1 /* 2 * mac80211 TDLS handling code 3 * 4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 5 * Copyright 2014, Intel Corporation 6 * Copyright 2014 Intel Mobile Communications GmbH 7 * Copyright 2015 Intel Deutschland GmbH 8 * 9 * This file is GPLv2 as found in COPYING. 10 */ 11 12 #include <linux/ieee80211.h> 13 #include <linux/log2.h> 14 #include <net/cfg80211.h> 15 #include <linux/rtnetlink.h> 16 #include "ieee80211_i.h" 17 #include "driver-ops.h" 18 19 /* give usermode some time for retries in setting up the TDLS session */ 20 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ) 21 22 void ieee80211_tdls_peer_del_work(struct work_struct *wk) 23 { 24 struct ieee80211_sub_if_data *sdata; 25 struct ieee80211_local *local; 26 27 sdata = container_of(wk, struct ieee80211_sub_if_data, 28 u.mgd.tdls_peer_del_work.work); 29 local = sdata->local; 30 31 mutex_lock(&local->mtx); 32 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) { 33 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer); 34 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer); 35 eth_zero_addr(sdata->u.mgd.tdls_peer); 36 } 37 mutex_unlock(&local->mtx); 38 } 39 40 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata, 41 struct sk_buff *skb) 42 { 43 struct ieee80211_local *local = sdata->local; 44 bool chan_switch = local->hw.wiphy->features & 45 NL80211_FEATURE_TDLS_CHANNEL_SWITCH; 46 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW); 47 enum ieee80211_band band = ieee80211_get_sdata_band(sdata); 48 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; 49 bool vht = sband && sband->vht_cap.vht_supported; 50 u8 *pos = (void *)skb_put(skb, 10); 51 52 *pos++ = WLAN_EID_EXT_CAPABILITY; 53 *pos++ = 8; /* len */ 54 *pos++ = 0x0; 55 *pos++ = 0x0; 56 *pos++ = 0x0; 57 *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0; 58 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED; 59 *pos++ = 0; 60 *pos++ = 0; 61 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0; 62 } 63 64 static u8 65 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata, 66 struct sk_buff *skb, u16 start, u16 end, 67 u16 spacing) 68 { 69 u8 subband_cnt = 0, ch_cnt = 0; 70 struct ieee80211_channel *ch; 71 struct cfg80211_chan_def chandef; 72 int i, subband_start; 73 struct wiphy *wiphy = sdata->local->hw.wiphy; 74 75 for (i = start; i <= end; i += spacing) { 76 if (!ch_cnt) 77 subband_start = i; 78 79 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i); 80 if (ch) { 81 /* we will be active on the channel */ 82 cfg80211_chandef_create(&chandef, ch, 83 NL80211_CHAN_NO_HT); 84 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef, 85 sdata->wdev.iftype)) { 86 ch_cnt++; 87 /* 88 * check if the next channel is also part of 89 * this allowed range 90 */ 91 continue; 92 } 93 } 94 95 /* 96 * we've reached the end of a range, with allowed channels 97 * found 98 */ 99 if (ch_cnt) { 100 u8 *pos = skb_put(skb, 2); 101 *pos++ = ieee80211_frequency_to_channel(subband_start); 102 *pos++ = ch_cnt; 103 104 subband_cnt++; 105 ch_cnt = 0; 106 } 107 } 108 109 /* all channels in the requested range are allowed - add them here */ 110 if (ch_cnt) { 111 u8 *pos = skb_put(skb, 2); 112 *pos++ = ieee80211_frequency_to_channel(subband_start); 113 *pos++ = ch_cnt; 114 115 subband_cnt++; 116 } 117 118 return subband_cnt; 119 } 120 121 static void 122 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata, 123 struct sk_buff *skb) 124 { 125 /* 126 * Add possible channels for TDLS. These are channels that are allowed 127 * to be active. 128 */ 129 u8 subband_cnt; 130 u8 *pos = skb_put(skb, 2); 131 132 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 133 134 /* 135 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as 136 * this doesn't happen in real world scenarios. 137 */ 138 139 /* 2GHz, with 5MHz spacing */ 140 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5); 141 142 /* 5GHz, with 20MHz spacing */ 143 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20); 144 145 /* length */ 146 *pos = 2 * subband_cnt; 147 } 148 149 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata, 150 struct sk_buff *skb) 151 { 152 u8 *pos; 153 u8 op_class; 154 155 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef, 156 &op_class)) 157 return; 158 159 pos = skb_put(skb, 4); 160 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES; 161 *pos++ = 2; /* len */ 162 163 *pos++ = op_class; 164 *pos++ = op_class; /* give current operating class as alternate too */ 165 } 166 167 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb) 168 { 169 u8 *pos = (void *)skb_put(skb, 3); 170 171 *pos++ = WLAN_EID_BSS_COEX_2040; 172 *pos++ = 1; /* len */ 173 174 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST; 175 } 176 177 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata, 178 u16 status_code) 179 { 180 /* The capability will be 0 when sending a failure code */ 181 if (status_code != 0) 182 return 0; 183 184 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_2GHZ) { 185 return WLAN_CAPABILITY_SHORT_SLOT_TIME | 186 WLAN_CAPABILITY_SHORT_PREAMBLE; 187 } 188 189 return 0; 190 } 191 192 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata, 193 struct sk_buff *skb, const u8 *peer, 194 bool initiator) 195 { 196 struct ieee80211_tdls_lnkie *lnkid; 197 const u8 *init_addr, *rsp_addr; 198 199 if (initiator) { 200 init_addr = sdata->vif.addr; 201 rsp_addr = peer; 202 } else { 203 init_addr = peer; 204 rsp_addr = sdata->vif.addr; 205 } 206 207 lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie)); 208 209 lnkid->ie_type = WLAN_EID_LINK_ID; 210 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2; 211 212 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN); 213 memcpy(lnkid->init_sta, init_addr, ETH_ALEN); 214 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN); 215 } 216 217 static void 218 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 219 { 220 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 221 u8 *pos = (void *)skb_put(skb, 4); 222 223 *pos++ = WLAN_EID_AID; 224 *pos++ = 2; /* len */ 225 put_unaligned_le16(ifmgd->aid, pos); 226 } 227 228 /* translate numbering in the WMM parameter IE to the mac80211 notation */ 229 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac) 230 { 231 switch (ac) { 232 default: 233 WARN_ON_ONCE(1); 234 case 0: 235 return IEEE80211_AC_BE; 236 case 1: 237 return IEEE80211_AC_BK; 238 case 2: 239 return IEEE80211_AC_VI; 240 case 3: 241 return IEEE80211_AC_VO; 242 } 243 } 244 245 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci) 246 { 247 u8 ret; 248 249 ret = aifsn & 0x0f; 250 if (acm) 251 ret |= 0x10; 252 ret |= (aci << 5) & 0x60; 253 return ret; 254 } 255 256 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max) 257 { 258 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) | 259 ((ilog2(cw_max + 1) << 0x4) & 0xf0); 260 } 261 262 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata, 263 struct sk_buff *skb) 264 { 265 struct ieee80211_wmm_param_ie *wmm; 266 struct ieee80211_tx_queue_params *txq; 267 int i; 268 269 wmm = (void *)skb_put(skb, sizeof(*wmm)); 270 memset(wmm, 0, sizeof(*wmm)); 271 272 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC; 273 wmm->len = sizeof(*wmm) - 2; 274 275 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */ 276 wmm->oui[1] = 0x50; 277 wmm->oui[2] = 0xf2; 278 wmm->oui_type = 2; /* WME */ 279 wmm->oui_subtype = 1; /* WME param */ 280 wmm->version = 1; /* WME ver */ 281 wmm->qos_info = 0; /* U-APSD not in use */ 282 283 /* 284 * Use the EDCA parameters defined for the BSS, or default if the AP 285 * doesn't support it, as mandated by 802.11-2012 section 10.22.4 286 */ 287 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 288 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)]; 289 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs, 290 txq->acm, i); 291 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max); 292 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop); 293 } 294 } 295 296 static void 297 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata, 298 struct sta_info *sta) 299 { 300 /* IEEE802.11ac-2013 Table E-4 */ 301 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 }; 302 struct cfg80211_chan_def uc = sta->tdls_chandef; 303 enum nl80211_chan_width max_width = ieee80211_get_sta_bw(&sta->sta); 304 int i; 305 306 /* only support upgrading non-narrow channels up to 80Mhz */ 307 if (max_width == NL80211_CHAN_WIDTH_5 || 308 max_width == NL80211_CHAN_WIDTH_10) 309 return; 310 311 if (max_width > NL80211_CHAN_WIDTH_80) 312 max_width = NL80211_CHAN_WIDTH_80; 313 314 if (uc.width == max_width) 315 return; 316 /* 317 * Channel usage constrains in the IEEE802.11ac-2013 specification only 318 * allow expanding a 20MHz channel to 80MHz in a single way. In 319 * addition, there are no 40MHz allowed channels that are not part of 320 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here). 321 */ 322 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++) 323 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) { 324 uc.center_freq1 = centers_80mhz[i]; 325 uc.width = NL80211_CHAN_WIDTH_80; 326 break; 327 } 328 329 if (!uc.center_freq1) 330 return; 331 332 /* proceed to downgrade the chandef until usable or the same */ 333 while (uc.width > max_width && 334 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, 335 &uc, sdata->wdev.iftype)) 336 ieee80211_chandef_downgrade(&uc); 337 338 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) { 339 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n", 340 sta->tdls_chandef.width, uc.width); 341 342 /* 343 * the station is not yet authorized when BW upgrade is done, 344 * locking is not required 345 */ 346 sta->tdls_chandef = uc; 347 } 348 } 349 350 static void 351 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata, 352 struct sk_buff *skb, const u8 *peer, 353 u8 action_code, bool initiator, 354 const u8 *extra_ies, size_t extra_ies_len) 355 { 356 enum ieee80211_band band = ieee80211_get_sdata_band(sdata); 357 struct ieee80211_local *local = sdata->local; 358 struct ieee80211_supported_band *sband; 359 struct ieee80211_sta_ht_cap ht_cap; 360 struct ieee80211_sta_vht_cap vht_cap; 361 struct sta_info *sta = NULL; 362 size_t offset = 0, noffset; 363 u8 *pos; 364 365 ieee80211_add_srates_ie(sdata, skb, false, band); 366 ieee80211_add_ext_srates_ie(sdata, skb, false, band); 367 ieee80211_tdls_add_supp_channels(sdata, skb); 368 369 /* add any custom IEs that go before Extended Capabilities */ 370 if (extra_ies_len) { 371 static const u8 before_ext_cap[] = { 372 WLAN_EID_SUPP_RATES, 373 WLAN_EID_COUNTRY, 374 WLAN_EID_EXT_SUPP_RATES, 375 WLAN_EID_SUPPORTED_CHANNELS, 376 WLAN_EID_RSN, 377 }; 378 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 379 before_ext_cap, 380 ARRAY_SIZE(before_ext_cap), 381 offset); 382 pos = skb_put(skb, noffset - offset); 383 memcpy(pos, extra_ies + offset, noffset - offset); 384 offset = noffset; 385 } 386 387 ieee80211_tdls_add_ext_capab(sdata, skb); 388 389 /* add the QoS element if we support it */ 390 if (local->hw.queues >= IEEE80211_NUM_ACS && 391 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) 392 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */ 393 394 /* add any custom IEs that go before HT capabilities */ 395 if (extra_ies_len) { 396 static const u8 before_ht_cap[] = { 397 WLAN_EID_SUPP_RATES, 398 WLAN_EID_COUNTRY, 399 WLAN_EID_EXT_SUPP_RATES, 400 WLAN_EID_SUPPORTED_CHANNELS, 401 WLAN_EID_RSN, 402 WLAN_EID_EXT_CAPABILITY, 403 WLAN_EID_QOS_CAPA, 404 WLAN_EID_FAST_BSS_TRANSITION, 405 WLAN_EID_TIMEOUT_INTERVAL, 406 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 407 }; 408 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 409 before_ht_cap, 410 ARRAY_SIZE(before_ht_cap), 411 offset); 412 pos = skb_put(skb, noffset - offset); 413 memcpy(pos, extra_ies + offset, noffset - offset); 414 offset = noffset; 415 } 416 417 mutex_lock(&local->sta_mtx); 418 419 /* we should have the peer STA if we're already responding */ 420 if (action_code == WLAN_TDLS_SETUP_RESPONSE) { 421 sta = sta_info_get(sdata, peer); 422 if (WARN_ON_ONCE(!sta)) { 423 mutex_unlock(&local->sta_mtx); 424 return; 425 } 426 427 sta->tdls_chandef = sdata->vif.bss_conf.chandef; 428 } 429 430 ieee80211_tdls_add_oper_classes(sdata, skb); 431 432 /* 433 * with TDLS we can switch channels, and HT-caps are not necessarily 434 * the same on all bands. The specification limits the setup to a 435 * single HT-cap, so use the current band for now. 436 */ 437 sband = local->hw.wiphy->bands[band]; 438 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 439 440 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 441 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 442 ht_cap.ht_supported) { 443 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 444 445 /* disable SMPS in TDLS initiator */ 446 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED 447 << IEEE80211_HT_CAP_SM_PS_SHIFT; 448 449 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 450 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 451 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 452 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { 453 /* the peer caps are already intersected with our own */ 454 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap)); 455 456 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 457 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 458 } 459 460 if (ht_cap.ht_supported && 461 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 462 ieee80211_tdls_add_bss_coex_ie(skb); 463 464 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 465 466 /* add any custom IEs that go before VHT capabilities */ 467 if (extra_ies_len) { 468 static const u8 before_vht_cap[] = { 469 WLAN_EID_SUPP_RATES, 470 WLAN_EID_COUNTRY, 471 WLAN_EID_EXT_SUPP_RATES, 472 WLAN_EID_SUPPORTED_CHANNELS, 473 WLAN_EID_RSN, 474 WLAN_EID_EXT_CAPABILITY, 475 WLAN_EID_QOS_CAPA, 476 WLAN_EID_FAST_BSS_TRANSITION, 477 WLAN_EID_TIMEOUT_INTERVAL, 478 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 479 WLAN_EID_MULTI_BAND, 480 }; 481 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 482 before_vht_cap, 483 ARRAY_SIZE(before_vht_cap), 484 offset); 485 pos = skb_put(skb, noffset - offset); 486 memcpy(pos, extra_ies + offset, noffset - offset); 487 offset = noffset; 488 } 489 490 /* build the VHT-cap similarly to the HT-cap */ 491 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 492 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 493 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 494 vht_cap.vht_supported) { 495 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 496 497 /* the AID is present only when VHT is implemented */ 498 if (action_code == WLAN_TDLS_SETUP_REQUEST) 499 ieee80211_tdls_add_aid(sdata, skb); 500 501 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 502 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 503 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 504 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) { 505 /* the peer caps are already intersected with our own */ 506 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap)); 507 508 /* the AID is present only when VHT is implemented */ 509 ieee80211_tdls_add_aid(sdata, skb); 510 511 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 512 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 513 514 /* 515 * if both peers support WIDER_BW, we can expand the chandef to 516 * a wider compatible one, up to 80MHz 517 */ 518 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 519 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 520 } 521 522 mutex_unlock(&local->sta_mtx); 523 524 /* add any remaining IEs */ 525 if (extra_ies_len) { 526 noffset = extra_ies_len; 527 pos = skb_put(skb, noffset - offset); 528 memcpy(pos, extra_ies + offset, noffset - offset); 529 } 530 531 } 532 533 static void 534 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata, 535 struct sk_buff *skb, const u8 *peer, 536 bool initiator, const u8 *extra_ies, 537 size_t extra_ies_len) 538 { 539 struct ieee80211_local *local = sdata->local; 540 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 541 size_t offset = 0, noffset; 542 struct sta_info *sta, *ap_sta; 543 enum ieee80211_band band = ieee80211_get_sdata_band(sdata); 544 u8 *pos; 545 546 mutex_lock(&local->sta_mtx); 547 548 sta = sta_info_get(sdata, peer); 549 ap_sta = sta_info_get(sdata, ifmgd->bssid); 550 if (WARN_ON_ONCE(!sta || !ap_sta)) { 551 mutex_unlock(&local->sta_mtx); 552 return; 553 } 554 555 sta->tdls_chandef = sdata->vif.bss_conf.chandef; 556 557 /* add any custom IEs that go before the QoS IE */ 558 if (extra_ies_len) { 559 static const u8 before_qos[] = { 560 WLAN_EID_RSN, 561 }; 562 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 563 before_qos, 564 ARRAY_SIZE(before_qos), 565 offset); 566 pos = skb_put(skb, noffset - offset); 567 memcpy(pos, extra_ies + offset, noffset - offset); 568 offset = noffset; 569 } 570 571 /* add the QoS param IE if both the peer and we support it */ 572 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme) 573 ieee80211_tdls_add_wmm_param_ie(sdata, skb); 574 575 /* add any custom IEs that go before HT operation */ 576 if (extra_ies_len) { 577 static const u8 before_ht_op[] = { 578 WLAN_EID_RSN, 579 WLAN_EID_QOS_CAPA, 580 WLAN_EID_FAST_BSS_TRANSITION, 581 WLAN_EID_TIMEOUT_INTERVAL, 582 }; 583 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 584 before_ht_op, 585 ARRAY_SIZE(before_ht_op), 586 offset); 587 pos = skb_put(skb, noffset - offset); 588 memcpy(pos, extra_ies + offset, noffset - offset); 589 offset = noffset; 590 } 591 592 /* if HT support is only added in TDLS, we need an HT-operation IE */ 593 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { 594 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 595 /* send an empty HT operation IE */ 596 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap, 597 &sdata->vif.bss_conf.chandef, 0); 598 } 599 600 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 601 602 /* only include VHT-operation if not on the 2.4GHz band */ 603 if (band != IEEE80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) { 604 /* 605 * if both peers support WIDER_BW, we can expand the chandef to 606 * a wider compatible one, up to 80MHz 607 */ 608 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 609 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 610 611 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 612 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap, 613 &sta->tdls_chandef); 614 } 615 616 mutex_unlock(&local->sta_mtx); 617 618 /* add any remaining IEs */ 619 if (extra_ies_len) { 620 noffset = extra_ies_len; 621 pos = skb_put(skb, noffset - offset); 622 memcpy(pos, extra_ies + offset, noffset - offset); 623 } 624 } 625 626 static void 627 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata, 628 struct sk_buff *skb, const u8 *peer, 629 bool initiator, const u8 *extra_ies, 630 size_t extra_ies_len, u8 oper_class, 631 struct cfg80211_chan_def *chandef) 632 { 633 struct ieee80211_tdls_data *tf; 634 size_t offset = 0, noffset; 635 u8 *pos; 636 637 if (WARN_ON_ONCE(!chandef)) 638 return; 639 640 tf = (void *)skb->data; 641 tf->u.chan_switch_req.target_channel = 642 ieee80211_frequency_to_channel(chandef->chan->center_freq); 643 tf->u.chan_switch_req.oper_class = oper_class; 644 645 if (extra_ies_len) { 646 static const u8 before_lnkie[] = { 647 WLAN_EID_SECONDARY_CHANNEL_OFFSET, 648 }; 649 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 650 before_lnkie, 651 ARRAY_SIZE(before_lnkie), 652 offset); 653 pos = skb_put(skb, noffset - offset); 654 memcpy(pos, extra_ies + offset, noffset - offset); 655 offset = noffset; 656 } 657 658 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 659 660 /* add any remaining IEs */ 661 if (extra_ies_len) { 662 noffset = extra_ies_len; 663 pos = skb_put(skb, noffset - offset); 664 memcpy(pos, extra_ies + offset, noffset - offset); 665 } 666 } 667 668 static void 669 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata, 670 struct sk_buff *skb, const u8 *peer, 671 u16 status_code, bool initiator, 672 const u8 *extra_ies, 673 size_t extra_ies_len) 674 { 675 if (status_code == 0) 676 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 677 678 if (extra_ies_len) 679 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len); 680 } 681 682 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata, 683 struct sk_buff *skb, const u8 *peer, 684 u8 action_code, u16 status_code, 685 bool initiator, const u8 *extra_ies, 686 size_t extra_ies_len, u8 oper_class, 687 struct cfg80211_chan_def *chandef) 688 { 689 switch (action_code) { 690 case WLAN_TDLS_SETUP_REQUEST: 691 case WLAN_TDLS_SETUP_RESPONSE: 692 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 693 if (status_code == 0) 694 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer, 695 action_code, 696 initiator, 697 extra_ies, 698 extra_ies_len); 699 break; 700 case WLAN_TDLS_SETUP_CONFIRM: 701 if (status_code == 0) 702 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer, 703 initiator, extra_ies, 704 extra_ies_len); 705 break; 706 case WLAN_TDLS_TEARDOWN: 707 case WLAN_TDLS_DISCOVERY_REQUEST: 708 if (extra_ies_len) 709 memcpy(skb_put(skb, extra_ies_len), extra_ies, 710 extra_ies_len); 711 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN) 712 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 713 break; 714 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 715 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer, 716 initiator, extra_ies, 717 extra_ies_len, 718 oper_class, chandef); 719 break; 720 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 721 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer, 722 status_code, 723 initiator, extra_ies, 724 extra_ies_len); 725 break; 726 } 727 728 } 729 730 static int 731 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev, 732 const u8 *peer, u8 action_code, u8 dialog_token, 733 u16 status_code, struct sk_buff *skb) 734 { 735 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 736 struct ieee80211_tdls_data *tf; 737 738 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u)); 739 740 memcpy(tf->da, peer, ETH_ALEN); 741 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN); 742 tf->ether_type = cpu_to_be16(ETH_P_TDLS); 743 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE; 744 745 /* network header is after the ethernet header */ 746 skb_set_network_header(skb, ETH_HLEN); 747 748 switch (action_code) { 749 case WLAN_TDLS_SETUP_REQUEST: 750 tf->category = WLAN_CATEGORY_TDLS; 751 tf->action_code = WLAN_TDLS_SETUP_REQUEST; 752 753 skb_put(skb, sizeof(tf->u.setup_req)); 754 tf->u.setup_req.dialog_token = dialog_token; 755 tf->u.setup_req.capability = 756 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 757 status_code)); 758 break; 759 case WLAN_TDLS_SETUP_RESPONSE: 760 tf->category = WLAN_CATEGORY_TDLS; 761 tf->action_code = WLAN_TDLS_SETUP_RESPONSE; 762 763 skb_put(skb, sizeof(tf->u.setup_resp)); 764 tf->u.setup_resp.status_code = cpu_to_le16(status_code); 765 tf->u.setup_resp.dialog_token = dialog_token; 766 tf->u.setup_resp.capability = 767 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 768 status_code)); 769 break; 770 case WLAN_TDLS_SETUP_CONFIRM: 771 tf->category = WLAN_CATEGORY_TDLS; 772 tf->action_code = WLAN_TDLS_SETUP_CONFIRM; 773 774 skb_put(skb, sizeof(tf->u.setup_cfm)); 775 tf->u.setup_cfm.status_code = cpu_to_le16(status_code); 776 tf->u.setup_cfm.dialog_token = dialog_token; 777 break; 778 case WLAN_TDLS_TEARDOWN: 779 tf->category = WLAN_CATEGORY_TDLS; 780 tf->action_code = WLAN_TDLS_TEARDOWN; 781 782 skb_put(skb, sizeof(tf->u.teardown)); 783 tf->u.teardown.reason_code = cpu_to_le16(status_code); 784 break; 785 case WLAN_TDLS_DISCOVERY_REQUEST: 786 tf->category = WLAN_CATEGORY_TDLS; 787 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST; 788 789 skb_put(skb, sizeof(tf->u.discover_req)); 790 tf->u.discover_req.dialog_token = dialog_token; 791 break; 792 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 793 tf->category = WLAN_CATEGORY_TDLS; 794 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 795 796 skb_put(skb, sizeof(tf->u.chan_switch_req)); 797 break; 798 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 799 tf->category = WLAN_CATEGORY_TDLS; 800 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 801 802 skb_put(skb, sizeof(tf->u.chan_switch_resp)); 803 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code); 804 break; 805 default: 806 return -EINVAL; 807 } 808 809 return 0; 810 } 811 812 static int 813 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev, 814 const u8 *peer, u8 action_code, u8 dialog_token, 815 u16 status_code, struct sk_buff *skb) 816 { 817 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 818 struct ieee80211_mgmt *mgmt; 819 820 mgmt = (void *)skb_put(skb, 24); 821 memset(mgmt, 0, 24); 822 memcpy(mgmt->da, peer, ETH_ALEN); 823 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 824 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 825 826 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 827 IEEE80211_STYPE_ACTION); 828 829 switch (action_code) { 830 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 831 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp)); 832 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC; 833 mgmt->u.action.u.tdls_discover_resp.action_code = 834 WLAN_PUB_ACTION_TDLS_DISCOVER_RES; 835 mgmt->u.action.u.tdls_discover_resp.dialog_token = 836 dialog_token; 837 mgmt->u.action.u.tdls_discover_resp.capability = 838 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 839 status_code)); 840 break; 841 default: 842 return -EINVAL; 843 } 844 845 return 0; 846 } 847 848 static struct sk_buff * 849 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata, 850 const u8 *peer, u8 action_code, 851 u8 dialog_token, u16 status_code, 852 bool initiator, const u8 *extra_ies, 853 size_t extra_ies_len, u8 oper_class, 854 struct cfg80211_chan_def *chandef) 855 { 856 struct ieee80211_local *local = sdata->local; 857 struct sk_buff *skb; 858 int ret; 859 860 skb = netdev_alloc_skb(sdata->dev, 861 local->hw.extra_tx_headroom + 862 max(sizeof(struct ieee80211_mgmt), 863 sizeof(struct ieee80211_tdls_data)) + 864 50 + /* supported rates */ 865 10 + /* ext capab */ 866 26 + /* max(WMM-info, WMM-param) */ 867 2 + max(sizeof(struct ieee80211_ht_cap), 868 sizeof(struct ieee80211_ht_operation)) + 869 2 + max(sizeof(struct ieee80211_vht_cap), 870 sizeof(struct ieee80211_vht_operation)) + 871 50 + /* supported channels */ 872 3 + /* 40/20 BSS coex */ 873 4 + /* AID */ 874 4 + /* oper classes */ 875 extra_ies_len + 876 sizeof(struct ieee80211_tdls_lnkie)); 877 if (!skb) 878 return NULL; 879 880 skb_reserve(skb, local->hw.extra_tx_headroom); 881 882 switch (action_code) { 883 case WLAN_TDLS_SETUP_REQUEST: 884 case WLAN_TDLS_SETUP_RESPONSE: 885 case WLAN_TDLS_SETUP_CONFIRM: 886 case WLAN_TDLS_TEARDOWN: 887 case WLAN_TDLS_DISCOVERY_REQUEST: 888 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 889 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 890 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy, 891 sdata->dev, peer, 892 action_code, dialog_token, 893 status_code, skb); 894 break; 895 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 896 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev, 897 peer, action_code, 898 dialog_token, status_code, 899 skb); 900 break; 901 default: 902 ret = -ENOTSUPP; 903 break; 904 } 905 906 if (ret < 0) 907 goto fail; 908 909 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code, 910 initiator, extra_ies, extra_ies_len, oper_class, 911 chandef); 912 return skb; 913 914 fail: 915 dev_kfree_skb(skb); 916 return NULL; 917 } 918 919 static int 920 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, 921 const u8 *peer, u8 action_code, u8 dialog_token, 922 u16 status_code, u32 peer_capability, 923 bool initiator, const u8 *extra_ies, 924 size_t extra_ies_len, u8 oper_class, 925 struct cfg80211_chan_def *chandef) 926 { 927 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 928 struct sk_buff *skb = NULL; 929 struct sta_info *sta; 930 u32 flags = 0; 931 int ret = 0; 932 933 rcu_read_lock(); 934 sta = sta_info_get(sdata, peer); 935 936 /* infer the initiator if we can, to support old userspace */ 937 switch (action_code) { 938 case WLAN_TDLS_SETUP_REQUEST: 939 if (sta) { 940 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 941 sta->sta.tdls_initiator = false; 942 } 943 /* fall-through */ 944 case WLAN_TDLS_SETUP_CONFIRM: 945 case WLAN_TDLS_DISCOVERY_REQUEST: 946 initiator = true; 947 break; 948 case WLAN_TDLS_SETUP_RESPONSE: 949 /* 950 * In some testing scenarios, we send a request and response. 951 * Make the last packet sent take effect for the initiator 952 * value. 953 */ 954 if (sta) { 955 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 956 sta->sta.tdls_initiator = true; 957 } 958 /* fall-through */ 959 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 960 initiator = false; 961 break; 962 case WLAN_TDLS_TEARDOWN: 963 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 964 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 965 /* any value is ok */ 966 break; 967 default: 968 ret = -ENOTSUPP; 969 break; 970 } 971 972 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR)) 973 initiator = true; 974 975 rcu_read_unlock(); 976 if (ret < 0) 977 goto fail; 978 979 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code, 980 dialog_token, status_code, 981 initiator, extra_ies, 982 extra_ies_len, oper_class, 983 chandef); 984 if (!skb) { 985 ret = -EINVAL; 986 goto fail; 987 } 988 989 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { 990 ieee80211_tx_skb(sdata, skb); 991 return 0; 992 } 993 994 /* 995 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise 996 * we should default to AC_VI. 997 */ 998 switch (action_code) { 999 case WLAN_TDLS_SETUP_REQUEST: 1000 case WLAN_TDLS_SETUP_RESPONSE: 1001 skb_set_queue_mapping(skb, IEEE80211_AC_BK); 1002 skb->priority = 2; 1003 break; 1004 default: 1005 skb_set_queue_mapping(skb, IEEE80211_AC_VI); 1006 skb->priority = 5; 1007 break; 1008 } 1009 1010 /* 1011 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress. 1012 * Later, if no ACK is returned from peer, we will re-send the teardown 1013 * packet through the AP. 1014 */ 1015 if ((action_code == WLAN_TDLS_TEARDOWN) && 1016 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 1017 bool try_resend; /* Should we keep skb for possible resend */ 1018 1019 /* If not sending directly to peer - no point in keeping skb */ 1020 rcu_read_lock(); 1021 sta = sta_info_get(sdata, peer); 1022 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1023 rcu_read_unlock(); 1024 1025 spin_lock_bh(&sdata->u.mgd.teardown_lock); 1026 if (try_resend && !sdata->u.mgd.teardown_skb) { 1027 /* Mark it as requiring TX status callback */ 1028 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 1029 IEEE80211_TX_INTFL_MLME_CONN_TX; 1030 1031 /* 1032 * skb is copied since mac80211 will later set 1033 * properties that might not be the same as the AP, 1034 * such as encryption, QoS, addresses, etc. 1035 * 1036 * No problem if skb_copy() fails, so no need to check. 1037 */ 1038 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC); 1039 sdata->u.mgd.orig_teardown_skb = skb; 1040 } 1041 spin_unlock_bh(&sdata->u.mgd.teardown_lock); 1042 } 1043 1044 /* disable bottom halves when entering the Tx path */ 1045 local_bh_disable(); 1046 __ieee80211_subif_start_xmit(skb, dev, flags); 1047 local_bh_enable(); 1048 1049 return ret; 1050 1051 fail: 1052 dev_kfree_skb(skb); 1053 return ret; 1054 } 1055 1056 static int 1057 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, 1058 const u8 *peer, u8 action_code, u8 dialog_token, 1059 u16 status_code, u32 peer_capability, bool initiator, 1060 const u8 *extra_ies, size_t extra_ies_len) 1061 { 1062 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1063 struct ieee80211_local *local = sdata->local; 1064 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode; 1065 int ret; 1066 1067 /* don't support setup with forced SMPS mode that's not off */ 1068 if (smps_mode != IEEE80211_SMPS_AUTOMATIC && 1069 smps_mode != IEEE80211_SMPS_OFF) { 1070 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n", 1071 smps_mode); 1072 return -ENOTSUPP; 1073 } 1074 1075 mutex_lock(&local->mtx); 1076 1077 /* we don't support concurrent TDLS peer setups */ 1078 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && 1079 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1080 ret = -EBUSY; 1081 goto out_unlock; 1082 } 1083 1084 /* 1085 * make sure we have a STA representing the peer so we drop or buffer 1086 * non-TDLS-setup frames to the peer. We can't send other packets 1087 * during setup through the AP path. 1088 * Allow error packets to be sent - sometimes we don't even add a STA 1089 * before failing the setup. 1090 */ 1091 if (status_code == 0) { 1092 rcu_read_lock(); 1093 if (!sta_info_get(sdata, peer)) { 1094 rcu_read_unlock(); 1095 ret = -ENOLINK; 1096 goto out_unlock; 1097 } 1098 rcu_read_unlock(); 1099 } 1100 1101 ieee80211_flush_queues(local, sdata, false); 1102 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); 1103 mutex_unlock(&local->mtx); 1104 1105 /* we cannot take the mutex while preparing the setup packet */ 1106 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1107 dialog_token, status_code, 1108 peer_capability, initiator, 1109 extra_ies, extra_ies_len, 0, 1110 NULL); 1111 if (ret < 0) { 1112 mutex_lock(&local->mtx); 1113 eth_zero_addr(sdata->u.mgd.tdls_peer); 1114 mutex_unlock(&local->mtx); 1115 return ret; 1116 } 1117 1118 ieee80211_queue_delayed_work(&sdata->local->hw, 1119 &sdata->u.mgd.tdls_peer_del_work, 1120 TDLS_PEER_SETUP_TIMEOUT); 1121 return 0; 1122 1123 out_unlock: 1124 mutex_unlock(&local->mtx); 1125 return ret; 1126 } 1127 1128 static int 1129 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, 1130 const u8 *peer, u8 action_code, u8 dialog_token, 1131 u16 status_code, u32 peer_capability, 1132 bool initiator, const u8 *extra_ies, 1133 size_t extra_ies_len) 1134 { 1135 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1136 struct ieee80211_local *local = sdata->local; 1137 struct sta_info *sta; 1138 int ret; 1139 1140 /* 1141 * No packets can be transmitted to the peer via the AP during setup - 1142 * the STA is set as a TDLS peer, but is not authorized. 1143 * During teardown, we prevent direct transmissions by stopping the 1144 * queues and flushing all direct packets. 1145 */ 1146 ieee80211_stop_vif_queues(local, sdata, 1147 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1148 ieee80211_flush_queues(local, sdata, false); 1149 1150 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1151 dialog_token, status_code, 1152 peer_capability, initiator, 1153 extra_ies, extra_ies_len, 0, 1154 NULL); 1155 if (ret < 0) 1156 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", 1157 ret); 1158 1159 /* 1160 * Remove the STA AUTH flag to force further traffic through the AP. If 1161 * the STA was unreachable, it was already removed. 1162 */ 1163 rcu_read_lock(); 1164 sta = sta_info_get(sdata, peer); 1165 if (sta) 1166 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1167 rcu_read_unlock(); 1168 1169 ieee80211_wake_vif_queues(local, sdata, 1170 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1171 1172 return 0; 1173 } 1174 1175 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 1176 const u8 *peer, u8 action_code, u8 dialog_token, 1177 u16 status_code, u32 peer_capability, 1178 bool initiator, const u8 *extra_ies, 1179 size_t extra_ies_len) 1180 { 1181 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1182 int ret; 1183 1184 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1185 return -ENOTSUPP; 1186 1187 /* make sure we are in managed mode, and associated */ 1188 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1189 !sdata->u.mgd.associated) 1190 return -EINVAL; 1191 1192 switch (action_code) { 1193 case WLAN_TDLS_SETUP_REQUEST: 1194 case WLAN_TDLS_SETUP_RESPONSE: 1195 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code, 1196 dialog_token, status_code, 1197 peer_capability, initiator, 1198 extra_ies, extra_ies_len); 1199 break; 1200 case WLAN_TDLS_TEARDOWN: 1201 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, 1202 action_code, dialog_token, 1203 status_code, 1204 peer_capability, initiator, 1205 extra_ies, extra_ies_len); 1206 break; 1207 case WLAN_TDLS_DISCOVERY_REQUEST: 1208 /* 1209 * Protect the discovery so we can hear the TDLS discovery 1210 * response frame. It is transmitted directly and not buffered 1211 * by the AP. 1212 */ 1213 drv_mgd_protect_tdls_discover(sdata->local, sdata); 1214 /* fall-through */ 1215 case WLAN_TDLS_SETUP_CONFIRM: 1216 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1217 /* no special handling */ 1218 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1219 action_code, 1220 dialog_token, 1221 status_code, 1222 peer_capability, 1223 initiator, extra_ies, 1224 extra_ies_len, 0, NULL); 1225 break; 1226 default: 1227 ret = -EOPNOTSUPP; 1228 break; 1229 } 1230 1231 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n", 1232 action_code, peer, ret); 1233 return ret; 1234 } 1235 1236 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata) 1237 { 1238 struct ieee80211_local *local = sdata->local; 1239 struct ieee80211_chanctx_conf *conf; 1240 struct ieee80211_chanctx *ctx; 1241 1242 mutex_lock(&local->chanctx_mtx); 1243 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1244 lockdep_is_held(&local->chanctx_mtx)); 1245 if (conf) { 1246 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1247 ieee80211_recalc_chanctx_chantype(local, ctx); 1248 } 1249 mutex_unlock(&local->chanctx_mtx); 1250 } 1251 1252 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata) 1253 { 1254 struct sta_info *sta; 1255 bool result = false; 1256 1257 rcu_read_lock(); 1258 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1259 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1260 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 1261 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) || 1262 !sta->sta.ht_cap.ht_supported) 1263 continue; 1264 result = true; 1265 break; 1266 } 1267 rcu_read_unlock(); 1268 1269 return result; 1270 } 1271 1272 static void 1273 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata, 1274 struct sta_info *sta) 1275 { 1276 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1277 bool tdls_ht; 1278 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 1279 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 1280 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 1281 u16 opmode; 1282 1283 /* Nothing to do if the BSS connection uses HT */ 1284 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 1285 return; 1286 1287 tdls_ht = (sta && sta->sta.ht_cap.ht_supported) || 1288 iee80211_tdls_have_ht_peers(sdata); 1289 1290 opmode = sdata->vif.bss_conf.ht_operation_mode; 1291 1292 if (tdls_ht) 1293 opmode |= protection; 1294 else 1295 opmode &= ~protection; 1296 1297 if (opmode == sdata->vif.bss_conf.ht_operation_mode) 1298 return; 1299 1300 sdata->vif.bss_conf.ht_operation_mode = opmode; 1301 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT); 1302 } 1303 1304 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 1305 const u8 *peer, enum nl80211_tdls_operation oper) 1306 { 1307 struct sta_info *sta; 1308 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1309 struct ieee80211_local *local = sdata->local; 1310 int ret; 1311 1312 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1313 return -ENOTSUPP; 1314 1315 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1316 return -EINVAL; 1317 1318 switch (oper) { 1319 case NL80211_TDLS_ENABLE_LINK: 1320 case NL80211_TDLS_DISABLE_LINK: 1321 break; 1322 case NL80211_TDLS_TEARDOWN: 1323 case NL80211_TDLS_SETUP: 1324 case NL80211_TDLS_DISCOVERY_REQ: 1325 /* We don't support in-driver setup/teardown/discovery */ 1326 return -ENOTSUPP; 1327 } 1328 1329 /* protect possible bss_conf changes and avoid concurrency in 1330 * ieee80211_bss_info_change_notify() 1331 */ 1332 sdata_lock(sdata); 1333 mutex_lock(&local->mtx); 1334 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); 1335 1336 switch (oper) { 1337 case NL80211_TDLS_ENABLE_LINK: 1338 if (sdata->vif.csa_active) { 1339 tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); 1340 ret = -EBUSY; 1341 break; 1342 } 1343 1344 iee80211_tdls_recalc_chanctx(sdata); 1345 1346 mutex_lock(&local->sta_mtx); 1347 sta = sta_info_get(sdata, peer); 1348 if (!sta) { 1349 mutex_unlock(&local->sta_mtx); 1350 ret = -ENOLINK; 1351 break; 1352 } 1353 1354 iee80211_tdls_recalc_ht_protection(sdata, sta); 1355 1356 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1357 mutex_unlock(&local->sta_mtx); 1358 1359 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || 1360 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); 1361 ret = 0; 1362 break; 1363 case NL80211_TDLS_DISABLE_LINK: 1364 /* 1365 * The teardown message in ieee80211_tdls_mgmt_teardown() was 1366 * created while the queues were stopped, so it might still be 1367 * pending. Before flushing the queues we need to be sure the 1368 * message is handled by the tasklet handling pending messages, 1369 * otherwise we might start destroying the station before 1370 * sending the teardown packet. 1371 * Note that this only forces the tasklet to flush pendings - 1372 * not to stop the tasklet from rescheduling itself. 1373 */ 1374 tasklet_kill(&local->tx_pending_tasklet); 1375 /* flush a potentially queued teardown packet */ 1376 ieee80211_flush_queues(local, sdata, false); 1377 1378 ret = sta_info_destroy_addr(sdata, peer); 1379 1380 mutex_lock(&local->sta_mtx); 1381 iee80211_tdls_recalc_ht_protection(sdata, NULL); 1382 mutex_unlock(&local->sta_mtx); 1383 1384 iee80211_tdls_recalc_chanctx(sdata); 1385 break; 1386 default: 1387 ret = -ENOTSUPP; 1388 break; 1389 } 1390 1391 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1392 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work); 1393 eth_zero_addr(sdata->u.mgd.tdls_peer); 1394 } 1395 1396 if (ret == 0) 1397 ieee80211_queue_work(&sdata->local->hw, 1398 &sdata->u.mgd.request_smps_work); 1399 1400 mutex_unlock(&local->mtx); 1401 sdata_unlock(sdata); 1402 return ret; 1403 } 1404 1405 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, 1406 enum nl80211_tdls_operation oper, 1407 u16 reason_code, gfp_t gfp) 1408 { 1409 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1410 1411 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) { 1412 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", 1413 oper); 1414 return; 1415 } 1416 1417 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); 1418 } 1419 EXPORT_SYMBOL(ieee80211_tdls_oper_request); 1420 1421 static void 1422 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) 1423 { 1424 struct ieee80211_ch_switch_timing *ch_sw; 1425 1426 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; 1427 *buf++ = sizeof(struct ieee80211_ch_switch_timing); 1428 1429 ch_sw = (void *)buf; 1430 ch_sw->switch_time = cpu_to_le16(switch_time); 1431 ch_sw->switch_timeout = cpu_to_le16(switch_timeout); 1432 } 1433 1434 /* find switch timing IE in SKB ready for Tx */ 1435 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) 1436 { 1437 struct ieee80211_tdls_data *tf; 1438 const u8 *ie_start; 1439 1440 /* 1441 * Get the offset for the new location of the switch timing IE. 1442 * The SKB network header will now point to the "payload_type" 1443 * element of the TDLS data frame struct. 1444 */ 1445 tf = container_of(skb->data + skb_network_offset(skb), 1446 struct ieee80211_tdls_data, payload_type); 1447 ie_start = tf->u.chan_switch_req.variable; 1448 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, 1449 skb->len - (ie_start - skb->data)); 1450 } 1451 1452 static struct sk_buff * 1453 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, 1454 struct cfg80211_chan_def *chandef, 1455 u32 *ch_sw_tm_ie_offset) 1456 { 1457 struct ieee80211_sub_if_data *sdata = sta->sdata; 1458 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 1459 2 + sizeof(struct ieee80211_ch_switch_timing)]; 1460 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); 1461 u8 *pos = extra_ies; 1462 struct sk_buff *skb; 1463 1464 /* 1465 * if chandef points to a wide channel add a Secondary-Channel 1466 * Offset information element 1467 */ 1468 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1469 struct ieee80211_sec_chan_offs_ie *sec_chan_ie; 1470 bool ht40plus; 1471 1472 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 1473 *pos++ = sizeof(*sec_chan_ie); 1474 sec_chan_ie = (void *)pos; 1475 1476 ht40plus = cfg80211_get_chandef_type(chandef) == 1477 NL80211_CHAN_HT40PLUS; 1478 sec_chan_ie->sec_chan_offs = ht40plus ? 1479 IEEE80211_HT_PARAM_CHA_SEC_ABOVE : 1480 IEEE80211_HT_PARAM_CHA_SEC_BELOW; 1481 pos += sizeof(*sec_chan_ie); 1482 1483 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 1484 } 1485 1486 /* just set the values to 0, this is a template */ 1487 iee80211_tdls_add_ch_switch_timing(pos, 0, 0); 1488 1489 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1490 WLAN_TDLS_CHANNEL_SWITCH_REQUEST, 1491 0, 0, !sta->sta.tdls_initiator, 1492 extra_ies, extra_ies_len, 1493 oper_class, chandef); 1494 if (!skb) 1495 return NULL; 1496 1497 skb = ieee80211_build_data_template(sdata, skb, 0); 1498 if (IS_ERR(skb)) { 1499 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); 1500 return NULL; 1501 } 1502 1503 if (ch_sw_tm_ie_offset) { 1504 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1505 1506 if (!tm_ie) { 1507 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); 1508 dev_kfree_skb_any(skb); 1509 return NULL; 1510 } 1511 1512 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1513 } 1514 1515 tdls_dbg(sdata, 1516 "TDLS channel switch request template for %pM ch %d width %d\n", 1517 sta->sta.addr, chandef->chan->center_freq, chandef->width); 1518 return skb; 1519 } 1520 1521 int 1522 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, 1523 const u8 *addr, u8 oper_class, 1524 struct cfg80211_chan_def *chandef) 1525 { 1526 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1527 struct ieee80211_local *local = sdata->local; 1528 struct sta_info *sta; 1529 struct sk_buff *skb = NULL; 1530 u32 ch_sw_tm_ie; 1531 int ret; 1532 1533 mutex_lock(&local->sta_mtx); 1534 sta = sta_info_get(sdata, addr); 1535 if (!sta) { 1536 tdls_dbg(sdata, 1537 "Invalid TDLS peer %pM for channel switch request\n", 1538 addr); 1539 ret = -ENOENT; 1540 goto out; 1541 } 1542 1543 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { 1544 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", 1545 addr); 1546 ret = -ENOTSUPP; 1547 goto out; 1548 } 1549 1550 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, 1551 &ch_sw_tm_ie); 1552 if (!skb) { 1553 ret = -ENOENT; 1554 goto out; 1555 } 1556 1557 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, 1558 chandef, skb, ch_sw_tm_ie); 1559 if (!ret) 1560 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1561 1562 out: 1563 mutex_unlock(&local->sta_mtx); 1564 dev_kfree_skb_any(skb); 1565 return ret; 1566 } 1567 1568 void 1569 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, 1570 struct net_device *dev, 1571 const u8 *addr) 1572 { 1573 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1574 struct ieee80211_local *local = sdata->local; 1575 struct sta_info *sta; 1576 1577 mutex_lock(&local->sta_mtx); 1578 sta = sta_info_get(sdata, addr); 1579 if (!sta) { 1580 tdls_dbg(sdata, 1581 "Invalid TDLS peer %pM for channel switch cancel\n", 1582 addr); 1583 goto out; 1584 } 1585 1586 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 1587 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", 1588 addr); 1589 goto out; 1590 } 1591 1592 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 1593 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1594 1595 out: 1596 mutex_unlock(&local->sta_mtx); 1597 } 1598 1599 static struct sk_buff * 1600 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, 1601 u32 *ch_sw_tm_ie_offset) 1602 { 1603 struct ieee80211_sub_if_data *sdata = sta->sdata; 1604 struct sk_buff *skb; 1605 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; 1606 1607 /* initial timing are always zero in the template */ 1608 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); 1609 1610 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1611 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, 1612 0, 0, !sta->sta.tdls_initiator, 1613 extra_ies, sizeof(extra_ies), 0, NULL); 1614 if (!skb) 1615 return NULL; 1616 1617 skb = ieee80211_build_data_template(sdata, skb, 0); 1618 if (IS_ERR(skb)) { 1619 tdls_dbg(sdata, 1620 "Failed building TDLS channel switch resp frame\n"); 1621 return NULL; 1622 } 1623 1624 if (ch_sw_tm_ie_offset) { 1625 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1626 1627 if (!tm_ie) { 1628 tdls_dbg(sdata, 1629 "No switch timing IE in TDLS switch resp\n"); 1630 dev_kfree_skb_any(skb); 1631 return NULL; 1632 } 1633 1634 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1635 } 1636 1637 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", 1638 sta->sta.addr); 1639 return skb; 1640 } 1641 1642 static int 1643 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, 1644 struct sk_buff *skb) 1645 { 1646 struct ieee80211_local *local = sdata->local; 1647 struct ieee802_11_elems elems; 1648 struct sta_info *sta; 1649 struct ieee80211_tdls_data *tf = (void *)skb->data; 1650 bool local_initiator; 1651 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1652 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); 1653 struct ieee80211_tdls_ch_sw_params params = {}; 1654 int ret; 1655 1656 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 1657 params.timestamp = rx_status->device_timestamp; 1658 1659 if (skb->len < baselen) { 1660 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", 1661 skb->len); 1662 return -EINVAL; 1663 } 1664 1665 mutex_lock(&local->sta_mtx); 1666 sta = sta_info_get(sdata, tf->sa); 1667 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1668 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1669 tf->sa); 1670 ret = -EINVAL; 1671 goto out; 1672 } 1673 1674 params.sta = &sta->sta; 1675 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); 1676 if (params.status != 0) { 1677 ret = 0; 1678 goto call_drv; 1679 } 1680 1681 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, 1682 skb->len - baselen, false, &elems); 1683 if (elems.parse_error) { 1684 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); 1685 ret = -EINVAL; 1686 goto out; 1687 } 1688 1689 if (!elems.ch_sw_timing || !elems.lnk_id) { 1690 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); 1691 ret = -EINVAL; 1692 goto out; 1693 } 1694 1695 /* validate the initiator is set correctly */ 1696 local_initiator = 1697 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1698 if (local_initiator == sta->sta.tdls_initiator) { 1699 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1700 ret = -EINVAL; 1701 goto out; 1702 } 1703 1704 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); 1705 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); 1706 1707 params.tmpl_skb = 1708 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); 1709 if (!params.tmpl_skb) { 1710 ret = -ENOENT; 1711 goto out; 1712 } 1713 1714 call_drv: 1715 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1716 1717 tdls_dbg(sdata, 1718 "TDLS channel switch response received from %pM status %d\n", 1719 tf->sa, params.status); 1720 1721 out: 1722 mutex_unlock(&local->sta_mtx); 1723 dev_kfree_skb_any(params.tmpl_skb); 1724 return ret; 1725 } 1726 1727 static int 1728 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, 1729 struct sk_buff *skb) 1730 { 1731 struct ieee80211_local *local = sdata->local; 1732 struct ieee802_11_elems elems; 1733 struct cfg80211_chan_def chandef; 1734 struct ieee80211_channel *chan; 1735 enum nl80211_channel_type chan_type; 1736 int freq; 1737 u8 target_channel, oper_class; 1738 bool local_initiator; 1739 struct sta_info *sta; 1740 enum ieee80211_band band; 1741 struct ieee80211_tdls_data *tf = (void *)skb->data; 1742 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1743 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); 1744 struct ieee80211_tdls_ch_sw_params params = {}; 1745 int ret = 0; 1746 1747 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 1748 params.timestamp = rx_status->device_timestamp; 1749 1750 if (skb->len < baselen) { 1751 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", 1752 skb->len); 1753 return -EINVAL; 1754 } 1755 1756 target_channel = tf->u.chan_switch_req.target_channel; 1757 oper_class = tf->u.chan_switch_req.oper_class; 1758 1759 /* 1760 * We can't easily infer the channel band. The operating class is 1761 * ambiguous - there are multiple tables (US/Europe/JP/Global). The 1762 * solution here is to treat channels with number >14 as 5GHz ones, 1763 * and specifically check for the (oper_class, channel) combinations 1764 * where this doesn't hold. These are thankfully unique according to 1765 * IEEE802.11-2012. 1766 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as 1767 * valid here. 1768 */ 1769 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || 1770 oper_class == 4 || oper_class == 5 || oper_class == 6) && 1771 target_channel < 14) 1772 band = IEEE80211_BAND_5GHZ; 1773 else 1774 band = target_channel < 14 ? IEEE80211_BAND_2GHZ : 1775 IEEE80211_BAND_5GHZ; 1776 1777 freq = ieee80211_channel_to_frequency(target_channel, band); 1778 if (freq == 0) { 1779 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", 1780 target_channel); 1781 return -EINVAL; 1782 } 1783 1784 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 1785 if (!chan) { 1786 tdls_dbg(sdata, 1787 "Unsupported channel for TDLS chan switch: %d\n", 1788 target_channel); 1789 return -EINVAL; 1790 } 1791 1792 ieee802_11_parse_elems(tf->u.chan_switch_req.variable, 1793 skb->len - baselen, false, &elems); 1794 if (elems.parse_error) { 1795 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); 1796 return -EINVAL; 1797 } 1798 1799 if (!elems.ch_sw_timing || !elems.lnk_id) { 1800 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); 1801 return -EINVAL; 1802 } 1803 1804 if (!elems.sec_chan_offs) { 1805 chan_type = NL80211_CHAN_HT20; 1806 } else { 1807 switch (elems.sec_chan_offs->sec_chan_offs) { 1808 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 1809 chan_type = NL80211_CHAN_HT40PLUS; 1810 break; 1811 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 1812 chan_type = NL80211_CHAN_HT40MINUS; 1813 break; 1814 default: 1815 chan_type = NL80211_CHAN_HT20; 1816 break; 1817 } 1818 } 1819 1820 cfg80211_chandef_create(&chandef, chan, chan_type); 1821 1822 /* we will be active on the TDLS link */ 1823 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, 1824 sdata->wdev.iftype)) { 1825 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); 1826 return -EINVAL; 1827 } 1828 1829 mutex_lock(&local->sta_mtx); 1830 sta = sta_info_get(sdata, tf->sa); 1831 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1832 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1833 tf->sa); 1834 ret = -EINVAL; 1835 goto out; 1836 } 1837 1838 params.sta = &sta->sta; 1839 1840 /* validate the initiator is set correctly */ 1841 local_initiator = 1842 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1843 if (local_initiator == sta->sta.tdls_initiator) { 1844 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1845 ret = -EINVAL; 1846 goto out; 1847 } 1848 1849 /* peer should have known better */ 1850 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs && 1851 elems.sec_chan_offs->sec_chan_offs) { 1852 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); 1853 ret = -ENOTSUPP; 1854 goto out; 1855 } 1856 1857 params.chandef = &chandef; 1858 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); 1859 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); 1860 1861 params.tmpl_skb = 1862 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, 1863 ¶ms.ch_sw_tm_ie); 1864 if (!params.tmpl_skb) { 1865 ret = -ENOENT; 1866 goto out; 1867 } 1868 1869 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1870 1871 tdls_dbg(sdata, 1872 "TDLS ch switch request received from %pM ch %d width %d\n", 1873 tf->sa, params.chandef->chan->center_freq, 1874 params.chandef->width); 1875 out: 1876 mutex_unlock(&local->sta_mtx); 1877 dev_kfree_skb_any(params.tmpl_skb); 1878 return ret; 1879 } 1880 1881 static void 1882 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, 1883 struct sk_buff *skb) 1884 { 1885 struct ieee80211_tdls_data *tf = (void *)skb->data; 1886 struct wiphy *wiphy = sdata->local->hw.wiphy; 1887 1888 ASSERT_RTNL(); 1889 1890 /* make sure the driver supports it */ 1891 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) 1892 return; 1893 1894 /* we want to access the entire packet */ 1895 if (skb_linearize(skb)) 1896 return; 1897 /* 1898 * The packet/size was already validated by mac80211 Rx path, only look 1899 * at the action type. 1900 */ 1901 switch (tf->action_code) { 1902 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 1903 ieee80211_process_tdls_channel_switch_req(sdata, skb); 1904 break; 1905 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 1906 ieee80211_process_tdls_channel_switch_resp(sdata, skb); 1907 break; 1908 default: 1909 WARN_ON_ONCE(1); 1910 return; 1911 } 1912 } 1913 1914 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata) 1915 { 1916 struct sta_info *sta; 1917 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 1918 1919 rcu_read_lock(); 1920 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1921 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1922 !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 1923 continue; 1924 1925 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, 1926 NL80211_TDLS_TEARDOWN, reason, 1927 GFP_ATOMIC); 1928 } 1929 rcu_read_unlock(); 1930 } 1931 1932 void ieee80211_tdls_chsw_work(struct work_struct *wk) 1933 { 1934 struct ieee80211_local *local = 1935 container_of(wk, struct ieee80211_local, tdls_chsw_work); 1936 struct ieee80211_sub_if_data *sdata; 1937 struct sk_buff *skb; 1938 struct ieee80211_tdls_data *tf; 1939 1940 rtnl_lock(); 1941 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) { 1942 tf = (struct ieee80211_tdls_data *)skb->data; 1943 list_for_each_entry(sdata, &local->interfaces, list) { 1944 if (!ieee80211_sdata_running(sdata) || 1945 sdata->vif.type != NL80211_IFTYPE_STATION || 1946 !ether_addr_equal(tf->da, sdata->vif.addr)) 1947 continue; 1948 1949 ieee80211_process_tdls_channel_switch(sdata, skb); 1950 break; 1951 } 1952 1953 kfree_skb(skb); 1954 } 1955 rtnl_unlock(); 1956 } 1957