networkd,udev: clean up MTU handling

This cleans up handling of MTU values across the codebase. Previously
MTU values where stored sometimes in uint32_t, sometimes in uint16_t,
sometimes unsigned and sometimes in size_t. This now unifies this to
uint32_t across the codebase, as that's what netlink spits out, and what
the majority was already using.

Also, all MTU parameters are now parsed with config_parse_mtu() and
config_parse_ipv6_mtu() is dropped as it is now unneeded.

(Note there is one exception for the MTU typing: in the DCHPv4 code we
continue to process the MTU as uint16_t value, as it is encoded like
that in the protocol, and it's probably better stay close to the
protocol there.)

1 files changed, 1 insertions, 1 deletions

diff --git a/src/network/netdev/geneve.c b/src/network/netdev/geneve.c
index 175acb4cfb..4e865553ec 100644
--- a/src/network/netdev/geneve.c
+++ b/src/network/netdev/geneve.c
@@ -66,7 +66,7 @@ static int netdev_geneve_create(NetDev *netdev) {
                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_ADDRESS attribute: %m");
         }
 
-        if (netdev->mtu) {
+        if (netdev->mtu != 0) {
                 r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
                 if (r < 0)
                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_MTU attribute: %m");