networkd: introduce ipip tunnel

This patch enables basic ipip tunnel support.
It works with kernel module ipip

example conf:

file: ipip.netdev

[NetDev]
Name=ipip-tun
Kind=ipip
MTUBytes=1480

[Tunnel]
Local=192.168.223.238
Remote=192.169.224.239
TTL=64

file: ipip.network

[Match]
Name=em1

[Network]
Tunnel=ipip-tun

[tomegun:
         - drop unused variable
         - take ref when enslaving]

1 files changed, 6 insertions, 0 deletions

diff --git a/src/network/networkd.c b/src/network/networkd.c
index 6b3bf12a4c..39e1b2af02 100644
--- a/src/network/networkd.c
+++ b/src/network/networkd.c
@@ -87,6 +87,12 @@ int main(int argc, char *argv[]) {
                 goto out;
         }
 
+        r = manager_init_kmod_ctx(m);
+        if (r < 0) {
+                log_error("Could not init kmod context: %s", strerror(-r));
+                goto out;
+        }
+
         r = manager_rtnl_enumerate_links(m);
         if (r < 0) {
                 log_error("Could not enumerate links: %s", strerror(-r));