From: Johannes Berg <johannes.berg@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
include/net/mac80211.h | 5 +-
net/mac80211/cfg.c | 2 +-
net/mac80211/chan.c | 2 +-
net/mac80211/ieee80211_i.h | 2 +-
net/mac80211/mlme.c | 224 ++++++++++++++++++++++++++++++++++++-
5 files changed, 228 insertions(+), 7 deletions(-)
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 2635e6de8101..54ffc0cc2918 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -340,7 +340,7 @@ struct ieee80211_vif_chanctx_switch {
* @BSS_CHANGED_FILS_DISCOVERY: FILS discovery status changed.
* @BSS_CHANGED_UNSOL_BCAST_PROBE_RESP: Unsolicited broadcast probe response
* status changed.
- *
+ * @BSS_CHANGED_EHT_PUNCTURING: The channel puncturing bitmap changed.
*/
enum ieee80211_bss_change {
BSS_CHANGED_ASSOC = 1<<0,
@@ -375,6 +375,7 @@ enum ieee80211_bss_change {
BSS_CHANGED_HE_BSS_COLOR = 1<<29,
BSS_CHANGED_FILS_DISCOVERY = 1<<30,
BSS_CHANGED_UNSOL_BCAST_PROBE_RESP = 1<<31,
+ BSS_CHANGED_EHT_PUNCTURING = BIT_ULL(32),
/* when adding here, make sure to change ieee80211_reconfig */
};
@@ -640,6 +641,7 @@ struct ieee80211_fils_discovery {
* @tx_pwr_env_num: number of @tx_pwr_env.
* @pwr_reduction: power constraint of BSS.
* @eht_support: does this BSS support EHT
+ * @eht_puncturing: bitmap to indicate which channels are punctured in this BSS
* @csa_active: marks whether a channel switch is going on. Internally it is
* write-protected by sdata_lock and local->mtx so holding either is fine
* for read access.
@@ -736,6 +738,7 @@ struct ieee80211_bss_conf {
u8 tx_pwr_env_num;
u8 pwr_reduction;
bool eht_support;
+ u16 eht_puncturing;
bool csa_active;
bool mu_mimo_owner;
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index f5d43f42f6d8..24b8648cfafa 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -4171,7 +4171,7 @@ static int ieee80211_set_ap_chanwidth(struct wiphy *wiphy,
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_link_data *link;
int ret;
- u32 changed = 0;
+ u64 changed = 0;
link = sdata_dereference(sdata->link[link_id], sdata);
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index e72cf0749d49..dbc34fbe7c8f 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -1916,7 +1916,7 @@ int ieee80211_link_use_reserved_context(struct ieee80211_link_data *link)
int ieee80211_link_change_bandwidth(struct ieee80211_link_data *link,
const struct cfg80211_chan_def *chandef,
- u32 *changed)
+ u64 *changed)
{
struct ieee80211_sub_if_data *sdata = link->sdata;
struct ieee80211_bss_conf *link_conf = link->conf;
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index d16606e84e22..e833d472ff72 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -2478,7 +2478,7 @@ int ieee80211_link_unreserve_chanctx(struct ieee80211_link_data *link);
int __must_check
ieee80211_link_change_bandwidth(struct ieee80211_link_data *link,
const struct cfg80211_chan_def *chandef,
- u32 *changed);
+ u64 *changed);
void ieee80211_link_release_channel(struct ieee80211_link_data *link);
void ieee80211_link_vlan_copy_chanctx(struct ieee80211_link_data *link);
void ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link,
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 0aee2392dd29..a14a5ea2bffd 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -8,7 +8,7 @@
* Copyright 2007, Michael Wu <flamingice@xxxxxxxxxxxx>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright (C) 2015 - 2017 Intel Deutschland GmbH
- * Copyright (C) 2018 - 2022 Intel Corporation
+ * Copyright (C) 2018 - 2023 Intel Corporation
*/
#include <linux/delay.h>
@@ -88,6 +88,141 @@ MODULE_PARM_DESC(probe_wait_ms,
*/
#define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
+struct ieee80211_per_bw_puncturing_values {
+ u8 len;
+ const u16 *valid_values;
+};
+
+static const u16 puncturing_values_80mhz[] = {
+ 0x8, 0x4, 0x2, 0x1
+};
+
+static const u16 puncturing_values_160mhz[] = {
+ 0x80, 0x40, 0x20, 0x10, 0x8, 0x4, 0x2, 0x1, 0xc0, 0x30, 0xc, 0x3
+};
+
+static const u16 puncturing_values_320mhz[] = {
+ 0xc000, 0x3000, 0xc00, 0x300, 0xc0, 0x30, 0xc, 0x3, 0xf000, 0xf00,
+ 0xf0, 0xf, 0xfc00, 0xf300, 0xf0c0, 0xf030, 0xf00c, 0xf003, 0xc00f,
+ 0x300f, 0xc0f, 0x30f, 0xcf, 0x3f
+};
+
+#define IEEE80211_PER_BW_VALID_PUNCTURING_VALUES(_bw) \
+ { \
+ .len = ARRAY_SIZE(puncturing_values_ ## _bw ## mhz), \
+ .valid_values = puncturing_values_ ## _bw ## mhz \
+ }
+
+static const struct ieee80211_per_bw_puncturing_values per_bw_puncturing[] = {
+ IEEE80211_PER_BW_VALID_PUNCTURING_VALUES(80),
+ IEEE80211_PER_BW_VALID_PUNCTURING_VALUES(160),
+ IEEE80211_PER_BW_VALID_PUNCTURING_VALUES(320)
+};
+
+static bool ieee80211_valid_disable_subchannel_bitmap(u16 *bitmap,
+ enum nl80211_chan_width bw)
+{
+ u32 idx, i;
+
+ switch (bw) {
+ case NL80211_CHAN_WIDTH_80:
+ idx = 0;
+ break;
+ case NL80211_CHAN_WIDTH_160:
+ idx = 1;
+ break;
+ case NL80211_CHAN_WIDTH_320:
+ idx = 2;
+ break;
+ default:
+ *bitmap = 0;
+ break;
+ }
+
+ if (!*bitmap)
+ return true;
+
+ for (i = 0; i < per_bw_puncturing[idx].len; i++)
+ if (per_bw_puncturing[idx].valid_values[i] == *bitmap)
+ return true;
+
+ return false;
+}
+
+/*
+ * Extract from the given disabled subchannel bitmap (raw format
+ * from the EHT Operation Element) the bits for the subchannel
+ * we're using right now.
+ */
+static u16
+ieee80211_extract_dis_subch_bmap(const struct ieee80211_eht_operation *eht_oper,
+ struct cfg80211_chan_def *chandef, u16 bitmap)
+{
+ struct ieee80211_eht_operation_info *info = (void *)eht_oper->optional;
+ struct cfg80211_chan_def ap_chandef = *chandef;
+ u32 ap_center_freq, local_center_freq;
+ u32 ap_bw, local_bw;
+ int ap_start_freq, local_start_freq;
+ u16 shift, mask;
+
+ if (!(eht_oper->params & IEEE80211_EHT_OPER_INFO_PRESENT) ||
+ !(eht_oper->params &
+ IEEE80211_EHT_OPER_DISABLED_SUBCHANNEL_BITMAP_PRESENT))
+ return 0;
+
+ /* set 160/320 supported to get the full AP definition */
+ ieee80211_chandef_eht_oper(eht_oper, true, true, &ap_chandef);
+ ap_center_freq = ap_chandef.center_freq1;
+ ap_bw = 20 * BIT(u8_get_bits(info->control,
+ IEEE80211_EHT_OPER_CHAN_WIDTH));
+ ap_start_freq = ap_center_freq - ap_bw / 2;
+ local_center_freq = chandef->center_freq1;
+ local_bw = 20 * BIT(ieee80211_chan_width_to_rx_bw(chandef->width));
+ local_start_freq = local_center_freq - local_bw / 2;
+ shift = (local_start_freq - ap_start_freq) / 20;
+ mask = BIT(local_bw / 20) - 1;
+
+ return (bitmap >> shift) & mask;
+}
+
+/*
+ * Handle the puncturing bitmap, possibly downgrading bandwidth to get a
+ * valid bitmap.
+ */
+static void
+ieee80211_handle_puncturing_bitmap(struct ieee80211_link_data *link,
+ const struct ieee80211_eht_operation *eht_oper,
+ u16 bitmap, u64 *changed)
+{
+ struct cfg80211_chan_def *chandef = &link->conf->chandef;
+ u16 extracted;
+ u64 _changed = 0;
+
+ if (!changed)
+ changed = &_changed;
+
+ while (chandef->width > NL80211_CHAN_WIDTH_40) {
+ extracted =
+ ieee80211_extract_dis_subch_bmap(eht_oper, chandef,
+ bitmap);
+
+ if (ieee80211_valid_disable_subchannel_bitmap(&bitmap,
+ chandef->width))
+ break;
+ link->u.mgd.conn_flags |=
+ ieee80211_chandef_downgrade(chandef);
+ *changed |= BSS_CHANGED_BANDWIDTH;
+ }
+
+ if (chandef->width <= NL80211_CHAN_WIDTH_40)
+ extracted = 0;
+
+ if (link->conf->eht_puncturing != extracted) {
+ link->conf->eht_puncturing = extracted;
+ *changed |= BSS_CHANGED_EHT_PUNCTURING;
+ }
+}
+
/*
* We can have multiple work items (and connection probing)
* scheduling this timer, but we need to take care to only
@@ -413,7 +548,7 @@ static int ieee80211_config_bw(struct ieee80211_link_data *link,
const struct ieee80211_he_operation *he_oper,
const struct ieee80211_eht_operation *eht_oper,
const struct ieee80211_s1g_oper_ie *s1g_oper,
- const u8 *bssid, u32 *changed)
+ const u8 *bssid, u64 *changed)
{
struct ieee80211_sub_if_data *sdata = link->sdata;
struct ieee80211_local *local = sdata->local;
@@ -4145,6 +4280,7 @@ static bool ieee80211_assoc_config_link(struct ieee80211_link_data *link,
link_sta);
bss_conf->eht_support = link_sta->pub->eht_cap.has_eht;
+ *changed |= BSS_CHANGED_EHT_PUNCTURING;
} else {
bss_conf->eht_support = false;
}
@@ -5477,6 +5613,45 @@ static bool ieee80211_rx_our_beacon(const u8 *tx_bssid,
return ether_addr_equal(tx_bssid, bss->transmitted_bss->bssid);
}
+static bool ieee80211_config_puncturing(struct ieee80211_link_data *link,
+ const struct ieee80211_eht_operation *eht_oper,
+ u64 *changed)
+{
+ u16 bitmap = 0, extracted;
+
+ if ((eht_oper->params & IEEE80211_EHT_OPER_INFO_PRESENT) &&
+ (eht_oper->params &
+ IEEE80211_EHT_OPER_DISABLED_SUBCHANNEL_BITMAP_PRESENT)) {
+ const struct ieee80211_eht_operation_info *info =
+ (void *)eht_oper->optional;
+ const u8 *disable_subchannel_bitmap = info->optional;
+
+ bitmap = get_unaligned_le16(disable_subchannel_bitmap);
+ }
+
+ extracted = ieee80211_extract_dis_subch_bmap(eht_oper,
+ &link->conf->chandef,
+ bitmap);
+
+ /* accept if there are no changes */
+ if (!(*changed & BSS_CHANGED_BANDWIDTH) &&
+ extracted == link->conf->eht_puncturing)
+ return true;
+
+ if (!ieee80211_valid_disable_subchannel_bitmap(&bitmap,
+ link->conf->chandef.width)) {
+ link_info(link,
+ "Got an invalid disable subchannel bitmap from AP %pM: bitmap = 0x%x, bw = 0x%x. disconnect\n",
+ link->u.mgd.bssid,
+ bitmap,
+ link->conf->chandef.width);
+ return false;
+ }
+
+ ieee80211_handle_puncturing_bitmap(link, eht_oper, bitmap, changed);
+ return true;
+}
+
static void ieee80211_rx_mgmt_beacon(struct ieee80211_link_data *link,
struct ieee80211_hdr *hdr, size_t len,
struct ieee80211_rx_status *rx_status)
@@ -5494,7 +5669,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_link_data *link,
struct ieee80211_channel *chan;
struct link_sta_info *link_sta;
struct sta_info *sta;
- u32 changed = 0;
+ u64 changed = 0;
bool erp_valid;
u8 erp_value = 0;
u32 ncrc = 0;
@@ -5791,6 +5966,21 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_link_data *link,
elems->pwr_constr_elem,
elems->cisco_dtpc_elem);
+ if (elems->eht_operation &&
+ !(link->u.mgd.conn_flags & IEEE80211_CONN_DISABLE_EHT)) {
+ if (!ieee80211_config_puncturing(link, elems->eht_operation,
+ &changed)) {
+ ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
+ WLAN_REASON_DEAUTH_LEAVING,
+ true, deauth_buf);
+ ieee80211_report_disconnect(sdata, deauth_buf,
+ sizeof(deauth_buf), true,
+ WLAN_REASON_DEAUTH_LEAVING,
+ false);
+ goto free;
+ }
+ }
+
ieee80211_link_info_change_notify(sdata, link, changed);
free:
kfree(elems);
@@ -6892,9 +7082,12 @@ ieee80211_setup_assoc_link(struct ieee80211_sub_if_data *sdata,
ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
}
+ link->conf->eht_puncturing = 0;
+
rcu_read_lock();
beacon_ies = rcu_dereference(cbss->beacon_ies);
if (beacon_ies) {
+ const struct ieee80211_eht_operation *eht_oper;
const struct element *elem;
u8 dtim_count = 0;
@@ -6923,6 +7116,31 @@ ieee80211_setup_assoc_link(struct ieee80211_sub_if_data *sdata,
link->conf->ema_ap = true;
else
link->conf->ema_ap = false;
+
+ elem = cfg80211_find_ext_elem(WLAN_EID_EXT_EHT_OPERATION,
+ beacon_ies->data, beacon_ies->len);
+ eht_oper = (const void *)(elem->data + 1);
+
+ if (elem &&
+ ieee80211_eht_oper_size_ok((const void *)(elem->data + 1),
+ elem->datalen - 1) &&
+ (eht_oper->params & IEEE80211_EHT_OPER_INFO_PRESENT) &&
+ (eht_oper->params & IEEE80211_EHT_OPER_DISABLED_SUBCHANNEL_BITMAP_PRESENT)) {
+ const struct ieee80211_eht_operation_info *info =
+ (void *)eht_oper->optional;
+ const u8 *disable_subchannel_bitmap = info->optional;
+ u16 bitmap;
+
+ bitmap = get_unaligned_le16(disable_subchannel_bitmap);
+ if (ieee80211_valid_disable_subchannel_bitmap(&bitmap,
+ link->conf->chandef.width))
+ ieee80211_handle_puncturing_bitmap(link,
+ eht_oper,
+ bitmap,
+ NULL);
+ else
+ conn_flags |= IEEE80211_CONN_DISABLE_EHT;
+ }
}
rcu_read_unlock();
