/* $NetBSD: tlv.h,v 1.5 2022/02/07 02:35:09 rillig Exp $ */

/*-
 * Copyright (c) 2010 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Mihai Chelaru <kefren@NetBSD.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _TLV_H_
#define _TLV_H_

/* TLV messages */
#define TLV_FEC                 0x0100
#define TLV_ADDRESS_LIST        0x0101
#define TLV_HOP_COUNT           0x0103
#define TLV_PATH_VECTOR         0x0104
#define TLV_GENERIC_LABEL       0x0200
#define TLV_ATM_LABEL           0x0201
#define TLV_FR_LABEL            0x0202
#define TLV_STATUS              0x0300
#define TLV_EXTENDED_STATUS     0x0301
#define TLV_RETURNED_PDU        0x0302
#define TLV_RETURNED_MESSAGE    0x0303
#define TLV_COMMON_HELLO        0x0400
#define TLV_IPV4_TRANSPORT      0x0401
#define TLV_CONFIGURATION_SEQ   0x0402
#define TLV_IPV6_TRANSPORT      0x0403
#define TLV_COMMON_SESSION      0x0500
#define TLV_ATM_SESSION         0x0501
#define TLV_FR_SESSION          0x0502
#define TLV_LABEL_REQUEST       0x0600

/* Some common lengths in order to avoid writing them every time */
#define TLV_TYPE_LENGTH (sizeof(uint16_t) + sizeof(uint16_t))
#define MSGID_SIZE (sizeof(uint32_t))

/* General TLV structure */
struct tlv {
        uint16_t       type;
        uint16_t       length;
        uint32_t       messageid;
}               __packed;

/* Common Hello TLV structure */
struct common_hello_tlv {
        uint16_t       type;
        uint16_t       length;
        uint16_t       holdtime;
        uint16_t       res;
}               __packed;

/* Hello TLV structure */
struct hello_tlv {
        uint16_t       type;
        uint16_t       length;
        uint32_t       messageid;
        struct common_hello_tlv ch;
        /* XXX: optional parameters */
}               __packed;

/* Transport address TLV */
struct transport_address_tlv {
        uint16_t       type;
        uint16_t       length;
        union {
                struct in_addr  ip4addr;
                struct in6_addr ip6addr;
        } address;
}               __packed;


#define CS_LEN (sizeof(struct init_tlv) - TLV_TYPE_LENGTH - MSGID_SIZE - \
                sizeof(uint32_t))

/* Initialization TLV structure */
struct init_tlv {
        uint16_t       type;
        uint16_t       length;
        uint32_t       messageid;
        /*
         * Common Session Parameters
         */
        uint16_t       cs_type;
        uint16_t       cs_len;
        uint16_t       cs_version;
        uint16_t       cs_keepalive;
        uint16_t       cs_adpvlim;      /* XXX */
        uint16_t       cs_maxpdulen;
        struct in_addr  cs_peeraddress;
        uint16_t       cs_peeraddrspace;
}               __packed;

/* Keepalive TLV */
struct ka_tlv {                 /* Keepalive message */
        uint16_t       type;
        uint16_t       length;
        uint32_t       messageid;
}               __packed;

/* Notification TLV */
struct notification_tlv {
        uint16_t       type;
        uint16_t       length;
        uint32_t       messageid;
        uint16_t       status;
        uint16_t       st_len;
        uint32_t       st_code;
        uint32_t       msg_id;
        uint32_t       msg_type;
}               __packed;

/* Address LIST TLV for SEND */
struct address_list_tlv {
        uint16_t       type;
        uint16_t       length;
        uint32_t       messageid;
        uint16_t       a_type;
        uint16_t       a_length;
        uint16_t       a_af;
        struct in_addr  a_address;
}               __packed;

/* Real AL TLV used for RCV for now */
struct al_tlv {
        uint16_t       type;
        uint16_t       length;
        uint16_t       af;
        struct in_addr  address;
}               __packed;

struct address_tlv {
        uint16_t       type;
        uint16_t       length;
        uint32_t       messageid;
}               __packed;

/* Label map TLV */
struct label_map_tlv {
        uint16_t       type;
        uint16_t       length;
        uint32_t       messageid;
}               __packed;

/* FEC TLV */
struct fec_tlv {
        uint16_t       type;
        uint16_t       length;
}               __packed;

struct prefix_tlv {
        uint8_t        type;
        uint16_t       af;
        uint8_t        prelen;
        struct in_addr  prefix;
}               __packed;

struct host_tlv {
        uint8_t        type;
        uint16_t       af;
        uint8_t        length;
        struct in_addr  address;
}               __packed;

struct label_tlv {
        uint16_t       type;
        uint16_t       length;
        uint32_t       label;
}               __packed;

/* Label Request Message ID TLV */
struct label_request_tlv {
        uint16_t        type;
        uint16_t        length; /* 4 */
        uint32_t        messageid;
}               __packed;

struct hello_tlv *      get_hello_tlv(unsigned char *, uint);
void                    debug_tlv(struct tlv *);

#endif  /* !_TLV_H_ */