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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, 2020 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 vht_cap_info,
26 u32 sta_flags, u8 *bssid,
27 struct ieee80211_csa_ie *csa_ie)
28{
29 enum nl80211_band new_band = current_band;
30 int new_freq;
31 u8 new_chan_no;
32 struct ieee80211_channel *new_chan;
33 struct cfg80211_chan_def new_vht_chandef = {};
34 const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
35 const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
36 int secondary_channel_offset = -1;
37
38 memset(csa_ie, 0, sizeof(*csa_ie));
39
40 sec_chan_offs = elems->sec_chan_offs;
41 wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
42
43 if (sta_flags & (IEEE80211_STA_DISABLE_HT |
44 IEEE80211_STA_DISABLE_40MHZ)) {
45 sec_chan_offs = NULL;
46 wide_bw_chansw_ie = NULL;
47 }
48
49 if (sta_flags & IEEE80211_STA_DISABLE_VHT)
50 wide_bw_chansw_ie = NULL;
51
52 if (elems->ext_chansw_ie) {
53 if (!ieee80211_operating_class_to_band(
54 elems->ext_chansw_ie->new_operating_class,
55 &new_band)) {
56 sdata_info(sdata,
57 "cannot understand ECSA IE operating class, %d, ignoring\n",
58 elems->ext_chansw_ie->new_operating_class);
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_chan_no = elems->ch_switch_ie->new_ch_num;
65 csa_ie->count = elems->ch_switch_ie->count;
66 csa_ie->mode = elems->ch_switch_ie->mode;
67 } else {
68 /* nothing here we understand */
69 return 1;
70 }
71
72 /* Mesh Channel Switch Parameters Element */
73 if (elems->mesh_chansw_params_ie) {
74 csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
75 csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags;
76 csa_ie->pre_value = le16_to_cpu(
77 elems->mesh_chansw_params_ie->mesh_pre_value);
78
79 if (elems->mesh_chansw_params_ie->mesh_flags &
80 WLAN_EID_CHAN_SWITCH_PARAM_REASON)
81 csa_ie->reason_code = le16_to_cpu(
82 elems->mesh_chansw_params_ie->mesh_reason);
83 }
84
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) {
88 sdata_info(sdata,
89 "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
90 bssid, new_freq);
91 return -EINVAL;
92 }
93
94 if (sec_chan_offs) {
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.
100 */
101 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
102 }
103
104 switch (secondary_channel_offset) {
105 default:
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,
109 NL80211_CHAN_HT20);
110 break;
111 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
112 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
113 NL80211_CHAN_HT40PLUS);
114 break;
115 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
116 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
117 NL80211_CHAN_HT40MINUS);
118 break;
119 case -1:
120 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
121 NL80211_CHAN_NO_HT);
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;
128 break;
129 default:
130 break;
131 }
132 break;
133 }
134
135 if (wide_bw_chansw_ie) {
136 u8 new_seg1 = wide_bw_chansw_ie->new_center_freq_seg1;
137 struct ieee80211_vht_operation vht_oper = {
138 .chan_width =
139 wide_bw_chansw_ie->new_channel_width,
140 .center_freq_seg0_idx =
141 wide_bw_chansw_ie->new_center_freq_seg0,
142 .center_freq_seg1_idx = new_seg1,
143 /* .basic_mcs_set doesn't matter */
144 };
145 struct ieee80211_ht_operation ht_oper = {
146 .operation_mode =
147 cpu_to_le16(new_seg1 <<
148 IEEE80211_HT_OP_MODE_CCFS2_SHIFT),
149 };
150
151 /* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT,
152 * to the previously parsed chandef
153 */
154 new_vht_chandef = csa_ie->chandef;
155
156 /* ignore if parsing fails */
157 if (!ieee80211_chandef_vht_oper(&sdata->local->hw,
158 vht_cap_info,
159 &vht_oper, &ht_oper,
160 &new_vht_chandef))
161 new_vht_chandef.chan = NULL;
162
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 }
170
171 /* if VHT data is there validate & use it */
172 if (new_vht_chandef.chan) {
173 if (!cfg80211_chandef_compatible(&new_vht_chandef,
174 &csa_ie->chandef)) {
175 sdata_info(sdata,
176 "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
177 bssid);
178 return -EINVAL;
179 }
180 csa_ie->chandef = new_vht_chandef;
181 }
182
183 if (elems->max_channel_switch_time)
184 csa_ie->max_switch_time =
185 (elems->max_channel_switch_time[0] << 0) |
186 (elems->max_channel_switch_time[1] << 8) |
187 (elems->max_channel_switch_time[2] << 16);
188
189 return 0;
190}
191
192static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
193 struct ieee80211_msrment_ie *request_ie,
194 const u8 *da, const u8 *bssid,
195 u8 dialog_token)
196{
197 struct ieee80211_local *local = sdata->local;
198 struct sk_buff *skb;
199 struct ieee80211_mgmt *msr_report;
200
201 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
202 sizeof(struct ieee80211_msrment_ie));
203 if (!skb)
204 return;
205
206 skb_reserve(skb, local->hw.extra_tx_headroom);
207 msr_report = skb_put_zero(skb, 24);
208 memcpy(msr_report->da, da, ETH_ALEN);
209 memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
210 memcpy(msr_report->bssid, bssid, ETH_ALEN);
211 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
212 IEEE80211_STYPE_ACTION);
213
214 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
215 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
216 msr_report->u.action.u.measurement.action_code =
217 WLAN_ACTION_SPCT_MSR_RPRT;
218 msr_report->u.action.u.measurement.dialog_token = dialog_token;
219
220 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
221 msr_report->u.action.u.measurement.length =
222 sizeof(struct ieee80211_msrment_ie);
223
224 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
225 sizeof(struct ieee80211_msrment_ie));
226 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
227 msr_report->u.action.u.measurement.msr_elem.mode |=
228 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
229 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
230
231 ieee80211_tx_skb(sdata, skb);
232}
233
234void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
235 struct ieee80211_mgmt *mgmt,
236 size_t len)
237{
238 /*
239 * Ignoring measurement request is spec violation.
240 * Mandatory measurements must be reported optional
241 * measurements might be refused or reported incapable
242 * For now just refuse
243 * TODO: Answer basic measurement as unmeasured
244 */
245 ieee80211_send_refuse_measurement_request(sdata,
246 &mgmt->u.action.u.measurement.msr_elem,
247 mgmt->sa, mgmt->bssid,
248 mgmt->u.action.u.measurement.dialog_token);
249}
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, 2020, 2022 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 vht_cap_info,
26 ieee80211_conn_flags_t conn_flags, u8 *bssid,
27 struct ieee80211_csa_ie *csa_ie)
28{
29 enum nl80211_band new_band = current_band;
30 int new_freq;
31 u8 new_chan_no;
32 struct ieee80211_channel *new_chan;
33 struct cfg80211_chan_def new_vht_chandef = {};
34 const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
35 const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
36 int secondary_channel_offset = -1;
37
38 memset(csa_ie, 0, sizeof(*csa_ie));
39
40 sec_chan_offs = elems->sec_chan_offs;
41 wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
42
43 if (conn_flags & (IEEE80211_CONN_DISABLE_HT |
44 IEEE80211_CONN_DISABLE_40MHZ)) {
45 sec_chan_offs = NULL;
46 wide_bw_chansw_ie = NULL;
47 }
48
49 if (conn_flags & IEEE80211_CONN_DISABLE_VHT)
50 wide_bw_chansw_ie = NULL;
51
52 if (elems->ext_chansw_ie) {
53 if (!ieee80211_operating_class_to_band(
54 elems->ext_chansw_ie->new_operating_class,
55 &new_band)) {
56 sdata_info(sdata,
57 "cannot understand ECSA IE operating class, %d, ignoring\n",
58 elems->ext_chansw_ie->new_operating_class);
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_chan_no = elems->ch_switch_ie->new_ch_num;
65 csa_ie->count = elems->ch_switch_ie->count;
66 csa_ie->mode = elems->ch_switch_ie->mode;
67 } else {
68 /* nothing here we understand */
69 return 1;
70 }
71
72 /* Mesh Channel Switch Parameters Element */
73 if (elems->mesh_chansw_params_ie) {
74 csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
75 csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags;
76 csa_ie->pre_value = le16_to_cpu(
77 elems->mesh_chansw_params_ie->mesh_pre_value);
78
79 if (elems->mesh_chansw_params_ie->mesh_flags &
80 WLAN_EID_CHAN_SWITCH_PARAM_REASON)
81 csa_ie->reason_code = le16_to_cpu(
82 elems->mesh_chansw_params_ie->mesh_reason);
83 }
84
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) {
88 sdata_info(sdata,
89 "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
90 bssid, new_freq);
91 return -EINVAL;
92 }
93
94 if (sec_chan_offs) {
95 secondary_channel_offset = sec_chan_offs->sec_chan_offs;
96 } else if (!(conn_flags & IEEE80211_CONN_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.
100 */
101 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
102 }
103
104 switch (secondary_channel_offset) {
105 default:
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,
109 NL80211_CHAN_HT20);
110 break;
111 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
112 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
113 NL80211_CHAN_HT40PLUS);
114 break;
115 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
116 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
117 NL80211_CHAN_HT40MINUS);
118 break;
119 case -1:
120 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
121 NL80211_CHAN_NO_HT);
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;
128 break;
129 default:
130 break;
131 }
132 break;
133 }
134
135 if (wide_bw_chansw_ie) {
136 u8 new_seg1 = wide_bw_chansw_ie->new_center_freq_seg1;
137 struct ieee80211_vht_operation vht_oper = {
138 .chan_width =
139 wide_bw_chansw_ie->new_channel_width,
140 .center_freq_seg0_idx =
141 wide_bw_chansw_ie->new_center_freq_seg0,
142 .center_freq_seg1_idx = new_seg1,
143 /* .basic_mcs_set doesn't matter */
144 };
145 struct ieee80211_ht_operation ht_oper = {
146 .operation_mode =
147 cpu_to_le16(new_seg1 <<
148 IEEE80211_HT_OP_MODE_CCFS2_SHIFT),
149 };
150
151 /* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT,
152 * to the previously parsed chandef
153 */
154 new_vht_chandef = csa_ie->chandef;
155
156 /* ignore if parsing fails */
157 if (!ieee80211_chandef_vht_oper(&sdata->local->hw,
158 vht_cap_info,
159 &vht_oper, &ht_oper,
160 &new_vht_chandef))
161 new_vht_chandef.chan = NULL;
162
163 if (conn_flags & IEEE80211_CONN_DISABLE_80P80MHZ &&
164 new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
165 ieee80211_chandef_downgrade(&new_vht_chandef);
166 if (conn_flags & IEEE80211_CONN_DISABLE_160MHZ &&
167 new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
168 ieee80211_chandef_downgrade(&new_vht_chandef);
169 }
170
171 /* if VHT data is there validate & use it */
172 if (new_vht_chandef.chan) {
173 if (!cfg80211_chandef_compatible(&new_vht_chandef,
174 &csa_ie->chandef)) {
175 sdata_info(sdata,
176 "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
177 bssid);
178 return -EINVAL;
179 }
180 csa_ie->chandef = new_vht_chandef;
181 }
182
183 if (elems->max_channel_switch_time)
184 csa_ie->max_switch_time =
185 (elems->max_channel_switch_time[0] << 0) |
186 (elems->max_channel_switch_time[1] << 8) |
187 (elems->max_channel_switch_time[2] << 16);
188
189 return 0;
190}
191
192static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
193 struct ieee80211_msrment_ie *request_ie,
194 const u8 *da, const u8 *bssid,
195 u8 dialog_token)
196{
197 struct ieee80211_local *local = sdata->local;
198 struct sk_buff *skb;
199 struct ieee80211_mgmt *msr_report;
200
201 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
202 sizeof(struct ieee80211_msrment_ie));
203 if (!skb)
204 return;
205
206 skb_reserve(skb, local->hw.extra_tx_headroom);
207 msr_report = skb_put_zero(skb, 24);
208 memcpy(msr_report->da, da, ETH_ALEN);
209 memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
210 memcpy(msr_report->bssid, bssid, ETH_ALEN);
211 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
212 IEEE80211_STYPE_ACTION);
213
214 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
215 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
216 msr_report->u.action.u.measurement.action_code =
217 WLAN_ACTION_SPCT_MSR_RPRT;
218 msr_report->u.action.u.measurement.dialog_token = dialog_token;
219
220 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
221 msr_report->u.action.u.measurement.length =
222 sizeof(struct ieee80211_msrment_ie);
223
224 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
225 sizeof(struct ieee80211_msrment_ie));
226 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
227 msr_report->u.action.u.measurement.msr_elem.mode |=
228 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
229 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
230
231 ieee80211_tx_skb(sdata, skb);
232}
233
234void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
235 struct ieee80211_mgmt *mgmt,
236 size_t len)
237{
238 /*
239 * Ignoring measurement request is spec violation.
240 * Mandatory measurements must be reported optional
241 * measurements might be refused or reported incapable
242 * For now just refuse
243 * TODO: Answer basic measurement as unmeasured
244 */
245 ieee80211_send_refuse_measurement_request(sdata,
246 &mgmt->u.action.u.measurement.msr_elem,
247 mgmt->sa, mgmt->bssid,
248 mgmt->u.action.u.measurement.dialog_token);
249}