This patch adds a new wext event that notifies the user space about a low
signal quality. The currently used indicator is as follows: If three
successive beacons are received with a signal quality lower then 40%
user space gets informed.
Any ideas about which indicators should be used? Comments?
Signed-off-by: Helmut Schaa <hschaa@xxxxxxx>
---
diff --git a/include/linux/wireless.h b/include/linux/wireless.h
index d7958f9..6229aa2 100644
--- a/include/linux/wireless.h
+++ b/include/linux/wireless.h
@@ -294,6 +294,7 @@
#define SIOCSIWPOWER 0x8B2C /* set Power Management settings */
#define SIOCGIWPOWER 0x8B2D /* get Power Management settings */
+
/* WPA : Generic IEEE 802.11 informatiom element (e.g., for WPA/RSN/WMM).
* This ioctl uses struct iw_point and data buffer that includes IE id and len
* fields. More than one IE may be included in the request. Setting the generic
@@ -389,6 +390,8 @@
* pre-authentication
* (struct iw_pmkid_cand) */
+#define IWEVROAM 0x8C0A /* roaming threshold exceeded */
+
#define IWEVFIRST 0x8C00
#define IW_EVENT_IDX(cmd) ((cmd) - IWEVFIRST)
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 3912fba..c05f70c 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -351,6 +351,7 @@ struct ieee80211_if_sta {
u32 supp_rates_bits[IEEE80211_NUM_BANDS];
int wmm_last_param_set;
+ unsigned int roam_threshold_count;
};
struct ieee80211_if_mesh {
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 2e55208..e67fe56 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -45,6 +45,7 @@
#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
+#define IEEE80211_ROAMING_QUALITY_THRESHOLD 40
/* utils */
static int ecw2cw(int ecw)
@@ -1659,6 +1660,27 @@ static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
}
}
+static void ieee80211_rx_check_threshold(struct ieee80211_sub_if_data *sdata,
+ int freq)
+{
+ union iwreq_data wrqu;
+ struct ieee80211_bss *bss;
+ struct ieee80211_if_sta *ifsta = &sdata->u.sta;
+ bss = ieee80211_rx_bss_get(sdata->local, ifsta->bssid, freq,
+ ifsta->ssid, ifsta->ssid_len);
+
+ if (bss->qual < IEEE80211_ROAMING_QUALITY_THRESHOLD) {
+ if (++(ifsta->roam_threshold_count) > 3) {
+ printk(KERN_DEBUG "%s roaming theshold exceeded\n",
+ sdata->dev->name);
+ memset(&wrqu, 0, sizeof(wrqu));
+ wireless_send_event(sdata->dev, IWEVROAM, &wrqu, NULL);
+ }
+ } else
+ ifsta->roam_threshold_count = 0;
+
+ ieee80211_rx_bss_put(sdata->local, bss);
+}
static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt,
@@ -1711,6 +1733,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
&bss_info);
}
+ ieee80211_rx_check_threshold(sdata, rx_status->freq);
ieee80211_bss_info_change_notify(sdata, changed);
}
diff --git a/net/wireless/wext.c b/net/wireless/wext.c
index d98ffb7..c2feebb 100644
--- a/net/wireless/wext.c
+++ b/net/wireless/wext.c
@@ -387,6 +387,9 @@ static const struct iw_ioctl_description standard_event[] = {
.token_size = 1,
.max_tokens = sizeof(struct iw_pmkid_cand),
},
+ [IWEVROAM - IWEVFIRST] = {
+ .header_type = IW_HEADER_TYPE_ADDR,
+ },
};
static const unsigned standard_event_num = ARRAY_SIZE(standard_event);
--
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