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alpha: use Kbuild logic to include <asm-generic/sections.h>
[linux-2.6/btrfs-unstable.git] / net / mac80211 / tdls.c
blob4ea25dec06984792234f4a77edc1e26c157b0662
1 /*
2 * mac80211 TDLS handling code
3 *
4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2014, Intel Corporation
6 * Copyright 2014 Intel Mobile Communications GmbH
7 *
8 * This file is GPLv2 as found in COPYING.
9 */
10
11 #include <linux/ieee80211.h>
12 #include <linux/log2.h>
13 #include <net/cfg80211.h>
14 #include "ieee80211_i.h"
15 #include "driver-ops.h"
16
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,
26 u.mgd.tdls_peer_del_work.work);
27 local = sdata->local;
28
29 mutex_lock(&local->mtx);
30 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) {
31 tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer);
32 sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer);
33 eth_zero_addr(sdata->u.mgd.tdls_peer);
34 }
35 mutex_unlock(&local->mtx);
36 }
37
38 static void ieee80211_tdls_add_ext_capab(struct sk_buff *skb)
39 {
40 u8 *pos = (void *)skb_put(skb, 7);
41
42 *pos++ = WLAN_EID_EXT_CAPABILITY;
43 *pos++ = 5; /* len */
44 *pos++ = 0x0;
45 *pos++ = 0x0;
46 *pos++ = 0x0;
47 *pos++ = 0x0;
48 *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
49 }
50
51 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
52 u16 status_code)
53 {
54 struct ieee80211_local *local = sdata->local;
55 u16 capab;
56
57 /* The capability will be 0 when sending a failure code */
58 if (status_code != 0)
59 return 0;
60
61 capab = 0;
62 if (ieee80211_get_sdata_band(sdata) != IEEE80211_BAND_2GHZ)
63 return capab;
64
65 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
66 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
67 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
68 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
69
70 return capab;
71 }
72
73 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
74 struct sk_buff *skb, const u8 *peer,
75 bool initiator)
76 {
77 struct ieee80211_tdls_lnkie *lnkid;
78 const u8 *init_addr, *rsp_addr;
79
80 if (initiator) {
81 init_addr = sdata->vif.addr;
82 rsp_addr = peer;
83 } else {
84 init_addr = peer;
85 rsp_addr = sdata->vif.addr;
86 }
87
88 lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
89
90 lnkid->ie_type = WLAN_EID_LINK_ID;
91 lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
92
93 memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN);
94 memcpy(lnkid->init_sta, init_addr, ETH_ALEN);
95 memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN);
96 }
97
98 /* translate numbering in the WMM parameter IE to the mac80211 notation */
99 static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac)
100 {
101 switch (ac) {
102 default:
103 WARN_ON_ONCE(1);
104 case 0:
105 return IEEE80211_AC_BE;
106 case 1:
107 return IEEE80211_AC_BK;
108 case 2:
109 return IEEE80211_AC_VI;
110 case 3:
111 return IEEE80211_AC_VO;
112 }
113 }
114
115 static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci)
116 {
117 u8 ret;
118
119 ret = aifsn & 0x0f;
120 if (acm)
121 ret |= 0x10;
122 ret |= (aci << 5) & 0x60;
123 return ret;
124 }
125
126 static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max)
127 {
128 return ((ilog2(cw_min + 1) << 0x0) & 0x0f) |
129 ((ilog2(cw_max + 1) << 0x4) & 0xf0);
130 }
131
132 static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata,
133 struct sk_buff *skb)
134 {
135 struct ieee80211_wmm_param_ie *wmm;
136 struct ieee80211_tx_queue_params *txq;
137 int i;
138
139 wmm = (void *)skb_put(skb, sizeof(*wmm));
140 memset(wmm, 0, sizeof(*wmm));
141
142 wmm->element_id = WLAN_EID_VENDOR_SPECIFIC;
143 wmm->len = sizeof(*wmm) - 2;
144
145 wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */
146 wmm->oui[1] = 0x50;
147 wmm->oui[2] = 0xf2;
148 wmm->oui_type = 2; /* WME */
149 wmm->oui_subtype = 1; /* WME param */
150 wmm->version = 1; /* WME ver */
151 wmm->qos_info = 0; /* U-APSD not in use */
152
153 /*
154 * Use the EDCA parameters defined for the BSS, or default if the AP
155 * doesn't support it, as mandated by 802.11-2012 section 10.22.4
156 */
157 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
158 txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)];
159 wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs,
160 txq->acm, i);
161 wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max);
162 wmm->ac[i].txop_limit = cpu_to_le16(txq->txop);
163 }
164 }
165
166 static void
167 ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
168 struct sk_buff *skb, const u8 *peer,
169 u8 action_code, bool initiator,
170 const u8 *extra_ies, size_t extra_ies_len)
171 {
172 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
173 struct ieee80211_local *local = sdata->local;
174 struct ieee80211_supported_band *sband;
175 struct ieee80211_sta_ht_cap ht_cap;
176 struct sta_info *sta = NULL;
177 size_t offset = 0, noffset;
178 u8 *pos;
179
180 rcu_read_lock();
181
182 /* we should have the peer STA if we're already responding */
183 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
184 sta = sta_info_get(sdata, peer);
185 if (WARN_ON_ONCE(!sta)) {
186 rcu_read_unlock();
187 return;
188 }
189 }
190
191 ieee80211_add_srates_ie(sdata, skb, false, band);
192 ieee80211_add_ext_srates_ie(sdata, skb, false, band);
193
194 /* add any custom IEs that go before Extended Capabilities */
195 if (extra_ies_len) {
196 static const u8 before_ext_cap[] = {
197 WLAN_EID_SUPP_RATES,
198 WLAN_EID_COUNTRY,
199 WLAN_EID_EXT_SUPP_RATES,
200 WLAN_EID_SUPPORTED_CHANNELS,
201 WLAN_EID_RSN,
202 };
203 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
204 before_ext_cap,
205 ARRAY_SIZE(before_ext_cap),
206 offset);
207 pos = skb_put(skb, noffset - offset);
208 memcpy(pos, extra_ies + offset, noffset - offset);
209 offset = noffset;
210 }
211
212 ieee80211_tdls_add_ext_capab(skb);
213
214 /* add the QoS element if we support it */
215 if (local->hw.queues >= IEEE80211_NUM_ACS &&
216 action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES)
217 ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */
218
219 /* add any custom IEs that go before HT capabilities */
220 if (extra_ies_len) {
221 static const u8 before_ht_cap[] = {
222 WLAN_EID_SUPP_RATES,
223 WLAN_EID_COUNTRY,
224 WLAN_EID_EXT_SUPP_RATES,
225 WLAN_EID_SUPPORTED_CHANNELS,
226 WLAN_EID_RSN,
227 WLAN_EID_EXT_CAPABILITY,
228 WLAN_EID_QOS_CAPA,
229 WLAN_EID_FAST_BSS_TRANSITION,
230 WLAN_EID_TIMEOUT_INTERVAL,
231 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
232 };
233 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
234 before_ht_cap,
235 ARRAY_SIZE(before_ht_cap),
236 offset);
237 pos = skb_put(skb, noffset - offset);
238 memcpy(pos, extra_ies + offset, noffset - offset);
239 offset = noffset;
240 }
241
242 /*
243 * with TDLS we can switch channels, and HT-caps are not necessarily
244 * the same on all bands. The specification limits the setup to a
245 * single HT-cap, so use the current band for now.
246 */
247 sband = local->hw.wiphy->bands[band];
248 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
249 if ((action_code == WLAN_TDLS_SETUP_REQUEST ||
250 action_code == WLAN_TDLS_SETUP_RESPONSE) &&
251 ht_cap.ht_supported && (!sta || sta->sta.ht_cap.ht_supported)) {
252 if (action_code == WLAN_TDLS_SETUP_REQUEST) {
253 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
254
255 /* disable SMPS in TDLS initiator */
256 ht_cap.cap |= (WLAN_HT_CAP_SM_PS_DISABLED
257 << IEEE80211_HT_CAP_SM_PS_SHIFT);
258 } else {
259 /* disable SMPS in TDLS responder */
260 sta->sta.ht_cap.cap |=
261 (WLAN_HT_CAP_SM_PS_DISABLED
262 << IEEE80211_HT_CAP_SM_PS_SHIFT);
263
264 /* the peer caps are already intersected with our own */
265 memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap));
266 }
267
268 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
269 ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
270 }
271
272 rcu_read_unlock();
273
274 /* add any remaining IEs */
275 if (extra_ies_len) {
276 noffset = extra_ies_len;
277 pos = skb_put(skb, noffset - offset);
278 memcpy(pos, extra_ies + offset, noffset - offset);
279 }
280
281 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
282 }
283
284 static void
285 ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
286 struct sk_buff *skb, const u8 *peer,
287 bool initiator, const u8 *extra_ies,
288 size_t extra_ies_len)
289 {
290 struct ieee80211_local *local = sdata->local;
291 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
292 size_t offset = 0, noffset;
293 struct sta_info *sta, *ap_sta;
294 u8 *pos;
295
296 rcu_read_lock();
297
298 sta = sta_info_get(sdata, peer);
299 ap_sta = sta_info_get(sdata, ifmgd->bssid);
300 if (WARN_ON_ONCE(!sta || !ap_sta)) {
301 rcu_read_unlock();
302 return;
303 }
304
305 /* add any custom IEs that go before the QoS IE */
306 if (extra_ies_len) {
307 static const u8 before_qos[] = {
308 WLAN_EID_RSN,
309 };
310 noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
311 before_qos,
312 ARRAY_SIZE(before_qos),
313 offset);
314 pos = skb_put(skb, noffset - offset);
315 memcpy(pos, extra_ies + offset, noffset - offset);
316 offset = noffset;
317 }
318
319 /* add the QoS param IE if both the peer and we support it */
320 if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
321 ieee80211_tdls_add_wmm_param_ie(sdata, skb);
322
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
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);
363 }
364
365 static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
366 struct sk_buff *skb, const u8 *peer,
367 u8 action_code, u16 status_code,
368 bool initiator, const u8 *extra_ies,
369 size_t extra_ies_len)
370 {
371 switch (action_code) {
372 case WLAN_TDLS_SETUP_REQUEST:
373 case WLAN_TDLS_SETUP_RESPONSE:
374 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
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);
381 break;
382 case WLAN_TDLS_SETUP_CONFIRM:
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;
388 case WLAN_TDLS_TEARDOWN:
389 case WLAN_TDLS_DISCOVERY_REQUEST:
390 if (extra_ies_len)
391 memcpy(skb_put(skb, extra_ies_len), extra_ies,
392 extra_ies_len);
393 if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
394 ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
395 break;
396 }
397
398 }
399
400 static int
401 ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
402 const u8 *peer, u8 action_code, u8 dialog_token,
403 u16 status_code, struct sk_buff *skb)
404 {
405 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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 /* network header is after the ethernet header */
416 skb_set_network_header(skb, ETH_HLEN);
417
418 switch (action_code) {
419 case WLAN_TDLS_SETUP_REQUEST:
420 tf->category = WLAN_CATEGORY_TDLS;
421 tf->action_code = WLAN_TDLS_SETUP_REQUEST;
422
423 skb_put(skb, sizeof(tf->u.setup_req));
424 tf->u.setup_req.dialog_token = dialog_token;
425 tf->u.setup_req.capability =
426 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
427 status_code));
428 break;
429 case WLAN_TDLS_SETUP_RESPONSE:
430 tf->category = WLAN_CATEGORY_TDLS;
431 tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
432
433 skb_put(skb, sizeof(tf->u.setup_resp));
434 tf->u.setup_resp.status_code = cpu_to_le16(status_code);
435 tf->u.setup_resp.dialog_token = dialog_token;
436 tf->u.setup_resp.capability =
437 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
438 status_code));
439 break;
440 case WLAN_TDLS_SETUP_CONFIRM:
441 tf->category = WLAN_CATEGORY_TDLS;
442 tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
443
444 skb_put(skb, sizeof(tf->u.setup_cfm));
445 tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
446 tf->u.setup_cfm.dialog_token = dialog_token;
447 break;
448 case WLAN_TDLS_TEARDOWN:
449 tf->category = WLAN_CATEGORY_TDLS;
450 tf->action_code = WLAN_TDLS_TEARDOWN;
451
452 skb_put(skb, sizeof(tf->u.teardown));
453 tf->u.teardown.reason_code = cpu_to_le16(status_code);
454 break;
455 case WLAN_TDLS_DISCOVERY_REQUEST:
456 tf->category = WLAN_CATEGORY_TDLS;
457 tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
458
459 skb_put(skb, sizeof(tf->u.discover_req));
460 tf->u.discover_req.dialog_token = dialog_token;
461 break;
462 default:
463 return -EINVAL;
464 }
465
466 return 0;
467 }
468
469 static int
470 ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
471 const u8 *peer, u8 action_code, u8 dialog_token,
472 u16 status_code, struct sk_buff *skb)
473 {
474 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
475 struct ieee80211_mgmt *mgmt;
476
477 mgmt = (void *)skb_put(skb, 24);
478 memset(mgmt, 0, 24);
479 memcpy(mgmt->da, peer, ETH_ALEN);
480 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
481 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
482
483 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
484 IEEE80211_STYPE_ACTION);
485
486 switch (action_code) {
487 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
488 skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
489 mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
490 mgmt->u.action.u.tdls_discover_resp.action_code =
491 WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
492 mgmt->u.action.u.tdls_discover_resp.dialog_token =
493 dialog_token;
494 mgmt->u.action.u.tdls_discover_resp.capability =
495 cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata,
496 status_code));
497 break;
498 default:
499 return -EINVAL;
500 }
501
502 return 0;
503 }
504
505 static int
506 ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
507 const u8 *peer, u8 action_code,
508 u8 dialog_token, u16 status_code,
509 u32 peer_capability, bool initiator,
510 const u8 *extra_ies, size_t extra_ies_len)
511 {
512 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
513 struct ieee80211_local *local = sdata->local;
514 struct sk_buff *skb = NULL;
515 bool send_direct;
516 struct sta_info *sta;
517 int ret;
518
519 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
520 max(sizeof(struct ieee80211_mgmt),
521 sizeof(struct ieee80211_tdls_data)) +
522 50 + /* supported rates */
523 7 + /* ext capab */
524 26 + /* max(WMM-info, WMM-param) */
525 2 + max(sizeof(struct ieee80211_ht_cap),
526 sizeof(struct ieee80211_ht_operation)) +
527 extra_ies_len +
528 sizeof(struct ieee80211_tdls_lnkie));
529 if (!skb)
530 return -ENOMEM;
531
532 skb_reserve(skb, local->hw.extra_tx_headroom);
533
534 switch (action_code) {
535 case WLAN_TDLS_SETUP_REQUEST:
536 case WLAN_TDLS_SETUP_RESPONSE:
537 case WLAN_TDLS_SETUP_CONFIRM:
538 case WLAN_TDLS_TEARDOWN:
539 case WLAN_TDLS_DISCOVERY_REQUEST:
540 ret = ieee80211_prep_tdls_encap_data(wiphy, dev, peer,
541 action_code, dialog_token,
542 status_code, skb);
543 send_direct = false;
544 break;
545 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
546 ret = ieee80211_prep_tdls_direct(wiphy, dev, peer, action_code,
547 dialog_token, status_code,
548 skb);
549 send_direct = true;
550 break;
551 default:
552 ret = -ENOTSUPP;
553 break;
554 }
555
556 if (ret < 0)
557 goto fail;
558
559 rcu_read_lock();
560 sta = sta_info_get(sdata, peer);
561
562 /* infer the initiator if we can, to support old userspace */
563 switch (action_code) {
564 case WLAN_TDLS_SETUP_REQUEST:
565 if (sta)
566 set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
567 /* fall-through */
568 case WLAN_TDLS_SETUP_CONFIRM:
569 case WLAN_TDLS_DISCOVERY_REQUEST:
570 initiator = true;
571 break;
572 case WLAN_TDLS_SETUP_RESPONSE:
573 /*
574 * In some testing scenarios, we send a request and response.
575 * Make the last packet sent take effect for the initiator
576 * value.
577 */
578 if (sta)
579 clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR);
580 /* fall-through */
581 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
582 initiator = false;
583 break;
584 case WLAN_TDLS_TEARDOWN:
585 /* any value is ok */
586 break;
587 default:
588 ret = -ENOTSUPP;
589 break;
590 }
591
592 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR))
593 initiator = true;
594
595 rcu_read_unlock();
596 if (ret < 0)
597 goto fail;
598
599 ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code,
600 initiator, extra_ies, extra_ies_len);
601 if (send_direct) {
602 ieee80211_tx_skb(sdata, skb);
603 return 0;
604 }
605
606 /*
607 * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
608 * we should default to AC_VI.
609 */
610 switch (action_code) {
611 case WLAN_TDLS_SETUP_REQUEST:
612 case WLAN_TDLS_SETUP_RESPONSE:
613 skb_set_queue_mapping(skb, IEEE80211_AC_BK);
614 skb->priority = 2;
615 break;
616 default:
617 skb_set_queue_mapping(skb, IEEE80211_AC_VI);
618 skb->priority = 5;
619 break;
620 }
621
622 /* disable bottom halves when entering the Tx path */
623 local_bh_disable();
624 ret = ieee80211_subif_start_xmit(skb, dev);
625 local_bh_enable();
626
627 return ret;
628
629 fail:
630 dev_kfree_skb(skb);
631 return ret;
632 }
633
634 static int
635 ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev,
636 const u8 *peer, u8 action_code, u8 dialog_token,
637 u16 status_code, u32 peer_capability, bool initiator,
638 const u8 *extra_ies, size_t extra_ies_len)
639 {
640 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
641 struct ieee80211_local *local = sdata->local;
642 int ret;
643
644 mutex_lock(&local->mtx);
645
646 /* we don't support concurrent TDLS peer setups */
647 if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) &&
648 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
649 ret = -EBUSY;
650 goto exit;
651 }
652
653 /*
654 * make sure we have a STA representing the peer so we drop or buffer
655 * non-TDLS-setup frames to the peer. We can't send other packets
656 * during setup through the AP path.
657 * Allow error packets to be sent - sometimes we don't even add a STA
658 * before failing the setup.
659 */
660 if (status_code == 0) {
661 rcu_read_lock();
662 if (!sta_info_get(sdata, peer)) {
663 rcu_read_unlock();
664 ret = -ENOLINK;
665 goto exit;
666 }
667 rcu_read_unlock();
668 }
669
670 ieee80211_flush_queues(local, sdata);
671
672 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
673 dialog_token, status_code,
674 peer_capability, initiator,
675 extra_ies, extra_ies_len);
676 if (ret < 0)
677 goto exit;
678
679 memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN);
680 ieee80211_queue_delayed_work(&sdata->local->hw,
681 &sdata->u.mgd.tdls_peer_del_work,
682 TDLS_PEER_SETUP_TIMEOUT);
683
684 exit:
685 mutex_unlock(&local->mtx);
686 return ret;
687 }
688
689 static int
690 ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,
691 const u8 *peer, u8 action_code, u8 dialog_token,
692 u16 status_code, u32 peer_capability,
693 bool initiator, const u8 *extra_ies,
694 size_t extra_ies_len)
695 {
696 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
697 struct ieee80211_local *local = sdata->local;
698 struct sta_info *sta;
699 int ret;
700
701 /*
702 * No packets can be transmitted to the peer via the AP during setup -
703 * the STA is set as a TDLS peer, but is not authorized.
704 * During teardown, we prevent direct transmissions by stopping the
705 * queues and flushing all direct packets.
706 */
707 ieee80211_stop_vif_queues(local, sdata,
708 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
709 ieee80211_flush_queues(local, sdata);
710
711 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,
712 dialog_token, status_code,
713 peer_capability, initiator,
714 extra_ies, extra_ies_len);
715 if (ret < 0)
716 sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",
717 ret);
718
719 /*
720 * Remove the STA AUTH flag to force further traffic through the AP. If
721 * the STA was unreachable, it was already removed.
722 */
723 rcu_read_lock();
724 sta = sta_info_get(sdata, peer);
725 if (sta)
726 clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
727 rcu_read_unlock();
728
729 ieee80211_wake_vif_queues(local, sdata,
730 IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);
731
732 return 0;
733 }
734
735 int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
736 const u8 *peer, u8 action_code, u8 dialog_token,
737 u16 status_code, u32 peer_capability,
738 bool initiator, const u8 *extra_ies,
739 size_t extra_ies_len)
740 {
741 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
742 int ret;
743
744 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
745 return -ENOTSUPP;
746
747 /* make sure we are in managed mode, and associated */
748 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
749 !sdata->u.mgd.associated)
750 return -EINVAL;
751
752 switch (action_code) {
753 case WLAN_TDLS_SETUP_REQUEST:
754 case WLAN_TDLS_SETUP_RESPONSE:
755 ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code,
756 dialog_token, status_code,
757 peer_capability, initiator,
758 extra_ies, extra_ies_len);
759 break;
760 case WLAN_TDLS_TEARDOWN:
761 ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,
762 action_code, dialog_token,
763 status_code,
764 peer_capability, initiator,
765 extra_ies, extra_ies_len);
766 break;
767 case WLAN_TDLS_DISCOVERY_REQUEST:
768 /*
769 * Protect the discovery so we can hear the TDLS discovery
770 * response frame. It is transmitted directly and not buffered
771 * by the AP.
772 */
773 drv_mgd_protect_tdls_discover(sdata->local, sdata);
774 /* fall-through */
775 case WLAN_TDLS_SETUP_CONFIRM:
776 case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
777 /* no special handling */
778 ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer,
779 action_code,
780 dialog_token,
781 status_code,
782 peer_capability,
783 initiator, extra_ies,
784 extra_ies_len);
785 break;
786 default:
787 ret = -EOPNOTSUPP;
788 break;
789 }
790
791 tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",
792 action_code, peer, ret);
793 return ret;
794 }
795
796 int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
797 const u8 *peer, enum nl80211_tdls_operation oper)
798 {
799 struct sta_info *sta;
800 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
801 struct ieee80211_local *local = sdata->local;
802 int ret;
803
804 if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
805 return -ENOTSUPP;
806
807 if (sdata->vif.type != NL80211_IFTYPE_STATION)
808 return -EINVAL;
809
810 switch (oper) {
811 case NL80211_TDLS_ENABLE_LINK:
812 case NL80211_TDLS_DISABLE_LINK:
813 break;
814 case NL80211_TDLS_TEARDOWN:
815 case NL80211_TDLS_SETUP:
816 case NL80211_TDLS_DISCOVERY_REQ:
817 /* We don't support in-driver setup/teardown/discovery */
818 return -ENOTSUPP;
819 }
820
821 mutex_lock(&local->mtx);
822 tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
823
824 switch (oper) {
825 case NL80211_TDLS_ENABLE_LINK:
826 rcu_read_lock();
827 sta = sta_info_get(sdata, peer);
828 if (!sta) {
829 rcu_read_unlock();
830 ret = -ENOLINK;
831 break;
832 }
833
834 set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
835 rcu_read_unlock();
836
837 WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) ||
838 !ether_addr_equal(sdata->u.mgd.tdls_peer, peer));
839 ret = 0;
840 break;
841 case NL80211_TDLS_DISABLE_LINK:
842 /*
843 * The teardown message in ieee80211_tdls_mgmt_teardown() was
844 * created while the queues were stopped, so it might still be
845 * pending. Before flushing the queues we need to be sure the
846 * message is handled by the tasklet handling pending messages,
847 * otherwise we might start destroying the station before
848 * sending the teardown packet.
849 * Note that this only forces the tasklet to flush pendings -
850 * not to stop the tasklet from rescheduling itself.
851 */
852 tasklet_kill(&local->tx_pending_tasklet);
853 /* flush a potentially queued teardown packet */
854 ieee80211_flush_queues(local, sdata);
855
856 ret = sta_info_destroy_addr(sdata, peer);
857 break;
858 default:
859 ret = -ENOTSUPP;
860 break;
861 }
862
863 if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) {
864 cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work);
865 eth_zero_addr(sdata->u.mgd.tdls_peer);
866 }
867
868 mutex_unlock(&local->mtx);
869 return ret;
870 }
871
872 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
873 enum nl80211_tdls_operation oper,
874 u16 reason_code, gfp_t gfp)
875 {
876 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
877
878 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) {
879 sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n",
880 oper);
881 return;
882 }
883
884 cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
885 }
886 EXPORT_SYMBOL(ieee80211_tdls_oper_request);
(deprecated) Btrfs devel tree