/*

 * Copyright (c) 2010-2011, Red Hat, Inc.

 *

 * Permission to use, copy, modify, and/or distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND RED HAT, INC. DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL RED HAT, INC. BE LIABLE

 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION

 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN

 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 */

/*

 * Author: Jan Friesse <jfriesse@redhat.com>

 */

#ifndef _TLV_H_

#define _TLV_H_

#include <sys/socket.h>

#include <netinet/in.h>

#ifdef __cplusplus

extern "C" {

#endif

/*

 * Definitions

 */

/*

 * Address families how defined by AIANA

 */

enum {

	AF_IANA_IP	= 1,

	AF_IANA_IP6	= 2,

};

/*

 * TLV option type definition

 */

enum tlv_opt_type {

	TLV_OPT_TYPE_VERSION		=  0,

	TLV_OPT_TYPE_CLIENT_ID		=  1,

	TLV_OPT_TYPE_SEQ_NUM		=  2,

	TLV_OPT_TYPE_CLIENT_TSTAMP	=  3,

	TLV_OPT_TYPE_MCAST_GRP		=  4,

	TLV_OPT_TYPE_OPT_REQUEST	=  5,

	TLV_OPT_TYPE_SERVER_INFO	=  6,

	/* 7 and 8 are reserved and copied only */

	TLV_OPT_TYPE_TTL		=  9,

	TLV_OPT_TYPE_MCAST_PREFIX	= 10,

	TLV_OPT_TYPE_SES_ID		= 11,

	TLV_OPT_TYPE_SERVER_TSTAMP	= 12,

};

/*

 * tlv_iterator type

 */

struct tlv_iterator {

	const char	*msg;

	size_t		msg_len;

	size_t		pos;

};

/*

 * Functions

 */

extern int	tlv_add(char *msg, size_t msg_len, size_t *pos, enum tlv_opt_type opt_type,

    uint16_t opt_len, const void *value);

extern int	tlv_add_client_tstamp(char *msg, size_t msg_len, size_t *pos);

extern int	tlv_add_mcast_grp(char *msg, size_t msg_len, size_t *pos,

    const struct sockaddr_storage *sas);

extern int	tlv_add_mcast_prefix(char *msg, size_t msg_len, size_t *pos,

    const struct sockaddr_storage *sas);

extern int	tlv_add_opt_request(char *msg, size_t msg_len, size_t *pos, uint16_t *opts,

    size_t opts_len);

extern int	tlv_add_seq_num(char *msg, size_t msg_len, size_t *pos, uint32_t seq);

extern int	tlv_add_server_info(char *msg, size_t msg_len, size_t *pos,

    const char *server_info);

extern int	tlv_add_server_tstamp(char *msg, size_t msg_len, size_t *pos);

extern int	tlv_add_ttl(char *msg, size_t msg_len, size_t *pos, uint8_t ttl);

extern int	tlv_add_version(char *msg, size_t msg_len, size_t *pos);

extern const char	*tlv_iter_get_data(const struct tlv_iterator *tlv_iter);

extern uint16_t	tlv_iter_get_len(const struct tlv_iterator *tlv_iter);

extern enum tlv_opt_type	tlv_iter_get_type(const struct tlv_iterator *tlv_iter);

extern void	tlv_iter_init(const char *msg, size_t msg_len, struct tlv_iterator *tlv_iter);

extern int	tlv_iter_item_copy(const struct tlv_iterator *tlv_iter, char *new_msg,

    size_t new_msg_len,    size_t *pos);

extern int	tlv_iter_next(struct tlv_iterator *tlv_iter);

extern int	tlv_iter_pref_eq(const struct tlv_iterator *tlv_iter,

    const struct sockaddr_storage *sas);

extern int	tlv_mcast_grp_eq(const struct sockaddr_storage *sas, const char *mcast_grp,

    size_t mcast_grp_len);

extern const char	*tlv_opt_type_to_str(enum tlv_opt_type opt);

extern int	tlv_pref_eq(const struct sockaddr_storage *sas, uint16_t iana_af, uint8_t prefix,

    const char *addr);

#ifdef __cplusplus

}

#endif

#endif /* _TLV_H_ */