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249 lines
7.8 KiB
249 lines
7.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* spectrum management |
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* |
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* Copyright 2003, Jouni Malinen <[email protected]> |
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* Copyright 2002-2005, Instant802 Networks, Inc. |
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* Copyright 2005-2006, Devicescape Software, Inc. |
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* Copyright 2006-2007 Jiri Benc <[email protected]> |
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* Copyright 2007, Michael Wu <[email protected]> |
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* Copyright 2007-2008, Intel Corporation |
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* Copyright 2008, Johannes Berg <[email protected]> |
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* Copyright (C) 2018, 2020 Intel Corporation |
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*/ |
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#include <linux/ieee80211.h> |
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#include <net/cfg80211.h> |
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#include <net/mac80211.h> |
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#include "ieee80211_i.h" |
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#include "sta_info.h" |
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#include "wme.h" |
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int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata, |
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struct ieee802_11_elems *elems, |
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enum nl80211_band current_band, |
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u32 vht_cap_info, |
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u32 sta_flags, u8 *bssid, |
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struct ieee80211_csa_ie *csa_ie) |
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{ |
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enum nl80211_band new_band = current_band; |
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int new_freq; |
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u8 new_chan_no; |
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struct ieee80211_channel *new_chan; |
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struct cfg80211_chan_def new_vht_chandef = {}; |
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const struct ieee80211_sec_chan_offs_ie *sec_chan_offs; |
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const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie; |
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int secondary_channel_offset = -1; |
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memset(csa_ie, 0, sizeof(*csa_ie)); |
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sec_chan_offs = elems->sec_chan_offs; |
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wide_bw_chansw_ie = elems->wide_bw_chansw_ie; |
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if (sta_flags & (IEEE80211_STA_DISABLE_HT | |
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IEEE80211_STA_DISABLE_40MHZ)) { |
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sec_chan_offs = NULL; |
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wide_bw_chansw_ie = NULL; |
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} |
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if (sta_flags & IEEE80211_STA_DISABLE_VHT) |
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wide_bw_chansw_ie = NULL; |
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if (elems->ext_chansw_ie) { |
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if (!ieee80211_operating_class_to_band( |
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elems->ext_chansw_ie->new_operating_class, |
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&new_band)) { |
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sdata_info(sdata, |
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"cannot understand ECSA IE operating class, %d, ignoring\n", |
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elems->ext_chansw_ie->new_operating_class); |
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} |
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new_chan_no = elems->ext_chansw_ie->new_ch_num; |
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csa_ie->count = elems->ext_chansw_ie->count; |
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csa_ie->mode = elems->ext_chansw_ie->mode; |
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} else if (elems->ch_switch_ie) { |
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new_chan_no = elems->ch_switch_ie->new_ch_num; |
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csa_ie->count = elems->ch_switch_ie->count; |
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csa_ie->mode = elems->ch_switch_ie->mode; |
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} else { |
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/* nothing here we understand */ |
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return 1; |
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} |
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/* Mesh Channel Switch Parameters Element */ |
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if (elems->mesh_chansw_params_ie) { |
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csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl; |
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csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags; |
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csa_ie->pre_value = le16_to_cpu( |
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elems->mesh_chansw_params_ie->mesh_pre_value); |
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if (elems->mesh_chansw_params_ie->mesh_flags & |
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WLAN_EID_CHAN_SWITCH_PARAM_REASON) |
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csa_ie->reason_code = le16_to_cpu( |
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elems->mesh_chansw_params_ie->mesh_reason); |
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} |
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new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band); |
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new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); |
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if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) { |
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sdata_info(sdata, |
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"BSS %pM switches to unsupported channel (%d MHz), disconnecting\n", |
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bssid, new_freq); |
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return -EINVAL; |
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} |
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if (sec_chan_offs) { |
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secondary_channel_offset = sec_chan_offs->sec_chan_offs; |
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} else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) { |
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/* If the secondary channel offset IE is not present, |
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* we can't know what's the post-CSA offset, so the |
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* best we can do is use 20MHz. |
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*/ |
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secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE; |
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} |
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switch (secondary_channel_offset) { |
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default: |
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/* secondary_channel_offset was present but is invalid */ |
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case IEEE80211_HT_PARAM_CHA_SEC_NONE: |
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cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
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NL80211_CHAN_HT20); |
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break; |
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case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: |
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cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
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NL80211_CHAN_HT40PLUS); |
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break; |
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case IEEE80211_HT_PARAM_CHA_SEC_BELOW: |
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cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
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NL80211_CHAN_HT40MINUS); |
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break; |
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case -1: |
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cfg80211_chandef_create(&csa_ie->chandef, new_chan, |
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NL80211_CHAN_NO_HT); |
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/* keep width for 5/10 MHz channels */ |
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switch (sdata->vif.bss_conf.chandef.width) { |
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case NL80211_CHAN_WIDTH_5: |
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case NL80211_CHAN_WIDTH_10: |
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csa_ie->chandef.width = |
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sdata->vif.bss_conf.chandef.width; |
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break; |
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default: |
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break; |
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} |
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break; |
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} |
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if (wide_bw_chansw_ie) { |
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u8 new_seg1 = wide_bw_chansw_ie->new_center_freq_seg1; |
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struct ieee80211_vht_operation vht_oper = { |
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.chan_width = |
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wide_bw_chansw_ie->new_channel_width, |
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.center_freq_seg0_idx = |
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wide_bw_chansw_ie->new_center_freq_seg0, |
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.center_freq_seg1_idx = new_seg1, |
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/* .basic_mcs_set doesn't matter */ |
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}; |
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struct ieee80211_ht_operation ht_oper = { |
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.operation_mode = |
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cpu_to_le16(new_seg1 << |
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IEEE80211_HT_OP_MODE_CCFS2_SHIFT), |
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}; |
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/* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT, |
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* to the previously parsed chandef |
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*/ |
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new_vht_chandef = csa_ie->chandef; |
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/* ignore if parsing fails */ |
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if (!ieee80211_chandef_vht_oper(&sdata->local->hw, |
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vht_cap_info, |
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&vht_oper, &ht_oper, |
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&new_vht_chandef)) |
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new_vht_chandef.chan = NULL; |
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if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ && |
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new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80) |
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ieee80211_chandef_downgrade(&new_vht_chandef); |
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if (sta_flags & IEEE80211_STA_DISABLE_160MHZ && |
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new_vht_chandef.width == NL80211_CHAN_WIDTH_160) |
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ieee80211_chandef_downgrade(&new_vht_chandef); |
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} |
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/* if VHT data is there validate & use it */ |
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if (new_vht_chandef.chan) { |
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if (!cfg80211_chandef_compatible(&new_vht_chandef, |
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&csa_ie->chandef)) { |
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sdata_info(sdata, |
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"BSS %pM: CSA has inconsistent channel data, disconnecting\n", |
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bssid); |
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return -EINVAL; |
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} |
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csa_ie->chandef = new_vht_chandef; |
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} |
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if (elems->max_channel_switch_time) |
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csa_ie->max_switch_time = |
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(elems->max_channel_switch_time[0] << 0) | |
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(elems->max_channel_switch_time[1] << 8) | |
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(elems->max_channel_switch_time[2] << 16); |
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return 0; |
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} |
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static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata, |
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struct ieee80211_msrment_ie *request_ie, |
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const u8 *da, const u8 *bssid, |
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u8 dialog_token) |
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{ |
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struct ieee80211_local *local = sdata->local; |
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struct sk_buff *skb; |
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struct ieee80211_mgmt *msr_report; |
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skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom + |
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sizeof(struct ieee80211_msrment_ie)); |
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if (!skb) |
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return; |
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skb_reserve(skb, local->hw.extra_tx_headroom); |
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msr_report = skb_put_zero(skb, 24); |
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memcpy(msr_report->da, da, ETH_ALEN); |
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memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN); |
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memcpy(msr_report->bssid, bssid, ETH_ALEN); |
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msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
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IEEE80211_STYPE_ACTION); |
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skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement)); |
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msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT; |
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msr_report->u.action.u.measurement.action_code = |
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WLAN_ACTION_SPCT_MSR_RPRT; |
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msr_report->u.action.u.measurement.dialog_token = dialog_token; |
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msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT; |
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msr_report->u.action.u.measurement.length = |
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sizeof(struct ieee80211_msrment_ie); |
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memset(&msr_report->u.action.u.measurement.msr_elem, 0, |
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sizeof(struct ieee80211_msrment_ie)); |
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msr_report->u.action.u.measurement.msr_elem.token = request_ie->token; |
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msr_report->u.action.u.measurement.msr_elem.mode |= |
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IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED; |
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msr_report->u.action.u.measurement.msr_elem.type = request_ie->type; |
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ieee80211_tx_skb(sdata, skb); |
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} |
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void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata, |
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struct ieee80211_mgmt *mgmt, |
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size_t len) |
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{ |
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/* |
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* Ignoring measurement request is spec violation. |
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* Mandatory measurements must be reported optional |
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* measurements might be refused or reported incapable |
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* For now just refuse |
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* TODO: Answer basic measurement as unmeasured |
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*/ |
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ieee80211_send_refuse_measurement_request(sdata, |
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&mgmt->u.action.u.measurement.msr_elem, |
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mgmt->sa, mgmt->bssid, |
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mgmt->u.action.u.measurement.dialog_token); |
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}
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