Extend cfg80211_rx_unprot_mlme_mgmt() to cover indication of unprotected
Beacon frames in addition to the previously used Deauthentication and
Disassociation frames. The Beacon frame case is quite similar, but has
couple of exceptions: this is used both with fully unprotected and also
incorrectly protected frames and there is a rate limit on the events to
avoid unnecessary flooding netlink events in case something goes wrong.
Signed-off-by: Jouni Malinen <[email protected]>
---
include/net/cfg80211.h | 10 ++++++++--
include/uapi/linux/nl80211.h | 7 +++++++
net/wireless/nl80211.c | 13 +++++++++++--
net/wireless/sme.c | 2 ++
4 files changed, 28 insertions(+), 4 deletions(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index c78bd4ff9e33..66da62d49876 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -5111,6 +5111,8 @@ struct wireless_dev {
struct list_head pmsr_list;
spinlock_t pmsr_lock;
struct work_struct pmsr_free_wk;
+
+ unsigned long unprot_beacon_reported;
};
static inline u8 *wdev_address(struct wireless_dev *wdev)
@@ -6125,12 +6127,16 @@ void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len);
/**
* cfg80211_rx_unprot_mlme_mgmt - notification of unprotected mlme mgmt frame
* @dev: network device
- * @buf: deauthentication frame (header + body)
+ * @buf: received management frame (header + body)
* @len: length of the frame data
*
* This function is called whenever a received deauthentication or dissassoc
* frame has been dropped in station mode because of MFP being used but the
- * frame was not protected. This function may sleep.
+ * frame was not protected. This is also used to notify reception of a Beacon
+ * frame that was dropped because it did not include a valid MME MIC while
+ * beacon protection was enabled (BIGTK configured in station mode).
+ *
+ * This function may sleep.
*/
void cfg80211_rx_unprot_mlme_mgmt(struct net_device *dev,
const u8 *buf, size_t len);
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 2b691161830f..afdd9802ccb8 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -1151,6 +1151,11 @@
* @NL80211_CMD_SET_TID_CONFIG: Data frame TID specific configuration
* is passed using %NL80211_ATTR_TID_CONFIG attribute.
*
+ * @NL80211_CMD_UNPROT_BEACON: Unprotected or incorrectly protected Beacon
+ * frame. This event is used to indicate that a received Beacon frame was
+ * dropped because it did not include a valid MME MIC while beacon
+ * protection was enabled (BIGTK configured in station mode).
+ *
* @NL80211_CMD_MAX: highest used command number
* @__NL80211_CMD_AFTER_LAST: internal use
*/
@@ -1377,6 +1382,8 @@ enum nl80211_commands {
NL80211_CMD_SET_TID_CONFIG,
+ NL80211_CMD_UNPROT_BEACON,
+
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index ad87e9db9a91..b68bc628585d 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -15544,10 +15544,19 @@ void cfg80211_rx_unprot_mlme_mgmt(struct net_device *dev, const u8 *buf,
if (WARN_ON(len < 2))
return;
- if (ieee80211_is_deauth(mgmt->frame_control))
+ if (ieee80211_is_deauth(mgmt->frame_control)) {
cmd = NL80211_CMD_UNPROT_DEAUTHENTICATE;
- else
+ } else if (ieee80211_is_disassoc(mgmt->frame_control)) {
cmd = NL80211_CMD_UNPROT_DISASSOCIATE;
+ } else if (ieee80211_is_beacon(mgmt->frame_control)) {
+ if (wdev->unprot_beacon_reported &&
+ elapsed_jiffies_msecs(wdev->unprot_beacon_reported) < 10000)
+ return;
+ cmd = NL80211_CMD_UNPROT_BEACON;
+ wdev->unprot_beacon_reported = jiffies;
+ } else {
+ return;
+ }
trace_cfg80211_rx_unprot_mlme_mgmt(dev, buf, len);
nl80211_send_mlme_event(rdev, dev, buf, len, cmd, GFP_ATOMIC, -1,
diff --git a/net/wireless/sme.c b/net/wireless/sme.c
index ac3e60aa1fc8..3554c0d951f4 100644
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -694,6 +694,7 @@ void __cfg80211_connect_result(struct net_device *dev,
return;
}
+ wdev->unprot_beacon_reported = 0;
nl80211_send_connect_result(wiphy_to_rdev(wdev->wiphy), dev, cr,
GFP_KERNEL);
@@ -921,6 +922,7 @@ void __cfg80211_roamed(struct wireless_dev *wdev,
cfg80211_hold_bss(bss_from_pub(info->bss));
wdev->current_bss = bss_from_pub(info->bss);
+ wdev->unprot_beacon_reported = 0;
nl80211_send_roamed(wiphy_to_rdev(wdev->wiphy),
wdev->netdev, info, GFP_KERNEL);
--
2.20.1