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Verify that the selected BSS has a better signal level before roaming

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This prevents situations like the following where we roam to a
lesser quality BSS just because the signal level delta is over our
threshold.

wlan0: Considering within-ESS reassociation
wlan0: Current BSS: 00:24:6c:74:0a:40 level=-51
wlan0: Selected BSS: 00:24:6c:74:0a:e0 level=-64
wlan0: Request association: reassociate: 0  selected: 00:24:6c:74:0a:e0
    bssid: 00:24:6c:74:0a:40  pending: 00:00:00:00:00:00  wpa_state: COMPLETED

Signed-hostap: Robert Shade <robert.shade@gmail.com>
This commit is contained in:
Robert Shade 2012-11-24 17:17:50 +02:00 committed by Jouni Malinen
parent fb660a9431
commit bff954e9a2
1 changed files with 6 additions and 0 deletions
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6
wpa_supplicant/events.c
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@ -1025,6 +1025,12 @@ static int wpa_supplicant_need_to_roam(struct wpa_supplicant *wpa_s,
return 1;
}
if (current_bss->level < 0 && current_bss->level > selected->level) {
wpa_dbg(wpa_s, MSG_DEBUG, "Skip roam - Current BSS has better "
"signal level");
return 0;
}
min_diff = 2;
if (current_bss->level < 0) {
if (current_bss->level < -85)