wwan: add support for using oFono as a modem manager

This patch adds core wwan support for ofono, as used by Ubuntu Touch.

Signed-off-by: Mathieu Trudel-Lapierre <mathieu.trudel-lapierre@canonical.com>

https://mail.gnome.org/archives/networkmanager-list/2016-June/msg00089.html

8 files changed, 1755 insertions, 21 deletions

diff --git a/configure.ac b/configure.ac
index e93975b15c..eba3fcc657 100644
--- a/configure.ac
+++ b/configure.ac
@@ -734,6 +734,15 @@ else
 fi
 AM_CONDITIONAL(WITH_BLUEZ5_DUN, test "${enable_bluez5_dun}" = "yes")
 
+# OFONO
+AC_ARG_WITH(ofono, AS_HELP_STRING([--with-ofono], [Enable oFono support]),,[with_ofono=yes])
+if (test "${with_ofono}" = "yes"); then
+	AC_DEFINE(WITH_OFONO, 1, [Define if you have oFono support])
+else
+	AC_DEFINE(WITH_OFONO, 0, [Define if you have oFono support])
+fi
+AM_CONDITIONAL(WITH_OFONO, test "${with_ofono}" = "yes")
+
 # DHCP client support
 AC_ARG_WITH([dhclient], AS_HELP_STRING([--with-dhclient=yes|no|path], [Enable dhclient 4.x support]))
 AC_ARG_WITH([dhcpcd], AS_HELP_STRING([--with-dhcpcd=yes|no|path], [Enable dhcpcd 4.x support]))
diff --git a/src/devices/wwan/Makefile.am b/src/devices/wwan/Makefile.am
index 95e8ec8d60..1d3c7c851d 100644
--- a/src/devices/wwan/Makefile.am
+++ b/src/devices/wwan/Makefile.am
@@ -42,6 +42,13 @@ libnm_wwan_la_SOURCES = \
 	\
 	$(GLIB_GENERATED)
 
+if WITH_OFONO
+libnm_wwan_la_SOURCES += \
+	nm-modem-ofono.c \
+	nm-modem-ofono.h \
+	$(NULL)
+endif
+
 WWAN_SYMBOL_VIS_FILE=$(srcdir)/wwan-exports.ver
 
 libnm_wwan_la_LDFLAGS = \
diff --git a/src/devices/wwan/nm-device-modem.c b/src/devices/wwan/nm-device-modem.c
index 0f96dafbfc..d69804e816 100644
--- a/src/devices/wwan/nm-device-modem.c
+++ b/src/devices/wwan/nm-device-modem.c
@@ -112,6 +112,7 @@ modem_prepare_result (NMModem *modem,
 	if (success)
 		nm_device_activate_schedule_stage2_device_config (device);
 	else {
+
 		if (reason == NM_DEVICE_STATE_REASON_SIM_PIN_INCORRECT) {
 			/* If the connect failed because the SIM PIN was wrong don't allow
 			 * the device to be auto-activated anymore, which would risk locking
@@ -562,6 +563,7 @@ get_ip_iface_identifier (NMDevice *device, NMUtilsIPv6IfaceId *out_iid)
 
 	g_return_val_if_fail (priv->modem, FALSE);
 	success = nm_modem_get_iid (priv->modem, out_iid);
+
 	if (!success)
 		success = NM_DEVICE_CLASS (nm_device_modem_parent_class)->get_ip_iface_identifier (device, out_iid);
 	return success;
diff --git a/src/devices/wwan/nm-modem-manager.c b/src/devices/wwan/nm-modem-manager.c
index 2cfc436f8c..bab2e91810 100644
--- a/src/devices/wwan/nm-modem-manager.c
+++ b/src/devices/wwan/nm-modem-manager.c
@@ -17,7 +17,7 @@
  *
  * Copyright (C) 2009 - 2014 Red Hat, Inc.
  * Copyright (C) 2009 Novell, Inc.
- * Copyright (C) 2009 Canonical Ltd.
+ * Copyright (C) 2009 - 2013 Canonical Ltd.
  */
 
 #include "nm-default.h"
@@ -37,6 +37,10 @@
 #define sd_booted() FALSE
 #endif
 
+#if WITH_OFONO
+#include "nm-modem-ofono.h"
+#endif
+
 #define MODEM_POKE_INTERVAL 120
 
 G_DEFINE_TYPE (NMModemManager, nm_modem_manager, G_TYPE_OBJECT)
@@ -49,6 +53,12 @@ struct _NMModemManagerPrivate {
 	gulong mm_object_added_id;
 	gulong mm_object_removed_id;
 
+#if WITH_OFONO
+	GDBusProxy *ofono_proxy;
+
+	guint ofono_name_owner_changed_id;
+#endif
+
 	/* Common */
 	GHashTable *modems;
 };
@@ -206,6 +216,178 @@ modem_manager_name_owner_changed (MMManager *modem_manager,
 	 * modem_manager_available (self);
 	 */
 }
+#if WITH_OFONO
+static void
+ofono_clear_signals (NMModemManager *self)
+{
+	if (!self->priv->ofono_proxy)
+		return;
+
+	if (self->priv->ofono_name_owner_changed_id) {
+		if (g_signal_handler_is_connected (self->priv->ofono_proxy,
+										   self->priv->ofono_name_owner_changed_id))
+			g_signal_handler_disconnect (self->priv->ofono_proxy,
+										 self->priv->ofono_name_owner_changed_id);
+		self->priv->ofono_name_owner_changed_id = 0;
+	}
+}
+
+static void
+ofono_create_modem (NMModemManager *self, const char *path)
+{
+	NMModem *modem = NULL;
+
+	if (g_hash_table_lookup (self->priv->modems, path)) {
+		nm_log_warn (LOGD_MB, "modem with path %s already exists, ignoring", path);
+		return;
+	}
+
+	/* Create modem instance */
+	modem = nm_modem_ofono_new (path);
+	if (modem)
+		handle_new_modem (self, modem);
+	else
+		nm_log_warn (LOGD_MB, "Failed to create oFono modem for %s", path);
+}
+
+static void
+ofono_signal_cb (GDBusProxy *proxy,
+				 gchar *sender_name,
+				 gchar *signal_name,
+				 GVariant *parameters,
+				 gpointer user_data)
+{
+	NMModemManager *self = NM_MODEM_MANAGER (user_data);
+	gchar *object_path;
+	NMModem *modem;
+
+	if (g_strcmp0 (signal_name, "ModemAdded") == 0) {
+		g_variant_get (parameters, "(oa{sv})", &object_path, NULL);
+		nm_log_info (LOGD_MB, "oFono modem appeared: %s", object_path);
+
+		ofono_create_modem (NM_MODEM_MANAGER (user_data), object_path);
+		g_free (object_path);
+	} else if (g_strcmp0 (signal_name, "ModemRemoved") == 0) {
+		g_variant_get (parameters, "(o)", &object_path);
+		nm_log_info (LOGD_MB, "oFono modem removed: %s", object_path);
+
+		modem = (NMModem *) g_hash_table_lookup (self->priv->modems, object_path);
+		if (modem) {
+			nm_modem_emit_removed (modem);
+			g_hash_table_remove (self->priv->modems, object_path);
+		} else {
+			nm_log_warn (LOGD_MB, "could not remove modem %s, not found in table",
+						 object_path);
+		}
+		g_free (object_path);
+	}
+}
+
+#define OFONO_DBUS_MODEM_ENTRY (dbus_g_type_get_struct ("GValueArray", DBUS_TYPE_G_OBJECT_PATH, DBUS_TYPE_G_MAP_OF_VARIANT, G_TYPE_INVALID))
+#define OFONO_DBUS_MODEM_ENTRIES (dbus_g_type_get_collection ("GPtrArray", OFONO_DBUS_MODEM_ENTRY))
+
+static void
+ofono_enumerate_devices_done (GDBusProxy *proxy, GAsyncResult *res, gpointer user_data)
+{
+	NMModemManager *manager = NM_MODEM_MANAGER (user_data);
+	GError *error = NULL;
+	GVariant *results;
+	GVariantIter *iter;
+	const char *path;
+
+	results = g_dbus_proxy_call_finish (proxy, res, &error);
+	if (results) {
+		g_variant_get (results, "(a(oa{sv}))", &iter);
+		while (g_variant_iter_loop (iter, "(&oa{sv})", &path, NULL)) {
+			ofono_create_modem (manager, path);
+		}
+		g_variant_iter_free (iter);
+		g_variant_unref (results);
+	}
+
+	if (error)
+		nm_log_warn (LOGD_MB, "failed to enumerate oFono devices: %s",
+					 error->message ? error->message : "(unknown)");
+}
+
+static void ofono_appeared (NMModemManager *self);
+
+
+static void
+ofono_check_name_owner (NMModemManager *self)
+{
+	gchar *name_owner;
+
+	name_owner = g_dbus_proxy_get_name_owner (G_DBUS_PROXY (self->priv->ofono_proxy));
+	if (name_owner) {
+		/* Available! */
+		ofono_appeared (self);
+		goto free;
+	}
+
+	nm_log_info (LOGD_MB, "oFono disappeared from bus");
+
+	ofono_clear_signals (self);
+	g_clear_object (&self->priv->ofono_proxy);
+	ensure_client (self);
+
+free:
+	g_free (name_owner);
+	return;
+}
+
+static void
+ofono_name_owner_changed (GDBusProxy *ofono_proxy,
+						  GParamSpec *pspec,
+						  NMModemManager *self)
+{
+	ofono_check_name_owner (self);
+}
+
+static void
+ofono_appeared (NMModemManager *self)
+{
+	nm_log_info (LOGD_MB, "ofono is now available");
+
+	self->priv->ofono_name_owner_changed_id =
+		g_signal_connect (self->priv->ofono_proxy,
+						  "notify::name-owner",
+						  G_CALLBACK (ofono_name_owner_changed),
+						  self);
+	g_dbus_proxy_call (self->priv->ofono_proxy,
+					   "GetModems",
+					   NULL,
+					   G_DBUS_CALL_FLAGS_NONE,
+					   -1,
+					   NULL,
+					   (GAsyncReadyCallback) ofono_enumerate_devices_done,
+					   g_object_ref (self));
+
+	g_signal_connect (self->priv->ofono_proxy,
+					  "g-signal",
+					  G_CALLBACK (ofono_signal_cb),
+					  self);
+}
+
+static void
+ofono_proxy_new_cb (GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+	NMModemManager *self = NM_MODEM_MANAGER (user_data);
+	GError *error = NULL;
+
+	self->priv->ofono_proxy = g_dbus_proxy_new_finish (res, &error);
+
+	if (error) {
+		//FIXME: do stuff if there's an error.
+		return;
+	}
+
+	ofono_appeared (self);
+
+	/* Balance refcount */
+	g_object_unref (self);
+}
+#endif
 
 static void
 modem_manager_poke_cb (GDBusConnection *connection,
@@ -217,19 +399,18 @@ modem_manager_poke_cb (GDBusConnection *connection,
 
 	result = g_dbus_connection_call_finish (connection, res, &error);
 	if (error) {
-		/* Ignore common errors when MM is not installed and such */
-		if (   !g_error_matches (error, G_DBUS_ERROR, G_DBUS_ERROR_SERVICE_UNKNOWN)
-		    && !g_error_matches (error, G_DBUS_ERROR, G_DBUS_ERROR_SPAWN_EXEC_FAILED)
-		    && !g_error_matches (error, G_DBUS_ERROR, G_DBUS_ERROR_SPAWN_FORK_FAILED)
-		    && !g_error_matches (error, G_DBUS_ERROR, G_DBUS_ERROR_SPAWN_FAILED)
-		    && !g_error_matches (error, G_DBUS_ERROR, G_DBUS_ERROR_TIMEOUT)
-		    && !g_error_matches (error, G_DBUS_ERROR, G_DBUS_ERROR_SPAWN_SERVICE_NOT_FOUND)) {
-			nm_log_dbg (LOGD_MB, "error poking ModemManager: %s", error->message);
+		nm_log_warn (LOGD_MB, "error poking ModemManager: %s",
+					error ? error->message : "");
+
+		/* Don't reschedule poke is MM service doesn't exist. */
+		if (!g_error_matches (error, G_DBUS_ERROR, G_DBUS_ERROR_SERVICE_UNKNOWN)
+			&& !g_error_matches (error, G_DBUS_ERROR, G_DBUS_ERROR_SPAWN_SERVICE_NOT_FOUND)) {
+
+			/* Setup timeout to relaunch */
+			schedule_modem_manager_relaunch (self, MODEM_POKE_INTERVAL);
 		}
-		g_error_free (error);
 
-		/* Setup timeout to relaunch */
-		schedule_modem_manager_relaunch (self, MODEM_POKE_INTERVAL);
+		g_error_free (error);
 	} else
 		g_variant_unref (result);
 
@@ -321,22 +502,44 @@ manager_new_ready (GObject *source,
 static void
 ensure_client (NMModemManager *self)
 {
-	g_assert (self->priv->dbus_connection);
+	NMModemManagerPrivate *priv = self->priv;
+	gboolean created = FALSE;
+
+	g_assert (priv->dbus_connection);
 
 	/* Create the GDBusObjectManagerClient. We do not request to autostart, as
 	 * we don't really want the MMManager creation to fail. We can always poke
 	 * later on if we want to request the autostart */
-	if (!self->priv->modem_manager) {
-		mm_manager_new (self->priv->dbus_connection,
+	if (!priv->modem_manager) {
+		mm_manager_new (priv->dbus_connection,
 		                G_DBUS_OBJECT_MANAGER_CLIENT_FLAGS_DO_NOT_AUTO_START,
 		                NULL,
 		                (GAsyncReadyCallback)manager_new_ready,
 		                g_object_ref (self));
-		return;
+		created = TRUE;
+	}
+
+#if WITH_OFONO
+	if (!priv->ofono_proxy) {
+		g_dbus_proxy_new (priv->dbus_connection,
+						  G_DBUS_OBJECT_MANAGER_CLIENT_FLAGS_DO_NOT_AUTO_START,
+						  NULL,
+						  OFONO_DBUS_SERVICE,
+						  OFONO_DBUS_PATH,
+						  OFONO_DBUS_INTERFACE,
+						  NULL,
+						  (GAsyncReadyCallback) ofono_proxy_new_cb,
+						  g_object_ref (self));
+		created = TRUE;
 	}
+#endif /* WITH_OFONO */
+
+	if (created)
+		return;
 
 	/* If already available, recheck name owner! */
 	modem_manager_check_name_owner (self);
+	ofono_check_name_owner (self);
 }
 
 static void
@@ -414,6 +617,12 @@ dispose (GObject *object)
 	nm_clear_g_source (&self->priv->mm_launch_id);
 
 	clear_modem_manager (self);
+
+#if WITH_OFONO
+	ofono_clear_signals (self);
+	g_clear_object (&self->priv->ofono_proxy);
+#endif
+
 	g_clear_object (&self->priv->dbus_connection);
 
 	if (self->priv->modems) {
diff --git a/src/devices/wwan/nm-modem-ofono.c b/src/devices/wwan/nm-modem-ofono.c
new file mode 100644
index 0000000000..2b43b08cc8
--- /dev/null
+++ b/src/devices/wwan/nm-modem-ofono.c
@@ -0,0 +1,1425 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
+/* NetworkManager -- Network link manager
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Copyright (C) 2013 - 2016 Canonical Ltd.
+ */
+
+#include "config.h"
+
+#include <string.h>
+#include <glib/gi18n.h>
+
+#include "nm-default.h"
+#include "nm-core-internal.h"
+
+#include "nm-modem-ofono.h"
+#include "nm-device.h"
+#include "nm-device-private.h"
+#include "nm-setting-connection.h"
+#include "nm-setting-gsm.h"
+#include "nm-settings-connection.h"
+#include "nm-enum-types.h"
+#include "nm-logging.h"
+#include "nm-modem.h"
+#include "nm-platform.h"
+#include "nm-utils.h"
+
+G_DEFINE_TYPE (NMModemOfono, nm_modem_ofono, NM_TYPE_MODEM)
+
+#define NM_MODEM_OFONO_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), NM_TYPE_MODEM_OFONO, NMModemOfonoPrivate))
+
+#define VARIANT_IS_OF_TYPE_BOOLEAN(v)      ((v) != NULL && ( g_variant_is_of_type ((v), G_VARIANT_TYPE_BOOLEAN) ))
+#define VARIANT_IS_OF_TYPE_STRING(v)       ((v) != NULL && ( g_variant_is_of_type ((v), G_VARIANT_TYPE_STRING) ))
+#define VARIANT_IS_OF_TYPE_OBJECT_PATH(v)  ((v) != NULL && ( g_variant_is_of_type ((v), G_VARIANT_TYPE_OBJECT_PATH) ))
+#define VARIANT_IS_OF_TYPE_STRING_ARRAY(v) ((v) != NULL && ( g_variant_is_of_type ((v), G_VARIANT_TYPE_STRING_ARRAY) ))
+#define VARIANT_IS_OF_TYPE_DICTIONARY(v)   ((v) != NULL && ( g_variant_is_of_type ((v), G_VARIANT_TYPE_DICTIONARY) ))
+
+typedef struct {
+	GDBusConnection *dbus_connection;
+
+	GHashTable *connect_properties;
+
+	GDBusProxy *modem_proxy;
+	GDBusProxy *connman_proxy;
+	GDBusProxy *context_proxy;
+	GDBusProxy *sim_proxy;
+
+	GError *property_error;
+
+	char *context_path;
+	char *imsi;
+
+	gboolean modem_online;
+	gboolean gprs_attached;
+
+	NMIP4Config *ip4_config;
+
+} NMModemOfonoPrivate;
+
+#define NM_OFONO_ERROR (nm_ofono_error_quark ())
+
+static GQuark
+nm_ofono_error_quark (void)
+{
+	static GQuark quark = 0;
+	if (!quark)
+		quark = g_quark_from_static_string ("nm-ofono-error");
+	return quark;
+}
+
+static gboolean
+ip_string_to_network_address (const gchar *str,
+                              guint32 *out)
+{
+	guint32 addr = 0;
+	gboolean success = FALSE;
+
+	if (!str || inet_pton (AF_INET, str, &addr) != 1)
+		addr = 0;
+	else
+		success = TRUE;
+
+	*out = (guint32)addr;
+	return success;
+}
+
+static void
+get_capabilities (NMModem *_self,
+                  NMDeviceModemCapabilities *modem_caps,
+                  NMDeviceModemCapabilities *current_caps)
+{
+	NMDeviceModemCapabilities all_ofono_caps = NM_DEVICE_MODEM_CAPABILITY_GSM_UMTS;
+
+	*modem_caps = all_ofono_caps;
+	*current_caps = all_ofono_caps;
+}
+
+static void
+update_modem_state (NMModemOfono *self)
+{
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+	NMModemState state = nm_modem_get_state (NM_MODEM (self));
+	NMModemState new_state = NM_MODEM_STATE_DISABLED;
+	const char *reason = NULL;
+
+	nm_log_info (LOGD_MB, "(%s): %s: 'Attached': %s 'Online': %s 'IMSI': %s",
+	             nm_modem_get_path (NM_MODEM (self)),
+	             __func__,
+	             priv->gprs_attached ? "true" : "false",
+	             priv->modem_online ? "true" : "false",
+	             priv->imsi);
+
+	if (priv->modem_online == FALSE) {
+		reason = "modem 'Online=false'";
+	} else if (priv->imsi == NULL && state != NM_MODEM_STATE_ENABLING) {
+		reason = "modem not ready";
+	} else if (priv->gprs_attached == FALSE) {
+		new_state = NM_MODEM_STATE_SEARCHING;
+		reason = "modem searching";
+	} else {
+		new_state = NM_MODEM_STATE_REGISTERED;
+		reason = "modem ready";
+	}
+
+	if (state != new_state)
+		nm_modem_set_state (NM_MODEM (self), new_state, reason);
+}
+
+/* Disconnect */
+typedef struct {
+	NMModemOfono *self;
+	GSimpleAsyncResult *result;
+	GCancellable *cancellable;
+	gboolean warn;
+} DisconnectContext;
+
+static void
+disconnect_context_complete (DisconnectContext *ctx)
+{
+	g_simple_async_result_complete_in_idle (ctx->result);
+	if (ctx->cancellable)
+		g_object_unref (ctx->cancellable);
+	g_object_unref (ctx->result);
+	g_object_unref (ctx->self);
+	g_slice_free (DisconnectContext, ctx);
+}
+
+static gboolean
+disconnect_context_complete_if_cancelled (DisconnectContext *ctx)
+{
+	GError *error = NULL;
+
+	if (g_cancellable_set_error_if_cancelled (ctx->cancellable, &error)) {
+		g_simple_async_result_take_error (ctx->result, error);
+		disconnect_context_complete (ctx);
+		return TRUE;
+	}
+
+	return FALSE;
+}
+
+static gboolean
+disconnect_finish (NMModem *self,
+                   GAsyncResult *result,
+                   GError **error)
+{
+	return !g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (result), error);
+}
+
+static void
+disconnect_done (GDBusProxy *proxy,
+				 GAsyncResult *result,
+				 gpointer user_data)
+{
+	DisconnectContext *ctx = (DisconnectContext*) user_data;
+	NMModemOfono *self = ctx->self;
+	GError *error = NULL;
+
+
+
+	g_dbus_proxy_call_finish (proxy, result, &error);
+	if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
+		nm_log_dbg (LOGD_MB, "(%s): disconnect cancelled",
+					nm_modem_get_uid (NM_MODEM (self)));
+		return;
+	}
+
+	if (error) {
+		if (ctx->warn)
+			nm_log_warn (LOGD_MB, "(%s) failed to disconnect modem: %s",
+						nm_modem_get_uid (NM_MODEM (self)),
+						error && error->message ? error->message : "(unknown)");
+
+		g_clear_error (&error);
+	}
+
+	nm_log_dbg (LOGD_MB, "(%s): modem disconnected",
+				nm_modem_get_uid (NM_MODEM (self)));
+
+	update_modem_state (self);
+	disconnect_context_complete (ctx);
+}
+
+static void
+disconnect (NMModem *self,
+            gboolean warn,
+            GCancellable *cancellable,
+            GAsyncReadyCallback callback,
+            gpointer user_data)
+{
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+	DisconnectContext *ctx;
+	NMModemState state = nm_modem_get_state (NM_MODEM (self));
+
+	nm_log_dbg (LOGD_MB, "(%s): warn: %s modem_state: %s",
+				nm_modem_get_uid (NM_MODEM (self)),
+				warn ? "TRUE" : "FALSE",
+				nm_modem_state_to_string (state));
+
+	if (state != NM_MODEM_STATE_CONNECTED)
+		return;
+
+	ctx = g_slice_new (DisconnectContext);
+	ctx->self = g_object_ref (self);
+	ctx->warn = warn;
+
+	if (callback)
+		ctx->result = g_simple_async_result_new (G_OBJECT (self),
+												 callback,
+												 user_data,
+												 disconnect);
+	/* Setup cancellable */
+	ctx->cancellable = cancellable ? g_object_ref (cancellable) : NULL;
+	if (disconnect_context_complete_if_cancelled (ctx))
+		return;
+
+	nm_modem_set_state (NM_MODEM (self),
+						NM_MODEM_STATE_DISCONNECTING,
+						nm_modem_state_to_string (NM_MODEM_STATE_DISCONNECTING));
+
+	g_dbus_proxy_call (priv->context_proxy,
+					   "SetProperty",
+					   g_variant_new ("(sv)",
+								      "Active",
+								      g_variant_new ("b", warn)),
+				       G_DBUS_CALL_FLAGS_NONE,
+				       20000,
+				       NULL,
+				       (GAsyncReadyCallback) disconnect_done,
+					   ctx);
+}
+
+static void
+deactivate_cleanup (NMModem *_self, NMDevice *device)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (_self);
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+
+	/* TODO: cancel SimpleConnect() if any */
+
+	g_clear_object (&priv->ip4_config);
+
+	/* Chain up parent's */
+	NM_MODEM_CLASS (nm_modem_ofono_parent_class)->deactivate_cleanup (_self, device);
+}
+
+
+static gboolean
+check_connection_compatible (NMModem *modem,
+							NMConnection *connection)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (modem);
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+	NMSettingConnection *s_con;
+	NMSettingGsm *s_gsm;
+	const char *uuid;
+	const char *id;
+
+	s_con = nm_connection_get_setting_connection (connection);
+	g_assert (s_con);
+
+	uuid = nm_connection_get_uuid (connection);
+	id = nm_connection_get_id (connection);
+
+	s_gsm = nm_connection_get_setting_gsm (connection);
+	if (!s_gsm)
+		return FALSE;
+
+	if (!priv->imsi) {
+		nm_log_warn (LOGD_MB, "ofono (%s): check_connection %s failed: no IMSI",
+					 nm_modem_get_uid (NM_MODEM (self)), id);
+		return FALSE;
+	}
+
+	if (strcmp (nm_setting_connection_get_connection_type (s_con), NM_SETTING_GSM_SETTING_NAME)) {
+		nm_log_dbg (LOGD_MB, "%s (%s) isn't of the right type, skipping.", id, uuid);
+		return FALSE;
+	}
+
+	if (!g_strrstr (id, "/context")) {
+		nm_log_dbg (LOGD_MB, "%s (%s) isn't of the right type, skipping.", id, uuid);
+		return FALSE;
+	}
+
+	if (!g_strrstr (id, priv->imsi)) {
+		nm_log_dbg (LOGD_MB, "%s (%s) isn't for the right SIM, skipping.", id, uuid);
+		return FALSE;
+	}
+
+	nm_log_dbg (LOGD_MB, "(%s): %s is compatible with IMSI %s",
+				nm_modem_get_uid (NM_MODEM (self)), id, priv->imsi);
+
+	return TRUE;
+}
+
+static void
+handle_sim_property (GDBusProxy *proxy,
+					  const char *property,
+					  GVariant *v,
+					  gpointer user_data)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (user_data);
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+
+	if (g_strcmp0 (property, "SubscriberIdentity") == 0 && VARIANT_IS_OF_TYPE_STRING (v)) {
+		gsize length;
+		const char *value_str = g_variant_get_string (v, &length);
+
+		nm_log_dbg (LOGD_MB, "(%s): SubscriberIdentity found", nm_modem_get_uid (NM_MODEM (self)));
+
+		/* Check for empty DBus string value */
+		if (length &&
+			g_strcmp0 (value_str, "(null)") != 0 &&
+			g_strcmp0 (value_str, priv->imsi) != 0) {
+
+			if (priv->imsi != NULL) {
+				nm_log_warn (LOGD_MB, "SimManager:'SubscriberIdentity' changed: %s", priv->imsi);
+				g_free(priv->imsi);
+			}
+
+			priv->imsi = g_strdup (value_str);
+			update_modem_state (self);
+		}
+	}
+}
+
+sim_property_changed (GDBusProxy *proxy,
+					  const char *property,
+					  GVariant *v,
+					  gpointer user_data)
+{
+	GVariant *v_child = g_variant_get_child_value (v, 0);
+
+	handle_sim_property (proxy, property, v_child, user_data);
+	g_variant_unref (v_child);
+}
+
+static void
+sim_get_properties_done (GDBusProxy *proxy, GAsyncResult *result, gpointer user_data)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (user_data);
+	GError *error = NULL;
+	GVariant *v_properties, *v_dict, *v;
+	GVariantIter i;
+	const char *property;
+
+	nm_log_dbg (LOGD_MB, "%s", __func__);
+
+	v_properties = _nm_dbus_proxy_call_finish (proxy,
+											   result,
+											   G_VARIANT_TYPE ("(a{sv})"),
+											   &error);
+	if (!v_properties) {
+		g_dbus_error_strip_remote_error (error);
+		nm_log_warn (LOGD_MB, "(%s) error getting sim properties: %s",
+					 nm_modem_get_uid (NM_MODEM (self)),
+		             error->message);
+		g_error_free (error);
+		return;
+	}
+
+	nm_log_dbg (LOGD_MB, "sim v_properties is type: %s", g_variant_get_type_string (v_properties));
+
+	v_dict = g_variant_get_child_value (v_properties, 0);
+	if (!v_dict) {
+		nm_log_warn (LOGD_MB, "(%s) error getting sim properties: no v_dict",
+					 nm_modem_get_uid (NM_MODEM (self)));
+		return;
+	}
+
+	nm_log_dbg (LOGD_MB, "sim v_dict is type: %s", g_variant_get_type_string (v_dict));
+
+	/*
+	 * TODO:
+	 * 1) optimize by looking up properties ( Online, Interfaces ), instead
+	 *    of iterating
+	 *
+	 * 2) reduce code duplication between all of the get_properties_done
+	 *    functions in this class.
+	 */
+
+	g_variant_iter_init (&i, v_dict);
+	while (g_variant_iter_next (&i, "{&sv}", &property, &v)) {
+		handle_sim_property (NULL, property, v, self);
+		g_variant_unref (v);
+	}
+
+	g_variant_unref (v_dict);
+	g_variant_unref (v_properties);
+}
+
+static void
+handle_sim_iface (NMModemOfono *self, gboolean found)
+{
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+
+	nm_log_dbg (LOGD_MB, "%s: %s", __func__, found ? "TRUE" : "FALSE");
+
+	if (!found && priv->sim_proxy) {
+		nm_log_info (LOGD_MB, "(%s): SimManager interface disappeared",
+					 nm_modem_get_path (NM_MODEM (self)));
+
+		g_signal_handlers_disconnect_by_data (priv->sim_proxy, NM_MODEM_OFONO (self));
+		g_clear_object (&priv->sim_proxy);
+
+		g_free (priv->imsi);
+		priv->imsi = NULL;
+
+		update_modem_state (self);
+	} else if (found && !priv->sim_proxy) {
+		GError *error = NULL;
+		GDBusProxyFlags flags;
+
+		nm_log_info (LOGD_MB, "(%s): found new SimManager interface",
+					 nm_modem_get_path (NM_MODEM (self)));
+
+		flags |= G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES;
+		flags |= G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START;
+
+		priv->sim_proxy = g_dbus_proxy_new_sync (priv->dbus_connection,
+												 flags,
+												 NULL, /* GDBusInterfaceInfo */
+												 OFONO_DBUS_SERVICE,
+												 nm_modem_get_path (NM_MODEM (self)),
+												 OFONO_DBUS_INTERFACE_SIM_MANAGER,
+												 NULL, /* GCancellable */
+												 &error);
+		if (priv->sim_proxy == NULL) {
+			nm_log_warn (LOGD_MB, "(%s) failed to create SimManager proxy: %s",
+						 nm_modem_get_uid (NM_MODEM (self)),
+						 error && error->message ? error->message : "(unknown)");
+
+			g_error_free (error);
+			return;
+		}
+
+		/* Watch for custom ofono PropertyChanged signals */
+		_nm_dbus_signal_connect (priv->sim_proxy,
+								 "PropertyChanged",
+								 G_VARIANT_TYPE ("(sv)"),
+								 G_CALLBACK (sim_property_changed),
+								 self);
+
+		g_dbus_proxy_call (priv->sim_proxy,
+						   "GetProperties",
+						   NULL,
+						   G_DBUS_CALL_FLAGS_NONE,
+						   20000,
+						   NULL,
+						   (GAsyncReadyCallback) sim_get_properties_done,
+						   g_object_ref (self));
+	}
+}
+
+static void
+handle_connman_property (GDBusProxy *proxy,
+					     const char *property,
+						 GVariant *v,
+						 gpointer user_data)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (user_data);
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+
+	if (g_strcmp0 (property, "Attached") == 0 && VARIANT_IS_OF_TYPE_BOOLEAN (v)) {
+		gboolean attached = g_variant_get_boolean (v);
+
+		nm_log_dbg (LOGD_MB, "(%s): Attached: %s",
+					nm_modem_get_uid (NM_MODEM (self)), attached ? "True" : "False");
+
+		if (priv->gprs_attached != attached) {
+			priv->gprs_attached = attached;
+
+			nm_log_info (LOGD_MB, "(%s): %s: new value for 'Attached': %s",
+						nm_modem_get_path (NM_MODEM (self)),
+						__func__,
+						attached ? "true" : "false");
+
+			update_modem_state (self);
+		}
+	}
+}
+
+static void
+connman_property_changed (GDBusProxy *proxy,
+						const char *property,
+						GVariant *v,
+						gpointer user_data)
+{
+	GVariant *v_child = g_variant_get_child_value (v, 0);
+
+	handle_connman_property (proxy, property, v_child, user_data);
+	g_variant_unref (v_child);
+}
+
+static void
+connman_get_properties_done (GDBusProxy *proxy, GAsyncResult *result, gpointer user_data)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (user_data);
+	GError *error = NULL;
+	GVariant *v_properties, *v_dict, *v;
+	GVariantIter i;
+	const char *property;
+
+	nm_log_dbg (LOGD_MB, "%s", __func__);
+
+	v_properties = _nm_dbus_proxy_call_finish (proxy,
+											   result,
+											   G_VARIANT_TYPE ("(a{sv})"),
+											   &error);
+	if (!v_properties) {
+		g_dbus_error_strip_remote_error (error);
+		nm_log_warn (LOGD_MB, "(%s) error getting connman properties: %s",
+					 nm_modem_get_uid (NM_MODEM (self)),
+		             error->message);
+		g_error_free (error);
+		return;
+	}
+
+	v_dict = g_variant_get_child_value (v_properties, 0);
+
+	/*
+	 * TODO:
+	 * 1) optimize by looking up properties ( Online, Interfaces ), instead
+	 *    of iterating
+	 *
+	 * 2) reduce code duplication between all of the get_properties_done
+	 *    functions in this class.
+	 */
+
+	g_variant_iter_init (&i, v_dict);
+	while (g_variant_iter_next (&i, "{&sv}", &property, &v)) {
+		handle_connman_property (NULL, property, v, self);
+		g_variant_unref (v);
+	}
+
+	g_variant_unref (v_dict);
+	g_variant_unref (v_properties);
+}
+
+static void
+handle_connman_iface (NMModemOfono *self, gboolean found)
+{
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+
+	nm_log_dbg (LOGD_MB, "%s: %s", __func__, found ? "TRUE" : "FALSE");
+
+	if (!found && priv->connman_proxy) {
+		nm_log_info (LOGD_MB, "(%s): ConnectionManager interface disappeared",
+					 nm_modem_get_path (NM_MODEM (self)));
+
+		g_signal_handlers_disconnect_by_data (priv->connman_proxy, NM_MODEM_OFONO (self));
+		g_clear_object (&priv->connman_proxy);
+
+		/* The connection manager proxy disappeared, we should
+		 * consider the modem disabled.
+		 */
+		priv->gprs_attached = FALSE;
+
+		update_modem_state (self);
+	} else if (found && !priv->connman_proxy) {
+		GError *error = NULL;
+		GDBusProxyFlags flags;
+
+		nm_log_info (LOGD_MB, "(%s): found new ConnectionManager interface",
+					 nm_modem_get_path (NM_MODEM (self)));
+
+		flags |= G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES;
+		flags |= G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START;
+
+		priv->connman_proxy = g_dbus_proxy_new_sync (priv->dbus_connection,
+													flags,
+													NULL, /* GDBusInterfaceInfo */
+													OFONO_DBUS_SERVICE,
+													nm_modem_get_path (NM_MODEM (self)),
+													OFONO_DBUS_INTERFACE_CONNECTION_MANAGER,
+													NULL, /* GCancellable */
+													&error);
+		if (priv->connman_proxy == NULL) {
+			nm_log_warn (LOGD_MB, "(%s) failed to create ConnectionManager proxy: %s",
+						 nm_modem_get_uid (NM_MODEM (self)),
+						 error && error->message ? error->message : "(unknown)");
+
+			g_error_free (error);
+			return;
+		}
+
+		/* Watch for custom ofono PropertyChanged signals */
+		_nm_dbus_signal_connect (priv->connman_proxy,
+								 "PropertyChanged",
+								 G_VARIANT_TYPE ("(sv)"),
+								 G_CALLBACK (connman_property_changed),
+								 self);
+
+		g_dbus_proxy_call (priv->connman_proxy,
+						   "GetProperties",
+						   NULL,
+						   G_DBUS_CALL_FLAGS_NONE,
+						   20000,
+						   NULL,
+						   (GAsyncReadyCallback) connman_get_properties_done,
+						   g_object_ref (self));
+
+		/* NM 0.9.10x version registers for "ContextAdded/Removed", but
+		 * did nothing but log a message.  Removed for 1.2
+		 */
+	}
+}
+
+static void
+handle_modem_property (GDBusProxy *proxy,
+					   const char *property,
+					   GVariant *v,
+					   gpointer user_data)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (user_data);
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+
+	if ((g_strcmp0 (property, "Online") == 0) && VARIANT_IS_OF_TYPE_BOOLEAN (v)) {
+		gboolean online = g_variant_get_boolean (v);
+
+		nm_log_dbg (LOGD_MB, "(%s): Online: %s",
+					nm_modem_get_uid (NM_MODEM (self)), online ? "True" : "False");
+
+		if (online != priv->modem_online) {
+			priv->modem_online = online;
+
+			nm_log_info (LOGD_MB, "(%s) modem is now %s",
+						nm_modem_get_path (NM_MODEM (self)),
+						online ? "Online" : "Offline");
+
+			update_modem_state (self);
+		}
+
+	} else if ((g_strcmp0 (property, "Interfaces") == 0) && VARIANT_IS_OF_TYPE_STRING_ARRAY (v)) {
+		const char **array, **iter;
+		gboolean found_connman = FALSE;
+		gboolean found_sim = FALSE;
+
+		nm_log_dbg (LOGD_MB, "(%s): Interfaces", nm_modem_get_uid (NM_MODEM (self)));
+
+		array = g_variant_get_strv (v, NULL);
+		if (array) {
+
+			iter = array;
+			while (*iter) {
+
+				if (g_strcmp0 (OFONO_DBUS_INTERFACE_SIM_MANAGER, *iter) == 0)
+					found_sim = TRUE;
+				else if (g_strcmp0 (OFONO_DBUS_INTERFACE_CONNECTION_MANAGER, *iter) == 0)
+					found_connman = TRUE;
+
+				*iter++;
+			}
+
+			g_free (array);
+		}
+
+		handle_sim_iface (self, found_sim);
+		handle_connman_iface (self, found_connman);
+	}
+}
+
+static void
+modem_property_changed (GDBusProxy *proxy,
+						const char *property,
+						GVariant *v,
+						gpointer user_data)
+{
+	GVariant *v_child = g_variant_get_child_value (v, 0);
+
+	handle_modem_property (proxy, property, v_child, user_data);
+	g_variant_unref (v_child);
+}
+
+static void
+modem_get_properties_done (GDBusProxy *proxy, GAsyncResult *result, gpointer user_data)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (user_data);
+	GError *error = NULL;
+	GVariant *v_properties, *v_dict, *v;
+	GVariantIter i;
+	const char *property;
+
+	nm_log_dbg (LOGD_MB, "in %s", __func__);
+
+	v_properties = _nm_dbus_proxy_call_finish (proxy,
+											   result,
+											   G_VARIANT_TYPE ("(a{sv})"),
+											   &error);
+	if (!v_properties) {
+		g_dbus_error_strip_remote_error (error);
+		nm_log_warn (LOGD_MB, "(%s) error getting modem properties: %s",
+					 nm_modem_get_uid (NM_MODEM (self)),
+		             error->message);
+		g_error_free (error);
+		return;
+	}
+
+	v_dict = g_variant_get_child_value (v_properties, 0);
+	if (!v_dict) {
+		nm_log_warn (LOGD_MB, "(%s) error getting modem properties: no v_dict",
+					 nm_modem_get_uid (NM_MODEM (self)));
+		return;
+	}
+
+	/*
+	 * TODO:
+	 * 1) optimize by looking up properties ( Online, Interfaces ), instead
+	 *    of iterating
+	 *
+	 * 2) reduce code duplication between all of the get_properties_done
+	 *    functions in this class.
+	 */
+
+	g_variant_iter_init (&i, v_dict);
+	while (g_variant_iter_next (&i, "{&sv}", &property, &v)) {
+		handle_modem_property (NULL, property, v, self);
+		g_variant_unref (v);
+	}
+
+	g_variant_unref (v_dict);
+	g_variant_unref (v_properties);
+}
+
+NMModem *
+nm_modem_ofono_new (const char *path)
+{
+	g_return_val_if_fail (path != NULL, NULL);
+
+	nm_log_dbg (LOGD_MB, "in %s: path %s", __func__, path);
+
+	return (NMModem *) g_object_new (NM_TYPE_MODEM_OFONO,
+	                                 NM_MODEM_PATH, path,
+	                                 NM_MODEM_UID, (path + 1),
+	                                 NM_MODEM_DEVICE_ID, (path + 1),
+	                                 NM_MODEM_CONTROL_PORT, "ofono", /* mandatory */
+	                                 NM_MODEM_DRIVER, "ofono",
+	                                 NM_MODEM_STATE, NM_MODEM_STATE_INITIALIZING,
+	                                 NULL);
+}
+
+static void
+stage1_prepare_done (GDBusProxy *proxy, GAsyncResult *result, gpointer user_data)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (user_data);
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+	GError *error = NULL;
+
+	nm_log_dbg (LOGD_MB, "in %s", __func__);
+
+	if (priv->connect_properties) {
+		g_hash_table_destroy (priv->connect_properties);
+		priv->connect_properties = NULL;
+	}
+
+	g_dbus_proxy_call_finish (proxy, result, &error);
+
+	if (error) {
+		nm_log_warn (LOGD_MB, "ofono: connection failed: (%d) %s",
+		             error ? error->code : -1,
+		             error && error->message ? error->message : "(unknown)");
+
+		g_signal_emit_by_name (self, NM_MODEM_PREPARE_RESULT, FALSE,
+		                       NM_DEVICE_STATE_REASON_MODEM_BUSY);
+		/*
+		 * FIXME: add code to check for InProgress so that the
+		 * connection doesn't continue to try and activate,
+		 * leading to the connection being disabled, and a 5m
+		 * timeout...
+		 */
+
+		g_clear_error (&error);
+	}
+}
+
+static void
+context_property_changed (GDBusProxy *proxy,
+						  const char *property,
+						  GVariant *v,
+						  gpointer user_data)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (user_data);
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+	NMDeviceStateReason reason = NM_DEVICE_STATE_REASON_NONE;
+	NMPlatformIP4Address addr;
+	gboolean ret = FALSE;
+	GVariant *v_dict;
+	GVariantIter i;
+	const gchar *s, *addr_s;
+	const gchar **array, **iter;
+	guint32 address_network, gateway_network;
+	guint prefix = 0;
+
+	nm_log_dbg (LOGD_MB, "PropertyChanged: %s", property);
+
+	/*
+	 * TODO: might be a good idea and re-factor this to mimic bluez-device,
+	 * ie. have this function just check the key, and call a sub-func to
+	 * handle the action.
+	 */
+
+	if (g_strcmp0 (property, "Settings") != 0)
+		return;
+
+	v_dict = g_variant_get_child_value (v, 0);
+	if (!v_dict) {
+		nm_log_warn (LOGD_MB, "ofono: (%s): error getting IPv4 Settings",
+					 nm_modem_get_uid (NM_MODEM (self)));
+		goto out;
+	}
+
+	nm_log_info (LOGD_MB, "ofono: (%s): IPv4 static Settings:", nm_modem_get_uid (NM_MODEM (self)));
+
+	if (g_variant_lookup (v_dict, "Interface", "&s", &s)) {
+
+		nm_log_dbg (LOGD_MB, "(%s): Interface: %s", nm_modem_get_uid (NM_MODEM (self)), s);
+
+		if (s && strlen (s)) {
+			g_object_set (self,
+						  NM_MODEM_DATA_PORT, g_strdup (s),
+						  NM_MODEM_IP4_METHOD, NM_MODEM_IP_METHOD_STATIC,
+						  NULL);
+		} else {
+			nm_log_warn (LOGD_MB, "ofono: (%s): Settings 'Interface'; empty",
+						nm_modem_get_uid (NM_MODEM (self)));
+			goto out;
+		}
+
+	} else {
+		nm_log_warn (LOGD_MB, "ofono: (%s): Settings 'Interface' missing",
+					 nm_modem_get_uid (NM_MODEM (self)));
+		goto out;
+	}
+
+	/* TODO: verify handling of ip4_config; check other places it's used... */
+	if (priv->ip4_config)
+		g_object_unref (priv->ip4_config);
+
+	memset (&addr, 0, sizeof (addr));
+
+	/*
+	 * TODO:
+	 *
+	 * NM 1.2 changed the NMIP4Config constructor to take an ifindex
+	 * ( vs. void pre 1.2 ), to tie config instance to a specific
+	 * platform interface.
+	 *
+	 * This doesn't work for ofono, as the devices are created
+	 * dynamically ( eg. ril_0, ril_1 ) in NMModemManager.  The
+	 * device created doesn't really map directly to a platform
+	 * link.  The closest would be one of the devices owned by
+	 * rild ( eg. ccmin0 ), which is passed to us above as
+	 * 'Interface'.
+	 *
+	 * This needs discussion with upstream.
+	 */
+	priv->ip4_config = nm_ip4_config_new (0);
+
+	/* TODO: simply if/else error logic! */
+
+	if (g_variant_lookup (v_dict, "Address", "&s", &addr_s)) {
+		nm_log_dbg (LOGD_MB, "(%s): Address: %s", nm_modem_get_uid (NM_MODEM (self)), addr_s);
+
+		if (ip_string_to_network_address (addr_s, &address_network)) {
+			addr.address = address_network;
+			addr.source = NM_IP_CONFIG_SOURCE_WWAN;
+		} else {
+			nm_log_warn (LOGD_MB, "ofono: (%s): can't convert 'Address' %s to addr",
+						 nm_modem_get_uid (NM_MODEM (self)), s);
+			goto out;
+		}
+
+	} else {
+		nm_log_warn (LOGD_MB, "ofono: (%s): Settings 'Address' missing",
+					nm_modem_get_uid (NM_MODEM (self)));
+		goto out;
+	}
+
+	if (g_variant_lookup (v_dict, "Netmask", "&s", &s)) {
+
+		nm_log_dbg (LOGD_MB, "(%s): Netmask: %s", nm_modem_get_uid (NM_MODEM (self)), s);
+
+		if (s && ip_string_to_network_address (s, &address_network)) {
+			prefix = nm_utils_ip4_netmask_to_prefix (address_network);
+			if (prefix > 0)
+				addr.plen = prefix;
+		} else {
+			nm_log_warn (LOGD_MB, "ofono: (%s): invalid 'Netmask': %s",
+						nm_modem_get_uid (NM_MODEM (self)), s);
+			goto out;
+		}
+
+	} else {
+		nm_log_warn (LOGD_MB, "ofono: (%s): Settings 'Netmask' missing",
+					nm_modem_get_uid (NM_MODEM (self)));
+		goto out;
+	}
+
+	nm_log_info (LOGD_MB, "ofono (%s) Address: %s/%d",
+				 nm_modem_get_uid (NM_MODEM (self)), addr_s, prefix);
+
+	nm_ip4_config_add_address (priv->ip4_config, &addr);
+
+	if (g_variant_lookup (v_dict, "Gateway", "&s", &s)) {
+
+		if (s && ip_string_to_network_address (s, &gateway_network)) {
+			nm_log_info (LOGD_MB, "ofono: (%s):  Gateway: %s", nm_modem_get_uid (NM_MODEM (self)), s);
+
+			nm_ip4_config_set_gateway (priv->ip4_config, gateway_network);
+		} else {
+			nm_log_warn (LOGD_MB, "ofono: (%s): invalid 'Gateway': %s",
+						nm_modem_get_uid (NM_MODEM (self)), s);
+			goto out;
+		}
+
+		nm_ip4_config_set_gateway (priv->ip4_config, gateway_network);
+	} else {
+		nm_log_warn (LOGD_MB, "ofono: (%s): Settings 'Gateway' missing",
+					nm_modem_get_uid (NM_MODEM (self)));
+		goto out;
+	}
+
+	if (g_variant_lookup (v_dict, "DomainNameServers", "^a&s", &array)) {
+		iter = array;
+
+		while (*iter) {
+			if (ip_string_to_network_address (*iter, &address_network) && address_network > 0) {
+				nm_log_info (LOGD_MB, "ofono: (%s): DNS: %s",
+							nm_modem_get_uid (NM_MODEM (self)), *iter);
+
+				nm_ip4_config_add_nameserver (priv->ip4_config, address_network);
+			} else {
+				nm_log_warn (LOGD_MB, "ofono: (%s): invalid NameServer: %s",
+							nm_modem_get_uid (NM_MODEM (self)), *iter);
+			}
+
+			*iter++;
+		}
+
+		if (iter == array) {
+			nm_log_warn (LOGD_MB, "ofono: (%s): Settings: 'DomainNameServers': none specified",
+						 nm_modem_get_uid (NM_MODEM (self)));
+			g_free (array);
+			goto out;
+		}
+
+		g_free (array);
+	} else {
+		nm_log_warn (LOGD_MB, "ofono: (%s): Settings 'DomainNameServers' missing",
+					 nm_modem_get_uid (NM_MODEM (self)));
+		goto out;
+	}
+
+	if (g_variant_lookup (v_dict, "MessageProxy", "&s", &s)) {
+		nm_log_info (LOGD_MB, "ofono: (%s): MessageProxy: %s",
+					 nm_modem_get_uid (NM_MODEM (self)), s);
+
+		if (s && ip_string_to_network_address (s, &address_network)) {
+			NMPlatformIP4Route mms_route;
+
+			mms_route.network = address_network;
+			mms_route.plen = 32;
+			mms_route.gateway = gateway_network;
+
+			mms_route.metric = 1;
+
+			nm_ip4_config_add_route (priv->ip4_config, &mms_route);
+		} else {
+			nm_log_warn (LOGD_MB, "ofono: (%s): invalid MessageProxy: %s",
+						nm_modem_get_uid (NM_MODEM (self)), s);
+		}
+	}
+
+	ret = TRUE;
+
+out:
+	if (nm_modem_get_state (NM_MODEM (self)) != NM_MODEM_STATE_CONNECTED) {
+		nm_log_info (LOGD_MB, "ofono: (%s): emitting PREPARE_RESULT: %s",
+					 nm_modem_get_uid (NM_MODEM (self)), ret ? "TRUE" : "FALSE");
+
+		if (!ret)
+			reason = NM_DEVICE_STATE_REASON_IP_CONFIG_UNAVAILABLE;
+
+		g_signal_emit_by_name (self, NM_MODEM_PREPARE_RESULT, ret, reason);
+	} else {
+		nm_log_warn (LOGD_MB, "ofono: (%s): MODEM_PPP_FAILED", nm_modem_get_uid (NM_MODEM (self)));
+
+		g_signal_emit_by_name (self, NM_MODEM_PPP_FAILED, NM_DEVICE_STATE_REASON_PPP_FAILED);
+	}
+}
+
+static NMActStageReturn
+static_stage3_ip4_config_start (NMModem *_self,
+								NMActRequest *req,
+								NMDeviceStateReason *reason)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (_self);
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+	NMActStageReturn ret = NM_ACT_STAGE_RETURN_FAILURE;
+	GError *error = NULL;
+
+	nm_log_dbg (LOGD_MB, "(%s): stage_3_ip4_config_start",
+					nm_modem_get_uid (NM_MODEM (self)));
+
+	if (priv->ip4_config) {
+		nm_log_dbg (LOGD_MB, "(%s): IP4 config is done; setting modem_state -> CONNECTED",
+					nm_modem_get_uid (NM_MODEM (self)));
+
+		g_signal_emit_by_name (self, NM_MODEM_IP4_CONFIG_RESULT, priv->ip4_config, error);
+
+		/* TODO: review!!! */
+		priv->ip4_config = NULL;
+		nm_modem_set_state (NM_MODEM (self),
+							NM_MODEM_STATE_CONNECTED,
+							nm_modem_state_to_string (NM_MODEM_STATE_CONNECTED));
+		ret = NM_ACT_STAGE_RETURN_POSTPONE;
+	}
+
+	return ret;
+}
+
+static void
+context_proxy_new_cb (GDBusProxy *proxy, GAsyncResult *result, gpointer user_data)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (user_data);
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+	GError *error = NULL;
+
+	nm_log_dbg (LOGD_MB, "%s:", __func__);
+
+	priv->context_proxy = g_dbus_proxy_new_finish (result, &error);
+
+	/* TODO: add path to log msg? */
+	if (error) {
+		nm_log_err (LOGD_MB, "(%s) failed to create ofono ConnectionContext DBus proxy: %s",
+					nm_modem_get_uid (NM_MODEM (self)),
+					error->message ? error->message : "(unknown)");
+
+		g_signal_emit_by_name (self, NM_MODEM_PREPARE_RESULT, FALSE,
+		                       NM_DEVICE_STATE_REASON_MODEM_BUSY);
+		return;
+	}
+
+	if (!priv->gprs_attached) {
+		g_signal_emit_by_name (self, NM_MODEM_PREPARE_RESULT, FALSE,
+		                       NM_DEVICE_STATE_REASON_MODEM_NO_CARRIER);
+		return;
+	}
+
+	/* We have an old copy of the settings from a previous activation,
+	 * clear it so that we can gate getting the IP config from oFono
+	 * on whether or not we have already received them
+	 */
+	if (priv->ip4_config)
+		g_clear_object (&priv->ip4_config);
+
+	/* Watch for custom ofono PropertyChanged signals */
+	_nm_dbus_signal_connect (priv->context_proxy,
+							 "PropertyChanged",
+							 G_VARIANT_TYPE ("(sv)"),
+							 G_CALLBACK (context_property_changed),
+							 self);
+
+	g_dbus_proxy_call (priv->context_proxy,
+					   "SetProperty",
+					   g_variant_new ("(sv)",
+								      "Active",
+								      g_variant_new ("b", TRUE)),
+					   G_DBUS_CALL_FLAGS_NONE,
+				       20000,
+				       NULL,
+				       (GAsyncReadyCallback) stage1_prepare_done,
+					   g_object_ref (self));
+}
+
+static void
+do_context_activate (NMModemOfono *self)
+{
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+	GValue value = G_VALUE_INIT;
+
+	g_return_val_if_fail (self != NULL, FALSE);
+	g_return_val_if_fail (NM_IS_MODEM_OFONO (self), FALSE);
+
+	nm_log_dbg (LOGD_MB, "in %s", __func__);
+
+	g_value_init (&value, G_TYPE_BOOLEAN);
+	g_value_set_boolean (&value, TRUE);
+
+	if (priv->context_proxy)
+		g_clear_object (&priv->context_proxy);
+
+	g_dbus_proxy_new (priv->dbus_connection,
+					  G_DBUS_OBJECT_MANAGER_CLIENT_FLAGS_DO_NOT_AUTO_START,
+					  NULL,
+					  OFONO_DBUS_SERVICE,
+					  priv->context_path,
+					  OFONO_DBUS_INTERFACE_CONNECTION_CONTEXT,
+					  NULL,
+					  (GAsyncReadyCallback) context_proxy_new_cb,
+					  g_object_ref (self));
+}
+
+static GHashTable *
+create_connect_properties (NMConnection *connection)
+{
+	NMSettingGsm *setting;
+	GHashTable *properties;
+	const char *str;
+
+	nm_log_dbg (LOGD_MB, "in %s", __func__);
+
+	setting = nm_connection_get_setting_gsm (connection);
+	properties = g_hash_table_new (g_str_hash, g_str_equal);
+
+	str = nm_setting_gsm_get_apn (setting);
+	if (str)
+		g_hash_table_insert (properties, "AccessPointName", g_strdup (str));
+
+	str = nm_setting_gsm_get_username (setting);
+	if (str)
+		g_hash_table_insert (properties, "Username", g_strdup (str));
+
+	str = nm_setting_gsm_get_password (setting);
+	if (str)
+		g_hash_table_insert (properties, "Password", g_strdup (str));
+
+	return properties;
+}
+
+static NMActStageReturn
+act_stage1_prepare (NMModem *modem,
+					NMConnection *connection,
+					NMDeviceStateReason *reason)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (modem);
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+	const char *context_id;
+	char **id = NULL;
+
+	nm_log_dbg (LOGD_MB, "%s", __func__);
+
+	context_id = nm_connection_get_id (connection);
+	id = g_strsplit (context_id, "/", 0);
+	g_assert (id[2]);
+
+	nm_log_dbg (LOGD_MB, " trying %s %s", id[1], id[2]);
+
+	if (priv->context_path)
+		g_free (priv->context_path);
+
+	priv->context_path = g_strdup_printf ("%s/%s",
+										  nm_modem_get_path (modem),
+										  id[2]);
+	g_strfreev (id);
+
+	if (!priv->context_path) {
+		*reason = NM_DEVICE_STATE_REASON_GSM_APN_FAILED;
+			return NM_ACT_STAGE_RETURN_FAILURE;
+	}
+
+	if (priv->connect_properties)
+		g_hash_table_destroy (priv->connect_properties);
+
+	priv->connect_properties = create_connect_properties (connection);
+
+	nm_log_info (LOGD_MB, "(%s): activating context %s",
+	             nm_modem_get_path (modem),
+	             priv->context_path);
+
+	if (nm_modem_get_state (modem) == NM_MODEM_STATE_REGISTERED) {
+		do_context_activate (self);
+	} else {
+		nm_log_warn (LOGD_MB, "(%s): could not activate context, "
+		             "modem is not registered.",
+		             nm_modem_get_path (modem));
+		*reason = NM_DEVICE_STATE_REASON_MODEM_NO_CARRIER;
+		return NM_ACT_STAGE_RETURN_FAILURE;
+	}
+
+	return NM_ACT_STAGE_RETURN_POSTPONE;
+}
+
+static void
+modem_proxy_new_cb (GDBusProxy *proxy, GAsyncResult *result, gpointer user_data)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (user_data);
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+	GError *error = NULL;
+
+	nm_log_dbg (LOGD_MB, "in %s", __func__);
+
+	priv->modem_proxy = g_dbus_proxy_new_finish (result, &error);
+
+	if (error) {
+		nm_log_err (LOGD_MB, "(%s) failed to create ofono modem DBus proxy: %s",
+					nm_modem_get_uid (NM_MODEM (self)),
+					error->message ? error->message : "(unknown)");
+
+		return;
+	}
+
+	/* Watch for custom ofono PropertyChanged signals */
+	_nm_dbus_signal_connect (priv->modem_proxy,
+							 "PropertyChanged",
+							 G_VARIANT_TYPE ("(sv)"),
+							 G_CALLBACK (modem_property_changed),
+							 self);
+
+	g_dbus_proxy_call (priv->modem_proxy,
+					   "GetProperties",
+					   NULL,
+				       G_DBUS_CALL_FLAGS_NONE,
+				       20000,
+				       NULL,
+				       (GAsyncReadyCallback) modem_get_properties_done,
+					   g_object_ref (self));
+
+	g_object_unref (self);
+}
+
+static void
+bus_connected (NMModemOfono *self)
+{
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+
+	nm_log_dbg (LOGD_MB, "in %s", __func__);
+
+	g_dbus_proxy_new (priv->dbus_connection,
+	                  G_DBUS_OBJECT_MANAGER_CLIENT_FLAGS_DO_NOT_AUTO_START,
+	                  NULL,
+	                  OFONO_DBUS_SERVICE,
+					  nm_modem_get_path (NM_MODEM (self)),
+	                  OFONO_DBUS_INTERFACE_MODEM,
+	                  NULL,
+	                  (GAsyncReadyCallback) modem_proxy_new_cb,
+	                  g_object_ref (self));
+}
+
+static void
+bus_get_ready (GObject *source,
+               GAsyncResult *result,
+               NMModemOfono *self)
+{
+	/* Note we always get an extra reference to self here */
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+	GError *error = NULL;
+
+	nm_log_dbg (LOGD_MB, "in %s", __func__);
+
+	priv->dbus_connection = g_bus_get_finish (result, &error);
+	if (!priv->dbus_connection) {
+		nm_log_warn (LOGD_CORE, "error getting bus connection: %s", error->message);
+		g_error_free (error);
+
+		/* FIXME (awe): what do do if bus connection fails??? */
+	} else {
+		/* Got the bus, ensure client */
+		bus_connected (self);
+	}
+
+	/* Balance refcount */
+	g_object_unref (self);
+}
+
+static gboolean
+ensure_bus (NMModemOfono *self)
+{
+	/* FIXME: not sure how dbus_connection could ever be set here? */
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+
+	nm_log_dbg (LOGD_MB, "in %s", __func__);
+
+	if (!priv->dbus_connection)
+		g_bus_get (G_BUS_TYPE_SYSTEM,
+		           NULL,
+		           (GAsyncReadyCallback) bus_get_ready,
+		           g_object_ref (self));
+	else
+		bus_connected (self);
+
+	return FALSE;
+}
+
+static void
+nm_modem_ofono_init (NMModemOfono *self)
+{
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+
+	nm_log_dbg (LOGD_MB, "in %s", __func__);
+
+	priv->dbus_connection = NULL;
+
+	priv->modem_proxy = NULL;
+	priv->connman_proxy = NULL;
+	priv->context_proxy = NULL;
+	priv->sim_proxy = NULL;
+
+	priv->modem_online = FALSE;
+	priv->gprs_attached = FALSE;
+
+	priv->ip4_config = NULL;
+
+	ensure_bus (self);
+}
+
+static GObject*
+constructor (GType type,
+             guint n_construct_params,
+             GObjectConstructParam *construct_params)
+{
+	GObject *object;
+	NMModemOfonoPrivate *priv;
+
+	nm_log_dbg (LOGD_MB, "in %s", __func__);
+
+	object = G_OBJECT_CLASS (nm_modem_ofono_parent_class)->constructor (type, n_construct_params, construct_params);
+	if (!object)
+		return NULL;
+
+	priv = NM_MODEM_OFONO_GET_PRIVATE (object);
+
+	return object;
+}
+
+static void
+dispose (GObject *object)
+{
+	NMModemOfono *self = NM_MODEM_OFONO (object);
+	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+
+	nm_log_dbg (LOGD_MB, "in %s", __func__);
+
+	if (priv->connect_properties) {
+		g_hash_table_destroy (priv->connect_properties);
+		priv->connect_properties = NULL;
+	}
+
+	if (priv->ip4_config)
+		g_clear_object (&priv->ip4_config);
+
+	if (priv->modem_proxy) {
+		g_signal_handlers_disconnect_by_data (priv->modem_proxy, NM_MODEM_OFONO (self));
+		g_clear_object (&priv->modem_proxy);
+	}
+
+	if (priv->connman_proxy)
+		g_clear_object (&priv->connman_proxy);
+	if (priv->context_proxy)
+		g_clear_object (&priv->context_proxy);
+
+	if (priv->sim_proxy) {
+		g_signal_handlers_disconnect_by_data (priv->sim_proxy, NM_MODEM_OFONO (self));
+		g_clear_object (&priv->sim_proxy);
+	}
+
+	g_clear_object (&priv->dbus_connection);
+
+	if (priv->imsi) {
+		g_free (priv->imsi);
+		priv->imsi = NULL;
+	}
+
+	G_OBJECT_CLASS (nm_modem_ofono_parent_class)->dispose (object);
+}
+
+static void
+nm_modem_ofono_class_init (NMModemOfonoClass *klass)
+{
+	GObjectClass *object_class = G_OBJECT_CLASS (klass);
+	NMModemClass *modem_class = NM_MODEM_CLASS (klass);
+
+	nm_log_dbg (LOGD_MB, "in %s", __func__);
+
+	g_type_class_add_private (object_class, sizeof (NMModemOfonoPrivate));
+
+	/* Virtual methods */
+	object_class->constructor = constructor;
+	object_class->dispose = dispose;
+
+	modem_class->get_capabilities = get_capabilities;
+	modem_class->disconnect = disconnect;
+	modem_class->disconnect_finish = disconnect_finish;
+	modem_class->deactivate_cleanup = deactivate_cleanup;
+	modem_class->check_connection_compatible = check_connection_compatible;
+
+	/* same as nm-modem-broadband */
+	modem_class->act_stage1_prepare = act_stage1_prepare;
+
+	/* same as nm-modem-broadband */
+	modem_class->static_stage3_ip4_config_start = static_stage3_ip4_config_start;
+}
diff --git a/src/devices/wwan/nm-modem-ofono.h b/src/devices/wwan/nm-modem-ofono.h
new file mode 100644
index 0000000000..fa79e156c0
--- /dev/null
+++ b/src/devices/wwan/nm-modem-ofono.h
@@ -0,0 +1,64 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
+/* NetworkManager -- Network link manager
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Copyright (C) 2013 - Canonical Ltd.
+ */
+
+#ifndef NM_MODEM_OFONO_H
+#define NM_MODEM_OFONO_H
+
+#include <nm-modem.h>
+
+G_BEGIN_DECLS
+
+#define NM_TYPE_MODEM_OFONO            (nm_modem_ofono_get_type ())
+#define NM_MODEM_OFONO(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), NM_TYPE_MODEM_OFONO, NMModemOfono))
+#define NM_IS_MODEM_OFONO(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), NM_TYPE_MODEM_OFONO))
+#define NM_MODEM_OFONO_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  NM_TYPE_MODEM_OFONO, NMModemOfonoClass))
+#define NM_IS_MODEM_OFONO_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  NM_TYPE_MODEM_OFONO))
+#define NM_MODEM_OFONO_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  NM_TYPE_MODEM_OFONO, NMModemOfonoClass))
+#define NM_MODEM_OFONO_MODEM "modem"
+
+#define OFONO_DBUS_SERVICE                      "org.ofono"
+#define OFONO_DBUS_PATH                         "/"
+#define OFONO_DBUS_INTERFACE                    "org.ofono.Manager"
+#define OFONO_DBUS_INTERFACE_MODEM              "org.ofono.Modem"
+#define OFONO_DBUS_INTERFACE_CONNECTION_MANAGER "org.ofono.ConnectionManager"
+#define OFONO_DBUS_INTERFACE_CONNECTION_CONTEXT "org.ofono.ConnectionContext"
+#define OFONO_DBUS_INTERFACE_SIM_MANAGER        "org.ofono.SimManager"
+
+typedef enum {
+	NM_OFONO_ERROR_CONNECTION_NOT_OFONO = 0,  /*< nick=ConnectionNotOfono >*/
+	NM_OFONO_ERROR_CONNECTION_INVALID,      /*< nick=ConnectionInvalid >*/
+	NM_OFONO_ERROR_CONNECTION_INCOMPATIBLE, /*< nick=ConnectionIncompatible >*/
+} NMOfonoError;
+
+typedef struct {
+	NMModem parent;
+} NMModemOfono;
+
+typedef struct {
+	NMModemClass parent;
+} NMModemOfonoClass;
+
+GType nm_modem_ofono_get_type (void);
+
+NMModem *nm_modem_ofono_new (const char *path);
+
+G_END_DECLS
+
+#endif /* NM_MODEM_OFONO_H */
diff --git a/src/devices/wwan/nm-modem.c b/src/devices/wwan/nm-modem.c
index a6c770072c..2e3d63bb83 100644
--- a/src/devices/wwan/nm-modem.c
+++ b/src/devices/wwan/nm-modem.c
@@ -202,7 +202,9 @@ nm_modem_set_mm_enabled (NMModem *self,
 		return;
 	}
 
-	NM_MODEM_GET_CLASS (self)->set_mm_enabled (self, enabled);
+	/* Not all modem classes support set_mm_enabled */
+	if (NM_MODEM_GET_CLASS (self)->set_mm_enabled)
+		NM_MODEM_GET_CLASS (self)->set_mm_enabled (self, enabled);
 
 	/* Pre-empt the state change signal */
 	nm_modem_set_state (self,
@@ -573,6 +575,8 @@ nm_modem_stage3_ip4_config_start (NMModem *self,
 	const char *method;
 	NMActStageReturn ret;
 
+	nm_log_dbg (LOGD_MB, "ip4_config_start");
+
 	g_return_val_if_fail (NM_IS_MODEM (self), NM_ACT_STAGE_RETURN_FAILURE);
 	g_return_val_if_fail (NM_IS_DEVICE (device), NM_ACT_STAGE_RETURN_FAILURE);
 	g_return_val_if_fail (NM_IS_DEVICE_CLASS (device_class), NM_ACT_STAGE_RETURN_FAILURE);
@@ -602,9 +606,11 @@ nm_modem_stage3_ip4_config_start (NMModem *self,
 		ret = ppp_stage3_ip_config_start (self, req, reason);
 		break;
 	case NM_MODEM_IP_METHOD_STATIC:
+		nm_log_dbg (LOGD_MB, "MODEM_IP_METHOD_STATIC");
 		ret = NM_MODEM_GET_CLASS (self)->static_stage3_ip4_config_start (self, req, reason);
 		break;
 	case NM_MODEM_IP_METHOD_AUTO:
+		nm_log_dbg (LOGD_MB, "MODEM_IP_METHOD_AUTO");
 		ret = device_class->act_stage3_ip4_config_start (device, NULL, reason);
 		break;
 	default:
diff --git a/src/nm-core-utils.c b/src/nm-core-utils.c
index b20653838d..8c5c0a8b44 100644
--- a/src/nm-core-utils.c
+++ b/src/nm-core-utils.c
@@ -2558,7 +2558,13 @@ _get_property_path (const char *ifname,
 	                  ipv6 ? IPV6_PROPERTY_DIR : IPV4_PROPERTY_DIR,
 	                  ifname,
 	                  property);
-	g_assert (len < sizeof (path) - 1);
+
+	/* Ubuntu: don't assert, but log about the inconsistent size. */
+	if (len > sizeof (path) - 1)
+		nm_log_warn (LOGD_CORE,
+					 "IPv6 property path is too long: '"
+					 IPV6_PROPERTY_DIR "%s/%s'",
+					 ifname, property);
 
 	return path;
 }
@@ -2622,9 +2628,15 @@ NM_ASSERT_VALID_PATH_COMPONENT (const char *name)
 
 	nm_log_err (LOGD_CORE, "Failed asserting path component: %s%s%s",
 	            NM_PRINT_FMT_QUOTED (name, "\"", name, "\"", "(null)"));
-	g_error ("FATAL: Failed asserting path component: %s%s%s",
-	         NM_PRINT_FMT_QUOTED (name, "\"", name, "\"", "(null)"));
-	g_assert_not_reached ();
+
+	/* Ubuntu: Don't outright fail, just return the name again. It's
+	 * logged as being invalid, which is enough.
+	 * There is a use of slashes in paths for oFono modems, which are
+	 * actually valid paths to refer to an oFono modem, just don't map to
+	 * anything on the filesystem. The following calls to sysctl paths can
+	 * (and will) fail, but that's fine.
+	 */
+	return name;
 }
 
 gboolean