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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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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++;
}