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nl80211/cfg80211: Specify band specific min RSSI thresholds with sched scan

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This commit adds the support to specify the RSSI thresholds per
band for each match set. This enhances the current behavior which
specifies a single rssi_threshold across all the bands by
introducing the rssi_threshold_per_band. These per band rssi
thresholds are referred through NL80211_BAND_* (enum nl80211_band)
variables  as attribute types. Such attributes/values per each
band are nested through NL80211_ATTR_SCHED_SCAN_MIN_RSSI.
These band specific rssi thresholds shall take precedence over
the current rssi_thold per match set.
Drivers indicate this support through
%NL80211_EXT_FEATURE_SCHED_SCAN_BAND_SPECIFIC_RSSI_THOLD.
These per band rssi attributes/values does not specify
"default RSSI filter" as done by
NL80211_SCHED_SCAN_MATCH_ATTR_RSSI to stay backward compatible.
That said, these per band rssi values have to be specified for
the corresponding matchset.

Signed-off-by: vamsi krishna <vamsin@codeaurora.org>
Signed-off-by: Srinivas Dasari <dasaris@codeaurora.org>
[rebase on refactoring, add policy]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
vamsi krishna 2019-02-01 18:34:51 +05:30 committed by Johannes Berg
parent d39f3b4f33
commit 1e1b11b6a1
3 changed files with 74 additions and 0 deletions
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8
include/net/cfg80211.h
View File

@ -1832,11 +1832,19 @@ static inline void get_random_mask_addr(u8 *buf, const u8 *addr, const u8 *mask)
* @bssid: BSSID to be matched; may be all-zero BSSID in case of SSID match
* or no match (RSSI only)
* @rssi_thold: don't report scan results below this threshold (in s32 dBm)
* @per_band_rssi_thold: Minimum rssi threshold for each band to be applied
* for filtering out scan results received. Drivers advertize this support
* of band specific rssi based filtering through the feature capability
* %NL80211_EXT_FEATURE_SCHED_SCAN_BAND_SPECIFIC_RSSI_THOLD. These band
* specific rssi thresholds take precedence over rssi_thold, if specified.
* If not specified for any band, it will be assigned with rssi_thold of
* corresponding matchset.
*/
struct cfg80211_match_set {
struct cfg80211_ssid ssid;
u8 bssid[ETH_ALEN];
s32 rssi_thold;
s32 per_band_rssi_thold[NUM_NL80211_BANDS];
};
/**

13
include/uapi/linux/nl80211.h
View File

@ -3638,6 +3638,14 @@ enum nl80211_reg_rule_attr {
* value as specified by &struct nl80211_bss_select_rssi_adjust.
* @NL80211_SCHED_SCAN_MATCH_ATTR_BSSID: BSSID to be used for matching
* (this cannot be used together with SSID).
* @NL80211_SCHED_SCAN_MATCH_PER_BAND_RSSI: Nested attribute that carries the
* band specific minimum rssi thresholds for the bands defined in
* enum nl80211_band. The minimum rssi threshold value(s32) specific to a
* band shall be encapsulated in attribute with type value equals to one
* of the NL80211_BAND_* defined in enum nl80211_band. For example, the
* minimum rssi threshold value for 2.4GHZ band shall be encapsulated
* within an attribute of type NL80211_BAND_2GHZ. And one or more of such
* attributes will be nested within this attribute.
* @NL80211_SCHED_SCAN_MATCH_ATTR_MAX: highest scheduled scan filter
* attribute number currently defined
* @__NL80211_SCHED_SCAN_MATCH_ATTR_AFTER_LAST: internal use
@ -3650,6 +3658,7 @@ enum nl80211_sched_scan_match_attr {
NL80211_SCHED_SCAN_MATCH_ATTR_RELATIVE_RSSI,
NL80211_SCHED_SCAN_MATCH_ATTR_RSSI_ADJUST,
NL80211_SCHED_SCAN_MATCH_ATTR_BSSID,
NL80211_SCHED_SCAN_MATCH_PER_BAND_RSSI,
/* keep last */
__NL80211_SCHED_SCAN_MATCH_ATTR_AFTER_LAST,
@ -5343,6 +5352,9 @@ enum nl80211_feature_flags {
* @NL80211_EXT_FEATURE_AP_PMKSA_CACHING: Driver/device supports PMKSA caching
* (set/del PMKSA operations) in AP mode.
*
* @NL80211_EXT_FEATURE_SCHED_SCAN_BAND_SPECIFIC_RSSI_THOLD: Driver supports
* filtering of sched scan results using band specific RSSI thresholds.
*
* @NUM_NL80211_EXT_FEATURES: number of extended features.
* @MAX_NL80211_EXT_FEATURES: highest extended feature index.
*/
@ -5384,6 +5396,7 @@ enum nl80211_ext_feature_index {
NL80211_EXT_FEATURE_ENABLE_FTM_RESPONDER,
NL80211_EXT_FEATURE_AIRTIME_FAIRNESS,
NL80211_EXT_FEATURE_AP_PMKSA_CACHING,
NL80211_EXT_FEATURE_SCHED_SCAN_BAND_SPECIFIC_RSSI_THOLD,
/* add new features before the definition below */
NUM_NL80211_EXT_FEATURES,

53
net/wireless/nl80211.c
View File

@ -617,12 +617,21 @@ nl80211_rekey_policy[NUM_NL80211_REKEY_DATA] = {
[NL80211_REKEY_DATA_REPLAY_CTR] = { .len = NL80211_REPLAY_CTR_LEN },
};
static const struct nla_policy
nl80211_match_band_rssi_policy[NUM_NL80211_BANDS] = {
[NL80211_BAND_2GHZ] = { .type = NLA_S32 },
[NL80211_BAND_5GHZ] = { .type = NLA_S32 },
[NL80211_BAND_60GHZ] = { .type = NLA_S32 },
};
static const struct nla_policy
nl80211_match_policy[NL80211_SCHED_SCAN_MATCH_ATTR_MAX + 1] = {
[NL80211_SCHED_SCAN_MATCH_ATTR_SSID] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_SSID_LEN },
[NL80211_SCHED_SCAN_MATCH_ATTR_BSSID] = { .len = ETH_ALEN },
[NL80211_SCHED_SCAN_MATCH_ATTR_RSSI] = { .type = NLA_U32 },
[NL80211_SCHED_SCAN_MATCH_PER_BAND_RSSI] =
NLA_POLICY_NESTED(nl80211_match_band_rssi_policy),
};
static const struct nla_policy
@ -7537,6 +7546,41 @@ nl80211_parse_sched_scan_plans(struct wiphy *wiphy, int n_plans,
return 0;
}
static int
nl80211_parse_sched_scan_per_band_rssi(struct wiphy *wiphy,
struct cfg80211_match_set *match_sets,
struct nlattr *tb_band_rssi,
s32 rssi_thold)
{
struct nlattr *attr;
int i, tmp, ret = 0;
if (!wiphy_ext_feature_isset(wiphy,
NL80211_EXT_FEATURE_SCHED_SCAN_BAND_SPECIFIC_RSSI_THOLD)) {
if (tb_band_rssi)
ret = -EOPNOTSUPP;
else
for (i = 0; i < NUM_NL80211_BANDS; i++)
match_sets->per_band_rssi_thold[i] =
NL80211_SCAN_RSSI_THOLD_OFF;
return ret;
}
for (i = 0; i < NUM_NL80211_BANDS; i++)
match_sets->per_band_rssi_thold[i] = rssi_thold;
nla_for_each_nested(attr, tb_band_rssi, tmp) {
enum nl80211_band band = nla_type(attr);
if (band < 0 || band >= NUM_NL80211_BANDS)
return -EINVAL;
match_sets->per_band_rssi_thold[band] = nla_get_s32(attr);
}
return 0;
}
static struct cfg80211_sched_scan_request *
nl80211_parse_sched_scan(struct wiphy *wiphy, struct wireless_dev *wdev,
struct nlattr **attrs, int max_match_sets)
@ -7816,6 +7860,15 @@ nl80211_parse_sched_scan(struct wiphy *wiphy, struct wireless_dev *wdev,
if (rssi)
request->match_sets[i].rssi_thold =
nla_get_s32(rssi);
/* Parse per band RSSI attribute */
err = nl80211_parse_sched_scan_per_band_rssi(wiphy,
&request->match_sets[i],
tb[NL80211_SCHED_SCAN_MATCH_PER_BAND_RSSI],
request->match_sets[i].rssi_thold);
if (err)
goto out_free;
i++;
}