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>
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.
17 #include <linux/ieee80211.h>
18 #include <net/cfg80211.h>
19 #include <net/mac80211.h>
20 #include "ieee80211_i.h"
24 int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data
*sdata
,
25 struct ieee802_11_elems
*elems
,
26 enum ieee80211_band current_band
,
27 u32 sta_flags
, u8
*bssid
,
28 struct ieee80211_csa_ie
*csa_ie
)
30 enum ieee80211_band new_band
;
33 struct ieee80211_channel
*new_chan
;
34 struct cfg80211_chan_def new_vht_chandef
= {};
35 const struct ieee80211_sec_chan_offs_ie
*sec_chan_offs
;
36 const struct ieee80211_wide_bw_chansw_ie
*wide_bw_chansw_ie
;
37 const struct ieee80211_ht_operation
*ht_oper
;
38 int secondary_channel_offset
= -1;
40 sec_chan_offs
= elems
->sec_chan_offs
;
41 wide_bw_chansw_ie
= elems
->wide_bw_chansw_ie
;
42 ht_oper
= elems
->ht_operation
;
44 if (sta_flags
& (IEEE80211_STA_DISABLE_HT
|
45 IEEE80211_STA_DISABLE_40MHZ
)) {
47 wide_bw_chansw_ie
= NULL
;
48 /* only used for bandwidth here */
52 if (sta_flags
& IEEE80211_STA_DISABLE_VHT
)
53 wide_bw_chansw_ie
= NULL
;
55 if (elems
->ext_chansw_ie
) {
56 if (!ieee80211_operating_class_to_band(
57 elems
->ext_chansw_ie
->new_operating_class
,
60 "cannot understand ECSA IE operating class %d, disconnecting\n",
61 elems
->ext_chansw_ie
->new_operating_class
);
64 new_chan_no
= elems
->ext_chansw_ie
->new_ch_num
;
65 csa_ie
->count
= elems
->ext_chansw_ie
->count
;
66 csa_ie
->mode
= elems
->ext_chansw_ie
->mode
;
67 } else if (elems
->ch_switch_ie
) {
68 new_band
= current_band
;
69 new_chan_no
= elems
->ch_switch_ie
->new_ch_num
;
70 csa_ie
->count
= elems
->ch_switch_ie
->count
;
71 csa_ie
->mode
= elems
->ch_switch_ie
->mode
;
73 /* nothing here we understand */
77 /* Mesh Channel Switch Parameters Element */
78 if (elems
->mesh_chansw_params_ie
) {
79 csa_ie
->ttl
= elems
->mesh_chansw_params_ie
->mesh_ttl
;
80 csa_ie
->mode
= elems
->mesh_chansw_params_ie
->mesh_flags
;
81 csa_ie
->pre_value
= le16_to_cpu(
82 elems
->mesh_chansw_params_ie
->mesh_pre_value
);
85 new_freq
= ieee80211_channel_to_frequency(new_chan_no
, new_band
);
86 new_chan
= ieee80211_get_channel(sdata
->local
->hw
.wiphy
, new_freq
);
87 if (!new_chan
|| new_chan
->flags
& IEEE80211_CHAN_DISABLED
) {
89 "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
95 secondary_channel_offset
= sec_chan_offs
->sec_chan_offs
;
96 } else if (!(sta_flags
& IEEE80211_STA_DISABLE_HT
)) {
97 /* If the secondary channel offset IE is not present,
98 * we can't know what's the post-CSA offset, so the
99 * best we can do is use 20MHz.
101 secondary_channel_offset
= IEEE80211_HT_PARAM_CHA_SEC_NONE
;
104 switch (secondary_channel_offset
) {
106 /* secondary_channel_offset was present but is invalid */
107 case IEEE80211_HT_PARAM_CHA_SEC_NONE
:
108 cfg80211_chandef_create(&csa_ie
->chandef
, new_chan
,
111 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE
:
112 cfg80211_chandef_create(&csa_ie
->chandef
, new_chan
,
113 NL80211_CHAN_HT40PLUS
);
115 case IEEE80211_HT_PARAM_CHA_SEC_BELOW
:
116 cfg80211_chandef_create(&csa_ie
->chandef
, new_chan
,
117 NL80211_CHAN_HT40MINUS
);
120 cfg80211_chandef_create(&csa_ie
->chandef
, new_chan
,
122 /* keep width for 5/10 MHz channels */
123 switch (sdata
->vif
.bss_conf
.chandef
.width
) {
124 case NL80211_CHAN_WIDTH_5
:
125 case NL80211_CHAN_WIDTH_10
:
126 csa_ie
->chandef
.width
=
127 sdata
->vif
.bss_conf
.chandef
.width
;
135 if (wide_bw_chansw_ie
) {
136 new_vht_chandef
.chan
= new_chan
;
137 new_vht_chandef
.center_freq1
=
138 ieee80211_channel_to_frequency(
139 wide_bw_chansw_ie
->new_center_freq_seg0
,
142 switch (wide_bw_chansw_ie
->new_channel_width
) {
144 /* hmmm, ignore VHT and use HT if present */
145 case IEEE80211_VHT_CHANWIDTH_USE_HT
:
146 new_vht_chandef
.chan
= NULL
;
148 case IEEE80211_VHT_CHANWIDTH_80MHZ
:
149 new_vht_chandef
.width
= NL80211_CHAN_WIDTH_80
;
151 case IEEE80211_VHT_CHANWIDTH_160MHZ
:
152 new_vht_chandef
.width
= NL80211_CHAN_WIDTH_160
;
154 case IEEE80211_VHT_CHANWIDTH_80P80MHZ
:
155 /* field is otherwise reserved */
156 new_vht_chandef
.center_freq2
=
157 ieee80211_channel_to_frequency(
158 wide_bw_chansw_ie
->new_center_freq_seg1
,
160 new_vht_chandef
.width
= NL80211_CHAN_WIDTH_80P80
;
163 if (sta_flags
& IEEE80211_STA_DISABLE_80P80MHZ
&&
164 new_vht_chandef
.width
== NL80211_CHAN_WIDTH_80P80
)
165 ieee80211_chandef_downgrade(&new_vht_chandef
);
166 if (sta_flags
& IEEE80211_STA_DISABLE_160MHZ
&&
167 new_vht_chandef
.width
== NL80211_CHAN_WIDTH_160
)
168 ieee80211_chandef_downgrade(&new_vht_chandef
);
169 if (sta_flags
& IEEE80211_STA_DISABLE_40MHZ
&&
170 new_vht_chandef
.width
> NL80211_CHAN_WIDTH_20
)
171 ieee80211_chandef_downgrade(&new_vht_chandef
);
174 /* if VHT data is there validate & use it */
175 if (new_vht_chandef
.chan
) {
176 if (!cfg80211_chandef_compatible(&new_vht_chandef
,
179 "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
183 csa_ie
->chandef
= new_vht_chandef
;
189 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data
*sdata
,
190 struct ieee80211_msrment_ie
*request_ie
,
191 const u8
*da
, const u8
*bssid
,
194 struct ieee80211_local
*local
= sdata
->local
;
196 struct ieee80211_mgmt
*msr_report
;
198 skb
= dev_alloc_skb(sizeof(*msr_report
) + local
->hw
.extra_tx_headroom
+
199 sizeof(struct ieee80211_msrment_ie
));
203 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
204 msr_report
= (struct ieee80211_mgmt
*)skb_put(skb
, 24);
205 memset(msr_report
, 0, 24);
206 memcpy(msr_report
->da
, da
, ETH_ALEN
);
207 memcpy(msr_report
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
208 memcpy(msr_report
->bssid
, bssid
, ETH_ALEN
);
209 msr_report
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
210 IEEE80211_STYPE_ACTION
);
212 skb_put(skb
, 1 + sizeof(msr_report
->u
.action
.u
.measurement
));
213 msr_report
->u
.action
.category
= WLAN_CATEGORY_SPECTRUM_MGMT
;
214 msr_report
->u
.action
.u
.measurement
.action_code
=
215 WLAN_ACTION_SPCT_MSR_RPRT
;
216 msr_report
->u
.action
.u
.measurement
.dialog_token
= dialog_token
;
218 msr_report
->u
.action
.u
.measurement
.element_id
= WLAN_EID_MEASURE_REPORT
;
219 msr_report
->u
.action
.u
.measurement
.length
=
220 sizeof(struct ieee80211_msrment_ie
);
222 memset(&msr_report
->u
.action
.u
.measurement
.msr_elem
, 0,
223 sizeof(struct ieee80211_msrment_ie
));
224 msr_report
->u
.action
.u
.measurement
.msr_elem
.token
= request_ie
->token
;
225 msr_report
->u
.action
.u
.measurement
.msr_elem
.mode
|=
226 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED
;
227 msr_report
->u
.action
.u
.measurement
.msr_elem
.type
= request_ie
->type
;
229 ieee80211_tx_skb(sdata
, skb
);
232 void ieee80211_process_measurement_req(struct ieee80211_sub_if_data
*sdata
,
233 struct ieee80211_mgmt
*mgmt
,
237 * Ignoring measurement request is spec violation.
238 * Mandatory measurements must be reported optional
239 * measurements might be refused or reported incapable
240 * For now just refuse
241 * TODO: Answer basic measurement as unmeasured
243 ieee80211_send_refuse_measurement_request(sdata
,
244 &mgmt
->u
.action
.u
.measurement
.msr_elem
,
245 mgmt
->sa
, mgmt
->bssid
,
246 mgmt
->u
.action
.u
.measurement
.dialog_token
);