mac80211: Add support for hardware ARP query filtering

Some hardware allow extended filtering of ARP frames not intended for
the host. To perform such filtering, the hardware needs to know the current
IP address(es) of the host, bound to its interface.

Add support for ARP filtering to mac80211 by adding a new op to the driver
interface, allowing to configure the current IP addresses. This op is called
upon association with the currently configured address(es), and when
associated whenever the IP address(es) change.

This patch adds configuration of IPv4 addresses only, as IPv6 addresses don't
need ARP filtering.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 29c3a75a7ad0..7e720133358c 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -2078,8 +2078,17 @@ static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
                         cfg80211_send_assoc_timeout(wk->sdata->dev,
                                                     wk->filter_ta);
                         return WORK_DONE_DESTROY;
+                } else {
+                        mutex_unlock(&wk->sdata->u.mgd.mtx);
+
+                        /*
+                         * configure ARP filter IP addresses to the driver,
+                         * intentionally outside the mgd mutex.
+                         */
+                        rtnl_lock();
+                        ieee80211_set_arp_filter(wk->sdata);
+                        rtnl_unlock();
                 }
-                mutex_unlock(&wk->sdata->u.mgd.mtx);
         }
 
         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);