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-rw-r--r--net/mac80211/agg-rx.c302
1 files changed, 302 insertions, 0 deletions
diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c
new file mode 100644
index 000000000000..3112bfd441b6
--- /dev/null
+++ b/net/mac80211/agg-rx.c
@@ -0,0 +1,302 @@
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"
19
20void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
21 u16 initiator, u16 reason)
22{
23 struct ieee80211_local *local = sta->local;
24 struct ieee80211_hw *hw = &local->hw;
25 int i;
26
27 /* check if TID is in operational state */
28 spin_lock_bh(&sta->lock);
29 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) {
30 spin_unlock_bh(&sta->lock);
31 return;
32 }
33
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
39#ifdef CONFIG_MAC80211_HT_DEBUG
40 printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
41 sta->sta.addr, tid);
42#endif /* CONFIG_MAC80211_HT_DEBUG */
43
44 if (local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
45 &sta->sta, tid, NULL))
46 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)
55 ieee80211_send_delba(sta->sdata, sta->sta.addr,
56 tid, 0, reason);
57
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 }
67
68 spin_lock_bh(&sta->lock);
69 /* free resources */
70 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
71
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
77 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
78 spin_unlock_bh(&sta->lock);
79}
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
99 __ieee80211_stop_rx_ba_session(sta, tid, initiator, reason);
100
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{
132 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
133 struct ieee80211_local *local = sdata->local;
134 struct sk_buff *skb;
135 struct ieee80211_mgmt *mgmt;
136 u16 capab;
137
138 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
139
140 if (!skb) {
141 printk(KERN_DEBUG "%s: failed to allocate buffer "
142 "for addba resp frame\n", sdata->dev->name);
143 return;
144 }
145
146 skb_reserve(skb, local->hw.extra_tx_headroom);
147 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
148 memset(mgmt, 0, 24);
149 memcpy(mgmt->da, da, ETH_ALEN);
150 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
151 if (sdata->vif.type == NL80211_IFTYPE_AP ||
152 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
153 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
154 else
155 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
156 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
200 /* sanity check for incoming parameters:
201 * check if configuration can support the BA policy
202 * and if buffer size does not exceeds max value */
203 /* XXX: check own ht delayed BA capability?? */
204 if (((ba_policy != 1)
205 && (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA)))
206 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
207 status = WLAN_STATUS_INVALID_QOS_PARAM;
208#ifdef CONFIG_MAC80211_HT_DEBUG
209 if (net_ratelimit())
210 printk(KERN_DEBUG "AddBA Req with bad params from "
211 "%pM on tid %u. policy %d, buffer size %d\n",
212 mgmt->sa, tid, ba_policy,
213 buf_size);
214#endif /* CONFIG_MAC80211_HT_DEBUG */
215 goto end_no_lock;
216 }
217 /* determine default buffer size */
218 if (buf_size == 0) {
219 struct ieee80211_supported_band *sband;
220
221 sband = local->hw.wiphy->bands[conf->channel->band];
222 buf_size = IEEE80211_MIN_AMPDU_BUF;
223 buf_size = buf_size << sband->ht_cap.ampdu_factor;
224 }
225
226
227 /* examine state machine */
228 spin_lock_bh(&sta->lock);
229
230 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
231#ifdef CONFIG_MAC80211_HT_DEBUG
232 if (net_ratelimit())
233 printk(KERN_DEBUG "unexpected AddBA Req from "
234 "%pM on tid %u\n",
235 mgmt->sa, tid);
236#endif /* CONFIG_MAC80211_HT_DEBUG */
237 goto end;
238 }
239
240 /* prepare A-MPDU MLME for Rx aggregation */
241 sta->ampdu_mlme.tid_rx[tid] =
242 kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
243 if (!sta->ampdu_mlme.tid_rx[tid]) {
244#ifdef CONFIG_MAC80211_HT_DEBUG
245 if (net_ratelimit())
246 printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
247 tid);
248#endif
249 goto end;
250 }
251 /* rx timer */
252 sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
253 sta_rx_agg_session_timer_expired;
254 sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
255 (unsigned long)&sta->timer_to_tid[tid];
256 init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
257
258 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
259
260 /* prepare reordering buffer */
261 tid_agg_rx->reorder_buf =
262 kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
263 if (!tid_agg_rx->reorder_buf) {
264#ifdef CONFIG_MAC80211_HT_DEBUG
265 if (net_ratelimit())
266 printk(KERN_ERR "can not allocate reordering buffer "
267 "to tid %d\n", tid);
268#endif
269 kfree(sta->ampdu_mlme.tid_rx[tid]);
270 goto end;
271 }
272
273 if (local->ops->ampdu_action)
274 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
275 &sta->sta, tid, &start_seq_num);
276#ifdef CONFIG_MAC80211_HT_DEBUG
277 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
278#endif /* CONFIG_MAC80211_HT_DEBUG */
279
280 if (ret) {
281 kfree(tid_agg_rx->reorder_buf);
282 kfree(tid_agg_rx);
283 sta->ampdu_mlme.tid_rx[tid] = NULL;
284 goto end;
285 }
286
287 /* change state and send addba resp */
288 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
289 tid_agg_rx->dialog_token = dialog_token;
290 tid_agg_rx->ssn = start_seq_num;
291 tid_agg_rx->head_seq_num = start_seq_num;
292 tid_agg_rx->buf_size = buf_size;
293 tid_agg_rx->timeout = timeout;
294 tid_agg_rx->stored_mpdu_num = 0;
295 status = WLAN_STATUS_SUCCESS;
296end:
297 spin_unlock_bh(&sta->lock);
298
299end_no_lock:
300 ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
301 dialog_token, status, 1, buf_size, timeout);
302}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-27 00:33:31 -0500