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Commit | Line | Data |
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95224fe8 AN |
1 | /* |
2 | * mac80211 TDLS handling code | |
3 | * | |
4 | * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> | |
5 | * Copyright 2014, Intel Corporation | |
d98ad83e | 6 | * Copyright 2014 Intel Mobile Communications GmbH |
95224fe8 AN |
7 | * |
8 | * This file is GPLv2 as found in COPYING. | |
9 | */ | |
10 | ||
11 | #include <linux/ieee80211.h> | |
6f7eaa47 | 12 | #include <linux/log2.h> |
c887f0d3 | 13 | #include <net/cfg80211.h> |
95224fe8 | 14 | #include "ieee80211_i.h" |
ee10f2c7 | 15 | #include "driver-ops.h" |
95224fe8 | 16 | |
17e6a59a AN |
17 | /* give usermode some time for retries in setting up the TDLS session */ |
18 | #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ) | |
19 | ||
20 | void ieee80211_tdls_peer_del_work(struct work_struct *wk) | |
21 | { | |
22 | struct ieee80211_sub_if_data *sdata; | |
23 | struct ieee80211_local *local; | |
24 | ||
25 | sdata = container_of(wk, struct ieee80211_sub_if_data, | |
81dd2b88 | 26 | u.mgd.tdls_peer_del_work.work); |
17e6a59a AN |
27 | local = sdata->local; |
28 | ||
29 | mutex_lock(&local->mtx); | |
81dd2b88 AN |
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); | |
17e6a59a AN |
34 | } |
35 | mutex_unlock(&local->mtx); | |
36 | } | |
37 | ||
78632a17 AN |
38 | static void ieee80211_tdls_add_ext_capab(struct ieee80211_local *local, |
39 | struct sk_buff *skb) | |
95224fe8 AN |
40 | { |
41 | u8 *pos = (void *)skb_put(skb, 7); | |
78632a17 AN |
42 | bool chan_switch = local->hw.wiphy->features & |
43 | NL80211_FEATURE_TDLS_CHANNEL_SWITCH; | |
95224fe8 AN |
44 | |
45 | *pos++ = WLAN_EID_EXT_CAPABILITY; | |
46 | *pos++ = 5; /* len */ | |
47 | *pos++ = 0x0; | |
48 | *pos++ = 0x0; | |
49 | *pos++ = 0x0; | |
78632a17 | 50 | *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0; |
95224fe8 AN |
51 | *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED; |
52 | } | |
53 | ||
f0d29cb9 AN |
54 | static u8 |
55 | ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata, | |
56 | struct sk_buff *skb, u16 start, u16 end, | |
57 | u16 spacing) | |
58 | { | |
59 | u8 subband_cnt = 0, ch_cnt = 0; | |
60 | struct ieee80211_channel *ch; | |
61 | struct cfg80211_chan_def chandef; | |
62 | int i, subband_start; | |
923b352f | 63 | struct wiphy *wiphy = sdata->local->hw.wiphy; |
f0d29cb9 AN |
64 | |
65 | for (i = start; i <= end; i += spacing) { | |
66 | if (!ch_cnt) | |
67 | subband_start = i; | |
68 | ||
69 | ch = ieee80211_get_channel(sdata->local->hw.wiphy, i); | |
70 | if (ch) { | |
71 | /* we will be active on the channel */ | |
f0d29cb9 | 72 | cfg80211_chandef_create(&chandef, ch, |
50075892 | 73 | NL80211_CHAN_NO_HT); |
923b352f AN |
74 | if (cfg80211_reg_can_beacon_relax(wiphy, &chandef, |
75 | sdata->wdev.iftype)) { | |
f0d29cb9 | 76 | ch_cnt++; |
50075892 AN |
77 | /* |
78 | * check if the next channel is also part of | |
79 | * this allowed range | |
80 | */ | |
f0d29cb9 AN |
81 | continue; |
82 | } | |
83 | } | |
84 | ||
50075892 AN |
85 | /* |
86 | * we've reached the end of a range, with allowed channels | |
87 | * found | |
88 | */ | |
f0d29cb9 AN |
89 | if (ch_cnt) { |
90 | u8 *pos = skb_put(skb, 2); | |
91 | *pos++ = ieee80211_frequency_to_channel(subband_start); | |
92 | *pos++ = ch_cnt; | |
93 | ||
94 | subband_cnt++; | |
95 | ch_cnt = 0; | |
96 | } | |
97 | } | |
98 | ||
50075892 AN |
99 | /* all channels in the requested range are allowed - add them here */ |
100 | if (ch_cnt) { | |
101 | u8 *pos = skb_put(skb, 2); | |
102 | *pos++ = ieee80211_frequency_to_channel(subband_start); | |
103 | *pos++ = ch_cnt; | |
104 | ||
105 | subband_cnt++; | |
106 | } | |
107 | ||
f0d29cb9 AN |
108 | return subband_cnt; |
109 | } | |
110 | ||
111 | static void | |
112 | ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata, | |
113 | struct sk_buff *skb) | |
114 | { | |
115 | /* | |
116 | * Add possible channels for TDLS. These are channels that are allowed | |
117 | * to be active. | |
118 | */ | |
119 | u8 subband_cnt; | |
120 | u8 *pos = skb_put(skb, 2); | |
121 | ||
122 | *pos++ = WLAN_EID_SUPPORTED_CHANNELS; | |
123 | ||
124 | /* | |
125 | * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as | |
126 | * this doesn't happen in real world scenarios. | |
127 | */ | |
128 | ||
129 | /* 2GHz, with 5MHz spacing */ | |
130 | subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5); | |
131 | ||
132 | /* 5GHz, with 20MHz spacing */ | |
133 | subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20); | |
134 | ||
135 | /* length */ | |
136 | *pos = 2 * subband_cnt; | |
137 | } | |
138 | ||
a38700dd AN |
139 | static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata, |
140 | struct sk_buff *skb) | |
141 | { | |
142 | u8 *pos; | |
143 | u8 op_class; | |
144 | ||
145 | if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef, | |
146 | &op_class)) | |
147 | return; | |
148 | ||
149 | pos = skb_put(skb, 4); | |
150 | *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES; | |
151 | *pos++ = 2; /* len */ | |
152 | ||
153 | *pos++ = op_class; | |
154 | *pos++ = op_class; /* give current operating class as alternate too */ | |
155 | } | |
156 | ||
2cedd879 AN |
157 | static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb) |
158 | { | |
159 | u8 *pos = (void *)skb_put(skb, 3); | |
160 | ||
161 | *pos++ = WLAN_EID_BSS_COEX_2040; | |
162 | *pos++ = 1; /* len */ | |
163 | ||
164 | *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST; | |
165 | } | |
166 | ||
dd8c0b03 AN |
167 | static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata, |
168 | u16 status_code) | |
95224fe8 | 169 | { |
dd8c0b03 AN |
170 | /* The capability will be 0 when sending a failure code */ |
171 | if (status_code != 0) | |
172 | return 0; | |
173 | ||
ea1b2b45 JB |
174 | if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_2GHZ) { |
175 | return WLAN_CAPABILITY_SHORT_SLOT_TIME | | |
176 | WLAN_CAPABILITY_SHORT_PREAMBLE; | |
177 | } | |
95224fe8 | 178 | |
ea1b2b45 | 179 | return 0; |
95224fe8 AN |
180 | } |
181 | ||
1606ef4a AN |
182 | static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata, |
183 | struct sk_buff *skb, const u8 *peer, | |
184 | bool initiator) | |
95224fe8 AN |
185 | { |
186 | struct ieee80211_tdls_lnkie *lnkid; | |
1606ef4a AN |
187 | const u8 *init_addr, *rsp_addr; |
188 | ||
189 | if (initiator) { | |
190 | init_addr = sdata->vif.addr; | |
191 | rsp_addr = peer; | |
192 | } else { | |
193 | init_addr = peer; | |
194 | rsp_addr = sdata->vif.addr; | |
195 | } | |
95224fe8 AN |
196 | |
197 | lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie)); | |
198 | ||
199 | lnkid->ie_type = WLAN_EID_LINK_ID; | |
200 | lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2; | |
201 | ||
1606ef4a AN |
202 | memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
203 | memcpy(lnkid->init_sta, init_addr, ETH_ALEN); | |
204 | memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN); | |
95224fe8 AN |
205 | } |
206 | ||
fb28ec0c AN |
207 | static void |
208 | ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) | |
209 | { | |
210 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; | |
211 | u8 *pos = (void *)skb_put(skb, 4); | |
212 | ||
213 | *pos++ = WLAN_EID_AID; | |
214 | *pos++ = 2; /* len */ | |
215 | put_unaligned_le16(ifmgd->aid, pos); | |
216 | } | |
217 | ||
6f7eaa47 AN |
218 | /* translate numbering in the WMM parameter IE to the mac80211 notation */ |
219 | static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac) | |
220 | { | |
221 | switch (ac) { | |
222 | default: | |
223 | WARN_ON_ONCE(1); | |
224 | case 0: | |
225 | return IEEE80211_AC_BE; | |
226 | case 1: | |
227 | return IEEE80211_AC_BK; | |
228 | case 2: | |
229 | return IEEE80211_AC_VI; | |
230 | case 3: | |
231 | return IEEE80211_AC_VO; | |
232 | } | |
233 | } | |
234 | ||
235 | static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci) | |
236 | { | |
237 | u8 ret; | |
238 | ||
239 | ret = aifsn & 0x0f; | |
240 | if (acm) | |
241 | ret |= 0x10; | |
242 | ret |= (aci << 5) & 0x60; | |
243 | return ret; | |
244 | } | |
245 | ||
246 | static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max) | |
247 | { | |
248 | return ((ilog2(cw_min + 1) << 0x0) & 0x0f) | | |
249 | ((ilog2(cw_max + 1) << 0x4) & 0xf0); | |
250 | } | |
251 | ||
252 | static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata, | |
253 | struct sk_buff *skb) | |
254 | { | |
255 | struct ieee80211_wmm_param_ie *wmm; | |
256 | struct ieee80211_tx_queue_params *txq; | |
257 | int i; | |
258 | ||
259 | wmm = (void *)skb_put(skb, sizeof(*wmm)); | |
260 | memset(wmm, 0, sizeof(*wmm)); | |
261 | ||
262 | wmm->element_id = WLAN_EID_VENDOR_SPECIFIC; | |
263 | wmm->len = sizeof(*wmm) - 2; | |
264 | ||
265 | wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */ | |
266 | wmm->oui[1] = 0x50; | |
267 | wmm->oui[2] = 0xf2; | |
268 | wmm->oui_type = 2; /* WME */ | |
269 | wmm->oui_subtype = 1; /* WME param */ | |
270 | wmm->version = 1; /* WME ver */ | |
271 | wmm->qos_info = 0; /* U-APSD not in use */ | |
272 | ||
273 | /* | |
274 | * Use the EDCA parameters defined for the BSS, or default if the AP | |
275 | * doesn't support it, as mandated by 802.11-2012 section 10.22.4 | |
276 | */ | |
277 | for (i = 0; i < IEEE80211_NUM_ACS; i++) { | |
278 | txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)]; | |
279 | wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs, | |
280 | txq->acm, i); | |
281 | wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max); | |
282 | wmm->ac[i].txop_limit = cpu_to_le16(txq->txop); | |
283 | } | |
284 | } | |
285 | ||
f09a87d2 AN |
286 | static void |
287 | ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata, | |
288 | struct sk_buff *skb, const u8 *peer, | |
1606ef4a AN |
289 | u8 action_code, bool initiator, |
290 | const u8 *extra_ies, size_t extra_ies_len) | |
f09a87d2 AN |
291 | { |
292 | enum ieee80211_band band = ieee80211_get_sdata_band(sdata); | |
40b861a0 | 293 | struct ieee80211_local *local = sdata->local; |
13cc8a4a AN |
294 | struct ieee80211_supported_band *sband; |
295 | struct ieee80211_sta_ht_cap ht_cap; | |
fb28ec0c | 296 | struct ieee80211_sta_vht_cap vht_cap; |
13cc8a4a | 297 | struct sta_info *sta = NULL; |
f09a87d2 AN |
298 | size_t offset = 0, noffset; |
299 | u8 *pos; | |
300 | ||
301 | ieee80211_add_srates_ie(sdata, skb, false, band); | |
302 | ieee80211_add_ext_srates_ie(sdata, skb, false, band); | |
f0d29cb9 | 303 | ieee80211_tdls_add_supp_channels(sdata, skb); |
f09a87d2 AN |
304 | |
305 | /* add any custom IEs that go before Extended Capabilities */ | |
306 | if (extra_ies_len) { | |
307 | static const u8 before_ext_cap[] = { | |
308 | WLAN_EID_SUPP_RATES, | |
309 | WLAN_EID_COUNTRY, | |
310 | WLAN_EID_EXT_SUPP_RATES, | |
311 | WLAN_EID_SUPPORTED_CHANNELS, | |
312 | WLAN_EID_RSN, | |
313 | }; | |
314 | noffset = ieee80211_ie_split(extra_ies, extra_ies_len, | |
315 | before_ext_cap, | |
316 | ARRAY_SIZE(before_ext_cap), | |
317 | offset); | |
318 | pos = skb_put(skb, noffset - offset); | |
319 | memcpy(pos, extra_ies + offset, noffset - offset); | |
320 | offset = noffset; | |
321 | } | |
322 | ||
78632a17 | 323 | ieee80211_tdls_add_ext_capab(local, skb); |
f09a87d2 | 324 | |
40b861a0 AN |
325 | /* add the QoS element if we support it */ |
326 | if (local->hw.queues >= IEEE80211_NUM_ACS && | |
327 | action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) | |
328 | ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */ | |
329 | ||
f09a87d2 AN |
330 | /* add any custom IEs that go before HT capabilities */ |
331 | if (extra_ies_len) { | |
332 | static const u8 before_ht_cap[] = { | |
333 | WLAN_EID_SUPP_RATES, | |
334 | WLAN_EID_COUNTRY, | |
335 | WLAN_EID_EXT_SUPP_RATES, | |
336 | WLAN_EID_SUPPORTED_CHANNELS, | |
337 | WLAN_EID_RSN, | |
338 | WLAN_EID_EXT_CAPABILITY, | |
339 | WLAN_EID_QOS_CAPA, | |
340 | WLAN_EID_FAST_BSS_TRANSITION, | |
341 | WLAN_EID_TIMEOUT_INTERVAL, | |
342 | WLAN_EID_SUPPORTED_REGULATORY_CLASSES, | |
343 | }; | |
344 | noffset = ieee80211_ie_split(extra_ies, extra_ies_len, | |
345 | before_ht_cap, | |
346 | ARRAY_SIZE(before_ht_cap), | |
347 | offset); | |
348 | pos = skb_put(skb, noffset - offset); | |
349 | memcpy(pos, extra_ies + offset, noffset - offset); | |
350 | offset = noffset; | |
351 | } | |
352 | ||
ae2e9fba AN |
353 | rcu_read_lock(); |
354 | ||
355 | /* we should have the peer STA if we're already responding */ | |
356 | if (action_code == WLAN_TDLS_SETUP_RESPONSE) { | |
357 | sta = sta_info_get(sdata, peer); | |
358 | if (WARN_ON_ONCE(!sta)) { | |
359 | rcu_read_unlock(); | |
360 | return; | |
361 | } | |
362 | } | |
363 | ||
a38700dd AN |
364 | ieee80211_tdls_add_oper_classes(sdata, skb); |
365 | ||
13cc8a4a AN |
366 | /* |
367 | * with TDLS we can switch channels, and HT-caps are not necessarily | |
368 | * the same on all bands. The specification limits the setup to a | |
369 | * single HT-cap, so use the current band for now. | |
370 | */ | |
371 | sband = local->hw.wiphy->bands[band]; | |
372 | memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); | |
c5309ba7 | 373 | |
070e176a AN |
374 | if ((action_code == WLAN_TDLS_SETUP_REQUEST || |
375 | action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && | |
376 | ht_cap.ht_supported) { | |
c5309ba7 JB |
377 | ieee80211_apply_htcap_overrides(sdata, &ht_cap); |
378 | ||
379 | /* disable SMPS in TDLS initiator */ | |
380 | ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED | |
381 | << IEEE80211_HT_CAP_SM_PS_SHIFT; | |
382 | ||
383 | pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); | |
384 | ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); | |
385 | } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && | |
386 | ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { | |
387 | /* disable SMPS in TDLS responder */ | |
388 | sta->sta.ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED | |
389 | << IEEE80211_HT_CAP_SM_PS_SHIFT; | |
390 | ||
391 | /* the peer caps are already intersected with our own */ | |
392 | memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap)); | |
13cc8a4a AN |
393 | |
394 | pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); | |
395 | ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); | |
396 | } | |
397 | ||
2cedd879 AN |
398 | if (ht_cap.ht_supported && |
399 | (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) | |
400 | ieee80211_tdls_add_bss_coex_ie(skb); | |
401 | ||
fb28ec0c AN |
402 | ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); |
403 | ||
404 | /* add any custom IEs that go before VHT capabilities */ | |
405 | if (extra_ies_len) { | |
406 | static const u8 before_vht_cap[] = { | |
407 | WLAN_EID_SUPP_RATES, | |
408 | WLAN_EID_COUNTRY, | |
409 | WLAN_EID_EXT_SUPP_RATES, | |
410 | WLAN_EID_SUPPORTED_CHANNELS, | |
411 | WLAN_EID_RSN, | |
412 | WLAN_EID_EXT_CAPABILITY, | |
413 | WLAN_EID_QOS_CAPA, | |
414 | WLAN_EID_FAST_BSS_TRANSITION, | |
415 | WLAN_EID_TIMEOUT_INTERVAL, | |
416 | WLAN_EID_SUPPORTED_REGULATORY_CLASSES, | |
417 | WLAN_EID_MULTI_BAND, | |
418 | }; | |
419 | noffset = ieee80211_ie_split(extra_ies, extra_ies_len, | |
420 | before_vht_cap, | |
421 | ARRAY_SIZE(before_vht_cap), | |
422 | offset); | |
423 | pos = skb_put(skb, noffset - offset); | |
424 | memcpy(pos, extra_ies + offset, noffset - offset); | |
425 | offset = noffset; | |
426 | } | |
427 | ||
428 | /* build the VHT-cap similarly to the HT-cap */ | |
429 | memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); | |
070e176a AN |
430 | if ((action_code == WLAN_TDLS_SETUP_REQUEST || |
431 | action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && | |
432 | vht_cap.vht_supported) { | |
fb28ec0c AN |
433 | ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); |
434 | ||
435 | /* the AID is present only when VHT is implemented */ | |
070e176a AN |
436 | if (action_code == WLAN_TDLS_SETUP_REQUEST) |
437 | ieee80211_tdls_add_aid(sdata, skb); | |
fb28ec0c AN |
438 | |
439 | pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); | |
440 | ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); | |
441 | } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && | |
442 | vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) { | |
443 | /* the peer caps are already intersected with our own */ | |
444 | memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap)); | |
445 | ||
446 | /* the AID is present only when VHT is implemented */ | |
447 | ieee80211_tdls_add_aid(sdata, skb); | |
448 | ||
449 | pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); | |
450 | ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); | |
451 | } | |
452 | ||
453 | rcu_read_unlock(); | |
454 | ||
f09a87d2 AN |
455 | /* add any remaining IEs */ |
456 | if (extra_ies_len) { | |
457 | noffset = extra_ies_len; | |
458 | pos = skb_put(skb, noffset - offset); | |
459 | memcpy(pos, extra_ies + offset, noffset - offset); | |
460 | } | |
1606ef4a | 461 | |
f09a87d2 AN |
462 | } |
463 | ||
6f7eaa47 AN |
464 | static void |
465 | ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata, | |
466 | struct sk_buff *skb, const u8 *peer, | |
467 | bool initiator, const u8 *extra_ies, | |
468 | size_t extra_ies_len) | |
469 | { | |
470 | struct ieee80211_local *local = sdata->local; | |
13cc8a4a | 471 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
6f7eaa47 | 472 | size_t offset = 0, noffset; |
13cc8a4a | 473 | struct sta_info *sta, *ap_sta; |
fb28ec0c | 474 | enum ieee80211_band band = ieee80211_get_sdata_band(sdata); |
6f7eaa47 AN |
475 | u8 *pos; |
476 | ||
477 | rcu_read_lock(); | |
478 | ||
479 | sta = sta_info_get(sdata, peer); | |
13cc8a4a AN |
480 | ap_sta = sta_info_get(sdata, ifmgd->bssid); |
481 | if (WARN_ON_ONCE(!sta || !ap_sta)) { | |
6f7eaa47 AN |
482 | rcu_read_unlock(); |
483 | return; | |
484 | } | |
485 | ||
486 | /* add any custom IEs that go before the QoS IE */ | |
487 | if (extra_ies_len) { | |
488 | static const u8 before_qos[] = { | |
489 | WLAN_EID_RSN, | |
490 | }; | |
491 | noffset = ieee80211_ie_split(extra_ies, extra_ies_len, | |
492 | before_qos, | |
493 | ARRAY_SIZE(before_qos), | |
494 | offset); | |
495 | pos = skb_put(skb, noffset - offset); | |
496 | memcpy(pos, extra_ies + offset, noffset - offset); | |
497 | offset = noffset; | |
498 | } | |
499 | ||
500 | /* add the QoS param IE if both the peer and we support it */ | |
a74a8c84 | 501 | if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme) |
6f7eaa47 AN |
502 | ieee80211_tdls_add_wmm_param_ie(sdata, skb); |
503 | ||
13cc8a4a AN |
504 | /* add any custom IEs that go before HT operation */ |
505 | if (extra_ies_len) { | |
506 | static const u8 before_ht_op[] = { | |
507 | WLAN_EID_RSN, | |
508 | WLAN_EID_QOS_CAPA, | |
509 | WLAN_EID_FAST_BSS_TRANSITION, | |
510 | WLAN_EID_TIMEOUT_INTERVAL, | |
511 | }; | |
512 | noffset = ieee80211_ie_split(extra_ies, extra_ies_len, | |
513 | before_ht_op, | |
514 | ARRAY_SIZE(before_ht_op), | |
515 | offset); | |
516 | pos = skb_put(skb, noffset - offset); | |
517 | memcpy(pos, extra_ies + offset, noffset - offset); | |
518 | offset = noffset; | |
519 | } | |
520 | ||
521 | /* if HT support is only added in TDLS, we need an HT-operation IE */ | |
522 | if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { | |
890b7878 AN |
523 | pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); |
524 | /* send an empty HT operation IE */ | |
525 | ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap, | |
526 | &sdata->vif.bss_conf.chandef, 0); | |
13cc8a4a AN |
527 | } |
528 | ||
fb28ec0c AN |
529 | ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); |
530 | ||
531 | /* only include VHT-operation if not on the 2.4GHz band */ | |
890b7878 AN |
532 | if (band != IEEE80211_BAND_2GHZ && sta->sta.vht_cap.vht_supported) { |
533 | pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); | |
534 | ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap, | |
535 | &sdata->vif.bss_conf.chandef); | |
fb28ec0c AN |
536 | } |
537 | ||
13cc8a4a AN |
538 | rcu_read_unlock(); |
539 | ||
6f7eaa47 AN |
540 | /* add any remaining IEs */ |
541 | if (extra_ies_len) { | |
542 | noffset = extra_ies_len; | |
543 | pos = skb_put(skb, noffset - offset); | |
544 | memcpy(pos, extra_ies + offset, noffset - offset); | |
545 | } | |
6f7eaa47 AN |
546 | } |
547 | ||
a7a6bdd0 AN |
548 | static void |
549 | ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata, | |
550 | struct sk_buff *skb, const u8 *peer, | |
551 | bool initiator, const u8 *extra_ies, | |
552 | size_t extra_ies_len, u8 oper_class, | |
553 | struct cfg80211_chan_def *chandef) | |
554 | { | |
555 | struct ieee80211_tdls_data *tf; | |
556 | size_t offset = 0, noffset; | |
557 | u8 *pos; | |
558 | ||
559 | if (WARN_ON_ONCE(!chandef)) | |
560 | return; | |
561 | ||
562 | tf = (void *)skb->data; | |
563 | tf->u.chan_switch_req.target_channel = | |
564 | ieee80211_frequency_to_channel(chandef->chan->center_freq); | |
565 | tf->u.chan_switch_req.oper_class = oper_class; | |
566 | ||
567 | if (extra_ies_len) { | |
568 | static const u8 before_lnkie[] = { | |
569 | WLAN_EID_SECONDARY_CHANNEL_OFFSET, | |
570 | }; | |
571 | noffset = ieee80211_ie_split(extra_ies, extra_ies_len, | |
572 | before_lnkie, | |
573 | ARRAY_SIZE(before_lnkie), | |
574 | offset); | |
575 | pos = skb_put(skb, noffset - offset); | |
576 | memcpy(pos, extra_ies + offset, noffset - offset); | |
577 | offset = noffset; | |
578 | } | |
579 | ||
580 | ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); | |
581 | ||
582 | /* add any remaining IEs */ | |
583 | if (extra_ies_len) { | |
584 | noffset = extra_ies_len; | |
585 | pos = skb_put(skb, noffset - offset); | |
586 | memcpy(pos, extra_ies + offset, noffset - offset); | |
587 | } | |
588 | } | |
589 | ||
8a4d32f3 AN |
590 | static void |
591 | ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata, | |
592 | struct sk_buff *skb, const u8 *peer, | |
593 | u16 status_code, bool initiator, | |
594 | const u8 *extra_ies, | |
595 | size_t extra_ies_len) | |
596 | { | |
597 | if (status_code == 0) | |
598 | ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); | |
599 | ||
600 | if (extra_ies_len) | |
601 | memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len); | |
602 | } | |
603 | ||
46792a2d AN |
604 | static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata, |
605 | struct sk_buff *skb, const u8 *peer, | |
1606ef4a AN |
606 | u8 action_code, u16 status_code, |
607 | bool initiator, const u8 *extra_ies, | |
c2733905 AN |
608 | size_t extra_ies_len, u8 oper_class, |
609 | struct cfg80211_chan_def *chandef) | |
46792a2d | 610 | { |
46792a2d AN |
611 | switch (action_code) { |
612 | case WLAN_TDLS_SETUP_REQUEST: | |
613 | case WLAN_TDLS_SETUP_RESPONSE: | |
614 | case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: | |
1606ef4a AN |
615 | if (status_code == 0) |
616 | ieee80211_tdls_add_setup_start_ies(sdata, skb, peer, | |
617 | action_code, | |
618 | initiator, | |
619 | extra_ies, | |
620 | extra_ies_len); | |
46792a2d AN |
621 | break; |
622 | case WLAN_TDLS_SETUP_CONFIRM: | |
6f7eaa47 AN |
623 | if (status_code == 0) |
624 | ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer, | |
625 | initiator, extra_ies, | |
626 | extra_ies_len); | |
627 | break; | |
46792a2d AN |
628 | case WLAN_TDLS_TEARDOWN: |
629 | case WLAN_TDLS_DISCOVERY_REQUEST: | |
f09a87d2 AN |
630 | if (extra_ies_len) |
631 | memcpy(skb_put(skb, extra_ies_len), extra_ies, | |
632 | extra_ies_len); | |
1606ef4a AN |
633 | if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN) |
634 | ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); | |
46792a2d | 635 | break; |
a7a6bdd0 AN |
636 | case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: |
637 | ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer, | |
638 | initiator, extra_ies, | |
639 | extra_ies_len, | |
640 | oper_class, chandef); | |
641 | break; | |
8a4d32f3 AN |
642 | case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: |
643 | ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer, | |
644 | status_code, | |
645 | initiator, extra_ies, | |
646 | extra_ies_len); | |
647 | break; | |
46792a2d AN |
648 | } |
649 | ||
46792a2d AN |
650 | } |
651 | ||
95224fe8 AN |
652 | static int |
653 | ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev, | |
3b3a0162 | 654 | const u8 *peer, u8 action_code, u8 dialog_token, |
95224fe8 AN |
655 | u16 status_code, struct sk_buff *skb) |
656 | { | |
657 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
95224fe8 AN |
658 | struct ieee80211_tdls_data *tf; |
659 | ||
660 | tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u)); | |
661 | ||
662 | memcpy(tf->da, peer, ETH_ALEN); | |
663 | memcpy(tf->sa, sdata->vif.addr, ETH_ALEN); | |
664 | tf->ether_type = cpu_to_be16(ETH_P_TDLS); | |
665 | tf->payload_type = WLAN_TDLS_SNAP_RFTYPE; | |
666 | ||
59cd85cb AN |
667 | /* network header is after the ethernet header */ |
668 | skb_set_network_header(skb, ETH_HLEN); | |
669 | ||
95224fe8 AN |
670 | switch (action_code) { |
671 | case WLAN_TDLS_SETUP_REQUEST: | |
672 | tf->category = WLAN_CATEGORY_TDLS; | |
673 | tf->action_code = WLAN_TDLS_SETUP_REQUEST; | |
674 | ||
675 | skb_put(skb, sizeof(tf->u.setup_req)); | |
676 | tf->u.setup_req.dialog_token = dialog_token; | |
677 | tf->u.setup_req.capability = | |
dd8c0b03 AN |
678 | cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, |
679 | status_code)); | |
95224fe8 AN |
680 | break; |
681 | case WLAN_TDLS_SETUP_RESPONSE: | |
682 | tf->category = WLAN_CATEGORY_TDLS; | |
683 | tf->action_code = WLAN_TDLS_SETUP_RESPONSE; | |
684 | ||
685 | skb_put(skb, sizeof(tf->u.setup_resp)); | |
686 | tf->u.setup_resp.status_code = cpu_to_le16(status_code); | |
687 | tf->u.setup_resp.dialog_token = dialog_token; | |
688 | tf->u.setup_resp.capability = | |
dd8c0b03 AN |
689 | cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, |
690 | status_code)); | |
95224fe8 AN |
691 | break; |
692 | case WLAN_TDLS_SETUP_CONFIRM: | |
693 | tf->category = WLAN_CATEGORY_TDLS; | |
694 | tf->action_code = WLAN_TDLS_SETUP_CONFIRM; | |
695 | ||
696 | skb_put(skb, sizeof(tf->u.setup_cfm)); | |
697 | tf->u.setup_cfm.status_code = cpu_to_le16(status_code); | |
698 | tf->u.setup_cfm.dialog_token = dialog_token; | |
699 | break; | |
700 | case WLAN_TDLS_TEARDOWN: | |
701 | tf->category = WLAN_CATEGORY_TDLS; | |
702 | tf->action_code = WLAN_TDLS_TEARDOWN; | |
703 | ||
704 | skb_put(skb, sizeof(tf->u.teardown)); | |
705 | tf->u.teardown.reason_code = cpu_to_le16(status_code); | |
706 | break; | |
707 | case WLAN_TDLS_DISCOVERY_REQUEST: | |
708 | tf->category = WLAN_CATEGORY_TDLS; | |
709 | tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST; | |
710 | ||
711 | skb_put(skb, sizeof(tf->u.discover_req)); | |
712 | tf->u.discover_req.dialog_token = dialog_token; | |
713 | break; | |
a7a6bdd0 AN |
714 | case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: |
715 | tf->category = WLAN_CATEGORY_TDLS; | |
716 | tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; | |
717 | ||
718 | skb_put(skb, sizeof(tf->u.chan_switch_req)); | |
719 | break; | |
8a4d32f3 AN |
720 | case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: |
721 | tf->category = WLAN_CATEGORY_TDLS; | |
722 | tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; | |
723 | ||
724 | skb_put(skb, sizeof(tf->u.chan_switch_resp)); | |
725 | tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code); | |
726 | break; | |
95224fe8 AN |
727 | default: |
728 | return -EINVAL; | |
729 | } | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
734 | static int | |
735 | ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev, | |
3b3a0162 | 736 | const u8 *peer, u8 action_code, u8 dialog_token, |
95224fe8 AN |
737 | u16 status_code, struct sk_buff *skb) |
738 | { | |
739 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
95224fe8 AN |
740 | struct ieee80211_mgmt *mgmt; |
741 | ||
742 | mgmt = (void *)skb_put(skb, 24); | |
743 | memset(mgmt, 0, 24); | |
744 | memcpy(mgmt->da, peer, ETH_ALEN); | |
745 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); | |
746 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
747 | ||
748 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
749 | IEEE80211_STYPE_ACTION); | |
750 | ||
751 | switch (action_code) { | |
752 | case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: | |
753 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp)); | |
754 | mgmt->u.action.category = WLAN_CATEGORY_PUBLIC; | |
755 | mgmt->u.action.u.tdls_discover_resp.action_code = | |
756 | WLAN_PUB_ACTION_TDLS_DISCOVER_RES; | |
757 | mgmt->u.action.u.tdls_discover_resp.dialog_token = | |
758 | dialog_token; | |
759 | mgmt->u.action.u.tdls_discover_resp.capability = | |
dd8c0b03 AN |
760 | cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, |
761 | status_code)); | |
95224fe8 AN |
762 | break; |
763 | default: | |
764 | return -EINVAL; | |
765 | } | |
766 | ||
767 | return 0; | |
768 | } | |
769 | ||
c2733905 AN |
770 | static struct sk_buff * |
771 | ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata, | |
772 | const u8 *peer, u8 action_code, | |
773 | u8 dialog_token, u16 status_code, | |
774 | bool initiator, const u8 *extra_ies, | |
775 | size_t extra_ies_len, u8 oper_class, | |
776 | struct cfg80211_chan_def *chandef) | |
95224fe8 | 777 | { |
95224fe8 | 778 | struct ieee80211_local *local = sdata->local; |
c2733905 | 779 | struct sk_buff *skb; |
95224fe8 AN |
780 | int ret; |
781 | ||
c2733905 | 782 | skb = netdev_alloc_skb(sdata->dev, |
1277b4a9 LK |
783 | local->hw.extra_tx_headroom + |
784 | max(sizeof(struct ieee80211_mgmt), | |
785 | sizeof(struct ieee80211_tdls_data)) + | |
786 | 50 + /* supported rates */ | |
787 | 7 + /* ext capab */ | |
788 | 26 + /* max(WMM-info, WMM-param) */ | |
789 | 2 + max(sizeof(struct ieee80211_ht_cap), | |
790 | sizeof(struct ieee80211_ht_operation)) + | |
fb28ec0c AN |
791 | 2 + max(sizeof(struct ieee80211_vht_cap), |
792 | sizeof(struct ieee80211_vht_operation)) + | |
f0d29cb9 | 793 | 50 + /* supported channels */ |
2cedd879 | 794 | 3 + /* 40/20 BSS coex */ |
fb28ec0c | 795 | 4 + /* AID */ |
a38700dd | 796 | 4 + /* oper classes */ |
1277b4a9 LK |
797 | extra_ies_len + |
798 | sizeof(struct ieee80211_tdls_lnkie)); | |
95224fe8 | 799 | if (!skb) |
c2733905 | 800 | return NULL; |
95224fe8 AN |
801 | |
802 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
803 | ||
804 | switch (action_code) { | |
805 | case WLAN_TDLS_SETUP_REQUEST: | |
806 | case WLAN_TDLS_SETUP_RESPONSE: | |
807 | case WLAN_TDLS_SETUP_CONFIRM: | |
808 | case WLAN_TDLS_TEARDOWN: | |
809 | case WLAN_TDLS_DISCOVERY_REQUEST: | |
a7a6bdd0 | 810 | case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: |
8a4d32f3 | 811 | case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: |
c2733905 AN |
812 | ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy, |
813 | sdata->dev, peer, | |
95224fe8 AN |
814 | action_code, dialog_token, |
815 | status_code, skb); | |
95224fe8 AN |
816 | break; |
817 | case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: | |
c2733905 AN |
818 | ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev, |
819 | peer, action_code, | |
95224fe8 AN |
820 | dialog_token, status_code, |
821 | skb); | |
95224fe8 AN |
822 | break; |
823 | default: | |
824 | ret = -ENOTSUPP; | |
825 | break; | |
826 | } | |
827 | ||
828 | if (ret < 0) | |
829 | goto fail; | |
830 | ||
c2733905 AN |
831 | ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code, |
832 | initiator, extra_ies, extra_ies_len, oper_class, | |
833 | chandef); | |
834 | return skb; | |
835 | ||
836 | fail: | |
837 | dev_kfree_skb(skb); | |
838 | return NULL; | |
839 | } | |
840 | ||
841 | static int | |
842 | ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, | |
843 | const u8 *peer, u8 action_code, u8 dialog_token, | |
844 | u16 status_code, u32 peer_capability, | |
845 | bool initiator, const u8 *extra_ies, | |
846 | size_t extra_ies_len, u8 oper_class, | |
847 | struct cfg80211_chan_def *chandef) | |
848 | { | |
849 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
850 | struct sk_buff *skb = NULL; | |
851 | struct sta_info *sta; | |
852 | u32 flags = 0; | |
853 | int ret = 0; | |
854 | ||
626911cc AN |
855 | rcu_read_lock(); |
856 | sta = sta_info_get(sdata, peer); | |
857 | ||
858 | /* infer the initiator if we can, to support old userspace */ | |
95224fe8 AN |
859 | switch (action_code) { |
860 | case WLAN_TDLS_SETUP_REQUEST: | |
8b94148c | 861 | if (sta) { |
626911cc | 862 | set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); |
8b94148c AN |
863 | sta->sta.tdls_initiator = false; |
864 | } | |
626911cc | 865 | /* fall-through */ |
95224fe8 | 866 | case WLAN_TDLS_SETUP_CONFIRM: |
95224fe8 | 867 | case WLAN_TDLS_DISCOVERY_REQUEST: |
626911cc | 868 | initiator = true; |
95224fe8 AN |
869 | break; |
870 | case WLAN_TDLS_SETUP_RESPONSE: | |
626911cc AN |
871 | /* |
872 | * In some testing scenarios, we send a request and response. | |
873 | * Make the last packet sent take effect for the initiator | |
874 | * value. | |
875 | */ | |
8b94148c | 876 | if (sta) { |
626911cc | 877 | clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); |
8b94148c AN |
878 | sta->sta.tdls_initiator = true; |
879 | } | |
626911cc | 880 | /* fall-through */ |
95224fe8 | 881 | case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: |
626911cc | 882 | initiator = false; |
2fb6b9b8 AN |
883 | break; |
884 | case WLAN_TDLS_TEARDOWN: | |
a7a6bdd0 | 885 | case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: |
8a4d32f3 | 886 | case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: |
2fb6b9b8 | 887 | /* any value is ok */ |
95224fe8 AN |
888 | break; |
889 | default: | |
890 | ret = -ENOTSUPP; | |
626911cc | 891 | break; |
95224fe8 AN |
892 | } |
893 | ||
46792a2d AN |
894 | if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR)) |
895 | initiator = true; | |
2fb6b9b8 | 896 | |
626911cc AN |
897 | rcu_read_unlock(); |
898 | if (ret < 0) | |
899 | goto fail; | |
900 | ||
c2733905 AN |
901 | skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code, |
902 | dialog_token, status_code, | |
903 | initiator, extra_ies, | |
904 | extra_ies_len, oper_class, | |
905 | chandef); | |
906 | if (!skb) { | |
907 | ret = -EINVAL; | |
908 | goto fail; | |
909 | } | |
910 | ||
911 | if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { | |
95224fe8 AN |
912 | ieee80211_tx_skb(sdata, skb); |
913 | return 0; | |
914 | } | |
915 | ||
916 | /* | |
917 | * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise | |
918 | * we should default to AC_VI. | |
919 | */ | |
920 | switch (action_code) { | |
921 | case WLAN_TDLS_SETUP_REQUEST: | |
922 | case WLAN_TDLS_SETUP_RESPONSE: | |
923 | skb_set_queue_mapping(skb, IEEE80211_AC_BK); | |
924 | skb->priority = 2; | |
925 | break; | |
926 | default: | |
927 | skb_set_queue_mapping(skb, IEEE80211_AC_VI); | |
928 | skb->priority = 5; | |
929 | break; | |
930 | } | |
931 | ||
1277b4a9 LK |
932 | /* |
933 | * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress. | |
934 | * Later, if no ACK is returned from peer, we will re-send the teardown | |
935 | * packet through the AP. | |
936 | */ | |
937 | if ((action_code == WLAN_TDLS_TEARDOWN) && | |
30686bf7 | 938 | ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { |
1277b4a9 LK |
939 | bool try_resend; /* Should we keep skb for possible resend */ |
940 | ||
941 | /* If not sending directly to peer - no point in keeping skb */ | |
942 | rcu_read_lock(); | |
943 | sta = sta_info_get(sdata, peer); | |
944 | try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); | |
945 | rcu_read_unlock(); | |
946 | ||
947 | spin_lock_bh(&sdata->u.mgd.teardown_lock); | |
948 | if (try_resend && !sdata->u.mgd.teardown_skb) { | |
949 | /* Mark it as requiring TX status callback */ | |
950 | flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | | |
951 | IEEE80211_TX_INTFL_MLME_CONN_TX; | |
952 | ||
953 | /* | |
954 | * skb is copied since mac80211 will later set | |
955 | * properties that might not be the same as the AP, | |
956 | * such as encryption, QoS, addresses, etc. | |
957 | * | |
958 | * No problem if skb_copy() fails, so no need to check. | |
959 | */ | |
960 | sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC); | |
961 | sdata->u.mgd.orig_teardown_skb = skb; | |
962 | } | |
963 | spin_unlock_bh(&sdata->u.mgd.teardown_lock); | |
964 | } | |
965 | ||
95224fe8 AN |
966 | /* disable bottom halves when entering the Tx path */ |
967 | local_bh_disable(); | |
1277b4a9 | 968 | __ieee80211_subif_start_xmit(skb, dev, flags); |
95224fe8 AN |
969 | local_bh_enable(); |
970 | ||
971 | return ret; | |
972 | ||
973 | fail: | |
974 | dev_kfree_skb(skb); | |
975 | return ret; | |
976 | } | |
977 | ||
191dd469 AN |
978 | static int |
979 | ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, | |
980 | const u8 *peer, u8 action_code, u8 dialog_token, | |
981 | u16 status_code, u32 peer_capability, bool initiator, | |
982 | const u8 *extra_ies, size_t extra_ies_len) | |
17e6a59a AN |
983 | { |
984 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
985 | struct ieee80211_local *local = sdata->local; | |
986 | int ret; | |
987 | ||
17e6a59a AN |
988 | mutex_lock(&local->mtx); |
989 | ||
990 | /* we don't support concurrent TDLS peer setups */ | |
81dd2b88 AN |
991 | if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && |
992 | !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { | |
17e6a59a | 993 | ret = -EBUSY; |
ae2e9fba | 994 | goto out_unlock; |
17e6a59a AN |
995 | } |
996 | ||
7adc3e46 AN |
997 | /* |
998 | * make sure we have a STA representing the peer so we drop or buffer | |
999 | * non-TDLS-setup frames to the peer. We can't send other packets | |
6ae32e5d AN |
1000 | * during setup through the AP path. |
1001 | * Allow error packets to be sent - sometimes we don't even add a STA | |
1002 | * before failing the setup. | |
7adc3e46 | 1003 | */ |
6ae32e5d AN |
1004 | if (status_code == 0) { |
1005 | rcu_read_lock(); | |
1006 | if (!sta_info_get(sdata, peer)) { | |
1007 | rcu_read_unlock(); | |
1008 | ret = -ENOLINK; | |
ae2e9fba | 1009 | goto out_unlock; |
6ae32e5d | 1010 | } |
7adc3e46 | 1011 | rcu_read_unlock(); |
7adc3e46 | 1012 | } |
7adc3e46 | 1013 | |
3b24f4c6 | 1014 | ieee80211_flush_queues(local, sdata, false); |
ae2e9fba AN |
1015 | memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); |
1016 | mutex_unlock(&local->mtx); | |
db67d661 | 1017 | |
ae2e9fba | 1018 | /* we cannot take the mutex while preparing the setup packet */ |
17e6a59a AN |
1019 | ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, |
1020 | dialog_token, status_code, | |
2fb6b9b8 | 1021 | peer_capability, initiator, |
c2733905 AN |
1022 | extra_ies, extra_ies_len, 0, |
1023 | NULL); | |
ae2e9fba AN |
1024 | if (ret < 0) { |
1025 | mutex_lock(&local->mtx); | |
1026 | eth_zero_addr(sdata->u.mgd.tdls_peer); | |
1027 | mutex_unlock(&local->mtx); | |
1028 | return ret; | |
1029 | } | |
17e6a59a | 1030 | |
191dd469 | 1031 | ieee80211_queue_delayed_work(&sdata->local->hw, |
81dd2b88 | 1032 | &sdata->u.mgd.tdls_peer_del_work, |
191dd469 | 1033 | TDLS_PEER_SETUP_TIMEOUT); |
ae2e9fba | 1034 | return 0; |
17e6a59a | 1035 | |
ae2e9fba | 1036 | out_unlock: |
17e6a59a | 1037 | mutex_unlock(&local->mtx); |
191dd469 AN |
1038 | return ret; |
1039 | } | |
1040 | ||
db67d661 AN |
1041 | static int |
1042 | ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, | |
1043 | const u8 *peer, u8 action_code, u8 dialog_token, | |
1044 | u16 status_code, u32 peer_capability, | |
1045 | bool initiator, const u8 *extra_ies, | |
1046 | size_t extra_ies_len) | |
1047 | { | |
1048 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1049 | struct ieee80211_local *local = sdata->local; | |
1050 | struct sta_info *sta; | |
1051 | int ret; | |
1052 | ||
1053 | /* | |
1054 | * No packets can be transmitted to the peer via the AP during setup - | |
1055 | * the STA is set as a TDLS peer, but is not authorized. | |
1056 | * During teardown, we prevent direct transmissions by stopping the | |
1057 | * queues and flushing all direct packets. | |
1058 | */ | |
1059 | ieee80211_stop_vif_queues(local, sdata, | |
1060 | IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); | |
3b24f4c6 | 1061 | ieee80211_flush_queues(local, sdata, false); |
db67d661 AN |
1062 | |
1063 | ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, | |
1064 | dialog_token, status_code, | |
1065 | peer_capability, initiator, | |
c2733905 AN |
1066 | extra_ies, extra_ies_len, 0, |
1067 | NULL); | |
db67d661 AN |
1068 | if (ret < 0) |
1069 | sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", | |
1070 | ret); | |
1071 | ||
1072 | /* | |
1073 | * Remove the STA AUTH flag to force further traffic through the AP. If | |
1074 | * the STA was unreachable, it was already removed. | |
1075 | */ | |
1076 | rcu_read_lock(); | |
1077 | sta = sta_info_get(sdata, peer); | |
1078 | if (sta) | |
1079 | clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); | |
1080 | rcu_read_unlock(); | |
1081 | ||
1082 | ieee80211_wake_vif_queues(local, sdata, | |
1083 | IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); | |
1084 | ||
1085 | return 0; | |
1086 | } | |
1087 | ||
191dd469 AN |
1088 | int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, |
1089 | const u8 *peer, u8 action_code, u8 dialog_token, | |
1090 | u16 status_code, u32 peer_capability, | |
1091 | bool initiator, const u8 *extra_ies, | |
1092 | size_t extra_ies_len) | |
1093 | { | |
1094 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1095 | int ret; | |
1096 | ||
1097 | if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) | |
1098 | return -ENOTSUPP; | |
1099 | ||
1100 | /* make sure we are in managed mode, and associated */ | |
1101 | if (sdata->vif.type != NL80211_IFTYPE_STATION || | |
1102 | !sdata->u.mgd.associated) | |
1103 | return -EINVAL; | |
1104 | ||
1105 | switch (action_code) { | |
1106 | case WLAN_TDLS_SETUP_REQUEST: | |
1107 | case WLAN_TDLS_SETUP_RESPONSE: | |
1108 | ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code, | |
1109 | dialog_token, status_code, | |
1110 | peer_capability, initiator, | |
1111 | extra_ies, extra_ies_len); | |
1112 | break; | |
1113 | case WLAN_TDLS_TEARDOWN: | |
db67d661 AN |
1114 | ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, |
1115 | action_code, dialog_token, | |
1116 | status_code, | |
1117 | peer_capability, initiator, | |
1118 | extra_ies, extra_ies_len); | |
1119 | break; | |
191dd469 | 1120 | case WLAN_TDLS_DISCOVERY_REQUEST: |
ee10f2c7 AN |
1121 | /* |
1122 | * Protect the discovery so we can hear the TDLS discovery | |
1123 | * response frame. It is transmitted directly and not buffered | |
1124 | * by the AP. | |
1125 | */ | |
1126 | drv_mgd_protect_tdls_discover(sdata->local, sdata); | |
1127 | /* fall-through */ | |
1128 | case WLAN_TDLS_SETUP_CONFIRM: | |
191dd469 AN |
1129 | case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: |
1130 | /* no special handling */ | |
1131 | ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, | |
1132 | action_code, | |
1133 | dialog_token, | |
1134 | status_code, | |
1135 | peer_capability, | |
1136 | initiator, extra_ies, | |
c2733905 | 1137 | extra_ies_len, 0, NULL); |
191dd469 AN |
1138 | break; |
1139 | default: | |
1140 | ret = -EOPNOTSUPP; | |
1141 | break; | |
1142 | } | |
17e6a59a AN |
1143 | |
1144 | tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n", | |
1145 | action_code, peer, ret); | |
1146 | return ret; | |
1147 | } | |
1148 | ||
95224fe8 | 1149 | int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, |
3b3a0162 | 1150 | const u8 *peer, enum nl80211_tdls_operation oper) |
95224fe8 AN |
1151 | { |
1152 | struct sta_info *sta; | |
1153 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
17e6a59a AN |
1154 | struct ieee80211_local *local = sdata->local; |
1155 | int ret; | |
95224fe8 AN |
1156 | |
1157 | if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) | |
1158 | return -ENOTSUPP; | |
1159 | ||
1160 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1161 | return -EINVAL; | |
1162 | ||
17e6a59a AN |
1163 | switch (oper) { |
1164 | case NL80211_TDLS_ENABLE_LINK: | |
1165 | case NL80211_TDLS_DISABLE_LINK: | |
1166 | break; | |
1167 | case NL80211_TDLS_TEARDOWN: | |
1168 | case NL80211_TDLS_SETUP: | |
1169 | case NL80211_TDLS_DISCOVERY_REQ: | |
1170 | /* We don't support in-driver setup/teardown/discovery */ | |
1171 | return -ENOTSUPP; | |
1172 | } | |
1173 | ||
1174 | mutex_lock(&local->mtx); | |
95224fe8 AN |
1175 | tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); |
1176 | ||
1177 | switch (oper) { | |
1178 | case NL80211_TDLS_ENABLE_LINK: | |
c5a71688 AN |
1179 | if (sdata->vif.csa_active) { |
1180 | tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); | |
1181 | ret = -EBUSY; | |
1182 | break; | |
1183 | } | |
1184 | ||
95224fe8 AN |
1185 | rcu_read_lock(); |
1186 | sta = sta_info_get(sdata, peer); | |
1187 | if (!sta) { | |
1188 | rcu_read_unlock(); | |
17e6a59a AN |
1189 | ret = -ENOLINK; |
1190 | break; | |
95224fe8 AN |
1191 | } |
1192 | ||
1193 | set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); | |
1194 | rcu_read_unlock(); | |
17e6a59a | 1195 | |
81dd2b88 AN |
1196 | WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || |
1197 | !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); | |
17e6a59a | 1198 | ret = 0; |
95224fe8 AN |
1199 | break; |
1200 | case NL80211_TDLS_DISABLE_LINK: | |
bb3f8486 LK |
1201 | /* |
1202 | * The teardown message in ieee80211_tdls_mgmt_teardown() was | |
1203 | * created while the queues were stopped, so it might still be | |
1204 | * pending. Before flushing the queues we need to be sure the | |
1205 | * message is handled by the tasklet handling pending messages, | |
1206 | * otherwise we might start destroying the station before | |
1207 | * sending the teardown packet. | |
1208 | * Note that this only forces the tasklet to flush pendings - | |
1209 | * not to stop the tasklet from rescheduling itself. | |
1210 | */ | |
1211 | tasklet_kill(&local->tx_pending_tasklet); | |
db67d661 | 1212 | /* flush a potentially queued teardown packet */ |
3b24f4c6 | 1213 | ieee80211_flush_queues(local, sdata, false); |
db67d661 | 1214 | |
17e6a59a AN |
1215 | ret = sta_info_destroy_addr(sdata, peer); |
1216 | break; | |
95224fe8 | 1217 | default: |
17e6a59a AN |
1218 | ret = -ENOTSUPP; |
1219 | break; | |
95224fe8 AN |
1220 | } |
1221 | ||
81dd2b88 AN |
1222 | if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { |
1223 | cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work); | |
1224 | eth_zero_addr(sdata->u.mgd.tdls_peer); | |
17e6a59a AN |
1225 | } |
1226 | ||
1227 | mutex_unlock(&local->mtx); | |
1228 | return ret; | |
95224fe8 | 1229 | } |
c887f0d3 AN |
1230 | |
1231 | void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, | |
1232 | enum nl80211_tdls_operation oper, | |
1233 | u16 reason_code, gfp_t gfp) | |
1234 | { | |
1235 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
1236 | ||
1237 | if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) { | |
1238 | sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", | |
1239 | oper); | |
1240 | return; | |
1241 | } | |
1242 | ||
1243 | cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); | |
1244 | } | |
1245 | EXPORT_SYMBOL(ieee80211_tdls_oper_request); | |
a7a6bdd0 AN |
1246 | |
1247 | static void | |
1248 | iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) | |
1249 | { | |
1250 | struct ieee80211_ch_switch_timing *ch_sw; | |
1251 | ||
1252 | *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; | |
1253 | *buf++ = sizeof(struct ieee80211_ch_switch_timing); | |
1254 | ||
1255 | ch_sw = (void *)buf; | |
1256 | ch_sw->switch_time = cpu_to_le16(switch_time); | |
1257 | ch_sw->switch_timeout = cpu_to_le16(switch_timeout); | |
1258 | } | |
1259 | ||
1260 | /* find switch timing IE in SKB ready for Tx */ | |
1261 | static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) | |
1262 | { | |
1263 | struct ieee80211_tdls_data *tf; | |
1264 | const u8 *ie_start; | |
1265 | ||
1266 | /* | |
1267 | * Get the offset for the new location of the switch timing IE. | |
1268 | * The SKB network header will now point to the "payload_type" | |
1269 | * element of the TDLS data frame struct. | |
1270 | */ | |
1271 | tf = container_of(skb->data + skb_network_offset(skb), | |
1272 | struct ieee80211_tdls_data, payload_type); | |
1273 | ie_start = tf->u.chan_switch_req.variable; | |
1274 | return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, | |
1275 | skb->len - (ie_start - skb->data)); | |
1276 | } | |
1277 | ||
1278 | static struct sk_buff * | |
1279 | ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, | |
1280 | struct cfg80211_chan_def *chandef, | |
1281 | u32 *ch_sw_tm_ie_offset) | |
1282 | { | |
1283 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
1284 | u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + | |
1285 | 2 + sizeof(struct ieee80211_ch_switch_timing)]; | |
1286 | int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); | |
1287 | u8 *pos = extra_ies; | |
1288 | struct sk_buff *skb; | |
1289 | ||
1290 | /* | |
1291 | * if chandef points to a wide channel add a Secondary-Channel | |
1292 | * Offset information element | |
1293 | */ | |
1294 | if (chandef->width == NL80211_CHAN_WIDTH_40) { | |
1295 | struct ieee80211_sec_chan_offs_ie *sec_chan_ie; | |
1296 | bool ht40plus; | |
1297 | ||
1298 | *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; | |
1299 | *pos++ = sizeof(*sec_chan_ie); | |
1300 | sec_chan_ie = (void *)pos; | |
1301 | ||
1302 | ht40plus = cfg80211_get_chandef_type(chandef) == | |
1303 | NL80211_CHAN_HT40PLUS; | |
1304 | sec_chan_ie->sec_chan_offs = ht40plus ? | |
1305 | IEEE80211_HT_PARAM_CHA_SEC_ABOVE : | |
1306 | IEEE80211_HT_PARAM_CHA_SEC_BELOW; | |
1307 | pos += sizeof(*sec_chan_ie); | |
1308 | ||
1309 | extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); | |
1310 | } | |
1311 | ||
1312 | /* just set the values to 0, this is a template */ | |
1313 | iee80211_tdls_add_ch_switch_timing(pos, 0, 0); | |
1314 | ||
1315 | skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, | |
1316 | WLAN_TDLS_CHANNEL_SWITCH_REQUEST, | |
1317 | 0, 0, !sta->sta.tdls_initiator, | |
1318 | extra_ies, extra_ies_len, | |
1319 | oper_class, chandef); | |
1320 | if (!skb) | |
1321 | return NULL; | |
1322 | ||
1323 | skb = ieee80211_build_data_template(sdata, skb, 0); | |
1324 | if (IS_ERR(skb)) { | |
1325 | tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); | |
1326 | return NULL; | |
1327 | } | |
1328 | ||
1329 | if (ch_sw_tm_ie_offset) { | |
1330 | const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); | |
1331 | ||
1332 | if (!tm_ie) { | |
1333 | tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); | |
1334 | dev_kfree_skb_any(skb); | |
1335 | return NULL; | |
1336 | } | |
1337 | ||
1338 | *ch_sw_tm_ie_offset = tm_ie - skb->data; | |
1339 | } | |
1340 | ||
1341 | tdls_dbg(sdata, | |
1342 | "TDLS channel switch request template for %pM ch %d width %d\n", | |
1343 | sta->sta.addr, chandef->chan->center_freq, chandef->width); | |
1344 | return skb; | |
1345 | } | |
1346 | ||
1347 | int | |
1348 | ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, | |
1349 | const u8 *addr, u8 oper_class, | |
1350 | struct cfg80211_chan_def *chandef) | |
1351 | { | |
1352 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1353 | struct ieee80211_local *local = sdata->local; | |
1354 | struct sta_info *sta; | |
1355 | struct sk_buff *skb = NULL; | |
1356 | u32 ch_sw_tm_ie; | |
1357 | int ret; | |
1358 | ||
1359 | mutex_lock(&local->sta_mtx); | |
1360 | sta = sta_info_get(sdata, addr); | |
1361 | if (!sta) { | |
1362 | tdls_dbg(sdata, | |
1363 | "Invalid TDLS peer %pM for channel switch request\n", | |
1364 | addr); | |
1365 | ret = -ENOENT; | |
1366 | goto out; | |
1367 | } | |
1368 | ||
1369 | if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { | |
1370 | tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", | |
1371 | addr); | |
1372 | ret = -ENOTSUPP; | |
1373 | goto out; | |
1374 | } | |
1375 | ||
1376 | skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, | |
1377 | &ch_sw_tm_ie); | |
1378 | if (!skb) { | |
1379 | ret = -ENOENT; | |
1380 | goto out; | |
1381 | } | |
1382 | ||
1383 | ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, | |
1384 | chandef, skb, ch_sw_tm_ie); | |
1385 | if (!ret) | |
1386 | set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); | |
1387 | ||
1388 | out: | |
1389 | mutex_unlock(&local->sta_mtx); | |
1390 | dev_kfree_skb_any(skb); | |
1391 | return ret; | |
1392 | } | |
1393 | ||
1394 | void | |
1395 | ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, | |
1396 | struct net_device *dev, | |
1397 | const u8 *addr) | |
1398 | { | |
1399 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1400 | struct ieee80211_local *local = sdata->local; | |
1401 | struct sta_info *sta; | |
1402 | ||
1403 | mutex_lock(&local->sta_mtx); | |
1404 | sta = sta_info_get(sdata, addr); | |
1405 | if (!sta) { | |
1406 | tdls_dbg(sdata, | |
1407 | "Invalid TDLS peer %pM for channel switch cancel\n", | |
1408 | addr); | |
1409 | goto out; | |
1410 | } | |
1411 | ||
1412 | if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { | |
1413 | tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", | |
1414 | addr); | |
1415 | goto out; | |
1416 | } | |
1417 | ||
1418 | drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); | |
1419 | clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); | |
1420 | ||
1421 | out: | |
1422 | mutex_unlock(&local->sta_mtx); | |
1423 | } | |
8a4d32f3 AN |
1424 | |
1425 | static struct sk_buff * | |
1426 | ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, | |
1427 | u32 *ch_sw_tm_ie_offset) | |
1428 | { | |
1429 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
1430 | struct sk_buff *skb; | |
1431 | u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; | |
1432 | ||
1433 | /* initial timing are always zero in the template */ | |
1434 | iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); | |
1435 | ||
1436 | skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, | |
1437 | WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, | |
1438 | 0, 0, !sta->sta.tdls_initiator, | |
1439 | extra_ies, sizeof(extra_ies), 0, NULL); | |
1440 | if (!skb) | |
1441 | return NULL; | |
1442 | ||
1443 | skb = ieee80211_build_data_template(sdata, skb, 0); | |
1444 | if (IS_ERR(skb)) { | |
1445 | tdls_dbg(sdata, | |
1446 | "Failed building TDLS channel switch resp frame\n"); | |
1447 | return NULL; | |
1448 | } | |
1449 | ||
1450 | if (ch_sw_tm_ie_offset) { | |
1451 | const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); | |
1452 | ||
1453 | if (!tm_ie) { | |
1454 | tdls_dbg(sdata, | |
1455 | "No switch timing IE in TDLS switch resp\n"); | |
1456 | dev_kfree_skb_any(skb); | |
1457 | return NULL; | |
1458 | } | |
1459 | ||
1460 | *ch_sw_tm_ie_offset = tm_ie - skb->data; | |
1461 | } | |
1462 | ||
1463 | tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", | |
1464 | sta->sta.addr); | |
1465 | return skb; | |
1466 | } | |
1467 | ||
1468 | static int | |
1469 | ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, | |
1470 | struct sk_buff *skb) | |
1471 | { | |
1472 | struct ieee80211_local *local = sdata->local; | |
1473 | struct ieee802_11_elems elems; | |
1474 | struct sta_info *sta; | |
1475 | struct ieee80211_tdls_data *tf = (void *)skb->data; | |
1476 | bool local_initiator; | |
1477 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); | |
1478 | int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); | |
1479 | struct ieee80211_tdls_ch_sw_params params = {}; | |
1480 | int ret; | |
1481 | ||
1482 | params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; | |
1483 | params.timestamp = rx_status->device_timestamp; | |
1484 | ||
1485 | if (skb->len < baselen) { | |
1486 | tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", | |
1487 | skb->len); | |
1488 | return -EINVAL; | |
1489 | } | |
1490 | ||
1491 | mutex_lock(&local->sta_mtx); | |
1492 | sta = sta_info_get(sdata, tf->sa); | |
1493 | if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { | |
1494 | tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", | |
1495 | tf->sa); | |
1496 | ret = -EINVAL; | |
1497 | goto out; | |
1498 | } | |
1499 | ||
1500 | params.sta = &sta->sta; | |
1501 | params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); | |
1502 | if (params.status != 0) { | |
1503 | ret = 0; | |
1504 | goto call_drv; | |
1505 | } | |
1506 | ||
1507 | ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, | |
1508 | skb->len - baselen, false, &elems); | |
1509 | if (elems.parse_error) { | |
1510 | tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); | |
1511 | ret = -EINVAL; | |
1512 | goto out; | |
1513 | } | |
1514 | ||
1515 | if (!elems.ch_sw_timing || !elems.lnk_id) { | |
1516 | tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); | |
1517 | ret = -EINVAL; | |
1518 | goto out; | |
1519 | } | |
1520 | ||
1521 | /* validate the initiator is set correctly */ | |
1522 | local_initiator = | |
1523 | !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); | |
1524 | if (local_initiator == sta->sta.tdls_initiator) { | |
1525 | tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); | |
1526 | ret = -EINVAL; | |
1527 | goto out; | |
1528 | } | |
1529 | ||
1530 | params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); | |
1531 | params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); | |
1532 | ||
1533 | params.tmpl_skb = | |
1534 | ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); | |
1535 | if (!params.tmpl_skb) { | |
1536 | ret = -ENOENT; | |
1537 | goto out; | |
1538 | } | |
1539 | ||
1540 | call_drv: | |
1541 | drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); | |
1542 | ||
1543 | tdls_dbg(sdata, | |
1544 | "TDLS channel switch response received from %pM status %d\n", | |
1545 | tf->sa, params.status); | |
1546 | ||
1547 | out: | |
1548 | mutex_unlock(&local->sta_mtx); | |
1549 | dev_kfree_skb_any(params.tmpl_skb); | |
1550 | return ret; | |
1551 | } | |
1552 | ||
1553 | static int | |
1554 | ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, | |
1555 | struct sk_buff *skb) | |
1556 | { | |
1557 | struct ieee80211_local *local = sdata->local; | |
1558 | struct ieee802_11_elems elems; | |
1559 | struct cfg80211_chan_def chandef; | |
1560 | struct ieee80211_channel *chan; | |
1561 | enum nl80211_channel_type chan_type; | |
1562 | int freq; | |
1563 | u8 target_channel, oper_class; | |
1564 | bool local_initiator; | |
1565 | struct sta_info *sta; | |
1566 | enum ieee80211_band band; | |
1567 | struct ieee80211_tdls_data *tf = (void *)skb->data; | |
1568 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); | |
1569 | int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); | |
1570 | struct ieee80211_tdls_ch_sw_params params = {}; | |
1571 | int ret = 0; | |
1572 | ||
1573 | params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; | |
1574 | params.timestamp = rx_status->device_timestamp; | |
1575 | ||
1576 | if (skb->len < baselen) { | |
1577 | tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", | |
1578 | skb->len); | |
1579 | return -EINVAL; | |
1580 | } | |
1581 | ||
1582 | target_channel = tf->u.chan_switch_req.target_channel; | |
1583 | oper_class = tf->u.chan_switch_req.oper_class; | |
1584 | ||
1585 | /* | |
1586 | * We can't easily infer the channel band. The operating class is | |
1587 | * ambiguous - there are multiple tables (US/Europe/JP/Global). The | |
1588 | * solution here is to treat channels with number >14 as 5GHz ones, | |
1589 | * and specifically check for the (oper_class, channel) combinations | |
1590 | * where this doesn't hold. These are thankfully unique according to | |
1591 | * IEEE802.11-2012. | |
1592 | * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as | |
1593 | * valid here. | |
1594 | */ | |
1595 | if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || | |
1596 | oper_class == 4 || oper_class == 5 || oper_class == 6) && | |
1597 | target_channel < 14) | |
1598 | band = IEEE80211_BAND_5GHZ; | |
1599 | else | |
1600 | band = target_channel < 14 ? IEEE80211_BAND_2GHZ : | |
1601 | IEEE80211_BAND_5GHZ; | |
1602 | ||
1603 | freq = ieee80211_channel_to_frequency(target_channel, band); | |
1604 | if (freq == 0) { | |
1605 | tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", | |
1606 | target_channel); | |
1607 | return -EINVAL; | |
1608 | } | |
1609 | ||
1610 | chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); | |
1611 | if (!chan) { | |
1612 | tdls_dbg(sdata, | |
1613 | "Unsupported channel for TDLS chan switch: %d\n", | |
1614 | target_channel); | |
1615 | return -EINVAL; | |
1616 | } | |
1617 | ||
1618 | ieee802_11_parse_elems(tf->u.chan_switch_req.variable, | |
1619 | skb->len - baselen, false, &elems); | |
1620 | if (elems.parse_error) { | |
1621 | tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); | |
1622 | return -EINVAL; | |
1623 | } | |
1624 | ||
1625 | if (!elems.ch_sw_timing || !elems.lnk_id) { | |
1626 | tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); | |
1627 | return -EINVAL; | |
1628 | } | |
1629 | ||
1630 | mutex_lock(&local->sta_mtx); | |
1631 | sta = sta_info_get(sdata, tf->sa); | |
1632 | if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { | |
1633 | tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", | |
1634 | tf->sa); | |
1635 | ret = -EINVAL; | |
1636 | goto out; | |
1637 | } | |
1638 | ||
1639 | params.sta = &sta->sta; | |
1640 | ||
1641 | /* validate the initiator is set correctly */ | |
1642 | local_initiator = | |
1643 | !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); | |
1644 | if (local_initiator == sta->sta.tdls_initiator) { | |
1645 | tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); | |
1646 | ret = -EINVAL; | |
1647 | goto out; | |
1648 | } | |
1649 | ||
1650 | if (!sta->sta.ht_cap.ht_supported) { | |
1651 | chan_type = NL80211_CHAN_NO_HT; | |
1652 | } else if (!elems.sec_chan_offs) { | |
1653 | chan_type = NL80211_CHAN_HT20; | |
1654 | } else { | |
1655 | switch (elems.sec_chan_offs->sec_chan_offs) { | |
1656 | case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: | |
1657 | chan_type = NL80211_CHAN_HT40PLUS; | |
1658 | break; | |
1659 | case IEEE80211_HT_PARAM_CHA_SEC_BELOW: | |
1660 | chan_type = NL80211_CHAN_HT40MINUS; | |
1661 | break; | |
1662 | default: | |
1663 | chan_type = NL80211_CHAN_HT20; | |
1664 | break; | |
1665 | } | |
1666 | } | |
1667 | ||
1668 | cfg80211_chandef_create(&chandef, chan, chan_type); | |
1669 | params.chandef = &chandef; | |
1670 | ||
1671 | params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); | |
1672 | params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); | |
1673 | ||
1674 | params.tmpl_skb = | |
1675 | ieee80211_tdls_ch_sw_resp_tmpl_get(sta, | |
1676 | ¶ms.ch_sw_tm_ie); | |
1677 | if (!params.tmpl_skb) { | |
1678 | ret = -ENOENT; | |
1679 | goto out; | |
1680 | } | |
1681 | ||
1682 | drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); | |
1683 | ||
1684 | tdls_dbg(sdata, | |
1685 | "TDLS ch switch request received from %pM ch %d width %d\n", | |
1686 | tf->sa, params.chandef->chan->center_freq, | |
1687 | params.chandef->width); | |
1688 | out: | |
1689 | mutex_unlock(&local->sta_mtx); | |
1690 | dev_kfree_skb_any(params.tmpl_skb); | |
1691 | return ret; | |
1692 | } | |
1693 | ||
1694 | void ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, | |
1695 | struct sk_buff *skb) | |
1696 | { | |
1697 | struct ieee80211_tdls_data *tf = (void *)skb->data; | |
1698 | struct wiphy *wiphy = sdata->local->hw.wiphy; | |
1699 | ||
1700 | /* make sure the driver supports it */ | |
1701 | if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) | |
1702 | return; | |
1703 | ||
1704 | /* we want to access the entire packet */ | |
1705 | if (skb_linearize(skb)) | |
1706 | return; | |
1707 | /* | |
1708 | * The packet/size was already validated by mac80211 Rx path, only look | |
1709 | * at the action type. | |
1710 | */ | |
1711 | switch (tf->action_code) { | |
1712 | case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: | |
1713 | ieee80211_process_tdls_channel_switch_req(sdata, skb); | |
1714 | break; | |
1715 | case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: | |
1716 | ieee80211_process_tdls_channel_switch_resp(sdata, skb); | |
1717 | break; | |
1718 | default: | |
1719 | WARN_ON_ONCE(1); | |
1720 | return; | |
1721 | } | |
1722 | } |