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authorJouni Malinen <j@w1.fi>2010-08-28 19:37:51 +0300
committerJohn W. Linville <linville@tuxdriver.com>2010-09-24 15:54:28 -0400
commit651b52254fc061f02d965524e71de4333a009a5a (patch)
tree5eb085461cc417ca32fe7a8a13f52b231030be86 /net/mac80211/util.c
parent8dcb20038ade81f9a87c024e7f12ec74f0e95f33 (diff)
mac80211: Add DS Parameter Set into Probe Request on 2.4 GHz
IEEE Std 802.11k-2008 added DS Parameter Set information element into Probe Request frames as an optional information on 2.4 GHz band (and mandatory, if radio measurements are enabled). This allows APs to filter out Probe Request frames that may be received from neighboring overlapping channels and by doing so, reduce the number of unnecessary frames in the air. Make mac80211 add this IE into Probe Request frames whenever the channel is known (i.e., whenever hwscan is not used). Signed-off-by: Jouni Malinen <j@w1.fi> Acked-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/util.c')
-rw-r--r--net/mac80211/util.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index bfd19d76667a..aba025d748e9 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -895,7 +895,8 @@ void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
const u8 *ie, size_t ie_len,
- enum ieee80211_band band, u32 rate_mask)
+ enum ieee80211_band band, u32 rate_mask,
+ u8 channel)
{
struct ieee80211_supported_band *sband;
u8 *pos;
@@ -947,6 +948,12 @@ int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
pos += ext_rates_len;
}
+ if (channel && sband->band == IEEE80211_BAND_2GHZ) {
+ *pos++ = WLAN_EID_DS_PARAMS;
+ *pos++ = 1;
+ *pos++ = channel;
+ }
+
/* insert custom IEs that go before HT */
if (ie && ie_len) {
static const u8 before_ht[] = {
@@ -1013,6 +1020,7 @@ void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
struct ieee80211_mgmt *mgmt;
size_t buf_len;
u8 *buf;
+ u8 chan;
/* FIXME: come up with a proper value */
buf = kmalloc(200 + ie_len, GFP_KERNEL);
@@ -1022,10 +1030,14 @@ void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
return;
}
+ chan = ieee80211_frequency_to_channel(
+ local->hw.conf.channel->center_freq);
+
buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
local->hw.conf.channel->band,
sdata->rc_rateidx_mask
- [local->hw.conf.channel->band]);
+ [local->hw.conf.channel->band],
+ chan);
skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
ssid, ssid_len,