pptp: pptp_rcv_core() misses pskb_may_pull() call
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / agg-rx.c
blobfd1aaf2a4a6c47eae03cd40c469055d86be12a14
1 /*
2 * HT handling
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
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.
16 /**
17 * DOC: RX A-MPDU aggregation
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.
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.
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.
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.
39 #include <linux/ieee80211.h>
40 #include <linux/slab.h>
41 #include <net/mac80211.h>
42 #include "ieee80211_i.h"
43 #include "driver-ops.h"
45 static void ieee80211_free_tid_rx(struct rcu_head *h)
47 struct tid_ampdu_rx *tid_rx =
48 container_of(h, struct tid_ampdu_rx, rcu_head);
49 int i;
51 for (i = 0; i < tid_rx->buf_size; i++)
52 dev_kfree_skb(tid_rx->reorder_buf[i]);
53 kfree(tid_rx->reorder_buf);
54 kfree(tid_rx->reorder_time);
55 kfree(tid_rx);
58 void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
59 u16 initiator, u16 reason, bool tx)
61 struct ieee80211_local *local = sta->local;
62 struct tid_ampdu_rx *tid_rx;
64 lockdep_assert_held(&sta->ampdu_mlme.mtx);
66 tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid],
67 lockdep_is_held(&sta->ampdu_mlme.mtx));
69 if (!tid_rx)
70 return;
72 rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], NULL);
74 #ifdef CONFIG_MAC80211_HT_DEBUG
75 printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
76 sta->sta.addr, tid);
77 #endif /* CONFIG_MAC80211_HT_DEBUG */
79 if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP,
80 &sta->sta, tid, NULL, 0))
81 printk(KERN_DEBUG "HW problem - can not stop rx "
82 "aggregation for tid %d\n", tid);
84 /* check if this is a self generated aggregation halt */
85 if (initiator == WLAN_BACK_RECIPIENT && tx)
86 ieee80211_send_delba(sta->sdata, sta->sta.addr,
87 tid, 0, reason);
89 del_timer_sync(&tid_rx->session_timer);
90 del_timer_sync(&tid_rx->reorder_timer);
92 call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx);
95 void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
96 u16 initiator, u16 reason, bool tx)
98 mutex_lock(&sta->ampdu_mlme.mtx);
99 ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx);
100 mutex_unlock(&sta->ampdu_mlme.mtx);
103 void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap,
104 const u8 *addr)
106 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
107 struct sta_info *sta;
108 int i;
110 rcu_read_lock();
111 sta = sta_info_get(sdata, addr);
112 if (!sta) {
113 rcu_read_unlock();
114 return;
117 for (i = 0; i < STA_TID_NUM; i++)
118 if (ba_rx_bitmap & BIT(i))
119 set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested);
121 ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
122 rcu_read_unlock();
124 EXPORT_SYMBOL(ieee80211_stop_rx_ba_session);
127 * After accepting the AddBA Request we activated a timer,
128 * resetting it after each frame that arrives from the originator.
130 static void sta_rx_agg_session_timer_expired(unsigned long data)
132 /* not an elegant detour, but there is no choice as the timer passes
133 * only one argument, and various sta_info are needed here, so init
134 * flow in sta_info_create gives the TID as data, while the timer_to_id
135 * array gives the sta through container_of */
136 u8 *ptid = (u8 *)data;
137 u8 *timer_to_id = ptid - *ptid;
138 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
139 timer_to_tid[0]);
141 #ifdef CONFIG_MAC80211_HT_DEBUG
142 printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
143 #endif
144 set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired);
145 ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
148 static void sta_rx_agg_reorder_timer_expired(unsigned long data)
150 u8 *ptid = (u8 *)data;
151 u8 *timer_to_id = ptid - *ptid;
152 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
153 timer_to_tid[0]);
155 rcu_read_lock();
156 ieee80211_release_reorder_timeout(sta, *ptid);
157 rcu_read_unlock();
160 static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
161 u8 dialog_token, u16 status, u16 policy,
162 u16 buf_size, u16 timeout)
164 struct ieee80211_local *local = sdata->local;
165 struct sk_buff *skb;
166 struct ieee80211_mgmt *mgmt;
167 u16 capab;
169 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
171 if (!skb) {
172 printk(KERN_DEBUG "%s: failed to allocate buffer "
173 "for addba resp frame\n", sdata->name);
174 return;
177 skb_reserve(skb, local->hw.extra_tx_headroom);
178 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
179 memset(mgmt, 0, 24);
180 memcpy(mgmt->da, da, ETH_ALEN);
181 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
182 if (sdata->vif.type == NL80211_IFTYPE_AP ||
183 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
184 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
185 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
186 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
188 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
189 IEEE80211_STYPE_ACTION);
191 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
192 mgmt->u.action.category = WLAN_CATEGORY_BACK;
193 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
194 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
196 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
197 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
198 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
200 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
201 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
202 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
204 ieee80211_tx_skb(sdata, skb);
207 void ieee80211_process_addba_request(struct ieee80211_local *local,
208 struct sta_info *sta,
209 struct ieee80211_mgmt *mgmt,
210 size_t len)
212 struct tid_ampdu_rx *tid_agg_rx;
213 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
214 u8 dialog_token;
215 int ret = -EOPNOTSUPP;
217 /* extract session parameters from addba request frame */
218 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
219 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
220 start_seq_num =
221 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
223 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
224 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
225 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
226 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
228 status = WLAN_STATUS_REQUEST_DECLINED;
230 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
231 #ifdef CONFIG_MAC80211_HT_DEBUG
232 printk(KERN_DEBUG "Suspend in progress. "
233 "Denying ADDBA request\n");
234 #endif
235 goto end_no_lock;
238 /* sanity check for incoming parameters:
239 * check if configuration can support the BA policy
240 * and if buffer size does not exceeds max value */
241 /* XXX: check own ht delayed BA capability?? */
242 if (((ba_policy != 1) &&
243 (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) ||
244 (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
245 status = WLAN_STATUS_INVALID_QOS_PARAM;
246 #ifdef CONFIG_MAC80211_HT_DEBUG
247 if (net_ratelimit())
248 printk(KERN_DEBUG "AddBA Req with bad params from "
249 "%pM on tid %u. policy %d, buffer size %d\n",
250 mgmt->sa, tid, ba_policy,
251 buf_size);
252 #endif /* CONFIG_MAC80211_HT_DEBUG */
253 goto end_no_lock;
255 /* determine default buffer size */
256 if (buf_size == 0)
257 buf_size = IEEE80211_MAX_AMPDU_BUF;
259 /* make sure the size doesn't exceed the maximum supported by the hw */
260 if (buf_size > local->hw.max_rx_aggregation_subframes)
261 buf_size = local->hw.max_rx_aggregation_subframes;
263 /* examine state machine */
264 mutex_lock(&sta->ampdu_mlme.mtx);
266 if (sta->ampdu_mlme.tid_rx[tid]) {
267 #ifdef CONFIG_MAC80211_HT_DEBUG
268 if (net_ratelimit())
269 printk(KERN_DEBUG "unexpected AddBA Req from "
270 "%pM on tid %u\n",
271 mgmt->sa, tid);
272 #endif /* CONFIG_MAC80211_HT_DEBUG */
274 /* delete existing Rx BA session on the same tid */
275 ___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
276 WLAN_STATUS_UNSPECIFIED_QOS,
277 false);
280 /* prepare A-MPDU MLME for Rx aggregation */
281 tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_KERNEL);
282 if (!tid_agg_rx) {
283 #ifdef CONFIG_MAC80211_HT_DEBUG
284 if (net_ratelimit())
285 printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
286 tid);
287 #endif
288 goto end;
291 spin_lock_init(&tid_agg_rx->reorder_lock);
293 /* rx timer */
294 tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired;
295 tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
296 init_timer(&tid_agg_rx->session_timer);
298 /* rx reorder timer */
299 tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired;
300 tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid];
301 init_timer(&tid_agg_rx->reorder_timer);
303 /* prepare reordering buffer */
304 tid_agg_rx->reorder_buf =
305 kcalloc(buf_size, sizeof(struct sk_buff *), GFP_KERNEL);
306 tid_agg_rx->reorder_time =
307 kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL);
308 if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) {
309 #ifdef CONFIG_MAC80211_HT_DEBUG
310 if (net_ratelimit())
311 printk(KERN_ERR "can not allocate reordering buffer "
312 "to tid %d\n", tid);
313 #endif
314 kfree(tid_agg_rx->reorder_buf);
315 kfree(tid_agg_rx->reorder_time);
316 kfree(tid_agg_rx);
317 goto end;
320 ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
321 &sta->sta, tid, &start_seq_num, 0);
322 #ifdef CONFIG_MAC80211_HT_DEBUG
323 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
324 #endif /* CONFIG_MAC80211_HT_DEBUG */
326 if (ret) {
327 kfree(tid_agg_rx->reorder_buf);
328 kfree(tid_agg_rx->reorder_time);
329 kfree(tid_agg_rx);
330 goto end;
333 /* update data */
334 tid_agg_rx->dialog_token = dialog_token;
335 tid_agg_rx->ssn = start_seq_num;
336 tid_agg_rx->head_seq_num = start_seq_num;
337 tid_agg_rx->buf_size = buf_size;
338 tid_agg_rx->timeout = timeout;
339 tid_agg_rx->stored_mpdu_num = 0;
340 status = WLAN_STATUS_SUCCESS;
342 /* activate it for RX */
343 rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx);
345 if (timeout)
346 mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout));
348 end:
349 mutex_unlock(&sta->ampdu_mlme.mtx);
351 end_no_lock:
352 ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
353 dialog_token, status, 1, buf_size, timeout);