1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * spectrum management 4 * 5 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> 6 * Copyright 2002-2005, Instant802 Networks, Inc. 7 * Copyright 2005-2006, Devicescape Software, Inc. 8 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 9 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 10 * Copyright 2007-2008, Intel Corporation 11 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> 12 * Copyright (C) 2018 Intel Corporation 13 */ 14 15 #include <linux/ieee80211.h> 16 #include <net/cfg80211.h> 17 #include <net/mac80211.h> 18 #include "ieee80211_i.h" 19 #include "sta_info.h" 20 #include "wme.h" 21 22 int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata, 23 struct ieee802_11_elems *elems, 24 enum nl80211_band current_band, 25 u32 sta_flags, u8 *bssid, 26 struct ieee80211_csa_ie *csa_ie) 27 { 28 enum nl80211_band new_band = current_band; 29 int new_freq; 30 u8 new_chan_no; 31 struct ieee80211_channel *new_chan; 32 struct cfg80211_chan_def new_vht_chandef = {}; 33 const struct ieee80211_sec_chan_offs_ie *sec_chan_offs; 34 const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie; 35 int secondary_channel_offset = -1; 36 37 memset(csa_ie, 0, sizeof(*csa_ie)); 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, ignoring\n", 57 elems->ext_chansw_ie->new_operating_class); 58 } 59 new_chan_no = elems->ext_chansw_ie->new_ch_num; 60 csa_ie->count = elems->ext_chansw_ie->count; 61 csa_ie->mode = elems->ext_chansw_ie->mode; 62 } else if (elems->ch_switch_ie) { 63 new_chan_no = elems->ch_switch_ie->new_ch_num; 64 csa_ie->count = elems->ch_switch_ie->count; 65 csa_ie->mode = elems->ch_switch_ie->mode; 66 } else { 67 /* nothing here we understand */ 68 return 1; 69 } 70 71 /* Mesh Channel Switch Parameters Element */ 72 if (elems->mesh_chansw_params_ie) { 73 csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl; 74 csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags; 75 csa_ie->pre_value = le16_to_cpu( 76 elems->mesh_chansw_params_ie->mesh_pre_value); 77 78 if (elems->mesh_chansw_params_ie->mesh_flags & 79 WLAN_EID_CHAN_SWITCH_PARAM_REASON) 80 csa_ie->reason_code = le16_to_cpu( 81 elems->mesh_chansw_params_ie->mesh_reason); 82 } 83 84 new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band); 85 new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); 86 if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) { 87 sdata_info(sdata, 88 "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n", 89 bssid, new_freq); 90 return -EINVAL; 91 } 92 93 if (sec_chan_offs) { 94 secondary_channel_offset = sec_chan_offs->sec_chan_offs; 95 } else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) { 96 /* If the secondary channel offset IE is not present, 97 * we can't know what's the post-CSA offset, so the 98 * best we can do is use 20MHz. 99 */ 100 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE; 101 } 102 103 switch (secondary_channel_offset) { 104 default: 105 /* secondary_channel_offset was present but is invalid */ 106 case IEEE80211_HT_PARAM_CHA_SEC_NONE: 107 cfg80211_chandef_create(&csa_ie->chandef, new_chan, 108 NL80211_CHAN_HT20); 109 break; 110 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 111 cfg80211_chandef_create(&csa_ie->chandef, new_chan, 112 NL80211_CHAN_HT40PLUS); 113 break; 114 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 115 cfg80211_chandef_create(&csa_ie->chandef, new_chan, 116 NL80211_CHAN_HT40MINUS); 117 break; 118 case -1: 119 cfg80211_chandef_create(&csa_ie->chandef, new_chan, 120 NL80211_CHAN_NO_HT); 121 /* keep width for 5/10 MHz channels */ 122 switch (sdata->vif.bss_conf.chandef.width) { 123 case NL80211_CHAN_WIDTH_5: 124 case NL80211_CHAN_WIDTH_10: 125 csa_ie->chandef.width = 126 sdata->vif.bss_conf.chandef.width; 127 break; 128 default: 129 break; 130 } 131 break; 132 } 133 134 if (wide_bw_chansw_ie) { 135 struct ieee80211_vht_operation vht_oper = { 136 .chan_width = 137 wide_bw_chansw_ie->new_channel_width, 138 .center_freq_seg0_idx = 139 wide_bw_chansw_ie->new_center_freq_seg0, 140 .center_freq_seg1_idx = 141 wide_bw_chansw_ie->new_center_freq_seg1, 142 /* .basic_mcs_set doesn't matter */ 143 }; 144 struct ieee80211_ht_operation ht_oper = {}; 145 146 /* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT, 147 * to the previously parsed chandef 148 */ 149 new_vht_chandef = csa_ie->chandef; 150 151 /* ignore if parsing fails */ 152 if (!ieee80211_chandef_vht_oper(&sdata->local->hw, 153 &vht_oper, &ht_oper, 154 &new_vht_chandef)) 155 new_vht_chandef.chan = NULL; 156 157 if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ && 158 new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80) 159 ieee80211_chandef_downgrade(&new_vht_chandef); 160 if (sta_flags & IEEE80211_STA_DISABLE_160MHZ && 161 new_vht_chandef.width == NL80211_CHAN_WIDTH_160) 162 ieee80211_chandef_downgrade(&new_vht_chandef); 163 } 164 165 /* if VHT data is there validate & use it */ 166 if (new_vht_chandef.chan) { 167 if (!cfg80211_chandef_compatible(&new_vht_chandef, 168 &csa_ie->chandef)) { 169 sdata_info(sdata, 170 "BSS %pM: CSA has inconsistent channel data, disconnecting\n", 171 bssid); 172 return -EINVAL; 173 } 174 csa_ie->chandef = new_vht_chandef; 175 } 176 177 if (elems->max_channel_switch_time) 178 csa_ie->max_switch_time = 179 (elems->max_channel_switch_time[0] << 0) | 180 (elems->max_channel_switch_time[1] << 8) | 181 (elems->max_channel_switch_time[2] << 16); 182 183 return 0; 184 } 185 186 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata, 187 struct ieee80211_msrment_ie *request_ie, 188 const u8 *da, const u8 *bssid, 189 u8 dialog_token) 190 { 191 struct ieee80211_local *local = sdata->local; 192 struct sk_buff *skb; 193 struct ieee80211_mgmt *msr_report; 194 195 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom + 196 sizeof(struct ieee80211_msrment_ie)); 197 if (!skb) 198 return; 199 200 skb_reserve(skb, local->hw.extra_tx_headroom); 201 msr_report = skb_put_zero(skb, 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