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 #include "rate.h"
20
21 void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
22 struct ieee80211_ht_cap *ht_cap_ie,
23 struct ieee80211_sta_ht_cap *ht_cap)
24 {
25 u8 ampdu_info, tx_mcs_set_cap;
26 int i, max_tx_streams;
27
28 BUG_ON(!ht_cap);
29
30 memset(ht_cap, 0, sizeof(*ht_cap));
31
32 if (!ht_cap_ie)
33 return;
34
35 ht_cap->ht_supported = true;
36
37 ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & sband->ht_cap.cap;
38 ht_cap->cap &= ~IEEE80211_HT_CAP_SM_PS;
39 ht_cap->cap |= sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS;
40
41 ampdu_info = ht_cap_ie->ampdu_params_info;
42 ht_cap->ampdu_factor =
43 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
44 ht_cap->ampdu_density =
45 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
46
47 /* own MCS TX capabilities */
48 tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
49
50 /* can we TX with MCS rates? */
51 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
52 return;
53
54 /* Counting from 0, therefore +1 */
55 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
56 max_tx_streams =
57 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
58 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
59 else
60 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
61
62 /*
63 * 802.11n D5.0 20.3.5 / 20.6 says:
64 * - indices 0 to 7 and 32 are single spatial stream
65 * - 8 to 31 are multiple spatial streams using equal modulation
66 * [8..15 for two streams, 16..23 for three and 24..31 for four]
67 * - remainder are multiple spatial streams using unequal modulation
68 */
69 for (i = 0; i < max_tx_streams; i++)
70 ht_cap->mcs.rx_mask[i] =
71 sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
72
73 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
74 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
75 i < IEEE80211_HT_MCS_MASK_LEN; i++)
76 ht_cap->mcs.rx_mask[i] =
77 sband->ht_cap.mcs.rx_mask[i] &
78 ht_cap_ie->mcs.rx_mask[i];
79
80 /* handle MCS rate 32 too */
81 if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
82 ht_cap->mcs.rx_mask[32/8] |= 1;
83 }
84
85 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta)
86 {
87 int i;
88
89 for (i = 0; i < STA_TID_NUM; i++) {
90 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR);
91 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
92 WLAN_REASON_QSTA_LEAVE_QBSS);
93 }
94 }
95
96 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
97 const u8 *da, u16 tid,
98 u16 initiator, u16 reason_code)
99 {
100 struct ieee80211_local *local = sdata->local;
101 struct sk_buff *skb;
102 struct ieee80211_mgmt *mgmt;
103 u16 params;
104
105 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
106
107 if (!skb) {
108 printk(KERN_ERR "%s: failed to allocate buffer "
109 "for delba frame\n", sdata->dev->name);
110 return;
111 }
112
113 skb_reserve(skb, local->hw.extra_tx_headroom);
114 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
115 memset(mgmt, 0, 24);
116 memcpy(mgmt->da, da, ETH_ALEN);
117 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
118 if (sdata->vif.type == NL80211_IFTYPE_AP ||
119 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
120 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
121 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
122 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
123
124 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
125 IEEE80211_STYPE_ACTION);
126
127 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
128
129 mgmt->u.action.category = WLAN_CATEGORY_BACK;
130 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
131 params = (u16)(initiator << 11); /* bit 11 initiator */
132 params |= (u16)(tid << 12); /* bit 15:12 TID number */
133
134 mgmt->u.action.u.delba.params = cpu_to_le16(params);
135 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
136
137 ieee80211_tx_skb(sdata, skb, 1);
138 }
139
140 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
141 struct sta_info *sta,
142 struct ieee80211_mgmt *mgmt, size_t len)
143 {
144 u16 tid, params;
145 u16 initiator;
146
147 params = le16_to_cpu(mgmt->u.action.u.delba.params);
148 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
149 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
150
151 #ifdef CONFIG_MAC80211_HT_DEBUG
152 if (net_ratelimit())
153 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
154 mgmt->sa, initiator ? "initiator" : "recipient", tid,
155 mgmt->u.action.u.delba.reason_code);
156 #endif /* CONFIG_MAC80211_HT_DEBUG */
157
158 if (initiator == WLAN_BACK_INITIATOR)
159 ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid,
160 WLAN_BACK_INITIATOR, 0);
161 else { /* WLAN_BACK_RECIPIENT */
162 spin_lock_bh(&sta->lock);
163 if (sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK)
164 ___ieee80211_stop_tx_ba_session(sta, tid,
165 WLAN_BACK_RECIPIENT);
166 spin_unlock_bh(&sta->lock);
167 }
168 }
169
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