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authorJohannes Berg <johannes@sipsolutions.net>2007-11-16 02:54:53 +0100
committerJohn W. Linville <linville@tuxdriver.com>2007-11-20 16:20:31 -0500
commitc1428b3f45d152a300e4f18638ebf30ceafda6c3 (patch)
treeb20a916281f23052a0001771c95d49d3364960a9 /net
parentb52f2198ac889561d341c6990d669a671f93f450 (diff)
mac80211: fix allmulti/promisc behaviour
When an interface with promisc/allmulti bit is taken down, the mac80211 state can become confused. This fixes it by making mac80211 keep track of all *active* interfaces that have the promisc/allmulti bit set in the sdata, we sync the interface bit into sdata at set_multicast_list() time so this works. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
-rw-r--r--net/mac80211/ieee80211.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index c38e2cd4f7a..59350b8727e 100644
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -267,6 +267,17 @@ static int ieee80211_open(struct net_device *dev)
tasklet_enable(&local->tasklet);
}
+ /*
+ * set_multicast_list will be invoked by the networking core
+ * which will check whether any increments here were done in
+ * error and sync them down to the hardware as filter flags.
+ */
+ if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
+ atomic_inc(&local->iff_allmultis);
+
+ if (sdata->flags & IEEE80211_SDATA_PROMISC)
+ atomic_inc(&local->iff_promiscs);
+
local->open_count++;
netif_start_queue(dev);
@@ -284,6 +295,18 @@ static int ieee80211_stop(struct net_device *dev)
netif_stop_queue(dev);
+ /*
+ * Don't count this interface for promisc/allmulti while it
+ * is down. dev_mc_unsync() will invoke set_multicast_list
+ * on the master interface which will sync these down to the
+ * hardware as filter flags.
+ */
+ if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
+ atomic_dec(&local->iff_allmultis);
+
+ if (sdata->flags & IEEE80211_SDATA_PROMISC)
+ atomic_dec(&local->iff_promiscs);
+
dev_mc_unsync(local->mdev, dev);
/* down all dependent devices, that is VLANs */