Hi Arend, I'm replying to this since I've been "somewhat" involved in the implementation. ;) I think it will make more sense if you check the nl80211 doc: ---8<---- * @NL80211_ATTR_SCHED_SCAN_MATCH: Nested attribute with one or more * sets of attributes to match during scheduled scans. Only BSSs * that match any of the sets will be reported. These are * pass-thru filter rules. * For a match to succeed, the BSS must match all attributes of a * set. Since not every hardware supports matching all types of * attributes, there is no guarantee that the reported BSSs are * fully complying with the match sets and userspace needs to be * able to ignore them by itself. * Thus, the implementation is somewhat hardware-dependent, but * this is only an optimization and the userspace application * needs to handle all the non-filtered results anyway. * If the match attributes don't make sense when combined with * the values passed in @NL80211_ATTR_SCAN_SSIDS (eg. if an SSID * is included in the probe request, but the match attributes * will never let it go through), -EINVAL may be returned. * If ommited, no filtering is done. ---8<---- Especially the second paragraph. This means that for the SSIDs, a broadcast SSID means that everything goes through, there is no filtering of SSIDs. You can use that for RSSI-only matches with a single RSSI match attribute (so you don't need to specify an RSSI attribute for every SSID you need to match). This is a bit unclear, but it's due to some confusion that was introduced when the RSSI match attribute was added. -- Luca. On Wed, 2014-05-07 at 13:57 +0200, Arend van Spriel wrote: > Hi Johannes, > > I received a couple of reports from people who got problem with brcmfmac > when a scheduled scan is requested, without any ssid specified. > Currently, brcmfmac basically rejects the request. So what are valid > usage scenarios for scheduled scans with respect to the n_ssid, > n_channels, and n_matchsets. In the kernel doc below it says a > zero-length ssid means 'no match'. I suppose it means any ssid which > signal is above RRSI threshold will match. > > Regards, > Arend > ---8<---------------------------------------------------------- > /** > * struct cfg80211_match_set - sets of attributes to match > * > * @ssid: SSID to be matched; may be zero-length for no match (RSSI only) > * @rssi_thold: don't report scan results below this threshold (in s32 dBm) > */ > _______________________________________________ > HostAP mailing list > HostAP@xxxxxxxxxxxxxxx > http://lists.shmoo.com/mailman/listinfo/hostap -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
