iwlwifi: mvm: add basic bcast filtering implementation

Broadcast filtering allows dropping broadcast
frames that don't match the configured patterns.

Use predefined filters, and configure them for
each associated station vif.

There is no need to optimize and attach the same
filter to multiple vifs, as a following patch
will configure each filter to have per-vif unique
values.

Configure the bcast filtering on assoc changes.

Add a new IWLWIFI_BCAST_FILTERING Kconfig option
in order to enable broadcast filtering.

Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/Kconfig b/drivers/net/wireless/iwlwifi/Kconfig
index 3eb2102ce236..7fc98814fc2a 100644
--- a/drivers/net/wireless/iwlwifi/Kconfig
+++ b/drivers/net/wireless/iwlwifi/Kconfig
@@ -128,3 +128,16 @@ config IWLWIFI_DEVICE_TRACING
           If unsure, say Y so we can help you better when problems
           occur.
 endmenu
+
+config IWLWIFI_BCAST_FILTERING
+        bool "Enable broadcast filtering"
+        depends on IWLWIFI
+        help
+          Say Y here to enable default bcast filtering configuration.
+
+          Enabling broadcast filtering will drop any incoming wireless
+          broadcast frames, except some very specific predefined
+          patterns (e.g. incoming arp requests).
+
+          If unsure, don't enable this option, as some programs might
+          expect incoming broadcasts for their normal operations.