[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, 58 insertions, 22 deletions

diff --git a/drivers/net/wireless/p54common.c b/drivers/net/wireless/p54common.c
index b05b5c5b4c04..9befd6cc7911 100644
--- a/drivers/net/wireless/p54common.c
+++ b/drivers/net/wireless/p54common.c
@@ -774,15 +774,39 @@ static void p54_set_vdcf(struct ieee80211_hw *dev)
 	priv->tx(dev, hdr, sizeof(*hdr) + sizeof(*vdcf), 0);
 }
 
+static int p54_start(struct ieee80211_hw *dev)
+{
+	struct p54_common *priv = dev->priv;
+	int err;
+
+	err = priv->open(dev);
+	if (!err)
+		priv->mode = IEEE80211_IF_TYPE_MNTR;
+
+	return err;
+}
+
+static void p54_stop(struct ieee80211_hw *dev)
+{
+	struct p54_common *priv = dev->priv;
+	struct sk_buff *skb;
+	while ((skb = skb_dequeue(&priv->tx_queue))) {
+		struct memrecord *range = (struct memrecord *)&skb->cb;
+		if (range->control)
+			kfree(range->control);
+		kfree_skb(skb);
+	}
+	priv->stop(dev);
+	priv->mode = IEEE80211_IF_TYPE_MGMT;
+}
+
 static int p54_add_interface(struct ieee80211_hw *dev,
 			     struct ieee80211_if_init_conf *conf)
 {
 	struct p54_common *priv = dev->priv;
-	int err;
 
-	/* NOTE: using IEEE80211_IF_TYPE_MGMT to indicate no mode selected */
-	if (priv->mode != IEEE80211_IF_TYPE_MGMT)
-		return -1;
+	if (priv->mode != IEEE80211_IF_TYPE_MNTR)
+		return -EOPNOTSUPP;
 
 	switch (conf->type) {
 	case IEEE80211_IF_TYPE_STA:
@@ -792,23 +816,18 @@ static int p54_add_interface(struct ieee80211_hw *dev,
 		return -EOPNOTSUPP;
 	}
 
-	priv->mac_addr = conf->mac_addr;
-
-	err = priv->open(dev);
-	if (err) {
-		priv->mode = IEEE80211_IF_TYPE_MGMT;
-		skb_queue_purge(&priv->tx_queue);
-		return err;
-	}
+	memcpy(priv->mac_addr, conf->mac_addr, ETH_ALEN);
 
 	p54_set_filter(dev, 0, priv->mac_addr, NULL, 0, 1, 0, 0xF642);
 	p54_set_filter(dev, 0, priv->mac_addr, NULL, 1, 0, 0, 0xF642);
-	p54_set_vdcf(dev);
 
 	switch (conf->type) {
 	case IEEE80211_IF_TYPE_STA:
 		p54_set_filter(dev, 1, priv->mac_addr, NULL, 0, 0x15F, 0x1F4, 0);
 		break;
+	default:
+		BUG();	/* impossible */
+		break;
 	}
 
 	p54_set_leds(dev, 1, 0, 0);
@@ -820,15 +839,9 @@ static void p54_remove_interface(struct ieee80211_hw *dev,
 				 struct ieee80211_if_init_conf *conf)
 {
 	struct p54_common *priv = dev->priv;
-	struct sk_buff *skb;
-	while ((skb = skb_dequeue(&priv->tx_queue))) {
-		struct memrecord *range = (struct memrecord *)&skb->cb;
-		if (range->control)
-			kfree(range->control);
-		kfree_skb(skb);
-	}
-	priv->mode = IEEE80211_IF_TYPE_MGMT;
-	priv->stop(dev);
+	priv->mode = IEEE80211_IF_TYPE_MNTR;
+	memset(priv->mac_addr, 0, ETH_ALEN);
+	p54_set_filter(dev, 0, priv->mac_addr, NULL, 2, 0, 0, 0);
 }
 
 static int p54_config(struct ieee80211_hw *dev, struct ieee80211_conf *conf)
@@ -848,9 +861,29 @@ static int p54_config_interface(struct ieee80211_hw *dev, int if_id,
 	p54_set_filter(dev, 0, priv->mac_addr, conf->bssid, 0, 1, 0, 0xF642);
 	p54_set_filter(dev, 0, priv->mac_addr, conf->bssid, 2, 0, 0, 0);
 	p54_set_leds(dev, 1, !is_multicast_ether_addr(conf->bssid), 0);
+	memcpy(priv->bssid, conf->bssid, ETH_ALEN);
 	return 0;
 }
 
+static void p54_configure_filter(struct ieee80211_hw *dev,
+				 unsigned int changed_flags,
+				 unsigned int *total_flags,
+				 int mc_count, struct dev_mc_list *mclist)
+{
+	struct p54_common *priv = dev->priv;
+
+	*total_flags &= FIF_BCN_PRBRESP_PROMISC;
+
+	if (changed_flags & FIF_BCN_PRBRESP_PROMISC) {
+		if (*total_flags & FIF_BCN_PRBRESP_PROMISC)
+			p54_set_filter(dev, 0, priv->mac_addr,
+				       NULL, 2, 0, 0, 0);
+		else
+			p54_set_filter(dev, 0, priv->mac_addr,
+				       priv->bssid, 2, 0, 0, 0);
+	}
+}
+
 static int p54_conf_tx(struct ieee80211_hw *dev, int queue,
 		       const struct ieee80211_tx_queue_params *params)
 {
@@ -893,10 +926,13 @@ static int p54_get_tx_stats(struct ieee80211_hw *dev,
 
 static const struct ieee80211_ops p54_ops = {
 	.tx			= p54_tx,
+	.start			= p54_start,
+	.stop			= p54_stop,
 	.add_interface		= p54_add_interface,
 	.remove_interface	= p54_remove_interface,
 	.config			= p54_config,
 	.config_interface	= p54_config_interface,
+	.configure_filter	= p54_configure_filter,
 	.conf_tx		= p54_conf_tx,
 	.get_stats		= p54_get_stats,
 	.get_tx_stats		= p54_get_tx_stats