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TOMOYO Linux Cross Reference
Linux/net/mac80211/agg-rx.c

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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         for (i = 0; i < tid_rx->buf_size; i++)
 53                 __skb_queue_purge(&tid_rx->reorder_buf[i]);
 54         kfree(tid_rx->reorder_buf);
 55         kfree(tid_rx->reorder_time);
 56         kfree(tid_rx);
 57 }
 58 
 59 void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
 60                                      u16 initiator, u16 reason, bool tx)
 61 {
 62         struct ieee80211_local *local = sta->local;
 63         struct tid_ampdu_rx *tid_rx;
 64 
 65         lockdep_assert_held(&sta->ampdu_mlme.mtx);
 66 
 67         tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid],
 68                                         lockdep_is_held(&sta->ampdu_mlme.mtx));
 69 
 70         if (!tid_rx)
 71                 return;
 72 
 73         RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL);
 74 
 75         ht_dbg(sta->sdata,
 76                "Rx BA session stop requested for %pM tid %u %s reason: %d\n",
 77                sta->sta.addr, tid,
 78                initiator == WLAN_BACK_RECIPIENT ? "recipient" : "inititator",
 79                (int)reason);
 80 
 81         if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP,
 82                              &sta->sta, tid, NULL, 0))
 83                 sdata_info(sta->sdata,
 84                            "HW problem - can not stop rx aggregation for %pM tid %d\n",
 85                            sta->sta.addr, tid);
 86 
 87         /* check if this is a self generated aggregation halt */
 88         if (initiator == WLAN_BACK_RECIPIENT && tx)
 89                 ieee80211_send_delba(sta->sdata, sta->sta.addr,
 90                                      tid, WLAN_BACK_RECIPIENT, reason);
 91 
 92         del_timer_sync(&tid_rx->session_timer);
 93 
 94         /* make sure ieee80211_sta_reorder_release() doesn't re-arm the timer */
 95         spin_lock_bh(&tid_rx->reorder_lock);
 96         tid_rx->removed = true;
 97         spin_unlock_bh(&tid_rx->reorder_lock);
 98         del_timer_sync(&tid_rx->reorder_timer);
 99 
100         call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx);
101 }
102 
103 void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
104                                     u16 initiator, u16 reason, bool tx)
105 {
106         mutex_lock(&sta->ampdu_mlme.mtx);
107         ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx);
108         mutex_unlock(&sta->ampdu_mlme.mtx);
109 }
110 
111 void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap,
112                                   const u8 *addr)
113 {
114         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
115         struct sta_info *sta;
116         int i;
117 
118         rcu_read_lock();
119         sta = sta_info_get_bss(sdata, addr);
120         if (!sta) {
121                 rcu_read_unlock();
122                 return;
123         }
124 
125         for (i = 0; i < IEEE80211_NUM_TIDS; i++)
126                 if (ba_rx_bitmap & BIT(i))
127                         set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested);
128 
129         ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
130         rcu_read_unlock();
131 }
132 EXPORT_SYMBOL(ieee80211_stop_rx_ba_session);
133 
134 /*
135  * After accepting the AddBA Request we activated a timer,
136  * resetting it after each frame that arrives from the originator.
137  */
138 static void sta_rx_agg_session_timer_expired(unsigned long data)
139 {
140         /* not an elegant detour, but there is no choice as the timer passes
141          * only one argument, and various sta_info are needed here, so init
142          * flow in sta_info_create gives the TID as data, while the timer_to_id
143          * array gives the sta through container_of */
144         u8 *ptid = (u8 *)data;
145         u8 *timer_to_id = ptid - *ptid;
146         struct sta_info *sta = container_of(timer_to_id, struct sta_info,
147                                          timer_to_tid[0]);
148         struct tid_ampdu_rx *tid_rx;
149         unsigned long timeout;
150 
151         rcu_read_lock();
152         tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[*ptid]);
153         if (!tid_rx) {
154                 rcu_read_unlock();
155                 return;
156         }
157 
158         timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout);
159         if (time_is_after_jiffies(timeout)) {
160                 mod_timer(&tid_rx->session_timer, timeout);
161                 rcu_read_unlock();
162                 return;
163         }
164         rcu_read_unlock();
165 
166         ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n",
167                sta->sta.addr, (u16)*ptid);
168 
169         set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired);
170         ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
171 }
172 
173 static void sta_rx_agg_reorder_timer_expired(unsigned long data)
174 {
175         u8 *ptid = (u8 *)data;
176         u8 *timer_to_id = ptid - *ptid;
177         struct sta_info *sta = container_of(timer_to_id, struct sta_info,
178                         timer_to_tid[0]);
179 
180         rcu_read_lock();
181         ieee80211_release_reorder_timeout(sta, *ptid);
182         rcu_read_unlock();
183 }
184 
185 static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
186                                       u8 dialog_token, u16 status, u16 policy,
187                                       u16 buf_size, u16 timeout)
188 {
189         struct ieee80211_local *local = sdata->local;
190         struct sk_buff *skb;
191         struct ieee80211_mgmt *mgmt;
192         u16 capab;
193 
194         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
195         if (!skb)
196                 return;
197 
198         skb_reserve(skb, local->hw.extra_tx_headroom);
199         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
200         memset(mgmt, 0, 24);
201         memcpy(mgmt->da, da, ETH_ALEN);
202         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
203         if (sdata->vif.type == NL80211_IFTYPE_AP ||
204             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
205             sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
206                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
207         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
208                 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
209         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
210                 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
211 
212         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
213                                           IEEE80211_STYPE_ACTION);
214 
215         skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
216         mgmt->u.action.category = WLAN_CATEGORY_BACK;
217         mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
218         mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
219 
220         capab = (u16)(policy << 1);     /* bit 1 aggregation policy */
221         capab |= (u16)(tid << 2);       /* bit 5:2 TID number */
222         capab |= (u16)(buf_size << 6);  /* bit 15:6 max size of aggregation */
223 
224         mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
225         mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
226         mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
227 
228         ieee80211_tx_skb(sdata, skb);
229 }
230 
231 void __ieee80211_start_rx_ba_session(struct sta_info *sta,
232                                      u8 dialog_token, u16 timeout,
233                                      u16 start_seq_num, u16 ba_policy, u16 tid,
234                                      u16 buf_size, bool tx, bool auto_seq)
235 {
236         struct ieee80211_local *local = sta->sdata->local;
237         struct tid_ampdu_rx *tid_agg_rx;
238         int i, ret = -EOPNOTSUPP;
239         u16 status = WLAN_STATUS_REQUEST_DECLINED;
240 
241         if (!sta->sta.ht_cap.ht_supported) {
242                 ht_dbg(sta->sdata,
243                        "STA %pM erroneously requests BA session on tid %d w/o QoS\n",
244                        sta->sta.addr, tid);
245                 /* send a response anyway, it's an error case if we get here */
246                 goto end_no_lock;
247         }
248 
249         if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
250                 ht_dbg(sta->sdata,
251                        "Suspend in progress - Denying ADDBA request (%pM tid %d)\n",
252                        sta->sta.addr, tid);
253                 goto end_no_lock;
254         }
255 
256         /* sanity check for incoming parameters:
257          * check if configuration can support the BA policy
258          * and if buffer size does not exceeds max value */
259         /* XXX: check own ht delayed BA capability?? */
260         if (((ba_policy != 1) &&
261              (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) ||
262             (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
263                 status = WLAN_STATUS_INVALID_QOS_PARAM;
264                 ht_dbg_ratelimited(sta->sdata,
265                                    "AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n",
266                                    sta->sta.addr, tid, ba_policy, buf_size);
267                 goto end_no_lock;
268         }
269         /* determine default buffer size */
270         if (buf_size == 0)
271                 buf_size = IEEE80211_MAX_AMPDU_BUF;
272 
273         /* make sure the size doesn't exceed the maximum supported by the hw */
274         if (buf_size > local->hw.max_rx_aggregation_subframes)
275                 buf_size = local->hw.max_rx_aggregation_subframes;
276 
277         /* examine state machine */
278         mutex_lock(&sta->ampdu_mlme.mtx);
279 
280         if (sta->ampdu_mlme.tid_rx[tid]) {
281                 ht_dbg_ratelimited(sta->sdata,
282                                    "unexpected AddBA Req from %pM on tid %u\n",
283                                    sta->sta.addr, tid);
284 
285                 /* delete existing Rx BA session on the same tid */
286                 ___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
287                                                 WLAN_STATUS_UNSPECIFIED_QOS,
288                                                 false);
289         }
290 
291         /* prepare A-MPDU MLME for Rx aggregation */
292         tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_KERNEL);
293         if (!tid_agg_rx)
294                 goto end;
295 
296         spin_lock_init(&tid_agg_rx->reorder_lock);
297 
298         /* rx timer */
299         tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired;
300         tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
301         init_timer_deferrable(&tid_agg_rx->session_timer);
302 
303         /* rx reorder timer */
304         tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired;
305         tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid];
306         init_timer(&tid_agg_rx->reorder_timer);
307 
308         /* prepare reordering buffer */
309         tid_agg_rx->reorder_buf =
310                 kcalloc(buf_size, sizeof(struct sk_buff_head), GFP_KERNEL);
311         tid_agg_rx->reorder_time =
312                 kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL);
313         if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) {
314                 kfree(tid_agg_rx->reorder_buf);
315                 kfree(tid_agg_rx->reorder_time);
316                 kfree(tid_agg_rx);
317                 goto end;
318         }
319 
320         for (i = 0; i < buf_size; i++)
321                 __skb_queue_head_init(&tid_agg_rx->reorder_buf[i]);
322 
323         ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
324                                &sta->sta, tid, &start_seq_num, 0);
325         ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n",
326                sta->sta.addr, tid, ret);
327         if (ret) {
328                 kfree(tid_agg_rx->reorder_buf);
329                 kfree(tid_agg_rx->reorder_time);
330                 kfree(tid_agg_rx);
331                 goto end;
332         }
333 
334         /* update data */
335         tid_agg_rx->dialog_token = dialog_token;
336         tid_agg_rx->ssn = start_seq_num;
337         tid_agg_rx->head_seq_num = start_seq_num;
338         tid_agg_rx->buf_size = buf_size;
339         tid_agg_rx->timeout = timeout;
340         tid_agg_rx->stored_mpdu_num = 0;
341         tid_agg_rx->auto_seq = auto_seq;
342         status = WLAN_STATUS_SUCCESS;
343 
344         /* activate it for RX */
345         rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx);
346 
347         if (timeout) {
348                 mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout));
349                 tid_agg_rx->last_rx = jiffies;
350         }
351 
352 end:
353         mutex_unlock(&sta->ampdu_mlme.mtx);
354 
355 end_no_lock:
356         if (tx)
357                 ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
358                                           dialog_token, status, 1, buf_size,
359                                           timeout);
360 }
361 
362 void ieee80211_process_addba_request(struct ieee80211_local *local,
363                                      struct sta_info *sta,
364                                      struct ieee80211_mgmt *mgmt,
365                                      size_t len)
366 {
367         u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num;
368         u8 dialog_token;
369 
370         /* extract session parameters from addba request frame */
371         dialog_token = mgmt->u.action.u.addba_req.dialog_token;
372         timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
373         start_seq_num =
374                 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
375 
376         capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
377         ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
378         tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
379         buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
380 
381         __ieee80211_start_rx_ba_session(sta, dialog_token, timeout,
382                                         start_seq_num, ba_policy, tid,
383                                         buf_size, true, false);
384 }
385 
386 void ieee80211_start_rx_ba_session_offl(struct ieee80211_vif *vif,
387                                         const u8 *addr, u16 tid)
388 {
389         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
390         struct ieee80211_local *local = sdata->local;
391         struct ieee80211_rx_agg *rx_agg;
392         struct sk_buff *skb = dev_alloc_skb(0);
393 
394         if (unlikely(!skb))
395                 return;
396 
397         rx_agg = (struct ieee80211_rx_agg *) &skb->cb;
398         memcpy(&rx_agg->addr, addr, ETH_ALEN);
399         rx_agg->tid = tid;
400 
401         skb->pkt_type = IEEE80211_SDATA_QUEUE_RX_AGG_START;
402         skb_queue_tail(&sdata->skb_queue, skb);
403         ieee80211_queue_work(&local->hw, &sdata->work);
404 }
405 EXPORT_SYMBOL(ieee80211_start_rx_ba_session_offl);
406 
407 void ieee80211_stop_rx_ba_session_offl(struct ieee80211_vif *vif,
408                                        const u8 *addr, u16 tid)
409 {
410         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
411         struct ieee80211_local *local = sdata->local;
412         struct ieee80211_rx_agg *rx_agg;
413         struct sk_buff *skb = dev_alloc_skb(0);
414 
415         if (unlikely(!skb))
416                 return;
417 
418         rx_agg = (struct ieee80211_rx_agg *) &skb->cb;
419         memcpy(&rx_agg->addr, addr, ETH_ALEN);
420         rx_agg->tid = tid;
421 
422         skb->pkt_type = IEEE80211_SDATA_QUEUE_RX_AGG_STOP;
423         skb_queue_tail(&sdata->skb_queue, skb);
424         ieee80211_queue_work(&local->hw, &sdata->work);
425 }
426 EXPORT_SYMBOL(ieee80211_stop_rx_ba_session_offl);
427 

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