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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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43
include/linux/nl80211.h
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@@ -769,6 +769,8 @@ enum nl80211_commands {
* that can be added to a scan request
* @NL80211_ATTR_MAX_SCHED_SCAN_IE_LEN: maximum length of information
* elements that can be added to a scheduled scan request
* @NL80211_ATTR_MAX_MATCH_SETS: maximum number of sets that can be
* used with @NL80211_ATTR_SCHED_SCAN_MATCH, a wiphy attribute.
*
* @NL80211_ATTR_SCAN_FREQUENCIES: nested attribute with frequencies (in MHz)
* @NL80211_ATTR_SCAN_SSIDS: nested attribute with SSIDs, leave out for passive
@@ -1011,6 +1013,24 @@ enum nl80211_commands {
* @NL80211_ATTR_SCHED_SCAN_INTERVAL: Interval between scheduled scan
* cycles, in msecs.
* @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.
*
* @NL80211_ATTR_INTERFACE_COMBINATIONS: Nested attribute listing the supported
* interface combinations. In each nested item, it contains attributes
@@ -1265,6 +1285,9 @@ enum nl80211_attrs {
NL80211_ATTR_ROAM_SUPPORT,
NL80211_ATTR_SCHED_SCAN_MATCH,
NL80211_ATTR_MAX_MATCH_SETS,
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@@ -1723,6 +1746,26 @@ enum nl80211_reg_rule_attr {
NL80211_REG_RULE_ATTR_MAX = __NL80211_REG_RULE_ATTR_AFTER_LAST - 1
};
/**
* enum nl80211_sched_scan_match_attr - scheduled scan match attributes
* @__NL80211_SCHED_SCAN_MATCH_ATTR_INVALID: attribute number 0 is reserved
* @NL80211_SCHED_SCAN_MATCH_ATTR_SSID: SSID to be used for matching,
* only report BSS with matching SSID.
* @NL80211_SCHED_SCAN_MATCH_ATTR_MAX: highest scheduled scan filter
* attribute number currently defined
* @__NL80211_SCHED_SCAN_MATCH_ATTR_AFTER_LAST: internal use
*/
enum nl80211_sched_scan_match_attr {
__NL80211_SCHED_SCAN_MATCH_ATTR_INVALID,
NL80211_ATTR_SCHED_SCAN_MATCH_SSID,
/* keep last */
__NL80211_SCHED_SCAN_MATCH_ATTR_AFTER_LAST,
NL80211_SCHED_SCAN_MATCH_ATTR_MAX =
__NL80211_SCHED_SCAN_MATCH_ATTR_AFTER_LAST - 1
};
/**
* enum nl80211_reg_rule_flags - regulatory rule flags
*