openwrt/package/network/services/hostapd/patches/740-snoop_iface.patch

--- a/src/ap/ap_config.h
+++ b/src/ap/ap_config.h
@@ -284,6 +284,7 @@ struct hostapd_bss_config {
 	char iface[IFNAMSIZ + 1];
 	char bridge[IFNAMSIZ + 1];
 	char ft_iface[IFNAMSIZ + 1];
+	char snoop_iface[IFNAMSIZ + 1];
 	char vlan_bridge[IFNAMSIZ + 1];
 	char wds_bridge[IFNAMSIZ + 1];
 
--- a/src/ap/x_snoop.c
+++ b/src/ap/x_snoop.c
@@ -33,14 +33,16 @@ int x_snoop_init(struct hostapd_data *ha
 
 	hapd->x_snoop_initialized = true;
 
-	if (hostapd_drv_br_port_set_attr(hapd, DRV_BR_PORT_ATTR_HAIRPIN_MODE,
+	if (!conf->snoop_iface[0] &&
+	    hostapd_drv_br_port_set_attr(hapd, DRV_BR_PORT_ATTR_HAIRPIN_MODE,
 					 1)) {
 		wpa_printf(MSG_DEBUG,
 			   "x_snoop: Failed to enable hairpin_mode on the bridge port");
 		return -1;
 	}
 
-	if (hostapd_drv_br_port_set_attr(hapd, DRV_BR_PORT_ATTR_PROXYARP, 1)) {
+	if (!conf->snoop_iface[0] &&
+	    hostapd_drv_br_port_set_attr(hapd, DRV_BR_PORT_ATTR_PROXYARP, 1)) {
 		wpa_printf(MSG_DEBUG,
 			   "x_snoop: Failed to enable proxyarp on the bridge port");
 		return -1;
@@ -54,7 +56,8 @@ int x_snoop_init(struct hostapd_data *ha
 	}
 
 #ifdef CONFIG_IPV6
-	if (hostapd_drv_br_set_net_param(hapd, DRV_BR_MULTICAST_SNOOPING, 1)) {
+	if (!conf->snoop_iface[0] &&
+	    hostapd_drv_br_set_net_param(hapd, DRV_BR_MULTICAST_SNOOPING, 1)) {
 		wpa_printf(MSG_DEBUG,
 			   "x_snoop: Failed to enable multicast snooping on the bridge");
 		return -1;
@@ -73,8 +76,12 @@ x_snoop_get_l2_packet(struct hostapd_dat
 {
 	struct hostapd_bss_config *conf = hapd->conf;
 	struct l2_packet_data *l2;
+	const char *ifname = conf->bridge;
 
-	l2 = l2_packet_init(conf->bridge, NULL, ETH_P_ALL, handler, hapd, 1);
+	if (conf->snoop_iface[0])
+		ifname = conf->snoop_iface;
+
+	l2 = l2_packet_init(ifname, NULL, ETH_P_ALL, handler, hapd, 1);
 	if (l2 == NULL) {
 		wpa_printf(MSG_DEBUG,
 			   "x_snoop: Failed to initialize L2 packet processing %s",
--- a/hostapd/config_file.c
+++ b/hostapd/config_file.c
@@ -2318,6 +2318,8 @@ static int hostapd_config_fill(struct ho
 		os_strlcpy(bss->bridge, pos, sizeof(bss->bridge));
 		if (!bss->wds_bridge[0])
 			os_strlcpy(bss->wds_bridge, pos, sizeof(bss->wds_bridge));
+	} else if (os_strcmp(buf, "snoop_iface") == 0) {
+		os_strlcpy(bss->snoop_iface, pos, sizeof(bss->snoop_iface));
 	} else if (os_strcmp(buf, "vlan_bridge") == 0) {
 		os_strlcpy(bss->vlan_bridge, pos, sizeof(bss->vlan_bridge));
 	} else if (os_strcmp(buf, "wds_bridge") == 0) {