1 /* 2 * mac80211 TDLS handling code 3 * 4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 5 * Copyright 2014, Intel Corporation 6 * Copyright 2014 Intel Mobile Communications GmbH 7 * Copyright 2015 - 2016 Intel Deutschland GmbH 8 * 9 * This file is GPLv2 as found in COPYING. 10 */ 11 12 #include <linux/ieee80211.h> 13 #include <linux/log2.h> 14 #include <net/cfg80211.h> 15 #include <linux/rtnetlink.h> 16 #include "ieee80211_i.h" 17 #include "driver-ops.h" 18 #include "rate.h" 19 20 /* give usermode some time for retries in setting up the TDLS session */ 21 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ) 22 23 void ieee80211_tdls_peer_del_work(struct work_struct *wk) 24 { 25 struct ieee80211_sub_if_data *sdata; 26 struct ieee80211_local *local; 27 28 sdata = container_of(wk, struct ieee80211_sub_if_data, 29 u.mgd.tdls_peer_del_work.work); 30 local = sdata->local; 31 32 mutex_lock(&local->mtx); 33 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) { 34 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer); 35 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer); 36 eth_zero_addr(sdata->u.mgd.tdls_peer); 37 } 38 mutex_unlock(&local->mtx); 39 } 40 41 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata, 42 struct sk_buff *skb) 43 { 44 struct ieee80211_local *local = sdata->local; 45 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 46 bool chan_switch = local->hw.wiphy->features & 47 NL80211_FEATURE_TDLS_CHANNEL_SWITCH; 48 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) && 49 !ifmgd->tdls_wider_bw_prohibited; 50 enum nl80211_band band = ieee80211_get_sdata_band(sdata); 51 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; 52 bool vht = sband && sband->vht_cap.vht_supported; 53 u8 *pos = (void *)skb_put(skb, 10); 54 55 *pos++ = WLAN_EID_EXT_CAPABILITY; 56 *pos++ = 8; /* len */ 57 *pos++ = 0x0; 58 *pos++ = 0x0; 59 *pos++ = 0x0; 60 *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0; 61 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED; 62 *pos++ = 0; 63 *pos++ = 0; 64 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0; 65 } 66 67 static u8 68 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata, 69 struct sk_buff *skb, u16 start, u16 end, 70 u16 spacing) 71 { 72 u8 subband_cnt = 0, ch_cnt = 0; 73 struct ieee80211_channel *ch; 74 struct cfg80211_chan_def chandef; 75 int i, subband_start; 76 struct wiphy *wiphy = sdata->local->hw.wiphy; 77 78 for (i = start; i <= end; i += spacing) { 79 if (!ch_cnt) 80 subband_start = i; 81 82 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i); 83 if (ch) { 84 /* we will be active on the channel */ 85 cfg80211_chandef_create(&chandef, ch, 86 NL80211_CHAN_NO_HT); 87 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef, 88 sdata->wdev.iftype)) { 89 ch_cnt++; 90 /* 91 * check if the next channel is also part of 92 * this allowed range 93 */ 94 continue; 95 } 96 } 97 98 /* 99 * we've reached the end of a range, with allowed channels 100 * found 101 */ 102 if (ch_cnt) { 103 u8 *pos = skb_put(skb, 2); 104 *pos++ = ieee80211_frequency_to_channel(subband_start); 105 *pos++ = ch_cnt; 106 107 subband_cnt++; 108 ch_cnt = 0; 109 } 110 } 111 112 /* all channels in the requested range are allowed - add them here */ 113 if (ch_cnt) { 114 u8 *pos = skb_put(skb, 2); 115 *pos++ = ieee80211_frequency_to_channel(subband_start); 116 *pos++ = ch_cnt; 117 118 subband_cnt++; 119 } 120 121 return subband_cnt; 122 } 123 124 static void 125 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata, 126 struct sk_buff *skb) 127 { 128 /* 129 * Add possible channels for TDLS. These are channels that are allowed 130 * to be active. 131 */ 132 u8 subband_cnt; 133 u8 *pos = skb_put(skb, 2); 134 135 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 136 137 /* 138 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as 139 * this doesn't happen in real world scenarios. 140 */ 141 142 /* 2GHz, with 5MHz spacing */ 143 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5); 144 145 /* 5GHz, with 20MHz spacing */ 146 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20); 147 148 /* length */ 149 *pos = 2 * subband_cnt; 150 } 151 152 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata, 153 struct sk_buff *skb) 154 { 155 u8 *pos; 156 u8 op_class; 157 158 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef, 159 &op_class)) 160 return; 161 162 pos = skb_put(skb, 4); 163 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES; 164 *pos++ = 2; /* len */ 165 166 *pos++ = op_class; 167 *pos++ = op_class; /* give current operating class as alternate too */ 168 } 169 170 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb) 171 { 172 u8 *pos = (void *)skb_put(skb, 3); 173 174 *pos++ = WLAN_EID_BSS_COEX_2040; 175 *pos++ = 1; /* len */ 176 177 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST; 178 } 179 180 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata, 181 u16 status_code) 182 { 183 /* The capability will be 0 when sending a failure code */ 184 if (status_code != 0) 185 return 0; 186 187 if (ieee80211_get_sdata_band(sdata) == NL80211_BAND_2GHZ) { 188 return WLAN_CAPABILITY_SHORT_SLOT_TIME | 189 WLAN_CAPABILITY_SHORT_PREAMBLE; 190 } 191 192 return 0; 193 } 194 195 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata, 196 struct sk_buff *skb, const u8 *peer, 197 bool initiator) 198 { 199 struct ieee80211_tdls_lnkie *lnkid; 200 const u8 *init_addr, *rsp_addr; 201 202 if (initiator) { 203 init_addr = sdata->vif.addr; 204 rsp_addr = peer; 205 } else { 206 init_addr = peer; 207 rsp_addr = sdata->vif.addr; 208 } 209 210 lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie)); 211 212 lnkid->ie_type = WLAN_EID_LINK_ID; 213 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2; 214 215 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN); 216 memcpy(lnkid->init_sta, init_addr, ETH_ALEN); 217 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN); 218 } 219 220 static void 221 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 222 { 223 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 224 u8 *pos = (void *)skb_put(skb, 4); 225 226 *pos++ = WLAN_EID_AID; 227 *pos++ = 2; /* len */ 228 put_unaligned_le16(ifmgd->aid, pos); 229 } 230 231 /* translate numbering in the WMM parameter IE to the mac80211 notation */ 232 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac) 233 { 234 switch (ac) { 235 default: 236 WARN_ON_ONCE(1); 237 case 0: 238 return IEEE80211_AC_BE; 239 case 1: 240 return IEEE80211_AC_BK; 241 case 2: 242 return IEEE80211_AC_VI; 243 case 3: 244 return IEEE80211_AC_VO; 245 } 246 } 247 248 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci) 249 { 250 u8 ret; 251 252 ret = aifsn & 0x0f; 253 if (acm) 254 ret |= 0x10; 255 ret |= (aci << 5) & 0x60; 256 return ret; 257 } 258 259 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max) 260 { 261 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) | 262 ((ilog2(cw_max + 1) << 0x4) & 0xf0); 263 } 264 265 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata, 266 struct sk_buff *skb) 267 { 268 struct ieee80211_wmm_param_ie *wmm; 269 struct ieee80211_tx_queue_params *txq; 270 int i; 271 272 wmm = (void *)skb_put(skb, sizeof(*wmm)); 273 memset(wmm, 0, sizeof(*wmm)); 274 275 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC; 276 wmm->len = sizeof(*wmm) - 2; 277 278 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */ 279 wmm->oui[1] = 0x50; 280 wmm->oui[2] = 0xf2; 281 wmm->oui_type = 2; /* WME */ 282 wmm->oui_subtype = 1; /* WME param */ 283 wmm->version = 1; /* WME ver */ 284 wmm->qos_info = 0; /* U-APSD not in use */ 285 286 /* 287 * Use the EDCA parameters defined for the BSS, or default if the AP 288 * doesn't support it, as mandated by 802.11-2012 section 10.22.4 289 */ 290 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 291 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)]; 292 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs, 293 txq->acm, i); 294 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max); 295 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop); 296 } 297 } 298 299 static void 300 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata, 301 struct sta_info *sta) 302 { 303 /* IEEE802.11ac-2013 Table E-4 */ 304 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 }; 305 struct cfg80211_chan_def uc = sta->tdls_chandef; 306 enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta); 307 int i; 308 309 /* only support upgrading non-narrow channels up to 80Mhz */ 310 if (max_width == NL80211_CHAN_WIDTH_5 || 311 max_width == NL80211_CHAN_WIDTH_10) 312 return; 313 314 if (max_width > NL80211_CHAN_WIDTH_80) 315 max_width = NL80211_CHAN_WIDTH_80; 316 317 if (uc.width >= max_width) 318 return; 319 /* 320 * Channel usage constrains in the IEEE802.11ac-2013 specification only 321 * allow expanding a 20MHz channel to 80MHz in a single way. In 322 * addition, there are no 40MHz allowed channels that are not part of 323 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here). 324 */ 325 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++) 326 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) { 327 uc.center_freq1 = centers_80mhz[i]; 328 uc.center_freq2 = 0; 329 uc.width = NL80211_CHAN_WIDTH_80; 330 break; 331 } 332 333 if (!uc.center_freq1) 334 return; 335 336 /* proceed to downgrade the chandef until usable or the same as AP BW */ 337 while (uc.width > max_width || 338 (uc.width > sta->tdls_chandef.width && 339 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc, 340 sdata->wdev.iftype))) 341 ieee80211_chandef_downgrade(&uc); 342 343 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) { 344 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n", 345 sta->tdls_chandef.width, uc.width); 346 347 /* 348 * the station is not yet authorized when BW upgrade is done, 349 * locking is not required 350 */ 351 sta->tdls_chandef = uc; 352 } 353 } 354 355 static void 356 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata, 357 struct sk_buff *skb, const u8 *peer, 358 u8 action_code, bool initiator, 359 const u8 *extra_ies, size_t extra_ies_len) 360 { 361 enum nl80211_band band = ieee80211_get_sdata_band(sdata); 362 struct ieee80211_local *local = sdata->local; 363 struct ieee80211_supported_band *sband; 364 struct ieee80211_sta_ht_cap ht_cap; 365 struct ieee80211_sta_vht_cap vht_cap; 366 struct sta_info *sta = NULL; 367 size_t offset = 0, noffset; 368 u8 *pos; 369 370 ieee80211_add_srates_ie(sdata, skb, false, band); 371 ieee80211_add_ext_srates_ie(sdata, skb, false, band); 372 ieee80211_tdls_add_supp_channels(sdata, skb); 373 374 /* add any custom IEs that go before Extended Capabilities */ 375 if (extra_ies_len) { 376 static const u8 before_ext_cap[] = { 377 WLAN_EID_SUPP_RATES, 378 WLAN_EID_COUNTRY, 379 WLAN_EID_EXT_SUPP_RATES, 380 WLAN_EID_SUPPORTED_CHANNELS, 381 WLAN_EID_RSN, 382 }; 383 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 384 before_ext_cap, 385 ARRAY_SIZE(before_ext_cap), 386 offset); 387 pos = skb_put(skb, noffset - offset); 388 memcpy(pos, extra_ies + offset, noffset - offset); 389 offset = noffset; 390 } 391 392 ieee80211_tdls_add_ext_capab(sdata, skb); 393 394 /* add the QoS element if we support it */ 395 if (local->hw.queues >= IEEE80211_NUM_ACS && 396 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) 397 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */ 398 399 /* add any custom IEs that go before HT capabilities */ 400 if (extra_ies_len) { 401 static const u8 before_ht_cap[] = { 402 WLAN_EID_SUPP_RATES, 403 WLAN_EID_COUNTRY, 404 WLAN_EID_EXT_SUPP_RATES, 405 WLAN_EID_SUPPORTED_CHANNELS, 406 WLAN_EID_RSN, 407 WLAN_EID_EXT_CAPABILITY, 408 WLAN_EID_QOS_CAPA, 409 WLAN_EID_FAST_BSS_TRANSITION, 410 WLAN_EID_TIMEOUT_INTERVAL, 411 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 412 }; 413 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 414 before_ht_cap, 415 ARRAY_SIZE(before_ht_cap), 416 offset); 417 pos = skb_put(skb, noffset - offset); 418 memcpy(pos, extra_ies + offset, noffset - offset); 419 offset = noffset; 420 } 421 422 mutex_lock(&local->sta_mtx); 423 424 /* we should have the peer STA if we're already responding */ 425 if (action_code == WLAN_TDLS_SETUP_RESPONSE) { 426 sta = sta_info_get(sdata, peer); 427 if (WARN_ON_ONCE(!sta)) { 428 mutex_unlock(&local->sta_mtx); 429 return; 430 } 431 432 sta->tdls_chandef = sdata->vif.bss_conf.chandef; 433 } 434 435 ieee80211_tdls_add_oper_classes(sdata, skb); 436 437 /* 438 * with TDLS we can switch channels, and HT-caps are not necessarily 439 * the same on all bands. The specification limits the setup to a 440 * single HT-cap, so use the current band for now. 441 */ 442 sband = local->hw.wiphy->bands[band]; 443 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 444 445 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 446 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 447 ht_cap.ht_supported) { 448 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 449 450 /* disable SMPS in TDLS initiator */ 451 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED 452 << IEEE80211_HT_CAP_SM_PS_SHIFT; 453 454 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 455 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 456 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 457 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { 458 /* the peer caps are already intersected with our own */ 459 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap)); 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 } 464 465 if (ht_cap.ht_supported && 466 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 467 ieee80211_tdls_add_bss_coex_ie(skb); 468 469 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 470 471 /* add any custom IEs that go before VHT capabilities */ 472 if (extra_ies_len) { 473 static const u8 before_vht_cap[] = { 474 WLAN_EID_SUPP_RATES, 475 WLAN_EID_COUNTRY, 476 WLAN_EID_EXT_SUPP_RATES, 477 WLAN_EID_SUPPORTED_CHANNELS, 478 WLAN_EID_RSN, 479 WLAN_EID_EXT_CAPABILITY, 480 WLAN_EID_QOS_CAPA, 481 WLAN_EID_FAST_BSS_TRANSITION, 482 WLAN_EID_TIMEOUT_INTERVAL, 483 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 484 WLAN_EID_MULTI_BAND, 485 }; 486 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 487 before_vht_cap, 488 ARRAY_SIZE(before_vht_cap), 489 offset); 490 pos = skb_put(skb, noffset - offset); 491 memcpy(pos, extra_ies + offset, noffset - offset); 492 offset = noffset; 493 } 494 495 /* build the VHT-cap similarly to the HT-cap */ 496 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 497 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 498 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 499 vht_cap.vht_supported) { 500 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 501 502 /* the AID is present only when VHT is implemented */ 503 if (action_code == WLAN_TDLS_SETUP_REQUEST) 504 ieee80211_tdls_add_aid(sdata, skb); 505 506 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 507 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 508 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 509 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) { 510 /* the peer caps are already intersected with our own */ 511 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap)); 512 513 /* the AID is present only when VHT is implemented */ 514 ieee80211_tdls_add_aid(sdata, skb); 515 516 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 517 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 518 519 /* 520 * if both peers support WIDER_BW, we can expand the chandef to 521 * a wider compatible one, up to 80MHz 522 */ 523 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 524 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 525 } 526 527 mutex_unlock(&local->sta_mtx); 528 529 /* add any remaining IEs */ 530 if (extra_ies_len) { 531 noffset = extra_ies_len; 532 pos = skb_put(skb, noffset - offset); 533 memcpy(pos, extra_ies + offset, noffset - offset); 534 } 535 536 } 537 538 static void 539 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata, 540 struct sk_buff *skb, const u8 *peer, 541 bool initiator, const u8 *extra_ies, 542 size_t extra_ies_len) 543 { 544 struct ieee80211_local *local = sdata->local; 545 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 546 size_t offset = 0, noffset; 547 struct sta_info *sta, *ap_sta; 548 enum nl80211_band band = ieee80211_get_sdata_band(sdata); 549 u8 *pos; 550 551 mutex_lock(&local->sta_mtx); 552 553 sta = sta_info_get(sdata, peer); 554 ap_sta = sta_info_get(sdata, ifmgd->bssid); 555 if (WARN_ON_ONCE(!sta || !ap_sta)) { 556 mutex_unlock(&local->sta_mtx); 557 return; 558 } 559 560 sta->tdls_chandef = sdata->vif.bss_conf.chandef; 561 562 /* add any custom IEs that go before the QoS IE */ 563 if (extra_ies_len) { 564 static const u8 before_qos[] = { 565 WLAN_EID_RSN, 566 }; 567 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 568 before_qos, 569 ARRAY_SIZE(before_qos), 570 offset); 571 pos = skb_put(skb, noffset - offset); 572 memcpy(pos, extra_ies + offset, noffset - offset); 573 offset = noffset; 574 } 575 576 /* add the QoS param IE if both the peer and we support it */ 577 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme) 578 ieee80211_tdls_add_wmm_param_ie(sdata, skb); 579 580 /* add any custom IEs that go before HT operation */ 581 if (extra_ies_len) { 582 static const u8 before_ht_op[] = { 583 WLAN_EID_RSN, 584 WLAN_EID_QOS_CAPA, 585 WLAN_EID_FAST_BSS_TRANSITION, 586 WLAN_EID_TIMEOUT_INTERVAL, 587 }; 588 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 589 before_ht_op, 590 ARRAY_SIZE(before_ht_op), 591 offset); 592 pos = skb_put(skb, noffset - offset); 593 memcpy(pos, extra_ies + offset, noffset - offset); 594 offset = noffset; 595 } 596 597 /* 598 * if HT support is only added in TDLS, we need an HT-operation IE. 599 * add the IE as required by IEEE802.11-2012 9.23.3.2. 600 */ 601 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { 602 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 603 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 604 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 605 606 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 607 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap, 608 &sdata->vif.bss_conf.chandef, prot, 609 true); 610 } 611 612 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 613 614 /* only include VHT-operation if not on the 2.4GHz band */ 615 if (band != NL80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) { 616 /* 617 * if both peers support WIDER_BW, we can expand the chandef to 618 * a wider compatible one, up to 80MHz 619 */ 620 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 621 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 622 623 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 624 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap, 625 &sta->tdls_chandef); 626 } 627 628 mutex_unlock(&local->sta_mtx); 629 630 /* add any remaining IEs */ 631 if (extra_ies_len) { 632 noffset = extra_ies_len; 633 pos = skb_put(skb, noffset - offset); 634 memcpy(pos, extra_ies + offset, noffset - offset); 635 } 636 } 637 638 static void 639 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata, 640 struct sk_buff *skb, const u8 *peer, 641 bool initiator, const u8 *extra_ies, 642 size_t extra_ies_len, u8 oper_class, 643 struct cfg80211_chan_def *chandef) 644 { 645 struct ieee80211_tdls_data *tf; 646 size_t offset = 0, noffset; 647 u8 *pos; 648 649 if (WARN_ON_ONCE(!chandef)) 650 return; 651 652 tf = (void *)skb->data; 653 tf->u.chan_switch_req.target_channel = 654 ieee80211_frequency_to_channel(chandef->chan->center_freq); 655 tf->u.chan_switch_req.oper_class = oper_class; 656 657 if (extra_ies_len) { 658 static const u8 before_lnkie[] = { 659 WLAN_EID_SECONDARY_CHANNEL_OFFSET, 660 }; 661 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 662 before_lnkie, 663 ARRAY_SIZE(before_lnkie), 664 offset); 665 pos = skb_put(skb, noffset - offset); 666 memcpy(pos, extra_ies + offset, noffset - offset); 667 offset = noffset; 668 } 669 670 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 671 672 /* add any remaining IEs */ 673 if (extra_ies_len) { 674 noffset = extra_ies_len; 675 pos = skb_put(skb, noffset - offset); 676 memcpy(pos, extra_ies + offset, noffset - offset); 677 } 678 } 679 680 static void 681 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata, 682 struct sk_buff *skb, const u8 *peer, 683 u16 status_code, bool initiator, 684 const u8 *extra_ies, 685 size_t extra_ies_len) 686 { 687 if (status_code == 0) 688 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 689 690 if (extra_ies_len) 691 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len); 692 } 693 694 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata, 695 struct sk_buff *skb, const u8 *peer, 696 u8 action_code, u16 status_code, 697 bool initiator, const u8 *extra_ies, 698 size_t extra_ies_len, u8 oper_class, 699 struct cfg80211_chan_def *chandef) 700 { 701 switch (action_code) { 702 case WLAN_TDLS_SETUP_REQUEST: 703 case WLAN_TDLS_SETUP_RESPONSE: 704 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 705 if (status_code == 0) 706 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer, 707 action_code, 708 initiator, 709 extra_ies, 710 extra_ies_len); 711 break; 712 case WLAN_TDLS_SETUP_CONFIRM: 713 if (status_code == 0) 714 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer, 715 initiator, extra_ies, 716 extra_ies_len); 717 break; 718 case WLAN_TDLS_TEARDOWN: 719 case WLAN_TDLS_DISCOVERY_REQUEST: 720 if (extra_ies_len) 721 memcpy(skb_put(skb, extra_ies_len), extra_ies, 722 extra_ies_len); 723 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN) 724 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 725 break; 726 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 727 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer, 728 initiator, extra_ies, 729 extra_ies_len, 730 oper_class, chandef); 731 break; 732 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 733 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer, 734 status_code, 735 initiator, extra_ies, 736 extra_ies_len); 737 break; 738 } 739 740 } 741 742 static int 743 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev, 744 const u8 *peer, u8 action_code, u8 dialog_token, 745 u16 status_code, struct sk_buff *skb) 746 { 747 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 748 struct ieee80211_tdls_data *tf; 749 750 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u)); 751 752 memcpy(tf->da, peer, ETH_ALEN); 753 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN); 754 tf->ether_type = cpu_to_be16(ETH_P_TDLS); 755 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE; 756 757 /* network header is after the ethernet header */ 758 skb_set_network_header(skb, ETH_HLEN); 759 760 switch (action_code) { 761 case WLAN_TDLS_SETUP_REQUEST: 762 tf->category = WLAN_CATEGORY_TDLS; 763 tf->action_code = WLAN_TDLS_SETUP_REQUEST; 764 765 skb_put(skb, sizeof(tf->u.setup_req)); 766 tf->u.setup_req.dialog_token = dialog_token; 767 tf->u.setup_req.capability = 768 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 769 status_code)); 770 break; 771 case WLAN_TDLS_SETUP_RESPONSE: 772 tf->category = WLAN_CATEGORY_TDLS; 773 tf->action_code = WLAN_TDLS_SETUP_RESPONSE; 774 775 skb_put(skb, sizeof(tf->u.setup_resp)); 776 tf->u.setup_resp.status_code = cpu_to_le16(status_code); 777 tf->u.setup_resp.dialog_token = dialog_token; 778 tf->u.setup_resp.capability = 779 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 780 status_code)); 781 break; 782 case WLAN_TDLS_SETUP_CONFIRM: 783 tf->category = WLAN_CATEGORY_TDLS; 784 tf->action_code = WLAN_TDLS_SETUP_CONFIRM; 785 786 skb_put(skb, sizeof(tf->u.setup_cfm)); 787 tf->u.setup_cfm.status_code = cpu_to_le16(status_code); 788 tf->u.setup_cfm.dialog_token = dialog_token; 789 break; 790 case WLAN_TDLS_TEARDOWN: 791 tf->category = WLAN_CATEGORY_TDLS; 792 tf->action_code = WLAN_TDLS_TEARDOWN; 793 794 skb_put(skb, sizeof(tf->u.teardown)); 795 tf->u.teardown.reason_code = cpu_to_le16(status_code); 796 break; 797 case WLAN_TDLS_DISCOVERY_REQUEST: 798 tf->category = WLAN_CATEGORY_TDLS; 799 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST; 800 801 skb_put(skb, sizeof(tf->u.discover_req)); 802 tf->u.discover_req.dialog_token = dialog_token; 803 break; 804 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 805 tf->category = WLAN_CATEGORY_TDLS; 806 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 807 808 skb_put(skb, sizeof(tf->u.chan_switch_req)); 809 break; 810 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 811 tf->category = WLAN_CATEGORY_TDLS; 812 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 813 814 skb_put(skb, sizeof(tf->u.chan_switch_resp)); 815 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code); 816 break; 817 default: 818 return -EINVAL; 819 } 820 821 return 0; 822 } 823 824 static int 825 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev, 826 const u8 *peer, u8 action_code, u8 dialog_token, 827 u16 status_code, struct sk_buff *skb) 828 { 829 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 830 struct ieee80211_mgmt *mgmt; 831 832 mgmt = (void *)skb_put(skb, 24); 833 memset(mgmt, 0, 24); 834 memcpy(mgmt->da, peer, ETH_ALEN); 835 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 836 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 837 838 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 839 IEEE80211_STYPE_ACTION); 840 841 switch (action_code) { 842 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 843 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp)); 844 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC; 845 mgmt->u.action.u.tdls_discover_resp.action_code = 846 WLAN_PUB_ACTION_TDLS_DISCOVER_RES; 847 mgmt->u.action.u.tdls_discover_resp.dialog_token = 848 dialog_token; 849 mgmt->u.action.u.tdls_discover_resp.capability = 850 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 851 status_code)); 852 break; 853 default: 854 return -EINVAL; 855 } 856 857 return 0; 858 } 859 860 static struct sk_buff * 861 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata, 862 const u8 *peer, u8 action_code, 863 u8 dialog_token, u16 status_code, 864 bool initiator, const u8 *extra_ies, 865 size_t extra_ies_len, u8 oper_class, 866 struct cfg80211_chan_def *chandef) 867 { 868 struct ieee80211_local *local = sdata->local; 869 struct sk_buff *skb; 870 int ret; 871 872 skb = netdev_alloc_skb(sdata->dev, 873 local->hw.extra_tx_headroom + 874 max(sizeof(struct ieee80211_mgmt), 875 sizeof(struct ieee80211_tdls_data)) + 876 50 + /* supported rates */ 877 10 + /* ext capab */ 878 26 + /* max(WMM-info, WMM-param) */ 879 2 + max(sizeof(struct ieee80211_ht_cap), 880 sizeof(struct ieee80211_ht_operation)) + 881 2 + max(sizeof(struct ieee80211_vht_cap), 882 sizeof(struct ieee80211_vht_operation)) + 883 50 + /* supported channels */ 884 3 + /* 40/20 BSS coex */ 885 4 + /* AID */ 886 4 + /* oper classes */ 887 extra_ies_len + 888 sizeof(struct ieee80211_tdls_lnkie)); 889 if (!skb) 890 return NULL; 891 892 skb_reserve(skb, local->hw.extra_tx_headroom); 893 894 switch (action_code) { 895 case WLAN_TDLS_SETUP_REQUEST: 896 case WLAN_TDLS_SETUP_RESPONSE: 897 case WLAN_TDLS_SETUP_CONFIRM: 898 case WLAN_TDLS_TEARDOWN: 899 case WLAN_TDLS_DISCOVERY_REQUEST: 900 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 901 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 902 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy, 903 sdata->dev, peer, 904 action_code, dialog_token, 905 status_code, skb); 906 break; 907 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 908 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev, 909 peer, action_code, 910 dialog_token, status_code, 911 skb); 912 break; 913 default: 914 ret = -ENOTSUPP; 915 break; 916 } 917 918 if (ret < 0) 919 goto fail; 920 921 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code, 922 initiator, extra_ies, extra_ies_len, oper_class, 923 chandef); 924 return skb; 925 926 fail: 927 dev_kfree_skb(skb); 928 return NULL; 929 } 930 931 static int 932 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, 933 const u8 *peer, u8 action_code, u8 dialog_token, 934 u16 status_code, u32 peer_capability, 935 bool initiator, const u8 *extra_ies, 936 size_t extra_ies_len, u8 oper_class, 937 struct cfg80211_chan_def *chandef) 938 { 939 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 940 struct sk_buff *skb = NULL; 941 struct sta_info *sta; 942 u32 flags = 0; 943 int ret = 0; 944 945 rcu_read_lock(); 946 sta = sta_info_get(sdata, peer); 947 948 /* infer the initiator if we can, to support old userspace */ 949 switch (action_code) { 950 case WLAN_TDLS_SETUP_REQUEST: 951 if (sta) { 952 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 953 sta->sta.tdls_initiator = false; 954 } 955 /* fall-through */ 956 case WLAN_TDLS_SETUP_CONFIRM: 957 case WLAN_TDLS_DISCOVERY_REQUEST: 958 initiator = true; 959 break; 960 case WLAN_TDLS_SETUP_RESPONSE: 961 /* 962 * In some testing scenarios, we send a request and response. 963 * Make the last packet sent take effect for the initiator 964 * value. 965 */ 966 if (sta) { 967 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 968 sta->sta.tdls_initiator = true; 969 } 970 /* fall-through */ 971 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 972 initiator = false; 973 break; 974 case WLAN_TDLS_TEARDOWN: 975 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 976 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 977 /* any value is ok */ 978 break; 979 default: 980 ret = -ENOTSUPP; 981 break; 982 } 983 984 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR)) 985 initiator = true; 986 987 rcu_read_unlock(); 988 if (ret < 0) 989 goto fail; 990 991 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code, 992 dialog_token, status_code, 993 initiator, extra_ies, 994 extra_ies_len, oper_class, 995 chandef); 996 if (!skb) { 997 ret = -EINVAL; 998 goto fail; 999 } 1000 1001 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { 1002 ieee80211_tx_skb(sdata, skb); 1003 return 0; 1004 } 1005 1006 /* 1007 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise 1008 * we should default to AC_VI. 1009 */ 1010 switch (action_code) { 1011 case WLAN_TDLS_SETUP_REQUEST: 1012 case WLAN_TDLS_SETUP_RESPONSE: 1013 skb_set_queue_mapping(skb, IEEE80211_AC_BK); 1014 skb->priority = 2; 1015 break; 1016 default: 1017 skb_set_queue_mapping(skb, IEEE80211_AC_VI); 1018 skb->priority = 5; 1019 break; 1020 } 1021 1022 /* 1023 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress. 1024 * Later, if no ACK is returned from peer, we will re-send the teardown 1025 * packet through the AP. 1026 */ 1027 if ((action_code == WLAN_TDLS_TEARDOWN) && 1028 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 1029 bool try_resend; /* Should we keep skb for possible resend */ 1030 1031 /* If not sending directly to peer - no point in keeping skb */ 1032 rcu_read_lock(); 1033 sta = sta_info_get(sdata, peer); 1034 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1035 rcu_read_unlock(); 1036 1037 spin_lock_bh(&sdata->u.mgd.teardown_lock); 1038 if (try_resend && !sdata->u.mgd.teardown_skb) { 1039 /* Mark it as requiring TX status callback */ 1040 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 1041 IEEE80211_TX_INTFL_MLME_CONN_TX; 1042 1043 /* 1044 * skb is copied since mac80211 will later set 1045 * properties that might not be the same as the AP, 1046 * such as encryption, QoS, addresses, etc. 1047 * 1048 * No problem if skb_copy() fails, so no need to check. 1049 */ 1050 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC); 1051 sdata->u.mgd.orig_teardown_skb = skb; 1052 } 1053 spin_unlock_bh(&sdata->u.mgd.teardown_lock); 1054 } 1055 1056 /* disable bottom halves when entering the Tx path */ 1057 local_bh_disable(); 1058 __ieee80211_subif_start_xmit(skb, dev, flags); 1059 local_bh_enable(); 1060 1061 return ret; 1062 1063 fail: 1064 dev_kfree_skb(skb); 1065 return ret; 1066 } 1067 1068 static int 1069 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, 1070 const u8 *peer, u8 action_code, u8 dialog_token, 1071 u16 status_code, u32 peer_capability, bool initiator, 1072 const u8 *extra_ies, size_t extra_ies_len) 1073 { 1074 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1075 struct ieee80211_local *local = sdata->local; 1076 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode; 1077 int ret; 1078 1079 /* don't support setup with forced SMPS mode that's not off */ 1080 if (smps_mode != IEEE80211_SMPS_AUTOMATIC && 1081 smps_mode != IEEE80211_SMPS_OFF) { 1082 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n", 1083 smps_mode); 1084 return -ENOTSUPP; 1085 } 1086 1087 mutex_lock(&local->mtx); 1088 1089 /* we don't support concurrent TDLS peer setups */ 1090 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && 1091 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1092 ret = -EBUSY; 1093 goto out_unlock; 1094 } 1095 1096 /* 1097 * make sure we have a STA representing the peer so we drop or buffer 1098 * non-TDLS-setup frames to the peer. We can't send other packets 1099 * during setup through the AP path. 1100 * Allow error packets to be sent - sometimes we don't even add a STA 1101 * before failing the setup. 1102 */ 1103 if (status_code == 0) { 1104 rcu_read_lock(); 1105 if (!sta_info_get(sdata, peer)) { 1106 rcu_read_unlock(); 1107 ret = -ENOLINK; 1108 goto out_unlock; 1109 } 1110 rcu_read_unlock(); 1111 } 1112 1113 ieee80211_flush_queues(local, sdata, false); 1114 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); 1115 mutex_unlock(&local->mtx); 1116 1117 /* we cannot take the mutex while preparing the setup packet */ 1118 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1119 dialog_token, status_code, 1120 peer_capability, initiator, 1121 extra_ies, extra_ies_len, 0, 1122 NULL); 1123 if (ret < 0) { 1124 mutex_lock(&local->mtx); 1125 eth_zero_addr(sdata->u.mgd.tdls_peer); 1126 mutex_unlock(&local->mtx); 1127 return ret; 1128 } 1129 1130 ieee80211_queue_delayed_work(&sdata->local->hw, 1131 &sdata->u.mgd.tdls_peer_del_work, 1132 TDLS_PEER_SETUP_TIMEOUT); 1133 return 0; 1134 1135 out_unlock: 1136 mutex_unlock(&local->mtx); 1137 return ret; 1138 } 1139 1140 static int 1141 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, 1142 const u8 *peer, u8 action_code, u8 dialog_token, 1143 u16 status_code, u32 peer_capability, 1144 bool initiator, const u8 *extra_ies, 1145 size_t extra_ies_len) 1146 { 1147 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1148 struct ieee80211_local *local = sdata->local; 1149 struct sta_info *sta; 1150 int ret; 1151 1152 /* 1153 * No packets can be transmitted to the peer via the AP during setup - 1154 * the STA is set as a TDLS peer, but is not authorized. 1155 * During teardown, we prevent direct transmissions by stopping the 1156 * queues and flushing all direct packets. 1157 */ 1158 ieee80211_stop_vif_queues(local, sdata, 1159 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1160 ieee80211_flush_queues(local, sdata, false); 1161 1162 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1163 dialog_token, status_code, 1164 peer_capability, initiator, 1165 extra_ies, extra_ies_len, 0, 1166 NULL); 1167 if (ret < 0) 1168 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", 1169 ret); 1170 1171 /* 1172 * Remove the STA AUTH flag to force further traffic through the AP. If 1173 * the STA was unreachable, it was already removed. 1174 */ 1175 rcu_read_lock(); 1176 sta = sta_info_get(sdata, peer); 1177 if (sta) 1178 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1179 rcu_read_unlock(); 1180 1181 ieee80211_wake_vif_queues(local, sdata, 1182 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1183 1184 return 0; 1185 } 1186 1187 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 1188 const u8 *peer, u8 action_code, u8 dialog_token, 1189 u16 status_code, u32 peer_capability, 1190 bool initiator, const u8 *extra_ies, 1191 size_t extra_ies_len) 1192 { 1193 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1194 int ret; 1195 1196 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1197 return -ENOTSUPP; 1198 1199 /* make sure we are in managed mode, and associated */ 1200 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1201 !sdata->u.mgd.associated) 1202 return -EINVAL; 1203 1204 switch (action_code) { 1205 case WLAN_TDLS_SETUP_REQUEST: 1206 case WLAN_TDLS_SETUP_RESPONSE: 1207 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code, 1208 dialog_token, status_code, 1209 peer_capability, initiator, 1210 extra_ies, extra_ies_len); 1211 break; 1212 case WLAN_TDLS_TEARDOWN: 1213 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, 1214 action_code, dialog_token, 1215 status_code, 1216 peer_capability, initiator, 1217 extra_ies, extra_ies_len); 1218 break; 1219 case WLAN_TDLS_DISCOVERY_REQUEST: 1220 /* 1221 * Protect the discovery so we can hear the TDLS discovery 1222 * response frame. It is transmitted directly and not buffered 1223 * by the AP. 1224 */ 1225 drv_mgd_protect_tdls_discover(sdata->local, sdata); 1226 /* fall-through */ 1227 case WLAN_TDLS_SETUP_CONFIRM: 1228 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1229 /* no special handling */ 1230 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1231 action_code, 1232 dialog_token, 1233 status_code, 1234 peer_capability, 1235 initiator, extra_ies, 1236 extra_ies_len, 0, NULL); 1237 break; 1238 default: 1239 ret = -EOPNOTSUPP; 1240 break; 1241 } 1242 1243 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n", 1244 action_code, peer, ret); 1245 return ret; 1246 } 1247 1248 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata, 1249 struct sta_info *sta) 1250 { 1251 struct ieee80211_local *local = sdata->local; 1252 struct ieee80211_chanctx_conf *conf; 1253 struct ieee80211_chanctx *ctx; 1254 enum nl80211_chan_width width; 1255 struct ieee80211_supported_band *sband; 1256 1257 mutex_lock(&local->chanctx_mtx); 1258 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1259 lockdep_is_held(&local->chanctx_mtx)); 1260 if (conf) { 1261 width = conf->def.width; 1262 sband = local->hw.wiphy->bands[conf->def.chan->band]; 1263 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1264 ieee80211_recalc_chanctx_chantype(local, ctx); 1265 1266 /* if width changed and a peer is given, update its BW */ 1267 if (width != conf->def.width && sta && 1268 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) { 1269 enum ieee80211_sta_rx_bandwidth bw; 1270 1271 bw = ieee80211_chan_width_to_rx_bw(conf->def.width); 1272 bw = min(bw, ieee80211_sta_cap_rx_bw(sta)); 1273 if (bw != sta->sta.bandwidth) { 1274 sta->sta.bandwidth = bw; 1275 rate_control_rate_update(local, sband, sta, 1276 IEEE80211_RC_BW_CHANGED); 1277 /* 1278 * if a TDLS peer BW was updated, we need to 1279 * recalc the chandef width again, to get the 1280 * correct chanctx min_def 1281 */ 1282 ieee80211_recalc_chanctx_chantype(local, ctx); 1283 } 1284 } 1285 1286 } 1287 mutex_unlock(&local->chanctx_mtx); 1288 } 1289 1290 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata) 1291 { 1292 struct sta_info *sta; 1293 bool result = false; 1294 1295 rcu_read_lock(); 1296 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1297 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1298 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 1299 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) || 1300 !sta->sta.ht_cap.ht_supported) 1301 continue; 1302 result = true; 1303 break; 1304 } 1305 rcu_read_unlock(); 1306 1307 return result; 1308 } 1309 1310 static void 1311 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata, 1312 struct sta_info *sta) 1313 { 1314 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1315 bool tdls_ht; 1316 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 1317 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 1318 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 1319 u16 opmode; 1320 1321 /* Nothing to do if the BSS connection uses HT */ 1322 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 1323 return; 1324 1325 tdls_ht = (sta && sta->sta.ht_cap.ht_supported) || 1326 iee80211_tdls_have_ht_peers(sdata); 1327 1328 opmode = sdata->vif.bss_conf.ht_operation_mode; 1329 1330 if (tdls_ht) 1331 opmode |= protection; 1332 else 1333 opmode &= ~protection; 1334 1335 if (opmode == sdata->vif.bss_conf.ht_operation_mode) 1336 return; 1337 1338 sdata->vif.bss_conf.ht_operation_mode = opmode; 1339 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT); 1340 } 1341 1342 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 1343 const u8 *peer, enum nl80211_tdls_operation oper) 1344 { 1345 struct sta_info *sta; 1346 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1347 struct ieee80211_local *local = sdata->local; 1348 int ret; 1349 1350 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1351 return -ENOTSUPP; 1352 1353 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1354 return -EINVAL; 1355 1356 switch (oper) { 1357 case NL80211_TDLS_ENABLE_LINK: 1358 case NL80211_TDLS_DISABLE_LINK: 1359 break; 1360 case NL80211_TDLS_TEARDOWN: 1361 case NL80211_TDLS_SETUP: 1362 case NL80211_TDLS_DISCOVERY_REQ: 1363 /* We don't support in-driver setup/teardown/discovery */ 1364 return -ENOTSUPP; 1365 } 1366 1367 /* protect possible bss_conf changes and avoid concurrency in 1368 * ieee80211_bss_info_change_notify() 1369 */ 1370 sdata_lock(sdata); 1371 mutex_lock(&local->mtx); 1372 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); 1373 1374 switch (oper) { 1375 case NL80211_TDLS_ENABLE_LINK: 1376 if (sdata->vif.csa_active) { 1377 tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); 1378 ret = -EBUSY; 1379 break; 1380 } 1381 1382 mutex_lock(&local->sta_mtx); 1383 sta = sta_info_get(sdata, peer); 1384 if (!sta) { 1385 mutex_unlock(&local->sta_mtx); 1386 ret = -ENOLINK; 1387 break; 1388 } 1389 1390 iee80211_tdls_recalc_chanctx(sdata, sta); 1391 iee80211_tdls_recalc_ht_protection(sdata, sta); 1392 1393 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1394 mutex_unlock(&local->sta_mtx); 1395 1396 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || 1397 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); 1398 ret = 0; 1399 break; 1400 case NL80211_TDLS_DISABLE_LINK: 1401 /* 1402 * The teardown message in ieee80211_tdls_mgmt_teardown() was 1403 * created while the queues were stopped, so it might still be 1404 * pending. Before flushing the queues we need to be sure the 1405 * message is handled by the tasklet handling pending messages, 1406 * otherwise we might start destroying the station before 1407 * sending the teardown packet. 1408 * Note that this only forces the tasklet to flush pendings - 1409 * not to stop the tasklet from rescheduling itself. 1410 */ 1411 tasklet_kill(&local->tx_pending_tasklet); 1412 /* flush a potentially queued teardown packet */ 1413 ieee80211_flush_queues(local, sdata, false); 1414 1415 ret = sta_info_destroy_addr(sdata, peer); 1416 1417 mutex_lock(&local->sta_mtx); 1418 iee80211_tdls_recalc_ht_protection(sdata, NULL); 1419 mutex_unlock(&local->sta_mtx); 1420 1421 iee80211_tdls_recalc_chanctx(sdata, NULL); 1422 break; 1423 default: 1424 ret = -ENOTSUPP; 1425 break; 1426 } 1427 1428 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1429 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work); 1430 eth_zero_addr(sdata->u.mgd.tdls_peer); 1431 } 1432 1433 if (ret == 0) 1434 ieee80211_queue_work(&sdata->local->hw, 1435 &sdata->u.mgd.request_smps_work); 1436 1437 mutex_unlock(&local->mtx); 1438 sdata_unlock(sdata); 1439 return ret; 1440 } 1441 1442 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, 1443 enum nl80211_tdls_operation oper, 1444 u16 reason_code, gfp_t gfp) 1445 { 1446 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1447 1448 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) { 1449 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", 1450 oper); 1451 return; 1452 } 1453 1454 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); 1455 } 1456 EXPORT_SYMBOL(ieee80211_tdls_oper_request); 1457 1458 static void 1459 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) 1460 { 1461 struct ieee80211_ch_switch_timing *ch_sw; 1462 1463 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; 1464 *buf++ = sizeof(struct ieee80211_ch_switch_timing); 1465 1466 ch_sw = (void *)buf; 1467 ch_sw->switch_time = cpu_to_le16(switch_time); 1468 ch_sw->switch_timeout = cpu_to_le16(switch_timeout); 1469 } 1470 1471 /* find switch timing IE in SKB ready for Tx */ 1472 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) 1473 { 1474 struct ieee80211_tdls_data *tf; 1475 const u8 *ie_start; 1476 1477 /* 1478 * Get the offset for the new location of the switch timing IE. 1479 * The SKB network header will now point to the "payload_type" 1480 * element of the TDLS data frame struct. 1481 */ 1482 tf = container_of(skb->data + skb_network_offset(skb), 1483 struct ieee80211_tdls_data, payload_type); 1484 ie_start = tf->u.chan_switch_req.variable; 1485 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, 1486 skb->len - (ie_start - skb->data)); 1487 } 1488 1489 static struct sk_buff * 1490 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, 1491 struct cfg80211_chan_def *chandef, 1492 u32 *ch_sw_tm_ie_offset) 1493 { 1494 struct ieee80211_sub_if_data *sdata = sta->sdata; 1495 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 1496 2 + sizeof(struct ieee80211_ch_switch_timing)]; 1497 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); 1498 u8 *pos = extra_ies; 1499 struct sk_buff *skb; 1500 1501 /* 1502 * if chandef points to a wide channel add a Secondary-Channel 1503 * Offset information element 1504 */ 1505 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1506 struct ieee80211_sec_chan_offs_ie *sec_chan_ie; 1507 bool ht40plus; 1508 1509 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 1510 *pos++ = sizeof(*sec_chan_ie); 1511 sec_chan_ie = (void *)pos; 1512 1513 ht40plus = cfg80211_get_chandef_type(chandef) == 1514 NL80211_CHAN_HT40PLUS; 1515 sec_chan_ie->sec_chan_offs = ht40plus ? 1516 IEEE80211_HT_PARAM_CHA_SEC_ABOVE : 1517 IEEE80211_HT_PARAM_CHA_SEC_BELOW; 1518 pos += sizeof(*sec_chan_ie); 1519 1520 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 1521 } 1522 1523 /* just set the values to 0, this is a template */ 1524 iee80211_tdls_add_ch_switch_timing(pos, 0, 0); 1525 1526 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1527 WLAN_TDLS_CHANNEL_SWITCH_REQUEST, 1528 0, 0, !sta->sta.tdls_initiator, 1529 extra_ies, extra_ies_len, 1530 oper_class, chandef); 1531 if (!skb) 1532 return NULL; 1533 1534 skb = ieee80211_build_data_template(sdata, skb, 0); 1535 if (IS_ERR(skb)) { 1536 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); 1537 return NULL; 1538 } 1539 1540 if (ch_sw_tm_ie_offset) { 1541 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1542 1543 if (!tm_ie) { 1544 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); 1545 dev_kfree_skb_any(skb); 1546 return NULL; 1547 } 1548 1549 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1550 } 1551 1552 tdls_dbg(sdata, 1553 "TDLS channel switch request template for %pM ch %d width %d\n", 1554 sta->sta.addr, chandef->chan->center_freq, chandef->width); 1555 return skb; 1556 } 1557 1558 int 1559 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, 1560 const u8 *addr, u8 oper_class, 1561 struct cfg80211_chan_def *chandef) 1562 { 1563 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1564 struct ieee80211_local *local = sdata->local; 1565 struct sta_info *sta; 1566 struct sk_buff *skb = NULL; 1567 u32 ch_sw_tm_ie; 1568 int ret; 1569 1570 mutex_lock(&local->sta_mtx); 1571 sta = sta_info_get(sdata, addr); 1572 if (!sta) { 1573 tdls_dbg(sdata, 1574 "Invalid TDLS peer %pM for channel switch request\n", 1575 addr); 1576 ret = -ENOENT; 1577 goto out; 1578 } 1579 1580 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { 1581 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", 1582 addr); 1583 ret = -ENOTSUPP; 1584 goto out; 1585 } 1586 1587 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, 1588 &ch_sw_tm_ie); 1589 if (!skb) { 1590 ret = -ENOENT; 1591 goto out; 1592 } 1593 1594 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, 1595 chandef, skb, ch_sw_tm_ie); 1596 if (!ret) 1597 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1598 1599 out: 1600 mutex_unlock(&local->sta_mtx); 1601 dev_kfree_skb_any(skb); 1602 return ret; 1603 } 1604 1605 void 1606 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, 1607 struct net_device *dev, 1608 const u8 *addr) 1609 { 1610 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1611 struct ieee80211_local *local = sdata->local; 1612 struct sta_info *sta; 1613 1614 mutex_lock(&local->sta_mtx); 1615 sta = sta_info_get(sdata, addr); 1616 if (!sta) { 1617 tdls_dbg(sdata, 1618 "Invalid TDLS peer %pM for channel switch cancel\n", 1619 addr); 1620 goto out; 1621 } 1622 1623 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 1624 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", 1625 addr); 1626 goto out; 1627 } 1628 1629 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 1630 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1631 1632 out: 1633 mutex_unlock(&local->sta_mtx); 1634 } 1635 1636 static struct sk_buff * 1637 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, 1638 u32 *ch_sw_tm_ie_offset) 1639 { 1640 struct ieee80211_sub_if_data *sdata = sta->sdata; 1641 struct sk_buff *skb; 1642 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; 1643 1644 /* initial timing are always zero in the template */ 1645 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); 1646 1647 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1648 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, 1649 0, 0, !sta->sta.tdls_initiator, 1650 extra_ies, sizeof(extra_ies), 0, NULL); 1651 if (!skb) 1652 return NULL; 1653 1654 skb = ieee80211_build_data_template(sdata, skb, 0); 1655 if (IS_ERR(skb)) { 1656 tdls_dbg(sdata, 1657 "Failed building TDLS channel switch resp frame\n"); 1658 return NULL; 1659 } 1660 1661 if (ch_sw_tm_ie_offset) { 1662 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1663 1664 if (!tm_ie) { 1665 tdls_dbg(sdata, 1666 "No switch timing IE in TDLS switch resp\n"); 1667 dev_kfree_skb_any(skb); 1668 return NULL; 1669 } 1670 1671 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1672 } 1673 1674 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", 1675 sta->sta.addr); 1676 return skb; 1677 } 1678 1679 static int 1680 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, 1681 struct sk_buff *skb) 1682 { 1683 struct ieee80211_local *local = sdata->local; 1684 struct ieee802_11_elems elems; 1685 struct sta_info *sta; 1686 struct ieee80211_tdls_data *tf = (void *)skb->data; 1687 bool local_initiator; 1688 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1689 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); 1690 struct ieee80211_tdls_ch_sw_params params = {}; 1691 int ret; 1692 1693 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 1694 params.timestamp = rx_status->device_timestamp; 1695 1696 if (skb->len < baselen) { 1697 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", 1698 skb->len); 1699 return -EINVAL; 1700 } 1701 1702 mutex_lock(&local->sta_mtx); 1703 sta = sta_info_get(sdata, tf->sa); 1704 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1705 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1706 tf->sa); 1707 ret = -EINVAL; 1708 goto out; 1709 } 1710 1711 params.sta = &sta->sta; 1712 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); 1713 if (params.status != 0) { 1714 ret = 0; 1715 goto call_drv; 1716 } 1717 1718 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, 1719 skb->len - baselen, false, &elems); 1720 if (elems.parse_error) { 1721 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); 1722 ret = -EINVAL; 1723 goto out; 1724 } 1725 1726 if (!elems.ch_sw_timing || !elems.lnk_id) { 1727 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); 1728 ret = -EINVAL; 1729 goto out; 1730 } 1731 1732 /* validate the initiator is set correctly */ 1733 local_initiator = 1734 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1735 if (local_initiator == sta->sta.tdls_initiator) { 1736 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1737 ret = -EINVAL; 1738 goto out; 1739 } 1740 1741 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); 1742 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); 1743 1744 params.tmpl_skb = 1745 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); 1746 if (!params.tmpl_skb) { 1747 ret = -ENOENT; 1748 goto out; 1749 } 1750 1751 ret = 0; 1752 call_drv: 1753 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1754 1755 tdls_dbg(sdata, 1756 "TDLS channel switch response received from %pM status %d\n", 1757 tf->sa, params.status); 1758 1759 out: 1760 mutex_unlock(&local->sta_mtx); 1761 dev_kfree_skb_any(params.tmpl_skb); 1762 return ret; 1763 } 1764 1765 static int 1766 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, 1767 struct sk_buff *skb) 1768 { 1769 struct ieee80211_local *local = sdata->local; 1770 struct ieee802_11_elems elems; 1771 struct cfg80211_chan_def chandef; 1772 struct ieee80211_channel *chan; 1773 enum nl80211_channel_type chan_type; 1774 int freq; 1775 u8 target_channel, oper_class; 1776 bool local_initiator; 1777 struct sta_info *sta; 1778 enum nl80211_band band; 1779 struct ieee80211_tdls_data *tf = (void *)skb->data; 1780 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1781 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); 1782 struct ieee80211_tdls_ch_sw_params params = {}; 1783 int ret = 0; 1784 1785 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 1786 params.timestamp = rx_status->device_timestamp; 1787 1788 if (skb->len < baselen) { 1789 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", 1790 skb->len); 1791 return -EINVAL; 1792 } 1793 1794 target_channel = tf->u.chan_switch_req.target_channel; 1795 oper_class = tf->u.chan_switch_req.oper_class; 1796 1797 /* 1798 * We can't easily infer the channel band. The operating class is 1799 * ambiguous - there are multiple tables (US/Europe/JP/Global). The 1800 * solution here is to treat channels with number >14 as 5GHz ones, 1801 * and specifically check for the (oper_class, channel) combinations 1802 * where this doesn't hold. These are thankfully unique according to 1803 * IEEE802.11-2012. 1804 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as 1805 * valid here. 1806 */ 1807 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || 1808 oper_class == 4 || oper_class == 5 || oper_class == 6) && 1809 target_channel < 14) 1810 band = NL80211_BAND_5GHZ; 1811 else 1812 band = target_channel < 14 ? NL80211_BAND_2GHZ : 1813 NL80211_BAND_5GHZ; 1814 1815 freq = ieee80211_channel_to_frequency(target_channel, band); 1816 if (freq == 0) { 1817 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", 1818 target_channel); 1819 return -EINVAL; 1820 } 1821 1822 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 1823 if (!chan) { 1824 tdls_dbg(sdata, 1825 "Unsupported channel for TDLS chan switch: %d\n", 1826 target_channel); 1827 return -EINVAL; 1828 } 1829 1830 ieee802_11_parse_elems(tf->u.chan_switch_req.variable, 1831 skb->len - baselen, false, &elems); 1832 if (elems.parse_error) { 1833 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); 1834 return -EINVAL; 1835 } 1836 1837 if (!elems.ch_sw_timing || !elems.lnk_id) { 1838 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); 1839 return -EINVAL; 1840 } 1841 1842 if (!elems.sec_chan_offs) { 1843 chan_type = NL80211_CHAN_HT20; 1844 } else { 1845 switch (elems.sec_chan_offs->sec_chan_offs) { 1846 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 1847 chan_type = NL80211_CHAN_HT40PLUS; 1848 break; 1849 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 1850 chan_type = NL80211_CHAN_HT40MINUS; 1851 break; 1852 default: 1853 chan_type = NL80211_CHAN_HT20; 1854 break; 1855 } 1856 } 1857 1858 cfg80211_chandef_create(&chandef, chan, chan_type); 1859 1860 /* we will be active on the TDLS link */ 1861 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, 1862 sdata->wdev.iftype)) { 1863 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); 1864 return -EINVAL; 1865 } 1866 1867 mutex_lock(&local->sta_mtx); 1868 sta = sta_info_get(sdata, tf->sa); 1869 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1870 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1871 tf->sa); 1872 ret = -EINVAL; 1873 goto out; 1874 } 1875 1876 params.sta = &sta->sta; 1877 1878 /* validate the initiator is set correctly */ 1879 local_initiator = 1880 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1881 if (local_initiator == sta->sta.tdls_initiator) { 1882 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1883 ret = -EINVAL; 1884 goto out; 1885 } 1886 1887 /* peer should have known better */ 1888 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs && 1889 elems.sec_chan_offs->sec_chan_offs) { 1890 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); 1891 ret = -ENOTSUPP; 1892 goto out; 1893 } 1894 1895 params.chandef = &chandef; 1896 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); 1897 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); 1898 1899 params.tmpl_skb = 1900 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, 1901 ¶ms.ch_sw_tm_ie); 1902 if (!params.tmpl_skb) { 1903 ret = -ENOENT; 1904 goto out; 1905 } 1906 1907 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1908 1909 tdls_dbg(sdata, 1910 "TDLS ch switch request received from %pM ch %d width %d\n", 1911 tf->sa, params.chandef->chan->center_freq, 1912 params.chandef->width); 1913 out: 1914 mutex_unlock(&local->sta_mtx); 1915 dev_kfree_skb_any(params.tmpl_skb); 1916 return ret; 1917 } 1918 1919 static void 1920 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, 1921 struct sk_buff *skb) 1922 { 1923 struct ieee80211_tdls_data *tf = (void *)skb->data; 1924 struct wiphy *wiphy = sdata->local->hw.wiphy; 1925 1926 ASSERT_RTNL(); 1927 1928 /* make sure the driver supports it */ 1929 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) 1930 return; 1931 1932 /* we want to access the entire packet */ 1933 if (skb_linearize(skb)) 1934 return; 1935 /* 1936 * The packet/size was already validated by mac80211 Rx path, only look 1937 * at the action type. 1938 */ 1939 switch (tf->action_code) { 1940 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 1941 ieee80211_process_tdls_channel_switch_req(sdata, skb); 1942 break; 1943 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 1944 ieee80211_process_tdls_channel_switch_resp(sdata, skb); 1945 break; 1946 default: 1947 WARN_ON_ONCE(1); 1948 return; 1949 } 1950 } 1951 1952 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata) 1953 { 1954 struct sta_info *sta; 1955 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 1956 1957 rcu_read_lock(); 1958 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1959 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1960 !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 1961 continue; 1962 1963 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, 1964 NL80211_TDLS_TEARDOWN, reason, 1965 GFP_ATOMIC); 1966 } 1967 rcu_read_unlock(); 1968 } 1969 1970 void ieee80211_tdls_chsw_work(struct work_struct *wk) 1971 { 1972 struct ieee80211_local *local = 1973 container_of(wk, struct ieee80211_local, tdls_chsw_work); 1974 struct ieee80211_sub_if_data *sdata; 1975 struct sk_buff *skb; 1976 struct ieee80211_tdls_data *tf; 1977 1978 rtnl_lock(); 1979 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) { 1980 tf = (struct ieee80211_tdls_data *)skb->data; 1981 list_for_each_entry(sdata, &local->interfaces, list) { 1982 if (!ieee80211_sdata_running(sdata) || 1983 sdata->vif.type != NL80211_IFTYPE_STATION || 1984 !ether_addr_equal(tf->da, sdata->vif.addr)) 1985 continue; 1986 1987 ieee80211_process_tdls_channel_switch(sdata, skb); 1988 break; 1989 } 1990 1991 kfree_skb(skb); 1992 } 1993 rtnl_unlock(); 1994 } 1995