On Friday 27 April 2007 15:49, Michael Wu wrote: > On Friday 27 April 2007 13:40, Jiri Benc wrote: > > I agree. > > > > And I'd like to see some way to disable this feature for sane cards. > > Here you go. > > Thanks, > -Michael Wu And here's one that *really* works. Thanks, -Michael Wu
mac80211: set bssid to broadcast before scan
From: Michael Wu <flamingice@xxxxxxxxxxxx>
This patch sets the BSSID to broadcast before scanning to ensure that the
hardware filter does not filter probe responses.
Signed-off-by: Michael Wu <flamingice@xxxxxxxxxxxx>
---
include/net/mac80211.h | 4 ++++
net/mac80211/ieee80211.c | 7 ++++++-
net/mac80211/ieee80211_sta.c | 11 +++++++++++
3 files changed, 21 insertions(+), 1 deletions(-)
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index cade956..2da0d31 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -524,6 +524,10 @@ struct ieee80211_hw {
* normal operation. */
#define IEEE80211_HW_MONITOR_DURING_OPER (1<<9)
+ /* Device does not need BSSID filter set to broadcast in order to
+ * receive all probe responses while scanning */
+#define IEEE80211_HW_NO_PROBE_FILTERING (1<<10)
+
/* please fill this gap when adding new flags */
/* calculate Michael MIC for an MSDU when doing hwcrypto */
diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index f6a71ce..4976493 100644
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -2015,6 +2015,7 @@ static int __ieee80211_if_config(struct net_device *dev,
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_if_conf conf;
+ static const u8 scan_bssid[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
if (!local->ops->config_interface || !netif_running(dev))
return 0;
@@ -2023,7 +2024,11 @@ static int __ieee80211_if_config(struct net_device *dev,
conf.type = sdata->type;
if (sdata->type == IEEE80211_IF_TYPE_STA ||
sdata->type == IEEE80211_IF_TYPE_IBSS) {
- conf.bssid = sdata->u.sta.bssid;
+ if (local->sta_scanning &&
+ local->scan_dev == dev)
+ conf.bssid = scan_bssid;
+ else
+ conf.bssid = sdata->u.sta.bssid;
conf.ssid = sdata->u.sta.ssid;
conf.ssid_len = sdata->u.sta.ssid_len;
conf.generic_elem = sdata->u.sta.extra_ie;
diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c
index 7cb2dd3..7b12d7d 100644
--- a/net/mac80211/ieee80211_sta.c
+++ b/net/mac80211/ieee80211_sta.c
@@ -2577,6 +2577,11 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw)
printk(KERN_DEBUG "%s: failed to restore operational"
"channel after scan\n", dev->name);
+ if (!(local->hw.flags & IEEE80211_HW_NO_PROBE_FILTERING))
+ if (ieee80211_if_config(dev))
+ printk(KERN_DEBUG "%s: failed to restore operational"
+ "BSSID after scan\n", dev->name);
+
memset(&wrqu, 0, sizeof(wrqu));
wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
@@ -2736,6 +2741,12 @@ static int ieee80211_sta_start_scan(struct net_device *dev,
list);
local->scan_channel_idx = 0;
local->scan_dev = dev;
+
+ if (!(local->hw.flags & IEEE80211_HW_NO_PROBE_FILTERING))
+ if (ieee80211_if_config(dev))
+ printk(KERN_DEBUG "%s: failed to set BSSID for scan\n",
+ dev->name);
+
/* TODO: start scan as soon as all nullfunc frames are ACKed */
queue_delayed_work(local->hw.workqueue, &local->scan_work,
IEEE80211_CHANNEL_TIME);
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