/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once

#include "shared-forward.h"
#include "fou-tunnel.h"
#include "netdev.h"
#include "networkd-link.h"

/* For IFLA_IPTUN_PROTO attribute */
typedef enum TunnelMode {
        TUNNEL_MODE_ANY,    /* 0, "any" */
        TUNNEL_MODE_IPIP,   /* IPPROTO_IPIP, "ipip", for ipip and sit */
        TUNNEL_MODE_IP6IP,  /* IPPROTO_IPV6, "ip6ip", for sit */
        TUNNEL_MODE_IPIP6,  /* IPPROTO_IPIP, "ipip6", for ip6tnl */
        TUNNEL_MODE_IP6IP6, /* IPPROTO_IPV6, "ip6ip6", for ip6tnl */
        _TUNNEL_MODE_MAX,
        _TUNNEL_MODE_INVALID = -EINVAL,
} TunnelMode;

typedef enum IPv6FlowLabel {
        NETDEV_IPV6_FLOWLABEL_INHERIT = 0xFFFFF + 1,
        _NETDEV_IPV6_FLOWLABEL_MAX,
        _NETDEV_IPV6_FLOWLABEL_INVALID = -EINVAL,
} IPv6FlowLabel;

typedef struct Tunnel {
        NetDev meta;

        uint8_t encap_limit;

        int family;
        int ipv6_flowlabel;
        int allow_localremote;
        int gre_erspan_sequence;
        int isatap;

        unsigned ttl;
        unsigned tos;
        unsigned flags;

        uint32_t key;
        uint32_t ikey;
        uint32_t okey;

        uint8_t erspan_version;
        uint32_t erspan_index;    /* version 1 */
        uint8_t erspan_direction; /* version 2 */
        uint16_t erspan_hwid;     /* version 2 */

        NetDevLocalAddressType local_type;
        union in_addr_union local;
        union in_addr_union remote;

        TunnelMode mode;
        FooOverUDPEncapType fou_encap_type;

        int pmtudisc;
        bool ignore_df;
        bool copy_dscp;
        bool independent;
        bool fou_tunnel;
        bool assign_to_loopback;
        bool external; /* a.k.a collect metadata mode */

        uint16_t encap_src_port;
        uint16_t fou_destination_port;

        struct in6_addr sixrd_prefix;
        uint8_t sixrd_prefixlen;
} Tunnel;

int dhcp4_pd_create_6rd_tunnel(Link *link, link_netlink_message_handler_t callback);

DEFINE_NETDEV_CAST(IPIP, Tunnel);
DEFINE_NETDEV_CAST(GRE, Tunnel);
DEFINE_NETDEV_CAST(GRETAP, Tunnel);
DEFINE_NETDEV_CAST(IP6GRE, Tunnel);
DEFINE_NETDEV_CAST(IP6GRETAP, Tunnel);
DEFINE_NETDEV_CAST(SIT, Tunnel);
DEFINE_NETDEV_CAST(VTI, Tunnel);
DEFINE_NETDEV_CAST(VTI6, Tunnel);
DEFINE_NETDEV_CAST(IP6TNL, Tunnel);
DEFINE_NETDEV_CAST(ERSPAN, Tunnel);

static inline Tunnel* TUNNEL(NetDev *netdev) {
        assert(netdev);

        switch (netdev->kind) {
        case NETDEV_KIND_IPIP:
                return IPIP(netdev);
        case NETDEV_KIND_SIT:
                return SIT(netdev);
        case NETDEV_KIND_GRE:
                return GRE(netdev);
        case NETDEV_KIND_GRETAP:
                return GRETAP(netdev);
        case NETDEV_KIND_IP6GRE:
                return IP6GRE(netdev);
        case NETDEV_KIND_IP6GRETAP:
                return IP6GRETAP(netdev);
        case NETDEV_KIND_VTI:
                return VTI(netdev);
        case NETDEV_KIND_VTI6:
                return VTI6(netdev);
        case NETDEV_KIND_IP6TNL:
                return IP6TNL(netdev);
        case NETDEV_KIND_ERSPAN:
                return ERSPAN(netdev);
        default:
                return NULL;
        }
}

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;
extern const NetDevVTable ip6gretap_vtable;
extern const NetDevVTable ip6tnl_vtable;
extern const NetDevVTable erspan_vtable;

const char* tunnel_mode_to_string(TunnelMode d) _const_;
TunnelMode tunnel_mode_from_string(const char *s) _pure_;

CONFIG_PARSER_PROTOTYPE(config_parse_tunnel_mode);
CONFIG_PARSER_PROTOTYPE(config_parse_tunnel_local_address);
CONFIG_PARSER_PROTOTYPE(config_parse_tunnel_remote_address);
CONFIG_PARSER_PROTOTYPE(config_parse_ipv6_flowlabel);
CONFIG_PARSER_PROTOTYPE(config_parse_encap_limit);
CONFIG_PARSER_PROTOTYPE(config_parse_tunnel_key);
CONFIG_PARSER_PROTOTYPE(config_parse_6rd_prefix);
CONFIG_PARSER_PROTOTYPE(config_parse_erspan_version);
CONFIG_PARSER_PROTOTYPE(config_parse_erspan_index);
CONFIG_PARSER_PROTOTYPE(config_parse_erspan_direction);
CONFIG_PARSER_PROTOTYPE(config_parse_erspan_hwid);
