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nl80211/cfg80211: add match filtering for sched_scan

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Introduce filtering for scheduled scans to reduce the number of
unnecessary results (which cause useless wake-ups).

Add a new nested attribute where sets of parameters to be matched can
be passed when starting a scheduled scan.  Only scan results that
match any of the sets will be returned.

At this point, the set consists of a single parameter, an SSID.  This
can be easily extended in the future to support more complex matches.

Signed-off-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luciano Coelho
2011-08-31 16:01:48 +03:00
committed by John W. Linville
parent cedb5412ba
commit a1f1c21c18
3 changed files with 121 additions and 1 deletions
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20
include/net/cfg80211.h
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@@ -875,6 +875,15 @@ struct cfg80211_scan_request {
struct ieee80211_channel *channels[0];
};
/**
* struct cfg80211_match_set - sets of attributes to match
*
* @ssid: SSID to be matched
*/
struct cfg80211_match_set {
struct cfg80211_ssid ssid;
};
/**
* struct cfg80211_sched_scan_request - scheduled scan request description
*
@@ -884,6 +893,11 @@ struct cfg80211_scan_request {
* @interval: interval between each scheduled scan cycle
* @ie: optional information element(s) to add into Probe Request or %NULL
* @ie_len: length of ie in octets
* @match_sets: sets of parameters to be matched for a scan result
* entry to be considered valid and to be passed to the host
* (others are filtered out).
* If ommited, all results are passed.
* @n_match_sets: number of match sets
* @wiphy: the wiphy this was for
* @dev: the interface
* @channels: channels to scan
@@ -895,6 +909,8 @@ struct cfg80211_sched_scan_request {
u32 interval;
const u8 *ie;
size_t ie_len;
struct cfg80211_match_set *match_sets;
int n_match_sets;
/* internal */
struct wiphy *wiphy;
@@ -1814,6 +1830,9 @@ struct wiphy_wowlan_support {
* any given scan
* @max_sched_scan_ssids: maximum number of SSIDs the device can scan
* for in any given scheduled scan
* @max_match_sets: maximum number of match sets the device can handle
* when performing a scheduled scan, 0 if filtering is not
* supported.
* @max_scan_ie_len: maximum length of user-controlled IEs device can
* add to probe request frames transmitted during a scan, must not
* include fixed IEs like supported rates
@@ -1871,6 +1890,7 @@ struct wiphy {
int bss_priv_size;
u8 max_scan_ssids;
u8 max_sched_scan_ssids;
u8 max_match_sets;
u16 max_scan_ie_len;
u16 max_sched_scan_ie_len;