/*      $NetBSD: ip_carp.h,v 1.14 2021/02/03 18:13:13 roy Exp $ */
/*      $OpenBSD: ip_carp.h,v 1.18 2005/04/20 23:00:41 mpf Exp $        */

/*
* Copyright (c) 2002 Michael Shalayeff. All rights reserved.
* Copyright (c) 2003 Ryan McBride. All rights reserved.
*
* 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 AUTHOR ``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 AUTHOR OR HIS RELATIVES 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 MIND, 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 _NETINET_IP_CARP_H_
#define _NETINET_IP_CARP_H_

/*
* The CARP header layout is as follows:
*
*     0                   1                   2                   3
*     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
*    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*    |Version| Type  | VirtualHostID |    AdvSkew    |    Auth Len   |
*    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*    |   Reserved    |     AdvBase   |          Checksum             |
*    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*    |                         Counter (1)                           |
*    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*    |                         Counter (2)                           |
*    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*    |                        SHA-1 HMAC (1)                         |
*    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*    |                        SHA-1 HMAC (2)                         |
*    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*    |                        SHA-1 HMAC (3)                         |
*    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*    |                        SHA-1 HMAC (4)                         |
*    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*    |                        SHA-1 HMAC (5)                         |
*    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/

struct carp_header {
#if BYTE_ORDER == LITTLE_ENDIAN
       unsigned int    carp_type:4,
                       carp_version:4;
#endif
#if BYTE_ORDER == BIG_ENDIAN
       unsigned int    carp_version:4,
                       carp_type:4;
#endif
       u_int8_t        carp_vhid;      /* virtual host id */
       u_int8_t        carp_advskew;   /* advertisement skew */
       u_int8_t        carp_authlen;   /* size of counter+md, 32bit chunks */
       u_int8_t        carp_pad1;      /* reserved */
       u_int8_t        carp_advbase;   /* advertisement interval */
       u_int16_t       carp_cksum;
       u_int32_t       carp_counter[2];
       unsigned char   carp_md[20];    /* SHA1 HMAC */
};

#ifdef __CTASSERT
__CTASSERT(sizeof(struct carp_header) == 36);
#endif

#define CARP_DFLTTL             255

/* carp_version */
#define CARP_VERSION            2

/* carp_type */
#define CARP_ADVERTISEMENT      0x01

#define CARP_KEY_LEN            20      /* a sha1 hash of a passphrase */

/* carp_advbase */
#define CARP_DFLTINTV           1

/*
* Statistics.
*/
#define CARP_STAT_IPACKETS      0       /* total input packets, IPv4 */
#define CARP_STAT_IPACKETS6     1       /* total input packets, IPv6 */
#define CARP_STAT_BADIF         2       /* wrong interface */
#define CARP_STAT_BADTTL        3       /* TTL is not CARP_DFLTTL */
#define CARP_STAT_HDROPS        4       /* packets shorter than hdr */
#define CARP_STAT_BADSUM        5       /* bad checksum */
#define CARP_STAT_BADVER        6       /* bad (incl unsupported) version */
#define CARP_STAT_BADLEN        7       /* data length does not match */
#define CARP_STAT_BADAUTH       8       /* bad authentication */
#define CARP_STAT_BADVHID       9       /* bad VHID */
#define CARP_STAT_BADADDRS      10      /* bad address list */
#define CARP_STAT_OPACKETS      11      /* total output packets, IPv4 */
#define CARP_STAT_OPACKETS6     12      /* total output packets, IPv6 */
#define CARP_STAT_ONOMEM        13      /* no memory for an mbuf */
#define CARP_STAT_OSTATES       14      /* total state updates sent */
#define CARP_STAT_PREEMPT       15      /* in enabled, preemptions */

#define CARP_NSTATS             16

#define CARPDEVNAMSIZ   16
#ifdef IFNAMSIZ
#if CARPDEVNAMSIZ != IFNAMSIZ
#error
#endif
#endif

/*
* Configuration structure for SIOCSVH SIOCGVH
*/
struct carpreq {
       int             carpr_state;
#define CARP_STATES     "INIT", "BACKUP", "MASTER"
#define CARP_MAXSTATE   2

       char            carpr_carpdev[CARPDEVNAMSIZ];
       int             carpr_vhid;
       int             carpr_advskew;
       int             carpr_advbase;
       unsigned char   carpr_key[CARP_KEY_LEN];
};

/*
* Names for CARP sysctl objects
*/
#define CARPCTL_ALLOW           1       /* accept incoming CARP packets */
#define CARPCTL_PREEMPT         2       /* high-pri backup preemption mode */
#define CARPCTL_LOG             3       /* log bad packets */
#define CARPCTL_ARPBALANCE      4       /* balance arp responses */
#define CARPCTL_STATS           5       /* carp statistics */
#define CARPCTL_MAXID           6

#ifdef _KERNEL
void             carp_init(void);
void             carp_ifdetach(struct ifnet *);
void             carp_proto_input(struct mbuf *, int, int);
void             carp_carpdev_state(void *);
int              carp6_proto_input(struct mbuf **, int *, int);
int              carp_iamatch(struct in_ifaddr *, u_char *,
                    u_int32_t *, u_int32_t);
struct ifaddr   *carp_iamatch6(void *, struct in6_addr *);
struct ifnet    *carp_ourether(void *, struct ether_header *, u_char, int);
int              carp_input(struct mbuf *, u_int8_t *, u_int8_t *, u_int16_t);
int              carp_output(struct ifnet *, struct mbuf *,
                    const struct sockaddr *, const struct rtentry *);
#endif /* _KERNEL */
#endif /* _NETINET_IP_CARP_H_ */

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