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-rw-r--r--include/net/cfg80211.h36
-rw-r--r--include/uapi/linux/nl80211.h30
-rw-r--r--net/wireless/nl80211.c44
3 files changed, 99 insertions, 11 deletions
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index cb13789..4456491 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1620,6 +1620,17 @@ struct cfg80211_sched_scan_plan {
};
/**
+ * struct cfg80211_bss_select_adjust - BSS selection with RSSI adjustment.
+ *
+ * @band: band of BSS which should match for RSSI level adjustment.
+ * @delta: value of RSSI level adjustment.
+ */
+struct cfg80211_bss_select_adjust {
+ enum nl80211_band band;
+ s8 delta;
+};
+
+/**
* struct cfg80211_sched_scan_request - scheduled scan request description
*
* @ssids: SSIDs to scan for (passed in the probe_reqs in active scans)
@@ -1654,6 +1665,16 @@ struct cfg80211_sched_scan_plan {
* cycle. The driver may ignore this parameter and start
* immediately (or at any other time), if this feature is not
* supported.
+ * @relative_rssi_set: Indicates whether @relative_rssi is set or not.
+ * @relative_rssi: Relative RSSI threshold in dB to restrict scan result
+ * reporting in connected state to cases where a matching BSS is determined
+ * to have better or slightly worse RSSI than the current connected BSS.
+ * The relative RSSI threshold values are ignored in disconnected state.
+ * @rssi_adjust: delta dB of RSSI preference to be given to the BSSs that belong
+ * to the specified band while deciding whether a better BSS is reported
+ * using @relative_rssi. If delta is a negative number, the BSSs that
+ * belong to the specified band will be penalized by delta dB in relative
+ * comparisions.
*/
struct cfg80211_sched_scan_request {
struct cfg80211_ssid *ssids;
@@ -1673,6 +1694,10 @@ struct cfg80211_sched_scan_request {
u8 mac_addr[ETH_ALEN] __aligned(2);
u8 mac_addr_mask[ETH_ALEN] __aligned(2);
+ bool relative_rssi_set;
+ s8 relative_rssi;
+ struct cfg80211_bss_select_adjust rssi_adjust;
+
/* internal */
struct wiphy *wiphy;
struct net_device *dev;
@@ -1981,17 +2006,6 @@ struct cfg80211_ibss_params {
};
/**
- * struct cfg80211_bss_select_adjust - BSS selection with RSSI adjustment.
- *
- * @band: band of BSS which should match for RSSI level adjustment.
- * @delta: value of RSSI level adjustment.
- */
-struct cfg80211_bss_select_adjust {
- enum nl80211_band band;
- s8 delta;
-};
-
-/**
* struct cfg80211_bss_selection - connection parameters for BSS selection.
*
* @behaviour: requested BSS selection behaviour.
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 908886c..6b17feb 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -1982,6 +1982,20 @@ enum nl80211_commands {
* @NL80211_ATTR_BSSID: The BSSID of the AP. Note that %NL80211_ATTR_MAC is also
* used in various commands/events for specifying the BSSID.
*
+ * @NL80211_ATTR_SCHED_SCAN_RELATIVE_RSSI: Relative RSSI threshold by which
+ * other BSSs has to be better or slightly worse than the current
+ * connected BSS so that they get reported to user space.
+ * This will give an opportunity to userspace to consider connecting to
+ * other matching BSSs which have better or slightly worse RSSI than
+ * the current connected BSS by using an offloaded operation to avoid
+ * unnecessary wakeups.
+ *
+ * @NL80211_ATTR_SCHED_SCAN_RSSI_ADJUST: When present the RSSI level for BSSs in
+ * the specified band is to be adjusted before doing
+ * %NL80211_ATTR_SCHED_SCAN_RELATIVE_RSSI based comparision to figure out
+ * better BSSs. The attribute value is a packed structure
+ * value as specified by &struct nl80211_bss_select_rssi_adjust.
+ *
* @NUM_NL80211_ATTR: total number of nl80211_attrs available
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
@@ -2388,6 +2402,9 @@ enum nl80211_attrs {
NL80211_ATTR_BSSID,
+ NL80211_ATTR_SCHED_SCAN_RELATIVE_RSSI,
+ NL80211_ATTR_SCHED_SCAN_RSSI_ADJUST,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@@ -3080,6 +3097,13 @@ enum nl80211_reg_rule_attr {
* how this API was implemented in the past. Also, due to the same problem,
* the only way to create a matchset with only an RSSI filter (with this
* attribute) is if there's only a single matchset with the RSSI attribute.
+ * @NL80211_SCHED_SCAN_MATCH_ATTR_RELATIVE_RSSI: Flag indicating whether
+ * %NL80211_SCHED_SCAN_MATCH_ATTR_RSSI to be used as absolute RSSI or
+ * relative to current bss's RSSI.
+ * @NL80211_SCHED_SCAN_MATCH_ATTR_RSSI_ADJUST: When present the RSSI level for
+ * BSS-es in the specified band is to be adjusted before doing
+ * RSSI-based BSS selection. The attribute value is a packed structure
+ * value as specified by &struct nl80211_bss_select_rssi_adjust.
* @NL80211_SCHED_SCAN_MATCH_ATTR_MAX: highest scheduled scan filter
* attribute number currently defined
* @__NL80211_SCHED_SCAN_MATCH_ATTR_AFTER_LAST: internal use
@@ -3089,6 +3113,8 @@ enum nl80211_sched_scan_match_attr {
NL80211_SCHED_SCAN_MATCH_ATTR_SSID,
NL80211_SCHED_SCAN_MATCH_ATTR_RSSI,
+ NL80211_SCHED_SCAN_MATCH_ATTR_RELATIVE_RSSI,
+ NL80211_SCHED_SCAN_MATCH_ATTR_RSSI_ADJUST,
/* keep last */
__NL80211_SCHED_SCAN_MATCH_ATTR_AFTER_LAST,
@@ -4703,6 +4729,9 @@ enum nl80211_feature_flags {
* in @NL80211_CMD_FRAME while not associated.
* @NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED: This driver supports
* randomized TA in @NL80211_CMD_FRAME while associated.
+ * @NL80211_EXT_FEATURE_SCHED_SCAN_RELATIVE_RSSI: The driver supports sched_scan
+ * for reporting BSSs with better RSSI than the current connected BSS
+ * (%NL80211_ATTR_SCHED_SCAN_RELATIVE_RSSI).
*
* @NUM_NL80211_EXT_FEATURES: number of extended features.
* @MAX_NL80211_EXT_FEATURES: highest extended feature index.
@@ -4720,6 +4749,7 @@ enum nl80211_ext_feature_index {
NL80211_EXT_FEATURE_FILS_STA,
NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA,
NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED,
+ NL80211_EXT_FEATURE_SCHED_SCAN_RELATIVE_RSSI,
/* add new features before the definition below */
NUM_NL80211_EXT_FEATURES,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index b378d0a..71c66ff 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -405,6 +405,10 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_FILS_NONCES] = { .len = 2 * FILS_NONCE_LEN },
[NL80211_ATTR_MULTICAST_TO_UNICAST_ENABLED] = { .type = NLA_FLAG, },
[NL80211_ATTR_BSSID] = { .len = ETH_ALEN },
+ [NL80211_ATTR_SCHED_SCAN_RELATIVE_RSSI] = { .type = NLA_S8 },
+ [NL80211_ATTR_SCHED_SCAN_RSSI_ADJUST] = {
+ .len = sizeof(struct nl80211_bss_select_rssi_adjust)
+ },
};
/* policy for the key attributes */
@@ -6950,6 +6954,12 @@ nl80211_parse_sched_scan(struct wiphy *wiphy, struct wireless_dev *wdev,
if (!n_plans || n_plans > wiphy->max_sched_scan_plans)
return ERR_PTR(-EINVAL);
+ if (!wiphy_ext_feature_isset(
+ wiphy, NL80211_EXT_FEATURE_SCHED_SCAN_RELATIVE_RSSI) &&
+ (attrs[NL80211_ATTR_SCHED_SCAN_RELATIVE_RSSI] ||
+ attrs[NL80211_ATTR_SCHED_SCAN_RSSI_ADJUST]))
+ return ERR_PTR(-EINVAL);
+
request = kzalloc(sizeof(*request)
+ sizeof(*request->ssids) * n_ssids
+ sizeof(*request->match_sets) * n_match_sets
@@ -7156,6 +7166,26 @@ nl80211_parse_sched_scan(struct wiphy *wiphy, struct wireless_dev *wdev,
request->delay =
nla_get_u32(attrs[NL80211_ATTR_SCHED_SCAN_DELAY]);
+ if (attrs[NL80211_ATTR_SCHED_SCAN_RELATIVE_RSSI]) {
+ request->relative_rssi = nla_get_s8(
+ attrs[NL80211_ATTR_SCHED_SCAN_RELATIVE_RSSI]);
+ request->relative_rssi_set = true;
+ }
+
+ if (request->relative_rssi_set &&
+ attrs[NL80211_ATTR_SCHED_SCAN_RSSI_ADJUST]) {
+ struct nl80211_bss_select_rssi_adjust *rssi_adjust;
+
+ rssi_adjust = nla_data(
+ attrs[NL80211_ATTR_SCHED_SCAN_RSSI_ADJUST]);
+ request->rssi_adjust.band = rssi_adjust->band;
+ request->rssi_adjust.delta = rssi_adjust->delta;
+ if (!is_band_valid(wiphy, request->rssi_adjust.band)) {
+ err = -EINVAL;
+ goto out_free;
+ }
+ }
+
err = nl80211_parse_sched_scan_plans(wiphy, n_plans, request, attrs);
if (err)
goto out_free;
@@ -9692,6 +9722,20 @@ static int nl80211_send_wowlan_nd(struct sk_buff *msg,
if (nla_put_u32(msg, NL80211_ATTR_SCHED_SCAN_DELAY, req->delay))
return -ENOBUFS;
+ if (req->relative_rssi_set) {
+ struct nl80211_bss_select_rssi_adjust rssi_adjust;
+
+ if (nla_put_s8(msg, NL80211_ATTR_SCHED_SCAN_RELATIVE_RSSI,
+ req->relative_rssi))
+ return -ENOBUFS;
+
+ rssi_adjust.band = req->rssi_adjust.band;
+ rssi_adjust.delta = req->rssi_adjust.delta;
+ if (nla_put(msg, NL80211_ATTR_SCHED_SCAN_RSSI_ADJUST,
+ sizeof(rssi_adjust), &rssi_adjust))
+ return -ENOBUFS;
+ }
+
freqs = nla_nest_start(msg, NL80211_ATTR_SCAN_FREQUENCIES);
if (!freqs)
return -ENOBUFS;
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