LCOM1920-T02G10

/*        $NetBSD: ip_carp.h,v 1.7 2014/07/31 00:58:02 ozaki-r 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 */

} __packed;

#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

#define        CARPCTL_NAMES { \

        { 0, 0 }, \

        { "allow", CTLTYPE_INT }, \

        { "preempt", CTLTYPE_INT }, \

        { "log", CTLTYPE_INT }, \

        { "arpbalance", CTLTYPE_INT }, \

}

#ifdef _KERNEL

void                 carp_init(void);

void                 carp_ifdetach(struct ifnet *);

void                 carp_proto_input(struct mbuf *, ...);

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 *, struct rtentry *);

#endif /* _KERNEL */

#endif /* _NETINET_IP_CARP_H_ */