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[wireless-next,14/15] wifi: cfg80211/mac80211: implement dot11ExtendedRegInfoSupport

Message ID 20250609213232.90cdef116aad.I85da390fbee59355e3855691933e6a5e55c47ac4@changeid
State New
Headers show
Series wifi: cfg80211/mac80211: updates - 2025-06-09 | expand

Commit Message

Miri Korenblit June 9, 2025, 6:35 p.m. UTC 
From: Somashekhar Puttagangaiah <somashekhar.puttagangaiah@intel.com>

Implement dot11ExtendedRegInfoSupport to advertise non-AP station
regulatory power capability as part of regulatory connectivity
element in (Re)Association request frames so that AP can achieve
maximum client connectivity. Control field which was interpreted
using value of 3-bits B5 to B3, now uses value of 4-bits B6 to B3 to
interpret the type of AP. Hence update IEEE80211_HE_6GHZ_OPER_CTRL_REG_INFO
to parse 4-bits control field. If older AP still updates only 3-bits
value of control field, station can still interpret the value as per
section E.2.7 of IEEE 802.11 REVme D7.0 and support the appropriate
AP type.

Also update IEEE80211_6GHZ_CTRL_REG_INDOOR_SP_AP as the value of
standard power AP is changed to 8 instead of 4 so that AP can support both
LPI AP and SP AP to maximize the connectivity with stations. For backward
compatibility, keeping value 4 as old AP by limiting it to SP AP only.

Signed-off-by: Somashekhar Puttagangaiah <somashekhar.puttagangaiah@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
---
 include/linux/ieee80211.h  | 34 +++++++++++++++++++++++++------
 net/mac80211/ieee80211_i.h |  2 ++
 net/mac80211/mlme.c        | 41 ++++++++++++++++++++++++++++++++++++++
 net/mac80211/util.c        | 17 ++++++++++++++++
 net/wireless/scan.c        |  1 +
 5 files changed, 89 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 599137c2c091..1d9bcceb746a 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -2778,11 +2778,12 @@  static inline bool ieee80211_he_capa_size_ok(const u8 *data, u8 len)
 #define IEEE80211_HE_OPERATION_PARTIAL_BSS_COLOR		0x40000000
 #define IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED		0x80000000
 
-#define IEEE80211_6GHZ_CTRL_REG_LPI_AP		0
-#define IEEE80211_6GHZ_CTRL_REG_SP_AP		1
-#define IEEE80211_6GHZ_CTRL_REG_VLP_AP		2
-#define IEEE80211_6GHZ_CTRL_REG_INDOOR_LPI_AP	3
-#define IEEE80211_6GHZ_CTRL_REG_INDOOR_SP_AP	4
+#define IEEE80211_6GHZ_CTRL_REG_LPI_AP			0
+#define IEEE80211_6GHZ_CTRL_REG_SP_AP			1
+#define IEEE80211_6GHZ_CTRL_REG_VLP_AP			2
+#define IEEE80211_6GHZ_CTRL_REG_INDOOR_LPI_AP		3
+#define IEEE80211_6GHZ_CTRL_REG_INDOOR_SP_AP_OLD	4
+#define IEEE80211_6GHZ_CTRL_REG_INDOOR_SP_AP		8
 
 /**
  * struct ieee80211_he_6ghz_oper - HE 6 GHz operation Information field
@@ -2800,13 +2801,31 @@  struct ieee80211_he_6ghz_oper {
 #define		IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_80MHZ	2
 #define		IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_160MHZ	3
 #define IEEE80211_HE_6GHZ_OPER_CTRL_DUP_BEACON	0x4
-#define IEEE80211_HE_6GHZ_OPER_CTRL_REG_INFO	0x38
+#define IEEE80211_HE_6GHZ_OPER_CTRL_REG_INFO	0x78
 	u8 control;
 	u8 ccfs0;
 	u8 ccfs1;
 	u8 minrate;
 } __packed;
 
+/**
+ * enum ieee80211_reg_conn_bits - represents Regulatory connectivity field bits.
+ *
+ * This enumeration defines bit flags used to represent regulatory connectivity
+ * field bits.
+ *
+ * @IEEE80211_REG_CONN_LPI_BIT_VALID: Indicates whether the LPI bit is valid.
+ * @IEEE80211_REG_CONN_LPI_BIT_VALUE: Represents the value of the LPI bit.
+ * @IEEE80211_REG_CONN_SP_BIT_VALID: Indicates whether the SP bit is valid.
+ * @IEEE80211_REG_CONN_SP_BIT_VALUE: Represents the value of the SP bit.
+ */
+enum ieee80211_reg_conn_bits {
+	IEEE80211_REG_CONN_LPI_VALID = BIT(0),
+	IEEE80211_REG_CONN_LPI_VALUE = BIT(1),
+	IEEE80211_REG_CONN_SP_VALID = BIT(2),
+	IEEE80211_REG_CONN_SP_VALUE = BIT(3),
+};
+
 /* transmit power interpretation type of transmit power envelope element */
 enum ieee80211_tx_power_intrpt_type {
 	IEEE80211_TPE_LOCAL_EIRP,
@@ -3788,6 +3807,7 @@  enum ieee80211_eid_ext {
 	WLAN_EID_EXT_FILS_PUBLIC_KEY = 12,
 	WLAN_EID_EXT_FILS_NONCE = 13,
 	WLAN_EID_EXT_FUTURE_CHAN_GUIDANCE = 14,
+	WLAN_EID_EXT_DH_PARAMETER = 32,
 	WLAN_EID_EXT_HE_CAPABILITY = 35,
 	WLAN_EID_EXT_HE_OPERATION = 36,
 	WLAN_EID_EXT_UORA = 37,
@@ -3811,6 +3831,8 @@  enum ieee80211_eid_ext {
 	WLAN_EID_EXT_EHT_CAPABILITY = 108,
 	WLAN_EID_EXT_TID_TO_LINK_MAPPING = 109,
 	WLAN_EID_EXT_BANDWIDTH_INDICATION = 135,
+	WLAN_EID_EXT_KNOWN_STA_IDENTIFCATION = 136,
+	WLAN_EID_EXT_NON_AP_STA_REG_CON = 137,
 };
 
 /* Action category code */
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 30809f0b35f7..b4c42095a46a 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -2638,6 +2638,8 @@  int ieee80211_put_eht_cap(struct sk_buff *skb,
 			  struct ieee80211_sub_if_data *sdata,
 			  const struct ieee80211_supported_band *sband,
 			  const struct ieee80211_conn_settings *conn);
+int ieee80211_put_reg_conn(struct sk_buff *skb,
+			   enum ieee80211_channel_flags flags);
 
 /* channel management */
 bool ieee80211_chandef_ht_oper(const struct ieee80211_ht_operation *ht_oper,
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index d18a7a7e33c3..8a86e5bc152b 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1641,6 +1641,30 @@  static size_t ieee80211_add_before_he_elems(struct sk_buff *skb,
 	return noffset;
 }
 
+static size_t ieee80211_add_before_reg_conn(struct sk_buff *skb,
+					    const u8 *elems, size_t elems_len,
+					    size_t offset)
+{
+	static const u8 before_reg_conn[] = {
+		/*
+		 * no need to list the ones split off before HE
+		 * or generated here
+		 */
+		WLAN_EID_EXTENSION, WLAN_EID_EXT_DH_PARAMETER,
+		WLAN_EID_EXTENSION, WLAN_EID_EXT_KNOWN_STA_IDENTIFCATION,
+	};
+	size_t noffset;
+
+	if (!elems_len)
+		return offset;
+
+	noffset = ieee80211_ie_split(elems, elems_len, before_reg_conn,
+				     ARRAY_SIZE(before_reg_conn), offset);
+	skb_put_data(skb, elems + offset, noffset - offset);
+
+	return noffset;
+}
+
 #define PRESENT_ELEMS_MAX	8
 #define PRESENT_ELEM_EXT_OFFS	0x100
 
@@ -1801,6 +1825,22 @@  ieee80211_add_link_elems(struct ieee80211_sub_if_data *sdata,
 		ieee80211_put_he_6ghz_cap(skb, sdata, smps_mode);
 	}
 
+	/*
+	 * if present, add any custom IEs that go before regulatory
+	 * connectivity element
+	 */
+	offset = ieee80211_add_before_reg_conn(skb, extra_elems,
+					       extra_elems_len, offset);
+
+	if (sband->band == NL80211_BAND_6GHZ) {
+		/*
+		 * as per Section E.2.7 of IEEE 802.11 REVme D7.0, non-AP STA
+		 * capable of operating on the 6 GHz band shall transmit
+		 * regulatory connectivity element.
+		 */
+		ieee80211_put_reg_conn(skb, chan->flags);
+	}
+
 	/*
 	 * careful - need to know about all the present elems before
 	 * calling ieee80211_assoc_add_ml_elem(), so add this one if
@@ -5924,6 +5964,7 @@  ieee80211_ap_power_type(u8 control)
 		return IEEE80211_REG_LPI_AP;
 	case IEEE80211_6GHZ_CTRL_REG_SP_AP:
 	case IEEE80211_6GHZ_CTRL_REG_INDOOR_SP_AP:
+	case IEEE80211_6GHZ_CTRL_REG_INDOOR_SP_AP_OLD:
 		return IEEE80211_REG_SP_AP;
 	case IEEE80211_6GHZ_CTRL_REG_VLP_AP:
 		return IEEE80211_REG_VLP_AP;
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 27d414efa3fd..85722e206b54 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -2548,6 +2548,23 @@  int ieee80211_put_he_cap(struct sk_buff *skb,
 	return 0;
 }
 
+int ieee80211_put_reg_conn(struct sk_buff *skb,
+			   enum ieee80211_channel_flags flags)
+{
+	u8 reg_conn = IEEE80211_REG_CONN_LPI_VALID |
+		      IEEE80211_REG_CONN_LPI_VALUE |
+		      IEEE80211_REG_CONN_SP_VALID;
+
+	if (!(flags & IEEE80211_CHAN_NO_6GHZ_AFC_CLIENT))
+		reg_conn |= IEEE80211_REG_CONN_SP_VALUE;
+
+	skb_put_u8(skb, WLAN_EID_EXTENSION);
+	skb_put_u8(skb, 1 + sizeof(reg_conn));
+	skb_put_u8(skb, WLAN_EID_EXT_NON_AP_STA_REG_CON);
+	skb_put_u8(skb, reg_conn);
+	return 0;
+}
+
 int ieee80211_put_he_6ghz_cap(struct sk_buff *skb,
 			      struct ieee80211_sub_if_data *sdata,
 			      enum ieee80211_smps_mode smps_mode)
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 6143be6bbd5e..a24b43a44746 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -2231,6 +2231,7 @@  cfg80211_get_6ghz_power_type(const u8 *elems, size_t elems_len)
 		return IEEE80211_REG_LPI_AP;
 	case IEEE80211_6GHZ_CTRL_REG_SP_AP:
 	case IEEE80211_6GHZ_CTRL_REG_INDOOR_SP_AP:
+	case IEEE80211_6GHZ_CTRL_REG_INDOOR_SP_AP_OLD:
 		return IEEE80211_REG_SP_AP;
 	case IEEE80211_6GHZ_CTRL_REG_VLP_AP:
 		return IEEE80211_REG_VLP_AP;