/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2015 Red Hat, Inc.
 */

#include "src/core/nm-default-daemon.h"

#include "nm-device-ip-tunnel.h"

#include <netinet/in.h>
#include <linux/if.h>
#include <linux/ip.h>
#include <linux/if_tunnel.h>
#include <linux/ip6_tunnel.h>
#include <linux/if_ether.h>

#include "nm-device-private.h"
#include "nm-manager.h"
#include "libnm-platform/nm-platform.h"
#include "nm-device-factory.h"
#include "libnm-core-intern/nm-core-internal.h"
#include "settings/nm-settings.h"
#include "nm-act-request.h"
#include "nm-ip4-config.h"

#define _NMLOG_DEVICE_TYPE NMDeviceIPTunnel
#include "nm-device-logging.h"

/*****************************************************************************/

NM_GOBJECT_PROPERTIES_DEFINE(NMDeviceIPTunnel,
                             PROP_MODE,
                             PROP_LOCAL,
                             PROP_REMOTE,
                             PROP_TTL,
                             PROP_TOS,
                             PROP_PATH_MTU_DISCOVERY,
                             PROP_INPUT_KEY,
                             PROP_OUTPUT_KEY,
                             PROP_ENCAPSULATION_LIMIT,
                             PROP_FLOW_LABEL,
                             PROP_FLAGS, );

typedef struct {
    NMIPTunnelMode  mode;
    char *          local;
    char *          remote;
    guint8          ttl;
    guint8          tos;
    gboolean        path_mtu_discovery;
    int             addr_family;
    char *          input_key;
    char *          output_key;
    guint8          encap_limit;
    guint32         flow_label;
    NMIPTunnelFlags flags;
} NMDeviceIPTunnelPrivate;

struct _NMDeviceIPTunnel {
    NMDevice                parent;
    NMDeviceIPTunnelPrivate _priv;
};

struct _NMDeviceIPTunnelClass {
    NMDeviceClass parent;
};

G_DEFINE_TYPE(NMDeviceIPTunnel, nm_device_ip_tunnel, NM_TYPE_DEVICE)

#define NM_DEVICE_IP_TUNNEL_GET_PRIVATE(self) \
    _NM_GET_PRIVATE(self, NMDeviceIPTunnel, NM_IS_DEVICE_IP_TUNNEL, NMDevice)

/*****************************************************************************/

static guint32
ip6tnl_flags_setting_to_plat(NMIPTunnelFlags flags)
{
    G_STATIC_ASSERT(NM_IP_TUNNEL_FLAG_IP6_IGN_ENCAP_LIMIT == IP6_TNL_F_IGN_ENCAP_LIMIT);
    G_STATIC_ASSERT(NM_IP_TUNNEL_FLAG_IP6_USE_ORIG_TCLASS == IP6_TNL_F_USE_ORIG_TCLASS);
    G_STATIC_ASSERT(NM_IP_TUNNEL_FLAG_IP6_USE_ORIG_FLOWLABEL == IP6_TNL_F_USE_ORIG_FLOWLABEL);
    G_STATIC_ASSERT(NM_IP_TUNNEL_FLAG_IP6_MIP6_DEV == IP6_TNL_F_MIP6_DEV);
    G_STATIC_ASSERT(NM_IP_TUNNEL_FLAG_IP6_RCV_DSCP_COPY == IP6_TNL_F_RCV_DSCP_COPY);
    G_STATIC_ASSERT(NM_IP_TUNNEL_FLAG_IP6_USE_ORIG_FWMARK == IP6_TNL_F_USE_ORIG_FWMARK);

    /* NOTE: "accidentally", the numeric values correspond.
     *       For flags added in the future, that might no longer
     *       be the case. */
    return flags & _NM_IP_TUNNEL_FLAG_ALL_IP6TNL;
}

static NMIPTunnelFlags
ip6tnl_flags_plat_to_setting(guint32 flags)
{
    return flags & ((guint32) _NM_IP_TUNNEL_FLAG_ALL_IP6TNL);
}

/*****************************************************************************/

static gboolean
address_equal_pp(int addr_family, const char *a, const char *b)
{
    const NMIPAddr *addr_a = &nm_ip_addr_zero;
    const NMIPAddr *addr_b = &nm_ip_addr_zero;
    NMIPAddr        addr_a_val;
    NMIPAddr        addr_b_val;

    nm_assert_addr_family(addr_family);

    if (a) {
        if (!nm_utils_parse_inaddr_bin(addr_family, a, NULL, &addr_a_val))
            nm_assert_not_reached();
        addr_a = &addr_a_val;
    }
    if (b) {
        if (!nm_utils_parse_inaddr_bin(addr_family, b, NULL, &addr_b_val))
            nm_assert_not_reached();
        addr_b = &addr_b_val;
    }

    return nm_ip_addr_equal(addr_family, addr_a, addr_b);
}

static gboolean
address_set(int addr_family, char **p_addr, const NMIPAddr *addr_new)
{
    nm_assert_addr_family(addr_family);
    nm_assert(p_addr);
    nm_assert(!*p_addr || nm_utils_ipaddr_is_normalized(addr_family, *p_addr));

    if (!addr_new || nm_ip_addr_is_null(addr_family, addr_new)) {
        if (nm_clear_g_free(p_addr))
            return TRUE;
        return FALSE;
    }

    if (*p_addr) {
        NMIPAddr addr_val;

        if (!nm_utils_parse_inaddr_bin(addr_family, *p_addr, NULL, &addr_val))
            nm_assert_not_reached();

        if (nm_ip_addr_equal(addr_family, &addr_val, addr_new))
            return FALSE;

        g_free(*p_addr);
    }

    *p_addr = nm_utils_inet_ntop_dup(addr_family, addr_new);
    return TRUE;
}

static void
update_properties_from_ifindex(NMDevice *device, int ifindex)
{
    NMDeviceIPTunnel *       self           = NM_DEVICE_IP_TUNNEL(device);
    NMDeviceIPTunnelPrivate *priv           = NM_DEVICE_IP_TUNNEL_GET_PRIVATE(self);
    int                      parent_ifindex = 0;
    NMIPAddr                 local          = NM_IP_ADDR_INIT;
    NMIPAddr                 remote         = NM_IP_ADDR_INIT;
    guint8                   ttl            = 0;
    guint8                   tos            = 0;
    guint8                   encap_limit    = 0;
    gboolean                 pmtud          = FALSE;
    guint32                  flow_label     = 0;
    NMIPTunnelFlags          flags          = NM_IP_TUNNEL_FLAG_NONE;
    char *                   key;

    if (ifindex <= 0) {
clear:
        nm_device_parent_set_ifindex(device, 0);
        if (priv->local) {
            nm_clear_g_free(&priv->local);
            _notify(self, PROP_LOCAL);
        }
        if (priv->remote) {
            nm_clear_g_free(&priv->remote);
            _notify(self, PROP_REMOTE);
        }
        if (priv->input_key) {
            nm_clear_g_free(&priv->input_key);
            _notify(self, PROP_INPUT_KEY);
        }
        if (priv->output_key) {
            nm_clear_g_free(&priv->output_key);
            _notify(self, PROP_OUTPUT_KEY);
        }

        goto out;
    }

    if (NM_IN_SET(priv->mode, NM_IP_TUNNEL_MODE_GRE, NM_IP_TUNNEL_MODE_GRETAP)) {
        const NMPlatformLnkGre *lnk;

        if (priv->mode == NM_IP_TUNNEL_MODE_GRE)
            lnk = nm_platform_link_get_lnk_gre(nm_device_get_platform(device), ifindex, NULL);
        else
            lnk = nm_platform_link_get_lnk_gretap(nm_device_get_platform(device), ifindex, NULL);
        if (!lnk) {
            _LOGW(LOGD_PLATFORM, "could not read %s properties", "gre");
            goto clear;
        }

        parent_ifindex = lnk->parent_ifindex;
        local.addr4    = lnk->local;
        remote.addr4   = lnk->remote;
        ttl            = lnk->ttl;
        tos            = lnk->tos;
        pmtud          = lnk->path_mtu_discovery;

        if (NM_FLAGS_HAS(lnk->input_flags, NM_GRE_KEY)) {
            key = g_strdup_printf("%u", lnk->input_key);
            if (g_strcmp0(priv->input_key, key)) {
                g_free(priv->input_key);
                priv->input_key = key;
                _notify(self, PROP_INPUT_KEY);
            } else
                g_free(key);
        } else {
            if (priv->input_key) {
                nm_clear_g_free(&priv->input_key);
                _notify(self, PROP_INPUT_KEY);
            }
        }

        if (NM_FLAGS_HAS(lnk->output_flags, NM_GRE_KEY)) {
            key = g_strdup_printf("%u", lnk->output_key);
            if (g_strcmp0(priv->output_key, key)) {
                g_free(priv->output_key);
                priv->output_key = key;
                _notify(self, PROP_OUTPUT_KEY);
            } else
                g_free(key);
        } else {
            if (priv->output_key) {
                nm_clear_g_free(&priv->output_key);
                _notify(self, PROP_OUTPUT_KEY);
            }
        }
    } else if (priv->mode == NM_IP_TUNNEL_MODE_SIT) {
        const NMPlatformLnkSit *lnk;

        lnk = nm_platform_link_get_lnk_sit(nm_device_get_platform(device), ifindex, NULL);
        if (!lnk) {
            _LOGW(LOGD_PLATFORM, "could not read %s properties", "sit");
            goto clear;
        }

        parent_ifindex = lnk->parent_ifindex;
        local.addr4    = lnk->local;
        remote.addr4   = lnk->remote;
        ttl            = lnk->ttl;
        tos            = lnk->tos;
        pmtud          = lnk->path_mtu_discovery;
    } else if (priv->mode == NM_IP_TUNNEL_MODE_IPIP) {
        const NMPlatformLnkIpIp *lnk;

        lnk = nm_platform_link_get_lnk_ipip(nm_device_get_platform(device), ifindex, NULL);
        if (!lnk) {
            _LOGW(LOGD_PLATFORM, "could not read %s properties", "ipip");
            goto clear;
        }

        parent_ifindex = lnk->parent_ifindex;
        local.addr4    = lnk->local;
        remote.addr4   = lnk->remote;
        ttl            = lnk->ttl;
        tos            = lnk->tos;
        pmtud          = lnk->path_mtu_discovery;
    } else if (NM_IN_SET(priv->mode,
                         NM_IP_TUNNEL_MODE_IPIP6,
                         NM_IP_TUNNEL_MODE_IP6IP6,
                         NM_IP_TUNNEL_MODE_IP6GRE,
                         NM_IP_TUNNEL_MODE_IP6GRETAP)) {
        const NMPlatformLnkIp6Tnl *lnk;
        NMPlatform *               plat = nm_device_get_platform(device);

        if (priv->mode == NM_IP_TUNNEL_MODE_IP6GRE)
            lnk = nm_platform_link_get_lnk_ip6gre(plat, ifindex, NULL);
        else if (priv->mode == NM_IP_TUNNEL_MODE_IP6GRETAP)
            lnk = nm_platform_link_get_lnk_ip6gretap(plat, ifindex, NULL);
        else
            lnk = nm_platform_link_get_lnk_ip6tnl(plat, ifindex, NULL);

        if (!lnk) {
            _LOGW(LOGD_PLATFORM, "could not read %s properties", "ip6tnl");
            goto clear;
        }

        parent_ifindex = lnk->parent_ifindex;
        local.addr6    = lnk->local;
        remote.addr6   = lnk->remote;
        ttl            = lnk->ttl;
        tos            = lnk->tclass;
        encap_limit    = lnk->encap_limit;
        flow_label     = lnk->flow_label;
        flags          = ip6tnl_flags_plat_to_setting(lnk->flags);

        if (NM_IN_SET(priv->mode, NM_IP_TUNNEL_MODE_IP6GRE, NM_IP_TUNNEL_MODE_IP6GRETAP)) {
            if (NM_FLAGS_HAS(lnk->input_flags, NM_GRE_KEY)) {
                key = g_strdup_printf("%u", lnk->input_key);
                if (g_strcmp0(priv->input_key, key)) {
                    g_free(priv->input_key);
                    priv->input_key = key;
                    _notify(self, PROP_INPUT_KEY);
                } else
                    g_free(key);
            } else {
                if (priv->input_key) {
                    nm_clear_g_free(&priv->input_key);
                    _notify(self, PROP_INPUT_KEY);
                }
            }

            if (NM_FLAGS_HAS(lnk->output_flags, NM_GRE_KEY)) {
                key = g_strdup_printf("%u", lnk->output_key);
                if (g_strcmp0(priv->output_key, key)) {
                    g_free(priv->output_key);
                    priv->output_key = key;
                    _notify(self, PROP_OUTPUT_KEY);
                } else
                    g_free(key);
            } else {
                if (priv->output_key) {
                    nm_clear_g_free(&priv->output_key);
                    _notify(self, PROP_OUTPUT_KEY);
                }
            }
        }
    } else
        g_return_if_reached();

    nm_device_parent_set_ifindex(device, parent_ifindex);

    if (address_set(priv->addr_family, &priv->local, &local))
        _notify(self, PROP_LOCAL);
    if (address_set(priv->addr_family, &priv->remote, &remote))
        _notify(self, PROP_REMOTE);

out:

    if (priv->ttl != ttl) {
        priv->ttl = ttl;
        _notify(self, PROP_TTL);
    }

    if (priv->tos != tos) {
        priv->tos = tos;
        _notify(self, PROP_TOS);
    }

    if (priv->path_mtu_discovery != pmtud) {
        priv->path_mtu_discovery = pmtud;
        _notify(self, PROP_PATH_MTU_DISCOVERY);
    }

    if (priv->encap_limit != encap_limit) {
        priv->encap_limit = encap_limit;
        _notify(self, PROP_ENCAPSULATION_LIMIT);
    }

    if (priv->flow_label != flow_label) {
        priv->flow_label = flow_label;
        _notify(self, PROP_FLOW_LABEL);
    }

    if (priv->flags != flags) {
        priv->flags = flags;
        _notify(self, PROP_FLAGS);
    }
}

static void
update_properties(NMDevice *device)
{
    update_properties_from_ifindex(device, nm_device_get_ifindex(device));
}

static void
link_changed(NMDevice *device, const NMPlatformLink *pllink)
{
    NM_DEVICE_CLASS(nm_device_ip_tunnel_parent_class)->link_changed(device, pllink);
    update_properties(device);
}

static gboolean
complete_connection(NMDevice *           device,
                    NMConnection *       connection,
                    const char *         specific_object,
                    NMConnection *const *existing_connections,
                    GError **            error)
{
    NMSettingIPTunnel *s_ip_tunnel;

    nm_utils_complete_generic(nm_device_get_platform(device),
                              connection,
                              NM_SETTING_IP_TUNNEL_SETTING_NAME,
                              existing_connections,
                              NULL,
                              _("IP tunnel connection"),
                              NULL,
                              NULL,
                              TRUE);

    s_ip_tunnel = nm_connection_get_setting_ip_tunnel(connection);
    if (!s_ip_tunnel) {
        g_set_error_literal(error,
                            NM_DEVICE_ERROR,
                            NM_DEVICE_ERROR_INVALID_CONNECTION,
                            "A 'tunnel' setting is required.");
        return FALSE;
    }

    return TRUE;
}

static void
update_connection(NMDevice *device, NMConnection *connection)
{
    NMDeviceIPTunnel *       self        = NM_DEVICE_IP_TUNNEL(device);
    NMDeviceIPTunnelPrivate *priv        = NM_DEVICE_IP_TUNNEL_GET_PRIVATE(self);
    NMSettingIPTunnel *      s_ip_tunnel = nm_connection_get_setting_ip_tunnel(connection);

    if (!s_ip_tunnel) {
        s_ip_tunnel = (NMSettingIPTunnel *) nm_setting_ip_tunnel_new();
        nm_connection_add_setting(connection, (NMSetting *) s_ip_tunnel);
    }

    if (nm_setting_ip_tunnel_get_mode(s_ip_tunnel) != priv->mode)
        g_object_set(G_OBJECT(s_ip_tunnel), NM_SETTING_IP_TUNNEL_MODE, priv->mode, NULL);

    g_object_set(
        s_ip_tunnel,
        NM_SETTING_IP_TUNNEL_PARENT,
        nm_device_parent_find_for_connection(device, nm_setting_ip_tunnel_get_parent(s_ip_tunnel)),
        NULL);

    if (!address_equal_pp(priv->addr_family,
                          nm_setting_ip_tunnel_get_local(s_ip_tunnel),
                          priv->local))
        g_object_set(G_OBJECT(s_ip_tunnel), NM_SETTING_IP_TUNNEL_LOCAL, priv->local, NULL);

    if (!address_equal_pp(priv->addr_family,
                          nm_setting_ip_tunnel_get_remote(s_ip_tunnel),
                          priv->remote))
        g_object_set(G_OBJECT(s_ip_tunnel), NM_SETTING_IP_TUNNEL_REMOTE, priv->remote, NULL);

    if (nm_setting_ip_tunnel_get_ttl(s_ip_tunnel) != priv->ttl)
        g_object_set(G_OBJECT(s_ip_tunnel), NM_SETTING_IP_TUNNEL_TTL, priv->ttl, NULL);

    if (nm_setting_ip_tunnel_get_tos(s_ip_tunnel) != priv->tos)
        g_object_set(G_OBJECT(s_ip_tunnel), NM_SETTING_IP_TUNNEL_TOS, priv->tos, NULL);

    if (nm_setting_ip_tunnel_get_path_mtu_discovery(s_ip_tunnel) != priv->path_mtu_discovery) {
        g_object_set(G_OBJECT(s_ip_tunnel),
                     NM_SETTING_IP_TUNNEL_PATH_MTU_DISCOVERY,
                     priv->path_mtu_discovery,
                     NULL);
    }

    if (nm_setting_ip_tunnel_get_encapsulation_limit(s_ip_tunnel) != priv->encap_limit) {
        g_object_set(G_OBJECT(s_ip_tunnel),
                     NM_SETTING_IP_TUNNEL_ENCAPSULATION_LIMIT,
                     priv->encap_limit,
                     NULL);
    }

    if (nm_setting_ip_tunnel_get_flow_label(s_ip_tunnel) != priv->flow_label) {
        g_object_set(G_OBJECT(s_ip_tunnel),
                     NM_SETTING_IP_TUNNEL_FLOW_LABEL,
                     priv->flow_label,
                     NULL);
    }

    if (NM_IN_SET(priv->mode,
                  NM_IP_TUNNEL_MODE_GRE,
                  NM_IP_TUNNEL_MODE_GRETAP,
                  NM_IP_TUNNEL_MODE_IP6GRE,
                  NM_IP_TUNNEL_MODE_IP6GRETAP)) {
        if (g_strcmp0(nm_setting_ip_tunnel_get_input_key(s_ip_tunnel), priv->input_key)) {
            g_object_set(G_OBJECT(s_ip_tunnel),
                         NM_SETTING_IP_TUNNEL_INPUT_KEY,
                         priv->input_key,
                         NULL);
        }
        if (g_strcmp0(nm_setting_ip_tunnel_get_output_key(s_ip_tunnel), priv->output_key)) {
            g_object_set(G_OBJECT(s_ip_tunnel),
                         NM_SETTING_IP_TUNNEL_OUTPUT_KEY,
                         priv->output_key,
                         NULL);
        }
    }
}

static gboolean
check_connection_compatible(NMDevice *device, NMConnection *connection, GError **error)
{
    NMDeviceIPTunnel *       self = NM_DEVICE_IP_TUNNEL(device);
    NMDeviceIPTunnelPrivate *priv = NM_DEVICE_IP_TUNNEL_GET_PRIVATE(self);
    NMSettingIPTunnel *      s_ip_tunnel;
    const char *             parent;

    if (!NM_DEVICE_CLASS(nm_device_ip_tunnel_parent_class)
             ->check_connection_compatible(device, connection, error))
        return FALSE;

    s_ip_tunnel = nm_connection_get_setting_ip_tunnel(connection);

    if (nm_setting_ip_tunnel_get_mode(s_ip_tunnel) != priv->mode) {
        nm_utils_error_set_literal(error,
                                   NM_UTILS_ERROR_CONNECTION_AVAILABLE_TEMPORARY,
                                   "incompatible IP tunnel mode");
        return FALSE;
    }

    if (nm_device_is_real(device)) {
        /* Check parent interface; could be an interface name or a UUID */
        parent = nm_setting_ip_tunnel_get_parent(s_ip_tunnel);
        if (parent && !nm_device_match_parent(device, parent)) {
            nm_utils_error_set_literal(error,
                                       NM_UTILS_ERROR_CONNECTION_AVAILABLE_TEMPORARY,
                                       "IP tunnel parent mismatches");
            return FALSE;
        }

        if (!address_equal_pp(priv->addr_family,
                              nm_setting_ip_tunnel_get_local(s_ip_tunnel),
                              priv->local)) {
            nm_utils_error_set_literal(error,
                                       NM_UTILS_ERROR_CONNECTION_AVAILABLE_TEMPORARY,
                                       "local IP tunnel address mismatches");
            return FALSE;
        }

        if (!address_equal_pp(priv->addr_family,
                              nm_setting_ip_tunnel_get_remote(s_ip_tunnel),
                              priv->remote)) {
            nm_utils_error_set_literal(error,
                                       NM_UTILS_ERROR_CONNECTION_AVAILABLE_TEMPORARY,
                                       "remote IP tunnel address mismatches");
            return FALSE;
        }

        if (nm_setting_ip_tunnel_get_ttl(s_ip_tunnel) != priv->ttl) {
            nm_utils_error_set_literal(error,
                                       NM_UTILS_ERROR_CONNECTION_AVAILABLE_TEMPORARY,
                                       "TTL of IP tunnel mismatches");
            return FALSE;
        }

        if (nm_setting_ip_tunnel_get_tos(s_ip_tunnel) != priv->tos) {
            nm_utils_error_set_literal(error,
                                       NM_UTILS_ERROR_CONNECTION_AVAILABLE_TEMPORARY,
                                       "TOS of IP tunnel mismatches");
            return FALSE;
        }

        if (priv->addr_family == AF_INET) {
            if (nm_setting_ip_tunnel_get_path_mtu_discovery(s_ip_tunnel)
                != priv->path_mtu_discovery) {
                nm_utils_error_set_literal(error,
                                           NM_UTILS_ERROR_CONNECTION_AVAILABLE_TEMPORARY,
                                           "MTU discovery setting of IP tunnel mismatches");
                return FALSE;
            }
        } else {
            if (nm_setting_ip_tunnel_get_encapsulation_limit(s_ip_tunnel) != priv->encap_limit) {
                nm_utils_error_set_literal(error,
                                           NM_UTILS_ERROR_CONNECTION_AVAILABLE_TEMPORARY,
                                           "encapsulation limit of IP tunnel mismatches");
                return FALSE;
            }

            if (nm_setting_ip_tunnel_get_flow_label(s_ip_tunnel) != priv->flow_label) {
                nm_utils_error_set_literal(error,
                                           NM_UTILS_ERROR_CONNECTION_AVAILABLE_TEMPORARY,
                                           "flow-label of IP tunnel mismatches");
                return FALSE;
            }
        }
    }

    return TRUE;
}

static NMIPTunnelMode
platform_link_to_tunnel_mode(const NMPlatformLink *link)
{
    const NMPlatformLnkIp6Tnl *lnk;

    switch (link->type) {
    case NM_LINK_TYPE_GRE:
        return NM_IP_TUNNEL_MODE_GRE;
    case NM_LINK_TYPE_GRETAP:
        return NM_IP_TUNNEL_MODE_GRETAP;
    case NM_LINK_TYPE_IP6TNL:
        lnk = nm_platform_link_get_lnk_ip6tnl(NM_PLATFORM_GET, link->ifindex, NULL);
        if (lnk) {
            if (lnk->proto == IPPROTO_IPIP)
                return NM_IP_TUNNEL_MODE_IPIP6;
            if (lnk->proto == IPPROTO_IPV6)
                return NM_IP_TUNNEL_MODE_IP6IP6;
        }
        return NM_IP_TUNNEL_MODE_UNKNOWN;
    case NM_LINK_TYPE_IP6GRE:
        return NM_IP_TUNNEL_MODE_IP6GRE;
    case NM_LINK_TYPE_IP6GRETAP:
        return NM_IP_TUNNEL_MODE_IP6GRETAP;
    case NM_LINK_TYPE_IPIP:
        return NM_IP_TUNNEL_MODE_IPIP;
    case NM_LINK_TYPE_SIT:
        return NM_IP_TUNNEL_MODE_SIT;
    default:
        g_return_val_if_reached(NM_IP_TUNNEL_MODE_UNKNOWN);
    }
}

static NMLinkType
tunnel_mode_to_link_type(NMIPTunnelMode tunnel_mode)
{
    switch (tunnel_mode) {
    case NM_IP_TUNNEL_MODE_GRE:
        return NM_LINK_TYPE_GRE;
    case NM_IP_TUNNEL_MODE_GRETAP:
        return NM_LINK_TYPE_GRETAP;
    case NM_IP_TUNNEL_MODE_IPIP6:
    case NM_IP_TUNNEL_MODE_IP6IP6:
        return NM_LINK_TYPE_IP6TNL;
    case NM_IP_TUNNEL_MODE_IP6GRE:
        return NM_LINK_TYPE_IP6GRE;
    case NM_IP_TUNNEL_MODE_IP6GRETAP:
        return NM_LINK_TYPE_IP6GRETAP;
    case NM_IP_TUNNEL_MODE_IPIP:
        return NM_LINK_TYPE_IPIP;
    case NM_IP_TUNNEL_MODE_SIT:
        return NM_LINK_TYPE_SIT;
    case NM_IP_TUNNEL_MODE_VTI:
    case NM_IP_TUNNEL_MODE_VTI6:
    case NM_IP_TUNNEL_MODE_ISATAP:
        return NM_LINK_TYPE_UNKNOWN;
    case NM_IP_TUNNEL_MODE_UNKNOWN:
        break;
    }
    g_return_val_if_reached(NM_LINK_TYPE_UNKNOWN);
}

/*****************************************************************************/

static gboolean
create_and_realize(NMDevice *             device,
                   NMConnection *         connection,
                   NMDevice *             parent,
                   const NMPlatformLink **out_plink,
                   GError **              error)
{
    const char *        iface = nm_device_get_iface(device);
    NMSettingIPTunnel * s_ip_tunnel;
    NMPlatformLnkGre    lnk_gre    = {};
    NMPlatformLnkSit    lnk_sit    = {};
    NMPlatformLnkIpIp   lnk_ipip   = {};
    NMPlatformLnkIp6Tnl lnk_ip6tnl = {};
    const char *        str;
    gint64              val;
    NMIPTunnelMode      mode;
    int                 r;
    gs_free char *      hwaddr = NULL;
    guint8              mac_address[ETH_ALEN];
    gboolean            mac_address_valid = FALSE;

    s_ip_tunnel = nm_connection_get_setting_ip_tunnel(connection);
    nm_assert(NM_IS_SETTING_IP_TUNNEL(s_ip_tunnel));

    mode = nm_setting_ip_tunnel_get_mode(s_ip_tunnel);

    if (_nm_ip_tunnel_mode_is_layer2(mode)
        && nm_device_hw_addr_get_cloned(device, connection, FALSE, &hwaddr, NULL, NULL) && hwaddr) {
        /* FIXME: we set the MAC address when creating the interface, while the
         * NMDevice is still unrealized. As we afterwards realize the device, it
         * forgets the parameters for the cloned MAC address, and in stage 1
         * it might create a different MAC address. That should be fixed by
         * better handling device realization. */
        if (!nm_utils_hwaddr_aton(hwaddr, mac_address, ETH_ALEN)) {
            g_set_error(error,
                        NM_DEVICE_ERROR,
                        NM_DEVICE_ERROR_FAILED,
                        "Invalid hardware address '%s'",
                        hwaddr);
            g_return_val_if_reached(FALSE);
        }

        mac_address_valid = TRUE;
    }

    switch (mode) {
    case NM_IP_TUNNEL_MODE_GRETAP:
        lnk_gre.is_tap = TRUE;
        /* fall-through */
    case NM_IP_TUNNEL_MODE_GRE:
        if (parent)
            lnk_gre.parent_ifindex = nm_device_get_ifindex(parent);

        str = nm_setting_ip_tunnel_get_local(s_ip_tunnel);
        if (str)
            inet_pton(AF_INET, str, &lnk_gre.local);

        str = nm_setting_ip_tunnel_get_remote(s_ip_tunnel);
        g_assert(str);
        inet_pton(AF_INET, str, &lnk_gre.remote);

        lnk_gre.ttl                = nm_setting_ip_tunnel_get_ttl(s_ip_tunnel);
        lnk_gre.tos                = nm_setting_ip_tunnel_get_tos(s_ip_tunnel);
        lnk_gre.path_mtu_discovery = nm_setting_ip_tunnel_get_path_mtu_discovery(s_ip_tunnel);

        val = _nm_utils_ascii_str_to_int64(nm_setting_ip_tunnel_get_input_key(s_ip_tunnel),
                                           10,
                                           0,
                                           G_MAXUINT32,
                                           -1);
        if (val != -1) {
            lnk_gre.input_key   = val;
            lnk_gre.input_flags = NM_GRE_KEY;
        }

        val = _nm_utils_ascii_str_to_int64(nm_setting_ip_tunnel_get_output_key(s_ip_tunnel),
                                           10,
                                           0,
                                           G_MAXUINT32,
                                           -1);
        if (val != -1) {
            lnk_gre.output_key   = val;
            lnk_gre.output_flags = NM_GRE_KEY;
        }

        r = nm_platform_link_gre_add(nm_device_get_platform(device),
                                     iface,
                                     mac_address_valid ? mac_address : NULL,
                                     mac_address_valid ? ETH_ALEN : 0,
                                     &lnk_gre,
                                     out_plink);
        if (r < 0) {
            g_set_error(error,
                        NM_DEVICE_ERROR,
                        NM_DEVICE_ERROR_CREATION_FAILED,
                        "Failed to create GRE interface '%s' for '%s': %s",
                        iface,
                        nm_connection_get_id(connection),
                        nm_strerror(r));
            return FALSE;
        }
        break;
    case NM_IP_TUNNEL_MODE_SIT:
        if (parent)
            lnk_sit.parent_ifindex = nm_device_get_ifindex(parent);

        str = nm_setting_ip_tunnel_get_local(s_ip_tunnel);
        if (str)
            inet_pton(AF_INET, str, &lnk_sit.local);

        str = nm_setting_ip_tunnel_get_remote(s_ip_tunnel);
        g_assert(str);
        inet_pton(AF_INET, str, &lnk_sit.remote);

        lnk_sit.ttl                = nm_setting_ip_tunnel_get_ttl(s_ip_tunnel);
        lnk_sit.tos                = nm_setting_ip_tunnel_get_tos(s_ip_tunnel);
        lnk_sit.path_mtu_discovery = nm_setting_ip_tunnel_get_path_mtu_discovery(s_ip_tunnel);

        r = nm_platform_link_sit_add(nm_device_get_platform(device), iface, &lnk_sit, out_plink);
        if (r < 0) {
            g_set_error(error,
                        NM_DEVICE_ERROR,
                        NM_DEVICE_ERROR_CREATION_FAILED,
                        "Failed to create SIT interface '%s' for '%s': %s",
                        iface,
                        nm_connection_get_id(connection),
                        nm_strerror(r));
            return FALSE;
        }
        break;
    case NM_IP_TUNNEL_MODE_IPIP:
        if (parent)
            lnk_ipip.parent_ifindex = nm_device_get_ifindex(parent);

        str = nm_setting_ip_tunnel_get_local(s_ip_tunnel);
        if (str)
            inet_pton(AF_INET, str, &lnk_ipip.local);

        str = nm_setting_ip_tunnel_get_remote(s_ip_tunnel);
        g_assert(str);
        inet_pton(AF_INET, str, &lnk_ipip.remote);

        lnk_ipip.ttl                = nm_setting_ip_tunnel_get_ttl(s_ip_tunnel);
        lnk_ipip.tos                = nm_setting_ip_tunnel_get_tos(s_ip_tunnel);
        lnk_ipip.path_mtu_discovery = nm_setting_ip_tunnel_get_path_mtu_discovery(s_ip_tunnel);

        r = nm_platform_link_ipip_add(nm_device_get_platform(device), iface, &lnk_ipip, out_plink);
        if (r < 0) {
            g_set_error(error,
                        NM_DEVICE_ERROR,
                        NM_DEVICE_ERROR_CREATION_FAILED,
                        "Failed to create IPIP interface '%s' for '%s': %s",
                        iface,
                        nm_connection_get_id(connection),
                        nm_strerror(r));
            return FALSE;
        }
        break;
    case NM_IP_TUNNEL_MODE_IPIP6:
    case NM_IP_TUNNEL_MODE_IP6IP6:
    case NM_IP_TUNNEL_MODE_IP6GRE:
    case NM_IP_TUNNEL_MODE_IP6GRETAP:
        if (parent)
            lnk_ip6tnl.parent_ifindex = nm_device_get_ifindex(parent);

        str = nm_setting_ip_tunnel_get_local(s_ip_tunnel);
        if (str)
            inet_pton(AF_INET6, str, &lnk_ip6tnl.local);

        str = nm_setting_ip_tunnel_get_remote(s_ip_tunnel);
        g_assert(str);
        inet_pton(AF_INET6, str, &lnk_ip6tnl.remote);

        lnk_ip6tnl.ttl         = nm_setting_ip_tunnel_get_ttl(s_ip_tunnel);
        lnk_ip6tnl.tclass      = nm_setting_ip_tunnel_get_tos(s_ip_tunnel);
        lnk_ip6tnl.encap_limit = nm_setting_ip_tunnel_get_encapsulation_limit(s_ip_tunnel);
        lnk_ip6tnl.flow_label  = nm_setting_ip_tunnel_get_flow_label(s_ip_tunnel);
        lnk_ip6tnl.flags =
            ip6tnl_flags_setting_to_plat(nm_setting_ip_tunnel_get_flags(s_ip_tunnel));

        if (NM_IN_SET(mode, NM_IP_TUNNEL_MODE_IP6GRE, NM_IP_TUNNEL_MODE_IP6GRETAP)) {
            val = _nm_utils_ascii_str_to_int64(nm_setting_ip_tunnel_get_input_key(s_ip_tunnel),
                                               10,
                                               0,
                                               G_MAXUINT32,
                                               -1);
            if (val != -1) {
                lnk_ip6tnl.input_key   = val;
                lnk_ip6tnl.input_flags = NM_GRE_KEY;
            }

            val = _nm_utils_ascii_str_to_int64(nm_setting_ip_tunnel_get_output_key(s_ip_tunnel),
                                               10,
                                               0,
                                               G_MAXUINT32,
                                               -1);
            if (val != -1) {
                lnk_ip6tnl.output_key   = val;
                lnk_ip6tnl.output_flags = NM_GRE_KEY;
            }

            lnk_ip6tnl.is_gre = TRUE;
            lnk_ip6tnl.is_tap = (mode == NM_IP_TUNNEL_MODE_IP6GRETAP);

            r = nm_platform_link_ip6gre_add(nm_device_get_platform(device),
                                            iface,
                                            mac_address_valid ? mac_address : NULL,
                                            mac_address_valid ? ETH_ALEN : 0,
                                            &lnk_ip6tnl,
                                            out_plink);
        } else {
            lnk_ip6tnl.proto = nm_setting_ip_tunnel_get_mode(s_ip_tunnel) == NM_IP_TUNNEL_MODE_IPIP6
                                   ? IPPROTO_IPIP
                                   : IPPROTO_IPV6;
            r                = nm_platform_link_ip6tnl_add(nm_device_get_platform(device),
                                            iface,
                                            &lnk_ip6tnl,
                                            out_plink);
        }
        if (r < 0) {
            g_set_error(error,
                        NM_DEVICE_ERROR,
                        NM_DEVICE_ERROR_CREATION_FAILED,
                        "Failed to create IPv6 tunnel interface '%s' for '%s': %s",
                        iface,
                        nm_connection_get_id(connection),
                        nm_strerror(r));
            return FALSE;
        }
        break;
    default:
        g_set_error(error,
                    NM_DEVICE_ERROR,
                    NM_DEVICE_ERROR_CREATION_FAILED,
                    "Failed to create IP tunnel interface '%s' for '%s': mode %d not supported",
                    iface,
                    nm_connection_get_id(connection),
                    (int) nm_setting_ip_tunnel_get_mode(s_ip_tunnel));
        return FALSE;
    }

    return TRUE;
}

static guint32
get_configured_mtu(NMDevice *device, NMDeviceMtuSource *out_source, gboolean *out_force)
{
    return nm_device_get_configured_mtu_from_connection(device,
                                                        NM_TYPE_SETTING_IP_TUNNEL,
                                                        out_source);
}

static NMDeviceCapabilities
get_generic_capabilities(NMDevice *device)
{
    return NM_DEVICE_CAP_IS_SOFTWARE;
}

static void
unrealize_notify(NMDevice *device)
{
    NM_DEVICE_CLASS(nm_device_ip_tunnel_parent_class)->unrealize_notify(device);

    update_properties_from_ifindex(device, 0);
}

static gboolean
can_reapply_change(NMDevice *  device,
                   const char *setting_name,
                   NMSetting * s_old,
                   NMSetting * s_new,
                   GHashTable *diffs,
                   GError **   error)
{
    NMDeviceClass *device_class;

    /* Only handle ip-tunnel setting here, delegate other settings to parent class */
    if (nm_streq(setting_name, NM_SETTING_IP_TUNNEL_SETTING_NAME)) {
        return nm_device_hash_check_invalid_keys(
            diffs,
            NM_SETTING_IP_TUNNEL_SETTING_NAME,
            error,
            NM_SETTING_IP_TUNNEL_MTU); /* reapplied with IP config */
    }

    device_class = NM_DEVICE_CLASS(nm_device_ip_tunnel_parent_class);
    return device_class->can_reapply_change(device, setting_name, s_old, s_new, diffs, error);
}

static NMActStageReturn
act_stage1_prepare(NMDevice *device, NMDeviceStateReason *out_failure_reason)
{
    NMDeviceIPTunnel *       self = NM_DEVICE_IP_TUNNEL(device);
    NMDeviceIPTunnelPrivate *priv = NM_DEVICE_IP_TUNNEL_GET_PRIVATE(self);

    if (_nm_ip_tunnel_mode_is_layer2(priv->mode)
        && !nm_device_hw_addr_set_cloned(device, nm_device_get_applied_connection(device), FALSE)) {
        *out_failure_reason = NM_DEVICE_STATE_REASON_CONFIG_FAILED;
        return NM_ACT_STAGE_RETURN_FAILURE;
    }

    return NM_ACT_STAGE_RETURN_SUCCESS;
}

/*****************************************************************************/

static void
get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
    NMDeviceIPTunnelPrivate *priv = NM_DEVICE_IP_TUNNEL_GET_PRIVATE(object);

    switch (prop_id) {
    case PROP_MODE:
        g_value_set_uint(value, priv->mode);
        break;
    case PROP_LOCAL:
        g_value_set_string(value, priv->local);
        break;
    case PROP_REMOTE:
        g_value_set_string(value, priv->remote);
        break;
    case PROP_TTL:
        g_value_set_uchar(value, priv->ttl);
        break;
    case PROP_TOS:
        g_value_set_uchar(value, priv->tos);
        break;
    case PROP_PATH_MTU_DISCOVERY:
        g_value_set_boolean(value, priv->path_mtu_discovery);
        break;
    case PROP_INPUT_KEY:
        g_value_set_string(value, priv->input_key);
        break;
    case PROP_OUTPUT_KEY:
        g_value_set_string(value, priv->output_key);
        break;
    case PROP_ENCAPSULATION_LIMIT:
        g_value_set_uchar(value, priv->encap_limit);
        break;
    case PROP_FLOW_LABEL:
        g_value_set_uint(value, priv->flow_label);
        break;
    case PROP_FLAGS:
        g_value_set_uint(value, priv->flags);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
        break;
    }
}

static void
set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
    NMDeviceIPTunnelPrivate *priv = NM_DEVICE_IP_TUNNEL_GET_PRIVATE(object);

    switch (prop_id) {
    case PROP_MODE:
        priv->mode = g_value_get_uint(value);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
    }
}

/*****************************************************************************/

static void
nm_device_ip_tunnel_init(NMDeviceIPTunnel *self)
{}

static void
constructed(GObject *object)
{
    NMDeviceIPTunnelPrivate *priv = NM_DEVICE_IP_TUNNEL_GET_PRIVATE(object);

    if (NM_IN_SET(priv->mode,
                  NM_IP_TUNNEL_MODE_IPIP6,
                  NM_IP_TUNNEL_MODE_IP6IP6,
                  NM_IP_TUNNEL_MODE_IP6GRE,
                  NM_IP_TUNNEL_MODE_IP6GRETAP))
        priv->addr_family = AF_INET6;
    else
        priv->addr_family = AF_INET;

    G_OBJECT_CLASS(nm_device_ip_tunnel_parent_class)->constructed(object);
}

static void
dispose(GObject *object)
{
    NMDeviceIPTunnel *       self = NM_DEVICE_IP_TUNNEL(object);
    NMDeviceIPTunnelPrivate *priv = NM_DEVICE_IP_TUNNEL_GET_PRIVATE(self);

    nm_clear_g_free(&priv->local);
    nm_clear_g_free(&priv->remote);
    nm_clear_g_free(&priv->input_key);
    nm_clear_g_free(&priv->output_key);

    G_OBJECT_CLASS(nm_device_ip_tunnel_parent_class)->dispose(object);
}

static const NMDBusInterfaceInfoExtended interface_info_device_ip_tunnel = {
    .parent = NM_DEFINE_GDBUS_INTERFACE_INFO_INIT(
        NM_DBUS_INTERFACE_DEVICE_IP_TUNNEL,
        .properties = NM_DEFINE_GDBUS_PROPERTY_INFOS(
            NM_DEFINE_DBUS_PROPERTY_INFO_EXTENDED_READABLE("Mode", "u", NM_DEVICE_IP_TUNNEL_MODE),
            NM_DEFINE_DBUS_PROPERTY_INFO_EXTENDED_READABLE("Parent", "o", NM_DEVICE_PARENT),
            NM_DEFINE_DBUS_PROPERTY_INFO_EXTENDED_READABLE("Local", "s", NM_DEVICE_IP_TUNNEL_LOCAL),
            NM_DEFINE_DBUS_PROPERTY_INFO_EXTENDED_READABLE("Remote",
                                                           "s",
                                                           NM_DEVICE_IP_TUNNEL_REMOTE),
            NM_DEFINE_DBUS_PROPERTY_INFO_EXTENDED_READABLE("Ttl", "y", NM_DEVICE_IP_TUNNEL_TTL),
            NM_DEFINE_DBUS_PROPERTY_INFO_EXTENDED_READABLE("Tos", "y", NM_DEVICE_IP_TUNNEL_TOS),
            NM_DEFINE_DBUS_PROPERTY_INFO_EXTENDED_READABLE("PathMtuDiscovery",
                                                           "b",
                                                           NM_DEVICE_IP_TUNNEL_PATH_MTU_DISCOVERY),
            NM_DEFINE_DBUS_PROPERTY_INFO_EXTENDED_READABLE("InputKey",
                                                           "s",
                                                           NM_DEVICE_IP_TUNNEL_INPUT_KEY),
            NM_DEFINE_DBUS_PROPERTY_INFO_EXTENDED_READABLE("OutputKey",
                                                           "s",
                                                           NM_DEVICE_IP_TUNNEL_OUTPUT_KEY),
            NM_DEFINE_DBUS_PROPERTY_INFO_EXTENDED_READABLE("EncapsulationLimit",
                                                           "y",
                                                           NM_DEVICE_IP_TUNNEL_ENCAPSULATION_LIMIT),
            NM_DEFINE_DBUS_PROPERTY_INFO_EXTENDED_READABLE("FlowLabel",
                                                           "u",
                                                           NM_DEVICE_IP_TUNNEL_FLOW_LABEL),
            NM_DEFINE_DBUS_PROPERTY_INFO_EXTENDED_READABLE("Flags",
                                                           "u",
                                                           NM_DEVICE_IP_TUNNEL_FLAGS), ), ),
};

static void
nm_device_ip_tunnel_class_init(NMDeviceIPTunnelClass *klass)
{
    GObjectClass *     object_class      = G_OBJECT_CLASS(klass);
    NMDBusObjectClass *dbus_object_class = NM_DBUS_OBJECT_CLASS(klass);
    NMDeviceClass *    device_class      = NM_DEVICE_CLASS(klass);

    object_class->constructed  = constructed;
    object_class->dispose      = dispose;
    object_class->get_property = get_property;
    object_class->set_property = set_property;

    dbus_object_class->interface_infos = NM_DBUS_INTERFACE_INFOS(&interface_info_device_ip_tunnel);

    device_class->connection_type_supported        = NM_SETTING_IP_TUNNEL_SETTING_NAME;
    device_class->connection_type_check_compatible = NM_SETTING_IP_TUNNEL_SETTING_NAME;
    device_class->link_types                       = NM_DEVICE_DEFINE_LINK_TYPES(NM_LINK_TYPE_GRE,
                                                           NM_LINK_TYPE_GRETAP,
                                                           NM_LINK_TYPE_IP6TNL,
                                                           NM_LINK_TYPE_IP6GRE,
                                                           NM_LINK_TYPE_IP6GRETAP,
                                                           NM_LINK_TYPE_IPIP,
                                                           NM_LINK_TYPE_SIT);

    device_class->act_stage1_prepare          = act_stage1_prepare;
    device_class->link_changed                = link_changed;
    device_class->can_reapply_change          = can_reapply_change;
    device_class->complete_connection         = complete_connection;
    device_class->update_connection           = update_connection;
    device_class->check_connection_compatible = check_connection_compatible;
    device_class->create_and_realize          = create_and_realize;
    device_class->get_generic_capabilities    = get_generic_capabilities;
    device_class->get_configured_mtu          = get_configured_mtu;
    device_class->unrealize_notify            = unrealize_notify;

    obj_properties[PROP_MODE] =
        g_param_spec_uint(NM_DEVICE_IP_TUNNEL_MODE,
                          "",
                          "",
                          0,
                          G_MAXUINT,
                          0,
                          G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS);

    obj_properties[PROP_LOCAL] = g_param_spec_string(NM_DEVICE_IP_TUNNEL_LOCAL,
                                                     "",
                                                     "",
                                                     NULL,
                                                     G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

    obj_properties[PROP_REMOTE] = g_param_spec_string(NM_DEVICE_IP_TUNNEL_REMOTE,
                                                      "",
                                                      "",
                                                      NULL,
                                                      G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

    obj_properties[PROP_TTL] = g_param_spec_uchar(NM_DEVICE_IP_TUNNEL_TTL,
                                                  "",
                                                  "",
                                                  0,
                                                  255,
                                                  0,
                                                  G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

    obj_properties[PROP_TOS] = g_param_spec_uchar(NM_DEVICE_IP_TUNNEL_TOS,
                                                  "",
                                                  "",
                                                  0,
                                                  255,
                                                  0,
                                                  G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

    obj_properties[PROP_PATH_MTU_DISCOVERY] =
        g_param_spec_boolean(NM_DEVICE_IP_TUNNEL_PATH_MTU_DISCOVERY,
                             "",
                             "",
                             FALSE,
                             G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

    obj_properties[PROP_INPUT_KEY] = g_param_spec_string(NM_DEVICE_IP_TUNNEL_INPUT_KEY,
                                                         "",
                                                         "",
                                                         NULL,
                                                         G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

    obj_properties[PROP_OUTPUT_KEY] =
        g_param_spec_string(NM_DEVICE_IP_TUNNEL_OUTPUT_KEY,
                            "",
                            "",
                            NULL,
                            G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

    obj_properties[PROP_ENCAPSULATION_LIMIT] =
        g_param_spec_uchar(NM_DEVICE_IP_TUNNEL_ENCAPSULATION_LIMIT,
                           "",
                           "",
                           0,
                           255,
                           0,
                           G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

    obj_properties[PROP_FLOW_LABEL] = g_param_spec_uint(NM_DEVICE_IP_TUNNEL_FLOW_LABEL,
                                                        "",
                                                        "",
                                                        0,
                                                        (1 << 20) - 1,
                                                        0,
                                                        G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

    obj_properties[PROP_FLAGS] = g_param_spec_uint(NM_DEVICE_IP_TUNNEL_FLAGS,
                                                   "",
                                                   "",
                                                   0,
                                                   G_MAXUINT32,
                                                   0,
                                                   G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);

    g_object_class_install_properties(object_class, _PROPERTY_ENUMS_LAST, obj_properties);
}

/*****************************************************************************/

#define NM_TYPE_IP_TUNNEL_DEVICE_FACTORY (nm_ip_tunnel_device_factory_get_type())
#define NM_IP_TUNNEL_DEVICE_FACTORY(obj) \
    (G_TYPE_CHECK_INSTANCE_CAST((obj), NM_TYPE_IP_TUNNEL_DEVICE_FACTORY, NMIPTunnelDeviceFactory))

static NMDevice *
create_device(NMDeviceFactory *     factory,
              const char *          iface,
              const NMPlatformLink *plink,
              NMConnection *        connection,
              gboolean *            out_ignore)
{
    NMSettingIPTunnel *s_ip_tunnel;
    NMIPTunnelMode     mode;
    NMLinkType         link_type;

    if (connection) {
        s_ip_tunnel = nm_connection_get_setting_ip_tunnel(connection);
        mode        = nm_setting_ip_tunnel_get_mode(s_ip_tunnel);
        link_type   = tunnel_mode_to_link_type(mode);
    } else {
        link_type = plink->type;
        mode      = platform_link_to_tunnel_mode(plink);
    }

    if (mode == NM_IP_TUNNEL_MODE_UNKNOWN || link_type == NM_LINK_TYPE_UNKNOWN)
        return NULL;

    return g_object_new(NM_TYPE_DEVICE_IP_TUNNEL,
                        NM_DEVICE_IFACE,
                        iface,
                        NM_DEVICE_TYPE_DESC,
                        "IPTunnel",
                        NM_DEVICE_DEVICE_TYPE,
                        NM_DEVICE_TYPE_IP_TUNNEL,
                        NM_DEVICE_LINK_TYPE,
                        link_type,
                        NM_DEVICE_IP_TUNNEL_MODE,
                        mode,
                        NULL);
}

static const char *
get_connection_parent(NMDeviceFactory *factory, NMConnection *connection)
{
    NMSettingIPTunnel *s_ip_tunnel;

    g_return_val_if_fail(nm_connection_is_type(connection, NM_SETTING_IP_TUNNEL_SETTING_NAME),
                         NULL);

    s_ip_tunnel = nm_connection_get_setting_ip_tunnel(connection);
    g_assert(s_ip_tunnel);

    return nm_setting_ip_tunnel_get_parent(s_ip_tunnel);
}

static char *
get_connection_iface(NMDeviceFactory *factory, NMConnection *connection, const char *parent_iface)
{
    const char *       ifname;
    NMSettingIPTunnel *s_ip_tunnel;

    g_return_val_if_fail(nm_connection_is_type(connection, NM_SETTING_IP_TUNNEL_SETTING_NAME),
                         NULL);

    s_ip_tunnel = nm_connection_get_setting_ip_tunnel(connection);
    g_assert(s_ip_tunnel);

    if (nm_setting_ip_tunnel_get_parent(s_ip_tunnel) && !parent_iface)
        return NULL;

    ifname = nm_connection_get_interface_name(connection);

    return g_strdup(ifname);
}

NM_DEVICE_FACTORY_DEFINE_INTERNAL(
    IP_TUNNEL,
    IPTunnel,
    ip_tunnel,
    NM_DEVICE_FACTORY_DECLARE_LINK_TYPES(NM_LINK_TYPE_GRE,
                                         NM_LINK_TYPE_GRETAP,
                                         NM_LINK_TYPE_SIT,
                                         NM_LINK_TYPE_IPIP,
                                         NM_LINK_TYPE_IP6TNL,
                                         NM_LINK_TYPE_IP6GRE,
                                         NM_LINK_TYPE_IP6GRETAP)
        NM_DEVICE_FACTORY_DECLARE_SETTING_TYPES(NM_SETTING_IP_TUNNEL_SETTING_NAME),
    factory_class->create_device         = create_device;
    factory_class->get_connection_parent = get_connection_parent;
    factory_class->get_connection_iface  = get_connection_iface;);
