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b8695a8f JB |
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 2007-2008, 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" | |
24487981 | 19 | #include "driver-ops.h" |
b8695a8f | 20 | |
849b7967 JB |
21 | void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, |
22 | u16 initiator, u16 reason) | |
b8695a8f | 23 | { |
d75636ef | 24 | struct ieee80211_local *local = sta->local; |
d75636ef | 25 | int i; |
b8695a8f JB |
26 | |
27 | /* check if TID is in operational state */ | |
28 | spin_lock_bh(&sta->lock); | |
d75636ef | 29 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) { |
b8695a8f | 30 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
31 | return; |
32 | } | |
d75636ef | 33 | |
b8695a8f JB |
34 | sta->ampdu_mlme.tid_state_rx[tid] = |
35 | HT_AGG_STATE_REQ_STOP_BA_MSK | | |
36 | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); | |
37 | spin_unlock_bh(&sta->lock); | |
38 | ||
b8695a8f JB |
39 | #ifdef CONFIG_MAC80211_HT_DEBUG |
40 | printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n", | |
d75636ef | 41 | sta->sta.addr, tid); |
b8695a8f JB |
42 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
43 | ||
c951ad35 JB |
44 | if (drv_ampdu_action(local, &sta->sdata->vif, |
45 | IEEE80211_AMPDU_RX_STOP, | |
24487981 | 46 | &sta->sta, tid, NULL)) |
b8695a8f JB |
47 | printk(KERN_DEBUG "HW problem - can not stop rx " |
48 | "aggregation for tid %d\n", tid); | |
49 | ||
50 | /* shutdown timer has not expired */ | |
51 | if (initiator != WLAN_BACK_TIMER) | |
52 | del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer); | |
53 | ||
54 | /* check if this is a self generated aggregation halt */ | |
55 | if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER) | |
d75636ef JB |
56 | ieee80211_send_delba(sta->sdata, sta->sta.addr, |
57 | tid, 0, reason); | |
b8695a8f JB |
58 | |
59 | /* free the reordering buffer */ | |
60 | for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) { | |
61 | if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) { | |
62 | /* release the reordered frames */ | |
63 | dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]); | |
64 | sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--; | |
65 | sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL; | |
66 | } | |
67 | } | |
55687e38 JB |
68 | |
69 | spin_lock_bh(&sta->lock); | |
b8695a8f JB |
70 | /* free resources */ |
71 | kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf); | |
4d050f1d | 72 | kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_time); |
55687e38 JB |
73 | |
74 | if (!sta->ampdu_mlme.tid_rx[tid]->shutdown) { | |
75 | kfree(sta->ampdu_mlme.tid_rx[tid]); | |
76 | sta->ampdu_mlme.tid_rx[tid] = NULL; | |
77 | } | |
78 | ||
b8695a8f | 79 | sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE; |
55687e38 | 80 | spin_unlock_bh(&sta->lock); |
d75636ef JB |
81 | } |
82 | ||
83 | void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, | |
84 | u16 initiator, u16 reason) | |
85 | { | |
86 | struct ieee80211_local *local = sdata->local; | |
87 | struct sta_info *sta; | |
88 | ||
89 | /* stop HW Rx aggregation. ampdu_action existence | |
90 | * already verified in session init so we add the BUG_ON */ | |
91 | BUG_ON(!local->ops->ampdu_action); | |
92 | ||
93 | rcu_read_lock(); | |
94 | ||
95 | sta = sta_info_get(local, ra); | |
96 | if (!sta) { | |
97 | rcu_read_unlock(); | |
98 | return; | |
99 | } | |
100 | ||
849b7967 | 101 | __ieee80211_stop_rx_ba_session(sta, tid, initiator, reason); |
b8695a8f JB |
102 | |
103 | rcu_read_unlock(); | |
104 | } | |
105 | ||
106 | /* | |
107 | * After accepting the AddBA Request we activated a timer, | |
108 | * resetting it after each frame that arrives from the originator. | |
109 | * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed. | |
110 | */ | |
111 | static void sta_rx_agg_session_timer_expired(unsigned long data) | |
112 | { | |
113 | /* not an elegant detour, but there is no choice as the timer passes | |
114 | * only one argument, and various sta_info are needed here, so init | |
115 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
116 | * array gives the sta through container_of */ | |
117 | u8 *ptid = (u8 *)data; | |
118 | u8 *timer_to_id = ptid - *ptid; | |
119 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, | |
120 | timer_to_tid[0]); | |
121 | ||
122 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
123 | printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid); | |
124 | #endif | |
125 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, | |
126 | (u16)*ptid, WLAN_BACK_TIMER, | |
127 | WLAN_REASON_QSTA_TIMEOUT); | |
128 | } | |
129 | ||
130 | static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid, | |
131 | u8 dialog_token, u16 status, u16 policy, | |
132 | u16 buf_size, u16 timeout) | |
133 | { | |
b8695a8f JB |
134 | struct ieee80211_local *local = sdata->local; |
135 | struct sk_buff *skb; | |
136 | struct ieee80211_mgmt *mgmt; | |
137 | u16 capab; | |
138 | ||
139 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
140 | ||
141 | if (!skb) { | |
142 | printk(KERN_DEBUG "%s: failed to allocate buffer " | |
143 | "for addba resp frame\n", sdata->dev->name); | |
144 | return; | |
145 | } | |
146 | ||
147 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
148 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
149 | memset(mgmt, 0, 24); | |
150 | memcpy(mgmt->da, da, ETH_ALEN); | |
151 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
8abd3f9b JB |
152 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
153 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
b8695a8f | 154 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
46900298 JB |
155 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
156 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
157 | ||
b8695a8f JB |
158 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
159 | IEEE80211_STYPE_ACTION); | |
160 | ||
161 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); | |
162 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
163 | mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; | |
164 | mgmt->u.action.u.addba_resp.dialog_token = dialog_token; | |
165 | ||
166 | capab = (u16)(policy << 1); /* bit 1 aggregation policy */ | |
167 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
168 | capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */ | |
169 | ||
170 | mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); | |
171 | mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); | |
172 | mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); | |
173 | ||
174 | ieee80211_tx_skb(sdata, skb, 1); | |
175 | } | |
176 | ||
177 | void ieee80211_process_addba_request(struct ieee80211_local *local, | |
178 | struct sta_info *sta, | |
179 | struct ieee80211_mgmt *mgmt, | |
180 | size_t len) | |
181 | { | |
182 | struct ieee80211_hw *hw = &local->hw; | |
183 | struct ieee80211_conf *conf = &hw->conf; | |
184 | struct tid_ampdu_rx *tid_agg_rx; | |
185 | u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status; | |
186 | u8 dialog_token; | |
187 | int ret = -EOPNOTSUPP; | |
188 | ||
189 | /* extract session parameters from addba request frame */ | |
190 | dialog_token = mgmt->u.action.u.addba_req.dialog_token; | |
191 | timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); | |
192 | start_seq_num = | |
193 | le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; | |
194 | ||
195 | capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); | |
196 | ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; | |
197 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
198 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; | |
199 | ||
200 | status = WLAN_STATUS_REQUEST_DECLINED; | |
201 | ||
722f069a S |
202 | if (test_sta_flags(sta, WLAN_STA_SUSPEND)) { |
203 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
204 | printk(KERN_DEBUG "Suspend in progress. " | |
205 | "Denying ADDBA request\n"); | |
206 | #endif | |
207 | goto end_no_lock; | |
208 | } | |
209 | ||
b8695a8f JB |
210 | /* sanity check for incoming parameters: |
211 | * check if configuration can support the BA policy | |
212 | * and if buffer size does not exceeds max value */ | |
213 | /* XXX: check own ht delayed BA capability?? */ | |
214 | if (((ba_policy != 1) | |
215 | && (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) | |
216 | || (buf_size > IEEE80211_MAX_AMPDU_BUF)) { | |
217 | status = WLAN_STATUS_INVALID_QOS_PARAM; | |
218 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
219 | if (net_ratelimit()) | |
220 | printk(KERN_DEBUG "AddBA Req with bad params from " | |
221 | "%pM on tid %u. policy %d, buffer size %d\n", | |
222 | mgmt->sa, tid, ba_policy, | |
223 | buf_size); | |
224 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
225 | goto end_no_lock; | |
226 | } | |
227 | /* determine default buffer size */ | |
228 | if (buf_size == 0) { | |
229 | struct ieee80211_supported_band *sband; | |
230 | ||
231 | sband = local->hw.wiphy->bands[conf->channel->band]; | |
232 | buf_size = IEEE80211_MIN_AMPDU_BUF; | |
233 | buf_size = buf_size << sband->ht_cap.ampdu_factor; | |
234 | } | |
235 | ||
236 | ||
237 | /* examine state machine */ | |
238 | spin_lock_bh(&sta->lock); | |
239 | ||
240 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) { | |
241 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
242 | if (net_ratelimit()) | |
243 | printk(KERN_DEBUG "unexpected AddBA Req from " | |
244 | "%pM on tid %u\n", | |
245 | mgmt->sa, tid); | |
246 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
247 | goto end; | |
248 | } | |
249 | ||
250 | /* prepare A-MPDU MLME for Rx aggregation */ | |
251 | sta->ampdu_mlme.tid_rx[tid] = | |
252 | kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC); | |
253 | if (!sta->ampdu_mlme.tid_rx[tid]) { | |
254 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
255 | if (net_ratelimit()) | |
256 | printk(KERN_ERR "allocate rx mlme to tid %d failed\n", | |
257 | tid); | |
258 | #endif | |
259 | goto end; | |
260 | } | |
261 | /* rx timer */ | |
262 | sta->ampdu_mlme.tid_rx[tid]->session_timer.function = | |
263 | sta_rx_agg_session_timer_expired; | |
264 | sta->ampdu_mlme.tid_rx[tid]->session_timer.data = | |
265 | (unsigned long)&sta->timer_to_tid[tid]; | |
266 | init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer); | |
267 | ||
268 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; | |
269 | ||
270 | /* prepare reordering buffer */ | |
271 | tid_agg_rx->reorder_buf = | |
272 | kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC); | |
4d050f1d JM |
273 | tid_agg_rx->reorder_time = |
274 | kcalloc(buf_size, sizeof(unsigned long), GFP_ATOMIC); | |
275 | if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { | |
b8695a8f JB |
276 | #ifdef CONFIG_MAC80211_HT_DEBUG |
277 | if (net_ratelimit()) | |
278 | printk(KERN_ERR "can not allocate reordering buffer " | |
279 | "to tid %d\n", tid); | |
280 | #endif | |
4d050f1d JM |
281 | kfree(tid_agg_rx->reorder_buf); |
282 | kfree(tid_agg_rx->reorder_time); | |
b8695a8f | 283 | kfree(sta->ampdu_mlme.tid_rx[tid]); |
4d050f1d | 284 | sta->ampdu_mlme.tid_rx[tid] = NULL; |
b8695a8f JB |
285 | goto end; |
286 | } | |
287 | ||
c951ad35 JB |
288 | ret = drv_ampdu_action(local, &sta->sdata->vif, |
289 | IEEE80211_AMPDU_RX_START, | |
24487981 | 290 | &sta->sta, tid, &start_seq_num); |
b8695a8f JB |
291 | #ifdef CONFIG_MAC80211_HT_DEBUG |
292 | printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret); | |
293 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
294 | ||
295 | if (ret) { | |
296 | kfree(tid_agg_rx->reorder_buf); | |
297 | kfree(tid_agg_rx); | |
298 | sta->ampdu_mlme.tid_rx[tid] = NULL; | |
299 | goto end; | |
300 | } | |
301 | ||
302 | /* change state and send addba resp */ | |
303 | sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL; | |
304 | tid_agg_rx->dialog_token = dialog_token; | |
305 | tid_agg_rx->ssn = start_seq_num; | |
306 | tid_agg_rx->head_seq_num = start_seq_num; | |
307 | tid_agg_rx->buf_size = buf_size; | |
308 | tid_agg_rx->timeout = timeout; | |
309 | tid_agg_rx->stored_mpdu_num = 0; | |
310 | status = WLAN_STATUS_SUCCESS; | |
311 | end: | |
312 | spin_unlock_bh(&sta->lock); | |
313 | ||
314 | end_no_lock: | |
315 | ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid, | |
316 | dialog_token, status, 1, buf_size, timeout); | |
317 | } |