_cnt; 121 122 subband_cnt++; 123 } 124 125 return subband_cnt; 126 } 127 128 static void 129 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata, 130 struct sk_buff *skb) 131 { 132 /* 133 * Add possible channels for TDLS. These are channels that are allowed 134 * to be active. 135 */ 136 u8 subband_cnt; 137 u8 *pos = skb_put(skb, 2); 138 139 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 140 141 /* 142 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as 143 * this doesn't happen in real world scenarios. 144 */ 145 146 /* 2GHz, with 5MHz spacing */ 147 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5); 148 149 /* 5GHz, with 20MHz spacing */ 150 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20); 151 152 /* length */ 153 *pos = 2 * subband_cnt; 154 } 155 156 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata, 157 struct sk_buff *skb) 158 { 159 u8 *pos; 160 u8 op_class; 161 162 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef, 163 &op_class)) 164 return; 165 166 pos = skb_put(skb, 4); 167 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES; 168 *pos++ = 2; /* len */ 169 170 *pos++ = op_class; 171 *pos++ = op_class; /* give current operating class as alternate too */ 172 } 173 174 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb) 175 { 176 u8 *pos = skb_put(skb, 3); 177 178 *pos++ = WLAN_EID_BSS_COEX_2040; 179 *pos++ = 1; /* len */ 180 181 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST; 182 } 183 184 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata, 185 u16 status_code) 186 { 187 struct ieee80211_supported_band *sband; 188 189 /* The capability will be 0 when sending a failure code */ 190 if (status_code != 0) 191 return 0; 192 193 sband = ieee80211_get_sband(sdata); 194 if (sband && sband->band == NL80211_BAND_2GHZ) { 195 return WLAN_CAPABILITY_SHORT_SLOT_TIME | 196 WLAN_CAPABILITY_SHORT_PREAMBLE; 197 } 198 199 return 0; 200 } 201 202 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata, 203 struct sk_buff *skb, const u8 *peer, 204 bool initiator) 205 { 206 struct ieee80211_tdls_lnkie *lnkid; 207 const u8 *init_addr, *rsp_addr; 208 209 if (initiator) { 210 init_addr = sdata->vif.addr; 211 rsp_addr = peer; 212 } else { 213 init_addr = peer; 214 rsp_addr = sdata->vif.addr; 215 } 216 217 lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie)); 218 219 lnkid->ie_type = WLAN_EID_LINK_ID; 220 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2; 221 222 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN); 223 memcpy(lnkid->init_sta, init_addr, ETH_ALEN); 224 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN); 225 } 226 227 static void 228 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 229 { 230 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 231 u8 *pos = skb_put(skb, 4); 232 233 *pos++ = WLAN_EID_AID; 234 *pos++ = 2; /* len */ 235 put_unaligned_le16(ifmgd->aid, pos); 236 } 237 238 /* translate numbering in the WMM parameter IE to the mac80211 notation */ 239 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac) 240 { 241 switch (ac) { 242 default: 243 WARN_ON_ONCE(1); 244 /* fall through */ 245 case 0: 246 return IEEE80211_AC_BE; 247 case 1: 248 return IEEE80211_AC_BK; 249 case 2: 250 return IEEE80211_AC_VI; 251 case 3: 252 return IEEE80211_AC_VO; 253 } 254 } 255 256 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci) 257 { 258 u8 ret; 259 260 ret = aifsn & 0x0f; 261 if (acm) 262 ret |= 0x10; 263 ret |= (aci << 5) & 0x60; 264 return ret; 265 } 266 267 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max) 268 { 269 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) | 270 ((ilog2(cw_max + 1) << 0x4) & 0xf0); 271 } 272 273 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata, 274 struct sk_buff *skb) 275 { 276 struct ieee80211_wmm_param_ie *wmm; 277 struct ieee80211_tx_queue_params *txq; 278 int i; 279 280 wmm = skb_put_zero(skb, sizeof(*wmm)); 281 282 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC; 283 wmm->len = sizeof(*wmm) - 2; 284 285 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */ 286 wmm->oui[1] = 0x50; 287 wmm->oui[2] = 0xf2; 288 wmm->oui_type = 2; /* WME */ 289 wmm->oui_subtype = 1; /* WME param */ 290 wmm->version = 1; /* WME ver */ 291 wmm->qos_info = 0; /* U-APSD not in use */ 292 293 /* 294 * Use the EDCA parameters defined for the BSS, or default if the AP 295 * doesn't support it, as mandated by 802.11-2012 section 10.22.4 296 */ 297 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 298 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)]; 299 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs, 300 txq->acm, i); 301 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max); 302 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop); 303 } 304 } 305 306 static void 307 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata, 308 struct sta_info *sta) 309 { 310 /* IEEE802.11ac-2013 Table E-4 */ 311 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 }; 312 struct cfg80211_chan_def uc = sta->tdls_chandef; 313 enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta); 314 int i; 315 316 /* only support upgrading non-narrow channels up to 80Mhz */ 317 if (max_width == NL80211_CHAN_WIDTH_5 || 318 max_width == NL80211_CHAN_WIDTH_10) 319 return; 320 321 if (max_width > NL80211_CHAN_WIDTH_80) 322 max_width = NL80211_CHAN_WIDTH_80; 323 324 if (uc.width >= max_width) 325 return; 326 /* 327 * Channel usage constrains in the IEEE802.11ac-2013 specification only 328 * allow expanding a 20MHz channel to 80MHz in a single way. In 329 * addition, there are no 40MHz allowed channels that are not part of 330 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here). 331 */ 332 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++) 333 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) { 334 uc.center_freq1 = centers_80mhz[i]; 335 uc.center_freq2 = 0; 336 uc.width = NL80211_CHAN_WIDTH_80; 337 break; 338 } 339 340 if (!uc.center_freq1) 341 return; 342 343 /* proceed to downgrade the chandef until usable or the same as AP BW */ 344 while (uc.width > max_width || 345 (uc.width > sta->tdls_chandef.width && 346 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc, 347 sdata->wdev.iftype))) 348 ieee80211_chandef_downgrade(&uc); 349 350 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) { 351 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n", 352 sta->tdls_chandef.width, uc.width); 353 354 /* 355 * the station is not yet authorized when BW upgrade is done, 356 * locking is not required 357 */ 358 sta->tdls_chandef = uc; 359 } 360 } 361 362 static void 363 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata, 364 struct sk_buff *skb, const u8 *peer, 365 u8 action_code, bool initiator, 366 const u8 *extra_ies, size_t extra_ies_len) 367 { 368 struct ieee80211_supported_band *sband; 369 struct ieee80211_local *local = sdata->local; 370 struct ieee80211_sta_ht_cap ht_cap; 371 struct ieee80211_sta_vht_cap vht_cap; 372 struct sta_info *sta = NULL; 373 size_t offset = 0, noffset; 374 u8 *pos; 375 376 sband = ieee80211_get_sband(sdata); 377 if (!sband) 378 return; 379 380 ieee80211_add_srates_ie(sdata, skb, false, sband->band); 381 ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band); 382 ieee80211_tdls_add_supp_channels(sdata, skb); 383 384 /* add any custom IEs that go before Extended Capabilities */ 385 if (extra_ies_len) { 386 static const u8 before_ext_cap[] = { 387 WLAN_EID_SUPP_RATES, 388 WLAN_EID_COUNTRY, 389 WLAN_EID_EXT_SUPP_RATES, 390 WLAN_EID_SUPPORTED_CHANNELS, 391 WLAN_EID_RSN, 392 }; 393 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 394 before_ext_cap, 395 ARRAY_SIZE(before_ext_cap), 396 offset); 397 skb_put_data(skb, extra_ies + offset, noffset - offset); 398 offset = noffset; 399 } 400 401 ieee80211_tdls_add_ext_capab(sdata, skb); 402 403 /* add the QoS element if we support it */ 404 if (local->hw.queues >= IEEE80211_NUM_ACS && 405 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) 406 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */ 407 408 /* add any custom IEs that go before HT capabilities */ 409 if (extra_ies_len) { 410 static const u8 before_ht_cap[] = { 411 WLAN_EID_SUPP_RATES, 412 WLAN_EID_COUNTRY, 413 WLAN_EID_EXT_SUPP_RATES, 414 WLAN_EID_SUPPORTED_CHANNELS, 415 WLAN_EID_RSN, 416 WLAN_EID_EXT_CAPABILITY, 417 WLAN_EID_QOS_CAPA, 418 WLAN_EID_FAST_BSS_TRANSITION, 419 WLAN_EID_TIMEOUT_INTERVAL, 420 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 421 }; 422 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 423 before_ht_cap, 424 ARRAY_SIZE(before_ht_cap), 425 offset); 426 skb_put_data(skb, extra_ies + offset, noffset - offset); 427 offset = noffset; 428 } 429 430 mutex_lock(&local->sta_mtx); 431 432 /* we should have the peer STA if we're already responding */ 433 if (action_code == WLAN_TDLS_SETUP_RESPONSE) { 434 sta = sta_info_get(sdata, peer); 435 if (WARN_ON_ONCE(!sta)) { 436 mutex_unlock(&local->sta_mtx); 437 return; 438 } 439 440 sta->tdls_chandef = sdata->vif.bss_conf.chandef; 441 } 442 443 ieee80211_tdls_add_oper_classes(sdata, skb); 444 445 /* 446 * with TDLS we can switch channels, and HT-caps are not necessarily 447 * the same on all bands. The specification limits the setup to a 448 * single HT-cap, so use the current band for now. 449 */ 450 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 451 452 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 453 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 454 ht_cap.ht_supported) { 455 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 456 457 /* disable SMPS in TDLS initiator */ 458 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED 459 << IEEE80211_HT_CAP_SM_PS_SHIFT; 460 461 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 462 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 463 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 464 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { 465 /* the peer caps are already intersected with our own */ 466 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap)); 467 468 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 469 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 470 } 471 472 if (ht_cap.ht_supported && 473 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 474 ieee80211_tdls_add_bss_coex_ie(skb); 475 476 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 477 478 /* add any custom IEs that go before VHT capabilities */ 479 if (extra_ies_len) { 480 static const u8 before_vht_cap[] = { 481 WLAN_EID_SUPP_RATES, 482 WLAN_EID_COUNTRY, 483 WLAN_EID_EXT_SUPP_RATES, 484 WLAN_EID_SUPPORTED_CHANNELS, 485 WLAN_EID_RSN, 486 WLAN_EID_EXT_CAPABILITY, 487 WLAN_EID_QOS_CAPA, 488 WLAN_EID_FAST_BSS_TRANSITION, 489 WLAN_EID_TIMEOUT_INTERVAL, 490 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 491 WLAN_EID_MULTI_BAND, 492 }; 493 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 494 before_vht_cap, 495 ARRAY_SIZE(before_vht_cap), 496 offset); 497 skb_put_data(skb, extra_ies + offset, noffset - offset); 498 offset = noffset; 499 } 500 501 /* build the VHT-cap similarly to the HT-cap */ 502 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 503 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 504 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 505 vht_cap.vht_supported) { 506 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 507 508 /* the AID is present only when VHT is implemented */ 509 if (action_code == WLAN_TDLS_SETUP_REQUEST) 510 ieee80211_tdls_add_aid(sdata, skb); 511 512 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 513 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 514 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 515 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) { 516 /* the peer caps are already intersected with our own */ 517 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap)); 518 519 /* the AID is present only when VHT is implemented */ 520 ieee80211_tdls_add_aid(sdata, skb); 521 522 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 523 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 524 525 /* 526 * if both peers support WIDER_BW, we can expand the chandef to 527 * a wider compatible one, up to 80MHz 528 */ 529 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 530 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 531 } 532 533 mutex_unlock(&local->sta_mtx); 534 535 /* add any remaining IEs */ 536 if (extra_ies_len) { 537 noffset = extra_ies_len; 538 skb_put_data(skb, extra_ies + offset, noffset - offset); 539 } 540 541 } 542 543 static void 544 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata, 545 struct sk_buff *skb, const u8 *peer, 546 bool initiator, const u8 *extra_ies, 547 size_t extra_ies_len) 548 { 549 struct ieee80211_local *local = sdata->local; 550 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 551 size_t offset = 0, noffset; 552 struct sta_info *sta, *ap_sta; 553 struct ieee80211_supported_band *sband; 554 u8 *pos; 555 556 sband = ieee80211_get_sband(sdata); 557 if (!sband) 558 return; 559 560 mutex_lock(&local->sta_mtx); 561 562 sta = sta_info_get(sdata, peer); 563 ap_sta = sta_info_get(sdata, ifmgd->bssid); 564 if (WARN_ON_ONCE(!sta || !ap_sta)) { 565 mutex_unlock(&local->sta_mtx); 566 return; 567 } 568 569 sta->tdls_chandef = sdata->vif.bss_conf.chandef; 570 571 /* add any custom IEs that go before the QoS IE */ 572 if (extra_ies_len) { 573 static const u8 before_qos[] = { 574 WLAN_EID_RSN, 575 }; 576 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 577 before_qos, 578 ARRAY_SIZE(before_qos), 579 offset); 580 skb_put_data(skb, extra_ies + offset, noffset - offset); 581 offset = noffset; 582 } 583 584 /* add the QoS param IE if both the peer and we support it */ 585 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme) 586 ieee80211_tdls_add_wmm_param_ie(sdata, skb); 587 588 /* add any custom IEs that go before HT operation */ 589 if (extra_ies_len) { 590 static const u8 before_ht_op[] = { 591 WLAN_EID_RSN, 592 WLAN_EID_QOS_CAPA, 593 WLAN_EID_FAST_BSS_TRANSITION, 594 WLAN_EID_TIMEOUT_INTERVAL, 595 }; 596 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 597 before_ht_op, 598 ARRAY_SIZE(before_ht_op), 599 offset); 600 skb_put_data(skb, extra_ies + offset, noffset - offset); 601 offset = noffset; 602 } 603 604 /* 605 * if HT support is only added in TDLS, we need an HT-operation IE. 606 * add the IE as required by IEEE802.11-2012 9.23.3.2. 607 */ 608 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { 609 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 610 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 611 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 612 613 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 614 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap, 615 &sdata->vif.bss_conf.chandef, prot, 616 true); 617 } 618 619 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 620 621 /* only include VHT-operation if not on the 2.4GHz band */ 622 if (sband->band != NL80211_BAND_2GHZ && 623 sta->sta.vht_cap.vht_supported) { 624 /* 625 * if both peers support WIDER_BW, we can expand the chandef to 626 * a wider compatible one, up to 80MHz 627 */ 628 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 629 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 630 631 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 632 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap, 633 &sta->tdls_chandef); 634 } 635 636 mutex_unlock(&local->sta_mtx); 637 638 /* add any remaining IEs */ 639 if (extra_ies_len) { 640 noffset = extra_ies_len; 641 skb_put_data(skb, extra_ies + offset, noffset - offset); 642 } 643 } 644 645 static void 646 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata, 647 struct sk_buff *skb, const u8 *peer, 648 bool initiator, const u8 *extra_ies, 649 size_t extra_ies_len, u8 oper_class, 650 struct cfg80211_chan_def *chandef) 651 { 652 struct ieee80211_tdls_data *tf; 653 size_t offset = 0, noffset; 654 655 if (WARN_ON_ONCE(!chandef)) 656 return; 657 658 tf = (void *)skb->data; 659 tf->u.chan_switch_req.target_channel = 660 ieee80211_frequency_to_channel(chandef->chan->center_freq); 661 tf->u.chan_switch_req.oper_class = oper_class; 662 663 if (extra_ies_len) { 664 static const u8 before_lnkie[] = { 665 WLAN_EID_SECONDARY_CHANNEL_OFFSET, 666 }; 667 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 668 before_lnkie, 669 ARRAY_SIZE(before_lnkie), 670 offset); 671 skb_put_data(skb, extra_ies + offset, noffset - offset); 672 offset = noffset; 673 } 674 675 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 676 677 /* add any remaining IEs */ 678 if (extra_ies_len) { 679 noffset = extra_ies_len; 680 skb_put_data(skb, extra_ies + offset, noffset - offset); 681 } 682 } 683 684 static void 685 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata, 686 struct sk_buff *skb, const u8 *peer, 687 u16 status_code, bool initiator, 688 const u8 *extra_ies, 689 size_t extra_ies_len) 690 { 691 if (status_code == 0) 692 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 693 694 if (extra_ies_len) 695 skb_put_data(skb, extra_ies, extra_ies_len); 696 } 697 698 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata, 699 struct sk_buff *skb, const u8 *peer, 700 u8 action_code, u16 status_code, 701 bool initiator, const u8 *extra_ies, 702 size_t extra_ies_len, u8 oper_class, 703 struct cfg80211_chan_def *chandef) 704 { 705 switch (action_code) { 706 case WLAN_TDLS_SETUP_REQUEST: 707 case WLAN_TDLS_SETUP_RESPONSE: 708 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 709 if (status_code == 0) 710 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer, 711 action_code, 712 initiator, 713 extra_ies, 714 extra_ies_len); 715 break; 716 case WLAN_TDLS_SETUP_CONFIRM: 717 if (status_code == 0) 718 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer, 719 initiator, extra_ies, 720 extra_ies_len); 721 break; 722 case WLAN_TDLS_TEARDOWN: 723 case WLAN_TDLS_DISCOVERY_REQUEST: 724 if (extra_ies_len) 725 skb_put_data(skb, extra_ies, extra_ies_len); 726 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN) 727 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 728 break; 729 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 730 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer, 731 initiator, extra_ies, 732 extra_ies_len, 733 oper_class, chandef); 734 break; 735 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 736 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer, 737 status_code, 738 initiator, extra_ies, 739 extra_ies_len); 740 break; 741 } 742 743 } 744 745 static int 746 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev, 747 const u8 *peer, u8 action_code, u8 dialog_token, 748 u16 status_code, struct sk_buff *skb) 749 { 750 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 751 struct ieee80211_tdls_data *tf; 752 753 tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u)); 754 755 memcpy(tf->da, peer, ETH_ALEN); 756 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN); 757 tf->ether_type = cpu_to_be16(ETH_P_TDLS); 758 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE; 759 760 /* network header is after the ethernet header */ 761 skb_set_network_header(skb, ETH_HLEN); 762 763 switch (action_code) { 764 case WLAN_TDLS_SETUP_REQUEST: 765 tf->category = WLAN_CATEGORY_TDLS; 766 tf->action_code = WLAN_TDLS_SETUP_REQUEST; 767 768 skb_put(skb, sizeof(tf->u.setup_req)); 769 tf->u.setup_req.dialog_token = dialog_token; 770 tf->u.setup_req.capability = 771 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 772 status_code)); 773 break; 774 case WLAN_TDLS_SETUP_RESPONSE: 775 tf->category = WLAN_CATEGORY_TDLS; 776 tf->action_code = WLAN_TDLS_SETUP_RESPONSE; 777 778 skb_put(skb, sizeof(tf->u.setup_resp)); 779 tf->u.setup_resp.status_code = cpu_to_le16(status_code); 780 tf->u.setup_resp.dialog_token = dialog_token; 781 tf->u.setup_resp.capability = 782 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 783 status_code)); 784 break; 785 case WLAN_TDLS_SETUP_CONFIRM: 786 tf->category = WLAN_CATEGORY_TDLS; 787 tf->action_code = WLAN_TDLS_SETUP_CONFIRM; 788 789 skb_put(skb, sizeof(tf->u.setup_cfm)); 790 tf->u.setup_cfm.status_code = cpu_to_le16(status_code); 791 tf->u.setup_cfm.dialog_token = dialog_token; 792 break; 793 case WLAN_TDLS_TEARDOWN: 794 tf->category = WLAN_CATEGORY_TDLS; 795 tf->action_code = WLAN_TDLS_TEARDOWN; 796 797 skb_put(skb, sizeof(tf->u.teardown)); 798 tf->u.teardown.reason_code = cpu_to_le16(status_code); 799 break; 800 case WLAN_TDLS_DISCOVERY_REQUEST: 801 tf->category = WLAN_CATEGORY_TDLS; 802 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST; 803 804 skb_put(skb, sizeof(tf->u.discover_req)); 805 tf->u.discover_req.dialog_token = dialog_token; 806 break; 807 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 808 tf->category = WLAN_CATEGORY_TDLS; 809 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 810 811 skb_put(skb, sizeof(tf->u.chan_switch_req)); 812 break; 813 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 814 tf->category = WLAN_CATEGORY_TDLS; 815 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 816 817 skb_put(skb, sizeof(tf->u.chan_switch_resp)); 818 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code); 819 break; 820 default: 821 return -EINVAL; 822 } 823 824 return 0; 825 } 826 827 static int 828 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev, 829 const u8 *peer, u8 action_code, u8 dialog_token, 830 u16 status_code, struct sk_buff *skb) 831 { 832 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 833 struct ieee80211_mgmt *mgmt; 834 835 mgmt = skb_put_zero(skb, 24); 836 memcpy(mgmt->da, peer, ETH_ALEN); 837 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 838 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 839 840 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 841 IEEE80211_STYPE_ACTION); 842 843 switch (action_code) { 844 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 845 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp)); 846 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC; 847 mgmt->u.action.u.tdls_discover_resp.action_code = 848 WLAN_PUB_ACTION_TDLS_DISCOVER_RES; 849 mgmt->u.action.u.tdls_discover_resp.dialog_token = 850 dialog_token; 851 mgmt->u.action.u.tdls_discover_resp.capability = 852 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 853 status_code)); 854 break; 855 default: 856 return -EINVAL; 857 } 858 859 return 0; 860 } 861 862 static struct sk_buff * 863 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata, 864 const u8 *peer, u8 action_code, 865 u8 dialog_token, u16 status_code, 866 bool initiator, const u8 *extra_ies, 867 size_t extra_ies_len, u8 oper_class, 868 struct cfg80211_chan_def *chandef) 869 { 870 struct ieee80211_local *local = sdata->local; 871 struct sk_buff *skb; 872 int ret; 873 874 skb = netdev_alloc_skb(sdata->dev, 875 local->hw.extra_tx_headroom + 876 max(sizeof(struct ieee80211_mgmt), 877 sizeof(struct ieee80211_tdls_data)) + 878 50 + /* supported rates */ 879 10 + /* ext capab */ 880 26 + /* max(WMM-info, WMM-param) */ 881 2 + max(sizeof(struct ieee80211_ht_cap), 882 sizeof(struct ieee80211_ht_operation)) + 883 2 + max(sizeof(struct ieee80211_vht_cap), 884 sizeof(struct ieee80211_vht_operation)) + 885 50 + /* supported channels */ 886 3 + /* 40/20 BSS coex */ 887 4 + /* AID */ 888 4 + /* oper classes */ 889 extra_ies_len + 890 sizeof(struct ieee80211_tdls_lnkie)); 891 if (!skb) 892 return NULL; 893 894 skb_reserve(skb, local->hw.extra_tx_headroom); 895 896 switch (action_code) { 897 case WLAN_TDLS_SETUP_REQUEST: 898 case WLAN_TDLS_SETUP_RESPONSE: 899 case WLAN_TDLS_SETUP_CONFIRM: 900 case WLAN_TDLS_TEARDOWN: 901 case WLAN_TDLS_DISCOVERY_REQUEST: 902 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 903 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 904 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy, 905 sdata->dev, peer, 906 action_code, dialog_token, 907 status_code, skb); 908 break; 909 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 910 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev, 911 peer, action_code, 912 dialog_token, status_code, 913 skb); 914 break; 915 default: 916 ret = -ENOTSUPP; 917 break; 918 } 919 920 if (ret < 0) 921 goto fail; 922 923 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code, 924 initiator, extra_ies, extra_ies_len, oper_class, 925 chandef); 926 return skb; 927 928 fail: 929 dev_kfree_skb(skb); 930 return NULL; 931 } 932 933 static int 934 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, 935 const u8 *peer, u8 action_code, u8 dialog_token, 936 u16 status_code, u32 peer_capability, 937 bool initiator, const u8 *extra_ies, 938 size_t extra_ies_len, u8 oper_class, 939 struct cfg80211_chan_def *chandef) 940 { 941 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 942 struct sk_buff *skb = NULL; 943 struct sta_info *sta; 944 u32 flags = 0; 945 int ret = 0; 946 947 rcu_read_lock(); 948 sta = sta_info_get(sdata, peer); 949 950 /* infer the initiator if we can, to support old userspace */ 951 switch (action_code) { 952 case WLAN_TDLS_SETUP_REQUEST: 953 if (sta) { 954 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 955 sta->sta.tdls_initiator = false; 956 } 957 /* fall-through */ 958 case WLAN_TDLS_SETUP_CONFIRM: 959 case WLAN_TDLS_DISCOVERY_REQUEST: 960 initiator = true; 961 break; 962 case WLAN_TDLS_SETUP_RESPONSE: 963 /* 964 * In some testing scenarios, we send a request and response. 965 * Make the last packet sent take effect for the initiator 966 * value. 967 */ 968 if (sta) { 969 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 970 sta->sta.tdls_initiator = true; 971 } 972 /* fall-through */ 973 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 974 initiator = false; 975 break; 976 case WLAN_TDLS_TEARDOWN: 977 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 978 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 979 /* any value is ok */ 980 break; 981 default: 982 ret = -ENOTSUPP; 983 break; 984 } 985 986 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR)) 987 initiator = true; 988 989 rcu_read_unlock(); 990 if (ret < 0) 991 goto fail; 992 993 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code, 994 dialog_token, status_code, 995 initiator, extra_ies, 996 extra_ies_len, oper_class, 997 chandef); 998 if (!skb) { 999 ret = -EINVAL; 1000 goto fail; 1001 } 1002 1003 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { 1004 ieee80211_tx_skb(sdata, skb); 1005 return 0; 1006 } 1007 1008 /* 1009 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise 1010 * we should default to AC_VI. 1011 */ 1012 switch (action_code) { 1013 case WLAN_TDLS_SETUP_REQUEST: 1014 case WLAN_TDLS_SETUP_RESPONSE: 1015 skb->priority = 256 + 2; 1016 break; 1017 default: 1018 skb->priority = 256 + 5; 1019 break; 1020 } 1021 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb)); 1022 1023 /* 1024 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress. 1025 * Later, if no ACK is returned from peer, we will re-send the teardown 1026 * packet through the AP. 1027 */ 1028 if ((action_code == WLAN_TDLS_TEARDOWN) && 1029 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 1030 bool try_resend; /* Should we keep skb for possible resend */ 1031 1032 /* If not sending directly to peer - no point in keeping skb */ 1033 rcu_read_lock(); 1034 sta = sta_info_get(sdata, peer); 1035 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1036 rcu_read_unlock(); 1037 1038 spin_lock_bh(&sdata->u.mgd.teardown_lock); 1039 if (try_resend && !sdata->u.mgd.teardown_skb) { 1040 /* Mark it as requiring TX status callback */ 1041 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 1042 IEEE80211_TX_INTFL_MLME_CONN_TX; 1043 1044 /* 1045 * skb is copied since mac80211 will later set 1046 * properties that might not be the same as the AP, 1047 * such as encryption, QoS, addresses, etc. 1048 * 1049 * No problem if skb_copy() fails, so no need to check. 1050 */ 1051 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC); 1052 sdata->u.mgd.orig_teardown_skb = skb; 1053 } 1054 spin_unlock_bh(&sdata->u.mgd.teardown_lock); 1055 } 1056 1057 /* disable bottom halves when entering the Tx path */ 1058 local_bh_disable(); 1059 __ieee80211_subif_start_xmit(skb, dev, flags, 0); 1060 local_bh_enable(); 1061 1062 return ret; 1063 1064 fail: 1065 dev_kfree_skb(skb); 1066 return ret; 1067 } 1068 1069 static int 1070 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, 1071 const u8 *peer, u8 action_code, u8 dialog_token, 1072 u16 status_code, u32 peer_capability, bool initiator, 1073 const u8 *extra_ies, size_t extra_ies_len) 1074 { 1075 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1076 struct ieee80211_local *local = sdata->local; 1077 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode; 1078 int ret; 1079 1080 /* don't support setup with forced SMPS mode that's not off */ 1081 if (smps_mode != IEEE80211_SMPS_AUTOMATIC && 1082 smps_mode != IEEE80211_SMPS_OFF) { 1083 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n", 1084 smps_mode); 1085 return -ENOTSUPP; 1086 } 1087 1088 mutex_lock(&local->mtx); 1089 1090 /* we don't support concurrent TDLS peer setups */ 1091 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && 1092 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1093 ret = -EBUSY; 1094 goto out_unlock; 1095 } 1096 1097 /* 1098 * make sure we have a STA representing the peer so we drop or buffer 1099 * non-TDLS-setup frames to the peer. We can't send other packets 1100 * during setup through the AP path. 1101 * Allow error packets to be sent - sometimes we don't even add a STA 1102 * before failing the setup. 1103 */ 1104 if (status_code == 0) { 1105 rcu_read_lock(); 1106 if (!sta_info_get(sdata, peer)) { 1107 rcu_read_unlock(); 1108 ret = -ENOLINK; 1109 goto out_unlock; 1110 } 1111 rcu_read_unlock(); 1112 } 1113 1114 ieee80211_flush_queues(local, sdata, false); 1115 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); 1116 mutex_unlock(&local->mtx); 1117 1118 /* we cannot take the mutex while preparing the setup packet */ 1119 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1120 dialog_token, status_code, 1121 peer_capability, initiator, 1122 extra_ies, extra_ies_len, 0, 1123 NULL); 1124 if (ret < 0) { 1125 mutex_lock(&local->mtx); 1126 eth_zero_addr(sdata->u.mgd.tdls_peer); 1127 mutex_unlock(&local->mtx); 1128 return ret; 1129 } 1130 1131 ieee80211_queue_delayed_work(&sdata->local->hw, 1132 &sdata->u.mgd.tdls_peer_del_work, 1133 TDLS_PEER_SETUP_TIMEOUT); 1134 return 0; 1135 1136 out_unlock: 1137 mutex_unlock(&local->mtx); 1138 return ret; 1139 } 1140 1141 static int 1142 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, 1143 const u8 *peer, u8 action_code, u8 dialog_token, 1144 u16 status_code, u32 peer_capability, 1145 bool initiator, const u8 *extra_ies, 1146 size_t extra_ies_len) 1147 { 1148 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1149 struct ieee80211_local *local = sdata->local; 1150 struct sta_info *sta; 1151 int ret; 1152 1153 /* 1154 * No packets can be transmitted to the peer via the AP during setup - 1155 * the STA is set as a TDLS peer, but is not authorized. 1156 * During teardown, we prevent direct transmissions by stopping the 1157 * queues and flushing all direct packets. 1158 */ 1159 ieee80211_stop_vif_queues(local, sdata, 1160 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1161 ieee80211_flush_queues(local, sdata, false); 1162 1163 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1164 dialog_token, status_code, 1165 peer_capability, initiator, 1166 extra_ies, extra_ies_len, 0, 1167 NULL); 1168 if (ret < 0) 1169 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", 1170 ret); 1171 1172 /* 1173 * Remove the STA AUTH flag to force further traffic through the AP. If 1174 * the STA was unreachable, it was already removed. 1175 */ 1176 rcu_read_lock(); 1177 sta = sta_info_get(sdata, peer); 1178 if (sta) 1179 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1180 rcu_read_unlock(); 1181 1182 ieee80211_wake_vif_queues(local, sdata, 1183 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1184 1185 return 0; 1186 } 1187 1188 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 1189 const u8 *peer, u8 action_code, u8 dialog_token, 1190 u16 status_code, u32 peer_capability, 1191 bool initiator, const u8 *extra_ies, 1192 size_t extra_ies_len) 1193 { 1194 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1195 int ret; 1196 1197 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1198 return -ENOTSUPP; 1199 1200 /* make sure we are in managed mode, and associated */ 1201 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1202 !sdata->u.mgd.associated) 1203 return -EINVAL; 1204 1205 switch (action_code) { 1206 case WLAN_TDLS_SETUP_REQUEST: 1207 case WLAN_TDLS_SETUP_RESPONSE: 1208 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code, 1209 dialog_token, status_code, 1210 peer_capability, initiator, 1211 extra_ies, extra_ies_len); 1212 break; 1213 case WLAN_TDLS_TEARDOWN: 1214 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, 1215 action_code, dialog_token, 1216 status_code, 1217 peer_capability, initiator, 1218 extra_ies, extra_ies_len); 1219 break; 1220 case WLAN_TDLS_DISCOVERY_REQUEST: 1221 /* 1222 * Protect the discovery so we can hear the TDLS discovery 1223 * response frame. It is transmitted directly and not buffered 1224 * by the AP. 1225 */ 1226 drv_mgd_protect_tdls_discover(sdata->local, sdata); 1227 /* fall-through */ 1228 case WLAN_TDLS_SETUP_CONFIRM: 1229 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1230 /* no special handling */ 1231 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1232 action_code, 1233 dialog_token, 1234 status_code, 1235 peer_capability, 1236 initiator, extra_ies, 1237 extra_ies_len, 0, NULL); 1238 break; 1239 default: 1240 ret = -EOPNOTSUPP; 1241 break; 1242 } 1243 1244 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n", 1245 action_code, peer, ret); 1246 return ret; 1247 } 1248 1249 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata, 1250 struct sta_info *sta) 1251 { 1252 struct ieee80211_local *local = sdata->local; 1253 struct ieee80211_chanctx_conf *conf; 1254 struct ieee80211_chanctx *ctx; 1255 enum nl80211_chan_width width; 1256 struct ieee80211_supported_band *sband; 1257 1258 mutex_lock(&local->chanctx_mtx); 1259 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1260 lockdep_is_held(&local->chanctx_mtx)); 1261 if (conf) { 1262 width = conf->def.width; 1263 sband = local->hw.wiphy->bands[conf->def.chan->band]; 1264 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1265 ieee80211_recalc_chanctx_chantype(local, ctx); 1266 1267 /* if width changed and a peer is given, update its BW */ 1268 if (width != conf->def.width && sta && 1269 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) { 1270 enum ieee80211_sta_rx_bandwidth bw; 1271 1272 bw = ieee80211_chan_width_to_rx_bw(conf->def.width); 1273 bw = min(bw, ieee80211_sta_cap_rx_bw(sta)); 1274 if (bw != sta->sta.bandwidth) { 1275 sta->sta.bandwidth = bw; 1276 rate_control_rate_update(local, sband, sta, 1277 IEEE80211_RC_BW_CHANGED); 1278 /* 1279 * if a TDLS peer BW was updated, we need to 1280 * recalc the chandef width again, to get the 1281 * correct chanctx min_def 1282 */ 1283 ieee80211_recalc_chanctx_chantype(local, ctx); 1284 } 1285 } 1286 1287 } 1288 mutex_unlock(&local->chanctx_mtx); 1289 } 1290 1291 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata) 1292 { 1293 struct sta_info *sta; 1294 bool result = false; 1295 1296 rcu_read_lock(); 1297 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1298 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1299 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 1300 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) || 1301 !sta->sta.ht_cap.ht_supported) 1302 continue; 1303 result = true; 1304 break; 1305 } 1306 rcu_read_unlock(); 1307 1308 return result; 1309 } 1310 1311 static void 1312 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata, 1313 struct sta_info *sta) 1314 { 1315 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1316 bool tdls_ht; 1317 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 1318 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 1319 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 1320 u16 opmode; 1321 1322 /* Nothing to do if the BSS connection uses HT */ 1323 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 1324 return; 1325 1326 tdls_ht = (sta && sta->sta.ht_cap.ht_supported) || 1327 iee80211_tdls_have_ht_peers(sdata); 1328 1329 opmode = sdata->vif.bss_conf.ht_operation_mode; 1330 1331 if (tdls_ht) 1332 opmode |= protection; 1333 else 1334 opmode &= ~protection; 1335 1336 if (opmode == sdata->vif.bss_conf.ht_operation_mode) 1337 return; 1338 1339 sdata->vif.bss_conf.ht_operation_mode = opmode; 1340 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT); 1341 } 1342 1343 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 1344 const u8 *peer, enum nl80211_tdls_operation oper) 1345 { 1346 struct sta_info *sta; 1347 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1348 struct ieee80211_local *local = sdata->local; 1349 int ret; 1350 1351 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1352 return -ENOTSUPP; 1353 1354 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1355 return -EINVAL; 1356 1357 switch (oper) { 1358 case NL80211_TDLS_ENABLE_LINK: 1359 case NL80211_TDLS_DISABLE_LINK: 1360 break; 1361 case NL80211_TDLS_TEARDOWN: 1362 case NL80211_TDLS_SETUP: 1363 case NL80211_TDLS_DISCOVERY_REQ: 1364 /* We don't support in-driver setup/teardown/discovery */ 1365 return -ENOTSUPP; 1366 } 1367 1368 /* protect possible bss_conf changes and avoid concurrency in 1369 * ieee80211_bss_info_change_notify() 1370 */ 1371 sdata_lock(sdata); 1372 mutex_lock(&local->mtx); 1373 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); 1374 1375 switch (oper) { 1376 case NL80211_TDLS_ENABLE_LINK: 1377 if (sdata->vif.csa_active) { 1378 tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); 1379 ret = -EBUSY; 1380 break; 1381 } 1382 1383 mutex_lock(&local->sta_mtx); 1384 sta = sta_info_get(sdata, peer); 1385 if (!sta) { 1386 mutex_unlock(&local->sta_mtx); 1387 ret = -ENOLINK; 1388 break; 1389 } 1390 1391 iee80211_tdls_recalc_chanctx(sdata, sta); 1392 iee80211_tdls_recalc_ht_protection(sdata, sta); 1393 1394 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1395 mutex_unlock(&local->sta_mtx); 1396 1397 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || 1398 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); 1399 ret = 0; 1400 break; 1401 case NL80211_TDLS_DISABLE_LINK: 1402 /* 1403 * The teardown message in ieee80211_tdls_mgmt_teardown() was 1404 * created while the queues were stopped, so it might still be 1405 * pending. Before flushing the queues we need to be sure the 1406 * message is handled by the tasklet handling pending messages, 1407 * otherwise we might start destroying the station before 1408 * sending the teardown packet. 1409 * Note that this only forces the tasklet to flush pendings - 1410 * not to stop the tasklet from rescheduling itself. 1411 */ 1412 tasklet_kill(&local->tx_pending_tasklet); 1413 /* flush a potentially queued teardown packet */ 1414 ieee80211_flush_queues(local, sdata, false); 1415 1416 ret = sta_info_destroy_addr(sdata, peer); 1417 1418 mutex_lock(&local->sta_mtx); 1419 iee80211_tdls_recalc_ht_protection(sdata, NULL); 1420 mutex_unlock(&local->sta_mtx); 1421 1422 iee80211_tdls_recalc_chanctx(sdata, NULL); 1423 break; 1424 default: 1425 ret = -ENOTSUPP; 1426 break; 1427 } 1428 1429 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1430 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work); 1431 eth_zero_addr(sdata->u.mgd.tdls_peer); 1432 } 1433 1434 if (ret == 0) 1435 ieee80211_queue_work(&sdata->local->hw, 1436 &sdata->u.mgd.request_smps_work); 1437 1438 mutex_unlock(&local->mtx); 1439 sdata_unlock(sdata); 1440 return ret; 1441 } 1442 1443 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, 1444 enum nl80211_tdls_operation oper, 1445 u16 reason_code, gfp_t gfp) 1446 { 1447 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1448 1449 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) { 1450 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", 1451 oper); 1452 return; 1453 } 1454 1455 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); 1456 } 1457 EXPORT_SYMBOL(ieee80211_tdls_oper_request); 1458 1459 static void 1460 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) 1461 { 1462 struct ieee80211_ch_switch_timing *ch_sw; 1463 1464 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; 1465 *buf++ = sizeof(struct ieee80211_ch_switch_timing); 1466 1467 ch_sw = (void *)buf; 1468 ch_sw->switch_time = cpu_to_le16(switch_time); 1469 ch_sw->switch_timeout = cpu_to_le16(switch_timeout); 1470 } 1471 1472 /* find switch timing IE in SKB ready for Tx */ 1473 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) 1474 { 1475 struct ieee80211_tdls_data *tf; 1476 const u8 *ie_start; 1477 1478 /* 1479 * Get the offset for the new location of the switch timing IE. 1480 * The SKB network header will now point to the "payload_type" 1481 * element of the TDLS data frame struct. 1482 */ 1483 tf = container_of(skb->data + skb_network_offset(skb), 1484 struct ieee80211_tdls_data, payload_type); 1485 ie_start = tf->u.chan_switch_req.variable; 1486 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, 1487 skb->len - (ie_start - skb->data)); 1488 } 1489 1490 static struct sk_buff * 1491 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, 1492 struct cfg80211_chan_def *chandef, 1493 u32 *ch_sw_tm_ie_offset) 1494 { 1495 struct ieee80211_sub_if_data *sdata = sta->sdata; 1496 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 1497 2 + sizeof(struct ieee80211_ch_switch_timing)]; 1498 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); 1499 u8 *pos = extra_ies; 1500 struct sk_buff *skb; 1501 1502 /* 1503 * if chandef points to a wide channel add a Secondary-Channel 1504 * Offset information element 1505 */ 1506 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1507 struct ieee80211_sec_chan_offs_ie *sec_chan_ie; 1508 bool ht40plus; 1509 1510 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 1511 *pos++ = sizeof(*sec_chan_ie); 1512 sec_chan_ie = (void *)pos; 1513 1514 ht40plus = cfg80211_get_chandef_type(chandef) == 1515 NL80211_CHAN_HT40PLUS; 1516 sec_chan_ie->sec_chan_offs = ht40plus ? 1517 IEEE80211_HT_PARAM_CHA_SEC_ABOVE : 1518 IEEE80211_HT_PARAM_CHA_SEC_BELOW; 1519 pos += sizeof(*sec_chan_ie); 1520 1521 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 1522 } 1523 1524 /* just set the values to 0, this is a template */ 1525 iee80211_tdls_add_ch_switch_timing(pos, 0, 0); 1526 1527 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1528 WLAN_TDLS_CHANNEL_SWITCH_REQUEST, 1529 0, 0, !sta->sta.tdls_initiator, 1530 extra_ies, extra_ies_len, 1531 oper_class, chandef); 1532 if (!skb) 1533 return NULL; 1534 1535 skb = ieee80211_build_data_template(sdata, skb, 0); 1536 if (IS_ERR(skb)) { 1537 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); 1538 return NULL; 1539 } 1540 1541 if (ch_sw_tm_ie_offset) { 1542 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1543 1544 if (!tm_ie) { 1545 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); 1546 dev_kfree_skb_any(skb); 1547 return NULL; 1548 } 1549 1550 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1551 } 1552 1553 tdls_dbg(sdata, 1554 "TDLS channel switch request template for %pM ch %d width %d\n", 1555 sta->sta.addr, chandef->chan->center_freq, chandef->width); 1556 return skb; 1557 } 1558 1559 int 1560 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, 1561 const u8 *addr, u8 oper_class, 1562 struct cfg80211_chan_def *chandef) 1563 { 1564 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1565 struct ieee80211_local *local = sdata->local; 1566 struct sta_info *sta; 1567 struct sk_buff *skb = NULL; 1568 u32 ch_sw_tm_ie; 1569 int ret; 1570 1571 mutex_lock(&local->sta_mtx); 1572 sta = sta_info_get(sdata, addr); 1573 if (!sta) { 1574 tdls_dbg(sdata, 1575 "Invalid TDLS peer %pM for channel switch request\n", 1576 addr); 1577 ret = -ENOENT; 1578 goto out; 1579 } 1580 1581 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { 1582 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", 1583 addr); 1584 ret = -ENOTSUPP; 1585 goto out; 1586 } 1587 1588 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, 1589 &ch_sw_tm_ie); 1590 if (!skb) { 1591 ret = -ENOENT; 1592 goto out; 1593 } 1594 1595 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, 1596 chandef, skb, ch_sw_tm_ie); 1597 if (!ret) 1598 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1599 1600 out: 1601 mutex_unlock(&local->sta_mtx); 1602 dev_kfree_skb_any(skb); 1603 return ret; 1604 } 1605 1606 void 1607 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, 1608 struct net_device *dev, 1609 const u8 *addr) 1610 { 1611 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1612 struct ieee80211_local *local = sdata->local; 1613 struct sta_info *sta; 1614 1615 mutex_lock(&local->sta_mtx); 1616 sta = sta_info_get(sdata, addr); 1617 if (!sta) { 1618 tdls_dbg(sdata, 1619 "Invalid TDLS peer %pM for channel switch cancel\n", 1620 addr); 1621 goto out; 1622 } 1623 1624 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 1625 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", 1626 addr); 1627 goto out; 1628 } 1629 1630 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 1631 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1632 1633 out: 1634 mutex_unlock(&local->sta_mtx); 1635 } 1636 1637 static struct sk_buff * 1638 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, 1639 u32 *ch_sw_tm_ie_offset) 1640 { 1641 struct ieee80211_sub_if_data *sdata = sta->sdata; 1642 struct sk_buff *skb; 1643 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; 1644 1645 /* initial timing are always zero in the template */ 1646 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); 1647 1648 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1649 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, 1650 0, 0, !sta->sta.tdls_initiator, 1651 extra_ies, sizeof(extra_ies), 0, NULL); 1652 if (!skb) 1653 return NULL; 1654 1655 skb = ieee80211_build_data_template(sdata, skb, 0); 1656 if (IS_ERR(skb)) { 1657 tdls_dbg(sdata, 1658 "Failed building TDLS channel switch resp frame\n"); 1659 return NULL; 1660 } 1661 1662 if (ch_sw_tm_ie_offset) { 1663 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1664 1665 if (!tm_ie) { 1666 tdls_dbg(sdata, 1667 "No switch timing IE in TDLS switch resp\n"); 1668 dev_kfree_skb_any(skb); 1669 return NULL; 1670 } 1671 1672 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1673 } 1674 1675 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", 1676 sta->sta.addr); 1677 return skb; 1678 } 1679 1680 static int 1681 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, 1682 struct sk_buff *skb) 1683 { 1684 struct ieee80211_local *local = sdata->local; 1685 struct ieee802_11_elems elems; 1686 struct sta_info *sta; 1687 struct ieee80211_tdls_data *tf = (void *)skb->data; 1688 bool local_initiator; 1689 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1690 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); 1691 struct ieee80211_tdls_ch_sw_params params = {}; 1692 int ret; 1693 1694 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 1695 params.timestamp = rx_status->device_timestamp; 1696 1697 if (skb->len < baselen) { 1698 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", 1699 skb->len); 1700 return -EINVAL; 1701 } 1702 1703 mutex_lock(&local->sta_mtx); 1704 sta = sta_info_get(sdata, tf->sa); 1705 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1706 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1707 tf->sa); 1708 ret = -EINVAL; 1709 goto out; 1710 } 1711 1712 params.sta = &sta->sta; 1713 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); 1714 if (params.status != 0) { 1715 ret = 0; 1716 goto call_drv; 1717 } 1718 1719 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, 1720 skb->len - baselen, false, &elems, 1721 NULL, NULL); 1722 if (elems.parse_error) { 1723 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); 1724 ret = -EINVAL; 1725 goto out; 1726 } 1727 1728 if (!elems.ch_sw_timing || !elems.lnk_id) { 1729 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); 1730 ret = -EINVAL; 1731 goto out; 1732 } 1733 1734 /* validate the initiator is set correctly */ 1735 local_initiator = 1736 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1737 if (local_initiator == sta->sta.tdls_initiator) { 1738 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1739 ret = -EINVAL; 1740 goto out; 1741 } 1742 1743 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); 1744 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); 1745 1746 params.tmpl_skb = 1747 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); 1748 if (!params.tmpl_skb) { 1749 ret = -ENOENT; 1750 goto out; 1751 } 1752 1753 ret = 0; 1754 call_drv: 1755 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1756 1757 tdls_dbg(sdata, 1758 "TDLS channel switch response received from %pM status %d\n", 1759 tf->sa, params.status); 1760 1761 out: 1762 mutex_unlock(&local->sta_mtx); 1763 dev_kfree_skb_any(params.tmpl_skb); 1764 return ret; 1765 } 1766 1767 static int 1768 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, 1769 struct sk_buff *skb) 1770 { 1771 struct ieee80211_local *local = sdata->local; 1772 struct ieee802_11_elems elems; 1773 struct cfg80211_chan_def chandef; 1774 struct ieee80211_channel *chan; 1775 enum nl80211_channel_type chan_type; 1776 int freq; 1777 u8 target_channel, oper_class; 1778 bool local_initiator; 1779 struct sta_info *sta; 1780 enum nl80211_band band; 1781 struct ieee80211_tdls_data *tf = (void *)skb->data; 1782 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1783 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); 1784 struct ieee80211_tdls_ch_sw_params params = {}; 1785 int ret = 0; 1786 1787 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 1788 params.timestamp = rx_status->device_timestamp; 1789 1790 if (skb->len < baselen) { 1791 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", 1792 skb->len); 1793 return -EINVAL; 1794 } 1795 1796 target_channel = tf->u.chan_switch_req.target_channel; 1797 oper_class = tf->u.chan_switch_req.oper_class; 1798 1799 /* 1800 * We can't easily infer the channel band. The operating class is 1801 * ambiguous - there are multiple tables (US/Europe/JP/Global). The 1802 * solution here is to treat channels with number >14 as 5GHz ones, 1803 * and specifically check for the (oper_class, channel) combinations 1804 * where this doesn't hold. These are thankfully unique according to 1805 * IEEE802.11-2012. 1806 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as 1807 * valid here. 1808 */ 1809 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || 1810 oper_class == 4 || oper_class == 5 || oper_class == 6) && 1811 target_channel < 14) 1812 band = NL80211_BAND_5GHZ; 1813 else 1814 band = target_channel < 14 ? NL80211_BAND_2GHZ : 1815 NL80211_BAND_5GHZ; 1816 1817 freq = ieee80211_channel_to_frequency(target_channel, band); 1818 if (freq == 0) { 1819 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", 1820 target_channel); 1821 return -EINVAL; 1822 } 1823 1824 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 1825 if (!chan) { 1826 tdls_dbg(sdata, 1827 "Unsupported channel for TDLS chan switch: %d\n", 1828 target_channel); 1829 return -EINVAL; 1830 } 1831 1832 ieee802_11_parse_elems(tf->u.chan_switch_req.variable, 1833 skb->len - baselen, false, &elems, NULL, NULL); 1834 if (elems.parse_error) { 1835 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); 1836 return -EINVAL; 1837 } 1838 1839 if (!elems.ch_sw_timing || !elems.lnk_id) { 1840 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); 1841 return -EINVAL; 1842 } 1843 1844 if (!elems.sec_chan_offs) { 1845 chan_type = NL80211_CHAN_HT20; 1846 } else { 1847 switch (elems.sec_chan_offs->sec_chan_offs) { 1848 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 1849 chan_type = NL80211_CHAN_HT40PLUS; 1850 break; 1851 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 1852 chan_type = NL80211_CHAN_HT40MINUS; 1853 break; 1854 default: 1855 chan_type = NL80211_CHAN_HT20; 1856 break; 1857 } 1858 } 1859 1860 cfg80211_chandef_create(&chandef, chan, chan_type); 1861 1862 /* we will be active on the TDLS link */ 1863 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, 1864 sdata->wdev.iftype)) { 1865 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); 1866 return -EINVAL; 1867 } 1868 1869 mutex_lock(&local->sta_mtx); 1870 sta = sta_info_get(sdata, tf->sa); 1871 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1872 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1873 tf->sa); 1874 ret = -EINVAL; 1875 goto out; 1876 } 1877 1878 params.sta = &sta->sta; 1879 1880 /* validate the initiator is set correctly */ 1881 local_initiator = 1882 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1883 if (local_initiator == sta->sta.tdls_initiator) { 1884 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1885 ret = -EINVAL; 1886 goto out; 1887 } 1888 1889 /* peer should have known better */ 1890 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs && 1891 elems.sec_chan_offs->sec_chan_offs) { 1892 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); 1893 ret = -ENOTSUPP; 1894 goto out; 1895 } 1896 1897 params.chandef = &chandef; 1898 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); 1899 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); 1900 1901 params.tmpl_skb = 1902 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, 1903 ¶ms.ch_sw_tm_ie); 1904 if (!params.tmpl_skb) { 1905 ret = -ENOENT; 1906 goto out; 1907 } 1908 1909 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1910 1911 tdls_dbg(sdata, 1912 "TDLS ch switch request received from %pM ch %d width %d\n", 1913 tf->sa, params.chandef->chan->center_freq, 1914 params.chandef->width); 1915 out: 1916 mutex_unlock(&local->sta_mtx); 1917 dev_kfree_skb_any(params.tmpl_skb); 1918 return ret; 1919 } 1920 1921 static void 1922 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, 1923 struct sk_buff *skb) 1924 { 1925 struct ieee80211_tdls_data *tf = (void *)skb->data; 1926 struct wiphy *wiphy = sdata->local->hw.wiphy; 1927 1928 ASSERT_RTNL(); 1929 1930 /* make sure the driver supports it */ 1931 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) 1932 return; 1933 1934 /* we want to access the entire packet */ 1935 if (skb_linearize(skb)) 1936 return; 1937 /* 1938 * The packet/size was already validated by mac80211 Rx path, only look 1939 * at the action type. 1940 */ 1941 switch (tf->action_code) { 1942 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 1943 ieee80211_process_tdls_channel_switch_req(sdata, skb); 1944 break; 1945 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 1946 ieee80211_process_tdls_channel_switch_resp(sdata, skb); 1947 break; 1948 default: 1949 WARN_ON_ONCE(1); 1950 return; 1951 } 1952 } 1953 1954 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata) 1955 { 1956 struct sta_info *sta; 1957 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 1958 1959 rcu_read_lock(); 1960 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1961 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1962 !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 1963 continue; 1964 1965 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, 1966 NL80211_TDLS_TEARDOWN, reason, 1967 GFP_ATOMIC); 1968 } 1969 rcu_read_unlock(); 1970 } 1971 1972 void ieee80211_tdls_chsw_work(struct work_struct *wk) 1973 { 1974 struct ieee80211_local *local = 1975 container_of(wk, struct ieee80211_local, tdls_chsw_work); 1976 struct ieee80211_sub_if_data *sdata; 1977 struct sk_buff *skb; 1978 struct ieee80211_tdls_data *tf; 1979 1980 rtnl_lock(); 1981 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) { 1982 tf = (struct ieee80211_tdls_data *)skb->data; 1983 list_for_each_entry(sdata, &local->interfaces, list) { 1984 if (!ieee80211_sdata_running(sdata) || 1985 sdata->vif.type != NL80211_IFTYPE_STATION || 1986 !ether_addr_equal(tf->da, sdata->vif.addr)) 1987 continue; 1988 1989 ieee80211_process_tdls_channel_switch(sdata, skb); 1990 break; 1991 } 1992 1993 kfree_skb(skb); 1994 } 1995 rtnl_unlock(); 1996 } 1997