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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 nl80211_band current_band,
 27                                  u32 sta_flags, u8 *bssid,
 28                                  struct ieee80211_csa_ie *csa_ie)
 29 {
 30         enum nl80211_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                 struct ieee80211_vht_operation vht_oper = {
133                         .chan_width =
134                                 wide_bw_chansw_ie->new_channel_width,
135                         .center_freq_seg1_idx =
136                                 wide_bw_chansw_ie->new_center_freq_seg0,
137                         .center_freq_seg2_idx =
138                                 wide_bw_chansw_ie->new_center_freq_seg1,
139                         /* .basic_mcs_set doesn't matter */
140                 };
141 
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))
149                         new_vht_chandef.chan = NULL;
150 
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);
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,
162                                                  &csa_ie->chandef)) {
163                         sdata_info(sdata,
164                                    "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
165                                    bssid);
166                         return -EINVAL;
167                 }
168                 csa_ie->chandef = new_vht_chandef;
169         }
170 
171         return 0;
172 }
173 
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));
185         if (!skb)
186                 return;
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);
192         memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
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 
214         ieee80211_tx_skb(sdata, skb);
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 }
233 

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