networkd vxlan: Add support for enabling UDP checksums

Add UDPCheckSum option to enable transmitting UDP checksums when doing
VXLAN/IPv4. Add UDP6ZeroChecksumRx, and UDP6ZeroChecksumTx
options to enable sending zero checksums and receiving zero
checksums in VXLAN/IPv6

[tomegun: rebase manpage due to whitespace changes]

3 files changed, 33 insertions, 0 deletions

diff --git a/src/network/networkd-netdev-gperf.gperf b/src/network/networkd-netdev-gperf.gperf
index 963c47c3e5..c06344c397 100644
--- a/src/network/networkd-netdev-gperf.gperf
+++ b/src/network/networkd-netdev-gperf.gperf
@@ -47,6 +47,9 @@ VXLAN.ARPProxy,           config_parse_bool,                  0,
 VXLAN.L2MissNotification, config_parse_bool,                  0,                             offsetof(VxLan, l2miss)
 VXLAN.L3MissNotification, config_parse_bool,                  0,                             offsetof(VxLan, l3miss)
 VXLAN.RouteShortCircuit,  config_parse_bool,                  0,                             offsetof(VxLan, route_short_circuit)
+VXLAN.UDPCheckSum,        config_parse_bool,                  0,                             offsetof(VxLan, udpcsum)
+VXLAN.UDP6ZeroCheckSumRx, config_parse_bool,                  0,                             offsetof(VxLan, udp6zerocsumrx)
+VXLAN.UDP6ZeroCheckSumTx, config_parse_bool,                  0,                             offsetof(VxLan, udp6zerocsumtx)
 VXLAN.FDBAgeingSec,       config_parse_sec,                   0,                             offsetof(VxLan, fdb_ageing)
 Tun.OneQueue,             config_parse_bool,                  0,                             offsetof(TunTap, one_queue)
 Tun.MultiQueue,           config_parse_bool,                  0,                             offsetof(TunTap, multi_queue)
diff --git a/src/network/networkd-netdev-vxlan.c b/src/network/networkd-netdev-vxlan.c
index 4a3a51104f..e2c2b108b9 100644
--- a/src/network/networkd-netdev-vxlan.c
+++ b/src/network/networkd-netdev-vxlan.c
@@ -133,6 +133,30 @@ static int netdev_vxlan_fill_message_create(NetDev *netdev, Link *link, sd_rtnl_
                 }
         }
 
+        r = sd_rtnl_message_append_u8(m, IFLA_VXLAN_UDP_CSUM, v->udpcsum);
+        if (r < 0) {
+                log_netdev_error(netdev,
+                                 "Could not append IFLA_VXLAN_UDP_CSUM attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_append_u8(m, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, v->udp6zerocsumtx);
+        if (r < 0) {
+                log_netdev_error(netdev,
+                                 "Could not append IFLA_VXLAN_UDP_ZERO_CSUM6_TX attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_append_u8(m, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, v->udp6zerocsumrx);
+        if (r < 0) {
+                log_netdev_error(netdev,
+                                 "Could not append IFLA_VXLAN_UDP_ZERO_CSUM6_RX attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
         return r;
 }
 
@@ -197,6 +221,9 @@ static void vxlan_init(NetDev *netdev) {
 
         v->id = VXLAN_VID_MAX + 1;
         v->learning = true;
+        v->udpcsum = false;
+        v->udp6zerocsumtx = false;
+        v->udp6zerocsumrx = false;
 }
 
 const NetDevVTable vxlan_vtable = {
diff --git a/src/network/networkd-netdev-vxlan.h b/src/network/networkd-netdev-vxlan.h
index 6339af9add..fe5254e91f 100644
--- a/src/network/networkd-netdev-vxlan.h
+++ b/src/network/networkd-netdev-vxlan.h
@@ -47,6 +47,9 @@ struct VxLan {
         bool route_short_circuit;
         bool l2miss;
         bool l3miss;
+        bool udpcsum;
+        bool udp6zerocsumtx;
+        bool udp6zerocsumrx;
 };
 
 extern const NetDevVTable vxlan_vtable;