libnm: let all property types implement to_dbus_fcn() handler

If a property can be converted to D-Bus, then always set the
to_dbus_fcn() handler. The only caller of to_dbus_fcn() is
property_to_dbus(), so this means that property_to_dbus()
has no more default implementation and always delegates to
to_dbus_fcn().

The code is easier to understand if all properties implement
to_dbus_fcn() the same way.

Also, there is supposed to be a split between NMSettInfoProperty (info about
the property) and NMSettInfoPropertType (the type). The idea is that
each property (obviously) requires its distinct NMSettInfoProperty, but
they can share a common type implementation.
With NMSettInfoPropertType.gprop_to_dbus_fcn that is often violated because
many properties that implement NMSettInfoPropertType.gprop_to_dbus_fcn
require a special type implementation. As such, gprop_to_dbus_fcn should
be part of the property info and not the property type. The first step towards
that is unifying all properties to use to_dbus_fcn().

src/libnm-core-impl/nm-setting-connection.c

@@ -1995,7 +1995,7 @@ nm_setting_connection_class_init(NMSettingConnectionClass *klass)
     _nm_properties_override_gobj(
         properties_override,
         obj_properties[PROP_INTERFACE_NAME],
-        NM_SETT_INFO_PROPERT_TYPE(.dbus_type = G_VARIANT_TYPE_STRING,
+        NM_SETT_INFO_PROPERT_TYPE_GPROP(G_VARIANT_TYPE_STRING,
                                         .missing_from_dbus_fcn =
                                             nm_setting_connection_no_interface_name, ));
 

src/libnm-core-impl/nm-setting-dcb.c

@@ -764,6 +764,7 @@ _nm_setting_dcb_uint_array_from_dbus(GVariant *dbus_value, GValue *prop_value)
 
 static const NMSettInfoPropertType nm_sett_info_propert_type_dcb_au = {
     .dbus_type           = NM_G_VARIANT_TYPE("au"),
+    .to_dbus_fcn         = _nm_setting_property_to_dbus_fcn_gprop,
     .gprop_to_dbus_fcn   = _nm_setting_dcb_uint_array_to_dbus,
     .gprop_from_dbus_fcn = _nm_setting_dcb_uint_array_from_dbus,
 };

src/libnm-core-impl/nm-setting-ip-config.c

@@ -5766,10 +5766,10 @@ _nm_sett_info_property_override_create_array_ip_config(void)
 {
     GArray *properties_override = _nm_sett_info_property_override_create_array();
 
-    _nm_properties_override_gobj(properties_override,
+    _nm_properties_override_gobj(
+        properties_override,
         obj_properties[PROP_GATEWAY],
-                                 NM_SETT_INFO_PROPERT_TYPE(.dbus_type     = G_VARIANT_TYPE_STRING,
+        NM_SETT_INFO_PROPERT_TYPE_GPROP(G_VARIANT_TYPE_STRING, .from_dbus_fcn = ip_gateway_set, ));
-                                                           .from_dbus_fcn = ip_gateway_set, ));
 
     /* ---dbus---
      * property: routing-rules

src/libnm-core-impl/nm-setting-ip4-config.c

@@ -943,7 +943,7 @@ nm_setting_ip4_config_class_init(NMSettingIP4ConfigClass *klass)
     _nm_properties_override_gobj(
         properties_override,
         g_object_class_find_property(G_OBJECT_CLASS(setting_class), NM_SETTING_IP_CONFIG_DNS),
-        NM_SETT_INFO_PROPERT_TYPE(.dbus_type           = NM_G_VARIANT_TYPE("au"),
+        NM_SETT_INFO_PROPERT_TYPE_GPROP(NM_G_VARIANT_TYPE("au"),
                                         .gprop_to_dbus_fcn   = ip4_dns_to_dbus,
                                         .gprop_from_dbus_fcn = ip4_dns_from_dbus, ));
 

src/libnm-core-impl/nm-setting-ip6-config.c

@@ -1012,7 +1012,7 @@ nm_setting_ip6_config_class_init(NMSettingIP6ConfigClass *klass)
     _nm_properties_override_gobj(
         properties_override,
         g_object_class_find_property(G_OBJECT_CLASS(setting_class), NM_SETTING_IP_CONFIG_DNS),
-        NM_SETT_INFO_PROPERT_TYPE(.dbus_type           = NM_G_VARIANT_TYPE("aay"),
+        NM_SETT_INFO_PROPERT_TYPE_GPROP(NM_G_VARIANT_TYPE("aay"),
                                         .gprop_to_dbus_fcn   = ip6_dns_to_dbus,
                                         .gprop_from_dbus_fcn = ip6_dns_from_dbus, ));
 

src/libnm-core-impl/nm-setting-private.h

@@ -265,6 +265,13 @@ gboolean _nm_setting_aggregate(NMSetting *setting, NMConnectionAggregateType typ
 
 gboolean _nm_setting_slave_type_is_valid(const char *slave_type, const char **out_port_type);
 
+GVariant *_nm_setting_property_to_dbus_fcn_gprop(const NMSettInfoSetting *      sett_info,
+                                                 guint                          property_idx,
+                                                 NMConnection *                 connection,
+                                                 NMSetting *                    setting,
+                                                 NMConnectionSerializationFlags flags,
+                                                 const NMConnectionSerializationOptions *options);
+
 GVariant *_nm_setting_to_dbus(NMSetting *                             setting,
                               NMConnection *                          connection,
                               NMConnectionSerializationFlags          flags,
@@ -326,6 +333,11 @@ _nm_setting_class_commit(NMSettingClass *setting_class, NMMetaSettingType meta_t
         &_g;                                                   \
     })
 
+#define NM_SETT_INFO_PROPERT_TYPE_GPROP(_dbus_type, ...)                             \
+    NM_SETT_INFO_PROPERT_TYPE(.dbus_type   = _dbus_type,                             \
+                              .to_dbus_fcn = _nm_setting_property_to_dbus_fcn_gprop, \
+                              __VA_ARGS__)
+
 #define NM_SETT_INFO_PROPERTY(...) (&((const NMSettInfoProperty){__VA_ARGS__}))
 
 gboolean _nm_properties_override_assert(const NMSettInfoProperty *prop_info);

src/libnm-core-impl/nm-setting-serial.c

@@ -311,7 +311,7 @@ nm_setting_serial_class_init(NMSettingSerialClass *klass)
     _nm_properties_override_gobj(
         properties_override,
         obj_properties[PROP_PARITY],
-        NM_SETT_INFO_PROPERT_TYPE(.dbus_type           = G_VARIANT_TYPE_BYTE,
+        NM_SETT_INFO_PROPERT_TYPE_GPROP(G_VARIANT_TYPE_BYTE,
                                         .gprop_to_dbus_fcn   = parity_to_dbus,
                                         .gprop_from_dbus_fcn = parity_from_dbus, ));
 

src/libnm-core-impl/nm-setting-wireless-security.c

@@ -1927,7 +1927,7 @@ nm_setting_wireless_security_class_init(NMSettingWirelessSecurityClass *klass)
     _nm_properties_override_gobj(
         properties_override,
         obj_properties[PROP_WEP_KEY_TYPE],
-        NM_SETT_INFO_PROPERT_TYPE(.dbus_type         = G_VARIANT_TYPE_UINT32,
+        NM_SETT_INFO_PROPERT_TYPE_GPROP(G_VARIANT_TYPE_UINT32,
                                         .gprop_to_dbus_fcn = wep_key_type_to_dbus, ));
 
     /**

src/libnm-core-impl/nm-setting.c

@@ -190,8 +190,10 @@ _nm_properties_override_assert(const NMSettInfoProperty *prop_info)
         /* we always require a dbus_type. */
         nm_assert(property_type->dbus_type);
 
+        if (!property_type->to_dbus_fcn)
+            nm_assert(!property_type->gprop_to_dbus_fcn);
+
         /* {to,from}_dbus_fcn and gprop_{to,from}_dbus_fcn cannot both be set. */
-        nm_assert(!property_type->to_dbus_fcn || !property_type->gprop_to_dbus_fcn);
         nm_assert(!property_type->from_dbus_fcn || !property_type->gprop_from_dbus_fcn);
 
         if (!prop_info->param_spec) {
@@ -378,34 +380,34 @@ _nm_setting_class_commit_full(NMSettingClass *            setting_class,
 
         vtype = p->param_spec->value_type;
         if (vtype == G_TYPE_BOOLEAN)
-            p->property_type = NM_SETT_INFO_PROPERT_TYPE(.dbus_type = G_VARIANT_TYPE_BOOLEAN);
+            p->property_type = NM_SETT_INFO_PROPERT_TYPE_GPROP(G_VARIANT_TYPE_BOOLEAN);
         else if (vtype == G_TYPE_UCHAR)
-            p->property_type = NM_SETT_INFO_PROPERT_TYPE(.dbus_type = G_VARIANT_TYPE_BYTE);
+            p->property_type = NM_SETT_INFO_PROPERT_TYPE_GPROP(G_VARIANT_TYPE_BYTE);
         else if (vtype == G_TYPE_INT)
             p->property_type = &nm_sett_info_propert_type_plain_i;
         else if (vtype == G_TYPE_UINT)
             p->property_type = &nm_sett_info_propert_type_plain_u;
         else if (vtype == G_TYPE_INT64)
-            p->property_type = NM_SETT_INFO_PROPERT_TYPE(.dbus_type = G_VARIANT_TYPE_INT64);
+            p->property_type = NM_SETT_INFO_PROPERT_TYPE_GPROP(G_VARIANT_TYPE_INT64);
         else if (vtype == G_TYPE_UINT64)
-            p->property_type = NM_SETT_INFO_PROPERT_TYPE(.dbus_type = G_VARIANT_TYPE_UINT64);
+            p->property_type = NM_SETT_INFO_PROPERT_TYPE_GPROP(G_VARIANT_TYPE_UINT64);
         else if (vtype == G_TYPE_STRING)
-            p->property_type = NM_SETT_INFO_PROPERT_TYPE(.dbus_type = G_VARIANT_TYPE_STRING);
+            p->property_type = NM_SETT_INFO_PROPERT_TYPE_GPROP(G_VARIANT_TYPE_STRING);
         else if (vtype == G_TYPE_DOUBLE)
-            p->property_type = NM_SETT_INFO_PROPERT_TYPE(.dbus_type = G_VARIANT_TYPE_DOUBLE);
+            p->property_type = NM_SETT_INFO_PROPERT_TYPE_GPROP(G_VARIANT_TYPE_DOUBLE);
         else if (vtype == G_TYPE_STRV)
-            p->property_type = NM_SETT_INFO_PROPERT_TYPE(.dbus_type = G_VARIANT_TYPE_STRING_ARRAY);
+            p->property_type = NM_SETT_INFO_PROPERT_TYPE_GPROP(G_VARIANT_TYPE_STRING_ARRAY);
         else if (vtype == G_TYPE_BYTES) {
             p->property_type =
-                NM_SETT_INFO_PROPERT_TYPE(.dbus_type         = G_VARIANT_TYPE_BYTESTRING,
+                NM_SETT_INFO_PROPERT_TYPE_GPROP(G_VARIANT_TYPE_BYTESTRING,
                                                 .gprop_to_dbus_fcn = _gprop_to_dbus_fcn_bytes);
         } else if (g_type_is_a(vtype, G_TYPE_ENUM)) {
             p->property_type =
-                NM_SETT_INFO_PROPERT_TYPE(.dbus_type         = G_VARIANT_TYPE_INT32,
+                NM_SETT_INFO_PROPERT_TYPE_GPROP(G_VARIANT_TYPE_INT32,
                                                 .gprop_to_dbus_fcn = _gprop_to_dbus_fcn_enum);
         } else if (g_type_is_a(vtype, G_TYPE_FLAGS)) {
             p->property_type =
-                NM_SETT_INFO_PROPERT_TYPE(.dbus_type         = G_VARIANT_TYPE_UINT32,
+                NM_SETT_INFO_PROPERT_TYPE_GPROP(G_VARIANT_TYPE_UINT32,
                                                 .gprop_to_dbus_fcn = _gprop_to_dbus_fcn_flags);
         } else
             nm_assert_not_reached();
@@ -552,6 +554,34 @@ _nm_setting_use_legacy_property(NMSetting * setting,
 
 /*****************************************************************************/
 
+GVariant *
+_nm_setting_property_to_dbus_fcn_gprop(const NMSettInfoSetting *               sett_info,
+                                       guint                                   property_idx,
+                                       NMConnection *                          connection,
+                                       NMSetting *                             setting,
+                                       NMConnectionSerializationFlags          flags,
+                                       const NMConnectionSerializationOptions *options)
+{
+    const NMSettInfoProperty *const property   = &sett_info->property_infos[property_idx];
+    nm_auto_unset_gvalue GValue     prop_value = {
+        0,
+    };
+
+    nm_assert(property->param_spec);
+
+    g_value_init(&prop_value, property->param_spec->value_type);
+
+    g_object_get_property(G_OBJECT(setting), property->param_spec->name, &prop_value);
+
+    if (g_param_value_defaults(property->param_spec, &prop_value))
+        return NULL;
+
+    if (property->property_type->gprop_to_dbus_fcn)
+        return property->property_type->gprop_to_dbus_fcn(&prop_value);
+
+    return g_dbus_gvalue_to_gvariant(&prop_value, property->property_type->dbus_type);
+}
+
 static GVariant *
 property_to_dbus(const NMSettInfoSetting *               sett_info,
                  guint                                   property_idx,
@@ -566,12 +596,15 @@ property_to_dbus(const NMSettInfoSetting *               sett_info,
 
     nm_assert(property->property_type->dbus_type);
 
-    if (!property->param_spec) {
+    if (!property->property_type->to_dbus_fcn) {
-        if (!property->property_type->to_dbus_fcn)
+        nm_assert(!property->param_spec);
+        nm_assert(!property->property_type->gprop_to_dbus_fcn);
         return NULL;
-    } else if (!ignore_flags
+    }
-               && !NM_FLAGS_HAS(property->param_spec->flags,
+
-                                NM_SETTING_PARAM_TO_DBUS_IGNORE_FLAGS)) {
+    if (property->param_spec
+        && (!ignore_flags
+            && !NM_FLAGS_HAS(property->param_spec->flags, NM_SETTING_PARAM_TO_DBUS_IGNORE_FLAGS))) {
         if (!NM_FLAGS_HAS(property->param_spec->flags, G_PARAM_WRITABLE))
             return NULL;
 
@@ -598,32 +631,10 @@ property_to_dbus(const NMSettInfoSetting *               sett_info,
         }
     }
 
-    if (property->property_type->to_dbus_fcn) {
     variant = property->property_type
                   ->to_dbus_fcn(sett_info, property_idx, connection, setting, flags, options);
     nm_g_variant_take_ref(variant);
-    } else {
-        nm_auto_unset_gvalue GValue prop_value = {
-            0,
-        };
 
-        nm_assert(property->param_spec);
-
-        g_value_init(&prop_value, property->param_spec->value_type);
-
-        g_object_get_property(G_OBJECT(setting), property->param_spec->name, &prop_value);
-
-        if (g_param_value_defaults(property->param_spec, &prop_value))
-            return NULL;
-
-        if (property->property_type->gprop_to_dbus_fcn) {
-            variant = property->property_type->gprop_to_dbus_fcn(&prop_value);
-            nm_g_variant_take_ref(variant);
-        } else
-            variant = g_dbus_gvalue_to_gvariant(&prop_value, property->property_type->dbus_type);
-    }
-
-    nm_assert(!variant || !g_variant_is_floating(variant));
     nm_assert(!variant || g_variant_is_of_type(variant, property->property_type->dbus_type));
 
     return variant;
@@ -2334,10 +2345,12 @@ const NMSettInfoPropertType nm_sett_info_propert_type_deprecated_ignore_u = {
 
 const NMSettInfoPropertType nm_sett_info_propert_type_plain_i = {
     .dbus_type   = G_VARIANT_TYPE_INT32,
+    .to_dbus_fcn = _nm_setting_property_to_dbus_fcn_gprop,
 };
 
 const NMSettInfoPropertType nm_sett_info_propert_type_plain_u = {
     .dbus_type   = G_VARIANT_TYPE_UINT32,
+    .to_dbus_fcn = _nm_setting_property_to_dbus_fcn_gprop,
 };
 
 /*****************************************************************************/

src/libnm-core-impl/nm-utils.c

@@ -781,6 +781,7 @@ _nm_utils_strdict_from_dbus(GVariant *dbus_value, GValue *prop_value)
 
 const NMSettInfoPropertType nm_sett_info_propert_type_strdict = {
     .dbus_type           = NM_G_VARIANT_TYPE("a{ss}"),
+    .to_dbus_fcn         = _nm_setting_property_to_dbus_fcn_gprop,
     .gprop_to_dbus_fcn   = _nm_utils_strdict_to_dbus,
     .gprop_from_dbus_fcn = _nm_utils_strdict_from_dbus,
 };
@@ -4156,6 +4157,7 @@ _nm_utils_hwaddr_from_dbus(GVariant *dbus_value, GValue *prop_value)
 
 const NMSettInfoPropertType nm_sett_info_propert_type_mac_address = {
     .dbus_type           = G_VARIANT_TYPE_BYTESTRING,
+    .to_dbus_fcn         = _nm_setting_property_to_dbus_fcn_gprop,
     .gprop_to_dbus_fcn   = _nm_utils_hwaddr_to_dbus,
     .gprop_from_dbus_fcn = _nm_utils_hwaddr_from_dbus,
 };

src/libnm-core-impl/tests/test-setting.c

@@ -4368,7 +4368,13 @@ test_setting_metadata(void)
             g_assert(sip->property_type->dbus_type);
             g_assert(g_variant_type_string_is_valid((const char *) sip->property_type->dbus_type));
 
-            g_assert(!sip->property_type->to_dbus_fcn || !sip->property_type->gprop_to_dbus_fcn);
+            if (!sip->property_type->to_dbus_fcn) {
+                /* it's allowed to have no to_dbus_fcn(), to ignore a property. But such
+                 * properties must not have a param_spec and no gprop_to_dbus_fcn. */
+                g_assert(!sip->param_spec);
+                g_assert(!sip->property_type->gprop_to_dbus_fcn);
+            }
+
             g_assert(!sip->property_type->from_dbus_fcn
                      || !sip->property_type->gprop_from_dbus_fcn);