wifi: nl80211: permit userspace to pass supported selectors

Currently the SAE_H2E selector already exists, which needs to be
implemented by the SME. As new such selectors might be added in the
future, add a feature to permit userspace to report a selector as
supported.

If not given, the kernel should assume that userspace does support
SAE_H2E.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250101070249.fe67b871cc39.Ieb98390328927e998e612345a58b6dbc00b0e3a2@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 21 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 7790af534b7f..8a38d66be2c9 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3023,6 +3023,10 @@ static inline const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 id)
  *
  * @bss: The BSS to authenticate with, the callee must obtain a reference
  *	to it if it needs to keep it.
+ * @supported_selectors: List of selectors that should be assumed to be
+ *	supported by the station.
+ *	SAE_H2E must be assumed supported if set to %NULL.
+ * @supported_selectors_len: Length of supported_selectors in octets.
  * @auth_type: Authentication type (algorithm)
  * @ie: Extra IEs to add to Authentication frame or %NULL
  * @ie_len: Length of ie buffer in octets
@@ -3045,6 +3049,8 @@ struct cfg80211_auth_request {
 	struct cfg80211_bss *bss;
 	const u8 *ie;
 	size_t ie_len;
+	const u8 *supported_selectors;
+	u8 supported_selectors_len;
 	enum nl80211_auth_type auth_type;
 	const u8 *key;
 	u8 key_len;
@@ -3124,6 +3130,10 @@ enum cfg80211_assoc_req_flags {
  *	included in the Current AP address field of the Reassociation Request
  *	frame.
  * @flags:  See &enum cfg80211_assoc_req_flags
+ * @supported_selectors: supported selectors in IEEE 802.11 format
+ *	(or %NULL for no change).
+ *	If %NULL, then support for SAE_H2E should be assumed.
+ * @supported_selectors_len: Length of supported_selectors in octets.
  * @ht_capa:  HT Capabilities over-rides.  Values set in ht_capa_mask
  *	will be used in ht_capa.  Un-supported values will be ignored.
  * @ht_capa_mask:  The bits of ht_capa which are to be used.
@@ -3150,6 +3160,8 @@ struct cfg80211_assoc_request {
 	struct cfg80211_crypto_settings crypto;
 	bool use_mfp;
 	u32 flags;
+	const u8 *supported_selectors;
+	u8 supported_selectors_len;
 	struct ieee80211_ht_cap ht_capa;
 	struct ieee80211_ht_cap ht_capa_mask;
 	struct ieee80211_vht_cap vht_capa, vht_capa_mask;
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 6d11437596b9..ee1cf19803ea 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2871,6 +2871,12 @@ enum nl80211_commands {
  * @NL80211_ATTR_VIF_RADIO_MASK: Bitmask of allowed radios (u32).
  *	A value of 0 means all radios.
  *
+ * @NL80211_ATTR_SUPPORTED_SELECTORS: supported selectors, array of
+ *	supported selectors as defined by IEEE 802.11 7.3.2.2 but without the
+ *	length restriction (at most %NL80211_MAX_SUPP_SELECTORS).
+ *	This can be used to provide a list of selectors that are implemented
+ *	by the supplicant. If not given, support for SAE_H2E is assumed.
+ *
  * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
@@ -3421,6 +3427,8 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_VIF_RADIO_MASK,
 
+	NL80211_ATTR_SUPPORTED_SELECTORS,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
@@ -3465,6 +3473,7 @@ enum nl80211_attrs {
 #define NL80211_WIPHY_NAME_MAXLEN		64
 
 #define NL80211_MAX_SUPP_RATES			32
+#define NL80211_MAX_SUPP_SELECTORS		128
 #define NL80211_MAX_SUPP_HT_RATES		77
 #define NL80211_MAX_SUPP_REG_RULES		128
 #define NL80211_TKIP_DATA_OFFSET_ENCR_KEY	0