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https://github.com/torvalds/linux
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wifi: mac80211: mlme: handle EHT channel puncturing
Handle the Puncturing info received from the AP in the EHT Operation element in beacons. If the info is invalid: - during association: disable EHT connection for the AP - after association: disconnect This commit includes many (internal) bugfixes and spec updates various people. Co-developed-by: Miri Korenblit <miriam.rachel.korenblit@intel.com> Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com> Link: https://lore.kernel.org/r/20230127123930.4fbc74582331.I3547481d49f958389f59dfeba3fcc75e72b0aa6e@changeid Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
parent
8bb588d975
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aa87cd8b35
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@ -340,7 +340,7 @@ struct ieee80211_vif_chanctx_switch {
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* @BSS_CHANGED_FILS_DISCOVERY: FILS discovery status changed.
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* @BSS_CHANGED_UNSOL_BCAST_PROBE_RESP: Unsolicited broadcast probe response
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* status changed.
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*
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* @BSS_CHANGED_EHT_PUNCTURING: The channel puncturing bitmap changed.
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*/
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enum ieee80211_bss_change {
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BSS_CHANGED_ASSOC = 1<<0,
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@ -375,6 +375,7 @@ enum ieee80211_bss_change {
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BSS_CHANGED_HE_BSS_COLOR = 1<<29,
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BSS_CHANGED_FILS_DISCOVERY = 1<<30,
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BSS_CHANGED_UNSOL_BCAST_PROBE_RESP = 1<<31,
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BSS_CHANGED_EHT_PUNCTURING = BIT_ULL(32),
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/* when adding here, make sure to change ieee80211_reconfig */
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};
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@ -640,6 +641,7 @@ struct ieee80211_fils_discovery {
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* @tx_pwr_env_num: number of @tx_pwr_env.
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* @pwr_reduction: power constraint of BSS.
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* @eht_support: does this BSS support EHT
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* @eht_puncturing: bitmap to indicate which channels are punctured in this BSS
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* @csa_active: marks whether a channel switch is going on. Internally it is
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* write-protected by sdata_lock and local->mtx so holding either is fine
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* for read access.
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@ -736,6 +738,7 @@ struct ieee80211_bss_conf {
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u8 tx_pwr_env_num;
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u8 pwr_reduction;
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bool eht_support;
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u16 eht_puncturing;
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bool csa_active;
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bool mu_mimo_owner;
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@ -4171,7 +4171,7 @@ static int ieee80211_set_ap_chanwidth(struct wiphy *wiphy,
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struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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struct ieee80211_link_data *link;
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int ret;
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u32 changed = 0;
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u64 changed = 0;
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link = sdata_dereference(sdata->link[link_id], sdata);
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@ -1916,7 +1916,7 @@ int ieee80211_link_use_reserved_context(struct ieee80211_link_data *link)
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int ieee80211_link_change_bandwidth(struct ieee80211_link_data *link,
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const struct cfg80211_chan_def *chandef,
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u32 *changed)
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u64 *changed)
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{
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struct ieee80211_sub_if_data *sdata = link->sdata;
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struct ieee80211_bss_conf *link_conf = link->conf;
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@ -2481,7 +2481,7 @@ int ieee80211_link_unreserve_chanctx(struct ieee80211_link_data *link);
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int __must_check
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ieee80211_link_change_bandwidth(struct ieee80211_link_data *link,
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const struct cfg80211_chan_def *chandef,
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u32 *changed);
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u64 *changed);
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void ieee80211_link_release_channel(struct ieee80211_link_data *link);
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void ieee80211_link_vlan_copy_chanctx(struct ieee80211_link_data *link);
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void ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link,
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@ -8,7 +8,7 @@
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* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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* Copyright 2013-2014 Intel Mobile Communications GmbH
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* Copyright (C) 2015 - 2017 Intel Deutschland GmbH
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* Copyright (C) 2018 - 2022 Intel Corporation
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* Copyright (C) 2018 - 2023 Intel Corporation
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*/
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#include <linux/delay.h>
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@ -88,6 +88,141 @@ MODULE_PARM_DESC(probe_wait_ms,
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*/
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#define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
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struct ieee80211_per_bw_puncturing_values {
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u8 len;
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const u16 *valid_values;
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};
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static const u16 puncturing_values_80mhz[] = {
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0x8, 0x4, 0x2, 0x1
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};
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static const u16 puncturing_values_160mhz[] = {
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0x80, 0x40, 0x20, 0x10, 0x8, 0x4, 0x2, 0x1, 0xc0, 0x30, 0xc, 0x3
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};
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static const u16 puncturing_values_320mhz[] = {
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0xc000, 0x3000, 0xc00, 0x300, 0xc0, 0x30, 0xc, 0x3, 0xf000, 0xf00,
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0xf0, 0xf, 0xfc00, 0xf300, 0xf0c0, 0xf030, 0xf00c, 0xf003, 0xc00f,
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0x300f, 0xc0f, 0x30f, 0xcf, 0x3f
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};
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#define IEEE80211_PER_BW_VALID_PUNCTURING_VALUES(_bw) \
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{ \
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.len = ARRAY_SIZE(puncturing_values_ ## _bw ## mhz), \
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.valid_values = puncturing_values_ ## _bw ## mhz \
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}
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static const struct ieee80211_per_bw_puncturing_values per_bw_puncturing[] = {
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IEEE80211_PER_BW_VALID_PUNCTURING_VALUES(80),
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IEEE80211_PER_BW_VALID_PUNCTURING_VALUES(160),
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IEEE80211_PER_BW_VALID_PUNCTURING_VALUES(320)
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};
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static bool ieee80211_valid_disable_subchannel_bitmap(u16 *bitmap,
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enum nl80211_chan_width bw)
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{
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u32 idx, i;
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switch (bw) {
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case NL80211_CHAN_WIDTH_80:
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idx = 0;
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break;
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case NL80211_CHAN_WIDTH_160:
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idx = 1;
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break;
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case NL80211_CHAN_WIDTH_320:
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idx = 2;
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break;
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default:
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*bitmap = 0;
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break;
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}
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if (!*bitmap)
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return true;
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for (i = 0; i < per_bw_puncturing[idx].len; i++)
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if (per_bw_puncturing[idx].valid_values[i] == *bitmap)
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return true;
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return false;
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}
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/*
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* Extract from the given disabled subchannel bitmap (raw format
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* from the EHT Operation Element) the bits for the subchannel
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* we're using right now.
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*/
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static u16
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ieee80211_extract_dis_subch_bmap(const struct ieee80211_eht_operation *eht_oper,
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struct cfg80211_chan_def *chandef, u16 bitmap)
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{
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struct ieee80211_eht_operation_info *info = (void *)eht_oper->optional;
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struct cfg80211_chan_def ap_chandef = *chandef;
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u32 ap_center_freq, local_center_freq;
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u32 ap_bw, local_bw;
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int ap_start_freq, local_start_freq;
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u16 shift, mask;
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if (!(eht_oper->params & IEEE80211_EHT_OPER_INFO_PRESENT) ||
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!(eht_oper->params &
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IEEE80211_EHT_OPER_DISABLED_SUBCHANNEL_BITMAP_PRESENT))
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return 0;
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/* set 160/320 supported to get the full AP definition */
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ieee80211_chandef_eht_oper(eht_oper, true, true, &ap_chandef);
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ap_center_freq = ap_chandef.center_freq1;
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ap_bw = 20 * BIT(u8_get_bits(info->control,
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IEEE80211_EHT_OPER_CHAN_WIDTH));
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ap_start_freq = ap_center_freq - ap_bw / 2;
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local_center_freq = chandef->center_freq1;
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local_bw = 20 * BIT(ieee80211_chan_width_to_rx_bw(chandef->width));
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local_start_freq = local_center_freq - local_bw / 2;
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shift = (local_start_freq - ap_start_freq) / 20;
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mask = BIT(local_bw / 20) - 1;
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return (bitmap >> shift) & mask;
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}
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/*
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* Handle the puncturing bitmap, possibly downgrading bandwidth to get a
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* valid bitmap.
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*/
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static void
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ieee80211_handle_puncturing_bitmap(struct ieee80211_link_data *link,
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const struct ieee80211_eht_operation *eht_oper,
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u16 bitmap, u64 *changed)
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{
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struct cfg80211_chan_def *chandef = &link->conf->chandef;
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u16 extracted;
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u64 _changed = 0;
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if (!changed)
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changed = &_changed;
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while (chandef->width > NL80211_CHAN_WIDTH_40) {
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extracted =
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ieee80211_extract_dis_subch_bmap(eht_oper, chandef,
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bitmap);
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if (ieee80211_valid_disable_subchannel_bitmap(&bitmap,
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chandef->width))
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break;
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link->u.mgd.conn_flags |=
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ieee80211_chandef_downgrade(chandef);
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*changed |= BSS_CHANGED_BANDWIDTH;
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}
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if (chandef->width <= NL80211_CHAN_WIDTH_40)
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extracted = 0;
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if (link->conf->eht_puncturing != extracted) {
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link->conf->eht_puncturing = extracted;
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*changed |= BSS_CHANGED_EHT_PUNCTURING;
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}
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}
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/*
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* We can have multiple work items (and connection probing)
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* scheduling this timer, but we need to take care to only
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@ -413,7 +548,7 @@ static int ieee80211_config_bw(struct ieee80211_link_data *link,
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const struct ieee80211_he_operation *he_oper,
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const struct ieee80211_eht_operation *eht_oper,
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const struct ieee80211_s1g_oper_ie *s1g_oper,
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const u8 *bssid, u32 *changed)
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const u8 *bssid, u64 *changed)
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{
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struct ieee80211_sub_if_data *sdata = link->sdata;
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struct ieee80211_local *local = sdata->local;
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link_sta);
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bss_conf->eht_support = link_sta->pub->eht_cap.has_eht;
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*changed |= BSS_CHANGED_EHT_PUNCTURING;
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} else {
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bss_conf->eht_support = false;
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}
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@ -5477,6 +5613,45 @@ static bool ieee80211_rx_our_beacon(const u8 *tx_bssid,
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return ether_addr_equal(tx_bssid, bss->transmitted_bss->bssid);
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}
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static bool ieee80211_config_puncturing(struct ieee80211_link_data *link,
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const struct ieee80211_eht_operation *eht_oper,
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u64 *changed)
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{
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u16 bitmap = 0, extracted;
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if ((eht_oper->params & IEEE80211_EHT_OPER_INFO_PRESENT) &&
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(eht_oper->params &
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IEEE80211_EHT_OPER_DISABLED_SUBCHANNEL_BITMAP_PRESENT)) {
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const struct ieee80211_eht_operation_info *info =
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(void *)eht_oper->optional;
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const u8 *disable_subchannel_bitmap = info->optional;
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bitmap = get_unaligned_le16(disable_subchannel_bitmap);
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}
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extracted = ieee80211_extract_dis_subch_bmap(eht_oper,
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&link->conf->chandef,
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bitmap);
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/* accept if there are no changes */
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if (!(*changed & BSS_CHANGED_BANDWIDTH) &&
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extracted == link->conf->eht_puncturing)
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return true;
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if (!ieee80211_valid_disable_subchannel_bitmap(&bitmap,
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link->conf->chandef.width)) {
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link_info(link,
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"Got an invalid disable subchannel bitmap from AP %pM: bitmap = 0x%x, bw = 0x%x. disconnect\n",
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link->u.mgd.bssid,
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bitmap,
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link->conf->chandef.width);
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return false;
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}
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ieee80211_handle_puncturing_bitmap(link, eht_oper, bitmap, changed);
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return true;
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}
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static void ieee80211_rx_mgmt_beacon(struct ieee80211_link_data *link,
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struct ieee80211_hdr *hdr, size_t len,
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struct ieee80211_rx_status *rx_status)
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struct ieee80211_channel *chan;
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struct link_sta_info *link_sta;
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struct sta_info *sta;
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u32 changed = 0;
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u64 changed = 0;
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bool erp_valid;
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u8 erp_value = 0;
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u32 ncrc = 0;
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@ -5791,6 +5966,21 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_link_data *link,
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elems->pwr_constr_elem,
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elems->cisco_dtpc_elem);
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if (elems->eht_operation &&
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!(link->u.mgd.conn_flags & IEEE80211_CONN_DISABLE_EHT)) {
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if (!ieee80211_config_puncturing(link, elems->eht_operation,
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&changed)) {
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ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
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WLAN_REASON_DEAUTH_LEAVING,
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true, deauth_buf);
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ieee80211_report_disconnect(sdata, deauth_buf,
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sizeof(deauth_buf), true,
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WLAN_REASON_DEAUTH_LEAVING,
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false);
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goto free;
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}
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}
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ieee80211_link_info_change_notify(sdata, link, changed);
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free:
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kfree(elems);
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@ -6892,9 +7082,12 @@ ieee80211_setup_assoc_link(struct ieee80211_sub_if_data *sdata,
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ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
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}
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link->conf->eht_puncturing = 0;
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rcu_read_lock();
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beacon_ies = rcu_dereference(cbss->beacon_ies);
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if (beacon_ies) {
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const struct ieee80211_eht_operation *eht_oper;
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const struct element *elem;
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u8 dtim_count = 0;
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link->conf->ema_ap = true;
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else
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link->conf->ema_ap = false;
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elem = cfg80211_find_ext_elem(WLAN_EID_EXT_EHT_OPERATION,
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beacon_ies->data, beacon_ies->len);
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eht_oper = (const void *)(elem->data + 1);
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if (elem &&
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ieee80211_eht_oper_size_ok((const void *)(elem->data + 1),
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elem->datalen - 1) &&
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(eht_oper->params & IEEE80211_EHT_OPER_INFO_PRESENT) &&
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(eht_oper->params & IEEE80211_EHT_OPER_DISABLED_SUBCHANNEL_BITMAP_PRESENT)) {
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const struct ieee80211_eht_operation_info *info =
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(void *)eht_oper->optional;
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const u8 *disable_subchannel_bitmap = info->optional;
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u16 bitmap;
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bitmap = get_unaligned_le16(disable_subchannel_bitmap);
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if (ieee80211_valid_disable_subchannel_bitmap(&bitmap,
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link->conf->chandef.width))
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ieee80211_handle_puncturing_bitmap(link,
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eht_oper,
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bitmap,
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NULL);
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else
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conn_flags |= IEEE80211_CONN_DISABLE_EHT;
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}
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}
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rcu_read_unlock();
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