IW_SCAN_CAPA_ESSID vs hidden ESSID

[Ben Hutchings <ben@decadent.org.uk>]

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Since upgrading from Linux 2.6.24 to .25, I have found that
NetworkManager cannot associate my Intel wireless card, handled by the
ipw2200 driver, with my AP, which has a hidden SSID.

NetworkManager thinks that wpa_supplicant should be able to scan for
specific hidden SSIDs if the underlying driver advertises
IW_SCAN_CAPA_ESSID, which ipw2200 does since 2.6.25:

	/* Use "AP_SCAN 2" if:
	 * - The wireless network is non-broadcast and the driver doesn't support
	 *     scanning specific SSIDs
	 * - The wireless network is Ad-Hoc
	 * - The wireless driver does not support WPA (stupid drivers...)
	 */
	is_adhoc = (nm_ap_get_mode(ap) == IW_MODE_ADHOC);
	if (is_adhoc || !supports_wpa)
		ap_scan = "AP_SCAN 2";
	else if (!nm_ap_get_broadcast (ap))
		ap_scan = self->priv->has_scan_capa_ssid ? "AP_SCAN 1" : "AP_SCAN 2";

However, this doesn't work because the scan results just have an empty
string or "<hidden>" (not consistently, which is weird).

So one of these components is doing the wrong thing.  Is it that:

1. ipw2200 or ieee80211 should copy the selected ESSID into scan results
2. wpa_supplicant should not check the ESSID of scan results if it has
already selected an ESSId
3. NetworkManager should not expect IW_SCAN_CAPA_ESSID to mean that this
will work

?

Ben.

-- 
Ben Hutchings
We get into the habit of living before acquiring the habit of thinking.
                                                              - Albert Camus

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