Commit | Line | Data |
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44d414db JB |
1 | /* |
2 | * HT handling | |
3 | * | |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
bacac545 JB |
5 | * Copyright 2002-2005, Instant802 Networks, Inc. |
6 | * Copyright 2005-2006, Devicescape Software, Inc. | |
44d414db JB |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
cfcdbde3 | 9 | * Copyright 2007-2010, Intel Corporation |
44d414db JB |
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> | |
bc3b2d7f | 17 | #include <linux/export.h> |
44d414db JB |
18 | #include <net/mac80211.h> |
19 | #include "ieee80211_i.h" | |
81cb7623 | 20 | #include "rate.h" |
44d414db | 21 | |
32dfefac BG |
22 | static void __check_htcap_disable(struct ieee80211_sub_if_data *sdata, |
23 | struct ieee80211_sta_ht_cap *ht_cap, | |
24 | u16 flag) | |
ef96a842 BG |
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 (sdata->vif.type != NL80211_IFTYPE_STATION) { | |
4e79fada BG |
41 | /* AP interfaces call this code when adding new stations, |
42 | * so just silently ignore non station interfaces. | |
43 | */ | |
ef96a842 BG |
44 | return; |
45 | } | |
46 | ||
47 | /* NOTE: If you add more over-rides here, update register_hw | |
48 | * ht_capa_mod_msk logic in main.c as well. | |
49 | * And, if this method can ever change ht_cap.ht_supported, fix | |
50 | * the check in ieee80211_add_ht_ie. | |
51 | */ | |
52 | ||
53 | /* check for HT over-rides, MCS rates first. */ | |
54 | for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) { | |
55 | u8 m = smask[i]; | |
56 | ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */ | |
57 | /* Add back rates that are supported */ | |
58 | ht_cap->mcs.rx_mask[i] |= (m & scaps[i]); | |
59 | } | |
60 | ||
61 | /* Force removal of HT-40 capabilities? */ | |
62 | __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SUP_WIDTH_20_40); | |
63 | __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_40); | |
64 | ||
65 | /* Allow user to disable the max-AMSDU bit. */ | |
66 | __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU); | |
67 | ||
68 | /* Allow user to decrease AMPDU factor */ | |
69 | if (sdata->u.mgd.ht_capa_mask.ampdu_params_info & | |
70 | IEEE80211_HT_AMPDU_PARM_FACTOR) { | |
71 | u8 n = sdata->u.mgd.ht_capa.ampdu_params_info | |
72 | & IEEE80211_HT_AMPDU_PARM_FACTOR; | |
73 | if (n < ht_cap->ampdu_factor) | |
74 | ht_cap->ampdu_factor = n; | |
75 | } | |
76 | ||
77 | /* Allow the user to increase AMPDU density. */ | |
78 | if (sdata->u.mgd.ht_capa_mask.ampdu_params_info & | |
79 | IEEE80211_HT_AMPDU_PARM_DENSITY) { | |
80 | u8 n = (sdata->u.mgd.ht_capa.ampdu_params_info & | |
81 | IEEE80211_HT_AMPDU_PARM_DENSITY) | |
82 | >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT; | |
83 | if (n > ht_cap->ampdu_density) | |
84 | ht_cap->ampdu_density = n; | |
85 | } | |
86 | } | |
87 | ||
88 | ||
89 | void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata, | |
90 | struct ieee80211_supported_band *sband, | |
ae5eb026 | 91 | struct ieee80211_ht_cap *ht_cap_ie, |
d9fe60de | 92 | struct ieee80211_sta_ht_cap *ht_cap) |
44d414db | 93 | { |
ae5eb026 JB |
94 | u8 ampdu_info, tx_mcs_set_cap; |
95 | int i, max_tx_streams; | |
44d414db | 96 | |
d9fe60de | 97 | BUG_ON(!ht_cap); |
44d414db | 98 | |
d9fe60de | 99 | memset(ht_cap, 0, sizeof(*ht_cap)); |
44d414db | 100 | |
15804e3e | 101 | if (!ht_cap_ie || !sband->ht_cap.ht_supported) |
ae5eb026 | 102 | return; |
d9fe60de | 103 | |
ae5eb026 | 104 | ht_cap->ht_supported = true; |
d9fe60de | 105 | |
9a418af5 JB |
106 | /* |
107 | * The bits listed in this expression should be | |
108 | * the same for the peer and us, if the station | |
109 | * advertises more then we can't use those thus | |
110 | * we mask them out. | |
111 | */ | |
112 | ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & | |
113 | (sband->ht_cap.cap | | |
114 | ~(IEEE80211_HT_CAP_LDPC_CODING | | |
115 | IEEE80211_HT_CAP_SUP_WIDTH_20_40 | | |
116 | IEEE80211_HT_CAP_GRN_FLD | | |
117 | IEEE80211_HT_CAP_SGI_20 | | |
118 | IEEE80211_HT_CAP_SGI_40 | | |
119 | IEEE80211_HT_CAP_DSSSCCK40)); | |
120 | /* | |
121 | * The STBC bits are asymmetric -- if we don't have | |
122 | * TX then mask out the peer's RX and vice versa. | |
123 | */ | |
124 | if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC)) | |
125 | ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC; | |
126 | if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC)) | |
127 | ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC; | |
d9fe60de | 128 | |
ae5eb026 JB |
129 | ampdu_info = ht_cap_ie->ampdu_params_info; |
130 | ht_cap->ampdu_factor = | |
131 | ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; | |
132 | ht_cap->ampdu_density = | |
133 | (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; | |
44d414db | 134 | |
d9fe60de JB |
135 | /* own MCS TX capabilities */ |
136 | tx_mcs_set_cap = sband->ht_cap.mcs.tx_params; | |
137 | ||
90b4ca9d JB |
138 | /* Copy peer MCS TX capabilities, the driver might need them. */ |
139 | ht_cap->mcs.tx_params = ht_cap_ie->mcs.tx_params; | |
140 | ||
d9fe60de JB |
141 | /* can we TX with MCS rates? */ |
142 | if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) | |
ae5eb026 | 143 | return; |
d9fe60de JB |
144 | |
145 | /* Counting from 0, therefore +1 */ | |
146 | if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) | |
147 | max_tx_streams = | |
148 | ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) | |
149 | >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; | |
150 | else | |
151 | max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; | |
152 | ||
153 | /* | |
90b4ca9d | 154 | * 802.11n-2009 20.3.5 / 20.6 says: |
d9fe60de JB |
155 | * - indices 0 to 7 and 32 are single spatial stream |
156 | * - 8 to 31 are multiple spatial streams using equal modulation | |
157 | * [8..15 for two streams, 16..23 for three and 24..31 for four] | |
158 | * - remainder are multiple spatial streams using unequal modulation | |
159 | */ | |
160 | for (i = 0; i < max_tx_streams; i++) | |
ae5eb026 JB |
161 | ht_cap->mcs.rx_mask[i] = |
162 | sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; | |
d9fe60de JB |
163 | |
164 | if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) | |
165 | for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; | |
166 | i < IEEE80211_HT_MCS_MASK_LEN; i++) | |
ae5eb026 | 167 | ht_cap->mcs.rx_mask[i] = |
d9fe60de | 168 | sband->ht_cap.mcs.rx_mask[i] & |
ae5eb026 | 169 | ht_cap_ie->mcs.rx_mask[i]; |
d9fe60de JB |
170 | |
171 | /* handle MCS rate 32 too */ | |
ae5eb026 JB |
172 | if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) |
173 | ht_cap->mcs.rx_mask[32/8] |= 1; | |
ef96a842 BG |
174 | |
175 | /* | |
176 | * If user has specified capability over-rides, take care | |
177 | * of that here. | |
178 | */ | |
179 | ieee80211_apply_htcap_overrides(sdata, ht_cap); | |
ae5eb026 JB |
180 | } |
181 | ||
53f73c09 | 182 | void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx) |
de1ede7a | 183 | { |
b8695a8f | 184 | int i; |
de1ede7a | 185 | |
0ab33703 JB |
186 | cancel_work_sync(&sta->ampdu_mlme.work); |
187 | ||
b8695a8f | 188 | for (i = 0; i < STA_TID_NUM; i++) { |
53f73c09 | 189 | __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR, tx); |
849b7967 | 190 | __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, |
53f73c09 | 191 | WLAN_REASON_QSTA_LEAVE_QBSS, tx); |
de1ede7a | 192 | } |
de1ede7a JB |
193 | } |
194 | ||
67c282c0 JB |
195 | void ieee80211_ba_session_work(struct work_struct *work) |
196 | { | |
197 | struct sta_info *sta = | |
198 | container_of(work, struct sta_info, ampdu_mlme.work); | |
199 | struct tid_ampdu_tx *tid_tx; | |
200 | int tid; | |
201 | ||
202 | /* | |
203 | * When this flag is set, new sessions should be | |
204 | * blocked, and existing sessions will be torn | |
205 | * down by the code that set the flag, so this | |
206 | * need not run. | |
207 | */ | |
c2c98fde | 208 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) |
67c282c0 JB |
209 | return; |
210 | ||
a93e3644 | 211 | mutex_lock(&sta->ampdu_mlme.mtx); |
67c282c0 | 212 | for (tid = 0; tid < STA_TID_NUM; tid++) { |
7c3b1dd8 JB |
213 | if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) |
214 | ___ieee80211_stop_rx_ba_session( | |
215 | sta, tid, WLAN_BACK_RECIPIENT, | |
53f73c09 | 216 | WLAN_REASON_QSTA_TIMEOUT, true); |
7c3b1dd8 | 217 | |
f41ccd71 SL |
218 | if (test_and_clear_bit(tid, |
219 | sta->ampdu_mlme.tid_rx_stop_requested)) | |
220 | ___ieee80211_stop_rx_ba_session( | |
221 | sta, tid, WLAN_BACK_RECIPIENT, | |
222 | WLAN_REASON_UNSPECIFIED, true); | |
223 | ||
ec034b20 JB |
224 | tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; |
225 | if (tid_tx) { | |
226 | /* | |
227 | * Assign it over to the normal tid_tx array | |
228 | * where it "goes live". | |
229 | */ | |
230 | spin_lock_bh(&sta->lock); | |
231 | ||
232 | sta->ampdu_mlme.tid_start_tx[tid] = NULL; | |
233 | /* could there be a race? */ | |
234 | if (sta->ampdu_mlme.tid_tx[tid]) | |
235 | kfree(tid_tx); | |
236 | else | |
237 | ieee80211_assign_tid_tx(sta, tid, tid_tx); | |
238 | spin_unlock_bh(&sta->lock); | |
67c282c0 | 239 | |
67c282c0 | 240 | ieee80211_tx_ba_session_handle_start(sta, tid); |
ec034b20 JB |
241 | continue; |
242 | } | |
243 | ||
40b275b6 | 244 | tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
ec034b20 JB |
245 | if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP, |
246 | &tid_tx->state)) | |
67c282c0 | 247 | ___ieee80211_stop_tx_ba_session(sta, tid, |
53f73c09 JB |
248 | WLAN_BACK_INITIATOR, |
249 | true); | |
67c282c0 | 250 | } |
cfcdbde3 | 251 | mutex_unlock(&sta->ampdu_mlme.mtx); |
67c282c0 JB |
252 | } |
253 | ||
b8695a8f JB |
254 | void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, |
255 | const u8 *da, u16 tid, | |
256 | u16 initiator, u16 reason_code) | |
44d414db JB |
257 | { |
258 | struct ieee80211_local *local = sdata->local; | |
44d414db JB |
259 | struct sk_buff *skb; |
260 | struct ieee80211_mgmt *mgmt; | |
261 | u16 params; | |
262 | ||
263 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
d15b8459 | 264 | if (!skb) |
44d414db | 265 | return; |
44d414db JB |
266 | |
267 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
268 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
269 | memset(mgmt, 0, 24); | |
270 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 271 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
8abd3f9b | 272 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
ae2772b3 TP |
273 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN || |
274 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
47846c9b | 275 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
46900298 JB |
276 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
277 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
13c40c54 AS |
278 | else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
279 | memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); | |
46900298 | 280 | |
44d414db JB |
281 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
282 | IEEE80211_STYPE_ACTION); | |
283 | ||
284 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); | |
285 | ||
286 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
287 | mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; | |
288 | params = (u16)(initiator << 11); /* bit 11 initiator */ | |
289 | params |= (u16)(tid << 12); /* bit 15:12 TID number */ | |
290 | ||
291 | mgmt->u.action.u.delba.params = cpu_to_le16(params); | |
292 | mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); | |
293 | ||
cf6bb79a | 294 | ieee80211_tx_skb_tid(sdata, skb, tid); |
44d414db JB |
295 | } |
296 | ||
de1ede7a JB |
297 | void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, |
298 | struct sta_info *sta, | |
299 | struct ieee80211_mgmt *mgmt, size_t len) | |
300 | { | |
de1ede7a JB |
301 | u16 tid, params; |
302 | u16 initiator; | |
de1ede7a JB |
303 | |
304 | params = le16_to_cpu(mgmt->u.action.u.delba.params); | |
305 | tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; | |
306 | initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; | |
307 | ||
bdcbd8e0 JB |
308 | ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n", |
309 | mgmt->sa, initiator ? "initiator" : "recipient", | |
310 | tid, | |
311 | le16_to_cpu(mgmt->u.action.u.delba.reason_code)); | |
de1ede7a JB |
312 | |
313 | if (initiator == WLAN_BACK_INITIATOR) | |
53f73c09 JB |
314 | __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, |
315 | true); | |
a622ab72 | 316 | else |
53f73c09 JB |
317 | __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, |
318 | true); | |
de1ede7a | 319 | } |
0f78231b JB |
320 | |
321 | int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, | |
322 | enum ieee80211_smps_mode smps, const u8 *da, | |
323 | const u8 *bssid) | |
324 | { | |
325 | struct ieee80211_local *local = sdata->local; | |
326 | struct sk_buff *skb; | |
327 | struct ieee80211_mgmt *action_frame; | |
328 | ||
329 | /* 27 = header + category + action + smps mode */ | |
330 | skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); | |
331 | if (!skb) | |
332 | return -ENOMEM; | |
333 | ||
334 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
335 | action_frame = (void *)skb_put(skb, 27); | |
336 | memcpy(action_frame->da, da, ETH_ALEN); | |
337 | memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); | |
338 | memcpy(action_frame->bssid, bssid, ETH_ALEN); | |
339 | action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
340 | IEEE80211_STYPE_ACTION); | |
341 | action_frame->u.action.category = WLAN_CATEGORY_HT; | |
342 | action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; | |
343 | switch (smps) { | |
344 | case IEEE80211_SMPS_AUTOMATIC: | |
345 | case IEEE80211_SMPS_NUM_MODES: | |
346 | WARN_ON(1); | |
347 | case IEEE80211_SMPS_OFF: | |
348 | action_frame->u.action.u.ht_smps.smps_control = | |
349 | WLAN_HT_SMPS_CONTROL_DISABLED; | |
350 | break; | |
351 | case IEEE80211_SMPS_STATIC: | |
352 | action_frame->u.action.u.ht_smps.smps_control = | |
353 | WLAN_HT_SMPS_CONTROL_STATIC; | |
354 | break; | |
355 | case IEEE80211_SMPS_DYNAMIC: | |
356 | action_frame->u.action.u.ht_smps.smps_control = | |
357 | WLAN_HT_SMPS_CONTROL_DYNAMIC; | |
358 | break; | |
359 | } | |
360 | ||
361 | /* we'll do more on status of this frame */ | |
362 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; | |
363 | ieee80211_tx_skb(sdata, skb); | |
364 | ||
365 | return 0; | |
366 | } | |
d1f5b7a3 JB |
367 | |
368 | void ieee80211_request_smps_work(struct work_struct *work) | |
369 | { | |
370 | struct ieee80211_sub_if_data *sdata = | |
371 | container_of(work, struct ieee80211_sub_if_data, | |
372 | u.mgd.request_smps_work); | |
373 | ||
374 | mutex_lock(&sdata->u.mgd.mtx); | |
375 | __ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode); | |
376 | mutex_unlock(&sdata->u.mgd.mtx); | |
377 | } | |
378 | ||
379 | void ieee80211_request_smps(struct ieee80211_vif *vif, | |
380 | enum ieee80211_smps_mode smps_mode) | |
381 | { | |
382 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
383 | ||
384 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
385 | return; | |
386 | ||
387 | if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF)) | |
388 | smps_mode = IEEE80211_SMPS_AUTOMATIC; | |
389 | ||
e4b55957 JB |
390 | sdata->u.mgd.driver_smps_mode = smps_mode; |
391 | ||
d1f5b7a3 JB |
392 | ieee80211_queue_work(&sdata->local->hw, |
393 | &sdata->u.mgd.request_smps_work); | |
394 | } | |
395 | /* this might change ... don't want non-open drivers using it */ | |
396 | EXPORT_SYMBOL_GPL(ieee80211_request_smps); |