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, 2022-2023 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 | |
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 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 | const struct ieee80211_bandwidth_indication *bwi; |
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 | bwi = elems->bandwidth_indication; |
44 | |
45 | if (conn_flags & (IEEE80211_CONN_DISABLE_HT | |
46 | IEEE80211_CONN_DISABLE_40MHZ)) { |
47 | sec_chan_offs = NULL; |
48 | wide_bw_chansw_ie = NULL; |
49 | } |
50 | |
51 | if (conn_flags & IEEE80211_CONN_DISABLE_VHT) |
52 | wide_bw_chansw_ie = NULL; |
53 | |
54 | if (elems->ext_chansw_ie) { |
55 | if (!ieee80211_operating_class_to_band( |
56 | operating_class: elems->ext_chansw_ie->new_operating_class, |
57 | band: &new_band)) { |
58 | sdata_info(sdata, |
59 | "cannot understand ECSA IE operating class, %d, ignoring\n" , |
60 | elems->ext_chansw_ie->new_operating_class); |
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_chan_no = elems->ch_switch_ie->new_ch_num; |
67 | csa_ie->count = elems->ch_switch_ie->count; |
68 | csa_ie->mode = elems->ch_switch_ie->mode; |
69 | } else { |
70 | /* nothing here we understand */ |
71 | return 1; |
72 | } |
73 | |
74 | /* Mesh Channel Switch Parameters Element */ |
75 | if (elems->mesh_chansw_params_ie) { |
76 | csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl; |
77 | csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags; |
78 | csa_ie->pre_value = le16_to_cpu( |
79 | elems->mesh_chansw_params_ie->mesh_pre_value); |
80 | |
81 | if (elems->mesh_chansw_params_ie->mesh_flags & |
82 | WLAN_EID_CHAN_SWITCH_PARAM_REASON) |
83 | csa_ie->reason_code = le16_to_cpu( |
84 | elems->mesh_chansw_params_ie->mesh_reason); |
85 | } |
86 | |
87 | new_freq = ieee80211_channel_to_frequency(chan: new_chan_no, band: new_band); |
88 | new_chan = ieee80211_get_channel(wiphy: sdata->local->hw.wiphy, freq: new_freq); |
89 | if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) { |
90 | sdata_info(sdata, |
91 | "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n" , |
92 | bssid, new_freq); |
93 | return -EINVAL; |
94 | } |
95 | |
96 | if (sec_chan_offs) { |
97 | secondary_channel_offset = sec_chan_offs->sec_chan_offs; |
98 | } else if (!(conn_flags & IEEE80211_CONN_DISABLE_HT)) { |
99 | /* If the secondary channel offset IE is not present, |
100 | * we can't know what's the post-CSA offset, so the |
101 | * best we can do is use 20MHz. |
102 | */ |
103 | secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE; |
104 | } |
105 | |
106 | switch (secondary_channel_offset) { |
107 | default: |
108 | /* secondary_channel_offset was present but is invalid */ |
109 | case IEEE80211_HT_PARAM_CHA_SEC_NONE: |
110 | cfg80211_chandef_create(chandef: &csa_ie->chandef, channel: new_chan, |
111 | chantype: NL80211_CHAN_HT20); |
112 | break; |
113 | case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: |
114 | cfg80211_chandef_create(chandef: &csa_ie->chandef, channel: new_chan, |
115 | chantype: NL80211_CHAN_HT40PLUS); |
116 | break; |
117 | case IEEE80211_HT_PARAM_CHA_SEC_BELOW: |
118 | cfg80211_chandef_create(chandef: &csa_ie->chandef, channel: new_chan, |
119 | chantype: NL80211_CHAN_HT40MINUS); |
120 | break; |
121 | case -1: |
122 | cfg80211_chandef_create(chandef: &csa_ie->chandef, channel: new_chan, |
123 | chantype: NL80211_CHAN_NO_HT); |
124 | /* keep width for 5/10 MHz channels */ |
125 | switch (sdata->vif.bss_conf.chandef.width) { |
126 | case NL80211_CHAN_WIDTH_5: |
127 | case NL80211_CHAN_WIDTH_10: |
128 | csa_ie->chandef.width = |
129 | sdata->vif.bss_conf.chandef.width; |
130 | break; |
131 | default: |
132 | break; |
133 | } |
134 | break; |
135 | } |
136 | |
137 | if (bwi) { |
138 | /* start with the CSA one */ |
139 | new_vht_chandef = csa_ie->chandef; |
140 | /* and update the width accordingly */ |
141 | /* FIXME: support 160/320 */ |
142 | ieee80211_chandef_eht_oper(info: &bwi->info, support_160: true, support_320: true, |
143 | chandef: &new_vht_chandef); |
144 | } else if (wide_bw_chansw_ie) { |
145 | u8 new_seg1 = wide_bw_chansw_ie->new_center_freq_seg1; |
146 | struct ieee80211_vht_operation vht_oper = { |
147 | .chan_width = |
148 | wide_bw_chansw_ie->new_channel_width, |
149 | .center_freq_seg0_idx = |
150 | wide_bw_chansw_ie->new_center_freq_seg0, |
151 | .center_freq_seg1_idx = new_seg1, |
152 | /* .basic_mcs_set doesn't matter */ |
153 | }; |
154 | struct ieee80211_ht_operation ht_oper = { |
155 | .operation_mode = |
156 | cpu_to_le16(new_seg1 << |
157 | IEEE80211_HT_OP_MODE_CCFS2_SHIFT), |
158 | }; |
159 | |
160 | /* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT, |
161 | * to the previously parsed chandef |
162 | */ |
163 | new_vht_chandef = csa_ie->chandef; |
164 | |
165 | /* ignore if parsing fails */ |
166 | if (!ieee80211_chandef_vht_oper(hw: &sdata->local->hw, |
167 | vht_cap_info, |
168 | oper: &vht_oper, htop: &ht_oper, |
169 | chandef: &new_vht_chandef)) |
170 | new_vht_chandef.chan = NULL; |
171 | |
172 | if (conn_flags & IEEE80211_CONN_DISABLE_80P80MHZ && |
173 | new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80) |
174 | ieee80211_chandef_downgrade(c: &new_vht_chandef); |
175 | if (conn_flags & IEEE80211_CONN_DISABLE_160MHZ && |
176 | new_vht_chandef.width == NL80211_CHAN_WIDTH_160) |
177 | ieee80211_chandef_downgrade(c: &new_vht_chandef); |
178 | } |
179 | |
180 | /* if VHT data is there validate & use it */ |
181 | if (new_vht_chandef.chan) { |
182 | if (!cfg80211_chandef_compatible(chandef1: &new_vht_chandef, |
183 | chandef2: &csa_ie->chandef)) { |
184 | sdata_info(sdata, |
185 | "BSS %pM: CSA has inconsistent channel data, disconnecting\n" , |
186 | bssid); |
187 | return -EINVAL; |
188 | } |
189 | csa_ie->chandef = new_vht_chandef; |
190 | } |
191 | |
192 | if (elems->max_channel_switch_time) |
193 | csa_ie->max_switch_time = |
194 | (elems->max_channel_switch_time[0] << 0) | |
195 | (elems->max_channel_switch_time[1] << 8) | |
196 | (elems->max_channel_switch_time[2] << 16); |
197 | |
198 | return 0; |
199 | } |
200 | |
201 | static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata, |
202 | struct ieee80211_msrment_ie *request_ie, |
203 | const u8 *da, const u8 *bssid, |
204 | u8 dialog_token) |
205 | { |
206 | struct ieee80211_local *local = sdata->local; |
207 | struct sk_buff *skb; |
208 | struct ieee80211_mgmt *msr_report; |
209 | |
210 | skb = dev_alloc_skb(length: sizeof(*msr_report) + local->hw.extra_tx_headroom + |
211 | sizeof(struct ieee80211_msrment_ie)); |
212 | if (!skb) |
213 | return; |
214 | |
215 | skb_reserve(skb, len: local->hw.extra_tx_headroom); |
216 | msr_report = skb_put_zero(skb, len: 24); |
217 | memcpy(msr_report->da, da, ETH_ALEN); |
218 | memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN); |
219 | memcpy(msr_report->bssid, bssid, ETH_ALEN); |
220 | msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
221 | IEEE80211_STYPE_ACTION); |
222 | |
223 | skb_put(skb, len: 1 + sizeof(msr_report->u.action.u.measurement)); |
224 | msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT; |
225 | msr_report->u.action.u.measurement.action_code = |
226 | WLAN_ACTION_SPCT_MSR_RPRT; |
227 | msr_report->u.action.u.measurement.dialog_token = dialog_token; |
228 | |
229 | msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT; |
230 | msr_report->u.action.u.measurement.length = |
231 | sizeof(struct ieee80211_msrment_ie); |
232 | |
233 | memset(&msr_report->u.action.u.measurement.msr_elem, 0, |
234 | sizeof(struct ieee80211_msrment_ie)); |
235 | msr_report->u.action.u.measurement.msr_elem.token = request_ie->token; |
236 | msr_report->u.action.u.measurement.msr_elem.mode |= |
237 | IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED; |
238 | msr_report->u.action.u.measurement.msr_elem.type = request_ie->type; |
239 | |
240 | ieee80211_tx_skb(sdata, skb); |
241 | } |
242 | |
243 | void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata, |
244 | struct ieee80211_mgmt *mgmt, |
245 | size_t len) |
246 | { |
247 | /* |
248 | * Ignoring measurement request is spec violation. |
249 | * Mandatory measurements must be reported optional |
250 | * measurements might be refused or reported incapable |
251 | * For now just refuse |
252 | * TODO: Answer basic measurement as unmeasured |
253 | */ |
254 | ieee80211_send_refuse_measurement_request(sdata, |
255 | request_ie: &mgmt->u.action.u.measurement.msr_elem, |
256 | da: mgmt->sa, bssid: mgmt->bssid, |
257 | dialog_token: mgmt->u.action.u.measurement.dialog_token); |
258 | } |
259 | |