networkd: introduce vti tunnel

This patch enables vti tunnel support.

example conf:

file : vti.netdev
[NetDev]
Name=vti-tun
Kind=vti
MTUBytes=1480

[Tunnel]
Local=X.X.X.X
Remote=X.X.X.X

file: vti.network
[Match]
Name=em1

[Network]
Tunnel=vti-tun

TODO:

Add more attributes for vti tunnel
IFLA_VTI_IKEY
IFLA_VTI_OKEY

4 files changed, 103 insertions, 3 deletions

diff --git a/src/network/networkd-netdev.c b/src/network/networkd-netdev.c
index 4439374a67..1519419c1f 100644
--- a/src/network/networkd-netdev.c
+++ b/src/network/networkd-netdev.c
@@ -39,6 +39,7 @@ static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
         [NETDEV_KIND_GRE] = "gre",
         [NETDEV_KIND_SIT] = "sit",
         [NETDEV_KIND_VETH] = "veth",
+        [NETDEV_KIND_VTI] = "vti"
 };
 
 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
@@ -393,7 +394,8 @@ int netdev_enslave(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callbac
 
         if(netdev->kind == NETDEV_KIND_IPIP ||
            netdev->kind == NETDEV_KIND_GRE ||
-           netdev->kind ==  NETDEV_KIND_SIT)
+           netdev->kind ==  NETDEV_KIND_SIT ||
+           netdev->kind ==  NETDEV_KIND_VTI)
                 return netdev_create_tunnel(link, netdev_create_handler);
 
         if (netdev->state == NETDEV_STATE_READY) {
@@ -606,7 +608,8 @@ static int netdev_load_one(Manager *manager, const char *filename) {
             netdev->kind != NETDEV_KIND_MACVLAN &&
             netdev->kind != NETDEV_KIND_IPIP &&
             netdev->kind != NETDEV_KIND_GRE &&
-            netdev->kind != NETDEV_KIND_SIT) {
+            netdev->kind != NETDEV_KIND_SIT &&
+            netdev->kind != NETDEV_KIND_VTI) {
                 r = netdev_create(netdev, NULL, NULL);
                 if (r < 0)
                         return r;
diff --git a/src/network/networkd-network.c b/src/network/networkd-network.c
index a6cbee2397..f42fc171bd 100644
--- a/src/network/networkd-network.c
+++ b/src/network/networkd-network.c
@@ -363,7 +363,8 @@ int config_parse_tunnel(const char *unit,
 
         if (netdev->kind != NETDEV_KIND_IPIP &&
             netdev->kind != NETDEV_KIND_SIT &&
-            netdev->kind != NETDEV_KIND_GRE) {
+            netdev->kind != NETDEV_KIND_GRE &&
+            netdev->kind != NETDEV_KIND_VTI) {
                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
                            "NetDev is not a tunnel, ignoring assignment: %s", rvalue);
                 return 0;
diff --git a/src/network/networkd-tunnel.c b/src/network/networkd-tunnel.c
index 1a06a17c7b..e3ceb8b52b 100644
--- a/src/network/networkd-tunnel.c
+++ b/src/network/networkd-tunnel.c
@@ -339,6 +339,94 @@ static int netdev_fill_ipgre_rtnl_message(Link *link, sd_rtnl_message *m) {
         return r;
 }
 
+static int netdev_fill_vti_rtnl_message(Link *link, sd_rtnl_message *m) {
+        NetDev *netdev;
+        int r;
+
+        assert(link);
+        assert(link->network);
+        assert(link->network->tunnel);
+        assert(m);
+
+        netdev = link->network->tunnel;
+
+        r = sd_rtnl_message_append_string(m, IFLA_IFNAME, netdev->ifname);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_IFNAME, attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        if(netdev->mtu) {
+                r = sd_rtnl_message_append_u32(m, IFLA_MTU, netdev->mtu);
+                if (r < 0) {
+                        log_error_netdev(netdev,
+                                         "Could not append IFLA_MTU attribute: %s",
+                                         strerror(-r));
+                        return r;
+                }
+        }
+
+        r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_LINKINFO attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA,
+                                                 netdev_kind_to_string(netdev->kind));
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_INFO_DATA attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_append_u32(m, IFLA_VTI_LINK, link->ifindex);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_IPTUN_LINK attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_append_in_addr(m, IFLA_VTI_LOCAL, &netdev->tunnel_local);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_IPTUN_LOCAL attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_append_in_addr(m, IFLA_VTI_REMOTE, &netdev->tunnel_remote);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_IPTUN_REMOTE attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_close_container(m);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_INFO_DATA attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_close_container(m);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_LINKINFO attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        return r;
+}
 
 int netdev_create_tunnel(Link *link, sd_rtnl_message_handler_t callback) {
         _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
@@ -371,6 +459,8 @@ int netdev_create_tunnel(Link *link, sd_rtnl_message_handler_t callback) {
                         return r;
                 }
                 break;
+        case NETDEV_KIND_VTI:
+                break;
         default:
                 return -ENOTSUP;
         }
@@ -394,6 +484,11 @@ int netdev_create_tunnel(Link *link, sd_rtnl_message_handler_t callback) {
                 if(r < 0)
                         return r;
                 break;
+        case NETDEV_KIND_VTI:
+                netdev_fill_vti_rtnl_message(link, m);
+                if(r < 0)
+                        return r;
+                break;
         case NETDEV_KIND_GRE:
                 r = netdev_fill_ipgre_rtnl_message(link, m);
                 if(r < 0)
diff --git a/src/network/networkd.h b/src/network/networkd.h
index 6f69c9a487..82d8d706b5 100644
--- a/src/network/networkd.h
+++ b/src/network/networkd.h
@@ -72,6 +72,7 @@ typedef enum NetDevKind {
         NETDEV_KIND_GRE,
         NETDEV_KIND_SIT,
         NETDEV_KIND_VETH,
+        NETDEV_KIND_VTI,
         _NETDEV_KIND_MAX,
         _NETDEV_KIND_INVALID = -1
 } NetDevKind;