networkd: clean up vlan handling a bit (#3478)

Let's add a generic parser for VLAN ids, which should become handy as
preparation for PR #3428. Let's also make sure we use uint16_t for the vlan ID
type everywhere, and that validity checks are already applied at the time of
parsing, and not only whne we about to prepare a netdev.

Also, establish a common definition VLANID_INVALID we can use for
non-initialized VLAN id fields.

1 files changed, 1 insertions, 3 deletions

diff --git a/src/network/networkd-netdev-vlan.h b/src/network/networkd-netdev-vlan.h
index 73aacf4a0f..2dfe314b6e 100644
--- a/src/network/networkd-netdev-vlan.h
+++ b/src/network/networkd-netdev-vlan.h
@@ -23,12 +23,10 @@ typedef struct VLan VLan;
 
 #include "networkd-netdev.h"
 
-#define VLANID_MAX 4094
-
 struct VLan {
         NetDev meta;
 
-        uint64_t id;
+        uint16_t id;
 };
 
 DEFINE_NETDEV_CAST(VLAN, VLan);