networkd: tie links to rtnl rather than udev

This essentially swaps the roles of rtnl and udev in networkd. After this
change libudev is only used for waiting for udev to initialize devices and
to get udev-specific information needed for some [Match] attributes.

This in particular simplifies the code in containers where udev is not really
useful, but also simplifies things and reduces round-trips in the non-container
case.

1 files changed, 8 insertions, 64 deletions

diff --git a/src/network/networkd-netdev.c b/src/network/networkd-netdev.c
index 92548d96f0..b7fc48db94 100644
--- a/src/network/networkd-netdev.c
+++ b/src/network/networkd-netdev.c
@@ -161,67 +161,6 @@ static int netdev_enter_ready(NetDev *netdev) {
 
         return 0;
 }
-
-static int netdev_getlink_handler(sd_rtnl *rtnl, sd_rtnl_message *m,
-                                void *userdata) {
-        NetDev *netdev = userdata;
-        int r;
-
-        assert(netdev);
-
-        if (netdev->state == NETDEV_STATE_FAILED)
-                return 1;
-
-        r = sd_rtnl_message_get_errno(m);
-        if (r < 0) {
-                log_struct_netdev(LOG_ERR, netdev,
-                                "MESSAGE=%s: could not get link: %s",
-                                netdev->name, strerror(-r),
-                                "ERRNO=%d", -r,
-                                NULL);
-                return 1;
-        }
-
-        netdev_set_ifindex(netdev, m);
-
-        return 1;
-}
-
-static int netdev_getlink(NetDev *netdev) {
-        _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
-        int r;
-
-        assert(netdev->manager);
-        assert(netdev->manager->rtnl);
-        assert(netdev->name);
-
-        log_debug_netdev(netdev, "requesting netdev status");
-
-        r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req,
-                                     RTM_GETLINK, 0);
-        if (r < 0) {
-                log_error_netdev(netdev, "Could not allocate RTM_GETLINK message");
-                return r;
-        }
-
-        r = sd_rtnl_message_append_string(req, IFLA_IFNAME, netdev->name);
-        if (r < 0) {
-                log_error_netdev(netdev, "Colud not append ifname to message: %s",
-                                 strerror(-r));
-                return r;
-        }
-
-        r = sd_rtnl_call_async(netdev->manager->rtnl, req, netdev_getlink_handler,
-                               netdev, 0, NULL);
-        if (r < 0) {
-                log_error_netdev(netdev,
-                               "Could not send rtnetlink message: %s", strerror(-r));
-                return r;
-        }
-
-        return 0;
-}
-
 static int netdev_create_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
         NetDev *netdev = userdata;
         int r;
@@ -230,9 +169,8 @@ static int netdev_create_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userda
 
         r = sd_rtnl_message_get_errno(m);
         if (r == -EEXIST)
-                r = netdev_getlink(netdev);
-
-        if (r < 0) {
+                log_debug_netdev(netdev, "netdev exists, using existing");
+        else if (r < 0) {
                 log_warning_netdev(netdev, "netdev failed: %s", strerror(-r));
                 netdev_enter_failed(netdev);
 
@@ -410,6 +348,12 @@ int netdev_set_ifindex(NetDev *netdev, sd_rtnl_message *message) {
                 return r;
         }
 
+        r = sd_rtnl_message_exit_container(message);
+        if (r < 0) {
+                log_error_netdev(netdev, "Could not exit container");
+                return r;
+        }
+
         kind = netdev_kind_to_string(netdev->kind);
         if (!kind) {
                 log_error_netdev(netdev, "Could not get kind");