]>
Commit | Line | Data |
---|---|---|
39192c0b JB |
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> | |
d3236553 | 18 | #include <net/cfg80211.h> |
39192c0b JB |
19 | #include <net/mac80211.h> |
20 | #include "ieee80211_i.h" | |
21 | #include "sta_info.h" | |
22 | #include "wme.h" | |
23 | ||
e6b7cde4 SW |
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, | |
c0f17eb9 CYY |
27 | u32 sta_flags, u8 *bssid, |
28 | struct ieee80211_csa_ie *csa_ie) | |
e6b7cde4 SW |
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; | |
c0f17eb9 CYY |
65 | csa_ie->count = elems->ext_chansw_ie->count; |
66 | csa_ie->mode = elems->ext_chansw_ie->mode; | |
e6b7cde4 SW |
67 | } else if (elems->ch_switch_ie) { |
68 | new_band = current_band; | |
69 | new_chan_no = elems->ch_switch_ie->new_ch_num; | |
c0f17eb9 CYY |
70 | csa_ie->count = elems->ch_switch_ie->count; |
71 | csa_ie->mode = elems->ch_switch_ie->mode; | |
e6b7cde4 SW |
72 | } else { |
73 | /* nothing here we understand */ | |
74 | return 1; | |
75 | } | |
76 | ||
33a45867 CYY |
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 | } | |
82 | ||
e6b7cde4 SW |
83 | new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band); |
84 | new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); | |
85 | if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) { | |
86 | sdata_info(sdata, | |
87 | "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n", | |
88 | bssid, new_freq); | |
89 | return -EINVAL; | |
90 | } | |
91 | ||
92 | if (!beacon && sec_chan_offs) { | |
93 | secondary_channel_offset = sec_chan_offs->sec_chan_offs; | |
94 | } else if (beacon && ht_oper) { | |
95 | secondary_channel_offset = | |
96 | ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET; | |
97 | } else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) { | |
98 | /* If it's not a beacon, HT is enabled and the IE not present, | |
99 | * it's 20 MHz, 802.11-2012 8.5.2.6: | |
100 | * This element [the Secondary Channel Offset Element] is | |
101 | * present when switching to a 40 MHz channel. It may be | |
102 | * present when switching to a 20 MHz channel (in which | |
103 | * case the secondary channel offset is set to SCN). | |
104 | */ | |
105 | secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE; | |
106 | } | |
107 | ||
108 | switch (secondary_channel_offset) { | |
109 | default: | |
110 | /* secondary_channel_offset was present but is invalid */ | |
111 | case IEEE80211_HT_PARAM_CHA_SEC_NONE: | |
c0f17eb9 | 112 | cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
e6b7cde4 SW |
113 | NL80211_CHAN_HT20); |
114 | break; | |
115 | case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: | |
c0f17eb9 | 116 | cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
e6b7cde4 SW |
117 | NL80211_CHAN_HT40PLUS); |
118 | break; | |
119 | case IEEE80211_HT_PARAM_CHA_SEC_BELOW: | |
c0f17eb9 | 120 | cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
e6b7cde4 SW |
121 | NL80211_CHAN_HT40MINUS); |
122 | break; | |
123 | case -1: | |
c0f17eb9 | 124 | cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
e6b7cde4 SW |
125 | NL80211_CHAN_NO_HT); |
126 | /* keep width for 5/10 MHz channels */ | |
127 | switch (sdata->vif.bss_conf.chandef.width) { | |
128 | case NL80211_CHAN_WIDTH_5: | |
129 | case NL80211_CHAN_WIDTH_10: | |
c0f17eb9 CYY |
130 | csa_ie->chandef.width = |
131 | sdata->vif.bss_conf.chandef.width; | |
e6b7cde4 SW |
132 | break; |
133 | default: | |
134 | break; | |
135 | } | |
136 | break; | |
137 | } | |
138 | ||
139 | if (wide_bw_chansw_ie) { | |
140 | new_vht_chandef.chan = new_chan; | |
141 | new_vht_chandef.center_freq1 = | |
142 | ieee80211_channel_to_frequency( | |
143 | wide_bw_chansw_ie->new_center_freq_seg0, | |
144 | new_band); | |
145 | ||
146 | switch (wide_bw_chansw_ie->new_channel_width) { | |
147 | default: | |
148 | /* hmmm, ignore VHT and use HT if present */ | |
149 | case IEEE80211_VHT_CHANWIDTH_USE_HT: | |
150 | new_vht_chandef.chan = NULL; | |
151 | break; | |
152 | case IEEE80211_VHT_CHANWIDTH_80MHZ: | |
153 | new_vht_chandef.width = NL80211_CHAN_WIDTH_80; | |
154 | break; | |
155 | case IEEE80211_VHT_CHANWIDTH_160MHZ: | |
156 | new_vht_chandef.width = NL80211_CHAN_WIDTH_160; | |
157 | break; | |
158 | case IEEE80211_VHT_CHANWIDTH_80P80MHZ: | |
159 | /* field is otherwise reserved */ | |
160 | new_vht_chandef.center_freq2 = | |
161 | ieee80211_channel_to_frequency( | |
162 | wide_bw_chansw_ie->new_center_freq_seg1, | |
163 | new_band); | |
164 | new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80; | |
165 | break; | |
166 | } | |
167 | if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ && | |
168 | new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80) | |
169 | ieee80211_chandef_downgrade(&new_vht_chandef); | |
170 | if (sta_flags & IEEE80211_STA_DISABLE_160MHZ && | |
171 | new_vht_chandef.width == NL80211_CHAN_WIDTH_160) | |
172 | ieee80211_chandef_downgrade(&new_vht_chandef); | |
173 | if (sta_flags & IEEE80211_STA_DISABLE_40MHZ && | |
174 | new_vht_chandef.width > NL80211_CHAN_WIDTH_20) | |
175 | ieee80211_chandef_downgrade(&new_vht_chandef); | |
176 | } | |
177 | ||
178 | /* if VHT data is there validate & use it */ | |
179 | if (new_vht_chandef.chan) { | |
180 | if (!cfg80211_chandef_compatible(&new_vht_chandef, | |
c0f17eb9 | 181 | &csa_ie->chandef)) { |
e6b7cde4 SW |
182 | sdata_info(sdata, |
183 | "BSS %pM: CSA has inconsistent channel data, disconnecting\n", | |
184 | bssid); | |
185 | return -EINVAL; | |
186 | } | |
c0f17eb9 | 187 | csa_ie->chandef = new_vht_chandef; |
e6b7cde4 SW |
188 | } |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
39192c0b JB |
193 | static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata, |
194 | struct ieee80211_msrment_ie *request_ie, | |
195 | const u8 *da, const u8 *bssid, | |
196 | u8 dialog_token) | |
197 | { | |
198 | struct ieee80211_local *local = sdata->local; | |
199 | struct sk_buff *skb; | |
200 | struct ieee80211_mgmt *msr_report; | |
201 | ||
202 | skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom + | |
203 | sizeof(struct ieee80211_msrment_ie)); | |
d15b8459 | 204 | if (!skb) |
39192c0b | 205 | return; |
39192c0b JB |
206 | |
207 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
208 | msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24); | |
209 | memset(msr_report, 0, 24); | |
210 | memcpy(msr_report->da, da, ETH_ALEN); | |
47846c9b | 211 | memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN); |
39192c0b JB |
212 | memcpy(msr_report->bssid, bssid, ETH_ALEN); |
213 | msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
214 | IEEE80211_STYPE_ACTION); | |
215 | ||
216 | skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement)); | |
217 | msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT; | |
218 | msr_report->u.action.u.measurement.action_code = | |
219 | WLAN_ACTION_SPCT_MSR_RPRT; | |
220 | msr_report->u.action.u.measurement.dialog_token = dialog_token; | |
221 | ||
222 | msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT; | |
223 | msr_report->u.action.u.measurement.length = | |
224 | sizeof(struct ieee80211_msrment_ie); | |
225 | ||
226 | memset(&msr_report->u.action.u.measurement.msr_elem, 0, | |
227 | sizeof(struct ieee80211_msrment_ie)); | |
228 | msr_report->u.action.u.measurement.msr_elem.token = request_ie->token; | |
229 | msr_report->u.action.u.measurement.msr_elem.mode |= | |
230 | IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED; | |
231 | msr_report->u.action.u.measurement.msr_elem.type = request_ie->type; | |
232 | ||
62ae67be | 233 | ieee80211_tx_skb(sdata, skb); |
39192c0b JB |
234 | } |
235 | ||
236 | void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata, | |
237 | struct ieee80211_mgmt *mgmt, | |
238 | size_t len) | |
239 | { | |
240 | /* | |
241 | * Ignoring measurement request is spec violation. | |
242 | * Mandatory measurements must be reported optional | |
243 | * measurements might be refused or reported incapable | |
244 | * For now just refuse | |
245 | * TODO: Answer basic measurement as unmeasured | |
246 | */ | |
247 | ieee80211_send_refuse_measurement_request(sdata, | |
248 | &mgmt->u.action.u.measurement.msr_elem, | |
249 | mgmt->sa, mgmt->bssid, | |
250 | mgmt->u.action.u.measurement.dialog_token); | |
251 | } |