[PATCH] mac80211: allow drivers to report (non-)monitor frames

[Grzegorz Bajorski <grzegorz.bajorski@xxxxxxxxx>]

This allows drivers to tell mac80211 whether given
frame is to be processed regularly but skip
monitor interface delivery or vice versa.

Signed-off-by: Grzegorz Bajorski <grzegorz.bajorski@xxxxxxxxx>
---
 include/net/mac80211.h | 11 +++++++++++
 net/mac80211/rx.c      |  5 +++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 7c30faf..a35e584 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1014,6 +1014,14 @@ ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info)
  * @RX_FLAG_AMPDU_DELIM_CRC_KNOWN: The delimiter CRC field is known (the CRC
  *	is stored in the @ampdu_delimiter_crc field)
  * @RX_FLAG_LDPC: LDPC was used
+ * @RX_FLAG_ONLY_MONITOR: Report frame only to monitor interfaces without
+ *	processing it in any regular way.
+ *	This is useful if drivers offload some frames but still want to report
+ *	them for sniffing purposes.
+ * @RX_FLAG_SKIP_MONITOR: Process and report frame to all interfaces except
+ *	monitor interfaces.
+ *	This is useful if drivers offload some frames but still want to report
+ *	them for sniffing purposes.
  * @RX_FLAG_STBC_MASK: STBC 2 bit bitmask. 1 - Nss=1, 2 - Nss=2, 3 - Nss=3
  * @RX_FLAG_10MHZ: 10 MHz (half channel) was used
  * @RX_FLAG_5MHZ: 5 MHz (quarter channel) was used
@@ -1054,6 +1062,8 @@ enum mac80211_rx_flags {
 	RX_FLAG_MACTIME_END		= BIT(21),
 	RX_FLAG_VHT			= BIT(22),
 	RX_FLAG_LDPC			= BIT(23),
+	RX_FLAG_ONLY_MONITOR		= BIT(24),
+	RX_FLAG_SKIP_MONITOR		= BIT(25),
 	RX_FLAG_STBC_MASK		= BIT(26) | BIT(27),
 	RX_FLAG_10MHZ			= BIT(28),
 	RX_FLAG_5MHZ			= BIT(29),
@@ -1072,6 +1082,7 @@ enum mac80211_rx_flags {
  * @RX_VHT_FLAG_160MHZ: 160 MHz was used
  * @RX_VHT_FLAG_BF: packet was beamformed
  */
+
 enum mac80211_rx_vht_flags {
 	RX_VHT_FLAG_80MHZ		= BIT(0),
 	RX_VHT_FLAG_160MHZ		= BIT(1),
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 1f82753..43ad7a5 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -122,7 +122,8 @@ static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
 	hdr = (void *)(skb->data + rtap_vendor_space);
 
 	if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
-			    RX_FLAG_FAILED_PLCP_CRC))
+			    RX_FLAG_FAILED_PLCP_CRC |
+			    RX_FLAG_ONLY_MONITOR))
 		return true;
 
 	if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
@@ -507,7 +508,7 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 		return NULL;
 	}
 
-	if (!local->monitors) {
+	if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 		if (should_drop_frame(origskb, present_fcs_len,
 				      rtap_vendor_space)) {
 			dev_kfree_skb(origskb);
-- 
2.3.7

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