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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/cfg80211.h>
19#include <net/mac80211.h>
20#include "ieee80211_i.h"
21#include "sta_info.h"
22#include "wme.h"
23
24int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
25 struct ieee802_11_elems *elems,
26 enum nl80211_band current_band,
27 u32 sta_flags, u8 *bssid,
28 struct ieee80211_csa_ie *csa_ie)
29{
30 enum nl80211_band new_band;
31 int new_freq;
32 u8 new_chan_no;
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 int secondary_channel_offset = -1;
38
39 sec_chan_offs = elems->sec_chan_offs;
40 wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
41
42 if (sta_flags & (IEEE80211_STA_DISABLE_HT |
43 IEEE80211_STA_DISABLE_40MHZ)) {
44 sec_chan_offs = NULL;
45 wide_bw_chansw_ie = NULL;
46 }
47
48 if (sta_flags & IEEE80211_STA_DISABLE_VHT)
49 wide_bw_chansw_ie = NULL;
50
51 if (elems->ext_chansw_ie) {
52 if (!ieee80211_operating_class_to_band(
53 elems->ext_chansw_ie->new_operating_class,
54 &new_band)) {
55 sdata_info(sdata,
56 "cannot understand ECSA IE operating class %d, disconnecting\n",
57 elems->ext_chansw_ie->new_operating_class);
58 return -EINVAL;
59 }
60 new_chan_no = elems->ext_chansw_ie->new_ch_num;
61 csa_ie->count = elems->ext_chansw_ie->count;
62 csa_ie->mode = elems->ext_chansw_ie->mode;
63 } else if (elems->ch_switch_ie) {
64 new_band = current_band;
65 new_chan_no = elems->ch_switch_ie->new_ch_num;
66 csa_ie->count = elems->ch_switch_ie->count;
67 csa_ie->mode = elems->ch_switch_ie->mode;
68 } else {
69 /* nothing here we understand */
70 return 1;
71 }
72
73 /* Mesh Channel Switch Parameters Element */
74 if (elems->mesh_chansw_params_ie) {
75 csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
76 csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags;
77 csa_ie->pre_value = le16_to_cpu(
78 elems->mesh_chansw_params_ie->mesh_pre_value);
79 }
80
81 new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
82 new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
83 if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
84 sdata_info(sdata,
85 "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
86 bssid, new_freq);
87 return -EINVAL;
88 }
89
90 if (sec_chan_offs) {
91 secondary_channel_offset = sec_chan_offs->sec_chan_offs;
92 } else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) {
93 /* If the secondary channel offset IE is not present,
94 * we can't know what's the post-CSA offset, so the
95 * best we can do is use 20MHz.
96 */
97 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
98 }
99
100 switch (secondary_channel_offset) {
101 default:
102 /* secondary_channel_offset was present but is invalid */
103 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
104 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
105 NL80211_CHAN_HT20);
106 break;
107 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
108 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
109 NL80211_CHAN_HT40PLUS);
110 break;
111 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
112 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
113 NL80211_CHAN_HT40MINUS);
114 break;
115 case -1:
116 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
117 NL80211_CHAN_NO_HT);
118 /* keep width for 5/10 MHz channels */
119 switch (sdata->vif.bss_conf.chandef.width) {
120 case NL80211_CHAN_WIDTH_5:
121 case NL80211_CHAN_WIDTH_10:
122 csa_ie->chandef.width =
123 sdata->vif.bss_conf.chandef.width;
124 break;
125 default:
126 break;
127 }
128 break;
129 }
130
131 if (wide_bw_chansw_ie) {
132 struct ieee80211_vht_operation vht_oper = {
133 .chan_width =
134 wide_bw_chansw_ie->new_channel_width,
135 .center_freq_seg1_idx =
136 wide_bw_chansw_ie->new_center_freq_seg0,
137 .center_freq_seg2_idx =
138 wide_bw_chansw_ie->new_center_freq_seg1,
139 /* .basic_mcs_set doesn't matter */
140 };
141
142 /* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT,
143 * to the previously parsed chandef
144 */
145 new_vht_chandef = csa_ie->chandef;
146
147 /* ignore if parsing fails */
148 if (!ieee80211_chandef_vht_oper(&vht_oper, &new_vht_chandef))
149 new_vht_chandef.chan = NULL;
150
151 if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
152 new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
153 ieee80211_chandef_downgrade(&new_vht_chandef);
154 if (sta_flags & IEEE80211_STA_DISABLE_160MHZ &&
155 new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
156 ieee80211_chandef_downgrade(&new_vht_chandef);
157 }
158
159 /* if VHT data is there validate & use it */
160 if (new_vht_chandef.chan) {
161 if (!cfg80211_chandef_compatible(&new_vht_chandef,
162 &csa_ie->chandef)) {
163 sdata_info(sdata,
164 "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
165 bssid);
166 return -EINVAL;
167 }
168 csa_ie->chandef = new_vht_chandef;
169 }
170
171 return 0;
172}
173
174static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
175 struct ieee80211_msrment_ie *request_ie,
176 const u8 *da, const u8 *bssid,
177 u8 dialog_token)
178{
179 struct ieee80211_local *local = sdata->local;
180 struct sk_buff *skb;
181 struct ieee80211_mgmt *msr_report;
182
183 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
184 sizeof(struct ieee80211_msrment_ie));
185 if (!skb)
186 return;
187
188 skb_reserve(skb, local->hw.extra_tx_headroom);
189 msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
190 memset(msr_report, 0, 24);
191 memcpy(msr_report->da, da, ETH_ALEN);
192 memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
193 memcpy(msr_report->bssid, bssid, ETH_ALEN);
194 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
195 IEEE80211_STYPE_ACTION);
196
197 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
198 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
199 msr_report->u.action.u.measurement.action_code =
200 WLAN_ACTION_SPCT_MSR_RPRT;
201 msr_report->u.action.u.measurement.dialog_token = dialog_token;
202
203 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
204 msr_report->u.action.u.measurement.length =
205 sizeof(struct ieee80211_msrment_ie);
206
207 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
208 sizeof(struct ieee80211_msrment_ie));
209 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
210 msr_report->u.action.u.measurement.msr_elem.mode |=
211 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
212 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
213
214 ieee80211_tx_skb(sdata, skb);
215}
216
217void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
218 struct ieee80211_mgmt *mgmt,
219 size_t len)
220{
221 /*
222 * Ignoring measurement request is spec violation.
223 * Mandatory measurements must be reported optional
224 * measurements might be refused or reported incapable
225 * For now just refuse
226 * TODO: Answer basic measurement as unmeasured
227 */
228 ieee80211_send_refuse_measurement_request(sdata,
229 &mgmt->u.action.u.measurement.msr_elem,
230 mgmt->sa, mgmt->bssid,
231 mgmt->u.action.u.measurement.dialog_token);
232}
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 * Copyright (C) 2018 Intel Corporation
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18#include <linux/ieee80211.h>
19#include <net/cfg80211.h>
20#include <net/mac80211.h>
21#include "ieee80211_i.h"
22#include "sta_info.h"
23#include "wme.h"
24
25int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
26 struct ieee802_11_elems *elems,
27 enum nl80211_band current_band,
28 u32 sta_flags, u8 *bssid,
29 struct ieee80211_csa_ie *csa_ie)
30{
31 enum nl80211_band new_band = current_band;
32 int new_freq;
33 u8 new_chan_no;
34 struct ieee80211_channel *new_chan;
35 struct cfg80211_chan_def new_vht_chandef = {};
36 const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
37 const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
38 int secondary_channel_offset = -1;
39
40 memset(csa_ie, 0, sizeof(*csa_ie));
41
42 sec_chan_offs = elems->sec_chan_offs;
43 wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
44
45 if (sta_flags & (IEEE80211_STA_DISABLE_HT |
46 IEEE80211_STA_DISABLE_40MHZ)) {
47 sec_chan_offs = NULL;
48 wide_bw_chansw_ie = NULL;
49 }
50
51 if (sta_flags & IEEE80211_STA_DISABLE_VHT)
52 wide_bw_chansw_ie = NULL;
53
54 if (elems->ext_chansw_ie) {
55 if (!ieee80211_operating_class_to_band(
56 elems->ext_chansw_ie->new_operating_class,
57 &new_band)) {
58 sdata_info(sdata,
59 "cannot understand ECSA IE operating class, %d, ignoring\n",
60 elems->ext_chansw_ie->new_operating_class);
61 }
62 new_chan_no = elems->ext_chansw_ie->new_ch_num;
63 csa_ie->count = elems->ext_chansw_ie->count;
64 csa_ie->mode = elems->ext_chansw_ie->mode;
65 } else if (elems->ch_switch_ie) {
66 new_chan_no = elems->ch_switch_ie->new_ch_num;
67 csa_ie->count = elems->ch_switch_ie->count;
68 csa_ie->mode = elems->ch_switch_ie->mode;
69 } else {
70 /* nothing here we understand */
71 return 1;
72 }
73
74 /* Mesh Channel Switch Parameters Element */
75 if (elems->mesh_chansw_params_ie) {
76 csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
77 csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags;
78 csa_ie->pre_value = le16_to_cpu(
79 elems->mesh_chansw_params_ie->mesh_pre_value);
80
81 if (elems->mesh_chansw_params_ie->mesh_flags &
82 WLAN_EID_CHAN_SWITCH_PARAM_REASON)
83 csa_ie->reason_code = le16_to_cpu(
84 elems->mesh_chansw_params_ie->mesh_reason);
85 }
86
87 new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
88 new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
89 if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
90 sdata_info(sdata,
91 "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
92 bssid, new_freq);
93 return -EINVAL;
94 }
95
96 if (sec_chan_offs) {
97 secondary_channel_offset = sec_chan_offs->sec_chan_offs;
98 } else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) {
99 /* If the secondary channel offset IE is not present,
100 * we can't know what's the post-CSA offset, so the
101 * best we can do is use 20MHz.
102 */
103 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
104 }
105
106 switch (secondary_channel_offset) {
107 default:
108 /* secondary_channel_offset was present but is invalid */
109 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
110 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
111 NL80211_CHAN_HT20);
112 break;
113 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
114 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
115 NL80211_CHAN_HT40PLUS);
116 break;
117 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
118 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
119 NL80211_CHAN_HT40MINUS);
120 break;
121 case -1:
122 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
123 NL80211_CHAN_NO_HT);
124 /* keep width for 5/10 MHz channels */
125 switch (sdata->vif.bss_conf.chandef.width) {
126 case NL80211_CHAN_WIDTH_5:
127 case NL80211_CHAN_WIDTH_10:
128 csa_ie->chandef.width =
129 sdata->vif.bss_conf.chandef.width;
130 break;
131 default:
132 break;
133 }
134 break;
135 }
136
137 if (wide_bw_chansw_ie) {
138 struct ieee80211_vht_operation vht_oper = {
139 .chan_width =
140 wide_bw_chansw_ie->new_channel_width,
141 .center_freq_seg0_idx =
142 wide_bw_chansw_ie->new_center_freq_seg0,
143 .center_freq_seg1_idx =
144 wide_bw_chansw_ie->new_center_freq_seg1,
145 /* .basic_mcs_set doesn't matter */
146 };
147
148 /* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT,
149 * to the previously parsed chandef
150 */
151 new_vht_chandef = csa_ie->chandef;
152
153 /* ignore if parsing fails */
154 if (!ieee80211_chandef_vht_oper(&vht_oper, &new_vht_chandef))
155 new_vht_chandef.chan = NULL;
156
157 if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
158 new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
159 ieee80211_chandef_downgrade(&new_vht_chandef);
160 if (sta_flags & IEEE80211_STA_DISABLE_160MHZ &&
161 new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
162 ieee80211_chandef_downgrade(&new_vht_chandef);
163 }
164
165 /* if VHT data is there validate & use it */
166 if (new_vht_chandef.chan) {
167 if (!cfg80211_chandef_compatible(&new_vht_chandef,
168 &csa_ie->chandef)) {
169 sdata_info(sdata,
170 "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
171 bssid);
172 return -EINVAL;
173 }
174 csa_ie->chandef = new_vht_chandef;
175 }
176
177 return 0;
178}
179
180static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
181 struct ieee80211_msrment_ie *request_ie,
182 const u8 *da, const u8 *bssid,
183 u8 dialog_token)
184{
185 struct ieee80211_local *local = sdata->local;
186 struct sk_buff *skb;
187 struct ieee80211_mgmt *msr_report;
188
189 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
190 sizeof(struct ieee80211_msrment_ie));
191 if (!skb)
192 return;
193
194 skb_reserve(skb, local->hw.extra_tx_headroom);
195 msr_report = skb_put_zero(skb, 24);
196 memcpy(msr_report->da, da, ETH_ALEN);
197 memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
198 memcpy(msr_report->bssid, bssid, ETH_ALEN);
199 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
200 IEEE80211_STYPE_ACTION);
201
202 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
203 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
204 msr_report->u.action.u.measurement.action_code =
205 WLAN_ACTION_SPCT_MSR_RPRT;
206 msr_report->u.action.u.measurement.dialog_token = dialog_token;
207
208 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
209 msr_report->u.action.u.measurement.length =
210 sizeof(struct ieee80211_msrment_ie);
211
212 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
213 sizeof(struct ieee80211_msrment_ie));
214 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
215 msr_report->u.action.u.measurement.msr_elem.mode |=
216 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
217 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
218
219 ieee80211_tx_skb(sdata, skb);
220}
221
222void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
223 struct ieee80211_mgmt *mgmt,
224 size_t len)
225{
226 /*
227 * Ignoring measurement request is spec violation.
228 * Mandatory measurements must be reported optional
229 * measurements might be refused or reported incapable
230 * For now just refuse
231 * TODO: Answer basic measurement as unmeasured
232 */
233 ieee80211_send_refuse_measurement_request(sdata,
234 &mgmt->u.action.u.measurement.msr_elem,
235 mgmt->sa, mgmt->bssid,
236 mgmt->u.action.u.measurement.dialog_token);
237}