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Johannes Bergb8695a82009-02-10 21:25:46 +01001/*
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"
19
Johannes Berg849b7962009-02-10 21:25:54 +010020void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
21 u16 initiator, u16 reason)
Johannes Bergb8695a82009-02-10 21:25:46 +010022{
Johannes Bergd75636e2009-02-10 21:25:53 +010023 struct ieee80211_local *local = sta->local;
Johannes Bergb8695a82009-02-10 21:25:46 +010024 struct ieee80211_hw *hw = &local->hw;
Johannes Bergd75636e2009-02-10 21:25:53 +010025 int i;
Johannes Bergb8695a82009-02-10 21:25:46 +010026
27 /* check if TID is in operational state */
28 spin_lock_bh(&sta->lock);
Johannes Bergd75636e2009-02-10 21:25:53 +010029 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) {
Johannes Bergb8695a82009-02-10 21:25:46 +010030 spin_unlock_bh(&sta->lock);
Johannes Bergb8695a82009-02-10 21:25:46 +010031 return;
32 }
Johannes Bergd75636e2009-02-10 21:25:53 +010033
Johannes Bergb8695a82009-02-10 21:25:46 +010034 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
Johannes Bergb8695a82009-02-10 21:25:46 +010039#ifdef CONFIG_MAC80211_HT_DEBUG
40 printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
Johannes Bergd75636e2009-02-10 21:25:53 +010041 sta->sta.addr, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +010042#endif /* CONFIG_MAC80211_HT_DEBUG */
43
Johannes Bergd75636e2009-02-10 21:25:53 +010044 if (local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
45 &sta->sta, tid, NULL))
Johannes Bergb8695a82009-02-10 21:25:46 +010046 printk(KERN_DEBUG "HW problem - can not stop rx "
47 "aggregation for tid %d\n", tid);
48
49 /* shutdown timer has not expired */
50 if (initiator != WLAN_BACK_TIMER)
51 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
52
53 /* check if this is a self generated aggregation halt */
54 if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
Johannes Bergd75636e2009-02-10 21:25:53 +010055 ieee80211_send_delba(sta->sdata, sta->sta.addr,
56 tid, 0, reason);
Johannes Bergb8695a82009-02-10 21:25:46 +010057
58 /* free the reordering buffer */
59 for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
60 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
61 /* release the reordered frames */
62 dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
63 sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
64 sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
65 }
66 }
Johannes Berg55687e32009-02-10 21:25:51 +010067
68 spin_lock_bh(&sta->lock);
Johannes Bergb8695a82009-02-10 21:25:46 +010069 /* free resources */
70 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
Johannes Berg55687e32009-02-10 21:25:51 +010071
72 if (!sta->ampdu_mlme.tid_rx[tid]->shutdown) {
73 kfree(sta->ampdu_mlme.tid_rx[tid]);
74 sta->ampdu_mlme.tid_rx[tid] = NULL;
75 }
76
Johannes Bergb8695a82009-02-10 21:25:46 +010077 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
Johannes Berg55687e32009-02-10 21:25:51 +010078 spin_unlock_bh(&sta->lock);
Johannes Bergd75636e2009-02-10 21:25:53 +010079}
80
81void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
82 u16 initiator, u16 reason)
83{
84 struct ieee80211_local *local = sdata->local;
85 struct sta_info *sta;
86
87 /* stop HW Rx aggregation. ampdu_action existence
88 * already verified in session init so we add the BUG_ON */
89 BUG_ON(!local->ops->ampdu_action);
90
91 rcu_read_lock();
92
93 sta = sta_info_get(local, ra);
94 if (!sta) {
95 rcu_read_unlock();
96 return;
97 }
98
Johannes Berg849b7962009-02-10 21:25:54 +010099 __ieee80211_stop_rx_ba_session(sta, tid, initiator, reason);
Johannes Bergb8695a82009-02-10 21:25:46 +0100100
101 rcu_read_unlock();
102}
103
104/*
105 * After accepting the AddBA Request we activated a timer,
106 * resetting it after each frame that arrives from the originator.
107 * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
108 */
109static void sta_rx_agg_session_timer_expired(unsigned long data)
110{
111 /* not an elegant detour, but there is no choice as the timer passes
112 * only one argument, and various sta_info are needed here, so init
113 * flow in sta_info_create gives the TID as data, while the timer_to_id
114 * array gives the sta through container_of */
115 u8 *ptid = (u8 *)data;
116 u8 *timer_to_id = ptid - *ptid;
117 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
118 timer_to_tid[0]);
119
120#ifdef CONFIG_MAC80211_HT_DEBUG
121 printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
122#endif
123 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
124 (u16)*ptid, WLAN_BACK_TIMER,
125 WLAN_REASON_QSTA_TIMEOUT);
126}
127
128static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
129 u8 dialog_token, u16 status, u16 policy,
130 u16 buf_size, u16 timeout)
131{
Johannes Bergb8695a82009-02-10 21:25:46 +0100132 struct ieee80211_local *local = sdata->local;
133 struct sk_buff *skb;
134 struct ieee80211_mgmt *mgmt;
135 u16 capab;
136
137 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
138
139 if (!skb) {
140 printk(KERN_DEBUG "%s: failed to allocate buffer "
141 "for addba resp frame\n", sdata->dev->name);
142 return;
143 }
144
145 skb_reserve(skb, local->hw.extra_tx_headroom);
146 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
147 memset(mgmt, 0, 24);
148 memcpy(mgmt->da, da, ETH_ALEN);
149 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
Johannes Berg8abd3f92009-02-10 21:25:47 +0100150 if (sdata->vif.type == NL80211_IFTYPE_AP ||
151 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
Johannes Bergb8695a82009-02-10 21:25:46 +0100152 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +0100153 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
154 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
155
Johannes Bergb8695a82009-02-10 21:25:46 +0100156 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
157 IEEE80211_STYPE_ACTION);
158
159 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
160 mgmt->u.action.category = WLAN_CATEGORY_BACK;
161 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
162 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
163
164 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
165 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
166 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
167
168 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
169 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
170 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
171
172 ieee80211_tx_skb(sdata, skb, 1);
173}
174
175void ieee80211_process_addba_request(struct ieee80211_local *local,
176 struct sta_info *sta,
177 struct ieee80211_mgmt *mgmt,
178 size_t len)
179{
180 struct ieee80211_hw *hw = &local->hw;
181 struct ieee80211_conf *conf = &hw->conf;
182 struct tid_ampdu_rx *tid_agg_rx;
183 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
184 u8 dialog_token;
185 int ret = -EOPNOTSUPP;
186
187 /* extract session parameters from addba request frame */
188 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
189 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
190 start_seq_num =
191 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
192
193 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
194 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
195 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
196 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
197
198 status = WLAN_STATUS_REQUEST_DECLINED;
199
Sujith722f0692009-03-17 08:50:06 +0530200 if (test_sta_flags(sta, WLAN_STA_SUSPEND)) {
201#ifdef CONFIG_MAC80211_HT_DEBUG
202 printk(KERN_DEBUG "Suspend in progress. "
203 "Denying ADDBA request\n");
204#endif
205 goto end_no_lock;
206 }
207
Johannes Bergb8695a82009-02-10 21:25:46 +0100208 /* sanity check for incoming parameters:
209 * check if configuration can support the BA policy
210 * and if buffer size does not exceeds max value */
211 /* XXX: check own ht delayed BA capability?? */
212 if (((ba_policy != 1)
213 && (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA)))
214 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
215 status = WLAN_STATUS_INVALID_QOS_PARAM;
216#ifdef CONFIG_MAC80211_HT_DEBUG
217 if (net_ratelimit())
218 printk(KERN_DEBUG "AddBA Req with bad params from "
219 "%pM on tid %u. policy %d, buffer size %d\n",
220 mgmt->sa, tid, ba_policy,
221 buf_size);
222#endif /* CONFIG_MAC80211_HT_DEBUG */
223 goto end_no_lock;
224 }
225 /* determine default buffer size */
226 if (buf_size == 0) {
227 struct ieee80211_supported_band *sband;
228
229 sband = local->hw.wiphy->bands[conf->channel->band];
230 buf_size = IEEE80211_MIN_AMPDU_BUF;
231 buf_size = buf_size << sband->ht_cap.ampdu_factor;
232 }
233
234
235 /* examine state machine */
236 spin_lock_bh(&sta->lock);
237
238 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
239#ifdef CONFIG_MAC80211_HT_DEBUG
240 if (net_ratelimit())
241 printk(KERN_DEBUG "unexpected AddBA Req from "
242 "%pM on tid %u\n",
243 mgmt->sa, tid);
244#endif /* CONFIG_MAC80211_HT_DEBUG */
245 goto end;
246 }
247
248 /* prepare A-MPDU MLME for Rx aggregation */
249 sta->ampdu_mlme.tid_rx[tid] =
250 kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
251 if (!sta->ampdu_mlme.tid_rx[tid]) {
252#ifdef CONFIG_MAC80211_HT_DEBUG
253 if (net_ratelimit())
254 printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
255 tid);
256#endif
257 goto end;
258 }
259 /* rx timer */
260 sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
261 sta_rx_agg_session_timer_expired;
262 sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
263 (unsigned long)&sta->timer_to_tid[tid];
264 init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
265
266 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
267
268 /* prepare reordering buffer */
269 tid_agg_rx->reorder_buf =
270 kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
271 if (!tid_agg_rx->reorder_buf) {
272#ifdef CONFIG_MAC80211_HT_DEBUG
273 if (net_ratelimit())
274 printk(KERN_ERR "can not allocate reordering buffer "
275 "to tid %d\n", tid);
276#endif
277 kfree(sta->ampdu_mlme.tid_rx[tid]);
278 goto end;
279 }
280
281 if (local->ops->ampdu_action)
282 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
283 &sta->sta, tid, &start_seq_num);
284#ifdef CONFIG_MAC80211_HT_DEBUG
285 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
286#endif /* CONFIG_MAC80211_HT_DEBUG */
287
288 if (ret) {
289 kfree(tid_agg_rx->reorder_buf);
290 kfree(tid_agg_rx);
291 sta->ampdu_mlme.tid_rx[tid] = NULL;
292 goto end;
293 }
294
295 /* change state and send addba resp */
296 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
297 tid_agg_rx->dialog_token = dialog_token;
298 tid_agg_rx->ssn = start_seq_num;
299 tid_agg_rx->head_seq_num = start_seq_num;
300 tid_agg_rx->buf_size = buf_size;
301 tid_agg_rx->timeout = timeout;
302 tid_agg_rx->stored_mpdu_num = 0;
303 status = WLAN_STATUS_SUCCESS;
304end:
305 spin_unlock_bh(&sta->lock);
306
307end_no_lock:
308 ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
309 dialog_token, status, 1, buf_size, timeout);
310}