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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 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 memset(csa_ie, 0, sizeof(*csa_ie));
40
41 sec_chan_offs = elems->sec_chan_offs;
42 wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
43
44 if (sta_flags & (IEEE80211_STA_DISABLE_HT |
45 IEEE80211_STA_DISABLE_40MHZ)) {
46 sec_chan_offs = NULL;
47 wide_bw_chansw_ie = NULL;
48 }
49
50 if (sta_flags & IEEE80211_STA_DISABLE_VHT)
51 wide_bw_chansw_ie = NULL;
52
53 if (elems->ext_chansw_ie) {
54 if (!ieee80211_operating_class_to_band(
55 elems->ext_chansw_ie->new_operating_class,
56 &new_band)) {
57 sdata_info(sdata,
58 "cannot understand ECSA IE operating class %d, disconnecting\n",
59 elems->ext_chansw_ie->new_operating_class);
60 return -EINVAL;
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_band = current_band;
67 new_chan_no = elems->ch_switch_ie->new_ch_num;
68 csa_ie->count = elems->ch_switch_ie->count;
69 csa_ie->mode = elems->ch_switch_ie->mode;
70 } else {
71
72 return 1;
73 }
74
75
76 if (elems->mesh_chansw_params_ie) {
77 csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
78 csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags;
79 csa_ie->pre_value = le16_to_cpu(
80 elems->mesh_chansw_params_ie->mesh_pre_value);
81
82 if (elems->mesh_chansw_params_ie->mesh_flags &
83 WLAN_EID_CHAN_SWITCH_PARAM_REASON)
84 csa_ie->reason_code = le16_to_cpu(
85 elems->mesh_chansw_params_ie->mesh_reason);
86 }
87
88 new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
89 new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
90 if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
91 sdata_info(sdata,
92 "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
93 bssid, new_freq);
94 return -EINVAL;
95 }
96
97 if (sec_chan_offs) {
98 secondary_channel_offset = sec_chan_offs->sec_chan_offs;
99 } else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) {
100
101
102
103
104 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
105 }
106
107 switch (secondary_channel_offset) {
108 default:
109
110 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
111 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
112 NL80211_CHAN_HT20);
113 break;
114 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
115 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
116 NL80211_CHAN_HT40PLUS);
117 break;
118 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
119 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
120 NL80211_CHAN_HT40MINUS);
121 break;
122 case -1:
123 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
124 NL80211_CHAN_NO_HT);
125
126 switch (sdata->vif.bss_conf.chandef.width) {
127 case NL80211_CHAN_WIDTH_5:
128 case NL80211_CHAN_WIDTH_10:
129 csa_ie->chandef.width =
130 sdata->vif.bss_conf.chandef.width;
131 break;
132 default:
133 break;
134 }
135 break;
136 }
137
138 if (wide_bw_chansw_ie) {
139 struct ieee80211_vht_operation vht_oper = {
140 .chan_width =
141 wide_bw_chansw_ie->new_channel_width,
142 .center_freq_seg0_idx =
143 wide_bw_chansw_ie->new_center_freq_seg0,
144 .center_freq_seg1_idx =
145 wide_bw_chansw_ie->new_center_freq_seg1,
146
147 };
148
149
150
151
152 new_vht_chandef = csa_ie->chandef;
153
154
155 if (!ieee80211_chandef_vht_oper(&vht_oper, &new_vht_chandef))
156 new_vht_chandef.chan = NULL;
157
158 if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
159 new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
160 ieee80211_chandef_downgrade(&new_vht_chandef);
161 if (sta_flags & IEEE80211_STA_DISABLE_160MHZ &&
162 new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
163 ieee80211_chandef_downgrade(&new_vht_chandef);
164 }
165
166
167 if (new_vht_chandef.chan) {
168 if (!cfg80211_chandef_compatible(&new_vht_chandef,
169 &csa_ie->chandef)) {
170 sdata_info(sdata,
171 "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
172 bssid);
173 return -EINVAL;
174 }
175 csa_ie->chandef = new_vht_chandef;
176 }
177
178 return 0;
179}
180
181static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
182 struct ieee80211_msrment_ie *request_ie,
183 const u8 *da, const u8 *bssid,
184 u8 dialog_token)
185{
186 struct ieee80211_local *local = sdata->local;
187 struct sk_buff *skb;
188 struct ieee80211_mgmt *msr_report;
189
190 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
191 sizeof(struct ieee80211_msrment_ie));
192 if (!skb)
193 return;
194
195 skb_reserve(skb, local->hw.extra_tx_headroom);
196 msr_report = skb_put_zero(skb, 24);
197 memcpy(msr_report->da, da, ETH_ALEN);
198 memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
199 memcpy(msr_report->bssid, bssid, ETH_ALEN);
200 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
201 IEEE80211_STYPE_ACTION);
202
203 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
204 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
205 msr_report->u.action.u.measurement.action_code =
206 WLAN_ACTION_SPCT_MSR_RPRT;
207 msr_report->u.action.u.measurement.dialog_token = dialog_token;
208
209 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
210 msr_report->u.action.u.measurement.length =
211 sizeof(struct ieee80211_msrment_ie);
212
213 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
214 sizeof(struct ieee80211_msrment_ie));
215 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
216 msr_report->u.action.u.measurement.msr_elem.mode |=
217 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
218 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
219
220 ieee80211_tx_skb(sdata, skb);
221}
222
223void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
224 struct ieee80211_mgmt *mgmt,
225 size_t len)
226{
227
228
229
230
231
232
233
234 ieee80211_send_refuse_measurement_request(sdata,
235 &mgmt->u.action.u.measurement.msr_elem,
236 mgmt->sa, mgmt->bssid,
237 mgmt->u.action.u.measurement.dialog_token);
238}
239