[PATCH v4 1/5] wifi: nl80211: add roam offload extended feature

From: Carella Chen <[email protected]>

Drivers can offload FT or OKC roaming without necessarily
advertising full 802.1X 4-way handshake offload. Add an extended
feature bit for that capability and allow PMK configuration when it is
present.

This gives userspace a way to provide PMK or PMK-R0 material needed
by firmware roaming implementations while keeping the existing 4-way
handshake offload capability unchanged.

Assisted-by: GitHub Copilot CLI:gpt-5.5
Signed-off-by: Carella Chen <[email protected]>
Signed-off-by: Jason Huang <[email protected]>
---
 include/uapi/linux/nl80211.h | 4 ++++
 net/wireless/nl80211.c       | 4 +++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 020387d76412..9f8d9e3d5990 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -7110,6 +7110,9 @@ enum nl80211_feature_flags {
  * @NL80211_EXT_FEATURE_PROBE_AP: Driver supports probing the associated AP
  *	in STA mode using @NL80211_CMD_PROBE_PEER.
  *
+ * @NL80211_EXT_FEATURE_ROAM_OFFLOAD: Driver supports Fast Transition or
+ *	Opportunistic Key Caching roaming offload in station mode.
+ *
  * @NUM_NL80211_EXT_FEATURES: number of extended features.
  * @MAX_NL80211_EXT_FEATURES: highest extended feature index.
  */
@@ -7192,6 +7195,7 @@ enum nl80211_ext_feature_index {
 	NL80211_EXT_FEATURE_ROC_ADDR_FILTER,
 	NL80211_EXT_FEATURE_SET_KEY_LTF_SEED,
 	NL80211_EXT_FEATURE_PROBE_AP,
+	NL80211_EXT_FEATURE_ROAM_OFFLOAD,
 
 	/* add new features before the definition below */
 	NUM_NL80211_EXT_FEATURES,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 44f2bad08670..492fb567ddb1 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -18443,7 +18443,9 @@ static int nl80211_set_pmk(struct sk_buff *skb, struct genl_info *info)
 		return -EOPNOTSUPP;
 
 	if (!wiphy_ext_feature_isset(&rdev->wiphy,
-				     NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X))
+				     NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
+	    !wiphy_ext_feature_isset(&rdev->wiphy,
+				     NL80211_EXT_FEATURE_ROAM_OFFLOAD))
 		return -EOPNOTSUPP;
 
 	if (!info->attrs[NL80211_ATTR_MAC] || !info->attrs[NL80211_ATTR_PMK])

-- 
2.25.1