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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 | /** |
17 | * DOC: RX A-MPDU aggregation |
18 | * |
19 | * Aggregation on the RX side requires only implementing the |
20 | * @ampdu_action callback that is invoked to start/stop any |
21 | * block-ack sessions for RX aggregation. |
22 | * |
23 | * When RX aggregation is started by the peer, the driver is |
24 | * notified via @ampdu_action function, with the |
25 | * %IEEE80211_AMPDU_RX_START action, and may reject the request |
26 | * in which case a negative response is sent to the peer, if it |
27 | * accepts it a positive response is sent. |
28 | * |
29 | * While the session is active, the device/driver are required |
30 | * to de-aggregate frames and pass them up one by one to mac80211, |
31 | * which will handle the reorder buffer. |
32 | * |
33 | * When the aggregation session is stopped again by the peer or |
34 | * ourselves, the driver's @ampdu_action function will be called |
35 | * with the action %IEEE80211_AMPDU_RX_STOP. In this case, the |
36 | * call must not fail. |
37 | */ |
38 | |
39 | #include <linux/ieee80211.h> |
40 | #include <linux/slab.h> |
41 | #include <linux/export.h> |
42 | #include <net/mac80211.h> |
43 | #include "ieee80211_i.h" |
44 | #include "driver-ops.h" |
45 | |
46 | static void ieee80211_free_tid_rx(struct rcu_head *h) |
47 | { |
48 | struct tid_ampdu_rx *tid_rx = |
49 | container_of(h, struct tid_ampdu_rx, rcu_head); |
50 | int i; |
51 | |
52 | del_timer_sync(&tid_rx->reorder_timer); |
53 | |
54 | for (i = 0; i < tid_rx->buf_size; i++) |
55 | dev_kfree_skb(tid_rx->reorder_buf[i]); |
56 | kfree(tid_rx->reorder_buf); |
57 | kfree(tid_rx->reorder_time); |
58 | kfree(tid_rx); |
59 | } |
60 | |
61 | void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, |
62 | u16 initiator, u16 reason, bool tx) |
63 | { |
64 | struct ieee80211_local *local = sta->local; |
65 | struct tid_ampdu_rx *tid_rx; |
66 | |
67 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
68 | |
69 | tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid], |
70 | lockdep_is_held(&sta->ampdu_mlme.mtx)); |
71 | |
72 | if (!tid_rx) |
73 | return; |
74 | |
75 | RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL); |
76 | |
77 | #ifdef CONFIG_MAC80211_HT_DEBUG |
78 | printk(KERN_DEBUG |
79 | "Rx BA session stop requested for %pM tid %u %s reason: %d\n", |
80 | sta->sta.addr, tid, |
81 | initiator == WLAN_BACK_RECIPIENT ? "recipient" : "inititator", |
82 | (int)reason); |
83 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
84 | |
85 | if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP, |
86 | &sta->sta, tid, NULL, 0)) |
87 | printk(KERN_DEBUG "HW problem - can not stop rx " |
88 | "aggregation for tid %d\n", tid); |
89 | |
90 | /* check if this is a self generated aggregation halt */ |
91 | if (initiator == WLAN_BACK_RECIPIENT && tx) |
92 | ieee80211_send_delba(sta->sdata, sta->sta.addr, |
93 | tid, WLAN_BACK_RECIPIENT, reason); |
94 | |
95 | del_timer_sync(&tid_rx->session_timer); |
96 | |
97 | call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx); |
98 | } |
99 | |
100 | void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, |
101 | u16 initiator, u16 reason, bool tx) |
102 | { |
103 | mutex_lock(&sta->ampdu_mlme.mtx); |
104 | ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx); |
105 | mutex_unlock(&sta->ampdu_mlme.mtx); |
106 | } |
107 | |
108 | void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap, |
109 | const u8 *addr) |
110 | { |
111 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
112 | struct sta_info *sta; |
113 | int i; |
114 | |
115 | rcu_read_lock(); |
116 | sta = sta_info_get_bss(sdata, addr); |
117 | if (!sta) { |
118 | rcu_read_unlock(); |
119 | return; |
120 | } |
121 | |
122 | for (i = 0; i < STA_TID_NUM; i++) |
123 | if (ba_rx_bitmap & BIT(i)) |
124 | set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested); |
125 | |
126 | ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work); |
127 | rcu_read_unlock(); |
128 | } |
129 | EXPORT_SYMBOL(ieee80211_stop_rx_ba_session); |
130 | |
131 | /* |
132 | * After accepting the AddBA Request we activated a timer, |
133 | * resetting it after each frame that arrives from the originator. |
134 | */ |
135 | static void sta_rx_agg_session_timer_expired(unsigned long data) |
136 | { |
137 | /* not an elegant detour, but there is no choice as the timer passes |
138 | * only one argument, and various sta_info are needed here, so init |
139 | * flow in sta_info_create gives the TID as data, while the timer_to_id |
140 | * array gives the sta through container_of */ |
141 | u8 *ptid = (u8 *)data; |
142 | u8 *timer_to_id = ptid - *ptid; |
143 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, |
144 | timer_to_tid[0]); |
145 | |
146 | #ifdef CONFIG_MAC80211_HT_DEBUG |
147 | printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid); |
148 | #endif |
149 | set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired); |
150 | ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work); |
151 | } |
152 | |
153 | static void sta_rx_agg_reorder_timer_expired(unsigned long data) |
154 | { |
155 | u8 *ptid = (u8 *)data; |
156 | u8 *timer_to_id = ptid - *ptid; |
157 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, |
158 | timer_to_tid[0]); |
159 | |
160 | rcu_read_lock(); |
161 | ieee80211_release_reorder_timeout(sta, *ptid); |
162 | rcu_read_unlock(); |
163 | } |
164 | |
165 | static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid, |
166 | u8 dialog_token, u16 status, u16 policy, |
167 | u16 buf_size, u16 timeout) |
168 | { |
169 | struct ieee80211_local *local = sdata->local; |
170 | struct sk_buff *skb; |
171 | struct ieee80211_mgmt *mgmt; |
172 | u16 capab; |
173 | |
174 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); |
175 | if (!skb) |
176 | return; |
177 | |
178 | skb_reserve(skb, local->hw.extra_tx_headroom); |
179 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); |
180 | memset(mgmt, 0, 24); |
181 | memcpy(mgmt->da, da, ETH_ALEN); |
182 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
183 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
184 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN || |
185 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
186 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
187 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
188 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
189 | else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
190 | memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); |
191 | |
192 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
193 | IEEE80211_STYPE_ACTION); |
194 | |
195 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); |
196 | mgmt->u.action.category = WLAN_CATEGORY_BACK; |
197 | mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; |
198 | mgmt->u.action.u.addba_resp.dialog_token = dialog_token; |
199 | |
200 | capab = (u16)(policy << 1); /* bit 1 aggregation policy */ |
201 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ |
202 | capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */ |
203 | |
204 | mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); |
205 | mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); |
206 | mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); |
207 | |
208 | ieee80211_tx_skb(sdata, skb); |
209 | } |
210 | |
211 | void ieee80211_process_addba_request(struct ieee80211_local *local, |
212 | struct sta_info *sta, |
213 | struct ieee80211_mgmt *mgmt, |
214 | size_t len) |
215 | { |
216 | struct tid_ampdu_rx *tid_agg_rx; |
217 | u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status; |
218 | u8 dialog_token; |
219 | int ret = -EOPNOTSUPP; |
220 | |
221 | /* extract session parameters from addba request frame */ |
222 | dialog_token = mgmt->u.action.u.addba_req.dialog_token; |
223 | timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); |
224 | start_seq_num = |
225 | le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; |
226 | |
227 | capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); |
228 | ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; |
229 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; |
230 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
231 | |
232 | status = WLAN_STATUS_REQUEST_DECLINED; |
233 | |
234 | if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
235 | #ifdef CONFIG_MAC80211_HT_DEBUG |
236 | printk(KERN_DEBUG "Suspend in progress. " |
237 | "Denying ADDBA request\n"); |
238 | #endif |
239 | goto end_no_lock; |
240 | } |
241 | |
242 | /* sanity check for incoming parameters: |
243 | * check if configuration can support the BA policy |
244 | * and if buffer size does not exceeds max value */ |
245 | /* XXX: check own ht delayed BA capability?? */ |
246 | if (((ba_policy != 1) && |
247 | (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) || |
248 | (buf_size > IEEE80211_MAX_AMPDU_BUF)) { |
249 | status = WLAN_STATUS_INVALID_QOS_PARAM; |
250 | #ifdef CONFIG_MAC80211_HT_DEBUG |
251 | if (net_ratelimit()) |
252 | printk(KERN_DEBUG "AddBA Req with bad params from " |
253 | "%pM on tid %u. policy %d, buffer size %d\n", |
254 | mgmt->sa, tid, ba_policy, |
255 | buf_size); |
256 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
257 | goto end_no_lock; |
258 | } |
259 | /* determine default buffer size */ |
260 | if (buf_size == 0) |
261 | buf_size = IEEE80211_MAX_AMPDU_BUF; |
262 | |
263 | /* make sure the size doesn't exceed the maximum supported by the hw */ |
264 | if (buf_size > local->hw.max_rx_aggregation_subframes) |
265 | buf_size = local->hw.max_rx_aggregation_subframes; |
266 | |
267 | /* examine state machine */ |
268 | mutex_lock(&sta->ampdu_mlme.mtx); |
269 | |
270 | if (sta->ampdu_mlme.tid_rx[tid]) { |
271 | #ifdef CONFIG_MAC80211_HT_DEBUG |
272 | if (net_ratelimit()) |
273 | printk(KERN_DEBUG "unexpected AddBA Req from " |
274 | "%pM on tid %u\n", |
275 | mgmt->sa, tid); |
276 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
277 | |
278 | /* delete existing Rx BA session on the same tid */ |
279 | ___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, |
280 | WLAN_STATUS_UNSPECIFIED_QOS, |
281 | false); |
282 | } |
283 | |
284 | /* prepare A-MPDU MLME for Rx aggregation */ |
285 | tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_KERNEL); |
286 | if (!tid_agg_rx) |
287 | goto end; |
288 | |
289 | spin_lock_init(&tid_agg_rx->reorder_lock); |
290 | |
291 | /* rx timer */ |
292 | tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired; |
293 | tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; |
294 | init_timer(&tid_agg_rx->session_timer); |
295 | |
296 | /* rx reorder timer */ |
297 | tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired; |
298 | tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid]; |
299 | init_timer(&tid_agg_rx->reorder_timer); |
300 | |
301 | /* prepare reordering buffer */ |
302 | tid_agg_rx->reorder_buf = |
303 | kcalloc(buf_size, sizeof(struct sk_buff *), GFP_KERNEL); |
304 | tid_agg_rx->reorder_time = |
305 | kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL); |
306 | if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { |
307 | kfree(tid_agg_rx->reorder_buf); |
308 | kfree(tid_agg_rx->reorder_time); |
309 | kfree(tid_agg_rx); |
310 | goto end; |
311 | } |
312 | |
313 | ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START, |
314 | &sta->sta, tid, &start_seq_num, 0); |
315 | #ifdef CONFIG_MAC80211_HT_DEBUG |
316 | printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret); |
317 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
318 | |
319 | if (ret) { |
320 | kfree(tid_agg_rx->reorder_buf); |
321 | kfree(tid_agg_rx->reorder_time); |
322 | kfree(tid_agg_rx); |
323 | goto end; |
324 | } |
325 | |
326 | /* update data */ |
327 | tid_agg_rx->dialog_token = dialog_token; |
328 | tid_agg_rx->ssn = start_seq_num; |
329 | tid_agg_rx->head_seq_num = start_seq_num; |
330 | tid_agg_rx->buf_size = buf_size; |
331 | tid_agg_rx->timeout = timeout; |
332 | tid_agg_rx->stored_mpdu_num = 0; |
333 | status = WLAN_STATUS_SUCCESS; |
334 | |
335 | /* activate it for RX */ |
336 | rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx); |
337 | |
338 | if (timeout) |
339 | mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout)); |
340 | |
341 | end: |
342 | mutex_unlock(&sta->ampdu_mlme.mtx); |
343 | |
344 | end_no_lock: |
345 | ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid, |
346 | dialog_token, status, 1, buf_size, timeout); |
347 | } |
348 |
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