Commit | Line | Data |
---|---|---|
95224fe8 AN |
1 | /* |
2 | * mac80211 TDLS handling code | |
3 | * | |
4 | * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> | |
5 | * Copyright 2014, Intel Corporation | |
6 | * | |
7 | * This file is GPLv2 as found in COPYING. | |
8 | */ | |
9 | ||
10 | #include <linux/ieee80211.h> | |
6f7eaa47 | 11 | #include <linux/log2.h> |
c887f0d3 | 12 | #include <net/cfg80211.h> |
95224fe8 | 13 | #include "ieee80211_i.h" |
ee10f2c7 | 14 | #include "driver-ops.h" |
95224fe8 | 15 | |
17e6a59a AN |
16 | /* give usermode some time for retries in setting up the TDLS session */ |
17 | #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ) | |
18 | ||
19 | void ieee80211_tdls_peer_del_work(struct work_struct *wk) | |
20 | { | |
21 | struct ieee80211_sub_if_data *sdata; | |
22 | struct ieee80211_local *local; | |
23 | ||
24 | sdata = container_of(wk, struct ieee80211_sub_if_data, | |
81dd2b88 | 25 | u.mgd.tdls_peer_del_work.work); |
17e6a59a AN |
26 | local = sdata->local; |
27 | ||
28 | mutex_lock(&local->mtx); | |
81dd2b88 AN |
29 | if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) { |
30 | tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer); | |
31 | sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer); | |
32 | eth_zero_addr(sdata->u.mgd.tdls_peer); | |
17e6a59a AN |
33 | } |
34 | mutex_unlock(&local->mtx); | |
35 | } | |
36 | ||
95224fe8 AN |
37 | static void ieee80211_tdls_add_ext_capab(struct sk_buff *skb) |
38 | { | |
39 | u8 *pos = (void *)skb_put(skb, 7); | |
40 | ||
41 | *pos++ = WLAN_EID_EXT_CAPABILITY; | |
42 | *pos++ = 5; /* len */ | |
43 | *pos++ = 0x0; | |
44 | *pos++ = 0x0; | |
45 | *pos++ = 0x0; | |
46 | *pos++ = 0x0; | |
47 | *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED; | |
48 | } | |
49 | ||
dd8c0b03 AN |
50 | static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata, |
51 | u16 status_code) | |
95224fe8 AN |
52 | { |
53 | struct ieee80211_local *local = sdata->local; | |
54 | u16 capab; | |
55 | ||
dd8c0b03 AN |
56 | /* The capability will be 0 when sending a failure code */ |
57 | if (status_code != 0) | |
58 | return 0; | |
59 | ||
95224fe8 AN |
60 | capab = 0; |
61 | if (ieee80211_get_sdata_band(sdata) != IEEE80211_BAND_2GHZ) | |
62 | return capab; | |
63 | ||
64 | if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)) | |
65 | capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME; | |
66 | if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)) | |
67 | capab |= WLAN_CAPABILITY_SHORT_PREAMBLE; | |
68 | ||
69 | return capab; | |
70 | } | |
71 | ||
1606ef4a AN |
72 | static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata, |
73 | struct sk_buff *skb, const u8 *peer, | |
74 | bool initiator) | |
95224fe8 AN |
75 | { |
76 | struct ieee80211_tdls_lnkie *lnkid; | |
1606ef4a AN |
77 | const u8 *init_addr, *rsp_addr; |
78 | ||
79 | if (initiator) { | |
80 | init_addr = sdata->vif.addr; | |
81 | rsp_addr = peer; | |
82 | } else { | |
83 | init_addr = peer; | |
84 | rsp_addr = sdata->vif.addr; | |
85 | } | |
95224fe8 AN |
86 | |
87 | lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie)); | |
88 | ||
89 | lnkid->ie_type = WLAN_EID_LINK_ID; | |
90 | lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2; | |
91 | ||
1606ef4a AN |
92 | memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
93 | memcpy(lnkid->init_sta, init_addr, ETH_ALEN); | |
94 | memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN); | |
95224fe8 AN |
95 | } |
96 | ||
6f7eaa47 AN |
97 | /* translate numbering in the WMM parameter IE to the mac80211 notation */ |
98 | static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac) | |
99 | { | |
100 | switch (ac) { | |
101 | default: | |
102 | WARN_ON_ONCE(1); | |
103 | case 0: | |
104 | return IEEE80211_AC_BE; | |
105 | case 1: | |
106 | return IEEE80211_AC_BK; | |
107 | case 2: | |
108 | return IEEE80211_AC_VI; | |
109 | case 3: | |
110 | return IEEE80211_AC_VO; | |
111 | } | |
112 | } | |
113 | ||
114 | static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci) | |
115 | { | |
116 | u8 ret; | |
117 | ||
118 | ret = aifsn & 0x0f; | |
119 | if (acm) | |
120 | ret |= 0x10; | |
121 | ret |= (aci << 5) & 0x60; | |
122 | return ret; | |
123 | } | |
124 | ||
125 | static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max) | |
126 | { | |
127 | return ((ilog2(cw_min + 1) << 0x0) & 0x0f) | | |
128 | ((ilog2(cw_max + 1) << 0x4) & 0xf0); | |
129 | } | |
130 | ||
131 | static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata, | |
132 | struct sk_buff *skb) | |
133 | { | |
134 | struct ieee80211_wmm_param_ie *wmm; | |
135 | struct ieee80211_tx_queue_params *txq; | |
136 | int i; | |
137 | ||
138 | wmm = (void *)skb_put(skb, sizeof(*wmm)); | |
139 | memset(wmm, 0, sizeof(*wmm)); | |
140 | ||
141 | wmm->element_id = WLAN_EID_VENDOR_SPECIFIC; | |
142 | wmm->len = sizeof(*wmm) - 2; | |
143 | ||
144 | wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */ | |
145 | wmm->oui[1] = 0x50; | |
146 | wmm->oui[2] = 0xf2; | |
147 | wmm->oui_type = 2; /* WME */ | |
148 | wmm->oui_subtype = 1; /* WME param */ | |
149 | wmm->version = 1; /* WME ver */ | |
150 | wmm->qos_info = 0; /* U-APSD not in use */ | |
151 | ||
152 | /* | |
153 | * Use the EDCA parameters defined for the BSS, or default if the AP | |
154 | * doesn't support it, as mandated by 802.11-2012 section 10.22.4 | |
155 | */ | |
156 | for (i = 0; i < IEEE80211_NUM_ACS; i++) { | |
157 | txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)]; | |
158 | wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs, | |
159 | txq->acm, i); | |
160 | wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max); | |
161 | wmm->ac[i].txop_limit = cpu_to_le16(txq->txop); | |
162 | } | |
163 | } | |
164 | ||
f09a87d2 AN |
165 | static void |
166 | ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata, | |
167 | struct sk_buff *skb, const u8 *peer, | |
1606ef4a AN |
168 | u8 action_code, bool initiator, |
169 | const u8 *extra_ies, size_t extra_ies_len) | |
f09a87d2 AN |
170 | { |
171 | enum ieee80211_band band = ieee80211_get_sdata_band(sdata); | |
40b861a0 | 172 | struct ieee80211_local *local = sdata->local; |
13cc8a4a AN |
173 | struct ieee80211_supported_band *sband; |
174 | struct ieee80211_sta_ht_cap ht_cap; | |
175 | struct sta_info *sta = NULL; | |
f09a87d2 AN |
176 | size_t offset = 0, noffset; |
177 | u8 *pos; | |
178 | ||
13cc8a4a AN |
179 | rcu_read_lock(); |
180 | ||
181 | /* we should have the peer STA if we're already responding */ | |
182 | if (action_code == WLAN_TDLS_SETUP_RESPONSE) { | |
183 | sta = sta_info_get(sdata, peer); | |
184 | if (WARN_ON_ONCE(!sta)) { | |
185 | rcu_read_unlock(); | |
186 | return; | |
187 | } | |
188 | } | |
189 | ||
f09a87d2 AN |
190 | ieee80211_add_srates_ie(sdata, skb, false, band); |
191 | ieee80211_add_ext_srates_ie(sdata, skb, false, band); | |
192 | ||
193 | /* add any custom IEs that go before Extended Capabilities */ | |
194 | if (extra_ies_len) { | |
195 | static const u8 before_ext_cap[] = { | |
196 | WLAN_EID_SUPP_RATES, | |
197 | WLAN_EID_COUNTRY, | |
198 | WLAN_EID_EXT_SUPP_RATES, | |
199 | WLAN_EID_SUPPORTED_CHANNELS, | |
200 | WLAN_EID_RSN, | |
201 | }; | |
202 | noffset = ieee80211_ie_split(extra_ies, extra_ies_len, | |
203 | before_ext_cap, | |
204 | ARRAY_SIZE(before_ext_cap), | |
205 | offset); | |
206 | pos = skb_put(skb, noffset - offset); | |
207 | memcpy(pos, extra_ies + offset, noffset - offset); | |
208 | offset = noffset; | |
209 | } | |
210 | ||
211 | ieee80211_tdls_add_ext_capab(skb); | |
212 | ||
40b861a0 AN |
213 | /* add the QoS element if we support it */ |
214 | if (local->hw.queues >= IEEE80211_NUM_ACS && | |
215 | action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) | |
216 | ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */ | |
217 | ||
f09a87d2 AN |
218 | /* add any custom IEs that go before HT capabilities */ |
219 | if (extra_ies_len) { | |
220 | static const u8 before_ht_cap[] = { | |
221 | WLAN_EID_SUPP_RATES, | |
222 | WLAN_EID_COUNTRY, | |
223 | WLAN_EID_EXT_SUPP_RATES, | |
224 | WLAN_EID_SUPPORTED_CHANNELS, | |
225 | WLAN_EID_RSN, | |
226 | WLAN_EID_EXT_CAPABILITY, | |
227 | WLAN_EID_QOS_CAPA, | |
228 | WLAN_EID_FAST_BSS_TRANSITION, | |
229 | WLAN_EID_TIMEOUT_INTERVAL, | |
230 | WLAN_EID_SUPPORTED_REGULATORY_CLASSES, | |
231 | }; | |
232 | noffset = ieee80211_ie_split(extra_ies, extra_ies_len, | |
233 | before_ht_cap, | |
234 | ARRAY_SIZE(before_ht_cap), | |
235 | offset); | |
236 | pos = skb_put(skb, noffset - offset); | |
237 | memcpy(pos, extra_ies + offset, noffset - offset); | |
238 | offset = noffset; | |
239 | } | |
240 | ||
13cc8a4a AN |
241 | /* |
242 | * with TDLS we can switch channels, and HT-caps are not necessarily | |
243 | * the same on all bands. The specification limits the setup to a | |
244 | * single HT-cap, so use the current band for now. | |
245 | */ | |
246 | sband = local->hw.wiphy->bands[band]; | |
247 | memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); | |
248 | if ((action_code == WLAN_TDLS_SETUP_REQUEST || | |
249 | action_code == WLAN_TDLS_SETUP_RESPONSE) && | |
250 | ht_cap.ht_supported && (!sta || sta->sta.ht_cap.ht_supported)) { | |
251 | if (action_code == WLAN_TDLS_SETUP_REQUEST) { | |
252 | ieee80211_apply_htcap_overrides(sdata, &ht_cap); | |
253 | ||
254 | /* disable SMPS in TDLS initiator */ | |
255 | ht_cap.cap |= (WLAN_HT_CAP_SM_PS_DISABLED | |
256 | << IEEE80211_HT_CAP_SM_PS_SHIFT); | |
257 | } else { | |
258 | /* disable SMPS in TDLS responder */ | |
259 | sta->sta.ht_cap.cap |= | |
260 | (WLAN_HT_CAP_SM_PS_DISABLED | |
261 | << IEEE80211_HT_CAP_SM_PS_SHIFT); | |
262 | ||
263 | /* the peer caps are already intersected with our own */ | |
264 | memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap)); | |
265 | } | |
266 | ||
267 | pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); | |
268 | ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); | |
269 | } | |
270 | ||
271 | rcu_read_unlock(); | |
272 | ||
f09a87d2 AN |
273 | /* add any remaining IEs */ |
274 | if (extra_ies_len) { | |
275 | noffset = extra_ies_len; | |
276 | pos = skb_put(skb, noffset - offset); | |
277 | memcpy(pos, extra_ies + offset, noffset - offset); | |
278 | } | |
1606ef4a AN |
279 | |
280 | ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); | |
f09a87d2 AN |
281 | } |
282 | ||
6f7eaa47 AN |
283 | static void |
284 | ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata, | |
285 | struct sk_buff *skb, const u8 *peer, | |
286 | bool initiator, const u8 *extra_ies, | |
287 | size_t extra_ies_len) | |
288 | { | |
289 | struct ieee80211_local *local = sdata->local; | |
13cc8a4a | 290 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
6f7eaa47 | 291 | size_t offset = 0, noffset; |
13cc8a4a | 292 | struct sta_info *sta, *ap_sta; |
6f7eaa47 AN |
293 | u8 *pos; |
294 | ||
295 | rcu_read_lock(); | |
296 | ||
297 | sta = sta_info_get(sdata, peer); | |
13cc8a4a AN |
298 | ap_sta = sta_info_get(sdata, ifmgd->bssid); |
299 | if (WARN_ON_ONCE(!sta || !ap_sta)) { | |
6f7eaa47 AN |
300 | rcu_read_unlock(); |
301 | return; | |
302 | } | |
303 | ||
304 | /* add any custom IEs that go before the QoS IE */ | |
305 | if (extra_ies_len) { | |
306 | static const u8 before_qos[] = { | |
307 | WLAN_EID_RSN, | |
308 | }; | |
309 | noffset = ieee80211_ie_split(extra_ies, extra_ies_len, | |
310 | before_qos, | |
311 | ARRAY_SIZE(before_qos), | |
312 | offset); | |
313 | pos = skb_put(skb, noffset - offset); | |
314 | memcpy(pos, extra_ies + offset, noffset - offset); | |
315 | offset = noffset; | |
316 | } | |
317 | ||
318 | /* add the QoS param IE if both the peer and we support it */ | |
319 | if (local->hw.queues >= IEEE80211_NUM_ACS && | |
320 | test_sta_flag(sta, WLAN_STA_WME)) | |
321 | ieee80211_tdls_add_wmm_param_ie(sdata, skb); | |
322 | ||
13cc8a4a AN |
323 | /* add any custom IEs that go before HT operation */ |
324 | if (extra_ies_len) { | |
325 | static const u8 before_ht_op[] = { | |
326 | WLAN_EID_RSN, | |
327 | WLAN_EID_QOS_CAPA, | |
328 | WLAN_EID_FAST_BSS_TRANSITION, | |
329 | WLAN_EID_TIMEOUT_INTERVAL, | |
330 | }; | |
331 | noffset = ieee80211_ie_split(extra_ies, extra_ies_len, | |
332 | before_ht_op, | |
333 | ARRAY_SIZE(before_ht_op), | |
334 | offset); | |
335 | pos = skb_put(skb, noffset - offset); | |
336 | memcpy(pos, extra_ies + offset, noffset - offset); | |
337 | offset = noffset; | |
338 | } | |
339 | ||
340 | /* if HT support is only added in TDLS, we need an HT-operation IE */ | |
341 | if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { | |
342 | struct ieee80211_chanctx_conf *chanctx_conf = | |
343 | rcu_dereference(sdata->vif.chanctx_conf); | |
344 | if (!WARN_ON(!chanctx_conf)) { | |
345 | pos = skb_put(skb, 2 + | |
346 | sizeof(struct ieee80211_ht_operation)); | |
347 | /* send an empty HT operation IE */ | |
348 | ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap, | |
349 | &chanctx_conf->def, 0); | |
350 | } | |
351 | } | |
352 | ||
353 | rcu_read_unlock(); | |
354 | ||
6f7eaa47 AN |
355 | /* add any remaining IEs */ |
356 | if (extra_ies_len) { | |
357 | noffset = extra_ies_len; | |
358 | pos = skb_put(skb, noffset - offset); | |
359 | memcpy(pos, extra_ies + offset, noffset - offset); | |
360 | } | |
361 | ||
362 | ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); | |
6f7eaa47 AN |
363 | } |
364 | ||
46792a2d AN |
365 | static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata, |
366 | struct sk_buff *skb, const u8 *peer, | |
1606ef4a AN |
367 | u8 action_code, u16 status_code, |
368 | bool initiator, const u8 *extra_ies, | |
369 | size_t extra_ies_len) | |
46792a2d | 370 | { |
46792a2d AN |
371 | switch (action_code) { |
372 | case WLAN_TDLS_SETUP_REQUEST: | |
373 | case WLAN_TDLS_SETUP_RESPONSE: | |
374 | case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: | |
1606ef4a AN |
375 | if (status_code == 0) |
376 | ieee80211_tdls_add_setup_start_ies(sdata, skb, peer, | |
377 | action_code, | |
378 | initiator, | |
379 | extra_ies, | |
380 | extra_ies_len); | |
46792a2d AN |
381 | break; |
382 | case WLAN_TDLS_SETUP_CONFIRM: | |
6f7eaa47 AN |
383 | if (status_code == 0) |
384 | ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer, | |
385 | initiator, extra_ies, | |
386 | extra_ies_len); | |
387 | break; | |
46792a2d AN |
388 | case WLAN_TDLS_TEARDOWN: |
389 | case WLAN_TDLS_DISCOVERY_REQUEST: | |
f09a87d2 AN |
390 | if (extra_ies_len) |
391 | memcpy(skb_put(skb, extra_ies_len), extra_ies, | |
392 | extra_ies_len); | |
1606ef4a AN |
393 | if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN) |
394 | ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); | |
46792a2d AN |
395 | break; |
396 | } | |
397 | ||
46792a2d AN |
398 | } |
399 | ||
95224fe8 AN |
400 | static int |
401 | ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev, | |
3b3a0162 | 402 | const u8 *peer, u8 action_code, u8 dialog_token, |
95224fe8 AN |
403 | u16 status_code, struct sk_buff *skb) |
404 | { | |
405 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
95224fe8 AN |
406 | struct ieee80211_tdls_data *tf; |
407 | ||
408 | tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u)); | |
409 | ||
410 | memcpy(tf->da, peer, ETH_ALEN); | |
411 | memcpy(tf->sa, sdata->vif.addr, ETH_ALEN); | |
412 | tf->ether_type = cpu_to_be16(ETH_P_TDLS); | |
413 | tf->payload_type = WLAN_TDLS_SNAP_RFTYPE; | |
414 | ||
415 | switch (action_code) { | |
416 | case WLAN_TDLS_SETUP_REQUEST: | |
417 | tf->category = WLAN_CATEGORY_TDLS; | |
418 | tf->action_code = WLAN_TDLS_SETUP_REQUEST; | |
419 | ||
420 | skb_put(skb, sizeof(tf->u.setup_req)); | |
421 | tf->u.setup_req.dialog_token = dialog_token; | |
422 | tf->u.setup_req.capability = | |
dd8c0b03 AN |
423 | cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, |
424 | status_code)); | |
95224fe8 AN |
425 | break; |
426 | case WLAN_TDLS_SETUP_RESPONSE: | |
427 | tf->category = WLAN_CATEGORY_TDLS; | |
428 | tf->action_code = WLAN_TDLS_SETUP_RESPONSE; | |
429 | ||
430 | skb_put(skb, sizeof(tf->u.setup_resp)); | |
431 | tf->u.setup_resp.status_code = cpu_to_le16(status_code); | |
432 | tf->u.setup_resp.dialog_token = dialog_token; | |
433 | tf->u.setup_resp.capability = | |
dd8c0b03 AN |
434 | cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, |
435 | status_code)); | |
95224fe8 AN |
436 | break; |
437 | case WLAN_TDLS_SETUP_CONFIRM: | |
438 | tf->category = WLAN_CATEGORY_TDLS; | |
439 | tf->action_code = WLAN_TDLS_SETUP_CONFIRM; | |
440 | ||
441 | skb_put(skb, sizeof(tf->u.setup_cfm)); | |
442 | tf->u.setup_cfm.status_code = cpu_to_le16(status_code); | |
443 | tf->u.setup_cfm.dialog_token = dialog_token; | |
444 | break; | |
445 | case WLAN_TDLS_TEARDOWN: | |
446 | tf->category = WLAN_CATEGORY_TDLS; | |
447 | tf->action_code = WLAN_TDLS_TEARDOWN; | |
448 | ||
449 | skb_put(skb, sizeof(tf->u.teardown)); | |
450 | tf->u.teardown.reason_code = cpu_to_le16(status_code); | |
451 | break; | |
452 | case WLAN_TDLS_DISCOVERY_REQUEST: | |
453 | tf->category = WLAN_CATEGORY_TDLS; | |
454 | tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST; | |
455 | ||
456 | skb_put(skb, sizeof(tf->u.discover_req)); | |
457 | tf->u.discover_req.dialog_token = dialog_token; | |
458 | break; | |
459 | default: | |
460 | return -EINVAL; | |
461 | } | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
466 | static int | |
467 | ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev, | |
3b3a0162 | 468 | const u8 *peer, u8 action_code, u8 dialog_token, |
95224fe8 AN |
469 | u16 status_code, struct sk_buff *skb) |
470 | { | |
471 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
95224fe8 AN |
472 | struct ieee80211_mgmt *mgmt; |
473 | ||
474 | mgmt = (void *)skb_put(skb, 24); | |
475 | memset(mgmt, 0, 24); | |
476 | memcpy(mgmt->da, peer, ETH_ALEN); | |
477 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); | |
478 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
479 | ||
480 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
481 | IEEE80211_STYPE_ACTION); | |
482 | ||
483 | switch (action_code) { | |
484 | case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: | |
485 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp)); | |
486 | mgmt->u.action.category = WLAN_CATEGORY_PUBLIC; | |
487 | mgmt->u.action.u.tdls_discover_resp.action_code = | |
488 | WLAN_PUB_ACTION_TDLS_DISCOVER_RES; | |
489 | mgmt->u.action.u.tdls_discover_resp.dialog_token = | |
490 | dialog_token; | |
491 | mgmt->u.action.u.tdls_discover_resp.capability = | |
dd8c0b03 AN |
492 | cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, |
493 | status_code)); | |
95224fe8 AN |
494 | break; |
495 | default: | |
496 | return -EINVAL; | |
497 | } | |
498 | ||
499 | return 0; | |
500 | } | |
501 | ||
17e6a59a AN |
502 | static int |
503 | ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, | |
504 | const u8 *peer, u8 action_code, | |
505 | u8 dialog_token, u16 status_code, | |
2fb6b9b8 AN |
506 | u32 peer_capability, bool initiator, |
507 | const u8 *extra_ies, size_t extra_ies_len) | |
95224fe8 AN |
508 | { |
509 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
510 | struct ieee80211_local *local = sdata->local; | |
511 | struct sk_buff *skb = NULL; | |
512 | bool send_direct; | |
626911cc | 513 | struct sta_info *sta; |
95224fe8 AN |
514 | int ret; |
515 | ||
95224fe8 AN |
516 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + |
517 | max(sizeof(struct ieee80211_mgmt), | |
518 | sizeof(struct ieee80211_tdls_data)) + | |
519 | 50 + /* supported rates */ | |
520 | 7 + /* ext capab */ | |
40b861a0 | 521 | 26 + /* max(WMM-info, WMM-param) */ |
13cc8a4a AN |
522 | 2 + max(sizeof(struct ieee80211_ht_cap), |
523 | sizeof(struct ieee80211_ht_operation)) + | |
95224fe8 AN |
524 | extra_ies_len + |
525 | sizeof(struct ieee80211_tdls_lnkie)); | |
526 | if (!skb) | |
527 | return -ENOMEM; | |
528 | ||
529 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
530 | ||
531 | switch (action_code) { | |
532 | case WLAN_TDLS_SETUP_REQUEST: | |
533 | case WLAN_TDLS_SETUP_RESPONSE: | |
534 | case WLAN_TDLS_SETUP_CONFIRM: | |
535 | case WLAN_TDLS_TEARDOWN: | |
536 | case WLAN_TDLS_DISCOVERY_REQUEST: | |
537 | ret = ieee80211_prep_tdls_encap_data(wiphy, dev, peer, | |
538 | action_code, dialog_token, | |
539 | status_code, skb); | |
540 | send_direct = false; | |
541 | break; | |
542 | case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: | |
543 | ret = ieee80211_prep_tdls_direct(wiphy, dev, peer, action_code, | |
544 | dialog_token, status_code, | |
545 | skb); | |
546 | send_direct = true; | |
547 | break; | |
548 | default: | |
549 | ret = -ENOTSUPP; | |
550 | break; | |
551 | } | |
552 | ||
553 | if (ret < 0) | |
554 | goto fail; | |
555 | ||
626911cc AN |
556 | rcu_read_lock(); |
557 | sta = sta_info_get(sdata, peer); | |
558 | ||
559 | /* infer the initiator if we can, to support old userspace */ | |
95224fe8 AN |
560 | switch (action_code) { |
561 | case WLAN_TDLS_SETUP_REQUEST: | |
626911cc AN |
562 | if (sta) |
563 | set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); | |
564 | /* fall-through */ | |
95224fe8 | 565 | case WLAN_TDLS_SETUP_CONFIRM: |
95224fe8 | 566 | case WLAN_TDLS_DISCOVERY_REQUEST: |
626911cc | 567 | initiator = true; |
95224fe8 AN |
568 | break; |
569 | case WLAN_TDLS_SETUP_RESPONSE: | |
626911cc AN |
570 | /* |
571 | * In some testing scenarios, we send a request and response. | |
572 | * Make the last packet sent take effect for the initiator | |
573 | * value. | |
574 | */ | |
575 | if (sta) | |
576 | clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); | |
577 | /* fall-through */ | |
95224fe8 | 578 | case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: |
626911cc | 579 | initiator = false; |
2fb6b9b8 AN |
580 | break; |
581 | case WLAN_TDLS_TEARDOWN: | |
582 | /* any value is ok */ | |
95224fe8 AN |
583 | break; |
584 | default: | |
585 | ret = -ENOTSUPP; | |
626911cc | 586 | break; |
95224fe8 AN |
587 | } |
588 | ||
46792a2d AN |
589 | if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR)) |
590 | initiator = true; | |
2fb6b9b8 | 591 | |
626911cc AN |
592 | rcu_read_unlock(); |
593 | if (ret < 0) | |
594 | goto fail; | |
595 | ||
1606ef4a AN |
596 | ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code, |
597 | initiator, extra_ies, extra_ies_len); | |
95224fe8 AN |
598 | if (send_direct) { |
599 | ieee80211_tx_skb(sdata, skb); | |
600 | return 0; | |
601 | } | |
602 | ||
603 | /* | |
604 | * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise | |
605 | * we should default to AC_VI. | |
606 | */ | |
607 | switch (action_code) { | |
608 | case WLAN_TDLS_SETUP_REQUEST: | |
609 | case WLAN_TDLS_SETUP_RESPONSE: | |
610 | skb_set_queue_mapping(skb, IEEE80211_AC_BK); | |
611 | skb->priority = 2; | |
612 | break; | |
613 | default: | |
614 | skb_set_queue_mapping(skb, IEEE80211_AC_VI); | |
615 | skb->priority = 5; | |
616 | break; | |
617 | } | |
618 | ||
619 | /* disable bottom halves when entering the Tx path */ | |
620 | local_bh_disable(); | |
621 | ret = ieee80211_subif_start_xmit(skb, dev); | |
622 | local_bh_enable(); | |
623 | ||
624 | return ret; | |
625 | ||
626 | fail: | |
627 | dev_kfree_skb(skb); | |
628 | return ret; | |
629 | } | |
630 | ||
191dd469 AN |
631 | static int |
632 | ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, | |
633 | const u8 *peer, u8 action_code, u8 dialog_token, | |
634 | u16 status_code, u32 peer_capability, bool initiator, | |
635 | const u8 *extra_ies, size_t extra_ies_len) | |
17e6a59a AN |
636 | { |
637 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
638 | struct ieee80211_local *local = sdata->local; | |
639 | int ret; | |
640 | ||
17e6a59a AN |
641 | mutex_lock(&local->mtx); |
642 | ||
643 | /* we don't support concurrent TDLS peer setups */ | |
81dd2b88 AN |
644 | if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && |
645 | !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { | |
17e6a59a AN |
646 | ret = -EBUSY; |
647 | goto exit; | |
648 | } | |
649 | ||
7adc3e46 AN |
650 | /* |
651 | * make sure we have a STA representing the peer so we drop or buffer | |
652 | * non-TDLS-setup frames to the peer. We can't send other packets | |
6ae32e5d AN |
653 | * during setup through the AP path. |
654 | * Allow error packets to be sent - sometimes we don't even add a STA | |
655 | * before failing the setup. | |
7adc3e46 | 656 | */ |
6ae32e5d AN |
657 | if (status_code == 0) { |
658 | rcu_read_lock(); | |
659 | if (!sta_info_get(sdata, peer)) { | |
660 | rcu_read_unlock(); | |
661 | ret = -ENOLINK; | |
662 | goto exit; | |
663 | } | |
7adc3e46 | 664 | rcu_read_unlock(); |
7adc3e46 | 665 | } |
7adc3e46 | 666 | |
db67d661 AN |
667 | ieee80211_flush_queues(local, sdata); |
668 | ||
17e6a59a AN |
669 | ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, |
670 | dialog_token, status_code, | |
2fb6b9b8 AN |
671 | peer_capability, initiator, |
672 | extra_ies, extra_ies_len); | |
17e6a59a AN |
673 | if (ret < 0) |
674 | goto exit; | |
675 | ||
81dd2b88 | 676 | memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); |
191dd469 | 677 | ieee80211_queue_delayed_work(&sdata->local->hw, |
81dd2b88 | 678 | &sdata->u.mgd.tdls_peer_del_work, |
191dd469 | 679 | TDLS_PEER_SETUP_TIMEOUT); |
17e6a59a AN |
680 | |
681 | exit: | |
682 | mutex_unlock(&local->mtx); | |
191dd469 AN |
683 | return ret; |
684 | } | |
685 | ||
db67d661 AN |
686 | static int |
687 | ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, | |
688 | const u8 *peer, u8 action_code, u8 dialog_token, | |
689 | u16 status_code, u32 peer_capability, | |
690 | bool initiator, const u8 *extra_ies, | |
691 | size_t extra_ies_len) | |
692 | { | |
693 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
694 | struct ieee80211_local *local = sdata->local; | |
695 | struct sta_info *sta; | |
696 | int ret; | |
697 | ||
698 | /* | |
699 | * No packets can be transmitted to the peer via the AP during setup - | |
700 | * the STA is set as a TDLS peer, but is not authorized. | |
701 | * During teardown, we prevent direct transmissions by stopping the | |
702 | * queues and flushing all direct packets. | |
703 | */ | |
704 | ieee80211_stop_vif_queues(local, sdata, | |
705 | IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); | |
706 | ieee80211_flush_queues(local, sdata); | |
707 | ||
708 | ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, | |
709 | dialog_token, status_code, | |
710 | peer_capability, initiator, | |
711 | extra_ies, extra_ies_len); | |
712 | if (ret < 0) | |
713 | sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", | |
714 | ret); | |
715 | ||
716 | /* | |
717 | * Remove the STA AUTH flag to force further traffic through the AP. If | |
718 | * the STA was unreachable, it was already removed. | |
719 | */ | |
720 | rcu_read_lock(); | |
721 | sta = sta_info_get(sdata, peer); | |
722 | if (sta) | |
723 | clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); | |
724 | rcu_read_unlock(); | |
725 | ||
726 | ieee80211_wake_vif_queues(local, sdata, | |
727 | IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); | |
728 | ||
729 | return 0; | |
730 | } | |
731 | ||
191dd469 AN |
732 | int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, |
733 | const u8 *peer, u8 action_code, u8 dialog_token, | |
734 | u16 status_code, u32 peer_capability, | |
735 | bool initiator, const u8 *extra_ies, | |
736 | size_t extra_ies_len) | |
737 | { | |
738 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
739 | int ret; | |
740 | ||
741 | if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) | |
742 | return -ENOTSUPP; | |
743 | ||
744 | /* make sure we are in managed mode, and associated */ | |
745 | if (sdata->vif.type != NL80211_IFTYPE_STATION || | |
746 | !sdata->u.mgd.associated) | |
747 | return -EINVAL; | |
748 | ||
749 | switch (action_code) { | |
750 | case WLAN_TDLS_SETUP_REQUEST: | |
751 | case WLAN_TDLS_SETUP_RESPONSE: | |
752 | ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code, | |
753 | dialog_token, status_code, | |
754 | peer_capability, initiator, | |
755 | extra_ies, extra_ies_len); | |
756 | break; | |
757 | case WLAN_TDLS_TEARDOWN: | |
db67d661 AN |
758 | ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, |
759 | action_code, dialog_token, | |
760 | status_code, | |
761 | peer_capability, initiator, | |
762 | extra_ies, extra_ies_len); | |
763 | break; | |
191dd469 | 764 | case WLAN_TDLS_DISCOVERY_REQUEST: |
ee10f2c7 AN |
765 | /* |
766 | * Protect the discovery so we can hear the TDLS discovery | |
767 | * response frame. It is transmitted directly and not buffered | |
768 | * by the AP. | |
769 | */ | |
770 | drv_mgd_protect_tdls_discover(sdata->local, sdata); | |
771 | /* fall-through */ | |
772 | case WLAN_TDLS_SETUP_CONFIRM: | |
191dd469 AN |
773 | case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: |
774 | /* no special handling */ | |
775 | ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, | |
776 | action_code, | |
777 | dialog_token, | |
778 | status_code, | |
779 | peer_capability, | |
780 | initiator, extra_ies, | |
781 | extra_ies_len); | |
782 | break; | |
783 | default: | |
784 | ret = -EOPNOTSUPP; | |
785 | break; | |
786 | } | |
17e6a59a AN |
787 | |
788 | tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n", | |
789 | action_code, peer, ret); | |
790 | return ret; | |
791 | } | |
792 | ||
95224fe8 | 793 | int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, |
3b3a0162 | 794 | const u8 *peer, enum nl80211_tdls_operation oper) |
95224fe8 AN |
795 | { |
796 | struct sta_info *sta; | |
797 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
17e6a59a AN |
798 | struct ieee80211_local *local = sdata->local; |
799 | int ret; | |
95224fe8 AN |
800 | |
801 | if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) | |
802 | return -ENOTSUPP; | |
803 | ||
804 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
805 | return -EINVAL; | |
806 | ||
17e6a59a AN |
807 | switch (oper) { |
808 | case NL80211_TDLS_ENABLE_LINK: | |
809 | case NL80211_TDLS_DISABLE_LINK: | |
810 | break; | |
811 | case NL80211_TDLS_TEARDOWN: | |
812 | case NL80211_TDLS_SETUP: | |
813 | case NL80211_TDLS_DISCOVERY_REQ: | |
814 | /* We don't support in-driver setup/teardown/discovery */ | |
815 | return -ENOTSUPP; | |
816 | } | |
817 | ||
818 | mutex_lock(&local->mtx); | |
95224fe8 AN |
819 | tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); |
820 | ||
821 | switch (oper) { | |
822 | case NL80211_TDLS_ENABLE_LINK: | |
823 | rcu_read_lock(); | |
824 | sta = sta_info_get(sdata, peer); | |
825 | if (!sta) { | |
826 | rcu_read_unlock(); | |
17e6a59a AN |
827 | ret = -ENOLINK; |
828 | break; | |
95224fe8 AN |
829 | } |
830 | ||
831 | set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); | |
832 | rcu_read_unlock(); | |
17e6a59a | 833 | |
81dd2b88 AN |
834 | WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || |
835 | !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); | |
17e6a59a | 836 | ret = 0; |
95224fe8 AN |
837 | break; |
838 | case NL80211_TDLS_DISABLE_LINK: | |
bb3f8486 LK |
839 | /* |
840 | * The teardown message in ieee80211_tdls_mgmt_teardown() was | |
841 | * created while the queues were stopped, so it might still be | |
842 | * pending. Before flushing the queues we need to be sure the | |
843 | * message is handled by the tasklet handling pending messages, | |
844 | * otherwise we might start destroying the station before | |
845 | * sending the teardown packet. | |
846 | * Note that this only forces the tasklet to flush pendings - | |
847 | * not to stop the tasklet from rescheduling itself. | |
848 | */ | |
849 | tasklet_kill(&local->tx_pending_tasklet); | |
db67d661 AN |
850 | /* flush a potentially queued teardown packet */ |
851 | ieee80211_flush_queues(local, sdata); | |
852 | ||
17e6a59a AN |
853 | ret = sta_info_destroy_addr(sdata, peer); |
854 | break; | |
95224fe8 | 855 | default: |
17e6a59a AN |
856 | ret = -ENOTSUPP; |
857 | break; | |
95224fe8 AN |
858 | } |
859 | ||
81dd2b88 AN |
860 | if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { |
861 | cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work); | |
862 | eth_zero_addr(sdata->u.mgd.tdls_peer); | |
17e6a59a AN |
863 | } |
864 | ||
865 | mutex_unlock(&local->mtx); | |
866 | return ret; | |
95224fe8 | 867 | } |
c887f0d3 AN |
868 | |
869 | void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, | |
870 | enum nl80211_tdls_operation oper, | |
871 | u16 reason_code, gfp_t gfp) | |
872 | { | |
873 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
874 | ||
875 | if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) { | |
876 | sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", | |
877 | oper); | |
878 | return; | |
879 | } | |
880 | ||
881 | cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); | |
882 | } | |
883 | EXPORT_SYMBOL(ieee80211_tdls_oper_request); |