Creates GRE devices using rtnetlink and tunnel metadata.
Co-Authored-by: Thadeu Lima de Souza Cascardo <casca...@redhat.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <casca...@redhat.com>
Signed-off-by: Eric Garver <e...@erig.me>
---
lib/dpif-netlink-rtnl.c | 109 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 109 insertions(+)
diff --git a/lib/dpif-netlink-rtnl.c b/lib/dpif-netlink-rtnl.c
index c07d7df8d13a..912dc5d115b7 100644
--- a/lib/dpif-netlink-rtnl.c
+++ b/lib/dpif-netlink-rtnl.c
@@ -40,6 +40,13 @@
#define IFLA_VXLAN_COLLECT_METADATA 25
#endif
+#ifndef IFLA_GRE_MAX
+#define IFLA_GRE_MAX 0
+#endif
+#if IFLA_GRE_MAX < 18
+#define IFLA_GRE_COLLECT_METADATA 18
+#endif
+
static const struct nl_policy rtlink_policy[] = {
[IFLA_LINKINFO] = { .type = NL_A_NESTED },
};
@@ -73,6 +80,12 @@ dpif_netlink_rtnl_vxlan_destroy(const char *name)
}
static int
+dpif_netlink_rtnl_gre_destroy(const char *name)
+{
+ return dpif_netlink_rtnl_destroy(name);
+}
+
+static int
dpif_netlink_rtnl_vxlan_verify(struct netdev *netdev, const char *name,
const char *kind)
{
@@ -191,6 +204,100 @@ dpif_netlink_rtnl_vxlan_create(struct netdev *netdev)
return dpif_netlink_rtnl_vxlan_create_kind(netdev, "vxlan");
}
+static int
+dpif_netlink_rtnl_gre_verify(struct netdev *netdev OVS_UNUSED,
+ const char *name, const char *kind)
+{
+ int err;
+ struct ofpbuf request, *reply;
+ struct ifinfomsg *ifmsg;
+
+ static const struct nl_policy gre_policy[] = {
+ [IFLA_GRE_COLLECT_METADATA] = { .type = NL_A_FLAG },
+ };
+
+ ofpbuf_init(&request, 0);
+ nl_msg_put_nlmsghdr(&request, 0, RTM_GETLINK, NLM_F_REQUEST);
+ ofpbuf_put_zeros(&request, sizeof(struct ifinfomsg));
+ nl_msg_put_string(&request, IFLA_IFNAME, name);
+
+ err = nl_transact(NETLINK_ROUTE, &request, &reply);
+ ofpbuf_uninit(&request);
+
+ if (!err) {
+ struct nlattr *rtlink[ARRAY_SIZE(rtlink_policy)];
+ struct nlattr *linkinfo[ARRAY_SIZE(linkinfo_policy)];
+ struct nlattr *gre[ARRAY_SIZE(gre_policy)];
+
+ ifmsg = ofpbuf_at(reply, NLMSG_HDRLEN, sizeof *ifmsg);
+ if (!nl_policy_parse(reply, NLMSG_HDRLEN + sizeof *ifmsg,
+ rtlink_policy, rtlink, ARRAY_SIZE(rtlink_policy))
+ || !nl_parse_nested(rtlink[IFLA_LINKINFO], linkinfo_policy,
+ linkinfo, ARRAY_SIZE(linkinfo_policy))
+ || strcmp(nl_attr_get_string(linkinfo[IFLA_INFO_KIND]), kind)
+ || !nl_parse_nested(linkinfo[IFLA_INFO_DATA], gre_policy, gre,
+ ARRAY_SIZE(gre_policy))) {
+ err = EINVAL;
+ }
+ if (!err) {
+ if (!nl_attr_get_flag(gre[IFLA_GRE_COLLECT_METADATA])) {
+ err = EINVAL;
+ }
+ }
+ ofpbuf_delete(reply);
+ }
+
+ return err;
+}
+
+static int
+dpif_netlink_rtnl_gre_create_kind(struct netdev *netdev, const char *kind)
+{
+ int err;
+ struct ofpbuf request;
+ size_t linkinfo_off, infodata_off;
+ char namebuf[NETDEV_VPORT_NAME_BUFSIZE];
+ const char *name = netdev_vport_get_dpif_port(netdev,
+ namebuf, sizeof namebuf);
+ struct ifinfomsg *ifinfo;
+ const struct netdev_tunnel_config *tnl_cfg;
+ tnl_cfg = netdev_get_tunnel_config(netdev);
+ if (!tnl_cfg) {
+ return EINVAL;
+ }
+
+ ofpbuf_init(&request, 0);
+ nl_msg_put_nlmsghdr(&request, 0, RTM_NEWLINK,
+ NLM_F_REQUEST | NLM_F_ACK | NLM_F_CREATE);
+ ifinfo = ofpbuf_put_zeros(&request, sizeof(struct ifinfomsg));
+ ifinfo->ifi_change = ifinfo->ifi_flags = IFF_UP;
+ nl_msg_put_string(&request, IFLA_IFNAME, name);
+ nl_msg_put_u32(&request, IFLA_MTU, UINT16_MAX);
+ linkinfo_off = nl_msg_start_nested(&request, IFLA_LINKINFO);
+ nl_msg_put_string(&request, IFLA_INFO_KIND, kind);
+ infodata_off = nl_msg_start_nested(&request, IFLA_INFO_DATA);
+
+ nl_msg_put_flag(&request, IFLA_GRE_COLLECT_METADATA);
+
+ nl_msg_end_nested(&request, infodata_off);
+ nl_msg_end_nested(&request, linkinfo_off);
+
+ err = nl_transact(NETLINK_ROUTE, &request, NULL);
+ ofpbuf_uninit(&request);
+
+ if (!err && (err = dpif_netlink_rtnl_gre_verify(netdev, name, kind))) {
+ dpif_netlink_rtnl_gre_destroy(name);
+ }
+
+ return err;
+}
+
+static int
+dpif_netlink_rtnl_gre_create(struct netdev *netdev)
+{
+ return dpif_netlink_rtnl_gre_create_kind(netdev, "gretap");
+}
+
int
dpif_netlink_rtnl_port_create(struct netdev *netdev)
{
@@ -198,6 +305,7 @@ dpif_netlink_rtnl_port_create(struct netdev *netdev)
case OVS_VPORT_TYPE_VXLAN:
return dpif_netlink_rtnl_vxlan_create(netdev);
case OVS_VPORT_TYPE_GRE:
+ return dpif_netlink_rtnl_gre_create(netdev);
case OVS_VPORT_TYPE_GENEVE:
case OVS_VPORT_TYPE_NETDEV:
case OVS_VPORT_TYPE_INTERNAL:
@@ -218,6 +326,7 @@ dpif_netlink_rtnl_port_destroy(const char *name, const char
*type)
case OVS_VPORT_TYPE_VXLAN:
return dpif_netlink_rtnl_vxlan_destroy(name);
case OVS_VPORT_TYPE_GRE:
+ return dpif_netlink_rtnl_gre_destroy(name);
case OVS_VPORT_TYPE_GENEVE:
case OVS_VPORT_TYPE_NETDEV:
case OVS_VPORT_TYPE_INTERNAL:
--
2.10.0
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