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
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.
18 #include <linux/ieee80211.h>
19 #include <net/cfg80211.h>
20 #include <net/mac80211.h>
21 #include "ieee80211_i.h"
25 int 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)
31 enum nl80211_band new_band = current_band;
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;
40 sec_chan_offs = elems->sec_chan_offs;
41 wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
43 if (sta_flags & (IEEE80211_STA_DISABLE_HT |
44 IEEE80211_STA_DISABLE_40MHZ)) {
46 wide_bw_chansw_ie = NULL;
49 if (sta_flags & IEEE80211_STA_DISABLE_VHT)
50 wide_bw_chansw_ie = NULL;
52 if (elems->ext_chansw_ie) {
53 if (!ieee80211_operating_class_to_band(
54 elems->ext_chansw_ie->new_operating_class,
57 "cannot understand ECSA IE operating class, %d, ignoring\n",
58 elems->ext_chansw_ie->new_operating_class);
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;
68 /* nothing here we understand */
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);
80 new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
81 new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
82 if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
84 "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
90 secondary_channel_offset = sec_chan_offs->sec_chan_offs;
91 } else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) {
92 /* If the secondary channel offset IE is not present,
93 * we can't know what's the post-CSA offset, so the
94 * best we can do is use 20MHz.
96 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
99 switch (secondary_channel_offset) {
101 /* secondary_channel_offset was present but is invalid */
102 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
103 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
106 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
107 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
108 NL80211_CHAN_HT40PLUS);
110 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
111 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
112 NL80211_CHAN_HT40MINUS);
115 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
117 /* keep width for 5/10 MHz channels */
118 switch (sdata->vif.bss_conf.chandef.width) {
119 case NL80211_CHAN_WIDTH_5:
120 case NL80211_CHAN_WIDTH_10:
121 csa_ie->chandef.width =
122 sdata->vif.bss_conf.chandef.width;
130 if (wide_bw_chansw_ie) {
131 struct ieee80211_vht_operation vht_oper = {
133 wide_bw_chansw_ie->new_channel_width,
134 .center_freq_seg1_idx =
135 wide_bw_chansw_ie->new_center_freq_seg0,
136 .center_freq_seg2_idx =
137 wide_bw_chansw_ie->new_center_freq_seg1,
138 /* .basic_mcs_set doesn't matter */
141 /* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT,
142 * to the previously parsed chandef
144 new_vht_chandef = csa_ie->chandef;
146 /* ignore if parsing fails */
147 if (!ieee80211_chandef_vht_oper(&vht_oper, &new_vht_chandef))
148 new_vht_chandef.chan = NULL;
150 if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
151 new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
152 ieee80211_chandef_downgrade(&new_vht_chandef);
153 if (sta_flags & IEEE80211_STA_DISABLE_160MHZ &&
154 new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
155 ieee80211_chandef_downgrade(&new_vht_chandef);
158 /* if VHT data is there validate & use it */
159 if (new_vht_chandef.chan) {
160 if (!cfg80211_chandef_compatible(&new_vht_chandef,
163 "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
167 csa_ie->chandef = new_vht_chandef;
173 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
174 struct ieee80211_msrment_ie *request_ie,
175 const u8 *da, const u8 *bssid,
178 struct ieee80211_local *local = sdata->local;
180 struct ieee80211_mgmt *msr_report;
182 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
183 sizeof(struct ieee80211_msrment_ie));
187 skb_reserve(skb, local->hw.extra_tx_headroom);
188 msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
189 memset(msr_report, 0, 24);
190 memcpy(msr_report->da, da, ETH_ALEN);
191 memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
192 memcpy(msr_report->bssid, bssid, ETH_ALEN);
193 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
194 IEEE80211_STYPE_ACTION);
196 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
197 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
198 msr_report->u.action.u.measurement.action_code =
199 WLAN_ACTION_SPCT_MSR_RPRT;
200 msr_report->u.action.u.measurement.dialog_token = dialog_token;
202 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
203 msr_report->u.action.u.measurement.length =
204 sizeof(struct ieee80211_msrment_ie);
206 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
207 sizeof(struct ieee80211_msrment_ie));
208 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
209 msr_report->u.action.u.measurement.msr_elem.mode |=
210 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
211 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
213 ieee80211_tx_skb(sdata, skb);
216 void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
217 struct ieee80211_mgmt *mgmt,
221 * Ignoring measurement request is spec violation.
222 * Mandatory measurements must be reported optional
223 * measurements might be refused or reported incapable
224 * For now just refuse
225 * TODO: Answer basic measurement as unmeasured
227 ieee80211_send_refuse_measurement_request(sdata,
228 &mgmt->u.action.u.measurement.msr_elem,
229 mgmt->sa, mgmt->bssid,
230 mgmt->u.action.u.measurement.dialog_token);