Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame] | 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 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 | 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 | new_vht_chandef.chan = new_chan; |
| 133 | new_vht_chandef.center_freq1 = |
| 134 | ieee80211_channel_to_frequency( |
| 135 | wide_bw_chansw_ie->new_center_freq_seg0, |
| 136 | new_band); |
| 137 | |
| 138 | switch (wide_bw_chansw_ie->new_channel_width) { |
| 139 | default: |
| 140 | /* hmmm, ignore VHT and use HT if present */ |
| 141 | case IEEE80211_VHT_CHANWIDTH_USE_HT: |
| 142 | new_vht_chandef.chan = NULL; |
| 143 | break; |
| 144 | case IEEE80211_VHT_CHANWIDTH_80MHZ: |
| 145 | new_vht_chandef.width = NL80211_CHAN_WIDTH_80; |
| 146 | break; |
| 147 | case IEEE80211_VHT_CHANWIDTH_160MHZ: |
| 148 | new_vht_chandef.width = NL80211_CHAN_WIDTH_160; |
| 149 | break; |
| 150 | case IEEE80211_VHT_CHANWIDTH_80P80MHZ: |
| 151 | /* field is otherwise reserved */ |
| 152 | new_vht_chandef.center_freq2 = |
| 153 | ieee80211_channel_to_frequency( |
| 154 | wide_bw_chansw_ie->new_center_freq_seg1, |
| 155 | new_band); |
| 156 | new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80; |
| 157 | break; |
| 158 | } |
| 159 | if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ && |
| 160 | new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80) |
| 161 | ieee80211_chandef_downgrade(&new_vht_chandef); |
| 162 | if (sta_flags & IEEE80211_STA_DISABLE_160MHZ && |
| 163 | new_vht_chandef.width == NL80211_CHAN_WIDTH_160) |
| 164 | ieee80211_chandef_downgrade(&new_vht_chandef); |
| 165 | if (sta_flags & IEEE80211_STA_DISABLE_40MHZ && |
| 166 | new_vht_chandef.width > NL80211_CHAN_WIDTH_20) |
| 167 | ieee80211_chandef_downgrade(&new_vht_chandef); |
| 168 | } |
| 169 | |
| 170 | /* if VHT data is there validate & use it */ |
| 171 | if (new_vht_chandef.chan) { |
| 172 | if (!cfg80211_chandef_compatible(&new_vht_chandef, |
| 173 | &csa_ie->chandef)) { |
| 174 | sdata_info(sdata, |
| 175 | "BSS %pM: CSA has inconsistent channel data, disconnecting\n", |
| 176 | bssid); |
| 177 | return -EINVAL; |
| 178 | } |
| 179 | csa_ie->chandef = new_vht_chandef; |
| 180 | } |
| 181 | |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata, |
| 186 | struct ieee80211_msrment_ie *request_ie, |
| 187 | const u8 *da, const u8 *bssid, |
| 188 | u8 dialog_token) |
| 189 | { |
| 190 | struct ieee80211_local *local = sdata->local; |
| 191 | struct sk_buff *skb; |
| 192 | struct ieee80211_mgmt *msr_report; |
| 193 | |
| 194 | skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom + |
| 195 | sizeof(struct ieee80211_msrment_ie)); |
| 196 | if (!skb) |
| 197 | return; |
| 198 | |
| 199 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 200 | msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24); |
| 201 | memset(msr_report, 0, 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 | } |