networkd: introduce vti6 tunnel

This patch add support to create vti6 tunnel

test:

vt6.network
[Match]
Name=wlan0

[Network]
Tunnel=ip6vti

vti6.netdev
[NetDev]
Name=ip6vti
Kind=vti6

[Tunnel]
Local=2a00:ffde:4567:edde::4987
Remote=2001:473:fece:cafe::5179

ip link

11: ip6_vti0@NONE: <NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT
group default
    link/tunnel6 :: brd ::
12: ip6vti@wlan0: <POINTOPOINT,NOARP> mtu 1500 qdisc noop state DOWN
mode DEFAULT group default
    link/tunnel6 2a00:ffde:4567:edde::4987 peer 2001:473:fece:cafe::5179

5 files changed, 49 insertions, 0 deletions

diff --git a/src/network/networkd-netdev-tunnel.c b/src/network/networkd-netdev-tunnel.c
index 7aa9317a18..aef2ef4fef 100644
--- a/src/network/networkd-netdev-tunnel.c
+++ b/src/network/networkd-netdev-tunnel.c
@@ -212,6 +212,31 @@ static int netdev_vti_fill_message_create(NetDev *netdev, Link *link, sd_rtnl_me
         return r;
 }
 
+static int netdev_vti6_fill_message_create(NetDev *netdev, Link *link, sd_rtnl_message *m) {
+        Tunnel *t = VTI6(netdev);
+        int r;
+
+        assert(netdev);
+        assert(link);
+        assert(m);
+        assert(t);
+        assert(t->family == AF_INET6);
+
+        r = sd_rtnl_message_append_u32(m, IFLA_VTI_LINK, link->ifindex);
+        if (r < 0)
+                return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_LINK attribute: %m");
+
+        r = sd_rtnl_message_append_in6_addr(m, IFLA_VTI_LOCAL, &t->local.in6);
+        if (r < 0)
+                return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_LOCAL attribute: %m");
+
+        r = sd_rtnl_message_append_in6_addr(m, IFLA_VTI_REMOTE, &t->remote.in6);
+        if (r < 0)
+                return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_REMOTE attribute: %m");
+
+        return r;
+}
+
 static int netdev_ip6tnl_fill_message_create(NetDev *netdev, Link *link, sd_rtnl_message *m) {
         Tunnel *t = IP6TNL(netdev);
         uint8_t proto;
@@ -287,6 +312,9 @@ static int netdev_tunnel_verify(NetDev *netdev, const char *filename) {
         case NETDEV_KIND_VTI:
                 t = VTI(netdev);
                 break;
+        case NETDEV_KIND_VTI6:
+                t = VTI6(netdev);
+                break;
         case NETDEV_KIND_IP6TNL:
                 t = IP6TNL(netdev);
                 break;
@@ -374,6 +402,12 @@ static void vti_init(NetDev *n) {
         Tunnel *t = VTI(n);
 
         assert(n);
+
+        if (n->kind == NETDEV_KIND_VTI)
+                t =  VTI(n);
+        else
+                t = VTI6(n);
+
         assert(t);
 
         t->pmtudisc = true;
@@ -447,6 +481,15 @@ const NetDevVTable vti_vtable = {
         .config_verify = netdev_tunnel_verify,
 };
 
+const NetDevVTable vti6_vtable = {
+        .object_size = sizeof(Tunnel),
+        .init = vti_init,
+        .sections = "Match\0NetDev\0Tunnel\0",
+        .fill_message_create = netdev_vti6_fill_message_create,
+        .create_type = NETDEV_CREATE_STACKED,
+        .config_verify = netdev_tunnel_verify,
+};
+
 const NetDevVTable gre_vtable = {
         .object_size = sizeof(Tunnel),
         .init = gre_init,
diff --git a/src/network/networkd-netdev-tunnel.h b/src/network/networkd-netdev-tunnel.h
index 453d73c596..88f57ac105 100644
--- a/src/network/networkd-netdev-tunnel.h
+++ b/src/network/networkd-netdev-tunnel.h
@@ -55,6 +55,7 @@ struct Tunnel {
 extern const NetDevVTable ipip_vtable;
 extern const NetDevVTable sit_vtable;
 extern const NetDevVTable vti_vtable;
+extern const NetDevVTable vti6_vtable;
 extern const NetDevVTable gre_vtable;
 extern const NetDevVTable gretap_vtable;
 extern const NetDevVTable ip6gre_vtable;
diff --git a/src/network/networkd-netdev.c b/src/network/networkd-netdev.c
index 78f7c4059f..66fd0fac0a 100644
--- a/src/network/networkd-netdev.c
+++ b/src/network/networkd-netdev.c
@@ -43,6 +43,7 @@ const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
         [NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable,
         [NETDEV_KIND_SIT] = &sit_vtable,
         [NETDEV_KIND_VTI] = &vti_vtable,
+        [NETDEV_KIND_VTI6] = &vti6_vtable,
         [NETDEV_KIND_VETH] = &veth_vtable,
         [NETDEV_KIND_DUMMY] = &dummy_vtable,
         [NETDEV_KIND_TUN] = &tun_vtable,
@@ -65,6 +66,7 @@ static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
         [NETDEV_KIND_SIT] = "sit",
         [NETDEV_KIND_VETH] = "veth",
         [NETDEV_KIND_VTI] = "vti",
+        [NETDEV_KIND_VTI6] = "vti6",
         [NETDEV_KIND_DUMMY] = "dummy",
         [NETDEV_KIND_TUN] = "tun",
         [NETDEV_KIND_TAP] = "tap",
diff --git a/src/network/networkd-netdev.h b/src/network/networkd-netdev.h
index ff0606715f..8382606f1c 100644
--- a/src/network/networkd-netdev.h
+++ b/src/network/networkd-netdev.h
@@ -50,6 +50,7 @@ typedef enum NetDevKind {
         NETDEV_KIND_SIT,
         NETDEV_KIND_VETH,
         NETDEV_KIND_VTI,
+        NETDEV_KIND_VTI6,
         NETDEV_KIND_IP6TNL,
         NETDEV_KIND_DUMMY,
         NETDEV_KIND_TUN,
@@ -169,6 +170,7 @@ DEFINE_CAST(IP6GRE, Tunnel);
 DEFINE_CAST(IP6GRETAP, Tunnel);
 DEFINE_CAST(SIT, Tunnel);
 DEFINE_CAST(VTI, Tunnel);
+DEFINE_CAST(VTI6, Tunnel);
 DEFINE_CAST(IP6TNL, Tunnel);
 DEFINE_CAST(VETH, Veth);
 DEFINE_CAST(DUMMY, Dummy);
diff --git a/src/network/networkd-network.c b/src/network/networkd-network.c
index 64c1b9cce1..4d4972e5d6 100644
--- a/src/network/networkd-network.c
+++ b/src/network/networkd-network.c
@@ -513,6 +513,7 @@ int config_parse_tunnel(const char *unit,
             netdev->kind != NETDEV_KIND_IP6GRE &&
             netdev->kind != NETDEV_KIND_IP6GRETAP &&
             netdev->kind != NETDEV_KIND_VTI &&
+            netdev->kind != NETDEV_KIND_VTI6 &&
             netdev->kind != NETDEV_KIND_IP6TNL
             ) {
                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,