Merge branch 'x86-kaslr-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / net / mac80211 / spectmgmt.c
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 }