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 ieee80211_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) == IEEE80211_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 */ 337 while (uc.width > max_width || 338 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc, 339 sdata->wdev.iftype)) 340 ieee80211_chandef_downgrade(&uc); 341 342 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) { 343 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n", 344 sta->tdls_chandef.width, uc.width); 345 346 /* 347 * the station is not yet authorized when BW upgrade is done, 348 * locking is not required 349 */ 350 sta->tdls_chandef = uc; 351 } 352 } 353 354 static void 355 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata, 356 struct sk_buff *skb, const u8 *peer, 357 u8 action_code, bool initiator, 358 const u8 *extra_ies, size_t extra_ies_len) 359 { 360 enum ieee80211_band band = ieee80211_get_sdata_band(sdata); 361 struct ieee80211_local *local = sdata->local; 362 struct ieee80211_supported_band *sband; 363 struct ieee80211_sta_ht_cap ht_cap; 364 struct ieee80211_sta_vht_cap vht_cap; 365 struct sta_info *sta = NULL; 366 size_t offset = 0, noffset; 367 u8 *pos; 368 369 ieee80211_add_srates_ie(sdata, skb, false, band); 370 ieee80211_add_ext_srates_ie(sdata, skb, false, band); 371 ieee80211_tdls_add_supp_channels(sdata, skb); 372 373 /* add any custom IEs that go before Extended Capabilities */ 374 if (extra_ies_len) { 375 static const u8 before_ext_cap[] = { 376 WLAN_EID_SUPP_RATES, 377 WLAN_EID_COUNTRY, 378 WLAN_EID_EXT_SUPP_RATES, 379 WLAN_EID_SUPPORTED_CHANNELS, 380 WLAN_EID_RSN, 381 }; 382 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 383 before_ext_cap, 384 ARRAY_SIZE(before_ext_cap), 385 offset); 386 pos = skb_put(skb, noffset - offset); 387 memcpy(pos, extra_ies + offset, noffset - offset); 388 offset = noffset; 389 } 390 391 ieee80211_tdls_add_ext_capab(sdata, skb); 392 393 /* add the QoS element if we support it */ 394 if (local->hw.queues >= IEEE80211_NUM_ACS && 395 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) 396 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */ 397 398 /* add any custom IEs that go before HT capabilities */ 399 if (extra_ies_len) { 400 static const u8 before_ht_cap[] = { 401 WLAN_EID_SUPP_RATES, 402 WLAN_EID_COUNTRY, 403 WLAN_EID_EXT_SUPP_RATES, 404 WLAN_EID_SUPPORTED_CHANNELS, 405 WLAN_EID_RSN, 406 WLAN_EID_EXT_CAPABILITY, 407 WLAN_EID_QOS_CAPA, 408 WLAN_EID_FAST_BSS_TRANSITION, 409 WLAN_EID_TIMEOUT_INTERVAL, 410 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 411 }; 412 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 413 before_ht_cap, 414 ARRAY_SIZE(before_ht_cap), 415 offset); 416 pos = skb_put(skb, noffset - offset); 417 memcpy(pos, extra_ies + offset, noffset - offset); 418 offset = noffset; 419 } 420 421 mutex_lock(&local->sta_mtx); 422 423 /* we should have the peer STA if we're already responding */ 424 if (action_code == WLAN_TDLS_SETUP_RESPONSE) { 425 sta = sta_info_get(sdata, peer); 426 if (WARN_ON_ONCE(!sta)) { 427 mutex_unlock(&local->sta_mtx); 428 return; 429 } 430 431 sta->tdls_chandef = sdata->vif.bss_conf.chandef; 432 } 433 434 ieee80211_tdls_add_oper_classes(sdata, skb); 435 436 /* 437 * with TDLS we can switch channels, and HT-caps are not necessarily 438 * the same on all bands. The specification limits the setup to a 439 * single HT-cap, so use the current band for now. 440 */ 441 sband = local->hw.wiphy->bands[band]; 442 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 443 444 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 445 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 446 ht_cap.ht_supported) { 447 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 448 449 /* disable SMPS in TDLS initiator */ 450 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED 451 << IEEE80211_HT_CAP_SM_PS_SHIFT; 452 453 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 454 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 455 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 456 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { 457 /* the peer caps are already intersected with our own */ 458 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap)); 459 460 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 461 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 462 } 463 464 if (ht_cap.ht_supported && 465 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 466 ieee80211_tdls_add_bss_coex_ie(skb); 467 468 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 469 470 /* add any custom IEs that go before VHT capabilities */ 471 if (extra_ies_len) { 472 static const u8 before_vht_cap[] = { 473 WLAN_EID_SUPP_RATES, 474 WLAN_EID_COUNTRY, 475 WLAN_EID_EXT_SUPP_RATES, 476 WLAN_EID_SUPPORTED_CHANNELS, 477 WLAN_EID_RSN, 478 WLAN_EID_EXT_CAPABILITY, 479 WLAN_EID_QOS_CAPA, 480 WLAN_EID_FAST_BSS_TRANSITION, 481 WLAN_EID_TIMEOUT_INTERVAL, 482 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 483 WLAN_EID_MULTI_BAND, 484 }; 485 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 486 before_vht_cap, 487 ARRAY_SIZE(before_vht_cap), 488 offset); 489 pos = skb_put(skb, noffset - offset); 490 memcpy(pos, extra_ies + offset, noffset - offset); 491 offset = noffset; 492 } 493 494 /* build the VHT-cap similarly to the HT-cap */ 495 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 496 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 497 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 498 vht_cap.vht_supported) { 499 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 500 501 /* the AID is present only when VHT is implemented */ 502 if (action_code == WLAN_TDLS_SETUP_REQUEST) 503 ieee80211_tdls_add_aid(sdata, skb); 504 505 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 506 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 507 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 508 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) { 509 /* the peer caps are already intersected with our own */ 510 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap)); 511 512 /* the AID is present only when VHT is implemented */ 513 ieee80211_tdls_add_aid(sdata, skb); 514 515 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 516 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 517 518 /* 519 * if both peers support WIDER_BW, we can expand the chandef to 520 * a wider compatible one, up to 80MHz 521 */ 522 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 523 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 524 } 525 526 mutex_unlock(&local->sta_mtx); 527 528 /* add any remaining IEs */ 529 if (extra_ies_len) { 530 noffset = extra_ies_len; 531 pos = skb_put(skb, noffset - offset); 532 memcpy(pos, extra_ies + offset, noffset - offset); 533 } 534 535 } 536 537 static void 538 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata, 539 struct sk_buff *skb, const u8 *peer, 540 bool initiator, const u8 *extra_ies, 541 size_t extra_ies_len) 542 { 543 struct ieee80211_local *local = sdata->local; 544 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 545 size_t offset = 0, noffset; 546 struct sta_info *sta, *ap_sta; 547 enum ieee80211_band band = ieee80211_get_sdata_band(sdata); 548 u8 *pos; 549 550 mutex_lock(&local->sta_mtx); 551 552 sta = sta_info_get(sdata, peer); 553 ap_sta = sta_info_get(sdata, ifmgd->bssid); 554 if (WARN_ON_ONCE(!sta || !ap_sta)) { 555 mutex_unlock(&local->sta_mtx); 556 return; 557 } 558 559 sta->tdls_chandef = sdata->vif.bss_conf.chandef; 560 561 /* add any custom IEs that go before the QoS IE */ 562 if (extra_ies_len) { 563 static const u8 before_qos[] = { 564 WLAN_EID_RSN, 565 }; 566 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 567 before_qos, 568 ARRAY_SIZE(before_qos), 569 offset); 570 pos = skb_put(skb, noffset - offset); 571 memcpy(pos, extra_ies + offset, noffset - offset); 572 offset = noffset; 573 } 574 575 /* add the QoS param IE if both the peer and we support it */ 576 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme) 577 ieee80211_tdls_add_wmm_param_ie(sdata, skb); 578 579 /* add any custom IEs that go before HT operation */ 580 if (extra_ies_len) { 581 static const u8 before_ht_op[] = { 582 WLAN_EID_RSN, 583 WLAN_EID_QOS_CAPA, 584 WLAN_EID_FAST_BSS_TRANSITION, 585 WLAN_EID_TIMEOUT_INTERVAL, 586 }; 587 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 588 before_ht_op, 589 ARRAY_SIZE(before_ht_op), 590 offset); 591 pos = skb_put(skb, noffset - offset); 592 memcpy(pos, extra_ies + offset, noffset - offset); 593 offset = noffset; 594 } 595 596 /* 597 * if HT support is only added in TDLS, we need an HT-operation IE. 598 * add the IE as required by IEEE802.11-2012 9.23.3.2. 599 */ 600 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { 601 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 602 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 603 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 604 605 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 606 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap, 607 &sdata->vif.bss_conf.chandef, prot, 608 true); 609 } 610 611 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 612 613 /* only include VHT-operation if not on the 2.4GHz band */ 614 if (band != IEEE80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) { 615 /* 616 * if both peers support WIDER_BW, we can expand the chandef to 617 * a wider compatible one, up to 80MHz 618 */ 619 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 620 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 621 622 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 623 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap, 624 &sta->tdls_chandef); 625 } 626 627 mutex_unlock(&local->sta_mtx); 628 629 /* add any remaining IEs */ 630 if (extra_ies_len) { 631 noffset = extra_ies_len; 632 pos = skb_put(skb, noffset - offset); 633 memcpy(pos, extra_ies + offset, noffset - offset); 634 } 635 } 636 637 static void 638 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata, 639 struct sk_buff *skb, const u8 *peer, 640 bool initiator, const u8 *extra_ies, 641 size_t extra_ies_len, u8 oper_class, 642 struct cfg80211_chan_def *chandef) 643 { 644 struct ieee80211_tdls_data *tf; 645 size_t offset = 0, noffset; 646 u8 *pos; 647 648 if (WARN_ON_ONCE(!chandef)) 649 return; 650 651 tf = (void *)skb->data; 652 tf->u.chan_switch_req.target_channel = 653 ieee80211_frequency_to_channel(chandef->chan->center_freq); 654 tf->u.chan_switch_req.oper_class = oper_class; 655 656 if (extra_ies_len) { 657 static const u8 before_lnkie[] = { 658 WLAN_EID_SECONDARY_CHANNEL_OFFSET, 659 }; 660 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 661 before_lnkie, 662 ARRAY_SIZE(before_lnkie), 663 offset); 664 pos = skb_put(skb, noffset - offset); 665 memcpy(pos, extra_ies + offset, noffset - offset); 666 offset = noffset; 667 } 668 669 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 670 671 /* add any remaining IEs */ 672 if (extra_ies_len) { 673 noffset = extra_ies_len; 674 pos = skb_put(skb, noffset - offset); 675 memcpy(pos, extra_ies + offset, noffset - offset); 676 } 677 } 678 679 static void 680 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata, 681 struct sk_buff *skb, const u8 *peer, 682 u16 status_code, bool initiator, 683 const u8 *extra_ies, 684 size_t extra_ies_len) 685 { 686 if (status_code == 0) 687 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 688 689 if (extra_ies_len) 690 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len); 691 } 692 693 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata, 694 struct sk_buff *skb, const u8 *peer, 695 u8 action_code, u16 status_code, 696 bool initiator, const u8 *extra_ies, 697 size_t extra_ies_len, u8 oper_class, 698 struct cfg80211_chan_def *chandef) 699 { 700 switch (action_code) { 701 case WLAN_TDLS_SETUP_REQUEST: 702 case WLAN_TDLS_SETUP_RESPONSE: 703 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 704 if (status_code == 0) 705 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer, 706 action_code, 707 initiator, 708 extra_ies, 709 extra_ies_len); 710 break; 711 case WLAN_TDLS_SETUP_CONFIRM: 712 if (status_code == 0) 713 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer, 714 initiator, extra_ies, 715 extra_ies_len); 716 break; 717 case WLAN_TDLS_TEARDOWN: 718 case WLAN_TDLS_DISCOVERY_REQUEST: 719 if (extra_ies_len) 720 memcpy(skb_put(skb, extra_ies_len), extra_ies, 721 extra_ies_len); 722 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN) 723 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); 724 break; 725 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 726 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer, 727 initiator, extra_ies, 728 extra_ies_len, 729 oper_class, chandef); 730 break; 731 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 732 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer, 733 status_code, 734 initiator, extra_ies, 735 extra_ies_len); 736 break; 737 } 738 739 } 740 741 static int 742 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev, 743 const u8 *peer, u8 action_code, u8 dialog_token, 744 u16 status_code, struct sk_buff *skb) 745 { 746 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 747 struct ieee80211_tdls_data *tf; 748 749 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u)); 750 751 memcpy(tf->da, peer, ETH_ALEN); 752 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN); 753 tf->ether_type = cpu_to_be16(ETH_P_TDLS); 754 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE; 755 756 /* network header is after the ethernet header */ 757 skb_set_network_header(skb, ETH_HLEN); 758 759 switch (action_code) { 760 case WLAN_TDLS_SETUP_REQUEST: 761 tf->category = WLAN_CATEGORY_TDLS; 762 tf->action_code = WLAN_TDLS_SETUP_REQUEST; 763 764 skb_put(skb, sizeof(tf->u.setup_req)); 765 tf->u.setup_req.dialog_token = dialog_token; 766 tf->u.setup_req.capability = 767 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 768 status_code)); 769 break; 770 case WLAN_TDLS_SETUP_RESPONSE: 771 tf->category = WLAN_CATEGORY_TDLS; 772 tf->action_code = WLAN_TDLS_SETUP_RESPONSE; 773 774 skb_put(skb, sizeof(tf->u.setup_resp)); 775 tf->u.setup_resp.status_code = cpu_to_le16(status_code); 776 tf->u.setup_resp.dialog_token = dialog_token; 777 tf->u.setup_resp.capability = 778 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 779 status_code)); 780 break; 781 case WLAN_TDLS_SETUP_CONFIRM: 782 tf->category = WLAN_CATEGORY_TDLS; 783 tf->action_code = WLAN_TDLS_SETUP_CONFIRM; 784 785 skb_put(skb, sizeof(tf->u.setup_cfm)); 786 tf->u.setup_cfm.status_code = cpu_to_le16(status_code); 787 tf->u.setup_cfm.dialog_token = dialog_token; 788 break; 789 case WLAN_TDLS_TEARDOWN: 790 tf->category = WLAN_CATEGORY_TDLS; 791 tf->action_code = WLAN_TDLS_TEARDOWN; 792 793 skb_put(skb, sizeof(tf->u.teardown)); 794 tf->u.teardown.reason_code = cpu_to_le16(status_code); 795 break; 796 case WLAN_TDLS_DISCOVERY_REQUEST: 797 tf->category = WLAN_CATEGORY_TDLS; 798 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST; 799 800 skb_put(skb, sizeof(tf->u.discover_req)); 801 tf->u.discover_req.dialog_token = dialog_token; 802 break; 803 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 804 tf->category = WLAN_CATEGORY_TDLS; 805 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 806 807 skb_put(skb, sizeof(tf->u.chan_switch_req)); 808 break; 809 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 810 tf->category = WLAN_CATEGORY_TDLS; 811 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 812 813 skb_put(skb, sizeof(tf->u.chan_switch_resp)); 814 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code); 815 break; 816 default: 817 return -EINVAL; 818 } 819 820 return 0; 821 } 822 823 static int 824 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev, 825 const u8 *peer, u8 action_code, u8 dialog_token, 826 u16 status_code, struct sk_buff *skb) 827 { 828 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 829 struct ieee80211_mgmt *mgmt; 830 831 mgmt = (void *)skb_put(skb, 24); 832 memset(mgmt, 0, 24); 833 memcpy(mgmt->da, peer, ETH_ALEN); 834 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 835 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 836 837 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 838 IEEE80211_STYPE_ACTION); 839 840 switch (action_code) { 841 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 842 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp)); 843 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC; 844 mgmt->u.action.u.tdls_discover_resp.action_code = 845 WLAN_PUB_ACTION_TDLS_DISCOVER_RES; 846 mgmt->u.action.u.tdls_discover_resp.dialog_token = 847 dialog_token; 848 mgmt->u.action.u.tdls_discover_resp.capability = 849 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, 850 status_code)); 851 break; 852 default: 853 return -EINVAL; 854 } 855 856 return 0; 857 } 858 859 static struct sk_buff * 860 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata, 861 const u8 *peer, u8 action_code, 862 u8 dialog_token, u16 status_code, 863 bool initiator, const u8 *extra_ies, 864 size_t extra_ies_len, u8 oper_class, 865 struct cfg80211_chan_def *chandef) 866 { 867 struct ieee80211_local *local = sdata->local; 868 struct sk_buff *skb; 869 int ret; 870 871 skb = netdev_alloc_skb(sdata->dev, 872 local->hw.extra_tx_headroom + 873 max(sizeof(struct ieee80211_mgmt), 874 sizeof(struct ieee80211_tdls_data)) + 875 50 + /* supported rates */ 876 10 + /* ext capab */ 877 26 + /* max(WMM-info, WMM-param) */ 878 2 + max(sizeof(struct ieee80211_ht_cap), 879 sizeof(struct ieee80211_ht_operation)) + 880 2 + max(sizeof(struct ieee80211_vht_cap), 881 sizeof(struct ieee80211_vht_operation)) + 882 50 + /* supported channels */ 883 3 + /* 40/20 BSS coex */ 884 4 + /* AID */ 885 4 + /* oper classes */ 886 extra_ies_len + 887 sizeof(struct ieee80211_tdls_lnkie)); 888 if (!skb) 889 return NULL; 890 891 skb_reserve(skb, local->hw.extra_tx_headroom); 892 893 switch (action_code) { 894 case WLAN_TDLS_SETUP_REQUEST: 895 case WLAN_TDLS_SETUP_RESPONSE: 896 case WLAN_TDLS_SETUP_CONFIRM: 897 case WLAN_TDLS_TEARDOWN: 898 case WLAN_TDLS_DISCOVERY_REQUEST: 899 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 900 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 901 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy, 902 sdata->dev, peer, 903 action_code, dialog_token, 904 status_code, skb); 905 break; 906 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 907 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev, 908 peer, action_code, 909 dialog_token, status_code, 910 skb); 911 break; 912 default: 913 ret = -ENOTSUPP; 914 break; 915 } 916 917 if (ret < 0) 918 goto fail; 919 920 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code, 921 initiator, extra_ies, extra_ies_len, oper_class, 922 chandef); 923 return skb; 924 925 fail: 926 dev_kfree_skb(skb); 927 return NULL; 928 } 929 930 static int 931 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, 932 const u8 *peer, u8 action_code, u8 dialog_token, 933 u16 status_code, u32 peer_capability, 934 bool initiator, const u8 *extra_ies, 935 size_t extra_ies_len, u8 oper_class, 936 struct cfg80211_chan_def *chandef) 937 { 938 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 939 struct sk_buff *skb = NULL; 940 struct sta_info *sta; 941 u32 flags = 0; 942 int ret = 0; 943 944 rcu_read_lock(); 945 sta = sta_info_get(sdata, peer); 946 947 /* infer the initiator if we can, to support old userspace */ 948 switch (action_code) { 949 case WLAN_TDLS_SETUP_REQUEST: 950 if (sta) { 951 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 952 sta->sta.tdls_initiator = false; 953 } 954 /* fall-through */ 955 case WLAN_TDLS_SETUP_CONFIRM: 956 case WLAN_TDLS_DISCOVERY_REQUEST: 957 initiator = true; 958 break; 959 case WLAN_TDLS_SETUP_RESPONSE: 960 /* 961 * In some testing scenarios, we send a request and response. 962 * Make the last packet sent take effect for the initiator 963 * value. 964 */ 965 if (sta) { 966 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 967 sta->sta.tdls_initiator = true; 968 } 969 /* fall-through */ 970 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 971 initiator = false; 972 break; 973 case WLAN_TDLS_TEARDOWN: 974 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 975 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 976 /* any value is ok */ 977 break; 978 default: 979 ret = -ENOTSUPP; 980 break; 981 } 982 983 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR)) 984 initiator = true; 985 986 rcu_read_unlock(); 987 if (ret < 0) 988 goto fail; 989 990 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code, 991 dialog_token, status_code, 992 initiator, extra_ies, 993 extra_ies_len, oper_class, 994 chandef); 995 if (!skb) { 996 ret = -EINVAL; 997 goto fail; 998 } 999 1000 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { 1001 ieee80211_tx_skb(sdata, skb); 1002 return 0; 1003 } 1004 1005 /* 1006 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise 1007 * we should default to AC_VI. 1008 */ 1009 switch (action_code) { 1010 case WLAN_TDLS_SETUP_REQUEST: 1011 case WLAN_TDLS_SETUP_RESPONSE: 1012 skb_set_queue_mapping(skb, IEEE80211_AC_BK); 1013 skb->priority = 2; 1014 break; 1015 default: 1016 skb_set_queue_mapping(skb, IEEE80211_AC_VI); 1017 skb->priority = 5; 1018 break; 1019 } 1020 1021 /* 1022 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress. 1023 * Later, if no ACK is returned from peer, we will re-send the teardown 1024 * packet through the AP. 1025 */ 1026 if ((action_code == WLAN_TDLS_TEARDOWN) && 1027 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 1028 bool try_resend; /* Should we keep skb for possible resend */ 1029 1030 /* If not sending directly to peer - no point in keeping skb */ 1031 rcu_read_lock(); 1032 sta = sta_info_get(sdata, peer); 1033 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1034 rcu_read_unlock(); 1035 1036 spin_lock_bh(&sdata->u.mgd.teardown_lock); 1037 if (try_resend && !sdata->u.mgd.teardown_skb) { 1038 /* Mark it as requiring TX status callback */ 1039 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 1040 IEEE80211_TX_INTFL_MLME_CONN_TX; 1041 1042 /* 1043 * skb is copied since mac80211 will later set 1044 * properties that might not be the same as the AP, 1045 * such as encryption, QoS, addresses, etc. 1046 * 1047 * No problem if skb_copy() fails, so no need to check. 1048 */ 1049 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC); 1050 sdata->u.mgd.orig_teardown_skb = skb; 1051 } 1052 spin_unlock_bh(&sdata->u.mgd.teardown_lock); 1053 } 1054 1055 /* disable bottom halves when entering the Tx path */ 1056 local_bh_disable(); 1057 __ieee80211_subif_start_xmit(skb, dev, flags); 1058 local_bh_enable(); 1059 1060 return ret; 1061 1062 fail: 1063 dev_kfree_skb(skb); 1064 return ret; 1065 } 1066 1067 static int 1068 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, 1069 const u8 *peer, u8 action_code, u8 dialog_token, 1070 u16 status_code, u32 peer_capability, bool initiator, 1071 const u8 *extra_ies, size_t extra_ies_len) 1072 { 1073 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1074 struct ieee80211_local *local = sdata->local; 1075 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode; 1076 int ret; 1077 1078 /* don't support setup with forced SMPS mode that's not off */ 1079 if (smps_mode != IEEE80211_SMPS_AUTOMATIC && 1080 smps_mode != IEEE80211_SMPS_OFF) { 1081 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n", 1082 smps_mode); 1083 return -ENOTSUPP; 1084 } 1085 1086 mutex_lock(&local->mtx); 1087 1088 /* we don't support concurrent TDLS peer setups */ 1089 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && 1090 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1091 ret = -EBUSY; 1092 goto out_unlock; 1093 } 1094 1095 /* 1096 * make sure we have a STA representing the peer so we drop or buffer 1097 * non-TDLS-setup frames to the peer. We can't send other packets 1098 * during setup through the AP path. 1099 * Allow error packets to be sent - sometimes we don't even add a STA 1100 * before failing the setup. 1101 */ 1102 if (status_code == 0) { 1103 rcu_read_lock(); 1104 if (!sta_info_get(sdata, peer)) { 1105 rcu_read_unlock(); 1106 ret = -ENOLINK; 1107 goto out_unlock; 1108 } 1109 rcu_read_unlock(); 1110 } 1111 1112 ieee80211_flush_queues(local, sdata, false); 1113 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); 1114 mutex_unlock(&local->mtx); 1115 1116 /* we cannot take the mutex while preparing the setup packet */ 1117 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1118 dialog_token, status_code, 1119 peer_capability, initiator, 1120 extra_ies, extra_ies_len, 0, 1121 NULL); 1122 if (ret < 0) { 1123 mutex_lock(&local->mtx); 1124 eth_zero_addr(sdata->u.mgd.tdls_peer); 1125 mutex_unlock(&local->mtx); 1126 return ret; 1127 } 1128 1129 ieee80211_queue_delayed_work(&sdata->local->hw, 1130 &sdata->u.mgd.tdls_peer_del_work, 1131 TDLS_PEER_SETUP_TIMEOUT); 1132 return 0; 1133 1134 out_unlock: 1135 mutex_unlock(&local->mtx); 1136 return ret; 1137 } 1138 1139 static int 1140 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, 1141 const u8 *peer, u8 action_code, u8 dialog_token, 1142 u16 status_code, u32 peer_capability, 1143 bool initiator, const u8 *extra_ies, 1144 size_t extra_ies_len) 1145 { 1146 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1147 struct ieee80211_local *local = sdata->local; 1148 struct sta_info *sta; 1149 int ret; 1150 1151 /* 1152 * No packets can be transmitted to the peer via the AP during setup - 1153 * the STA is set as a TDLS peer, but is not authorized. 1154 * During teardown, we prevent direct transmissions by stopping the 1155 * queues and flushing all direct packets. 1156 */ 1157 ieee80211_stop_vif_queues(local, sdata, 1158 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1159 ieee80211_flush_queues(local, sdata, false); 1160 1161 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, 1162 dialog_token, status_code, 1163 peer_capability, initiator, 1164 extra_ies, extra_ies_len, 0, 1165 NULL); 1166 if (ret < 0) 1167 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", 1168 ret); 1169 1170 /* 1171 * Remove the STA AUTH flag to force further traffic through the AP. If 1172 * the STA was unreachable, it was already removed. 1173 */ 1174 rcu_read_lock(); 1175 sta = sta_info_get(sdata, peer); 1176 if (sta) 1177 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1178 rcu_read_unlock(); 1179 1180 ieee80211_wake_vif_queues(local, sdata, 1181 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1182 1183 return 0; 1184 } 1185 1186 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 1187 const u8 *peer, u8 action_code, u8 dialog_token, 1188 u16 status_code, u32 peer_capability, 1189 bool initiator, const u8 *extra_ies, 1190 size_t extra_ies_len) 1191 { 1192 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1193 int ret; 1194 1195 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1196 return -ENOTSUPP; 1197 1198 /* make sure we are in managed mode, and associated */ 1199 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1200 !sdata->u.mgd.associated) 1201 return -EINVAL; 1202 1203 switch (action_code) { 1204 case WLAN_TDLS_SETUP_REQUEST: 1205 case WLAN_TDLS_SETUP_RESPONSE: 1206 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code, 1207 dialog_token, status_code, 1208 peer_capability, initiator, 1209 extra_ies, extra_ies_len); 1210 break; 1211 case WLAN_TDLS_TEARDOWN: 1212 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, 1213 action_code, dialog_token, 1214 status_code, 1215 peer_capability, initiator, 1216 extra_ies, extra_ies_len); 1217 break; 1218 case WLAN_TDLS_DISCOVERY_REQUEST: 1219 /* 1220 * Protect the discovery so we can hear the TDLS discovery 1221 * response frame. It is transmitted directly and not buffered 1222 * by the AP. 1223 */ 1224 drv_mgd_protect_tdls_discover(sdata->local, sdata); 1225 /* fall-through */ 1226 case WLAN_TDLS_SETUP_CONFIRM: 1227 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1228 /* no special handling */ 1229 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1230 action_code, 1231 dialog_token, 1232 status_code, 1233 peer_capability, 1234 initiator, extra_ies, 1235 extra_ies_len, 0, NULL); 1236 break; 1237 default: 1238 ret = -EOPNOTSUPP; 1239 break; 1240 } 1241 1242 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n", 1243 action_code, peer, ret); 1244 return ret; 1245 } 1246 1247 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata, 1248 struct sta_info *sta) 1249 { 1250 struct ieee80211_local *local = sdata->local; 1251 struct ieee80211_chanctx_conf *conf; 1252 struct ieee80211_chanctx *ctx; 1253 enum nl80211_chan_width width; 1254 struct ieee80211_supported_band *sband; 1255 1256 mutex_lock(&local->chanctx_mtx); 1257 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1258 lockdep_is_held(&local->chanctx_mtx)); 1259 if (conf) { 1260 width = conf->def.width; 1261 sband = local->hw.wiphy->bands[conf->def.chan->band]; 1262 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1263 ieee80211_recalc_chanctx_chantype(local, ctx); 1264 1265 /* if width changed and a peer is given, update its BW */ 1266 if (width != conf->def.width && sta && 1267 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) { 1268 enum ieee80211_sta_rx_bandwidth bw; 1269 1270 bw = ieee80211_chan_width_to_rx_bw(conf->def.width); 1271 bw = min(bw, ieee80211_sta_cap_rx_bw(sta)); 1272 if (bw != sta->sta.bandwidth) { 1273 sta->sta.bandwidth = bw; 1274 rate_control_rate_update(local, sband, sta, 1275 IEEE80211_RC_BW_CHANGED); 1276 /* 1277 * if a TDLS peer BW was updated, we need to 1278 * recalc the chandef width again, to get the 1279 * correct chanctx min_def 1280 */ 1281 ieee80211_recalc_chanctx_chantype(local, ctx); 1282 } 1283 } 1284 1285 } 1286 mutex_unlock(&local->chanctx_mtx); 1287 } 1288 1289 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata) 1290 { 1291 struct sta_info *sta; 1292 bool result = false; 1293 1294 rcu_read_lock(); 1295 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1296 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1297 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 1298 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) || 1299 !sta->sta.ht_cap.ht_supported) 1300 continue; 1301 result = true; 1302 break; 1303 } 1304 rcu_read_unlock(); 1305 1306 return result; 1307 } 1308 1309 static void 1310 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata, 1311 struct sta_info *sta) 1312 { 1313 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1314 bool tdls_ht; 1315 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 1316 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 1317 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 1318 u16 opmode; 1319 1320 /* Nothing to do if the BSS connection uses HT */ 1321 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 1322 return; 1323 1324 tdls_ht = (sta && sta->sta.ht_cap.ht_supported) || 1325 iee80211_tdls_have_ht_peers(sdata); 1326 1327 opmode = sdata->vif.bss_conf.ht_operation_mode; 1328 1329 if (tdls_ht) 1330 opmode |= protection; 1331 else 1332 opmode &= ~protection; 1333 1334 if (opmode == sdata->vif.bss_conf.ht_operation_mode) 1335 return; 1336 1337 sdata->vif.bss_conf.ht_operation_mode = opmode; 1338 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT); 1339 } 1340 1341 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 1342 const u8 *peer, enum nl80211_tdls_operation oper) 1343 { 1344 struct sta_info *sta; 1345 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1346 struct ieee80211_local *local = sdata->local; 1347 int ret; 1348 1349 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1350 return -ENOTSUPP; 1351 1352 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1353 return -EINVAL; 1354 1355 switch (oper) { 1356 case NL80211_TDLS_ENABLE_LINK: 1357 case NL80211_TDLS_DISABLE_LINK: 1358 break; 1359 case NL80211_TDLS_TEARDOWN: 1360 case NL80211_TDLS_SETUP: 1361 case NL80211_TDLS_DISCOVERY_REQ: 1362 /* We don't support in-driver setup/teardown/discovery */ 1363 return -ENOTSUPP; 1364 } 1365 1366 /* protect possible bss_conf changes and avoid concurrency in 1367 * ieee80211_bss_info_change_notify() 1368 */ 1369 sdata_lock(sdata); 1370 mutex_lock(&local->mtx); 1371 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); 1372 1373 switch (oper) { 1374 case NL80211_TDLS_ENABLE_LINK: 1375 if (sdata->vif.csa_active) { 1376 tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); 1377 ret = -EBUSY; 1378 break; 1379 } 1380 1381 mutex_lock(&local->sta_mtx); 1382 sta = sta_info_get(sdata, peer); 1383 if (!sta) { 1384 mutex_unlock(&local->sta_mtx); 1385 ret = -ENOLINK; 1386 break; 1387 } 1388 1389 iee80211_tdls_recalc_chanctx(sdata, sta); 1390 iee80211_tdls_recalc_ht_protection(sdata, sta); 1391 1392 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1393 mutex_unlock(&local->sta_mtx); 1394 1395 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || 1396 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); 1397 ret = 0; 1398 break; 1399 case NL80211_TDLS_DISABLE_LINK: 1400 /* 1401 * The teardown message in ieee80211_tdls_mgmt_teardown() was 1402 * created while the queues were stopped, so it might still be 1403 * pending. Before flushing the queues we need to be sure the 1404 * message is handled by the tasklet handling pending messages, 1405 * otherwise we might start destroying the station before 1406 * sending the teardown packet. 1407 * Note that this only forces the tasklet to flush pendings - 1408 * not to stop the tasklet from rescheduling itself. 1409 */ 1410 tasklet_kill(&local->tx_pending_tasklet); 1411 /* flush a potentially queued teardown packet */ 1412 ieee80211_flush_queues(local, sdata, false); 1413 1414 ret = sta_info_destroy_addr(sdata, peer); 1415 1416 mutex_lock(&local->sta_mtx); 1417 iee80211_tdls_recalc_ht_protection(sdata, NULL); 1418 mutex_unlock(&local->sta_mtx); 1419 1420 iee80211_tdls_recalc_chanctx(sdata, NULL); 1421 break; 1422 default: 1423 ret = -ENOTSUPP; 1424 break; 1425 } 1426 1427 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1428 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work); 1429 eth_zero_addr(sdata->u.mgd.tdls_peer); 1430 } 1431 1432 if (ret == 0) 1433 ieee80211_queue_work(&sdata->local->hw, 1434 &sdata->u.mgd.request_smps_work); 1435 1436 mutex_unlock(&local->mtx); 1437 sdata_unlock(sdata); 1438 return ret; 1439 } 1440 1441 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, 1442 enum nl80211_tdls_operation oper, 1443 u16 reason_code, gfp_t gfp) 1444 { 1445 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1446 1447 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) { 1448 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", 1449 oper); 1450 return; 1451 } 1452 1453 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); 1454 } 1455 EXPORT_SYMBOL(ieee80211_tdls_oper_request); 1456 1457 static void 1458 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) 1459 { 1460 struct ieee80211_ch_switch_timing *ch_sw; 1461 1462 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; 1463 *buf++ = sizeof(struct ieee80211_ch_switch_timing); 1464 1465 ch_sw = (void *)buf; 1466 ch_sw->switch_time = cpu_to_le16(switch_time); 1467 ch_sw->switch_timeout = cpu_to_le16(switch_timeout); 1468 } 1469 1470 /* find switch timing IE in SKB ready for Tx */ 1471 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) 1472 { 1473 struct ieee80211_tdls_data *tf; 1474 const u8 *ie_start; 1475 1476 /* 1477 * Get the offset for the new location of the switch timing IE. 1478 * The SKB network header will now point to the "payload_type" 1479 * element of the TDLS data frame struct. 1480 */ 1481 tf = container_of(skb->data + skb_network_offset(skb), 1482 struct ieee80211_tdls_data, payload_type); 1483 ie_start = tf->u.chan_switch_req.variable; 1484 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, 1485 skb->len - (ie_start - skb->data)); 1486 } 1487 1488 static struct sk_buff * 1489 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, 1490 struct cfg80211_chan_def *chandef, 1491 u32 *ch_sw_tm_ie_offset) 1492 { 1493 struct ieee80211_sub_if_data *sdata = sta->sdata; 1494 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 1495 2 + sizeof(struct ieee80211_ch_switch_timing)]; 1496 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); 1497 u8 *pos = extra_ies; 1498 struct sk_buff *skb; 1499 1500 /* 1501 * if chandef points to a wide channel add a Secondary-Channel 1502 * Offset information element 1503 */ 1504 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1505 struct ieee80211_sec_chan_offs_ie *sec_chan_ie; 1506 bool ht40plus; 1507 1508 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 1509 *pos++ = sizeof(*sec_chan_ie); 1510 sec_chan_ie = (void *)pos; 1511 1512 ht40plus = cfg80211_get_chandef_type(chandef) == 1513 NL80211_CHAN_HT40PLUS; 1514 sec_chan_ie->sec_chan_offs = ht40plus ? 1515 IEEE80211_HT_PARAM_CHA_SEC_ABOVE : 1516 IEEE80211_HT_PARAM_CHA_SEC_BELOW; 1517 pos += sizeof(*sec_chan_ie); 1518 1519 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 1520 } 1521 1522 /* just set the values to 0, this is a template */ 1523 iee80211_tdls_add_ch_switch_timing(pos, 0, 0); 1524 1525 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1526 WLAN_TDLS_CHANNEL_SWITCH_REQUEST, 1527 0, 0, !sta->sta.tdls_initiator, 1528 extra_ies, extra_ies_len, 1529 oper_class, chandef); 1530 if (!skb) 1531 return NULL; 1532 1533 skb = ieee80211_build_data_template(sdata, skb, 0); 1534 if (IS_ERR(skb)) { 1535 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); 1536 return NULL; 1537 } 1538 1539 if (ch_sw_tm_ie_offset) { 1540 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1541 1542 if (!tm_ie) { 1543 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); 1544 dev_kfree_skb_any(skb); 1545 return NULL; 1546 } 1547 1548 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1549 } 1550 1551 tdls_dbg(sdata, 1552 "TDLS channel switch request template for %pM ch %d width %d\n", 1553 sta->sta.addr, chandef->chan->center_freq, chandef->width); 1554 return skb; 1555 } 1556 1557 int 1558 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, 1559 const u8 *addr, u8 oper_class, 1560 struct cfg80211_chan_def *chandef) 1561 { 1562 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1563 struct ieee80211_local *local = sdata->local; 1564 struct sta_info *sta; 1565 struct sk_buff *skb = NULL; 1566 u32 ch_sw_tm_ie; 1567 int ret; 1568 1569 mutex_lock(&local->sta_mtx); 1570 sta = sta_info_get(sdata, addr); 1571 if (!sta) { 1572 tdls_dbg(sdata, 1573 "Invalid TDLS peer %pM for channel switch request\n", 1574 addr); 1575 ret = -ENOENT; 1576 goto out; 1577 } 1578 1579 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { 1580 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", 1581 addr); 1582 ret = -ENOTSUPP; 1583 goto out; 1584 } 1585 1586 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, 1587 &ch_sw_tm_ie); 1588 if (!skb) { 1589 ret = -ENOENT; 1590 goto out; 1591 } 1592 1593 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, 1594 chandef, skb, ch_sw_tm_ie); 1595 if (!ret) 1596 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1597 1598 out: 1599 mutex_unlock(&local->sta_mtx); 1600 dev_kfree_skb_any(skb); 1601 return ret; 1602 } 1603 1604 void 1605 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, 1606 struct net_device *dev, 1607 const u8 *addr) 1608 { 1609 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1610 struct ieee80211_local *local = sdata->local; 1611 struct sta_info *sta; 1612 1613 mutex_lock(&local->sta_mtx); 1614 sta = sta_info_get(sdata, addr); 1615 if (!sta) { 1616 tdls_dbg(sdata, 1617 "Invalid TDLS peer %pM for channel switch cancel\n", 1618 addr); 1619 goto out; 1620 } 1621 1622 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 1623 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", 1624 addr); 1625 goto out; 1626 } 1627 1628 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 1629 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1630 1631 out: 1632 mutex_unlock(&local->sta_mtx); 1633 } 1634 1635 static struct sk_buff * 1636 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, 1637 u32 *ch_sw_tm_ie_offset) 1638 { 1639 struct ieee80211_sub_if_data *sdata = sta->sdata; 1640 struct sk_buff *skb; 1641 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; 1642 1643 /* initial timing are always zero in the template */ 1644 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); 1645 1646 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1647 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, 1648 0, 0, !sta->sta.tdls_initiator, 1649 extra_ies, sizeof(extra_ies), 0, NULL); 1650 if (!skb) 1651 return NULL; 1652 1653 skb = ieee80211_build_data_template(sdata, skb, 0); 1654 if (IS_ERR(skb)) { 1655 tdls_dbg(sdata, 1656 "Failed building TDLS channel switch resp frame\n"); 1657 return NULL; 1658 } 1659 1660 if (ch_sw_tm_ie_offset) { 1661 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1662 1663 if (!tm_ie) { 1664 tdls_dbg(sdata, 1665 "No switch timing IE in TDLS switch resp\n"); 1666 dev_kfree_skb_any(skb); 1667 return NULL; 1668 } 1669 1670 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1671 } 1672 1673 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", 1674 sta->sta.addr); 1675 return skb; 1676 } 1677 1678 static int 1679 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, 1680 struct sk_buff *skb) 1681 { 1682 struct ieee80211_local *local = sdata->local; 1683 struct ieee802_11_elems elems; 1684 struct sta_info *sta; 1685 struct ieee80211_tdls_data *tf = (void *)skb->data; 1686 bool local_initiator; 1687 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1688 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); 1689 struct ieee80211_tdls_ch_sw_params params = {}; 1690 int ret; 1691 1692 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 1693 params.timestamp = rx_status->device_timestamp; 1694 1695 if (skb->len < baselen) { 1696 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", 1697 skb->len); 1698 return -EINVAL; 1699 } 1700 1701 mutex_lock(&local->sta_mtx); 1702 sta = sta_info_get(sdata, tf->sa); 1703 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1704 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1705 tf->sa); 1706 ret = -EINVAL; 1707 goto out; 1708 } 1709 1710 params.sta = &sta->sta; 1711 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); 1712 if (params.status != 0) { 1713 ret = 0; 1714 goto call_drv; 1715 } 1716 1717 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, 1718 skb->len - baselen, false, &elems); 1719 if (elems.parse_error) { 1720 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); 1721 ret = -EINVAL; 1722 goto out; 1723 } 1724 1725 if (!elems.ch_sw_timing || !elems.lnk_id) { 1726 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); 1727 ret = -EINVAL; 1728 goto out; 1729 } 1730 1731 /* validate the initiator is set correctly */ 1732 local_initiator = 1733 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1734 if (local_initiator == sta->sta.tdls_initiator) { 1735 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1736 ret = -EINVAL; 1737 goto out; 1738 } 1739 1740 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); 1741 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); 1742 1743 params.tmpl_skb = 1744 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); 1745 if (!params.tmpl_skb) { 1746 ret = -ENOENT; 1747 goto out; 1748 } 1749 1750 call_drv: 1751 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1752 1753 tdls_dbg(sdata, 1754 "TDLS channel switch response received from %pM status %d\n", 1755 tf->sa, params.status); 1756 1757 out: 1758 mutex_unlock(&local->sta_mtx); 1759 dev_kfree_skb_any(params.tmpl_skb); 1760 return ret; 1761 } 1762 1763 static int 1764 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, 1765 struct sk_buff *skb) 1766 { 1767 struct ieee80211_local *local = sdata->local; 1768 struct ieee802_11_elems elems; 1769 struct cfg80211_chan_def chandef; 1770 struct ieee80211_channel *chan; 1771 enum nl80211_channel_type chan_type; 1772 int freq; 1773 u8 target_channel, oper_class; 1774 bool local_initiator; 1775 struct sta_info *sta; 1776 enum ieee80211_band band; 1777 struct ieee80211_tdls_data *tf = (void *)skb->data; 1778 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1779 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); 1780 struct ieee80211_tdls_ch_sw_params params = {}; 1781 int ret = 0; 1782 1783 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 1784 params.timestamp = rx_status->device_timestamp; 1785 1786 if (skb->len < baselen) { 1787 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", 1788 skb->len); 1789 return -EINVAL; 1790 } 1791 1792 target_channel = tf->u.chan_switch_req.target_channel; 1793 oper_class = tf->u.chan_switch_req.oper_class; 1794 1795 /* 1796 * We can't easily infer the channel band. The operating class is 1797 * ambiguous - there are multiple tables (US/Europe/JP/Global). The 1798 * solution here is to treat channels with number >14 as 5GHz ones, 1799 * and specifically check for the (oper_class, channel) combinations 1800 * where this doesn't hold. These are thankfully unique according to 1801 * IEEE802.11-2012. 1802 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as 1803 * valid here. 1804 */ 1805 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || 1806 oper_class == 4 || oper_class == 5 || oper_class == 6) && 1807 target_channel < 14) 1808 band = IEEE80211_BAND_5GHZ; 1809 else 1810 band = target_channel < 14 ? IEEE80211_BAND_2GHZ : 1811 IEEE80211_BAND_5GHZ; 1812 1813 freq = ieee80211_channel_to_frequency(target_channel, band); 1814 if (freq == 0) { 1815 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", 1816 target_channel); 1817 return -EINVAL; 1818 } 1819 1820 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 1821 if (!chan) { 1822 tdls_dbg(sdata, 1823 "Unsupported channel for TDLS chan switch: %d\n", 1824 target_channel); 1825 return -EINVAL; 1826 } 1827 1828 ieee802_11_parse_elems(tf->u.chan_switch_req.variable, 1829 skb->len - baselen, false, &elems); 1830 if (elems.parse_error) { 1831 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); 1832 return -EINVAL; 1833 } 1834 1835 if (!elems.ch_sw_timing || !elems.lnk_id) { 1836 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); 1837 return -EINVAL; 1838 } 1839 1840 if (!elems.sec_chan_offs) { 1841 chan_type = NL80211_CHAN_HT20; 1842 } else { 1843 switch (elems.sec_chan_offs->sec_chan_offs) { 1844 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 1845 chan_type = NL80211_CHAN_HT40PLUS; 1846 break; 1847 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 1848 chan_type = NL80211_CHAN_HT40MINUS; 1849 break; 1850 default: 1851 chan_type = NL80211_CHAN_HT20; 1852 break; 1853 } 1854 } 1855 1856 cfg80211_chandef_create(&chandef, chan, chan_type); 1857 1858 /* we will be active on the TDLS link */ 1859 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, 1860 sdata->wdev.iftype)) { 1861 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); 1862 return -EINVAL; 1863 } 1864 1865 mutex_lock(&local->sta_mtx); 1866 sta = sta_info_get(sdata, tf->sa); 1867 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1868 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1869 tf->sa); 1870 ret = -EINVAL; 1871 goto out; 1872 } 1873 1874 params.sta = &sta->sta; 1875 1876 /* validate the initiator is set correctly */ 1877 local_initiator = 1878 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1879 if (local_initiator == sta->sta.tdls_initiator) { 1880 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1881 ret = -EINVAL; 1882 goto out; 1883 } 1884 1885 /* peer should have known better */ 1886 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs && 1887 elems.sec_chan_offs->sec_chan_offs) { 1888 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); 1889 ret = -ENOTSUPP; 1890 goto out; 1891 } 1892 1893 params.chandef = &chandef; 1894 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); 1895 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); 1896 1897 params.tmpl_skb = 1898 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, 1899 ¶ms.ch_sw_tm_ie); 1900 if (!params.tmpl_skb) { 1901 ret = -ENOENT; 1902 goto out; 1903 } 1904 1905 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1906 1907 tdls_dbg(sdata, 1908 "TDLS ch switch request received from %pM ch %d width %d\n", 1909 tf->sa, params.chandef->chan->center_freq, 1910 params.chandef->width); 1911 out: 1912 mutex_unlock(&local->sta_mtx); 1913 dev_kfree_skb_any(params.tmpl_skb); 1914 return ret; 1915 } 1916 1917 static void 1918 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, 1919 struct sk_buff *skb) 1920 { 1921 struct ieee80211_tdls_data *tf = (void *)skb->data; 1922 struct wiphy *wiphy = sdata->local->hw.wiphy; 1923 1924 ASSERT_RTNL(); 1925 1926 /* make sure the driver supports it */ 1927 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) 1928 return; 1929 1930 /* we want to access the entire packet */ 1931 if (skb_linearize(skb)) 1932 return; 1933 /* 1934 * The packet/size was already validated by mac80211 Rx path, only look 1935 * at the action type. 1936 */ 1937 switch (tf->action_code) { 1938 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 1939 ieee80211_process_tdls_channel_switch_req(sdata, skb); 1940 break; 1941 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 1942 ieee80211_process_tdls_channel_switch_resp(sdata, skb); 1943 break; 1944 default: 1945 WARN_ON_ONCE(1); 1946 return; 1947 } 1948 } 1949 1950 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata) 1951 { 1952 struct sta_info *sta; 1953 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 1954 1955 rcu_read_lock(); 1956 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1957 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1958 !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 1959 continue; 1960 1961 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, 1962 NL80211_TDLS_TEARDOWN, reason, 1963 GFP_ATOMIC); 1964 } 1965 rcu_read_unlock(); 1966 } 1967 1968 void ieee80211_tdls_chsw_work(struct work_struct *wk) 1969 { 1970 struct ieee80211_local *local = 1971 container_of(wk, struct ieee80211_local, tdls_chsw_work); 1972 struct ieee80211_sub_if_data *sdata; 1973 struct sk_buff *skb; 1974 struct ieee80211_tdls_data *tf; 1975 1976 rtnl_lock(); 1977 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) { 1978 tf = (struct ieee80211_tdls_data *)skb->data; 1979 list_for_each_entry(sdata, &local->interfaces, list) { 1980 if (!ieee80211_sdata_running(sdata) || 1981 sdata->vif.type != NL80211_IFTYPE_STATION || 1982 !ether_addr_equal(tf->da, sdata->vif.addr)) 1983 continue; 1984 1985 ieee80211_process_tdls_channel_switch(sdata, skb); 1986 break; 1987 } 1988 1989 kfree_skb(skb); 1990 } 1991 rtnl_unlock(); 1992 } 1993