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1/******************************************************************************
2 *
3 * This file is provided under a dual BSD/GPLv2 license.  When using or
4 * redistributing this file, you may do so under either license.
5 *
6 * GPL LICENSE SUMMARY
7 *
8 * Copyright(c) 2014 Intel Mobile Communications GmbH
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of version 2 of the GNU General Public License as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
22 * USA
23 *
24 * The full GNU General Public License is included in this distribution
25 * in the file called COPYING.
26 *
27 * Contact Information:
28 *  Intel Linux Wireless <ilw@linux.intel.com>
29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
30 *
31 * BSD LICENSE
32 *
33 * Copyright(c) 2014 Intel Mobile Communications GmbH
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 *
40 *  * Redistributions of source code must retain the above copyright
41 *    notice, this list of conditions and the following disclaimer.
42 *  * Redistributions in binary form must reproduce the above copyright
43 *    notice, this list of conditions and the following disclaimer in
44 *    the documentation and/or other materials provided with the
45 *    distribution.
46 *  * Neither the name Intel Corporation nor the names of its
47 *    contributors may be used to endorse or promote products derived
48 *    from this software without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
54 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 *
62 *****************************************************************************/
63
64#include "mvm.h"
65#include "time-event.h"
66
67void iwl_mvm_teardown_tdls_peers(struct iwl_mvm *mvm)
68{
69	struct ieee80211_sta *sta;
70	struct iwl_mvm_sta *mvmsta;
71	int i;
72
73	lockdep_assert_held(&mvm->mutex);
74
75	for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
76		sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
77						lockdep_is_held(&mvm->mutex));
78		if (!sta || IS_ERR(sta) || !sta->tdls)
79			continue;
80
81		mvmsta = iwl_mvm_sta_from_mac80211(sta);
82		ieee80211_tdls_oper_request(mvmsta->vif, sta->addr,
83				NL80211_TDLS_TEARDOWN,
84				WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED,
85				GFP_KERNEL);
86	}
87}
88
89int iwl_mvm_tdls_sta_count(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
90{
91	struct ieee80211_sta *sta;
92	struct iwl_mvm_sta *mvmsta;
93	int count = 0;
94	int i;
95
96	lockdep_assert_held(&mvm->mutex);
97
98	for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
99		sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
100						lockdep_is_held(&mvm->mutex));
101		if (!sta || IS_ERR(sta) || !sta->tdls)
102			continue;
103
104		if (vif) {
105			mvmsta = iwl_mvm_sta_from_mac80211(sta);
106			if (mvmsta->vif != vif)
107				continue;
108		}
109
110		count++;
111	}
112
113	return count;
114}
115
116void iwl_mvm_recalc_tdls_state(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
117			       bool sta_added)
118{
119	int tdls_sta_cnt = iwl_mvm_tdls_sta_count(mvm, vif);
120
121	/*
122	 * Disable ps when the first TDLS sta is added and re-enable it
123	 * when the last TDLS sta is removed
124	 */
125	if ((tdls_sta_cnt == 1 && sta_added) ||
126	    (tdls_sta_cnt == 0 && !sta_added))
127		iwl_mvm_power_update_mac(mvm);
128}
129
130void iwl_mvm_mac_mgd_protect_tdls_discover(struct ieee80211_hw *hw,
131					   struct ieee80211_vif *vif)
132{
133	struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
134	u32 duration = 2 * vif->bss_conf.dtim_period * vif->bss_conf.beacon_int;
135
136	/*
137	 * iwl_mvm_protect_session() reads directly from the device
138	 * (the system time), so make sure it is available.
139	 */
140	if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_PROTECT_TDLS))
141		return;
142
143	mutex_lock(&mvm->mutex);
144	/* Protect the session to hear the TDLS setup response on the channel */
145	iwl_mvm_protect_session(mvm, vif, duration, duration, 100, true);
146	mutex_unlock(&mvm->mutex);
147
148	iwl_mvm_unref(mvm, IWL_MVM_REF_PROTECT_TDLS);
149}
150