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 ||
382 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
383 ht_cap.ht_supported) {
384 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
386 /* disable SMPS in TDLS initiator */
387 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
388 << IEEE80211_HT_CAP_SM_PS_SHIFT;
390 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
391 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
392 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
393 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
394 /* disable SMPS in TDLS responder */
395 sta->sta.ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
396 << IEEE80211_HT_CAP_SM_PS_SHIFT;
398 /* the peer caps are already intersected with our own */
399 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
401 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
402 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
405 if (ht_cap.ht_supported &&
406 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
407 ieee80211_tdls_add_bss_coex_ie(skb);
409 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
411 /* add any custom IEs that go before VHT capabilities */
413 static const u8 before_vht_cap[] = {
416 WLAN_EID_EXT_SUPP_RATES,
417 WLAN_EID_SUPPORTED_CHANNELS,
419 WLAN_EID_EXT_CAPABILITY,
421 WLAN_EID_FAST_BSS_TRANSITION,
422 WLAN_EID_TIMEOUT_INTERVAL,
423 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
426 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
428 ARRAY_SIZE(before_vht_cap),
430 pos = skb_put(skb, noffset - offset);
431 memcpy(pos, extra_ies + offset, noffset - offset);
435 /* build the VHT-cap similarly to the HT-cap */
436 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
437 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
438 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
439 vht_cap.vht_supported) {
440 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
442 /* the AID is present only when VHT is implemented */
443 if (action_code == WLAN_TDLS_SETUP_REQUEST)
444 ieee80211_tdls_add_aid(sdata, skb);
446 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
447 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
448 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
449 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
450 /* the peer caps are already intersected with our own */
451 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
453 /* the AID is present only when VHT is implemented */
454 ieee80211_tdls_add_aid(sdata, skb);
456 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
457 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
462 /* add any remaining IEs */
464 noffset = extra_ies_len;
465 pos = skb_put(skb, noffset - offset);
466 memcpy(pos, extra_ies + offset, noffset - offset);
472 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
473 struct sk_buff *skb, const u8 *peer,
474 bool initiator, const u8 *extra_ies,
475 size_t extra_ies_len)
477 struct ieee80211_local *local = sdata->local;
478 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
479 size_t offset = 0, noffset;
480 struct sta_info *sta, *ap_sta;
481 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
486 sta = sta_info_get(sdata, peer);
487 ap_sta = sta_info_get(sdata, ifmgd->bssid);
488 if (WARN_ON_ONCE(!sta || !ap_sta)) {
493 /* add any custom IEs that go before the QoS IE */
495 static const u8 before_qos[] = {
498 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
500 ARRAY_SIZE(before_qos),
502 pos = skb_put(skb, noffset - offset);
503 memcpy(pos, extra_ies + offset, noffset - offset);
507 /* add the QoS param IE if both the peer and we support it */
508 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
509 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
511 /* add any custom IEs that go before HT operation */
513 static const u8 before_ht_op[] = {
516 WLAN_EID_FAST_BSS_TRANSITION,
517 WLAN_EID_TIMEOUT_INTERVAL,
519 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
521 ARRAY_SIZE(before_ht_op),
523 pos = skb_put(skb, noffset - offset);
524 memcpy(pos, extra_ies + offset, noffset - offset);
528 /* if HT support is only added in TDLS, we need an HT-operation IE */
529 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
530 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
531 /* send an empty HT operation IE */
532 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
533 &sdata->vif.bss_conf.chandef, 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 && sta->sta.vht_cap.vht_supported) {
540 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
541 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
542 &sdata->vif.bss_conf.chandef);
547 /* add any remaining IEs */
549 noffset = extra_ies_len;
550 pos = skb_put(skb, noffset - offset);
551 memcpy(pos, extra_ies + offset, noffset - offset);
556 ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
557 struct sk_buff *skb, const u8 *peer,
558 bool initiator, const u8 *extra_ies,
559 size_t extra_ies_len, u8 oper_class,
560 struct cfg80211_chan_def *chandef)
562 struct ieee80211_tdls_data *tf;
563 size_t offset = 0, noffset;
566 if (WARN_ON_ONCE(!chandef))
569 tf = (void *)skb->data;
570 tf->u.chan_switch_req.target_channel =
571 ieee80211_frequency_to_channel(chandef->chan->center_freq);
572 tf->u.chan_switch_req.oper_class = oper_class;
575 static const u8 before_lnkie[] = {
576 WLAN_EID_SECONDARY_CHANNEL_OFFSET,
578 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
580 ARRAY_SIZE(before_lnkie),
582 pos = skb_put(skb, noffset - offset);
583 memcpy(pos, extra_ies + offset, noffset - offset);
587 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
589 /* add any remaining IEs */
591 noffset = extra_ies_len;
592 pos = skb_put(skb, noffset - offset);
593 memcpy(pos, extra_ies + offset, noffset - offset);
598 ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
599 struct sk_buff *skb, const u8 *peer,
600 u16 status_code, bool initiator,
602 size_t extra_ies_len)
604 if (status_code == 0)
605 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
608 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
611 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
612 struct sk_buff *skb, const u8 *peer,
613 u8 action_code, u16 status_code,
614 bool initiator, const u8 *extra_ies,
615 size_t extra_ies_len, u8 oper_class,
616 struct cfg80211_chan_def *chandef)
618 switch (action_code) {
619 case WLAN_TDLS_SETUP_REQUEST:
620 case WLAN_TDLS_SETUP_RESPONSE:
621 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
622 if (status_code == 0)
623 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
629 case WLAN_TDLS_SETUP_CONFIRM:
630 if (status_code == 0)
631 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
632 initiator, extra_ies,
635 case WLAN_TDLS_TEARDOWN:
636 case WLAN_TDLS_DISCOVERY_REQUEST:
638 memcpy(skb_put(skb, extra_ies_len), extra_ies,
640 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
641 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
643 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
644 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
645 initiator, extra_ies,
647 oper_class, chandef);
649 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
650 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
652 initiator, extra_ies,
660 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
661 const u8 *peer, u8 action_code, u8 dialog_token,
662 u16 status_code, struct sk_buff *skb)
664 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
665 struct ieee80211_tdls_data *tf;
667 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
669 memcpy(tf->da, peer, ETH_ALEN);
670 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
671 tf->ether_type = cpu_to_be16(ETH_P_TDLS);
672 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
674 /* network header is after the ethernet header */
675 skb_set_network_header(skb, ETH_HLEN);
677 switch (action_code) {
678 case WLAN_TDLS_SETUP_REQUEST:
679 tf->category = WLAN_CATEGORY_TDLS;
680 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
682 skb_put(skb, sizeof(tf->u.setup_req));
683 tf->u.setup_req.dialog_token = dialog_token;
684 tf->u.setup_req.capability =
685 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
688 case WLAN_TDLS_SETUP_RESPONSE:
689 tf->category = WLAN_CATEGORY_TDLS;
690 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
692 skb_put(skb, sizeof(tf->u.setup_resp));
693 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
694 tf->u.setup_resp.dialog_token = dialog_token;
695 tf->u.setup_resp.capability =
696 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
699 case WLAN_TDLS_SETUP_CONFIRM:
700 tf->category = WLAN_CATEGORY_TDLS;
701 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
703 skb_put(skb, sizeof(tf->u.setup_cfm));
704 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
705 tf->u.setup_cfm.dialog_token = dialog_token;
707 case WLAN_TDLS_TEARDOWN:
708 tf->category = WLAN_CATEGORY_TDLS;
709 tf->action_code = WLAN_TDLS_TEARDOWN;
711 skb_put(skb, sizeof(tf->u.teardown));
712 tf->u.teardown.reason_code = cpu_to_le16(status_code);
714 case WLAN_TDLS_DISCOVERY_REQUEST:
715 tf->category = WLAN_CATEGORY_TDLS;
716 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
718 skb_put(skb, sizeof(tf->u.discover_req));
719 tf->u.discover_req.dialog_token = dialog_token;
721 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
722 tf->category = WLAN_CATEGORY_TDLS;
723 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
725 skb_put(skb, sizeof(tf->u.chan_switch_req));
727 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
728 tf->category = WLAN_CATEGORY_TDLS;
729 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
731 skb_put(skb, sizeof(tf->u.chan_switch_resp));
732 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
742 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
743 const u8 *peer, u8 action_code, u8 dialog_token,
744 u16 status_code, struct sk_buff *skb)
746 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
747 struct ieee80211_mgmt *mgmt;
749 mgmt = (void *)skb_put(skb, 24);
751 memcpy(mgmt->da, peer, ETH_ALEN);
752 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
753 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
755 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
756 IEEE80211_STYPE_ACTION);
758 switch (action_code) {
759 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
760 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
761 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
762 mgmt->u.action.u.tdls_discover_resp.action_code =
763 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
764 mgmt->u.action.u.tdls_discover_resp.dialog_token =
766 mgmt->u.action.u.tdls_discover_resp.capability =
767 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
777 static struct sk_buff *
778 ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
779 const u8 *peer, u8 action_code,
780 u8 dialog_token, u16 status_code,
781 bool initiator, const u8 *extra_ies,
782 size_t extra_ies_len, u8 oper_class,
783 struct cfg80211_chan_def *chandef)
785 struct ieee80211_local *local = sdata->local;
789 skb = netdev_alloc_skb(sdata->dev,
790 local->hw.extra_tx_headroom +
791 max(sizeof(struct ieee80211_mgmt),
792 sizeof(struct ieee80211_tdls_data)) +
793 50 + /* supported rates */
795 26 + /* max(WMM-info, WMM-param) */
796 2 + max(sizeof(struct ieee80211_ht_cap),
797 sizeof(struct ieee80211_ht_operation)) +
798 2 + max(sizeof(struct ieee80211_vht_cap),
799 sizeof(struct ieee80211_vht_operation)) +
800 50 + /* supported channels */
801 3 + /* 40/20 BSS coex */
803 4 + /* oper classes */
805 sizeof(struct ieee80211_tdls_lnkie));
809 skb_reserve(skb, local->hw.extra_tx_headroom);
811 switch (action_code) {
812 case WLAN_TDLS_SETUP_REQUEST:
813 case WLAN_TDLS_SETUP_RESPONSE:
814 case WLAN_TDLS_SETUP_CONFIRM:
815 case WLAN_TDLS_TEARDOWN:
816 case WLAN_TDLS_DISCOVERY_REQUEST:
817 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
818 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
819 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
821 action_code, dialog_token,
824 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
825 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
827 dialog_token, status_code,
838 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
839 initiator, extra_ies, extra_ies_len, oper_class,
849 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
850 const u8 *peer, u8 action_code, u8 dialog_token,
851 u16 status_code, u32 peer_capability,
852 bool initiator, const u8 *extra_ies,
853 size_t extra_ies_len, u8 oper_class,
854 struct cfg80211_chan_def *chandef)
856 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
857 struct sk_buff *skb = NULL;
858 struct sta_info *sta;
863 sta = sta_info_get(sdata, peer);
865 /* infer the initiator if we can, to support old userspace */
866 switch (action_code) {
867 case WLAN_TDLS_SETUP_REQUEST:
869 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
870 sta->sta.tdls_initiator = false;
873 case WLAN_TDLS_SETUP_CONFIRM:
874 case WLAN_TDLS_DISCOVERY_REQUEST:
877 case WLAN_TDLS_SETUP_RESPONSE:
879 * In some testing scenarios, we send a request and response.
880 * Make the last packet sent take effect for the initiator
884 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
885 sta->sta.tdls_initiator = true;
888 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
891 case WLAN_TDLS_TEARDOWN:
892 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
893 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
894 /* any value is ok */
901 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
908 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
909 dialog_token, status_code,
910 initiator, extra_ies,
911 extra_ies_len, oper_class,
918 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
919 ieee80211_tx_skb(sdata, skb);
924 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
925 * we should default to AC_VI.
927 switch (action_code) {
928 case WLAN_TDLS_SETUP_REQUEST:
929 case WLAN_TDLS_SETUP_RESPONSE:
930 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
934 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
940 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
941 * Later, if no ACK is returned from peer, we will re-send the teardown
942 * packet through the AP.
944 if ((action_code == WLAN_TDLS_TEARDOWN) &&
945 (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
946 bool try_resend; /* Should we keep skb for possible resend */
948 /* If not sending directly to peer - no point in keeping skb */
950 sta = sta_info_get(sdata, peer);
951 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
954 spin_lock_bh(&sdata->u.mgd.teardown_lock);
955 if (try_resend && !sdata->u.mgd.teardown_skb) {
956 /* Mark it as requiring TX status callback */
957 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
958 IEEE80211_TX_INTFL_MLME_CONN_TX;
961 * skb is copied since mac80211 will later set
962 * properties that might not be the same as the AP,
963 * such as encryption, QoS, addresses, etc.
965 * No problem if skb_copy() fails, so no need to check.
967 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
968 sdata->u.mgd.orig_teardown_skb = skb;
970 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
973 /* disable bottom halves when entering the Tx path */
975 __ieee80211_subif_start_xmit(skb, dev, flags);
986 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
987 const u8 *peer, u8 action_code, u8 dialog_token,
988 u16 status_code, u32 peer_capability, bool initiator,
989 const u8 *extra_ies, size_t extra_ies_len)
991 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
992 struct ieee80211_local *local = sdata->local;
995 mutex_lock(&local->mtx);
997 /* we don't support concurrent TDLS peer setups */
998 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
999 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1005 * make sure we have a STA representing the peer so we drop or buffer
1006 * non-TDLS-setup frames to the peer. We can't send other packets
1007 * during setup through the AP path.
1008 * Allow error packets to be sent - sometimes we don't even add a STA
1009 * before failing the setup.
1011 if (status_code == 0) {
1013 if (!sta_info_get(sdata, peer)) {
1021 ieee80211_flush_queues(local, sdata, false);
1022 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1023 mutex_unlock(&local->mtx);
1025 /* we cannot take the mutex while preparing the setup packet */
1026 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1027 dialog_token, status_code,
1028 peer_capability, initiator,
1029 extra_ies, extra_ies_len, 0,
1032 mutex_lock(&local->mtx);
1033 eth_zero_addr(sdata->u.mgd.tdls_peer);
1034 mutex_unlock(&local->mtx);
1038 ieee80211_queue_delayed_work(&sdata->local->hw,
1039 &sdata->u.mgd.tdls_peer_del_work,
1040 TDLS_PEER_SETUP_TIMEOUT);
1044 mutex_unlock(&local->mtx);
1049 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1050 const u8 *peer, u8 action_code, u8 dialog_token,
1051 u16 status_code, u32 peer_capability,
1052 bool initiator, const u8 *extra_ies,
1053 size_t extra_ies_len)
1055 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1056 struct ieee80211_local *local = sdata->local;
1057 struct sta_info *sta;
1061 * No packets can be transmitted to the peer via the AP during setup -
1062 * the STA is set as a TDLS peer, but is not authorized.
1063 * During teardown, we prevent direct transmissions by stopping the
1064 * queues and flushing all direct packets.
1066 ieee80211_stop_vif_queues(local, sdata,
1067 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1068 ieee80211_flush_queues(local, sdata, false);
1070 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1071 dialog_token, status_code,
1072 peer_capability, initiator,
1073 extra_ies, extra_ies_len, 0,
1076 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1080 * Remove the STA AUTH flag to force further traffic through the AP. If
1081 * the STA was unreachable, it was already removed.
1084 sta = sta_info_get(sdata, peer);
1086 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1089 ieee80211_wake_vif_queues(local, sdata,
1090 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1095 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1096 const u8 *peer, u8 action_code, u8 dialog_token,
1097 u16 status_code, u32 peer_capability,
1098 bool initiator, const u8 *extra_ies,
1099 size_t extra_ies_len)
1101 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1104 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1107 /* make sure we are in managed mode, and associated */
1108 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1109 !sdata->u.mgd.associated)
1112 switch (action_code) {
1113 case WLAN_TDLS_SETUP_REQUEST:
1114 case WLAN_TDLS_SETUP_RESPONSE:
1115 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1116 dialog_token, status_code,
1117 peer_capability, initiator,
1118 extra_ies, extra_ies_len);
1120 case WLAN_TDLS_TEARDOWN:
1121 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1122 action_code, dialog_token,
1124 peer_capability, initiator,
1125 extra_ies, extra_ies_len);
1127 case WLAN_TDLS_DISCOVERY_REQUEST:
1129 * Protect the discovery so we can hear the TDLS discovery
1130 * response frame. It is transmitted directly and not buffered
1133 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1135 case WLAN_TDLS_SETUP_CONFIRM:
1136 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1137 /* no special handling */
1138 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1143 initiator, extra_ies,
1144 extra_ies_len, 0, NULL);
1151 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1152 action_code, peer, ret);
1156 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
1157 const u8 *peer, enum nl80211_tdls_operation oper)
1159 struct sta_info *sta;
1160 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1161 struct ieee80211_local *local = sdata->local;
1164 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1167 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1171 case NL80211_TDLS_ENABLE_LINK:
1172 case NL80211_TDLS_DISABLE_LINK:
1174 case NL80211_TDLS_TEARDOWN:
1175 case NL80211_TDLS_SETUP:
1176 case NL80211_TDLS_DISCOVERY_REQ:
1177 /* We don't support in-driver setup/teardown/discovery */
1181 mutex_lock(&local->mtx);
1182 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1185 case NL80211_TDLS_ENABLE_LINK:
1187 sta = sta_info_get(sdata, peer);
1194 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1197 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1198 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
1201 case NL80211_TDLS_DISABLE_LINK:
1203 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1204 * created while the queues were stopped, so it might still be
1205 * pending. Before flushing the queues we need to be sure the
1206 * message is handled by the tasklet handling pending messages,
1207 * otherwise we might start destroying the station before
1208 * sending the teardown packet.
1209 * Note that this only forces the tasklet to flush pendings -
1210 * not to stop the tasklet from rescheduling itself.
1212 tasklet_kill(&local->tx_pending_tasklet);
1213 /* flush a potentially queued teardown packet */
1214 ieee80211_flush_queues(local, sdata, false);
1216 ret = sta_info_destroy_addr(sdata, peer);
1223 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1224 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1225 eth_zero_addr(sdata->u.mgd.tdls_peer);
1228 mutex_unlock(&local->mtx);
1232 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1233 enum nl80211_tdls_operation oper,
1234 u16 reason_code, gfp_t gfp)
1236 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1238 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1239 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1244 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1246 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
1249 iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1251 struct ieee80211_ch_switch_timing *ch_sw;
1253 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1254 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1256 ch_sw = (void *)buf;
1257 ch_sw->switch_time = cpu_to_le16(switch_time);
1258 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1261 /* find switch timing IE in SKB ready for Tx */
1262 static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1264 struct ieee80211_tdls_data *tf;
1268 * Get the offset for the new location of the switch timing IE.
1269 * The SKB network header will now point to the "payload_type"
1270 * element of the TDLS data frame struct.
1272 tf = container_of(skb->data + skb_network_offset(skb),
1273 struct ieee80211_tdls_data, payload_type);
1274 ie_start = tf->u.chan_switch_req.variable;
1275 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1276 skb->len - (ie_start - skb->data));
1279 static struct sk_buff *
1280 ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1281 struct cfg80211_chan_def *chandef,
1282 u32 *ch_sw_tm_ie_offset)
1284 struct ieee80211_sub_if_data *sdata = sta->sdata;
1285 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1286 2 + sizeof(struct ieee80211_ch_switch_timing)];
1287 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1288 u8 *pos = extra_ies;
1289 struct sk_buff *skb;
1292 * if chandef points to a wide channel add a Secondary-Channel
1293 * Offset information element
1295 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1296 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1299 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1300 *pos++ = sizeof(*sec_chan_ie);
1301 sec_chan_ie = (void *)pos;
1303 ht40plus = cfg80211_get_chandef_type(chandef) ==
1304 NL80211_CHAN_HT40PLUS;
1305 sec_chan_ie->sec_chan_offs = ht40plus ?
1306 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1307 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1308 pos += sizeof(*sec_chan_ie);
1310 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1313 /* just set the values to 0, this is a template */
1314 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1316 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1317 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1318 0, 0, !sta->sta.tdls_initiator,
1319 extra_ies, extra_ies_len,
1320 oper_class, chandef);
1324 skb = ieee80211_build_data_template(sdata, skb, 0);
1326 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1330 if (ch_sw_tm_ie_offset) {
1331 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1334 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1335 dev_kfree_skb_any(skb);
1339 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1343 "TDLS channel switch request template for %pM ch %d width %d\n",
1344 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1349 ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1350 const u8 *addr, u8 oper_class,
1351 struct cfg80211_chan_def *chandef)
1353 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1354 struct ieee80211_local *local = sdata->local;
1355 struct sta_info *sta;
1356 struct sk_buff *skb = NULL;
1360 mutex_lock(&local->sta_mtx);
1361 sta = sta_info_get(sdata, addr);
1364 "Invalid TDLS peer %pM for channel switch request\n",
1370 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1371 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1377 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1384 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1385 chandef, skb, ch_sw_tm_ie);
1387 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1390 mutex_unlock(&local->sta_mtx);
1391 dev_kfree_skb_any(skb);
1396 ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1397 struct net_device *dev,
1400 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1401 struct ieee80211_local *local = sdata->local;
1402 struct sta_info *sta;
1404 mutex_lock(&local->sta_mtx);
1405 sta = sta_info_get(sdata, addr);
1408 "Invalid TDLS peer %pM for channel switch cancel\n",
1413 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1414 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1419 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1420 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1423 mutex_unlock(&local->sta_mtx);
1426 static struct sk_buff *
1427 ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1428 u32 *ch_sw_tm_ie_offset)
1430 struct ieee80211_sub_if_data *sdata = sta->sdata;
1431 struct sk_buff *skb;
1432 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1434 /* initial timing are always zero in the template */
1435 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1437 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1438 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1439 0, 0, !sta->sta.tdls_initiator,
1440 extra_ies, sizeof(extra_ies), 0, NULL);
1444 skb = ieee80211_build_data_template(sdata, skb, 0);
1447 "Failed building TDLS channel switch resp frame\n");
1451 if (ch_sw_tm_ie_offset) {
1452 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1456 "No switch timing IE in TDLS switch resp\n");
1457 dev_kfree_skb_any(skb);
1461 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1464 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1470 ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1471 struct sk_buff *skb)
1473 struct ieee80211_local *local = sdata->local;
1474 struct ieee802_11_elems elems;
1475 struct sta_info *sta;
1476 struct ieee80211_tdls_data *tf = (void *)skb->data;
1477 bool local_initiator;
1478 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1479 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1480 struct ieee80211_tdls_ch_sw_params params = {};
1483 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1484 params.timestamp = rx_status->device_timestamp;
1486 if (skb->len < baselen) {
1487 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1492 mutex_lock(&local->sta_mtx);
1493 sta = sta_info_get(sdata, tf->sa);
1494 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1495 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1501 params.sta = &sta->sta;
1502 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1503 if (params.status != 0) {
1508 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1509 skb->len - baselen, false, &elems);
1510 if (elems.parse_error) {
1511 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1516 if (!elems.ch_sw_timing || !elems.lnk_id) {
1517 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1522 /* validate the initiator is set correctly */
1524 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1525 if (local_initiator == sta->sta.tdls_initiator) {
1526 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1531 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1532 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1535 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie);
1536 if (!params.tmpl_skb) {
1542 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms);
1545 "TDLS channel switch response received from %pM status %d\n",
1546 tf->sa, params.status);
1549 mutex_unlock(&local->sta_mtx);
1550 dev_kfree_skb_any(params.tmpl_skb);
1555 ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1556 struct sk_buff *skb)
1558 struct ieee80211_local *local = sdata->local;
1559 struct ieee802_11_elems elems;
1560 struct cfg80211_chan_def chandef;
1561 struct ieee80211_channel *chan;
1562 enum nl80211_channel_type chan_type;
1564 u8 target_channel, oper_class;
1565 bool local_initiator;
1566 struct sta_info *sta;
1567 enum ieee80211_band band;
1568 struct ieee80211_tdls_data *tf = (void *)skb->data;
1569 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1570 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1571 struct ieee80211_tdls_ch_sw_params params = {};
1574 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1575 params.timestamp = rx_status->device_timestamp;
1577 if (skb->len < baselen) {
1578 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1583 target_channel = tf->u.chan_switch_req.target_channel;
1584 oper_class = tf->u.chan_switch_req.oper_class;
1587 * We can't easily infer the channel band. The operating class is
1588 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1589 * solution here is to treat channels with number >14 as 5GHz ones,
1590 * and specifically check for the (oper_class, channel) combinations
1591 * where this doesn't hold. These are thankfully unique according to
1593 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1596 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1597 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1598 target_channel < 14)
1599 band = IEEE80211_BAND_5GHZ;
1601 band = target_channel < 14 ? IEEE80211_BAND_2GHZ :
1602 IEEE80211_BAND_5GHZ;
1604 freq = ieee80211_channel_to_frequency(target_channel, band);
1606 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1611 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1614 "Unsupported channel for TDLS chan switch: %d\n",
1619 ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1620 skb->len - baselen, false, &elems);
1621 if (elems.parse_error) {
1622 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1626 if (!elems.ch_sw_timing || !elems.lnk_id) {
1627 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1631 mutex_lock(&local->sta_mtx);
1632 sta = sta_info_get(sdata, tf->sa);
1633 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1634 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1640 params.sta = &sta->sta;
1642 /* validate the initiator is set correctly */
1644 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1645 if (local_initiator == sta->sta.tdls_initiator) {
1646 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1651 if (!sta->sta.ht_cap.ht_supported) {
1652 chan_type = NL80211_CHAN_NO_HT;
1653 } else if (!elems.sec_chan_offs) {
1654 chan_type = NL80211_CHAN_HT20;
1656 switch (elems.sec_chan_offs->sec_chan_offs) {
1657 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1658 chan_type = NL80211_CHAN_HT40PLUS;
1660 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1661 chan_type = NL80211_CHAN_HT40MINUS;
1664 chan_type = NL80211_CHAN_HT20;
1669 cfg80211_chandef_create(&chandef, chan, chan_type);
1670 params.chandef = &chandef;
1672 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1673 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1676 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1677 ¶ms.ch_sw_tm_ie);
1678 if (!params.tmpl_skb) {
1683 drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms);
1686 "TDLS ch switch request received from %pM ch %d width %d\n",
1687 tf->sa, params.chandef->chan->center_freq,
1688 params.chandef->width);
1690 mutex_unlock(&local->sta_mtx);
1691 dev_kfree_skb_any(params.tmpl_skb);
1695 void ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1696 struct sk_buff *skb)
1698 struct ieee80211_tdls_data *tf = (void *)skb->data;
1699 struct wiphy *wiphy = sdata->local->hw.wiphy;
1701 /* make sure the driver supports it */
1702 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1705 /* we want to access the entire packet */
1706 if (skb_linearize(skb))
1709 * The packet/size was already validated by mac80211 Rx path, only look
1710 * at the action type.
1712 switch (tf->action_code) {
1713 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1714 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1716 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1717 ieee80211_process_tdls_channel_switch_resp(sdata, skb);