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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 ieee80211_band current_band,
27 u32 sta_flags, u8 *bssid,
28 struct ieee80211_csa_ie *csa_ie)
29{
30 enum ieee80211_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
70 return 1;
71 }
72
73
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
94
95
96
97 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
98 }
99
100 switch (secondary_channel_offset) {
101 default:
102
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
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 new_vht_chandef.chan = new_chan;
133 new_vht_chandef.center_freq1 =
134 ieee80211_channel_to_frequency(
135 wide_bw_chansw_ie->new_center_freq_seg0,
136 new_band);
137
138 switch (wide_bw_chansw_ie->new_channel_width) {
139 default:
140
141 case IEEE80211_VHT_CHANWIDTH_USE_HT:
142 new_vht_chandef.chan = NULL;
143 break;
144 case IEEE80211_VHT_CHANWIDTH_80MHZ:
145 new_vht_chandef.width = NL80211_CHAN_WIDTH_80;
146 break;
147 case IEEE80211_VHT_CHANWIDTH_160MHZ:
148 new_vht_chandef.width = NL80211_CHAN_WIDTH_160;
149 break;
150 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
151
152 new_vht_chandef.center_freq2 =
153 ieee80211_channel_to_frequency(
154 wide_bw_chansw_ie->new_center_freq_seg1,
155 new_band);
156 new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
157 break;
158 }
159 if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
160 new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
161 ieee80211_chandef_downgrade(&new_vht_chandef);
162 if (sta_flags & IEEE80211_STA_DISABLE_160MHZ &&
163 new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
164 ieee80211_chandef_downgrade(&new_vht_chandef);
165 if (sta_flags & IEEE80211_STA_DISABLE_40MHZ &&
166 new_vht_chandef.width > NL80211_CHAN_WIDTH_20)
167 ieee80211_chandef_downgrade(&new_vht_chandef);
168 }
169
170
171 if (new_vht_chandef.chan) {
172 if (!cfg80211_chandef_compatible(&new_vht_chandef,
173 &csa_ie->chandef)) {
174 sdata_info(sdata,
175 "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
176 bssid);
177 return -EINVAL;
178 }
179 csa_ie->chandef = new_vht_chandef;
180 }
181
182 return 0;
183}
184
185static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
186 struct ieee80211_msrment_ie *request_ie,
187 const u8 *da, const u8 *bssid,
188 u8 dialog_token)
189{
190 struct ieee80211_local *local = sdata->local;
191 struct sk_buff *skb;
192 struct ieee80211_mgmt *msr_report;
193
194 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
195 sizeof(struct ieee80211_msrment_ie));
196 if (!skb)
197 return;
198
199 skb_reserve(skb, local->hw.extra_tx_headroom);
200 msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
201 memset(msr_report, 0, 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
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236
237
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}
244
