mac80211: Filter duplicate IE ids

mac80211 is lenient with respect to reception of corrupted beacons.
Even if the frame is corrupted as a whole, the available IE elements
are still passed back and accepted, sometimes replacing legitimate
data.  It is unknown to what extent this "feature" is made use of,
but it is clear that in some cases, this is detrimental.  One such
case is reported in http://crosbug.com/26832 where an AP corrupts
its beacons but not its probe responses.

One approach would be to completely reject frames with invaid data
(for example, if the last tag extends beyond the end of the enclosing
PDU).  The enclosed approach is much more conservative: we simply
prevent later IEs from overwriting the state from previous ones.
This approach hopes that there might be some salient data in the
IE stream before the corruption, and seeks to at least prevent that
data from being overwritten.  This approach will fix the case above.

Further, we flag element structures that contain data we think might
be corrupted, so that as we fill the mac80211 BSS structure, we try
not to replace data from an un-corrupted probe response with that
of a corrupted beacon, for example.

Short of any statistics gathering in the various forms of AP breakage,
it's not possible to ascertain the side effects of more stringent
discarding of data.

Signed-off-by: Paul Stewart <pstew@chromium.org>
Cc: Sam Leffler <sleffler@chromium.org>
Cc: Eliad Peller <eliad@wizery.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 24cb108..796b13b 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -105,6 +105,44 @@ struct ieee80211_bss {
 	 */
 	bool has_erp_value;
 	u8 erp_value;
+
+	/* Keep track of the corruption of the last beacon/probe response. */
+	u8 corrupt_data;
+
+	/* Keep track of what bits of information we have valid info for. */
+	u8 valid_data;
+};
+
+/**
+ * enum ieee80211_corrupt_data_flags - BSS data corruption flags
+ * @IEEE80211_BSS_CORRUPT_BEACON: last beacon frame received was corrupted
+ * @IEEE80211_BSS_CORRUPT_PROBE_RESP: last probe response received was corrupted
+ *
+ * These are bss flags that are attached to a bss in the
+ * @corrupt_data field of &struct ieee80211_bss.
+ */
+enum ieee80211_bss_corrupt_data_flags {
+	IEEE80211_BSS_CORRUPT_BEACON		= BIT(0),
+	IEEE80211_BSS_CORRUPT_PROBE_RESP	= BIT(1)
+};
+
+/**
+ * enum ieee80211_valid_data_flags - BSS valid data flags
+ * @IEEE80211_BSS_VALID_DTIM: DTIM data was gathered from non-corrupt IE
+ * @IEEE80211_BSS_VALID_WMM: WMM/UAPSD data was gathered from non-corrupt IE
+ * @IEEE80211_BSS_VALID_RATES: Supported rates were gathered from non-corrupt IE
+ * @IEEE80211_BSS_VALID_ERP: ERP flag was gathered from non-corrupt IE
+ *
+ * These are bss flags that are attached to a bss in the
+ * @valid_data field of &struct ieee80211_bss.  They show which parts
+ * of the data structure were recieved as a result of an un-corrupted
+ * beacon/probe response.
+ */
+enum ieee80211_bss_valid_data_flags {
+	IEEE80211_BSS_VALID_DTIM		= BIT(0),
+	IEEE80211_BSS_VALID_WMM			= BIT(1),
+	IEEE80211_BSS_VALID_RATES		= BIT(2),
+	IEEE80211_BSS_VALID_ERP			= BIT(3)
 };
 
 static inline u8 *bss_mesh_cfg(struct ieee80211_bss *bss)
@@ -1120,6 +1158,9 @@ struct ieee802_11_elems {
 	u8 quiet_elem_len;
 	u8 num_of_quiet_elem;	/* can be more the one */
 	u8 timeout_int_len;
+
+	/* whether a parse error occurred while retrieving these elements */
+	bool parse_error;
 };
 
 static inline struct ieee80211_local *hw_to_local(