networkd: Introduce ip6gre and ip6gretap

This patch introduces ipv6 gre and gretap.

test:

ip6gre.netdev:
[NetDev]
Name=ip6gretap
Kind=ip6gretap

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

ip6gre.network:
[Match]
Name=eno16777736

[Network]
Tunnel=ip6gretap

ip link

6: ip6gre@eno16777736: <POINTOPOINT,NOARP> mtu 1448 qdisc noop state
DOWN mode DEFAULT group default
    link/gre6 2a:00:ff:de:45:67:ed:de:00:00:00:00:00:00:49:87 peer
20:01:04:73:fe:ce:ca:fe:00:00:00:00:00:00:51:79

5 files changed, 102 insertions, 0 deletions

diff --git a/src/network/networkd-netdev-tunnel.c b/src/network/networkd-netdev-tunnel.c
index f439bf91b5..89a9096bcd 100644
--- a/src/network/networkd-netdev-tunnel.c
+++ b/src/network/networkd-netdev-tunnel.c
@@ -218,6 +218,57 @@ static int netdev_gre_fill_message_create(NetDev *netdev, Link *link, sd_rtnl_me
         return r;
 }
 
+static int netdev_ip6gre_fill_message_create(NetDev *netdev, Link *link, sd_rtnl_message *m) {
+        Tunnel *t;
+        int r;
+
+        assert(netdev);
+
+        if (netdev->kind == NETDEV_KIND_IP6GRE)
+                 t = IP6GRE(netdev);
+        else
+                 t = IP6GRETAP(netdev);
+
+        assert(t);
+        assert(t->family == AF_INET6);
+        assert(link);
+        assert(m);
+
+        r = sd_rtnl_message_append_u32(m, IFLA_GRE_LINK, link->ifindex);
+        if (r < 0) {
+                log_netdev_error(netdev,
+                                 "Could not append IFLA_GRE_LINK attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_append_in6_addr(m, IFLA_GRE_LOCAL, &t->local.in6);
+        if (r < 0) {
+                log_netdev_error(netdev,
+                                 "Could not append IFLA_GRE_LOCAL attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_append_in6_addr(m, IFLA_GRE_REMOTE, &t->remote.in6);
+        if (r < 0) {
+                log_netdev_error(netdev,
+                                 "Could not append IFLA_GRE_REMOTE attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_append_u8(m, IFLA_GRE_TTL, t->ttl);
+        if (r < 0) {
+                log_netdev_error(netdev,
+                                 "Could not append IFLA_GRE_TTL attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        return r;
+}
+
 static int netdev_vti_fill_message_create(NetDev *netdev, Link *link, sd_rtnl_message *m) {
         Tunnel *t = VTI(netdev);
         int r;
@@ -341,6 +392,12 @@ static int netdev_tunnel_verify(NetDev *netdev, const char *filename) {
         case NETDEV_KIND_GRETAP:
                 t = GRETAP(netdev);
                 break;
+        case NETDEV_KIND_IP6GRE:
+                t = IP6GRE(netdev);
+                break;
+        case NETDEV_KIND_IP6GRETAP:
+                t = IP6GRETAP(netdev);
+                break;
         case NETDEV_KIND_VTI:
                 t = VTI(netdev);
                 break;
@@ -451,6 +508,21 @@ static void gre_init(NetDev *n) {
         t->pmtudisc = true;
 }
 
+static void ip6gre_init(NetDev *n) {
+        Tunnel *t;
+
+        assert(n);
+
+        if (n->kind == NETDEV_KIND_IP6GRE)
+                t = IP6GRE(n);
+        else
+                t = IP6GRETAP(n);
+
+        assert(t);
+
+        t->ttl = DEFAULT_TNL_HOP_LIMIT;
+}
+
 static void ip6tnl_init(NetDev *n) {
         Tunnel *t = IP6TNL(n);
 
@@ -507,6 +579,24 @@ const NetDevVTable gretap_vtable = {
         .config_verify = netdev_tunnel_verify,
 };
 
+const NetDevVTable ip6gre_vtable = {
+        .object_size = sizeof(Tunnel),
+        .init = ip6gre_init,
+        .sections = "Match\0NetDev\0Tunnel\0",
+        .fill_message_create = netdev_ip6gre_fill_message_create,
+        .create_type = NETDEV_CREATE_STACKED,
+        .config_verify = netdev_tunnel_verify,
+};
+
+const NetDevVTable ip6gretap_vtable = {
+        .object_size = sizeof(Tunnel),
+        .init = ip6gre_init,
+        .sections = "Match\0NetDev\0Tunnel\0",
+        .fill_message_create = netdev_ip6gre_fill_message_create,
+        .create_type = NETDEV_CREATE_STACKED,
+        .config_verify = netdev_tunnel_verify,
+};
+
 const NetDevVTable ip6tnl_vtable = {
         .object_size = sizeof(Tunnel),
         .init = ip6tnl_init,
diff --git a/src/network/networkd-netdev-tunnel.h b/src/network/networkd-netdev-tunnel.h
index 1687f9e6ad..453d73c596 100644
--- a/src/network/networkd-netdev-tunnel.h
+++ b/src/network/networkd-netdev-tunnel.h
@@ -57,6 +57,8 @@ extern const NetDevVTable sit_vtable;
 extern const NetDevVTable vti_vtable;
 extern const NetDevVTable gre_vtable;
 extern const NetDevVTable gretap_vtable;
+extern const NetDevVTable ip6gre_vtable;
+extern const NetDevVTable ip6gretap_vtable;
 extern const NetDevVTable ip6tnl_vtable;
 
 const char *ip6tnl_mode_to_string(Ip6TnlMode d) _const_;
diff --git a/src/network/networkd-netdev.c b/src/network/networkd-netdev.c
index ed857023bc..8119205dde 100644
--- a/src/network/networkd-netdev.c
+++ b/src/network/networkd-netdev.c
@@ -40,6 +40,8 @@ const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
         [NETDEV_KIND_IPIP] = &ipip_vtable,
         [NETDEV_KIND_GRE] = &gre_vtable,
         [NETDEV_KIND_GRETAP] = &gretap_vtable,
+        [NETDEV_KIND_IP6GRE] = &ip6gre_vtable,
+        [NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable,
         [NETDEV_KIND_SIT] = &sit_vtable,
         [NETDEV_KIND_VTI] = &vti_vtable,
         [NETDEV_KIND_VETH] = &veth_vtable,
@@ -59,6 +61,8 @@ static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
         [NETDEV_KIND_IPIP] = "ipip",
         [NETDEV_KIND_GRE] = "gre",
         [NETDEV_KIND_GRETAP] = "gretap",
+        [NETDEV_KIND_IP6GRE] = "ip6gre",
+        [NETDEV_KIND_IP6GRETAP] = "ip6gretap",
         [NETDEV_KIND_SIT] = "sit",
         [NETDEV_KIND_VETH] = "veth",
         [NETDEV_KIND_VTI] = "vti",
diff --git a/src/network/networkd-netdev.h b/src/network/networkd-netdev.h
index 77d00d4a3b..3756b1e5a7 100644
--- a/src/network/networkd-netdev.h
+++ b/src/network/networkd-netdev.h
@@ -48,6 +48,8 @@ typedef enum NetDevKind {
         NETDEV_KIND_IPIP,
         NETDEV_KIND_GRE,
         NETDEV_KIND_GRETAP,
+        NETDEV_KIND_IP6GRE,
+        NETDEV_KIND_IP6GRETAP,
         NETDEV_KIND_SIT,
         NETDEV_KIND_VETH,
         NETDEV_KIND_VTI,
@@ -166,6 +168,8 @@ DEFINE_CAST(VXLAN, VxLan);
 DEFINE_CAST(IPIP, Tunnel);
 DEFINE_CAST(GRE, Tunnel);
 DEFINE_CAST(GRETAP, Tunnel);
+DEFINE_CAST(IP6GRE, Tunnel);
+DEFINE_CAST(IP6GRETAP, Tunnel);
 DEFINE_CAST(SIT, Tunnel);
 DEFINE_CAST(VTI, Tunnel);
 DEFINE_CAST(IP6TNL, Tunnel);
diff --git a/src/network/networkd-network.c b/src/network/networkd-network.c
index 0f474d932d..4589162944 100644
--- a/src/network/networkd-network.c
+++ b/src/network/networkd-network.c
@@ -453,6 +453,8 @@ int config_parse_tunnel(const char *unit,
             netdev->kind != NETDEV_KIND_SIT &&
             netdev->kind != NETDEV_KIND_GRE &&
             netdev->kind != NETDEV_KIND_GRETAP &&
+            netdev->kind != NETDEV_KIND_IP6GRE &&
+            netdev->kind != NETDEV_KIND_IP6GRETAP &&
             netdev->kind != NETDEV_KIND_VTI &&
             netdev->kind != NETDEV_KIND_IP6TNL
             ) {