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 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"
19 /* give usermode some time for retries in setting up the TDLS session */
20 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
22 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
24 struct ieee80211_sub_if_data *sdata;
25 struct ieee80211_local *local;
27 sdata = container_of(wk, struct ieee80211_sub_if_data,
28 u.mgd.tdls_peer_del_work.work);
31 mutex_lock(&local->mtx);
32 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
33 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
34 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
35 eth_zero_addr(sdata->u.mgd.tdls_peer);
37 mutex_unlock(&local->mtx);
40 static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
43 struct ieee80211_local *local = sdata->local;
44 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
45 bool chan_switch = local->hw.wiphy->features &
46 NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
47 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
48 !ifmgd->tdls_wider_bw_prohibited;
49 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
50 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
51 bool vht = sband && sband->vht_cap.vht_supported;
52 u8 *pos = (void *)skb_put(skb, 10);
54 *pos++ = WLAN_EID_EXT_CAPABILITY;
59 *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
60 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
63 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
67 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
68 struct sk_buff *skb, u16 start, u16 end,
71 u8 subband_cnt = 0, ch_cnt = 0;
72 struct ieee80211_channel *ch;
73 struct cfg80211_chan_def chandef;
75 struct wiphy *wiphy = sdata->local->hw.wiphy;
77 for (i = start; i <= end; i += spacing) {
81 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
83 /* we will be active on the channel */
84 cfg80211_chandef_create(&chandef, ch,
86 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
87 sdata->wdev.iftype)) {
90 * check if the next channel is also part of
98 * we've reached the end of a range, with allowed channels
102 u8 *pos = skb_put(skb, 2);
103 *pos++ = ieee80211_frequency_to_channel(subband_start);
111 /* all channels in the requested range are allowed - add them here */
113 u8 *pos = skb_put(skb, 2);
114 *pos++ = ieee80211_frequency_to_channel(subband_start);
124 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
128 * Add possible channels for TDLS. These are channels that are allowed
132 u8 *pos = skb_put(skb, 2);
134 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
137 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
138 * this doesn't happen in real world scenarios.
141 /* 2GHz, with 5MHz spacing */
142 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
144 /* 5GHz, with 20MHz spacing */
145 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
148 *pos = 2 * subband_cnt;
151 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
157 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
161 pos = skb_put(skb, 4);
162 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
163 *pos++ = 2; /* len */
166 *pos++ = op_class; /* give current operating class as alternate too */
169 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
171 u8 *pos = (void *)skb_put(skb, 3);
173 *pos++ = WLAN_EID_BSS_COEX_2040;
174 *pos++ = 1; /* len */
176 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
179 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
182 /* The capability will be 0 when sending a failure code */
183 if (status_code != 0)
186 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_2GHZ) {
187 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
188 WLAN_CAPABILITY_SHORT_PREAMBLE;
194 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
195 struct sk_buff *skb, const u8 *peer,
198 struct ieee80211_tdls_lnkie *lnkid;
199 const u8 *init_addr, *rsp_addr;
202 init_addr = sdata->vif.addr;
206 rsp_addr = sdata->vif.addr;
209 lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
211 lnkid->ie_type = WLAN_EID_LINK_ID;
212 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
214 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
215 memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
216 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
220 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
222 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
223 u8 *pos = (void *)skb_put(skb, 4);
225 *pos++ = WLAN_EID_AID;
226 *pos++ = 2; /* len */
227 put_unaligned_le16(ifmgd->aid, pos);
230 /* translate numbering in the WMM parameter IE to the mac80211 notation */
231 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
237 return IEEE80211_AC_BE;
239 return IEEE80211_AC_BK;
241 return IEEE80211_AC_VI;
243 return IEEE80211_AC_VO;
247 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
254 ret |= (aci << 5) & 0x60;
258 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
260 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
261 ((ilog2(cw_max + 1) << 0x4) & 0xf0);
264 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
267 struct ieee80211_wmm_param_ie *wmm;
268 struct ieee80211_tx_queue_params *txq;
271 wmm = (void *)skb_put(skb, sizeof(*wmm));
272 memset(wmm, 0, sizeof(*wmm));
274 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
275 wmm->len = sizeof(*wmm) - 2;
277 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
280 wmm->oui_type = 2; /* WME */
281 wmm->oui_subtype = 1; /* WME param */
282 wmm->version = 1; /* WME ver */
283 wmm->qos_info = 0; /* U-APSD not in use */
286 * Use the EDCA parameters defined for the BSS, or default if the AP
287 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
289 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
290 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
291 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
293 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
294 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
299 ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
300 struct sta_info *sta)
302 /* IEEE802.11ac-2013 Table E-4 */
303 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
304 struct cfg80211_chan_def uc = sta->tdls_chandef;
305 enum nl80211_chan_width max_width = ieee80211_get_sta_bw(&sta->sta);
308 /* only support upgrading non-narrow channels up to 80Mhz */
309 if (max_width == NL80211_CHAN_WIDTH_5 ||
310 max_width == NL80211_CHAN_WIDTH_10)
313 if (max_width > NL80211_CHAN_WIDTH_80)
314 max_width = NL80211_CHAN_WIDTH_80;
316 if (uc.width == max_width)
319 * Channel usage constrains in the IEEE802.11ac-2013 specification only
320 * allow expanding a 20MHz channel to 80MHz in a single way. In
321 * addition, there are no 40MHz allowed channels that are not part of
322 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
324 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
325 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
326 uc.center_freq1 = centers_80mhz[i];
327 uc.width = NL80211_CHAN_WIDTH_80;
331 if (!uc.center_freq1)
334 /* proceed to downgrade the chandef until usable or the same */
335 while (uc.width > max_width &&
336 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
338 ieee80211_chandef_downgrade(&uc);
340 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
341 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
342 sta->tdls_chandef.width, uc.width);
345 * the station is not yet authorized when BW upgrade is done,
346 * locking is not required
348 sta->tdls_chandef = uc;
353 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
354 struct sk_buff *skb, const u8 *peer,
355 u8 action_code, bool initiator,
356 const u8 *extra_ies, size_t extra_ies_len)
358 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
359 struct ieee80211_local *local = sdata->local;
360 struct ieee80211_supported_band *sband;
361 struct ieee80211_sta_ht_cap ht_cap;
362 struct ieee80211_sta_vht_cap vht_cap;
363 struct sta_info *sta = NULL;
364 size_t offset = 0, noffset;
367 ieee80211_add_srates_ie(sdata, skb, false, band);
368 ieee80211_add_ext_srates_ie(sdata, skb, false, band);
369 ieee80211_tdls_add_supp_channels(sdata, skb);
371 /* add any custom IEs that go before Extended Capabilities */
373 static const u8 before_ext_cap[] = {
376 WLAN_EID_EXT_SUPP_RATES,
377 WLAN_EID_SUPPORTED_CHANNELS,
380 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
382 ARRAY_SIZE(before_ext_cap),
384 pos = skb_put(skb, noffset - offset);
385 memcpy(pos, extra_ies + offset, noffset - offset);
389 ieee80211_tdls_add_ext_capab(sdata, skb);
391 /* add the QoS element if we support it */
392 if (local->hw.queues >= IEEE80211_NUM_ACS &&
393 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
394 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
396 /* add any custom IEs that go before HT capabilities */
398 static const u8 before_ht_cap[] = {
401 WLAN_EID_EXT_SUPP_RATES,
402 WLAN_EID_SUPPORTED_CHANNELS,
404 WLAN_EID_EXT_CAPABILITY,
406 WLAN_EID_FAST_BSS_TRANSITION,
407 WLAN_EID_TIMEOUT_INTERVAL,
408 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
410 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
412 ARRAY_SIZE(before_ht_cap),
414 pos = skb_put(skb, noffset - offset);
415 memcpy(pos, extra_ies + offset, noffset - offset);
419 mutex_lock(&local->sta_mtx);
421 /* we should have the peer STA if we're already responding */
422 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
423 sta = sta_info_get(sdata, peer);
424 if (WARN_ON_ONCE(!sta)) {
425 mutex_unlock(&local->sta_mtx);
429 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
432 ieee80211_tdls_add_oper_classes(sdata, skb);
435 * with TDLS we can switch channels, and HT-caps are not necessarily
436 * the same on all bands. The specification limits the setup to a
437 * single HT-cap, so use the current band for now.
439 sband = local->hw.wiphy->bands[band];
440 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
442 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
443 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
444 ht_cap.ht_supported) {
445 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
447 /* disable SMPS in TDLS initiator */
448 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
449 << IEEE80211_HT_CAP_SM_PS_SHIFT;
451 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
452 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
453 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
454 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
455 /* the peer caps are already intersected with our own */
456 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
458 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
459 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
462 if (ht_cap.ht_supported &&
463 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
464 ieee80211_tdls_add_bss_coex_ie(skb);
466 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
468 /* add any custom IEs that go before VHT capabilities */
470 static const u8 before_vht_cap[] = {
473 WLAN_EID_EXT_SUPP_RATES,
474 WLAN_EID_SUPPORTED_CHANNELS,
476 WLAN_EID_EXT_CAPABILITY,
478 WLAN_EID_FAST_BSS_TRANSITION,
479 WLAN_EID_TIMEOUT_INTERVAL,
480 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
483 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
485 ARRAY_SIZE(before_vht_cap),
487 pos = skb_put(skb, noffset - offset);
488 memcpy(pos, extra_ies + offset, noffset - offset);
492 /* build the VHT-cap similarly to the HT-cap */
493 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
494 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
495 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
496 vht_cap.vht_supported) {
497 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
499 /* the AID is present only when VHT is implemented */
500 if (action_code == WLAN_TDLS_SETUP_REQUEST)
501 ieee80211_tdls_add_aid(sdata, skb);
503 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
504 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
505 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
506 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
507 /* the peer caps are already intersected with our own */
508 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
510 /* the AID is present only when VHT is implemented */
511 ieee80211_tdls_add_aid(sdata, skb);
513 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
514 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
517 * if both peers support WIDER_BW, we can expand the chandef to
518 * a wider compatible one, up to 80MHz
520 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
521 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
524 mutex_unlock(&local->sta_mtx);
526 /* add any remaining IEs */
528 noffset = extra_ies_len;
529 pos = skb_put(skb, noffset - offset);
530 memcpy(pos, extra_ies + offset, noffset - offset);
536 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
537 struct sk_buff *skb, const u8 *peer,
538 bool initiator, const u8 *extra_ies,
539 size_t extra_ies_len)
541 struct ieee80211_local *local = sdata->local;
542 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
543 size_t offset = 0, noffset;
544 struct sta_info *sta, *ap_sta;
545 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
548 mutex_lock(&local->sta_mtx);
550 sta = sta_info_get(sdata, peer);
551 ap_sta = sta_info_get(sdata, ifmgd->bssid);
552 if (WARN_ON_ONCE(!sta || !ap_sta)) {
553 mutex_unlock(&local->sta_mtx);
557 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
559 /* add any custom IEs that go before the QoS IE */
561 static const u8 before_qos[] = {
564 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
566 ARRAY_SIZE(before_qos),
568 pos = skb_put(skb, noffset - offset);
569 memcpy(pos, extra_ies + offset, noffset - offset);
573 /* add the QoS param IE if both the peer and we support it */
574 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
575 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
577 /* add any custom IEs that go before HT operation */
579 static const u8 before_ht_op[] = {
582 WLAN_EID_FAST_BSS_TRANSITION,
583 WLAN_EID_TIMEOUT_INTERVAL,
585 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
587 ARRAY_SIZE(before_ht_op),
589 pos = skb_put(skb, noffset - offset);
590 memcpy(pos, extra_ies + offset, noffset - offset);
594 /* if HT support is only added in TDLS, we need an HT-operation IE */
595 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
596 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
597 /* send an empty HT operation IE */
598 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
599 &sdata->vif.bss_conf.chandef, 0);
602 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
604 /* only include VHT-operation if not on the 2.4GHz band */
605 if (band != IEEE80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) {
607 * if both peers support WIDER_BW, we can expand the chandef to
608 * a wider compatible one, up to 80MHz
610 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
611 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
613 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
614 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
618 mutex_unlock(&local->sta_mtx);
620 /* add any remaining IEs */
622 noffset = extra_ies_len;
623 pos = skb_put(skb, noffset - offset);
624 memcpy(pos, extra_ies + offset, noffset - offset);
629 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
630 struct sk_buff *skb, const u8 *peer,
631 bool initiator, const u8 *extra_ies,
632 size_t extra_ies_len, u8 oper_class,
633 struct cfg80211_chan_def *chandef)
635 struct ieee80211_tdls_data *tf;
636 size_t offset = 0, noffset;
639 if (WARN_ON_ONCE(!chandef))
642 tf = (void *)skb->data;
643 tf->u.chan_switch_req.target_channel =
644 ieee80211_frequency_to_channel(chandef->chan->center_freq);
645 tf->u.chan_switch_req.oper_class = oper_class;
648 static const u8 before_lnkie[] = {
649 WLAN_EID_SECONDARY_CHANNEL_OFFSET,
651 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
653 ARRAY_SIZE(before_lnkie),
655 pos = skb_put(skb, noffset - offset);
656 memcpy(pos, extra_ies + offset, noffset - offset);
660 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
662 /* add any remaining IEs */
664 noffset = extra_ies_len;
665 pos = skb_put(skb, noffset - offset);
666 memcpy(pos, extra_ies + offset, noffset - offset);
671 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
672 struct sk_buff *skb, const u8 *peer,
673 u16 status_code, bool initiator,
675 size_t extra_ies_len)
677 if (status_code == 0)
678 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
681 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
684 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
685 struct sk_buff *skb, const u8 *peer,
686 u8 action_code, u16 status_code,
687 bool initiator, const u8 *extra_ies,
688 size_t extra_ies_len, u8 oper_class,
689 struct cfg80211_chan_def *chandef)
691 switch (action_code) {
692 case WLAN_TDLS_SETUP_REQUEST:
693 case WLAN_TDLS_SETUP_RESPONSE:
694 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
695 if (status_code == 0)
696 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
702 case WLAN_TDLS_SETUP_CONFIRM:
703 if (status_code == 0)
704 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
705 initiator, extra_ies,
708 case WLAN_TDLS_TEARDOWN:
709 case WLAN_TDLS_DISCOVERY_REQUEST:
711 memcpy(skb_put(skb, extra_ies_len), extra_ies,
713 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
714 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
716 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
717 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
718 initiator, extra_ies,
720 oper_class, chandef);
722 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
723 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
725 initiator, extra_ies,
733 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
734 const u8 *peer, u8 action_code, u8 dialog_token,
735 u16 status_code, struct sk_buff *skb)
737 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
738 struct ieee80211_tdls_data *tf;
740 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
742 memcpy(tf->da, peer, ETH_ALEN);
743 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
744 tf->ether_type = cpu_to_be16(ETH_P_TDLS);
745 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
747 /* network header is after the ethernet header */
748 skb_set_network_header(skb, ETH_HLEN);
750 switch (action_code) {
751 case WLAN_TDLS_SETUP_REQUEST:
752 tf->category = WLAN_CATEGORY_TDLS;
753 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
755 skb_put(skb, sizeof(tf->u.setup_req));
756 tf->u.setup_req.dialog_token = dialog_token;
757 tf->u.setup_req.capability =
758 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
761 case WLAN_TDLS_SETUP_RESPONSE:
762 tf->category = WLAN_CATEGORY_TDLS;
763 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
765 skb_put(skb, sizeof(tf->u.setup_resp));
766 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
767 tf->u.setup_resp.dialog_token = dialog_token;
768 tf->u.setup_resp.capability =
769 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
772 case WLAN_TDLS_SETUP_CONFIRM:
773 tf->category = WLAN_CATEGORY_TDLS;
774 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
776 skb_put(skb, sizeof(tf->u.setup_cfm));
777 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
778 tf->u.setup_cfm.dialog_token = dialog_token;
780 case WLAN_TDLS_TEARDOWN:
781 tf->category = WLAN_CATEGORY_TDLS;
782 tf->action_code = WLAN_TDLS_TEARDOWN;
784 skb_put(skb, sizeof(tf->u.teardown));
785 tf->u.teardown.reason_code = cpu_to_le16(status_code);
787 case WLAN_TDLS_DISCOVERY_REQUEST:
788 tf->category = WLAN_CATEGORY_TDLS;
789 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
791 skb_put(skb, sizeof(tf->u.discover_req));
792 tf->u.discover_req.dialog_token = dialog_token;
794 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
795 tf->category = WLAN_CATEGORY_TDLS;
796 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
798 skb_put(skb, sizeof(tf->u.chan_switch_req));
800 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
801 tf->category = WLAN_CATEGORY_TDLS;
802 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
804 skb_put(skb, sizeof(tf->u.chan_switch_resp));
805 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
815 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
816 const u8 *peer, u8 action_code, u8 dialog_token,
817 u16 status_code, struct sk_buff *skb)
819 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
820 struct ieee80211_mgmt *mgmt;
822 mgmt = (void *)skb_put(skb, 24);
824 memcpy(mgmt->da, peer, ETH_ALEN);
825 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
826 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
828 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
829 IEEE80211_STYPE_ACTION);
831 switch (action_code) {
832 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
833 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
834 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
835 mgmt->u.action.u.tdls_discover_resp.action_code =
836 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
837 mgmt->u.action.u.tdls_discover_resp.dialog_token =
839 mgmt->u.action.u.tdls_discover_resp.capability =
840 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
850 static struct sk_buff *
851 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
852 const u8 *peer, u8 action_code,
853 u8 dialog_token, u16 status_code,
854 bool initiator, const u8 *extra_ies,
855 size_t extra_ies_len, u8 oper_class,
856 struct cfg80211_chan_def *chandef)
858 struct ieee80211_local *local = sdata->local;
862 skb = netdev_alloc_skb(sdata->dev,
863 local->hw.extra_tx_headroom +
864 max(sizeof(struct ieee80211_mgmt),
865 sizeof(struct ieee80211_tdls_data)) +
866 50 + /* supported rates */
868 26 + /* max(WMM-info, WMM-param) */
869 2 + max(sizeof(struct ieee80211_ht_cap),
870 sizeof(struct ieee80211_ht_operation)) +
871 2 + max(sizeof(struct ieee80211_vht_cap),
872 sizeof(struct ieee80211_vht_operation)) +
873 50 + /* supported channels */
874 3 + /* 40/20 BSS coex */
876 4 + /* oper classes */
878 sizeof(struct ieee80211_tdls_lnkie));
882 skb_reserve(skb, local->hw.extra_tx_headroom);
884 switch (action_code) {
885 case WLAN_TDLS_SETUP_REQUEST:
886 case WLAN_TDLS_SETUP_RESPONSE:
887 case WLAN_TDLS_SETUP_CONFIRM:
888 case WLAN_TDLS_TEARDOWN:
889 case WLAN_TDLS_DISCOVERY_REQUEST:
890 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
891 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
892 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
894 action_code, dialog_token,
897 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
898 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
900 dialog_token, status_code,
911 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
912 initiator, extra_ies, extra_ies_len, oper_class,
922 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
923 const u8 *peer, u8 action_code, u8 dialog_token,
924 u16 status_code, u32 peer_capability,
925 bool initiator, const u8 *extra_ies,
926 size_t extra_ies_len, u8 oper_class,
927 struct cfg80211_chan_def *chandef)
929 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
930 struct sk_buff *skb = NULL;
931 struct sta_info *sta;
936 sta = sta_info_get(sdata, peer);
938 /* infer the initiator if we can, to support old userspace */
939 switch (action_code) {
940 case WLAN_TDLS_SETUP_REQUEST:
942 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
943 sta->sta.tdls_initiator = false;
946 case WLAN_TDLS_SETUP_CONFIRM:
947 case WLAN_TDLS_DISCOVERY_REQUEST:
950 case WLAN_TDLS_SETUP_RESPONSE:
952 * In some testing scenarios, we send a request and response.
953 * Make the last packet sent take effect for the initiator
957 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
958 sta->sta.tdls_initiator = true;
961 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
964 case WLAN_TDLS_TEARDOWN:
965 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
966 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
967 /* any value is ok */
974 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
981 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
982 dialog_token, status_code,
983 initiator, extra_ies,
984 extra_ies_len, oper_class,
991 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
992 ieee80211_tx_skb(sdata, skb);
997 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
998 * we should default to AC_VI.
1000 switch (action_code) {
1001 case WLAN_TDLS_SETUP_REQUEST:
1002 case WLAN_TDLS_SETUP_RESPONSE:
1003 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
1007 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
1013 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1014 * Later, if no ACK is returned from peer, we will re-send the teardown
1015 * packet through the AP.
1017 if ((action_code == WLAN_TDLS_TEARDOWN) &&
1018 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
1019 bool try_resend; /* Should we keep skb for possible resend */
1021 /* If not sending directly to peer - no point in keeping skb */
1023 sta = sta_info_get(sdata, peer);
1024 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1027 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1028 if (try_resend && !sdata->u.mgd.teardown_skb) {
1029 /* Mark it as requiring TX status callback */
1030 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1031 IEEE80211_TX_INTFL_MLME_CONN_TX;
1034 * skb is copied since mac80211 will later set
1035 * properties that might not be the same as the AP,
1036 * such as encryption, QoS, addresses, etc.
1038 * No problem if skb_copy() fails, so no need to check.
1040 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1041 sdata->u.mgd.orig_teardown_skb = skb;
1043 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1046 /* disable bottom halves when entering the Tx path */
1048 __ieee80211_subif_start_xmit(skb, dev, flags);
1059 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1060 const u8 *peer, u8 action_code, u8 dialog_token,
1061 u16 status_code, u32 peer_capability, bool initiator,
1062 const u8 *extra_ies, size_t extra_ies_len)
1064 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1065 struct ieee80211_local *local = sdata->local;
1066 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
1069 /* don't support setup with forced SMPS mode that's not off */
1070 if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1071 smps_mode != IEEE80211_SMPS_OFF) {
1072 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1077 mutex_lock(&local->mtx);
1079 /* we don't support concurrent TDLS peer setups */
1080 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1081 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1087 * make sure we have a STA representing the peer so we drop or buffer
1088 * non-TDLS-setup frames to the peer. We can't send other packets
1089 * during setup through the AP path.
1090 * Allow error packets to be sent - sometimes we don't even add a STA
1091 * before failing the setup.
1093 if (status_code == 0) {
1095 if (!sta_info_get(sdata, peer)) {
1103 ieee80211_flush_queues(local, sdata, false);
1104 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1105 mutex_unlock(&local->mtx);
1107 /* we cannot take the mutex while preparing the setup packet */
1108 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1109 dialog_token, status_code,
1110 peer_capability, initiator,
1111 extra_ies, extra_ies_len, 0,
1114 mutex_lock(&local->mtx);
1115 eth_zero_addr(sdata->u.mgd.tdls_peer);
1116 mutex_unlock(&local->mtx);
1120 ieee80211_queue_delayed_work(&sdata->local->hw,
1121 &sdata->u.mgd.tdls_peer_del_work,
1122 TDLS_PEER_SETUP_TIMEOUT);
1126 mutex_unlock(&local->mtx);
1131 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1132 const u8 *peer, u8 action_code, u8 dialog_token,
1133 u16 status_code, u32 peer_capability,
1134 bool initiator, const u8 *extra_ies,
1135 size_t extra_ies_len)
1137 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1138 struct ieee80211_local *local = sdata->local;
1139 struct sta_info *sta;
1143 * No packets can be transmitted to the peer via the AP during setup -
1144 * the STA is set as a TDLS peer, but is not authorized.
1145 * During teardown, we prevent direct transmissions by stopping the
1146 * queues and flushing all direct packets.
1148 ieee80211_stop_vif_queues(local, sdata,
1149 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1150 ieee80211_flush_queues(local, sdata, false);
1152 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1153 dialog_token, status_code,
1154 peer_capability, initiator,
1155 extra_ies, extra_ies_len, 0,
1158 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1162 * Remove the STA AUTH flag to force further traffic through the AP. If
1163 * the STA was unreachable, it was already removed.
1166 sta = sta_info_get(sdata, peer);
1168 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1171 ieee80211_wake_vif_queues(local, sdata,
1172 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1177 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1178 const u8 *peer, u8 action_code, u8 dialog_token,
1179 u16 status_code, u32 peer_capability,
1180 bool initiator, const u8 *extra_ies,
1181 size_t extra_ies_len)
1183 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1186 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1189 /* make sure we are in managed mode, and associated */
1190 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1191 !sdata->u.mgd.associated)
1194 switch (action_code) {
1195 case WLAN_TDLS_SETUP_REQUEST:
1196 case WLAN_TDLS_SETUP_RESPONSE:
1197 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1198 dialog_token, status_code,
1199 peer_capability, initiator,
1200 extra_ies, extra_ies_len);
1202 case WLAN_TDLS_TEARDOWN:
1203 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1204 action_code, dialog_token,
1206 peer_capability, initiator,
1207 extra_ies, extra_ies_len);
1209 case WLAN_TDLS_DISCOVERY_REQUEST:
1211 * Protect the discovery so we can hear the TDLS discovery
1212 * response frame. It is transmitted directly and not buffered
1215 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1217 case WLAN_TDLS_SETUP_CONFIRM:
1218 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1219 /* no special handling */
1220 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1225 initiator, extra_ies,
1226 extra_ies_len, 0, NULL);
1233 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1234 action_code, peer, ret);
1238 static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata)
1240 struct ieee80211_local *local = sdata->local;
1241 struct ieee80211_chanctx_conf *conf;
1242 struct ieee80211_chanctx *ctx;
1244 mutex_lock(&local->chanctx_mtx);
1245 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1246 lockdep_is_held(&local->chanctx_mtx));
1248 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1249 ieee80211_recalc_chanctx_chantype(local, ctx);
1251 mutex_unlock(&local->chanctx_mtx);
1254 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1255 const u8 *peer, enum nl80211_tdls_operation oper)
1257 struct sta_info *sta;
1258 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1259 struct ieee80211_local *local = sdata->local;
1262 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1265 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1269 case NL80211_TDLS_ENABLE_LINK:
1270 case NL80211_TDLS_DISABLE_LINK:
1272 case NL80211_TDLS_TEARDOWN:
1273 case NL80211_TDLS_SETUP:
1274 case NL80211_TDLS_DISCOVERY_REQ:
1275 /* We don't support in-driver setup/teardown/discovery */
1279 mutex_lock(&local->mtx);
1280 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1283 case NL80211_TDLS_ENABLE_LINK:
1284 if (sdata->vif.csa_active) {
1285 tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1290 iee80211_tdls_recalc_chanctx(sdata);
1293 sta = sta_info_get(sdata, peer);
1300 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1303 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1304 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1307 case NL80211_TDLS_DISABLE_LINK:
1309 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1310 * created while the queues were stopped, so it might still be
1311 * pending. Before flushing the queues we need to be sure the
1312 * message is handled by the tasklet handling pending messages,
1313 * otherwise we might start destroying the station before
1314 * sending the teardown packet.
1315 * Note that this only forces the tasklet to flush pendings -
1316 * not to stop the tasklet from rescheduling itself.
1318 tasklet_kill(&local->tx_pending_tasklet);
1319 /* flush a potentially queued teardown packet */
1320 ieee80211_flush_queues(local, sdata, false);
1322 ret = sta_info_destroy_addr(sdata, peer);
1323 iee80211_tdls_recalc_chanctx(sdata);
1330 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1331 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1332 eth_zero_addr(sdata->u.mgd.tdls_peer);
1336 ieee80211_queue_work(&sdata->local->hw,
1337 &sdata->u.mgd.request_smps_work);
1339 mutex_unlock(&local->mtx);
1343 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1344 enum nl80211_tdls_operation oper,
1345 u16 reason_code, gfp_t gfp)
1347 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1349 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1350 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1355 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1357 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1360 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1362 struct ieee80211_ch_switch_timing *ch_sw;
1364 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1365 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1367 ch_sw = (void *)buf;
1368 ch_sw->switch_time = cpu_to_le16(switch_time);
1369 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1372 /* find switch timing IE in SKB ready for Tx */
1373 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1375 struct ieee80211_tdls_data *tf;
1379 * Get the offset for the new location of the switch timing IE.
1380 * The SKB network header will now point to the "payload_type"
1381 * element of the TDLS data frame struct.
1383 tf = container_of(skb->data + skb_network_offset(skb),
1384 struct ieee80211_tdls_data, payload_type);
1385 ie_start = tf->u.chan_switch_req.variable;
1386 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1387 skb->len - (ie_start - skb->data));
1390 static struct sk_buff *
1391 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1392 struct cfg80211_chan_def *chandef,
1393 u32 *ch_sw_tm_ie_offset)
1395 struct ieee80211_sub_if_data *sdata = sta->sdata;
1396 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1397 2 + sizeof(struct ieee80211_ch_switch_timing)];
1398 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1399 u8 *pos = extra_ies;
1400 struct sk_buff *skb;
1403 * if chandef points to a wide channel add a Secondary-Channel
1404 * Offset information element
1406 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1407 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1410 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1411 *pos++ = sizeof(*sec_chan_ie);
1412 sec_chan_ie = (void *)pos;
1414 ht40plus = cfg80211_get_chandef_type(chandef) ==
1415 NL80211_CHAN_HT40PLUS;
1416 sec_chan_ie->sec_chan_offs = ht40plus ?
1417 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1418 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1419 pos += sizeof(*sec_chan_ie);
1421 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1424 /* just set the values to 0, this is a template */
1425 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1427 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1428 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1429 0, 0, !sta->sta.tdls_initiator,
1430 extra_ies, extra_ies_len,
1431 oper_class, chandef);
1435 skb = ieee80211_build_data_template(sdata, skb, 0);
1437 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1441 if (ch_sw_tm_ie_offset) {
1442 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1445 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1446 dev_kfree_skb_any(skb);
1450 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1454 "TDLS channel switch request template for %pM ch %d width %d\n",
1455 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1460 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1461 const u8 *addr, u8 oper_class,
1462 struct cfg80211_chan_def *chandef)
1464 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1465 struct ieee80211_local *local = sdata->local;
1466 struct sta_info *sta;
1467 struct sk_buff *skb = NULL;
1471 mutex_lock(&local->sta_mtx);
1472 sta = sta_info_get(sdata, addr);
1475 "Invalid TDLS peer %pM for channel switch request\n",
1481 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1482 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1488 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1495 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1496 chandef, skb, ch_sw_tm_ie);
1498 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1501 mutex_unlock(&local->sta_mtx);
1502 dev_kfree_skb_any(skb);
1507 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1508 struct net_device *dev,
1511 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1512 struct ieee80211_local *local = sdata->local;
1513 struct sta_info *sta;
1515 mutex_lock(&local->sta_mtx);
1516 sta = sta_info_get(sdata, addr);
1519 "Invalid TDLS peer %pM for channel switch cancel\n",
1524 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1525 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1530 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1531 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1534 mutex_unlock(&local->sta_mtx);
1537 static struct sk_buff *
1538 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1539 u32 *ch_sw_tm_ie_offset)
1541 struct ieee80211_sub_if_data *sdata = sta->sdata;
1542 struct sk_buff *skb;
1543 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1545 /* initial timing are always zero in the template */
1546 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1548 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1549 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1550 0, 0, !sta->sta.tdls_initiator,
1551 extra_ies, sizeof(extra_ies), 0, NULL);
1555 skb = ieee80211_build_data_template(sdata, skb, 0);
1558 "Failed building TDLS channel switch resp frame\n");
1562 if (ch_sw_tm_ie_offset) {
1563 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1567 "No switch timing IE in TDLS switch resp\n");
1568 dev_kfree_skb_any(skb);
1572 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1575 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1581 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1582 struct sk_buff *skb)
1584 struct ieee80211_local *local = sdata->local;
1585 struct ieee802_11_elems elems;
1586 struct sta_info *sta;
1587 struct ieee80211_tdls_data *tf = (void *)skb->data;
1588 bool local_initiator;
1589 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1590 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1591 struct ieee80211_tdls_ch_sw_params params = {};
1594 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1595 params.timestamp = rx_status->device_timestamp;
1597 if (skb->len < baselen) {
1598 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1603 mutex_lock(&local->sta_mtx);
1604 sta = sta_info_get(sdata, tf->sa);
1605 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1606 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1612 params.sta = &sta->sta;
1613 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1614 if (params.status != 0) {
1619 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1620 skb->len - baselen, false, &elems);
1621 if (elems.parse_error) {
1622 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1627 if (!elems.ch_sw_timing || !elems.lnk_id) {
1628 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1633 /* validate the initiator is set correctly */
1635 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1636 if (local_initiator == sta->sta.tdls_initiator) {
1637 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1642 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1643 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1646 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie);
1647 if (!params.tmpl_skb) {
1653 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms);
1656 "TDLS channel switch response received from %pM status %d\n",
1657 tf->sa, params.status);
1660 mutex_unlock(&local->sta_mtx);
1661 dev_kfree_skb_any(params.tmpl_skb);
1666 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1667 struct sk_buff *skb)
1669 struct ieee80211_local *local = sdata->local;
1670 struct ieee802_11_elems elems;
1671 struct cfg80211_chan_def chandef;
1672 struct ieee80211_channel *chan;
1673 enum nl80211_channel_type chan_type;
1675 u8 target_channel, oper_class;
1676 bool local_initiator;
1677 struct sta_info *sta;
1678 enum ieee80211_band band;
1679 struct ieee80211_tdls_data *tf = (void *)skb->data;
1680 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1681 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1682 struct ieee80211_tdls_ch_sw_params params = {};
1685 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1686 params.timestamp = rx_status->device_timestamp;
1688 if (skb->len < baselen) {
1689 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1694 target_channel = tf->u.chan_switch_req.target_channel;
1695 oper_class = tf->u.chan_switch_req.oper_class;
1698 * We can't easily infer the channel band. The operating class is
1699 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1700 * solution here is to treat channels with number >14 as 5GHz ones,
1701 * and specifically check for the (oper_class, channel) combinations
1702 * where this doesn't hold. These are thankfully unique according to
1704 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1707 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1708 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1709 target_channel < 14)
1710 band = IEEE80211_BAND_5GHZ;
1712 band = target_channel < 14 ? IEEE80211_BAND_2GHZ :
1713 IEEE80211_BAND_5GHZ;
1715 freq = ieee80211_channel_to_frequency(target_channel, band);
1717 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1722 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1725 "Unsupported channel for TDLS chan switch: %d\n",
1730 ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1731 skb->len - baselen, false, &elems);
1732 if (elems.parse_error) {
1733 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1737 if (!elems.ch_sw_timing || !elems.lnk_id) {
1738 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1742 if (!elems.sec_chan_offs) {
1743 chan_type = NL80211_CHAN_HT20;
1745 switch (elems.sec_chan_offs->sec_chan_offs) {
1746 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1747 chan_type = NL80211_CHAN_HT40PLUS;
1749 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1750 chan_type = NL80211_CHAN_HT40MINUS;
1753 chan_type = NL80211_CHAN_HT20;
1758 cfg80211_chandef_create(&chandef, chan, chan_type);
1760 /* we will be active on the TDLS link */
1761 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1762 sdata->wdev.iftype)) {
1763 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1767 mutex_lock(&local->sta_mtx);
1768 sta = sta_info_get(sdata, tf->sa);
1769 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1770 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1776 params.sta = &sta->sta;
1778 /* validate the initiator is set correctly */
1780 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1781 if (local_initiator == sta->sta.tdls_initiator) {
1782 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1787 /* peer should have known better */
1788 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1789 elems.sec_chan_offs->sec_chan_offs) {
1790 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1795 params.chandef = &chandef;
1796 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1797 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1800 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1801 ¶ms.ch_sw_tm_ie);
1802 if (!params.tmpl_skb) {
1807 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms);
1810 "TDLS ch switch request received from %pM ch %d width %d\n",
1811 tf->sa, params.chandef->chan->center_freq,
1812 params.chandef->width);
1814 mutex_unlock(&local->sta_mtx);
1815 dev_kfree_skb_any(params.tmpl_skb);
1820 ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1821 struct sk_buff *skb)
1823 struct ieee80211_tdls_data *tf = (void *)skb->data;
1824 struct wiphy *wiphy = sdata->local->hw.wiphy;
1828 /* make sure the driver supports it */
1829 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1832 /* we want to access the entire packet */
1833 if (skb_linearize(skb))
1836 * The packet/size was already validated by mac80211 Rx path, only look
1837 * at the action type.
1839 switch (tf->action_code) {
1840 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1841 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1843 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1844 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1852 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1854 struct sta_info *sta;
1855 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1858 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1859 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1860 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1863 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1864 NL80211_TDLS_TEARDOWN, reason,
1870 void ieee80211_tdls_chsw_work(struct work_struct *wk)
1872 struct ieee80211_local *local =
1873 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1874 struct ieee80211_sub_if_data *sdata;
1875 struct sk_buff *skb;
1876 struct ieee80211_tdls_data *tf;
1879 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1880 tf = (struct ieee80211_tdls_data *)skb->data;
1881 list_for_each_entry(sdata, &local->interfaces, list) {
1882 if (!ieee80211_sdata_running(sdata) ||
1883 sdata->vif.type != NL80211_IFTYPE_STATION ||
1884 !ether_addr_equal(tf->da, sdata->vif.addr))
1887 ieee80211_process_tdls_channel_switch(sdata, skb);