/*
 * Copyright 2015, LabN Consulting, L.L.C.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

#ifndef _QUAGGA_BGP_ENCAP_TYPES_H
#define _QUAGGA_BGP_ENCAP_TYPES_H

/* from http://www.iana.org/assignments/bgp-parameters/bgp-parameters.xhtml#tunnel-types */
typedef enum {
    BGP_ENCAP_TYPE_RESERVED=0,
    BGP_ENCAP_TYPE_L2TPV3_OVER_IP=1,
    BGP_ENCAP_TYPE_GRE=2,
    BGP_ENCAP_TYPE_TRANSMIT_TUNNEL_ENDPOINT=3,
    BGP_ENCAP_TYPE_IPSEC_IN_TUNNEL_MODE=4,
    BGP_ENCAP_TYPE_IP_IN_IP_TUNNEL_WITH_IPSEC_TRANSPORT_MODE=5,
    BGP_ENCAP_TYPE_MPLS_IN_IP_TUNNEL_WITH_IPSEC_TRANSPORT_MODE=6,
    BGP_ENCAP_TYPE_IP_IN_IP=7,
    BGP_ENCAP_TYPE_VXLAN=8,
    BGP_ENCAP_TYPE_NVGRE=9,
    BGP_ENCAP_TYPE_MPLS=10,
    BGP_ENCAP_TYPE_MPLS_IN_GRE=11,
    BGP_ENCAP_TYPE_VXLAN_GPE=12,
    BGP_ENCAP_TYPE_MPLS_IN_UDP=13,
    BGP_ENCAP_TYPE_PBB
} bgp_encap_types;

typedef enum {
    BGP_ENCAP_SUBTLV_TYPE_ENCAPSULATION=1,
    BGP_ENCAP_SUBTLV_TYPE_PROTO_TYPE=2,
    BGP_ENCAP_SUBTLV_TYPE_IPSEC_TA=3,
    BGP_ENCAP_SUBTLV_TYPE_COLOR=4,
    BGP_ENCAP_SUBTLV_TYPE_REMOTE_ENDPOINT=6 /* speculative, IANA assignment TBD */
} bgp_encap_subtlv_types;

/*
 * Tunnel Encapsulation Attribute subtlvs
 */
struct bgp_tea_subtlv_encap_l2tpv3_over_ip {
    uint32_t	sessionid;
    uint8_t	cookie_length;
    uint8_t	cookie[8];
};

struct bgp_tea_subtlv_encap_gre_key {
    uint32_t	gre_key;
};

struct bgp_tea_subtlv_encap_pbb {
    uint32_t	flag_isid:1;
    uint32_t	flag_vid:1;
    uint32_t	isid:24;
    uint16_t	vid:12;
    uint8_t	macaddr[6];
};

struct bgp_tea_subtlv_proto_type {
    uint16_t	proto;			/* ether-type */
};

struct bgp_tea_subtlv_color {
    uint32_t	color;
};

/* per draft-rosen-idr-tunnel-encaps */
struct bgp_tea_subtlv_remote_endpoint {
    u_char family;               /* IPv4 or IPv6 */
    union {
        struct in_addr  v4;
        struct in6_addr v6;
    } ip_address;
    as_t	        as4;     /* always 4 bytes */
};

/*
 * This is the length of the value part of the ipsec tunnel authenticator
 * subtlv. Currently we only support the length for authenticator type 1.
 */
#define BGP_ENCAP_SUBTLV_IPSEC_TA_SIZE	20

struct bgp_tea_subtlv_ipsec_ta {
    uint16_t	authenticator_type;	/* only type 1 is supported so far */
    uint8_t	authenticator_length;	/* octets in value field */
    uint8_t	value[BGP_ENCAP_SUBTLV_IPSEC_TA_SIZE];
};

/*
 * Subtlv valid flags
 * TBD change names to add "VALID"
 */
#define BGP_TEA_SUBTLV_ENCAP		0x00000001
#define BGP_TEA_SUBTLV_PROTO_TYPE	0x00000002
#define BGP_TEA_SUBTLV_COLOR		0x00000004
#define BGP_TEA_SUBTLV_IPSEC_TA		0x00000008
#define BGP_TEA_SUBTLV_REMOTE_ENDPOINT	0x00000010

#define CHECK_SUBTLV_FLAG(ptr, flag)  CHECK_FLAG((ptr)->valid_subtlvs, (flag))
#define SET_SUBTLV_FLAG(ptr, flag)      SET_FLAG((ptr)->valid_subtlvs, (flag))
#define UNSET_SUBTLV_FLAG(ptr, flag)  UNSET_FLAG((ptr)->valid_subtlvs, (flag))

/*
 * Tunnel Type-specific APIs
 */
struct bgp_encap_type_reserved {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
};

struct bgp_encap_type_l2tpv3_over_ip {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_encap_l2tpv3_over_ip	st_encap;
    struct bgp_tea_subtlv_proto_type		st_proto;	/* optional */
    struct bgp_tea_subtlv_color			st_color;	/* optional */
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
};

struct bgp_encap_type_gre {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_encap_gre_key		st_encap;	/* optional */
    struct bgp_tea_subtlv_proto_type		st_proto;	/* optional */
    struct bgp_tea_subtlv_color			st_color;	/* optional */
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
};

struct bgp_encap_type_ip_in_ip {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_proto_type		st_proto;	/* optional */
    struct bgp_tea_subtlv_color			st_color;	/* optional */
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
};

struct bgp_encap_type_transmit_tunnel_endpoint {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
    /* No subtlvs defined in spec? */
};

struct bgp_encap_type_ipsec_in_tunnel_mode {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_ipsec_ta		st_ipsec_ta;	/* optional */
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
};

struct bgp_encap_type_ip_in_ip_tunnel_with_ipsec_transport_mode {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_ipsec_ta		st_ipsec_ta;	/* optional */
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
};

struct bgp_encap_type_mpls_in_ip_tunnel_with_ipsec_transport_mode {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_ipsec_ta		st_ipsec_ta;	/* optional */
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
};

struct bgp_encap_type_vxlan {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
    /* No subtlvs defined in spec? */
};

struct bgp_encap_type_nvgre {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
    /* No subtlvs defined in spec? */
};

struct bgp_encap_type_mpls {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
    /* No subtlvs defined in spec? */
};

struct bgp_encap_type_mpls_in_gre {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
    /* No subtlvs defined in spec? */
};

struct bgp_encap_type_vxlan_gpe {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
    /* No subtlvs defined in spec? */
};

struct bgp_encap_type_mpls_in_udp {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
    /* No subtlvs defined in spec? */
};

struct bgp_encap_type_pbb {
    uint32_t					valid_subtlvs;
    struct bgp_tea_subtlv_remote_endpoint       st_endpoint;    /* optional */
    struct bgp_tea_subtlv_encap_pbb		st_encap;
};

#endif /* _QUAGGA_BGP_ENCAP_TYPES_H */