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1 | /* |
2 | * spectrum management |
3 | * |
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 | * |
12 | * This program is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU General Public License version 2 as |
14 | * published by the Free Software Foundation. |
15 | */ |
16 | |
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 | |
24 | int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata, |
25 | struct ieee802_11_elems *elems, bool beacon, |
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 | const struct ieee80211_ht_operation *ht_oper; |
38 | int secondary_channel_offset = -1; |
39 | |
40 | sec_chan_offs = elems->sec_chan_offs; |
41 | wide_bw_chansw_ie = elems->wide_bw_chansw_ie; |
42 | ht_oper = elems->ht_operation; |
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 | /* only used for bandwidth here */ |
49 | ht_oper = NULL; |
50 | } |
51 | |
52 | if (sta_flags & IEEE80211_STA_DISABLE_VHT) |
53 | wide_bw_chansw_ie = NULL; |
54 | |
55 | if (elems->ext_chansw_ie) { |
56 | if (!ieee80211_operating_class_to_band( |
57 | elems->ext_chansw_ie->new_operating_class, |
58 | &new_band)) { |
59 | sdata_info(sdata, |
60 | "cannot understand ECSA IE operating class %d, disconnecting\n", |
61 | elems->ext_chansw_ie->new_operating_class); |
62 | return -EINVAL; |
63 | } |
64 | new_chan_no = elems->ext_chansw_ie->new_ch_num; |
65 | csa_ie->count = elems->ext_chansw_ie->count; |
66 | csa_ie->mode = elems->ext_chansw_ie->mode; |
67 | } else if (elems->ch_switch_ie) { |
68 | new_band = current_band; |
69 | new_chan_no = elems->ch_switch_ie->new_ch_num; |
70 | csa_ie->count = elems->ch_switch_ie->count; |
71 | csa_ie->mode = elems->ch_switch_ie->mode; |
72 | } else { |
73 | /* nothing here we understand */ |
74 | return 1; |
75 | } |
76 | |
77 | /* Mesh Channel Switch Parameters Element */ |
78 | if (elems->mesh_chansw_params_ie) { |
79 | csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl; |
80 | csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags; |
81 | csa_ie->pre_value = le16_to_cpu( |
82 | elems->mesh_chansw_params_ie->mesh_pre_value); |
83 | } |
84 | |
85 | new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band); |
86 | new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); |
87 | if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) { |
88 | sdata_info(sdata, |
89 | "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n", |
90 | bssid, new_freq); |
91 | return -EINVAL; |
92 | } |
93 | |
94 | if (!beacon && sec_chan_offs) { |
95 | secondary_channel_offset = sec_chan_offs->sec_chan_offs; |
96 | } else if (beacon && ht_oper) { |
97 | secondary_channel_offset = |
98 | ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET; |
99 | } else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) { |
100 | /* If it's not a beacon, HT is enabled and the IE not present, |
101 | * it's 20 MHz, 802.11-2012 8.5.2.6: |
102 | * This element [the Secondary Channel Offset Element] is |
103 | * present when switching to a 40 MHz channel. It may be |
104 | * present when switching to a 20 MHz channel (in which |
105 | * case the secondary channel offset is set to SCN). |
106 | */ |
107 | secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE; |
108 | } |
109 | |
110 | switch (secondary_channel_offset) { |
111 | default: |
112 | /* secondary_channel_offset was present but is invalid */ |
113 | case IEEE80211_HT_PARAM_CHA_SEC_NONE: |
114 | cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
115 | NL80211_CHAN_HT20); |
116 | break; |
117 | case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: |
118 | cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
119 | NL80211_CHAN_HT40PLUS); |
120 | break; |
121 | case IEEE80211_HT_PARAM_CHA_SEC_BELOW: |
122 | cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
123 | NL80211_CHAN_HT40MINUS); |
124 | break; |
125 | case -1: |
126 | cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
127 | NL80211_CHAN_NO_HT); |
128 | /* keep width for 5/10 MHz channels */ |
129 | switch (sdata->vif.bss_conf.chandef.width) { |
130 | case NL80211_CHAN_WIDTH_5: |
131 | case NL80211_CHAN_WIDTH_10: |
132 | csa_ie->chandef.width = |
133 | sdata->vif.bss_conf.chandef.width; |
134 | break; |
135 | default: |
136 | break; |
137 | } |
138 | break; |
139 | } |
140 | |
141 | if (wide_bw_chansw_ie) { |
142 | new_vht_chandef.chan = new_chan; |
143 | new_vht_chandef.center_freq1 = |
144 | ieee80211_channel_to_frequency( |
145 | wide_bw_chansw_ie->new_center_freq_seg0, |
146 | new_band); |
147 | |
148 | switch (wide_bw_chansw_ie->new_channel_width) { |
149 | default: |
150 | /* hmmm, ignore VHT and use HT if present */ |
151 | case IEEE80211_VHT_CHANWIDTH_USE_HT: |
152 | new_vht_chandef.chan = NULL; |
153 | break; |
154 | case IEEE80211_VHT_CHANWIDTH_80MHZ: |
155 | new_vht_chandef.width = NL80211_CHAN_WIDTH_80; |
156 | break; |
157 | case IEEE80211_VHT_CHANWIDTH_160MHZ: |
158 | new_vht_chandef.width = NL80211_CHAN_WIDTH_160; |
159 | break; |
160 | case IEEE80211_VHT_CHANWIDTH_80P80MHZ: |
161 | /* field is otherwise reserved */ |
162 | new_vht_chandef.center_freq2 = |
163 | ieee80211_channel_to_frequency( |
164 | wide_bw_chansw_ie->new_center_freq_seg1, |
165 | new_band); |
166 | new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80; |
167 | break; |
168 | } |
169 | if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ && |
170 | new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80) |
171 | ieee80211_chandef_downgrade(&new_vht_chandef); |
172 | if (sta_flags & IEEE80211_STA_DISABLE_160MHZ && |
173 | new_vht_chandef.width == NL80211_CHAN_WIDTH_160) |
174 | ieee80211_chandef_downgrade(&new_vht_chandef); |
175 | if (sta_flags & IEEE80211_STA_DISABLE_40MHZ && |
176 | new_vht_chandef.width > NL80211_CHAN_WIDTH_20) |
177 | ieee80211_chandef_downgrade(&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(&new_vht_chandef, |
183 | &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 | return 0; |
193 | } |
194 | |
195 | static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata, |
196 | struct ieee80211_msrment_ie *request_ie, |
197 | const u8 *da, const u8 *bssid, |
198 | u8 dialog_token) |
199 | { |
200 | struct ieee80211_local *local = sdata->local; |
201 | struct sk_buff *skb; |
202 | struct ieee80211_mgmt *msr_report; |
203 | |
204 | skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom + |
205 | sizeof(struct ieee80211_msrment_ie)); |
206 | if (!skb) |
207 | return; |
208 | |
209 | skb_reserve(skb, local->hw.extra_tx_headroom); |
210 | msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24); |
211 | memset(msr_report, 0, 24); |
212 | memcpy(msr_report->da, da, ETH_ALEN); |
213 | memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN); |
214 | memcpy(msr_report->bssid, bssid, ETH_ALEN); |
215 | msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
216 | IEEE80211_STYPE_ACTION); |
217 | |
218 | skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement)); |
219 | msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT; |
220 | msr_report->u.action.u.measurement.action_code = |
221 | WLAN_ACTION_SPCT_MSR_RPRT; |
222 | msr_report->u.action.u.measurement.dialog_token = dialog_token; |
223 | |
224 | msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT; |
225 | msr_report->u.action.u.measurement.length = |
226 | sizeof(struct ieee80211_msrment_ie); |
227 | |
228 | memset(&msr_report->u.action.u.measurement.msr_elem, 0, |
229 | sizeof(struct ieee80211_msrment_ie)); |
230 | msr_report->u.action.u.measurement.msr_elem.token = request_ie->token; |
231 | msr_report->u.action.u.measurement.msr_elem.mode |= |
232 | IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED; |
233 | msr_report->u.action.u.measurement.msr_elem.type = request_ie->type; |
234 | |
235 | ieee80211_tx_skb(sdata, skb); |
236 | } |
237 | |
238 | void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata, |
239 | struct ieee80211_mgmt *mgmt, |
240 | size_t len) |
241 | { |
242 | /* |
243 | * Ignoring measurement request is spec violation. |
244 | * Mandatory measurements must be reported optional |
245 | * measurements might be refused or reported incapable |
246 | * For now just refuse |
247 | * TODO: Answer basic measurement as unmeasured |
248 | */ |
249 | ieee80211_send_refuse_measurement_request(sdata, |
250 | &mgmt->u.action.u.measurement.msr_elem, |
251 | mgmt->sa, mgmt->bssid, |
252 | mgmt->u.action.u.measurement.dialog_token); |
253 | } |
254 |
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