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1 | /* |
2 | * HT handling |
3 | * |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> |
5 | * Copyright 2002-2005, Instant802 Networks, Inc. |
6 | * Copyright 2005-2006, Devicescape Software, Inc. |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> |
9 | * Copyright 2007-2010, Intel Corporation |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify |
12 | * it under the terms of the GNU General Public License version 2 as |
13 | * published by the Free Software Foundation. |
14 | */ |
15 | |
16 | #include <linux/ieee80211.h> |
17 | #include <linux/export.h> |
18 | #include <net/mac80211.h> |
19 | #include "ieee80211_i.h" |
20 | #include "rate.h" |
21 | |
22 | static void __check_htcap_disable(struct ieee80211_sub_if_data *sdata, |
23 | struct ieee80211_sta_ht_cap *ht_cap, |
24 | u16 flag) |
25 | { |
26 | __le16 le_flag = cpu_to_le16(flag); |
27 | if (sdata->u.mgd.ht_capa_mask.cap_info & le_flag) { |
28 | if (!(sdata->u.mgd.ht_capa.cap_info & le_flag)) |
29 | ht_cap->cap &= ~flag; |
30 | } |
31 | } |
32 | |
33 | void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata, |
34 | struct ieee80211_sta_ht_cap *ht_cap) |
35 | { |
36 | u8 *scaps = (u8 *)(&sdata->u.mgd.ht_capa.mcs.rx_mask); |
37 | u8 *smask = (u8 *)(&sdata->u.mgd.ht_capa_mask.mcs.rx_mask); |
38 | int i; |
39 | |
40 | if (!ht_cap->ht_supported) |
41 | return; |
42 | |
43 | if (sdata->vif.type != NL80211_IFTYPE_STATION) { |
44 | /* AP interfaces call this code when adding new stations, |
45 | * so just silently ignore non station interfaces. |
46 | */ |
47 | return; |
48 | } |
49 | |
50 | /* NOTE: If you add more over-rides here, update register_hw |
51 | * ht_capa_mod_msk logic in main.c as well. |
52 | * And, if this method can ever change ht_cap.ht_supported, fix |
53 | * the check in ieee80211_add_ht_ie. |
54 | */ |
55 | |
56 | /* check for HT over-rides, MCS rates first. */ |
57 | for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) { |
58 | u8 m = smask[i]; |
59 | ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */ |
60 | /* Add back rates that are supported */ |
61 | ht_cap->mcs.rx_mask[i] |= (m & scaps[i]); |
62 | } |
63 | |
64 | /* Force removal of HT-40 capabilities? */ |
65 | __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SUP_WIDTH_20_40); |
66 | __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_40); |
67 | |
68 | /* Allow user to disable SGI-20 (SGI-40 is handled above) */ |
69 | __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_20); |
70 | |
71 | /* Allow user to disable the max-AMSDU bit. */ |
72 | __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU); |
73 | |
74 | /* Allow user to decrease AMPDU factor */ |
75 | if (sdata->u.mgd.ht_capa_mask.ampdu_params_info & |
76 | IEEE80211_HT_AMPDU_PARM_FACTOR) { |
77 | u8 n = sdata->u.mgd.ht_capa.ampdu_params_info |
78 | & IEEE80211_HT_AMPDU_PARM_FACTOR; |
79 | if (n < ht_cap->ampdu_factor) |
80 | ht_cap->ampdu_factor = n; |
81 | } |
82 | |
83 | /* Allow the user to increase AMPDU density. */ |
84 | if (sdata->u.mgd.ht_capa_mask.ampdu_params_info & |
85 | IEEE80211_HT_AMPDU_PARM_DENSITY) { |
86 | u8 n = (sdata->u.mgd.ht_capa.ampdu_params_info & |
87 | IEEE80211_HT_AMPDU_PARM_DENSITY) |
88 | >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT; |
89 | if (n > ht_cap->ampdu_density) |
90 | ht_cap->ampdu_density = n; |
91 | } |
92 | } |
93 | |
94 | |
95 | bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata, |
96 | struct ieee80211_supported_band *sband, |
97 | const struct ieee80211_ht_cap *ht_cap_ie, |
98 | struct sta_info *sta) |
99 | { |
100 | struct ieee80211_sta_ht_cap ht_cap; |
101 | u8 ampdu_info, tx_mcs_set_cap; |
102 | int i, max_tx_streams; |
103 | bool changed; |
104 | enum ieee80211_sta_rx_bandwidth bw; |
105 | enum ieee80211_smps_mode smps_mode; |
106 | |
107 | memset(&ht_cap, 0, sizeof(ht_cap)); |
108 | |
109 | if (!ht_cap_ie || !sband->ht_cap.ht_supported) |
110 | goto apply; |
111 | |
112 | ht_cap.ht_supported = true; |
113 | |
114 | /* |
115 | * The bits listed in this expression should be |
116 | * the same for the peer and us, if the station |
117 | * advertises more then we can't use those thus |
118 | * we mask them out. |
119 | */ |
120 | ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) & |
121 | (sband->ht_cap.cap | |
122 | ~(IEEE80211_HT_CAP_LDPC_CODING | |
123 | IEEE80211_HT_CAP_SUP_WIDTH_20_40 | |
124 | IEEE80211_HT_CAP_GRN_FLD | |
125 | IEEE80211_HT_CAP_SGI_20 | |
126 | IEEE80211_HT_CAP_SGI_40 | |
127 | IEEE80211_HT_CAP_DSSSCCK40)); |
128 | |
129 | /* |
130 | * The STBC bits are asymmetric -- if we don't have |
131 | * TX then mask out the peer's RX and vice versa. |
132 | */ |
133 | if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC)) |
134 | ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC; |
135 | if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC)) |
136 | ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC; |
137 | |
138 | ampdu_info = ht_cap_ie->ampdu_params_info; |
139 | ht_cap.ampdu_factor = |
140 | ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; |
141 | ht_cap.ampdu_density = |
142 | (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; |
143 | |
144 | /* own MCS TX capabilities */ |
145 | tx_mcs_set_cap = sband->ht_cap.mcs.tx_params; |
146 | |
147 | /* Copy peer MCS TX capabilities, the driver might need them. */ |
148 | ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params; |
149 | |
150 | /* can we TX with MCS rates? */ |
151 | if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) |
152 | goto apply; |
153 | |
154 | /* Counting from 0, therefore +1 */ |
155 | if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) |
156 | max_tx_streams = |
157 | ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) |
158 | >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; |
159 | else |
160 | max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; |
161 | |
162 | /* |
163 | * 802.11n-2009 20.3.5 / 20.6 says: |
164 | * - indices 0 to 7 and 32 are single spatial stream |
165 | * - 8 to 31 are multiple spatial streams using equal modulation |
166 | * [8..15 for two streams, 16..23 for three and 24..31 for four] |
167 | * - remainder are multiple spatial streams using unequal modulation |
168 | */ |
169 | for (i = 0; i < max_tx_streams; i++) |
170 | ht_cap.mcs.rx_mask[i] = |
171 | sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; |
172 | |
173 | if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) |
174 | for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; |
175 | i < IEEE80211_HT_MCS_MASK_LEN; i++) |
176 | ht_cap.mcs.rx_mask[i] = |
177 | sband->ht_cap.mcs.rx_mask[i] & |
178 | ht_cap_ie->mcs.rx_mask[i]; |
179 | |
180 | /* handle MCS rate 32 too */ |
181 | if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) |
182 | ht_cap.mcs.rx_mask[32/8] |= 1; |
183 | |
184 | apply: |
185 | /* |
186 | * If user has specified capability over-rides, take care |
187 | * of that here. |
188 | */ |
189 | ieee80211_apply_htcap_overrides(sdata, &ht_cap); |
190 | |
191 | changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap)); |
192 | |
193 | memcpy(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap)); |
194 | |
195 | switch (sdata->vif.bss_conf.chandef.width) { |
196 | default: |
197 | WARN_ON_ONCE(1); |
198 | /* fall through */ |
199 | case NL80211_CHAN_WIDTH_20_NOHT: |
200 | case NL80211_CHAN_WIDTH_20: |
201 | bw = IEEE80211_STA_RX_BW_20; |
202 | break; |
203 | case NL80211_CHAN_WIDTH_40: |
204 | case NL80211_CHAN_WIDTH_80: |
205 | case NL80211_CHAN_WIDTH_80P80: |
206 | case NL80211_CHAN_WIDTH_160: |
207 | bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? |
208 | IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; |
209 | break; |
210 | } |
211 | |
212 | if (bw != sta->sta.bandwidth) |
213 | changed = true; |
214 | sta->sta.bandwidth = bw; |
215 | |
216 | sta->cur_max_bandwidth = |
217 | ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? |
218 | IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; |
219 | |
220 | switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS) |
221 | >> IEEE80211_HT_CAP_SM_PS_SHIFT) { |
222 | case WLAN_HT_CAP_SM_PS_INVALID: |
223 | case WLAN_HT_CAP_SM_PS_STATIC: |
224 | smps_mode = IEEE80211_SMPS_STATIC; |
225 | break; |
226 | case WLAN_HT_CAP_SM_PS_DYNAMIC: |
227 | smps_mode = IEEE80211_SMPS_DYNAMIC; |
228 | break; |
229 | case WLAN_HT_CAP_SM_PS_DISABLED: |
230 | smps_mode = IEEE80211_SMPS_OFF; |
231 | break; |
232 | } |
233 | |
234 | if (smps_mode != sta->sta.smps_mode) |
235 | changed = true; |
236 | sta->sta.smps_mode = smps_mode; |
237 | |
238 | return changed; |
239 | } |
240 | |
241 | void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, |
242 | enum ieee80211_agg_stop_reason reason) |
243 | { |
244 | int i; |
245 | |
246 | cancel_work_sync(&sta->ampdu_mlme.work); |
247 | |
248 | for (i = 0; i < IEEE80211_NUM_TIDS; i++) { |
249 | __ieee80211_stop_tx_ba_session(sta, i, reason); |
250 | __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, |
251 | WLAN_REASON_QSTA_LEAVE_QBSS, |
252 | reason != AGG_STOP_DESTROY_STA && |
253 | reason != AGG_STOP_PEER_REQUEST); |
254 | } |
255 | } |
256 | |
257 | void ieee80211_ba_session_work(struct work_struct *work) |
258 | { |
259 | struct sta_info *sta = |
260 | container_of(work, struct sta_info, ampdu_mlme.work); |
261 | struct tid_ampdu_tx *tid_tx; |
262 | int tid; |
263 | |
264 | /* |
265 | * When this flag is set, new sessions should be |
266 | * blocked, and existing sessions will be torn |
267 | * down by the code that set the flag, so this |
268 | * need not run. |
269 | */ |
270 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) |
271 | return; |
272 | |
273 | mutex_lock(&sta->ampdu_mlme.mtx); |
274 | for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { |
275 | if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) |
276 | ___ieee80211_stop_rx_ba_session( |
277 | sta, tid, WLAN_BACK_RECIPIENT, |
278 | WLAN_REASON_QSTA_TIMEOUT, true); |
279 | |
280 | if (test_and_clear_bit(tid, |
281 | sta->ampdu_mlme.tid_rx_stop_requested)) |
282 | ___ieee80211_stop_rx_ba_session( |
283 | sta, tid, WLAN_BACK_RECIPIENT, |
284 | WLAN_REASON_UNSPECIFIED, true); |
285 | |
286 | tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; |
287 | if (tid_tx) { |
288 | /* |
289 | * Assign it over to the normal tid_tx array |
290 | * where it "goes live". |
291 | */ |
292 | spin_lock_bh(&sta->lock); |
293 | |
294 | sta->ampdu_mlme.tid_start_tx[tid] = NULL; |
295 | /* could there be a race? */ |
296 | if (sta->ampdu_mlme.tid_tx[tid]) |
297 | kfree(tid_tx); |
298 | else |
299 | ieee80211_assign_tid_tx(sta, tid, tid_tx); |
300 | spin_unlock_bh(&sta->lock); |
301 | |
302 | ieee80211_tx_ba_session_handle_start(sta, tid); |
303 | continue; |
304 | } |
305 | |
306 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
307 | if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP, |
308 | &tid_tx->state)) |
309 | ___ieee80211_stop_tx_ba_session(sta, tid, |
310 | AGG_STOP_LOCAL_REQUEST); |
311 | } |
312 | mutex_unlock(&sta->ampdu_mlme.mtx); |
313 | } |
314 | |
315 | void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, |
316 | const u8 *da, u16 tid, |
317 | u16 initiator, u16 reason_code) |
318 | { |
319 | struct ieee80211_local *local = sdata->local; |
320 | struct sk_buff *skb; |
321 | struct ieee80211_mgmt *mgmt; |
322 | u16 params; |
323 | |
324 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); |
325 | if (!skb) |
326 | return; |
327 | |
328 | skb_reserve(skb, local->hw.extra_tx_headroom); |
329 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); |
330 | memset(mgmt, 0, 24); |
331 | memcpy(mgmt->da, da, ETH_ALEN); |
332 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
333 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
334 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN || |
335 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
336 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
337 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
338 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
339 | else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
340 | memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); |
341 | |
342 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
343 | IEEE80211_STYPE_ACTION); |
344 | |
345 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); |
346 | |
347 | mgmt->u.action.category = WLAN_CATEGORY_BACK; |
348 | mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; |
349 | params = (u16)(initiator << 11); /* bit 11 initiator */ |
350 | params |= (u16)(tid << 12); /* bit 15:12 TID number */ |
351 | |
352 | mgmt->u.action.u.delba.params = cpu_to_le16(params); |
353 | mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); |
354 | |
355 | ieee80211_tx_skb_tid(sdata, skb, tid); |
356 | } |
357 | |
358 | void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, |
359 | struct sta_info *sta, |
360 | struct ieee80211_mgmt *mgmt, size_t len) |
361 | { |
362 | u16 tid, params; |
363 | u16 initiator; |
364 | |
365 | params = le16_to_cpu(mgmt->u.action.u.delba.params); |
366 | tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; |
367 | initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; |
368 | |
369 | ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n", |
370 | mgmt->sa, initiator ? "initiator" : "recipient", |
371 | tid, |
372 | le16_to_cpu(mgmt->u.action.u.delba.reason_code)); |
373 | |
374 | if (initiator == WLAN_BACK_INITIATOR) |
375 | __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, |
376 | true); |
377 | else |
378 | __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST); |
379 | } |
380 | |
381 | int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, |
382 | enum ieee80211_smps_mode smps, const u8 *da, |
383 | const u8 *bssid) |
384 | { |
385 | struct ieee80211_local *local = sdata->local; |
386 | struct sk_buff *skb; |
387 | struct ieee80211_mgmt *action_frame; |
388 | |
389 | /* 27 = header + category + action + smps mode */ |
390 | skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); |
391 | if (!skb) |
392 | return -ENOMEM; |
393 | |
394 | skb_reserve(skb, local->hw.extra_tx_headroom); |
395 | action_frame = (void *)skb_put(skb, 27); |
396 | memcpy(action_frame->da, da, ETH_ALEN); |
397 | memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); |
398 | memcpy(action_frame->bssid, bssid, ETH_ALEN); |
399 | action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
400 | IEEE80211_STYPE_ACTION); |
401 | action_frame->u.action.category = WLAN_CATEGORY_HT; |
402 | action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; |
403 | switch (smps) { |
404 | case IEEE80211_SMPS_AUTOMATIC: |
405 | case IEEE80211_SMPS_NUM_MODES: |
406 | WARN_ON(1); |
407 | case IEEE80211_SMPS_OFF: |
408 | action_frame->u.action.u.ht_smps.smps_control = |
409 | WLAN_HT_SMPS_CONTROL_DISABLED; |
410 | break; |
411 | case IEEE80211_SMPS_STATIC: |
412 | action_frame->u.action.u.ht_smps.smps_control = |
413 | WLAN_HT_SMPS_CONTROL_STATIC; |
414 | break; |
415 | case IEEE80211_SMPS_DYNAMIC: |
416 | action_frame->u.action.u.ht_smps.smps_control = |
417 | WLAN_HT_SMPS_CONTROL_DYNAMIC; |
418 | break; |
419 | } |
420 | |
421 | /* we'll do more on status of this frame */ |
422 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; |
423 | ieee80211_tx_skb(sdata, skb); |
424 | |
425 | return 0; |
426 | } |
427 | |
428 | void ieee80211_request_smps_work(struct work_struct *work) |
429 | { |
430 | struct ieee80211_sub_if_data *sdata = |
431 | container_of(work, struct ieee80211_sub_if_data, |
432 | u.mgd.request_smps_work); |
433 | |
434 | mutex_lock(&sdata->u.mgd.mtx); |
435 | __ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode); |
436 | mutex_unlock(&sdata->u.mgd.mtx); |
437 | } |
438 | |
439 | void ieee80211_request_smps(struct ieee80211_vif *vif, |
440 | enum ieee80211_smps_mode smps_mode) |
441 | { |
442 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
443 | |
444 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) |
445 | return; |
446 | |
447 | if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF)) |
448 | smps_mode = IEEE80211_SMPS_AUTOMATIC; |
449 | |
450 | if (sdata->u.mgd.driver_smps_mode == smps_mode) |
451 | return; |
452 | |
453 | sdata->u.mgd.driver_smps_mode = smps_mode; |
454 | |
455 | ieee80211_queue_work(&sdata->local->hw, |
456 | &sdata->u.mgd.request_smps_work); |
457 | } |
458 | /* this might change ... don't want non-open drivers using it */ |
459 | EXPORT_SYMBOL_GPL(ieee80211_request_smps); |
460 |
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