[PATCH] mac80211: revamp interface and filter configuration

Drivers are currently supposed to keep track of monitor
interfaces if they allow so-called "hard" monitor, and
they are also supposed to keep track of multicast etc.

This patch changes that, replaces the set_multicast_list()
callback with a new configure_filter() callback that takes
filter flags (FIF_*) instead of interface flags (IFF_*).
For a driver, this means it should open the filter as much
as necessary to get all frames requested by the filter flags.
Accordingly, the filter flags are named "positively", e.g.
FIF_ALLMULTI.

Multicast filtering is a bit special in that drivers that
have no multicast address filters need to allow multicast
frames through when either the FIF_ALLMULTI flag is set or
when the mc_count value is positive.

At the same time, drivers are no longer notified about
monitor interfaces at all, this means they now need to
implement the start() and stop() callbacks and the new
change_filter_flags() callback. Also, the start()/stop()
ordering changed, start() is now called *before* any
add_interface() as it really should be, and stop() after
any remove_interface().

The patch also changes the behaviour of setting the bssid
to multicast for scanning when IEEE80211_HW_NO_PROBE_FILTERING
is set; the IEEE80211_HW_NO_PROBE_FILTERING flag is removed
and the filter flag FIF_BCN_PRBRESP_PROMISC introduced.
This is a lot more efficient for hardware like b43 that
supports it and other hardware can still set the BSSID
to all-ones.

Driver modifications by Johannes Berg (b43 & iwlwifi), Michael Wu
(rtl8187, adm8211, and p54), Larry Finger (b43legacy), and
Ivo van Doorn (rt2x00).

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Michael Wu <flamingice@sourmilk.net>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 4 insertions, 11 deletions

diff --git a/drivers/net/wireless/b43/b43.h b/drivers/net/wireless/b43/b43.h
index a22435ade8ca..2c8fa1c3465e 100644
--- a/drivers/net/wireless/b43/b43.h
+++ b/drivers/net/wireless/b43/b43.h
@@ -604,9 +604,8 @@ struct b43_wl {
          * at a time. General information about this interface follows.
          */
 
-        /* Opaque ID of the operating interface (!= monitor
-         * interface) from the ieee80211 subsystem.
-         * Do not modify.
+        /* Opaque ID of the operating interface from the ieee80211
+         * subsystem. Do not modify.
          */
         int if_id;
         /* The MAC address of the operating interface. */
@@ -615,14 +614,10 @@ struct b43_wl {
         u8 bssid[ETH_ALEN];
         /* Interface type. (IEEE80211_IF_TYPE_XXX) */
         int if_type;
-        /* Counter of active monitor interfaces. */
-        int monitor;
         /* Is the card operating in AP, STA or IBSS mode? */
         bool operating;
-        /* Promisc mode active?
-         * Note that (monitor != 0) implies promisc.
-         */
-        bool promisc;
+        /* filter flags */
+        unsigned int filter_flags;
         /* Stats about the wireless interface */
         struct ieee80211_low_level_stats ieee_stats;
 
@@ -779,8 +774,6 @@ static inline struct b43_wldev *dev_to_b43_wldev(struct device *dev)
 /* Is the device operating in a specified mode (IEEE80211_IF_TYPE_XXX). */
 static inline int b43_is_mode(struct b43_wl *wl, int type)
 {
-        if (type == IEEE80211_IF_TYPE_MNTR)
-                return !!(wl->monitor);
         return (wl->operating && wl->if_type == type);
 }