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 <net/mac80211.h>
18 #include "ieee80211_i.h"
19 #include "rate.h"
20
ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band * sband,struct ieee80211_ht_cap * ht_cap_ie,struct ieee80211_sta_ht_cap * ht_cap)21 void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
22 struct ieee80211_ht_cap *ht_cap_ie,
23 struct ieee80211_sta_ht_cap *ht_cap)
24 {
25 u8 ampdu_info, tx_mcs_set_cap;
26 int i, max_tx_streams;
27
28 BUG_ON(!ht_cap);
29
30 memset(ht_cap, 0, sizeof(*ht_cap));
31
32 if (!ht_cap_ie || !sband->ht_cap.ht_supported)
33 return;
34
35 ht_cap->ht_supported = true;
36
37 /*
38 * The bits listed in this expression should be
39 * the same for the peer and us, if the station
40 * advertises more then we can't use those thus
41 * we mask them out.
42 */
43 ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) &
44 (sband->ht_cap.cap |
45 ~(IEEE80211_HT_CAP_LDPC_CODING |
46 IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
47 IEEE80211_HT_CAP_GRN_FLD |
48 IEEE80211_HT_CAP_SGI_20 |
49 IEEE80211_HT_CAP_SGI_40 |
50 IEEE80211_HT_CAP_DSSSCCK40));
51 /*
52 * The STBC bits are asymmetric -- if we don't have
53 * TX then mask out the peer's RX and vice versa.
54 */
55 if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
56 ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC;
57 if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC))
58 ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC;
59
60 ampdu_info = ht_cap_ie->ampdu_params_info;
61 ht_cap->ampdu_factor =
62 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
63 ht_cap->ampdu_density =
64 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
65
66 /* own MCS TX capabilities */
67 tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
68
69 /* Copy peer MCS TX capabilities, the driver might need them. */
70 ht_cap->mcs.tx_params = ht_cap_ie->mcs.tx_params;
71
72 /* can we TX with MCS rates? */
73 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
74 return;
75
76 /* Counting from 0, therefore +1 */
77 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
78 max_tx_streams =
79 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
80 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
81 else
82 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
83
84 /*
85 * 802.11n-2009 20.3.5 / 20.6 says:
86 * - indices 0 to 7 and 32 are single spatial stream
87 * - 8 to 31 are multiple spatial streams using equal modulation
88 * [8..15 for two streams, 16..23 for three and 24..31 for four]
89 * - remainder are multiple spatial streams using unequal modulation
90 */
91 for (i = 0; i < max_tx_streams; i++)
92 ht_cap->mcs.rx_mask[i] =
93 sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
94
95 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
96 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
97 i < IEEE80211_HT_MCS_MASK_LEN; i++)
98 ht_cap->mcs.rx_mask[i] =
99 sband->ht_cap.mcs.rx_mask[i] &
100 ht_cap_ie->mcs.rx_mask[i];
101
102 /* handle MCS rate 32 too */
103 if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
104 ht_cap->mcs.rx_mask[32/8] |= 1;
105 }
106
ieee80211_sta_tear_down_BA_sessions(struct sta_info * sta,bool tx)107 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx)
108 {
109 int i;
110
111 cancel_work_sync(&sta->ampdu_mlme.work);
112
113 for (i = 0; i < STA_TID_NUM; i++) {
114 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR, tx);
115 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
116 WLAN_REASON_QSTA_LEAVE_QBSS, tx);
117 }
118 }
119
ieee80211_ba_session_work(struct work_struct * work)120 void ieee80211_ba_session_work(struct work_struct *work)
121 {
122 struct sta_info *sta =
123 container_of(work, struct sta_info, ampdu_mlme.work);
124 struct tid_ampdu_tx *tid_tx;
125 int tid;
126
127 /*
128 * When this flag is set, new sessions should be
129 * blocked, and existing sessions will be torn
130 * down by the code that set the flag, so this
131 * need not run.
132 */
133 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA))
134 return;
135
136 mutex_lock(&sta->ampdu_mlme.mtx);
137 for (tid = 0; tid < STA_TID_NUM; tid++) {
138 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
139 ___ieee80211_stop_rx_ba_session(
140 sta, tid, WLAN_BACK_RECIPIENT,
141 WLAN_REASON_QSTA_TIMEOUT, true);
142
143 tid_tx = sta->ampdu_mlme.tid_tx[tid];
144 if (!tid_tx)
145 continue;
146
147 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state))
148 ieee80211_tx_ba_session_handle_start(sta, tid);
149 else if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
150 &tid_tx->state))
151 ___ieee80211_stop_tx_ba_session(sta, tid,
152 WLAN_BACK_INITIATOR,
153 true);
154 }
155 mutex_unlock(&sta->ampdu_mlme.mtx);
156 }
157
ieee80211_send_delba(struct ieee80211_sub_if_data * sdata,const u8 * da,u16 tid,u16 initiator,u16 reason_code)158 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
159 const u8 *da, u16 tid,
160 u16 initiator, u16 reason_code)
161 {
162 struct ieee80211_local *local = sdata->local;
163 struct sk_buff *skb;
164 struct ieee80211_mgmt *mgmt;
165 u16 params;
166
167 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
168
169 if (!skb) {
170 printk(KERN_ERR "%s: failed to allocate buffer "
171 "for delba frame\n", sdata->name);
172 return;
173 }
174
175 skb_reserve(skb, local->hw.extra_tx_headroom);
176 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
177 memset(mgmt, 0, 24);
178 memcpy(mgmt->da, da, ETH_ALEN);
179 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
180 if (sdata->vif.type == NL80211_IFTYPE_AP ||
181 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
182 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
183 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
184 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
185
186 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
187 IEEE80211_STYPE_ACTION);
188
189 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
190
191 mgmt->u.action.category = WLAN_CATEGORY_BACK;
192 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
193 params = (u16)(initiator << 11); /* bit 11 initiator */
194 params |= (u16)(tid << 12); /* bit 15:12 TID number */
195
196 mgmt->u.action.u.delba.params = cpu_to_le16(params);
197 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
198
199 ieee80211_tx_skb(sdata, skb);
200 }
201
ieee80211_process_delba(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_mgmt * mgmt,size_t len)202 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
203 struct sta_info *sta,
204 struct ieee80211_mgmt *mgmt, size_t len)
205 {
206 u16 tid, params;
207 u16 initiator;
208
209 params = le16_to_cpu(mgmt->u.action.u.delba.params);
210 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
211 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
212
213 #ifdef CONFIG_MAC80211_HT_DEBUG
214 if (net_ratelimit())
215 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
216 mgmt->sa, initiator ? "initiator" : "recipient", tid,
217 le16_to_cpu(mgmt->u.action.u.delba.reason_code));
218 #endif /* CONFIG_MAC80211_HT_DEBUG */
219
220 if (initiator == WLAN_BACK_INITIATOR)
221 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
222 true);
223 else
224 __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
225 true);
226 }
227
ieee80211_send_smps_action(struct ieee80211_sub_if_data * sdata,enum ieee80211_smps_mode smps,const u8 * da,const u8 * bssid)228 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
229 enum ieee80211_smps_mode smps, const u8 *da,
230 const u8 *bssid)
231 {
232 struct ieee80211_local *local = sdata->local;
233 struct sk_buff *skb;
234 struct ieee80211_mgmt *action_frame;
235
236 /* 27 = header + category + action + smps mode */
237 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
238 if (!skb)
239 return -ENOMEM;
240
241 skb_reserve(skb, local->hw.extra_tx_headroom);
242 action_frame = (void *)skb_put(skb, 27);
243 memcpy(action_frame->da, da, ETH_ALEN);
244 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
245 memcpy(action_frame->bssid, bssid, ETH_ALEN);
246 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
247 IEEE80211_STYPE_ACTION);
248 action_frame->u.action.category = WLAN_CATEGORY_HT;
249 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
250 switch (smps) {
251 case IEEE80211_SMPS_AUTOMATIC:
252 case IEEE80211_SMPS_NUM_MODES:
253 WARN_ON(1);
254 case IEEE80211_SMPS_OFF:
255 action_frame->u.action.u.ht_smps.smps_control =
256 WLAN_HT_SMPS_CONTROL_DISABLED;
257 break;
258 case IEEE80211_SMPS_STATIC:
259 action_frame->u.action.u.ht_smps.smps_control =
260 WLAN_HT_SMPS_CONTROL_STATIC;
261 break;
262 case IEEE80211_SMPS_DYNAMIC:
263 action_frame->u.action.u.ht_smps.smps_control =
264 WLAN_HT_SMPS_CONTROL_DYNAMIC;
265 break;
266 }
267
268 /* we'll do more on status of this frame */
269 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
270 ieee80211_tx_skb(sdata, skb);
271
272 return 0;
273 }
274
ieee80211_request_smps_work(struct work_struct * work)275 void ieee80211_request_smps_work(struct work_struct *work)
276 {
277 struct ieee80211_sub_if_data *sdata =
278 container_of(work, struct ieee80211_sub_if_data,
279 u.mgd.request_smps_work);
280
281 mutex_lock(&sdata->u.mgd.mtx);
282 __ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode);
283 mutex_unlock(&sdata->u.mgd.mtx);
284 }
285
ieee80211_request_smps(struct ieee80211_vif * vif,enum ieee80211_smps_mode smps_mode)286 void ieee80211_request_smps(struct ieee80211_vif *vif,
287 enum ieee80211_smps_mode smps_mode)
288 {
289 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
290
291 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
292 return;
293
294 if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF))
295 smps_mode = IEEE80211_SMPS_AUTOMATIC;
296
297 sdata->u.mgd.driver_smps_mode = smps_mode;
298
299 ieee80211_queue_work(&sdata->local->hw,
300 &sdata->u.mgd.request_smps_work);
301 }
302 /* this might change ... don't want non-open drivers using it */
303 EXPORT_SYMBOL_GPL(ieee80211_request_smps);
304