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/* $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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