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authorJohannes Berg <johannes.berg@intel.com>2011-05-09 20:41:15 +0400
committerJohn W. Linville <linville@tuxdriver.com>2011-05-12 22:10:47 +0400
commit56d1893d94bc06d0b1aa3a53f924ed02f9e207bf (patch)
tree90862ae6788cf267631bd9ddebf4bc450d0d2b26 /net/wireless/util.c
parent15cb309614f35df344b9f06a9ea9f077d1e449db (diff)
downloadlinux-56d1893d94bc06d0b1aa3a53f924ed02f9e207bf.tar.xz
cfg80211: restrict AP beacon intervals
Multiple virtual AP interfaces can currently try to use different beacon intervals, but that just leads to problems since it won't actually be done that way by drivers. Return an error in this case to make sure it won't be done wrong. Also, ignore attempts to change the DTIM period or beacon interval during the lifetime of the BSS. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/wireless/util.c')
-rw-r--r--net/wireless/util.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 6a750bc6bcfe..414c9f604df6 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -896,3 +896,28 @@ u16 cfg80211_calculate_bitrate(struct rate_info *rate)
/* do NOT round down here */
return (bitrate + 50000) / 100000;
}
+
+int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
+ u32 beacon_int)
+{
+ struct wireless_dev *wdev;
+ int res = 0;
+
+ if (!beacon_int)
+ return -EINVAL;
+
+ mutex_lock(&rdev->devlist_mtx);
+
+ list_for_each_entry(wdev, &rdev->netdev_list, list) {
+ if (!wdev->beacon_interval)
+ continue;
+ if (wdev->beacon_interval != beacon_int) {
+ res = -EINVAL;
+ break;
+ }
+ }
+
+ mutex_unlock(&rdev->devlist_mtx);
+
+ return res;
+}