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
8 * This file is GPLv2 as found in COPYING.
11 #include <linux/ieee80211.h>
12 #include <linux/log2.h>
13 #include <net/cfg80211.h>
14 #include "ieee80211_i.h"
15 #include "driver-ops.h"
17 /* give usermode some time for retries in setting up the TDLS session */
18 #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
20 void ieee80211_tdls_peer_del_work(struct work_struct *wk)
22 struct ieee80211_sub_if_data *sdata;
23 struct ieee80211_local *local;
25 sdata = container_of(wk, struct ieee80211_sub_if_data,
26 u.mgd.tdls_peer_del_work.work);
29 mutex_lock(&local->mtx);
30 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
31 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
32 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
33 eth_zero_addr(sdata->u.mgd.tdls_peer);
35 mutex_unlock(&local->mtx);
38 static void ieee80211_tdls_add_ext_capab(struct ieee80211_local *local,
41 u8 *pos = (void *)skb_put(skb, 7);
42 bool chan_switch = local->hw.wiphy->features &
43 NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
45 *pos++ = WLAN_EID_EXT_CAPABILITY;
50 *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
51 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
55 ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
56 struct sk_buff *skb, u16 start, u16 end,
59 u8 subband_cnt = 0, ch_cnt = 0;
60 struct ieee80211_channel *ch;
61 struct cfg80211_chan_def chandef;
64 for (i = start; i <= end; i += spacing) {
68 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
70 /* we will be active on the channel */
71 cfg80211_chandef_create(&chandef, ch,
73 if (cfg80211_reg_can_beacon(sdata->local->hw.wiphy,
75 sdata->wdev.iftype)) {
78 * check if the next channel is also part of
86 * we've reached the end of a range, with allowed channels
90 u8 *pos = skb_put(skb, 2);
91 *pos++ = ieee80211_frequency_to_channel(subband_start);
99 /* all channels in the requested range are allowed - add them here */
101 u8 *pos = skb_put(skb, 2);
102 *pos++ = ieee80211_frequency_to_channel(subband_start);
112 ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
116 * Add possible channels for TDLS. These are channels that are allowed
120 u8 *pos = skb_put(skb, 2);
122 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
125 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
126 * this doesn't happen in real world scenarios.
129 /* 2GHz, with 5MHz spacing */
130 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
132 /* 5GHz, with 20MHz spacing */
133 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
136 *pos = 2 * subband_cnt;
139 static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
145 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
149 pos = skb_put(skb, 4);
150 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
151 *pos++ = 2; /* len */
154 *pos++ = op_class; /* give current operating class as alternate too */
157 static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
159 u8 *pos = (void *)skb_put(skb, 3);
161 *pos++ = WLAN_EID_BSS_COEX_2040;
162 *pos++ = 1; /* len */
164 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
167 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
170 struct ieee80211_local *local = sdata->local;
173 /* The capability will be 0 when sending a failure code */
174 if (status_code != 0)
178 if (ieee80211_get_sdata_band(sdata) != IEEE80211_BAND_2GHZ)
181 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
182 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
183 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
184 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
189 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
190 struct sk_buff *skb, const u8 *peer,
193 struct ieee80211_tdls_lnkie *lnkid;
194 const u8 *init_addr, *rsp_addr;
197 init_addr = sdata->vif.addr;
201 rsp_addr = sdata->vif.addr;
204 lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
206 lnkid->ie_type = WLAN_EID_LINK_ID;
207 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
209 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
210 memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
211 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
215 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
217 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
218 u8 *pos = (void *)skb_put(skb, 4);
220 *pos++ = WLAN_EID_AID;
221 *pos++ = 2; /* len */
222 put_unaligned_le16(ifmgd->aid, pos);
225 /* translate numbering in the WMM parameter IE to the mac80211 notation */
226 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
232 return IEEE80211_AC_BE;
234 return IEEE80211_AC_BK;
236 return IEEE80211_AC_VI;
238 return IEEE80211_AC_VO;
242 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
249 ret |= (aci << 5) & 0x60;
253 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
255 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
256 ((ilog2(cw_max + 1) << 0x4) & 0xf0);
259 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
262 struct ieee80211_wmm_param_ie *wmm;
263 struct ieee80211_tx_queue_params *txq;
266 wmm = (void *)skb_put(skb, sizeof(*wmm));
267 memset(wmm, 0, sizeof(*wmm));
269 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
270 wmm->len = sizeof(*wmm) - 2;
272 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
275 wmm->oui_type = 2; /* WME */
276 wmm->oui_subtype = 1; /* WME param */
277 wmm->version = 1; /* WME ver */
278 wmm->qos_info = 0; /* U-APSD not in use */
281 * Use the EDCA parameters defined for the BSS, or default if the AP
282 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
284 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
285 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
286 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
288 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
289 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
294 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
295 struct sk_buff *skb, const u8 *peer,
296 u8 action_code, bool initiator,
297 const u8 *extra_ies, size_t extra_ies_len)
299 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
300 struct ieee80211_local *local = sdata->local;
301 struct ieee80211_supported_band *sband;
302 struct ieee80211_sta_ht_cap ht_cap;
303 struct ieee80211_sta_vht_cap vht_cap;
304 struct sta_info *sta = NULL;
305 size_t offset = 0, noffset;
308 ieee80211_add_srates_ie(sdata, skb, false, band);
309 ieee80211_add_ext_srates_ie(sdata, skb, false, band);
310 ieee80211_tdls_add_supp_channels(sdata, skb);
312 /* add any custom IEs that go before Extended Capabilities */
314 static const u8 before_ext_cap[] = {
317 WLAN_EID_EXT_SUPP_RATES,
318 WLAN_EID_SUPPORTED_CHANNELS,
321 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
323 ARRAY_SIZE(before_ext_cap),
325 pos = skb_put(skb, noffset - offset);
326 memcpy(pos, extra_ies + offset, noffset - offset);
330 ieee80211_tdls_add_ext_capab(local, skb);
332 /* add the QoS element if we support it */
333 if (local->hw.queues >= IEEE80211_NUM_ACS &&
334 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
335 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
337 /* add any custom IEs that go before HT capabilities */
339 static const u8 before_ht_cap[] = {
342 WLAN_EID_EXT_SUPP_RATES,
343 WLAN_EID_SUPPORTED_CHANNELS,
345 WLAN_EID_EXT_CAPABILITY,
347 WLAN_EID_FAST_BSS_TRANSITION,
348 WLAN_EID_TIMEOUT_INTERVAL,
349 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
351 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
353 ARRAY_SIZE(before_ht_cap),
355 pos = skb_put(skb, noffset - offset);
356 memcpy(pos, extra_ies + offset, noffset - offset);
362 /* we should have the peer STA if we're already responding */
363 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
364 sta = sta_info_get(sdata, peer);
365 if (WARN_ON_ONCE(!sta)) {
371 ieee80211_tdls_add_oper_classes(sdata, skb);
374 * with TDLS we can switch channels, and HT-caps are not necessarily
375 * the same on all bands. The specification limits the setup to a
376 * single HT-cap, so use the current band for now.
378 sband = local->hw.wiphy->bands[band];
379 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
381 if (action_code == WLAN_TDLS_SETUP_REQUEST && ht_cap.ht_supported) {
382 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
384 /* disable SMPS in TDLS initiator */
385 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
386 << IEEE80211_HT_CAP_SM_PS_SHIFT;
388 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
389 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
390 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
391 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
392 /* disable SMPS in TDLS responder */
393 sta->sta.ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
394 << IEEE80211_HT_CAP_SM_PS_SHIFT;
396 /* the peer caps are already intersected with our own */
397 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
399 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
400 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
403 if (ht_cap.ht_supported &&
404 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
405 ieee80211_tdls_add_bss_coex_ie(skb);
407 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
409 /* add any custom IEs that go before VHT capabilities */
411 static const u8 before_vht_cap[] = {
414 WLAN_EID_EXT_SUPP_RATES,
415 WLAN_EID_SUPPORTED_CHANNELS,
417 WLAN_EID_EXT_CAPABILITY,
419 WLAN_EID_FAST_BSS_TRANSITION,
420 WLAN_EID_TIMEOUT_INTERVAL,
421 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
424 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
426 ARRAY_SIZE(before_vht_cap),
428 pos = skb_put(skb, noffset - offset);
429 memcpy(pos, extra_ies + offset, noffset - offset);
433 /* build the VHT-cap similarly to the HT-cap */
434 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
435 if (action_code == WLAN_TDLS_SETUP_REQUEST && vht_cap.vht_supported) {
436 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
438 /* the AID is present only when VHT is implemented */
439 ieee80211_tdls_add_aid(sdata, skb);
441 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
442 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
443 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
444 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
445 /* the peer caps are already intersected with our own */
446 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
448 /* the AID is present only when VHT is implemented */
449 ieee80211_tdls_add_aid(sdata, skb);
451 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
452 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
457 /* add any remaining IEs */
459 noffset = extra_ies_len;
460 pos = skb_put(skb, noffset - offset);
461 memcpy(pos, extra_ies + offset, noffset - offset);
467 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
468 struct sk_buff *skb, const u8 *peer,
469 bool initiator, const u8 *extra_ies,
470 size_t extra_ies_len)
472 struct ieee80211_local *local = sdata->local;
473 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
474 size_t offset = 0, noffset;
475 struct sta_info *sta, *ap_sta;
476 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
481 sta = sta_info_get(sdata, peer);
482 ap_sta = sta_info_get(sdata, ifmgd->bssid);
483 if (WARN_ON_ONCE(!sta || !ap_sta)) {
488 /* add any custom IEs that go before the QoS IE */
490 static const u8 before_qos[] = {
493 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
495 ARRAY_SIZE(before_qos),
497 pos = skb_put(skb, noffset - offset);
498 memcpy(pos, extra_ies + offset, noffset - offset);
502 /* add the QoS param IE if both the peer and we support it */
503 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
504 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
506 /* add any custom IEs that go before HT operation */
508 static const u8 before_ht_op[] = {
511 WLAN_EID_FAST_BSS_TRANSITION,
512 WLAN_EID_TIMEOUT_INTERVAL,
514 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
516 ARRAY_SIZE(before_ht_op),
518 pos = skb_put(skb, noffset - offset);
519 memcpy(pos, extra_ies + offset, noffset - offset);
523 /* if HT support is only added in TDLS, we need an HT-operation IE */
524 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
525 struct ieee80211_chanctx_conf *chanctx_conf =
526 rcu_dereference(sdata->vif.chanctx_conf);
527 if (!WARN_ON(!chanctx_conf)) {
528 pos = skb_put(skb, 2 +
529 sizeof(struct ieee80211_ht_operation));
530 /* send an empty HT operation IE */
531 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
532 &chanctx_conf->def, 0);
536 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
538 /* only include VHT-operation if not on the 2.4GHz band */
539 if (band != IEEE80211_BAND_2GHZ && !ap_sta->sta.vht_cap.vht_supported &&
540 sta->sta.vht_cap.vht_supported) {
541 struct ieee80211_chanctx_conf *chanctx_conf =
542 rcu_dereference(sdata->vif.chanctx_conf);
543 if (!WARN_ON(!chanctx_conf)) {
544 pos = skb_put(skb, 2 +
545 sizeof(struct ieee80211_vht_operation));
546 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
553 /* add any remaining IEs */
555 noffset = extra_ies_len;
556 pos = skb_put(skb, noffset - offset);
557 memcpy(pos, extra_ies + offset, noffset - offset);
562 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
563 struct sk_buff *skb, const u8 *peer,
564 bool initiator, const u8 *extra_ies,
565 size_t extra_ies_len, u8 oper_class,
566 struct cfg80211_chan_def *chandef)
568 struct ieee80211_tdls_data *tf;
569 size_t offset = 0, noffset;
572 if (WARN_ON_ONCE(!chandef))
575 tf = (void *)skb->data;
576 tf->u.chan_switch_req.target_channel =
577 ieee80211_frequency_to_channel(chandef->chan->center_freq);
578 tf->u.chan_switch_req.oper_class = oper_class;
581 static const u8 before_lnkie[] = {
582 WLAN_EID_SECONDARY_CHANNEL_OFFSET,
584 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
586 ARRAY_SIZE(before_lnkie),
588 pos = skb_put(skb, noffset - offset);
589 memcpy(pos, extra_ies + offset, noffset - offset);
593 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
595 /* add any remaining IEs */
597 noffset = extra_ies_len;
598 pos = skb_put(skb, noffset - offset);
599 memcpy(pos, extra_ies + offset, noffset - offset);
604 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
605 struct sk_buff *skb, const u8 *peer,
606 u16 status_code, bool initiator,
608 size_t extra_ies_len)
610 if (status_code == 0)
611 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
614 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
617 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
618 struct sk_buff *skb, const u8 *peer,
619 u8 action_code, u16 status_code,
620 bool initiator, const u8 *extra_ies,
621 size_t extra_ies_len, u8 oper_class,
622 struct cfg80211_chan_def *chandef)
624 switch (action_code) {
625 case WLAN_TDLS_SETUP_REQUEST:
626 case WLAN_TDLS_SETUP_RESPONSE:
627 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
628 if (status_code == 0)
629 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
635 case WLAN_TDLS_SETUP_CONFIRM:
636 if (status_code == 0)
637 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
638 initiator, extra_ies,
641 case WLAN_TDLS_TEARDOWN:
642 case WLAN_TDLS_DISCOVERY_REQUEST:
644 memcpy(skb_put(skb, extra_ies_len), extra_ies,
646 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
647 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
649 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
650 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
651 initiator, extra_ies,
653 oper_class, chandef);
655 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
656 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
658 initiator, extra_ies,
666 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
667 const u8 *peer, u8 action_code, u8 dialog_token,
668 u16 status_code, struct sk_buff *skb)
670 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
671 struct ieee80211_tdls_data *tf;
673 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
675 memcpy(tf->da, peer, ETH_ALEN);
676 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
677 tf->ether_type = cpu_to_be16(ETH_P_TDLS);
678 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
680 /* network header is after the ethernet header */
681 skb_set_network_header(skb, ETH_HLEN);
683 switch (action_code) {
684 case WLAN_TDLS_SETUP_REQUEST:
685 tf->category = WLAN_CATEGORY_TDLS;
686 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
688 skb_put(skb, sizeof(tf->u.setup_req));
689 tf->u.setup_req.dialog_token = dialog_token;
690 tf->u.setup_req.capability =
691 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
694 case WLAN_TDLS_SETUP_RESPONSE:
695 tf->category = WLAN_CATEGORY_TDLS;
696 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
698 skb_put(skb, sizeof(tf->u.setup_resp));
699 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
700 tf->u.setup_resp.dialog_token = dialog_token;
701 tf->u.setup_resp.capability =
702 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
705 case WLAN_TDLS_SETUP_CONFIRM:
706 tf->category = WLAN_CATEGORY_TDLS;
707 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
709 skb_put(skb, sizeof(tf->u.setup_cfm));
710 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
711 tf->u.setup_cfm.dialog_token = dialog_token;
713 case WLAN_TDLS_TEARDOWN:
714 tf->category = WLAN_CATEGORY_TDLS;
715 tf->action_code = WLAN_TDLS_TEARDOWN;
717 skb_put(skb, sizeof(tf->u.teardown));
718 tf->u.teardown.reason_code = cpu_to_le16(status_code);
720 case WLAN_TDLS_DISCOVERY_REQUEST:
721 tf->category = WLAN_CATEGORY_TDLS;
722 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
724 skb_put(skb, sizeof(tf->u.discover_req));
725 tf->u.discover_req.dialog_token = dialog_token;
727 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
728 tf->category = WLAN_CATEGORY_TDLS;
729 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
731 skb_put(skb, sizeof(tf->u.chan_switch_req));
733 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
734 tf->category = WLAN_CATEGORY_TDLS;
735 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
737 skb_put(skb, sizeof(tf->u.chan_switch_resp));
738 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
748 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
749 const u8 *peer, u8 action_code, u8 dialog_token,
750 u16 status_code, struct sk_buff *skb)
752 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
753 struct ieee80211_mgmt *mgmt;
755 mgmt = (void *)skb_put(skb, 24);
757 memcpy(mgmt->da, peer, ETH_ALEN);
758 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
759 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
761 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
762 IEEE80211_STYPE_ACTION);
764 switch (action_code) {
765 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
766 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
767 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
768 mgmt->u.action.u.tdls_discover_resp.action_code =
769 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
770 mgmt->u.action.u.tdls_discover_resp.dialog_token =
772 mgmt->u.action.u.tdls_discover_resp.capability =
773 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
783 static struct sk_buff *
784 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
785 const u8 *peer, u8 action_code,
786 u8 dialog_token, u16 status_code,
787 bool initiator, const u8 *extra_ies,
788 size_t extra_ies_len, u8 oper_class,
789 struct cfg80211_chan_def *chandef)
791 struct ieee80211_local *local = sdata->local;
795 skb = netdev_alloc_skb(sdata->dev,
796 local->hw.extra_tx_headroom +
797 max(sizeof(struct ieee80211_mgmt),
798 sizeof(struct ieee80211_tdls_data)) +
799 50 + /* supported rates */
801 26 + /* max(WMM-info, WMM-param) */
802 2 + max(sizeof(struct ieee80211_ht_cap),
803 sizeof(struct ieee80211_ht_operation)) +
804 2 + max(sizeof(struct ieee80211_vht_cap),
805 sizeof(struct ieee80211_vht_operation)) +
806 50 + /* supported channels */
807 3 + /* 40/20 BSS coex */
809 4 + /* oper classes */
811 sizeof(struct ieee80211_tdls_lnkie));
815 skb_reserve(skb, local->hw.extra_tx_headroom);
817 switch (action_code) {
818 case WLAN_TDLS_SETUP_REQUEST:
819 case WLAN_TDLS_SETUP_RESPONSE:
820 case WLAN_TDLS_SETUP_CONFIRM:
821 case WLAN_TDLS_TEARDOWN:
822 case WLAN_TDLS_DISCOVERY_REQUEST:
823 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
824 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
825 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
827 action_code, dialog_token,
830 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
831 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
833 dialog_token, status_code,
844 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
845 initiator, extra_ies, extra_ies_len, oper_class,
855 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
856 const u8 *peer, u8 action_code, u8 dialog_token,
857 u16 status_code, u32 peer_capability,
858 bool initiator, const u8 *extra_ies,
859 size_t extra_ies_len, u8 oper_class,
860 struct cfg80211_chan_def *chandef)
862 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
863 struct sk_buff *skb = NULL;
864 struct sta_info *sta;
869 sta = sta_info_get(sdata, peer);
871 /* infer the initiator if we can, to support old userspace */
872 switch (action_code) {
873 case WLAN_TDLS_SETUP_REQUEST:
875 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
876 sta->sta.tdls_initiator = false;
879 case WLAN_TDLS_SETUP_CONFIRM:
880 case WLAN_TDLS_DISCOVERY_REQUEST:
883 case WLAN_TDLS_SETUP_RESPONSE:
885 * In some testing scenarios, we send a request and response.
886 * Make the last packet sent take effect for the initiator
890 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
891 sta->sta.tdls_initiator = true;
894 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
897 case WLAN_TDLS_TEARDOWN:
898 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
899 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
900 /* any value is ok */
907 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
914 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
915 dialog_token, status_code,
916 initiator, extra_ies,
917 extra_ies_len, oper_class,
924 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
925 ieee80211_tx_skb(sdata, skb);
930 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
931 * we should default to AC_VI.
933 switch (action_code) {
934 case WLAN_TDLS_SETUP_REQUEST:
935 case WLAN_TDLS_SETUP_RESPONSE:
936 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
940 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
946 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
947 * Later, if no ACK is returned from peer, we will re-send the teardown
948 * packet through the AP.
950 if ((action_code == WLAN_TDLS_TEARDOWN) &&
951 (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
952 bool try_resend; /* Should we keep skb for possible resend */
954 /* If not sending directly to peer - no point in keeping skb */
956 sta = sta_info_get(sdata, peer);
957 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
960 spin_lock_bh(&sdata->u.mgd.teardown_lock);
961 if (try_resend && !sdata->u.mgd.teardown_skb) {
962 /* Mark it as requiring TX status callback */
963 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
964 IEEE80211_TX_INTFL_MLME_CONN_TX;
967 * skb is copied since mac80211 will later set
968 * properties that might not be the same as the AP,
969 * such as encryption, QoS, addresses, etc.
971 * No problem if skb_copy() fails, so no need to check.
973 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
974 sdata->u.mgd.orig_teardown_skb = skb;
976 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
979 /* disable bottom halves when entering the Tx path */
981 __ieee80211_subif_start_xmit(skb, dev, flags);
992 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
993 const u8 *peer, u8 action_code, u8 dialog_token,
994 u16 status_code, u32 peer_capability, bool initiator,
995 const u8 *extra_ies, size_t extra_ies_len)
997 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
998 struct ieee80211_local *local = sdata->local;
1001 mutex_lock(&local->mtx);
1003 /* we don't support concurrent TDLS peer setups */
1004 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1005 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1011 * make sure we have a STA representing the peer so we drop or buffer
1012 * non-TDLS-setup frames to the peer. We can't send other packets
1013 * during setup through the AP path.
1014 * Allow error packets to be sent - sometimes we don't even add a STA
1015 * before failing the setup.
1017 if (status_code == 0) {
1019 if (!sta_info_get(sdata, peer)) {
1027 ieee80211_flush_queues(local, sdata, false);
1028 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1029 mutex_unlock(&local->mtx);
1031 /* we cannot take the mutex while preparing the setup packet */
1032 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1033 dialog_token, status_code,
1034 peer_capability, initiator,
1035 extra_ies, extra_ies_len, 0,
1038 mutex_lock(&local->mtx);
1039 eth_zero_addr(sdata->u.mgd.tdls_peer);
1040 mutex_unlock(&local->mtx);
1044 ieee80211_queue_delayed_work(&sdata->local->hw,
1045 &sdata->u.mgd.tdls_peer_del_work,
1046 TDLS_PEER_SETUP_TIMEOUT);
1050 mutex_unlock(&local->mtx);
1055 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1056 const u8 *peer, u8 action_code, u8 dialog_token,
1057 u16 status_code, u32 peer_capability,
1058 bool initiator, const u8 *extra_ies,
1059 size_t extra_ies_len)
1061 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1062 struct ieee80211_local *local = sdata->local;
1063 struct sta_info *sta;
1067 * No packets can be transmitted to the peer via the AP during setup -
1068 * the STA is set as a TDLS peer, but is not authorized.
1069 * During teardown, we prevent direct transmissions by stopping the
1070 * queues and flushing all direct packets.
1072 ieee80211_stop_vif_queues(local, sdata,
1073 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1074 ieee80211_flush_queues(local, sdata, false);
1076 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1077 dialog_token, status_code,
1078 peer_capability, initiator,
1079 extra_ies, extra_ies_len, 0,
1082 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1086 * Remove the STA AUTH flag to force further traffic through the AP. If
1087 * the STA was unreachable, it was already removed.
1090 sta = sta_info_get(sdata, peer);
1092 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1095 ieee80211_wake_vif_queues(local, sdata,
1096 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1101 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1102 const u8 *peer, u8 action_code, u8 dialog_token,
1103 u16 status_code, u32 peer_capability,
1104 bool initiator, const u8 *extra_ies,
1105 size_t extra_ies_len)
1107 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1110 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1113 /* make sure we are in managed mode, and associated */
1114 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1115 !sdata->u.mgd.associated)
1118 switch (action_code) {
1119 case WLAN_TDLS_SETUP_REQUEST:
1120 case WLAN_TDLS_SETUP_RESPONSE:
1121 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1122 dialog_token, status_code,
1123 peer_capability, initiator,
1124 extra_ies, extra_ies_len);
1126 case WLAN_TDLS_TEARDOWN:
1127 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1128 action_code, dialog_token,
1130 peer_capability, initiator,
1131 extra_ies, extra_ies_len);
1133 case WLAN_TDLS_DISCOVERY_REQUEST:
1135 * Protect the discovery so we can hear the TDLS discovery
1136 * response frame. It is transmitted directly and not buffered
1139 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1141 case WLAN_TDLS_SETUP_CONFIRM:
1142 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1143 /* no special handling */
1144 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1149 initiator, extra_ies,
1150 extra_ies_len, 0, NULL);
1157 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1158 action_code, peer, ret);
1162 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1163 const u8 *peer, enum nl80211_tdls_operation oper)
1165 struct sta_info *sta;
1166 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1167 struct ieee80211_local *local = sdata->local;
1170 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1173 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1177 case NL80211_TDLS_ENABLE_LINK:
1178 case NL80211_TDLS_DISABLE_LINK:
1180 case NL80211_TDLS_TEARDOWN:
1181 case NL80211_TDLS_SETUP:
1182 case NL80211_TDLS_DISCOVERY_REQ:
1183 /* We don't support in-driver setup/teardown/discovery */
1187 mutex_lock(&local->mtx);
1188 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1191 case NL80211_TDLS_ENABLE_LINK:
1193 sta = sta_info_get(sdata, peer);
1200 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1203 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1204 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1207 case NL80211_TDLS_DISABLE_LINK:
1209 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1210 * created while the queues were stopped, so it might still be
1211 * pending. Before flushing the queues we need to be sure the
1212 * message is handled by the tasklet handling pending messages,
1213 * otherwise we might start destroying the station before
1214 * sending the teardown packet.
1215 * Note that this only forces the tasklet to flush pendings -
1216 * not to stop the tasklet from rescheduling itself.
1218 tasklet_kill(&local->tx_pending_tasklet);
1219 /* flush a potentially queued teardown packet */
1220 ieee80211_flush_queues(local, sdata, false);
1222 ret = sta_info_destroy_addr(sdata, peer);
1229 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1230 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1231 eth_zero_addr(sdata->u.mgd.tdls_peer);
1234 mutex_unlock(&local->mtx);
1238 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1239 enum nl80211_tdls_operation oper,
1240 u16 reason_code, gfp_t gfp)
1242 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1244 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1245 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1250 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1252 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1255 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1257 struct ieee80211_ch_switch_timing *ch_sw;
1259 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1260 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1262 ch_sw = (void *)buf;
1263 ch_sw->switch_time = cpu_to_le16(switch_time);
1264 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1267 /* find switch timing IE in SKB ready for Tx */
1268 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1270 struct ieee80211_tdls_data *tf;
1274 * Get the offset for the new location of the switch timing IE.
1275 * The SKB network header will now point to the "payload_type"
1276 * element of the TDLS data frame struct.
1278 tf = container_of(skb->data + skb_network_offset(skb),
1279 struct ieee80211_tdls_data, payload_type);
1280 ie_start = tf->u.chan_switch_req.variable;
1281 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1282 skb->len - (ie_start - skb->data));
1285 static struct sk_buff *
1286 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1287 struct cfg80211_chan_def *chandef,
1288 u32 *ch_sw_tm_ie_offset)
1290 struct ieee80211_sub_if_data *sdata = sta->sdata;
1291 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1292 2 + sizeof(struct ieee80211_ch_switch_timing)];
1293 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1294 u8 *pos = extra_ies;
1295 struct sk_buff *skb;
1298 * if chandef points to a wide channel add a Secondary-Channel
1299 * Offset information element
1301 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1302 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1305 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1306 *pos++ = sizeof(*sec_chan_ie);
1307 sec_chan_ie = (void *)pos;
1309 ht40plus = cfg80211_get_chandef_type(chandef) ==
1310 NL80211_CHAN_HT40PLUS;
1311 sec_chan_ie->sec_chan_offs = ht40plus ?
1312 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1313 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1314 pos += sizeof(*sec_chan_ie);
1316 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1319 /* just set the values to 0, this is a template */
1320 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1322 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1323 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1324 0, 0, !sta->sta.tdls_initiator,
1325 extra_ies, extra_ies_len,
1326 oper_class, chandef);
1330 skb = ieee80211_build_data_template(sdata, skb, 0);
1332 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1336 if (ch_sw_tm_ie_offset) {
1337 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1340 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1341 dev_kfree_skb_any(skb);
1345 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1349 "TDLS channel switch request template for %pM ch %d width %d\n",
1350 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1355 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1356 const u8 *addr, u8 oper_class,
1357 struct cfg80211_chan_def *chandef)
1359 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1360 struct ieee80211_local *local = sdata->local;
1361 struct sta_info *sta;
1362 struct sk_buff *skb = NULL;
1366 mutex_lock(&local->sta_mtx);
1367 sta = sta_info_get(sdata, addr);
1370 "Invalid TDLS peer %pM for channel switch request\n",
1376 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1377 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1383 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1390 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1391 chandef, skb, ch_sw_tm_ie);
1393 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1396 mutex_unlock(&local->sta_mtx);
1397 dev_kfree_skb_any(skb);
1402 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1403 struct net_device *dev,
1406 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1407 struct ieee80211_local *local = sdata->local;
1408 struct sta_info *sta;
1410 mutex_lock(&local->sta_mtx);
1411 sta = sta_info_get(sdata, addr);
1414 "Invalid TDLS peer %pM for channel switch cancel\n",
1419 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1420 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1425 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1426 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1429 mutex_unlock(&local->sta_mtx);
1432 static struct sk_buff *
1433 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1434 u32 *ch_sw_tm_ie_offset)
1436 struct ieee80211_sub_if_data *sdata = sta->sdata;
1437 struct sk_buff *skb;
1438 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1440 /* initial timing are always zero in the template */
1441 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1443 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1444 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1445 0, 0, !sta->sta.tdls_initiator,
1446 extra_ies, sizeof(extra_ies), 0, NULL);
1450 skb = ieee80211_build_data_template(sdata, skb, 0);
1453 "Failed building TDLS channel switch resp frame\n");
1457 if (ch_sw_tm_ie_offset) {
1458 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1462 "No switch timing IE in TDLS switch resp\n");
1463 dev_kfree_skb_any(skb);
1467 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1470 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1476 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1477 struct sk_buff *skb)
1479 struct ieee80211_local *local = sdata->local;
1480 struct ieee802_11_elems elems;
1481 struct sta_info *sta;
1482 struct ieee80211_tdls_data *tf = (void *)skb->data;
1483 bool local_initiator;
1484 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1485 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1486 struct ieee80211_tdls_ch_sw_params params = {};
1489 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1490 params.timestamp = rx_status->device_timestamp;
1492 if (skb->len < baselen) {
1493 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1498 mutex_lock(&local->sta_mtx);
1499 sta = sta_info_get(sdata, tf->sa);
1500 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1501 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1507 params.sta = &sta->sta;
1508 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1509 if (params.status != 0) {
1514 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1515 skb->len - baselen, false, &elems);
1516 if (elems.parse_error) {
1517 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1522 if (!elems.ch_sw_timing || !elems.lnk_id) {
1523 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1528 /* validate the initiator is set correctly */
1530 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1531 if (local_initiator == sta->sta.tdls_initiator) {
1532 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1537 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1538 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1541 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie);
1542 if (!params.tmpl_skb) {
1548 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms);
1551 "TDLS channel switch response received from %pM status %d\n",
1552 tf->sa, params.status);
1555 mutex_unlock(&local->sta_mtx);
1556 dev_kfree_skb_any(params.tmpl_skb);
1561 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1562 struct sk_buff *skb)
1564 struct ieee80211_local *local = sdata->local;
1565 struct ieee802_11_elems elems;
1566 struct cfg80211_chan_def chandef;
1567 struct ieee80211_channel *chan;
1568 enum nl80211_channel_type chan_type;
1570 u8 target_channel, oper_class;
1571 bool local_initiator;
1572 struct sta_info *sta;
1573 enum ieee80211_band band;
1574 struct ieee80211_tdls_data *tf = (void *)skb->data;
1575 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1576 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1577 struct ieee80211_tdls_ch_sw_params params = {};
1580 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1581 params.timestamp = rx_status->device_timestamp;
1583 if (skb->len < baselen) {
1584 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1589 target_channel = tf->u.chan_switch_req.target_channel;
1590 oper_class = tf->u.chan_switch_req.oper_class;
1593 * We can't easily infer the channel band. The operating class is
1594 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1595 * solution here is to treat channels with number >14 as 5GHz ones,
1596 * and specifically check for the (oper_class, channel) combinations
1597 * where this doesn't hold. These are thankfully unique according to
1599 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1602 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1603 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1604 target_channel < 14)
1605 band = IEEE80211_BAND_5GHZ;
1607 band = target_channel < 14 ? IEEE80211_BAND_2GHZ :
1608 IEEE80211_BAND_5GHZ;
1610 freq = ieee80211_channel_to_frequency(target_channel, band);
1612 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1617 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1620 "Unsupported channel for TDLS chan switch: %d\n",
1625 ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1626 skb->len - baselen, false, &elems);
1627 if (elems.parse_error) {
1628 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1632 if (!elems.ch_sw_timing || !elems.lnk_id) {
1633 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1637 mutex_lock(&local->sta_mtx);
1638 sta = sta_info_get(sdata, tf->sa);
1639 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1640 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1646 params.sta = &sta->sta;
1648 /* validate the initiator is set correctly */
1650 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1651 if (local_initiator == sta->sta.tdls_initiator) {
1652 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1657 if (!sta->sta.ht_cap.ht_supported) {
1658 chan_type = NL80211_CHAN_NO_HT;
1659 } else if (!elems.sec_chan_offs) {
1660 chan_type = NL80211_CHAN_HT20;
1662 switch (elems.sec_chan_offs->sec_chan_offs) {
1663 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1664 chan_type = NL80211_CHAN_HT40PLUS;
1666 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1667 chan_type = NL80211_CHAN_HT40MINUS;
1670 chan_type = NL80211_CHAN_HT20;
1675 cfg80211_chandef_create(&chandef, chan, chan_type);
1676 params.chandef = &chandef;
1678 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1679 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1682 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1683 ¶ms.ch_sw_tm_ie);
1684 if (!params.tmpl_skb) {
1689 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms);
1692 "TDLS ch switch request received from %pM ch %d width %d\n",
1693 tf->sa, params.chandef->chan->center_freq,
1694 params.chandef->width);
1696 mutex_unlock(&local->sta_mtx);
1697 dev_kfree_skb_any(params.tmpl_skb);
1701 void ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1702 struct sk_buff *skb)
1704 struct ieee80211_tdls_data *tf = (void *)skb->data;
1705 struct wiphy *wiphy = sdata->local->hw.wiphy;
1707 /* make sure the driver supports it */
1708 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1711 /* we want to access the entire packet */
1712 if (skb_linearize(skb))
1715 * The packet/size was already validated by mac80211 Rx path, only look
1716 * at the action type.
1718 switch (tf->action_code) {
1719 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1720 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1722 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1723 ieee80211_process_tdls_channel_switch_resp(sdata, skb);