2 * mac80211 TDLS handling code
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
9 * This file is GPLv2 as found in COPYING.
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"
21 /* give usermode some time for retries in setting up the TDLS session */
22 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
24 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
26 struct ieee80211_sub_if_data *sdata;
27 struct ieee80211_local *local;
29 sdata = container_of(wk, struct ieee80211_sub_if_data,
30 u.mgd.tdls_peer_del_work.work);
33 mutex_lock(&local->mtx);
34 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
35 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
36 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
37 eth_zero_addr(sdata->u.mgd.tdls_peer);
39 mutex_unlock(&local->mtx);
42 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
45 struct ieee80211_local *local = sdata->local;
46 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
47 bool chan_switch = local->hw.wiphy->features &
48 NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
49 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
50 !ifmgd->tdls_wider_bw_prohibited;
51 struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
52 bool vht = sband && sband->vht_cap.vht_supported;
53 u8 *pos = (void *)skb_put(skb, 10);
55 *pos++ = WLAN_EID_EXT_CAPABILITY;
60 *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
61 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
64 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
68 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
69 struct sk_buff *skb, u16 start, u16 end,
72 u8 subband_cnt = 0, ch_cnt = 0;
73 struct ieee80211_channel *ch;
74 struct cfg80211_chan_def chandef;
76 struct wiphy *wiphy = sdata->local->hw.wiphy;
78 for (i = start; i <= end; i += spacing) {
82 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
84 /* we will be active on the channel */
85 cfg80211_chandef_create(&chandef, ch,
87 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
88 sdata->wdev.iftype)) {
91 * check if the next channel is also part of
99 * we've reached the end of a range, with allowed channels
103 u8 *pos = skb_put(skb, 2);
104 *pos++ = ieee80211_frequency_to_channel(subband_start);
112 /* all channels in the requested range are allowed - add them here */
114 u8 *pos = skb_put(skb, 2);
115 *pos++ = ieee80211_frequency_to_channel(subband_start);
125 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
129 * Add possible channels for TDLS. These are channels that are allowed
133 u8 *pos = skb_put(skb, 2);
135 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
138 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
139 * this doesn't happen in real world scenarios.
142 /* 2GHz, with 5MHz spacing */
143 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
145 /* 5GHz, with 20MHz spacing */
146 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
149 *pos = 2 * subband_cnt;
152 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
158 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
162 pos = skb_put(skb, 4);
163 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
164 *pos++ = 2; /* len */
167 *pos++ = op_class; /* give current operating class as alternate too */
170 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
172 u8 *pos = (void *)skb_put(skb, 3);
174 *pos++ = WLAN_EID_BSS_COEX_2040;
175 *pos++ = 1; /* len */
177 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
180 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
183 struct ieee80211_supported_band *sband;
185 /* The capability will be 0 when sending a failure code */
186 if (status_code != 0)
189 sband = ieee80211_get_sband(sdata);
190 if (sband && sband->band == NL80211_BAND_2GHZ) {
191 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
192 WLAN_CAPABILITY_SHORT_PREAMBLE;
198 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
199 struct sk_buff *skb, const u8 *peer,
202 struct ieee80211_tdls_lnkie *lnkid;
203 const u8 *init_addr, *rsp_addr;
206 init_addr = sdata->vif.addr;
210 rsp_addr = sdata->vif.addr;
213 lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
215 lnkid->ie_type = WLAN_EID_LINK_ID;
216 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
218 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
219 memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
220 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
224 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
226 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
227 u8 *pos = (void *)skb_put(skb, 4);
229 *pos++ = WLAN_EID_AID;
230 *pos++ = 2; /* len */
231 put_unaligned_le16(ifmgd->aid, pos);
234 /* translate numbering in the WMM parameter IE to the mac80211 notation */
235 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
241 return IEEE80211_AC_BE;
243 return IEEE80211_AC_BK;
245 return IEEE80211_AC_VI;
247 return IEEE80211_AC_VO;
251 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
258 ret |= (aci << 5) & 0x60;
262 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
264 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
265 ((ilog2(cw_max + 1) << 0x4) & 0xf0);
268 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
271 struct ieee80211_wmm_param_ie *wmm;
272 struct ieee80211_tx_queue_params *txq;
275 wmm = (void *)skb_put(skb, sizeof(*wmm));
276 memset(wmm, 0, sizeof(*wmm));
278 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
279 wmm->len = sizeof(*wmm) - 2;
281 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
284 wmm->oui_type = 2; /* WME */
285 wmm->oui_subtype = 1; /* WME param */
286 wmm->version = 1; /* WME ver */
287 wmm->qos_info = 0; /* U-APSD not in use */
290 * Use the EDCA parameters defined for the BSS, or default if the AP
291 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
293 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
294 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
295 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
297 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
298 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
303 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
304 struct sta_info *sta)
306 /* IEEE802.11ac-2013 Table E-4 */
307 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
308 struct cfg80211_chan_def uc = sta->tdls_chandef;
309 enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
312 /* only support upgrading non-narrow channels up to 80Mhz */
313 if (max_width == NL80211_CHAN_WIDTH_5 ||
314 max_width == NL80211_CHAN_WIDTH_10)
317 if (max_width > NL80211_CHAN_WIDTH_80)
318 max_width = NL80211_CHAN_WIDTH_80;
320 if (uc.width >= max_width)
323 * Channel usage constrains in the IEEE802.11ac-2013 specification only
324 * allow expanding a 20MHz channel to 80MHz in a single way. In
325 * addition, there are no 40MHz allowed channels that are not part of
326 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
328 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
329 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
330 uc.center_freq1 = centers_80mhz[i];
332 uc.width = NL80211_CHAN_WIDTH_80;
336 if (!uc.center_freq1)
339 /* proceed to downgrade the chandef until usable or the same as AP BW */
340 while (uc.width > max_width ||
341 (uc.width > sta->tdls_chandef.width &&
342 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
343 sdata->wdev.iftype)))
344 ieee80211_chandef_downgrade(&uc);
346 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
347 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
348 sta->tdls_chandef.width, uc.width);
351 * the station is not yet authorized when BW upgrade is done,
352 * locking is not required
354 sta->tdls_chandef = uc;
359 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
360 struct sk_buff *skb, const u8 *peer,
361 u8 action_code, bool initiator,
362 const u8 *extra_ies, size_t extra_ies_len)
364 struct ieee80211_supported_band *sband;
365 struct ieee80211_local *local = sdata->local;
366 struct ieee80211_sta_ht_cap ht_cap;
367 struct ieee80211_sta_vht_cap vht_cap;
368 struct sta_info *sta = NULL;
369 size_t offset = 0, noffset;
372 sband = ieee80211_get_sband(sdata);
376 ieee80211_add_srates_ie(sdata, skb, false, sband->band);
377 ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band);
378 ieee80211_tdls_add_supp_channels(sdata, skb);
380 /* add any custom IEs that go before Extended Capabilities */
382 static const u8 before_ext_cap[] = {
385 WLAN_EID_EXT_SUPP_RATES,
386 WLAN_EID_SUPPORTED_CHANNELS,
389 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
391 ARRAY_SIZE(before_ext_cap),
393 pos = skb_put(skb, noffset - offset);
394 memcpy(pos, extra_ies + offset, noffset - offset);
398 ieee80211_tdls_add_ext_capab(sdata, skb);
400 /* add the QoS element if we support it */
401 if (local->hw.queues >= IEEE80211_NUM_ACS &&
402 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
403 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
405 /* add any custom IEs that go before HT capabilities */
407 static const u8 before_ht_cap[] = {
410 WLAN_EID_EXT_SUPP_RATES,
411 WLAN_EID_SUPPORTED_CHANNELS,
413 WLAN_EID_EXT_CAPABILITY,
415 WLAN_EID_FAST_BSS_TRANSITION,
416 WLAN_EID_TIMEOUT_INTERVAL,
417 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
419 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
421 ARRAY_SIZE(before_ht_cap),
423 pos = skb_put(skb, noffset - offset);
424 memcpy(pos, extra_ies + offset, noffset - offset);
428 mutex_lock(&local->sta_mtx);
430 /* we should have the peer STA if we're already responding */
431 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
432 sta = sta_info_get(sdata, peer);
433 if (WARN_ON_ONCE(!sta)) {
434 mutex_unlock(&local->sta_mtx);
438 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
441 ieee80211_tdls_add_oper_classes(sdata, skb);
444 * with TDLS we can switch channels, and HT-caps are not necessarily
445 * the same on all bands. The specification limits the setup to a
446 * single HT-cap, so use the current band for now.
448 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
450 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
451 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
452 ht_cap.ht_supported) {
453 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
455 /* disable SMPS in TDLS initiator */
456 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
457 << IEEE80211_HT_CAP_SM_PS_SHIFT;
459 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
460 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
461 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
462 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
463 /* the peer caps are already intersected with our own */
464 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
466 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
467 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
470 if (ht_cap.ht_supported &&
471 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
472 ieee80211_tdls_add_bss_coex_ie(skb);
474 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
476 /* add any custom IEs that go before VHT capabilities */
478 static const u8 before_vht_cap[] = {
481 WLAN_EID_EXT_SUPP_RATES,
482 WLAN_EID_SUPPORTED_CHANNELS,
484 WLAN_EID_EXT_CAPABILITY,
486 WLAN_EID_FAST_BSS_TRANSITION,
487 WLAN_EID_TIMEOUT_INTERVAL,
488 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
491 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
493 ARRAY_SIZE(before_vht_cap),
495 pos = skb_put(skb, noffset - offset);
496 memcpy(pos, extra_ies + offset, noffset - offset);
500 /* build the VHT-cap similarly to the HT-cap */
501 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
502 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
503 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
504 vht_cap.vht_supported) {
505 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
507 /* the AID is present only when VHT is implemented */
508 if (action_code == WLAN_TDLS_SETUP_REQUEST)
509 ieee80211_tdls_add_aid(sdata, skb);
511 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
512 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
513 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
514 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
515 /* the peer caps are already intersected with our own */
516 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
518 /* the AID is present only when VHT is implemented */
519 ieee80211_tdls_add_aid(sdata, skb);
521 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
522 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
525 * if both peers support WIDER_BW, we can expand the chandef to
526 * a wider compatible one, up to 80MHz
528 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
529 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
532 mutex_unlock(&local->sta_mtx);
534 /* add any remaining IEs */
536 noffset = extra_ies_len;
537 pos = skb_put(skb, noffset - offset);
538 memcpy(pos, extra_ies + offset, noffset - offset);
544 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
545 struct sk_buff *skb, const u8 *peer,
546 bool initiator, const u8 *extra_ies,
547 size_t extra_ies_len)
549 struct ieee80211_local *local = sdata->local;
550 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
551 size_t offset = 0, noffset;
552 struct sta_info *sta, *ap_sta;
553 struct ieee80211_supported_band *sband;
556 sband = ieee80211_get_sband(sdata);
560 mutex_lock(&local->sta_mtx);
562 sta = sta_info_get(sdata, peer);
563 ap_sta = sta_info_get(sdata, ifmgd->bssid);
564 if (WARN_ON_ONCE(!sta || !ap_sta)) {
565 mutex_unlock(&local->sta_mtx);
569 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
571 /* add any custom IEs that go before the QoS IE */
573 static const u8 before_qos[] = {
576 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
578 ARRAY_SIZE(before_qos),
580 pos = skb_put(skb, noffset - offset);
581 memcpy(pos, extra_ies + offset, noffset - offset);
585 /* add the QoS param IE if both the peer and we support it */
586 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
587 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
589 /* add any custom IEs that go before HT operation */
591 static const u8 before_ht_op[] = {
594 WLAN_EID_FAST_BSS_TRANSITION,
595 WLAN_EID_TIMEOUT_INTERVAL,
597 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
599 ARRAY_SIZE(before_ht_op),
601 pos = skb_put(skb, noffset - offset);
602 memcpy(pos, extra_ies + offset, noffset - offset);
607 * if HT support is only added in TDLS, we need an HT-operation IE.
608 * add the IE as required by IEEE802.11-2012 9.23.3.2.
610 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
611 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
612 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
613 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
615 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
616 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
617 &sdata->vif.bss_conf.chandef, prot,
621 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
623 /* only include VHT-operation if not on the 2.4GHz band */
624 if (sband->band != NL80211_BAND_2GHZ &&
625 sta->sta.vht_cap.vht_supported) {
627 * if both peers support WIDER_BW, we can expand the chandef to
628 * a wider compatible one, up to 80MHz
630 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
631 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
633 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
634 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
638 mutex_unlock(&local->sta_mtx);
640 /* add any remaining IEs */
642 noffset = extra_ies_len;
643 pos = skb_put(skb, noffset - offset);
644 memcpy(pos, extra_ies + offset, noffset - offset);
649 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
650 struct sk_buff *skb, const u8 *peer,
651 bool initiator, const u8 *extra_ies,
652 size_t extra_ies_len, u8 oper_class,
653 struct cfg80211_chan_def *chandef)
655 struct ieee80211_tdls_data *tf;
656 size_t offset = 0, noffset;
659 if (WARN_ON_ONCE(!chandef))
662 tf = (void *)skb->data;
663 tf->u.chan_switch_req.target_channel =
664 ieee80211_frequency_to_channel(chandef->chan->center_freq);
665 tf->u.chan_switch_req.oper_class = oper_class;
668 static const u8 before_lnkie[] = {
669 WLAN_EID_SECONDARY_CHANNEL_OFFSET,
671 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
673 ARRAY_SIZE(before_lnkie),
675 pos = skb_put(skb, noffset - offset);
676 memcpy(pos, extra_ies + offset, noffset - offset);
680 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
682 /* add any remaining IEs */
684 noffset = extra_ies_len;
685 pos = skb_put(skb, noffset - offset);
686 memcpy(pos, extra_ies + offset, noffset - offset);
691 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
692 struct sk_buff *skb, const u8 *peer,
693 u16 status_code, bool initiator,
695 size_t extra_ies_len)
697 if (status_code == 0)
698 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
701 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
704 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
705 struct sk_buff *skb, const u8 *peer,
706 u8 action_code, u16 status_code,
707 bool initiator, const u8 *extra_ies,
708 size_t extra_ies_len, u8 oper_class,
709 struct cfg80211_chan_def *chandef)
711 switch (action_code) {
712 case WLAN_TDLS_SETUP_REQUEST:
713 case WLAN_TDLS_SETUP_RESPONSE:
714 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
715 if (status_code == 0)
716 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
722 case WLAN_TDLS_SETUP_CONFIRM:
723 if (status_code == 0)
724 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
725 initiator, extra_ies,
728 case WLAN_TDLS_TEARDOWN:
729 case WLAN_TDLS_DISCOVERY_REQUEST:
731 memcpy(skb_put(skb, extra_ies_len), extra_ies,
733 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
734 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
736 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
737 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
738 initiator, extra_ies,
740 oper_class, chandef);
742 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
743 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
745 initiator, extra_ies,
753 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
754 const u8 *peer, u8 action_code, u8 dialog_token,
755 u16 status_code, struct sk_buff *skb)
757 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
758 struct ieee80211_tdls_data *tf;
760 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
762 memcpy(tf->da, peer, ETH_ALEN);
763 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
764 tf->ether_type = cpu_to_be16(ETH_P_TDLS);
765 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
767 /* network header is after the ethernet header */
768 skb_set_network_header(skb, ETH_HLEN);
770 switch (action_code) {
771 case WLAN_TDLS_SETUP_REQUEST:
772 tf->category = WLAN_CATEGORY_TDLS;
773 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
775 skb_put(skb, sizeof(tf->u.setup_req));
776 tf->u.setup_req.dialog_token = dialog_token;
777 tf->u.setup_req.capability =
778 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
781 case WLAN_TDLS_SETUP_RESPONSE:
782 tf->category = WLAN_CATEGORY_TDLS;
783 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
785 skb_put(skb, sizeof(tf->u.setup_resp));
786 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
787 tf->u.setup_resp.dialog_token = dialog_token;
788 tf->u.setup_resp.capability =
789 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
792 case WLAN_TDLS_SETUP_CONFIRM:
793 tf->category = WLAN_CATEGORY_TDLS;
794 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
796 skb_put(skb, sizeof(tf->u.setup_cfm));
797 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
798 tf->u.setup_cfm.dialog_token = dialog_token;
800 case WLAN_TDLS_TEARDOWN:
801 tf->category = WLAN_CATEGORY_TDLS;
802 tf->action_code = WLAN_TDLS_TEARDOWN;
804 skb_put(skb, sizeof(tf->u.teardown));
805 tf->u.teardown.reason_code = cpu_to_le16(status_code);
807 case WLAN_TDLS_DISCOVERY_REQUEST:
808 tf->category = WLAN_CATEGORY_TDLS;
809 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
811 skb_put(skb, sizeof(tf->u.discover_req));
812 tf->u.discover_req.dialog_token = dialog_token;
814 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
815 tf->category = WLAN_CATEGORY_TDLS;
816 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
818 skb_put(skb, sizeof(tf->u.chan_switch_req));
820 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
821 tf->category = WLAN_CATEGORY_TDLS;
822 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
824 skb_put(skb, sizeof(tf->u.chan_switch_resp));
825 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
835 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
836 const u8 *peer, u8 action_code, u8 dialog_token,
837 u16 status_code, struct sk_buff *skb)
839 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
840 struct ieee80211_mgmt *mgmt;
842 mgmt = (void *)skb_put(skb, 24);
844 memcpy(mgmt->da, peer, ETH_ALEN);
845 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
846 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
848 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
849 IEEE80211_STYPE_ACTION);
851 switch (action_code) {
852 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
853 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
854 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
855 mgmt->u.action.u.tdls_discover_resp.action_code =
856 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
857 mgmt->u.action.u.tdls_discover_resp.dialog_token =
859 mgmt->u.action.u.tdls_discover_resp.capability =
860 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
870 static struct sk_buff *
871 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
872 const u8 *peer, u8 action_code,
873 u8 dialog_token, u16 status_code,
874 bool initiator, const u8 *extra_ies,
875 size_t extra_ies_len, u8 oper_class,
876 struct cfg80211_chan_def *chandef)
878 struct ieee80211_local *local = sdata->local;
882 skb = netdev_alloc_skb(sdata->dev,
883 local->hw.extra_tx_headroom +
884 max(sizeof(struct ieee80211_mgmt),
885 sizeof(struct ieee80211_tdls_data)) +
886 50 + /* supported rates */
888 26 + /* max(WMM-info, WMM-param) */
889 2 + max(sizeof(struct ieee80211_ht_cap),
890 sizeof(struct ieee80211_ht_operation)) +
891 2 + max(sizeof(struct ieee80211_vht_cap),
892 sizeof(struct ieee80211_vht_operation)) +
893 50 + /* supported channels */
894 3 + /* 40/20 BSS coex */
896 4 + /* oper classes */
898 sizeof(struct ieee80211_tdls_lnkie));
902 skb_reserve(skb, local->hw.extra_tx_headroom);
904 switch (action_code) {
905 case WLAN_TDLS_SETUP_REQUEST:
906 case WLAN_TDLS_SETUP_RESPONSE:
907 case WLAN_TDLS_SETUP_CONFIRM:
908 case WLAN_TDLS_TEARDOWN:
909 case WLAN_TDLS_DISCOVERY_REQUEST:
910 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
911 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
912 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
914 action_code, dialog_token,
917 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
918 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
920 dialog_token, status_code,
931 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
932 initiator, extra_ies, extra_ies_len, oper_class,
942 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
943 const u8 *peer, u8 action_code, u8 dialog_token,
944 u16 status_code, u32 peer_capability,
945 bool initiator, const u8 *extra_ies,
946 size_t extra_ies_len, u8 oper_class,
947 struct cfg80211_chan_def *chandef)
949 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
950 struct sk_buff *skb = NULL;
951 struct sta_info *sta;
956 sta = sta_info_get(sdata, peer);
958 /* infer the initiator if we can, to support old userspace */
959 switch (action_code) {
960 case WLAN_TDLS_SETUP_REQUEST:
962 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
963 sta->sta.tdls_initiator = false;
966 case WLAN_TDLS_SETUP_CONFIRM:
967 case WLAN_TDLS_DISCOVERY_REQUEST:
970 case WLAN_TDLS_SETUP_RESPONSE:
972 * In some testing scenarios, we send a request and response.
973 * Make the last packet sent take effect for the initiator
977 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
978 sta->sta.tdls_initiator = true;
981 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
984 case WLAN_TDLS_TEARDOWN:
985 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
986 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
987 /* any value is ok */
994 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
1001 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
1002 dialog_token, status_code,
1003 initiator, extra_ies,
1004 extra_ies_len, oper_class,
1011 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
1012 ieee80211_tx_skb(sdata, skb);
1017 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1018 * we should default to AC_VI.
1020 switch (action_code) {
1021 case WLAN_TDLS_SETUP_REQUEST:
1022 case WLAN_TDLS_SETUP_RESPONSE:
1023 skb->priority = 256 + 2;
1026 skb->priority = 256 + 5;
1029 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb));
1032 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1033 * Later, if no ACK is returned from peer, we will re-send the teardown
1034 * packet through the AP.
1036 if ((action_code == WLAN_TDLS_TEARDOWN) &&
1037 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1038 bool try_resend; /* Should we keep skb for possible resend */
1040 /* If not sending directly to peer - no point in keeping skb */
1042 sta = sta_info_get(sdata, peer);
1043 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1046 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1047 if (try_resend && !sdata->u.mgd.teardown_skb) {
1048 /* Mark it as requiring TX status callback */
1049 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1050 IEEE80211_TX_INTFL_MLME_CONN_TX;
1053 * skb is copied since mac80211 will later set
1054 * properties that might not be the same as the AP,
1055 * such as encryption, QoS, addresses, etc.
1057 * No problem if skb_copy() fails, so no need to check.
1059 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1060 sdata->u.mgd.orig_teardown_skb = skb;
1062 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1065 /* disable bottom halves when entering the Tx path */
1067 __ieee80211_subif_start_xmit(skb, dev, flags);
1078 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1079 const u8 *peer, u8 action_code, u8 dialog_token,
1080 u16 status_code, u32 peer_capability, bool initiator,
1081 const u8 *extra_ies, size_t extra_ies_len)
1083 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1084 struct ieee80211_local *local = sdata->local;
1085 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1088 /* don't support setup with forced SMPS mode that's not off */
1089 if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1090 smps_mode != IEEE80211_SMPS_OFF) {
1091 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1096 mutex_lock(&local->mtx);
1098 /* we don't support concurrent TDLS peer setups */
1099 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1100 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1106 * make sure we have a STA representing the peer so we drop or buffer
1107 * non-TDLS-setup frames to the peer. We can't send other packets
1108 * during setup through the AP path.
1109 * Allow error packets to be sent - sometimes we don't even add a STA
1110 * before failing the setup.
1112 if (status_code == 0) {
1114 if (!sta_info_get(sdata, peer)) {
1122 ieee80211_flush_queues(local, sdata, false);
1123 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1124 mutex_unlock(&local->mtx);
1126 /* we cannot take the mutex while preparing the setup packet */
1127 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1128 dialog_token, status_code,
1129 peer_capability, initiator,
1130 extra_ies, extra_ies_len, 0,
1133 mutex_lock(&local->mtx);
1134 eth_zero_addr(sdata->u.mgd.tdls_peer);
1135 mutex_unlock(&local->mtx);
1139 ieee80211_queue_delayed_work(&sdata->local->hw,
1140 &sdata->u.mgd.tdls_peer_del_work,
1141 TDLS_PEER_SETUP_TIMEOUT);
1145 mutex_unlock(&local->mtx);
1150 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1151 const u8 *peer, u8 action_code, u8 dialog_token,
1152 u16 status_code, u32 peer_capability,
1153 bool initiator, const u8 *extra_ies,
1154 size_t extra_ies_len)
1156 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1157 struct ieee80211_local *local = sdata->local;
1158 struct sta_info *sta;
1162 * No packets can be transmitted to the peer via the AP during setup -
1163 * the STA is set as a TDLS peer, but is not authorized.
1164 * During teardown, we prevent direct transmissions by stopping the
1165 * queues and flushing all direct packets.
1167 ieee80211_stop_vif_queues(local, sdata,
1168 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1169 ieee80211_flush_queues(local, sdata, false);
1171 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1172 dialog_token, status_code,
1173 peer_capability, initiator,
1174 extra_ies, extra_ies_len, 0,
1177 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1181 * Remove the STA AUTH flag to force further traffic through the AP. If
1182 * the STA was unreachable, it was already removed.
1185 sta = sta_info_get(sdata, peer);
1187 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1190 ieee80211_wake_vif_queues(local, sdata,
1191 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1196 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1197 const u8 *peer, u8 action_code, u8 dialog_token,
1198 u16 status_code, u32 peer_capability,
1199 bool initiator, const u8 *extra_ies,
1200 size_t extra_ies_len)
1202 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1205 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1208 /* make sure we are in managed mode, and associated */
1209 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1210 !sdata->u.mgd.associated)
1213 switch (action_code) {
1214 case WLAN_TDLS_SETUP_REQUEST:
1215 case WLAN_TDLS_SETUP_RESPONSE:
1216 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1217 dialog_token, status_code,
1218 peer_capability, initiator,
1219 extra_ies, extra_ies_len);
1221 case WLAN_TDLS_TEARDOWN:
1222 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1223 action_code, dialog_token,
1225 peer_capability, initiator,
1226 extra_ies, extra_ies_len);
1228 case WLAN_TDLS_DISCOVERY_REQUEST:
1230 * Protect the discovery so we can hear the TDLS discovery
1231 * response frame. It is transmitted directly and not buffered
1234 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1236 case WLAN_TDLS_SETUP_CONFIRM:
1237 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1238 /* no special handling */
1239 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1244 initiator, extra_ies,
1245 extra_ies_len, 0, NULL);
1252 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1253 action_code, peer, ret);
1257 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1258 struct sta_info *sta)
1260 struct ieee80211_local *local = sdata->local;
1261 struct ieee80211_chanctx_conf *conf;
1262 struct ieee80211_chanctx *ctx;
1263 enum nl80211_chan_width width;
1264 struct ieee80211_supported_band *sband;
1266 mutex_lock(&local->chanctx_mtx);
1267 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1268 lockdep_is_held(&local->chanctx_mtx));
1270 width = conf->def.width;
1271 sband = local->hw.wiphy->bands[conf->def.chan->band];
1272 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1273 ieee80211_recalc_chanctx_chantype(local, ctx);
1275 /* if width changed and a peer is given, update its BW */
1276 if (width != conf->def.width && sta &&
1277 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1278 enum ieee80211_sta_rx_bandwidth bw;
1280 bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1281 bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1282 if (bw != sta->sta.bandwidth) {
1283 sta->sta.bandwidth = bw;
1284 rate_control_rate_update(local, sband, sta,
1285 IEEE80211_RC_BW_CHANGED);
1287 * if a TDLS peer BW was updated, we need to
1288 * recalc the chandef width again, to get the
1289 * correct chanctx min_def
1291 ieee80211_recalc_chanctx_chantype(local, ctx);
1296 mutex_unlock(&local->chanctx_mtx);
1299 static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1301 struct sta_info *sta;
1302 bool result = false;
1305 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1306 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1307 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1308 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1309 !sta->sta.ht_cap.ht_supported)
1320 iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1321 struct sta_info *sta)
1323 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1325 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1326 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1327 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1330 /* Nothing to do if the BSS connection uses HT */
1331 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1334 tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1335 iee80211_tdls_have_ht_peers(sdata);
1337 opmode = sdata->vif.bss_conf.ht_operation_mode;
1340 opmode |= protection;
1342 opmode &= ~protection;
1344 if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1347 sdata->vif.bss_conf.ht_operation_mode = opmode;
1348 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1351 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1352 const u8 *peer, enum nl80211_tdls_operation oper)
1354 struct sta_info *sta;
1355 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1356 struct ieee80211_local *local = sdata->local;
1359 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1362 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1366 case NL80211_TDLS_ENABLE_LINK:
1367 case NL80211_TDLS_DISABLE_LINK:
1369 case NL80211_TDLS_TEARDOWN:
1370 case NL80211_TDLS_SETUP:
1371 case NL80211_TDLS_DISCOVERY_REQ:
1372 /* We don't support in-driver setup/teardown/discovery */
1376 /* protect possible bss_conf changes and avoid concurrency in
1377 * ieee80211_bss_info_change_notify()
1380 mutex_lock(&local->mtx);
1381 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1384 case NL80211_TDLS_ENABLE_LINK:
1385 if (sdata->vif.csa_active) {
1386 tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1391 mutex_lock(&local->sta_mtx);
1392 sta = sta_info_get(sdata, peer);
1394 mutex_unlock(&local->sta_mtx);
1399 iee80211_tdls_recalc_chanctx(sdata, sta);
1400 iee80211_tdls_recalc_ht_protection(sdata, sta);
1402 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1403 mutex_unlock(&local->sta_mtx);
1405 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1406 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1409 case NL80211_TDLS_DISABLE_LINK:
1411 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1412 * created while the queues were stopped, so it might still be
1413 * pending. Before flushing the queues we need to be sure the
1414 * message is handled by the tasklet handling pending messages,
1415 * otherwise we might start destroying the station before
1416 * sending the teardown packet.
1417 * Note that this only forces the tasklet to flush pendings -
1418 * not to stop the tasklet from rescheduling itself.
1420 tasklet_kill(&local->tx_pending_tasklet);
1421 /* flush a potentially queued teardown packet */
1422 ieee80211_flush_queues(local, sdata, false);
1424 ret = sta_info_destroy_addr(sdata, peer);
1426 mutex_lock(&local->sta_mtx);
1427 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1428 mutex_unlock(&local->sta_mtx);
1430 iee80211_tdls_recalc_chanctx(sdata, NULL);
1437 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1438 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1439 eth_zero_addr(sdata->u.mgd.tdls_peer);
1443 ieee80211_queue_work(&sdata->local->hw,
1444 &sdata->u.mgd.request_smps_work);
1446 mutex_unlock(&local->mtx);
1447 sdata_unlock(sdata);
1451 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1452 enum nl80211_tdls_operation oper,
1453 u16 reason_code, gfp_t gfp)
1455 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1457 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1458 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1463 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1465 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1468 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1470 struct ieee80211_ch_switch_timing *ch_sw;
1472 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1473 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1475 ch_sw = (void *)buf;
1476 ch_sw->switch_time = cpu_to_le16(switch_time);
1477 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1480 /* find switch timing IE in SKB ready for Tx */
1481 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1483 struct ieee80211_tdls_data *tf;
1487 * Get the offset for the new location of the switch timing IE.
1488 * The SKB network header will now point to the "payload_type"
1489 * element of the TDLS data frame struct.
1491 tf = container_of(skb->data + skb_network_offset(skb),
1492 struct ieee80211_tdls_data, payload_type);
1493 ie_start = tf->u.chan_switch_req.variable;
1494 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1495 skb->len - (ie_start - skb->data));
1498 static struct sk_buff *
1499 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1500 struct cfg80211_chan_def *chandef,
1501 u32 *ch_sw_tm_ie_offset)
1503 struct ieee80211_sub_if_data *sdata = sta->sdata;
1504 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1505 2 + sizeof(struct ieee80211_ch_switch_timing)];
1506 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1507 u8 *pos = extra_ies;
1508 struct sk_buff *skb;
1511 * if chandef points to a wide channel add a Secondary-Channel
1512 * Offset information element
1514 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1515 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1518 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1519 *pos++ = sizeof(*sec_chan_ie);
1520 sec_chan_ie = (void *)pos;
1522 ht40plus = cfg80211_get_chandef_type(chandef) ==
1523 NL80211_CHAN_HT40PLUS;
1524 sec_chan_ie->sec_chan_offs = ht40plus ?
1525 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1526 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1527 pos += sizeof(*sec_chan_ie);
1529 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1532 /* just set the values to 0, this is a template */
1533 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1535 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1536 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1537 0, 0, !sta->sta.tdls_initiator,
1538 extra_ies, extra_ies_len,
1539 oper_class, chandef);
1543 skb = ieee80211_build_data_template(sdata, skb, 0);
1545 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1549 if (ch_sw_tm_ie_offset) {
1550 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1553 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1554 dev_kfree_skb_any(skb);
1558 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1562 "TDLS channel switch request template for %pM ch %d width %d\n",
1563 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1568 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1569 const u8 *addr, u8 oper_class,
1570 struct cfg80211_chan_def *chandef)
1572 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1573 struct ieee80211_local *local = sdata->local;
1574 struct sta_info *sta;
1575 struct sk_buff *skb = NULL;
1579 mutex_lock(&local->sta_mtx);
1580 sta = sta_info_get(sdata, addr);
1583 "Invalid TDLS peer %pM for channel switch request\n",
1589 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1590 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1596 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1603 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1604 chandef, skb, ch_sw_tm_ie);
1606 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1609 mutex_unlock(&local->sta_mtx);
1610 dev_kfree_skb_any(skb);
1615 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1616 struct net_device *dev,
1619 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1620 struct ieee80211_local *local = sdata->local;
1621 struct sta_info *sta;
1623 mutex_lock(&local->sta_mtx);
1624 sta = sta_info_get(sdata, addr);
1627 "Invalid TDLS peer %pM for channel switch cancel\n",
1632 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1633 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1638 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1639 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1642 mutex_unlock(&local->sta_mtx);
1645 static struct sk_buff *
1646 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1647 u32 *ch_sw_tm_ie_offset)
1649 struct ieee80211_sub_if_data *sdata = sta->sdata;
1650 struct sk_buff *skb;
1651 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1653 /* initial timing are always zero in the template */
1654 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1656 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1657 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1658 0, 0, !sta->sta.tdls_initiator,
1659 extra_ies, sizeof(extra_ies), 0, NULL);
1663 skb = ieee80211_build_data_template(sdata, skb, 0);
1666 "Failed building TDLS channel switch resp frame\n");
1670 if (ch_sw_tm_ie_offset) {
1671 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1675 "No switch timing IE in TDLS switch resp\n");
1676 dev_kfree_skb_any(skb);
1680 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1683 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1689 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1690 struct sk_buff *skb)
1692 struct ieee80211_local *local = sdata->local;
1693 struct ieee802_11_elems elems;
1694 struct sta_info *sta;
1695 struct ieee80211_tdls_data *tf = (void *)skb->data;
1696 bool local_initiator;
1697 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1698 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1699 struct ieee80211_tdls_ch_sw_params params = {};
1702 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1703 params.timestamp = rx_status->device_timestamp;
1705 if (skb->len < baselen) {
1706 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1711 mutex_lock(&local->sta_mtx);
1712 sta = sta_info_get(sdata, tf->sa);
1713 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1714 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1720 params.sta = &sta->sta;
1721 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1722 if (params.status != 0) {
1727 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1728 skb->len - baselen, false, &elems);
1729 if (elems.parse_error) {
1730 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1735 if (!elems.ch_sw_timing || !elems.lnk_id) {
1736 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1741 /* validate the initiator is set correctly */
1743 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1744 if (local_initiator == sta->sta.tdls_initiator) {
1745 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1750 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1751 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1754 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie);
1755 if (!params.tmpl_skb) {
1762 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms);
1765 "TDLS channel switch response received from %pM status %d\n",
1766 tf->sa, params.status);
1769 mutex_unlock(&local->sta_mtx);
1770 dev_kfree_skb_any(params.tmpl_skb);
1775 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1776 struct sk_buff *skb)
1778 struct ieee80211_local *local = sdata->local;
1779 struct ieee802_11_elems elems;
1780 struct cfg80211_chan_def chandef;
1781 struct ieee80211_channel *chan;
1782 enum nl80211_channel_type chan_type;
1784 u8 target_channel, oper_class;
1785 bool local_initiator;
1786 struct sta_info *sta;
1787 enum nl80211_band band;
1788 struct ieee80211_tdls_data *tf = (void *)skb->data;
1789 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1790 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1791 struct ieee80211_tdls_ch_sw_params params = {};
1794 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1795 params.timestamp = rx_status->device_timestamp;
1797 if (skb->len < baselen) {
1798 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1803 target_channel = tf->u.chan_switch_req.target_channel;
1804 oper_class = tf->u.chan_switch_req.oper_class;
1807 * We can't easily infer the channel band. The operating class is
1808 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1809 * solution here is to treat channels with number >14 as 5GHz ones,
1810 * and specifically check for the (oper_class, channel) combinations
1811 * where this doesn't hold. These are thankfully unique according to
1813 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1816 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1817 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1818 target_channel < 14)
1819 band = NL80211_BAND_5GHZ;
1821 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1824 freq = ieee80211_channel_to_frequency(target_channel, band);
1826 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1831 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1834 "Unsupported channel for TDLS chan switch: %d\n",
1839 ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1840 skb->len - baselen, false, &elems);
1841 if (elems.parse_error) {
1842 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1846 if (!elems.ch_sw_timing || !elems.lnk_id) {
1847 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1851 if (!elems.sec_chan_offs) {
1852 chan_type = NL80211_CHAN_HT20;
1854 switch (elems.sec_chan_offs->sec_chan_offs) {
1855 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1856 chan_type = NL80211_CHAN_HT40PLUS;
1858 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1859 chan_type = NL80211_CHAN_HT40MINUS;
1862 chan_type = NL80211_CHAN_HT20;
1867 cfg80211_chandef_create(&chandef, chan, chan_type);
1869 /* we will be active on the TDLS link */
1870 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1871 sdata->wdev.iftype)) {
1872 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1876 mutex_lock(&local->sta_mtx);
1877 sta = sta_info_get(sdata, tf->sa);
1878 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1879 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1885 params.sta = &sta->sta;
1887 /* validate the initiator is set correctly */
1889 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1890 if (local_initiator == sta->sta.tdls_initiator) {
1891 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1896 /* peer should have known better */
1897 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1898 elems.sec_chan_offs->sec_chan_offs) {
1899 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1904 params.chandef = &chandef;
1905 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1906 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1909 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1910 ¶ms.ch_sw_tm_ie);
1911 if (!params.tmpl_skb) {
1916 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms);
1919 "TDLS ch switch request received from %pM ch %d width %d\n",
1920 tf->sa, params.chandef->chan->center_freq,
1921 params.chandef->width);
1923 mutex_unlock(&local->sta_mtx);
1924 dev_kfree_skb_any(params.tmpl_skb);
1929 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1930 struct sk_buff *skb)
1932 struct ieee80211_tdls_data *tf = (void *)skb->data;
1933 struct wiphy *wiphy = sdata->local->hw.wiphy;
1937 /* make sure the driver supports it */
1938 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1941 /* we want to access the entire packet */
1942 if (skb_linearize(skb))
1945 * The packet/size was already validated by mac80211 Rx path, only look
1946 * at the action type.
1948 switch (tf->action_code) {
1949 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1950 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1952 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1953 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1961 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1963 struct sta_info *sta;
1964 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1967 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1968 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1969 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1972 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1973 NL80211_TDLS_TEARDOWN, reason,
1979 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1981 struct ieee80211_local *local =
1982 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1983 struct ieee80211_sub_if_data *sdata;
1984 struct sk_buff *skb;
1985 struct ieee80211_tdls_data *tf;
1988 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1989 tf = (struct ieee80211_tdls_data *)skb->data;
1990 list_for_each_entry(sdata, &local->interfaces, list) {
1991 if (!ieee80211_sdata_running(sdata) ||
1992 sdata->vif.type != NL80211_IFTYPE_STATION ||
1993 !ether_addr_equal(tf->da, sdata->vif.addr))
1996 ieee80211_process_tdls_channel_switch(sdata, skb);
2005 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
2006 const u8 *peer, u16 reason)
2008 struct ieee80211_sta *sta;
2011 sta = ieee80211_find_sta(&sdata->vif, peer);
2012 if (!sta || !sta->tdls) {
2018 tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
2020 ieee80211_get_reason_code_string(reason));
2022 ieee80211_tdls_oper_request(&sdata->vif, peer,
2023 NL80211_TDLS_TEARDOWN,
2024 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,