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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 | 24 | int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata, |
84469a45 | 25 | struct ieee802_11_elems *elems, |
57fbcce3 | 26 | enum nl80211_band current_band, |
c0f17eb9 CYY |
27 | u32 sta_flags, u8 *bssid, |
28 | struct ieee80211_csa_ie *csa_ie) | |
e6b7cde4 | 29 | { |
57fbcce3 | 30 | enum nl80211_band new_band; |
e6b7cde4 SW |
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; | |
e6b7cde4 SW |
37 | int secondary_channel_offset = -1; |
38 | ||
39 | sec_chan_offs = elems->sec_chan_offs; | |
40 | wide_bw_chansw_ie = elems->wide_bw_chansw_ie; | |
e6b7cde4 SW |
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; | |
e6b7cde4 SW |
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, disconnecting\n", | |
57 | elems->ext_chansw_ie->new_operating_class); | |
58 | return -EINVAL; | |
59 | } | |
60 | new_chan_no = elems->ext_chansw_ie->new_ch_num; | |
c0f17eb9 CYY |
61 | csa_ie->count = elems->ext_chansw_ie->count; |
62 | csa_ie->mode = elems->ext_chansw_ie->mode; | |
e6b7cde4 SW |
63 | } else if (elems->ch_switch_ie) { |
64 | new_band = current_band; | |
65 | new_chan_no = elems->ch_switch_ie->new_ch_num; | |
c0f17eb9 CYY |
66 | csa_ie->count = elems->ch_switch_ie->count; |
67 | csa_ie->mode = elems->ch_switch_ie->mode; | |
e6b7cde4 SW |
68 | } else { |
69 | /* nothing here we understand */ | |
70 | return 1; | |
71 | } | |
72 | ||
33a45867 CYY |
73 | /* Mesh Channel Switch Parameters Element */ |
74 | if (elems->mesh_chansw_params_ie) { | |
75 | csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl; | |
76 | csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags; | |
3f718fd8 CYY |
77 | csa_ie->pre_value = le16_to_cpu( |
78 | elems->mesh_chansw_params_ie->mesh_pre_value); | |
33a45867 CYY |
79 | } |
80 | ||
e6b7cde4 SW |
81 | new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band); |
82 | new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); | |
83 | if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) { | |
84 | sdata_info(sdata, | |
85 | "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n", | |
86 | bssid, new_freq); | |
87 | return -EINVAL; | |
88 | } | |
89 | ||
84469a45 | 90 | if (sec_chan_offs) { |
e6b7cde4 | 91 | secondary_channel_offset = sec_chan_offs->sec_chan_offs; |
e6b7cde4 | 92 | } else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) { |
84469a45 LC |
93 | /* If the secondary channel offset IE is not present, |
94 | * we can't know what's the post-CSA offset, so the | |
95 | * best we can do is use 20MHz. | |
96 | */ | |
e6b7cde4 SW |
97 | secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE; |
98 | } | |
99 | ||
100 | switch (secondary_channel_offset) { | |
101 | default: | |
102 | /* secondary_channel_offset was present but is invalid */ | |
103 | case IEEE80211_HT_PARAM_CHA_SEC_NONE: | |
c0f17eb9 | 104 | cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
e6b7cde4 SW |
105 | NL80211_CHAN_HT20); |
106 | break; | |
107 | case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: | |
c0f17eb9 | 108 | cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
e6b7cde4 SW |
109 | NL80211_CHAN_HT40PLUS); |
110 | break; | |
111 | case IEEE80211_HT_PARAM_CHA_SEC_BELOW: | |
c0f17eb9 | 112 | cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
e6b7cde4 SW |
113 | NL80211_CHAN_HT40MINUS); |
114 | break; | |
115 | case -1: | |
c0f17eb9 | 116 | cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
e6b7cde4 SW |
117 | NL80211_CHAN_NO_HT); |
118 | /* keep width for 5/10 MHz channels */ | |
119 | switch (sdata->vif.bss_conf.chandef.width) { | |
120 | case NL80211_CHAN_WIDTH_5: | |
121 | case NL80211_CHAN_WIDTH_10: | |
c0f17eb9 CYY |
122 | csa_ie->chandef.width = |
123 | sdata->vif.bss_conf.chandef.width; | |
e6b7cde4 SW |
124 | break; |
125 | default: | |
126 | break; | |
127 | } | |
128 | break; | |
129 | } | |
130 | ||
131 | if (wide_bw_chansw_ie) { | |
92b3a28a JB |
132 | struct ieee80211_vht_operation vht_oper = { |
133 | .chan_width = | |
134 | wide_bw_chansw_ie->new_channel_width, | |
135 | .center_freq_seg1_idx = | |
e6b7cde4 | 136 | wide_bw_chansw_ie->new_center_freq_seg0, |
92b3a28a JB |
137 | .center_freq_seg2_idx = |
138 | wide_bw_chansw_ie->new_center_freq_seg1, | |
139 | /* .basic_mcs_set doesn't matter */ | |
140 | }; | |
e6b7cde4 | 141 | |
92b3a28a JB |
142 | /* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT, |
143 | * to the previously parsed chandef | |
144 | */ | |
145 | new_vht_chandef = csa_ie->chandef; | |
146 | ||
147 | /* ignore if parsing fails */ | |
148 | if (!ieee80211_chandef_vht_oper(&vht_oper, &new_vht_chandef)) | |
e6b7cde4 | 149 | new_vht_chandef.chan = NULL; |
92b3a28a | 150 | |
e6b7cde4 SW |
151 | if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ && |
152 | new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80) | |
153 | ieee80211_chandef_downgrade(&new_vht_chandef); | |
154 | if (sta_flags & IEEE80211_STA_DISABLE_160MHZ && | |
155 | new_vht_chandef.width == NL80211_CHAN_WIDTH_160) | |
156 | ieee80211_chandef_downgrade(&new_vht_chandef); | |
e6b7cde4 SW |
157 | } |
158 | ||
159 | /* if VHT data is there validate & use it */ | |
160 | if (new_vht_chandef.chan) { | |
161 | if (!cfg80211_chandef_compatible(&new_vht_chandef, | |
c0f17eb9 | 162 | &csa_ie->chandef)) { |
e6b7cde4 SW |
163 | sdata_info(sdata, |
164 | "BSS %pM: CSA has inconsistent channel data, disconnecting\n", | |
165 | bssid); | |
166 | return -EINVAL; | |
167 | } | |
c0f17eb9 | 168 | csa_ie->chandef = new_vht_chandef; |
e6b7cde4 SW |
169 | } |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
39192c0b JB |
174 | static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata, |
175 | struct ieee80211_msrment_ie *request_ie, | |
176 | const u8 *da, const u8 *bssid, | |
177 | u8 dialog_token) | |
178 | { | |
179 | struct ieee80211_local *local = sdata->local; | |
180 | struct sk_buff *skb; | |
181 | struct ieee80211_mgmt *msr_report; | |
182 | ||
183 | skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom + | |
184 | sizeof(struct ieee80211_msrment_ie)); | |
d15b8459 | 185 | if (!skb) |
39192c0b | 186 | return; |
39192c0b JB |
187 | |
188 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
189 | msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24); | |
190 | memset(msr_report, 0, 24); | |
191 | memcpy(msr_report->da, da, ETH_ALEN); | |
47846c9b | 192 | memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN); |
39192c0b JB |
193 | memcpy(msr_report->bssid, bssid, ETH_ALEN); |
194 | msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
195 | IEEE80211_STYPE_ACTION); | |
196 | ||
197 | skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement)); | |
198 | msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT; | |
199 | msr_report->u.action.u.measurement.action_code = | |
200 | WLAN_ACTION_SPCT_MSR_RPRT; | |
201 | msr_report->u.action.u.measurement.dialog_token = dialog_token; | |
202 | ||
203 | msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT; | |
204 | msr_report->u.action.u.measurement.length = | |
205 | sizeof(struct ieee80211_msrment_ie); | |
206 | ||
207 | memset(&msr_report->u.action.u.measurement.msr_elem, 0, | |
208 | sizeof(struct ieee80211_msrment_ie)); | |
209 | msr_report->u.action.u.measurement.msr_elem.token = request_ie->token; | |
210 | msr_report->u.action.u.measurement.msr_elem.mode |= | |
211 | IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED; | |
212 | msr_report->u.action.u.measurement.msr_elem.type = request_ie->type; | |
213 | ||
62ae67be | 214 | ieee80211_tx_skb(sdata, skb); |
39192c0b JB |
215 | } |
216 | ||
217 | void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata, | |
218 | struct ieee80211_mgmt *mgmt, | |
219 | size_t len) | |
220 | { | |
221 | /* | |
222 | * Ignoring measurement request is spec violation. | |
223 | * Mandatory measurements must be reported optional | |
224 | * measurements might be refused or reported incapable | |
225 | * For now just refuse | |
226 | * TODO: Answer basic measurement as unmeasured | |
227 | */ | |
228 | ieee80211_send_refuse_measurement_request(sdata, | |
229 | &mgmt->u.action.u.measurement.msr_elem, | |
230 | mgmt->sa, mgmt->bssid, | |
231 | mgmt->u.action.u.measurement.dialog_token); | |
232 | } |