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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// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * spectrum management
4 *
5 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
6 * Copyright 2002-2005, Instant802 Networks, Inc.
7 * Copyright 2005-2006, Devicescape Software, Inc.
8 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
9 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
10 * Copyright 2007-2008, Intel Corporation
11 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
12 * Copyright (C) 2018 Intel Corporation
13 */
14
15#include <linux/ieee80211.h>
16#include <net/cfg80211.h>
17#include <net/mac80211.h>
18#include "ieee80211_i.h"
19#include "sta_info.h"
20#include "wme.h"
21
22int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
23 struct ieee802_11_elems *elems,
24 enum nl80211_band current_band,
25 u32 sta_flags, u8 *bssid,
26 struct ieee80211_csa_ie *csa_ie)
27{
28 enum nl80211_band new_band = current_band;
29 int new_freq;
30 u8 new_chan_no;
31 struct ieee80211_channel *new_chan;
32 struct cfg80211_chan_def new_vht_chandef = {};
33 const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
34 const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
35 int secondary_channel_offset = -1;
36
37 memset(csa_ie, 0, sizeof(*csa_ie));
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, ignoring\n",
57 elems->ext_chansw_ie->new_operating_class);
58 }
59 new_chan_no = elems->ext_chansw_ie->new_ch_num;
60 csa_ie->count = elems->ext_chansw_ie->count;
61 csa_ie->mode = elems->ext_chansw_ie->mode;
62 } else if (elems->ch_switch_ie) {
63 new_chan_no = elems->ch_switch_ie->new_ch_num;
64 csa_ie->count = elems->ch_switch_ie->count;
65 csa_ie->mode = elems->ch_switch_ie->mode;
66 } else {
67 /* nothing here we understand */
68 return 1;
69 }
70
71 /* Mesh Channel Switch Parameters Element */
72 if (elems->mesh_chansw_params_ie) {
73 csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
74 csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags;
75 csa_ie->pre_value = le16_to_cpu(
76 elems->mesh_chansw_params_ie->mesh_pre_value);
77
78 if (elems->mesh_chansw_params_ie->mesh_flags &
79 WLAN_EID_CHAN_SWITCH_PARAM_REASON)
80 csa_ie->reason_code = le16_to_cpu(
81 elems->mesh_chansw_params_ie->mesh_reason);
82 }
83
84 new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
85 new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
86 if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
87 sdata_info(sdata,
88 "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
89 bssid, new_freq);
90 return -EINVAL;
91 }
92
93 if (sec_chan_offs) {
94 secondary_channel_offset = sec_chan_offs->sec_chan_offs;
95 } else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) {
96 /* If the secondary channel offset IE is not present,
97 * we can't know what's the post-CSA offset, so the
98 * best we can do is use 20MHz.
99 */
100 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
101 }
102
103 switch (secondary_channel_offset) {
104 default:
105 /* secondary_channel_offset was present but is invalid */
106 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
107 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
108 NL80211_CHAN_HT20);
109 break;
110 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
111 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
112 NL80211_CHAN_HT40PLUS);
113 break;
114 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
115 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
116 NL80211_CHAN_HT40MINUS);
117 break;
118 case -1:
119 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
120 NL80211_CHAN_NO_HT);
121 /* keep width for 5/10 MHz channels */
122 switch (sdata->vif.bss_conf.chandef.width) {
123 case NL80211_CHAN_WIDTH_5:
124 case NL80211_CHAN_WIDTH_10:
125 csa_ie->chandef.width =
126 sdata->vif.bss_conf.chandef.width;
127 break;
128 default:
129 break;
130 }
131 break;
132 }
133
134 if (wide_bw_chansw_ie) {
135 struct ieee80211_vht_operation vht_oper = {
136 .chan_width =
137 wide_bw_chansw_ie->new_channel_width,
138 .center_freq_seg0_idx =
139 wide_bw_chansw_ie->new_center_freq_seg0,
140 .center_freq_seg1_idx =
141 wide_bw_chansw_ie->new_center_freq_seg1,
142 /* .basic_mcs_set doesn't matter */
143 };
144 struct ieee80211_ht_operation ht_oper = {};
145
146 /* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT,
147 * to the previously parsed chandef
148 */
149 new_vht_chandef = csa_ie->chandef;
150
151 /* ignore if parsing fails */
152 if (!ieee80211_chandef_vht_oper(&sdata->local->hw,
153 &vht_oper, &ht_oper,
154 &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 if (elems->max_channel_switch_time)
178 csa_ie->max_switch_time =
179 (elems->max_channel_switch_time[0] << 0) |
180 (elems->max_channel_switch_time[1] << 8) |
181 (elems->max_channel_switch_time[2] << 16);
182
183 return 0;
184}
185
186static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
187 struct ieee80211_msrment_ie *request_ie,
188 const u8 *da, const u8 *bssid,
189 u8 dialog_token)
190{
191 struct ieee80211_local *local = sdata->local;
192 struct sk_buff *skb;
193 struct ieee80211_mgmt *msr_report;
194
195 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
196 sizeof(struct ieee80211_msrment_ie));
197 if (!skb)
198 return;
199
200 skb_reserve(skb, local->hw.extra_tx_headroom);
201 msr_report = skb_put_zero(skb, 24);
202 memcpy(msr_report->da, da, ETH_ALEN);
203 memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
204 memcpy(msr_report->bssid, bssid, ETH_ALEN);
205 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
206 IEEE80211_STYPE_ACTION);
207
208 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
209 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
210 msr_report->u.action.u.measurement.action_code =
211 WLAN_ACTION_SPCT_MSR_RPRT;
212 msr_report->u.action.u.measurement.dialog_token = dialog_token;
213
214 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
215 msr_report->u.action.u.measurement.length =
216 sizeof(struct ieee80211_msrment_ie);
217
218 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
219 sizeof(struct ieee80211_msrment_ie));
220 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
221 msr_report->u.action.u.measurement.msr_elem.mode |=
222 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
223 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
224
225 ieee80211_tx_skb(sdata, skb);
226}
227
228void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
229 struct ieee80211_mgmt *mgmt,
230 size_t len)
231{
232 /*
233 * Ignoring measurement request is spec violation.
234 * Mandatory measurements must be reported optional
235 * measurements might be refused or reported incapable
236 * For now just refuse
237 * TODO: Answer basic measurement as unmeasured
238 */
239 ieee80211_send_refuse_measurement_request(sdata,
240 &mgmt->u.action.u.measurement.msr_elem,
241 mgmt->sa, mgmt->bssid,
242 mgmt->u.action.u.measurement.dialog_token);
243}