/*
 * 	carp.h
 * 
 * 2004 Copyright (c) Evgeniy Polyakov <johnpol@xxxxxxxxxxx>
 * All rights reserved.
 * 
 * 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 __CARP_H
#define __CARP_H

#include <linux/netdevice.h>
#include <linux/if.h>
#include <linux/ip.h>

#include "carp_ioctl.h"

#define IPPROTO_CARP 		112
#define	CARP_VERSION		2
#define CARP_TTL		255
#define	CARP_SIG_LEN		20

/*
 * carp_priv->flags definitions.
 */
#define CARP_DATA_AVAIL		(1<<0)

struct carp_header 
{
#if defined(__LITTLE_ENDIAN_BITFIELD)
	u8	carp_type:4,
		carp_version:4;
#elif defined (__BIG_ENDIAN_BITFIELD)
	u8	carp_version:4,
		carp_type:4;
#else
#error	"Please fix <asm/byteorder.h>"
#endif
	u8	carp_vhid;
	u8	carp_advskew;
	u8	carp_authlen;
	u8	carp_pad1;
	u8	carp_advbase;	
	u16	carp_cksum;
	u32	carp_counter[2];
	u8	carp_md[CARP_SIG_LEN];
};

struct carp_stat
{
	u32	crc_errors;
	u32	ver_errors;
	u32	vhid_errors;
	u32	hmac_errors;
	u32	counter_errors;

	u32	mem_errors;
	u32	xmit_errors;

	u32	bytes_sent;
};

struct carp_priv
{
	struct net_device_stats	stat;
	struct net_device	*dev, *odev;
	char 			name[IFNAMSIZ];

	int			link, mlink;
	struct iphdr		iph;

	u32			md_timeout, adv_timeout;
	struct timer_list	md_timer, adv_timer;

	enum carp_state		state;
	struct carp_header 	hdr;
	struct carp_stat	cstat;

	u8			carp_key[CARP_KEY_LEN];
	u8			carp_pad[CARP_HMAC_PAD_LEN];
	struct crypto_tfm 	*tfm;

	u64			carp_adv_counter;

	spinlock_t		lock;

	u32			flags;
	unsigned short		oflags;
};

#endif /* __CARP_H */