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Linux/net/mac80211/spectmgmt.c

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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,
 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         int secondary_channel_offset = -1;
 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, 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;
 61                 csa_ie->count = elems->ext_chansw_ie->count;
 62                 csa_ie->mode = elems->ext_chansw_ie->mode;
 63         } else if (elems->ch_switch_ie) {
 64                 new_band = current_band;
 65                 new_chan_no = elems->ch_switch_ie->new_ch_num;
 66                 csa_ie->count = elems->ch_switch_ie->count;
 67                 csa_ie->mode = elems->ch_switch_ie->mode;
 68         } else {
 69                 /* nothing here we understand */
 70                 return 1;
 71         }
 72 
 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;
 77                 csa_ie->pre_value = le16_to_cpu(
 78                                 elems->mesh_chansw_params_ie->mesh_pre_value);
 79         }
 80 
 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 
 90         if (sec_chan_offs) {
 91                 secondary_channel_offset = sec_chan_offs->sec_chan_offs;
 92         } else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) {
 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                 */
 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:
104                 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
105                                         NL80211_CHAN_HT20);
106                 break;
107         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
108                 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
109                                         NL80211_CHAN_HT40PLUS);
110                 break;
111         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
112                 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
113                                         NL80211_CHAN_HT40MINUS);
114                 break;
115         case -1:
116                 cfg80211_chandef_create(&csa_ie->chandef, new_chan,
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:
122                         csa_ie->chandef.width =
123                                 sdata->vif.bss_conf.chandef.width;
124                         break;
125                 default:
126                         break;
127                 }
128                 break;
129         }
130 
131         if (wide_bw_chansw_ie) {
132                 new_vht_chandef.chan = new_chan;
133                 new_vht_chandef.center_freq1 =
134                         ieee80211_channel_to_frequency(
135                                 wide_bw_chansw_ie->new_center_freq_seg0,
136                                 new_band);
137 
138                 switch (wide_bw_chansw_ie->new_channel_width) {
139                 default:
140                         /* hmmm, ignore VHT and use HT if present */
141                 case IEEE80211_VHT_CHANWIDTH_USE_HT:
142                         new_vht_chandef.chan = NULL;
143                         break;
144                 case IEEE80211_VHT_CHANWIDTH_80MHZ:
145                         new_vht_chandef.width = NL80211_CHAN_WIDTH_80;
146                         break;
147                 case IEEE80211_VHT_CHANWIDTH_160MHZ:
148                         new_vht_chandef.width = NL80211_CHAN_WIDTH_160;
149                         break;
150                 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
151                         /* field is otherwise reserved */
152                         new_vht_chandef.center_freq2 =
153                                 ieee80211_channel_to_frequency(
154                                         wide_bw_chansw_ie->new_center_freq_seg1,
155                                         new_band);
156                         new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
157                         break;
158                 }
159                 if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
160                     new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
161                         ieee80211_chandef_downgrade(&new_vht_chandef);
162                 if (sta_flags & IEEE80211_STA_DISABLE_160MHZ &&
163                     new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
164                         ieee80211_chandef_downgrade(&new_vht_chandef);
165                 if (sta_flags & IEEE80211_STA_DISABLE_40MHZ &&
166                     new_vht_chandef.width > NL80211_CHAN_WIDTH_20)
167                         ieee80211_chandef_downgrade(&new_vht_chandef);
168         }
169 
170         /* if VHT data is there validate & use it */
171         if (new_vht_chandef.chan) {
172                 if (!cfg80211_chandef_compatible(&new_vht_chandef,
173                                                  &csa_ie->chandef)) {
174                         sdata_info(sdata,
175                                    "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
176                                    bssid);
177                         return -EINVAL;
178                 }
179                 csa_ie->chandef = new_vht_chandef;
180         }
181 
182         return 0;
183 }
184 
185 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
186                                         struct ieee80211_msrment_ie *request_ie,
187                                         const u8 *da, const u8 *bssid,
188                                         u8 dialog_token)
189 {
190         struct ieee80211_local *local = sdata->local;
191         struct sk_buff *skb;
192         struct ieee80211_mgmt *msr_report;
193 
194         skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
195                                 sizeof(struct ieee80211_msrment_ie));
196         if (!skb)
197                 return;
198 
199         skb_reserve(skb, local->hw.extra_tx_headroom);
200         msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
201         memset(msr_report, 0, 24);
202         memcpy(msr_report->da, da, ETH_ALEN);
203         memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
204         memcpy(msr_report->bssid, bssid, ETH_ALEN);
205         msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
206                                                 IEEE80211_STYPE_ACTION);
207 
208         skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
209         msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
210         msr_report->u.action.u.measurement.action_code =
211                                 WLAN_ACTION_SPCT_MSR_RPRT;
212         msr_report->u.action.u.measurement.dialog_token = dialog_token;
213 
214         msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
215         msr_report->u.action.u.measurement.length =
216                         sizeof(struct ieee80211_msrment_ie);
217 
218         memset(&msr_report->u.action.u.measurement.msr_elem, 0,
219                 sizeof(struct ieee80211_msrment_ie));
220         msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
221         msr_report->u.action.u.measurement.msr_elem.mode |=
222                         IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
223         msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
224 
225         ieee80211_tx_skb(sdata, skb);
226 }
227 
228 void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
229                                        struct ieee80211_mgmt *mgmt,
230                                        size_t len)
231 {
232         /*
233          * Ignoring measurement request is spec violation.
234          * Mandatory measurements must be reported optional
235          * measurements might be refused or reported incapable
236          * For now just refuse
237          * TODO: Answer basic measurement as unmeasured
238          */
239         ieee80211_send_refuse_measurement_request(sdata,
240                         &mgmt->u.action.u.measurement.msr_elem,
241                         mgmt->sa, mgmt->bssid,
242                         mgmt->u.action.u.measurement.dialog_token);
243 }
244 

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