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[PATCH] brcmfmac: support AP isolation to restrict reachability between stations

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From: Wright Feng <wright.feng@xxxxxxxxxxx>

hostapd & wpa_supplicant userspace daemons exposes an AP mode specific
config file parameter "ap_isolate" to the user, which is used to control
low-level bridging of frames between the stations associated in the BSS.

In driver, handle this user setting in the newly defined cfg80211_ops
function brcmf_cfg80211_change_bss() by enabling "ap_isolate" IOVAR in
the firmware.

In AP mode, the "ap_isolate" value from the cfg80211 layer represents,
 0 = allow low-level bridging of frames between associated stations
 1 = restrict low-level bridging of frames to isolate associated stations
-1 = do not change existing setting

Signed-off-by: Wright Feng <wright.feng@xxxxxxxxxxx>
Signed-off-by: Chi-hsien Lin <chi-hsien.lin@xxxxxxxxxxx>
Signed-off-by: Gokul Sivakumar <gokulkumar.sivakumar@xxxxxxxxxxxx>
---
 .../broadcom/brcm80211/brcmfmac/cfg80211.c    | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 4b70845e1a26..bd72d8df2a22 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -5931,6 +5931,26 @@ static int brcmf_cfg80211_del_pmk(struct wiphy *wiphy, struct net_device *dev,
 	return brcmf_set_pmk(ifp, NULL, 0);
 }
 
+static int brcmf_cfg80211_change_bss(struct wiphy *wiphy, struct net_device *dev,
+				     struct bss_parameters *params)
+{
+	struct brcmf_if *ifp = netdev_priv(dev);
+	int ret = 0;
+
+	/* In AP mode, the "ap_isolate" value represents
+	 *  0 = allow low-level bridging of frames between associated stations
+	 *  1 = restrict low-level bridging of frames to isolate associated stations
+	 * -1 = do not change existing setting
+	 */
+	if (params->ap_isolate >= 0) {
+		ret = brcmf_fil_iovar_int_set(ifp, "ap_isolate", params->ap_isolate);
+		if (ret < 0)
+			brcmf_err("ap_isolate iovar failed: ret=%d\n", ret);
+	}
+
+	return ret;
+}
+
 static struct cfg80211_ops brcmf_cfg80211_ops = {
 	.add_virtual_intf = brcmf_cfg80211_add_iface,
 	.del_virtual_intf = brcmf_cfg80211_del_iface,
@@ -5978,6 +5998,7 @@ static struct cfg80211_ops brcmf_cfg80211_ops = {
 	.update_connect_params = brcmf_cfg80211_update_conn_params,
 	.set_pmk = brcmf_cfg80211_set_pmk,
 	.del_pmk = brcmf_cfg80211_del_pmk,
+	.change_bss = brcmf_cfg80211_change_bss,
 };
 
 struct cfg80211_ops *brcmf_cfg80211_get_ops(struct brcmf_mp_device *settings)
-- 
2.47.0





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