Add support for virtual interface creation/deletion

Extend interface_add and interface_remove commands via an optional
argument to allow wpa_supplicant to create/delete a new virtual
interface.

Signed-off-by: Jithu Jance <jithu@broadcom.com>

wpa_supplicant/ctrl_iface.c

@@ -8521,11 +8521,14 @@ static int wpa_supplicant_global_iface_add(struct wpa_global *global,
 					   char *cmd)
 {
 	struct wpa_interface iface;
-	char *pos;
+	char *pos, *extra;
+	struct wpa_supplicant *wpa_s;
+	unsigned int create_iface = 0;
+	u8 mac_addr[ETH_ALEN];
 
 	/*
 	 * <ifname>TAB<confname>TAB<driver>TAB<ctrl_interface>TAB<driver_param>
-	 * TAB<bridge_ifname>
+	 * TAB<bridge_ifname>[TAB<create>]
 	 */
 	wpa_printf(MSG_DEBUG, "CTRL_IFACE GLOBAL INTERFACE_ADD '%s'", cmd);
 
@@ -8585,12 +8588,47 @@ static int wpa_supplicant_global_iface_add(struct wpa_global *global,
 			iface.bridge_ifname = NULL;
 		if (pos == NULL)
 			break;
+
+		extra = pos;
+		pos = os_strchr(pos, '\t');
+		if (pos)
+			*pos++ = '\0';
+		if (os_strcmp(extra, "create") == 0)
+			create_iface = 1;
+		else
+			return -1;
 	} while (0);
 
+	if (create_iface) {
+		wpa_printf(MSG_DEBUG, "CTRL_IFACE creating interface '%s'",
+			   iface.ifname);
+		if (!global->ifaces)
+			return -1;
+		if (wpa_drv_if_add(global->ifaces, WPA_IF_STATION, iface.ifname,
+				   NULL, NULL, NULL, mac_addr, NULL) < 0) {
+			wpa_printf(MSG_ERROR,
+				   "CTRL_IFACE interface creation failed");
+			return -1;
+		}
+
+		wpa_printf(MSG_DEBUG,
+			   "CTRL_IFACE interface '%s' created with MAC addr: "
+			   MACSTR, iface.ifname, MAC2STR(mac_addr));
+	}
+
 	if (wpa_supplicant_get_iface(global, iface.ifname))
-		return -1;
+		goto fail;
+
+	wpa_s = wpa_supplicant_add_iface(global, &iface, NULL);
+	if (!wpa_s)
+		goto fail;
+	wpa_s->added_vif = create_iface;
+	return 0;
 
-	return wpa_supplicant_add_iface(global, &iface, NULL) ? 0 : -1;
+fail:
+	if (create_iface)
+		wpa_drv_if_remove(global->ifaces, WPA_IF_STATION, iface.ifname);
+	return -1;
 }
 
 
@@ -8598,13 +8636,22 @@ static int wpa_supplicant_global_iface_remove(struct wpa_global *global,
 					      char *cmd)
 {
 	struct wpa_supplicant *wpa_s;
+	int ret;
+	unsigned int delete_iface;
 
 	wpa_printf(MSG_DEBUG, "CTRL_IFACE GLOBAL INTERFACE_REMOVE '%s'", cmd);
 
 	wpa_s = wpa_supplicant_get_iface(global, cmd);
 	if (wpa_s == NULL)
 		return -1;
-	return wpa_supplicant_remove_iface(global, wpa_s, 0);
+	delete_iface = wpa_s->added_vif;
+	ret = wpa_supplicant_remove_iface(global, wpa_s, 0);
+	if (!ret && delete_iface) {
+		wpa_printf(MSG_DEBUG, "CTRL_IFACE deleting the interface '%s'",
+			   cmd);
+		ret = wpa_drv_if_remove(global->ifaces, WPA_IF_STATION, cmd);
+	}
+	return ret;
 }
 
 

wpa_supplicant/wpa_cli.c

@@ -1711,20 +1711,20 @@ static int wpa_cli_cmd_interface_add(struct wpa_ctrl *ctrl, int argc,
 		printf("Invalid INTERFACE_ADD command: needs at least one "
 		       "argument (interface name)\n"
 		       "All arguments: ifname confname driver ctrl_interface "
-		       "driver_param bridge_name\n");
+		       "driver_param bridge_name [create]\n");
 		return -1;
 	}
 
 	/*
 	 * INTERFACE_ADD <ifname>TAB<confname>TAB<driver>TAB<ctrl_interface>TAB
-	 * <driver_param>TAB<bridge_name>
+	 * <driver_param>TAB<bridge_name>[TAB<create>]
 	 */
 	res = os_snprintf(cmd, sizeof(cmd),
-			  "INTERFACE_ADD %s\t%s\t%s\t%s\t%s\t%s",
+			  "INTERFACE_ADD %s\t%s\t%s\t%s\t%s\t%s\t%s",
 			  argv[0],
 			  argc > 1 ? argv[1] : "", argc > 2 ? argv[2] : "",
 			  argc > 3 ? argv[3] : "", argc > 4 ? argv[4] : "",
-			  argc > 5 ? argv[5] : "");
+			  argc > 5 ? argv[5] : "", argc > 6 ? argv[6] : "");
 	if (os_snprintf_error(sizeof(cmd), res))
 		return -1;
 	cmd[sizeof(cmd) - 1] = '\0';

wpa_supplicant/wpa_supplicant_i.h

@@ -648,6 +648,7 @@ struct wpa_supplicant {
 	unsigned int eap_expected_failure:1;
 	unsigned int reattach:1; /* reassociation to the same BSS requested */
 	unsigned int mac_addr_changed:1;
+	unsigned int added_vif:1;
 
 	struct os_reltime last_mac_addr_change;
 	int last_mac_addr_style;