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, 2020, 2022 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 vht_cap_info, 26 ieee80211_conn_flags_t conn_flags, u8 *bssid, 27 struct ieee80211_csa_ie *csa_ie) 28 { 29 enum nl80211_band new_band = current_band; 30 int new_freq; 31 u8 new_chan_no; 32 struct ieee80211_channel *new_chan; 33 struct cfg80211_chan_def new_vht_chandef = {}; 34 const struct ieee80211_sec_chan_offs_ie *sec_chan_offs; 35 const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie; 36 int secondary_channel_offset = -1; 37 38 memset(csa_ie, 0, sizeof(*csa_ie)); 39 40 sec_chan_offs = elems->sec_chan_offs; 41 wide_bw_chansw_ie = elems->wide_bw_chansw_ie; 42 43 if (conn_flags & (IEEE80211_CONN_DISABLE_HT | 44 IEEE80211_CONN_DISABLE_40MHZ)) { 45 sec_chan_offs = NULL; 46 wide_bw_chansw_ie = NULL; 47 } 48 49 if (conn_flags & IEEE80211_CONN_DISABLE_VHT) 50 wide_bw_chansw_ie = NULL; 51 52 if (elems->ext_chansw_ie) { 53 if (!ieee80211_operating_class_to_band( 54 elems->ext_chansw_ie->new_operating_class, 55 &new_band)) { 56 sdata_info(sdata, 57 "cannot understand ECSA IE operating class, %d, ignoring\n", 58 elems->ext_chansw_ie->new_operating_class); 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_chan_no = elems->ch_switch_ie->new_ch_num; 65 csa_ie->count = elems->ch_switch_ie->count; 66 csa_ie->mode = elems->ch_switch_ie->mode; 67 } else { 68 /* nothing here we understand */ 69 return 1; 70 } 71 72 /* Mesh Channel Switch Parameters Element */ 73 if (elems->mesh_chansw_params_ie) { 74 csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl; 75 csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags; 76 csa_ie->pre_value = le16_to_cpu( 77 elems->mesh_chansw_params_ie->mesh_pre_value); 78 79 if (elems->mesh_chansw_params_ie->mesh_flags & 80 WLAN_EID_CHAN_SWITCH_PARAM_REASON) 81 csa_ie->reason_code = le16_to_cpu( 82 elems->mesh_chansw_params_ie->mesh_reason); 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 (sec_chan_offs) { 95 secondary_channel_offset = sec_chan_offs->sec_chan_offs; 96 } else if (!(conn_flags & IEEE80211_CONN_DISABLE_HT)) { 97 /* If the secondary channel offset IE is not present, 98 * we can't know what's the post-CSA offset, so the 99 * best we can do is use 20MHz. 100 */ 101 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE; 102 } 103 104 switch (secondary_channel_offset) { 105 default: 106 /* secondary_channel_offset was present but is invalid */ 107 case IEEE80211_HT_PARAM_CHA_SEC_NONE: 108 cfg80211_chandef_create(&csa_ie->chandef, new_chan, 109 NL80211_CHAN_HT20); 110 break; 111 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 112 cfg80211_chandef_create(&csa_ie->chandef, new_chan, 113 NL80211_CHAN_HT40PLUS); 114 break; 115 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 116 cfg80211_chandef_create(&csa_ie->chandef, new_chan, 117 NL80211_CHAN_HT40MINUS); 118 break; 119 case -1: 120 cfg80211_chandef_create(&csa_ie->chandef, new_chan, 121 NL80211_CHAN_NO_HT); 122 /* keep width for 5/10 MHz channels */ 123 switch (sdata->vif.bss_conf.chandef.width) { 124 case NL80211_CHAN_WIDTH_5: 125 case NL80211_CHAN_WIDTH_10: 126 csa_ie->chandef.width = 127 sdata->vif.bss_conf.chandef.width; 128 break; 129 default: 130 break; 131 } 132 break; 133 } 134 135 if (wide_bw_chansw_ie) { 136 u8 new_seg1 = wide_bw_chansw_ie->new_center_freq_seg1; 137 struct ieee80211_vht_operation vht_oper = { 138 .chan_width = 139 wide_bw_chansw_ie->new_channel_width, 140 .center_freq_seg0_idx = 141 wide_bw_chansw_ie->new_center_freq_seg0, 142 .center_freq_seg1_idx = new_seg1, 143 /* .basic_mcs_set doesn't matter */ 144 }; 145 struct ieee80211_ht_operation ht_oper = { 146 .operation_mode = 147 cpu_to_le16(new_seg1 << 148 IEEE80211_HT_OP_MODE_CCFS2_SHIFT), 149 }; 150 151 /* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT, 152 * to the previously parsed chandef 153 */ 154 new_vht_chandef = csa_ie->chandef; 155 156 /* ignore if parsing fails */ 157 if (!ieee80211_chandef_vht_oper(&sdata->local->hw, 158 vht_cap_info, 159 &vht_oper, &ht_oper, 160 &new_vht_chandef)) 161 new_vht_chandef.chan = NULL; 162 163 if (conn_flags & IEEE80211_CONN_DISABLE_80P80MHZ && 164 new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80) 165 ieee80211_chandef_downgrade(&new_vht_chandef); 166 if (conn_flags & IEEE80211_CONN_DISABLE_160MHZ && 167 new_vht_chandef.width == NL80211_CHAN_WIDTH_160) 168 ieee80211_chandef_downgrade(&new_vht_chandef); 169 } 170 171 /* if VHT data is there validate & use it */ 172 if (new_vht_chandef.chan) { 173 if (!cfg80211_chandef_compatible(&new_vht_chandef, 174 &csa_ie->chandef)) { 175 sdata_info(sdata, 176 "BSS %pM: CSA has inconsistent channel data, disconnecting\n", 177 bssid); 178 return -EINVAL; 179 } 180 csa_ie->chandef = new_vht_chandef; 181 } 182 183 if (elems->max_channel_switch_time) 184 csa_ie->max_switch_time = 185 (elems->max_channel_switch_time[0] << 0) | 186 (elems->max_channel_switch_time[1] << 8) | 187 (elems->max_channel_switch_time[2] << 16); 188 189 return 0; 190 } 191 192 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata, 193 struct ieee80211_msrment_ie *request_ie, 194 const u8 *da, const u8 *bssid, 195 u8 dialog_token) 196 { 197 struct ieee80211_local *local = sdata->local; 198 struct sk_buff *skb; 199 struct ieee80211_mgmt *msr_report; 200 201 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom + 202 sizeof(struct ieee80211_msrment_ie)); 203 if (!skb) 204 return; 205 206 skb_reserve(skb, local->hw.extra_tx_headroom); 207 msr_report = skb_put_zero(skb, 24); 208 memcpy(msr_report->da, da, ETH_ALEN); 209 memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN); 210 memcpy(msr_report->bssid, bssid, ETH_ALEN); 211 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 212 IEEE80211_STYPE_ACTION); 213 214 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement)); 215 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT; 216 msr_report->u.action.u.measurement.action_code = 217 WLAN_ACTION_SPCT_MSR_RPRT; 218 msr_report->u.action.u.measurement.dialog_token = dialog_token; 219 220 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT; 221 msr_report->u.action.u.measurement.length = 222 sizeof(struct ieee80211_msrment_ie); 223 224 memset(&msr_report->u.action.u.measurement.msr_elem, 0, 225 sizeof(struct ieee80211_msrment_ie)); 226 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token; 227 msr_report->u.action.u.measurement.msr_elem.mode |= 228 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED; 229 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type; 230 231 ieee80211_tx_skb(sdata, skb); 232 } 233 234 void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata, 235 struct ieee80211_mgmt *mgmt, 236 size_t len) 237 { 238 /* 239 * Ignoring measurement request is spec violation. 240 * Mandatory measurements must be reported optional 241 * measurements might be refused or reported incapable 242 * For now just refuse 243 * TODO: Answer basic measurement as unmeasured 244 */ 245 ieee80211_send_refuse_measurement_request(sdata, 246 &mgmt->u.action.u.measurement.msr_elem, 247 mgmt->sa, mgmt->bssid, 248 mgmt->u.action.u.measurement.dialog_token); 249 } 250