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Arik Nemtsov95224fe2014-05-01 10:17:28 +03001/*
2 * mac80211 TDLS handling code
3 *
4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2014, Intel Corporation
Johannes Bergd98ad832014-09-03 15:24:57 +03006 * Copyright 2014 Intel Mobile Communications GmbH
Arik Nemtsov59021c62016-03-02 23:28:32 +02007 * Copyright 2015 - 2016 Intel Deutschland GmbH
Arik Nemtsov95224fe2014-05-01 10:17:28 +03008 *
9 * This file is GPLv2 as found in COPYING.
10 */
11
12#include <linux/ieee80211.h>
Arik Nemtsov6f7eaa42014-07-17 17:14:24 +030013#include <linux/log2.h>
Arik Nemtsovc887f0d32014-06-11 17:18:25 +030014#include <net/cfg80211.h>
Arik Nemtsovc8ff71e2015-07-08 15:41:45 +030015#include <linux/rtnetlink.h>
Arik Nemtsov95224fe2014-05-01 10:17:28 +030016#include "ieee80211_i.h"
Arik Nemtsovee10f2c2014-06-11 17:18:27 +030017#include "driver-ops.h"
Arik Nemtsov59021c62016-03-02 23:28:32 +020018#include "rate.h"
Arik Nemtsov95224fe2014-05-01 10:17:28 +030019
Arik Nemtsov17e6a592014-06-11 17:18:20 +030020/* give usermode some time for retries in setting up the TDLS session */
21#define TDLS_PEER_SETUP_TIMEOUT (15 * HZ)
22
23void ieee80211_tdls_peer_del_work(struct work_struct *wk)
24{
25 struct ieee80211_sub_if_data *sdata;
26 struct ieee80211_local *local;
27
28 sdata = container_of(wk, struct ieee80211_sub_if_data,
Arik Nemtsov81dd2b82014-07-17 17:14:25 +030029 u.mgd.tdls_peer_del_work.work);
Arik Nemtsov17e6a592014-06-11 17:18:20 +030030 local = sdata->local;
31
32 mutex_lock(&local->mtx);
Arik Nemtsov81dd2b82014-07-17 17:14:25 +030033 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
34 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
35 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
36 eth_zero_addr(sdata->u.mgd.tdls_peer);
Arik Nemtsov17e6a592014-06-11 17:18:20 +030037 }
38 mutex_unlock(&local->mtx);
39}
40
Arik Nemtsovb98fb442015-06-10 20:42:59 +030041static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
Arik Nemtsov78632a12014-11-09 18:50:14 +020042 struct sk_buff *skb)
Arik Nemtsov95224fe2014-05-01 10:17:28 +030043{
Arik Nemtsovb98fb442015-06-10 20:42:59 +030044 struct ieee80211_local *local = sdata->local;
Arik Nemtsov82c0cc92015-08-15 22:39:46 +030045 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
Arik Nemtsov78632a12014-11-09 18:50:14 +020046 bool chan_switch = local->hw.wiphy->features &
47 NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
Arik Nemtsov82c0cc92015-08-15 22:39:46 +030048 bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
49 !ifmgd->tdls_wider_bw_prohibited;
Johannes Berg57fbcce2016-04-12 15:56:15 +020050 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
Arik Nemtsovb98fb442015-06-10 20:42:59 +030051 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
52 bool vht = sband && sband->vht_cap.vht_supported;
53 u8 *pos = (void *)skb_put(skb, 10);
Arik Nemtsov95224fe2014-05-01 10:17:28 +030054
55 *pos++ = WLAN_EID_EXT_CAPABILITY;
Arik Nemtsovb98fb442015-06-10 20:42:59 +030056 *pos++ = 8; /* len */
Arik Nemtsov95224fe2014-05-01 10:17:28 +030057 *pos++ = 0x0;
58 *pos++ = 0x0;
59 *pos++ = 0x0;
Arik Nemtsov78632a12014-11-09 18:50:14 +020060 *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
Arik Nemtsov95224fe2014-05-01 10:17:28 +030061 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
Arik Nemtsovb98fb442015-06-10 20:42:59 +030062 *pos++ = 0;
63 *pos++ = 0;
64 *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
Arik Nemtsov95224fe2014-05-01 10:17:28 +030065}
66
Arik Nemtsovf0d29cb2014-11-09 18:50:12 +020067static u8
68ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
69 struct sk_buff *skb, u16 start, u16 end,
70 u16 spacing)
71{
72 u8 subband_cnt = 0, ch_cnt = 0;
73 struct ieee80211_channel *ch;
74 struct cfg80211_chan_def chandef;
75 int i, subband_start;
Arik Nemtsov923b3522015-07-08 15:41:44 +030076 struct wiphy *wiphy = sdata->local->hw.wiphy;
Arik Nemtsovf0d29cb2014-11-09 18:50:12 +020077
78 for (i = start; i <= end; i += spacing) {
79 if (!ch_cnt)
80 subband_start = i;
81
82 ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
83 if (ch) {
84 /* we will be active on the channel */
Arik Nemtsovf0d29cb2014-11-09 18:50:12 +020085 cfg80211_chandef_create(&chandef, ch,
Arik Nemtsov50075892015-01-07 16:45:07 +020086 NL80211_CHAN_NO_HT);
Arik Nemtsov923b3522015-07-08 15:41:44 +030087 if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
88 sdata->wdev.iftype)) {
Arik Nemtsovf0d29cb2014-11-09 18:50:12 +020089 ch_cnt++;
Arik Nemtsov50075892015-01-07 16:45:07 +020090 /*
91 * check if the next channel is also part of
92 * this allowed range
93 */
Arik Nemtsovf0d29cb2014-11-09 18:50:12 +020094 continue;
95 }
96 }
97
Arik Nemtsov50075892015-01-07 16:45:07 +020098 /*
99 * we've reached the end of a range, with allowed channels
100 * found
101 */
Arik Nemtsovf0d29cb2014-11-09 18:50:12 +0200102 if (ch_cnt) {
103 u8 *pos = skb_put(skb, 2);
104 *pos++ = ieee80211_frequency_to_channel(subband_start);
105 *pos++ = ch_cnt;
106
107 subband_cnt++;
108 ch_cnt = 0;
109 }
110 }
111
Arik Nemtsov50075892015-01-07 16:45:07 +0200112 /* all channels in the requested range are allowed - add them here */
113 if (ch_cnt) {
114 u8 *pos = skb_put(skb, 2);
115 *pos++ = ieee80211_frequency_to_channel(subband_start);
116 *pos++ = ch_cnt;
117
118 subband_cnt++;
119 }
120
Arik Nemtsovf0d29cb2014-11-09 18:50:12 +0200121 return subband_cnt;
122}
123
124static void
125ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
126 struct sk_buff *skb)
127{
128 /*
129 * Add possible channels for TDLS. These are channels that are allowed
130 * to be active.
131 */
132 u8 subband_cnt;
133 u8 *pos = skb_put(skb, 2);
134
135 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
136
137 /*
138 * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
139 * this doesn't happen in real world scenarios.
140 */
141
142 /* 2GHz, with 5MHz spacing */
143 subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
144
145 /* 5GHz, with 20MHz spacing */
146 subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
147
148 /* length */
149 *pos = 2 * subband_cnt;
150}
151
Arik Nemtsova38700d2015-03-18 08:46:08 +0200152static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata,
153 struct sk_buff *skb)
154{
155 u8 *pos;
156 u8 op_class;
157
158 if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef,
159 &op_class))
160 return;
161
162 pos = skb_put(skb, 4);
163 *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES;
164 *pos++ = 2; /* len */
165
166 *pos++ = op_class;
167 *pos++ = op_class; /* give current operating class as alternate too */
168}
169
Arik Nemtsov2cedd872014-11-09 18:50:13 +0200170static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
171{
172 u8 *pos = (void *)skb_put(skb, 3);
173
174 *pos++ = WLAN_EID_BSS_COEX_2040;
175 *pos++ = 1; /* len */
176
177 *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
178}
179
Arik Nemtsovdd8c0b02014-07-17 17:14:22 +0300180static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
181 u16 status_code)
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300182{
Arik Nemtsovdd8c0b02014-07-17 17:14:22 +0300183 /* The capability will be 0 when sending a failure code */
184 if (status_code != 0)
185 return 0;
186
Johannes Berg57fbcce2016-04-12 15:56:15 +0200187 if (ieee80211_get_sdata_band(sdata) == NL80211_BAND_2GHZ) {
Johannes Bergea1b2b452015-06-02 20:15:49 +0200188 return WLAN_CAPABILITY_SHORT_SLOT_TIME |
189 WLAN_CAPABILITY_SHORT_PREAMBLE;
190 }
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300191
Johannes Bergea1b2b452015-06-02 20:15:49 +0200192 return 0;
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300193}
194
Arik Nemtsov1606ef42014-07-17 17:14:21 +0300195static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
196 struct sk_buff *skb, const u8 *peer,
197 bool initiator)
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300198{
199 struct ieee80211_tdls_lnkie *lnkid;
Arik Nemtsov1606ef42014-07-17 17:14:21 +0300200 const u8 *init_addr, *rsp_addr;
201
202 if (initiator) {
203 init_addr = sdata->vif.addr;
204 rsp_addr = peer;
205 } else {
206 init_addr = peer;
207 rsp_addr = sdata->vif.addr;
208 }
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300209
210 lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
211
212 lnkid->ie_type = WLAN_EID_LINK_ID;
213 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
214
Arik Nemtsov1606ef42014-07-17 17:14:21 +0300215 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
216 memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
217 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300218}
219
Arik Nemtsovfb28ec02015-03-01 09:10:02 +0200220static void
221ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
222{
223 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
224 u8 *pos = (void *)skb_put(skb, 4);
225
226 *pos++ = WLAN_EID_AID;
227 *pos++ = 2; /* len */
228 put_unaligned_le16(ifmgd->aid, pos);
229}
230
Arik Nemtsov6f7eaa42014-07-17 17:14:24 +0300231/* translate numbering in the WMM parameter IE to the mac80211 notation */
232static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
233{
234 switch (ac) {
235 default:
236 WARN_ON_ONCE(1);
237 case 0:
238 return IEEE80211_AC_BE;
239 case 1:
240 return IEEE80211_AC_BK;
241 case 2:
242 return IEEE80211_AC_VI;
243 case 3:
244 return IEEE80211_AC_VO;
245 }
246}
247
248static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
249{
250 u8 ret;
251
252 ret = aifsn & 0x0f;
253 if (acm)
254 ret |= 0x10;
255 ret |= (aci << 5) & 0x60;
256 return ret;
257}
258
259static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
260{
261 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
262 ((ilog2(cw_max + 1) << 0x4) & 0xf0);
263}
264
265static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
266 struct sk_buff *skb)
267{
268 struct ieee80211_wmm_param_ie *wmm;
269 struct ieee80211_tx_queue_params *txq;
270 int i;
271
272 wmm = (void *)skb_put(skb, sizeof(*wmm));
273 memset(wmm, 0, sizeof(*wmm));
274
275 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
276 wmm->len = sizeof(*wmm) - 2;
277
278 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
279 wmm->oui[1] = 0x50;
280 wmm->oui[2] = 0xf2;
281 wmm->oui_type = 2; /* WME */
282 wmm->oui_subtype = 1; /* WME param */
283 wmm->version = 1; /* WME ver */
284 wmm->qos_info = 0; /* U-APSD not in use */
285
286 /*
287 * Use the EDCA parameters defined for the BSS, or default if the AP
288 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
289 */
290 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
291 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
292 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
293 txq->acm, i);
294 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
295 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
296 }
297}
298
Arik Nemtsovf09a87d2014-07-17 17:14:20 +0300299static void
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300300ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata,
301 struct sta_info *sta)
302{
303 /* IEEE802.11ac-2013 Table E-4 */
304 u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 };
305 struct cfg80211_chan_def uc = sta->tdls_chandef;
Arik Nemtsov59021c62016-03-02 23:28:32 +0200306 enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta);
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300307 int i;
308
309 /* only support upgrading non-narrow channels up to 80Mhz */
310 if (max_width == NL80211_CHAN_WIDTH_5 ||
311 max_width == NL80211_CHAN_WIDTH_10)
312 return;
313
314 if (max_width > NL80211_CHAN_WIDTH_80)
315 max_width = NL80211_CHAN_WIDTH_80;
316
Ilan Peer4b559ec2016-03-08 13:35:31 +0200317 if (uc.width >= max_width)
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300318 return;
319 /*
320 * Channel usage constrains in the IEEE802.11ac-2013 specification only
321 * allow expanding a 20MHz channel to 80MHz in a single way. In
322 * addition, there are no 40MHz allowed channels that are not part of
323 * the allowed 80MHz range in the 5GHz spectrum (the relevant one here).
324 */
325 for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++)
326 if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) {
327 uc.center_freq1 = centers_80mhz[i];
Ilan Peer4b559ec2016-03-08 13:35:31 +0200328 uc.center_freq2 = 0;
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300329 uc.width = NL80211_CHAN_WIDTH_80;
330 break;
331 }
332
333 if (!uc.center_freq1)
334 return;
335
Arik Nemtsov554d0722016-08-29 12:37:35 +0300336 /* proceed to downgrade the chandef until usable or the same as AP BW */
Arik Nemtsovdb8d9972016-03-02 23:28:31 +0200337 while (uc.width > max_width ||
Arik Nemtsov554d0722016-08-29 12:37:35 +0300338 (uc.width > sta->tdls_chandef.width &&
339 !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
340 sdata->wdev.iftype)))
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300341 ieee80211_chandef_downgrade(&uc);
342
343 if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) {
344 tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n",
345 sta->tdls_chandef.width, uc.width);
346
347 /*
348 * the station is not yet authorized when BW upgrade is done,
349 * locking is not required
350 */
351 sta->tdls_chandef = uc;
352 }
353}
354
355static void
Arik Nemtsovf09a87d2014-07-17 17:14:20 +0300356ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
357 struct sk_buff *skb, const u8 *peer,
Arik Nemtsov1606ef42014-07-17 17:14:21 +0300358 u8 action_code, bool initiator,
359 const u8 *extra_ies, size_t extra_ies_len)
Arik Nemtsovf09a87d2014-07-17 17:14:20 +0300360{
Johannes Berg57fbcce2016-04-12 15:56:15 +0200361 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
Arik Nemtsov40b861a2014-07-17 17:14:23 +0300362 struct ieee80211_local *local = sdata->local;
Arik Nemtsov13cc8a42014-07-17 17:14:26 +0300363 struct ieee80211_supported_band *sband;
364 struct ieee80211_sta_ht_cap ht_cap;
Arik Nemtsovfb28ec02015-03-01 09:10:02 +0200365 struct ieee80211_sta_vht_cap vht_cap;
Arik Nemtsov13cc8a42014-07-17 17:14:26 +0300366 struct sta_info *sta = NULL;
Arik Nemtsovf09a87d2014-07-17 17:14:20 +0300367 size_t offset = 0, noffset;
368 u8 *pos;
369
370 ieee80211_add_srates_ie(sdata, skb, false, band);
371 ieee80211_add_ext_srates_ie(sdata, skb, false, band);
Arik Nemtsovf0d29cb2014-11-09 18:50:12 +0200372 ieee80211_tdls_add_supp_channels(sdata, skb);
Arik Nemtsovf09a87d2014-07-17 17:14:20 +0300373
374 /* add any custom IEs that go before Extended Capabilities */
375 if (extra_ies_len) {
376 static const u8 before_ext_cap[] = {
377 WLAN_EID_SUPP_RATES,
378 WLAN_EID_COUNTRY,
379 WLAN_EID_EXT_SUPP_RATES,
380 WLAN_EID_SUPPORTED_CHANNELS,
381 WLAN_EID_RSN,
382 };
383 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
384 before_ext_cap,
385 ARRAY_SIZE(before_ext_cap),
386 offset);
387 pos = skb_put(skb, noffset - offset);
388 memcpy(pos, extra_ies + offset, noffset - offset);
389 offset = noffset;
390 }
391
Arik Nemtsovb98fb442015-06-10 20:42:59 +0300392 ieee80211_tdls_add_ext_capab(sdata, skb);
Arik Nemtsovf09a87d2014-07-17 17:14:20 +0300393
Arik Nemtsov40b861a2014-07-17 17:14:23 +0300394 /* add the QoS element if we support it */
395 if (local->hw.queues >= IEEE80211_NUM_ACS &&
396 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
397 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
398
Arik Nemtsovf09a87d2014-07-17 17:14:20 +0300399 /* add any custom IEs that go before HT capabilities */
400 if (extra_ies_len) {
401 static const u8 before_ht_cap[] = {
402 WLAN_EID_SUPP_RATES,
403 WLAN_EID_COUNTRY,
404 WLAN_EID_EXT_SUPP_RATES,
405 WLAN_EID_SUPPORTED_CHANNELS,
406 WLAN_EID_RSN,
407 WLAN_EID_EXT_CAPABILITY,
408 WLAN_EID_QOS_CAPA,
409 WLAN_EID_FAST_BSS_TRANSITION,
410 WLAN_EID_TIMEOUT_INTERVAL,
411 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
412 };
413 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
414 before_ht_cap,
415 ARRAY_SIZE(before_ht_cap),
416 offset);
417 pos = skb_put(skb, noffset - offset);
418 memcpy(pos, extra_ies + offset, noffset - offset);
419 offset = noffset;
420 }
421
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300422 mutex_lock(&local->sta_mtx);
Arik Nemtsovae2e9fb2015-03-01 09:10:09 +0200423
424 /* we should have the peer STA if we're already responding */
425 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
426 sta = sta_info_get(sdata, peer);
427 if (WARN_ON_ONCE(!sta)) {
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300428 mutex_unlock(&local->sta_mtx);
Arik Nemtsovae2e9fb2015-03-01 09:10:09 +0200429 return;
430 }
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300431
432 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
Arik Nemtsovae2e9fb2015-03-01 09:10:09 +0200433 }
434
Arik Nemtsova38700d2015-03-18 08:46:08 +0200435 ieee80211_tdls_add_oper_classes(sdata, skb);
436
Arik Nemtsov13cc8a42014-07-17 17:14:26 +0300437 /*
438 * with TDLS we can switch channels, and HT-caps are not necessarily
439 * the same on all bands. The specification limits the setup to a
440 * single HT-cap, so use the current band for now.
441 */
442 sband = local->hw.wiphy->bands[band];
443 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
Arik Nemtsov13cc8a42014-07-17 17:14:26 +0300444
Arik Nemtsov070e1762015-03-30 11:16:23 +0300445 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
446 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
447 ht_cap.ht_supported) {
Johannes Bergc5309ba2015-01-23 11:42:14 +0100448 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
Arik Nemtsov13cc8a42014-07-17 17:14:26 +0300449
Johannes Bergc5309ba2015-01-23 11:42:14 +0100450 /* disable SMPS in TDLS initiator */
451 ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED
452 << IEEE80211_HT_CAP_SM_PS_SHIFT;
453
454 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
455 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
456 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
457 ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
Johannes Bergc5309ba2015-01-23 11:42:14 +0100458 /* the peer caps are already intersected with our own */
459 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
Arik Nemtsov13cc8a42014-07-17 17:14:26 +0300460
461 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
462 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
463 }
464
Arik Nemtsov2cedd872014-11-09 18:50:13 +0200465 if (ht_cap.ht_supported &&
466 (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
467 ieee80211_tdls_add_bss_coex_ie(skb);
468
Arik Nemtsovfb28ec02015-03-01 09:10:02 +0200469 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
470
471 /* add any custom IEs that go before VHT capabilities */
472 if (extra_ies_len) {
473 static const u8 before_vht_cap[] = {
474 WLAN_EID_SUPP_RATES,
475 WLAN_EID_COUNTRY,
476 WLAN_EID_EXT_SUPP_RATES,
477 WLAN_EID_SUPPORTED_CHANNELS,
478 WLAN_EID_RSN,
479 WLAN_EID_EXT_CAPABILITY,
480 WLAN_EID_QOS_CAPA,
481 WLAN_EID_FAST_BSS_TRANSITION,
482 WLAN_EID_TIMEOUT_INTERVAL,
483 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
484 WLAN_EID_MULTI_BAND,
485 };
486 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
487 before_vht_cap,
488 ARRAY_SIZE(before_vht_cap),
489 offset);
490 pos = skb_put(skb, noffset - offset);
491 memcpy(pos, extra_ies + offset, noffset - offset);
492 offset = noffset;
493 }
494
495 /* build the VHT-cap similarly to the HT-cap */
496 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
Arik Nemtsov070e1762015-03-30 11:16:23 +0300497 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
498 action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) &&
499 vht_cap.vht_supported) {
Arik Nemtsovfb28ec02015-03-01 09:10:02 +0200500 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
501
502 /* the AID is present only when VHT is implemented */
Arik Nemtsov070e1762015-03-30 11:16:23 +0300503 if (action_code == WLAN_TDLS_SETUP_REQUEST)
504 ieee80211_tdls_add_aid(sdata, skb);
Arik Nemtsovfb28ec02015-03-01 09:10:02 +0200505
506 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
507 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
508 } else if (action_code == WLAN_TDLS_SETUP_RESPONSE &&
509 vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) {
510 /* the peer caps are already intersected with our own */
511 memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap));
512
513 /* the AID is present only when VHT is implemented */
514 ieee80211_tdls_add_aid(sdata, skb);
515
516 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
517 ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap);
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300518
519 /*
520 * if both peers support WIDER_BW, we can expand the chandef to
521 * a wider compatible one, up to 80MHz
522 */
523 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
524 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
Arik Nemtsovfb28ec02015-03-01 09:10:02 +0200525 }
526
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300527 mutex_unlock(&local->sta_mtx);
Arik Nemtsovfb28ec02015-03-01 09:10:02 +0200528
Arik Nemtsovf09a87d2014-07-17 17:14:20 +0300529 /* add any remaining IEs */
530 if (extra_ies_len) {
531 noffset = extra_ies_len;
532 pos = skb_put(skb, noffset - offset);
533 memcpy(pos, extra_ies + offset, noffset - offset);
534 }
Arik Nemtsov1606ef42014-07-17 17:14:21 +0300535
Arik Nemtsovf09a87d2014-07-17 17:14:20 +0300536}
537
Arik Nemtsov6f7eaa42014-07-17 17:14:24 +0300538static void
539ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
540 struct sk_buff *skb, const u8 *peer,
541 bool initiator, const u8 *extra_ies,
542 size_t extra_ies_len)
543{
544 struct ieee80211_local *local = sdata->local;
Arik Nemtsov13cc8a42014-07-17 17:14:26 +0300545 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
Arik Nemtsov6f7eaa42014-07-17 17:14:24 +0300546 size_t offset = 0, noffset;
Arik Nemtsov13cc8a42014-07-17 17:14:26 +0300547 struct sta_info *sta, *ap_sta;
Johannes Berg57fbcce2016-04-12 15:56:15 +0200548 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
Arik Nemtsov6f7eaa42014-07-17 17:14:24 +0300549 u8 *pos;
550
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300551 mutex_lock(&local->sta_mtx);
Arik Nemtsov6f7eaa42014-07-17 17:14:24 +0300552
553 sta = sta_info_get(sdata, peer);
Arik Nemtsov13cc8a42014-07-17 17:14:26 +0300554 ap_sta = sta_info_get(sdata, ifmgd->bssid);
555 if (WARN_ON_ONCE(!sta || !ap_sta)) {
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300556 mutex_unlock(&local->sta_mtx);
Arik Nemtsov6f7eaa42014-07-17 17:14:24 +0300557 return;
558 }
559
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300560 sta->tdls_chandef = sdata->vif.bss_conf.chandef;
561
Arik Nemtsov6f7eaa42014-07-17 17:14:24 +0300562 /* add any custom IEs that go before the QoS IE */
563 if (extra_ies_len) {
564 static const u8 before_qos[] = {
565 WLAN_EID_RSN,
566 };
567 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
568 before_qos,
569 ARRAY_SIZE(before_qos),
570 offset);
571 pos = skb_put(skb, noffset - offset);
572 memcpy(pos, extra_ies + offset, noffset - offset);
573 offset = noffset;
574 }
575
576 /* add the QoS param IE if both the peer and we support it */
Johannes Berga74a8c82014-07-22 14:50:47 +0200577 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
Arik Nemtsov6f7eaa42014-07-17 17:14:24 +0300578 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
579
Arik Nemtsov13cc8a42014-07-17 17:14:26 +0300580 /* add any custom IEs that go before HT operation */
581 if (extra_ies_len) {
582 static const u8 before_ht_op[] = {
583 WLAN_EID_RSN,
584 WLAN_EID_QOS_CAPA,
585 WLAN_EID_FAST_BSS_TRANSITION,
586 WLAN_EID_TIMEOUT_INTERVAL,
587 };
588 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
589 before_ht_op,
590 ARRAY_SIZE(before_ht_op),
591 offset);
592 pos = skb_put(skb, noffset - offset);
593 memcpy(pos, extra_ies + offset, noffset - offset);
594 offset = noffset;
595 }
596
Arik Nemtsov57f255f2015-10-25 10:59:34 +0200597 /*
598 * if HT support is only added in TDLS, we need an HT-operation IE.
599 * add the IE as required by IEEE802.11-2012 9.23.3.2.
600 */
Arik Nemtsov13cc8a42014-07-17 17:14:26 +0300601 if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) {
Arik Nemtsov57f255f2015-10-25 10:59:34 +0200602 u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
603 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
604 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
605
Arik Nemtsov890b7872015-05-07 15:30:41 +0300606 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
Arik Nemtsov890b7872015-05-07 15:30:41 +0300607 ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap,
Arik Nemtsov57f255f2015-10-25 10:59:34 +0200608 &sdata->vif.bss_conf.chandef, prot,
609 true);
Arik Nemtsov13cc8a42014-07-17 17:14:26 +0300610 }
611
Arik Nemtsovfb28ec02015-03-01 09:10:02 +0200612 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
613
614 /* only include VHT-operation if not on the 2.4GHz band */
Johannes Berg57fbcce2016-04-12 15:56:15 +0200615 if (band != NL80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) {
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300616 /*
617 * if both peers support WIDER_BW, we can expand the chandef to
618 * a wider compatible one, up to 80MHz
619 */
620 if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
621 ieee80211_tdls_chandef_vht_upgrade(sdata, sta);
622
Arik Nemtsov890b7872015-05-07 15:30:41 +0300623 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
624 ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap,
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300625 &sta->tdls_chandef);
Arik Nemtsovfb28ec02015-03-01 09:10:02 +0200626 }
627
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +0300628 mutex_unlock(&local->sta_mtx);
Arik Nemtsov13cc8a42014-07-17 17:14:26 +0300629
Arik Nemtsov6f7eaa42014-07-17 17:14:24 +0300630 /* add any remaining IEs */
631 if (extra_ies_len) {
632 noffset = extra_ies_len;
633 pos = skb_put(skb, noffset - offset);
634 memcpy(pos, extra_ies + offset, noffset - offset);
635 }
Arik Nemtsov6f7eaa42014-07-17 17:14:24 +0300636}
637
Arik Nemtsova7a6bdd2014-11-09 18:50:19 +0200638static void
639ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
640 struct sk_buff *skb, const u8 *peer,
641 bool initiator, const u8 *extra_ies,
642 size_t extra_ies_len, u8 oper_class,
643 struct cfg80211_chan_def *chandef)
644{
645 struct ieee80211_tdls_data *tf;
646 size_t offset = 0, noffset;
647 u8 *pos;
648
649 if (WARN_ON_ONCE(!chandef))
650 return;
651
652 tf = (void *)skb->data;
653 tf->u.chan_switch_req.target_channel =
654 ieee80211_frequency_to_channel(chandef->chan->center_freq);
655 tf->u.chan_switch_req.oper_class = oper_class;
656
657 if (extra_ies_len) {
658 static const u8 before_lnkie[] = {
659 WLAN_EID_SECONDARY_CHANNEL_OFFSET,
660 };
661 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
662 before_lnkie,
663 ARRAY_SIZE(before_lnkie),
664 offset);
665 pos = skb_put(skb, noffset - offset);
666 memcpy(pos, extra_ies + offset, noffset - offset);
667 offset = noffset;
668 }
669
670 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
671
672 /* add any remaining IEs */
673 if (extra_ies_len) {
674 noffset = extra_ies_len;
675 pos = skb_put(skb, noffset - offset);
676 memcpy(pos, extra_ies + offset, noffset - offset);
677 }
678}
679
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +0200680static void
681ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
682 struct sk_buff *skb, const u8 *peer,
683 u16 status_code, bool initiator,
684 const u8 *extra_ies,
685 size_t extra_ies_len)
686{
687 if (status_code == 0)
688 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
689
690 if (extra_ies_len)
691 memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
692}
693
Arik Nemtsov46792a22014-07-17 17:14:19 +0300694static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
695 struct sk_buff *skb, const u8 *peer,
Arik Nemtsov1606ef42014-07-17 17:14:21 +0300696 u8 action_code, u16 status_code,
697 bool initiator, const u8 *extra_ies,
Arik Nemtsovc2733902014-11-09 18:50:16 +0200698 size_t extra_ies_len, u8 oper_class,
699 struct cfg80211_chan_def *chandef)
Arik Nemtsov46792a22014-07-17 17:14:19 +0300700{
Arik Nemtsov46792a22014-07-17 17:14:19 +0300701 switch (action_code) {
702 case WLAN_TDLS_SETUP_REQUEST:
703 case WLAN_TDLS_SETUP_RESPONSE:
704 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
Arik Nemtsov1606ef42014-07-17 17:14:21 +0300705 if (status_code == 0)
706 ieee80211_tdls_add_setup_start_ies(sdata, skb, peer,
707 action_code,
708 initiator,
709 extra_ies,
710 extra_ies_len);
Arik Nemtsov46792a22014-07-17 17:14:19 +0300711 break;
712 case WLAN_TDLS_SETUP_CONFIRM:
Arik Nemtsov6f7eaa42014-07-17 17:14:24 +0300713 if (status_code == 0)
714 ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer,
715 initiator, extra_ies,
716 extra_ies_len);
717 break;
Arik Nemtsov46792a22014-07-17 17:14:19 +0300718 case WLAN_TDLS_TEARDOWN:
719 case WLAN_TDLS_DISCOVERY_REQUEST:
Arik Nemtsovf09a87d2014-07-17 17:14:20 +0300720 if (extra_ies_len)
721 memcpy(skb_put(skb, extra_ies_len), extra_ies,
722 extra_ies_len);
Arik Nemtsov1606ef42014-07-17 17:14:21 +0300723 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
724 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
Arik Nemtsov46792a22014-07-17 17:14:19 +0300725 break;
Arik Nemtsova7a6bdd2014-11-09 18:50:19 +0200726 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
727 ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
728 initiator, extra_ies,
729 extra_ies_len,
730 oper_class, chandef);
731 break;
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +0200732 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
733 ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
734 status_code,
735 initiator, extra_ies,
736 extra_ies_len);
737 break;
Arik Nemtsov46792a22014-07-17 17:14:19 +0300738 }
739
Arik Nemtsov46792a22014-07-17 17:14:19 +0300740}
741
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300742static int
743ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
Johannes Berg3b3a0162014-05-19 17:19:31 +0200744 const u8 *peer, u8 action_code, u8 dialog_token,
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300745 u16 status_code, struct sk_buff *skb)
746{
747 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300748 struct ieee80211_tdls_data *tf;
749
750 tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
751
752 memcpy(tf->da, peer, ETH_ALEN);
753 memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
754 tf->ether_type = cpu_to_be16(ETH_P_TDLS);
755 tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
756
Arik Nemtsov59cd85c2014-09-09 17:11:02 +0300757 /* network header is after the ethernet header */
758 skb_set_network_header(skb, ETH_HLEN);
759
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300760 switch (action_code) {
761 case WLAN_TDLS_SETUP_REQUEST:
762 tf->category = WLAN_CATEGORY_TDLS;
763 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
764
765 skb_put(skb, sizeof(tf->u.setup_req));
766 tf->u.setup_req.dialog_token = dialog_token;
767 tf->u.setup_req.capability =
Arik Nemtsovdd8c0b02014-07-17 17:14:22 +0300768 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
769 status_code));
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300770 break;
771 case WLAN_TDLS_SETUP_RESPONSE:
772 tf->category = WLAN_CATEGORY_TDLS;
773 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
774
775 skb_put(skb, sizeof(tf->u.setup_resp));
776 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
777 tf->u.setup_resp.dialog_token = dialog_token;
778 tf->u.setup_resp.capability =
Arik Nemtsovdd8c0b02014-07-17 17:14:22 +0300779 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
780 status_code));
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300781 break;
782 case WLAN_TDLS_SETUP_CONFIRM:
783 tf->category = WLAN_CATEGORY_TDLS;
784 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
785
786 skb_put(skb, sizeof(tf->u.setup_cfm));
787 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
788 tf->u.setup_cfm.dialog_token = dialog_token;
789 break;
790 case WLAN_TDLS_TEARDOWN:
791 tf->category = WLAN_CATEGORY_TDLS;
792 tf->action_code = WLAN_TDLS_TEARDOWN;
793
794 skb_put(skb, sizeof(tf->u.teardown));
795 tf->u.teardown.reason_code = cpu_to_le16(status_code);
796 break;
797 case WLAN_TDLS_DISCOVERY_REQUEST:
798 tf->category = WLAN_CATEGORY_TDLS;
799 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
800
801 skb_put(skb, sizeof(tf->u.discover_req));
802 tf->u.discover_req.dialog_token = dialog_token;
803 break;
Arik Nemtsova7a6bdd2014-11-09 18:50:19 +0200804 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
805 tf->category = WLAN_CATEGORY_TDLS;
806 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
807
808 skb_put(skb, sizeof(tf->u.chan_switch_req));
809 break;
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +0200810 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
811 tf->category = WLAN_CATEGORY_TDLS;
812 tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
813
814 skb_put(skb, sizeof(tf->u.chan_switch_resp));
815 tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
816 break;
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300817 default:
818 return -EINVAL;
819 }
820
821 return 0;
822}
823
824static int
825ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
Johannes Berg3b3a0162014-05-19 17:19:31 +0200826 const u8 *peer, u8 action_code, u8 dialog_token,
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300827 u16 status_code, struct sk_buff *skb)
828{
829 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300830 struct ieee80211_mgmt *mgmt;
831
832 mgmt = (void *)skb_put(skb, 24);
833 memset(mgmt, 0, 24);
834 memcpy(mgmt->da, peer, ETH_ALEN);
835 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
836 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
837
838 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
839 IEEE80211_STYPE_ACTION);
840
841 switch (action_code) {
842 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
843 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
844 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
845 mgmt->u.action.u.tdls_discover_resp.action_code =
846 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
847 mgmt->u.action.u.tdls_discover_resp.dialog_token =
848 dialog_token;
849 mgmt->u.action.u.tdls_discover_resp.capability =
Arik Nemtsovdd8c0b02014-07-17 17:14:22 +0300850 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
851 status_code));
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300852 break;
853 default:
854 return -EINVAL;
855 }
856
857 return 0;
858}
859
Arik Nemtsovc2733902014-11-09 18:50:16 +0200860static struct sk_buff *
861ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
862 const u8 *peer, u8 action_code,
863 u8 dialog_token, u16 status_code,
864 bool initiator, const u8 *extra_ies,
865 size_t extra_ies_len, u8 oper_class,
866 struct cfg80211_chan_def *chandef)
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300867{
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300868 struct ieee80211_local *local = sdata->local;
Arik Nemtsovc2733902014-11-09 18:50:16 +0200869 struct sk_buff *skb;
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300870 int ret;
871
Arik Nemtsovc2733902014-11-09 18:50:16 +0200872 skb = netdev_alloc_skb(sdata->dev,
Liad Kaufman1277b4a2014-11-09 18:50:08 +0200873 local->hw.extra_tx_headroom +
874 max(sizeof(struct ieee80211_mgmt),
875 sizeof(struct ieee80211_tdls_data)) +
876 50 + /* supported rates */
Arik Nemtsovb98fb442015-06-10 20:42:59 +0300877 10 + /* ext capab */
Liad Kaufman1277b4a2014-11-09 18:50:08 +0200878 26 + /* max(WMM-info, WMM-param) */
879 2 + max(sizeof(struct ieee80211_ht_cap),
880 sizeof(struct ieee80211_ht_operation)) +
Arik Nemtsovfb28ec02015-03-01 09:10:02 +0200881 2 + max(sizeof(struct ieee80211_vht_cap),
882 sizeof(struct ieee80211_vht_operation)) +
Arik Nemtsovf0d29cb2014-11-09 18:50:12 +0200883 50 + /* supported channels */
Arik Nemtsov2cedd872014-11-09 18:50:13 +0200884 3 + /* 40/20 BSS coex */
Arik Nemtsovfb28ec02015-03-01 09:10:02 +0200885 4 + /* AID */
Arik Nemtsova38700d2015-03-18 08:46:08 +0200886 4 + /* oper classes */
Liad Kaufman1277b4a2014-11-09 18:50:08 +0200887 extra_ies_len +
888 sizeof(struct ieee80211_tdls_lnkie));
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300889 if (!skb)
Arik Nemtsovc2733902014-11-09 18:50:16 +0200890 return NULL;
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300891
892 skb_reserve(skb, local->hw.extra_tx_headroom);
893
894 switch (action_code) {
895 case WLAN_TDLS_SETUP_REQUEST:
896 case WLAN_TDLS_SETUP_RESPONSE:
897 case WLAN_TDLS_SETUP_CONFIRM:
898 case WLAN_TDLS_TEARDOWN:
899 case WLAN_TDLS_DISCOVERY_REQUEST:
Arik Nemtsova7a6bdd2014-11-09 18:50:19 +0200900 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +0200901 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
Arik Nemtsovc2733902014-11-09 18:50:16 +0200902 ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
903 sdata->dev, peer,
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300904 action_code, dialog_token,
905 status_code, skb);
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300906 break;
907 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
Arik Nemtsovc2733902014-11-09 18:50:16 +0200908 ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev,
909 peer, action_code,
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300910 dialog_token, status_code,
911 skb);
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300912 break;
913 default:
914 ret = -ENOTSUPP;
915 break;
916 }
917
918 if (ret < 0)
919 goto fail;
920
Arik Nemtsovc2733902014-11-09 18:50:16 +0200921 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
922 initiator, extra_ies, extra_ies_len, oper_class,
923 chandef);
924 return skb;
925
926fail:
927 dev_kfree_skb(skb);
928 return NULL;
929}
930
931static int
932ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
933 const u8 *peer, u8 action_code, u8 dialog_token,
934 u16 status_code, u32 peer_capability,
935 bool initiator, const u8 *extra_ies,
936 size_t extra_ies_len, u8 oper_class,
937 struct cfg80211_chan_def *chandef)
938{
939 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
940 struct sk_buff *skb = NULL;
941 struct sta_info *sta;
942 u32 flags = 0;
943 int ret = 0;
944
Arik Nemtsov626911c2014-07-17 17:14:17 +0300945 rcu_read_lock();
946 sta = sta_info_get(sdata, peer);
947
948 /* infer the initiator if we can, to support old userspace */
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300949 switch (action_code) {
950 case WLAN_TDLS_SETUP_REQUEST:
Arik Nemtsov8b941482014-10-22 12:32:48 +0300951 if (sta) {
Arik Nemtsov626911c2014-07-17 17:14:17 +0300952 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
Arik Nemtsov8b941482014-10-22 12:32:48 +0300953 sta->sta.tdls_initiator = false;
954 }
Arik Nemtsov626911c2014-07-17 17:14:17 +0300955 /* fall-through */
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300956 case WLAN_TDLS_SETUP_CONFIRM:
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300957 case WLAN_TDLS_DISCOVERY_REQUEST:
Arik Nemtsov626911c2014-07-17 17:14:17 +0300958 initiator = true;
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300959 break;
960 case WLAN_TDLS_SETUP_RESPONSE:
Arik Nemtsov626911c2014-07-17 17:14:17 +0300961 /*
962 * In some testing scenarios, we send a request and response.
963 * Make the last packet sent take effect for the initiator
964 * value.
965 */
Arik Nemtsov8b941482014-10-22 12:32:48 +0300966 if (sta) {
Arik Nemtsov626911c2014-07-17 17:14:17 +0300967 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
Arik Nemtsov8b941482014-10-22 12:32:48 +0300968 sta->sta.tdls_initiator = true;
969 }
Arik Nemtsov626911c2014-07-17 17:14:17 +0300970 /* fall-through */
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300971 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
Arik Nemtsov626911c2014-07-17 17:14:17 +0300972 initiator = false;
Arik Nemtsov2fb6b9b2014-06-11 17:18:22 +0300973 break;
974 case WLAN_TDLS_TEARDOWN:
Arik Nemtsova7a6bdd2014-11-09 18:50:19 +0200975 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +0200976 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
Arik Nemtsov2fb6b9b2014-06-11 17:18:22 +0300977 /* any value is ok */
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300978 break;
979 default:
980 ret = -ENOTSUPP;
Arik Nemtsov626911c2014-07-17 17:14:17 +0300981 break;
Arik Nemtsov95224fe2014-05-01 10:17:28 +0300982 }
983
Arik Nemtsov46792a22014-07-17 17:14:19 +0300984 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
985 initiator = true;
Arik Nemtsov2fb6b9b2014-06-11 17:18:22 +0300986
Arik Nemtsov626911c2014-07-17 17:14:17 +0300987 rcu_read_unlock();
988 if (ret < 0)
989 goto fail;
990
Arik Nemtsovc2733902014-11-09 18:50:16 +0200991 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code,
992 dialog_token, status_code,
993 initiator, extra_ies,
994 extra_ies_len, oper_class,
995 chandef);
996 if (!skb) {
997 ret = -EINVAL;
998 goto fail;
999 }
1000
1001 if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
Arik Nemtsov95224fe2014-05-01 10:17:28 +03001002 ieee80211_tx_skb(sdata, skb);
1003 return 0;
1004 }
1005
1006 /*
1007 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
1008 * we should default to AC_VI.
1009 */
1010 switch (action_code) {
1011 case WLAN_TDLS_SETUP_REQUEST:
1012 case WLAN_TDLS_SETUP_RESPONSE:
1013 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
1014 skb->priority = 2;
1015 break;
1016 default:
1017 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
1018 skb->priority = 5;
1019 break;
1020 }
1021
Liad Kaufman1277b4a2014-11-09 18:50:08 +02001022 /*
1023 * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress.
1024 * Later, if no ACK is returned from peer, we will re-send the teardown
1025 * packet through the AP.
1026 */
1027 if ((action_code == WLAN_TDLS_TEARDOWN) &&
Johannes Berg30686bf2015-06-02 21:39:54 +02001028 ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
Liad Kaufman1277b4a2014-11-09 18:50:08 +02001029 bool try_resend; /* Should we keep skb for possible resend */
1030
1031 /* If not sending directly to peer - no point in keeping skb */
1032 rcu_read_lock();
1033 sta = sta_info_get(sdata, peer);
1034 try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1035 rcu_read_unlock();
1036
1037 spin_lock_bh(&sdata->u.mgd.teardown_lock);
1038 if (try_resend && !sdata->u.mgd.teardown_skb) {
1039 /* Mark it as requiring TX status callback */
1040 flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
1041 IEEE80211_TX_INTFL_MLME_CONN_TX;
1042
1043 /*
1044 * skb is copied since mac80211 will later set
1045 * properties that might not be the same as the AP,
1046 * such as encryption, QoS, addresses, etc.
1047 *
1048 * No problem if skb_copy() fails, so no need to check.
1049 */
1050 sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC);
1051 sdata->u.mgd.orig_teardown_skb = skb;
1052 }
1053 spin_unlock_bh(&sdata->u.mgd.teardown_lock);
1054 }
1055
Arik Nemtsov95224fe2014-05-01 10:17:28 +03001056 /* disable bottom halves when entering the Tx path */
1057 local_bh_disable();
Liad Kaufman1277b4a2014-11-09 18:50:08 +02001058 __ieee80211_subif_start_xmit(skb, dev, flags);
Arik Nemtsov95224fe2014-05-01 10:17:28 +03001059 local_bh_enable();
1060
1061 return ret;
1062
1063fail:
1064 dev_kfree_skb(skb);
1065 return ret;
1066}
1067
Arik Nemtsov191dd462014-06-11 17:18:23 +03001068static int
1069ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
1070 const u8 *peer, u8 action_code, u8 dialog_token,
1071 u16 status_code, u32 peer_capability, bool initiator,
1072 const u8 *extra_ies, size_t extra_ies_len)
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001073{
1074 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1075 struct ieee80211_local *local = sdata->local;
Arik Nemtsovd51c2ea2015-06-14 16:53:46 +03001076 enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode;
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001077 int ret;
1078
Arik Nemtsovd51c2ea2015-06-14 16:53:46 +03001079 /* don't support setup with forced SMPS mode that's not off */
1080 if (smps_mode != IEEE80211_SMPS_AUTOMATIC &&
1081 smps_mode != IEEE80211_SMPS_OFF) {
1082 tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n",
1083 smps_mode);
1084 return -ENOTSUPP;
1085 }
1086
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001087 mutex_lock(&local->mtx);
1088
1089 /* we don't support concurrent TDLS peer setups */
Arik Nemtsov81dd2b82014-07-17 17:14:25 +03001090 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
1091 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001092 ret = -EBUSY;
Arik Nemtsovae2e9fb2015-03-01 09:10:09 +02001093 goto out_unlock;
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001094 }
1095
Arik Nemtsov7adc3e42014-06-11 17:18:26 +03001096 /*
1097 * make sure we have a STA representing the peer so we drop or buffer
1098 * non-TDLS-setup frames to the peer. We can't send other packets
Arik Nemtsov6ae32e52014-07-17 17:14:18 +03001099 * during setup through the AP path.
1100 * Allow error packets to be sent - sometimes we don't even add a STA
1101 * before failing the setup.
Arik Nemtsov7adc3e42014-06-11 17:18:26 +03001102 */
Arik Nemtsov6ae32e52014-07-17 17:14:18 +03001103 if (status_code == 0) {
1104 rcu_read_lock();
1105 if (!sta_info_get(sdata, peer)) {
1106 rcu_read_unlock();
1107 ret = -ENOLINK;
Arik Nemtsovae2e9fb2015-03-01 09:10:09 +02001108 goto out_unlock;
Arik Nemtsov6ae32e52014-07-17 17:14:18 +03001109 }
Arik Nemtsov7adc3e42014-06-11 17:18:26 +03001110 rcu_read_unlock();
Arik Nemtsov7adc3e42014-06-11 17:18:26 +03001111 }
Arik Nemtsov7adc3e42014-06-11 17:18:26 +03001112
Emmanuel Grumbach3b24f4c2015-01-07 15:42:39 +02001113 ieee80211_flush_queues(local, sdata, false);
Arik Nemtsovae2e9fb2015-03-01 09:10:09 +02001114 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
1115 mutex_unlock(&local->mtx);
Arik Nemtsovdb67d662014-06-11 17:18:24 +03001116
Arik Nemtsovae2e9fb2015-03-01 09:10:09 +02001117 /* we cannot take the mutex while preparing the setup packet */
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001118 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1119 dialog_token, status_code,
Arik Nemtsov2fb6b9b2014-06-11 17:18:22 +03001120 peer_capability, initiator,
Arik Nemtsovc2733902014-11-09 18:50:16 +02001121 extra_ies, extra_ies_len, 0,
1122 NULL);
Arik Nemtsovae2e9fb2015-03-01 09:10:09 +02001123 if (ret < 0) {
1124 mutex_lock(&local->mtx);
1125 eth_zero_addr(sdata->u.mgd.tdls_peer);
1126 mutex_unlock(&local->mtx);
1127 return ret;
1128 }
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001129
Arik Nemtsov191dd462014-06-11 17:18:23 +03001130 ieee80211_queue_delayed_work(&sdata->local->hw,
Arik Nemtsov81dd2b82014-07-17 17:14:25 +03001131 &sdata->u.mgd.tdls_peer_del_work,
Arik Nemtsov191dd462014-06-11 17:18:23 +03001132 TDLS_PEER_SETUP_TIMEOUT);
Arik Nemtsovae2e9fb2015-03-01 09:10:09 +02001133 return 0;
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001134
Arik Nemtsovae2e9fb2015-03-01 09:10:09 +02001135out_unlock:
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001136 mutex_unlock(&local->mtx);
Arik Nemtsov191dd462014-06-11 17:18:23 +03001137 return ret;
1138}
1139
Arik Nemtsovdb67d662014-06-11 17:18:24 +03001140static int
1141ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
1142 const u8 *peer, u8 action_code, u8 dialog_token,
1143 u16 status_code, u32 peer_capability,
1144 bool initiator, const u8 *extra_ies,
1145 size_t extra_ies_len)
1146{
1147 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1148 struct ieee80211_local *local = sdata->local;
1149 struct sta_info *sta;
1150 int ret;
1151
1152 /*
1153 * No packets can be transmitted to the peer via the AP during setup -
1154 * the STA is set as a TDLS peer, but is not authorized.
1155 * During teardown, we prevent direct transmissions by stopping the
1156 * queues and flushing all direct packets.
1157 */
1158 ieee80211_stop_vif_queues(local, sdata,
1159 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
Emmanuel Grumbach3b24f4c2015-01-07 15:42:39 +02001160 ieee80211_flush_queues(local, sdata, false);
Arik Nemtsovdb67d662014-06-11 17:18:24 +03001161
1162 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
1163 dialog_token, status_code,
1164 peer_capability, initiator,
Arik Nemtsovc2733902014-11-09 18:50:16 +02001165 extra_ies, extra_ies_len, 0,
1166 NULL);
Arik Nemtsovdb67d662014-06-11 17:18:24 +03001167 if (ret < 0)
1168 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
1169 ret);
1170
1171 /*
1172 * Remove the STA AUTH flag to force further traffic through the AP. If
1173 * the STA was unreachable, it was already removed.
1174 */
1175 rcu_read_lock();
1176 sta = sta_info_get(sdata, peer);
1177 if (sta)
1178 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
1179 rcu_read_unlock();
1180
1181 ieee80211_wake_vif_queues(local, sdata,
1182 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
1183
1184 return 0;
1185}
1186
Arik Nemtsov191dd462014-06-11 17:18:23 +03001187int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
1188 const u8 *peer, u8 action_code, u8 dialog_token,
1189 u16 status_code, u32 peer_capability,
1190 bool initiator, const u8 *extra_ies,
1191 size_t extra_ies_len)
1192{
1193 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1194 int ret;
1195
1196 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1197 return -ENOTSUPP;
1198
1199 /* make sure we are in managed mode, and associated */
1200 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1201 !sdata->u.mgd.associated)
1202 return -EINVAL;
1203
1204 switch (action_code) {
1205 case WLAN_TDLS_SETUP_REQUEST:
1206 case WLAN_TDLS_SETUP_RESPONSE:
1207 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
1208 dialog_token, status_code,
1209 peer_capability, initiator,
1210 extra_ies, extra_ies_len);
1211 break;
1212 case WLAN_TDLS_TEARDOWN:
Arik Nemtsovdb67d662014-06-11 17:18:24 +03001213 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
1214 action_code, dialog_token,
1215 status_code,
1216 peer_capability, initiator,
1217 extra_ies, extra_ies_len);
1218 break;
Arik Nemtsov191dd462014-06-11 17:18:23 +03001219 case WLAN_TDLS_DISCOVERY_REQUEST:
Arik Nemtsovee10f2c2014-06-11 17:18:27 +03001220 /*
1221 * Protect the discovery so we can hear the TDLS discovery
1222 * response frame. It is transmitted directly and not buffered
1223 * by the AP.
1224 */
1225 drv_mgd_protect_tdls_discover(sdata->local, sdata);
1226 /* fall-through */
1227 case WLAN_TDLS_SETUP_CONFIRM:
Arik Nemtsov191dd462014-06-11 17:18:23 +03001228 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
1229 /* no special handling */
1230 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
1231 action_code,
1232 dialog_token,
1233 status_code,
1234 peer_capability,
1235 initiator, extra_ies,
Arik Nemtsovc2733902014-11-09 18:50:16 +02001236 extra_ies_len, 0, NULL);
Arik Nemtsov191dd462014-06-11 17:18:23 +03001237 break;
1238 default:
1239 ret = -EOPNOTSUPP;
1240 break;
1241 }
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001242
1243 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
1244 action_code, peer, ret);
1245 return ret;
1246}
1247
Arik Nemtsov59021c62016-03-02 23:28:32 +02001248static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata,
1249 struct sta_info *sta)
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +03001250{
1251 struct ieee80211_local *local = sdata->local;
1252 struct ieee80211_chanctx_conf *conf;
1253 struct ieee80211_chanctx *ctx;
Arik Nemtsov59021c62016-03-02 23:28:32 +02001254 enum nl80211_chan_width width;
1255 struct ieee80211_supported_band *sband;
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +03001256
1257 mutex_lock(&local->chanctx_mtx);
1258 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1259 lockdep_is_held(&local->chanctx_mtx));
1260 if (conf) {
Arik Nemtsov59021c62016-03-02 23:28:32 +02001261 width = conf->def.width;
1262 sband = local->hw.wiphy->bands[conf->def.chan->band];
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +03001263 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1264 ieee80211_recalc_chanctx_chantype(local, ctx);
Arik Nemtsov59021c62016-03-02 23:28:32 +02001265
1266 /* if width changed and a peer is given, update its BW */
1267 if (width != conf->def.width && sta &&
1268 test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) {
1269 enum ieee80211_sta_rx_bandwidth bw;
1270
1271 bw = ieee80211_chan_width_to_rx_bw(conf->def.width);
1272 bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
1273 if (bw != sta->sta.bandwidth) {
1274 sta->sta.bandwidth = bw;
1275 rate_control_rate_update(local, sband, sta,
1276 IEEE80211_RC_BW_CHANGED);
1277 /*
1278 * if a TDLS peer BW was updated, we need to
1279 * recalc the chandef width again, to get the
1280 * correct chanctx min_def
1281 */
1282 ieee80211_recalc_chanctx_chantype(local, ctx);
1283 }
1284 }
1285
Arik Nemtsov0fabfaa2015-06-10 20:41:23 +03001286 }
1287 mutex_unlock(&local->chanctx_mtx);
1288}
1289
Avri Altman22f66892015-08-18 16:52:07 +03001290static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata)
1291{
1292 struct sta_info *sta;
1293 bool result = false;
1294
1295 rcu_read_lock();
1296 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1297 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1298 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
1299 !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) ||
1300 !sta->sta.ht_cap.ht_supported)
1301 continue;
1302 result = true;
1303 break;
1304 }
1305 rcu_read_unlock();
1306
1307 return result;
1308}
1309
1310static void
1311iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata,
1312 struct sta_info *sta)
1313{
1314 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1315 bool tdls_ht;
1316 u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
1317 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
1318 IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT;
1319 u16 opmode;
1320
1321 /* Nothing to do if the BSS connection uses HT */
1322 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
1323 return;
1324
1325 tdls_ht = (sta && sta->sta.ht_cap.ht_supported) ||
1326 iee80211_tdls_have_ht_peers(sdata);
1327
1328 opmode = sdata->vif.bss_conf.ht_operation_mode;
1329
1330 if (tdls_ht)
1331 opmode |= protection;
1332 else
1333 opmode &= ~protection;
1334
1335 if (opmode == sdata->vif.bss_conf.ht_operation_mode)
1336 return;
1337
1338 sdata->vif.bss_conf.ht_operation_mode = opmode;
1339 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
1340}
1341
Arik Nemtsov95224fe2014-05-01 10:17:28 +03001342int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
Johannes Berg3b3a0162014-05-19 17:19:31 +02001343 const u8 *peer, enum nl80211_tdls_operation oper)
Arik Nemtsov95224fe2014-05-01 10:17:28 +03001344{
1345 struct sta_info *sta;
1346 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001347 struct ieee80211_local *local = sdata->local;
1348 int ret;
Arik Nemtsov95224fe2014-05-01 10:17:28 +03001349
1350 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
1351 return -ENOTSUPP;
1352
1353 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1354 return -EINVAL;
1355
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001356 switch (oper) {
1357 case NL80211_TDLS_ENABLE_LINK:
1358 case NL80211_TDLS_DISABLE_LINK:
1359 break;
1360 case NL80211_TDLS_TEARDOWN:
1361 case NL80211_TDLS_SETUP:
1362 case NL80211_TDLS_DISCOVERY_REQ:
1363 /* We don't support in-driver setup/teardown/discovery */
1364 return -ENOTSUPP;
1365 }
1366
Avri Altman22f66892015-08-18 16:52:07 +03001367 /* protect possible bss_conf changes and avoid concurrency in
1368 * ieee80211_bss_info_change_notify()
1369 */
1370 sdata_lock(sdata);
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001371 mutex_lock(&local->mtx);
Arik Nemtsov95224fe2014-05-01 10:17:28 +03001372 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
1373
1374 switch (oper) {
1375 case NL80211_TDLS_ENABLE_LINK:
Arik Nemtsovc5a71682015-05-19 14:36:48 +03001376 if (sdata->vif.csa_active) {
1377 tdls_dbg(sdata, "TDLS: disallow link during CSA\n");
1378 ret = -EBUSY;
1379 break;
1380 }
1381
Avri Altman22f66892015-08-18 16:52:07 +03001382 mutex_lock(&local->sta_mtx);
Arik Nemtsov95224fe2014-05-01 10:17:28 +03001383 sta = sta_info_get(sdata, peer);
1384 if (!sta) {
Avri Altman22f66892015-08-18 16:52:07 +03001385 mutex_unlock(&local->sta_mtx);
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001386 ret = -ENOLINK;
1387 break;
Arik Nemtsov95224fe2014-05-01 10:17:28 +03001388 }
1389
Arik Nemtsov59021c62016-03-02 23:28:32 +02001390 iee80211_tdls_recalc_chanctx(sdata, sta);
Avri Altman22f66892015-08-18 16:52:07 +03001391 iee80211_tdls_recalc_ht_protection(sdata, sta);
1392
Arik Nemtsov95224fe2014-05-01 10:17:28 +03001393 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
Avri Altman22f66892015-08-18 16:52:07 +03001394 mutex_unlock(&local->sta_mtx);
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001395
Arik Nemtsov81dd2b82014-07-17 17:14:25 +03001396 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
1397 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001398 ret = 0;
Arik Nemtsov95224fe2014-05-01 10:17:28 +03001399 break;
1400 case NL80211_TDLS_DISABLE_LINK:
Liad Kaufmanbb3f8482014-07-17 17:14:31 +03001401 /*
1402 * The teardown message in ieee80211_tdls_mgmt_teardown() was
1403 * created while the queues were stopped, so it might still be
1404 * pending. Before flushing the queues we need to be sure the
1405 * message is handled by the tasklet handling pending messages,
1406 * otherwise we might start destroying the station before
1407 * sending the teardown packet.
1408 * Note that this only forces the tasklet to flush pendings -
1409 * not to stop the tasklet from rescheduling itself.
1410 */
1411 tasklet_kill(&local->tx_pending_tasklet);
Arik Nemtsovdb67d662014-06-11 17:18:24 +03001412 /* flush a potentially queued teardown packet */
Emmanuel Grumbach3b24f4c2015-01-07 15:42:39 +02001413 ieee80211_flush_queues(local, sdata, false);
Arik Nemtsovdb67d662014-06-11 17:18:24 +03001414
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001415 ret = sta_info_destroy_addr(sdata, peer);
Avri Altman22f66892015-08-18 16:52:07 +03001416
1417 mutex_lock(&local->sta_mtx);
1418 iee80211_tdls_recalc_ht_protection(sdata, NULL);
1419 mutex_unlock(&local->sta_mtx);
1420
Arik Nemtsov59021c62016-03-02 23:28:32 +02001421 iee80211_tdls_recalc_chanctx(sdata, NULL);
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001422 break;
Arik Nemtsov95224fe2014-05-01 10:17:28 +03001423 default:
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001424 ret = -ENOTSUPP;
1425 break;
Arik Nemtsov95224fe2014-05-01 10:17:28 +03001426 }
1427
Arik Nemtsov81dd2b82014-07-17 17:14:25 +03001428 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
1429 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
1430 eth_zero_addr(sdata->u.mgd.tdls_peer);
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001431 }
1432
Arik Nemtsovd51c2ea2015-06-14 16:53:46 +03001433 if (ret == 0)
1434 ieee80211_queue_work(&sdata->local->hw,
1435 &sdata->u.mgd.request_smps_work);
1436
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001437 mutex_unlock(&local->mtx);
Avri Altman22f66892015-08-18 16:52:07 +03001438 sdata_unlock(sdata);
Arik Nemtsov17e6a592014-06-11 17:18:20 +03001439 return ret;
Arik Nemtsov95224fe2014-05-01 10:17:28 +03001440}
Arik Nemtsovc887f0d32014-06-11 17:18:25 +03001441
1442void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
1443 enum nl80211_tdls_operation oper,
1444 u16 reason_code, gfp_t gfp)
1445{
1446 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1447
1448 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
1449 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
1450 oper);
1451 return;
1452 }
1453
1454 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
1455}
1456EXPORT_SYMBOL(ieee80211_tdls_oper_request);
Arik Nemtsova7a6bdd2014-11-09 18:50:19 +02001457
1458static void
1459iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
1460{
1461 struct ieee80211_ch_switch_timing *ch_sw;
1462
1463 *buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
1464 *buf++ = sizeof(struct ieee80211_ch_switch_timing);
1465
1466 ch_sw = (void *)buf;
1467 ch_sw->switch_time = cpu_to_le16(switch_time);
1468 ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
1469}
1470
1471/* find switch timing IE in SKB ready for Tx */
1472static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
1473{
1474 struct ieee80211_tdls_data *tf;
1475 const u8 *ie_start;
1476
1477 /*
1478 * Get the offset for the new location of the switch timing IE.
1479 * The SKB network header will now point to the "payload_type"
1480 * element of the TDLS data frame struct.
1481 */
1482 tf = container_of(skb->data + skb_network_offset(skb),
1483 struct ieee80211_tdls_data, payload_type);
1484 ie_start = tf->u.chan_switch_req.variable;
1485 return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
1486 skb->len - (ie_start - skb->data));
1487}
1488
1489static struct sk_buff *
1490ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
1491 struct cfg80211_chan_def *chandef,
1492 u32 *ch_sw_tm_ie_offset)
1493{
1494 struct ieee80211_sub_if_data *sdata = sta->sdata;
1495 u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
1496 2 + sizeof(struct ieee80211_ch_switch_timing)];
1497 int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
1498 u8 *pos = extra_ies;
1499 struct sk_buff *skb;
1500
1501 /*
1502 * if chandef points to a wide channel add a Secondary-Channel
1503 * Offset information element
1504 */
1505 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1506 struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
1507 bool ht40plus;
1508
1509 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
1510 *pos++ = sizeof(*sec_chan_ie);
1511 sec_chan_ie = (void *)pos;
1512
1513 ht40plus = cfg80211_get_chandef_type(chandef) ==
1514 NL80211_CHAN_HT40PLUS;
1515 sec_chan_ie->sec_chan_offs = ht40plus ?
1516 IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
1517 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1518 pos += sizeof(*sec_chan_ie);
1519
1520 extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1521 }
1522
1523 /* just set the values to 0, this is a template */
1524 iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
1525
1526 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1527 WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
1528 0, 0, !sta->sta.tdls_initiator,
1529 extra_ies, extra_ies_len,
1530 oper_class, chandef);
1531 if (!skb)
1532 return NULL;
1533
1534 skb = ieee80211_build_data_template(sdata, skb, 0);
1535 if (IS_ERR(skb)) {
1536 tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
1537 return NULL;
1538 }
1539
1540 if (ch_sw_tm_ie_offset) {
1541 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1542
1543 if (!tm_ie) {
1544 tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
1545 dev_kfree_skb_any(skb);
1546 return NULL;
1547 }
1548
1549 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1550 }
1551
1552 tdls_dbg(sdata,
1553 "TDLS channel switch request template for %pM ch %d width %d\n",
1554 sta->sta.addr, chandef->chan->center_freq, chandef->width);
1555 return skb;
1556}
1557
1558int
1559ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
1560 const u8 *addr, u8 oper_class,
1561 struct cfg80211_chan_def *chandef)
1562{
1563 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1564 struct ieee80211_local *local = sdata->local;
1565 struct sta_info *sta;
1566 struct sk_buff *skb = NULL;
1567 u32 ch_sw_tm_ie;
1568 int ret;
1569
1570 mutex_lock(&local->sta_mtx);
1571 sta = sta_info_get(sdata, addr);
1572 if (!sta) {
1573 tdls_dbg(sdata,
1574 "Invalid TDLS peer %pM for channel switch request\n",
1575 addr);
1576 ret = -ENOENT;
1577 goto out;
1578 }
1579
1580 if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
1581 tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
1582 addr);
1583 ret = -ENOTSUPP;
1584 goto out;
1585 }
1586
1587 skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
1588 &ch_sw_tm_ie);
1589 if (!skb) {
1590 ret = -ENOENT;
1591 goto out;
1592 }
1593
1594 ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
1595 chandef, skb, ch_sw_tm_ie);
1596 if (!ret)
1597 set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1598
1599out:
1600 mutex_unlock(&local->sta_mtx);
1601 dev_kfree_skb_any(skb);
1602 return ret;
1603}
1604
1605void
1606ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
1607 struct net_device *dev,
1608 const u8 *addr)
1609{
1610 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1611 struct ieee80211_local *local = sdata->local;
1612 struct sta_info *sta;
1613
1614 mutex_lock(&local->sta_mtx);
1615 sta = sta_info_get(sdata, addr);
1616 if (!sta) {
1617 tdls_dbg(sdata,
1618 "Invalid TDLS peer %pM for channel switch cancel\n",
1619 addr);
1620 goto out;
1621 }
1622
1623 if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1624 tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
1625 addr);
1626 goto out;
1627 }
1628
1629 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1630 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1631
1632out:
1633 mutex_unlock(&local->sta_mtx);
1634}
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02001635
1636static struct sk_buff *
1637ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
1638 u32 *ch_sw_tm_ie_offset)
1639{
1640 struct ieee80211_sub_if_data *sdata = sta->sdata;
1641 struct sk_buff *skb;
1642 u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
1643
1644 /* initial timing are always zero in the template */
1645 iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
1646
1647 skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
1648 WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
1649 0, 0, !sta->sta.tdls_initiator,
1650 extra_ies, sizeof(extra_ies), 0, NULL);
1651 if (!skb)
1652 return NULL;
1653
1654 skb = ieee80211_build_data_template(sdata, skb, 0);
1655 if (IS_ERR(skb)) {
1656 tdls_dbg(sdata,
1657 "Failed building TDLS channel switch resp frame\n");
1658 return NULL;
1659 }
1660
1661 if (ch_sw_tm_ie_offset) {
1662 const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
1663
1664 if (!tm_ie) {
1665 tdls_dbg(sdata,
1666 "No switch timing IE in TDLS switch resp\n");
1667 dev_kfree_skb_any(skb);
1668 return NULL;
1669 }
1670
1671 *ch_sw_tm_ie_offset = tm_ie - skb->data;
1672 }
1673
1674 tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
1675 sta->sta.addr);
1676 return skb;
1677}
1678
1679static int
1680ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
1681 struct sk_buff *skb)
1682{
1683 struct ieee80211_local *local = sdata->local;
1684 struct ieee802_11_elems elems;
1685 struct sta_info *sta;
1686 struct ieee80211_tdls_data *tf = (void *)skb->data;
1687 bool local_initiator;
1688 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1689 int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
1690 struct ieee80211_tdls_ch_sw_params params = {};
1691 int ret;
1692
1693 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
1694 params.timestamp = rx_status->device_timestamp;
1695
1696 if (skb->len < baselen) {
1697 tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
1698 skb->len);
1699 return -EINVAL;
1700 }
1701
1702 mutex_lock(&local->sta_mtx);
1703 sta = sta_info_get(sdata, tf->sa);
1704 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1705 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1706 tf->sa);
1707 ret = -EINVAL;
1708 goto out;
1709 }
1710
1711 params.sta = &sta->sta;
1712 params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
1713 if (params.status != 0) {
1714 ret = 0;
1715 goto call_drv;
1716 }
1717
1718 ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
1719 skb->len - baselen, false, &elems);
1720 if (elems.parse_error) {
1721 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
1722 ret = -EINVAL;
1723 goto out;
1724 }
1725
1726 if (!elems.ch_sw_timing || !elems.lnk_id) {
1727 tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
1728 ret = -EINVAL;
1729 goto out;
1730 }
1731
1732 /* validate the initiator is set correctly */
1733 local_initiator =
1734 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1735 if (local_initiator == sta->sta.tdls_initiator) {
1736 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1737 ret = -EINVAL;
1738 goto out;
1739 }
1740
1741 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1742 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1743
1744 params.tmpl_skb =
1745 ieee80211_tdls_ch_sw_resp_tmpl_get(sta, &params.ch_sw_tm_ie);
1746 if (!params.tmpl_skb) {
1747 ret = -ENOENT;
1748 goto out;
1749 }
1750
Dan Carpenter49708e32016-06-27 17:31:18 +03001751 ret = 0;
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02001752call_drv:
1753 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1754
1755 tdls_dbg(sdata,
1756 "TDLS channel switch response received from %pM status %d\n",
1757 tf->sa, params.status);
1758
1759out:
1760 mutex_unlock(&local->sta_mtx);
1761 dev_kfree_skb_any(params.tmpl_skb);
1762 return ret;
1763}
1764
1765static int
1766ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
1767 struct sk_buff *skb)
1768{
1769 struct ieee80211_local *local = sdata->local;
1770 struct ieee802_11_elems elems;
1771 struct cfg80211_chan_def chandef;
1772 struct ieee80211_channel *chan;
1773 enum nl80211_channel_type chan_type;
1774 int freq;
1775 u8 target_channel, oper_class;
1776 bool local_initiator;
1777 struct sta_info *sta;
Johannes Berg57fbcce2016-04-12 15:56:15 +02001778 enum nl80211_band band;
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02001779 struct ieee80211_tdls_data *tf = (void *)skb->data;
1780 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1781 int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
1782 struct ieee80211_tdls_ch_sw_params params = {};
1783 int ret = 0;
1784
1785 params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
1786 params.timestamp = rx_status->device_timestamp;
1787
1788 if (skb->len < baselen) {
1789 tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
1790 skb->len);
1791 return -EINVAL;
1792 }
1793
1794 target_channel = tf->u.chan_switch_req.target_channel;
1795 oper_class = tf->u.chan_switch_req.oper_class;
1796
1797 /*
1798 * We can't easily infer the channel band. The operating class is
1799 * ambiguous - there are multiple tables (US/Europe/JP/Global). The
1800 * solution here is to treat channels with number >14 as 5GHz ones,
1801 * and specifically check for the (oper_class, channel) combinations
1802 * where this doesn't hold. These are thankfully unique according to
1803 * IEEE802.11-2012.
1804 * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
1805 * valid here.
1806 */
1807 if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
1808 oper_class == 4 || oper_class == 5 || oper_class == 6) &&
1809 target_channel < 14)
Johannes Berg57fbcce2016-04-12 15:56:15 +02001810 band = NL80211_BAND_5GHZ;
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02001811 else
Johannes Berg57fbcce2016-04-12 15:56:15 +02001812 band = target_channel < 14 ? NL80211_BAND_2GHZ :
1813 NL80211_BAND_5GHZ;
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02001814
1815 freq = ieee80211_channel_to_frequency(target_channel, band);
1816 if (freq == 0) {
1817 tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
1818 target_channel);
1819 return -EINVAL;
1820 }
1821
1822 chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
1823 if (!chan) {
1824 tdls_dbg(sdata,
1825 "Unsupported channel for TDLS chan switch: %d\n",
1826 target_channel);
1827 return -EINVAL;
1828 }
1829
1830 ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
1831 skb->len - baselen, false, &elems);
1832 if (elems.parse_error) {
1833 tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
1834 return -EINVAL;
1835 }
1836
1837 if (!elems.ch_sw_timing || !elems.lnk_id) {
1838 tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
1839 return -EINVAL;
1840 }
1841
Arik Nemtsov42d8d782015-07-08 15:41:46 +03001842 if (!elems.sec_chan_offs) {
1843 chan_type = NL80211_CHAN_HT20;
1844 } else {
1845 switch (elems.sec_chan_offs->sec_chan_offs) {
1846 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1847 chan_type = NL80211_CHAN_HT40PLUS;
1848 break;
1849 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1850 chan_type = NL80211_CHAN_HT40MINUS;
1851 break;
1852 default:
1853 chan_type = NL80211_CHAN_HT20;
1854 break;
1855 }
1856 }
1857
1858 cfg80211_chandef_create(&chandef, chan, chan_type);
1859
1860 /* we will be active on the TDLS link */
1861 if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef,
1862 sdata->wdev.iftype)) {
1863 tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n");
1864 return -EINVAL;
1865 }
1866
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02001867 mutex_lock(&local->sta_mtx);
1868 sta = sta_info_get(sdata, tf->sa);
1869 if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
1870 tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
1871 tf->sa);
1872 ret = -EINVAL;
1873 goto out;
1874 }
1875
1876 params.sta = &sta->sta;
1877
1878 /* validate the initiator is set correctly */
1879 local_initiator =
1880 !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
1881 if (local_initiator == sta->sta.tdls_initiator) {
1882 tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
1883 ret = -EINVAL;
1884 goto out;
1885 }
1886
Arik Nemtsov42d8d782015-07-08 15:41:46 +03001887 /* peer should have known better */
1888 if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs &&
1889 elems.sec_chan_offs->sec_chan_offs) {
1890 tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n");
1891 ret = -ENOTSUPP;
1892 goto out;
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02001893 }
1894
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02001895 params.chandef = &chandef;
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02001896 params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
1897 params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
1898
1899 params.tmpl_skb =
1900 ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
1901 &params.ch_sw_tm_ie);
1902 if (!params.tmpl_skb) {
1903 ret = -ENOENT;
1904 goto out;
1905 }
1906
1907 drv_tdls_recv_channel_switch(sdata->local, sdata, &params);
1908
1909 tdls_dbg(sdata,
1910 "TDLS ch switch request received from %pM ch %d width %d\n",
1911 tf->sa, params.chandef->chan->center_freq,
1912 params.chandef->width);
1913out:
1914 mutex_unlock(&local->sta_mtx);
1915 dev_kfree_skb_any(params.tmpl_skb);
1916 return ret;
1917}
1918
Arik Nemtsovc8ff71e2015-07-08 15:41:45 +03001919static void
1920ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
1921 struct sk_buff *skb)
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02001922{
1923 struct ieee80211_tdls_data *tf = (void *)skb->data;
1924 struct wiphy *wiphy = sdata->local->hw.wiphy;
1925
Arik Nemtsovc8ff71e2015-07-08 15:41:45 +03001926 ASSERT_RTNL();
1927
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02001928 /* make sure the driver supports it */
1929 if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
1930 return;
1931
1932 /* we want to access the entire packet */
1933 if (skb_linearize(skb))
1934 return;
1935 /*
1936 * The packet/size was already validated by mac80211 Rx path, only look
1937 * at the action type.
1938 */
1939 switch (tf->action_code) {
1940 case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
1941 ieee80211_process_tdls_channel_switch_req(sdata, skb);
1942 break;
1943 case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
1944 ieee80211_process_tdls_channel_switch_resp(sdata, skb);
1945 break;
1946 default:
1947 WARN_ON_ONCE(1);
1948 return;
1949 }
1950}
Arik Nemtsovd51c2ea2015-06-14 16:53:46 +03001951
1952void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1953{
1954 struct sta_info *sta;
1955 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1956
1957 rcu_read_lock();
1958 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1959 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1960 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1961 continue;
1962
1963 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1964 NL80211_TDLS_TEARDOWN, reason,
1965 GFP_ATOMIC);
1966 }
1967 rcu_read_unlock();
1968}
Arik Nemtsovc8ff71e2015-07-08 15:41:45 +03001969
1970void ieee80211_tdls_chsw_work(struct work_struct *wk)
1971{
1972 struct ieee80211_local *local =
1973 container_of(wk, struct ieee80211_local, tdls_chsw_work);
1974 struct ieee80211_sub_if_data *sdata;
1975 struct sk_buff *skb;
1976 struct ieee80211_tdls_data *tf;
1977
1978 rtnl_lock();
1979 while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
1980 tf = (struct ieee80211_tdls_data *)skb->data;
1981 list_for_each_entry(sdata, &local->interfaces, list) {
1982 if (!ieee80211_sdata_running(sdata) ||
1983 sdata->vif.type != NL80211_IFTYPE_STATION ||
1984 !ether_addr_equal(tf->da, sdata->vif.addr))
1985 continue;
1986
1987 ieee80211_process_tdls_channel_switch(sdata, skb);
1988 break;
1989 }
1990
1991 kfree_skb(skb);
1992 }
1993 rtnl_unlock();
1994}