Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[linux-2.6] / net / mac80211 / spectmgmt.c
1 /*
2  * spectrum management
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  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU General Public License version 2 as
14  * published by the Free Software Foundation.
15  */
16
17 #include <linux/ieee80211.h>
18 #include <net/wireless.h>
19 #include <net/mac80211.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "wme.h"
23
24 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
25                                         struct ieee80211_msrment_ie *request_ie,
26                                         const u8 *da, const u8 *bssid,
27                                         u8 dialog_token)
28 {
29         struct ieee80211_local *local = sdata->local;
30         struct sk_buff *skb;
31         struct ieee80211_mgmt *msr_report;
32
33         skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
34                                 sizeof(struct ieee80211_msrment_ie));
35
36         if (!skb) {
37                 printk(KERN_ERR "%s: failed to allocate buffer for "
38                                 "measurement report frame\n", sdata->dev->name);
39                 return;
40         }
41
42         skb_reserve(skb, local->hw.extra_tx_headroom);
43         msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
44         memset(msr_report, 0, 24);
45         memcpy(msr_report->da, da, ETH_ALEN);
46         memcpy(msr_report->sa, sdata->dev->dev_addr, ETH_ALEN);
47         memcpy(msr_report->bssid, bssid, ETH_ALEN);
48         msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
49                                                 IEEE80211_STYPE_ACTION);
50
51         skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
52         msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
53         msr_report->u.action.u.measurement.action_code =
54                                 WLAN_ACTION_SPCT_MSR_RPRT;
55         msr_report->u.action.u.measurement.dialog_token = dialog_token;
56
57         msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
58         msr_report->u.action.u.measurement.length =
59                         sizeof(struct ieee80211_msrment_ie);
60
61         memset(&msr_report->u.action.u.measurement.msr_elem, 0,
62                 sizeof(struct ieee80211_msrment_ie));
63         msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
64         msr_report->u.action.u.measurement.msr_elem.mode |=
65                         IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
66         msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
67
68         ieee80211_tx_skb(sdata, skb, 1);
69 }
70
71 void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
72                                        struct ieee80211_mgmt *mgmt,
73                                        size_t len)
74 {
75         /*
76          * Ignoring measurement request is spec violation.
77          * Mandatory measurements must be reported optional
78          * measurements might be refused or reported incapable
79          * For now just refuse
80          * TODO: Answer basic measurement as unmeasured
81          */
82         ieee80211_send_refuse_measurement_request(sdata,
83                         &mgmt->u.action.u.measurement.msr_elem,
84                         mgmt->sa, mgmt->bssid,
85                         mgmt->u.action.u.measurement.dialog_token);
86 }
87
88 void ieee80211_chswitch_work(struct work_struct *work)
89 {
90         struct ieee80211_sub_if_data *sdata =
91                 container_of(work, struct ieee80211_sub_if_data, u.sta.chswitch_work);
92         struct ieee80211_bss *bss;
93         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
94
95         if (!netif_running(sdata->dev))
96                 return;
97
98         bss = ieee80211_rx_bss_get(sdata->local, ifsta->bssid,
99                                    sdata->local->hw.conf.channel->center_freq,
100                                    ifsta->ssid, ifsta->ssid_len);
101         if (!bss)
102                 goto exit;
103
104         sdata->local->oper_channel = sdata->local->csa_channel;
105         /* XXX: shouldn't really modify cfg80211-owned data! */
106         if (!ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL))
107                 bss->cbss.channel = sdata->local->oper_channel;
108
109         ieee80211_rx_bss_put(sdata->local, bss);
110 exit:
111         ifsta->flags &= ~IEEE80211_STA_CSA_RECEIVED;
112         ieee80211_wake_queues_by_reason(&sdata->local->hw,
113                                         IEEE80211_QUEUE_STOP_REASON_CSA);
114 }
115
116 void ieee80211_chswitch_timer(unsigned long data)
117 {
118         struct ieee80211_sub_if_data *sdata =
119                 (struct ieee80211_sub_if_data *) data;
120         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
121
122         queue_work(sdata->local->hw.workqueue, &ifsta->chswitch_work);
123 }
124
125 void ieee80211_process_chanswitch(struct ieee80211_sub_if_data *sdata,
126                                   struct ieee80211_channel_sw_ie *sw_elem,
127                                   struct ieee80211_bss *bss)
128 {
129         struct ieee80211_channel *new_ch;
130         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
131         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
132
133         /* FIXME: Handle ADHOC later */
134         if (sdata->vif.type != NL80211_IFTYPE_STATION)
135                 return;
136
137         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATED)
138                 return;
139
140         if (sdata->local->sw_scanning || sdata->local->hw_scanning)
141                 return;
142
143         /* Disregard subsequent beacons if we are already running a timer
144            processing a CSA */
145
146         if (ifsta->flags & IEEE80211_STA_CSA_RECEIVED)
147                 return;
148
149         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
150         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
151                 return;
152
153         sdata->local->csa_channel = new_ch;
154
155         if (sw_elem->count <= 1) {
156                 queue_work(sdata->local->hw.workqueue, &ifsta->chswitch_work);
157         } else {
158                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
159                                                 IEEE80211_QUEUE_STOP_REASON_CSA);
160                 ifsta->flags |= IEEE80211_STA_CSA_RECEIVED;
161                 mod_timer(&ifsta->chswitch_timer,
162                           jiffies +
163                           msecs_to_jiffies(sw_elem->count *
164                                            bss->cbss.beacon_interval));
165         }
166 }
167
168 void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
169                                  u16 capab_info, u8 *pwr_constr_elem,
170                                  u8 pwr_constr_elem_len)
171 {
172         struct ieee80211_conf *conf = &sdata->local->hw.conf;
173
174         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
175                 return;
176
177         /* Power constraint IE length should be 1 octet */
178         if (pwr_constr_elem_len != 1)
179                 return;
180
181         if ((*pwr_constr_elem <= conf->channel->max_power) &&
182             (*pwr_constr_elem != sdata->local->power_constr_level)) {
183                 sdata->local->power_constr_level = *pwr_constr_elem;
184                 ieee80211_hw_config(sdata->local, 0);
185         }
186 }
187