From 6094417533d97662f693d134ab04595a292de30c Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Thu, 5 Jul 2012 14:18:04 +0200
Subject: [PATCH] fix ifname for alias+vlan chains

---
 device.c |  9 ++++++++-
 device.h |  4 ++++
 ubus.c   |  3 ++-
 vlan.c   | 12 +++++++++++-
 4 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/device.c b/device.c
index 017fe03..cc41b20 100644
--- a/device.c
+++ b/device.c
@@ -163,6 +163,7 @@ alias_device_create(const char *name, struct blob_attr *attr)
 	alias = calloc(1, sizeof(*alias) + strlen(name) + 1);
 	strcpy(alias->name, name);
 	alias->dev.set_state = alias_device_set_state;
+	alias->dev.hidden = true;
 	device_init_virtual(&alias->dev, &alias_device_type, NULL);
 	alias->avl.key = alias->name;
 	avl_insert(&aliases, &alias->avl);
@@ -269,13 +270,19 @@ alias_notify_device(const char *name, struct device *dev)
 			device_remove_user(&alias->dep);
 			strcpy(alias->dev.ifname, dev->ifname);
 			device_add_user(&alias->dep, dev);
+			alias->dev.hidden = false;
+			device_broadcast_event(&alias->dev, DEV_EVENT_UPDATE_IFNAME);
 		}
 	}
 
 	device_set_present(&alias->dev, !!dev);
 
-	if (!dev && alias->dep.dev && !alias->dep.dev->active)
+	if (!dev && alias->dep.dev && !alias->dep.dev->active) {
 		device_remove_user(&alias->dep);
+		alias->dev.hidden = true;
+		alias->dev.ifname[0] = 0;
+		device_broadcast_event(&alias->dev, DEV_EVENT_UPDATE_IFNAME);
+	}
 
 	device_unlock();
 }
diff --git a/device.h b/device.h
index 3f8dc37..108d383 100644
--- a/device.h
+++ b/device.h
@@ -66,6 +66,8 @@ enum device_event {
 	DEV_EVENT_ADD,
 	DEV_EVENT_REMOVE,
 
+	DEV_EVENT_UPDATE_IFNAME,
+
 	DEV_EVENT_SETUP,
 	DEV_EVENT_TEARDOWN,
 	DEV_EVENT_UP,
@@ -113,9 +115,11 @@ struct device {
 	bool sys_present;
 	bool present;
 	int active;
+
 	bool external;
 	bool disabled;
 	bool deferred;
+	bool hidden;
 
 	bool current_config;
 	bool default_config;
diff --git a/ubus.c b/ubus.c
index 2f0019c..ee4b031 100644
--- a/ubus.c
+++ b/ubus.c
@@ -496,7 +496,8 @@ netifd_handle_status(struct ubus_context *ctx, struct ubus_object *obj,
 		blobmsg_add_string(&b, "proto", iface->proto_handler->name);
 
 	dev = iface->main_dev.dev;
-	if (dev && !(iface->proto_handler->flags & PROTO_FLAG_NODEV))
+	if (dev && !dev->hidden &&
+	    !(iface->proto_handler->flags & PROTO_FLAG_NODEV))
 		blobmsg_add_string(&b, "device", dev->ifname);
 
 	if (iface->state == IFS_UP) {
diff --git a/vlan.c b/vlan.c
index d1fb70b..ee0652f 100644
--- a/vlan.c
+++ b/vlan.c
@@ -61,6 +61,12 @@ static int vlan_set_device_state(struct device *dev, bool up)
 	return ret;
 }
 
+static void vlan_dev_set_name(struct vlan_device *vldev, struct device *dev)
+{
+	vldev->dev.hidden = dev->hidden;
+	snprintf(vldev->dev.ifname, IFNAMSIZ, "%s.%d", dev->ifname, vldev->id);
+}
+
 static void vlan_dev_cb(struct device_user *dep, enum device_event ev)
 {
 	struct vlan_device *vldev;
@@ -73,6 +79,10 @@ static void vlan_dev_cb(struct device_user *dep, enum device_event ev)
 	case DEV_EVENT_REMOVE:
 		device_set_present(&vldev->dev, false);
 		break;
+	case DEV_EVENT_UPDATE_IFNAME:
+		vlan_dev_set_name(vldev, dep->dev);
+		device_broadcast_event(&vldev->dev, ev);
+		break;
 	default:
 		break;
 	}
@@ -104,7 +114,6 @@ static struct device *get_vlan_device(struct device *dev, int id, bool create)
 		return NULL;
 
 	vldev = calloc(1, sizeof(*vldev));
-	snprintf(vldev->dev.ifname, IFNAMSIZ, "%s.%d", dev->ifname, id);
 
 	device_init_virtual(&vldev->dev, &vlan_type, NULL);
 	vldev->dev.default_config = true;
@@ -113,6 +122,7 @@ static struct device *get_vlan_device(struct device *dev, int id, bool create)
 	vldev->dev.set_state = vlan_set_device_state;
 
 	vldev->id = id;
+	vlan_dev_set_name(vldev, dev);
 
 	vldev->dep.cb = vlan_dev_cb;
 	device_add_user(&vldev->dep, dev);
-- 
2.25.1