1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * mac80211 TDLS handling code 4 * 5 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2014, Intel Corporation 7 * Copyright 2014 Intel Mobile Communications GmbH 8 * Copyright 2015 - 2016 Intel Deutschland GmbH 9 * Copyright (C) 2019, 2021-2023 Intel Corporation 10 */ 11 12 #include <linux/ieee80211.h> 13 #include <linux/log2.h> 14 #include <net/cfg80211.h> 15 #include <linux/rtnetlink.h> 16 #include "ieee80211_i.h" 17 #include "driver-ops.h" 18 #include "rate.h" 19 #include "wme.h" 20 21 /* give usermode some time for retries in setting up the TDLS session */ 22 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ) 23 24 void ieee80211_tdls_peer_del_work(struct wiphy *wiphy, struct wiphy_work *wk) 25 { 26 struct ieee80211_sub_if_data *sdata; 27 struct ieee80211_local *local; 28 29 sdata = container_of(wk, struct ieee80211_sub_if_data, 30 u.mgd.tdls_peer_del_work.work); 31 local = sdata->local; 32 33 lockdep_assert_wiphy(local->hw.wiphy); 34 35 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) { 36 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer); 37 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer); 38 eth_zero_addr(sdata->u.mgd.tdls_peer); 39 } 40 } 41 42 static void ieee80211_tdls_add_ext_capab(struct ieee80211_link_data *link, 43 struct sk_buff *skb) 44 { 45 struct ieee80211_sub_if_data *sdata = link->sdata; 46 struct ieee80211_local *local = sdata->local; 47 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 48 bool chan_switch = local->hw.wiphy->features & 49 NL80211_FEATURE_TDLS_CHANNEL_SWITCH; 50 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) && 51 !ifmgd->tdls_wider_bw_prohibited; 52 bool buffer_sta = ieee80211_hw_check(&local->hw, 53 SUPPORTS_TDLS_BUFFER_STA); 54 struct ieee80211_supported_band *sband = ieee80211_get_link_sband(link); 55 bool vht = sband && sband->vht_cap.vht_supported; 56 u8 *pos = skb_put(skb, 10); 57 58 *pos++ = WLAN_EID_EXT_CAPABILITY; 59 *pos++ = 8; /* len */ 60 *pos++ = 0x0; 61 *pos++ = 0x0; 62 *pos++ = 0x0; 63 *pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) | 64 (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0); 65 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED; 66 *pos++ = 0; 67 *pos++ = 0; 68 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0; 69 } 70 71 static u8 72 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata, 73 struct sk_buff *skb, u16 start, u16 end, 74 u16 spacing) 75 { 76 u8 subband_cnt = 0, ch_cnt = 0; 77 struct ieee80211_channel *ch; 78 struct cfg80211_chan_def chandef; 79 int i, subband_start; 80 struct wiphy *wiphy = sdata->local->hw.wiphy; 81 82 for (i = start; i <= end; i += spacing) { 83 if (!ch_cnt) 84 subband_start = i; 85 86 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i); 87 if (ch) { 88 /* we will be active on the channel */ 89 cfg80211_chandef_create(&chandef, ch, 90 NL80211_CHAN_NO_HT); 91 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef, 92 sdata->wdev.iftype)) { 93 ch_cnt++; 94 /* 95 * check if the next channel is also part of 96 * this allowed range 97 */ 98 continue; 99 } 100 } 101 102 /* 103 * we've reached the end of a range, with allowed channels 104 * found 105 */ 106 if (ch_cnt) { 107 u8 *pos = skb_put(skb, 2); 108 *pos++ = ieee80211_frequency_to_channel(subband_start); 109 *pos++ = ch_cnt; 110 111 subband_cnt++; 112 ch_cnt = 0; 113 } 114 } 115 116 /* all channels in the requested range are allowed - add them here */ 117 if (ch_cnt) { 118 u8 *pos = skb_put(skb, 2); 119 *pos++ = ieee80211_frequency_to_channel(subband_start); 120 *pos++ = ch_cnt; 121 122 subband_cnt++; 123 } 124 125 return subband_cnt; 126 } 127 128 static void 129 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata, 130 struct sk_buff *skb) 131 { 132 /* 133 * Add possible channels for TDLS. These are channels that are allowed 134 * to be active. 135 */ 136 u8 subband_cnt; 137 u8 *pos = skb_put(skb, 2); 138 139 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 140 141 /* 142 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as 143 * this doesn't happen in real world scenarios. 144 */ 145 146 /* 2GHz, with 5MHz spacing */ 147 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5); 148 149 /* 5GHz, with 20MHz spacing */ 150 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20); 151 152 /* length */ 153 *pos = 2 * subband_cnt; 154 } 155 156 static void ieee80211_tdls_add_oper_classes(struct ieee80211_link_data *link, 157 struct sk_buff *skb) 158 { 159 u8 *pos; 160 u8 op_class; 161 162 if (!ieee80211_chandef_to_operating_class(&link->conf->chandef, 163 &op_class)) 164 return; 165 166 pos = skb_put(skb, 4); 167 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES; 168 *pos++ = 2; /* len */ 169 170 *pos++ = op_class; 171 *pos++ = op_class; /* give current operating class as alternate too */ 172 } 173 174 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb) 175 { 176 u8 *pos = skb_put(skb, 3); 177 178 *pos++ = WLAN_EID_BSS_COEX_2040; 179 *pos++ = 1; /* len */ 180 181 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST; 182 } 183 184 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_link_data *link, 185 u16 status_code) 186 { 187 struct ieee80211_supported_band *sband; 188 189 /* The capability will be 0 when sending a failure code */ 190 if (status_code != 0) 191 return 0; 192 193 sband = ieee80211_get_link_sband(link); 194 195 if (sband && sband->band == NL80211_BAND_2GHZ) { 196 return WLAN_CAPABILITY_SHORT_SLOT_TIME | 197 WLAN_CAPABILITY_SHORT_PREAMBLE; 198 } 199 200 return 0; 201 } 202 203 static void ieee80211_tdls_add_link_ie(struct ieee80211_link_data *link, 204 struct sk_buff *skb, const u8 *peer, 205 bool initiator) 206 { 207 struct ieee80211_sub_if_data *sdata = link->sdata; 208 struct ieee80211_tdls_lnkie *lnkid; 209 const u8 *init_addr, *rsp_addr; 210 211 if (initiator) { 212 init_addr = sdata->vif.addr; 213 rsp_addr = peer; 214 } else { 215 init_addr = peer; 216 rsp_addr = sdata->vif.addr; 217 } 218 219 lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie)); 220 221 lnkid->ie_type = WLAN_EID_LINK_ID; 222 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2; 223 224 memcpy(lnkid->bssid, link->u.mgd.bssid, ETH_ALEN); 225 memcpy(lnkid->init_sta, init_addr, ETH_ALEN); 226 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN); 227 } 228 229 static void 230 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 231 { 232 u8 *pos = skb_put(skb, 4); 233 234 *pos++ = WLAN_EID_AID; 235 *pos++ = 2; /* len */ 236 put_unaligned_le16(sdata->vif.cfg.aid, pos); 237 } 238 239 /* translate numbering in the WMM parameter IE to the mac80211 notation */ 240 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac) 241 { 242 switch (ac) { 243 default: 244 WARN_ON_ONCE(1); 245 fallthrough; 246 case 0: 247 return IEEE80211_AC_BE; 248 case 1: 249 return IEEE80211_AC_BK; 250 case 2: 251 return IEEE80211_AC_VI; 252 case 3: 253 return IEEE80211_AC_VO; 254 } 255 } 256 257 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci) 258 { 259 u8 ret; 260 261 ret = aifsn & 0x0f; 262 if (acm) 263 ret |= 0x10; 264 ret |= (aci << 5) & 0x60; 265 return ret; 266 } 267 268 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max) 269 { 270 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) | 271 ((ilog2(cw_max + 1) << 0x4) & 0xf0); 272 } 273 274 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata, 275 struct sk_buff *skb) 276 { 277 struct ieee80211_wmm_param_ie *wmm; 278 struct ieee80211_tx_queue_params *txq; 279 int i; 280 281 wmm = skb_put_zero(skb, sizeof(*wmm)); 282 283 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC; 284 wmm->len = sizeof(*wmm) - 2; 285 286 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */ 287 wmm->oui[1] = 0x50; 288 wmm->oui[2] = 0xf2; 289 wmm->oui_type = 2; /* WME */ 290 wmm->oui_subtype = 1; /* WME param */ 291 wmm->version = 1; /* WME ver */ 292 wmm->qos_info = 0; /* U-APSD not in use */ 293 294 /* 295 * Use the EDCA parameters defined for the BSS, or default if the AP 296 * doesn't support it, as mandated by 802.11-2012 section 10.22.4 297 */ 298 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 299 txq = &sdata->deflink.tx_conf[ieee80211_ac_from_wmm(i)]; 300 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs, 301 txq->acm, i); 302 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max); 303 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop); 304 } 305 } 306 307 static void 308 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata, 309 struct sta_info *sta) 310 { 311 /* IEEE802.11ac-2013 Table E-4 */ 312 static const u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 }; 313 struct cfg80211_chan_def uc = sta->tdls_chandef; 314 enum nl80211_chan_width max_width = 315 ieee80211_sta_cap_chan_bw(&sta->deflink); 316 int i; 317 318 /* only support upgrading non-narrow channels up to 80Mhz */ 319 if (max_width == NL80211_CHAN_WIDTH_5 || 320 max_width == NL80211_CHAN_WIDTH_10) 321 return; 322 323 if (max_width > NL80211_CHAN_WIDTH_80) 324 max_width = NL80211_CHAN_WIDTH_80; 325 326 if (uc.width >= max_width) 327 return; 328 /* 329 * Channel usage constrains in the IEEE802.11ac-2013 specification only 330 * allow expanding a 20MHz channel to 80MHz in a single way. In 331 * addition, there are no 40MHz allowed channels that are not part of 332 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here). 333 */ 334 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++) 335 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) { 336 uc.center_freq1 = centers_80mhz[i]; 337 uc.center_freq2 = 0; 338 uc.width = NL80211_CHAN_WIDTH_80; 339 break; 340 } 341 342 if (!uc.center_freq1) 343 return; 344 345 /* proceed to downgrade the chandef until usable or the same as AP BW */ 346 while (uc.width > max_width || 347 (uc.width > sta->tdls_chandef.width && 348 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc, 349 sdata->wdev.iftype))) 350 ieee80211_chandef_downgrade(&uc); 351 352 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) { 353 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n", 354 sta->tdls_chandef.width, uc.width); 355 356 /* 357 * the station is not yet authorized when BW upgrade is done, 358 * locking is not required 359 */ 360 sta->tdls_chandef = uc; 361 } 362 } 363 364 static void 365 ieee80211_tdls_add_setup_start_ies(struct ieee80211_link_data *link, 366 struct sk_buff *skb, const u8 *peer, 367 u8 action_code, bool initiator, 368 const u8 *extra_ies, size_t extra_ies_len) 369 { 370 struct ieee80211_sub_if_data *sdata = link->sdata; 371 struct ieee80211_supported_band *sband; 372 struct ieee80211_local *local = sdata->local; 373 struct ieee80211_sta_ht_cap ht_cap; 374 struct ieee80211_sta_vht_cap vht_cap; 375 const struct ieee80211_sta_he_cap *he_cap; 376 const struct ieee80211_sta_eht_cap *eht_cap; 377 struct sta_info *sta = NULL; 378 size_t offset = 0, noffset; 379 u8 *pos; 380 381 sband = ieee80211_get_link_sband(link); 382 if (WARN_ON_ONCE(!sband)) 383 return; 384 385 ieee80211_add_srates_ie(sdata, skb, false, sband->band); 386 ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band); 387 ieee80211_tdls_add_supp_channels(sdata, skb); 388 389 /* add any custom IEs that go before Extended Capabilities */ 390 if (extra_ies_len) { 391 static const u8 before_ext_cap[] = { 392 WLAN_EID_SUPP_RATES, 393 WLAN_EID_COUNTRY, 394 WLAN_EID_EXT_SUPP_RATES, 395 WLAN_EID_SUPPORTED_CHANNELS, 396 WLAN_EID_RSN, 397 }; 398 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 399 before_ext_cap, 400 ARRAY_SIZE(before_ext_cap), 401 offset); 402 skb_put_data(skb, extra_ies + offset, noffset - offset); 403 offset = noffset; 404 } 405 406 ieee80211_tdls_add_ext_capab(link, skb); 407 408 /* add the QoS element if we support it */ 409 if (local->hw.queues >= IEEE80211_NUM_ACS && 410 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) 411 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */ 412 413 /* add any custom IEs that go before HT capabilities */ 414 if (extra_ies_len) { 415 static const u8 before_ht_cap[] = { 416 WLAN_EID_SUPP_RATES, 417 WLAN_EID_COUNTRY, 418 WLAN_EID_EXT_SUPP_RATES, 419 WLAN_EID_SUPPORTED_CHANNELS, 420 WLAN_EID_RSN, 421 WLAN_EID_EXT_CAPABILITY, 422 WLAN_EID_QOS_CAPA, 423 WLAN_EID_FAST_BSS_TRANSITION, 424 WLAN_EID_TIMEOUT_INTERVAL, 425 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 426 }; 427 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 428 before_ht_cap, 429 ARRAY_SIZE(before_ht_cap), 430 offset); 431 skb_put_data(skb, extra_ies + offset, noffset - offset); 432 offset = noffset; 433 } 434 435 /* we should have the peer STA if we're already responding */ 436 if (action_code == WLAN_TDLS_SETUP_RESPONSE) { 437 sta = sta_info_get(sdata, peer); 438 if (WARN_ON_ONCE(!sta)) 439 return; 440 441 sta->tdls_chandef = link->conf->chandef; 442 } 443 444 ieee80211_tdls_add_oper_classes(link, skb); 445 446 /* 447 * with TDLS we can switch channels, and HT-caps are not necessarily 448 * the same on all bands. The specification limits the setup to a 449 * single HT-cap, so use the current band for now. 450 */ 451 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 452 453 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 454 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 455 ht_cap.ht_supported) { 456 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 457 458 /* disable SMPS in TDLS initiator */ 459 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED 460 << IEEE80211_HT_CAP_SM_PS_SHIFT; 461 462 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 463 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 464 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 465 ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) { 466 /* the peer caps are already intersected with our own */ 467 memcpy(&ht_cap, &sta->sta.deflink.ht_cap, sizeof(ht_cap)); 468 469 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 470 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 471 } 472 473 if (ht_cap.ht_supported && 474 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 475 ieee80211_tdls_add_bss_coex_ie(skb); 476 477 ieee80211_tdls_add_link_ie(link, skb, peer, initiator); 478 479 /* add any custom IEs that go before VHT capabilities */ 480 if (extra_ies_len) { 481 static const u8 before_vht_cap[] = { 482 WLAN_EID_SUPP_RATES, 483 WLAN_EID_COUNTRY, 484 WLAN_EID_EXT_SUPP_RATES, 485 WLAN_EID_SUPPORTED_CHANNELS, 486 WLAN_EID_RSN, 487 WLAN_EID_EXT_CAPABILITY, 488 WLAN_EID_QOS_CAPA, 489 WLAN_EID_FAST_BSS_TRANSITION, 490 WLAN_EID_TIMEOUT_INTERVAL, 491 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 492 WLAN_EID_MULTI_BAND, 493 }; 494 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 495 before_vht_cap, 496 ARRAY_SIZE(before_vht_cap), 497 offset); 498 skb_put_data(skb, extra_ies + offset, noffset - offset); 499 offset = noffset; 500 } 501 502 /* add AID if VHT, HE or EHT capabilities supported */ 503 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 504 he_cap = ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif); 505 eht_cap = ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif); 506 if ((vht_cap.vht_supported || he_cap || eht_cap) && 507 (action_code == WLAN_TDLS_SETUP_REQUEST || 508 action_code == WLAN_TDLS_SETUP_RESPONSE)) 509 ieee80211_tdls_add_aid(sdata, skb); 510 511 /* build the VHT-cap similarly to the HT-cap */ 512 if ((action_code == WLAN_TDLS_SETUP_REQUEST || 513 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && 514 vht_cap.vht_supported) { 515 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 516 517 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 518 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 519 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && 520 vht_cap.vht_supported && sta->sta.deflink.vht_cap.vht_supported) { 521 /* the peer caps are already intersected with our own */ 522 memcpy(&vht_cap, &sta->sta.deflink.vht_cap, sizeof(vht_cap)); 523 524 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 525 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); 526 527 /* 528 * if both peers support WIDER_BW, we can expand the chandef to 529 * a wider compatible one, up to 80MHz 530 */ 531 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 532 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 533 } 534 535 /* add any custom IEs that go before HE capabilities */ 536 if (extra_ies_len) { 537 static const u8 before_he_cap[] = { 538 WLAN_EID_EXTENSION, 539 WLAN_EID_EXT_FILS_REQ_PARAMS, 540 WLAN_EID_AP_CSN, 541 }; 542 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 543 before_he_cap, 544 ARRAY_SIZE(before_he_cap), 545 offset); 546 skb_put_data(skb, extra_ies + offset, noffset - offset); 547 offset = noffset; 548 } 549 550 /* build the HE-cap from sband */ 551 if (he_cap && 552 (action_code == WLAN_TDLS_SETUP_REQUEST || 553 action_code == WLAN_TDLS_SETUP_RESPONSE || 554 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES)) { 555 __le16 he_6ghz_capa; 556 u8 cap_size; 557 558 cap_size = 559 2 + 1 + sizeof(he_cap->he_cap_elem) + 560 ieee80211_he_mcs_nss_size(&he_cap->he_cap_elem) + 561 ieee80211_he_ppe_size(he_cap->ppe_thres[0], 562 he_cap->he_cap_elem.phy_cap_info); 563 pos = skb_put(skb, cap_size); 564 pos = ieee80211_ie_build_he_cap(0, pos, he_cap, pos + cap_size); 565 566 /* Build HE 6Ghz capa IE from sband */ 567 if (sband->band == NL80211_BAND_6GHZ) { 568 cap_size = 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa); 569 pos = skb_put(skb, cap_size); 570 he_6ghz_capa = 571 ieee80211_get_he_6ghz_capa_vif(sband, &sdata->vif); 572 pos = ieee80211_write_he_6ghz_cap(pos, he_6ghz_capa, 573 pos + cap_size); 574 } 575 } 576 577 /* add any custom IEs that go before EHT capabilities */ 578 if (extra_ies_len) { 579 static const u8 before_he_cap[] = { 580 WLAN_EID_EXTENSION, 581 WLAN_EID_EXT_FILS_REQ_PARAMS, 582 WLAN_EID_AP_CSN, 583 }; 584 585 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 586 before_he_cap, 587 ARRAY_SIZE(before_he_cap), 588 offset); 589 skb_put_data(skb, extra_ies + offset, noffset - offset); 590 offset = noffset; 591 } 592 593 /* build the EHT-cap from sband */ 594 if (he_cap && eht_cap && 595 (action_code == WLAN_TDLS_SETUP_REQUEST || 596 action_code == WLAN_TDLS_SETUP_RESPONSE || 597 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES)) { 598 u8 cap_size; 599 600 cap_size = 601 2 + 1 + sizeof(eht_cap->eht_cap_elem) + 602 ieee80211_eht_mcs_nss_size(&he_cap->he_cap_elem, 603 &eht_cap->eht_cap_elem, false) + 604 ieee80211_eht_ppe_size(eht_cap->eht_ppe_thres[0], 605 eht_cap->eht_cap_elem.phy_cap_info); 606 pos = skb_put(skb, cap_size); 607 ieee80211_ie_build_eht_cap(pos, he_cap, eht_cap, pos + cap_size, false); 608 } 609 610 /* add any remaining IEs */ 611 if (extra_ies_len) { 612 noffset = extra_ies_len; 613 skb_put_data(skb, extra_ies + offset, noffset - offset); 614 } 615 616 } 617 618 static void 619 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_link_data *link, 620 struct sk_buff *skb, const u8 *peer, 621 bool initiator, const u8 *extra_ies, 622 size_t extra_ies_len) 623 { 624 struct ieee80211_sub_if_data *sdata = link->sdata; 625 struct ieee80211_local *local = sdata->local; 626 size_t offset = 0, noffset; 627 struct sta_info *sta, *ap_sta; 628 struct ieee80211_supported_band *sband; 629 u8 *pos; 630 631 sband = ieee80211_get_link_sband(link); 632 if (WARN_ON_ONCE(!sband)) 633 return; 634 635 sta = sta_info_get(sdata, peer); 636 ap_sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 637 638 if (WARN_ON_ONCE(!sta || !ap_sta)) 639 return; 640 641 sta->tdls_chandef = link->conf->chandef; 642 643 /* add any custom IEs that go before the QoS IE */ 644 if (extra_ies_len) { 645 static const u8 before_qos[] = { 646 WLAN_EID_RSN, 647 }; 648 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 649 before_qos, 650 ARRAY_SIZE(before_qos), 651 offset); 652 skb_put_data(skb, extra_ies + offset, noffset - offset); 653 offset = noffset; 654 } 655 656 /* add the QoS param IE if both the peer and we support it */ 657 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme) 658 ieee80211_tdls_add_wmm_param_ie(sdata, skb); 659 660 /* add any custom IEs that go before HT operation */ 661 if (extra_ies_len) { 662 static const u8 before_ht_op[] = { 663 WLAN_EID_RSN, 664 WLAN_EID_QOS_CAPA, 665 WLAN_EID_FAST_BSS_TRANSITION, 666 WLAN_EID_TIMEOUT_INTERVAL, 667 }; 668 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 669 before_ht_op, 670 ARRAY_SIZE(before_ht_op), 671 offset); 672 skb_put_data(skb, extra_ies + offset, noffset - offset); 673 offset = noffset; 674 } 675 676 /* 677 * if HT support is only added in TDLS, we need an HT-operation IE. 678 * add the IE as required by IEEE802.11-2012 9.23.3.2. 679 */ 680 if (!ap_sta->sta.deflink.ht_cap.ht_supported && sta->sta.deflink.ht_cap.ht_supported) { 681 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 682 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 683 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 684 685 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 686 ieee80211_ie_build_ht_oper(pos, &sta->sta.deflink.ht_cap, 687 &link->conf->chandef, prot, 688 true); 689 } 690 691 ieee80211_tdls_add_link_ie(link, skb, peer, initiator); 692 693 /* only include VHT-operation if not on the 2.4GHz band */ 694 if (sband->band != NL80211_BAND_2GHZ && 695 sta->sta.deflink.vht_cap.vht_supported) { 696 /* 697 * if both peers support WIDER_BW, we can expand the chandef to 698 * a wider compatible one, up to 80MHz 699 */ 700 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) 701 ieee80211_tdls_chandef_vht_upgrade(sdata, sta); 702 703 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 704 ieee80211_ie_build_vht_oper(pos, &sta->sta.deflink.vht_cap, 705 &sta->tdls_chandef); 706 } 707 708 /* add any remaining IEs */ 709 if (extra_ies_len) { 710 noffset = extra_ies_len; 711 skb_put_data(skb, extra_ies + offset, noffset - offset); 712 } 713 } 714 715 static void 716 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_link_data *link, 717 struct sk_buff *skb, const u8 *peer, 718 bool initiator, const u8 *extra_ies, 719 size_t extra_ies_len, u8 oper_class, 720 struct cfg80211_chan_def *chandef) 721 { 722 struct ieee80211_tdls_data *tf; 723 size_t offset = 0, noffset; 724 725 if (WARN_ON_ONCE(!chandef)) 726 return; 727 728 tf = (void *)skb->data; 729 tf->u.chan_switch_req.target_channel = 730 ieee80211_frequency_to_channel(chandef->chan->center_freq); 731 tf->u.chan_switch_req.oper_class = oper_class; 732 733 if (extra_ies_len) { 734 static const u8 before_lnkie[] = { 735 WLAN_EID_SECONDARY_CHANNEL_OFFSET, 736 }; 737 noffset = ieee80211_ie_split(extra_ies, extra_ies_len, 738 before_lnkie, 739 ARRAY_SIZE(before_lnkie), 740 offset); 741 skb_put_data(skb, extra_ies + offset, noffset - offset); 742 offset = noffset; 743 } 744 745 ieee80211_tdls_add_link_ie(link, skb, peer, initiator); 746 747 /* add any remaining IEs */ 748 if (extra_ies_len) { 749 noffset = extra_ies_len; 750 skb_put_data(skb, extra_ies + offset, noffset - offset); 751 } 752 } 753 754 static void 755 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_link_data *link, 756 struct sk_buff *skb, const u8 *peer, 757 u16 status_code, bool initiator, 758 const u8 *extra_ies, 759 size_t extra_ies_len) 760 { 761 if (status_code == 0) 762 ieee80211_tdls_add_link_ie(link, skb, peer, initiator); 763 764 if (extra_ies_len) 765 skb_put_data(skb, extra_ies, extra_ies_len); 766 } 767 768 static void ieee80211_tdls_add_ies(struct ieee80211_link_data *link, 769 struct sk_buff *skb, const u8 *peer, 770 u8 action_code, u16 status_code, 771 bool initiator, const u8 *extra_ies, 772 size_t extra_ies_len, u8 oper_class, 773 struct cfg80211_chan_def *chandef) 774 { 775 switch (action_code) { 776 case WLAN_TDLS_SETUP_REQUEST: 777 case WLAN_TDLS_SETUP_RESPONSE: 778 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 779 if (status_code == 0) 780 ieee80211_tdls_add_setup_start_ies(link, 781 skb, peer, 782 action_code, 783 initiator, 784 extra_ies, 785 extra_ies_len); 786 break; 787 case WLAN_TDLS_SETUP_CONFIRM: 788 if (status_code == 0) 789 ieee80211_tdls_add_setup_cfm_ies(link, skb, peer, 790 initiator, extra_ies, 791 extra_ies_len); 792 break; 793 case WLAN_TDLS_TEARDOWN: 794 case WLAN_TDLS_DISCOVERY_REQUEST: 795 if (extra_ies_len) 796 skb_put_data(skb, extra_ies, extra_ies_len); 797 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN) 798 ieee80211_tdls_add_link_ie(link, skb, 799 peer, initiator); 800 break; 801 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 802 ieee80211_tdls_add_chan_switch_req_ies(link, skb, peer, 803 initiator, extra_ies, 804 extra_ies_len, 805 oper_class, chandef); 806 break; 807 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 808 ieee80211_tdls_add_chan_switch_resp_ies(link, skb, peer, 809 status_code, 810 initiator, extra_ies, 811 extra_ies_len); 812 break; 813 } 814 815 } 816 817 static int 818 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev, 819 struct ieee80211_link_data *link, 820 const u8 *peer, u8 action_code, u8 dialog_token, 821 u16 status_code, struct sk_buff *skb) 822 { 823 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 824 struct ieee80211_tdls_data *tf; 825 826 tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u)); 827 828 memcpy(tf->da, peer, ETH_ALEN); 829 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN); 830 tf->ether_type = cpu_to_be16(ETH_P_TDLS); 831 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE; 832 833 /* network header is after the ethernet header */ 834 skb_set_network_header(skb, ETH_HLEN); 835 836 switch (action_code) { 837 case WLAN_TDLS_SETUP_REQUEST: 838 tf->category = WLAN_CATEGORY_TDLS; 839 tf->action_code = WLAN_TDLS_SETUP_REQUEST; 840 841 skb_put(skb, sizeof(tf->u.setup_req)); 842 tf->u.setup_req.dialog_token = dialog_token; 843 tf->u.setup_req.capability = 844 cpu_to_le16(ieee80211_get_tdls_sta_capab(link, 845 status_code)); 846 break; 847 case WLAN_TDLS_SETUP_RESPONSE: 848 tf->category = WLAN_CATEGORY_TDLS; 849 tf->action_code = WLAN_TDLS_SETUP_RESPONSE; 850 851 skb_put(skb, sizeof(tf->u.setup_resp)); 852 tf->u.setup_resp.status_code = cpu_to_le16(status_code); 853 tf->u.setup_resp.dialog_token = dialog_token; 854 tf->u.setup_resp.capability = 855 cpu_to_le16(ieee80211_get_tdls_sta_capab(link, 856 status_code)); 857 break; 858 case WLAN_TDLS_SETUP_CONFIRM: 859 tf->category = WLAN_CATEGORY_TDLS; 860 tf->action_code = WLAN_TDLS_SETUP_CONFIRM; 861 862 skb_put(skb, sizeof(tf->u.setup_cfm)); 863 tf->u.setup_cfm.status_code = cpu_to_le16(status_code); 864 tf->u.setup_cfm.dialog_token = dialog_token; 865 break; 866 case WLAN_TDLS_TEARDOWN: 867 tf->category = WLAN_CATEGORY_TDLS; 868 tf->action_code = WLAN_TDLS_TEARDOWN; 869 870 skb_put(skb, sizeof(tf->u.teardown)); 871 tf->u.teardown.reason_code = cpu_to_le16(status_code); 872 break; 873 case WLAN_TDLS_DISCOVERY_REQUEST: 874 tf->category = WLAN_CATEGORY_TDLS; 875 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST; 876 877 skb_put(skb, sizeof(tf->u.discover_req)); 878 tf->u.discover_req.dialog_token = dialog_token; 879 break; 880 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 881 tf->category = WLAN_CATEGORY_TDLS; 882 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 883 884 skb_put(skb, sizeof(tf->u.chan_switch_req)); 885 break; 886 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 887 tf->category = WLAN_CATEGORY_TDLS; 888 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 889 890 skb_put(skb, sizeof(tf->u.chan_switch_resp)); 891 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code); 892 break; 893 default: 894 return -EINVAL; 895 } 896 897 return 0; 898 } 899 900 static int 901 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev, 902 const u8 *peer, struct ieee80211_link_data *link, 903 u8 action_code, u8 dialog_token, 904 u16 status_code, struct sk_buff *skb) 905 { 906 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 907 struct ieee80211_mgmt *mgmt; 908 909 mgmt = skb_put_zero(skb, 24); 910 memcpy(mgmt->da, peer, ETH_ALEN); 911 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 912 memcpy(mgmt->bssid, link->u.mgd.bssid, ETH_ALEN); 913 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 914 IEEE80211_STYPE_ACTION); 915 916 switch (action_code) { 917 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 918 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp)); 919 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC; 920 mgmt->u.action.u.tdls_discover_resp.action_code = 921 WLAN_PUB_ACTION_TDLS_DISCOVER_RES; 922 mgmt->u.action.u.tdls_discover_resp.dialog_token = 923 dialog_token; 924 mgmt->u.action.u.tdls_discover_resp.capability = 925 cpu_to_le16(ieee80211_get_tdls_sta_capab(link, 926 status_code)); 927 break; 928 default: 929 return -EINVAL; 930 } 931 932 return 0; 933 } 934 935 static struct sk_buff * 936 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata, 937 const u8 *peer, int link_id, 938 u8 action_code, u8 dialog_token, 939 u16 status_code, bool initiator, 940 const u8 *extra_ies, size_t extra_ies_len, 941 u8 oper_class, 942 struct cfg80211_chan_def *chandef) 943 { 944 struct ieee80211_local *local = sdata->local; 945 struct sk_buff *skb; 946 int ret; 947 struct ieee80211_link_data *link; 948 949 link_id = link_id >= 0 ? link_id : 0; 950 rcu_read_lock(); 951 link = rcu_dereference(sdata->link[link_id]); 952 if (WARN_ON(!link)) 953 goto unlock; 954 955 skb = netdev_alloc_skb(sdata->dev, 956 local->hw.extra_tx_headroom + 957 max(sizeof(struct ieee80211_mgmt), 958 sizeof(struct ieee80211_tdls_data)) + 959 50 + /* supported rates */ 960 10 + /* ext capab */ 961 26 + /* max(WMM-info, WMM-param) */ 962 2 + max(sizeof(struct ieee80211_ht_cap), 963 sizeof(struct ieee80211_ht_operation)) + 964 2 + max(sizeof(struct ieee80211_vht_cap), 965 sizeof(struct ieee80211_vht_operation)) + 966 2 + 1 + sizeof(struct ieee80211_he_cap_elem) + 967 sizeof(struct ieee80211_he_mcs_nss_supp) + 968 IEEE80211_HE_PPE_THRES_MAX_LEN + 969 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) + 970 2 + 1 + sizeof(struct ieee80211_eht_cap_elem) + 971 sizeof(struct ieee80211_eht_mcs_nss_supp) + 972 IEEE80211_EHT_PPE_THRES_MAX_LEN + 973 50 + /* supported channels */ 974 3 + /* 40/20 BSS coex */ 975 4 + /* AID */ 976 4 + /* oper classes */ 977 extra_ies_len + 978 sizeof(struct ieee80211_tdls_lnkie)); 979 if (!skb) 980 goto unlock; 981 982 skb_reserve(skb, local->hw.extra_tx_headroom); 983 984 switch (action_code) { 985 case WLAN_TDLS_SETUP_REQUEST: 986 case WLAN_TDLS_SETUP_RESPONSE: 987 case WLAN_TDLS_SETUP_CONFIRM: 988 case WLAN_TDLS_TEARDOWN: 989 case WLAN_TDLS_DISCOVERY_REQUEST: 990 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 991 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 992 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy, 993 sdata->dev, link, peer, 994 action_code, dialog_token, 995 status_code, skb); 996 break; 997 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 998 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev, 999 peer, link, action_code, 1000 dialog_token, status_code, 1001 skb); 1002 break; 1003 default: 1004 ret = -EOPNOTSUPP; 1005 break; 1006 } 1007 1008 if (ret < 0) 1009 goto fail; 1010 1011 ieee80211_tdls_add_ies(link, skb, peer, action_code, status_code, 1012 initiator, extra_ies, extra_ies_len, oper_class, 1013 chandef); 1014 rcu_read_unlock(); 1015 return skb; 1016 1017 fail: 1018 dev_kfree_skb(skb); 1019 unlock: 1020 rcu_read_unlock(); 1021 return NULL; 1022 } 1023 1024 static int 1025 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, 1026 const u8 *peer, int link_id, 1027 u8 action_code, u8 dialog_token, 1028 u16 status_code, u32 peer_capability, 1029 bool initiator, const u8 *extra_ies, 1030 size_t extra_ies_len, u8 oper_class, 1031 struct cfg80211_chan_def *chandef) 1032 { 1033 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1034 struct sk_buff *skb = NULL; 1035 struct sta_info *sta; 1036 u32 flags = 0; 1037 int ret = 0; 1038 1039 rcu_read_lock(); 1040 sta = sta_info_get(sdata, peer); 1041 1042 /* infer the initiator if we can, to support old userspace */ 1043 switch (action_code) { 1044 case WLAN_TDLS_SETUP_REQUEST: 1045 if (sta) { 1046 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 1047 sta->sta.tdls_initiator = false; 1048 } 1049 fallthrough; 1050 case WLAN_TDLS_SETUP_CONFIRM: 1051 case WLAN_TDLS_DISCOVERY_REQUEST: 1052 initiator = true; 1053 break; 1054 case WLAN_TDLS_SETUP_RESPONSE: 1055 /* 1056 * In some testing scenarios, we send a request and response. 1057 * Make the last packet sent take effect for the initiator 1058 * value. 1059 */ 1060 if (sta) { 1061 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); 1062 sta->sta.tdls_initiator = true; 1063 } 1064 fallthrough; 1065 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1066 initiator = false; 1067 break; 1068 case WLAN_TDLS_TEARDOWN: 1069 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 1070 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 1071 /* any value is ok */ 1072 break; 1073 default: 1074 ret = -EOPNOTSUPP; 1075 break; 1076 } 1077 1078 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR)) 1079 initiator = true; 1080 1081 rcu_read_unlock(); 1082 if (ret < 0) 1083 goto fail; 1084 1085 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, 1086 link_id, action_code, 1087 dialog_token, status_code, 1088 initiator, extra_ies, 1089 extra_ies_len, oper_class, 1090 chandef); 1091 if (!skb) { 1092 ret = -EINVAL; 1093 goto fail; 1094 } 1095 1096 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { 1097 ieee80211_tx_skb_tid(sdata, skb, 7, link_id); 1098 return 0; 1099 } 1100 1101 /* 1102 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise 1103 * we should default to AC_VI. 1104 */ 1105 switch (action_code) { 1106 case WLAN_TDLS_SETUP_REQUEST: 1107 case WLAN_TDLS_SETUP_RESPONSE: 1108 skb->priority = 256 + 2; 1109 break; 1110 default: 1111 skb->priority = 256 + 5; 1112 break; 1113 } 1114 1115 /* 1116 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress. 1117 * Later, if no ACK is returned from peer, we will re-send the teardown 1118 * packet through the AP. 1119 */ 1120 if ((action_code == WLAN_TDLS_TEARDOWN) && 1121 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 1122 bool try_resend; /* Should we keep skb for possible resend */ 1123 1124 /* If not sending directly to peer - no point in keeping skb */ 1125 rcu_read_lock(); 1126 sta = sta_info_get(sdata, peer); 1127 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1128 rcu_read_unlock(); 1129 1130 spin_lock_bh(&sdata->u.mgd.teardown_lock); 1131 if (try_resend && !sdata->u.mgd.teardown_skb) { 1132 /* Mark it as requiring TX status callback */ 1133 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 1134 IEEE80211_TX_INTFL_MLME_CONN_TX; 1135 1136 /* 1137 * skb is copied since mac80211 will later set 1138 * properties that might not be the same as the AP, 1139 * such as encryption, QoS, addresses, etc. 1140 * 1141 * No problem if skb_copy() fails, so no need to check. 1142 */ 1143 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC); 1144 sdata->u.mgd.orig_teardown_skb = skb; 1145 } 1146 spin_unlock_bh(&sdata->u.mgd.teardown_lock); 1147 } 1148 1149 /* disable bottom halves when entering the Tx path */ 1150 local_bh_disable(); 1151 __ieee80211_subif_start_xmit(skb, dev, flags, 1152 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 1153 local_bh_enable(); 1154 1155 return ret; 1156 1157 fail: 1158 dev_kfree_skb(skb); 1159 return ret; 1160 } 1161 1162 static int 1163 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, 1164 const u8 *peer, int link_id, 1165 u8 action_code, u8 dialog_token, 1166 u16 status_code, u32 peer_capability, bool initiator, 1167 const u8 *extra_ies, size_t extra_ies_len) 1168 { 1169 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1170 struct ieee80211_local *local = sdata->local; 1171 enum ieee80211_smps_mode smps_mode = 1172 sdata->deflink.u.mgd.driver_smps_mode; 1173 int ret; 1174 1175 /* don't support setup with forced SMPS mode that's not off */ 1176 if (smps_mode != IEEE80211_SMPS_AUTOMATIC && 1177 smps_mode != IEEE80211_SMPS_OFF) { 1178 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n", 1179 smps_mode); 1180 return -EOPNOTSUPP; 1181 } 1182 1183 lockdep_assert_wiphy(local->hw.wiphy); 1184 1185 /* we don't support concurrent TDLS peer setups */ 1186 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && 1187 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1188 ret = -EBUSY; 1189 goto out_unlock; 1190 } 1191 1192 /* 1193 * make sure we have a STA representing the peer so we drop or buffer 1194 * non-TDLS-setup frames to the peer. We can't send other packets 1195 * during setup through the AP path. 1196 * Allow error packets to be sent - sometimes we don't even add a STA 1197 * before failing the setup. 1198 */ 1199 if (status_code == 0) { 1200 rcu_read_lock(); 1201 if (!sta_info_get(sdata, peer)) { 1202 rcu_read_unlock(); 1203 ret = -ENOLINK; 1204 goto out_unlock; 1205 } 1206 rcu_read_unlock(); 1207 } 1208 1209 ieee80211_flush_queues(local, sdata, false); 1210 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); 1211 1212 /* we cannot take the mutex while preparing the setup packet */ 1213 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1214 link_id, action_code, 1215 dialog_token, status_code, 1216 peer_capability, initiator, 1217 extra_ies, extra_ies_len, 0, 1218 NULL); 1219 if (ret < 0) { 1220 eth_zero_addr(sdata->u.mgd.tdls_peer); 1221 return ret; 1222 } 1223 1224 wiphy_delayed_work_queue(sdata->local->hw.wiphy, 1225 &sdata->u.mgd.tdls_peer_del_work, 1226 TDLS_PEER_SETUP_TIMEOUT); 1227 return 0; 1228 1229 out_unlock: 1230 return ret; 1231 } 1232 1233 static int 1234 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, 1235 const u8 *peer, int link_id, 1236 u8 action_code, u8 dialog_token, 1237 u16 status_code, u32 peer_capability, 1238 bool initiator, const u8 *extra_ies, 1239 size_t extra_ies_len) 1240 { 1241 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1242 struct ieee80211_local *local = sdata->local; 1243 struct sta_info *sta; 1244 int ret; 1245 1246 /* 1247 * No packets can be transmitted to the peer via the AP during setup - 1248 * the STA is set as a TDLS peer, but is not authorized. 1249 * During teardown, we prevent direct transmissions by stopping the 1250 * queues and flushing all direct packets. 1251 */ 1252 ieee80211_stop_vif_queues(local, sdata, 1253 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1254 ieee80211_flush_queues(local, sdata, false); 1255 1256 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1257 link_id, action_code, 1258 dialog_token, status_code, 1259 peer_capability, initiator, 1260 extra_ies, extra_ies_len, 0, 1261 NULL); 1262 if (ret < 0) 1263 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", 1264 ret); 1265 1266 /* 1267 * Remove the STA AUTH flag to force further traffic through the AP. If 1268 * the STA was unreachable, it was already removed. 1269 */ 1270 rcu_read_lock(); 1271 sta = sta_info_get(sdata, peer); 1272 if (sta) 1273 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1274 rcu_read_unlock(); 1275 1276 ieee80211_wake_vif_queues(local, sdata, 1277 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); 1278 1279 return 0; 1280 } 1281 1282 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 1283 const u8 *peer, int link_id, 1284 u8 action_code, u8 dialog_token, u16 status_code, 1285 u32 peer_capability, bool initiator, 1286 const u8 *extra_ies, size_t extra_ies_len) 1287 { 1288 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1289 int ret; 1290 1291 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1292 return -EOPNOTSUPP; 1293 1294 /* make sure we are in managed mode, and associated */ 1295 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1296 !sdata->u.mgd.associated) 1297 return -EINVAL; 1298 1299 switch (action_code) { 1300 case WLAN_TDLS_SETUP_REQUEST: 1301 case WLAN_TDLS_SETUP_RESPONSE: 1302 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, 1303 link_id, action_code, 1304 dialog_token, status_code, 1305 peer_capability, initiator, 1306 extra_ies, extra_ies_len); 1307 break; 1308 case WLAN_TDLS_TEARDOWN: 1309 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, link_id, 1310 action_code, dialog_token, 1311 status_code, 1312 peer_capability, initiator, 1313 extra_ies, extra_ies_len); 1314 break; 1315 case WLAN_TDLS_DISCOVERY_REQUEST: 1316 /* 1317 * Protect the discovery so we can hear the TDLS discovery 1318 * response frame. It is transmitted directly and not buffered 1319 * by the AP. 1320 */ 1321 drv_mgd_protect_tdls_discover(sdata->local, sdata, link_id); 1322 fallthrough; 1323 case WLAN_TDLS_SETUP_CONFIRM: 1324 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: 1325 /* no special handling */ 1326 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, 1327 link_id, action_code, 1328 dialog_token, 1329 status_code, 1330 peer_capability, 1331 initiator, extra_ies, 1332 extra_ies_len, 0, NULL); 1333 break; 1334 default: 1335 ret = -EOPNOTSUPP; 1336 break; 1337 } 1338 1339 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM link_id %d status %d\n", 1340 action_code, peer, link_id, ret); 1341 return ret; 1342 } 1343 1344 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata, 1345 struct sta_info *sta) 1346 { 1347 struct ieee80211_local *local = sdata->local; 1348 struct ieee80211_chanctx_conf *conf; 1349 struct ieee80211_chanctx *ctx; 1350 enum nl80211_chan_width width; 1351 struct ieee80211_supported_band *sband; 1352 1353 lockdep_assert_wiphy(local->hw.wiphy); 1354 1355 conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf, 1356 lockdep_is_held(&local->hw.wiphy->mtx)); 1357 if (conf) { 1358 width = conf->def.width; 1359 sband = local->hw.wiphy->bands[conf->def.chan->band]; 1360 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1361 ieee80211_recalc_chanctx_chantype(local, ctx); 1362 1363 /* if width changed and a peer is given, update its BW */ 1364 if (width != conf->def.width && sta && 1365 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) { 1366 enum ieee80211_sta_rx_bandwidth bw; 1367 1368 bw = ieee80211_chan_width_to_rx_bw(conf->def.width); 1369 bw = min(bw, ieee80211_sta_cap_rx_bw(&sta->deflink)); 1370 if (bw != sta->sta.deflink.bandwidth) { 1371 sta->sta.deflink.bandwidth = bw; 1372 rate_control_rate_update(local, sband, sta, 0, 1373 IEEE80211_RC_BW_CHANGED); 1374 /* 1375 * if a TDLS peer BW was updated, we need to 1376 * recalc the chandef width again, to get the 1377 * correct chanctx min_def 1378 */ 1379 ieee80211_recalc_chanctx_chantype(local, ctx); 1380 } 1381 } 1382 1383 } 1384 } 1385 1386 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata) 1387 { 1388 struct sta_info *sta; 1389 bool result = false; 1390 1391 rcu_read_lock(); 1392 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 1393 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 1394 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 1395 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) || 1396 !sta->sta.deflink.ht_cap.ht_supported) 1397 continue; 1398 result = true; 1399 break; 1400 } 1401 rcu_read_unlock(); 1402 1403 return result; 1404 } 1405 1406 static void 1407 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata, 1408 struct sta_info *sta) 1409 { 1410 bool tdls_ht; 1411 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | 1412 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | 1413 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; 1414 u16 opmode; 1415 1416 /* Nothing to do if the BSS connection uses HT */ 1417 if (!(sdata->deflink.u.mgd.conn_flags & IEEE80211_CONN_DISABLE_HT)) 1418 return; 1419 1420 tdls_ht = (sta && sta->sta.deflink.ht_cap.ht_supported) || 1421 iee80211_tdls_have_ht_peers(sdata); 1422 1423 opmode = sdata->vif.bss_conf.ht_operation_mode; 1424 1425 if (tdls_ht) 1426 opmode |= protection; 1427 else 1428 opmode &= ~protection; 1429 1430 if (opmode == sdata->vif.bss_conf.ht_operation_mode) 1431 return; 1432 1433 sdata->vif.bss_conf.ht_operation_mode = opmode; 1434 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1435 BSS_CHANGED_HT); 1436 } 1437 1438 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 1439 const u8 *peer, enum nl80211_tdls_operation oper) 1440 { 1441 struct sta_info *sta; 1442 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1443 struct ieee80211_local *local = sdata->local; 1444 int ret; 1445 1446 lockdep_assert_wiphy(local->hw.wiphy); 1447 1448 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) 1449 return -EOPNOTSUPP; 1450 1451 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1452 return -EINVAL; 1453 1454 switch (oper) { 1455 case NL80211_TDLS_ENABLE_LINK: 1456 case NL80211_TDLS_DISABLE_LINK: 1457 break; 1458 case NL80211_TDLS_TEARDOWN: 1459 case NL80211_TDLS_SETUP: 1460 case NL80211_TDLS_DISCOVERY_REQ: 1461 /* We don't support in-driver setup/teardown/discovery */ 1462 return -EOPNOTSUPP; 1463 } 1464 1465 /* protect possible bss_conf changes and avoid concurrency in 1466 * ieee80211_bss_info_change_notify() 1467 */ 1468 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); 1469 1470 switch (oper) { 1471 case NL80211_TDLS_ENABLE_LINK: 1472 if (sdata->vif.bss_conf.csa_active) { 1473 tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); 1474 return -EBUSY; 1475 } 1476 1477 sta = sta_info_get(sdata, peer); 1478 if (!sta) 1479 return -ENOLINK; 1480 1481 iee80211_tdls_recalc_chanctx(sdata, sta); 1482 iee80211_tdls_recalc_ht_protection(sdata, sta); 1483 1484 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); 1485 1486 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || 1487 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); 1488 break; 1489 case NL80211_TDLS_DISABLE_LINK: 1490 /* 1491 * The teardown message in ieee80211_tdls_mgmt_teardown() was 1492 * created while the queues were stopped, so it might still be 1493 * pending. Before flushing the queues we need to be sure the 1494 * message is handled by the tasklet handling pending messages, 1495 * otherwise we might start destroying the station before 1496 * sending the teardown packet. 1497 * Note that this only forces the tasklet to flush pendings - 1498 * not to stop the tasklet from rescheduling itself. 1499 */ 1500 tasklet_kill(&local->tx_pending_tasklet); 1501 /* flush a potentially queued teardown packet */ 1502 ieee80211_flush_queues(local, sdata, false); 1503 1504 ret = sta_info_destroy_addr(sdata, peer); 1505 1506 iee80211_tdls_recalc_ht_protection(sdata, NULL); 1507 1508 iee80211_tdls_recalc_chanctx(sdata, NULL); 1509 if (ret) 1510 return ret; 1511 break; 1512 default: 1513 return -EOPNOTSUPP; 1514 } 1515 1516 if (ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { 1517 wiphy_delayed_work_cancel(sdata->local->hw.wiphy, 1518 &sdata->u.mgd.tdls_peer_del_work); 1519 eth_zero_addr(sdata->u.mgd.tdls_peer); 1520 } 1521 1522 wiphy_work_queue(sdata->local->hw.wiphy, 1523 &sdata->deflink.u.mgd.request_smps_work); 1524 1525 return 0; 1526 } 1527 1528 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, 1529 enum nl80211_tdls_operation oper, 1530 u16 reason_code, gfp_t gfp) 1531 { 1532 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1533 1534 if (vif->type != NL80211_IFTYPE_STATION || !vif->cfg.assoc) { 1535 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", 1536 oper); 1537 return; 1538 } 1539 1540 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); 1541 } 1542 EXPORT_SYMBOL(ieee80211_tdls_oper_request); 1543 1544 static void 1545 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) 1546 { 1547 struct ieee80211_ch_switch_timing *ch_sw; 1548 1549 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; 1550 *buf++ = sizeof(struct ieee80211_ch_switch_timing); 1551 1552 ch_sw = (void *)buf; 1553 ch_sw->switch_time = cpu_to_le16(switch_time); 1554 ch_sw->switch_timeout = cpu_to_le16(switch_timeout); 1555 } 1556 1557 /* find switch timing IE in SKB ready for Tx */ 1558 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) 1559 { 1560 struct ieee80211_tdls_data *tf; 1561 const u8 *ie_start; 1562 1563 /* 1564 * Get the offset for the new location of the switch timing IE. 1565 * The SKB network header will now point to the "payload_type" 1566 * element of the TDLS data frame struct. 1567 */ 1568 tf = container_of(skb->data + skb_network_offset(skb), 1569 struct ieee80211_tdls_data, payload_type); 1570 ie_start = tf->u.chan_switch_req.variable; 1571 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, 1572 skb->len - (ie_start - skb->data)); 1573 } 1574 1575 static struct sk_buff * 1576 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, 1577 struct cfg80211_chan_def *chandef, 1578 u32 *ch_sw_tm_ie_offset) 1579 { 1580 struct ieee80211_sub_if_data *sdata = sta->sdata; 1581 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 1582 2 + sizeof(struct ieee80211_ch_switch_timing)]; 1583 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); 1584 u8 *pos = extra_ies; 1585 struct sk_buff *skb; 1586 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0; 1587 1588 /* 1589 * if chandef points to a wide channel add a Secondary-Channel 1590 * Offset information element 1591 */ 1592 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1593 struct ieee80211_sec_chan_offs_ie *sec_chan_ie; 1594 bool ht40plus; 1595 1596 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 1597 *pos++ = sizeof(*sec_chan_ie); 1598 sec_chan_ie = (void *)pos; 1599 1600 ht40plus = cfg80211_get_chandef_type(chandef) == 1601 NL80211_CHAN_HT40PLUS; 1602 sec_chan_ie->sec_chan_offs = ht40plus ? 1603 IEEE80211_HT_PARAM_CHA_SEC_ABOVE : 1604 IEEE80211_HT_PARAM_CHA_SEC_BELOW; 1605 pos += sizeof(*sec_chan_ie); 1606 1607 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 1608 } 1609 1610 /* just set the values to 0, this is a template */ 1611 iee80211_tdls_add_ch_switch_timing(pos, 0, 0); 1612 1613 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1614 link_id, 1615 WLAN_TDLS_CHANNEL_SWITCH_REQUEST, 1616 0, 0, !sta->sta.tdls_initiator, 1617 extra_ies, extra_ies_len, 1618 oper_class, chandef); 1619 if (!skb) 1620 return NULL; 1621 1622 skb = ieee80211_build_data_template(sdata, skb, 0); 1623 if (IS_ERR(skb)) { 1624 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); 1625 return NULL; 1626 } 1627 1628 if (ch_sw_tm_ie_offset) { 1629 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1630 1631 if (!tm_ie) { 1632 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); 1633 dev_kfree_skb_any(skb); 1634 return NULL; 1635 } 1636 1637 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1638 } 1639 1640 tdls_dbg(sdata, 1641 "TDLS channel switch request template for %pM ch %d width %d\n", 1642 sta->sta.addr, chandef->chan->center_freq, chandef->width); 1643 return skb; 1644 } 1645 1646 int 1647 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, 1648 const u8 *addr, u8 oper_class, 1649 struct cfg80211_chan_def *chandef) 1650 { 1651 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1652 struct ieee80211_local *local = sdata->local; 1653 struct sta_info *sta; 1654 struct sk_buff *skb = NULL; 1655 u32 ch_sw_tm_ie; 1656 int ret; 1657 1658 lockdep_assert_wiphy(local->hw.wiphy); 1659 1660 if (chandef->chan->freq_offset) 1661 /* this may work, but is untested */ 1662 return -EOPNOTSUPP; 1663 1664 sta = sta_info_get(sdata, addr); 1665 if (!sta) { 1666 tdls_dbg(sdata, 1667 "Invalid TDLS peer %pM for channel switch request\n", 1668 addr); 1669 ret = -ENOENT; 1670 goto out; 1671 } 1672 1673 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { 1674 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", 1675 addr); 1676 ret = -EOPNOTSUPP; 1677 goto out; 1678 } 1679 1680 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, 1681 &ch_sw_tm_ie); 1682 if (!skb) { 1683 ret = -ENOENT; 1684 goto out; 1685 } 1686 1687 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, 1688 chandef, skb, ch_sw_tm_ie); 1689 if (!ret) 1690 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1691 1692 out: 1693 dev_kfree_skb_any(skb); 1694 return ret; 1695 } 1696 1697 void 1698 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, 1699 struct net_device *dev, 1700 const u8 *addr) 1701 { 1702 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1703 struct ieee80211_local *local = sdata->local; 1704 struct sta_info *sta; 1705 1706 lockdep_assert_wiphy(local->hw.wiphy); 1707 1708 sta = sta_info_get(sdata, addr); 1709 if (!sta) { 1710 tdls_dbg(sdata, 1711 "Invalid TDLS peer %pM for channel switch cancel\n", 1712 addr); 1713 return; 1714 } 1715 1716 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 1717 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", 1718 addr); 1719 return; 1720 } 1721 1722 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 1723 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 1724 } 1725 1726 static struct sk_buff * 1727 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, 1728 u32 *ch_sw_tm_ie_offset) 1729 { 1730 struct ieee80211_sub_if_data *sdata = sta->sdata; 1731 struct sk_buff *skb; 1732 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; 1733 int link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0; 1734 1735 /* initial timing are always zero in the template */ 1736 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); 1737 1738 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, 1739 link_id, 1740 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, 1741 0, 0, !sta->sta.tdls_initiator, 1742 extra_ies, sizeof(extra_ies), 0, NULL); 1743 if (!skb) 1744 return NULL; 1745 1746 skb = ieee80211_build_data_template(sdata, skb, 0); 1747 if (IS_ERR(skb)) { 1748 tdls_dbg(sdata, 1749 "Failed building TDLS channel switch resp frame\n"); 1750 return NULL; 1751 } 1752 1753 if (ch_sw_tm_ie_offset) { 1754 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); 1755 1756 if (!tm_ie) { 1757 tdls_dbg(sdata, 1758 "No switch timing IE in TDLS switch resp\n"); 1759 dev_kfree_skb_any(skb); 1760 return NULL; 1761 } 1762 1763 *ch_sw_tm_ie_offset = tm_ie - skb->data; 1764 } 1765 1766 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", 1767 sta->sta.addr); 1768 return skb; 1769 } 1770 1771 static int 1772 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, 1773 struct sk_buff *skb) 1774 { 1775 struct ieee80211_local *local = sdata->local; 1776 struct ieee802_11_elems *elems = NULL; 1777 struct sta_info *sta; 1778 struct ieee80211_tdls_data *tf = (void *)skb->data; 1779 bool local_initiator; 1780 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1781 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); 1782 struct ieee80211_tdls_ch_sw_params params = {}; 1783 int ret; 1784 1785 lockdep_assert_wiphy(local->hw.wiphy); 1786 1787 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; 1788 params.timestamp = rx_status->device_timestamp; 1789 1790 if (skb->len < baselen) { 1791 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", 1792 skb->len); 1793 return -EINVAL; 1794 } 1795 1796 sta = sta_info_get(sdata, tf->sa); 1797 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1798 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1799 tf->sa); 1800 ret = -EINVAL; 1801 goto out; 1802 } 1803 1804 params.sta = &sta->sta; 1805 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); 1806 if (params.status != 0) { 1807 ret = 0; 1808 goto call_drv; 1809 } 1810 1811 elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, 1812 skb->len - baselen, false, NULL); 1813 if (!elems) { 1814 ret = -ENOMEM; 1815 goto out; 1816 } 1817 1818 if (elems->parse_error) { 1819 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); 1820 ret = -EINVAL; 1821 goto out; 1822 } 1823 1824 if (!elems->ch_sw_timing || !elems->lnk_id) { 1825 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); 1826 ret = -EINVAL; 1827 goto out; 1828 } 1829 1830 /* validate the initiator is set correctly */ 1831 local_initiator = 1832 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1833 if (local_initiator == sta->sta.tdls_initiator) { 1834 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1835 ret = -EINVAL; 1836 goto out; 1837 } 1838 1839 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 1840 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 1841 1842 params.tmpl_skb = 1843 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); 1844 if (!params.tmpl_skb) { 1845 ret = -ENOENT; 1846 goto out; 1847 } 1848 1849 ret = 0; 1850 call_drv: 1851 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 1852 1853 tdls_dbg(sdata, 1854 "TDLS channel switch response received from %pM status %d\n", 1855 tf->sa, params.status); 1856 1857 out: 1858 dev_kfree_skb_any(params.tmpl_skb); 1859 kfree(elems); 1860 return ret; 1861 } 1862 1863 static int 1864 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, 1865 struct sk_buff *skb) 1866 { 1867 struct ieee80211_local *local = sdata->local; 1868 struct ieee802_11_elems *elems; 1869 struct cfg80211_chan_def chandef; 1870 struct ieee80211_channel *chan; 1871 enum nl80211_channel_type chan_type; 1872 int freq; 1873 u8 target_channel, oper_class; 1874 bool local_initiator; 1875 struct sta_info *sta; 1876 enum nl80211_band band; 1877 struct ieee80211_tdls_data *tf = (void *)skb->data; 1878 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 1879 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); 1880 struct ieee80211_tdls_ch_sw_params params = {}; 1881 int ret = 0; 1882 1883 lockdep_assert_wiphy(local->hw.wiphy); 1884 1885 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; 1886 params.timestamp = rx_status->device_timestamp; 1887 1888 if (skb->len < baselen) { 1889 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", 1890 skb->len); 1891 return -EINVAL; 1892 } 1893 1894 target_channel = tf->u.chan_switch_req.target_channel; 1895 oper_class = tf->u.chan_switch_req.oper_class; 1896 1897 /* 1898 * We can't easily infer the channel band. The operating class is 1899 * ambiguous - there are multiple tables (US/Europe/JP/Global). The 1900 * solution here is to treat channels with number >14 as 5GHz ones, 1901 * and specifically check for the (oper_class, channel) combinations 1902 * where this doesn't hold. These are thankfully unique according to 1903 * IEEE802.11-2012. 1904 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as 1905 * valid here. 1906 */ 1907 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || 1908 oper_class == 4 || oper_class == 5 || oper_class == 6) && 1909 target_channel < 14) 1910 band = NL80211_BAND_5GHZ; 1911 else 1912 band = target_channel < 14 ? NL80211_BAND_2GHZ : 1913 NL80211_BAND_5GHZ; 1914 1915 freq = ieee80211_channel_to_frequency(target_channel, band); 1916 if (freq == 0) { 1917 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", 1918 target_channel); 1919 return -EINVAL; 1920 } 1921 1922 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 1923 if (!chan) { 1924 tdls_dbg(sdata, 1925 "Unsupported channel for TDLS chan switch: %d\n", 1926 target_channel); 1927 return -EINVAL; 1928 } 1929 1930 elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable, 1931 skb->len - baselen, false, NULL); 1932 if (!elems) 1933 return -ENOMEM; 1934 1935 if (elems->parse_error) { 1936 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); 1937 ret = -EINVAL; 1938 goto free; 1939 } 1940 1941 if (!elems->ch_sw_timing || !elems->lnk_id) { 1942 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); 1943 ret = -EINVAL; 1944 goto free; 1945 } 1946 1947 if (!elems->sec_chan_offs) { 1948 chan_type = NL80211_CHAN_HT20; 1949 } else { 1950 switch (elems->sec_chan_offs->sec_chan_offs) { 1951 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 1952 chan_type = NL80211_CHAN_HT40PLUS; 1953 break; 1954 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 1955 chan_type = NL80211_CHAN_HT40MINUS; 1956 break; 1957 default: 1958 chan_type = NL80211_CHAN_HT20; 1959 break; 1960 } 1961 } 1962 1963 cfg80211_chandef_create(&chandef, chan, chan_type); 1964 1965 /* we will be active on the TDLS link */ 1966 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, 1967 sdata->wdev.iftype)) { 1968 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); 1969 ret = -EINVAL; 1970 goto free; 1971 } 1972 1973 sta = sta_info_get(sdata, tf->sa); 1974 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { 1975 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", 1976 tf->sa); 1977 ret = -EINVAL; 1978 goto out; 1979 } 1980 1981 params.sta = &sta->sta; 1982 1983 /* validate the initiator is set correctly */ 1984 local_initiator = 1985 !memcmp(elems->lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); 1986 if (local_initiator == sta->sta.tdls_initiator) { 1987 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); 1988 ret = -EINVAL; 1989 goto out; 1990 } 1991 1992 /* peer should have known better */ 1993 if (!sta->sta.deflink.ht_cap.ht_supported && elems->sec_chan_offs && 1994 elems->sec_chan_offs->sec_chan_offs) { 1995 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); 1996 ret = -EOPNOTSUPP; 1997 goto out; 1998 } 1999 2000 params.chandef = &chandef; 2001 params.switch_time = le16_to_cpu(elems->ch_sw_timing->switch_time); 2002 params.switch_timeout = le16_to_cpu(elems->ch_sw_timing->switch_timeout); 2003 2004 params.tmpl_skb = 2005 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, 2006 ¶ms.ch_sw_tm_ie); 2007 if (!params.tmpl_skb) { 2008 ret = -ENOENT; 2009 goto out; 2010 } 2011 2012 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); 2013 2014 tdls_dbg(sdata, 2015 "TDLS ch switch request received from %pM ch %d width %d\n", 2016 tf->sa, params.chandef->chan->center_freq, 2017 params.chandef->width); 2018 out: 2019 dev_kfree_skb_any(params.tmpl_skb); 2020 free: 2021 kfree(elems); 2022 return ret; 2023 } 2024 2025 void 2026 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, 2027 struct sk_buff *skb) 2028 { 2029 struct ieee80211_tdls_data *tf = (void *)skb->data; 2030 struct wiphy *wiphy = sdata->local->hw.wiphy; 2031 2032 lockdep_assert_wiphy(wiphy); 2033 2034 /* make sure the driver supports it */ 2035 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) 2036 return; 2037 2038 /* we want to access the entire packet */ 2039 if (skb_linearize(skb)) 2040 return; 2041 /* 2042 * The packet/size was already validated by mac80211 Rx path, only look 2043 * at the action type. 2044 */ 2045 switch (tf->action_code) { 2046 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: 2047 ieee80211_process_tdls_channel_switch_req(sdata, skb); 2048 break; 2049 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: 2050 ieee80211_process_tdls_channel_switch_resp(sdata, skb); 2051 break; 2052 default: 2053 WARN_ON_ONCE(1); 2054 return; 2055 } 2056 } 2057 2058 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata) 2059 { 2060 struct sta_info *sta; 2061 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 2062 2063 rcu_read_lock(); 2064 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 2065 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || 2066 !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2067 continue; 2068 2069 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, 2070 NL80211_TDLS_TEARDOWN, reason, 2071 GFP_ATOMIC); 2072 } 2073 rcu_read_unlock(); 2074 } 2075 2076 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata, 2077 const u8 *peer, u16 reason) 2078 { 2079 struct ieee80211_sta *sta; 2080 2081 rcu_read_lock(); 2082 sta = ieee80211_find_sta(&sdata->vif, peer); 2083 if (!sta || !sta->tdls) { 2084 rcu_read_unlock(); 2085 return; 2086 } 2087 rcu_read_unlock(); 2088 2089 tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n", 2090 peer, reason, 2091 ieee80211_get_reason_code_string(reason)); 2092 2093 ieee80211_tdls_oper_request(&sdata->vif, peer, 2094 NL80211_TDLS_TEARDOWN, 2095 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE, 2096 GFP_ATOMIC); 2097 } 2098