platform: move the management of the genl socket to linux-platform

We're fine with a single genl socket instead of opening a new one for each
WifiData instance.

src/platform/nm-linux-platform.c

@@ -317,6 +317,7 @@ static void cache_on_change (NMPlatform *platform,
                              const NMPObject *obj_new);
 static void cache_prune_all (NMPlatform *platform);
 static gboolean event_handler_read_netlink (NMPlatform *platform, gboolean wait_for_acks);
+static struct nl_sock *_genl_sock (NMLinuxPlatform *platform);
 
 /*****************************************************************************/
 
@@ -1936,7 +1937,9 @@ _new_from_nl_link (NMPlatform *platform, const NMPCache *cache, struct nlmsghdr
 			obj->_link.wifi_data = nm_wifi_utils_wext_new (ifi->ifi_index, FALSE);
 #endif
 		} else {
-			obj->_link.wifi_data = nm_wifi_utils_new (ifi->ifi_index, TRUE);
+			obj->_link.wifi_data = nm_wifi_utils_new (ifi->ifi_index,
+			                                          _genl_sock (NM_LINUX_PLATFORM (platform)),
+			                                          TRUE);
 		}
 	}
 
@@ -2994,6 +2997,8 @@ typedef struct {
 } DelayedActionWaitForNlResponseData;
 
 typedef struct {
+	struct nl_sock *genl;
+
 	struct nl_sock *nlh;
 	guint32 nlh_seq_next;
 #ifdef NM_MORE_LOGGING
@@ -3064,6 +3069,14 @@ nm_linux_platform_setup (void)
 
 /*****************************************************************************/
 
+static struct nl_sock *
+_genl_sock (NMLinuxPlatform *platform)
+{
+	NMLinuxPlatformPrivate *priv = NM_LINUX_PLATFORM_GET_PRIVATE (platform);
+
+	return priv->genl;
+}
+
 #define ASSERT_SYSCTL_ARGS(pathid, dirfd, path) \
 	G_STMT_START { \
 		const char *const _pathid = (pathid); \
@@ -7049,6 +7062,18 @@ constructed (GObject *_object)
 	                                   nmp_netns_get_current () == nmp_netns_get_initial () ? "/main" : "")),
 	       nm_platform_get_use_udev (platform) ? "use" : "no");
 
+
+	priv->genl = nl_socket_alloc ();
+	g_assert (priv->genl);
+
+	nle = nl_connect (priv->genl, NETLINK_GENERIC);
+	if (nle) {
+		_LOGE ("unable to connect the generic netlink socket \"%s\" (%d)",
+		       nl_geterror (nle), -nle);
+		nl_socket_free (priv->genl);
+		priv->genl = NULL;
+	}
+
 	priv->nlh = nl_socket_alloc ();
 	g_assert (priv->nlh);
 
@@ -7167,6 +7192,8 @@ finalize (GObject *object)
 	g_ptr_array_unref (priv->delayed_action.list_refresh_link);
 	g_array_unref (priv->delayed_action.list_wait_for_nl_response);
 
+	nl_socket_free (priv->genl);
+
 	g_source_remove (priv->event_id);
 	g_io_channel_unref (priv->event_channel);
 	nl_socket_free (priv->nlh);

src/platform/wifi/nm-wifi-utils-nl80211.c

@@ -174,10 +174,6 @@ dispose (GObject *object)
 {
 	NMWifiUtilsNl80211 *nl80211 = NM_WIFI_UTILS_NL80211 (object);
 
-	if (nl80211->nl_sock) {
-		nl_socket_free (nl80211->nl_sock);
-		nl80211->nl_sock = NULL;
-	}
 	g_clear_pointer (&nl80211->freqs, g_free);
 }
 
@@ -931,13 +927,16 @@ nm_wifi_utils_nl80211_class_init (NMWifiUtilsNl80211Class *klass)
 }
 
 NMWifiUtils *
-nm_wifi_utils_nl80211_new (int ifindex)
+nm_wifi_utils_nl80211_new (int ifindex, struct nl_sock *genl)
 {
 	NMWifiUtilsNl80211 *nl80211;
 	nm_auto_nlmsg struct nl_msg *msg = NULL;
 	struct nl80211_device_info device_info = {};
 	char ifname[IFNAMSIZ];
 
+	if (!genl)
+		return NULL;
+
 	if (!nmp_utils_if_indextoname (ifindex, ifname)) {
 		_LOGW (LOGD_PLATFORM | LOGD_WIFI,
 		       "can't determine interface name for ifindex %d", ifindex);
@@ -947,12 +946,7 @@ nm_wifi_utils_nl80211_new (int ifindex)
 	nl80211 = g_object_new (NM_TYPE_WIFI_UTILS_NL80211, NULL);
 
 	nl80211->parent.ifindex = ifindex;
-	nl80211->nl_sock = nl_socket_alloc ();
-	if (nl80211->nl_sock == NULL)
-		goto error;
-
-	if (nl_connect (nl80211->nl_sock, NETLINK_GENERIC))
-		goto error;
+	nl80211->nl_sock = genl;
 
 	nl80211->id = genl_ctrl_resolve (nl80211->nl_sock, "nl80211");
 	if (nl80211->id < 0) {

src/platform/wifi/nm-wifi-utils-nl80211.h

@@ -23,6 +23,7 @@
 #define __WIFI_UTILS_NL80211_H__
 
 #include "nm-wifi-utils.h"
+#include "platform/nm-netlink.h"
 
 #define NM_TYPE_WIFI_UTILS_NL80211            (nm_wifi_utils_nl80211_get_type ())
 #define NM_WIFI_UTILS_NL80211(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), NM_TYPE_WIFI_UTILS_NL80211, NMWifiUtilsNl80211))
@@ -33,6 +34,6 @@
 
 GType nm_wifi_utils_nl80211_get_type (void);
 
-NMWifiUtils *nm_wifi_utils_nl80211_new (int ifindex);
+NMWifiUtils *nm_wifi_utils_nl80211_new (int ifindex, struct nl_sock *genl);
 
 #endif  /* __WIFI_UTILS_NL80211_H__ */

src/platform/wifi/nm-wifi-utils.c

@@ -52,13 +52,13 @@ nm_wifi_utils_class_init (NMWifiUtilsClass *klass)
 }
 
 NMWifiUtils *
-nm_wifi_utils_new (int ifindex, gboolean check_scan)
+nm_wifi_utils_new (int ifindex, struct nl_sock *genl, gboolean check_scan)
 {
 	NMWifiUtils *ret;
 
 	g_return_val_if_fail (ifindex > 0, NULL);
 
-	ret = nm_wifi_utils_nl80211_new (ifindex);
+	ret = nm_wifi_utils_nl80211_new (ifindex, genl);
 
 #if HAVE_WEXT
 	if (ret == NULL)

src/platform/wifi/nm-wifi-utils.h

@@ -26,6 +26,7 @@
 
 #include "nm-dbus-interface.h"
 #include "nm-setting-wireless.h"
+#include "platform/nm-netlink.h"
 
 typedef struct NMWifiUtils NMWifiUtils;
 
@@ -40,7 +41,7 @@ GType nm_wifi_utils_get_type (void);
 
 gboolean nm_wifi_utils_is_wifi (int dirfd, const char *ifname);
 
-NMWifiUtils *nm_wifi_utils_new (int ifindex, gboolean check_scan);
+NMWifiUtils *nm_wifi_utils_new (int ifindex, struct nl_sock *genl, gboolean check_scan);
 
 NMDeviceWifiCapabilities nm_wifi_utils_get_caps (NMWifiUtils *data);