network: introduce reference counter for Network object

src/network/networkd-manager.c

@@ -1458,7 +1458,7 @@ void manager_free(Manager *m) {
 
         m->duids_requesting_uuid = set_free(m->duids_requesting_uuid);
         while ((network = m->networks))
-                network_free(network);
+                network_unref(network);
         hashmap_free(m->networks_by_name);
 
         m->netdevs = hashmap_free_with_destructor(m->netdevs, netdev_unref);

src/network/networkd-network.c

@@ -298,7 +298,7 @@ int network_verify(Network *network) {
 
 int network_load_one(Manager *manager, const char *filename) {
         _cleanup_free_ char *fname = NULL, *name = NULL;
-        _cleanup_(network_freep) Network *network = NULL;
+        _cleanup_(network_unrefp) Network *network = NULL;
         _cleanup_fclose_ FILE *file = NULL;
         const char *dropin_dirname;
         char *d;
@@ -344,6 +344,8 @@ int network_load_one(Manager *manager, const char *filename) {
                 .filename = TAKE_PTR(fname),
                 .name = TAKE_PTR(name),
 
+                .n_ref = 1,
+
                 .required_for_online = true,
                 .required_operstate_for_online = LINK_OPERSTATE_DEGRADED,
                 .dhcp = ADDRESS_FAMILY_NO,
@@ -473,7 +475,7 @@ int network_load(Manager *manager) {
         assert(manager);
 
         while ((network = manager->networks))
-                network_free(network);
+                network_unref(network);
 
         r = conf_files_list_strv(&files, ".network", NULL, 0, NETWORK_DIRS);
         if (r < 0)
@@ -488,7 +490,7 @@ int network_load(Manager *manager) {
         return 0;
 }
 
-void network_free(Network *network) {
+static Network *network_free(Network *network) {
         IPv6ProxyNDPAddress *ipv6_proxy_ndp_address;
         RoutingPolicyRule *rule;
         FdbEntry *fdb_entry;
@@ -499,7 +501,7 @@ void network_free(Network *network) {
         Route *route;
 
         if (!network)
-                return;
+                return NULL;
 
         free(network->filename);
 
@@ -586,9 +588,11 @@ void network_free(Network *network) {
 
         set_free_free(network->dnssec_negative_trust_anchors);
 
-        free(network);
+        return mfree(network);
 }
 
+DEFINE_TRIVIAL_REF_UNREF_FUNC(Network, network, network_free);
+
 int network_get_by_name(Manager *manager, const char *name, Network **ret) {
         Network *network;
 

src/network/networkd-network.h

@@ -92,6 +92,8 @@ struct Network {
         char *filename;
         char *name;
 
+        unsigned n_ref;
+
         Set *match_mac;
         char **match_path;
         char **match_driver;
@@ -278,9 +280,9 @@ struct Network {
         LIST_FIELDS(Network, networks);
 };
 
-void network_free(Network *network);
-
-DEFINE_TRIVIAL_CLEANUP_FUNC(Network*, network_free);
+Network *network_ref(Network *network);
+Network *network_unref(Network *network);
+DEFINE_TRIVIAL_CLEANUP_FUNC(Network*, network_unref);
 
 int network_load(Manager *manager);
 int network_load_one(Manager *manager, const char *filename);

src/network/test-networkd-conf.c

@@ -169,9 +169,10 @@ static void test_config_parse_hwaddr(void) {
 }
 
 static void test_config_parse_address_one(const char *rvalue, int family, unsigned n_addresses, const union in_addr_union *u, unsigned char prefixlen) {
-        _cleanup_(network_freep) Network *network = NULL;
+        _cleanup_(network_unrefp) Network *network = NULL;
 
         assert_se(network = new0(Network, 1));
+        network->n_ref = 1;
         assert_se(network->filename = strdup("hogehoge.network"));
         assert_se(config_parse_ifnames("network", "filename", 1, "section", 1, "Name", 0, "*", &network->match_name, network) == 0);
         assert_se(config_parse_address("network", "filename", 1, "section", 1, "Address", 0, rvalue, network, network) == 0);