networkd: rework headers to avoid circular includes

Header files were organized in a way where the includer would add various
typedefs used by the includee before including it, resulting in a tangled
web of dependencies between files.

Replace this with the following logic:

          networkd.h
         /          \
networkd-link.h      \
networkd-ipv4ll.h--\__\
networkd-fdb.h         \
networkd-network.h    netword-netdev-*.h
networkd-route.h           \
                      networkd-netdev.h

If a pointer to a structure defined in a different header file is needed,
use a typedef line instead of including the whole header.

1 files changed, 13 insertions, 4 deletions

diff --git a/src/network/networkd-netdev-tunnel.h b/src/network/networkd-netdev-tunnel.h
index 0d41f80a3c..7d31e7b687 100644
--- a/src/network/networkd-netdev-tunnel.h
+++ b/src/network/networkd-netdev-tunnel.h
@@ -19,7 +19,7 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-typedef struct Tunnel Tunnel;
+#include "in-addr-util.h"
 
 #include "networkd-netdev.h"
 
@@ -37,7 +37,7 @@ typedef enum IPv6FlowLabel {
         _NETDEV_IPV6_FLOWLABEL_INVALID = -1,
 } IPv6FlowLabel;
 
-struct Tunnel {
+typedef struct Tunnel {
         NetDev meta;
 
         uint8_t encap_limit;
@@ -56,8 +56,17 @@ struct Tunnel {
 
         bool pmtudisc;
         bool copy_dscp;
-};
-
+} Tunnel;
+
+DEFINE_NETDEV_CAST(IPIP, Tunnel);
+DEFINE_NETDEV_CAST(GRE, Tunnel);
+DEFINE_NETDEV_CAST(GRETAP, Tunnel);
+DEFINE_NETDEV_CAST(IP6GRE, Tunnel);
+DEFINE_NETDEV_CAST(IP6GRETAP, Tunnel);
+DEFINE_NETDEV_CAST(SIT, Tunnel);
+DEFINE_NETDEV_CAST(VTI, Tunnel);
+DEFINE_NETDEV_CAST(VTI6, Tunnel);
+DEFINE_NETDEV_CAST(IP6TNL, Tunnel);
 extern const NetDevVTable ipip_vtable;
 extern const NetDevVTable sit_vtable;
 extern const NetDevVTable vti_vtable;