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
ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,enum nl80211_band current_band,u32 sta_flags,u8 * bssid,struct ieee80211_csa_ie * csa_ie)22 int 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 u8 new_seg1 = wide_bw_chansw_ie->new_center_freq_seg1;
136 struct ieee80211_vht_operation vht_oper = {
137 .chan_width =
138 wide_bw_chansw_ie->new_channel_width,
139 .center_freq_seg0_idx =
140 wide_bw_chansw_ie->new_center_freq_seg0,
141 .center_freq_seg1_idx = new_seg1,
142 /* .basic_mcs_set doesn't matter */
143 };
144 struct ieee80211_ht_operation ht_oper = {
145 .operation_mode =
146 cpu_to_le16(new_seg1 <<
147 IEEE80211_HT_OP_MODE_CCFS2_SHIFT),
148 };
149
150 /* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT,
151 * to the previously parsed chandef
152 */
153 new_vht_chandef = csa_ie->chandef;
154
155 /* ignore if parsing fails */
156 if (!ieee80211_chandef_vht_oper(&sdata->local->hw,
157 &vht_oper, &ht_oper,
158 &new_vht_chandef))
159 new_vht_chandef.chan = NULL;
160
161 if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
162 new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
163 ieee80211_chandef_downgrade(&new_vht_chandef);
164 if (sta_flags & IEEE80211_STA_DISABLE_160MHZ &&
165 new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
166 ieee80211_chandef_downgrade(&new_vht_chandef);
167 }
168
169 /* if VHT data is there validate & use it */
170 if (new_vht_chandef.chan) {
171 if (!cfg80211_chandef_compatible(&new_vht_chandef,
172 &csa_ie->chandef)) {
173 sdata_info(sdata,
174 "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
175 bssid);
176 return -EINVAL;
177 }
178 csa_ie->chandef = new_vht_chandef;
179 }
180
181 if (elems->max_channel_switch_time)
182 csa_ie->max_switch_time =
183 (elems->max_channel_switch_time[0] << 0) |
184 (elems->max_channel_switch_time[1] << 8) |
185 (elems->max_channel_switch_time[2] << 16);
186
187 return 0;
188 }
189
ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data * sdata,struct ieee80211_msrment_ie * request_ie,const u8 * da,const u8 * bssid,u8 dialog_token)190 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
191 struct ieee80211_msrment_ie *request_ie,
192 const u8 *da, const u8 *bssid,
193 u8 dialog_token)
194 {
195 struct ieee80211_local *local = sdata->local;
196 struct sk_buff *skb;
197 struct ieee80211_mgmt *msr_report;
198
199 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
200 sizeof(struct ieee80211_msrment_ie));
201 if (!skb)
202 return;
203
204 skb_reserve(skb, local->hw.extra_tx_headroom);
205 msr_report = skb_put_zero(skb, 24);
206 memcpy(msr_report->da, da, ETH_ALEN);
207 memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
208 memcpy(msr_report->bssid, bssid, ETH_ALEN);
209 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
210 IEEE80211_STYPE_ACTION);
211
212 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
213 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
214 msr_report->u.action.u.measurement.action_code =
215 WLAN_ACTION_SPCT_MSR_RPRT;
216 msr_report->u.action.u.measurement.dialog_token = dialog_token;
217
218 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
219 msr_report->u.action.u.measurement.length =
220 sizeof(struct ieee80211_msrment_ie);
221
222 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
223 sizeof(struct ieee80211_msrment_ie));
224 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
225 msr_report->u.action.u.measurement.msr_elem.mode |=
226 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
227 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
228
229 ieee80211_tx_skb(sdata, skb);
230 }
231
ieee80211_process_measurement_req(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)232 void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
233 struct ieee80211_mgmt *mgmt,
234 size_t len)
235 {
236 /*
237 * Ignoring measurement request is spec violation.
238 * Mandatory measurements must be reported optional
239 * measurements might be refused or reported incapable
240 * For now just refuse
241 * TODO: Answer basic measurement as unmeasured
242 */
243 ieee80211_send_refuse_measurement_request(sdata,
244 &mgmt->u.action.u.measurement.msr_elem,
245 mgmt->sa, mgmt->bssid,
246 mgmt->u.action.u.measurement.dialog_token);
247 }
248