>Number: 170631
>Category: bin
>Synopsis: [PATCH] Add roaming support to wpa_supplicant
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Aug 14 11:00:21 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: Daan Vreeken
>Release: FreeBSD 10.0-CURRENT amd64
>Organization:
Vitsch Electronics - http://VitschVPN.nl/
>Environment:
System:
FreeBSD Devel13.Vitsch.LAN 10.0-CURRENT FreeBSD 10.0-CURRENT #0: Sat Jan 28
21:31:14 CET 2012 root@Compile2:/usr/src/sys/amd64/compile/Multimedia amd64
>Description:
The wpa_supplicant application has the ability to do roaming based on the
received signal strength indication (RSSI), but currently this is broken in
FreeBSD.
At this moment wpa_supplicant will always report a level of 0dBm for all
detected wireless networks.
>How-To-Repeat:
Run wpa_supplicant with the '-d' option set and with a configuration file
that allows it to connect to at least two Access Points that are in the
vicinity of the receiver.
Note that wpa_supplicant will always report a level of '0' for all networks.
>Fix:
The wpa_supplicant's FreeBSD driver interface only sets 'result->qual' and
'result->noise', but not 'result->level' in wpa_driver_bsd_add_scan_entry(),
while the latter is used when sorting AP's based on their signal strength.
The attached patch fixes this by calculating 'result->level' according to
it's definition in net80211/ieee80211_node.h .
The patch also fixes a spelling error in ieee80211_var.h .
If the patch somehow gets mangled in the email, it can also be downloaded
from:
http://www.Vitsch.nl/pub_diffs/
After applying the patch, wpa_supplicant will now successfully attempt to
roam when background scanning is enabled and there is an AP with a higher
signal strength.
Sponsored by: Vitsch Electronics
--- patch_wpa_supplicant_rssi_fix_2012_08_14.diff begins here ---
Index: usr.sbin/wpa/wpa_supplicant/driver_freebsd.c
===================================================================
--- usr.sbin/wpa/wpa_supplicant/driver_freebsd.c (revision 238968)
+++ usr.sbin/wpa/wpa_supplicant/driver_freebsd.c (working copy)
@@ -693,6 +693,11 @@
result->caps = sr->isr_capinfo;
result->qual = sr->isr_rssi;
result->noise = sr->isr_noise;
+ /*
+ * the rssi value reported by the kernel is in 0.5dB steps relative to
+ * the reported noise floor. see ieee80211_node.h for details.
+ */
+ result->level = sr->isr_rssi / 2 + sr->isr_noise;
pos = (u8 *)(result + 1);
Index: sys/net80211/ieee80211_var.h
===================================================================
--- sys/net80211/ieee80211_var.h (revision 238968)
+++ sys/net80211/ieee80211_var.h (working copy)
@@ -55,7 +55,7 @@
#include <net80211/ieee80211_radiotap.h>
#include <net80211/ieee80211_scan.h>
-#define IEEE80211_TXPOWER_MAX 100 /* .5 dbM (XXX units?) */
+#define IEEE80211_TXPOWER_MAX 100 /* .5 dBm (XXX units?) */
#define IEEE80211_TXPOWER_MIN 0 /* kill radio */
#define IEEE80211_DTIM_DEFAULT 1 /* default DTIM period */
--- patch_wpa_supplicant_rssi_fix_2012_08_14.diff ends here ---
>Release-Note:
>Audit-Trail:
>Unformatted:
_______________________________________________
freebsd-bugs@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-bugs
To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
