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
ieee80111_cfg_override_disables_ht40(struct ieee80211_sub_if_data * sdata)22 bool ieee80111_cfg_override_disables_ht40(struct ieee80211_sub_if_data *sdata)
23 {
24 const __le16 flg = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40);
25 if ((sdata->u.mgd.ht_capa_mask.cap_info & flg) &&
26 !(sdata->u.mgd.ht_capa.cap_info & flg))
27 return true;
28 return false;
29 }
30
__check_htcap_disable(struct ieee80211_sub_if_data * sdata,struct ieee80211_sta_ht_cap * ht_cap,u16 flag)31 static void __check_htcap_disable(struct ieee80211_sub_if_data *sdata,
32 struct ieee80211_sta_ht_cap *ht_cap,
33 u16 flag)
34 {
35 __le16 le_flag = cpu_to_le16(flag);
36 if (sdata->u.mgd.ht_capa_mask.cap_info & le_flag) {
37 if (!(sdata->u.mgd.ht_capa.cap_info & le_flag))
38 ht_cap->cap &= ~flag;
39 }
40 }
41
ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data * sdata,struct ieee80211_sta_ht_cap * ht_cap)42 void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
43 struct ieee80211_sta_ht_cap *ht_cap)
44 {
45 u8 *scaps = (u8 *)(&sdata->u.mgd.ht_capa.mcs.rx_mask);
46 u8 *smask = (u8 *)(&sdata->u.mgd.ht_capa_mask.mcs.rx_mask);
47 int i;
48
49 if (sdata->vif.type != NL80211_IFTYPE_STATION) {
50 /* AP interfaces call this code when adding new stations,
51 * so just silently ignore non station interfaces.
52 */
53 return;
54 }
55
56 /* NOTE: If you add more over-rides here, update register_hw
57 * ht_capa_mod_msk logic in main.c as well.
58 * And, if this method can ever change ht_cap.ht_supported, fix
59 * the check in ieee80211_add_ht_ie.
60 */
61
62 /* check for HT over-rides, MCS rates first. */
63 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
64 u8 m = smask[i];
65 ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */
66 /* Add back rates that are supported */
67 ht_cap->mcs.rx_mask[i] |= (m & scaps[i]);
68 }
69
70 /* Force removal of HT-40 capabilities? */
71 __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SUP_WIDTH_20_40);
72 __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_40);
73
74 /* Allow user to disable the max-AMSDU bit. */
75 __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU);
76
77 /* Allow user to decrease AMPDU factor */
78 if (sdata->u.mgd.ht_capa_mask.ampdu_params_info &
79 IEEE80211_HT_AMPDU_PARM_FACTOR) {
80 u8 n = sdata->u.mgd.ht_capa.ampdu_params_info
81 & IEEE80211_HT_AMPDU_PARM_FACTOR;
82 if (n < ht_cap->ampdu_factor)
83 ht_cap->ampdu_factor = n;
84 }
85
86 /* Allow the user to increase AMPDU density. */
87 if (sdata->u.mgd.ht_capa_mask.ampdu_params_info &
88 IEEE80211_HT_AMPDU_PARM_DENSITY) {
89 u8 n = (sdata->u.mgd.ht_capa.ampdu_params_info &
90 IEEE80211_HT_AMPDU_PARM_DENSITY)
91 >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
92 if (n > ht_cap->ampdu_density)
93 ht_cap->ampdu_density = n;
94 }
95 }
96
97
ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data * sdata,struct ieee80211_supported_band * sband,struct ieee80211_ht_cap * ht_cap_ie,struct ieee80211_sta_ht_cap * ht_cap)98 void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
99 struct ieee80211_supported_band *sband,
100 struct ieee80211_ht_cap *ht_cap_ie,
101 struct ieee80211_sta_ht_cap *ht_cap)
102 {
103 u8 ampdu_info, tx_mcs_set_cap;
104 int i, max_tx_streams;
105
106 BUG_ON(!ht_cap);
107
108 memset(ht_cap, 0, sizeof(*ht_cap));
109
110 if (!ht_cap_ie || !sband->ht_cap.ht_supported)
111 return;
112
113 ht_cap->ht_supported = true;
114
115 /*
116 * The bits listed in this expression should be
117 * the same for the peer and us, if the station
118 * advertises more then we can't use those thus
119 * we mask them out.
120 */
121 ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) &
122 (sband->ht_cap.cap |
123 ~(IEEE80211_HT_CAP_LDPC_CODING |
124 IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
125 IEEE80211_HT_CAP_GRN_FLD |
126 IEEE80211_HT_CAP_SGI_20 |
127 IEEE80211_HT_CAP_SGI_40 |
128 IEEE80211_HT_CAP_DSSSCCK40));
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 return;
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 /*
185 * If user has specified capability over-rides, take care
186 * of that here.
187 */
188 ieee80211_apply_htcap_overrides(sdata, ht_cap);
189 }
190
ieee80211_sta_tear_down_BA_sessions(struct sta_info * sta,bool tx)191 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx)
192 {
193 int i;
194
195 cancel_work_sync(&sta->ampdu_mlme.work);
196
197 for (i = 0; i < STA_TID_NUM; i++) {
198 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR, tx);
199 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
200 WLAN_REASON_QSTA_LEAVE_QBSS, tx);
201 }
202 }
203
ieee80211_ba_session_work(struct work_struct * work)204 void ieee80211_ba_session_work(struct work_struct *work)
205 {
206 struct sta_info *sta =
207 container_of(work, struct sta_info, ampdu_mlme.work);
208 struct tid_ampdu_tx *tid_tx;
209 int tid;
210
211 /*
212 * When this flag is set, new sessions should be
213 * blocked, and existing sessions will be torn
214 * down by the code that set the flag, so this
215 * need not run.
216 */
217 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA))
218 return;
219
220 mutex_lock(&sta->ampdu_mlme.mtx);
221 for (tid = 0; tid < STA_TID_NUM; tid++) {
222 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
223 ___ieee80211_stop_rx_ba_session(
224 sta, tid, WLAN_BACK_RECIPIENT,
225 WLAN_REASON_QSTA_TIMEOUT, true);
226
227 if (test_and_clear_bit(tid,
228 sta->ampdu_mlme.tid_rx_stop_requested))
229 ___ieee80211_stop_rx_ba_session(
230 sta, tid, WLAN_BACK_RECIPIENT,
231 WLAN_REASON_UNSPECIFIED, true);
232
233 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
234 if (tid_tx) {
235 /*
236 * Assign it over to the normal tid_tx array
237 * where it "goes live".
238 */
239 spin_lock_bh(&sta->lock);
240
241 sta->ampdu_mlme.tid_start_tx[tid] = NULL;
242 /* could there be a race? */
243 if (sta->ampdu_mlme.tid_tx[tid])
244 kfree(tid_tx);
245 else
246 ieee80211_assign_tid_tx(sta, tid, tid_tx);
247 spin_unlock_bh(&sta->lock);
248
249 ieee80211_tx_ba_session_handle_start(sta, tid);
250 continue;
251 }
252
253 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
254 if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
255 &tid_tx->state))
256 ___ieee80211_stop_tx_ba_session(sta, tid,
257 WLAN_BACK_INITIATOR,
258 true);
259 }
260 mutex_unlock(&sta->ampdu_mlme.mtx);
261 }
262
ieee80211_send_delba(struct ieee80211_sub_if_data * sdata,const u8 * da,u16 tid,u16 initiator,u16 reason_code)263 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
264 const u8 *da, u16 tid,
265 u16 initiator, u16 reason_code)
266 {
267 struct ieee80211_local *local = sdata->local;
268 struct sk_buff *skb;
269 struct ieee80211_mgmt *mgmt;
270 u16 params;
271
272 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
273 if (!skb)
274 return;
275
276 skb_reserve(skb, local->hw.extra_tx_headroom);
277 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
278 memset(mgmt, 0, 24);
279 memcpy(mgmt->da, da, ETH_ALEN);
280 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
281 if (sdata->vif.type == NL80211_IFTYPE_AP ||
282 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
283 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
284 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
285 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
286 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
287 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
288 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
289
290 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
291 IEEE80211_STYPE_ACTION);
292
293 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
294
295 mgmt->u.action.category = WLAN_CATEGORY_BACK;
296 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
297 params = (u16)(initiator << 11); /* bit 11 initiator */
298 params |= (u16)(tid << 12); /* bit 15:12 TID number */
299
300 mgmt->u.action.u.delba.params = cpu_to_le16(params);
301 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
302
303 ieee80211_tx_skb_tid(sdata, skb, tid);
304 }
305
ieee80211_process_delba(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_mgmt * mgmt,size_t len)306 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
307 struct sta_info *sta,
308 struct ieee80211_mgmt *mgmt, size_t len)
309 {
310 u16 tid, params;
311 u16 initiator;
312
313 params = le16_to_cpu(mgmt->u.action.u.delba.params);
314 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
315 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
316
317 #ifdef CONFIG_MAC80211_HT_DEBUG
318 if (net_ratelimit())
319 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
320 mgmt->sa, initiator ? "initiator" : "recipient", tid,
321 le16_to_cpu(mgmt->u.action.u.delba.reason_code));
322 #endif /* CONFIG_MAC80211_HT_DEBUG */
323
324 if (initiator == WLAN_BACK_INITIATOR)
325 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
326 true);
327 else
328 __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
329 true);
330 }
331
ieee80211_send_smps_action(struct ieee80211_sub_if_data * sdata,enum ieee80211_smps_mode smps,const u8 * da,const u8 * bssid)332 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
333 enum ieee80211_smps_mode smps, const u8 *da,
334 const u8 *bssid)
335 {
336 struct ieee80211_local *local = sdata->local;
337 struct sk_buff *skb;
338 struct ieee80211_mgmt *action_frame;
339
340 /* 27 = header + category + action + smps mode */
341 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
342 if (!skb)
343 return -ENOMEM;
344
345 skb_reserve(skb, local->hw.extra_tx_headroom);
346 action_frame = (void *)skb_put(skb, 27);
347 memcpy(action_frame->da, da, ETH_ALEN);
348 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
349 memcpy(action_frame->bssid, bssid, ETH_ALEN);
350 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
351 IEEE80211_STYPE_ACTION);
352 action_frame->u.action.category = WLAN_CATEGORY_HT;
353 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
354 switch (smps) {
355 case IEEE80211_SMPS_AUTOMATIC:
356 case IEEE80211_SMPS_NUM_MODES:
357 WARN_ON(1);
358 case IEEE80211_SMPS_OFF:
359 action_frame->u.action.u.ht_smps.smps_control =
360 WLAN_HT_SMPS_CONTROL_DISABLED;
361 break;
362 case IEEE80211_SMPS_STATIC:
363 action_frame->u.action.u.ht_smps.smps_control =
364 WLAN_HT_SMPS_CONTROL_STATIC;
365 break;
366 case IEEE80211_SMPS_DYNAMIC:
367 action_frame->u.action.u.ht_smps.smps_control =
368 WLAN_HT_SMPS_CONTROL_DYNAMIC;
369 break;
370 }
371
372 /* we'll do more on status of this frame */
373 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
374 ieee80211_tx_skb(sdata, skb);
375
376 return 0;
377 }
378
ieee80211_request_smps_work(struct work_struct * work)379 void ieee80211_request_smps_work(struct work_struct *work)
380 {
381 struct ieee80211_sub_if_data *sdata =
382 container_of(work, struct ieee80211_sub_if_data,
383 u.mgd.request_smps_work);
384
385 mutex_lock(&sdata->u.mgd.mtx);
386 __ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode);
387 mutex_unlock(&sdata->u.mgd.mtx);
388 }
389
ieee80211_request_smps(struct ieee80211_vif * vif,enum ieee80211_smps_mode smps_mode)390 void ieee80211_request_smps(struct ieee80211_vif *vif,
391 enum ieee80211_smps_mode smps_mode)
392 {
393 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
394
395 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
396 return;
397
398 if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF))
399 smps_mode = IEEE80211_SMPS_AUTOMATIC;
400
401 sdata->u.mgd.driver_smps_mode = smps_mode;
402
403 ieee80211_queue_work(&sdata->local->hw,
404 &sdata->u.mgd.request_smps_work);
405 }
406 /* this might change ... don't want non-open drivers using it */
407 EXPORT_SYMBOL_GPL(ieee80211_request_smps);
408