Allow authentication frames with a random local address as transmit
address if the driver supports.
This is required for below cases:
- Enabling use of randomized transmit address for PASN authentication
frames improve privacy of WLAN clients.
- To allow user space to use link address indicated by driver as
transmit address for authentication frames triggered by
NL80211_CMD_EXTERNAL_AUTH for MLO connection.
Signed-off-by: Veerendranath Jakkam <quic_vjakkam@xxxxxxxxxxx>
---
include/uapi/linux/nl80211.h | 4 ++++
net/wireless/mlme.c | 11 +++++++++++
2 files changed, 15 insertions(+)
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 279f9715919e..9e665f7b3e23 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -6225,6 +6225,9 @@ enum nl80211_feature_flags {
* @NL80211_EXT_FEATURE_RADAR_BACKGROUND: Device supports background radar/CAC
* detection.
*
+ * @NL80211_EXT_FEATURE_AUTH_TX_RANDOM_TA: Device supports randomized TA
+ * for authentication frames in @NL80211_CMD_FRAME.
+ *
* @NUM_NL80211_EXT_FEATURES: number of extended features.
* @MAX_NL80211_EXT_FEATURES: highest extended feature index.
*/
@@ -6292,6 +6295,7 @@ enum nl80211_ext_feature_index {
NL80211_EXT_FEATURE_BSS_COLOR,
NL80211_EXT_FEATURE_FILS_CRYPTO_OFFLOAD,
NL80211_EXT_FEATURE_RADAR_BACKGROUND,
+ NL80211_EXT_FEATURE_AUTH_TX_RANDOM_TA,
/* add new features before the definition below */
NUM_NL80211_EXT_FEATURES,
diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 2bb4da97b66a..176513a75ddf 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -736,6 +736,16 @@ int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
}
if (!ether_addr_equal(mgmt->sa, wdev_address(wdev))) {
+ /* Allow random TA to be used with authentication frames if the
+ * driver has indicated support for this. Otherwise, only allow
+ * the local address to be used.
+ */
+ if (ieee80211_is_auth(mgmt->frame_control) &&
+ wiphy_ext_feature_isset(
+ &rdev->wiphy,
+ NL80211_EXT_FEATURE_AUTH_TX_RANDOM_TA))
+ goto out_tx;
+
/* Allow random TA to be used with Public Action frames if the
* driver has indicated support for this. Otherwise, only allow
* the local address to be used.
@@ -755,6 +765,7 @@ int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
return -EINVAL;
}
+out_tx:
/* Transmit the Action frame as requested by user space */
return rdev_mgmt_tx(rdev, wdev, params, cookie);
}
--
2.25.1
