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 memset(csa_ie, 0, sizeof(*csa_ie)); 40 41 sec_chan_offs = elems->sec_chan_offs; 42 wide_bw_chansw_ie = elems->wide_bw_chansw_ie; 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 } 49 50 if (sta_flags & IEEE80211_STA_DISABLE_VHT) 51 wide_bw_chansw_ie = NULL; 52 53 if (elems->ext_chansw_ie) { 54 if (!ieee80211_operating_class_to_band( 55 elems->ext_chansw_ie->new_operating_class, 56 &new_band)) { 57 sdata_info(sdata, 58 "cannot understand ECSA IE operating class %d, disconnecting\n", 59 elems->ext_chansw_ie->new_operating_class); 60 return -EINVAL; 61 } 62 new_chan_no = elems->ext_chansw_ie->new_ch_num; 63 csa_ie->count = elems->ext_chansw_ie->count; 64 csa_ie->mode = elems->ext_chansw_ie->mode; 65 } else if (elems->ch_switch_ie) { 66 new_band = current_band; 67 new_chan_no = elems->ch_switch_ie->new_ch_num; 68 csa_ie->count = elems->ch_switch_ie->count; 69 csa_ie->mode = elems->ch_switch_ie->mode; 70 } else { 71 /* nothing here we understand */ 72 return 1; 73 } 74 75 /* Mesh Channel Switch Parameters Element */ 76 if (elems->mesh_chansw_params_ie) { 77 csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl; 78 csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags; 79 csa_ie->pre_value = le16_to_cpu( 80 elems->mesh_chansw_params_ie->mesh_pre_value); 81 82 if (elems->mesh_chansw_params_ie->mesh_flags & 83 WLAN_EID_CHAN_SWITCH_PARAM_REASON) 84 csa_ie->reason_code = le16_to_cpu( 85 elems->mesh_chansw_params_ie->mesh_reason); 86 } 87 88 new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band); 89 new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); 90 if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) { 91 sdata_info(sdata, 92 "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n", 93 bssid, new_freq); 94 return -EINVAL; 95 } 96 97 if (sec_chan_offs) { 98 secondary_channel_offset = sec_chan_offs->sec_chan_offs; 99 } else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) { 100 /* If the secondary channel offset IE is not present, 101 * we can't know what's the post-CSA offset, so the 102 * best we can do is use 20MHz. 103 */ 104 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE; 105 } 106 107 switch (secondary_channel_offset) { 108 default: 109 /* secondary_channel_offset was present but is invalid */ 110 case IEEE80211_HT_PARAM_CHA_SEC_NONE: 111 cfg80211_chandef_create(&csa_ie->chandef, new_chan, 112 NL80211_CHAN_HT20); 113 break; 114 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 115 cfg80211_chandef_create(&csa_ie->chandef, new_chan, 116 NL80211_CHAN_HT40PLUS); 117 break; 118 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 119 cfg80211_chandef_create(&csa_ie->chandef, new_chan, 120 NL80211_CHAN_HT40MINUS); 121 break; 122 case -1: 123 cfg80211_chandef_create(&csa_ie->chandef, new_chan, 124 NL80211_CHAN_NO_HT); 125 /* keep width for 5/10 MHz channels */ 126 switch (sdata->vif.bss_conf.chandef.width) { 127 case NL80211_CHAN_WIDTH_5: 128 case NL80211_CHAN_WIDTH_10: 129 csa_ie->chandef.width = 130 sdata->vif.bss_conf.chandef.width; 131 break; 132 default: 133 break; 134 } 135 break; 136 } 137 138 if (wide_bw_chansw_ie) { 139 struct ieee80211_vht_operation vht_oper = { 140 .chan_width = 141 wide_bw_chansw_ie->new_channel_width, 142 .center_freq_seg0_idx = 143 wide_bw_chansw_ie->new_center_freq_seg0, 144 .center_freq_seg1_idx = 145 wide_bw_chansw_ie->new_center_freq_seg1, 146 /* .basic_mcs_set doesn't matter */ 147 }; 148 149 /* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT, 150 * to the previously parsed chandef 151 */ 152 new_vht_chandef = csa_ie->chandef; 153 154 /* ignore if parsing fails */ 155 if (!ieee80211_chandef_vht_oper(&vht_oper, &new_vht_chandef)) 156 new_vht_chandef.chan = NULL; 157 158 if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ && 159 new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80) 160 ieee80211_chandef_downgrade(&new_vht_chandef); 161 if (sta_flags & IEEE80211_STA_DISABLE_160MHZ && 162 new_vht_chandef.width == NL80211_CHAN_WIDTH_160) 163 ieee80211_chandef_downgrade(&new_vht_chandef); 164 } 165 166 /* if VHT data is there validate & use it */ 167 if (new_vht_chandef.chan) { 168 if (!cfg80211_chandef_compatible(&new_vht_chandef, 169 &csa_ie->chandef)) { 170 sdata_info(sdata, 171 "BSS %pM: CSA has inconsistent channel data, disconnecting\n", 172 bssid); 173 return -EINVAL; 174 } 175 csa_ie->chandef = new_vht_chandef; 176 } 177 178 return 0; 179 } 180 181 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata, 182 struct ieee80211_msrment_ie *request_ie, 183 const u8 *da, const u8 *bssid, 184 u8 dialog_token) 185 { 186 struct ieee80211_local *local = sdata->local; 187 struct sk_buff *skb; 188 struct ieee80211_mgmt *msr_report; 189 190 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom + 191 sizeof(struct ieee80211_msrment_ie)); 192 if (!skb) 193 return; 194 195 skb_reserve(skb, local->hw.extra_tx_headroom); 196 msr_report = skb_put_zero(skb, 24); 197 memcpy(msr_report->da, da, ETH_ALEN); 198 memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN); 199 memcpy(msr_report->bssid, bssid, ETH_ALEN); 200 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 201 IEEE80211_STYPE_ACTION); 202 203 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement)); 204 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT; 205 msr_report->u.action.u.measurement.action_code = 206 WLAN_ACTION_SPCT_MSR_RPRT; 207 msr_report->u.action.u.measurement.dialog_token = dialog_token; 208 209 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT; 210 msr_report->u.action.u.measurement.length = 211 sizeof(struct ieee80211_msrment_ie); 212 213 memset(&msr_report->u.action.u.measurement.msr_elem, 0, 214 sizeof(struct ieee80211_msrment_ie)); 215 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token; 216 msr_report->u.action.u.measurement.msr_elem.mode |= 217 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED; 218 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type; 219 220 ieee80211_tx_skb(sdata, skb); 221 } 222 223 void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata, 224 struct ieee80211_mgmt *mgmt, 225 size_t len) 226 { 227 /* 228 * Ignoring measurement request is spec violation. 229 * Mandatory measurements must be reported optional 230 * measurements might be refused or reported incapable 231 * For now just refuse 232 * TODO: Answer basic measurement as unmeasured 233 */ 234 ieee80211_send_refuse_measurement_request(sdata, 235 &mgmt->u.action.u.measurement.msr_elem, 236 mgmt->sa, mgmt->bssid, 237 mgmt->u.action.u.measurement.dialog_token); 238 } 239