X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fnetifd.git;a=blobdiff_plain;f=interface.c;h=f150f7d877ca210667f27f56eb6127b9f62fc805;hp=a4d7b8de2dee7cafe4157d8cabbaf2472337030a;hb=5fbd904e5b4ed87243c09c86adcfb17ae93aa4f5;hpb=4b7662c5841214c105a174fdc9ab9fac870abab9

diff --git a/interface.c b/interface.c
index a4d7b8d..f150f7d 100644
--- a/interface.c
+++ b/interface.c
@@ -35,6 +35,7 @@ enum {
 	IFACE_ATTR_PEERDNS,
 	IFACE_ATTR_DNS,
 	IFACE_ATTR_DNS_SEARCH,
+	IFACE_ATTR_DNS_METRIC,
 	IFACE_ATTR_METRIC,
 	IFACE_ATTR_INTERFACE,
 	IFACE_ATTR_IP6ASSIGN,
@@ -43,7 +44,9 @@ enum {
 	IFACE_ATTR_IP6TABLE,
 	IFACE_ATTR_IP6CLASS,
 	IFACE_ATTR_DELEGATE,
+	IFACE_ATTR_IP6IFACEID,
 	IFACE_ATTR_FORCE_LINK,
+	IFACE_ATTR_IP6WEIGHT,
 	IFACE_ATTR_MAX
 };
 
@@ -56,6 +59,7 @@ static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
 	[IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
 	[IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 	[IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
+	[IFACE_ATTR_DNS_METRIC] = { .name = "dns_metric", .type = BLOBMSG_TYPE_INT32 },
 	[IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
 	[IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
 	[IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
@@ -63,22 +67,23 @@ static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
 	[IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
 	[IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
 	[IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
+	[IFACE_ATTR_IP6IFACEID] = { .name = "ip6ifaceid", .type = BLOBMSG_TYPE_STRING },
 	[IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
-};
-
-static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
-	[IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
-	[IFACE_ATTR_IP6CLASS] = { .type = BLOBMSG_TYPE_STRING },
+	[IFACE_ATTR_IP6WEIGHT] = { .name = "ip6weight", .type = BLOBMSG_TYPE_INT32 },
 };
 
 const struct uci_blob_param_list interface_attr_list = {
 	.n_params = IFACE_ATTR_MAX,
 	.params = iface_attrs,
-	.info = iface_attr_info,
 };
 
 static void
-interface_clear_errors(struct interface *iface)
+set_config_state(struct interface *iface, enum interface_config_state s);
+static void
+interface_event(struct interface *iface, enum interface_event ev);
+
+static void
+interface_error_flush(struct interface *iface)
 {
 	struct interface_error *error, *tmp;
 
@@ -88,6 +93,17 @@ interface_clear_errors(struct interface *iface)
 	}
 }
 
+static void
+interface_clear_errors(struct interface *iface)
+{
+	/* don't flush the errors in case the configured protocol handler matches the
+           running protocol handler and is having the last error capability */
+	if (!(iface->proto &&
+	      (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
+	      (iface->proto->handler->name == iface->proto_handler->name)))
+		interface_error_flush(iface);
+}
+
 void interface_add_error(struct interface *iface, const char *subsystem,
 			 const char *code, const char **data, int n_data)
 {
@@ -96,6 +112,14 @@ void interface_add_error(struct interface *iface, const char *subsystem,
 	int *datalen = NULL;
 	char *dest, *d_subsys, *d_code;
 
+	/* if the configured protocol handler has the last error support capability,
+           errors should only be added if the running protocol handler matches the
+           configured one */
+	if (iface->proto &&
+	    (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
+	    (iface->proto->handler->name != iface->proto_handler->name))
+		return;
+
 	if (n_data) {
 		len = n_data * sizeof(char *);
 		datalen = alloca(len);
@@ -111,6 +135,11 @@ void interface_add_error(struct interface *iface, const char *subsystem,
 	if (!error)
 		return;
 
+	/* Only keep the last flagged error, prevent this list grows unlimitted in case the
+	   protocol can't be established (e.g auth failure) */
+	if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
+		interface_error_flush(iface);
+
 	list_add_tail(&error->list, &iface->errors);
 
 	dest = (char *) &error->data[n_data + 1];
@@ -119,7 +148,7 @@ void interface_add_error(struct interface *iface, const char *subsystem,
 		memcpy(dest, data[i], datalen[i]);
 		dest += datalen[i];
 	}
-	error->data[n_data++] = NULL;
+	error->data[n_data] = NULL;
 
 	if (subsystem)
 		error->subsystem = strcpy(d_subsys, subsystem);
@@ -164,6 +193,9 @@ interface_add_data(struct interface *iface, const struct blob_attr *data)
 	}
 
 	n = calloc(1, sizeof(*n) + len);
+	if (!n)
+		return UBUS_STATUS_UNKNOWN_ERROR;
+
 	memcpy(n->data, data, len);
 	n->node.key = blobmsg_name(n->data);
 	avl_insert(&iface->data, &n->node);
@@ -172,6 +204,25 @@ interface_add_data(struct interface *iface, const struct blob_attr *data)
 	return 0;
 }
 
+int interface_parse_data(struct interface *iface, const struct blob_attr *attr)
+{
+	struct blob_attr *cur;
+	int rem, ret;
+
+	iface->updated = 0;
+
+	blob_for_each_attr(cur, attr, rem) {
+		ret = interface_add_data(iface, cur);
+		if (ret)
+			return ret;
+	}
+
+	if (iface->updated && iface->state == IFS_UP)
+		interface_event(iface, IFEV_UPDATE);
+
+	return 0;
+}
+
 static void
 interface_event(struct interface *iface, enum interface_event ev)
 {
@@ -186,6 +237,7 @@ interface_event(struct interface *iface, enum interface_event ev)
 
 	switch (ev) {
 	case IFEV_UP:
+		interface_error_flush(iface);
 		adev = iface->l3_dev.dev;
 		/* fall through */
 	case IFEV_DOWN:
@@ -212,10 +264,12 @@ mark_interface_down(struct interface *iface)
 	if (state == IFS_DOWN)
 		return;
 
+	iface->link_up_event = false;
 	iface->state = IFS_DOWN;
 	if (state == IFS_UP)
 		interface_event(iface, IFEV_DOWN);
 	interface_ip_set_enabled(&iface->config_ip, false);
+	interface_ip_set_enabled(&iface->proto_ip, false);
 	interface_ip_flush(&iface->proto_ip);
 	interface_flush_state(iface);
 	system_flush_routes();
@@ -235,9 +289,6 @@ __interface_set_down(struct interface *iface, bool force)
 		interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 		if (force)
 			interface_flush_state(iface);
-
-		if (iface->dynamic)
-			vlist_delete(&interfaces, &iface->node);
 		break;
 
 	case IFS_DOWN:
@@ -271,12 +322,16 @@ interface_check_state(struct interface *iface)
 
 	switch (iface->state) {
 	case IFS_UP:
+	case IFS_SETUP:
 		if (!iface->enabled || !link_state) {
-			mark_interface_down(iface);
 			interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
+			mark_interface_down(iface);
 		}
 		break;
 	case IFS_DOWN:
+		if (!iface->available)
+			return;
+
 		if (iface->autostart && iface->enabled && link_state && !config_init)
 			__interface_set_up(iface);
 		break;
@@ -305,10 +360,22 @@ interface_set_link_state(struct interface *iface, bool new_state)
 	netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 	iface->link_state = new_state;
 	interface_check_state(iface);
+
+	if (new_state && iface->force_link && iface->state == IFS_UP && !iface->link_up_event) {
+		interface_event(iface, IFEV_LINK_UP);
+		iface->link_up_event = true;
+	}
+}
+
+static void
+interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
+{
+	if (ev == DEV_EVENT_REMOVE)
+		device_remove_user(dep);
 }
 
 static void
-interface_cb(struct device_user *dep, enum device_event ev)
+interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 {
 	struct interface *iface;
 	bool new_state = false;
@@ -319,7 +386,7 @@ interface_cb(struct device_user *dep, enum device_event ev)
 		new_state = true;
 	case DEV_EVENT_REMOVE:
 		interface_set_available(iface, new_state);
-		if (!new_state && dep->dev->external)
+		if (!new_state && dep->dev && dep->dev->external)
 			interface_set_main_dev(iface, NULL);
 		break;
 	case DEV_EVENT_UP:
@@ -329,7 +396,7 @@ interface_cb(struct device_user *dep, enum device_event ev)
 		break;
 	case DEV_EVENT_LINK_UP:
 		new_state = true;
-        case DEV_EVENT_LINK_DOWN:
+	case DEV_EVENT_LINK_DOWN:
 		interface_set_link_state(iface, new_state);
 		break;
 	case DEV_EVENT_TOPO_CHANGE:
@@ -340,6 +407,25 @@ interface_cb(struct device_user *dep, enum device_event ev)
 	}
 }
 
+static void
+interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
+{
+	struct interface *iface;
+
+	iface = container_of(dep, struct interface, l3_dev);
+	if (iface->l3_dev.dev == iface->main_dev.dev)
+		return;
+
+	switch (ev) {
+	case DEV_EVENT_LINK_DOWN:
+		if (iface->proto_handler->flags & PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN)
+			interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
+		break;
+	default:
+		break;
+	}
+}
+
 void
 interface_set_available(struct interface *iface, bool new_state)
 {
@@ -412,6 +498,11 @@ interface_merge_assignment_data(struct interface *old, struct interface *new)
 {
 	bool changed = (old->assignment_hint != new->assignment_hint ||
 			old->assignment_length != new->assignment_length ||
+			old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
+			old->assignment_weight != new->assignment_weight ||
+			(old->assignment_iface_id_selection == IFID_FIXED &&
+			 memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
+				sizeof(old->assignment_fixed_iface_id))) ||
 			list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 
 	struct interface_assignment_class *c;
@@ -444,6 +535,9 @@ interface_merge_assignment_data(struct interface *old, struct interface *new)
 	if (changed) {
 		old->assignment_hint = new->assignment_hint;
 		old->assignment_length = new->assignment_length;
+		old->assignment_iface_id_selection = new->assignment_iface_id_selection;
+		old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
+		old->assignment_weight = new->assignment_weight;
 		interface_refresh_assignments(true);
 	}
 }
@@ -469,13 +563,27 @@ interface_alias_cb(struct interface_user *dep, struct interface *iface, enum int
 	case IFEV_FREE:
 		interface_remove_user(dep);
 		break;
-	case IFEV_RELOAD:
-	case IFEV_UPDATE:
+	default:
 		break;
 	}
 }
 
 static void
+interface_set_device_config(struct interface *iface, struct device *dev)
+{
+	if (!dev || !dev->default_config)
+		return;
+
+	if (!iface->device_config &&
+	    (!dev->iface_config || dev->config_iface != iface))
+		return;
+
+	dev->config_iface = iface;
+	dev->iface_config = iface->device_config;
+	device_apply_config(dev, dev->type, iface->config);
+}
+
+static void
 interface_claim_device(struct interface *iface)
 {
 	struct interface *parent;
@@ -484,6 +592,8 @@ interface_claim_device(struct interface *iface)
 	if (iface->parent_iface.iface)
 		interface_remove_user(&iface->parent_iface);
 
+	device_lock();
+
 	if (iface->parent_ifname) {
 		parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 		iface->parent_iface.cb = interface_alias_cb;
@@ -491,11 +601,16 @@ interface_claim_device(struct interface *iface)
 	} else if (iface->ifname &&
 		!(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 		dev = device_get(iface->ifname, true);
+		interface_set_device_config(iface, dev);
+	} else {
+		dev = iface->ext_dev.dev;
 	}
 
 	if (dev)
 		interface_set_main_dev(iface, dev);
 
+	device_unlock();
+
 	if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 		interface_set_available(iface, true);
 }
@@ -509,8 +624,8 @@ interface_cleanup_state(struct interface *iface)
 	interface_clear_errors(iface);
 	interface_set_proto_state(iface, NULL);
 
-	if (iface->main_dev.dev)
-		interface_set_main_dev(iface, NULL);
+	interface_set_main_dev(iface, NULL);
+	interface_set_l3_dev(iface, NULL);
 }
 
 static void
@@ -518,6 +633,9 @@ interface_cleanup(struct interface *iface)
 {
 	struct interface_user *dep, *tmp;
 
+	uloop_timeout_cancel(&iface->remove_timer);
+	device_remove_user(&iface->ext_dev);
+
 	if (iface->parent_iface.iface)
 		interface_remove_user(&iface->parent_iface);
 
@@ -567,17 +685,20 @@ interface_handle_config_change(struct interface *iface)
 	}
 	if (iface->autostart && iface->available)
 		interface_set_up(iface);
+	else if (iface->dynamic)
+		set_config_state(iface, IFC_REMOVE);
 }
 
 static void
-interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
+interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 {
 	struct interface *iface = state->iface;
 
 	switch (ev) {
 	case IFPEV_UP:
 		if (iface->state != IFS_SETUP) {
-			interface_event(iface, IFEV_UPDATE);
+			if (iface->state == IFS_UP && iface->updated)
+				interface_event(iface, IFEV_UPDATE);
 			return;
 		}
 
@@ -585,6 +706,7 @@ interface_proto_cb(struct interface_proto_state *state, enum interface_proto_eve
 			interface_set_l3_dev(iface, iface->main_dev.dev);
 
 		interface_ip_set_enabled(&iface->config_ip, true);
+		interface_ip_set_enabled(&iface->proto_ip, true);
 		system_flush_routes();
 		iface->state = IFS_UP;
 		iface->start_time = system_get_rtime();
@@ -629,7 +751,7 @@ void interface_set_proto_state(struct interface *iface, struct interface_proto_s
 	if (!state)
 		return;
 
-	state->proto_event = interface_proto_cb;
+	state->proto_event = interface_proto_event_cb;
 	state->iface = iface;
 }
 
@@ -641,6 +763,7 @@ interface_alloc(const char *name, struct blob_attr *config)
 	struct blob_attr *cur;
 	const char *proto_name = NULL;
 	char *iface_name;
+	bool force_link = false;
 
 	iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 	iface->name = strcpy(iface_name, name);
@@ -652,7 +775,9 @@ interface_alloc(const char *name, struct blob_attr *config)
 	avl_init(&iface->data, avl_strcmp, false, NULL);
 	iface->config_ip.enabled = false;
 
-	iface->main_dev.cb = interface_cb;
+	iface->main_dev.cb = interface_main_dev_cb;
+	iface->l3_dev.cb = interface_l3_dev_cb;
+	iface->ext_dev.cb = interface_ext_dev_cb;
 
 	blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 		      blob_data(config), blob_len(config));
@@ -661,9 +786,11 @@ interface_alloc(const char *name, struct blob_attr *config)
 		proto_name = blobmsg_data(cur);
 
 	proto_attach_interface(iface, proto_name);
+	if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
+		force_link = true;
 
 	iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
-	iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], false);
+	iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 	iface->proto_ip.no_defaultroute =
 		!blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 	iface->proto_ip.no_dns =
@@ -675,12 +802,42 @@ interface_alloc(const char *name, struct blob_attr *config)
 	if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 		interface_add_dns_search_list(&iface->config_ip, cur);
 
+	if ((cur = tb[IFACE_ATTR_DNS_METRIC]))
+		iface->dns_metric = blobmsg_get_u32(cur);
+
 	if ((cur = tb[IFACE_ATTR_METRIC]))
 		iface->metric = blobmsg_get_u32(cur);
 
 	if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 		iface->assignment_length = blobmsg_get_u32(cur);
 
+	/* defaults */
+	iface->assignment_iface_id_selection = IFID_FIXED;
+	iface->assignment_fixed_iface_id = in6addr_any;
+	iface->assignment_fixed_iface_id.s6_addr[15] = 1;
+
+	if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
+		const char *ifaceid = blobmsg_data(cur);
+		if (!strcmp(ifaceid, "random")) {
+			iface->assignment_iface_id_selection = IFID_RANDOM;
+		}
+		else if (!strcmp(ifaceid, "eui64")) {
+			iface->assignment_iface_id_selection = IFID_EUI64;
+		}
+		else {
+			/* we expect an IPv6 address with network id zero here -> fixed iface id
+			   if we cannot parse -> revert to iface id 1 */
+			if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
+					iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
+					iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
+				iface->assignment_fixed_iface_id = in6addr_any;
+				iface->assignment_fixed_iface_id.s6_addr[15] = 1;
+				netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
+							falling back to iface id 1.\n", iface->name);
+			}
+		}
+	}
+
 	iface->assignment_hint = -1;
 	if ((cur = tb[IFACE_ATTR_IP6HINT]))
 		iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
@@ -689,6 +846,8 @@ interface_alloc(const char *name, struct blob_attr *config)
 	if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 		interface_add_assignment_classes(iface, cur);
 
+	if ((cur = tb[IFACE_ATTR_IP6WEIGHT]))
+		iface->assignment_weight = blobmsg_get_u32(cur);
 
 	if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 		if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
@@ -709,6 +868,7 @@ interface_alloc(const char *name, struct blob_attr *config)
 void interface_set_dynamic(struct interface *iface)
 {
 	iface->dynamic = true;
+	iface->autostart = true;
 	iface->node.version = -1; // Don't delete on reload
 }
 
@@ -731,7 +891,6 @@ static bool __interface_add(struct interface *iface, struct blob_attr *config, b
 			iface->ifname = blobmsg_data(cur);
 	}
 
-
 	iface->config = config;
 	vlist_add(&interfaces, &iface->node, iface->name);
 	return true;
@@ -762,13 +921,17 @@ interface_set_l3_dev(struct interface *iface, struct device *dev)
 		return;
 
 	interface_ip_set_enabled(&iface->config_ip, false);
+	interface_ip_set_enabled(&iface->proto_ip, false);
 	interface_ip_flush(&iface->proto_ip);
 	device_add_user(&iface->l3_dev, dev);
 
 	if (dev) {
-		if (claimed)
-			device_claim(&iface->l3_dev);
+		if (claimed) {
+			if (device_claim(&iface->l3_dev) < 0)
+				return;
+		}
 		interface_ip_set_enabled(&iface->config_ip, enabled);
+		interface_ip_set_enabled(&iface->proto_ip, enabled);
 	}
 }
 
@@ -787,8 +950,10 @@ interface_set_main_dev(struct interface *iface, struct device *dev)
 		return;
 	}
 
-	if (claimed)
-		device_claim(&iface->l3_dev);
+	if (claimed) {
+		if (device_claim(&iface->l3_dev) < 0)
+			return;
+	}
 
 	if (!iface->l3_dev.dev)
 		interface_set_l3_dev(iface, dev);
@@ -802,6 +967,9 @@ interface_remove_link(struct interface *iface, struct device *dev)
 	if (mdev && mdev->hotplug_ops)
 		return mdev->hotplug_ops->del(mdev, dev);
 
+	if (dev == iface->ext_dev.dev)
+		device_remove_user(&iface->ext_dev);
+
 	if (!iface->main_dev.hotplug)
 		return UBUS_STATUS_INVALID_ARGUMENT;
 
@@ -812,8 +980,8 @@ interface_remove_link(struct interface *iface, struct device *dev)
 	return 0;
 }
 
-int
-interface_add_link(struct interface *iface, struct device *dev)
+static int
+interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
 {
 	struct device *mdev = iface->main_dev.dev;
 
@@ -830,32 +998,33 @@ interface_add_link(struct interface *iface, struct device *dev)
 			return UBUS_STATUS_NOT_SUPPORTED;
 	}
 
+	if (link_ext)
+		device_add_user(&iface->ext_dev, dev);
+
 	interface_set_main_dev(iface, dev);
 	iface->main_dev.hotplug = true;
 	return 0;
 }
 
 int
-interface_handle_link(struct interface *iface, const char *name, bool add)
+interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
 {
 	struct device *dev;
 	int ret;
 
 	device_lock();
 
-	dev = device_get(name, add ? 2 : 0);
+	dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
 	if (!dev) {
 		ret = UBUS_STATUS_NOT_FOUND;
 		goto out;
 	}
 
 	if (add) {
+		interface_set_device_config(iface, dev);
 		device_set_present(dev, true);
-		if (iface->device_config)
-			device_set_config(dev, &simple_device_type, iface->config);
 
-		system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
-		ret = interface_add_link(iface, dev);
+		ret = interface_add_link(iface, dev, link_ext);
 	} else {
 		ret = interface_remove_link(iface, dev);
 	}
@@ -929,10 +1098,12 @@ set_config_state(struct interface *iface, enum interface_config_state s)
 }
 
 void
-interface_update_start(struct interface *iface)
+interface_update_start(struct interface *iface, const bool keep_old)
 {
 	iface->updated = 0;
-	interface_ip_update_start(&iface->proto_ip);
+
+	if (!keep_old)
+		interface_ip_update_start(&iface->proto_ip);
 }
 
 void
@@ -948,6 +1119,35 @@ interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_set
 	vlist_simple_replace(&new->dns_search, &old->dns_search);
 }
 
+static bool
+interface_device_config_changed(struct interface *if_old, struct interface *if_new)
+{
+	struct blob_attr *ntb[__DEV_ATTR_MAX];
+	struct blob_attr *otb[__DEV_ATTR_MAX];
+	struct device *dev = if_old->main_dev.dev;
+	unsigned long diff = 0;
+
+	BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
+
+	if (!dev)
+		return false;
+
+	if (if_old->device_config != if_new->device_config)
+		return true;
+
+	if (!if_new->device_config)
+		return false;
+
+	blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
+		blob_data(if_old->config), blob_len(if_old->config));
+
+	blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
+		blob_data(if_new->config), blob_len(if_new->config));
+
+	uci_blob_diff(ntb, otb, &device_attr_list, &diff);
+	return diff;
+}
+
 static void
 interface_change_config(struct interface *if_old, struct interface *if_new)
 {
@@ -965,6 +1165,9 @@ interface_change_config(struct interface *if_old, struct interface *if_new)
 		reload = true;
 	}
 
+	if (!reload && interface_device_config_changed(if_old, if_new))
+		reload = true;
+
 	if (FIELD_CHANGED_STR(ifname) ||
 	    if_old->proto_handler != if_new->proto_handler)
 		reload = true;
@@ -983,8 +1186,12 @@ interface_change_config(struct interface *if_old, struct interface *if_new)
 	})
 
 	if_old->config = if_new->config;
-	if (!if_old->config_autostart && if_new->config_autostart)
-		if_old->autostart = true;
+	if (if_old->config_autostart != if_new->config_autostart) {
+		if (if_old->config_autostart)
+			reload = true;
+
+		if_old->autostart = if_new->config_autostart;
+	}
 
 	if_old->device_config = if_new->device_config;
 	if_old->config_autostart = if_new->config_autostart;
@@ -992,6 +1199,7 @@ interface_change_config(struct interface *if_old, struct interface *if_new)
 	if_old->parent_ifname = if_new->parent_ifname;
 	if_old->proto_handler = if_new->proto_handler;
 	if_old->force_link = if_new->force_link;
+	if_old->dns_metric = if_new->dns_metric;
 
 	if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 	interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
@@ -1013,10 +1221,13 @@ interface_change_config(struct interface *if_old, struct interface *if_new)
 	}
 
 	if (reload_ip) {
+		bool config_ip_enabled = if_old->config_ip.enabled;
+		bool proto_ip_enabled = if_old->proto_ip.enabled;
+
 		interface_ip_set_enabled(&if_old->config_ip, false);
 		interface_ip_set_enabled(&if_old->proto_ip, false);
-		interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
-		interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
+		interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
+		interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
 	}
 
 	interface_write_resolv_conf();