/*
 * librelay.h
 *
 * IPQ library for userspace.
 *
 * ----------, James Morris, original libipq cod
 * 2003-10-29, Don Mahurin, adopted for use with iptables RELAY module
 *
 * Copyright (c) 2000-2001 Netfilter Core Team
 *
 * 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.
 *
 */
#ifndef _LIBRELAY_NL_H
#define _LIBRELAY_NL_H

#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <asm/types.h>
#include <linux/netlink.h>

#include <linux/netfilter_ipv4/RELAY_nlm.h>

#ifdef DEBUG_LIBIPQ
#include <stdio.h>
#define LDEBUG(x...) fprintf(stderr, ## x)
#else
#define LDEBUG(x...)
#endif	/* DEBUG_LIBIPQ */

/* FIXME: glibc sucks */
#ifndef MSG_TRUNC
#define MSG_TRUNC 0x20
#endif

struct relay_handle
{
	int fd;
	u_int8_t blocking;
	struct sockaddr_nl local;
	struct sockaddr_nl peer;
};

struct relay_handle *relay_create_handle(u_int32_t flags, u_int32_t protocol);

int relay_destroy_handle(struct relay_handle *h);

ssize_t relay_read(const struct relay_handle *h,
                unsigned char *buf, size_t len, int timeout);

int relay_set_mode(const struct relay_handle *h, u_int8_t mode, size_t len);

int relay_message_type(const unsigned char *buf);

int relay_get_msgerr(const unsigned char *buf);

int relay_ctl(const struct relay_handle *h, int request, ...);

char *relay_errstr(void);
void relay_perror(const char *s);

#endif	/* _LIBRELAY_NL_H */