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b8695a8f JB |
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 | ||
20 | void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, | |
21 | u16 initiator, u16 reason) | |
22 | { | |
23 | struct ieee80211_local *local = sdata->local; | |
24 | struct ieee80211_hw *hw = &local->hw; | |
25 | struct sta_info *sta; | |
26 | int ret, i; | |
27 | ||
28 | rcu_read_lock(); | |
29 | ||
30 | sta = sta_info_get(local, ra); | |
31 | if (!sta) { | |
32 | rcu_read_unlock(); | |
33 | return; | |
34 | } | |
35 | ||
36 | /* check if TID is in operational state */ | |
37 | spin_lock_bh(&sta->lock); | |
38 | if (sta->ampdu_mlme.tid_state_rx[tid] | |
39 | != HT_AGG_STATE_OPERATIONAL) { | |
40 | spin_unlock_bh(&sta->lock); | |
41 | rcu_read_unlock(); | |
42 | return; | |
43 | } | |
44 | sta->ampdu_mlme.tid_state_rx[tid] = | |
45 | HT_AGG_STATE_REQ_STOP_BA_MSK | | |
46 | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); | |
47 | spin_unlock_bh(&sta->lock); | |
48 | ||
49 | /* stop HW Rx aggregation. ampdu_action existence | |
50 | * already verified in session init so we add the BUG_ON */ | |
51 | BUG_ON(!local->ops->ampdu_action); | |
52 | ||
53 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
54 | printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n", | |
55 | ra, tid); | |
56 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
57 | ||
58 | ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP, | |
59 | &sta->sta, tid, NULL); | |
60 | if (ret) | |
61 | printk(KERN_DEBUG "HW problem - can not stop rx " | |
62 | "aggregation for tid %d\n", tid); | |
63 | ||
64 | /* shutdown timer has not expired */ | |
65 | if (initiator != WLAN_BACK_TIMER) | |
66 | del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer); | |
67 | ||
68 | /* check if this is a self generated aggregation halt */ | |
69 | if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER) | |
70 | ieee80211_send_delba(sdata, ra, tid, 0, reason); | |
71 | ||
72 | /* free the reordering buffer */ | |
73 | for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) { | |
74 | if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) { | |
75 | /* release the reordered frames */ | |
76 | dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]); | |
77 | sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--; | |
78 | sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL; | |
79 | } | |
80 | } | |
81 | /* free resources */ | |
82 | kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf); | |
83 | kfree(sta->ampdu_mlme.tid_rx[tid]); | |
84 | sta->ampdu_mlme.tid_rx[tid] = NULL; | |
85 | sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE; | |
86 | ||
87 | rcu_read_unlock(); | |
88 | } | |
89 | ||
90 | /* | |
91 | * After accepting the AddBA Request we activated a timer, | |
92 | * resetting it after each frame that arrives from the originator. | |
93 | * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed. | |
94 | */ | |
95 | static void sta_rx_agg_session_timer_expired(unsigned long data) | |
96 | { | |
97 | /* not an elegant detour, but there is no choice as the timer passes | |
98 | * only one argument, and various sta_info are needed here, so init | |
99 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
100 | * array gives the sta through container_of */ | |
101 | u8 *ptid = (u8 *)data; | |
102 | u8 *timer_to_id = ptid - *ptid; | |
103 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, | |
104 | timer_to_tid[0]); | |
105 | ||
106 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
107 | printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid); | |
108 | #endif | |
109 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, | |
110 | (u16)*ptid, WLAN_BACK_TIMER, | |
111 | WLAN_REASON_QSTA_TIMEOUT); | |
112 | } | |
113 | ||
114 | static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid, | |
115 | u8 dialog_token, u16 status, u16 policy, | |
116 | u16 buf_size, u16 timeout) | |
117 | { | |
118 | struct ieee80211_if_sta *ifsta = &sdata->u.sta; | |
119 | struct ieee80211_local *local = sdata->local; | |
120 | struct sk_buff *skb; | |
121 | struct ieee80211_mgmt *mgmt; | |
122 | u16 capab; | |
123 | ||
124 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
125 | ||
126 | if (!skb) { | |
127 | printk(KERN_DEBUG "%s: failed to allocate buffer " | |
128 | "for addba resp frame\n", sdata->dev->name); | |
129 | return; | |
130 | } | |
131 | ||
132 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
133 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
134 | memset(mgmt, 0, 24); | |
135 | memcpy(mgmt->da, da, ETH_ALEN); | |
136 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
137 | if (sdata->vif.type == NL80211_IFTYPE_AP) | |
138 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); | |
139 | else | |
140 | memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); | |
141 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
142 | IEEE80211_STYPE_ACTION); | |
143 | ||
144 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); | |
145 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
146 | mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; | |
147 | mgmt->u.action.u.addba_resp.dialog_token = dialog_token; | |
148 | ||
149 | capab = (u16)(policy << 1); /* bit 1 aggregation policy */ | |
150 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
151 | capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */ | |
152 | ||
153 | mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); | |
154 | mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); | |
155 | mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); | |
156 | ||
157 | ieee80211_tx_skb(sdata, skb, 1); | |
158 | } | |
159 | ||
160 | void ieee80211_process_addba_request(struct ieee80211_local *local, | |
161 | struct sta_info *sta, | |
162 | struct ieee80211_mgmt *mgmt, | |
163 | size_t len) | |
164 | { | |
165 | struct ieee80211_hw *hw = &local->hw; | |
166 | struct ieee80211_conf *conf = &hw->conf; | |
167 | struct tid_ampdu_rx *tid_agg_rx; | |
168 | u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status; | |
169 | u8 dialog_token; | |
170 | int ret = -EOPNOTSUPP; | |
171 | ||
172 | /* extract session parameters from addba request frame */ | |
173 | dialog_token = mgmt->u.action.u.addba_req.dialog_token; | |
174 | timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); | |
175 | start_seq_num = | |
176 | le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; | |
177 | ||
178 | capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); | |
179 | ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; | |
180 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
181 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; | |
182 | ||
183 | status = WLAN_STATUS_REQUEST_DECLINED; | |
184 | ||
185 | /* sanity check for incoming parameters: | |
186 | * check if configuration can support the BA policy | |
187 | * and if buffer size does not exceeds max value */ | |
188 | /* XXX: check own ht delayed BA capability?? */ | |
189 | if (((ba_policy != 1) | |
190 | && (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) | |
191 | || (buf_size > IEEE80211_MAX_AMPDU_BUF)) { | |
192 | status = WLAN_STATUS_INVALID_QOS_PARAM; | |
193 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
194 | if (net_ratelimit()) | |
195 | printk(KERN_DEBUG "AddBA Req with bad params from " | |
196 | "%pM on tid %u. policy %d, buffer size %d\n", | |
197 | mgmt->sa, tid, ba_policy, | |
198 | buf_size); | |
199 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
200 | goto end_no_lock; | |
201 | } | |
202 | /* determine default buffer size */ | |
203 | if (buf_size == 0) { | |
204 | struct ieee80211_supported_band *sband; | |
205 | ||
206 | sband = local->hw.wiphy->bands[conf->channel->band]; | |
207 | buf_size = IEEE80211_MIN_AMPDU_BUF; | |
208 | buf_size = buf_size << sband->ht_cap.ampdu_factor; | |
209 | } | |
210 | ||
211 | ||
212 | /* examine state machine */ | |
213 | spin_lock_bh(&sta->lock); | |
214 | ||
215 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) { | |
216 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
217 | if (net_ratelimit()) | |
218 | printk(KERN_DEBUG "unexpected AddBA Req from " | |
219 | "%pM on tid %u\n", | |
220 | mgmt->sa, tid); | |
221 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
222 | goto end; | |
223 | } | |
224 | ||
225 | /* prepare A-MPDU MLME for Rx aggregation */ | |
226 | sta->ampdu_mlme.tid_rx[tid] = | |
227 | kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC); | |
228 | if (!sta->ampdu_mlme.tid_rx[tid]) { | |
229 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
230 | if (net_ratelimit()) | |
231 | printk(KERN_ERR "allocate rx mlme to tid %d failed\n", | |
232 | tid); | |
233 | #endif | |
234 | goto end; | |
235 | } | |
236 | /* rx timer */ | |
237 | sta->ampdu_mlme.tid_rx[tid]->session_timer.function = | |
238 | sta_rx_agg_session_timer_expired; | |
239 | sta->ampdu_mlme.tid_rx[tid]->session_timer.data = | |
240 | (unsigned long)&sta->timer_to_tid[tid]; | |
241 | init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer); | |
242 | ||
243 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; | |
244 | ||
245 | /* prepare reordering buffer */ | |
246 | tid_agg_rx->reorder_buf = | |
247 | kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC); | |
248 | if (!tid_agg_rx->reorder_buf) { | |
249 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
250 | if (net_ratelimit()) | |
251 | printk(KERN_ERR "can not allocate reordering buffer " | |
252 | "to tid %d\n", tid); | |
253 | #endif | |
254 | kfree(sta->ampdu_mlme.tid_rx[tid]); | |
255 | goto end; | |
256 | } | |
257 | ||
258 | if (local->ops->ampdu_action) | |
259 | ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START, | |
260 | &sta->sta, tid, &start_seq_num); | |
261 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
262 | printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret); | |
263 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
264 | ||
265 | if (ret) { | |
266 | kfree(tid_agg_rx->reorder_buf); | |
267 | kfree(tid_agg_rx); | |
268 | sta->ampdu_mlme.tid_rx[tid] = NULL; | |
269 | goto end; | |
270 | } | |
271 | ||
272 | /* change state and send addba resp */ | |
273 | sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL; | |
274 | tid_agg_rx->dialog_token = dialog_token; | |
275 | tid_agg_rx->ssn = start_seq_num; | |
276 | tid_agg_rx->head_seq_num = start_seq_num; | |
277 | tid_agg_rx->buf_size = buf_size; | |
278 | tid_agg_rx->timeout = timeout; | |
279 | tid_agg_rx->stored_mpdu_num = 0; | |
280 | status = WLAN_STATUS_SUCCESS; | |
281 | end: | |
282 | spin_unlock_bh(&sta->lock); | |
283 | ||
284 | end_no_lock: | |
285 | ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid, | |
286 | dialog_token, status, 1, buf_size, timeout); | |
287 | } |